Orifice pressing and sealing device, freezing pipe drilling device and using method

Abstract

The invention provides an orifice compressing and sealing device, a freezing pipe drilling device and a using method.The orifice compressing and sealing device comprises a pressure reducing mechanism, a first compressing mechanism and a second compressing mechanism, the pressure reducing mechanism comprises a pipe body and a pressure reducing part which are connected, a first inner cavity is formed in the pipe body, the pressure reducing part comprises a second inner cavity and a rotary outer cavity, and the first inner cavity is communicated with the second inner cavity; the rotary outer cavity is located on the outer side of the second inner cavity, one end of the second inner cavity is communicated with the first inner cavity, the other end of the second inner cavity is communicated with the rotary outer cavity, a water outlet is formed in the position, close to the pipe body, of the rotary outer cavity, and the first pressing mechanism is arranged on the outer wall of the pipe body and the outer wall of the water outlet in a sleeving mode and used for pressing the water outlet. The second pressing mechanism is arranged at the end, away from the pipe body, of the pressure reducing part and used for being arranged on the freezing pipe in a sleeving mode so as to press the joint of the freezing pipe and the pressure reducing mechanism. The orifice compressing and sealing device not only is simplified in structure and convenient to operate, but also improves the sealing effectiveness and the pressure reduction effect.

Description

Technical Field

[0001] This invention belongs to the field of tunnel freezing pipe drilling technology, and specifically relates to a hole-mouth pressing and sealing device, a freezing pipe drilling device, and a method of using it. Background Technology

[0002] Artificial ground freezing is a primary construction method for subway tunnel connecting passages in water-rich strata. This method requires drilling horizontal or inclined holes in the tunnel lining, installing orifice pipes and sealing devices, and then drilling the freezing pipes. When the connecting passage is located in a sandy soil layer or a confined aquifer, water and mud (sand) inflows are likely to occur at the orifice during the drilling process. This can lead to ground subsidence, settlement of existing buildings and structures, or damage to tunnel segments, seriously impacting construction safety and progress.

[0003] In existing technologies, blowout prevention solutions for drilling frozen pipes mainly employ packing around the frozen pipe and using a compression method to prevent water and mud (sand) from gushing out along the pipe wall. For example, Chinese Patent Publication No. CN214424462U discloses a blowout prevention device for drilling horizontal frozen holes in foundation pits. This device has a simple structure and is easy to operate, but it lacks pressure reduction capabilities and is difficult to handle high-pressure water inrush conditions. Chinese Patent Publication No. CN107664018B discloses a self-controlled blowout prevention device for horizontal and inclined drilling, along with its installation and usage methods. Chinese Patent Publication No. CN112796699A discloses a high-pressure blowout prevention device with an emergency sealing chamber, along with its installation and usage methods. Both of these solutions require external equipment; although they offer good blowout prevention, the systems are complex and require sophisticated operation. Summary of the Invention

[0004] This invention provides an orifice pressing and sealing device, a freezing pipe drilling device and a method of use, which not only simplifies the structure and makes operation convenient, but also improves the sealing effectiveness and pressure reduction effect.

[0005] The technical solution of the present invention is as follows:

[0006] An orifice clamping and sealing device for clamping and sealing the orifice of a frozen pipe drill hole, comprising:

[0007] A pressure-reducing mechanism includes a connected pipe body and a pressure-reducing section. The pipe body has a first inner cavity through which a freezing pipe passes. The pressure-reducing section includes a second inner cavity through which the freezing pipe passes and a swirling outer cavity for guiding and reducing pressure. The swirling outer cavity is located outside the second inner cavity. One end of the second inner cavity is connected to the first inner cavity, and the other end of the second inner cavity is connected to the swirling outer cavity. An outlet is provided near the pipe body in the swirling outer cavity. A through hole for the freezing pipe to pass through is provided at the end of the pressure-reducing section away from the pipe body.

[0008] A first pressing mechanism is sleeved on the outer wall of the pipe body and the outlet, and is used to press the outlet.

[0009] The second clamping mechanism is located at the end of the pressure-reducing part away from the tube body and is used to be sleeved on the freezing tube to clamp the junction of the freezing tube and the pressure-reducing mechanism.

[0010] Furthermore, in the orifice clamping and sealing device, two swirling outer cavities are provided, and the two swirling outer cavities are respectively located on both sides of the water flow direction of the second inner cavity; and / or,

[0011] The swirling outer cavity includes multiple cavity units arranged along the water flow direction, with adjacent cavity units connected to each other, forming a swirling channel within the swirling outer cavity; and / or,

[0012] The outlet is an outwardly sloping opening; and / or,

[0013] The outer wall of the outlet is annular, and a fifth flange is provided around the outer wall of the outlet; and / or,

[0014] The outer vortex cavity is provided with a water inlet, which is located near the through hole and communicates with the second inner cavity; and / or,

[0015] A sixth flange is wound around the outer wall of the end of the pipe body away from the pressure reducing section; and / or,

[0016] The first pressing mechanism, the decompression mechanism, and the second pressing mechanism are located on the same axis.

[0017] Furthermore, in the aforementioned orifice pressing and sealing device, the cavity unit is a teardrop-shaped cavity or a corrugated cavity, with the tip of the cavity unit facing the inlet and the round end of the cavity unit facing the outlet; and / or,

[0018] Each cavity unit is provided with a flow divider.

[0019] Furthermore, in the aforementioned orifice pressing and sealing device, the diverting element is a teardrop-shaped structure or a wave-shaped structure, with the tip of the teardrop-shaped structure facing the inlet; and / or,

[0020] The flow divider is arranged coaxially with the cavity unit.

[0021] Furthermore, in the orifice clamping and sealing device, the first clamping mechanism includes a first clamping sleeve assembly, a first packing box assembly, and a plurality of first connecting members. The first clamping sleeve assembly is sleeved on the outer wall of the pipe body, and the first packing box assembly is sleeved on the outer wall of the pipe body and the outer wall of the outlet. One end of the first packing box assembly is pressed against the outer wall of one end of the first clamping sleeve assembly. The first clamping sleeve assembly and the first packing box assembly are connected by a plurality of first connecting members; and / or,

[0022] The second clamping mechanism includes a second clamping sleeve assembly, a second packing box assembly, and a plurality of second connectors. The second packing box assembly and the second clamping sleeve assembly are used to be sleeved on the freezing tube located outside the pressure reducing section. One end of the second packing box assembly is connected to the end of the pressure reducing section away from the tube body, and the other end of the second packing box assembly is pressed against the outer wall of one end of the second clamping sleeve assembly. The second packing box assembly and the second clamping sleeve are connected by a plurality of second connectors.

[0023] Furthermore, in the orifice clamping and sealing device, the first clamping sleeve assembly includes a first sleeve and a first flange, the first sleeve being sleeved on the outer wall of the pipe body, and the first flange being wound around the outer wall of the first sleeve; and / or,

[0024] The first packing box assembly includes a second sleeve, a second flange, and a first packing. The second sleeve is fitted onto the outer wall of the pipe body and the outer wall of the outlet. The first packing is detachably disposed between the second sleeve and the outer wall of the pipe body. The second flange is wound around the outer wall of the second sleeve; and / or,

[0025] The second clamping sleeve assembly includes a third sleeve and a third flange, the third sleeve being fitted onto the freezing pipe, and the third flange being wound around the outer wall of the third sleeve; and / or,

[0026] The second packing box assembly includes a fourth sleeve, a fourth flange, and a second packing. The fourth sleeve is used to be fitted onto the freezing pipe, and the second packing is detachably disposed between the fourth sleeve and the freezing pipe. The fourth flange is wrapped around the outer wall of the fourth sleeve.

[0027] Furthermore, in the orifice pressing and sealing device, the fourth sleeve and the pressure reducing part are welded together at the end near the through hole.

[0028] A freezing pipe drilling device, comprising:

[0029] An orifice pipe is used to fix it in the opening of the lining, and a drainage pipe is inclinedly provided on the side wall of the orifice pipe.

[0030] A first valve, the inlet end of which is connected to the connection end of the orifice pipe, is used to open and close the channel of the orifice pipe;

[0031] The orifice clamping and sealing device has its tube body connected at the end away from the pressure reducing part to the outlet end of the first valve, for the freezing tube to pass through and for guiding and reducing pressure.

[0032] Furthermore, in the aforementioned freezing pipe drilling device, a second valve is provided at the end of the drain pipe away from the orifice pipe, the second valve being used to open and close the drain pipe; and / or,

[0033] The lining is a lined segment; and / or;

[0034] The first valve is a ball valve.

[0035] A method of using a freezing pipe drilling device, comprising the following steps:

[0036] S1: Fix the orifice pipe inside the opening of the lining, and install the inlet end of the first valve at the connection end of the orifice pipe;

[0037] S2: When the first valve is in the closed state, install the orifice clamping sealing device at the outlet end of the first valve;

[0038] S3: Open the first valve, and pass the freezing tube through the second pressing mechanism, the pressure reducing mechanism, the first valve and the orifice tube of the orifice pressing and sealing device in sequence, and then drill;

[0039] S4: During the drilling of the freezing pipe, if water inrush occurs at a pressure lower than the first preset pressure, the second pressing mechanism and the first pressing mechanism of the orifice pressing and sealing device shall press and seal the freezing pipe.

[0040] If a water surge occurs at a pressure higher than the second preset pressure, the first clamping mechanism is released and the drain pipe is opened. The drain pipe on the orifice pipe and the outlet of the pressure reducing part release the pressure of the water surge. After the pressure is released, the second clamping mechanism is operated to clamp and seal the freezing pipe. Then the drain pipe and the first clamping mechanism are closed to block the water surge.

[0041] The beneficial effects of this invention are as follows:

[0042] The present invention provides an orifice pressing and sealing device, which simplifies the structure and facilitates operation by setting a pressure reducing mechanism, a first pressing mechanism and a second pressing mechanism to work together. At the same time, it improves the reliability of the seal, has a good pressure reducing effect, effectively avoids water leakage at the borehole orifice, ensures the normal progress of drilling operations, reduces the safety hazards caused by seal failure, and improves the overall safety and stability of the operation.

[0043] The pressure-reducing mechanism of this orifice clamping sealing device integrates the functions of flow guidance and pressure reduction into one unit, eliminating the need for complex external equipment.

[0044] The pressure-reducing mechanism of the orifice clamping and sealing device adopts a swirling outer cavity, which significantly extends the water flow path and achieves stable and continuous pressure reduction through eddy current energy dissipation.

[0045] The orifice clamping and sealing device employs multiple diverting components within its rotating outer cavity to further divide the water flow into two paths: a straight path and a semi-circular rotating path. This effectively reduces the kinetic energy of the high-pressure water surge, achieves stable pressure reduction, and ensures the drilling operation of the freezing pipe. Attached Figure Description

[0046] Figure 1 This is a top cross-sectional view of a freezing pipe drilling device according to the present invention;

[0047] Figure 2 This is a schematic diagram of the structure of the orifice pressing and sealing device of the present invention with a portion removed;

[0048] Figure 3 This is a top cross-sectional view of an orifice pressing and sealing device according to the present invention;

[0049] Figure 4 yes Figure 3 Enlarged view of point A;

[0050] Figure 5 yes Figure 3 Enlarged diagram of point B.

[0051] In the diagram: 1. Pressure reducing mechanism; 2. Orifice pipe; 3. First valve; 4. Lining; 5. Freezing pipe; 11. Pipe body; 12. Pressure reducing section; 13. First clamping mechanism; 14. Second clamping mechanism; 111. First inner cavity; 112. Sixth flange; 121. Second inner cavity; 122. Rotating outer cavity; 123. Outlet; 124. Through hole; 125. Inlet; 100. Cavity unit; 101. Fifth flange; 102. Diverter; 131. First clamping sleeve assembly Components; 132, First packing box assembly; 133, First connector; 141, Second clamping sleeve assembly; 142, Second packing box assembly; 143, Second connector; 001, First sleeve; 002, First flange; 003, Second sleeve; 004, Second flange; 005, First packing; 006, Third sleeve; 007, Third flange; 008, Fourth sleeve; 009, Fourth flange; 010, Second packing; 21, Drain pipe; 22, Second valve. Detailed Implementation

[0052] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0053] like Figure 2 and Figure 3 As shown, this embodiment provides an orifice pressing and sealing device for pressing and sealing the orifice of the frozen pipe 5, including a pressure reducing mechanism 1, a first pressing mechanism 13 and a second pressing mechanism 14.

[0054] The pressure reducing mechanism 1 includes a connected tube body 11 and a pressure reducing section 12. Figure 2 In order to facilitate the demonstration of the internal structure of the pressure relief unit 12, part of the cover plate on the pressure relief unit 12 has been removed.

[0055] The pipe body 11 can be configured as a cylindrical structure. A first inner cavity 111 is provided inside the pipe body 11 for the freezing pipe 5 to pass through. The first inner cavity 111 is a through-hole, with a diameter slightly larger than the outer diameter of the freezing pipe 5, ensuring that the freezing pipe 5 can pass through smoothly. The gap between the pipe body 11 and the freezing pipe 5 is used for water flow. A sixth flange 112 is wound around the outer wall of the end of the pipe body 11 away from the pressure reducing section 12.

[0056] The pressure-reducing section 12 can be configured as a flat, symmetrical structure. At the end of the pressure-reducing section 12 furthest from the pipe body 11, a through hole 124 is provided for the freezing pipe 5 to pass through. The diameter of the through hole 124 is slightly larger than the outer diameter of the freezing pipe 5 and is coaxial with the first inner cavity 111. The pressure-reducing section 12 includes a second inner cavity 121 for the freezing pipe 5 to pass through and a swirling outer cavity 122 for guiding and reducing pressure. The swirling outer cavity 122 is located outside the second inner cavity 121. One end of the second inner cavity 121 communicates with and is coaxially arranged with the first inner cavity 111. The other end of the second inner cavity 121 communicates with the inlet 125 of the swirling outer cavity 122, which is close to the through hole 124. An outlet 123 is provided near the pipe body 11 in the swirling outer cavity 122. The outlet 123 can be configured as an outwardly inclined oblique opening. The outer wall of the outlet 123 is preferably annular, and a fifth flange 101 is wound around the outer wall of the outlet 123.

[0057] Specifically, two swirling outer cavities 122 can be configured, with the two swirling outer cavities 122 located on opposite sides of the water flow direction of the second inner cavity 121. Each swirling outer cavity 122 may include seven cavity units 100 arranged along the water flow direction, with adjacent cavity units 100 connected to each other, forming multiple swirling channels. The inlet 125 is connected to the cavity unit 100 near the through hole 124, and the outlet 123 is connected to the cavity unit 100 near the pipe body 11. The cavity unit 100 can preferably be a teardrop-shaped cavity or a wave-shaped cavity, with the tip of the cavity unit 100 facing the inlet 125 and the rounded end facing the outlet 123. The two ends of the rounded end of the cavity unit 100 are respectively a first end and a second end, with an arc-shaped surface between the first end and the second end. The first end of the first cavity unit near the outlet 123 is connected to the outlet 123. The tip of the first cavity unit is connected to the second end of the second cavity unit. The tip of the second cavity unit is connected to the first end of the third cavity unit. The tip of the third cavity unit is connected to the second end of the fourth cavity unit. Following this arrangement, the fifth, sixth, and seventh cavity units are connected. The tip of the seventh cavity unit is connected to the inlet 125, forming a swirling channel. The first, third, fifth, and seventh cavity units are located outside the second inner cavity 121, while the second, fourth, and sixth cavity units are located inside the second inner cavity 121 and close to the freezing pipe. Water flows from the inlet 125 into the seventh cavity unit, swirles within it, and then flows into the sixth cavity unit. It then swirles through the other cavity units in sequence, finally being discharged from the outlet 123 or sealed within the cavity unit 100.

[0058] After the high-pressure fluid is introduced into the first inner cavity 111 of the pipe body 11 along the outer wall of the freezing pipe 5, it enters the two swirling outer cavities 122 through the second inner cavity 121 of the pressure reducing section 12, and then passes through the swirling channel formed by the connection of multiple cavity units 100. The pressure of the water flow is gradually consumed by vortex and friction, thereby achieving effective pressure attenuation. Finally, the depressurized water flow is discharged in an orderly manner from the outlet 123 of the swirling outer cavity 122 near the end of the pipe body 11, completing the pressure relief process.

[0059] The design of the swirling outer cavity 122 significantly extends the water flow path, achieving smooth and continuous pressure reduction through vortex energy dissipation. The design of the pressure-reducing mechanism 1 integrates the functions of flow guidance and pressure reduction into one unit, eliminating the need for complex external equipment.

[0060] The first clamping mechanism 13 is sleeved on the outer wall of the pipe body 11 and the outlet 123, and is used to clamp the outlet 123.

[0061] Specifically, the first clamping mechanism 13 may include a first clamping sleeve assembly 131, a first packing box assembly 132, and a plurality of first connecting members 133. The first clamping sleeve assembly 131 is sleeved on the outer wall of the pipe body 11. The first packing box assembly 132 is sleeved on the outer wall of the pipe body 11 and the outer wall of the outlet 123. One end of the first packing box assembly 132 is pressed against the outer wall of one end of the first clamping sleeve assembly 131, and the first clamping sleeve assembly 131, the first packing box assembly 132, and the fifth flange 101 at the outlet 123 are connected by a plurality of first connecting members 133. The first connecting member 133 is preferably a connecting screw.

[0062] The second pressing mechanism 14 is disposed at the end of the pressure reducing part 12 away from the tube body 11, and is used to be sleeved on the freezing tube 5 to press the junction of the freezing tube 5 and the pressure reducing mechanism 1.

[0063] Specifically, the second clamping mechanism 14 may include a second clamping sleeve assembly 141, a second packing box assembly 142, and a plurality of second connecting members 143. The second packing box assembly 142 and the second clamping sleeve assembly 141 are sleeved on the freezing tube 5 located outside the pressure reducing section 12. One end of the second packing box assembly 142 is connected to the end of the pressure reducing section 12 away from the tube body 11, and the other end of the second packing box assembly 142 is pressed against the outer wall of one end of the second clamping sleeve assembly 141. The second packing box assembly 142 and the second clamping sleeve are connected by a plurality of second connecting members 143. The second connecting members 143 are preferably connecting screws.

[0064] The first pressing mechanism 13, the decompression mechanism 1, and the second pressing mechanism 14 are located on the same axis.

[0065] During the drilling process of the freezing pipe 5, if water flows in at a pressure lower than the first preset pressure, the water flows sequentially into the multiple cavity units 100 of the second inner cavity 121 and the two rotating outer cavities 122 of the pressure reducing section 12 along the gap between the pipe body 11 and the freezing pipe 5. The second connecting member 143 of the second pressing mechanism 14 can be tightened first, so that the second pressing sleeve assembly 141 and the second packing box assembly 142 are pressed against the junction of the freezing pipe 5 and the pressure reducing section 12 to form a seal. Then, the first connecting member 133 of the first pressing mechanism 13 is tightened, so that the first pressing sleeve assembly 131 and the first packing box assembly 132 are pressed against the outer wall of the pipe body 11 and the outlet 123 to form a seal.

[0066] If a water inrush occurs at a pressure higher than the second preset pressure, the water will flow sequentially into the multiple cavity units 100 of the second inner cavity 121 and the two rotating outer cavities 122 of the pressure reducing section 12 along the gap between the pipe body 11 and the freezing pipe 5. The first connecting piece 133 of the first clamping mechanism 13 can be loosened first, and the outlet 123 of the first packing box assembly 132 can be loosened to release the pressure of the water inrush. At this time, the second clamping mechanism 14 is less affected by the water pressure, and the second clamping mechanism 14 can be fully tightened (tightening the second connecting piece 143 makes the second clamping sleeve assembly 141 and the second packing box assembly 142 press against the junction of the freezing pipe 5 and the pressure reducing section 12). Due to the pressure reduction effect of the pressure reducing mechanism 1 in the water flow path, the water pressure borne by the first clamping mechanism 13 is much lower than the actual formation water pressure. At this time, tighten the first connecting piece 133 of the first clamping mechanism 13, close the outlet 123, and block the water inrush.

[0067] In the above structure, by setting a swirling outer cavity 122 in the pressure-reducing mechanism 1, ordinary or high-pressure water flow encounters greater resistance during its flow within the swirling outer cavity 122, effectively reducing the inrush pressure and thus improving the sealing effect. Furthermore, by setting the pressure-reducing mechanism 1, the first pressing mechanism 13, and the second pressing mechanism 14 to work together, the structure is simplified, operation is convenient, and the reliability of the seal is improved. It has a good pressure-reducing effect, effectively preventing water leakage at the borehole opening, reducing safety hazards caused by seal failure, and enhancing the overall safety and stability of the operation.

[0068] like Figure 2 and Figure 3 As shown, in a preferred embodiment, each cavity unit 100 is provided with a diverter 102. The diverter 102 is configured as a teardrop-shaped structure or a wave-shaped structure, with the tip of the teardrop-shaped diverter 102 facing the inlet 125. The diverter 102 is arranged coaxially with the cavity unit 100. The diverter 102 may be made of metal. When water flows into multiple cavity units 100 of the outer cavity in sequence, the diverter 102 divides the water flow into a straight channel and a swirling channel that is curved into a semi-circular shape. This weakens the kinetic energy of the water flow in the straight channel, achieves stable pressure reduction, and ensures the drilling operation of the freezing pipe 5.

[0069] like Figure 4 As shown, in a preferred embodiment, the first clamping sleeve assembly 131 includes a first sleeve 001 and a first flange 002. The first sleeve 001 is sleeved on the outer wall of the pipe body 11, and the first flange 002 is wrapped around the outer wall of the first sleeve 001 and welded to the first sleeve 001.

[0070] The first packing box assembly 132 includes a second sleeve 003, a second flange 004, and a first packing 005. The second sleeve 003 is fitted onto the outer wall of the pipe body 11 and the outer wall of the outlet 123. The first packing 005 is detachably disposed between the second sleeve 003 and the outer wall of the pipe body 11, and is located at the outlet 123. The first packing 005 is preferably a high-water-based packing, with at least four turns. The second flange 004 is wound around the second sleeve 003 near the outer wall of the outlet 123 and is welded to the second sleeve 003. The second flange 004 is located at the side end of the fifth flange 101 at the outlet 123.

[0071] Specifically, the first connector 133 connects the first flange 002 on the first sleeve 001, the second flange 004 on the second sleeve 003, and the fifth flange 101 on the outlet 123, so that the first sleeve 001 is pressed against the pipe body 11, one end of the second sleeve 003 is pressed against one end of the first sleeve 001, the middle section of the second sleeve 003 presses the first packing 005 against the outer wall of the pipe body 11, and the other end of the second sleeve 003 presses against the outer wall of the outlet 123. The first connector 133 can be loosened to replace the first packing 005 depending on its condition.

[0072] The first packing box assembly 132 and the first clamping sleeve assembly 131 work together to not only achieve clamping and sealing of the pipe body 11 and the outlet 123, but also improve the clamping and sealing effect.

