Pressure-limiting drainage structure suitable for preventing instability of steel lining of ultra-deep vertical shaft pressure steel pipe

Abstract

The utility model discloses a pressure-limiting drainage structure suitable for preventing instability of a steel lining of an ultra-deep vertical shaft pressure steel pipe, and belongs to the field of water conservancy and hydropower engineering. The drainage system comprises a concrete lining, a connecting pipe, transverse rectangular drainage boxes, a longitudinal drainage main pipe, a steel lining and a pressure steel pipe, the concrete lining is arranged on the outer side of the steel lining of the pressure steel pipe, the transverse rectangular drainage boxes are arranged on the side wall of the steel lining, and the transverse rectangular drainage boxes are communicated through pipelines. The transverse rectangular drainage box is provided with a plurality of drainage holes communicated with an inner cavity of the transverse rectangular drainage box, and the longitudinal drainage main pipe is communicated with the interior of the transverse rectangular drainage box through a connecting pipe. The problems that an existing pressure steel pipe outer drainage structure is mainly used for drainage of transverse tunnels and tunnels, is difficult to adapt to an ultra-deep vertical shaft structure which is built vertically or longitudinally and is large in burial depth, and is difficult to conveniently and accurately enable external water pressure to reach a certain limit value through drainage are solved. The manufacturing cost is low, raw materials are easy to obtain, construction is convenient, the construction cost is low, and comprehensive performance is excellent.

Description

Technical Field

[0001] The utility model relates to a pressure-limiting drainage structure suitable for preventing steel lining instability of ultra-deep vertical shaft pressure steel pipes, and belongs to the technical field of water conservancy and hydropower engineering. Background Art

[0002] In order to realize the allocation and dispatch of water resources across river basins and promote the interconnection of national water networks, a large number of major water diversion projects, including the Dianzhong Water Diversion Project, the Yangtze River to Han River Diversion Project, the Han River to Wei River Diversion Project, and the South-to-North Water Diversion Middle Route Subsequent Project, have been built in the mountainous areas of the central and western regions, most of which use long-distance tunnel water delivery. There are many high mountains and steep ridges in the southwest of my country, with extremely strong crustal movement, frequent earthquake activities, and particularly complex geological structures. It presents complex terrain and geomorphic features such as deep river valleys, deep rivers, steep slopes, and towering mountains. As an indispensable and important part of the water diversion tunnel, the vertical shaft has the characteristics of deep burial depth, large vertical shaft depth, and very complex geological conditions for the vertical shaft to cross due to the complex terrain and geological conditions in the southwest. In the water diversion and water conservancy and hydropower projects in the southwest, the ultra-deep vertical shafts are often located entirely below the groundwater level. The problem of water leakage in the ultra-deep vertical shafts during construction is a common problem when the vertical shafts cross water-rich areas. Water leakage has serious consequences for the operation of ultra-deep shafts, and ultra-deep shaft drainage has become a key issue in shaft engineering construction. Once leakage occurs in an ultra-deep shaft, it will be very difficult to control it. Compared with preventing leakage, the control construction is difficult, costly, and ineffective, and it is often a temporary solution rather than a fundamental solution. The longitudinal construction characteristics of the shaft determine the inevitable pressure difference between its bottom and top. Under the long-term effects of external water pressure and surrounding rock pressure, the lining structure of the ultra-deep shaft has long-term safety problems.

[0003] Therefore, it is necessary to propose a new type of pressure-limited drainage structure for preventing steel lining instability of ultra-deep vertical shaft pressure pipes, in view of the characteristics of ultra-deep vertical shafts, such as large burial depth, large vertical shaft depth, very complex geological conditions of vertical shaft crossing, and serious water leakage problems, so as to solve the above technical problems. Utility Model Content

[0004] The purpose of the research and development of the utility model is to overcome the problem that the current pressure steel pipe external drainage structure is mainly used for drainage of horizontal tunnels and tunnels, and it is difficult to apply to ultra-deep shaft structures with large burial depths in vertical or longitudinal construction, and it is difficult to conveniently and accurately reach a certain limit value of the external water pressure through drainage. A brief overview of the utility model is given below to provide a basic understanding of certain aspects of the utility model. It should be understood that this overview is not an exhaustive overview of the utility model. It is not intended to determine the key or important parts of the utility model, nor is it intended to limit the scope of the utility model.

[0005] The technical solution of this utility model:

[0006] A pressure-limited drainage structure suitable for preventing steel lining instability of ultra-deep vertical shaft pressure steel pipes comprises a concrete lining, a connecting pipe, a transverse rectangular drainage box, a longitudinal drainage main pipe, a steel lining and a pressure steel pipe. A concrete lining is arranged on the outer side of the steel lining of the pressure steel pipe, a plurality of transverse rectangular drainage boxes are arranged on the side wall of the steel lining, and the plurality of transverse rectangular drainage boxes are connected by pipelines. The transverse rectangular drainage box is a hollow structure, and a plurality of drainage holes connected to the internal chamber thereof are arranged on the transverse rectangular drainage box, and the longitudinal drainage main pipe is connected to the interior of the transverse rectangular drainage box through a connecting pipe.

[0007] Preferably, the plurality of transverse rectangular drainage boxes are arranged in a circular array.

[0008] Preferably, the longitudinal drainage main pipe is located at 30° to the left and right of the vertical line centered on the axis of the penstock.

[0009] Preferably: the outer side of the transverse rectangular drainage box is fixedly wrapped with a geotextile, and the external water between the concrete lining and the pressure steel pipe passes through the geotextile, enters the internal chamber of the transverse rectangular drainage box from the drainage hole, and then converges to the longitudinal drainage main pipe through the transverse rectangular drainage box to be discharged outside the concrete lining.

[0010] Preferably, two stiffening rings are fixedly provided on the outer side of the steel liner, and the transverse rectangular drainage box is fixedly clamped between the two stiffening rings.

[0011] Preferably, the connecting pipe is connected to the longitudinal drainage main pipe through a three-way pipe.

[0012] The utility model has the following beneficial effects:

[0013] 1. The utility model can effectively solve the serious water leakage problem of deep buried ultra-deep shafts and ensure the safe and stable operation of the pressure steel pipe in the water diversion tunnel;

[0014] 2. The utility model controls the external water pressure of the pressure steel pipe steel lining structure to reach any limited value by adjusting the arrangement form and density of the transverse rectangular drainage boxes, which can effectively ensure that the external water pressure of the pressure steel pipe steel lining structure is controlled;

[0015] 3. The utility model maximizes the contact area and contact state between the steel lining and the concrete lining, thereby effectively solving the problem of local stress concentration of the pressure steel lining;

[0016] 4. The utility model is provided with a geotextile fixedly wrapped on the outside of the transverse rectangular drainage box, which can effectively solve the problem of drainage structure blockage during the construction of ultra-deep shafts;

[0017] 5. The utility model has low manufacturing cost, easy to obtain raw materials, convenient construction, low engineering cost, and excellent comprehensive performance. It provides a useful reference for other similar projects and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a pressure-limited drainage structure suitable for preventing steel lining instability of ultra-deep shaft pressure steel pipes;

[0019] Figure 2 yes Figure 1 The enlarged view of point Ⅰ;

[0020] Figure 3 yes Figure 1 AA section view;

[0021] Figure 4 yes Figure 1 BB cross-section diagram;

[0022] In the figure, 1-concrete lining, 2-stiffening ring, 3-connecting pipe, 4-transverse rectangular drainage box, 5-longitudinal drainage main pipe, 6-geotextile, 7-steel lining, 8-pressure steel pipe, 9-tee pipe. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described below by specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0024] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection, including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: choose welding connection for fixed connection and hinge connection for detachable connection.

[0025] Specific implementation method 1: Combination Figure 1-Figure 4The present embodiment is described. The present embodiment is a pressure-limited drainage structure suitable for preventing the steel lining from destabilizing in an ultra-deep shaft pressure steel pipe, comprising a concrete lining 1, a connecting pipe 3, a transverse rectangular drainage box 4, a longitudinal drainage main pipe 5, a steel lining 7 and a pressure steel pipe 8. The outer side of the steel lining 7 of the pressure steel pipe 8 is provided with a concrete lining 1, and a plurality of transverse rectangular drainage boxes 4 are arranged on the side wall of the steel lining 7. Two stiffening rings 2 are fixedly provided on the outer side of the steel lining 7, and the transverse rectangular drainage box 4 is fixedly clamped between the two stiffening rings 2. The plurality of transverse rectangular drainage boxes 4 are connected by pipelines. The transverse rectangular drainage box 4 is a hollow structure, and the middle of its internal chamber is not filled with material. The transverse rectangular drainage box 4 is provided with a plurality of drainage holes connected with its internal chamber. The longitudinal drainage main pipe 5 is connected with the interior of the transverse rectangular drainage box 4 through the connecting pipe 3, and the connecting pipe 3 is connected with the longitudinal drainage main pipe 5 through the tee pipe 9.

[0026] The multiple transverse rectangular drainage boxes 4 are arranged in a circular array with a size of 70mm×30mm and a row spacing of 2m. The flow rate of external water can be controlled by adjusting the arrangement and density of the transverse rectangular drainage boxes 4, thereby controlling the external water pressure of the steel lining 7 of the pressure steel pipe 8 to reach any limited value, which can effectively ensure that the external water pressure of the steel lining 7 of the pressure steel pipe 8 is controlled, and at the same time, the contact state and contact area between the steel lining 7 and the concrete lining 1 are guaranteed to the greatest extent, and the joint load-bearing mode of the steel lining 7 and the concrete lining 1 under the action of the internal water pressure is effectively guaranteed, thereby effectively solving the problem of local stress concentration in the steel lining 7.

[0027] The longitudinal drainage main pipe 5 is located at 30° to the left and right of the vertical line of the axis of the pressure steel pipe 8.

[0028] The outer side of the transverse rectangular drainage box 4 is fixedly wrapped with a geotextile 6, which has a good filtering and isolating effect on impurities, especially for hydropower stations, which are often built in high mountain canyon environments. The suspended sediment content in the basin is relatively high and the diameter of the sediment particles is relatively large. If the sediment enters the water diversion system of the power station, it will cause wear on the downstream units and seriously affect the stable operation of the units. The external water between the concrete lining 1 and the pressure steel pipe 8 passes through the geotextile 6 to filter out the sediment particles and impurities in the water, and then enters the internal chamber of the transverse rectangular drainage box 4 from the drainage hole, and then converges to the longitudinal drainage main pipe 5 through the transverse rectangular drainage box 4, and finally is discharged together from the concrete lining 1.

[0029] The connecting pipe 3 is a PE pipe with a hole diameter of 75 mm, and the longitudinal drainage main pipe 5 is a circular PE pipe with a hole diameter of 110 mm.

[0030] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the utility model will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the utility model.

[0031] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pressure-limiting drainage structure suitable for preventing steel lining instability in ultra-deep shaft pressure steel pipes, characterized in that: The invention comprises a concrete lining (1), a connecting pipe (3), a transverse rectangular drainage box (4), a longitudinal drainage main pipe (5), a steel lining (7) and a pressure steel pipe (8), wherein the concrete lining (1) is arranged on the outer side of the steel lining (7) of the pressure steel pipe (8), a plurality of transverse rectangular drainage boxes (4) are arranged on the side wall of the steel lining (7), and the plurality of transverse rectangular drainage boxes (4) are connected through pipelines, the transverse rectangular drainage box (4) is a hollow structure, and a plurality of drainage holes connected to the internal chamber of the transverse rectangular drainage box (4) are arranged on the transverse rectangular drainage box (4), and the longitudinal drainage main pipe (5) is connected to the interior of the transverse rectangular drainage box (4) through the connecting pipe (3).

2. According to claim 1, a pressure-limiting drainage structure suitable for preventing steel lining instability of ultra-deep shaft pressure steel pipes is characterized by: The plurality of transverse rectangular drainage boxes (4) are arranged in a circular array.

3. According to claim 1, a pressure-limiting drainage structure suitable for preventing steel lining instability of ultra-deep shaft pressure steel pipes is characterized by: The longitudinal drainage main pipe (5) is located at 30° to the left and right of the vertical line of the axis of the pressure steel pipe (8).

4. The pressure-limiting drainage structure for preventing steel lining instability of ultra-deep shaft pressure steel pipes according to claim 3 is characterized by: The outer side of the transverse rectangular drainage box (4) is fixedly wrapped with a geotextile (6). After the external water between the concrete lining (1) and the pressure steel pipe (8) passes through the geotextile (6), it enters the internal chamber of the transverse rectangular drainage box (4) from the drainage hole, and then converges to the longitudinal drainage main pipe (5) through the transverse rectangular drainage box (4) to be discharged outside the concrete lining (1).

5. A pressure-limiting drainage structure suitable for preventing steel lining instability of ultra-deep shaft pressure steel pipes according to any one of claims 1 to 4, characterized in that: Two stiffening rings (2) are fixedly arranged on the outer side of the steel lining (7), and the transverse rectangular drainage box (4) is fixedly clamped between the two stiffening rings (2).

6. The pressure-limiting drainage structure for preventing steel lining instability of ultra-deep shaft pressure steel pipes according to claim 5 is characterized in that: The connecting pipe (3) is connected to the longitudinal drainage main pipe (5) via a three-way pipe (9).

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