Device and method for laying single-bundle power cable in pipeline

Abstract

The invention discloses a method for laying a single-bundle power cable in a pipeline, which comprises a laying pipeline, and is characterized in that the upper part of the pipeline is provided with a narrower opening A penetrating through the axial direction, and the pipeline also comprises a sealing strip with an I-shaped cross section; grooves in the two sides of the I-shaped sealing strip are matched with the pipeline edge at the opening of the laying pipeline, a detachable clamping ring capable of being pulled out in the axial direction is installed on the plane of the lower portion of the I-shaped sealing strip, a cable can be movably or fixedly clamped in the clamping ring, and the annular portion of the clamping ring can be arranged in an opening and closing mode. By adopting the device and the method, the efficiency can be improved, and the labor can be reduced.

Description

Technical Field

[0001] The invention relates to a power cable laying technology, in particular to a single-bundle power cable laying device in a pipeline. Background Art

[0002] A novel power cable installation device is disclosed in Chinese patent CN110571712B, and specifically discloses: comprising a clamping unit, the clamping unit comprising a lower walking part and an upper clamping part, the clamping part comprising an annular frame, the annular frame being formed by buckling an upper opening piece and a lower opening piece, one end of the upper opening piece and one end of the lower opening piece are hinged ends and are hinged by a hinge, the other end of the upper opening piece and the other end of the lower opening piece are open and closed ends and are connected by an elastic rope; the clamping units are multiple and arranged side by side, the hinged ends of two adjacent clamping units are connected to each other by a connecting piece, and the open and closed ends of the multiple clamping units are connected by the same elastic rope; the hinged end of the annular frame is higher than the open and closed end, and the two ends of the upper opening piece are connected with an elastic strip A, and the two ends of the lower opening piece are connected with an elastic strip B, the elastic strip A and the elastic strip B are close to each other when the annular frame is buckled, and the elastic strip A and the elastic strip B can wrap the cable through its elastic force to form a cable channel. The installation device in the above patent avoids direct connection between the cable and the annular frame, which not only avoids direct friction between the cable and the pipeline, but also avoids friction between the installation device and the cable surface. The cable will be gently ejected from the annular frame and lightly fall into the pipeline under the action of the rebound force of the elastic strip B, and then the operator will carefully pull the installation device out from the side wall of the pipeline.

[0003] However, there is still a problem in the above patent: in fact, in the actual use process, when the cable is dropped into the pipe in advance and the device is carefully pulled out, there will be friction and contact between the device and the cable. In addition, since the device in the above patent also has an open and closed end, the protruding part of the open and closed end may scratch the cable.

[0004] In addition, there is another problem in the above patent: if it is necessary to connect two adjacent clamping units while threading the pipe and install them on the cable, then the work efficiency will inevitably be reduced; if the clamping unit is installed on the cable in advance, then the rigid connection between the supporting units will inevitably cause it to occupy too much ground space. Summary of the invention

[0005] The purpose of the present invention is to provide a single-bundle power cable laying device in a pipeline with less manpower, high work efficiency and no damage to the cable. In order to achieve the above-mentioned purpose, the present invention is implemented as follows: a single-bundle power cable laying device in a pipeline, including a laying pipeline, characterized in that: the upper part of the pipeline has a narrow opening A that runs through the axial direction, and also includes a sealing strip with an I-shaped cross-section, the grooves on both sides of the I-shaped sealing strip match the edges of the pipeline at the opening of the laying pipeline, and the lower plane of the I-shaped sealing strip is equipped with a detachable clamping ring that can be pulled out axially, the cable can be movably or fixedly clamped in the clamping ring, and the annular part of the clamping ring can be opened and closed.

