New inert grout and combined grouting technology for shield tunneling in upper soft and lower hard water-rich strata

A combined grouting technology for water-rich strata, applied in underground chambers, shaft equipment, wellbore linings, etc., can solve problems such as untargeted grouting methods, excessive water seepage in front of the face, and affecting the stability of the face , to achieve the effects of small consolidation volume shrinkage, increased slurry cost, and repeated filling

Active Publication Date: 2019-08-02
URBAN MASS TRANSIT ENG CO LTD OF CHINA RAILWAY 11TH BUREAU GRP +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, when the existing secondary grouting is used as a water-stop ring, the double-liquid grouting of the entire cross-section is carried out, that is, all the grouting holes in the continuous number of rings on the entire circle are grouted to form a water-stop ring. Ring, the grouting method is not targeted, the grouting time is too long, resulting in too long downtime, too much water seepage in front of the face, affecting the stability of the face

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • New inert grout and combined grouting technology for shield tunneling in upper soft and lower hard water-rich strata
  • New inert grout and combined grouting technology for shield tunneling in upper soft and lower hard water-rich strata
  • New inert grout and combined grouting technology for shield tunneling in upper soft and lower hard water-rich strata

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: This example is aimed at Section 3 of Hefei Metro Line 2. The shield section includes a soft top and bottom hard, full-faulted flour-soil silt stratum, and it is close to the Feihe River. The groundwater content is rich and the shield construction is difficult. Larger. During the construction of other bid sections with similar geology, ground subsidence and collapse occurred continuously, and many emergency incidents occurred. The inventors used the method of the present invention to perform combined grouting. There was no settlement exceeding the limit in this bid section. The specific process steps are as follows :

[0035] (1) Prepare a new type of inert grout for simultaneous grouting: prepare the materials for the simultaneous grouting grout according to the following formula:

[0036]

[0037]

[0038] Among them, fly ash soil uses bulk fly ash, the above materials are mixed with general mixing equipment, fly ash uses bulk fly ash, pay attention to strictly...

Embodiment 2

[0044] Example 2: The stratum lithology in the interval between Shijing Station and Tinggang Station in Biao 8 in Guangzhou has changed greatly. The top of the tunnel structure is mainly composed of alluvial and alluvial sand layers, and the alluvial soil layer is in the residual soil layer. The bottom of the tunnel is mainly Located in the strong weathered rock layer and rock slightly weathered layer, it is shown as the upper soft and lower hard stratum, which is prone to surface deformation, and the environment along the shield tunnel is complicated. It is necessary to pass through the houses along the street of Hongxing East 1st Lane, Hongxing Bridge, postal building, Sanfu Office buildings, rivers, etc., in order to ensure the safety of shield construction and avoid the risks caused by settlement, in January 2017, the combined grouting process in the present invention was adopted to ensure that the entire construction was safe and controllable, and the settlement was within t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides shield novel inert slurry used for an upper-soft and lower-hard water-rich stratum and a combination grouting technology. The combination grouting technology comprises the stepsthat firstly synchronous grouting novel inert slurry is prepared, then conveyed to a shield backup trolley through a slurry transportation vehicle and pumped to a trolley slurry storage tank, and finally injected into the shield tail through a synchronous grouting pump, and synchronous grouting is completed; and in the shield construction process, the water content of muck is observed simultaneously, through change of the muck water content and a formation analysis result, when it is discovered that the source of water in a soil warehouse is incoming water in the rear of a tunnel, shield driving is stopped, according to the point position corresponding to a rock-soil interface, grouting holes, closest to the rock-soil interface, in two rings of continuous shield segments, meeting the grouting conditions, in the fifth to eighth rings in the rear of the shield tail are selected to serve as secondary grouting holes, and secondary fixed-point grouting is conducted by adopting binary slurry. According to the shield novel inert slurry used for the upper-soft and lower-hard water-rich stratum and the combination grouting technology, the construction cost is low, the effect is good, the phenomenon of water leakage of a tunnel structure can be basically eradicated, the phenomena of segment upward floating or faulting of slab ends are few, and the later-period leaking stoppage and repairing cost of the tunnel is greatly reduced.

Description

Technical field [0001] The invention relates to the technical field of tunnel shields, in particular to a new type of inert grout and combined grouting technology for shields used in upper soft and lower hard water-rich formations. Background technique [0002] Shield synchronous grouting technology means that in the process of shield construction, after the tunnel lining segments are assembled, the tunnel is pulled out of the shield tail at the same time, under a certain grouting pressure, a certain amount of early strength and final strength The grouting material is filled into the gap behind the shield tail, and after it is consolidated and hardened, it can fill the gap in the building behind the wall, provide a certain bearing capacity, and stabilize the lining of the segment. The types of shield tail grouting are divided into post grouting, synchronous grouting, timely grouting and secondary grouting. In the case of stricter requirements for ground settlement control and tun...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/38C04B28/12
CPCC04B28/12E21D11/105E21D11/38C04B7/00C04B14/06C04B18/08C04B14/104
Inventor 廖剑平杨卫朋冉团伟唐生朝肖清安
Owner URBAN MASS TRANSIT ENG CO LTD OF CHINA RAILWAY 11TH BUREAU GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap