CN112593987A - Bonding anchoring type first-anchoring yielding hollow anchor rod and anchoring method - Google Patents
Bonding anchoring type first-anchoring yielding hollow anchor rod and anchoring method Download PDFInfo
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- CN112593987A CN112593987A CN202011555419.5A CN202011555419A CN112593987A CN 112593987 A CN112593987 A CN 112593987A CN 202011555419 A CN202011555419 A CN 202011555419A CN 112593987 A CN112593987 A CN 112593987A
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- 238000004873 anchoring Methods 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 239000011440 grout Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 230000008602 contraction Effects 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 abstract description 22
- 230000008093 supporting effect Effects 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract description 2
- 235000017491 Bambusa tulda Nutrition 0.000 abstract description 2
- 241001330002 Bambuseae Species 0.000 abstract description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract description 2
- 239000011425 bamboo Substances 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 27
- 238000010276 construction Methods 0.000 description 13
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 239000003245 coal Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
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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
-
- 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
- E21D21/0093—Accessories
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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)
- Piles And Underground Anchors (AREA)
Abstract
A bonding anchoring type first-anchoring yielding hollow anchor rod and an anchoring method have the advantages that a good supporting effect is still achieved under the condition of large deformation of surrounding rocks so as to guarantee stability of a tunnel, the problem of large deformation requirements of the surrounding rocks of the tunnel is met, the anchor rod is installed quickly, and the technical problem of stirring and anchoring of the bonding anchoring type first-anchoring hollow anchor rod is solved. The rear portion of the hollow anchor rod body is provided with a constant-resistance yielding mechanism, and the constant-resistance yielding mechanism comprises an outer sleeve, a yielding cylinder and a yielding nut. The pressing cylinder is sleeved in the outer sleeve, the far end and the near end of the pressing cylinder are provided with guide sections in sliding fit with the annular inner wall of the outer sleeve, and a deformation section formed by radial inward shrinkage is arranged between the guide sections at the far end and the near end. The distal end of outer sleeve is the spacing ring that radially contracts and form, and the rear portion of the cavity stock body of rod passes the spacing ring and lets press a section of thick bamboo inner chamber, lets press nut and cavity stock body of rod threaded connection and act on the inner wall of near-end direction section and deformation section changeover portion, and the terminal surface of distal end direction section is used in the spacing ring. The base plate is sleeved on the outer sleeve, the nut is in threaded connection with the external thread section at the rear part of the outer sleeve, and the front end face of the nut acts on the surface of the base plate.
Description
Technical Field
The invention relates to the technical field of surrounding rock support of large-deformation surrounding rock sections of tunnels and underground engineering, in particular to a bonding anchoring type first-anchoring yielding hollow anchor rod and an anchoring method.
Background
The method comprises the following steps of firstly anchoring the hollow anchor rod, completing the structural form of the hollow anchor rod by bonding and anchoring the whole length by two procedures, wherein the procedures comprise the steps of firstly partially anchoring the front end of the hollow anchor rod, then completing the installation of accessories such as a backing plate, a nut and the like, and finally filling and grouting the anchor hole of the part which is not anchored. The adhesive anchoring type first-anchoring type hollow anchor rod generally adopts quick-setting roll type anchoring agent to quickly anchor the anchor rod and the wall of the anchor hole, so that the hollow anchor rod support has a wide application range, including various hard rocks and soft rocks.
Because the cost of the resin anchoring agent is far more expensive than that of a cement-based grouting material, through a large amount of engineering practices, the coal roadway resin anchor rod support summarizes the matching relation among the diameters of the anchor rod body, the anchor hole and the resin roll so as to meet the requirements of advanced, rapid, simple and economical resin anchor rod support technology. The coal road resin anchor bolt support generally completes the installation of the backing plate and the nut within 60 seconds, and can apply certain pretightening force. However, in the tunnel anchor rod support, the thickness of the bonding anchoring material around the anchor rod is required to be at least 10mm, so that the diameter of an anchor hole of the tunnel anchor rod support is generally larger than that of a coal roadway; in the tunnel anchor rod support, due to the cost consideration, the hollow anchor rod cannot be anchored by using a resin roll in the whole length, so that the bonding anchoring type first-anchoring hollow anchor rod needs to design a first-anchoring section resin anchoring scheme.
