JP2008214940A - Movable suspension timbering - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable suspension timbering supported and suspended by/from a constructed girder supported on an already constructed bridge pier and capable of passing through a position where the bridge pier is provided easily by avoiding the interference with the bridge pier when moving in the direction of axis of the bridge girder and constructing the bridge girder efficiently. <P>SOLUTION: A main beam 12 in the direction of right angle to an axis is supported on the constructed girder 11 supported on the bridge pier 2 to suspend and support supporting bases 15 through a guide rail attached to the main beam 12, a running frame 13 moving along the guide rail, and suspension members connected with the running frame. The supporting bases 15 are mutually joined to be separated in a central part in the direction of right angle to the axis of the constructed girder 11. Each of the separated supporting bases 15 moves onto a side of the axis of the bridge girder due to moving of the running frame 13 along the guide rail together with a plurality of suspension members to open a lower part of the bridge girder. This movable suspension timbering moves in the direction of the axis together with the constructed girder in this condition while preventing the interference with the bridge pier. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a movable suspension support used when a concrete bridge girder is constructed.

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 construction is carried out by projecting each construction block of a predetermined length from the pier or abutment to both sides or one side.
In this cantilever erection method, a bridge girder is constructed for each construction block having a predetermined length from the head of a bridge pier raised on the ground, and the bridge girder is projected in a cantilever manner. In many cases, each block is constructed while balancing the falling moment from the head of the pier to both sides. It is also possible to construct a bridge girder so that it projects from one side of the abutment firmly fixed to the ground to one side. From the center of the pier to one side in the axial direction of the girder, a bridge girder is constructed in advance on the support, and to the other side. Can also be constructed to project in a cantilevered manner.

In order to form each construction block of the constructed bridge girder, a mobile suspension support is generally used. It is supported by the tip of the already formed bridge girder and advances on the bridge girder every time construction of each construction block is completed. What is going on is widely known. In addition to this, there is a case in which a moving girder supported by a construction girder made of steel is installed on the span where the bridge girder is to be constructed and supported on the construction girder. The mobile suspension supporter traveling on such a construction girder can move on the pier together with the construction girder when the bridge girder is constructed over a plurality of spans. For this reason, it becomes easy to move from the span where the cantilever erection has been completed to the next span where the cantilever erection is performed, which is advantageous when the position of the pier is in the ocean or in a river with a high flow rate. Is possible.
Construction of a concrete bridge girder includes a step of placing concrete after assembling a formwork with the above-described movable suspension support, placing reinforcing bars, placing PC steel, and the like.

  On the other hand, in the case of a bridge with a relatively large number of short spans, concrete is cast once for a span girder, and every time a span girder is formed, the bridge girder moves to the next span in order. A mobile suspension supporter is known that performs the construction of In this movable suspension support work, the construction girder supported so as to be movable on the pier and the horizontal beam for supporting the suspension etc. are moved together. It has a length.

  Any of the movable suspension supports using the above-described erection girder needs to move in the axial direction of the bridge girder beyond the position where the bridge pier is provided. In other words, in the case of a movable suspension support that performs cantilever installation, after the cantilever installation is completed for a predetermined span, when the installation girder and the movable suspension support are moved to the next cantilever installation span, The moving suspension support will pass through the position of the pier that supported the girder. Also, in the case of placing concrete for each span, when moving the moving suspension support unit integrated with the construction girder to the next span, it moves beyond the position where the pier was provided. It will be.

  When the mobile suspension support works as described above, when the pier passes through a certain position, the formwork, scaffolding, etc. may interfere with the pier, and the movement suspension support work may be prevented from passing. In other words, in order to support the lower formwork of the bridge girder, the movable suspension supporter is provided with a support base so as to receive the lower side of the position where the bridge girder is formed, and when this moves in the axial direction of the bridge girder It will hit the pier that has already been formed. For this reason, it is considered to move a support stand and avoid a bridge pier. For example, the structures as described in Non-Patent Document 1 and Non-Patent Document 2 have been proposed.

