CN112539075A - Preset internal anchor rod structure for tunnel in-situ extension project and supporting method thereof - Google Patents
Preset internal anchor rod structure for tunnel in-situ extension project and supporting method thereof Download PDFInfo
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- CN112539075A CN112539075A CN202110054312.0A CN202110054312A CN112539075A CN 112539075 A CN112539075 A CN 112539075A CN 202110054312 A CN202110054312 A CN 202110054312A CN 112539075 A CN112539075 A CN 112539075A
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008093 supporting effect Effects 0.000 title claims abstract description 26
- 238000004873 anchoring Methods 0.000 claims abstract description 52
- 239000011435 rock Substances 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims description 26
- 238000005553 drilling Methods 0.000 claims description 23
- 238000009412 basement excavation Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 239000011440 grout Substances 0.000 claims description 7
- 238000005422 blasting Methods 0.000 claims description 6
- 238000005336 cracking Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 11
- 239000002775 capsule Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/025—Grouting with organic components, e.g. resin
-
- 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
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
-
- 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)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a preset internal anchor rod structure for tunnel in-situ extension engineering and a supporting method thereof, which are characterized in that: the preset internal anchor rod structure for the tunnel in-situ extension project comprises an expanded bore hole drilled between an in-situ tunnel and an extension tunnel contour line and a small-bore hole drilled in the deep surrounding rock outside the extension tunnel contour line, an anchor rod body penetrates through the small-bore hole, the outer anchoring end of the anchor rod body extends out of the small-bore hole and is provided with a locking nut, a pull rod and a rotating sleeve sleeved on the pull rod are arranged in the expanded bore hole, the first end of the pull rod is connected with the outer end of the anchor rod body, the second end of the pull rod is connected with the moving end of a jack arranged outside the expanded bore hole, the first end of the rotating sleeve is sleeved on the locking nut, and the second end of the rotating sleeve is connected with the jack.
Description
The technical field is as follows:
the invention relates to a preset internal anchor rod structure for tunnel in-situ extension engineering and a supporting method thereof, belonging to the field of tunnel engineering.
Background art:
because the traffic volume is increased at present, a plurality of roads need to be expanded on the basis of the existing tunnel; because the extension tunnels are located in cities, the stability control of surrounding rocks is an important subject in the tunnel extension process, and the existence of the in-situ tunnels makes the pre-support of the surrounding rocks of the newly-built tunnels possible.
However, the traditional tunnel pre-support method for expanding a tunnel has a great problem in practical application, for example, in the patent "a three-dimensional reinforcement construction method suitable for expanding a collapsed tunnel, CN 110397458A", the preset anchor rod interferes with the excavation construction, and the excavation efficiency is reduced; in addition, at the moment of newly-built tunnel excavation, the outer anchor end of stock can be destroyed or lose the holding power point, loses the supporting effect basically.
The invention content is as follows:
the invention aims to solve the technical problems and provides a method which does not interfere with excavation construction and can effectively support and expand tunnel surrounding rocks in advance, namely a preset internal anchor rod structure for tunnel in-situ expansion engineering and a supporting method thereof.
The invention discloses a preset internal anchor rod structure for tunnel in-situ extension engineering, which is characterized in that: the method comprises the steps of drilling an expanded diameter drilling hole between an in-situ tunnel and an expanded tunnel contour line and drilling a small-aperture drilling hole deep in surrounding rocks outside the expanded tunnel contour line, wherein an anchor rod body penetrates through the small-aperture drilling hole, the outer anchoring end of the anchor rod body extends out of the small-aperture drilling hole and is provided with a locking nut, the outer anchoring end of the anchor rod is arranged at the excavation contour line position of a newly-built tunnel inside the surrounding rocks, and an anchoring agent is arranged between the small-aperture drilling hole and the anchor rod body.
Furthermore, a pull rod and a rotating sleeve sleeved on the pull rod are arranged in the diameter-expanded drill hole, the first end of the pull rod is connected with the outer end of the anchor rod body, the second end of the pull rod is connected with the moving end of a jack arranged outside the diameter-expanded drill hole, the first end of the rotating sleeve is sleeved on a locking nut, and the second end of the rotating sleeve is connected with the jack, so that the locking nut is driven by the rotation of the rotating sleeve to move towards the inner end of the anchor rod body and the jack pulls the anchor rod body outwards, and the anchor rod body in the small-bore drill hole generates prestress; the first end of the pull rod is provided with an internal threaded hole channel which is in threaded connection with the external thread of the anchoring end outside the anchor rod body; and the second end of the pull rod is in threaded connection with the moving end of the jack.
Furthermore, the first end of the rotating sleeve is provided with an inner hexagonal hole matched with the locking nut, and the second end of the rotating sleeve is arranged on top of the jack shell.
Furthermore, the locking nut comprises a circular ring-shaped sheet and a nut fixed on one side surface of the circular ring-shaped sheet.
Furthermore, after the pull rod, the rotary sleeve and the jack are removed, a grouting device is arranged in the hole expanding drill hole and comprises a grouting pipe and a sealing bag fixedly arranged on the grouting pipe, the sealing bag blocks the hole expanding drill hole, and a grouting hole is formed in a space, located in the hole expanding drill hole, between the sealing bag and the locking nut, of the grouting pipe.
The invention discloses a support method of a preset internal anchor rod structure for a tunnel in-situ extension project, which is characterized by comprising the following steps: the supporting method comprises the following steps: 1) drilling small-aperture drill holes outwards on the lining of the in-situ tunnel, wherein the small-aperture drill holes extend from the original tunnel lining to the depth of surrounding rocks outside the contour line of the expanded tunnel; 2) constructing an expanded borehole at the position of the lining borehole of the in-situ tunnel, wherein the expanded borehole extends from the original tunnel lining to the contour line of the expanded tunnel, and the diameter of the expanded borehole is slightly larger than that of the anchor head outside the anchor rod; 3) the anchor rod is anchored in the small-bore hole through the anchoring agent, and the outer end of the anchor rod is fixed at the bottom end of the expanded-bore hole through the locking nut.
Furthermore, when the resin anchoring agent is adopted as the anchoring agent, firstly, a cartridge of the resin anchoring agent is put into the small-aperture drill hole, and then the anchor rod is rotationally drilled through a drilling machine, so that one end of the anchor rod is anchored in the small-aperture drill hole; the anchoring agent is required to be ensured not to overflow out of the small-aperture drilled hole after the anchor rod is installed.
Further, when the resin anchoring agent is adopted, prestress is applied to the anchor rod through a prestress applying device; the prestress applying device comprises a pull rod and a rotary sleeve, wherein the pull rod and the rotary sleeve are arranged in the diameter-expanding drill hole, the rotary sleeve is sleeved on the pull rod, the first end of the pull rod is connected with the outer end of the anchor rod body, the second end of the pull rod is connected with the moving end of a jack, the moving end of the jack is arranged outside the diameter-expanding drill hole, the first end of the rotary sleeve is sleeved on the lock nut, and the second end of the rotary sleeve is connected with; during operation, namely after the step (3), applying tension to the anchor rod through a jack and a pull rod of the prestress applying device, and enabling the outer anchoring end of the anchor rod to generate certain outward displacement; meanwhile, the rotary sleeve continuously rotates to enable the locking nut to gradually move towards the inner side of the anchor rod and realize fastening
Furthermore, grouting is carried out through a grouting device besides the supporting method, the grouting device comprises a grouting pipe and a closed bag fixedly arranged on the grouting pipe, the closed bag blocks the expanded borehole, and a grouting hole is formed in a space, located in the expanded borehole, between the closed bag and the locking nut, of the grouting pipe; when the device works, the closed bag is pressurized to be tightly attached to the expanded drill hole; then injecting grout through a grouting pipe, wherein the grout enters the small-aperture drill hole through the expanded drill hole, fills rock body cracks around the small-aperture drill hole and anchors the anchor rod in the small-aperture drill hole; and finally, the pressure of the closed bag is removed, and the grouting device is taken out.
Furthermore, in order to prevent the damage to the surrounding rock of the internal extension tunnel during blasting excavation and further influence the supporting effect of the anchor rod, after the step (2), a water jet device is inserted into the bottom of the hole-expanding drill hole and comprises a tee joint connected with the end of the water pipe, one end of the tee joint is connected with the end of the water pipe, outlets at the other two ends of the tee joint are perpendicular to the axial lead of the hole-expanding drill hole, and when the support method is used, water injected into the water pipe is ejected from the outlets at the two ends so as to manufacture a pre-crack at the position of the excavation contour line of the extension tunnel; the pre-cracking can reduce the damage degree of blasting to the expanded tunnel surrounding rock inside the locking nut, so that the effective anchoring of the outer anchoring end of the anchor rod is ensured.
