Hollow anchor rod with external resin and mounting method thereof

Abstract

The invention discloses an external resin hollow anchor rod and a mounting method thereof, the anchor rod comprises a hollow rod body, and a stop-grouting plug, a base plate, a spherical washer and a nut which are sequentially arranged at the tail end of the hollow rod body in a sleeving manner, and an anchoring agent plastic pipe filled with a resin anchoring agent is arranged at the front end of the hollow rod body. Compared with the prior art, the anchor rod has the advantages that an anchoring agent is arranged outside the rod body, the hollow rod body is directly assembled with the anchoring agent plastic pipe through threads, the product structure is simple, and the utilization rate of the anchoring agent is effectively increased; the inner diameter of the anchoring agent plastic pipe is slightly smaller than the outer diameter of the anchoring agent, interference fit is formed during assembly, the anchoring agent is prevented from falling off in the anchor rod installation process, and mechanical installation can be adapted; the pipe body of the plastic pipe and the tail internal thread are plugged through a solid material, so that the anchoring agent is prevented from flowing back into the rod body; the stirring effect of the anchoring agent can be effectively improved, and the anchoring success rate is increased.

Description

Technical Field

[0001] The invention relates to a resin external hollow anchor rod and an installation method thereof, which are suitable for the construction technical field with hard rock or medium-hard rock layers such as traffic tunnels, underground spaces and oil reservoirs. Background Art

[0002] In projects such as traffic tunnels, underground spaces, and oil reservoirs, anchor rods are widely used as an important support product for rock reinforcement and stabilization. Existing anchor rod products are mainly divided into two categories: mechanical anchor rods and resin anchor rods. Mechanical anchor rods are anchored in time by expanding the mechanical anchor in the anchor hole, but due to the large size of the mechanical anchor, the integrity of the anchor hole is required to be high. Resin anchor rods are anchored by bonding the resin anchoring agent with the rock layer, which has a good anchoring effect, but in actual application, the mixing and distribution of the resin anchoring agent are uneven, resulting in unstable anchoring effect. In the prior art, the installation of resin anchor rods usually requires manual operation, and the hole needs to be cleaned before the anchoring agent is installed. The installation efficiency is low, and it is difficult to ensure the uniform distribution of the anchoring agent. Although the anchor rod with the anchoring agent built into the rod body does not need to clean the hole or install the anchoring agent separately, there is a hidden danger that the anchoring agent cannot be completely pushed out due to the slag or anchoring agent packaging blocking the slurry outlet during the push-out process of the anchoring agent. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes a resin external hollow anchor rod and an installation method thereof.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a resin external hollow anchor rod, including a hollow rod body and a slurry stopper, a pad, a spherical washer and a nut sequentially sleeved on the tail end of the hollow rod body, and an anchor plastic tube filled with resin anchor is arranged at the front end of the hollow rod body.

[0005] The present invention also provides a method for installing a resin external hollow anchor rod, comprising the following steps:

[0006] Step 1: Put the assembled anchor rods into the anchor rod warehouse of the anchor rod trolley;

[0007] Step 2: Drilling;

[0008] Step 3: Anchor installation: Use the anchor trolley manipulator to grab the anchor, align the plastic tube with the resin anchor at the front end of the anchor with the anchor hole, dock the inner sleeve of the trolley with the tail of the anchor, and drive the trolley forward until the resin anchor is pushed to the bottom of the anchor hole;

[0009] Step 4: Extruding and stirring the anchoring agent: driving the anchor trolley to rotate the inner sleeve counterclockwise and the outer sleeve to follow, driving the hollow rod body forward through the inner sleeve. During the advancement process, the anchoring agent plastic tube is crushed and the resin anchoring agent is squeezed out; after the anchor rod is pushed to the bottom of the hole, the inner sleeve of the anchor trolley is kept counterclockwise and the outer sleeve is kept to follow, stirring the resin anchoring agent so that the anchoring agent is filled between the anchor rod and the anchor hole;

[0010] Step 5: Pre-tightening: After the anchoring agent solidifies, drive the inner sleeve back to tension the anchor rod. After reaching the designed prestress value, drive the outer sleeve to turn left to tighten the nut against the spherical washer to complete the application of anchor rod prestress.

[0011] Step 6: Grouting: Pump the premixed cement mortar into the hollow rod body through the inner sleeve, and wait for the cement mortar to flow out from the slurry outlet hole reserved at the front end of the rod body to realize the grouting of the anchor rod.

[0012] Compared with the prior art, the present invention has the following positive effects:

[0013] 1. In the anchor rod structure of the present invention, the hollow rod body is directly assembled with the anchoring agent plastic tube through threads, and the product structure is simple. Compared with the built-in resin anchor rod that cannot completely push out the anchoring agent, the present invention places the anchoring agent outside the rod body, which effectively improves the utilization rate of the anchoring agent.

