JPH0546406B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for constructing the arch section of a reinforced concrete fixed arch bridge, and particularly for a long span bridge, for example, a reinforced concrete fixed arch bridge with an arch span exceeding 100 m. This relates to erection technology.

[Conventional technology]

Many reinforced concrete fixed arch bridges 1 as shown in FIG. 3 have been recently constructed from the viewpoints of excellent scenery and rational mechanical structure of the completed bridge.

This reinforced concrete fixed arch bridge 1 supports a bridge surface 3 by arch ribs 2. The construction method of this arch rib 2 has a great influence on the construction efficiency and economic efficiency of the entire bridge. Archrib construction methods include full shoring method, center method, melan method,
Piron method etc. are known, but the applicant has
We have developed a synthetic arch winding method that is superior to these and have already disclosed it (Japanese Patent Application Laid-Open No. 178009/1983).

The outline is as shown in Figure 2. (a) Approximately 1/2 portion 5 of the steel pipe arch 4 on both banks.
is assembled upright, and this steel pipe is installed by lowering approximately 1/2 part 5 of the arch from both banks and lowering it to the arch rib axis.

(b) After erection, the steel pipe will be filled with concrete to create a composite structure (synthetic arch).

(c) After the springing section is placed using shoring, concrete is successively rolled up using a work vehicle (Wagen) using the synthetic arch as shoring material.

This is the construction method. Although this construction method has excellent features, in the case of long bridges with arch spans exceeding 100 m, when the above-mentioned steel pipes are erected along the arch rib axis, long steel pipe arches must be erected on both banks. It will be assembled and then lowered. In this case, the height of the built-in steel pipe arch before lowering becomes high, making assembly, installation, and lowering difficult.

In other words, it is necessary to have a mechanical structure that can withstand wind pressure, earthquakes, buckling, etc. during erection and assembly, resulting in a complex and heavy structure.The load when lowering this is large, requiring large-scale equipment, and it is not economical. This results in the loss of sexual benefits.

[Problem to be solved by the invention]

The present invention provides a rational steel pipe that takes full advantage of the advantages of the above-mentioned synthetic arch winding method and solves the problems that arise even when the span of the arch section is 100 m or more. The purpose of this project is to develop and provide a method for constructing an arch.

[Means to solve the problem]

The present invention has focused on the fact that steel pipe arch ribs have approximate curvatures, and has solved the above problem by assembling the steel pipe arch into a short length before lowering, and creating a structure that can be extended after or during the lowering process. That is, the method of the present invention consists of a combination of the following technical means.

(a) To erect a steel pipe arch at the location where the steel pipe arch of the springing section is to be erected. In this case, the steel pipe member is divided into multiple parts in the length direction, and each divided member is held in the base member. make it last There are two types of holding methods: (i) internal storage method, and (ii) external attachment method.

(b) Roaring.

(c) During or after lowering, the central member is sequentially fed out from the base member and joined to the tip of the base member.

[Effect]

If long members are erected and assembled, a heavy steel pipe arch must be designed to handle loads such as wind pressure, seismic force, and buckling, making construction difficult and uneconomical.

According to the present invention, such a heavy structural design is not required, and a long span reinforced concrete fixed arch bridge can be constructed with a short design, such as by reducing the erection height to half or one-third of the height. Become. Therefore,
It has become possible to significantly expand the scope of practical application of long-span reinforced concrete fixed arch bridges.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which (a) a step of erecting a base member 11 with a central member 12 built into the base member 11 and lowering the base member 11; Step (c) of extending the central member 12 shown in FIG.

〔Effect of the invention〕

According to the present invention, it has become possible to construct a long span reinforced concrete fixed arch bridge using the synthetic arch wrapping method.

[Brief explanation of the drawing]

FIG. 1 is a process diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the synthetic arch winding construction method, and FIG. 3 is a side view of a reinforced concrete fixed arch bridge. 1... Fixed arch bridge, 2... Arch rib, 3...
... Bridge surface, 4 ... Steel pipe arch, 11 ... Base member,
12...Central member.

Claims (1)

[Claims] 1. When constructing a steel pipe arch using the synthetic arch winding method for a reinforced concrete fixed arch bridge, the steel pipe member is divided into a base member and one or more central members in the length direction, and the divided central member is used as the base member. Holding the base member, the base member is erected at the springing part at the construction position, and then the base member is lowered, and during or after the lowering, the central member is drawn out from the base member and coupled to the tip of the base member. A distinctive method for constructing steel pipe arches.