Construction method of pump room well in communication channel

Abstract

The present invention provides a method for constructing a pump room well in a communication channel, which can improve the sealing performance between a pump room well pipe and a bottom seal, thereby reducing the risk of water and sand gushing accidents during the construction of the pump room well in the communication channel, and improving the safety of the pump room well construction in the communication channel, and relates to the technical field of vertical shaft construction. The method for constructing a pump room well in a communication channel comprises: setting a downward opening on the lining at the construction position of the pump room well of the communication channel, and setting an orifice pipe with a blowout prevention device in the opening; passing the nozzle of the rotary jetting equipment through the orifice pipe downward into the soil to a required depth, and using the nozzle to cut the soil to form a concrete block as the bottom seal of the pump room well; pushing a prefabricated pump room well pipe with an outer diameter smaller than the bottom seal diameter downward, so that the lower end of the pump room well pipe penetrates the lining and extends into the bottom seal, so as to cooperate with the bottom seal to form a pump room well water leakage prevention structure.

Description

Technical Field

[0001] The invention relates to the technical field of vertical shaft construction, and in particular to a method for constructing a pump room shaft in a communication channel. Background Art

[0002] The communication channel is a connecting channel set up between two tunnels for the evacuation of personnel in an emergency; the pump house is located at the lowest point of the interval tunnel and is used for tunnel drainage. In order to reduce the scale of the project, the pump house is generally set up in the communication channel, and the vertical pump house well is excavated after the horizontal channel of the communication channel is constructed. Since the communication channel itself is buried deep, the water and soil pressure at its location is large, and the clearance in the communication channel is small, if the pump house well is constructed in the communication channel, in order to achieve the water storage capacity required by the specification, it is necessary to greatly increase the depth of the pump house well. Therefore, the water and soil pressure on the pump house well is even greater when the pump house well is excavated vertically at the communication channel. How to solve the water pressure problem under complex geological conditions is a key process to control the risks of pump house well construction. If you are not careful, accidents such as water and sand gushing and soil instability may occur.

[0003] The patent with application number CN201911214879.9 discloses a pump room construction method and a pump room construction dewatering system in a tunnel connecting channel. This method uses the grouting method to first reinforce the soil of the tunnel connecting channel, and then dig a dewatering well in the area to be excavated for the pump room well on the ground of the connecting channel, and then lower a filter cartridge into the dewatering well. A water pump is placed in the filter cartridge to divert the accumulated water in the dewatering well to the outside of the dewatering well, so as to facilitate the excavation and construction of the pump room well. Finally, the pump room well is excavated and concrete is poured into the pump room well. This construction method mainly relies on dewatering wells to lower the water level to below the foundation pit surface, and then provides soil strength within the foundation pit through grouting reinforcement. However, the pump house well is located at the lowest point of the tunnel, with a large burial depth and high water pressure. The dewatering well cannot lower the water level below the pump house floor elevation, and large-scale precipitation will cause soil instability around the communication channel, and the quality of grouting reinforcement in the tunnel is difficult to control. The risk of pump house excavation under complex geological conditions cannot be controlled under this scheme, and it is difficult to apply in actual projects.

[0004] The patent with application number CN202011461230.X proposes a mechanized method for sealing the bottom of a vertical shaft in a tunnel, which uses a prefabricated pump house well pipe and sealing concrete to form a construction space for the vertical shaft. The pressure resistance and sealing of the pump house well pipe are better than those of the grouting soil, and no dewatering is required. However, on the one hand, this method uses a pipe jacking machine for excavation, and the equipment is large in scale. The pump house can only be constructed in the main line tunnel, and it is impossible to construct the pump house in the connecting channel with a small clearance. The newly added pump house under the main line tunnel will cause a difference in the foundation stiffness of the tunnel structure before and after the pump house. The long-term operation of the train is prone to differential settlement, which affects the driving safety. At the same time, the original right line shared a pump house, which now needs to be increased to two pump house wells, increasing the scale of the project; on the other hand, even if it is feasible to use a pipe jacking machine to construct a pump house well in the connecting channel, the sealing concrete of this method is located on the inner side of the pump house well pipe, and it is difficult to achieve close contact between the two, and it is difficult to resist the external water and soil pressure by the friction between the concrete and the wellbore alone. When used for the construction of the pump house well in the connecting channel. It is subject to greater water and soil pressure, especially under complex address conditions. For example, if the pump room is located in a water-rich sand layer, it is more likely for water and sand to gushed out between the bottom concrete and the pump room shaft pipe. When the jacking cutter head is withdrawn, since the bottom concrete has no heavy load, sudden gushing accidents are likely to occur, posing a major safety hazard. In addition, during the construction of the pump room shaft pipe, this method requires timely discharge of mud generated during the advancement of the cutter head, which can also easily cause soil instability around the communication channel. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for constructing a pump room well in a communicating channel, which can improve the sealing between the pump room well pipe and the bottom seal, thereby reducing the risk of water and sand gushing accidents during the construction of the pump room well in the communicating channel, and improving the safety of the pump room well construction in the communicating channel.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a construction method for a pump room well in a communication channel, the construction method comprising:

[0007] Step 1: construct the communication channel and set up lining in the communication channel;

[0008] Step 2: a downward opening is provided on the lining of the pump house well construction position of the communication channel, and an orifice pipe with a blowout prevention device is provided in the opening;

[0009] Step 3, setting up a rotary grouting device, inserting a nozzle of the rotary grouting device through the orifice pipe downward into the soil to a required depth, and using the nozzle to cut the soil to form a concrete block as a bottom seal of the pump room well;

[0010] Step 4: withdraw the nozzle and seal the opening;

[0011] Step 5, pushing a prefabricated pump room well pipe tube with an outer diameter smaller than the bottom seal diameter downward at the construction position of the pump room well of the communication channel, so that the lower end of the pump room well pipe tube penetrates the lining and extends into the bottom seal to cooperate with the bottom seal to form a pump room well water leakage prevention structure, wherein the part separated from the lining when the lower end of the pump room well pipe tube penetrates the lining is the pump room well lining part, and in the process of pushing the pump room well pipe tube downward, the pump room well lining part is pressed;

[0012] Step 6: waterproofing the space between the upper end of the pump room well tube and the lining, and connecting the upper end of the pump room well tube to the lining, so that the pump room well tube and the lining are connected as a whole;

[0013] Step 7: remove the lining part of the pump room well and the soil inside the pump room well pipe, and construct a concrete retaining wall inside the pump room well pipe as a secondary lining.

[0014] Furthermore, the pump room well pipe barrel comprises a plurality of pump room well pipe sections. When the pump room well pipe barrel is pushed downward at the construction position of the pump room well of the communication channel, the pump room well pipe sections are pushed downward in sequence so that the pump room well pipe sections are connected end to end in sequence and sealed to form the pump room well pipe barrel.

[0015] Further, pushing downward a pump house well pipe having an outer diameter smaller than the bottom diameter at the construction position of the pump house well of the communication channel comprises:

[0016] A lifting mechanism is arranged above the construction position of the pump room well of the communication channel, and a horizontal rotation driving device is installed at the lower end of the lifting mechanism;

[0017] A sawtooth structure is provided at the lower end of the pump room well tube;

[0018] The upper end of the pump room well pipe is connected to the driving shaft of a horizontal rotation driving device, the horizontal rotation driving device is used to drive the pump room well pipe to rotate horizontally, and the lifting mechanism is used to push the pump room well pipe downward, so that the sawtooth structure rotates and pushes downward, first cutting the lining, then cutting the soil, and finally cutting the bottom cover, so that the lower end of the pump room well pipe penetrates the lining and extends into the bottom cover.

[0019] Furthermore, between step 4 and step 5, the construction method further comprises the steps of:

[0020] A sealing structure is provided at the construction position of the pump room well of the communication channel, which is used to cooperate with the pump room well pipe tube to prevent water from passing through between the pump room well pipe tube and the lining.

[0021] Further, the sealing structure includes a first sealing ring and a second sealing ring which are concentrically arranged in the lining, the lower ends of the first sealing ring and the second sealing ring are respectively sealed and connected to the lining, the first sealing ring is located outside the second sealing ring, the inner wall of the first sealing ring is provided with a plurality of first annular sealing brushes which are vertically spaced and one end of which abuts against the outer wall of the pump room well pipe barrel, and a first sealing grease cavity is formed between adjacent first annular sealing brushes, the outer wall of the second sealing ring is provided with a plurality of second annular sealing brushes which are vertically spaced and one end of which abuts against the inner wall of the pump room well pipe barrel, and a second sealing grease cavity is formed between adjacent second annular sealing brushes;

[0022] When the pump room well tube is pushed downward, grease is filled into the first sealing grease cavity and the second sealing grease cavity, and the grease is used to achieve sealing cooperation with the pump room well tube.

[0023] Furthermore, in the process of pushing the pump room well pipe downward, in the step of pressing the lining portion located in the pump room well, a counterweight is added to press the lining portion located in the pump room well.

[0024] Furthermore, the step 1 adopts a mechanical method.

[0025] Furthermore, the pump room well pipe tube is a steel tube or a concrete tube.

[0026] Furthermore, in step seven, when removing the soil inside the pump room well pipe, if water leakage occurs between the pump room well pipe and the bottom seal, it also includes a grouting and sealing step at the penetration point between the pump room well pipe and the bottom seal.

[0027] The beneficial effects of the present invention are:

[0028] The implementation method enables the lower end of the pump room well pipe to be embedded in the bottom seal, and the bottom seal can be better fixed by relying on the pump room well pipe, so that the pump room well pipe and the bottom seal can be closely matched, and the pump room well pipe and the bottom seal have good sealing performance, which solves the problem of poor sealing performance between the pump room well pipe and the bottom seal, and the pressure resistance and sealing performance of the pump room well pipe and the bottom seal are better than those of the grouting soil body. The pump room well water leakage prevention structure formed by this method has good sealing performance and good pressure resistance. This method reduces the risk of water and sand gushing accidents that may occur when constructing a pump room well in a communication channel, especially a communication channel with high water pressure, improves the safety of pump room well construction in the communication channel, and is particularly suitable for construction in a complex construction environment with rich water sand layers;

[0029] The method for constructing a pump room well in a communication channel of the present invention first uses a rotary jet device to penetrate the lining in the communication channel to construct a bottom seal for the pump room well, and then pushes the prefabricated pump room well pipe downward so that the lower end of the pump room well pipe penetrates the communication channel lining and is embedded in the bottom seal to a certain depth, forming a pump room well water-proof structure, thereby isolating the water and soil inside and outside the pump room well pipe, and finally cleaning the soil in the wellbore to complete the construction method of installing the secondary lining structure of the pump room. This construction method basically does not require drainage, soil removal, etc. before forming the pump room well water-proof structure, and the soil in the wellbore is removed afterwards. Due to the effect of the pump room well water-proof structure, it will not affect the soil outside the wellbore. Therefore, this method has little impact on the soil around the communication channel, that is, it is not easy to cause instability of the surrounding soil, and can also improve construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of the construction method of the present invention;

[0031] Figure 2 It is a structural diagram of the communication channel;

[0032] Figures 3 to 6 A schematic diagram of a pump house well constructed according to the method of the present invention;

[0033] Figure 7 This is a schematic diagram of the construction of the pump house well tube;

[0034] Figure 8 yes Figure 4 A magnified image of point A;

[0035] As shown in the figure: communication channel 1, lining 2, pump room well 3, orifice pipe 4, nozzle 5, bottom seal 6, pump room well pipe 7, lifting mechanism 8, horizontal rotation drive device 9, opening 21, pump room well lining part 22, first sealing ring 24, second sealing ring 25, first annular sealing brush 26, second annular sealing brush 27, first sealing grease cavity 28, second sealing grease cavity 29, ring beam 31, concrete retaining wall 32, pump room well pipe section 71. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0037] like Figures 1 to 6 As shown, the construction method of the pump room well in the communication channel of the present invention comprises:

[0038] Step 1: Figure 2 As shown, a communication channel 1 is constructed, and a lining 2 is arranged in the communication channel 1;

[0039] Step 2: Figure 3As shown, a downward opening 21 is provided on the lining 2 at the construction position of the pump room well 3 of the communication channel 1, and an orifice pipe 4 with a blowout prevention device is provided in the opening 21. The blowout prevention device can specifically adopt a gate-type blowout prevention device, which is not shown in the figure;

[0040] Step 3: Figure 3 As shown, a rotary spraying device is set up ( Figure 3 Not shown), such as MJS equipment, according to the design depth of the pump house well 3, the nozzle 5 of the rotary grouting equipment is inserted into the soil body through the orifice pipe 4 to the required depth, and the soil body is cut by the nozzle 5 to form a concrete block as the bottom cover 6 of the pump house well;

[0041] Step 4: withdraw the nozzle 5 and block the opening 21, wherein if the orifice tube 4 is not withdrawn, the opening 21 can be blocked by blocking the orifice tube 4;

[0042] Step 5: Figure 4 , Figure 5 As shown, a prefabricated pump room well tube 7 with an outer diameter smaller than the diameter of the bottom seal 6 is pushed downward at the construction position of the pump room well 3 of the communication channel 1, so that the lower end of the pump room well tube 7 penetrates the lining 2 and extends into the bottom seal 6, so as to cooperate with the bottom seal 6 in a sealed manner to form a pump room well water leakage prevention structure, wherein the part separated from the lining 2 when the lower end of the pump room well tube 7 penetrates the lining 2 is the pump room well lining part 22, and in the process of pushing the pump room well tube 7 downward, the pump room well lining part 22 is pressed to prevent the pump room well lining part 22 from moving due to water pressure to cause water and sand gushing accidents;

[0043] Step 6: Figure 6 As shown, waterproof treatment is performed between the upper end of the pump room well tube 7 and the lining 2, and the upper end of the pump room well tube 7 is connected to the lining 2, so that the pump room well tube 7 and the lining 2 are connected as a whole, thereby fixing the pump room well tube 7 to prevent it from moving upward; wherein, the waterproof treatment is mainly to prevent water or sand from seeping out from the connection between the pump room well tube 7 and the lining 2, and various existing conventional connection methods can be reasonably selected between the pump room well tube 7 and the lining 2 according to the materials of the pump room well tube 7 and the lining 2, such as welding, bolt connection, etc.;

[0044] Step 7: Remove the pump room well lining part 22 and the soil inside the pump room well pipe 7, and construct a concrete retaining wall 32 in the pump room well pipe 7 as a secondary lining.

[0045] Step one can adopt various existing construction methods such as dark excavation construction and mechanical construction. In order to improve construction efficiency, step one preferably adopts mechanical construction, such as shield construction and pipe jacking.

[0046] The pump room well tube 7 can be made of a concrete tube or a steel tube, and of course, other materials can also be used.

[0047] In the step seven, when the soil inside the pump room well pipe 7 is removed, slight water leakage may occur between the pump room well pipe 7 and the bottom cover 6. If slight water leakage occurs between the pump room well pipe 7 and the bottom cover 6, a grouting and sealing step is also included at the penetration point between the pump room well pipe 7 and the bottom cover 6.

[0048] The method for constructing a pump room well in a communication channel of the present invention first uses a rotary jet device to penetrate the inner lining 2 of the communication channel 1 to construct a bottom seal 6 of the pump room well, and then pushes a prefabricated pump room well pipe tube 7 with an outer diameter smaller than the diameter of the bottom seal 6 downward, so that the lower end of the pump room well pipe tube 7 penetrates the lining 2 and extends into the bottom seal 6 to seal with the bottom seal 6 to form a pump room well construction waterproof structure, and then fixes the pump room well pipe tube 7, and finally removes the pump room well lining part 22 and the soil inside the pump room well pipe tube 7. This method enables the lower end of the pump room well pipe tube 7 to be embedded in the bottom seal 6, and the bottom seal can be better fixed by relying on the pump room well pipe tube 7, so that the pump room well pipe tube 7 and the bottom seal 6 can be closely matched, and the sealing between the pump room well pipe tube 7 and the bottom seal 6 is good, which solves the problem of poor sealing between the pump room well pipe tube 7 and the bottom seal 6, and the pressure resistance and sealing of the pump room well pipe tube 7 and the bottom seal 6 are better than those of the grouting soil. Therefore, the pump room well water-leakage prevention structure formed by this method has good sealing and pressure resistance. This method reduces the risk of water and sand gushing accidents that may occur in the communication channel, especially when constructing the pump room well in the communication channel due to the deepening of the pump room well and the increase of water pressure, thereby improving the safety of the pump room well construction in the communication channel, and is particularly suitable for construction in complex construction environments with rich water sand layers. In addition, this method does not require continuous drainage and slurry discharge during the construction process, and does not require the drilling of precipitation wells, which reduces the construction cost and is not likely to cause instability of the surrounding soil.

[0049] The pump room well tube 7 can be an integral part, but because the communication channel has a small clearance, if the pump room well tube 7 is an integral part, the construction is inconvenient, and there may be a problem of insufficient length. Figure 7As shown, the pump room well pipe tube 7 in the present invention includes multiple pump room well pipe sections 71. When the pump room well pipe tube 7 is pushed downward at the construction position of the pump room well 3 of the communication channel 1, the pump room well pipe sections 71 are pushed downward in sequence, so that the pump room well pipe sections 71 are connected end to end in sequence and sealed to form the pump room well pipe tube 7. That is, when pushing, the first pump room well pipe section 71 is pushed first, and after it is pushed to a certain depth, the second pump room well pipe section 71 is connected to the first pump room well pipe section 71, so that the first pump room well pipe section 71 is further pushed to a certain depth through the second pump room well pipe section 71, and then the third pump room well pipe section 71 is connected to the second pump room well pipe section 71, and the second and third pump room well pipe sections 71 are further pushed to a certain depth through the third pump room well pipe section, so that the pump room well pipe sections 71 are pushed downward in sequence, so that the pump room well pipe sections 71 are connected end to end in sequence and sealed to form the pump room well pipe tube 7. The pump room well pipe sections 71 can be connected end to end in sequence by plugging and sealing. If the pump room well pipe sections 71 are made of steel tubes, the pump room well pipe sections 71 can also be welded.

[0050] Since the communication channel space is limited and the inner diameter clearance of the pump room well is relatively small, the diameter of the pump room well pipe 7 will also be relatively small. At the same time, in order to facilitate construction in the communication channel, in some embodiments, a lifting mechanism 8 such as a hydraulic cylinder, a jack, etc. is directly used to move up and down and propel the pump room well pipe 7, so that the pump room well pipe 7 impacts and cuts the lining 2, the soil and the bottom cover 6 to move forward. However, due to the high strength of the lining 2 and the bottom cover 6, it is not easy for the pump room well pipe 7 to enter the lining 2 and the bottom cover 6 directly by using the lifting mechanism 8 to move up and down and propel the pump room well pipe 7, resulting in low propulsion efficiency and possible damage to the lining 2 and the bottom cover 6, resulting in the lining 2 and the bottom cover 6 not being able to cooperate with the pump room well pipe 7 better, which may cause water, sand, etc. to pass through the gap between the lining 2 and the pump room well pipe 7 and between the bottom cover 6 and the pump room well pipe 7, resulting in water and sand gushing. In the embodiment of the present invention, the following steps are specifically adopted to push the pump room well tube 7 whose outer diameter is smaller than the diameter of the bottom cover 6 downward at the construction position of the pump room well 3 of the communication channel 1:

[0051] Step a, a lifting mechanism 8 is arranged above the construction position of the pump room well 3 of the communication channel 1, one end of the lifting mechanism 8 is installed on the lining 2, the lifting mechanism 8 can be a hydraulic cylinder, a jack, etc., and a horizontal rotation driving device 9 for driving the pump room well tube 7 to rotate horizontally is installed at the lower end of the lifting mechanism 8, such as a motor;

[0052] Step b, providing a sawtooth structure 72 at the lower end of the pump room well tube 7;

[0053] Step c, connecting the upper end of the pump room well pipe 7 to the driving shaft of the horizontal rotation drive device 9, using the horizontal rotation drive device 9 to drive the pump room well pipe 7 to rotate horizontally, using the lifting mechanism 8 to push the pump room well pipe 7 downward, so that the serrated structure 72 rotates and pushes downward, first cutting the lining 2, then cutting the soil, and finally cutting the bottom cover 6, so that the lower end of the pump room well pipe 7 penetrates the lining 2 and extends into the bottom cover 6.

[0054] In order to ensure strength, the sawtooth structure 72 can be made of alloy material and then installed on the pump room well tube 7.

[0055] The above-mentioned propulsion method can not only enable the lower end of the pump room well pipe 7 to smoothly pass through the lining 2 and enter the bottom cover 6, but also because the pump room well pipe 7 is propulsed by rotating downwardly by the sawtooth structure 72, the pump room well pipe 7 is not likely to damage the lining 2 and the bottom cover 6 during the propulsion process, and an annular groove compatible with the pump room well pipe 7 can be formed on the lining 2 and the bottom cover 6, thereby improving the sealing performance of the pump room well anti-leakage structure, and the propulsion equipment is simple and small in scale.

[0056] In the process of pushing the pump room well pipe tube 7 downward, a push rod or a counterweight 10 can be set in the communication channel 1 to press the pump room well lining part 22. When the pump room well pipe tube 7 is composed of multiple pump room well pipe sections 71, it is necessary to add and install the pump room well pipe section 71 during the pushing process. If a push rod is set to press the pump room well lining part 22, the push rod will affect the adding and installing of the pump room well pipe section 71. In order to facilitate the adding and installing of the pump room well pipe section 71 during the pushing process, it is best to press the pump room well lining part 22 by adding a counterweight.

[0057] During the process of the pump room well pipe 7 being pushed downward, a small amount of water or sand may seep out through the gap between the pump room well pipe 7 and the lining 2. For this reason, further, between step four and step five, the construction method further includes the step of: providing a sealing structure at the construction position of the pump room well 3 of the communication channel 1 for cooperating with the pump room well pipe 7 to prevent water from passing through between the pump room well pipe 7 and the lining 2.

[0058] The sealing structure can be any existing sealing structure, such as a rubber seal provided on the lining 2 to seal with the inner and outer walls of the pump room well tube 7. Figure 8As shown, in the embodiment of the present invention, the sealing structure includes a first sealing ring 24 and a second sealing ring 25 which are concentrically arranged in the lining 2. The first sealing ring 24 and the second sealing ring 25 can be steel rings. The lower ends of the first sealing ring 24 and the second sealing ring 25 are respectively sealed and connected to the lining 2. The first sealing ring 24 is located outside the second sealing ring 25. The inner wall of the first sealing ring 24 is provided with a plurality of first annular sealing brushes 26 which are vertically spaced and one end of which is abutted against the outer wall of the pump room well tube 7. A first sealing grease cavity 28 is formed between adjacent first annular sealing brushes 26. The second sealing ring 2 The outer wall of the pump room well tube 7 is provided with a plurality of second annular sealing brushes 27 arranged at vertical intervals, and one end of the second annular sealing brushes 27 abut against the inner side of the pump room well tube 7, and a second sealing grease cavity 29 is formed between adjacent second annular sealing brushes 27; when the pump room well tube 7 is pushed downward, grease is filled into the first sealing grease cavity 28 and the second sealing grease cavity 29, and the grease will be filled in the sealing grease cavity and the bristle gap of the annular sealing brush to achieve sealing cooperation with the pump room well tube 7, which can prevent water or sand from passing through between the first sealing ring 24 and the second sealing ring 25, and further prevent water or sand from passing through the gap between the pump room well tube 7 and the lining 2 and seeping out. Compared with other methods, the above method has a better leak-proof sealing effect on water and sand, and is more convenient for the pump room well tube to be pushed downward.

[0059] Specifically, the first sealing ring 24 and the second sealing ring 25 can be fixed to the lining 2 by bolt connection respectively, and then a waterproof material is arranged between the sealing rings and the lining 2 to achieve a sealed connection with the lining 2.

Claims

1. A method for constructing a pump house well in a communication channel, characterized in that: The construction method comprises: Step 1: construct a communication channel (1) and set a lining (2) in the communication channel (1); Step 2: a downward opening (21) is provided on the lining (2) at the construction position of the pump room well (3) of the communication channel (1), and an orifice pipe (4) with a blowout prevention device is provided in the opening (21); Step 3: Setting up a jet grouting device, inserting a nozzle (5) of the jet grouting device through the orifice pipe (4) downward into the soil to a required depth, and using the nozzle (5) to cut the soil to form a concrete block to serve as a bottom seal (6) of the pump room well; Step 4: withdrawing the nozzle (5) and sealing the opening (21); Step 5: Pushing a prefabricated pump room well tube (7) whose outer diameter is smaller than the diameter of the bottom seal (6) downward at the construction position of the pump room well (3) of the communication channel (1), so that the lower end of the pump room well tube (7) penetrates the lining (2) and extends into the bottom seal (6) to form a pump room well water leakage prevention structure, wherein the part separated from the lining (2) when the lower end of the pump room well tube (7) penetrates the lining (2) is the pump room well lining part (22), and in the process of pushing the pump room well tube (7) downward, the pump room well lining part (22) is pressed; Step 6: Perform waterproofing between the upper end of the pump room well tube (7) and the lining (2), and connect the upper end of the pump room well tube (7) to the lining (2), so that the pump room well tube (7) and the lining (2) are connected as a whole; Step 7: remove the pump house well lining part (22) and the soil inside the pump house well pipe (7), and construct a concrete retaining wall (32) inside the pump house well pipe (7) as a secondary lining.

2. The method for constructing a pump house well in a communication channel as claimed in claim 1, characterized in that: The pump room well pipe tube (7) comprises a plurality of pump room well pipe sections (71). When the pump room well pipe tube (7) is pushed downward at the construction position of the pump room well (3) of the communication channel (1), the pump room well pipe sections (71) are pushed downward in sequence, so that the pump room well pipe sections (71) are connected end to end in sequence and sealed to form the pump room well pipe tube (7).

3. The method for constructing a pump house well in a communication channel as claimed in claim 1, characterized in that: A pump room well pipe (7) having an outer diameter smaller than the diameter of the bottom cover (6) is pushed downwardly at the construction position of the pump room well (3) of the communication channel (1), comprising: A lifting mechanism (8) is arranged above the construction position of the pump room well (3) of the communication channel (1), and a horizontal rotation drive device (9) is installed at the lower end of the lifting mechanism (8); A sawtooth structure (72) is provided at the lower end of the pump room well tube (7); The upper end of the pump room well tube (7) is connected to the drive shaft of the horizontal rotation drive device (9), the horizontal rotation drive device (9) is used to drive the pump room well tube (7) to rotate horizontally, and the lifting mechanism (8) is used to push the pump room well tube (7) downward, so that the sawtooth structure (72) rotates and pushes downward, first cutting the lining (2), then cutting the soil, and finally cutting the bottom cover (6), so that the lower end of the pump room well tube (7) penetrates the lining (2) and extends into the bottom cover (6).

4. The method for constructing a pump house well in a communication channel as claimed in claim 1 or 3, characterized in that: Between step 4 and step 5, the construction method further comprises the steps of: A sealing structure is provided at the construction position of the pump room well (3) of the communication channel (1) for cooperating with the pump room well pipe tube (7) to prevent water from passing between the pump room well pipe tube (7) and the lining (2).

5. The method for constructing a pump house well in a communication channel as claimed in claim 4, characterized in that: The sealing structure comprises a first sealing ring (24) and a second sealing ring (25) which are concentrically arranged in the lining (2); the lower ends of the first sealing ring (24) and the second sealing ring (25) are respectively sealed and connected to the lining (2); the first sealing ring (24) is located outside the second sealing ring (25); the inner wall of the first sealing ring (24) is provided with a plurality of first annular sealing brushes (26) which are arranged vertically at intervals and one end of which abuts against the outer wall of the pump room well tube (7); a first sealing grease cavity (28) is formed between adjacent first annular sealing brushes (26); the outer wall of the second sealing ring (25) is provided with a plurality of second annular sealing brushes (27) which are arranged vertically at intervals and one end of which abuts against the inner wall of the pump room well tube (7); a second sealing grease cavity (29) is formed between adjacent second annular sealing brushes (27); When the pump room well tube (7) is pushed downward, grease is filled into the first sealing grease chamber (28) and the second sealing grease chamber (29), and the grease is used to achieve sealing cooperation with the pump room well tube (7).

6. The method for constructing a pump house well in a communication channel as claimed in claim 1, 2 or 3, characterized in that: In the process of pushing the pump room well pipe (7) downward, in the step of pressing the lining portion (22) located in the pump room well, a counterweight is added to press the lining portion (22) located in the pump room well.

7. The method for constructing a pump house well in a communication channel as claimed in claim 1, characterized in that: The step 1 adopts a mechanical method.

8. The method for constructing a pump house well in a communication channel as claimed in claim 1, characterized in that: The pump room well tube (7) is a steel tube or a concrete tube.

9. The method for constructing a pump house well in a communication channel as claimed in claim 1, characterized in that: The concrete retaining wall (32) is constructed using the caisson method.

10. The method for constructing a pump house well in a communication channel as claimed in claim 1, characterized in that: In the step seven, when removing the soil inside the pump room well tube (7), if water leakage occurs between the pump room well tube (7) and the bottom seal (6), the step also includes grouting and sealing the penetration point between the pump room well tube (7) and the bottom seal (6).

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