CN116479899A - Recoverable rotary-spraying enlarged-head anchor cable and construction method - Google Patents
Recoverable rotary-spraying enlarged-head anchor cable and construction method Download PDFInfo
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- CN116479899A CN116479899A CN202310339417.XA CN202310339417A CN116479899A CN 116479899 A CN116479899 A CN 116479899A CN 202310339417 A CN202310339417 A CN 202310339417A CN 116479899 A CN116479899 A CN 116479899A
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- 238000005507 spraying Methods 0.000 title claims abstract description 66
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 76
- 239000010959 steel Substances 0.000 claims abstract description 76
- 238000004873 anchoring Methods 0.000 claims abstract description 61
- 238000004064 recycling Methods 0.000 claims abstract description 21
- 230000001681 protective effect Effects 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims description 45
- 238000005553 drilling Methods 0.000 claims description 38
- 239000002002 slurry Substances 0.000 claims description 36
- 239000002689 soil Substances 0.000 claims description 33
- 238000011084 recovery Methods 0.000 claims description 26
- 238000013461 design Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- 238000013459 approach Methods 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a recoverable rotary spraying enlarged head anchor cable and a construction method. The locking and recovering device and the protective sleeve can form a closed space of the prestress steel strands, the prestress steel strands are not affected, the recovering reliability is improved, the unlocking and recovering effects are better, the locking and recovering device is simple in structure, large in anchoring force, large-scale in production and high in cost performance; the locking and releasing of the recyclable anchor cable is simpler and more convenient, and the manual recycling is convenient to operate and reliable.
Description
Technical Field
The invention relates to the technical field of anchor cables, in particular to a recyclable rotary-spraying enlarged head anchor cable and a construction method.
Background
In the construction foundation pit engineering, the cast-in-place piles and anchor cable supports are commonly used in the deep foundation pit supports, the anchor cable is generally longer, red lines can possibly appear, the construction influence on subway shields and the like in the future can be possibly caused, the underground pollution is reduced, and the recyclable anchor cable is often adopted in the design and construction; after the main body structure is constructed and replaced, the anchor cable which is arranged in the underground soil body in the prior construction is recovered, and the steel strand is recycled, so that the cost can be reduced, and the requirement of low carbon and environmental protection is met.
The pulling resistance of the anchor cable is provided by the friction between the anchoring section and surrounding soil, and the anchor cable of the stratum is long when the anchor cable is used as a foundation pit supporting structure because of thick silt layer, sand layer or powdery clay in the stratum and deep burial depth of the stratum in some projects; some engineering surrounding buildings, and when anchor cables enter the stratum under the basement of the surrounding buildings, the original engineering piles can be influenced, so that unnecessary disputes are caused; if the pulling resistance of the common anchor cable with reduced length can not meet the design requirement, the length of the anchoring section of the anchor cable can be greatly reduced by adopting the enlarged head anchor cable, and the problems can be solved.
In actual use, the recyclable anchor cable may be tens of meters or hundreds of meters, and the recycling method of the recyclable anchor cable generally needs to rotate the anchor cable from the tension end of the waist beam of the anchor cable or push the anchor cable into the positioning and unlocking device, so that the anchoring end in the soil can unlock the anchor cable, and the steel strands at the anchoring end are released to recycle the anchor cable; because the anchor cable has larger flexible elasticity and length, the anchor cable is influenced by the friction resistance of the sheath and the flexibility and elasticity of the anchor cable, the acting force of the rotation or thrust of the anchor cable is difficult to transfer to the other end or the acting force of the thrust of the anchor cable is very small when the acting force is transferred to the other end; when the large tonnage is tensioned, the anchor cable is tightly locked at the anchoring end by larger tensioning force, the locking force of the anchor clamping piece of the anchoring end in the soil body to the anchor cable is larger, the unlocking rotation and the pushing force are also larger, the locking force of the anchor clamping piece cannot be overcome by the rotation and the pushing force of the tensioning section to the anchor cable, and the anchor cable cannot be rotated and pushed at all, so that the anchor cable cannot be unlocked, and the anchor cable recovery fails; the longer the length of the anchor cable, the larger the tension locking or actual stress tonnage, and the higher the risks of failure of unlocking the anchoring end and failure of recycling the anchor cable.
The exterior of the bearing plate of the anchoring end head of the soil body is a totally-enclosed conical sleeve and is made into a conical head, and the recyclable expanding head anchor cable is pressure or pressure dispersion; although grouting or rotary spraying exceeds the hole bottom anchoring section, the rear rotary spraying drill rod nozzle of the lower anchor cable is directly propped in the conical head, the rotary spraying is performed again without exceeding the anchoring end head, the anchoring end head (conical head) is not necessarily positioned at the center of the rotary spraying expansion head pile when reaching the hole bottom, and along with the exit of the drill rod, the whole anchor cable can slide downwards, so that the direct adhesion between the anchoring end head and the rotary spraying expansion cement soil body has the risks of defects such as void and incomplete, and the like, so that the bearing plate of the anchoring end head and the anchoring section of the expansion head have defects, thereby influencing the tensile force of the recoverable expansion head anchor cable.
The recyclable anchor cable disclosed by the invention is characterized in that the anchoring end recycling device is wrapped by a fairing or a conical sleeve and is internally communicated with each other; when the recovery device or the steel strand protection sleeve of a certain strand of anchor cable is filled with water slurry, cement slurry is filled in all strands of anchor cable due to all intercommunication, and the recovery device or the protection sleeve is filled with cement slurry, so that the strand of anchor cable cannot be pulled out to influence the recovery failure of the whole anchor cable; the bearing plate is one, the anchoring force is limited, and the tensile force material performance of the steel strand cannot be fully exerted.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a recoverable rotary jet expansion head anchor cable and a construction method.