[0006] To further achieve sealing, the I-shaped sealing strip includes an upper transverse portion, a lower transverse portion, and an intermediate connecting portion connecting the upper transverse portion and the lower transverse portion. The width of the upper transverse portion is greater than the width of the lower transverse portion and the upper transverse portion is located outside the laid pipeline, the lower transverse portion is located inside the laid pipeline, and the upper transverse portion and the lower transverse portion are arranged to be an arc shape concentric with the laid pipeline.

[0007] In order to further achieve the laying operation by two people, reduce the workload and staffing, an embedded installation groove that penetrates the axial direction of the sealing strip is provided on the bottom surface of the lower transverse portion, a pull rope is provided in the installation groove, and the pull rope can be moved in the installation groove by external force, and the lower part of the installation groove has an opening B, and a blocking portion is provided at one end of the pull rope, and the cross-sectional area of ​​the blocking portion is larger than the cross-sectional area of ​​the installation groove, the pull rope is located in the installation groove, and the blocking portion of the pull rope is located outside the installation groove, a fixed clamping ring is provided at one end of the pull rope located at the blocking portion, and a plurality of movable clamping rings are provided on the pull rope, and the fixed clamping ring and the movable clamping ring both include a connecting portion and an annular portion, the connecting portion is connected to the pull rope, and the annular portion is located in the laying pipeline and clamps the cable.

[0008] Furthermore, a fixed hanging ring is provided on the pull rope at intervals, and a hook matching the hanging ring is provided at the connecting portion of the fixed clamping ring and the movable clamping ring. The annular portion A of the fixed clamping ring is elastic, and the inner diameter of the annular portion A is slightly smaller than the outer diameter of the cable to be laid, and the annular portion B of the movable clamping ring is made of hard plastic, and the inner diameter of the annular portion B is larger than the outer diameter of the cable to be laid.

[0009] Furthermore, the annular portion B is composed of two semicircular semi-circular rings, wherein one end of one semi-circular ring A is hinged to the tail of the connecting portion, and one end of the other semi-circular ring B is hinged to the other end of the semi-circular ring A, and a mounting hole is provided at the other end of the semi-circular ring B, and a mounting column matching the mounting hole is provided at the end of the semi-circular ring A hinged to the connecting portion, and a limiting convex ring is provided on the mounting column.

[0010] In order to further protect the cable, the inner circles of the annular portion A and the annular portion B are both provided with a plush layer 19 .

[0011] In order to further achieve the sealing of the pipeline and prevent the cable from being corroded, the I-shaped sealing strip is made of PVC material, and sealing rubber strips that fit the laid pipeline are arranged on the inner sides of the grooves on both sides of the I-shaped sealing strip.

[0012] To further facilitate construction, a pull ring is provided on the upper transverse portion of one end of the I-shaped sealing strip where the blocking portion is provided.

[0013] The present invention also provides a method for laying a single bundle of power cables in a pipeline, which adopts the above-mentioned device for laying power cables in a pipeline and is carried out according to the following steps: Step 1: Pre-lay pipelines at the construction site where power cables need to be laid; Step 2: A cable drum is arranged at one end of the laying pipeline, the cable is wound on the cable drum, and an I-shaped sealing strip is also included. A draw rope is pre-installed in the sealing strip, and a hanging ring is pre-installed on the draw rope; Step 3: The first staff member pulls out the cable, and sets the annular portion of the fixed clamping ring on the head of the cable, and at the same time hangs the hook on the connecting portion of the fixed clamping ring on the first hanging ring located at the blocking portion of the pull rope; the second staff member holds the pull ring at the end of the I-shaped sealing strip and inserts the left and right grooves of the I-shaped sealing strip into the opening on the laying pipeline, and at the same time pulls the I-shaped sealing strip forward through the pull ring to ensure that the cable passes into the laying pipeline; Step 4: The first worker continues to sleeve the annular portion of the movable clamping ring on the cable, and hangs the hook of the connecting portion of each movable clamping ring on the hanging ring of the pull rope in axial order in a front-to-back order. The second worker pulls the pull ring of the I-shaped sealing strip forward according to the progress of the first worker to realize the cable threading, until the cable is completely inserted into the laying pipeline; Step 5: After the pipe threading is completed, the first worker stops working, and the second worker reaches the other end of the laying pipeline and removes the fixed clamping ring from the cable; then pulls the plug of the pull rope and slowly pulls the pull rope out of the installation groove. During the process of pulling the pull rope out, the annular part of the movable clamping ring slides forward on the cable and gradually detaches from the cable, and the cable gradually and slowly falls into the inner cavity of the laying pipeline from back to front, completing the pipe threading of the cable and the sealing of the laying pipeline.

[0014] Beneficial effects: The device and method for laying a single-bundle power cable in a pipeline of the present invention are adopted: first, a laying pipeline with an axial opening on the upper part can be pre-placed, and then the cable can be threaded through the pipeline while the laying pipeline is sealed. Second, during the laying process of the laying device of the present invention, the cable will not contact the inner wall of the pipeline, ensuring that the cable will not be scratched by the pipeline. At the same time, in the process of pulling out the pull rope, the pipeline gradually and slowly falls into the inner wall of the pipeline from back to front, which greatly ensures the integrity of the cable, avoids cable damage caused by external force or friction, achieves the purpose of safe laying, and the success rate of threading is very high. Third, during the use of the device of the present invention, there is no need to pull out the cable for a long distance in advance, but to pull it out slowly. After pulling it out, the clamping ring is installed on the cable, and then the clamping ring is hung on the sealing strip. This approach avoids the cable being pulled out for a long distance in advance and causes friction and damage, and saves space. Fourth, during the use of the device of the present invention, only two workers are required to complete it, with high efficiency and low labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Axonometric view of laying pipelines in the embodiment; Figure 2 It is an axonometric view of the I-shaped sealing strip in the embodiment; Figure 3 It is a cross-sectional view of the pipeline being laid during the laying process; Figure 4 This is a cross-sectional view of the pipeline after it is laid; Figure 5 This is an axial cross-section of an I-shaped sealing strip (including the clamping ring). DETAILED DESCRIPTION

[0016] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings, but the present invention is not limited to these implementation modes, and any improvement or substitution based on the basic spirit of the present embodiment still falls within the scope of protection required by the claims of the present invention.

[0017] Example: Figure 1-5 As shown, this embodiment provides a single-bundle power cable laying device in a pipeline, comprising a laying pipeline 1, wherein the upper portion of the pipeline has a relatively narrow opening A2 that runs through the axial direction. The power cable laying device also includes a sealing strip 3 with an I-shaped cross section, and the grooves 4 on both sides of the I-shaped sealing strip match the pipeline edge at the opening of the laying pipeline.

[0018] The I-shaped sealing strip includes an upper transverse portion 5, a lower transverse portion 6, and an intermediate connecting portion 7 connecting the upper transverse portion and the lower transverse portion, wherein the width of the upper transverse portion is greater than that of the lower transverse portion and the upper transverse portion is located outside the laying pipeline, and the lower transverse portion is located inside the laying pipeline. The upper transverse portion and the lower transverse portion are arranged in an arc shape concentric with the laying pipeline.

[0019] In this embodiment, an embedded installation groove 8 that penetrates the axial direction of the sealing strip is provided on the bottom surface of the lower transverse portion, and a pull rope 9 is provided in the installation groove. The pull rope can be moved in the installation groove by external force. The lower part of the installation groove has an opening B10, and a blocking portion 11 is provided at one end of the pull rope. The cross-sectional area of ​​the blocking portion is larger than the cross-sectional area of ​​the installation groove. In this embodiment, the blocking portion is formed by knotting the first pull rope. The pull rope is located in the installation groove, and the blocking portion of the pull rope is located outside the installation groove. A fixed clamping ring 12 is provided at one end of the pull rope located at the blocking portion, and a plurality of movable clamping rings 13 are provided on the pull rope. The fixed clamping ring and the movable clamping ring both include a connecting portion 14 and an annular portion. The connecting portion is connected to the pull rope, and the annular portion is located in the laying pipeline.

[0020] As one embodiment, a fixed hanging ring 15 is provided on the pull rope at intervals, and a hook 16 matching with the hanging ring is provided at the connection part between the fixed clamping ring and the movable clamping ring. The fixed clamping ring and the movable clamping ring are connected to the pull rope in a detachable manner through the cooperation between the hook and the hanging ring.

[0021] The annular portion A17 of the fixed clamping ring is different from the annular portion B18 of the movable clamping ring. The annular portion A of the fixed clamping ring is made of an elastic material, such as elastic rubber. The inner diameter of the annular portion A is slightly smaller than the outer diameter of the cable to be laid. In this way, when the annular portion A holds the cable tightly, it is equivalent to achieving a fixed connection with the cable and will not move relative to the cable.

[0022] The annular portion B18 of the movable clamping ring is made of hard plastic, and the inner diameter of the annular portion B is larger than the outer diameter of the cable to be laid. In this way, when the pull rope and the cable move relative to each other, the annular portion B will also move with the pull rope and then move relative to the cable.

[0023] In this embodiment, the annular portion B is composed of two semicircular semicircular rings, wherein one end of one semicircular ring A is hinged to the tail of the connecting portion, and one end of the other semicircular ring B is hinged to the other end of the semicircular ring A, and a mounting hole is provided at the other end of the semicircular ring B, and a mounting column matching the mounting hole is provided at the end of the semicircular ring A hinged to the connecting portion, and a limiting convex ring is provided on the mounting column, and the mounting hole can be forcefully inserted into the mounting column inside the limiting convex ring to achieve limiting.

[0024] Of course, other limiting methods may also be adopted. For example, a slot is provided on the connecting portion, and a row of ratchet teeth A extending inward is provided on the bottom surface of the slot. The other end of the semicircular ring B is provided with a row of ratchet teeth B extending outward and cooperating with the ratchet teeth. The ratchet teeth A and the ratchet teeth B are engaged with each other by inserting the semicircular ring B into the slot.

[0025] In addition, the inner circles of the annular portion A and the annular portion B are both provided with a plush layer 19, the purpose of which is to prevent the annular portion A and the annular portion B from damaging the outer surface of the cable during the laying process.

[0026] As another implementation in this embodiment, the I-shaped sealing strip is made of PVC material, but embedded sealing rubber strips 20 are arranged on the inner side of the grooves on both sides of the I-shaped sealing strip, that is, below the upper transverse part, above the lower transverse part, and on both sides of the middle connecting part. The sealing rubber strip runs through the axial direction of the I-shaped sealing strip. In this embodiment, the sealing rubber strip is a U-shape placed horizontally to the left and right. Moreover, a pull ring is arranged on the upper transverse part of one end of the I-shaped sealing strip where the stretch plugging part is arranged. The pull ring is arranged to be fixedly connected or detachably connected to the upper transverse part of the I-shaped sealing strip. For example, a U-shaped sleeve opening toward the rear is arranged on the upper transverse part, and the pull ring can be sleeved on the U-shaped sleeve and pull the I-shaped sealing strip to move forward.

