A pipe pile system and construction method shared by a dewatering well and a cofferdam

Abstract

The present invention discloses a pipe pile system and construction method shared by a precipitation well and a cofferdam, and relates to the technical field of steel pipe piles. The pipe pile system shared by the precipitation well and the cofferdam includes a first pipe pile, a second pipe pile, and a drainage module; the first pipe pile and the second pipe pile are surrounded in a closed ring to form a cofferdam; the second pipe pile includes a second pipe body and an extension, and the side wall of the extension is provided with a water-permeable hole. The drainage module includes a submersible pump, a first lifting pipe, a connecting pipe, and a second lifting pipe; the first lifting pipe is buckled in an η-shaped position on the side wall of the second pipe pile, and the connecting pipe is arranged at the bottom of the ground water to avoid freezing; an antifreeze cover is buckled at the top of the second pipe body, and an insulating gap is provided between the antifreeze cover and the second pipe body. After the drainage module pumps out the groundwater, it is discharged through the inner cavity of the antifreeze cover and the bottom of the ground water, avoiding direct contact between the drainage module and the external cold air and floating ice layer, and preventing the pumped groundwater from freezing, so that the present invention can operate in a low-temperature environment, and its compatibility is greatly improved.

Description

Technical Field

[0001] The present 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 constructing bridges (such as cable-stayed bridges) in environments such as swamps, lakes, rivers, and oceans, it is necessary to lay cofferdams to block groundwater outside the construction site to prevent groundwater from adversely affecting the construction of the bridge (such as foundations, load-bearing columns, etc.); then, it is necessary to build sedimentation wells around the cofferdams to lower the groundwater level to prevent groundwater from adversely affecting the construction of the bridge, thereby improving construction safety and quality.

[0003] The Chinese patent "A pipe pile structure that also serves as a dewatering well" (publication number: CN 208803479 U) discloses a technical solution that uses support pipe piles as dewatering wells. However, it is difficult to be compatible with construction environments rich in groundwater. Moreover, when operating in a low-temperature environment, the groundwater pumped above the ground will freeze, resulting in the blockage 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 in the above background technology that "the technical solution of using pipe piles as dewatering wells in traditional technology has poor environmental compatibility", the present invention provides a pipe pile system and construction method shared by dewatering wells and cofferdams.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A pipe pile system shared by 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 groundwater; the second pipe pile comprises a second pipe body and an extension portion connected to and communicated with the bottom end of the second pipe body, the side wall of the extension portion is provided with a water permeable hole for infiltrating groundwater; the extension portion is a cylindrical structure; the drainage module comprises a submersible pump, a first riser, a connecting pipe and a second riser; the submersible pump is arranged in the inner cavity of the extension portion; the first riser, the connecting pipe and the second riser are connected and communicated in sequence; the first riser is buckled in an n-shaped position on the side wall of the second pipe pile, one end of the first riser is connected to and communicated with the submersible pump, and the other end is arranged at the bottom of the groundwater, the connecting pipe is arranged at the bottom of the groundwater to prevent freezing; the second riser is connected to a water reservoir; an antifreeze cover is buckled at the top of the second pipe body, an insulation gap is provided between the antifreeze cover and the second pipe body, and the first riser includes a top bending portion arranged in the insulation gap to prevent freezing.

[0007] 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.

[0008] As a further optimization solution of the present invention, the first rising pipe also includes a first riser portion and a second riser portion respectively connected and communicated with the two 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 on the outer wall of the second pipe pile.

[0009] 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.

[0010] As a further optimization solution of the present invention, the vertical cross-section of the accommodating cavity is n-shaped.

[0011] 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.

[0012] As a further optimization solution of the present invention, a support assembly for supporting the antifreeze cover 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 is detachably crimped to the support assembly.

[0013] As a further optimization scheme of the present invention, an electric liquid level gauge is provided in the insulation gap, and the electric 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 electric liquid level gauge is connected to the alarm system through an external monitoring device.

[0014] As a further optimization scheme of the present invention, a side pit is provided on the side wall of the water reservoir, and a compensation water pump connected to and communicated with the second lifting pipe is installed 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 compensation water pump from freezing.

[0015] A construction method for a pipe pile system, namely, 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-up state, and 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.

[0016] In summary, the present invention has at least one of the following advantages:

[0017] (1) The present invention has a simple structure and reliable functions. The first pipe pile and the second pipe pile are arranged in a closed ring to form a cofferdam for stopping groundwater, thereby preventing the unfinished cable-stayed bridge from being eroded by groundwater, so that the present invention can operate in an environment rich in groundwater. After the drainage module pumps out the groundwater, it is discharged through the inner cavity of the antifreeze cover and the bottom of the groundwater, avoiding direct contact between the drainage module and the external cold air and floating ice layer, thereby avoiding the problem of the pumped groundwater 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.

[0018] (2) The antifreeze cover is buckled on the top of the second pipe body, and the bottom of the antifreeze cover is inserted into the ground water after passing through the floating ice layer, 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 world, reducing the heat loss of the air near the first lifting pipe, and achieving insulation of the extracted groundwater.

[0019] (3) An insulating ice layer is provided inside the antifreeze cover, which is used to increase the thickness of the antifreeze cover, thereby reducing the heat loss rate of the air in the insulation 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.

[0020] (4) After turning over the antifreeze cover, pour ground water into the accommodating 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.

[0021] (5) The antifreeze cover and the floating ice layer freeze to each other. When the water level of the ground water 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.

[0022] (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.

[0023] (7) An electric liquid level gauge is installed in the insulation gap to monitor the liquid level, so as 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 the water nearby will not freeze, 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 surface water level in the insulation gap will not generate waves, so that the electric liquid level gauge can monitor and obtain relatively stable and accurate data. The ground water inside the antifreeze cover has low fluidity, which can prevent the water from eroding the electric liquid level gauge. Therefore, the use of a longer electric liquid level gauge will not cause bending and deformation.

[0024] (8) The top of the electric control liquid level gauge is inserted and fixed in the limit fin of the support assembly, so that the lower part of the electric control liquid level gauge is in a suspended state, which can prevent the side wall of the electric control liquid level gauge from contacting the antifreeze cover, thereby preventing the electric control liquid level gauge from being frozen. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further described below with reference to the accompanying drawings:

[0026] Figure 1 It is a front view schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic top view of the overall structure of the present invention;

[0028] Figure 3 Schematic diagram of the front view of the structure of the first pipe pile and the second pipe pile;

[0029] Figure 4 Schematic diagram of the structure of the second tube body and the extension part;

[0030] Figure 5 This is a schematic diagram of the location and structure of the drainage module;

[0031] Figure 6 Schematic diagram of the position and structure of the first riser;

[0032] Figure 7 This is a schematic diagram of the vertical cross-section structure of the antifreeze cover with the opening facing upward;

[0033] Figure 8 This is a schematic diagram of the installation position of the electronically controlled liquid level gauge;

[0034] Figure 9 Schematic diagram of the supporting component structure;

[0035] Figure 10 Schematic diagram of the position and structure of the first protrusion and the second protrusion;

[0036] Figure 11 A schematic diagram of the location of the vent holes;

[0037] Figure 12 It is a cross-sectional top view of the first tube body and the second tube body connected by the locking structure;

[0038] Figure 13 It is a cross-sectional top view of adjacent first tubes connected via a locking structure.

[0039] Description of reference numerals:

[0040] In the figure,

[0041] 1. The first pipe pile; 11. The first pipe body;

[0042] 2. Second pipe pile; 21. Second pipe body; 211. Antifreeze cover; 2111. Accommodation cavity; 2112. Support column; 2113. Vent 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;

[0043] 3. Drainage module; 31. Submersible pump; 32. First riser; 321. Top bend; 322. First riser; 323. Second riser; 33. Connecting pipe; 34. Second riser.

[0044] 4. Ground water; 41. Ice layer;

[0045] 5. Rock and soil layer;

[0046] 6. Groundwater;

[0047] 7. Water reservoir; 71. Side pit; 72. Compensating water pump; 73. Sealing plate;

[0048] 8. Locking structure; 81. Female end; 82. Male end; 83. Canvas bag; 84. Mortar. DETAILED DESCRIPTION

[0049] Based on the above structural features of the present application, the implementation methods of the present application are further described:

[0050] Reference Figures 1 and 2 This embodiment provides a pipe pile system shared by a dewatering well and a cofferdam, comprising 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 portions of the first pipe piles 1 and the lower portions of the second pipe piles 2 are both inserted into the rock and soil layer 5, and the first pipe piles 1 and the second pipe piles 2 are arranged in a closed ring to form a cofferdam for blocking groundwater 4. The load-bearing columns of the cable-stayed bridge are constructed on the inner side of the cofferdam, and the groundwater 4 is blocked on the outer side of the cofferdam, thereby preventing the groundwater 4 from interfering with the construction of the load-bearing columns.

[0051] 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 4The second pipe pile 2 includes 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. The inner cavity of the second pipe body 21 and the inner cavity of the extension portion 22 are interconnected, thereby being used to drain groundwater 6. The second pipe pile 2 is a spiral welded pipe structure; the second pipe body 21 and the extension portion 22 are coaxially arranged and fixedly connected (for example, through an integrated and welded fixed connection). The side wall of the extension portion 22 is provided with a water-permeable hole for infiltrating groundwater 6; the groundwater 6 in the rock and soil layer 5 flows into the inner cavity of the extension portion 22 through the water-permeable hole, and is then discharged through the drainage module 3, thereby effectively lowering the water level of the groundwater 6 and reducing the water content of the rock and soil layer 5 inside the cofferdam, thereby preventing the groundwater 6 from interfering with the construction of the cable-stayed bridge (the load-bearing columns).

[0052] The extension portion 22 is a cylindrical structure. The first pipe pile 1 and the second pipe pile 2 are both cylindrical structures.

[0053] An isolation net is provided on the outer or inner wall of the extension 22 to prevent mud and gravel from clogging the water permeable holes. When the isolation net is provided on the outer wall of the extension 22, it is a multi-layer plastic mesh, wrapped around the outer wall of the extension 22 and secured with wire or rope. When the isolation net is provided on the inner wall of the extension 22, it is a structure composed of a superimposed multi-layer plastic mesh and a multi-layer sponge mesh, which is crimped onto the inner wall of the extension 22 using an inner support ring. The outer wall of the inner support ring and the inner wall of the extension 22 respectively squeeze the edges of the isolation net from both the inner and outer sides, and the inner support ring and the extension 22 are fixedly connected by bolts.

[0054] The bottom of the extension 22 is sealed to prevent mud and sand from entering the extension 22 and clogging the submersible pump 31. A metal bottom plate is installed at the bottom of the extension 22, which is sealed and fixed to the sidewalls of the extension 22 (for example, by bolts and a sealing ring or by welding). Alternatively, an isolation net can be wrapped around the bottom of the extension 22 from the inside or outside to achieve a seal.

[0055] Reference Figure 5The drainage module 3 includes a submersible pump 31, a first riser pipe 32, a connecting pipe 33, and a second riser pipe 34. The submersible pump 31 is located within the extension 22. The first riser pipe 32, connecting pipe 33, and second riser pipe 34 are sequentially connected and interconnected. The first riser pipe 32 is mounted in an n-shaped configuration on the sidewall of the second pile 2. One end of the first riser pipe 32 is connected to and interconnected with the submersible pump 31, and the other end is located at the bottom of the surface water 4. The connecting pipe 33 is located at the bottom of the surface water 4 and within the rock and soil layer 5 to prevent freezing. (The floating ice layer 41 is located above the surface water 4, providing insulation for the middle and bottom portions of the surface water 4.) The second riser pipe 34 is buried within the rock and soil layer 5 and is positioned vertically. It is connected to the water reservoir 7. The drainage module 3 can pump out groundwater 6 that has seeped into the extension 22 and then discharge it into the water reservoir 7. This prevents freezing of the groundwater 6 during transportation, ensuring smooth 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.

[0056] Reference Figure 5 and Figure 6 The second tube body 21 is provided with an antifreeze cover 211 at the top end, with an insulation gap 212 defined between the antifreeze cover 211 and the second tube body 21. The first riser 32 includes a top bend 321 positioned within the insulation gap 212 to prevent freezing. The antifreeze cover 211 prevents the second pipe pile 2 and the top bend 321 from being directly exposed to the outside air (i.e., preventing contact and convection with the outside air), thereby achieving a thermal insulation effect and preventing freezing. Although heat within the insulation gap 212 is continuously dissipated to the outside, the groundwater 6 contains geothermal energy and remains in an unfrozen state. Therefore, when the groundwater 6 is drawn through the insulation gap 212, it can compensate for the heat in the insulation gap 212. At the same time, the geothermal energy contained in the rock layer 5 and the groundwater 6 continuously overflows through the inner cavity of the second pipe pile 2 (via air), simultaneously achieving heat compensation for the insulation gap 212.

[0057] Reference Figure 5 The bottom end of antifreeze cover 211 is inserted into groundwater 4 to seal insulation gap 212, preventing air inside insulation gap 212 from contacting / convection with the outside air, thereby slowing heat loss from insulation gap 212. The bottom end of 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 antifreeze cover 211 gradually freezes, thereby improving the sealing of insulation gap 212.

[0058] Reference Figure 5 and Figure 6The first riser 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. 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 on the outer wall of the second pipe pile 2, thereby realizing the discharge of groundwater 6.

[0059] Reference Figure 5 and Figure 6 Because the ends of the top bend 321 bear the weight of the first and second riser sections 322 and 323, respectively, to prevent the top bend 321 from being flattened and blocked at the point where it meets the second tube 21, it is necessary to either use a hard material (such as stainless steel, titanium alloy, or other rust-resistant material) to manufacture the top bend 321, or install a bracket at the top end of the second tube 21. The bracket is connected to the outer wall of the first riser section 322, thereby supporting the weight of the first riser section 322. Brackets used to secure tubular structures within wells are conventional in the industry and will not be described in detail here.

[0060] Reference Figure 5 and Figure 6 If necessary, electric heating wires are wound around the outer surface of the top bend 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 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 bend portion 321, the first vertical pipe portion 322, and the second vertical pipe portion 323.

[0061] Reference Figure 5 and Figure 6 The second riser portion 323 does not contact the antifreeze housing 211, thereby preventing direct heat conduction between the second riser portion 323 and the antifreeze housing 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 wrapping or hooping with wire, binding tape, or a hoop), thereby keeping the second riser portion 323 as far away from the antifreeze housing 211 as possible.

[0062] Reference Figure 5 and Figure 7The antifreeze housing 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 cross-section of the receiving chamber 2111 is n-shaped. The antifreeze housing 211 has an n-shaped vertical cross-section. The antifreeze housing 211 has a double-wall structure, and the double walls are fixedly connected by support columns 2112 (for example, through an integrated fixed connection). The support columns 2112 support the receiving chamber 2111. During use, the insulating ice layer can insulate 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 costs of the antifreeze housing 211.

[0063] 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 water without contact with 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).

[0064] Reference Figure 7 The antifreeze cover 211 can be flipped to an upward-facing position, making it easier for users to inject liquid water into the receiving chamber 2111. The opening of the receiving chamber 2111 is located at the end of the antifreeze cover 211. When the antifreeze cover 211 is flipped to an upward-facing position, the opening of the receiving chamber 2111 faces upward, facilitating the injection of liquid water. Liquid water can be directly obtained from groundwater 4, thus achieving local material resources and improving construction and transportation convenience.

[0065] Reference Figure 8 A support assembly 23 for supporting the antifreeze cover 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 cover 211 and the support assembly 23 are detachably crimped, thereby facilitating the loading and unloading of the support assembly 23 and the antifreeze cover 211.

[0066] Reference Figure 8 and Figure 9The support assembly 23 includes an inner tube 231 and a limiting fin 232. The lower portion 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 portion of the inner tube 231 is stably inserted into the top end 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 portion of the inner tube 231 is inserted into the inner cavity of the second tube body 21, the limiting fin 232 is pressed against the top end 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 211 is pressed against the top surface of the inner tube 231, thereby achieving high support of the antifreeze cover 211 by the support assembly 23, avoiding the problem of the antifreeze cover 211 contacting and compressing the top bending part 321, and at the same time keeping a certain distance between the top surface of the antifreeze cover 211 and the top bending part 321, thereby improving the thermal insulation performance of the thermal insulation gap 212.

[0067] Reference Figure 10 A small number (e.g., three) of first protrusions 2321 are provided on the outer wall of the limiting fin 232. These first protrusions 2321 are arranged in a circular array at equal intervals and angles on the outer wall of the limiting fin 232 (e.g., through an integral 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 rate. The first protrusions 2321 extend outward.

[0068] Reference Figure 10 A small number (e.g., three) of second protrusions 2331 are provided on the top surface of the inner cylinder 231. These 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 integral fixed connection). The second protrusions 2331 abut between the limiting fins 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 rate. The second protrusions 2331 extend upward.

[0069] After the present invention is installed, the floating ice layer 41 will freeze with the antifreeze shell 211, thereby preventing the antifreeze shell 211 from accidentally falling off from the support assembly 23, and having excellent structural stability.

[0070] Reference Figure 8 、 Figure 9 and Figure 10 A notch 233 is provided on the upper part 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.

[0071] 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 heat exchange between the support assembly 23 and the first rising pipe 32.

[0072] Reference Figure 8 A vertical electric-controlled liquid level gauge 24 is provided in the insulation gap 212. 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 surface 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 groundwater 6 in the second pipe pile 2 continues to drop, if the sealing performance of 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 surface water 4 in the insulation gap 212 to continue to rise, further causing the surface 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. The electric-controlled liquid level gauge 24 has a built-in wireless signal transmitter that can transmit the collected liquid level signal in real time to an external monitoring device (such as an external mobile phone, computer, or other computing device with a built-in signal receiving device). The external monitoring device compares the received liquid level signal data with the built-in preset data 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.

[0073] Reference Figure 8 and Figure 9 The top end of the electronically controlled liquid level gauge 24 is inserted into the limiting fin 232 of the support assembly 23 and fixedly connected (for example, by bolts). The electronically controlled liquid level gauge 24 is positioned in the middle of one side of the thermal insulation gap 212, thereby preventing the side wall of the electronically controlled liquid level gauge 24 from contacting the antifreeze housing 211. (Direct contact between the side walls of the electronically controlled liquid level gauge 24 and the antifreeze housing 211 creates a risk of mutual freezing; freezing of the electronically controlled liquid level gauge 24, especially the electronically controlled float level gauge, can lead to functional failure.) The surface water 4 outside the antifreeze housing 211 will generate waves due to wind or its own flow rate. However, the surface water 4 within the antifreeze housing 211, that is, within the thermal insulation gap 212, is blocked by the side walls of the antifreeze housing 211 and does not generate waves. This ensures that the electronically controlled liquid level gauge 24 has higher measurement accuracy and does not detect dynamic data.

[0074] Reference Figure 8 and Figure 9 The limiting fins 232 limit the antifreeze cover 211 to prevent the antifreeze cover 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 cover 211 has a tendency to shake laterally).

[0075] When the user receives the alarm, he / she 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.

[0076] Reference Figure 11 Vent holes 2113 are provided at corresponding locations on the inner and outer walls of antifreeze cover 211, communicating with chamber 2111. A user inserts an electric drill bit into vent hole 2113 and drills through the insulating ice layer. The drill bit is then removed, connecting the inside and outside of antifreeze cover 211. The liquid level within insulating gap 212 gradually drops. If necessary, positive pressure gas can be injected into insulating gap 212 through vent hole 2113 to minimize the liquid level within insulating gap 212 and reduce the frequency of maintenance work.

[0077] When positive pressure gas is required, this can be achieved using an air pump or a gas cylinder containing high-pressure gas. The air pump and gas cylinder are each connected to a gas pipe, the end of which is fitted with a gas nozzle that fits into vent 2113. Liquid water is sprayed between the gas nozzle and vent 2113 until the liquid water freezes, sealing the gas nozzle and vent 2113. If the gas nozzle is made of metal, heating it (for example, with an open flame or electric heating rod) can melt the ice around it, allowing it to be removed. If the degree of freezing is relatively light, the gas nozzle can be directly pulled out or lifted out.

[0078] Reference Figure 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 at 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. During the next maintenance, use the drill bit of the electric drill to drill through the icicle again, thereby opening the vent 2113. When the icicle is pushed by the internal air pressure and cannot be stably inserted into the vent 2113 until the liquid water freezes, 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.

[0079] Reference Figure 11 and Figure 7 Due 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.

[0080] Reference Figure 5, a side pit 71 is provided on the side wall of the water reservoir 7, which is located in the upper middle part of the side wall of the water reservoir 7. A compensation water pump 72 is provided in the side pit 71, which is connected to and communicated with the second lifting pipe 34, and the drainage pipe of the compensation water pump 72 points to the inner cavity of the water reservoir 7. The compensation 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 compensation 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 groundwater 4 / connecting pipe 33, so as to facilitate the later discharge or extraction of water in the water reservoir 7.

[0081] Reference Figure 5 The water reservoir 7 is built on a hillside near the groundwater 4, or an isolation (such as a retaining wall) is set between the groundwater 4 and the water reservoir 7 to prevent the groundwater 4 from flowing into the water reservoir 7.

[0082] 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 keeping the water reservoir 7 warm and preventing the compensating water pump 72 from freezing and causing it to be unable to discharge water.

[0083] A method for constructing a pipe pile system, that is, the steps of constructing a pipe pile system shared by a dewatering well and a cofferdam include:

[0084] 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.

[0085] S2. Lower the first pipe pile 1 and the second pipe pile 2 to the bottom of the hole respectively, and use fillers (such as underwater concrete) to fill the gap between the first pipe pile 1 and the hole and the gap between the second pipe pile 2 and the hole to achieve stable installation of the first pipe pile 1 and the second pipe pile 2.

[0086] S3. Install drainage module 3.

[0087] S4. Install (plug) the support assembly 23 on the top of the second tube body 21.

[0088] 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 21 .

[0089] Step S3 involves lowering the submersible pump 31 and deploying the first riser 32, connecting pipe 33, and second riser 34. The use of a winch facilitates the lowering of the submersible pump 31 and first riser 322, a conventional technique in the industry and will not be described in detail. The deployment of the first riser 32, connecting pipe 33, and second riser 34 is also conventional in the industry and will not be described in detail.

[0090] Reference Figure 12 and Figure 13 , a locking structure 8 is used to achieve a sealed connection between adjacent first tube bodies 11 and second tube bodies 21, as well as between two adjacent first tube bodies 11, thereby preventing water leakage in the cofferdam. The locking structure 8 includes a female opening 81, a male opening 82, a canvas bag 83, and mortar 84. The cross section of the female opening 81 is C-shaped, and 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. 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, thereby achieving a seal. When the locking structure 8 is used to seal the connection between the adjacent first tube bodies 11 and the second tube bodies 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, by welding for sealing and fixing). 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 (eg, sealed and fixedly connected by welding).

[0091] A gravel filter layer is provided 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.

[0092] The submersible pump 31 , the electronically controlled liquid level gauge 24 and the electric heating wire are respectively connected to wires, which pass through the insulation gap 212 and are connected to an external power supply (such as a temporary power supply system, a vehicle / ship-mounted power supply, etc.).

[0093] The antifreeze cover 211 and the floating ice layer 41 freeze together. When the surface water level 4 rises, the floating ice layer 41 is pushed upward, further driving the antifreeze cover 211 upward. To prevent the antifreeze cover 211 from dislodging from the top of the second tube 21, a steel chain connects the bottom end of the antifreeze cover 211 to the side wall of the second tube 21. When the surface water level 4 is low, the steel chain acts as a counterweight for the antifreeze cover 211, pulling the antifreeze cover 211 to be firmly pressed against the support assembly 23. When the surface water level 4 rises, the steel chain tightens and pulls the antifreeze cover 211 downward, preventing the antifreeze cover 211 from floating excessively and becoming detached from the top of the second tube 21. Even if the water level of the surface water 4 rises to cover the antifreeze cover 211 (a circular plate is welded to 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 surface water 4 to flow into the second pipe pile 2. When the water level of the surface 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 surface water 4 to flow into the second pipe pile 2. In this case, 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 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 is detachably connected to the second hanging ring, thereby being 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.

[0094] Reference Figure 7 and Figure 13 There is a receiving gap between adjacent first tube bodies 11 and second tube bodies 21, and between two adjacent first tube bodies 11. The receiving gap is used to accommodate the locking structure 8 and 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 attached to each other and pressed together, 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, 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 hole 2114 (for example, fixed by bonding), and the sealing strip is pressed between the strip hole 2114 and the locking structure 8, thereby improving the sealing between the antifreeze cover 211 and the locking structure 8.

[0095] Reference Figure 7 and Figure 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.

[0096] The antifreeze housings 211 are provided with a plurality of antifreeze housings 211 and are nested and connected to each other. When the antifreeze housings 211 are nested to each other, a multi-layer insulation ice layer is formed, thereby enhancing the heat insulation performance of the warm gap.

[0097] The present invention has a simple structure and reliable functions. The first pipe piles 1 and the second pipe piles 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.

[0098] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0099] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections, or integral connections; mechanical or electrical connections; direct connections or connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0100] 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, changes, modifications, replacements and deformations made to the present invention still fall within the scope of protection of the present invention.

Claims

1. A pipe pile system used for a dewatering well and a cofferdam, characterized by: 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 to form a cofferdam for stopping surface 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 filtering 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 η shape at 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 surface water (4); the connecting pipe (33) is arranged at the bottom of the surface water (4) to avoid freezing; the second lifting pipe (34) is connected to the water reservoir (7); The top end of the second tube body (21) is provided with an antifreeze cover (211), a heat preservation gap (212) is provided between the antifreeze cover (211) and the second tube body (21), and the first riser (32) includes a top bending portion (321) provided in the heat preservation gap (212) to prevent freezing; 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.

2. The pipe pile system used for the dewatering 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 shared by the dewatering 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 on the outer wall of the second pipe pile (2).

4. The pipe pile system used for the dewatering well and the cofferdam according to claim 3 is characterized in that: The vertical cross-section of the accommodating cavity (2111) is in the shape of an N.

5. The pipe pile system used for the dewatering well and the cofferdam according to claim 4 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.

6. The pipe pile system used for the dewatering well and the cofferdam according to claim 5 is characterized in that: A support assembly (23) for supporting the antifreeze cover (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 (211) is detachably crimped to the support assembly (23).

7. The pipe pile system used for the dewatering well and the cofferdam according to claim 6 is characterized in that: An electric-controlled liquid level gauge (24) is provided in the thermal insulation gap (212), and the electric-controlled liquid level gauge (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 electric-controlled liquid level gauge (24) is connected to an alarm system via an external monitoring device.

8. The pipe pile system used for the dewatering well and the cofferdam according to claim 7 is characterized in that: A side pit (71) is provided on the side wall of the water reservoir (7), and a compensation water pump (72) connected to and in communication with the second lifting pipe (34) is provided 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 compensation water pump (72) from freezing.

9. A construction method for a pipe pile system, characterized in that: The steps of constructing the pipe pile system shared by the dewatering well and the cofferdam as described in claim 8 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 (21); S5. Take the antifreeze cover (211) and turn it over to a state with the opening facing upward, and inject the liquid water into the accommodating cavity (2111); after the liquid water freezes into ice, buckle the antifreeze cover (211) onto the top end of the second tube (21).

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