JP2024013032A - Expansion gap water leakage prevention method and expansion gap water leakage prevention structure at girder end face of concrete bridge - Google Patents

Abstract

To provide an expansion gap water leakage prevention method at a concrete bridge capable of performing construction with high accuracy and suppressing water leakage at a girder end face in a bridge axial direction.SOLUTION: An expansion gap water leakage prevention method at a girder end face of a concrete bridge comprises the steps of: forming a recessed groove 20 arranged in mutually opposed girder end faces 10a of a concrete bridge 10 adjacent in a bridge axial direction X and extending in a transverse direction Z; arranging a form member 30 having elasticity to close a gap between the girder end faces in a lower part of the recessed groove 20; and filling and curing an upper part of the form member 30 with an elastic filler 40 so that the elastic filler 40 is brought into close contact with the recessed groove 20, wherein after a guide rail 50 extending in the transverse direction Z along an expansion gap S is installed before the step of forming the recessed groove 20, a working apparatus for carrying out each work of all steps is traveled in the transverse direction Z along the guide rail 50 and conducted.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a method for preventing water leakage on the end face of a concrete bridge girder, and a structure for preventing water leakage.

Traditionally, bridges have gaps between structures such as bridge girders and deck slabs, which can be used to compensate for seasonal fluctuations in the length of each structure due to temperature changes or ground movement due to earthquakes, etc. A gap is provided to avoid damage due to collision or contact between the structures. This clearance absorbs the amount of movement of each structure due to deformation of the structure. Such spaces are generally equipped with drainage gutters and water-stopping materials to prevent rainwater from reaching the abutments and piers that support the upper structure via the spaces. In addition, the deterioration of bridge abutments, piers, etc. due to corrosion caused by rainwater, etc. is suppressed, and the life of the bridge is extended. In such a play area, an elastic water-stopping material is sometimes provided so as not to impair the function of the play area.

By the way, in bridges, deformation caused by water leakage from the gap section due to damage to the expansion and contraction device or the water stop structure of the ground covering section has become a major issue in terms of maintenance and management. Especially in winter, because it contains anti-freezing agents, there are many cases where salt damage is caused to the end faces of girders. Due to the narrow width of gaps in concrete bridges, it is currently difficult to take effective measures to prevent water leakage other than replacing expansion devices.
Here, in joints extending in the transverse direction of a concrete bridge, as shown in Patent Document 1, for example, a water guide gutter is installed at the joint, and water leakage that falls from the bridge surface via the joint is channeled into the joint. There is a known method of processing the water through the gutter material.

In addition, after inserting backup material such as sponge to close the gap that extends in the transverse direction between the end faces of girders in the axial direction of a concrete bridge, water stop material such as polybutadiene resin is used. A structure has been implemented in which water is stopped by pouring water into the gap.
Furthermore, for example, hose-shaped gutter material with a circular cross section is inserted into the gap, and the inside of the gutter material is pressurized and expanded to increase the adhesion between the end face of the girder and the gutter material, thereby achieving a water-stopping effect. .

Japanese Patent Application Publication No. 2000-064224

However, in the water leakage prevention treatment method disclosed in Patent Document 1, the distance in the transverse direction is generally 5 to 10 m, so it is difficult to accurately position the hole when drilling with a diamond core, for example. As a result, the drilling portion of the diamond core used for drilling holes was drilled in positions that were removed from the top, bottom, right and left, and there was a risk of damaging the reinforcing bars in the concrete of the girder.

In addition, when inserting backup material between gaps and placing water stop material or gutter material filled with resin, temperature shrinkage occurs repeatedly because the resin does not adhere sufficiently to the end face of the flat girder. As a result, there is a risk that the water-stopping material or gutter material may fall off, or gaps may form, leading to water leakage, so there is room for improvement in this respect.

The present invention has been made in view of the above-mentioned problems, and provides a method for preventing water leakage at the girder end face of a concrete bridge, which can be constructed with high precision and suppresses water leakage at the girder end face in the axial direction of the concrete bridge, and a water leakage prevention method at the girder end face of a concrete bridge. The purpose is to provide a prevention structure.

In order to achieve the above object, aspect 1 of the method for preventing water leakage in gaps in girder end faces of a concrete bridge according to the present invention provides water leakage in gaps extending in the transverse direction between girder end faces in the axial direction of a concrete bridge. A method for preventing free water leakage at girder end faces of a concrete bridge for preventing water leakage, the method comprising: forming grooves extending in the transverse direction in the corresponding girder end faces of concrete bridges adjacent in the bridge axis direction; A step of arranging a formwork member having elasticity in the lower part of the groove to close the gap between the girder end faces, and filling the upper part of the formwork member with an elastic filler and curing the elastic filler to form the elastic filler in the recess. and a step of bringing the guide rail into close contact with the groove, and after installing a guide rail extending in the transverse direction along the gap before the step of forming the groove, the work equipment performs each operation of all the steps. The construction is characterized in that the work is carried out by traveling in the transverse direction along the guide rail.

Aspect 9 of the water leakage prevention structure according to the present invention is a water leakage prevention structure for preventing water leakage in the space extending in the transverse direction between the girder end faces in the axial direction of a concrete bridge. a concave groove extending transversely in the corresponding girder end surfaces of concrete bridges adjacent in the axial direction; and a formwork having elasticity disposed below the concave groove and closing between the girder end surfaces. The method is characterized by comprising: a member; and an elastic filler that is filled into the upper part of the formwork member and brought into close contact with the groove in a hardened state.

In the present invention, since the guide rail can be installed in the play area at a predetermined slope, the work equipment for carrying out each process performed in the play area can be run in the transverse direction along the guide rail at a predetermined slope. . Therefore, each process performed using the work equipment can be performed accurately and efficiently.
Further, according to the present invention, the guide rail can be placed in a gap of a bridge that is narrow, for example, about 30 to 50 mm, and work can be carried out reliably using work equipment in the gap of a narrow space.

Furthermore, in the present invention, by providing grooves extending in the transverse direction on the end faces of corresponding girders of adjacent concrete bridges, the filled elastic filler can harden within the grooves and be sufficiently bonded. . Even if the gap is displaced in the axial direction of a concrete bridge due to repeated temperature contraction, the elastic filler may fall off, or gaps may form between the groove or end face of the girder and the elastic filler, resulting in water leakage. can be suppressed.

Furthermore, in the present invention, since work can be carried out only in the space between the gaps, it is possible to carry out all processes continuously from the side of the bridge. Therefore, in the present invention, construction can be carried out even when the bridge is in service without being affected by the usage time of vehicles passing over the bridge, so the degree of freedom in construction is high and an increase in the construction period can be prevented.

Aspect 2 of the present invention is the method for preventing water leakage at the girder end face of a concrete bridge according to aspect 1, in which it is preferable that a plurality of internal grooves are formed in the groove bottom of the groove when viewed in cross section. .

Moreover, in the tenth aspect of the present invention, in the floating water leakage prevention structure of the ninth aspect, it is preferable that a plurality of internal groove portions are formed in the groove bottom of the groove when viewed in cross section.

In this case, the elastic filler can be bonded more reliably within the plurality of inner grooves formed in an uneven shape at the groove bottom of the groove.

Further, according to a third aspect of the present invention, in the method for preventing water leakage at a girder end face of a concrete bridge according to the second aspect, it is preferable that the formwork member is disposed in the lowest internal groove among the internal grooves.

Moreover, in the aspect 11 of the present invention, in the free water leakage prevention structure of aspect 10, it is preferable that the form member is disposed in the lowest inner groove part of the inner groove parts.

In this case, the formwork member can be easily installed by drawing it from one side of the inner groove to the other. Therefore, a structure for attaching the formwork member is not required. Moreover, since the formwork member is fitted into the inner groove and supported, it is possible to prevent the formwork member from shifting or falling due to the load of the elastic filler filled on the formwork member. Therefore, the elastic filler can be maintained for a long period of time without falling.

Aspect 4 of the present invention is the method for preventing water leakage at the girder end face of a concrete bridge according to any one of aspects 1 to 3, wherein the guide rail has a downward slope toward at least one end of both sides in the transverse direction. It is preferable that it be installed.

In this case, by arranging the guide rail at a predetermined slope, the work equipment can travel and perform work accurately following the predetermined slope. Thereby, water can be guided to the ends in the transverse direction and treated with high precision.

Further, according to a fifth aspect of the present invention, in the method for preventing water leakage at the girder end face of a concrete bridge according to any one of aspects 1 to 4, the guide rail is supported from below by a plurality of telescopic jacks, and the guide rail is supported from below by a plurality of telescopic jacks. Preferably, the height is adjustable.

In this case, multiple telescopic jacks can be used to finely adjust the slope of the guide rail.

Further, according to an aspect 6 of the present invention, in the method for preventing water leakage at the girder end face of a concrete bridge according to any one of aspects 1 to 5, the guide rail has an upper flange with an upper surface facing upward, and Preferably, the device is provided so as to be able to travel on the upper surface of the upper flange by being pulled in the transverse direction by a traction device.

In this case, the work equipment can be moved easily and at a constant speed on the guide rail by means of the traction device.

Further, according to an aspect 7 of the present invention, in the method for preventing water leakage at the girder end face of a concrete bridge according to any one of aspects 1 to 6, the formwork member is a band-shaped rubber plate extending in the transverse direction, and the Preferably, the plate is placed in position by pulling the plate from one transverse direction of the clearance to the other.

In this case, grooves are provided on the opposing faces of the girder end faces of adjacent concrete bridges, a formwork member made of a rubber plate is inserted into the groove, and the rubber plate is easily pulled into the narrow gap to form a predetermined groove. It can be placed in any position.

Further, according to aspect 8 of the present invention, in the method for preventing water leakage at the girder end face of a concrete bridge according to any one of aspects 1 to 7, the height of the groove in the vertical direction is preferably 25 mm to 40 mm. .

In this case, the elastic filler can be sufficiently bonded within the groove.

According to the method and structure for preventing loose water leakage at the girder end face of a concrete bridge of the present invention, construction can be performed with high precision, and water leakage at the girder end face in the bridge axis direction of a concrete bridge can be suppressed.

It is a side view seen from the bridge axis direction showing the construction state of the water leak prevention structure according to the embodiment of the present invention. FIG. 3 is a partial cross-sectional view of the water leakage prevention structure viewed from the transverse direction. It is a sectional view showing a structure for preventing water leakage in a play area. FIG. 3 is a cross-sectional view showing a surface treatment step of a method for preventing water leakage. It is a construction flow diagram of a method for preventing water leakage. It is a side view of the 1st working equipment used for the idle water leakage prevention method. FIG. 7 is a front view of the first working device used in the method for preventing water leakage shown in FIG. 6; It is a side view of the 2nd working equipment used for the idle water leakage prevention method. It is a side view of the 3rd work equipment used for the idle water leakage prevention method. It is a side view of the 4th work equipment used for the idle water leakage prevention method. FIG. 2 is a cross-sectional view showing a method for preventing water leakage. It is a longitudinal cross-sectional view which shows the end pawl form installation process of the water leakage prevention method.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for preventing water leakage at the end face of a concrete bridge according to an embodiment of the present invention and a structure for preventing water leakage will be described based on the drawings.

As shown in FIGS. 1 and 2, the water leakage prevention method of the present embodiment prevents water leakage in the space S extending along the transverse direction Z between the girder end faces 10a in the bridge axis direction X of the concrete bridge 10. A water leakage prevention structure 1 is constructed to prevent water leakage.

