CN117345250A - Construction method for removing hole excavation supporting - Google Patents
Construction method for removing hole excavation supporting Download PDFInfo
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- CN117345250A CN117345250A CN202311342572.3A CN202311342572A CN117345250A CN 117345250 A CN117345250 A CN 117345250A CN 202311342572 A CN202311342572 A CN 202311342572A CN 117345250 A CN117345250 A CN 117345250A
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 78
- 238000010276 construction Methods 0.000 title claims abstract description 65
- 230000008093 supporting effect Effects 0.000 title claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 46
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 37
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 239000011435 rock Substances 0.000 claims abstract description 23
- 239000011378 shotcrete Substances 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000002360 explosive Substances 0.000 claims abstract description 13
- 239000004567 concrete Substances 0.000 claims description 21
- 239000004575 stone Substances 0.000 claims description 17
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000011068 loading method Methods 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000001723 curing Methods 0.000 claims description 7
- 238000005336 cracking Methods 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 230000002028 premature Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 208000022971 Tuberculous meningitis Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 208000001223 meningeal tuberculosis Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
-
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a construction method for removing a hole and excavating and supporting, and particularly relates to the technical field of TBM (Tunnel boring machine) hole removing construction; step two, performing preliminary excavation of the disassembly holes by adopting a drilling and splitting method; step three, adopting a step method to carry out excavation construction; step four, construction monitoring is carried out in the process of dismantling the hole excavation; fifthly, adopting drilling, splitting and digging construction at the non-explosive digging position of the detached hole; and step six, reinforcing mesh construction and shotcrete support. According to the invention, harder rock and rock strata are excavated by the drilling and splitting method, so that rock excavation is rapidly carried out, the method is particularly suitable for large-scale excavation engineering, the excavation construction efficiency of a detached hole is improved, the step method is used after the preliminary excavation and detachment of the hole are finished by the drilling and splitting method, the construction efficiency is ensured, the safety of subsequent construction is ensured, and the step method can reduce the risk of rock collapse and improve the construction safety due to the adoption of a grading excavation mode.
Description
Technical Field
The invention belongs to the technical field of TBM (tunnel boring machine) dismantling hole construction, and particularly relates to a dismantling hole excavation supporting construction method.
Background
In the field of engineering construction, TBMs represent tunnel boring machines, also known as shield machines. The TBM disassembly hole is a cavity or hole which is formed by disassembling the TBM from a tunnel after tunneling is completed.
TBM is an expensive construction equipment, and can be recycled after being disassembled. For future tunnel projects, the TBM is partially or fully reused, so that cost and time can be saved, and the TBM can be subjected to abrasion and damage in a long-time construction process. Sometimes, the TBM needs to be disassembled and taken out of the tunnel for maintenance, repair or replacement of components, so that a disassembly hole needs to be excavated to facilitate the disassembly and the removal of the TBM, the disassembly hole is important, but the TBM is not a part of the tunnel, and when the TBM is used, the TBM needs to be high in excavation supporting construction efficiency, and meanwhile, good supporting effect and firmness and safety of the disassembly hole are guaranteed, so that the construction method for the excavation supporting of the disassembly hole is provided.
Disclosure of Invention
The invention provides a construction method for removing a hole to excavate and support, which aims to solve the problems.
