Freezing hole plugging structure

Abstract

The utility model discloses a freezing hole plugging structure which comprises a first plugging structure, a second plugging structure and a temperature measuring device. The first plugging structure and the second plugging structure are sequentially arranged at a freezing hole between the cut-off position of a freezing pipe in the segment and the inner wall of the segment from the outer side to the inner side, and the measuring end of the temperature measuring device is arranged in the first plugging structure; the first plugging structure comprises first concrete and a first plugging plate; the second plugging structure comprises second concrete and a second plugging plate; the measuring end of the temperature measuring device is arranged in the first concrete. The two plugging structures are matched, so that the plugging tightness and firmness can be improved, the plugging effect is ensured, and the freezing liquid is prevented from leaking; and meanwhile, the arranged temperature measuring device can monitor the temperature change condition of the frozen soil body outside the first concrete by monitoring the temperature change of the first concrete, so that the freezing effect is monitored, the quality state of the frozen soil body can be known in time, and the safety of the construction process is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of freezing hole blocking, in particular to a freezing hole blocking structure. Background Art

[0002] During the construction of tunnel projects, horizontal tunnels cannot do without the silent support of pipe segments. With the gradual development of underground projects in my country, pipe segments are used more and more widely in construction. However, due to the presence of groundwater during construction, it will pose a safety threat to the construction. Therefore, it is necessary to use the freezing method for reinforcement when carrying out underground construction in some water-rich areas. The freezing reinforcement technology is widely used in dealing with accidents involving water-containing, loose and unstable strata in underground engineering construction due to its good waterproof effect and little impact on the surrounding environment.

[0003] Freezing reinforcement utilizes artificial refrigeration technology. By drilling through the inner wall of the segment to the outer soil layer, a freezing liquid is injected into the outer soil layer, freezing the water in the stratum. This transforms the loose, water-bearing rock and soil into frozen soil, increasing its strength and stability while isolating groundwater. This technology creates a closed frozen soil structure (a frozen soil curtain), effectively preventing threats to project safety caused by the presence of groundwater.

[0004] After the freeze reinforcement work is completed, the frozen holes should be promptly sealed and the pipe segments repaired due to the need to continue construction. However, due to the large workload and multiple overlapping processes, this step has led to many failures and inability to effectively seal the frozen holes. Furthermore, after the frozen holes are sealed, it is impossible to monitor the freezing quality of the frozen stratum, resulting in safety hazards during the construction process and hindering the smooth progress of construction. Utility Model Content

[0005] The utility model provides a freezing hole blocking structure to overcome the above problems.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A freezing hole blocking structure comprises a first blocking structure, a second blocking structure and a temperature measuring device;

[0008] The first blocking structure and the second blocking structure are sequentially arranged from the outside to the inside at the freezing hole between the freezing pipe cutoff point and the inner wall of the pipe segment inside the pipe segment, and the measuring end of the temperature measuring device is arranged inside the first blocking structure;

[0009] The first plugging structure includes a first concrete filled in the freezing pipe and a first plugging plate fixed at the cutoff of the freezing pipe; the second plugging structure includes a second concrete filled in the freezing hole and arranged on the inner side of the first plugging steel plate, and a second plugging plate arranged on the inner side of the second concrete and fixed on the inner wall of the pipe segment;

[0010] The measuring end of the temperature measuring device is arranged inside the first concrete.

[0011] Furthermore, the temperature measuring device is a thermocouple.

[0012] Furthermore, channels are provided on the second blocking plate, inside the second concrete, on the first blocking plate, and inside the first concrete. The channels are connected to form a mounting hole, and the temperature measuring device is provided in the mounting hole.

[0013] Furthermore, the first blocking plate is a steel plate, and the first blocking plate is welded to the cut-off portion of the freezing pipe.

[0014] Furthermore, both sides of the first blocking plate are fixed to the pipe segment by expansion bolts.

[0015] Furthermore, the second blocking plate is a steel plate, and the second blocking plate is fixed to the inner wall of the segment by anchor bolts.

[0016] Furthermore, a sealant is applied to the welding joint between the first blocking plate and the freezing pipe.

[0017] Furthermore, a sealing material is filled between the second sealing plate and the inner wall of the tube segment.

[0018] Furthermore, the first concrete is concrete with a strength of C20 or above; and the second concrete is slightly expansive concrete.

[0019] The beneficial effects of the utility model are:

[0020] The utility model discloses a freezing hole plugging structure, which adopts two sealing structures to cooperate with each other to improve the tightness and firmness of the plugging, ensure the sealing effect, and thus prevent the leakage of the frozen liquid; at the same time, the temperature measuring device provided can monitor the temperature change of the frozen soil outside the first concrete by monitoring the temperature change of the first concrete, and then monitor the freezing effect, and can timely know the quality status of the frozen soil, avoiding the problem of not being able to obtain the freezing status of the frozen soil outside the pipe segment after the freezing hole is sealed. This structure can realize the sealing of the freezing hole and ensure the tightness of the plugging, and can also realize the monitoring of the frozen soil status, ensure the freezing quality, and thus ensure the safety of the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is a schematic diagram of a freezing hole blocking structure disclosed in an embodiment of the present utility model;

[0023] Figure 2 It is a structural schematic diagram of a freezing hole plugging structure disclosed in an embodiment of the utility model after the freezing pipe part is cut off.

[0024] In the picture:

[0025] 1. First blocking structure; 11. First concrete; 12. First blocking plate; 13. Expansion bolt;

[0026] 2. Second blocking structure; 21. Second concrete; 22. Second blocking plate; 23. Anchor bolt;

[0027] 3. Temperature measuring device;

[0028] 4. Segments;

[0029] 5. The cut-off point of the freezing pipe;

[0030] 6. Inner wall of segment;

[0031] 7. Freeze hole;

[0032] 8. Freeze pipe;

[0033] 9. Mounting hole. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] Example:

[0036] like Figure 1-2 The figure shows a freezing hole blocking structure provided by this embodiment, comprising a first blocking structure 1, a second blocking structure 2 and a temperature measuring device 3;

[0037] The first blocking structure and the second blocking structure are sequentially arranged from the outside to the inside at the freezing hole 7 between the freezing pipe cutoff 5 and the inner wall 6 of the pipe segment 4, and the measuring end of the temperature measuring device 3 is arranged inside the first blocking structure;

[0038] The first plugging structure 1 includes a first concrete 11 filled in the freezing pipe 8 and a first plugging plate 12 fixed to the freezing pipe cutoff 5; the second plugging structure 2 includes a second concrete 21 filled in the freezing hole 7 and arranged on the inner side of the first plugging steel plate, and a second plugging plate 22 arranged on the inner side of the second concrete and fixed to the inner wall 6 of the pipe segment;

[0039] The measuring end of the temperature measuring device 3 is arranged inside the first concrete 11 .

[0040] The construction process of a freezing hole blocking structure disclosed in the utility model is as follows:

[0041] First, cut and remove part of the frozen pipes in the pipe segment, and then inject the first concrete (concrete above C20) into the remaining frozen pipes, and use the first concrete to seal the first layer of the freezing hole. Then, use the first sealing plate (steel plate) to tightly weld the first concrete at the cutoff of the freezing pipe to seal the first concrete. At the same time, the two ends of the first sealing plate are further fixed by expansion bolts to improve the sealing firmness of the first concrete, and apply water-expanding water-stop glue on the welding seam to prevent the first concrete from flowing back. Subsequently, the second concrete (C30 sulfate micro-expansive concrete) is used to reinforce and seal the inside of the first sealing plate, and then the second sealing plate (thick steel plate) is used to seal the second concrete on the inside of the second concrete, that is, on the inner wall of the pipe segment, and the second sealing plate is fixed with anchor bolts After the two sealing structures are completed, holes are drilled in the second sealing plate, the second concrete, the first sealing plate, and the first concrete (the hole size is small and has almost no effect on the sealing effect) to form installation holes. The thermocouple is placed in the installation hole so that the measuring end of the thermocouple contacts the first concrete, and its temperature is measured and the temperature change is recorded. The first concrete is in direct contact with the frozen soil outside the pipe segment. Therefore, by monitoring the temperature change of the first concrete, the temperature change of the frozen soil can be obtained, and then the state of the frozen soil can be monitored to confirm whether construction is safe to ensure the safety of construction.

