CN112065467A - Underground engineering supporting structure and construction method thereof - Google Patents
Underground engineering supporting structure and construction method thereof Download PDFInfo
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- CN112065467A CN112065467A CN202011006813.3A CN202011006813A CN112065467A CN 112065467 A CN112065467 A CN 112065467A CN 202011006813 A CN202011006813 A CN 202011006813A CN 112065467 A CN112065467 A CN 112065467A
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- 238000010276 construction Methods 0.000 title claims abstract description 71
- 238000009412 basement excavation Methods 0.000 claims abstract description 29
- 239000002689 soil Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 12
- 230000002452 interceptive effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 15
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000011150 reinforced concrete Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses an underground engineering supporting structure and a construction method thereof, which solve the problem of high construction risk of the traditional excavation method of underground engineering. The underground excavation construction method comprises two advanced pilot tunnels obtained through underground excavation construction, wherein an arch structure and a bottom plate structure are obtained through construction between the two advanced pilot tunnels, and the bottom plate structure is arranged below the arch structure; and a combined lining is arranged in the advanced pilot tunnel, and the arch structure and the bottom plate structure are connected with the combined lining. The arch structure can be arranged to support the top of the excavated soil body, and the combined lining synchronously supports the two ends of the arch structure, so that the whole excavated structure is reinforced, the load borne by the arch structure is shared, the structural design of the tunnel is reinforced, and the service life of the tunnel is prolonged.
Description
Technical Field
The invention belongs to the technical field of underground engineering, and particularly relates to an underground engineering supporting structure and a construction method thereof.
Background
The twenty-first century is a century for developing and utilizing underground space, and particularly with the rapid development of cities, the transitional development of resources inevitably brings a series of serious problems of environmental pollution, energy shortage, traffic congestion, water resource shortage and the like, so people have to develop underground engineering to relieve the pressure caused by land resource shortage.
The current common construction methods for urban underground engineering construction mainly comprise open excavation, underground excavation, pipe jacking and the like. Although the open cut method has the advantages of simple construction process, mature technology and the like, the construction of the open cut method needs to carry out integral excavation, multiple times of traffic dismissal and large amount of pipeline relocation on the ground, and has great influence on social public traffic and environment; the underground excavation method is flexible and changeable in structural form, but is low in construction speed, low in mechanization degree and high in safety risk; the shield and pipe jacking technology has high mechanization and automation degree, is generally applied to linear space structures, but has higher construction cost.
A prefabricated concrete hyperbolic thin shell arch assembly type underground engineering structure is disclosed in Chinese patent (application number: CN 200510031476.2), the prefabricated concrete is adopted in the patent, and a concrete prefabricated part which is consistent with underground engineering is produced according to the scale of the engineering before the engineering movable soil is excavated to ensure the engineering construction; the supporting construction of this patent need be constructed according to concrete engineering production corresponding prefabricated component again, and the engineering matching degree is low does not have unity work progress complicacy, and can't be adapted to the horizontal large-span space that is greater than 15 m.
Disclosure of Invention
The invention provides an underground engineering supporting structure and an underground engineering construction method, aiming at the problems of complex construction, low speed and high risk or construction cost of the existing construction method, and solving the problem of high construction risk of the traditional underground engineering excavation method.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an underground engineering supporting structure and a construction method thereof comprise two advanced pilot tunnels obtained by underground excavation construction, wherein an arch structure and a bottom plate structure are obtained by construction between the two advanced pilot tunnels, and the bottom plate structure is arranged below the arch structure; and a combined lining is arranged in the advanced pilot tunnel, and the arch structure and the bottom plate structure are connected with the combined lining. The arch structure protects the soil body to be excavated, and facilitates excavation of the soil body.
The arch structure comprises an arch shell primary support structure, supports are arranged in the two combined lining, and the end parts of the arch shell primary support structure are correspondingly connected with the two supports; the lower part of the arch shell primary support structure is provided with a secondary lining structure, and two ends of the secondary lining structure are respectively and correspondingly connected with the two combined linings. The bearing capacity of the underground engineering supporting structure is enhanced by the arrangement of the arch shell primary supporting structure and the secondary lining structure.
A hinged support is arranged between the arch shell primary support structure and the support, the hinged support is only stressed by axial force, bending moment is avoided, and meanwhile, the shearing force is almost zero, so that arch crown load of the arch shell primary support structure is conveniently transferred through the hinged support, and the stress of the support is more definite.
The bottom plate structure comprises a bottom plate, longitudinal beams are arranged at the bottoms of the two combined type linings, and a bottom plate is arranged between the two longitudinal beams.
In order to facilitate the construction of the auxiliary structure in the later period, backfill materials are arranged in the lower part of the combined lining.
A construction method of an underground engineering structure comprises the following steps:
s1, respectively excavating an originating well and a receiving well;
s2, respectively excavating a pilot tunnel between the starting well and the receiving well, and paving a combined lining in the pilot tunnel;
s3, constructing an arch structure to form an advance pre-support;
s4, excavating the soil body of the enclosed area at the lower part of the arch structure to form a central excavation area;
s5, repeatedly executing the step S3 and the step S4 until the excavation of the underground space corresponding to the whole underground engineering structure is completed;
s6, removing the combined lining below the arch structure, and communicating the pilot tunnel with the central excavation area;
s7, constructing a bottom plate structure between the combined linings of the two leading holes;
and S8, constructing the auxiliary structure in the underground space with the finished bottom plate structure.
In step S3, the arch structure includes an arch shell primary support structure and a secondary lining structure, and the arch structure is constructed by the following steps:
s3.1, disassembling a combined lining interfering with the arch shell primary support structure;
s3.2, constructing an arch shell primary support structure, and manufacturing a support between the arch shell primary support structure and the combined lining to form a primary support structure of a transverse span space;
s3.3, excavating a top construction space under the protection of the arch shell primary support structure;
and S3.4, disassembling the combined lining interfering with the secondary lining structure, constructing the secondary lining structure in the top construction space, and connecting the secondary lining structure with the inner side wall of the combined lining.
In step S3.2, when the support is manufactured, a hinged support is embedded in the support, and the hinged support and the arch shell primary support structure are connected.
In step S7, the implementation of the backplane structure includes the following steps:
s7.1, leveling a field between the two combined linings;
s7.2, constructing a bottom plate in the finished site, and respectively constructing longitudinal beams between the end part of the bottom plate and the combined lining;
s7.3, filling backfill materials into the lower part of the combined lining.
The invention has the beneficial effects that:
the arch structure can support the top of the excavated soil body, the combined lining synchronously supports and reinforces the end part of the arch structure, the bottom plate structure is correspondingly connected with the combined lining, the excavated bottom soil body is protected, the integral excavated structure is further reinforced, and simultaneously the arch top load of the arch structure is shared, so that the structural design of the tunnel is reinforced, the safety of the construction process is ensured, and the service life of the tunnel is synchronously prolonged; the construction method is simple and rapid, construction is convenient, the primary support structure system of the transverse span space provides guarantee for later-stage engineering construction, the risk of engineering construction is reduced, the logical property of the construction process is strong, the constructors can realize rapid and efficient construction of underground engineering construction under the complex urban construction condition according to the step-by-step construction of the method, and simultaneously, the high-standard construction requirement, the safe and efficient production requirement and the environment requirement of environmental protection required by the engineering construction are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the location of an originating well, a receiving well, and a leading pilot hole.
Fig. 3 is a schematic layout view of the pilot tunnel and the combined lining.
Fig. 4 is a schematic diagram of the completion of step S3.2 of example 2.
Fig. 5 is a schematic diagram of the completion of step S3.5 of example 2.
Fig. 6 is a schematic view of completion of step S4 of embodiment 2.
Fig. 7 is a schematic view of completion of step S7 of embodiment 2.
Fig. 8 is a schematic view of completion of step S8 of embodiment 2.
In the figure, 1 is an initial well, 2 is a receiving well, 3 is a leading pilot tunnel, 4 is an arch structure, 5 is a combined lining, 6 is an arch shell primary support structure, 7 is a support, 8 is a secondary lining structure, 9 is a soil body of a surrounding area, 10 is a bottom plate, 11 is a longitudinal beam, 12 is a backfill material, and 13 is a hinged support.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1: a supporting structure of underground engineering is disclosed, as shown in figure 1, comprising two leading holes 3 obtained by underground excavation construction, an arch structure 4 and a bottom plate structure are obtained by constructing between the two leading holes 3, and the bottom plate structure is arranged below the arch structure 4; the inside of the advanced pilot tunnel 3 is provided with a combined lining 5, and the arch structure 4 and the bottom plate structure are both connected with the combined lining 5. The arch structure can be treated the excavation soil body and support, excavate the soil body under arch structure's protection during convenient construction, avoids excavation in-process soil body to collapse, and two modular lining cutting correspond with two tip of arch structure and are connected, consolidate the support to arch structure's tip to share load for arch structure transmission.
The arch structure 4 comprises an arch shell primary support structure 6 and a secondary lining structure 8, the secondary lining structure 8 is fixedly arranged at the lower part of the arch shell primary support structure 6, and two ends of the arch shell primary support structure 6 and two ends of the secondary lining structure 8 are respectively arranged in the two combined linings 5 in a penetrating manner; supports 7 are arranged in the two combined type linings 5, two ends of the arch shell primary support structure 6 are correspondingly connected with the two supports 7, arch top load is transmitted to the supports 7 through the arch shell primary support structure 6, and the supports 7 are fixedly arranged on the inner side walls of the combined type linings, so that the bearing capacity of the whole structure is further enhanced; the end of the secondary lining structure 8 is correspondingly connected with the bottoms of the two combined linings. In the embodiment, the arch shell primary support structure 6 is in an arch shape, the secondary lining structure 8 comprises an arch part 8-1 and a vertical part 8-2, the arch part 8-1 is fixedly arranged right below the arch shell primary support structure, and the arch part 8-1 is connected with the arch shell primary support structure in a matching way; the vertical parts 8-2 are symmetrically arranged on two sides of the arch part 8-1, the vertical parts 8-2 are positioned in the combined lining, one end of the vertical part 8-2 is fixedly connected with the end part of the arch part 8-1, and the other end of the vertical part 8-2 is fixedly connected with the bottom of the combined lining. The arch shell primary support structure 6 and the secondary lining structure 8 are matched to form a combined type design of an underground engineering structure, and the bearing capacity of the top structure is enhanced.
A hinged support 13 is further arranged between the support 7 and the arch shell primary support structure 6, and the hinged support 13 is fixedly embedded in the support 7; the hinged support 13 only bears axial force, no bending moment exists, and meanwhile, the shearing force is almost zero, so that the vault load of the arch shell primary support structure 6 is conveniently transmitted through the hinged support 13, and the bearing 7 is more definitely stressed.
The combined lining 5 is formed by splicing a plurality of arc lining plates; one end of the combined lining is fixedly connected with the outer side wall of the arch shell primary support structure 6, and the other end of the combined lining is fixedly connected with the end part of the bottom plate structure; the combined lining 5 and the support 7 provide structural support for the arch shell primary support structure 6; two vertical parts 8-2 of the secondary lining structure 8 are respectively fixedly connected with the bottoms of the combined linings on two sides, and the combined lining 5 synchronously provides structural support for the secondary lining structure 8.
The bottom plate structure comprises a bottom plate 10, longitudinal beams 11 are arranged at the bottoms of the inner sides of the two combined type linings 5, the bottom plate 10 is laid between the two longitudinal beams 11, and the longitudinal beams 11 are fixedly connected with the bottom plate 10 and the combined type linings 5 respectively, so that the design strength of the bottom structure is enhanced.
The combined lining 5 is internally provided with backfill materials 12, and the backfill materials 12 are horizontally laid to facilitate the construction of subsequent underground auxiliary facilities.
In this embodiment, the arch shell primary support structure 6 is made of steel pipes, steel arch frames or sprayed concrete; the support 7 is made of cast-in-place concrete, reinforced concrete or steel structure and other materials; the secondary lining structure 8 is made of reinforced concrete or steel fiber concrete and other materials; the combined lining 5 can adopt a concrete lining, a reinforced concrete lining, a steel fiber concrete lining or a reinforced concrete-profile steel combined lining and the like.
Example 2: a construction method of an underground engineering supporting structure comprises the following steps:
s1, constructing an initial well 1 and a receiving well 2: as shown in fig. 2, an originating well 1 and a receiving well 2 are respectively excavated at appropriate positions selected at both ends of a construction site where an underground project is to be constructed;
the starting well 1 and the receiving well 2 are arranged, so that hoisting of excavation equipment, jacking construction of the equipment and feeding and discharging of materials can be facilitated, and the sizes of the starting well 1 and the receiving well 2 can be set according to the construction requirements of a heading machine during specific construction.
S2, constructing the pilot tunnel 3: as shown in fig. 3, a leading pilot tunnel 3 is dug between an originating well 1 and a receiving well 2, and a combined lining 5 is laid on the inner side wall of the leading pilot tunnel 3;
the leading pilot holes 3 are symmetrically arranged at two ends of the originating well 1 and the receiving well 2, and the shape of the leading pilot holes 3 can be round, rectangular or similar to rectangular. The excavation of the pilot tunnel 3 can adopt methods such as a shield machine, a pipe jacking machine or manual excavation, and the excavation diameter of the pilot tunnel 3 can be determined according to the excavation size of the section and the specific functional requirements of the engineering.
The combined lining 5 can be spliced piece by adopting a prefabricated lining or formed in one step by adopting a cast-in-place mode.
S3, performing an arch structure: the construction arch structure 4 forms an advanced pre-support to ensure the stability of the excavation working face;
the arch structure comprises an arch shell primary support structure 6 and a secondary lining structure 8, and as shown in fig. 4 and 5, the construction of the arch structure comprises the following steps:
s3.1, disassembling part of combined type lining: the combined lining which interferes with the arch shell primary support structure 6 is disassembled, and the arch shell primary support structure is convenient to construct in the later period.
S3.2, constructing an arch shell primary support structure 6: constructing an arch shell primary support structure 6, manufacturing a support 7 between the arch shell primary support structure 6 and the combined lining 5, burying a hinged support 13 in the support 7, and connecting the arch shell primary support structure 6 and the hinged support 13 to form a primary support structure with a transverse span space;
the support 7 is arranged in the advanced pilot tunnel 3 and is fixedly connected with the combined lining 5, the support 7 plays a role of supporting the arch shell primary support structure 6, and the arch shell primary support structure 6, the hinged support 13, the support 7 and the combined lining 5 form a primary support structure system of a transverse span space together, so that construction of later-stage engineering is guaranteed.
The arch shell primary support structure 6 can be constructed by a curved pipe curtain method, a directional drilling machine method or a pre-injection arch method and the like.
S3.3, excavating a construction space: under the protection of the arch shell primary support structure 6, excavating a top construction space matched with the secondary lining structure 8 at the lower part of the arch shell primary support structure 6;
the top construction space is excavated under the protection of the arch shell primary support structure, so that the stability of an excavation working surface during construction is ensured, and ground settlement is reduced.
S3.4, constructing a secondary lining structure 8: disassembling the combined lining 5 interfering with the secondary lining structure 8, constructing the secondary lining structure 8 in a top construction space in a form of formwork trolley or extruded concrete, and connecting the secondary lining structure 8 with the inner side wall of the combined lining 5 to further form a supporting structure system of a transverse span space;
two ends of the bottom of the secondary lining structure 8 are respectively and fixedly connected with the combined lining 5 at the bottom in the two advanced pilot holes 3 correspondingly, and the combined lining 5 plays a role in supporting the secondary lining structure 8.
S4, excavating soil 9 in the enclosed area: as shown in fig. 6, excavating the soil 9 in the enclosed area at the lower part of the secondary lining structure 8 by using an excavating machine to form a central excavated area;
the enclosed area soil body 9 is enclosed by two combined type linings 5 and a secondary lining structure 8.
And S5, repeatedly executing the step S3 and the step S4 until the excavation of the whole underground space corresponding to the construction site is completed.
S6, communicating the excavation areas: as shown in fig. 7, the built-up lining 5, which interferes with the arch structure 4, below the arch structure 4 is removed, and the pilot tunnel 3 and the central excavated area are communicated.
S7, constructing a bottom plate structure: a bottom plate structure is constructed between the combined type linings 5 of the two leading holes 3, and the method comprises the following steps:
s7.1, leveling a field between the two combined type linings 5;
s7.2, constructing a bottom plate 10 in the finished site, and constructing longitudinal beams 11 between the end part of the bottom plate 10 and the combined type linings 5 on the two sides respectively;
the floor 10 construction can be done by backfilling concrete or reinforced concrete.
And S7.3, filling a backfill material 12 into the lower part of the combined lining 5, and constructing the backfill material 12 according to the function requirements of the underground engineering so as to facilitate the subsequent laying of an auxiliary structure used by the tunnel.
S8, auxiliary structure construction: as shown in fig. 8, in the underground space where the floor structure is completed, engineering works of structures such as electromechanical devices, water supply and drainage, and lighting devices of the underground space building are performed.
The structure of this example is the same as example 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The underground engineering supporting structure is characterized by comprising two advanced pilot tunnels (3) obtained by underground excavation construction, wherein an arch structure (4) and a bottom plate structure are obtained by construction between the two advanced pilot tunnels (3); the advanced pilot tunnel (3) is internally provided with a combined lining (5), and the arch structure (4) and the bottom plate structure are connected with the combined lining (5).
2. An underground engineering supporting structure according to claim 1, wherein the arch structure (4) comprises an arch shell primary supporting structure (6), supports (7) are arranged in the two combined linings (5), and the end parts of the arch shell primary supporting structure (6) are correspondingly connected with the two supports (7); the lower part of the arch shell primary support structure (6) is provided with a secondary lining structure (8), and two ends of the secondary lining structure (8) are respectively and correspondingly connected with the two combined linings (5).
3. An underground works support structure according to claim 2, characterized in that a hinged support (13) is provided between the arch shell primary support structure (6) and the support (7).
4. An underground works supporting construction according to claim 1 or 2 or 3, characterised in that the floor construction comprises a floor (10), that the bottom of both modular linings (5) is provided with longitudinal beams (11), and that the floor (10) is provided between the two longitudinal beams (11).
5. An underground works support structure according to claim 4, in which a backfill material (12) is provided in the lower part of the modular lining (5).
6. A construction method of an underground engineering supporting structure is characterized by comprising the following steps:
s1, respectively excavating an originating well (1) and a receiving well (2);
s2, respectively excavating a pilot tunnel (3) between the starting well (1) and the receiving well (2), and paving a combined lining (5) in the pilot tunnel (3);
s3, constructing an arch structure (4) to form an advance pre-support;
s4, excavating the soil body (9) of the enclosed area at the lower part of the arch structure (4) to form a central excavation area;
s5, repeatedly executing the step S3 and the step S4 until the excavation of the underground space corresponding to the whole underground engineering structure is completed;
s6, removing the combined lining (5) below the arch structure (4), and communicating the pilot tunnel (3) with the central excavation area;
s7, constructing a bottom plate structure between the combined linings (5) of the two leading holes (3);
and S8, constructing the auxiliary structure in the underground space with the finished bottom plate structure.
7. A construction method of an underground works supporting structure according to claim 6, wherein in step S3, said arch structure (4) comprises an arch shell primary structure (6) and a secondary lining structure (8), the construction of the arch structure (4) comprises the steps of:
s3.1, removing the combined lining (5) interfering with the arch shell primary support structure (6);
s3.2, constructing an arch shell primary support structure (6), and manufacturing a support (7) between the arch shell primary support structure (6) and the combined lining (5) to form a primary support structure of a transverse span space;
s3.3, excavating a top construction space under the protection of the arch shell primary support structure (6);
and S3.4, disassembling the combined lining (5) interfering with the secondary lining structure (8), and constructing the secondary lining structure (8) in the top construction space.
8. A construction method of an underground supporting structure according to claim 7, wherein in step S3.2, when the support (7) is manufactured, the hinge support (13) is embedded in the support (7) and the hinge support (13) and the arch shell primary supporting structure (6) are connected.
9. A construction method of an underground works supporting structure according to claim 6 or 7 or 8, wherein the construction of the floor structure in step S7 comprises the steps of:
s7.1, leveling a field between the two combined linings (5);
s7.2, constructing a bottom plate (10) in the finished site, and respectively constructing longitudinal beams (11) between the end parts of the bottom plate (10) and the combined linings (5);
s7.3, filling backfill materials (12) into the lower part of the combined lining (5).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417649A (en) * | 2021-08-09 | 2021-09-21 | 中铁第六勘察设计院集团有限公司 | Underground tunnel small-section to large-section expanding excavation method |
| CN115341900A (en) * | 2022-06-30 | 2022-11-15 | 国家能源投资集团有限责任公司 | Overlying rock loss reduction and settlement method based on artificial arch shell |
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| CN115341900B (en) * | 2022-06-30 | 2023-03-10 | 国家能源投资集团有限责任公司 | Overlying rock loss reduction and settlement method based on artificial arch shell |
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