CN112502754A - Construction method of oversized-diameter anchoring body - Google Patents
Construction method of oversized-diameter anchoring body Download PDFInfo
- Publication number
- CN112502754A CN112502754A CN202010749607.5A CN202010749607A CN112502754A CN 112502754 A CN112502754 A CN 112502754A CN 202010749607 A CN202010749607 A CN 202010749607A CN 112502754 A CN112502754 A CN 112502754A
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- steel plate
- diameter
- hole
- sleeve
- shoe
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- 238000010276 construction Methods 0.000 title claims abstract description 14
- 238000004873 anchoring Methods 0.000 title abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 92
- 239000010959 steel Substances 0.000 claims abstract description 92
- 239000002689 soil Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002893 slag Substances 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000005553 drilling Methods 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000003466 welding Methods 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000003754 machining Methods 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 description 7
- 239000002002 slurry Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
Abstract
The invention belongs to the technical field of geotechnical engineering anchoring, and particularly relates to a construction method of an ultra-large diameter anchoring body, which comprises the following steps: s1, manufacturing the symmetric steel plates of the sleeve shoe in an extending mode; s2, rotating, cutting soil and drilling; s3, casing follow-up; s4, high-pressure water slag return; s5, forming a hole with an oversized diameter; s6, manufacturing and installing an anchor rod body; s7, grouting the full-length hole section; s8, forming an ultra-large diameter anchor body; the steel plate is symmetrically arranged on the conventional casing shoe on the market to stretch out, the structure is simple, the length of the steel plate is determined according to the diameter of a reaming hole, the machining and the manufacturing are flexible and convenient, the steel plate is stretched out, soil is cut into slag under high-speed rotation, the soil body with the diameter larger than the range of the casing shoe is reamed to be the hole with the diameter larger than the diameter, the soil with the slag cut into slag by the steel plate is effectively and thoroughly cleaned out of the hole by drilling with a following pipe and high-pressure water, and the risk of hole wall collapse in the process of forming the hole with the larger.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering anchoring, and particularly relates to a construction method of an ultra-large diameter anchoring body.
Background
The conventional maximum anchoring body has the diameter of about 200mm, the uplift bearing capacity of the anchor rod in unit length is small, and a long anchoring body is often needed in engineering application so as to meet the uplift bearing capacity requirement of the anchor rod. Longer anchor needs the longer stock body of rod, needs longer stock pore-forming length, needs the higher economic expense of expense, still needs to have the outer anchor soil body space of great slip fracture face. In urban infrastructure construction, the land utilization rate is high, and the land space utilization outside the red-infrared line outer supporting main body has more restrictions. Under the condition that the uplift bearing capacity of the anchor rod is not changed, the diameter of the anchoring body is only increased, and the difficulty of limited anchoring soil body space outside the sliding crack surface is overcome.
There are some reamer heads that are used to form holes in large diameter anchors, which are complicated and require separate additional arrangements. And the problems of unclean soil and residue cleaning in the hole and hole wall collapse caused by unbalanced hole wall soil pressure during large-diameter hole forming are easy to occur, the strength and integrity control indexes of the anchoring body are influenced, and engineering accidents caused by insufficient bearing capacity of the anchor cable are often caused.
Therefore, the person skilled in the art proposes a construction method for an extra-large diameter anchor to solve the problems mentioned in the background above.
Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a construction method of an extra-large-diameter anchoring body, which has the characteristics of simple structure, flexible and convenient processing and manufacturing, and the length of a steel plate is determined according to the diameter of a reaming hole.
In order to achieve the purpose, the invention provides the following technical scheme: a construction method of an oversized-diameter anchor body comprises the following steps:
s1, manufacturing the symmetric steel plates of the sleeve shoe in an extending mode;
s2, rotating, cutting soil and drilling;
s3, casing follow-up;
s4, high-pressure water slag return;
s5, forming a hole with an oversized diameter;
s6, manufacturing and installing an anchor rod body;
s7, grouting the full-length hole section;
and S8, forming an ultra-large diameter anchor body.
Preferably, the casing shoe that the preparation was stretched out to the symmetrical steel sheet in step S1 is installed in the sleeve pipe front end, and the steel sheet uses the sheathed tube axis is the central line with the casing shoe flushes the symmetry and welds, the sleeve pipe is rotatory under the motor traction, the soil is cut in the steel sheet rotation, and the hole is cleared to the anti-sediment of high pressure water, the sleeve pipe follows to the hole bottom, and the super large diameter pore-forming wall is accomplished, carries out body of rod preparation and installation, carries out full length hole section slip casting.
