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Construction method of sandy ground hole-forming anti-floating anchor of steel pipe and PVC pipe compound bushing

A technology of PVC pipe and composite casing, which is applied in the direction of foundation structure engineering, sheet pile walls, protective devices, etc., which can solve the problems of inability to guarantee the quality of grouting and the construction quality of anti-floating bolts, the difficulty of forming holes, and the difficulty in ensuring anti-floating Anchor design pullout resistance and other issues, to achieve significant social benefits, solve the anchoring force, the effect of simple construction

Inactive Publication Date: 2018-09-28
QINGDAO XINHUAYOU CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex soil quality, when the anchor rods encounter sand, gravel or gravel sand layers and other geological phenomena such as quicksand formed by the pressure difference between the inside and outside of the hole, the collapse of the hole is caused, which makes it more difficult to form the hole and cannot Guarantee the quality of grouting and the construction quality of the anti-floating anchor, so it is difficult to guarantee the design pull-out force of the anti-floating anchor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The steel pipe and PVC pipe composite casing sand geological hole formation anti-floating anchor construction method provided in this embodiment includes the following steps:

[0048] (1) Anchor hole positioning number

[0049] 1 Lay out the anti-floating anchor rod position according to the construction layout plan, and measure the hole position and on-site elevation beforehand, clarify the anchor hole center and anti-floating anchor rod height, and use the total station and level as the measuring instrument; according to the design requirements and the soil Layer conditions, determine the hole position and mark;

[0050] 2 The anchor hole positioning deviation is not more than 20mm, and the verticality deviation is not more than 1.5%;

[0051] (2) Conventional hole drilling machine is in place, steel casing drilling

[0052] 1 Install the anchor hole drilling rig, leveling, adjusting and stabilizing; the working surface should be flat and solid, and the site should ensure the ...

Embodiment 2

[0074] Example 2 Application Example

[0075] (1) Qingdao Taizhou Road No. 15, 17, and 19 Urban Yipin Phase II Project

[0076] 1 Project Overview

[0077] Qingdao Taizhou Road No. 15, 17, and 19 Metropolis Yipin Phase II project is located at No. 15, 17, and 19 Taizhou Road, Shinan District, Qingdao, with a total construction area of ​​72,203.16 square meters. The supporting layer of the foundation of the project is strongly weathered rock, and also contains some lamprophyre. Due to the temporary suspension of excavation to the strongly weathered rock, the surface layer of the strongly weathered rock is weathered and frozen, and all the wind turns into a sand layer with a depth of 0.4m to 1.5 m, due to cost considerations, the method of digging down to the rock layer is not used in the non-holding position, so most of the sand layer is retained, but it is difficult to construct the anti-floating anchor on the sand layer in the conventional way.

[0078] 2 Construction situation

[00...

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Abstract

The invention discloses a construction method of a sandy ground hole-forming anti-floating anchor of a steel pipe and PVC pipe compound bushing. The method comprises the following steps: (I) positioning and numbering anchor holes; (II) taking a conventional hole drill in position and drilling a steel sleeve; (III) blowing and cleaning holes at a high pressure and lifting a drill; (IV) putting a PVC bushing down and pulling out the steel bushing; (V) grouting; and (VI) putting the anti-floating anchor down. The process method solves the hole collapsing problem by drilling the steel bushing to form holes and blowing and cleaning the holes, so that the anti-floating anchor is smoothly hole-formed. According to the process method, a protective wall is formed by means of the PVC bushing, so that the hole collapsing problem in the grouting construction process is solved, and meanwhile, the anti-floating anchor plays a role of corrosion resistance. The process method is simple to operate andsimple to construct, and can form holes within a relatively short time and construct the anti-floating anchor. The process method can solve the problem of an anchoring force of the anti-floating anchor in a soil layer effectively; and holes are formed by means of a conventional hole drill through the process method, and the steel bushing is repeatedly used, so that the extra cost is prevented frombeing increased.

Description

Technical field [0001] The invention relates to a construction method of a geological hole-forming anti-floating anchor rod for steel pipe and PVC pipe composite casing sand, and belongs to the technical field of building construction. Background technique [0002] During the construction process, the geological conditions in some areas are mostly the upper mixed fill layer, silt layer, silty clay layer, medium-coarse sand layer, gravel sand layer, etc., while the lower part is stable weathered rock. At the same time, due to the groundwater level in some areas High, in addition to setting pile foundations to increase foundation stability, building structures usually have anti-floating anchors to solve the problem of building anti-floating. Due to the complex soil quality, when the anchor rod is formed into a hole, it encounters sand, gravel or gravel sand layers and other geological phenomena such as quicksand formed by the water pressure difference between the inside and outside...

Claims

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Application Information

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IPC IPC(8): E02D5/76E02D31/12
CPCE02D5/76E02D31/12
Inventor 高原
Owner QINGDAO XINHUAYOU CONSTR GROUP
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