CN113323668A - Method and device system for enlarging and digging hole chamber of underground storage with ultra-large section - Google Patents
Method and device system for enlarging and digging hole chamber of underground storage with ultra-large section Download PDFInfo
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- CN113323668A CN113323668A CN202110609548.6A CN202110609548A CN113323668A CN 113323668 A CN113323668 A CN 113323668A CN 202110609548 A CN202110609548 A CN 202110609548A CN 113323668 A CN113323668 A CN 113323668A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/03—Sinking shafts mechanically, e.g. by loading shovels or loading buckets, scraping devices, conveying screws
- E21D1/06—Sinking shafts mechanically, e.g. by loading shovels or loading buckets, scraping devices, conveying screws with shaft-boring cutters
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D13/00—Large underground chambers; Methods or apparatus for making them
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/04—Lining shafts; Linings therefor with brick, concrete, stone, or similar building materials
Abstract
The invention provides a method and a device system for enlarging and digging a cavity of an underground storage with an ultra-large section, wherein the method comprises the following steps: (1) drilling from the ground to the underground rock body in a forward direction to form a pilot hole communicated with the underground construction channel; (2) reversely expanding and excavating the pilot hole obtained in the step (1) to the ground to form a pipe well; (3) carrying out reverse excavation on the pipe well obtained in the step (2) for at least 1 time to form a vertical shaft corresponding to the height of the underground storage cavern; (4) performing reverse expanding excavation on the vertical shaft obtained in the step (3) for at least 1 time to form a well wall corresponding to the diameter of the underground storage cavern; (5) excavating the bottom of an underground storage cavern, and reinforcing the bottom, the top and a well wall of the underground storage cavern; (6) and reinforcing the pipe well between the earth surface and the top of the underground storage cavern. The excavation method provided by the invention has the advantages of small engineering quantity, safety, high efficiency and small damage to the structural stability of the cavern.
Description
Technical Field
The invention belongs to the technical field of underground cavern engineering construction, relates to a cavern expanding excavation method of an underground storage, and particularly relates to a method and a device system for the reverse well expanding excavation of the cavern of the underground storage with an ultra-large section.
Background
Natural gas is an important energy source required by current social production activities, and the demand of natural gas is increasing in countries around the world. China is a country with large energy consumption, the demand for natural gas is higher and higher, and in order to guarantee peak shaving use and national energy supply of natural gas, the natural gas reserve of each country in the world is continuously expanded. At present, the natural gas is stored mainly by three modes, namely ground gas storage tank storage, pipeline storage and underground gas storage. Because the amount of gas storage that ground gas holder and pipeline can provide is relatively limited, can not satisfy large-scale natural gas supply demand, and underground gas storage is the important guarantee that keeps natural gas normal use and national energy strategic reserve because of its advantages such as the gas storage volume is big, practice thrift ground resource, safe and reliable, little and not influenced by weather to environmental pollution.
The establishment of large underground natural gas storage groups is an important policy for the development of China, and large-section underground caverns need to be excavated in the stratum with good surrounding rocks. Considering the overall construction cost and the technical maturity, the volume of the underground cavern is generally more than 10 ten thousand cubic meters, the cavern structure adopts a cylinder, the diameter of the cavern is more than 35m, the height reaches about 100m, and the upper part and the lower part respectively adopt a hemispherical shape and an ellipsoidal shape so as to ensure that the gas storage can store natural gas with enough pressure in the operation period. The domestic scholars develop a great deal of research on the vertical cylindrical underground cavern excavation method, mainly adopt the ground positive shaft excavation, but the method is only suitable for the underground cavern excavation directly connected with the ground, and the chute arranged in the method is easy to block due to small diameter, so that the chute is difficult to dredge, and the dredging work risk is large. However, for the underground cavern deeply buried under the ground, on one hand, it is difficult to form an excavation working surface on the upper part of the cavern, and on the other hand, the amount of engineering for forcibly excavating from the ground is large, and the stability of the operation of the gas storage structure in the later period can be greatly influenced. In addition, the whole gas storage is buried in a stratum 100-200 m below the ground, and the section of the cavern of the gas storage is large, so that the cavern is difficult to directly excavate from the ground, namely, the positive well excavation is not suitable for the underground cavern of the underground storage with the super-large section. Therefore, the development of the excavation method which is small in engineering quantity, safe, efficient and small in damage to the stability of the cavern structure is of great significance.
