JP2010233412A - Device for preventing fall of hand hole cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preventing fall of a hand hole cover by tightly catching the heavy hand hole cover of approximately 50 kg or more in the hand hole and by reliably preventing fall of the hand hole cover and facilitating mounting of the device. <P>SOLUTION: The device for preventing fall of the hand hole cover includes two pipe jigs connecting a main pipe and a stroke pipe with a plurality of adjustor bolts mounted at each end in a length adjustable manner, and a fall prevention member is fitted between the two pipe jigs. The adjustor bolts include press-contacts at ends. Three nuts for screwing the adjustor bolts are mounted at each end of the main pipe and the stroke pipe, and the three adjustor bolts are fitted through the three nuts for screwing the adjustor bolts. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a handhole lid fall prevention device for preventing the occurrence of an accident in which a handhole lid falls into a handhole.

  As this type of conventional fall prevention device, for example, there is a manhole fall prevention device as disclosed in Patent Document 1.

  This device has a mesh-structured main body having a disk shape inserted in the upper part of the manhole, that is, in the vicinity of the upper opening, with a certain gap from the inner wall of the manhole, and the main body is detachably fixed to the manhole cover frame. A fixing member is provided.

  This manhole cover frame has a substantially U-shape and is attached to the upper part of the manhole surrounded by the outside of the manhole with the open side up, and the manhole center side of the manhole cover frame A bolt hole through which a bolt for fixing the fixing member passes is provided in the flange portion disposed in the. That is, the fixing member is detachably fixed to the flange portion.

  However, since a general manhole cover has a round shape, it does not fall into the manhole. However, in the case of a handhole cover, the shape is rectangular, so it falls into the handhole depending on the orientation of the cover. there is a possibility.

  For example, when the handhole cover is raised, the handhole cover itself can be inserted along the diagonal line of the upper opening of the handhole, so that it easily falls. This causes a great deal of damage such as damaging various cables in the handhole.

  For this reason, conventionally, as disclosed in Patent Document 2, at least one lid is formed by fitting at least one rectangular lid to a rectangular receiving frame installed around the opening of the manhole. There has been proposed a manhole cover fall prevention structure having a structure in which the body covers the opening of the manhole so as to be openable and closable.

  This device has a rectangular or net-like or knitted fabric on the inside of the receiving frame, corresponding to the lid that fits the receiving frame, and below the manhole opening. The knitted fabric is arranged in a state where it is spread over the cover portion by detachably attaching to the inner part of the receiving frame at a plurality of positions of at least one set of edge portions facing each other in the rectangular knitted fabric. The lid is prevented from falling from the opening.

  In this structure, each of at least one set of edge portions of the knitted fabric attached to the inner portion of the receiving frame has a long rod shape or plate shape extending along the inner portion of the receiving frame, and the knitting A plurality of connections that attach a stress distribution member that disperses the stress with respect to an external load in the fabric in the longitudinal direction, and that the stress distribution member and the inner portion of the receiving frame are detachable from at least one of them. By connecting with a member, the knitted fabric can be removably attached to the inner part of the receiving frame.

  Furthermore, as disclosed in Patent Document 3, there is a tension rod for preventing furniture to fall or for holding a shelf such as a toilet, and it is conceivable to use this as a handhole lid fall prevention device.

  The tension rod has a threaded rod projecting from one end of the straight pipe in the axial direction, and a rotational pressing member is screwed onto the threaded rod, and is supported by being supported on the support surface by the rotation of the rotational pressing member. A cam that contacts the screw rod base or the pressure contact member, and the cam presses the screw rod base or the pressure contact member by rotation of a lock lever integrally connected to the rotation shaft of the cam. It is configured.

Japanese Patent Laid-Open No. 7-207691 Japanese Patent Laid-Open No. 10-204903 JP-A-9-262147

  However, since the above-described fall prevention device of Patent Document 1 is for a circular manhole, it is difficult to use it as a fall prevention device for handhole lids having different shapes.

