CN115182765A - Slip casting NPR anchor cable - Google Patents
Slip casting NPR anchor cable Download PDFInfo
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- CN115182765A CN115182765A CN202211114126.2A CN202211114126A CN115182765A CN 115182765 A CN115182765 A CN 115182765A CN 202211114126 A CN202211114126 A CN 202211114126A CN 115182765 A CN115182765 A CN 115182765A
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- Prior art keywords
- anchor
- constant
- anchor cable
- pipe
- constant resistor
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- 238000007569 slipcasting Methods 0.000 title claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 61
- 239000011435 rock Substances 0.000 claims abstract description 51
- 239000002002 slurry Substances 0.000 claims abstract description 30
- 238000004873 anchoring Methods 0.000 claims abstract description 27
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 238000013461 design Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 53
- 239000010959 steel Substances 0.000 claims description 53
- 239000011440 grout Substances 0.000 claims description 43
- 239000004033 plastic Substances 0.000 claims description 15
- 238000012856 packing Methods 0.000 claims 5
- 230000000694 effects Effects 0.000 abstract description 12
- 238000003825 pressing Methods 0.000 description 9
- 239000004677 Nylon Substances 0.000 description 6
- 229920001778 nylon Polymers 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 210000004907 gland Anatomy 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- 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
- E21D21/0066—Anchoring-bolts formed by a bundle of radially arranged rigid elements
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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
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
-
- 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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- 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 belongs to the technical field of tunnel support, and particularly relates to a grouting NPR anchor cable. Slip casting NPR anchor rope includes: the anchor cable comprises an anchor cable body, wherein the tail end of the anchor cable body is provided with an anchoring section for anchoring at the bottom of a drilled hole; the constant resistor comprises a constant resistor body and a constant resistor sleeve, the constant resistor body is sleeved on the periphery of the anchor rope body, the constant resistor sleeve is arranged on the periphery of the constant resistor body, and the constant resistor body is used for moving along the axial direction of the anchor rope in the constant resistor sleeve with constant resistance; the constant resistor sealing assembly is arranged at the tail end of the constant resistor and used for plugging a gap between the anchor cable body and the drill hole, and the constant resistor compresses the constant resistor sealing assembly; the anchor assembly comprises a tray and an anchor, wherein the anchor and the tray are arranged at one end of the anchor rope body, which extends out of the surrounding rock drilling hole, and are used for anchoring and locking the anchor rope body after the anchor rope body reaches the design pre-tightening force through tensioning. The anchor cable is provided with the sealing assembly, so that the grouting anchoring effect is greatly improved; and has the characteristics of large deformation, high bearing capacity and no leakage of slurry.
Description
Technical Field
The invention belongs to the technical field of tunnel support, and particularly relates to a grouting NPR anchor cable.
Background
In underground engineering, the anchor cable is widely applied as a primary support construction with better reinforcement effect. Along with underground works marching to Qinghai-Tibet plateau, the tunnel inevitably will pass the fault, and fault area material is mostly cracked rock and fault mud gravel, and joint and micro-crack develop, and the rock mass is broken and is rubble angle gravel column structure, is unfavorable for the stability of anchor rope anchor end. The concretion body is formed in joints, microcracks and cavities inside the surrounding rock through grouting, so that the strength, stability, integrity and impermeability of the surrounding rock are improved, and further development of cracks inside the surrounding rock can be effectively inhibited, thereby achieving the purpose of improving the physical and mechanical properties of the surrounding rock. The surrounding rock after grouting reinforcement obtains higher strength and integrity, can provide higher anchoring force for the anchor rope, and grouting simultaneously increases the thickness of combination confession, is favorable to transmitting the high prestressing force of anchor rope to the deep part. The grouting NPR anchor cable can be used for reinforcing surrounding rocks in fault fracture zones by grouting, so that the strength and integrity of the surrounding rocks are improved, the anchor cable combination beam and suspension effect can be better exerted, and the stability of the surrounding rocks is guaranteed.
But the slip casting NPR anchor rope among the prior art makes slip casting anchoring effect can not obtain the guarantee because of the leakproofness is relatively poor.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a grouting NPR anchor cable, which at least solves the problems that grouting anchoring cannot be guaranteed due to poor sealing performance of the grouting NPR anchor cable in the prior art and the like.
In order to achieve the above purpose, the invention provides the following technical scheme:
grouting an NPR anchor cable, the grouting NPR anchor cable comprising:
the anchor cable comprises an anchor cable body, wherein the tail end of the anchor cable body is provided with an anchoring section for anchoring at the bottom of a drilled hole;
the constant resistor comprises a constant resistor body and a constant resistor sleeve, the constant resistor body is sleeved on the periphery of the anchor cable body, the constant resistor sleeve is arranged on the periphery of the constant resistor body, and the constant resistor body is used for moving along the axial direction of the anchor cable in the constant resistor sleeve with constant resistance;
the constant resistor sealing assembly is arranged at the tail end of a constant resistor and used for plugging a gap between the anchor rope body and a drill hole, and the constant resistor compresses the constant resistor sealing assembly;
the anchor assembly comprises a tray and an anchor, wherein the anchor and the tray are arranged at one end, extending out of the surrounding rock drilling hole, of the anchor rope body and are used for anchoring and locking the anchor rope body after the anchor rope body reaches the design pre-tightening force through tensioning.
The grouted NPR anchor line as described above, preferably, the constant resistor seal assembly comprises:
the sealing ring is sleeved on the periphery of the anchor cable body, arranged at the bottom of the constant-resistance sleeve and used for sealing the bottom of the constant-resistance sleeve;
the grout stopping plug is arranged between the anchor cable body and the drill hole and is used for plugging a gap and improving grouting pressure;
the pushing piece is arranged between the sealing ring and the slurry stopping plug and used for transmitting the pushing force of the constant resistor to the slurry stopping plug.
In the grouting NPR anchor cable, preferably, the pushing member is an i-shaped pushing pipe, and the i-shaped pushing pipe is sleeved on the anchor cable body;
the cross section shape of the end, close to the constant resistor, of the I-shaped push pipe is the same as that of the sealing ring, and the cross section shape of the end, close to the slurry stop plug, of the I-shaped push pipe is the same as that of the slurry stop plug.
In the grouting NPR anchor cable as described above, preferably, the end of the constant-resistance sleeve is provided with a flange, and the tray is sleeved on the periphery of the constant-resistance sleeve and pressed on the surrounding rock by the legal flange of the constant-resistance sleeve;
the anchor is a clamping piece type anchor, and the clamping piece type anchor is sleeved on the periphery of the anchor rope body and is in abutting contact with the constant-resistance body.
The grouting NPR anchor cable preferably includes a plurality of steel strands and a grouting pipe, the plurality of steel strands are wound around the periphery of the grouting pipe, the length of the steel strands is greater than that of the grouting pipe, and the steel strands are flush with the grouting pipe at one end of the anchor cable extending out of the drill hole.
In the grouting NPR anchor cable, preferably, a plastic pipe is connected to one end of the grouting pipe extending into the borehole, and a lap joint pipe is sleeved on the peripheries of the grouting pipe and the plastic pipe;
the anchor rope body is provided with a grout outlet between the plastic pipe and the anchoring section, and the grout outlet is formed by grout outlet gaps between any adjacent steel strands after the anchor rope body is expanded.
Preferably, the anchor cable body is sleeved with an outer sleeve, one end of the outer sleeve is located inside the constant-resistance sleeve, and the other end of the outer sleeve is located in front of the overlap joint pipe.
The grouting NPR cable bolt as described above preferably further comprises a cable bolt sealing assembly disposed at an end of the outer casing adjacent to the lap joint pipe.
The grouted NPR cable bolt as described above, preferably the cable bolt seal assembly comprises: the inner sealing tube is positioned between the steel strand and the grouting tube and is arranged corresponding to one end, close to the grout outlet, of the outer sleeve;
the outer sealing pipe is arranged on the periphery of the steel strand, and the outer sealing pipe and the outer sleeve are provided with a section of lap joint section.
As described above, in the slip casting NPR anchor cable, preferably, the anchor cable sealing assembly further includes an outer pressing pipe, the outer pressing pipe is sleeved on the periphery of the outer sealing pipe, and the outer pressing pipe is filled between the outer sealing pipe and the inner wall of the surrounding rock drill hole and used for plugging a gap between the outer sealing pipe and the surrounding rock drill hole.
Has the advantages that:
the grouting NPR anchor cable has better grouting efficiency. The anchor cable body has a hollow structure, a grouting core pipe is arranged, the grouting pipe and an exhaust pipe do not need to be bound on site, reverse pressure grouting is adopted, and the probability of air cavity generation is reduced. Meanwhile, the grouting nylon pipe is matched with the grouting steel pipe for use and is matched with the grout stop plug, so that the sealing effect is good, and the grouting construction efficiency is obviously improved; two sealing assemblies are arranged, so that the slurry can be effectively blocked; and the grouting pressure is improved to the maximum extent, and the grouting anchoring effect is greatly improved. The grouting NPR anchor cable has the characteristics of large deformation, high bearing capacity and no leakage of slurry.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic overall structure diagram of a grouting NPR anchor cable in an embodiment of the present invention;
FIG. 2 is a schematic view of a cable gland seal assembly according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a constant resistor seal assembly in an embodiment of the present invention;
FIG. 4 is a sectional view of a grout outlet in an embodiment of the present invention.
In the figure: 1-hollow hexagon nut, 2-anchor, 3-tray, 4-constant resistance body, 5-steel strand, 6-constant resistance sleeve, 7-sealing ring, 8-I-shaped push pipe, 9-expanding drill hole, 10-grout stop plug, 11-surrounding rock drill hole, 12-outer sleeve, 13-outer sleeve, 14-outer pressing pipe, 15-inner sealing pipe, 16-grouting pipe, 17-grout outlet, 18-anchoring section, 19-lap joint pipe, 20-nylon pipe and 21-grout outlet gap.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
According to a specific embodiment of the present invention, as shown in fig. 1-4, the present invention provides a grouted NPR cable, comprising: the anchor rope body, the terminal of anchor rope body is provided with anchor section 18 for the anchor is at the hole bottom of drilling. The constant resistor comprises a constant resistor body and a constant resistor sleeve 6, wherein the constant resistor body is sleeved on the periphery of the anchor cable body, the constant resistor sleeve 6 is arranged on the periphery of the constant resistor body 4, and the constant resistor body is used for moving along the axial direction of the anchor cable in the constant resistor sleeve 6 with constant resistance. The constant-resistance device sealing assembly is arranged at the tail end of the constant-resistance device and used for plugging a gap between the anchor cable body and a drilled hole, and the constant-resistance device compresses the constant-resistance device sealing assembly. The anchor assembly comprises a tray 3 and an anchor 2, wherein the anchor 2 and the tray 3 are arranged at one end, extending out of the surrounding rock drilling hole 11, of the anchor rope body, and are used for anchoring and locking the anchor rope body after the anchor rope body reaches design pre-tightening force through tensioning.
Through the end at the constant resistance ware sets up seal assembly, realized sealing up the gap between drilling and the anchor rope body, can be convenient for improve slip casting pressure, can also avoid the thick liquid in the drilling to spill over the constant resistance ware simultaneously, guarantee that the constant resistance ware can not contact with the thick liquid.
The constant resistance device seal assembly includes: the sealing ring 7 is sleeved on the periphery of the anchor cable body, arranged at the bottom of the constant-resistance sleeve 6 and used for sealing the bottom of the constant-resistance sleeve 6; in other embodiments, the sealing ring 7 and the constant-resistance sleeve 6 may also be an integral structure, and in this embodiment, the sealing ring 7 and the constant-resistance sleeve 6 are separately arranged, which can facilitate manufacture and installation.
The grout stopping plug 10 is arranged between the anchor cable body and the drill hole and used for plugging a gap and improving grouting pressure; in the embodiment, the grout stopping plug 10 is a circular pipe, the part of the grout stopping plug 10 extending into the surrounding rock drill hole 11 is a small-diameter section, the part of the grout stopping plug 10 positioned in the diameter-expanding drill hole 9 is a large-diameter section, the large-diameter section is in a circular truncated cone shape, and the diameter of the large-diameter section is gradually increased from the right to the left in fig. 1, so that the contact area of the grout stopping plug 10 and a push pipe is adapted; and the pushing piece is arranged between the sealing ring 7 and the slurry stopping plug 10 and is used for transmitting the pushing force of the constant resistor to the slurry stopping plug 10. The grout stopping plug 10 is abutted against the constant-resistance device through the pushing piece, the grout stopping plug 10 is guaranteed not to easily withdraw from the surrounding rock drilling hole 11, and the grout stopping plug 10 is guaranteed to have a sealing effect all the time.
The pushing piece is an I-shaped pushing pipe 8, and the I-shaped pushing pipe 8 is sleeved on the anchor cable body; the cross section of the I-shaped push pipe 8 close to one end of the constant resistor is the same as that of the sealing ring 7, and the cross section of the I-shaped push pipe 8 close to one end of the slurry stop plug 10 is the same as that of the slurry stop plug 10. The I-shaped push pipe 8 can increase the contact area with the sealing ring 7 and the slurry stop plug 10, and is more convenient for the pushing action of the constant resistance device and the slurry stop plug 10.
The end part of the constant-resistance sleeve 6 is provided with a flange flanging, the tray 3 is sleeved on the periphery of the constant-resistance sleeve 6 and is pressed on surrounding rocks by the legal flanging of the constant-resistance sleeve 6; the anchorage device 2 is a clamping piece type anchorage device 2, and the clamping piece type anchorage device 2 is sleeved on the periphery of the anchor cable body and is in abutting contact with the constant resistance body.
The flange limit of permanent resistance ware compresses tightly tray 3, and clip formula ground tackle 2 not with tray 3 direct contact for the anchor rope is receiving external force to take place to warp the back, and the anchor rope warp and drives clip formula ground tackle 2 and the constant resistance body 4 and move towards surrounding rock inside simultaneously, and constant resistance body 4 carries out the slip of constant resistance in constant resistance sleeve pipe 6, realizes the constant resistance deformation of anchor rope, makes the NPR anchor rope can take place to warp and can not fracture, has guaranteed the anchor rope effectual strut all the time.
In the embodiment, the anchorage device 2 is a clip type anchorage device 2, and is locked and fixed after being tensioned reversely by a tensioning device, so that the pre-tightening force of 30t can be provided; the tray 3 can be replaced by an umbrella-shaped anchoring tray 3 and a concave spherical foot adjusting pad ring.
The anchor rope body includes stranded conductor 5 and slip casting pipe 16, and stranded conductor 5 twines in the periphery of slip casting pipe 16, and the length of stranded conductor 5 is greater than the length of slip casting pipe 16, stretches out the one end of drilling at the anchor rope body, and stranded conductor 5 and slip casting pipe 16 parallel and level. In this embodiment, the grouting pipe 16 is a grouting steel pipe, which can improve the hardness and strength of the anchor cable body; the end part of the anchor cable body extending out of the drill hole is provided with a hollow hexagonal nut 1, the hollow hexagonal nut 1 is communicated with a grouting pipe 16, and hollow hexagonal threads are used as a slurry inlet and matched with a slurry check valve so as to be connected with grouting.