The aim of the invention is achieved by the following technical scheme: the utility model provides a recoverable rotary spraying enlarged head anchor rope, includes rotary spraying drill bit, lock solid recovery unit, recoverable anchor rope, drilling rod, protective sleeve and prestressing force steel strand wires, lock solid recovery unit includes pressure-bearing cover plate, pressure-bearing anchor plate, bolt, lock solid structure, release structure and rotation pressure bearing, rotary spraying drill bit pass through rotation pressure bearing install in pressure-bearing anchor plate, rotary spraying drill bit's one end passes in proper order pressure-bearing anchor plate with pressure-bearing anchor plate, rotary spraying drill bit's the other end with the drilling rod is connected, recoverable anchor rope pass through lock solid structure's one end install in pressure-bearing anchor plate, release structure's one end respectively with recoverable anchor rope's one end with lock solid structure is connected, release structure's the other end with prestressing force steel strand wires's one end is connected, protective sleeve's one end with pressure-bearing anchor plate is connected, prestressing force steel strand wires's the other end with lock solid structure's the other end all stretches out in protective sleeve's the other end, the cover plate passes through the pressure-bearing anchor plate and is connected with pressure-bearing anchor plate.
More preferably, the release structure comprises a steel bushing pipe, a spring, a positioning receiving block, a guide pipe and a lock catch, wherein two ends of the steel bushing pipe are respectively connected with the pressure-bearing cover plate and the pressure-bearing anchor plate, the positioning receiving block is installed on the inner wall of the steel bushing pipe through the guide pipe, the guide pipe is installed on the pressure-bearing cover plate through the lock catch, one end of the positioning receiving block is matched with the lock catch, the other end of the positioning receiving block is connected with one end of the recyclable anchor cable through a guide connecting wire, and the other end of the positioning receiving block is connected with the locking structure through the spring.
More preferably, the positioning receiving block comprises a self-locking joint, a guide cylinder and a connecting part which are sequentially connected, the self-locking joint is matched with the lock catch, the guide cylinder is movably installed in the guide pipe, the connecting part is connected with the guide connecting wire, and the guide cylinder is connected with the spring.
More preferably, the locking structure comprises an anchor guiding and protecting pipe, a pin-fastening steel wire, a connecting pipe and an anchor clamping piece, the pressure-bearing anchor plate is provided with a plurality of conical seat sleeves, the conical seat sleeves are distributed around the rotary jet drill bit, the recyclable anchor cable is installed on the conical seat sleeves through the anchor clamping piece, the connecting pipe is communicated with the conical seat sleeves, the connecting pipe is installed on the anchor guiding and protecting pipe, the anchor guiding and protecting pipe is installed on the protective sleeve, the other end of the recyclable anchor cable penetrates through the connecting pipe and is connected with one end of the prestress steel wire, one end of the pin-fastening steel wire is clamped between the conical seat sleeves and the anchor clamping piece, and the other end of the pin-fastening steel wire penetrates through the connecting pipe, the anchor guiding and protecting pipe and the protective sleeve in sequence.
More preferably, the rotary spraying drill bit is provided with two high-pressure nozzles, one high-pressure nozzle is located at one side of the pressure-bearing cover plate away from the pressure-bearing anchor plate, and the other high-pressure nozzle is located between the pressure-bearing cover plate and the pressure-bearing anchor plate.
More preferably, the bolt comprises a nut and a fixing screw, one end of the fixing screw penetrates through the pressure-bearing cover plate to be connected with one nut, and the other end of the fixing screw penetrates through the pressure-bearing anchor plate to be connected with the other nut.
A construction method of a recoverable rotary-spraying enlarged head anchor cable comprises the following steps:
s1, setting drilling positions in a foundation pit according to elevation and horizontal spacing required by design, and trimming a drilling machine working soil platform according to the drilling positions;
s2, installing an anchor rod drilling machine on the drilling machine working soil platform in the step S1, installing a rotary jet drill bit on a drill rod of the anchor rod drilling machine, and drilling holes by aiming at the drilling holes by the rotary jet drill bit until the rotary drill bit reaches the junction of the conventional anchoring section and the enlarged head anchoring section, and stopping drilling holes to finish the construction of the conventional anchoring section;
s3, starting a high-pressure pump to provide cement slurry for the rotary spraying drill bit, starting the rotary spraying drill bit to rotate, performing rotary spraying cutting on soil body by the cement slurry to form a large-diameter cement soil cylindrical pile body, and starting a grouting mode of the rotary spraying drill bit to perform grouting on the large-diameter cement soil cylindrical pile body to finish construction of an enlarged head anchoring section;
s4, pulling the drill rod and the rotary spraying drill bit out of the drill hole, then detaching the rotary spraying drill bit from the drill rod, installing the rotary spraying drill bit and the recoverable anchor cable on a locking recovery device, and installing the locking recovery device on the drill rod;
s5, pushing the cement slurry to the enlarged head anchoring section by adopting a rotary jet drill bit, starting a high-pressure pump, conveying the cement slurry to the rotary jet drill bit by the high-pressure pump, starting the rotary jet drill bit to rotate, carrying out rotary jet cutting on soil body by cement, increasing the diameter of the enlarged head anchoring section, and simultaneously filling the cement slurry in the enlarged head anchoring section to complete secondary slurry supplementing of the enlarged head anchoring section;
s6, tensioning the prestressed steel strand in a tensioning section, wherein the prestressed steel strand drives the recoverable anchor cable to be tensioned, and the recoverable anchor cable is locked by the anchor clamping piece and the conical seat sleeve;
s7, recycling the recyclable anchor cable from the locking recycling device.
More preferably, step S6 includes the steps of:
s601, tensioning each prestress steel strand for the first time according to the design tensioning force of 30% of the prestress steel strands;
s602, tensioning the whole prestress steel strand for the second time according to the design tensioning force of the recyclable anchor cable, wherein the recyclable anchor cable drives the positioning receiving block to approach the conical seat sleeve through the guide connecting wire, the positioning receiving block compresses the anchor clamping piece through the spring, and meanwhile the recyclable anchor cable drives the anchor clamping piece to compress the conical seat sleeve for locking.
More preferably, step S7 includes the steps of:
s701, pulling out the pin steel wire from between the conical seat sleeve and the anchor clamping piece by adopting a jack, wherein the locking force of the anchor clamping piece and the conical seat sleeve on the recyclable anchor cable is reduced or eliminated;
s702, the anchor cable is rotated and pushed into the conical seat sleeve, the anchor cable pushes the positioning receiving block to approach the lock catch through the spring, the self-locking connector of the positioning receiving block is automatically connected with the lock catch, meanwhile, the spring drives the anchor clamping piece to separate from the conical seat sleeve, the recyclable anchor cable is pulled outwards from the conical seat sleeve, and the recyclable anchor cable is separated from the anchor clamping piece, the conical seat sleeve and the anchor guiding protection tube in sequence, so that recycling of the recyclable anchor cable is completed.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the rotary spraying drill bit, the locking and recycling device, the recyclable anchor cable, the drill rod, the protective sleeve and the prestressed steel strand form a closed space of the prestressed steel strand, the prestressed steel strand is not affected, and the recycling reliability is improved; the unlocking recovery effect is better, the locking recovery device has simple structure, large anchoring force, large-scale production and high cost performance; the locking and releasing of the recyclable anchor cable is simpler and more convenient, and the manual recycling is convenient to operate and reliable.
2. The construction method of the recoverable rotary spraying expansion head anchor cable can overcome the defect that the anchor cable anchoring end head and the rotary spraying expansion head cement slurry are glued, the locking recovery device is tightly combined with cement slurry, the anchor cable anchoring force can be ensured, the anchoring force is large, the force-bearing force transmission is reliable, and the large-tonnage anchoring tension force can be provided.
Drawings
FIG. 1 is a schematic view of a locking and recycling device for recycling a rotary jet expansion head anchor cable of the invention;
FIG. 2 is a cross-sectional view of a pressure-bearing anchor plate of a lock recovery device for a recoverable rotary jet expansion head anchor cable of the present invention;
FIG. 3 is a cross-sectional view of a lock recovery device for a recoverable rotary jet enlarged head anchor cable of the present invention;
fig. 4 is a schematic diagram of unlocking a recoverable anchor cable of a locking and recovering device of a recoverable rotary-spraying enlarged head anchor cable of the invention;
fig. 5 is a schematic view of a construction method of a recoverable rotary jet expansion head anchor cable of the present invention;
FIG. 6 is a schematic illustration of an enlarged head anchor section of a construction method;
FIG. 7 is a schematic view of a conventional anchor section of a construction method;
FIG. 8 is a free-section schematic of the construction method;
FIG. 9 is a schematic diagram of a tensioning section of a construction method;
FIG. 10 is a schematic view of a positioning receiving block of a lock recovery device for a recoverable rotary jet enlarged head anchor cable;
the reference numerals for the various parts in the drawings: 1-a pressure-bearing cover plate; 101-a pressure bearing plate; 102-screw holes; 103-a through hole; 2-bearing anchor plates; 201-a through hole; 202-a conical sleeve; 3-bolts; 301-fixing a screw; 302-a nut; 40-locking structure; 401-an anchor guide and protection tube; 402-pinning the steel wire; 403-connecting pipes; 404-clamping anchor sheets; 41-release structure; 411-steel sleeve pipe; 412-a spring; 413-locating the receiving block; 4131-self locking joint; 4132-guide cylinder; 4133-a connection; 414-a catheter; 415-locking; 416-a guide connection line; 5-a rotary pressure bearing; 601-drill pipe; 602-a rotary jet drill bit; 6021-high pressure nozzle; 701-an enlarged head anchor segment; 702-a conventional anchor section; 703-free segment; 704-stretching the section; 706-locking and recycling device; 707-prestress wire; 708-a protective sleeve; 709-embedding a PVC pipe; 710-anchor pad; 711-spraying an anchor surface layer; 8-recoverable anchor lines.
Detailed Description
The present invention will be described in further detail with reference to the drawings and specific examples, which are not to be construed as limiting the embodiments of the present invention.
The anchor cable is widely used in foundation pit supporting engineering, the recyclable anchor cable 8 in temporary foundation pit engineering can recycle the prestressed steel strand 707 in the soil as secondary recycling, the whole length of a rod body of the recyclable anchor cable 8 is free and unbonded, the prestressed steel strand 707 is sleeved with a protective sleeve 708, and the protective sleeve 708 is a PVC rubber pipe. In the enlarged footing anchor section 701 in the soil body, the recoverable anchor cable 8 is connected with the conical seat sleeve 202 of the pressure-bearing anchor plate 2, the pressure-bearing anchor plate 2 transmits cement slurry to the enlarged footing anchor section 701 in a pressure mode, and shearing and friction resistance is generated between the cement slurry and rock or the soil body, so that the anchor cable and tension anchor is realized, and the anchor force of the recoverable and amplified anchor cable is mainly generated in the enlarged footing anchor section 701.
As shown in FIG. 6, the recoverable rotary spraying expansion head anchor cable comprises a rotary spraying drill bit 602, a locking recovery device 706, a recoverable anchor cable 8, a drill rod 601, a protective sleeve 708 and a prestress steel strand 707, wherein the anchor rod drill is connected with the locking recovery device 706 through the drill rod 601, the rotary spraying drill bit 602 is installed on the locking recovery device 706, the drill rod 601 and the rotary spraying drill bit 602 can rotate relative to the locking recovery device 706, the recoverable anchor cable 8 is installed on the periphery of the rotary spraying drill bit 602, namely, one end of the recoverable anchor cable 8 is locked on the locking recovery device 706, the other end of the recoverable anchor cable 8 is connected with one end of the prestress steel strand 707, the protective sleeve 708 is connected with the locking recovery device, and the other end of the prestress steel strand 707 penetrates through the protective sleeve 708 to protrude out of the pipe.
The rotary jetting drill 602 is used for high-pressure jetting and drilling of cement paste; the locking and recovering device 706 is used for locking and releasing the recoverable anchor cable 8; the drill rod 601 is used for driving and pushing and pulling a rotary jet drill head 602; the protective sleeve 708 is used for protecting the prestressed steel strand 707; the prestressed steel strands 707 are used to tension the recoverable anchor line 8.
As shown in fig. 1 to 4, the locking and recovering device comprises 1 pressure-bearing cover plate 1,1 pressure-bearing anchor plate 2,2 bolts 3, 4 locking structures 40, 4 releasing structures 41 and 1 rotating pressure bearing 5, each releasing structure 41 comprises a steel sleeve pipe 411, a spring 412, a positioning receiving block 413, a guiding connecting line 416, a guide pipe 414 and a lock catch 415, each locking structure 40 comprises an anchor guiding protective pipe 401, a pin steel wire 402, a connecting pipe 403 and an anchor clamping piece 404, and the bolts 3 comprise 2 nuts 302 and 1 fixing screw 301. The center of the pressure-bearing anchor plate 2 is provided with a through hole 201, 4 conical seat sleeves 202,4 recoverable anchor cables 8 are arranged around the through hole 201 and are respectively installed in the 4 conical seat sleeves 202 through anchor clamping pieces 404. The left end of the recoverable anchor rope 8 is connected with the right end of the positioning receiving block 413 through a guiding connecting wire 416, and two ends of the spring 412 are respectively connected with the right ends of the anchor sheet 404 and the positioning receiving block 413. The connecting pipe 403 is communicated with the conical seat sleeve 202 of the pressure-bearing anchor plate 2, and the right end of the recoverable anchor rope 8 protrudes from the right port of the connecting pipe 403 to be connected with the prestress steel strand 707. The left end of the pin steel wire 402 is clamped between the conical seat sleeve 202 and the anchor clamping piece 404, and the right end of the pin steel wire 402 sequentially passes through the connecting pipe 403, the anchor guiding protection pipe 401 and the protection sleeve 708, and the pin steel wire 402 protrudes to the outside. The anchor guiding and protecting pipe 401 is communicated with the narrow mouth end of the conical seat sleeve 202, the recoverable anchor rope 8, the connecting pipe 403 and the pin steel wire 402 are all located in the inner cavity of the anchor guiding and protecting pipe 401, 4 anchor guiding and protecting pipes 401 and the drill pipe 601 are all arranged in the protective sleeve 708, and the protective sleeve 708 is connected with the pressure bearing anchor plate 2. The wide mouth end of the conical seat sleeve 202 of the pressure bearing anchor plate 2 is communicated with the right end of the steel sleeve pipe 411. The center of the bearing plate 101 of the bearing cover plate 1 is provided with a through hole 103, 4 steel sleeve pipes 411,4 lock catches 415 are connected to the periphery of the through hole 103, are respectively arranged in the 4 steel sleeve pipes 411, and the 4 lock catches 415 are mounted on the bearing plate 101. The right end of the lock catch 415 is connected with a guide pipe 414, the guide pipe 414 is arranged on the inner wall of the steel sleeve pipe 411, the positioning receiving block 413 can move left and right in the guide pipe 414, and the left end of the positioning receiving block 413 can be inserted into the lock catch 415 to realize automatic locking. The rotary jet drill bit 602 sequentially penetrates through the through hole 201 of the pressure bearing anchor plate 2 and the through hole 103 of the pressure bearing cover plate 1, the rotary jet drill bit 602 is connected with the drill rod 601, and the joint of the rotary jet drill bit 602 and the drill rod 601 is arranged on the rotary pressure bearing 5. The rotary jet drill head 602 is provided with 2 high-pressure nozzles 6021,1, wherein the high-pressure nozzles 6021 are positioned on the left side of the pressure-bearing cover plate 1, the other 1 high-pressure nozzle 6021 is positioned between the pressure-bearing cover plate 1 and the pressure-bearing anchor plate 2, and the 2 high-pressure nozzles 6021 are oppositely arranged on the rotary jet drill head 602. The rotary pressure bearing 5 is mounted at the right end of the pressure-bearing anchor plate 2, and both the rotary jet drill head 602 and the drill rod 601 can rotate relative to the rotary pressure bearing 5. The through holes 201 of the pressure-bearing anchor plate 2 are provided with 2 screw holes 102 at peripherally symmetrical positions, the through holes 103 of the pressure-bearing cover plate 1 are also provided with 2 screw holes 102 at peripherally symmetrical positions, and two ends of each fixing screw 301 respectively penetrate through the 1 screw hole 102 of the pressure-bearing cover plate 1 and the 1 screw hole 102,2 nuts 302 of the pressure-bearing anchor plate 2 and are respectively arranged at two ends of the fixing screw 301.
