CN111305887A - Shear-resistant anchor pipe cable supporting structure and construction method - Google Patents
Shear-resistant anchor pipe cable supporting structure and construction method Download PDFInfo
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- CN111305887A CN111305887A CN202010379444.6A CN202010379444A CN111305887A CN 111305887 A CN111305887 A CN 111305887A CN 202010379444 A CN202010379444 A CN 202010379444A CN 111305887 A CN111305887 A CN 111305887A
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- Prior art keywords
- steel pipe
- anchor
- slotted steel
- pipe
- cable
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/03—Couplings; joints between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/006—Anchoring-bolts made of cables or wires
Abstract
The invention provides a shear-resistant anchor pipe cable supporting structure and a construction method, wherein the shear-resistant anchor pipe cable supporting structure comprises a slotted steel pipe, a hollow drill bit, an anchor cable, an anchoring agent, a supporting plate and an anchorage device, wherein the slotted steel pipe is provided with a longitudinal through-long pipe slot along the pipe wall, and the inner wall and the outer wall of the slotted steel pipe are carved with concentric threads; the hollow drill bit is connected and arranged at the head end of the slotted steel pipe; the anchor cable penetrates through the slotted steel pipe and the hollow drill bit and is arranged in the drill hole together with the slotted steel pipe and the hollow drill bit, the slotted steel pipe and the hollow drill bit are positioned at a free section of the anchor cable, and the anchoring agent is filled in an anchoring section of the anchor cable; the free section exposed anchor cable is anchored and fixed by the supporting plate and the anchor device. The anchor pipe and the supporting method thereof can improve the installation efficiency of the anchor pipe, protect the surrounding rock, improve the tensile property of the whole anchor pipe cable, prevent the anchor backing phenomenon and really realize the supporting and cooperative integration of the anchor cable, the slotted steel pipe and the surrounding rock.
Description
Technical Field
The invention relates to the technical field of structural support, mainly relates to roadway support, and particularly relates to a shear-resistant anchor pipe cable support structure and a construction method.
Background
In the existing roadway supporting mode, the supporting by using anchor rods and anchor cables is common, but the anchor rods have inconvenience due to too high rigidity, for example, the installation length is greatly limited by the roadway space, and the applied pretightening force is low; the anchor cable can be tensioned to obtain strong pretightening force, the anchor cable is good in flexibility and convenient to install, but the rigidity is lower than that of the anchor rod, particularly the shearing rigidity, and the application requirement of actual engineering is difficult to meet.
In view of the above deficiencies, an ACC shear Cable and C-Shaped tube structure has been invented. The shear-resistant anchor pipe cable is a novel coal mine roadway supporting technology, and effectively resists shearing damage of roadway surrounding rocks to an anchor cable by installing a slotted steel pipe between the anchor cable and a drill hole. For example, a prior invention of the inventor, CN103967509B (anchor pipe cable supporting structure capable of bearing transverse shear force), specifically discloses that after a hole is drilled in a surrounding rock, a part of the hole close to the outer end is reamed, a slotted steel pipe is installed at the reamed part, and a resin end part is installed inside the hole and inside the slotted steel pipe to anchor an anchor cable; the free end of the anchor cable is protected by the slotted steel pipe, and the shearing rigidity of the anchor cable is enhanced. Shear anchor cables have found good application in construction sites, but at the same time, there are some problems, such as: the steel pipe that cracks is because rigidity is too big, and the diameter is great than stock, anchor rope, often can take place the card pipe phenomenon when pushing away toward drilling the inside during installation, for the steel pipe can install preset position, needs reaming many times, and efficiency is lower, and has to produce destruction many times to the country rock, probably can lead to drill way country rock to slump.
In addition, after the shear-resistant anchor pipe cable is installed in the drilled hole, the slotted steel pipe slides outwards the drilled hole due to deformation of surrounding rocks of the roadway, the length of the slotted steel pipe in direct contact with the surrounding rocks is reduced, and an anchor withdrawing phenomenon that the steel pipe pushes out the anchor cable tray occurs, so that the pretightening force of the anchor cable is directly failed, and a supporting system is failed. The invention patent application CN108756975A discloses a novel shearing-resistant protective pipe for an anchoring device and an installation method thereof, and particularly discloses that the shearing-resistant protective pipe comprises a high-strength sleeve and a locking device, wherein outer teeth are arranged on the outer side of the high-strength sleeve, the outer teeth are in a strip tooth state, and when the shearing-resistant protective pipe is extruded by outer rocks, the outer teeth can crush the rocks in a shallow layer so as to relieve the extrusion force of the rocks, so that the rocks of the shearing-resistant protective pipe are broken more easily, and the possibility that the rocks resist the shearing-resistant protective pipe to be sheared is reduced. It can be seen that although this document discloses a shear-resistant casing and an external tooth structure provided on the casing, the technical problem to be solved is the squeezing action of the rock against the pipe, breaking the rock by means of the external tooth structure, and alleviating the possibility of shearing of the pipe by the rock, and this document does not pay attention to the anchor withdrawal phenomenon.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a shear-resistant anchor pipe cable supporting structure and a construction method, which improve the installation efficiency of an anchor pipe, protect surrounding rocks, improve the overall tensile property of an anchor pipe cable, prevent the occurrence of an anchor withdrawal phenomenon and really realize the supporting and cooperative integration of the anchor cable, a slotted steel pipe and the surrounding rocks.
The technical scheme of the invention is as follows:
the invention firstly provides a shear-resistant anchor pipe cable supporting structure, which comprises a slotted steel pipe, a hollow drill bit, an anchor cable, an anchoring agent, a supporting plate and an anchor device, wherein,
the slotted steel pipe is provided with a longitudinal through-long pipe slot along the pipe wall, concentric threads are carved on the inner wall and the outer wall of the slotted steel pipe, and the threads face to the tail end of the slotted steel pipe to form a pawl structure in the direction opposite to the drilling direction;
the hollow drill bit is connected and arranged at the head end of the slotted steel pipe;
the anchor cable penetrates through the slotted steel pipe and the hollow drill bit and is arranged in the drill hole together with the slotted steel pipe and the hollow drill bit, the slotted steel pipe and the hollow drill bit are positioned at a free section of the anchor cable, the anchoring agent is filled in an anchoring section of the anchor cable, and the anchoring agent and the anchor cable at the anchoring section form an anchoring body together;
the free section exposed anchor cable is anchored and fixed by the supporting plate and the anchor device.
As an improvement, the two ends of the slotted steel pipe are respectively provided with a threaded connection section, the threaded connection section at the head end is in threaded connection with the hollow drill bit, the threaded connection section at the tail end is in threaded connection with an adapter when the slotted steel pipe is installed, and the adapter is in threaded connection with the jumbolter.
As an improvement, the threaded connection section of the head end is a reducing section, the reducing section is carved with external threads, the hollow drill bit is carved with internal threads, the internal threads of the hollow drill bit are in threaded connection with the external threads of the reducing section to realize that the hollow drill bit is fixed on the slotted steel pipe, and the external diameter of the hollow drill bit is the same as that of the slotted steel pipe.
As an improvement, the threaded connection section of the head end is an internal thread engraved on the inner wall of the slotted steel pipe, the hollow drill bit is engraved with an external thread, the external thread of the hollow drill bit is in threaded connection with the internal thread of the head end of the slotted steel pipe to realize that the hollow drill bit is fixed on the slotted steel pipe, and the outer diameter of the hollow drill bit is the same as that of the slotted steel pipe.
As an improvement, the threaded connection section of tail end is the reducing section, and the external screw thread has been carved to the reducing section, adapter one end is carved with the internal thread, and the external screw thread spiro union of the internal thread of adapter and reducing section realizes that the adapter is fixed in the steel pipe that cracks.
As an improvement, the threaded connection section of tail end is for carving in the internal thread of slotting the steel pipe inner wall, the external screw thread is carved with to adapter one end, and the external screw thread of adapter and the internal thread spiro union of slotting the steel pipe tail end realize that the adapter is fixed in the steel pipe that cracks.
As an improvement, the threaded connection section of tail end is for carving in the external screw thread that cracks the steel pipe outer wall, adapter one end is carved with the internal thread, and the external screw thread spiro union of the internal thread of adapter and the steel pipe tail end of cracking realizes that the adapter is fixed in the steel pipe that cracks.
As a refinement, the concentric thread profile is in the shape of a right triangle with the smaller acute angle of the right triangle facing the leading end and the hypotenuse of the right triangle sloping outwardly from the leading end towards the trailing end.
As a refinement, the right triangle angles are 30 °, 60 ° and 90 °, and the 30 ° angle is towards the head end.
Another embodiment of the present invention provides a construction method of a shear anchor pipe cable support structure, including the steps of:
s11: drilling by a jumbolter;
s12: installing an anchoring agent in the borehole;
s13: installing a common shear resistant anchor pipe in the drill hole, and pulling out the common shear resistant anchor pipe which cannot be installed in place from the drill hole;
s14: installing a hollow drill bit at the head end of the slotted steel pipe, installing an adapter at the tail end of the slotted steel pipe, and drilling the slotted steel pipe into a drill hole to a preset depth by using an anchor rod drilling machine to connect the adapter;
s15: removing the adapter, penetrating an anchor rope into the slotted steel pipe, enabling the anchor rope to penetrate through the hollow drill bit to be contacted with the anchoring agent, and stirring the anchor rope while pushing the anchor rope until the anchor rope reaches the bottom of the hole;
s16: installing a supporting plate outside the drilled hole, and anchoring the anchor cable by an anchorage device;
s17: and after the anchoring agent is solidified, applying pretightening force to the anchor cable by using a tensioning machine.
Compared with the prior art, the invention has the beneficial effects that: the shear-resistant anchor pipe cable supporting structure provided by the invention can improve the installation efficiency of the anchor pipe, protect surrounding rock, improve the overall tensile property of the anchor pipe cable and prevent the anchor backing phenomenon. Specifically, at least the following practical effects are obtained:
(1) the hollow drill bit and the adapter are arranged on the slotted steel pipe, so that repeated damage to surrounding rocks caused by repeated reaming when the steel pipe is difficult to advance in the prior art is avoided, the slotted steel pipe is left in a drill hole after being drilled and is directly used as a permanent shear-resistant steel pipe, the auxiliary drilling and the shear-resistant steel pipe are combined into a whole, the field construction efficiency is greatly improved, and the drilled surrounding rocks are protected from excessive damage;
(2) the concentric threads of the outer wall and the inner wall of the steel pipe are matched with the pipe seam, under the action of surrounding rocks, the concentric threads of the inner wall increase the biting force between the steel pipe and the anchor cable, the relative sliding between the steel pipe and the anchor cable is prevented, the biting force and the anchoring force of the anchoring section act together, and the tensile property and the shearing resistance of the whole anchor pipe cable can be effectively improved;
(3) the concentric threads of the outer wall pawl structure greatly increase the occlusion between the slotted steel pipe and the surrounding rock, so that the slotted steel pipe can be self-locked on the surrounding rock wall, the slotted steel pipe is effectively prevented from being ejected out, the effective contact length of the slotted steel pipe and the surrounding rock is ensured, and the anchor withdrawing phenomenon is prevented;
(4) the angle design of the inverted tooth structure can generate certain damage and displacement effects on local rock mass obstacles on the inner wall of a drilled hole when a drill bit drills, thereby being beneficial to smooth propulsion of a steel pipe and forming an effective self-locking effect;
(5) the concentric threads on the outer wall and the inner wall of the steel pipe act simultaneously, so that the anchor cable, the slotted steel pipe and the surrounding rock form a firm whole, and the supporting and supporting cooperation integration of the anchor cable, the slotted steel pipe and the surrounding rock is really realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic view of a shear anchor pipe cable supporting structure according to an embodiment of the present invention;
FIG. 2 is a schematic view of the assembled state of the slotted steel tube, core drill bit and adapter of one embodiment of the present invention;
FIG. 3 is a schematic structural view of a slotted steel tube according to an embodiment of the present invention;
FIG. 4 is a schematic representation of the construction of a hollow core drill bit according to one embodiment of the present invention;
figure 5 is a schematic structural view of an adapter according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a slotted steel tube according to another embodiment of the present invention;
FIG. 7 is a schematic view of a hollow core drill bit according to another embodiment of the present invention;
figure 8 is a schematic structural view of an adapter according to another embodiment of the present invention;
FIG. 9 is a schematic view of an assembled state of a slotted steel tube, core drill bit and adapter according to another embodiment of the present invention;
FIG. 10 is a schematic structural view of a slotted steel pipe according to yet another embodiment of the present invention;
figure 11 is a schematic structural view of an adapter according to yet another embodiment of the present invention;
FIG. 12 is a schematic view of a slotted steel tube, core drill bit and adapter of another embodiment of the present invention in an assembled state;
FIG. 13 is a schematic view of a concentric thread configuration according to one embodiment of the present invention;
FIG. 14 is a schematic view of a concentric thread detail of one embodiment of the present invention;
FIG. 15 is a schematic view of a shear anchor tube structure according to the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are described in further detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It is to be understood that the terms "comprises/comprising," "consisting of … …," or any other variation, are intended to cover a non-exclusive inclusion, such that a product, device, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, device, process, or method if desired. Without further limitation, an element defined by the phrases "comprising/including … …," "consisting of … …," or "comprising" does not exclude the presence of other like elements in a product, device, process, or method that comprises the element.
It will be further understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship as shown in the drawings, which is meant only to facilitate describing the invention and to simplify the description, and do not indicate or imply that the referenced device, component, or structure must have a particular orientation, be constructed or operated in a particular orientation, and is not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and 3, the invention further provides an integrated shear-resistant anchor pipe cable supporting structure for supporting and reinforcing roadway surrounding rock 9, which comprises a slotted steel pipe 1, a hollow drill bit 2, an anchor cable 4, an anchoring agent 5, a supporting plate 6 and an anchorage device 7.
The slotted steel pipe 1 is provided with a longitudinal through long pipe slot 101 along the pipe wall, concentric threads are carved on the inner wall and the outer wall of the pipe, the concentric thread 102 of the outer wall and the concentric thread 103 of the inner wall face the tail end of the slotted steel pipe, and a pawl structure opposite to the drilling direction is formed;
the hollow drill bit 2 is connected and arranged at the head end of the slotted steel pipe;
the anchor cable 4 penetrates through the slotted steel pipe 1 and the hollow drill bit 2 and is installed in the drill hole together with the slotted steel pipe and the hollow drill bit, the drill hole is formed in the design position of the surrounding rock 9 in advance in a construction mode, the slotted steel pipe and the hollow drill bit are located in the free section of the anchor cable, the anchoring agent is filled in the anchoring section of the anchor cable, and the anchoring agent and the anchor cable of the anchoring section jointly act to form an anchoring body.
The free section exposed anchor cable is anchored and fixed by a supporting plate 6 and an anchorage device 7.
According to the invention, the hollow drill bit is additionally arranged at the head end of the slotted steel pipe, so that the drilling can be assisted during pipe clamping, the construction efficiency is improved, meanwhile, the concentric threads have the function of preventing anchor withdrawal, and the integrated cooperative support of the anchor pipe, the inner anchor cable and the outer surrounding rock is really realized.
Referring to fig. 2 to 5, as an embodiment of the present invention, two ends of a slotted steel pipe 1 are respectively provided with a threaded connection section, a threaded connection section 104 at the head end is in threaded connection with a hollow drill bit 2, and a threaded connection section 105 at the tail end is used for in threaded connection with an adapter 3 when the slotted steel pipe needs to be installed in a drilling hole, and the adapter is in threaded connection with a jumbolter (not shown in the figure). The slotted steel pipe, the hollow drill bit and the adapter are convenient to be quickly connected and disassembled by means of the threaded connection section.
As an embodiment of the present invention, the threaded connection section 104 at the head end is a diameter-reducing section, the diameter-reducing section is engraved with external threads, the hollow drill 2 is engraved with internal threads, and the internal threads of the hollow drill are screwed with the external threads of the diameter-reducing section to fix the hollow drill to the slotted steel pipe.
According to the invention, the outer diameter of the hollow drill bit 2 is designed to be the same as that of the slotted steel pipe 1, as shown in fig. 2, after the hollow drill bit is connected with the slotted steel pipe, the outer surface of the hollow drill bit is flush with that of the slotted steel pipe, the hollow drill bit cannot influence the outer wall of the slotted steel pipe to be fully contacted with surrounding rocks, the pipe joints can fully exert yielding effect when the surrounding rocks are contacted with the slotted steel pipe, and meanwhile, the concentric threads 102 are fully contacted with the surrounding rocks, so that the anti-anchor withdrawal effect can be fully exerted.
Referring to fig. 6 to 9, as another embodiment of the present invention, the threaded connection section 104 at the head end is an internal thread engraved on the inner wall of the slotted steel pipe, the hollow drill 2 is engraved with an external thread, the external thread of the hollow drill is screwed with the internal thread at the head end of the slotted steel pipe to fix the hollow drill to the slotted steel pipe, and the external diameter of the hollow drill is the same as the external diameter of the slotted steel pipe.
Referring to fig. 2-5 again, the threaded connection section 105 at the tail end is a reducing section, an external thread is carved on the reducing section, an internal thread is carved on one end of the adapter 3, the internal thread of the adapter is in threaded connection with the external thread of the reducing section to realize that the adapter is fixed on the slotted steel pipe, and the adapter is used for connecting a jumbolter.
Referring to fig. 6-9 again, the threaded connection section 105 at the tail end is an internal thread carved on the inner wall of the slotted steel pipe 1, an external thread is carved at one end of the adapter 3, the external thread of the adapter is in threaded connection with the internal thread at the tail end of the slotted steel pipe to realize that the adapter is fixed on the slotted steel pipe, and the adapter is used for connecting a jumbolter.
Referring to fig. 10 to 12, as another embodiment of the present invention, the threaded connection section 105 at the tail end is an external thread engraved on the outer wall of the slotted steel pipe, the external thread may be engraved alone or may be a concentric thread 102, an internal thread is engraved at one end of the adapter 3, the internal thread of the adapter is screwed with the external thread at the tail end of the slotted steel pipe to fix the adapter to the slotted steel pipe, and the adapter is used for connecting a jumbolter.
Obviously, in addition to the above illustration, the threaded connection sections at the two ends of the slotted steel pipe may have other combination forms, for example, the head end is an internal thread, and the tail end is an external thread engraved on the outer wall of the slotted steel pipe; or the head end is an internal thread and the tail end is a reducing section; or the head end is a reducing section, and the tail end is an internal thread.
Except for threaded connection, the slotted steel pipe, the hollow drill bit and the adapter can be connected in other detachable connection modes, such as clamping.
With continued reference to fig. 13 to 14, as an embodiment of the present invention, the cross-sectional shapes of the concentric threads of the inner wall and the outer wall of the slotted steel pipe are right triangles, and a smaller acute angle of the right triangle is toward the head end, and a hypotenuse of the right triangle is inclined outward from the head end of the slotted steel pipe toward the tail end, that is, the hypotenuse is radially outward toward the tail end of the slotted steel pipe, so as to form an inverted tooth structure toward the tail end of the slotted steel pipe.
Furthermore, by combining repeated verification of engineering practice, the right-angled triangle is designed to be 30 degrees, 60 degrees and 90 degrees, the 30-degree angle faces the head end of the pipe, the 60-degree angle faces the tail end of the pipe, the tip formed by the 60-degree angle forms an effective inverted tooth structure, and simultaneously, the sharp-angled structure and the bevel edge formed by the 30-degree angle form an inclined slope structure.
The outer diameter of the slotted steel pipe is 28mm, the inner diameter is 24mm, the width of the pipe slot is 4mm, and the outer diameter of the hollow drill bit is 28mm and the outer diameter of the slotted steel pipe are kept consistent. The length of the slotted steel pipe is 1.5-2.5m, preferably 2m according to the field construction condition.
The invention also provides a construction method of the shear-resistant anchor pipe cable supporting structure, which comprises the following steps:
firstly, a roof bolter is used for drilling holes in roadway surrounding rocks 9, wherein the holes comprise top plate surrounding rocks and side surrounding rocks;
then installing an anchoring agent 5 in the drilled hole;
then installing a common shear anchor pipe 8 in the borehole, wherein the shear anchor pipe 8 is also provided with a pipe gap, as shown in figure 15, but does not have the concentric threads of the invention, and pulling out the shear anchor pipe 8 which cannot be installed in place due to pipe clamping of the borehole wall from the borehole;
then a hollow drill bit 2 is arranged at the head end of the slotted steel pipe 1, an adapter 3 is arranged at the tail end of the slotted steel pipe, and the slotted steel pipe is drilled into the drill hole to a preset depth by using an anchor rod drilling machine to connect the adapter;
the slotted steel pipe is left in the hole together with the hollow drill bit after being installed and used as a permanent shear-resistant anchor pipe, the adapter is removed, then an anchor cable 4 penetrates through the slotted steel pipe, the anchor cable penetrates through the hollow drill bit to be in contact with an anchoring agent 5, the anchor cable is stirred while being pushed until reaching the bottom of the hole, and finally the anchor cable and the anchoring agent act together to form an anchoring body;
finally, a supporting plate 6 is arranged outside the drilled hole, and the anchor cable is anchored by an anchorage device 7;
and after the anchoring agent is solidified, applying pretightening force to the anchor cable by using a tensioning machine.
The invention has the following action principle:
when an ACC shear anchor pipe cable is used for supporting a roadway, if the conventional common shear anchor pipe 8 construction is difficult to advance to the designed depth, the ACC shear anchor pipe cable supporting device is adopted, a slotted steel pipe 1 is provided with a hollow drill bit 2 and an adapter 3, the adapter 3 is connected with a jumbolter, the hollow drill bit 2 is driven by the jumbolter to drill in a rotating mode, the slotted steel pipe 1 can be easily advanced to the designed depth in a drilled hole, at the moment, the adapter is only needed to be detached, the steel pipe and the hollow drill bit are not taken out, the slotted steel pipe is left in the drilled hole to be directly used as a permanent shear steel pipe, auxiliary drilling and the shear steel pipe are combined into a whole, the site construction efficiency is greatly improved, multiple damages to surrounding rocks caused by multiple chambering when the steel pipe is difficult to advance in the prior art are avoided, the integrity of the surrounding.
On the other hand, the concentric threads are designed to be matched with the pipe seams, the slotted steel pipe is closed after being extruded by surrounding rocks, a yielding space is formed for the surrounding rocks, at the moment, the concentric threads on the inner wall of the steel pipe are attached to the anchor cable, the anchor cable is locked by the concentric threads of the inverted tooth structure on the inner wall of the steel pipe, the biting force between the steel pipe and the anchor cable is increased, the relative sliding between the steel pipe and the anchor cable is prevented, the biting force of the steel pipe on the anchor cable and the anchoring force of the anchoring section act together, the overall tensile property of the anchor pipe cable can be effectively improved, and meanwhile, the slotted steel pipe provides effective shear resistance.
On the other hand, after the roadway is excavated, the stress of surrounding rock of the roadway is redistributed, and a horizontal stress and a vertical stress concentration area can be formed on a roadway top plate and a side part. At the moment, the surrounding rock at the shallow part of the roadway is changed into a state of approximate two-way stress from the original three-way stress. The surrounding rock is easy to deform and damage under the action of concentrated stress, and the surrounding rock at the top plate and the side part of the roadway has a deformation trend 10 towards the interior of the roadway, as shown in fig. 1. At the moment, the anchor cable is not easy to displace under the action of the anchoring section at the deep part of the surrounding rock, the slotted steel pipe is arranged between the anchor cable and the surrounding rock, and no anchoring measure is provided, so that the anchor cable is easy to displace along with the surrounding rock in the same direction, namely, the anchor withdrawing phenomenon is easy to occur. The slotted steel pipe moving towards the inner part of the roadway causes larger local stress to the anchoring supporting plate at the tail part of the slotted steel pipe, so that the supporting plate is ejected out by the steel pipe, and the whole shear-resistant anchoring pipe cable anchoring machine can fail.
According to the invention, the concentric threads of the inverted tooth structure are designed on the outer wall of the steel pipe, so that the occlusion between the slotted steel pipe and the surrounding rock is greatly increased, the slotted steel pipe can be self-locked on the surrounding rock wall, the slotted steel pipe is effectively prevented from being ejected out, and the anchor withdrawing phenomenon is prevented. The concentric screw thread of the pawl structure of combination steel pipe inner wall has increased the interlock power between steel pipe and the anchor rope, combines the interlock of inner wall concentric screw thread to the anchor rope for anchor rope, steel pipe and the surrounding rock of cracking form a firm whole, really realizes anchor rope, the supporting of steel pipe and the surrounding rock of cracking and cooperate the integration.
Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations and modifications can be made, which are consistent with the principles of the invention, from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. The utility model provides an anchor pipe cable supporting construction shears which characterized in that: comprises a slotted steel pipe, a hollow drill bit, an anchor cable, an anchoring agent, a supporting plate and an anchorage device, wherein,
the slotted steel pipe is provided with a longitudinal through-long pipe slot along the pipe wall, concentric threads are carved on the inner wall and the outer wall of the slotted steel pipe, and the threads face to the tail end of the slotted steel pipe to form a pawl structure in the direction opposite to the drilling direction;
the hollow drill bit is connected and arranged at the head end of the slotted steel pipe;
the anchor cable penetrates through the slotted steel pipe and the hollow drill bit and is arranged in the drill hole together with the slotted steel pipe and the hollow drill bit, the slotted steel pipe and the hollow drill bit are positioned at a free section of the anchor cable, the anchoring agent is filled in an anchoring section of the anchor cable, and the anchoring agent and the anchor cable at the anchoring section form an anchoring body together;
the free section exposed anchor cable is anchored and fixed by the supporting plate and the anchor device.
2. A shear anchor pipe and cable supporting structure according to claim 1, wherein the slotted steel pipe is provided at both ends thereof with a screw coupling section, the screw coupling section at the head end is screw-coupled to the hollow drill, and the screw coupling section at the tail end is screw-coupled to an adapter which is screw-coupled to a jumbolter when the slotted steel pipe is installed.
3. A shear anchor pipe and cable supporting structure according to claim 2, wherein the threaded connection section of the head end is a reduced diameter section, the reduced diameter section is engraved with external threads, the hollow drill is engraved with internal threads, the internal threads of the hollow drill are screwed with the external threads of the reduced diameter section to fix the hollow drill to the slotted steel pipe, and the external diameter of the hollow drill is the same as the external diameter of the slotted steel pipe.
4. The shear anchor pipe cable support structure according to claim 2, wherein the threaded connection section of the head end is an internal thread engraved on an inner wall of the slotted steel pipe, the hollow drill is engraved with an external thread, the external thread of the hollow drill is screwed with the internal thread of the head end of the slotted steel pipe to fix the hollow drill to the slotted steel pipe, and an outer diameter of the hollow drill is the same as an outer diameter of the slotted steel pipe.
5. The shear-resistant anchor pipe cable support structure according to claim 3 or 4, wherein the threaded connection section of the tail end is a reduced diameter section, an external thread is carved on the reduced diameter section, an internal thread is carved on one end of the adapter, and the internal thread of the adapter is screwed with the external thread of the reduced diameter section to realize the fixation of the adapter to the slotted steel pipe.
6. The shear-resistant anchor pipe cable support structure according to claim 3 or 4, wherein the threaded connection section of the tail end is an internal thread engraved on the inner wall of the slotted steel pipe, an external thread is engraved at one end of the adapter, and the external thread of the adapter is screwed with the internal thread of the tail end of the slotted steel pipe to fix the adapter to the slotted steel pipe.
7. The shear-resistant anchor pipe cable support structure according to claim 3 or 4, wherein the threaded connection section of the tail end is an external thread engraved on the outer wall of the slotted steel pipe, an internal thread is engraved at one end of the adapter, and the internal thread of the adapter is screwed with the external thread at the tail end of the slotted steel pipe to realize that the adapter is fixed on the slotted steel pipe.
8. A shear bolt tube cable support structure according to claim 1, wherein the concentric thread profiles are right triangles with the smaller acute angle of the right triangle towards the head end and the hypotenuse of the right triangle sloping outwards from the head end towards the tail end.
9. A shear anchor tube and cable support structure according to claim 8, wherein the right triangle is at each angle of 30 °, 60 ° and 90 °, and the angle of 30 ° is towards the head end.
10. A construction method of a shear bolt tube and cable supporting structure according to any one of claims 1 to 9, comprising the steps of:
s11: drilling by a jumbolter;
s12: installing an anchoring agent in the borehole;
s13: installing a common shear resistant anchor pipe in the drill hole, and pulling out the common shear resistant anchor pipe which cannot be installed in place from the drill hole;
s14: installing a hollow drill bit at the head end of the slotted steel pipe, installing an adapter at the tail end of the slotted steel pipe, and drilling the slotted steel pipe into a drill hole to a preset depth by using an anchor rod drilling machine to connect the adapter;
s15: removing the adapter, penetrating an anchor rope into the slotted steel pipe, enabling the anchor rope to penetrate through the hollow drill bit to be contacted with the anchoring agent, and stirring the anchor rope while pushing the anchor rope until the anchor rope reaches the bottom of the hole;
s16: installing a supporting plate outside the drilled hole, and anchoring the anchor cable by an anchorage device;
s17: and after the anchoring agent is solidified, applying pretightening force to the anchor cable by using a tensioning machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010379444.6A CN111305887B (en) | 2020-05-08 | 2020-05-08 | Shear-resistant anchor pipe cable supporting structure and construction method |
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| CN202010379444.6A CN111305887B (en) | 2020-05-08 | 2020-05-08 | Shear-resistant anchor pipe cable supporting structure and construction method |
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| CN111305887B CN111305887B (en) | 2021-06-25 |
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| CN209368816U (en) * | 2018-10-10 | 2019-09-10 | 中建五局土木工程有限公司 | It is a kind of for increasing the diplopore anchoring rod structure of withdrawal resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2658403Y (en) * | 2003-11-21 | 2004-11-24 | 宋彦波 | Steel strand rockbolt with whole-thread adapter sleeve by cold-drawing extrusion |
| CN103967509A (en) * | 2014-05-15 | 2014-08-06 | 中国矿业大学(北京) | Anchor pipe cable supporting structure capable of bearing lateral shear force |
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| CN111305887B (en) | 2021-06-25 |
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