CN113737788B

CN113737788B - Assembly type multi-purpose hollow grouting anchor rod with densely-distributed holes and bifurcations and construction method thereof

Info

Publication number: CN113737788B
Application number: CN202111178495.3A
Authority: CN
Inventors: 黄金坤; 钱元弟; 程攀; 胡为俊
Original assignee: China MCC17 Group Co Ltd
Current assignee: China MCC17 Group Co Ltd
Priority date: 2021-10-10
Filing date: 2021-10-10
Publication date: 2023-03-31
Anticipated expiration: 2041-10-10
Also published as: CN113737788A

Abstract

The invention discloses an assembled multi-purpose hollow grouting anchor rod with densely distributed holes and bifurcations and a construction method thereof, and belongs to the field of geotechnical engineering anchoring. The grouting anchor rod comprises an anchor rod body, wherein the outer wall of the anchor rod body is provided with a plurality of groups of rod body grouting holes communicated with an inner cavity, a plurality of groups of sleeves are arranged along the height direction of the anchor rod body at intervals in a matching manner, a plurality of groups of telescopic rods are uniformly arranged at intervals along the circumferential direction outside each group of sleeves, and the wall surface of each telescopic rod is also provided with the grouting hole communicated with the inner cavity of the anchor rod body. The grouting anchor rod structure disclosed by the invention overcomes the problem of poor application performance of conventional anchor rod support in the prior art, is special in structural design, can effectively increase the grouting consolidation range of the grouting anchor rod, forms a variable-section grouting consolidation support section, fully exerts the friction effect between the grouting anchor rod and a support body, and improves the support and anti-floating effects of the grouting anchor rod.

Description

Assembly type multi-purpose hollow grouting anchor rod with densely-distributed holes and bifurcations and construction method thereof

Technical Field

The invention relates to the technical field of geotechnical engineering anchoring, in particular to an assembled multi-purpose hollow grouting anchor rod with densely distributed holes and bifurcations and a construction method thereof.

Background

The anchor bolt support is a reinforcing support mode adopted in surface engineering such as geotechnical slopes and deep foundation pits and underground chamber construction such as tunnels and stopes. Generally, a pole column is made of metal, wood, polymer or other materials, and is driven into a hole drilled in advance in an earth surface rock mass or a rock mass around a chamber, and a suspension effect, a combination beam effect and a reinforcing effect are generated by utilizing the special structures of the head part and the pole body and a tail supporting plate (which can be not used) or combining surrounding rocks and a stable rock mass by depending on the bonding action, so as to achieve the purpose of supporting.

Along with the development of engineering construction scale, the construction method is limited by unfavorable geological conditions such as underground water, weak stratum, fractured rock mass, surrounding rock fault and the like, the suspension effect, the combination beam effect and the reinforcement effect of the conventional anchor rod support cannot be developed, and the method is applied to tunnel, foundation pit and side slope support engineering with complex geological conditions and poor surrounding rock lithology, cannot ensure the stability of a support structure and the safety of constructors, and is not beneficial to the control of construction cost.

Through retrieval, a large number of patents related to anchor bolt supporting technology exist, such as Chinese patent application numbers: 202110566836.8, the name of the invention is: the utility model provides a but solid bolting device and netted anchor supporting structure of slip casting, this application includes support frame and solid stock and supplementary slip casting hole sealing device, the support frame includes circular supporting bottom plate, supporting bottom plate outside evenly connected several in-connection arm, the in-connection arm other end passes through hinged joint device and is connected with the pressure-bearing backing plate, be equipped with the outer joint arm between per two adjacent pressure-bearing backing plates, the middle part of every outer joint arm is equipped with the connection buckle, link together every support frame and constitute netted supporting structure. The anchor rod holes are formed in the middle of the pressure bearing base plate and the middle of the supporting base plate, the steel sleeve is fixed in the anchor rod holes, the solid anchor rod body is fixed in the steel sleeve, three spiral ends are arranged at the front portion of the solid anchor rod body, a plurality of rivets are arranged inside the spiral ends of the rod body, and the tail end of the solid anchor rod body is connected with the auxiliary grouting hole sealing device. The application can effectively improve the stability and reliability of support, but in practice, the application still has a great promotion space for a complex and severe geological environment.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the problem of poor application performance of the conventional anchor bolt support in the prior art, and provides an assembled type densely-distributed hole-branched multipurpose hollow grouting anchor bolt and a construction method thereof, wherein the grouting anchor bolt is specially designed in structure, so that the grouting consolidation range of the grouting anchor bolt can be effectively increased, a variable-section grouting consolidation support section is formed, the friction effect between the grouting anchor bolt and a support body is fully exerted, and the support and anti-floating effects of the grouting anchor bolt are improved; the construction method using the assembled grouting anchor rod is fast and efficient, and is more beneficial to improving the construction progress and ensuring the construction quality of the project.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the invention discloses an assembled multi-purpose hollow grouting anchor rod with densely distributed holes and bifurcations, which comprises an anchor rod body, wherein the outer wall of the anchor rod body is provided with a plurality of rod body grouting holes communicated with an inner cavity, a plurality of groups of sleeves are arranged along the height direction of the anchor rod body at intervals in a matched manner, a plurality of groups of telescopic rods are uniformly arranged at intervals along the circumferential direction outside each group of sleeves, and the wall surface of each telescopic rod is also provided with a grouting hole communicated with the inner cavity of the anchor rod body.

Furthermore, the sealing device is used for sealing the grouting hole and the opening at the tail end of the telescopic rod, so that the whole anchor rod body is kept airtight.

