JP6134346B2 - Sheet pile co-falling prevention device and sheet pile construction method - Google Patents

Description

  The present invention engages with a sheet pile being driven or pulled out when a sheet pile such as a steel sheet pile, a steel pipe sheet pile, a prestressed concrete (PC) sheet pile is driven into the ground, or when a sheet pile is pulled out from the ground. The present invention relates to a co-falling prevention device for preventing an adjacent sheet pile from following, and a method of constructing a sheet pile using the same.

  Steel sheet piles, steel pipe sheet piles, PC sheet piles, and other sheet piles with joints that engage with each other are substructures such as earth retaining works, water stop works, permanent piles, etc. (Patent Documents 1, 2, etc.). In the following description of the prior art, a steel sheet pile will be mainly described as an example of a sheet pile with a joint, but the same applies to other sheet piles.

  FIG. 16 is a schematic view for illustrating a conventional steel sheet pile construction method. Among the steel sheet pile groups in which the joints are engaged with each other, reference numeral P5 is assigned to the steel sheet pile being driven, and reference signs P1 to P4 are assigned to the four existing steel sheet piles adjacent to the steel sheet pile P5 in the driving order. (The same applies to the following similar figures). The ground surface is indicated by the symbol G, and the top ends of the existing steel sheet piles P1 to P4 are indicated by the symbol h. The steel sheet pile P5 is gripped by the pile driving machine 100 suspended from the crane and driven into the ground.

  When the steel sheet pile P5 is driven into the ground, sand or the like clogged in the joint of the adjacent steel sheet pile P4 is driven while being pushed down by the joint of the next steel sheet pile P5, but there is no escape place for sand or the like. Joint resistance is generated by the internal friction angle of sand and the wedge effect. In addition, since the earth pressure acting on the steel sheet pile P5 increases as the depth increases, the lower end of the steel sheet pile P5 is pushed down, and the joint resistance force is also exerted when the steel sheet pile P5 is tilted (tilted forward) in the construction progress direction. Will increase. Further, since the steel sheet pile joints have a predetermined degree of freedom so that adjacent steel sheet piles can form a predetermined angle, the rotational force around the vertical axis acts on the steel sheet pile P5 being driven. The joint resistance increases. Due to such an increase in joint resistance, a co-falling phenomenon occurs in which the existing steel sheet pile P4 is pulled down following the steel sheet pile P5 being driven.

  FIG. 16 shows some of the conventional anti-falling measures. One is to drill a hole c near the top end of the adjacent steel sheet pile P4 and hook the hook 201 of the auxiliary crane 200 into the hole c, or hold the top end with a predetermined clamp (not shown) and This is a method of pulling upward by a crane 200 (Patent Document 3). Moreover, as another method, the method of welding each joint part of steel sheet piles P4 and P3 and steel sheet piles P3 and P2 (code | symbol w1 and w2 are welding parts), or although not shown, the joint part of steel sheet piles P4 and P3 There is a method (Patent Document 4, Patent Document 5) or the like for fixing a jig straddling the wire with a bolt.

  Even during the pulling out of the steel sheet pile, there is a co-up phenomenon in which the existing steel sheet pile follows up. The degree of the joint rising phenomenon varies depending on the time elapsed from the time when the steel sheet pile group is driven to the time of drawing. If the two steel sheet piles are pulled out while being engaged due to the joint rise phenomenon, the subsequent separation is difficult and often cannot be reused. If a joint rise phenomenon occurs when pulling out, once it is driven to its original position, a hole is made in the steel sheet pile that rises together, and a force that draws the steel sheet pile to another steel sheet pile is applied using the hole. The resistance prevents the joint from rising.

  The above-described measures for preventing both the joint fall and the joint rise use a natural phenomenon in which the ground strength, which has been disturbed and lowered by driving a steel sheet pile into the ground, recovers again with the lapse of time after driving. In other words, the existing steel sheet pile has a greater frictional force with the ground as the time elapses after driving, that is, in the existing steel sheet pile group engaged with each other, It uses the fact that it has a high resistance to rising together.

Japanese Utility Model Publication No. 6-43041 Japanese Utility Model Publication No. 6-43042 JP-A-6-57737 Japanese Patent Laid-Open No. 7-259094 JP 2000-345556 A

When the phenomenon of co-falling or co-raising occurs, first, the drawing and driving of the sheet pile in which the phenomenon occurs are repeated, which increases the work load and the construction time.
In addition, the above-described conventional measures for preventing the double fall or the double rise have the following problems.
Pulling the adjacent sheet pile with an auxiliary crane during driving in order to prevent the joints from falling down involves a risk of falling because the load is applied to the crane at two locations. Further, when a hole is made in the sheet pile, welding or bolt fixing is performed, the work load increases. Furthermore, in the case of temporary construction, since the holes and welded portions cannot be reused, these portions are cut as damaged portions, and labor, time, and materials are wasted.

  In view of the above current situation, the present invention is a device for preventing joint lowering and joint rising in the construction of sheet piles with joints such as steel sheet piles, which has less work and time burden, does not waste materials, and An object of the present invention is to provide a device capable of improving workability and performing high-quality construction, and a construction method of a sheet pile using the same.

  In order to achieve the above object, the present invention provides the following configuration. The numbers in parentheses are reference numerals of the drawings described later, and are attached for reference.

One aspect of the steel sheet pile co-falling prevention device according to the present invention is a beam-shaped pedestal portion (2) having rigidity that cannot be deformed ,
A first clamp (1a) attached to one end of the pedestal (2) for gripping the top end of an existing sheet pile (P4) located next to the sheet pile (P5) being driven or pulled out; ,
A second clamp that is attached to the other end of the pedestal (2) and grips the top end of an existing sheet pile (P2) other than the sheet pile (P4) gripped by the first clamp (1a). Part (1b).

  In the above aspect, the second clamp part (1b) is located between the sheet pile (P4) gripped by the first clamp part (1a) with an intermediate sheet pile (P3) interposed therebetween. The top of the sheet pile (P2) is gripped.

  The said aspect WHEREIN: The support | pillar part (3) attached to the lower surface center part of the said base part (2) and mounting on the top end of the said intermediate | middle sheet pile (P3) was further provided, It is characterized by the above-mentioned.

  In the aspect described above, a guide member (7) further including a surface extending downward from the column portion (3) and capable of being fitted to a side surface of the intermediate sheet pile (P3) is further provided.

  The said aspect WHEREIN: The said support | pillar part (3) was further provided with the moving mechanism (8) for position adjustment in the direction perpendicular | vertical to the longitudinal direction of the said base part (2).

  The said aspect WHEREIN: The said support | pillar part (3) is comprised from two members (31, 32) arrange | positioned along the direction perpendicular | vertical to the longitudinal direction of the said base part (2).

  In the above aspect, the apparatus further comprises a normal alignment jig (4a, 4c, 4e, 4f) extending from one end of the pedestal (2), and the normal alignment jig (4a, 4c, 4e, 4f) At the tip, a sheet pile abutting member (4a1, 4e1) or a sheet pile engaging member (4c1) for contacting or engaging the joint on the free end side of the sheet pile (P5) being driven, or a sheet pile ( A sheet pile abutting member (4f1) for abutting on the web of P5) is provided.

  In the above aspect, another normal alignment jig (4b, 4d) extending from the other end of the pedestal (2) is further provided.

  In the above aspect, the pedestal portion (2) is formed by connecting a plurality of members (21, 22) in the longitudinal direction.

Another aspect of the sheet pile co-fall prevention device according to the present invention is a beam-shaped base (2),
The both sides of the joint part of the existing sheet pile (P4) and the existing sheet pile (P3) located next to the sheet pile (P5) that is attached to one end of the base (2) and is being driven or pulled out A first clamp (1a) for gripping;
A second clamp portion attached to the other end portion of the pedestal portion (2) for gripping both sides of the joint portion of the existing sheet piles other than the joint portion gripped by the first clamp portion (1a) ( 1b)
An intermediate portion that is attached to the center part of the lower surface of the pedestal part (2) and is located between the joint part that is gripped by the first clamp part (1a) and the joint part that is gripped by the second clamp part (1b) And a post portion (3) placed on the joint portion .

The aspect of the construction method of the sheet pile according to the present invention is a step of installing any one of the above-described coin fall prevention devices on an existing sheet pile excluding the sheet pile to be driven or pulled out,
Installing a machine for driving or pulling on a sheet pile to be driven or pulled; and
And a step of driving or drawing the sheet pile to be driven or pulled out.

  The co-falling prevention device according to the present invention includes a beam-shaped pedestal part and two clamp parts, and the first clamp part is adjacent to an existing sheet pile that is most likely to cause co-falling (next to a sheet pile during driving or drawing). The second clamp portion is configured to grip another existing sheet pile that is firmly fixed to the ground. The co-falling prevention device is arranged on a predetermined top end of the sheet pile group, and the first and second clamp portions are driven to grip a predetermined existing sheet pile, thereby preventing the co-falling phenomenon. . By using this apparatus, operations such as drilling, welding, bolt fixing, and the like, which have been conventionally performed, become unnecessary. As a result, workability is improved, and quick and low-cost construction is possible.

  Due to the features of various modifications of the co-falling prevention device of the present invention, it is possible to prevent the sheet pile from being inclined, meandering, unevenness of the top of the sheet pile, and the entire sheet pile group from being stretched and contracted.

FIG. 1 is a schematic view showing an example of a basic form of a pile co-falling prevention device according to the present invention, (a) a front view, (b) a plan view, (c) a bottom view, and (d) a right side view. is there. 2A and 2B are schematic views showing the installation state of the co-falling prevention device shown in FIG. 1, wherein FIG. 2A is a front view, FIG. 2B is a plan view, and FIG. 2C is a plan view of the next driving process. FIG. 3 schematically shows a co-falling prevention device that is a modified example of the first embodiment, (a) a front view showing an installation state, and (b) a plan view thereof. FIG. 4 schematically shows a co-falling prevention device which is another modified example of the first embodiment, (a) a front view, (b) a front view showing an installation state, and (c) II. Sectional drawing (d) is another embodiment of the guide member. FIGS. 5A and 5B are diagrams schematically showing a co-falling prevention device which is still another modified example of the first embodiment. FIG. 5A is a front view, and FIG. 5B is an enlarged view of a dotted dotted box at the center of FIG. Sectional drawing, (c) is an enlarged sectional view of a dotted line box on the right side of (a). FIG. 6 is a sectional view taken along the line II in FIG. FIG. 7 is a view schematically showing a part of a co-falling prevention device which is still another modified example of the first embodiment, (a) a front cross-sectional view of a clamp portion mounting portion, and (b) ( It is III sectional drawing of a). FIGS. 8A and 8B are bottom views showing the installation state of the co-falling prevention device of FIG. FIG. 9 is a front view schematically showing a co-falling prevention device which is still another modified example of the first embodiment. FIG. 10 schematically shows a co-falling prevention device which is still another modified example of the first embodiment, (a) a front view showing an installation state, and (b) a plan view thereof. FIG. 11 schematically shows a co-fall prevention device which is still another modification of the first embodiment, (a) a front view showing an installation state, (b) a plan view, and (c). It is a top view of the next implantation process. FIG. 12 schematically shows a co-fall prevention device which is still another modified example of the first embodiment, (a) a front view showing an installation state, (b) a plan view, and (c). It is a top view of the next implantation process. FIG. 13 schematically shows a co-falling prevention device 10J which is still another modified example of the first embodiment, (a) a front view showing an installed state, (b) a plan view, and (c). It is a top view of the next implantation process. FIG. 14: is the schematic which shows an example of 2nd Embodiment of the steel sheet pile co-fall prevention apparatus by this invention, (a) The front view which shows an installation state, (b) The bottom view, (c) is It is a bottom view of the next driving process. FIG. 15 schematically shows a co-fall prevention device that is a modification of the second embodiment, (a) a front view showing an installation state, (b) a bottom view thereof, and (c) a next driving operation. It is a bottom view of a process. FIG. 16 is a schematic diagram for explaining an example of a conventional steel sheet pile construction method.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings of the respective embodiments and modifications, the same or similar components are denoted by the same or similar reference numerals.