Here, in the concrete bridge 10 shown in FIG. 1, the reference numeral 11 indicates a substructure, and the reference numeral 12 indicates a deck slab.
The gap S of the concrete bridge 10 is an elongated groove-shaped gap extending in the transverse direction Z, and its end surface (girder end surface 10a) appears on the side surface of the concrete bridge 10. The length direction of the play space S is the transverse direction Z. The dimension of the play space S in the bridge axis direction X (play space width) is, for example, 50 mm or more. Leak water W (arrow shown in FIG. 2) flowing through the play area S is discharged to one side in the transverse direction Z through the play area water leak prevention structure 1.

As shown in FIG. 3, the space leakage prevention structure 1 is provided in the space S between the concrete bridges 10. The leakage prevention structure 1 includes grooves 20 (20A, 20B) formed in mutually opposing girder end faces 10a of concrete bridges 10 (10A, 10B) adjacent in the bridge axis direction X and extending in the transverse direction Z; A formwork material 30 is arranged at the bottom of the groove 20 and has elasticity to block the free space S so as to divide it in the vertical direction Y. and an elastic filler 40.

The grooves 20A and 20B on both the left and right sides with the play space S in between have the same substantially rectangular cross-sectional shape, and face each other in the bridge axis direction X. That is, the position in the height direction of the groove 20A of one concrete bridge 10A is the same as the position in the height direction of the groove 20B of the other concrete bridge 10B.

The groove bottom 20a of the groove 20 is formed with a plurality of stages (here, three stages) of internal groove portions 21 (21A, 21B, 21C) arranged in the vertical direction Y when viewed in cross section. The inner groove portions 21A, 21B, and 21C each extend in the transverse direction Z. A formwork member 30 (formwork member) made of a rubber plate extending in the transverse direction Z is arranged in the inner groove portion 21A at the lowest stage. The groove depth of the groove 20 (the depth from the girder end face 10a to the bottom of the inner groove portion 21) is, for example, 8 to 12 mm. The height of the groove 20 in the vertical direction Y (corresponding to the groove width) is, for example, 25 mm to 40 mm. Further, the height (corresponding to the groove width) of each of the inner groove portions 21A, 21B, and 21C is set to, for example, about 10 mm.
The groove 20 and the inner groove 21 are constructed by using a first working device 61 shown in FIG. 4 .

The formwork material 30 has a band shape extending in the transverse direction Z. The thickness of the formwork material 30 is, for example, approximately the same size as the height of the inner groove portion 21, and is, for example, about 10 mm. As described above, the formwork material 30 has elasticity that allows it to be elastically deformed at least in the width direction (in the bridge axis direction X in the installed state). The formwork material 30 is disposed in the groove 20 by engaging both rubber side edges 30b in the width direction with the inner groove 21A at the lowermost stage of the groove 20. The formwork material 30 functions as a lower formwork for the elastic filler 40 that is filled after the formwork material 30 is installed, and also has the function of preventing the elastic filler 40 from falling off after hardening. Therefore, the formwork material 30 remains in the gap S even after the elastic filler 40 is filled and hardened, thereby forming the gap water leakage prevention structure 1.
The formwork material 30 is constructed by using a fourth working device 64 (see FIG. 10), which will be described later.

The elastic filler 40 is filled on the formwork material 30 of the play space S, and is also filled in the pair of opposing grooves 20. The elastic filler 40 is made of, for example, a material such as a silicone resin that can be elastically deformed according to the amount of expansion and contraction associated with a temperature change of the concrete bridge 10 after hardening. The elastic filler 40 is preferably a material that undergoes a curing reaction after being filled into the upper surface of the mold material 30 serving as the mold.

The filling height of the elastic filler 40 from the formwork material 30 (height of the upper surface 40a) is approximately the same level as the upper end 20b of the groove 20, but is higher than the level of the upper end 20b of the groove 20 (Fig. 3) or a lower level. In short, it is sufficient that the elastic filler 40 is filled in a state in which it is in contact with at least a portion of the groove bottom 20a of the groove 20 of the elastic filler 40.
The elastic filler 40 is applied by using a fifth working device (not shown) which will be described later.

Next, the construction procedure of the method for preventing water leakage in the girder end face 10a of the concrete bridge 10 described above will be explained in detail with reference to FIG. 5 and the like.

As shown in FIGS. 1 and 4, the method for preventing water leakage in the present embodiment is to construct a water leakage prevention structure 1 serving as a new water guide gutter in the space S of a narrow concrete bridge 10, and to prevent traffic on the bridge. In order to carry out construction from the substructure side without implementing regulations, guide rails 50 are used for construction. That is, first, in step S1, a guide rail 50 is installed in the play space S from the girder end face 10a, and the guide rail 50 is adjusted to the height and slope of the play space leakage prevention structure 1 to be constructed. After that, in each operation of all processes (steps S2 to S7), various construction machines (work equipment 60) are mounted on the guide rail 50, and the work equipment 60 is run in the transverse direction Z on the guide rail 50. The construction will be carried out after the construction is completed.
Note that, in consideration of the performance of the working equipment 60, the water leakage prevention method of the present embodiment is applicable to concrete bridges 10 having a gap width of 50 mm or more, for example. As an example, a concrete bridge with a clearance width of 50 mm or more is used, but it is of course possible to construct a concrete bridge with a clearance width of less than 50 mm if conditions such as the size, performance, construction method, etc. of the work equipment 60 are satisfied. be.

The method for preventing free water leakage includes the steps of forming grooves 20 that are arranged on mutually opposing girder end faces 10a of concrete bridges 10 adjacent in the bridge axis direction X and extending in the transverse direction Z; , a step of arranging a formwork material 30 having elasticity to block the play space S in the vertical direction Y, and filling the upper part of the formwork material 30 with the elastic filler material 40 and curing it. and a step of bringing it into close contact with the groove 20.

