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Process for grouting on back of shield segment

A technology of back grouting and shield segments, applied in shaft lining, tunnel lining, underground chamber, etc., can solve uneven settlement of strata, uneven filling of stratum voids, and difficulty in effectively ensuring full filling of shield tail building voids, etc. problems, to achieve the effect of ensuring safe and smooth progress, preventing flow and loss, and safe and convenient grouting effect

Inactive Publication Date: 2013-09-18
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The original grouting process behind the shield segment only uses the shield synchronous grouting method, which is difficult to effectively ensure that the voids in the shield tail are filled. uniform settlement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The applicant is in the shield section between Zhongyuan East Road Station and Zhengzhou Railway Station Station in the first phase civil engineering project of Zhengzhou Metro Line 1. The shield tunnel needs to pass through the West Railway Community after excavating 210 meters from the west end of Zhengzhou Railway Station Station. This community Residential buildings are all brick-concrete structures with enlarged strip foundations. The construction period was from the 1970s to the early 1990s, and the buildings' anti-disturbance ability is poor. The thickness of the covering soil at the top of this section of the shield tunnel is 12.6-14.1m. The strata within the scope of the shield tunnel are mainly: No. 14 silt layer and No. 29 silt layer. The silt layer is mainly distributed in the upper half of the tunnel, and the groundwater level is buried deep Located in the lower part of the tunnel.

[0037] The new shield segment back grouting process is adopted in this ten...

Embodiment 2

[0061]The applicant is in the section 03 of the first phase civil engineering project of Zhengzhou Metro Line 1, Zhengzhou Railway Station to Erqi Square Station shield section, the shield excavation is 45 meters from the east end of Zhengzhou Railway Station, and the mileage is CK18+98.13~18+350.4 The 252.27-meter section needs to cross 5 Longhai Railway Tracks of Zhengzhou Railway Station and 16 Beijing-Guangzhou Railway Tracks with a width of about 150 meters. Tiebei Station Tunnel and many brick-concrete houses of the Railway Bureau. The thickness of the covering soil at the top of this section of the shield tunnel is 14.4-16.1m. The stratum within the crossing range of the shield tunnel is mainly: No. 14 silt, No. 29 silt, and No. 29-1 silt layer. The silt layer is mainly distributed on the tunnel In the first half and the lower half, the groundwater level is buried at a depth of 10.5m, located above the top of the tunnel, and the hydrogeological conditions are poor.

[...

Embodiment 3

[0086] The applicant is in the shield tunneling section between City Gymnasium Station and Zijingshan Station in the first phase civil engineering project of Zhengzhou Metro Line 1. The shield tunnel needs to pass through the Zijingshan Department Store. ,Framework. The thickness of the covering soil at the top of the tunnel here is 16m, and the geological conditions within the tunnel range are water-rich silt sand layers.

[0087] The project of this tender section adopts a new shield segment back grouting process, the grouting is even and full, and the ground settlement is well controlled. The maximum cumulative building settlement is only 8.6mm, which is less than the 30mm allowed by the design and specifications.

[0088] The specific process steps of this tender project are as follows:

[0089] (1) Synchronous grouting process: through the synchronous grouting system of the shield machine itself, it is carried out while the shield is advancing forward to form a gap at th...

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Abstract

The invention discloses a process for grouting on the back of a shield segment to control stratum settlement in shield tunnel construction. The process comprises steps of synchronous grouting, secondary grouting and a special treatment process; during synchronous grouting, when a shield advances and a shield tail is formed, a grouting pump of a shield tunneling machine is used for symmetrical grouting through a synchronous grouting system of the shield tunneling machine; during secondary grouting, double grout is injected to the back of the segment through a shield segment secondary grouting hole, and a gap on the back of the segment is subjected to secondary filling and compression; and the special treatment process comprises steps of adding a triallyl cyanurate (TAC) high-molecular polymer material solution and pressing and injecting epoxy resin seal reinforcing rings. By the process, particularly the TAC high-molecular polymer is added to improve a soil layer and the epoxy resin reinforcing rings are pressed and injected to reinforce the stratum in the special treatment process, the grouting effect is good in a safe and convenient way, the flow and loss of the grout are prevented, the grouting plumpness is ensured, the soil body can be well improved, the stratum is reinforced, the settlement amount is effectively controlled, and the shield tunneling construction is safely and smoothly carried out.

Description

technical field [0001] The invention relates to a stratum subsidence control technology applied in the construction process of a shield tunnel, in particular to a back grouting technology of a shield segment under complex conditions of surrounding buildings (structures) and complex geological conditions. Background technique [0002] During the construction of shield tunneling, the formation loss caused by shield tunneling, the reconsolidation of disturbed or shear-damaged reshaped soil around the shield tunnel, and the infiltration of groundwater are important reasons for surface subsidence. In addition, due to the construction method of the shield tunnel, there are construction gaps between the segment and the surrounding rock, resulting in a large amount of leakage water and groundwater intrusion into the surrounding area of ​​the tunnel, which is not conducive to the safe construction of the tunnel. [0003] In order to reduce and prevent stratum subsidence, during shiel...

Claims

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Application Information

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IPC IPC(8): E21D9/06E21D11/10
Inventor 郭磊宋书显罗维
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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