A kind of construction method of cement-soil and concrete composite material pile

A technology of combining materials and construction methods, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of complex stratum conditions of cast-in-place piles, necking and broken piles, and shallow pile damage, etc. Construction period, improve integrity, and reduce environmental pollution

Inactive Publication Date: 2016-05-18
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems in the prior art: (1) the strength of the pile body of the jet-grouting pile is low, and the problem that it is easy to be damaged in the shallow part of the pile body after being loaded; Weak soil layer or sandy gravel layer, it is difficult to form holes, and the holes are easy to collapse during the construction process, resulting in quality problems such as necking of the pile body and broken piles; There is no need to use mud wall protection, thus solving the problem of pollution to the environment during the construction process

Method used

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  • A kind of construction method of cement-soil and concrete composite material pile
  • A kind of construction method of cement-soil and concrete composite material pile
  • A kind of construction method of cement-soil and concrete composite material pile

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Embodiment 1

[0048] A residential building is 45.1m long and 17.7m wide, with 7 floors above the ground, brick-concrete structure, reinforced concrete raft foundation, and the buried depth of the foundation is -2.5m. The foundation treatment adopts the cement-soil and concrete composite material piles of the present invention, the designed pile diameter is 700mm, the pile distance is 1.7m, arranged in a square, and the design length of a single pile is 6.5m. After the cement-soil and concrete composite pile construction is completed, a 500mm thick natural graded sandstone cushion is laid on it. The characteristic value R of the single pile bearing capacity is required by the design k = 300kN.

[0049] According to the site engineering survey report, the stratum structure is as follows: ① plain fill (Q 4 ml+pd ): Brown-yellow, very wet, plastic, mainly silty clay. Layer thickness 0.90 ~ 1.5m. ② gravel sand layer (Q 4 al ): gray, very wet ~ saturated, loose. The thickness of the laye...

Embodiment 2

[0061] The site of a residential building to be built in a residential area, the landform unit belongs to the Weihe River I terrace, and the stratum from top to bottom is as follows: 0-5.5m is loess-like soil, 5.5-9.3m is silt soil, 9.3-12.0m is pebble layer , The foundation soil of the site is non-collapsible loess. The foundation treatment of the proposed residential building adopts the rotary grouting pile, the designed pile length of the rotary grouting pile is 12.0m, and the pile diameter is 600mm. Before the construction of engineering piles, a single pile test of 3 jet grouting piles was carried out in the site, and the test pile numbers are D 1 、D 2 and D 3 , the measured pile diameters are 670mm, 480mm and 600mm respectively, and the pile lengths are all 12.0m. The tests were all loaded until the piles were destroyed, and the measured ultimate loads were 720kN, 450kN and 400kN respectively. The load-settlement (Q~s) curves are shown in Figure 4 .

[0062] After ...

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Abstract

The invention discloses a cemented soil and concrete composite pile and a construction method thereof. The construction method comprises the following steps: S1, performing setting out positioning according to a designed pile layout; S2, drilling; S3, inserting a spray pipe into a hole to the predetermined depth of the stratum; S4, performing jet grouting; S5, pulling out the pipe and washing to finish jet grouting pile construction; S6, performing cast-in-place concrete pile pore forming on the soil body above the top part of each jet grouting pile after the jet grouting pile construction is finished for 3-5 days; S7, digging the top part of each jet grouting pile to form a mortise; S8, filling plain concrete to the designed elevation of the top of each pile, vibrating and compacting to finish cemented soil and concrete composite pile construction. The composite pile body disclosed by the invention has the advantages that the connection is reliable, the integrality is strong, the vertical bearing capacity and the horizontal shearing resistance are higher, the pile body is not easy to damage under pressure, the adaptability to the stratum is strong, meanwhile, the construction is easy, the environmental pollution is small, the cost is low, and the like.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment in civil engineering, and in particular relates to a cement soil and concrete composite material pile and a construction method thereof. Background technique [0002] At present, jet grouting piles and concrete pouring piles are widely used in various foundation treatments and foundation projects. The rotary grouting pile cuts and crushes the soil into loose particles through the high-pressure jet stream, mixes it with the cement slurry, and forms a cylindrical consolidated body with a certain strength after solidification, which plays the role of strengthening the soil and has the ability to be affected by the soil conditions of the stratum. Small impact, suitable for piles and other advantages. However, since the material of the jet grouted pile body is a mixture of cement and foundation soil, the strength of the pile body is low. The bearing capacity is reduced; while the strengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/46E02D5/38
Inventor 王建平范力姚修文樊胜军孙淮刘佳伟
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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