JPH11256521A - Bridge erection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the period of work execution and to enhance profitability when using a bridge erection device designed to extend a bridge girder through the execution of the work of overhanging the girder. SOLUTION: A scaffold form 12 is formed into a movable structure and can convey a prefabricated reinforcing cage 4 to a concrete placing position A; i.e., after a chain 32 suspending and supporting the scaffold form 12 by a wagen 14 (cantilever erection working vehicle) is drawn out to lower the scaffold form 12 down to a retreat position below the concrete placing position A, the reinforcing cage 4 held suspended is conveyed to the end of a bridge girder 2 by a pair of right and left reinforcing cage conveying trucks 68 being movable in the direction of a bridge axis and is placed on the scaffold form 12 located at the retreat position. Thereafter, the wagen 14 is moved to the end of the bridge girder 2 and then the scaffold form 12 is raised to the concrete placing position A so as to move the reinforcing cage 4 to the concrete placing position A at the same time. Therefore, reinforcement assembly work that was usually performed at the concrete placing position A is disused and prefabrication is made possible either completely or except for part of joint work execution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge erection apparatus configured to extend a bridge girder by an overhang erection method.

[0002]

2. Description of the Related Art Conventionally, an overhanging erection method has been known as an erection method for a large-stress prestressed concrete bridge.

[0003] This overhanging erection construction method uses a cantilever erection work vehicle that suspends and supports a scaffold formwork (working scaffold and formwork), and casts new concrete at the tip of the bridge girder under construction to form the bridge girder. Is an extension method, and specifically, the construction is performed in the following procedure.

[0004] That is, first, after the work is completed at the preceding concrete pouring position, the wagen is moved forward in the bridge axis direction and installed at the tip of the bridge girder, and then the outer formwork is set at the concrete pouring position. To connect the lower slab reinforcing bar set, web reinforcing bar set and sheath, and set the inner formwork to perform the upper slab reinforcing bar set, the horizontal tightening steel material arrangement and the sheath connection, and then cast and cure concrete. After that, the tension and release of the PC steel material are performed.

[0005]

However, in the above-mentioned conventional overhanging construction method, the scaffold form is suspended and fixed to the wagen, and the reinforcing bar work is performed at the concrete placing position. Therefore, it is possible to partially prefabricate the rebar, but it cannot be prefabricated completely or with some joints left. For this reason, the construction requires a considerably long time, and the construction cost is high.

The present invention has been made in view of such circumstances, and aims at shortening the construction period and improving economic efficiency in a bridge erection apparatus configured to extend a bridge girder by overhang erection construction. It is an object of the present invention to provide a bridge erection device capable of performing the above.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a scaffold form is made to have a movable structure and a prefabricated rebar cage can be transported to a concrete casting position while completely or partially connecting a joint. By doing so, the object is achieved.

That is, the bridge erection apparatus according to the present invention uses a cantilever erection work vehicle that suspends and supports a scaffolding formwork and applies new concrete to the tip of a bridge girder under construction. In a bridge erection device for casting and extending the bridge girder, a scaffolding form moving means for moving the scaffolding form between a concrete placing position and a retracted position deviating from the concrete placing position; Rebar cage transport means for suspending the rebar cage at the rebar cage supply position, and transporting the rebar cage to the concrete placing position;
It is characterized by comprising.

The "retreat position" is not limited to a specific position as long as it is a position deviating from the concrete placing position.

[0010] The above-mentioned "rebar basket" means that all or some of the rebars are assembled in advance.

The "rebar cage transport means" may be configured to transport the rebar cage to the concrete placing position by a single means, or to transport the rebar basket halfway by the first means. It may be configured to be transported to the concrete placing position by being suspended by the second means (or further suspended by the third means or the like). In the latter case, the scaffolding form moving means may be used as the second means (or the third means or the like).

The "predetermined rebar basket supply position" is not limited to a specific position as long as the rebar cage can be suspended and transported to the concrete placing position. For example, a rebar cage assembly yard installed near the pier or a position on a rail laid below the concrete placing position can be adopted.

