Device and method for laying multiple bundles of power cables in pipeline

Abstract

The invention discloses a device and method for laying multiple bundles of power cables in a pipeline, and the device comprises a laying pipeline, the upper part of the laying pipeline is provided with a narrow opening A penetrating through the axial direction, the device also comprises a sealing strip with an I-shaped cross section, and the grooves at the two sides of the I-shaped sealing strip are matched with the pipeline edge at the opening of the laying pipeline. An embedded mounting groove penetrating through the axial direction of the sealing strip is formed in the bottom surface of the lower part of the I-shaped sealing strip, an opening B is formed in the lower part of the mounting groove, a first pull rope is arranged in the mounting groove, a connecting plate which extends downwards and is positioned in the laying pipeline is arranged at the lower part of the first pull rope, a C-shaped groove is formed in the connecting plate, and a second pull rope is arranged in the C-shaped groove. The lower portion of the C-shaped groove extends to an edge opening of the connecting plate, a second pull rope is arranged in the C-shaped groove, an elastic clamping ring is arranged on the lower portion of the connecting plate, one end of the elastic clamping ring is fixed to the connecting plate, and a penetrating hole is formed in the other end of the elastic clamping ring.

Description

Technical Field

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

[0002] A cable threading tube is disclosed in Chinese patent CN106207892B, and specifically disclosed as follows: the disclosed cable threading tube includes a tube body, a first elastic sealing plate and a second elastic sealing plate. The tube body is the main body of the cable threading tube, and the tube wall of the tube body is provided with a wire-passing notch. The tube body has a tube cavity, and the tube cavity is used to accommodate the cable, and the tube cavity is connected to the wire-passing notch. The wire-passing notch is used for allowing the cable to pass through, so that the cable can pass into the tube cavity from the outside of the tube body. In this embodiment, the wire-passing notch extends along the length direction of the tube body, and specifically, the extension direction of the wire-passing notch is parallel to the axis of the tube body. The first elastic sealing plate is fixed to one side edge of the wire-passing notch, and the second elastic sealing plate is fixed to the other side edge of the wire-passing notch. The first elastic sealing plate and the second elastic sealing plate both extend along the wire-passing notch. The first elastic sealing plate and the second elastic sealing plate are usually made of flexible materials, and specifically, both can be made of rubber material. The free ends of the first elastic sealing plate and the second elastic sealing plate fit together to seal the wire-passing notch. Under the action of external force, the free ends of the first elastic sealing plate and the second elastic sealing plate that are in contact with each other are deformed, thereby opening the wire notch.

[0003] When the structure in the above patent is in use, the cable is squeezed into the wire-passing notch by pressing. The width of the wire-passing notch is smaller than the diameter of the cable. The operator squeezes the cable through the wire-passing notch to prevent the cable from falling off from the official cavity of the tube body.

[0004] However, when using the above patented technology, firstly, the cable and its first elastic sealing plate and the second elastic sealing plate will inevitably rub against each other fully and move relative to each other through extrusion. Such friction can easily cause damage to the cable. Secondly, the above patented technology only seals by fitting the first elastic sealing plate and the second elastic sealing plate together, and the sealing effect is poor. During long-term use, the cable is prone to corrosion. Thirdly, during use, the above patented technology requires the cable to be completely pulled out to the same length as the tube body, and then squeezed in. In this way, the cable is prone to friction with other objects during the process of pulling out the cable, causing damage, and multiple operators are required to work together. Summary of the invention

[0005] The object of the present invention is to provide a device for laying multiple bundles of power cables in a pipeline which does not cause damage to the cables and has a good sealing effect. In order to achieve the above-mentioned purpose, the present invention is implemented as follows: A device for laying multiple bundles of power cables in a pipeline, comprising 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, the bottom surface of the lower part of the I-shaped sealing strip is provided with an embedded installation groove that runs through the axial direction of the sealing strip, the lower part of the installation groove has an opening B, a first pull rope is provided in the installation groove, the first pull rope can be moved in the installation groove by external force, a connecting plate extending downward and located in the laying pipeline is provided at the lower part of the first pull rope, a C-shaped groove is provided on the connecting plate, the lower part of the C-shaped groove extends to the edge opening of the connecting plate, a second pull rope is provided in the C-shaped groove, and an elastic clamping ring is provided at the lower part of the connecting plate, one end of the elastic clamping ring is fixed to the connecting plate, and the other end is provided with a through hole, the second pull rope passes through the through hole and is located in the C-shaped groove.

[0006] Preferably, there are multiple connecting plates arranged on the first pull rope along the axial direction, and each connecting plate is matched with an elastic clamping ring.

[0007] In order to further achieve a good sealing effect, 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 an arc shape concentric with the laying pipeline, and the mounting groove is arranged on the bottom surface of the lower transverse portion.

[0008] Furthermore, a blocking portion is provided at one end of the first pull rope, 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.

[0009] Preferably, the elastic clamping ring is a double-strand elastic rope, which passes through the through hole on the connecting plate and is closed. The two strands of the double-strand elastic rope are both tied to the outer wall of the cable and the other end forms the through hole composed of two strands of rope. The second pull rope passes through the through hole and goes around from the bottom opening of the C-shaped groove to the other end of the C-shaped groove.

[0010] Preferably, the I-shaped sealing strip is made of PVC material, and sealing rubber strips that fit the laid pipes are provided on the inner sides of the grooves on both sides of the I-shaped sealing strip.

[0011] To further facilitate operation, 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.

[0012] The present invention also provides a method for laying multiple bundles of power cables in a pipeline, which uses the above-mentioned power cable laying device 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 plurality of cable drums are arranged at one end of the laying pipeline, and a plurality of cables are wound on the cable drums. The cable drums also include an I-shaped sealing strip, in which a first draw rope is pre-installed, and the connecting plate is pre-installed on the first draw rope. The through holes on each connecting plate are pre-set with the elastic clamping ring, and then one end of the second draw rope is tied to the blocking part of the first draw rope. Step 3: The first staff member pulls out multiple bundles of cables, ties the heads of the multiple bundles of cables to an elastic clamping ring closest to the blocking part, then passes the second pull rope through the perforation on the elastic clamping ring, enters from the bottom opening of the C-shaped groove on the connecting plate, and wraps around the other end of the C-shaped groove to clamp it; the second staff member holds the pull ring at the end of the I-shaped sealing strip and clamps 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 penetrates into the laying pipeline; Step 4: The first worker continues to tie multiple bundles of cables to the elastic clamping ring, and inserts the second pull rope through the perforation of each elastic clamping ring into the C-shaped groove. The second worker pulls the pull ring of the I-shaped sealing strip forward according to the progress of the first worker to complete the cable insertion until the cable is completely inserted into the laying pipeline; Step 5: After the pipe threading is completed, the first staff member stops working, and the second staff member reaches the other end of the laying pipeline, unties the head of the second pull rope from the blocking part of the first pull rope, and then slowly pulls out the second pull rope; in the process of pulling out the second pull rope, the second pull rope releases the elastic clamping ring, and the elastic clamping ring releases multiple bundles of cables under the action of the rebound force. After the multiple bundles of cables lose the clamping of the elastic clamping ring, they fall into the laying pipeline; after the second pull rope is pulled out, all the cables fall completely into the laying pipeline, and finally the second staff member pulls the first pull rope out of the installation groove to complete the pipe threading of the cable and the sealing of the laying pipeline.