One of the key processes of the construction of the bonding anchoring type first-anchoring type hollow anchor rod support is how to send the roll type anchoring agent into the bottom of an anchor hole. At present, three schemes are provided, one of which is that a roll type anchoring agent is put into a special mechanism at the front end of a hollow anchor rod, and the roll type anchoring agent is sent to the bottom of an anchor hole by the hollow anchor rod; secondly, the roll type anchoring agent is manually put into the anchor hole, and the hollow anchor rod pushes the anchoring agent to the bottom of the anchor hole; thirdly, high-pressure air of special equipment is adopted to send the roll type anchoring agent into the bottom of the anchoring hole. Any solution cannot damage the outer package of the anchoring agent during the process of feeding the resin roll anchoring agent into the bottom of the anchoring hole. Once the roll-type anchoring agent is delivered to the bottom of the anchor hole, the exposed end of the hollow anchor rod is pushed and rotated, and the front end mechanism of the anchor rod can crush the roll-type anchoring agent, so that the aim of quick anchoring is fulfilled. The first roll type anchoring agent feeding and crushing anchoring scheme has been specifically solved, but the second and third roll type anchoring agent feeding and crushing anchoring schemes have been still solved.
A large number of high-ground-stress tunnels are encountered in the construction of railways in mountainous areas in western regions such as Sichuan-Tibet railways, Changlan railways and the like, and surrounding rocks often have the characteristic of large deformation, particularly soft rock large deformation, rock burst large deformation and impact large deformation. But the existing anchor rod has low elongation rate and cannot adapt to the characteristic of large deformation of tunnel surrounding rocks. When the surrounding rock is greatly deformed, the deformation of the tunnel surrounding rock can exceed the range which can be borne by the anchor rod due to the large energy at the initial deformation stage, so that the failure of supporting equipment such as the anchor rod can be caused, and further accidents such as tunnel collapse can be caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing a bonding anchoring type first-anchored yielding hollow anchor rod, which still has good supporting function under the condition of large deformation of surrounding rock so as to ensure the stability of a tunnel, meets the problem of large deformation of the surrounding rock of the tunnel, realizes the quick installation of the anchor rod and solves the technical problem of stirring and anchoring of the bonding anchoring type first-anchored hollow anchor rod.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to a bonding anchoring type first-anchoring yielding hollow anchor rod, which comprises a hollow anchor rod body, a base plate and a nut, wherein the base plate and the nut are arranged at the rear end of the hollow anchor rod body, and the bonding anchoring type first-anchoring yielding hollow anchor rod is characterized in that: the rear part of the hollow anchor rod body is provided with a constant-resistance yielding mechanism, and the constant-resistance yielding mechanism comprises an outer sleeve, a yielding cylinder and a yielding nut; the pressure-yielding cylinder is sleeved in the outer sleeve, the far end and the near end of the pressure-yielding cylinder are provided with guide sections in sliding fit with the annular inner wall of the outer sleeve, and a deformation section formed by radial inward contraction is arranged between the guide sections at the far end and the near end; the far end of the outer sleeve is a limiting ring formed by radial inward contraction, the rear part of the hollow anchor rod body penetrates through the limiting ring and the inner cavity of the pressure-yielding cylinder, the pressure-yielding nut is in threaded connection with the hollow anchor rod body and acts on the inner wall of the transition section of the near-end guide section and the deformation section, and the end face of the far-end guide section acts on the limiting ring; the base plate is sleeved on the outer sleeve, the nut is in threaded connection with the external thread section at the rear part of the outer sleeve, and the front end face of the nut acts on the plate surface of the base plate; the hollow anchor rod body is fixedly provided with a connector with a pressure bearing plate and a grout outlet hole structure, the diameter of the pressure bearing plate is matched with the diameter of the anchor hole, the hollow anchor rod body is divided into a front anchoring section from the pressure bearing plate to the far end and a rear anchoring section from the pressure bearing plate to the front far end of the outer sleeve, and the front end of the hollow anchor rod body is fixedly provided with a stirring drill bit.
Another technical problem to be solved by the present invention is to provide an anchoring method for a bonding anchoring type first-anchoring yielding hollow anchor rod, comprising the following steps:
s01, determining the anchor rod point position of the system on the tunnel wall;
s02, drilling holes and cleaning holes by adopting a trolley or a drilling machine to form anchor holes;
s03, feeding the roll-type anchoring agent into the anchor hole manually or by high-pressure air;
s04, inserting the stirring drill bit end of the hollow anchor rod body into the anchor hole, pushing the rolled anchoring agent to the far end of the anchor hole, extruding and rotating the near end of the hollow anchor rod body, enabling the stirring drill bit to stir up the rolled anchoring agent, and forming a rolled anchoring section of the anchoring agent within 2-3 minutes;
s05, sleeving a constant-resistance yielding mechanism at the rear part of the rod body of the hollow anchor rod, pushing the distal end of the outer sleeve into the anchor hole, screwing a yielding nut to enable the front part of the yielding nut to be in contact with the inner walls of the proximal end guide section and the deformation section transition section of the yielding cylinder, and installing a base plate and a nut at the outer end part of the outer sleeve;
s06, connecting the grouting pipe with the near end of the rear anchoring section for grouting, and enabling grout to enter the rear anchoring section from a grout outlet of the connector to form a cement-based grouting material anchoring section;
and S07, installing a backing plate and a nut at the proximal end of the outer sleeve, and installing a protective barrel.
The anchor rod quick mounting method has the beneficial effects that the anchor rod quick mounting is realized, the procedures of inserting, stirring, applying prestress and the like of the anchor rod are completed within 3-4 minutes, the anchor rod quick anchoring mounting is realized, and a certain prestress is applied; the slurry outlet hole on the wall of the connector cylinder provides a channel for the grouting of cement-based grouting materials into the anchor hole of the rear anchoring section, and the bearing plate can prevent rolled anchoring agents from flowing into the rear anchoring section, and can enable the cement-based grouting materials of the rear anchoring section to bear pressure, so that the bearing capacity of the anchor rod is improved; the constant-resistance yielding mechanism is arranged at the rear part of the hollow anchor rod body, the hollow rod body is tightly matched with the constant-resistance yielding mechanism, and when the axial tension of the hollow anchor rod body reaches a set value, the yielding nut extrudes the deformation section of the yielding cylinder to expand the inner diameter of the cylinder, so that the hollow rod body and the constant-resistance yielding mechanism can relatively slide for set displacement, namely, the hollow rod body and the constant-resistance yielding mechanism automatically extend when tunnel surrounding rock is greatly deformed, and keep constant working resistance to absorb the energy of the surrounding rock; by predicting the large deformation of the surrounding rock of the tunnel and setting the length of the constant-resistance yielding mechanism, the tunnel can be guaranteed to have good supporting effect under the condition of large deformation of the surrounding rock so as to guarantee the stability of the tunnel; the anchoring construction method is simple and convenient, the construction efficiency of a single anchor rod is high, and the construction quality is ensured, so that the construction efficiency and the construction quality of the anchor rod of the tunnel system are improved.
Drawings
The specification includes the following eighteen figures:
FIG. 1 is a schematic structural view of a cementing-anchoring type anchor-first yielding hollow anchor rod of the present invention;
FIG. 2 is a schematic view of a connection mode of a front anchoring section and a rear anchoring section in the bonding anchoring type first-anchoring yielding hollow anchor rod of the invention;
FIG. 3 is a front view of an embodiment 1 of the stirring drill bit in a bonding anchoring type anchor-first yielding hollow anchor rod of the invention;
FIG. 4 is a side view of embodiment 1 of the stirring drill bit in a cementing-anchoring type anchor-first yielding hollow anchor rod of the invention;
FIG. 5 is a partial cross-sectional perspective view of a stir drill bit of embodiment 2 of a bonded anchor type anchor-first yielding hollow anchor rod according to the present invention;
FIG. 6 is a schematic structural diagram of a constant resistance yielding mechanism in a bonding anchoring type anchor-first yielding hollow anchor rod according to the present invention;
FIG. 7 is a longitudinal cross-sectional view of an outer sleeve of a constant resistance yielding mechanism in a bonding anchoring type anchor-first yielding hollow anchor rod according to the present invention;
FIG. 8 is a side view of an outer sleeve of a constant resistance yielding mechanism in a bonded anchoring type anchor-first yielding hollow anchor rod according to the present invention;
FIG. 9 is a longitudinal section of a pressure relief cylinder of a constant resistance pressure relief mechanism in a bonding anchoring type anchor-first type pressure relief hollow anchor rod according to the present invention;
FIG. 10 is a front view of a constant resistance yielding mechanism yielding nut in a bonding anchoring type anchor-first yielding hollow anchor rod according to the present invention;
FIG. 11 is a side view of a constant resistance yielding mechanism yielding nut in a bonded anchoring type anchor-first yielding hollow anchor rod according to the present invention;
FIG. 12 is a front view of a backing plate in a bonded anchoring type anchor-first yielding hollow anchor rod according to the present invention;
FIG. 13 is a front view of a nut in a bonded anchoring type anchor-first yielding hollow anchor rod of the present invention;
FIG. 14 is a side view of a nut in a bonded anchoring type anchor first yielding hollow bolt of the present invention;
FIG. 15 is a front view of a protective sleeve in a bonded anchoring type anchor-first yielding hollow anchor rod of the present invention;
FIG. 16 is a side view of a protective sleeve in a adhesively anchored, anchor first yielding hollow anchor rod of the present invention;
FIG. 17 is a schematic view of the anchoring operation state of a bonding anchoring type anchor-first yielding hollow anchor rod of the present invention;
fig. 18 is a schematic view of the yielding working state of the bonding anchoring type anchor-first yielding hollow anchor rod.
The figures show the main component names and the corresponding labels: the device comprises a front anchoring section 11, a rear anchoring section 12, a connector 20, a grout outlet 21, a pressure bearing plate 22, an intermediate sleeve 23, spot welding 30, a stirring drill bit 40, a cross-shaped drill bit 41, a front sleeve 42, a spiral drill bit 43, an outer sleeve 50, a limiting ring 51, an external thread section 52, a pressure yielding cylinder 60, a guide section 61, a deformation section 62, a pressure yielding nut 70, a backing plate 80, a nut 90, a protection cylinder 100, an anchor hole 110, a tunnel wall 120, a rolled anchoring section L1 and a cement-based grouting material anchoring section L2.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the bonding anchoring type first-anchoring yielding hollow anchor rod of the present invention includes a hollow anchor rod body, a backing plate 80 and a nut 90 disposed at a rear end thereof. Referring to fig. 6 to 9, a constant resistance pressure-yielding mechanism is arranged at the rear part of the hollow anchor rod body, and comprises an outer sleeve 50, a pressure-yielding cylinder 60 and a pressure-yielding nut 70. The pressure-letting cylinder 60 is sleeved in the outer sleeve 50, the far end and the near end of the pressure-letting cylinder are provided with guide sections 61 which are in sliding fit with the annular inner wall of the outer sleeve 50, and a deformation section 62 which is formed by radial inward contraction is arranged between the far end guide sections 61 and the near end guide sections 61; the distal end of outer sleeve 50 is the spacing ring 51 that radially contracts inwards and form, and the rear portion of the cavity stock body of rod passes spacing ring 51 and lets presses a section of thick bamboo 60 inner chamber, lets press nut 70 and cavity stock body of rod threaded connection and act on the inner wall of near-end direction section 61 and the section of deformation 62 changeover portion, and the terminal surface of distal end direction section 61 is used in spacing ring 51. The backing plate 80 is sleeved on the outer sleeve 50, the nut 90 is in threaded connection with the external thread section 52 at the rear part of the outer sleeve 50, and the front end face of the nut 90 acts on the plate surface of the backing plate 80. And a reasonable yielding load is set, and the constant-resistance yielding mechanism reasonably selects the thickness and the material ductility of the yielding cylinder 60 to realize the automatic extension of the anchor rod under the yielding load condition. When tunnel surrounding rock is greatly deformed, the hollow anchor rod body is automatically extended by extruding the deformation section 62 of the pressing cylinder 60 to enlarge the cylinder inner diameter through the yielding nut 70, constant working resistance is kept, and surrounding rock energy is absorbed. The length of the constant-resistance yielding mechanism is set by predicting the large deformation of the surrounding rock of the tunnel, so that the tunnel can be guaranteed to be stable under the condition of large deformation of the surrounding rock.
Referring to fig. 1, a connector 20 having a structure of a pressure plate 22 and a grout outlet 21 is fixedly disposed on the hollow anchor rod body, the diameter of the pressure plate 22 is adapted to the bore diameter of the anchor hole 110, the hollow anchor rod body is divided into a front anchoring section 11 from the pressure plate 22 to the distal end and a rear anchoring section 12 from the pressure plate 22 to the front distal end of the outer sleeve 50, and a stirring drill bit 40 is fixedly disposed at the front end of the hollow anchor rod body.
After the anchor hole 110 is formed, the rolled anchoring agent is sent into the anchor hole 110 by manual feeding or special equipment high-pressure air, then the hollow anchor rod body is inserted to push the rolled anchoring agent to the bottom of the anchor hole 110, then the backing plate 80 is installed in place, the hollow anchor rod body is pushed inwards and rotated, the stirring drill bit 40 stirs the outer bag of the rolled anchoring agent, and a rolled anchoring section L1 of the rolled anchoring agent is formed within 2-3 minutes. And then, sleeving a constant-resistance yielding mechanism at the rear part of the hollow anchor rod body, pushing the distal end of the outer sleeve 50 into the anchor hole 110, screwing the yielding nut 70 to enable the front part of the yielding nut to be in contact with the inner walls of the transition sections of the proximal guide section 61 and the deformation section 62 of the yielding cylinder 60, and installing the backing plate 80 and the nut 90 at the outer end part of the outer sleeve 50.
Referring to fig. 10 and 11, the front portion of the crush nut 70 has a spherical shape. Referring to fig. 17 and 18, a protection cylinder 100 is disposed at the rear of the outer sleeve 50 and is screwed to the external thread section 52, and the front end of the protection cylinder 100 is in contact with the rear end surface of the nut 90 to shield the exposed section of the outer sleeve 50.
Referring to fig. 2, the hollow anchor rod body may be an integral type, that is, the hollow anchor rod body is a full-length threaded pipe, the connector 20 is disposed on the hollow anchor rod body through threaded connection and fixed with the hollow anchor rod body through spot welding 30, and the grout outlet 21 is communicated with the inner cavity of the rear anchoring section 12. Or, the hollow anchor rod body is formed by butt joint of a front anchoring section 11 and a rear anchoring section 12, the front anchoring section 11 and the rear anchoring section 12 are full-length threaded pipes, the front end of a connector 20 is in threaded connection with the rear end of the front anchoring section 11, the rear portion of the connector 20 is in threaded connection with the front end of the rear anchoring section 12, and a grout outlet 21 is communicated with the inner cavity of the rear anchoring section 12. The upper bearing plate 22 and the middle sleeve 23 of the connector 20 are of an integral structure, the inner wall of the middle sleeve 23 is provided with an internal thread matched with the external thread of the hollow anchor rod body, and the two slurry outlet holes 21 are symmetrically arranged on the wall of the middle sleeve 23.
Referring to fig. 3 and 4, the cross-shaped drill 41 and the front sleeve 42 of the stirring drill 40 are integrated, and the front sleeve 42 is fixedly installed at the front end of the front anchoring section 11 through threaded connection. Referring to fig. 5, alternatively, the stirring drill 40 is composed of a spiral drill 43 and a front sleeve 42, the spiral drill 43 is welded and fixed to the front end of the front sleeve 42, and the front sleeve 42 is fixedly installed at the front end of the front anchoring section 11 through a threaded connection.
Referring to fig. 17 and 18, the anchoring method of the adhesive anchoring type anchor-first yielding hollow anchor rod of the present invention includes the steps of:
s01, determining the anchor rod point position of the system on the tunnel wall 120;
s02, drilling and cleaning holes by adopting a trolley or a drilling machine to form the anchor hole 110;
s03, manually feeding the roll-type anchoring agent into the anchor hole 110 or feeding the roll-type anchoring agent into the anchor hole 110 by high-pressure air;
s04, inserting the end of the stirring drill bit 40 of the hollow anchor rod body into the anchor hole 110, pushing the rolled anchoring agent to the far end of the anchor hole 110, extruding and rotating the near end of the hollow anchor rod body, enabling the stirring drill bit 40 to stir up the rolled anchoring agent, and forming a rolled anchoring section L1 in 2-3 minutes;
s05, sleeving a constant-resistance yielding mechanism at the rear part of the hollow anchor rod body, pushing the distal end of the outer sleeve 50 into the anchor hole 110, screwing the yielding nut 70 to enable the front part of the yielding nut to be in contact with the inner walls of the transition sections of the proximal end guide section 61 and the deformation section 62 of the yielding cylinder 60, and installing the backing plate 80 and the nut 90 at the outer end part of the outer sleeve 50;
s06, connecting the grouting pipe with the near end of the rear anchoring section 12 for grouting, and enabling grout to enter the rear anchoring section L2 from the grout outlet 21 of the connector 20 to form a cement-based grouting material anchoring section L2;
s07, mounting the backing plate 70 and nut 80 at the proximal end of the outer sleeve 50, and mounting the protective sleeve 90.
The anchoring construction method is simple and convenient, the construction efficiency of a single anchor rod is high, and the construction quality is ensured, so that the construction efficiency and the construction quality of the anchor rod of the tunnel system are improved.
The foregoing is illustrative only of the principles of a cohesive anchoring type anchor-first yielding hollow anchor rod and method of anchoring of the present invention and is not intended to limit the invention to the exact construction and application shown and described, and accordingly, all modifications and equivalents that may be resorted to are intended to fall within the scope of the invention.
Claims (8)
1. The utility model provides an anchor formula is let and is pressed cavity stock earlier to bonding anchor type, includes the cavity stock body of rod and sets up backing plate (80), nut (90) at its rear end, characterized by: the rear part of the hollow anchor rod body is provided with a constant-resistance yielding mechanism, and the constant-resistance yielding mechanism comprises an outer sleeve (50), a yielding cylinder (60) and a yielding nut (70); the pressure cylinder (60) is sleeved in the outer sleeve (50), the far end and the near end of the pressure cylinder are provided with guide sections (61) in sliding fit with the annular inner wall of the outer sleeve (50), and a deformation section (62) formed by radial inward contraction is arranged between the far end guide sections (61) and the near end guide sections (61); the far end of the outer sleeve (50) is a limiting ring (51) formed by radial inward contraction, the rear part of the hollow anchor rod body penetrates through the limiting ring (51) and an inner cavity of the pressure-yielding cylinder (60), the pressure-yielding nut (70) is in threaded connection with the hollow anchor rod body and acts on the inner wall of the transition section of the near-end guide section (61) and the deformation section (62), and the end face of the far-end guide section (61) acts on the limiting ring (51); the backing plate (80) is sleeved on the outer sleeve (50), the nut (90) is in threaded connection with the external thread section (52) at the rear part of the outer sleeve (50), and the front end face of the nut (90) acts on the plate surface of the backing plate (80); the hollow anchor rod body is fixedly provided with a connector (20) with a pressure bearing plate (22) and a grout outlet hole (21) structure, the diameter of the pressure bearing plate (22) is matched with the hole diameter of the anchor hole (110), the hollow anchor rod body is divided into a front anchoring section (11) from the pressure bearing plate (22) to the far end and a rear anchoring section (12) from the pressure bearing plate (22) to the front far end of the outer sleeve (50), and a stirring drill bit (40) is fixedly arranged at the front end of the hollow anchor rod body.
2. The adhesively anchored, anchor-first yielding hollow anchor rod as claimed in claim 1, wherein: the front part of the yielding nut (70) is spherical.
3. The adhesively anchored, anchor-first yielding hollow anchor rod as claimed in claim 1, wherein: the rear part of the outer sleeve (50) is provided with a protective cylinder (100) in threaded connection with the external thread section (52), the front end of the protective cylinder (100) is in contact with the rear end face of the nut (90), and the exposed section of the outer sleeve (50) is shielded.
4. The adhesively anchored, anchor-first yielding hollow anchor rod as claimed in claim 1, wherein: the hollow anchor rod body is a full-length threaded pipe, the connector (20) is arranged on the hollow anchor rod body through threaded connection, the grout outlet hole (21) is communicated with the inner cavity of the rear anchoring section (12), and the connector is fixed with the hollow anchor rod body through spot welding (30).
5. The adhesively anchored, anchor-first yielding hollow anchor rod as claimed in claim 1, wherein: the front anchoring section (11) and the rear anchoring section (12) are full-length threaded pipes, the front end of the connector (20) is in threaded connection with the rear end of the front anchoring section (11), the rear portion of the connector (20) is in threaded connection with the front end of the rear anchoring section (12), and the grout outlet hole (21) is communicated with the inner cavity of the rear anchoring section (12).
6. The adhesively anchored, anchor-first yielding hollow anchor rod as claimed in claim 1, wherein: the upper bearing plate (22) of the connector (20) and the middle sleeve (23) are of an integral structure, the inner wall of the middle sleeve (23) is provided with an internal thread matched with the external thread of the hollow anchor rod body, and the two slurry outlet holes (21) are symmetrically arranged on the cylinder wall of the middle sleeve (23).
7. The adhesively anchored, anchor-first yielding hollow anchor rod as claimed in claim 1, wherein: the cross-shaped drill bit (41) on the stirring drill bit (40) and the front sleeve (42) are integrated, and the front sleeve (42) is fixedly installed at the front end of the front anchoring section (11) through threaded connection; or the stirring drill bit (40) is composed of a spiral drill bit (43) and a front sleeve (42), the spiral drill bit (43) is fixedly welded at the front end of the front sleeve (42), and the front sleeve (42) is fixedly installed at the front end of the front anchoring section (11) through threaded connection.
8. The anchoring method using the adhesively anchored type anchor-first yielding hollow bolt as claimed in any one of claims 1 to 7, comprising the steps of:
s01, determining the anchor point position of the system on the tunnel wall (120);
s02, drilling and cleaning holes by adopting a trolley or a drilling machine to form anchor holes (110);
s03, manually feeding the roll-type anchoring agent into the anchor hole (110) or feeding the roll-type anchoring agent into the anchor hole (110) by high-pressure air;
s04, inserting the end of the stirring drill bit (40) of the hollow anchor rod body into the anchor hole (110), pushing the rolled anchoring agent to the far end of the anchor hole (110), extruding and rotating the near end of the hollow anchor rod body, enabling the stirring drill bit (40) to stir up the rolled anchoring agent, and forming a rolled anchoring section (L1) of the rolled anchoring agent within 2-3 minutes;
s05, sleeving a constant-resistance yielding mechanism at the rear part of the hollow anchor rod body, pushing the far end of an outer sleeve (50) into an anchor hole (110), screwing a yielding nut (70) to enable the front part of the yielding nut to be in contact with the inner walls of the transition section of the near-end guide section (61) and the deformation section (62) of the yielding cylinder (60), and installing a backing plate (80) and a nut (90) at the outer end part of the outer sleeve (50);
s06, connecting the grouting pipe with the near end of the rear anchoring section 12 for grouting, and enabling grout to enter the rear anchoring section (L2) from a grout outlet (21) of the connector (20) to form a cement-based grouting material anchoring section (L2);
s07, installing a backing plate (70) and a nut (80) at the proximal end of the outer sleeve (50), and installing a protective cylinder (90).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011555419.5A CN112593987A (en) | 2020-12-24 | 2020-12-24 | Bonding anchoring type first-anchoring yielding hollow anchor rod and anchoring method |
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| CN202011555419.5A CN112593987A (en) | 2020-12-24 | 2020-12-24 | Bonding anchoring type first-anchoring yielding hollow anchor rod and anchoring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115788538A (en) * | 2023-01-31 | 2023-03-14 | 中国矿业大学(北京) | Constant-resistance large-deformation hollow grouting-resin coupling anchoring bolt |
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2020
- 2020-12-24 CN CN202011555419.5A patent/CN112593987A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115788538A (en) * | 2023-01-31 | 2023-03-14 | 中国矿业大学(北京) | Constant-resistance large-deformation hollow grouting-resin coupling anchoring bolt |
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