CN220909725U - Tunnel preliminary bracing steel frame construction - Google Patents
Tunnel preliminary bracing steel frame construction Download PDFInfo
- Publication number
- CN220909725U CN220909725U CN202321969621.1U CN202321969621U CN220909725U CN 220909725 U CN220909725 U CN 220909725U CN 202321969621 U CN202321969621 U CN 202321969621U CN 220909725 U CN220909725 U CN 220909725U
- Authority
- CN
- China
- Prior art keywords
- unit area
- primary support
- steel frame
- tunnel
- arch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 111
- 239000010959 steel Substances 0.000 title claims abstract description 111
- 238000010276 construction Methods 0.000 title abstract description 15
- 239000004567 concrete Substances 0.000 claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 238000009412 basement excavation Methods 0.000 abstract description 10
- 239000011435 rock Substances 0.000 abstract description 9
- 230000007547 defect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model discloses a tunnel primary support steel frame structure, which comprises a first unit area, a second unit area, a third unit area and a fourth unit area which are sequentially excavated along the longitudinal direction of a tunnel, wherein the bottom surface of the excavated area is connected to form a downward step shape, permanent primary support steel frames are arranged at the top and two sides of the excavated area, foot locking anchor pipes are arranged at the steel frame nodes, and a temporary inverted arch steel frame is transversely arranged at the bottom of the second unit area; and concrete is arranged on the inner side of the permanent primary support steel frame, and arch wall secondary lining concrete is poured on the inner side of the arch wall of the fourth unit area. According to the utility model, the step-shaped excavation area is gradually formed, and the primary support is timely constructed and sealed into a ring, so that a stable support system is formed at each constructed position as early as possible, the problems of large deformation, serious settlement and the like of surrounding rock after tunnel excavation are reduced or avoided, the stress performance of the primary support is effectively improved, the tunnel construction progress is normal, and the continuity and safety of construction are ensured.
Description
Technical Field
The utility model belongs to the field of tunnel construction equipment, and particularly relates to a tunnel primary support steel frame structure.
Background
Along with the development of the economy in China, a large amount of soft soil is greatly deformed to undercut the tunnel engineering, and particularly the shallow underground excavation subway tunnel in urban subway construction is started or is about to be constructed sequentially. In shallow underground tunnel construction, surrounding rock is easy to deform due to poor self-stabilizing capability of surrounding rock after tunnel excavation, so that instability of an excavation surface and larger earth surface subsidence are caused, and therefore, tunnel design and construction in difficult strata are very critical, and stability problems of a working surface and control of stratum deformation are very critical.
The existing tunnel primary support steel frame adopts a primary support I20 b steel frame, and in soft soil and shallow buried underground excavation tunnel construction, surrounding rock is easy to deform greatly due to poor self-stabilization capability of surrounding rock after excavation due to shallow tunnel burying and complicated geology, the problems of serious settlement, collapse, roof collapse and the like are solved, and the support strength of the surrounding rock is required to be improved by adopting a support steel frame with higher rigidity so as to ensure the stability and reliability of primary support.
Disclosure of utility model
In order to overcome the defects and shortcomings in the prior art, the utility model aims to provide a tunnel primary support steel frame structure.
The utility model is realized in such a way that a tunnel primary support steel frame structure comprises a first unit area, a second unit area, a third unit area and a fourth unit area which are sequentially excavated along the longitudinal direction of a tunnel, wherein the bottom surfaces of the first unit area, the second unit area, the third unit area and the fourth unit area are connected to form a downward step shape, permanent primary support steel frames are arranged at the top and two sides of the first unit area, the second unit area and the third unit area, permanent primary support steel frames are arranged at the top, two sides and the bottom of the fourth unit area, foot locking anchor pipes are arranged at steel frame nodes of the permanent primary support steel frames, arch advanced supports are arranged at the top of the permanent primary support steel frames, temporary inverted arch steel frames are transversely arranged at the bottom of the second unit area, two ends of each temporary inverted arch steel frame are connected with the permanent primary support steel frames, and each steel frame section of each permanent primary support steel frame is connected by high-strength bolts; and arch wall concrete is sprayed on the inner sides of the permanent primary support steel frames in the first unit area, the second unit area, the third unit area and the fourth unit area, bottom plate concrete is poured on the inner sides of the permanent primary support steel frames at the bottom in the fourth unit area, and arch wall secondary lining concrete is poured on the inner sides of the arch walls in the fourth unit area.
