JP2001020226A - Conveying method of corrugated steel plate web member in bridge construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently convey corrugated steel plate web members without fear that a warp arises or buckling occurs in a overhung section of a completed bridge when a corrugated steel plate web PC bridge is constructed. SOLUTION: A corrugated steel plate web member 11 hung up on a bridge pier is placed so that the side face is positioned at right angles against the surface of a floor slab 5 and the upper end edge and the lower end edge are transferred to the overhung position of an existing bridge girder in a state that they make right angles to the surface of the floor slab 5. Then, after the side face is arranged at right angles to the axial line of the bridge, it is turned 90 degrees while supporting the upper end and revolved to set it in a specified position between the upper frame and the lower frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a corrugated steel web prestressed concrete bridge (hereinafter referred to as "corrugated steel web PC").
(Hereinafter referred to as "bridge").

[0002]

2. Description of the Related Art Conventionally, in a prestressed concrete box girder bridge, as shown in FIG. 6, instead of a concrete web, as shown in FIG. A corrugated steel sheet web PC bridge using the corrugated steel sheet webs 1, 1 has been implemented.

[0003] This corrugated steel sheet web PC bridge aims to reduce the weight of the main girder by using the corrugated steel sheets 1 and 1 for the web, thereby increasing the length of the span and reducing the cost.

[0004] The corrugated steel web PC bridge is used in a mobile work vehicle arranged on both sides of a pier to assemble a formwork, arrange rebars and PC steel bars, place concrete, and reduce prestress after curing. This cycle is constructed by a so-called cantilever construction method (a cantilever) in which the introduction is performed integrally and the work vehicle is sequentially advanced to extend the girder.

At this time, as shown in FIG. 7, the corrugated steel sheet web comprises a plurality of corrugated steel sheet web members 11 which are appropriately divided in the vertical direction according to the width required for one cycle corresponding to the formwork, for example. The corrugated steel sheet web conveying device 32 suspended so as to run on a main frame 31 extending in a bridge axis direction provided on a frame 3 having a gate shape of the movable work vehicle 2 and provided in a bridge axis direction is sequentially conveyed to an arrangement position on a form 4. It is fixedly connected to the lower frame 42, casts concrete, and sequentially builds up the girder to build.

[0006]

However, the mobile work vehicle 2 used for constructing the conventional corrugated steel sheet web PC bridge includes a plurality of corrugated steel sheet web members 11 which are appropriately divided in the vertical direction. That is, the main frame 31 is suspended from the main frame 31 in a state where the upper and lower directions are kept aligned, advances to the installation position, and is lowered and arranged at a predetermined position.

[0007] Therefore, the main frame 31 must be located at least above the height h of the corrugated steel sheet web member 11 from the surface 51 of the concrete upper slab 5, and the frame 3 is supported by the reinforced frame 32 having a height. As a result, the overall height of the mobile work vehicle 2 increases.

Accordingly, the mobile work vehicle 2 travels in an unstable manner, making it difficult to carry out the work, especially when the corrugated steel sheet web member 11 having a high and heavy weight is suspended.

Also, the provision of the tall extension frame 32 increases the weight of the mobile work vehicle 2, and depending on the increased weight, there is a possibility that the overhanging portion of the completed bridge may be bent or buckled. It will also be.

Further, the corrugated steel sheet web member 11 must be conveyed while being suspended from the main frame 31 arranged at a high position, and there is a problem that the work efficiency is extremely low.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a problem thereof is that when a corrugated steel web PC bridge is constructed, the overhanging portion of the completed bridge is bent.
Another object of the present invention is to provide a method of transporting a corrugated steel sheet web member that is excellent in workability without fear of buckling or the like.

[0012]

In order to solve the above-mentioned problems, the present invention provides a corrugated steel sheet web member suspended on a pier, the side of which is perpendicular to the surface of the floor slab, and the upper edge and After transferring the lower edge to the overhang position of the ready-made bridge girder at a right angle to the surface of the floor slab and making the side surface perpendicular to the bridge axis direction, rotate the upper end by 90 degrees while rotating it by 90 degrees. It was conveyed to a predetermined position between the upper frame and the lower frame.

