JPH01210510A - Method of installation construction of structure such as bridge - Google Patents

Abstract

PURPOSE:To shorten the term of works, and to reduce construction cost by constituting the width of a leg member for a structure in width sufficient for fixing a traveling type crane under a stable state. CONSTITUTION:Abutments 3, 3 are constructed on both banks 2, 2 of a ravine 1, while piers 4 in width in an extent that an outrigger mounted to a truck crane 5 can land sufficiently are installed on both banks 2a, 2a of a river in the deepest section of the ravine 1. Bridge girders 6 are erected among the side spans of the abutments 3 and the piers 4 by the truck crane 5, the truck crane 5 is moved up to the positions of the previously mounted piers by utilizing the previously mounted bridge girders 6, and a bridge girder 6 is built between the piers 4, 4. Accordingly, the preparation, conveyance, installation and preparatory works of erection materials such as an erection work tower, a cable crane, an anchor block, a temporary cable, etc. are unnecessitated.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a method for constructing a structure such as a bridge by sequentially moving structural leg members and structural girder members constituting a structure such as a bridge. Pertains to construction methods for structures such as bridges.

(Prior art) Structural leg members (hereinafter referred to as bridge piers or abutments) and structural girder members (hereinafter referred to as bridge piers or abutments) that constitute structures such as bridges in valleys with wide valleys and a river flowing through the deepest part. (Hereinafter, this is referred to as a bridge girder.) When constructing bridge piers on both sides of the river at the deepest point, bridge girders are constructed in the side spans between the abutments and piers installed on both sides of the ravine. After that, a bridge girder is constructed between the piers.

The method for constructing the bridge is as follows: ■ - Pull crane construction: Build temporary work towers on the bridge abutments on both banks of the valley, and construct bridge piers on both banks of the river at the ringmost part of the valley. A cable crane is stretched between the temporary work towers, the bridge girder is suspended and moved by a pulley attached to the cable crane so as to be freely movable, the bridge girder is erected between the side spans of the bridge piers and abutments, and then , a construction method in which a bridge girder is erected between two piers.

■ Kin Lever 77I Split bridge girders are installed as cantilevers using temporary cables strung on work towers, and then connected to form a long bridge girder that is constructed in the side span between the abutment and the pier, or between the side spans of each pier. The construction method was designed to

■ -... Bridge abutments will be constructed on both banks of the lane gorge, and bridge piers will be erected on both banks of the river at the deepest part of the gorge, and a truck crane will be used to suspend the bridge between the abutments and the side spans of the piers. The suspended bridge girder is erected, the truck crane is moved onto the existing bridge girder, the bridge girder suspended by the truck crane is then erected between the bridges, and then the truck crane is moved onto the existing bridge girder in the same manner as above. The construction method involved moving the bridge and then constructing a new bridge girder between the abutment and the pier on the opposite bank.

etc. are being implemented.

However, with any of the above-mentioned construction methods, the construction period becomes long, and a large amount of equipment and materials are required for construction, which increases construction costs, and the situation is not satisfactory in terms of safety. It wasn't. In other words, with regard to ■-Pull Relay 1, it is necessary to stretch a cable crane between temporary work towers installed on bridge abutments on both sides of the gorge, and to anchor it to an anchor block. A large number of construction materials and equipment are required to carry out the construction work, such as pulleys that are movably attached to a crane and that suspend and move the bridge girder, and as mentioned above, cables between temporary work towers are required. Preparatory work for the erection work, such as hoisting a crane, is required, which leads to the problem of prolonging the construction period and raising the total construction cost.

■If we look at the Kin Lever IAU, temporary work towers must be built on abutments installed on both sides of the valley and piers installed on both banks of the river, and temporary cables must be strung on these temporary work towers. Therefore, in order to carry out the erection work, a large number of construction materials are required, as well as preparation work for the erection work.Furthermore, it is necessary to attach the divided bridge girders as cantilevers and connect them. Since the bridge girder is long, the construction period becomes long and the total construction cost increases.

