CN113323668B - Method and device system for reverse well expansion and excavation of oversized-section underground reservoir chamber - Google Patents
Method and device system for reverse well expansion and excavation of oversized-section underground reservoir chamber Download PDFInfo
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- CN113323668B CN113323668B CN202110609548.6A CN202110609548A CN113323668B CN 113323668 B CN113323668 B CN 113323668B CN 202110609548 A CN202110609548 A CN 202110609548A CN 113323668 B CN113323668 B CN 113323668B
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- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000009412 basement excavation Methods 0.000 title claims abstract description 52
- 238000010276 construction Methods 0.000 claims abstract description 80
- 238000003860 storage Methods 0.000 claims abstract description 71
- 238000005553 drilling Methods 0.000 claims abstract description 59
- 239000011435 rock Substances 0.000 claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 10
- 239000004567 concrete Substances 0.000 claims description 21
- 238000005422 blasting Methods 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 12
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000005474 detonation Methods 0.000 claims 1
- 238000005728 strengthening Methods 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 22
- 239000007789 gas Substances 0.000 description 11
- 239000003345 natural gas Substances 0.000 description 11
- 239000002893 slag Substances 0.000 description 5
- 239000002360 explosive Substances 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 238000007630 basic procedure Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D13/00—Large underground chambers; Methods or apparatus for making them
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention provides a method and a device system for reverse well expansion and excavation of an oversized-section underground reservoir chamber, wherein the method comprises the following steps: (1) Forward drilling from the ground into the underground rock mass to form a pilot hole communicated with an underground construction channel; (2) Reversely enlarging and excavating the pilot hole obtained in the step (1) to the ground to form a pipeline well; (3) Performing reverse excavation on the pipeline well obtained in the step (2) for at least 1 time to form a vertical shaft corresponding to the height of the underground reservoir cavity; (4) Performing reverse 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 reservoir cavity; (5) Excavating the bottom of an underground storage cavern, and reinforcing the bottom, the top and the well wall of the underground storage cavern; (6) And reinforcing the pipeline well between the 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 cavity.
Description
Technical Field
The invention belongs to the technical field of underground cavern engineering construction, relates to a method for expanding and excavating an underground storage cavern, and particularly relates to a method for expanding and excavating an extra-large-section underground storage cavern reverse well and a device system thereof.
Background
Natural gas is an important energy source required for the production activities of the society today, and the demand of natural gas is increasing in all countries of the world. The natural gas supply system is a large country of energy consumption, the demand for natural gas is also higher and higher, and in order to ensure the peak shaving use of natural gas and the national energy supply, the natural gas reserve of the country is continuously expanded all over the world. At present, three modes of ground gas storage tank storage, pipeline storage and underground gas storage are mainly adopted for storing natural gas. Because the ground gas storage tank and the pipeline can provide limited gas storage capacity, the requirement of large-scale natural gas supply cannot be met, and the underground gas storage tank has the advantages of large gas storage capacity, ground resource conservation, safety, reliability, small environmental pollution, no influence of weather and the like, and is an important guarantee for maintaining normal use of natural gas and national energy strategy storage.
The establishment of a large underground natural gas storage group is an important policy for development in China, and a large-section underground cavity is required to be excavated in a stratum with good surrounding rock. Considering the overall construction cost and the technical maturity, the volume of the underground cavity is generally more than 10 ten thousand cubic meters, the cavity structure adopts a cylinder, the cavity diameter 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 researches on the vertical cylindrical underground cavity excavation method, mainly adopts the ground positive well excavation, but the method is only suitable for excavating the underground cavity directly connected with the ground, and the slag sliding well arranged in the vertical cylindrical underground cavity excavation method is easy to be blocked due to small diameter, so that the slag sliding well is difficult to dredge, and the dredging working danger is high. However, for underground caverns buried deeply below the ground, on one hand, an excavation working face is difficult to form at the upper part of the caverns, on the other hand, the forced excavation engineering amount from the ground is large, and the stability of operation of a gas storage structure can be greatly influenced in the later period. In addition, because the whole gas storage is buried in the stratum 100m-200m below the ground, and the cross section of the gas storage cavity is larger, the gas storage cavity is difficult to excavate directly from the ground, namely, the positive well excavation is not suitable for the underground storage cavity with the oversized cross section. Therefore, the development of the excavation method which is small in engineering quantity, safe, efficient and small in damage to the structural stability of the cavern has very important significance.
Disclosure of Invention
The invention aims to provide a method for reverse well expansion and excavation of an oversized-section underground reservoir chamber and a device system thereof, wherein the method has the advantages of small engineering quantity, safety, high efficiency and small damage to the structural stability of the chamber.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the invention provides a method for reverse well expansion and excavation of an oversized-section underground storage cavern, the method comprising the steps of:
(1) Forward drilling from the ground into the underground rock mass to form a pilot hole communicated with an underground construction channel;
(2) Reversely enlarging and excavating the pilot hole obtained in the step (1) to the ground to form a pipeline well;
(3) Performing reverse excavation on the pipeline well obtained in the step (2) for at least 1 time to form a vertical shaft corresponding to the height of the underground reservoir cavity;
(4) Performing reverse 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 reservoir cavity;
(5) Excavating the bottom of an underground storage cavern, and reinforcing the bottom, the top and the well wall of the underground storage cavern;
(6) And reinforcing the pipeline well between the ground and the top of the underground storage cavern.
In the present invention, the number of times of reverse expansion in the step (3) is at least 1, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 times, but not limited to the recited values, and other non-recited values within the range are equally applicable.
In the present invention, the number of times of reverse expansion in the step (4) is at least 1, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 times, but not limited to the recited values, and other non-recited values within the range are equally applicable.
The invention only needs one construction shaft and one underground construction channel for slag discharge in the whole excavation process of the underground storage cavern, has small whole excavation engineering quantity, no pipeline well blockage problem, small slag skimming quantity, less potential safety hazard and high construction speed.
Preferably, steps (1) - (3) are performed using a backdrilling machine.
Preferably, steps (4) - (6) are performed using a lifting device and a construction platform.
Preferably, step (4) is performed using a drill-burst method.
The invention relates to a drilling and blasting method, in particular to a construction method for breaking rock mass and opening a cavity by adopting explosive blasting, which comprises the following basic procedures: manual drilling, explosive loading and blasting, ventilation, necessary construction support and slag discharging and cleaning.
According to the invention, through a mode of combining reverse well excavation and drilling, explosion and expanding excavation, on one hand, an excavation working surface is prevented from being formed between the ground and the top of an underground reservoir cavity, and on the other hand, the stability of a reservoir structure in the later use process is improved; the method is particularly suitable for excavating the underground storage cavern with the ultra-large section, is safe and efficient, and has little damage to the structural stability of the cavern.
The drilling direction of the drilling and blasting method is preferably a downward inclination angle of 40 ° -50 °, for example, 40 °, 41 °, 42 °, 43 °, 44 °, 45 °, 46 °, 47 °, 48 °, 49 °, or 50 °, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
In the invention, the downward inclination angle is an acute angle below the horizontal plane and clamped with the horizontal plane.
Preferably, the vertical row distance of the drill and burst method is 1-2m, 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 non-recited values within the range of values are equally applicable.
Preferably, the step (4) carries out temporary spraying and mixing treatment on the inner wall of the vertical shaft before each reverse expansion and excavation.
In the invention, the temporary spraying and mixing treatment is specifically to spray the mixture of water, cement, aggregate, additive and the like to the surface of the excavated exposed surrounding rock by adopting compressed air, so that the surface of the excavated exposed surrounding rock is cemented and solidified. The method uses spraying machinery and compressed air to spray the mixed material prepared according to a certain proportion to the sprayed surface at high speed through a pipeline, and the mixed material is coagulated and hardened to form a concrete layer. The method can temporarily form shotcrete support for surrounding rocks and protect the stability of the surrounding rocks of the grotto.
According to the invention, the temporary spraying and mixing treatment is carried out on the well wall before each reverse expansion and excavation so as to ensure the surface strength of the inner wall of the vertical shaft, thereby improving the safety of a grotto and providing support for subsequent drilling, blasting and expansion and excavation.
Preferably, the ratio of the circumferential footage to the vertical footage of each reverse expansion 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 is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, the reinforcement treatment of step (5) is specifically the application of steel lined concrete.
Preferably, the steel lining concrete adopts a segmented and layer-by-layer mode when reinforcing the well wall.
