Prefabricated waterproof fixed joint for cable working well and method thereof

Abstract

The present invention discloses a prefabricated waterproof fixed joint for a cable working well and a method thereof. The fixed joint comprises: a waterproof joint body, which comprises a first body and a second body, the waterproof joint body is provided with a through hole, which comprises a first section through hole of the first body and a second section through hole of the second body, the cable pipe is inserted into the first section through hole, and the cable is inserted into the cable pipe through the second section through hole; a multi-stage filling seal is arranged in the second section through hole, the inner wall diameter of the multi-stage filling seal matches the outer diameter of the cable, and the outer wall diameter matches the diameter of the second section through hole; a locking cap is threadedly connected with the second body; and a sealing retaining ring is located outside the multi-stage filling seal. The advantages are: the fixed joint can effectively solve the sealing problem of the cable, the cable pipe and the wellhead of the cable working well, eliminate the problem of leakage water flowing into the cable working well along the cable pipe, thereby effectively avoiding the problem of water accumulation and mutual flow between different cable working wells.

Description

Technical Field

[0001] The invention relates to the technical field of electric power engineering, and in particular to a prefabricated waterproof fixed joint for a cable working well and a method thereof. Background Art

[0002] Cable wells (cable working wells), referred to as wells, are an important part of power facilities. In power pipe laying projects, according to the requirements of cable laying and operation, cable wells need to have high waterproof properties, and the wells need to be kept dry and free of water. Since my country has not yet promulgated the design specifications for such underground small and medium-sized wells, it can only refer to the relevant load specifications and concrete specifications for construction and pouring. However, in actual applications, there will be cracks in the structural walls of the wells, and groundwater will seep into the cracks. Because the cable pipe interface is not tightly connected to the working well, groundwater will also enter from the cable pipe interface. In the underground pipe network, when a well is infiltrated and water enters, if the cable pipe and the well inlet are not well sealed, the accumulated water will also flow into other wells along the pipeline, causing inconvenience to the cable construction, operation, monitoring, and maintenance, and even creating new potential faults. During the cable laying construction process, a large traction force is required to drag the cable to complete the pipe threading work. In this process, the traditional pipe laying process often damages the pipe, causing the pipe mouth to be damaged and deformed, which in turn brings difficulties to the sealing and water blocking of the cable pipe.

[0003] In order to solve the above problems, various power construction units have proposed a construction method for prefabricated work pits, which can simplify the on-site construction process of the work pits, shorten the construction period, and reduce the impact on road traffic. In the prefabricated work pit, square openings for cable threading will be reserved on the side panels on both sides, and on-site plugging construction will be carried out in the later construction. However, due to the difficulties in the underground construction process and the influence of water accumulation, it often leads to water leakage between the later construction wall and the wall of the prefabricated work pit, and water leakage between the construction wall and the cable drainage pipe, making the construction between the construction wall and the cable more difficult. Summary of the invention

[0004] The object of the present invention is to provide a prefabricated waterproof fixed joint for a cable working well and a method thereof. The fixed joint combines a waterproof joint body, a multi-stage filling seal, a locking cap and a sealing retaining ring, which can effectively solve the sealing problem of cables, cable pipes and cable working wells, and eliminate the problem of leaking water flowing into the cable working well along the cable pipe, thereby effectively avoiding the problem of water accumulation and mutual flow between different cable working wells; in addition, the installation method of the prefabricated waterproof fixed joint for the cable working well of the present invention adopts modular installation, simplifies the construction process, and ensures better waterproof effect.

[0005] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0006] A prefabricated waterproof fixed joint for a cable working well, the joint comprising:

[0007] A waterproof connector body, comprising a first body and a second body connected thereto, the waterproof connector body being provided with a through hole, the through hole comprising a first section through hole of the first body and a second section through hole of the second body, the diameter of the first section through hole matching the outer diameter of the cable tube, the diameter of the second section through hole being smaller than the diameter of the first section through hole, the cable tube being inserted into the first section through hole, the cable passing through the second section through hole and being inserted into the cable tube;

[0008] A multi-stage filling seal, composed of a plurality of filling seals with different radii, which is arranged in the second section through hole, wherein the inner wall diameter of the multi-stage filling seal matches the outer diameter of the cable, and the outer wall diameter thereof matches the diameter of the second section through hole;

[0009] A locking cap, connected to the second body through threads;

[0010] A sealing retaining ring is arranged in the locking cap and connected to the locking cap. The sealing retaining ring is located outside the multi-stage filling seal.

[0011] Preferably, the second body comprises:

[0012] a channel portion connected to the first body;

[0013] A transition connector is formed by extending the channel portion outwardly, and a threaded structure is arranged on the outer side of the transition connector and is threadedly connected to the locking cap.

[0014] Preferably, the inner side wall of the port of the transition connection piece away from the channel portion is a conical structure, and the outer side wall of the multi-stage filling seal matches the conical structure.

[0015] Preferably, the multi-stage filling seal includes a first-stage filling seal and a second-stage filling seal, the second-stage filling seal is sleeved on the first-stage filling seal, the inner wall diameter of the first-stage filling seal matches the outer diameter of the cable, and the outer wall diameter of the second-stage filling seal matches the diameter of the second section of the through hole.

[0016] Preferably, the inner wall diameter of the first port of the locking cap away from the second body is smaller than the inner wall diameter of the second port on the other side, the diameter of the sealing ring is larger than the inner wall diameter of the first port, and the sealing ring is arranged between the first port and the waterproof joint body;

[0017] And / or, the sealing retaining ring side wall includes a threaded structure, and the sealing retaining ring is threadably connected to the locking cap.

[0018] Preferably, a plurality of circles of first sealing structures are provided on the inner side wall of the first body and / or the second body, and a plurality of first sealing members are respectively placed in the first sealing structures;

[0019] And / or, a plurality of dovetail grooves are provided on the outer side walls of the first body and / or the second body, and a dedicated connection block matching the dovetail grooves is inserted into the dovetail grooves of the two waterproof joint bodies to connect the two waterproof joint bodies;

[0020] And / or, a plurality of circles of second sealing structures are provided on the outer side walls of the first body and / or the second body, and a plurality of second sealing members are respectively placed in the second sealing structures.

[0021] Preferably, the multi-stage filling seal and / or the sealing retaining ring are composed of semicircular half blocks;

[0022] And / or, the diameter of the second section of the through hole is the same as the inner diameter of the cable conduit.

[0023] Preferably, the transition connector comprises engineering plastic, nylon or a composite material, and the first main body and the channel portion comprise reinforced concrete, engineering plastic, nylon or a composite material;

[0024] and / or, the multi-stage filling seal and / or the first seal and / or the second seal comprises a material that swells in contact with water;

[0025] And / or, the first body and / or the outer side wall of the channel portion is a cubic structure;

[0026] And / or, the first main body and / or the channel portion and / or the transition connector are integrally formed.

[0027] Preferably, it also comprises:

[0028] A cable dragging protection ring, wherein the locking cap is provided with a plurality of auxiliary locking holes with a threaded structure, and the cable dragging protection ring is provided with a plurality of corresponding through holes, and a plurality of bolts pass through the through holes and are screwed into the auxiliary locking holes to fix the cable dragging protection ring on the locking cap, and the inner side of the cable dragging protection ring is a bearing structure.

[0029] Preferably, a method for installing a cable using the prefabricated waterproof fixed joint for the cable working well comprises the following steps:

[0030] S1. Install several assembled cable working wells to the predetermined positions of the cable working wells with prefabricated waterproof fixed joints, ensure that the cable drain pipe is inserted into the waterproof joint body, insert the special connection block into the dovetail groove of the adjacent waterproof joint body, and lock and connect the adjacent waterproof joint bodies;

[0031] S2. When laying cables, unscrew the locking cap and take out the multi-stage filling seal and sealing retaining ring;

[0032] S3. Lock the locking cap and the waterproof connector body;

[0033] S4. Drag the cable traction rope, pass the cable through the cable drag protection ring, the locking cap and the through hole of the waterproof connector body, and insert it into the cable drain pipe;

[0034] S5. After the cable is in place, unscrew the locking cap and install the multi-stage filling seal into the second section through hole;

[0035] S6, placing the sealing retaining ring between the locking cap and the second body;

[0036] S7. Tighten the locking cap and the waterproof connector body, squeeze the multi-stage filling seal through the transition connector, and ensure that the multi-stage filling seal has sufficient deformation to seal the inner hole gap between the cable and the waterproof connector body.

[0037] Compared with the prior art, the present invention has the following advantages: the prefabricated waterproof fixed joint for the cable working well of the present invention combines a waterproof joint body, a multi-stage filling seal, a locking cap and a sealing retaining ring, which can effectively solve the sealing problem of cables, cable pipes and the wellhead of the cable working well, and eliminates the problem of leakage water flowing into the cable working well along the cable pipe, thereby effectively avoiding the problem of water accumulation and mutual flow between different cable working wells; in addition, the installation method of the prefabricated waterproof fixed joint for the cable working well of the present invention adopts modular installation, simplifies the construction process, and ensures better waterproof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the structure of a prefabricated waterproof fixed joint for a cable working well of the present invention;

[0039] Figure 2 It is a cross-sectional schematic diagram of a prefabricated waterproof fixed joint for a cable working well;

[0040] Figure 3 Schematic diagram of fixing multiple cables with prefabricated waterproof fixing joints in multiple cable working shafts. DETAILED DESCRIPTION

[0041] The present invention will be further described below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0042] like Figure 1 and Figure 2 As shown in combination, a prefabricated waterproof fixed joint for a cable working shaft of the present invention is shown, and the joint comprises: a waterproof joint body 1, a multi-stage filling seal 2, a locking cap 3 and a sealing retaining ring 4.

[0043] The waterproof joint body 1 is used to fill the space of the square holes reserved on both sides of the cable working well. Different numbers of waterproof joint bodies 1 can be placed according to the design requirements of the cable working well. The waterproof joint body 1 includes a first body 11 and a second body 12 connected thereto. A through hole is opened in the waterproof joint body 1. The through hole includes a first section of through holes in the first body 11 and a second section of through holes in the second body 12. The diameter of the first section of through holes matches the outer diameter of the cable tube 7. The diameter of the second section of through holes is smaller than the diameter of the first section of through holes. The cable tube 7 is inserted into the first section of through holes. The cable 8 passes through the second section of through holes and is inserted into the cable tube 7. The second body 12 is connected to the locking cap 3 by threads. In this embodiment, the diameter of the second section of through holes is the same as the inner diameter of the cable tube 7.

[0044] The inner wall of the first main body 11 is provided with a plurality of circles of first sealing structures, and a plurality of first sealing members 111 are respectively placed in the first sealing structures. The first sealing members 111 are placed in the first sealing structures to ensure the sealing between the cable tube 7 and the first main body 11. The inner diameter of the first sealing member 111 matches the outer diameter of the cable tube 7. When the cable tube 7 is inserted into the first main body 11, the first sealing member 111 can effectively fill the gap between the first main body 11 and the cable tube 7, thereby preventing groundwater from entering the cable working well. In this embodiment, the first main body 11 includes a first sealing structure, the first sealing structure is a sealing groove, and the first sealing member 111 is a sealing ring containing a water-swellable material, and its sealing performance is better when soaked in groundwater. Preferably, the first sealing member 111 is a rubber-based sealing ring.

[0045] The second body 12 comprises: a channel portion 121 and a transition piece 122. The channel portion 121 is connected to the first body 11; the transition piece 122 is formed by extending the channel portion 121 outwardly, and the outer wall of the transition piece 122 is a threaded structure, which is threadedly connected to the locking cap 3.

[0046] In this embodiment, the inner side wall of the port of the transition connector 122 away from the channel portion 121 is a conical structure, and the outer side wall of the multi-stage filling seal 2 matches the conical structure.

[0047] The transition piece 122 comprises engineering plastic, nylon or composite material, and the first main body 11 and the channel portion 121 comprise reinforced concrete, engineering plastic, nylon or composite material. Generally, the first main body 11 and the channel portion 121 are integrally formed. When the first main body 11 and the channel portion 121 are made of reinforced concrete, the transition piece 122 is inserted into the mold when the first main body 11 and the channel portion 121 are cast and formed, so as to obtain the first main body 11, the channel portion 121 and the transition piece 122 that are tightly connected. When the first main body 11, the channel portion 121 and the transition piece 122 are made of the same material, the three are integrally formed.

[0048] like Figure 3 As shown, in actual use, multiple cables 8 are usually fixed by multiple waterproof fixing joints, and each waterproof fixing joint cooperates with each other and is tightly connected to achieve modular stacking. The outer side walls of the first body 11 and the second body 12 are provided with a plurality of dovetail grooves 6 (see Figure 1 and Figure 2 ), a special connection block matching the dovetail groove 6 is inserted into the dovetail groove 6 of the two waterproof joint bodies 1 to connect two adjacent waterproof joint bodies 1, thereby achieving fixed locking between different waterproof joint bodies 1. In this embodiment, the outer side walls of the first body 11 and the channel portion 121 are a quadrilateral structure, and a dovetail groove 6 is provided on each of the four outer side walls of the first body 11 and the second body 12.

[0049] Several circles of second sealing structures are provided on the outer side walls of the first body 11 and / or the second body 12, and several second sealing members 112 are respectively placed in the second sealing structures to cooperate therewith. The second sealing members 112 are placed in the second sealing structures, and can fill and seal the space between adjacent waterproof joint bodies 1 to ensure the sealing between adjacent waterproof joint bodies 1. In this embodiment, a circle of second sealing structures is provided on the first body 11, and the outer side walls of the first body 11 and the channel portion 121 are of a cubic structure, so the second sealing member 112 is also of a square structure. In addition, the second sealing structure is a sealing groove, and the second sealing member 112 is a sealing ring containing a water-swellable material, and its sealing performance is better when soaked in groundwater. Preferably, the second sealing member 112 is a rubber-based sealing ring.

[0050] The multi-stage filling seal 2 is composed of a plurality of filling seals of different radii, which are arranged in the second section through hole, and the inner wall diameter of the multi-stage filling seal 2 matches the outer diameter of the cable 8, and the outer wall diameter matches the diameter of the second section through hole. The multi-stage filling seal 2 contains water-swellable material, and its sealing performance is better when soaked in groundwater. Preferably, it is a rubber-based sealing ring.

[0051] In this embodiment, the multi-stage filling seal 2 comprises a first-stage filling seal 22 and a second-stage filling seal 21, wherein the second-stage filling seal 21 is sleeved on the first-stage filling seal 22, the inner wall diameter of the first-stage filling seal 22 matches the outer diameter of the cable 8, and the outer wall diameter of the second-stage filling seal 21 matches the diameter of the second section through hole. In addition, both the first-stage filling seal 22 and the second-stage filling seal 21 are composed of two semicircular half blocks. The structure of the multi-stage filling seal 2 can be adjusted according to the different sizes of the cable 8.

[0052] The sealing ring 4 is arranged in the locking cap 3 and connected to the locking cap 3. The sealing ring 4 is located outside the multi-stage filling seal 2. In this embodiment, the sealing ring 4 is composed of two semicircular half blocks (see Figure 1 The components 41 and 42 in the embodiment of the present invention can be fixed by positioning pins, which can achieve good positioning.) The sealing ring 4 is made of engineering plastics or ceramic-based materials.

[0053] Among them, the inner wall diameter of the first port of the locking cap 3 away from the second body 12 is smaller than the inner wall diameter of the second port on the other side, the diameter of the sealing ring 4 is larger than the inner wall diameter of the first port, and the sealing ring 4 is arranged between the first port and the waterproof joint body 1. During use, the waterproof joint body 1 and the first port of the locking cap 3 clamp the sealing ring 4, so that the sealing ring 4 is in contact and connected with the locking cap 3, and it is outside the filling seal, so it can prevent the filling seal from sliding out. In addition, a sealing ring 4 with a threaded structure on the outer wall can be used as needed, and the sealing ring 4 is threadedly connected with the locking cap 3. Preferably, the inner diameter at the first port of the locking cap 3 is the same as the inner diameter of the cable drain pipe 7.

[0054] In addition, the present invention also includes a cable dragging protection ring 5, and the locking cap 3 is provided with a plurality of auxiliary locking holes with a threaded structure, and the cable dragging protection ring 5 is provided with a plurality of corresponding through holes, and a plurality of bolts pass through the through holes and are screwed into the auxiliary locking holes to fix the cable dragging protection ring 5 on the locking cap 3. The inner side of the cable dragging protection ring 5 is a bearing structure, which has good mobility and will not get stuck. It can effectively reduce the friction coefficient when laying the cable 8, and avoid the damage to the cable duct 7 and the waterproof connector body 1 caused by the dragging of the cable 8 during the laying process. The inner diameter of the cable dragging protection ring 5 is the same as the inner diameter of the cable duct 7. The cable dragging protection ring 5 can be made of cemented carbide material or ceramic-based material, and has good wear resistance.

[0055] During use, the prefabricated waterproof fixed joints for the cable working well are combined with the reserved square holes on both sides of the cable working well, and they can be cast on site without being made, that is, a prefabricated module combination. When in use, different numbers of prefabricated waterproof fixed joints for the cable working well can be placed according to the reserved size of the cable working well, and can be flexibly combined. The prefabricated waterproof fixed joint for the cable working well can effectively connect the cable drain pipe 7 and the cable working well, fill the gap between the cable 8 and the working well, and effectively prevent groundwater from entering the cable working well.

[0056] When working, you can first clean the reserved square holes on both sides of the cable working well, remove the silt and debris on both sides of the reserved square holes, and ensure that there is no large amount of water in the cable working well. Apply the special sealing material for waterproof joints around the reserved square holes of the cable working well, and ensure that the thickness of the special sealing material for waterproof joints is between 3cm-5cm (try to ensure that the thickness is uniform), so as to ensure the sealing performance of the prefabricated waterproof fixed joints used in the cable working well.

[0057] Next, the cable 8 can be fixedly installed using the prefabricated waterproof fixing joint for the cable working well of the present invention according to the following method, which comprises the following steps:

[0058] S1. Install several assembled cable working wells to the predetermined positions of the cable working wells with prefabricated waterproof fixed joints, ensure that the cable drainage tube 7 is inserted into the waterproof joint body 1, insert the special connecting block into the dovetail groove 6 of the adjacent waterproof joint body 1, lock and connect the adjacent waterproof joint bodies 1, and keep the surface of the waterproof joint body 1 neat and beautiful.

[0059] Check the connection between the waterproof joint body 1 and the cable working well, fill all gaps with special sealing material for waterproof joints, and fill the gaps between the waterproof joint bodies 1, and leave it for 24 hours.

[0060] S2. When laying the cable 8, unscrew the locking cap 3 and take out the multi-stage filling seal 2 and the sealing retaining ring 4.

[0061] S3, locking the locking cap 3 and the waterproof connector body 1.

[0062] S4. Drag the cable traction rope, pass the cable 8 through the cable dragging protection ring 5, the locking cap 3 and the through hole of the waterproof connector body 1, and insert it into the cable drainage tube 7, and try to ensure that the cable 8 is located in the middle of the through hole.

[0063] S5. After the cable 8 is in place, unscrew the locking cap 3 and install the multi-stage filling seal 2 into the second section through hole. The filling seal with a small radius can be installed first and then the filling seal with a large radius.

[0064] S6. Connect the sealing ring 4 to the locking cap 3 (placed between the locking cap 3 and the second body 12).

[0065] S7. Tighten the locking cap 3 and the waterproof connector body 1. Preferably, the locking cap 3 is screwed so that it cannot be twisted. The multi-stage filling seal 2 is squeezed through the transition connector 122 to ensure that the multi-stage filling seal 2 has sufficient deformation, thereby sealing the inner hole gap between the cable 8 and the waterproof connector body 1.

[0066] In order to ensure waterproof performance, waterproof tape can be used to wrap two layers of the cable 8 and the surface of the locking cap 3. After installation, check the waterproof connector installation site to ensure that each waterproof connector body 1 and the locking cap 3 are firmly installed.

[0067] To sum up, a prefabricated waterproof fixed joint for a cable working well of the present invention combines a waterproof joint body, a multi-stage filling seal, a locking cap and a sealing retaining ring, which can effectively solve the sealing problem of cables, cable pipes and the wellhead of the cable working well, and eliminates the problem of leakage water flowing into the cable working well along the cable pipe, thereby effectively avoiding the problem of water accumulation and mutual flow between different cable working wells; in addition, the installation method of the prefabricated waterproof fixed joint for the cable working well of the present invention adopts modular installation, simplifies the construction process, and ensures better waterproof effect.

[0068] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A prefabricated waterproof fixed joint for a cable working well, characterized in that: The connector contains: A waterproof connector body (1), comprising a first body (11) and a second body (12) connected thereto, the waterproof connector body (1) being provided with through holes, the through holes comprising a first section of through holes of the first body (11) and a second section of through holes of the second body (12), the diameter of the first section of through holes matching the outer diameter of a cable tube (7), the diameter of the second section of through holes being smaller than the diameter of the first section of through holes, the cable tube (7) being inserted into the first section of through holes, the cable (8) passing through the second section of through holes and being inserted into the cable tube (7); A multi-stage filling seal (2), composed of a plurality of filling seals with different radii, which is arranged in the second section through hole, wherein the inner wall diameter of the multi-stage filling seal (2) matches the outer diameter of the cable (8), and the outer wall diameter matches the diameter of the second section through hole; A locking cap (3) connected to the second body (12) via threads; A sealing ring (4) is arranged in the locking cap (3) and connected to the locking cap (3); the sealing ring (4) is located outside the multi-stage filling seal (2).

2. The prefabricated waterproof fixed joint for a cable working well as claimed in claim 1, characterized in that: The second body (12) comprises: A channel portion (121) connected to the first body (11); The transition connector (122) is formed by extending outward from the channel portion (121), and a threaded structure is arranged on the outer side of the transition connector (122) and is threadedly connected to the locking cap (3).

3. The prefabricated waterproof fixed joint for a cable working well as claimed in claim 2, characterized in that: The inner side wall of the port of the transition connecting piece (122) away from the channel portion (121) is a conical structure, and the outer side wall of the multi-stage filling seal (2) matches the conical structure.

4. The prefabricated waterproof fixed joint for a cable working well as claimed in claim 1, characterized in that: The multi-stage filling seal (2) comprises a first-stage filling seal (22) and a second-stage filling seal (21), wherein the second-stage filling seal (21) is sleeved on the first-stage filling seal (22), the inner wall diameter of the first-stage filling seal (22) matches the outer diameter of the cable (8), and the outer wall diameter of the second-stage filling seal (21) matches the diameter of the second section through hole.

5. The prefabricated waterproof fixed joint for a cable working well as claimed in claim 1, characterized in that: The inner wall diameter of the first port of the locking cap (3) away from the second body (12) is smaller than the inner wall diameter of the second port on the other side, the diameter of the sealing ring (4) is larger than the inner wall diameter of the first port, and the sealing ring (4) is arranged between the first port and the waterproof joint body (1); And / or, the sealing ring (4) includes a threaded structure on its side wall, and the sealing ring (4) is threadedly connected to the locking cap (3).

6. The prefabricated waterproof fixed joint for a cable working well as claimed in claim 2, characterized in that: A plurality of circles of first sealing structures are provided on the inner side wall of the first body (11) and / or the second body (12), and a plurality of first sealing members (111) are respectively placed in the first sealing structures; And / or, a plurality of dovetail grooves (6) are provided on the outer side walls of the first body (11) and / or the second body (12), and a special connection block matching the dovetail grooves (6) is inserted into the dovetail grooves (6) of the two waterproof joint bodies (1) to connect the two waterproof joint bodies (1); And / or, a plurality of circles of second sealing structures are provided on the outer side walls of the first body (11) and / or the second body (12), and a plurality of second sealing members (112) are respectively placed in the second sealing structures.

7. The prefabricated waterproof fixed joint for a cable working well as claimed in claim 1, characterized in that: The multi-stage filling seal (2) and / or the sealing retaining ring (4) are composed of semicircular half blocks; And / or, the diameter of the second section of through hole is the same as the inner diameter of the cable drainage tube (7).

8. The prefabricated waterproof fixed joint for a cable working well as claimed in claim 6, characterized in that: The transition connector (122) comprises engineering plastics, nylon or a composite material, and the first main body (11) and the channel portion (121) comprise reinforced concrete, engineering plastics, nylon or a composite material; and / or, the multi-stage filling seal (2) and / or the first seal (111) and / or the second seal (112) comprise a material that swells in contact with water; And / or, the first body (11) and / or the outer side wall of the channel portion (121) is a cubic structure; And / or, the first main body (11) and / or the channel portion (121) and / or the transition connector (122) are integrally formed.

9. The prefabricated waterproof fixed joint for a cable working well according to any one of claims 1 to 8, characterized in that: Also includes: A cable dragging protection ring (5), wherein the locking cap (3) is provided with a plurality of auxiliary locking holes with a threaded structure, and the cable dragging protection ring (5) is provided with a plurality of corresponding through holes, and a plurality of bolts pass through the through holes and are screwed into the auxiliary locking holes to fix the cable dragging protection ring (5) on the locking cap (3), and the inner side of the cable dragging protection ring (5) is a bearing structure.

10. A method for installing a cable (8) using the prefabricated waterproof fixed joint for a cable working well as claimed in any one of claims 1 to 9, characterized in that: The prefabricated waterproof fixed joint for the cable working well further comprises a cable dragging protection ring (5), on which a plurality of corresponding through holes are provided; the locking cap (3) is provided with a plurality of auxiliary locking holes with threaded structures; the second body (12) of the prefabricated waterproof fixed joint for the cable working well comprises: a channel portion (121), connected to the first body (11); a transition connector (122), which is extended outward from the channel portion (121), and a threaded structure is provided on the outer side of the transition connector (122), which is threadedly connected to the locking cap (3); a plurality of dovetail grooves (6) are provided on the outer side wall of the first body (11) and / or the second body (12); The method comprises the following steps: S1. Install several assembled cable working wells to the predetermined positions of the cable working wells using prefabricated waterproof fixed joints, ensure that the cable drainage pipe (7) is inserted into the waterproof joint body (1), insert the dedicated connection block into the dovetail groove (6) of the adjacent waterproof joint body (1), and lock and connect the adjacent waterproof joint bodies (1); S2. When laying the cable (8), unscrew the locking cap (3) and take out the multi-stage filling seal (2) and the sealing retaining ring (4); S3, locking the locking cap (3) and the waterproof connector body (1); S4, drag the cable traction rope, pass the cable (8) through the cable drag protection ring (5), the locking cap (3) and the through hole of the waterproof connector body (1), and insert it into the cable drainage tube (7); S5. After the cable (8) is in place, unscrew the locking cap (3) and install the multi-stage filling seal (2) into the second section through hole; S6. Place the sealing ring (4) between the locking cap (3) and the second body (12); S7. Tighten the locking cap (3) and the waterproof connector body (1) and pass the transition connector (122). Extrude the multi-stage filling seal (2) to ensure that the multi-stage filling seal (2) has sufficient deformation. Thereby, the inner hole gap between the cable (8) and the waterproof joint body (1) is sealed.

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