Preferably, the adjacent steel frames at the arch foot positions of the permanent primary support steel frames are connected with longitudinal connecting steel plates, and the longitudinal connecting steel plates are welded with the permanent primary support steel frames to form a whole, so that the support rigidity is increased, uneven settlement is slowed down, and the cracking of the sprayed concrete of the primary support is prevented.
Preferably, the steel frame sections of the temporary inverted arch steel frames are connected by steel channels in pairs, and the interval between the adjacent steel frame sections connected with the steel channels is 1.5m.
Preferably, a temporary inverted arch steel frame is transversely arranged at the bottom of the first unit area.
Preferably, the included angle between the foot locking anchor pipe and the permanent primary support steel frame is 45 ℃.
Preferably, the arch parts and the side walls of the first unit area, the second unit area, the third unit area and the fourth unit area are provided with reinforcing mesh pieces, and the reinforcing mesh pieces are reinforcing mesh pieces with phi 8@20×20cm.
Preferably, the permanent primary support steel frame and the temporary inverted arch steel frame are both I22 b steel frames, and the support strength is remarkably improved under the condition of less weight and cost increase.
Compared with the defects and shortcomings of the prior art, the utility model has the following beneficial effects: the step-shaped excavation area is gradually formed, the excavated cavern is rapidly sealed into a ring in limited space and time, so that a stable support system can be formed as early as possible by the support steel frames at all constructed positions, the safety and quality problems of surrounding rock large deformation, serious settlement, collapse, roof collapse and the like caused by tunnel excavation are reduced or avoided, the support steel frames can be more suitable for primary supports of surrounding rock which are easy to generate large deformation, the stress performance of the primary supports is effectively improved, the stability and reliability of the primary supports are ensured, the tunnel construction progress is normal, and the quality and the safety are controllable.
Drawings
FIG. 1 is a schematic view of a tunnel primary support steel frame structure provided by an embodiment of the utility model;
Fig. 2 is a side view of a tunnel primary support steel frame structure provided by an embodiment of the present utility model;
fig. 3 is a schematic view of a longitudinal connecting steel plate according to an embodiment of the present utility model.
In the figure: 1-a first cell region; 2-a second cell region; 3-a third cell region; 4-a fourth cell region; 5. 7, 9 and 10 permanent primary support steel frames; 6. 8-temporary inverted arch steel frame; 11-floor concrete; 12-arch wall concrete; 13-locking the pin anchor tube; 14-arch advance support; 15-secondary lining concrete of the arch wall; 16-longitudinal connecting steel plates.
Description of the embodiments
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1-2, the tunnel primary support steel frame structure provided by the utility model comprises a first unit area 1, a second unit area 2, a third unit area 3 and a fourth unit area 4 which are sequentially excavated along the longitudinal direction of a tunnel, wherein the bottom surfaces of the first unit area 1, the second unit area 2, the third unit area 3 and the fourth unit area 4 are connected to form a downward step shape, each unit area is excavated, a permanent primary support steel frame 5/7/9/10 and a foot locking anchor pipe 13 are timely constructed, the foot locking anchor pipes 13 are arranged at steel frame nodes of the permanent primary support steel frame 5/7/9, namely, 1 foot locking anchor pipe 13 with the diameter of 42 mm is respectively arranged at two sides, the included angle between the foot locking anchor pipe 13 and the permanent primary support steel frame 5/7/9/is 45 ℃, the top of the permanent primary support steel frame is provided with an arch advanced support 14, the bottoms of the first unit area 1 and the second unit area 2 are transversely provided with temporary inverted arches 6/8, two ends of the temporary arches 6/8 are welded with the mesh sheet 5/7 of the primary support steel frame 5/7, the first unit area 1, the second unit area 3 and the fourth unit area 4 are provided with steel reinforcement walls.
