CN114991839A - Pipe jacking type deformation assembly for anchor cable and anchor rod and application method thereof - Google Patents
Pipe jacking type deformation assembly for anchor cable and anchor rod and application method thereof Download PDFInfo
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- CN114991839A CN114991839A CN202210640774.5A CN202210640774A CN114991839A CN 114991839 A CN114991839 A CN 114991839A CN 202210640774 A CN202210640774 A CN 202210640774A CN 114991839 A CN114991839 A CN 114991839A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000011435 rock Substances 0.000 claims abstract description 40
- 230000008602 contraction Effects 0.000 claims abstract description 35
- 230000000452 restraining effect Effects 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 239000011247 coating layer Substances 0.000 claims description 8
- 239000011378 shotcrete Substances 0.000 claims description 7
- 238000004873 anchoring Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009545 invasion Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 OR ROCK 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
- E21D21/006—Anchoring-bolts made of cables or wires
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D21/0086—Bearing plates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D21/0093—Accessories
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a pipe-jacking type deformation assembly for an anchor rope and an anchor rod and an application method thereof, wherein the pipe-jacking type deformation assembly comprises a restraining ring and a contraction pipe; the restraining ring is of an annular structure, and the inner diameter of the restraining ring is gradually reduced from the outer side to the inner side; the contraction pipe is a hollow pipe, the outer diameter of the main body is larger than the minimum inner diameter of the restraint ring, and the radial rigidity of the contraction pipe is smaller than that of the restraint ring; when the restraint ring and the shrinkage pipe are coaxially and mutually extruded, the radial deformation of the restraint ring is small, and the shrinkage pipe generates obvious radial shrinkage deformation, so that the outer diameter of the main body of the shrinkage pipe is equal to the minimum inner diameter of the restraint ring, and the restraint ring and the shrinkage pipe generate relative slippage; the maximum sliding deformation is the deformation capacity of the pipe-jacking type deformation assembly. The invention can effectively realize stable high-strength constant-resistance yielding, has simple structure and low manufacturing cost, and does not need reaming construction; the deformation of the anchor cable or the anchor rod can be observed in real time, and the deformation of the rock mass can be calculated, so that the danger is pre-warned.
Description
Technical Field
The invention belongs to the field of geotechnical engineering reinforcement, and particularly relates to a pipe-jacking type deformation assembly for an anchor cable and an anchor rod and an application method thereof.
Background
Anchor cables and anchor rods are commonly used supporting equipment in the projects of mines, tunnels, water conservancy and hydropower and the like. Under the conditions of overlarge rock mass deformation, rock burst or earthquake and the like, the traditional anchoring structure allows less deformation and is easy to damage, so that the instability and damage accidents of underground engineering are caused. Therefore, the scholars have proposed a plurality of large deformation anchor cables and bolts, which can bear large deformation and provide high support resistance.
The existing large-deformation anchor cable has the problems of complex structure, high cost and difficulty in applying prestress. Patent CN215256268U that this application inventor provided utilizes the plastic deformation of metal to provide the stable support resistance and the yielding deformation of big deformation anchor rope, but its installation in-process needs reaming in the rock mass, and the construction degree of difficulty is great, and self structure is complicated moreover, and preparation and application cost are all higher.
Disclosure of Invention
In view of this, the invention aims to provide a pipe jacking type deformation assembly for anchor cables and anchor rods and an application method thereof, which solve the problems of complex structure, high reaming construction difficulty and high cost of the existing device.
The invention is realized by adopting the following scheme: a pipe-jacking type deformation assembly for anchor cables and anchor rods comprises a restraining ring and a contraction pipe; the whole assembly is arranged on the outer side of a rock body, the anchor cable tray or the anchor rod tray is abutted against the rock body corresponding to the anchor hole, the inner side of the restraint ring is abutted against the outer side of the tray corresponding to the anchor hole, and the inner end of the shrinkage pipe is inserted into the restraint ring corresponding to the anchor hole; the outer end of the anchor cable steel strand or the anchor rod body sequentially penetrates through the tray, the restraint ring and the contraction pipe, and an anchor cable anchorage device or an anchor rod nut is connected to the outer side;
the restriction ring is of an annular structure, the inner diameter of the restriction ring is gradually reduced from the outer side to the inner side, and after the restriction ring is reduced to the minimum inner diameter, the inner diameter is kept unchanged or slightly enlarged;
the outer diameter of the main body of the contraction pipe is larger than the minimum inner diameter of the restraint ring, and the radial rigidity of the contraction pipe is smaller than that of the restraint ring;
when the restraint ring and the shrinkage pipe are coaxially and mutually extruded, the radial deformation of the restraint ring is small, the shrinkage pipe generates obvious radial shrinkage deformation, the outer diameter of the main body of the shrinkage pipe is equal to the minimum inner diameter of the restraint ring, and meanwhile, the restraint ring and the shrinkage pipe generate relative sliding;
after the inner end of the shrinkage pipe is inserted into the constraint ring, the shrinkage pipe still has a certain length outside the constraint ring, and the length is the maximum relative slippage between the shrinkage pipe and the constraint ring and is also the maximum deformability of the pipe-jacking type deformation assembly.
Furthermore, the inner end of the shrinkage pipe is provided with a necking, so that the inner end of the shrinkage pipe can be conveniently inserted into the restraint ring, and the problem that the center lines of the shrinkage pipe and the restraint ring are not coaxial can be prevented.
Furthermore, the shrinkage of the cross section of the shrinkage pipe is between 1% and 36% in the process of passing through the restraint ring, the bearing capacity cannot be fully exerted if the shrinkage of the cross section is too small, and the crushing stress of the shrinkage pipe is unstable if the shrinkage of the cross section is too large; the cross-sectional shrinkage rate is the percentage of the reduction of the cross-sectional area of the shrinkage pipe to the original cross-sectional area.
Furthermore, the restraint ring and the tray are integrally formed; the restraint ring and the tray are combined into a whole, or the periphery of the restraint ring is increased to enable the restraint ring to have the function of restraining the rock mass by the tray, so that the number of components can be reduced.
Furthermore, the outer surface of the shrinkage pipe and the inner surface of the restraint ring are coated with lubricating materials, so that the contact relationship between the shrinkage pipe and the restraint ring can be improved, and the resistance force generated when slippage occurs between the shrinkage pipe and the restraint ring is more stable.
Furthermore, the outer surface of the shrinkage pipe is provided with a soft coating layer, the outer diameter of the soft coating layer is equal to or larger than that of the anchorage device or the nut, and the sprayed concrete in the later construction period of the anchorage device or the nut in the deformation process of the assembly is prevented.
Furthermore, the outer surface of the contraction pipe is provided with scale marks and/or annular color marks; the relative slippage between the shrinkage pipe and the restraint ring can be observed conveniently, and therefore the deformation degree of the rock body can be identified.
An application method of a pipe-jacking type deformation assembly for anchor cables and anchor rods is characterized by comprising the following steps:
step 1: drilling an anchor hole in a rock mass to be supported, wherein the diameter of the anchor hole is larger than that of an anchor rope steel strand (an anchor rod body), rotationally pushing the anchor rope steel strand (the anchor rod body) into the anchor hole, and fixing the inner end of the anchor rope steel strand (the anchor rod body) in the anchor hole through an anchoring agent;
and 2, step: sleeving a tray, a restraint ring, a contraction pipe and an anchorage device (nut) on an anchor cable steel strand (an anchor rod body) in sequence, pressing the components on the surface of a rock body through the anchorage device (nut), enabling the tray to abut against the rock body, enabling the restraint ring to abut against the tray, enabling the contraction pipe to abut against the restraint ring, and enabling the anchorage device (nut) to abut against the contraction pipe;
and step 3: prestress is applied through tensioning equipment according to needs, and an anchorage device (a nut) is fastened.
Furthermore, when the pipe-jacking type deformation assembly is used for an anchor rope (anchor rod) of underground engineering, the length of the contraction pipe is designed according to the rock deformation condition of a constructed section behind the current section, so that the length of the contraction pipe is approximately equal to or slightly greater than the rock deformation, and the length of an exposed structure after the rock deformation is prevented from greatly hindering subsequent construction.
Further, when the pipe jacking type deformation assembly is used for an anchor cable of underground engineering, after the steps are completed, the construction of spraying concrete on the surface of a tunnel is usually carried out, if the concrete cannot completely cover the pipe jacking type high-strength deformation assembly, and the subsequent deformation of the rock mass cannot extrude the shrinkage pipe into the outer surface of the sprayed concrete, in order to prevent the line invasion of the exposed section of the anchor cable, after the deformation of the rock mass is basically stopped, the steel strand is tensioned and the shrinkage pipe is extruded by the tensioning device, the shrinkage pipe is forcedly extruded into the constraint ring, the outer end surface of the constraint ring is positioned within the outer surface of the sprayed concrete, and redundant anchor cable steel strands are cut off.
Compared with the prior art, the invention has the following beneficial effects: the design is reasonable, and the pipe-jacking type deformation assembly can effectively realize stable high-strength constant-resistance yielding; the structure is simple, and the manufacturing cost is low; the deformation assembly is integrally arranged on the outer side of the rock mass, and hole expanding construction is not needed, so that the construction process is greatly simplified, and the labor intensity of an engineering site is reduced; the deformation degree of the deformation assembly (namely the sliding deformation between the restraint ring and the shrinkage pipe) is clear and visible, the deformation of the anchor cable (anchor rod) can be observed in real time, and the deformation of a rock body can be calculated, so that the danger is pre-warned; the forced deformation can be interfered by external force so as to prevent the redundant exposed structure from interfering other processes.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention after installation for use in a cable bolt;
FIG. 2 is a schematic cross-sectional view of a deformed anchor cable according to the present invention;
FIG. 3 is a schematic cross-sectional view of the confinement ring and the tray of the present invention;
FIG. 4 is a schematic cross-sectional view of the present invention after installation for use in a rock bolt;
FIG. 5 is a schematic view of a shrink tube of the present invention provided with a simple constriction;
FIG. 6 is a schematic view of the present invention without the constriction;
FIG. 7 is a cross-sectional view of the inner diameter of the confinement rings of the present invention in the form of two lines;
FIG. 8 is a schematic cross-sectional view of a confinement ring with an inner diameter in the form of a three-segment line in accordance with the invention;
FIG. 9 is a cross-sectional view of the inner diameter of a confinement ring of the present invention in the form of an arc;
fig. 10 is a graph of tension versus displacement under laboratory tensile conditions when the invention is applied to a cable bolt.
In the figure: 1-restraint ring, 2-shrinkage pipe, 3-tray, 4-anchorage device, 5-nut, 6-anchor cable steel strand, 7-anchor rod, 8-rock mass and 9-soft coating layer.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1-10, a pipe-jacking type deformation assembly for anchor cables and anchor rods comprises a restraint ring 1 and a contraction pipe 2, which is matched with the existing anchor cables or anchor rods; the whole assembly is arranged on the outer side of a rock mass 8, an anchor cable tray or an anchor rod tray 3 is abutted against the rock mass 8 corresponding to an anchor hole, the inner side of a restraint ring is abutted against the outer side of the tray corresponding to the anchor hole, and the inner end of a shrinkage pipe is inserted into the restraint ring corresponding to the anchor hole; the outer end of the anchor cable steel strand 6 or the anchor rod body 7 sequentially penetrates through the tray, the restraint ring and the contraction pipe, and is connected with an anchor cable anchorage device 4 or an anchor rod nut 5 on the outer side;
the restraining ring is of an annular structure, the inner diameter of the restraining ring is gradually reduced from the outer side to the inner side, and the inner diameter is kept unchanged or slightly enlarged after the restraining ring is reduced to the minimum inner diameter; the inner ring surface of the restraint ring can be an arc line, or can be a double fold line which is gradually reduced from outside to inside in pipe diameter and then is unchanged or slightly enlarged, or can be a triple fold line which is gradually reduced from outside to inside in pipe diameter, then is unchanged and then is gradually enlarged, as long as the inner diameter of the restraint ring can be gradually reduced from the outside to the inside, and is kept unchanged or slightly enlarged after being reduced to the minimum inner diameter;
the outer diameter of the main body of the shrinkage pipe is larger than the minimum inner diameter of the restraint ring, and the radial rigidity of the shrinkage pipe is smaller than that of the restraint ring;
one preferable shape of the restraint ring is a circular ring, and the preferable shape of the contraction tube is a hollow circular tube; it should be noted that the constraint ring may also be an elliptical ring, a polygonal ring, or the like, and the corresponding contraction tube may also be an elliptical tube, a polygonal tube, or the like;
when the restraint ring and the shrinkage pipe are coaxially and mutually extruded, the radial deformation of the restraint ring is small, the shrinkage pipe generates obvious radial shrinkage deformation, the outer diameter of the main body of the shrinkage pipe is equal to the minimum inner diameter of the restraint ring, and meanwhile, the restraint ring and the shrinkage pipe generate relative sliding;
after the inner end of the contraction pipe is inserted into the constraint ring, the contraction pipe still has a certain length outside the constraint ring, and the length is the maximum relative slippage between the contraction pipe and the constraint ring and is the maximum deformation capacity of the pipe-jacking type deformation assembly.
