Water gushing prevention pipe cutting hole sealing method

Abstract

The application discloses a kind of methods for preventing gushing pipe cutting hole sealing, first, the rubber capsule is loaded into the pipeline needing pipe cutting hole sealing, the outer periphery of rubber capsule is sealed and matched with the inner wall of pipeline, then liquid supply pipe and exhaust pipe are respectively installed on heat insulation baffle, heat insulation baffle is inserted into the pipe opening of pipeline, and the end of liquid supply pipe and the end of exhaust pipe are inserted into pipeline, the pipe opening of liquid supply pipe is connected with nitrogen storage tank, nitrogen storage tank is opened, liquid nitrogen is supplied into the pipe cavity between rubber capsule and heat insulation baffle by liquid nitrogen through liquid supply pipe, liquid nitrogen vaporization absorbs the heat of surrounding soil layer to form freezing, and finally pipe cutting operation is carried out.The freezing system of the application is simple, and has the technical advantages of short freezing time, low freezing temperature and high frozen soil strength, effectively solves the problem of sudden gushing during pipe cutting hole sealing construction, reduces the major risk of pipe cutting hole sealing construction, ensures the safety of pipe cutting hole sealing construction, and is simple to operate, convenient and efficient in construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of frozen construction pipe cutting, in particular to a water gushing prevention pipe cutting and hole sealing method. BACKGROUND

[0002] The principle of the freezing method is to bury a freezing pipe in a to-be-processed stratum and input a refrigerant in the freezing pipe to lower the temperature of the freezing pipe, so that a frozen soil column is formed around the freezing pipe, adjacent frozen soil columns are connected together to form a frozen soil curtain as the frozen soil column expands, the strength and stability of the soil layer are enhanced, and the underground water is isolated from the underground structure, which has the characteristics of good water isolation, strong adaptability, small environmental impact, etc.

[0003] When the permanent support structure construction is completed, the freezing is stopped, the freezing pipe is cut off, and the freezing pipe is filled and anti-seepage treated, and timely filling and grouting are performed, but when the following working conditions are encountered, how to prevent water gushing during pipe cutting is a difficult problem that has not been properly solved.

[0004] Working condition one: some un-frozen through holes inside the connecting passage are used as thread connection. At present, the thawing and grouting time of the freezing method construction is too long, and forced thawing will reduce the thawing and grouting time, but the through hole pipe in the through hole under the condition of forced thawing will have risks when cutting and sealing the hole.

[0005] Working condition two: when a connecting passage or other underground engineering is constructed, the freezing station is usually arranged in the tunnel, if limited by the site, the cooling tower and the clean water pump cannot be arranged in the middle plate of the working well or in the tunnel, at this time, the cooling tower and the clean water pump can only be arranged on the ground surface, the low-temperature cooling water is transported to the condenser of the freezing machine through the water inlet pipe drilled on the ground surface, the high-temperature cooling water returns to the cooling tower through the return water pipe after heat absorption by the condenser. After the freezing engineering is completed, the water inlet pipe and the return water pipe need to be plugged to ensure safety. The exposed part needs to be cut off before the water pipe is sealed, and water and sand are extremely easy to gush during pipe cutting, which may cause ground subsidence, tunnel segment deformation and other disasters.

[0006] Working condition three: generally, the conventional freezing pipe cutting treatment is to cut off the freezing pipe when the frozen wall has not thawed, that is, the freezing pipe cutting and backfilling are completed within 3 days after stopping freezing. If the number of freezing pipes is large, the pipe cutting engineering quantity is large, and when the pipe cutting is not completed within 3 days, the annular space between the freezing pipe and the borehole wall may have a decreased freezing degree, and water gushing is extremely likely to occur, which may cause tunnel structure damage or even tunnel relocation. SUMMARY

[0007] Therefore, the technical problem to be solved by the present application is to provide a water gushing prevention pipe cutting and hole sealing method capable of quickly freezing the pipe and the stratum in need of pipe cutting construction.

[0008] To solve the above technical problems, the present application provides the following technical solutions: a method for preventing water gushing and pipe cutting and hole sealing, comprising the following steps:

[0009] Step A: loading a rubber capsule into a pipe in need of pipe cutting and hole sealing, the outer periphery of the rubber capsule being sealed and fitted to the inner wall of the pipe;

[0010] Step B: respectively penetrating a liquid supply pipe and an exhaust pipe into a heat insulation baffle, inserting the heat insulation baffle into the pipe opening of the pipe, and inserting the end of the liquid supply pipe and the end of the exhaust pipe into the pipe, with a spacing between the liquid supply pipe and the rubber capsule;

[0011] Step C: connecting the pipe opening of the liquid supply pipe to a nitrogen storage tank, opening the nitrogen storage tank, and supplying liquid nitrogen into the pipe cavity between the rubber capsule and the heat insulation baffle through the liquid supply pipe, the liquid nitrogen being exhausted from the exhaust pipe after vaporization in the pipe cavity, and the liquid nitrogen vaporization absorbing heat from the surrounding soil layer to form freezing;

[0012] Step D: after the freezing is completed, pulling out the heat insulation baffle, and together with the liquid supply pipe and the exhaust pipe, and then performing pipe cutting construction on the pipe;

[0013] Step E: performing filling and hole sealing construction on the pipe opening position of the pipe after the pipe cutting is completed.

[0014] In the above method for preventing water gushing and pipe cutting and hole sealing, in step B, the outer circumferential surface of the heat insulation baffle is gap-fitted to the inner wall of the freezing pipe, and the heat insulation baffle is slidingly fitted in the freezing pipe, and the liquid supply pipe and the exhaust pipe are both sealingly and fixedly connected to the heat insulation baffle.

[0015] In the above method for preventing water gushing and pipe cutting and hole sealing, in step B, the distance between the side wall surface of the tunnel pipe segment in contact with the stratum and the rubber capsule is greater than 0.

[0016] In the above method for preventing water gushing and pipe cutting and hole sealing, the distance between the side wall surface of the tunnel pipe segment in contact with the stratum and the rubber capsule is 30 cm.

[0017] In the above method for preventing water gushing and pipe cutting and hole sealing, the distance between the end of the liquid supply pipe inserted into the freezing cavity and the rubber capsule is 10 cm.

[0018] In the above method for preventing water gushing and pipe cutting and hole sealing, the distance between the end of the exhaust pipe inserted into the freezing cavity and the rubber capsule is greater than the distance between the end of the liquid supply pipe inserted into the freezing cavity and the rubber capsule.

[0019] In the above method for preventing water gushing and pipe cutting and hole sealing, in step B, the axis of the liquid supply pipe coincides with the axis of the heat insulation baffle, and the liquid supply pipe is coaxially arranged with the freezing pipe.

[0020] The pipe cutting hole sealing method prevents water gushing, and in step E, the pipe left in the stratum is filled, the salt water in the pipe is dried by compressed air before filling, and the pipe in the stratum is filled by using M10 or above cement mortar or C20 or above concrete; the pipe length of the pipe with an upward angle is not less than 1.5 m from the pipe opening, the whole pipe is filled for the pipe with a downward angle; for the steel pipe piece, a 10 mm thick steel plate is welded to seal the pipe opening cutting part, the height of the weld is 6 mm, and the weld and the steel pipe piece grid are coated with water-swelling waterproof glue; for the concrete pipe piece, a 10 mm thick steel plate is welded to seal the pipe opening cutting part, the height of the weld is 6 mm, the weld is coated with water-swelling waterproof glue, and then two M12 or above expansion bolts are arranged on the side wall of the concrete pipe piece in the cutting area, the outside of the expansion bolts extends out of the concrete pipe piece by not less than 3 cm, and is welded to the residual part of the pipe opening; then, the grid is filled and a 12 mm thick steel plate is welded to reseal the grid.

[0021] The pipe cutting hole sealing method prevents water gushing, and in step A, a flow dividing cone and a flow guiding ring are arranged on the side wall of the rubber capsule facing the liquid outlet end of the liquid supply pipe, the flow dividing cone and the flow guiding ring are coaxially arranged with the rubber capsule, the small diameter end of the flow dividing cone is arranged towards the liquid outlet end of the liquid supply pipe, and the large diameter end face of the flow dividing cone is fixedly connected with the side wall of the rubber capsule; the axial length of the flow guiding ring gradually increases from the side close to the axis to the side away from the axis, and the outer circumferential surface of the flow guiding ring is sealingly attached to the inner wall of the pipe. By arranging the flow dividing cone and directly facing the flow dividing cone with the liquid supply pipe, the liquid nitrogen can be divided and uniformly dispersed to the surrounding, and under the action of the flow guiding ring, the dispersed liquid nitrogen flows to the inner wall of the pipe, uniformly cools the soil around the pipe, realizes uniform freezing effect, and avoids direct impact of the liquid nitrogen on the rubber capsule, reduces the impact force, ensures the stability of the rubber capsule, and improves the sealing effect of the rubber capsule.

[0022] The pipe cutting hole sealing method prevents water gushing, and in step B, a ring groove is formed in the outer circumferential surface of the heat preservation partition plate, a sealing ring is arranged in the ring groove, the sealing ring is sealingly attached to the inner side wall of the pipe, and at least two ring grooves are arranged. The interval between the two ring grooves is greater than zero, the sealing effect between the heat preservation partition plate and the pipe is improved, a sealing ring is arranged in each ring groove, and the two ring grooves have a certain interval. After the heat preservation partition plate is arranged in the pipe, the two sealing rings are sealingly attached to the inner wall of the pipe, and during freezing construction, water in the pipe or external water cannot enter between the two sealing rings, thereby effectively reducing the possibility that the heat preservation partition plate and the pipe are frozen together after freezing construction, and facilitating rapid disassembly of the heat preservation partition plate after construction is completed.

[0023] The technical scheme of the present application has the following beneficial technical effects:

[0024] The traditional salt water circulation freezing method has the problems of complex system, many required devices, long freezing period, and the like, and the freezing system of the present application has the technical advantages of simple freezing system, few required devices, short freezing time, low freezing temperature, and high frozen soil strength, effectively solves the problems of sudden gushing water during the pipe cutting and hole sealing construction of the water pipe of the connecting passage, the through hole, or the forced thawing frozen pipe, reduces the major risks of the pipe cutting and hole sealing construction, ensures the safety of the pipe cutting and hole sealing construction, and has the advantages of simple operation, convenient and efficient construction. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A schematic diagram of the anti-gushing water pipe cutting and freezing construction of the present application.

[0026] Figure 2 A cross-sectional structure schematic diagram of the rubber capsule of the present application;

[0027] Figure 3 A cross-sectional structure schematic diagram of the heat preservation partition plate of the present application.

[0028] The reference signs in the drawings are shown as follows: 1-tunnel segment; 2-orifice pipe; 3-pipe; 4-heat preservation partition plate; 41-ring groove; 42-sealing ring; 5-liquid supply pipe; 6-exhaust pipe; 7-rubber capsule; 71-flow dividing cone; 72-flow guiding ring; 8-pipe cavity. DETAILED DESCRIPTION

[0029] The anti-gushing water pipe cutting and hole sealing method in the embodiment includes the following steps:

[0030] Step A: loading the rubber capsule 7 into the pipe 3 which needs to be cut and sealed, and sealing and fitting the outer periphery of the rubber capsule 7 with the inner wall of the pipe 3;

