CN115652922B - Recyclable anchoring components for precast concrete bottom anchor heads - Google Patents
Recyclable anchoring components for precast concrete bottom anchor heads Download PDFInfo
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- CN115652922B CN115652922B CN202210600871.1A CN202210600871A CN115652922B CN 115652922 B CN115652922 B CN 115652922B CN 202210600871 A CN202210600871 A CN 202210600871A CN 115652922 B CN115652922 B CN 115652922B
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- anchor head
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Abstract
The invention discloses a recoverable anchor assembly of a prefabricated concrete bottom anchor head, which comprises an anchor rope, a pulling pin and a bottom anchor head, wherein the bottom anchor head comprises an anchor head body formed by casting concrete and an internal thread anchor which is embedded in the anchor head body and is provided with internal threads, a connecting section is fixedly connected with the bottom end of the anchor rope, the connecting section is matched with the internal thread anchor through threads, the rising angle of the threads is larger than a self-locking angle, the pulling pin is inserted into the connecting section along the length direction and locked with the internal thread anchor in the circumferential direction, and can be pulled out to disengage and release the internal thread anchor.
Description
Technical Field
The invention relates to construction anchoring equipment, in particular to a recyclable anchoring assembly of a prefabricated concrete bottom anchor head.
Background
Temporary support is a common safety protection measure in building construction, and is realized by anchoring anchor cables. Because the anchor cable is temporarily supported, the anchor cable cannot be recovered after the support function fails in common practice, and is buried underground together with a structure to form underground garbage, so that underground environment pollution is caused, and serious influence is caused on construction of adjacent land blocks, long-distance planning and sustainable development of cities.
In order to solve the above problems, in the prior art, a recoverable anchor rope appears, and a connecting piece and an anchoring piece of an anchoring section of the recoverable anchor rope can be connected and separated in various manners, and the connecting manner is generally in detachable connection, namely in threaded connection or turnbuckle connection, and the anchor rope is separated from the threaded connection or the turnbuckle structure by applying a rotating force to the anchor rope when the anchor rope is recovered, and is pulled out by external force, so that the recovery of the anchor rope is completed.
During practical construction, the bottom end of the anchor cable is connected with the anchoring head through threads, and the anchoring is realized by applying prestressing force in the later period, so that the lead angle of the threads is far smaller than the self-locking angle, otherwise, the threads are separated under the action of circumferential component force, and the anchoring cannot be realized. After the structure of threaded connection is anchored underground, rust may occur in the anchoring environment and the anchor cable cannot be rotated during recycling, and the applied external force transmits torsion moment to the bottom, so that the requirement on the anchor cable is high, and the cost is increased.
Meanwhile, the anchor heads are generally formed by adopting steel structures, two ends of each anchor disc are commonly used, the anchor discs are connected through bolts, an internal thread anchor is pressed in the middle of each anchor disc, the anchor discs and the anchor bodies are poured into a whole after entering the bottom ends of anchor holes, and in the construction process, the anchor heads are not easy to be poured thoroughly when the anchor bodies are poured (particularly in a high-pressure rotary spraying process), so that the bearing capacity of the anchor heads cannot be fully exerted.
Therefore, the existing recyclable anchor cable structure needs to be improved, the anchor head and the anchoring body are integrated completely and tightly, the bearing capacity is guaranteed, the anchor cable recycling operation is simple and convenient, foundation pit support is firm during anchoring, the requirement for transmitting torsion moment to the anchor cable is not high, and finally the purposes of reducing the construction cost and improving the construction efficiency are achieved.
Disclosure of Invention
In view of the above, the invention aims to provide a recoverable anchor assembly of a prefabricated concrete bottom anchor head, the anchor head and an anchor body are integrated completely and tightly, the bearing capacity is ensured, the recovery operation of an anchor cable is simple and convenient, the foundation pit is firmly supported during anchoring, the requirement on the transmission of torsion moment of the anchor cable is not high, and finally the purposes of reducing the construction cost and improving the construction efficiency are achieved.
