CN112879058A - Radial internal expansion resistance-increasing anchor rod cable supporting device and method - Google Patents
Radial internal expansion resistance-increasing anchor rod cable supporting device and method Download PDFInfo
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- CN112879058A CN112879058A CN202110084528.1A CN202110084528A CN112879058A CN 112879058 A CN112879058 A CN 112879058A CN 202110084528 A CN202110084528 A CN 202110084528A CN 112879058 A CN112879058 A CN 112879058A
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- 238000000034 method Methods 0.000 title claims abstract 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract 13
- 239000010959 steel Substances 0.000 claims abstract 13
- 238000004873 anchoring Methods 0.000 claims abstract 3
- 239000011435 rock Substances 0.000 claims abstract 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 238000003756 stirring Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
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- Engineering & Computer Science (AREA)
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- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
本发明提供了一种径向内膨胀增阻锚杆索支护装置及方法，涉及岩土工程支护技术领域，能够实现高性能锚固，增强单根锚索支护性能，且结构精巧，施工速度快，具有自膨胀效应；该装置包括一束钢绞线束，所述钢绞线束的一端依次穿过固定连接套、若干增阻片以及钢套管；所述钢绞线束与所述固定连接套、所述增阻片、所述钢套管均为固定连接；所述钢绞线束的另一端设有托盘结构；所述增阻片为中空结构，整体呈内凸型片状，且内凹面靠近设有托盘结构的一端；在受到巨大拉拔力作用时通过自身膨胀卸压，同时增大抗拉力，避免了锚索锚固失效的发生。本发明提供的技术方案适用于岩层支护的过程中。
The invention provides a radially inner expansion resistance-increasing anchor rod cable support device and method, which relates to the technical field of geotechnical engineering support, can achieve high-performance anchoring, enhance the support performance of a single anchor cable, and has an exquisite structure and easy construction. High speed and self-expansion effect; the device includes a bundle of steel strands, one end of which passes through a fixed connection sleeve, a number of resistance increasing sheets and a steel sleeve in turn; the steel strands are connected to the fixed connection The sleeve, the resistance-increasing sheet, and the steel sleeve are all fixedly connected; the other end of the steel strand bundle is provided with a tray structure; The concave surface is close to the end with the tray structure; when subjected to a huge pulling force, the pressure is relieved by self-expansion, and the tensile force is increased at the same time, so as to avoid the occurrence of anchor failure of the anchor cable. The technical solution provided by the present invention is suitable for the process of rock formation support.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering support, in particular to a radial internal expansion resistance-increasing anchor rod cable support device and method.
Background
The anchor cable support is an important component for reinforcing the rock mass structure of underground engineering, and by means of the anchoring effect of the anchor cables, the mutual coordination of the anchor protection structure and the surrounding rock mass is realized, the overall stability of the underground space is enhanced, and sufficient technical support is provided for the safe construction of the underground engineering. Different types of anchor rod forms are selected according to different supporting requirements in the project site at the present stage, and the anchor rod forms can be divided into strength anchor cables, yield anchor cables, energy-absorbing anchor cables and the like.
Traditional anchor rope supporting construction is end anchor or full anchor structure, and it is extremely easy to take place anchoring agent and rock mass to unstick in the roof stratum migration in-process, leads to the anchor structure of anchor rope to become invalid, especially in the high stress anchor district, the anchor of single anchor rope becomes invalid, very easily causes chain reaction, causes the regional support of working face to become invalid, influences working face safety, threatens working face normal production.
The expansion effect of the existing anchor rod mainly aims at the material expansion, and by means of the specific toughness and high strength characteristic of the anchor cable, the resistance-increasing friction effect is realized, the anchor cable supporting efficiency is enhanced, and a more effective supporting material can be provided for engineering application.
Disclosure of Invention
In view of the above, the invention provides a radial internal expansion resistance-increasing anchor rod cable supporting device and method, which can realize high-performance anchoring, enhance the supporting performance of a single anchor cable, have an exquisite structure and a high construction speed, and have a self-expansion effect. When the anchor cable is under tension, the resistance increasing sheet tends to change from an inward convex structure to a planar structure, the integral structure of the anchor cable expands outwards, the friction effect with the hole wall is increased, the support effect of the anchor cable is strengthened, the friction resistance between the anchor cable and surrounding rock is increased, and the radial self-resistance increasing stabilization effect is achieved.
