Overpass top-down construction method suitable for loess area

A construction method and regional technology, applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve problems such as high cost, high safety risk, and long time, so as to reduce construction cost, reduce construction safety risk, and shorten construction time. The effect of duration

Pending Publication Date: 2020-01-17
CHINA CONSTR SEVENTH ENG DIVISION CORP LTD
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Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an inverse construction method for flyovers suitable for loess areas, which effectively solves the problems of long time, high cost and high safety risks in the construction of flyovers and construction of convenient bridges and supports. question

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  • Overpass top-down construction method suitable for loess area
  • Overpass top-down construction method suitable for loess area
  • Overpass top-down construction method suitable for loess area

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Embodiment Construction

[0020] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] Construction steps of the present invention are:

[0022] Step 1. Road maintenance: Excavate the cutting earth near the side of the mountain to the elevation of the original road surface, then widen and harden the side to form a parallel temporary access road on the side of the original road; after the access road is formed, use standardized Railings isolate the construction area from the access road, and set warning signs;

[0023] Step 2. Pile foundation construction: Excavate pile holes at the bridge pier, the diameter of the pile holes is the same as that of the pile foundation; then bind and weld the pile foundation reinforcement cage skeleton near the pile holes, and hang them into the holes one by one, and connect the main reinforcement between the nodes Use straight thread mechanical connection technology...

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Abstract

The invention relates to an overpass top-down construction method suitable for a loess area. The overpass top-down construction method effectively solves the problems that the time for erecting a temporary bridge and constructing a support in the overpass construction is long, the cost is high, and the safety risks are high. According to the technical scheme, the method aims to adjust an overall construction procedure and optimize a construction process, and comprises the steps of firstly widening an original road at the position of an overpass; forming holes in the overpass pile foundations in a manual hole digging manner; during the hole forming process, increasing the pier stud top elevation to the pile top elevation diameter; reserving the pier column construction space, simulating underwater concrete pouring pile forming through a guide pipe for the pile foundation, carrying out steel formwork sectional construction on the pier columns, reserving the tie beam steel bar joints during pier column steel bar machining, after pier column construction is completed, carrying out the box girder, anti-collision wall, bridge deck pavement and other upper structure construction, and thencarrying out earth excavation after the overpass is opened to traffic. The construction method can effectively shorten the construction period and reduce the construction cost and the construction safety risk.

Description

technical field [0001] The invention relates to the field of overpass construction in loess areas, in particular to an inverse construction method for overpasses suitable for loess areas. Background technique [0002] With the rapid expansion of the scale of infrastructure construction in our country, the connection between villages has become closer, and the difficulty of field construction has become more and more difficult. As an important channel connecting villages on both sides of the road, overpasses are more common in highways. It is also relatively mature. The construction of traditional deep-cut road bridges is generally: earthwork excavation → pile foundation → pier column → erection of support → pouring box girder. [0003] During the construction of the overpass, in order to ensure the normal passage of the original road and reduce the interference to the surrounding residents, it is generally necessary to build a detour or a steel trestle to ensure the normal p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00E01D1/00
CPCE01D1/00E01D21/00
Inventor 杨伟许保生齐宁宁吴靖江张浩蔡喜雷秦亚丽张晓川周真真
Owner CHINA CONSTR SEVENTH ENG DIVISION CORP LTD
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