JP2008303666A - Movable suspension support and assembling method of movable suspension support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable suspension support used in the cantilever installation construction of a bridge girder and its assembling method by which interference with a bridge pier which has been already constructed can be avoided for the easy passing of a position where the bridge pier is arranged, and the concrete bridge girder can be efficiently installed. <P>SOLUTION: A main beam 12 extending in a direction orthogonal to an axial line is supported to a frame body 11 supported by the bridge pier 2. Each of support bases 15 separated into two from the center is supported so as to be suspendible by a guide rail 13 fitted to the main beam 12, a traveling frame 14 movable along the guide rail and suspending members 21, 22 connected to the traveling frame. The support bases are moved to both sides and allowed to pass a position where the bridge pier is provided in separated states, and the frame body is moved to a predetermined position. After that, the traveling frame 13 moves to the width-directional center of the bridge girder along the guide rail together with a plurality of the suspending members, and the separated support bases 15 are connected at the center. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a movable suspension support used when building a concrete bridge girder and an assembling method of the movable suspension support.

  Various methods have been proposed for erection of prestressed concrete bridge girders. As one of them, there is a so-called cantilever erection method in which a bridge girder is extended and constructed for each construction block of a predetermined length from the pier or abutment to both sides or one side. This cantilever erection method is often constructed by raising a bridge pier on the ground and projecting a bridge girder for each construction block while maintaining the balance of the falling moment from the head to both sides. There are also cases where a bridge girder is constructed so as to protrude from one abutment firmly fixed in a ground shape.

In order to form each construction block of the bridge girder, a mobile suspension support is generally used, and it is supported by the tip part of the bridge girder already formed, and advances on the bridge girder every time construction of each construction block is completed. Things are widely known.
Many of these movable suspension supports are arranged on the bridge girder in the axial direction of the bridge girder, the main beam provided so as to project on both sides of the bridge girder, and the lower part of the frame. The main part is composed of a support base that supports the materials for building the bridge girder, and a suspension material that supports the support base from the main beam, and as the frame moves forward on the bridge girder The support base suspended from the main beam also moves forward.

Such a movable suspension support is described in, for example, Patent Document 1, and is usually assembled as described below.
The frame body is supported on the bridge girder of the pillar head that has already been constructed, and the tip is protruded and installed in the axial direction of the bridge girder to be constructed. When building a bridge girder on both sides of the column head, construct a frame in each direction. And it arrange | positions so that a main beam may protrude on the both sides of a bridge girder on the said frame. The support base is assembled in the ground yard provided almost immediately below the position where the frame projects and is provided, that is, in the front and rear areas close to the pier, flat work areas are provided. The assembled support base is lifted substantially vertically by a suspension member or a lifting suspension member connected to the main beam, and is supported at a position slightly lower than the position of the bridge girder to be constructed.

Each construction block of the bridge girder is constructed as follows using the above moving support.
The support table is used as a scaffold for the worker and supports a part of the concrete casting form on the support table. Then, rebar assembly, PC steel material placement, etc. are performed on this, and concrete is placed so as to be in close contact with the already constructed bridge girder. Reinforcing bars and PC steel materials arranged continuously from the already built bridge girder are embedded in the concrete and hardened to become a continuous bridge girder. Thus, when one construction block is constructed so as to overhang, the moving support is moved forward on the constructed bridge girder and installed so as to protrude from the tip of the newly constructed construction block. In this state, the next construction block is constructed.

In this way, the construction blocks are built in sequence, and once the bridge girder is built up to the specified overhang length, the moving suspension support is retracted once, the support base is lowered to the assembled yard where the assembly was performed, and the frame and The main beam is also demolished. It is then transported to the next pier and assembled on the head of this pier.
Japanese Patent Laid-Open No. 11-117235

  When building concrete bridge girders using the above-mentioned mobile support, depending on the terrain where the piers will be installed, the area where the crane for lifting and assembling the mobile support is assembled on the column head, In some cases, it is difficult to provide a ground yard for assembling the support base at an appropriate place. In particular, when the bridge pier is provided on a steep slope or when there is another structure in the vicinity of the bridge pier, the ground yard may not be provided on the front side of the bridge girder. In other words, if the area immediately below the position where the frame body is projected to the front side overhanging the bridge girder is a steep slope, a ground yard cannot be provided. If the ground yard cannot be provided at this position, the support base cannot be grounded and lifted vertically upward, and the assembling work of the moving support work becomes extremely inefficient. Also, after the bridge girder is extended to a predetermined length and constructed, the work becomes inefficient when the mobile support is retracted to the assembly position and disassembled.

