JPH08177011A - Method and equipment for erecting pc concrete block - Google Patents

Abstract

PURPOSE: To construct a bridge girder safely by a compact facility efficiently by using PC concrete blocks. CONSTITUTION: A plurality of hoists 2 are installed to an erection service car 1 movably mounted on previously constructed the concrete blocks, and a new PC concrete block (a) is hung up by the hoists 2 through a parallel shifter 3 fixed onto the block (a). The block (a) is pulled in and moved while taking reaction in the section of the parallel shifter 3 under the state, in which the rear end of the new PC concrete block (a) is faced at the front end of the previously constructed concrete blocks A, and both blocks A, (a) are clamped by PC steel rods under the state, in which the end faces of both blocks A, (a) are abutted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method and apparatus for constructing a PC concrete block to be a bridge girder while projecting it from a pier.

[0002]

2. Description of the Related Art A conventional method for constructing a cable-stayed bridge, etc., by successively projecting bridge girders from the heads of pre-built bridge piers, is to use a crane club, a ship crane, a crawler crane, etc. The bridge girder is extended by facing the tip of the constructed block, fastening them with the end faces of both blocks in contact with each other, and repeating this work in sequence.

[0003]

By the way, according to the conventional method as described above, the scale of the mechanical equipment for hoisting the PC concrete block becomes large, the equipment cost becomes high, and at the time of hoisting the PC concrete block. There is a problem that it is difficult to align the blocks with each other in the above-mentioned step, and the swinging of the load occurs at the time of hoisting, which makes it difficult to ensure safety.

Therefore, an object of the present invention is to make the construction equipment compact and accurately align the blocks with each other.
It is an object of the present invention to provide a PC concrete erection method and device capable of solving the problem of load swing and improving safety.

[0005]

In order to solve the above-mentioned problems, the invention of a method is a plurality of hoisting devices provided on a pre-constructed PC concrete block, and a new PC concrete block is fixed on the block. At the hoisting position where the angle is adjustable via the parallel movement device and the new PC concrete block is made to face the tip of the constructed PC concrete block with a predetermined interval, through the movable part of the parallel movement device, A new PC concrete block is pulled in while taking a reaction force to the fixed part, and it has been constructed P
In this structure, the C concrete block and the new PC concrete block are brought into contact with each other, and both blocks are fastened with a PC steel rod.

[0006] Similarly, the invention of the apparatus is a erection work vehicle installed movably on a pre-constructed PC concrete block, and a plurality of hoisting devices attached to a portion of the erection work vehicle protruding from the tip of the block. , A parallel moving device fixed to the upper surface of a new PC concrete block and hoisted by the hoisting device, the translating device being a new PC for a hanging beam hoisted by the hoisting device.
The structure adopts a structure in which a block mounting beam for fixing a concrete block is mounted in a suspended manner so as to be movable in the length direction of the suspension beam.

[0007]

[Operation] An erection work vehicle is installed on the constructed PC concrete block, and the parallel moving device is fixed on the new PC concrete block.

With a plurality of hoisting devices provided on the erection work vehicle, a new PC concrete block is hoisted through a parallel moving device, and this block is made to face the end of the constructed PC concrete block with a predetermined interval, In this state, the suspension beam of the parallel moving device is fixed to the fixed part by the reaction force device to take reaction force, and the block mounting beam and the new PC concrete block are retracted by the retracting device, so that the end faces of both blocks come into contact with each other. Then, if both blocks are fastened with a PC steel rod, the PC concrete block can be extended.

When a novel PC concrete block is hoisted, the hoisting device can be individually lifted by a plurality of hoisting devices to give the block the necessary inclination. Further, since the suspension beam is fixed by the reaction force supporting device when the new PC concrete block is pulled in, the alignment accuracy is improved and the occurrence of load shake can be prevented, and the work safety is improved.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the erection device of the present invention comprises an erection work vehicle (worken) 1 to be installed on a constructed PC concrete block A, and a plurality of hoisting devices 2 attached to the work vehicle 1. It is fixed on a novel PC concrete block a and is constituted by a parallel moving device 3 which is hoisted by the hoisting device 2.

