CN108979685B - Construction method for supporting broken rock stratum of mine by adopting prestress component anchor rod - Google Patents
Construction method for supporting broken rock stratum of mine by adopting prestress component anchor rod Download PDFInfo
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- CN108979685B CN108979685B CN201810914666.6A CN201810914666A CN108979685B CN 108979685 B CN108979685 B CN 108979685B CN 201810914666 A CN201810914666 A CN 201810914666A CN 108979685 B CN108979685 B CN 108979685B
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 77
- 239000011435 rock Substances 0.000 title claims abstract description 43
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000004873 anchoring Methods 0.000 claims abstract description 14
- 238000005553 drilling Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 238000011900 installation process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000005641 tunneling Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 5
- 239000011440 grout Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- KRQUFUKTQHISJB-YYADALCUSA-N 2-[(E)-N-[2-(4-chlorophenoxy)propoxy]-C-propylcarbonimidoyl]-3-hydroxy-5-(thian-3-yl)cyclohex-2-en-1-one Chemical compound CCC\C(=N/OCC(C)OC1=CC=C(Cl)C=C1)C1=C(O)CC(CC1=O)C1CCCSC1 KRQUFUKTQHISJB-YYADALCUSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 125000003003 spiro group Chemical group 0.000 description 1
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Classifications
-
- 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
-
- 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
-
- 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
The invention relates to a construction method for supporting broken rock stratum of a mine by adopting a prestressed component anchor rod, which comprises the following steps: drilling a supporting hole in a broken rock stratum of a mine; after the drilling is finished, cleaning residual rock blocks in the support holes; uniformly stirring a resin anchoring agent arranged on the anchor head of the anchor rod of the prestress member, and plugging the anchor rod into the supporting hole to fix the upper end of the anchor rod of the prestress member; pulling down the prestress component anchor rod to enable the upper supporting device to be unfolded and complete self-locking, and enabling the lower rotary lifting supporting device to be unfolded; a tray for supporting the rock wall outside the supporting hole is arranged at the lower part of the prestress component anchor rod; grouting into the support hole through a primary grouting pipe which is arranged on the prestress component anchor rod and the outlet of which is communicated with the upper part of the prestress component anchor rod; and performing secondary grouting through a secondary grouting pipe arranged on the prestress component anchor rod. The construction method is beneficial to solving the construction safety problems of ledge, roof fall and the like of surrounding rock in the tunneling process in the chamber and tunnel rock stratum compared with broken positions.
Description
Technical Field
The invention relates to a construction method for supporting broken rock strata of a mine by adopting a prestressed component anchor rod, which is suitable for the construction field of supporting engineering such as a cave entrance, a tunnel and the like.
Background
Collapse and caving are extremely easy to occur in the construction process of the cave opening broken belt; the construction safety environment is poor; the requirements on the supporting quality of the tunnel opening are high, and the bearing capacity is high. The current common construction method is a grouting filling method for treating the broken belt, and has high cost, poor effect and low construction speed. The anchor bolt support is used as an effective accurate roadway support mode, the stability of surrounding rock can be obviously improved due to the strengthening effect on the strength of the surrounding rock of the roadway, and the anchor bolt support has the advantages of low support cost, high roadway forming speed, low labor intensity, high roadway section utilization rate, simplified stope end maintenance process, obvious improvement of operation environment and safe production conditions and the like, can improve the economic benefit of a mine, is more and more widely used, thus being a main support form of the mine roadway of a coal mine enterprise, and representing the main development direction of the coal mine roadway support technology. However, the anchor bolt support is adopted, and has the defects that the anchor bolt support belongs to recessive support, the monitoring and the detection of the support quality and the reliability are not easy, roof fall accidents without obvious aura sometimes occur, in addition, the support effect is not easy to ensure for the stoping roadway of the roadway with large deformation of soft rock and large plasticity, and the roadway cannot be used.