The corrugated steel sheet web member is conveyed to a girder overhang position in a state where the side surface thereof is perpendicular to the surface of the floor slab and the upper and lower edges are perpendicular to the surface of the floor slab. Since the corrugated steel sheet web member is conveyed to the position where the girder is extended at the height of the division width, the extension frame of the mobile work vehicle can be lowered.

Therefore, the mobile work vehicle can be run very easily in a stable state, and even if the extension frame is provided, the weight of the mobile work vehicle is small, and the overhanging portion of the completed bridge bends. In addition, there is no fear of buckling or buckling, and the corrugated steel sheet web member is not transported in a suspended state at a high position of the mobile work vehicle, so that the work efficiency is extremely good.

[0015]

Next, an embodiment of the present invention will be described.

FIGS. 1 to 5 show an example of a mobile work vehicle 2 used for carrying out the present invention. The mobile work vehicle 2 transports a corrugated steel sheet web member by assembling a mold. Placement of steel bars and PC steel rods, concrete placement,
The introduction of prestress after curing can be performed integrally.

The mobile work vehicle 2 has a frame 3 having a gate-shaped front surface. The frame 3 has a predetermined interval on the surface of the upper slab 51 of the slab 5 provided on a pier (not shown). And a rectangular frame-shaped base 3a having a moving roller 34 movably fitted to a pair of rails 531 and 53 installed in the bridge axis direction, and a formwork 4 projecting above a front portion of the base 3a. And an overhanging portion 3b for hanging the same.

A rack 5 provided on the rails 53 along the length direction is provided on the base 3a of the frame 3.
A drive device 35 having a pinion meshed with 4 is disposed, and the drive device causes the frame 3 to travel in the bridge axis direction.

Further, on the upper part of the base 3a of the frame 3,
A main frame 31 extending in the bridge axis direction is disposed at the center in the bridge width direction.

As shown in FIG. 3, the main frame 31 has a leading end reaching the vicinity of the center of the overhang portion 3b in the bridge axis direction, and has a substantially T-shaped branch at both ends in the width direction through curved portions 312 and 312. are doing.

A corrugated steel sheet web member conveying device 33 is suspended from the main frame 31 so as to be able to run in the bridge axis direction.

As shown in FIG. 4, this corrugated steel sheet web member conveying device 33 has a cross beam member 332 extending in the bridge axis direction provided with suspension members 331 and 331 to the main frame 31 at the front end and the rear end. And a vertical girder member 333 hanging down at the tip of the horizontal girder member 332.
The chain blocks 334 and 335 are provided at the rear end of the second girder 2 and the upper end of the girder member 333.
Reference numeral 33 denotes a corrugated steel sheet web member 1 that can be turned and rotated.
One support mechanism 336 is provided.

The support mechanism 3 for the corrugated steel sheet web member 11
Reference numeral 36 denotes a fitting groove 337 extending to the vicinity of the lower end along the axis of the stringer member 333, and a corrugated steel web gripper 338 rotatably and slidably fitted in the groove.

In the drawings, reference numeral 36 denotes a chain block for receiving a signal from the truck 6 installed at the rear end of the main frame 31.

As shown in FIG. 5A, the corrugated steel sheet web member 11 hung on the pier is formed by moving the corrugated steel sheet web member 11 so that its side surface is perpendicular to the surface of the upper floor slab 51 and the upper edge thereof. In a state where the lower end 111 and the lower edge 112 are perpendicular to the surface of the upper floor slab 51, the receiving chain block which is carried by the truck 6 with the upper end 111 facing forward, and is installed at the rear end of the main frame 31. It is lowered onto the upper deck 51 by 36.

Next, the chain block 334 disposed at the rear end of the cross beam member 332 in the corrugated steel sheet web member conveying device 33 with the corrugated steel sheet web member 11 in the posture as it is.
And the supporting mechanism 336 for the vertical girder member 333 supports the corrugated steel sheet web member conveying device 33 and the suspension member 33.
The main frame 31 is positioned at one branch portion 313 via one curved portion 312 in the width direction via the first and the first frame 331 (see FIG. 5B).

