Method and apparatus for laying a cable under pressure

Abstract

This invention discloses a method and apparatus for laying optical cables under pressure. The method includes: installing an optical cable throttling device and a flexible hose at the transmitting and receiving ends of the optical cable; deploying a traction cable at the deployment end, with a traction umbrella at the beginning of the traction cable to drive the traction umbrella forward within the pipe; connecting the end of the traction cable to the optical cable; installing flexible hoses at both the transmitting and receiving ends; deploying the traction cable at the deployment end, with a traction umbrella at the beginning of the traction cable to drive the traction umbrella forward within the pipe; connecting the end of the traction cable to the optical cable; retrieving the traction umbrella at the retrieval end; and installing sealing caps on the throttling devices at both the transmitting and receiving ends. After the optical cable is laid, the sealing caps are installed for sealing, and the throttling devices are locked, completing one cycle of laying optical cables under pressure. The apparatus includes: an optical cable throttling device, a connecting flange, a flexible hose, a transmitting and receiving cylinder, a deployment cylinder, and sealing caps. This invention overcomes the problem of laying optical cables within pressurized pipelines.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipeline cable laying under pressure, and in particular to a cable laying method and device under pressure. BACKGROUND

[0002] Prestressed Concrete Cylinder Pipe (PCCP) is a kind of high-performance composite pipe material. PCCP is widely used at home and abroad due to its excellent performance. PCCP pipe uses circumferentially wound prestressed steel wires to keep the concrete compacted. With the passage of time, the steel wires may be corroded and eventually broken, which causes the strength of the pipe at the location to decrease. As the corrosion further develops, more broken wires occur at the same location, and the strength of the pipe significantly decreases, resulting in leakage of the pressurized liquid inside the pipe and a sudden and disastrous pipe burst accident. For broken wire detection, many companies at home and abroad have successively developed and designed broken wire safety warning technology based on acoustic monitoring. These technologies have been successfully applied in PCCP water transmission projects.

[0003] In recent years, it has become a trend to use distributed optical fibers as broken wire monitoring sensors in PCCP projects. The distributed optical fibers can be laid inside or outside the pipe. The laying outside the pipe is generally carried out simultaneously with the laying of the pipe, which cannot be applied to the pipe that has been put into use. The laying inside the pipe generally uses the emptying method, which first empties the pipe and then personnel enter the pipe to lay the optical cable. This method has high construction difficulty and investment. Another method of laying inside the pipe is to lay under pressure without stopping the operation of the pipe. This method can avoid the problems caused by emptying laying. SUMMARY

[0004] The present application provides a cable laying method and device under pressure, which overcomes the problem of laying optical cables inside the pipe under pressure. Details are described below:

[0005] A cable laying method under pressure, the method comprising:

[0006] Installing an optical cable throttling device and a hose at the transmitting and receiving end of the optical cable, and launching a traction cable at the launching end. A traction umbrella is installed at the beginning of the traction cable to drive the traction umbrella to move forward in the pipe. The end of the traction cable is connected with the optical cable.

[0007] Installing a hose at the transmitting and receiving end, respectively, launching a traction cable at the launching end, and installing a traction umbrella at the beginning of the traction cable to drive the traction umbrella to move forward in the pipe. The end of the traction cable is connected with the optical cable. The traction umbrella is recovered at the recovery end, and a sealing cover is installed on the throttling device at the transmitting and receiving ends.

[0008] After the laying of the optical cable is completed, the sealing cover is installed for sealing, and the throttling device is locked, thereby completing a cable laying process under pressure.

[0009] The transceiving end is respectively installed with a hose, specifically

[0010] Close the throttling device, open the ball valve, fix the hose on the transceiving cylinder, and install the transceiving cylinder on the throttling device;

[0011] Open the throttling device, and put the hose;

[0012] Lock the hose, close the throttling device, and withdraw the transceiving cylinder.

[0013] Further, install the launching cylinder on the throttling device; open the throttling device, and push the tow umbrella into the pipeline. The tow umbrella is recovered at the receiving end, specifically as follows:

[0014] 1) Install the transceiving cylinder, which is provided with a support rod for launching the hose and recovering the tow umbrella;

[0015] 2) Open the throttling device, insert the support rod into the pipeline, and provide the support rod with a recovery hook and a camera for recovering the tow umbrella;

[0016] 3) Recover the tow umbrella, and use the recovery hook to recover the tow umbrella when the camera visual range appears the tow umbrella;

[0017] 4) After the tow umbrella is recovered, close the throttling device, and install the launching cylinder. When the launching cylinder is installed, unload the tow umbrella from the tow cable, and pass the tow cable out of the middle hole of the launching cylinder;

[0018] 5) Open the throttling device, and pull the tow cable. The optical cable is dragged by the tow cable to pass through the pipeline, and finally introduced from the throttling device to the outside at the receiving end.

[0019] A cable laying device under pressure, the device comprises: an optical cable throttling device, an adapter flange, a hose, a transceiving cylinder, a launching cylinder and a sealing cover;

[0020] The optical cable throttling device is connected to the ball valve through the adapter flange, the hose is installed in the optical cable throttling device by the transceiving cylinder, the sealing cover is installed above the throttling device, and the optical cable throttling device, the sealing cover and the adapter flange are connected by a clamp;

[0021] The optical cable throttling device comprises: an upper joint, a valve body, a lower joint, a valve core assembly, a fastening assembly and a side cover, and the whole structure is left-right symmetrical; the upper joint and the lower joint are concentric and located on the upper and lower sides of the valve body, and a connecting groove and a connecting groove are respectively arranged on the outer edges of the upper joint and the lower joint;

[0022] The lower joint is provided with a convex edge for fixing and installing the hose, and a mounting hole for installing the fastening assembly, the valve core assembly is located on the left and right sides of the valve body, and comprises a valve rod, a compression nut, a valve core support, a gasket, a sealing ring, a valve core and a fastening piece; the valve core is installed on the valve core support by the fastening piece, and the valve core support is threadedly connected with the valve rod.

[0023] The fastening assembly is located on both sides of the lower joint, and comprises a valve rod, a first nut, a jackscrew, a gasket, a sealing ring and a support; the support is welded on the side of the lower joint, the valve rod and the jackscrew are constrained in the support through the first nut, and the jackscrew is threadedly connected with the valve rod.

[0024] The soft tube comprises an outer groove, an inner groove, a notch, a barrel and joints, the outer groove, the inner groove and the notch are located at one end of the barrel, and a plurality of joints are arranged at the other end of the barrel.

[0025] The receiving barrel comprises a supporting rod, an end cover, a hand screw nut, a sealing ring, a camera support, a soft tube hook, a camera and a barrel,

[0026] The supporting rod passes through the middle hole of the end cover, the camera support and the soft tube hook are arranged at the tail end of the supporting rod, the end cover is arranged on the upper end of the barrel, and the end cover and the supporting rod are sealed by the sealing ring and the hand screw nut; the supporting rod is a hollow steel pipe, and the soft tube hook is provided with a pair of curved convex edges at the tail end.

[0027] Further, the curved convex edges are passed through the notch on the soft tube by the soft tube hook, the supporting rod is rotated to make the soft tube hook rotate in one direction along the inner groove, whether the curved convex edges are in the inner groove is determined according to the position of the curved convex edges in the camera, and the soft tube is controlled to move up and down by moving the supporting rod up and down when the curved convex edges are in the inner groove.

[0028] The delivery barrel comprises an end cover, a compression nut, a jacking rod nut, a jacking rod, a barrel, a sealing ring, a traction cable, a traction umbrella and a joint,

[0029] The end cover is arranged at one end of the barrel, and is provided with the compression nut and the jacking rod nut; the jacking rod passes through the jacking rod nut and is provided with a steel ball at the other end; the traction umbrella is connected with the traction cable through the joint; the traction cable passes through the end cover, the sealing ring and the compression nut in sequence at the other end; and the traction cable is a zero-float cable in which a high-strength Kevlar cable is embedded.

[0030] Further, the sealing cover is arranged above the throttling device and is used for sealing after the optical cable is drawn out, and comprises a clamp mounting groove, a through hole, a second nut, a compression sleeve, a protective sleeve, a sealing ring and a sealing ring compression ring; the optical cable passing through the throttling device passes through the through hole, the sealing ring compression ring, the sealing ring, the compression sleeve and the protective sleeve in sequence.

[0031] The technical scheme provided by the present application has the following beneficial effects:

[0032] 1. The cable laying method under pressure can realize laying of the detection optical cable in the pipeline under pressure, overcomes various disadvantages of the traditional pipeline emptying and cable laying, greatly improves the cable laying efficiency, saves water resources, and reduces the construction difficulty and cost.

[0033] 2. The cable laying device under pressure adopts zero buoyancy traction cable and traction umbrella as an auxiliary way of traction optical cable, which well overcomes the difficulties brought by the physical properties of optical cable itself;

[0034] 3. The cable laying device under pressure designs throttling device, realizes sealing problem in the process of cable laying and clamping problem after cable laying;

[0035] 4. The cable laying device under pressure adopts the same receiving and transmitting barrel to be used for laying hose and recycling traction umbrella, which greatly simplifies construction process;

[0036] 5. The laying hose and the method for fixing the hose provided by the present application well solve the problem of laying hose under pressure;

[0037] 6. The cable laying device under pressure has small structure size, and the middle through hole is only DN50, which not only greatly reduces manufacturing cost, but also reduces possible accidental risk in construction, and the compact structure guarantees high reliability, and the cable laying device under pressure can be matched with and used with various pipe joints. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 it is throttling device's appearance structure diagram;

[0039] Figure 2 it is throttling device's section view;

[0040] Figure 3 it is throttling device's valve body part section view;

[0041] Figure 4 it is adapter flange's structure diagram;

[0042] Figure 5 it is throttling device's installation drawing;

[0043] Figure 6 it is hose's structure diagram;

[0044] Figure 7 it is receiving and transmitting barrel's principle diagram;

[0045] Figure 8 it is the principle diagram that hose lifting hook cooperates with hose;

[0046] Figure 9 it is the schematic diagram of hose installation;

[0047] Figure 10 it is the structure diagram of laying barrel;

[0048] Figure 11 it is the installation drawing of laying barrel;

[0049] Figure 12 it is the schematic diagram of traction umbrella lifting hook structure and installation;

[0050] Figure 13 Schematic diagram of the parachute recovery;

[0051] Figure 14 Structural diagram of the sealing cover;

[0052] Figure 15 Effect diagram after installation.

[0053] In the drawings, the components represented by each reference numeral are listed as follows:

[0054] 1: throttling device; 10: first joint; 100: connecting groove;

[0055] 11: valve body; 110: valve body chamber; 12: lower joint;

[0056] 121: convex edge; 13: valve core assembly; 130: valve rod;

[0057] 131: first compression nut; 132: valve core support; 133: first gasket;

[0058] 134: first sealing ring; 135: valve core; 136: fastener;

[0059] 14: fastening assembly; 140: valve rod; 141: first nut;

[0060] 142: jackscrew; 143: second gasket; 144: second sealing ring;

[0061] 145: support; 15: side cover; 2: adapter flange;

[0062] 20: fixed seat; 21: second joint; 3: hose;

[0063] 30: outer groove; 31: inner groove; 32: notch;

[0064] 33: first barrel; 34: joint; 4: transceiver barrel;

[0065] 40: support rod; 41: first end cover; 42: hand screw nut;

[0066] 43: third sealing ring; 44: camera support; 45: hose hook;

[0067] 450: convex edge; 46: camera; 460: cable;

[0068] 47: second barrel; 48: parachute hook; 480: short hook;

[0069] 481: long hook; 5: launching barrel; 50: second end cover;

[0070] 51: second compression nut; 52: ejector rod nut; 53: ejector rod;

[0071] 530: steel ball; 54: cylinder; 55: fourth sealing ring;

[0072] 56: traction cable; 57: traction umbrella; 58: third joint;

[0073] 6: sealing cover; 60: clamp mounting groove; 61: through hole;

[0074] 62: second nut; 63: compression sleeve; 64: protective sleeve;

[0075] 65: fifth sealing ring; 66: sealing ring compression ring; 7: clamp;

[0076] 8: ball valve; 9: optical cable. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application are described in further detail below.

