CN113482681A - Device and method for reinforcing prestress grouting anchor cable of belt main roadway bottom plate - Google Patents
Device and method for reinforcing prestress grouting anchor cable of belt main roadway bottom plate Download PDFInfo
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- CN113482681A CN113482681A CN202110945402.9A CN202110945402A CN113482681A CN 113482681 A CN113482681 A CN 113482681A CN 202110945402 A CN202110945402 A CN 202110945402A CN 113482681 A CN113482681 A CN 113482681A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 51
- 238000009826 distribution Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 239000004568 cement Substances 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 23
- 238000010276 construction Methods 0.000 claims description 18
- 230000002787 reinforcement Effects 0.000 claims description 15
- 238000011835 investigation Methods 0.000 claims description 10
- 235000019353 potassium silicate Nutrition 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000012549 training Methods 0.000 claims description 3
- 229920001131 Pulp (paper) Polymers 0.000 claims 1
- 238000007569 slipcasting Methods 0.000 claims 1
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 9
- 238000005065 mining Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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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
- E21D20/021—Grouting with inorganic components, e.g. cement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a method for reinforcing a prestressed grouting anchor cable of a belt main roadway bottom plate, which comprises a hole distribution step, an equipment erection step, a single-hole drilling step, a repeated single-hole drilling step, an anchor cable insertion step, a first grouting step, a hole sealing step, a net distribution step, a second grouting step which is completed seven days later in the first grouting step, a reinforcing steel joist and an anchor cable supporting plate installation step, and a self-aligning ball pad and a lock are matched to stretch and pre-tighten the anchor cable. The method for reinforcing the prestress grouting anchor cable of the belt main roadway bottom plate can ensure that the belt main roadway is safely and stably served for mine production after the belt main roadway bottom plate is reinforced.
Description
Technical Field
The invention relates to the field of mine roadway treatment, in particular to a device and a method for reinforcing a prestressed grouting anchor cable of a belt main roadway bottom plate.
Background
After the mine area roadway is produced and used for a certain period of time, the risk of engineering disasters caused by various factors is gradually increased, for example, a large roadway in a second mining area of a Sichuan coal mine is tunneled and stopped in 6 months in 2013, and is not maintained for 7 years. Under the influence of factors such as ground stress, structure and the like, three main roadways are greatly deformed, a bottom heave is particularly serious, the main roadways have large influence on ventilation, transportation, pedestrians and the like, the mining intensity is continuously increased, the mining difficulty is continuously increased, the engineering disasters encountered in the mining process of the mine are gradually increased, particularly, the mine pressure is aggravated, the surrounding rocks of the roadways are greatly deformed and seriously damaged, and the safety production of the mine is greatly threatened.
In order to thoroughly eliminate a series of hidden dangers brought by roadway floor heave, engineering technicians develop technical research of treatment of the roadway floor heave, mainly adopt technical routes of researching a roadway floor heave forming mechanism and influencing factors, analyzing a roadway surrounding rock deformation rule, providing effective roadway support parameters and floor heave treatment measures and the like, and ensure that the roadway floor heave of a secondary mining area is safely and stably served for mine production through project implementation.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a prestress grouting anchor cable reinforcing device for a belt roadway floor, which can thoroughly eliminate a series of hidden dangers caused by roadway floor heave after reinforcing the belt roadway.
The invention also aims to provide a method for reinforcing the prestress grouting anchor cable of the belt main roadway floor, which can ensure the safety and stability of the belt main roadway for mine production after reinforcing the belt main roadway floor.
In order to achieve the purpose, the invention provides a prestress grouting anchor cable reinforcing device for a belt roadway floor, which comprises a plurality of rows of floor drilling holes, a plurality of anchor cables, an anchor cable supporting plate, a reinforcing mesh, a plurality of reinforcing steel joist beams, an anchor cable supporting plate and grouting materials; multiple rows of bottom plate drill holes are uniformly arranged at the bottom plate of the large belt roadway at intervals, the number of the bottom plate drill holes in each row comprises three or four, and the bottom plate drill holes in the three rows and the bottom plate drill holes in the four rows are arranged at intervals; each anchor cable is inserted into a bottom plate drill hole, and the length of each anchor cable is greater than the depth of the bottom plate drill hole; the reinforcing mesh is laid on the belt roadway base plate, and the part of the anchor cables, which is exposed out of the drilled holes of the base plate, penetrates through the reinforcing mesh; the plurality of steel bar joists are pressed on the steel bar net at the drilling holes of the plurality of rows of bottom plates, and the parts of the plurality of anchor cables exposed out of the drilling holes of the bottom plates penetrate through the plurality of steel bar joists; the anchor cable supporting plate is matched with the aligning ball pad and the lock and locked at the part of each anchor cable exposed out of the steel bar joist; grouting material is poured into the gap between the anchor cable and the bottom plate drill hole.
In a preferred embodiment, the anchor cable adopts 1 x 7 strands of high-strength low-relaxation prestressed steel strands, the maximum force of the whole steel strand is not less than 530kN, and the maximum force total elongation is not less than 3.5%.
In a preferred embodiment, the grouting material includes cement paste and cement-water glass two-fluid paste.
In a preferred embodiment, the cement paste is prepared from 525# Portland cement, and the water-cement ratio of the cement paste is between 0.6: 1 and 0.8: 1.
In a preferred embodiment, the volume ratio of the cement paste to the water glass of the cement-water glass double-liquid paste is between 1: 0.4 and 1: 0.6, the water-cement ratio of the cement paste is between 0.6: 1 and 0.8: 1, the concentration of the water glass is between 38 and 42 Be', and the modulus of the water glass is between 2.8 and 3.2.
In order to achieve the above object, the present invention further provides a method for reinforcing a prestressed grouting anchor cable for a belt roadway floor, which uses the aforementioned device for reinforcing a prestressed grouting anchor cable, and the method for reinforcing a prestressed grouting anchor cable comprises the following steps: a hole distribution step: arranging a bottom plate drilling position on a belt main roadway bottom plate needing to be reinforced; and (3) equipment erection: erecting a drilling machine and cleaning floating slag on a bottom plate of a large tunnel of the belt; single hole drilling: drilling, water feeding and slag discharging are carried out according to the drilling position of the bottom plate in the hole distribution step, the drill bit of the drill rod is withdrawn to finish single-hole drilling, and then the single-hole drilling step is repeated for multiple times until all the bottom plate drilling is finished; an anchor cable inserting step: inserting an anchor cable into each bottom plate drill hole, inserting the lower end of the anchor cable into the bottom of the bottom plate drill hole, and exposing the upper end of the anchor cable out of the bottom plate drill hole; a first grouting step: firstly, inserting a first grouting pipe into the bottom of a drilled hole of a bottom plate along a gap between an anchor cable and the drilled hole of the bottom plate, filling crushed stone powder into the drilled hole of the bottom plate, then injecting grouting materials into the drilled hole of the bottom plate through the first grouting pipe, wherein the stacking height of the grouting materials is 20-30% of the drilling depth of the bottom plate, the grouting amount is 4-5 liters, and then pulling out the first grouting pipe; hole sealing step: sleeving the anchor cable by using a second grouting pipe and inserting the anchor cable into the bottom plate drill hole, wherein the length of the second grouting pipe exposed out of the bottom plate drill hole is not less than that of the anchor cable exposed out of the bottom plate drill hole, and then sealing the pipe orifice of the second grouting pipe by using face yarn matched with cement or face yarn matched with chemical slurry; a step of net distribution: paving a steel bar mesh on the bottom plate of the belt main roadway, and enabling the part of the second grouting pipe exposed out of the drilled hole of the bottom plate to penetrate through the steel bar mesh; and a second grouting step: and after the first grouting step is completed for seven days, removing the sealing object at the orifice of the second grouting pipe, adopting a grouting machine to perform second grouting from the second grouting pipe into the drilled hole of the bottom plate, after the drilled hole of the bottom plate is filled with the grouting material, pulling out the second grouting pipe, immediately installing a steel bar supporting beam and an anchor cable supporting plate, and performing tensioning and pre-tightening on the anchor cable by matching with the aligning ball pad and the lock.
In a preferred embodiment, the positions of the bottom plate drill holes distributed in the hole distribution step are multiple rows of bottom plate drill holes uniformly arranged at intervals along the trend of the bottom plate of the large tunnel of the belt, the number of the bottom plate drill holes in each row is three or four, the bottom plate drill holes in the three rows and the bottom plate drill holes in the four rows are arranged at intervals, two bottom plate drill holes close to one side of the belt are arranged on two sides of the belt, and the distances between the two bottom plate drill holes and the belt are the same.
