A drill bit assembly for an anchor rod, an anchor rod structure, and a method of using an anchor rod structure

Abstract

The application relates to the field of anchor rods, in particular to an anchor rod drill head assembly 1, an anchor rod structure and a use method of the anchor rod structure, which comprises a drill head body and a drill head assembly; an assembly through hole is arranged on the drill head body, and the drill head assembly is arranged in the drill head body through the assembly through hole; an outer blade is arranged on the drill head body; the application discloses an anchor rod drill head assembly 1; the drill head assembly 1 disclosed by the application can realize the opening of an anchor rod hole; meanwhile, a subsequent anchor rod structure can be fixed in the anchor rod hole in cooperation with an anchoring agent; meanwhile, the drill head assembly 1 disclosed by the application also has the function of a scraper, can realize the unsealing and subsequent stirring of the anchoring agent, and has excellent use effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of anchor rods, in particular to a drill bit assembly for anchor rods, an anchor rod structure and a method for using the anchor rod structure. BACKGROUND

[0002] Currently, when constructing an anchor rod in soft rock tunnel, a drill rod is first used to drill a hole, then the drill rod is withdrawn, the hole is cleaned by high pressure air or water, and then a resin anchoring cartridge is inserted; and then the anchor rod is inserted.

[0003] The resin anchoring cartridge is broken by rotating the anchor rod, so that it is fully mixed and wrapped around the rod body, and is quickly anchored and bonded to the hole wall (within 1 minute), thereby achieving the effect of immediate anchoring.

[0004] The above operation has the following problems: when the surrounding rock is loose and broken, the anchor rod hole is prone to collapse after the drill rod is removed, and the resin anchoring cartridge and the anchor rod are difficult to insert.

[0005] To solve this problem, a self-drilling anchor rod has been developed.

[0006] The self-drilling hollow anchor rod mainly consists of a self-drilling drill bit, a hollow rod body, a connecting sleeve (as needed), a pad, a washer and a nut, etc.

[0007] The main feature of the self-drilling anchor rod is that it has a self-drilling drill bit, which is a disposable drill bit, and the anchor rod body is a hollow rod body, so the anchor rod has the function of a drill rod. After the anchor rod is drilled to the designed depth, grouting can be carried out through the hollow rod body. The grout is generally cement grout, which flows out of the openings of the drill bit, rod body, connecting sleeve, etc. to fill the gap between the anchor rod and the anchor rod hole.

[0008] After the grout solidifies, the anchor rod is anchored in the surrounding rock.

[0009] The problem with the above self-drilling anchor rod is that the grout is generally cement grout, which solidifies slowly, usually taking 18-24 hours to develop strength, at which time the anchor rod can bear load. Therefore, it has the problems of poor anchoring timeliness, poor anchoring effect and inability to apply prestress immediately, which cannot meet the needs of early support in soft rock tunnels.

[0010] In order to improve the above problems, it is necessary to optimize the design of the existing anchor rod structure. SUMMARY

[0011] The purpose of the present application is to provide an anchor rod drill bit structure that does not need to be removed after being drilled, and can realize subsequent anchoring agent placement.

[0012] In order to achieve the above purpose, the technical solution adopted by the present application is as follows:

[0013] A drill bit assembly for anchor rod, comprising a drill bit body and a drill bit assembly; the drill bit body is provided with an assembly through hole, and the drill bit assembly is installed inside the drill bit body through the assembly through hole; the drill bit body is provided with an outer blade.

[0014] A positioning mechanism is arranged between the drill bit assembly and the drill bit body, and the positioning mechanism comprises a first positioning part; the first positioning part comprises a positioning protrusion arranged on the drill bit assembly; a positioning recess is arranged on the inner wall of the assembly through hole; and the positioning protrusion is clamped in the positioning recess.