Preferably, the steel plates are symmetrically arranged by taking the axis of the sleeve as a center line, the thickness of each steel plate is 3-5mm, the width of each steel plate is 30-50mm, the top width of each steel plate can be smaller than the bottom width of each steel plate, the length of each steel plate is 50-100mm, and the steel plates and the sleeve shoes are welded in a flush mode.
Preferably, step S5 is followed by using the casing, and the hole is cleaned by positive circulation high pressure water back slag in the casing.
Preferably, the outer layer of the free section of the rod body is coated with the butter back-cover plastic pipe.
Preferably, the grouting is full grouting of the full-length hole section.
Preferably, the steel plate in step S1 is a commercially available conventional sleeve shoe with protruding steel plates symmetrically disposed thereon.
Preferably, step S2 is to dig earth and slag under high speed rotation of the steel plate.
Compared with the prior art, the invention has the beneficial effects that:
1. the steel plate extension is symmetrically arranged on the conventional casing shoe in the market, so that the structure is simple, the length of the steel plate is determined according to the diameter of the expanded hole, and the processing and the manufacturing are flexible and convenient.
2. And (3) cutting soil and slagging under high-speed rotation of the extended steel plate to complete the reaming of the soil body with the ultra-large diameter outside the range of the casing shoe.
3. The soil for cutting the steel plate into slag is effectively and thoroughly cleaned out of the hole through pipe following drilling and high-pressure water slag return, and the pressure water is acted between the casing wall and the hole wall, so that the risk of hole wall collapse in the process of forming the hole with the ultra-large diameter can be reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a construction method of an extra-large diameter anchor according to the present invention.
Fig. 2, 3 and 4 are sectional views taken along the direction a-a of fig. 1 according to the present invention.
FIG. 5 is a structural view of a sleeve shoe welded steel plate of a construction method of an oversized-diameter anchor according to the present invention;
in the figure: 1. the surface of the soil body; 2. a sleeve; 3. a casing shoe; 4. a steel plate; 5. a hole wall with an ultra-large diameter; 6. the welding point of the sleeve shoe and the steel plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-5, the present invention provides the following technical solutions: a construction method of an oversized-diameter anchor body comprises the following steps:
s1, manufacturing the symmetric steel plates of the sleeve shoe in an extending mode;
s2, rotating, cutting soil and drilling;
s3, casing follow-up;
s4, high-pressure water slag return;
s5, forming a hole with an oversized diameter;
s6, manufacturing and installing an anchor rod body;
s7, grouting the full-length hole section;
and S8, forming an ultra-large diameter anchor body.
Specifically, in the step S1, the casing shoe 1 made by stretching out the symmetrical steel plate is installed at the front end of the casing 2, the steel plate 4 is in flush symmetrical welding with the casing shoe 3 by taking the axis of the casing 2 as the center line, the casing 2 rotates under the traction of the motor, the steel plate 4 rotates to cut soil, the high-pressure water is used for slag back hole cleaning, the casing 2 follows to the bottom of the hole, the ultra-large diameter hole forming wall 5 is completed, the rod body is made and installed, and full-length hole section grouting is performed.
Specifically, the steel plate 4 is symmetrically arranged by taking the axis of the casing pipe 2 as a center line, the thickness of the steel plate 4 is 3mm, the width of the steel plate 4 is 30mm, the top width of the steel plate 4 can be smaller than the bottom width, the length of the steel plate 4 is 50mm, and the steel plate 4 and the casing shoe 3 are welded in a flush mode.
Specifically, step S5 is implemented by following casing 2, and cleaning holes by positive-circulation high-pressure water and slag in casing 2.
Specifically, the outer layer of the free section of the rod body is coated with the grease and then sleeved with the plastic pipe.
Specifically, the grouting is full grouting of the full-length hole section.
Specifically, the steel plate in step S1 is a commercially available conventional sleeve shoe on which protruding steel plates are symmetrically disposed.
Specifically, in step S2, the steel plate is extended and the earth is cut and slagged under high-speed rotation.
