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A kind of construction method of deep foundation pit

A construction method and technology for deep foundation pits, which are applied in basic structure engineering, excavation, construction, etc., can solve problems such as easy deformation, decrease in strength of steel sheet piles, and increase in reverse transportation costs, so as to avoid mutual influence, fast construction, and construction. low cost effect

Active Publication Date: 2020-03-24
GUANGZHOU ENG CO LTD OF CHINA RAILWAY 19TH BUREAU GRP
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Problems solved by technology

Steel sheet piles are generally suitable for foundation pits with an excavation depth of no more than 7 meters. For deep foundation pits with a depth of more than 10 meters, the existing steel sheet piles cannot meet the requirements.
The existing method generally satisfies the length requirement of the deep foundation pit by connecting two steel sheet piles, but the disadvantages of the method of connecting two steel sheet piles are: large waste of materials, increased cost of on-site transportation, and the connection of steel sheet piles Decreased strength, prone to deformation, greatly increasing the construction cost of deep foundation pits

Method used

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  • A kind of construction method of deep foundation pit
  • A kind of construction method of deep foundation pit
  • A kind of construction method of deep foundation pit

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Embodiment Construction

[0019] In the embodiment of the present invention, the depth of the deep foundation pit of the main pier reaches 10.5m, and the length is 42m. If the most commonly used 12m-long Larsen IV-type steel sheet pile is used as the enclosure wall, the traditional method cannot realize the soil retaining Due to the effect of water, the method of excavating at intervals and pouring the back cover of the present invention effectively solves the problem of insufficient length of the steel sheet piles, greatly improves the construction speed and reduces the cost.

[0020] see figure 1 , figure 1 It is a structural schematic diagram of a deep foundation pit embodiment of the present invention. In this embodiment, the depth H1 of the deep foundation pit 1 is 10.5m, the length H2 of the steel sheet pile 2 is 12m, and the bottom of the deep foundation pit 1 is provided with a concrete sealing layer 10, and the main pier is constructed on the surface of the concrete sealing layer 10. Before ...

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Abstract

The invention provides a deep foundation pit construction method. The deep foundation pit construction method comprises the following steps that a base bottom of a deep foundation pit is divided intoa plurality of first zones and a plurality of second zones, the first zones and the second zones are arranged at intervals, the width of the first zones is three times that of the second zones, each first zone is divided into a third zone, a fourth zone and a fifth zone which are equal in width, and each fourth zone is located between the corresponding third zone and the corresponding fifth zone;earth cutting operation is carried out on the second zones, and concreting is carried out in the second zones obtained after excavation for first-time bottom sealing; earth cutting operation is carried out on the fourth zones, and concreting is carried out in the fourth zones obtained after excavation for second-time bottom sealing; and earth cutting operation is carried out on the third zones andthe fifth zones, and concreting is carried out in the third zones and the fifth zones obtained after excavation for third-time bottom sealing. By means of the construction method, the problem that the length of a steel sheet pile is insufficient is effectively solved, the construction speed is high, and the construction cost is low.

Description

technical field [0001] The invention relates to the technical field of underground engineering construction, in particular to a construction method for deep foundation pits. Background technique [0002] Steel sheet pile is a kind of hot-rolled (or cold-formed) section steel with lock or jaw. The jaws are connected and occluded to form a continuous steel sheet pile enclosure wall, which is used to retain soil and water. It has the advantages of light weight, high strength, quick construction, and recyclability. It is used in buildings, bridges, municipalities, ports, and railways at home and abroad. And other fields have a long history of use. Steel sheet piles are generally suitable for foundation pits whose excavation depth is not greater than 7 meters. For deep foundation pits with a depth of more than 10 meters, the existing steel sheet piles cannot meet the requirements. The existing method generally satisfies the length requirement of the deep foundation pit by conne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/02E02D17/04
CPCE02D17/02E02D17/04E02D2300/002E02D2300/0029
Inventor 戴德军程喜
Owner GUANGZHOU ENG CO LTD OF CHINA RAILWAY 19TH BUREAU GRP
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