CN103911993A - PHA (preliminary hazard analysis) anchor rod and construction method thereof - Google Patents

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

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Publication number
CN103911993A
CN103911993A CN201410156967.9A CN201410156967A CN103911993A CN 103911993 A CN103911993 A CN 103911993A CN 201410156967 A CN201410156967 A CN 201410156967A CN 103911993 A CN103911993 A CN 103911993A
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pha
anchoring body
anchoring element
anchor pole
construction method
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CN201410156967.9A
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CN103911993B (en
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周同和
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周同和
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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

A kind of PHA anchor pole and construction method thereof
Technical field
The invention belongs to support technology field, be specifically related to a kind of PHA anchor pole (prefabricated High strength bolt), also relate to the construction method of PHA anchor pole simultaneously.
Background technology
No matter be for the earth's surface such as side slope, foundation ditch engineering or to the underground chamber such as tunnel, stope, bolt support is all a kind of very conventional its support reinforcement mode.Existing anchor pole is made up of parts such as anchor head, the body of rod, stop grouting plug, backing plate, nuts conventionally, coordinates form anchoring system in construction with cast-in-place anchoring body, and its construction process is as follows:
(1) plant equipment and material enter job site;
(2) anchor hole location;
(3) rig pore-forming or utilize casing pipe hole forming;
(4) clear hole;
(5) anchor pole is implanted in hole, and setting and anchor pole two pipelines side by side;
(6) toward a pressure pouring cement mortar in anchor hole, cast limit, limit detaches a wherein Grouting Pipe (should extract sleeve pipe in slip casting while utilizing casing pipe hole forming simultaneously, both increased difficulty of construction, can affect again construction effect), percolating water in anchor hole is flowed out, until cement mortar is filled whole anchor hole along this pipeline;
(7) after slurry initial set, in another pipeline, carry out secondary pressure slip casting, fill up the space forming after once-cast initial set;
(8) slurry is mended in the contraction producing for cement paste after secondary grouting;
(9) after reaching designing requirement, slurry intensity carries out tensioning fixation;
(10) cement mortar length of time to after detect.
Generally use although above-mentioned technique is existing, but still have following problem:
1) no matter adopt cement mortar or cement paste pours into, all can produce larger amount of contraction, solidifying rear actual filling volume is negative, therefore, between cast-in-place anchoring body and hole wall, exist the frictional force between gap and the soil body to reduce, meanwhile, underground water is easily clamp-oned gap, further reduces the frictional force between anchor pole and hole wall.
2) secondary splitting grouting technique can cause very large disturbance to the soil body, while application, can cause the sedimentation of the foundation ditch periphery soil body in base pit engineering, even causes periphery house, road cracking.
3) after once grouting initial set, can carry out secondary grouting, after injecting cement paste intensity reaches designing requirement, can carry out tensioning fixation, the construction period is longer.
Summary of the invention
The object of the invention is for a kind of easy construction, anchor pole that intensity is higher are provided, the matching operation method that this anchor pole is provided is simultaneously another object of the present invention.
Based on above-mentioned purpose, the present invention has taked following technical scheme: a kind of PHA anchor pole, comprise bolt body, and described bolt body is arranged with the outer anchoring body of prefabricated pipe shape outward.
The outer anchoring body of described prefabricated tubulose is formed by connecting by multistage, engages fixing between each adjacent segment by adapter sleeve.
The outer every segment length 1~1.6m of anchoring body of described prefabricated tubulose.
The outer anchoring body wall thickness 25~40mm of described prefabricated tubulose, external diameter is 150~180mm.
The construction method of described PHA anchor pole, comprises the following steps: (1) pore-forming; (2) the outer anchoring body of the prefabricated tubulose of jacking, then outside prefabricated tubulose, jacking steel sleeve is continued in anchoring body outer end; (3) outside prefabricated tubulose, in anchoring body, implant bolt body, perfusion high grade (more than M15) cement paste or cement mortar, extract steel sleeve after having poured into; (4) mend slurry; (5) tensioning fixation.
Described step (1) adopts built-in auger stem operation to fetch earth and creeps into, and forms and draws the operation of directly carrying out step (2) behind hole.
Injected water mud off when described step (1) adopts auger stem boring, injects low strength cement slurry, and then carries out the operation of step (2) when rod pulling.
Described step (1) adopts the boring of umbrella shape drilling tool, creeps into the displacement of the water filling simultaneously soil body; The outer anchoring body of the prefabricated tubulose of jacking and steel sleeve successively when rig creeps into; When anchoring body outside prefabricated tubulose arrives behind precalculated position rod pulling and pours into low grade (below M10) cement paste (when needs bellend time can carry out churning reaming), and then carry out the operation of step (3).
For guaranteed strength, in the outer anchoring body employing of the prefabricated tubulose C80 concrete in the present invention, join cold-drawn low-carbon wire and be made; Being designed to multi-segment structure, is mainly to consider transport and easy construction.
Compared with common bolt, PHA anchor pole provided by the invention has following technical advantage:
1) outer anchoring body is prefabricated units, after buying, can directly use, and can significantly shorten man-hour;
2) prefabricated outer anchoring body is higher with cast-in-place anchoring body phase specific strength, is not easy to occur cracking destruction phenomenon;
3) outer anchoring body implant after without taking-up, easy construction and effective;
4) prefabricated outer anchoring body soil body in hole is combined closely, has avoided after common bolt slip casting because slurry shrinks the gap that forms between the soil body;
5) PHA bolt grouting all occurs in outer anchoring body inside, does not adopt secondary splitting grouting technique, has reduced the disturbance to the soil body.
Brief description of the drawings
Fig. 1 is the structural representation of PHA anchor pole of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, invention is described further.
embodiment 1
A kind of PHA anchor pole, as shown in Figure 1, comprises bolt body 4, the outer outer anchoring body 1 of prefabricated pipe shape that is arranged with of bolt body 4.The wall thickness of the outer anchoring body 1 of prefabricated tubulose is that 25mm, external diameter are 150, is formed by connecting by multistage, and every segment length 1.5m, engages fixing by adapter sleeve 3 between each adjacent segment.
Its construction method comprises the following steps:
(1) pore-forming: adopt built-in auger stem operation to fetch earth and creep into, form and draw hole;
(2) the outer anchoring body 1 of the prefabricated tubulose of jacking, then outside prefabricated tubulose, jacking steel sleeve is continued in anchoring body 1 outer end;
(3) outside prefabricated tubulose, in anchoring body 1, implant bolt body 4, perfusion high-mark cement slurry or cement mortar 2, extract steel sleeve after having poured into;
(4) mend slurry;
(5) tensioning fixation.
The present embodiment employing is drawn hole plunging and is implanted the outer anchoring body 1 of prefabricated tubulose, and its work progress is simple, and outer anchoring body 1 is high with the bond strength of surrounding soil, is particularly useful for Soft Soil Layer under groundwater table.
embodiment 2
A kind of PHA anchor pole, as shown in Figure 1, comprises bolt body 4, the outer outer anchoring body 1 of prefabricated pipe shape that is arranged with of bolt body 1.The wall thickness of the outer anchoring body 1 of prefabricated tubulose is that 40mm, external diameter are 180mm, is formed by connecting by multistage, and every segment length 1.5m, engages fixing by adapter sleeve 3 between each adjacent segment.
Its construction method comprises the following steps:
(1) pore-forming: injected water mud off when adopting auger stem boring, injects low strength cement slurry when rod pulling;
(2) the outer anchoring body 1 of the prefabricated tubulose of jacking, then outside prefabricated tubulose, jacking steel sleeve is continued in anchoring body 1 outer end;
(3) outside prefabricated tubulose, in anchoring body 1, implant bolt body 4, perfusion high-mark cement slurry or cement mortar 2, extract steel sleeve after having poured into;
(4) mend slurry;
(5) tensioning fixation.
The present embodiment adopts slip casting implantation to implant the outer anchoring body 1 of prefabricated tubulose, and retaining wall cement paste can also play the effect of the binding strength of strengthening outer anchoring body 1 and surrounding soil simultaneously, especially applicable to clay, silt and more closely knit layer of sand.
embodiment 3
A kind of PHA anchor pole, as shown in Figure 1, comprises bolt body 4, the outer outer anchoring body 1 of prefabricated pipe shape that is arranged with of bolt body 4.The wall thickness of the outer anchoring body 1 of prefabricated tubulose is that 30mm, external diameter are 160mm, is formed by connecting by multistage, and every segment length 1.5m, engages fixing by adapter sleeve 3 between each adjacent segment.
Its construction method comprises the following steps:
(1) pore-forming: adopt the boring of umbrella shape drilling tool, creep into the displacement of the water filling simultaneously soil body;
(2) the outer anchoring body 1 of the prefabricated tubulose of jacking and steel sleeve successively when rig creeps into, rod pulling pour into low strength cement and starch after anchoring body 1 arrives precalculated position prefabricated tubulose outside, can carry out churning reaming while needing bellend;
(3) outside prefabricated tubulose, in anchoring body 1, implant bolt body 4, perfusion high-mark cement slurry or cement mortar 2, extract steel sleeve after having poured into;
(4) mend slurry;
(5) tensioning fixation.
The present embodiment adopts drilling follow pipe method to implant outer anchoring body 1, can prevent in drilling process that hole wall collapse or quicksand fill boring, are applicable to scall and drifting sand layer.

Claims (8)

1. a PHA anchor pole, comprises bolt body, it is characterized in that, described bolt body is arranged with the outer anchoring body of prefabricated pipe shape outward.
2. PHA anchor pole as claimed in claim 1, is characterized in that, the outer anchoring body of described prefabricated tubulose is formed by connecting by multistage, engages fixing between each adjacent segment by adapter sleeve.
3. PHA anchor pole as claimed in claim 2, is characterized in that, the outer every segment length 1~1.6m of anchoring body of described prefabricated tubulose.
4. the PHA anchor pole as described in as arbitrary in claim 1-3, is characterized in that, the outer anchoring body wall thickness 25~40mm of described prefabricated tubulose, and external diameter is 150~180mm.
5. the construction method of the arbitrary described PHA anchor pole of claim 1-3, is characterized in that, comprises the following steps: (1) pore-forming; (2) the outer anchoring body of the prefabricated tubulose of jacking, then outside prefabricated tubulose, jacking steel sleeve is continued in anchoring body outer end; (3) outside prefabricated tubulose, in anchoring body, implant bolt body, perfusion high-mark cement slurry or cement mortar, extract steel sleeve after having poured into; (4) mend slurry; (5) tensioning fixation.
6. the construction method of PHA anchor pole described in claim 5, is characterized in that, described step (1) adopts built-in auger stem operation to fetch earth and creeps into, and forms and draws the operation of directly carrying out step (2) behind hole.
7. the construction method of PHA anchor pole described in claim 5, is characterized in that, injected water mud off when described step (1) adopts auger stem boring, injects low strength cement slurry, and then carry out the operation of step (2) when rod pulling.
8. the construction method of PHA anchor pole described in claim 5, is characterized in that, described step (1) adopts the boring of umbrella shape drilling tool, creeps into the displacement of the water filling simultaneously soil body; The outer anchoring body of the prefabricated tubulose of jacking and steel sleeve successively when rig creeps into; When anchoring body outside prefabricated tubulose arrives behind precalculated position rod pulling and pours into low strength cement slurry, and then carry out the operation of step (3).
CN201410156967.9A 2014-04-18 2014-04-18 A kind of PHA anchor pole and construction method thereof Active CN103911993B (en)

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CN103911993B CN103911993B (en) 2016-05-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104747216A (en) * 2015-04-22 2015-07-01 河南理工大学 Ultra-soft cracked coal and rock mass drill and grouting integrated fractional grouting method
CN104847389A (en) * 2015-05-13 2015-08-19 河南理工大学 Barrel type hollow grouting anchor rod and using method
CN105863699A (en) * 2016-05-25 2016-08-17 贵州大学 Grouting reinforcing large-deformation anchor bolt and method using grouting reinforcing large-deformation anchor bolt to reinforce rock body
CN105863695A (en) * 2016-05-03 2016-08-17 许国安 Sectional and modular combined anchor rod capable of resisting large deformation and impact and assembling method of combined anchor rod

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004059091A1 (en) * 2002-12-24 2004-07-15 Liuzhou Construction Machinery Factory General Pile-sheet anchor cable and the method of using the anchor cable to reinforce and brace the backfilled road bed and slope
CN201794071U (en) * 2009-12-11 2011-04-13 昆明军龙岩土工程有限公司 Prestressed anchor rod
CN102797256A (en) * 2012-09-11 2012-11-28 中建八局第三建设有限公司 Anchor-rope construction method for passing through soft-soil layer
CN103088819A (en) * 2013-02-22 2013-05-08 北京市公路桥梁建设集团有限公司 Pre-stressed anchor cable construction method
CN202989919U (en) * 2012-12-21 2013-06-12 中国建筑第四工程局有限公司 Pressure-bearing water-sand-layer anchor rod mounting structure
CN203808066U (en) * 2014-04-18 2014-09-03 周同和 PHA anchor rod

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004059091A1 (en) * 2002-12-24 2004-07-15 Liuzhou Construction Machinery Factory General Pile-sheet anchor cable and the method of using the anchor cable to reinforce and brace the backfilled road bed and slope
CN201794071U (en) * 2009-12-11 2011-04-13 昆明军龙岩土工程有限公司 Prestressed anchor rod
CN102797256A (en) * 2012-09-11 2012-11-28 中建八局第三建设有限公司 Anchor-rope construction method for passing through soft-soil layer
CN202989919U (en) * 2012-12-21 2013-06-12 中国建筑第四工程局有限公司 Pressure-bearing water-sand-layer anchor rod mounting structure
CN103088819A (en) * 2013-02-22 2013-05-08 北京市公路桥梁建设集团有限公司 Pre-stressed anchor cable construction method
CN203808066U (en) * 2014-04-18 2014-09-03 周同和 PHA anchor rod

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104747216A (en) * 2015-04-22 2015-07-01 河南理工大学 Ultra-soft cracked coal and rock mass drill and grouting integrated fractional grouting method
CN104847389A (en) * 2015-05-13 2015-08-19 河南理工大学 Barrel type hollow grouting anchor rod and using method
CN105863695A (en) * 2016-05-03 2016-08-17 许国安 Sectional and modular combined anchor rod capable of resisting large deformation and impact and assembling method of combined anchor rod
CN105863695B (en) * 2016-05-03 2017-11-03 许国安 A kind of anti-large deformation of sectional modular and shock resistance assembled bolt and its assemble method
CN105863699A (en) * 2016-05-25 2016-08-17 贵州大学 Grouting reinforcing large-deformation anchor bolt and method using grouting reinforcing large-deformation anchor bolt to reinforce rock body

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