[0042] The utility model discloses a freezing hole plugging structure, which adopts two sealing structures to cooperate with each other to improve the tightness and firmness of the plugging, ensure the sealing effect, and thus prevent the leakage of the frozen liquid; at the same time, the temperature measuring device provided can monitor the temperature change of the frozen soil outside the first concrete by monitoring the temperature change of the first concrete, and then monitor the freezing effect, and can timely know the quality status of the frozen soil, avoiding the problem of not being able to obtain the freezing status of the frozen soil outside the pipe segment after the freezing hole is sealed. This structure can realize the sealing of the freezing hole and ensure the tightness of the plugging, and can also realize the monitoring of the frozen soil status, ensure the freezing quality, and thus ensure the safety of the construction process.

[0043] In a specific embodiment, the temperature measuring device 3 is a thermocouple. This device can directly contact the material being measured and has advantages such as rapid response to temperature changes, high measurement accuracy, and strong adaptability. Therefore, the temperature changes of the frozen soil can be more directly and promptly determined by measuring the temperature changes of the first concrete, thereby obtaining information on changes in the freezing state of the frozen soil, thereby ensuring the quality and stability of the frozen soil and ensuring the safety of the construction process. Thermocouples are conventional devices, and the specific principles of their temperature measurement will not be further described here.

[0044] In a specific embodiment, channels are provided on the second blocking plate 22, inside the second concrete 21, on the first blocking plate 12, and inside the first concrete 11. The channels are connected to form a mounting hole 9, and the temperature measuring device 3 is provided in the mounting hole 9. The provided mounting hole can provide an installation space for the thermocouple, and also enable the thermocouple to be in direct contact with the first concrete after being installed in the mounting hole, so as to measure its temperature in real time. Then, by measuring the temperature change of the first concrete, the temperature change of the frozen soil outside the pipe segment can be known, and the freezing quality can be monitored and mastered.

[0045] In a specific embodiment, the first sealing plate 12 is a steel plate, which is welded to the freezing pipe cutoff 5. In this embodiment, the first sealing plate is a steel plate with a thickness of 10 mm, which is welded to the freezing pipe cutoff, and can seal the first concrete 11 filled in the freezing pipe to prevent it from backflowing.

[0046] In a specific embodiment, both sides of the first sealing plate 11 are fixed to the pipe segment 4, i.e., the inner wall of the freezing hole 5, by expansion bolts 13; in this embodiment, M12 expansion bolts are used to fix (clamp) the first sealing plate on the pipe segment, thereby ensuring the firmness of the first sealing plate and thus ensuring the sealing rigidity of the first sealing structure 1.

[0047] In a specific embodiment, the second sealing plate 21 is a steel plate, and the second sealing plate 21 is fixed to the inner wall 6 of the pipe segment by an anchor bolt 23; in this embodiment, the size (length, width and thickness) of the second sealing plate is 300mm*300mm*12mm, and the second sealing plate adopts a thick steel plate, which can enhance the sealing strength and play a further sealing role, and can further improve the sealing rigidity of the freezing hole. At the same time, anti-rust paint is applied on the outer surface of the thick steel plate to prevent rust and increase the service life, thereby ensuring the sealing strength and sealing effect; the anchor bolt 23 adopts a rear-expanded bottom mechanical anchor bolt to achieve the effect of firmly fixing the second sealing plate on the inner wall of the pipe segment, thereby achieving the sealing effect on the second concrete.

