CN212337306U - Automatic device that overflows of pressure-bearing water at bottom of tunnel - Google Patents

Abstract

The utility model relates to an automatic overflow arrangement of confined water at bottom of tunnel, the device install at the bottom of the tunnel on the inverted arch preliminary bracing steelframe, including drainage shaft, a plurality of arch face upward bottom drainage blind pipe, central ditch and drain pipe, drainage shaft is located at the bottom of the tunnel inverted arch preliminary bracing steelframe both ends and with arch face upward bottom drainage blind pipe connection, arch face upward bottom drainage blind pipe is radial distribution, and its radiation central point puts the mouth of pipe of department and passes through the central ditch of leg joint, central ditch and drain pipe connection. The utility model discloses can reduce the maintenance of high-speed railway long and large tunnel operation period invert bottom drain pipe check valve and change the frequency, can reduce the long and large tunnel of high-speed railway and pass through rich water section invert infiltration, gush the water risk simultaneously, prolong the long and large tunnel of high-speed railway and pass through the life of rich water section invert lining cutting.

Description

Automatic device that overflows of pressure-bearing water at bottom of tunnel

Technical Field

The utility model relates to a tunnel engineering field especially relates to an automatic overflow arrangement of confined water at bottom of tunnel.

Background

At present, the confined water at the bottom of the tunnel does not have an effective dredging mode in the railway tunnel construction process, and the confined water at the bottom of the tunnel of a water-rich tunnel or a tunnel with large burial depth and the confined water at the bottom of a lining inverted arch can not be effectively dredged easily, so that the confined water of a tunnel deformation joint and a construction joint of a water-rich section overflows or a base plate bulges during the operation of a high-speed railway, and the operation safety of the high-speed railway is influenced.

In the prior art, a drain pipe with a one-way valve is generally arranged at the position of a central rectangular ditch 5m of a tunnel and connected with the bottom of the tunnel to drain confined water. As shown in fig. 1

Because geological conditions of the tunnel passing through the mountain are complex and changeable, if the tunnel passes through a mountain water-rich area, after tunnel lining construction is completed, the back of a lining waterproof and drainage system and the bottom of an inverted arch tunnel are closed into a ring due to the lining waterproof and drainage system, and confined water is easily formed outside the lining waterproof and drainage system and the bottom of the tunnel; if the confined water can not be effectively dredged in time, tunnel invert or bottom plate are current because of high speed, high frequency at high-speed railway operation in-process, invert settlement joint, movement joint disturbance are frequent, construction joint, movement joint position confined water overflow easily appear, the electric railway operation in-process is to infiltration in the hole, gush water the requirement strict, the operation in-process invert lining maintenance degree of difficulty is big, influences railway tunnel invert, invert filling life.

The confined water of the whole tunnel drainage system is collected in the central ditch, the water quality condition is unstable, suspended particles are easy to appear in the water, the ditch runs water all the year round, suspended matters in the water are precipitated to the position of a valve clack of a one-way valve through the pipe orifice of the one-way valve, the valve clack is easy to block, the confined water at the bottom of the inverted arch is not smoothly drained, and the service life of the one-way valve is influenced. And the difficulty of replacing the check valve is higher during the operation.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides an automatic overflow arrangement of confined water at the bottom of the tunnel in time dredges confined water at the bottom of the tunnel, prevents that the inverted arch from shortening life because of the confined water at the bottom of the tunnel.

The technical scheme of the utility model a device is spilled over automatically to confined water at bottom of tunnel is installed on the preliminary bracing steelframe of inverted arch at the bottom of the tunnel, include:

the drainage well is positioned at two ends of an inverted arch primary support steel frame at the bottom of the tunnel and is connected with the inverted arch bottom drainage blind pipe, the inverted arch bottom drainage blind pipes are distributed radially, the pipe orifice at the radial center position of the inverted arch primary support steel frame is connected with the central water ditch through a support, and the central water ditch is connected with a drainage pipe.

Furthermore, the arch-shaped inverted bottom drainage blind pipe is arranged at the bottom of the inverted arch primary support steel frame, and a pipe orifice close to the central ditch is bent upwards and is flush with the primary support surface of the inverted arch primary support steel frame.

Furthermore, a waterproof plate is arranged at an opening at one end of the arched bottom drainage blind pipe, which is far away from the central ditch.

Furthermore, the arch bottom drainage blind pipe is a single-wall perforated corrugated pipe, and openings at two ends and the outer surface of the single-wall perforated corrugated pipe are wrapped with non-woven fabrics.

Further, the length of the drainage well is 80cm, the width of the drainage well is 80cm, and the depth of the drainage well is 50 cm.

Furthermore, the drain pipe is provided with a one-way valve, a filter screen is arranged at the pipe orifice of the drain pipe in the circulation direction of the one-way valve, and a filter sponge is arranged in the filter screen.

Furthermore, the diameters of the drain pipe and the arched bottom drain blind pipe are 50 mm.