The invention has the following advantages:
1. the mode of firstly excavating and then supporting in the prior tunnel construction is broken through, the space of the in-situ tunnel is utilized for pre-supporting, and the deformation of the surrounding rock can be controlled to the maximum extent;
2. the outer anchoring end and the anchoring nut of the anchor rod are directly arranged at the contour line position of the newly-built tunnel in the surrounding rock, so that the excavation construction of the newly-built tunnel is not interfered, the outer anchoring end is prevented from being damaged by the excavation construction of the newly-built tunnel, and the surrounding rock of the tunnel can be effectively supported and expanded in advance.
Description of the drawings:
figure 1 is a general schematic view of the present invention used to extend a tunnel support;
FIG. 2 is a schematic view of the drilling of a hole according to the present invention;
FIG. 3 is a schematic view of the anchor rod of the present invention in a drilled hole installation;
FIG. 4 is a schematic view of a grouting apparatus according to the present invention;
FIG. 5 is a schematic view of the pre-crack construction of the present invention;
FIG. 6 is a schematic illustration of the prestressing application of the present invention;
FIG. 7 is a schematic view of the construction of the jack in connection with the mooring body;
1-lining of in-situ tunnel; 2-expanding an excavation contour line of the tunnel; 3, pre-excavating rock mass; 4-expanding tunnel surrounding rocks; 5-drilling with small aperture; 6-expanding the hole; 7-the anchor rod body; 8-an anchoring agent; 9-outer anchoring end; 10-grouting pipe; 11-slurry outlet holes; 12-a closed capsule; 13-a pressurized line; 14-a water jet device; 15-pre-cracking; 16-a jack; 17-a pull rod; 18-a rotating sleeve; 19-locking nut, 1901-circular ring sheet, 1902-nut, 20-internal thread hole, 21-jack moving end, 22-internal hexagonal hole.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The preset internal anchor rod structure for the tunnel in-situ extension project comprises an expanded bore 6 drilled between an in-situ tunnel and an extension tunnel contour line and a small-aperture bore 5 drilled in the depth of surrounding rocks outside the extension tunnel contour line, wherein an anchor rod body 7 penetrates through the small-aperture bore 5, and the anchor rod body can adopt a hollow anchor rod or a traditional anchor rod; the outer anchoring end 9 of the anchor rod body extends out of the small-bore hole and is provided with a locking nut 19 (the locking nut 19 comprises a circular ring piece 1901 and a nut 1902 fixed on one side of the circular ring piece), a pull rod 17 and a rotary sleeve 18 sleeved on the pull rod are arranged in the diameter-expanding hole 6, the first end of the pull rod 17 is connected with the outer end of the anchor rod body 7, the second end of the pull rod 17 is connected with the moving end of a jack 16 arranged outside the diameter-expanding hole, the first end of the rotary sleeve 18 is sleeved on the locking nut 19, and the second end of the locking nut 19 is connected with the jack 16, so that the locking nut is driven by the rotation of the rotary sleeve to move towards the inner end of the anchor rod body and the jack pulls the anchor rod body outwards, and the anchor rod body positioned in.
Before the newly-built tunnel is excavated, an anchor rod is installed to a surrounding rock drill hole through an in-situ tunnel so as to play a supporting role at the moment of newly-built tunnel excavation, the anchor rod body is fixed in the deep position of the surrounding rock through an anchoring agent, and the outer anchoring end of the anchor rod is arranged at the excavation contour line position of the newly-built tunnel in the surrounding rock; when the layout of the anchor rods is designed, according to the layout of the excavation contour line of the newly-built tunnel, the pre-support anchor rods are ensured to be uniformly distributed at the excavation contour line of the newly-built tunnel, and the anchor rods are basically perpendicular to the excavation contour line of the newly-built tunnel.
An anchoring agent 8 is arranged between the small-aperture drill hole 5 and the anchor rod body 7; the anchoring agent can be resin anchoring agent or mortar anchoring agent, and can be directly coated on the small-aperture drill hole 5 or made into a flaky roll and then plugged into the small-aperture drill hole 5; the first end of the pull rod 17 is provided with an internal threaded hole channel 20, and the internal threaded hole channel 20 is in threaded connection with the external thread of the anchoring end outside the anchor rod body; the second end of the pull rod 17 is in threaded connection with the moving end 21 of the jack, the threaded connection can be realized by that the second end of the pull rod 17 is provided with external threads and is in threaded connection with an internal threaded hole of the moving end 21 of the jack, the first end of the rotating sleeve is provided with an inner hexagonal hole 22 matched with the locking nut, and the second end of the rotating sleeve is arranged on top of the shell of the jack; when the jack moving end 21 contracts relative to the jack housing, the rotating sleeve rotates to drive the locking nut to move towards the inner end of the anchor rod body and the jack moving end 21 pulls the anchor rod body 7 to be pulled outwards.
