Covered beam support system for irregular-shaped station enclosure

Abstract

The utility model relates to the technical field of deep foundation pit engineering construction, concretely relates to a special-shaped station enclosure structure cover plate beam support system, which comprises: an underground continuous wall arranged along the periphery of a to-be-built foundation pit; a vertical support system arranged vertically in the to-be-built foundation pit and used for supporting the load of the upper structure; a horizontal inner support system arranged horizontally and connected with the vertical support system and the underground continuous wall respectively and used for resisting the lateral earth pressure; and a cover plate arranged on the top of the vertical support system and the horizontal inner support system and rigidly connected with the top of the crown beam of the underground continuous wall. The utility model is connected with the underground continuous wall, the vertical support system, the horizontal inner support system and the cover plate, and works cooperatively to form a spatial stable structure, which can strengthen the control ability of the lateral deformation of the foundation pit, better resist the lateral earth pressure and solve the problem of organization difficulty caused by the narrow construction area and the lack of construction access.

Description

Technical Field

[0001] This utility model relates to the field of deep foundation pit engineering construction technology, and in particular to a support system for the cover plate beam of an irregularly shaped station enclosure structure. Background Technology

[0002] With the continuous development of urban underground space, the construction of deep foundation pit projects under complex environmental conditions is increasing. Deformation control during the foundation pit excavation process is directly related to the safety of the project itself and the surrounding environment. Especially when there are important buildings or structures nearby or the construction site is limited, higher requirements are placed on the foundation pit support system.

[0003] The foundation pit project for a certain railway station is characterized by its large excavation depth, wide width, complex surrounding environment, and limited construction area, presenting significant construction constraints: the edge of the pit facing the building (structure) is irregularly arranged, with some areas bulging outwards, and its proximity to the land acquisition boundary line makes it impossible to arrange construction access roads, affecting construction efficiency; at the same time, in these locations, the soil pressure distribution on the foundation pit support structure is uneven, with obvious stress concentration, which easily leads to large lateral deformations, increasing the difficulty of controlling the overall deformation of the foundation pit. While conventional foundation pit deformation control measures, such as increasing the stiffness of the support piles (walls), increasing the number of internal supports, or using conventional prestressed supports, have some effect, they are insufficiently adaptable to such harsh environmental and geological conditions: in the irregularly shaped, protruding, and weak areas of the foundation pit, it is difficult to arrange traditional straight bracing or corner bracing, making it difficult to form a uniform and effective constraint system.

[0004] Therefore, there is an urgent need to design a construction design scheme for foundation pit retaining support that can be applied to such complex environments, narrow sites and irregularly shaped foundation pits, especially for foundation pit deformation control when there are protruding weak points at the edge of the foundation pit. Utility Model Content

[0005] The purpose of this utility model is to provide a support system for the cover beam of an irregularly shaped station enclosure structure, so as to solve the problem of deformation control in the weak convex area of ​​an irregularly contoured foundation pit, and overcome the difficulties in construction organization caused by the small construction space and lack of construction access road.

[0006] This utility model provides a support system for the cover plate beam of an irregularly shaped station enclosure structure, including: Diaphragm walls are installed around the perimeter of the foundation pit to be constructed. The vertical support system is located within the foundation pit and is set up vertically to support the load of the superstructure. The horizontal internal support system is set horizontally and is connected to the vertical support system and the underground continuous wall respectively, in order to resist the surrounding external earth pressure; And a cover plate, which is disposed on top of the vertical support system and the horizontal internal support system, and the edge of the cover plate is rigidly connected to the top cap beam of the underground continuous wall.

[0007] Preferably, the vertical support system includes a number of column piles installed inside the foundation pit to be constructed, the column piles being arranged in rows at intervals along the length of the foundation pit to be constructed; the horizontal internal support system includes a number of first horizontal supports and a number of connecting beams, the first horizontal supports being arranged transversely along the foundation pit to be constructed, the first horizontal supports being transversely connected to all the column piles in the row and the corresponding side of the underground continuous wall in sequence, the connecting beams being longitudinally connected to the front and rear column piles of adjacent rows, or longitudinally connected to the column piles and the underground continuous wall.

[0008] Preferably, the first horizontal support and the connecting beam are both located at the top of the vertical support system and are on the same plane.

[0009] Preferably, in the convex area of ​​the foundation pit to be constructed, the connecting beams are arranged at an angle and multiple connecting beams are arranged in a straight continuous manner. The connecting beams arranged in a straight continuous manner are connected to the underground continuous wall by corner bracing and counter-bracing respectively.

[0010] Preferably, the side of the cover plate away from the diaphragm wall is arranged in a zigzag or straight line shape, and the bottom of the side of the cover plate away from the diaphragm wall is provided with a connecting beam with the same orientation, so as to achieve better support.

[0011] Preferably, the first horizontal support is a reinforced concrete structure integrally connected to the top of the column pile.

[0012] Preferably, the upper structure of the column pile adopts a lattice column form.

[0013] Preferably, the lower structure of the column pile is an anti-tension pile, and its top is provided with a pre-embedded connector for connecting with the upper column structure.

[0014] Preferably, the cover plate has a pre-drilled working hole, and a concrete retaining wall is provided around the working hole. The working hole can be used for earthwork excavation, material transportation and hoisting, and the surrounding concrete retaining wall can prevent surface water from flowing into the foundation pit, while also providing safety protection for the edge of the hole.

[0015] Preferably, multiple jet grouting piles are provided at the corners of the diaphragm wall. The jet grouting piles are located on the side of the diaphragm wall away from the foundation pit to be built, which can significantly enhance the waterproofing effect of the weak waterproofing parts at the corners of the diaphragm wall.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a cover plate beam support system for an irregularly shaped station enclosure structure. Through the interconnection of underground continuous walls, vertical support systems, horizontal internal support systems, and cover plates, they work together to form a spatially stable structure. This enhances the ability to control lateral deformation of the foundation pit, better resisting lateral earth pressure. At the same time, by using the cover plate as a construction platform, it solves the problem of organizational difficulties caused by narrow construction areas and lack of construction access roads, reduces adverse impacts on the surrounding environment, and ensures the safety of adjacent buildings. Attached Figure Description

[0017] Figure 1 This is a plan layout diagram of a foundation pit to be constructed in the prior art; Figure 2 This is a schematic diagram of the plan layout of a cover plate beam support system for an irregularly shaped station enclosure structure in one embodiment; Figure 3 This is a schematic diagram of the elevation structure of the cover beam support system of an irregularly shaped station enclosure at a certain cross section.

[0018] Markings in the diagram: 1-Diaphragm wall; 2-Column pile; 3-First horizontal support; 4-Connecting beam; 5-Cover plate; 6-Jet grouting pile. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0020] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0022] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0023] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0024] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0025] Example A certain station is designed as a three-level underground station with a double-column, three-span island platform. It is 347m long, with an excavation depth of approximately 24.85m. The standard section of the station's foundation pit is 23.5m wide, with some areas extending outwards to a width of 40.5 meters. Figure 1 As shown, controlling the deformation of the foundation pit is difficult. To address this, this embodiment provides a support system for the cover beam of an irregularly shaped station enclosure structure, such as... Figure 2 , Figure 3As shown, the structure includes a diaphragm wall 1, a vertical support system, a horizontal internal support system, and a cover plate 5. The diaphragm wall 1 is installed around the perimeter of the main body of the excavation pit, with a thickness of 1000mm (1200mm in some areas). The vertical support system is located vertically within the excavation pit and is used to support the load of the superstructure. The horizontal internal support system is horizontally installed and connects to both the vertical support system and the diaphragm wall 1, resisting external earth pressure and maintaining the stability of the pit's sidewalls. The cover plate 5 is used to fill irregular edge areas of the excavation pit. The cover plate 5 is located on top of the vertical support system and the horizontal internal support system, and its edge is rigidly connected to the top capping beam of the diaphragm wall 1. The filling location and size of the cover plate 5, as well as the specific arrangement and location of the vertical support system and the horizontal internal support system, can be determined according to the actual working conditions. The cover plate serves as a construction platform, connecting to construction access roads in the surrounding area for convenient transportation.

[0026] The diaphragm wall 1 is a continuous, seamless reinforced concrete wall cast in the foundation around the excavation pit. Its immense rigidity and strength directly resist the earth pressure outside the pit, preventing soil collapse and providing a stable, vertical slope for excavation. The diaphragm wall 1 also effectively blocks the seepage of groundwater from outside the pit, minimizing interference with the surrounding environment (buildings, pipelines, roads). Compared to other support methods such as piles or sheet piles, the diaphragm wall 1 effectively limits the deformation (horizontal displacement) of the retaining structure during excavation and the resulting surface settlement. Construction of the diaphragm wall 1 (using trenching machines, etc.) typically only involves work within the designated area, requiring relatively less space outside the pit and making it well-suited for narrow construction areas where access roads cannot be provided. By vertically installing a vertical support system within the excavation pit and horizontally installing an inner horizontal support system on top of it, the inner horizontal support system connects to the vertical support system and the diaphragm wall 1 at the top of the pit, forming a three-dimensional support network system. This provides stable support for laying the cover plate 5 and strengthens the control of lateral deformation of the pit, thus better resisting lateral earth pressure. The inner horizontal support system is supported at the bottom by the vertical support system, which reduces the bending deformation and end shear force of the inner horizontal support system, making it easier to erect. By installing the cover plate 5 at the top of the pit, supported by the bottom vertical support system and the inner horizontal support system, and rigidly connecting the edge of the cover plate 5 to the top cap beam of the diaphragm wall 1, the displacement of the top of the diaphragm wall 1 at the weakest protruding locations can be limited. Furthermore, the cover plate 5 can serve as a construction platform, solving the problem of organizational difficulties caused by narrow construction areas and the lack of access roads.

[0027] Generally, the vertical support system includes column piles 2 and tension piles. Column piles 2 are used to bear pressure and transfer the upper support system and construction load to the deep stable soil. The upper structure of column piles 2 is often a lattice column, and the lower structure is usually a bored cast-in-place pile. Although tension piles also have the ability to bear vertical pressure, they are usually not the primary consideration in the design. They are mainly used to bear tension and resist upward pull. The reinforcement of the pile body is usually configured according to the tension. The reinforcement cage is usually arranged along the entire length and anchored into the foundation slab for a sufficient length to ensure the effective transfer of tension.

[0028] In this embodiment, the tension piles also serve as column piles 2, and are installed below the bottom slab of the foundation pit. The top of the tension piles has a pre-embedded connector for connection to the upper column structure. The upper main structure of the column piles 2 adopts a lattice column, with the bottom end of the lattice column fixedly connected to the tension piles via the pre-embedded connector. The top end of the lattice column passes upward through the cover plate 5 and is fixedly connected thereto. The column piles 2 are arranged in rows at intervals along the length of the foundation pit to be constructed, facilitating lateral bracing of the foundation pit. Using tension piles as column piles 2, compared to separately installing conventional column piles 2 and tension piles, reduces the number of piles, saves materials and labor time, optimizes the internal spatial layout of the foundation pit, and avoids the cost and trouble of additional processing (such as removal) required after the foundation pit is backfilled, as column piles 2 specifically designed for temporary support would become "waste piles."

[0029] In one or more embodiments, the horizontal internal support system includes several first horizontal supports 3 and several connecting beams 4. The first horizontal supports 3 are arranged transversely along the foundation pit and sequentially connect all the rows of column piles 2 and the corresponding underground diaphragm walls 1. The connecting beams 4 connect two adjacent rows of column piles 2 longitudinally, or connect the column piles 2 and the underground diaphragm walls 1 longitudinally. The two adjacent column piles 2 connected by the connecting beams 4 can be aligned or staggered.

[0030] In this embodiment, the first horizontal support 3 and the connecting beam 4 are both located at the top of the vertical support system and preferably on the same plane. The first horizontal support 3 and the connecting beam 4 are connected to form a planar grid structure, intersecting with the vertical support system at multiple points. As the foundation pit is excavated, a second, third, fourth, and fifth horizontal support can be further installed from top to bottom. Waist beams can be installed at different positions on the inner wall of the foundation pit, which are hinged or fixed to the corresponding horizontal supports.

[0031] In an optional embodiment, the first horizontal support 3 can be configured as a reinforced concrete structure integrally connected to the top of the column pile 2, and the connecting beam 4 can be a steel beam or a concrete structure.

[0032] In this embodiment, in the convex area of ​​the foundation pit to be constructed, the connecting beams 4 are preferably arranged at an angle, and multiple connecting beams 4 are arranged continuously in a straight line. These continuously arranged connecting beams 4 are connected to the diaphragm wall 1 via corner bracing and counter-bracing methods. According to the on-site construction requirements, a certain area of ​​cover plate 5 is laid in the weak convex area of ​​the foundation pit (at a location with a foundation pit width of 40.5 meters) and on the opposite side laterally. The side of the cover plate 5 away from the diaphragm wall 1 can be arranged in a zigzag or straight line shape, and the bottom of the side of the cover plate 5 away from the diaphragm wall 1 is supported by connecting beams 4 arranged in the same direction. Through the coordinated work of the lattice columns and cover plates 5, the cover plates 5 and the diaphragm wall 1, the first horizontal support 3, and the connecting beams 4, a spatially stable structure is formed, which can enhance the deformation control capability of the weak convex area and control the foundation pit deformation within the millimeter range. In this embodiment, the cover plate 5 can be 40cm thick.

[0033] In cases where there are no suitable conditions for constructing a temporary access road around the foundation pit, the deformation of the foundation pit at the connecting line can be controlled by adding a cover plate 5, thus ensuring the structural safety of the foundation pit. Adding a cover plate 5 at the connecting line can create an 8m wide temporary access road on the side of the building (structure), providing a work area for earthwork excavation, support erection, and hoisting of structural construction materials in this area, thereby overcoming the difficulties in construction organization caused by the small construction space and lack of a temporary access road.

[0034] Although the construction of cover plate 5 increased the construction period of cover plate 5 and lattice column, the addition of cover plate 5 increased the working area for earthwork excavation and structural construction, which improved construction efficiency. Overall, it is more beneficial to save construction time.

[0035] In an optional embodiment, the cover plate 5 has pre-drilled working holes for earthwork excavation, material transportation and hoisting.

[0036] In an optional implementation, a concrete retaining wall is preferably installed circumferentially along the working hole to prevent surface water from flowing into the foundation pit and to provide safety protection for the edge of the hole.

[0037] In an optional embodiment, multiple jet grouting piles 6 are provided at the corners of the diaphragm wall 1. The jet grouting piles 6 are located on the side of the diaphragm wall 1 away from the foundation pit to be constructed, and are used to enhance the deformation control capability at the inner corner. In this embodiment, the jet grouting piles 6 are provided with a diameter of 800mm and a depth that penetrates through the silt layer and extends into the underlying clay layer by no less than 1m.

[0038] The aforementioned cap-beam support system for the irregularly shaped station enclosure structure effectively suppresses lateral deformation and surface settlement during the excavation of the foundation pit, especially on the side adjacent to important buildings, ensuring the stability of the foundation pit itself and minimizing adverse impacts on the surrounding environment, thus protecting the safety of adjacent buildings. This enclosure structure exhibits good adaptability in complex environments, confined spaces, and irregularly shaped foundation pits.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A support system for the cover plate beam of an irregularly shaped station enclosure structure, characterized in that, include: A diaphragm wall (1) is set up around the perimeter of the foundation pit to be built; The vertical support system is located within the foundation pit and is set up vertically to support the load of the superstructure. The horizontal internal support system is set horizontally and is connected to the vertical support system and the underground continuous wall (1) respectively, to resist the surrounding external earth pressure; And a cover plate (5), which is located on top of the vertical support system and the horizontal inner support system, and the edge of the cover plate (5) is rigidly connected to the top cap beam of the underground continuous wall (1).

2. The irregular-shaped station enclosure structure cover beam support system according to claim 1, characterized in that, The vertical support system includes several column piles (2) set inside the foundation pit to be built. The column piles (2) are arranged in rows at intervals along the length of the foundation pit to be built. The horizontal internal support system includes several first horizontal supports (3) and several connecting beams (4). The first horizontal supports (3) are set in the transverse direction along the foundation pit to be built. The first horizontal supports (3) connect all the column piles (2) in the row and the underground continuous wall (1) on the corresponding side in the transverse direction. The connecting beams (4) connect the two column piles (2) in the adjacent row in the longitudinal direction, or connect the column piles (2) and the underground continuous wall (1) in the longitudinal direction.

3. The irregular-shaped station enclosure structure cover beam support system according to claim 2, characterized in that, The first horizontal support (3) and the connecting beam (4) are both located at the top of the vertical support system and are on the same plane.

4. The irregular-shaped station enclosure structure cover beam support system according to claim 2, characterized in that, In the convex area of ​​the foundation pit to be constructed, the connecting beams (4) are arranged at an angle and multiple connecting beams (4) are arranged in a straight line and continuously, so that the underground continuous wall (1) is connected by corner bracing and counter bracing respectively.

5. The irregular-shaped station enclosure structure cover beam support system according to claim 4, characterized in that, The cover plate (5) is arranged in a zigzag or straight line shape on the side away from the underground continuous wall (1), and the bottom of the cover plate (5) on the side away from the underground continuous wall (1) is provided with the connecting beam (4) arranged in the same direction.

6. The irregular-shaped station enclosure structure cover beam support system according to claim 2, characterized in that, The first horizontal support (3) is a reinforced concrete structure integrally connected to the top of the column pile (2).

7. The irregular-shaped station enclosure structure cover beam support system according to claim 2, characterized in that, The upper structure of the column pile (2) adopts the form of a lattice column.

8. The irregular-shaped station enclosure structure cover beam support system according to claim 2, characterized in that, The lower part of the column pile (2) is an anti-uplift pile, and its top is provided with a pre-embedded connector.

9. The irregular-shaped station enclosure structure cover beam support system according to any one of claims 1-8, characterized in that, The cover plate (5) has a pre-reserved working hole, and a concrete retaining wall is provided around the working hole.

10. The irregular-shaped station enclosure structure cover beam support system according to any one of claims 1-8, characterized in that, Multiple jet grouting piles (6) are provided at the corner of the underground continuous wall (1), and the jet grouting piles (6) are located on the side of the underground continuous wall (1) away from the foundation pit to be built.

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