JP3166620U - Fall prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention device which can be easily inserted from a manhole opening in advance and can be easily enlarged and attached along the inner diameter of a straight wall before repairing a slanted wall of a manhole. provide. A fall prevention device according to the present invention is a fall prevention device that is detachably attached to an inner wall of a hole such as a manhole, and is formed in an arc shape with an outer arc abutting along the inner wall. One frame and the second frame, two telescopic members rotatably connecting the first frame and the second frame with their inner arcs facing each other, and predetermined positions of the first frame and the second frame. It is a fall prevention device that has a locking portion to which a falling object storage body is attached, and presses the outer arcs of the first frame and the second frame against the inner wall by extending the telescopic member to fix it. [Selection diagram] Fig. 1

Description

  The present invention relates to a fall prevention device attached to the inner wall of a hole, and in particular, a fall prevention device effective for preventing the fall of excavated debris, crushed stone, earth and sand, tools, etc. into the manhole during construction around the manhole such as manhole repair work. About.

  In recent years, manholes installed on paved road surfaces and the like are generally assembled. The assembly type manhole has a structure as shown in, for example, Japanese Patent Laid-Open No. 6-228981. As shown in FIG. 9, such a manhole has a bottom plate 91, a buried pipe mounting wall 92, a straight wall 93, and a slant wall 94. Then, each concrete member of the manhole such as the adjusting ring 95 is assembled and buried at a predetermined depth. A receiving frame 96 and a lid 97 are placed thereon to form part of the road surface. Manholes and the surrounding pavement surfaces are prone to deterioration such as depression, subsidence, cracking, or breakage due to the influence of vibration of the traveling vehicle or aging, and repair work is required. There are various repair work, such as excavation of concrete and asphalt on paved roads, repair and replacement of manhole repair points, and backfilling. The manhole cover is opened. Therefore, if excavated debris, crushed stones, earth and sand, etc. fall on the bottom of an open manhole, dredging work is required on the bottom of the pipe, and even if tools fall during repair work, they cannot be picked up immediately. There are inconveniences such as. Especially in the construction around manholes, because work is stopped while people and vehicles are stopped, it is necessary to complete the work promptly to recover the traffic, and delaying the work due to dredging work at the bottom of the pipe is a major problem. It has become.

  For this reason, various devices have been developed for preventing excavation debris, crushed stone, earth and sand, tools and the like from falling to the manhole tube bottom. For example, in Japanese Patent Application Laid-Open No. 2005-213833, “a plate-shaped fall prevention unit that closes an opening of a manhole, and a ladder stage that is arranged at the bottom of the fall prevention unit and arranged on the inner peripheral wall of the opening of the manhole. One or more locking portions that are locked to each other, and one end pivotally pivoted to the bottom of the fall prevention portion, and the other end abutment portion is brought into contact with the inner peripheral wall of the opening of the manhole. Disclosed is a fall prevention device for manhole repair work, comprising: a pivot support leg for supporting; and a lifting member having one end connected to the pivot support leg and lifting the pivot support leg. (Patent Document 1).

  In addition, Japanese Utility Model Laid-Open No. 2-50443 has a “cylindrical part that is cut and separated so that the diameter can be reduced and enlarged, and is positioned concentrically within the cylindrical body and positioned at the neck of the manhole. A diameter adjusting member having a plurality of screwed portions, a plurality of adjusting screw rods arranged along the radial direction in the cylinder, one end screwed into the screwed portion, and the other end rotatably attached to the cylinder. And a manhole fall prevention device including a protective bag attached to a cylinder and reinforced with a wire mesh and receiving a height setting material that falls (Patent Document 2).

JP-A-2005-213834 Japanese Utility Model Publication No. 02-050443

  However, the fall prevention device disclosed in Patent Document 1 uses a plate-like fall prevention unit that closes the manhole opening, and in the case of repairing the slant wall 94 of the manhole, Although it is necessary to install a fall prevention device on the straight wall 93 portion of the manhole, since the inner diameter of the straight wall 93 is larger than the inner diameter of the manhole opening, a plate-shaped drop prevention that closes the straight wall 93 in advance before repair work There is a problem that the portion cannot be inserted from the manhole opening.

  Moreover, although the fall prevention apparatus disclosed by patent document 2 has the diameter adjustment member which can be diameter-reduced and expanded, the tube bottom of the manhole of the height setting material used in order to set the height of a receiving frame in the first place This is a device that prevents falling to the inner diameter of the manhole opening, and is a diameter adjustment member that fits the inner diameter of the manhole opening. Has an impossible structure.

  Therefore, the present invention has been made to solve the above-described problems, and can be easily inserted in advance from a manhole opening before repairing a slanted wall, etc. It aims at providing the fall prevention instrument which can be expanded and attached easily along an internal diameter.