After the pull rod, the rotary sleeve and the jack are removed, a grouting device is placed in the expanded bore hole, the grouting device comprises a grouting pipe 10 and a closed bag 12 fixedly arranged on the grouting pipe, the closed bag is annularly wrapped around the grouting pipe, the closed bag blocks the expanded bore hole 6, a grouting hole 11 is formed in a space between the closed bag and a lock nut in the expanded bore hole of the grouting pipe, and the closed bag 12 can be connected with a pressurizing pipeline 13 connected with an air compressor so as to drive the closed bag 12 to expand to block the expanded bore hole 6 when the air compressor works. The small-aperture drilling hole is positioned in the deep surrounding rock and has a narrow space, so that the traditional in-hole grout stopping device cannot be arranged, and the device overcomes the problem by sealing outside the hole.
The invention relates to a support method of a preset internal anchor rod structure for a tunnel in-situ extension project, which comprises the following steps: 1) drilling small-aperture drill holes outwards on the lining of the in-situ tunnel, wherein the small-aperture drill holes extend from the original tunnel lining to the depth of surrounding rocks outside the contour line of the expanded tunnel; 2) constructing an expanded borehole at the position of the lining borehole of the in-situ tunnel, wherein the expanded borehole extends from the original tunnel lining to the contour line of the expanded tunnel, and the diameter of the expanded borehole is slightly larger than that of the anchor head outside the anchor rod; 3) the anchor rod is anchored in the small-bore hole through the anchoring agent, and the outer end of the anchor rod is fixed at the bottom end of the expanded-bore hole through the locking nut.
When the anchoring agent is a resin anchoring agent, firstly, a chemical coil of the resin anchoring agent is placed in a small-aperture drill hole, and then the anchor rod is rotationally drilled through a drilling machine, so that one end of the anchor rod is anchored in the small-aperture drill hole; the anchoring agent is required to be ensured not to overflow out of the small-aperture drilled hole after the anchor rod is installed.
When the resin anchoring agent is adopted, prestress is applied to the anchor rod through a prestress applying device; the prestress applying device comprises a pull rod and a rotary sleeve, wherein the pull rod and the rotary sleeve are arranged in the diameter-expanding drill hole, the rotary sleeve is sleeved on the pull rod, the first end of the pull rod is connected with the outer end of the anchor rod body, the second end of the pull rod is connected with the moving end of a jack, the moving end of the jack is arranged outside the diameter-expanding drill hole, the first end of the rotary sleeve is sleeved on the lock nut, and the second end of the rotary sleeve is connected with; during operation, namely after the step (3), applying tension to the anchor rod through a jack and a pull rod of the prestress applying device, and enabling the outer anchoring end of the anchor rod to generate certain outward displacement; meanwhile, the rotary sleeve continuously rotates to enable the locking nut to gradually move towards the inner side of the anchor rod and realize fastening
The supporting method can also be used for grouting through a grouting device, the grouting device comprises a grouting pipe and a closed bag fixedly arranged on the grouting pipe, the closed bag blocks the expanded borehole, and a grouting hole is formed in a space between the closed bag and the locking nut in the expanded borehole of the grouting pipe; when the device works, the closed bag is pressurized to be tightly attached to the expanded drill hole; then injecting grout through a grouting pipe, wherein the grout enters the small-aperture drill hole through the expanded drill hole, fills rock body cracks around the small-aperture drill hole and anchors the anchor rod in the small-aperture drill hole; and finally, the pressure of the closed bag is removed, and the grouting device is taken out.
Furthermore, in order to prevent damage to surrounding rocks of the internal extension tunnel during blasting excavation and further influence the supporting effect of the anchor rod, after the step (2), a water jet device is inserted into the bottom of the hole-expanding drill hole and comprises a tee joint connected with the end of the water pipe, one end of the tee joint is connected with the end of the water pipe, outlets at the other two ends of the tee joint are perpendicular to the axial lead of the hole-expanding drill hole, and when the support method is used, water injected into the water pipe is ejected from the outlets at the two ends so as to manufacture pre-cracks at the position of the excavation contour line of the extension tunnel; the pre-cracking can reduce the damage degree of blasting to the expanded tunnel surrounding rock inside the locking nut, so that the effective anchoring of the outer anchoring end of the anchor rod is ensured.