  The present invention has been made in view of the circumstances as described above, and the purpose thereof is a mobile suspension that can be efficiently assembled at a predetermined position even when an area for assembling a mobile support is limited. It is to provide a support and to provide a method for assembling this moving support.

  In order to solve the above-mentioned problems, the invention according to claim 1 is supported so as to be movable on the bridge girder being built that is cantilevered, and protrudes in the axial direction of the bridge girder from the tip of the bridge girder. A frame installed on the frame, a main beam supported by the frame and provided so as to project on both sides of the axis of the bridge girder, and a material for constructing a concrete bridge girder below the frame And a plurality of suspension members that are connected to portions projecting on both sides of the main beam and that support and support the support base, the support base being an intermediate in the direction perpendicular to the axis of the frame body The suspension material can be separated into two at the portion, and the suspension material provides a movable suspension support structure that supports each of the separated support bases so that the horizontal movement can be performed on both sides of the bridge girder. To do.

  Since the support base of this movable suspension support can be separated on both sides of the bridge girder to be constructed, the support base can be separated and assembled on the ground yard. And it can be set as the scaffolding and support work for lifting each with a suspension material, moving both to the center part side in the position which is going to build and construct a bridge girder, and connecting and constructing a bridge girder. That is, even when the ground yard can be provided only in the side area of the pier due to the topography, the support base can be assembled separately on both sides. In addition, even if the ground yard can only be provided in the direction in which the bridge girder is to be built up over the cantilever, the support base is assembled behind the pier and separated into both sides to open the center. In this state, it is possible to pass the position where the pier is provided. And a support stand can be integrally connected in the predetermined position constructed | assembled so that it may move forward with a frame and a main beam, and a bridge girder may be projected.

  The invention according to claim 2 is the movable suspension support structure according to claim 1, wherein the guide rail is supported by the main beam, and is guided by the guide rail, and is movable in the axial direction of the main beam. The suspension member is connected to the main beam via the guide rail and the traveling frame, and each of the support bases separated along with the horizontal movement of the traveling frame includes the traveling frame. It shall move horizontally to both sides of the bridge girder.

  Each of the separated support bases of the movable suspension support is moved to both sides of the bridge girder together with the suspension material as the traveling frame is guided by the guide rail and moved horizontally. Therefore, the support position of the support base by the suspension material does not change even when the support base moves in the horizontal direction, and the falling moment of the support base does not change. For this reason, the support base can move in the horizontal direction in a stable state.

  The invention according to claim 3 is the movable suspension support structure according to claim 1 or claim 2, wherein the support base is a plurality of pieces arranged in a direction perpendicular to the axis of the bridge girder on both sides of the frame. It is supported by a suspension material, and a part of the plurality of suspension materials has an avoidance portion bent around the side edge of the bridge girder so as to avoid interference with the bridge girder.

  In this movable suspension support work, by providing the avoidance part, it can be provided on the center line side from the position of the side edge of the bridge girder constructing a part of the suspension material. Thereby, when the support stand provided under the bridge girder is separated at the central portion, each of the separated supports can be stably suspended and supported.

  The invention according to claim 4 is the movable suspension support according to any one of claims 1 to 3, wherein the plurality of suspension members are arranged at predetermined intervals in the axial direction of the main beam, In the state where the support base is separated into two parts, the positions of the respective centers of gravity are arranged so as to be between one suspension member and another suspension member.

  In this movable suspension support construction, it is possible to maintain a state in which a tensile force is applied to any of the plurality of suspension members that support the separated support bases, and no compression force is applied. Therefore, a member having a small cross section such as a steel bar can be used as the suspension material. As a result, it is possible to reduce the weight of the movable suspension support and to easily adjust the height of the support base that supports the suspension.

  The invention according to claim 5 is a frame body that is movable in the axial direction of the bridge girder on the bridge girder and is installed so as to protrude from the tip end portion of the bridge girder in the axial direction of the bridge girder, and the axis of the bridge girder Connected to the main beam that is supported at a substantially right angle and that protrudes on both sides of the bridge girder, the support that supports the material for constructing the bridge girder below the frame, and the portion that protrudes from the frame of the main beam And an assembly method of a movable suspension support construction comprising a suspension material for supporting and supporting the support base, the frame body being placed on a pillar head of a bridge girder already formed on a bridge pier, The main beam is installed, and each of the support bases separated by a dividing line substantially parallel to the axis of the bridge girder is assembled in a ground space provided on both sides of the bridge pier, and the support separated into two parts The base is suspended from the suspension material or the overhanging portion of the main beam. With the lifting material for lifting the support base lowered, each of the piers was lifted on both sides, and the frame body moved with the main beam to a position where each position of the support base was ahead of the pier. Thereafter, the suspension member or the lifting suspension member that supports each of the separated support bases is moved horizontally toward the center portion in the width direction of the bridge girder, and each of the support bases separated into two parts is moved. Provided is a method for assembling a movable suspension support, characterized by joining and integrating.