[0015] The positioning mechanism further comprises a second positioning part, which comprises a protruding spike arranged on the inner wall of the assembly through hole and a spike-shaped groove arranged on the outer side of the drill bit assembly; the protruding spike and the spike-shaped groove are matched with each other.

[0016] The drill bit body is provided with a side exhaust hole, and the drill bit assembly is provided with an end exhaust hole.

[0017] The drill bit assembly is subjected to magnetization treatment, and the drill bit assembly is adsorbed inside the drill bit body.

[0018] An anchor rod structure, comprising a hollow rod body, the hollow rod body is provided with a drill bit assembly at the end; the hollow rod body and the drill bit body in the drill bit assembly are connected through threads.

[0019] The hollow rod body is provided with a backing plate, the backing plate is provided with a grout stopper near one side of the drill bit assembly, and the grout stopper is sleeved on the hollow rod body.

[0020] The hollow rod body is provided with a sealing ball.

[0021] A use method of an anchor rod structure, the use method comprising the following steps:

[0022] Step 1: connect the hollow rod body with the anchor rod drilling machine, and align the anchor rod with the anchor rod hole design position;

[0023] Step 2: start the anchor rod drilling machine, and realize anchor rod drilling under the action of the anchor rod assembly; until the anchor rod hole after drilling meets the design requirements;

[0024] Step 3: after step 2 is completed, blow high-pressure air from one end of the hollow rod body away from the drill bit assembly; so that the high-pressure air blows off the drill bit assembly from the drill bit body;

[0025] Step 4: after step 3 is completed, insert the resin roll anchor agent from one end of the hollow rod body away from the drill bit assembly; blow the corresponding amount of anchor agent according to the design requirements;

[0026] Step 5: after step 4 is completed, the anchor rod drill is started, and the drill bit body and the rod body are used to pierce, mix and stir the resin roll anchoring agent; after the anchoring agent is hardened, the end anchor effect is formed, so that the drill bit and the nearby rod body are firmly bonded on the anchor rod hole;

[0027] Step 6: after step 5 is completed, the stop plug, the gasket plate and the nut are installed, the nut is tightened, the rod body is tensioned, and the rod body is pre-stressed, so that the gasket plate is pressed against the surrounding rock to achieve the effect of immediate reinforcement and support.

[0028] After step 6 is completed, grouting is carried out in the anchor rod hole and the hollow rod body, and the grout fills the space between the anchor rod and the anchor hole.

[0029] The advantages of the present application are:

[0030] The present application discloses a drill bit assembly for anchor rod, the drill bit assembly disclosed by the present application can realize the opening of the anchor rod hole, meanwhile, the subsequent assembled anchor rod structure can be fixed in the anchor rod hole in cooperation with the anchoring agent, and the drill bit assembly disclosed by the present application also has the function of a scraper, can realize the opening and subsequent stirring of the anchoring agent, and has excellent use effect. BRIEF DESCRIPTION OF DRAWINGS

[0031] The content expressed by each drawing of the present application and the marks in the drawings are briefly described as follows:

[0032] Figure 1 It is a structural schematic view of the drill bit assembly in the present application.

[0033] Figure 2 It is a structural schematic view of the drill bit body in the present application.

[0034] Figure 3 It is a structural schematic view of the drill bit assembly in the present application.

[0035] Figure 4 It is a structural schematic view of the drill bit assembly and the drill bit body in the present application.

[0036] Figure 5 It is a structural schematic view of the anchor rod structure in the present application.

[0037] The marks in the above drawings are as follows:

[0038] 1, drill bit assembly, 2, hollow rod body, 3, connecting sleeve, 4, stop plug, 5, gasket plate, 6, nut, 7, sealing ball. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application are further described in detail below by comparing the drawings and describing the optimal embodiments.

