Treatment method of foundation pit dewatering well piercing basement concrete floor to block and stop water

Abstract

The invention discloses a treatment method of plugging water stop construction for a foundation pit dewatering well to penetrate through a concrete base plate of a basement. The treatment method comprises the following steps of producing a water stop steel sleeve pipe; casting bedding concrete of a basement base plate; cutting a dewatering well strainer on a cushion surface; winding the lower end of the water stop steel sleeve pipe with bituminous hemp fibers, then inserting into the dewatering well trainer, filling seams with cement mortar and sealing; constructing a waterproof layer on the cushion surface of the basement base plate; banding reinforcing steel bars on the concrete base plate, and continuously dewatering; casting basement base plate concrete, and continuously dewatering; ending dewatering for the dewatering well one by one; and plugging the dewatering well. According to the treatment method disclosed by the invention, the double-wing-ring water stop steel sleeve pipe is adopted and is inserted into a dewatering well mouth; a plugging structure of the well mouth has the advantages of simplicity, scientificity, reasonability, safety, reliability and good water stop effect, and can well adopt to dewatering requirements of the basement base plate construction under different working conditions; and the dewatering demand of the basement reinforced concrete base plate in the construction process is met, and the problem of water stop plugging of the dewatering well penetrating through the basement reinforced concrete base plate when the dewatering is ended is well solved.

Description

technical field [0001] The invention relates to the field of deep foundation pit foundation construction, in particular to a construction treatment method for foundation pit dewatering wells piercing concrete bottom plates to block and stop water. Background technique [0002] With the rapid development of my country's economic construction, various public buildings and high-rise residential buildings are increasing, and the plane size of the deep foundation pit is getting larger and larger. At present, the construction method of deep well dewatering in the pit is basically used for deep foundation pit dewatering. The plugging construction technology of the foundation pit dewatering well is a key point in the entire foundation construction. It directly affects the water-stop effect of the foundation pit dewatering well and the waterproof quality of the foundation floor concrete, thereby affecting the construction of the basement foundation. The precipitation during the const...

AI Technical Summary

Problems solved by technology

The plugging construction technology of the foundation pit dewatering well is a key point in the entire foundation construction. It directly affects the water-stop effect of the foundation pit dewatering well and the waterproof quality of the foundation floor concrete, thereby affecting the construction of the basement foundation. The precipitation during the construction of the basement concrete floor and the plugging of the wellhead after the precipitation have brought new difficulties and challenges

[0003] The comparative document 1 with the publication number CN104711994A discloses a construction method for dewatering and plugging deep wells in foundation pits. The wellhead sealing steel plate and galvanized steel pipe are used to connect the suction pump to absorb water; The problem of plugging, but the problem of the combination of valves, water-absorbing steel pipes and foundation floor concrete is not solved, and the water stop valve is wrapped in the backfill layer. After a long time, there is a risk of water seepage at the wellhead due to corrosion of pipe fittings

The comparative document 2 with the publication number CN101148884B discloses a construction method for waterproofing and sealing of dewatering wells in foundation pits, using steel casings, flanges, connecting bolts, and rubber rings to seal the wellhead to solve the problem of waterproofing and sealing of dewatering , but did not solve the connection problem between the steel casing and the dewatering wellhead, and did not further solve the problem of the connection between the dewatering well, steel casing, and foundation floor, so it is difficult to meet the water-stop and waterproof requirements of the wellhead

The comparative document 3 with the publication number CN204059380U discloses a deep well dewatering wellhead sealing device and method in the foundation pit of an underground garage. A steel tube with an inner and outer water stop ring is used to cover the wellhead, and a steel plate is used to seal the upper opening of the steel sleeve to achieve The purpose of sealing the dewatering wellhead is to solve the problem of sealing the dewatering wellhead of the deep well in the foundation pit, but there are many water-stopping links, many procedures, complex construction and the need to install an annular steel plate waterstop on the raft foundation, and the steel sleeve and the wellhead have not been explained. How to deal with the gap between the outer walls, there is a hidden danger of water seepage

The comparative document 4 whose publication number is CN103556644A discloses a wellhead plugging casing of a basement floor dewatering well and a construction method. A steel cylinder with a flange is used to place it on the wellhead, and the steel cylinder is first fixed with concrete, and then Cover the flange to seal the water, which solves the problem of blocking the wellhead of the dewatering well, but it is necessary to over-excavate the working pit with the height of the steel cylinder, and first pour concrete to fix the steel cylinder, which increases the amount of basic engineering, and the water-stop steel cylinder and the tube well Not tightly bound

[0004] At present, the water-stop sealing method commonly used in dewatering wells is as described in the above-mentioned retrieved patents, that is, a pumping steel pipe is placed in the dewatering well that penetrates the concrete floor, and a flange and a gate valve are installed at the wellhead (generally at the lower part of the floor). When it is blocked, close the gate valve, cut off the pumping steel pipe at the upper end of the gate valve, and use the floor concrete to wrap and seal it. This method not only requires a large number of standard pipe materials, but also requires a professional plumber to construct. Thickening, changing the structure of the bottom plate, and additionally increasing the construction cost

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