[0048] In a specific embodiment, the welding joint between the first sealing plate 12 and the freezing pipe 5 is coated with sealant; in this embodiment, the sealant is a water-swelling water-stopping glue, which can seal the weld between the first sealing plate 12 and the freezing pipe, thereby preventing the first concrete in the freezing pipe from flowing out through the welding joint between the first sealing plate 12 and the freezing pipe, causing the problem of concrete backflow.

[0049] In a specific embodiment, a sealing material is filled between the second sealing plate 22 and the inner wall 6 of the pipe segment. In this embodiment, the sealing material is epoxy resin, and the gap between the second sealing plate and the pipe segment is densely filled with epoxy resin to prevent the presence of air holes from affecting the airtightness of the second concrete.

[0050] In a specific embodiment, the first concrete 11 is a concrete with a strength of C20 or above; the second concrete 21 is a slightly expansive concrete. The use of concrete with a strength of C20 or above can meet the sealing stiffness while preventing the leakage of the refrigerant. The slightly expansive concrete used is concrete with a certain amount of expansive agent added. During the hydration period of the concrete, it can expand to a certain extent due to the action of the expansive agent, thereby compensating for the shrinkage defect of the concrete, achieving the purpose of preventing concrete cracks, improving concrete performance, improving structural strength, and ensuring sealing stiffness and quality. In this embodiment, C30 sulfate slightly expansive concrete is used.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A freezing hole blocking structure, characterized in that: It comprises a first blocking structure (1), a second blocking structure (2) and a temperature measuring device (3); The first blocking structure and the second blocking structure are sequentially arranged from the outside to the inside at the freezing hole (7) between the freezing pipe cutoff (5) and the inner wall (6) of the pipe segment inside the pipe segment (4), and the measuring end of the temperature measuring device (3) is arranged inside the first blocking structure; The first blocking structure (1) comprises a first concrete (11) filled in the freezing pipe (8) and a first blocking plate (12) fixed at the freezing pipe cutoff (5); the second blocking structure (2) comprises a second concrete (21) filled in the freezing hole (7) and arranged on the inner side of the first blocking steel plate, and a second blocking plate (22) arranged on the inner side of the second concrete and fixed on the inner wall (6) of the pipe segment; The measuring end of the temperature measuring device (3) is arranged inside the first concrete (11).

2. The freezing hole sealing structure according to claim 1, characterized in that: The temperature measuring device (3) is a thermocouple.

3. The freezing hole sealing structure according to claim 1, characterized in that: The second blocking plate (22), the interior of the second concrete (21), the first blocking plate (12) and the interior of the first concrete (11) are all provided with channels, and the channels are connected to form a mounting hole (9), and the temperature measuring device (3) is arranged in the mounting hole.

4. The freezing hole sealing structure according to claim 1, characterized in that: The first blocking plate (12) is a steel plate, and the first blocking plate (12) is welded to the freezing pipe cutoff point (5).

5. The freezing hole sealing structure according to claim 1, characterized in that: Both sides of the first blocking plate (12) are fixed to the pipe segment (4) via expansion bolts (13).

6. The freezing hole sealing structure according to claim 1, characterized in that: The second blocking plate (22) is a steel plate, and the second blocking plate (22) is fixed to the inner wall (6) of the pipe segment via anchor bolts (23).

7. The freezing hole sealing structure according to claim 1, characterized in that: The welding point between the first blocking plate (12) and the freezing pipe (8) is coated with sealant.

8. The freezing hole sealing structure according to claim 1, characterized in that: Sealing material is filled between the second sealing plate (22) and the inner wall (6) of the tube segment.

9. The freezing hole sealing structure according to claim 1, characterized in that: The first concrete (11) is concrete with a strength of C20 or above; the second concrete (21) is micro-expansion concrete.

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