  A fall prevention device according to the present invention is a fall prevention device that is detachably attached to an inner wall of a hole such as a manhole, and includes a first frame formed in an arc shape in which an outer arc abuts along the inner wall, and a first frame. Two frames, two telescopic members that connect the first frame and the second frame in a state where their inner arcs are opposed to each other, and a fallen object stored in a predetermined position of the first frame and the second frame And a locking portion to which the body is attached, and a fall prevention device that presses and fixes the outer arcs of the first frame and the second frame against the inner wall by extending the elastic member.

  Moreover, as one aspect of the present invention, it is preferable that the first frame and the second frame are connected so as to be rotatable in the horizontal direction.

  Furthermore, as one aspect of the present invention, it is preferable that the first frame and the second frame are formed in a subarc shape.

  In addition, as one aspect of the present invention, of the two elastic members, one elastic member is connected to the end of the first frame and a position on the inner peripheral surface of the second frame, and the other elastic member is the first elastic member. It is preferable that it is connected to the position on the inner peripheral surface of one frame and the end of the second frame.

  As described above, according to the fall prevention device of the present invention, it can be easily inserted in advance from the manhole opening before repairing the slanted wall of the manhole, and easily expanded along the inner diameter of the straight wall. It can be attached with a diameter, and it is possible to prevent earth and sand and tools from falling from the manhole.

It is a perspective view showing one embodiment of a fall prevention instrument concerning the present invention. (A) is a perspective view which shows the state which rotated the fall prevention instrument of this embodiment to the horizontal direction, (b) is the top view. It is a top view which shows the fall prevention instrument of this embodiment. It is a bottom view which shows the fall prevention instrument of this embodiment. It is a side view which shows the fall prevention instrument of this embodiment. It is sectional drawing in the AA of FIG. It is sectional drawing which shows the use condition of the fall prevention instrument of this embodiment. It is sectional drawing which shows the use condition of the fall prevention instrument of this embodiment. It is sectional drawing for demonstrating the structure of an assembly manhole.

  Hereinafter, the fall prevention instrument 1 which concerns on this invention is demonstrated using drawing.

  The fall prevention device 1 according to the present invention is a device for preventing excavation debris, crushed stones, earth and sand, tools and the like from falling to the manhole tube bottom, and as shown in FIG. The first frame 2 and the second frame 3, and the two elastic members 4 and 5 that connect the first frame 2 and the second frame 3.

  In this embodiment, as shown in FIGS. 2 (a) and 2 (b), the first frame 2 and the second frame 3 are rotated in the horizontal direction to reduce the width of the fall prevention device 1 to the opening of the manhole. After being inserted through the opening of the manhole in a state of being smaller than the portion and returning to a circular shape at a position below the slanted wall 94, the elastic members 4, 5 are stretched to extend to the inner peripheral surface of the straight wall 93. On the other hand, the first frame 2 and the second frame 3 are abutted and pressed in the horizontal direction to apply tension and are used in a fixed state.

  Hereinafter, each structure of the fall prevention instrument 1 which concerns on this invention is demonstrated in detail.

  Since the first frame 2 and the second frame 3 are fixed along the outer wall along the inner wall of the manhole, the first frame 2 and the second frame 3 are formed in an arc shape in accordance with the inner wall as shown in FIG. The outer diameter of the fall prevention device 1 in a state where the inner arcs of the first frame 2 and the second frame 3 face each other and are arranged in a circular shape is approximately the same as the inner diameter of the straight wall of the manhole. Is formed.

  As shown in FIG. 4, the two elastic members 4, 5 that connect the first frame 2 and the second frame 3 to each other are rotatable. The telescopic member 5 is connected to a position on the inner peripheral surface of the second frame 3 and an end portion of the first frame 2. The first frame 2 and the second frame 3 are connected to the telescopic members 4 and 5 so as to be rotatable, but the rotation direction is in the direction of gravity due to the weight of the falling object container 9 when attached to the manhole. Considering that a force is applied, it is practically preferable that both the frames 2 and 3 can be rotated in the horizontal direction. However, the rotation is not limited to such a horizontal rotation, and can be rotated in the vertical direction or the rotation direction as long as the width of the fall prevention device 1 can be reduced to the extent that it can be inserted from the manhole opening. A movable configuration may be adopted. In this embodiment, turnbuckles are used as the elastic members 4 and 5. However, the members are not limited to turnbuckles as long as the members can adjust the tension between the two frames by expanding and contracting. These members may be adopted.

  In the present embodiment, it is preferable that the first frame 2 and the second frame 3 are formed in an inferior arc shape. In the case of the inferior arc shape, when both the frames 2 and 3 are arranged in a circular shape, a gap is created between the ends of both frames as shown in FIGS. Due to the presence of this gap, the telescopic members 4 and 5 can be shrunk until the ends of both the frames 2 and 3 are close to or in contact with each other. As a result, the outer diameter when the fall prevention device 1 is made substantially circular can be made smaller than the inner diameter of the inner wall of the manhole. Therefore, even if the fall prevention device 1 has a certain thickness, it rotates within the manhole. And can be deformed. In addition, the inner diameter accuracy of the manhole has some variation, and there is an advantage that it can be used without being affected by the variation. In the present embodiment, the first frame 2 and the second frame 3 are formed in an inferior arc shape, but are not limited to the inferior arc as long as they are arcuate.

