JPS60144403A - Method and apparatus for constructing prestressed concrete bridge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method and apparatus for constructing a prestressed concrete bridge over a pre-constructed bridge pier by overhanging each block sequentially in the longitudinal direction of the pier.

In the prestressed concrete bridge construction method (P&Z method), early frame equipment is suspended via suspension frames from the feed girders that are erected over the existing bridge superstructure and the piers on which the bridge superstructure is to be constructed. This is a construction method in which the bridge superstructure is overhanged one block at a time. In this construction method, 1
When the overhanging construction of the bridge superstructure of the block is completed, the formwork equipment is moved to the position where the bridge superstructure will be overhanged next, and the assembly work of reinforcing bars, sheathing, etc. is carried out at that position, and the concrete pouring etc. work is being done.

However, performing multi-step work such as reinforcing bars, sheathing, etc. at the construction site of the pier superstructure is not only dangerous because it involves work at height, but also difficult to transport materials. There are also problems with the safety of this work.

In view of the actual conditions of conventional construction methods as described above, the present invention provides a prestressed concrete bridge construction method that can significantly reduce work at heights and improve work safety and efficiency, and an apparatus for implementing the method. This is what I am trying to do.

Next, the structure of the construction method and apparatus according to the present invention will be described with reference to an embodiment shown in the drawings.

In Figures 1 and 2, 1 is a bridge pier, and this pier 1 is constructed in advance before the construction of the bridge, and on the pier 1 there are blocks arranged one block at a time toward the front and rear of the bridge. Prestressed concrete bridge superstructure 2 is successively overhanged. 3 is the feed digit,
This feed girder 3 is constructed using a frame 5 and an intermediate support 6 on the constructed portions of the bridge superstructure 4, the piers 1, and the bridge superstructure 2, which have already been constructed. T is a hanging frame, and this hanging frame T is movably and fixedly supported on the feed girder 3, and a formwork device 8 is suspended from the hanging frame 7 via a lifting device 9. . This lifting device 9 includes a hoisting winch 1
0, the formwork device 8 is composed of a hanging tool 11 fixed to the formwork device 8, a lower sheave 12 pivotally connected thereto, a hoisting wire 13 hanging from the hoisting winch 10 to the lower sheave 12, etc. It can be moved up and down between the ground and the construction position of the bridge superstructure 2. The formwork device 8 is installed 2 in front of the pier 1.
Two sets of formworks 8 are provided at the rear, and these formworks 8 are suspended by a hanging frame 7 and a lifting device 9 so as to be able to be raised and lowered individually. 3 and 4 show the detailed configuration of the main parts, the hanging frame T is equipped with a hanging frame traveling cart 14 for moving on the feed girder 3, and the hanging frame 7 and the mold The hanging tool 11 of the frame device 8 is equipped with a center hole jack 15. This center hole jack 15 is for fixing the formwork device 8 with a PC steel rod 16 at the construction position of the bridge-superstructure 2. Note that the formwork device 8 is
As shown in FIG. 5, it can be divided into two parts, front and rear, so that the pier 1 can easily pass through.

A construction method for constructing a prestressed concrete bridge using a device configured as a diagonal will be explained with reference to FIG.

Pier 1 is constructed before the construction of the bridge superstructure. First, one block of bridge superstructure ■ is constructed on top of pier 1, and then the feed girder 3 is installed from bridge superstructure 4, which has been completed, to the top of pier 1. Conveying and feeding...The girder 3 is supported by the frame 5 on the end of the existing bridge superstructure 4 and the bridge superstructure O, and the girder 3 is supported in the work yard on the ground [formwork device 8
a * 8 Cause for assembling iron, reinforcement, sheath, etc. to a'. Next, the formwork devices 8a and 83' are lifted to the construction position of the bridge superstructure, set at the first block position, and concrete pouring, curing, and tensioning work for the first block is performed.
In parallel with this work, reinforcing bars, sheaths, etc. are assembled on other formwork devices eb and ab' that have been lowered to the work yard on the ground (B), (Q).

After curing the first blocks ■ and ■, the formwork devices 8a and 8a
'Y-demolded and lowered to the ground, lifted formwork device 8be8b't' with reinforcing bars, sheaths, etc. already assembled on the ground and set it at the second block position, concrete pouring and curing of the second block. (DJ, (El.
After curing the second block, its formwork 8b, 8b'
is lowered to the ground, and the third block is similarly constructed using the formwork apparatus 8a+8a'.

After completing the construction of the bridge superstructure 2 on the pier 1 by repeating the above steps in sequence, the front formwork device 9a is installed.