In the embodiment, the steel strand 5 is provided with 8 strands, the 8 strands of steel strand 5 densely wind the grouting steel pipe, and the steel strand 5 is made of NPR material; the grouting NPR anchor cable has a better supporting effect. On one hand, aiming at the support means of large deformation of the broken surrounding rock, NPR anchor cables which give consideration to large deformation and constant support resistance are adopted as support members. After the NPR anchor cable is grouted to exert the pretightening force on the NPR anchor cable, the anchor cable and the surrounding rock form an NPR rock mass structure, and the NPR rock mass structure can adapt to larger deformation of the surrounding rock. On the other hand, after the hollow steel strand 5 is used for grouting, the integrity of the NPR anchor cable and the broken surrounding rock is further increased, a thicker combined arch is formed, the large deformation of the broken surrounding rock can be coped with, and the supporting effect of the broken surrounding rock is greatly improved. The NPR anchor rope of slip casting combines NPR anchor rope construction process and slip casting process together, has realized a hole dual-purpose, can satisfy the installation of NPR anchor rope, can satisfy the slip casting needs again for it is more convenient to construct.
A plastic pipe is connected to one end of the grouting pipe 16 extending into the drill hole, and a lapping pipe 19 is sleeved on the peripheries of the grouting pipe 16 and the plastic pipe; the anchor rope body is provided with a grout outlet 17 between the plastic pipe and the anchoring section 18, and the grout outlet 17 is formed by a grout outlet gap 21 between any adjacent steel strands 5 after the anchor rope body is expanded.
Overlap joint pipe 19 and slip casting pipe 16, plastic tubing all have the part of overlap joint each other, and overlap joint pipe 19 is used for being connected slip casting pipe 16 and plastic tubing, and slip casting pipe 16 adopts the steel pipe to be convenient for increase the structural strength of anchor rope body, and uses the plastic tubing in thick liquid export position, and the elasticity of plastic tubing is bigger, the smooth outflow of the thick liquid of more being convenient for. The grouting steel pipe is a rigid slurry transportation channel, and the plastic pipe is a slurry head image transportation channel.
In this embodiment, the plastic tube is a nylon tube 20, and the nylon tube 20 has high strength and good toughness. The anchor cable body is expanded, and the grout outlet 17 is formed by the grout outlet gap 21 between the adjacent steel strands 5, so that grout can be smoothly discharged, the anchor cable body can be prevented from being damaged, and the anchor cable body has good structural strength all the time.
The anchor cable body is sleeved with an outer sleeve 12, one end of the outer sleeve 12 is positioned in the constant-resistance sleeve 6, and the other end is positioned in front of the lapping pipe 19.
The outer sleeve 12 not only integrates a section of the cable bolt body before the overlap joint tube 19, but also provides a better sealing performance for this section of the cable bolt body.
The grouted NPR cable bolt also includes a cable bolt seal assembly disposed at an end of the outer casing 12 adjacent the lap joint tube 19.
Set up anchor rope seal assembly through the tip at outer sleeve 12, take the one end of taking over pipe 19 to being close to of anchor rope body to seal, also seal in the position that is close to anchor rope body grout outlet 17 for form double seal in this slip casting NPR anchor rope, improved slip casting pressure greatly, make slip casting NPR anchor rope have better slip casting anchor effect.
The cable bolt sealing assembly comprises: the inner sealing tube 15 is positioned between the steel strand 5 and the grouting tube 16, and the inner sealing tube 15 is arranged corresponding to one end of the outer sleeve 12 close to the grout outlet 17; the outer sealing pipe 13 is arranged on the periphery of the steel strand 5, and the outer sealing pipe 13 and the outer sleeve 12 are provided with a lap joint section.
Interior sealed tube 15 forms the inside seal structure of steel strand wires 5, and outer sealed tube 13 can be to the outside seal structure of steel strand wires 5 for the steel strand wires 5 all seals with the interior junction of slip casting pipe 16, and here anchor rope seal assembly sets up and is close to out the grout mouth 17 position, forms the first way sealed in country rock drilling 11, provides the basis for forming better slip casting pressure.
The anchor cable sealing assembly further comprises an outer pressing pipe 14, the outer pressing pipe 14 is sleeved on the periphery of the outer sealing pipe 13, and the outer pressing pipe 14 is filled between the outer sealing pipe 13 and the inner wall of the surrounding rock drilling hole 11 and used for plugging a gap between the outer sealing pipe 13 and the surrounding rock drilling hole 11.
Set up outer pressure pipe 14, not only can be full of the better effect of compressing tightly of outer gland pipe 15 and outer gland pipe 13, can fill in the gap between outer gland pipe 13 and the country rock drilling 11 moreover for anchor rope seal assembly can play better sealed effect.
The grouting NPR anchor cable is used as follows:
firstly, drilling a surrounding rock borehole 11 in a rock body, then processing an expanded borehole 9 at the orifice section of the surrounding rock borehole 11, then sending a plurality of anchoring agent cartridges to the bottom of the surrounding rock borehole 11, then loading a hollow steel strand 5 (an assembled anchor cable) coated with an outer sleeve 12, an outer sealing pipe 13 and an outer pressing pipe 14 outside into the surrounding rock borehole 11, and driving the hollow steel strand 5 to stir the resin anchoring agent inserted into the bottom of the surrounding rock borehole 11 through external force until the resin anchoring agent is cured to reach the design strength.
After the hollow steel strand 5 is anchored at the bottom of a hole 11 of a surrounding rock drill hole through a resin anchoring agent, firstly, a grout stop plug 10 penetrates into the hollow steel strand 5, then, a tray 3 penetrates from the small end of a constant resistor 6 and is clamped after abutting against the large end of the constant resistor 6, then, the constant resistor 6 with a constant resistor bottom hole sealing ring 7 and an I-shaped push pipe 8 mounted at the bottom penetrates into the hollow steel strand 5 and is sent into an expanding drill hole 9, and finally, a clamping piece type anchorage device 2 is mounted at the tail end of the hollow steel strand 5.
And pushing the clip type anchorage device 2 into the end part of the constant resistor 6, applying pretightening force to the hollow steel strand 5 by using a jack tensioning device, and pushing the clip type anchorage device 2 by using a jack to slide on the hollow steel strand 5 until the designed pretightening force is reached, wherein the clip type anchorage device 2 anchors the hollow steel strand 5 by using the wedge-caulking principle of a taper hole.
When the hollow steel strand 5 reaches the design pretightening force, the jack tensioning equipment can be removed, then the grouting equipment with the grout check valve is connected with the hollow hexagon nut 1 at the end part of the hollow steel strand 5, grout sequentially passes through the hollow hexagon nut 1, the grouting steel pipe 16, the grouting nylon pipe 20, the grout outlet 17 and the grout outlet gap 21 and finally flows into the surrounding rock drilling hole 11, the grout enters the surrounding rock cracks from the bottom of the surrounding rock drilling hole 11 through reverse grouting, and after the grout is solidified, grouting and anchoring of broken surrounding rock are completed.
In addition, the hollow steel strand 5 is a factory prefabricated part, the grouting steel pipe 16, the inner sealing pipe 15, the lapping pipe 19, the grouting nylon pipe 20 and the hollow hexagon nut 1 inside are prefabricated and embedded firstly, the hollow hexagon nut 1 at the end part of the hollow steel strand 5 is provided with a plug, and the plug needs to be unscrewed during grouting.
Furthermore, before the constant resistor 6 is sent into the hole-expanding drill hole 9, the constant resistor bottom hole sealing ring 77 and the I-shaped push pipe 8 need to be installed in advance.
In order to avoid slurry leakage during grouting and slurry entering the constant resistance device 6, the invention adopts two measures for preventing slurry from leaking outside.
The first measure is an outer sleeve 12, an outer sealing pipe 13, an outer pressing pipe 14 and an inner sealing pipe 15, on one hand, grout barrier is formed between the outer sleeve 12 and the hollow steel strand 5, on the other hand, grout barrier is formed between the inner wall of the hollow steel strand 5 and a grouting steel pipe 16, and the first grout barrier in the deep part of the surrounding rock drilling hole 11 is completed in a combined mode.
The second measure is a constant-resistor bottom hole sealing ring 7, an I-shaped push pipe 8 and a grout stop plug 10, and the plugging of the surrounding rock drill hole 11 and the expanded drill hole 9 and the plugging of the expanded drill hole 9 and the bottom of the constant resistor 6 are completed in a combined mode. By the two measures for preventing the slurry from leaking outwards, the slurry at the bottom of the hole of the surrounding rock drill hole 11 cannot flow back to the position between the outer sleeve 12 and the hollow steel strand 5, and the slurry enters the constant resistor 6, so that on one hand, the hollow steel strand 5 is ensured to be provided with a free extension section, namely one end of the hollow steel strand 5, which is not in direct contact with the slurry, and therefore the NPR anchor cable can conveniently exert the large deformation capacity; on the other hand, the sliding space of the constant resistance body 4 in the constant resistance device 6 is ensured. Through the two slurry blocking measures, the grouting pressure can be improved to the maximum extent, and the grouting anchoring effect is greatly improved.
In summary, in the technical scheme of the grouting NPR anchor cable provided by the invention, the grouting pipe is combined with the stranded steel strands to form the anchor cable body, so that the anchor cable body is provided with the grouting core pipe, the grouting pipe and the exhaust pipe do not need to be bound on site, and reverse pressure grouting is adopted, so that the probability of generating cavitation cavities is reduced. Meanwhile, two sealing assemblies are arranged, so that the slurry can be effectively blocked; and the grouting pressure is improved to the maximum extent, and the grouting anchoring effect is greatly improved.
It should be understood that the above description is exemplary only and that the embodiments of the present application are not intended to be limiting.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the invention is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. Slip casting NPR anchor rope, characterized in that, slip casting NPR anchor rope includes:
the anchor cable comprises an anchor cable body, wherein the tail end of the anchor cable body is provided with an anchoring section for anchoring at the bottom of a drilled hole;
the constant resistor comprises a constant resistor body and a constant resistor sleeve, the constant resistor body is sleeved on the periphery of the anchor cable body, the constant resistor sleeve is arranged on the periphery of the constant resistor body, and the constant resistor body is used for moving along the axial direction of the anchor cable in the constant resistor sleeve with constant resistance;
the constant resistor sealing assembly is arranged at the tail end of a constant resistor and used for plugging a gap between the anchor cable body and a drill hole, and the constant resistor compresses the constant resistor sealing assembly;
the anchor assembly comprises a tray and an anchor, wherein the anchor and the tray are arranged at one end, extending out of the surrounding rock drilling hole, of the anchor rope body, and are used for anchoring and locking the anchor rope body after the anchor rope body reaches the design pre-tightening force through tensioning.
2. The slip-casting NPR anchor rope of claim 1, wherein the constant-resistor seal assembly comprises:
the sealing ring is sleeved on the periphery of the anchor cable body, arranged at the bottom of the constant-resistance sleeve and used for sealing the bottom of the constant-resistance sleeve;
the grout stopping plug is arranged between the anchor cable body and the drill hole and is used for plugging a gap and improving grouting pressure;
the pushing piece is arranged between the sealing ring and the slurry stopping plug and used for transmitting the pushing force of the constant resistor to the slurry stopping plug.
3. The slip-casting NPR anchor cable of claim 2, wherein the pushing piece is an i-shaped pushing pipe, and the i-shaped pushing pipe is sleeved on the anchor cable body;
the section shape of one end, close to the constant-resistance device, of the I-shaped push pipe is the same as that of the sealing ring, and the section shape of one end, close to the slurry stop plug, of the I-shaped push pipe is the same as that of the slurry stop plug.
4. The grouting NPR anchor rope as claimed in claim 2, wherein the end of the constant-resistance sleeve is provided with a flange, the tray is sleeved on the periphery of the constant-resistance sleeve and pressed on surrounding rocks by the legal flange of the constant-resistance sleeve;
the anchor is a clamping piece type anchor, and the clamping piece type anchor is sleeved on the periphery of the anchor rope body and is in abutting contact with the constant-resistance body.
5. The slip-casting NPR anchor cable of claim 1, wherein the anchor cable body comprises a plurality of steel strands and a slip casting pipe, the plurality of steel strands are wound around the slip casting pipe, the length of the steel strands is greater than the length of the slip casting pipe, and the steel strands are flush with the slip casting pipe at the end of the anchor cable body extending out of the bore hole.
6. The grouting NPR anchor cable as claimed in claim 5, wherein a plastic pipe is connected to one end of the grouting pipe extending into the borehole, and a lapping pipe is sleeved on the peripheries of the grouting pipe and the plastic pipe;
the anchor cable body is provided with a grout outlet between the plastic pipe and the anchoring section, and the grout outlet is formed by grout outlet gaps between any adjacent steel strands after the anchor cable body is expanded.
7. The slip casting NPR anchor cable of claim 6, wherein the anchor cable body is sleeved with an outer sleeve, one end of the outer sleeve is positioned in the constant-resistance sleeve, and the other end of the outer sleeve is positioned in front of the lap joint pipe.
8. The slip casting NPR cable bolt of claim 7, further comprising a cable bolt seal assembly disposed at an end of the outer casing proximate the lap joint tube.
9. The slip casting NPR anchor cable of claim 8, wherein the anchor cable seal assembly comprises: the inner sealing tube is positioned between the steel strand and the grouting tube and is arranged corresponding to one end, close to the grout outlet, of the outer sleeve;
the outer sealing pipe is arranged on the periphery of the steel strand, and the outer sealing pipe and the outer sleeve are provided with a section of lap joint section.
10. The grouting NPR anchor cable of claim 9, wherein the anchor cable sealing assembly further comprises an outer packing tube sleeved on the outer packing tube, the outer packing tube filling the gap between the outer packing tube and the inner wall of the surrounding rock borehole for plugging the gap between the outer packing tube and the surrounding rock borehole.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211114126.2A CN115182765B (en) | 2022-09-14 | 2022-09-14 | Slip casting NPR anchor cable |
| PCT/CN2022/135223 WO2023142654A1 (en) | 2022-09-14 | 2022-11-30 | Large-deformation and constant-resistance support grouting anchor cable |
| JP2023550306A JP2024505110A (en) | 2022-09-14 | 2022-11-30 | Anchor cable for grouting with large deformation, constant resistance and support function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211114126.2A CN115182765B (en) | 2022-09-14 | 2022-09-14 | Slip casting NPR anchor cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115182765A true CN115182765A (en) | 2022-10-14 |
| CN115182765B CN115182765B (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211114126.2A Active CN115182765B (en) | 2022-09-14 | 2022-09-14 | Slip casting NPR anchor cable |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2024505110A (en) |
| CN (1) | CN115182765B (en) |
| WO (1) | WO2023142654A1 (en) |
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| WO2023142654A1 (en) * | 2022-09-14 | 2023-08-03 | 中国矿业大学(北京) | Large-deformation and constant-resistance support grouting anchor cable |
| CN116641742A (en) * | 2023-07-27 | 2023-08-25 | 中国矿业大学(北京) | Rock wall opposite-pulling anchor cable in small clear distance tunnel |
| CN116906100A (en) * | 2023-09-12 | 2023-10-20 | 中国矿业大学(北京) | Intelligent pre-tightening yielding anchor cable and application method |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2023142654A1 (en) | 2023-08-03 |
| CN115182765B (en) | 2022-12-02 |
| JP2024505110A (en) | 2024-02-02 |
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