[0031] Step B: respectively penetrating and installing the liquid supply pipe 5 and the exhaust pipe 6 on the heat preservation partition plate 4, sealing and fixedly connecting the liquid supply pipe 5 and the exhaust pipe 6 with the heat preservation partition plate 4, inserting the heat preservation partition plate 4 into the pipe opening of the pipe 3, gap fitting the outer circumferential surface of the heat preservation partition plate 4 with the inner wall of the pipe 3, sliding fitting the heat preservation partition plate 4 in the pipe 3, and inserting the end of the liquid supply pipe 5 and the end of the exhaust pipe 6 into the pipe 3; there is a distance between the liquid supply pipe 5 and the rubber capsule 7, and the distance between the end of the liquid supply pipe 5 inserted into the pipe cavity 8 and the rubber capsule 7 is 10 cm; for example, Figure 3As shown, the outer circumferential surface of the heat preservation partition plate 4 is provided with a ring groove 41, and a sealing ring 42 is installed in the ring groove 41. The sealing ring 42 is in sealing contact with the inner side wall surface of the pipeline 3. The ring groove 41 is provided with at least two ring grooves 41, and the interval between the two ring grooves 41 is greater than zero. The sealing ring 42 is installed in each ring groove 41. There is a certain gap between the heat preservation partition plate 4 and the inner wall of the pipeline 3, which ensures that the heat preservation partition plate 4 can enter the pipeline 3, and the sealing ring 42 ensures the sealing effect. After the freezing construction is completed, the heat preservation partition plate 4 and the pipeline 3 may be frozen together. In order to further improve the convenience of disassembling the heat preservation partition plate 4 after the freezing construction is completed, a rubber cylinder is sleeved on the outer circumferential surface of the heat preservation partition plate 4. The rubber cylinder is integrally formed with the sealing ring 42. The sealing ring 42 protrudes from the rubber cylinder. After the freezing construction is completed, the rubber cylinder isolates the heat preservation partition plate 4 and the pipeline 3, so that they are not frozen together, and the heat preservation partition plate 4 can be smoothly pulled out;

[0032] Step C: Connect the pipe opening of the liquid supply pipe 5 with the nitrogen storage tank, open the nitrogen storage tank, and supply liquid nitrogen into the pipe cavity 8 between the rubber capsule 7 and the heat preservation partition plate 4 through the liquid supply pipe 5. The liquid nitrogen is vaporized in the pipe cavity 8 and discharged from the exhaust pipe 6. The liquid nitrogen vaporization absorbs the heat of the surrounding soil layer to form freezing;

[0033] Step D: After the freezing is completed, the heat preservation partition plate 4 is pulled out together with the liquid supply pipe 5 and the exhaust pipe 6. Then, the pipeline 3 is cut and constructed. After the heat preservation partition plate 4 is pulled out, the rubber capsule 7 remains in the pipeline 3. Then, when the pipeline 3 is filled, the rubber capsule 7 is pushed forward under the action of the mortar pressure, so as to ensure the filling effect of the filling section in the pipeline 3, especially for the pipeline 3 with a small horizontal angle. After the pipeline 3 is filled, a complete filling section is formed. When the pipeline 3 is conventionally filled, the flow rate of the mortar in the pipeline 3 decreases due to the length of the pipeline 3, and unevenness of the mortar is easily generated. By arranging the rubber capsule 7 in cooperation with the flow divider cone 71 and the flow guide ring 72, the surface of the rubber capsule 7 is contacted by the mortar, and local fluid stirring effect is generated, which is beneficial to the discharge of gas and makes the mortar filled in the pipeline more uniform, realizes the tight filling of the mortar, and realizes that the filled part of the pipeline 3 can be filled with mortar. Under the action of the flow divider cone 71 and the flow guide ring 72, the mortar can impact the pipe wall of the pipeline 3, improve the bonding strength between the mortar and the inner wall of the pipeline 3, and improve the plugging effect of the pipeline 3;

