JP5409178B2 - Construction method of concrete bridge and moving work apparatus used in the construction method - Google Patents

Description

  The present invention relates to a concrete bridge erection method using a reinforcing bar tip assembly in which a rebar structure for a next block is assembled prior to the completion of construction of one block, and a mobile work apparatus used in the method.

As shown in FIGS. 11 to 13, the conventional construction cycle in the cantilever erection concrete bridge (bridge) construction method is performed after assembling the block formwork, reinforcing bars and PC steel as shown in FIGS. 11 to 13. Concrete placement and curing,
(2) Tensioning / moving work device (moving body) of PC steel of the block,
(3) Consists of the steps of assembling the next block formwork, rebar, and PC steel. And the concrete bridge was constructed by repeating these processes sequentially with the said block, the following block, and a block one after another.
In this case, in the past, after waiting for completion of “concrete placement and curing of the block ((1))”, “PC steel material tension / movement of the moving body ((2))” is performed, and then “Assembly of next block formwork, rebar and PC steel ((3))” was performed.

However, in recent years, in order to shorten the construction period, the concrete bridge has been erected by the reinforcing bar tip assembly that precedes the assembly of the reinforcing bar of the next block in advance when placing and curing the concrete of the block (step (1)). A construction method has been carried out (Patent Document 1: Japanese Patent Laid-Open No. 6-185018).
And, in the case of the concrete bridge erection method disclosed in Patent Document 1, a reinforcing bar assembly yard is provided on a work scaffold that is projected to the front during the concrete placement and curing of the block. In the assembly yard, the rebar assembly of the next block is preceded, or the already assembled rebar structure is lifted to that position.

  However, in the case of the concrete bridge erection method disclosed in Patent Document 1, the rebar assembly of the next block to be carried out in advance is a dedicated assembly space provided separately (position different from the position of the next block). In, it is carried out independently. Thus, the reinforcing bar structure for the next block assembled independently independently is moved to the position of the next block adjacent to the block under concrete curing. And the connection end part of the axial direction reinforcing bar which protrudes from the concrete end surface under curing and the axial direction reinforcing bar of the reinforcing bar structure for the next block are connected.

  In this case, a positional deviation is inevitably generated between the connecting end of the axial rebar and the axial rebar of the reinforcing bar structure due to variations and errors during construction or assembly, and dimensional accuracy of the parts. Therefore, if it is forcibly bound and connected, the axial rebar will meander, and the continuity and linearity of each axial rebar may be impaired and the connection strength of the axial rebar between each block may be reduced. .

  Therefore, the object of the present invention is to contribute to shortening the construction period while eliminating the decrease in the strength of connection of the axial reinforcing bars between the blocks due to the positional deviation of the axial reinforcing bars in the reinforcing bar structure between adjacent blocks. The purpose is to provide a concrete bridge erection method. Another object of the present invention is to provide a mobile work device used in the construction method.

  In order to achieve the above object, a first aspect of the present invention is a concrete bridge erection method using a reinforcing bar tip assembly in which a reinforcing bar structure for the next block is assembled prior to the completion of construction of one block. Then, by connecting the axial reinforcing bar for the next block directly to the connecting end of the axial reinforcing bar of the one block under construction and assembling the cross sectional reinforcing bar to the axial reinforcing bar, the reinforcing bar for the next block The structure is assembled at the position of the next block.

According to this aspect, the reinforcing bar structure for the next block is assembled at the position of the next block. In other words, the reinforcing bar structure for the next block is directly connected to the axial reinforcing bar for the next block at the connecting end of the axial reinforcing bar of one block under construction, and the sectional reinforcing bar is connected to the axial reinforcing bar. By assembling, it is assembled at the position of the next block.
Accordingly, there is no positional displacement of the axial reinforcing bars in the reinforcing bar structures of adjacent blocks. Therefore, it is possible to increase the connection strength of the axial rebars between the blocks and shorten the construction period at a low construction cost.

  According to a second aspect of the present invention, in the concrete bridge erection method according to the first aspect, the pre-assembly of the reinforcing bar structure of the next block is performed after the assembly of the reinforcing bar structure of the one block is completed. It is characterized by being started before installation.

  According to this aspect, in addition to the effects of the first aspect, it is possible to start the pre-assembly of the reinforcing bar structure of the next block at an early timing, and at the same time, the assembly of the reinforcing bar structures of two blocks is continuously performed. Can be done. Therefore, the efficiency of the work can be improved by continuously performing the same work, and thus the construction period can be further shortened.

  Although the construction period of the concrete bridge disclosed in Patent Document 1 can be shortened to some extent, the above-described trouble of moving the reinforcing bar structure during assembly and securing of the assembling space of the reinforcing bar structure can be ensured. There is a problem and a problem of misalignment with the connecting end portion of the axial rebar of the block. Considering work loss caused by these problems, the aspect of the present invention can further shorten the work period. it can.

  According to a third aspect of the present invention, in the concrete bridge erection method according to the first aspect, the preceding assembly of the reinforcing bar structure of the next block is performed by placing concrete on the reinforcing bar structure of the one block, It is characterized by being performed in parallel with concrete curing.

According to this aspect, in addition to the effect of the first aspect, the pre-assembly of the reinforcing bar structure of the next block is performed in parallel with the curing (hardening) of the concrete of the one block. Therefore, work efficiency can be improved by performing different processes in parallel, and the construction period can be further shortened. That is, work efficiency can be improved through effective use of waiting time for the completion of hardening due to curing of the concrete, and further shortening of the work period can be achieved.
Further, for the same reason as the second aspect, the work efficiency is better than the concrete bridge erection method disclosed in Patent Document 1, and the construction period can be further shortened.

A fourth aspect of the present invention, concrete after casting the rebar structure of one block located in the working area portion to be hung in the movable work apparatus, also the position of the next block located at the work area portion A rebar pre-assembly step of starting assembly of a rebar structure for the next block by continuing to the rebar structure from the connecting end of the axial rebar of the one block as a base point, and the concrete of the one block After the curing, the PC steel material is tensioned, and the moving work apparatus supported by the front block located upstream of the one block is placed on the one block, the reinforcing bar structure for the next block is In this position, the work area is moved together with the moving work device, and the assembly of the reinforcing bar structure for the next block is completed at the end of the moving process. And a step of completing the assembly if not, and placing the concrete on the rebar structure for the next block that has been assembled, and repeating the steps described above. It is.

  According to this aspect, similarly to each of the aspects described above, it is possible to start the pre-assembly of the reinforcing bar structure of the next block by using the waiting time for the completion of hardening by curing the concrete of the one block, and to further improve the construction period. Can be shortened. In addition, when the mobile work device moves on the one block after the concrete curing, the rebar structure for the next block remains in its position, and the work area is moved together with the mobile work device. Because it is moved to, work efficiency is good.

  In addition, after the tension of the PC steel material of the one block, the remaining block of the next block rebar structure that could not be assembled due to hindrance to the tension work of the PC steel material can be executed. It is possible to complete the assembly of the reinforcing bar structure of the next block in parallel with the assembly of the PC steel material performed prior to the tension of the steel material, and further shift to the preceding assembly of the reinforcing bar structure of the block one after another.

  In the concrete bridge erection method according to the fourth aspect, in the moving step, the formwork located in the one block can also be moved together with the moving work device.

  In this way, in the moving step, the formwork used in the one block is disassembled and moved to the next block, but the formwork moves integrally with the moving work device. By moving the moving work device from the “previous block” to the “one block”, the formwork is automatically moved from the block to the next block at the same time.

The mobile work device used in the concrete bridge erection method according to the fifth aspect of the present invention is a mobile work device used in the concrete bridge erection method having a truss structure part protruding one block forward from the leg part. the supported digits on the truss structure one block forward Ri by the truss structure, is supported further a main beam which is provided so as to protrude, by the lower digit and the main beam of the truss structure Te, one block forward Ri by the truss structure, further a sub-beams provided as projecting a work area portion which is to have hanging on the truss structure portion及 beauty main beam, movable in the sub-beams And holding means capable of holding the reinforcing bar structure, and after the assembly of the reinforcing bar structure of one block located in the work area portion is completed, At the position of the next block located in the area part, a state where the assembly of the reinforcing bar structure for the next block is started by continuing to the reinforcing bar structure from the connecting end of the axial reinforcing bar of the one block as a base point. After the concrete of the one block is cured, the mobile work device supported by the front block located on the upstream side of the one block after the PC steel material is tensioned is mounted on the one block. In addition, while moving together with the work area, the rebar structure for the next block is held by the holding means and is configured to be held in its position. Is.

  According to this aspect, the mobile work device is positioned on the front block with a simple configuration in which the main beam and the sub beam are simply attached to the truss structure portion of the mobile work device using the existing mobile work device. Thus, the concrete placement / curing of the one block and the preceding assembly of the reinforcing bar structure of the next block can be executed in parallel.

  Furthermore, when the mobile work device moves on the one block together with the work area, the reinforcing bar structure for the next block is held by the holding means and held in its position. It is configured to be realized. Therefore, the reinforcing bar structure for the next block can remain in the position of the next block while being connected to the connecting end of the axial reinforcing bar of the one block as it is. Immediately thereafter, the assembly of the incomplete reinforcing bar structure for the next block can be resumed, thereby shortening the construction period.

  According to this invention, in the construction method of a concrete bridge, the position shift of an axial direction reinforcing bar does not arise in the reinforcing bar structure of adjacent blocks. Therefore, it is possible to increase the connection strength of the axial rebars between the blocks and shorten the construction period at a low construction cost. In addition, the concrete curing (hardening) time can be effectively used to construct a concrete bridge efficiently and inexpensively, and the construction period can be greatly shortened.

It is a perspective view which shows an example of the construction condition of the construction method of the concrete bridge concerning the Example of this invention. It is a perspective view from the end part for connection of the axial direction reinforcing bar which shows the state immediately after concrete placement of one block in the construction method of the concrete bridge concerning the example of the present invention. It is a perspective view from the connection side of the axial direction reinforcement bar which shows the state where the rebar structure is pre-assembled during concrete curing of one block in the construction method of the concrete bridge concerning the example of the present invention. It is a sectional side view which shows the reinforcing bar tip assembly process of the next block in the construction method of the concrete bridge concerning the Example of this invention. It is the VV sectional view taken on the line in FIG. It is a sectional side view which shows the movement process of the PC steel material tension | tensile_strength and movement work apparatus of one block in the construction method of the concrete bridge which concerns on the Example of this invention. It is a sectional side view which shows the reinforcement block and PC steel material assembly completion process of the next block in the construction method of the concrete bridge concerning the Example of this invention. It is a sectional side view which shows the rebar pre-assembly process of a block after another in the construction method of the concrete bridge which concerns on the Example of this invention. It is a sectional side view which shows the movement process of the PC steel material tension | tensile_strength and movement work apparatus of the next block in the construction method of the concrete bridge concerning the Example of this invention. It is side sectional drawing which shows the rebar and PC steel material assembly completion process of a block one after another in the construction method of the concrete bridge concerning the Example of this invention. It is a sectional side view which shows the concrete placement and curing process of the said block in the construction method of the concrete bridge which concerns on the prior art example which does not depend on a reinforcing bar tip assembly. It is a sectional side view which shows the movement process of the PC steel material tension | tensile_strength and movement work apparatus of the said block in the construction method of the concrete bridge which concerns on the prior art example which does not depend on a reinforcing bar tip assembly. It is a sectional side view which shows the reinforcement block and PC steel material assembly process of the next block in the construction method of the concrete bridge which concerns on the prior art example which does not depend on a reinforcement reinforcement. It is explanatory drawing which shows the construction days of the construction method of the concrete bridge of this invention, and the conventional construction method which does not depend on a reinforcing bar tip as a graph.

  Hereinafter, an embodiment of a concrete bridge erection method according to the present invention will be described in detail. The outline of the structure of the mobile work apparatus 1 used when implementing the concrete bridge construction method of this invention first is demonstrated based on FIG.1 and FIG.5.