On one hand, the invention provides a radial internal expansion resistance-increasing anchor rod cable supporting device which is characterized by comprising a steel strand bundle, wherein one end of the steel strand bundle sequentially penetrates through a fixed connecting sleeve, a plurality of resistance-increasing sheets and a steel sleeve; the steel strand bundle is fixedly connected with the fixed connecting sleeve, the resistance increasing sheet and the steel sleeve;
and the other end of the steel strand bundle is provided with a tray structure.
The above-mentioned aspects and any possible implementation manner further provide an implementation manner, wherein the resistance increasing sheet is a hollow structure and has an inward convex sheet shape as a whole. The resistance-increasing sheet can also be other structures capable of generating radial expansion, and can also be an elastic member with certain elasticity.
The above aspects and any possible implementations further provide an implementation where the inner concave surface of the resistance increasing sheet is adjacent to an end where the tray structure is located.
The above aspects and any possible implementations further provide an implementation where the thickness of the resistance increasing sheet is 2 mm. The arrangement distance of the resistance increasing sheets is 2 mm.
The above aspects and any possible implementations further provide an implementation in which the tray structure is fixedly connected to the steel strand bundle.
The above-described aspects and any possible implementations further provide an implementation in which the tray structure includes a sheet-like tray, a male portion, and a threaded barrel; the flaky disc, the outer convex part and the threaded cylinder are sequentially connected; the threaded barrel is externally sleeved with a threaded fastener; the threaded fastener may be a hex bolt.
The above aspect and any possible implementation manner further provide an implementation manner, and the manner in which the sheet-shaped disc, the convex portion and the threaded cylinder are connected in sequence is welding.
The above aspect and any possible implementation manner further provide an implementation manner in which the sheet-shaped disc, the convex portion and the threaded cylinder are connected in sequence in an integrated manner.
In accordance with the above aspect and any one of the possible implementations, there is further provided an implementation in which the tray structure is fixedly connected to the steel strand bundle by welding.
In accordance with the above aspect and any one of the possible implementations, there is further provided an implementation in which the tray structure is directly and fixedly connected to the fixed connection sleeve.
In another aspect, the invention provides a method for using a radially inward-expanding resistance-increasing anchor rod cable supporting device, which is characterized by comprising the following steps:
s1, constructing a plurality of drill holes in the rock mass;
s2, placing an anchoring agent into the drilled hole;
s3, screwing the anchor rod cable supporting device into the drilled hole, and simultaneously stirring and pushing the anchoring agent into the bottom of the drilled hole;
and S4, setting the tension degree of the anchor rod cable support device according to the pre-tightening force requirement.
The above aspects and any possible implementations further provide an implementation in which the preload force is in a range of 100kN to 200 kN.
The above aspects and any possible implementation further provide an implementation manner that the bore diameter of the drill hole is matched with the diameter width of the anchor rod cable support device and is 24 mm-32 mm.
The above-described aspects and any possible implementations further provide an implementation where the drilling depth is L-20mm, where L is the anchor segment length. The anchoring section refers to the length of the steel strand bundle from the tray structure through the fixed connecting sleeve, the resistance increasing sheets and the steel sleeve.
The above aspects and any possible implementations further provide an implementation, L is not less than 1 meter.