In the movable suspension support described in Non-Patent Document 1 and Non-Patent Document 2, the scaffolding support beams and scaffolding plates constituting the support base are divided into two under the center line in the width direction, that is, the center line in the axial direction of the bridge girder, The center part is rotated downward with the side part as the center of rotation, and the center part of the support base is opened. Thereby, a support stand is avoided on both sides of the bridge pier constructed to support the bridge girder from below, and it passes through the position where the bridge pier is provided.
Bridge and foundation, 1979 Vol. 13 NO. 4, 29, “History and future prospects of concrete bridge” Bridge and foundation, 2003 Vol. 37 NO. 5, pages 1-8, "Design and construction of Hamanako Shimbashi"

  However, in the structure in which the scaffolding support beam of the movable suspension support is divided into two from the center and the center part is opened downward as described above, the scaffolding support beam etc. is greatly inclined every time it passes through the pier. . Therefore, the formwork, scaffolding material, tools, etc., which are placed on the support base that is suspended and supported must be removed once and then loaded again after passing through the pier. For this reason, the work amount for the movement of the movable suspension support is increased, the work process becomes longer and a lot of labor costs are required.

  The present invention has been made in view of the circumstances as described above, and its purpose is to avoid interference with a bridge pier and easily pass through a position where the pier is provided, and to make a concrete bridge girder efficient. It is to provide a movable suspension support that can be erected well.

  In order to solve the above-mentioned problem, the invention according to claim 1 is supported by a construction girder spanned on a bridge pier, on the construction girder or together with the construction girder in the axial direction of the construction girder. A main beam that moves, a support that supports materials for constructing a concrete bridge girder under the erection girder, and a portion of the main beam that protrudes on both sides of the erection girder and suspends the support A plurality of suspension materials to be supported, and the support base is separable into two at an intermediate portion perpendicular to the axis of the installation girder, and the suspension material is separated from the support base Provided is a movable suspension support that supports each of the bridge girders so that they can move in the horizontal direction.

In this movable suspension support, the formwork for forming the bridge girder and the support base that supports uncured concrete, etc. are separated at the central part perpendicular to the axis of the construction girder, and horizontally to the sides of the bridge girder center line. Since it moves, the center part is open | released on both sides, and it can pass and move through the position provided with the pier without interfering with this pier. And since the support base moves horizontally without tilting, it is possible to pass through the pier part without disassembling the formwork on the support base or removing the material on the support base, and the mobile suspension support can be moved easily and easily. Be quick. Further, when building the bridge girder at a predetermined position, it is possible to support the weight of a formwork, uncured concrete, or the like with the central portion of the support base connected.
In the above invention, the erection girder includes a truss structure in addition to a steel girder having an I-shaped section or a box-shaped section.

  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 the 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 2, wherein the support base is a plurality of the support bases arranged in a direction perpendicular to the axis of the bridge girder on both sides of the installation girder. 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.

  As explained above, in the mobile suspension support according to the present invention, the support for supporting the formwork and the uncured concrete for constructing the bridge girder is separated into two, and by moving horizontally to both sides, The central part is opened. As a result, the movable suspension support can move through the position where the pier is provided, and can move stably without removing the members and materials loaded on the support base. . Accordingly, the amount of work required to move the movable suspension support is reduced, and the construction period can be shortened and the construction cost can be reduced.

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 constructs a bridge girder 1 supported on a bridge pier 2 via a support 3 for each construction block of a predetermined length. , Used to overhang. In the present embodiment, as shown in FIG. 1, the concrete bridge girder 1 having a box-shaped cross section is employed.

  The movable suspension support 10 is supported on an erection girder 11 spanned in the axial direction of the bridge girder 1 to be constructed so as to be movable in the axial direction of the erection girder 11. The main part of the movable suspension support 10 is a main beam 12 supported substantially at right angles to the axis of the installation girder 11, and is supported by the main beam 12 and arranged substantially parallel to the main beam 12. The guide rail 13, the traveling frame 14 supported by the guide rail 13 and movable along the guide rail 13, and the bridge girder 1 installed under the bridge girder 1 are constructed. A support base 15 that supports a formwork and uncured concrete, and a plurality of suspension members 21 and 22 that are connected at the upper end to the traveling frame 14 and support the support base 15 at the lower end. Has been.

The erection girder 11 is formed of a box-shaped cross-section member 11a made of steel, and the two box-shaped cross-section members 11a are arranged in parallel to the axial direction of the bridge girder 1 to be constructed. It is connected. And it is supported on the bridge girder 1 or the pier 2 that has already been erected, and can be moved in the axial direction of the bridge girder 1. In this embodiment, it is supported on three piers standing from the ground, and spans two spans. Then, after the bridge girder 1 is formed so as to extend from the pier 2 to a predetermined length, in order to similarly construct the bridge girder 1 from other adjacent piers, it remains supported on the pier. It moves the distance for one span.
In this embodiment, the construction girder 11 in which two box-shaped cross-section members are arranged in parallel is adopted, but other cross-sectional configurations such as one made of a box-shaped cross-section member may be selected. it can. Moreover, a truss structure may be sufficient.