In this embodiment, the inner end of the shrink tube is provided with a necking, so that the inner end of the shrink tube can be conveniently inserted into the restriction ring, the problem that the center lines of the shrink tube and the restriction ring are not coaxial can be prevented, and the necking can be omitted for simplifying the processing procedure.
In the embodiment, the shrinkage of the cross section of the shrinkage pipe passing through the restraining ring is between 1% and 36%, when the shrinkage of the cross section is too small, the bearing capacity cannot be fully exerted, and when the shrinkage of the cross section is too large, the crushing stress of the shrinkage pipe is unstable; the cross-sectional shrinkage rate is the percentage of the reduction of the cross-sectional area of the shrinkage pipe to the original cross-sectional area.
In this embodiment, the outer surface of the shrink tube and the inner surface of the restriction ring are coated with a lubricating material, so that the contact relationship between the shrink tube and the restriction ring can be improved, and the resistance force generated when slippage occurs between the shrink tube and the restriction ring can be more stable.
As shown in figure 1, the outer surface of the shrinkage pipe is provided with a soft coating layer 9, the outer diameter of the soft coating layer is equal to or larger than that of the anchorage device or the nut, and the sprayed concrete in the later construction period of the anchorage device or the nut in the deformation process of the assembly is prevented. When the shrinkage pipe deforms and enters the restraint ring, the soft coating layer is separated from the shrinkage pipe and is left on the outer side of the restraint ring.
As shown in fig. 3, in order to reduce the number of components or save cost, the restraining ring and the tray are integrally formed, that is, the restraining ring and the tray are combined into a whole, or the periphery of the restraining ring is enlarged to enable the restraining ring to have the function of restraining the rock mass by the tray.
In addition, in order to identify the deformation degree of the rock mass, the outer surface of the shrinkage pipe can be provided with scale marks and/or annular color marks; it is convenient to observe the relative amount of slippage between the shrink tube and the confinement rings.
In addition, the outer surface of the shrink tube and the inner annular surface of the restraint ring can be provided with a rust-proof layer.
In addition, the shrinkage pipe and the anchorage device can also be integrally formed.
In addition, the top tube type high-strength deformation assembly can further comprise a relative displacement monitoring unit and a wireless communication unit between the shrinkage tube and the constraint ring, relative displacement between the shrinkage tube and the constraint ring can be sent to a remote terminal, and early warning is given out when deformation accumulation is large or is greatly increased in a short time.
An application method of a pipe-jacking type deformation assembly for anchor cables and anchor rods comprises the following steps:
step 1: drilling an anchor hole in a rock mass to be supported, wherein the diameter of the anchor hole is larger than that of an anchor rope steel strand (an anchor rod body), rotationally pushing the anchor rope steel strand (the anchor rod body) into the anchor hole, and fixing the inner end of the anchor rope steel strand (the anchor rod body) in the anchor hole through an anchoring agent;
step 2: sequentially sleeving a tray, a restraint ring, a shrinkage pipe and an anchor (nut) on an anchor cable steel strand (an anchor rod body), and pressing the components on the surface of a rock body through the anchor (nut) so that the tray is pressed against the rock body, the restraint ring is pressed against the tray, the shrinkage pipe is pressed against the restraint ring, and the anchor (nut) is pressed against the shrinkage pipe;
and step 3: prestress is applied through tensioning equipment according to needs, and an anchorage device (a nut) is fastened.
When the pipe-jacking type deformation assembly is used for an anchor rope (anchor rod) of underground engineering, the length of the contraction pipe is designed according to the rock deformation condition of a construction section behind a current section, so that the length of the contraction pipe is approximately equal to or slightly greater than the rock deformation, and the length of an exposed structure after the rock deformation is prevented from still greatly hindering subsequent construction.
When the pipe-jacking type deformation assembly is used for an anchor cable of underground engineering, the construction of spraying concrete on the surface of a tunnel is usually carried out after the steps are finished, if the concrete cannot completely cover the pipe-jacking type high-strength deformation assembly and the subsequent rock deformation cannot extrude the shrinkage pipe into the outer surface of the sprayed concrete, in order to prevent the line invasion of the exposed section of the anchor cable, after the rock deformation basically stops, the steel strand is tensioned and the shrinkage pipe is extruded through a tensioning device, the shrinkage pipe is forcibly extruded into a restraint ring, the outer end face of the shrinkage pipe is positioned in the outer surface of the sprayed concrete, and redundant anchor cable steel strand is cut off
Unless otherwise indicated, any of the above-described embodiments of the present invention disclose numerical ranges, which are preferred ranges, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding) can, of course, also be replaced by one-piece structures (e.g. manufactured in one piece using a casting process) (unless it is obvious that one-piece processes cannot be used).
In addition, the orientations or positional relationships indicated for indicating the positional relationships such as "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, applied in any of the technical aspects of the present disclosure described above are based on the orientations or positional relationships shown in the drawings and are only for convenience of describing the present disclosure, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as limiting the present disclosure, and the terms used for indicating the shapes applied in any of the technical aspects of the present disclosure described above are meant to include shapes similar, analogous or approximate thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications of the embodiments of the invention or equivalent substitutions for parts of the technical features are possible; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A pipe-jacking type deformation assembly for anchor cables and anchor rods is characterized in that the deformation assembly comprises a pipe jacking pipe, a pipe jacking pipe and a pipe jacking pipe; comprises a restraint ring and a contraction tube; the whole assembly is arranged on the outer side of a rock body, the anchor cable tray or the anchor rod tray is abutted against the rock body corresponding to the anchor hole, the inner side of the restraint ring is abutted against the outer side of the tray corresponding to the anchor hole, and the inner end of the shrinkage pipe is inserted into the restraint ring corresponding to the anchor hole; the outer end of the anchor cable steel strand or the anchor rod body sequentially penetrates through the tray, the restraint ring and the contraction pipe, and an anchor cable anchorage device or an anchor rod nut is connected to the outer side;
the restraining ring is of an annular structure, the inner diameter of the restraining ring is gradually reduced from the outer side to the inner side, and the inner diameter is kept unchanged or slightly enlarged after the restraining ring is reduced to the minimum inner diameter;
the outer diameter of the main body of the contraction pipe is larger than the minimum inner diameter of the restraint ring, and the radial rigidity of the contraction pipe is smaller than that of the restraint ring;
when the restraint ring and the shrinkage pipe are coaxially and mutually extruded, the radial deformation of the restraint ring is small, the shrinkage pipe generates obvious radial shrinkage deformation, the outer diameter of the main body of the shrinkage pipe is equal to the minimum inner diameter of the restraint ring, and meanwhile, the restraint ring and the shrinkage pipe generate relative sliding;
after the inner end of the contraction pipe is inserted into the constraint ring, the contraction pipe still has a certain length outside the constraint ring, and the length is the maximum relative slippage between the contraction pipe and the constraint ring and is the maximum deformation capacity of the pipe-jacking type deformation assembly.
2. The push pipe type deformation assembly for anchor cable and anchor rod as claimed in claim 1, wherein the inner end of said shrink pipe is provided with a reducing mouth to facilitate the insertion of the inner end of the shrink pipe into the confinement ring and to prevent the misalignment of the centerlines of the shrink pipe and the confinement ring.
3. The pipe-jacking deformation assembly for anchor cables and bolts as claimed in claim 1, wherein the shrinkage of the cross-section of said shrink pipe during passage through said confinement rings is between 1% and 36%.
4. A push pipe deformation assembly for anchor cables and rods as claimed in claim 1 wherein the confinement ring and the tray are integrally formed.
5. A push pipe deformation assembly for anchor cables and rods as claimed in claim 1 wherein the outer surface of the shrink tube and the inner surface of the confinement ring are coated with a lubricating material.
6. The pipe-jacking type deformation assembly for anchor cables and bolts according to claim 1, wherein the outer surface of said shrink pipe is provided with a soft coating layer, and the outer diameter of said soft coating layer is equal to or greater than the outer diameter of said anchor or nut.
7. The pipe-jacking type deformation assembly for anchor cables and bolts according to claim 1, wherein the outer surface of the shrink pipe is provided with scale marks and/or annular color marks.
8. An application method of a pipe-jacking type deformation assembly for anchor cables and anchor rods is characterized by comprising the following steps:
step 1: drilling an anchor hole in a rock mass to be supported, wherein the diameter of the anchor hole is larger than that of an anchor rope steel strand (an anchor rod body), rotationally pushing the anchor rope steel strand (the anchor rod body) into the anchor hole, and fixing the inner end of the anchor rope steel strand (the anchor rod body) in the anchor hole through an anchoring agent;
step 2: sleeving a tray, a restraint ring, a contraction pipe and an anchorage device (nut) on an anchor cable steel strand (an anchor rod body) in sequence, pressing the components on the surface of a rock body through the anchorage device (nut), enabling the tray to abut against the rock body, enabling the restraint ring to abut against the tray, enabling the contraction pipe to abut against the restraint ring, and enabling the anchorage device (nut) to abut against the contraction pipe;
and 3, step 3: prestress is applied through tensioning equipment according to needs, and an anchorage device (a nut) is fastened.
9. The method for applying the pipe-jacking type deformation assembly for the anchor cable and the anchor rod as claimed in claim 8, wherein when the pipe-jacking type deformation assembly is used for the anchor cable (anchor rod) of underground engineering, the length of the shrinkage pipe is designed according to the rock deformation condition of the constructed section behind the current section, so that the length of the shrinkage pipe is approximately equal to or slightly greater than the rock deformation.
10. The method of claim 8, wherein when the pipe-jacking deformation assembly is used for an anchor cable for underground works, in order to prevent the exposed section of the anchor cable from invading, the tension device is used to tension the steel strand and squeeze the contraction tube after the deformation of the rock mass is substantially stopped, the contraction tube is forcibly squeezed into the confinement ring so that the outer end surface of the contraction tube is positioned within the outer surface of the shotcrete, and the excess anchor cable steel strand is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640774.5A CN114991839B (en) | 2022-06-08 | 2022-06-08 | Push pipe type deformation assembly for anchor cable and anchor rod and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640774.5A CN114991839B (en) | 2022-06-08 | 2022-06-08 | Push pipe type deformation assembly for anchor cable and anchor rod and application method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114991839A true CN114991839A (en) | 2022-09-02 |
| CN114991839B CN114991839B (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210640774.5A Active CN114991839B (en) | 2022-06-08 | 2022-06-08 | Push pipe type deformation assembly for anchor cable and anchor rod and application method thereof |
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| CN (1) | CN114991839B (en) |
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| CN109209457A (en) * | 2018-10-26 | 2019-01-15 | 辽宁工程技术大学 | A kind of energy-absorbing erosion control anchor cable and its application method |
| CN109281694A (en) * | 2018-10-22 | 2019-01-29 | 山东建筑大学 | Can the self-locking of real-time display anchor pole or anchor cable axle power allow pressure pallet and operating method |
| CN113944492A (en) * | 2021-10-14 | 2022-01-18 | 中铁隧道集团二处有限公司 | Expansion shell type yielding anchor cable and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2124999U (en) * | 1992-04-02 | 1992-12-16 | 中国矿业大学 | High resistance extending anchor end fastener |
| CN2709524Y (en) * | 2004-03-27 | 2005-07-13 | 柳州欧维姆机械股份有限公司 | Autoregulation stress cable |
| CN200952401Y (en) * | 2006-09-27 | 2007-09-26 | 郑州宇建预应力有限公司 | Mine anchor |
| CN101225745A (en) * | 2008-02-18 | 2008-07-23 | 山西晋城无烟煤矿业集团有限责任公司 | Novel anchor cable for changing direction |
| CN203809024U (en) * | 2014-02-10 | 2014-09-03 | 扬州中矿矿业技术发展有限公司 | Novel tail fastening device for threaded anchor rod |
| CN104653208A (en) * | 2015-01-19 | 2015-05-27 | 中国矿业大学 | Simple micro-added resistance large-deformation anchorage device and method |
| CN109281694A (en) * | 2018-10-22 | 2019-01-29 | 山东建筑大学 | Can the self-locking of real-time display anchor pole or anchor cable axle power allow pressure pallet and operating method |
| CN109209457A (en) * | 2018-10-26 | 2019-01-15 | 辽宁工程技术大学 | A kind of energy-absorbing erosion control anchor cable and its application method |
| CN113944492A (en) * | 2021-10-14 | 2022-01-18 | 中铁隧道集团二处有限公司 | Expansion shell type yielding anchor cable and construction method thereof |
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| CN114991839B (en) | 2024-02-20 |
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