The invention is realized in such a way that the invention provides the following technical scheme: the construction method for the excavation supporting of the detachable hole comprises the following steps:
firstly, dismantling hole excavation preparation work, reasonably arranging and preparing surrounding environments before dismantling hole excavation, firstly removing sundries around a TBM, removing auxiliary facilities around the TBM, setting protective measures, setting up protective fence around the dismantling hole excavation position, setting a warning sign, and reserving a pilot pit platform in advance in a hidden excavation section;
step two, carrying out preliminary excavation of a disassembly hole by adopting a drilling and splitting method, uniformly arranging a plurality of drilling holes at the excavation position of the disassembly hole through a drilling machine, loading explosive into a pre-designed explosive package after the drilling, installing a detonating device through a firing cable, igniting the firing cable, detonating the explosive, cracking and splitting rock, cracking and breaking the rock by shock waves and stress generated by blasting, forming a preliminary disassembly hole, loading slag through a digging machine, transporting the slag by a self-discharging automobile, and cleaning broken stone and slag soil in the preliminary disassembly hole;
step three, performing excavation construction by adopting a step method, namely determining the height and the width of each step by setting elevation on a preliminary disassembly hole, performing excavation of the first step by using an excavator, excavating downwards layer by layer, ensuring that the height and the gradient of each step meet design requirements, cleaning an excavation surface after the excavation of each step is completed, and performing leveling treatment to complete the excavation construction of the disassembly hole;
step four, performing construction monitoring in the process of dismantling the hole excavation, and performing real-time monitoring on vibration, displacement, noise and the like generated in the step two and the step three by installing a monitoring instrument at the position of dismantling the hole excavation;
step five, adopting drilling, splitting and digging construction at the non-explosive digging position of the dismounting hole, forming a new temporary face by continuously biting and drilling holes in the middle part of the face or along the periphery of the outer contour of the dismounting hole, drilling holes on the face by using a down-the-hole drill, putting a splitting machine into a splitting machine to break rock after drilling, loading and breaking layer by layer from the vicinity of the created temporary face, and carrying out secondary breaking by using a breaking hammer to break the temporary face into reasonable blocks, and carrying out ballast transportation by a dump truck;
step six, reinforcing mesh construction and shotcrete support:
s1, before construction of sprayed concrete and a reinforcing mesh, cleaning a sprayed surface, so that loose rock blocks and virtual slag accumulation on a wall foot are avoided on the sprayed surface, rotating the reinforcing mesh on the sprayed surface, and inserting the bottom of the reinforcing mesh into the bottom of the inner wall of a disassembly hole;
s2, selecting 42.5-grade ordinary silica cement, accelerator, river sand and stone, stirring by adopting an automatic metering mixer, sequentially adding screened sand, broken stone and cement during construction, then adding water to start stirring, strictly grasping the specified accelerator mixing amount and concrete mixing ratio during stirring, controlling the water-cement ratio to be 1:2 generally, and transporting the concrete mixture to a wet spraying machine by a concrete transportation vehicle after the concrete mixture is uniformly stirred;
s3, primary spraying firstly arches and then arches, secondary spraying firstly arches and then arches, spraying sequentially downwards and upwards, preventing rebound concrete from blocking an unsprayed rock face, and timely taking effective measures to carry out maintenance after the sprayed concrete is finally set for 2 hours, wherein the maintenance time is not less than 7d.
In a preferred embodiment, the first step is a hidden or semi-hidden excavation work performed to avoid subsidence of the earth surface or excessive influence on the surrounding environment during tunnel construction, and the first step is a pit guiding platform for assisting in guiding and controlling the position and direction of drilling or excavating equipment during underground excavation.
In a preferred embodiment, the step three method is used for steeper earth-rock slope or cut excavation.
In a preferred embodiment, the splitting machine in the fifth step drives the middle wedge block in the wedge block to extend forwards by a huge pushing force generated by the ultrahigh oil pressure output by the hydraulic power station, so that the splitting block is pushed to expand towards two sides, and a strong expanding force is caused on the hole wall to cause rock fracture.
In a preferred embodiment, in the sixth step, the reinforcing mesh is intensively processed in a reinforcing processing field, the reinforcing bars are straightened by a reinforcing bar straightening machine and then cut into reinforcing bars, the reinforcing mesh is formed by welding, and oil stains, paint stains, cement paste on the surface of the reinforcing bars, floating skin, rust and the like which can be peeled off by hammering are cleaned and tested to be qualified before the reinforcing bars are welded; the processed reinforcing mesh should be flat, and the surface of the reinforcing steel bar has no flaws which weaken the section of the reinforcing steel bar.
