An underground layered drainage structure and its construction method

Abstract

The invention relates to an underground layered drainage structure, wherein the non-cavity drainage ditch communicates with the tubular drainage ditch, and a porous concrete layer is arranged on the upper part of the non-cavity drainage ditch. FRP plastic porous pipes are set in the tubular drainage ditch and filled with gravel. The upper part of the tubular drainage ditch and along the outer side of the protective brick wall are successively provided with a sandy reverse filter layer and a sandy soil protection layer. The non-cavity drainage ditch is also filled with gravel. The groundwater in the non-cavity drainage ditch flows into the water collection inspection well through the tubular drainage ditch, and is discharged in a concentrated manner. The invention can effectively control the height of the underground water level, avoid the water seepage of the underground structure caused by the failure of the waterproof coiled material under the long-term action of the groundwater, reduce the pressure of the groundwater on the foundation of the lower part of the factory building, and reduce the possibility of the foundation floating up. In addition, the drainage structure of the present invention is not only suitable for coastal projects, it is also suitable for the organization and drainage of ground water seepage, and can be widely used in underground drainage projects for industrial and civil buildings with high groundwater levels, as well as for "sponge cities" to realize rainwater. Recycling.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and relates to an underground layered drainage structure and a construction method thereof. Background technique [0002] A project is located by the sea and on the bedrock after blasting. The groundwater in this area is Quaternary pore phreatic water and bedrock fissure water. The Quaternary pore water mainly occurs in gravel filling, and the bedrock fissure water is mainly weathered fissure water, which occurs in the rock-bearing monzonite and is distributed in veins and branches. The buried depth of the groundwater level is 3.7-6.43m, and the elevation is 1.33-3.89m. The groundwater level is relatively high and the groundwater pressure is high. According to the usual practice, due to the hydraulic pressure of the groundwater, it is necessary to ensure that the underground concrete raft foundation of the building is thick and large. In addition, the waterproof membrane cannot ...

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Problems solved by technology

[0003] Aiming at the problem that groundwater damages the foundation pressure of buildings or structures, the present invention proposes an underground layered drainage structure

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