  In this moving suspension support assembly method, the support base is divided into two at the center, so the support base is assembled at the ground yard provided on the side of the pier, and the main beam placed on the column head Each support base can be lifted and supported almost vertically. And since the frame body suspends and supports the support stand in a state of being separated into two, and moves to the tip of the direction in which the bridge girder is projected, the pier does not become an obstacle to the movement of the support stand. The table can be easily moved. And after the frame is installed at the tip part in the direction of projecting the bridge girder, the suspension material is moved horizontally toward the center, thereby joining the central part of the support base and It can be a scaffold.

  According to a sixth aspect of the present invention, there is provided a frame body that is movable in the axial direction of the bridge girder on the bridge girder and is installed so as to protrude from the tip end portion of the bridge girder in the axial direction of the bridge girder, and the axis of the bridge girder A main beam supported substantially at right angles and projecting on both sides of the bridge girder, a support for supporting materials for constructing the bridge girder below the frame body, and a portion of the main beam projecting from the frame body A moving suspension support assembly method comprising: a suspension member that is connected and supports the support stand; and constitutes the first movement support support on the column head of the bridge girder already formed on the pier. A frame body and a frame body constituting the second movable suspension support projecting in the opposite direction in the axial direction of the bridge girder, respectively, and a frame body constituting the first movable suspension support construction and the second A continuous rail member on the frame that forms the movable suspension support Placing the main beam on the rail member on the frame constituting the first moving suspension support, below the position where the frame constituting the first movement suspension support is installed, Assembling each of the support bases separated by a dividing line substantially parallel to the axis line of the bridge girder, the support bases separated into two are attached to the suspension base or the support base suspended from the projecting portion of the main beam. After lifting each of the separated support bases by using a lifting material for lifting, after moving the main beam along the rail member, and moving to the frame constituting the second moving suspension support, The suspension member or lifting suspension member that supports each of the separated support bases is moved horizontally toward the center portion in the width direction of the bridge girder, and each of the two separate support bases is joined. , Movement characterized by unity To provide a method of assembling the shoring.

In this method of assembling the movable suspension support, since the rail member is continuously provided on the upper part of each frame constituting the first movable suspension support and the second movable suspension support, the support base is suspended and supported. The main beam can be moved on the rail and installed at a predetermined position. In other words, as long as the frame that constitutes the first mobile suspension support and the second mobile suspension support is in the range where the ground yard is provided, the support base is placed at this position. Can be lifted and moved in the axial direction of the bridge girder to be built with the main beam. At this time, the support base is suspended and supported on both sides in the axial direction, so that the position at which the pier is provided can be moved without obstruction.
After assembling the support base integrally at a predetermined position, by separating the rail member between the first moving support work and the second moving support work, each moving support work advances in the opposite direction. Can be constructed to project bridge girders on both sides.

  As described above, in the mobile suspension support according to the present invention and the assembly method of this mobile suspension support, the mold for constructing the bridge girder and the support base for supporting the uncured concrete are separated into two. After assembling and moving to a predetermined position where the bridge girder is extended and constructed, they can be connected together. Therefore, even if the location where the ground yard for assembling the support base is limited by topography or other structures, it is possible to efficiently assemble the mobile suspension support and cantilever the concrete bridge girder. It becomes.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic sectional view of a mobile suspension support according to the present invention, and FIG. 2 is a schematic side view of the same mobile suspension support.
This movable suspension support 10 is used when constructing a concrete bridge girder 1 and is used for projecting and constructing the bridge girder 1 supported by the pier 2 for each construction block of a predetermined length. It is what In this embodiment, as shown in FIG. 1, it is employed to construct a concrete bridge girder 1 having a box-shaped cross section.

  The main part of the movable suspension support 10 is composed of two truss-like frame bodies 11 installed so as to protrude in the axial direction of the bridge girder 1 from the tip of the bridge girder 1 to be constructed, and the axis of the frame body 11 Two main beams 12 supported at substantially right angles, a guide rail 13 supported by the main beam 12 and disposed substantially parallel to the main beam 12, and supported by the guide rail 13. A traveling frame 14 that is movable along the bridge, a support base 15 that is disposed below the bridge girder 1 to be installed and supports the formwork and uncured concrete for constructing the bridge girder 1 during the construction, and the above-described traveling An upper end portion is connected to the frame 14 and a plurality of suspension members 21 and 22 that suspend and support the support base 15 at the lower end portion.