In a preferred embodiment, the initial setting of the setting agent in step six is not more than 5min and the final setting is not more than 10min, and the stone in step six adopts hard-textured crushed stone.
In a preferred embodiment, the sprayed concrete curing method in the sixth step is to keep the concrete surface wet by using water spraying, a cover wet cloth or a sprayer method, and the sprayed concrete curing method in the sixth step is to prevent the premature evaporation of water and control the temperature of the concrete to be in a proper range.
In a preferred embodiment, the monitoring instrument in the fourth step is a peripheral structure deformation monitoring instrument, a vibration monitoring instrument and a noise monitoring instrument, the monitoring instrument in the fourth step is used for monitoring deformation conditions of structures such as a peripheral building of a detached hole, an underground pipeline and the like, the vibration monitoring instrument is used for monitoring vibration conditions generated in the process of detaching the hole and influence degrees on the peripheral structure, the underground pipeline and the like, and the noise monitoring instrument is used for monitoring noise conditions generated in the process of detaching the hole and influence degrees on the peripheral environment and personnel
Compared with the prior art, the invention has the beneficial effects that:
1. the method is particularly suitable for large-scale excavation projects, improves the excavation construction efficiency of a detached hole, and ensures the construction efficiency and the safety of subsequent construction by using a step method after the hole is initially excavated and detached by using the drill and split method;
2. the reinforcing mesh is arranged on the sprayed surface of the detachable hole, and then the reinforcing mesh and the sprayed surface are supported in a concrete spraying mode, and the sprayed concrete and the reinforcing mesh have the characteristics of high strength and good compactness, so that a good supporting effect can be provided, the supporting effect of the detachable hole is further improved, and the collapse risk of the detachable hole is avoided;
3. through dismantling the hole excavation in-process and carry out the construction monitoring, peripheral structure deformation monitoring instrument, vibration monitoring instrument and noise monitoring instrument monitor the surrounding environment, ensure to demolish the security of construction and the stability of building around, do sufficient preparation work before the excavation, build the protection around the position periphery of dismantling the hole excavation to set up the warning sign, clear away the peripheral debris of TBM, remove the peripheral affiliated facilities of TBM, set up safeguard measure, improve the construction security.
Drawings
Fig. 1 is a schematic flow structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
the construction method for the excavation supporting of the detachable hole comprises the following steps:
firstly, dismantling hole excavation preparation work, reasonably arranging and preparing surrounding environments before dismantling hole excavation, firstly removing sundries around a TBM, removing auxiliary facilities around the TBM, setting protective measures, setting up protective fence around the dismantling hole excavation position, setting a warning sign, and reserving a pilot pit platform in advance in a hidden excavation section;
the first step is that the underground excavation section is used for carrying out hidden excavation work for avoiding subsidence of the earth surface or overlarge influence on the surrounding environment in the tunnel construction process, and the first step is that the pilot pit platform is used for assisting in guiding and controlling the position and the direction of drilling or excavating equipment in the underground excavation process;
step two, carrying out preliminary excavation of a disassembly hole by adopting a drilling and splitting method, uniformly arranging a plurality of drilling holes at the excavation position of the disassembly hole through a drilling machine, loading explosive into a pre-designed explosive package after the drilling, installing a detonating device through a firing cable, igniting the firing cable, detonating the explosive, cracking and splitting rock, cracking and breaking the rock by shock waves and stress generated by blasting, forming a preliminary disassembly hole, loading slag through a digging machine, transporting the slag by a self-discharging automobile, and cleaning broken stone and slag soil in the preliminary disassembly hole;
step three, performing excavation construction by adopting a step method, namely determining the height and the width of each step by setting elevation on a preliminary disassembly hole, performing excavation of the first step by using an excavator, excavating downwards layer by layer, ensuring that the height and the gradient of each step meet design requirements, cleaning an excavation surface after the excavation of each step is completed, and performing leveling treatment to complete the excavation construction of the disassembly hole;
step three, the step method is used for excavating steeper soil and stone slopes or cutting;
step four, performing construction monitoring in the process of dismantling the hole excavation, and performing real-time monitoring on vibration, displacement, noise and the like generated in the step two and the step three by installing a monitoring instrument at the position of dismantling the hole excavation so as to ensure the safety of dismantling construction and the stability of surrounding buildings;
the monitoring instruments in the fourth step are peripheral structure deformation monitoring instruments, vibration monitoring instruments and noise monitoring instruments, the monitoring instruments in the fourth step are used for monitoring deformation conditions of structures such as a building, an underground pipeline and the like around the detached hole, the vibration monitoring instruments are used for monitoring vibration conditions generated in the construction process of the detached hole, influence degrees on the peripheral structure, the underground pipeline and the like, and the noise monitoring instruments are used for monitoring noise conditions generated in the construction process of the detached hole and influence degrees on the peripheral environment and personnel;
step five, adopting drilling, splitting and digging construction at the non-explosive digging position of the dismounting hole, forming a new temporary face by continuously biting and drilling holes in the middle part of the face or along the periphery of the outer contour of the dismounting hole, drilling holes on the face by using a down-the-hole drill, putting a splitting machine into a splitting machine to break rock after drilling, loading and breaking layer by layer from the vicinity of the created temporary face, and carrying out secondary breaking by using a breaking hammer to break the temporary face into reasonable blocks, and carrying out ballast transportation by a dump truck;
in the fifth step, the splitter drives the middle wedge block in the wedge block group to extend forwards through a huge pushing force generated by the ultrahigh oil pressure output by the hydraulic power station to push the split blocks to expand towards two sides, so that a strong expanding force is generated on the hole wall to cause rock fracture;
step six, reinforcing mesh construction and shotcrete support:
s1, before construction of sprayed concrete and a reinforcing mesh, cleaning a sprayed surface, so that loose rock blocks and virtual slag accumulation on a wall foot are avoided on the sprayed surface, rotating the reinforcing mesh on the sprayed surface, and inserting the bottom of the reinforcing mesh into the bottom of the inner wall of a disassembly hole;
the reinforcing mesh is intensively processed in a reinforcing processing field, firstly, a reinforcing straightening machine is used for straightening reinforcing bars, then the reinforcing bars are cut into reinforcing bars, the reinforcing mesh is formed by welding, and oil stains, paint dirt, cement paste on the surface of the reinforcing bars, floating skin, rust and the like which can be peeled off by hammering are cleaned and tested to be qualified before the reinforcing bars are welded; the processed reinforcing mesh is flat, and the surface of the reinforcing steel bar is free from flaws which weaken the section of the reinforcing steel bar;
s2, selecting 42.5-grade ordinary silica cement, accelerator, river sand and stone, stirring by adopting an automatic metering mixer, sequentially adding screened sand, broken stone and cement during construction, then adding water to start stirring, strictly grasping the specified accelerator mixing amount and concrete mixing ratio during stirring, controlling the water-cement ratio to be 1:2 generally, and transporting the concrete mixture to a wet spraying machine by a concrete transportation vehicle after the concrete mixture is uniformly stirred;
setting accelerator for no more than 5min at initial setting and no more than 10min at final setting, wherein stone materials are hard broken stone materials in the step six;
s3, primary spraying firstly arches and then the wall, secondary spraying firstly arches and then the spraying sequence is downwards and upwards, so that the rebound concrete is prevented from blocking the surface of the non-sprayed rock, after the sprayed concrete is finally set for 2 hours, effective measures are adopted in time for curing, and the curing time is not less than 7d;
the sprayed concrete curing mode is to keep the concrete surface moist by using a water spraying, wet cloth covering or sprayer mode, and the sprayed concrete curing in the step six is used for preventing the premature evaporation of water and controlling the temperature of the concrete to be in a proper range.