Preferably, the single-node height of the sections layer by layer is 18-22m, 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 non-recited values within the range of values are equally applicable.
Preferably, the reinforcement treatment in step (6) is specifically to provide a conduit on the wall surface of the piping well.
As a preferred technical solution of the first aspect of the present invention, the method includes the following steps:
(1) Adopting a reverse well drilling machine to drill forward from the ground into the underground rock mass to form a pilot hole communicated with an underground construction channel;
(2) Performing reverse expansion digging on the pilot hole obtained in the step (1) to the ground by adopting a reverse well drilling machine to form a pipeline well;
(3) Performing reverse expansion digging on the pipeline well obtained in the step (2) for at least 1 time by adopting a reverse well drilling machine to form a vertical shaft corresponding to the height of the underground reservoir cavity;
(4) Adopting a lifting device and a construction platform, and performing reverse 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 a cavity of an underground reservoir; the drilling direction of the drilling and blasting method is a downward inclination angle of 40-50 degrees, and the vertical row spacing is 1-2m; carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft before each reverse expansion, wherein the ratio of the circumferential footage to the vertical footage of each reverse expansion 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 mode of sections and layers when reinforcing the well wall, and the height of a single section is 18-22m;
(6) And a conduit is arranged on the wall surface of the pipeline between the ground and the top of the underground storage chamber.
In a second aspect, the invention provides a device system for performing reverse well expansion and excavation of an oversized-section underground reservoir cavity by using the method in the first aspect, wherein the device system comprises a reverse well drilling machine, a lifting device and a construction platform.
The well reversing drilling machine is arranged at the ground opening of the underground storage chamber and is used for forward drilling from the ground into the underground rock body to form a pilot hole communicated with the underground construction channel, a pipeline well formed by reverse expansion and excavation and a vertical shaft corresponding to the height of the underground storage chamber.
The lifting device is used for replacing the reverse well drilling machine, is arranged at the ground opening of the underground storage chamber, and is connected with a construction platform arranged in the vertical shaft through the pipeline well.
The construction platform serves as a load 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 expansion.
In the invention, the specific meaning of the radial length of the construction platform adapting to the circumferential footage of each reverse expansion is as follows: the radial length of the construction platform is lengthened along with the increase of the size of the annular ruler for each reverse expanding excavation, so that the drilling, explosion and expanding excavation of the vertical shaft in the annular ruler process are 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 shaft and one underground construction channel for deslagging in the excavation process of the whole underground storage cavern, the whole excavation engineering amount is small, the problem of blockage of a pipeline well is avoided, the deslagging amount is small, the potential safety hazard is low, and the construction speed is high;
(2) According to the method provided by the invention, through a mode of combining inverted well excavation and drilling, explosion and expanding excavation, on one hand, an excavation working surface is prevented from being formed between the ground and the top of an underground reservoir cavity, and on the other hand, the stability of a reservoir structure in the later use process is improved; the method is particularly suitable for excavating the underground storage cavern with the ultra-large section, is safe and efficient, and has little damage to the structural stability of the cavern.
Drawings
FIG. 1 is a schematic diagram of a method for reverse well expansion and excavation of an oversized-section underground reservoir chamber provided by the invention;
FIG. 2 is a schematic diagram of the structure of an oversized-section underground storage cavern finally formed by the method provided by the invention.
Wherein: 1-a reverse well drilling machine; 2-pilot holes; 3-piping well; 4-shaft; 5-an underground construction channel; 6-lifting means; 7-a construction platform; 8-an underground storage cavern; 9-catheter.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
The invention provides a device system for reverse well expansion and excavation of an oversized-section underground reservoir chamber, which is shown in fig. 1 and 2, and comprises a reverse well drilling machine 1, a lifting device 6, a construction platform 7, a small drilling machine, a blasting detonator and the like; the reverse well drilling machine 1 is arranged at the ground opening of the underground storage cavern 8 and is used for drilling forward from the ground into the underground rock body to form a pilot hole 2 communicated with the underground construction channel 5, a pipeline well 3 formed by reverse expansion and 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 reverse well drilling machine 1, is arranged at a ground opening of an underground storage chamber 8, and is connected with a construction platform 7 arranged in the vertical shaft 4 through the pipeline well 3; the construction platform 7 serves as a load carrier.
