CN205172612U - It presses large deformation stock to increase to hinder to let - Google Patents

Abstract

The utility model discloses a large-deformation anchor rod with increasing resistance and yielding pressure, which is composed of a deformation spring, an anchor rod, a fixed ball and a connecting sleeve; the deformation spring adopts a high-strength tension spring; It is a hollow elliptical metal sphere, and they all have externally threaded connectors; through the processing of internally threaded connecting sleeves, the deformation spring and the anchor rod are sequentially connected between the two fixed balls to form a resistance-increasing and pressure-increasing The structural unit of the deformed anchor rod; assemble several of the above-mentioned units according to the anchoring depth or length, and connect a section of anchor rod at the outermost end, which is used to install the anchor tray and nut, forming a large deformed anchor rod with increased resistance and pressure . The utility model can be stretched and deformed while the resistance increases steadily when the surrounding rock undergoes large deformation, and effectively maintains the stability of the surrounding rock.

Description

An Anchor Rod with Increased Resistance and Large Deformation under Pressure

technical field

The utility model relates to an anchor rod used for tunnel engineering support, in particular to a large-deformation anchor rod with the function of increasing resistance and allowing pressure.

Background technique

Bolt shotcrete support is an important support method in tunnel engineering, and anchor rod is an important support material. In the construction of modern tunnels, the geological and stratigraphic conditions that the tunnel passes through are becoming more and more complex, and the surrounding rocks often show the characteristics of large deformation, and the stability of the surrounding rocks is becoming more and more prominent. However, the existing bolts have poor deformation capacity and cannot adapt to the large deformation characteristics of the surrounding rock. When the large deformation of the surrounding rock exceeds the capacity range that the bolt can bear, it will easily lead to the failure of the bolt support system and the instability of the surrounding rock. , the tunnel structure is damaged.

In order to adapt to the characteristics of large deformation of surrounding rock and overcome the disadvantages of poor deformation ability of existing traditional bolts, large deformation bolts have appeared. For example, patent 201110061360.9 provides a friction sleeve type large deformation anchor rod, but it uses mechanical friction to realize the deformation and elongation of the anchor rod, and the structure is relatively complicated; 201210139092.2 provides a new type of high strength constant resistance large deformation anchor rod, which requires It is inconvenient to carry out reaming.

Utility model content

The purpose of the utility model is to provide an anchor rod with increased resistance and large deformation to adapt to the characteristics of large deformation of surrounding rock.

In order to achieve the above purpose, the structure of a large-deformation anchor rod with increased resistance and pressure reduction in the utility model is composed of a deformation spring, an anchor rod, a fixed ball and a connecting sleeve; it is characterized in that the deformation spring adopts high-strength tensile Spring; the anchor rod is a solid metal rod; the fixed ball is a hollow elliptical metal sphere, and they all have externally threaded connectors; through the processing of the connecting sleeve with internal thread, the deformation spring is sequentially connected between the two fixed balls , Anchor rod, forming a structural unit that increases resistance and allows pressure and large deformation of the anchor rod; assemble several of the above-mentioned units according to the anchoring depth or length, and connect a section of anchor rod at the outermost end to install the anchor rod. Nuts form an anchor rod that increases resistance and allows pressure to deform.

In order to ensure the anchoring effect of the fixing ball, the diameter of the fixing ball is slightly smaller than the diameter of the drilled hole.

The working principle of the increased resistance to allow pressure and large deformation anchor is as follows:

The bolt adopts full-length bonding. When the surrounding rock is deformed and cracks are generated, the support of the anchor rod and the deformed spring will fail due to the generation of cracks, and the pressure of the surrounding rock will gradually increase. When the pressure of the surrounding rock reaches a certain level, the anchor rod The deformation springs at both ends produce tensile deformation under its action, and the surrounding rock pressure is released; the deformation spring generates tension after stretching, the greater the deformation, the greater the tension generated, and the stronger the ability to control the surrounding rock; due to the deformation spring The fixed balls at both ends are still fixed in the anchoring agent, and can still play a supporting role, so that the anchor rod can maintain the integrity of the supporting system while producing local deformation and compression, and better maintain the stability of the surrounding rock. In a word, the anchor bolt yields pressure through spring deformation and increases resistance at the same time, allowing a certain amount of deformation of the surrounding rock to achieve stability during the resistance process, and the anchor bolt will not fail due to excessive load.

The utility model has the advantages of a large-deformation anchor rod with increased resistance and pressure:

(1) The use of deformation springs can absorb the deformation energy of the surrounding rock and convert it into resistance to the surrounding rock, so the greater the deformation of the surrounding rock, the stronger the support ability of the bolt to the surrounding rock;

(2) The bolt connection method is simple, easy to assemble, and the length of the bolt can be adjusted according to the anchoring depth;

(3) The construction of this method is convenient and fast, and there is no need to replace construction tools and equipment in the middle of construction.

Description of drawings

Fig. 1 is a schematic diagram of a large-deformation anchor rod with increased resistance and yielding pressure of the present invention.

Legend: 1-deformation spring; 2-anchor rod; 3-fixed ball; 4-connecting sleeve.

detailed description

As shown in Figure 1, a large-deformation anchor rod with increased resistance and pressure is composed of a deformation spring 1, an anchor rod 2, a fixed ball 3 and a connecting sleeve 4; the deformation spring 1 adopts a high-strength tension spring; The rod 2 is a solid metal rod body; the fixed ball 4 is a hollow elliptical metal sphere, and they all have externally threaded connectors; through the processing of the connecting sleeve 4 with internal threads, the two fixed balls 3 are sequentially connected and deformed The spring 1 and the anchor rod 2 form a structural unit that increases resistance and allows pressure and large deformation of the anchor rod; assemble several of the above units according to the anchoring depth or length, and connect a section of anchor rod 2 at the outermost end to install the anchor The tray and nut of the rod form an anchor rod that increases resistance and allows pressure to deform greatly.

During construction, first assemble the deformed spring 1, the anchor rod 2, and the fixed ball 3 through the connecting sleeve 4, then drill holes according to actual needs, and then fill the holes with grouting. After the grouting is completed, the anchor rods Insert the drilled hole, install the pallet nut, and the bolt is installed.

Claims (1)

1. increase resistance and allow a pressure large deformation anchor rod, it is characterized in that, it is made up of distortion spring, anchor rod, fixing ball and branch sleeve; Distortion spring adopts high-strength extension spring, and anchor rod is the solid metal body of rod, and fixing ball is the oval metal ball body of hollow, and they are all with externally threaded connector; By processing female branch sleeve, be linked in sequence distortion spring, anchor rod between two fixing balls, forms one and increase the element of construction hindering and allow and press large deformation anchor rod; Assemble several said units according to anchorage depth or length, and connect one section of anchor rod again in outermost termination, for pallet and the nut of skyhook, formed and increase resistance and allow pressure large deformation anchor rod.