[0078] Example 1

[0079] Referring to Figures 1 to 15 , the technical solution adopted by the embodiments of the present application is to set throttling devices at both ends of the pipeline optical cable and to use a traction cable to pass the optical cable through the pipeline. The steps of the method are as follows:

[0080] 1. Installing optical cable throttling devices at the optical cable transmitting and receiving ends

[0081] 1) Determining the launching and recovery points. The detection of the optical cable launching and recovery points depends on the distribution of the pipeline butterfly valves and the distance between two valve wells. In the embodiments of the present application, the launching and recovery distance is set to be within 2 kilometers. Within this range, a pair of adjacent butterfly valves can be used as a launching point and a recovery point.

[0082] 2) Installing two throttling devices on both sides of the butterfly valve at the selected optical cable launching and recovery points. The throttling devices are used to prevent the fluid in the pipeline from spouting out during the launching of the optical cable. When installing, it is necessary to ensure that the corresponding connection interface has been opened above the pipeline. In the embodiments of the present application, a DN65 ball valve is used as the connection interface, and other commonly used valves can be selected from DN50, DN75 and DN100. In addition, it is necessary to ensure that the upper edge of the DN65 ball valve is less than 0.5 meters from the top of the pipeline, and the operating space above is not less than 3 meters (this condition is generally met in the construction of valve wells, and is not considered in open-air construction points). After ensuring that the construction conditions are met, the adapter flange is installed on the ball valve (the embodiments of the present application refer to the DN65 ball valve by default).

[0083] 2, the transceiver is respectively installed with a hose. The hose is used to protect the detection optical cable and to guide the optical cable when it is put into the pipe.

[0084] 1) Close the throttle device and open the ball valve. In order to install the hose, the ball valve needs to be opened, and before opening, the throttle device needs to be closed to avoid the fluid in the pipe from being sprayed outside;

[0085] 2) Fix the hose on the transceiver barrel and install the transceiver barrel on the throttle device;

[0086] 3) Open the throttle device and put in the hose;

[0087] 4) Lock the hose, close the throttle device, and withdraw the transceiver barrel. The locking structure is located below the throttle device and is used to lock the hose to prevent the hose from sliding up and down.

[0088] 3, put in the traction cable at the put-in end. The traction cable is provided with a traction umbrella at the beginning, which is used to drive the traction umbrella to move forward in the pipe. The end of the traction cable is connected with the optical cable. The purpose of using the traction cable is that the optical cable to be laid generally has a greater density than the fluid in the pipe, so it cannot be directly pulled by the traction umbrella. The zero-buoyancy traction cable can avoid the above problems.

[0089] 1) Install the put-in barrel on the throttle device;

[0090] 2) Open the throttle device and push the traction umbrella into the pipe. The traction umbrella is folded and placed in the put-in barrel. The traction umbrella is pushed into the pipe by the jacking rod on the put-in barrel, and under the impact of the fluid in the pipe, the traction umbrella drives the traction cable to move forward.

[0091] 4, recover the traction umbrella at the recovery end

[0092] 1) Install the transceiver barrel, which is provided with a support rod and can be used to put in the hose and recover the traction umbrella;

[0093] 2) Open the throttle device and insert the support rod into the pipe. The support rod is provided with a recovery hook and a camera, which are used to recover the traction umbrella;

[0094] 3) Recover the traction umbrella. When the traction umbrella appears in the visual range of the camera, the traction umbrella is recovered by the recovery hook;

[0095] 4) After the traction umbrella is recovered, close the throttle device and install the put-in barrel. When the put-in barrel is installed, the traction umbrella is unloaded from the traction cable, and the traction cable is pulled out from the middle hole of the put-in barrel;

[0096] 5) Open the throttle device and pull the traction cable. The optical cable is pulled through the pipe by the traction cable, and finally it is led out of the throttle device at the recovery end.

[0097] 5. Installing the sealing cover on the throttling device at both ends of the transmission. After the cable is laid, install the sealing cover to seal, and lock the throttling device, complete the cable laying process with pressure.

[0098] Embodiment 2

[0099] In order to realize the above method, referring to Figures 1 to 15 , the embodiment of the present application provides a set of cable laying device with pressure, which comprises: throttling device 1, adapter flange 2, hose 3, transceiver barrel 4, launching barrel 5 and sealing cover 6. The throttling device 1 is connected to the ball valve 8 through the adapter flange 2, the hose 3 is installed in the throttling device 1 by the transceiver barrel 4, the sealing cover 6 is installed above the throttling device 1, and the throttling device 1 is connected with the sealing cover 6 and the adapter flange 2 by the clamp 7.

[0100] As shown in Figures 1 to 3 , the throttling device 1 comprises: upper joint 10, valve body 11, lower joint 12, valve core assembly 13, fastening assembly 14 and side cover 15, which are symmetrical in structure. The upper joint 10 and the lower joint 12 are concentric and located on the upper and lower sides of the valve body 11, and the outer edges of the upper joint 10 and the lower joint 12 are respectively provided with connecting grooves 100 and 120 for connecting with other parts. The lower joint 12 is provided with a convex edge 121 for fixing and installing the hose 3, and a mounting hole for installing the fastening assembly 14. The valve core assembly 13 is located on the left and right sides of the valve body 11, which is composed of valve stem 130, compression nut 131, valve core support 132, gasket 133, sealing ring 134, valve core 135 and fastener 136. The valve core 135 is installed on the valve core support 132 through the fastener 136, and the valve core support 132 is threadedly connected with the valve stem 130. When the valve stem 130 rotates, the valve core support 132 drives the valve core 135 to move up and down in the valve body cavity 110 along the valve stem 130. Since the valve core assembly 13 is symmetrically distributed, the two valve cores 135 realize the opening and closing function under the control of the valve stem 130, corresponding to the opening and closing of the throttling device 1. The fastening assembly 14 is located on both sides of the lower joint 12, which comprises: valve stem 140, first nut 141, top wire 142, gasket 143, sealing ring 144 and support 145. The support 145 is welded on the side of the lower joint 12, and the valve stem 140 and the top wire 142 are constrained in the support 145 by the first nut 141, and the top wire 142 is threadedly connected with the valve stem 140. When the valve stem 140 rotates, the top wire 142 moves up and down along the valve stem 140. The function of the top wire 142 is to fix the hose 3 and limit the upward sliding of the hose 3 in the throttling device 1.

[0101] As shown in Figure 4 , 5 , the adapter flange 2 comprises: fixed seat 20 and joint 21, the fixed seat 20 is used for connecting the ball valve 8, and the joint 21 is used for connecting with the lower joint 12 on the throttling device 1.

[0102] Figure 6 The structure of the hose 3 is shown in the figure, including: outer groove 30, inner groove 31, notch 32, barrel 33 and joint 34. The outer groove 30, inner groove 31 and notch 32 are located at one end of the barrel 33, and the other end of the barrel is provided with a plurality of joints 34, the number of which can be arbitrarily set, and in the embodiment of the present application, there are five joints 34, which can flexibly rotate and bend between the joints 34. The outer groove 30 cooperates with the top wire 142 on the fastening assembly 14, and is used for limiting the hose 3, and the inner groove 31 and the notch 32 are used for placing the hose.

[0103] As shown in the figure, Figure 7 The transceiver barrel 4 includes: support rod 40, end cover 41, hand screw nut 42, sealing ring 43, camera bracket 44, hose hook 45, camera 46 and barrel 47. The support rod 40 passes through the middle hole on the end cover 41, and the end is installed with the camera bracket 44 and the hose hook 45. The end cover 41 is installed on the upper end of the barrel 47, and the sealing ring 43 and the hand screw nut 42 are used between the end cover 41 and the support rod 40 for sealing. The support rod 40 is a hollow steel pipe, which is used to lead out the cable 460 of the camera 46. The hose hook 45 is provided with a pair of curved flanges 450 at the end, which are used to hook the hose 3, and the hose hook 45 can be replaced.

[0104] As shown in the figure, Figure 8 , 9 In the specific implementation, the method step 2 is adopted to pass the curved flange 450 through the notch 32 on the hose 3 by using the hose hook 45, and rotate the support rod 40 to make the hose hook 45 rotate in one direction along the inner groove 31, and judge whether it has been in the inner groove 31 according to the position of the curved flange 450 in the camera 46, when the curved flange 450 is in the inner groove 31, the up and down movement of the support rod 40 can be used to control the up and down movement of the hose 3. During the placement of the hose 3, when the outer groove 30 of the hose 3 moves to the top wire 142, it will also reach the flange 121 in the lower connector 12 at the same time, so it is clamped and the hose 3 cannot move downward. At the same time, the locking fastening assembly 14 limits the upward movement of the hose 3.

[0105] The structure of the placement barrel 5 is shown in the figure, Figure 10As shown, it includes: an end cap 50, a clamping nut 51, a push rod nut 52, a push rod 53, a cylinder 54, a sealing ring 55, a traction cable 56, a traction umbrella 57, and a connector 58. The end cap 50 is installed at one end of the cylinder 54, and has a clamping nut 51 and a push rod nut 52 on it. The push rod 53 passes through the push rod nut 52, and the other end has a steel ball 530. The steel ball 530 protects the umbrella surface from damage when the traction umbrella 57 is pushed downwards. The traction umbrella 57 is connected to the traction cable 56 via the connector 58. The other end of the traction cable 56 passes through the end cap 50, the sealing ring 55, and the clamping nut 51 in sequence. The traction cable 56 preferably uses a zero-buoyancy, high-strength Kevlar-embedded cable. Before installing the deployment cylinder 5, the traction umbrella 57 is folded and placed inside the cylinder 54, and then installed above the throttling device 1, as shown. Figure 11 As shown.

[0106] When recovering the parachute, a launcher / receiver 4 is used. Specifically, the hose hook 45 at the end of the support rod 40 of the launcher / receiver 4 is replaced with a parachute hook 48. The structure of the parachute hook 48 is as follows: Figure 12 As shown, it is equipped with a short hook 480 and a long hook 481, which is beneficial for better recovery of the towing parachute 57. Figure 13 The diagram shows the principle of retrieval of the traction umbrella. When the traction umbrella 57 appears in the line of sight of the camera 46, the traction umbrella 57 is hooked by the traction umbrella hook 48 by rotating the support rod 40, thereby dragging the traction umbrella 57 outside the pipe.

[0107] like Figure 14 , 15 As shown, the sealing cap 6 is installed above the throttling device 1 and serves as a seal after the optical cable 9 is led out. Specifically, it includes: a clamp mounting groove 60, a through hole 61, a second nut 62, a pressure sleeve 63, a protective sleeve 64, a sealing ring 65, and a sealing ring pressure ring 66. The optical cable 9 passing through the throttling device 1 will sequentially pass through the through hole 61, the sealing ring pressure ring 66, the sealing ring 65, the pressure sleeve 63, and the protective sleeve 64. The order in which the optical cable 9 passes through is also the installation order of these parts. After installing the sealing cap 6, a pressurized cable laying is completed, and the finished effect is as shown. Figure 15 As shown.

[0108] Unless otherwise specified, the model numbers of the various devices in this embodiment of the invention are not limited, and any device that can perform the above functions is acceptable.

[0109] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cable laying under pressure device, characterized in that, The device comprises a cable throttling device, an adapter flange, a hose, a transceiver barrel, a launching barrel and a sealing cover; The cable throttling device is connected to a ball valve through the adapter flange, the hose is installed inside the cable throttling device by using the transceiver barrel, the sealing cover is installed above the throttling device, and the cable throttling device, the sealing cover and the adapter flange are connected by using a clamp; The cable throttling device comprises an upper joint, a valve body, a lower joint, a valve core assembly, a fastening assembly and a side cover, and the overall structure is symmetrical to the left and right; the upper joint and the lower joint are concentric and located on the upper and lower sides of the valve body, and a connecting groove and a connecting groove are respectively arranged on the outer edges of the upper joint and the lower joint; The lower joint is provided with a convex edge for fixing and installing the hose and a mounting hole for installing the fastening assembly, the valve core assembly is located on the left and right sides of the valve body and is composed of a valve rod, a compression nut, a valve core support, a gasket, a sealing ring, a valve core and a fastener; the valve core is installed on the valve core support through the fastener, and the valve core support is threadedly connected with the valve rod; The fastening assembly is located on the two sides of the lower joint and comprises a valve rod, a first nut, a jackscrew, a gasket, a sealing ring and a support; the support is welded on the side surface of the lower joint, the valve rod and the jackscrew are constrained in the support through the first nut, and the jackscrew is threadedly connected with the valve rod; The hose comprises an outer groove, an inner groove, a notch, a barrel and a joint; the outer groove, the inner groove and the notch are located at one end of the barrel, and a plurality of joints are arranged at the other end of the barrel; The curved convex edges are passed through the notch on the hose by using the hose hook, the support rod is rotated to make the hose hook rotate in one direction along the inner groove, whether the curved convex edges are in the inner groove is determined according to the position of the curved convex edges in the camera, and the upward and downward movement of the hose is controlled by moving the support rod up and down when the curved convex edges are in the inner groove.

