A drainage limiting device suitable for preventing the floating of a metro section track slab

Abstract

The utility model provides a kind of water discharge limit and discharge device suitable for preventing subway section track slab floating, including ram structure foundation, bottom plate assembly, two water holes, two water pipes, one flow valve and one pressure check valve;Two The water holes are opened at the drainage ditch ram structure foundation near subway section track slab, and the depth of the water hole reaches tunnel primary support surface at least;Two water pipes are installed in two water holes based on the bottom plate assembly respectively, and the bottom plate assembly is used to lock water pipe on ram structure foundation;The flow valve is installed on the upper end of one water pipe, and the outlet end of the flow valve is connected with drain pipe;The pressure check valve is installed on the upper end of another water pipe, for opening when pressure overrun, and the outlet of the pressure check valve is connected with outside.The device solves the problem of track slab floating by the way of temporary water hole+permanent water hole.

Description

Technical Field

[0001] This utility model relates to the field of subway tunnel construction technology, specifically to a drainage and limiting device suitable for preventing the track slab of a subway section from floating. Background Technology

[0002] In the process of urban water supply and drainage construction and underground space engineering development, when situations such as tunnel water seepage or track slab floating occur during subway construction, in order to ensure that there is no large-scale shutdown in the operating section, a bellows-type emergency treatment measure is generally adopted, which at the same time ensures the normal operation of the subway in a local area and minimizes the losses.

[0003] The main reason for subway uplift is the abundance of groundwater, or during periods of heavy rainfall, when groundwater surges and causes local uplift. Once uplift occurs, groundwater can easily form a water pressure channel.

[0004] Specifically, the length of subway tunnel sections is generally around 2km. Due to groundwater erosion, buoyancy, and the effects of vibrations from the operation of rail vehicles and geological structures, especially the large centripetal force in the turning sections, the long-term effects can cause structural damage and deformation to the bottom slab and track slab. When encountering groundwater, the track slab is prone to floating.

[0005] How to solve the problem of track plate floating is a practical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a drainage and limiting device suitable for preventing track slabs from floating in subway sections. This device combines temporary drainage holes and permanent drainage holes to address the problem of track slab floating.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a drainage and limiting device for preventing the floating of subway track slabs, comprising a rammed structure foundation, a base plate assembly, two water inlet holes, two water inlet pipes, a flow limiting valve and a pressure check valve;

[0008] The two water inlet holes are located at the foundation of the drainage ditch near the track slab of the subway section, and the depth of the water inlet holes reaches at least the initial support surface of the tunnel.

[0009] Two water inlet pipes are respectively installed in two water inlet holes based on the base plate assembly, and the base plate assembly is used to lock the water inlet pipes on the rammed structure foundation;

[0010] The flow limiting valve is installed at the upper end of one of the water inlet pipes, and the outlet end of the flow limiting valve is connected to the drain pipe;

[0011] The pressure check valve is installed at the upper end of another water inlet pipe and is used to open when the pressure exceeds the limit. The outlet of the pressure check valve is open to the outside.

[0012] Preferably, the base plate assembly includes a rubber pad laid on the ramming structure foundation and a steel plate laid on the rubber pad. The steel plate has bolt mounting holes and is fixed to the ramming structure foundation by bolts.

[0013] Preferably, the diameter of the drain pipe is DN40.

[0014] Preferably, the upper end of the water inlet pipe used to install the flow limiting valve is connected to the flow limiting valve via a reducing pipe joint.

[0015] Preferably, the spring of the flow limiting valve has a preset equivalent fluid pressure ≥ 0.15 MPa.

[0016] Preferably, the reducing pipe fitting is a DN40 to DN20 reducing pipe fitting.

[0017] Preferably, the opening pressure of the pressure check valve is the same as the spring preset equivalent fluid pressure of the flow limiting valve.

[0018] Preferably, the outlet end of the pressure check valve is connected to a drainage ditch.

[0019] Preferably, the depth of the water inlet hole is ≥680mm.

[0020] Preferably, the depth of the water inlet hole exceeds the depth of the initial support surface of the tunnel by ≥100mm.

[0021] This utility model has substantial features and advancements compared to existing technologies. Specifically, in areas where subway tunnel slabs are prone to floating, this utility model sets up two drainage mechanisms. One set forms a permanent drainage channel through water inlet holes, water inlet pipes, flow-limiting valves, and pipelines for draining water during daily water accumulation. The other set forms a temporary drainage channel through water inlet holes, water inlet pipes, and pressure check valves for temporary drainage during emergency situations. The two sets work together to achieve a combination of permanent and temporary drainage, ensuring the orderly discharge of water in the subway tunnel section and preventing the track slabs from floating. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of a drainage and limiting device for preventing the floating of track slabs in subway sections, which is part of this utility model.

[0023] In the diagram: 1. Rammed earth foundation; 2. Water inlet hole; 3. Water inlet pipe; 4. Flow control valve; 5. Pressure check valve; 6. Rubber pad; 7. Steel plate; 8. Bolt; 9. Reducing pipe joint. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0025] like Figure 1 As shown, a drainage and limiting device for preventing the floating of track slabs in subway sections includes a rammed foundation 1, a base plate assembly, two water inlet holes 2, two water inlet pipes 3, a flow limiting valve 4, and a pressure check valve 5.

[0026] Among them, the rammed structure foundation 1 is the rammed structure foundation of the drainage ditch near the subway section track slab, which is a concrete pouring structure. The two water inlet holes 2 are opened at the rammed structure foundation of the drainage ditch near the subway section track slab. The depth of the water inlet holes is at least to the initial support surface of the tunnel. In this embodiment, the depth is set to exceed the initial support surface of the tunnel, ≥680mm, and at least 100mm beyond the initial support surface of the tunnel.

[0027] Two water inlet pipes 3 are respectively installed in two water inlet holes 2 based on the base plate assembly. The base plate assembly is used to lock the water inlet pipes 3 on the rammed foundation 1. Specifically, the base plate assembly includes a rubber pad 6 laid on the rammed foundation 1 and a steel plate 7 laid on the rubber pad 6. The steel plate 7 has bolt mounting holes and is fixed to the rammed foundation 1 by bolts 8.

[0028] The flow limiting valve 4 is installed on the upper end of one of the water inlet pipes 3, and the outlet end of the flow limiting valve 4 is connected to the drain pipe, which can lead the water to the main drainage channel of the tunnel.

[0029] The pressure check valve 5 is installed on the upper end of another water inlet pipe 3 and is used to open when the pressure exceeds the limit. The outlet of the pressure check valve is connected to the outside, that is, the space near the current track plate, preferably to the drainage ditch.

[0030] The drain pipe 3 has a diameter of DN40. The upper end of the water inlet pipe used to install the flow limiting valve 4 is connected to the flow limiting valve 4 through a reducing pipe joint 9, which is a DN40 to DN20 joint.

[0031] Regarding the pressure settings, the spring preset equivalent fluid pressure of the flow limiting valve 4 is ≥0.15MPa, and the opening pressure of the pressure check valve 5 is the same as the spring preset equivalent fluid pressure of the flow limiting valve 4.

[0032] Working principle explanation:

[0033] Because water accumulation is always likely to occur near the track slab of the subway section in the tunnel, the area under the tunnel slab is pressurized due to the accumulation of seepage water. Under normal circumstances, the water volume is relatively stable, and a small amount of water can be continuously and stably discharged outward through the flow limiting valve 4 to prevent the water volume from becoming too large and causing the tunnel slab to float. Since the water volume is not large and water pressure is required for drainage, the pressure limiting valve and pipe diameter need to be designed to be relatively small so that the water can be discharged outward through the pressure difference.

[0034] When the nearby structure is severely damaged or water surges, the water pressure increases sharply. If the flow limit valve 4 is not set to a sufficient flow rate or the pressure exceeds the limit, the flow limit valve 4 will be automatically closed immediately. At the same time, the pressure check valve will be opened when the pressure setting value is exceeded. A large amount of water will be discharged from the relatively thicker side of the pressure check valve. The discharged water will enter the drainage ditch or be directly discharged to the outer surface of the tunnel to form surface water, preventing the track slab from being lifted.

[0035] After the water surge ends, some of the surface water is drained away through the drain outlet, while the rest seeps down and, after the pressure decreases, is drained away stably through the channel where the flow-limiting valve 4 is located.

[0036] The design of the two drainage channels is complementary. The flow-limiting valve 4 is used for long-term stable drainage, while the pressure check valve is used for temporary drainage, effectively preventing the track slab from floating.

[0037] Finally, it should be noted that: the preferred embodiments of this patent have been described in detail above, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A drainage and limiting device for preventing the floating of track slabs in subway sections, characterized in that: This includes a rammed earth foundation, a base plate assembly, two water inlets, two water pipes, a flow limiting valve, and a pressure check valve; The two water inlet holes are located at the foundation of the drainage ditch near the track slab of the subway section, and the depth of the water inlet holes reaches at least the initial support surface of the tunnel. Two water inlet pipes are respectively installed in two water inlet holes based on the base plate assembly, and the base plate assembly is used to lock the water inlet pipes on the rammed structure foundation; The flow limiting valve is installed at the upper end of one of the water inlet pipes, and the outlet end of the flow limiting valve is connected to the drain pipe; The pressure check valve is installed at the upper end of another water inlet pipe and is used to open when the pressure exceeds the limit. The outlet of the pressure check valve is open to the outside.

2. The drainage and limiting device for preventing the floating of subway track slabs according to claim 1, characterized in that: The base plate assembly includes a rubber pad laid on the ramming structure foundation and a steel plate laid on the rubber pad. The steel plate has bolt mounting holes and is fixed to the ramming structure foundation by bolts.

3. The drainage and limiting device for preventing the floating of subway track slabs according to claim 2, characterized in that: The drainage pipe has a diameter of DN40.

4. The drainage and limiting device for preventing the floating of subway track slabs according to claim 3, characterized in that: The upper end of the water inlet pipe used to install the flow limiting valve is connected to the flow limiting valve via a reducing pipe joint.

5. The drainage and limiting device for preventing the floating of subway track slabs according to claim 4, characterized in that: The spring of the flow limiting valve has a preset equivalent fluid pressure ≥0.15MPa.

6. The drainage and limiting device for preventing the floating of subway track slabs according to claim 5, characterized in that: The reducing pipe fitting is a DN40 to DN20 fitting.

7. The drainage and limiting device for preventing the floating of subway track slabs according to claim 5, characterized in that: The opening pressure of the pressure check valve is the same as the spring preset equivalent fluid pressure of the flow limiting valve.

8. The drainage and limiting device for preventing the floating of subway track slabs according to claim 7, characterized in that: The outlet end of the pressure check valve is connected to a drainage ditch.

9. The drainage and limiting device for preventing the floating of subway track slabs according to claim 8, characterized in that: The depth of the water inlet hole is ≥680mm.

10. The drainage and limiting device for preventing the floating of subway track slabs according to claim 9, characterized in that: The depth of the water intake hole exceeds the initial support surface of the tunnel by ≥100mm.

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