The invention discloses a recoverable anchor assembly of a prefabricated concrete bottom anchor head, which comprises an anchor rope, a pull pin and a bottom anchor head, wherein the bottom anchor head comprises an anchor head body formed by casting concrete and an internal thread anchor device which is embedded in the anchor head body and is provided with an internal thread, the bottom end of the anchor rope is fixedly connected with a connecting section, the connecting section is matched with the internal thread anchor device through threads, and the rising angle of the threads is larger than a self-locking angle;
the pulling pin is inserted into the connecting section along the length direction and locked in the circumferential direction, and can be pulled out to be separated from the female screw anchor and released.
Further, the anchor head body comprises a steel structure framework and cylindrical concrete poured on the steel structure framework, and the internal thread anchorage is welded on the steel structure framework.
Further, the columnar concrete is provided with a plurality of shear nails in an outward extending mode, and the shear nails are welded on the steel structure framework or formed by integrally extending the steel structure framework outwards.
Further, the cross section of pull out the round pin is the polygon, the internal thread ground tackle is equipped with the internal thread that is used for being connected with the linkage segment, and the bottom of internal thread forms and pulls out round pin complex polygon hole, the linkage segment be equipped with be used for with pull out round pin complex polygon hole.
Further, the connecting section is further provided with an operation hole for placing and taking out the pulling pin, a pulling wire is arranged along with the anchor cable, one end of the pulling wire penetrates through the operation hole to be fixedly connected with the pulling pin, and the other end of the pulling wire is exposed out of the outer anchor head during anchoring.
Further, the anchor cable is sleeved with an isolation tube, and the stay wire is positioned in the isolation tube.
Further, the bottom end of the isolation tube forms a seal with the anchor head body.
Further, the connecting section is of a hollow structure, a steering block is fixedly arranged in the hollow structure, the steering block is provided with a through hole which is opposite to the pulling pin in the length direction, and the pulling wire penetrates through the through hole of the steering block and is connected with the pulling pin.
Further, the shear pin is of a transverse plate-shaped structure.
The recyclable anchor assembly for the precast concrete bottom anchor head has the beneficial effects that the recyclable anchor assembly for the precast concrete bottom anchor head adopts a precast concrete anchor head structure, is firm and thorough in pouring and combination with an anchor body, avoids the occurrence of an overhead condition, thereby ensuring the bearing capacity after anchoring, simultaneously adopts large-lift-angle threaded connection and combines the locking function of the pulling pin in the circumferential direction, the pulling pin is pulled out from the anchor cable during recycling, the recycling operation of the anchor cable is simple and convenient, the construction efficiency is improved, the foundation pit support is firm during anchoring, and the requirement on the transmission of torsion moment by the anchor cable is not high, so that the purposes of reducing the construction cost and improving the construction efficiency are finally achieved.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view at A of FIG. 1;
FIG. 3 is a cross-sectional view of the bottom anchor head;
Fig. 4 is a schematic view of a support structure formed by the present invention.
Detailed Description
1-4, The recyclable anchor assembly of the prefabricated concrete bottom anchor head of the embodiment comprises an anchor rope 3, a pulling pin 7 and a bottom anchor head 4, wherein the bottom anchor head 4 comprises an anchor head body formed by concrete pouring and an internal thread anchor 403 which is embedded in the anchor head body and is provided with internal threads, the bottom end of the anchor rope 3 is fixedly connected with a connecting section 301, the connecting section 301 is matched with the internal thread anchor 403 through threads, and the lifting angle of the threads is larger than a self-locking angle;
The pull pin 7 is inserted into the connecting section 301 and the internal thread anchor 403 along the length direction and locked in the circumferential direction, the pull pin 7 can be pulled out and separated from the internal thread anchor 403, when anchoring, the pull pin 7 is inserted into the connecting section 301 and the internal thread anchor 403 to ensure that the connecting section 301 and the internal thread anchor 403 are locked in the circumferential direction, the thread pair bears and cannot be separated when stretching force in the length direction is applied, when the anchor cable 3 needs to be recovered, the pull pin 7 is pulled out of the internal thread anchor 403, the relative freedom degree between the connecting section 301 and the internal thread anchor 403 in the circumferential direction is released, the anchor cable 3 is directly separated from the internal thread anchor under the prestress due to the fact that the thread lift angle is larger than the self-locking angle, and recovery is completed after the external force is pulled out, in the structure, the lift angle can be far larger than the self-locking angle due to the locking function of the pull pin, and the anchor cable can be conveniently pulled out after the release of the lock of the pull pin;
The bottom anchor head of the embodiment is formed by casting concrete, so that the problem of casting failure is avoided when the bottom anchor head enters an anchoring body and is combined with the anchoring body, the binding force is increased, the anchoring quality is ensured, meanwhile, the internal thread anchor is embedded in the concrete to realize a recoverable anchor rope structure, steel materials are less in the whole structure, the cost is saved, and the pollution to the environment is reduced.
