CN105805366A - Dry-wet separation method of dry-wet separation check valve for adjustable hydraulic tunnel engineering - Google Patents

Abstract

The invention discloses a dry-wet separation method of an adjustable dry-wet separation check valve used in hydraulic tunnel engineering, and relates to a method for draining water in surrounding rocks by the check valve. It includes checking whether the opening pressure of the check valve is at an appropriate value. If the opening pressure of the check valve is too small, increase the thrust of the spring on the sleeve cap; The thrust of the sleeve cap; after the check valve is placed in the hydraulic tunnel, when the pressure of the water flow on the sleeve cap is greater than the thrust of the spring on the sleeve cap, the sleeve cap moves downward under the action of pressure, this When the water discharge function of the check valve is realized; when the pressure of the water flow on the sleeve cap is less than the thrust of the spring on the sleeve cap, the first drainage hole is in a closed state, and there is no water flow in the first cavity, and the check valve is realized at this time. Dry and wet separation function. The invention solves the problem that the durability of the check valve is affected by corrosion, sediment blockage, soluble salt precipitation and the like in the hydraulic tunnel engineering environment.

Description

Dry-wet separation method of dry-wet separation check valve for adjustable hydraulic tunnel engineering

technical field

The invention relates to a method for a check valve to drain water in surrounding rocks, in particular to a dry-wet separation method for an adjustable hydraulic tunnel engineering dry-wet separation check valve.

Background technique

In hydraulic tunnel engineering, in order to reduce the water pressure in the surrounding rock, it is usually necessary to drill drainage holes in the surrounding rock to drain groundwater. A check valve is installed in the tunnel to limit that groundwater can only flow into the tunnel from the surrounding rock, but not from the tunnel into the surrounding rock mass.

Although existing check valves have multiple structural forms (such as lifting check valves and swing check valves, etc.), the working mechanism inside the existing check valves is not separated from the water in the water flow channel, so that The working mechanism inside the check valve is directly in contact with the water in the water flow channel. However, since the water in the surrounding rock is often mixed with corrosive salts and a large amount of sediment, and soluble salts are easily precipitated in the groundwater, when people apply the existing check valve to the hydraulic tunnel environment, the existing check valve When the valve works in the hydraulic tunnel environment, corrosion and blockage often occur, which will affect the service life of the check valve and even make the check valve useless. If the check valve loses its function or fails to work normally, the water in the surrounding rock will not be drained normally, which will cause the water pressure in the surrounding rock to be too high, resulting in the rupture of the surrounding rock, which will seriously threaten the stability of the tunnel.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the background technology and provide a dry-wet separation method for an adjustable dry-wet separation check valve used in hydraulic tunnel engineering.

In order to achieve the above object, the technical solution of the present invention is: a dry-wet separation method for a dry-wet separation check valve for an adjustable hydraulic tunnel project, which is characterized in that it includes the following construction steps, step 1: after assembling the check valve Finally, check whether the opening pressure of the check valve is at an appropriate value. If the opening pressure of the check valve is too small, twist the adjusting screw to make the spring seat move upwards in the sleeve, thereby increasing the spring force of the spring and increasing the pressure of the spring against the sleeve. The thrust of the barrel cap; if the opening pressure of the check valve is too large, twist the adjusting screw to move the spring seat downward in the sleeve, thereby reducing the spring force, thereby reducing the thrust of the spring on the sleeve cap; Step 2 : After the check valve is placed in the hydraulic tunnel, when there is water flow in the first drainage hole, and the pressure of the water flow on the sleeve cap is greater than the thrust of the spring on the sleeve cap, the sleeve cap will be under the action of pressure Move down, at this time, the top of the sleeve cap is separated from the top of the valve body, the first drain hole and the second drain hole are in a communication state, and the water flow can flow through the first drain hole, the first cavity and the second drain hole in sequence , and can flow out from the second drainage hole, at this time the drainage function of the check valve is realized; Step 3: After the check valve is placed in the hydraulic tunnel, when there is no water flow in the first drainage hole, or the water flow is opposite When the pressure of the sleeve cap is less than the thrust of the spring on the sleeve cap, the sleeve cap is always in contact with the top of the valve body under the action of the thrust. At this time, the first drain hole is closed, and the water flow at the top of the valve body cannot flow into the second drain hole. In the first cavity, at the same time, because the sealing cover has blocked the second drainage hole, the water flow at the bottom of the valve cover cannot flow into the first cavity. At this time, there is no water flow in the first cavity, that is, the backstop is realized at this time. The wet and dry separation function of the valve.

Compared with the existing check valves used in hydraulic tunnel engineering, the present invention has the following advantages:

1. The structure of the present invention is simple and reasonable, and it is easy to manufacture. It solves the problems that the durability of the check valve is affected by corrosion, sediment blockage, and precipitation of soluble salts in the hydraulic tunnel engineering environment. The water flow channel in the check valve ( The water flowing through the circuit formed by the first drainage hole, the first cavity and the second drainage hole) is separated from the working mechanism inside the check valve (the structure composed of the spring, the sleeve and the sleeve cap), and can maintain The dryness of the spring enhances the durability of the check valve.

2. Put the spring in the airtight space formed between the sleeve and the sleeve cap, so that the spring is separated from the water passage, which can prevent the entry of water, sediment and other sundries, keep the inside of the second cavity dry, and increase The durability of the check valve is improved.

3. Since the present invention can adjust the thrust of the spring on the sleeve cap by adjusting the screw, the present invention allows the staff to properly adjust the opening pressure of the check valve according to the water pressure inside the surrounding rock at different positions, thereby improving The applicability of a single check valve.

4. Since the first drainage hole on the valve body is an inclined hole, when the water flow in the surrounding rock enters the first cavity, the water flow can wash the cavity of the valve body, thereby reducing the accumulation of sand inside the valve body .

5. The sealing cover can realize the one-way flow function of the present invention, and the water flow can only flow into the bottom of the valve cover from the first cavity, but cannot flow into the first cavity from the bottom of the valve cover, so that the water flow inside the first cavity can be maintained. Drying can prevent the sealing ring between the sleeve cap and the sleeve from losing its function due to long-term water immersion.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure 1-valve body, 2-sleeve cap, 3-spring, 4-sleeve, 5-spring seat, 6-bonnet, 7-sealing cover, 8-adjusting screw, 9-first drainage hole, 10 -Second drainage hole, 11-first cavity, 12-second cavity, 13-first sealing ring, 14-second sealing ring, 15-third sealing ring, 16-boss, 17-fourth sealing ring.

detailed description

The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, and are only examples. At the same time, the advantages of the present invention are clearer and easier to understand through the description.

Referring to the accompanying drawings, it can be seen that the dry-wet separation method of the adjustable hydraulic tunnel engineering dry-wet separation check valve includes the following construction steps,

Step 1: After assembling the check valve, check whether the opening pressure of the check valve is at an appropriate value. If the opening pressure of the check valve is too small, twist the adjusting screw 8 to move the spring seat 5 upward in the sleeve 4 , thereby increasing the elastic force of the spring 3, thereby increasing the thrust of the spring 3 on the sleeve cap 2; The elastic force of small spring 3, and then reduce the thrust of spring 3 to sleeve cap 2;

Step 2: After putting the check valve into the hydraulic tunnel, when there is water flow in the first drainage hole 9, and the pressure of the water flow on the sleeve cap 2 is greater than the thrust of the spring 3 on the sleeve cap 2, the sleeve The cap 2 moves downward under the action of the pressure. At this time, the top of the sleeve cap 2 is separated from the top of the valve body 1. The first drain hole 9 and the second drain hole 10 are in a communication state, and the water flow can flow through the first drain hole in turn. hole 9, the first cavity 11 and the second drain hole 10, and can flow out from the second drain hole 10, at this time, the drainage function of the check valve is realized;

Step 3: After putting the check valve into the hydraulic tunnel, when there is no water flow in the first drainage hole 9, or the pressure of the water flow on the sleeve cap 2 is less than the thrust of the spring 3 on the sleeve cap 2, the sleeve The cap 2 is always in contact with the top of the valve body 1 under the action of the thrust. At this time, the first drainage hole 9 is in a closed state, and the water flow at the top of the valve body 1 cannot flow into the first cavity 11. At the same time, because the sealing cover 7 has The second drain hole 10 is blocked, and the water flow at the bottom of the valve cover 6 cannot flow into the first cavity 11. At this time, there is no water flow in the first cavity 11, that is, the dry-wet separation function of the check valve is realized at this time.

If the present invention is not provided with a sealing cover 7, then when there is water at the bottom of the valve cover 6, even if the water cannot flow into the first cavity by the second drain hole 10, the first cavity of the valve body 1 will be full of water at this moment. Water, which will affect the sealing between the sleeve cap 2 and the sleeve 4, will make the spring 3 contact with water, thereby affecting the service life of the present invention.

As shown in Figure 1, the structure of the adjustable dry-wet separation check valve for hydraulic tunnel engineering is as follows: it includes a spring 3, a valve body 1 with a first drainage hole 9 on the top, and a valve connected to the lower end of the valve body 1 The cover 6 is characterized in that it also includes a sleeve cap 2 capable of sealing the first drainage hole 9, a sleeve 4 installed on the upper end of the valve cover 6, and a spring seat 5 installed in the sleeve 4; The valve body 1 is provided with a first cavity 11 with an opening downward, and the sleeve cap 2 is provided with a second cavity 12 with an opening downward. Both the sleeve 4 and the sleeve cap 2 are located in the first cavity. In a cavity 11; the valve cover 6 is provided with a number of second drain holes 10, and each second drain hole 10 is provided with a seal that is installed at the bottom of the valve cover 6 and can seal the second drain hole 10. Cover 7; the upper end of the sleeve cap 2 corresponds to the position of the first drain hole 9, the lower end of the sleeve cap 2 is set on the sleeve 4; the upper end of the spring 3 is located in the sleeve cap 2 and connected to the top of the sleeve cap 2, The lower end of the spring 3 is located in the sleeve 4 and connected to the spring seat 5; a first sealing ring 13 is provided between the sleeve 4 and the sleeve cap 2, and a second sealing ring is provided between the spring seat 5 and the sleeve 4 14. A fourth sealing ring 17 is provided between the sleeve 4 and the bonnet 6 .

It also includes an adjustment screw 8, the spring seat 5 is in contact with the inner wall of the sleeve 4 and can slide in the sleeve 4, one end of the adjustment screw 8 is in contact with the bottom of the spring seat 5, and the other end is threadedly connected with the valve cover 6 and passes through the valve cover 6. A third sealing ring 15 is provided between the adjusting screw 8 and the valve cover 6 .

The first drainage holes 9 are arranged obliquely, and the included angle between the centerline of the first drainage holes 9 and the horizontal plane is 55-85°.

Due to the separation of the water flow channel (the water flowing through the circuit formed by the first drainage hole, the first cavity and the second drainage hole) from the spring 3, the corrosive substances, sediment and precipitated soluble salts contained in the water will not Being in contact with the spring 3 can ensure that the spring 3 is not corroded or blocked, thereby improving the durability of the present invention.

Other unspecified parts belong to the prior art.

Claims (1)

1. The dry-wet separation method of the dry-wet separation check valve for adjustable hydraulic tunnel engineering is characterized in that: it comprises the following construction steps, Step 1: After assembling the check valve, check whether the opening pressure of the check valve is at an appropriate value. If the opening pressure of the check valve is too small, twist the adjusting screw (8) so that the spring seat (5) is in the sleeve (4) move upwards, thereby increasing the elastic force of the spring (3), and then increasing the thrust of the spring (3) on the sleeve cap (2); if the opening pressure of the check valve is too large, twist the adjusting screw (8) Make the spring seat (5) move downward in the sleeve (4), thereby reducing the elastic force of the spring (3), thereby reducing the thrust of the spring (3) on the sleeve cap (2); Step 2: After putting the check valve into the hydraulic tunnel, when there is water flow in the first drainage hole (9), and the pressure of the water flow on the sleeve cap (2) is greater than that of the spring (3) on the sleeve cap ( 2), the sleeve cap (2) moves downward under the action of pressure, at this time, the top of the sleeve cap (2) is separated from the top of the valve body (1), and the first drainage hole (9) and the second drainage hole The holes (10) are in a connected state, and the water flow can flow through the first drainage hole (9), the first cavity (11) and the second drainage hole (10) in sequence, and can flow from the second drainage hole (10) At this time, the drainage function of the check valve is realized; Step 3: After putting the check valve into the hydraulic tunnel, when there is no water flow in the first drainage hole (9), or the pressure of the water flow on the sleeve cap (2) is less than that of the spring (3) on the sleeve cap ( 2) When the thrust is high, the sleeve cap (2) is always in contact with the top of the valve body (1) under the action of the thrust. Into the first cavity (11), at the same time, because the sealing cover (7) has blocked the second drainage hole (10), the water flow at the bottom of the valve cover (6) cannot flow into the first cavity (11) At this time, there is no water flow in the first cavity (11), that is, the dry-wet separation function of the check valve is realized at this time.