[0013]

As described above, in the bridge erection apparatus according to the present invention, the scaffold form suspended and supported by the cantilever erection work vehicle is provided by the scaffold form moving means. Position and the retreat position, and the rebar cage is transported from the rebar cage supply position to the concrete placing position by the rebar cage transport means. The following operational effects can be obtained.

That is, with the scaffold form moved to the retracted position, the rebar cage is transported from the rebar cage supply position to the concrete placement position, and then the scaffold form is moved to the concrete placement position. If it is returned to the position, it is possible to abolish the rebar assembling work conventionally performed at the concrete pouring position, and to make it prefabricated completely or partially with the joint construction remaining. For this reason, construction can be performed in a short time and at low cost.

Therefore, according to the present invention, in a bridge erection apparatus configured to extend a bridge girder by overhang erection construction, it is possible to shorten the construction period and improve the economic efficiency.

In the above construction, if the rebar cage transport means is provided with a bridge axis direction moving means for transporting the rebar cage forward in the bridge axis direction as described in claim 2, the rebar cage cage is provided. Can be easily transported from the reinforced cage assembly yard or the like installed near the pier to the concrete placing position.

In the above configuration, as described above, the "evacuation position" is not limited to a specific position. If the scaffolding form moving means is set at a position below the installation position, the scaffolding form moving means can have a simple configuration, and as described in claim 6, the "retreat position"
Is set at a position in front of the concrete placing position in the bridge axis direction, the scaffold form can be easily retracted even when there is not enough space below the concrete placing position.

In the case where the "retreat position" is set at a position below the concrete placing position, the construction of the rebar cage transport means may be as follows.
It is possible to adopt a configuration in which the rebar cage is suspended from the bridge axis direction moving means to the scaffold form moving means in the middle of the conveyance, and by doing so, the scaffold form moving means can be transferred to the rebar cage conveying means. It can be used as a part of the means, and the configuration of the bridge erection device can be simplified.

[0019] In this case, the rebar cage may be suspended after the rebar cage is conveyed to the tip of the bridge girder by the bridge axis direction conveying means.
If the rebar cage is placed on the scaffold form at the retreat position and the suspension of the rebar cage with respect to the bridge-axis-direction transport means is released, the rebar cage is suspended. Work efficiency can be increased, and
By the operation of moving the scaffold form to the concrete placement position, the rebar cage can be simultaneously moved to the concrete placement position, and also in this respect, the working efficiency can be improved.

It should be noted that, when any of the above configurations is adopted, it does not become a factor that determines the capability of the cantilevered work vehicle.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.

First, a first embodiment of the bridge erection apparatus according to the present invention is described.
An embodiment will be described.

FIG. 1 shows a bridge erection apparatus 1 according to this embodiment.
FIG. 2 is a side view of FIG.
The right half thereof is a view taken along line IIb-IIb in FIG. 1.

As shown in these figures, the bridge erection apparatus 10 is provided with a wedge 14 for suspending and supporting a scaffold formwork 12.
A new concrete is cast at the tip of the bridge girder 2 under construction by using (a cantilevered work vehicle) to extend the bridge girder 2.

The wagen 14 includes a pair of left and right diamond-shaped main frames 16 which are installed so as to protrude forward in the bridge axis direction at the front end of the bridge girder 2, and the upper ends of the pair of main frames 16 are provided with the bridge shafts. The main frame 16 is provided with a pair of front and rear cross beams 18A and 18B extending in a horizontal direction perpendicular to the direction.

Each of the main frames 16 is connected to the bridge girder 2.
It is placed on a rail 20 laid on the upper surface 2a of the vehicle, and is configured to be able to move on the rail 20 in the bridge axis direction by driving a motor 22. Each of the main frames 16 is supported by the bridge girder 2 by a main jack 24 at a lower front end thereof, and is restrained by an anchor member 26 at a lower rear end thereof by an anchor jack 28 in a state where it is prevented from jumping up. It is supported by the bridge girder 2.

A chain 32 is suspended and supported at both left and right ends of each of the cross beams 18A and 18B via an electric chain block 30. Further, a channel having a predetermined length is arranged adjacent to the outside of the chain 32. A material 34A is suspended and supported.

The scaffold formwork 12 includes a work scaffold 36, form receiving members 38 and 40 supported by the work scaffold 36,
An outer mold frame 42 supported by these mold receiving members 38 and 40 is provided.

