CN212508374U - Novel hollow grouting anchor rod adopting multidirectional energy-gathering blasting and fracturing - Google Patents
Novel hollow grouting anchor rod adopting multidirectional energy-gathering blasting and fracturing Download PDFInfo
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- CN212508374U CN212508374U CN202020917793.4U CN202020917793U CN212508374U CN 212508374 U CN212508374 U CN 212508374U CN 202020917793 U CN202020917793 U CN 202020917793U CN 212508374 U CN212508374 U CN 212508374U
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Abstract
The utility model provides a novel hollow grouting anchor rod adopting multidirectional energy-gathering blasting to crack, which comprises a multidirectional energy-gathering pipe, wherein the outer wall of the multidirectional energy-gathering pipe is uniformly provided with 4 energy-gathering grooves which are sunken inwards in radial directions and have the same size, and the cross section of each energy-gathering groove is in a V shape; the coupling sleeve is connected with the multidirectional energy-gathering pipe at one end; the hollow grouting anchor rod is provided with a conical anchor head at one end, and the anchor head is connected with the other end of the connecting sleeve; the other end of the hollow grouting anchor rod is provided with a fixing component; the middle of the fixing component and the anchor head is provided with an anchor rod body of the hollow grouting anchor rod. The utility model discloses simple structure reforms transform low cost, only connects the multidirectional powder charge that gathers in ordinary cavity slip casting stock bottom, and the scene is implemented conveniently, and strong adaptability is outstanding to burying hard rock tunnel country rock pre-splitting slip casting reinforcement and prevention rockburst effect deeply, can satisfy the variety of engineering demand, has higher on-the-spot direct application and worth.
Description
Technical Field
The utility model relates to a tunnel construction field, in particular to bury deeply that one kind adopts multidirectional energy gathering blasting to send the novel cavity slip casting stock that splits under the high stress country rock of hard rock.
Background
The deep-buried hard rock roadway surrounding rock often has the characteristics that the internal stress is higher, and the strain energy in the rock mass is greater, and when the strain energy exceeds the strength of the rock, the rock burst event can occur, great potential safety hazard is brought to the construction, and the hard rock roadway deformation caused by the rock burst is a difficult problem facing the roadway excavation process for a long time.
Aiming at the problem of deformation of surrounding rocks of a hard rock roadway, a cylindrical anchor rod is usually embedded in the stratum, and then a grouting supporting method is adopted to reinforce the rock mass, the principle is that the tensile force of a structure is transmitted through the bonding friction resistance strength of an anchoring body and surrounding media, so that the stress state of the rock mass is improved, the self strength and the stability of the rock mass are improved, and the method is one of the effective modes of roadway supporting at present; however, when the conventional anchor rod grouting is used for supporting roadway surrounding rocks with low crack development degree, the problems that the amount of grout injected into a stratum is small, the range of an anchoring body in a hole is small, the cohesive force of an anchoring system consisting of a rod body, grout and the surrounding rocks is insufficient and the like are often encountered, so that the anchoring force provided by the anchor rod grouting is insufficient to meet engineering requirements, and if serious rock burst occurs, the stratum and the anchor rod constructed in advance are deformed and damaged, so that the anchoring of a rock body is failed, and safety accidents are caused.
In addition, need beat the radial stress release hole of not adorning the stock near the vault and hunch waist near the face when adopting traditional anchor bolt support prevention rock burst to play the effect of releasing stress in advance, this kind of rock burst treatment measure has increased tunnel country rock support cost undoubtedly, consequently, need develop one kind and can provide the anchoring force that excels in, can prevent the novel slip casting stock of rock burst again, go on with the guarantee deep-buried hard rock tunnel construction safety.
SUMMERY OF THE UTILITY MODEL
The utility model provides an adopt multidirectional energy-gathering blasting to send novel cavity slip casting stock that splits, the problem of the rockburst that its purpose often meets in order to solve the tunnel excavation process.
In order to achieve the above object, the utility model provides an adopt multidirectional can explode and send novel cavity slip casting stock that splits, include:
the energy collecting device comprises a multidirectional energy collecting pipe, wherein 4 energy collecting grooves which are recessed inwards in the radial direction and have the same size are uniformly arranged on the outer wall of the multidirectional energy collecting pipe, and the cross section of each energy collecting groove is in a V shape;
one end of the coupling sleeve is connected with the multidirectional energy-gathering pipe, and a circular through hole is formed in the center of the coupling sleeve;
the hollow grouting anchor rod is provided with a conical anchor head at one end, and the anchor head is connected with the other end of the connecting sleeve; the other end of the hollow grouting anchor rod is provided with a fixing component; the middle of the fixing component and the anchor head is provided with an anchor rod body of the hollow grouting anchor rod, and a hollow pore passage is arranged inside the anchor rod body.
Preferably, the multidirectional energy gathering pipe is made of PVC material and is hollow inside.
Preferably, the taper angle of the bottom of the energy-concentrating groove is 60 °.
Preferably, the fixing component consists of a nut, a backing plate and a grout stop plug.
Preferably, the nut is located at the outermost end of the hollow grouting anchor rod, and the nut, the backing plate and the grout stop plug are sequentially connected to the other end of the hollow grouting anchor rod.
The above technical scheme of the utility model has following beneficial effect:
(1) after the stratum is locally fractured by adopting a multidirectional energy-gathering blasting technology, high-pressure grouting is carried out on the pre-fractured surrounding rock, so that high-pressure slurry permeates, extrudes and diffuses to form an irregular cement slurry mosaic body, the contact area of the anchoring body and the rock stratum is increased, the mechanical strength of the rock anchor is improved, the bonding force and the frictional resistance of the surface of the anchoring body are increased, the radial high pressure around the bottom of a drill hole is locked, and the purpose of improving the anchoring force is achieved.
(2) The anchor rod hole has the function of the stress release hole, and the surrounding rock of the hard rock roadway is actively presplitted and stress is released by adopting a multidirectional energy-gathered blasting presplitting mode so as to reduce the strength of rock burst. In the stratum with higher ground stress, the hole is loosened and blasted by small dosage and cracks the complete rock mass, thereby avoiding the phenomenon of stress concentration and greatly reducing the probability of rock burst.
(3) The utility model discloses simple structure reforms transform low cost, only connects the multidirectional powder charge that gathers in ordinary cavity slip casting stock bottom, and the scene is implemented conveniently, and strong adaptability is outstanding to burying hard rock tunnel country rock pre-splitting slip casting reinforcement and prevention rockburst effect deeply, can satisfy the variety of engineering demand, has higher on-the-spot direct application and worth.
Drawings
FIG. 1 is a main body diagram of the present invention;
fig. 2 is a cross-sectional view of the multi-directional energy collecting tube of the present invention.
Description of the reference numerals
1-a multidirectional energy-gathering pipe; 2-a coupling sleeve; 3-anchor head; 4-an anchor rod body; 5-stop plug; 6-a nut; 7-a backing plate; 8-PVC outer pipe; 9-energy gathering grooves; 10-explosive.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The utility model discloses to current problem, a novel cavity slip casting stock that adopts multidirectional energy gathering blasting to send and split is provided, include:
the energy collecting device comprises a multidirectional energy collecting pipe 1, wherein 4 energy collecting grooves 9 which are recessed inwards in the radial direction and have the same size are uniformly formed in the outer wall of the multidirectional energy collecting pipe 1, and the cross sections of the energy collecting grooves 9 are V-shaped; one end of the coupling sleeve 2 is connected with the multidirectional energy-gathering pipe 1, and a circular through hole is formed in the center of the coupling sleeve 2;
the grouting anchor rod is hollow, one end of the grouting anchor rod is provided with a conical anchor head 3, and the anchor head 3 is connected with the other end of the connecting sleeve 2; the other end of the hollow grouting anchor rod is provided with a fixing component; the middle of the fixing component and the anchor head 3 is provided with an anchor rod body 4 of the hollow grouting anchor rod, and a hollow pore passage is arranged inside the anchor rod body 4.
The utility model discloses coupling sleeve is provided with the circular through-hole that is used for inserting the detonator, and the detonator inserts behind the multidirectional energy gathering pipe, and the circular through-hole that the detonator passes through coupling sleeve gets into the cavity stock body of rod, and the lumen along draws forth. Aiming at deeply buried high-stress surrounding rock, the rock mass in the near area of an anchor rod hole is fractured by multi-directional energy accumulation blasting, high-energy jet flow generated in an energy accumulation groove during blasting is utilized to penetrate the rock mass, so that the hard rock at the hole bottom charging part generates directional cracks, meanwhile, the surrounding rock is loosened by blasting and pre-fracturing, the original stress of the rock is released, the rock burst strength is weakened, high-pressure mortar is injected into the anchor rod immediately, and the mortar penetrates into the rock mass along the cracks, so that the bearing capacity of the rock stratum anchor rod is improved, and the method is particularly suitable for supporting the high-stress hard rock.
The multidirectional energy-gathering pipe 1 is made of PVC materials and is hollow inside; the taper angle of the groove bottom of the energy-collecting groove 9 is 60 degrees.
When the blast hole gun is in work, explosives are placed in the hollow part of the multidirectional energy-gathering pipe, after the blast hole is detonated at the bottom of a hole, explosive shock waves are unloaded in the direction of the energy-gathering groove firstly, the explosives near the energy-gathering groove generate energy-gathering jet flow with high energy density, strong impact is preferentially carried out on rock on the hole wall opposite to the energy-gathering direction, rock in the near area of the blast hole wall is subjected to rapid change, plastic damage is rapidly generated, and then long cracks are generated in the energy-gathering direction firstly; when the detonation gas permeates into the long cracks, the short cracks in other directions are closed and can not be expanded, the cracks are driven to be rapidly expanded into 4 main cracks under the quasi-static pressure action of the detonation gas, and jet flow formed by an energy-gathering structure has a strong penetration effect, so that the radial main cracks of the hole wall are ensured to be cracked and expanded only in a preset direction, and the strain peak values of other parts around the hole wall are greatly reduced, on one hand, the energy of blasting preferentially expands the formed weak-plane cracks, the cracking range of rocks is enlarged, and grout is favorably injected into the interior of a rock body; on the other hand, the generation of a large number of random cracks and the strong damage to the hole wall are avoided, the relative stability of the surrounding rock is favorably kept, and the energy collecting pipe is directly gasified when exploding due to the fact that the PVC material has the mechanical strength of normal use, and the subsequent operation cannot be influenced.
The fixing component consists of a nut 6, a backing plate 7 and a grout stop plug 5; the nut 6 is located the outermost end of cavity slip casting stock, nut 6, backing plate 7 and end thick liquid stopper 5 connect gradually on the cavity slip casting stock other end.
As shown in fig. 1 and 2, the utility model also provides an adopt multidirectional specific implementation mode that gathers the novel cavity slip casting stock that the blasting sent and splits of gathering:
drilling, drilling an anchor rod hole with a certain depth at a designed hole position according to supporting requirements, then adding water into high-pressure air to clean the hole, and removing sundries such as broken stones and rock powder in the hole.
Secondly, charging, calculating the dosage according to the properties of surrounding rocks, filling a proper amount of explosive 10 into the multidirectional energy-gathering tube 1, then inserting the detonator into the center position of the interior from the top end of the multidirectional energy-gathering tube 1, then connecting the multidirectional energy-gathering tube 1 with the anchor head 3 through the connecting sleeve 2, and leading the detonating cord out along the hollow channel of the anchor rod body after penetrating through the circular through hole of the connecting sleeve 2.
Inserting a hollow grouting anchor rod, inserting the hollow grouting anchor rod filled with explosive into the anchor rod hole, placing the multidirectional energy-gathering pipe end into the bottom, and then installing a grout stop plug 5, a backing plate 7 and a nut 6.
And fourthly, detonating the multidirectional energy-gathering pipes outside the safe distance, forming energy-gathering jet flow in the directions of the 4 energy-gathering grooves 9, directly impacting the rock mass around the pipe column by the high-energy jet flow to generate a fracturing range with a certain depth, releasing stress concentration in the deep part of the rock mass at the fracture part to a certain degree, and reducing the probability of rock burst.
And fifthly, the multi-directional energy-collecting pipe 1 is gasified instantly by high temperature generated by fixing the anchor rod and explosion, the hollow grouting anchor rod is inserted forwards to enable the anchor head 3 to reach the bottom of the hole, and the hollow grouting anchor rod is reassembled and fixed.
And step six, connecting a grouting machine, and connecting the tail end of the anchor rod with the grouting machine through a quick grouting connector.
And step seven, grouting and starting a machine to start grouting, wherein the grout firstly compacts the surrounding rock mass along with the increase of grouting pressure, and when the pressure reaches a certain degree, the grout is pressed into the blasting cracks to form a vein-shaped or strip-shaped cementing body, so that the anchoring area of the anchor rod is enlarged, and the overall supporting strength of the rock mass is improved.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The utility model provides an adopt multidirectional energy gathering blasting to send novel cavity slip casting stock that splits which characterized in that includes:
the energy collecting device comprises a multidirectional energy collecting pipe, wherein 4 energy collecting grooves which are recessed inwards in the radial direction and have the same size are uniformly arranged on the outer wall of the multidirectional energy collecting pipe, and the cross section of each energy collecting groove is in a V shape;
one end of the coupling sleeve is connected with the multidirectional energy-gathering pipe, and a circular through hole is formed in the center of the coupling sleeve;
the hollow grouting anchor rod is provided with a conical anchor head at one end, and the anchor head is connected with the other end of the connecting sleeve; the other end of the hollow grouting anchor rod is provided with a fixing component; the middle of the fixing component and the anchor head is provided with an anchor rod body of the hollow grouting anchor rod, and a hollow pore passage is arranged inside the anchor rod body.
2. The novel hollow grouting anchor rod adopting multidirectional energy-gathering blasting fracturing as claimed in claim 1, wherein the multidirectional energy-gathering pipe is made of PVC and is hollow inside.
3. The new type hollow grouting anchor rod adopting multidirectional energy-gathering blasting to crack according to claim 1, characterized in that the taper angle of the bottom of the energy-gathering groove is 60 degrees.
4. The novel hollow grouting anchor rod adopting multidirectional energy-gathering blasting fracturing as claimed in claim 1, wherein the fixing assembly is composed of a nut, a backing plate and a grout stop plug.
5. The novel hollow grouting anchor rod adopting multidirectional energy-gathered blasting fracturing as claimed in claim 4, wherein the nut is located at the outermost end of the hollow grouting anchor rod, and the nut, the backing plate and the grout stop plug are sequentially connected to the other end of the hollow grouting anchor rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020917793.4U CN212508374U (en) | 2020-05-27 | 2020-05-27 | Novel hollow grouting anchor rod adopting multidirectional energy-gathering blasting and fracturing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020917793.4U CN212508374U (en) | 2020-05-27 | 2020-05-27 | Novel hollow grouting anchor rod adopting multidirectional energy-gathering blasting and fracturing |
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| CN212508374U true CN212508374U (en) | 2021-02-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114719697A (en) * | 2022-04-22 | 2022-07-08 | 湖南楚湘建设工程集团有限公司 | Blasting device, blasting system and blasting method based on self-propelled anchor rod |
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2020
- 2020-05-27 CN CN202020917793.4U patent/CN212508374U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114719697A (en) * | 2022-04-22 | 2022-07-08 | 湖南楚湘建设工程集团有限公司 | Blasting device, blasting system and blasting method based on self-propelled anchor rod |
| CN114719697B (en) * | 2022-04-22 | 2023-12-15 | 湖南楚湘建设工程集团有限公司 | Blasting device, blasting system and blasting method based on self-advancing anchor rod |
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