Here, the chain block 334 disposed at the rear end of the cross beam member 332 is removed, and the gripper 338 of the support mechanism 336 is moved to the lower end of the fitting groove 337. The floor is rotated at a right angle to the surface of the floor slab 51 and the vertical direction is directed to the bridge axis direction while the side surface is perpendicular to the bridge axis direction and the vertical direction is matched.

Note that the corrugated steel sheet web member 11 is formed by using a chain block 335 disposed at the upper end of the stringer member 333.
By rotating, work can be performed safely and reliably.

Next, the corrugated steel sheet web member 11 is turned around the gripper 338 fitted in the fitting groove 337 to be conveyed to a predetermined position between a predetermined upper formwork and a lower formwork ( (State shown in FIG. 5C).

[0030] The corrugated steel sheet web member conveying device 33 having conveyed the corrugated steel sheet web member 11 returns to the original position along the main frame 31, and again returns to the next corrugated steel sheet web member 1.
Prepare for 1 transfer.

According to the present embodiment, the corrugated steel sheet web member 11 is extended from an existing bridge girder so that the side surface thereof is perpendicular to the surface of the floor slab and the vertical direction is directed to the bridge axis direction. After being conveyed to the position, the upper end is supported and rotated, and the support is turned 90 degrees to be conveyed to a predetermined position between the upper frame and the lower frame.

Accordingly, since the extension frame of the mobile work vehicle 2 that transports the corrugated steel sheet web member 11 to the projecting position of the girder can be lowered, the mobile work vehicle 2 can travel very easily in a stable state. At the same time, the increase in the weight of the mobile work vehicle 2 is small, and there is no fear that the projecting portion of the completed bridge is bent or buckled.

In particular, by using the corrugated steel sheet web member conveying device 33, the corrugated steel sheet web member can be easily and surely rotated and swung at the overhanging portion, so that the work is speeded up and safety is secured. Can be.

[0034]

As described above, according to the present invention, the corrugated steel sheet web member is formed so that the side surfaces thereof are perpendicular to the surface of the floor slab, and the upper end edge and the lower end edge thereof are perpendicular to the surface of the floor slab. In this state, the conveyor beam is transported to the overhang position of the ready-made bridge girder, so that the extension frame of the mobile work vehicle that transports the corrugated steel sheet web member to the overhang position of the girder can be lowered.

Accordingly, the mobile work vehicle can be extremely easily run in a stable state, and even if the extension frame is provided, the weight of the mobile work vehicle is small, and the overhanging portion of the completed bridge is bent. In addition, there is no fear of buckling or buckling, and the corrugated steel sheet web member is not transported in a suspended state at a high position of the mobile work vehicle, so that the work efficiency is extremely good.

[Brief description of the drawings]

FIG. 1 is a side view showing a mobile work vehicle used in an embodiment of the present invention.

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a plan view of a main frame used in the mobile work vehicle shown in FIG. 1;

FIG. 4 is an enlarged side view showing a support mechanism of the corrugated steel sheet web member.

FIG. 5 is an explanatory diagram showing a use state of the mobile work vehicle shown in FIG. 1;

FIG. 6 is an explanatory view showing a corrugated steel sheet web PC bridge.

FIG. 7 is an explanatory view showing a conventional example.

[Explanation of symbols]

1 corrugated steel sheet web, 5 floor slabs, 11 corrugated steel sheet web members.

Claims (1)

[Claims] 1. A corrugated steel sheet web member suspended on a pier, with its side surfaces being at right angles to the surface of the slab and the upper and lower edges being at right angles to the surface of the slab. After transferring to the overhang position of the ready-made bridge girder and making the side surface perpendicular to the bridge axis direction, support the upper end, rotate it by 90 degrees and turn it to place it at a predetermined position between the upper frame and the lower frame. A method for transporting corrugated steel sheet web members in bridge construction.