In a preferred embodiment, the cable bolt is pretensioned by tension for the first time to not less than 150KN and for the second time to not less than 250 KN.
In a preferred embodiment, the hole distribution step is preceded by an exploration step, which comprises the steps of field production of the belt roadway bottom plate, geological condition investigation and surrounding rock structure detailed investigation, and a construction scheme is made by combining engineering practice with reference to the original support strength.
In a preferred embodiment, the method further comprises a preparation step after the exploration step and before the hole distribution step, wherein the preparation step comprises the steps of preparing all materials and tools required for reinforcement, ensuring the quality and carrying out technical training on a construction team, so that the construction team can know the reinforcement purpose, the construction process and the requirements and master the operation of the tools.
Compared with the prior art, the device and the method for reinforcing the prestress grouting anchor cable of the belt main roadway bottom plate have the following beneficial effects: through on-site production, geological condition investigation and surrounding rock structure detailed investigation of the belt roadway, and reference to the original support strength and combination of a large amount of engineering practices, the technical routes of researching a roadway floor heave formation mechanism and influence factors, analyzing a roadway surrounding rock deformation rule, providing effective roadway support parameters and floor heave treatment measures and the like are researched, on the premise of ensuring the engineering quality and reducing the engineering quantity as much as possible, a floor prestressed grouting anchor cable reinforcing device is adopted for a base plate of the belt roadway to carry out reinforcement treatment, a series of hidden dangers brought by the roadway floor heave are thoroughly eliminated, and the safety and stability of the belt roadway are guaranteed to serve for mine production.
Drawings
Fig. 1 is a schematic plan view of a pre-stressed grouting anchor cable reinforcement according to an embodiment of the present invention;
fig. 2 is a schematic view of the arrangement of the vertical structure of a pre-stressed grouting anchor cable reinforcement device according to an embodiment of the invention;
FIG. 3 is a schematic front view of a cable bolt carrier according to an embodiment of the present invention;
FIG. 4 is a schematic top cross-sectional view of a cable bolt carrier according to an embodiment of the invention;
FIG. 5 is a schematic perspective view of a cable bolt carrier according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a method for reinforcing a prestressed grouting anchor cable according to an embodiment of the present invention.
Description of the main reference numerals:
1-anchor cable, 2-anchor cable supporting plate, 21-anchor cable hole, 22-spherical arch part, 3-reinforcing mesh, 4-first reinforcing steel bar joist, 5-second reinforcing steel bar joist and H-anchor cable supporting plate height.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 1 to 2, a prestressed grouting anchor cable reinforcement device for a belt roadway floor according to a preferred embodiment of the present invention includes a plurality of rows of floor boreholes, a plurality of anchor cables 1, anchor cable trays 2, a mesh reinforcement 3, a plurality of steel joists, and a grouting material. The multiple rows of bottom plate drill holes are uniformly arranged at the bottom plate of the large belt roadway at intervals, the number of the bottom plate drill holes in each row comprises three or four, and the bottom plate drill holes in one row of three and the bottom plate drill holes in one row of four are arranged at intervals. Each anchor cable 1 is inserted into a bottom plate drilling hole, and the length of each anchor cable 1 is larger than the depth of the bottom plate drilling hole. The reinforcing mesh 3 is laid on the belt roadway bottom plate, and the part of the anchor cables 1, which is exposed out of the drilled holes of the bottom plate, penetrates through the reinforcing mesh 3. And the plurality of steel bar joists are pressed on the steel bar meshes 3 at the drilling holes of the plurality of rows of bottom plates, and the parts of the plurality of anchor cables 1 exposed out of the drilling holes of the bottom plates penetrate through the plurality of steel bar joists. The anchor cable supporting plate 2 is matched with the aligning ball pad and the lock to be locked at the part of each anchor cable 1, which is exposed out of the steel bar joist. Grouting material is poured into the gap between the anchor cable 1 and the floor borehole.
Referring to fig. 1, in some embodiments, the bottom plate drilled holes are symmetrically disposed near both sides of the main belt, and have the same distance from the sidewall of the main belt, such that the width of the main belt is about 5m, the distance from the bottom plate drilled holes to the sidewall of the main belt is about 550mm, and the distance between the two sides of the belt is about 1.7 m. The holes are drilled on the bottom plate in a row of four holes and a row of three holes at intervals, and the interval distance between the rows is about 1.5 meters per month. The above data are illustrative, and the present invention is not limited thereto, and can be adjusted appropriately according to actual needs.
