Long auger rotary-jet mixing steel reinforced cement-soil pile foundation pit water-resisting and supporting method

A technology of cement-soil piles and long spirals, which is applied in excavation, foundation structure engineering, construction, etc., can solve the problems of restriction, mixing of sand layers or sand and pebble layers that cannot be implemented, and can achieve reliable water stop and protection of groundwater resources , the effect of improving reliability

Inactive Publication Date: 2013-04-03
北京建材地质工程有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cement-soil mixing piles are widely used in the fields of foundation pit support, water-stop curtain and foundation treatment because of their simple construction and low cost. Restrictions, especially the mixing sand layer or sand pebble layer is impossible to implement
Cement-soil rotary grouting piles include single-pipe, double-pipe and triple-

Method used

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  • Long auger rotary-jet mixing steel reinforced cement-soil pile foundation pit water-resisting and supporting method
  • Long auger rotary-jet mixing steel reinforced cement-soil pile foundation pit water-resisting and supporting method
  • Long auger rotary-jet mixing steel reinforced cement-soil pile foundation pit water-resisting and supporting method

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Experimental program
Comparison scheme
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Example Embodiment

[0022] Example 1:

[0023] 1. Construction preparation

[0024] 1) Collect data, do a good job in site survey, and carefully write construction organization design;

[0025] 2) Clean up the obstacles on the ground and underground at the construction site, and do a good job of leveling the site, and reasonably arrange the site facilities to ensure normal construction.

[0026] 3) Preparation of raw materials:

[0027] (1) All materials used shall comply with the design, national standards and landmark regulations;

[0028] (2) Cement must have a factory quality certificate. When purchasing, its variety, label, packaging, date of delivery, etc. should be checked and accepted, and stored in accordance with relevant regulations; every 200 tons of cement supplied must be sampled for inspection. Take a small amount of samples from each of the 10 bags for inspection. H-beams must provide a factory quality certificate.

[0029] (3) 15T crawler crane is used for welding of sec...

Example Embodiment

[0059] Example 2:

[0060] 1. Project overview

[0061] The proposed Shunyi District labor training base and e-government center project are located on the north side of the North Second Ring Road in Shunyi District, Beijing, with a foundation buried depth of about 4.15-9.85m.

[0062] 2. Engineering hydrogeological conditions

[0063] The proposed site belongs to the middle and upper part of the alluvial fan of the Chaobai River, the terrain of the site is basically flat, and the ground elevation of the borehole is 27.46-30.06m. The strata within the drilling depth (35.00m) of this survey are divided into artificial accumulation layers and Quaternary sedimentary layers according to genetic type and depositional age. It is described from top to bottom as follows:

[0064] artificial fill layer

[0065] a. Silt fill ①: yellow-brown, slightly wet, slightly dense, with a lot of ash, bricks and other building waste and domestic waste in some parts. The thickness of this ...

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Abstract

The invention relates to a long auger rotary-jet mixing steel reinforced cement-soil pile foundation pit water-resisting and supporting method. An undisturbed soil layer is subjected to rotary-jet mixing on the spot through using the characteristic that a transformed long auger drilling tool with a bit is more adaptive to harder pans, the undisturbed soil layer is stirred and filled with grout at the same time to the designed elevation, the long auger drilling tool is pulled out to finish the construction of the cement-soil piles, and then reinforced materials such as shape steel are inserted into the top ends of the cement-soil piles to form columnar reinforced cement-soil pile bodies with certain strength and anti-permeability performance. The method has the advantages that the pile bodies can be driven in the harder pans to the designed depth and the designed pile diameter; through the occlusion of the pile bodies, the closed continuous pile wall body can be formed, and the reliability of a waterproof curtain is improved; and in order to increase the rigidity and the strength of the pile wall body, cement-soil is mixed and then inserted into the reinforced materials such as the shape steel, so as to ensure water-resistance reliability and the foundation pit safety. The method is applied to wide stratum ranges, and has superior advantages in harder pans in northern areas. The shape steel, an anchor rod or an inner support can be recycled, so that the cost is reduced.

Description

technical field [0001] The invention belongs to foundation pit support method (including subway foundation pit) in building foundation construction, and particularly relates to long helical rotary spraying and stirring cement-soil shaped steel piles and construction technology thereof, which can form pile walls and be used for water-stopping (water-proof or Water interception) curtain and slope protection pile or its parent pile, in the water-rich stratum, the excavation of the foundation pit may not be dewatered. The invention is applicable to a wide range of formations, especially in relatively hard soil formations such as dense sand and pebble formations in northern regions. Background technique [0002] At present, the SMW (cement-soil mixing wall) construction method is widely used in soft soil areas because of its energy-saving, environmental protection and reliable quality. The rate can generally reach 100%. The three-axis mixer equipment has high power, high effici...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D19/18
Inventor 何世鸣李江刘军周与诚梁成华张明中王之军关龙余家兴贾城杨敏陈辉李长生司呈庆王建明程金霞黄鑫峰洪伟张宝河杜高恒
Owner 北京建材地质工程有限公司
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