[0034] Step E: filling and sealing construction is carried out on the pipe 3 pipe orifice position after pipe cutting, the pipe 3 left in the stratum is filled, compressed air is used to dry the salt water in the pipe 3 before filling, and M10 or above cement mortar or C20 or above concrete is used to fill the pipe 3 in the stratum; for the pipe 3 with upward angle, the filling pipe length is not less than 1.5m inside the pipe orifice, for the pipe 3 with downward angle, full section filling is adopted; for the steel pipe piece, 10mm thick steel plate is welded to seal the pipe 3 orifice cutting position, the weld height is 6mm, and the weld and the steel pipe piece grid are smeared with water-swelling waterproof glue; for the concrete pipe piece, 10mm thick steel plate is welded to seal the pipe 3 cutting position, the weld height is 6mm, and the weld is smeared with water-swelling waterproof glue, then M12 or above expansion bolts are constructed on the cutting area of the concrete pipe piece side wall, the expansion bolts outside the concrete pipe piece are extended by not less than 3cm, and are welded and connected with the residual part of the orifice pipe; then the grid is filled and 12mm thick steel plate is welded to reseal the grid.

[0035] In step B, the distance between the side wall of the tunnel segment 1 in contact with the stratum and the rubber capsule 7 is greater than 0, and in actual construction, the distance between the side wall of the tunnel segment 1 in contact with the stratum and the rubber capsule 7 is 30cm; the distance between the one end of the exhaust pipe 6 inserted into the freezing cavity 8 and the rubber capsule 7 is greater than the distance between the one end of the liquid supply pipe 5 inserted into the pipe cavity 8 and the rubber capsule 7, and the axis of the liquid supply pipe 5 coincides with the axis of the heat preservation partition 4, the liquid supply pipe 5 is coaxially arranged with the freezing pipe 3, so that the liquid nitrogen can be normally circulated, and the freezing efficiency is improved.

[0036] As shown in Figure 2 The rubber capsule 7 is provided with a flow dividing cone 71 and a flow guiding ring 72 on the side wall facing the liquid outlet end of the liquid supply pipe 5, the flow dividing cone 71 and the flow guiding ring 72 are coaxially arranged with the rubber capsule 7, the small diameter end of the flow dividing cone 71 is arranged towards the liquid outlet end of the liquid supply pipe 5, and the large diameter end face of the flow dividing cone 71 is fixedly connected with the side wall of the rubber capsule 7; the axial length of the flow guiding ring 72 gradually increases from the side close to the axis to the side away from the axis, and the outer circumferential surface of the flow guiding ring 72 is sealingly fitted with the inner wall of the pipe 3.

[0037] The present application can also be applied to the freezing pipe in the frozen stratum, the water pipe in the stratum or the through-hole pipe which needs to be cut under forced thawing conditions, and similar working conditions with the risk of water gushing during pipe cutting and sealing.

[0038] Obviously, the above embodiments are only examples for clearly illustrating the present application and are not intended to limit the present application. Based on the above description, one of ordinary skill in the art can make other different forms of changes or modifications. Here, it is not necessary or possible to enumerate all the embodiments. The obvious changes or modifications derived from the above should be covered in the protection scope of the present application.

Claims

1. A method of gushing pipe hole sealing, characterized by, The method comprises the following steps: Step A: filling the rubber capsule (7) into the pipe (3) needing pipe cutting and hole sealing, and sealingly fitting the outer periphery of the rubber capsule (7) with the inner wall of the pipe (3); Step B: respectively penetrating the liquid supply pipe (5) and the exhaust pipe (6) into the heat insulation partition plate (4), inserting the heat insulation partition plate (4) into the pipe opening of the pipe (3), and inserting the end of the liquid supply pipe (5) and the end of the exhaust pipe (6) into the pipe (3), and there is a spacing between the liquid supply pipe (5) and the rubber capsule (7); Step C: connecting the liquid supply pipe (5) with the nitrogen storage tank, opening the nitrogen storage tank, and supplying liquid nitrogen into the pipe cavity (8) between the rubber capsule (7) and the heat insulation partition plate (4) through the liquid supply pipe (5), and the liquid nitrogen is vaporized in the pipe cavity (8) and discharged from the exhaust pipe (6), and the liquid nitrogen vaporization absorbs the heat of the surrounding soil layer to form freezing; Step D: after the freezing is completed, the heat insulation partition plate (4) is pulled out, and the liquid supply pipe (5) and the exhaust pipe (6) are pulled out together, and then the pipe cutting construction is carried out on the pipe (3); after the heat insulation partition plate (4) is pulled out, the rubber capsule (7) remains in the pipe (3); Step E: filling and hole sealing construction is carried out on the pipe opening position of the pipe (3) after the pipe cutting is completed; In step A, a flow dividing cone (71) and a flow guiding ring (72) are arranged on the side wall of the rubber capsule (7) facing the liquid outlet end of the liquid supply pipe (5), the flow dividing cone (71) and the flow guiding ring (72) are coaxially arranged with the rubber capsule (7), the small diameter end of the flow dividing cone (71) is arranged towards the liquid outlet end of the liquid supply pipe (5), and the large diameter end face of the flow dividing cone (71) is fixedly connected with the side wall of the rubber capsule (7); the axial length of the flow guiding ring (72) gradually increases from the side close to the axis to the side away from the axis, and the outer circumferential surface of the flow guiding ring (72) is sealingly fitted with the inner wall of the pipe (3).