  Moreover, the fall prevention structure of the manhole cover of patent document 2 fits at least one rectangular cover body in the rectangular receiving frame installed around the opening part of a manhole, and a manhole is carried out by at least one cover body. The opening of the cover is openable and closable, and at the same time, a net-like or sheet-like knitted fabric having a rectangular shape is formed on the inner side of the receiving frame, corresponding to the lid to be fitted to the receiving frame, and below and Since the manhole opening is arranged in a state where it is spread over the cover by the lid, the structure becomes very complicated and expensive.

  Further, the tension rod of Patent Document 3 is configured such that the cam presses the screw rod base or the pressure contact member by the rotation of the lock lever integrally connected to the rotation shaft of the cam. When it is used as a prevention device, it cannot be said that the strength with such a cam tension is sufficient, and when a handhole cover having a weight of about 50 kg or more falls, it cannot withstand the impact and load. It will be a thing.

  Therefore, the present invention was created in view of the existing circumstances as described above, and securely receives a handhole cover that is a heavy object of about 50 kg or more in the handhole to ensure that the handhole cover is dropped. It is an object of the present invention to provide a handhole lid fall prevention device that can be prevented and that is easy to attach.

  The handhole cover fall prevention device according to the present invention comprises two pipe jigs each having a main pipe having a plurality of adjuster bolts attached to each end thereof and a stroke pipe connected to be adjustable in length. The above-described problem has been solved by attaching the fall prevention member between the pipe jigs.

  Moreover, the adjuster bolt is provided with a crimping portion at the end, thereby solving the same problem as described above.

  Furthermore, a plurality of adjuster bolt screwing nut parts are provided at the respective ends of the main pipe and the stroke pipe, and a plurality of adjuster bolts are attached via the plurality of adjuster bolt screwing nut parts. Solved the above-mentioned problems.

  Also, three adjuster bolt screwing nuts are provided at the respective ends of the main pipe and the stroke pipe, and the three adjuster bolts are attached via the three adjuster bolt screwing nuts. The problem described above has been solved.

  In addition, the main pipe and the stroke pipe are connected via a length adjusting portion, and the length adjusting portion includes a plurality of pin insertion holes provided along the longitudinal direction of the main pipe, and the pin insertion holes. A plurality of pin insertion holes provided along the longitudinal direction of the stroke pipe corresponding to the above, and the stroke pipe is inserted into the main pipe, and the fall prevention fixing pins are inserted into the pin insertion holes that match each other. The problem mentioned above was solved by being formed like this.

  Further, the fall prevention member is a protective belt or a protective net made of Kevlar fiber, thereby solving the above-mentioned problem.

  The handhole cover fall prevention device according to the present invention comprises two pipe jigs each having a main pipe having a plurality of adjuster bolts attached to each end thereof and a stroke pipe connected to be adjustable in length. Since the fall prevention member is attached between the two pipe jigs, even if the hand hole cover falls in the hand hole, the two pipe jigs themselves in the hand hole and the two pieces The fall prevention member existing between the pipe jigs can firmly receive a handhole cover that is a heavy object of about 50 kg or more.

  Therefore, it is possible to ensure safety in the hand hole and prevent occurrence of a situation where various cables are damaged by dropping of the hand hole cover.

  In addition, since the adjuster bolt has a crimping part at the end, it is possible to obtain sufficient tensile strength against the inner wall surface of the handhole by pressing the crimping part of the adjuster bolt strongly against the inner wall surface of the handhole. It can be easily installed in the hand hole.

  Furthermore, a plurality of adjuster bolt screwing nuts are provided at the respective ends of the main pipe and the stroke pipe, and a plurality of adjuster bolts are attached via the plurality of adjuster bolt screwing nuts. By firmly pressing the pressure-bonding part of the adjuster bolt against the inner wall surface of the hand hole, it is possible to securely receive the hand hole cover that is a heavy object of about 50 kg or more and to obtain the tensile strength that prevents the hand hole cover from falling.

  Also, three adjuster bolt screwing nuts are provided at the respective ends of the main pipe and the stroke pipe, and the three adjuster bolts are attached via the three adjuster bolt screwing nuts. Therefore, it is possible to reliably obtain the tensile strength that prevents the handhole lid from falling, and the three adjuster bolts do not get in the way, and the workability in the handhole is also improved.

