CN112554183A - Expandable anchoring device and method - Google Patents
Expandable anchoring device and method Download PDFInfo
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- CN112554183A CN112554183A CN202011457565.4A CN202011457565A CN112554183A CN 112554183 A CN112554183 A CN 112554183A CN 202011457565 A CN202011457565 A CN 202011457565A CN 112554183 A CN112554183 A CN 112554183A
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- anchoring
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- plug
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- 238000004873 anchoring Methods 0.000 title claims abstract description 210
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 19
- 238000001125 extrusion Methods 0.000 abstract description 10
- 238000007569 slipcasting Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 7
- 239000002689 soil Substances 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 239000011440 grout Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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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
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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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
- E21D21/0073—Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid
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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
- E21D21/008—Anchoring or tensioning means
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses an expandable anchoring device and a method, wherein the device comprises an anchor pipe and an expandable anchoring mechanism, the expandable anchoring mechanism comprises a connecting pipe, an expandable anchoring pipe and an anchoring plug, a dowel bar is arranged on the anchoring plug, and the anchor pipe, the expandable anchoring mechanism, the dowel bar and an anchor hole are coaxially arranged; the method comprises the following steps: firstly, assembling an expandable anchoring assembly outside the hole; secondly, drilling holes; thirdly, inserting an expandable anchoring assembly into the hole; fourthly, adjusting the expandable anchoring assembly in the hole; and fifthly, grouting. The expandable anchoring mechanism anchors the outer end of the anchor pipe, improves the anchoring force of the anchor pipe, can prevent a body to be anchored from generating large deformation, avoids potential safety hazards in construction, and improves the anchoring construction safety of the body to be anchored; through rotating the dowel bar, realize that the choke plug is to the extrusion of anchor enlarged tube, can form anchor enlarged head after follow-up slip casting, treat that the anchor body supports better, reduce and treat that the anchor body warp.
Description
Technical Field
The invention belongs to the technical field of anchoring and supporting construction, and particularly relates to an expandable anchoring device and method.
Background
In the protection construction process of underground engineering, mine roadways, railway tunnels and side slopes, due to crack development, the compressive strength is low, the stability of surrounding rocks after cavern excavation is poor, instability and damage are easy to occur, the stratum needs to be reinforced for preventing deformation, collapse and instability of the ground survey, and a main supporting technology for reinforcing the stratum adopts a foot-locking anchor pipe (rod). The stratum is reinforced through the high-strength tensile capacity of the anchor rod arranged in the stratum and through modes of dense combination and the like between the anchor rod and the grouting body around the anchor rod and the stratum, so that the integrity of the stratum is improved, and the stratum plays multiple mechanical effects of shearing resistance, tensile resistance, pressure resistance and the like, so that the deformation of the stratum is controlled, and the stratum is enabled to reach a stable and safe state. However, in the construction process, the stratum is often displaced greatly due to insufficient anchoring force of the lock pin anchor pipe (rod), so that the stratum is deformed greatly, and hidden danger is brought to construction safety. The prior art lacks of effectively improving the anchoring effect of the anchor pipe in tunnel construction, so that the expandable anchoring device and the expandable anchoring method are provided for effectively reinforcing the stratum.
Disclosure of Invention
The invention aims to solve the technical problem that the defects in the prior art are overcome, and the expandable anchoring device is provided, the outer end of an anchor pipe is anchored through the expandable anchoring mechanism, so that the anchoring force of the anchor pipe is improved, a body to be anchored can be prevented from being greatly deformed, the potential safety hazard in construction is avoided, and the anchoring construction safety of the body to be anchored is improved; through rotating the dowel bar, realize the end cap is right the extrusion of anchor enlarged tube can form anchor enlarged end after follow-up slip casting, and the body of treating the anchor better supports, reduces and treats anchor body deformation.
In order to solve the technical problems, the invention adopts the technical scheme that: an expandable anchoring device, characterized in that: the anchor device comprises an anchor pipe inserted into an anchor hole from inside to outside and an expandable anchor mechanism arranged at the outer end of the anchor pipe, wherein the expandable anchor mechanism comprises a connecting pipe arranged at the outer end of the anchor pipe, an anchor expanding pipe arranged at the outer end of the connecting pipe and an anchor plug inserted into the anchor expanding pipe and used for expanding the outer end of the anchor expanding pipe, a grouting channel communicated with the anchor pipe is arranged in the anchor plug, and a dowel bar which rotates from outside to inside along the depth direction of the anchor hole and pushes the anchor plug to move inwards is arranged on the anchor plug; the anchor pipe, the expandable anchoring mechanism, the dowel bar and the anchor hole are coaxially arranged.
The expandable anchoring device is characterized in that: the anchoring expansion pipe is formed by cutting a prefabricated steel pipe, the pipe diameter of the prefabricated steel pipe is gradually reduced from inside to outside, a plurality of cutting seams are formed in the pipe section of the anchoring expansion pipe, the plurality of cutting seams are uniformly distributed along the circumferential direction of the outer end of the anchoring expansion pipe, and the cutting seams are straight cutting seams from the outer side to the inner side of the prefabricated steel pipe.
The expandable anchoring device is characterized in that: the anchoring plug comprises a movable rod extending into the connecting pipe and a plug which is arranged at the outer end of the movable rod and is coaxially arranged with the movable rod; the movable rod is connected with the dowel bar in a plug-in manner; the plug is clamped at the outer end of the movable rod; the grouting channel comprises a communicating hole formed in the movable rod and a grouting through hole assembly formed on the plug, the communicating hole and the movable rod are coaxially arranged, and the communicating hole and the grouting through hole assembly are communicated with the anchor pipe.
The expandable anchoring device is characterized in that: the grouting through hole assembly comprises a longitudinal through hole arranged at the outer end of the plug and a plurality of annular through holes arranged on the plug; the longitudinal through hole is coaxially arranged with the plug, and is communicated with the communicating hole; and a plurality of annular through holes are uniformly distributed along the circumferential direction of the plug, and each annular through hole is communicated with the longitudinal through hole.
The invention also provides a method for anchoring the expandable anchoring device, which is characterized in that: the method comprises the following steps:
step one, assembling an expandable anchoring assembly outside a hole: welding the outer end of the connecting pipe and the inner end of the anchoring expansion pipe, and then welding the welded connecting pipe and the outer end of the anchor pipe; inserting a moving rod on the anchoring plug into the connecting pipe to be fixedly connected with the outer end of the connecting pipe, and assembling into an expandable anchoring assembly;
step two, drilling: drilling an anchor hole for installing the expandable anchoring device;
step three, inserting an expandable anchoring assembly in the hole: the assembled expandable anchoring assembly is driven into the anchor hole from inside to outside until the outer end of the plug is abutted against the bottom of the anchor hole;
step four, adjusting the expandable anchoring assembly in the hole: inserting a dowel bar into the anchor pipe, and inserting the outer end of the dowel bar on the movable rod; rotating the dowel bar to drive the anchoring plug to rotate towards the inner end of the anchor pipe; the end cap extrudes the anchoring expansion pipe in the rotating process, so that the end part of the anchoring expansion pipe is expanded until the end cap is clamped at the outer port of the connecting pipe, and the dowel bar stops rotating; then withdrawing the dowel bar from the anchor tube;
step five, grouting: and grouting from the inner end of the anchor pipe to the outer end of the anchor pipe, wherein the grouting liquid forms an anchoring and expanding end at the outer end of the plug through the grouting channel.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the anchoring expanded end is formed after grouting is completed by using the anchoring device, and the anchoring expanded end and the body to be anchored are connected into a whole through the anchor pipe to support the body to be anchored together, so that the deformation of the body to be anchored is reduced, and the overall stability of the body to be anchored is improved.
2. The expandable anchoring mechanism anchors the outer end of the anchor pipe, so that the anchoring force of the anchor pipe is improved, the body to be anchored can be prevented from being deformed greatly, potential safety hazards in construction are avoided, and the anchoring construction safety of the body to be anchored is improved.
3. The connecting pipe, the anchoring expansion pipe and the anchoring plug are combined, so that the outer end of the anchor pipe can be blocked, the anchoring expansion end can be formed during grouting, the anchoring force of the anchor pipe is enhanced, and the drawing resistance of the anchor pipe and the stability of a body to be anchored are improved.
4. The invention adopts the dowel bar to adjust the position of the anchoring plug, thereby facilitating the position adjustment of constructors in the anchor hole, and simultaneously withdrawing the anchoring plug from the anchor hole after the position adjustment of the anchoring plug is finished without influencing the subsequent grouting work.