[0013] Beneficial effects: The device and method for laying multiple bundles of power cables in a pipeline of the present invention are adopted: first, a laying pipeline with an axial opening on the upper part can be placed in advance, 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, during the process of pulling out the second 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 multiple bundles of cables for a long distance in advance, but to pull them out slowly. After pulling them out, an elastic clamping ring is used to bind the multiple bundles of cables and then the second pull rope is used to tighten them, so that the cables can move with the movement of the I-shaped sealing strip. This approach avoids the friction and damage of the cables caused by pulling out the cables for a long distance in advance, 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. Fifth, after the I-shaped sealing strip is installed in place in the present invention, the multiple cables can be untied by pulling out the second pull rope, so that they can be installed in the laying pipeline. After the second pull rope is pulled out, the elastic clamping ring on the connecting plate returns to its original position under the action of its own elastic force, which will not affect the laying of the cables. And because the clamping ring is made of elastic material, even if the elastic clamping ring is tied or in contact with the cable during the installation process and the process of pulling out the first pull rope, it will not damage the surface of the cable, and has a protective effect on the cable. Sixth, the first pull rope, the second pull rope, the clamping ring, etc. of the present invention can be reused, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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 laid pipeline after it is laid. DETAILED DESCRIPTION

[0015] 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.

[0016] Example: Figure 1-4As shown, this embodiment provides a device for laying multiple bundles of power cables in a pipeline, comprising a laying pipeline 1, wherein the upper portion of the laying 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.

[0017] 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.

[0018] In this embodiment, an embedded installation groove 8 that runs through the axial direction of the I-shaped sealing strip is provided on the bottom surface of the lower transverse portion, and a first pull rope 9 is provided in the installation groove, and the pull rope can be moved in the installation groove by external force. The lower part of the installation groove has an opening 10, and one end of the pull rope is provided with a blocking portion, and 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 first pull rope is located in the installation groove, and the blocking portion of the first pull rope is located outside the installation groove. The lower part of the first pull rope is provided with a connecting plate 12 that extends downward and is located in the laying pipeline. The connecting plate can be pre-fixed and hung on the first pull rope, and the connecting plate is a triangle that widens downward.

[0019] In this embodiment, a through hole 13 is provided on one side of the bottom of the connection plate, and a C-shaped groove 14 is provided on the other side. The lower part of the C-shaped groove extends to the edge of the connection plate and is open. An elastic clamping ring 15 is provided in the through hole. One end of the elastic clamping ring passes through the through hole for fixing, and the other end is provided with a through hole 16. In this way, the elastic clamping ring can be used to wrap around the outer wall of the cable for binding, and then a second pull rope 17 can be used to pass through the through hole of the elastic clamping ring and then be inserted into the C-shaped groove from the opening of the C-shaped groove for fixing.

[0020] In this embodiment, there are multiple connecting plates arranged on the first pull rope along the axial direction, and each connecting plate is matched with an elastic clamping ring.

[0021] Specifically, the elastic clamping ring is an elastic rubber ring, which is closed after passing through the through hole. The second pull rope can pass through the elastic rubber ring and enter through the opening of the C-shaped groove and go around the other end of the C-shaped groove to be clamped. When the device of this embodiment is used to lay cables, the staff holds the cable with one hand so that it is located below the connecting plate, and pulls the elastic clamping ring with the other hand to bypass the cable from below, and then uses the second pull rope to pass through the elastic clamping ring and then clamp it into the C-shaped groove. In this way, the cable can be tied and moved with the movement of the I-shaped sealing strip.

[0022] As another implementation scheme of this embodiment, the elastic clamping ring adopts a structure with circles on both sides and a connecting strip in the middle, wherein the circle at one end is sleeved on the through hole, and the circle at the other end is used as a through hole through which the second pull rope passes. However, the first type is still adopted in this embodiment, that is, a complete circular rubber ring, which is double-stranded when binding, and the second pull rope directly passes through the circular ring when perforating the hole. The advantages of doing so are: first, the use of double-strand binding can make the cable more reliable and stable, and can disperse the pressure on the cable during binding to avoid damage to the cable. Second, this method is more flexible, with less restrictions when the second pull rope is passed through the through hole, and is more convenient for staff to operate.

[0023] As another implementation in this embodiment, a plush layer 18 is provided on the bottom surface of the connecting plate, and the purpose of this is to avoid damage to the outer surface of the cable during the laying process.

