CN105862930A - Protection structure on existing tunnel below new underground engineering - Google Patents
Protection structure on existing tunnel below new underground engineering Download PDFInfo
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- CN105862930A CN105862930A CN201610379597.4A CN201610379597A CN105862930A CN 105862930 A CN105862930 A CN 105862930A CN 201610379597 A CN201610379597 A CN 201610379597A CN 105862930 A CN105862930 A CN 105862930A
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- steel pipe
- existing tunnel
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- 238000009412 basement excavation Methods 0.000 claims abstract description 33
- 238000010276 construction Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000004567 concrete Substances 0.000 claims description 21
- 230000003014 reinforcing effect Effects 0.000 claims description 12
- 239000002689 soil Substances 0.000 claims description 11
- 230000010412 perfusion Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- -1 upper rib 8 Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F11/00—Rescue devices or other safety devices, e.g. safety chambers or escape ways
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Pulmonology (AREA)
- Emergency Management (AREA)
- Health & Medical Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Business, Economics & Management (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to the technical field of construction of underground engineering, and in particular relates to a protection structure on an existing tunnel below new underground engineering. The protection structure comprises a plurality of uplift piles and a steel tube, wherein the plurality of uplift piles are located at the left side and right side of the extension direction of the existing tunnel; the steel tube is arranged at the upper part of the existing tunnel; the uplift piles at the same side of the existing tunnel are sequentially and evenly arranged at intervals; and the steel tube is fixed at the upper end of two opposite uplift piles at two sides of the existing tunnel. The protection structure aims at overcoming the disadvantages and defects and solving the problem of excavation of a foundation pit at the upper part of the existing tunnel. The excavation and protection method for the existing tunnel is provided. Therefore, the effects of sealing the operating tunnel before excavation of the foundation pit at the upper part and achieving zero disturbance on the existing tunnel in excavation of the foundation pit are achieved.
Description
Technical field
The present invention relates to underground engineering builds technical field, in particular to a kind of to the protection structure of existing tunnel below newly-built underground engineering.
Background technology
Construction along with urban rail traffic project, in each big city, main city zone has all built substantial amounts of Tunnel Engineering, when later stage carries out Urban Underground Space Excavation or urban road tunnel construction above existing tunnel, the unloading of stratum soil excavation can cause existing tunnel upwards to swell along with the resilience of the soil body.In order to reduce the protuberance of existing tunnel; the most employings are to both sides, tunnel and top grouting in soil mass or stir reinforcement protection; and uplift pile is set in both sides, tunnel takes into account certain buffer action; then piecemeal carries out pouring of soil excavation and newly-built structure; by increasing ground stiffness layer, reducing each excavation area, utilize tau-effect to reduce the uplift capacity in tunnel.Such as engineerings such as tunnel, Long Pan road, Nanjing, Shanghai Dongfang Road lower cervical spine engineering, oasis, Spora Lygodii lake, Hangzhou subsidence observation engineerings, all have employed similar construction method.
After existing construction method tunnel upper soil excavation, excavation pit bottom surface in the vertical direction does not retrain, so the protuberance on stratum, lower section can not fundamentally be avoided.Foundation ditch piecemeal excavation can utilize the tau-effect that foundation ditch bottom soil body is swelled in theory, reduces uplift capacity, but owing to reducing efficiency of construction, adds the most again at the bottom of foundation ditch open-assembly time, finally very limited to the control action of pit accident.From the point of view of practice effect, the lower section tunnel heaving amount caused during engineering soil excavation is partly descended to exceed the permission shift standards of tunnel normal operation.
It is proposed around tunnel, forms concrete protective shell in advance, reduce the protuberance of the existing tunnel that excavation of foundation pit causes.nullChinese invention patent such as entitled " a kind of foundation ditch on top of underground railway tunnel excavation method " of Patent No. " CN104532849A "，The patent describe a kind of use diaphram wall coordinate jacking tube coupling and coordinate cast in place concrete plate to form containment vessel，Then the construction method of excavation section by section carries out the method for protection on existing tunnel，First the method builds safeguard structure in the both sides of existing tunnel，This safeguard structure is the reinforced concrete wall that tube pile structure is formed with concreting，Jacking is used to be laid in above existing tunnel by tube coupling again above existing tunnel，Casting concrete pour integral structure with the diaphram wall of both sides in push pipe，Complete to protect the construction of structure，Then the place apart from this protection structure 5m starts to construct second and protects structure，Between push pipe, the space of 5 meters is connected by cast-in-place concrete，Alternation excavation the most successively.The method utilizes the push pipe of vertical diaphram wall and level to be collectively forming protection structure, is then reduced the quantities of excavation every time by interval construction, reduces the probability of tunnel heaving.But during the method tunnel both sides construction of diaphragm wall, the impact on existing tunnel is very big, easily causes tunnel occurred level displacement and horizontal ovalizing deflection；It addition, subway sectional tunnel is parallel two tunnel in Practical Project, this will make to protect the span of horizontal concrete slab in structure too big, and when bottom-up protuberance, concrete slab is along with arching upward.If by the thickness resistance to deformation increasing plate, concrete slab thickness at least needs more than 3 meters, which greatly increases construction investment and difficulty of construction, is unfavorable for promoting the use of.
