Freezing device for avoiding air blockage at tail end of pipe in freezing construction

Abstract

The invention discloses a freezing device for avoiding air blockage at the tail end of a pipe in freezing construction, which comprises a liquid supply pipe and a freezing pipe, the liquid supply pipe is inserted into the freezing pipe from the pipe orifice of the freezing pipe and extends to the pipe bottom of the freezing pipe, and the liquid supply pipe is communicated with the freezing pipe through fluid; the freezing device further comprises a tail end partition plate and a saline water channel pipe, the tail end partition plate is installed on the portion, inserted into the freezing pipe, of the liquid supply pipe, and the outer circumferential face of the tail end partition plate is matched with the inner wall of the freezing pipe in a sealed mode. By means of the specific structural design, it is ensured that low-temperature saline water can fully fill the whole freezing pipe, especially the tail end of the pipe, the gas blocking phenomenon is avoided, and the effective freezing distance and the freezing effect of the freezing pipe are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of artificial ground freezing construction, and more particularly to a freezing device for avoiding air blockage at the end of a pipe during freezing construction. Background Art

[0002] Artificial ground freezing method uses artificial refrigeration technology to convert natural water-containing rock and soil into artificial frozen soil by circulating low-temperature brine in freezing pipes; thereby greatly improving the strength and stability of the original stratum, forming a continuous frozen wall that can resist rock and soil pressure and effectively isolate groundwater, which is a special stratum reinforcement technology used as a support for construction activities.

[0003] In freezing construction, the freezing pipe is often designed at an elevation angle. The way the low-temperature brine circulates in the freezing pipe is that the low-temperature brine flows in from the liquid supply pipe and flows out through the annular space between the liquid supply pipe and the freezing pipe. Figure 1 and Figure 2 As shown, since the length of the liquid supply pipe is slightly smaller than the length of the freezing pipe in actual construction, under the influence of gravity, the low-temperature brine at the end of the freezing pipe cannot fill the entire freezing pipe and circulates out from the annular space. Therefore, "air blockage" often occurs, resulting in a reduction in the effective freezing distance of the freezing pipe, a reduction in the freezing effect, and even a construction risk that the soil at the end of the freezing pipe is not frozen. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a freezing device that avoids air blockage at the end of the pipe during freezing construction. The present invention ensures that low-temperature brine can fully fill the entire freezing pipe through a specific structural design, especially at the end of the pipe, avoiding the "air blockage" phenomenon and ensuring the effective freezing distance and freezing effect of the freezing pipe. The freezing pipe is simple in design, easy to install and maintain, and can significantly improve construction efficiency and safety, and reduce construction risks and maintenance costs.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A freezing device for avoiding air blockage at the end of a pipe during freezing construction, comprising a liquid supply pipe and a freezing pipe, wherein the liquid supply pipe is inserted into the freezing pipe from the pipe opening of the freezing pipe and extends to the pipe bottom of the freezing pipe, and the liquid supply pipe is in fluid communication with the freezing pipe;

[0007] The freezing device also includes an end baffle and a brine channel tube, wherein the end baffle is installed on the portion of the liquid supply tube inserted into the freezing tube, and the outer circumferential surface of the end baffle is sealed with the inner wall of the freezing tube; the end baffle divides the space in the freezing tube into two independent spaces, the space between the bottom of the freezing tube and the end baffle is the end cavity, and the space between the pipe mouth of the freezing tube and the end baffle is the annular space;

[0008] The end partition is provided with a first through hole and a second through hole, wherein the liquid supply pipe passes through the second through hole, and the water outlet of the liquid supply pipe is located in the end cavity and is fluidly connected with the end cavity; the saline channel tube passes through the first through hole, and both ends of the saline channel tube are fluidly connected with the annular space and the end cavity, respectively.

[0009] In the freezing device, the brine channel tube is a flexible hose, and the length of the brine channel tube is greater than the distance between the water outlet of the liquid supply tube and the bottom of the freezing tube; a foam block is bonded to the outer wall of the water inlet end of the brine channel tube and the terminal cavity fluid conduction; from the time when the low-temperature brine starts to flow into the terminal cavity from the water outlet of the liquid supply tube until the low-temperature brine fills the terminal cavity, the foam block drives the water inlet end pipe mouth of the brine channel tube to float in the terminal cavity, so that the water inlet end pipe mouth of the brine channel tube remains above the liquid level of the low-temperature brine. When the low-temperature brine flows from the liquid supply tube into the terminal cavity, the air can be discharged smoothly through the brine channel tube, thereby avoiding the air blockage phenomenon and ensuring the effective freezing distance and freezing effect of the freezing tube.

