A pre-treatment system prior to excavation

Abstract

A pre-excavation treatment system includes a main discharge pipe, a ring pipe, an upstream pipe section, a downstream pipe section, a middle pipe section, a second discharge pipe, a first discharge pipe, a main pipe, a three-way valve, and a drainage pipe. The three-way valve includes a first three-way valve and a second three-way valve. Water and gas in the rock strata permeate into the ring pipe and mix. The mixture is conducted to the upstream pipe section through the ring pipe. The upstream pipe section is equipped with a first three-way valve, the upper end of which is connected to the first discharge pipe. Gas can be discharged upward through the first discharge pipe. The upstream pipe section, the middle pipe section, and the downstream pipe section are connected sequentially from right to left. The downstream pipe section is equipped with a second three-way valve, the upper end of which is connected to the second discharge pipe.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering, and more specifically to a pre-excavation pretreatment system. Background Technology

[0002] During the construction of existing tunnels, some sections contain water accumulation and coal seam gas. Therefore, it is necessary to drain the water and gas from these sections to ensure construction safety and quality. For example, in the design of the Chengdu-Chongqing Central Line Railway (including Shiling South Station), which our unit was responsible for constructing, the Rongjiawan Tunnel section had this problem. Therefore, after water or gas was detected in the tunnel, it was necessary to drain the water and gas promptly before further excavation.

[0003] In practical engineering work, the following problems exist:

[0004] I. Although there are corresponding drainage and gas discharge devices in the existing technology, the principle they utilize is simply that gas is light and easy to float. When the gas and water mixture flows, the gas floats up through the pipe. However, if the mixture flows too fast, the gas cannot be discharged in time and in full when it passes through the discharge pipe.

[0005] 2. In existing drainage and gas discharge devices, gas is separated from water through the discharge pipe above. However, after the gas is discharged, the flowing mixture loses a portion of its volume, creating a negative pressure. The remaining mixture needs to be replenished to the negative pressure area, which can easily lead to water hammer.

[0006] Third, although there are corresponding drainage and gas discharge devices in the existing technology, the drainage volume and gas discharge volume are different in different road sections or even at different times in different situations. For example, in cases where the water volume is too large and the gas volume is too small, how to deal with the situation in a targeted manner remains to be solved.

[0007] Fourth, although there are corresponding drainage and gas discharge devices in the existing technology, the drainage volume and gas discharge volume are different in different road sections or even at different times in different situations. For example, in the case of all gas, a lot of gas passing through the discharge pipe will flow directly downstream.

[0008] Fifth, existing float-type structures lack stable placement methods. Summary of the Invention

[0009] To overcome the above problems, the present invention proposes a solution that addresses multiple problems simultaneously.

[0010] The technical solution adopted by this invention to solve its technical problem is as follows: a pre-treatment system before excavation, comprising a main discharge pipe, a ring pipe, an upstream pipe section, a downstream pipe section, a middle pipe section, a second discharge pipe, a first discharge pipe, a collection pipe, a three-way valve, and a drainage pipe; the three-way valve includes a first three-way valve and a second three-way valve; water and gas in the rock strata permeate into the ring pipe and mix, and the mixture is conducted to the upstream pipe section through the ring pipe; the upstream pipe section is equipped with a first three-way valve, the upper end of which is connected to the first discharge pipe, and the gas can be discharged upward through the first discharge pipe; the upstream pipe section, the middle pipe section, and the downstream pipe section are connected sequentially from right to left; the downstream pipe section is equipped with a second three-way valve, the upper end of which is connected to the second discharge pipe, and the gas can be discharged upward through the second discharge pipe; the first and second discharge pipes are both connected to the collection pipe at the top, and the middle part of the collection pipe is connected to the main discharge pipe; a drainage pipe is connected to the middle pipe; when the mixture is transferred to the middle pipe, part of the water is discharged through the drainage pipe, and the remaining mixture continues to enter the downstream pipe section;

[0011] The three-way valve includes a valve body, valve core, valve seat, connecting block, connecting pipe one, connecting pipe two, connecting pipe three, cavity, stop block, water pressure sensor, and electrical components; the electrical components include a drive unit and a controller.

[0012] The valve body contains a valve core that can rotate within the valve body. The valve body also contains a valve seat, an inlet, an outlet 1, and an outlet 2. The valve core contains a valve port 1, a valve port 2, and a valve port 3. The left side of the valve body is connected to one end of the connecting block, and the other end of the connecting block is connected to the connecting pipe 1. The right side of the valve body is connected to the connecting pipe 2, and the upper end of the valve body is connected to the connecting pipe 3. The front end of the valve body is connected to a driving component that can drive the valve core to rotate.

[0013] The connecting block includes a cylindrical inner cavity, with the water pressure sensor installed at the lower end of the cylindrical inner cavity and the stop block installed at the upper end of the cylindrical inner cavity. The connecting block above the cylindrical inner cavity has a cavity. When the water level in the cylindrical inner cavity rises, the stop block can be pushed into the cavity. The left end and the right end of the cavity are both inclined surfaces.

[0014] The stop block includes a shaped float plate, a blocking part, a head, and a guide part. The shaped float plate is located at the top, and the blocking part, head, and guide part are arranged below the shaped float plate. The blocking part, guide part, and head are arranged sequentially from left to right. The guide part includes a guide arc surface that connects the head and the blocking part. The left side of the blocking part includes a plane that extends obliquely in the vertical direction, and the right side of the head converges into a line that extends obliquely in the vertical direction. The shape of the shaped float plate is adapted to the shape of the cavity.

[0015] When the inlet is aligned with valve port three, and valve port one is aligned with outlet one, and valve port two is aligned with outlet two, water flows from pipe two to pipe one, and gas flows from pipe two to pipe three. When the water pressure sensor does not detect water pressure, it sends a signal to the controller, which controls the valve core to rotate so that the inlet is aligned with valve port two, valve port one is aligned with outlet two, and gas flows from pipe two to pipe three.

[0016] Preferably, the first, second, and third connecting pipes all include connecting ears.

[0017] Preferably, the valve seat is provided in three sets.

[0018] Preferably, the end of the shaping float is provided with a protrusion.

[0019] Preferably, the cavity has grooves and protrusions on the corresponding wall surface to match.

[0020] Preferably, the bump can slide along the groove.

[0021] Preferably, the protrusion can be positioned within the groove.

[0022] Preferably, a sealing element is provided between the shaped float and the wall of the cavity.

[0023] Preferably, the head includes a first portion, which includes a triangular cross-section.

[0024] Preferably, the head includes a second part, which is a cuboid and is connected to the guide portion.

[0025] The beneficial effects of this invention are:

[0026] I. Regarding the first point raised in the background technology, since the mixture of seepage from the rock strata forms a distribution with gas on top and water below, by setting a baffle structure in the internal passage of the three-way valve, the gas is blocked at the location where the gas flows. The blocked gas stagnates below the discharge pipe, which facilitates its discharge through the discharge pipe.

[0027] Second, regarding the second point raised in the background technology, an integrated conical structure and a water guiding surface are provided in front of the baffle structure. The conical structure achieves flow tangential guidance to reduce water hammer, and the water guiding surface guides water flow to reduce irregular water hammer. Thus, an independent block structure simultaneously achieves the functions of blocking air and guiding flow.

[0028] Thirdly, regarding the third point raised in the background technology, a connecting block is attached to the valve body, and a cavity is provided in the connecting block. The previously mentioned stop block can slide in and out of the cavity. When the water volume is too large, the stop block can be pushed upward. At the same time, a shaped float plate is provided above the stop block, the shape of which is adapted to the shape of the cavity to position the stop block in the cavity. At the same time, the float plate increases the buoyancy of the entire stop block. Thus, when the water volume is too large, the stop block will be pushed upward, so as not to obstruct the water flow. At the same time, the stop block and the cavity are also connected by a structure such as a slide rail to realize the stroke movement and stroke limitation.

[0029] Fourthly, in response to the fourth point raised in the background technology, a water flow sensor, such as a water pressure sensor, is installed in the connecting block. When the water pressure sensor does not detect water, it transmits a signal to the controller, which controls the three-way valve core to rotate, so that the valve outlet is directly connected to the discharge pipe.

[0030] Fifth, regarding the fifth point raised in the background technology, a matching inclined surface is set on the cavity and the inclined surface. When the shaping float moves the baffle upward and the water volume decreases, the baffle will not fall freely. At the same time, when the three-way valve changes its application mode and position, such as when one end of the connecting block is facing upward (i.e., Figure 2 The device shown can be rotated 90 degrees to the left or right. The block slides into the cavity by gravity with the help of the inclined plane, thus no longer forming an obstruction and forming a normal valve structure, thereby increasing the applicability of the three-way valve of the present invention. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 This is a diagram of the overall system for generating and processing water-air mixtures according to the present invention.

[0033] Figure 2 For the present invention Figure 1 Internal structure diagram of a three-way valve

[0034] Figure 3 A side view of an embodiment of the arrangement of the blocks of the present invention.

[0035] Figure 4 Top view of another embodiment of the arrangement of the blocks of the present invention

[0036] Figure 5 Side view of another embodiment of the arrangement of the blocks of the present invention

[0037] Figure 6 This is a front view of the annular tube of the present invention.

[0038] Figure 7 This is a top view of the annular tube of the present invention.

[0039] Figure 8This is a top view of the main discharge pipe located at the tunnel end in the pretreatment system of the present invention.

[0040] The reference numerals in the figure are as follows:

[0041] 1. Main discharge pipe, 2. Ring pipe, 3. Upstream pipe section, 4. Downstream pipe section, 5. Middle section pipe, 6. Second discharge pipe, 7. First discharge pipe, 8. Combined pipe, 9. First three-way valve, 10. Second three-way valve, 11. First three-way connector, 12. Second three-way connector, 13. Drain pipe, 14. Valve body, 15. Valve core, 16. Valve seat, 17. Connecting block, 18. Pipe 1, 19. Pipe 2, 20. Pipe 3, 21. Cavity, 22. Stop block, 23. Water pressure sensor, 24. Outlet 1, 25. Outlet 2, 26. Valve port 1, 27. Valve port 2, 28. Valve port 3, 29. Inlet, 30. Shaped float plate, 31. Blocking part, 32. Head, 33. Guide part, 34. Guide surface, 35. Side ditch. Detailed Implementation

[0042] like Figure 1 The diagram shows a pre-excavation treatment system, comprising a main discharge pipe, a ring pipe, an upstream pipe section, a downstream pipe section, a middle pipe section, a second discharge pipe, a first discharge pipe, a converging pipe, a three-way valve, and a drainage pipe. The three-way valve includes a first three-way valve and a second three-way valve. Water and gas in the rock strata permeate into the ring pipe and mix. The mixture is conducted to the upstream pipe section through the ring pipe. The upstream pipe section is equipped with a first three-way valve, the upper end of which is connected to the first discharge pipe, allowing gas to be discharged upwards through the first discharge pipe. The upstream, middle, and downstream pipe sections are connected sequentially from right to left. The downstream pipe section is equipped with a second three-way valve, the upper end of which is connected to the second discharge pipe, allowing gas to be discharged upwards through the second discharge pipe. The first and second discharge pipes are both connected to the converging pipe at the top, and the converging pipe is connected to the main discharge pipe in the middle. A drainage pipe is connected to the middle pipe. When the mixture is transferred to the middle pipe, some water is discharged into a side ditch through the drainage pipe, while the remaining mixture continues to enter the downstream pipe section.

[0043] like Figure 2-3 As shown: The three-way valve includes a valve body, valve core, valve seat, connecting block, connecting pipe one, connecting pipe two, connecting pipe three, cavity, stop block, water pressure sensor, and electrical components; the electrical components include a drive unit and a controller;

[0044] The valve body contains a valve core that can rotate within the valve body. The valve body also contains a valve seat, an inlet, an outlet 1, and an outlet 2. The valve core contains a valve port 1, a valve port 2, and a valve port 3. The left side of the valve body is connected to one end of the connecting block, and the other end of the connecting block is connected to the connecting pipe 1. The right side of the valve body is connected to the connecting pipe 2, and the upper end of the valve body is connected to the connecting pipe 3. The front end of the valve body is connected to a driving component that can drive the valve core to rotate.

[0045] The connecting block includes a cylindrical inner cavity, with the water pressure sensor installed at the lower end of the cylindrical inner cavity and the stop block installed at the upper end of the cylindrical inner cavity. The connecting block above the cylindrical inner cavity has a cavity. When the water level in the cylindrical inner cavity rises, the stop block can be pushed into the cavity. The left end and the right end of the cavity are both inclined surfaces.

[0046] The stop block includes a shaped float plate, a blocking part, a head, and a guide part. The shaped float plate is located at the top, and the blocking part, head, and guide part are arranged below the shaped float plate. The blocking part, guide part, and head are arranged sequentially from left to right. The guide part includes a guide arc surface that connects the head and the blocking part. The left side of the blocking part includes a plane that extends obliquely in the vertical direction, and the right side of the head converges into a line that extends obliquely in the vertical direction. The shape of the shaped float plate is adapted to the shape of the cavity.

[0047] When the inlet is aligned with valve port three, and valve port one is aligned with outlet one, and valve port two is aligned with outlet two, water flows from pipe two to pipe one, and gas flows from pipe two to pipe three. When the water pressure sensor does not detect water pressure, it sends a signal to the controller, which controls the valve core to rotate so that the inlet is aligned with valve port two, valve port one is aligned with outlet two, and gas flows from pipe two to pipe three.

[0048] The first, second, and third connecting pipes all include connecting lugs. Three sets of valve seats are provided. A protrusion is provided at the end of the shaped float. A groove is provided on the corresponding wall surface of the cavity to fit the protrusion. The protrusion can slide along the groove. The protrusion can be limited within the groove. A sealing element is provided between the shaped float and the wall surface of the cavity. The head includes a first part, which has a triangular cross-section. The head also includes a second part, which is a cuboid connected to the guide portion.

[0049] Figure 4 , Figure 5 The middle example is an embodiment of another block arrangement, the difference being that the shaped floating plate extends from the upper end of the guide to both sides and from the upper end of the blocking part to the right, rather than being manufactured as a single plate.

[0050] The above detailed description is a specific description of feasible embodiments of the present invention. These embodiments are not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included in the patent scope of this case.

Claims

1. A pre-treatment system for excavation, characterized in that: The system includes a main discharge pipe, a ring pipe, an upstream pipe section, a downstream pipe section, a middle pipe section, a second discharge pipe, a first discharge pipe, a converging pipe, a three-way valve, and a drain pipe. The three-way valve includes a first three-way valve and a second three-way valve. Water and gas in the rock strata permeate into the ring pipe and mix. The mixture is conducted to the upstream pipe section through the ring pipe. The upstream pipe section is equipped with a first three-way valve, the upper end of which is connected to the first discharge pipe, allowing gas to be discharged upwards through the first discharge pipe. The upstream, middle, and downstream pipe sections are connected sequentially from right to left. The downstream pipe section is equipped with a second three-way valve, the upper end of which is connected to the second discharge pipe, allowing gas to be discharged upwards through the second discharge pipe. The first and second discharge pipes are both connected to the converging pipe at the top, and the converging pipe is connected to the main discharge pipe in the middle. A drain pipe is connected to the middle pipe. When the mixture is transferred to the middle pipe, some water is discharged through the drain pipe, and the remaining mixture continues to enter the downstream pipe section. The three-way valve includes a valve body, valve core, valve seat, connecting block, connecting pipe one, connecting pipe two, connecting pipe three, cavity, stop block, water pressure sensor, and electrical components; the electrical components include a drive unit and a controller. The valve body contains a valve core that can rotate within the valve body. The valve body also contains a valve seat, an inlet, an outlet 1, and an outlet 2. The valve core contains a valve port 1, a valve port 2, and a valve port 3. The left side of the valve body is connected to one end of the connecting block, and the other end of the connecting block is connected to the connecting pipe 1. The right side of the valve body is connected to the connecting pipe 2, and the upper end of the valve body is connected to the connecting pipe 3. The front end of the valve body is connected to a driving component that can drive the valve core to rotate. The connecting block includes a cylindrical inner cavity, with the water pressure sensor installed at the lower end of the cylindrical inner cavity and the stop block installed at the upper end of the cylindrical inner cavity. The connecting block above the cylindrical inner cavity has a cavity. When the water level in the cylindrical inner cavity rises, the stop block can be pushed into the cavity. The left end and the right end of the cavity are both inclined surfaces. The stop block includes a shaped float plate, a blocking part, a head, and a guide part. The shaped float plate is located at the top, and the blocking part, head, and guide part are arranged below the shaped float plate. The blocking part, guide part, and head are arranged sequentially from left to right. The guide part includes a guide arc surface that connects the head and the blocking part. The left side of the blocking part includes a plane that extends obliquely in the vertical direction, and the right side of the head converges into a line that extends obliquely in the vertical direction. The shape of the shaped float plate is adapted to the shape of the cavity. When the inlet is aligned with valve port three, and valve port one is aligned with outlet one, and valve port two is aligned with outlet two, water flows from pipe two to pipe one, and gas flows from pipe two to pipe three. When the water pressure sensor does not detect water pressure, it sends a signal to the controller, which controls the valve core to rotate so that the inlet is aligned with valve port two, valve port one is aligned with outlet two, and gas flows from pipe two to pipe three.

2. The pre-excavation pretreatment system according to claim 1, characterized in that: Connector 1, Connector 2, and Connector 3 all include connecting ears.

3. The pre-excavation pretreatment system according to claim 1, characterized in that: The valve seat is provided in three sets.

4. The pre-excavation pretreatment system according to claim 1, characterized in that: The end of the shaping float is provided with a protrusion.

5. The pre-excavation pretreatment system according to claim 4, characterized in that: The cavity has grooves and protrusions on the corresponding wall surface to fit each other.

6. The pre-excavation pretreatment system according to claim 5, characterized in that: The bump can slide along the groove.

7. The pre-excavation pretreatment system according to claim 6, characterized in that: The bump can be positioned within the groove.

8. The pre-excavation pretreatment system according to claim 1, characterized in that: A sealing element is provided between the shaped float and the wall of the cavity.

9. The pre-excavation pretreatment system according to claim 1, characterized in that: The head includes a first portion, which includes a triangular cross-section.

10. A pre-excavation pretreatment system according to claim 9, characterized in that: The head includes a second part, which is a cuboid and is connected to the guide portion.

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