CN112983478A - Shallow-buried underground tunnel foundation pit construction method under protection of cover plate - Google Patents
Shallow-buried underground tunnel foundation pit construction method under protection of cover plate Download PDFInfo
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- CN112983478A CN112983478A CN202110169133.1A CN202110169133A CN112983478A CN 112983478 A CN112983478 A CN 112983478A CN 202110169133 A CN202110169133 A CN 202110169133A CN 112983478 A CN112983478 A CN 112983478A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
A shallow-buried underground excavation tunnel foundation pit construction method under protection of a cover plate belongs to the technical field of tunnel construction. It comprises the following steps: the method comprises the following steps: construction preparation; step two: moving the municipal pipeline back, and backfilling and covering soil; step three to step eleven: constructing a first soil body area to a ninth soil body area in sequence; step twelve: pouring a tunnel bottom plate; step thirteen: pouring tunnel side walls and middle walls; fourteen steps: pouring a tunnel top plate; step fifteen: and backfilling the space between the reinforced concrete cover plate and the tunnel top plate. The invention adopts the advanced protection of underground continuous walls, steel lattice columns, upright column piles and reinforced concrete cover plates, and then adopts construction modes of advanced grouting small conduits and the like from working wells at two ends, so that the tunnel construction can be carried out in the construction environment that the deep foundation pit engineering is close to surrounding building structures or foundation pits are arranged along the side, and the road traffic influence on the construction area is reduced.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a shallow-buried underground excavation tunnel foundation pit construction method under protection of a cover plate.
Background
With the continuous development and utilization of urban underground space, deep foundation pit projects such as underground traffic tunnels and underground commercial streets are increasing. Because many of the projects are positioned below the main traffic roads in cities, the influence on the surrounding environment and the road traffic becomes the key point of the consideration of the supporting scheme, and a new problem is brought to the design and the analysis of the foundation pit. Among a plurality of construction methods, the cover-excavation method has obvious superiority for the projects under the condition that the ground tunnel reduces the influence on road traffic, and a plurality of engineering examples adopting the cover-excavation sequential method for construction are provided at home and abroad.
The situation that land is tight is increasingly remarkable, the deep foundation pit engineering relates to the situation that the building is close to the surrounding building and is more and more common, even sometimes, foundation pits need to be arranged along the edges, and the middle of the covering and digging foundation pit is not provided with a space of a soil outlet and a feed opening at all, so that the covering and digging construction efficiency is low.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a shallow-buried underground excavation tunnel foundation pit construction method under the protection of a cover plate, which reduces the influence of tunnel construction on road traffic and can adapt to the construction environment that a deep foundation pit engineering is close to a surrounding building or a foundation pit is arranged along the border.
The invention provides the following technical scheme: a shallow buried underground excavation tunnel foundation pit construction method under protection of a cover plate is characterized in that: the method comprises the following steps:
the method comprises the following steps: temporary pipeline moving and modifying, temporary traffic guiding and modifying, and constructing underground continuous walls, steel lattice columns and upright column piles;
step two: constructing a reinforced concrete crown beam, excavating a foundation pit to the bottom of a reinforced concrete cover plate, casting the reinforced concrete cover plate in situ, moving a municipal pipeline to the upper part of the reinforced concrete cover plate, backfilling and covering soil and recovering traffic;
step three: constructing grouting small guide pipes on the tunnel face corresponding to the first soil body area, grouting and reinforcing, excavating the first soil body area, constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step four: constructing grouting small guide pipes on the tunnel face corresponding to the second soil body area, grouting and reinforcing, excavating the second soil body area, constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step five: constructing a grouting small conduit on the tunnel face corresponding to the third soil body area, grouting and reinforcing, excavating the third soil body area, constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step six: constructing a grouting small conduit on the tunnel face corresponding to the fourth soil body area, grouting and reinforcing, excavating the fourth soil body area, constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step seven: constructing a grouting small conduit on the tunnel face corresponding to the fifth soil body area, grouting and reinforcing, excavating the fifth soil body area, constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step eight: constructing a grouting small conduit on the tunnel face corresponding to the sixth soil body area, grouting and reinforcing, excavating the sixth soil body area, constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step nine: constructing grouting small guide pipes on the tunnel face corresponding to the seventh soil body area and grouting and reinforcing the tunnel face, excavating the seventh soil body area, constructing temporary steel supports, constructing grouting small guide pipes on the foundation and grouting and reinforcing the foundation, and hanging nets and spraying concrete on the temporary steel supports;
step ten: constructing grouting small guide pipes on the tunnel face corresponding to the eighth soil body area and grouting and reinforcing the tunnel face, excavating the eighth soil body area, constructing temporary steel supports, constructing grouting small guide pipes on the foundation and grouting and reinforcing the foundation, and hanging nets and spraying concrete on the temporary steel supports;
step eleven: constructing grouting small guide pipes on the tunnel face corresponding to the ninth soil body area and grouting and reinforcing the tunnel face, excavating the ninth soil body area, constructing temporary steel supports, constructing grouting small guide pipes on the foundation and grouting and reinforcing the foundation, and hanging nets and spraying concrete on the temporary steel supports;
step twelve: laying a waterproof layer of the tunnel bottom plate, binding reinforcing steel bars and pouring the tunnel bottom plate;
step thirteen: dismantling a temporary steel support in a tunnel construction area, laying a waterproof layer of a tunnel side wall, binding steel bars and pouring the tunnel side wall and a tunnel middle wall;
fourteen steps: dismantling a temporary steel support in a tunnel roof construction area, laying a tunnel roof waterproof layer, binding steel bars and pouring a tunnel roof;
step fifteen: and backfilling the space between the reinforced concrete cover plate and the tunnel top plate.
The construction method of the shallow-buried underground tunnel foundation pit under the protection of the cover plate is characterized in that in the second step, before the construction of the cast-in-place reinforced concrete cover plate, steel bar planting bars are implanted between the reinforced concrete cover plate and the underground continuous wall.
The shallow-buried underground tunnel foundation pit construction method under the protection of the cover plate is characterized in that the temporary steel supports comprise a plurality of section steel supports, and two adjacent section steel supports are connected through a group of longitudinal connecting ribs.
The shallow-buried underground tunnel foundation pit construction method under the protection of the cover plate is characterized in that two groups of adjacent longitudinal connecting ribs are arranged in a vertically staggered mode.
The construction method of the shallow-buried underground excavation tunnel foundation pit under the protection of the cover plate is characterized in that in the fifteenth step, grouting materials or foam concrete are adopted for construction and backfilling.
The shallow-buried underground tunnel foundation pit construction method under the protection of the cover plate is characterized in that the excavation construction widths of the first soil body area, the second soil body area, the fourth soil body area, the fifth soil body area, the seventh soil body area and the eighth soil body area are 6.0-8.0m, and the construction length is 3.0-3.5 m.
By adopting the technology, compared with the prior art, the invention has the following beneficial effects:
the construction method adopts the underground continuous wall, the steel lattice column, the upright column pile and the reinforced concrete cover plate for advanced protection and recovers road traffic and municipal pipeline operation as soon as possible, then adopts construction modes of advanced grouting small ducts, fractional excavation, temporary profile steel support, reinforcing mesh injection concrete hanging and cast-in-place secondary lining reinforced concrete spraying from working wells at two ends, combines the designed construction region sequence, can carry out tunnel construction under the construction environment that the deep foundation pit engineering is close to the surrounding building or foundation pits are arranged along the edge, and reduces the road traffic influence on the construction region.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
fig. 2 is a schematic longitudinal sectional structure of the present invention.