Disclosure of Invention
The invention aims to provide a construction method for supporting broken rock stratum of a mine by adopting a prestressed component anchor rod, which is beneficial to solving construction safety problems such as ledge and roof fall of surrounding rock in the tunneling process of a chamber and a tunnel rock stratum compared with broken positions.
The technical scheme of the invention is as follows: a construction method for supporting broken rock stratum of mine by adopting a prestress component anchor rod comprises the following steps:
1) Drilling: drilling a supporting hole in a broken rock stratum of a mine;
2) Hole cleaning: after the drilling is finished, cleaning residual rock blocks in the support holes;
3) Installing a prestress component anchor rod: uniformly stirring a resin anchoring agent arranged on the anchor head of the prestress member anchor rod, and then plugging the anchor rod into the supporting hole to fix the upper end of the prestress member anchor rod, so as to ensure that the prestress member anchor rod is firmly anchored;
4) And (3) construction of an anchoring end: after the resin anchoring agent is fastened, the prestress component anchor rod is pulled down to enable the upper supporting device arranged on the prestress component anchor rod to be unfolded and complete self-locking, and the lower rotary lifting supporting device arranged on the prestress component anchor rod is enabled to be unfolded through the nut rotating mechanism;
5) And (3) tray installation: a tray for supporting the rock wall outside the supporting hole is arranged at the lower part of the prestress component anchor rod;
6) Primary grouting: grouting into the supporting hole through a primary grouting pipe which is arranged on the prestress component anchor rod and the outlet of which is communicated with the upper part of the prestress component anchor rod, and grouting from top to bottom, wherein the grouting is not filled into the supporting hole as a full standard;
7) And (3) secondary grouting: and 2-3 days after primary grouting, performing secondary grouting through a secondary grouting pipe arranged on the prestress component anchor rod.
Furthermore, in the step 2), a high-pressure water gun is adopted to clean residual rock in the drilled hole, and the condition that no rock in the middle of the drilled hole blocks the drilled hole is used as a standard.
Further, prestressing force component stock includes the screw rod, the upper end of screw rod is provided with the anchor head, the outside parcel of anchor head has the resin anchor of encapsulation in the bag body, and the downside that is located the anchor head on the screw rod is provided with the upper portion strutting arrangement of screw rod pull-down back expansion and block the supporting hole lateral wall, be provided with prestressing force adjusting device on the shaft of screw rod, the lower part of screw rod is provided with the lower part of expanding the back and block supporting hole lateral wall and rise strutting arrangement soon, the tray cover is arranged in on the screw rod and is located the downside of lower part and rise strutting arrangement soon, the downside cover that is located the tray on the screw rod has put and has blocked the thick liquid stopper and the spiro union has lock nut, the both sides portion of screw rod corresponds and is provided with primary grouting pipe and the secondary grouting pipe that the grout outlet is located screw rod upper portion respectively, the other end of primary grouting pipe and secondary grouting pipe is worn out by the tray respectively.
Further, the anchor head includes the anchor head cover, be provided with the vertical blind hole from bottom to top in the anchor head cover, the front and back lateral wall of vertical blind hole is provided with vertical blind hole respectively, and the both sides wall of vertical blind hole just is located the downside of vertical blind hole and is provided with horizontal through-hole, be provided with the connecting rod that is used for being connected with the screw rod upper end in the vertical blind hole, the upper end of connecting rod is connected with the top of vertical blind hole through the spring, and the front and back side of connecting rod is provided with upper portion spring knock pin respectively, and the both sides portion of connecting rod just is located the downside of upper portion spring knock pin and is provided with the lower part spring knock pin.
Further, the upper supporting device comprises a hinging seat fixedly connected with the lower end of the anchor head and used for a screw rod to penetrate through, a plurality of connecting rods are hinged to the periphery of the hinging seat at intervals, a fixing seat is fixedly arranged on the upper portion of the screw rod and located on the lower side of the hinging seat, an upper supporting rod is correspondingly hinged to the lower side of the connecting rod on the fixing seat, and the other end of the connecting rod is hinged to the middle of the upper supporting rod.
