Tubular pile system shared by dewatering well and cofferdam and construction method

Abstract

The invention discloses a pipe pile system shared by a dewatering well and a cofferdam and a construction method, and relates to the technical field of steel pipe piles. The pipe pile system shared by the dewatering well and the cofferdam comprises a first pipe pile, a second pipe pile and a drainage module. The first pipe pile and the second pipe pile are encircled to form a closed ring shape to form a cofferdam; the second pipe pile comprises a second pipe body and an extending part, and water permeable holes are formed in the side wall of the extending part. The drainage module comprises a submersible pump, a first lifting pipe, a communicating pipe and a second lifting pipe; the first lifting pipe is buckled on the side wall of the second pipe pile in an n shape, and the communicating pipe is arranged at the water bottom position of overground water to avoid freezing; an anti-freezing housing is buckled at the top end of the second pipe body, and a heat preservation gap is formed between the anti-freezing housing and the second pipe body. After the drainage module pumps out underground water, the underground water is drained through the inner cavity of the anti-freezing housing and the water bottom of overground water, the drainage module is prevented from making direct contact with outside cold air and a floating ice layer, the pumped-out underground water is prevented from being frozen, the device can work in the low-temperature environment, and compatibility is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe piles, and in particular to a pipe pile system shared by a dewatering well and a cofferdam and a construction method. Background Art

[0002] When building bridges (such as cable-stayed bridges) in environments such as swamps, lakes, rivers, and oceans, it is necessary to lay cofferdams to block ground water outside the construction site to prevent ground water from having adverse effects on the construction of the bridge (such as foundations, load-bearing columns, etc.); afterwards, it is necessary to build sedimentation wells around the cofferdam to lower the groundwater level to prevent groundwater from having adverse effects on the construction of the bridge, thereby improving construction safety and quality.

[0003] The Chinese patent "A pipe pile structure that also serves as a drainage well" (publication number: CN 208803479 U) discloses a technical solution for using supporting pipe piles as drainage wells, but it is difficult to be compatible with a construction environment rich in ground water. In addition, when operating in a low-temperature environment, groundwater will be frozen when it is pumped above the ground, resulting in the clogging of the water pipe at the wellhead, making it difficult to carry out continuous pumping operations, resulting in reduced construction efficiency. Summary of the invention

[0004] In order to overcome the problem of "the poor environmental compatibility of the technical solution of using pipe piles as drainage wells in the traditional technology" existing in the above background technology, the present invention provides a pipe pile system and construction method shared by drainage wells and cofferdams.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: A pipe pile system for a precipitation well and a cofferdam, comprising a first pipe pile, a second pipe pile and a drainage module; the first pipe pile and the second pipe pile are arranged in a closed ring to form a cofferdam for stopping ground water; the second pipe pile comprises a second pipe body and an extension part connected and communicated with the bottom end of the second pipe body, and the side wall of the extension part is provided with a water permeable hole for infiltrating ground water; the extension part is a cylindrical structure; the drainage module comprises a submersible pump, a first lifting pipe, a connecting pipe and a second lifting pipe; the submersible pump is arranged in the inner cavity of the extension part; the first lifting pipe, the connecting pipe and the second lifting pipe are connected and communicated in sequence; the first lifting pipe is buckled at the side wall of the second pipe pile in an n-shaped manner, one end of the first lifting pipe is connected and communicated with the submersible pump, and the other end is arranged at the bottom of the ground water, and the connecting pipe is arranged at the bottom of the ground water to avoid freezing; the second lifting pipe is connected to a water reservoir; an antifreeze cover is buckled at the top of the second pipe body, and a heat preservation gap is provided between the antifreeze cover and the second pipe body, and the first lifting pipe comprises a top bending part arranged in the heat preservation gap to avoid freezing.

[0006] As a further optimization solution of the present invention, the bottom end of the antifreeze cover is inserted into the ground water to close the insulation gap; the bottom end of the antifreeze cover is located below the floating ice layer.

[0007] As a further optimization scheme of the present invention, the first lifting pipe also includes a first riser portion and a second riser portion respectively connected and communicated with both ends of the top bending portion, the first riser portion is longitudinally arranged in the inner cavity of the second pipe pile, and the second riser portion is longitudinally arranged at the outer wall of the second pipe pile.

[0008] As a further optimization solution of the present invention, a thermal insulation ice layer formed by freezing liquid water and a receiving cavity for receiving the thermal insulation ice layer are provided in the antifreeze shell.

[0009] As a further optimization solution of the present invention, the vertical cross-section of the accommodating cavity is in an N-shape.

[0010] As a further optimization solution of the present invention, the antifreeze cover can be turned over to face the opening upward, thereby facilitating the injection of the liquid water.

[0011] As a further optimization scheme of the present invention, a support assembly for supporting the antifreeze cover shell is provided at the top end of the second tube body; the support assembly is detachably connected to the second tube body, and the antifreeze cover shell is detachably crimped to the support assembly.

[0012] As a further optimization scheme of the present invention, an electrically controlled liquid level gauge is provided in the insulation gap, and the electrically controlled liquid level gauge is used to monitor the liquid level in the insulation gap to prevent the ground water from flowing into the second pipe pile; the electrically controlled liquid level gauge is connected to the alarm system through an external monitoring device.

[0013] As a further optimization scheme of the present invention, a side pit is provided on the side wall of the water reservoir, and a compensating water pump connected to and communicated with the second lifting pipe is arranged in the side pit; a sealing plate that can be opened and closed is provided at the top opening position of the water reservoir to prevent the compensating water pump from being frozen.

[0014] A construction method for a pipe pile system, that is, the steps of constructing a pipe pile system shared by a precipitation well and a cofferdam include: S1, drilling a hole; S2, lowering the first pipe pile and the second pipe pile to the bottom of the hole respectively; S3, installing the drainage module; S4, installing the support assembly on the top of the second pipe body; S5, taking the antifreeze cover and turning it to an open upward state, injecting the liquid water into the accommodating cavity; after the liquid water freezes into ice, buckling the antifreeze cover on the top of the second pipe body.

[0015] In summary, the present invention has at least one of the following benefits: (1) The present invention has a simple structure and reliable functions. The first pipe pile and the second pipe pile are surrounded in a closed ring to form a cofferdam for blocking ground water, thereby preventing the unfinished cable-stayed bridge from being eroded by ground water, so that the present invention can operate in an environment rich in ground water; after the drainage module pumps out the ground water, it is discharged through the inner cavity of the antifreeze cover and the bottom of the ground water, thereby preventing the drainage module from direct contact with the external cold air and floating ice layer, thereby avoiding the problem of the pumped ground water being frozen, so that the present invention can operate in a low-temperature environment; compared with traditional technologies, the compatibility of the present invention with the construction environment is greatly improved.

[0016] (2) The antifreeze cover is buckled on the top of the second pipe body, and the bottom of the antifreeze cover passes through the floating ice layer and is inserted into the ground water, so that the insulation gap and the inner cavity of the second pipe pile are in a relatively sealed environment, avoiding air circulation with the outside, reducing the heat loss of the air near the first lifting pipe, and achieving insulation of the pumped groundwater.

[0017] (3) An insulating ice layer is provided inside the antifreeze cover, and the insulating ice layer is used to increase the thickness of the antifreeze cover, thereby reducing the heat loss rate of the air in the insulating gap; the bottom end of the insulating ice layer is inserted into the ground water and contacts the ground water, thereby avoiding the problem of the insulating ice layer becoming shorter and thinner after sublimation.

[0018] (4) After turning over the antifreeze cover, pour ground water into the containing cavity, and wait for it to freeze to form an insulating ice layer, so that local materials can be used; the antifreeze cover in the hollow state is lighter and easier to transport.

[0019] (5) The antifreeze cover and the floating ice layer freeze to each other. When the water level on the ground changes, the antifreeze cover and the floating ice layer can float up and down synchronously, so that the bottom end of the antifreeze cover and the bottom end of the insulating ice layer are always inserted into the ground water.

[0020] (6) The end of the connecting pipe and the second lifting pipe are buried in the rock and soil layer to avoid the problem of internal groundwater freezing; the second lifting pipe is connected to the water reservoir, and a sealing plate with a heat-insulating function is installed at the top opening of the water reservoir to prevent the end of the second lifting pipe and the compensation water pump from freezing.

[0021] (7) An electric liquid level gauge for monitoring the liquid level is installed in the insulation gap to prevent the liquid level in the insulation gap from rising due to negative pressure and flowing into the second pipe pile; at the same time, the antifreeze cover insulates the ground water in the insulation gap so that the electric liquid level gauge and nearby water will not be frozen, ensuring that the electric liquid level gauge is in operation; at the same time, the antifreeze cover can block the outside wind so that the ground water level in the insulation gap will not produce waves, allowing the electric liquid level gauge to monitor and obtain relatively stable and accurate data. The ground water inside the antifreeze cover has low fluidity, which can prevent the water flow from scouring the electric liquid level gauge, so the use of a longer electric liquid level gauge will not cause bending and deformation.

[0022] (8) The top of the electric-controlled liquid level gauge is inserted and fixed in the limit fin of the support assembly, so that the lower and middle parts of the electric-controlled liquid level gauge are suspended in the air, thereby preventing the side wall of the electric-controlled liquid level gauge from contacting the antifreeze cover, thereby preventing the electric-controlled liquid level gauge from being frozen. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application is further described below with reference to the accompanying drawings: Figure 1 It is a front view schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic top view of the overall structure of the present invention; Figure 3 is a schematic front view of the structure of the first pipe pile and the second pipe pile; Figure 4 is a schematic diagram of the structure of the second tube body and the extension part; Figure 5 This is a schematic diagram of the location and structure of the drainage module; Figure 6 is a schematic diagram of the position and structure of the first riser; Figure 7 It is a schematic diagram of the vertical section structure of the antifreeze cover with its opening facing upward; Figure 8 This is a schematic diagram of the installation position of the electronically controlled liquid level gauge; Fig. 9 It is a schematic diagram of the supporting component structure; Fig.10 A schematic diagram of the position and structure of the first protrusion and the second protrusion; Fig.11 A schematic diagram of the position of the vent hole is provided; Fig.12 It is a cross-sectional top view of a state where the first tube body and the second tube body are connected via a locking structure; Fig.13 It is a cross-sectional top view of adjacent first tubes connected via a locking structure.

[0024] Description of reference numerals: In the figure, 1. The first pipe pile; 11. The first pipe body; 2. Second pipe pile; 21. Second pipe body; 211. Antifreeze cover; 2111. Accommodating cavity; 2112. Support column; 2113. Ventilation hole; 2114. Strip hole; 212. Insulation gap; 22. Extension; 23. Support assembly; 231. Inner tube; 232. Limiting fin; 2321. First protrusion; 233. Notch; 2331. Second protrusion; 24. Electronically controlled liquid level gauge; 3. Drainage module; 31. Submersible pump; 32. First riser; 321. Top bending portion; 322. First riser portion; 323. Second riser portion; 33. Connecting pipe; 34. Second riser; 4. Water on the ground; 41. Floating ice layer; 5. Rock and soil layer; 6. Groundwater; 7. Water reservoir; 71. Side pit; 72. Compensation water pump; 73. Sealing plate; 8. Locking structure; 81. Female mouth; 82. Male mouth; 83. Canvas bag; 84. Mortar. DETAILED DESCRIPTION

[0025] Based on the above structural features of the present application, the implementation methods of the present application are further described: Reference Figure 1-2 This embodiment provides a pipe pile system used in a drainage well and a cofferdam, including a first pipe pile 1, a second pipe pile 2 and a drainage module 3. The first pipe pile 1 and the second pipe pile 2 are both arranged longitudinally. There are a plurality of first pipe piles 1, and a plurality of second pipe piles 2; the lower part of the first pipe pile 1 and the lower part of the second pipe pile 2 are both inserted into the rock and soil layer 5, and the first pipe pile 1 and the second pipe pile 2 are surrounded in a closed ring to form a cofferdam for stopping the ground water 4. The load-bearing column of the cable-stayed bridge is constructed on the inner side of the cofferdam, and the ground water 4 is blocked on the outer side of the cofferdam, thereby preventing the ground water 4 from interfering with the construction of the load-bearing column.

[0026] Reference Figure 1 and Figure 3 The first pipe pile 1 includes a first pipe body 11, and the first pipe body 11 is a spiral welded pipe structure; Figure 3 and Figure 4 The second pipe pile 2 includes a second pipe body 21 and an extension part 22 connected and communicated with the bottom end of the second pipe body 21. The inner cavity of the second pipe body 21 and the inner cavity of the extension part 22 are communicated with each other, so as to be used to discharge the groundwater 6. The second pipe pile 2 is a spiral welded pipe structure; the second pipe body 21 and the extension part 22 are coaxially arranged and fixedly connected (for example, by an integrated and welded fixed connection). The side wall of the extension part 22 is provided with a water-permeable hole for infiltrating the groundwater 6; the groundwater 6 in the rock and soil layer 5 flows into the inner cavity of the extension part 22 through the water-permeable hole, and then is discharged through the drainage module 3, thereby effectively reducing the water level of the groundwater 6 and reducing the water content of the rock and soil layer 5 inside the cofferdam, so as to avoid the interference of the groundwater 6 on the construction of the cable-stayed bridge (the bearing column).

[0027] The extension part 22 is in a cylindrical structure. The first pipe pile 1 and the second pipe pile 2 are both in a cylindrical structure.

[0028] An isolation net is provided on the outer wall or inner wall of the extension part 22 to prevent mud and gravel from blocking the water permeable hole. When the isolation net is provided on the outer wall of the extension part 22, a multi-layer plastic mesh is used, and the isolation net is wrapped around the outer wall of the extension part 22 and tied with wire or rope; when the isolation net is provided on the inner wall of the extension part 22, an isolation net structure formed by superimposing multi-layer plastic nets and multi-layer sponge nets is used, and the inner support ring is used to press the inner wall of the extension part 22; the outer wall of the inner support ring and the inner wall of the extension part 22 squeeze the edge of the isolation net from the inner and outer sides respectively, and the inner support ring and the extension part 22 are fixedly connected by bolts.

[0029] The bottom end of the extension part 22 is a sealing structure to prevent mud and sand from entering the inner cavity of the extension part 22 and blocking the submersible pump 31. A metal bottom plate is provided at the bottom end of the extension part 22, and the bottom plate is sealed and fixedly connected to the side wall of the extension part 22 (for example, fixedly connected by bolts and sealing rings or fixedly connected by welding); or, the isolation net covers the bottom opening of the extension part 22 from the inside or outside to achieve sealing.

[0030] Reference Figure 5 The drainage module 3 includes a submersible pump 31, a first lifting pipe 32, a connecting pipe 33, and a second lifting pipe 34; the submersible pump 31 is arranged in the inner cavity of the extension part 22; the first lifting pipe 32, the connecting pipe 33, and the second lifting pipe 34 are sequentially connected and connected; the first lifting pipe 32 is buckled at the side wall of the second pipe pile 2 in an n-shaped manner, one end of the first lifting pipe 32 is connected and connected to the submersible pump 31, and the other end is arranged at the bottom of the ground water 4, and the connecting pipe 33 is arranged at the bottom of the ground water 4 and in the rock and soil layer 5, so as to avoid freezing (the floating ice layer 41 is located on the upper surface of the ground water 4, so as to have a heat preservation effect on the middle and bottom of the ground water 4); the second lifting pipe 34 is buried in the rock and soil layer 5 and is upright (i.e., vertically arranged), and the second lifting pipe 34 is connected to the water reservoir 7. The drainage module 3 can extract the groundwater 6 that has infiltrated into the inner cavity of the extension part 22, and then discharge it into the water reservoir 7, while avoiding the problem of freezing of the groundwater 6 during the transportation process, and ensuring the smoothness of transportation. The second pipe pile 2 functions as a precipitation well, but the produced groundwater 6 cannot be directly discharged into the surface water 4 or the urban sewage system, but needs to be discharged into the reservoir 7 for temporary storage and then discharged after treatment.

[0031] Reference Figure 5 and Figure 6, an antifreeze cover 211 is provided at the top of the second pipe body 21, and an insulation gap 212 is provided between the antifreeze cover 211 and the second pipe body 21, and the first riser 32 includes a top bending portion 321 arranged in the insulation gap 212 to avoid freezing. The antifreeze cover 211 is used to prevent the second pipe pile 2 and the top bending portion 321 from being directly exposed to the outside air (i.e., avoiding contact and convection with the outside air), thereby achieving an insulation effect and avoiding freezing. Although the heat in the insulation gap 212 will continue to dissipate to the outside, the groundwater 6 contains geothermal energy and is in a non-freezing state. Therefore, when the groundwater 6 is extracted to flow through the insulation gap 212, heat compensation for the insulation gap 212 can be achieved. At the same time, the geothermal energy contained in the rock and soil layer 5 and the groundwater 6 will continue to overflow through the inner cavity of the second pipe pile 2 (with air as the medium), and heat compensation for the insulation gap 212 is achieved simultaneously.

[0032] Reference Figure 5 The bottom end of the antifreeze cover 211 is inserted into the ground water 4 to close the insulation gap 212, preventing the air in the insulation gap 212 from contacting / convection with the outside air, thereby slowing down the speed of heat loss in the insulation gap 212. The bottom end of the antifreeze cover 211 is located below the floating ice layer 41; the liquid water in the gap between the floating ice layer 41 and the outer wall of the antifreeze cover 211 will gradually freeze, thereby improving the sealing of the insulation gap 212.

[0033] Reference Figure 5 and Figure 6 The first lifting pipe 32 also includes a first riser portion 322 and a second riser portion 323 respectively connected to the two ends of the top bending portion 321, and the two ends of the top bending portion 321 are respectively connected to the first riser portion 322 and the second riser portion 323. The first riser portion 322 is longitudinally arranged in the inner cavity of the second pipe pile 2, and the second riser portion 323 is longitudinally arranged at the outer wall position of the second pipe pile 2, thereby realizing the discharge of groundwater 6.

[0034] Reference Figure 5 and Figure 6 Since the two ends of the top bending portion 321 bear the weight of the first riser portion 322 and the second riser portion 323 respectively, in order to avoid the position where the top bending portion 321 and the second tube body 21 are pressed and blocked, it is necessary to use a hard material (such as stainless steel, titanium alloy and other rust-proof materials) to manufacture the top bending portion 321, or install a bracket at the top position of the inner cavity of the second tube body 21, and the bracket is connected to the outer wall of the first riser portion 322, so that the bracket bears the weight of the first riser portion 322. The bracket used to fix the tubular structure in the well is a conventional existing technology in the industry, and the details are not repeated.

[0035] Reference Figure 5 and Figure 6If necessary, electric heating wires are wound around the outer surface of the top bending portion 321, the upper outer surface of the first vertical pipe portion 322, and the upper outer surface of the second vertical pipe portion 323 to cope with extremely cold environments and prevent the groundwater 6 from freezing when flowing over the floating ice layer 41. The electric heating wires are spirally shaped to fit the outer surfaces of the top bending portion 321 / the first vertical pipe portion 322 / the second vertical pipe portion 323.

[0036] Reference Figure 5 and Figure 6 The second riser portion 323 does not contact the antifreeze cover 211, thereby avoiding the problem of direct heat conduction between the second riser portion 323 and the antifreeze cover 211, and further improving the thermal insulation of the first riser 32. The second riser portion 323 is attached to the outer wall of the second tube body 21 (for example, by winding or hooping with metal wire, binding band, hoop, etc.), so that the second riser portion 323 is as far away from the antifreeze cover 211 as possible.

[0037] Reference Figure 5 and Figure 7 The antifreeze shell 211 is provided with an insulating ice layer formed by freezing liquid water and a receiving chamber 2111 for receiving the insulating ice layer. The vertical section of the receiving chamber 2111 is in the shape of the letter N, and the vertical section of the antifreeze shell 211 is in the shape of the letter N. The antifreeze shell 211 is a double-wall structure, and the double walls are fixedly connected by support columns 2112 (for example, by an integrated fixed connection), and the support columns 2112 support the receiving chamber 2111. When in use, the insulating ice layer can provide insulation for the insulating gap 212; after use, the insulating ice layer can be poured out after melting into liquid water; thereby reducing the weight and transportation cost of the antifreeze shell 211.

[0038] Reference Figure 5 The bottom end of the antifreeze cover 211 is inserted into the ground water 4, so that the end of the insulating ice layer is immersed in the water without contacting the outside air, thereby avoiding the problem of sublimation causing the insulating ice layer to become shorter and thinner (the antifreeze cover 211 can seal the inner and outer walls of the insulating ice layer, and the water molecules in the ground water 4 will compensate for the water molecules lost at the bottom of the insulating ice layer due to melting after freezing).

[0039] Reference Figure 7 , the antifreeze cover 211 can be turned over to a state with the opening facing upward, so that it is convenient for the user to inject liquid water into the receiving chamber 2111. The opening of the receiving chamber 2111 is located at the end surface of the antifreeze cover 211. When the antifreeze cover 211 is turned over to a state with the opening facing upward, the opening of the receiving chamber 2111 faces upward, so as to facilitate the injection of liquid water. Liquid water can directly use ground water 4, so as to realize local materials and improve the convenience of construction and transportation.

[0040] Reference Figure 8A support assembly 23 for supporting the antifreeze shell 211 is provided at the top of the second tube body 21; the support assembly 23 is detachably connected to the second tube body 21, and the antifreeze shell 211 and the support assembly 23 are detachably crimped, thereby facilitating the loading and unloading of the support assembly 23 and the antifreeze shell 211.

[0041] Reference Figure 8 and Fig. 9 The support assembly 23 includes an inner tube 231 and a limiting fin 232. The lower part of the outer wall of the inner tube 231 can be adapted to fit the inner wall of the second tube body 21, so that the lower part of the inner tube 231 is stably plugged into the top of the inner cavity of the second tube body 21. The limiting fin 232 is C-shaped and is placed in the middle of the outer wall of the inner tube 231. When the lower part of the inner tube 231 is plugged into the inner cavity of the second tube body 21, the limiting fin 232 is pressed on the top surface of the second tube body 21 to prevent the support assembly 23 from falling downward. The outer wall of the limiting fin 232 is adapted to the inner wall of the antifreeze cover 211, so that the antifreeze cover 211 is stably buckled on the outer periphery of the support assembly 23. The top surface of the inner cavity of the antifreeze cover shell 211 is pressed against the top surface of the inner cylinder 231, so that the support assembly 23 can achieve high support for the antifreeze cover shell 211, avoiding the problem of the antifreeze cover shell 211 contacting and compressing the top bending portion 321. At the same time, the top surface of the antifreeze cover shell 211 maintains a certain distance from the top bending portion 321, thereby improving the thermal insulation performance of the thermal insulation gap 212.

[0042] Reference Fig.10 A small number (e.g., three) of first protrusions 2321 are provided on the outer side wall of the limiting fin 232. The first protrusions 2321 are arranged in a circular array with equal spacing and equal angles on the outer side wall of the limiting fin 232 (e.g., through an integrated fixed connection). The first protrusions 2321 abut between the limiting fin 232 and the antifreeze cover 211, thereby reducing the contact area between the support assembly 23 and the antifreeze cover 211, and further reducing the heat exchange speed. The first protrusions 2321 extend outward.

[0043] Reference Fig.10 A small number (e.g., three) of second protrusions 2331 are disposed on the top surface of the inner cylinder 231. The second protrusions 2331 are arranged in a circular array at equal intervals and angles on the top surface of the inner cylinder 231 (e.g., through an integrated fixed connection). The second protrusions 2331 abut between the limiting fins 232 and the antifreeze shell 211, thereby reducing the contact area between the support assembly 23 and the antifreeze shell 211, and further reducing the heat exchange speed. The second protrusions 2331 extend upward.

[0044] After the present invention is installed, the floating ice layer 41 will freeze with the antifreeze shell 211, so the antifreeze shell 211 can be prevented from accidentally falling off from the support assembly 23, and has excellent structural stability.

[0045] Reference Figure 8 , Fig. 9 and Fig.10 A notch 233 is provided at the upper portion of the side wall of the inner tube 231 , and the notch 233 is connected to the opening of the C-shaped limiting fin 232 ; the top bent portion 321 is inserted into the notch 233 and the opening of the C-shaped limiting fin 232 , thereby realizing the layout of the first lifting tube 32 .

[0046] The outer wall of the top bending portion 321 is covered with insulation foam, which can be adapted to be inserted into the opening of the notch 233 and the C-shaped limiting fin 232. The insulation foam is used to prevent the top bending portion 321 from directly contacting the support assembly 23, thereby reducing the heat exchange between the support assembly 23 and the first rising pipe 32.

[0047] Reference Figure 8 , an electric-controlled liquid level gauge 24 is provided in the insulation gap 212, and the electric-controlled liquid level gauge 24 is used to monitor the liquid level in the insulation gap 212 in real time to prevent the ground water 4 from flowing into the second pipe pile 2; the electric-controlled liquid level gauge 24 is electrically connected to the alarm system through an external monitoring device. As the water level of the groundwater 6 in the second pipe pile 2 continues to drop, if the sealing performance in the well is good, a negative pressure will be generated in the inner cavity of the second pipe pile 2, causing the liquid level of the ground water 4 in the insulation gap 212 to continue to rise, further causing the ground water 4 to submerge the top of the second pipe body 21 and flow into the ground; therefore, it is necessary to use an electric-controlled liquid level gauge 24, which has a built-in wireless signal transmitter, and can transmit the collected liquid level signal in real time to an external monitoring device (such as an external mobile phone, computer, etc., a computing device with a built-in signal receiving device), and the external monitoring device compares the received liquid level signal data with the built-in preset data, so as to evaluate whether it is necessary to activate the alarm system to alert the user. The alarm system is set in the external monitoring device.

[0048] Reference Figure 8 and Fig. 9 The top of the electric-controlled liquid level gauge 24 is inserted into the limiting fin 232 of the support assembly 23 and fixedly connected (for example, fixedly connected by bolts), and the electric-controlled liquid level gauge 24 is arranged in the middle of one side of the thermal insulation gap 212, so as to avoid the side wall of the electric-controlled liquid level gauge 24 from contacting with the antifreeze shell 211 (the side wall of the electric-controlled liquid level gauge 24 is in direct contact with the antifreeze shell 211, and there is a risk of mutual freezing; and the electric-controlled liquid level gauge 24, especially the electric-controlled float liquid level gauge, will fail to function if frozen). The surface water 4 liquid level outside the antifreeze shell 211 will produce waves under the action of wind or its own flow velocity, while the surface water 4 liquid level inside the antifreeze shell 211, that is, in the thermal insulation gap 212, will not produce waves due to the obstruction of the side wall of the antifreeze shell 211, so that the electric-controlled liquid level gauge 24 has higher measurement accuracy and will not detect dynamic data.

[0049] Reference Figure 8 and Fig. 9The limiting fins 232 limit the antifreeze shell 211 to prevent the antifreeze shell 211 from moving laterally and hitting and damaging the electronically controlled liquid level gauge 24 (under the impact of the floating ice layer 41 and the ground water 4, the antifreeze shell 211 has a tendency to shake laterally).

[0050] When the user receives the alarm, he goes to the construction site to perform maintenance work to solve the problem of the liquid level in the insulation gap 212 being too high.

[0051] Reference Fig.11 The corresponding positions of the inner and outer walls of the antifreeze cover 211 are provided with ventilation holes 2113, and the ventilation holes 2113 are connected with the accommodating chamber 2111. The user inserts the drill bit of the electric drill into the ventilation hole 2113 and drills through the insulating ice layer, and then pulls out the drill bit of the electric drill, thereby achieving the connection between the inside and outside of the antifreeze cover 211, and the liquid level in the insulating gap 212 will gradually drop. If necessary, positive pressure gas can be injected into the insulating gap 212 through the ventilation hole 2113, so as to press the liquid level in the insulating gap 212 as much as possible to reduce the frequency of maintenance operations.

[0052] When positive pressure gas needs to be injected, it can be achieved by using an air pump or a gas cylinder storing high-pressure gas. The air pump and the gas cylinder are respectively connected to air pipes, and an air nozzle that can be adapted and inserted into the vent 2113 is installed at the end of the air pipe. Liquid water is sprinkled between the air nozzle and the vent 2113, and after the liquid water freezes, the air nozzle and the vent 2113 can be sealed. If the air nozzle is made of metal material, heating the air nozzle (for example, using an open flame or an electric heating rod) can melt the ice around the air nozzle, so that the air nozzle can be pulled out; when the degree of freezing is light, the air nozzle can be directly pulled out / lifted out by force.

[0053] Reference Fig.11 After the liquid level in the insulation gap 212 drops back / is pressed down, take an icicle that fits the vent 2113 and insert it into the vent 2113, then sprinkle liquid water on the connection between the icicle and the vent 2113. After the liquid water between the vent 2113, the icicle, and the insulation ice layer freezes, the vent 2113 is sealed. The next time you overhaul, use the drill bit of the electric drill to drill through the icicle again, so as to open the vent 2113. When the icicle is pushed by the internal air pressure and cannot be stably inserted into the vent 2113 to wait for the liquid water to freeze, use a strap to tie the antifreeze cover 211 and the icicle together to prevent the icicle from being pushed out by the air pressure.

[0054] Reference Fig.11 and Figure 7Due to the existence of the vent 2113, after liquid water is injected into the inverted antifreeze cover 211, water leakage will occur at the vent 2113 position; at this time, it is necessary to stick waterproof tape at the vent 2113 position on the inner and outer surfaces of the antifreeze cover 211 to achieve temporary sealing; after the liquid water in the accommodating cavity 2111 is frozen, remove the waterproof tape.

[0055] Reference Figure 5 , a side pit 71 is provided on the side wall of the water reservoir 7, which is located in the middle and upper part of the side wall of the water reservoir 7. A compensating water pump 72 connected to and communicated with the second lifting pipe 34 is provided in the side pit 71, and the drainage pipe of the compensating water pump 72 points to the inner cavity of the water reservoir 7. The compensating water pump 72 is used to compensate for the problem of insufficient water pressure caused by the long-distance transportation of groundwater 6 by the submersible pump 31. The pumped groundwater 6 is injected into the water reservoir 7 after passing through the second lifting pipe 34 and the compensating water pump 72. The second lifting pipe 34 is used to increase the outlet height of the drainage module 3, so that the water reservoir 7 can be set shallower, and there is no need to force the height of the bottom end of the water reservoir 7 to be lower than the bottom of the ground water 4 / connecting pipe 33, so as to facilitate the later discharge or extraction of water in the water reservoir 7.

[0056] Reference Figure 5 The reservoir 7 is constructed on a hillside near the groundwater 4 , or an isolation (such as a retaining wall) is provided between the groundwater 4 and the reservoir 7 , so as to prevent the groundwater 4 from flowing into the reservoir 7 .

[0057] Reference Figure 5 The top opening of the water reservoir 7 is provided with a sealing plate 73 that can be opened and closed to prevent the compensating water pump 72 from freezing. The sealing plate 73 is used to block the top opening of the water reservoir 7, thereby reducing the flow and heat exchange between the air in the water reservoir 7 and the outside air, thereby having a heat preservation effect on the water reservoir 7 and preventing the compensating water pump 72 from freezing and causing the water to be unable to discharge.

[0058] A construction method of a pipe pile system, that is, the steps of constructing a pipe pile system shared by a precipitation well and a cofferdam include: S1. Drilling with a drilling machine to adapt the first pipe pile 1 and the second pipe pile 2 to have different depths, so that the first pipe body 11 and the second pipe body 21 are at approximately the same height position, thereby forming a cofferdam.

[0059] S2, lowering the first pipe pile 1 and the second pipe pile 2 to the bottom of the hole respectively, and filling the gap between the first pipe pile 1 and the hole and the gap between the second pipe pile 2 and the hole with fillers (such as underwater concrete) to achieve stable installation of the first pipe pile 1 and the second pipe pile 2.

[0060] S3. Install drainage module 3.

[0061] S4, installing (plugging) the support assembly 23 on the top end of the second tube body 21.

[0062] S5, take the antifreeze cover 211 and turn it over to a state where the opening faces upward, and inject liquid water into the accommodating cavity 2111; after the liquid water freezes into ice, buckle the antifreeze cover 211 on the top of the second tube body 21.

[0063] Step S3 includes lowering the submersible pump 31, and laying out the first riser 32, the connecting pipe 33, and the second riser 34. The use of a winch can conveniently achieve the lowering of the submersible pump 31 and the first riser 322, which is a conventional existing technology in the industry and will not be described in detail. The laying out of the first riser 32, the connecting pipe 33, and the second riser 34 is a conventional existing technology in the industry and will not be described in detail.

[0064] Reference Fig.12 and Fig.13 The locking structure 8 is used to achieve a sealed connection between the adjacent first tube body 11 and the second tube body 21, and between two adjacent first tube bodies 11, so as to prevent water leakage in the cofferdam. The locking structure 8 includes a female opening 81, a male opening 82, a canvas bag 83 and a mortar 84. The cross section of the female opening 81 is C-shaped, the cross section of the male opening 82 is T-shaped, the male opening 82 can be inserted into the female opening 81, the canvas bag 83 is placed in the female opening 81 and fits with the inner wall of the female opening 81 and the end plate of the male opening 82, and the mortar 84 is placed in the canvas bag 83 to support the female opening 81, the male opening 82 and the canvas bag 83 to be close to each other to achieve sealing. When the locking structure 8 is used to seal the connection between the adjacent first tube body 11 and the second tube body 21, the female opening 81 and the male opening 82 are fixedly connected to the outer wall of the first tube body 11 and the outer wall of the second tube body 21 respectively (for example, sealed and fixedly connected by welding). When the locking structure 8 is used to seal and connect two adjacent first tubes 11 , the female opening 81 and the male opening 82 are respectively fixedly connected to the outer side walls of the two first tubes 11 (for example, sealed and fixedly connected by welding).

[0065] A gravel filter layer is disposed on the periphery of the extension portion 22 to pre-filter the groundwater 6. The gravel filter layer is a conventional prior art in the industry and will not be described in detail.

[0066] The submersible pump 31, the electric-controlled liquid level gauge 24 and the electric heating wire are respectively connected to the wires, which pass through the insulation gap 212 and are connected to an external power source (such as a temporary power supply system, a vehicle / ship-mounted power supply, etc.).

[0067] The antifreeze cover 211 and the floating ice layer 41 are mutually frozen. When the water level of the ground water 4 rises, the floating ice layer 41 will be pushed up, further driving the antifreeze cover 211 to float up. To prevent the antifreeze cover 211 from falling out of the top of the second tube body 21, a steel chain is used to connect the bottom of the antifreeze cover 211 and the side wall of the second tube body 21. When the water level of the ground water 4 does not rise, the steel chain acts as a counterweight for the antifreeze cover 211, pulling the antifreeze cover 211 to be stably pressed onto the support assembly 23. When the water level of the ground water 4 rises, the steel chain is tightened and pulls the antifreeze cover 211 downward to prevent the antifreeze cover 211 from floating up excessively and being separated from the top of the second tube body 21. Even if the water level of the ground water 4 rises to cover the antifreeze cover 211 (a round plate is welded on the top of the first tube body 11 to achieve sealing; the top of the first tube body 11 needs to be lengthened), it will not cause the ground water 4 to flow into the second pipe pile 2; when the water level of the ground water 4 is much higher than the height of the antifreeze cover 211, under the influence of hydraulic pressure, the air in the insulation gap 212 is compressed, which may cause the ground water 4 to flow into the second pipe pile 2, and it is necessary to inject high-pressure gas into the insulation gap 212 to avoid such problems. A first hanging ring is fixedly installed at the bottom end of the antifreeze cover 211 (for example, through an integrated fixed connection or a bolted fixed connection), and the top end of the steel chain is buckled with the first hanging ring; a second hanging ring is provided on the outer wall of the second tube body 21, and a self-locking hook is buckled at the bottom end of the steel chain. The self-locking hook and the second hanging ring are detachably connected, so as to be used for loading and unloading the antifreeze cover 211. The antifreeze cover 211 and the floating ice layer 41 are frozen to each other. When the water level of the ground water 4 changes, the antifreeze cover 211 and the floating ice layer 41 can float up and down synchronously (when the steel chain is not tightened), so that the bottom end of the antifreeze cover 211 and the bottom end of the insulating ice layer are always inserted into the ground water 4.

[0068] Reference Figure 7 and Fig.13 , an accommodation gap is provided between adjacent first tube bodies 11 and second tube bodies 21, and between two adjacent first tube bodies 11, and the accommodation gap is used to accommodate the locking structure 8 and is used for the insertion of the antifreeze cover 211. The antifreeze cover 211 is buckled on the top of the second tube body 21. If necessary, the outer wall of the antifreeze cover 211 and the outer wall of the first tube body 11 are mutually attached and crimped, thereby improving the buckling stability. The bottom end of the end plate of the antifreeze cover 211 is provided with a strip hole 2114, and the top end of the locking structure 8 is inserted into the strip hole 2114 (because the top end of the locking structure 8 needs to be at least higher than the floating ice layer 41 and the ground water 4, and the bottom end of the antifreeze cover 211 needs to be inserted into the ground water 4, so the bottom end of the antifreeze cover 211 needs to be lower than the top end of the locking structure 8 at the same position). A sealing strip is provided on the inner wall of the strip-shaped hole 2114 (for example, fixed by bonding), and the sealing strip is crimped between the strip-shaped hole 2114 and the locking structure 8, thereby improving the sealing between the antifreeze cover 211 and the locking structure 8.

[0069] Reference Figure 7 and Fig.13 The strip hole 2114 is buckled at the connection position between the first tube body 11 and the female opening 81, so that the distance between the end plate and the second tube body 21 is as large as possible, thereby increasing the width of the insulation gap 212 and improving the insulation performance.

[0070] There are a plurality of antifreeze shells 211 which are nested and connected with each other. When the antifreeze shells 211 are nested with each other, a multi-layer heat-insulating ice layer is formed, thereby enhancing the heat-insulating performance of the warm-keeping gap.

[0071] The present invention has a simple structure and reliable functions. The first pipe pile 1 and the second pipe pile 2 are surrounded in a closed ring to form a cofferdam for stopping the ground water 4, thereby preventing the unfinished bridge from being eroded by the ground water 4, so that the present invention can operate in an environment rich in ground water 4; after the drainage module 3 pumps out the ground water 6, it is discharged through the inner cavity of the antifreeze cover 211 and the bottom of the ground water 4, avoiding direct contact between the drainage module 3 and the external cold air and the floating ice layer 41, thereby avoiding the problem of the pumped ground water 6 being frozen, so that the present invention can operate in a low-temperature environment; compared with traditional technologies, the compatibility of the present invention with the construction environment is greatly improved.

[0072] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0073] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] To sum up, for those skilled in the art, according to the guidance of the present invention, without departing from the principles and spirit of the present invention, the changes, modifications, substitutions and deformations made to the present invention still fall within the protection scope of the present invention.

Claims

1. A pipe pile system used for a precipitation well and a cofferdam, characterized in that: It comprises a first pipe pile (1), a second pipe pile (2) and a drainage module (3); The first pipe pile (1) and the second pipe pile (2) are arranged in a closed ring shape to form a cofferdam for blocking ground water (4); The second pipe pile (2) comprises a second pipe body (21) and an extension portion (22) connected to and in communication with the bottom end of the second pipe body (21); a water-permeable hole for infiltrating groundwater (6) is provided on a side wall of the extension portion (22); the extension portion (22) is a cylindrical structure; The drainage module (3) comprises a submersible pump (31), a first lifting pipe (32), a connecting pipe (33) and a second lifting pipe (34); the submersible pump (31) is arranged in the inner cavity of the extension portion (22); the first lifting pipe (32), the connecting pipe (33) and the second lifting pipe (34) are sequentially connected and connected; the first lifting pipe (32) is buckled in an n-shaped manner on the side wall of the second pipe pile (2); one end of the first lifting pipe (32) is connected and connected to the submersible pump (31), and the other end is arranged at the bottom of the ground water (4); the connecting pipe (33) is arranged at the bottom of the ground water (4) to prevent freezing; the second lifting pipe (34) is connected to the water reservoir (7); An antifreeze cover (211) is buckled at the top end of the second tube body (21), a heat-insulating gap (212) is provided between the antifreeze cover (211) and the second tube body (21), and the first riser (32) comprises a top end bent portion (321) arranged in the heat-insulating gap (212) to prevent freezing.

2. The pipe pile system used for the precipitation well and the cofferdam according to claim 1 is characterized in that: The bottom end of the antifreeze cover (211) is inserted into the ground water (4) to close the thermal insulation gap (212); the bottom end of the antifreeze cover (211) is located below the floating ice layer (41).

3. The pipe pile system used for the precipitation well and the cofferdam according to claim 2 is characterized in that: The first lifting pipe (32) further comprises a first riser portion (322) and a second riser portion (323) respectively connected to and in communication with both ends of the top bending portion (321); the first riser portion (322) is longitudinally arranged in the inner cavity of the second pipe pile (2), and the second riser portion (323) is longitudinally arranged at the outer wall of the second pipe pile (2).

4. The pipe pile system used for the drainage well and the cofferdam according to claim 3 is characterized in that: The antifreeze housing (211) is provided with a thermal insulation ice layer formed by freezing liquid water and a receiving cavity (2111) for receiving the thermal insulation ice layer.

5. The pipe pile system used for the precipitation well and the cofferdam according to claim 4 is characterized in that: The vertical cross-section of the accommodating cavity (2111) is in the shape of an N.

6. The pipe pile system used for the precipitation well and the cofferdam according to claim 5 is characterized in that: The antifreeze cover (211) can be turned over to face the opening upward, thereby facilitating the injection of the liquid water.

7. The pipe pile system used for the precipitation well and the cofferdam according to claim 6 is characterized in that: A support assembly (23) for supporting the antifreeze cover shell (211) is provided at the top end of the second tube body (21); the support assembly (23) is detachably connected to the second tube body (21), and the antifreeze cover shell (211) is detachably crimped to the support assembly (23).

8. The pipe pile system used for the precipitation well and the cofferdam according to claim 7 is characterized in that: An electrically controlled liquid level meter (24) is provided in the thermal insulation gap (212), and the electrically controlled liquid level meter (24) is used to monitor the liquid level in the thermal insulation gap (212) to prevent the ground water (4) from flowing into the second pipe pile (2); the electrically controlled liquid level meter (24) is connected to an alarm system via an external monitoring device.

9. The pipe pile system used for the precipitation well and the cofferdam according to claim 8, characterized in that: A side pit (71) is provided on the side wall of the water reservoir (7), and a compensating water pump (72) connected to and in communication with the second lifting pipe (34) is arranged in the side pit (71); a sealing plate (73) that can be opened and closed is provided at the top opening of the water reservoir (7) to prevent the compensating water pump (72) from freezing.

10. A construction method for a pipe pile system, characterized in that: The steps of constructing the pipe pile system shared by the precipitation well and the cofferdam as described in claim 9 include: S1, drilling; S2, lowering the first pipe pile (1) and the second pipe pile (2) to the bottom of the hole respectively; S3, installing the drainage module (3); S4, installing the support assembly (23) on the top end of the second tube body (21); S5, taking the antifreeze cover (211) and turning it over to a state with the opening facing upward, injecting the liquid water into the accommodating cavity (2111); after the liquid water freezes into ice, buckling the antifreeze cover (211) onto the top end of the second tube body (21).

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