Referring to fig. 2, in some embodiments, the bottom plate bore hole located in the middle of the roadway is substantially perpendicular to the roadway bottom plate, the depth is about 5 meters, the diameter is about 55mm, and the bottom plate bore hole near the side wall of the roadway may be outwardly deflected by an angle of about 5 °. The drilling depth of the bottom plate is not constant, and the drilling depth can be properly deepened and the density can be increased at a required place according to the field exploration result so as to ensure the requirement of local reinforcement.
In some embodiments, the anchor cable 1 is made of 21.6mm phi, 1 × 7 strands of high-strength low-relaxation prestressed steel strands, the maximum force of the whole steel strand is not less than 530kN, and the maximum force total elongation is not less than 3.5%. The length of each anchor cable 1 is about 5.3 m, which is about 300mm longer than the length of the drilled hole of the bottom plate for anchorage locking.
In some embodiments, a birdcage is also arranged at a distance of 0.5 m, 1 m and 1.5 m from the lower end of each anchor cable 1, and the birdcage is arranged by pulling apart 1 × 7 strands of high-strength low-relaxation prestressed steel strands to support the birdcage between the steel strands. The birdcage anchor cable 1 can enhance the bonding strength between the anchor cable 1 and the grouting material and between the anchor cable and the drilled holes in the bottom plate.
In some embodiments, the rebar joists comprise two specifications, namely a first rebar joists 4 for locking three anchor lines 1 and a second rebar joists 5 for anchoring four anchor lines 1, wherein the two specifications are about 4320mm and 3770mm long (the length of the rebar joists can be 4320 mm), and are made of two 20mm diameter rebars.
As shown in fig. 3 to 5, in some embodiments, the anchor cable support plate 2 is an arch-shaped high-strength anchor cable support plate 2 with a height of 300 × 300 × 16mm, the height of the anchor cable support plate 2 is not less than 60mm, and the high-strength self-aligning ball pad is matched with the anchor cable 1 in terms of mechanical properties.
In some embodiments, the mesh reinforcement 3 is made of 2300 × 1400(mm) pieces of mesh. However, the invention is not limited thereto.
In some embodiments, the grouting material includes a cement slurry and a cement-water glass dual fluid slurry. The cement paste is prepared from 525# ordinary portland cement, and the water-cement ratio of the cement paste is between 0.6: 1 and 0.8: 1. The volume ratio of cement paste of the cement-water glass double-liquid paste to water glass is 1: 0.4-1: 0.6, the water cement ratio of the cement paste is 0.6: 1-0.8: 1, the concentration of the water glass is 38-42 Be', and the modulus of the water glass is 2.8-3.2.
As shown in fig. 6, in order to achieve the above object, the present invention further provides a method for reinforcing a belt roadway floor by using a pre-stressed grouting anchor cable 1, where the method for reinforcing a belt roadway floor by using a pre-stressed grouting anchor cable 1 includes the following steps: a hole distribution step: arranging a bottom plate drilling position on a belt main roadway bottom plate needing to be reinforced; and (3) equipment erection: erecting a drilling machine and cleaning floating slag on a bottom plate of a large tunnel of the belt; single hole drilling: drilling, water feeding and slag discharging are carried out according to the drilling position of the bottom plate in the hole distribution step, the drill bit of the drill rod is withdrawn to finish single-hole drilling, and then the single-hole drilling step is repeated for multiple times until all the bottom plate drilling is finished; inserting the anchor cable 1: inserting an anchor cable 1 into each bottom plate drill hole, inserting the lower end of the anchor cable 1 into the bottom of the bottom plate drill hole, and exposing the upper end of the anchor cable 1 out of the bottom plate drill hole; a first grouting step: firstly, inserting a first grouting pipe (a 4-minute plastic pipe can be adopted) into the bottom of a drilled hole of a bottom plate along a gap between an anchor cable 1 and the drilled hole of the bottom plate, filling crushed stone powder with the particle size of below 5mm into the drilled hole of the bottom plate, then injecting grouting materials into the drilled hole of the bottom plate through the first grouting pipe, wherein the stacking height of the grouting materials is 20-30% of the drilling depth of the bottom plate, and the grouting amount is 4-5 liters (the grouting height is about 1-1.5 meters), and then pulling out the first grouting pipe; hole sealing step: sleeving the anchor cable 1 by using a second grouting pipe and inserting the anchor cable into the drilled hole of the bottom plate, wherein the length of the drilled hole of the bottom plate exposed by the second grouting pipe is not less than that of the drilled hole of the bottom plate exposed by the anchor cable 1, and then sealing the pipe orifice of the second grouting pipe by using face yarn matched with cement or face yarn matched with chemical grout; a step of net distribution: paving a steel bar mesh 3 on a base plate of the belt main roadway, and enabling the part of the second grouting pipe exposed out of the drilled hole of the base plate to penetrate through the steel bar mesh 3; and a second grouting step: and after the first grouting step is completed for seven days, removing the sealing object at the orifice of the second grouting pipe, grouting materials from the second grouting pipe into the drilled hole of the bottom plate by using a grouting machine for the second time, pulling out the second grouting pipe after the drilled hole of the bottom plate is filled with the grouting materials, immediately installing the steel bar support beam and the anchor cable support plate 2, and stretching and pre-tightening the anchor cable 1 by matching with the aligning ball pad and the lock.
In some embodiments, the grouting pressure is: and (3) first pouring, anchoring the bottom end of the anchor cable 1, grouting at the pressure of 0, and grouting at the pressure of 1-2 MPa for the second time before tensioning.
In some embodiments, the positions of the bottom plate drill holes distributed in the hole distribution step are multiple rows of bottom plate drill holes uniformly arranged at intervals along the direction of the bottom plate of the large tunnel of the belt, the number of the bottom plate drill holes in each row is three or four, the bottom plate drill holes in three rows and the bottom plate drill holes in four rows are arranged at intervals, two bottom plate drill holes close to one side of the belt are arranged on two sides of the belt, and the distances between the two bottom plate drill holes and the belt are the same.
In some embodiments, the cable bolt 1 is tensioned and pre-tensioned for the first time to not less than 150KN and for the second time to not less than 250 KN.
In some embodiments, the hole distribution step is preceded by an exploration step, which comprises field production of the belt roadway bottom plate, geological condition investigation and surrounding rock structure detailed investigation, and a construction scheme is made by combining engineering practice with reference to the original support strength.
In some embodiments, the method further comprises a preparation step after the exploration step and before the hole distribution step, wherein the preparation step comprises the steps of preparing all materials and tools required for reinforcement, ensuring the quality, and carrying out technical training on a construction team, so that the construction team can know the reinforcement purpose, the construction process and the requirements, and master the operation of the tools.
In some embodiments, the construction process of the method for reinforcing the prestressed grouting anchor cable of the belt roadway floor according to the present invention may refer to the following sequence: arranging holes, erecting a drilling machine, cleaning scum of a bottom plate, drilling holes, delivering water, discharging slag, drilling holes, withdrawing a drill rod, inserting a drill bit into an anchor rope of the bottom plate until the bottom of the hole is filled with stone powder → the first grouting → installing a rubber plug, inserting an aluminum-plastic pipe → sealing holes → 7 days later, performing second grouting until the final pressure → disassembling a grouting system, installing a steel bar joist, a tray, a ball pad and a lock → tensioning and pre-tightening.
The technical requirements of the device and the method for reinforcing the prestress grouting anchor cable of the belt main roadway bottom plate are as follows:
the hole opening position is accurate, and the allowable deviation is +/-200 mm;
secondly, grouting test is carried out before construction is started, and indexes such as slurry filling rate, grouting amount, proper slurry proportion, slurry diffusion radius, grouting final pressure and the like are preliminarily mastered;
thirdly, the cement slurry strictly controls the water-cement ratio of the slurry, and reduces the excess water quantity except hydration reaction;
fourthly, grouting operation of each hole is continuously carried out, interruption is not needed in midway, and grouting interruption caused by problems of mechanical failure, power failure, water cut, equipment failure and the like is avoided as much as possible. When grouting is interrupted due to large-scale leakage or excessive slurry consumption, accurately recording in a construction log, ensuring the grouting quality of peripheral drilling holes, and repairing grouting holes if necessary;
when adjacent drilling holes are subjected to serial grouting in the grouting process, alternate grouting or separate pipeline simultaneous grouting must be performed on the drilling holes subjected to serial grouting, simultaneous grouting of two or more serial grouting drilling holes by using one drilling hole is forbidden, and grouting conditions of communicated drilling holes are respectively recorded;
sixthly, the system operation in the grouting process must be reliable, whether the pressure gauge is normal or not is checked at any time, the pressure gauge is replaced in time when a fault occurs, and grouting construction is forbidden under the condition that the pressure gauge is in a fault state.
The safety technical measures of the device and the method for reinforcing the prestress grouting anchor cable of the belt main roadway bottom plate are as follows:
(1) during grouting, the personnel keep away from the grouting hole, and prevent that high-pressure thick liquid from spouting suddenly and hurting the people.
(2) When the anchor cable is stretched, two persons cooperate, the stretching oil cylinder and the steel strand are kept on the same axis, and after pressurization, the tool anchor clamps the steel strand to release the hand. The operator should avoid the axial direction of the tensioning cylinder to ensure safety.
(3) When the anchor cable is stretched, the unqualified anchor cable is found, and the qualified anchor cable is required to be additionally arranged nearby the unqualified anchor cable. After the anchor cable 1 is installed for two days, if the pretightening force is reduced, the pretightening force must be supplemented in time.
(4) In order to avoid the influence of the exposed end of the anchor cable on the service space of the roadway, the exposed end of the steel strand is split after construction is finished, and the steel strand is flattened and gunited to cover.
(5) The construction process strictly executes the relevant regulations of coal mine safety regulations.
In conclusion, the device and the method for reinforcing the prestress grouting anchor cable of the belt roadway floor have the following advantages: through on-site production, geological condition investigation and surrounding rock structure detailed investigation of the belt roadway, and reference to the original support strength and combination of a large amount of engineering practices, the technical routes of researching a roadway floor heave formation mechanism and influence factors, analyzing a roadway surrounding rock deformation rule, providing effective roadway support parameters and floor heave treatment measures and the like are researched, on the premise of ensuring the engineering quality and reducing the engineering quantity as much as possible, a floor prestressed grouting anchor cable reinforcing device is adopted for a base plate of the belt roadway to carry out reinforcement treatment, a series of hidden dangers brought by the roadway floor heave are thoroughly eliminated, and the safety and stability of the belt roadway are guaranteed to serve for mine production.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a prestressing force slip casting anchor rope reinforcing apparatus of big lane bottom plate of belt which characterized in that includes:
the bottom plate drill holes are uniformly arranged at the bottom plate of the large belt roadway at intervals, the number of the bottom plate drill holes in each row comprises three or four, and the bottom plate drill holes in the three rows and the bottom plate drill holes in the four rows are arranged at intervals;
each anchor cable is inserted into one bottom plate drilling hole, and the length of each anchor cable is larger than the depth of the bottom plate drilling hole;
a reinforcing mesh laid on the belt roadway floor, wherein the part of the anchor cables exposed out of the floor drilling holes penetrates through the reinforcing mesh;
the reinforcing steel bar joists are pressed on the reinforcing steel bar nets at the drilling holes of the multiple rows of bottom plates, and the parts of the anchor cables, which are exposed out of the drilling holes of the bottom plates, penetrate through the reinforcing steel bar joists;
the anchor cable supporting plate is matched with an aligning ball pad and a lock and locked at the part of each anchor cable exposed out of the steel bar joist; and
grouting material poured into the gap between the anchor cable and the floor bore.
2. The device for reinforcing the prestressed grouting anchor rope for the belt roadway floor as claimed in claim 1, wherein 1 x 7 strands of high-strength low-relaxation prestressed steel strands are used as the anchor rope, the maximum force of the whole strand is not less than 530kN, and the maximum force total elongation is not less than 3.5%.
3. The prestressed grouting anchor cable reinforcement device for a belt roadway floor as claimed in claim 1, wherein said grouting material comprises cement paste and cement-water glass two-fluid paste.
4. The device for reinforcing the prestressed grouting anchor cable of the belt roadway floor as claimed in claim 3, wherein the cement paste is prepared from 525# Portland cement, and the water cement ratio of the cement paste is 0.6: 1-0.8: 1.
5. The device for reinforcing the prestressed grouting anchor cable of the belt roadway floor as claimed in claim 3, wherein the volume ratio of the cement paste of the cement-water glass double-liquid paste to the water glass is between 1: 0.4 and 1: 0.6, the water cement ratio of the cement paste is between 0.6: 1 and 0.8: 1, the concentration of the water glass is between 38 and 42 Be', and the modulus of the water glass is between 2.8 and 3.2.
