CN218581626U - Anchor rod device in surrounding rock plastic zone - Google Patents
Anchor rod device in surrounding rock plastic zone Download PDFInfo
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- CN218581626U CN218581626U CN202221656727.1U CN202221656727U CN218581626U CN 218581626 U CN218581626 U CN 218581626U CN 202221656727 U CN202221656727 U CN 202221656727U CN 218581626 U CN218581626 U CN 218581626U
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- packer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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Abstract
The utility model belongs to the technical field of tunnel surrounding rock supporting construction, in particular to an anchor rod device in a surrounding rock plastic area, which comprises a packer, a grouting conduit and a hollow anchor rod, wherein the hollow anchor rod is externally connected with the grouting conduit through the packer, and grouting liquid is injected into the grouting conduit; the problem of current stock and rock mass bond badly within a definite time, the anchor effect of anchor section is not good, can't further improve the problem that the plastic zone of country rock destroys the deformation, the utility model discloses can effectively strengthen the adhesive action between anchor body and rock mass, improve the anchor effect of anchor section, can improve the plastic zone of country rock and destroy, prevent further deformation in tunnel.
Description
Technical Field
The utility model belongs to the technical field of the construction is strutted to tunnel country rock, concretely relates to stock device in country rock plastic zone.
Background
The elastic-plastic support theory of rock mechanics at present considers that the formation and deformation of a plastic zone of surrounding rock after tunnel excavation are the reasons for generating ground pressure, and advocates that the development of the plastic zone is limited by a support means, the loosening and the damage of the surrounding rock are prevented, and the surrounding rock is controlled to be in an elastic-plastic state. Through theoretical and practical verification, anchor bolt support is an effective and common support means.
Under the influence of the pressure of the covering layer and surrounding rocks, part of mountain tunnels are often in deformation damage. For this reason, the person concerned will usually choose bolting as a countermeasure. However, due to some potential reasons, the traditional anchor rod often cannot exert the best performance, such as severe plastic damage of tunnel surrounding rock, poor slurry filling effect of the top end of the anchor rod and the like.
The Chinese patent document with publication number CN211448732U and publication date of 2020, 9 and 8 discloses a hollow anchor rod grouting device for a tunnel, which comprises an inner wall, an anchor rod hole, a hollow anchor rod, a quick-hardening anchoring agent, a grouting machine, a pressure-relief sealing plug structure, a sealing and fixing grouting pipe structure, a connectable and fixed pipe structure, a connecting hose, a hanging plate, a hanging rod, a groove and a rotary blocking rod, wherein the anchor rod hole is formed in the middle position inside the right side of the inner wall; the hollow anchor rod is inserted in the middle of the right inside of the anchor rod hole. According to the sealing rubber plug, the venting pressure relief hole, the pressure relief pipe and the vent hole are arranged in a manner that the shielding sealing plate and the first sealing gasket are matched with each other, so that sealing work is facilitated in the grouting process, and the phenomenon that material flows out to influence the grouting work in the grouting process is prevented; the arrangement of the grouting pipe, the fixed connecting plate, the rubber ring, the second sealing gasket and the wing bolt is beneficial to the sealing work of the grouting pipe, and the material outflow in the working process is prevented from influencing the grouting work; the problems that the adhesion between the anchoring body and the rock mass is poor, the anchoring effect of the anchoring section is poor, the plastic damage of surrounding rocks is serious, and the further deformation of the tunnel cannot be prevented are not solved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of anchor rod device purpose in country rock plastic zone is overcome and bonds badly between current stock and rock mass, and the anchor effect of anchor section is not good, can't further improve the problem that country rock plastic zone destroyed the deformation.
Therefore, the utility model provides an anchor rod device in surrounding rock plastic region, including packer, slip casting pipe and cavity stock, the cavity stock passes through packer external connection slip casting pipe, injects the slip casting liquid in the slip casting pipe.
Preferably, the hollow anchor rod is in the shape of a straight rod, a through hole is formed in the straight rod along the central axis, one end of the through hole penetrates through one end of the straight rod, and the other end of the straight rod is closed.
Preferably, the packers include a first packer and a second packer, the first packer and the second packer being spaced apart from each other and connected to the hollow bolt.
Preferably, the second packer is located at the boundary of the zone of plastic deformation of the surrounding rock and the zone of anchoring.
Preferably, the slip casting pipe includes first slip casting pipe, second slip casting pipe and third slip casting pipe, and the exit end of first slip casting pipe, the middle body of second slip casting pipe and the middle body of third slip casting pipe are connected cavity stock entry section through first packer, and the second packer is worn out to the export section body of second slip casting pipe through the exit end that second packer connected cavity stock and second slip casting pipe, and the exit end of third slip casting pipe is located between first packer and the second packer.