  The concrete bridge erection method of the present invention is used to construct a viaduct 3 such as a motorway provided on land as shown in FIG. 1 in addition to a concrete bridge over a river or the sea. In this type of concrete bridge erection method, a concrete cantilever concrete bridge erection method is often adopted in which the concrete bridge 7 is gradually extended left and right from the bridge pillar 5 that is set up vertically. ing. A concrete bridge moving work device 1 described below is used in this construction method.

  The illustrated concrete bridge moving work device 1 includes a rail 9 serving as a leg installed on an upper surface of a constructed concrete bridge 7 so as to extend in an overhanging direction, a moving main body 11 traveling on the rail 9, The main beam 13 and the sub beam 15 provided for the moving main body 11 and the upper and lower beams supported by the horizontal beams 6 and 10 supported by the suspension bodies 47 and 49 from the horizontal beam 2 on the moving main body 11 and the main beam 13. Like the support works 17 and 19, the work body part 21 and the work area part 21 supported by the cross beam 4 supported by the suspension body 51 from the cross beam 2 on the main beam 13 are formed. Has been.

The rail 9 is made of a shape steel material such as an H-shaped steel or an I-shaped steel, and two sets of left and right sets are provided as an example.
The moving main body 11 is configured by including a traveling body 23 traveling on the rail 9 and a pair of truss structure portions 25 supported on the traveling body 23 on the left and right. Among these, the traveling body 23 includes four traveling wheels 27 as front and rear, left and right as an example that engages with the rail 9, and a driving device 29 that transmits power to the rotation shaft of the traveling wheel 27 on the overhang side as an example. It is configured.

On the other hand, the truss structure portion 25 is a support structure having a parallelogram shape in a side view, and projects a lower girder 31 laid horizontally on the traveling body 23 and one block ahead of the lower girder 31. As described above, the upper girder 33 extends horizontally above the lower girder 31, and the inclined support frames 35 and 37 that connect the lower girder 31 and the upper girder 33.
The one block is a construction unit in which the concrete bridge 7 is sequentially projected in the projecting direction. In this specification, the block that is performing the actual construction such as concrete placement and curing is referred to as “one block”. "One block" 39, the previous block of the one block 39 is the "previous block" 41, the next block of the one block 39 is the "next block" 43, and the next block of the next block 43 is the "next block" “45” to distinguish them.

The main beam 13 is a horizontal support member that is supported by the upper girder 33 of the truss structure portion 25 and is provided so as to further protrude one block forward from the truss structure portion 25. Similarly to the rail 9, the main beam 13 is also made of a shape steel material such as H-section steel.
The sub beam 15 is a horizontal support member that is supported by the lower beam 31 of the truss structure portion 25 and the main beam 13 and is further extended one block forward from the truss structure portion 25. Similarly to the rail 9, the sub beam 15 is also made of a section steel material such as H-section steel.

The upper support 17 is disposed horizontally along the upper surface of the concrete bridge 7 and is supported by a suspension body 47 suspended from the movable body 11 and the cross beam 2 on the main beam 13. It is supported by the cross beam 6 and is provided so as to cover the area of at least the one block 39 and the next block 43 (FIGS. 4 and 5).
The supporting work 19 provided below is arranged in a somewhat inclined posture so as to follow the shape of the lower surface of the concrete bridge 7, and is suspended from the horizontal beam 2 on the moving body 11 and the main beam 13. It is supported by the cross beam 10 supported by the body 49 and is provided so as to cover at least the area of the block 39 and the next block 43 as in the upper support work 17 (FIGS. 4 and 5).

A work area 21 serving as a work scaffold is supported by a cross beam 4 supported by a suspension body 51 suspended from the cross beam 2 on the main body 13 and the main beam 13, and includes a front block 41, one block 39, and It is provided so as to cover the area of the next block 43 (FIGS. 4 and 5).
Further, the support 17 and the support 19 support the mold 53.
The sub beam 15 is provided with a support member 57 such as a chain block which is a holding means slidably in a direction along the projecting direction. The reinforcing bar structure 55 is held during or after assembly through the support member 57 such as the chain block.

[Example]
Next, based on FIGS. 1-10, the concrete bridge construction method of this invention performed by using the said concrete bridge moving work apparatus 1 is demonstrated concretely.
The concrete bridge erection method according to the present invention is a concrete bridge erection method by reinforcing bar pre-assembly, in which the reinforcement of the next block 43 is preceded before the construction of the one block 39 is completed. Then, as shown in FIG. 2 and FIG. 3, at the connection end 59 of the axial rebar 61 constituting the one block 39 under construction (FIG. 2), at the position of the next block 43, for the next block 43. The axial rebar 61 is directly bound (FIG. 3), the cross-section reinforcing bar 63 for the next block 43 is bound to the axial rebar 61, and the rebar structure 55 of the next block 43 is assembled in advance. Thus, the concrete bridge erection method of the present invention is executed.

  In this embodiment, the pre-assembly of the reinforcing bar structure 55 of the next block 43 is performed by placing concrete after the completion of the assembling of the reinforcing bar structure 55 of the one block 39, and curing the concrete (hardening process). It is designed to be executed in parallel.

  Next, the construction method of the concrete bridge according to the present embodiment is based on (1) the rebar pre-assembly process of the next block and (2) the moving work after the tension of the PC steel material of the one block based on FIGS. (3) Rebar assembly completion process of the next block, (4) Rebar pre-assembly process of the next block, (5) Transfer process of the mobile work device after tensioning the PC steel material of the next block, 6) It will be described in detail by dividing it into the rebar assembly completion process of the blocks one after another.

(1) Rebar pre-assembly process for the next block (see Fig. 4)
The reinforcing block pre-assembly process of the next block is a process of starting the assembly of the reinforcing bar structure 55 of the next block 43 directly at the position of the next block 43 after placing the concrete of the one block 39. That is, after placing concrete on the reinforcing bar structure 55 of one block 39 located in the work area part 21 suspended by the mobile work device 1, at the position of the next block 43 also located in the work area part 21, This is a step of starting assembling of the reinforcing bar structure 55 for the next block 43 in succession to the reinforcing bar structure 55 constituting the one block 39 with the connecting end 59 of the axial reinforcing bar of one block 39 as a base point.
Prior to this step, the rebar structure 55, the mold 53, and the PC steel material (not shown) of the one block 39 are assembled.

In this process, first, the rail (leg part) 9 of the mobile work device 1 is positioned on the front block 41, the formwork 53 is the one block 39, and the rebar structure 55 in the middle of the assembly is the next block. 43, respectively.
The preceding assembly of the reinforcing bar structure 55 is directly performed at the position of the next block 43 as the installation place as described above, and protrudes from the overhanging side end face 8 of the concrete bridge 7 of the one block 39 during concrete curing. This is performed using the connecting end 59 of the long and short axial reinforcing bars shown in FIG.

Specifically, as shown in FIG. 3, the axial reinforcing bar 61 for the reinforcing bar structure 55 of the next block 43 is connected to the end 59 for connecting the long and short axial reinforcing bars using a binding wire 65. The rebar structures 55 are assembled by directly binding and connecting the cross-section reinforcing bars 63 to the axial reinforcing bars 61 using the binding wires 65 at appropriate intervals.
Here, the prior assembly of the reinforcing bar structure 55 is performed as long as it does not hinder the tension work of the PC steel material performed in the next process.

(2) Moving process of the moving work device after the PC steel material tension of the one block (see FIG. 6)
The moving process of the moving work apparatus is to position the PC steel material on the front block 41 together with the formwork 53 positioned in the one block 39 after curing and hardening the concrete of the one block 39. This is a step of moving the moving work apparatus 1 that has been performed to position the mold 53 on the next block 43 and the rail 9 and the movable body 11 on the one block 39.
That is, after curing and hardening the concrete of the one block 39, the mold 53 can be disassembled and moved to the position of the next block 43, and the PC steel material of the one block 39 can be used using a jack or the like (not shown). After the tension, the one block 39 also becomes a part of the concrete bridge 7 and can withstand the load of the mobile work device 1.

Therefore, the rail 9 can be extended to the upper surface of the concrete bridge 7 constructed in the one block 39, and the traveling body 23 can be driven to move the moving body 11 by one block in the traveling direction. Then, the mold 53 supported by the supports 17 and 19 moves together with the movable body 11 to reach the next block 43 as described above.
In addition, the rebar structure 55 in the middle of assembling that has been pre-assembled in the previous step (1) remains in a position as it is held by a support member 57 such as a chain block.

(3) Rebar assembly completion process for the next block (see Fig. 7)
The rebar assembly completion process for the next block is performed by assembling the remaining rebars to the reassembled rebar that has been maintained in shape at the position of the next block 43 regardless of the movement of the movable body 11. In this process, the structural body 55 is completed and the PC steel material is assembled in parallel.
That is, after the tension of the PC steel material of the one block 39 does not interfere with the tension work of the PC steel material, the remaining reinforcing bars are assembled and the reinforcing bar structure 55 of the next block 43 is completed. In parallel with the above work, the PC steel material assembly work is executed, the mold 53 is attached, and the next concrete is placed in the mold 53 in which the reinforcing bar structure 55 is disposed.

(4) Reinforcing bar pre-assembly process of blocks one after another (see Fig. 8)
The block rebar pre-assembly process of the next block is a process of starting assembling of the rebar structure 55 of the next block 45 directly at the position of the second block 45 after placing the concrete of the next block 43.
The specific configuration of this step is the same as that in the step (1) for starting rebar pre-assembly of the next block. That is, with the connecting end 59 of the axial rebar of the reinforcing bar structure 55 constituting the next block 43 in a state where the concrete has been placed as a base point, the blocks are successively connected to the reinforcing bar structure 55 forming the next block 43. Assembling of the reinforcing bar structure 55 for 45 is started.

(5) Moving process of moving work device after tension of PC steel of next block (see FIG. 9)
The moving process of the moving work apparatus after the PC steel material tension of the next block includes the above-mentioned one frame together with the formwork 53 located in the next block 43 by tensioning the PC steel material after curing and hardening the concrete of the next block 43. In this step, the mobile work device 1 located on the block 39 is moved to place the mold 53 on the block 45 and the mobile work device 1 on the next block 43.
Since the specific configuration of this step is the same as that of the moving step (2), detailed description thereof is omitted here.

(6) Reinforcement assembly process of blocks one after another (see Fig. 10)
In the rebar assembly completion process of the blocks one after another, the rebar structure of the block 45 is assembled one after another by assembling the remaining rebars to the reassembled rebars that have been held in the blocks 45 one after another regardless of the movement of the moving body 11. 55 is a process of completing assembly of PC steel materials in parallel.
Since the specific configuration of this step is the same as the completion step (3), detailed description thereof is omitted here.

Thereafter, the steps similar to those described above are sequentially repeated to extend the concrete bridge 7 one block at a time and connect to another adjacent concrete bridge 7 to complete a series of construction work for the viaduct 3.
And according to the construction method of the concrete bridge according to the present embodiment having such a configuration, as shown in FIG. 14, the construction time is 8 days in the first block, and the construction day is 6 days in the second block and thereafter. Bridge construction work can be completed.

On the other hand, in the conventional concrete bridge erection method that does not depend on the reinforcing bar pre-assembly, the same number of construction days in the 8th day as above is required in the first block as shown in FIG. doing.
Therefore, compared to the conventional concrete bridge erection method that does not rely on reinforcing steel bars, the concrete bridge erection method of this embodiment can shorten the construction period by two days from the second block onwards, and accumulate all blocks. The construction period can be greatly shortened.

  In addition, compared with the concrete bridge erection method disclosed in Patent Document 1 below using a reinforcing bar assembling method, the problem of moving the temporarily assembled reinforcing bar structure and the end part for connecting an existing axial reinforcing bar Since there is no problem of misalignment with 59, the work loss is reduced, so that the construction period can be shortened, and the connection strength between the reinforcing bar structures 55 can be increased by connecting the axial reinforcing bars 61 without difficulty.

