Cable laying method in tunnels using electric rollers and electric rollers used in said method

Abstract

By transporting cables within tunnels using an electric roller device secured to cable support fittings, and then moving the cables laterally to the cable support fittings after they have been laid, cable installation can be easily performed without requiring much labor. [Solution] One end of the base 6 of the electric roller device 5 is attached to the tip of each cable support fitting 3, which is installed at intervals along the side wall of the tunnel 1, so that the base 6 protrudes horizontally. The electric rollers 7 are pivotally supported on bearings 8 that protrude from both ends of the upper surface of the base 6, and guide rollers 10, 10 are erected on both sides of the electric rollers 7. The cable 4 is placed on the electric rollers 7 of each electric roller device 5, and the cable 4 is transported by driving and rotating each electric roller 7 to lay the cable 4 to a predetermined position. After that, the guide roller 10 closest to the cable support fitting 3 of each electric roller device 5 is removed, and the cable 4 on each electric roller 7 is moved laterally to the cable support fitting 3 on the side.

Description

Technical Field

[0001] This invention relates to a method for laying cables in a tunnel using an electric roller device and an electric roller device used in this method.

Background Art

[0002] Conventionally, when laying cables in a tunnel, the cable fed out from a cable drum on the ground is sent into the tunnel through a shaft provided on the ground, and the cable is sandwiched and fed out on the floor surface in the tunnel by a hauling machine, a ball roller, etc., and the tip of the cable is transported to a predetermined position in the tunnel. Then, the operator lifts and places the entire transported cable on cable holders provided at regular intervals on one side wall of the tunnel from the floor surface.

[0003] Patent Document 1 shows an example. A plurality of hauling machines for sandwiching and transporting cables from both sides in the tunnel are installed at intervals, a plurality of vertical rollers for supporting the cable are installed between the hauling machines, a main control unit is arranged in a predetermined control area, and the main control unit controls the hauling machines through each sub-control unit. Each of the hauling machines includes a base, a pair of endless tracks arranged movably on the base for sandwiching the cable from both sides, and a pair of rollers arranged behind and in front of the endless tracks on the base. Each sub-control unit determines whether each hauling machine is operating normally and whether the cable is being transported based on the rotation state of the pair of rollers and the load factor in each hauling machine. This is a method for transporting a laid object (cable).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] However, in conventional methods, including the one described in Patent Document 1, the cable is held at a specific point by a hauling machine or ball roller, which means that the cable may be damaged if external force is applied to it. Also, because hauling machines and ball rollers are large, it is time-consuming to transport multiple of these machines into the tunnel. Furthermore, after laying the cable with a hauling machine inside the tunnel, multiple workers must manually place the cable simultaneously onto cable support fittings that are supported at a certain height from the tunnel floor and arranged at regular intervals.

[0006] Therefore, in order to solve the above-mentioned problems, this invention aims to provide a cable laying method and an electric roller device used in this method, which allows for easy cable laying without requiring much effort. This method involves securing small electric rollers to the cable support fittings, transporting the cable from the ground into the tunnel via a manhole, transporting the cable within the tunnel on the electric roller device secured to the cable support fittings, and then moving the cable laterally to the cable support fittings after laying the cable. [Means for solving the problem]

[0007] The invention of claim 1 is a method for laying a cable from the ground through a shaft to a predetermined position inside a tunnel, wherein one end of the base of an electric roller device is attached to the tip of a number of cable support fittings provided at intervals along the side wall inside the tunnel, and the base is made to protrude horizontally, electric rollers are pivotally supported on bearings protruding from both ends of the upper surface of the base, guide rollers are erected from bases located on both sides of the electric rollers, the cable is placed on the electric rollers of each electric roller device, and the cable is transported by driving and rotating each electric roller, after the cable has been transported to the predetermined position, the guide rollers closest to the cable support fittings of each electric roller device are removed, and the cable on the electric roller is moved laterally to the adjacent cable support fitting, thereby providing a tunnel cable laying method using an electric roller device.

[0008] Furthermore, the invention of claim 2 is a tunnel cable laying method using an electric roller device as described in claim 1, wherein a highly rigid guide rod, longer than the distance between adjacent electric roller devices, is attached to the tip of the cable to be laid.

[0009] Furthermore, the invention of claim 3 is a tunnel cable laying method using an electric roller device as described in claim 1 or 2, wherein the electric rollers of each of the plurality of electric roller devices are driven to rotate by detecting the tip of the cable with a sensor installed at the entrance of the tunnel, and the rotation is stopped when the end of the cable is detected by the sensor.

[0010] Furthermore, the invention of claim 4 is a tunnel cable laying method using an electric roller device as described in claim 1 or 2, wherein a certain distance over which a cable is laid in the tunnel is divided into multiple sections, and the cable tip or end is detected by the change in the rotation speed of the electric rollers of the electric roller device in each section, and the rotation or stopping of each electric roller is performed for each section.

[0011] Furthermore, the invention of claim 5 is an electric roller device used in the tunnel cable laying method described in claim 1, wherein the electric roller device, which locks one end to a cable receiving fitting provided on the side wall of the tunnel, has hook-shaped bearings protruding from both ends of the upper surface of a horizontally elongated base, the ends of the electric roller are pivotally supported on the bearings, guide rollers are erected from bases located on both sides of the electric roller and protruding above the electric roller, an insertion locking piece is provided at one end of the base, and the insertion locking piece is swivelable into the central opening at the tip of the cable receiving fitting.

[0012] Furthermore, the invention of claim 6 is an electric roller device according to claim 5, wherein the central opening at the tip of the cable receiving fitting has a square cross-section, the insertion locking piece has a pair of spaced projections, the width of the pair of projections is the same as the left-right width of the central opening at the tip of the cable receiving fitting, each of the pair of projections has an upper edge that slopes downward and tapers to a point, and has a locking recess in the middle of the sloped upper edge, the outer sloped upper edge of the locking recess has a shape that rises upward and then slopes downward, and when the insertion locking piece is inserted and fitted into the central opening at the tip of the cable receiving fitting, the locking recess is locked to a bolt rod that is horizontally extended in the hollow part that continues from the central opening at the tip of the cable receiving fitting. [Effects of the Invention]

[0013] According to the invention of claim 1, compared to the hauling machines and ball rollers conventionally used for laying cables in tunnels, the electric roller device is smaller in size and weight and is used as the drive source for cable transport, making it easy to transport into and remove from the tunnel. Furthermore, unlike the conventional hauling machines and ball rollers that grip and transport cables, the electric roller device transports cables by placing them on the electric rollers of the electric roller device. Therefore, even if an external force is applied to the cable, the cable is not subjected to stress and is less likely to be damaged.

[0014] Furthermore, as mentioned above, because the electric roller device is small and lightweight, it can be attached to the tip of the cable support fittings installed inside the tunnel. This eliminates the need for the conventional work of lifting the cable from the tunnel floor and placing it on the cable support fittings after transporting the cable inside the tunnel, thus reducing the workload.

[0015] Furthermore, according to the invention of claim 2, a rigid guide rod longer than the distance between adjacent electric roller devices is attached to the tip of the cable being transported, so that the cable is guided and placed on the electric roller of the electric roller device at the tip of the adjacent cable support fitting, and the cable is transported smoothly.

[0016] Furthermore, according to the invention of claim 3, the tip and end of the cable are detected by a sensor installed at the entrance of the tunnel, and the electric roller device is driven and stopped accordingly, so that cable transport can be performed by automatic control.

[0017] Furthermore, according to the invention of claim 4, the distance over which the cable is laid is divided into multiple sections, and the cable tip or end is detected by the change in the rotation speed of the electric rollers of the electric roller device in each section, and the rotation or stopping of each electric roller is controlled for each section. As a result, the cable can be transported by automatic control, and the electric rollers of the multiple electric roller devices can be driven more efficiently, contributing to labor saving.

[0018] Furthermore, according to the invention of claim 5, since the insertion locking piece provided at one end of the electric roller device can be fitted into the central opening at the tip of the cable receiving fitting on the side wall of the tunnel, each electric roller device can be easily attached to the cable receiving fitting, and the work can be carried out quickly.

[0019] Furthermore, according to the invention of claim 6, the insertion locking piece has a pair of projections spaced at a certain interval, the upper edge of each projection is inclined downward toward a tapered tip, and has a locking recess in the middle, so that it can be easily inserted into the central opening at the tip of the cable receiving fitting, and can be locked into the locking recess on the horizontal bolt rod in the hollow part following the opening, so that once locked, the electric roller device will not come off the cable receiving fitting unnecessarily. [Brief explanation of the drawing]

[0020] [Figure 1] This is a longitudinal cross-sectional side view of the cable laying method inside a tunnel using an electric roller device according to Embodiment Example 1 of the present invention. [Figure 2] This is a cross-sectional plan view of the cable laying method inside a tunnel using an electric roller device according to Embodiment Example 1 of the present invention. [Figure 3] This is a front view of the electric roller device used in the cable laying method inside a tunnel according to Embodiment Example 1 of this invention. [Figure 4]The rear view of the electric roller device used in the cable laying method in a tunnel by the electric roller device of Embodiment Example 1 of the present invention. [Figure 5] The plan view of the electric roller device used in the cable laying method in a tunnel by the electric roller device of Embodiment Example 1 of the present invention. [Figure 6] The left side view of the electric roller device used in the cable laying method in a tunnel by the electric roller device of Embodiment Example 1 of the present invention [Figure 7] The perspective view of the insertion locking piece of the electric roller device used in the cable laying method in a tunnel by the electric roller device of Embodiment Example 1 of the present invention. [Figure 8] The partial longitudinal section front view of the attachment state of the electric roller device to the cable receiving fitting in the cable laying method in a tunnel by the electric roller device of Embodiment Example 1 of the present invention. [Figure 9] The schematic front view of the state of moving the cable from the electric roller device to the cable receiving fitting in the cable laying method in a tunnel by the electric roller device of Embodiment Example 1 of the present invention. [Figure 10] The perspective view of the cable receiving fitting in the tunnel. [Figure 11] The operation control system explanatory diagram of the electric roller device in the cable laying method in a tunnel by the electric roller device of Embodiment Example 1 of the present invention. [Figure 12] The longitudinal section side view of the cable laying method in a tunnel by the electric roller device of Embodiment Example 2 of the present invention. [Figure 13] The cross-sectional plan view of the cable laying method in a tunnel by the electric roller device of Embodiment Example 3 of the present invention. [Figure 14] The front view of various electric roller devices used in the cable laying method in a tunnel by the electric roller devices of Embodiment Examples 2 and 3 of the present invention.

Modes for Carrying Out the Invention

[0021] (Embodiment Example 1) The cable laying method inside a tunnel using an electric roller device according to Embodiment Example 1 of this invention will be explained with reference to Figures 1 to 11.

[0022] As shown in Figure 1, numerous support fittings 2 are erected on one side wall of the tunnel 1 at intervals along its longitudinal direction. As shown in Figure 10, a flat cable receiving fitting 3 is projected horizontally from each of these support fittings 2 toward the center of the tunnel 1, and a cable 4 is placed and fixed on the cable receiving fitting 3.

[0023] In the cable laying method in the tunnel using the electric roller device, as shown in Figure 1, an electric roller device 5 is attached to the tip of each cable support fitting 3. The specific configuration of the electric roller device 5 is as shown in Figures 3 to 6, with an electric roller 7 mounted horizontally on a base 6 made of horizontal angle material. The electric roller 7 is pivotally supported by bearings 8, 8 provided at both ends of the upper surface of the base 6 and is rotated and driven by a built-in electric motor.

[0024] Furthermore, shaft support receiving pieces 9, 9, each consisting of a pair of upper and lower projections, are provided at both ends of the back surface of the base 6, and the lower end of the shaft of the guide roller 10 is detachably supported by each of these shaft support receiving pieces 9. The guide rollers 10 at both ends are rotatable with respect to the shaft and are positioned approximately at both ends of the electric roller 7, guiding the cable 4 placed on the electric roller 7 so that it does not come off the electric roller 7.

[0025] The electric roller device 5, consisting of the above configuration, is detachably attached to a cable receiving fitting 3 provided on one side wall inside the tunnel 1 via a insertion locking piece 11.

[0026] As shown in Figure 7, the insertable locking piece 11 has parallel projections 13, 13 extending from both the left and right ends of a vertical plate 12 of a certain width. The pair of projections 13 have an inclined upper edge 13a that slopes downward and tapers to a point, and a locking recess 13b in the middle of the inclined upper edge 13a. The inclined upper edge 13a outside the locking recess 13b rises upward again and then slopes downward again, and the lower edge 13c of the projection 13 also has a shape that curves upward at its tip. In addition, a locking plate 14 is provided perpendicular to the vertical plate 12 on the back surface of the vertical plate 11a. As shown in Figure 5, the insertable locking piece 11 is fixed with bolts by overlapping the locking plate 14 with one end of the base 6 of the electric roller device 5.

[0027] Furthermore, the cable support fitting 3 has a rectangular tubular arm 3a positioned in the lower center, the tip of which has an opening 3b, and a roughly horizontal bolt rod 3d is provided in the hollow section 3c with a rectangular cross-section that follows the opening 3b and crosses the hollow section 3c.

[0028] Furthermore, the spacing between the pair of protrusions 13, 13 of the insertion locking piece 11 and the vertical width of each protrusion 13 are approximately the same as the vertical and horizontal width of the hollow portion 3c that follows the central opening 3b at the tip of the cable receiving fitting 3, allowing the pair of protrusions 13, 13 of the insertion locking piece 11 to be freely fitted into the hollow portion 3c from the tip opening 3b.

[0029] Then, the pair of protrusions 13, 13 of the insertion locking piece 11 are inserted into the hollow portion 3c through the tip opening 3b, the tip of the electric roller device 5 is lifted upward, and the tip of the insertion locking piece 11, which is integrated with the electric roller device 5, is tilted using the curvature of the lower edge 13c of each protrusion 13, the tip of each protrusion 13 is passed under the bolt rod 3d of the hollow portion 3c, and when the tip of the electric roller device 5 is lowered, as shown in Figure 8, the locking recesses 13b of each protrusion 13 catch on the bolt rod 3d, the pair of protrusions 13, 13 are locked to the bolt rod 3d, and the insertion locking piece 11 does not come off the cable receiving fitting 3 unnecessarily.

[0030] In this way, the numerous electric roller devices 5 are locked to the ends of each cable support fitting 3 inside the tunnel 1. In this state, as shown in Figure 1, a rigid guide rod 15 longer than the distance between adjacent electric roller devices 5 is attached to the end of the cable 4 that has been brought into the tunnel 1, and each of the electric roller devices 5 is rotated sequentially, allowing the cable 4 to be fed out to each electric roller device 5 and laid inside the tunnel 1.

[0031] Then, once the cable 4 is laid to a predetermined position within the tunnel 1, as shown in Figure 9, the guide roller 10 on the side of each electric roller device 5 closest to the cable support fitting 3 is removed from the shaft support piece 9, and as shown in Figure 2, the cable 4 resting on the electric roller 7 of each electric roller device 5 is moved laterally to the cable support fitting 3 next to each electric roller device 5. After that, the cable 4 is fixed to each cable support fitting 3, and the electric roller devices 5 are removed from each cable support fitting 3.

[0032] Next, the operation control system of each electric roller device 5 in the cable laying method in a tunnel using the electric roller device of this invention will be explained with reference to Figure 11.

[0033] In the tunnel 1, when laying the cable, the section to be laid is divided into multiple sections, for example, section A, section B, section C, and section D (not shown), and a sub-unit power panel 16A, 16B, 16C, and 16D is provided for each section, and power is supplied to these sub-unit power panels from the master unit 17, and they are controlled by a control device (not shown) via a control run consisting of a communication cable or wireless, and an electric roller 7 is driven for each of these sections, and the beginning and end of the cable 4 are detected by proximity sensors (not shown).

[0034] Then, when the proximity sensor detects that the lead of cable 4 has entered section A, as shown in the first step of Figure 11, the electric rollers 7 in section A activate and operate to transport cable 4, while the electric rollers 7 in the other sections, sections B and C, stop operating. Next, when the proximity sensor detects that the lead of cable 4 has entered section B, as shown in the second step of Figure 11, the electric rollers 7 in sections A and B activate and operate to transport cable 4, while the electric rollers 7 in the other section, section C, stop operating.

[0035] Furthermore, when the proximity sensor detects that the leading edge of cable 4 has entered section C, the electric rollers 7 in sections A, B, and C are activated and operated to transport cable 4, as shown in the third step of Figure 11. Then, when the proximity sensor in section A detects the end of cable 4, the operation of the electric roller 7 in section A is stopped, as shown in the fourth step of Figure 11, while the operation of the electric rollers 7 in sections B and C continues.

[0036] By dividing the section in which the cable 4 is laid into multiple sections and operating or stopping the electric roller 7 for each section, the operation of the electric roller device 5 can be made more efficient and labor-saving.

[0037] Furthermore, in the above embodiment example 1, the beginning or end of the cable 4 is detected by a proximity sensor. However, instead, the rotation speed of the electric rollers 7 of each electric roller device 5 is detected to detect the beginning or end of the cable 4, and the electric roller device 5 is operated for each section. Alternatively, without setting sections, the rotation speed of the electric rollers 7 of each electric roller device 5 is detected, and the electric rollers 7 of the electric roller device 5 two or three units ahead are operated. In addition, if the rotation speed of the electric rollers 7 is abnormal for several minutes, the operation of each electric roller device 5 can be stopped.

[0038] Furthermore, in the cable laying method in a tunnel using the electric roller device of this invention, the electric roller device 5 is attached to a plurality of cable support fittings 3 that are attached to support fittings 2 inside the tunnel 1, and these cable support fittings 3 are installed at a certain height from the floor surface of the tunnel 1. On the other hand, cables 4 introduced into the tunnel 1 from the ground are often introduced near the floor surface inside the tunnel 1, and in that case, the introduced cables must be lifted from the floor surface to the height of the cable support fittings 3.

[0039] (Example of Embodiment 2) Figure 12 shows an embodiment example 2 of the present invention, illustrating an example in which the cable is laid up to the cable support fitting 3 while gradually lifting it from the floor surface. In this case, the upward-facing electric roller device 19, which is the same as the electric roller device 5 in Figure 14, is placed directly on the floor surface, an intermediate support member 18 is provided on the cable support fitting 3 and the upward-facing electric roller device 19 is supported by the intermediate support member 18, or the clamp-type electric roller device 25 and downward-facing electric roller device 20 in Figure 14 are used.

[0040] (Example of Embodiment 3) Furthermore, the tunnel 1 is not necessarily a straight tunnel; as shown in Figure 13, there are also tunnels that are horizontally curved. Figure 13 shows Embodiment 3 of this invention, in which case, along with the electric roller device 5, other forms of electric roller devices shown in Figure 14, such as the vertical electric roller device 21 and the clamping electric roller device 25, are used to lay the cable 4 in the horizontally curved tunnel 1. In this case, the lead rod 15 is not attached to the end of the cable 4.

[0041] Figure 14 shows examples of electric roller devices used in cable laying in tunnels 1, as shown in Figures 13 and 14, in addition to the electric roller device 5 described above. In Figure 14, (a) shows an upward-facing electric roller device 19, the same as the electric roller device 5 described above; (b) shows a downward-facing electric roller device 20, which is upside down; (c) shows a vertical-facing electric roller device 21; (d) shows an inclined electric roller device 22; (e) shows a left-curving electric roller device 23; (f) shows a right-curving electric roller device 24; and (g) shows a clamping electric roller device 25. The dotted lines in each figure represent mounting jigs.

[0042] The clamp-type electric roller device 25 in Figure (g) has one side that can be opened, as shown in the right figure. When opened, the cable is placed between the upper and lower rollers and closed, and the cable is held down by the height adjustment spring mechanism on both sides. The distance between the upper and lower rollers can also be fixed by a locking mechanism (not shown).