5. According to the invention, the end cap is rotated to extrude the anchoring expansion pipe, so that the end part of the anchoring expansion pipe is expanded, an anchoring expansion end can be formed after subsequent grouting, the pulling resistance of the anchoring pipe is enhanced, a body to be anchored is better supported, and the deformation of the body to be anchored is reduced.
In conclusion, the expandable anchoring mechanism anchors the outer end of the anchor pipe, so that the anchoring force of the anchor pipe is improved, the body to be anchored can be prevented from being deformed greatly, the potential safety hazard in construction is avoided, and the anchoring construction safety of the body to be anchored is improved; through rotating the dowel bar, realize the end cap is right the extrusion of anchor enlarged tube can form anchor enlarged end after follow-up slip casting, and the body of treating the anchor better supports, reduces and treats anchor body deformation.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic assembly view of the structure of the present invention.
Fig. 2 is a schematic structural view of an expandable connecting assembly according to the present invention.
Fig. 3 is a schematic structural view of the anchoring plug of the present invention.
FIG. 4 is a schematic view showing the expanded anchoring pipe according to the present invention.
FIG. 5 is a schematic view of the construction state of the expandable anchor device of the present invention.
FIG. 6 is a schematic view of the construction state of the expandable anchoring device with hole adjustment according to the present invention.
Fig. 7 is a schematic view of the grouting construction state of the present invention.
FIG. 8 is a flow chart of the present invention.
Description of reference numerals:
1-a body to be anchored; 2-soil body; 3, an anchor pipe;
4, tunneling; 5, anchoring the connecting pipe; 6, anchoring the enlarged pipe;
6-1-cutting the seam; 7-moving the rod; 7-1-external thread;
7-2-mounting groove; 8-plug; 8-1-longitudinal through hole;
8-2-circumferential through hole; 9-dowel bar; 10-anchoring the enlarged end;
11-stop valve; 12-a communicating tube; 13-slip casting machine.
Detailed Description
As shown in fig. 1 to 7, the present invention includes an anchor pipe 3 inserted into an anchor hole from inside to outside, and an expandable anchoring mechanism disposed at an outer end of the anchor pipe 3, wherein the expandable anchoring mechanism includes a connecting pipe 5 disposed at an outer end of the anchor pipe 3, an anchoring expansion pipe 6 disposed at an outer end of the connecting pipe 5, and an anchoring plug inserted into the anchoring expansion pipe 6 for expanding an outer end of the anchoring expansion pipe 6, a grouting channel communicated with the anchor pipe 3 is disposed in the anchoring plug, and a force transmission rod 9 rotating from outside to inside in a depth direction of the anchor hole and pushing the anchoring plug to move inwards is disposed on the anchoring plug; the anchor pipe 3, the expandable anchoring mechanism, the dowel bar 9 and the anchor hole are all coaxially arranged.
In actual use, the expandable anchoring device is arranged on a body to be anchored 1 which needs to be reinforced, an anchoring and expanding end 10 is formed at the outer end of the expandable anchoring device through grouting, the anchoring and expanding end 10 is fused with a soil body 2, and a fixed head is formed at the outer end of the expandable anchoring device; when the body to be anchored 1 is greatly deformed in the traditional construction, the body to be anchored 1 can only play a role of supporting and anchoring through the anchor pipe 3, and by combining the anchoring expansion end 10 formed by grouting of the invention, when the body to be anchored 1 is greatly deformed, the stress generated by deformation acts on the anchor pipe 3 to drag the anchor pipe 3, and the anchoring expansion end 10 positioned at the outer end of the anchor pipe 3 can stabilize the dragging of the anchor pipe 3 to cause the displacement of the anchor pipe 3, so that the anchor pipe 3 is prevented from displacing when the body to be anchored 1 is greatly deformed; the anchoring force of the anchor pipe 3 is improved, potential safety hazards in construction are avoided, and the safety of anchoring construction of the body to be anchored 1 is improved.
The connecting pipe 5, the anchoring expansion pipe 6 and the anchoring plug are combined, the anchoring plug can rotate in the connecting pipe 5 under the driving of the dowel bar 9, the outer end of the anchoring expansion pipe 6 is opened along the opening direction of the cutting seam 6-1 due to the extrusion effect of the anchoring plug on the anchoring expansion pipe 6, then the outer end of the connecting pipe 5 is plugged through the plug 8, grouting liquid cannot flow back in the grouting process, the opened anchoring expansion pipe 6 and the plug 8 form an expansion type structure in the soil body 2, and finally the grouting liquid forms an anchoring expansion end 10 after grouting is completed, so that the anchoring force of the anchoring pipe 3 is enhanced, and the pulling resistance of the anchoring pipe 3 and the stability of the body to be anchored 1 are improved.
