CN113236309A - Shallow tunnel arch-up open-construction arch-down underground excavation construction method - Google Patents
Shallow tunnel arch-up open-construction arch-down underground excavation construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 88
- 238000009412 basement excavation Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 44
- 239000010959 steel Substances 0.000 claims description 44
- 239000004567 concrete Substances 0.000 claims description 41
- 239000004570 mortar (masonry) Substances 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 11
- 239000004927 clay Substances 0.000 claims description 7
- 244000025254 Cannabis sativa Species 0.000 claims description 5
- 238000010899 nucleation Methods 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000001012 protector Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Paleontology (AREA)
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- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a shallow tunnel arch up-arch open-arch and down-arch underground excavation construction method, and relates to the technical field of tunnel construction. The method comprises the following steps: s1, leveling a gutter and excavating a side slope; s2, excavating an arch part by an open cut method; s3, arch support is performed; s4, backfilling the surface on the arch; s5, excavating the three steps and the temporary inverted arch; s6, secondary lining; and S7, paving a waterproof layer. The construction method for the shallow tunnel under-arch underground excavation with the top-exposed arch structure effectively controls the surface subsidence, protects the ground buildings, prevents the ground buildings from being influenced by the tunnel construction, avoids the result of dismantling the ground buildings, greatly saves the construction time, thereby saving the cost, has reasonable design of the tunnel secondary lining structure, simple construction method and easy control of the construction quality, thereby greatly reducing the construction cost, saving the construction period, ensuring the construction safety and having good social benefit.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method for underground excavation of a shallow tunnel with an upper open arch and a lower open arch.
Background
In recent years, with the rapid development of tunnel construction technology, tunnel sections are increasingly large, and geological conditions are increasingly poor, especially in ultra-shallow buried sections, large-section tunnel construction is difficult, slow in progress and high in danger, and large excavation construction is not allowed by adopting an open cut method for the ultra-shallow buried sections of tunnels, which are often penetrated by buildings (structures) on the ground surface or have poor geological conditions.
The tunnel section is large in the construction process, the vertical height of open cut to be excavated is large in the shallow tunnel construction process, further excavation slope enlargement is large, disturbance and damage are inevitably generated to surrounding soil bodies in the excavation process, open cut tunnel concrete construction is difficult, backfill amount is large and other problems exist, and meanwhile, the shallow tunnel is easy to collapse due to the safety risk when improper support is generated, and further the surrounding environments such as the earth surface are affected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a shallow tunnel arch top open arch bottom underground excavation construction method, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a shallow tunnel top open arch and bottom underground excavation construction method comprises the following steps:
s1, leveling the gutter and digging a side slope: after the gutter is smoothly applied, permanent side slopes on two sides of the line begin to be excavated, and spray-seeding grass planting protection is applied;
s2, arch part excavation by an open cut method: excavating an arch part by adopting an open cut method, constructing a temporary slope support, carrying out anchor net guniting operation on the temporary slope support, and arranging a mortar anchor rod;
s3, arch support: constructing arch support, erecting steel frames, arranging 2 42 locking anchor pipes on the left arch foot and the right arch foot respectively, and pouring a molded concrete arch protection;
s4, arch backfilling: after the arch protection strength in the step S3 reaches the design, tamping and filling soil and stones to the temporary backfill surface;
s5, excavating three steps and a temporary inverted arch: when the backfill soil in the step S4 recovers the surface building (structure), the construction is changed from arch top open construction to arch bottom underground excavation construction, and the normal excavation of the hole body is carried out under the arch by adopting a three-step and temporary inverted arch method;
s6, secondary lining: when the excavation under the arch in the step S5 is finished by adopting the three steps and the temporary inverted arch, constructing a side wall and a temporary support, and constructing second lining concrete;
s7, paving a waterproof layer: and (5) after the second-lining concrete in the step S6 reaches the design strength, timely backfilling the earth stones to the design elevation, and paving a clay waterproof layer to finish the construction.