Summary of the invention
The efficiency of construction that the protection scheme that existing alternation excavation, section construction technology and the existing invention that present invention aim to solve mention in above-mentioned background technology proposes exists is low; the problems such as protected effect difference and scheme exploitativeness difference, it is provided that a kind of new to the protection structure of existing tunnel below underground engineering.
The technical scheme is that a kind of to the protection structure of existing tunnel below newly-built underground engineering; it is characterized in that: include being positioned at many uplift piles of the existing tunnel bearing of trend left and right sides and be set up in the steel pipe above existing tunnel; the uplift pile being positioned at existing tunnel homonymy is spaced evenly distributed successively, and steel pipe is fixed on the upper end of two relative uplift piles of existing tunnel both sides.
The most described steel pipe and corresponding position, uplift pile upper end offer opening, and uplift pile upper end is provided with the reinforcing bar being arranged in this opening, and uplift pile forms overall structure with steel pipe by reinforcing bar together with concreting.
The most described reinforcing bar is L-type structure, and the lower rib extending in uplift pile including the length direction layout along uplift pile and the length direction along steel pipe are arranged and extend in steel pipe the upper rib hooking steel pipe from steel pipe opening part.
The most described pipe diameter meets personnel and carries out pipe cutting job requirements.
Between further adjacent steel pipe, spacing distance is 20～30cm
A kind of existing tunnel below newly-built underground engineering is protected the construction method of structure, it is characterised in that: comprise the following steps:
1, armored concrete uplift pile is set at interval, the both sides of existing tunnel bearing of trend；
2, working pit is originated, in opposite side uplift pile away from excavating the reception working pit corresponding with originating working pit on ground, existing tunnel side in side uplift pile away from excavation push pipe on the ground, side of existing tunnel；
3, push bench process is used to be pushed in reception working pit from originating working pit steel pipe one end；
4, artificial casting concrete formation steel tube concrete beam in steel pipe, and the uplift pile corresponding with existing tunnel both sides is fixed together；
5, constructing successively, be connected until all of steel tube concrete beam is fixing with the upper end of uplift pile, form the protection structure of existing tunnel, the then soil body above excavation steel pipe, underground structure is planned to build in construction.
The most described step is manually entered in steel pipe, first steel pipe is cut open with junction, uplift pile upper end, rib under the upper end of uplift pile is implanted again, upper rib is extend in steel pipe from the opening cut open, finally in steel pipe and uplift pile concrete perfusion by uplift pile, lower rib, on rib and steel pipe be fixedly connected as overall structure.
Advantages of the present invention has: along with the fast development in city, city space is more and more nervous, inevitably runs into the situation building foundation ditch above operation tactics in Process of Urban Development.In traditional method; to retain above operation tunnel and be undisturbed the soil body in a large number; the method that the inventive method builds protection structure by outside at existing tunnel in advance; can effectively prevent the problem that the existing tunnel caused because of excavation swells; excavation of foundation pit can be excavated to the position of 2～3m above tunnel roof, it is possible to utilizes the underground space to greatest extent.
Building in the work progress of the protection structure outside existing tunnel, each construction procedure is the least to the disturbance of existing tunnel, is greatly improved the security reliability during subway tunnel operation.
The existing tunnel protection structure that the present invention builds can be along the most arbitrarily extension of existing tunnel; therefore need not use the construction method of excavation section by section; the foundation ditch of the present invention can disposably excavate and not worry the problem that tunnel heaving deforms, and drastically increases the progress of foundation pit construction and the globality of structure.
In addition; the inventive method goes for several the parallel situations in tunnel, by setting up uplift pile between parallel tunnels, and is connected with the concrete filled steel tube of level; reduce the span of level protection structure, can prevent level protection structure from producing excessive arching upward with landing surface protuberance.
In general; it is an object of the invention to overcome above-mentioned deficiency and defect; solve excavation of foundation pit above current operation tunnel and existing tunnel affected problem, propose a kind of guard method to operation tunnel, it is achieved excavation of foundation pit effect the most undisturbed to operation tunnel.
Accompanying drawing explanation
The structural representation of Fig. 1: the step 1 of the present embodiment；
The structural representation of Fig. 2: the step 2 of the present embodiment；
The structural representation of Fig. 3: the step 3 of the present embodiment；
The structural representation of Fig. 4: the step 4 of the present embodiment；
The structural representation of Fig. 5: the step 5 of the present embodiment；
The A-A view of Fig. 5 of Fig. 6: the present invention；
Wherein: 1 existing tunnel；2 uplift piles；3 originate working pit；4 receive working pit；5 steel pipes；6 underground structures；7 excavation pits；Rib on 8；9 times ribs.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Such as Fig. 1～5; the protection structure of the present embodiment is " π " type frame structure; including the many uplift piles 2 for existing tunnel 1 bearing of trend both sides; the uplift pile 2 being positioned at existing tunnel 1 homonymy is spaced evenly distributed successively; uplift pile 2 is centered around the left and right sides of existing tunnel 1 (as shown in Figure 1; the left and right sides of existing tunnel is the left and right directions of existing tunnel 1 in figure), uplift pile 2 is not less than 1m apart from the distance of existing tunnel 1.The uplift pile 2 of existing tunnel 1 both sides is positioned opposite, and the upper end of uplift pile 2 is provided with steel pipe 5, and steel pipe 5 is the steel-tube construction being set up between excavation pit 7 and existing tunnel 1, uses push bench process that steel pipe 5 is arranged on the top of existing tunnel 1.
The construction method of uplift pile 2 is: first hole in the both sides of existing tunnel 1, then irrigates armored concrete in hole and forms uplift pile 2.Uplift pile 2 is reinforced concrete structure, perfusion mortar in the hole of uplift pile 2 upper end, it is simple to the jacking construction of steel pipe 5.
In steel pipe 5, concrete perfusion forms steel tube concrete beam; the middle part of beam is separately fixed at uplift pile 2 upper end of the correspondence position of existing tunnel 1 both sides; " π " type frame structure is formed with two uplift piles 2; along existing tunnel 1 bearing of trend arrangement multiple " π " type frame structure; being spaced 20～30cm between adjacent " π " type frame structure, multiple " π " type frame structure is formed and is centered around the protection structure outside existing tunnel 1.
Steel pipe 5 just position to uplift pile 2 offers opening, and reinforcing bar is implanted in the upper end of anti-tabular 2, and reinforcing bar is fixed in uplift pile 2 and steel pipe 5 by concreting, formation overall structure, as shown in Figure 4.Reinforcing bar includes the upper rib 8 that the lower rib 9 arranged along the length direction of uplift pile 2 and the length direction along steel pipe 5 are arranged, lower rib 9 is cast in uplift pile 2, upper rib 8 is cast in steel pipe 5, and upper rib 8 is fixed on the upper end of lower rib 9 and forms L-type structure with lower rib 9.
Concrete work progress comprises the following steps:
1 as it is shown in figure 1, arrange reinforcing bar uplift pile 2 at interval, the both sides of existing tunnel 1 bearing of trend, and uplift pile 2 uses drill-pouring method to construct, and the bearing of trend along existing tunnel 1 is arranged successively；
2, as shown in Figure 2, working pit 3 is originated away from excavation push pipe on the ground, side of existing tunnel 1 in side uplift pile 2, in opposite side uplift pile 2 away from excavating the reception working pit 4 corresponding with originating working pit 3 on ground, existing tunnel 1 side, the both sides originating working pit 3 and receive working pit 4 and lay respectively at excavation pit 7, the top of existing tunnel 1 it is not on owing to originating working pit 3 and reception working pit 4, excavation the two hole can't cause the protuberance of existing tunnel 1 to deform, and the both sides of existing tunnel 1 are already provided with uplift pile 2, uplift pile 2 forms lateral protection structure, it also is able to prevent existing tunnel 1 to both sides occurred level displacement；
3 as it is shown on figure 3, use push bench process to be pushed in reception working pit 4 from originating working pit 3 steel pipe 5 one end, and steel pipe 5 is perpendicular to the bearing of trend of existing tunnel 1, and steel pipe 5 passes from the mortar of uplift pile 2 upper end；
4, as shown in Figure 4, the uplift pile 2 that steel pipe 5 is relative with two of existing tunnel 1 both sides is fixed together formation " π " shape framework, concrete operation is, staff enters in steel pipe 5, steel pipe 5 is cut open with junction, uplift pile 2 upper end, then implants reinforcing bar in the upper end of uplift pile 2, upper rib 8 is inserted in the steel pipe 5 cut open, at casting concrete, upper rib 8, steel pipe 5, lower rib 9 and uplift pile 2 are poured and be fixed together, concrete perfusion in steel pipe 5；
5 as it is shown in figure 5, construct successively, is connected until all of steel pipe 5 is fixing with the upper end of uplift pile 2, and the soil body above excavation steel pipe 5, underground structure 6 is planned to build in construction.