The said frame 11 is formed with the member on the truss which consists of steel, and the two are arrange | positioned substantially parallel to the axial direction of the bridge girder 1 which it is going to construct | assemble. These frames are connected to each other by the main beam 12, and the deformation in the lateral direction is restricted by the diagonal member 11a. And it is supported on the bridge girder 1 which has already been erected, and can be moved in the axial direction of the bridge girder 1.
Each of the frames 11 is supported in the vicinity of the end of the bridge girder 1, and the main jack 3 that moves the frame 11 up and down to adjust the vertical position, and an anchor that suppresses the lifting force of the rear portion by the anchor member 4 a. A jack 4 is provided. The main jack 3 and the anchor jack 4 are driven by hydraulic pressure, and are connected to an electric hydraulic pump.
In addition to the above, various types of main jacks 3 and anchor jacks 4 can be used.

A rail 5 is attached to the upper surface of the bridge girder 1 in the axial direction, and the frame 11 can travel on the rail 5 by a wheel 6 attached to the lower part of the front and move forward. Yes. At this time, the expansion / contraction portion of the main jack 3 is shortened so as not to contact the upper surface of the bridge girder 1, and the weight of the frame 11 is loaded from the wheel 6 to the rail 5.
Further, the rear end portion of the frame body 11 can freely move in the axial direction of the rail 5, and the rail 5 does not jump up due to a forward load even if the restraint of the anchor jack 4 is released. It can be locked. The rear part of the rail 5 is connected to the bridge girder 1 by an anchor steel material (not shown) so that it can resist the lifting force acting from the rear end part of the frame body 11.

  The main beam 12 is a member made of steel, and is a truss-shaped member whose shape steel is an upper chord member 12a and a lower chord member 12b, and a single main beam 12 is formed by combining two truss-like members. . The main beam 12 is arranged substantially at right angles to the axial direction of the bridge girder, and the length of the main beam 12 extends to both sides larger than the width of the bridge girder 1 to be installed.

  The guide rails 13 are made of H-shaped steel, and the main beams 12 are fixedly supported at the lower portions of the portions 12c projecting on both sides of the frame body 11, respectively. And as shown in FIG. 3, the traveling wheel 14a which supports the traveling frame 14 is locked so as to hold the lower flange of the H-shaped steel from the lower side, and the traveling wheel 14a travels on the upper surface of the lower flange. It has become.

The travel frame 14 is provided for each of the guide rails 13 and is supported by the guide rails 13 via the travel wheels 14 a locked to the guide rails 13. The upper ends of the suspension members 21 and 22 are connected to the traveling frames 14, and the support base 15 is suspended and supported by the suspension members 21 and 22.
The traveling frame 14 is connected to both ends of the guide rail 13 via a chain block 41, and the traveling frame 14 is moved along the guide rail 13 by winding up the chain blocks 41. Further, when the bridge girder 1 is being constructed, the chain block 41 can restrain the traveling frame 14 from moving along the guide rail 13. Furthermore, the traveling frame 14 can be supported by a steel bar (not shown) directly from the main beam 12 when the bridge girder 1 is being constructed, and the work can be performed in a stable state.
In addition, it can replace with the said chain block 41, and the other means which can drive | work the traveling frame 14, such as a drive mechanism using a chill hole or a motor, can also be used.

  The support base 15 includes a cross beam 15a disposed substantially perpendicular to the axis of the bridge girder, a plurality of small beams 15b made of H-shaped steel arranged in the axial direction of the bridge girder 1 on the cross beam, and these beam 15b. The main part is comprised with the scaffold board 15c arranged on the top. And this support stand 15 is provided in the range required in order to perform the operation | work which forms this construction block under the one construction block.

As shown in FIG. 2, the horizontal beams 15a are respectively provided below the two main beams 12, and are formed by joining a box-shaped cross-section member or a groove-shaped cross-section member with a gap therebetween. A suspension member 21 is inserted between the two members, and a locking member 21a fixed to the lower end portion of the suspension member 21 contacts the lower surface of the transverse beam 15a to support the transverse beam 15a. The cross beam 15a is divided substantially at the center in the axial direction, that is, almost directly below the center line of the bridge girder 1 to be constructed, and both the cross beams 15a are joined by pins or bolts. Therefore, it is possible to separate the cross beam 15a on both sides by extracting these pins or bolts. In addition, the scaffolding plate 15c supported on the cross beam 15a via the small beam 15b can be divided almost directly below the center line of the bridge girder 1, and can be divided and moved to both sides together with the cross beam 15a. It has become.
In addition, when the horizontal beam 16 for supporting the formwork, the vertical beam 17 for supporting the formwork, and the formwork 18 are supported on the support base 15, they are separated at the central portion and can be moved to both sides. .
The structure for supporting the horizontal beam in a suspended manner is not limited to the above structure, and other structures can be adopted as long as the structure is supported firmly.

On the other hand, when the cross beam 15a is connected at the center, the bending moment and shearing force acting on the cross beam 15a can be transmitted, and the load on the scaffolding plate 15c is supported in a stable state. It is something that can be done. Therefore, the worker can stably perform the assembling work of the formwork and the concrete placing work on the scaffolding plate 15c, and further assemble a scaffolding as a work table on the scaffolding plate 15c as necessary. Is also possible.
The horizontal beam 16 for supporting the formwork, the vertical beam 17 for supporting the formwork, and the formwork 18 can also be placed on the scaffolding plate 15c and can be assembled and the assembled formwork 18 is assembled. Is supported at a predetermined position, and when placing concrete, the concrete is suspended and supported by a hanging material for a formwork (not shown) suspended directly from the main beam 12.

  The suspension members 21 and 22 include a first suspension member 21 provided at a position away from the central axis of the bridge girder 1 and a second suspension member 22 provided at a position close to the central axis. The first suspension member 21 is made of steel and has an upper end fixed to the traveling frame 14, suspended vertically below, and a lower end locked to the cross beam 15 a of the support base 15. On the other hand, as shown in FIG. 1, the second suspension member 22 has an avoiding portion 24 that avoids the protruding portion of the bridge girder 1 so as not to interfere with the protruding portion of the bridge girder 1. This avoiding portion 24 is formed in a substantially “U” shape by joining H-shaped steel, and is an upper horizontal portion disposed on the projecting portion of the bridge girder 1 in a direction substantially perpendicular to the axis of the bridge girder 1. 24a, a lower horizontal portion 24c disposed almost directly below the upper horizontal portion 24a and below the overhanging portion of the bridge girder 1, and an upper horizontal portion 24a and a lower horizontal portion 24c on the side of the overhanging portion 1a. And a vertical portion 24b connected in the direction.

  The upper horizontal portion 24a is connected to the upper steel rod 22a suspended vertically from the traveling frame 14, the upper end portion of the lower steel rod 22b is connected to the lower horizontal portion 24c, and the lower end portion of the support base 15 is connected. It is connected to the horizontal beam 15a. As a result, a tensile force is transmitted from the upper steel rod 22a provided above the overhanging portion to the lower steel rod 22b disposed below the overhanging portion while avoiding the overhanging portion of the bridge girder 1, and the side edge of the bridge girder 1 is The second suspension member 22 can suspend and support the support base 15 on the center line side. In addition, the shape of an avoidance part is not limited to the above shapes, A thing of various shapes can be employ | adopted if it is a shape which can avoid interference with the bridge girder 1. FIG.

The support base 15 can be divided and integrated at the central portion by the following process, or can be united by connecting the ones lifted at the side at the central portion.
The transverse beam 16 for supporting the formwork is divided substantially on the central axis of the bridge beam 1, that is, at the center of the transverse beam 16. The transverse beam 16 for supporting the formwork is joined at the center with a bolt or a pin, and can be separated by removing the bolt. The mold 18 is also divided into both sides at the center. Further, the horizontal beam 15a and the scaffolding plate 15c of the support base 15 can be similarly divided into two from the central portion.

  Each of the support bases 15 thus divided moves substantially horizontally to the side of the bridge girder 1 as the traveling frame 14 moves along the guide rails 13. That is, the support base 15 suspended and supported by the suspension members 21, 22 and the formwork 18 and the material supported on the support base are divided into the right part of the divided part supported by the right extension of the main beam 12, The divided part supported by the left overhanging part moves to the left side. As shown in FIG. 4, the support base 15 is separated at the central portion and moves to the side in this manner, so that the support base 15 avoids the pier 2 that has already been constructed, and the movable suspension support work can be replaced with the bridge girder 1. Can be moved in the axial direction.

  On the other hand, when the support base 15 is assembled in a state of being divided into two parts, it can be assembled integrally in the reverse process to the above after being lifted by the lifting material hanging from the main beam 12. Each of the divided support stands is a portion where the main beam 12 protrudes on both sides of the bridge girder 2 and is pulled up to a predetermined height as shown in FIG. And it is supported by the main beam 12 via the traveling frame 14 and the guide rail 13. At the position where the support base 15 is lifted, when the support base 15 interferes with the pier 2 and cannot move to the center side, the frame 11 is advanced and moved to a position where the lower part of the bridge girder 1 to be constructed is opened. To do. Thereafter, the traveling frame 14 can be moved along the guide rail 13, and the support base 15 can be pulled toward the central axis side of the bridge girder 1 to join them together. Contrary to the above-described separation, bolts or pins are attached and the cross beam 15a is joined to the possibility of transmitting a bending moment. In such a state, it can be set as the support and scaffolding of the bridge girder 1 constructed by overhanging.

Next, a description will be given of a method for assembling the mobile suspension support 10 as described above, in which the installation position of the ground yard is limited by terrain or the like.
FIG. 5 is a side view and a front view showing a state in which the ground yard 7 for assembling the movable suspension support 10 is provided on both sides of the pier 2. When the position where the pier 2 is provided is a steep slope, the ground yard 7 may be provided at such a position.
As shown in FIG. 5, the frame 11 and the main beam 12 are installed on the column head 1 a that has already been constructed using the ground yard 7 provided on both sides of the pier 2. At this time, the frame body 11 and the main beam 12 are at positions where the support base assembled in the ground yard 7 can be lifted. Thereafter, in the ground yard 7, the support base 15 is assembled in two. And each of the divided | segmented support stand 15 is lifted by the lifting material 25 for the lifting suspended from the part protruded to the both sides of the main beam 12. FIG. As shown in FIG. 6, these support bases 15 are lifted up to a predetermined height on the side of the pier 2, the suspension members 21 and 22 are connected to the support base 15 and the travel frame 14, and the support base 15 is connected to the travel frame 14. And the main beam 12 is supported via the guide rail 13. At this time, as shown in FIG. 4, the support base 15 is supported in a state where the central portion is opened.

  The support bases 15 lifted to a predetermined height are suspended and supported on both sides of the pier 2, and it is impossible to move these support bases 15 to the center portion side because they interfere with the pier 2. For this reason, the frame 11 is moved forward in the direction in which the bridge girder 1 protrudes while supporting the support base 15 in a divided state. When the bridge pier 2 is moved from the position where the bridge pier 2 is provided to the position where the lower portion of the bridge girder 1 to be constructed is opened, each traveling frame 14 is moved along the guide rail 13 to the center side of the bridge girder 1. As a result, the support base 15 divided into two parts moves horizontally, and these can be connected at the center to form an integrated support base 15. Thereby, the support work and scaffold for constructing the bridge girder 1 so that it may overhang for every construction block are ensured.

On the other hand, when the frame 11, the main beam 12 supported by the frame 11 and the support base 15 are moved as described above, a movable suspension support for constructing the bridge girder on the opposite side is constructed on the column head 1a. An area for assembly is secured. Therefore, another frame and main beam are installed in this area, and another support base is assembled by dividing on a ground yard provided on both sides of the pier. And like the moving suspension support work 10 demonstrated previously, after lifting a support stand and moving forward in the direction which projects and constructs a bridge girder, the support stand divided and lifted is joined together.
In this way, it is possible to assemble a moving support for cantilevering the bridge girder 1 on both sides from the column head 1a on the pier. And it can be constructed so that the bridge girder is projected over each construction block sequentially while balancing the falling moments on both sides using these.

Next, as shown in FIG. 7, in the case where the ground yard 57 is located adjacent to the pier and can be provided only on one side in the axial direction of the bridge girder, the first movable suspension support 60a and the second A method for assembling the movable suspension support 60b will be described.
First, as shown in FIGS. 7 and 8, rails 55 a and 55 b for making the movable suspension support work movable are attached on the column head 51 a using the ground yard 57. And the frame 61b which comprises the 1st movement suspension support 60a and the frame 61b which comprises the 2nd movement suspension support 60b are installed. At this time, the frame 61 b of the second movable suspension support is installed so as to protrude from the column head 1 a immediately above the ground yard 57. On these frames, connecting rails 58 are attached so as to continue from the frame 61a constituting the first moving suspension support to the frame 61b constituting the second moving suspension support. The connecting rail 58 is separable between the first moving suspension support 60a and the second movement suspension support 60b.