Further optimizing the technical scheme, in the step S2, the thickness of the sprayed concrete after the anchor nets are sprayed with the slurry is 12-18cm, 8 steel bar nets are adopted, and the space between the grids is 20cm x 20 cm.
Further optimizing the technical scheme, in the step S2, the diameter of the mortar anchor rod is 20-22cm, the length of the anchor rod is 3.5-4.0m, and the distance between two adjacent anchor rods of the pre-embedded anchor rod is 1.0 x 1.0 m.
Further optimizing the technical scheme, the steel frames in the step S3 are I20b type steel frames, the spacing between erected steel frames is 0.6 m/truss, the length of the 42-pin anchor pipe in the step S3 is 6.0m, and the longitudinal spacing is 0.6 m.
Further optimizing the technical scheme, the concrete poured in the step S3 is C25 concrete, and the thickness of the concrete is 100-110 cm.
Further optimizing the technical scheme, in the step S3, when the steel frame is erected, a protective arch I20b steel frame joint is reserved so as to be connected with an arch wall steel frame during underground excavation under the arch.
Further optimizing the technical scheme, the height of the arch top in the step S4 is 3-4m, and the thickness of the clay waterproof layer in the step S7 is 40-60 cm.
Further optimizing the technical scheme, in the step S2, the anchor rods are arranged in the poured concrete, then the reinforcing mesh is laid along the excavated slope, and then the concrete is sprayed along the surface of the reinforcing mesh.
Compared with the prior art, the invention provides a shallow tunnel arch top open arch bottom underground excavation construction method, which has the following beneficial effects:
1. the invention relates to a method for constructing a shallow tunnel by adopting an arch top open construction and an arch bottom underground excavation construction, which is characterized in that the arch top open construction is converted into the arch bottom underground excavation construction, the arch bottom is normally excavated by adopting a three-step and temporary inverted arch method, so that the construction safety is ensured, and the influence on the surrounding environment is reduced.
2. The construction method for the shallow tunnel under-arch underground excavation with the top-exposed arch structure effectively controls the surface subsidence, protects the ground buildings, prevents the ground buildings from being influenced by the tunnel construction, avoids the result of dismantling the ground buildings, greatly saves the construction time, thereby saving the cost, has reasonable design of the tunnel secondary lining structure, simple construction method and easy control of the construction quality, thereby greatly reducing the construction cost, saving the construction period, ensuring the construction safety and having good social benefit.
Drawings
FIG. 1 is a schematic flow chart of a shallow tunnel arch top open arch bottom underground excavation construction method provided by the invention;
FIG. 2 is a schematic structural diagram of a flat gutter and an excavated slope of the shallow tunnel under-arch underground excavation construction method with an arch-up and an arch-down structure;
FIG. 3 is a schematic view of an arch portion excavated by an open cut method of the shallow tunnel arch-up open arch-down underground excavation construction method provided by the invention;
FIG. 4 is a schematic diagram of a construction arch support structure of the construction method of the shallow tunnel arch with an upper open arch and a lower underground excavation;
FIG. 5 is a schematic structural view of an arch backfill surface of the shallow tunnel arch top open arch bottom underground excavation construction method provided by the invention;
fig. 6 is a schematic diagram of a three-step + temporary inverted arch excavation structure of the shallow tunnel arch top-open arch bottom-arch underground excavation construction method provided by the invention;
fig. 7 is a schematic structural diagram of a secondary lining and a waterproof layer laying structure of the shallow tunnel arch top open arch bottom underground excavation construction method provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: referring to fig. 1 to 7, the present invention discloses a shallow tunnel arch top-open arch bottom-underground excavation construction method, which includes the following steps:
s1, leveling the gutter and digging a side slope: after the gutter is smoothly applied, permanent side slopes on two sides of the line begin to be excavated, and spray-seeding grass planting protection is applied;
