JPH031441B2 - - Google Patents

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 pier by sequentially overhanging each block one block at a time in the longitudinal direction of the pier.

Prestressed concrete bridge construction method (P
&Z construction method) is a feed girder constructed over the existing bridge superstructure and the pier on which the bridge superstructure will be constructed next.
This is a construction method in which the formwork equipment is suspended via a hanging frame, and the bridge superstructure is successively extended one block at a time before and after the piers. In this construction method, once the overhang construction of one block of bridge superstructure is completed, the formwork equipment is moved to the position where the next bridge superstructure will be overhanged, and the reinforcing bars, sheathing, etc. are assembled at that position. Work such as concrete pouring is underway.
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, an embodiment of the construction method and the construction of the apparatus according to the present invention will be described with reference to the drawings.

In Figures 1 and 2, 1 is a bridge pier, which is constructed in advance prior to the construction of the bridge. Prestressed concrete bridge superstructure 2 will be constructed in sequence. 3 is the feed digit, and this feed digit 3
is constructed using a frame 5 and an intermediate support 6 on a bridge superstructure 4, a bridge pier 1, and a bridge superstructure 2 that have already been constructed. Reference numeral 7 denotes a hanging frame, and this hanging frame 7 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 10, a hanging tool 11 fixed to the formwork device 8, a lower sheave 12 pivotally supported thereon, a hoisting wire 13 hung from the hoisting winch 10 to the lower sheave 12, etc. The formwork device 8 can be moved up and down between the ground and the construction position of the bridge superstructure 2. Two sets of formwork devices 8 are provided at the front and two sets at the rear of the pier 1, and these formworks 8 are each suspended by a hanging frame 7 and a lifting device 9 so as to be able to rise and fall independently. 3 and 4 show the detailed configuration of the main parts, and the hanging frame 7 has a hanging frame traveling cart 14 for moving on the feed girder 3.
Furthermore, the hanging frame 7 and the hanging tool 11 of the formwork device 8 are equipped with a center hole jack 15. This center hole jack 15 is
This is for fixing the formwork device 8 with the PC steel rods 16 at the construction position of the bridge superstructure 2. Note that the formwork device 8 consists of two
Each set can be divided into two at an intermediate position in the left-right direction, so that the structure can be made such that the bridge pier 1 can easily pass through.

A construction method for constructing a prestressed concrete bridge using the apparatus constructed as described above will be explained with reference to FIG.

Pier 1 is constructed prior to construction of the bridge superstructure. First, one block of bridge superstructure is constructed on top of pier 1, and then feed girder 3 is moved from bridge superstructure 4, which has been completed, to the top of pier 1. and send it to
The feed girder 3 is supported by the frame 5 on the end of the existing bridge superstructure 4 and on the bridge superstructure, and reinforcing bars are installed in the front and rear formwork devices 8a, 8a' close to the bridge pier 1 in the work yard on the ground. Assemble the sheath etc. (A). Next, the formwork proximate parts 8a and 8a' are lifted to the construction position of the bridge superstructure, set at the first block position, and concrete pouring, curing, and tensioning work is performed for the first block. Rebars, sheaths, etc. are assembled on other formwork devices 8b and 8b' that have been lowered to the work yard (B) and (C).

After curing the first block, its formwork device 8
The molds a and 8a' are demolded and lowered to the ground, and the formwork devices 8b and 8b', on which reinforcing bars, sheaths, etc. have already been assembled, are lifted up and set at the second block position, and the concrete of the second block is poured. In addition to performing pouring, curing, and tensioning work, assembling work of reinforcing bars, sheathing, etc. is proceeded on the ground in the formwork devices 8a, 8a'. At this time, the feed girder 3 is mainly used for the pier 1
It is supported by the upper intermediate strut 6 and the pedestal 5. (D), (E). After curing the second block,
The formworks 8b, 8b' are lowered to the ground, and the third block is similarly constructed using the formwork devices 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 8a,
8b is temporarily placed in that position, and the formwork device 8 at the rear is
Temporarily place a' and 8b' near pier 1. In addition,
Meanwhile, construction of the next bridge superstructure, pier 1', and the first block of bridge superstructure above it have been completed (F). Next, the feed girder 3 is sent and supported using the frame 5 on the existing bridge superstructure 2 and the bridge superstructure of the pier 1' (G), and the front formwork device 8a,
8b' to the rear of the pier 1' and the rear formwork devices 8a', 8
Move b' to the front of pier 1'. The formwork devices 8a' and 8b' that allow the pier 1' to pass are moved by moving them on the ground, disassembling them and reassembling them, or moving them in a lifted state (H). After the formwork devices 8a, 8b and 8a', 8b' are moved, the feed girder 3 is further sent to a predetermined position and supported by the frame 5, and the process returns to (A) to continue construction of the bridge superstructure in the same manner as above. (I).

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

In short, 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 piers that have been constructed in advance. The formwork device suspended on this feed girder is lowered to the ground, 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. This is a construction method in which the process of constructing the bridge superstructure for each block by pouring concrete is repeated sequentially, and the prestressed concrete bridge is constructed by overhanging the prestressed concrete bridge one block at a time in the front and rear directions of the piers on the piers that have been constructed in advance. It is a device that 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 mold. Since this equipment is equipped with a lifting device that suspends the frame device on the above-mentioned hanging frame and raises and lowers it between the ground and the construction position of the pier superstructure, it greatly reduces the work at heights when constructing prestressed concrete bridges. This can improve work safety and efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the prestressed concrete bridge construction device according to the present invention, in which FIG. 1 is an overall side view showing the outline of the device, FIG. 2 is a front view of the same, and FIG. 3 is a longitudinal cross-section of the main part. Front view, Figure 4 is a longitudinal sectional front view during concrete pouring, Figure 5 is a longitudinal sectional front view of the main part showing another example of the formwork device, and Fig. 6
(A) to (I) are explanatory diagrams 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.

Claims (1)

[Claims] 1. A construction method in which a prestressed concrete bridge is constructed by sequentially overhanging one block at a time in the front and back direction of the piers on the piers that have been constructed in advance,
A feed girder is installed on the existing bridge superstructure, the formwork device suspended from the feed girder is lowered to the ground, reinforcing bars, sheathing, etc. are assembled on this formwork device, and then the formwork device is moved to the specified position. A breast-stressed concrete bridge construction method characterized by sequentially repeating the process of lifting the block into position, connecting it to the existing superstructure, pouring concrete, etc., and constructing the bridge superstructure for each block. 2 The formwork equipment is installed at the front and rear sides of the pier.
Prestressed concrete according to claim 1, characterized in that the assembling work of reinforcing bars, sheathing, etc. on the ground and the work of concrete pouring on the upper part are performed in parallel using alternating formwork devices. Bridge construction method. 3. A device for constructing a prestressed concrete bridge on a pre-constructed pier by sequentially overhanging it one block at a time in the front and back direction of the pier,
A feed girder installed on the pier superstructure, a suspension frame movably constructed on the feed girder, a formwork device for constructing the pier superstructure for each block, and this formwork device attached to the above suspension frame. Prestressed concrete bridge construction equipment characterized by being equipped with a lifting device that suspends and lifts the bridge superstructure between the ground and the construction position of the bridge superstructure. 4 There are two formwork devices on each side of the bridge pier.
4. The prestressed concrete bridge construction apparatus according to claim 3, wherein the assembling and lifting apparatus raises and lowers the formwork apparatus between the ground and the construction position of the bridge superstructure.