2. The method of claim 1, wherein, In step B, the outer circumferential surface of the heat insulation partition plate (4) is gap-fitted with the inner wall of the pipe (3), and the heat insulation partition plate (4) is slidingly fitted in the pipe (3); the liquid supply pipe (5) and the exhaust pipe (6) are sealingly and fixedly connected with the heat insulation partition plate (4).

3. The method of claim 1, wherein, In step B, the distance between the side wall of the tunnel segment (1) contacting the stratum and the rubber capsule (7) is greater than 0.

4. The method of claim 3, wherein, The distance between the side wall of the tunnel segment (1) contacting the stratum and the rubber capsule (7) is 30 cm.

5. A method of gushing pipe hole sealing according to claim 4, wherein The distance between the end of the liquid supply pipe (5) inserted into the pipe cavity (8) and the rubber capsule (7) is 10 cm.

6. A method of gushing pipe hole sealing according to claim 5, wherein The distance between the end of the exhaust pipe (6) inserted into the pipe cavity (8) and the rubber capsule (7) is greater than the distance between the end of the liquid supply pipe (5) inserted into the pipe cavity (8) and the rubber capsule (7).

7. The method of claim 1, wherein, In step B, the axis of the liquid supply pipe (5) coincides with the axis of the heat insulation partition plate (4), and the liquid supply pipe (5) is coaxially arranged with the pipe (3).

8. The method of claim 1, wherein, In step E, the pipeline (3) left in the stratum is filled, the salt water in the pipeline (3) is dried by compressed air before filling, and the pipeline (3) in the stratum is filled with cement mortar of M10 or above or concrete of C20 or above; the filling pipe length of the pipeline (3) with an upward angle is not less than 1.5m from the pipe opening, the pipeline (3) with a downward angle is filled in the whole section, the opening cutting part of the steel pipe is welded and sealed with a 10mm thick steel plate, the weld height is 6mm, the weld and the steel pipe grid are coated with water-swelling waterproof glue, the opening cutting part of the concrete pipe is welded and sealed with a 10mm thick steel plate, the weld height is 6mm, the weld is coated with water-swelling waterproof glue, two M12 or above expansion bolts are constructed on the side wall of the concrete pipe in the cutting area, the outside of the expansion bolts extends out of the concrete pipe by a reserved length of not less than 3cm, and is welded and connected with the residual part of the opening pipe, then the grid is filled and welded with a 12mm thick steel plate to reseal the grid.

9. The method of claim 1, wherein, In step B, a ring groove (41) is formed on the outer circumferential surface of the heat preservation partition plate (4), a sealing ring (42) is installed in the ring groove (41), and the sealing ring (42) is sealingly attached to the inner side wall surface of the pipeline (3); the ring groove (41) is provided with at least two, the interval between the two ring grooves (41) is greater than zero, and the sealing ring (42) is installed in each ring groove (41).

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