In the figure: 1. a reinforced concrete crown beam; 2. a reinforced concrete cover plate; 3. a first soil area; 4. a second soil area; 5. a third soil area; 6. a fourth soil area; 7. a fifth soil body area; 8. a sixth soil region; 9. a seventh soil region; 10. an eighth soil area; 11. a ninth soil area; 13. grouting a small conduit; 14. a tunnel floor; 15. a tunnel middle wall; 16. a tunnel side wall; 17. a tunnel roof; 18. supporting the section steel; 19. longitudinal connecting ribs; A. an underground diaphragm wall; B. a steel lattice column; C. and (5) erecting a pile.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
Referring to fig. 1-2, a construction method of a shallow-buried underground tunnel foundation pit under protection of a cover plate includes the following steps:
the method comprises the following steps: temporarily moving the municipal pipeline out of a construction area, temporarily guiding and changing traffic to be out of a construction influence range, and constructing an underground continuous wall A, a steel lattice column B and a vertical column pile C;
step two: constructing a reinforced concrete crown beam 1, excavating a foundation pit to the bottom of a cover plate, implanting reinforcing steel bars between a reinforced concrete cover plate 2 and an underground continuous wall A, then casting the reinforced concrete cover plate 2 in situ, migrating municipal pipelines to the position above the reinforced concrete cover plate 2 in situ, backfilling and covering soil and recovering road traffic;
step three: constructing a grouting small conduit 13 on the tunnel face corresponding to the first soil body area 3, grouting and reinforcing, excavating the first soil body area 3, constructing temporary steel supports, hanging nets and spraying concrete on the temporary steel supports, wherein the excavation construction width of the first soil body area 3 is 6.0-8.0m, the construction length is 3.0-3.5m, and the construction precision can be improved to the maximum efficiency under the condition of ensuring the construction safety;
step four: after the construction of the first soil body area 3 is completed, a tunnel face corresponding to the second soil body area 4 is used as a small grouting guide pipe 13 and is grouted and reinforced, the second soil body area 4 is excavated, temporary steel supports are used, net hanging and concrete spraying are carried out on the temporary steel supports, the excavation construction width of the second soil body area 4 is 6.0-8.0m, the construction length is 3.0-3.5m, and the construction precision can be improved with the maximum efficiency under the condition of ensuring the construction safety;
step five: after the construction of the second soil body area 4 is completed, a tunnel face corresponding to the third soil body area 5 is used as a small grouting guide pipe 13 and is grouted and reinforced, the third soil body area 5 is excavated, temporary steel supports are used, net hanging and concrete spraying are carried out on the temporary steel supports, the excavation construction width of the third soil body area 5 is 6.0-8.0m, the construction length is 3.0-3.5m, and the construction precision can be improved with the maximum efficiency under the condition of ensuring the construction safety;
step six: after the construction of the third soil body area 5 is completed, a tunnel face corresponding to the fourth soil body area 6 is used as a small grouting guide pipe 13 and is grouted and reinforced, the fourth soil body area 6 is excavated, temporary steel supports are used, net hanging and concrete spraying are carried out on the temporary steel supports, the excavation construction width of the fourth soil body area 6 is 6.0-8.0m, the construction length is 3.0-3.5m, and the construction precision can be improved with the maximum efficiency under the condition of ensuring the construction safety;
step seven: after the construction of the fourth soil body area 6 is completed, a tunnel face corresponding to the fifth soil body area 7 is used as a small grouting guide pipe 13 and is grouted and reinforced, the fifth soil body area 7 is excavated, temporary steel supports are used, net hanging and concrete spraying are carried out on the temporary steel supports, the excavation construction width of the fifth soil body area 7 is 6.0-8.0m, the construction length is 3.0-3.5m, and the construction precision can be improved with the maximum efficiency under the condition of ensuring the construction safety;
step eight: after the construction of the fifth soil body area 7 is completed, a tunnel face corresponding to the sixth soil body area 8 is used as a small grouting guide pipe 13 and is grouted and reinforced, the sixth soil body area 8 is excavated, temporary steel supports are used, concrete is sprayed on the temporary steel supports in a net hanging mode, the excavation construction width of the sixth soil body area 8 is 6.0-8.0m, the construction length is 3.0-3.5m, and the construction precision can be improved to the maximum efficiency under the condition that the construction safety is ensured;
step nine: after the construction of the sixth soil body area 8 is completed, a tunnel face corresponding to the seventh soil body area 9 is used as a small grouting guide pipe 13 and is subjected to grouting reinforcement, the seventh soil body area 9 is excavated, temporary steel supports are used, a foundation is used as the small grouting guide pipe 13 and is subjected to grouting reinforcement, the temporary steel supports are subjected to net hanging and concrete spraying, the excavation construction width of the seventh soil body area 9 is 6.0-8.0m, the construction length is 3.0-3.5m, and the construction precision can be improved to the maximum efficiency under the condition of ensuring the construction safety;