Preferably, a first hole is formed in the second grouting pipe at the position of the second packer.
Preferably, a second hole is formed in the rod body between the second packer and the closed end of the hollow anchor rod.
Preferably, the closed end of the hollow anchor rod is conical in shape, and the conical tip is outward.
Preferably, grouting liquid is injected into the first grouting pipe, the second grouting pipe and the third grouting pipe, the grouting liquid in the first grouting pipe and the third grouting pipe is made of polyurethane improved materials, and the grouting liquid in the second grouting pipe is made of expansion type mortar.
The utility model has the advantages that:
1. the utility model provides an anchor rod device in a plastic area of surrounding rock, which comprises a packer, a grouting conduit and a hollow anchor rod, wherein the hollow anchor rod is externally connected with the grouting conduit through the packer; insert in the drilling in country rock plastic zone the utility model discloses an anchor rod device in this kind of country rock plastic zone through the slip casting pipe to the injected slurry liquid in the drilling, improves the anchor effect of anchor section, and the packer can ensure the body of rod of anchor section cavity stock and the effective bonding between the country rock to the anchor rod device in reinforcing country rock plastic zone and the bonding between the rock mass improve the anchor strength of anchor body.
2. The utility model provides an anchor rod device in this kind of country rock plastic region, through set up porose one on the second slip casting pipe of second packer position department to pour into the expanded type mortar into to the second slip casting intraductal, the mortar can get into the second packer through the pore one, fills this second packer and makes its inflation, can seal the anchor section after the second packer fully expands to prevent that the expanded type mortar from permeating the free section; the expansion type mortar enters from a second hole formed in the rod body between the second packer and the closed end of the hollow anchor rod and is discharged through the through hole, and the anchoring section can be determined to be well filled with the mortar; the bonding effect between the anchoring body and the rock mass can be effectively enhanced, and the anchoring effect of the anchoring section is improved.
3. The utility model provides an anchor rod device in this kind of country rock plastic property district pours into polyurethane improved material into through first slip casting pipe in to first packer to make its abundant inflation, treats that above-mentioned polyurethane improved material solidifies the back, through pouring into polyurethane improved material into to the third slip casting pipe, compares with the mortar, and the slip casting adopts polyurethane improved material to slow down the trend that the tunnel warp to a certain extent as free thick liquid; if meeting soft rock strata such as mudstone, shale, etc., adopting this polyurethane improved material can also prevent that soft rock from meeting water after, geological conditions further worsens, can improve the destruction of surrounding rock plastic zone, prevents further deformation of tunnel.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a front view of the construction of a rock bolt assembly in a plastic zone of surrounding rock;
fig. 2 is a left side view of the construction of the bolting means in the plastic zone of the surrounding rock.
Description of reference numerals: 1. a packer; 2. a grouting guide pipe; 3. a hollow anchor rod; 4. a surrounding rock plastic deformation zone; 5. an anchor region; 101. a first packer; 102. a second packer; 103. a seal member; 201. a first grouting pipe; 202. a second grouting pipe; 203. a third grouting pipe; 204. a first hole; 301. a through hole; 302. and a second hole.
Detailed Description
Example 1:
as shown in fig. 1 and 2, the anchor rod device for the plastic area of the surrounding rock comprises a packer 1, a grouting guide pipe 2 and a hollow anchor rod 3, wherein the hollow anchor rod 3 is externally connected with the grouting guide pipe 2 through the packer 1, and grouting liquid is injected into the grouting guide pipe 2.
During specific operation, firstly, drilling is carried out, and a surrounding rock plastic zone is identified by obtaining a core sample (in large-scale anchoring operation, an anchor rod shaft dynamometer and a rod displacement meter can be adopted, and an in-hole camera shooting technology is combined, so that the surrounding rock plastic zone can be identified more accurately); then drilling a hole in the plastic zone of the surrounding rock; at last, the anchor rod device in the surrounding rock plastic area is inserted into the drilled hole, grouting liquid is injected into the drilled hole through the grouting guide pipe 2, after the injected grouting liquid is solidified, the anchoring effect of the anchoring section is improved, the packer 1 can ensure effective bonding between the rod body of the hollow anchor rod 3 in the anchoring section and the surrounding rock, therefore, the bonding effect between the anchor rod device in the surrounding rock plastic area and the rock body is enhanced, and the anchoring strength of the anchoring body is improved.
Example 2:
in addition to embodiment 1, the hollow anchor rod 3 is shaped as a straight rod, a through hole 301 is formed along the central axis of the straight rod, one end of the through hole 301 penetrates through one end of the straight rod, and the other end of the straight rod is closed.
That is, the left end of the through hole 301 in fig. 1 is communicated with the outside, and the right end of the through hole 301 is not communicated with the outside, so that the structure is simple, and the grouting guide pipe 2 and the packer 1 can be conveniently connected.
Preferably, the packer 1 comprises a first packer 101 and a second packer 102, and the first packer 101 and the second packer 102 are connected to the hollow anchor rod 3 at intervals.
The grouting liquid is filled in sections, the filling effect is good, and the anchoring effect of the anchoring section is improved.
Preferably, the second packer 102 is located at the interface of the zone of plastic deformation 4 of the surrounding rock and the zone of anchoring 5.
The anchoring area 5 is an anchor rod part for anchoring the rod body and the surrounding rock through grouting, and the length of the hollow anchor rod 3 and the position of the second packer 102 can be determined based on the grasping of the surrounding rock plastic area information.
Preferably, a first hole 204 is formed in the second grouting pipe 202 at the position of the second packer 102.
Facilitating the entry of the injection fluid into the second packer 102, inflating the second packer 102 to set.
Preferably, a second hole 302 is formed in the rod body between the second packer 102 and the closed end of the hollow anchor rod 3.
The grouting flow and the grouting pressure of the grouting liquid entering the hollow anchor rod 3 from the second hole 302 are conveniently controlled.
Preferably, the number of the second holes 302 is multiple, and the multiple second holes 302 are distributed at equal intervals along the circumference of the hollow anchor rod 3.
Preferably, the grouting conduit 2 comprises a first grouting pipe 201, a second grouting pipe 202 and a third grouting pipe 203, the outlet end of the first grouting pipe 201, the intermediate pipe body of the second grouting pipe 202 and the intermediate pipe body of the third grouting pipe 203 are connected with the inlet section of the hollow anchor rod 3 through the first packer 101, the outlet section pipe body of the second grouting pipe 202 is connected with the hollow anchor rod 3 through the second packer 102, the outlet end of the second grouting pipe 202 penetrates out of the second packer 102, and the outlet end of the third grouting pipe 203 is located between the first packer 101 and the second packer 102.
Preferably, grouting liquid is injected into the first grouting pipe 201, the second grouting pipe 202 and the third grouting pipe 203, the grouting liquid in the first grouting pipe 201 and the third grouting pipe 203 is made of polyurethane improved material, and the grouting liquid in the second grouting pipe 202 is made of expansion type mortar.
When anchoring, firstly, a first hole 204 is formed in a second grouting pipe 202 at the position of the second packer 102, and expansion type mortar is injected into the second grouting pipe 202, the mortar enters the second packer 102 through the first hole 204, the second packer 102 is filled and expanded, and the anchoring section can be sealed after the second packer 102 is completely expanded so as to prevent the expansion type mortar from permeating into the free section; the expansion type mortar enters from a second hole 302 formed in the rod body between the second packer 102 and the closed end of the hollow anchor rod 3 and is discharged through the through hole 301, and the anchoring section is determined to be well filled with the mortar; the bonding effect between the anchoring body and the rock mass can be effectively enhanced, and the anchoring effect of the anchoring section is improved; then, injecting a polyurethane improved material into the first packer 101 through the first grouting pipe 201, fully expanding the polyurethane improved material, and after the polyurethane improved material is solidified, injecting the polyurethane improved material into the third grouting pipe 203, wherein compared with mortar, the grouting liquid adopts the polyurethane improved material as free slurry, so that the deformation tendency of the tunnel can be slowed down to a certain extent; if meeting soft rock stratums such as mudstone and shale, the adoption of the polyurethane improved material can also prevent the geological condition from further worsening after the soft rock meets water, improve the damage of the plastic zone of surrounding rock and prevent the further deformation of the tunnel.
Preferably, the closed end of the hollow anchor rod 3 is conical in shape with the conical tip facing outward.
The resistance of the hollow anchor rod 3 to entering the borehole can be reduced.
Preferably, sealing elements 103 are connected to both ends of the first packer 101 and both ends of the second packer 102.
The sealing effect is improved, and the leakage of the grout entering the first packer 101 and the second packer 102 is avoided.
Preferably, the first packer 101 is a resin packer; the resin packer has good corrosion resistance and long service life.
Preferably, the second packer 102 is made of hydrogenated nitrile rubber. Has good tensile strength and durability, and the sealing and bearing capacity can reach 15-20 MPa.
Preferably, the sealing member 103 is a sealing rubber ring. The sealing rubber ring has the characteristics of excellent corrosion resistance, tear resistance, compression deformation resistance and high temperature resistance.
The utility model discloses an anchor rod device in country rock plastic property district's theory of operation does:
inserting an anchor rod device of the plastic zone of the surrounding rock into a drill hole of the plastic zone of the surrounding rock, injecting expansion type mortar into the second grouting pipe 202, enabling the expansion type mortar to enter the second packer 102 through the first hole 204, filling the second packer 102 and enabling the second packer 102 to expand, and sealing the anchoring section after the second packer 102 is completely expanded so as to prevent the expansion type mortar from penetrating into the free section; the expansion type mortar enters from the second hole 302 and is discharged from the opening end of the through hole 301, and therefore the anchoring section can be determined to be well filled with the mortar; the bonding effect between the anchoring body and the rock mass can be effectively enhanced, and the anchoring effect of the anchoring section is improved; then, injecting a polyurethane improved material into the first packer 101 through the first grouting pipe 201, fully expanding the first packer 101, and after the polyurethane improved material is solidified, injecting the polyurethane improved material into the third grouting pipe 203, wherein compared with mortar, the grouting liquid adopts the polyurethane improved material as free slurry, so that the deformation tendency of the tunnel can be slowed down to a certain extent; if meeting soft rock strata such as mudstone, shale, etc., adopting this polyurethane improved material can also prevent that soft rock from meeting water after, geological conditions further worsens, can improve the destruction of surrounding rock plastic zone, prevents further deformation of tunnel.
In the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "left", "inner", "right", etc., it is based on the orientation or positional relationship shown in the drawings, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are for illustrative purposes only and are not to be construed as limiting the present invention.
The above illustration is merely an illustration of the present invention, and does not limit the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.
Claims (7)
1. The utility model provides an anchor rod device in country rock plastic region which characterized in that: the grouting device comprises a packer (1), a grouting guide pipe (2) and a hollow anchor rod (3), wherein the hollow anchor rod (3) is connected with the grouting guide pipe (2) through the outside of the packer (1), and grouting liquid is injected into the grouting guide pipe (2); the grouting guide pipe (2) comprises a first grouting pipe (201), a second grouting pipe (202) and a third grouting pipe (203), the outlet end of the first grouting pipe (201), the middle pipe body of the second grouting pipe (202) and the middle pipe body of the third grouting pipe (203) are connected with the inlet section of the hollow anchor rod (3) through a first packer (101), the outlet section pipe body of the second grouting pipe (202) is connected with the hollow anchor rod (3) through a second packer (102), the outlet end of the second grouting pipe (202) penetrates out of the second packer (102), and the outlet end of the third grouting pipe (203) is located between the first packer (101) and the second packer (102); grouting liquid is injected into the first grouting pipe (201), the second grouting pipe (202) and the third grouting pipe (203), the grouting liquid in the first grouting pipe (201) and the third grouting pipe (203) is made of polyurethane improved materials, and the grouting liquid in the second grouting pipe (202) is made of expansion type mortar.
2. A rock bolt means for a plastics zone of surrounding rock as defined in claim 1, wherein: the hollow anchor rod (3) is in a linear rod shape, a through hole (301) is formed in the linear rod along the central axis, one end of the through hole (301) penetrates through one end of the linear rod, and the other end of the linear rod is closed.
3. A rock bolt means for a plastics zone of surrounding rock as defined in claim 2, wherein: the packer (1) comprises a first packer (101) and a second packer (102), and the first packer (101) and the second packer (102) are connected to the hollow anchor rod (3) at intervals.
4. A rock bolt means for a plastics zone of a surrounding rock as claimed in claim 3 wherein: the second packer (102) is located at the boundary of the surrounding rock plastic deformation zone (4) and the anchoring zone (5).
5. A rock bolt means for a plastics zone of surrounding rock as defined in claim 4, wherein: and a first hole (204) is formed in the second grouting pipe (202) at the position of the second packer (102).
6. A rock bolt means for a plastics zone of surrounding rock as defined in claim 5, wherein: and a second hole (302) is formed in the rod body between the second packer (102) and the closed end of the hollow anchor rod (3).
7. A rock bolt means for a plastics zone of surrounding rock as defined in claim 2, wherein: the closed end of the hollow anchor rod (3) is conical and the conical tip is outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221656727.1U CN218581626U (en) | 2022-06-29 | 2022-06-29 | Anchor rod device in surrounding rock plastic zone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221656727.1U CN218581626U (en) | 2022-06-29 | 2022-06-29 | Anchor rod device in surrounding rock plastic zone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218581626U true CN218581626U (en) | 2023-03-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221656727.1U Active CN218581626U (en) | 2022-06-29 | 2022-06-29 | Anchor rod device in surrounding rock plastic zone |
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| Country | Link |
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| CN (1) | CN218581626U (en) |
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2022
- 2022-06-29 CN CN202221656727.1U patent/CN218581626U/en active Active
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