The technical scheme of the utility model among, through installing the drainage blind pipe with radial distribution, easily operation, it is great to open at the bottom of the tunnel and dig the face, and the confined water is gushed water some dispersion water pressure and is less, can concentrate the pump drainage with water in consequently the work progress. And meanwhile, the pressure-bearing water led out by the drainage blind pipe at the outer edge of the primary support at the bottom of the tunnel in the tunnel inverted arch lining construction process is not sealed at the end position of the primary support of the inverted arch, so that the pressure-bearing water is not high, the water can be pumped and drained in a centralized manner, and the tunnel inverted arch lining construction operation is facilitated.

Moreover, the pipe orifice of the inverted arch bottom drain pipe is provided with the filter screen device, so that the installation operation is simple and convenient, and the replacement is simple; can filter suspended matters in water to prolong the service life of the one-way valve and ensure the smooth discharge of the inverted arch bottom confined water.

Based on the technical scheme, the maintenance and replacement frequency of the inverted arch bottom drain pipe check valve during the operation of the long and large tunnel of the high-speed railway can be reduced, the risk of water seepage and water burst of the inverted arch of the long and large tunnel of the high-speed railway passing through the water-rich section can be reduced, and the service life of the inverted arch lining of the long and large tunnel of the high-speed railway passing through the water-rich section is prolonged.

Drawings

FIG. 1 is a schematic view of an inverted arch bottom drainage pipe arrangement in the prior art;

FIG. 2 is a schematic view of the installation plane structure of the middle arch inverted bottom drainage blind pipe of the present invention;

FIG. 3 is a schematic view of the installation section structure of the middle arch inverted bottom drainage blind pipe of the present invention;

FIG. 4 is a schematic structural view of the drain pipe of the present invention;

fig. 5 is a schematic structural view of the filter screen of the middle drainage pipe of the present invention.

In the figure: 1. a single wall perforated corrugated pipe; 2. a rubber waterstop; 3. a one-way valve; 4. an inverted arch primary support steel frame; 5. a water collecting well; 31. a filtering sponge is arranged in the stainless steel filtering net; 32. the inverted arch bottom drain pipe mouth.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

The utility model discloses an in the use, when the tunnel construction gets into rich water end, at first need accomplish the excavation at the bottom of the tunnel, the step of virtual sediment clearance and geology inspection is implemented again the utility model discloses.

The following describes the specific technical solution adopted by the present invention with reference to the accompanying drawings:

example 1

The embodiment of the utility model provides a pair of automatic overflow arrangement of pressure-bearing water at bottom of tunnel has laid the tunnel end invert primary frame in tunnel construction process, sets up 80cm long 80cm wide degree of depth 50 cm's sump pit at invert end position, and the drainage invert is ponding at the bottom of the tunnel and detect the tunnel end and do not have under-cut in the primary work progress of tunnel.

As shown in fig. 2, a pneumatic pick is used for chiseling a groove or a cutting machine is used for grooving at the installation position of the radial drainage blind pipe, the chiseling depth is not less than 10cm, and after the virtual slag in the groove is removed, the initial spraying concrete is constructed.

Burying drainage blind pipes in a radiation mode according to the figure 2, wherein the drainage blind pipes are single-wall perforated corrugated pipes (externally wrapped with non-woven fabrics) with the diameter of 50, and as shown in the figure 3, the burying number of the blind pipes can be properly increased or decreased according to the groundwater volume of an inverted arch construction section; the position, close to the radiation center, of the blind pipe is a central ditch, the position, close to the opening of the central ditch, of the blind pipe is fixed by a support, the pipe orifice of the blind pipe is ensured to extend out of the primary support surface of an inverted arch to be not less than 5cm, the blind pipe in the groove is fixed by rivets and pressing strips every 50cm, the pipe orifice is fixed firstly and then the blind pipe in the groove is fixed, and the blind pipe in the groove is prevented from being pulled in the fixing process of the blind pipe of the pipe orifice; after the drainage blind pipe is fixed, non-woven fabrics are wrapped at the pipe orifices at two ends, so that foreign matters are prevented from entering the pipe to influence the drainage effect of the blind pipe.

Then, after the drainage blind pipe is fixed, beginning the construction of spraying concrete at the bottom of the tunnel, paying attention to protect the drainage blind pipe at the bottom of the tunnel in the construction process, and after the construction of primary spraying concrete, bearing water at the bottom of the tunnel flows out from the pipe orifice of the blind pipe; before the lining cutting invert construction, clear away the invert and prop up the virtual sediment of internal surface for the first time, at the bottom of radial drainage blind pipe mouth of pipe and the tunnel at the bottom of the tunnel first support surface cut level, and cover the waterproof board at the blind pipe mouth, the waterproof board edge adopts and penetrates nail + hot melt packing ring fixed firm, the interval is not more than 30cm, the waterproof board covers the elasticity moderate degree, make the effective discharge of pressure-bearing hydroenergy at the bottom of the tunnel, and do not invade the invert lining cutting, and set up the confined water that the sump pit pump drainage spilled over at the invert front end, avoid the invert to prop up surface ponding for the first time, influence the invert lining concrete construction quality.