■Torque Crane Volume The suspended bridge girder was erected between the piers, then a truck crane was moved onto the existing pier as described above, and a new bridge girder was then erected between the abutment on the opposite bank and the side span between the pier. Preparatory work and a large amount of construction materials are not required for the erection work as in cases ① and ③ above, but on the other hand, a truck crane performs the erection work on the existing bridge piers.
In particular, it is necessary to consider the grounding space of the outrigger for stabilizing the truck crane.

(Problem to be solved by the invention) As mentioned above, various construction methods have been implemented for constructing structures such as bridges, but all of them have the following problems. .

In other words, in the above ■ cable crane erection method,
A cable crane must be strung between temporary work towers, and it must be moored to an anchor block;
A large number of erection materials and equipment are required to carry out the erection work, such as the need for pulleys to suspend and move the bridge girders, and preparatory work for the erection work is also required, which lengthens the construction period. Coupled with this, there is a problem in that the total construction cost is rising. In addition, in the cantilever construction method, a temporary work tower must be built on the pier and a temporary cable must be strung on the temporary work tower, so a large number of construction materials and equipment are required to carry out the construction work. In addition, preparatory work for erection work is required.
Furthermore, there are problems such as the total construction cost rising due to the lengthening of the construction period, and the most important thing is that both construction methods It is necessary that the location conditions for temporary bases and bridge abutments on both banks and for the bridge piers to touch the ground in the center of the valley are met, and for location conditions where these conditions are not met, in other words, one side is in a mountainous area. Moreover, there is a problem in that it cannot be carried out under location conditions such as mountain roads where there is no place to work or place construction materials.

On the other hand, ■the truck crane erection method, unlike the above ■ and ■, does not require the preparation, transportation, installation, and preparatory work of the erection materials necessary to carry out the erection work, so the construction period can be reduced. It has the advantage of shortening the construction time and reducing construction costs, as well as being able to be carried out even in locations where one side is mountainous and there is no place to work such as a mountain road or place to store construction materials. A truck crane is used to transport the bridge piers and bridge girders, and the construction site is fixed on the piers. It is necessary to provide enough space to stabilize the crane itself. If this width is not sufficient for the outriggers of the truck crane to land on the ground, unexpected accidents such as the truck crane falling during the erection work may occur. Accidents may occur.

In addition, since the existing bridge girder is used as the road for the truck crane to travel, unless the bridge girder is lightweight, the truck crane that suspends it must have a large load rating, and as a result, the bridge girder This creates a vicious cycle in which the heavy weight of the truck crane must be used to suspend it and a truck crane with a higher rated load, making it impossible to carry out the erection work effectively.

(Means for Solving the Problems) The present invention was made in view of the various problems mentioned above, and eliminates the need for preparing, transporting, and installing construction materials, as well as preparatory work, and shortens the construction period. The purpose of this project is to provide a construction method for structures such as bridges that can be carried out safely and reliably under any location conditions while reducing construction costs. After moving the structural leg members to the erection position, they are erected, and then the structural girder members are stretched over the structural leg members, and then the traveling crane with the next structural leg member suspended is stretched. The frame is moved to the position of the leg member for the already erected structure using the structural girder member, and then the leg member for the next structure is erected, and these leg members for the already erected structure are moved. In a structure erection method in which structural leg members are stretched across the side span of The construction method for structures such as bridges was adopted, which is characterized by the structure being constructed and the structural girder members used being structural girders using lightweight trussed structures or high-strength cables.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 6.

To explain the outline using the schematic explanatory diagram shown in Figure 1 showing the entire construction method, bridge abutments (3) are constructed on both banks (2) (2) of the valley (1), and the bridge is constructed at the deepest part of the valley (1). Bridge piers (4) are constructed on each bank of the river (2a) (2a), and bridge girders (6) are suspended by a truck crane (5) between the abutments (3) and the side spans of the piers (4). ), and then using the existing bridge girder (6) to install a truck crane (
5) to the existing pier position, and then move the bridge girder (6) suspended by the truck crane (5) again to the pier (
4) After constructing the bridge between (4) and then using the existing bridge girders (6) and piers (4) as described above, a truck crane (5) will be installed.
The construction method of the present invention, in which the bridge girder (6) is moved to the position of the existing bridge pier, and a new bridge girder (6) is then constructed in the side span between the abutment (3) and the bridge pier (4) on the opposite bank (2). The process is generally carried out as described above, but the details will be explained with reference to the process diagrams of FIGS. 2 to 7.

