Cable lead-in device and cable lead-in method

Abstract

An object of the present invention is to solve the problems of the prior art, that is, to provide a cable lead-in device and a cable lead-in method capable of leading a cable back and forth in a conduit a smaller number of times than in the prior art.SOLUTION: The cable pull-in device of the present invention is a device for pulling a cable into a conduit, and includes a rod that can be pushed into the conduit, and coupling means for coupling the cable. Two holding members are formed at the tip of the rotating body of the connecting means, and a locking space surrounded by the two holding members is formed. Further, the rotating body has a locking tool detachably attached to the clamping member, and is rotatable around the axis of the rod. By retracting the rod in a state in which the coupling means and the cable are coupled, the cable can be pulled into the conduit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technique for wiring a power cable, for example, inside a buried pipe, and more specifically to a cable pulling device that can pull a power cable into a pipe, and a method for pulling a power cable into a pipe using the same. [Background technology]

[0002] Power plants generate electricity at several thousand to tens of thousands of volts, but to avoid losses due to electrical resistance, the electricity is converted to ultra-high voltage of around several hundred thousand volts before transmission. The voltage is then gradually reduced at various substations, such as ultra-high voltage substations, primary substations, secondary substations, and distribution substations, before being supplied to factories and other facilities, and is further reduced by pole-mounted transformers before being supplied to homes. In any case, the electricity generated at power plants is supplied to users via transmission and distribution lines that use electric wires and cables (hereinafter collectively referred to as "transmission lines, etc."), and naturally, there are a huge number of transmission lines, etc., deployed throughout the country.

[0003] Traditionally, power lines were mainly strung on power poles, but in recent years, undergrounding has been promoted. For example, according to "Tokyo Electric Power Company in a Table (Tokyo Electric Power Company Holdings, Inc.)," ​​48.0% of Tokyo's wards are underground, and of that, in parts of Chuo Ward, Chiyoda Ward, and Minato Ward, the rate has risen to 88.7%. However, when viewed nationwide, the number of underground sections is still low at 6.0% (both as of 2022), and the current situation is that the majority of power lines are still strung on power poles.

[0004] Burying overhead power lines underground not only improves the urban landscape, but also allows for wider sidewalks and safer use of strollers and wheelchairs as a result of removing power poles. Furthermore, during disasters such as typhoons and earthquakes, roads are not blocked by fallen power poles or hanging overhead power lines, allowing emergency vehicles to pass more smoothly. Furthermore, since the risk of overhead power lines being severed during disasters is reduced, power outages are reduced and electricity can be used more stably. Therefore, it is expected that the undergrounding of power lines will be promoted further in the future.

[0005] Against this background, various technologies have been proposed for burying power transmission lines, etc. For example, Patent Document 1 proposes a technology that allows two or more power cables to be laid inside one conduit. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-158814 Summary of the Invention [Problem to be solved by the invention]

[0007] Figure 9 is a plan view that shows a schematic diagram of the conventional work of pulling a power cable CB into a conduit TB. As shown in this figure, the conventional method of pulling a power cable CB was mainly performed by five workers. Specifically, Worker A and Worker B pull the power cable CB that has passed through the conduit TB, and Worker C winds the power cable CB onto a reel. Meanwhile, Worker D guides the power cable CB into the conduit TB, and Worker E sends out the wound power cable CB while protecting it. A supervisor then monitors the work to prevent accidents or malfunctions.

[0008] According to conventional work, it took a considerable amount of time and effort to pull the power cable CB into the conduit TB. Fig. 10 is a step diagram showing the work procedure up to pulling the power cable CB into the conduit TB, and Fig. 11 is a side view showing the materials used in the work of pulling the power cable CB. Below, with reference to these figures, the series of work up to pulling the power cable CB into the conduit TB will be explained. For convenience, one side of the conduit TB (the left side in Fig. 10) will be referred to as the "starting side," and the other side (the right side in Fig. 10) will be referred to as the "ending side," and the opening on the starting side of the conduit TB will be simply referred to as the "starting opening," and the opening on the ending side will be simply referred to as the "ending opening."

[0009] First, as shown in Figure 10(a), a worker positioned on the starting point side pushes the wire-pulling rod RD from the starting point side toward the terminal point side. Then, when the tip of the wire-pulling rod RD passes through the terminal point opening, a worker positioned on the terminal point side connects the tip of the wire-pulling rod RD to the tip of the wire-pulling rope RP. Once the wire-pulling rod RD and the wire-pulling rope RP are connected, as shown in Figure 10(b), a worker on the starting point side then pulls the wire-pulling rod RD from the terminal point end side toward the starting point side, and as this happens, the wire-pulling rope RP also moves through the conduit TB toward the starting point side. Once the tip of the wire-pulling rope RP passes through the starting point opening, a cleaning tool CL and a bobbin BN are attached to the tip of the wire-pulling rope RP, and an additional wire-pulling rope RP is attached to the starting point side, and a worker on the terminal point side pulls the wire-pulling rope RP from the starting point side toward the terminal point side. At this time, as shown in Figure 10(c), it is confirmed that the cleaning tool CL removes any unwanted material stuck inside the conduit TB, and that the bobbin BN can move so that the following power cable CB can be inserted. For this reason, the cleaning tool CL has a diameter that allows it to abut against the inner circumference of the conduit TB, and the bobbin BN has a diameter that is slightly smaller than the inner diameter of the conduit TB.

[0010] Once the cleaning tool CL and bobbin BN pass through the end opening, the worker at the end removes the cleaning tool CL and bobbin BN and connects the tip of the newly added incoming rope RP to the tip of the power cable CB. Then, as shown in Figure 10(d), the worker at the start point pulls the power cable CB from the end point toward the start point. Pulling the power cable CB into the conduit TB requires at least four trips (two round trips) through the conduit TB, requiring considerable labor and time. Furthermore, as shown in Figure 11, attaching the cleaning tool CL and bobbin BN to the incoming rope RP required numerous parts. This required seven pieces of material, including the untwister BC installed between the incoming rope RP and the cleaning tool CL at the start point, the carabiner CN connecting the cleaning tool CL and bobbin BN, and the untwister BC installed between the bobbin BN and the incoming rope RP at the end point. Therefore, the preliminary work of setting these up required a considerable amount of time and effort, and in addition, the effort of arranging and managing the many materials was also required.

[0011] The object of the present invention is to solve the problems associated with the prior art, that is, to provide a cable pulling device and a cable pulling method that can pull in a cable by moving back and forth through a conduit less times than in the prior art. [Means for solving the problem]

[0012] The present invention was made with a focus on the point of pulling in a power cable connected directly to a rod without using an incoming rope RP, and is based on an unprecedented idea.

[0013] The cable pulling device of the present invention is a device for pulling a cable into a conduit, and includes a rod that can be pushed into the conduit and a connecting means for connecting the cable. The connecting means is attached to the tip of the rod and includes a "fixed body" fixed to the rod and a "rotating body" attached to the fixed body. Two clamping members are formed at the tip of the rotating body, spaced apart from each other, and a locking space is formed between the two clamping members. The rotating body also has a locking device that is detachably attached to the clamping members and is rotatable around the axis of the rod. When the locking device is attached to the clamping members, the locking space is closed by the locking device positioned between the two clamping members. The cable can then be pulled into the conduit by pulling in the rod with the connecting means and the cable connected.

[0014] The cable pulling-in device of the present invention may further include a tubular body having an insertion hole therein. The tubular body is attached to the tip of a rod by inserting the rod having a connecting means attached to the insertion hole. In this case, by pushing the rod with the tubular body attached into the conduit, it is possible to check whether the cable can be pulled into the conduit.

[0015] The cable pulling device of the present invention may also have two passage grooves formed on the tip surface of the tubular body. Two clamping members can pass through the two passage grooves. In this case, if a locking device is attached to the clamping members with the two clamping members passing through the passage grooves, it is possible to prevent the tubular body from falling off the rod.

[0016] The cable pulling device of the present invention may also be configured such that a tapered portion is formed on the cylindrical body, and the tapered portion has an outer shape that decreases in diameter toward the tip.

[0017] The cable pulling device of the present invention may further include a remover attached to the outer periphery of the cylindrical body. In this case, the remover removes unwanted material adhering to the inner surface of the conduit by pushing the rod to which the cylindrical body is attached into the conduit.

[0018] The cable pulling method of the present invention is a method for pulling a cable into a conduit using the cable pulling device of the present invention, and includes a rod pushing step, a cable connecting step, and a rod pulling step. In the rod pushing step, a rod equipped with a connecting means is pushed from the start opening of the conduit to the end opening. In the cable connecting step, the tip of the cable is connected to the connecting means that has passed through the end opening. In the rod pulling step, the rod with the cable connected to the connecting means is pulled toward the start opening. In the cable connecting step, a ring-shaped (or hook-shaped) connecting jig attached to the tip of the cable is inserted into the closed locking space and locked with a locking device attached to the clamping member. In the rod pulling step, the rod is pulled until the tip of the cable passes through the start opening.

[0019] The cable pulling-in method of the present invention can also be a method of checking whether or not the cable can be pulled into the conduit while pushing the rod to which the cylindrical body is attached into the conduit.

[0020] The cable pulling-in method of the present invention can also be a method in which the rod to which the cylindrical body is attached is pushed into the conduit while the remover removes the unwanted material adhering to the inner surface of the conduit. [Effects of the Invention]

[0021] The cable pulling-in device and the cable pulling-in method of the present invention have the following effects. (1) Conventionally, pulling in a power cable required at least four trips (two round trips) inside the conduit, but with the present invention, it is possible to pull in the power cable in just two trips. As a result, the labor and time required for pulling in the power cable can be reduced. (2) Furthermore, the conventional method required a large number of materials (seven items), which was costly to procure and required a considerable amount of effort to manage and prepare. On the other hand, according to the present invention, the work can be carried out by simply preparing the "connecting means" and the "cylindrical body (bobbin) with the remover (cleaning tool)," thereby reducing the procurement costs and the effort required for management and preparation. (3) Furthermore, since the number of steps in the overall work is reduced, the chances of dangerous situations are also reduced, meaning that work can be carried out more safely than before. [Brief explanation of the drawings]

[0022] [Figure 1] (a) is a side view showing a schematic diagram of the cable pulling-in device of the present invention, and (b) is a side view showing a schematic diagram of the situation where a power cable is pulled into a conduit using the cable pulling-in device of the present invention (a cross-sectional view of the inside of conduit TB). [Figure 2] 1A is a side view showing a schematic diagram of a connecting means in which a fastener is attached to a clamping member, and FIG. 1B is a side view showing a schematic diagram of the connecting means in which the fastener has been removed. [Figure 3] 1 is a side view showing a schematic diagram of a power cable connected to a connecting means by using a looped wire rope and a carabiner. FIG. [Figure 4] (a) is a side view showing a schematic diagram of a power cable having a connection jig using a hook at its tip, and (b) is a side view showing a schematic diagram of a power cable having a connection jig using a wire net at its tip. [Figure 5] (a) is a perspective view showing a schematic view of the entire cylindrical body with a remover attached to its outer circumferential surface, and (b) is a partial perspective view showing a schematic view of a cylindrical body with two passage grooves provided on its tip surface. [Figure 6] FIG. 10 is a side view schematically showing a cylindrical body having a tapered portion formed thereon whose diameter gradually decreases toward the tip end surface. [Figure 7] 1 is a flow chart showing the flow of main steps up to pulling a power cable into a conduit using the cable pulling device of the present invention. [Figure 8]3 is a step diagram showing each process up to pulling a power cable into a conduit using the cable pulling-in device of the present invention. FIG. [Figure 9] FIG. 1 is a plan view schematically showing a conventional operation of pulling a power cable into a conduit. [Figure 10] FIG. 1 is a step diagram showing the procedure for pulling a power cable into a conduit. [Figure 11] FIG. 2 is a side view schematically showing each material used in the pulling-in operation of the power cable CB. DETAILED DESCRIPTION OF THE INVENTION

[0023] An example of an embodiment of the cable pulling-in device and cable pulling-in method of the present invention will be described with reference to the drawings. The present invention can be used to pull various cables into a conduit. For convenience, the example will be described here using pulling a power cable into a conduit. As in Figure 10, one side of the conduit will be referred to as the "starting side" and the other side as the "ending side," and the opening on the starting side of the conduit will be simply referred to as the "starting opening" and the opening on the ending side will be simply referred to as the "ending opening."

[0024] 1.Overview 1 is a diagram showing a schematic overview of the present invention, where (a) is a side view showing a cable pulling-in device 100 of the present invention, and (b) is a side view showing a situation in which a power cable 400 is pulled into a conduit TB using the cable pulling-in device 100 of the present invention (the inside of the conduit TB is a cross-sectional view). As shown in this figure, the cable pulling-in device 100 of the present invention is mainly composed of a rod 200 and a connecting means 300, and the connecting means 300 is attached to the tip of the rod 200. The connecting means 300 is capable of connecting the power cable 400.

[0025] 1(b), a procedure for pulling a power cable 400 into a conduit TB using the cable pulling device 100 of the present invention will be described. First, a worker on the starting point side inserts a rod 200, to which a connecting means 300 is attached at its tip, into the conduit TB through the starting point opening and pushes the rod 200 toward the end point side. Once the connecting means 300 passes through the end point opening, the worker connects the tip of the power cable 400 (the left end in the figure) to the connecting means 300. Then, with the power cable 400 connected to the connecting means 300, the worker on the starting point side pulls the rod 200 toward the starting point side. Once the tip of the power cable 400 passes through the starting point opening, the worker detaches the power cable 400 from the connecting means 300, and the power cable 400 is thus laid in the conduit TB.

[0026] 2. Cable entry device Next, the cable pulling-in device 100 of the present invention will be described in detail with reference to the drawings. The cable pulling-in method of the present invention is a method of pulling a power cable 400 into a conduit TB using the cable pulling-in device 100 of the present invention. Therefore, the cable pulling-in device 100 of the present invention will be described first, and then the cable pulling-in method of the present invention will be described in detail.

[0027] The cable pulling-in device 100 of the present invention is configured to include the rod 200 and the connecting means 300 as described above, and may also be configured to include the cylindrical body 500 and the remover 600. Below, each of the main elements that make up the cable pulling-in device 100 of the present invention will be explained.

[0028] (rod) The rod 200 constituting the cable pulling-in device 100 is a rod-shaped or tubular long member, and a conventional rod or tubular rod can be used. The rod 200 is inserted into the conduit TB and travels back and forth within the conduit TB. Therefore, the rod 200 constituting the cable pulling-in device 100 has an outer diameter that is sufficiently smaller than the inner diameter of the conduit TB.

[0029] (Connection means) Figure 2 is a schematic diagram showing the connecting means 300 that constitutes the cable pulling device 100, where (a) is a side view showing the connecting means 300 with a locking device 322 attached to a clamping material 321, and (b) is a side view showing the connecting means 300 with the locking device 322 removed.

[0030] As shown in Fig. 2, the connecting means 300 is attached to the tip of the rod 200 when in use. For example, in Fig. 2, the connecting means 300 is attached to a relay pipe MP fixed to the tip of the rod 200. This relay pipe MP is hollow and is fixed by inserting it into the rod 200 and crimping it. Furthermore, threads are formed on the outer peripheral surface of the relay pipe MP and on the inner peripheral surface of the connecting means 300 (particularly the fixed body 310), i.e., the connecting means 300 is screwed into the relay pipe MP, and therefore the connecting means 300 is detachably attached to the rod 200. Of course, as long as the connecting means 300 can be attached to the tip of the rod 200, various conventional methods can be adopted, not limited to the configuration shown in Fig. 2.

[0031] The coupling means 300 is mainly composed of a fixed body 310 and a rotating body 320. Of these, the fixed body 310 is a member to be attached to the rod 200, for example by being screwed into the relay pipe MP. On the other hand, the rotating body 320 is attached to the tip of the fixed body 310 and is rotatable around the axis of the rod 200 (left and right direction in the figure). This allows the twist of the power cable 400 attached to the coupling means 300 to be untwisted when it travels back and forth within the pipe TB.

[0032] Two clamping members 321 are formed at the tip of the rotor 320, spaced apart from each other, and a locking space 323 is formed between the two clamping members 321. For example, in FIG. 2, a U-shaped locking space 323 is formed surrounded by the two clamping members 321. Each clamping member 321 is provided with an insertion hole, and a columnar locking device 322 is inserted into these insertion holes. In other words, the locking device 322 is disposed between the two clamping members 321 so as to be approximately perpendicular (including perpendicular) to the axis of the rod 200, and is then attached to the rotor 320.