The positioning receiving block 413 comprises a self-locking joint 4131, a guide cylinder 4132 and a connecting part 4133 which are sequentially connected, the self-locking joint 4131 and the lock catch 415 can be mutually matched to realize self locking, the guide cylinder 4132 is movably arranged on the inner wall of the guide tube 414, the connecting part 4133 is connected with the guide connecting wire 416, and the right end of the guide cylinder 4132 is connected with the spring 412.
The pressure-bearing cover plate 1 is used for supporting and fixing the rotary jet drill bit 602, so that the anchoring force is improved; the pressure-bearing anchor plate 2 is used for locking the recyclable anchor cable 8; the bolts 3 are used for fixedly connecting the pressure-bearing cover plate 1 and the pressure-bearing anchor plate 2; the locking structure 40 is used for locking the recyclable anchor cable 8; the release structure 41 is used for releasing the recoverable anchor line 8; the rotary pressure bearing 5 prevents the drill rod 601 and the rotary jet drill head 602 from driving the recoverable anchor rope 8 to twist when rotating; the steel sleeve pipe 411 serves to protect the internal components; spring 412 is used to connect clip anchor 404 and positioning receiver 413; the self-locking tab 4131 of the positioning receiver 413 is configured to lock with the latch 415; the guide cylinder 4132 cooperates with the guide tube 414 to realize the guide function and drive the anchor clamping piece 404 to separate from the conical seat sleeve 202; the guiding connecting line 416 is used for positioning the receiving block 413 to drive the recyclable anchor cable 8; the lock catch 415 cooperates with the self-locking joint 4131 to lock and prevent the anchor clip 404 from returning to the conical sleeve 202; the anchor guide and protection tube 401 is used for protecting the recyclable anchor cable 8; the pin steel wire 402 is used for filling a gap between the anchor clamping piece 404 and the conical seat sleeve 202, so that the locking force of the conical seat sleeve 202 on the recyclable anchor cable 8 is increased, and after the pin steel wire 402 is pulled out, the locking force of the conical seat sleeve 202 on the recyclable anchor cable 8 is reduced or eliminated; the connecting pipe 403 is used for protecting the shell to recover the anchor cable and the pin steel wire 402; the anchor clamping piece 404 is used for clamping the recyclable anchor cable 8; the bolts 3 are used for fixedly connecting the pressure-bearing cover plate 1 and the pressure-bearing anchor plate 2.
The working principle of the locking and recovering device is as follows:
1. the locking method of the recyclable anchor cable 8 comprises the following steps: when the recoverable anchor rope 8 passes through the conical seat sleeve 202 of the pressure-bearing anchor plate 2, the anchor clamping piece 404 is clamped on the recoverable anchor rope 8, the anchor clamping piece 404 is connected with the spring 412, and the positioning receiving block 413 is connected with the end part of the recoverable anchor rope 8 through the guide connecting line 416, namely the positioning receiving block 413 is positioned at the right end of the steel sleeve pipe 411. When the prestress steel strand 707 stretches, the prestress steel strand 707 drives the recoverable anchor rope 8 to stretch outwards from the conical seat sleeve 202 of the pressure-bearing anchor plate 2, the recoverable anchor rope 8 drives the anchor clamping piece 404 to lock and clamp with the conical seat sleeve 202, and the recoverable anchor rope 8 drives the positioning receiving block 413 to press the anchor clamping piece 404 to compress towards the conical seat sleeve 202 through the spring 412, so that locking of the recoverable anchor rope 8 is achieved.
2. The recycling method of the recyclable anchor cable 8 comprises the following steps: after the tensioning locking force of the prestress steel strand 707 is released, the pin steel wire 402 is pulled out of the conical seat sleeve 202 of the pressure-bearing anchor plate 2 and recovered by a jack, more gaps exist in the conical seat sleeve 202, the locking force of the anchor clamping piece 404 and the conical seat sleeve 202 on the recoverable anchor cable 8 is reduced or eliminated, the recoverable anchor cable 8 pushes the recoverable anchor cable 8 into the conical seat sleeve 202, the recoverable anchor cable 8 pushes the positioning receiving block 413 to move leftwards, the positioning receiving block 413 is locked with the lock catches 415, and meanwhile, the positioning receiving block 413 drives the anchor clamping piece 404 to be separated from the conical seat sleeve 202 through the spring 412. The recoverable anchor line 8 is then pulled outwardly from the conical sleeve 202, and the anchor clamping tabs 404 are secured to the receiving blocks, thereby allowing disengagement from the recoverable anchor line 8, and the recoverable anchor line 8 is pulled out of the conical sleeve 202, and finally the recoverable anchor line 8 is pulled out of the anchor guide tube 401, thereby completing recovery of the recoverable anchor line 8.
As shown in fig. 5-9, a construction method of a recoverable rotary-spraying expansion head anchor cable comprises the following steps:
s1, setting drilling positions in the foundation pit according to elevation and horizontal spacing required by design, and trimming a drilling machine working soil platform according to the drilling positions.
S2, selecting an anchor rod drilling machine according to actual requirements, installing the anchor rod drilling machine on a drilling machine working soil platform of the anchor rod drilling machine in the step S1, installing a rotary jet drill bit 602 on a drilling rod 601 of the anchor rod drilling machine, opening the anchor rod drilling machine, driving the rotary jet drill bit 602 to rotate by the anchor rod drilling machine, drilling soil body by the rotary jet drill bit 602, taking waste soil residues out of the holes by the rotary jet drill bit 602 and the drilling rod 601 until the rotary drill bit reaches the junction of the conventional anchoring section 702 and the enlarged head anchoring section 701, stopping drilling, and ensuring that the aperture and depth of the conventional anchoring section 702 meet design requirements to finish construction of the conventional anchoring section 702.
S3, starting a high-pressure pump to provide cement slurry for the rotary spraying drill bit 602, rotating the rotary spraying drill bit 602, carrying out high-pressure rotary spraying on the cement slurry from the rotary spraying drill bit 602, carrying out rotary spraying cutting on soil body by the cement slurry to form a large-diameter cement soil cylindrical pile body, and starting a grouting mode of the rotary spraying drill bit 602 to carry out grouting on the large-diameter cement soil cylindrical pile body to finish the construction of the enlarged head anchoring section 701.
S301, starting a high-pressure pump, conveying high-pressure spraying cement slurry to the rotary spraying drill bit 602 by the high-pressure pump, continuously drilling under the drive of the jumbolter, enabling the rotary spraying drill bit 602 to rotate at a constant speed and sink, spraying cement slurry from the rotary spraying drill bit 602 at high pressure, expanding the aperture of the drilled hole by the cement slurry, and cutting, replacing, stirring, penetrating and extruding the soil body by the cement slurry at high pressure to form a large-diameter cement soil cylindrical pile body. The cement paste adopts silicate cement with the strength not lower than 42.5. After the length of the large-diameter cement soil cylindrical pile body exceeds the design length by at least 0.5m, the rotary jetting drill bit 602 stops rotating, and the cement slurry stops high-pressure jetting.
S302, pulling the drill rod 601 out of the drill hole, when the rotary jet drill bit 602 reaches the junction of the conventional anchoring section and the enlarged head anchoring section 701, starting a high-pressure pump, enabling the rotary jet drill bit not to rotate, enabling cement slurry to be ejected from the rotary jet drill bit 602 under high pressure, enabling the rotary jet drill bit 602 to move from bottom to top in the enlarged head anchoring section 701, and constructing the enlarged head anchoring section 701.
S4, pulling out the drill rod 601 and the rotary spraying drill bit 602 from the drill hole, after the recoverable anchor rope 8 is accepted in site, detaching the rotary spraying drill bit 602 from the drill rod 601, installing the rotary spraying drill bit 602 on the locking and recovering device, locking the recoverable anchor rope 8 on the locking structure 40 of the locking and recovering device 706, connecting the locking and recovering device 706 with the drill rod 601, pushing the rotary spraying drill bit 602 and the recoverable anchor rope 8 to the bottom of the enlarged head anchoring section 701 through the drill rod 601, and ensuring the recoverable anchor rope 8 to be straight in the process.
S5, performing secondary high-pressure jet grouting on the enlarged head anchoring section 701, so that the strength and density of cement paste of an anchoring body can be ensured. After the rotary spraying drill bit 602 is pushed to the enlarged head anchoring section 701 by adopting the jumbolter, the high-pressure pump is started, the high-pressure pump conveys cement slurry to the rotary spraying drill bit 602, the rotary spraying drill bit 602 is driven by the jumbolter to rotate, the cement slurry is sprayed out from the rotary spraying drill bit 602 in a high-pressure rotary manner, the cement slurry is subjected to rotary spraying cutting on the soil body, the diameter of the enlarged head anchoring section 701 is far greater than the original diameter, the cement slurry is filled in the enlarged head anchoring section 701 after the diameter is enlarged, and the locking and recycling device 706 and the cement slurry around the enlarged head anchoring section 701 form cement consolidation slurry, so that secondary slurry supplementing of the enlarged head anchoring section 701 is completed. The secondary slurry filling is beneficial to improving the connection compactness, strength and stability of the locking and recovering device 706 and the enlarged head anchoring section 701. The expansion head anchoring section 701 with larger aperture and controllable can be formed by adjusting the speed of the drill rod 601 and the pressure of the high-pressure pump, the friction force formed by the expansion head anchoring section 701 and a rock-soil body and the end bearing force of the expansion head anchoring section 701 and the locking and recovering device are obviously improved, and the large-tonnage pulling resistance can be provided for the recoverable anchor cable 8.
And S6, after the secondary fluid infusion of the enlarged head anchoring section 701 is completed, 4 prestressed steel strands 707 are tensioned in the tensioning section 704, and the prestressed steel strands 707 drive the recoverable anchor cable 8 to be tensioned and locked. The prestress steel strands 707 of the same recyclable anchor cable 8 are required to be synchronously performed, so that the prestress steel strands 707 are ensured to be accepted uniformly, and the recyclable anchor cable 8 is prevented from being damaged due to overlarge local stress and mutual influence; thus, after two tensioning operations, the recoverable anchor line 8 is locked by the anchor clamps 404 and the conical sleeve 202; step S6 includes the steps of:
s601, tensioning each prestress steel strand for the first time according to the design tensioning force of 30% of the prestress steel strand 707;
s602, the whole prestress steel strand 707 is tensioned for the second time according to the designed tensioning force of the recyclable anchor cable 8, the recyclable anchor cable 8 drives the positioning receiving block 413 to approach the conical seat cover 202 through the guide connecting line 416, the positioning receiving block 413 pushes the spring 412 to press the anchor clamping piece 404, the anchor clamping piece 404 is pressed into the conical seat cover 202, and meanwhile the recyclable anchor cable 8 drives the anchor clamping piece 404 to press the conical seat cover 202 to lock.
S7, releasing and recycling the recyclable anchor cable 8 from the locking and recycling device. Step S7 includes the steps of:
s701, pulling out and recovering the pin steel wire 402 from between the conical seat cover 202 and the anchor clamping piece 404 by adopting a jack, and after the pin steel wire 402 is pulled out, leaving a larger space between the anchor clamping piece 404 and the conical seat cover 202, so that the locking force of the anchor clamping piece 404 to the recoverable anchor rope 8 is reduced or eliminated; the retractable cord 8 is pushed by the spring 412;
s702, recoverable anchor rope 8 can easily rotate, recoverable anchor rope 8 and bulldoze in to conical seat cover 202, recoverable anchor rope 8 is close to hasp 415 through the locating receiving piece 413 of spring 412 promotion, locating receiving piece 413 with self-locking joint 4131 and hasp 415 fixed connection, simultaneously locating receiving piece 413 drives through spring 412 and presss from both sides anchor piece 404 and break away from conical seat cover 202, recoverable anchor rope 8 no longer receives the lock of clamp anchor piece 404 and conical seat cover 202, recoverable anchor rope 8 outwards dials out, clamp anchor piece 404 breaks away from recoverable anchor rope 8 under the pulling of locating receiving piece 413, the guide connecting wire 416 disconnection between locating receiving piece 413 and the recoverable anchor rope 8, recoverable anchor rope 8 breaks away from pressure-bearing anchor plate 2, recoverable anchor rope 8 is easily pulled out from leading anchor protection pipe 401, thereby realize recoverable anchor rope 8' S recovery.
The above embodiments are preferred examples of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions made without departing from the technical aspects of the present invention are included in the scope of the present invention.
Claims (9)
1. The utility model provides a recoverable rotary spraying enlarged head anchor rope, its characterized in that includes rotary spraying drill bit, lock solid recovery unit, recoverable anchor rope, drilling rod, protective sleeve and prestressing force stranded conductor, lock solid recovery unit includes pressure-bearing cover plate, pressure-bearing anchor plate, bolt, lock solid structure, release structure and rotation pressure bearing, rotary spraying drill bit pass through the rotation pressure bearing install in pressure-bearing anchor plate, rotary spraying drill bit's one end passes in proper order pressure-bearing anchor plate with pressure-bearing anchor plate, rotary spraying drill bit's the other end with the drilling rod is connected, recoverable anchor rope passes through lock solid structure's one end install in pressure-bearing anchor plate, release structure's one end respectively with recoverable anchor rope's one end with lock solid structure connects, release structure's the other end with prestressing force stranded conductor's one end is connected, protective sleeve's one end with pressure-bearing anchor plate connects, prestressing force stranded conductor's the other end with lock solid structure's the other end all goes out in protective sleeve's the other end, pressure-bearing anchor plate passes through the pressure-bearing anchor plate and connects.
2. The recoverable rotary jetting expansion head anchor cable according to claim 1, wherein the release structure comprises a steel sleeve pipe, a spring, a positioning receiving block, a guide pipe and a lock catch, two ends of the steel sleeve pipe are respectively connected with the pressure-bearing cover plate and the pressure-bearing anchor plate, the positioning receiving block is mounted on the inner wall of the steel sleeve pipe through the guide pipe, the guide pipe is mounted on the pressure-bearing cover plate through the lock catch, one end of the positioning receiving block is matched with the lock catch, the other end of the positioning receiving block is connected with one end of the recoverable anchor cable through a guide connecting wire, and the other end of the positioning receiving block is connected with the locking structure through the spring.
3. The recoverable rotary jetting expansion head anchor cable according to claim 2, wherein the positioning receiving block comprises a self-locking joint, a guiding cylinder and a connecting part which are sequentially connected, the self-locking joint is matched with the lock catch, the guiding cylinder is movably arranged on the guide pipe, the connecting part is connected with the guiding connecting wire, and the guiding cylinder is connected with the spring.
4. The recoverable rotary jetting expansion head anchor rope according to claim 1, wherein the locking structure comprises an anchor guiding protection pipe, a pin steel wire, a connecting pipe and an anchor clamping piece, the pressure bearing anchor plate is provided with a plurality of conical seat sleeves, the conical seat sleeves are distributed around the rotary jetting drill bit, the recoverable anchor rope is installed on the conical seat sleeves through the anchor clamping piece, the connecting pipe is communicated with the conical seat sleeves, the connecting pipe is installed on the anchor guiding protection pipe, the anchor guiding protection pipe is installed on the protection sleeve, the other end of the recoverable anchor rope penetrates through the connecting pipe to be connected with one end of the prestress steel wire, one end of the pin steel wire is clamped between the conical seat sleeves and the anchor clamping piece, and the other end of the pin steel wire penetrates through the connecting pipe, the anchor guiding protection pipe and the protection sleeve in sequence.