In this embodiment, the anchor head body includes a steel structure skeleton 402 and a cylindrical concrete 401 poured on the steel structure skeleton, and the internal thread anchor 403 is welded on the steel structure skeleton, so that the overall tensile strength of the anchor head body is ensured, and the anchor head body is used for supporting the internal thread anchor.
In this embodiment, the cylindrical concrete 401 is provided with a plurality of shear nails 404 extending outwards, and the shear nails 404 are welded to the steel structure skeleton or formed by integrally extending outwards from the steel structure skeleton 402, and generally adopt an integrally formed structure; in the structure, the anchoring body is only required to be combined with shear nails of the outer circle of cylindrical concrete, the problem of overhead does not exist, the shear nails are finally used for being poured in the anchoring body, good combination of the anchor head body and the anchoring body is guaranteed, the anchoring strength is guaranteed, the shear nails are provided with nail caps, the pulling resistance and the shearing resistance of the anchoring structure after pouring molding are improved, as shown in the figure, the steel skeleton comprises annular steel rings and radial rods which are distributed radially, the three internally threaded anchors are evenly distributed in the circumferential direction and are vertical steel pieces at the same time, the annular steel rings are two inner sides and outer sides of the internally threaded anchors respectively and are welded with the two internally threaded anchors, the radial rods extend out of the concrete column in the radial direction and form the shear nails, and the radially inner sides and the outer sides refer to the radial directions of the concrete column.
In this embodiment, the cross section of the pin 7 is polygonal, the internal thread anchor is provided with an internal thread for connecting with a connecting section, the bottom of the internal thread forms a polygonal hole 4031 matched with the pin, the connecting section is provided with a polygonal hole matched with the pin, as shown in the figure, grease is smeared on the pin and a thread pair when the pin and the thread pair are used, so that the pin is pulled out smoothly in the later stage, and the polygonal structure ensures that the pin is reliably transferred, has more stress surfaces and has better bearing capacity.
In this embodiment, the connection section 301 is further provided with an operation hole 3011 for placing and taking out the pull pin, and the pull wire 8 is provided along with the anchor cable 3, where the pull wire 8 is generally a steel wire or a thin steel strand; when the bottom anchor head 4 and the anchor cable 3 are implanted, as shown in the figure, the connecting section 301 is connected with the internal thread anchor 403 in a threaded manner, the operating hole is used for placing the pulling pin into the internal thread anchor and downwards extending into the internal thread anchor to form a circumferential fixed state, the connecting section is of a hollow structure and is used for placing or taking out the pulling pin through the operating hole, a steering block is fixedly arranged in the hollow structure, the steering block 3012 is provided with a through hole which is opposite to the pulling pin in the length direction, and the pulling wire 8 passes through the through hole of the steering block 3012 and is connected with the pulling pin 7, so that the pulling force of the pulling wire 8 directly acts on the pulling pin 7 in the length direction, and the pulling of the pulling pin is convenient;
the anchor cable 3 is sleeved with the isolation tube 9, the isolation tube 9 is generally a PE tube, the pull wire 7 is positioned in the isolation tube 9, the isolation tube 9 is sleeved on the anchor cable 3 after the pulling pin is placed, the bottom end of the isolation tube is connected with the bottom anchor head 4 to form a seal, and the form of sealing and gluing and the like can be adopted to ensure that the anchor cable cannot be polluted or is poured by an anchoring body, so that the later recovery process is smoothly carried out.