The application object of the co-falling prevention apparatus according to the present invention is a sheet pile with a joint that engages with each other, such as a steel sheet pile, a steel pipe sheet pile, and a PC sheet pile. Hereinafter, a steel sheet pile will be mainly illustrated and described as an example of a sheet pile with a joint, but the same applies to other sheet piles. Therefore, “steel sheet pile” in the following description may be read as “steel pipe sheet pile” or “PC sheet pile” which is another sheet pile or “sheet pile” which is a superordinate concept. The required modification of the apparatus due to the difference in the type of sheet pile can be performed using known techniques that are obvious to those skilled in the art.
Moreover, although the joint fall prevention device according to the present invention will be described as a device for preventing joint fall when the sheet pile is driven, the present device can be applied as it is as a joint rise prevention device when the existing sheet pile is pulled out. Is. Therefore, this apparatus can be more accurately called “an up-and-down movement accompanying sheet pile device”.

(1) 1st Embodiment FIG. 1: is the schematic which shows an example of 1st Embodiment of the steel sheet pile co-falling prevention apparatus by this invention, (a) Front view, (b) Plan view, ( c) bottom view, (d) right side view.

  2A and 2B are schematic views showing the installation state of the co-falling prevention device shown in FIG. 1, wherein FIG. 2A is a front view, FIG. 2B is a plan view, and FIG. 2C is a plan view of the next driving process. (For the sake of brevity, in the plan views of (b) and (c), illustration of the drive unit 5 and the suspension member 6 is omitted, and the clamp units 1a and 1b show only the gripping claws.) In FIG. This device is applied to a U-shaped steel sheet pile. In the steel sheet pile group consisting of U-shaped steel sheet piles, the steel sheet piles are alternately engaged in opposite directions.

  As shown in FIG. 1A, the main part of the co-falling prevention device 10 according to the first embodiment is a pedestal part 2 and first and second clamp parts 1a and 2 provided at both ends of the pedestal part 2, respectively. The clamp part 1b. The pedestal portion 2 is a beam-shaped member having sufficient rigidity. As shown in FIG. 2A, the pedestal portion 2 is arranged so that the longitudinal direction thereof is along the construction progress direction. In the illustrated example, the pedestal portion 2 is an H-shaped steel material, but may be a square or box-shaped steel material. The length L of the pedestal portion 2 shown in FIG. 1B is appropriately set according to the width of the steel sheet pile to be applied, and the width W of the pedestal portion 2 is appropriately set according to the height of the steel sheet pile to be applied. The In the illustrated example, the upper surfaces of the clamp portions 1 a and 1 b are attached to the lower surfaces of the end portions of the pedestal portion 2.

  The clamp portions 1a and 1b are gripping devices having a gripping force of about 10 t per unit, for example. From experience, the steel sheet pile being driven is about 10t of the joint resistance force to pull the adjacent steel sheet pile, so it is sufficient to use a plurality of gripping devices having a gripping force of about 10t per unit. Although it can be considered, it is selected appropriately according to the construction conditions. Usually, a general small vibro hammer gripping device can be used as the clamp portions 1a and 1b.

  The clamp parts 1a and 1b each have a gripping claw composed of a fixed claw 1a1 and 1b1 and a movable claw 1a2 and 1b2, similarly to a known gripping device for vibro hammers. The width of these grip claws (for example, 90 to 125 mm) is appropriately selected according to the width of the steel sheet pile to be gripped (400 to 900 mm).

  The fixed claw 1a1 and the movable claw 1a2 of the first clamp part 1a and the fixed claw 1b1 and the movable claw 1b2 of the second clamp part 1b are located on the opposite sides of the steel sheet pile in the illustrated example. Is attached. As another example, the fixed claws 1a1, 1b1 and the movable claws 1a2, 1b2 may be arranged on the same side with respect to the steel sheet pile.

  In addition, when applying to another kind of sheet pile with a joint, the clamp part which has a structure suitable for the holding | grip of the said sheet pile with a joint is employ | adopted. Any of the sheet piles with joints has a known gripping device at the top, and these gripping devices can be used.

  In the illustrated example, a drive unit 5 for driving the movable claws 1a2 and 1b2 is installed at the center of the upper surface of the pedestal unit 2. The drive unit 5 is, for example, a hydraulic pump, and houses a battery that is a power source, a pump body, a switching valve, and an oil tank in an appropriate housing. By using the battery, the power supply becomes cordless, so that the work of the co-falling prevention device 10 can be easily performed.

  As another example, the drive unit 5 may not be incorporated in the apparatus. For example, a drive device (configuration corresponding to the drive unit 5) separately placed on the ground may be connected to the hydraulic cylinder of the clamp unit of the present device by a hydraulic hose and driven.

  Preferably, the column portion 3 is attached to the center of the lower surface of the pedestal portion 2 of the co-falling prevention device 10. In the example shown in the drawing, the support column 3 is composed of a flat plate member 3 a that abuts the top end of the steel sheet pile and a column member 3 b that connects the pedestal unit 2. The bottom area of the flat plate member 3a is appropriately set according to the size of the steel sheet pile to be applied. The column member 3b of the column 3 is an H-shaped steel material in the illustrated example, but may be a square or box-shaped steel material. Or you may comprise the whole support | pillar part 3 with one square or box-shaped steel materials.

  Preferably, a suspension member 6 is provided on the upper surface of the pedestal portion 2 of the co-falling prevention device 10 to be used when the co-falling prevention device 10 is attached to and detached from the steel sheet pile.

  Reference is now made to FIG. As shown to Fig.2 (a), the 1st clamp part 1a of the co-falling prevention apparatus 10 hold | grips the top end h of the existing steel sheet pile P4 located next to the steel sheet pile P5 during driving. On the other hand, the second clamp 1b grips the top end h of the steel sheet pile P2 located between the steel sheet pile P4 and one intermediate steel sheet pile P3. The steel sheet pile P2 is driven in the driving process three times before the steel sheet pile P5 being driven. Therefore, in the steel sheet pile P2, it is considered that the surrounding ground strength once lowered at the time of driving is already recovered and has sufficient resistance. The co-falling prevention device 10 plays a role of fixing the steel sheet pile P4 to the steel sheet pile P2. Thereby, it becomes possible to prevent the co-falling phenomenon of the steel sheet pile P4.

