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PHA (preliminary hazard analysis) anchor rod and construction method thereof

A construction method and bolt technology, which are applied in the directions of bolt installation, earthwork drilling, infrastructure engineering, etc., can solve the problems of long construction period, surrounding houses, road cracking, soil disturbance, etc., and achieve convenient construction and good effect. , the effect of reducing disturbance

Active Publication Date: 2014-07-09
周同和
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] 2) The secondary splitting grouting process will cause great disturbance to the soil. When applied in the foundation pit project, it will cause the soil around the foundation pit to settle, and even cause the surrounding houses and roads to crack
[0016] 3) Secondary grouting can be carried out only after the initial setting of primary grouting, and stretching and locking can be carried out only after the strength of grouting body reaches the design requirements, and the construction period is longer

Method used

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  • PHA (preliminary hazard analysis) anchor rod and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A PHA bolt, such as figure 1 As shown, the anchor rod body 4 is included, and the anchor rod body 4 is covered with a prefabricated tubular outer anchoring body 1 . The prefabricated tubular outer anchor 1 has a wall thickness of 25mm and an outer diameter of 150mm, and is formed by connecting multiple sections, each section is 1.5m long, and the adjacent sections are joined and fixed by connecting sleeves 3 .

[0037] Its construction method includes the following steps:

[0038] (1) Hole forming: use the built-in auger drill pipe to take soil and drill to form the pilot hole;

[0039] (2) Jack the prefabricated tubular outer anchor 1, and then continue to jack the steel casing at the outer end of the prefabricated tubular outer anchor 1;

[0040] (3) Implant the anchor body 4 in the prefabricated tubular outer anchor 1, pour high-grade cement slurry or cement mortar 2, and pull out the steel casing after the pouring is completed;

[0041] (4) pulp replenishment;

...

Embodiment 2

[0045] A PHA bolt, such as figure 1 As shown, the anchor body 4 is included, and the anchor body 1 is covered with a prefabricated tubular outer anchor 1 . The prefabricated tubular outer anchor 1 has a wall thickness of 40mm and an outer diameter of 180mm, and is formed by connecting multiple sections, each section is 1.5m long, and the adjacent sections are joined and fixed by connecting sleeves 3 .

[0046] Its construction method includes the following steps:

[0047] (1) Hole forming: use the auger drill pipe to drill the hole while injecting the cement slurry retaining wall, and inject the low-grade cement slurry while pulling out the drill pipe;

[0048] (2) Jack the prefabricated tubular outer anchor 1, and then continue to jack the steel casing at the outer end of the prefabricated tubular outer anchor 1;

[0049] (3) Implant the anchor body 4 in the prefabricated tubular outer anchor 1, pour high-grade cement slurry or cement mortar 2, and pull out the steel casing...

Embodiment 3

[0054] A PHA bolt, such as figure 1 As shown, the anchor rod body 4 is included, and the anchor rod body 4 is covered with a prefabricated tubular outer anchoring body 1 . The prefabricated tubular outer anchor 1 has a wall thickness of 30mm and an outer diameter of 160mm, and is formed by connecting multiple sections, each section is 1.5m long, and the adjacent sections are joined and fixed by connecting sleeves 3 .

[0055] Its construction method includes the following steps:

[0056] (1) Hole forming: Umbrella drilling tools are used to drill holes, and water is injected to replace the soil while drilling;

[0057] (2) While the drilling rig is drilling, the prefabricated tubular outer anchor 1 and the steel casing are sequentially jacked up. When the prefabricated tubular outer anchor 1 reaches the predetermined position, the drill pipe is pulled out and low-grade cement slurry is poured. It can be carried out when the end needs to be enlarged. Rotary jet reaming;

[0...

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Abstract

The invention discloses a PHA (preliminary hazard analysis) anchor rod and a construction method thereof and belongs to the technical field of support. The PHA anchor rod comprises an anchor rod body which is sleeved with a precast tubular outer-anchoring element. The construction method includes the steps of 1), forming a hole; 2), jacking the precast tubular outer-anchoring element and continuously jacking a steel sleeve on the outer end of the precast tubular outer-anchoring element; 3), inserting the anchor rod body into the precast tubular outer-anchoring element, potting high-grade cement slurry or cement mortar, and pulling out the steel sleeve after completing potting; 4), supplementing the slurry; 5), tensioning and locking. The outer-anchoring element is taken as a precast part, on-site working hours can be shortened, the outer-anchoring element is higher in strength as compared with a cast-in-place anchoring element, and cracking and destroying are less easily to occur; the anchor rod body inserted does not need to be taken out, so that construction is facilitated with good effect; the precast outer-anchoring element is tightly combined with soil in the hole, the slurry can be prevented from forming gaps with the soil after shrinking; all grouting takes place inside the outer-anchoring element, secondary splitting grouting technology is not adopted, and disturbance upon the soil is reduced.

Description

technical field [0001] The invention belongs to the technical field of support, and in particular relates to a PHA anchor (prefabricated high-strength anchor), and also relates to a construction method of the PHA anchor. Background technique [0002] Whether it is for surface engineering such as slopes and foundation pits or for underground chambers such as tunnels and stopes, bolt support is a very common reinforcement and support method. Existing anchor rods are usually composed of anchor head, rod body, grout plug, backing plate, nut and other components. During construction, they cooperate with cast-in-place anchors to form an anchoring system. The construction process is as follows: [0003] (1) Mechanical equipment and materials enter the construction site; [0004] (2) Anchor hole positioning; [0005] (3) Drilling rigs or using casings to form holes; [0006] (4) clear hole; [0007] (5) Insert the anchor rod into the hole, and set up two pipes side by side with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/74E02D7/00E21D21/00E21D20/02
Inventor 周同和
Owner 周同和
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