Construction method of existing railway tunnel overhaul polyurethane plugging agent high-pressure grouting

It is an existing railway and high-pressure grouting technology, which is applied to tunnels, tunnel linings, shaft linings, etc. It can solve the problems of reduced lining strength, tunnel structure cracks, impact on building structure durability, and hidden dangers of driving safety, so as to save product usage, The effect of shortening the construction period and improving operability

Inactive Publication Date: 2019-07-19
CHINA RAILWAY NO 9 GRP NO 7 ENG CO LTD +1
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  • Abstract
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Problems solved by technology

[0002] Due to the long-term freeze-thaw cycle and the corrosion of chemical smoke generated by the internal combustion engine, the lining strength of the existing line tunnel is reduced and structural cracks appear in the tunnel, resulting in a large amount of water leakage in the tunnel, which brings great safety hazards to traffic and affects the entire building structure durability
Conventional treatment methods ma

Method used

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  • Construction method of existing railway tunnel overhaul polyurethane plugging agent high-pressure grouting
  • Construction method of existing railway tunnel overhaul polyurethane plugging agent high-pressure grouting

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Embodiment Construction

[0016] Such as figure 1 As shown, a method of high-pressure grouting with polyurethane plugging agent for the overhaul of existing railway tunnels, the steps are as follows: 1) Surface cleaning: clean the construction area, chisel and remove precipitates on the concrete surface to ensure that the surface is clean;

[0017] 2) Drilling: Use a drill bit to drill pressure relief holes around the hole, the drill bit diameter is 12mm, the drill bit angle is less than or equal to 45°, the drilling depth is less than or equal to two-thirds of the thickness of the structure, and the distance from the crack is 50-150mm, along the two sides of the crack direction Drill holes crosswise and dislocation in layers;

[0018] 3) Embedding needles: Observe the pressure of the main leakage hole. When the water flow is not urgent and the pressure is not high, the quick-drying leak plugging agent can be used to bury the grouting water-stop needles; Tighten with a special inner hexagonal wrench, ...

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Abstract

The invention relates to a construction method of existing railway tunnel overhaul polyurethane plugging agent high-pressure grouting. Existing railway cracks are plugged and grouted by cleaning the surface, drilling, embedding needle heads, grouting and removing a grouting pipe, and water stopping and plugging effects are performed.

Description

technical field [0001] The invention relates to a construction method of high-pressure grouting with a polyurethane plugging agent for overhauling existing railway tunnels, and belongs to the field of railway tunnel construction. Background technique [0002] Due to the long-term freeze-thaw cycle and the corrosion of chemical smoke generated by the internal combustion engine, the lining strength of the existing line tunnel is reduced and structural cracks appear in the tunnel, resulting in a large amount of water leakage in the tunnel, which brings great safety hazards to traffic and affects the entire building structure durability. Conventional treatment methods mainly adopt: (1) Grooving at the cracks, using rigid materials such as "plugging king", "water does not leak", and plugging mortar; (2) Epoxy resin grouting and other methods, the above materials are all rigid The material, the crack width of the wallboard may change over time, and there are certain disadvantages...

Claims

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Application Information

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IPC IPC(8): E21D11/38
CPCE21D11/38
Inventor 王博刘洋董光李志明王振东王强周博张琦郑玉强李大川郭美鑫魏大东张吉涛李禹丰王庭浩谷科举
Owner CHINA RAILWAY NO 9 GRP NO 7 ENG CO LTD
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