In this embodiment: after the preliminary excavation of dismantling the hole is carried out through the drilling and splitting method, the subsequent careful excavation mode is carried out through the step method, the construction efficiency is guaranteed, the safety of subsequent construction can be guaranteed, sufficient preparation work is carried out before excavation, the protection surrounding barrier is built around the dismantling position, warning marks are arranged, sundries around the TBM are removed, auxiliary facilities around the TBM are removed, protection measures are arranged, the construction safety is improved, meanwhile, the ballast loading of the excavator is adopted, the construction efficiency is further improved through the dump truck, the influence on the construction efficiency caused by the accumulation of cleaning slag is avoided, meanwhile, the reinforcing mesh and the sprayed concrete are adopted for supporting, the stability of dismantling the hole is greatly improved, the firmness of dismantling the hole is further improved, the construction quality is improved, in addition, the surrounding environment is monitored through the surrounding structure deformation monitoring instrument, the vibration monitoring instrument and the noise monitoring instrument, and the safety of dismantling construction and the stability of surrounding buildings are guaranteed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The construction method for the excavation supporting of the detachable hole is characterized by comprising the following steps of: the method comprises the following steps:
firstly, dismantling hole excavation preparation work, reasonably arranging and preparing surrounding environments before dismantling hole excavation, firstly removing sundries around a TBM, removing auxiliary facilities around the TBM, setting protective measures, setting up protective fence around the dismantling hole excavation position, setting a warning sign, and reserving a pilot pit platform in advance in a hidden excavation section;
step two, carrying out preliminary excavation of a disassembly hole by adopting a drilling and splitting method, uniformly arranging a plurality of drilling holes at the excavation position of the disassembly hole through a drilling machine, loading explosive into a pre-designed explosive package after the drilling, installing a detonating device through a firing cable, igniting the firing cable, detonating the explosive, cracking and splitting rock, cracking and breaking the rock by shock waves and stress generated by blasting, forming a preliminary disassembly hole, loading slag through a digging machine, transporting the slag by a self-discharging automobile, and cleaning broken stone and slag soil in the preliminary disassembly hole;
step three, performing excavation construction by adopting a step method, namely determining the height and the width of each step by setting elevation on a preliminary disassembly hole, performing excavation of the first step by using an excavator, excavating downwards layer by layer, ensuring that the height and the gradient of each step meet design requirements, cleaning an excavation surface after the excavation of each step is completed, and performing leveling treatment to complete the excavation construction of the disassembly hole;
step four, performing construction monitoring in the process of dismantling the hole excavation, and performing real-time monitoring on vibration, displacement, noise and the like generated in the step two and the step three by installing a monitoring instrument at the position of dismantling the hole excavation;
step five, adopting drilling, splitting and digging construction at the non-explosive digging position of the dismounting hole, forming a new temporary face by continuously biting and drilling holes in the middle part of the face or along the periphery of the outer contour of the dismounting hole, drilling holes on the face by using a down-the-hole drill, putting a splitting machine into a splitting machine to break rock after drilling, loading and breaking layer by layer from the vicinity of the created temporary face, and carrying out secondary breaking by using a breaking hammer to break the temporary face into reasonable blocks, and carrying out ballast transportation by a dump truck;
step six, reinforcing mesh construction and shotcrete support:
s1, before construction of sprayed concrete and a reinforcing mesh, cleaning a sprayed surface, so that loose rock blocks and virtual slag accumulation on a wall foot are avoided on the sprayed surface, rotating the reinforcing mesh on the sprayed surface, and inserting the bottom of the reinforcing mesh into the bottom of the inner wall of a disassembly hole;
s2, selecting 42.5-grade ordinary silica cement, an accelerator, river sand and stone, stirring by adopting an automatic metering mixer, sequentially adding sieved sand, crushed stone and cement during construction, then adding water to start stirring, strictly grasping the specified accelerator mixing amount and concrete mixing ratio during stirring, controlling the water-cement ratio to be 1:2, and transporting the concrete mixture to a wet spraying machine by a concrete transporting vehicle after the concrete mixture is uniformly stirred;
s3, primary spraying firstly arches and then arches, secondary spraying firstly arches and then arches, spraying sequentially downwards and upwards, preventing rebound concrete from blocking an unsprayed rock face, and timely taking effective measures to carry out maintenance after the sprayed concrete is finally set for 2 hours, wherein the maintenance time is not less than 7d.