  In addition, the main pipe and the stroke pipe are connected via a length adjusting portion, and the length adjusting portion includes a plurality of pin insertion holes provided along the longitudinal direction of the main pipe, and the pin insertion holes. A plurality of pin insertion holes provided along the longitudinal direction of the stroke pipe are provided, and the stroke pipe is inserted into the main pipe, and the fixing pins are inserted into both pin insertion holes that match each other. Therefore, the length of the stroke pipe can be adjusted in advance with the fixing pin and the pin insertion hole before entering the hand hole, so that the installation work in the hand hole can be performed smoothly.

  In addition, since the fall prevention member is a protective belt or protective net made of Kevlar fiber, the hand hole lid can be firmly received to prevent the hand hole lid from falling down, and it has excellent rust and corrosion resistance. A fall prevention device for a handhole lid can be provided.

It is a perspective view which shows the shape of the pipe jig which comprises the fall prevention apparatus of a handhole cover. It is a side view which shows the shape of the pipe jig which comprises the fall prevention apparatus of a handhole cover. The example of a structure of an adjuster bolt is shown, (a) is a perspective view of the adjuster bolt provided with a nut for preventing rotation of the bolt, and (b) is a perspective view of the adjuster bolt not provided with a nut for preventing rotation of the bolt. FIG. It is a perspective view which shows the state which is screw-feeding an adjuster bolt using a ratchet type torque wrench. In the case where the bolt for preventing rotation of the bolt is provided on the adjuster bolt, it shows a process of tightening the nut for preventing rotation of the bolt, and (a) shows that the crimping portion of the adjuster bolt is pressed against the inner wall surface of the handhole. The side view which shows the state which is going to rotate the nut for rotation prevention of one bolt located in the adjuster bolt screwing nut part side in the state currently fixed to the inner wall surface of the handhole in a stretched manner. b) is a side view showing a state in which the rotation prevention nut of one of the bolts positioned on the side of the adjuster bolt screwing nut portion is rotated and is firmly applied to the side surface of the adjuster bolt screwing nut portion; Is a side view showing a state in which the rotation prevention nut of the other bolt is rotated and is firmly applied to the side surface of the rotation prevention nut of one bolt. A. The example of a structure of a length adjustment part is shown, (a) is a perspective view of a fixed pin, (b) is a state in which the fixed pin is inserted into both pin insertion holes that match each other of the main pipe and the stroke pipe. It is a perspective view. It is a side view which shows the state which attached the pipe jig in the hand hole. It is a perspective view which shows the state which attached the two pipe jig | tool in the hand hole, and attached the fall prevention member using two protection belts to the two pipe jig | tool. It is a perspective view which shows the state which has attached the fall prevention member which used the protection net | network to two pipe jigs.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1, 8, and 9, the handhole cover fall prevention device according to the present invention includes two pipe jigs 1 and a fall prevention member attached between the two pipe jigs 1. 11. The two pipe jigs 1 are fixed in the hand hole H as shown in FIGS.

  As shown in FIG. 1 and FIG. 2, the pipe jig 1 constituting the handhole lid fall prevention device is composed of a main pipe 1a and a stroke pipe 1b each having a plurality of adjuster bolts 2 attached to respective ends. It is formed to be adjustable.

  As shown in FIG. 1 and FIG. 3A, the main pipe 1a constituting the pipe jig 1 has a total of three adjuster bolt screws on the outer peripheral surface of one opening end at intervals of 120 degrees. A wearing nut portion 3 is provided. The adjuster bolt screwing nut portion 3 has a predetermined pedestal portion between the main pipe 1a and the nut portion, and is fixed to the main pipe 1a so that the nut portion is slightly separated from the main pipe 1a.

  Each of these adjuster bolt screwing nut portions 3 is provided in the main pipe 1a so that the screw hole of the nut portion extends along the longitudinal direction of the main pipe 1a, and the adjuster bolt 2 is screwed into the screw hole from the outside. It is like that.

  A substantially cylindrical crimp portion 2 a is fixed to one end portion of the adjuster bolt 2 facing outward. The crimping part 2 is made of hard rubber or the like as a material, and a predetermined anti-slip process is applied to the end face thereof. Further, in the adjuster bolt 2 after being screwed into the screw hole of the adjuster bolt screwing nut portion 3, a locking nut 4 is fixed to the other end portion facing inward by means of welding or the like.

  Furthermore, the portion of the adjuster bolt 2 exposed between the locking nut 4 and the adjuster bolt screwing nut portion 3 is shown in FIGS. 3 (a) and 5 (a) to (c). Two nuts 5 for preventing rotation of bolts are screwed together.

  As shown in FIG. 3B, the pipe jig 1 may be configured without attaching the nut 5 for preventing rotation of the bolt to the adjuster bolt 2.

  Further, a laterally U-shaped frame-shaped grip portion 10 is provided on the other opening end side of the main pipe 1a.

  On the other hand, the stroke pipe 1b constituting the pipe jig 1 is also screwed in a total of three adjuster bolts at intervals of 120 degrees on the outer peripheral surface of one opening end as shown in FIGS. A nut portion 3 is provided.

  Each of these adjuster bolt screwing nut portions 3 is provided in the main pipe 1a so that the screw hole of the nut portion extends along the longitudinal direction of the main pipe 1a, and the adjuster bolt 2 is screwed into the screw hole from the outside. It is like that.

  A substantially cylindrical crimp portion 2 a is fixed to one end portion of the adjuster bolt 2 facing outward. The crimping part 2 is made of hard rubber or the like as a material, and a predetermined anti-slip process is applied to the end face thereof. Further, in the adjuster bolt 2 after being screwed into the screw hole of the adjuster bolt screwing nut portion 3, a locking nut 4 is fixed to the other end portion facing inward by means of welding or the like.

  Further, the portion of the adjuster bolt 2 exposed between the locking nut 4 and the adjuster bolt screwing nut portion 3 is provided for preventing rotation of the two bolts as shown in FIGS. A nut 5 is screwed.

  The pipe jig 1 may be configured without attaching the bolt rotation prevention nut 5 to the adjuster bolt 2.

  The main pipe 1a and the stroke pipe 1b are connected via a predetermined length adjusting unit.

  Specifically, as shown in FIGS. 1 and 2, the main pipe 1a is provided with a plurality of pin insertion holes 6 at equal intervals from the other opening end to the center and along the longitudinal direction of the main pipe 1a. Provided. The pin insertion hole 6 penetrates the main pipe 1a in the vertical direction.

  On the other hand, as shown in FIGS. 1 and 2, the stroke pipe 1b has an outer diameter slightly larger than the inner diameter of the main pipe 1a so that the stroke pipe 1b can be inserted into the inside from the other opening end side of the main pipe 1a. It is formed to become small

  Also, as shown in FIGS. 1 and 2, a plurality of pin insertion holes 6 are provided at equal intervals from the other open end of the stroke pipe 1b to substantially the center along the longitudinal direction of the stroke pipe 1b. The pin insertion hole 6 penetrates the stroke pipe 1b in the vertical direction. Moreover, the pin insertion hole 6 of the stroke pipe 1b is located so as to correspond to the pin insertion hole 6 of the main pipe 1a.

  The other open end of the stroke pipe 1b is inserted into the main pipe 1a from the other open end side of the main pipe 1a to constitute the pipe jig 1. At this time, the main pipe 1a and the stroke pipe are formed. The entire length of the pipe jig 1 is adjusted by matching the pin insertion holes 6 of 1b at arbitrary positions.

  The fixed pins 7 are inserted into the pin insertion holes 6 of the matching main pipe 1a and stroke pipe 1b, and the predetermined length of the pipe jig 1 is maintained.

  As shown in FIG. 6A, the fixing pin 7 is provided with a flange portion 7a on the base end side, and an insertion hole 7b into which a spring pressure locking stopper 8 is inserted is formed on the peripheral surface on the tip end side. It is penetrating.

  The stopper 8 has one end of a U-shaped pin recessed in a wave shape, and when the other end of the pin is inserted into the insertion hole 7b, as shown in FIG. Thus, the peripheral surface of the fixing pin 7 is held. The stopper 8 and the fixing pin 7 are connected via a wire 9.

  As shown in FIGS. 1 and 2, the other opening end of the stroke pipe 1b is inserted into the main pipe 1a from the other opening end side of the main pipe 1a, and the pin insertion holes 6 are aligned with each other. The fixing jig 7 is inserted into the pipe jig 1 and the pipe jig 1 maintaining a predetermined length is arranged in the hand hole H.

