Construction method of full-casing follow-up long spiral drilling press-grouting secant pile

A technology of long helical drilling and construction method, which is applied in the direction of sheet pile walls, foundation structure engineering, construction, etc. It can solve the problems of increasing the difficulty of cutting steel casings, affecting the water-stop effect of walls, and inconsistent setting time, etc., to achieve Reduce the chance of water seepage, improve drilling efficiency, and enhance the effect of water sealing

Active Publication Date: 2020-08-11
江西中恒地下空间科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing technical solutions have the following defects: in the construction process, it is necessary to wait for the initial setting of the A-type piles for 7-9 hours, and then drill holes between adjacent A-type piles. The two A-type piles are cut off by the casing, and the A-type pile itself is in the initial setting state, and its strength is relatively high. On the one hand, it increases the difficulty of cutting the steel casing and reduces its drilling efficiency; on the other hand, the A-type pile When the

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  • Construction method of full-casing follow-up long spiral drilling press-grouting secant pile
  • Construction method of full-casing follow-up long spiral drilling press-grouting secant pile
  • Construction method of full-casing follow-up long spiral drilling press-grouting secant pile

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Example Embodiment

[0051] Example 1: Reference figure 1 with 2 , Is a construction method of a full-protection barrel follow-up long spiral bored pressure-grouting occlusal pile disclosed by the present invention, the steps are as follows:

[0052] S1. Position and set the line. According to the plan of the pile position and the site reference point, measure the pile position on the construction site and drive the obvious mark.

[0053] S2, guide wall construction:

[0054] S2.1. Leveling the site: clearing the surface debris and filling the trenches where the rolling underground pipeline migrates; in this implementation, if you encounter a miscellaneous fill layer that affects the formation of holes, the method of replacing the plain soil should be adopted, and the guide wall should be made After completion, the soil layer in the hole should be compacted, which is conducive to the correct placement of the steel protective cylinder 3;

[0055] S2.2. Pile position measurement: Use a total station to stak...

Example Embodiment

[0089] Example 2: Reference image 3 , An auxiliary mechanism for adjusting the position of the steel casing 3 in the construction of the occluding pile; it includes a frame 5, the vertical projection plane of the frame 5 is L-shaped, and two sides of the upper end of the frame 5 are provided with pushers 7. The two pushing pieces 7 are arranged perpendicular to each other; refer to Figure 4 with 5 :The pusher 7 includes the installation on the rack 5 (refer to image 3 ) On the mounting seat 71, the mounting seat 71 is provided with a sliding groove 72 along the radial direction of the steel casing 3, a pushing rod 73 is inserted into the sliding groove 72, and a displacement block is fixed on the side of the pushing rod 73 in the inner part of the sliding groove 72 74. The displacement block 74 is arranged in an isosceles trapezoid with the lower bottom fixed to the push rod 73, so that the two sides of the displacement block 74 along the driving direction of the push rod 73 a...

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Abstract

The invention relates to a construction method of a full-casing follow-up long spiral drilling press-grouting secant pile. The construction method comprises the following steps of S1, positioning andpaying off; S2, guide wall construction; S3, drilling; S3.1, a drilling machine is in place; S3.2, starting the drilling machine; S4, pressing and grouting concrete; and S5, mounting a reinforcement cage; the forming sequence of pile holes is A1-B1-A2-B2-A3-B3-A4-B4... An-Bn; after the A1 concrete is subjected to press-grouting, the B1 pile hole is excavated immediately; when A2 pile hole concretepress-grouting is completed, reinforcement cage installation is conducted on the B1 pile hole; and when A3 concrete pressure grouting is completed, reinforcement cage installation is conducted on B2pile holes, and reinforcement cage installation of the B-shaped piles is sequentially conducted. The construction method has the effects that construction is convenient, meanwhile, stable connection between the A-type piles and the B-type piles is enhanced, cold joints are reduced, the wall water stop effect is improved, and the water seepage probability is reduced.

Description

technical field [0001] The invention relates to the technical field of building foundation construction, in particular to a construction method of a full-casing follow-up long helical drilling pressure grouting occlusal pile. Background technique [0002] At present, the commonly used foundation pit support soil retaining and water-stop structures include bored piles + water-stop curtains, underground diaphragm walls, SMW construction methods, and drilled occlusal piles. The occlusal pile is generally composed of reinforced concrete piles and plain concrete piles occluded to form a complete wall, which also has the functions of retaining soil and water. At present, the underground diaphragm wall is mainly used as a temporary support during construction. After being filled back, it will withdraw from the stage. In the later stage of building structure use, the role of the underground diaphragm wall will no longer be considered, resulting in a certain waste. However, the under...

Claims

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Application Information

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IPC IPC(8): E02D5/34E02D5/38
CPCE02D5/34E02D5/38
Inventor 曹开伟徐升才罗成名冯上涛黄辉姚时
Owner 江西中恒地下空间科技有限公司
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