As shown in fig. 4, a drain pipe is installed on the central ditch, a check valve is arranged on the drain pipe, a control tee is taken during the installation of the drain pipe, the drain pipe is also a single-wall perforated corrugated pipe, and the joint of the connecting part needs to be firm and water-tight; the quality of the check valve is checked according to requirements after the check valve is installed, and the quality of each check valve is guaranteed to be qualified; the check valves are connected with the inverted arch bottom drain pipe through heat joint, the installation quality of each check valve is checked, and the installation quality of the check valves is guaranteed to meet the design requirements.

Installing a filter screen and a filter sponge at the opening of the drain pipe, wherein the diameter of the filter mesh is 5mm as shown in figure 5, and the filter mesh is manufactured uniformly according to the pipe diameter of the drain pipe; and (4) checking and accepting after entering the field to ensure that the size of each filter screen meets the requirement. The filter screen needs to be added after the installation of each inverted arch bottom drain pipe is completed, so that foreign matters cannot enter the pipe orifice, and the service function of the check valve is ensured. Therefore, the purpose of protecting the inverted arch bottom drain pipe and the check valve is achieved, the service life of the check valve is prolonged, the check valve overhauling and replacing frequency of the railway tunnel, particularly a long and large railway tunnel, is reduced, and the inverted arch bottom drain pipe and the check valve are economical to use and convenient to operate.

The utility model is buried every 8-12m in the construction process of the tunnel bottom.

The utility model discloses in other embodiments, still be applicable to other structures basement confined water treatment, handle etc. like deep basal pit cushion cap bottom confined water, culvert basis confined water.

The construction quality control difficulty of the bottom of the deep foundation pit is high in the cofferdam construction process, the bottom of the foundation pit is provided with the confined water seepage and the water burst point after the foundation pit is excavated, the confined water drainage at the bottom of the pit can be made before the construction of a deep foundation pit bearing platform in the same mode, the concentrated drainage at the position of a water collecting well is realized, the confined water drainage is stopped after the strength of the concrete pouring of the bearing platform is met, the incompact structure in the bearing platform pouring process caused by the confined water of the foundation can be effectively prevented, the water seepage point occurs in the structure, and the quality defect occurs.

When the tunnel construction gets into the rich water district, make the automatic overflow of the bottom pressure-bearing water of tunnel through the mode that increases "radial" drainage blind pipe at the bottom of the tunnel, can control drainage blind pipe quantity simultaneously, arrange the central ditch through the pipe drainage at the bottom of the inverted arch with the bottom of the tunnel pressure-bearing to extension tunnel inverted arch life.

Through the mode of increasing the stainless steel filter screen at the drain pipe mouth of pipe at the inverted arch bottom, can prevent that debris and suspended particles from getting into the drain pipe in the central ditch to extension drain pipe check valve life reduces the check valve and changes the frequency, thereby improves inverted arch life.

Claims (7)

1. The utility model provides an automatic overflow arrangement of pressure-bearing water at bottom of tunnel, the device install at the bottom of the tunnel on the inverted arch preliminary bracing steelframe, a serial communication port, automatic overflow arrangement of pressure-bearing water at the bottom of the tunnel includes drainage shaft, a plurality of arch at the bottom of drainage blind pipe, central ditch and drain pipe, drainage shaft is located at the bottom of the tunnel inverted arch preliminary bracing steelframe both ends and with arch at the bottom of drainage blind pipe connection, arch at the bottom of drainage blind pipe is radial distribution, its radiation central point puts the mouth of pipe of department and passes through the central ditch of leg joint, central ditch and drain pipe connection.

2. The automatic overflow device of the tunnel bottom confined water of claim 1, wherein the inverted arch bottom drainage blind pipe is installed at the bottom of the inverted arch primary support steel frame, and the pipe orifice near the central ditch is bent upward and flush with the primary support surface of the inverted arch primary support steel frame.

3. The automatic overflow device of the confined water at the bottom of the tunnel according to claim 2, wherein a waterproof plate is arranged at an opening of the drainage blind pipe at the bottom of the arch far away from the central ditch.

4. The automatic overflow device of confined water at the bottom of a tunnel according to claim 3, wherein the raised bottom drainage blind pipe is a single-wall perforated corrugated pipe, and the openings at both ends and the outer surface of the corrugated pipe are wrapped with non-woven fabrics.

5. The automatic overflow device of the pressure-bearing water at the bottom of the tunnel of claim 4, wherein the drainage well is 80cm long, 80cm wide and 50cm deep.

6. The automatic overflow device of the pressure-bearing water at the bottom of the tunnel according to claim 1, wherein the drain pipe is provided with a one-way valve, a filter screen is arranged at the pipe orifice of the drain pipe in the flowing direction of the one-way valve, and a filter sponge is arranged in the filter screen.

7. The automatic overflow device of the confined water at the bottom of the tunnel of claim 6, wherein the diameter of the drain pipe and the arched bottom drain blind pipe is 50 mm.

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