  Further, the main beam 62a of the first moving suspension support is placed on the frame body 61b of the second movement suspension support so that traveling on the connecting rail 58 is possible. Thereafter, the support base 65a is assembled in the ground yard 57, and the support base 65a is lifted by the lifting material 75 that is suspended from the main beam 62a of the first moving suspension support. And it is made to support by the main beam 62a via the suspension material 71, a travel frame, and a guide rail (not shown). At this time, the support base 65a is separated from the central portion to both sides in the same manner as the support base 15 shown in FIG. The suspended support stand 65a is on the rear side of the bridge pier 52 with respect to the direction in which the bridge girder 51 is projected using the first moving suspension support 60a, and is provided with a first movement suspension support provided on the front side. As the main beam 62a travels on the connecting rail 58 to the frame of the work 60a, it moves forward. At this time, the support base 65 moves horizontally on both sides in the same manner as the support base 15 shown in FIG. 4, and passes through the position of the pier 52 without interfering with the pier 52 in a state where the central portion is opened. And after moving to the frame body of the 1st movement suspension support 60a as shown in FIG. 9, a travel frame (not shown) is horizontally moved to the center side in the width direction of the bridge girder 51, and the 1st movement suspension is carried out. The support base 65a of the support work is integrated.

  Further, on the ground yard 57, the support base 65b of the second movable suspension support 60a is assembled, and the support base 65b is lifted from the main beam 62b supported on the connecting rail 58 as shown in FIG. Support at a predetermined height. When the assembly of the first movable suspension support 60a and the second movable suspension support 60b is completed in this way, the connecting rail 58 is located between the first movable suspension support 60a and the second movable suspension support 60b. Then, the connecting portion 58a is removed and separated. Thereby, the 1st movement suspension support 60a and the 2nd movement suspension support 60b can each advance in the opposite direction, and it becomes possible to overhang and construct the bridge girder 51 of each direction. .

In the embodiment described above, the support bases 15 and 65 are separated into two almost immediately below the central axis of the bridge girder 1, but the separated positions are shown in FIGS. As shown, it may be set at a position deviated from just below the central axis to either the left or right.
When the position where the support base 15 is separated is biased to one side in this way, in the one support base 15 separated, the amount of protrusion of the bridge girder 1 toward the central axis is increased, and the overturning moment increases. For this reason, it is desirable to load the counterweight 42 on the side end of the support base 15 and reduce the overturning moment by balancing.

  Thus, when the position which isolate | separates a support stand is biased and set to either side from the center axis line of a bridge girder, when the movable suspension support 10 passes the position of the pier 2, the support stand 15 The amount by which the lens is moved to the side becomes smaller on either the left or right side. Thereby, when the ground surface inclined to the side of the bridge girder 1 is approaching, or when another bridge girder arranged side by side has already been constructed, Even if movement is restricted, the present invention can be applied.

It is a schematic front view which shows the movement suspension support work which concerns on this invention. It is a schematic side view of the movable suspension support shown in FIG. It is a schematic sectional drawing which shows the structure of the guide rail and traveling frame of the movable suspension support shown in FIG. It is a schematic sectional drawing which shows the state which the support stand of the movable suspension support shown in FIG. 1 moved to the horizontal direction so that the center part might be open | released. It is the schematic which shows the ground yard installed in the both sides of a bridge pier. It is a side view which shows the method of assembling a movable suspension support construction using the ground yard shown in FIG. It is the position which adjoins the pier and is the schematic which shows the ground yard installed in the one side of the axial direction of a bridge girder. It is a side view which shows the method of assembling a movable suspension support construction using the ground yard shown in FIG. It is a side view which shows the method of assembling a movable suspension support construction using the ground yard shown in FIG. It is the schematic which shows the method of assembling a movable suspension support construction using the ground yard shown in FIG. It is a front view which shows other embodiment of the movement suspension support work which concerns on this invention. It is a front view which shows the state which the support stand of the movable suspension support shown in FIG. 10 moved to the horizontal direction so that the center part might be open | released.