  In the pipe jig 1 arranged in the hand hole H, as shown in FIG. 4, the lock nut 4 on the main pipe 1a side is rotated using a ratchet type torque wrench L so that the adjuster bolt 2 is moved outward. Feed the screw toward. Similarly, the locking nut 4 on the stroke pipe 1b side is rotated using the ratchet type torque wrench L, and the adjuster bolt 2 is screw-fed toward the outside.

  As a result, as shown in FIG. 7, the crimping part 2a of the adjuster bolt 2 on the main pipe 1a side and the crimping part 2a of the adjuster bolt 2 on the stroke pipe 1b side are strongly pressed against the inner wall surface of the hand hole H, 1 is fixed in a stretched state with respect to the inner wall surface of the handhole H.

  In addition, as the fall prevention member 11 attached between the two pipe jigs 1, for example, as shown in FIG. 8, a long protective belt made of Kevlar fiber is employed. A hook-and-loop fastener portion 11a is attached to both ends of the protective belt, and can be connected to each other.

  Then, as shown in FIG. 8, after fixing the two pipe jigs 1 in the hand hole H, a protective belt is wound around the two pipe jigs 1 and is passed through the hook-and-loop fastener portion 11a. Connect both ends of the protective belt. Two protective belts are attached to the two pipe jigs 1 at a predetermined interval.

  Further, as the fall prevention member 11, for example, as shown in FIG. 9, a rectangular / planar protective net made of Kevlar fiber may be employed. On both sides of the protective net, reinforcing edge portions 12 having a plurality of hook hole portions 12a are provided. The reinforcing edge portion 12 adjusts the length of the protective net using the hook hole portion 12a.

  Then, after fixing the two pipe jigs 1 in the hand holes H, both ends of the protective net are wound around the respective pipe jigs 1 so as to be bridged over the two pipe jigs 1, and the reinforcing edges 12 arbitrary hook hole portions 12a are aligned in the vertical direction, and spring hooks 13 are attached to both hook hole portions 12a, and both end portions of the protective net wound around the two pipe jigs 1 are fixed. .

  Next, an example of assembly and use of the handhole lid fall prevention device configured as described above will be described.

  First, as shown in FIG. 1 and FIG. 2, the other opening end of the stroke pipe 1b is inserted into the main pipe 1a from the other opening end side of the main pipe 1a, and the pin insertion holes 6 coincide with each other. A fixing pin 7 is inserted into the pipe jig 1 to form a pipe jig 1 that maintains a predetermined length.

  Two pipe jigs 1 maintaining this predetermined length are prepared.

  After the two pipe jigs 1 are brought into the hand hole H, as shown in FIG. 4, the lock nut 4 on the main pipe 1a side is rotated using a ratchet type torque wrench L to adjust bolts. Screw 2 toward the outside. Similarly, the locking nut 4 on the stroke pipe 1b side is rotated using the ratchet type torque wrench L, and the adjuster bolt 2 is screw-fed toward the outside.

  As a result, as shown in FIGS. 7 and 8, the crimping portion 2a of the adjuster bolt 2 on the main pipe 1a side and the crimping portion 2a of the adjuster bolt 2 on the stroke pipe 1b side are strongly pressed against the inner wall surface of the handhole H. Two pipe jigs 1 are stretched and fixed to the inner wall surface of the handhole H.

  At this time, as shown in FIGS. 5A to 5C, the rotation prevention nuts 5 of the two bolts screwed to the adjuster bolt 2 are fastened to the adjuster bolt screwing nut portion 3 side. . Thereby, rotation that the adjuster bolt 2 moves inward is prevented, and loosening of the tension state with respect to the inner wall surface of the handhole H is prevented.

  Specifically, the crimping portion 2a of the adjuster bolt 2 attached to the adjuster bolt screwing nut portion 3 of the main pipe 1a is strongly pressed against the inner wall surface of the hand hole H, and the pipe jig 1 is brought into contact with the inner wall surface of the hand hole H. On the other hand, in a state of being fixed in a tension state, as shown in FIGS. 5A and 5B, the rotation prevention nut 5 of one bolt located on the adjuster bolt screwing nut portion 3 side is provided. Rotate and firmly apply to the side surface of the adjuster bolt screwing nut portion 3.

