Construction method for deep foundation pit of elevator shaft

Abstract

The invention provides a construction method for a deep foundation pit of an elevator shaft. The construction method comprises the following steps that construction of an auxiliary precipitation pit is firstly conducted; the depth of the auxiliary precipitation pit is 1-2 m larger than that of the deepest position of the deep foundation pit of the elevator shaft, and water drawing is conducted; then construction of the deep foundation pit of the elevator shaft is conducted, the deep foundation pit is made into a funnel-shaped water collection pit with the diameter of the bottom smaller than that of the top, and then water drawing is conducted; construction is conducted according to a drawing of the deep foundation pit of the elevator shaft, and water stop steel plates with the thickness of 3-5 mm are laid; construction is conducted on a waterproof layer of the surface of the elevator shaft; and finally concrete pouring is conducted. According to the construction method, construction is easy, the water level of a construction area of the elevator shaft can be lowered below the lowest point of the elevator shaft, it is guaranteed that no water is accumulated in the elevator shaft, then construction of the next procedure is conducted, and therefore water seepage risks are reduced, construction quality is improved, the construction period is shortened, and the aim of lowering cost is achieved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method for a deep foundation pit of an elevator shaft. Background technique [0002] During the foundation construction of the building, due to the backwater of the groundwater, there is often too much water in the elevator shaft, which makes it impossible to carry out the construction of the concrete cushion and the waterproof membrane laying process in the elevator shaft. The height of groundwater ponding is reduced below the construction height. [0003] At present, the precipitation on the construction site uses the precipitation at the well point of the foundation pit. This method can control the water level inside the foundation pit. However, this method has the following defects: the elevation of the bottom of the elevator shaft is at the lower part of the foundation pit. The construction will cause great difficulties. If the water is drained...

AI Technical Summary

Problems solved by technology

However, this method has the following defects: the elevation of the bottom of the elevator shaft is at the lower part of the foundation pit. The construction will cause great difficulties. If the water is drained and the cushion and waterproof membrane are forcibly constructed, the waterproof membrane will be bulged out of the surface of the bottom plate by the water and the waterproof protective layer will be cracked

Therefore, it will cause certain difficulties to the construction of the next process.

[0004] In the construction of elevator shafts or water collection wells when the groundwater level is high, the conventional membrane waterproofing process cannot effectively curb the accumulation and infiltration of soil water around the brick tire membrane even with continuous precipitation, resulting in damage to the waterproof membrane; formwork installation Hanging formwork or integral cylinder formwork with bottom sealing is often used, which cannot completely solve the problem of "floating" of deep well formwork during the pouring process; deep well concrete pouring cannot be completed at one time, and construction cold joints are easy to form, and anti-leakage treatment is difficult; concrete Poor pumping and drainage of accumulated water during pouring affects the molding quality of waterproof concrete

[0005] At the same time, the traditional elevator shaft construction technology generally adopts the method of lowering the water level in the basement to below the bottom of the elevator shaft before proceeding to the next step of construction. In the water, there are many common quality problems such as honeycomb pockmarks around the bottom plate

Moreover, the entire precipitation process has a long cycle, low efficiency, high construction period and precipitation costs, and it is difficult to meet the strict requirements of the fast pace and construction period on site.

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