[0033] As shown in Figure 2(b), the locking device 322 can be removed from the rotating body 320; that is, the locking device 322 is detachably attached to the rotating body 320. For example, a screw may be provided in the insertion hole of one of the clamping members 321 (the lower clamping member 321 in Figure 2) and a screw may be provided on one end side (the lower end side in the figure) of the locking device 322, so that the locking device 322 is screwed into the rotating body 320. When the locking device 322 is attached to the rotating body 320, the locking space 323 becomes a closed space in plan view, whereas when the locking device 322 is removed from the rotating body 320, the locking space 323 becomes a space with an open tip side.

[0034] The power cable 400 is connected to the connecting means 300 using a jig provided at the tip of the power cable 400, or using a connecting jig 700 such as a carabiner or a shackle. For example, in Fig. 3 , the power cable 400 is connected to the connecting means 300 using a looped wire rope WR provided at the tip of the power cable 400 and a connecting jig 700 that uses a carabiner. More specifically, the connecting jig 700 is inserted into a locking space 323 closed by a locking device 322, and a portion of the connecting jig 700 is locked by the locking device 322. The wire rope WR is attached to the connecting jig 700, thereby connecting the power cable 400 to the connecting means 300.

[0035] A connecting jig 700 using a hook is provided at the tip of the power cable 400 shown in Figure 4(a). In this case, the connecting jig 700 can be directly locked to the locking device 322 of the connecting means 300, or it can be connected to the connecting means 300 via the connecting jig 700 of a carabiner, as shown in Figure 3. Furthermore, a connecting jig 700 using a wire net is provided at the tip of the power cable 400 shown in Figure 4(b). In this case, too, a connecting ring provided at the tip of the connecting jig 700 can be locked to the locking device 322, or it can be connected to the connecting means 300 via the connecting jig 700 of a carabiner, as shown in Figure 3.

[0036] (Cylindrical body and removal body) FIG. 5 is a schematic diagram illustrating the tubular body 500 and the remover 600 that constitute the cable pulling device 100. FIG. 5(a) is a perspective view showing the entire tubular body 500 with the remover 600 attached to its outer periphery, and FIG. 5(b) is a partial perspective view showing the tubular body 500 with two passage grooves 530 provided on its distal end surface 521. As shown in this figure, the tubular body 500 has an insertion hole 510 therein and has a tubular (cylindrical) external shape. As shown in FIG. 5(a), the insertion hole 510 is formed so as to open to the end surface (hereinafter referred to as the "rear end surface 522") that serves as the starting point when the cable pulling device 100 of the present invention is used (hereinafter simply referred to as "in use"). The tubular body 500 is attached to the distal end of the rod 200 by inserting the rod 200, to which the connecting means 300 is attached, into the insertion hole 510. Therefore, the insertion hole 510 is formed with an inner diameter large enough to allow the connection means 300 to be inserted therein.

[0037] 5(b), two passing grooves 530 can be provided on the end face of the cylindrical body 500 that will be the end point during use (hereinafter referred to as the "tip face 521"). The passing grooves 530 are groove-shaped holes through which the clamping members 321 of the connecting means 300 (rotating body 320) can pass. Therefore, when the connecting means 300 is inserted into the insertion hole 510, the clamping members 321 pass through the passing grooves 530 and protrude from the tip face 521. Then, by attaching locking devices 322 to the clamping members 321 protruding from the tip face 521, the clamping members 321 and the locking devices 322 function as stoppers, which means that the cylindrical body 500 can be prevented from falling off the rod 200.

[0038] The cylindrical body 500 constituting the cable pulling device 100 performs a function similar to that of the bobbin BN shown in FIG. 10 . In other words, the cylindrical body 500 is moved within the conduit TB in advance to determine whether the power cable 400 can be pulled into the conduit TB. For example, when the cylindrical body 500 penetrates the conduit TB, it is determined that the power cable 400 can be pulled into the conduit TB. On the other hand, when the cylindrical body 500 cannot move any further within the conduit TB, it is determined that the power cable 400 cannot be pulled into the conduit TB. For this reason, the cylindrical body 500 has a diameter slightly smaller than the inner diameter of the conduit TB. The cylindrical body 500 can also be shaped to allow smoother movement within the conduit TB. For example, the cylindrical body 500 shown in FIG. 6 has a tapered portion 540 formed on the end side during use, and its diameter gradually decreases toward the distal end surface 521.