Further, the prestress component adjusting device comprises an upper fixing plate which is in threaded connection with the upper portion of the screw, a plurality of prestress steel strands are fixed on the periphery of the upper fixing plate at intervals, a lower fixing plate is in threaded connection with the lower portion of the screw, a plurality of bolts which are arranged from bottom to top are in threaded connection with the periphery of the lower fixing plate at intervals, and the bolts are welded with the lower ends of the corresponding prestress steel strands.
Further, in the step 3), before installation, it is checked whether the prestressed steel strand is firm, and at the same time, the prestressing force is applied, so as to ensure that the prestressed steel strand is prestressed.
Further, two sides of the upper fixing piece and the lower fixing piece are respectively provided with a vertical through hole, the upper ends of the primary grouting pipe and the secondary grouting pipe respectively penetrate through the corresponding vertical through holes on the upper fixing piece and are fixed on the screw rod through the buckle, and the same ends of the primary grouting pipe and the secondary grouting pipe respectively penetrate through the corresponding vertical through holes on the lower fixing piece and penetrate out of the through holes in the middle of the tray; the other end parts of the primary grouting pipe and the secondary grouting pipe are exposed outside in the installation process of the tray.
Further, the lower portion screwing support device comprises an upper fixing plate connected with the lower portion of the screw rod, lower support rods are hinged to the periphery of the upper fixing plate at intervals, the lower fixing plate is sleeved on the lower side of the upper fixing plate on the screw rod, screwing nuts for driving the lower fixing plate to lift are screwed on the screw rod, and support rods with the upper ends hinged to the middle portions of the lower support rods are correspondingly hinged to the periphery of the lower fixing plate.
Further, the nut rotating mechanism in the step 4) comprises a sleeve which is sleeved on the screw, an inner hexagonal hole matched with the screwing nut is formed in the upper end of the sleeve, a bearing is welded in the middle of the sleeve, and an outer hexagonal structure used for being connected with a spanner is arranged at the lower end of the sleeve.
Compared with the prior art, the invention has the following advantages: the construction method for supporting the broken rock stratum of the mine by adopting the prestress component anchor rod ensures that the operation safety problems of chamber and tunnel rock stratum are loosened, broken, easy to collapse, and the like are basically controlled, thereby being beneficial to effectively solving the construction safety problems of ledge, roof fall, and the like of surrounding rock at the broken position in the tunneling process of the chamber and tunnel rock stratum; the method has the advantages of high practicality, high construction stability and safety, high construction efficiency and remarkable supporting effect.
Drawings
FIG. 1 is a schematic view of the construction of the pre-stressing member bolt of the present invention;
FIG. 2 is a schematic view of the structure of the anchor head of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2 in accordance with the present invention;
FIG. 4 is a schematic view of the construction of the upper support device of the present invention;
FIG. 5 is a schematic diagram of the prestress adjusting device of the invention;
FIG. 6 is a B-B cross-sectional view of FIG. 5 in accordance with the present invention;
FIG. 7 is a schematic view of the lower swing-up support apparatus of the present invention;
fig. 8 is a schematic structural view of a nut rotating mechanism according to the present invention.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Referring to fig. 1 to 8
A construction method for supporting broken rock stratum of mine by adopting a prestress component anchor rod comprises the following steps:
1) Drilling: drilling supporting holes in broken rock stratum of the mine by using common drilling equipment of the mine;
2) Hole cleaning: after the drilling is finished, cleaning residual rock blocks in the support holes;
3) Installing a prestress component anchor rod: uniformly stirring a resin anchoring agent arranged on the anchor head of the prestress member anchor rod, and then plugging the anchor rod into the supporting hole to fix the upper end of the prestress member anchor rod, so as to ensure that the prestress member anchor rod is firmly anchored;
4) And (3) construction of an anchoring end: after the resin anchoring agent is fastened, the prestress component anchor rod is pulled down, a self-locking mechanism in an anchor head is clamped into a clamping groove, an upper supporting device arranged on the prestress component anchor rod is unfolded and self-locking is realized under the action of gravity, and a lower screwing supporting device arranged on the prestress component anchor rod is unfolded and supported on the side wall of a supporting hole through a nut screwing mechanism;
5) And (3) tray installation: a tray for supporting the rock wall outside the supporting hole is arranged at the lower part of the prestress component anchor rod;
6) Primary grouting: after the tray is installed, the whole anchoring body is stretched, grouting can be performed immediately, grouting is performed to the support hole through a primary grouting pipe which is arranged on the prestress component anchor rod and the outlet of the primary grouting pipe is communicated with the upper part of the prestress component anchor rod, and grouting is performed downwards from top to bottom, so that the grouting is not performed as a full filling standard;
7) And (3) secondary grouting: and 2-3 days after primary grouting, performing secondary grouting through a secondary grouting pipe arranged on the prestress component anchor rod, wherein a grouting outlet of the secondary grouting pipe is arranged at the upper end of the screw rod, and an upper supporting device at the upper end is ensured to form a positive umbrella-shaped body through secondary grouting.