In addition, the main function of the dowel bar 9 is to adjust the position of the anchoring plug, drive the anchoring plug to move from outside to inside, and realize the extrusion effect of the plug 8 on the anchoring expansion pipe 6, when the expandable anchoring device is installed, the dowel bar 9 can be installed after the installation of the anchoring pipe 3 and the expandable anchoring mechanism is completed, and in order to ensure that the outer end of the dowel bar 9 is accurately installed in the installation groove 7-2, the dowel bar 9 needs to be coaxially arranged with the anchoring pipe 3; in order to facilitate subsequent grouting, after the position of the anchoring plug is adjusted, the dowel bar 9 can be detached without influencing subsequent grouting; and an anchoring expanded end 10 can be formed after subsequent grouting, so that the pulling resistance of the anchor pipe 3 is enhanced, the body to be anchored 1 is better supported, and the deformation of the body to be anchored 1 is reduced.
As shown in fig. 5 and 6, the outer end of anchor pipe 3 stretches into in the anchor hole, the inner of anchor pipe 3 is fixed on treating anchor body 1, forms anchor enlarged end 10 in anchor pipe 3's outer end after the slip casting is accomplished, anchor enlarged end 10 is connected as an organic wholely through anchor pipe 3 with treating anchor body 1, works as when treating that anchor body 1 takes place great deformation, because the stress that the deformation produced is used on anchor pipe 3, pulls anchor pipe 3, and anchor enlarged end 10 that is located anchor pipe 3 outer end can stabilize pulling that causes anchor pipe 3 displacement, treats anchor body 1 jointly and supports, reduces and treats anchor body 1 and warp, improves the overall stability of treating anchor body 1.
When the anchor pipe is in actual use, the inner end of the connecting pipe 5 and the outer end of the anchor pipe 3 are welded and fixed, the anchor expanding pipe 6 extends outwards from the cutting seam 6-1 through the extrusion of the plug 8 before grouting, and grouting liquid injected into the plug 8 through the anchor expanding pipe 6 can form an anchor expanding end 10 after solidification, so that the effect of strengthening anchoring is achieved. The anchoring plug is inserted into the anchoring expansion pipe 6 and then is rotatably connected with the connecting pipe 5, and the anchoring plug and the connecting pipe 5 can be rotatably connected through threaded connection. The inner end of the dowel bar 9 penetrates out of the anchor pipe 3 and extends into the body to be anchored 1, and the outer end of the dowel bar 9 is connected with the anchoring plug.
As shown in fig. 2, in this embodiment, the anchoring expansion pipe 6 is formed by cutting a prefabricated steel pipe, the pipe diameter of the prefabricated steel pipe is gradually reduced from inside to outside, a plurality of cutting seams 6-1 are formed on a pipe section of the anchoring expansion pipe 6, the plurality of cutting seams 6-1 are uniformly distributed along the circumferential direction of the outer end of the anchoring expansion pipe 6, and the cutting seams 6-1 are straight cuts from the outer side to the inner side of the prefabricated steel pipe.
During actual use, the outer diameter of the anchoring and expanding pipe 6 is gradually reduced from inside to outside to form a cutting end, so that the outer end of the anchoring and expanding pipe 6 can conveniently cut soil, and the resistance is reduced. The inner diameter of the inner end of the anchoring expansion pipe 6 is equal to the inner diameter of the connecting pipe 5, on one hand, subsequent grouting is facilitated, on the other hand, in the rotating process of the anchoring plug, the moving rod 7 of the anchoring plug can pass through the anchoring expansion pipe 6, and the anchoring plug is guaranteed to completely open the anchoring expansion pipe 6 in the extrusion process of the anchoring plug on the anchoring expansion pipe 6. The number of the cutting seams 6-1 is preferably eight, and the width of each cutting seam 6-1 is 1-2 mm; the length of the cutting seam 6-1 is equal to that of the anchoring expansion pipe 6; the purpose of the cutting seams 6-1 is to: in order to enable the anchoring plug head to rotate towards the direction close to the anchor pipe 3 under the driving of the dowel bar 9 before grouting, the anchoring expansion pipe 6 is expanded along the opening direction of the cutting seam 6-1 due to the extrusion of the plug head 8 in the moving process, due to the existence of the cutting seam 6-1, the anchoring expansion pipe 6 respectively extends outwards along the position of the cutting seam 6-1 after extrusion, and an anchoring expansion end 10 can be formed after grouting.
It should be noted that each cutting seam 6-1 is arranged along the axial direction of the anchoring expansion pipe 6, the outer end of the anchoring expansion pipe 6 is expanded under the extrusion of the plug 8, so that the outer end of the anchoring expansion pipe 6 is claw-shaped, and the diameter of the anchoring expansion end 10 formed after grouting by the grouting fluid is gradually increased from inside to outside by combining the plug 8; the shape enables the anchoring force of the anchoring expansion end 10 in the soil body 2 to be larger, and the anchoring body 1 to be anchored can be better anchored.
As shown in fig. 3, in this embodiment, the anchoring plug includes a movable rod 7 extending into the connecting tube 5, and a plug 8 disposed at an outer end of the movable rod 7 and coaxially arranged with the movable rod 7; the moving rod 7 is connected with the dowel bar 9 in a plug-in manner; the plug 8 is clamped at the outer end of the movable rod 7; the grouting channel comprises a communication hole formed in the movable rod 7 and a grouting through hole assembly formed in the plug 8, the communication hole and the movable rod 7 are coaxially arranged, and the communication hole and the grouting through hole assembly are communicated with the anchor pipe 3.
During the in-service use, the movable rod 7 and the end cap 8 are welded and fixed, the main effect of the movable rod 7 is to realize the rotation of the anchoring end cap under the driving of the dowel bar 9, the end cap 8 on one hand plays a role in plugging the connecting pipe 5 during grouting, on the other hand extrudes the anchoring expansion pipe 6 in the rotation process, and the expansion of the anchoring expansion pipe 6 is realized. An internal thread can be formed on the inner side surface of the connecting pipe 5, and an external thread matched with the internal thread is formed on the outer side surface of the moving rod 7, so that the anchoring plug and the connecting pipe 5 can be rotatably connected. An installation groove 7-2 matched with the outer end of the dowel bar 9 can be formed in the inner end face of the movable rod 7 to realize the plug-in connection between the movable rod 7 and the dowel bar 9; the depth of the mounting groove 7-2 is 1 cm-2 cm, and the mounting groove 7-2 is arranged for the following purposes: the dowel bar 9 is convenient to install, so that the anchoring plug can operate the anchoring plug when entering the anchoring hole. The communication hole is used for conveying grouting liquid into the plug 8, and the grouting liquid entering the communication hole is injected into the surrounding soil body 2 through the grouting through hole assembly. The outer diameter of the movable rod 7 is equal to the inner diameter of the outer end of the anchoring expansion pipe 6, so that when the anchoring plug rotates towards the direction close to the anchoring pipe 3, the movable rod 7 can freely pass through the anchoring expansion pipe 6 and rotate at the connecting pipe 5. The shape of end cap 8 is similar with the shape of microphone, the internal diameter of end cap 8 is not less than the internal diameter of connecting pipe 5, works as the anchor end cap to when anchor pipe 3's direction rotated, will anchor expansion pipe 6 struts gradually end cap 8 is close to the tip external diameter of carriage release lever 7 is not less than under the condition of connecting pipe 5's internal diameter, end cap 8 just can play the effect of shutoff, forms anchor expansion end 10 with the slip casting liquid together after slip casting finishes simultaneously.
In the embodiment, the grouting through hole assembly comprises a longitudinal through hole 8-1 arranged at the outer end of the plug 8 and a plurality of annular through holes 8-2 arranged on the plug 8; the longitudinal through hole 8-1 and the plug 8 are coaxially arranged, and the longitudinal through hole 8-1 is communicated with the communicating hole; a plurality of annular through holes 8-2 are uniformly distributed along the circumferential direction of the plugs 8, and each annular through hole 8-2 is communicated with the longitudinal through hole 8-1.
In actual use, the purpose of setting the grouting through hole assembly is as follows: the flowing and the diffusion of the grouting liquid are convenient in the grouting process; the longitudinal through hole 8-1 is communicated with the communicating hole, grouting liquid can enter the plug 8 from the communicating hole and then is discharged from the longitudinal through hole 8-1 and the annular through hole 8-2 communicated with the longitudinal through hole 8-1, and grouting is carried out on a soil body 2 to form an anchoring and expanding end 10. Preferably, the number of the circumferential through holes 8-2 is four, and the four circumferential through holes 8-2 are uniformly distributed along the circumferential direction of the plugs 8.
As shown in fig. 1-8, a method of anchoring an expandable anchoring device, the method comprising the steps of:
step one, assembling an expandable anchoring assembly outside a hole: welding the outer end of the connecting pipe 5 with the inner end of the anchoring expansion pipe 6, and then welding the welded connecting pipe 5 with the outer end of the anchor pipe 3; inserting a moving rod 7 on the anchoring plug into the connecting pipe 5 to be fixedly connected with the outer end of the connecting pipe 5, and assembling into an expandable anchoring assembly;
step two, drilling: drilling an anchor hole for installing the expandable anchoring device;
step three, inserting an expandable anchoring assembly in the hole: the assembled expandable anchoring assembly is driven into the anchor hole from inside to outside until the outer end of the plug 8 is abutted against the bottom of the anchor hole;
step four, adjusting the expandable anchoring assembly in the hole: inserting a dowel bar 9 into the anchor pipe 3, and inserting the outer end of the dowel bar 9 on the movable rod 7; rotating the dowel bar 9 to drive the anchoring plug to rotate towards the inner end of the anchor pipe 3; the plug 8 extrudes the anchoring expansion pipe 6 in the rotating process, so that the end part of the anchoring expansion pipe 6 is expanded until the plug 8 is clamped at the outer port of the connecting pipe 5, and the dowel bar 9 stops rotating; the dowel 9 is then withdrawn from the anchor tube 3;
step five, grouting: grouting from the inner end of the anchor pipe 3 to the outer end of the anchor pipe 3, and forming an anchoring expansion end 10 at the outer end of the plug 8 by grouting liquid through the grouting channel.
During actual use, the end cap 8 extrudes the anchoring expansion pipe 6 by rotating the dowel bar 9, so that the end part of the anchoring expansion pipe 6 is opened, an anchoring expansion end 10 can be formed after subsequent grouting, and the tunnel is reinforced. The dowel bar 9 is adopted to adjust the position of the anchoring plug, so that a constructor can conveniently complete the position adjustment of the expandable anchoring device in the anchor hole, and meanwhile, the anchor plug can be withdrawn from the anchor hole after the position adjustment is completed without influencing the subsequent grouting work. As shown in fig. 5, 6 and 7, a plurality of anchor pipes 3 are arranged on the cross section of the tunnel, and the anchoring expansion ends 10 formed at the end parts of the anchor pipes 3 are used for enhancing the pulling resistance of the anchor pipes 3, so as to better support the body 1 to be anchored and reduce the deformation of the body 1 to be anchored.
In the fourth step, due to the existence of the cutting seam 6-1, the anchoring expansion pipes 6 respectively extend outwards along the cutting seam 6-1 after being extruded, when the inner end of the plug 8 is clamped at the outer port of the connecting pipe 5, the end portions of the anchoring expansion pipes 6 are completely opened, and the anchoring expansion ends 10 can be formed after the subsequent grouting is completed. And in the fifth step, a grout stop valve 11 is arranged between the end part of the anchor pipe 3 and the grouting assembly. When the anchor pipe is actually used, grouting liquid entering the anchor pipe 3 is controlled through the grout stop valve 11, backflow of the grouting liquid is prevented, and the flow can be controlled. In the fifth embodiment, as shown in fig. 7, the grouting assembly includes a communicating pipe 12 installed at an end of the grout stop valve 11 far from the anchor pipe 3, and a grouting machine 13 disposed in the body to be anchored 1 and communicating with the communicating pipe 12 for grouting into the anchor pipe 3.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. An expandable anchoring device, characterized in that: the anchor device comprises an anchor pipe (3) inserted into an anchor hole from inside to outside and an expandable anchor mechanism arranged at the outer end of the anchor pipe (3), wherein the expandable anchor mechanism comprises a connecting pipe (5) arranged at the outer end of the anchor pipe (3), an anchoring expansion pipe (6) arranged at the outer end of the connecting pipe (5) and an anchoring plug inserted into the anchoring expansion pipe (6) and used for expanding the outer end of the anchoring expansion pipe (6), a grouting channel communicated with the anchor pipe (3) is formed in the anchoring plug, and a dowel bar (9) which rotates from outside to inside along the depth direction of the anchor hole and pushes the anchoring plug to move inwards is arranged on the anchoring plug; the anchor pipe (3), the expandable anchoring mechanism, the dowel bar (9) and the anchor hole are coaxially arranged.
2. An expandable anchoring device according to claim 1, wherein: the anchoring and expanding pipe (6) is formed by cutting a prefabricated steel pipe, the pipe diameter of the prefabricated steel pipe is gradually reduced from inside to outside, a plurality of cutting seams (6-1) are formed in the pipe section of the anchoring and expanding pipe (6), the cutting seams (6-1) are uniformly distributed along the circumferential direction of the outer end of the anchoring and expanding pipe (6), and the cutting seams (6-1) are straight-cut gaps from the outer side to the inner side of the prefabricated steel pipe.
3. An expandable anchoring device according to claim 1, wherein: the anchoring plug comprises a movable rod (7) extending into the connecting pipe (5) and a plug (8) which is arranged at the outer end of the movable rod (7) and is coaxially arranged with the movable rod (7); the moving rod (7) is connected with the dowel bar (9) in a plug-in manner; the plug (8) is clamped at the outer end of the movable rod (7); the grouting channel comprises a communicating hole formed in the moving rod (7) and a grouting through hole assembly formed in the plug (8), the communicating hole and the moving rod (7) are coaxially arranged, and the communicating hole and the grouting through hole assembly are communicated with the anchor pipe (3).
4. An expandable anchoring device according to claim 3, wherein: the grouting through hole assembly comprises a longitudinal through hole (8-1) arranged at the outer end of the plug (8) and a plurality of circumferential through holes (8-2) arranged on the plug (8); the longitudinal through hole (8-1) and the plug (8) are coaxially arranged, and the longitudinal through hole (8-1) is communicated with the communicating hole; the plurality of annular through holes (8-2) are uniformly distributed along the circumferential direction of the plug (8), and each annular through hole (8-2) is communicated with the longitudinal through hole (8-1).
5. A method of anchoring an expandable anchoring device according to claim 1, characterized in that: the method comprises the following steps:
step one, assembling an expandable anchoring assembly outside a hole: welding the outer end of the connecting pipe (5) and the inner end of the anchoring expansion pipe (6), and then welding the welded connecting pipe (5) and the outer end of the anchor pipe (3); inserting a moving rod (7) on the anchoring plug into the connecting pipe (5) to be fixedly connected with the outer end of the connecting pipe (5) to assemble an expandable anchoring assembly;
step two, drilling: drilling an anchor hole for installing the expandable anchoring device;
step three, inserting an expandable anchoring assembly in the hole: the assembled expandable anchoring assembly is driven into the anchor hole from inside to outside until the outer end of the plug (8) is abutted against the bottom of the anchor hole;
step four, adjusting the expandable anchoring assembly in the hole: inserting a dowel bar (9) into the anchor pipe (3) and inserting the outer end of the dowel bar (9) on the movable rod (7); rotating the dowel bar (9) to drive the anchoring plug to rotate towards the inner end of the anchor pipe (3); the plug (8) extrudes the anchoring expansion pipe (6) in the rotating process, so that the end part of the anchoring expansion pipe (6) is expanded until the plug (8) is clamped at the outer port of the connecting pipe (5), and the dowel bar (9) stops rotating; then withdrawing the dowel bar (9) from the anchor tube (3);
step five, grouting: and grouting from the inner end of the anchor pipe (3) to the outer end of the anchor pipe (3), wherein the grouting liquid forms an anchoring expansion end (10) at the outer end of the plug (8) through the grouting channel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457565.4A CN112554183A (en) | 2020-12-11 | 2020-12-11 | Expandable anchoring device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011457565.4A CN112554183A (en) | 2020-12-11 | 2020-12-11 | Expandable anchoring device and method |
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| US20030208974A1 (en) * | 2002-02-25 | 2003-11-13 | James Creed | Mechanical device for flaring a piling member |
| CN103696792A (en) * | 2014-01-17 | 2014-04-02 | 山东科技大学 | Multi-stage conical synchronous expansion anchor rod |
| CN104061009A (en) * | 2014-05-16 | 2014-09-24 | 山东科技大学 | Multi-section expansion yielding prestressed grouting anchor cable and application method thereof |
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