As shown in FIGS. 1 and 4, in the guide rail installation work of step S1, the guide rails 50 manufactured to a constant length of, for example, 1.0 m or 2.0 m are connected in series, thereby increasing the clearance of the play area S. It can be installed according to the length in the transverse direction Z.

The guide rail 50 is installed with a downward slope toward at least one end of both sides in the transverse direction Z. The slope of the guide rail 50 is set to, for example, about 2.0%. The guide rail 50 is made of H-shaped steel or I-shaped steel having an upper flange 50A with an upper surface 50a facing upward.

The guide rail 50 is supported from below by a plurality of (four in FIG. 1) telescopic jacks 51 arranged at intervals along the transverse direction Z, and is installed at a predetermined height and a predetermined slope. The height of the guide rail 50 can be adjusted by extending and contracting each of the plurality of telescopic jacks 51. Specifically, when the telescopic jack 51 is a hydraulic jack, the height (gradient) can be finely adjusted remotely by attaching the telescopic jack 51 to the upper surface 11a of the substructure 11 and operating the telescopic jack 51 with a hydraulic pump. making it possible. Note that the number of telescopic jacks 51, the type of jacks, etc. can be set arbitrarily.

The work equipment 60 is pulled in the transverse direction Z by the traction device 52 and is provided so as to be able to run on the upper surface 50a of the upper flange 50A of the guide rail 50. As the work equipment 60, devices having different functions are used for each work in the process described below.

As shown in FIG. 1, the traction device 52 has a wire 53 that can be unwound and wound up, and is installed at respective positions on the upper surface 11a of the substructure 11 on both outer sides of the play space S in the transverse direction Z. The traction device 52 has a wire 53 that can be unwound and wound up for guiding the work equipment 60 along the guide rail 50. The wire 53 is provided so as to be movable above the guide rail 50 in the transverse direction Z. The working device 60 is connected to the tip 53a of the wire 53. When the work equipment 60 travels from the starting point P1 (left side in FIG. 1) to the ending point P2 (right side in FIG. 1), the wire 53 is wound up by the first traction device 52A disposed at the ending point P2. When returning the work equipment 60 from the end point P2 (right side in FIG. 1) to the starting point P1 (left side in FIG. 1), the wire 53 is wound up by the second traction device 52B disposed at the starting point P1.

When two traction devices 52A and 52B are installed at the starting point P1 and the ending point P2 as in this embodiment, the work equipment 60 can be run in either direction to perform the work.
In addition, when the work of each process is performed by running the work equipment 60 only in one direction of the transverse direction Z, a configuration may be adopted in which, for example, one traction device 52 is provided only at the end point P2.

When installing the guide rail 50, consider the slope in the transverse direction Z, and set the position of the upper surface 50a of the guide rail 50 at the starting point P1 and the ending point P2, and the three-stage inner groove portions 21A, 21B, 21C ( Perform a marking process to mark the cutting position (see Figure 3).

In this manner, in the guide rail installation work of step S1, the protrusion of the guide rail 50 and the fixing position of the telescopic jack 51 at the starting point P1 and the ending point P2 are determined. Then, the telescopic jack 51 is fixed at a predetermined position and inserted into the play space S from one side in the transverse direction Z while connecting the plurality of guide rails 50. When the insertion of the guide rail 50 into the play space S is completed, the height is adjusted using a telescopic jack 51 and a laser level.

Next, as shown in FIGS. 4, 6, and 7, in step S2, a surface treatment process is performed to form the grooves 20. In the surface treatment process, a first working device 61 is used as the working device 60, which is equipped with three cutting blades 616 (616A, 616B, 616C) that rotate using air as power. That is, the first working device 61 is mounted on the upper flange 50A of the guide rail 50, and is caused to travel in the transverse direction Z from the starting point P1 to the ending point P2 while rotating the cutting blade 616.

The first work equipment 61 includes a base 611, a pedestal 612 fixed to the base 611, a sander 613 supported by the base 611 and the pedestal 612, and a suction recovery unit 614 that sucks concrete cutting shear cut by the sander 613. , is provided. The base 611 has a flat plate shape and is slidably mounted on the upper surface 50a of the upper flange 50A of the guide rail 50. The width dimension (length dimension in the bridge axis direction X) of the base 611 is set smaller than the dimension of the play space S in the bridge axis direction X. A trestle 612 is framed on the base 611.

As shown in FIG. 6, the sander 613 includes a rotating shaft 615 and three disk-shaped cutting blades 616 (616A, 616B, 616C) that are coaxially supported by the rotating shaft 615 and stacked in the axial direction. have The rotation shaft 615 is arranged with its axial direction perpendicular to the upper surface 611a of the base 611. The first work equipment 61 is installed so that the rotating shaft 615 is located at the center of the play space S in the bridge axis direction X.

The sander 613 is fixed on the base 611, and the upper end 615a of the rotating shaft 615 is rotatably supported on the pedestal 612. The cutting blade 616 supported by the rotating shaft 615 is made of, for example, a diamond wheel. The outer diameter of the cutting blade 616 corresponds to the distance between the groove bottoms 20a of a pair of opposing grooves 20 formed in the clearance S (see FIG. 4). By rotating the cutting blade 616 and causing the first working device 61 to run on the guide rail 50 in the transverse direction Z, the pair of grooves 20 are formed with the same groove depth. By changing the outer diameter of the cutting blade 616, construction with a gap width of up to 100 mm is possible, for example.
The thickness of one cutting edge 616 corresponds to the height dimension of the inner groove portion 21 of the groove 20 formed on the end face 10a of the girder. In other words, the three stacked cutting blades 616 form the groove 20 having the three inner grooves 21.