[Other Examples]
The concrete bridge erection method according to the present invention is based on the configuration as described above, but it is of course possible to change or omit the partial configuration within the scope not departing from the gist of the present invention. is there.

  For example, the preceding assembly of the reinforcing bar structure 55 of the next block 43 can be performed after the completion of the assembling of the reinforcing bar structure 55 of the one block 39 and before the concrete is placed. Incidentally, when the preceding assembly of the reinforcing bar structure 55 of the next block 43 is started at such timing, the work efficiency can be improved by continuously performing the same work.

In addition, the configuration of the concrete bridge moving work apparatus 1 used in carrying out the present invention is not limited to the above-described configuration, and the concrete bridges of various structures capable of preceding assembly of the reinforcing bar structure 55 in the next block 43 can be used. The mobile work device 1 can be employed.
[Industrial applicability]

  The present invention has applicability in a construction site or the like of a concrete bridge erection method using a reinforcing bar tip assembly that precedes the assembly of a reinforcing bar structure for the next block before the completion of the construction of one block.

DESCRIPTION OF SYMBOLS 1 Moving work apparatus of concrete bridge 2 Transverse beam 3 Viaduct 4 Lateral beam 5 Bridge pillar 6 Lateral beam 7 Concrete bridge 8 Overhang side end surface 9 Rail (leg part) 10 Lateral beam 11 Main body 13 Main beam 15 Sub beam 17 Supporting work 19 Supporting work 21 Working area part 23 hanging traveling body 25 truss structure portion 27 running wheels 29 driving unit 31 under the digit 33 on girder 35 inclined support frame 37 inclined support frame 39 one block 41 before blanking lock 43 primary block 45 sequentially block 47 Tsujitai 49 Holding body 51 Suspension body 53 Formwork 55 Reinforcing bar structure 57 Support material 59 such as chain block End part for connecting axial reinforcing bar 61 Axial reinforcing bar 63 Cross section reinforcing bar 65 Binding wire

JP-A-6-185018

Claims (2)

Movable work apparatus striking the concrete reinforcing steel structure of one block located in the working area portion to be hung in after casting, likewise in the position of the next block located at the work area part, the axial direction of the one block Reinforcing bar pre-assembly step that starts assembling of the reinforcing bar structure for the next block by continuing to the reinforcing bar structure from the connecting end of the reinforcing bar,
After curing the concrete of the one block, the PC steel material is tensioned, and the moving work device supported by the front block located on the upstream side of the one block is placed on the one block. A moving step of moving the work area together with the moving work device, while the reinforcing bar structure for the work remains in its position;
And when the assembly of the reinforcing bar structure for the next block is not completed at the end of the moving step, the assembly is completed.
A concrete bridge laying method characterized in that concrete is placed on the rebar structure for the next block that has been assembled and the above steps are repeated. A moving work device used in the construction method of a concrete bridge having a truss structure part protruding one block forward from the leg part,
A main beam that is supported by the upper girder of the truss structure part and is provided so as to protrude further forward by one block from the truss structure part;
A sub beam that is supported by the lower beam of the truss structure portion and the main beam, and is provided so as to protrude further forward by one block from the truss structure portion;
A work area suspended from the truss structure and the main beam;
A holding means provided movably on the sub-beam and capable of holding a reinforcing bar structure;
After the assembly of the reinforcing bar structure of one block located in the work area part, at the position of the next block which is also located in the work area part, the connecting end of the axial reinforcing bar of the one block is used as a base point. Realize the state where the assembly of the reinforcing bar structure for the next block is started in succession to the reinforcing bar structure, and after curing the concrete of the one block, after tensioning the PC steel material, the upstream side of the one block The moving work apparatus supported by the front block located at the position moves together with the work area on the one block, and the reinforcing bar structure for the next block is held by the holding means and A mobile work device used in a concrete bridge erection method, characterized in that it is configured to be held in its position.

Images