In the embodiment, the shear pin is of a transverse plate structure, wherein the transverse plate structure is a plate structure perpendicular to a plane in the length direction, and the shear pin (comprising a pin cap) of the structure can increase the contact area with the anchoring body in the pulling-resistant direction, so that the bearing capacity is increased.
As shown in fig. 4, when the invention is used for anchoring, a cast-in-place pile 1 and a waterproof curtain 2 are cast around a foundation pit, the cast-in-place pile is cast with a crown beam and a waist beam, and the anchoring component of the invention is anchored through the crown beam and the waist beam;
After anchoring, the bottom anchor head 4 is anchored in the anchor body 5, and the bottom end of the anchor body 5 forms an enlarged end 6 to increase the anchoring strength;
Before backfilling earthwork, the pull wire is controlled to pull out the pulling pin from the internal thread anchor, the connecting section is separated from the internal thread anchor by utilizing the prestress of the anchor cable and the thread angle between the connecting section and the internal thread anchor being larger than the self-locking angle, and the anchor cable is pulled out after external force is applied;
As shown in the figure, the stay wire is accompanied with the anchor cable and extends out of a stay wire hole arranged on the external anchor head, and when the pulling pin is required to be pulled out, the anchor cable can be recovered by external force;
Or before backfilling earthwork, after the outer anchor head is disassembled to release the anchor cable, the pull wire is controlled to pull out the pull pin from the internal thread anchor, and the anchor cable is pulled out after external force is applied, so that the aim of the invention can be realized.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (9)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210600871.1A CN115652922B (en) | 2022-05-30 | 2022-05-30 | Recyclable anchoring components for precast concrete bottom anchor heads |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210600871.1A CN115652922B (en) | 2022-05-30 | 2022-05-30 | Recyclable anchoring components for precast concrete bottom anchor heads |
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| CN115652922A CN115652922A (en) | 2023-01-31 |
| CN115652922B true CN115652922B (en) | 2025-05-27 |
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| CN202210600871.1A Active CN115652922B (en) | 2022-05-30 | 2022-05-30 | Recyclable anchoring components for precast concrete bottom anchor heads |
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| CN115419076B (en) * | 2022-05-30 | 2024-06-25 | 中冶建工集团有限公司 | High-pressure rotary spraying recyclable anchor cable supporting construction method for deep foundation pit |
| CN115652940B (en) * | 2022-05-30 | 2025-06-27 | 中冶建工集团有限公司 | Anchoring components for retrievable anchor cables |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN217923554U (en) * | 2022-05-30 | 2022-11-29 | 中冶建工集团有限公司 | Prefabricated concrete bottom anchor head for recoverable anchor cable |
| CN115652940A (en) * | 2022-05-30 | 2023-01-31 | 中冶建工集团有限公司 | Anchor components for retrievable anchor cables |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3535320A1 (en) * | 1985-10-03 | 1987-04-09 | Dyckerhoff & Widmann Ag | METHOD AND DEVICE FOR SETTING A ROD, WIRE OR TUBULAR INSTALLATION COMPONENT IN A FLOOR INFORMATION WITH PRESSING WATER |
| JP2005113585A (en) * | 2003-10-09 | 2005-04-28 | Kankyo Kogaku Kk | Anchor pin, unit for civil engineering structure and use of anchor pin |
| CN109339839B (en) * | 2018-09-30 | 2020-07-07 | 中国科学院武汉岩土力学研究所 | Recyclable sand consolidation anchor head prestressed bolt, anchoring jack and application method thereof |
| CN109972613B (en) * | 2019-04-28 | 2024-02-23 | 中冶沈勘工程技术有限公司 | Recyclable anchoring mechanism and construction method |
| KR102267289B1 (en) * | 2020-09-09 | 2021-06-18 | 이태곤 | Head-Fixed Retaining Wall and Construction Method Thereof |
| CN114517562B (en) * | 2020-11-20 | 2024-07-09 | 林恕如 | Reinforcing steel bar anchoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN217923554U (en) * | 2022-05-30 | 2022-11-29 | 中冶建工集团有限公司 | Prefabricated concrete bottom anchor head for recoverable anchor cable |
| CN115652940A (en) * | 2022-05-30 | 2023-01-31 | 中冶建工集团有限公司 | Anchor components for retrievable anchor cables |
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