The work scaffold 36 is provided with each of the cross beams 18A,
A pair of front and rear cross beams 44A, 44B having the same shape as that of the pair of cross beams 18A, 18B, and a grid-like scaffold member 46 horizontally disposed near the lower portion of the pair of cross beams 44A, 44B. , 48, and are connected to the lower end of the chain 32 at both left and right ends of each of the cross beams 44A, 44B.
A and 18B suspend and support. Also,
Short channel members 34B are fixed to the left and right ends of each of the cross beams 44A and 44B so as to be located directly below the respective channel members 34A so as to protrude upward. The chain 32 is wound up by the drive of the electric chain block 30 so that the scaffolding form 12 is placed in the concrete placing position A.
When it rises, it is connected and fixed to the lower end portion of each of the channel members 34A by pin connection, whereby the scaffolding formwork 12 is positioned at the concrete placing position A.

Further, a pair of left and right height adjusting mechanisms 50 is attached to the cross beam 18A on the front side of the wagen 14. Each of these height adjustment mechanisms 50 is connected to the horizontal beam 18.
A, a frame 52 suspended and fixed to
And a pair of channel materials (or P) suspended from and supported by the frame 52.
C steel bar) 56A. When the scaffolding formwork 12 rises to the concrete placing position A, the pair of short channel materials 5A fixed to the cross beam 44A on the front side of the scaffolding formwork 12 are formed.
6B and fixed by pin connection. Then, by driving the height adjustment jack 54 in a state where the connection and fixing are performed, the suspension support height position of the pair of channel members 56A with respect to the frame 52 is adjusted, that is, the scaffold formwork is adjusted. Twelve height positions are adjusted.

Outside the height adjusting mechanisms 50 on the front cross beam 18A, when the scaffold form 12 is raised to the concrete placing position A, it is connected to the front end of the form receiving member 38. A pair of suspension members (deformed PC steel bars) 60 for suspending and supporting the form receiving member 38 are suspended and fixed. A pair of suspension members (irregular PC steel bars) 62 are also suspended and fixed inside each of the height adjustment mechanisms 50 in the cross beam 18A. When the scaffolding form 12 is raised to the concrete placing position A,
The form receiving member 66 that supports the inner form 64 is connected to the front end of the form receiving member 66 to suspend and support the form receiving member 66. When the scaffold form 12 is raised to the concrete placement position A, the form receiving member 66 is extended by a predetermined amount from the lower surface of the upper floor of the bridge girder 2 to the front in the bridge axis direction.

The above-mentioned bridge erection apparatus 10 is provided with
4, a pair of left and right rebar cage transport vehicles 68 is provided.

Each of the rebar cage transport vehicles 68 is mounted on a rail 70 laid so as to be located outside the rail 20 on the upper surface 2a of the bridge girder 2 and mounted on the rebar cage transport vehicle 68. It is configured to be able to travel on the rail 70 in the bridge axis direction by the driving of the motor 72 thus performed. The upper member of each of the rebar cage transport vehicles 68 extends beyond the side edge of the bridge girder 2 at the front and rear two places, and the side end of each of the upper members has an electric chain block. Each of the chains 76 is suspended and supported via 74. These front and rear chain 7
6 are connected to both ends of a pair of front and rear reinforced cage support beams 78 extending in the horizontal direction orthogonal to the bridge axis direction.

A plurality of suspending members 80 are suspended and supported at predetermined intervals on each of the reinforcing bar cage supporting beams 78. The reinforcing bars 4 are suspended and supported at the lower ends of the respective suspending members 80. I have. The rebar cage 4 is assembled in advance in a rebar cage assembly yard installed near the pier at the base end of the bridge girder 2, and is suspended by the pair of rebar cage carriers 68. While being supported below, the bridge girder 2 is transported forward along the bridge axis along the vicinity of the lower surface of the bridge girder 2.

The rebar cage 4 is placed on the outer formwork 42 of the scaffold formwork 12 after the rebar car carrier 68 has moved to the tip of the bridge girder 2 as described later. The rebar cage support structure for positioning and supporting the rebar cage 4 at the concrete placement position A is provided in the wagen 14, while being moved to the concrete placement position A together with the outer formwork 42. Is provided.

That is, both cross beams 18 of the wagen 14
A pair of beams 82 extending in the bridge axis direction are provided on the lower surfaces near the left and right ends of A and 18B. Each of these beams 82
Upper member 16 of each main frame 16 of the wagen 14
It is formed so as to protrude to the rear from a. A pair of suspension hooks 84 are attached to each of the beams 82 so as to be movable in the bridge axis direction, and the rebar cage moved to the concrete placing position A by these suspension hooks 84. 4 is suspended and supported via suspending members (this will be described later).

Next, the steps of the overhanging erection by the bridge erection apparatus 10 will be described with reference to FIGS.

First, as shown in FIG. 3, when concrete is placed at the preceding concrete placing position Ao, after the concrete is cured, the PC steel is tensioned and released. Then, each of the channel materials 34A
And the connection with the short channel material 34B is released.

Next, as shown in FIG. 4, the chain 32 is extended by driving the electric chain block 30, and the scaffold form 12 is lowered by a predetermined amount. On the other hand, after the rail 70 is extended and laid to the tip of the bridge girder 2, the pair of rebar cage transport vehicles 68 that suspend and support the rebar cage 4 move forward in the bridge axis direction.

As a result, as shown in FIG. 5, the two rebar cage carriers 68 are connected to the outer frame 4 at the tip of the bridge girder 2.
2, the chain 76 is extended by driving the electric chain block 74 (see FIG. 2), and the rebar cage 4 is lowered.

Then, as shown in FIG. 6, when the rebar cage 4 is lowered to the position where it is placed on the outer mold frame 42, the respective hanging members 80 are removed from the rebar cage 4 and The chain 76 is wound up, and the two rebar cage transport vehicles 68 move rearward in the bridge axis direction toward the rebar cage supply position near the pier.

Next, as shown in FIG.
4 moves forward in the bridge axis direction and is installed at the tip of the bridge girder 2. Thereafter, the drive of the electric chain block 30 winds up the chain 32 and raises the scaffolding formwork 12. At this time, the scaffold formwork 12
The rebar cage 4 placed on the scaffold form 12 is also raised together with the scaffold formwork 12.

As a result, as shown in FIG. 8, when the scaffold formwork 12 and the reinforcing bar 4 are raised to the next concrete placing position A1, each of the channel members 34A and each of the short channel members 34B are formed. Are connected, and the scaffold form 12 is moved to the concrete placing position A1.
Is positioned. Next, the rebar cage 4 is suspended from the suspension hooks 84 via suspension members 86, and set at a predetermined position of the concrete placing position A1. Further, the outer mold frame 42 is also set at a predetermined position of the concrete placing position A1, and the rebar assembly, the lateral tightening position adjustment and the sheath connection of the joint portion are performed. Further, the inner mold 64
(See FIG. 2) is also set at a predetermined position of the concrete placing position A1. In this state, concrete is poured at the concrete placing position A1. That is, the state returns to the state similar to that in FIG.

As described in detail above, the bridge erection apparatus 10 according to the present embodiment includes the
4 is extended by driving the electric chain block 30, and the scaffold form 12 is moved to a retracted position below the concrete placing position A, and then moved in the bridge axis direction. In a state where the rebar cage 4 is suspended by the pair of left and right rebar cage transport vehicles 68, the rebar cage 4 is transported from the rebar cage assembly yard near the pier to the tip of the bridge girder 2, and the rebar cage 4 is removed. After placing on the scaffold formwork 12 at the retracted position, and then moving the wagen 14 to the tip of the bridge girder 2,
By raising the scaffolding formwork 12 to the concrete placing position A, the rebar cage 4 is also moved to the concrete placing position A at the same time. The rebar assembling work that has been performed can be abolished, and this can be completely or partially prefabricated while leaving some joint work. For this reason, construction can be performed in a short time and at low cost.

Therefore, according to the present embodiment, in the bridge erection apparatus configured to extend the bridge girder by the overhang erection construction, it is possible to shorten the construction period and improve the economic efficiency.

Further, in the present embodiment, since the retracted position is set at a position below the concrete placing position A, the electric chain block 30 is simply provided on the wagon 14 in a simple structure. Thus, the scaffold formwork 4 can be moved.

