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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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 pile is cut by force, it may have a certain degree of deviation in the pile hole, which will affect the bearing capacity of the subsequent pile foundation; at the same time, when the B-type pile is poured, because the A-type pile has already undergone initial setting, the A-type pile and The condensation time between the B-type piles is inconsistent, resulting in cold joints between the A-type piles and B-type piles, and the generation of cold joints will affect the water-stop effect of the wall, and subsequent water seepage problems may occur

Method used

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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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Embodiment 1

[0051] Embodiment 1: refer to figure 1 and 2 , which is a construction method for a full-casing follow-up long auger bored pressure grouting occlusal pile disclosed by the present invention, the steps are as follows:

[0052] S1, positioning and setting out, according to the pile location plan and site reference point, measure and place the pile location on the construction site and drive in obvious marks.

[0053] S2, guide wall construction:

[0054] S2.1, leveling the site: clearing the debris on the surface, and filling the grooves for the migration of the rolled underground pipeline; After the completion, the soil layer in the hole should be compacted, which is conducive to the correct positioning of the steel casing 3;

[0055] S2.2, measuring and placing pile positions: use the total station to carry out on-site stakeout according to the control points of the ground wires, and mark them as the control center line of the guide wall construction.

[0056] S2.3, Excava...

Embodiment 2

[0089] Embodiment 2: refer to image 3 , an auxiliary mechanism for adjusting the position of the steel casing 3 during the construction of the occlusal pile; it includes a frame 5, the vertical projection plane of the frame 5 is L-shaped, and pushers are respectively arranged on both sides of the upper end of the frame 5 7. The two pushers 7 are arranged vertically to each other; refer to Figure 4 and 5 : The pusher 7 includes being installed on the frame 5 (refer to image 3 ) on the mounting seat 71, the mounting seat 71 is provided with a chute 72 along the radial direction of the steel casing 3, and a push rod 73 is inserted in the chute 72, and a displacement block is fixed on one side of the push rod 73 inside the chute 72 74, the displacement block 74 is the fixed isosceles trapezoid setting of the lower bottom and the push rod 73, so that the two sides of the displacement block 74 along the push rod 73 transmission direction are inclined-plane one 78 and inclined-p...

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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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