CN212452524U - External drainage device for buried pressure steel pipe - Google Patents

Abstract

The utility model provides a formula of burying pressure steel pipe outer drainage device, including pressure steel pipe, industry soap, annular channel-section steel, inlet tube, check valve, outlet pipe, the outer wall of the same cross section department of pressure steel pipe sets up round confined annular channel-section steel, and the cavity that annular channel-section steel and pressure steel pipe outer wall formed is as the water catch bowl, and it is fixed that annular channel-section steel and pressure steel pipe outer wall adopt spot welding, and the gap of the no welding seam department between annular channel-section steel and the pressure steel pipe uses industry soap to clog, and the bottom of annular channel-section steel links to each other with the inlet tube, and the inlet tube passes through the check valve and links to each other with the outlet pipe. The utility model does not need extra excavation of the drainage gallery, and the tunnel excavation size is small during installation, thus saving investment; in addition, the whole device has short drainage distance, easy flow control and simple structure, can effectively reduce the external water pressure of the pressure steel pipe, and is suitable for the buried pressure steel pipe with large buried depth and external pressure higher than internal pressure.

Description

External drainage device for buried pressure steel pipe

Technical Field

The utility model relates to a hydraulic and hydroelectric engineering field specifically is a water installation outside formula penstock buries.

Background

The buried pressure steel pipe is a steel pipe which is buried in a rock body and concrete is backfilled between the steel pipe and surrounding rocks. The external water pressure of the penstock has two sources, namely the underground water pressure of a mountain body and the water pressure acted on the penstock by the external seepage of the water in the reinforced concrete lining at the upper part of the penstock. Under the same condition, the internal pressure resistance of the steel pipe is higher than the external pressure resistance, and the steel pipe is easy to generate instability under the action of external pressure, so that the drainage and depressurization design is required in consideration of economic rationality.

The existing main measures for draining and depressurizing comprise: (1) arranging a drainage gallery at the upper part of the pressure steel pipe, embedding radial drainage pipes around the cross section of the drainage gallery to form a drainage net, and collecting external water around the steel pipe in the drainage gallery along the drainage pipes for drainage; (2) the steel pipe outer wall adopts the hoop channel-section steel that catchments, sets up the drain pipe that is on a parallel with the steel pipe axis and leads the water in the channel-section steel to the factory building in and discharge, (3) steel pipe outer wall parcel composite drainage board, outer water is along the drainage board and discharge.

However, the existing designs have the following drawbacks: the method (1) needs additional excavation of a drainage gallery, and has large investment; in the method (2), the gap between the outer wall of the steel pipe and the excavated tunnel needs to meet the requirement of installing the entrance space of the drainage system, and the excavated section of the tunnel needs to be increased correspondingly; the drainage distance is long, the outlet flow is difficult to accurately estimate, and potential safety hazards are caused to the operation of electromechanical equipment of a factory building; the drainage plate of the method (3) is easy to block when concrete between the outer wall of the steel pipe and the tunnel is backfilled, so that the drainage effect is influenced; the outer wall of the steel plate is contacted with water flow, so that corrosion is easy to generate; in addition, the steel pipe and the backfilled concrete are separated by the drainage plate, and the joint stress between the steel pipe and the surrounding rock is influenced.

Disclosure of Invention

The utility model aims at providing an it is not enough to prior art exist, the utility model aims at providing a buried pressure steel pipe outer drainage device, its simple structure can effectively reduce penstock's outer water pressure, is applicable to buried pressure steel pipe that the buried depth is big, the external pressure is higher than interior pressure.

The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:

the utility model provides a bury formula pressure steel pipe outer drainage device, includes pressure steel pipe, industry soap, annular channel-section steel, inlet tube, check valve, outlet pipe, the outer wall of the same cross section department of pressure steel pipe sets up the closed annular channel-section steel of round, and the cavity that annular channel-section steel and pressure steel pipe outer wall formed is as the water catch bowl, and it is fixed that annular channel-section steel and pressure steel pipe outer wall adopt spot welding, and the gap of the no welding seam department between annular channel-section steel and the pressure steel pipe uses industry soap to clog, and the bottom of annular channel-section steel links to each other with the inlet tube, and the inlet tube passes through the check valve and links to each.

Furthermore, a round hole is formed in the bottom of the annular channel steel and connected with a water inlet pipe, the water inlet pipe is connected with the inlet end of the check valve through a flange, the outlet end of the check valve is connected with a water outlet pipe through a flange, and a round hole is formed in the wall of the pressure steel pipe and connected with the water outlet pipe.

Furthermore, the check valve is internally provided with a valve clack which works automatically, when the water collecting tank is full of water, water flow rushes the valve clack of the check valve and is discharged into the pressure steel pipe through the water outlet pipe, and when external pressure is reduced, the valve clack of the check valve is closed under the action of internal pressure.

Furthermore, a plurality of annular channel steel are evenly arranged along the length direction of the pressure steel pipe.

The utility model discloses a structure has following advantage:

(1) extra excavation of a drainage gallery is not needed, and the tunnel is small in excavation size during installation, so that investment is saved;

(2) the drainage device is installed before the pressure steel pipe is installed, so that the field construction amount can be reduced;

(3) the water outside the pressure steel pipe can be discharged into the pressure steel pipe through the water inlet pipe, the check valve and the water outlet pipe, the drainage distance of the whole device is short, and the flow is easy to control.

Drawings

FIG. 1 is a schematic structural view of the water discharge device of the buried penstock of the present invention;

fig. 2 is an enlarged view of a portion a in fig. 1.

In the figure: 1-pressure steel pipe, 2-industrial soap, 3-annular channel steel, 4-water collecting tank, 5-water inlet pipe, 6-check valve, 6.1-valve clack, and 7-water outlet pipe.

Detailed Description

The technical solution of the present invention is further described in detail with reference to the accompanying drawings, but the scope of protection is not limited thereto.

Referring to fig. 1 and 2, an embodiment of the present invention provides an external drainage device of a buried pressure steel pipe, including a pressure steel pipe 1, an industrial soap 2, an annular groove steel 3, a water inlet pipe 5, a check valve 6, and a water outlet pipe 7.

The outer wall of the same cross section of the pressure steel pipe 1 is provided with a circle of closed annular channel steel 3, a plurality of annular channel steel 3 are uniformly arranged along the length direction of the pressure steel pipe 1, see fig. 1, and a cavity formed by the annular channel steel 3 and the outer wall of the pressure steel pipe 1 is used as a water collecting tank 4. The annular channel steel 3 and the outer wall of the pressure steel pipe 1 are fixed by spot welding, and a gap at a position without a welding seam between the annular channel steel 3 and the pressure steel pipe 1 is filled with industrial soap 2, so that concrete slurry is prevented from entering a water collecting tank 4 when concrete is backfilled. The bottom of the annular channel steel 3 is provided with a round hole which is connected with a water inlet pipe 5, the water inlet pipe 5 is connected with the inlet end of a check valve 6 through a flange, the outlet end of the check valve 6 is connected with a water outlet pipe 7 through a flange, and the pipe wall of the pressure steel pipe 1 is provided with a round hole which is connected with the water outlet pipe 7. The function of the non-return valve 6 is to allow fluid flow in one direction only and to prevent fluid flow in the opposite direction, the flap 6.1 provided in the non-return valve 6 being self-acting. Under the action of the pressure of the fluid flowing in one direction, the valve flap 6.1 is opened, and when the fluid flows in the opposite direction, the valve flap 6.1 is closed due to the action of the pressure of the fluid and the like, so that the flow is cut off.

The utility model discloses the theory of operation: the outer water constantly infiltrates around the pressure steel pipe 1 outer wall, when the outer water is full of the crack around the pressure steel pipe 1 outer wall, pressure increases, when outer water pressure surpassed a definite value, outer water washes away industrial soap 4, flow into water catch bowl 4 along the gap of annular channel-section steel 3 with the pressure steel pipe 1 outer wall, get into inlet tube 5, when water catch bowl 4 was full of the water, because external pressure is greater than interior pressure, rivers washed open the valve clack 6.1 of check valve 6, it is intraductal to discharge into the steel through outlet pipe 7, when the external pressure reduced, valve clack 6.1 of check valve 6 was closed under the internal pressure effect, a drainage process has been accomplished this moment. The time interval from closing to opening of the valve clack 6.1 of the check valve 6 can reflect the external water quantity of the pressure steel pipe 1, the external water quantity is large, the time interval is short, and when groundwater develops, the valve clack 6.1 of the check valve 6 can be always in an open state for drainage.

When the pressure steel pipe sections are manufactured, the external drainage device of the pressure steel pipe is fixedly arranged on the outer sides of the pipe sections, and when the pressure steel pipe sections are installed on site, the external wall of the pressure steel pipe does not need to be reserved for a human entering space to install the external drainage device, and all installation work of the pressure steel pipe can be completed in the pipe. The water outside the pressure steel pipe is directly discharged into the steel pipe through the check valve 6, and the water in the steel pipe cannot flow into the outer wall of the steel pipe.

The above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (4)

1. The utility model provides a water installation is arranged outward to formula of burying pressure steel pipe which characterized in that: including pressure steel pipe (1), industrial soap (2), ring channel steel (3), inlet tube (5), check valve (6), outlet pipe (7), the outer wall of the same cross section department of pressure steel pipe (1) sets up round confined annular channel-section steel (3), the cavity that annular channel-section steel (3) and pressure steel pipe (1) outer wall formed is as water catch bowl (4), annular channel-section steel (3) adopt spot welding fixed with pressure steel pipe (1) outer wall, industrial soap (2) are packed in the gap of the no welding seam department between annular channel-section steel (3) and pressure steel pipe (1), the bottom of annular channel-section steel (3) links to each other with inlet tube (5), inlet tube (5) link to each other with outlet pipe (7) through check valve (6), the export and inlet tube (5) intercommunication of outlet pipe (7).

2. The water discharge device of the embedded pressure steel pipe of claim 1, wherein: the bottom of the annular channel steel (3) is provided with a round hole which is connected with a water inlet pipe (5), the water inlet pipe (5) is connected with an inlet end of a check valve (6) through a flange, an outlet end of the check valve (6) is connected with a water outlet pipe (7) through a flange, and the pipe wall of the pressure steel pipe (1) is provided with a round hole which is connected with the water outlet pipe (7).

3. The water discharge device of the embedded pressure steel pipe of claim 1, wherein: the check valve (6) is internally provided with a valve clack (6.1) which works automatically, when the water collecting tank (4) is full of water, water flow rushes the valve clack (6.1) of the check valve (6) and is discharged into the pressure steel pipe (1) through the water outlet pipe (7), and when external pressure is reduced, the valve clack (6.1) of the check valve (6) is closed under the action of the internal pressure.

4. The water discharge device of the embedded pressure steel pipe of claim 1, wherein: a plurality of annular channel steel (3) are uniformly arranged along the length direction of the pressure steel pipe (1).

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