[0043] In this way, in accordance with the shape and form of the tunnel 1, in addition to the electric roller device 5, the cable 4 can be laid using an upward-facing electric roller device 19, a downward-facing electric roller device 20, a vertical electric roller device 21, an inclined electric roller device 22, a left-curve electric roller device 23, a right-curve electric roller device 24, or a clamping electric roller device 25, which can be placed on the floor surface or attached to the intermediate support member 18. Furthermore, conventional rollers without a drive source can also be used in combination. [Explanation of symbols]

[0044] 1. Tunnel 2. Support hardware 3 Cable support bracket 3a Cross arm 3b Opening 3c Hollow 3D Bolt Rod 4 Cables 5. Electric roller device 6. Base 7 Electric roller 8 Bearing 9 Axis support receiving piece 10 Guide roller 11 Insertion locking piece 12 Vertical plate 13 Projection 13a Inclined upper edge 13b Locking recess 13c Lower edge 14 Locking plate 15 Guide pole 16A Slave unit power panel 16B Slave unit power panel 16C Slave unit power panel 16D Slave unit power panel 17 Main unit 18 Intermediate support material 19 Upward-facing electric roller device 20 Downward-facing electric roller device 21 Vertical type electric roller device 22 Inclined type electric roller device 23 Left-curving electric roller device 24 Right-curving electric roller device 25. Clamp-type electric roller device

Claims

1. In a construction method for laying cables from the ground through a vertical shaft to a predetermined location inside a tunnel, Numerous cable support fittings are installed at intervals along the side wall of the tunnel, and one end of the base of the electric roller device is attached to the tip of each fitting, causing the base to protrude horizontally. The electric roller is pivotally supported by bearings protruding from both ends of the upper surface of the base, and guide rollers are erected from bases located on both sides of the electric roller. The cable is placed on the electric rollers of each of the electric roller devices, and the cable is transported and laid to a predetermined position by driving and rotating each electric roller. A cable laying method for tunnels using electric rollers, characterized by removing the guide rollers near the cable receiving fittings of each electric roller and moving the cables on each electric roller laterally to the respective cable receiving fittings on the side.

2. The cable laying method in a tunnel using an electric roller device according to claim 1, characterized in that a rigid guide rod, longer than the distance between adjacent electric roller devices, is attached to the tip of the cable to be laid.

3. The cable laying method in a tunnel using electric roller devices according to claim 1 or 2, characterized in that each of the plurality of electric roller devices is driven to rotate by detecting the tip of the cable with a sensor installed at the entrance of the tunnel, and the rotation is stopped when the end of the cable is detected by the sensor.

4. A cable laying method in a tunnel using an electric roller device according to claim 1 or 2, wherein a certain distance over which a cable is laid in a tunnel is divided into multiple sections, and the cable tip or end is detected by a change in the rotation speed of the electric roller device in each section, and the rotation or stopping of each electric roller is performed for each section.

5. The electric roller device, which is attached at one end to a cable support fitting provided on the side wall of the tunnel, has hook-shaped bearings protruding from both ends of the upper surface of a horizontally elongated base, and both ends of the electric roller are pivotally supported by these bearings. Guide rollers are erected from bases located on both sides of the electric roller, protruding above the electric roller. An electric roller device for use in a tunnel cable laying method according to claim 1, characterized in that a receptacle is provided at one end of the base, and the receptacle is flexibly fitted into the central opening at the tip of the cable receiving fitting.

6. The central opening at the tip of the cable receiving fitting has a square cross-section, the insertion locking piece consists of a pair of spaced projections, the width of the pair of projections is the same as the left-right width of the central opening at the tip of the cable receiving fitting, each of the pair of projections has an upper edge that slopes downward and tapers to a point, and has a locking recess in the middle of the sloping upper edge, the outer sloping upper edge of the locking recess is raised upward and then slopes downward, The electric roller device according to claim 5, wherein when the insertion locking piece is inserted into and fitted into the central opening at the tip of the cable receiving fitting, the locking recess is locked to a bolt rod that is horizontally extended within the hollow portion following the central opening at the tip of the cable receiving fitting.

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