Compared with the prior art, the invention can obtain the following technical effects:
(1) the radial self-expansion resistance-increasing effect is realized, the annular pressurization internal resistance is increased, the pressure is relieved by self expansion under the action of huge drawing force, the tensile resistance is increased, and the anchor failure of the anchor cable is avoided;
(2) the radial internal expansion resistance-increasing anchor cable device realizes the close fit of the anchoring device and the surrounding rock structure by means of the migration environment of the surrounding rock, and realizes the exertion of the integral anchoring performance of the anchoring and protecting structure;
(3) the diameter and the size of the anchor cable can be adjusted according to the rock mass distribution in the surrounding rock of the roadway, so that the problem of field processing of the anchor cable structure is facilitated, the waste of materials is reduced, and the anchor cable is more economical for engineering application;
(4) the threaded cylinder and the steel strand form a whole through internal welding, and the tensioning and pre-tightening of the anchor cable are realized through the external tray and the nut, so that the overall efficiency of the anchor cable support is enhanced.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic front view of a radial inward expansion resistance-increasing anchor cable according to an embodiment of the present invention;
fig. 2 is a schematic side view of a radial inward expansion resistance-increasing anchor cable according to an embodiment of the present invention;
fig. 3 is a schematic view of the overall structure of the stressed rear side of the radial inward expansion resistance-increasing anchor cable according to an embodiment of the present invention;
FIG. 4 is a schematic view of the overall structure of a radial inner expansion resistance-increasing anchor cable surrounding rock section provided by an embodiment of the invention;
FIG. 5 is a schematic view of the overall structure of a radial internal expansion resistance-increasing anchor cable surrounding rock stress section provided by an embodiment of the invention;
FIG. 6 is a side view of a radially inwardly expanding resistance-increasing anchor cable sleeve, tray, nut provided in accordance with an embodiment of the present invention;
fig. 7 is an elevation view of a radially inwardly expanding resistance-increasing anchor cable tray provided in accordance with an embodiment of the present invention;
fig. 8(a) is a sectional view of a radially inward expanding resistance-increasing anchor cable resistance-increasing sheet according to an embodiment of the present invention, and fig. 8(b) is a perspective view.
Wherein, in the figure:
the steel-reinforced concrete structure comprises 1-a steel sleeve, 2-a resistance-increasing sheet, 3-a steel strand, 4-a fixed connecting sleeve, 5-a tray structure, 5-1 square discs, 5-2 outer convex parts, 5-3 threaded cylinders and 5-4-hexagonal bolts.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
A radial internal expansion resistance-increasing anchor rod cable supporting device is shown in figures 1-3 and comprises a steel sleeve 1, a plurality of resistance-increasing sheets 2, steel strands 3, a fixed connecting sleeve 4 and a tray structure 5. The steel strand 3 adopts seven strands of steel strands to be bundled in a parallel and tangent mode. The resistance increasing sheet 2 is of an inward convex sheet structure with the thickness of 2mm, and the interior of the resistance increasing sheet is of a hollow structure. The steel strand 3 sequentially passes through the superposed resistance increasing sheets 2 and is connected with the resistance increasing sheets 2 in a welding way. And the resistance increasing sheets 2 are sequentially overlapped and distributed on the steel strand anchoring section in a layered mode. When the anchor cable is subjected to tension, the anchor cable taking the steel strand as a main body tends to move towards the outside, the resistance increasing sheets prevent the anchor cable from moving, the resistance increasing sheets tend to change from an inward convex structure to a plane structure, as shown in fig. 4-5, the overall structure of the anchor cable expands annularly, the friction effect with the hole wall is increased, and the support effect of the anchor cable is strengthened. Fig. 4 to 5 show that the rock mass is dislocated to generate outward pulling force on the whole anchor cable, the anchor cable mainly composed of the steel strand bundle tends to move outwards, and the resistance increasing sheets generate resistance for the inward bulges, so that the resistance increasing sheets change from the inward bulge type structure to the plane structure after being stressed and pulled, and as shown in fig. 4 to 5, the whole anchor cable structure expands annularly. The resistance-increasing sheets are inwards convex towards the interior of the rock body.
The steel sleeve 1 seals and fastens the upper end part of the steel strand 3. The fixed connecting sleeve 4 fastens the tail end of the steel strand 3 in a welding mode. As shown in fig. 6-7, the tray structure 5 comprises a square disc 5-1, an outer convex part 5-2, a threaded cylinder 5-3 and a hexagon bolt 5-4, the square disc 5-1, the outer convex part 5-2 and the threaded cylinder 5-3 are sequentially connected, and the hexagon bolt 5-4 is positioned at the lower end part of the steel strand and is tightly connected with the threaded cylinder 5-3 through threads.
