Anti-collapse device for inner liner of bonding type bimetal composite pipe

Abstract

The invention relates to a bonding type bimetal composite pipe lining collapse prevention device which is characterized in that a flange male end is fixed to a port of a liquid bag through a hexagon socket screw, a male end connector of a liquid bag connecting end is sleeved with a connector female end of a hose connecting end, the liquid bag is communicated with a hose, and the end of a liquid bag unit is connected with an external water source; a pressure sensor and a flow sensor are arranged in the liquid bag, and the liquid bag unit is externally connected with a control unit. In the bonding type composite pipe reeling and laying process, the non-glue area of the bonding type composite pipe is supported in the mode that the liquid bag is inflated with water, and therefore it is guaranteed that in the pipe reeling process, a lining of a pipeline cannot be separated and collapsed due to the cyclic bending effect; the liquid bag and the hose are assembled on the land and then placed into the pipeline through the intelligent pipe cleaner, additional design does not need to be conducted on pipe reeling equipment, the efficiency of the pressure testing and pressure charging and releasing process is higher, the efficiency of pipe reeling laying is improved, meanwhile, the additional load of the pipeline in the pipe reeling laying process is effectively reduced, and the operation safety is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of submarine pipeline laying, and in particular relates to a bonding type bimetallic composite pipe liner anti-collapse device. Background Art

[0002] The coiled pipe laying method is currently the most efficient method for laying submarine pipelines. It is a coiled pipe laying process in which the pre-welded pipe is first rolled onto a drum at the dock and then transported to the designated sea area by a special pipe laying ship for laying. During the laying process of the pipeline, the pipeline will be subjected to axial tension, positive and reverse bending loads, and will come into contact with the drum, causing plastic strain and elliptical deformation of the pipeline. For bimetallic composite pipes, this process will also cause the collapse and buckling of the pipeline lining, thereby affecting the bearing capacity of the pipeline. For bonded bimetallic composite pipes, the collapse and failure of the lining can be alleviated by using adhesives between the inner and outer pipes to generate bonding force. However, since the ends of the pipeline need to be connected by surfacing, there will be at least 1 to 2 cm of glue-free area at the ends of the pipe section. This area is the weak point that is most prone to wrinkling and collapse of the lining.

[0003] In order to solve this problem, the international community currently usually adopts the method of increasing the wall thickness of the lining to improve the anti-buckling ability of the pipeline, but this will significantly increase the material cost. Another method is the synchronous water pressure method, that is, during the process of laying or unwinding the pipe, a pair of movable "intelligent pipe cleaners" are used to isolate the curved section of the composite pipe section by section and apply water pressure. When the contact between the pipe and the reel is stable, the next pipe end is pressurized until the reeling of the entire pipeline is completed. However, while this method improves the anti-buckling ability, it also requires special equipment with a complex structure, which greatly affects the laying efficiency and increases the laying cost. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a bonded bimetallic composite pipe lining anti-collapse device. The anti-collapse structure can be used in the winding, unwinding and straightening processes, which can effectively solve the problems of weak bearing capacity in the non-glue area and easy collapse of the lining, reduce construction costs and improve laying efficiency.

[0005] The present invention solves the technical problem by the following technical solutions:

[0006] A bonded bimetallic composite pipe liner anti-collapse device comprises a plurality of sac units arranged in the bimetallic composite pipe, the sac unit comprises a sac and a hose connected to flanges at both ends of the sac, the flange male end is fixed to the sac port by a hexagon socket bolt, the male end joint of the sac connection end is inserted into the interface female end of the hose connection end, the sac is communicated with the hose, the end of the sac unit is connected to an external water source, a pressure sensor and a flow sensor are arranged in the sac, the sac unit is externally connected to a control unit, the control unit comprises a console, a hydraulic pump, an air compressor and a pressure control valve, the pressure sensor is connected to the console via the pressure control valve and the air compressor, the flow sensor is connected to the console via the hydraulic pump, the console controls the hydraulic pump to fill the sac unit with water from the external water source so that the sac expands, and the sac is completely fitted with the inner wall of the bimetallic composite pipe.

[0007] Moreover, the arrangement position of the liquid capsule unit covers the glue-free area of ​​the bimetallic composite tube.

[0008] Moreover, the bonding length between the liquid capsule of the liquid capsule unit and the bimetallic composite pipe after expansion is 20 cm.

[0009] Moreover, the calculation formula of the sac expansion volume V of the sac unit is:

[0010]

[0011] Where: D is the diameter of the pipe, h is the required length of the pipe fitting end, and R is the radius of the selected airbag after expansion.

[0012] The positive effects that the present invention can produce are:

[0013] 1. In the process of laying the adhesive composite pipe by rolling, the adhesive-free area of ​​the adhesive composite pipe is supported by expanding the liquid bag with water, thereby ensuring that the inner lining of the pipe will not separate and collapse due to cyclic bending during the pipe rolling process;

[0014] 2. The liquid capsules of the present invention are connected by a hose. The size of the hose and the liquid capsule can be adjusted according to the geometric conditions of the pipeline, and water is filled and discharged through a pressure control system. The system structure can be used for pipelines of different sizes and can be recycled after the water is discharged;

[0015] 3. The liquid bag and the hose in the present invention are assembled on land, and then placed inside the pipeline through the intelligent pig. No additional design is required on the pipe coiling equipment. Compared with the existing pig sealing solution of the synchronous water pressure method, the pressure test and pressure filling and unloading process are more efficient, which improves the efficiency of the pipe coiling laying.

[0016] 4. The present invention uses a water flow control unit to fill the liquid bag with water, and the diameter of the hose is much smaller than that of the pipe, so the main weight comes only from the water in the liquid bag. Compared with the existing full-length pipeline synchronous water pressure method, the required pressurization length of the present invention is only about 20cm, reducing the weight of the additional water by more than 90%. It effectively reduces the additional load of the pipeline during the coil laying process and improves the safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a working flow chart of the control unit of the present invention;

[0019] Figure 3 FIG. 4 is a signal transmission path diagram of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0021] like Figure 1 As shown, a bonding type bimetallic composite pipe liner anti-collapse device, the innovation of which lies in: comprising a plurality of liquid capsule units arranged in the bimetallic composite pipe, the liquid capsule unit comprising a liquid capsule and a hose connected to flanges at both ends of the liquid capsule, the male end of the flange being fixed to the liquid capsule port by a hexagon socket bolt, the male end joint of the liquid capsule connecting end being sleeved into the female end of the interface of the hose connecting end, the liquid capsule being communicated with the hose, the end of the liquid capsule unit being connected to an external water source, a pressure sensor and a flow sensor being arranged in the liquid capsule, the liquid capsule unit being externally connected to a control unit, the control unit comprising a console, a hydraulic pump, an air compressor and a pressure control valve, the pressure sensor being connected to the console via the pressure control valve and the air compressor, the flow sensor being connected to the console via the hydraulic pump, the console controlling the hydraulic pump to operate to fill the liquid capsule unit with water from an external water source so that the liquid capsule expands, and the liquid capsule is completely fitted with the inner wall of the bimetallic composite pipe.

[0022] Moreover, the arrangement position of the liquid capsule unit covers the glue-free area of ​​the bimetallic composite tube.

[0023] Moreover, the bonding length between the liquid capsule of the liquid capsule unit and the bimetallic composite pipe after expansion is 20 cm.

[0024] Moreover, the calculation formula of the sac expansion volume V of the sac unit is:

[0025]

[0026] Where: D is the diameter of the pipe, h is the required length of the pipe fitting end, and R is the radius of the selected airbag after expansion.

[0027] The device of the present invention is assembled on land, and then the front end of the device is towed to the initial end of the bonding composite pipe to be laid by using an intelligent pipe cleaner, the device is inserted into the interior of the bimetallic composite pipe, the position of the liquid capsule is adjusted, and after the position of the liquid capsule is fixed, the pressure charging control unit is started, and water is charged into the tail pipeline to expand the liquid capsule, and water is continuously charged until the real-time monitored water pressure value reaches the preset water pressure, and the water pressure is maintained to ensure that all the liquid capsules are evenly expanded and effectively fit the pipeline; after a section of the pipeline is laid, the valve of the pressure charging control unit is opened, the water is discharged at the end of the device, the liquid capsule shrinks back to the state before expansion, and the entire device is recovered at the end of the pipeline, and placed in the next section of the pipeline to repeat the above operation.

[0028] During the pipe rolling process, the bladder needs to be filled with water to expand to a state of full fit with the lining, so as to provide sufficient support for the lining and prevent it from collapsing. Therefore, high-strength and wear-resistant materials must be selected as the bladder material. The layout of the bladder needs to cover the glue-free area of ​​the bonded bimetallic composite pipe, and the bladder of the corresponding size needs to be designed according to the size of the glue-free area of ​​different types of pipes to ensure the support effect. The bladders are connected by hoses, and the length of the hose needs to be determined according to the distance between the glue-free areas, which determines the distance between the two bladders. In the early design and assembly process, the specific position of the bladder must be determined in advance, and the traction end of the intelligent pipe cleaner must be ensured to reach the designated position of the design. After the position is locked and fixed, a little tension is applied to the rear end to prevent the position of the bladder placed inside the pipeline from shifting, resulting in failure to provide effective support for the lining in the glue-free area. This design can ensure that the bladder remains stable during the pipe rolling process and prevent the lining from collapsing.

[0029] The control unit of the present invention can accurately control the flow of liquid in the hose, thereby adjusting the expansion state of the liquid sac. After the pipeline winding or unwinding operation is completed, the liquid sac can be gradually shrunk by releasing the water pressure, which is convenient for the recovery and reuse of the device. It not only ensures that the liquid sac can provide continuous and stable support during the laying of the coiled pipe, but also ensures the convenience of operation and the reusability of the device, thereby improving the efficiency and economy of the entire device. Specifically, the hydraulic power of the control unit comes from the hydraulic pump, which can provide the pressure required to expand the liquid sac, and control the working condition of the hydraulic actuator through the hydraulic control valve. The valve is connected to the hydraulic pump to control the operation of the hydraulic cylinder and the motor.

[0030] like Figures 2-3As shown, a pressure sensor and a flow sensor are installed on each liquid capsule to ensure that each liquid capsule can work normally. These sensors can monitor the strain and pressure of the liquid capsule in real time, and feed back the data to the control unit, so that the control unit can promptly identify and handle the situation of uneven expansion of the liquid capsule or abnormal water flow. The sensors in this system include flow sensors and pressure sensors, which monitor the flow and pressure of the water flow in the system in real time, and feed back to the console for real-time control through optical fiber. Through this real-time monitoring and feedback mechanism, the control unit can quickly adjust when problems are found to ensure the stable operation of the entire water filling and expansion process, avoid the situation where the bearing capacity of the glue-free area is weak due to insufficient support of the liquid capsule, and thus ensure the overall stability of the pipeline lining. The control system determines the pressure of the liquid capsule through the collected sensor data and controls the working status of the system on the computer side.

[0031] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A bonded bimetallic composite pipe liner anti-collapse device, characterized in that: The invention comprises a plurality of liquid capsule units arranged in the bimetallic composite pipe, wherein the liquid capsule unit comprises a liquid capsule and a hose connected to flanges at both ends of the liquid capsule, the male end of the flange is fixed to the liquid capsule port by a hexagon socket bolt, the male end joint of the liquid capsule connection end is inserted into the female end of the interface of the hose connection end, the liquid capsule is communicated with the hose, the end of the liquid capsule unit is connected to an external water source, a pressure sensor and a flow sensor are arranged in the liquid capsule, the liquid capsule unit is externally connected to a control unit, the control unit comprises a console, a hydraulic pump, an air compressor and a pressure control valve, the pressure sensor is connected to the console through the pressure control valve and the air compressor, the flow sensor is connected to the console through the hydraulic pump, the console controls the hydraulic pump to fill the liquid capsule unit with water from the external water source so that the liquid capsule expands, and the liquid capsule is completely fitted with the inner wall of the bimetallic composite pipe.

2. The bonding type bimetallic composite pipe liner anti-collapse device according to claim 1 is characterized in that: The liquid capsule unit is arranged at a position covering the glue-free area of ​​the bimetallic composite tube.

3. The bonding type bimetallic composite pipe liner anti-collapse device according to claim 1, characterized in that: After the liquid capsule of the liquid capsule unit is expanded, the bonding length between the liquid capsule unit and the bimetallic composite pipe is 20 cm.

4. The bonding type bimetallic composite pipe liner anti-collapse device according to claim 1, characterized in that: The calculation formula of the sac expansion volume V of the sac unit is: Where: D is the diameter of the pipe, h is the required length of the pipe fitting end, and R is the radius of the selected airbag after expansion.

Images