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 is a single main beam by combining two truss-like members. This main beam is disposed substantially perpendicular to the axial direction of the erection girder 11 and its length extends to both sides larger than the width of the bridge girder 1 to be erected. Two sets of such main beams 12 are provided at predetermined intervals in the axial direction of the installation girder 11, and are supported on the installation girder 11 via vertical beams 31. The top portions of the two main beams 12 are connected by a connecting member 12d, and the main beam 12 is prevented from falling and buckling in the lateral direction. The vertical beam 31 integrally connects the two sets of main beams 12, and includes a front wheel 32 and a rear wheel 33 at the front portion and the rear portion in the axial direction of the installation girder 11, respectively. Thus, jacks 34 are provided at the front and rear portions so that the girder 11 is supported so as to be able to run and can be stably supported at a predetermined position. Therefore, during the operation of forming one construction block of the bridge girder 1, the longitudinal beam 31 is pushed up and supported by the jack 34, and the support of the jack 34 is released at the time of movement, and the front wheel 32 is driven by the driving device 35 to construct the construction girder 11 You can travel on the top.
The positions of the front wheels 32 and the rear wheels 33 and the arrangement of the jacks 34 are appropriately determined according to the length of one construction block when the bridge girder 1 is formed. In this Embodiment, although the length of one construction block is set with 4m-5m, the length of a construction block can be determined suitably.

  The guide rails 13 are made of H-shaped steel, and each of the main beams 12 is fixedly supported at a lower portion of a portion 12c projecting on both sides of the installation girder 11. 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. ing.

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.

  The support base 15 includes a cross beam 15a disposed substantially perpendicular to the bridge girder axis, 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 on these beams. The main part is composed of the arranged scaffolding plates 15c. 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 rear portion 15 d of the support base 15 can be rotated downward in order to avoid interference with the pier 2 when constructing a construction block closest to the pier 2. ing.

  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 lateral 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.

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.
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. . Then, it can be placed on the scaffolding plate 15c to perform assembling work, etc. When the assembled formwork 18 is supported at a predetermined position and concrete is placed, it is suspended from the traveling frame 14. The mold is suspended and supported by a mold suspension material 23 and a mold suspension material (not shown) that hangs directly from the main beam.

The suspension member includes 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 mold steel. The upper end portion is fixed to the traveling frame 14, is suspended vertically downward, and the lower end portion is 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 1 a of the bridge girder so as not to interfere with the protruding portion 1 a of the bridge girder 1. The avoidance portion 24 is formed in a substantially “U” shape by joining H-shaped steel, and an upper horizontal portion 24 a disposed on the projecting portion 1 a of the bridge girder 1 in a direction substantially perpendicular to the axis of the bridge girder. And a lower horizontal portion 24c disposed directly below the upper horizontal portion 24a and below the protruding portion of the bridge girder, and the upper horizontal portion 24a and the lower horizontal portion 24c on the side of the protruding portion 1a in a substantially vertical direction. The vertical part 24b to connect is provided. The upper horizontal portion 24a is connected to the upper steel rod 22a suspended vertically from the traveling frame 14, the upper end of the lower steel rod 22b is connected to the lower horizontal portion 24c, and the lower end is a horizontal beam of the support base 15. 15a. Accordingly, the tensile force is transmitted from the upper steel bar 22a provided above the overhanging portion 1a to the lower steel bar 22b disposed below the overhanging portion 1a while avoiding the overhanging portion 1a of the bridge girder. The second suspension member 22 can suspend and support the support base 15 on the center line side from the side edge. 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.
In addition, the code | symbol 24d in FIG.1 and FIG.2 is an anti-sway member which connects an avoidance part between the two 2nd suspension members arrange | positioned in the axial direction of a bridge girder, and prevents an avoidance part to sway so that it may turn. is there.

The movement suspension support 10 as described above moves along with the movement of the construction girder 11, and the operation of opening the support 15 when the pier 2 is provided and passes through the position will be described. It is a schematic sectional drawing which shows the state which the support stand 15 of the construction | work 10 moved to the horizontal direction.
The horizontal movement of the support base 15 is performed in a state in which the formwork 18 is detached from the bridge girder and placed on the support base 15.