Example 2
Referring to fig. 1-5, the present invention provides the following technical solutions: a construction method of an oversized-diameter anchor body comprises the following steps:
s1, manufacturing the symmetric steel plates of the sleeve shoe in an extending mode;
s2, rotating, cutting soil and drilling;
s3, casing follow-up;
s4, high-pressure water slag return;
s5, forming a hole with an oversized diameter;
s6, manufacturing and installing an anchor rod body;
s7, grouting the full-length hole section;
and S8, forming an ultra-large diameter anchor body.
Specifically, in the step S1, the casing shoe 1 made by stretching out the symmetrical steel plate is installed at the front end of the casing 2, the steel plate 4 is in flush symmetrical welding with the casing shoe 3 by taking the axis of the casing 2 as the center line, the casing 2 rotates under the traction of the motor, the steel plate 4 rotates to cut soil, the high-pressure water is used for slag back hole cleaning, the casing 2 follows to the bottom of the hole, the ultra-large diameter hole forming wall 5 is completed, the rod body is made and installed, and full-length hole section grouting is performed.
Specifically, the steel plate 4 is symmetrically arranged by taking the axis of the casing pipe 2 as a center line, the thickness of the steel plate 4 is 4mm, the width of the steel plate 4 is 40mm, the top width of the steel plate 4 can be smaller than the bottom width, the length of the steel plate 4 is 80mm, and the steel plate 4 and the casing shoe 3 are welded in a flush mode.
Specifically, step S5 is implemented by following casing 2, and cleaning holes by positive-circulation high-pressure water and slag in casing 2.
Specifically, the outer layer of the free section of the rod body is coated with the grease and then sleeved with the plastic pipe.
Specifically, the grouting is full grouting of the full-length hole section.
Specifically, the steel plate in step S1 is a commercially available conventional sleeve shoe on which protruding steel plates are symmetrically disposed.
Specifically, in step S2, the steel plate is extended and the earth is cut and slagged under high-speed rotation.
Example 3
Referring to fig. 1-5, the present invention provides the following technical solutions: a construction method of an oversized-diameter anchor body comprises the following steps:
s1, manufacturing the symmetric steel plates of the sleeve shoe in an extending mode;
s2, rotating, cutting soil and drilling;
s3, casing follow-up;
s4, high-pressure water slag return;
s5, forming a hole with an oversized diameter;
s6, manufacturing and installing an anchor rod body;
s7, grouting the full-length hole section;
and S8, forming an ultra-large diameter anchor body.
Specifically, in the step S1, the casing shoe 1 made by stretching out the symmetrical steel plate is installed at the front end of the casing 2, the steel plate 4 is in flush symmetrical welding with the casing shoe 3 by taking the axis of the casing 2 as the center line, the casing 2 rotates under the traction of the motor, the steel plate 4 rotates to cut soil, the high-pressure water is used for slag back hole cleaning, the casing 2 follows to the bottom of the hole, the ultra-large diameter hole forming wall 5 is completed, the rod body is made and installed, and full-length hole section grouting is performed.
Specifically, the steel plate 4 is symmetrically arranged by taking the axis of the casing pipe 2 as a center line, the thickness of the steel plate 4 is 5mm, the width of the steel plate 4 is 50mm, the top width of the steel plate 4 can be smaller than the bottom width, the length of the steel plate 4 is 100mm, and the steel plate 4 and the casing shoe 3 are welded in a flush mode.
Specifically, step S5 is implemented by following casing 2, and cleaning holes by positive-circulation high-pressure water and slag in casing 2.
Specifically, the outer layer of the free section of the rod body is coated with the grease and then sleeved with the plastic pipe.
Specifically, the grouting is full grouting of the full-length hole section.
Specifically, the steel plate in step S1 is a commercially available conventional sleeve shoe on which protruding steel plates are symmetrically disposed.
Specifically, in step S2, the steel plate is extended and the earth is cut and slagged under high-speed rotation.
The working principle and the using process of the invention are as follows: the anchor rod construction work can be prepared after the anchor rod implementation scheme is determined according to the rock and soil layer conditions revealed in the geological exploration, and the method comprises the following steps:
(1) and (3) manufacturing the symmetrical steel plates of the sleeve shoe in an extending manner: selecting a steel plate with the thickness of 3-5mm according to the diameter of a casing shoe, selecting the width of the steel plate to be 30-50mm, wherein the top width is smaller than the bottom width, the thickness and the width of the steel plate are suitable for welding the steel plate on the outer wall of the casing shoe used on site, the length of the steel plate is determined according to the diameter needing hole expansion, the length of the steel plate is preferably 50-100mm, the steel plate is flush with the casing shoe, four steel plates can be welded on a symmetrical axis, the included angle is 90 degrees, three steel plates can also be welded, the included angle is 60 degrees, in pile arrangement and anchor rod support adopted in foundation pit engineering or slope engineering, the space between pile arrangements is smaller, when the diameter of a required anchoring body needs to be larger than the space between the pile arrangements so as to meet the requirement of bearing capacity;
(2) and (3) rotary earth cutting drilling: installing and fixing a sleeve of the machined sleeve shoe, starting a motor to carry out soil cutting drilling, wherein in the foundation pit engineering or slope engineering adopting row piles and anchor rod support, the row pile spacing is smaller, when the diameter of a required anchoring body needs to be larger than the row pile spacing so as to meet the bearing capacity requirement, firstly adopting a direct pressing-in method in the row pile range, manually removing local soil mass if necessary to enable a steel plate to pass through the row pile range, and then starting the motor to carry out soil cutting drilling;
(3) casing follow-up: the casing pipe is connected with the drill pipe in a section-by-section mode along the drilling length;
(4) slag removal by high-pressure water: during drilling, a high-pressure water pump capable of adjusting water pressure is adopted, soil residues are washed through positive circulation in the sleeve, and the soil residues and water flow out from a gap between the wall of the sleeve and the wall of the hole;
(5) forming holes with super large diameters: the sleeve shoe reaches the designed depth of the anchor rod, and the hole forming with the oversized diameter is finished;
(6) manufacturing and installing an anchor rod body: coating grease on the outer layer of the free section of the rod body, then sleeving a plastic pipe, binding the anchor rod supporting body and the grouting pipe together, and pushing the bound anchor rod supporting body and the grouting pipe to the end part of the anchor rod through the inside of the sleeve to finish the installation of the rod body;
(7) grouting the full-length hole section: grouting from the bottom of the hole through a grouting pipe, wherein the grouting can flow out along with slurry until the slurry overflows from an orifice;
(8) forming an oversized-diameter anchor body: slowly pulling out the sleeve, replenishing the slurry to the orifice, and forming an anchor body with an ultra-large diameter when the strength of the slurry meets the design requirement;
the number and the interval of the extending steel plates and the length of the steel plates are determined according to specific implementation conditions;
wherein, as shown in fig. 1: a is the water flow direction and b is the rotation direction of the sleeve.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The phrase "comprising a defined element does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A construction method of an oversized-diameter anchor body is characterized by comprising the following steps:
s1, manufacturing the symmetric steel plates of the sleeve shoe in an extending mode;
s2, rotating, cutting soil and drilling;
s3, casing follow-up;
s4, high-pressure water slag return;
s5, forming a hole with an oversized diameter;
s6, manufacturing and installing an anchor rod body;
s7, grouting the full-length hole section;
and S8, forming an ultra-large diameter anchor body.
2. The method for constructing the extra-large-diameter anchor body according to claim 1, wherein the method comprises the following steps: in the step S1, the sleeve shoe (1) which is made by stretching out a symmetrical steel plate is installed at the front end of the sleeve (2), the steel plate (4) is in flush symmetrical welding with the sleeve shoe (3) by taking the axis of the sleeve (2) as a central line, the sleeve (2) rotates under the traction of a motor, the steel plate (4) rotates to cut soil, high-pressure water is used for slag removal, the sleeve (2) follows to the bottom of a hole, the ultra-large diameter hole forming wall (5) is completed, the rod body is manufactured and installed, and full-length hole section grouting is performed.
3. The method for constructing the extra-large-diameter anchor body according to claim 2, wherein the method comprises the following steps: the steel plate (4) is symmetrically arranged by taking the axis of the casing pipe (2) as a center line, the thickness of the steel plate (4) is 3-5mm, the width of the steel plate (4) is 30-50mm, the top width of the steel plate (4) can be smaller than the bottom width, the length of the steel plate (4) is 50-100mm, and the steel plate (4) and the casing pipe shoe (3) are welded in a flush mode.
4. The method for constructing the extra-large-diameter anchor body according to claim 2, wherein the method comprises the following steps: and step S5, the sleeve (2) is adopted to follow, and the positive circulation high-pressure water is used for slag back-flushing in the sleeve (2).
