Construction method of raft foundation

A raft foundation and construction method technology, which is applied in basic structure engineering, soil protection, construction, etc., can solve the problems of different settlement and stress distributions of raft foundations, reduce electroosmosis costs, improve structural performance, reduce The effect of differential settlement

Inactive Publication Date: 2011-07-20
ANHUI TONGJI CONSTR GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a construction method for the raft foundation, which solves the problem of different settlement distribution and stress distribution of the raft foundation

Method used

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  • Construction method of raft foundation
  • Construction method of raft foundation

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Embodiment Construction

[0013] Describe in detail below in conjunction with accompanying drawing.

[0014] A building is a nine-story frame structure with a building area of ​​3240m 2 , using a frame structure, the raft thickness of the project is 60cm, and the pile foundation adopts bored piles.

[0015] In this embodiment, a cushion layer is arranged under the raft foundation, and the cushion layer is made of sand and gravel mixture with a thickness of 35 cm. The lower part of the cushion layer is rigid piles and foundation soil, and a 10 cm polystyrene board is arranged between the rigid piles and the cushion layer. , the surrounding beams are made around the cushion layer. The height of the surrounding beams is 35cm and the width is 30cm. The distance between the edge of the plate is 30cm, the distance between the four rows of electroosmotic wells at the edge is 2.5m, and the distance between the middle electroosmotic wells is 3m. A drainage ditch is arranged around the raft, and the drainage d...

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Abstract

The invention discloses a construction method of a raft foundation. The invention is characterized in that a mattress layer is arranged under the raft foundation and adopts sandstone mixture. The thickness of the mattress layer is 30 to 40 cm and the lower part thereof is rigid pile and foundation earth. A 10cm polyphenyl board is arranged between the rigid pile and the foundation earth. A grid is made at the periphery of the mattress layer, the height thereof is the same as the height of the mattress layer and the width thereof is 25 to 30cm. The strength of the grid concrete is the same as the strength of the raft foundation. Electric seepage wells are arranged under the mattress layer and the depth thereof is 9 to 12cm. The distance between the outmost electric seepage well and the edge of a raft plate is 30cm. The space of the marginal 4 lines of electric seepage wells is 2.5 to 3m. The space of the middle electric seepage wells is 3 to 4m. Drainage ditches are arranged around theraft plate, 15 to 20cm under the mattress layer. The width of the drainage ditches is 20 to 25cm. The invention has low cost and can effectively improve structural performance.

Description

technical field [0001] The invention relates to the construction field, in particular to a construction method of a raft foundation. Background technique [0002] Since the stress distribution under the raft is characterized by large surrounding areas and small central areas, the settlement distribution is just the opposite. The characteristics of the settlement distribution are small surrounding areas and large central areas. If the stress characteristics are taken into consideration, the optimized design should use more piles around the perimeter and smaller piles in the middle. If the settlement characteristics are taken into consideration, the optimized design should adopt small piles arranged around and more piles arranged in the middle. Obviously there is a contradiction between the two, so the traditional foundation scheme uses a large number of piles to solve the contradiction. Contents of the invention [0003] The technical problem to be solved by the present i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D27/00E02D3/11
Inventor 朱奎
Owner ANHUI TONGJI CONSTR GRP
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