CN219711555U - Large-deformation yielding anchor rod with prestress and constant resistance - Google Patents
Large-deformation yielding anchor rod with prestress and constant resistance Download PDFInfo
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- CN219711555U CN219711555U CN202320667187.5U CN202320667187U CN219711555U CN 219711555 U CN219711555 U CN 219711555U CN 202320667187 U CN202320667187 U CN 202320667187U CN 219711555 U CN219711555 U CN 219711555U
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- 238000000034 method Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 abstract description 21
- 238000010276 construction Methods 0.000 description 6
- 238000004873 anchoring Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a prestressed constant-resistance large-deformation yielding anchor rod, which comprises a constant-resistance sleeve and a rod body, wherein the inner surface of the constant-resistance sleeve is carved with inner ribs, a crack is longitudinally arranged, the tail part of the rod body is carved with outer ribs corresponding to the inner surface of the sleeve, the outer ribs and the inner ribs are mutually matched, a nut and a tray are sequentially arranged at the periphery of the end part of the constant-resistance sleeve, which is close to the same end of the tail part of the rod body, and the other end of the rod body, which is away from the nut, is provided with a cone body, wherein the density of the ribs and the width of the crack determine the working resistance in the yielding process, the length of the constant-resistance sleeve determines the yielding amount, and the balance point of the yielding amount and the working resistance needs to be determined according to the deformation condition of surrounding rocks on site.
Description
Technical Field
The utility model belongs to the technical field of tunnel engineering, and particularly relates to a constant-resistance large-deformation yielding anchor rod with prestress.
Background
In the underground engineering construction of traffic tunnels, coal mine roadways, hydropower stations and the like, the anchor rods are the supporting equipment with the widest application and the best effect. Along with the strong development of infrastructures and the stronger energy demands of China, the construction depth of the engineering is larger and larger, the facing ground stress is larger and larger, and if the construction is in a water-swellable stratum such as red soft rock in the southwest area of China, surrounding rocks often show the characteristic of large deformation under the conditions, and the surrounding rocks are particularly characterized by high deformation rate, large displacement and difficult stability in a short time. The supporting system is challenged, if the supporting system cannot adapt to the situation and effectively control surrounding rock deformation in time, accidents such as anchor rod breakage, arch frame deformation and tunnel collapse can possibly occur, the safety construction of the tunnel is affected, the tunnel becomes a bottleneck of the whole engineering, and huge economic loss and even life safety of people are threatened. According to the anchor bolt support characteristic curve and the surrounding rock convergence curve, the deformation of the anchor bolt can be obviously reduced when the two curves are intersected, so that the anchor bolt is in a relatively safe working state, the surrounding rock is required to be allowed to deform, a yielding process matched with the process is provided by the anchor bolt, and the working resistance is required to be kept constant in the yielding process, so that the deformation of the surrounding rock is effectively controlled.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a constant-resistance large-deformation yielding anchor rod, which comprises a rod body, a constant-resistance sleeve and a tray, wherein the rod body, the constant-resistance sleeve and the tray are coaxially arranged, the constant-resistance sleeve is arranged on the outer periphery of the tail part of the rod body, the inner periphery of the Zhou Heheng-resistance sleeve outside the tail part of the rod body is respectively provided with an outer rib and an inner rib which are convenient for keeping constant working resistance in the yielding process, the outer rib and the inner rib are mutually matched, the constant-resistance sleeve is axially provided with a crack for providing an expansion space when the outer rib and the inner rib are mutually staggered, the tray is arranged on the outer periphery of the constant-resistance sleeve, the tail part of the constant-resistance sleeve is also provided with an external thread, and the external thread is screwed with a nut.
Further, the end part of the other end of the rod body, which is away from the constant-resistance sleeve, is integrally provided with a cone.
Further, the depth of the internal thread of the nut is larger than the height of the protrusion of the external thread at the tail part of the constant-resistance sleeve.
Further, the constant resistance sleeve is made of high strength steel.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model provides the crack-expandable constant-resistance sleeve, overcomes the dilemma of high material requirements in the existing yielding support mode, and achieves the effect of controlling large deformation by using common steel materials by improving the structure.
