A full-face rock formation construction method in which the mud-water shield develops cracks

A technology of mud-water shield and construction method, which is applied in earth-moving drilling, shaft equipment, wellbore lining, etc., can solve problems such as operation affecting the safety of tunnels, increase the cost of human, property, and water leakage of tunnel segments, and achieve enhanced Waterproof effect, increase the mud circulation flow, reduce the driving speed effect

CN111779493BActive Publication Date: 2021-12-21ERCHU CO LTD OF CHINA RAILWAY TUNNEL GRP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-12-21

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Abstract

The invention discloses a method for constructing a mud-water shield in a full-face rock stratum in which fissures develop, comprising the following steps: step 1, setting a water-stop hoop at the tail of the shield 3m before the fissure zone; step 2, the process of crossing the fissure zone In the process, strictly control the tunneling parameters and operation methods, review the posture of the shield machine and segments, reduce the initial setting time of mortar, and increase the proportion of mud; step 3, add grouting hole segments, and use full-length channel steel for tensioning ; Step 4, after passing through the 3m range of the fissure zone, set up a water-stop hoop at the tail of the shield; Step 5, after all the shield machine trailer equipment passes through the fissure zone, perform backfill grouting on the back of the fissure zone and the front and rear 5 ring range segments; Step 6, carry out deep hole grouting in the formation, and reinforce the cracks in the rock formation. The beneficial effect of the construction method of the mud-water shield in the full-section rock formation with developed fissures of the present invention has the characteristics of strong practicability, simple operation, effective protection of shield excavation safety, quality of formed tunnels, and safety of trains during operation, etc.
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Description

technical field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a full-section rock layer construction method in which a mud-water shield develops in cracks. Background technique

[0002] In recent years, with the rapid development of cities, there are more and more rail transit constructions in cities. The shield tunneling method has been widely used in the construction of urban rail intervals because of its fast construction and little impact on the ground. The shield machine is a special engineering equipment for tunnel excavation. It has the functions of excavating and cutting soil, conveying soil muck, assembling tunnel lining, measuring, guiding and correcting deviation. In cities on both sides of the river, it is often necessary for the muddy water shield machine to pass through the river. If it encounters a full-section rock formation with developed cracks, it is easy to cause difficulty in slag discharge, the ...

Examples

Embodiment Construction

[0057] Such as Figure 1-3 , the construction method of the full-section rock strata in which the mud-water shield develops in the crack; comprises the following steps:

[0058] Step 1, preset the water stop hoop:

[0059] The cutter head of the shield machine (not shown in the figure) is stopped 2-5m away from the fissure zone area 1, and the optimal distance area is 3m. At least three annular water-stop hoops 5 are successively arranged at the tail of the shield machine to prevent shield When the mechanism passes through the fracture zone area, the groundwater passes through the fracture zone area to dilute the mortar on the back of the segment 3, causing the segment 3 to float up and be damaged.

[0060] Step 2, the shield machine passes through the fissure zone area:

[0061] Step 2.1, according to the actual situation of the formation, appropriately reduce the speed of the shield machine cutterhead and the tunneling speed, reduce the cutterhead speed: 1.7r / min→1.2r / min,...