Disclosure of Invention
The invention aims to provide a method and a device system for enlarging and digging a cavern of an underground storage with an ultra-large section in a reverse well manner.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a method for inverse well enlarging and digging of a cavern of an ultra-large section underground storage, which comprises the following steps:
(1) drilling from the ground to the underground rock body in a forward direction to form a pilot hole communicated with the underground construction channel;
(2) reversely expanding and excavating the pilot hole obtained in the step (1) to the ground to form a pipe well;
(3) carrying out reverse excavation on the pipe well obtained in the step (2) for at least 1 time to form a vertical shaft corresponding to the height of the underground storage cavern;
(4) performing reverse expanding excavation on the vertical shaft obtained in the step (3) for at least 1 time to form a well wall corresponding to the diameter of the underground storage cavern;
(5) excavating the bottom of an underground storage cavern, and reinforcing the bottom, the top and a well wall of the underground storage cavern;
(6) and reinforcing the pipe well between the ground and the top of the underground storage cavern.
In the present invention, the number of reverse diggings in step (3) is at least 1, and may be, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
In the present invention, the number of reverse diggings in step (4) is at least 1, and may be, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
The invention only needs one construction vertical shaft and one underground construction channel for deslagging in the whole excavation process of the underground storage cavern, has small whole excavation engineering quantity, does not have the problem of blockage of a pipe shaft, and has small deslagging quantity, less potential safety hazard and high construction speed.
Preferably, steps (1) - (3) are performed using a raise boring machine.
Preferably, steps (4) - (6) are performed using a lifting device and a construction platform.
Preferably, step (4) is performed using a drill and blast method.
The drilling and blasting method is a construction method for breaking rock mass and opening a cavern by blasting explosive, and comprises the following basic procedures: manual drilling, explosive charging and blasting, ventilation, necessary construction support and slag discharging and clearing field.
According to the method, by means of combination of the reverse well excavation and the drilling, blasting, expanding and excavating, on one hand, an excavation working surface is prevented from being formed between the ground and the top of the underground storage cavern, and on the other hand, the stability of the storage structure in the later use process is improved; the method is particularly suitable for excavating the cavern of the underground storage with the ultra-large section, is safe and efficient, and has small damage to the structural stability of the cavern.
Preferably, the drilling direction of the drilling and blasting method is a downward inclination angle of 40-50 °, such as 40 °, 41 °, 42 °, 43 °, 44 °, 45 °, 46 °, 47 °, 48 °, 49 ° or 50 °, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
In the invention, the downward inclination angle is an acute angle formed below a horizontal plane and between the horizontal plane and the downward inclination angle.
Preferably, the vertical pitch of the drilling and blasting method is 1-2m, and may be, for example, 1m, 1.1m, 1.2m, 1.3m, 1.4m, 1.5m, 1.6m, 1.7m, 1.8m, 1.9m or 2m, but is not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the temporary spraying and mixing treatment is carried out on the inner wall of the vertical shaft before each reverse reaming in the step (4).
In the invention, the temporary spraying and mixing treatment specifically comprises the step of spraying the mixture of water, cement, aggregate, admixture and the like to the surface of the excavated exposed surrounding rock by using compressed air so as to bond and solidify the surrounding rock. The method is characterized in that a mixture prepared according to a certain proportion is sprayed to a sprayed surface at a high speed through a pipeline by means of a spraying machine and compressed air, and a concrete layer is formed after the mixture is coagulated and hardened. The method can temporarily form sprayed concrete support for the surrounding rock, and the stability of the surrounding rock of the cavern is protected.
According to the invention, the temporary spraying and mixing treatment is carried out on the well wall before each reverse expanding excavation so as to ensure the surface strength of the inner wall of the vertical well, thereby improving the safety of the cavern and providing support for the subsequent drilling, blasting, expanding excavation.
Preferably, the ratio of the circumferential footage to the vertical footage of each reverse reaming in step (4) is in the range of 1 (2.5-3.5), and may be, for example, 1:2.5, 1:2.7, 1:2.9, 1:3, 1:3.1, 1:3.3 or 1:3.5, but not limited to the recited values, and other non-recited values in the range of the values are also applicable.
Preferably, the reinforcement treatment in the step (5) is concrete lining.
Preferably, the steel lining concrete is reinforced in a sectional layer-by-layer mode when the well wall is reinforced.
Preferably, the individual pitch height of the segment layer by layer is 18 to 22m, for example 18m, 18.5m, 19m, 19.5m, 20m, 20.5m, 21m, 21.5m or 22m, but is not limited to the recited values, and other values not listed in this range are equally applicable.
Preferably, the reinforcement treatment of step (6) is to arrange a conduit on the wall surface of the pipe well.
As a preferred technical solution of the first aspect of the present invention, the method comprises the steps of:
(1) a raise boring machine is adopted to drill from the ground to the underground rock body in a forward direction to form a pilot hole communicated with an underground construction channel;
(2) adopting a raise boring machine to reversely expand and dig the pilot hole obtained in the step (1) to the ground to form a pipe well;
(3) performing reverse expanding excavation on the pipe well obtained in the step (2) for at least 1 time by using a raise boring machine to form a vertical shaft corresponding to the height of the underground storage cavern;
(4) adopting a lifting device and a construction platform, and carrying out reverse expanding excavation on the vertical shaft obtained in the step (3) for at least 1 time by using a drilling and blasting method to form a well wall corresponding to the diameter of the underground storage cavern; the drilling direction of the drilling and blasting method is a downward inclination angle of 40-50 degrees, and the vertical row spacing is 1-2 m; carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft before each reverse expanding excavation, wherein the ratio range of the annular footage and the vertical footage of each reverse expanding excavation is 1 (2.5-3.5);
(5) excavating the bottom of an underground storage cavern by adopting a lifting device and a construction platform, and applying steel lining concrete to the bottom, the top and a well wall of the underground storage cavern; the steel lining concrete adopts a sectional layer-by-layer mode when reinforcing the well wall, and the height of a single section is 18-22 m;
(6) and a conduit is arranged on the wall surface of the pipeline well between the ground and the top of the underground storage cavern.
In a second aspect, the invention provides a device system for performing hole chamber raise and enlarging excavation on an ultra-large section underground storage by using the method in the first aspect, wherein the device system comprises a raise boring machine, a lifting device and a construction platform.
The raise boring machine is arranged at a ground opening of the underground storage cavern and is used for forward drilling from the ground into an underground rock body to form a pilot hole communicated with the underground construction channel, a pipeline well formed by reverse expanding excavation and a vertical well corresponding to the height of the underground storage cavern.
The lifting device is used for replacing the raise boring machine, is arranged at a ground opening of an underground storage cavern, and is connected with a construction platform arranged in the shaft through the pipe shaft.
The construction platform is used as a load-bearing carrier.
Preferably, the construction platform adopts a detachable steel frame structure.
Preferably, the radial length of the construction platform is adapted to the circumferential footage of each reverse expanding excavation.
In the invention, the concrete meaning that the radial length of the construction platform is matched with the annular advancing ruler of each reverse expanding excavation is as follows: the radial length of the construction platform is lengthened along with the increase of the circumferential footage size of reverse footage excavation at each time, so that drilling, blasting and footage excavation in the circumferential footage process of the vertical shaft is facilitated.
Preferably, the construction platform has a circumferential rotation function with respect to the shaft.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method provided by the invention only needs one construction vertical shaft and one underground construction channel for deslagging in the whole excavation process of the underground storage cavern, so that the whole excavation engineering quantity is small, the problem of blockage of a pipe well does not exist, the slag skimming quantity is small, the potential safety hazard is less, and the construction speed is high;
(2) according to the method, by means of a mode of combining the raise excavation and the drilling, blasting and expanding excavation, on one hand, an excavation working surface is prevented from being formed between the ground and the top of the underground storage cavern, and on the other hand, the stability of the storage structure in the later use process is improved; the method is particularly suitable for excavating the cavern of the underground storage with the ultra-large section, is safe and efficient, and has small damage to the structural stability of the cavern.
Drawings
FIG. 1 is a schematic diagram of a method for cavity-reversing and enlarging excavation of an ultra-large section underground storage provided by the invention;
fig. 2 is a schematic structural diagram of an ultra-large section underground storage cavern finally formed by the method provided by the invention.
Wherein: 1-raise boring machine; 2-pilot hole; 3-a pipe well; 4-a vertical shaft; 5, constructing a channel underground; 6-a lifting device; 7-construction of a platform; 8-underground storage cavern; 9-conduit.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The invention provides a device system for the raise-hole enlarging and digging of an underground storage cavern with an ultra-large section, which comprises a raise-hole drilling machine 1, a lifting device 6, a construction platform 7, a small drilling machine, an explosion detonator and the like, as shown in figures 1 and 2; the raise boring machine 1 is arranged at a ground opening of an underground storage cavern 8 and is used for forward drilling from the ground into an underground rock body to form a pilot hole 2 communicated with an underground construction channel 5, a pipeline well 3 formed by reverse expanding excavation and a vertical shaft 4 corresponding to the height of the underground storage cavern 8; the lifting device 6 is used for replacing the raise boring machine 1, is arranged at a ground opening of an underground storage cavern 8, and is connected with a construction platform 7 arranged in the vertical shaft 4 through the pipe shaft 3; the construction platform 7 serves as a load carrier.
Example 1
The embodiment provides a method for performing hole chamber reversal and expanding excavation on an ultra-large section underground storage by using the device system, as shown in fig. 1 and fig. 2, the method comprises the following steps:
(1) a raise boring machine 1 is adopted to drill from the ground to the underground rock mass in a forward direction to form a pilot hole 2 with phi 244mm communicated with an underground construction channel 5, the underground construction channel 5 (with the width multiplied by the height: 6.0m multiplied by 6.0m) is expanded and excavated to the interface position of the pilot hole 2, an intersection portal frame (not shown in the figure) is erected, and construction is continued to the side wall according to the outline (with the width multiplied by the height: 7.5m multiplied by 6.0m) of the underground construction channel 5;
(2) adopting a raise boring machine 1 to reversely expand and dig the pilot hole 2 obtained in the step (1) to the ground along the direction from bottom to top to form a phi 1500mm pipe well 3 for subsequently arranging a guide pipe 9 to communicate an underground storage chamber 8 with the ground;
(3) adopting a raise boring machine 1 to reversely dig the pipe shaft 3 obtained in the step (2) for 2 times along the direction from bottom to top to form a vertical shaft 4 with phi 5000mm corresponding to the height of an underground storage chamber 8, wherein the annular footage is shown as a section a in the figure 1;
(4) removing the raise boring machine 1, arranging a lifting device 6 on the installation position of the original raise boring machine 1, and arranging a construction platform 7 connected with the lifting device 6 in the vertical shaft 4 obtained in the step (3) so as to pull the construction platform 7 to do lifting movement in the vertical shaft 4; temporary spraying and mixing treatment is carried out on the inner wall of the vertical shaft 4 by adopting a lifting device 6 and a construction platform 7 and utilizing manpower; carrying out 4 times of reverse expanding excavation from bottom to top and from inside to outside on the vertical shaft 4 by using a drilling and blasting method to form a well wall corresponding to an underground storage chamber 8 with the diameter of 35m, wherein the annular footage is shown as sections b, c, d and e in the figure 1; the inner wall of the vertical shaft 4 is subjected to temporary spraying and mixing treatment before reverse expanding excavation, the circumferential footage at each time is designed to be 3.75m, after all blast holes are constructed in a vertical mode, charging blasting is carried out in multiple times, the vertical footage is 11m during each blasting, the drilling direction of the drilling and blasting method is 45 degrees of declination angle, and the vertical row pitch is 1.5 m;
(5) excavating the bottom of the underground storage cavern 8 by adopting a lifting device 6 and a construction platform 7, and applying steel lining concrete to the bottom of the underground storage cavern 8; steel lining concrete is applied to the wall of the underground storage cavern 8 in sections from bottom to top layer by layer, and the height of each section is 20 m;
(6) to setting up pipe 9 on the pipe shaft 3 wall between 8 tops in ground and the underground storage cavern, the concrete operation is: firstly, transfer construction platform 7 to place the pipe on construction platform 7, then be connected construction platform 7 and hoisting device 6, draw up construction platform 7 through hoisting device 6, make pipe 9 on the construction platform 7 insert in pipe shaft 3 and stretch out ground, it is fixed with pipe 9 in the lump when utilizing underground storage cavern 8 top to apply steel lining concrete again, demolish hoisting device 6 and construction platform 7 at last, form the diameter and be 35 m's super large section underground storage cavern 8.
Example 2
The embodiment provides a method for performing hole chamber reversal and expanding excavation on an ultra-large section underground storage by using the device system, as shown in fig. 1 and fig. 2, the method comprises the following steps:
(1) a raise boring machine 1 is adopted to drill from the ground to the underground rock body in a forward direction to form a pilot hole 2 with the diameter of 250mm communicated with an underground construction channel 5, the underground construction channel 5 (the width multiplied by the height: 6.0m multiplied by 6.0m) is expanded and excavated to the interface position of the pilot hole 2, an intersection portal frame (not shown in the figure) is erected, and construction is continued to the side wall according to the outline (the width multiplied by the height: 7.5m multiplied by 6.0m) of the underground construction channel 5;
(2) adopting a raise boring machine 1 to reversely expand and dig the pilot hole 2 obtained in the step (1) to the ground along the direction from bottom to top to form a phi 2000mm pipe well 3 for subsequently arranging a guide pipe 9 to communicate an underground storage chamber 8 with the ground;
(3) adopting a raise boring machine 1 to reversely dig the pipe shaft 3 obtained in the step (2) for 1 time along the direction from bottom to top to form a vertical shaft 4 with phi 4400mm corresponding to the height of the underground storage chamber 8, and circularly advancing to a section a in the figure 1;
(4) removing the raise boring machine 1, arranging a lifting device 6 on the installation position of the original raise boring machine 1, and arranging a construction platform 7 connected with the lifting device 6 in the vertical shaft 4 obtained in the step (3) so as to pull the construction platform 7 to do lifting movement in the vertical shaft 4; temporary spraying and mixing treatment is carried out on the inner wall of the vertical shaft 4 by adopting a lifting device 6 and a construction platform 7 and utilizing manpower; carrying out 4 times of reverse expanding excavation from bottom to top and from inside to outside on the vertical shaft 4 by using a drilling and blasting method to form a well wall corresponding to the underground storage cavern 8 with the diameter of 40m, wherein the circular direction of the well wall is advanced as sections b, c, d and e in the figure 1; the inner wall of the vertical shaft 4 is subjected to temporary spraying and mixing treatment before reverse expanding excavation, the circumferential footage at each time is designed to be 4.45m, after all blast holes are constructed in a vertical mode, charging blasting is carried out in multiple times, the vertical footage is 11m during each blasting, the drilling direction of the drilling and blasting method is a downward inclination angle of 40 degrees, and the vertical row spacing is 2 m;
(5) excavating the bottom of the underground storage cavern 8 by adopting a lifting device 6 and a construction platform 7, and applying steel lining concrete to the bottom of the underground storage cavern 8; steel lining concrete is applied to the wall of the underground storage cavern 8 section by section along the direction from bottom to top, and the height of a single section is 18 m;
(6) to setting up pipe 9 on the pipe shaft 3 wall between 8 tops in ground and the underground storage cavern, the concrete operation is: firstly, put construction platform 7 down, and place the pipe on construction platform 7, then be connected construction platform 7 and hoisting device 6, pull up construction platform 7 through hoisting device 6, make pipe 9 on the construction platform 7 insert in pipe shaft 3 and stretch out ground, it is fixed with pipe 9 in the lump when utilizing underground storage cavern 8 top to apply steel lining concrete again, demolish hoisting device 6 and construction platform 7 at last, form the diameter and be 40 m's super large section underground storage cavern 8.
Example 3
The embodiment provides a method for performing hole chamber reversal and expanding excavation on an ultra-large section underground storage by using the device system, as shown in fig. 1 and fig. 2, the method comprises the following steps:
(1) a raise boring machine 1 is adopted to drill from the ground to the underground rock body in a forward direction to form a pilot hole 2 with the diameter of 250mm communicated with an underground construction channel 5, the underground construction channel 5 (the width multiplied by the height: 6.0m multiplied by 6.0m) is expanded and excavated to the interface position of the pilot hole 2, an intersection portal frame (not shown in the figure) is erected, and construction is continued to the side wall according to the outline (the width multiplied by the height: 7.5m multiplied by 6.0m) of the underground construction channel 5;
(2) adopting a raise boring machine 1 to reversely expand and dig the pilot hole 2 obtained in the step (1) to the ground along the direction from bottom to top to form a phi 2500mm pipe well 3 for subsequently arranging a guide pipe 9 to communicate an underground storage chamber 8 with the ground;
(3) adopting a raise boring machine 1 to reversely dig the pipe shaft 3 obtained in the step (2) for 2 times along the direction from bottom to top to form a vertical shaft 4 with phi 5000mm corresponding to the height of an underground storage chamber 8, wherein the annular footage is shown as a section a in the figure 1;
(4) removing the raise boring machine 1, arranging a lifting device 6 on the installation position of the original raise boring machine 1, and arranging a construction platform 7 connected with the lifting device 6 in the vertical shaft 4 obtained in the step (3) so as to pull the construction platform 7 to do lifting movement in the vertical shaft 4; temporary spraying and mixing treatment is carried out on the inner wall of the vertical shaft 4 by adopting a lifting device 6 and a construction platform 7 and utilizing manpower; carrying out 4 times of reverse expanding excavation from bottom to top and from inside to outside on the vertical shaft 4 by using a drilling and blasting method to form a well wall corresponding to the underground storage chamber 8 with the diameter of 45m, wherein the circular direction of the well wall is advanced as sections b, c, d and e in the figure 1; the inner wall of the vertical shaft 4 is subjected to temporary spraying and mixing treatment before reverse expanding excavation at each time, the circumferential footage at each time is designed to be 5m, after all blast holes are constructed vertically at one time, charging blasting is carried out in several times, the vertical footage during each blasting is 17.5m, the drilling direction of the drilling and blasting method is 50 degrees of downward inclination, and the vertical row pitch is 1 m;
(5) excavating the bottom of the underground storage cavern 8 by adopting a lifting device 6 and a construction platform 7, and applying steel lining concrete to the bottom of the underground storage cavern 8; steel lining concrete is applied to the wall of the underground storage cavern 8 section by section along the direction from bottom to top, and the height of a single section is 22 m;
(6) to setting up pipe 9 on the pipe shaft 3 wall between 8 tops in ground and the underground storage cavern, the concrete operation is: firstly, transfer construction platform 7 to place the pipe on construction platform 7, then be connected construction platform 7 and hoisting device 6, pull up construction platform 7 through hoisting device 6, make pipe 9 on the construction platform 7 insert in pipe shaft 3 and stretch out ground, it is fixed with pipe 9 in the lump when utilizing underground storage cavern 8 top to apply steel lining concrete again, demolish hoisting device 6 and construction platform 7 at last, form the diameter and be 45 m's super large section underground storage cavern 8.
In the examples 1-3, the underground storage cavern with the ultra-large section and the diameter of 35-45m is excavated in a reverse well expanding excavation mode, and the expected aim is fulfilled.
Therefore, the method provided by the invention only needs one construction vertical shaft and one underground construction channel for deslagging in the whole excavation process of the underground storage cavern, so that the whole excavation engineering quantity is small, the problem of blockage of a pipeline well does not exist, the deslagging quantity is small, the potential safety hazard is less, and the construction speed is high; in addition, the method provided by the invention has the advantages that by means of combination of the raise excavation and the drilling, blasting and expanding excavation, on one hand, an excavation working surface is prevented from being formed between the ground and the top of the underground storage cavern, and on the other hand, the stability of the storage structure in the later use process is improved; the method is particularly suitable for excavating the cavern of the underground storage with the ultra-large section, is safe and efficient, and has small damage to the structural stability of the cavern.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A method for enlarging and digging a cavity of an ultra-large section underground storage in a reverse well manner is characterized by comprising the following steps:
(1) drilling from the ground to the underground rock body in a forward direction to form a pilot hole communicated with the underground construction channel;
(2) reversely expanding and excavating the pilot hole obtained in the step (1) to the ground to form a pipe well;
(3) carrying out reverse excavation on the pipe well obtained in the step (2) for at least 1 time to form a vertical shaft corresponding to the height of the underground storage cavern;
(4) performing reverse expanding excavation on the vertical shaft obtained in the step (3) for at least 1 time to form a well wall corresponding to the diameter of the underground storage cavern;
(5) excavating the bottom of an underground storage cavern, and reinforcing the bottom, the top and a well wall of the underground storage cavern;
(6) and reinforcing the pipe well between the ground and the top of the underground storage cavern.
2. The method of claim 1, wherein steps (1) - (3) are performed with a raise boring machine;
preferably, steps (4) - (6) are performed using a lifting device and a construction platform.
3. The method according to claim 1 or 2, wherein step (4) is performed using a drill-and-blast method;
preferably, the drilling direction of the drilling and blasting method is a downward inclination angle of 40-50 degrees;
preferably, the vertical row pitch of the drilling and blasting method is 1-2 m.
4. The method according to any one of claims 1 to 3, wherein step (4) comprises subjecting the interior wall of the shaft to a temporary jet-mixing treatment prior to each reverse reaming.
5. The method according to any one of claims 1 to 4, wherein the ratio of the circumferential footage to the vertical footage of each reverse reaming in step (4) is in the range of 1 (2.5-3.5).
6. The method according to any one of claims 1 to 5, wherein the reinforcement treatment of step (5) is in particular the application of steel-lined concrete;
preferably, the steel lining concrete adopts a sectional layer-by-layer mode when reinforcing the well wall;
preferably, the height of the single section of the section layer by layer is 18-22 m.
7. The method according to any one of claims 1 to 6, wherein the reinforcement treatment of step (6) is embodied by providing a conduit on the wall of the pipe well.
8. The method according to any one of claims 1-7, characterized in that the method comprises the steps of:
(1) a raise boring machine is adopted to drill from the ground to the underground rock body in a forward direction to form a pilot hole communicated with an underground construction channel;
(2) adopting a raise boring machine to reversely expand and dig the pilot hole obtained in the step (1) to the ground to form a pipe well;
(3) performing reverse expanding excavation on the pipe well obtained in the step (2) for at least 1 time by using a raise boring machine to form a vertical shaft corresponding to the height of the underground storage cavern;
(4) adopting a lifting device and a construction platform, and carrying out reverse expanding excavation on the vertical shaft obtained in the step (3) for at least 1 time by using a drilling and blasting method to form a well wall corresponding to the diameter of the underground storage cavern; the drilling direction of the drilling and blasting method is a downward inclination angle of 40-50 degrees, and the vertical row spacing is 1-2 m; carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft before each reverse expanding excavation, wherein the ratio range of the annular footage and the vertical footage of each reverse expanding excavation is 1 (2.5-3.5);
(5) excavating the bottom of an underground storage cavern by adopting a lifting device and a construction platform, and applying steel lining concrete to the bottom, the top and a well wall of the underground storage cavern; the steel lining concrete adopts a sectional layer-by-layer mode when reinforcing the well wall, and the height of a single section is 18-22 m;
(6) and a conduit is arranged on the wall surface of the pipeline well between the ground and the top of the underground storage cavern.
9. An apparatus system for performing the raise-hole enlarging excavation of the cavern of the ultra-large-section underground storage by using the method as claimed in any one of claims 1 to 8, wherein the apparatus system comprises a raise-hole drilling machine, a lifting device and a construction platform;
the raise boring machine is arranged at a ground opening of the underground storage cavern and is used for forward drilling from the ground into an underground rock body to form a pilot hole communicated with the underground construction channel, a pipeline well formed by reverse expanding excavation and a vertical well corresponding to the height of the underground storage cavern;
the lifting device is used for replacing the raise boring machine, is arranged at a ground opening of an underground storage cavern, and is connected with a construction platform arranged in the shaft through the pipeline well;
the construction platform is used as a load-bearing carrier.
10. The apparatus system of claim 9, wherein the construction platform is a removable steel frame structure;
preferably, the radial length of the construction platform is adapted to the circumferential footage of each reverse expanding excavation;
preferably, the construction platform has a circumferential rotation function with respect to the shaft.
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