  First, the transverse beam 16 for supporting the formwork is divided substantially on the central axis of the bridge girder 1, that is, at the center of the transverse beam 16. The transverse beam 16 for supporting the formwork is joined by a bolt at the center, 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 are similarly divided into two parts from the central part by removing the bolts. In this state, the traveling frame 14 is moved along the guide rail 13 to the side of the bridge girder 1. That is, the traveling frame 14 supported by the right-hand overhanging portion of the main beam 12 projecting from the installation girder 11 to both sides moves to the right side, and the traveling frame 14 supported by the left-hand overhanging portion moves to the left side. The suspension members 21 and 22 are connected to the traveling frame 14 and move horizontally in a direction perpendicular to the central axis of the bridge girder 1 as the traveling frame 14 moves. As a result, the support base 15 suspended and supported by the suspension members 21 and 22, the formwork 18 supported on the support base, the material, and the like are separated at the central portion, and each moves to both sides of the bridge girder 1. At this time, the support base 15 moves in the horizontal direction while being supported substantially horizontally, and the central portion can be opened while the mold frame 18 and the like are loaded on the support base 15. Further, since the suspending materials 21 and 22 and the support base 15 are moved together, the relative position between the position of the center of gravity of the support base 15 and the formwork loaded thereon and the position of the suspension materials 21 and 22. The relationship does not change, and the support base 15 moves in a stable state. In this manner, the support base 15 is separated at the central portion and moved sideways, so that the support base 15 moves in the axial direction of the bridge girder 1 while avoiding the already constructed pier 2 as shown in FIG. be able to.

Next, a process in which the moving suspension support passes through the position where the bridge pier 2 is provided when the bridge girder is installed using the moving suspension support 10 will be described with reference to FIGS. 5 and 6.
FIG. 5 and FIG. 6 are schematic views showing a process of erection of a bridge girder using the movable suspension support 10 according to the present invention. In this embodiment, the bridge head falls from the column head formed on the pier to both sides. The cantilever construction method is adopted in which bridge girder is extended for each construction block while maintaining the moment balance.

  As shown in FIG. 5A, the construction girder 11 is installed over two spans on the three piers 2a, 2b, 2c raised from the foundation ground. The bridge girder 1 is already formed so as to protrude from the first pier 2a, and on the second pier 2b, a support (not shown) in which the column head of the bridge girder 1 is attached to the upper part of the pier 2b is used. Is formed. In this way, on the bridge piers 2a and 2b where the bridge girder 1 has already been formed, the cradles 4a and 4b are arranged on the formed bridge girder 1 and on the third pier 2c where the bridge girder 1 has not yet been constructed. The support girder 11 is supported by the support 4 and the support column 5. Then, the two moving suspension supporters 10-1 and 10-2 are supported by the erection girder 11 and arranged on both sides of the column head already formed on the pier 2b. On the support bases 15-1 and 15-2 of these movable suspension supports, the construction blocks are constructed so that the part of the construction block that is continuous with the pillar head of the bridge girder 1 already formed projects to both sides. When the construction of one construction block is completed, the movable suspension supporters 10-1 and 10-2 move in the direction in which the bridge girder 1 is extended, and construction of the bridge girder 1 is sequentially repeated for each construction block. The concrete placement of the construction block is performed by alternately or simultaneously performing the construction blocks on both sides of the pier 2b, so that the difference in the overturning moment of the bridge girder 1 from side to side is not excessive and the balance is maintained.