Example 1
The embodiment provides a method for performing reverse well expansion and excavation of an oversized-section underground reservoir cavity by adopting the device system, as shown in fig. 1 and 2, the method comprises the following steps:
(1) Adopting a reverse well drilling machine 1 to drill forward from the ground into an underground rock mass to form a phi 244mm pilot hole 2 communicated with an underground construction channel 5, enlarging and digging the underground construction channel 5 (width x height: 6.0m x 6.0 m) to the interface position of the pilot hole 2, erecting an intersection portal (not shown in the figure), and continuing to construct to the side wall according to the outline (width x height: 7.5m x 6.0 m) of the underground construction channel 5;
(2) The pilot hole 2 obtained in the step (1) is reversely dug to the ground along the direction from bottom to top by adopting a reverse well drilling machine 1 to form a phi 1500mm pipeline well 3 for the subsequent arrangement of a conduit 9 so as to communicate an underground reservoir cavity 8 with the ground;
(3) 2 times of reverse expansion digging is carried out on the pipeline well 3 obtained in the step (2) along the direction from bottom to top by adopting a reverse well drilling machine 1, so as to form a phi 5000mm vertical shaft 4 corresponding to the height of an underground storage chamber 8, and the circumferential footage of the vertical shaft is as in section a in fig. 1;
(4) Withdrawing the back-well drilling machine 1, arranging a lifting device 6 on the installation position of the original back-well drilling 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 motion in the vertical shaft 4; adopting a lifting device 6 and a construction platform 7 and carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft 4 manually; the vertical shaft 4 is reversely excavated from bottom to top for 4 times from inside to outside by using a drilling and blasting method, so as to form a well wall corresponding to an underground reservoir cavity 8 with the diameter of 35m, and the circumferential footage of the well wall is as b, c, d, e in fig. 1; carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft 4 before each reverse expansion, designing the circumferential footage of 3.75m each time, carrying out explosive charging blasting in batches after finishing all blast holes are constructed vertically once, and carrying out vertical footage of 11m each time, wherein the drilling direction of the drilling and blasting method is 45 degrees in a downward inclination angle, and the vertical row spacing is 1.5m;
(5) Excavating the bottom of an 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; applying steel lining concrete layer by layer along the bottom-up direction to the wall of the underground storage cavern 8, wherein the height of a single section is 20m;
(6) The conduit 9 is arranged on the wall surface of the piping shaft 3 between the ground and the top of the underground storage cavern 8, and the concrete operation is as follows: firstly, the construction platform 7 is lowered, a guide pipe is placed on the construction platform 7, then the construction platform 7 is connected with the lifting device 6, the construction platform 7 is lifted through the lifting device 6, the guide pipe 9 on the construction platform 7 is inserted into the pipeline well 3 and stretches out of the ground, the guide pipe 9 is fixed when steel lining concrete is applied to the top of the underground storage cavern 8, and finally the lifting device 6 and the construction platform 7 are removed, so that an oversized-section underground storage cavern 8 with the diameter of 35m is formed.
Example 2
The embodiment provides a method for performing reverse well expansion and excavation of an oversized-section underground reservoir cavity by adopting the device system, as shown in fig. 1 and 2, the method comprises the following steps:
(1) Adopting a reverse well drilling machine 1 to drill forward from the ground into an underground rock mass to form a phi 250mm pilot hole 2 communicated with an underground construction channel 5, enlarging and digging the underground construction channel 5 (width x height: 6.0m x 6.0 m) to the interface position of the pilot hole 2, erecting an intersection portal (not shown in the figure), and continuing to construct to the side wall according to the outline (width x height: 7.5m x 6.0 m) of the underground construction channel 5;
(2) The pilot hole 2 obtained in the step (1) is reversely dug to the ground along the direction from bottom to top by adopting a reverse well drilling machine 1 to form a phi 2000mm pipeline well 3 for the subsequent arrangement of a conduit 9 so as to communicate an underground reservoir cavity 8 with the ground;
(3) Performing reverse excavation on the pipeline well 3 obtained in the step (2) for 1 time by adopting a reverse well drilling machine 1 along the direction from bottom to top to form a phi 4400mm vertical shaft 4 corresponding to the height of an underground storage chamber 8, wherein the circumferential footage of the vertical shaft is as in section a in fig. 1;