The construction sequence of the primary support is as follows: and (3) initially spraying concrete with the thickness of 5cm in the excavated area, erecting a permanent primary support steel frame 5/7/9/10 and a temporary inverted arch steel frame 6/8, and re-spraying arch wall concrete 12 to the designed thickness after constructing a foot locking anchor pipe 13 and a system anchor rod.
The utility model provides a construction method of a tunnel primary support steel frame structure, which comprises the following steps:
(1) Excavating a first unit area 1, constructing a permanent primary support steel frame 5 and a foot locking anchor pipe 13 in time, and determining whether to erect a temporary inverted arch steel frame 6 according to monitoring measurement data;
(2) After the first unit area 1 is lagged by 3-5 m, a second unit area 2 is excavated; and constructing the permanent primary support steel frame 7 and the foot locking anchor pipes 13 in time. Constructing temporary inverted arch steel frames 8, wherein each steel frame support corresponds to the primary support, the steel frames are connected with each other by channel steel at intervals of 1.5m, and the rest parts are connected with phi 22 steel bars (with intervals of 0.5 m);
(3) After the second unit area 2 is lagged 15-20 m, a third unit area 3 is excavated; constructing a permanent primary support steel frame 9 and a foot locking anchor pipe 13 in time;
(4) The third unit area 3 is lagged by 5-10 m, and then a fourth unit area 4 is excavated in a segmented mode; constructing a permanent primary support steel frame 10 in time;
(5) The temporary inverted arch steel frames 8 are removed from each truss according to the construction progress of the permanent primary support steel frames 10, and a water-proof and drainage system is constructed from bottom to top;
(6) Filling the bottom plate concrete 11 according to the divided sections, and paying attention to reserved waterproof facilities such as buried type back-attached water stops;
(7) A self-propelled secondary lining trolley is adopted to pour arch wall secondary lining concrete 15 once.
For the longitudinal connection of the permanent primary support steel frames, adjacent steel frames at the arch springing positions of 5/7/9/of the permanent primary support steel frames are connected with longitudinal connection steel plates 16, as shown in fig. 3, and the rest parts are still connected by phi 22 screw steel bars (high-strength bolts).
The permanent primary support steel frame and the temporary inverted arch steel frame both adopt I22 b steel frame, the primary support I20 b steel frame is reinforced into I22 b steel frame, and the support strength is obviously improved under the condition of less weight and cost increase.
The tunnel primary support steel frame structure provided by the utility model can timely implement the sealing and looping of the support steel frame, and a stable support system is formed as early as possible, so that the problems of large deformation, serious settlement, collapse, roof collapse, deformation of the support system and the like caused by poor self-stabilization capability of surrounding rocks after excavation are avoided, and the post-treatment cost is reduced; the primary support deformation can be effectively controlled, the construction progress is improved, and the continuity and safety of construction are ensured.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (6)
1. The tunnel primary support steel frame structure is characterized by comprising a first unit area, a second unit area, a third unit area and a fourth unit area which are sequentially excavated along the longitudinal direction of a tunnel, wherein the bottom surfaces of the first unit area, the second unit area, the third unit area and the fourth unit area are connected to form a downward step shape, permanent primary support steel frames are arranged at the top and two sides of the first unit area, the second unit area and the third unit area, permanent primary support steel frames are arranged at the top, two sides and the bottom of the fourth unit area, foot locking anchor pipes are arranged at steel frame nodes of the permanent primary support steel frames, arch advanced supports are arranged at the top of the permanent primary support steel frames, temporary arch steel frames are transversely arranged at the bottom of the second unit area, two ends of each temporary arch steel frame are connected with the permanent primary support steel frames, steel frame sections of each permanent primary support steel frame are connected by high-strength bolts, and longitudinal connection steel plates are connected to adjacent arch positions of the permanent primary support steel frames; and arch wall concrete is sprayed on the inner sides of the permanent primary support steel frames in the first unit area, the second unit area, the third unit area and the fourth unit area, bottom plate concrete is poured on the inner sides of the permanent primary support steel frames at the bottom in the fourth unit area, and arch wall secondary lining concrete is poured on the inner sides of the arch walls in the fourth unit area.