2. A cable laying under pressure device according to claim 1, characterized in that The transceiver barrel comprises a support rod, an end cover, a hand screw nut, a sealing ring, a camera support, a hose hook, a camera and a barrel, The support rod passes through the middle hole of the end cover, the camera support and the hose hook are installed at the tail end of the support rod, the end cover is installed on the upper end of the barrel, and the end cover and the support rod are sealed by using the sealing ring and the hand screw nut; the support rod is a hollow steel pipe, and the tail end of the hose hook is provided with a pair of curved convex edges.

3. A cable laying under pressure device according to claim 1, characterized in that The launching barrel comprises an end cover, a compression nut, a jacking rod nut, a jacking rod, a barrel, a sealing ring, a traction cable, a traction parachute and a joint, The end cover is installed at one end of the barrel and is provided with the compression nut and the jacking rod nut thereon, the jacking rod passes through the jacking rod nut and is provided with a steel ball at the other end, the traction parachute is connected to the traction cable through the joint, the other end of the traction cable passes through the end cover, the sealing ring and the compression nut in sequence, and the traction cable is a zero-buoyancy cable embedded with high-strength Kevlar.

4. A cable under pressure laying apparatus as claimed in claim 1, wherein, The sealing cover is installed above the throttling device and is used for sealing after the optical cable is led out, and comprises a clamp mounting groove, a through hole, a second nut, a compression sleeve, a protective sleeve, a sealing ring and a sealing ring compression ring; The optical cable passing through the throttling device will pass through the through hole, the sealing ring compression ring, the sealing ring, the compression sleeve and the protective sleeve in sequence.

5. A method of laying a cable under pressure based on the laying device under pressure according to any one of claims 1 to 4, characterized in that The method comprises: A cable throttling device and a hose are installed at the cable transceiver end, a traction cable is launched at the launching end, a traction parachute is installed at the beginning of the traction cable to drive the traction parachute to move forward in the pipe, and the tail end of the traction cable is connected to the optical cable; The soft tubes are respectively installed at the transmitting and receiving ends, the towing cable is put at the launching end, the towing umbrella is installed at the beginning of the towing cable, the towing umbrella is used to drive the towing umbrella to move forward in the pipe, the end of the towing cable is connected with the optical cable, the towing umbrella is recovered at the receiving end, and the sealing covers are installed on the throttling devices at the transmitting and receiving ends; After the optical cable is laid, the sealing covers are installed to seal, the throttling devices are locked, and the once pressure-carrying cable laying process is completed.

6. The method of claim 5, wherein, The transmitting and receiving ends are respectively installed with the soft tubes, and the transmitting and receiving ends are respectively installed with the soft tubes. The throttling device is closed, the ball valve is opened, the soft tube is fixed on the transmitting and receiving cylinder, and the transmitting and receiving cylinder is installed on the throttling device. The throttling device is opened, and the soft tube is put. The soft tube is locked, the throttling device is closed, and the transmitting and receiving cylinder is withdrawn.

7. The method of claim 5, wherein, The launching cylinder is installed on the throttling device, and the throttling device is opened.

8. The method of claim 5, wherein, The towing umbrella is recovered at the receiving end, and the towing umbrella is recovered at the receiving end. 1) The transmitting and receiving cylinder is installed, and the transmitting and receiving cylinder is provided with a supporting rod, which is used to put the soft tube and recover the towing umbrella; 2) The throttling device is opened, the supporting rod is inserted into the pipe, the supporting rod is provided with a recovery hook and a camera, and the supporting rod is used to recover the towing umbrella; 3) The towing umbrella is recovered, and the towing umbrella is recovered by the recovery hook when the towing umbrella appears in the visual range of the camera; 4) After the towing umbrella is recovered, the throttling device is closed, the launching cylinder is installed, the towing umbrella is unloaded from the towing cable, and the towing cable is pulled out from the middle hole of the launching cylinder; 5) The throttling device is opened, and the towing cable is pulled; the optical cable is pulled by the towing cable, passes through the pipe, and is finally led out of the throttling device at the receiving end.

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