[0039] As shown in FIGS. 5 and 6, a remover 600 can be attached to the outer circumferential surface of the cylindrical body 500. This remover 600 performs the same function as the cleaning tool CL shown in FIG. 10. In other words, the cylindrical body 500 is moved inside the pipeline TB in advance, and the remover 600 removes unwanted matter that has become stuck inside the pipeline TB. For this reason, the remover 600 has a diameter large enough to abut against the inner periphery of the pipeline TB. For example, the remover 600 shown in FIGS. 5 and 6 is attached to the outer circumferential surface of the cylindrical body 500 in multiple layers, each layer being a ring-shaped plate with a hollowed-out center. The remover 600 can be formed, for example, from a resin or the like.

[0040] The remover 600 may be attached to the end point side of the cylindrical body 500 during use. Alternatively, the remover 600 may be attached to the rod 200 independently, so to speak, without being attached to the cylindrical body 500. In that case, the remover 600 may be attached to the rod 200 on the end point side of the cylindrical body 500 during use, or the remover 600 may be attached to the rod 200 on the starting point side of the cylindrical body 500 during use.

[0041] 3. Cable entry method Next, the cable introduction method will be described in detail with reference to Figures 7 and 8. The cable introduction method of the present invention is a method of introducing a power cable 400 into a conduit TB using the cable introduction device 100 described up to this point. Therefore, we will avoid any explanation that overlaps with the content explained for the cable introduction device 100, and will mainly explain the content unique to the cable introduction method of the present invention. In other words, content not described here is the same as that explained in "2. Cable introduction device."

[0042] Fig. 7 is a flow chart showing the flow of the main steps up to pulling the power cable 400 into the conduit TB using the cable pulling device 100 of the present invention, and Fig. 8 is a step diagram showing each step. When pulling the power cable 400 into the conduit TB using the cable pulling device 100, first, as shown in Fig. 8(a), the rod 200 to which the connecting means 300 is attached is inserted into the insertion hole 510, and the tubular body 500 to which the remover 600 is attached on its outer periphery is attached to the tip of the rod 200 (Step 10 in Fig. 7). At this time, it is preferable to attach a locking tool 322 to a clamping member 321 protruding from a tip surface 521 to prevent the tubular body 500 from falling off the rod 200.

[0043] Once the cylindrical body 500 is attached to the tip of the rod 200, the worker on the starting point side inserts the rod 200 into the conduit TB from the opening of the starting point and pushes the rod 200 toward the end point (Step 20 in Fig. 7). At this time, as shown in Fig. 8(b), the remover 600 removes any unwanted material attached to the inside of the conduit TB, and it is possible to determine whether or not the power cable 400 can be pulled in depending on the movement of the cylindrical body 500.

[0044] When the cylindrical body 500 passes through the end point opening, as shown in Fig. 8(c), the cylindrical body 500 is removed from the rod 200 (Step 30 in Fig. 7), and the tip of the power cable 400 is connected to the connecting means 300 (Step 40 in Fig. 7). At this time, the power cable 400 can be connected to the connecting means 300 using a connecting jig 700 (such as a carabiner), or a connecting jig 700 (such as a hook) provided at the tip of the power cable 400 can be directly connected to the connecting means 300.

[0045] Once the tip of the power cable 400 is connected to the connecting means 300, as shown in Fig. 8(d), the worker on the starting point side then pulls the rod 200 toward the starting point side (Step 50 in Fig. 7). Then, once the tip of the power cable 400 passes through the starting point opening, the connection between the power cable 400 and the connecting means 300 is released (Step 60 in Fig. 7), and the power cable 400 is now laid in the conduit TB. [Industrial Applicability]

[0046] The cable pulling device and cable pulling method of the present invention can be used to pull various cables, including power cables, into conduits. According to the present invention, power transmission lines and the like can be buried underground efficiently and safely, which improves the urban landscape, allows strollers and wheelchairs to be used safely, and provides a stable supply of electricity even during disasters. Considering this, the present invention can be expected to not only be used industrially but also make a significant contribution to society. [Explanation of symbols]

[0047] 100 Cable entry device of the present invention 200 Rod (of cable entry device) 300 (Cable entry device) connection means 310 (of connecting means) fixed body 320 Rotating body (of connecting means) 321 (rotating body) clamping material 322 (rotating body) locking device 323 (rotating body) locking space 400 Power cable (cable entry equipment) 500 (Cable entry device) cylindrical body 510 (Cylindrical body) insertion hole 521 (Cylindrical body) tip surface 522 (of a cylindrical body) rear end surface 530 (Cylindrical body) passage groove 540 (Cylindrical body) tapered part 600 (Cable entry device) removal body 700 (Cable entry device) connection jig BC Untwister BN bobbin CB power cable CL cleaning tools CN Carabiner MP relay pipe RD Wire Pulling Rod RP Entry Rope TB conduit WR Wire Rope

Claims

1. A device for pulling a cable into a conduit, a rod that can be pushed into the conduit; a connecting means attached to the tip of the rod and connecting the cable; the connecting means has a fixed body fixed to the rod and a rotating body attached to the fixed body, Two clamping members are formed at the tip of the rotor with a gap therebetween, and a locking space is formed between the two clamping members; the rotating body has a locking tool that is detachably attached to the clamping member and is rotatable around the axis of the rod; When the locking tool is attached to the clamping material, the locking space is closed by the locking tool disposed between the two clamping materials, By pulling in the rod with the connecting means and the cable connected, the cable can be pulled into the conduit. A cable pulling device characterized by:

2. Further provided is a cylindrical body having an insertion hole therein, The rod to which the connecting means is attached is inserted into the insertion hole, whereby the cylindrical body is attached to the tip of the rod; By pushing the rod to which the cylindrical body is attached into the conduit, it is possible to check whether the cable can be pulled into the conduit.

2. The cable entrance device according to claim 1.

3. Two passage grooves through which the two clamping members can pass are formed on the tip surface of the cylindrical body, When the locking tool is attached to the two clamping members in a state where the two clamping members have passed through the passage groove, the cylindrical body can be prevented from falling off the rod.

3. The cable entrance device according to claim 2.

4. The cylindrical body has a tapered portion formed thereon, the diameter of which decreases toward the tip.

3. The cable entrance device according to claim 2.

5. Further provided is a remover attached to the outer periphery of the cylindrical body, The rod to which the cylindrical body is attached is pushed into the pipeline, whereby the remover removes unwanted matter adhering to the inner surface of the pipeline.

3. The cable entrance device according to claim 2.

6. A method for pulling a cable into a conduit using a cable pulling device, comprising: The cable pulling device has a rod that can be pushed into the pipeline and a connecting means attached to a tip of the rod, the connecting means has a fixed body fixed to the rod and a rotating body attached to the fixed body, Two clamping members are formed at the tip of the rotor with a gap therebetween, and a locking space is formed between the two clamping members; the rotating body has a locking tool that is detachably attached to the clamping member and is rotatable around the axis of the rod; a rod pushing step of pushing the rod to which the connecting means is attached from a start point opening to an end point opening of the pipeline; a cable connecting step of connecting a tip of the cable to the connecting means that has passed through the end point opening; a rod retracting step of retracting the rod, to which the cable is connected to the connecting means, toward the starting point opening, In the cable connecting step, a ring-shaped or hook-shaped connecting jig attached to the tip of the cable is inserted into the closed locking space and locked to the locking tool attached to the clamping material, In the rod retracting step, the rod is retracted until the tip of the cable passes through the starting point opening. A cable insertion method characterized by the above.

7. The cable pulling device has a cylindrical body having an insertion hole therein, By inserting the connecting means and the rod into the insertion hole, the cylindrical body is attached to the tip of the rod, In the rod pushing step, the rod to which the cylindrical body is attached is pushed into the conduit, and it is confirmed whether the cable can be pulled into the conduit.

7. The cable pulling method according to claim 6.

8. The cable pulling device has a removal body attached to the outer periphery of the cylindrical body, In the rod pushing step, the rod to which the cylindrical body is attached is pushed into the pipeline while the remover removes unwanted matter adhering to the inner surface of the pipeline.

8. The cable pulling method according to claim 7.

Images