s2, arch part excavation by an open cut method: excavating an arch part by adopting an open cut method, constructing a temporary slope support, wherein the temporary slope support is operated by adopting anchor net guniting, and is provided with a mortar anchor rod, the thickness of concrete sprayed after the anchor net guniting is 12cm, 8 steel bar nets are adopted, the space between grids is 20 cm-20 cm, the diameter of the mortar anchor rod is 20cm, the length of the anchor rod is 3.5m, the space between two adjacent anchor rods of the anchor rod is 1.0-1.0 m, the anchor rod is arranged on an excavation slope, then the steel bar net is laid on the surface of the excavated slope, and then the concrete is sprayed along the surface of the steel bar net;
s3, arch support: constructing arch support, erecting steel frames, arranging 2 42 locking anchor pipes on left and right arch legs respectively, pouring a molded concrete arch protector, wherein the steel frames are I20b steel frame, the distance between erected steel frames is 0.6 m/pin, the length of the 42 locking anchor pipe is 6.0m, the longitudinal distance is 0.6, the poured concrete is C25 concrete, the thickness of the concrete is 100cm, and an arch protector I20b steel frame joint is reserved when erecting the steel frames so as to be connected with an arch wall during underground excavation under the arch;
s4, arch backfill surface: after the arch protection strength in the step S3 reaches the design, tamping and filling soil and stones to the temporary backfill surface;
s5, excavating three steps and a temporary inverted arch: when the surface construction (structure) of the backfill soil in the step S4 is recovered, the arch top open construction is changed into the arch bottom underground excavation construction, and the normal excavation of the hole body is carried out under the arch by adopting a three-step and temporary inverted arch method;
s6, secondary lining: when the excavation under the arch in the step S5 is finished by adopting the three steps and the temporary inverted arch, constructing a side wall and a temporary support, and constructing second lining concrete;
s7, paving a waterproof layer: and (5) after the second-lining concrete in the step S6 reaches the design strength, timely backfilling the earth stones to the design elevation, and paving a clay waterproof layer with the thickness of 40cm to finish the construction.
Example two: referring to fig. 1 to 7, the present invention discloses a shallow tunnel arch top-open arch bottom-underground excavation construction method, which includes the following steps:
s1, leveling the gutter and digging a side slope: after the gutter is smoothly applied, permanent side slopes on two sides of the line begin to be excavated, and spray-seeding grass planting protection is applied;
s2, arch part excavation by an open cut method: excavating an arch part by adopting an open cut method, constructing a temporary slope support, wherein the temporary slope support is operated by adopting anchor mesh guniting, and is provided with a mortar anchor rod, the thickness of concrete sprayed after the anchor mesh guniting is 15cm, 8 steel bar meshes are adopted, the space between grids is 20cm to 20cm, the diameter of the mortar anchor rod is 22cm, the length of the anchor rod is 4.0m, the space between two adjacent anchor rods with the embedded anchor rods is 1.0 to 1.0m, the anchor rod is arranged on the surface of the excavated slope, then the steel bar meshes are laid on the surface of the excavated slope, and then the concrete is sprayed along the surface of the steel bar meshes;
s3, arch support: constructing arch support, erecting steel frames, arranging 2 42 locking anchor pipes on left and right arch legs respectively, pouring a molded concrete arch protector, wherein the steel frames are I20b steel frame, the distance between erected steel frames is 0.6 m/pin, the length of the 42 locking anchor pipe is 6.0m, the longitudinal distance is 0.6, the poured concrete is C25 concrete, the thickness of the concrete is 100cm, and an arch protector I20b steel frame joint is reserved when erecting the steel frames so as to be connected with an arch wall during underground excavation under the arch;
s4, arch backfill surface: after the arch protection strength in the step S3 reaches the design, tamping and filling soil and stones to the temporary backfill surface;
s5, excavating three steps and a temporary inverted arch: when the backfill soil in the step S4 recovers the surface building (structure), the construction is changed from arch top open construction to arch bottom underground excavation construction, and the normal excavation of the hole body is carried out under the arch by adopting a three-step and temporary inverted arch method;
s6, secondary lining: when the excavation under the arch in the step S5 is finished by adopting the three steps and the temporary inverted arch, constructing a side wall and a temporary support, and constructing second lining concrete;
s7, paving a waterproof layer: and (5) after the second-lining concrete in the step S6 reaches the design strength, timely backfilling the earth stones to the design elevation, and paving a clay waterproof layer with the thickness of 50cm, thereby completing construction.
Example three: referring to fig. 1 to 7, the present invention discloses a shallow tunnel arch top-open arch bottom-underground excavation construction method, which includes the following steps:
s1, leveling the gutter and digging a side slope: after the gutter is smoothly applied, permanent side slopes on two sides of the line begin to be excavated, and spray-seeding grass planting protection is applied;
s2, arch part excavation by an open cut method: excavating an arch part by adopting an open cut method, constructing a temporary slope support, wherein the temporary slope support is operated by adopting anchor net guniting, and is provided with a mortar anchor rod, the thickness of concrete sprayed after the anchor net guniting is 16cm, 8 steel bar nets are adopted, the space between grids is 20cm to 20cm, the diameter of the mortar anchor rod is 22cm, the length of the anchor rod is 3.8m, the space between two adjacent anchor rods with pre-embedded anchor rods is 1.0 to 1.0m, the mortar anchor rod is arranged on the excavated slope, then the steel bar nets are laid on the surface of the excavated slope, and then the concrete is sprayed along the surface of the steel bar nets;
s3, arch support: constructing arch support, erecting steel frames, arranging 2 42 locking anchor pipes on left and right arch legs respectively, pouring a molded concrete arch protector, wherein the steel frames are I20b steel frame, the distance between erected steel frames is 0.6 m/pin, the length of the 42 locking anchor pipe is 6.0m, the longitudinal distance is 0.6, the poured concrete is C25 concrete, the thickness of the concrete is 100cm, and an arch protector I20b steel frame joint is reserved when erecting the steel frames so as to be connected with an arch wall during underground excavation under the arch;
s4, arch backfill surface: after the arch protection strength in the step S3 reaches the design, tamping and filling soil and stones to the temporary backfill surface;
s5, excavating three steps and a temporary inverted arch: when the backfill soil in the step S4 recovers the surface building (structure), the construction is changed from arch top open construction to arch bottom underground excavation construction, and the normal excavation of the hole body is carried out under the arch by adopting a three-step and temporary inverted arch method;
s6, secondary lining: when the excavation under the arch in the step S5 is finished by adopting the three steps and the temporary inverted arch, constructing a side wall and a temporary support, and constructing second lining concrete;
s7, paving a waterproof layer: and (5) after the second-lining concrete in the step S6 reaches the design strength, timely backfilling the earth stones to the design elevation, and paving a clay waterproof layer with the thickness of 60cm to finish the construction.
And (4) judging the standard: through comparison of the three embodiments, the best effect is the second embodiment, so that the second embodiment is selected as the best embodiment, and the specific change of the amount also belongs to the protection scope of the technical scheme.