In this embodiment, in the step 2), a high-pressure water gun is used to clean residual rock in the drilled hole, and the drill hole is standard in the middle of the drilled hole without blocking the drilled hole by the rock.
In this embodiment, the prestress member anchor rod comprises a screw rod 10, the upper end of the screw rod is provided with an anchor head 20, the outer side of the anchor head is wrapped with a resin anchoring agent 22 encapsulated in a bag body, the lower side of the screw rod on the anchor head is provided with an upper supporting device 30 which is stretched after being pulled down and clamps the side wall of a supporting hole, the shaft of the screw rod is provided with a prestress adjusting device, the lower part of the screw rod is provided with a lower screwing supporting device 50 which is stretched and clamps the side wall of the supporting hole, the tray 60 is sleeved on the screw rod and is positioned at the lower side of the lower screwing supporting device, the lower side of the tray on the screw rod is sleeved with a grout stop 71, a gasket 72 and a locking nut 73, so that the hole on the tray is blocked by the grout stop, and the locking of the grout stop is completed by the locking nut. The two sides of the screw are correspondingly provided with a primary grouting pipe 11 and a secondary grouting pipe 12, the grouting outlets of which are respectively positioned at the upper part of the screw, and the other ends of the primary grouting pipe and the secondary grouting pipe respectively penetrate out of the tray so as to finish the grouting process through the primary grouting pipe and the secondary grouting pipe.
In this embodiment, the anchor head includes anchor head cover 21, be provided with the vertical blind hole 211 from bottom to top in the anchor head cover, the front and back lateral wall of vertical blind hole is provided with vertical blind hole 212 respectively, and the both sides wall of vertical blind hole just is located the downside of vertical blind hole and is provided with horizontal through-hole 213, be provided with the connecting rod 23 that is used for being connected with the screw rod upper end in the vertical blind hole, the upper end of connecting rod is connected with the top of vertical blind hole through spring 24, and the front and back side of connecting rod is provided with upper portion spring knock pin 231 respectively, and the both sides portion of connecting rod just is located the downside of upper portion spring knock pin and is provided with lower part spring knock pin 232 to when the screw rod is pulled down, make upper portion spring knock pin card go into in the vertical blind hole, lower part spring knock pin card goes into horizontal through-hole, and then accomplishes the auto-lock after making upper portion strutting arrangement expand.
In this embodiment, the upper spring top pin and the lower spring top pin respectively include springs 233 disposed in the connecting rod, and two ends of the springs are respectively connected with a cylindrical chuck.
In this embodiment, the upper supporting device includes a hinge seat 31 fixedly connected with the lower end of the anchor head and used for passing through a screw rod or a connecting rod, a plurality of connecting rods 32 are hinged at intervals on the periphery of the hinge seat, a fixing seat 33 is fixed on the upper portion of the screw rod and located on the lower side of the hinge seat, upper supporting rods 34 are correspondingly hinged on the lower side of the connecting rod on the fixing seat, the number of the upper supporting rods is four, and the other ends of the connecting rods are hinged with the middle part of the upper supporting rods. The upper supporting device forms a reverse umbrella type supporting frame by pulling down the screw rod, and the lower the rod is under the action of self gravity, the more the rod is pulled down, the more the rod is fastened.
In this embodiment, the prestress adjusting device includes an upper fixing plate 41 screwed to an upper portion of the screw, a plurality of prestress strands 42 are fixed at intervals on a peripheral portion of the upper fixing plate, a lower fixing plate 43 is screwed to a lower portion of the screw, a plurality of bolts 44 disposed from bottom to top are screwed to a peripheral portion of the lower fixing plate at intervals, and the bolts are welded or hinged to lower ends of the corresponding prestress strands, so that tension of the prestress strands is adjusted by rotating the bolts.
In this embodiment, the number of the prestressed steel strands is 3 and the prestressed steel strands are distributed at intervals of 120 °, so that the prestressed steel strands, the screw and the slurry form a whole after grouting is completed, and the anchoring strength is further improved. In the step 3), before installation, whether the prestress steel strand is firm or not is checked, and meanwhile, the prestress is applied, so that the prestress steel strand is ensured to be loaded with the prestress.
In this embodiment, two sides of the upper fixing piece and the lower fixing piece are respectively provided with a vertical through hole 45, the upper ends of the primary grouting pipe and the secondary grouting pipe respectively pass through corresponding vertical through holes on the upper fixing piece and are fixed on the screw rod through the buckle 13, and the same ends of the primary grouting pipe and the secondary grouting pipe respectively pass through corresponding vertical through holes on the lower fixing piece and pass through a through hole gap used for the screw rod to pass through in the middle of the tray; the other end parts of the primary grouting pipe and the secondary grouting pipe are exposed outside in the installation process of the tray so as to facilitate later grouting.
In this embodiment, the lower portion screwing support device includes an upper fixing plate 51 connected to the lower portion of the screw, four lower support rods 52 are hinged to the peripheral portion of the upper fixing plate at intervals, a lower fixing plate 53 is sleeved on the lower side of the upper fixing plate on the screw, a screwing nut 54 driving the lower fixing plate to lift is screwed on the screw, four support rods 55 with upper ends hinged to the middle portion of the lower support rod are hinged to the peripheral portion of the lower fixing plate correspondingly, so that the lower support rod is unfolded and clamped on the side wall of the support hole after the screwing nut is rotated upwards. In use, the number of turns of the lifting nut can be rotated to know whether the bottom end structure is opened to a proper position.
In this embodiment, the upper fixing plate includes an upper fixing nut 511 screwed with a screw, a connecting plate 512 hinged to the lower supporting rod is sleeved on the lower side of the upper fixing nut on the screw, four lower supporting rods are hinged to the connecting plate at intervals, and the lower side of the connecting plate on the screw is screwed with the lower fixing nut 513, so that the positioning of the connecting plate is realized, and the position of the lower spiral lifting supporting device can be adjusted according to the specific depth of the supporting hole. The other end of the lower support rod is provided with a suction disc 56 for better suction at the side wall of the support hole.
In this embodiment, the nut rotating mechanism in the step 4) includes a sleeve 81 that is sleeved on the screw from bottom to top in use, an inner hexagonal hole 82 that is matched with the screwing nut is provided at the upper end of the sleeve, a bearing 83 is welded at the middle part of the sleeve, and an outer hexagonal structure 84 (as shown in fig. 8) that is connected with the wrench is provided at the lower end of the sleeve, so that the screwing nut is screwed up by the wrench or the sleeve, and the sleeve can be detached after the support rod is unfolded.
The foregoing is only illustrative of the preferred embodiments of the present invention, and it will be apparent to those skilled in the art from this disclosure that, while designing a different form of construction method for supporting a mine fracture formation using prestressed member anchors, the invention is not limited to the details of construction method, but is intended to cover all equivalent changes, modifications, substitutions and alterations herein without departing from the spirit and scope of the invention.
Claims (8)
1. The construction method for supporting the broken rock stratum of the mine by adopting the prestress component anchor rod is characterized by comprising the following steps of:
1) Drilling: drilling a supporting hole in a broken rock stratum of a mine;
2) Hole cleaning: after the drilling is finished, cleaning residual rock blocks in the support holes;
3) Installing a prestress component anchor rod: uniformly stirring a resin anchoring agent arranged on the anchor head of the prestress member anchor rod, and then plugging the anchor rod into the supporting hole to fix the upper end of the prestress member anchor rod, so as to ensure that the prestress member anchor rod is firmly anchored;
4) And (3) construction of an anchoring end: after the resin anchoring agent is fastened, the prestress component anchor rod is pulled down to enable the upper supporting device arranged on the prestress component anchor rod to be unfolded and complete self-locking, and the lower rotary lifting supporting device arranged on the prestress component anchor rod is enabled to be unfolded through the nut rotating mechanism;
5) And (3) tray installation: a tray for supporting the rock wall outside the supporting hole is arranged at the lower part of the prestress component anchor rod;
6) Primary grouting: grouting into the supporting hole through a primary grouting pipe which is arranged on the prestress component anchor rod and the outlet of which is communicated with the upper part of the prestress component anchor rod, and grouting from top to bottom, wherein the grouting is not filled into the supporting hole as a full standard;
7) And (3) secondary grouting: 2-3 days after primary grouting, performing secondary grouting through a secondary grouting pipe arranged on the prestress component anchor rod; the prestress component anchor rod comprises a screw, an anchor head is arranged at the upper end of the screw, a resin anchoring agent encapsulated in the bag body is wrapped outside the anchor head, an upper supporting device which is positioned on the screw and is unfolded and clamped on the side wall of a supporting hole after the screw is pulled down is arranged on the lower side of the anchor head, a prestress adjusting device is arranged on the rod body of the screw, a lower rotary lifting supporting device which is clamped on the side wall of the supporting hole after being unfolded is arranged on the lower part of the screw, a tray is sleeved on the screw and is positioned on the lower side of the lower rotary lifting supporting device, a grouting stop plug is sleeved on the lower side of the tray on the screw and is in threaded connection with a locking nut, a primary grouting pipe and a secondary grouting pipe, the grouting outlets of which are respectively positioned on the upper part of the screw, are correspondingly arranged on the two sides of the screw, and the other ends of the primary grouting pipe and the secondary grouting pipe are respectively penetrated out by the tray; the prestress adjusting device comprises an upper fixing plate which is in threaded connection with the upper portion of a screw rod, a plurality of prestress steel strands are fixed on the periphery of the upper fixing plate at intervals, a lower fixing plate is in threaded connection with the lower portion of the screw rod, a plurality of bolts which are arranged from bottom to top are in threaded connection with the periphery of the lower fixing plate at intervals, and the bolts are welded with the lower ends of the corresponding prestress steel strands.
2. The method for constructing a broken rock layer in a mine by adopting the anchor rod of the prestress member according to claim 1, wherein the step 2) adopts a high-pressure water gun to clean residual rock in the drilled hole, and the condition that the drilled hole is not blocked by the rock in the middle of the drilled hole is the standard.
3. The construction method for supporting broken rock strata of mine by adopting the prestress component anchor rod according to claim 1, wherein the anchor head comprises an anchor head sleeve, vertical blind holes are formed in the anchor head sleeve from bottom to top, longitudinal blind holes are formed in the front side wall and the rear side wall of each vertical blind hole respectively, transverse through holes are formed in the two side walls of each vertical blind hole and located on the lower side of each longitudinal blind hole, a connecting rod used for being connected with the upper end of a screw rod is arranged in each vertical blind hole, the upper end of the connecting rod is connected with the top of each vertical blind hole through a spring, upper spring ejector pins are arranged on the front side and the rear side of the connecting rod respectively, and lower spring ejector pins are arranged on the two side parts of the connecting rod and located on the lower side of each upper spring ejector pin.
