Pile box reinforced rib underground composite structure and its construction method

Abstract

The present invention relates to a pile-box ribbed underground composite structure and a construction method thereof. When existing open-cut box-type tunnel structures bear super-large loads from the upper portion, there are problems such as large forces on the tunnel structure, uneven internal stress distribution, poor integrity, large structural deformation, large settlement, and poor safety. This structure includes a box-type structure and long and short piles; the box-type structure includes a top plate, side walls, and a bottom plate, the top plate is provided with a top plate longitudinal beam, the bottom plate is provided with a bottom plate longitudinal beam, and the top plate, side walls, and bottom plate are provided with transverse ring beams; the top plate longitudinal beams, the bottom plate longitudinal beams, and the transverse ring beams constitute ribbed longitudinal and transverse hidden beams; the long and short piles are located below the box-type structure and support the box-type structure. The present invention adds a combined structure of ribbed longitudinal and transverse hidden beams and long and short piles at the bottom to the box-type structure of the tunnel, with a small amount of engineering work, a clear force system, and significantly improved structural rigidity and stability, reduced structural deformation and settlement, and improved structural safety.

Description

Technical Field

[0001] The present invention relates to the technical field of open-cut tunnel engineering construction, and in particular to a pile box ribbed underground combined structure and a construction method thereof. Background Art

[0002] With the increasing number of large-scale transportation hubs, the engineering practice of complex co-configured underground structures has also gradually increased. The situation where tunnels and upper super-large structural transfer systems are subjected to joint forces is also increasing. This type of structural system is prone to uneven stress on the tunnel. If it is located in soft soil and water-rich strata, it is more likely to cause large settlement and deformation of the structure.

[0003] Unlike conventional open-cut box-type tunnel structures, when located in soft soil and water-rich strata and bearing super-large loads from above, the tunnel structure is subjected to large forces and the internal stress distribution is uneven. The current existing open-cut box-type tunnel structure is difficult to withstand the super-large loads from above, resulting in large structural deformation and settlement. Therefore, it is necessary to design a construction structure that can solve the above technical problems for the box-type open-cut tunnel structure that can withstand super-large loads from above. Summary of the Invention

[0004] The purpose of the present invention is to provide a pile box and ribbed underground composite structure and its construction method to solve the problems of existing open-cut box tunnel structures, such as large stress on the tunnel structure, uneven internal stress distribution, poor integrity, large structural deformation, large settlement and poor safety when bearing super-large upper loads.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A pile-box ribbed underground composite structure comprising a box structure and long and short piles;

[0007] The box-type structure includes a top plate, side walls and a bottom plate, wherein the top plate is provided with a top plate longitudinal beam, the bottom plate is provided with a bottom plate longitudinal beam, and the top plate, the side walls and the bottom plate are provided with a transverse ring beam; the top plate longitudinal beam, the bottom plate longitudinal beam and the transverse ring beam constitute ribbed longitudinal and transverse hidden beams;

[0008] The long and short piles are located under the box structure and support the box structure.

[0009] Furthermore, the top plate longitudinal beams and the bottom plate longitudinal beams correspond to each other up and down, and a vertical middle partition wall is provided between the top plate longitudinal beams and the bottom plate longitudinal beams.

[0010] Furthermore, a top plate corner longitudinal beam is provided at the node between the top plate and the side wall.

[0011] Furthermore, bottom plate corner longitudinal beams are provided at the nodes between the bottom plate and the side walls.

[0012] Furthermore, the bottom surface of the transverse ring beam between the top plate corner longitudinal beam and the adjacent top plate longitudinal beam is arched;

[0013] The bottom surface of the transverse ring beam between two transversely adjacent top plate longitudinal beams is arched.

[0014] Furthermore, an upper structure conversion beam is provided above the box-type structure, an upper structure support is provided at the bottom of the upper structure conversion beam, and the upper structure support is supported on the top of the top plate longitudinal beam.

[0015] Furthermore, upper structure pile foundations are provided on both lateral sides of the box-type structure, and upper structure foundation caps are provided on the tops of the upper structure pile foundations;

[0016] Upper structure supports are provided at the bottom of both ends of the horizontal line of the upper structure conversion beam, and the upper structure supports at both ends are supported on the top of the upper structure foundation pedestal.

[0017] Furthermore, the upper structure support and the upper structure conversion beam are an integrally cast structure.

[0018] Furthermore, the long and short piles below the box-type structure are arranged symmetrically in length.

[0019] In another aspect, a construction method for the pile box and ribbed underground composite structure is provided, the method comprising:

[0020] Construct the open excavation foundation pit support structure, simultaneously construct long and short piles, and reserve connecting steel bars at the top of the long and short piles;

[0021] Excavate the foundation pit layer by layer down to the bottom elevation of the box structure, expose the connection steel bars reserved on the top of the long and short piles, and carry out the waterproofing and cushion construction of the bottom plate;

[0022] Tie the bottom plate reinforcement of the box structure, reliably anchor the bottom plate reinforcement and the connection reinforcement reserved on the top of the long and short piles, and set hidden beam reinforcement at the ribbed longitudinal and transverse hidden beams. Set up the formwork and pour concrete to form a combined structure of the ribbed longitudinal and transverse hidden beams and the bottom plate.

[0023] The side wall reinforcement and top plate reinforcement of the box structure are arranged in layers and sections, and hidden beam reinforcement is set at the ribbed longitudinal and transverse hidden beams, and concrete is poured to form a pile box ribbed composite structure together with the combined structure of the ribbed longitudinal and transverse hidden beams and the bottom plate.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The structure of this invention incorporates a combination of reinforced longitudinal and transverse hidden beams and long and short piles at the bottom of the tunnel's box-type structure. This reduces the engineering effort, provides a clear force system, and significantly enhances structural rigidity and stability, reducing deformation and settlement, thereby improving structural safety. Furthermore, the long and short piles provide sufficient support for the box structure, improving overall tunnel settlement and uneven deformation in soft soil and water-rich strata, and enhancing the overall safety of the structure.

[0026] During the structural construction process of the present invention, the plate thickness of the box-type structure can be reduced by arranging ribbed longitudinal and transverse hidden beams, thereby reducing the structural engineering workload and improving the structural integrity, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0028] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0029] Figure 2 It is a structural diagram of embodiment 2 of the present invention.

[0030] The symbols in the figure are:

[0031] 1-superstructure crossbeam, 2-superstructure column, 3-superstructure transfer beam, 4-superstructure support, 5-superstructure foundation pedestal, 6-superstructure pile foundation, 7-transverse ring beam, 8-top plate longitudinal beam, 9-middle partition wall, 10-top plate corner longitudinal beam, 11-bottom plate corner longitudinal beam, 12-bottom plate longitudinal beam, 13-long and short piles. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0033] In the description of this patent, it should be understood that the terms "up", "down", "left", "right", "vertical", "horizontal", "longitudinal", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this patent.

[0034] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "disposed" should be understood broadly. For example, they can refer to fixed connection or disposition, detachable connection or disposition, or integral connection or disposition. Those skilled in the art will understand the specific meanings of the above terms in this patent based on the specific circumstances.

[0035] In a specific embodiment, the line direction is defined as the longitudinal direction, and the direction perpendicular to the line direction is defined as the transverse direction.

[0036] like Figure 1 The present invention provides a pile box and ribbed underground composite structure, which is an underground space structure capable of bearing super-large upper loads, consisting of a box structure, ribbed longitudinal and transverse hidden beams, and long and short piles. Specifically, the structure includes a box structure and long and short piles 13.

[0037] The box-type structure consists of a roof, side walls, and a floor, with a rectangular cross-section. The roof is equipped with roof longitudinal beams 8, the floor is equipped with floor longitudinal beams 12, and the roof, side walls, and floor are equipped with a full ring of transverse ring beams 7. Roof corner longitudinal beams 10 are installed at the nodes between the roof and side walls, and floor corner longitudinal beams 11 are installed at the nodes between the floor and side walls. All the longitudinal beams and transverse ring beams 7 form a ribbed longitudinal and transverse concealed beam.

[0038] The top plate longitudinal beams 8 and bottom plate longitudinal beams 12 correspond vertically, with a vertical partition wall 9 interposed between them. This provides support and serves to separate laterally adjacent track and platform spaces. The bottom surfaces of the transverse ring beams 7 between the top plate corner longitudinal beams 10 and adjacent top plate longitudinal beams 8 are arched, as are the bottom surfaces of the transverse ring beams 7 between two laterally adjacent top plate longitudinal beams 8. This creates a vaulted structure at the top of each track and platform space, effectively improving its bearing capacity.

[0039] The long and short piles 13 are located below the box structure and support the box structure. The steel bars in the long and short piles 13 are tied together with the steel bars at the bottom of the box structure. Figure 1 and Figure 2The long and short piles 13 below the box-type structure are arranged symmetrically in length. Of course, the length and position of the long and short piles 13 can be further adjusted and changed according to the lateral width of the box-type structure and the specific stratum characteristics.

[0040] Figure 1 This is the structural form of structural embodiment 1, in which five longitudinal channels are designed. Figure 2 This is the structural form of structural embodiment 2, in which seven longitudinal channels are designed.

[0041] The box structure has ribbed longitudinal and transverse hidden beams and long and short piles, which can withstand the super-large load on the upper part. The upper structure transfer beam 3 is set above the box structure, and the upper structure support 4 is set at the bottom of the upper structure transfer beam 3. The upper structure support 4 is supported on the top of the top plate longitudinal beam 8. In addition, the ends of the upper structure transfer beam 3 at both ends can also be supported by other pile foundations, such as Figure 1 , upper structure pile foundations 6 are provided on both lateral sides of the box structure, upper structure foundation pedestals 5 are provided on the top of the upper structure pile foundations 6, upper structure supports 4 are provided at the bottom of both ends of the horizontal line of the upper structure conversion beam 3, and the upper structure supports 4 at both lateral ends are supported on the top of the upper structure foundation pedestals 5. Therefore, the upper super-large load is borne by a multi-part structure, the middle part is a box structure with long and short piles 13 and ribbed longitudinal and transverse hidden beams, and the two ends are upper structure pile foundations 6 and upper structure foundation pedestals 5. The upper structure supports 4 and the upper structure conversion beam 3 can be an integral cast structure, and the upper structure supports 4 are protrusions on the bottom surface of the upper structure conversion beam 3, or can be set as a split structure.

[0042] The construction method of the pile box ribbed underground composite structure comprises the following steps:

[0043] S1: Construct an open excavation support structure from the ground level to support the pit after excavation and during construction of the box structure. Simultaneously construct long and short piles 13, reserving connecting steel bars at the tops of the piles.

[0044] S2: Excavate the foundation pit layer by layer from the ground to the bottom elevation of the box structure, expose the connection steel bars reserved on the top of the long and short piles 13, and carry out waterproofing and cushion construction of the bottom plate.

[0045] S3: Tie the bottom plate reinforcement of the box structure, reliably anchor the bottom plate reinforcement and the connection reinforcement reserved on the top of the long and short piles 13, and set hidden beam reinforcement at the ribbed longitudinal and transverse hidden beams, and pour concrete in the formwork to form a combined structure of the ribbed longitudinal and transverse hidden beams and the bottom plate.

[0046] S4: Arrange the side wall reinforcement and top plate reinforcement of the box structure in layers and sections, set hidden beam reinforcement at the ribbed longitudinal and transverse hidden beams, and pour concrete to form a pile box ribbed composite structure together with the combined structure of the ribbed longitudinal and transverse hidden beams and the bottom plate.

[0047] S5: Build the waterproof layer and protective layer on the top slab. Then, build the superstructure support 4 on the protective layer. Simultaneously, build the superstructure foundation pedestal 5 and the superstructure pile foundation 6. Alternatively, pre-reinforced steel bars are reserved for the top slab. The steel bars of the superstructure support 4 are connected to the reserved steel bars. Simultaneously, build the superstructure foundation pedestal 5 and the superstructure pile foundation 6.

[0048] S6: On the upper structure support 4, the upper structure foundation pedestal 5 and the upper structure pile foundation 6, the upper structure cross beam 1, the upper structure column 2 and the upper structure transfer beam 3 are constructed to form an upper transfer structure.

[0049] The present invention's box-type structure, reinforced longitudinal and transverse concealed beams, and long and short piles form a box structure designed to withstand excessive upper loads. This effectively prevents problems such as uneven stress distribution, low rigidity, poor integrity, large structural deformation, large settlement, and poor safety when the box structure bears excessive upper loads. This structure ensures stable internal forces and deformations when bearing excessive upper loads, making it particularly suitable for the design of open-cut box tunnels subjected to excessive upper loads.

[0050] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art can make several simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. Pile box and ribbed underground composite structure, characterized by: The structure includes a box structure and long and short piles (13); The box-type structure comprises a top plate, side walls and a bottom plate, the top plate being provided with a top plate longitudinal beam (8), the bottom plate being provided with a bottom plate longitudinal beam (12), and the top plate, the side walls and the bottom plate being provided with a transverse ring beam (7); the top plate longitudinal beam (8), the bottom plate longitudinal beam (12) and the transverse ring beam (7) forming ribbed longitudinal and transverse hidden beams; The long and short piles (13) are located below the box structure and support the box structure.

2. The pile box ribbed underground composite structure according to claim 1, characterized in that: The top plate longitudinal beam (8) and the bottom plate longitudinal beam (12) correspond to each other vertically, and a vertical middle partition wall (9) is provided between the top plate longitudinal beam (8) and the bottom plate longitudinal beam (12).

3. The pile box ribbed underground composite structure according to claim 2, characterized in that: A top plate corner longitudinal beam (10) is provided at a node between the top plate and the side wall.

4. The pile box ribbed underground composite structure according to claim 3, characterized in that: Bottom plate corner longitudinal beams (11) are provided at the nodes between the bottom plate and the side walls.

5. The pile box ribbed underground composite structure according to claim 4, characterized in that: The bottom surface of the transverse ring beam (7) between the top plate corner longitudinal beam (10) and the adjacent top plate longitudinal beam (8) is arched; The bottom surface of the transverse ring beam (7) between two transversely adjacent top plate longitudinal beams (8) is arched.

6. The pile box ribbed underground composite structure according to claim 5, characterized in that: An upper structure conversion beam (3) is provided above the box-type structure, an upper structure support (4) is provided at the bottom of the upper structure conversion beam (3), and the upper structure support (4) is supported on the top of the top plate longitudinal beam (8).

7. The pile box ribbed underground composite structure according to claim 6, characterized in that: Upper structure pile foundations (6) are provided on both lateral sides of the box-type structure, and upper structure foundation bearing platforms (5) are provided on the tops of the upper structure pile foundations (6); Upper structure supports (4) are provided at the bottom of both ends of the horizontal line of the upper structure conversion beam (3), and the upper structure supports (4) at both ends of the horizontal line are supported on the top of the upper structure foundation pedestal (5).

8. The pile box ribbed underground composite structure according to claim 7, characterized in that: The upper structure support (4) and the upper structure conversion beam (3) are an integral cast structure.

9. The pile box ribbed underground composite structure according to claim 8, characterized in that: The long and short piles (13) below the box-type structure are arranged symmetrically in length.

10. The construction method of the pile box and ribbed underground composite structure according to claim 1, characterized in that: The method comprises: Constructing an open excavation foundation pit support structure, simultaneously constructing long and short piles (13), and reserving connecting steel bars on the tops of the long and short piles (13); Excavate the foundation pit layer by layer downward to the bottom elevation of the box structure, expose the connection steel bars reserved on the top of the long and short piles (13), and carry out waterproofing and cushion construction of the bottom plate; The bottom plate reinforcement of the box structure is tied, the bottom plate reinforcement and the connection reinforcement reserved on the top of the long and short piles (13) are reliably anchored, and hidden beam reinforcement is set at the ribbed longitudinal and transverse hidden beams, and concrete is poured in the formwork to form a combined structure of the ribbed longitudinal and transverse hidden beams and the bottom plate; The side wall reinforcement and top plate reinforcement of the box structure are arranged in layers and sections, and hidden beam reinforcement is set at the ribbed longitudinal and transverse hidden beams, and concrete is poured to form a pile box ribbed composite structure together with the combined structure of the ribbed longitudinal and transverse hidden beams and the bottom plate.

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