Method for excavating deep foundation pits under temporary bridge of main line railway

A technology for deep foundation pits and bridges, applied in excavation, infrastructure engineering, construction, etc., can solve problems such as inability to meet engineering needs, and achieve the effect of shortening the construction period, reducing the impact of traffic, and meeting construction needs.

Inactive Publication Date: 2012-06-20
CHINA RAILWAY NO 17 BUREAU GRP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

None of the existing engineering technologies or craftwork methods can meet the above-mentioned engineering needs

Method used

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  • Method for excavating deep foundation pits under temporary bridge of main line railway
  • Method for excavating deep foundation pits under temporary bridge of main line railway
  • Method for excavating deep foundation pits under temporary bridge of main line railway

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Embodiment Construction

[0018] The specific embodiment of the present invention will be further described in conjunction with accompanying drawing:

[0019] 1. The span of the construction deep foundation pit is 100m, and the depth of the deep foundation pit is 24m.

[0020] The design speed of the train passing the bridge is 80km / h for passenger cars and 45km / h for freight cars. During the excavation, the slow-moving conditions are used to carry out manual excavation, 45km / h for passenger cars and 25km / h for freight cars. The speed of the freight cars is mainly controlled, and there are no passenger cars at night Mechanical excavation is adopted, and the welding operation is carried out within the closed time of the skylight. Since the direct welding of the scissors brace to the lattice column will affect the mechanical characteristics of the column, the perforated ear plate is used in the skylight point to weld firmly with the lattice column at the scissors brace node. , realize the bolting of the ...

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Abstract

The invention belongs to the technical field of construction of deep foundation pits, particularly relates to a method for excavating deep foundation pits under a temporary bridge of a main line railway, and provides a construction method which is suitable for excavating large-scale deep foundation pits of an existing railway with double underpasses. The method includes steps that earthwork of a deep foundation pit is vertically excavated in a layered manner, the earthwork in each layer is symmetrical in directions from the longitudinal center of the temporary bridge of the main line railway to two ends of the bridge, and is excavated step by step or disorderly, each excavating unit adopts a pier body structural column of the temporary bridge of the railway as a center and extends to pier body lattice columns of two adjacent sides of the temporary bridge of the railway, earthwork is excavated through in a transverse direction relative to the bridge at one step, then step-slope excavation is realized in a longitudinal direction relative to the bridge according to the ratio of 1:1, and a scissors support can be mounted in time in an excavation process, and is used as reinforced concrete ring beams in the local section. The construction method effectively resolves the technical difficult problem of crossed construction of large-scale underground structures, deep foundation pit ranges and railway lines in station modification construction, follows the principle of giving consideration to construction and transportation, reduces influence to driving to the greatest extent, simultaneously meets requirements of construction of newly built projects, and can greatly shorten construction period.

Description

technical field [0001] The invention belongs to the technical field of deep foundation pit construction, and in particular relates to a method for excavating deep foundation pits under trunk railway bridges. Background technique [0002] In the reconstruction and expansion projects of railway stations, when a large-scale line is affected, the plan of changing the line is generally adopted. After the laying of the new line is completed, it will be dialed and opened. However, sometimes due to the influence of terrain, landform or surrounding environment, when the project cannot be changed and transitioned, the new project must be constructed within the scope of the business line, so the stability of the existing line structure and construction safety control are the top priorities in the construction process. [0003] The construction method of conventional overhead railway lines is mainly D-beam construction technology. The line is elevated by setting buttresses to support st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02
Inventor 刘高飞康日兆张学桥李云明王雨涝
Owner CHINA RAILWAY NO 17 BUREAU GRP
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