2. The pressure-yielding anchor rod with the prestress constant resistance large deformation can flexibly adjust the pressure-yielding amount according to the actual condition of the site so as to meet the requirements of different deformation amounts of the site.
3. The utility model has the advantages that the prestress can be timely applied when the prestress constant-resistance large deformation yielding anchor rod is installed, and the overlarge deformation caused by the fact that surrounding rock cannot be timely supported is prevented.
4. The utility model has the advantages of stable and reliable pressure anchor rod with prestress, constant resistance and large deformation, no worry about breaking and failure in the use process, and safe construction.
Drawings
FIG. 1 is a schematic diagram of a structure of a prestressed constant-resistance large-deformation yielding anchor rod;
FIG. 2 is a schematic view of the internal rib structure of the prestressed large-deformation yielding anchor rod with prestressing force.
In the figure: 1: rod body, 2: constant-resistance sleeve, 3: tray, 4: nut, 11: outer rib, 21: an inner rib.
Detailed Description
A description of a prestressed constant resistance large deformation yield anchor according to the present utility model will be made in more detail with reference to the accompanying drawings, in which preferred embodiments of the present utility model are shown, it being understood that the present utility model described herein may be modified by those skilled in the art while still achieving the advantageous effects of the present utility model, and therefore, the following description should be construed as broadly known to those skilled in the art without limiting the present utility model.
As shown in figures 1 and 2, the pressure-letting anchor rod with prestress constant resistance large deformation comprises a rod body 1, a constant resistance sleeve 2, a nut 4 and a tray 3, wherein all parts are coaxially arranged, a cone is arranged at one end of the rod body 1, and the cone is used for reducing resistance encountered in the jacking process in a drilling hole and simultaneously rapidly destroying an anchoring agent. The constant-resistance sleeve 2 is made of ultra-high strength steel, the diameter of the constant-resistance sleeve is slightly larger than that of the rod body 1, the constant-resistance sleeve 2 is arranged on the periphery of the other end of the rod body 1, a crack is formed in the periphery of the constant-resistance sleeve 2, the length of the crack is identical to that of the constant-resistance sleeve 2, and an external thread is arranged at the tail of the constant-resistance sleeve 2 and used for screwing the nut 4.
The inside of the constant-resistance sleeve 2 is provided with an inner rib 21, and correspondingly, the periphery of the corresponding end of the rod body 1 is provided with an outer rib 11, and the outer rib 11 and the inner rib 21 are mutually matched, and the specific appearance is that the protruding height and the width of the outer rib 11 are consistent with those of the inner rib 21 of the constant-resistance sleeve 2.
When the surrounding rock is greatly deformed, the pressure of the surrounding rock is transmitted to the resistance-increasing sleeve through the tray 3, so that the resistance-increasing sleeve and the rod body 1 relatively slide, the expansion deformation of the constant-resistance sleeve 2 can be caused when the protruding position of the rib line 21 in the constant-resistance sleeve 2 meets the protruding position of the rib line 1 in the sliding process, and when the stress is large enough, the crack can be opened, so that the dislocation of the inner rib line 21 and the outer rib line 11 can be caused, the purpose of yielding is achieved, and the anchoring of the surrounding rock can be continued. The maximum opening amount of the crack depends on the size of a nut at the tail part of the constant-resistance sleeve, when the set yielding amount is reached, the rod body and the constant-resistance sleeve do not generate relative displacement any more, and the method is suitable for tunnel construction with the deformation amount within 1 m.
When the deformation of the surrounding rock is larger, larger yielding capacity can be realized by increasing the length of the constant-resistance sleeve.
The density and the crack width of the inner rib 21 or the outer rib 11 determine the working resistance in the yielding process, the length of the constant-resistance sleeve 2 determines the yielding amount, and the balance point of the yielding amount and the working resistance needs to be determined according to the deformation condition of surrounding rocks on site, namely, the yielding amount and the working resistance are determined according to the pressure-deformation curve of the surrounding rocks, so that the design parameters such as the sleeve length, the rib density, the crack width and the like are determined through experiments.
