take Grouting pipe Embedded in new and old concrete In cold joints or around any other structural joints, expansion joints, wall pipes as well as partition On. Any water leakage defect concealed in these joints can be waterproof The leakage system is set at the PVC port on the surface to inject water activated slurry seal up Plugging. The advantages of subway tunnel grouting pipe are multiple grouting, and grouting is not limited by time. As long as there is water leakage, grout can be injected into the pipe for filling and sealing. The outer diameter of the grouting pipe is 48mm, and its inner layer is a PVC pipe body. There are regular parallel grout outlets on the whole pipe body. 　

The inner layer of grouting pipe is PVC pipe body, and the middle layer is elastic Rubber sealing strip Its function is to protect the grout outlet. When the grouting pipe is embedded in the construction joint, it can prevent the fine particles in the concrete from entering the pipe body. When the grouting pipe is used for grouting, it can be opened under a certain internal pressure so that the liquid can flow out evenly.

The core framework of the multiple grouting pipe (also known as the repeatable grouting pipe) is mainly made of high-grade plastics (PVC and PP), which has good flexibility. The pipe body is evenly provided with four slurry discharge holes and a one-way starter switch Functional Foam strip , play the role of full section grouting to prevent mortar Block the slurry outlet. When water seepage occurs in the construction joint, grouting repair can be carried out in time. The grout with pressure will compress the foam strip and inject it evenly into the gap of the concrete construction joint to block the leakage water.

Sleeve valve pipe grouting method is to inject (press) grout into the rock soil layer through greater pressure. Blockers above and below the grouting core pipe can realize sectional and layered grouting, and connection or skip section grouting can be selected according to the construction needs. In the construction requiring full process grouting, this method can achieve good grouting reinforcement effect for both loose and dense strata through sectional grouting, avoiding the occurrence of large amount of grouting in loose strata and no grouting in dense field strata when the former grouting technology exists simultaneously in loose and dense strata.

Applicable scope of sleeve valve pipe grouting

This method is applicable to soil reinforcement works in railway, highway, municipal and housing construction fields. Mainly used in:

(1) For loose, silty clay . Consolidation of miscellaneous fill soil layer or loose soil layer such as sand layer and pebble layer, mainly consisting of construction waste and containing a small amount of crushed stones and block stones;

(2) Reinforcement of tunnel portal when the shield machine starts and arrives;

(3) Make up for the gap caused by the partial non occlusion of rotary jet grouting pile and mixing pile or poor pile forming effect;

(4) Broken zones or cavities appear in the stratum due to excessive separate excavation in the filling mining area, reducing the compressibility of rock and soil layers, so as to reduce the settlement and deformation of surrounding buildings;

(5) Reinforcement to prevent cracks or settlement of subgrade;

(6) Make anti-seepage treatment around the deep foundation pit.

Characteristics of sleeve valve pipe construction method

(1) It is generally used for surface grouting within 50m, both vertical and horizontal grouting;

(2) There are two stoppers at the top and bottom, which can limit the grout to any section for grouting and achieve the purpose of sectional grouting;

(3) The stopper can move freely in the sleeve valve tube, and can be repeatedly grouted in the grouting area as required;

(4) According to the stratum characteristics, different grouting materials can be used in the same sleeve valve pipe, and different grouting parameters can be selected for grouting;