[0024] As another implementation in this embodiment, the I-shaped sealing strip is made of PVC material, but embedded sealing rubber strips 19 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.

[0025] This embodiment also provides a method for laying multiple bundles of power cables in a pipeline, using the power cable laying device in the pipeline of 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 plurality of cable drums are arranged at one end of the laying pipeline, and a plurality of cables 20 are wound on the cable drums. The cable drums also include an I-shaped sealing strip, in which a first draw rope is pre-installed, and the connecting plate is pre-installed on the first draw rope. The through hole on each connecting plate is pre-set with the elastic clamping ring (elastic rubber ring), and then one end of the second draw rope is tied to the blocking part of the first draw rope. Step 3: The first staff member pulls out multiple bundles of cables, ties the heads of the multiple bundles of cables to an elastic clamping ring closest to the blocking part, then passes the second pull rope through the perforation on the elastic clamping ring, enters from the bottom opening of the C-shaped groove on the connecting plate, and wraps around the other end of the C-shaped groove to clamp it; the second staff member holds the pull ring at the end of the I-shaped sealing strip and clamps 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 penetrates into the laying pipeline; Step 4: The first worker continues to tie multiple bundles of cables to the elastic clamping ring, and inserts the second pull rope through the perforation of each elastic clamping ring into the C-shaped groove. The second worker pulls the pull ring of the I-shaped sealing strip forward according to the progress of the first worker to complete the cable insertion until the cable is completely inserted into the laying pipeline; Step 5: After the pipe threading is completed, the first staff member stops working, and the second staff member reaches the other end of the laying pipeline, unties the head of the second pull rope from the blocking part of the first pull rope, and then slowly pulls out the second pull rope; in the process of pulling out the second pull rope, the second pull rope releases the elastic clamping ring, and the elastic clamping ring releases multiple bundles of cables under the action of the rebound force. After the multiple bundles of cables lose the clamping of the elastic clamping ring, they fall into the laying pipeline; after the second pull rope is pulled out, all the cables fall completely into the laying pipeline, and finally the second staff member pulls the first pull rope out of the installation groove to complete the pipe threading of the cable and the sealing of the laying pipeline.

[0026] The device and method for laying multiple bundles of power cables in a pipeline in this embodiment are used as follows: 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 this 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 second pull rope, the pipeline gradually and slowly falls onto the inner wall of the pipeline from back to front, which greatly ensures the integrity of the cable and avoids cable damage caused by external force or friction, achieving the purpose of safe laying, and the success rate of threading the pipeline is very high. Third, during the use of the device in this embodiment, there is no need to pull out multiple bundles of cables for a long distance in advance, but to pull them out slowly. After pulling them out, an elastic clamping ring is used to bind the multiple bundles of cables and then the second pull rope is used to tighten them, so that the cables can move with the movement of the I-shaped sealing strip. This approach avoids the friction and damage of the cables caused by pulling out the cables for a long distance in advance, and saves space. Fourth, during use, the device in this embodiment only requires two workers to complete, with high efficiency and low labor. Fifth, in this embodiment, after the I-shaped sealing strip is installed in place, the second pull rope can be pulled out to untie multiple bundles of cables so that they can be installed in the laying pipeline. After the second pull rope is pulled out, the elastic clamping ring on the connecting plate returns to its position under the action of its own elastic force, which will not affect the laying of the cables. And because the clamping ring is made of an elastic material, even if the elastic clamping ring is bound or in contact with the cable during the installation process and the process of pulling out the first pull rope, it will not damage the surface of the cable, and has a protective effect on the cable. Sixth, the first pull rope, the second pull rope, the clamping ring, etc. of the present invention can be reused, saving costs.

Claims

1. A device for laying multiple bundles of power cables in a pipeline, comprising a laying pipeline, characterized in that: The upper part of the laying 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. The bottom surface of the lower part of the I-shaped sealing strip is provided with an embedded installation groove that runs through the axial direction of the sealing strip. The lower part of the installation groove has an opening B. A first pull rope is provided in the installation groove, and the first pull rope can be moved in the installation groove by external force. A downwardly extending connecting plate located in the laying pipeline is provided at the lower part of the first pull rope, and a C-shaped groove is provided on the connecting plate. The lower part of the C-shaped groove extends to the edge opening of the connecting plate, and a second pull rope is provided in the C-shaped groove. An elastic clamping ring is provided at the lower part of the connecting plate, one end of the elastic clamping ring is fixed to the connecting plate, and the other end is provided with a through hole, and the second pull rope passes through the through hole and is located in the C-shaped groove.

2. The device for laying multiple bundles of power cables in a pipeline as claimed in claim 1, characterized in that: There are multiple connecting plates arranged on the first pull rope along the axial direction, and each connecting plate is matched with an elastic clamping ring.

3. The device for laying multiple bundles of power cables in a pipeline as claimed in claim 2, 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 in an arc shape concentric with the laying pipeline, and the mounting groove is arranged on the bottom surface of the lower transverse portion.

4. The device for laying multiple bundles of power cables in a pipeline as claimed in claim 3, characterized in that: One end of the first 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.

5. The device for laying multiple bundles of power cables in a pipeline as claimed in claim 4, characterized in that: The elastic clamping ring is a double-strand elastic rope, which passes through the through hole on the connecting plate and is closed. The two strands of the double-strand elastic rope are both tied to the outer wall of the cable and the other end forms the through hole composed of two strands of rope. The second pull rope passes through the through hole and goes around from the bottom opening of the C-shaped groove to the other end of the C-shaped groove.

6. The device for laying multiple bundles of power cables in a pipeline as claimed in claim 5, 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.

7. The device for laying multiple bundles of power cables in a pipeline as claimed in claim 6, 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.

8. A method for laying multiple bundles of power cables in a pipeline, using the power cable laying device in a pipeline as claimed in claim 7, and following the steps: Step 1: Pre-lay pipelines at the construction site where power cables need to be laid; Step 2: A plurality of cable drums are arranged at one end of the laying pipeline, and a plurality of cables are wound on the cable drums. The cable drums also include an I-shaped sealing strip, in which a first draw rope is pre-installed, and the connecting plate is pre-installed on the first draw rope. The through holes on each connecting plate are pre-set with the elastic clamping ring, and then one end of the second draw rope is tied to the blocking part of the first draw rope. Step 3: The first staff member pulls out multiple bundles of cables, ties the heads of the multiple bundles of cables to an elastic clamping ring closest to the blocking part, then passes the second pull rope through the perforation on the elastic clamping ring, enters from the bottom opening of the C-shaped groove on the connecting plate, and wraps around the other end of the C-shaped groove to clamp it; the second staff member holds the pull ring at the end of the I-shaped sealing strip and clamps 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 penetrates into the laying pipeline; Step 4: The first worker continues to tie multiple bundles of cables to the elastic clamping ring, and inserts the second pull rope through the perforation of each elastic clamping ring into the C-shaped groove. The second worker pulls the pull ring of the I-shaped sealing strip forward according to the progress of the first worker to complete the cable insertion until the cable is completely inserted into the laying pipeline; Step 5: After the pipe threading is completed, the first staff member stops working, and the second staff member reaches the other end of the laying pipeline, unties the head of the second pull rope from the blocking part of the first pull rope, and then slowly pulls out the second pull rope; in the process of pulling out the second pull rope, the second pull rope releases the elastic clamping ring, and the elastic clamping ring releases multiple bundles of cables under the action of the rebound force. After the multiple bundles of cables lose the clamping of the elastic clamping ring, they fall into the laying pipeline; after the second pull rope is pulled out, all the cables fall completely into the laying pipeline, and finally the second staff member pulls the first pull rope out of the installation groove to complete the pipe threading of the cable and the sealing of the laying pipeline.

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