CN104895597B - A kind of large deformation constant-resistance periodicity pressure-relieving achor bar - Google Patents

Abstract

The invention discloses a large-deformation constant-resistance periodic yielding anchor rod. It includes an anchor rod body, a sleeve, an elastic shell, an annular lock, a wedge, a rubber pad, a backing plate and a nut. There is a rectangular wedge groove. The sleeve includes a hollow sleeve section and a solid section. There are symmetrical slots on the left and right sides of the hollow sleeve section. External threads are processed on the outer surface of the end of the solid section. The hollow sleeve section It is set on the corrugated surface rod body section of the anchor rod, and the outer side of the hollow sleeve section is equipped with an annular elastic shell. The annular elastic shell is equipped with a ring lock. There is a rubber pad between the solid section of the sleeve and the backing plate, and the backing plate is fixed with nuts. At the end of the solid section of the sleeve. When the invention is impacted, it can realize instantaneous large deformation without destroying the overall structure of the anchor rod, so that the anchor rod still has bearing capacity, thereby realizing the effect of impact resistance.

Description

A Large Deformation Constant Resistance Periodic Yield Anchor Rod

technical field

The invention relates to an anchor rod, in particular to a large-deformation constant-resistance periodic yielding anchor rod.

Background technique

Anchor rods are widely used in underground engineering as an efficient support structure. With the depletion of shallow resources, more and more metal and non-metal mines have entered deep mining. The deep complex physical environment such as: high stress, high osmotic pressure and strong mining disturbance and other factors cause engineering problems such as large deformation, long deformation duration and increased frequency of rock burst in deep rock mass. Ordinary anchor bolts have insufficient elongation, reduced strength after extension, and lack of impact resistance, which can no longer meet the requirements of high resistance yield and impact resistance for deep rock mass support.

Contents of the invention

In order to solve the above technical problems, the present invention provides a high-resistance yielding bolt with good impact resistance and large deformation constant resistance periodic yielding anchor.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a large deformation constant resistance periodic pressure anchor rod, including the anchor rod body, sleeve, elastic shell, ring lock, wedge, rubber pad, backing plate and nut, the One end of the anchor rod body is provided with a rectangular wedge groove. The sleeve includes a hollow sleeve section and a solid section. There are symmetrical slots on the left and right sides of the hollow sleeve section. The size of the slot is the same as that of the end of the anchor rod body. The wedge on the head is matched, the outer surface of the end of the solid section is processed with external threads, the hollow sleeve section is sleeved on one end of the anchor rod body, and the outer side of the hollow sleeve section is covered with an annular elastic shell, and the annular elastic shell is axially opened. A slot, an annular lock is arranged on the annular elastic shell, a rubber pad is arranged between the solid section of the sleeve and the backing plate, and the backing plate is fixed to the end of the solid section of the sleeve with nuts.

In the above-mentioned large-deformation constant-resistance periodic yielding bolt, the bolt body includes a common bolt body section and a corrugated surface body section, a rectangular wedge groove is provided at the end of the corrugated surface section, and the hollow sleeve The inner surface of the barrel section is corrugated and matches the shape of the corrugated surface of the shank portion of the bolt.

In the above-mentioned large-deformation constant-resistance periodic pressure anchor rod, the elastic shell includes a constant-diameter section and a gradually-increasing-diameter section, but the inner diameter of the elastic shell at both ends is consistent with the outer diameter of the hollow sleeve section.

In the above-mentioned large-deformation constant-resistance periodic yielding bolt, the wedge includes a rectangular section and a fan-shaped section.

The above-mentioned large deformation and constant resistance periodically yields to the anchor rod, and the annular elastic shell wraps the hollow sleeve section.

Compared with the existing technology, the beneficial effect of the present invention is: the present invention provides greater radial pressure through the mutual fit between the corrugated rod body and the sleeve with the corrugated inner surface, and adopts a high-strength elastic shell , when the surrounding rock deformation bulges out and the deformation sleeve part and the anchor rod body slip relative to each other, there is a gradually increasing frictional resistance (in one wave band). After the relative displacement exceeds one or several wave bands, the stress is unloaded and the elastic shell rebounds Always maintain a certain radial pressure, so that the bolt has periodically increased frictional resistance. When the anchor rod is impacted, it can achieve instantaneous large deformation (not exceeding the maximum deformation of the anchor rod) without destroying the overall structure of the anchor rod, so that the anchor rod still has bearing capacity, thereby realizing the effect of impact resistance. When the anchor reaches the maximum deformation, the ring lock locks the elastic shell, the hollow sleeve and the corrugated surface rod so that the rod will not be separated from the sleeve (the anchor reaches the maximum anchoring force at this time).

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a structural schematic diagram of the anchor rod body in the present invention.

Fig. 3 is a sectional view of I-I in Fig. 2 .

Fig. 4 is a structural schematic diagram of a wedge in the present invention.

Fig. 5 is a schematic structural view of the sleeve in the present invention.

Fig. 6 is a schematic structural view of the elastic shell in the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1-6, Figure 1 is a schematic structural view of the present invention. The present invention includes an anchor rod body 1, a sleeve 2, an annular elastic shell 3, an annular lock 4, a wedge 5, a rubber pad 6, a backing plate 7 and a nut 8. The structure of the anchor rod body 1 is shown in Figure 2, which includes a common anchor rod body segment 101 and a corrugated surface rod body segment 102. The end of the corrugated surface rod body segment 102 is strengthened and has a rectangular wedge groove 103; The structure of the wedge 5 is shown in FIG. 4 , the wedge 5 includes a rectangular section 501 and a sector section 502 . The structure of the sleeve 2 is shown in Figure 5, the sleeve 2 includes a hollow sleeve section 201 and a solid section 202, the solid section 202 has an external thread 205 on the surface at a certain distance from the end, and the inner surface of the hollow sleeve section 201 is It is a corrugated inner surface 203, and the end is a large-diameter end, and wedge slots 204 are symmetrically opened. As shown in FIG. 6 , the annular elastic shell 3 includes a gradually increasing diameter section 301 and a constant diameter section 302 , and has a wedging slot 303 ; the annular lock 4 is a high-strength annular lock.

In the present invention, the connection between the ordinary anchor rod body section 101 and the corrugated surface rod body section 102 is strengthened to ensure that the joint is not a dangerous area for anchor rod fracture. The corrugated surface rod body section 102 has a reinforced end of a rectangular wedge groove to ensure that it is not easily deformed and damaged under pressure.

In the present invention, the annular elastic shell 3 is divided into a constant-diameter section 302 and a progressively-increasing diameter section 301. The purpose is that when the annular lock is in the constant-diameter section, the elastic shell can be opened freely to realize the large deformation of the anchor rod to allow pressure Function, when the ring lock is in the gradually increasing diameter section, the radial deformation of the elastic shell and the hollow sleeve is locked, so that the corrugated rod and the hollow sleeve cannot be separated due to relative displacement.

Assembly installation process of the present invention:

Firstly, the corrugated surface rod body section 102 of the anchor rod body 1 is put into the hollow sleeve section 201 of the sleeve 2 , so that the rectangular wedge groove 103 is aligned with the wedge slot groove 204 . Then one end of the increasing diameter section of the annular elastic shell 3 is inserted from one end of the solid section 202 of the sleeve 2 to the large diameter end of the hollow sleeve section 201 . The ring lock 4 is also inserted from one end of the solid section 202 of the sleeve 2 and placed on the equal-diameter section 302 of the annular elastic shell 3 . The wedge 5 is inserted into the rectangular wedge groove 103 through the wedge groove 303 and the wedge groove 204, and is wedged tightly by assembly stress. Put the above parts into the anchor holes with different diameters of the anchor rods (the anchor rod holes are concentric anchor rod holes, the diameter of the inner section is smaller, and the diameter of the section near the hole is larger), and the ordinary anchor rod body part is put into a small diameter bolt holes, and the rest are placed in large diameter bolt holes. Finally, install the rubber pads and nuts in sequence as shown in Figure 1.

The principle of the periodic resistance increase of the present invention to allow pressure and shock resistance:

When the rock mass is deformed, the bolt body 1 and the sleeve 2 move relatively, and the contact part between the two is a corrugated contact surface, and the frictional resistance gradually increases under the radial pressure of the elastic shell during the relative movement , when the relative displacement exceeds a band length, the radial stress is suddenly unloaded, and the elastic shell rebounds and enters the next resistance-increasing cycle. In addition, since the deformation of the anchor rod of the present invention is achieved through periodic changes in the structure, it can achieve large deformation in a short period of time without destroying the structure of the rod body when there is impact ground pressure, and has the effect of impact resistance to a certain extent .

Claims (4)

1. a kind of large deformation constant-resistance periodicity pressure-relieving achor bar, it is characterised in that：Including anchor rod body, sleeve, cyclic spring shell, ring Shape lockset, chock, rubber blanket, backing plate and nut, the anchor rod body include common bolt body of rod section, the corrugated surface body of rod Section, corrugated surface body of rod section termination is provided with a rectangular wedge groove, and the sleeve includes cannulated sleeve section and solid-section, hollow sleeve Cylinder section inner surface is corrugated, and matches with the shape of the corrugated surface of anchor rod body part, in cannulated sleeve section or so There is a symmetrical slot on both sides, and slot size matches with the chock on the anchor rod body termination, the appearance of solid-section termination External screw thread is machined with face, cannulated sleeve section is enclosed on one end of anchor rod body, and cannulated sleeve section outer sheath is equipped with cyclic spring shell, Cyclic spring columella is provided with circular lock to slot, cyclic spring shell is provided with, and rubber is provided between sleeve solid-section and backing plate Pad, and backing plate is fixed on sleeve solid-section termination with nut.

2. large deformation constant-resistance periodicity pressure-relieving achor bar according to claim 1, it is characterised in that：The cyclic spring shell bag Equal diameter section and incremental diameter segment are included, but the internal diameter and the external diameter of cannulated sleeve section of two ends elastic container are in the same size.

3. large deformation constant-resistance periodicity pressure-relieving achor bar according to claim 1, it is characterised in that：The chock includes rectangle Section and fan-shaped section.

4. large deformation constant-resistance periodicity pressure-relieving achor bar according to claim 1, it is characterised in that：The cyclic spring shell bag Wrap cannulated sleeve section.