6. A method for reinforcing a prestressed grouting anchor cable of a belt main roadway floor, which adopts the device for reinforcing the prestressed grouting anchor cable of claims 1 to 5, is characterized by comprising the following steps:
a hole distribution step: arranging the positions of the floor drill holes on the floor of the belt main roadway needing to be reinforced;
and (3) equipment erection: erecting a drilling machine and cleaning floating slag on a bottom plate of the large tunnel of the belt;
single hole drilling: drilling, water feeding and slag discharging are carried out according to the drilling position of the bottom plate in the hole distribution step, and the drill bit of the drill rod is withdrawn to finish single-hole drilling, and then the single-hole drilling step is repeated for multiple times until all the bottom plate drilling is finished;
an anchor cable inserting step: inserting the anchor cable into each bottom plate drill hole, inserting the lower end of the anchor cable into the bottom of the bottom plate drill hole, and exposing the upper end of the anchor cable out of the bottom plate drill hole;
a first grouting step: firstly, inserting a first grouting pipe into the bottom of a drilled hole of the bottom plate along a gap between the anchor cable and the drilled hole of the bottom plate, filling crushed stone powder into the drilled hole of the bottom plate, then injecting the grouting material into the drilled hole of the bottom plate through the first grouting pipe, wherein the stacking height of the grouting material is 20-30% of the drilling depth of the bottom plate, the grouting amount is 4-5 liters, and then pulling out the first grouting pipe;
hole sealing step: sleeving the anchor cable by using a second grouting pipe and inserting the second grouting pipe into the bottom plate drill hole, wherein the length of the second grouting pipe exposed out of the bottom plate drill hole is not less than the length of the anchor cable exposed out of the bottom plate drill hole, and then sealing the pipe orifice of the second grouting pipe by using face yarn matched cement or face yarn matched chemical pulp;
a step of net distribution: paving the steel bar mesh on the belt roadway floor, wherein the part of the second grouting pipe exposed out of the drilled hole of the floor penetrates through the steel bar mesh; and
and a second grouting step: and after the first grouting step is completed for seven days, removing the sealing object at the orifice of the second grouting pipe, adopting a grouting machine to fill the grouting material into the bottom plate drill hole for the second time from the second grouting pipe, after the grouting material is filled in the bottom plate drill hole, pulling out the second grouting pipe to immediately install the steel bar supporting beam and the anchor cable supporting plate, and matching with the aligning ball pad and the lock to stretch and pre-tighten the anchor cable.
7. The method for reinforcing the prestressed grouting anchor cable of the floor of the belt roadway as claimed in claim 6, wherein the locations of the floor boreholes arranged in the hole arrangement step are multiple rows of floor boreholes arranged at regular intervals along the direction of the floor of the belt roadway, the number of the floor boreholes in each row is three or four, the floor boreholes in three rows are arranged at intervals with the floor boreholes in four rows, two floor boreholes close to one side of the belt are arranged on both sides of the belt, and the two floor boreholes are arranged at the same distance from the belt.
8. The method for reinforcing the prestressed grouting anchor cable of the belt roadway floor as claimed in claim 6, wherein the tension pretension of the anchor cable is not less than 150KN for the first time and not less than 250KN for the second time.
9. The method for reinforcing the prestressed grouting anchor cable of the belt main roadway floor as claimed in claim 6, wherein an exploration step is further included before the hole arrangement step, which includes on-site production, geological condition investigation and surrounding rock structure detailed investigation of the belt main roadway floor, and a construction scheme is made by referring to the original support strength and combining engineering practice.
10. The method for reinforcing a prestressed grouting anchor cable for a belt roadway floor as claimed in claim 9, wherein after said step of exploring, a step of preparing is further included before said step of arranging holes, which includes the steps of preparing all materials and tools required for reinforcement, ensuring quality, and performing technical training on a construction team, so that the construction team can know the purpose of reinforcement, construction process and requirements, and grasp the operation of the tools.
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| CN202110945402.9A CN113482681A (en) | 2021-08-17 | 2021-08-17 | Device and method for reinforcing prestress grouting anchor cable of belt main roadway bottom plate |
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| CN202110945402.9A CN113482681A (en) | 2021-08-17 | 2021-08-17 | Device and method for reinforcing prestress grouting anchor cable of belt main roadway bottom plate |
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