Hollow anchor rod structure and supporting construction method thereof

Abstract

The application discloses a hollow anchor rod structure and a supporting construction method thereof, and comprises an anchor rod end, which comprises an outer end sleeve, an inner end sleeve and a connecting head, the end of the inner end sleeve is a conical structure, the remaining part of the inner end sleeve is a hollow cylindrical structure, the outer end sleeve is coaxially arranged outside the inner end sleeve, the end of the outer end sleeve is a conical structure, the remaining part of the outer end sleeve is a cylindrical structure with gradually decreasing diameter from the tail to the end, the interlayer space formed between the outer end sleeve and the inner end sleeve gradually decreases in volume from the tail to the end, and the outer end sleeve and the inner end sleeve are connected into a whole through the connecting head; a high-pressure gas pipe is coaxially arranged on the connecting head. The application has the advantages of convenient on-site construction, improved construction efficiency, stable connection of the hollow anchor rod and the grouting pipe ensured by the grouting quick connector, the grouting pressure required by grouting can be reached, the grouting quality is ensured, and the safety of on-site construction is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tunnel construction. BACKGROUND

[0002] In the process of tunnel construction, due to the free surface formed after excavation, the surrounding rock stress is large, and for relatively broken surrounding rock, the self-stability is poor, which is easy to cause large convergence, so it is necessary to set up hollow anchor rod grouting to consolidate the surrounding rock, therefore, a large grouting pressure is required, and the connection between the hollow anchor rod and the grouting pipe is a weak part during the on-site construction process, which is easy to leak grouting under the condition of large grouting pressure, and the connection is not convenient during the construction process, therefore, a quick connector for tightly connecting the hollow anchor rod and the grouting pipe needs to be researched. SUMMARY

[0003] The purpose of the present application is to provide a hollow anchor rod structure and a supporting construction method, which is convenient for on-site construction, improves the construction efficiency, and ensures the stability of the connection between the hollow anchor rod and the grouting pipe through the grouting quick connector, so as to achieve the required grouting pressure and ensure the grouting quality and the safety of on-site construction.

[0004] Another purpose of the present application is to provide an innovative hollow anchor rod structure, which accelerates the rotation speed of high-pressure gas at the end head during rotary drilling, performs high-strength airflow stamping on the early-strength anchoring agent, extrudes the early-strength anchoring agent through high-pressure rotational flow gas, fills and densifies the early-strength anchoring agent in the anchor rod hole, and forms a high-pressure gas layer around the gas outlet pipe to prevent the gas outlet pipe from being blocked.

[0005] The technical solution adopted by the present application to solve the technical problem is: a hollow anchor rod structure, comprising:

[0006] The anchor rod end head comprises an outer end sleeve, an inner end sleeve and a connecting head, the end head of the inner end sleeve is a conical structure, the remaining part of the inner end sleeve is a hollow cylindrical structure, the outer end sleeve is coaxially arranged outside the inner end sleeve, the end head of the outer end sleeve is a conical structure, the remaining part of the outer end sleeve is a cylindrical structure with gradually decreasing diameter from the tail to the end head, the interlayer space formed between the outer end sleeve and the inner end sleeve gradually decreases in volume from the tail to the end head, and the outer end sleeve and the inner end sleeve are connected as a whole through the connecting head; a high-pressure gas pipe is coaxially arranged on the connecting head, the high-pressure gas pipe penetrates into the inner end sleeve, a plurality of gas holes are arranged in an array on the outer wall of the inner end sleeve, a drainage cover is fixed to the outer wall of the inner end sleeve, and a plurality of gas outlet pipes are connected in an array on the outer wall of the outer end sleeve, the gas outlet pipes are tangentially arranged on the outer wall of the outer end sleeve and communicate with the inside of the outer end sleeve;

[0007] The anchoring section is a hollow grouting section, the anchoring section is connected with the anchor rod end head through a sleeve joint section, the high-pressure gas pipe is coaxially inserted into the end head of the anchoring section, and the anchoring section and the sleeve joint section are both provided with grouting holes.

[0008] Preferably, a drainage cover is arranged on one side of the tail part of the same circumferential gas hole, the drainage cover is coaxially fixed to the outer wall of the inner end sleeve in an umbrella structure, the opening of the drainage cover close to the end head is larger than the opening of the drainage cover close to the tail part, and one side of the end head of the drainage cover has a gap with the outer end sleeve.

[0009] Preferably, the connection between the gas outlet pipe and the outer end sleeve is in a circular arc transition.

[0010] Preferably, a cutter disc arranged in a spiral is fixed to the end head of the outer end sleeve.

[0011] Preferably, the application further comprises a fixing nut and a backing plate.

[0012] The fixing nut is screwed to the tail end of the anchoring section, the backing plate is arranged on the end head of the fixing nut through a gasket, the backing plate is arranged on the rock surface of the anchor rod hole, and an exhaust pipe is arranged on the backing plate.

[0013] The application further provides a construction method using the hollow anchor rod structure, comprising the following steps.

[0014] 1) A drilling trolley drills an anchor rod hole in a rock body, and timely hole cleaning is performed to sweep away small stone chippings in the drilling hole;

[0015] 2) Early strength anchoring agent is delivered to the deep part of the anchor rod hole;

[0016] 3) The hollow anchor rod structure is assembled, and the hollow anchor rod is installed by rotating through the drilling trolley, high-pressure gas is continuously supplied to the high-pressure gas pipe during the installation process, the early strength anchoring agent is fully stirred through the high-pressure gas and the end head of the outer end sleeve, and the early strength anchoring agent is filled and compacted in the anchor rod hole through the high-pressure rotational flow gas;

[0017] 4) After the early strength anchoring body reaches the required strength, the backing plate, the gasket and the fixing nut are installed on the rock surface, and the exhaust pipe is installed on the backing plate;

[0018] 5) Grouting is performed, the grout pressure reaches the design value, and grouting is completed when the grout overflows from the exhaust hole;

[0019] 6) The hollow anchor rod quick connector is removed, and the next hollow anchor rod construction is circularly performed.

[0020] The application at least has the following beneficial effects:

[0021] 1) The hollow anchor rod structure of the present application is in a process of rotary drilling, the rotating speed of high-pressure gas at the end is accelerated, the early strength anchoring agent is subjected to high-strength airflow stamping, the early strength anchoring agent is extruded by high-pressure rotational flow gas, the early strength anchoring agent is filled and compacted in the anchor rod hole, and a high-pressure gas layer is formed around the gas outlet pipe to prevent the gas outlet pipe from being blocked.

[0022] 2) The connection between the gas outlet pipe and the outer end sleeve is circular arc transition, the high-pressure airflow is in rotational flow state when flowing out from the outer end sleeve to the gas outlet pipe, and the extrusion and compaction of the early strength anchoring agent by the high-pressure airflow are improved.

[0023] 3) When the anchor rod end is rotated into the anchor rod hole, the cutter disc arranged on the outer end sleeve serves as an auxiliary rotary cutting tool to uniformly stir the early strength anchoring agent and extrude and compact the early strength anchoring agent to both sides of the anchor rod hole and the end, so that the early strength anchoring agent is prevented from being loosely attached to the anchor rod hole to affect the supporting force of the hollow anchor rod structure.

[0024] Other advantages, objects and features of the present application will be partly embodied in the following description, and will be partly understood by those skilled in the art through research and practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a structural schematic view of the hollow anchor rod structure of the present application;

[0026] Fig. 2 is a sectional view of the outer end sleeve of the present application;

[0027] Fig. 3 is a structural schematic view of the grouting quick connector of the present application.

[0028] Explanation of reference signs: 1 outer end sleeve, 2 inner end sleeve, 3 connecting head, 4 high-pressure gas pipe, 5 drainage cover, 6 gas outlet pipe, 7 early strength anchoring agent, 8 circular arc transition, 9 anchoring section, 10 sleeving section, 11 cutter disc, 12 fixed nut, 13 pad, 14 exhaust pipe, 15 first connecting nut, 16 middle connecting pipe, and 17 second connecting nut. DETAILED DESCRIPTION

[0029] The present application will be described in detail and completely below with reference to the drawings. Those skilled in the art will be able to implement the present application based on these descriptions. Before the present application is described in detail with reference to the drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the present application, including the following description, can be combined with each other without conflict.

[0030] In addition, the embodiments of the present application involved in the following description are generally only a part of the embodiments of the present application, rather than all the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor should belong to the scope of protection of the present application.

[0031] The present application will be further described in detail below in combination with the drawings and embodiments, and the specific implementation process is as follows:

[0032] As shown in Figs. 1-3 , the present application provides a hollow anchor rod structure, comprising:

[0033] The anchor rod head comprises an outer end sleeve 1, an inner end sleeve 2 and a connecting head 3, the end of the inner end sleeve 2 is a conical structure, the remaining part of the inner end sleeve 2 is a hollow cylindrical structure, the outer end sleeve 1 is coaxially arranged outside the inner end sleeve 2, the end of the outer end sleeve 1 is a conical structure, the remaining part of the outer end sleeve 1 is a cylindrical structure with gradually decreasing diameter from the tail to the head, the interlayer space formed between the outer end sleeve 1 and the inner end sleeve 2 gradually decreases in volume from the tail to the head, and the outer end sleeve 1 and the inner end sleeve 2 are connected as a whole through the connecting head 3; a high-pressure gas pipe 4 is coaxially arranged on the connecting head 3, the high-pressure gas pipe 4 penetrates into the inner end sleeve 2, a plurality of gas holes are arranged in an array on the outer wall of the inner end sleeve 2, a drainage cover 5 is fixed on the outer wall of the inner end sleeve 2, and a plurality of gas outlet pipes 6 are connected in an array on the outer wall of the outer end sleeve 1, the gas outlet pipes 6 are tangentially arranged on the outer wall of the outer end sleeve 1 and communicate with the inside of the outer end sleeve 1.

[0034] The anchoring section 9 is a hollow grouting section, the anchoring section 9 is connected with the anchor rod head through the sleeving section 10, the high-pressure gas pipe 4 penetrates into the end of the anchoring section 9 coaxially, and the anchoring section 9 and the sleeving section 10 are both provided with grouting holes.

[0035] The hollow anchor rod structure of the present application is in a process of rotary drilling, the rotating speed of the high-pressure gas at the end is accelerated, the early strength anchoring agent 7 is subjected to high-intensity airflow stamping, the early strength anchoring agent 7 is extruded by high-pressure rotational flow gas, so that the early strength anchoring agent 7 is filled and compacted in the anchor rod hole, in addition, a high-pressure gas layer is formed around the gas outlet pipe 6 to prevent the gas outlet pipe 6 from being blocked.

[0036] The technical solution can further include the following technical details to better achieve the technical effect: the gas holes in the same circumferential direction are provided with a drainage cover 5 on one side of the tail, the drainage cover 5 is coaxially fixed on the outer wall of the inner end sleeve 2 in an umbrella-shaped structure, the opening of the drainage cover 5 close to the end is larger than the opening of the drainage cover 5 close to the tail, and one side of the end of the drainage cover 5 has a certain gap with the outer end sleeve 1.

[0037] The technical scheme can further include the following technical details to better achieve the technical effects: the connection between the air outlet pipe 6 and the outer end sleeve 1 is in a circular arc transition 8, which ensures that the high-pressure airflow flows out of the outer end sleeve 1 to the air outlet pipe 6 in a spiral flow state, and the high-pressure airflow improves the extrusion and compaction of the early strength anchoring agent 7.

[0038] The technical scheme can further include the following technical details to better achieve the technical effects: the end of the outer end sleeve 1 is fixed with a cutter head 11 arranged in a spiral, and when the anchor rod end is rotated into the anchor rod hole, the cutter head 11 arranged on the outer end sleeve 1 serves as an auxiliary rotary cutting tool to uniformly mix and extrude and compact the early strength anchoring agent 7 to both sides and the end of the anchor rod hole, thereby preventing the early strength anchoring agent 7 from being loosely attached to the anchor rod hole to affect the supporting force of the hollow anchor rod structure.

[0039] The technical scheme can further include the following technical details to better achieve the technical effects: further including a fixing nut 12, a backing plate 13, and a grouting quick connector;

[0040] The fixing nut 12 is screwed to the tail end of the anchoring section 9, the backing plate 13 is arranged on the end of the fixing nut 12 through a gasket, the backing plate 13 is arranged to fit the rock surface of the anchor rod hole, and the backing plate 13 is provided with an exhaust pipe 14.

[0041] The grouting quick connector includes a first connecting nut 15, a middle connecting pipe 16, and a second connecting nut 17 that are sequentially screwed, and when grouting is needed, the first connecting nut 15 of the grouting quick connector is screwed to the tail of the anchoring section 9, grouting is performed after checking that the connection is complete, grouting is completed when the slurry pressure reaches the design value and the slurry overflows from the exhaust hole, the grouting quick connector is removed, and the next hollow anchor rod structure construction is performed in a cycle.

[0042] The application also provides a hollow anchor rod structure support construction method, which is characterized by comprising the following steps:

[0043] 1) drilling a hole in the rock mass with a drilling jumbo, and promptly cleaning the hole to remove small stone chips;

[0044] 2) delivering early strength anchoring agent 7 to the deep part of the anchor rod hole;

[0045] 3) assembling the hollow anchor rod structure and rotating and installing the hollow anchor rod through the drilling jumbo, continuously supplying high-pressure gas to the high-pressure gas pipe 4 during the installation process, fully mixing the early strength anchoring agent 7 through the high-pressure gas and the end of the outer end sleeve 1, extruding the early strength anchoring agent 7 through the high-pressure spiral flow gas, and filling and compacting the early strength anchoring agent 7 in the anchor rod hole;

[0046] 4) after the early strength anchoring body reaches the required strength, installing the backing plate 13, the gasket, and the fixing nut 12 on the rock surface, and installing the exhaust pipe 14 on the backing plate 13;

[0047] 5) Grouting is carried out, the slurry pressure reaches the design value, and the grouting is completed when the slurry overflows from the exhaust hole;

[0048] 6) The hollow anchor rod quick connector is removed, and the next hollow anchor rod construction is cycled.

[0049] While the embodiments of the application have been disclosed in connection with the above specification and drawings, it will be understood that it is not intended to limit the application to the details of the application disclosed herein, but rather this application is intended to be taken as including all such variations as come within the scope of the following claims, and that what is intended to be protected by patent rights is set forth in the claims.

Claims

1. A hollow anchor rod structure, characterized by, The utility model relates to a hollow anchor rod structure and its construction method, including: Anchor rod end head, including outer end sleeve, inner end sleeve and connecting head, the end head of inner end sleeve is conical structure, the remaining part of inner end sleeve is hollow cylindrical structure, the outer end sleeve is coaxially arranged in the outside of inner end sleeve, the end head of outer end sleeve is conical structure, the remaining part of outer end sleeve is cylindrical structure gradually reducing in diameter from tail to end head, the interlayer space formed between outer end sleeve and inner end sleeve gradually reduces in volume from tail to end head, outer end sleeve and inner end sleeve are connected as a whole through connecting head, high-pressure gas pipe is coaxially arranged on connecting head, high-pressure gas pipe penetrates into inner end sleeve, a plurality of gas holes are arranged in array on the outer wall of inner end sleeve, a drainage cover is fixed on the outer wall of inner end sleeve, the drainage cover is coaxially fixed on the outer wall of inner end sleeve and is in umbrella structure, the opening of drainage cover near the end head is larger than the opening of drainage cover near the tail, one side of the end head of drainage cover has a certain gap with outer end sleeve, the connecting place of gas outlet pipe and outer end sleeve is circular arc transition, the end head of outer end sleeve is fixed with cutter head arranged in spiral; A plurality of gas outlet pipes are connected in array on the outer wall of outer end sleeve, the gas outlet pipes are tangentially arranged on the outer wall of outer end sleeve and are in communication with the inside of outer end sleeve; The anchor segment is a hollow grouting segment, the anchor segment is connected with the anchor rod end head through the sleeve joint segment, the high-pressure gas pipe is coaxially penetrated into the end head of anchor segment, and the anchor segment and sleeve joint segment are all provided with grouting holes; Fixed nut and backing plate, the fixed nut is screwed on the tail end of anchor segment, the backing plate is arranged on the end head of fixed nut through the washer, the backing plate is arranged on the rock surface of anchor rod hole, and the exhaust pipeline is arranged on the backing plate.

2. A hollow anchor rod structure according to claim 1, characterized in that The gas holes in the same circumferential direction are arranged with one drainage cover on one side of the tail.

3. A method for supporting construction using the hollow anchor rod structure according to any one of claims 1 to 2, characterized by, The utility model relates to a hollow anchor rod structure and its construction method, including the following steps: 1) drilling jumbo drills anchor rod hole in rock mass, and promptly cleans hole, and sweeps small stone chippings in the drilling hole in time; 2) early strength anchoring agent is delivered in the deep part of anchor rod hole; 3) hollow anchor rod structure is assembled, and the hollow anchor rod is installed by drilling jumbo, and high-pressure gas is continuously input into high-pressure gas pipe during installation, and early strength anchoring agent is fully stirred by high-pressure gas and the end head of outer end sleeve, and early strength anchoring agent is extruded by high-pressure rotational flow gas, so that early strength anchoring agent is filled and dense in anchor rod hole; 4) after early strength anchoring body reaches the required strength, install backing plate, washer and fixed nut on rock surface, and install exhaust pipeline on backing plate; 5) grouting, and grouting is finished when slurry pressure reaches design value and overflows from exhaust hole; 6) remove hollow anchor rod quick connector, and the next hollow anchor rod construction is circularly carried out.

Images