2. The tunnel preliminary bracing steel frame structure according to claim 1, wherein the steel frame sections of the temporary inverted arch steel frames are connected by channel steel in pairs.
3. The tunnel preliminary bracing steel frame structure according to claim 1, wherein the bottom of the first unit area is laterally provided with a temporary inverted arch steel frame.
4. The tunnel primary support steel frame structure according to claim 1, wherein the included angle between the foot locking anchor pipe and the permanent primary support steel frame is 45 °.
5. The tunnel preliminary bracing steel frame structure according to claim 1, wherein arch parts and side walls of the first, second, third and fourth unit areas are provided with reinforcing mesh sheets.
6. The tunnel primary support steel frame structure according to claim 1, wherein the permanent primary support steel frame and the temporary inverted arch steel frame are both i 22b steel frames.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321969621.1U CN220909725U (en) | 2023-07-25 | 2023-07-25 | Tunnel preliminary bracing steel frame construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321969621.1U CN220909725U (en) | 2023-07-25 | 2023-07-25 | Tunnel preliminary bracing steel frame construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220909725U true CN220909725U (en) | 2024-05-07 |
Family
ID=90905239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321969621.1U Active CN220909725U (en) | 2023-07-25 | 2023-07-25 | Tunnel preliminary bracing steel frame construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220909725U (en) |
-
2023
- 2023-07-25 CN CN202321969621.1U patent/CN220909725U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103321659B (en) | Large-diameter tube curtain support underground excavation construction super-shallow burying large-section subway station structure and construction method | |
| CN108612110B (en) | Combined type supporting construction method for deep foundation pit of subway station | |
| CN102410031B (en) | Underground space structure constructed by pile wall construction method | |
| CN111365017B (en) | Construction method of underground intercommunication tunnel | |
| CN112814686A (en) | Construction method for transverse expanding excavation conversion when tunnel section suddenly changes into large-span section | |
| CN111910534A (en) | D-shaped temporary beam line reinforcing method and structure under complex geological condition | |
| CN112727501B (en) | Temporary supporting structure of transverse passage and construction method of transverse passage | |
| CN109630162A (en) | A method of it is quickly connect based on the heavy-duty steel of advance support with pipe curtain | |
| CN115467690B (en) | New structure system of shallow-buried large-span underground excavation subway station and construction method thereof | |
| CN220909725U (en) | Tunnel preliminary bracing steel frame construction | |
| CN218439399U (en) | Auxiliary supporting device for tunnel inverted arch construction | |
| CN112664205B (en) | Tunnel excavation supporting method for cross intersection | |
| CN212003200U (en) | A expand and dig structure for shield tunnel foundation is last | |
| CN111411968B (en) | Expanding excavation structure for shield tunnel foundation and construction method thereof | |
| CN213684135U (en) | Tunnel pavement longitudinal crack reinforcing and processing structure | |
| CN213086592U (en) | D-shaped temporary beam line reinforcing structure under complex geological condition | |
| CN212202065U (en) | Tunnel structure suitable for composite stratum with upper soft layer and lower hard layer | |
| CN114837700A (en) | Three-step arch beam type support construction method used in tunnel | |
| CN112901213A (en) | Underground roof construction method based on pipe curtain support | |
| CN113279787A (en) | Construction method for building pipe curtain supporting structure of ultra-shallow buried large-section underground excavation subway station | |
| CN110331980A (en) | A kind of shallow embedding fine sand layer tunnel Varied section transition and conversion construction method | |
| CN114960751B (en) | Method for attaching open excavation construction of subway station and then covering excavation and top-down construction of subway station | |
| CN117967323B (en) | Reinforcing ring structure at hydraulic tunnel fork-to-branch hole interface and roof-picking construction method | |
| CN114086992B (en) | Large-span tunnel expanding and excavating construction method under complex geological conditions | |
| CN221322423U (en) | Tunnel supporting structure for two-wire cross construction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |