CN205117379U - Let pressure stock from advancing formula large deformation - Google Patents

Abstract

The utility model provides a let pressure stock from advancing formula large deformation, by outer nut, bearing plate, the friction sleeve section of thick bamboo that excels in, the stock body of rod, anti hinder the sleeve pipe and excel in the drill bit constitutes, the friction sleeve section of thick bamboo outer wall that excels in is equipped with the screw thread, the inner wall is equipped with the wedge clutch blocks that the interval equals, the size is unanimous, the inside round platform form friction joint that is equipped with of sleeve, the stock body of rod is both ends threaded smooth rod personally experiences sth. Part of the body, can realize round platform form friction joint and the anti sheathed tube that hinders and wholly be connected, anti hinder the sleeve pipe surface and being equipped with the external screw thread, the internal surface contains the internal thread, and the external diameter is the same with the external diameter of the friction sleeve section of thick bamboo that excels in, just all is less than the maximum diameter of the drill bit that excels in. The utility model discloses can realize the dual pressure effect that lets well, while simple structure, construction convenience, but the wide application is in large deformation weak surrounding rock struts the engineering.

Description

A Self-advancing Large Deformation Yield Anchor Rod

technical field

The utility model relates to a yield anchor commonly used in geotechnical engineering, in particular to a self-propelled large-deformation yield anchor in the technical field of geotechnical engineering anchoring.

Background technique

For underground projects such as mine engineering and tunnel engineering, when construction is carried out in weak surrounding rock, the deformation energy generated by excavating the surrounding rock will be released to the free space. With the increase of the construction depth, the surrounding rock of the deep roadway often shows the characteristics of large deformation, and the supporting problem requires the support to have a high initial support force, working resistance and scalability.

At present, anchor rod or anchor cable is the most widely used form in underground engineering surrounding rock support, which can effectively control the deformation of surrounding rock itself. However, the following problems of traditional bolts have certain limitations in engineering support:

(1) The elongation rate of traditional bolts is low, which cannot meet the requirements of large deformation of surrounding rock. When the surrounding rock undergoes large deformation, a large deformation energy will be generated. When the deformation of the surrounding rock exceeds the range that the anchor can bear, the anchor or anchor cable will fail;

(2) In the process of traditional anchor bolt construction, the method of forming the anchor hole first and then inserting the anchor bolt for grouting is usually adopted. However, in the reinforcement and support of weak surrounding rock, this method is prone to hole collapse, resulting in a low porosity rate ;

(3) In the process of inserting the anchor rod in traditional construction, it is difficult to maintain a straight line due to complex forces, making it difficult for the anchor rod to be inserted into the anchor hole. At this time, self-advancing anchor rods are mostly used, that is, the anchor rod has a drill bit, which can be used as a drill rod to drill by itself, and the anchor rod body as a drill rod does not need to be pulled out.

From the above, it can be seen that the traditional anchor and its construction process have problems such as low elongation, poor hole forming effect, and difficult drilling. Therefore, it is urgent to develop a new anchor with high strength and high elongation.

Contents of the invention

In order to overcome the low elongation rate of traditional bolts, which cannot meet the supporting needs of roadway surrounding rock, especially when the weak surrounding rock undergoes large deformation, and effectively prevent the bolt body from being pulled off, the utility model proposes a self-propelled large The deformation gives way to the anchor rod, and some problems in the traditional anchor rod can be solved well through this structural device.

The utility model is realized through the following technical solutions.

A self-propelled large-deformation yielding anchor rod is composed of an outer nut, a pressure bearing plate, a high-strength friction sleeve, an anchor rod body, a resistance sleeve and a high-strength drill bit, wherein the outer wall of the high-strength friction sleeve is provided with threads, The inner wall is provided with wedge-shaped friction blocks with equal spacing and the same size, and a frustum-shaped friction joint is provided inside the sleeve; the anchor rod body is a smooth rod with threads at both ends, which can realize the integration of the frustum-shaped friction joint and the resistance casing Connection; the outer surface of the resistance sleeve is provided with external threads, and the inner surface contains internal threads. The outer diameter of the resistance sleeve is the same as that of the high-strength friction sleeve, and both are smaller than the maximum diameter of the high-strength drill bit.

As an improvement, the high-strength friction sleeve is a hollow sleeve with an open end and a central hole reserved at the bottom, and the diameter of the central hole is equal to the outer diameter of the anchor rod body.

As an improvement, the high-strength friction sleeve is a friction sleeve provided with an anti-corrosion and anti-rust protection structure, and the wedge-shaped friction block on its inner wall is a continuous closed ring.

As an improvement, the diameter of the lower bottom of the frustum-shaped friction joint is the same as the inner diameter of the high-strength friction sleeve, and the diameter of the upper bottom is larger than the diameter of the anchor rod body and smaller than the inner diameter of the section formed by the tip of the wedge-shaped friction block on the inner wall of the high-strength friction sleeve; the frustum-shaped friction joint An internal thread with the same diameter as the anchor rod body is left on the upper bottom surface; in addition, the outer wall of the friction joint is provided with wedge-shaped protrusions, and the angle of the protrusions is the same as that of the wedge-shaped friction blocks on the inner wall of the high-strength friction sleeve, and the spacing is equal.

As an improvement, the surface of the resistance sleeve is provided with an external thread, the outer diameter of which gradually changes from the largest point to the same outer diameter as the anchor rod.

As an improvement, one end of the bolt body is covered with an annular elastic block, and the outer diameter of the annular elastic block is smaller than the inner diameter of the section formed by the tip of the wedge-shaped friction block on the inner wall of the high-strength friction sleeve.

As an improvement, a rubber I-shaped ring is placed around the round hole at the bottom of the high-strength friction sleeve to ensure the closed state of the sleeve.

The beneficial effects of the utility model are:

1) When supporting the surrounding rock of the roadway, especially the weak surrounding rock with large deformation, the anchor rod of the utility model can automatically extend with the occurrence of large deformation, and exert the pressure-relieving effect of the high-strength friction sleeve to make the deformation in the surrounding rock can be effectively released. When the deformation continues to increase, the cohesive force on the smooth anchor body disappears, increasing the effective length of the deformation of the anchor body, and the deformation pressure is jointly borne by the high-strength friction sleeve and the resistance sleeve, thus realizing the dual function of the utility model. The yielding effect ensures the stability of the roadway surrounding rock;

2) The end of the anchor rod of the utility model is connected with a high-strength drill bit, which can be drilled by itself, avoiding the phenomenon of hole collapse caused by drilling first and then inserting the anchor rod in the support process of weak surrounding rock. In addition, the bolt body used as the drill rod does not need to be pulled out after drilling, which improves the construction efficiency and can be widely used in large-deformation weak surrounding rock support projects.

Description of drawings

Fig. 1 is a structural schematic diagram of a self-propelled large-deformation yielding anchor rod of the present invention.

Legend: 1-blocking nut; 2-outer nut; 3-elastic washer; 4-pressure bearing plate; 5-high-strength friction sleeve; 6-conical friction joint; Tube; 9-high-strength drill bit; 10-annular elastic block; 11-wedge friction block; 12-rubber I-shaped ring; 13-external thread.

detailed description

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a self-propelled large deformation pressure anchor rod described in the utility model consists of an outer nut 2, a pressure bearing plate 4, a high-strength friction sleeve 5, an anchor rod body 7, a resistance sleeve 8 and High-strength drill consists of 9 components. The high-strength friction sleeve 5 is a high-strength alloy sleeve, which is placed at the tail of the anchor rod. The pressure bearing plate 4 and the outer nut 2 are sequentially set on the high-strength friction sleeve 5. A central circular hole is reserved in the middle part of the pressure bearing plate 4. An elastic washer 3 is added between the pressure bearing plate 4 and the outer nut 2 so that it passes through the high-strength friction sleeve 5 . The diameter of the round hole at the end of the high-strength friction sleeve 5 is equal to the diameter of the anchor rod body 7, and the inner wall of the sleeve is rough and is provided with wedge-shaped friction blocks 11 at equal intervals.

The frustum-shaped friction joint 6 is built into the end of the high-strength friction sleeve 5, and is threadedly connected with one end of the anchor rod body 7. The anchor rod body 7 is a solid rod body with a smooth surface, and its length is greater than that of the high-strength friction sleeve 5. The other end of the anchor rod body 7 is connected with the resistance sleeve 8 as a whole. The resistance casing 8 is a high-strength alloy casing, and its surface is provided with an external thread 13, and its outer diameter gradually changes from the largest point to the same outer diameter as the bolt body 7. The other end of the resistance sleeve 8 is connected with a high-strength drill 9 , and the diameter of the high-strength drill 9 is greater than the outer diameter of the resistance sleeve 8 . Anchor rod rear part then installs bearing plate 4, elastic washer 3, outer nut 2 and plugging nut 1 successively, has guaranteed the integrality of the anchor rod of the present utility model.

In order to realize the large deformation performance of the utility model, the bolt deforms and extends outward after being subjected to tensile stress. The wedge-shaped friction blocks 11 on the inner wall of the barrel are tightly engaged, so that the pressure generated by the deformation of the surrounding rock is released, that is, the high-strength friction sleeve 5 exerts its pressure relief function step by step during the pressure unloading process of the deformation. When the frustum-shaped friction joint 6 reaches the bottom of the high-strength friction sleeve 5, the surrounding rock continues to deform. At this time, because the anchor rod body 7 between the high-strength friction sleeve 5 and the resistance sleeve 8 is relatively smooth, The cohesive force disappears, and the pressure generated by the deformation is jointly borne by the high-strength friction sleeve 5 and the resistance sleeve 8, which increases the effective length of the deformation of the bolt body, that is, during the pressure unloading process of the surrounding rock continuing to deform, the high-strength friction sleeve 5 and the resistance casing 8 jointly play the pressure-relieving effect, and then realize the dual pressure-releasing effect of the utility model.

