Shield construction method, construction working face thereof and mixed pile body in working face
A construction method and technology of hybrid piles, which are applied in foundation structure engineering, sheet pile walls, earthwork drilling and mining, etc., can solve the problems of pile body strength influence, large effort, unfavorable construction, etc., so as to prolong the service life and avoid the later stage Operational disease problems, the effect of increasing injectability
Active Publication Date: 2020-07-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology
[0002] With the development of my country's national central city strategy, more and more urban subway tunnels have begun to be built; due to the wide distribution of loess strata in my country, more and more subway tunnels need to be built in loess strata; Shallow, so many tunnel sections are in the collapsible loess stratum. This kind of loess stratum is soaked and subsidence, which will have a great impact on the deformation and stress of the subway tunnel structure. Therefore, it is necessary to carry out loess tunnel foundation treatment before construction; The traditional treatment method is to set all the cement mixing piles. It will take a lot of effort to excavate these cement mixing piles in the subsequent excavation of the shield machine, and at the same time, it will have a great impact on the strength of the entire pile body. , which is not conducive to subsequent construction; therefore, an improved construction method needs to be proposed
Method used
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[0033] The invention will be further described below in conjunction with the accompanying drawings.
[0034] see figure 1 , a shield construction method, comprising the following steps:
[0035] Step 1. According to the survey and design data, determine the area that the tunnel plans to pass through; design the mixed pile body 7 and the full cement mixing pile 4 according to the area planned to pass through the tunnel, the thickness of the loess strata that is planned to pass through, and relevant construction regulations. Pile length, pile diameter, pile position and pile spacing, formulate a pile layout plan; design the length of the tunnel lining segment 5 and the position of the grouting hole 6 on the tunnel lining segment 5;
[0036] Step 2. According to the pile position of the mixed pile body 7 in the pile layout plan, set the mixed pile body 7 in the current construction area, specifically including the following contents:
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The invention discloses a shield construction method, a construction working face thereof and a mixed pile body in the working face. During construction, the mixed pile body through which a tunnel isplanned to pass is divided into three sections for sequential construction; after the pile body construction is completed, the shield excavation is performed, and tunnel lining segments are driven toform the tunnel; the mixed pile body is divided into a bottom gravel pile, a middle sand pile and a top cement mixing pile; and during construction, a full-cement mixing pile through which the tunnelis not planned to pass is taken as a whole and is completed through one-time construction. The shield construction method can reduce construction difficulty, improve construction efficiency, take intoaccount construction safety, and can also improve the groutability of grout and prolong the service life of grouting equipment.
Description
technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a shield construction method, a construction work surface and a mixed pile body in the work surface. Background technique [0002] With the development of my country's national central city strategy, more and more urban subway tunnels have begun to be built; due to the wide distribution of loess strata in my country, more and more subway tunnels need to be built in loess strata; Shallow, so many tunnel sections are in the collapsible loess stratum. This kind of loess stratum is soaked and subsidence, which will have a great impact on the deformation and stress of the subway tunnel structure. Therefore, it is necessary to carry out loess tunnel foundation treatment before construction; The traditional treatment method is to set all the cement mixing piles. It will take a lot of effort to excavate these cement mixing piles in the subsequent excavation of the s...
Claims
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IPC IPC(8): E21D9/00E21D9/06E02D3/08E02D5/46
CPCE21D9/001E21D9/0607E02D3/08E02D5/46
Inventor 张玉伟宋战平王剑常运超段锋张峰薛晓宏
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY