Electric power tunnel foundation pit supporting structure connected with existing pipe gallery
By adopting a combined structure of support piles, capping beams, internal supports, crossbeams, and temporary columns during the construction of the power tunnel, the problems of protecting the surrounding environment, providing safe working space, and ensuring the stability of the foundation pit were solved, and stable support and safe connection to the existing pipe gallery were achieved.
Patent Information
- Application Number
- CN202520010611.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-01-03
AI Technical Summary
During the construction of new urban power tunnels, it is crucial to effectively protect the surrounding environment, provide safe working space, and offer stable support for existing utility tunnels, especially under conditions of limited excavation, to ensure the stability and safety of the foundation pit.
A combined structure of support piles, capping beams, internal bracing, crossbeams, and temporary columns is adopted. A stable support system is formed through concrete or steel supports. Combined with cast-in-place piles and water-stop curtains, the stability and safety of the foundation pit are ensured.
It has achieved the protection of the surrounding environment, provided a safe working space, and provided a stable connection and support for the existing pipe gallery, ensuring the stability and safety of the foundation pit.
Smart Images
Figure CN223660852U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of support structure technology, specifically relating to a support structure for a power tunnel foundation pit connected to an existing utility gallery. Background Technology
[0002] Urban power tunnels are generally linear structures with a certain burial depth located underground. Depending on their use, their width is generally about 4 to 10 meters and their depth is generally about 8 to 10 meters. Considering the planned capacity and phased construction, power tunnels or other integrated tunnel projects are often built in the reserved locations of existing tunnels to meet the needs of urban development.
[0003] Power utility tunnels or integrated utility tunnels are located near urban roads, surrounded by numerous buildings and structures, making excavation difficult. Therefore, the foundation pit support for newly constructed power tunnels connecting to the utility tunnels is particularly important in order to protect the surrounding environment, provide safe working space, and connect to existing utility tunnels. Utility Model Content
[0004] The purpose of this utility model is to provide a power tunnel foundation pit support structure that connects to existing utility tunnels, which can protect the surrounding environment, provide safe working space in the newly built utility tunnel, and provide stable support and working space for connecting to existing tunnels.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A power tunnel foundation pit support structure connecting to an existing utility tunnel includes support piles arranged around the new utility tunnel and adjacent to the existing utility tunnel, a capping beam connecting the top of the support piles, and an inner support for supporting the support piles. The support piles are provided with a utility tunnel interface hole at the interface position of the existing utility tunnel, and a crossbeam is provided above the interface hole.
[0007] A further improvement of this utility model is that the size of the pipe gallery interface hole is the same as the cross-sectional size of the existing pipe gallery, and a temporary column is provided below the crossbeam for the pipe gallery interface hole.
[0008] A further improvement of this utility model is that the capping beam and the support are made of concrete or steel. The capping beam and the inner support are set in two layers, and the soil at the existing pipe gallery is supported by the joint constraint of the top and bottom supports.
[0009] A further improvement of this utility model is that: transverse main bars and stirrups are set at the position of the crossbeam, and the crossbeam is cast to form the upper support structure supporting the crossbeam.
[0010] A further improvement of this utility model is that the temporary column is made of steel lattice column angle steel or I-beam, which is used to balance the bending moment and internal force of the beam when the lateral opening range is wide.
[0011] A further improvement of this utility model is that the support piles around the newly built pipe gallery can be cast-in-place piles or sheet piles, and a water-stop curtain is set around the support piles.
[0012] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:
[0013] This application discloses a power tunnel foundation pit support structure for connecting to existing utility tunnels, which can effectively protect the surrounding environment, provide safe working space, and connect to existing utility tunnels. This application ensures foundation pit stability through support piles, capping beams, and internal bracing. The crossbeams and temporary columns installed at the openings provide stable support for connecting to the existing tunnel and provide working space. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of a power tunnel foundation pit support structure for connecting an existing utility tunnel according to this utility model.
[0015] Figure 2 yes Figure 1 Sectional view of AA;
[0016] Figure 3 yes Figure 1 BB cross-sectional view;
[0017] Among them, 1. support piles, 2. internal supports, 3. crossbeams, 4. temporary columns, and 5. main reinforcement bars of support piles. Detailed Implementation
[0018] The present invention will be further described in detail below with reference to embodiments:
[0019] like Figure 1 , 2 As shown in Figure 3, a power tunnel foundation pit support structure connecting an existing utility tunnel includes support piles 1 installed around the perimeter of the existing utility tunnel and the proposed new utility tunnel. A capping beam is installed on the support piles 1 to connect them, forming a stable support system. Simultaneously, an internal brace 2 is installed within the support piles 1 to enhance their stability and bearing capacity. A utility tunnel interface hole is provided on the support piles 1 at the interface location of the existing utility tunnel, and a crossbeam 3 is installed above the interface hole. Specifically, before breaking the support piles 1, a reinforced concrete crossbeam 3 is poured to support the upper support structure. Before constructing the crossbeam 3, the concrete of the corresponding support piles needs to be chiseled. When breaking the support piles, the main reinforcing bars 5 of the support piles are retained. At the same time, transverse main reinforcing bars and stirrups are installed at the crossbeam location. After the crossbeam has reached sufficient strength, it supports the upper support structure. After the crossbeam is poured, the piles at the opening are broken.
[0020] The size of the pipe gallery interface opening is the same as the cross-sectional size of the existing pipe gallery. When the width of the pipe gallery interface opening is large, a temporary column 4 is set below the crossbeam 3 to ensure its stability. It can be removed later. Steel lattice column angle steel or I-beam can be used. When the range of the horizontal opening is wide, it is used to balance the bending moment and internal force of the crossbeam 3.
[0021] The capping beam and internal support 2 adopt concrete support or steel support. The capping beam and internal support 2 are set in 2 layers. The top and bottom supports jointly support the soil at the existing pipe gallery, ensuring the overall stability and safety of the support pile structure.
[0022] The outer support pile 1 can adopt support structures such as cast-in-place piles and steel sheet piles. If the groundwater level is shallow, a water-stop curtain can be set around the support pile to seal the groundwater.
[0023] The power tunnel foundation pit support structure of this application, which connects to the existing utility tunnel, can effectively protect the surrounding environment and provide a safe working space for connecting to the existing utility tunnel.
Claims
1. A power tunnel foundation pit support structure connecting to an existing utility corridor, characterized in that: It includes support piles (1) set around the new pipe gallery and adjacent to the existing pipe gallery, a cap beam connecting the top of the support piles (1) and an inner support (2) supporting the support piles (1). The support piles (1) are provided with pipe gallery interface holes at the existing pipe gallery interface positions, and a crossbeam (3) is provided above the pipe gallery interface holes.
2. The power tunnel foundation pit support structure for connecting existing utility tunnels according to claim 1, characterized in that: The size of the pipe gallery interface hole is the same as the cross-sectional size of the existing pipe gallery, and a temporary column (4) is set below the crossbeam (3) of the pipe gallery interface hole.
3. The power tunnel foundation pit support structure for connecting existing utility tunnels according to claim 1, characterized in that: The cap beam and the support (2) are made of concrete or steel, and the cap beam and the inner support (2) are set in two layers.
4. The power tunnel foundation pit support structure for connecting existing utility tunnels according to claim 1, characterized in that: Transverse main reinforcement bars and stirrups are installed at the position of the beam, and the beam is formed by casting.
5. The power tunnel foundation pit support structure for connecting existing utility tunnels according to claim 2, characterized in that: The temporary column (4) is made of steel lattice column angle steel or I-beam.
6. The power tunnel foundation pit support structure for connecting existing utility tunnels according to claim 1, characterized in that: The support piles (1) can be cast-in-place piles or sheet piles, and a water-stop curtain is set around the support piles (1).