step ten: after the construction of the seventh soil body area 9 is completed, working small grouting pipes 13 on the tunnel face corresponding to the eighth soil body area 10 and grouting reinforcement, excavating the eighth soil body area 10, working temporary steel supports, working small grouting pipes 13 on the foundation and grouting reinforcement, hanging net and spraying concrete on the temporary steel supports, wherein the excavation construction width of the eighth soil body area 10 is 6.0-8.0m, the construction length is 3.0-3.5m, and the construction precision can be improved with the maximum efficiency under the condition of ensuring the construction safety;
step eleven: after the eighth soil body area 10 is constructed, a tunnel face corresponding to a ninth soil body area 11 is used as a small grouting guide pipe 13 and is subjected to grouting reinforcement, the ninth soil body area 11 is excavated and is subjected to temporary steel support construction, a foundation is used as the small grouting guide pipe 13 and is subjected to grouting reinforcement, temporary steel supports are subjected to net hanging and concrete spraying, the excavation construction width of the ninth soil body area 11 is 6.0-8.0m, the construction length is 3.0-3.5m, and the construction precision can be improved to the maximum efficiency under the condition of ensuring the construction safety;
step twelve: laying a waterproof layer of the tunnel bottom plate 14, binding reinforcing steel bars and pouring the tunnel bottom plate 14;
step thirteen: dismantling temporary steel supports in construction areas of the tunnel side wall 16 and the tunnel middle wall 15, laying a side wall waterproof layer, binding reinforcing steel bars and pouring the tunnel side wall and the middle wall 15;
fourteen steps: dismantling the temporary steel support in the construction area of the tunnel top plate 17, laying a waterproof layer of the tunnel top plate 17, binding steel bars and pouring the tunnel top plate 17;
step fifteen: and (3) construction and backfilling are carried out in the space between the reinforced concrete cover plate 2 and the tunnel top plate 17 by adopting grouting materials or foam concrete.
The temporary steel support used in construction comprises a plurality of steel supports 18, two adjacent steel supports 18 are connected through a set of longitudinal connecting ribs 19, and two sets of adjacent longitudinal connecting ribs 19 are arranged in a staggered mode from top to bottom, so that connection is facilitated, and the stability of the structure is enhanced.
During construction, the first soil body area 3, the second soil body area 4 and the third soil body area 5 are constructed in a staggered mode; staggered construction is carried out among the fourth soil body area 6, the fifth soil body area 7 and the sixth soil body area 8; constructing the seventh soil body area 9, the eighth soil body area 10 and the ninth soil body area 11 in a staggered manner;
according to the construction method, according to the construction mode of a shallow-buried underground excavation method along with excavation and supporting, the underground continuous wall A, the steel lattice column B, the upright column pile C and the reinforced concrete cover plate 2 are adopted for advanced protection, and road traffic and municipal pipeline operation are recovered in the second construction step, then, the construction modes of advanced grouting small pipes 13, fractional excavation, temporary steel supports, reinforcing mesh hanging and concrete spraying and cast-in-place secondary lining reinforced concrete are adopted from working wells at two ends, and tunnel construction can be carried out under the construction environment that deep foundation pit engineering is close to peripheral building structures or foundation pits are arranged along the edges by combining the designed construction region sequence, and meanwhile, the road traffic influence on the construction region is reduced.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A shallow buried underground excavation tunnel foundation pit construction method under protection of a cover plate is characterized in that: the method comprises the following steps:
the method comprises the following steps: temporary pipeline moving and modifying, temporary traffic guiding and modifying, construction of underground continuous walls (A), steel lattice columns (B) and upright column piles (C);
step two: constructing a reinforced concrete crown beam (1), excavating a foundation pit to the bottom of a reinforced concrete cover plate (2), casting the reinforced concrete cover plate (2) in situ, moving a municipal pipeline to the position above the reinforced concrete cover plate (2), backfilling and covering soil and recovering traffic;
step three: constructing grouting small guide pipes (13) on the tunnel face corresponding to the first soil body area (3), grouting and reinforcing, excavating the first soil body area (3), constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step four: constructing grouting small guide pipes (13) on the tunnel face corresponding to the second soil body area (4), grouting and reinforcing, excavating the second soil body area (4), constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step five: constructing grouting small guide pipes (13) on the tunnel face corresponding to the third soil body area (5), grouting and reinforcing, excavating the third soil body area (5), constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step six: constructing a small grouting guide pipe (13) on the tunnel face corresponding to the fourth soil body area (6), grouting and reinforcing, excavating the fourth soil body area (6), constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step seven: constructing a small grouting guide pipe (13) on the tunnel face corresponding to the fifth soil body area (7), grouting and reinforcing, excavating the fifth soil body area (7), constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step eight: constructing a small grouting guide pipe (13) on the tunnel face corresponding to the sixth soil body area (8), grouting and reinforcing, excavating the sixth soil body area (8), constructing temporary steel supports, and hanging nets and spraying concrete on the temporary steel supports;
step nine: constructing grouting small guide pipes (13) on the tunnel face corresponding to the seventh soil body area (9) and grouting and reinforcing, excavating the seventh soil body area (9), constructing temporary steel supports, constructing grouting small guide pipes (13) on the substrate and grouting and reinforcing, and hanging nets and spraying concrete on the temporary steel supports;
step ten: constructing grouting small guide pipes (13) on the tunnel face corresponding to the eighth soil body area (10) and grouting and reinforcing, excavating the eighth soil body area (10), constructing temporary steel supports, constructing grouting small guide pipes (13) on the substrate and grouting and reinforcing, and hanging nets and spraying concrete on the temporary steel supports;
step eleven: constructing grouting small guide pipes (13) on the tunnel face corresponding to the ninth soil body area (11) and grouting and reinforcing, excavating the ninth soil body area (11), constructing temporary steel supports, constructing grouting small guide pipes (13) on the substrate and grouting and reinforcing, and hanging nets and spraying concrete on the temporary steel supports;
step twelve: laying a waterproof layer of the tunnel bottom plate (14), binding reinforcing steel bars and pouring the tunnel bottom plate (14);
step thirteen: dismantling temporary steel supports in a tunnel construction area, laying a waterproof layer of a tunnel side wall, binding steel bars and pouring a tunnel side wall (16) and a tunnel middle wall (15);
fourteen steps: dismantling temporary steel supports in a construction area of a tunnel top plate (17), laying a waterproof layer of the tunnel top plate (17), binding reinforcing steel bars and pouring the tunnel top plate (17);
step fifteen: and constructing and backfilling in a space between the reinforced concrete cover plate (2) and the tunnel top plate (17).
2. The construction method of the shallow-buried underground tunnel foundation pit under the protection of the cover plate according to claim 1, characterized in that in the second step, before the construction of the cast-in-place reinforced concrete cover plate (2), steel bar planting bars are implanted between the reinforced concrete cover plate (2) and the underground continuous wall (A).
3. The construction method of the shallow underground excavation tunnel foundation pit under the protection of the cover plate according to claim 1, characterized in that the temporary steel supports comprise a plurality of steel supports, and two adjacent steel supports (18) are connected through a set of longitudinal connecting ribs (19).
4. The construction method of the shallow-buried underground tunnel foundation pit under the protection of the cover plate according to claim 3, characterized in that the two groups of adjacent longitudinal connecting ribs (19) are arranged in a vertically staggered manner.
5. The construction method of the shallow-buried underground excavation tunnel foundation pit under the protection of the cover plate as claimed in claim 1, wherein in the fifteenth step, construction backfilling is performed by using grouting material or foam concrete.
6. The construction method of the shallow underground excavation tunnel foundation pit under the protection of the cover plate according to claim 1, characterized in that the excavation construction width of the first soil body area (3), the second soil body area (4), the fourth soil body area (6), the fifth soil body area (7), the seventh soil body area (9) and the eighth soil body area (10) is 6.0-8.0m, and the construction length is 3.0-3.5 m.
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| CN114086563A (en) * | 2021-11-27 | 2022-02-25 | 哈尔滨工业大学 | Construction method for improving bearing capacity of soil body right above shallow tunnel |
| CN114775622A (en) * | 2022-05-18 | 2022-07-22 | 中铁二十二局集团有限公司 | Construction method of special-shaped deep foundation pit with construction space limitation of adjacent building structure |
| CN115341576A (en) * | 2022-09-19 | 2022-11-15 | 中铁第六勘察设计院集团有限公司 | Control method and device for inducing uplift deformation of underlying tunnel by foundation pit excavation |
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| CN111677515A (en) * | 2020-05-20 | 2020-09-18 | 中铁二院工程集团有限责任公司 | Construction method for breaking open cut foundation pit wall into hole from pile support supporting system by adopting shallow-buried underground excavation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114086563A (en) * | 2021-11-27 | 2022-02-25 | 哈尔滨工业大学 | Construction method for improving bearing capacity of soil body right above shallow tunnel |
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| CN115341576A (en) * | 2022-09-19 | 2022-11-15 | 中铁第六勘察设计院集团有限公司 | Control method and device for inducing uplift deformation of underlying tunnel by foundation pit excavation |
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