8b is temporarily placed in that position, and the rear formwork device 8a'1 is
8b' is temporarily placed near pier 1. Meanwhile, construction of pier 1', on which the next bridge superstructure will be constructed, and 1 block of bridge superstructure O have been completed.
transport the existing bridge superstructure 2 and the bridge superstructure O of the pier 1' to support it using the frame 5 Q, and formwork device 8 in front.
a * ab' to the rear of the pier 1', the rear formwork device 8
Move a' r 8 b' to the front of the pier 1'.

Note that the formwork devices 8a' and 8b' that allow the pier 1' to pass through are 0° formwork devices that are moved by moving them on the ground, disassembling and reassembling them, or moving them in a lifted state. 8a.

After moving 8b, 8a' and 8b', feed digit 3
is further transported to a predetermined position and supported by the pedestal 5 and intermediate support 6, and construction of the bridge superstructure is continued in the same manner as above (
Il.

By the way, in the construction work process of the bridge superstructure 2 as described above, the work of assembling reinforcing bars, sheathing, etc. to the formwork device 8 is performed in the work yard on the ground, so the work at heights can be significantly reduced. . Therefore, work safety is improved, and work such as transporting materials can be carried out more efficiently (and safely).

In summary, the present invention is a construction method in which a prestressed concrete bridge is constructed by sequentially overhanging one block at a time in the longitudinal direction of the piers on pre-constructed piers, and a feed girder is installed on the existing bridge superstructure, The formwork device suspended on this feed girder is lowered to the ground and reinforcing bars, sheathing, etc. are assembled on this formwork device, and then the formwork device is hoisted to a predetermined position and connected to the existing superstructure, and concrete This is a construction method in which the process of constructing the bridge superstructure one block at a time by performing pouring etc. is repeated sequentially, and the prestressed concrete/crete bridge is built one block at a time in the front and back direction of the piers that have been constructed in advance. It is a device for overhang construction, which includes a feed girder installed on the pier superstructure, a hanging frame movably installed on the feed girder, a formwork device for constructing the pier superstructure for each block, and This equipment is equipped with a lifting device that suspends the formwork from the above-mentioned suspension frame and raises and lowers it between the ground and the construction position of the bridge superstructure, which greatly reduces work at heights when constructing prestressed concrete bridges. This makes it possible to improve work safety and efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the presto concrete bridge construction apparatus according to the present invention, in which Fig. 1 is an overall side view showing the outline of the apparatus, Fig. 2 is a front view of the same, and Fig. 3 is an essential part. Fig. 4 is a longitudinal sectional front view of the same concrete 1) -) Fig. 5 is a longitudinal sectional front view of the main part showing the other side of the formwork device, Fig. is an explanatory diagram showing the order of work steps. 1... Bridge pier, 2... Bridge superstructure, 3... Feed girder,
4... Bridge superstructure that has already been constructed, 5... Frame, 6... Intermediate support, 7... Hanging frame, 8... Formwork device, 9... Lifting device, 10.・Hoisting winch, 11・
... Hanging tool, 12... Lower sheave, 13... Hoisting wire, 14... Hanging frame traveling trolley, 15... Center hole jack, 16... PC steel bar patent applicant Shimizu Corporation Co., Ltd. Figure 2 Figure 4 Section ψ 17-

Claims (4)

[Claims] (1) A construction method in which prestressed concrete bridges are constructed by overhanging prestressed concrete bridges sequentially one block at a time in the front and rear directions of the piers on pre-constructed piers. A feed girder is installed on the existing bridge superstructure, and the bridge is suspended from the After lowering the formwork device held onto the ground and assembling reinforcing bars, sheathing, etc. on this formwork device, the formwork device is hoisted to a predetermined position, connected to the existing superstructure, and concrete is poured. A prestressed concrete bridge construction method characterized by sequentially repeating the process of constructing the bridge superstructure for each block. (2) There will be two sets of formwork devices, one at the front and one at the front, across the pier, and the assembly of reinforcing bars, sheathing, etc. on the ground and the concrete pouring at the top will be carried out in parallel using alternating formwork devices. A prestressed concrete bridge construction method according to claim 1, characterized in that: (3) A device that constructs a prestressed concrete bridge over a pre-constructed pier by sequentially extending it one block at a time in the front and back direction of the pier. A suspension frame that is freely erected, a formwork device that constructs the pier superstructure for each block, and this formwork device that is suspended from the suspension frame and raised and lowered between the ground and the construction position of the bridge superstructure. A prestressed concrete bridge construction device characterized by being equipped with a lifting device. (4) Two sets of formwork devices should be provided at the front and rear sides of the bridge pier, and the lifting device should be able to raise and lower these formwork devices between the ground and the construction position of the bridge superstructure. A prestressed concrete bridge construction device according to claim 3, characterized in that: