River-crossing water supply pipe sinking construction method

Abstract

The invention discloses a river-crossing water supply pipe sinking construction method. The method comprises the following steps that (1) a river bottom groove is excavated; (2) ashore splicing: splicing a plurality of sections of pipelines to form a plurality of spliced pipelines; (3) humping and launching: humping and floating the plurality of spliced pipelines on the water in sequence; a plurality of splicing pipes floating on the water are sequentially in butt joint to obtain a straight pipe section, a water welding work cabin is installed at the butt joint position of the two splicing pipes, at least two points on each splicing pipe are connected with corresponding anchoring points on the shore, elbow pipe fittings are in butt joint with the two ends of the straight pipe section, the elbow pipe fittings are parallel to the water surface, and a water supply pipe section is formed through welding; (5) swinging and rotating the pipe section and sinking, namely swinging the water supply pipe section on the water surface to stretch across the river surface, overturning the elbow pipe fitting to 25-35 degrees, injecting water into the water supply pipe section, and adjusting the elbow pipe fitting again to be vertical to the water surface; continuously injecting water into the water supply pipe section until the water supply pipe section is full, and settling the water supply pipe section to a riverbed; (6) data processing; and (7) constructing a monitoring platform.

Description

Technical Field

[0001] The invention relates to water supply pipeline construction, in particular to a river-spanning water supply pipe immersed pipe construction method. Background Art

[0002] During the construction of water supply pipelines, some pipelines need to cross rivers and waterways; however, the water surface width of rivers is large.

[0003] The inventor discovered during the water supply construction process that the route of the water supply pipeline usually needs to span a width of more than 50 meters across the river surface, and there is currently no lifting equipment for lifting operations across the river surface. The pipeline needs to be spliced ​​at the construction site, but the pipeline splicing site on the shore is limited, and it is difficult to provide the land area required for splicing long pipelines. The allowable span value of the pipeline is related to the outer diameter of the pipeline, the wall thickness of the pipeline, the elastic modulus, the moment of inertia of the pipeline, the deflection value and the load per unit length of the pipeline. Therefore, when the length of the pipeline exceeds its allowable span value, the pipeline is prone to deformation. Therefore, even if the shore can splice a cross-river pipeline of the required length across the river, the length of the cross-river pipeline is far beyond the allowable span value of the pipeline, and the first pipeline deformation has already occurred; when it is dragged into the water from the shore, the height difference between the shore and the river surface and the buoyancy of the water cause the entire cross-river pipeline to deform again.

[0004] After searching, it was found that there is a Chinese patent application (CN111706712A) on the span construction of water supply pipes, which discloses a large-span water supply pipe support system and its construction method, and the span disclosed in the background technology of its specification is 12m to 32m. Through the technical means disclosed in the specification, it can be known that its main purpose is to support the water supply pipe suspended in the air through a large-span water supply pipe support system. The construction site involved is located on land.

[0005] In addition, the existing water supply pipe positioning technology has limitations in plane positioning and vertical height monitoring during the construction of the existing water supply pipe. In particular, considering the impact of tidal water level rise and fall on the pipeline sinking depth, a cross-river water supply pipe sinking construction method applicable to crossing rivers needs to be developed to address the defects of the existing technology. Summary of the invention

[0006] The purpose of the present invention is to provide a method for constructing a water supply pipe across a river based on the defects of the prior art. The present invention provides a three-dimensional precise positioning system for pipeline immersed pipe construction based on RTK technology to improve construction accuracy and efficiency, ensure that the pipeline can be accurately placed at the predetermined position, and monitor the distance between the pipeline and the bottom of the tank in real time.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical scheme is adopted:

[0008] A method for constructing a river-crossing water supply pipe immersed tube, the method comprising the following steps:

[0009] (1) Riverbed trench: According to the route of the water supply pipe across the river, a riverbed trench is pre-dug at the riverbed;

[0010] (2) Onshore splicing: Multiple sections of pipelines are spliced ​​together on shore to obtain multiple spliced ​​pipelines;

[0011] (3) lowering into the water: lowering the plurality of spliced ​​pipes into the water in sequence and floating them on the water;

[0012] (4) On-water splicing: float the spliced ​​pipes floating on the water to the splicing position, then install an on-water welding cabin at the joint of the two spliced ​​pipes, and at least two points on each spliced ​​pipe are connected to the corresponding anchor points on the shore, and the spliced ​​pipes and the on-water welding cabin are fixed together with a crane ship. Finally, the spliced ​​pipes are welded in the on-water welding cabin to obtain a straight pipe section; the elbow pipe fittings are spliced ​​and welded at both ends of the straight pipe section using the same method, and the elbow pipe fittings are parallel to the water surface. After welding, the water supply pipe section is obtained;

[0013] (5) Pipe section swinging and sinking: Separate the above-water welding work cabin, swing the water supply pipe section on the water surface to the river surface across the immersed pipe position, and then flip the elbow pipe fitting to 25-35 degrees. Then, while injecting water into the water supply pipe section, adjust the elbow pipe fitting again to be vertical to the water surface; continue to inject water into the water supply pipe section until it is full of water. The water supply pipe section sinks to the riverbed, and the RTK technology is used to perform plane positioning monitoring on the straight pipe section, and the vertical height monitoring technology is used to perform multi-point monitoring along the vertical height of the pipeline and the riverbed trench;

[0014] (6) Data processing: The plane positioning monitoring and vertical height monitoring data information obtained in step (4) are transmitted to the central monitoring system in real time via a wireless data link, and are comprehensively processed in the central monitoring system;

[0015] (7) Construct a monitoring platform that receives data information transmitted from the central monitoring system and displays it accordingly, and adjusts the pipeline as needed.

[0016] As a further improvement of the technical solution, the RTK technology in step (5) includes a base station and a mobile station, the base station is installed on the river bank of the construction site or on the surface of the river, and the mobile station is installed on the straight pipe section obtained in step (4), and the base station is communicatively connected to the mobile station, and the mobile station is communicatively connected to the monitoring platform; wherein the mobile station is used to monitor the planar positioning of the pipeline.

[0017] As a further improvement of the technical solution, the vertical height monitoring technology includes an ultrasonic rangefinder, and at least one ultrasonic rangefinder is installed on the straight pipe section obtained in step (4), and the ultrasonic rangefinder is communicatively connected to the monitoring platform; wherein the ultrasonic rangefinder is used to monitor the vertical distance between the pipeline and the riverbed trench.

[0018] As a further improvement of the technical solution, the method for installing the above-water welding work cabin in step (2) is as follows:

[0019] ② Use a crane to hook the above-water welding work cabin and sink it to the bottom of the joint of the two spliced ​​pipes;

[0020] ② Slowly lifting the water welding work cabin, the water welding work cabin rises to the splicing pipes sleeved on both sides of the butt joint;

[0021] ③ Using a small boat to approach the water welding work cabin, the construction workers will detachably fix the water welding work cabin on the spliced ​​pipe, and the water welding work cabin and the spliced ​​pipe will be tightly connected. Then, a submersible pump will be placed in the water welding work cabin to drain the water in the water welding work cabin.

[0022] As a further improvement of the technical solution, in step (3), the spliced ​​pipe is hoisted by a crane ship and floats on the water surface.

[0023] As a further improvement of the technical solution, in step (5), water is injected into the water supply pipe section to assist sinking. When the water injection volume reaches 65% to 70% of the total volume of the water supply pipe section, the pipe section is just in a suspended state. Then, water injection is continued and at the same time, each hanging point is gradually tightened to control the sinking speed of the water supply pipe section and the shape of the water supply pipe section during the sinking process.

[0024] As a further improvement of the technical solution, in the step (5), when injecting water into the water supply pipe section, the height of one elbow pipe fitting is first adjusted to be lower than the other elbow pipe fitting, and the injected water is concentrated on the lower elbow pipe fitting.

[0025] As a further improvement of the technical solution, in the step (3), when the spliced ​​pipe is lowered into the water, a rolling element is installed at the bottom of the spliced ​​pipe.

[0026] As a further improvement of the technical solution, in step (5), before the pipeline is swung, a swing anchor point is set on the shore, the swing anchor point is connected to the water supply pipeline, and then the connection between the spliced ​​pipeline and the anchor point on the shore is released.

[0027] An above-water welding work cabin used in the above-mentioned immersed tube construction method for cross-river water supply pipes, comprising a cabin body, the top of which is open and has two corresponding U-shaped notches on the cabin body; a sealing member, the inner edge of the U-shaped notch is equipped with the sealing member; and at least two tension adjusting members, the cabin body is equipped with the at least two tension adjusting members; and an inlet valve; a water inlet is provided at the bottom of the cabin body, the water inlet is equipped with a water inlet valve, and the water inlet valve is located in the cabin body; wherein, the above-water welding work cabin also includes a water collection well; at least one water collection well is provided at the bottom of the cabin body; the water collection well is connected to the cabin body through a water collection hole provided at the bottom of the cabin body.

[0028] Working principle:

[0029] The water welding work cabin is filled with water and sunk below the water surface, and then the water welding work cabin is transported by a crane ship to the bottom of the joint of the spliced ​​pipes, and then the water welding work cabin is installed on the spliced ​​pipes on both sides of the joint. The water welding work cabin is airtightly connected to the spliced ​​pipes, and then the water in the water welding work cabin is pumped out, and the welding construction personnel can carry out welding construction operations in the water welding work cabin.

[0030] The present invention has significant improvements over the prior art:

[0031] 1. The present invention is based on the RTK technology of the pipeline immersed pipe construction three-dimensional precise positioning system, in order to improve the construction accuracy and efficiency, to ensure that the pipeline can be accurately placed at the predetermined position, and to monitor the distance of the pipeline from the bottom of the tank in real time. It can also overcome the problem of limited construction site on the shore and the problem that the pipeline directly spliced ​​on the shore to cross the river will suffer multiple deformations during the construction process.

[0032] 2. The present invention adopts segmented splicing on the shore to obtain multiple sections of spliced ​​pipes, and the spliced ​​pipes are then assembled on the river surface to form the required pipes across the river; that is, multiple sections of pipes are first spliced ​​to the required length according to the design requirements on the shore to obtain the spliced ​​pipes, and then the spliced ​​pipes are lowered into the water, and the spliced ​​pipes are hoisted on the water surface by a crane ship, and in the direction of the water flow, and multiple spliced ​​pipes are sequentially butted, and then the spliced ​​pipes are correspondingly connected to the anchor points provided on the shore, and an on-water welding work cabin for welding construction operations is installed at the butt joint, so that The butt joints between the spliced ​​pipes are welded; the spliced ​​water supply pipe sections are then swung across the water surface by crane vessels and tugboats to the desired position, and then water is injected into the water supply pipe sections to assist sinking. During this process, RTK technology is used to perform planar positioning monitoring of the straight pipe section, and vertical height monitoring technology is used to perform multi-point monitoring of the vertical height of the pipeline and the riverbed trench along the length of the pipeline. The monitoring platform can receive data information transmitted by the central monitoring system for corresponding display, and adjust the pipeline as needed.

[0033] 3. The present invention adopts RTK technology and vertical height monitoring technology to reduce construction errors, improve project quality, reduce construction costs, and improve construction efficiency.

[0034] 4. The present invention adopts RTK technology and vertical height monitoring technology and is not affected by the rise and fall of tidal water levels, ensuring accurate control of the distance between the pipeline and the bottom of the tank.

[0035] 5. The present invention adopts an above-water welding work cabin which is sleeved on the joint of the spliced ​​pipes. The above-water welding work cabin can be sealed and connected with the spliced ​​pipes on both sides of the joint. When the above-water welding work cabin is tightly sleeved on the spliced ​​pipes, a submersible pump is used to extract water therein, and the joint between the two spliced ​​pipes is exposed in the above-water welding work cabin, and the welding construction personnel can weld the joint.

[0036] 6. The water welding work cabin of the present invention is also provided with a water collection well, which is used to collect water leaking from the connection between the water welding work cabin and the spliced ​​pipeline, thereby avoiding water accumulation in the water welding work cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0038] Figure 1 A schematic diagram of a structure of splicing multiple pipe sections in the present invention;

[0039] Figure 2 A schematic diagram of a structure for releasing water through a spliced ​​pipeline in the present invention;

[0040] Figure 3 It is a structural schematic diagram of installing an above-water welding work cabin at the joint of the spliced ​​pipes on the water surface in the present invention;

[0041] Figure 4 It is a structural schematic diagram of the above-water welding work cabin installed on the spliced ​​pipeline in the invention;

[0042] Figure 5 It is a schematic diagram of the structure of the spliced ​​pipeline in the present invention when it floats on the water surface and is connected to the anchor point on the shore;

[0043] Figure 6 It is a schematic diagram of the structure in which the water supply pipe section of the present invention is swung to cross the river surface;

[0044] Figure 7 It is a structural schematic diagram of the elbow pipe fittings at both ends of the flipped water supply pipe section in the present invention;

[0045] Figure 8 It is a schematic diagram of the structure of injecting water into the elbow pipe fitting at a lower position on the water supply pipe in the present invention;

[0046] Fig. 9 It is a structural schematic diagram of water injection to assist sinking of a water supply pipe section in the present invention. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present application.

[0048] Embodiment 1:

[0049] like Figures 1 to 9 As shown, the present invention provides a method for constructing a river-crossing water supply pipe immersed tube, the method comprising the following steps:

[0050] (1) Riverbed trench: According to the route of the water supply pipe across the river, a riverbed trench is pre-dug at the riverbed;

[0051] (2) Onshore splicing: Onshore, multiple sections of pipelines are spliced ​​and hoisted onto multiple pre-laid sleepers using lifting equipment such as gantry cranes, cranes, double-beam cranes or traveling cranes. Multiple sleepers are arranged at intervals; the interval can be 2m, and the combined laying length of multiple sleepers can be 255 meters to 280 meters; the selected pipeline is φ1626*20 spiral steel pipe, each section is 12m, and when splicing, it can be combined into 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 or 25 sections, so that there are multiple spliced ​​pipelines, and the length of the spliced ​​pipeline that can be spliced ​​is 255 meters.

[0052] (3) Sliding into the water: Multiple spliced ​​pipes are slid into the water in sequence and float on the water. They are then transported to the set position by a crane ship. That is, a 300t self-unloading tugboat is used to tow the spliced ​​pipes along the slideway and move them into the water. The total length of the slideway is the same as that of the longest spliced ​​pipe, and the overall inclination of the slideway is 6‰.

[0053] (4) Splicing on water: The spliced ​​pipe is pulled by a crane ship and floats on the water surface. Then, the multiple spliced ​​pipes floating on the water are floated to the splicing position. Then, an on-water welding cabin is installed at the joint of the two spliced ​​pipes. At the same time, at least two points on each spliced ​​pipe are connected to the corresponding anchor points on the shore. The spliced ​​pipes and the on-water welding cabin are fixed together with the crane ship. Finally, the spliced ​​pipes are welded in the on-water welding cabin to obtain a straight pipe section. The same method is used to complete the splicing and welding of the elbow pipe fittings at both ends of the straight pipe section. The elbow pipe fittings are parallel to the water surface. After welding, the water supply pipe section is obtained. The on-water welding cabin provides a welding construction work platform for welding construction personnel.

[0054] The spliced ​​pipes are connected to anchor points on the shore, which can help fix the spliced ​​pipes and prevent them from drifting.

[0055] (5) Pipe section swinging and sinking: Separate the above-water welding work cabin, swing the water supply pipe section on the water surface to the river surface across the sinking position, then turn the elbow fittings to 25-35 degrees, and then, while injecting water into the water supply pipe section, adjust the elbow fittings again to be vertical to the water surface; continue to inject water into the water supply pipe section until it is full of water, and sink the water supply pipe section to the riverbed. RTK technology is used to monitor the plane positioning of the straight pipe section, and vertical height monitoring technology is used to monitor the vertical height of the pipeline and the riverbed trench at multiple points along the length of the pipeline. Before the pipeline is swung, a swing anchor point is set on the shore, the swing anchor point is connected to one end of the water supply pipeline, and then the connection between the spliced ​​pipeline and the anchor point on the shore is released, and the other end of the water supply pipeline is connected by a tugboat, and the crane ship on the straight pipe section continues to pull. The crane ship and tugboat work simultaneously, pulling the water supply pipe to gradually move along the direction of the river flow until the water supply pipe crosses to the preset position. At this time, the water supply pipe crosses the river surface. The tugboat can be a 75KW power ship, using 12 80t crane ships.

[0056] (6) Data processing: The plane positioning monitoring and vertical height monitoring data information obtained in step (5) are transmitted to the central monitoring system in real time via a wireless data link, and are comprehensively processed in the central monitoring system;

[0057] (7) Construct a monitoring platform that receives data information transmitted from the central monitoring system and displays it accordingly, and adjusts the pipeline as needed.

[0058] When injecting water into the water supply pipe section, first adjust the height of one elbow pipe fitting to be lower than the other elbow pipe fitting, and the injected water will be concentrated on the elbow pipe fitting at the lower position, which can facilitate the water supply pipe section to be turned over.

[0059] The water supply pipe section is injected with water to assist sinking. When the water injection volume reaches 65% to 70% of the total volume of the water supply pipe section, the pipe section is just in a suspended state. Then continue to inject water, and at the same time, each suspension point is gradually tightened to control the sinking speed of the water supply pipe section and the shape of the water supply pipe section during the sinking process. The water injection volume reaches 65%, 66%, 67%, 68%, 69% or 70% of the total volume of the water supply pipe section.

[0060] The first turning angle of the elbow fitting can be 25°, 30° or 35°, etc. After water injection, the water supply pipe is turned over by a crane on the shore and a crane on the water surface until the elbow fitting is vertical on the water surface. The crane specification can be an 80t crane.

[0061] The water pressure test is carried out when the pipeline is completely filled with water. This is the most unfavorable working condition. The load on a single lifting point is calculated to be 33t. The crane and the crane ship have more than double the lifting capacity, and the safety factor is above 2.

[0062] After the water supply pipeline crosses the river, both ends of the pipeline are lifted by a crane.

[0063] It should be noted that RTK technology is a real-time dynamic carrier phase differential technology, which aims to achieve high-precision positioning through data transmission between the base station and the mobile station. The base station receives satellite signals and transmits the collected carrier phase observations and station coordinate information to the mobile station in real time through the data radio, ensuring that the mobile station can process the received data in real time and give centimeter-level positioning results. The base station should be set up in a place with a wide field of view, an open environment, and high terrain to avoid electromagnetic interference and obstacles, and ensure excellent signal reception and transmission. In addition, the selection of the base station should also consider avoiding radio interference in areas such as radio stations, high-voltage lines, transformers, and under the shade of trees and large areas of water to reduce signal interference and measurement errors.

[0064] It can be understood that the RTK technology in step (5) of the present invention includes a base station and a mobile station. The base station is installed on the river bank of the construction site or on the surface of the river, and the mobile station is installed on the straight pipe section obtained in step (4). The base station is communicatively connected to the mobile station, and the mobile station is communicatively connected to the monitoring platform; wherein the mobile station is used to monitor the planar positioning of the pipeline.

[0065] When the base station is installed on the river surface, a mounting platform is laid on the river surface to support the base station. Of course, the number of base stations installed is not limited to one. The appropriate number of base stations can be selected according to the length of the immersed tube construction route. When multiple base stations are installed, the data transmission range of each base station can cover all mobile stations within its range.

[0066] The number of mobile stations installed on each straight pipe section can be 3, 4, 5, 6, 7 or 8. During installation, a mobile station is installed at each end of the pipeline, which can be located at the bend. 1, 2, 3, 4, 5 or 6 mobile stations can be installed on the straight pipe section of the pipeline. The data information obtained by the mobile station monitoring is transmitted to the monitoring platform in real time, so that the construction personnel can timely obtain the plane positioning data information of the pipeline. When the position of the pipeline exceeds the set plane positioning data, it is convenient for the construction personnel to take timely countermeasures and adjust the pipeline to reset to the set plane positioning data.

[0067] The vertical height monitoring technology performs multi-point monitoring of the vertical height between the pipeline and the riverbed trench along the length direction of the pipeline. The vertical height monitoring technology includes an ultrasonic distance meter. At least one ultrasonic distance meter is installed on the straight pipe section obtained in step (4), and the ultrasonic distance meter is communicatively connected to the monitoring platform; wherein the ultrasonic distance meter is used to monitor the vertical distance between the pipeline and the riverbed trench.

[0068] It is understandable that the ultrasonic rangefinder can be used to determine the position interval between the sinking pipe and the riverbed groove, and the data information transmitted to the monitoring platform by the ultrasonic rangefinder can be used to determine whether the sinking pipe and the riverbed groove are aligned. If there is a deviation, adjustment can be made to restore the alignment of the sinking pipe with the riverbed groove.

[0069] The present invention overcomes the technical problems that the water supply pipe is too long to be welded across the river surface and the pipe suffers from multiple deformations. The pipes of required length are pre-spliced ​​on the shore according to the width across the river surface, and then the multiple spliced ​​pipes are dragged and dropped into the water. The river surface is used as a construction site for splicing pipes of required length across the river surface, and the technical problem that overlong pipes cannot be spliced ​​on the shore site is solved. The spliced ​​water supply pipe section is driven by a crane ship and a tugboat to cross the river surface, so that the overlong pipes can be spliced ​​and the overlong pipes can be spanned to the set required position at the same time.

[0070] Embodiment 2:

[0071] Compared with Example 1, the difference lies in: providing an installation method for an above-water welding work cabin.

[0072] like Figure 3 As shown, the installation method of the water welding work cabin includes:

[0073] (1) Use a crane boat to hook the above-water welding work cabin and sink it to the place just below the joint of the two joint pipes;

[0074] (2) Slowly lift the water welding work cabin, and the water welding work cabin rises to the joint pipes on both sides of the butt joint;

[0075] (3) Use a small boat to approach the water welding work cabin. The construction workers will detachably fix the water welding work cabin on the splicing pipe. The water welding work cabin and the splicing pipe are tightly connected. Then put the submersible pump into the water welding work cabin to drain the water in the water welding work cabin. The joint between the splicing pipe and the water welding work cabin is tightly connected, which can prevent water from leaking into the water welding work cabin. It can provide a good construction environment for welding.

[0076] It is understandable that an above-water welding work cabin can be installed at each docking point.

[0077] Embodiment 3:

[0078] Compared with embodiment 1 or 2, the difference lies in that a structure of an above-water welding work cabin is provided.

[0079] The above-water welding work cabin comprises a cabin body, a sealing member and at least two tension adjusting members. The cabin body is open at the top and has two corresponding U-shaped notches. The inner edges of the U-shaped notches are provided with sealing members. At least two tension adjusting members are provided on the cabin body.

[0080] One end of the U-shaped groove is open, and the other end is a semicircular structure.

[0081] Connection method between the water welding work cabin and the splicing pipeline:

[0082] Sleeve connection work: The U-shaped notch on the cabin moves upward from the bottom of the joint between the two spliced ​​pipes, and is sleeved on the spliced ​​pipes on both sides of the joint. The cabin is connected to the spliced ​​pipes through at least two elastic adjustment parts, one end of the elastic adjustment part is connected to the cabin, and the other end is connected to the spliced ​​pipes. Then the cabin is tightly sleeved on the spliced ​​pipes by adjusting and pulling the elastic adjustment parts, and the U-shaped notch is installed with a seal, so that the U-shaped notch and the spliced ​​pipes are sealed to prevent water from leaking into the cabin. After installation, use a submersible pump or other pumping equipment to pump out the water in the cabin.

[0083] The top of the cabin is open, and during welding operations, welding workers can enter the cabin from the top of the cabin.

[0084] Disengagement work: After the welding of the joint between the two spliced ​​pipes is completed, the welding construction workers detach from the cabin, and while injecting water into the cabin, release the connection between the tension adjuster and the cabin, and use the crane ship to lift the cabin. When the amount of water injected is greater than the water outside the cabin, which gives the cabin buoyancy, the cabin sinks, the cabin is separated from the spliced ​​pipes, and is lifted and recovered by the crane ship.

[0085] It is understandable that the tension adjusting member can be a hand chain hoist, and the specification of the hand chain hoist can be a 1t hand chain hoist.

[0086] Connection method of tension adjustment piece and splicing pipe:

[0087] There are two cross beams on the top of the spliced ​​pipes at the joint, and the two cross beams are symmetrically arranged at the joint. A hand winch is installed at each end of the cross beam, and then the hook of the hand winch is connected to the cabin body. Then, the hand winch is used to adjust the tightness of the connection between the cabin body and the spliced ​​pipes.

[0088] Furthermore, at least one water collecting well is provided at the bottom of the cabin; the water collecting well is connected with the cabin through a water collecting hole opened at the bottom of the cabin.

[0089] The number of water collecting wells that can be installed is 1, 2, 3 or 4, etc. The water collecting well is used to collect water in the cabin, that is, when there is a leak at the connection between the cabin and the spliced ​​pipe, the water entering the cabin can be discharged into the water collecting well.

[0090] It is understandable that when an above-water welding work cabin is installed on the spliced ​​pipeline, when a submersible pump is used to extract water from the cabin, the water in the water collection well can also be extracted by the submersible pump.

[0091] In order to facilitate the separation of the above-water welding work cabin from the splicing pipeline, a water inlet is opened at the bottom of the cabin body, and a water inlet valve is installed at the water inlet, and the water inlet valve is located in the cabin body.

[0092] Working method:

[0093] After welding is completed, the connection between the above-water welding work cabin and the splicing pipeline is removed. At this time, the cabin is hollow, and the water provides buoyancy to the cabin, making it difficult for the cabin to separate from the splicing pipeline. At this time, the water inlet valve is opened, and water is squeezed into the cabin to achieve water injection into the cabin. As the amount of water injected increases, the cabin sinks and separates from the splicing pipeline.

[0094] Embodiment 4:

[0095] Compared with any one of the embodiments 1-3, the difference is that: a rolling element used for the spliced ​​pipe to be lowered into the water is provided.

[0096] In step (3), when the spliced ​​pipe is lowered into the water, a rolling member is installed at the bottom of the spliced ​​pipe to assist the spliced ​​pipe to slide into the water surface.

[0097] The rolling element may be a roller or a pulley block, etc. A plurality of rollers are placed transversely relative to the spliced ​​pipes, and the spliced ​​pipes slide into the water surface with the help of the rollers.

[0098] The pulley block may have the following structure: two pulleys are arranged in parallel at intervals and then connected by an axis; multiple pulley blocks are arranged in parallel at intervals; the spliced ​​pipes are placed on top of the multiple pulley blocks; and the spliced ​​pipes slide through the pulley blocks.

[0099] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the protection scope of the invention.

Claims

1. A method for constructing a water supply pipe across a river, characterized in that: The method comprises the following steps: (1) Riverbed trench: According to the route of the water supply pipe across the river, a riverbed trench is pre-dug at the riverbed; (2) Onshore splicing: Multiple sections of pipelines are spliced ​​together on shore to obtain multiple spliced ​​pipelines; (3) lowering into the water: lowering the plurality of spliced ​​pipes into the water in sequence and floating them on the water; (4) On-water splicing: float the spliced ​​pipes floating on the water to the splicing position, then install an on-water welding cabin at the joint of the two spliced ​​pipes, and at least two points on each spliced ​​pipe are connected to the corresponding anchor points on the shore, and the spliced ​​pipes and the on-water welding cabin are fixed together with a crane ship. Finally, the spliced ​​pipes are welded in the on-water welding cabin to obtain a straight pipe section; the elbow pipe fittings are spliced ​​and welded at both ends of the straight pipe section using the same method, and the elbow pipe fittings are parallel to the water surface. After welding, the water supply pipe section is obtained; (5) Pipe section swinging and sinking: Separate the above-water welding work cabin, swing the water supply pipe section on the water surface to the river surface across the immersed pipe position, and then flip the elbow pipe fitting to 25-35 degrees. Then, while injecting water into the water supply pipe section, adjust the elbow pipe fitting again to be vertical to the water surface; continue to inject water into the water supply pipe section until it is full of water. The water supply pipe section sinks to the riverbed, and the RTK technology is used to perform plane positioning monitoring on the straight pipe section, and the vertical height monitoring technology is used to perform multi-point monitoring along the vertical height of the pipeline and the riverbed trench; (6) Data processing: The plane positioning monitoring and vertical height monitoring data information obtained in step (4) are transmitted to the central monitoring system in real time via a wireless data link, and are comprehensively processed in the central monitoring system; (7) Construct a monitoring platform that receives data information transmitted from the central monitoring system and displays it accordingly, and adjusts the pipeline as needed.

2. The method for constructing a river-spanning water supply pipe immersion pipe according to claim 1, characterized in that: The RTK technology in step (5) includes a base station and a mobile station, wherein the base station is installed on the river bank of the construction site or on the river surface, and the mobile station is installed on the straight pipe section obtained in step (4), and the base station is communicatively connected to the mobile station, and the mobile station is communicatively connected to the monitoring platform; Wherein, the mobile station is used to monitor the planar positioning of the pipeline.

3. The method for constructing a river-spanning water supply pipe immersion pipe according to claim 1, characterized in that: The vertical height monitoring technology includes an ultrasonic rangefinder, and at least one ultrasonic rangefinder is installed on the straight pipe section obtained in step (4), and the ultrasonic rangefinder is communicatively connected to the monitoring platform; Wherein, the ultrasonic rangefinder is used to monitor the vertical distance between the pipeline and the riverbed trench.

4. The method for constructing a river-crossing water supply pipe immersed tube according to claim 1, characterized in that: The method for installing the above-water welding work cabin in step (3): ① Use a crane to hook the above-water welding work cabin and sink it to the bottom of the joint of the two spliced ​​pipes; ② Slowly lifting the water welding work cabin, the water welding work cabin rises to the splicing pipes sleeved on both sides of the butt joint; ③ Using a small boat to approach the water welding work cabin, the construction workers will detachably fix the water welding work cabin on the spliced ​​pipe, and the water welding work cabin and the spliced ​​pipe will be tightly connected. Then, a submersible pump will be placed in the water welding work cabin to drain the water in the water welding work cabin.

5. The method for constructing a river-spanning water supply pipe immersion pipe according to claim 1, characterized in that: In the step (3), the spliced ​​pipe is pulled by a crane ship and floats on the water surface.

6. The method for constructing a river-spanning water supply pipe immersed tube according to any one of claims 1 to 5, characterized in that: In the step (4), water is injected into the water supply pipe section to assist sinking. When the amount of water injected reaches 65% to 70% of the total volume of the water supply pipe section, the pipe section is just in a suspended state. Then, water injection is continued and at the same time, each hanging point is gradually tightened to control the sinking speed of the water supply pipe section and the shape of the water supply pipe section during the sinking process.

7. The method for constructing a river-spanning water supply pipe immersion pipe according to claim 6, characterized in that: In the step (5), when injecting water into the water supply pipe section, the height of one elbow pipe fitting is first adjusted to be lower than the other elbow pipe fitting, and the injected water is concentrated on the elbow pipe fitting at the lower position.

8. The method for constructing a river-spanning water supply pipe immersion pipe according to claim 6, characterized in that: In the step (3), when the spliced ​​pipe is lowered into the water, a rolling element is installed at the bottom of the spliced ​​pipe.

9. The method for constructing a river-crossing water supply pipe immersed tube according to claim 6, characterized in that: In the step (5), before the pipeline is swung, a swing anchor point is set on the shore, the swing anchor point is connected to the water supply pipeline, and then the connection between the spliced ​​pipeline and the anchor point on the shore is released.

10. An above-water welding work cabin used in the immersed tube construction method for a cross-river water supply pipe according to any one of claims 1 to 9, characterized in that: The above-water welding work cabin comprises A cabin, the top of which is open and has two corresponding U-shaped notches; A sealing member, wherein the inner edge of the U-shaped notch is provided with the sealing member; at least two tension adjusting members, wherein the cabin body is provided with the at least two tension adjusting members; and A water inlet is provided at the bottom of the cabin, and a water inlet is installed at the water inlet, and the water inlet is located in the cabin; Wherein, the above-water welding work cabin also includes a water collection well; at least one water collection well is provided at the bottom of the cabin body; the water collection well is connected with the cabin body through a water collection hole opened at the bottom of the cabin body.

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