Construction method of railway subgrade support during jacking of frame bridges passing under railway
A technology of railway subgrade and construction method, applied in the directions of roads, buildings, tracks, etc., can solve problems such as hidden safety hazards and inability to implement protection schemes, and achieve the effects of convenient construction, remarkable supporting effect, and reasonable design.
Active Publication Date: 2018-08-24
CHINA RAILWAY 19 BUREAU GRP CO LTD +1
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is: in order to solve the problem that during the jacking process of the jacking frame bridge, the operation of some protection schemes is easily restricted by the soil quality and construction space and cannot be implemented, and there are safety hazards in the schemes that can be implemented
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[0038] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0039] In the description of the present invention, it should be noted that, unless otherwise stated, the scope of "above" includes the number, and the meaning of "plurality" is more than two; the terms "upper", "lower", "left", " The orientation or positional relationship indicated by "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of It is convenient to describe the present invention and simplify the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate ...
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The invention belongs to the technical field of railroad underpass bridge jacking construction and discloses a construction method for supporting and protecting a railway roadbed in the jacking process of a railroad underpass bridge jacking and crossing beneath a railroad. By pouring pile foundations on both sides of an existing roadbed, burying anchor cables under the existing roadbed and tensioning the anchor cables on the pile foundations, the protection for the existing roadbed is achieved. By using a pile-anchor structure, the construction method has the advantages of simple structure, reasonable design, higher integrity of a supporting and protecting structure and high stress performance. The anchor cables can apply prestressing force to control the deformation of the supporting and protecting structure and reduce the influence on surrounding buildings; and the magnitude and the acting point of the prestressing force can be adjusted according to needs. The structure buried under the railway roadbed of the anchor cables offsets the side pressure of the railway roadbed, and vertical excavation can be carried out without the need for the step-slope of a side skylight in the course of jacking, so that the construction space is increased and the jacking construction is more convenient. The supporting and protecting structure has the advantages of simple structure, convenient construction and significant supporting and protecting effect, so that the hidden danger of roadbed collapse is avoided and the engineering safety is improved.
Description
technical field [0001] The invention relates to the technical field of railway jacking frame bridge construction, in particular to a construction method for railway subgrade support during the jacking process of a railway jacking frame bridge passing under it. Background technique [0002] With the rapid development of economy and society, the passenger and freight volume of railways has also increased significantly. The transport capacity of a large part of the existing railways can no longer meet the needs of transportation growth, and must be expanded and transformed. In the process of building the second line of the railway business line, there are more and more projects crossing the existing railway. Because the jacking frame bridge crosses the existing line and the foundation pit is deep, the existing railway roadbed is likely to collapse during the jacking process of the jacking frame bridge. risk, seriously threatening the safety of railway operations. At present, t...
Claims
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IPC IPC(8): E01B2/00
CPCE01B2/00
Inventor 张华
Owner CHINA RAILWAY 19 BUREAU GRP CO LTD