The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; the principle that the present invention is simply described described in above-described embodiment and description; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements both fall within scope of the claimed invention.Claimed scope is defined by appending claims and equivalent thereof.
Claims (7)
1., to a protection structure for existing tunnel below newly-built underground engineering, its feature exists
In: many uplift piles (2) including being positioned at existing tunnel (1) the bearing of trend left and right sides and
It is set up in the steel pipe (5) of existing tunnel (1) top, is positioned at the anti-of existing tunnel (1) homonymy
Pile pulling (2) is spaced evenly distributed successively, and steel pipe (5) is fixed on existing tunnel (1) both sides
The upper end of two relative uplift piles (2).
A kind of to the guarantor of existing tunnel below newly-built underground engineering
Protection structure, it is characterised in that: described steel pipe (5) is opened with uplift pile (2) corresponding position, upper end
Being provided with opening, uplift pile (2) upper end is provided with the reinforcing bar being arranged in this opening, uplift pile
(2) overall structure is formed with steel pipe (5) together with concreting by reinforcing bar.
A kind of to the guarantor of existing tunnel below newly-built underground engineering
Protection structure, it is characterised in that: described reinforcing bar is L-type structure, including along uplift pile (2)
The lower rib (9) extending in uplift pile (2) arranged of length direction and along steel pipe (5)
Length direction arrange to extend in steel pipe (5) from steel pipe (5) opening part and hook steel pipe (5)
Upper rib (8).
A kind of to the guarantor of existing tunnel below newly-built underground engineering
Protection structure, it is characterised in that: described steel pipe (5) internal diameter meets personnel's entrance and cuts
Steel pipe job requirements.
A kind of to the guarantor of existing tunnel below newly-built underground engineering
Protection structure, it is characterised in that: between adjacent steel pipe (5), spacing distance is 20～30cm.
6. an one as claimed in claim 1 is to existing tunnel below newly-built underground engineering
The construction method of protection structure, it is characterised in that: comprise the following steps:
1), reinforcing bar uplift pile (2) is set at interval, the both sides of existing tunnel (1) bearing of trend；
2), in side uplift pile (2) away from excavation top on the ground, side of existing tunnel (1)
Pipe originates working pit (3), in opposite side uplift pile (2) away from ground, existing tunnel (1) side
The reception working pit (4) corresponding with originating working pit (3) is excavated on face；
3), use push bench process that from originating working pit (3), steel pipe (5) one end is pushed into reception
In working pit (4)；
4), it is manually entered steel pipe (5) and existing tunnel (1) both sides in steel pipe (5)
Two relative uplift piles (2) be fixed together；
5), constructing successively, the upper end until all of steel pipe (5) with uplift pile (2) is fixed
Connecting, excavation steel pipe (5) the top soil body, underground structure (6) is planned to build in construction.