[0010] In the above-mentioned freezing device, a sealing ring is provided between the outer circumferential surface of the end partition and the inner wall of the freezing pipe.

[0011] In the freezing device, the sealing ring is a water-expandable rubber ring. The water-expandable rubber ring arranged between the end baffle and the inner wall of the tube body can expand rapidly after the low-temperature salt water enters the tube cavity to form a sealed connection, which is conducive to the discharge of gas in the end cavity and prevents gas blockage in the end cavity, which affects the freezing effect of the end of the freezing tube. At the same time, when the end baffle is installed in the freezing tube, the water-expandable rubber ring is in an unexpanded state, which facilitates the end baffle to move to a suitable position in the tube cavity of the freezing tube.

[0012] In the freezing device, the outlet of the liquid supply pipe is an oblique cut, and the oblique cut on the liquid supply pipe is arranged downward. When the liquid supply pipe is an oblique cut, it can be more convenient to extend into the second through hole on the end partition 1 when assembling the freezing device.

[0013] In the freezing device, the number of the brine channel tubes is greater than or equal to 3, and the first through holes are evenly arranged on the periphery of the second through holes. When the first through holes are evenly arranged on the periphery of the second through holes, the air in the terminal cavity can be discharged regardless of the installation angle of the terminal baffle inside the freezing tube.

[0014] For the above-mentioned freezing device, when the freezing device is installed in the freezing hole at an upward angle, the first through hole is arranged above the second through hole.

[0015] In the freezing device, the number of the second through hole is 1, and the sum of the cross-sectional areas of the first through holes is less than or equal to the cross-sectional area of ​​the second through hole. The sum of the cross-sectional areas of the first through holes is less than or equal to the cross-sectional area of ​​the second through hole, which is conducive to the discharge of gas in the terminal cavity.

[0016] In the freezing device, a water outlet hole is opened on the wall of the freezing pipe, and the water outlet hole is adjacent to the pipe opening of the freezing pipe.

[0017] The above-mentioned freezing device also includes a discharge joint and a return joint, the discharge joint is fixedly connected at the pipe mouth of the freezing pipe and is in fluid communication with the lumen of the liquid supply pipe, and the return joint is fixedly connected at the water outlet of the freezing pipe and is in fluid communication with the lumen of the freezing pipe.

[0018] The technical solution of the present invention achieves the following beneficial technical effects:

[0019] 1. The freezing device ensures that the low-temperature brine can fully fill the freezing pipe, especially the end area of ​​the pipe, through the coordinated design of the liquid supply pipe, the end baffle and the brine channel pipe. The liquid supply pipe directly delivers the low-temperature brine to the end cavity at the bottom of the freezing pipe, and the end baffle divides the cavity into two independent spaces, ensuring that the air in the end cavity is discharged through the brine channel pipe, avoiding air blockage. This design solves the problem that the low-temperature brine in the traditional freezing pipe cannot fill the end, ensures the effective freezing length of the entire freezing pipe, and improves the construction efficiency and freezing effect.

[0020] 2. The bevel design of the outlet of the liquid supply pipe effectively reduces the impact of the outflow of low-temperature brine, avoids turbulence in the terminal cavity, and prevents the foam block from being disturbed when floating. The downward bevel cut can prevent embolism in the brine channel pipe to a certain extent, ensuring the efficiency of exhaust. This structural design reduces repeated operations caused by air blockage or construction interruption, and significantly improves construction efficiency and safety.

[0021] 3. The brine channel pipe is arranged adjacent to the wall of the freezing pipe. This layout design allows the low-temperature brine to flow more evenly in the freezing pipe. After the low-temperature brine is delivered to the terminal cavity through the liquid supply pipe, the brine will flow back into the annular space along the brine channel pipe and contact the freezing pipe wall, thereby fully cooling the soil around the freezing pipe. This uniform surrounding layout ensures the freezing effect of the freezing pipe, especially for scenes where a complete freezing wall needs to be formed, which can increase the freezing speed and ensure the continuity of the freezing wall.

[0022] 4. The freezing pipe structure of the present invention is relatively simple, and the connection and installation between the components are convenient and quick. In addition, through reasonable layout and design, the freezing pipe is easy to maintain and repair during use, reducing maintenance costs and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a freezing pipe in the prior art;

[0024] Figure 2 A schematic diagram of a freezing pipe in the prior art when in use;

[0025] Figure 3 A schematic diagram of the internal structure of a freezing tube in Example 1 of the present invention;

[0026] Figure 4 A schematic diagram of the structure of the end baffle in Example 1 of the present invention;

[0027] Figure 5 A schematic diagram of the structure of the saline channel tube, the foam block and the end baffle after being assembled in Example 1 of the present invention;

[0028] Figure 6 A schematic diagram of the internal state of the freezing pipe when low-temperature brine is filled into the annular space of the freezing pipe in Example 1 of the present invention;

[0029] Figure 7 A schematic diagram of the positional relationship between the first through hole and the second through hole in Embodiment 2 of the present invention;

[0030] Figure 8 A partial enlarged view of the terminal cavity in Example 1 of the present invention.

[0031] The reference numerals in the figure are as follows: 1-end partition; 101-first through hole; 102-second through hole; 2-water-swellable rubber ring; 3-brine channel tube; 4-foam block; 5-liquid supply tube; 6-freezing tube; 601-bottom wall of freezing tube; 602-annular space; 603-end cavity; 7-outlet connector; 8-return connector. DETAILED DESCRIPTION

[0032] Example 1

[0033] like Figure 3 As shown, in this embodiment, a freezing device is provided to avoid gas blockage at the end of a pipe during freezing construction, comprising a liquid supply pipe 5, a freezing pipe 6, an end baffle 1, a brine channel pipe 3, a discharge joint 7 and a return joint 8. The liquid supply pipe 5 is inserted into the freezing pipe 6 from the pipe mouth of the freezing pipe 6 and extends to the bottom of the freezing pipe 6, and the liquid supply pipe 5 is in fluid communication with the freezing pipe 6.

[0034] The end baffle 1 is installed on the portion of the liquid supply pipe 5 inserted into the freezing pipe 6, and a water-expandable rubber ring 2 is provided on the outer circumferential surface of the end baffle 1. When the freezing pipe is in use, the tube cavity will be filled with freezing liquid (low-temperature salt water), and the water-expandable rubber ring 2 absorbs the freezing liquid and expands, and the outer circumferential surface of the end baffle 1 is sealed with the inner wall of the freezing pipe 6.

[0035] The end partition 1 divides the space inside the freezing pipe 6 into two independent spaces. The space between the bottom of the freezing pipe 6 and the end partition 1 is the end cavity 603, and the space between the pipe opening of the freezing pipe 6 and the end partition 1 is the annular space 602. Figure 3 shown.

[0036] like Figure 4 As shown, the terminal partition plate 1 is provided with a first through hole 101 and a second through hole 102, wherein the liquid supply pipe 5 passes through the second through hole 102, and the water outlet of the liquid supply pipe 5 is located in the terminal cavity 603 and is fluidly connected to the terminal cavity 603; the brine channel tube 3 passes through the first through hole 101, the water outlet of the brine channel tube 3 is fluidly connected to the annular space 602, and the water inlet end of the brine channel tube 3 is fluidly connected to the terminal cavity 603.

[0037] The water outlet of the liquid supply pipe 5 is an oblique cut. When the freezing device is installed in the freezing hole at an upward angle, the oblique cut (water outlet) on the liquid supply pipe 5 faces downward.

[0038] The brine channel tubes 3 in this embodiment have a total of 6 freezing tubes and 1 liquid supply tube 5. On the end partition 1, the first through hole 101 through which the brine channel tube 3 passes is uniformly surrounded by the outer periphery of the second through hole 102 through which the liquid supply tube 5 passes.

[0039] A water outlet hole is provided on the wall of the freezing pipe 6, and the water outlet hole is adjacent to the pipe mouth of the freezing pipe. The outgoing joint 7 is fixedly connected to the pipe mouth of the freezing pipe 6 and is in fluid communication with the lumen of the liquid supply pipe 5, and the return joint 8 is fixedly connected to the water outlet hole of the freezing pipe 6 and is in fluid communication with the lumen of the freezing pipe 6.

[0040] The salt water channel pipe 3 is a flexible hose, and the length of the salt water channel pipe 3 is greater than the distance from the outlet of the liquid supply pipe 5 to the bottom of the freezing pipe 6 (i.e. Figure 3 The distance between the bottom wall 601 of the freezing pipe and the outlet of the liquid supply pipe 5 is greater than 0. The water inlet end of the brine channel pipe 3 is bonded with a foam block 4, such as Figure 5 shown.

[0041] The freezing pipe in this embodiment is installed in the freezing hole located underground at an elevation angle when in use. The low-temperature brine flows into the terminal cavity 603 from the water outlet of the liquid supply pipe 5 and contacts the water-expandable rubber ring 2 on the outer circumferential surface of the terminal partition 1. The water-expandable rubber ring 2 absorbs the low-temperature brine and expands, isolating the terminal cavity 603 from the annular space 602. When there is no low-temperature brine in the terminal cavity 603, the water inlet end of the brine channel pipe 3 naturally sags. As the low-temperature brine gradually fills the terminal cavity 603, the foam block 4 bonded to the outer wall of the water inlet end of the brine channel pipe 3 floats on the water surface of the low-temperature brine, so that the water inlet end pipe opening of the brine channel pipe 3 remains above the water surface of the low-temperature brine, and the air above the water surface is discharged from the terminal cavity 603 through the brine channel pipe 3 and enters the annular space 602. Until the terminal cavity 603 is filled with low-temperature brine, the water inlet end pipe opening of the brine channel pipe 3 will be submerged below the water surface of the low-temperature brine, and then the low-temperature brine will continue to flow into the annular space through the brine channel pipe 3.

[0042] like Figure 8 As shown, the water outlet of the liquid supply pipe 5 is an oblique cut, and the oblique cut is set downward, and the bevel angle α of the oblique cut is 30°. Compared with a flat cut, when the water outlet of the liquid supply pipe 5 is an oblique cut, the liquid supply pipe 5 will be more easily assembled with the terminal partition 1. And under the condition that the flow rate of the low-temperature brine is the same, when the oblique cut is downward, the brine flowing out of the liquid supply pipe 5 has a smaller impact on the low-temperature brine in the terminal cavity 603 and the bottom wall 601 of the freezing pipe, which can reduce the turbulence of the low-temperature brine in the terminal cavity 603 to a certain extent, and reduce the interference of the turbulence on the floating of the foam block 4. If the oblique cut is upward, the low-temperature brine flowing out of the liquid supply pipe 5 will flow upward, disturbing the water surface of the low-temperature brine, which may cause a small part of the low-temperature brine to enter the brine channel tube, causing embolism in the brine channel tube, affecting the exhaust effect.

[0043] When the freezing device is installed in the freezing hole at an upward angle, the water outlets of the salt water channel tubes 3 are evenly distributed at the top of the annular space 602. After the gas in the terminal cavity 603 is exhausted, low-temperature salt water flows into the annular space 602 from multiple salt water channel tubes 3 simultaneously, so that the annular space 602 is quickly filled with low-temperature salt water (such as Figure 6 This is conducive to obtaining a better freezing effect.

[0044] In the process of the annular space 602 gradually being filled with low-temperature brine, most of the air in the annular space 602 will be discharged from the annular space along with the low-temperature brine in the form of bubbles (a small amount of air may remain in the annular space 602, but it is not enough to affect the freezing effect). The flow rate and pressure of the low-temperature brine when it flows into the annular space 602 are relatively high, and it will accumulate on one side of the annular space 602 near the outlet joint 7. In this way, there is a large amount of low-temperature brine at both ends of the freezing pipe 6, and the cold at the ends is quickly transferred to the middle of the freezing pipe, which is conducive to the rapid formation of a stable freezing wall around the freezing pipe.

[0045] The freezing pipe in this embodiment is installed according to the following method: after the freezing hole is drilled, the freezing pipe 6 is assembled into the required length by simple welding or threaded connection; then the end partition 1 is fixedly connected to the liquid supply pipe 5, a water-swellable rubber ring 2 is put on the edge of the end partition 1, a foam block 4 is pasted at the water inlet end of the brine channel tube 3, and then the brine channel tube 3 is placed in the first through hole 101, and finally the end partition 1, the brine channel tube 3 and the liquid supply pipe 5 are inserted into the freezing pipe 6 together, the position of the liquid supply pipe 5 (that is, the length of the liquid supply pipe 5 extending into the tube cavity of the freezing pipe 6) is adjusted, the outlet joint 7 is connected to the liquid supply pipe 5, and the outlet joint 7 and the return joint 8 are welded to the outer wall of the freezing pipe 6.

[0046] In this embodiment, the through holes on the end partition 1 are designed as "a large central hole (i.e., the second through hole 102) and a number of small holes (i.e., the first through hole 101) evenly arranged around the large central hole", so that the end partition 1 does not need to be rotated and the angle adjusted when it is installed in the tube cavity of the freezing tube 6, and the installation is more convenient and quick. And in this embodiment, the sum of the cross-sectional areas of the first through holes 101 is smaller than that of the second through holes 102, which makes the exhaust speed in the end cavity 603 faster and the exhaust effect better. In some other embodiments, the sum of the cross-sectional areas of the first through holes 101 should be less than or equal to the cross-sectional area of ​​the second through holes 102.

[0047] Example 2

[0048] The freezing pipe in this embodiment is installed in the freezing hole at an upward angle. The difference between this embodiment and embodiment 1 is that, on the end partition 1, the first through hole 101 through which the brine channel pipe 3 passes is located above the second through hole 102 through which the liquid supply pipe 5 passes, and the first through hole 101 is closer to the ground. Figure 7 At this time, the saline channel tube 3 can still play a good role in exhausting the air in the terminal cavity 603.

[0049] However, compared with Example 1, when installing the freezing pipe in this embodiment, it is necessary to pay attention to adjusting the rotation angle of the end partition 1 in the freezing pipe 6, so that when the installation is completed, the water inlet end of the brine channel pipe 3 is located above the water outlet of the liquid supply pipe 5 (that is, the water inlet end of the brine channel pipe 3 is closer to the ground than the water outlet of the liquid supply pipe 5).

[0050] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A freezing device for avoiding air blockage at the end of a pipe during freezing construction, comprising a liquid supply pipe (5) and a freezing pipe (6), wherein the liquid supply pipe (5) is inserted into the freezing pipe (6) from the pipe mouth of the freezing pipe (6) and extends to the bottom of the freezing pipe (6), and the liquid supply pipe (5) is in fluid communication with the freezing pipe (6); It is characterized in that The freezing device further comprises an end baffle (1) and a brine channel tube (3); the end baffle (1) is mounted on the portion of the liquid supply tube (5) inserted into the freezing tube (6); the outer circumferential surface of the end baffle (1) is in sealing cooperation with the inner wall of the freezing tube (6); the end baffle (1) divides the space inside the freezing tube (6) into two independent spaces; the space between the bottom of the freezing tube (6) and the end baffle (1) is the end cavity (603); and the space between the tube mouth of the freezing tube (6) and the end baffle (1) is the annular space (602); The end partition plate (1) is provided with a first through hole (101) and a second through hole (102), wherein the liquid supply pipe (5) passes through the second through hole (102), and the water outlet of the liquid supply pipe (5) is located in the end cavity (603) and is fluidly connected to the end cavity (603); the brine channel pipe (3) passes through the first through hole (101), and the two ends of the brine channel pipe (3) are fluidly connected to the annular space (602) and the end cavity (603), respectively.

2. The freezing device according to claim 1, characterized in that: The brine channel tube (3) is a flexible hose, and the length of the brine channel tube (3) is greater than the distance between the water outlet of the liquid supply tube (5) and the bottom of the freezing tube (6); a foam block (4) is bonded to the outside of the water inlet end wall of the brine channel tube (3) and the terminal cavity (603) for fluid communication; from the time when low-temperature brine starts to flow into the terminal cavity (603) from the water outlet of the liquid supply tube (5) until the low-temperature brine fills the terminal cavity (603), the foam block (4) drives the water inlet end pipe opening of the brine channel tube (3) to float in the terminal cavity (603), so that the water inlet end pipe opening of the brine channel tube (3) is kept above the liquid surface of the low-temperature brine.

3. The freezing device according to claim 1, characterized in that: A sealing ring is provided between the outer circumferential surface of the end partition plate (1) and the inner wall of the freezing pipe (6).

4. The freezing device according to claim 3, characterized in that: The sealing ring is a water-swellable rubber ring (2).

5. The freezing device according to claim 1, characterized in that: The water outlet of the liquid supply pipe (5) is an oblique cut, and the oblique cut on the liquid supply pipe (5) is arranged downward.

6. The freezing device according to claim 1, characterized in that: The number of the saline channel tubes (3) is greater than or equal to 3, and the first through holes (101) are evenly arranged on the periphery of the second through holes (102).

7. The freezing device according to claim 1, characterized in that: When the freezing device is installed in the freezing hole at an upward angle, the first through hole (101) is arranged above the second through hole (102).

8. The freezing device according to any one of claims 1 to 7, characterized in that: The number of the second through hole (102) is one, and the sum of the cross-sectional areas of the first through holes (101) is less than or equal to the cross-sectional area of ​​the second through hole (102).

9. The freezing device according to claim 8, characterized in that A water outlet hole is opened on the pipe wall of the freezing pipe (6), and the water outlet hole is adjacent to the pipe opening of the freezing pipe.

10. The freezing device according to claim 9, characterized in that The freezing device also includes a forward connector (7) and a reverse connector (8), wherein the forward connector (7) is fixedly connected to the outlet of the freezing pipe (6) and is in fluid communication with the lumen of the liquid supply pipe (5), and the reverse connector (8) is fixedly connected to the water outlet of the freezing pipe (6) and is in fluid communication with the lumen of the freezing pipe (6).

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