TGRM subsection moving-on type advanced deep hole grouting construction process

Abstract

The invention relates to a TGRM segmental advancing-type leading deep-hole grouting construction process. The construction process comprises the following steps that: a slurry stop wall is made first; a hole is drilled on the set hole position; an orifice pipe is arranged in the drilled hole; a drill bit is replaced; first-segment drilling is carried out through the orifice pipe; after a depth is reached, the drilling is stopped and a drilling tool is withdrawn; grouting corollary equipment is arranged on the orifice pipe, so as to inject TGRM cement-based special grouting material into stratum; after a grout soil body reaches certain strength, the grouting equipment is removed, and second-segment drilling is carried out through the orifice pipe; the two segments of drilling are repeated till the set hole depth is reached; and then the steps are carried out to another hole position till all grouting holes are completed. The construction process has the advantages that: aiming at subsurface tunnels, in particular to tunnels of which an arch part is positioned in an unbonded and in low self-stability sand layer and other stratum and passes through the bottom of a building, segmental advancing-type leading deep-hole grouting is carried out to the stratum, which can comprehensively reinforce the stratum, so as to further slow down or avoid the settlement after the stratum is destroyed and the damage to buildings (constructed objects).

Description

technical field [0001] The invention refers to a TGRM step-by-step advanced deep hole grouting construction technology. As a necessary and effective means of preventing subsidence in construction, it is suitable for projects where the soil needs to be pre-reinforced at the beginning of construction of underground excavation tunnels. Especially for structures that pass through the bottom of buildings and pass through structures with strict settlement requirements (such as railways, rail transit, bridges, highways, etc.), the tunnel structure is in a sand layer and gravel (pebble) layer with no bonding, poor self-stabilization, water-containing Sand layer and loose geological soil layer. Background technique [0002] At present, the common grouting process is the double-tube grouting process. The double-tube grouting technology is to use a double-tube drilling rig to drill a hole to a predetermined depth and then carry out retreating grouting from the hollow drill pipe. The g...

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Problems solved by technology

Its disadvantage is that this construction method uses drill pipe grouting, and there must be a gap between the drill pipe and the grouting hole, which will easily cause the grout to flow back during grouting, which wastes materials and cannot guarantee the grouting effect. Therefore, the double pipe grouting process adopts The grouting material is quick-setting cement-sodium silicate double liquid slurry (setting time within 1 minute) to prevent the backflow of the slurry, but the effective strength of the double liquid slurry can only be maintained for about a week, so the double pipe Grouting is only suitable for temporary grouting reinforcement that does not require a long time for the grouting reinforcement effect, and is not suitable for grouting reinforcement projects that require high settlement at the bottom of structures

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