4. The construction method for supporting broken rock strata of mine by adopting the prestress component anchor rod as claimed in claim 1, wherein the upper supporting device comprises a hinging seat fixedly connected with the lower end of the anchor head and used for a screw rod to pass through, a plurality of connecting rods are hinged at intervals on the periphery of the hinging seat, a fixing seat is fixedly arranged on the upper part of the screw rod and positioned on the lower side of the hinging seat, an upper supporting rod is correspondingly hinged on the fixing seat and positioned on the lower side of the connecting rod, one end of the connecting rod is hinged with the hinging seat, and the other end of the connecting rod is hinged with the middle part of the upper supporting rod.
5. The method according to claim 1, wherein in step 3), before installation, the pre-stressed steel strand is inspected for firmness and pre-stress is applied to ensure that the pre-stressed steel strand is pre-stressed.
6. The construction method for supporting broken rock strata of mine by adopting the prestress member anchor rod according to claim 1 or 5, wherein the two sides of the upper fixing plate and the lower fixing plate are respectively provided with vertical through holes, the upper ends of the primary grouting pipe and the secondary grouting pipe respectively pass through the corresponding vertical through holes on the upper fixing plate and are fixed on the screw rod through buckles, and the same ends of the primary grouting pipe and the secondary grouting pipe respectively pass through the corresponding vertical through holes on the lower fixing plate and pass out of the through holes in the middle of the tray; the other end parts of the primary grouting pipe and the secondary grouting pipe are exposed outside in the installation process of the tray.
7. The construction method for supporting broken rock strata of mine by adopting the prestress component anchor rod as claimed in claim 1, wherein the lower portion screwing support device comprises an upper fixing plate connected with the lower portion of a screw rod, lower support rods are hinged to the periphery of the upper fixing plate at intervals, the lower fixing plate is sleeved on the lower side of the upper fixing plate on the screw rod, screwing nuts for driving the lower fixing plate to lift are screwed on the screw rod, and supporting rods with the upper ends hinged to the middle portions of the lower support rods are correspondingly hinged to the periphery of the lower fixing plate.
8. The construction method for supporting broken rock strata of mine by adopting the prestress member as recited in claim 7, wherein the nut rotating mechanism in the step 4) comprises a sleeve which is sleeved on the screw, an inner hexagonal hole matched with the screwing nut is arranged at the upper end of the sleeve, a bearing is welded at the middle part of the sleeve, and an outer hexagonal structure used for being connected with a spanner is arranged at the lower end of the sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109457976A (en) * | 2018-12-14 | 2019-03-12 | 中国三冶集团有限公司 | A kind of field fabrication steel strand anchoring end end onion device |
| CN110608061B (en) * | 2019-08-14 | 2024-04-05 | 四川大学 | Prestressed grouting anchor rod and installation and recovery method thereof |
| CN111379581B (en) * | 2020-03-24 | 2021-08-31 | 淮南东华欧科矿山支护设备有限责任公司 | Deep roadway prestress full-anchor support construction equipment and construction method thereof |
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| CN107780955A (en) * | 2017-12-15 | 2018-03-09 | 湖南科技大学 | A kind of controllable grouting and reinforcing device and construction method for breaking surrounding rock tunnel |
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| US5599140A (en) * | 1995-09-13 | 1997-02-04 | The Eastern Company | Mine roof support system including an expansion anchor with means assisting resin component mixing and method of installation thereof |
| CN104500115A (en) * | 2014-12-15 | 2015-04-08 | 王振伟 | Pre-stress full-length anchoring rock bolt retaining and protecting method |
| CN106523006A (en) * | 2016-11-29 | 2017-03-22 | 中铁二十三局集团第工程有限公司 | Glass fiber anchor rod and construction method |
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