  Next, as shown in FIG. 5 (c), the rotation prevention nut 5 of the other bolt is rotated so as to be strongly applied to the side surface of the rotation prevention nut 5 of the one bolt.

  Similarly, the crimping part 2a of the adjuster bolt 2 attached to the adjuster bolt screwing nut part 3 of the stroke pipe 1b is strongly pressed against the inner wall surface of the hand hole H, so that the pipe jig 1 is against the inner wall surface of the hand hole H. In the state of being fixed in a tension state, the nut 5 for preventing rotation of one bolt located on the side of the adjuster bolt screwing nut portion 3 is rotated so that the side face of the adjuster bolt screwing nut portion 3 is strong. Hit it.

  Next, the rotation prevention nut 5 of the other bolt is rotated so as to be strongly applied to the side surface of the rotation prevention nut 5 of the one bolt.

  Then, as shown in FIG. 8, after fixing the two pipe jigs 1 in the hand hole H, two protective belts are wound around the two pipe jigs 1, Connect both ends of the protective belt through 11a. In this way, two protective belts are attached to the two pipe jigs 1 at a predetermined interval.

  Further, when a protective net is used as the fall prevention member 11, as shown in FIG. 9, the two pipe jigs 1 are fixed in the handhole H and then spanned over the two pipe jigs 1. Two ends of the protective net are wound around the respective pipe jigs 1, the arbitrary hook hole portions 12a of the reinforcing edge portion 12 are aligned in the vertical direction, and the spring hooks 13 are attached to the both hook hole portions 12a. Both ends of the protective net wound around the pipe jig 1 are fixed.

  The present invention is not only used for preventing the occurrence of an accident in which the handhole lid falls into the handhole, but also, for example, in construction in a vertical hole such as a steel tower of an elevated wire, a tunnel or an elevator. It can be widely used as an apparatus for preventing heavy objects from falling.

H ... Hand hole L ... Ratchet type torque wrench 1 ... Pipe jig 1a ... Main pipe 1b ... Stroke pipe 2 ... Adjuster bolt 2a ... Crimping part 3 ... Adjuster bolt screwing nut part 4 ... Locking nut 5 ... Rotating bolt Nut for prevention 6 ... Pin insertion hole 7 ... Fixed pin 7a ... Flange 7b ... Insertion hole 8 ... Stopper 9 ... Wire 10 ... Grip part 11 ... Fall prevention member (protective belt / protective net)
11a ... Hook fastener 12 ... Reinforcement edge 12a ... Hook hole 13 ... Spring hook

Claims (6)

  There are two pipe jigs, each of which has a main pipe that has a plurality of adjuster bolts attached to each end and a stroke pipe that can be adjusted in length, and a fall prevention member is attached between the two pipe jigs. A fall prevention device for a handhole lid, characterized in that.   2. The handhole cover fall prevention device according to claim 1, wherein the adjuster bolt includes a crimping portion at an end thereof.   A plurality of adjuster bolt screwing nut portions are provided at respective ends of the main pipe and the stroke pipe, and a plurality of adjuster bolts are attached via the plurality of adjuster bolt screwing nut portions. The fall prevention device of the handhole cover as described.   The three adjuster bolt screwing nut parts are provided at the respective ends of the main pipe and the stroke pipe, and the three adjuster bolts are attached via the three adjuster bolt screwing nut parts. The fall prevention device for a handhole cover according to any one of claims 1 to 3.   The main pipe and the stroke pipe are connected via a length adjusting portion, and the length adjusting portion corresponds to the plurality of pin insertion holes provided along the longitudinal direction of the main pipe and the pin insertion holes. And a plurality of pin insertion holes provided along the longitudinal direction of the stroke pipe, wherein the stroke pipe is inserted into the main pipe, and the fixing pin is inserted into both pin insertion holes that match each other. Item 5. The handhole cover fall prevention device according to any one of Items 1 to 4.   The fall prevention device for a handhole cover according to any one of claims 1 to 5, wherein the fall prevention member is a protection belt or a protection net made of Kevlar fiber.

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