[0040] The utility model provides an anchor rod drill head assembly, including drill head body 11 and drill head assembly 12, be equipped with assembly through -hole 115 on drill head body 11, drill head assembly 12 is installed in drill head body 11 inside through assembly through -hole 115, be equipped with outer blade 113 on drill head body 11, the utility model discloses an anchor rod drill head assembly 1, the drill head assembly 1 disclosed in the utility model can realize the setting of anchor rod hole, simultaneously, the anchor rod structure of subsequent assembly can cooperate anchor agent and fix in anchor rod hole, simultaneously the drill head assembly 1 disclosed in the utility model also has the function of cutter, can realize the unsealing of subsequent anchor agent and subsequent stirring, has very good use effect.

[0041] Specifically, the drill head assembly 1 disclosed in the utility model is a subcomponent of an anchor rod structure. In actual use, the basic function is to bear the hole opening function. Due to the structural design of the drill head assembly 1, the drill head assembly 1 not only has the hole opening function. In the utility model, the drill head assembly 1 mainly includes a drill head body 11. The state body is the external structure of the drill head assembly 1 and is mainly used for hole opening in subsequent use. After the subsequent anchor agent is put in, the drill head body 11 can break the anchor agent package due to the internal structure design. The outer side of the drill head body 11 is provided with an outer blade 113. The outer blade 113 plays a hole opening role and also plays a good breaking role. It is also convenient to break and stir the anchor agent subsequently. In addition, the drill head body 11 is provided with an assembly through -hole 115 in the utility model. The assembly through -hole 115 facilitates the assembly of the drill head assembly. Specifically, the drill head assembly 12 is installed in the drill head body 11 through the assembly through -hole 115. At the same time, the assembly through -hole 115 facilitates the separation of the drill head assembly 12 from the drill head body 11 under the blowing of high-pressure gas flow in subsequent use, which facilitates the subsequent putting of the anchor agent. In addition, the drill head body 11 is provided with an outer blade 113 in the utility model. The outer blade 113 plays a cutting role, facilitates the hole opening of the drill head, and facilitates the subsequent breaking of the anchor agent.

[0042] Further, the drill head assembly 12 and the drill head body 11 are provided with a positioning mechanism in the utility model. The positioning mechanism includes a first positioning part. The first positioning part facilitates the rotational linkage between the drill head assembly 12 and the drill head body 11, that is, the drill head assembly 12 and the drill head body 11 can act synchronously to realize the hole opening operation in the hole opening operation. Specifically, the first positioning part includes a positioning protrusion 121 arranged on the drill head assembly 12. A positioning recess is arranged on the inner wall of the assembly through -hole 115. The positioning protrusion 121 is clamped in the positioning recess. The positioning recess and the positioning protrusion 121 are matched to realize the connection and positioning between the drill head assembly 12 and the drill head body 11. In addition, as a greater optimization, the positioning protrusion 121 and the positioning recess are both square structures, which play a good self-limiting role.

[0043] Further, the positioning mechanism in the application further comprises a second positioning part, which comprises a protruding spike 112 arranged on the inner wall of the assembly through hole 115 and a spike-shaped groove 122 arranged on the outer side of the drill bit assembly 12; the protruding spike 112 cooperates with the spike-shaped groove 122; the secondary positioning of the drill bit assembly 12 and the drill bit body 11 is realized, in addition, the protruding spike 112 in the application also functions as a breaking head in subsequent use, facilitating the breaking of the outside of the anchoring agent and realizing the overflow of the anchoring agent, in addition, the protruding spike 112 is arranged obliquely in the application, which can better realize the lateral limiting of the drill bit assembly 12 and the drill bit body 11 and better avoid the relative rotation of the drill bit assembly 12 and the drill bit body 11.

[0044] Further, the drill bit body 11 in the application is provided with a side exhaust hole 114, and the drill bit assembly 12 is provided with an end exhaust hole 124; through the design of the side exhaust hole 114 and the end exhaust hole 124, the subsequent high-pressure air is matched, in the drilling process, the airflow input through the hollow rod body 2 can enter the anchor rod hole through the side exhaust hole 114 and the end exhaust hole 124, promoting the slag discharge and hole cleaning operation.

[0045] Further, the drill bit assembly 12 in the application is subjected to magnetization treatment, and the drill bit assembly 12 is adsorbed inside the drill bit body 11; through such design, the mutual positioning between the drill bit assembly 12 and the drill bit body 11 is facilitated, not only the transportation of the drill bit assembly 12 and the drill bit body 11 is facilitated, but also the pre-positioning of the drill bit assembly 12 and the drill bit body 11 is realized, facilitating the overall connection of the drill bit assembly 1 at the end of the anchor rod.

[0046] An anchor rod structure comprises a hollow rod body 2, the end of which is provided with a drill bit assembly 1; the hollow rod body 2 and the drill bit body 11 in the drill bit assembly 1 are connected through threads; through such design, the connection between the hollow rod body 2 and the drill bit assembly 1 is facilitated, in addition, the anchor rod structure disclosed above in the application can realize the opening of the anchor rod hole, and the drill bit assembly 1 is designed as a separable structure, facilitating the subsequent pouring of the anchoring agent.

[0047] Further, the hollow rod body 2 in the application is provided with a backing plate 5, the side of which close to the drill bit assembly 1 is provided with a grout stopper 4, which is sleeved on the hollow rod body 2; through the arrangement of the grout stopper 4, a good plugging effect is realized, facilitating the plugging of the grout stopper 4 to the anchor rod hole.

[0048] Further, the hollow rod body 2 is provided with a sealing ball 7 in the application; the sealing ball 7 is made of high-elastic heavy sponge, is inserted into the rod body end after the drilling construction is completed, is pushed to the vicinity of the drill bit by high-pressure air, blocks the side exhaust hole 114 and the end exhaust hole 124, forms a local high air pressure in the vicinity of the drill bit, and extrudes the drill bit assembly 12 with magnetism from the drill bit body 11 under the action of high-pressure pulse air.

[0049] A method for using an anchor rod structure, the method comprising the steps of:

[0050] Step 1: connect the hollow rod body 2 with the anchor rod drilling machine, and align the anchor rod with the anchor rod hole design position;

[0051] Step 2: start the anchor rod drilling machine, realize anchor rod drilling under the action of the anchor rod assembly, and until the anchor rod hole after drilling meets the design requirements;

[0052] Step 3: after step 2 is completed, blow high-pressure air from the end of the hollow rod body 2 away from the drill bit assembly 1; so that the high-pressure air blows the drill bit assembly 12 from the drill bit body 11;

[0053] Step 4: after step 3 is completed, insert the resin roll anchoring agent from the end of the hollow rod body 2 away from the drill bit assembly 1; blow the corresponding number of anchoring agents according to the design requirements;

[0054] Step 5: after step 4 is completed, start the anchor rod drilling machine, rotate and advance at the same time, use the drill bit body 11 and the rod body to pierce, mix and stir the resin roll anchoring agent; so that the anchoring agent coagulates and hardens to form an end anchoring effect, so that the drill bit and the nearby rod body are firmly bonded on the anchor rod hole;

[0055] Step 6: after step 5 is completed, install the grout stopper 4, the backing plate 5 and the nut 6, tighten the nut 6 to tension the rod body, and apply pre-stress to the rod body, so as to extrude the surrounding rock through the backing plate 5 to achieve the effect of immediate reinforcement and support.

[0056] The application can realize the opening of the anchor rod hole, facilitate the pouring of the anchoring agent, and quickly generate adhesive force after the anchoring agent is broken to bond the end of the anchor rod and the surrounding rock.

[0057] Further, after step 6 is completed in the application, grouting is performed in the anchor rod hole and the hollow rod body 2 by the hollow rod body 2; the grout fills the entire space between the anchor rod and the anchor hole; the grouting is a conventional grouting operation, but the application can fill the entire anchor rod drilling hole by injecting from the hollow anchor rod end and flowing out from the grout outlet hole on the hollow rod body 2 after the grouting operation, and can play a role of full-length bonding of the anchor rod after coagulation and hardening, and improve the corrosion resistance of the anchor rod.

[0058] Specifically;

[0059] The anchor rod structure disclosed by the application mainly comprises a drill bit assembly 1, the drill bit assembly 1 disclosed by the application is a combined drill bit, the combined drill bit disclosed by the application is a split design, and the main purpose of the split design of the combined drill bit is to realize split separation after drilling is completed and to reserve space for subsequent pushing of anchoring agent.

[0060] The anchor rod structure disclosed by the application further comprises a hollow rod body 2, a connecting sleeve 3, a stop plug 4, a backing plate 5, a nut 6 and a sealing ball 7, and the connecting sleeve 3 and the stop plug 4 can be selectively used in the application.

[0061] In the application, the drill bit assembly 1 is internally provided with standard continuous threads, the hollow rod body 2 is externally provided with continuous standard threads, and the drill bit assembly 1 is connected with the hollow rod body 2 through threads.

[0062] The connecting sleeve 3 is a hollow sleeve, and the inner surface is provided with continuous standard threads, so that the two parts of the anchor rod body are connected through thread connection and play a bridging role.

[0063] The stop plug 4 is internally provided with standard continuous threads, and is connected with the hollow rod body 2 through threads.

[0064] The backing plate 5 is a square or circular flat backing plate 5 or a butterfly-shaped backing plate 5, and the backing plate 5 is provided with an anchor rod hole in the middle to allow the hollow rod body 2 to pass through.

[0065] The nut 6 is connected with the rod body through threads.

[0066] The sealing ball 7 is inserted into the end of the rod body after the anchor rod drilling is completed.

[0067] In the application, the drill bit assembly 1 mainly comprises a drill bit body 11 and a drill bit assembly body 12.

[0068] The inner wall of the drill bit body 11 is provided with positioning grooves 111 and protruding spurs 112 at intervals, and the outer wall of the drill bit assembly body 12 is provided with positioning protrusions 121 and spur-shaped grooves 122 at corresponding positions.

[0069] Since the drill bit assembly body 12 is provided with a space (assembly through hole 115) in the drill bit body 11, the drill bit assembly body 12 is connected with the drill bit body 11 through insertion along the length direction of the anchor rod.

[0070] In the drill bit assembly 1 of the present application, the main functions are as follows: (1) drilling; before conventional anchor rod installation, anchor rod hole needs to be made first, and after being emptied, the drill rod is taken out and then the anchor rod is put in; after the drill bit assembly 1 is installed on the hollow rod body 2, the anchor rod has the function of drilling, and after drilling is completed, it does not need to be taken out; (2) conveying anchoring agent; after the drill bit assembly 12 is separated from the drill bit body 11, the inner wall of the drill bit body 11 becomes a channel for conveying the anchoring agent; (3) mixing the anchoring agent; the drill bit body can fully mix the anchoring agent and firmly bond with it.

[0071] Specifically, the positioning groove 111 on the inner wall of the drill bit body 11 and the positioning protrusion 121 on the outer wall of the drill bit assembly 12 are engaged with each other, which functions to lock and limit when the anchor rod rotates, preventing the drill bit assembly 12 and the drill bit body 11 from slipping due to relative rotation, thereby ensuring that both can rotate and cut the rock and soil.

[0072] The protruding spike 112 on the inner wall of the drill bit body 11 and the spike-shaped groove 122 on the outer wall of the drill bit assembly 12 are engaged with each other, which has another function in addition to the similar locking and limiting function of 111 and 121: when the resin roll anchoring agent is pushed by high-pressure air from the inside of the rod body to the outside of the anchor rod, the protruding spike 112 can pierce the outer packaging of the anchoring agent, thereby facilitating the mixing of the two components inside the subsequent anchoring agent.

[0073] The drill bit body 11 and the drill bit assembly 12 are respectively provided with an outer blade 113 and an inner blade 123, which are made of the same steel material as the drill bit or a steel material with better performance, and their main functions are: (1) cutting the surrounding rock to form a drill hole during the rotation of the rod body; (2) after the anchoring agent is pushed, the drill bit body 11 and the outer blade 113 have another function of mixing the anchoring agent, making it evenly fill the entire anchor rod hole and be bonded to the hole wall.

[0074] In addition, the drill bit body 11 is provided with a side air outlet hole 114, and the drill bit assembly 12 is provided with an end air outlet hole 124; during drilling, the airflow input through the hollow rod body 2 can enter the anchor rod hole through the side air outlet hole 114 and the end air outlet hole 124, promoting slag removal and hole cleaning.

[0075] Hollow rod body 2: (1) as a drill rod; made of special steel material and heat treated, which can meet the mechanical performance requirements of the rod body as a drill rod; (2) the hollow rod body 2 inside can be used as a channel for conveying resin anchoring agent, high-pressure air and later grouting; (3) as a pressure relief element; the rod body is made of special steel material and heat treated, with high total elongation and yield strength under maximum force, and the rod body can allow itself to deform to a certain extent while maintaining a certain prestress, so the rod body has the function of prestress pressure relief.

[0076] Connecting sleeve 3: when the length of a single hollow rod body 2 is not enough, multiple rod bodies are connected to extend the length.

[0077] Plug 4: made of high-elasticity material such as rubber, with an inner diameter slightly smaller than the outer diameter of the rod body; the outer surface of the plug 4 is a circular truncated cone, with the small-diameter end having an outer diameter smaller than the diameter of the anchor hole and the large-diameter end having an outer diameter larger than the diameter of the anchor hole. After installation, the plug 4 tightly wraps around the rod body and seals the hole under the extrusion of the pad 5, thereby preventing the overflow of grouting material from the anchor hole.

[0078] Pad 5 and nut 6: necessary accessories for anchor installation, the pad 5 is extruded by rotating the nut 6, so that the pad 5 is tightly attached to the surface of the primary support and exerts a pre-stress on the surrounding rock.

[0079] Sealing ball 7: made of high-elasticity heavy sponge, inserted into the end of the rod body after the drilling is completed, pushed to the vicinity of the drill bit by high-pressure air, and seals the side exhaust hole 114 and the end exhaust hole 124, forming a local high air pressure in the vicinity of the drill bit, and under the action of high-pressure pulse air, the drill bit assembly 12 with magnetism is extruded out of the drill bit body 11.

[0080] Resin anchoring agent: a cement-like bonding material prepared by mixing high-strength anchoring agent special unsaturated polyester resin with marble powder, accelerant and auxiliary materials, and packaged as a two-component package cartridge with the cement and curing agent separated by a special polyester film. The resin cartridge anchoring agent can quickly generate bonding force after being pierced and stirred, bonding the end of the anchor rod to the surrounding rock.

[0081] Grouting material 8: after the anchor rod deformation reaches the design value, injected from the end of the hollow anchor rod, flows out of the grouting hole on the hollow rod body 2, and fills the entire anchor hole, and after hardening, plays a role in full-length bonding of the anchor rod and improves the corrosion resistance of the anchor rod.

[0082] Specific implementation process;

[0083] Step 1: connect the hollow rod body 2 to the anchor drill, and align the anchor rod with the design position of the anchor hole;

[0084] Step 2: start the anchor drill, and realize anchor drilling under the cutting of the self-drilling bit of the anchor rod; the exhaust holes of the hollow rod body 2 and the combined drill bit can be used as air inlet channels for slag removal and hole cleaning by high-pressure air;

[0085] Step 3: insert a high-density sponge ball into the end of the hollow rod body 2, and blow the high-density sponge ball to the vicinity of the drill bit by high-pressure air to seal the nearby exhaust holes and avoid excessive loss of local air pressure;

[0086] Step 4: since the drill bit body 11 and the drill bit assembly 12 are connected by insertion and magnetic attraction, a high-pressure air pulse is used to blow off the drill bit assembly 12;

[0087] Step 5: Insert the resin roll anchoring agent into the hollow rod body 2 from the end plug;

[0088] Step 6: Push the anchoring agent into the anchor hole by blowing high-pressure air and pulling back a certain distance;

[0089] Step 7: Decide the amount of blowing anchoring agent as needed;

[0090] Step 8: Start the anchor rod drill, rotate and advance, use the drill bit body 11 and rod to pierce, mix and stir the resin roll anchoring agent. After the anchoring agent coagulates and hardens, it forms an end anchoring effect, and the drill bit and nearby rod are firmly bonded to the anchor hole, while the rod in the non-anchoring segment can be freely extended;

[0091] Step 9: Install accessories such as the grout stopper 4, the backing plate 5, and the nut 6, tighten the nut 6 to tension the rod, and apply pre-stress to the rod, thereby pressing the surrounding rock through the backing plate 5 to achieve immediate reinforcement and support effect;

[0092] Step 10: The free section of the anchor rod is made of large elongation steel material, which can extend to a certain extent while maintaining the pre-stress of the rod, thereby adapting to the deformation of the surrounding rock without being pulled off. When the deformation reaches the design value, grouting is carried out through the hollow rod 2, and the grout fills the space between the anchor rod and the anchor hole, forming a full-length anchoring effect, thereby improving the stress state of the anchor rod and improving the corrosion resistance.

[0093] In summary, it can be known that the present application mainly proposes a drill bit assembly 1, which is a combined drill bit mainly composed of a drill bit body 11 and a drill bit assembly 12 connected by insertion and magnetic attraction. Without affecting the common rotation of cutting rock mass, the drill bit assembly 12 can be detached under certain conditions, thereby reserving a channel for the resin roll anchoring agent to enter the drill hole. The thorn-like protrusions on the inner wall of the drill bit body 11 can tear the resin roll anchoring agent packaging bag, and the outer blade 113 of the drill bit body 11 and the nearby anchor rod can fully stir the resin roll anchoring agent.

[0094] In addition, in the anchor rod structure disclosed in the present application, the hollow rod body 2 is made of special steel material after heat treatment, and the rod body has excellent mechanical properties, not only meeting the mechanical properties required as a drill rod, but also realizing a certain degree of extension of the rod body itself under harsh conditions such as soft rock large deformation, and has good deformation self-adaptive characteristics. At the same time, in the present application, the hollow rod body 2 adopts an elongation rate rod body, which can deform to a certain extent while maintaining the pre-stress, thereby absorbing the energy released by the deformation of the surrounding rock, and has a deformation self-adaptive effect, which can prevent the rod body from being pulled off.

[0095] The anchor rod first realizes end anchoring by using the resin roll anchoring agent, and can apply pre-stress. In the later period, full-length anchoring is realized by grouting, which improves the anchoring force and durability.

[0096] When the surrounding rock is loose and broken, the anchor rod hole is easy to collapse after the drill rod is taken out, and other types of anchor rods such as combined hollow anchor rods cannot be inserted, at this time only self-drilling anchor rods can be used; the self-drilling anchor rod drills and grouts at the same time, and the slurry hardens to generate strength in 18-24 hours, so the anchor rod cannot bear force within 1-2 days after installation, and prestress cannot be applied; the anchor rod uses a resin roll anchoring agent for end anchoring, the resin anchoring agent can be solidified and hardened within 1 minute, and prestress can be applied to the anchor rod, thereby solving the problem that the easy-to-collapse hole surrounding rock cannot be supported by prestressed anchor rods.

[0097] In addition, more importantly, the anchor rod structure disclosed by the application does not require additional construction equipment during installation, and existing anchor rod drilling machines and anchor rod trolleys can complete anchor rod construction.

[0098] The anchor rod installation only needs to drill once, without pulling out, the construction efficiency is greatly improved, and the amount of drill rod used is saved, so the anchor rod structure and the use method disclosed by the application have economic and construction advantages; it is very suitable for use in practice.

[0099] It is mentioned in the background art that the resin anchoring agent roll is prior art, which will not be repeated here (similar to a ham sausage, which includes AB components that do not contact each other at ordinary times, and can be rapidly solidified after forced stirring to mix AB).

[0100] Obviously, the specific implementation of the application is not limited by the above method, as long as various non-essential improvements are made by adopting the method concept and technical scheme of the application, they are within the protection scope of the application.

Claims

1. A drill bit assembly for anchor bolts, characterized in that, It includes a drill bit body and a drill bit assembly; the drill bit body is provided with an assembly through hole, and the drill bit assembly is installed inside the drill bit body through the assembly through hole; the drill bit body is provided with an outer cutting edge. The drill bit assembly is magnetized and adsorbed inside the drill bit body. The positioning mechanism includes a second positioning part, which includes a protruding spike disposed on the inner wall of the assembly through hole and a spike-shaped groove disposed on the outer surface of the drill bit assembly body; the protruding spike and the spike-shaped groove cooperate with each other; the protruding spike can be used to break the outer packaging of the anchoring agent; A positioning mechanism is provided between the drill bit assembly and the drill bit body. The positioning mechanism includes a first positioning part; the first positioning part includes a positioning protrusion provided on the drill bit assembly; a positioning groove is provided on the inner wall of the assembly through hole; the positioning protrusion is engaged in the positioning groove.

2. The drill bit assembly for anchor bolts according to claim 1, characterized in that, The drill bit body is provided with a side vent hole, and the drill bit assembly is provided with an end vent hole.

3. An anchor bolt structure employing the drill bit assembly for anchor bolts as described in any one of claims 1-2, characterized in that, It includes a hollow rod body, and a drill bit assembly is provided at the end of the hollow rod body; the hollow rod body and the drill bit body in the drill bit assembly are connected by threads.

4. The anchor bolt structure according to claim 3, characterized in that, The hollow rod body is provided with a pad, and the pad is provided with a grout stop plug on the side near the drill bit assembly. The grout stop plug is sleeved on the hollow rod body.

5. The anchor bolt structure according to claim 3, characterized in that, The hollow rod body contains a sealing ball.

6. A method of using the anchor bolt structure according to any one of claims 3-5, characterized in that, The method of use includes the following steps: Step 1: Connect the hollow rod to the anchor drilling machine, and align the anchor rod with the designed position of the anchor hole; Step 2: Start the anchor drilling machine and use the anchor assembly to drill the anchor bolts until the drilled anchor bolt hole meets the design requirements. Step 3: After step 2 is completed, blow high-pressure air from the end of the hollow rod away from the drill bit assembly; so that the high-pressure air blows the drill bit assembly off the drill bit body. Step 4: After completing Step 3, insert the resin roll anchoring agent into the hollow rod body from the end away from the drill bit assembly; blow the corresponding amount of anchoring agent according to the design requirements. Step 5: After completing Step 4, start the anchor drilling machine, rotate and advance, use the drill bit body and rod to puncture, mix and stir the resin roll anchoring agent; so that the anchoring agent solidifies and hardens to form an end anchoring effect, so that the drill bit and the nearby rod body are firmly bonded to the anchor hole. Step 6: After completing Step 5, install the grout stop plug, gasket, and nut, tighten the nut to tension the rod, apply prestress to the rod, and thus achieve immediate reinforcement and support by squeezing the surrounding rock through the gasket.

7. The method of using an anchor bolt structure according to claim 6, characterized in that, After step 6 is completed, grout is injected into the anchor bolt hole and the hollow rod body through the hollow rod body, and the grout fills the entire space between the anchor bolt and the anchor bolt hole.

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