Method for constructing end wall of subway station in sandy gravel stratum

A technology for subway stations and construction methods, which is applied in underground chambers, earth-moving drilling, wellbore lining, etc., can solve problems affecting shield construction safety, damage to station end wall enclosures and waterproofing membranes, etc., to ensure waterproofing. performance and safety

Active Publication Date: 2020-07-24

ROAD & BRIDGE INT +1

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AI-Extracted Technical Summary

Problems solved by technology

Since the inner side of the end wall is equipped with a waterproof layer, and the construction of the pipe shed requires drilling holes in the end wall, the conventional construction method of the...

Method used

Planting bar should avoid the design and construction position of pipe shed. The inner layer of the end wall and the retaining piles are us...

Abstract

The invention relates to a method for constructing an end wall of a subway station in a sandy gravel stratum. The method comprises the following steps of dividing the end wall into an inner layer andan outer layer, performing casting three times, firstly casting the inner layer of the end wall, providing a stable working surface for shed pipe construction, then casting the outer layer of the endwall, reinforcing the inner layer of the end wall by a pre-casting strip, constructing a pipe shed on the inner layer of the end wall, performing lap jointing of tight waterproof coiled materials, andfinally pouring a post-cast strip of the outer layer of the end wall outside a shed pipe construction area. The waterproof performance of the end wall waterproof coiled material can be guaranteed, and therefore the safety of a foundation pit is guaranteed.

Application Domain

Underground chambersTunnel lining +1

Technology Topic

Geotechnical engineeringStructural engineering +2

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Examples

Experimental program(1)

Example Embodiment

[0022] In the present invention, in order to ensure that the construction of the pipe shed does not damage the airtightness of the waterproof roll layer, the end wall is divided into an inner layer and an outer layer, and the waterproof roll layer is arranged between the inner and outer layers. The outer layer is divided into the first pouring belt and the latter pouring belt, which is convenient for the construction of the pipe shed and the overlapping of the waterproof membrane.

[0023] construction process such as figure 1 As shown, pour the inner layer of the end wall first, lay the waterproof membrane on the inner layer of the end wall, and then pour the outer layer first, leave the construction position of the pipe shed, carry out the construction of the pipe shed, overlap the dense waterproof roll layer, and finally pour the outer wall. After pouring. The specific construction steps are as follows:

[0024] (1) If figure 2 , image 3 As shown, the inner layer 1 of the end wall is poured first, and the inner layer 1 of the end wall and the retaining pile 2 of the end wall are connected by planting reinforcement to form an integral structure.

[0025] The planting bars should avoid the design and construction location of the pipe shed. The inner layer of the end wall and the retaining pile are used as the supporting structure of the side wall of the foundation pit, which can prevent the side wall of the foundation pit from collapsing.

[0026] (2) Lay the waterproof coiled material 3 on the inner surface of the end wall after construction, and reserve the upper and lower lap joints of the waterproof coiled material 3 during laying; delineate the pipe shed construction area on the inner layer of the end wall.

[0027] (3) If Figure 4 , Figure 5 As shown in the figure, the outer layer of the end wall is poured in close contact with the inner layer 1 of the end wall, and the outer layer of the end wall is poured first.

[0028] The inner layer of the end wall and the outer layer of the end wall shall be pre-cast with the same specification of concrete.

[0029] The pre-cast tape on the outer layer of the end wall can be used as a supporting structure for the inner layer of the end wall to prevent the inner layer of the end wall from overturning.

[0030] (4) If Image 6 , Figure 7 As shown, carry out the pipe shed construction, drill holes in the pipe shed construction area and drive into the shed pipe 6;

[0031] (5) After the construction of the shed pipe is completed, the holes of the pipe shed are blocked, and then the upper and lower lap joints of the waterproof membrane 3 are lapped tightly on the inner surface of the end wall;

[0032] (6) If Figure 8 , Figure 9 As shown, after pouring the outer layer of the end wall, the post-pouring belt 7 completely fills the construction area of the tube shed and is firmly connected to the outer layer of the end wall. C40 micro-expanded fine stone concrete is used for the post-casting 7 belts of the outer layer of the end wall.

[0033] The overall thickness of the end wall is set according to the actual protection requirements of the project. In the above embodiment, the thickness of the end wall is 1300 mm in total, the thickness of the inner layer of the end wall is set to 600 mm, and the thickness of the outer layer of the end wall is 700 mm.

PUM

Property	Measurement	Unit
Thickness	600.0	mm
Thickness	700.0	mm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

ensure safety
Guaranteed waterproof performance

Method for constructing end wall of subway station in sandy gravel stratum

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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