The application steps of the utility model are as follows:
the first step: the magnitude of the yielding and working resistance is determined by the surrounding rock pressure-deformation curve, and the length parameter of the constant-resistance sleeve 2, the density parameters of the inner ribs 21 of the constant-resistance sleeve 2 and the outer ribs 11 of the rod body 1 and the width parameter of the crack of the constant-resistance sleeve 2 are determined by experiments.
And a second step of: according to the determined parameters, selecting a rod body 1, a constant-resistance sleeve 2 and a nut 4, assembling the rod body 1 in advance, expanding the sleeve of the constant-resistance sleeve 2, and penetrating the rod body 1 through the constant-resistance sleeve 2.
And a third step of: and (3) punching holes in the support roadway after the tunnel is excavated, wherein the diameter of the drilled holes is matched with the diameter of the rod body 1, withdrawing the drill rod after the drilled holes reach the bottom, replacing a large-size drill bit to thicken the hole opening of the reaming section, and matching the thickened diameter with the outer diameter of the constant-resistance sleeve 2.
Fourth step: and (3) injecting an anchoring agent into the drilled hole, installing the assembled rod body 1 in the drilled hole after penetrating through the tray 3 towards the hole bottom, timely screwing the nut 4 to fix the assembled rod body, screwing the nut 4 by a drilling machine before the anchoring agent is solidified, achieving the designed pretightening force, and reserving a space for expanding a sleeve crack because the screw depth of the nut 4 is larger than the height of the tail screw protrusion of the constant-resistance sleeve 2.
Fifth step: under the action of surrounding rock pressure, the constant-resistance sleeve pipe 2 and the rod body 1 slide relatively, the surrounding rock pressure gradually decreases along with the increase of the deformation of the surrounding rock, the surrounding rock is not deformed when the surrounding rock pressure is equal to the supporting resistance, and the pressure is ended.
The foregoing is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any person skilled in the art will make any equivalent substitution or modification to the technical solution and technical content disclosed in the utility model without departing from the scope of the technical solution of the utility model, and the technical solution of the utility model is not departing from the scope of the utility model.
Claims (4)
1. The utility model provides a take prestressing force constant resistance large deformation to let pressure stock, its characterized in that, including the body of rod, constant resistance sleeve pipe and the tray of coaxial setting, the constant resistance sleeve pipe is located body of rod afterbody periphery, body of rod afterbody periphery with constant resistance sleeve pipe inner circumference is equipped with the external rib line and the interior rib line of being convenient for keep invariable operating resistance in letting the pressure in-process respectively, external rib line with interior rib line mutually support, the constant resistance sleeve pipe is equipped with along the axial and works as the crack that provides expansion space when external rib line and interior rib line take place the dislocation each other, the tray is located constant resistance sleeve pipe periphery, constant resistance sleeve pipe's afterbody still is equipped with the external screw thread, the external screw thread is twisted soon and is had the nut.
2. The large deformation yielding anchor rod with prestress according to claim 1, wherein the end part of the other end of the rod body, which is away from the constant resistance sleeve, is integrally provided with a cone.
3. The prestressed large-deformation yielding anchor rod of claim 1, wherein the depth of the internal thread of the nut is greater than the height of the protrusion of the external thread at the tail of the constant-resistance sleeve.
4. The prestressed high-resistance deformation yield anchor of claim 1, wherein said constant-resistance sleeve is made of high-strength steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320667187.5U CN219711555U (en) | 2023-03-30 | 2023-03-30 | Large-deformation yielding anchor rod with prestress and constant resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320667187.5U CN219711555U (en) | 2023-03-30 | 2023-03-30 | Large-deformation yielding anchor rod with prestress and constant resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219711555U true CN219711555U (en) | 2023-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320667187.5U Active CN219711555U (en) | 2023-03-30 | 2023-03-30 | Large-deformation yielding anchor rod with prestress and constant resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219711555U (en) |
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2023
- 2023-03-30 CN CN202320667187.5U patent/CN219711555U/en active Active
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