5. The method for constructing the extra-large-diameter anchor body according to claim 2, wherein the method comprises the following steps: the outer layer of the free section of the rod body is coated with grease and then sleeved with a plastic pipe.
6. The method for constructing the extra-large-diameter anchor body according to claim 2, wherein the method comprises the following steps: and the grouting is to perform full grouting on the full-length hole section.
7. The method for constructing the extra-large-diameter anchor body according to claim 2, wherein the method comprises the following steps: the steel plate in step S1 is a commercially available conventional sleeve shoe on which protruding steel plates are symmetrically disposed.
8. The method for constructing the extra-large-diameter anchor body according to claim 2, wherein the method comprises the following steps: in step S2, the steel plate is extended and the earth is cut and slagged under high speed rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010749607.5A CN112502754A (en) | 2020-07-30 | 2020-07-30 | Construction method of oversized-diameter anchoring body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010749607.5A CN112502754A (en) | 2020-07-30 | 2020-07-30 | Construction method of oversized-diameter anchoring body |
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| CN112502754A true CN112502754A (en) | 2021-03-16 |
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| CN202010749607.5A Pending CN112502754A (en) | 2020-07-30 | 2020-07-30 | Construction method of oversized-diameter anchoring body |
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| JP2000178961A (en) * | 1998-12-18 | 2000-06-27 | Hokuriku Regional Agricultural Administration Office Maff | Foundation treating method for collapsing geological features |
| CN1727580A (en) * | 2005-05-31 | 2006-02-01 | 刘思谋 | File head broken by water injection |
| JP2007211412A (en) * | 2006-02-07 | 2007-08-23 | Honma Giken Kk | Anchor construction method |
| CN205805454U (en) * | 2016-06-06 | 2016-12-14 | 深圳市工勘岩土集团有限公司 | The deslagging head of double-jacket tube rig |
| CN207879258U (en) * | 2018-02-02 | 2018-09-18 | 中冶集团武汉勘察研究院有限公司 | A kind of anchor pole pipe-following drilling Counterboring apparatus |
| CN108842764A (en) * | 2018-06-01 | 2018-11-20 | 中力建设集团有限公司 | A kind of Stirring formula anchor tube construction method |
| CN109026097A (en) * | 2018-07-17 | 2018-12-18 | 深圳市工勘岩土集团有限公司 | A kind of double drill bit drilling construction methods of anti-float anchor rod |
| CN109763486A (en) * | 2019-01-20 | 2019-05-17 | 王琪 | A kind of displaced type rotary jet grouting anchor pole and construction method |
| CN209261488U (en) * | 2018-12-28 | 2019-08-16 | 福建省龙湟市政工程有限公司 | A kind of anchor cable multistage subsection is discontinuous with pipe structure |
-
2020
- 2020-07-30 CN CN202010749607.5A patent/CN112502754A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000178961A (en) * | 1998-12-18 | 2000-06-27 | Hokuriku Regional Agricultural Administration Office Maff | Foundation treating method for collapsing geological features |
| CN1727580A (en) * | 2005-05-31 | 2006-02-01 | 刘思谋 | File head broken by water injection |
| JP2007211412A (en) * | 2006-02-07 | 2007-08-23 | Honma Giken Kk | Anchor construction method |
| CN205805454U (en) * | 2016-06-06 | 2016-12-14 | 深圳市工勘岩土集团有限公司 | The deslagging head of double-jacket tube rig |
| CN207879258U (en) * | 2018-02-02 | 2018-09-18 | 中冶集团武汉勘察研究院有限公司 | A kind of anchor pole pipe-following drilling Counterboring apparatus |
| CN108842764A (en) * | 2018-06-01 | 2018-11-20 | 中力建设集团有限公司 | A kind of Stirring formula anchor tube construction method |
| CN109026097A (en) * | 2018-07-17 | 2018-12-18 | 深圳市工勘岩土集团有限公司 | A kind of double drill bit drilling construction methods of anti-float anchor rod |
| CN209261488U (en) * | 2018-12-28 | 2019-08-16 | 福建省龙湟市政工程有限公司 | A kind of anchor cable multistage subsection is discontinuous with pipe structure |
| CN109763486A (en) * | 2019-01-20 | 2019-05-17 | 王琪 | A kind of displaced type rotary jet grouting anchor pole and construction method |
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Application publication date: 20210316 |