The invention has the beneficial effects that: the invention relates to a method for constructing a shallow tunnel under an arch with an open top and an open bottom, which is characterized in that the construction is converted from the construction of the open top to the construction of the underground bottom, the normal excavation of a tunnel body is carried out under the arch by adopting a three-step and temporary inverted arch method, the construction safety is ensured, and the influence on the surrounding environment is reduced; in the construction of the shallow-buried underpass tunnel, the invention effectively controls the ground surface settlement, protects the ground buildings, prevents the ground buildings from being influenced by the tunnel construction, avoids the result of dismantling the ground buildings, greatly saves the construction time, thereby saving the cost, has reasonable design of the tunnel secondary lining structure, simple construction method and easy control of the construction quality, thereby greatly reducing the construction cost, saving the construction period, ensuring the construction safety and having good social benefit.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A shallow tunnel arch top open arch bottom underground excavation construction method is characterized by comprising the following steps:
s1, leveling the gutter and digging a side slope: after the gutter is smoothly applied, permanent side slopes on two sides of the line begin to be excavated, and spray-seeding grass planting protection is applied;
s2, arch part excavation by an open cut method: excavating an arch part by adopting an open cut method, constructing a temporary slope support, carrying out anchor net guniting operation on the temporary slope support, and arranging a mortar anchor rod;
s3, arch support: constructing arch support, erecting steel frames, arranging 2 42 locking anchor pipes on the left arch foot and the right arch foot respectively, and pouring a molded concrete arch protection;
s4, arch backfill surface: after the arch protection strength in the step S3 reaches the design, tamping and filling soil and stones to the temporary backfill surface;
s5, excavating three steps and a temporary inverted arch: when the backfill soil in the step S4 recovers the surface building (structure), the construction is changed from arch top open construction to arch bottom underground excavation construction, and the normal excavation of the hole body is carried out under the arch by adopting a three-step and temporary inverted arch method;
s6, secondary lining: when the excavation under the arch in the step S5 is finished by adopting the three steps and the temporary inverted arch, constructing a side wall and a temporary support, and constructing second lining concrete;
s7, paving a waterproof layer: and (5) after the second-lining concrete in the step S6 reaches the design strength, timely backfilling the earth stones to the design elevation, and paving a clay waterproof layer to finish the construction.
2. The underground excavation construction method for the upper open arch and the lower arch of the shallow tunnel according to claim 1, wherein the thickness of the concrete sprayed after the anchor nets are sprayed with the slurry in the step S2 is 12-18cm, 8 steel bar nets are adopted, and the space between the grids is 20cm by 20 cm.
3. The underground excavation construction method for the upper open arch and the lower arch of the shallow tunnel according to claim 1, wherein the diameter of the mortar anchor rod in the step S2 is 20-22cm, the length of the anchor rod is 3.5-4.0m, and the distance between two adjacent anchor rods of the embedded anchor rod is 1.0 x 1.0 m.
4. The underground excavation construction method for the upper arch and the lower arch of the shallow tunnel arch according to claim 1, wherein the steel frames in the step S3 are I20b type steel frames, the spacing between the erected steel frames is 0.6 m/truss, the length of the 42-pin anchor pipe in the step S3 is 6.0m, and the longitudinal spacing is 0.6 m.
5. The underground excavation construction method for the upper arch and the lower arch of the shallow tunnel according to claim 1, wherein the concrete poured in the step S3 is C25 concrete, and the thickness of the concrete is 100-110 cm.
6. The underground excavation construction method for the upper open arch and the lower arch of the shallow tunnel according to claim 1, wherein in the step S3, a steel frame joint of a protective arch I20b steel frame is reserved during steel frame erection operation, so as to be connected with an arch wall steel frame during underground excavation.
7. The underground excavation construction method for the shallow tunnel arch with the open arch and the closed arch according to claim 1, wherein the height of the arch top in the step S4 is in the range of 3-4m, and the thickness of the clay waterproof layer in the step S7 is in the range of 40-60 cm.
8. The underground excavation method for the shallow tunnel according to claim 1, wherein the anchor rods are installed in the excavated slopes, the reinforcing mesh is laid on the surfaces of the excavated slopes, and the concrete is sprayed along the surfaces of the reinforcing mesh in step S2.
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| CN202110466910.9A CN113236309A (en) | 2021-04-28 | 2021-04-28 | Shallow tunnel arch-up open-construction arch-down underground excavation construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233297A (en) * | 2021-12-09 | 2022-03-25 | 中建八局南方建设有限公司 | Excavation construction method for large-span small-clear-distance shallow-buried tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233297A (en) * | 2021-12-09 | 2022-03-25 | 中建八局南方建设有限公司 | Excavation construction method for large-span small-clear-distance shallow-buried tunnel |
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