  In principle, the second clamp portion 1b may grip any existing steel sheet pile other than the steel sheet pile P4 gripped by the first clamp portion 1a. Further, in principle, a plurality of second steel sheet piles (for example, steel sheet pile P2 and steel sheet pile P1) may be gripped by providing a plurality of second clamp portions 1b instead of one. The present invention does not exclude these embodiments. However, in consideration of the size and weight of the co-falling prevention device, necessary and sufficient co-falling prevention performance, etc., the second clamp portion 1b is a piece of intermediate steel between the steel sheet pile P4 that tends to cause co-falling. It is preferable to hold the steel sheet pile P2 positioned with the sheet pile P3 interposed.

  The support column 3 is placed on the top end h of the steel sheet pile P3 so that the steel sheet pile P3 located in the middle does not float up. As shown in FIG.2 (b), it is suitable for the planar member 3a of the support | pillar part 3 to cover and hold | suppress to the joint part of the both ends of the intermediate steel sheet pile P3. By the support column 3, the heights of the top ends h of the steel sheet piles P4 and P2 held by the clamps 1a and 1b can be matched. Here, referring to FIGS. 1A and 1D, the position of the top end h of the designed steel sheet pile is indicated by a one-dot chain line. The bottom surface of the flat member 3a of the support column 3 is designed so that the position of the top end h when the clamp portions 1a and 1b grip the steel sheet pile P coincides.

  The steel sheet pile group is designed to be driven along a normal line n shown in FIG. However, in practice, each steel sheet pile may meander slightly from the normal line n due to reasons such as construction techniques. Regarding the positions of the fixed claws 1a1, 1b1 and the movable claws 1a2, 1b2 of the clamp part 1a and the clamp part 1b with respect to the steel sheet piles as shown in the figure, or on the same side, One that is easy to follow along the normal line n is appropriately selected.

  Refer to FIG. 1 again. Preferably, a normal alignment jig serving as a guide for driving the steel sheet pile along the normal is attached to the upper surface of the pedestal portion 2 of the co-falling prevention device 10. In the example shown in the figure, a pair of normal alignment jigs 4 a and 4 b are provided and project from both ends of the pedestal portion 2 symmetrically. The normal alignment jig 4a includes a support plate member 4a2 that extends horizontally from the right end portion of the pedestal portion 2 in the right direction, and a sheet pile contact member 4a1 provided at the tip thereof. The normal alignment jig 4b includes a support plate member 4b2 that extends horizontally from the left end portion of the pedestal portion 2 in the left direction, and a sheet pile contact member 4b1 provided at the tip thereof.

  In the illustrated example, since the normal line n is a straight line, the normal line matching jigs 4 a and 4 b extend in parallel to the longitudinal direction of the pedestal 2. On the other hand, when the normal line n is a curve, the normal line matching jigs 4 a and 4 b are attached so as to extend at an appropriate angle in the horizontal plane with respect to the longitudinal direction of the pedestal portion 2.

  With reference to Fig.2 (a) (b) (c), the driving | operation process of two continuous steel sheet piles P5 and steel sheet piles P6 is demonstrated. 2 (a) and 2 (b) show a driving process of the steel sheet pile P5. As a preparatory step, the co-falling prevention device 10 is lowered onto the top ends of the steel sheet piles P2 to P4 by a crane (not shown) using the hanging part 6, and the movable claws of the clamp parts 1a and 1b are driven by the driving part 5. The steel sheet piles P4 and P2 are gripped.

  Next, the steel sheet pile P5 to be driven is suspended by a crane, and the steel sheet pile P5 is erected while engaging one of the joints with the joint of the steel sheet pile P4. At this time, the contact surface of the sheet pile contact member 4a1 at the tip of the normal alignment jig 4a contacts the joint P5a on the free end side of the steel sheet pile P5. Thereby, the steel sheet pile P5 is prescribed | regulated in the correct position with respect to the normal line n. In this state, a pile driving machine (not shown) is attached to the top end of the steel sheet pile P5, and the steel sheet pile P5 is driven.

  FIG.2 (c) has shown the driving process of the steel sheet pile P6 driven next to the steel sheet pile P5. After completing the driving of the steel sheet pile P5 as a preparation step, the drive unit 5 is driven to release the clamps 1a and 1b, the suspension unit 6 is used to lift the co-fall prevention device 10 and then the horizontal plane Rotate 180 degrees. Thereby, the normal alignment jig | tool 4b turns to a construction advancing direction. Subsequently, the co-falling prevention device 10 is lowered onto the top ends of the steel sheet piles P3 to P5, and the movable claws of the clamp portions 1a and 1b are driven by the drive unit 5 to grip the steel sheet piles P5 and P3.

  Next, the steel sheet pile P6 to be driven is placed in the same manner as the steel sheet pile P5 described above, and driven in the same manner. In this case, the sheet pile contact member 4b1 of the normal alignment jig 4b contacts the joint P6a on the free end side of the steel sheet pile P6, so that the steel sheet pile P6 is defined in a correct position with respect to the normal line n. .

  When the joint falling prevention device 10 is applied to a U-shaped steel sheet pile, since it is necessary to rotate 180 degrees for each steel sheet pile driving, a pair of normal alignment jigs are also provided. However, since the co-fall prevention device of the modification shown in FIG. 11 described later can be constructed without rotating even if it is a U-shaped steel sheet pile, only one normal alignment jig is required. Moreover, since the co-fall prevention apparatus of the modification shown in FIG. 12 mentioned later is applied to a hat-shaped steel sheet pile, only one normal alignment jig is required.

  Hereinafter, various modifications 1 to 9 of the first embodiment will be described, but the characteristic configurations in these modifications may be applied in combination as long as there is no problem. In the description of each modification, differences from the co-falling prevention apparatus 10 shown in FIGS. 1 and 2 will be mainly described.

(1-1) Modification 1 of the first embodiment
FIG. 3 schematically shows a co-falling prevention apparatus 10A that is a modified example of the first embodiment, (a) a front view showing an installation state, and (b) a plan view thereof.

  In the co-falling prevention device 10A, the hydraulic cylinder portions of the upper half of the clamp portions 1a and 1b are incorporated in both ends of the pedestal portion 2A. In this case, the pedestal portion 2A is formed of a square or box-shaped steel material. Compared with the double drop prevention device 10 shown in FIG. 1, the double drop prevention device 10A can reduce the overall height of the device and make it compact. Although not shown, as another example, the hydraulic cylinders in the upper half of the clamps 1a and 1b may be attached to the left and right side surfaces of both ends of the base 2A.