The steel sleeve 1 is small in longitudinal size, the upper end portions of the steel strands 3 are welded, sealed and fastened, and seven strands of steel strands are wrapped and fixed to improve the integral drawing resistance. As shown in fig. 8, the resistance increasing sheets 2 are of an inward convex sheet structure with the thickness of 2mm, the setting distance of the resistance increasing sheets is 2mm, the steel strands 3 penetrate through the resistance increasing sheets and are welded to be connected, the resistance increasing sheets 2 are mutually overlapped and distributed in a layered manner on the anchoring section of the steel strands, when the anchor cable is subjected to tension, the resistance increasing sheets tend to change from the inward convex structure to a planar structure, the whole structure of the anchor cable expands outwards, the friction effect with the hole wall is increased, the supporting effect of the anchor cable is strengthened, the friction resistance between the anchor cable and surrounding rock is increased, and the radial self-resistance increasing stabilizing effect is achieved.
The steel strand 3 adopts seven strand steel strands to be tangent tied in a bundle in parallel, passes and increases the inside welding that passes of resistance piece 2, and both reciprocal anchorages form, and stability between the increase anchor rope, anchor section and increase the non-connected area of resistance piece 2 and be cavity, and aim at increases anchor rope buffering energy-absorbing effect. The non-connecting region refers to a space region between adjacent resistance increasing sheets.
The fixed connecting sleeve 4 is used for welding the tail end of the steel strand 3 and wrapping the seven strands of steel strands integrally under the combined action of the steel sleeve 1, and the upper end and the lower end of the seven strands of steel strands are fixed simultaneously, so that the integrity of the anchor cable is improved.
The tray structure 5 is divided into a square tray 5-1, an outer convex part 5-2 and a threaded cylinder 5-3, the square tray 5-1 is seamlessly connected with a fixed connecting sleeve 4 outside a surrounding rock body during construction, a hexagon bolt 5-4 is connected with the threaded cylinder through threads, the outer convex part 5-2 is tightly fixed with the hexagon bolt 5-4, and the outer convex part 5-2 deforms towards the inside of the surrounding rock when tension is too large to play a role in buffering.
The principle of resistance-increasing internal expansion drawing-resistant action of the invention is as follows:
when the underground rock mass structure is subjected to migration deformation, the anchor cable structure is subjected to radial drawing force and has a tendency of migration along with surrounding rocks, the inward convex resistance increasing sheets 2 are mutually overlapped and uniformly distributed in a layered manner at the anchoring section of the steel strand to prevent sliding and absorb the energy of the migration of the rock mass to deform, the resistance increasing sheets 2 are developed from asymmetric inward convex type to a planar structure, at the moment, the resistance increasing sheets 2 are expanded in the horizontal direction and have a radial self-expansion effect, the overall expansion volume of the anchor cable is increased, the friction effect with the wall of the hole is increased, the anchoring protection effect is strengthened, at the moment, larger drawing force and friction force can be borne, therefore, the integral structure of the anchor cable generates the volume expansion phenomenon, so that under the condition that the anchor cable is subjected to rock burst, through the internal expansion resistance-increasing effect, the self structure is kept from being damaged, the anchor protection failure phenomenon of the anchor cable is avoided, the long-term anchoring of rock stratum control can be realized, and the overall stability of the supporting structure is maintained.
The method for supporting the radially inward expanded resistance-increasing anchor rod cable comprises the following steps:
step 1, drilling a hole with the aperture of 24-32 mm in a rock mass, wherein the drilling depth is the length L +20mm of an anchor cable, an end head margin is reserved for pre-tightening and tensioning the end part, the anchor cable is ensured to penetrate into a stable rock stratum and is not less than 1.0 m, and the length range of the anchor cable is 4-6 m; the length of the anchor cable is the length from the square disc 5-1 to the upper end part of the anchor cable, and the upper end part of the anchor cable is the end inserted into the drill hole.
and 5, withdrawing the anchor rod drilling machine, and repeating the steps 1-4 to construct the next anchor cable.
The radial internal expansion resistance-increasing anchor cable supporting method and device provided by the invention are suitable for the field of geotechnical engineering anchor cable supporting and can be used for section supporting in underground engineering such as tunnels, mines and the like.
The embodiments of the present application provide a radially inward expanding and resistance-increasing anchor rod cable supporting device and method, which are described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. A radially inner-expansion resistance-increasing anchor rod cable supporting device is characterized by comprising a steel strand bundle, wherein one end of the steel strand bundle sequentially penetrates through a fixed connecting sleeve, a plurality of resistance increasing sheets and a steel sleeve; the steel strand bundle is fixedly connected with the fixed connecting sleeve, the resistance increasing sheet and the steel sleeve;
and the other end of the steel strand bundle is provided with a tray structure.
2. The radially inwardly expanding drag-increasing bolt and cable support apparatus of claim 1, wherein said drag-increasing sheet is a hollow structure, and has an inwardly convex sheet shape as a whole.
3. The radially inwardly expanding drag-increasing chock cable support device according to claim 2, wherein the inner concave surface of said drag-increasing piece is adjacent the end where the tray structure is located.
4. The radially inwardly expanding drag-increasing bolt line support apparatus of claim 2, wherein said drag-increasing pieces are 2mm thick and 2mm apart.
5. The radially inwardly expanding drag-increasing hawser support of claim 1, wherein the tray structure is affixed to the steel strand bundle.
6. The radially inwardly expanding drag-increasing bolt line support apparatus of claim 1, wherein said tray structure comprises a sheet-like disc, a male portion and a threaded barrel; the flaky disc, the outer convex part and the threaded cylinder are sequentially connected; the threaded barrel is externally sleeved with a threaded fastener.
7. The radially inwardly expanding drag-increasing chock cable support device of claim 5, wherein said tray structure is fixedly connected to said steel strand bundle by welding.
8. The radially inwardly expanding drag-increasing rockbolt cable support apparatus according to claim 1, wherein the tray structure is directly affixed to the fixed connection sleeve.
9. A method for using a radially inward expansion drag-increasing anchor rod cable support device is characterized by comprising the following steps:
s1, constructing a plurality of drill holes in the rock mass;
s2, placing an anchoring agent into the drilled hole;
s3, screwing the anchor rod cable supporting device into the drilled hole, and simultaneously stirring and pushing the anchoring agent into the bottom of the drilled hole;
and S4, setting the tension degree of the anchor rod cable support device according to the pre-tightening force requirement.
10. The use method of the radial inner expansion drag-increase anchor rod and cable support device according to claim 9, wherein the pretightening force is in the range of 100kN to 200 kN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110084528.1A CN112879058A (en) | 2021-01-21 | 2021-01-21 | Radial internal expansion resistance-increasing anchor rod cable supporting device and method |
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| CN202110084528.1A CN112879058A (en) | 2021-01-21 | 2021-01-21 | Radial internal expansion resistance-increasing anchor rod cable supporting device and method |
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| CN108316957A (en) * | 2018-02-09 | 2018-07-24 | 成都广雄科技有限公司 | A kind of resistance-enlarging-type anchor pole |
| CN207960653U (en) * | 2018-02-26 | 2018-10-12 | 山东科技大学 | A kind of hollow grouting cable anchor of push-press type only starches structure |
| CN208792316U (en) * | 2018-06-01 | 2019-04-26 | 甘肃省合作早子沟金矿有限责任公司 | A kind of firm anchor rod device |
| CN108756979A (en) * | 2018-06-29 | 2018-11-06 | 武汉科技大学 | A kind of overall length reverse wedge formula prestressed anchor and its application method |
| CN208518692U (en) * | 2018-07-15 | 2019-02-19 | 山东科技大学 | A kind of intumescent combination grouted anchor bar |
| CN210714744U (en) * | 2019-09-18 | 2020-06-09 | 王福泉 | Supporting anchor rod fixing structure for coal mine tunnel |
| CN212054749U (en) * | 2020-04-16 | 2020-12-01 | 贵州省交通规划勘察设计研究院股份有限公司 | Hollow grouting type support anchor rod |
| CN111648804A (en) * | 2020-06-11 | 2020-09-11 | 新汶矿业集团有限责任公司华丰煤矿 | Resistance-increasing deformation anchor cable for deep yielding support and its assembly and working method |
| CN111706374A (en) * | 2020-06-30 | 2020-09-25 | 河海大学 | An anchor head expansion resistance-increasing type can drain multi-stage pressure anchor rod |
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Application publication date: 20210601 |