5. The recoverable rotary jetting expansion head anchor cable of claim 1, wherein said rotary jetting drill is provided with two high pressure nozzles, one of said high pressure nozzles being located on a side of said pressure bearing cover plate remote from said pressure bearing anchor plate, and the other of said high pressure nozzles being located between said pressure bearing cover plate and said pressure bearing anchor plate.
6. The recoverable rotary jetting expansion head anchor cable according to claim 1, wherein the bolt comprises a nut and a fixing screw, one end of the fixing screw penetrates through the pressure-bearing cover plate to be connected with one nut, and the other end of the fixing screw penetrates through the pressure-bearing anchor plate to be connected with the other nut.
7. The construction method of the recoverable rotary jetting expansion head anchor cable according to any one of claims 1 to 6, comprising the following steps:
s1, setting drilling positions in a foundation pit according to elevation and horizontal spacing required by design, and trimming a drilling machine working soil platform according to the drilling positions;
s2, installing an anchor rod drilling machine on the drilling machine working soil platform in the step S1, installing a rotary jet drill bit on a drill rod of the anchor rod drilling machine, and drilling holes by aiming at the drilling holes by the rotary jet drill bit until the rotary drill bit reaches the junction of the conventional anchoring section and the enlarged head anchoring section, and stopping drilling holes to finish the construction of the conventional anchoring section;
s3, starting a high-pressure pump to provide cement slurry for the rotary spraying drill bit, starting the rotary spraying drill bit to rotate, performing rotary spraying cutting on soil body by the cement slurry to form a large-diameter cement soil cylindrical pile body, and starting a grouting mode of the rotary spraying drill bit to perform grouting on the large-diameter cement soil cylindrical pile body to finish construction of an enlarged head anchoring section;
s4, pulling the drill rod and the rotary spraying drill bit out of the drill hole, then detaching the rotary spraying drill bit from the drill rod, installing the rotary spraying drill bit and the recoverable anchor cable on a locking recovery device, and installing the locking recovery device on the drill rod;
s5, pushing the cement slurry to the enlarged head anchoring section by adopting a rotary jet drill bit, starting a high-pressure pump, conveying the cement slurry to the rotary jet drill bit by the high-pressure pump, starting the rotary jet drill bit to rotate, carrying out rotary jet cutting on soil body by cement, increasing the diameter of the enlarged head anchoring section, and simultaneously filling the cement slurry in the enlarged head anchoring section to complete secondary slurry supplementing of the enlarged head anchoring section;
s6, tensioning the prestressed steel strand in a tensioning section, wherein the prestressed steel strand drives the recoverable anchor cable to be tensioned, and the recoverable anchor cable is locked by the anchor clamping piece and the conical seat sleeve;
s7, recycling the recyclable anchor cable from the locking recycling device.
8. The construction method according to claim 7, wherein step S6 includes the steps of:
s601, tensioning each prestress steel strand for the first time according to the design tensioning force of 30% of the prestress steel strands;
s602, tensioning the whole prestress steel strand for the second time according to the design tensioning force of the recyclable anchor cable, wherein the recyclable anchor cable drives the positioning receiving block to approach the conical seat sleeve through the guide connecting wire, the positioning receiving block compresses the anchor clamping piece through the spring, and meanwhile the recyclable anchor cable drives the anchor clamping piece to compress the conical seat sleeve for locking.
9. The construction method according to claim 7, wherein step S7 includes the steps of:
s701, pulling out the pin steel wire from between the conical seat sleeve and the anchor clamping piece by adopting a jack, wherein the locking force of the anchor clamping piece and the conical seat sleeve on the recyclable anchor cable is reduced or eliminated;
s702, the anchor cable is rotated and pushed into the conical seat sleeve, the anchor cable pushes the positioning receiving block to approach the lock catch through the spring, the self-locking connector of the positioning receiving block is automatically connected with the lock catch, meanwhile, the spring drives the anchor clamping piece to separate from the conical seat sleeve, the recyclable anchor cable is pulled outwards from the conical seat sleeve, and the recyclable anchor cable is separated from the anchor clamping piece, the conical seat sleeve and the anchor guiding protection tube in sequence, so that recycling of the recyclable anchor cable is completed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310339417.XA CN116479899A (en) | 2023-03-31 | 2023-03-31 | Recoverable rotary-spraying enlarged-head anchor cable and construction method |
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| CN202310339417.XA CN116479899A (en) | 2023-03-31 | 2023-03-31 | Recoverable rotary-spraying enlarged-head anchor cable and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117248526A (en) * | 2023-10-09 | 2023-12-19 | 中铁广州工程局集团深圳工程有限公司 | Enlarged head anchor cable with dual functions of hole guiding and guniting and construction method thereof |
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- 2023-03-31 CN CN202310339417.XA patent/CN116479899A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117248526A (en) * | 2023-10-09 | 2023-12-19 | 中铁广州工程局集团深圳工程有限公司 | Enlarged head anchor cable with dual functions of hole guiding and guniting and construction method thereof |
| CN117248526B (en) * | 2023-10-09 | 2024-05-07 | 中铁广州工程局集团深圳工程有限公司 | Enlarged head anchor cable with dual functions of hole guiding and guniting and construction method thereof |
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