[0014] 2. The present invention squeezes the anchoring agent by crushing the plastic tube, and the tail of the plastic tube is provided with an internal thread to match the rod body. The plastic tube body and the tail internal thread are blocked by a solid material to prevent the anchoring agent from flowing back into the rod body.

[0015] 3. The inner diameter of the anchor plastic tube in the present invention is slightly smaller than the outer diameter of the anchor, forming an interference fit during assembly to prevent the anchor from falling during the installation of the anchor rod, and can adapt to mechanized installation.

[0016] 4. The plastic pipe in the present invention is a brittle and hard material, which can effectively protect the anchor in the pipe during the installation of the anchor rod. However, the plastic pipe will break after reaching a certain pressure, and the crushed plastic pipe fragments help to destroy the anchor packaging. The outer surface of the plastic pipe thread section is designed with a sharp protruding structure, which increases the contact area between the plastic pipe and the anchor. The uneven outer surface increases the flow resistance of the anchor. During the rotation and advancement of the anchor rod, these protruding structures will stir the anchor like a stirrer. The stirring effect of the anchor is effectively improved, and the success rate of anchoring is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0018] Figure 1 It is a schematic diagram of the overall composition of the present invention;

[0019] Figure 2 It is a schematic diagram of the installation process of the present invention;

[0020] Figure 3 It is a schematic diagram of the process of squeezing the plastic pipe and stirring the anchoring agent according to the present invention;

[0021] Figure 4 It is a schematic diagram of the grouting process of the present invention;

[0022] The reference numerals in the figure include: resin anchor 1, anchor plastic pipe 2, slurry outlet hole 3, slurry stop plug 4, backing plate 5, spherical washer 6, nut 7, hollow rod body 8, outer sleeve 9, inner sleeve 10. DETAILED DESCRIPTION

[0023] A resin external hollow anchor rod, such as Figure 1 As shown, it includes: a resin anchor 1, an anchor plastic pipe 2, a slurry outlet hole 3, a slurry stopper 4, a backing plate 5, a spherical washer 6, a nut 7 and a hollow rod body 8, wherein:

[0024] The anchoring agent plastic tube 2 is divided into a hollow section and a threaded section. The hollow section is a tubular structure, which is used to accommodate the resin anchoring agent 1. It not only ensures the strength of the plastic tube itself and can carry the anchoring agent, but also effectively protects the anchoring agent, avoiding the anchoring agent being damaged due to the friction between the inner wall of the anchor hole and the anchoring agent during the installation process. The threaded section is an internal thread, which is directly connected to the hollow rod body 8 by a thread, and the assembly is convenient and quick. A sharp protrusion structure is provided on the outside of the threaded section, which can fully stir the anchoring agent. The hollow section and the threaded section are blocked by a solid material to prevent the anchoring agent from flowing back into the hollow rod body. The inner diameter of the anchoring agent plastic tube 2 is slightly smaller than the outer diameter of the resin anchoring agent 1, and an interference fit is formed during assembly to prevent the anchoring agent from falling during the installation of the anchor rod, and can adapt to mechanized installation.

[0025] The installation of the resin external hollow anchor rod of the present invention comprises the following steps:

[0026] Step 1: Anchor rod assembly. Figure 1 The structure is used to assemble the anchor rods, and the assembled anchor rods are placed in the anchor rod library of the anchor rod trolley; the specific assembly method is:

[0027] Put the stopper 4, the backing plate 5, the spherical washer 6 and the nut 7 on the hollow rod body from the tail end of the hollow rod body 8 in sequence, assemble the threaded section at the tail end of the anchoring agent plastic tube 2 with the front end of the hollow rod body through threads, and then install the resin anchoring agent 1 into the hollow section at the front end of the anchoring agent plastic tube 2;

[0028] Step 2: Drilling;

[0029] Step 3: Anchor installation. Use the anchor trolley manipulator to grab the anchor, align the plastic tube with anchoring agent at the front end of the anchor to the anchor hole, dock the inner sleeve 10 of the trolley with the tail of the hollow rod body 8, and drive the trolley forward until the resin anchor 1 is pushed to the bottom of the anchor hole. Figure 2 As shown;

[0030] Step 4: Extrude and stir the anchoring agent. Drive the anchor trolley to rotate counterclockwise to rotate the inner sleeve 10 and the outer sleeve 9 to follow. The inner sleeve drives the hollow rod body (left-handed thread) to rotate counterclockwise and move forward. During the advancement, the anchoring agent plastic tube 2 is crushed, and the resin anchoring agent 1 is squeezed out after being cut by the crushed plastic tube fragments. After the anchor is pushed to the bottom of the hole, keep the inner sleeve of the anchor trolley counterclockwise and the outer sleeve to follow), stir the anchoring agent, so that the anchoring agent fills the space between the hollow rod body and the anchor hole, such as Figure 3 As shown;

[0031] Step 5: Pre-tightening. After the anchoring agent solidifies, drive the inner sleeve 10 to retract the anchor rod. After the designed prestress value is reached, drive the outer sleeve 9 to tighten the nut 7 to the spherical washer 6 to complete the application of anchor rod prestress;

[0032] Step 6: Grouting. The premixed cement mortar is pumped into the hollow rod body 8 through the inner sleeve 10 and flows out from the grouting hole 3 at the front end of the rod body to achieve grouting of the anchor rod. Figure 4 shown.

[0033] Working principle of the present invention:

[0034] 1. The anchor rod structure of the present invention is simple (such as Figure 1 As shown in the figure, the plastic pipe is provided with an internal thread, which is directly connected to the hollow rod body, thus simplifying the structure and making the anchor and the hollow rod body a whole. It can be equipped with a large machine for mechanized installation, thus improving construction efficiency, reducing manual operations, and reducing construction difficulty and cost.

[0035] 2. The present invention designs a new plastic pipe structure (such as Figure 2 As shown), the size design conforms to the "three-diameter matching" theory. The outer diameter of the anchor plastic tube 2 matches the anchor hole design, and the front end is a hollow tubular structure for loading the anchor (the inner diameter of the anchor plastic tube 2 is slightly smaller than the outer diameter of the resin anchor 1, and the anchor is fixed in the plastic tube by interference fit). The tail is provided with an internal thread to connect the hollow rod body, and the plastic tube body and the internal thread are sealed with solid material to prevent the anchor from flowing back.

[0036] 3. The plastic pipe material in the present invention is a brittle and hard material. The processed plastic pipe can protect the anchoring agent from being scratched by the gravel in the anchor hole when the anchor rod is placed in the anchor hole. The outer surface of the threaded section is designed with a sharp protruding structure, which can fully stir the anchoring agent, ensure the anchoring effect, and improve the success rate of the anchor rod installation.

[0037] 4. The resin external hollow anchor rod and the supporting anchor rod trolley of the present invention can realize the mechanized installation of the anchor rod, reduce the construction risk, and effectively promote the construction progress.

Claims

1. A resin external hollow anchor, characterized in that: The utility model comprises a hollow rod body and a slurry stopper, a pad, a spherical washer and a nut which are sequentially sleeved on the tail end of the hollow rod body, and an anchoring agent plastic pipe filled with a resin anchoring agent is arranged at the front end of the hollow rod body.

2. The resin external hollow anchor according to claim 1, characterized in that: The anchor plastic pipe is divided into a hollow section and an internal thread section.

3. The resin external hollow anchor according to claim 2, characterized in that: The hollow section and the internal thread section are sealed by solid material.

4. The resin external hollow anchor according to claim 2, characterized in that: A sharp protrusion structure is arranged on the outer surface of the internal thread section.

5. The resin external hollow anchor according to claim 2, characterized in that: The front end of the hollow rod body is assembled with the internal thread section of the anchoring agent plastic pipe through threads.

6. The resin external hollow anchor according to claim 1, characterized in that: The inner diameter of the anchor plastic tube is slightly smaller than the outer diameter of the resin anchor, and the resin anchor is fixed by interference fit.

7. The resin external hollow anchor according to claim 1, characterized in that: The anchor plastic tube is made of brittle and hard material.

8. A method for installing a resin external hollow anchor, characterized in that: The steps include: Step 1: Put the assembled anchor rods into the anchor rod warehouse of the anchor rod trolley; Step 2: Drilling; Step 3: Anchor installation: Use the anchor trolley manipulator to grab the anchor, align the plastic tube with the resin anchor at the front end of the anchor with the anchor hole, dock the inner sleeve of the trolley with the tail of the anchor, and drive the trolley forward until the resin anchor is pushed to the bottom of the anchor hole; Step 4: Extruding and stirring the anchoring agent: driving the anchor trolley to rotate the inner sleeve counterclockwise and the outer sleeve to follow, driving the hollow rod body forward through the inner sleeve. During the advancement process, the anchoring agent plastic tube is crushed and the resin anchoring agent is squeezed out; after the anchor rod is pushed to the bottom of the hole, the inner sleeve of the anchor trolley is kept counterclockwise and the outer sleeve is kept to follow, stirring the resin anchoring agent so that the anchoring agent is filled between the anchor rod and the anchor hole; Step 5: Pre-tightening: After the anchoring agent solidifies, drive the inner sleeve back to tension the anchor rod. After reaching the designed prestress value, drive the outer sleeve to turn left to tighten the nut against the spherical washer to complete the application of anchor rod prestress. Step 6: Grouting: Pump the premixed cement mortar into the hollow rod body through the inner sleeve, and wait for the cement mortar to flow out from the slurry outlet hole reserved at the front end of the rod body to realize the grouting of the anchor rod.

9. The method for installing a resin external hollow anchor according to claim 8, characterized in that: In step one, the method of assembling the anchor rod is: put the slurry stopper, pad, spherical washer, and nut on the hollow rod body from the tail end of the hollow rod body in sequence, then assemble the internal thread section of the anchor plastic tube with the front end of the hollow rod body through threads, and then load the resin anchor into the hollow section at the front end of the anchor plastic tube.

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