Explanation of symbols

1, 51: Bridge girder, 2, 52: Bridge pier, 3: Main jack, 4: Anchor jack, 5, 55a, 55b: Rail, 6: Wheel, 7, 57: Ground yard,
10, 60a, 60b: Mobile suspension support 11, 61a, 61b: Frame, 12, 62a, 62b: Main beam, 12a: Upper chord made of section steel, 12b: Lower chord made of section steel, 12c: Main 13: Guide rail, 14: Traveling frame, 14a: Traveling wheel, 15, 65a, 65b: Support base, 15a: Cross beam, 15b: Small beam, 15c: Scaffolding plate, 16: For formwork support Transverse beam, 17: longitudinal beam for supporting the formwork, 18: formwork,
21 and 71: 1st suspension material, 22: 2nd suspension material, 22a: Upper steel rod, 22b: Lower steel rod, 23: Suspension material for formwork, 24: Avoidance part of 2nd suspension material, 24a: upper horizontal portion, 24b: vertical portion, 24c: lower horizontal portion, 25, 75: lifting material for lifting,
41: Chain block, 42: Counterweight, 58: Connecting rail,

Claims (6)

A frame that is supported so as to be movable on the bridge girder under construction that is cantilevered and is installed so as to protrude in the axial direction of the bridge girder from the tip of the bridge girder;
A main beam supported by the frame and provided to project on both sides of the axis of the bridge beam;
A support base for supporting materials for constructing a concrete bridge girder below the frame;
A plurality of suspension members that are connected to portions projecting on both sides of the main beam, and that support and support the support base;
The support base is separable into two at an intermediate portion perpendicular to the axis of the frame,
The said suspension material supports each of the said separated support stand so that a horizontal movement is possible to the both sides of the said bridge girder, The moving suspension support structure characterized by the above-mentioned. A guide rail supported by the main beam;
It is guided by this guide rail and has a traveling frame that is movable in the axial direction of the main beam,
The suspension member is connected to the main beam via the guide rail and the traveling frame,
The movable suspension support according to claim 1, wherein each of the support bases separated along with the horizontal movement of the travel frame moves in the horizontal direction to both sides of the bridge girder. The support base is supported on each side of the frame by a plurality of suspension members arranged in a direction perpendicular to the axis of the bridge beam,
3. The part of the plurality of suspension members has an avoiding portion bent around the side edge of the bridge girder so as to avoid interference with the bridge girder. Moving suspension support. The plurality of suspension members are arranged at predetermined intervals in the axial direction of the main beam,
2. The apparatus according to claim 1, wherein in a state where the support base is separated into two parts, each center of gravity is disposed so as to be between one suspension member and another suspension member. Item 4. The movable suspension support according to any one of Items 3 to 3. A frame that is movable on the bridge girder in the axial direction of the bridge girder and that is installed so as to protrude from the front end portion of the bridge girder in the axial direction of the bridge girder, and is supported substantially at right angles to the axis of the bridge girder, A main beam projecting on both sides of the frame, a support for supporting the material for constructing a bridge girder below the frame, and a portion of the main beam that is projected from the frame to support the support An assembling method of a movable suspension support construction comprising:
Place the frame on the column head of the bridge girder already formed on the pier, and install the main beam on it,
Assembling each of the support bases separated by a dividing line substantially parallel to the axis line of the bridge girder in the ground space provided on both sides of the pier,
The support bases separated into two are lifted respectively on both sides of the pier by the lifting material or the lifting material for lifting the support base suspended from the projecting portion of the main beam,
After the frame body moves with the main beam to a position where each position of the support base is forward of the pier,
Horizontally moving the suspension member or lifting suspension member that supports each of the separated support bases toward the center portion in the width direction of the bridge girder,
A method of assembling a movable suspension support structure, characterized in that each of the support bases separated into two is joined and integrated. A frame that is movable on the bridge girder in the axial direction of the bridge girder and that is installed so as to protrude from the front end portion of the bridge girder in the axial direction of the bridge girder, and is supported substantially at right angles to the axis of the bridge girder, A main beam extending on both sides of the main frame, a support for supporting materials for constructing a bridge girder below the frame, and a portion of the main beam protruding from the frame to be suspended. An assembling method of a movable suspension support construction comprising:
On the pillar head of the bridge girder already formed on the bridge pier, the frame constituting the first moving support and the frame constituting the second moving suspension support are arranged in opposite directions in the axial direction of the bridge girder. Each protruding and installed,
Installing a continuous rail member on the frame constituting the first movable suspension support and the frame constituting the second movable suspension support;
Installing a main beam on the rail member on the frame constituting the first movable suspension support;
Assembling each of the support bases separated by a dividing line substantially parallel to the axis of the bridge girder below the position where the frame constituting the first moving suspension support is installed,
The support bases separated into two are lifted by the lifting material for lifting the support bases suspended from the suspension material or the projecting portion of the main beam,
After moving the main beam along the rail member and moving to the frame constituting the second moving suspension support,
Horizontally moving the suspension member or lifting suspension member that supports each of the separated support bases toward the center portion in the width direction of the bridge girder,
A method of assembling a movable suspension supporter characterized in that each of the support bases separated into two is joined and integrated.

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