CN115637696A - Pressure-bearing tension composite anchor rod and construction method - Google Patents

Abstract

The invention discloses a novel anchor rod, which is mainly composed of an anchor body, a sleeve, a bearing plate, a nut, an anchor pad and a lock. The space is connected by welding; the sleeve is sleeved outside the anchor body, and two U-shaped grooves are provided at the front and rear ends, and a U-shaped pin is provided on one side of the bearing plate, which is adapted to the U-shaped groove of the sleeve. The sleeve is set at the end of the casing; the nut is provided with an internal thread, which is adapted to the external thread of the anchoring body. Its beneficial effects are: by setting a casing with a U-shaped groove at both ends on the outer side of the anchor rod, and using the U-shaped groove to connect the rod body and the steel pipe by welding, the new anchor rod is quite stable in use. In order to insert two anchor rods into one hole at the same time, the anchor rod is divided into a pressure anchor section and a tension anchor section, which improves the ability to bear pressure and tension, thereby improving the anchoring effect.

Description

A kind of compression and tension composite anchor rod and its construction method

technical field

The invention relates to the field of geotechnical engineering support structures, in particular to a pressure-bearing and tension composite bolt and a construction method.

Background technique

Anchor is an excellent structure that works with rock and soil reinforcement. Anchor support is a reinforcement and support method used in surface engineering such as slopes, deep foundation pits of rock and soil, and underground chambers such as tunnels and stopes. The poles are made of metal parts, wood parts and polymer parts, and are driven into the pre-bricked holes of the surface rock or the rock mass around the chamber. Using the special structure of the head and rods and the plate support at the tail, or relying on the bonding effect to combine the surrounding rock and the stable rock mass to find out the suspension effect, the combined beam effect and reinforcement effect, to achieve purpose of support. It has the advantages of low cost, good support effect, simple operation, flexible use, and less construction clearance. However, as the technology development of various projects at this stage is getting faster and faster, the requirements for bolt capacity are also getting higher and higher. Especially reflected in the requirements for the bearing capacity of the anchor.

Traditional prestressed anchors are divided into tension-type anchors and pressure-type anchors. The load on tension-type anchors is directly transmitted to the rock and soil mass through the bond between the steel strand and the anchor. Tension-type anchors tend to exceed the red line of land use during use, and their steel strands will become obstacles to the subsequent development of underground space, which is greatly restricted in practical application, and then the pressure-type anchor is developed.

Tension-type anchors and pressure-type anchors can only bear a single form of force, and the supporting force is small and easily damaged. The pressure-tension composite bolt decomposes the single anchor section of the traditional anchor into a pressure anchor section and a tension anchor section, which greatly reduces the stress concentration phenomenon between the anchor section and the rock-soil interface, and makes the anchor section and the rock-soil The bonding strength of the body is fully exerted. When the length of the anchorage section is the same, the pull-out bearing capacity of the tension-compression composite anchor is significantly improved compared with the traditional tension anchor and the traditional pressure anchor.

Contents of the invention

The purpose of the present invention is to provide an improved back-pull type tension-compression compound anchor rod that can fully exert the bearing capacity of the pressure-bearing anchorage section in the hard soil layer and have a higher pull-out bearing capacity of the anchor rod. Another purpose of the present invention It is to propose the construction method of the anchor rod.

The present invention solves the above-mentioned technical problems by adopting the following technical solutions:

The invention relates to a pressure and tension composite anchor rod, which includes an anchor body, a casing, a bearing plate, a nut, an anchor pad and a lock. The entire length of the anchor body is provided with continuous external threads, and the anchor head section and The tubes are connected by welding; the sleeve is sleeved on the outside of the anchor, and two U-shaped grooves are provided at the front and rear ends, and a U-shaped pin is provided on one side of the bearing plate, which is suitable for the U-shaped groove of the sleeve. Matching, sleeved at the end of the casing; the nut is provided with an internal thread, which is compatible with the external thread of the anchor.

The length of the casing is shorter than that of the anchoring body, thereby forming a pressure-bearing anchoring section and a tensioning anchoring section, the lengths of which can be determined according to actual engineering conditions.

The inner diameters of the casing, the bearing plate and the nut are slightly larger than the outer diameter of the anchor, and are compatible with the anchor, and the nut connects and fixes the anchor, the sleeve, and the bearing plate.

The U-shaped groove provided at the joint between the sleeve and the anchor is symmetrical with respect to the anchor.

Both the casing and the bearing plate are made of high-strength steel, the casing is an anti-corrosion steel pipe, and the surface is rolled with a mesh pattern to increase the moment and friction, and the carrier is a circular steel plate.

Based on the anchor rod described above, the present invention also provides a compression-tension composite anchor rod and a construction method, including the following steps:

Step 1: Insert the anchor into the casing, and the U-shaped groove at the front end of the casing is docked with the U-shaped pin of the lock;

Step 2: Put the bearing plate into the anchor body and stick it to the sleeve, the U-shaped pin is connected to the U-shaped groove of the sleeve, and then the nut is screwed to fix the bearing plate on one end of the sleeve;

Step 3: Send the resin anchoring agent into the anchor hole, push the anchor rod toward the bottom of the hole at a relatively fast speed, push the anchorage section under tension into the soft soil layer, and push the anchorage section under pressure into the hard soil layer;

Step 4: Inject cement slurry into the bolt hole through a grouting pipe, and then inject clean water into the bolt hole. The clean water will dilute the cement slurry outside the free section and the cement slurry in the pierced hole to the set requirements. The bearing plate isolates the clear water from flowing to the cement slurry outside the anchorage section;

Step 5: After applying a certain prestress to the anchor rod, immediately lock the anchor body on the lock, and seal the anchor head with concrete.

The beneficial effects of the present invention are:

As a preferred mode of the present invention, the pressure bearing plate is 1-3m away from the soft soil layer.

By setting a steel pipe with a U-shaped groove at each end on the outside of the anchor rod, and using the U-shaped groove to connect the rod body and the steel pipe by welding, the new anchor rod is equivalent to being in a hole at the same time when in use. Insert two anchor rods, the rod body is a long anchor rod, and the anchoring method provided is an end anchor, and the steel pipe is a short anchor rod, which provides full-range anchoring, thereby improving the anchoring effect.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is the sectional structure schematic diagram of anchor rod among the present invention;

Fig. 2 is the top view of anchor rod among the present invention;

Fig. 3 is a structural schematic diagram of a bearing plate and a nut in the present invention.

In the figure, 1. Anchoring body, 2. Sleeve, 3. Bearing plate, 4. Nut, 5. Anchoring pad, 6. Lock.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the description is not intended to limit the invention to the exemplary embodiment. On the contrary, the invention is to cover not only the exemplary embodiment, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims Inside.

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Figure 1 and Figure 2, a pressure-tension composite anchor rod includes an anchor (1), a casing (2), a bearing plate (3), a nut (4), and an anchor pad (5) and a lock (6), characterized in that: the entire length of the anchor (1) is provided with continuous external threads, and the anchor head section and the sleeve (2) are connected by welding; the sleeve (2) ) is sleeved on the outside of the anchor (1), and two U-shaped grooves are provided at the front and rear ends, and a U-shaped pin is provided on one side of the bearing plate (3), which is adapted to the U-shaped groove of the sleeve (2). At the end of the casing (2); the nut (4) is provided with an internal thread, which is compatible with the external thread of the anchor (1).

As a further embodiment, the length of the sleeve (2) is shorter than that of the anchor (1), thereby forming a pressure-bearing anchor section and a tension anchor section, the lengths of which can be determined according to actual engineering conditions.

As shown in Figure 3, the inner diameter of the sleeve (2), bearing plate (3) and nut (4) is slightly larger than the outer diameter of the anchor (1), and is compatible with the anchor (1), and the nut (4) Connect and fix the anchor (1), casing (2) and bearing plate (3).

As a further embodiment, the U-shaped groove provided at the connection between the sleeve (2) and the anchor (1) is symmetrical with respect to the anchor (1).

As a further embodiment, the casing (2) and the bearing plate (3) are both made of high-strength steel, the casing (2) is an anti-corrosion steel pipe, and the surface is rolled with a mesh pattern to increase the torque and Friction, the carrier (3) is a circular steel plate.

Based on the anchor rod described above, the present invention also provides a compression-tension composite anchor rod and a construction method, including the following steps:

Step 1: Insert the anchor into the sleeve (2), and the U-shaped groove at the front end of the sleeve (2) is docked with the U-shaped pin of the lock (5);

Step 2: Put the bearing plate (3) into the anchor body (1) and stick it to the sleeve (2), the U-shaped pin is connected to the U-shaped groove of the sleeve (2), and then screw the nut (4) to secure the bearing plate (3) fixed at one end of the casing (2);

Step 3: Send the resin anchoring agent into the anchor hole, push the anchor rod toward the bottom of the hole at a relatively fast speed, push the anchorage section under tension into the soft soil layer, and push the anchorage section under pressure into the hard soil layer;

Step 4: Inject cement slurry into the bolt hole through a grouting pipe, and then inject clean water into the bolt hole. The clean water will dilute the cement slurry outside the free section and the cement slurry in the pierced hole to the set requirements. The bearing plate (3) isolates the water from flowing to the cement slurry outside the anchorage section;

Step 5: After applying a certain amount of prestress to the anchor rod, lock and fix the anchor (1) on the lock (5) immediately, and seal the anchor head (6) with concrete.

In summary, although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or perform equivalent replacements for some technical features. Modifications, equivalent replacements, improvements, etc. made in accordance with the spirit and principles of the invention shall be included in the protection scope of the present invention.

Claims (6)

1. A pressure and tension composite anchor rod, including an anchor (1), a sleeve (2), a bearing plate (3), a nut (4), an anchor pad (5) and a lock (6). It is characterized in that: the entire length of the anchor (1) is provided with continuous external threads, and the anchor head section and the sleeve (2) are connected by welding; the sleeve (2) is sleeved on the anchor ( 1) Outside, there are two U-shaped grooves at the front and rear ends, and a U-shaped pin is arranged on one side of the bearing plate (3), which is adapted to the U-shaped groove of the sleeve (2), and is sleeved at the end of the sleeve (2) ; The nut (4) is provided with an internal thread, which is compatible with the external thread of the anchor (1). 2. A pressure-tension composite anchor according to claim 1, characterized in that: the length of the sleeve (2) is less than the length of the anchor (1), thereby forming a pressure-bearing anchor section and a tension The length of the anchorage section can be determined according to the actual engineering situation. 3. A pressure-tension composite anchor according to claim 1, characterized in that: the inner diameters of the casing (2), bearing plate (3) and nut (4) are slightly larger than the outer diameter of the anchor (1) The diameter is suitable for the anchor (1), and the nut (4) connects and fixes the anchor (1), the sleeve (2) and the bearing plate (3). 4. A pressure-tension composite anchor according to claim 1, characterized in that: the U-shaped groove provided at the connection between the sleeve (2) and the anchor (1) is symmetrical with respect to the anchor (1) . 5. A pressure and tension composite bolt according to claim 1, characterized in that: the casing (2) and the bearing plate (3) are both made of high-strength steel, and the casing (2 ) is an anti-corrosion steel pipe with a rolled mesh pattern on the surface to increase the torque and friction, and the carrier (3) is a circular steel plate. 6. A pressure and tension composite anchor rod and construction method according to claims 1-5, characterized in that it comprises the following steps: Step 1: Insert the anchor into the sleeve (2), and the U-shaped groove at the front end of the sleeve (2) is docked with the U-shaped pin of the lock (5); Step 2: Put the bearing plate (3) into the anchor body (1) and stick it to the sleeve (2), the U-shaped pin is connected to the U-shaped groove of the sleeve (2), and then screw the nut (4) to secure the bearing plate (3) fixed at one end of the casing (2); Step 3: Send the resin anchoring agent into the anchor hole, push the anchor rod toward the bottom of the hole at a relatively fast speed, push the anchorage section under tension into the soft soil layer, and push the anchorage section under pressure into the hard soil layer; Step 4: Inject cement slurry into the bolt hole through a grouting pipe, and then inject clean water into the bolt hole. The clean water will dilute the cement slurry outside the free section and the cement slurry in the pierced hole to the set requirements. The bearing plate (3) isolates the water from flowing to the cement slurry outside the anchorage section; Step 5: After applying a certain amount of prestress to the anchor rod, lock and fix the anchor (1) on the lock (5) immediately, and seal the anchor head (6) with concrete.

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