[0073] like Figure 5 As shown, in a preferred embodiment, the second clamping sleeve assembly 141 includes a third sleeve 006 and a third flange 007. The third sleeve 006 is used to be sleeved on the freezing pipe 5, and the third flange 007 is wrapped around the outer wall of the third sleeve 006 and welded to the third sleeve 006.

[0074] The second packing box assembly 142 includes a fourth sleeve 008, a fourth flange 009, and a second packing 010. The fourth sleeve 008 is fitted onto the freezing pipe 5. The second packing 010 is detachably disposed between the fourth sleeve 008 and the freezing pipe 5. The second packing 010 is preferably a high-water-based packing, with at least four turns. The fourth flange 009 is wound around the outer wall of the fourth sleeve 008 and welded to the fourth sleeve 008. The fourth sleeve 008 and the end of the pressure-reducing part 12 near the through hole 124 are welded together, improving the sealing performance of the connection between the second pressing mechanism 14 and the pressure-reducing mechanism 1.

[0075] Specifically, the second connector 143 connects the third flange 007 on the third sleeve 006 and the fourth flange 009 on the fourth sleeve 008, so that the third sleeve 006 is pressed tightly against the freezing pipe 5, and one end of the fourth sleeve 008 is pressed tightly against one end of the third sleeve 006, while the other end of the fourth sleeve 008 presses the second packing 010 tightly against the outer wall of the freezing pipe 5. Depending on the usage condition of the second packing 010, the second connector 143 can be loosened to replace the second packing 010.

[0076] The second packing box assembly 142 and the second clamping sleeve assembly 141 work together to not only achieve the clamping and sealing of the junction of the freezing tube 5 and the pressure reducing mechanism 1, but also improve the clamping and sealing effect.

[0077] like Figure 1 As shown, this embodiment also provides a freezing pipe drilling device, including a borehole pipe 2, a first valve 3, and a borehole clamping and sealing device.

[0078] The orifice pipe 2 is used to fix itself within the opening of the lining 4, and a drain pipe 21 is inclinedly arranged on the side wall of the orifice pipe 2. A second valve 22 is provided at the end of the drain pipe 21 away from the orifice pipe 2, and the second valve 22 is used to open and close the drain pipe 21. The lining 4 is a lining 4 segment.

[0079] The inlet end of the first valve 3 is connected to the connection end of the orifice pipe 2 by fasteners, and is used to open and close the passage of the orifice pipe 2. The first valve 3 may preferably be a ball valve.

[0080] The end of the tube body 11 of the orifice compression sealing device away from the pressure reducing part 12 is connected to the outlet end of the first valve 3, for the freezing tube 5 to pass through and for guiding and reducing pressure.

[0081] In the above structure, a drain pipe 21 with a second valve 22 is inclinedly installed on the side wall of the orifice pipe 2. Combined with the pressure-reducing part 12 of the orifice clamping and sealing device, it achieves dual functions of drainage and pressure reduction. It can actively drain water from the hole through the drain pipe 21, and reduce the impact pressure of high-pressure water flow with the pressure-reducing part 12, effectively avoiding construction safety hazards caused by water leakage. This freezing pipe drilling device integrates the orifice pipe 2, the first valve 3, and the orifice clamping and sealing device. Its compact structure and convenient assembly and disassembly allow it to flexibly cope with different pressure water flow conditions, efficiently achieving flow diversion, pressure reduction, and sealing protection, ensuring the safety and reliability of the freezing pipe 5 drilling operation.

[0082] like Figure 1 As shown, this embodiment also provides a method for using a freezing pipe drilling device. Using the freezing pipe drilling device includes the following steps: S1-S4, and may also include S5.

[0083] S1: Fix the orifice pipe 2 inside the opening of the lining 4, and install the inlet end of the first valve 3 at the connecting end of the orifice pipe 2. A hole can be made in the lining 4 segment using a hole saw. After drilling to a certain depth, stop drilling, ram the orifice pipe 2 into the opening and fix it. Install the first valve 3 on the connecting end (e.g., the seventh flange) of the orifice pipe 2, open the first valve 3, and then use the hole saw to pass through the first valve 3 and the orifice pipe 2 to chisel through the tunnel lining 4. Remove the hole saw and close the first valve 3.

[0084] S2: When the first valve 3 is in the closed state, install the orifice clamping and sealing device at the outlet end of the first valve 3. At the outlet end of the first valve 3, install the orifice clamping and sealing device on the outlet end, and connect the eighth flange at the outlet end and the sixth flange 112 of the pipe body 11 with fasteners.

[0085] S3: Open the first valve 3, and pass the freezing pipe 5 sequentially through the second clamping mechanism 14, the pressure reducing mechanism 1, the first valve 3, and the orifice pipe 2 of the orifice clamping sealing device, and then proceed with drilling. Before drilling, tighten the first connecting piece 133 of the first clamping mechanism 13 and the second connecting piece 143 of the second clamping mechanism 14.

[0086] S4: During the drilling process of the freezing pipe 5, if water gushing below the first preset pressure is encountered, first tighten the second connecting piece 143 of the second pressing mechanism 14 of the hole opening pressing and sealing device, and then tighten the first connecting piece 133 of the first pressing mechanism 13, so as to press and seal the freezing pipe 5.

[0087] If a water inrush occurs at a pressure higher than the second preset pressure, first loosen the first connector 133 of the first clamping mechanism 13 to open the outlet water 123. At the same time, open the second valve 22 on the drain pipe 21 of the orifice pipe 2. The water inrush will be depressurized through the drain pipe 21 on the orifice pipe 2 and the outlet 123 of the pressure reducing part 12. After depressurization, the second clamping mechanism 14 is less affected by the water pressure. The second clamping mechanism 14 can be fully tightened first, and then the second valve 22 on the drain pipe 21 can be closed. Due to the pressure reducing effect of the pressure reducing mechanism 1 in the water flow path, the water pressure borne by the first clamping mechanism 13 is much lower than the actual formation water pressure. At this time, tighten the first connector 133 of the first clamping mechanism 13, close the outlet 123, and block the water inrush.

[0088] It may also include, S5: Grouting is performed from the second valve 22 of the orifice pipe 2 into the annular space between the orifice pipe 2 and the freezing pipe 5. After the grout solidifies, the first connector 133 and the second connector 143 can be loosened, and the first packing 005 and the second packing 010 can be replaced. After the replacement is completed, the first connector 133 and the second connector 143 are tightened again, and the freezing pipe 5 continues to perform drilling operations.

[0089] The above methods can flexibly cope with different pressure water inrush conditions, efficiently achieve diversion and pressure reduction and sealing protection, and ensure the safety and reliability of the drilling construction of the freezing pipe 5.

[0090] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A hole-sealing device for pressing and sealing the hole of a frozen pipe (5), characterized in that, include: A pressure reducing mechanism (1) is provided, comprising a connected pipe body (11) and a pressure reducing part (12). The pipe body (11) is provided with a first inner cavity (111) through which the freezing pipe (5) passes. The pressure reducing part (12) includes a second inner cavity (121) through which the freezing pipe (5) passes and a swirling outer cavity (122) for guiding and reducing pressure. The swirling outer cavity (122) is located outside the second inner cavity (121). One end of the second inner cavity (121) is connected to the first inner cavity (111), and the other end of the second inner cavity (121) is connected to the swirling outer cavity (122). The swirling outer cavity (122) is provided with an outlet (123) near the pipe body (11). The pressure reducing part (12) is provided with a through hole (124) through which the freezing pipe (5) passes at the end away from the pipe body (11). The first pressing mechanism (13) is sleeved on the outer wall of the pipe body (11) and the outlet (123) for pressing the outlet (123); The second pressing mechanism (14) is located at the end of the pressure reducing part (12) away from the tube body (11) and is used to be sleeved on the freezing tube (5) to press the junction of the freezing tube (5) and the pressure reducing mechanism (1).

2. The orifice pressing and sealing device as described in claim 1, characterized in that, The two swirling outer cavities (122) are configured, and the two swirling outer cavities (122) are respectively located on both sides of the water flow direction of the second inner cavity (121); and / or, The swirling outer cavity (122) includes multiple cavity units (100) arranged along the water flow direction, with adjacent cavity units (100) connected to each other, so that the swirling outer cavity (122) forms a swirling channel; and / or, The outlet (123) is an outwardly sloping opening; and / or, The outer wall of the outlet (123) is annular, and a fifth flange (101) is provided around the outer wall of the outlet (123); and / or, The outer vortex cavity (122) is provided with a water inlet (125), which is close to the through hole (124) and communicates with the second inner cavity (121); and / or, A sixth flange (112) is wound around the outer wall of the end of the pipe body (11) away from the pressure reducing part (12); and / or, The first pressing mechanism (13), the decompression mechanism (1), and the second pressing mechanism (14) are located on the same axis.

3. The orifice pressing and sealing device as described in claim 2, characterized in that, The cavity unit (100) is a teardrop-shaped cavity or a wave-shaped cavity, with the tip of the cavity unit (100) facing the inlet (125) and the rounded end of the cavity unit (100) facing the outlet (123); and / or, Each cavity unit (100) is provided with a flow divider (102).

4. The orifice pressing and sealing device as described in claim 3, characterized in that, The diverter (102) has a teardrop-shaped or wave-shaped structure, with the tip of the teardrop-shaped structure facing the inlet (125); and / or, The diverter (102) is arranged coaxially with the cavity unit (100).

5. The orifice pressing and sealing device as described in claim 1, characterized in that, The first clamping mechanism (13) includes a first clamping sleeve assembly (131), a first packing box assembly (132), and a plurality of first connectors (133). The first clamping sleeve assembly (131) is sleeved on the outer wall of the pipe body (11), and the first packing box assembly (132) is sleeved on the outer wall of the pipe body (11) and the outer wall of the outlet (123). One end of the first packing box assembly (132) is pressed against the outer wall of one end of the first clamping sleeve assembly (131). The first clamping sleeve assembly (131) and the first packing box assembly (132) are connected by a plurality of first connectors (133); and / or, The second clamping mechanism (14) includes a second clamping sleeve assembly (141), a second packing box assembly (142), and a plurality of second connectors (143). The second packing box assembly (142) and the second clamping sleeve assembly (141) are used to be sleeved on the freezing tube (5) located outside the pressure reducing part (12). One end of the second packing box assembly (142) is connected to the end of the pressure reducing part (12) away from the tube body (11). The other end of the second packing box assembly (142) is pressed against the outer wall of one end of the second clamping sleeve assembly (141). The second packing box assembly (142) and the second clamping sleeve are connected by a plurality of second connectors (143).

6. The orifice pressing and sealing device as described in claim 5, characterized in that, The first clamping sleeve assembly (131) includes a first sleeve (001) and a first flange (002), the first sleeve (001) being sleeved on the outer wall of the pipe body (11), and the first flange (002) being wound around the outer wall of the first sleeve (001); and / or, The first packing box assembly (132) includes a second sleeve (003), a second flange (004), and a first packing (005). The second sleeve (003) is sleeved on the outer wall of the pipe body (11) and the outer wall of the outlet (123). The first packing (005) is detachably disposed between the second sleeve (003) and the outer wall of the pipe body (11). The second flange (004) is wound around the outer wall of the second sleeve (003); and / or, The second clamping sleeve assembly (141) includes a third sleeve (006) and a third flange (007), the third sleeve (006) being fitted onto the freezing pipe (5), and the third flange (007) being wound around the outer wall of the third sleeve (006); and / or, The second packing box assembly (142) includes a fourth sleeve (008), a fourth flange (009), and a second packing (010). The fourth sleeve (008) is used to be sleeved on the freezing pipe (5). The second packing (010) is detachably disposed between the fourth sleeve (008) and the freezing pipe (5). The fourth flange (009) is wrapped around the outer wall of the fourth sleeve (008).

7. The orifice pressing and sealing device as described in claim 6, characterized in that, The fourth sleeve (008) and the pressure reducing part (12) are welded together at one end near the through hole (124).

8. A drilling device for freezing pipes, characterized in that, include: The orifice pipe (2) is used to be fixed in the opening of the lining (4), and the side wall of the orifice pipe (2) is inclinedly provided with a drainage pipe (21); The first valve (3) is connected to the connecting end of the orifice pipe (2) at its inlet end, and is used to open and close the channel of the orifice pipe (2). The orifice pressing and sealing device as described in any one of claims 1-7, wherein the end of the tube body (11) of the orifice pressing and sealing device away from the pressure reducing part (12) is connected to the outlet end of the first valve (3) for the freezing tube (5) to pass through and for guiding and reducing pressure.

9. The freezing pipe drilling device as described in claim 8, characterized in that, A second valve (22) is provided at the end of the drain pipe (21) away from the orifice pipe (2), the second valve (22) being used to open and close the drain pipe (21); and / or, The lining (4) is a lining (4) segment; and / or; The first valve (3) is a ball valve.

10. A method of using a freezing pipe drilling device, comprising using the freezing pipe drilling device according to claim 8 or 9, characterized in that, Includes the following steps: S1: Fix the orifice pipe (2) in the opening of the lining (4) and install the inlet end of the first valve (3) on the connection end of the orifice pipe (2); S2: When the first valve (3) is in the closed state, the orifice clamping sealing device is installed at the outlet end of the first valve (3); S3: Open the first valve (3), and pass the freezing tube (5) through the second pressing mechanism (14), pressure reducing mechanism (1), first valve (3) and orifice tube (2) of the orifice pressing sealing device in sequence, and then drill; S4: During the drilling process of the freezing pipe (5), if water gushing below the first preset pressure is encountered, the second pressing mechanism (14) and the first pressing mechanism (13) of the operating orifice pressing and sealing device are used to press and seal the freezing pipe (5). If the water pressure exceeds the second preset pressure, loosen the first clamping mechanism (13) and open the drain pipe (21). The drain pipe (21) on the orifice pipe (2) and the outlet (123) of the pressure reducing part (12) depressurize the water. After depressurization, operate the second clamping mechanism (14) to press and seal the freezing pipe (5). Then close the drain pipe (21) and the first clamping mechanism (13) to block the water.

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