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Ground strengthening cement mortar rotary-spraying pile and construction method

A technology for cement mortar and foundation reinforcement, which is applied in foundation structure engineering, sheet pile walls, buildings, etc., can solve problems such as low pile strength, and achieve the effects of improving pile quality, reducing plasticity index, and increasing content.

Inactive Publication Date: 2008-09-03
徐玉杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the grout used for foundation reinforcement is generally pure cement slurry, but after many years of practice, the jet grouted piles using this pure cement slurry have low pile strength in clay strata

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Tianjin Jigang Railway Adding Second Line Project, the stratum is silty clay, slag cement pure cement slurry with cement content of 40% is used for rotary grouting pile construction, the pile length is 18m, and it has been tested by core pulling 28 days after the pile is completed, and there is no side limit The average value of the compressive strength is 4.0MPa, and the slag cement with a cement content of 40% is used, and the mass ratio of each component is: cement 100, water 70, sand 50 (particle size 0.15mm) cement mortar rotary spraying pile 28 days after the pile was built, the average value of the unconfined compressive strength was 5.4MPa, and the strength increased by more than 30%.

Embodiment 2

[0033] Tianjin Jigang Railway Adding Second Line Project, the stratum is silty clay, slag cement pure cement slurry with cement content of 40% is used for rotary grouting pile construction, the pile length is 18m, and it has been tested by core pulling 28 days after the pile is completed, and there is no side limit The average value of the compressive strength is 4.0MPa, and the slag cement with a cement content of 40% is used, and the mass ratio of each component is: cement 100, water 100, sand 20 (particle size 0.15mm) cement mortar rotary spraying pile 28 days after the pile was built, the average value of the unconfined compressive strength was 5.0MPa, and the strength increased by more than 30%.

Embodiment 3

[0035] Tianjin Jigang Railway Adding Second Line Project, the stratum is silty clay, slag cement pure cement slurry with cement content of 40% is used for rotary grouting pile construction, the pile length is 18m, and it has been tested by core pulling 28 days after the pile is completed, and there is no side limit The average value of the compressive strength is 4.0MPa, and the slag cement with a cement content of 30% is used, and the mass ratio of each component is: cement 100, water 150, sand 100 (particle size 0.10mm) cement mortar jet spraying pile 28 days after the pile was built, the average value of the unconfined compressive strength was 4.2MPa, saving more than 20% of cement.

[0036] The above-mentioned embodiment takes the rotary spraying pile as an example. Of course, one or a combination of fixed spraying or pendulum spraying is used. The principle is the same, and no more examples will be described.

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Abstract

The present invention discloses a foundation reinforced cement mortar rotary-spraying pile and the construction method thereof. The conventional rotary-spraying pile uses the slurry as the neat cement grout and the cement is added with fine powder sand. The slurry has obvious effect for improving the character of the clay foundation and increasing the pile forming quality of the rotary-spraying pile. The phenomenon of low pile-forming strength of conventional rotary-spraying pile in the clay formation is overcome. The same formation adopts a cement mortar rotary-spraying pile. The strength of the cement-treated soil after pile forming is increased for about 30% compared with the conventional neat cement group rotary-spraying pile and the cement is saved for more than 20%.

Description

technical field [0001] The invention relates to a rotary grouting pile and a construction method, in particular to a foundation-reinforced cement mortar rotary grouting pile and a construction method. Background technique [0002] In the prior art, the grout used for the jet grouted piles in foundation reinforcement is generally pure cement slurry, but after many years of practice, the jet grouted piles using this kind of pure cement slurry have low pile strength in clay strata. Studies have shown that one of the factors affecting the pile strength of the jet grouted pile is the nature of the foundation soil. Practice has proved that the I of the foundation soil p The larger the value, the higher the clay content, the lower the strength of the cement-soil after pile formation. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a ground-reinforced cement mortar jet grouting pile and a construction method which can c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/46C04B28/00C04B14/06
Inventor 徐玉杰任作伟
Owner 徐玉杰
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