The invention has the following advantages:
1. the mode of firstly excavating and then supporting in the prior tunnel construction is broken through, the space of the in-situ tunnel is utilized for pre-supporting, and the deformation of the surrounding rock can be controlled to the maximum extent;
2. the outer anchoring end and the anchoring nut of the anchor rod are directly arranged at the contour line position of the newly-built tunnel in the surrounding rock, so that the excavation construction of the newly-built tunnel is not interfered, the outer anchoring end is prevented from being damaged by the excavation construction of the newly-built tunnel, and the surrounding rock of the tunnel can be effectively supported and expanded in advance.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a predetermine inside stock structure for tunnel normal position enlargement engineering which characterized in that: the method comprises the steps of drilling an expanded diameter drilling hole between an in-situ tunnel and an expanded tunnel contour line and drilling a small-aperture drilling hole deep in surrounding rocks outside the expanded tunnel contour line, wherein an anchor rod body penetrates through the small-aperture drilling hole, the outer anchoring end of the anchor rod body extends out of the small-aperture drilling hole and is provided with a locking nut, the outer anchoring end of the anchor rod is arranged at the excavation contour line position of a newly-built tunnel inside the surrounding rocks, and an anchoring agent is arranged between the small-aperture drilling hole and the anchor rod body.
2. The preset internal anchor rod structure for tunnel in-situ enlargement project according to claim 1, characterized in that: a pull rod and a rotary sleeve sleeved on the pull rod are arranged in the diameter-expanded drill hole, the first end of the pull rod is connected with the outer end of the anchor rod body, the second end of the pull rod is connected with the moving end of a jack arranged outside the diameter-expanded drill hole, the first end of the rotary sleeve is sleeved on a locking nut, and the second end of the rotary sleeve is connected with the jack so as to drive the locking nut to move towards the inner end of the anchor rod body and pull the anchor rod body outwards by the jack in a rotating mode, so that the anchor rod body in the small-bore drill hole generates prestress; the first end of the pull rod is provided with an internal threaded hole channel which is in threaded connection with the external thread of the anchoring end outside the anchor rod body; and the second end of the pull rod is in threaded connection with the moving end of the jack.
3. The preset internal anchor rod structure for tunnel in-situ enlargement work according to claim 1 or 2, wherein: the first end of the rotating sleeve is provided with an inner hexagonal hole matched with the locking nut, and the second end of the rotating sleeve is arranged on top of the jack shell.
4. The preset internal anchor rod structure for tunnel in-situ enlargement project according to claim 1, characterized in that: the locking nut comprises a circular ring-shaped sheet and a nut fixed on one side face of the circular ring-shaped sheet.
5. The preset internal anchor rod structure for tunnel in-situ enlargement project according to claim 1, characterized in that: and after the pull rod, the rotary sleeve and the jack are removed, a grouting device is placed in the hole expanding drill hole and comprises a grouting pipe and a sealing bag fixedly arranged on the grouting pipe, the sealing bag blocks the hole expanding drill hole, and a grouting hole is formed in a space between the sealing bag and the locking nut in the hole expanding drill hole of the grouting pipe.
6. A supporting method of a preset internal anchor rod structure for a tunnel in-situ extension project is characterized by comprising the following steps: the supporting method comprises the following steps: 1) drilling small-aperture drill holes outwards on the lining of the in-situ tunnel, wherein the small-aperture drill holes extend from the original tunnel lining to the depth of surrounding rocks outside the contour line of the expanded tunnel; 2) constructing an expanded borehole at the position of the lining borehole of the in-situ tunnel, wherein the expanded borehole extends from the original tunnel lining to the contour line of the expanded tunnel, and the diameter of the expanded borehole is slightly larger than that of the anchor head outside the anchor rod; 3) the anchor rod is anchored in the small-bore hole through the anchoring agent, and the outer end of the anchor rod is fixed at the bottom end of the expanded-bore hole through the locking nut.
7. The method for supporting the preset internal anchor rod structure for the tunnel in-situ extension project according to claim 6, wherein: when the anchoring agent is a resin anchoring agent, firstly, a chemical coil of the resin anchoring agent is placed in a small-aperture drill hole, and then the anchor rod is rotationally drilled through a drilling machine, so that one end of the anchor rod is anchored in the small-aperture drill hole; the anchoring agent is required to be ensured not to overflow out of the small-aperture drilled hole after the anchor rod is installed.
8. The method for supporting the preset internal anchor rod structure for the tunnel in-situ extension project according to claim 6, wherein: when the resin anchoring agent is adopted, prestress is applied to the anchor rod through a prestress applying device; the prestress applying device comprises a pull rod and a rotary sleeve, wherein the pull rod and the rotary sleeve are arranged in the diameter-expanding drill hole, the rotary sleeve is sleeved on the pull rod, the first end of the pull rod is connected with the outer end of the anchor rod body, the second end of the pull rod is connected with the moving end of a jack, the moving end of the jack is arranged outside the diameter-expanding drill hole, the first end of the rotary sleeve is sleeved on the lock nut, and the second end of the rotary sleeve is connected with; during operation, namely after the step (3), applying tension to the anchor rod through a jack and a pull rod of the prestress applying device, and enabling the outer anchoring end of the anchor rod to generate certain outward displacement; meanwhile, the locking nut is gradually moved towards the inner side of the anchor rod through continuous rotation of the rotary sleeve, and fastening is realized.
9. The method for supporting the preset internal anchor rod structure for the tunnel in-situ extension project according to claim 6, wherein: the supporting method is characterized in that grouting is carried out through a grouting device, the grouting device comprises a grouting pipe and a sealing bag fixedly arranged on the grouting pipe, the sealing bag blocks an expanded borehole, and a grouting hole is formed in a space between the sealing bag and a locking nut in the expanded borehole of the grouting pipe; when the device works, the closed bag is pressurized to be tightly attached to the expanded drill hole; then injecting grout through a grouting pipe, wherein the grout enters the small-aperture drill hole through the expanded drill hole, fills rock body cracks around the small-aperture drill hole and anchors the anchor rod in the small-aperture drill hole; and finally, the pressure of the closed bag is removed, and the grouting device is taken out.
10. The method for supporting the preset internal anchor rod structure for the tunnel in-situ extension project according to claim 6, wherein: in addition to the supporting method, in order to prevent damage to surrounding rocks of the internal expanded tunnel during blasting excavation and further influence the supporting effect of the anchor rod, after the step (2), a water jet device is inserted into the bottom of the expanded bore hole and comprises a tee joint connected with the end of a water pipe, one end of the tee joint is connected with the end of the water pipe, outlets at the other two ends of the tee joint are perpendicular to the axial lead of the expanded bore hole, and when the supporting method is used, water injected into the water pipe is ejected from the outlets at the two ends so as to manufacture a pre-crack at the position of an excavation contour line of the expanded tunnel; the pre-cracking can reduce the damage degree of blasting to the expanded tunnel surrounding rock inside the locking nut, so that the effective anchoring of the outer anchoring end of the anchor rod is ensured.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110054312.0A CN112539075A (en) | 2021-01-15 | 2021-01-15 | Preset internal anchor rod structure for tunnel in-situ extension project and supporting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110054312.0A CN112539075A (en) | 2021-01-15 | 2021-01-15 | Preset internal anchor rod structure for tunnel in-situ extension project and supporting method thereof |
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| CN112539075A true CN112539075A (en) | 2021-03-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047878A (en) * | 2021-04-15 | 2021-06-29 | 山东理工大学 | Unloading, anchoring and buffering regulation and control method for underground engineering dynamic disaster |
| CN113137257A (en) * | 2021-04-08 | 2021-07-20 | 苏州中车建设工程有限公司 | Treatment structure for transfinite convergence deformation in shield tunnel operation period and construction method thereof |
| WO2022151774A1 (en) * | 2021-01-15 | 2022-07-21 | 福州大学 | Pre-set internal anchor cable support method used for tunnel in-situ expansion engineering projects |
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| WO2022151774A1 (en) * | 2021-01-15 | 2022-07-21 | 福州大学 | Pre-set internal anchor cable support method used for tunnel in-situ expansion engineering projects |
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| CN116220733A (en) * | 2023-05-08 | 2023-06-06 | 济南轨道交通集团有限公司 | Internal anchoring combined protection technology for lower existing tunnel under top unloading |
| CN116220733B (en) * | 2023-05-08 | 2023-08-18 | 济南轨道交通集团有限公司 | Internal anchoring combined protection technology for lower existing tunnel under top unloading |
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