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Special construction method for dragging main beam of extra-large bridge

A technology for extra-large bridges and main girders, applied in bridges, bridge materials, bridge construction, etc., can solve problems such as construction structures, high technical requirements for equipment, large investment in construction equipment, and difficult construction

Inactive Publication Date: 2020-06-16
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (4) Large investment in construction equipment, high technical requirements for construction structure and equipment
The design and construction of construction structures such as hanging baskets, 0# block brackets, and cast-in-place brackets for side spans are difficult

Method used

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  • Special construction method for dragging main beam of extra-large bridge
  • Special construction method for dragging main beam of extra-large bridge
  • Special construction method for dragging main beam of extra-large bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] The special construction method for the main girder of the Xiatuo Super Bridge, such as figure 1 As shown, the 0# section of the main girder and the cast-in-place section of the side spans of the Xiatuo Super Bridge are constructed by bracket cast-in-place construction, as shown in Figure 7-9 As shown, the cantilever section is constructed with a diamond-shaped hanging basket, and the construction content is as follows:

[0092] Phase 1: Bracket Installation

[0093] 1. For the capping construction of the pier body, install the embedded parts of the bracket and the embedded steel strands.

[0094] 2. After the main pier is capped, the hydraulic climbing formwork is removed, and the platform frame is reserved as a bracket installation and operation platform. The flat bar and inclined bar of the bracket are assembled on the ground, and are temporarily connected by steel cables to form an installation angle. The sling is put on the flat bar, and the posture is roughly t...

Embodiment 2

[0149] This embodiment is optimized on the basis of embodiment 1, such as Figure 4-6 As shown, the construction of the 0# section of the main beam is as follows:

[0150] 1. Bracket design

[0151] The 0# block bracket is the main load-bearing structure of the 0# block box girder concrete cast-in-place. It is required to have sufficient strength and rigidity to drag the 0# section of the main girder of the super-large bridge. , with a weight of 221.3t, poured in two times, and the design of the bracket is considered as one pouring. The main components of the 0# block bracket are embedded anchors, main brackets, side brackets, distribution beams, leveling frames, platform plates, and formwork systems.

[0152] The pre-embedded anchor seat is tailor-welded with δ20 steel plate, embedded in the concrete of the pier body, the exposed part is 45cm long, and the pin hole is reserved for pin connection with the bracket rod. The main bracket is the same as the anchor seat of the s...

Embodiment 3

[0185] The present embodiment optimizes on the basis of embodiment 1 or 2, and the hanging basket construction is as follows:

[0186] 1. Hanging basket design: The hanging basket adopts a diamond-shaped hanging basket. The main components of the hanging basket: it is composed of main truss, bottom formwork platform and hanging system, inner and outer formwork hanging and running system, rear anchorage, inner and outer forms, limit facilities, roofing system, etc.

[0187] 2. Main truss

[0188] Such as Figure 7-9 As shown, the main truss system of the diamond-shaped hanging basket is the main load-bearing structure of the hanging basket, and it mainly bears the vertical tension transmitted from the bottom formwork system in the suspension irrigation construction.

[0189] The main truss of the hanging basket is composed of upper flat bar, lower flat bar, front slanting bar, rear slanting bar, middle beam, bottom mold rear cantilever beam, and oblique support. Each bar is c...

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Abstract

The invention discloses a special construction method for a main beam of a lower dragging extra-large bridge, which comprises the following steps of: S02: 0 # section construction: pouring twice, andforming a support by once pouring; s03, hanging basket construction is conducted, specifically, a hanging basket is moved forwards to the front end of the zero beam section, and the formwork erectingelevation is determined; and erecting a formwork to bind the No.1 beam section steel bars and finish the arrangement of the prestressed pipeline. Aiming at the conditions that the span of a main beamis 200 m, the length of double cantilevers is large, the width-to-span ratio of a box girder is small, and the construction technical difficulty is large when the construction period goes through strong wind seasons and winter, smooth construction is guaranteed, and good practicability is achieved.

Description

technical field [0001] The invention belongs to the technical field of bridge main girder construction, and in particular relates to a special construction method for the main girder of a drag-down extra-large bridge. Background technique [0002] The section from Miguigou to Wari Township on the XV02 line of Lianghekou Hydropower Station is a special project for resettlement first and then construction. The section of the reservoir area is connected with the reconstruction road, and the end point is Wari Township, Daofu County. The total length of the main line is 94.6791km, and the design standard is a fourth-class road. This bidding section is Bid Ⅱ of Miguigou to Wari Township Section of the XV02 County Road Reconstruction in Lianghekou Hydropower Station Reservoir Area. The starting point is K38+050.00 and the ending point is K44+716.51. The total length of the route is 6.68km. The main projects are Xiatuo Super Bridge, exposed road foundation and culverts. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00E01D21/10E01D101/28
CPCE01D21/00E01D21/10E01D2101/28
Inventor 梁朋刚徐少平马天昌常艳花苏春生郝玉峰孟凡伟郭万辉郭建强姜信贺姜波汤振亚孙百峰
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
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