In the second session, we first learned about concrete abutments (3) (3
) on both banks (2) (2) of the valley (1), and then concrete abutments (4a) (4a) were constructed on both banks (2a) (2a) of the river at the deepest part of the valley (1). Install and fix. And abutment (3) (3) and abutment (4a) (
Once the installation of 4a) is completed, as shown in Figure 3, the truck crane (
5), the pier (4) already constructed in a factory, etc. is suspended and transported to the position of one pier abutment (4a) (on the right bank in the figure), and installed and fixed on the pier abutment (4a).

In addition, the width of the piers (4) (4) is the same as that of the truck crane (
5) The width is wide enough to allow the outriggers provided in 5) to sufficiently land on the ground.

When the installation and fixing of the pier (4) is completed and the bridge girder (6) is to be constructed between the pier (4) and the abutment (3), the pier (4) is installed as shown in Figure 4. The supporting members (7) (7) of the bridge girder (6) are installed on the abutment (3) and the bridge girder (6), which is a highly rigid and lightweight truss structure girder (described later), is then installed using a truck crane (5). The bridge girder (4) is suspended and transported and installed in the side span between the bridge pier (4) and the abutment (3).
6) Stretch it. Then, the flooring material (8) is laid and fixed on the stretched bridge girder (6), and the construction of the bridge girder (6) is completed.

In this way, once the bridge girder (6) has been stretched between the side span of one pier (4) and abutment (3), the pier abutment (4a) on the opposite bank is finished.
), the next pier (4) is installed on top of the truck crane (5) in the same way as in the case shown in Figure 3 above.
), the bridge pier (4) is suspended, and the trunk crane (5) moves by itself on the existing bridge girder (6) and stops when it reaches the end.

Then, the pier (4) is installed and fixed on the pier abutment (4a) (see FIG. 5).

Next, when constructing the bridge girder (6) in the side span of the bridge pier (4) (4), as shown in Figure 6, the supporting member (7) of the bridge girder (6) ) (7), and then the highly rigid and lightweight bridge girder (6) with a truss girder structure, which will be described later, is placed on the existing bridge girder (6) using a truck crane (5) and transported. Pier (4)
A bridge girder (6) will be constructed in the side span of (4). Then, the flooring material (8) is laid and fixed on the constructed bridge girder (6),
Erection of bridge girder (6) is completed.

Pier (4) Once the construction of the bridge girder (6) is completed in the side span of (4), a new bridge girder (6) will be constructed in the side span between the abutment (3) and pier (4) on the opposite bank. However, the pier (4) is suspended by a truck crane (5) in the same way as in the case of Fig. 3 mentioned above, and the truck crane (5)
The bridge runs on the existing bridge girder (6), stops when it reaches the end of the bridge pier (4), and is erected as described above (see Figure 7).
.

The erection work is completed as described above, but a truss structure girder with high rigidity and light weight is suitable for the bridge girder (6) mentioned above, but if the bridge girder (6) is heavy, it cannot be suspended. The truck crane (5) must have a large load rating, which is undesirable as a result. Also,
As mentioned above, this bridge girder (6) is used as a road surface by the trunk crane (5), but since sideways buckling occurs at this time, a structure to prevent this is also adopted, and its detailed structure is shown in Figure 8. This will be explained with reference to the perspective view of FIG.

Figure 8 is a perspective view showing a basic example of a bridge girder (6). The main body (61) of the bridge girder (6) is made of steel with an I-shaped cross section, and a column (62) of an appropriate length is installed on the lower center surface. Install this pillar material (
As shown in the figure, the lower chord members (63) (63) of steel shapes are stretched over the truss structure fingers (62).