  Further, in the co-falling prevention device 10A, the drive unit 5 is also accommodated in the internal space of the base unit 2A. In this respect as well, the overall height of the apparatus can be reduced and made compact.

  Further, in the co-falling prevention device 10A, the support post 3A is formed of one square or box-shaped steel material. The bottom surface of the square or box-shaped steel material presses the top end of the intermediate steel sheet pile P3.

(1-2) Modification 2 of the first embodiment
FIG. 4 schematically shows a co-falling prevention device 10B which is another modified example of the first embodiment, (a) a front view, (b) a front view showing an installation state, and (c) I- I sectional drawing, (d) is another Example of a guide member. (For the sake of brevity, (c) in the II cross-sectional view, the clamp portions 1a and 1b show only the gripping claws.)

  In the co-falling prevention device 10B, a guide member 7 that extends downward from the lower surface of the support column 3 (in the illustrated example, the lower surface of the planar member 3a) with an appropriate length is attached by welding or bolting. As shown in FIG. 4C, the guide member 7 has a surface that can be fitted to the inner side surface of the web w and the left and right flanges f in the intermediate steel sheet pile P3. When the co-falling prevention device 10B is installed at the top end of the steel sheet pile group, the guide member 7 is lowered while being fitted to the intermediate steel sheet pile P3. When the guide member 7 is fitted to the intermediate steel sheet pile P3, the support column 3 is accurately arranged at the center in the width direction of the intermediate steel sheet pile P3, and the first and second clamp portions 1a and 1b are The center in the width direction of each of the steel sheet piles P4 and P2 can be accurately grasped.

  Since the guide member 7 drives the new steel sheet pile P5 in a state where the co-falling prevention device 10B accurately grasps and fixes the center of the web of the existing steel sheet piles P4 and P2, the entire steel sheet pile group is shrunk ( It is possible to suppress the shortening from the design length) and the hitting elongation (from the design length). In addition, the guide member 7 makes it easy to construct along the specified normal line n. This is particularly useful in deadlines such as earth retaining work and water stop work.

  FIG. 4D is a front view of a state in which a guide member 7A, which is another embodiment of the guide member 7, is attached to the planar member 3a. The guide member 7A includes members 7a and 7b divided into two parts by cutting out the central portion of the guide member 7. The guide member 7A has the same function as the guide member 7.

(1-3) Modification 3 of the first embodiment
5 and 6 are diagrams schematically showing a co-fall prevention device 10C which is still another modified example of the first embodiment. 5A is a front view, FIG. 5B is an enlarged cross-sectional view of a dotted dotted box at the center of FIG. 5A, and FIG. 5C is an enlarged cross-sectional view of a dotted dotted box on the right side of FIG. FIG. 6 is a sectional view taken along the line II in FIG.

  The co-falling prevention device 10 </ b> C includes a back-and-forth movement mechanism 8 </ b> A for the column part 3 and a back-and-forth movement mechanism 8 </ b> B for the clamp parts 1 a and 1 b. The front-rear direction is a direction perpendicular to the longitudinal direction of the pedestal portion 2 in the horizontal plane. There are several types of common steel sheet piles with different flange heights. When applied to steel sheet piles with different flange heights, the column part 3 is placed at an appropriate position at the top of the steel sheet pile by appropriately adjusting the position of the column part 3 and the clamp parts 1a, 1b in the front-rear direction. In addition, the clamp portions 1a and 1b can securely grip the steel sheet pile web.

  5B and 6, the back-and-forth movement mechanism 8 </ b> A of the support column 3 includes a lower flange 2 a of the H-shaped steel material of the pedestal unit 2, an insertion flat plate member 8 a, and an upper side of the H-shaped steel material 3 b of the support column 3. It is comprised using the flange, the volt | bolt 8c, and the nut 8d. FIG. 6 shows a II cross-sectional view.

  As shown in FIGS. 5B and 6, the lower flange 2a of the pedestal portion 2 is provided with a plurality of wide slits 2a1 in the front-rear direction, and the insertion flat plate member 8a has a plurality of narrow slits 8a1. It is drilled in the front-rear direction. The lower flange 2a and the insertion flat plate member 8a are fixed to each other so that a pair of the wide slit 2a1 and the narrow 8a1 overlap in the vertical direction. Thus, the pair of wide slits 2a1 and narrow slits 8a1 form a T-shaped space. The head of the bolt 8b is accommodated in the wide slit 2a1, the shaft portion of the bolt 8b passes through the narrow slit 8a1, and further passes through the upper flange of the H-shaped steel 3b of the support column 3 and is fixed at the lower end with a nut 8c. Has been. In this mechanism, the head of each bolt 8 b can slide back and forth in each wide slit 2 a 1, so that the column portion 3 can move back and forth with respect to the pedestal portion 2.

  The forward / backward movement mechanism 8B of the clamp part 1a shown in FIG. 5 (c) has basically the same configuration as the forward / backward movement mechanism 8A of the column part 3. In this case, the lower end of the bolt 8b is screwed to the upper end of the casing of the clamp 1a instead of being fixed with a nut. Although not shown, the same applies to the back-and-forth movement mechanism of the clamp 1b.

  Both the back-and-forth moving mechanism 8A of the support column 3 and the back-and-forth moving mechanism 8B of the clamp portions 1a and 1b may be provided, or only one of them may be provided. Moreover, the back-and-forth movement mechanism shown in FIGS. 5 and 6 is an example, and various configurations other than this are possible.

(1-4) Modification 4 of the first embodiment
7 and 8 are diagrams schematically showing a part of a co-fall prevention device 10D which is still another modified example of the first embodiment. 7A is a front cross-sectional view of the clamp portion mounting portion, and FIG. 7B is a III cross-sectional view of FIG. 8 (a) and 8 (b) are bottom views showing the installation state of the co-falling prevention device 10D of FIG. (For the sake of simplicity, some components are omitted in FIG. 8 and the cross section is shown for the steel sheet pile.)

  7 (a) and 7 (b), the rotation mechanism 9 of the clamp portion 1a (the same applies to the clamp portion 1b) includes a lower flange 2a of the H-shaped steel material of the pedestal portion 2, an insertion flat plate member 9a, and a clamp portion. The upper end of the housing 1a, pins 9b, and bolts 9c are used.

  As shown in FIG. 7B, a circular hole 2a2 is formed in the lower flange 2a of the pedestal portion 2 at a position corresponding to the center of the upper surface of the casing of the clamp portion 1a. Further, four wide slits 2a3 are bored in the lower flange 2a along the circumference concentric with the circular hole 2a2 within the upper surface of the casing of the clamp portion 1a. A circular hole 9a2 which is concentric with the circular hole 2a2 and smaller than the circular hole 2a2 is formed in the insertion flat plate member 9a. The insertion flat plate member 9a is further provided with a narrower slit 9a3 narrower than the wide slit 2a3. The lower flange 2a and the insertion flat plate member 9a are fixed so that the circular hole 2a2, the circular hole 9a2, and the wide slit 2a3 and the narrow slit 9a3 overlap in the vertical direction.

  The head of the pin 9b is accommodated in the circular hole 2a2, the shaft of the pin 9b passes through the circular hole 9a2, and the lower end is fixed in a recess formed in the upper end of the casing of the clamp part 1a. ing.

  The pair of wide slits 2a3 and narrow slits 9a3 form a T-shaped space. The head of the bolt 9c is accommodated in the wide slit 2a3, and the shaft portion of the bolt 9c passes through the narrow slit 9a3 and is screwed to the upper end of the casing of the clamp portion 1a.

  According to this mechanism, the head of each bolt 9c is slidable in the wide slit 2a3 with the pin 9b as the center, so that the clamp part 1a can rotate with respect to the pedestal part 2 with the pin 9b as the center. It is.

  FIG. 8 (a) shows a state in which the steel sheet piles P2 to P4 are accurately driven along the normal line n. In this case, it is not necessary to adjust the angle of the clamp portions 1a and 1b by the rotation mechanism. FIG. 8B shows a state where the steel sheet pile P2 and the steel sheet pile P4 are slightly deviated from the normal line n and meandered. In this case, by adjusting the angles of the clamp portions 1a and 1b by the rotation mechanism, the clamp portions 1a and 1b can reliably hold the steel sheet piles P4 and P2 deviated from the normal line n.

  As another example of the rotation mechanism of the clamp part, only the mechanism composed of the central circular hole and the pin 9b described above, or only the mechanism composed of the slit on the circumference and the bolt 9c described above may be provided. . Moreover, the rotation mechanism shown in FIG.7 and FIG.8 is an example, Comprising: Various structures besides this are possible.

  The turning mechanism is also useful when the normal n is not a straight line but a curved line. For example, it is a case where a sheet pile is driven in a circular shape or an arc shape. In that case, the angle of the clamp portion is adjusted by the rotation mechanism so as to follow the curve of the normal line n.

(1-5) Modification 5 of the first embodiment
FIG. 9 is a front view schematically showing a co-falling prevention device 10E which is still another modified example of the first embodiment.

  In order to align the top ends of the steel sheet pile groups, it is preferable to hold the steel sheet pile after securing the horizontal level of the co-falling prevention device using a level before gripping the steel sheet pile by the co-falling prevention device. In the co-fall prevention device 10 </ b> D shown in FIG. 9, an inclinometer 11 serving as a level is attached to the front center portion of the pedestal portion 2. The inclinometer 11 includes a pointer 11a and a scale 11b.

(1-6) Modification 6 of the first embodiment
FIG. 10 schematically shows a co-falling prevention device 10F which is still another modified example of the first embodiment, (a) a front view showing an installation state, and (b) a plan view thereof. (For the sake of brevity, in the plan view of (b), illustration of the drive unit 5 and the suspension member 6 is omitted, and the clamp units 1a and 1b show only gripping claws.)

  As shown in FIG. 10A, in the co-falling prevention apparatus 10F, normal alignment jigs 4c and 4d having a configuration different from the normal alignment jigs 4a and 4b shown in FIG. 1 are employed. The normal alignment jigs 4c and 4d are provided symmetrically so as to correspond to the 180 degree rotation in the horizontal direction of the co-falling prevention apparatus 10F.

  The normal alignment jig 4c includes a support plate member 4c2 that extends horizontally from the right end portion of the pedestal portion 2 in the right direction, and a sheet pile engaging member 4c1 provided at the tip thereof. The normal alignment jig 4d includes a support plate member 4d2 that extends horizontally from the left end portion of the pedestal portion 2 in the left direction, and a sheet pile engaging member 4d1 provided at the tip thereof.

  The sheet pile engaging member 4c1 has a shape obtained by cutting a part of the steel sheet pile having the same shape as the steel sheet pile P5 to be driven. Specifically, it has an appropriate width L1 (for example, 1/2 or 1/3 of the full width) and an appropriate length L2 including one joint of the steel sheet piles. It is a dummy steel sheet pile. The sheet pile engaging member 4c1 is fixed at a predetermined position on the support plate member 4c2 by welding or bolts. At the time of driving, driving is performed in a state where the joint P5a on the free end of the steel sheet pile P5 being driven and the joint 4c11 of the sheet pile engaging member 4c1 are engaged. Thereby, it becomes easy to make the normal line of a steel sheet pile group.

(1-7) Modification 7 of the first embodiment
FIG. 11 schematically shows a co-falling prevention device 10G which is still another modified example of the first embodiment, (a) a front view showing an installed state, (b) a plan view thereof, and (c). These are top views of the next driving process. (For the sake of brevity, in the plan views of (b) and (c), the drive unit 5 and the suspension member 6 are not shown, and the clamp units 1a and 1b show only the gripping claws.)

  The co-falling prevention device 10G separates one strut portion in the first embodiment described above into two in the front-rear direction, and is provided with a first strut portion 31 and a second strut portion 32.

  In the first embodiment described above, two normal alignment jigs are provided symmetrically, but in this example, only one normal alignment jig 4e is provided. The normal alignment jig 4e includes a support plate member 4e2 extending in the construction progress direction from the center in the width direction of the pedestal portion 2, and a sheet pile contact member 4e1 attached to the tip thereof. In this case, the two surfaces of the sheet pile contact member 4e1 are contact surfaces with the steel sheet pile.

  As shown in FIG.11 (b), when driving the steel sheet pile P5, the 1st support | pillar part 31 is pressing down the steel sheet pile P3, and one side of the sheet pile contact member 4e1 of the normal alignment jig | tool 4e is shown. The side surface is in contact with the joint P5a on the free end side of the steel sheet pile P5. When the steel sheet pile P6 is driven in the next step, as shown in FIG. 11 (c), the second support 32 presses the steel sheet pile P4, and the sheet pile contact member of the normal alignment jig 4e. The other side surface of 4e1 is in contact with the joint P6a on the free end side of the steel sheet pile P6.

  In this example, there is an advantage that it is not necessary to rotate the co-fall prevention device 10G by 180 degrees when moving to the next process.

(1-8) Modification 8 of the first embodiment
FIG. 12 schematically shows a co-falling prevention device 10H which is still another modified example of the first embodiment, (a) a front view showing an installation state, (b) a plan view thereof, and (c). These are top views of the next driving process. (For the sake of brevity, in the plan views of (b) and (c), the drive unit 5 and the suspension member 6 are not shown, and the clamp units 1a and 1b show only the gripping claws.)

  The joint falling prevention device 10H is an example applied to a hat-shaped steel sheet pile. In a steel sheet pile group consisting of hat-shaped steel sheet piles, the steel sheet piles are engaged in the same direction. As in the case of the U-shaped steel sheet pile, the clamp portion 1a grips the steel sheet pile P4 positioned next to the steel sheet pile P5 being driven, the column portion 3 is placed on the intermediate steel sheet pile P3, and the clamp portion 1b Holds the adjacent steel sheet pile P2.

  In the case of a hat-shaped steel sheet pile, since all the steel sheet piles are in the same direction, it is not necessary to rotate the co-fall prevention device 10H by 180 degrees when moving to the next process. Therefore, only one normal alignment jig 4f is provided. The normal alignment jig 4f includes a support plate member 4f2 extending from an appropriate location of the pedestal portion 2 in the construction progress direction, and a sheet pile contact member 4f1 attached to the tip thereof. In the illustrated example, the sheet pile abutting member 4f1 is brought into contact with the hat-shaped steel sheet pile web. As another example, the sheet pile abutting member 4f1 may be brought into contact with the free end side arm of the hat-shaped steel sheet pile.

  In addition, since a hat-shaped steel sheet pile is wider than a U-shaped steel sheet pile, a longer pedestal 2 is required. Therefore, it is preferable to form the base product 2 having an appropriate length by connecting a plurality of members. In the illustrated example, two basic members 21 at both ends and a central auxiliary member 22 are connected. Thereby, the base part 2 can be made into the general purpose applicable to the various steel sheet piles from which width differs. In addition, it is applicable not only to this example but to other modified examples to form the pedestal portion 2 by connecting a plurality of members in the longitudinal direction.

(1-9) Modification 9 of the first embodiment
FIG. 13 schematically shows a co-falling prevention device 10J which is still another modified example of the first embodiment, (a) a front view showing an installation state, (b) a plan view thereof, and (c). These are top views of the next driving process. (For the sake of brevity, in the plan views of (b) and (c), the drive unit 5 and the suspension member 6 are not shown, and the clamp units 1a and 1b show only the gripping claws.)

  In the joint falling prevention device 10J, a third clamp portion 1c that holds the top end of the intermediate steel sheet pile P3 is provided in place of the support column portion 3 in the first embodiment.

  The third clamp part 1c may be basically the same gripping device as the first and second clamp parts 1a, 1b, and is attached to the lower surface of the central part of the pedestal part 2. In the case of this example, the fixed claws and the movable claws of the first and second clamp portions 1a and 1b are arranged on the same side with respect to the steel sheet pile, and the movable claws and the movable claws of the third clamp portion 1c are movable. It is preferable to arrange | position a nail | claw so that it may become an other side with respect to those of the 1st and 2nd clamp parts 1a and 1b.

  In the illustrated example, the insertion plate member 8a shown in FIGS. 5 and 6 is attached between each clamp part and the pedestal part 2, and a mechanism for moving the clamp part back and forth is provided. Thereby, the front-back position of each clamp part can be adjusted, and it can respond to the steel sheet pile from which the height of a flange differs.

  Or although not shown in figure, the insertion flat plate member 9a shown in FIG.7 and FIG.8 may be attached between each clamp part and the base part 2, respectively, and the rotation mechanism of each clamp part may be provided. Thereby, the angle adjustment in the horizontal surface of each clamp part can be performed, and it can respond to the deviation from the normal line of a steel sheet pile.

(2) Second Embodiment FIG. 14 is a schematic view showing an example of a second embodiment of the steel sheet pile co-falling prevention device according to the present invention, (a) a front view showing an installation state, and (b). The bottom view, (c) is a bottom view of the next driving step. (For the sake of simplicity, in the bottom views of (b) and (c), the clamp portions 1a and 1b show only the gripping claws, and the steel sheet pile shows a cross section.)

  In addition, as long as there is no trouble, you may apply each characteristic structure in the modifications 1-9 of 1st Embodiment mentioned above in combination with 2nd Embodiment.

  The co-falling prevention device 20 has two clamp portions 1 a and 1 b attached to the lower surface of the pedestal portion 2. In this example, no support is provided. In the joint falling prevention device 20, the device can be reduced in size and weight.

  As shown in FIG. 14B, the clamp portions 1a and 1b are attached to be inclined with respect to the normal line n. This is because each clamp portion grips the flanges on both sides of the joint portion where the two steel sheet piles engage. The 1st clamp part 1a is holding the both sides of the joint part of the steel sheet pile P4 which is easy to produce a joint fall, and the adjacent steel sheet pile P3. The 2nd clamp part 1b is holding the both sides of the joint part of the steel sheet pile P3 and the adjacent steel sheet pile P2.

  In the next driving step shown in FIG. 14 (c), the co-falling prevention device 20 is rotated 180 degrees and is moved by one steel sheet pile in the construction progress direction to hold the joint portion.

  In addition, since the angle of a flange changes with kinds of U-shaped steel sheet pile, the inclination angle in the horizontal plane of the clamp parts 1a and 1b can be adjusted by providing the rotation mechanism of the clamp part shown in FIG.7 and FIG.8. It is preferable that

  Moreover, in principle, the clamp part 1b may hold | grip the joint part of the steel sheet pile driven further forward, and does not exclude also about such an Example. However, in order to reduce the weight and size of the device, it is preferable to grip the adjacent joint portion.

(2-1) Modification of Second Embodiment FIG. 15 schematically shows a co-fall prevention device 20A that is a modification of the second embodiment, and (a) a front view showing an installation state; (B) The bottom view, (c) is a bottom view of the next driving step. (For the sake of simplicity, in the bottom views of (b) and (c), the clamp portions 1a and 1b show only the gripping claws, and the steel sheet pile shows a cross section.)

  20 A of joint fall prevention apparatuses attach the two clamp parts 1a and 1b to the both ends of the lower surface of the base part 2, and attach the support | pillar part 3 to the center part. In this example, the normal alignment jig is not shown, but it may be provided in the same manner as in the example of FIG.

  As shown in FIG. 15B, the clamp portions 1a and 1b are attached to be inclined with respect to the normal line n. The 1st clamp part 1a is holding the both sides of the joint part of the steel sheet pile P4 which is easy to produce a joint fall, and the adjacent steel sheet pile P3. The 2nd clamp part 1b is holding the both sides of the joint part of the steel sheet pile P2 adjacent to the steel sheet pile P3, and the adjacent steel sheet pile P1. The column part 3 is placed on the joint part (joint part not gripped by the clamp part) of the steel sheet pile P3 and the steel sheet pile P2 positioned between the two joint parts gripped by the clamp parts 1a and 1b. This joint part is held down.

  In the next driving step shown in FIG. 15 (c), the co-falling prevention device 20A is rotated 180 degrees and moved by one steel sheet pile in the construction progress direction to hold the joint portion.

  Moreover, 20 A of joint fall prevention apparatuses have attached the insertion flat plate member 9a shown in FIG.7 and FIG.8, and have provided the rotation mechanism of the clamp part. In the co-falling prevention device 20A, since the inclination angle of the clamp portion with respect to the flange of the joint portion is reversed when rotated 180 degrees, the inclination angle of the clamp portion is adjusted to the angle of the flange of the joint portion by the rotation mechanism.

10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10J, 20, 20A: Co-fall prevention devices 1a, 1b, 1c: Clamping parts 1a1, 1b1, 1c1: Fixed claws 1a2, 1b2, 1c2: Movable claw 2: Pedestal part 3, 3A: Supporting part 3a: Flat plate member 3b: Column member 4a, 4b, 4c, 4d, 4e: Normal alignment jig 4a1, 4b1, 4e1: Sheet pile contact member 4c1, 4d1: Sheet pile Engaging members 4a2, 4b2, 4c2, 4d2, 4e2: support plate member 5: drive unit 6: suspension member 7: guide member 8: forward / backward moving mechanism 8a: insertion flat plate member 9: horizontal rotation mechanism 9a: insertion flat plate member 11 : Inclinometer P1, P2, P3, P4, P5, P6: Steel sheet pile

Claims (11)

A beam-like pedestal (2) with indeformable rigidity ;
A first clamp (1a) attached to one end of the pedestal (2) for gripping the top end of an existing sheet pile (P4) located next to the sheet pile (P5) being driven or pulled out; ,
A second clamp that is attached to the other end of the pedestal (2) and grips the top end of an existing sheet pile (P2) other than the sheet pile (P4) gripped by the first clamp (1a). And a sheet pile co-falling prevention device, characterized by comprising a portion (1b). The second clamp part (1b) is an existing sheet pile (P2) located between the sheet pile (P4) gripped by the first clamp part (1a) with an intermediate sheet pile (P3) interposed therebetween. 2. The sheet pile co-falling prevention device according to claim 1. The support part (3) attached to the lower surface center part of the said base part (2) and mounting on the top end of the said intermediate sheet pile (P3) was further provided, The feature of Claim 2 characterized by the above-mentioned. The sheet pile co-falling prevention device. The sheet pile according to claim 3, further comprising a guide member (7) extending downward from the support column (3) and having a surface that can be fitted to a side surface of the intermediate sheet pile (P3). Co-falling prevention device. The sheet pile according to claim 3 or 4, wherein the support post (3) further includes a moving mechanism (8) for adjusting a position in a direction perpendicular to a longitudinal direction of the pedestal (2). Co-falling prevention device.   The said support | pillar part (3) is comprised from two members (31, 32) arrange | positioned along the direction perpendicular | vertical to the longitudinal direction of the said base part (2), The sheet pile co-falling prevention device according to any one of the above. A normal alignment jig (4a, 4c, 4e, 4f) extending from one end of the pedestal (2) is further provided, and the normal alignment jig (4a, 4c, 4e, 4f) is driven into the tip thereof. Sheet pile contact member (4a1, 4e1) or sheet pile engagement member (4c1) for contacting or engaging the joint on the free end side of the sheet pile (P5) inside, or the web of the sheet pile (P5) being driven A sheet pile abutting member (4f1) for abutting on the sheet pile is provided, The sheet pile co-falling prevention apparatus according to any one of claims 1 to 6 . The sheet pile co-falling prevention device according to claim 7 , further comprising another normal alignment jig (4b, 4d) extending from the other end of the pedestal (2). A beam-shaped pedestal (2);
The both sides of the joint part of the existing sheet pile (P4) and the existing sheet pile (P3) located next to the sheet pile (P5) that is attached to one end of the base (2) and is being driven or pulled out A first clamp (1a) for gripping;
A second clamp portion attached to the other end portion of the pedestal portion (2) for gripping both sides of the joint portion of the existing sheet piles other than the joint portion gripped by the first clamp portion (1a) ( 1b)
An intermediate portion that is attached to the center part of the lower surface of the pedestal part (2) and is located between the joint part that is gripped by the first clamp part (1a) and the joint part that is gripped by the second clamp part (1b) And a supporting part (3) placed on the joint part of the sheet pile. The pedestal (2) is co-down prevention device of sheet pile according to any one of claims 1 to 9, characterized in that it is formed by connecting a plurality of members (21, 22) in the longitudinal direction. A step of installing the co-falling prevention device according to any one of claims 1 to 10 on an existing sheet pile excluding a sheet pile to be driven or pulled out;
Installing a machine for driving or pulling on a sheet pile to be driven or pulled; and
And a step of driving or pulling out a sheet pile to be driven or pulled out.

Images