Furthermore, a plurality of groups of external lugs are uniformly arranged on the outer wall of the anchor rod body at intervals along the circumferential direction, a lug through hole penetrating to the inner cavity of the anchor rod body is formed in each external lug, and a sleeve inserting hole is formed in each external lug in a manner of extending from one end in the height direction along the height direction; correspondingly, the sleeve pipe includes the pipe shaft, sets up the first perforation that runs through to the inner chamber on the pipe shaft outer wall, and the tip of pipe shaft inner chamber is equipped with the flexible plug-in components of inside extension, and the second perforation has been seted up to corresponding the position on the flexible plug-in components, and when the sleeve pipe cover was located on the stock body of rod outer wall, the flexible plug-in components corresponded the cooperation and imbedded the sleeve pipe jack in, the telescopic link then corresponds and passes first perforation, the second is perforated, the perforation fixed mounting of ox ear.

Furthermore, the end part of the flexible plug-in is connected with the inner wall of the pipe body through a limiting connecting plate, and sealing rubber is arranged on the surface of the flexible plug-in, the surface of the limiting connecting plate and the inner wall surface of the pipe body at the corresponding position.

Furthermore, the telescopic rod comprises a first connecting sleeve and at least one stage of matched telescopic sleeve, the first connecting sleeve comprises a first pipe body, a plurality of groups of first in-pipe sliding grooves are formed in the inner wall of the first pipe body along the length extending direction, each group of first in-pipe sliding grooves are formed by gaps between first in-pipe limiting plates on two sides, a first limiting ring extending towards the inner cavity is further arranged at the tail end of the first pipe body, and the extending width of the first limiting ring in the inner direction is greater than that of the first in-pipe limiting plates; the matched telescopic sleeve is arranged in the first pipe body, a plurality of groups of arc-shaped sliding blocks which are matched with the sliding grooves in the first pipe body to slide are correspondingly arranged on the outer wall of the matched telescopic sleeve, and a plurality of grouting holes which penetrate through the outer wall of the matched telescopic sleeve and are communicated with the inner cavity are formed in the outer wall of the matched telescopic sleeve; the multistage matching telescopic sleeves are arranged in a nested manner layer by adopting the same sliding block and sliding groove matching structure, so that a multistage telescopic structure is formed.

Furthermore, the tail end part of the last-stage matched telescopic sleeve is sealed by a plugging head, the plugging head comprises a plugging pipe body which is embedded in the inner cavity of the matched telescopic sleeve, a plugging hanging lug is arranged on the periphery of the plugging pipe body, and a limiting ring opening matched with the plugging hanging lug is correspondingly arranged on a limiting ring matched with the tail end of the matched telescopic sleeve; the plugging pipe body is internally provided with a plugging grouting hole communicated with the inner cavity of the matched telescopic sleeve, and the plugging grouting hole is sealed by plugging sealing rubber.

Furthermore, the front end part of the anchor rod body is provided with a rod end internal thread which is used for being matched and connected with the grouting pipe; the outer wall of the front end of the first pipe body of the first connecting sleeve is provided with first pipe body threads, and the inner wall of the hole body, corresponding to the cow ear perforation, of the wall surface of the anchor rod body and used for installing the telescopic rod is correspondingly provided with hole inner threads matched with the first pipe body threads.

Furthermore, the first in-pipe limiting plate in the first pipe body is an L-shaped limiting plate, two groups of L-shaped limiting plates are distributed oppositely to form a first in-pipe chute, a connecting piece and an arc-shaped sliding block positioned at the end part of the connecting piece are correspondingly arranged on the outer wall of the matched telescopic sleeve, and the arc-shaped sliding block is correspondingly embedded into the first in-pipe chute to be in sliding fit and is limited by a first limiting ring; the limiting plates matched with the inner wall of the telescopic sleeve adopt the same structure.

The construction method of the assembled multi-purpose hollow grouting anchor rod with densely distributed holes and bifurcations comprises the steps of firstly positioning a grouting soil body and the position of an anchor rod drilling hole on a supporting slope surface of the grouting soil body, starting a drilling machine to drill holes and expand holes, forming different expanded hole sections according to actual requirements, and cleaning the holes; then, the grouting anchor rod is assembled and the air tightness and the flexibility are checked; the grouting anchor rod is installed in the anchor rod drilling hole and connected with the grouting pump truck through the grouting pipe, different air pressures are applied, the telescopic rod correspondingly extends, the sealing element blocked in the grouting hole is finally extruded, a smooth grouting channel is formed, grouting is started, and a grouting consolidation section is finally formed.

Further, the construction method of the invention specifically comprises the following processes:

s1, measuring and setting out, determining the position of an anchor rod drilling hole on a support slope surface, and completing preparation work before drilling of the anchor rod drilling hole;

s2, starting a drilling machine, drilling according to the drilling inclination angle, then using a reaming drill rod, and mechanically reaming at the corresponding reaming position to form different reaming areas; cleaning sludge in the anchor rod drill hole;

s3, completing the integral assembly of the grouting anchor rod and checking air tightness and flexibility;

s4, installing a grouting anchor rod according to a designed position, sequentially installing a grout stop plug, a steel base plate and a nut, connecting the grouting anchor rod with a grouting pump truck through a grouting pipe, applying different air pressures according to the thrust required by telescopic rods, so that the telescopic rods corresponding to different positions respectively extend and expand in corresponding reaming areas, and finally increasing the air pressure once to extrude sealing elements plugged on the grouting anchor rod and the telescopic rods to form a bifurcated grouting channel;