[0027] This embodiment also provides a method for laying a power cable in a pipeline, using the power cable laying device in this embodiment and following the steps below: Step 1: Pre-lay pipelines at the construction site where power cables need to be laid; Step 2: A cable drum is arranged at one end of the laying pipeline, the cable is wound on the cable drum, and an I-shaped sealing strip is also included. A draw rope is pre-installed in the sealing strip, and a hanging ring is pre-installed on the draw rope; Step 3: The first staff member pulls out the cable 21, and sets the annular portion of the fixed clamping ring on the head of the cable, and at the same time hangs the hook on the connecting portion of the fixed clamping ring on the first hanging ring located at the blocking portion of the pull rope; the second staff member holds the pull ring at the end of the I-shaped sealing strip and inserts the left and right grooves of the I-shaped sealing strip into the opening on the laying pipeline, and at the same time pulls the I-shaped sealing strip forward through the pull ring to ensure that the cable passes into the laying pipeline; Step 4: The first worker continues to sleeve the annular portion of the movable clamping ring on the cable, and hangs the hook of the connecting portion of each movable clamping ring on the hanging ring of the pull rope in axial order in a front-to-back order. The second worker pulls the pull ring of the I-shaped sealing strip forward according to the progress of the first worker to realize the cable threading, until the cable is completely inserted into the laying pipeline; Step 5: After the pipe threading is completed, the first worker stops working, and the second worker reaches the other end of the laying pipeline and removes the fixed clamping ring from the cable; then pulls the plug of the pull rope and slowly pulls the pull rope out of the installation groove. During the process of pulling the pull rope out, the annular part of the movable clamping ring slides forward on the cable and gradually detaches from the cable, and the cable gradually and slowly falls into the inner cavity of the laying pipeline from back to front, completing the pipe threading of the cable and the sealing of the laying pipeline.

[0028] The device and method for laying power cables in the pipeline of the present embodiment are adopted: first, a laying pipeline with an axial opening on the upper part can be pre-placed, and then the cable can be threaded through the pipeline while the laying pipeline is sealed. Second, during the laying process of the laying device in the present embodiment, the cable will not contact the inner wall of the pipeline, ensuring that the cable will not be scratched by the pipeline. At the same time, during the process of pulling out the pull rope, the pipeline gradually and slowly falls into the inner wall of the pipeline from back to front, which greatly ensures the integrity of the cable, avoids cable damage caused by external force or friction, achieves the purpose of safe laying, and the success rate of threading is very high. Third, during the use of the device in the present embodiment, there is no need to pull out the cable for a long distance in advance, but to pull it out slowly, and then install the clamping ring on the cable after pulling it out, and then hang the clamping ring on the sealing strip. This practice avoids the cable being pulled out for a long distance in advance and causing friction and damage to the cable. Fourth, during the use of the device in the present embodiment, only two workers are required to complete it, with high efficiency and low labor.

Claims

1. A single-bundle power cable laying device in a pipeline, comprising a laying pipeline, characterized in that: The upper part of the laying pipeline has a narrow opening A that runs axially through it, and also includes a sealing strip with an I-shaped cross-section. The grooves on both sides of the I-shaped sealing strip match the edges of the pipeline at the opening of the laying pipeline, and the lower plane of the I-shaped sealing strip is equipped with a detachable clamping ring that can be pulled out axially, and the cable can be movably or fixedly clamped in the clamping ring, and the annular part of the clamping ring can be opened and closed.

2. The single-bundle power cable laying device in a pipeline according to claim 1, characterized in that: The I-shaped sealing strip includes an upper transverse portion, a lower transverse portion, and an intermediate connecting portion connecting the upper transverse portion and the lower transverse portion, the width of the upper transverse portion is greater than the width of the lower transverse portion and the upper transverse portion is located outside the laying pipeline, the lower transverse portion is located inside the laying pipeline, and the upper transverse portion and the lower transverse portion are arranged to be concentric with the laying pipeline.

3. The single-bundle power cable laying device in a pipeline according to claim 2, characterized in that: An embedded installation groove that penetrates the axial direction of the sealing strip is provided on the bottom surface of the lower transverse portion, a pull rope is provided in the installation groove, the pull rope can be moved in the installation groove by external force, the lower part of the installation groove has an opening B, one end of the pull rope is provided with a blocking portion, the cross-sectional area of ​​the blocking portion is larger than the cross-sectional area of ​​the installation groove, the pull rope is located in the installation groove, and the blocking portion of the pull rope is located outside the installation groove, a fixed clamping ring is provided at one end of the pull rope located at the blocking portion, and a plurality of movable clamping rings are provided on the pull rope, the fixed clamping ring and the movable clamping ring both include a connecting portion and an annular portion, the connecting portion is connected to the pull rope, and the annular portion is located in the laying pipeline and clamps the cable.

4. The single-bundle power cable laying device in a pipeline as claimed in claim 3, characterized in that: A fixed hanging ring is arranged on the pull rope at regular intervals, and a hook matching with the hanging ring is arranged at the connecting portion between the fixed clamping ring and the movable clamping ring. The annular portion A of the fixed clamping ring is elastic, and the inner diameter of the annular portion A is slightly smaller than the outer diameter of the cable to be laid, and the annular portion B of the movable clamping ring is made of hard plastic, and the inner diameter of the annular portion B is larger than the outer diameter of the cable to be laid.

5. The single-bundle power cable laying device in a pipeline as claimed in claim 4, characterized in that: The annular portion B is composed of two semicircular semicircular rings, wherein one end of one semicircular ring A is hinged to the tail of the connecting portion, and one end of the other semicircular ring B is hinged to the other end of the semicircular ring A, and a mounting hole is provided at the other end of the semicircular ring B, and a mounting column matching the mounting hole is provided at the end of the semicircular ring A hinged to the connecting portion, and a limiting convex ring is provided on the mounting column.

6. The single-bundle power cable laying device in a pipeline as claimed in claim 5, characterized in that: The inner circles of the annular portion A and the annular portion B are both provided with a plush layer 19 .

7. The single-bundle power cable laying device in a pipeline according to claim 6, characterized in that: The I-shaped sealing strip is made of PVC material, and sealing rubber strips that fit the laid pipes are arranged inside the grooves on both sides of the I-shaped sealing strip.

8. The single-bundle power cable laying device in a pipeline according to claim 7, characterized in that: A pull ring is arranged on the upper transverse portion of one end of the I-shaped sealing strip where the blocking portion is arranged.

9. A method for laying a single bundle of power cables in a pipeline, using the apparatus for laying power cables in a pipeline as claimed in claim 8, and following the steps: Step 1: Pre-lay pipelines at the construction site where power cables need to be laid; Step 2: A cable drum is arranged at one end of the laying pipeline, the cable is wound on the cable drum, and an I-shaped sealing strip is also included. A draw rope is pre-installed in the sealing strip, and a hanging ring is pre-installed on the draw rope; Step 3: The first staff member pulls out the cable, and sets the annular portion of the fixed clamping ring on the head of the cable, and at the same time hangs the hook on the connecting portion of the fixed clamping ring on the first hanging ring located at the blocking portion of the pull rope; the second staff member holds the pull ring at the end of the I-shaped sealing strip and inserts the left and right grooves of the I-shaped sealing strip into the opening on the laying pipeline, and at the same time pulls the I-shaped sealing strip forward through the pull ring to ensure that the cable passes into the laying pipeline; Step 4: The first worker continues to sleeve the annular portion of the movable clamping ring on the cable, and hangs the hook of the connecting portion of each movable clamping ring on the hanging ring of the pull rope in axial order in a front-to-back order. The second worker pulls the pull ring of the I-shaped sealing strip forward according to the progress of the first worker to realize the cable threading, until the cable is completely inserted into the laying pipeline; Step 5: After the pipe threading is completed, the first worker stops working, and the second worker reaches the other end of the laying pipeline and removes the fixed clamping ring from the cable; then pulls the plug of the pull rope and slowly pulls the pull rope out of the installation groove. During the process of pulling the pull rope out, the annular part of the movable clamping ring slides forward on the cable and gradually detaches from the cable, and the cable gradually and slowly falls into the inner cavity of the laying pipeline from back to front, completing the pipe threading of the cable and the sealing of the laying pipeline.

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