FIG. 3 shows the structure of the PC concrete blocks A and a to be a bridge girder, which has a cross-sectional shape corresponding to the bridge girder in the width direction and a predetermined length in the length direction.
A large number of PC steel rod insertion holes 4 are provided so as to penetrate in the length direction. The blocks A and a are manufactured by utilizing the front end surface of the block to be erected in advance as a mold for the rear end surface so that the end surfaces of both the constructed and new blocks A and a are completely in close contact with each other. .

Further, as shown in FIG. 4, the fastening of the two blocks A and a is carried out by inserting the PC steel rod 31 inserted into the insertion hole 4 of the new PC concrete block a into the PC steel rod of the constructed PC concrete block A. This is performed by connecting the screw 32 and the screw joint 33.

The erection work vehicle 1, as shown in FIG.
A diamond-shaped frame 6 is mounted on a pair of rails 5 fixed onto a pre-constructed PC concrete block A via wheels, enabling movement along the rails 5 by electric or manual operation and fixing to the rails 5 by an anchor jack. Has become. When the erection work vehicle 1 is positioned on the most advanced PC concrete block A, the front half of the frame 6 projects forward from the tip end surface of the block A.

Below the mounting beam 7 provided on the front half of the frame 6, a total of four or five hoisting devices 2 using electric or manual check blocks are provided.

The hoisting device 2 can be operated individually, and the parallel moving device 3 fixed to a new PC concrete block a is hoisted at four points or five points with a linear material such as a chain 8 or a wire. By adjusting the length of each chain 8, the posture of the block a can be controlled by the inclination direction and rolling.

Next, as shown in FIGS. 1 to 5, the parallel moving device 3 includes a pair of independent suspension frames 9 and 9 on both sides, respectively.
It is composed of a block mounting beam 10 mounted in a suspended manner in a lower portion between both suspension frames 9 and 9. The suspension frames 9 and 9 are independently lifted at positions near both ends of the upper surface by chains 8 of the lifting device 2. It is formed of an upper suspension beam 11 and lower suspension beams 13, 13 attached to the lower portion of the suspension beam 11 in parallel with a plurality of links 12.

The block mounting beam 10 is formed in a horizontally long frame shape, and is arranged below both side lower suspension beams 13 and 13 so that the longitudinal direction thereof is a right angle, and corresponds to the front and rear of both lower suspension beams 13 and 13. A suspension device 14 provided in the portion is attached in a suspended manner so as to be movable back and forth along the length direction of the lower suspension beams 13, 13.

The block mounting beam 10 is fixed to the new PC concrete block a by stacking it on the upper surface of the block and removably connecting the plurality of positions with bolts.

The suspension device 14 for mounting the block mounting beam 10 on the lower suspension beam 13 is, as shown in FIGS. 4 and 5, a downwardly U-shaped suspension frame 1 that straddles the lower suspension beam 13.
5 is fixed on the block mounting beam 10, and the endless track type rotary roller 16 is provided between the upper surface of the suspension frame 15 and the upper surface of the lower suspension beam 13 facing each other, and the block mounting along the longitudinal direction of the lower suspension beam 13 is performed. The beam 10 is moved smoothly.

The suspension device 14 replaces the endless track type rotation roller 16 with a slippery material such as Teflon incorporated between the suspension frame 15 and the lower suspension beam 13 to slide the block mounting beam 10. Alternatively, a plurality of suspension rollers may be used so that the suspension can be suspended.

At the lower part of the erection work vehicle 1 described above, a reaction force receiving device 17 with which the rear end of the lower suspension beam 13 of the parallel moving device 3 hoisted to the elevated position abuts, and a rear end of the block mounting beam 10 are connected. However, a retracting device 18 for retracting the new PC concrete block a is provided. This reaction force receiving device 17
As shown in FIG. 4, the retracting device 18 is provided above and below a bracket 19 projecting downward from the erection work vehicle 1,
The upper reaction force receiving device 17 is configured to bring the tip of the square screw shaft 21 screwed into the nut member 20 of the bracket 19 into contact with the rear end of the lower suspension beam 13 by the turning operation of the handle 22. There is.

Further, the lower retractor 18 supports a square screw shaft 24 by a bearing 23 fixed to a bracket 19 so that the square screw shaft 24 can rotate and move in the axial direction, and the tip of the square screw shaft 24 is attached to the block mounting beam 10. The block mounting beam 10 and the new PC concrete block a fixed thereto are screwed into the built-up PC concrete block A side by screwing together with a nut member 25 provided at the end of the block mounting beam 10 by rotation of the square screw shaft 24 by the handle 26. It is supposed to be.

FIG. 6 shows another means for hoisting and moving a new PC concrete block. A rail 27 is provided above the erection work vehicle 1 so that the rail 27 can be moved back and forth. A plurality of hoisting devices 2 are attached to the installed movable carriage 28, and the hoisting device 2 hoists the new PC concrete block a through the block mounting beam 10 fixed on the new PC concrete block a. Has become.

If an endless track type rotary roller is adopted in the moving portion along the rail 27 of the moving carriage 28, the moving can be performed smoothly, and a new PC concrete block a which is lifted up is used.
The work of pulling in is easy.

Next, an example in which a PC concrete block is erected to construct a tilted bridge will be concretely described based on the illustrated embodiment.

As shown in FIG. 7, after the abutment 29 is constructed, the main tower work 30 and the bridge girder are constructed. When constructing the bridge girder,
Manufacture a PC concrete block into which the bridge girder is subdivided,
The block is transported to the bridge site and hoisted by the hoisting device 2 of the erection work vehicle 1 set on the abutment 28 and the parallel moving device 3 fixed on the PC concrete block. It is fixed using a steel rod, and then the erection work vehicle 1 is moved forward onto the constructed PC concrete block A, and a new PC concrete block a is lifted and fastened, and the bridge girder is extended by repeating this. .

The hoisting of the novel PC concrete block a is carried out by hoisting four points or five points by the hoisting device 2 provided on the erection work vehicle 1 and operating each hoisting device 2 individually. The desired inclination can be given to the block a, and the scent can be installed.

Between the rear end surface of the newly hung up PC concrete block a and the front end surface of the constructed PC concrete block A, an adhesive or the like may be applied to the opposing surface or the PC
The steel rods are lifted so that a gap of, for example, about 30 cm is formed so that the joining work can be performed.

With the new PC concrete block a facing the tip of the constructed PC concrete block A, the adhesive is applied to the opposing end faces of both blocks A and a,
The work of connecting the PC steel rod 31 previously inserted in the block a to the PC steel rod 32 of the block A was performed, and was further provided on the erection work vehicle 1 side with respect to the lower suspension beam 13 of the parallel translation device 3. The square screw shaft 21 of the reaction force receiving device 17 is brought into contact with the block mounting beam 10, and the square screw shaft 2 of the retracting device 18 is attached to the block mounting beam 10.
Combine 4

In this state, when the square screw shaft 21 of the retracting device 18 is rotated and the block mounting beam 10 is retracted, the block mounting beam 10 and the new PC concrete block a fixed to this are mounted along the lower suspension beam 13. Moves in parallel, and the rear end surface of the new PC concrete block a comes into contact with and closely adheres to the front end surface of the constructed PC concrete block A. At this time, the lower suspension beam 13 and the block mounting beam 10 are fixed by inserting a safety pin across the suspension device 14 and the lower suspension beam 13.

At the time of retracting the new PC concrete block a, the side of the lower suspension beam 13 of the parallel moving device 3 is
Since the block mounting beam 10 is fixed to the erection work vehicle 1 in the pulling direction by the reaction force receiving device 17 and the block mounting beam 10 moves along the length direction of the lower suspension beam 13 via the suspension device 14, a new PC concrete is provided. At the same time as the lifting posture of the block a is stabilized, there is no swinging of the load, the positional accuracy is improved, and the end faces of both blocks A and a can be brought into contact accurately.

After the blocks A and a are brought into contact with each other, the PC steel rod 3
By screwing the nut onto the tip side of 1, both blocks A,
After a is fastened, the retracting device 18 and the block mounting beam 10 are uncoupled, the reaction force receiving device 17 is retracted, and the block mounting beam 10 and the block a are unfixed. Construction work vehicle 1 on PC concrete block
Is moved forward, and the parallel moving device 3 is lowered so as to prepare for the lifting of the next new block.

[0034]

As described above, according to the present invention, a new PC concrete block is hung up by a plurality of hoisting devices so that the angle can be adjusted, and the new PC concrete block is pulled in while taking a reaction force to construct the pre-built PC concrete. Since it is connected to the block, the posture of the hoisted PC concrete block can be freely controlled, there is no shake of the load when hoisting, the accuracy of the hoisting position is improved, and the construction of cable-stayed bridges is safe. Can be done efficiently.

Further, since a plurality of hoisting devices of the erection work vehicle installed on the constructed PC concrete block hoist the new PC concrete block through the parallel moving device, the construction of the construction equipment becomes extremely simple. Can be made compact.

[Brief description of drawings]

FIG. 1 is a side view showing a suspended state of a PC concrete block of an erection device.

FIG. 2 is an enlarged front view of the main part of the same.

FIG. 3 is a front view of a PC concrete block and a parallel moving device.

FIG. 4 is a partially cutaway side view showing an enlarged connecting portion of a PC concrete block.

FIG. 5 is an enlarged front view showing a suspension device.

FIG. 6A is a side view showing another example of an erection device for hoisting a PC concrete block, and FIG. 6B is a front view of the same.

FIG. 7 is a front view showing an example of a completed cable-stayed bridge.

[Explanation of symbols]

 1 Construction work vehicle 2 Lifting device 3 Parallel moving device 17 Reaction force receiving device 18 Retracting device

Front Page Continuation (72) Inventor Toshiaki Hattori 3-7-4 Sonemachi, Izumiotsu City (72) Inventor Go Nanyama 1-2-2-14-702 Tenjo Saijo, Kure City

Claims (5)

[Claims] 1. A plurality of hoisting devices provided on a prefabricated PC concrete block, hoisting the new PC concrete block through a parallel moving device fixed on the block so that the angle can be adjusted, and the new PC concrete block is lifted. At the hoisting position where the end of the constructed PC concrete block is faced with a predetermined gap, a new PC is created by applying a reaction force to the fixed part via the movable part of the parallel movement device.
A method for constructing a PC concrete block, characterized in that the concrete block is pulled in, and both blocks are fastened with a PC steel rod in a state where the end faces of the constructed PC concrete block and the new PC concrete block are in contact with each other. 2. A method of lifting, wherein the hoisting device independently and independently changes the lengths of linear members for hoisting a plurality of points through a parallel moving device fixed to a new PC concrete block. The method for constructing a PC concrete block according to claim 1, wherein an angle adjustment and rolling of the hoisted block can be performed by using the. 3. The parallel movement device is formed by attaching a block mounting beam to a suspension beam suspended by a suspension device by a suspension system so as to be movable in the length direction of the suspension beam, and forming a novel PC concrete block. 2. The PC concrete block erection method according to claim 1, wherein the block mounting beam is retracted by the retracting device while the suspension beam is supported by the fixed portion by the reaction force device to support the reaction force when retracting. 4. A erection work vehicle installed movably on a prefabricated PC concrete block, a plurality of hoisting devices attached to a portion of the erection work vehicle protruding from the tip of the block, and a new PC. The parallel movement device is fixed to the upper surface of the concrete block and is lifted by the hoisting device. The parallel movement device includes a block mounting beam for fixing a new PC concrete block to a suspension beam hoisted by the hoisting device. PC with a structure that is attached in a suspended manner so that it can move in the length direction of the suspension beam
Concrete block erection equipment. 5. When moving the block mounting beam with respect to the suspension beam,
The PC concrete block erection device according to claim 1, wherein an endless track type rotary roller is adopted.