7. as claimed in claim 6 a kind of as claimed in claim 1 a kind of to newly-built
The construction method of the protection structure of existing tunnel below lower engineering, it is characterised in that: described step
Rapid 4) it is manually entered in steel pipe (5), first by steel pipe (5) and uplift pile (2)
End junction cuts open, then rib (9) under the upper end of uplift pile (2) is implanted, by upper rib
(8) it extend into from the opening cut open in steel pipe (5), finally at steel pipe (5) and resistance to plucking
In stake (2), concrete perfusion is by uplift pile (2), lower rib (9), upper rib (8) and steel
Pipe (5) is fixedly connected as overall structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610379597.4A CN105862930B (en) | 2016-05-31 | 2016-05-31 | A kind of protection structure to creating existing tunnel below underground engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610379597.4A CN105862930B (en) | 2016-05-31 | 2016-05-31 | A kind of protection structure to creating existing tunnel below underground engineering |
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| Publication Number | Publication Date |
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| CN105862930A true CN105862930A (en) | 2016-08-17 |
| CN105862930B CN105862930B (en) | 2018-05-15 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108517871A (en) * | 2018-03-15 | 2018-09-11 | 大连交通大学 | A kind of control excavation of foundation pit induces the structure and its construction method of tunnel upward floating |
| CN109235507A (en) * | 2018-10-26 | 2019-01-18 | 中铁四局集团第工程有限公司 | A kind of stratum consolidation system and method for reinforcing existing tunnel |
| CN110241863A (en) * | 2019-07-06 | 2019-09-17 | 福建省水利水电勘测设计研究院 | Soft soil foundation excavation process piping lane deformation controller in hole and its control method |
| CN110409418A (en) * | 2019-06-12 | 2019-11-05 | 苏州市轨道交通集团有限公司 | Foundation Reinforcement Structure and Construction Method for Controlling Deformation of Existing Subway Tunnel |
| CN110725344A (en) * | 2019-10-25 | 2020-01-24 | 安徽省城建设计研究总院股份有限公司 | Method for preventing existing tunnel from floating upwards during earthwork unloading |
| CN110952563A (en) * | 2019-12-05 | 2020-04-03 | 广州地铁设计研究院股份有限公司 | Temporary anti-floating structure for excavation of foundation pit above existing subway tunnel |
| CN112112167A (en) * | 2020-09-01 | 2020-12-22 | 深圳市综合交通设计研究院有限公司 | A kind of foundation pit supporting structure of limited height section and construction method thereof |
| CN112523265A (en) * | 2020-11-27 | 2021-03-19 | 广州地铁设计研究院股份有限公司 | Protective structure for excavating foundation pit and spanning existing tunnel and construction method thereof |
| CN113685205A (en) * | 2021-09-22 | 2021-11-23 | 中铁隧道股份有限公司 | Rotary spraying lifting structure and construction method |
| CN114541408A (en) * | 2022-03-03 | 2022-05-27 | 中铁四局集团有限公司 | The structure of the upper air-containing shaft in front of the end well of the underground station and the construction method of its penetration |
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| CN111218938A (en) * | 2020-01-07 | 2020-06-02 | 中国建筑第八工程局有限公司 | Excavation construction method for foundation pit above existing tunnel |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108517871A (en) * | 2018-03-15 | 2018-09-11 | 大连交通大学 | A kind of control excavation of foundation pit induces the structure and its construction method of tunnel upward floating |
| CN109235507B (en) * | 2018-10-26 | 2023-09-22 | 中铁四局集团第一工程有限公司 | A ground reinforcement system and method for reinforcing existing tunnels |
| CN109235507A (en) * | 2018-10-26 | 2019-01-18 | 中铁四局集团第工程有限公司 | A kind of stratum consolidation system and method for reinforcing existing tunnel |
| CN110409418A (en) * | 2019-06-12 | 2019-11-05 | 苏州市轨道交通集团有限公司 | Foundation Reinforcement Structure and Construction Method for Controlling Deformation of Existing Subway Tunnel |
| CN110241863A (en) * | 2019-07-06 | 2019-09-17 | 福建省水利水电勘测设计研究院 | Soft soil foundation excavation process piping lane deformation controller in hole and its control method |
| CN110241863B (en) * | 2019-07-06 | 2024-04-16 | 福建省水利水电勘测设计研究院有限公司 | Soft soil foundation pit excavation process pipe gallery deformation control device and control method thereof |
| CN110725344A (en) * | 2019-10-25 | 2020-01-24 | 安徽省城建设计研究总院股份有限公司 | Method for preventing existing tunnel from floating upwards during earthwork unloading |
| CN110952563A (en) * | 2019-12-05 | 2020-04-03 | 广州地铁设计研究院股份有限公司 | Temporary anti-floating structure for excavation of foundation pit above existing subway tunnel |
| CN112112167A (en) * | 2020-09-01 | 2020-12-22 | 深圳市综合交通设计研究院有限公司 | A kind of foundation pit supporting structure of limited height section and construction method thereof |
| CN112523265A (en) * | 2020-11-27 | 2021-03-19 | 广州地铁设计研究院股份有限公司 | Protective structure for excavating foundation pit and spanning existing tunnel and construction method thereof |
| CN113685205A (en) * | 2021-09-22 | 2021-11-23 | 中铁隧道股份有限公司 | Rotary spraying lifting structure and construction method |
| CN114541408A (en) * | 2022-03-03 | 2022-05-27 | 中铁四局集团有限公司 | The structure of the upper air-containing shaft in front of the end well of the underground station and the construction method of its penetration |
| CN114541408B (en) * | 2022-03-03 | 2023-06-02 | 中铁四局集团有限公司 | Front upper part wind-containing well structure of underground station end well and underpass construction method thereof |
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| CN105862930B (en) | 2018-05-15 |
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