and S5, injecting grouting slurry into the grouting anchor rod by using a grouting pump truck, wherein the grouting slurry sequentially flows out of a grouting hole of the grouting anchor rod and is diffused in a soil body under the action of air pressure to form a grouting consolidation section, constant pressure is kept for continuous grouting until the diffusion pressure of the grouting slurry in the soil body meets the requirement, the plugging of a grouting opening of the grouting anchor rod is completed, and the maintenance is carried out until the standard is reached.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) According to the assembled multi-purpose hollow grouting anchor rod with densely distributed holes and branches, the design of the telescopic rod can form the branch-type rod bodies with different lengths, different reinforcing sections and grouting reinforcing areas can be formed in a soil body, the telescopic rod and grouting slurry are effectively bonded together, and the anti-floating effect of the anchor rod is greatly improved.

(2) The assembly type multi-purpose hollow grouting anchor rod with the densely distributed holes and the branches has the advantages that the overall structure adopts an assembly type assembly mode, so that the assembly speed of the anchor rod is increased, and the construction progress is accelerated; the material is saved on the whole, the stepped engaging force of the soil body in the reinforced area is fully exerted, and the anti-floating effect is improved.

Drawings

Fig. 1 is a structural schematic diagram of an application state of a grouting anchor rod of the invention;

FIG. 2 is a schematic view of different reaming sections in the supporting soil body of the invention;

FIG. 3 is a schematic view of a quincunx arrangement of anchor rods on a support surface in the present invention;

fig. 4 is a schematic structural view of the main body of the grouting anchor rod of the invention;

fig. 5 is a cross-sectional view of the anchor rod body of the present invention;

fig. 6 is a plan view of the cross-sectional construction of the anchor rod body of the present invention;

FIG. 7 is a cross-sectional view of the sleeve of the present invention;

FIG. 8 is a schematic plan view of a cross-sectional structure of the bushing of the present invention;

fig. 9 is a top view of the anchor rod body of the present invention after connection with the sleeve;

FIG. 10 is a schematic view of the working state of the three-stage telescopic rod according to the present invention;

FIG. 11 is a schematic view of a first stage of the present invention in a telescopic configuration;

FIG. 12 is a schematic view of a first coupling sleeve configuration of the present invention;

FIG. 13 is a plan view of a cross-sectional configuration of a first coupling sleeve of the present invention;

FIG. 14 is a cross-sectional view of the first coupling sleeve of the present invention;

FIG. 15 is a schematic end view of the first joint sleeve of the present invention;

FIG. 16 is a schematic view of a second connection sleeve configuration of the present invention;

FIG. 17 is a schematic plan view of a cross-sectional configuration of a second joint sleeve of the present invention;

FIG. 18 is a side elevational view of a second connecting sleeve end of the invention;

FIG. 19 is a schematic view of a first plug structure according to the present invention;

FIG. 20 is a schematic top view of a first blocking head of the present invention;

FIG. 21 is a structural diagram illustrating a second stage of the present invention;

FIG. 22 is a schematic view of a third connection sleeve configuration of the present invention;

FIG. 23 is a schematic plan view of a cross-sectional configuration of a third joint sleeve of the present invention;

FIG. 24 is a side elevational schematic view of a third nipple end portion of the present invention;

FIG. 25 is a schematic view of a second plug structure according to the present invention;

FIG. 26 is a top view of the second blocking head of the present invention;

FIG. 27 is a structural view illustrating a third stage of the present invention;

FIG. 28 is a schematic view of a fourth connection sleeve configuration of the present invention;

FIG. 29 is a schematic plan view of a cross-sectional configuration of a fourth adapter sleeve according to the present invention;

FIG. 30 is a side elevational schematic view of a fourth nipple end of the present invention;

FIG. 31 is a schematic structural view of a third plugging head of the present invention;

FIG. 32 is a top view of the third plug of the present invention.

The reference numerals in the schematic drawings illustrate:

1. grouting soil; 2. grouting an anchor rod; 3. a telescopic rod; 4. stopping a slurry plug; 5. a steel backing plate; 6. a nut; 7. grouting pump truck; 8. a grouting pipe; 9. grouting and solidifying section;

11. a horizontal ground; 12. supporting the slope; 13. drilling a hole in the anchor rod; 14. a first expanded hole region; 15. a second expanded hole region; 16. a third expanded hole region; 17. drilling inclination angle;

21. an anchor rod body; 22. internal threads at the rod end; 23. a shaft body grouting hole; 24. a shaft body connecting hole; 25. a sleeve;

31. a first connection sleeve; 32. a second connecting sleeve; 33. a third connecting sleeve; 34. a fourth connecting sleeve; 35. a first stopper head; 36. a second plugging head; 37. a third plugging head;

211. externally hanging cattle ears; 212. perforating the oxear; 213. a sleeve insertion hole; 241. a hole body; 242. threading in the hole;

251. a tube body; 252. a first through hole; 253. a flexible insert; 254. a second perforation; 255. sealing rubber; 256. a limiting connecting plate;

311. a first pipe body; 312. a first tube thread; 313. a first in-tube chute; 314. a first in-pipe limiting plate; 315. a first limit ring;

321. a second tube; 322. a second connecting member; 323. a second outer arc-shaped slider; 324. a second in-tube chute; 325. a second in-pipe limiting plate; 326. a second stop collar; 327. a second pipe body grouting hole; 328. a second plugging rubber; 329. a second limit ring opening;