2. A method of constructing a demolition tunnel excavation support as claimed in claim 1, wherein: the first step is used for carrying out hidden or semi-hidden excavation work for avoiding subsidence of the earth surface or overlarge influence on the surrounding environment in the tunnel construction process, and the pilot tunnel platform is used for assisting in guiding and controlling the position and the direction of drilling or excavating equipment in the underground excavation process.
3. A method of constructing a demolition tunnel excavation support as claimed in claim 1, wherein: the step method in the step three is used for excavating steeper soil and stone slopes or cutting.
4. A method of constructing a demolition tunnel excavation support as claimed in claim 1, wherein: in the fifth step, the splitter drives the middle wedge block in the wedge block group to extend forwards through a huge pushing force generated by the ultrahigh oil pressure output by the hydraulic power station, and pushes the split blocks to expand towards two sides, so that a strong expansion force is generated on the hole wall to cause rock fracture.
5. A method of constructing a demolition tunnel excavation support as claimed in claim 1, wherein: in the step six, the reinforcing steel bar net is intensively processed in a reinforcing steel bar processing field, firstly, a reinforcing steel bar straightening machine is used for straightening reinforcing steel bars, then the reinforcing steel bars are cut into reinforcing steel bars, the reinforcing steel bar net is formed by welding, and before the reinforcing steel bars are welded, oil stains, paint stains, cement paste on the surface of the reinforcing steel bars, floating skin and rust which can be peeled off by hammering are cleaned and tested to be qualified; the processed reinforcing mesh should be flat, and the surface of the reinforcing steel bar has no flaws which weaken the section of the reinforcing steel bar.
6. A method of constructing a demolition tunnel excavation support as claimed in claim 1, wherein: and step six, the initial setting of the setting accelerator is not more than 5min, the final setting is not more than 10min, and the stone in the step six adopts hard broken stone.
7. A method of constructing a demolition tunnel excavation support as claimed in claim 1, wherein: and in the step six, the sprayed concrete curing mode is used for preventing premature evaporation of water and controlling the temperature of the concrete to be in a proper range.
8. A method of constructing a demolition tunnel excavation support as claimed in claim 1, wherein: the monitoring instrument in the fourth step is peripheral structure deformation monitoring instrument, vibration monitoring instrument and noise monitoring instrument, the monitoring instrument in the fourth step is used for monitoring the deformation condition of the peripheral building of dismantling the hole, the underground pipeline structure, the vibration monitoring instrument is used for monitoring the vibration condition that produces in the construction process of dismantling the hole to and the influence degree to peripheral structure and underground pipeline, the noise monitoring instrument is used for monitoring the noise condition that produces in the construction process of dismantling the hole, and the influence degree to the surrounding environment and personnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311342572.3A CN117345250A (en) | 2023-10-17 | 2023-10-17 | Construction method for removing hole excavation supporting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311342572.3A CN117345250A (en) | 2023-10-17 | 2023-10-17 | Construction method for removing hole excavation supporting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117345250A true CN117345250A (en) | 2024-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311342572.3A Pending CN117345250A (en) | 2023-10-17 | 2023-10-17 | Construction method for removing hole excavation supporting |
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| Country | Link |
|---|---|
| CN (1) | CN117345250A (en) |
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2023
- 2023-10-17 CN CN202311342572.3A patent/CN117345250A/en active Pending
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