(4) Withdrawing the back-well drilling machine 1, arranging a lifting device 6 on the installation position of the original back-well drilling 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 motion in the vertical shaft 4; adopting a lifting device 6 and a construction platform 7 and carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft 4 manually; the vertical shaft 4 is reversely excavated from bottom to top for 4 times from inside to outside by using a drilling and blasting method, so as to form a well wall corresponding to an underground reservoir cavity 8 with the diameter of 40m, and the circumferential footage of the well wall is as b, c, d, e in fig. 1; carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft 4 before each reverse expansion, designing the circumferential footage of 4.45m each time, carrying out charging blasting in a divided manner after finishing all blast hole construction vertically once, and carrying out vertical footage 11m each time, wherein the drilling direction of the drilling and blasting method is a downward inclination angle of 40 degrees, and the vertical row spacing is 2m;
(5) Excavating the bottom of an 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; applying steel lining concrete layer by layer along the bottom-up direction to the wall of the underground storage cavern 8, wherein the height of a single section is 18m;
(6) The conduit 9 is arranged on the wall surface of the piping shaft 3 between the ground and the top of the underground storage cavern 8, and the concrete operation is as follows: firstly, the construction platform 7 is lowered, a guide pipe is placed on the construction platform 7, then the construction platform 7 is connected with the lifting device 6, the construction platform 7 is lifted through the lifting device 6, the guide pipe 9 on the construction platform 7 is inserted into the pipeline well 3 and stretches out of the ground, the guide pipe 9 is fixed when steel lining concrete is applied to the top of the underground storage cavern 8, and finally the lifting device 6 and the construction platform 7 are removed, so that an oversized-section underground storage cavern 8 with the diameter of 40m is formed.
Example 3
The embodiment provides a method for performing reverse well expansion and excavation of an oversized-section underground reservoir cavity by adopting the device system, as shown in fig. 1 and 2, the method comprises the following steps:
(1) Adopting a reverse well drilling machine 1 to drill forward from the ground into an underground rock mass to form a phi 250mm pilot hole 2 communicated with an underground construction channel 5, enlarging and digging the underground construction channel 5 (width x height: 6.0m x 6.0 m) to the interface position of the pilot hole 2, erecting an intersection portal (not shown in the figure), and continuing to construct to the side wall according to the outline (width x height: 7.5m x 6.0 m) of the underground construction channel 5;
(2) The pilot hole 2 obtained in the step (1) is reversely dug to the ground along the direction from bottom to top by adopting a reverse well drilling machine 1 to form a 2500mm phi pipeline well 3 for the subsequent arrangement of a conduit 9 so as to communicate an underground reservoir cavity 8 with the ground;
(3) 2 times of reverse expansion digging is carried out on the pipeline well 3 obtained in the step (2) along the direction from bottom to top by adopting a reverse well drilling machine 1, so as to form a phi 5000mm vertical shaft 4 corresponding to the height of an underground storage chamber 8, and the circumferential footage of the vertical shaft is as in section a in fig. 1;
(4) Withdrawing the back-well drilling machine 1, arranging a lifting device 6 on the installation position of the original back-well drilling 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 motion in the vertical shaft 4; adopting a lifting device 6 and a construction platform 7 and carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft 4 manually; the vertical shaft 4 is reversely excavated from bottom to top and from inside to outside by using a drilling and blasting method to form a well wall corresponding to an underground reservoir cavity 8 with the diameter of 45m, and the circumferential footage of the well wall is as b, c, d, e in the section in figure 1; carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft 4 before each reverse expansion, designing the circumferential footage of 5m each time, carrying out explosive loading blasting in a divided manner after finishing all blast hole construction vertically once, and carrying out vertical footage of 17.5m each time, wherein the drilling direction of the drilling and blasting method is a downward inclination angle of 50 degrees, and the vertical row spacing is 1m;
(5) Excavating the bottom of an 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; applying steel lining concrete layer by layer along the bottom-up direction to the wall of the underground storage cavern 8, wherein the height of a single section is 22m;
(6) The conduit 9 is arranged on the wall surface of the piping shaft 3 between the ground and the top of the underground storage cavern 8, and the concrete operation is as follows: firstly, the construction platform 7 is lowered, a guide pipe is placed on the construction platform 7, then the construction platform 7 is connected with the lifting device 6, the construction platform 7 is lifted through the lifting device 6, the guide pipe 9 on the construction platform 7 is inserted into the pipeline well 3 and stretches out of the ground, the guide pipe 9 is fixed when steel lining concrete is applied to the top of the underground storage cavern 8, and finally the lifting device 6 and the construction platform 7 are removed, so that an oversized-section underground storage cavern 8 with the diameter of 45m is formed.
In the embodiments 1-3, the ultra-large section underground storage caverns with the diameters of 35-45m are excavated by a reverse well expansion excavation mode, so that the expected targets are completed.
Therefore, the method provided by the invention only needs one construction shaft and one underground construction channel for deslagging in the excavation process of the whole underground storage cavern, the whole excavation engineering amount is small, the problem of blockage of a pipeline well is avoided, the deslagging amount is small, the potential safety hazard is low, and the construction speed is high; in addition, the method provided by the invention avoids forming an excavation working surface between the ground and the top of the underground reservoir cavity by combining the reverse well excavation and the drilling, blasting and expanding excavation, and improves the stability of the reservoir structure in the later use process; the method is particularly suitable for excavating the underground storage cavern with the ultra-large section, is safe and efficient, and has little damage to the structural stability of the cavern.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (13)
1. A method for reverse well expansion and excavation of an oversized-section underground storage cavern, the method comprising the steps of:
(1) Forward drilling from the ground into the underground rock mass to form a pilot hole communicated with an underground construction channel;
(2) Reversely enlarging and excavating the pilot hole obtained in the step (1) to the ground to form a pipeline well;
(3) Performing reverse excavation on the pipeline well obtained in the step (2) for at least 1 time to form a vertical shaft corresponding to the height of the underground reservoir cavity;
(4) Performing reverse 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 reservoir cavity;
(5) Excavating the bottom of an underground storage cavern, and reinforcing the bottom, the top and the well wall of the underground storage cavern;
(6) And reinforcing the pipeline well between the ground and the top of the underground storage cavern.
2. The method of claim 1, wherein steps (1) - (3) are performed using a backdrilling machine.
3. The method of claim 1, wherein steps (4) - (6) are performed using a lifting device and a construction platform.
4. The method of claim 1, wherein step (4) is performed using a drill-burst method.
5. The method of claim 4, wherein the direction of drilling by the detonation method is at a downward inclination of 40 ° -50 °.
6. The method of claim 4, wherein the vertical gauge of the drill-burst method is 1-2m.
7. The method of claim 1, wherein the inner wall of the shaft is subjected to a temporary spray-mixing treatment before each reverse reaming in step (4).
8. The method of claim 1, wherein the ratio of the circumferential footage to the vertical footage of each reverse reaming of step (4) ranges from 1 (2.5-3.5).
9. The method according to claim 1, wherein the reinforcement treatment of step (5) is in particular the application of steel lined concrete.
10. The method of claim 9, wherein the steel lined concrete is used in a section-by-section manner when reinforcing the borehole wall.
11. The method of claim 10, wherein the individual section height of the sections layer by layer is 18-22m.
12. The method according to claim 1, wherein the strengthening treatment of step (6) is in particular the placement of a conduit on the wall of the piping well.
13. The method according to any one of claims 1-12, characterized in that the method comprises the steps of:
(1) Adopting a reverse well drilling machine to drill forward from the ground into the underground rock mass to form a pilot hole communicated with an underground construction channel;
(2) Performing reverse expansion digging on the pilot hole obtained in the step (1) to the ground by adopting a reverse well drilling machine to form a pipeline well;
(3) Performing reverse expansion digging on the pipeline well obtained in the step (2) for at least 1 time by adopting a reverse well drilling machine to form a vertical shaft corresponding to the height of the underground reservoir cavity;
(4) Adopting a lifting device and a construction platform, and performing reverse 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 a cavity of an underground reservoir; the drilling direction of the drilling and blasting method is a downward inclination angle of 40-50 degrees, and the vertical row spacing is 1-2m; carrying out temporary spraying and mixing treatment on the inner wall of the vertical shaft before each reverse expansion, wherein the ratio of the circumferential footage to the vertical footage of each reverse expansion 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 mode of sections and layers when reinforcing the well wall, and the height of a single section is 18-22m;
(6) And a conduit is arranged on the wall surface of the pipeline between the ground and the top of the underground storage chamber.
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