The suction recovery unit 614 is a suction port that sucks the concrete cutting shear of the girder end face 10a cut by the cutting blade 616 during the work of forming the groove 20. The suction recovery section 614 is connected to a vacuum (not shown) with a hose 614A.

In the first working device 61, first, the lower inner groove portion 21A is formed by cutting only with the lower cutting blade 616A, and then the middle cutting blade 616B is laminated on the lower cutting blade 616A. The middle inner groove 21B is formed by cutting, and finally the upper cutting blade 616C is laminated on the middle cutting blade 616B, and the upper inner groove 21C is formed (see FIG. 3). When cutting with the middle cutting blade 616B, the lower cutting blade 616A is guided to the previously formed lower inner groove 21A, so that the cutting can be performed with higher precision. At this time, as shown in FIG. 1, the first work equipment 61 installed on the guide rail 50 runs on the guide rail 50 at a constant speed by winding the wire 53 with the traction device 52, so that the first work equipment 61 installed on the guide rail 50 runs at a constant speed. A pair of grooves 20 having three stages of internal grooves 21A, 21B, and 21C can be formed uniformly and satisfactorily.
In the first working device 61, by simultaneously rotating three cutting blades 616 and running them on the guide rail 50, it is possible to cut the grooves 20A and 20B on both the left and right sides of the girder end face 10a at once. It is.

Next, as shown in FIG. 8, in the cleaning process of step S3, cleaning is performed using the second working device 62 to remove cutting shears, slag water, etc. that have adhered to the inside of the groove 20 cut in step S2. It is something.

The second working device 62 includes a base 621 and a cleaning nozzle 622 supported on the base 621 and having a spout 622A. The base 621 has a flat plate shape and is slidably mounted on the upper surface 50a of the upper flange 50A of the guide rail 50. The width dimension (length dimension in the bridge axis direction X) of the base 621 is set smaller than the dimension of the play space S in the bridge axis direction X. During the cleaning process, the second working device 62 is arranged on the guide rail 50 with the spout 622A of the cleaning nozzle 622 facing the traveling direction (transverse direction Z).

In the cleaning process, the second work equipment 62 is placed on the guide rail 50, and the second work equipment is moved using the traction device 52 (see FIG. 1) while jetting water at high pressure from the spout 622A of the cleaning nozzle 622. 62 from the starting point P1 to the ending point P2, the opposing girder end surfaces 10a including the grooves 20 are cleaned by high-pressure water.

Next, as shown in FIG. 9, in the primer application step of step S4, a primer is applied to the groove 20 cleaned in step S3 using the third working device 63.

The third working device 63 includes a base 631 , a coating spray gun 632 supported on the base 631 , and a primer pressure pump (not shown) that pumps the primer toward the spray gun 632 . The base 631 has a flat plate shape and is slidably mounted on the upper surface 50a of the upper flange 50A of the guide rail 50. The width dimension (length dimension in the bridge axis direction X) of the base 631 is set smaller than the dimension of the play space S in the bridge axis direction X. The spray gun 632 has an injection port 632A that sprays the primer, and a supply port 632B to which a hose connected to a primer pressure pump is connected. The third working device 63 is arranged on the guide rail 50 with the injection port 632A of the spray gun 632 facing the end point P2 in the traveling direction (transverse direction Z) when applying the primer.

In the primer application process, after drying and curing in the cleaning process of step S3, the third working device 63 is placed on the guide rail 50, and the traction device 52 (see FIG. 1) is sprayed with primer from the injection port 632A of the spray gun 632. ) by moving the third working device 63 from the starting point P1 to the ending point P2, the primer is applied to the opposing girder end faces 10a including the grooves 20.

Next, as shown in FIGS. 10 and 11, in the formwork material installation process of step S5, the formwork material 30 is installed in the groove 20 coated with the primer in step S4 using the fourth working device 64. do. In the formwork material installation work that installs the formwork material 30, the fourth work device 64 placed on the guide rail 50 grasps the formwork material tip 30a of the formwork material 30, and in this grip state, the fourth work is carried out. By moving the device 64 toward the end point P2, the formwork material 30 is drawn into and placed in the lower inner groove portion 21A of the groove 20. The purpose of installing the formwork material 30 is to function as a bottom formwork for filling the elastic filler 40 in a subsequent process and to prevent the filled elastic filler 40 from falling off after hardening.

The fourth working device 64 includes a base 641 movably supported by the upper flange 50A of the guide rail 50, and a form material gripping part 642 supported on the base 641. The base 641 has a flat plate shape and is slidably mounted on the upper surface 50a of the upper flange 50A of the guide rail 50. The base 641 is provided with a locking groove 641a that locks the upper flange 50A from both sides in the width direction. The width dimension (length dimension in the bridge axis direction X) of the base 641 is set smaller than the dimension of the play space S in the bridge axis direction X.

The form material gripping part 642 includes a lower pedestal 642A and an upper pressing piece 642B that presses the lower pedestal 642A from above with the form material tip 30a of the form material 30 interposed therebetween. The upper holding piece 642B is removably fixed to the lower pedestal 642A with a bolt. The formwork material gripping part 642 is provided so that the positions of the rubber side edges 30b at both ends in the width direction of the formwork material 30 held therein are at a height facing the inner groove part 21A at the lowest stage of the concave groove 20. The formwork material 30 held by the formwork material gripping part 642 is pulled into the play space S and installed with the formwork material tip 30a fixed to the formwork material gripping part 642.

In the formwork material installation process, after the primer application process in step S4, the fourth working device 64 is placed on the guide rail 50 and pulled while the formwork material tip 30a is gripped by the formwork material gripping section 642. The formwork material 30 is drawn into the play space S and installed by moving the fourth working device 64 from the starting point P1 to the ending point P2 using the device 52 (see FIG. 1). Thereafter, the formwork material 30 is cut at a position protruding from the free space S by, for example, about 10 cm, and the upper holding piece 642B is removed from the lower pedestal 642A at the formwork material grip part 642 to release the formwork material tip 30a. The formwork material 30 released from the formwork material gripping part 642 is fixed at a predetermined position in the concave groove 20 by the rubber side edges 30b on both left and right sides fitting into the inner groove part 21 of the concave groove 20. Ru.

Next, as shown in FIG. 12, in the end pawl frame installation process of step S6, pawl frame members 31 are installed at both ends in the transverse direction Z of the elastic filler 40 that will be filled in the subsequent process (step S7). . The toe frame material 31 is made of, for example, a thin iron plate or the like in accordance with the shape of the concrete bridge 10, the cross-sectional shape of the gap S, and the width of the gap. The toe frame material 31 is used when filling the elastic filler 40, and is removed after construction.

Next, as shown in FIG. 3, in the filling process of step S7, the formwork material 30 installed in step S5 and the pawl formwork material installed in step S6 using the fifth work equipment (not shown). 31 (see FIG. 12) is used as a mold and filled with an elastic filler 40. The fifth work equipment is moved in the transverse direction Z on the formwork material 30 installed on the guide rail 50, thereby moving the elastic filler material 40 into the filling area surrounded by the formwork material 30 and the pawl formwork material 31. Fill area R.

The fifth working device is a frame-shaped member having a filling and discharging portion at one end, and is provided so as to be movable on the formwork material 30 by a traction device 52 shown in FIG. The filling outlet is connected by a hose to a filling pump located outside the filling area. The filling pump is provided with a hopper. The filling and discharging section discharges the elastic filler 40 that is pressure-fed from the filling pump. The filling pump supplies the elastic filler 40, such as silicone resin, whose blending ratio has been confirmed and the base resin and curing agent are stirred using a stirrer, to a hopper, and pumps it to the filling and discharging section of the fifth working device.

In the filling process, after the end pawl form installation process of step S6, a fifth working device (not shown) is placed on the guide rail 50 (on the form material 30). Thereafter, the fifth work equipment is moved from the starting point P1 to the ending point P2 using the traction device 52 while the elastic filler 40 that has been pressure-fed from the filling pump is discharged from the filling and discharging section. The filling region R above the elastic filler 40 is filled with the elastic filler 40 . At this time, for example, by providing a micro camera or the like in the filling and discharging section of the fifth working device, it is possible to adjust the moving speed of the traction device 52 while checking the discharging situation and the filling situation. The filling height of the elastic filler 40 (height to the upper surface 40a) can be set as appropriate, but it is set to a height at least such that the groove 20 is filled with the elastic filler 40. In this embodiment, as shown in FIG. 3, the elastic filler 40 is filled up to a position above the groove 20. Thereby, by filling the groove 20 with the elastic filler 40, sufficient adhesive strength and shearing performance can be obtained, and the elastic filler 40 can be prevented from falling off.

Thereafter, in step S8, after the elastic filler 40 filled in the filling region R is hardened and cured, the toe frame material 31 and the guide rail 50 are removed. Specifically, the pressure is removed from the telescopic jack 51 for rail height adjustment, the cylinder is lowered, and the guide rail 50 is pulled out from the play space S while being dismantled.
Through the above steps, construction of the water leakage prevention structure 1 is completed.
In addition, after constructing the interleaving water leakage prevention structure 1, an end-of-stream drainage treatment work is constructed in which a drain pipe and a water collection basin connected to the interleaving water leakage prevention structure 1 are installed, but a detailed explanation will be omitted here.

Next, the operation of the above-described method for preventing water leakage at the girder end face of a concrete bridge will be explained in detail based on the drawings.
The method for preventing water leakage in gaps in the girder end faces 10a of a concrete bridge according to the present embodiment is for preventing water leakage in gaps S extending along the transverse direction Z between the girder end faces 10a in the bridge axis direction X of the concrete bridge 10. This is a method for preventing water leakage at the girder end face 10a of a concrete bridge. A process of forming grooves 20 extending in the transverse direction Z on mutually opposing girder end faces 10a of concrete bridges 10 adjacent in the bridge axis direction a process of arranging a formwork material 30 having elasticity to close the formwork material 30; and a process of bringing the elastic filler material 40 into close contact with the groove 20 by filling and hardening the elastic filler material 40 in the upper part of the formwork material 30. . After installing a guide rail 50 extending in the transverse direction Z along the free space S before the process of forming the groove 20, work equipment 60 for performing each work in all processes is installed in the transverse direction along the guide rail 50. Run to Z and perform construction. As a result, the guide rail 50 can be installed in the play area S at a predetermined slope, so that the work equipment 60 for carrying out each process performed in the play area S can be moved along the guide rail 50 at a predetermined slope. It can be made to travel in the transverse direction Z. Therefore, each process performed using the work equipment 60 can be performed accurately and efficiently. In this embodiment, the guide rail 50 can be placed in a gap S of a bridge that is narrow, for example, by about 30 to 50 mm, and work can be performed reliably using the work equipment 60 in the narrow gap S of the bridge. Can be done.

Furthermore, in this embodiment, by providing grooves 20 extending in the transverse direction Z in the corresponding girder end faces 10a of adjacent concrete bridges 10, the filled elastic filler 40 hardens within the grooves 20. It can be fully adhered. Furthermore, since the elastic filler 40 after filling has elasticity and is supported from below by the formwork material 30, the clearance S will be displaced in the bridge axis direction X as the concrete bridge 10 repeatedly experiences temperature contraction. Even if the elastic filler 40 falls off or a gap is generated between the groove 20 and the end face 10a of the girder and the elastic filler 40, water leakage can be suppressed.

Furthermore, in this embodiment, since the work can be carried out only in the space of the play area S, it is possible to carry out all the steps continuously from the side of the bridge. Therefore, in this embodiment, construction can be carried out even when the bridge is in service without being affected by the usage time of vehicles passing over the bridge, so the degree of freedom in construction is high and it is possible to prevent an increase in the construction period.

Furthermore, in this embodiment, a plurality of internal groove portions 21 are formed in the groove bottom 20a of the groove 20 when viewed in cross section. Therefore, the elastic filler 40 can be bonded more reliably within the plurality of inner groove portions 21 formed in an uneven shape on the groove bottom 20a of the groove 20.

Moreover, in this embodiment, the formwork material 30 is arranged in the lowest inner groove part 21A of the inner groove parts 21. Thereby, the formwork material 30 can be easily installed by drawing it from one side of the inner groove part 21A to the other side. Therefore, a structure for attaching the formwork material 30 is not required. Moreover, since the formwork material 30 is fitted into and supported by the inner groove 21A, the formwork material 30 is prevented from shifting or falling due to the load of the elastic filler 40 filled on the formwork material 30. can. Therefore, the elastic filler 40 can be maintained for a long period of time without falling.

Further, in this embodiment, the guide rail 50 is installed with a downward slope toward at least one end of both sides in the transverse direction Z. In this case, by arranging the guide rail 50 at a predetermined slope, the work equipment 60 can travel and work with high accuracy following the predetermined slope. Thereby, water can be guided to the end in the transverse direction Z and treated with high precision.

Further, in this embodiment, the guide rail 50 is supported from below by a plurality of telescopic jacks 51, and is provided so that its height can be adjusted by the telescopic jacks 51. In this case, the slope of the guide rail 50 can be finely adjusted using a plurality of telescopic jacks 51.

Further, in this embodiment, the guide rail 50 has an upper flange 50A with an upper surface 50a facing upward. The work equipment 60 is provided so as to be able to run on the upper surface 50a of the upper flange 50A by being pulled in the transverse direction Z by the traction device 52. In this case, the work equipment 60 can be easily moved on the guide rail 50 at a constant speed by the traction device 52.

Moreover, in this embodiment, the formwork member is a band-shaped formwork member 30 extending in the transverse direction Z. The formwork material 30 is placed in a predetermined position by being drawn in from one side of the space S in the transverse direction Z to the other. In this case, a concave groove 20 is provided on the opposing surface of the girder end surface 10a of the adjacent concrete bridge 10, the formwork material 30 is inserted here, and the formwork material 30 can be easily drawn into the narrow clearance S. , can be placed in a predetermined position. Therefore, a concave groove 20 is provided on the opposing surface of the girder end surface 10a of the adjacent concrete bridge 10, the formwork material 30 is inserted here, and the formwork material 30 is easily drawn into the narrow clearance S, and the predetermined It can be placed in any position.

As described above, the method for preventing loose water leakage at the girder end face of a concrete bridge according to the present embodiment can be performed with high precision, and water leakage at the girder end face 10a in the bridge axis direction X of the concrete bridge 10 can be suppressed.

The embodiments of the method for preventing water leakage at the girder end faces of concrete bridges according to the present invention have been described above, but the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit thereof. .

For example, in the embodiment described above, the groove bottom 20a of the concave groove 20 has a plurality of stages of inner groove portions 21 formed in a cross-sectional view, but it is also possible to omit the plurality of inner groove portions 21.
Further, the number of stages of the inner groove portion 21 is not limited to three stages as in this embodiment, but can be increased or decreased. For example, it is possible to reduce the number of stages to two, or to increase it to four or more stages.
Furthermore, in the embodiment described above, the number of cutting blades 616 of the sander 613 for forming the inner groove portion 21 is three, but the number of cutting blades is not particularly limited and can be changed as appropriate. In other words, the number of cutting blades may be two, or the sander may have four or more cutting blades.

In this embodiment, the formwork member 30 (formwork member) is arranged in the inner groove part 21A at the lowest stage among the inner groove parts 21, but the formwork member 30 may not be arranged in the inner groove part 21A.

In this embodiment, the guide rail 50 is supported from below by a plurality of telescoping jacks 51, and the height of the guide rail 50 is adjustable by the telescoping jacks 51. It is not limited to adjusting.

The shape of the guide rail 50 is not limited to the above embodiment. That is, the guide rail 50 is not limited to having the upper flange 50A with the upper surface 50a facing upward.

In this embodiment, the formwork material 30 made of a band-shaped rubber plate extending in the transverse direction is employed as the formwork member, but the formwork material 30 is not limited to the rubber plate, and other members are used as the formwork member. You can also use it as

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention.

1 Water leakage prevention structure 10, 10A, 10B Concrete bridge 10a Girder end face 20, 20A, 20B Groove 20a Groove bottom 21 Inner groove 30 Formwork material (formwork member)
31 Toe frame material 40 Elastic filler 50 Guide rail 50A Upper flange 50a Upper surface 51 Telescopic jack 52 Traction device 53 Wire 60 Work equipment 61 1st work equipment 62 2nd work equipment 63 3rd work equipment 64 4th work equipment R Filling Area S Clearance X Bridge axis direction Y Vertical direction Z Transverse direction

In order to achieve the above object, aspect 1 of the method for preventing water leakage in gaps in girder end faces of a concrete bridge according to the present invention provides water leakage in gaps extending in the transverse direction between girder end faces in the axial direction of a concrete bridge. A method for preventing free water leakage at girder end faces of a concrete bridge for preventing water leakage, the method comprising: forming grooves extending in the transverse direction in the corresponding girder end faces of concrete bridges adjacent in the bridge axis direction; A step of arranging a formwork member having elasticity in the lower part of the groove to close the gap between the girder end faces, and filling the upper part of the formwork member with an elastic filler and curing the elastic filler to form the elastic filler in the recess. and a step of bringing the guide rail into close contact with the groove, and after installing a guide rail extending in the transverse direction along the gap before the step of forming the groove, the work equipment performs each operation of all the steps. The groove is constructed by running in a transverse direction along the guide rail, and the groove bottom of the groove has a plurality of internal grooves formed in a cross-sectional view .