In addition, the lower chord material (63) (63) is a high-strength cable member (
Parallel wire cable made by bundling PCl wires with a diameter of 7fflIl,
A tensile strength i 165 kg/mm2) may be used. However, if only the shape of the bridge girder (6) in Figure 8 is used, the main body (
The upper flange (6]a), which is a component of 61), is weak;
As mentioned above, sideways falling buckling occurs, and in order to prevent this, the sideways falling prevention structure 0■ shown in FIG. 9 is adopted.

Side fall prevention structure 00 consists of two L-shaped steels (ss41!
The main member (10a) (
10a) is the upper flange (61) of the bridge girder (6) main body (61).
a) in a direction perpendicular thereto and fixed with bolts, and each end of four sub-members (10b) (10b) is bolted to each end of this main member (10a) (10a). The other end is fixed to the upper flange (61a).
They are bolted to each other, and the whole structure is a flat summer type. This horizontal collapse prevention structure 00 is a bridge girder (6
) A cross beam (not shown) is attached to the main body (61) and then removed.

The construction method of the present invention is as described above, but when two or more piers are to be constructed, the above-mentioned steps may be repeated and continued, and the construction work may be carried out in accordance with the site conditions.

An example of a structure to which the present invention is actually applied is, as shown in the schematic diagram of FIG.
35 m, height H of the bridge pier; 20 m, width T of the pier; 6 m, width tl of the bridge girder installed between the abutment; 4 m, width t2 of the bridge girder installed between the abutment and the pier; ;2.5m.

As a result, there is no effect even when a 20-ton dump truck is driven, and a 70-ton truck crane with a small rated load can be used. Moreover, the construction period is 17 times longer than with conventional construction methods.
4, and the construction cost is 174 yen compared to the conventional construction method.
It was confirmed that the cost would be .

(Effects of the Invention) The erection method of the present invention is as described above. According to this erection method, preparation, transportation, installation and preparatory work of erection materials such as an erection work tower, cable crane, anchor block, temporary cable, etc. This is a beneficial invention, as it eliminates the need for a lightweight truck crane, which is used as construction equipment, and as a result, the construction period can be shortened, construction costs can be reduced, and construction can be carried out safely and reliably under any site conditions. be.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram showing an overview of the erection method of the present invention, Figs. FIG. 9 is a perspective view showing an example of the basic structure of the bridge girder used, FIG. 9 is a perspective view showing a structure in which the bridge girder used in the construction method of the present invention is attached with a side collapse prevention structure, and FIG. 10 is a structure according to the present invention. It is a schematic diagram showing the dimensional relationship of. The names of the codes are as follows. (1) - Valley, (2) - Both banks of the valley, (3) - Bridge abutment, (4) - Bridge pier, (5) - Truck crane,
(6) - Bridge girder, (7) - Bridge girder support member, (8) - Bridge girder floor material, 0ω - Side collapse prevention structure, (10a) - Main member of side collapse prevention structure, (10b) - - Sub-members of side collapse prevention structure, (61) - bridge girder main body, (61a) - upper flange of bridge girder main body, (62) - column material, (63) - lower chord member. Patent applicant: Shinko Wire Industry Co., Ltd.

Claims (2)

[Claims] (1) Move the structural leg member to the erection position using a traveling crane, then erect it, then stretch the structural girder member to the structural leg member, and then install the next structural leg member. The mobile crane suspending the structure is moved to the position of the leg member for the already erected structure using the structural girder member of the existing frame, and then the leg member for the next structure is erected. In a structure erection method in which the structural leg members are stretched between the side spans of the existing structural leg members, the width of the structural leg members used is such that the width of the structural leg members is sufficient to keep the traveling crane in a stable state. A construction method for a structure such as a bridge, which is characterized by being constructed with a width sufficient to allow it to be placed in a fixed position. (2) The method for constructing a structure such as a bridge according to claim (1), wherein the structural girder member used is a lightweight truss structural girder or a structural girder using high-strength cables.