Further, in the present embodiment, the rebar cage 4 is mounted on the front end of the bridge girder 2 from the rebar cage assembly yard by employing the pair of rebar cage carriers 68 to which the electric chain block 74 is attached. Can be transported easily.

Further, in the present embodiment, the rebar cage 4 is placed on the scaffolding formwork 12 at the retracted position, and the rebar cage transport vehicles 68 for the rebar cage 4 are placed.
Is released, the rebar cage 4 is suspended from the rebar cage transport vehicle 68 to the wagen 14, so that the electric chain block 30 for scaffolding formwork transfer is rebar transported. The bridge erection device 1 can be used as a part of
0 can be simplified. Also, since the rebar cage 4 can be simultaneously moved to the concrete placing position A by the operation of moving the scaffold formwork 12 to the concrete placing position A, the working efficiency is extremely high. Can be.

Next, the second embodiment of the bridge erection apparatus according to the present invention will be described.
An embodiment will be described.

FIG. 9 shows a bridge erection apparatus 1 according to this embodiment.
FIG.

As shown, the bridge erection device 110
In the same manner as in the bridge erection apparatus 10, a new concrete is cast at the tip of the bridge girder 2 under construction by using the wagen 114 for suspending and supporting the scaffold formwork 112, and the bridge girder 2 is extended. ing.

The basic structure of the wagen 114 is the same as that of the wagen 14, except that a pair of right and left rhombus-shaped main frames 116 each have an overhanging beam 188 projecting forward in the bridge axis direction. A rail 190 is laid on the upper surface of each of the overhang beams 188.
The pair of front and rear cross beams 118A and 118B are placed on the rail 190 in a state where they are connected by a connecting member 192 extending in the bridge axis direction, and can slide in the bridge axis direction by driving means (not shown). ing.

The scaffold form 112 is formed by the scaffold form 12.
The configuration is substantially the same as that of the first and second cross beams 118A and 118.
A pair of front and rear channel materials 1 suspended at both ends of B
By means of 94, it is always held at the same height position as the concrete placing position A.

Then, in the wagen 114,
By sliding the cross beams 118A and 118 in the bridge axis direction, the scaffold form 112 can be moved between the concrete placing position A and the retreat position in front of the concrete axis position in the bridge axis direction. .

The bridge erection device 110 according to the present embodiment also
Similar to the bridge erection apparatus 10, there is provided a pair of left and right rebar cage transport vehicles 168 for transporting the rebar cage 4 from the rebar cage assembly yard near the pier to the concrete placing position A. The configuration of the vehicle 168 is exactly the same as that of each of the rebar cage transport vehicles 68 described above.

Next, the steps of the overhanging erection by the bridge erection apparatus 110 will be described with reference to FIGS.

First, as shown in FIG. 10, when concrete is poured at the preceding concrete placing position Ao, the concrete is cured, and then the PC steel is tensioned and released.

Next, as shown in FIG.
18A and 118B slide forward in the bridge axis direction, and the scaffold form 112 is moved to the retracted position. On the other hand, after the rail 170 is laid on the bridge girder 2 to extend to the tip of the bridge girder 2, the above-mentioned 1
The pair of rebar cage carriers 168 moves forward in the bridge axis direction.

As a result, as shown in FIG. 12, when the two rebar cage carriers 168 move to the tip of the bridge girder 2, the chains 17 suspending the rebar cage 4 move.
6 is removed from the both-rebar cage transport vehicle 168.

As shown in FIG. 13, the rebar cage 4 is attached to a chain 186 suspended by two hanging hooks 184 in front and behind each beam 182 of the wagen 114. When the rebar cage 4 is suspended in this manner, the two rebar cage carriers 168 move rearward in the bridge axis direction toward the rebar cage supply position near the pier.

Next, as shown in FIG. 14, the wagon 114 moves forward in the bridge axis direction and is installed at the tip of the bridge girder 2. Thereafter, the chain is driven by an electric chain block (not shown). 186 is wound up,
The rebar cage 4 is raised.

As a result, as shown in FIG. 15, when the rebar cage 4 is raised to a predetermined position of the next concrete placing position A1, the two cross beams 118A and 118B are raised.
Slides backward in the bridge axis direction.