The anchor rod body 7 is provided with an annular elastic block 10, which is optimally arranged at the junction of the conical friction joint 6 and the anchor rod body 7. The outer diameter of the annular elastic block 10 is smaller than the inner diameter of the section formed by the tip of the wedge-shaped friction block 11 on the inner wall of the high-strength friction sleeve 5 , to buffer the impact force when the frustum-shaped friction joint 6 reaches the bottom and contacts the high-strength friction sleeve 5 .

In order to prevent moisture and soil particles from entering the high-strength friction sleeve 5 and cause internal structure corrosion, a rubber I-shaped ring 12 is installed on the periphery of the round hole at the bottom of the high-strength friction sleeve 5 to ensure the closed state of the sleeve.

Construction technique of the present utility model comprises the following steps:

(1) Put the annular elastic block 10 on one end of the anchor rod body 7, connect the circular frustum-shaped friction joint 6 and the anchor rod body 7, and place the structure through the round hole at the bottom of the high-strength friction sleeve 5, so that the structure is just placed on the high-strength friction sleeve The center of the cylinder 5, and sequentially connect the resistance casing 8 and the high-strength drill bit 9;

(2) Use a special drilling rig to lock the frustum-shaped friction joint 6 and the high-strength friction sleeve 5 together, and drill the connected anchor rod to the specified depth;

(3) Perform pressure grouting on the anchor rod to make the grout completely fill the entire anchor rod body. After the grouting is completed and the grout reaches a certain strength, install the pressure bearing plate 4, elastic washer 3, outer nut 2 and plugging nut 1 in sequence ,fixed.

In the step (1), before installing the high-strength friction sleeve 5, it should be checked whether the inside of the sleeve is clean, and if there are foreign objects, it should be cleaned up in time. In order to prevent moisture and soil particles from entering the high-strength friction sleeve 5 and cause internal structure corrosion, a rubber I-shaped ring 12 is installed on the periphery of the round hole at the bottom of the high-strength friction sleeve 5 to ensure the closed state of the sleeve.

In the step (2), before the anchor rod is drilled, use a special drilling rig to lock the frustum-shaped friction joint 6 and the high-strength friction sleeve 5 together to prevent the frustum-shaped friction joint 6 from colliding with the high-strength friction sleeve 5 during the drilling of the anchor rod. 5 rotate simultaneously. After drilling, clean the borehole.

In the step (3), pressure grouting is applied to the entire length of the anchor rod, so that the grout completely fills the cracks in the surrounding rock around the anchor rod, and the anchor rod and the surrounding rock and soil are bonded together, thereby reinforcing the surrounding rock. When the cement slurry reaches a certain strength, the bearing plate 4 is installed, and each nut is tightened.

Claims (3)

1. A self-propelled large-deformation yielding anchor rod is composed of an outer nut, a pressure bearing plate, a high-strength friction sleeve, an anchor rod body, a resistance sleeve and a high-strength drill bit, and is characterized in that: the high-strength friction sleeve The outer wall is provided with threads, the inner wall is provided with wedge-shaped friction blocks with equal spacing and the same size, and a frustum-shaped friction joint is provided inside the sleeve; the anchor rod body is a smooth rod with threads at both ends, which can realize frustum-shaped friction joints and anti-friction joints. The overall connection of the resistance sleeve; the outer surface of the resistance sleeve is provided with external threads, and the inner surface contains internal threads. The outer diameter of the resistance sleeve is the same as that of the high-strength friction sleeve, and both are smaller than the maximum diameter of the high-strength drill diameter. 2. A self-propelled large deformation yield anchor according to claim 1, characterized in that: the high-strength friction sleeve is a hollow sleeve with an open end and a central hole reserved at the bottom, and the central hole The diameter is equal to the outer diameter of the anchor rod body; the outer wall of the high-strength friction sleeve is provided with threads, and the inner wall is rough and provided with wedge-shaped friction blocks with equal spacing and the same size. 3. A self-propelled large-deformation pressure anchor according to claim 1, characterized in that: the diameter of the lower bottom of the frustum-shaped friction joint is the same as the inner diameter of the high-strength friction sleeve, and the diameter of the upper bottom is larger than the inner diameter of the high-strength friction sleeve. The diameter of the anchor rod body is smaller than the inner diameter of the cross-section formed by the tip of the wedge-shaped friction block on the inner wall of the high-strength friction sleeve; an internal thread with the same diameter as the anchor rod body is left on the upper bottom of the frustum-shaped friction joint; in addition, the outer wall of the friction joint is provided with wedge-shaped The protrusions have the same protrusion angle as the wedge-shaped friction block on the inner wall of the high-strength friction sleeve, and the distances are equal.