Construction method for newly increasing arched open cut tunnel at railway operating line tunnel portal

A construction method and operation line technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve problems such as low construction efficiency, complicated process, and difficult operation

Active Publication Date: 2010-09-01
THE 2ND ENG OF THE 12TH BUREAU GROUP OF CHINA RAILWAY
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Problems solved by technology

[0004] In order to solve the problems of complex process, difficult operation, low construction efficiency, high safety risk and poor construction quality in the construction method of addi

Method used

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  • Construction method for newly increasing arched open cut tunnel at railway operating line tunnel portal
  • Construction method for newly increasing arched open cut tunnel at railway operating line tunnel portal
  • Construction method for newly increasing arched open cut tunnel at railway operating line tunnel portal

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Embodiment Construction

[0039] A construction method for adding an arched open hole to a railway operation line tunnel, comprising the following steps:

[0040] A. Measurement stakeout

[0041] Before construction, carry out measurement and lofting, check the central mileage and axis position of the pile position and the arched open hole, measure the original ground elevation, and determine the drilling position and depth;

[0042] B. Manual excavation pile construction

[0043] a.Process flow

[0044] Pile hole measurement and positioning→hole digging→reinforced concrete lock→pile body digging→pour retaining concrete→circular footage reaching the design depth→reinforcement cage fabrication and installation→pile body concrete pouring→concrete curing.

[0045] In order to ensure the static acceptance results, during the construction of the excavated piles, the settlement observation of the rails on the line should be carried out.

[0046] b. Construction method

[0047]After the hole pile position...

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Abstract

The invention relates to the field of tunnel construction, in particular to a construction method for newly increasing an arched open cut tunnel at a railway operating line tunnel portal. The construction method solves the problems that the conventional construction method for newly increasing the arched open cut tunnel at the railway operating line tunnel portal has complex process, difficult operation, low construction efficiency, large safety risk, poor construction quality and the like. The construction method comprises the following steps of: surveying setting-out, construction of manually digging hole piles, fiber concrete slab prefabrication, joist construction, processing and assembly of an H profile steel frame, short side wall construction, arch construction of the arched open cut tunnel, end-sealing concrete construction and the like. The fiber concrete slab and the profile steel frame form an integral structure, so the stability is good, and the safety is ensured; the method avoids formwork removal operation after arch concrete pouring is finished, simplifies the construction process, accelerates the construction progress, and has considerable economic benefit; the profile steel frame is uniformly processed in a processing factory and pre-assembled and hoisted on site so as to shorten the operation time and improve the construction efficiency; and the fiber concrete slab is prefabricated in the factory and then arranged on site, so the arched open cut tunnel has surface finish and attractive appearance.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for adding an arched open hole at a tunnel entrance of a railway operation line. Background technique [0002] The tunnel groups of the railway operation line are generally connected by short-circuit foundations or single-span bridges, and the slopes on the top of the tunnels are generally high slopes. If the high slopes have hazards such as landslides and rolling stones, it will endanger the operation safety of the railway. , the most effective way is to add an arched open hole at the entrance of the high slope tunnel, which is generally divided into two types, namely: two openings are connected by an arched open hole, and a single opening is extended by an arched open hole. [0003] The new arched open hole at the tunnel entrance of the railway operation line is a safety enhancement measure, and the safety of the operation line must be ensured during the...

Claims

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Application Information

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IPC IPC(8): E21D9/14
Inventor 霍玉华雷军杨新兴王兴林刘冰晖郝文广卜军门瑞龙原旭峰冯国利郭晓亮李广伟王林郝伟郭强赵朋宪
Owner THE 2ND ENG OF THE 12TH BUREAU GROUP OF CHINA RAILWAY
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