Thus, a bridge girder is constructed for each construction block, and as shown in FIG. 5B, the construction of the bridge girder 1 is completed between the first pier 2a and the second pier 2b, and the second pier 2b. And the third pier 2c, the bridge girder 1 extends from the second pier 2b to the vicinity of the center of the span. Thereafter, as shown in FIG. 5 (c), the movable suspension supporters 10-1 and 10-2 are moved to the vicinity of the second pier 2b, moved forward together with the construction girder 11 and moved from the second pier 2b to the fourth pier. The construction girder 11 is bridged between two diameters extending over the pier 2d. This movement is pushed out while the construction girder is supported by the roller 6 provided on the cradle 4. The moving suspension support 10-2 supported on the front side in the process of moving in this way passes through the position where the third bridge pier 2c is provided, and the rear movement suspension support 10-1 is the second Passes through the position where the pier 2b is provided. And when passing the position where the pier was provided, as shown in FIG. 4, the support stand 15 is open | released to the right and left sides in the center part, and it avoids and moves, without interfering with the pier 2. As shown in FIG. Thereafter, construction of the bridge girder 1 is started so as to project from the third pier 2c to both sides as shown in FIG. 6 (a), and the second pier 2b and the third pier 2b as shown in FIG. 6 (b). The bridge girder 1 is constructed so as to be continuous with the pier 2c. Further, between the third pier 2c and the fourth pier 2d, the bridge girder 1 is constructed to project from the third pier 2c to almost the center of the span. Hereinafter, the movement of the erection girder 11 and the movable suspension supporters 10-1 and 10-2 and the cantilever erection of the bridge girder 1 are repeated, and the bridge girder 1 is constructed over the entire span.
In the above embodiment, the support base 15 is separated and moved to the left and right sides only when the moving support 10 passes through the position where the pier 2 is provided. Similarly, when interfering with the movable suspension supporter 10, it is possible to avoid the interference by separating and moving the support base to the side.

In the present embodiment, the support base 15 is separated into two almost immediately below the central axis of the construction girder 11 and the bridge girder 1, but the separated positions are shown in FIGS. As described above, it may be set at a position deviated from just below the central axis to either the left or right.
When the position at which the support base 15 is separated is biased to one side in this way, in the one support base that is 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 can be reduced to either the left or right. Thus, when the inclined ground surface is approaching one side of the bridge girder 1 or when another bridge girder arranged side by side is already constructed on one side, the support base 15 Even if the movement to the side is restricted, the present invention can be applied.

On the other hand, in this embodiment, the movable suspension supporter 10 moves on the erection girder 11 and cantilever the bridge girder 1 for each construction block. The present invention can also be applied to a movable suspension support that supports a formwork and provides a scaffold in this range.
In this movable suspension support, for example, a construction girder is spanned between one diameter, and the main beam in a direction perpendicular to the axis is integrally provided with the construction girder within this range. And the support stand suspended and supported from this main beam similarly to the said embodiment is divided | segmented in the center part, and moves horizontally to a side.
In such a movable suspension support, the center part of the support base is opened to the side every time concrete for one span is placed, and the pier is provided by moving the distance for one span with the construction girder. Pass through the specified location. This is repeated to efficiently construct a concrete bridge girder between multiple spans.

It is a schematic sectional drawing 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 process in which the movable suspension support shown in FIG. 1 moves on a bridge pier, and builds a bridge girder. It is the schematic which shows the process in which the movable suspension support shown in FIG. 1 moves on a bridge pier, and builds a bridge girder. It is a schematic sectional drawing which shows other embodiment of the movement suspension support work which concerns on this invention. It is a schematic sectional drawing which shows the state which the support stand of the movable suspension support shown in FIG. 7 moved to the horizontal direction so that the center part might be open | released.

Explanation of symbols

1: bridge girder, 2: pier, 3: support, 4: cradle, 5: prop, 6: roller
10: Mobile suspension support, 11: Installation girder, 12: Main beam, 12a: Upper chord material made of mold steel, 12b: Lower chord material made of mold steel, 12c: Overhang portion of main beam, 12d: Connecting material, 13: Guide rail , 14: Traveling frame, 14a: Traveling wheel, 15: Support base, 15a: Cross beam, 15b: Small beam, 15c: Scaffolding plate, 15d: Rear part of support base, 16: Cross beam for supporting the formwork, 17: Mold Vertical beam for frame support, 18: Formwork,
21: 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 part, 24b: Vertical part, 24c: Lower horizontal part, 24d: Anti-sway member, 31: Vertical beam, 32: Front wheel, 33: Rear wheel, 34: Jack, 35: Drive device, 41: Chain block, 42: Counterweight

Claims (4)

Supported by the construction girder over the pier,
A main beam that moves in the axial direction of the installation girder on or along with the installation girder,
A support base for supporting materials for constructing a concrete bridge girder under the erection girder;
A plurality of suspension members that are connected to portions of the main beam that protrude from both sides of the installation girder and that support the support base;
The support base is separable into two at an intermediate portion in a direction perpendicular to the axis of the installation girder,
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 by a plurality of suspension members arranged in a direction perpendicular to the bridge girder axis on both sides of the installation girder,
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.

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