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Construction method for stratified symmetric synchronous pouring of second lining concrete of tunnel

A technology of simultaneous pouring and concrete, applied in the direction of tunnel lining, tunnel, shaft lining, etc., can solve the problem of uneven distribution of concrete

Inactive Publication Date: 2018-11-23
CHINA RAILWAY SIXTH GRP TAIYUAN RAILWAY CONSTR +3
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Problems solved by technology

[0003] The invention provides a construction method for layered, symmetrical and synchronous pouring of second-lined concrete for tunnels. This construction method has outstanding advantages in solving the uneven distribution of concrete and the phenomenon of honeycomb pockmarks on the surface

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  • Construction method for stratified symmetric synchronous pouring of second lining concrete of tunnel
  • Construction method for stratified symmetric synchronous pouring of second lining concrete of tunnel
  • Construction method for stratified symmetric synchronous pouring of second lining concrete of tunnel

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Embodiment Construction

[0019] Combined with the accompanying drawings, the main points of operation of this construction method will be described in detail.

[0020] Concrete Mix Design

[0021] The design requires the secondary lining of the tunnel to be C35 concrete. Combined with the characteristics of the engineering site and construction tooling, due to the long flow distance, gentle slope and many branches of the chute tooling, high fluidity and anti-segregation performance of the concrete must be considered in the mix ratio design; At the same time, in view of the loss of slurry in the long-distance chute, an appropriate increase in the amount of slurry should also be considered in the design of the mix ratio.

[0022] The mix design adopts the principle of low water-binder ratio and large amount of mineral admixture. Add high-performance polycarboxylate water reducer to reduce the water-binder ratio, improve the cohesion of concrete through low water-binder ratio, and ensure that the concre...

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Abstract

The invention belongs to the field of the mix ratio design and construction of second lining concrete of tunnels and specifically relates to a construction method for stratified symmetric synchronouspouring of second lining concrete of a tunnel. The concrete mix ratio of the method is based on the principle of a low water-to-binder ratio and a large mixing number of mineral admixtures. A polycarboxylate water reducing agent is added to reduce the water-to-binder ratio, and the concrete viscosity is improved through the low water-to-binder ratio to ensure that concrete mixtures are not easilyseparated and stratified under high fluidity working conditions; II-level fly ash is adopted as the mineral admixtures, and under the combined action of a morphological effect of the fly ash and a filling effect of micro-aggregates, a large mixing amount of fly ash is added, so that the fluidity and compaction effect of the concrete are both greatly improved, and the production cost of the concrete is reduced at the same time. A stratified symmetric synchronous pouring distribution tool is adopted, and a multi-window, symmetric, stratified and staggered distribution mode is adopted, so that the uniformity of concrete pouring distribution is improved; the process of cooperatively using an inserted vibrating bar and an attached vibrator is adopted, so that the appearance and quality of the concrete are ensured.

Description

technical field [0001] The invention belongs to the field of mix ratio design and construction of tunnel secondary lining concrete, in particular to a tunnel layered symmetrical synchronous pouring secondary lining concrete construction method. Background technique [0002] At present, due to the frequent accidents caused by the construction quality of the second lining of the tunnel, the construction quality of the second lining concrete of the tunnel has become a key link affecting the tunnel construction. Because there is no uniform standard requirement for the second lining construction tooling, the control of the second lining concrete construction process is chaotic, and the trolley The left, right, front and back pouring are not synchronized, the material is unevenly distributed, the vibration is not compact, cracks, cavities, water seepage and other secondary lining concrete defects occur frequently, which bury hidden dangers for the construction quality. Contents o...

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Application Information

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IPC IPC(8): E21D11/10
CPCE21D11/10E21D11/105
Inventor 李俊宏高山刘艳龙霍志刚杜艳兵吕亮郝利斌赵新平辛俊红白芸戴鹏程张超兵马占洲杨培勇贾美玲王东岩李季张凯张鑫鑫张佳琪郭峰郭伟宏王佳宁
Owner CHINA RAILWAY SIXTH GRP TAIYUAN RAILWAY CONSTR
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