When the scaffold form 112 is positioned at the concrete placing position A1 by the slide as shown in FIG. 16, the outer form 142 is set at a predetermined position of the concrete placing position A1. Then, the rebar assembly of the joint portion, the lateral tightening position adjustment, and the sheath connection are performed.
Further, the inner formwork (see the inner formwork 64 in FIG. 2) is also set at a predetermined position of the concrete placing position A1. In this state, concrete is poured at the concrete placing position A1. That is, the state returns to the state similar to that of FIG.

As described in detail above, in the bridge erection apparatus 10 according to the present embodiment, the scaffold form 112 is retracted forward of the concrete placing position A in the bridge axis direction by sliding the both cross beams 118A and 118B. After moving to the position,
The pair of left and right rebar cage carriers 1 movable in the bridge axis direction
According to 68, the suspended cage 4 is transported from the rebar cage assembly yard near the pier to the tip of the bridge girder 2 in a suspended state, and the rebar cage 4 is suspended by the wagen 114 and then 14 is moved to the tip of the bridge girder 2 and then the rebar cage 4 is raised to the concrete placement position A, and then the scaffold form 112 is returned to the concrete placement position A. Therefore, the rebar assembly work conventionally performed at the concrete placing position A can be abolished, and this can be prefabricated completely or with some joints left. For this reason, construction can be performed in a short time and at low cost.

Therefore, according to the present embodiment, in the bridge erection apparatus configured to extend the bridge girder by the overhang erection construction, it is possible to shorten the construction period and improve the economic efficiency.

Further, in the present embodiment, the retreat position is set at a position in front of the concrete placing position A in the bridge axis direction, so that there is no sufficient space below the concrete placing position A. Also, the scaffold form 112 can be easily retracted to a position where it does not hinder the conveyance of the rebar cage 4.

In the present embodiment, as in the first embodiment, the pair of rebar cage carriers 168 to which the electric chain hoist block 174 is attached is used to move the rebar cage 4 from the rebar cage assembly yard. The above bridge girder 2
Can easily be conveyed to the front end.

By the way, in the second embodiment,
While the rebar cage 4 is suspended, the rebar cage 4 is moved from the rebar cage assembly yard near the pier to the concrete placing position A.
Although the example of the overhang erection construction configured to be transported to the pier has been described, the bridge erection apparatus 1 according to the second embodiment is
By using 10, it is also possible to perform an overhanging erection construction as shown in FIG.

That is, as shown in the drawing, the sliding of the cross beams 118A and 118B causes the scaffold form 1 to slide.
12 is moved to a retracted position in front of the concrete placing position A in the bridge axis direction, and then each beam 18 of the wagen 114 is moved.
The chain 186 suspended by the two suspension hooks 184 before and after 2 is extended long, the reinforcement cage 4 is suspended at the reinforcement cage supply position immediately below the concrete placing position A, and the chain 186 is wound up. Thereby, the rebar cage 4 can be raised to the concrete placing position A, and then the scaffold form 112 can be returned to the concrete placing position A.

By adopting such a construction method, similarly to the construction method of the second embodiment, the rebar assembling work conventionally performed at the concrete placing position A is abolished and completely or completely. It can be prefabricated while leaving some joint construction. Moreover, by adopting such a construction method, the construction process is extremely simplified, so that the construction can be performed in a short time and at low cost.

The rebar cage supply position immediately below the concrete placing position A gradually changes forward in the bridge axis direction as the construction of the bridge girder 2 proceeds, but the rail is laid and the rebar cage is placed thereon. By mounting the supply cart, it is possible to cope with the change in the rebar basket supply position.

[Brief description of the drawings]

FIG. 1 is a side view showing a bridge erection apparatus according to a first embodiment of the present invention.

FIG. 2 is a view taken along the line IIa-IIa in FIG. 1, and a right half is a view taken along the line IIb-IIb in FIG.

FIG. 3 is a process chart showing a procedure of the overhanging erection construction by the bridge erection apparatus (part 1).

FIG. 4 is a process chart showing a procedure of the above-mentioned overhanging construction (part 2).

FIG. 5 is a process diagram (part 3) showing the procedure of the overhanging erection construction.

FIG. 6 is a process chart showing a procedure of the above-mentioned overhanging construction (part 4).

FIG. 7 is a process diagram (part 5) showing a procedure of the overhang erection construction.

FIG. 8 is a process chart showing the procedure of the above-mentioned overhanging erection construction (part 6).

FIG. 9 is a side view showing a bridge erection apparatus according to a second embodiment of the present invention.

FIG. 10 is a process chart showing the procedure of the overhanging erection construction by the bridge erection apparatus (part 1).

FIG. 11 is a process diagram (part 2) showing the procedure of the overhang erection construction.

FIG. 12 is a process diagram (part 3) showing the procedure of the overhanging erection construction.

FIG. 13 is a process diagram (part 4) showing a procedure of the overhang erection construction.

FIG. 14 is a process diagram (part 5) showing the procedure of the overhanging erection construction.

FIG. 15 is a process chart showing a procedure of the above-mentioned overhanging erection construction (part 6).

FIG. 16 is a process diagram (part 7) showing a procedure of the overhang erection construction.

FIG. 17 is a side view showing another example of overhanging erection construction by the bridge erection device according to the second embodiment.

[Explanation of symbols]

2 Bridge girder 2a Upper surface 4 Reinforced cage 10 Bridge construction device 12 Scaffolding formwork 14 Wagen (cantilever construction work vehicle) (reinforcement cage transport means) 16 Main frame 18A, 18B Cross beam 20 Rail 22 Motor 30 Electric chain block (scaffolding form movement Means) (rebar cage transport means) 32 chain 34A channel material 34B short channel material 36 work scaffold 38, 40 formwork receiving material 42, outer formwork 44A, 44B beams 46, 48 lattice-like scaffold member 50 height adjusting mechanism 52 frame 54 Height adjustment jack 56A Channel material 56B Short channel material 60, 62 Suspended material (deformed PC steel bar) 64 Inner formwork 66 Formwork receiving material 68 Reinforced cage transport vehicle (bridge axis transport means) (rebar cage transport means) 70 rail 72 motor 74 electric chain block 76 chain 78 iron Cage support beam 80 Suspension member 82 Beam 84 Suspension hook 86 Suspension member 110 Bridge erection device 112 Scaffolding formwork 114 Wagen (cantilever construction work vehicle) (rebar cage transportation means) 116 Main frame 118A, 118B Cross beam (scaffolding form movement) Means) 142 Outer formwork 164 Inner formwork 168 Reinforced cage transport vehicle (bridge axis transport means) (Reinforcement cage transport means) 170 Rail 184 Hanging hook 186 Chain 188 Overhang beam 190 Rail 192 Connecting material 194 Channel material A Concrete Casting position Ao Precast concrete casting position A1 Concrete casting position

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshifumi Ochi 13-4 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd.

Claims (6)

[Claims] 1. A bridge erection apparatus that uses a cantilever erection work vehicle that suspends and supports a scaffolding formwork, places new concrete on the tip of a bridge girder under construction, and extends the bridge girder. Scaffolding form moving means for moving the frame between a concrete placing position and a retreat position deviating from the concrete placing position; suspending the reinforcing bar at a predetermined reinforcing bar supply position; A bridge erection device, comprising: a reinforced cage transport means for transporting to a concrete placing position. 2. The bridge erection apparatus according to claim 1, wherein said reinforcing bar transporting means comprises a bridge axial transporting means for transporting said reinforcing cage forward in the bridge axial direction. 3. The bridge erection apparatus according to claim 2, wherein the retracted position is set at a position below the concrete placing position. 4. The rebar cage transport means is configured to suspend the rebar cage from the bridge axis direction transport means to the scaffold form moving means during transport. The bridge erection device as described. 5. The suspension of the rebar cage is carried out by transporting the rebar cage to a tip end of the bridge girder by the bridge axial transport means, and then placing the rebar cage on the scaffold form at the retracted position. 5. The bridge erection apparatus according to claim 4, wherein the bridge erection apparatus is configured to release the rebar cage from the suspended state with respect to the bridge axis direction transport means. 6. The bridge erection apparatus according to claim 1, wherein the retreat position is set at a position in front of the concrete placing position in a bridge axis direction.