Subway station half cover excavation construction structure
By using a composite support system that alternates between concrete and steel supports with cover plates and bored piles during subway station construction, the problems of low construction safety and efficiency in subway station construction have been solved, achieving a balance between construction and traffic and reducing costs.
Patent Information
- Application Number
- CN202423293411.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-30
AI Technical Summary
When constructing subway stations in complex urban environments, traditional cut-and-cover methods suffer from poor construction safety, low construction efficiency, high costs, and significant impact on the surrounding environment, especially when constructing near main urban roads and residential areas.
The structure adopts a layout where the upper part of the foundation pit is covered with a slab and the other side is an open-cut area. It combines bored piles as the retaining structure and alternately arranges concrete supports and steel supports to form a composite support system, ensuring construction safety and efficiency.
This approach achieved a balance between construction and traffic, shortened the construction period, reduced construction costs, minimized the impact on the surrounding environment, and ensured construction safety and quality.
Smart Images
Figure CN223853385U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to underground engineering construction technical field, concretely relates to a subway station half cover excavation construction structure. BACKGROUND
[0002] With the rapid development of urban rail transit construction, the intersection construction of subway station construction and complex environment such as urban trunk road and residential area is increasing. In the subway station construction under such complex environment, how to ensure construction safety and protect the normal operation of urban traffic and residents' life has become a key technical problem to be solved.
[0003] At present, subway station construction mainly adopts open cut method, cover excavation method and other construction methods. Among them, during the construction of the traditional open cut method, due to the large excavation range of foundation pit and high support requirement, it is easy to cause damage to adjacent buildings, and even cause serious consequences such as building cracking, tilting or collapse. At the same time, the construction site needs to be closed during the construction of open cut method, causing long-term traffic interruption, bringing great pressure to urban traffic and seriously affecting residents' daily travel.
[0004] In order to solve the problems existing in open cut method, construction units begin to use cover excavation method for construction. Cover excavation method can ensure normal traffic on the ground by setting cover plate on the ground. However, cover excavation method has high process requirement and great construction difficulty when used in soft soil layer construction. At the same time, due to the need for construction operation in limited space, the construction efficiency is low, the construction period is long, and the construction cost is high.
[0005] In addition, the existing construction method generally has problems such as complex construction process, poor integrity of main structure, great difficulty in waterproof construction, etc. Especially when construction near urban trunk road and residential area, due to limited site and sensitive surrounding environment, higher requirements are put forward for construction technology and construction organization. UTILITY MODEL CONTENT
[0006] The utility model aims at providing a subway station half cover excavation construction structure, which can shorten construction period, reduce construction cost and reduce the influence on surrounding environment under the premise of ensuring engineering quality and safety.
[0007] In order to achieve the above purpose, the utility model realizes the following technical scheme:
[0008] A subway station half cover excavation construction structure, comprising a foundation pit, a retaining structure and a support system, the upper part of the foundation pit is provided with a cover plate on one side, and the other side is an open cut area; the retaining structure adopts bored pile; the support system comprises concrete support and steel support, and the concrete support and steel support are arranged alternately.
[0009] Further, the bored pile has a diameter of 1000mm, a distance of 1200mm, and a depth of 25-29m.
[0010] Further, the support system comprises two concrete supports and two steel supports, and from top to bottom, the two concrete supports and the two steel supports are arranged in sequence as a first concrete support, a first steel support, a second concrete support, and a second steel support.
[0011] Further, the excavation depth of the foundation pit is 23-25m.
[0012] Further, the cover plate is arranged on the side of the foundation pit close to the urban trunk road.
[0013] Further, the top of the bored pile is provided with a corbel.
[0014] Further, the side wall of the foundation pit is provided with a shotcrete layer.
[0015] Further, the side wall of the foundation pit is further provided with an inclinometer.
[0016] Further, the open excavation area is provided with a construction platform.
[0017] Further, the foundation pit is provided with a waterproof concrete main structure.
[0018] Compared with the prior art, the utility model has the following beneficial effects:
[0019] 1. The utility model realizes the balance between construction and traffic by arranging the cover plate on one side of the upper part of the foundation pit and the open excavation area on the other side. The cover plate side can ensure the normal traffic of the urban trunk road, and the open excavation area can carry out normal construction operation, effectively solving the contradiction between engineering construction and urban traffic in the traditional construction method.
[0020] 2. The bored pile is used as the enclosure structure, and the support system of the alternately arranged concrete support and steel support is arranged, forming a complete composite support system. The support system has large rigidity and high bearing capacity, can effectively control the deformation of the foundation pit, ensures the construction safety, and reduces the influence on the surrounding buildings.
[0021] 3. The alternately arranged concrete support and steel support in the support system can not only meet the requirement of the deep foundation pit support, but also facilitate the segmented construction of the main structure. The concrete support can provide large rigidity, the steel support is convenient to remove, improves the construction efficiency, shortens the construction period, and reduces the construction cost. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a half-section schematic view of the half-cover excavation construction structure of the utility model;
[0023] Figure 2It is a top view schematic diagram of the half-cover excavation construction structure of the utility model;
[0024] In the drawing,
[0025] 1, foundation pit; 2, cover plate; 3, open excavation area; 4, concrete support; 5, steel support; 6, cast-in-situ pile; 7, crown beam; 8, sprayed concrete layer; 9, main road. DETAILED DESCRIPTION
[0026] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.
[0027] In the description of the utility model, it is necessary to explain that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0028] The half-cover excavation construction structure of the subway station under the complex urban environment provided by the utility model comprises a foundation pit 1, a retaining structure and a support system. The upper part of the foundation pit 1 is provided with a cover plate 2 on one side, and the other side is an open excavation area 3. The cover plate 2 is arranged on the side close to the main road 9 of the city, which is used to ensure the normal traffic of the ground. The open excavation area 3 is used for the transportation of construction machinery and materials, and a construction platform is arranged for construction operation.
[0029] The retaining structure adopts a cast-in-situ pile 6. In the embodiment, the pile diameter of the cast-in-situ pile 6 is 1000mm, the pile spacing is 1200mm, and the pile depth is 25-29m. A crown beam 7 is arranged at the top of the cast-in-situ pile 6, and the crown beam 7 adopts a reinforced concrete structure, which is used to connect and fix the cast-in-situ pile 6 and enhance the integrity of the retaining structure. The excavation depth of the foundation pit 1 is 23-25m, and a sprayed concrete layer 8 is arranged on the side wall of the foundation pit 1 to enhance the stability of the side wall of the foundation pit 1. At the same time, an inclinometer tube is also arranged on the side wall of the foundation pit 1, which is used to monitor the deformation of the side wall of the foundation pit 1 in real time.
[0030] The support system comprises concrete supports 4 and steel supports 5, which are arranged alternately. Specifically, the support system comprises two rows of concrete supports 4 and two rows of steel supports 5, which are sequentially arranged from top to bottom as the first row of concrete supports 4, the first row of steel supports 5, the second row of concrete supports 4 and the second row of steel supports 5. The concrete supports 4 are made of cast-in-situ reinforced concrete structure, which has large rigidity and bearing capacity. The steel supports 5 are made of profile steel, which is convenient for installation and removal, and is beneficial to improve the construction efficiency.
[0031] In the embodiment, the waterproof concrete main structure is arranged in the foundation pit 1. The main structure is made of waterproof concrete, which can effectively prevent underground water leakage. The main structure construction can be carried out under the cover plate 2 on one side of the foundation pit 1 and the open excavation area 3, which is beneficial to the development of segmented construction.
[0032] The embodiment takes the Tangjing station of the north extension section of the No. 8 subway line as an example for illustration. The station is a three-layer open (covered) excavation station, the platform adopts a 13m island platform, the total length of the station is 211.6 meters, the standard section width is 22.5 meters, and the excavation depth of the station foundation pit 1 is 23.6 meters. The enclosure structure adopts the bored pile 6 with a diameter of 1000mm and a spacing of 1200mm, and the pile depth is in the range of 25.95-28.96m. The foundation pit 1 is provided with two rows of concrete supports 4 and two rows of steel supports 5, and the supports are arranged alternately. In the construction process, the normal traffic of the Sanxianli Avenue is ensured through the setting of the cover plate 2, and at the same time, through the reasonable support system, the deformation of the foundation pit 1 is effectively controlled, and the construction safety and the stability of the surrounding buildings are ensured.
[0033] Through the adoption of the above technical scheme, the semi-covered excavation construction structure provided by the utility model not only ensures the normal operation of urban traffic, but also meets the needs of construction operation, and at the same time, through the scientific support system, the construction safety is ensured, and the utility model has good practicability.
[0034] The above embodiment is only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable those skilled in the art to understand the content of the utility model and implement it, and it cannot limit the protection scope of the utility model. Any equivalent transformation or modification according to the spirit and essence of the utility model should be covered in the protection scope of the utility model.
Claims
1. A subway station top-down construction structure comprising a foundation pit, a retaining structure and a support system, characterized in that: The upper side of the foundation pit is provided with a cover plate, and the other side is an open excavation area; the enclosure structure adopts bored piles, the support system comprises concrete supports and steel supports, and the concrete supports and the steel supports are arranged alternately.
2. A subway station semi-cover excavation construction structure according to claim 1, characterized in that: The pile diameter of the bored pile is 1000mm, the pile spacing is 1200mm, and the pile depth is 25-29m.
3. The subway station semi-cover excavation construction structure according to claim 1, characterized in that: The support system comprises two concrete supports and two steel supports, and from top to bottom, they are a first concrete support, a first steel support, a second concrete support and a second steel support.
4. The subway station semi-cover excavation construction structure according to claim 1, characterized in that: The excavation depth of the foundation pit is 23-25m.
5. The subway station semi-cover excavation construction structure according to claim 1, characterized in that: The cover plate is arranged on the side of the foundation pit close to the main urban road.
6. A subway station semi-cover excavation construction structure according to claim 1, characterized in that: The top of the bored pile is provided with a corbel.
7. A subway station semi-cover excavation construction structure according to claim 1, characterized in that: The sidewall of the foundation pit is provided with a shotcrete layer.
8. A subway station semi-cover excavation construction structure according to claim 1, characterized in that: The sidewall of the foundation pit is also provided with an inclinometer tube.
9. The subway station semi-cover excavation construction structure according to claim 1, characterized in that: The open excavation area is provided with a construction platform.
10. The subway station semi-cover excavation construction structure according to claim 1, characterized in that: The foundation pit is provided with a waterproof concrete main structure.