351. a first plugging pipe body; 352. a first plugging hanging lug; 353. a first plugging grouting hole; 354. a first plugging sealing rubber;

331. a third tube; 332. a third connecting member; 333. a third outer arcuate slider; 334. a third in-pipe chute; 335. a third in-pipe limiting plate; 336. a third limit ring; 337. a third pipe body grouting hole; 338. third plugging rubber; 339. a third limiting ring opening;

361. a second plugging pipe body; 362. a second plugging hanging lug; 363. a second plugging grouting hole; 364. a second plugging sealing rubber;

341. a fourth tube; 342. a fourth connecting member; 343. a fourth outer arc slider; 344. a fourth in-tube chute; 345. a fourth in-tube limiting plate; 346. a fourth limit ring; 347. a fourth tube grouting hole; 348. fourth plugging rubber; 349. a fourth limiting ring opening;

371. a third plugging pipe body; 372. a third plugging hanging lug; 373. a third plugging grouting hole; 374. and a third sealing rubber.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present invention will be further described with reference to the following examples.

Example 1

As shown in fig. 1-32, specifically in fig. 1, 2 and 3, the grouting soil 1 in this embodiment is a grouting soil 1, the upper surface of the grouting soil 1 is a horizontal ground 11, the lateral surface of the grouting soil 1 has a support slope 12, and an anchor rod drilling hole 13 for placing a grouting anchor rod 2 is formed in the support slope 12; the method comprises the steps of defining an included angle between an anchor rod drilling hole 13 and a horizontal ground 11 as a drilling inclination angle 17 by taking the horizontal ground 11 as a reference surface, and completing reaming work of a first reaming region 14, a second reaming region 15 and a third reaming region 16 in sequence from an inlet position of the anchor rod drilling hole 13 to the inside of the hole after the anchor rod drilling hole 13 reaches a preset drilling depth, wherein the first reaming region 14, the second reaming region 15 and the third reaming region 16 are cylindrical holes, the reaming heights are the same, the reaming radiuses are different, the reaming radiuses are increased from the outside to the inside in sequence, the radius of the first reaming region 14 is the smallest, and the radius of the third reaming region 16 is the largest. The first expanded hole region 14, the second expanded hole region 15 and the third expanded hole region 16 correspond to the telescopic rods 3 on the grouting anchor rod 2 respectively, that is, the telescopic rods 3 with different extension lengths correspond to each other.

As shown in fig. 4, the multi-purpose hollow grouting anchor rod with the fabricated densely-distributed holes and the bifurcated holes of the embodiment comprises an anchor rod body 21, wherein the outer wall of the anchor rod body 21 is provided with a plurality of groups of rod body grouting holes 23 communicated with the inner cavity, and along the height direction of the anchor rod body 21, a plurality of groups of sleeves 25 are arranged in a spaced fit manner, the outer side of each group of sleeves 25 is provided with a plurality of groups of telescopic rods 3 at uniform intervals along the circumferential direction, and the wall surface of each telescopic rod 3 is also provided with a plurality of groups of grouting holes communicated with the inner cavity of the anchor rod body 21. And secondly, the sealing device is used for sealing the grouting hole and the opening at the tail end of the telescopic rod 3, and particularly adopts sealing rubber and the like to ensure that the whole anchor rod body 21 keeps air tightness. The slip casting entrance point of the stock body of rod 21 is equipped with the internal thread of rod end 22 for be connected with slip casting pipe 8, and pole body slip casting hole 23 and pole body connecting hole 24 distribute on the stock body of rod 21, and the sleeve pipe 25 fits promptly and installs in the outside of pole body connecting hole 24, and pole body slip casting hole 23 hoop evenly, vertically equidistant locates on the stock body of rod 21 and runs through to the inner chamber, and pole body connecting hole 24 and pole body slip casting hole 23 staggered arrangement in the vertical direction.

As shown in fig. 5 and 6, a plurality of groups of externally-hanging ears 211 are uniformly arranged on the outer wall of the anchor rod body 21 at intervals along the circumferential direction, specifically, the externally-hanging ears 211 are arc-shaped ears attached to the outer wall of the anchor rod body 21, the externally-hanging ears 211 are provided with ear through holes 212 penetrating to the inner cavity of the anchor rod body 21, the hole locations of the ear through holes 212 are in one-to-one correspondence and consistent size with those of the rod body connecting holes 24, and the externally-hanging ears 211 are provided with sleeve insertion holes 213 extending from one end of the height direction along the height direction; specifically, the sleeve insertion hole 213 is gradually inclined from top to bottom in the height direction in the direction away from the outer wall of the anchor rod body 21, i.e., the inner wall surface of the external tab 211 becomes gradually thinner from top to bottom. The maximum wall thickness of the externally-hung bracket 211 is slightly smaller than the distance between the outer wall surface of the anchor rod body 21 and the inner wall surface of the sleeve 25, so that the sleeve 25 can be conveniently installed in a matching way. The cattle ear perforation 212 is arranged at the center of the outer wall of the external cattle ear 211 and penetrates through the thickness of the cattle ear, the sleeve insertion hole 213 is arranged between the outer wall of the external cattle ear 211 and the anchor rod body 21, and the sleeve insertion hole 213 is an arc-shaped hole matched with the outer wall of the anchor rod body 21, as shown in fig. 6, the sleeve insertion hole 213 is arranged from bottom to top, and the top end of the sleeve insertion hole is arranged at the middle position of the wall thickness of the anchor rod body 21.

Correspondingly, as shown in fig. 7, 8 and 9, the casing 25 includes a casing 251, a first through hole 252 penetrating through the inner cavity is formed in an outer wall of the casing 251, an inwardly extending flexible plug 253 is disposed at an end portion of the inner cavity of the casing 251, a second through hole 254 is formed in a corresponding position of the flexible plug 253, when the casing 25 is sleeved on the outer wall of the anchor rod body 21, the flexible plug 253 is correspondingly inserted into the casing insertion hole 213 in a matching manner, and the telescopic rod 3 is correspondingly fixed and installed through the first through hole 252, the second through hole 254 and the cow ear through hole 212. The end of the flexible plug-in 253 is connected with the inner wall of the pipe body 251 through a limiting connecting plate 256, and sealing rubber 255 is arranged on the surface of the flexible plug-in 253, the surface of the limiting connecting plate 256 and the inner wall surface of the pipe body 251 at the corresponding position. As shown in fig. 7, that is, the bottom of the inner wall of the tube body 251 is uniformly provided with a limiting connection plate 256 along the circumferential direction, the end of the limiting connection plate 256 is provided with a flexible plug-in 253, the structure, size, shape and extending inclination angle of the flexible plug-in 253 are all corresponding to and consistent with the sleeve insertion hole 213, when the flexible plug-in 253 is inserted into the sleeve insertion hole 213, the limiting connection plate 256 just abuts against the lower bottom end of the external lug 211 to perform limiting and fixing functions; the sealing rubber 255 is arranged to ensure the sealing performance of the connecting part of the sleeve 25 and the anchor rod body 21.

The telescopic rod 3 of this embodiment includes a first connection sleeve 31 and at least one stage of matching telescopic sleeve, the first connection sleeve 31 includes a first tube body 311, a plurality of groups of first in-tube sliding grooves 313 are arranged in the inner wall of the first tube body 311 along the length extending direction, each group of first in-tube sliding grooves 313 is formed by the gap between the first in-tube limiting plates 314 at the two sides, the tail end of the first tube body 311 is further provided with a first limiting ring 315 extending towards the inner cavity, and the inward extending width of the first limiting ring 315 is greater than the extending width of the first in-tube limiting plates 314; the matched telescopic sleeve is arranged in the first pipe body 311, a plurality of groups of arc-shaped sliding blocks which are matched with the sliding grooves 313 in the first pipe body to slide are correspondingly arranged on the outer wall of the matched telescopic sleeve, and a plurality of grouting holes which penetrate through the outer wall of the matched telescopic sleeve and are communicated with the inner cavity are formed in the outer wall of the matched telescopic sleeve; the multistage matching telescopic sleeves are arranged in a nested manner layer by adopting the same sliding block and sliding groove matching structure, so that a multistage telescopic structure is formed. The outer wall of the matched telescopic sleeve is correspondingly provided with a connecting piece and an arc-shaped sliding block positioned at the end part of the connecting piece, and the arc-shaped sliding block is correspondingly embedded into the first in-pipe sliding groove 313 to be in sliding fit and is limited by a first limiting ring 315; the limiting plates matched with the inner wall of the telescopic sleeve adopt the same structure.

Furthermore, the tail end part of the last stage of each telescopic level matched with the telescopic sleeve is sealed through a plugging head, the plugging head comprises a plugging pipe body which is embedded in the inner cavity of the matched telescopic sleeve, a plugging hanging lug is arranged on the periphery of the plugging pipe body, and a limiting ring opening matched with the plugging hanging lug is correspondingly arranged on a limiting ring matched with the tail end of the telescopic sleeve; the plugging pipe body is internally provided with a plugging grouting hole communicated with the inner cavity of the matched telescopic sleeve, and the plugging grouting hole is sealed by plugging sealing rubber.

In the specific embodiment, three stages of matched telescopic pipes are commonly provided, that is, the telescopic rod 3 includes a first connecting pipe 31, a second connecting pipe 32, a third connecting pipe 33 and a fourth connecting pipe 34, and is divided into three telescopic levels, which are determined according to corresponding use requirements, for example, in fig. 2, the telescopic rod 3 telescopic levels at different positions are determined according to the positions of the corresponding first expanded hole region 14, the second expanded hole region 15 and the third expanded hole region 16, and correspondingly, the end portions of the last matched telescopic pipes at different telescopic levels are respectively plugged by a first plugging head 35, a second plugging head 36 and a third plugging head 37.

The specific assembly at three levels of telescoping is as follows:

when the first stage stretches out and draws back: the first connecting sleeve 31 is used as a main connecting rod, the second connecting sleeve 32 is inserted from the end of the first connecting sleeve 31, and the first plugging head 35 is inserted from the end of the second connecting sleeve 32 and is arranged at the tail end of the second connecting sleeve 32;

when the second stage is telescopic: on the basis of the first-stage expansion, the first plugging head 35 is not installed, the third connecting sleeve 33 is inserted from the end of the second connecting sleeve 32, the second plugging head 36 is inserted from the end of the third connecting sleeve 33 and is installed at the tail end of the third connecting sleeve 33;

when the third stage is telescopic: on the basis of the second-stage expansion, the second plugging head 36 is not installed, the fourth connecting sleeve 34 is inserted from the end of the third connecting sleeve 33, and the third plugging head 37 is inserted from the end of the fourth connecting sleeve 34 and installed at the tail end of the fourth connecting sleeve 34.

As shown in fig. 11 to 15, the first connecting sleeve 31 includes a first tube 311, a first tube thread 312 is disposed on an outer wall of a head end of the first tube 311, and an inner wall of a hole 241 for installing the telescopic rod 3, which corresponds to the bullear perforation 212, on a wall surface of the anchor rod body 21 is correspondingly provided with a hole thread 242 engaged with the first tube thread 312. After the first connecting sleeve 31 passes through the first through hole 252, the tauear through hole 212 and the second through hole 254, the shaft connecting hole 24 is inserted, and the first connecting sleeve 31 is rotated to complete the connection and fixation of the first body threads 312 and the hole internal threads 242. The first inner limiting plate 314 of the first tube 311 is an L-shaped limiting plate, two groups of L-shaped limiting plates are distributed oppositely to form a first inner chute 313, the first limiting ring 315 is located at the tail end of the first tube 311 and has a certain thickness, and the width of the first limiting ring 315 is slightly larger than the distance between the outer end of the first inner limiting plate 314 and the inner wall of the first tube 311.

As shown in fig. 16 to 18, the second connection sleeve 32 includes a second tubular body 321, and a second sliding groove 324 in the second tubular body 321, a second limiting plate 325 in the second tubular body, and a second limiting ring 326 are arranged in the second tubular body, and the arrangement of the second limiting ring 326 is consistent with the arrangement of the first connection sleeve 31; the second outer arc-shaped sliding block 323 is positioned on the outer wall of the head end of the second pipe body 321, is connected with the second pipe body 321 through a second connecting piece 322, and is circumferentially and uniformly distributed on the outer wall of the second pipe body 321; when the second connecting sleeve 32 is inserted into the first connecting sleeve 31, the second outer arc-shaped sliding block 323 is inserted into and slides from the first inner sliding groove 313; the second limit ring 326 is provided with a second limit ring opening 329, and the second limit ring opening 329 is cut into the second limit ring 326 to a certain thickness; the second tube grouting holes 327 are circumferentially and uniformly distributed on the second tube 321 and penetrate to the inner cavity, and the second plugging rubber 328 is plugged and installed in the second tube grouting holes 327.

As shown in fig. 21 to 24, the third connecting sleeve 33 includes a third tubular body 331, and similarly, a third connecting member 332 and a third outer arc-shaped slider 333 are circumferentially disposed on the outer wall surface of the head end; the inner wall is correspondingly provided with a third in-pipe chute 334, a third in-pipe limiting plate 335 and a third limiting ring 336; the third limiting ring 336 is provided with a third limiting ring opening 339, and the third tube body 331 is provided with a third tube body grouting hole 337 and a third plugging rubber 338, which are arranged in the same manner as the second connection sleeve 32, and are not described herein again.

As shown in fig. 27-30, the fourth connection sleeve 34 includes a fourth tube 341, and the fourth tube 341 is provided with a fourth connector 342, a fourth outer arc-shaped slider 343, a fourth tube inner sliding groove 344, a fourth tube inner limiting plate 345, a fourth limiting ring 346, a fourth tube grouting hole 347, a fourth plugging rubber 348, and a fourth limiting ring opening 349, and the arrangement form of the fourth connection sleeve is the same as that of the second connection sleeve 32, which is not described again.

As shown in fig. 19 and 2, the first plugging head 35 includes a first plugging tube 351, the first plugging tube 351 is cylindrical, a first plugging grouting hole 353 penetrates through the middle of the first plugging tube 351, and the outer diameter of the first plugging tube 351 is equal to the inner diameter of the second connection sleeve 32; the first plugging hanging lugs 352 are circumferentially and uniformly distributed at the head end of the first plugging pipe body 351, the size of the first plugging hanging lugs is consistent with the size of the second limiting ring opening 329, and the first plugging sealing rubber 354 is installed in the first plugging grouting hole 353.

Similarly, as shown in fig. 25 and 26, the second blocking head 36 includes a second blocking tube 361, and the second blocking tube 361 is provided with a second blocking lug 362, a second blocking grouting hole 363 and a second blocking sealing rubber 364; the arrangement form is the same as that of the first blocking head 35, and the description is omitted here. As shown in fig. 31 and 32, the third plugging head 37 includes a third plugging tube 371, and the third plugging tube 371 is provided with a third plugging hanging lug 372, a third plugging grouting hole 373, and a third plugging sealing rubber 374, and the arrangement form of the third plugging hanging lug, the third plugging grouting hole 373, and the third plugging sealing rubber 374 is the same as that of the first plugging head 35, and will not be described herein again.

The construction method of the assembled multi-purpose hollow grouting anchor rod with densely distributed holes and bifurcations in the embodiment comprises the steps of firstly positioning a grouting soil body 1 and the position of an anchor rod drilling hole 13 in a supporting slope surface 12, starting a drilling machine to drill holes and expand holes, forming different expanded hole sections according to actual requirements, and cleaning the holes; then, the grouting anchor rod 2 is assembled and the air tightness and the flexibility are checked; installing slip casting stock 2 in stock drilling hole 13 and linking to each other with slip casting pump truck 7 through slip casting pipe 8, applying different atmospheric pressure for telescopic link 3 corresponds the extension, and finally extrude the sealing member of shutoff in the slip casting hole, forms unobstructed slip casting passageway, begins the slip casting, finally forms slip casting consolidation section 9.

Further, the method specifically comprises the following processes:

s1, measuring and setting out, determining the position of an anchor rod drilling hole 13 on a support slope surface 12, moving a drilling rig, adjusting the drill rod inclination angle of the drilling rig, ensuring that the drill rod inclination angle is consistent with a drilling inclination angle 17, and completing preparation before drilling of the anchor rod drilling hole 13;

s2, starting a drilling machine, drilling according to the drilling inclination angle 17 to reach the designed drilling depth of the anchor rod drilling hole 13, then using a reaming drill rod, and performing mechanical reaming at the corresponding reaming position to form different reaming areas, such as a first reaming area 14, a second reaming area 15 and a third reaming area 16; checking whether the reaming parameters meet the design requirements or not, repairing the reaming parameters which do not meet the requirements, and re-drilling and reaming after the grouting cement which cannot be repaired is solidified; according to the requirements, sludge is cleaned in a pumping mode in the anchor rod drilling hole 13;

s3, completing the integral assembly of the grouting anchor rod 2 and checking air tightness and flexibility;

firstly, the assembly of the telescopic rod 3 is completed, the first-stage expansion formed by the first connecting sleeve 31, the second connecting sleeve 32 and the first plugging head 35 is respectively checked, the second-stage expansion formed by the first connecting sleeve 31, the second connecting sleeve 32, the third connecting sleeve 33 and the second plugging head 36 is respectively checked, the third-stage expansion formed by the first connecting sleeve 31, the second connecting sleeve 32, the third connecting sleeve 33, the fourth connecting sleeve 34 and the third plugging head 37 is checked, the air tightness and the expansion of the third-stage expansion are checked, and the telescopic rod is correspondingly replaced if the requirements are not met; then the connection of the sleeve 25 and the anchor rod body 21 and the connection of the telescopic rod 3 and the anchor rod body 21 are completed, the porous integral assembly of the forked rod wall of the whole grouting anchor rod 2 is completed, and finally the check and confirmation of the integral air tightness are carried out.

S4, installing a grouting anchor rod 2 according to a designed position, sequentially installing a grout stop plug 4, a steel backing plate 5 and a nut 6, connecting the grouting anchor rod 2 with a grouting pump truck 7 through a grouting pipe 8, applying different air pressures according to the thrust required by telescopic rods 3, so that the telescopic rods 3 corresponding to different positions respectively extend and expand in corresponding reaming areas, and finally increasing the air pressure once to extrude sealing parts plugged on the grouting anchor rod 2 and the telescopic rods 3 to form a bifurcated grouting channel;

s5, injecting grouting slurry into the grouting anchor rod 2 by using a grouting pump truck 7, wherein the grouting slurry sequentially flows out of a grouting hole of the grouting anchor rod 2 and is diffused in a soil body under the action of air pressure to form a grouting consolidation section 9;

and (3) keeping constant pressure for continuous grouting, and when the flow of grouting liquid has no obvious change within a period of time, knowing that the diffusion pressure of the grouting liquid in the deep soil body reaches the extreme, completing plugging of a grouting opening of the grouting anchor rod 2, and applying load in a reinforced area when the grouting liquid is maintained to reach the standard. And then moving the machine tool, and repeating the steps to finish the rest installation and grouting work.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, without departing from the spirit of the present invention, a person of ordinary skill in the art should understand that the present invention shall not be limited to the embodiments and the similar structural modes without creative design.

Claims

1. The forked multipurpose cavity slip casting stock of assembled densely covered hole area, its characterized in that: the anchor rod comprises an anchor rod body (21), wherein a plurality of groups of rod body grouting holes (23) communicated with an inner cavity are formed in the outer wall of the anchor rod body (21), a plurality of groups of sleeves (25) are arranged along the height direction of the anchor rod body (21) at intervals in a matched mode, a plurality of groups of telescopic rods (3) are uniformly arranged on the outer side of each group of sleeves (25) at intervals along the circumferential direction, and grouting holes communicated with the inner cavity of the anchor rod body (21) are also formed in the wall surface of each telescopic rod (3); the sleeve (25) is detachably connected with the anchor rod body (21), and the telescopic rod (3) is detachably connected with the sleeve (25);

a plurality of groups of external lugs (211) are uniformly arranged on the outer wall of the anchor rod body (21) at intervals along the circumferential direction, lug through holes (212) which penetrate through the external lugs (211) and are communicated with the inner cavity of the anchor rod body (21) are formed in the external lugs, and sleeve inserting holes (213) are formed in the external lugs (211) in a manner of extending from one end in the height direction along the height direction; correspondingly, the sleeve (25) comprises a tube body (251), a first through hole (252) penetrating through the inner cavity is formed in the outer wall of the tube body (251), an inward extending flexible plug-in (253) is arranged at the end part of the inner cavity of the tube body (251), a second through hole (254) is formed in the corresponding position of the flexible plug-in (253), when the sleeve (25) is sleeved on the outer wall of the anchor rod body (21), the flexible plug-in (253) is correspondingly matched and embedded into the sleeve inserting hole (213), and the telescopic rod (3) correspondingly penetrates through the first through hole (252), the second through hole (254) and the cattle ear through hole (212) to be fixedly installed; the end part of the flexible plug-in (253) is connected with the inner wall of the pipe body (251) through a limiting connecting plate (256), and sealing rubber (255) is arranged on the surface of the flexible plug-in (253), the surface of the limiting connecting plate (256) and the inner wall surface of the pipe body (251) at the corresponding position; the telescopic rod (3) comprises a first connecting sleeve (31) and at least one stage of matched telescopic sleeve, the first connecting sleeve (31) comprises a first pipe body (311), a plurality of groups of first in-pipe sliding grooves (313) are formed in the inner wall of the first pipe body (311) along the length extending direction, each group of first in-pipe sliding grooves (313) are formed by gaps between first in-pipe limiting plates (314) on two sides, a first limiting ring (315) extending towards an inner cavity is further arranged at the tail end of the first pipe body (311), and the inward extending width of the first limiting ring (315) is greater than the extending width of the first in-pipe limiting plates (314); the matched telescopic sleeve is arranged in the first pipe body (311), a plurality of groups of arc-shaped sliding blocks which are matched with the sliding grooves (313) in the first pipe body to slide are correspondingly arranged on the outer wall of the matched telescopic sleeve, and a plurality of grouting holes which penetrate through the outer wall of the matched telescopic sleeve and are communicated with the inner cavity are formed in the outer wall of the matched telescopic sleeve; the multistage matching telescopic sleeves are arranged in a nested manner layer by adopting the same sliding block and sliding groove matching structure, so that a multistage telescopic structure is formed.

2. The fabricated densely-distributed hole-bifurcated multipurpose hollow grouting anchor rod as claimed in claim 1, wherein: the sealing device is used for sealing the grouting hole and the opening at the tail end of the telescopic rod (3), so that the whole anchor rod body (21) keeps air tightness.

3. The fabricated densely-distributed hole-bifurcated multipurpose hollow grouting anchor rod as claimed in claim 1, wherein: the tail end part of the last-stage matched telescopic sleeve is sealed through a plugging head, the plugging head comprises a plugging pipe body which is embedded in an inner cavity of the matched telescopic sleeve, plugging lugs are arranged on the periphery of the plugging pipe body, and a limiting ring opening matched with the plugging lugs is correspondingly arranged on a limiting ring matched with the tail end of the telescopic sleeve; the plugging pipe body is internally provided with a plugging grouting hole communicated with the inner cavity of the matched telescopic sleeve, and the plugging grouting hole is sealed by plugging sealing rubber.

4. The fabricated densely-distributed hole-bifurcated multipurpose hollow grouting anchor rod as claimed in claim 1, wherein: the front end part of the anchor rod body (21) is provided with a rod end internal thread (22) which is matched and connected with the grouting pipe (8); the outer wall of the front end of a first pipe body (311) of the first connecting sleeve (31) is provided with first pipe body threads (312), and the inner wall of a hole body (241) which corresponds to the ox ear perforation hole (212) and is used for installing the telescopic rod (3) on the wall surface of the anchor rod body (21) is correspondingly provided with hole inner threads (242) matched with the first pipe body threads (312).

5. The assembled densely packed hole-bifurcated multipurpose hollow grouted anchor rod as claimed in claim 1, wherein: the first in-pipe limiting plate (314) in the first pipe body (311) is an L-shaped limiting plate, two groups of L-shaped limiting plates are distributed oppositely to form a first in-pipe sliding groove (313), a connecting piece and an arc-shaped sliding block positioned at the end part of the connecting piece are correspondingly arranged on the outer wall of the matched telescopic pipe, and the arc-shaped sliding block is correspondingly embedded into the first in-pipe sliding groove (313) to be in sliding fit and is limited by a first limiting ring (315); the limiting plates matched with the inner wall of the telescopic sleeve adopt the same structure.

6. The construction method using the fabricated densely-distributed holed-bifurcated multipurpose hollow grouting anchor rod as claimed in any one of claims 1 to 5, wherein: firstly, positioning a grouting soil body (1) and the position of an anchor rod drilling hole (13) on a supporting slope surface (12), starting a drilling machine to drill holes and expand holes, forming different expanding hole sections according to actual requirements, and cleaning the holes; then the grouting anchor rod (2) is assembled and the air tightness and the flexibility are checked; install slip casting stock (2) in stock drilling (13) and link to each other with slip casting pump truck (7) through slip casting pipe (8), apply different atmospheric pressure for telescopic link (3) correspond the extension, and extrude the sealing member of shutoff in the slip casting hole finally, form unobstructed slip casting passageway, begin the slip casting, finally form slip casting consolidation section (9).

7. The construction method of the fabricated densely-distributed hole-bifurcated multipurpose hollow grouting anchor rod as claimed in claim 6, wherein: the method specifically comprises the following steps:

s1, measuring and setting out, determining the position of an anchor rod drilling hole (13) on a support slope surface (12), and completing preparation work before drilling of the anchor rod drilling hole (13);

s2, starting a drilling machine, drilling according to the drilling inclination angle (17), then using a reaming drill rod, and mechanically reaming at the corresponding reaming position to form different reaming areas; cleaning mud and slag in the anchor rod drill hole (13);

s3, completing the integral assembly of the grouting anchor rod (2) and checking air tightness and flexibility;

s4, installing a grouting anchor rod (2) according to a design position, sequentially installing a grout stop plug (4), a steel base plate (5) and a nut (6), connecting the grouting anchor rod (2) with a grouting pump truck (7) through a grouting pipe (8), applying different air pressures according to the thrust required by a telescopic rod (3), extending and expanding the telescopic rods (3) corresponding to different positions in corresponding reaming areas respectively, and increasing the air pressure for the last time to extrude sealing elements plugged on the grouting anchor rod (2) and the telescopic rod (3) to form a bifurcated grouting channel;

and S5, injecting grouting slurry into the grouting anchor rod (2) by using a grouting pump truck (7), wherein the grouting slurry sequentially flows out of a grouting hole of the grouting anchor rod (2) and is diffused in a soil body under the action of air pressure to form a grouting consolidation section (9), and constant-pressure continuous grouting is kept until the diffusion pressure of the grouting slurry in the soil body meets the requirement, so that the plugging of a grouting opening of the grouting anchor rod (2) is completed, and the grouting opening is maintained to reach the standard.