Aspect 8 of the play water leakage prevention structure according to the present invention is a play water leakage prevention structure for preventing water leakage in the play space extending along the transverse direction between the girder end faces in the axial direction of a concrete bridge. a concave groove extending transversely in the corresponding girder end surfaces of concrete bridges adjacent in the axial direction; and a formwork having elasticity disposed below the concave groove and closing between the girder end surfaces. and an elastic filler filled in the upper part of the formwork member and brought into close contact with the groove in a hardened state , and the groove bottom of the groove has a plurality of internal grooves when viewed in cross section. It is characterized by the formation of

Moreover, in this case, the elastic filler can be bonded more reliably within the plurality of inner grooves formed in an uneven shape at the groove bottom of the groove.

Further, according to a second aspect of the present invention, in the method for preventing water leakage at a girder end face of a concrete bridge according to aspect 1 , it is preferable that the formwork member is disposed in the lowest inner groove among the inner grooves.

Moreover, in the aspect 9 of the present invention, in the floating water leakage prevention structure of aspect 8 , it is preferable that the form member is disposed in the lowest inner groove among the inner grooves.

Aspect 3 of the present invention is the method for preventing water leakage at a girder end face of a concrete bridge according to aspect 1 or 2 , wherein the guide rail is installed with a downward slope toward at least one end of both sides in the transverse direction. It is preferable.

Further, according to an aspect 4 of the present invention, in the method for preventing water leakage at a girder end face of a concrete bridge according to any one of aspects 1 to 3 , the guide rail is supported from below by a plurality of telescoping jacks, and the guide rail is supported from below by a plurality of telescoping jacks. Preferably, the height is adjustable.

Further, according to an aspect 5 of the present invention, in the method for preventing water leakage at the girder end face of a concrete bridge according to any one of aspects 1 to 4 , the guide rail has an upper flange with an upper surface facing upward, and Preferably, the device is provided so as to be able to travel on the upper surface of the upper flange by being pulled in the transverse direction by a traction device.

Further, according to an aspect 6 of the present invention, in the method for preventing water leakage at the girder end face of a concrete bridge according to any one of aspects 1 to 5 , the formwork member is a band-shaped rubber plate extending in the transverse direction, and the Preferably, the plate is placed in position by pulling the plate from one transverse direction of the clearance to the other.

Aspect 7 of the present invention is the method for preventing water leakage at the girder end face of a concrete bridge according to any one of aspects 1 to 6 , wherein the height of the groove in the vertical direction is preferably 25 mm to 40 mm. .

Claims (11)

A method for preventing water leakage in gaps extending in the transverse direction between girder end surfaces in the axial direction of a concrete bridge, the method comprising:
forming grooves extending in the transverse direction and arranged on the mutually opposing girder end faces of concrete bridges adjacent in the bridge axis direction;
arranging a formwork member having elasticity that is disposed at the bottom of the groove and closes the free space so as to divide it in the vertical direction;
filling the upper part of the formwork member with an elastic filler and curing it to bring the elastic filler into close contact with the groove;
After installing a guide rail extending in the transverse direction along the clearance before the step of forming the groove, work equipment for performing each work in all the steps is run in the transverse direction along the guide rail. A method for preventing water leakage at the end face of a girder of a concrete bridge that is constructed in parallel. 2. The method for preventing water leakage in a girder end face of a concrete bridge according to claim 1, wherein a plurality of internal grooves are formed in the groove bottom of the groove when viewed in cross section. The method for preventing water leakage in a girder end face of a concrete bridge according to claim 2, wherein the formwork member is arranged in the lowest inner groove of the inner grooves. The method for preventing water leakage at a girder end face of a concrete bridge according to claim 1, wherein the guide rail is installed with a downward slope toward at least one end of both sides in the transverse direction. The method for preventing water leakage at a girder end face of a concrete bridge according to claim 1 or 4, wherein the guide rail is supported from below by a plurality of telescoping jacks, and the height is adjustable by the telescoping jacks. The guide rail has an upper flange with an upper surface facing upward,
The method for preventing water leakage at a girder end face of a concrete bridge according to claim 1, wherein the working equipment is provided so as to be able to travel on the upper surface of the upper flange by being pulled in a transverse direction by a traction device. The formwork member is a band-shaped rubber plate extending in the transverse direction,
3. The method for preventing water leakage at a girder end face of a concrete bridge according to claim 1 or 2, wherein the rubber plate is placed at a predetermined position by pulling the rubber plate from one side of the gap in a transverse direction to the other. The method for preventing water leakage in a girder end face of a concrete bridge according to claim 1, wherein the height of the groove in the vertical direction is 25 mm to 40 mm. A gap leakage prevention structure for preventing water leakage in a gap extending in the transverse direction between girder end faces in the axial direction of a concrete bridge,
a groove extending in the transverse direction in the mutually corresponding girder end faces of concrete bridges adjacent in the bridge axis direction;
a formwork member disposed below the groove and having elasticity to close the gap between the girder end faces;
An elastic filler that is filled into the upper part of the formwork member and brought into close contact with the groove in a hardened state. 10. The water leakage prevention structure according to claim 9, wherein a plurality of internal grooves are formed in the groove bottom of the groove when viewed in cross section. The water leakage prevention structure according to claim 10, wherein the form member is disposed in the lowest inner groove among the inner grooves.

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