  Further, in the present embodiment, the first frame 2 and the second frame 3 are, as shown in FIGS. 1 and 2 (a), an L-shaped longitudinal section composed of side members 2a, 3a and upper surface members 2b, 3b. Is formed. The fall prevention device 1 according to the present invention has a structure in which a tension is fixed to the inner wall of a manhole by both frames 2 and 3, and the frames 2 and 3 are required to have high rigidity. By forming the frame, the rigidity can be increased as compared with the case where the frames 2 and 3 are simply made of a plate-like metal. Further, when the fallen object storage body 9 for storing the fallen object in the manhole is attached to the fall prevention device 1, a gap is formed between the inner wall of the manhole and the fallen object storage body 9, so that the upper surface members of the frames 2 and 3 2b and 3b also play a role of a lid for preventing a drop from the gap. The details of the falling object container 9 will be described later.

  Further, in the present embodiment, the upper surface members 2b and 3b of the first frame 2 and the second frame 3 are provided with notches 6 at positions that divide the frames 2 and 3 into about three equal parts as shown in FIG. Are provided in two places. This is a device for facilitating the close contact along the inner wall of the manhole when the outer arcs of the frames 2 and 3 are fixed to the inner wall of the manhole. In the present embodiment, the notches 6 are provided at two equal intervals in each of the frames 2 and 3, but the number and interval are not limited to this and may be appropriately selected and adopted.

  In addition, in this embodiment, the upper and lower members 2b and 3b of the first frame 2 and the second frame 3 are connected to the elastic members 4 and 5 among the end portions of both the frames 2 and 3, as shown in FIG. One suspension hole 7 is provided at each end portion that is not provided. This is a hole through which the rope is passed when the fall prevention device 1 is suspended from the manhole opening and inserted, so that either the first frame 2 or the second frame 3 can be used on the upper side. Both frames 2 and 3 are provided with suspension holes 7.

  In the present embodiment, the side members 2a, 3a and the upper surface members 2b, 3b of the first frame 2 and the second frame 3 are substantially L-shaped as shown in FIGS. Two stop portions 8 are provided. As shown in FIG. 7, these locking portions 8 engage a handle 10 of a fallen object storage body 9 that is attached to the fall prevention device 1 according to the present invention and that stores fallen objects into a manhole by means of an attachment member 11. It is used to stop. In the present embodiment, a flexible container bag is used as the fallen object storage body 9, but the present invention is not limited to this as long as the bag body can withstand the weight of excavated waste, crushed stone, earth and sand, and the like. Moreover, although the carabiner is used as the attachment member 11 for attaching the handle 10 of the fallen object storage body 9 to the locking portion 8, if the handle 10 can be locked to the locking portion 8, It is not limited.

  Further, as shown in FIG. 8, urethane formed in a donut shape on the upper side of the upper surface members 2b and 3b of the first frame 2 and the second frame 3 is longer in the width direction than the upper surface members 2b and 3b. A foam-type foamable resin 12 or the like can also be used. Thereby, it is possible to guide the fallen object from the outside to the manhole to be stored in the fallen object storage body 9 without leakage, and it is possible to buffer the impact of the fallen object on the fall prevention device 1.

  Moreover, you may attach the anti-slip | skid member which raises the frictional force with the inner wall of a manhole, and has a non-slip | skid function to the outer-arc side of the side members 2a and 3a of the 1st frame 2 and the 2nd frame 3.

As described above, according to the present invention, the following operational effects can be achieved.
1. It can be easily inserted in advance from the manhole opening before repairing the slant wall of the manhole, etc., and it can be easily expanded to fit along the inner diameter of the straight wall, so it can be easily dropped by simple installation work. The prevention effect can be exhibited.
2. In particular, manhole construction on roads, etc. hinders the passage of people and vehicles, so it is necessary to complete the construction as quickly as possible and to prevent gravel and tools from falling. A great effect is obtained in that the time for removing gravel dropped on the bottom of the manhole is unnecessary.
3. In addition to gravel, tools, etc., when an operator accidentally falls, it can be temporarily held, so that work safety can be enhanced.

  In this embodiment, the case where the fall prevention device 1 according to the present invention is installed on the inner wall of a manhole has been described as an example. However, the present invention is not limited to application to a manhole. The present invention can also be applied to various tanks such as water storage tanks and inner walls of holes such as steel towers and advertisement tower holes.

DESCRIPTION OF SYMBOLS 1 Fall prevention instrument 2 1st frame 2a 1st frame side surface member 2b 1st frame upper surface member 3 2nd frame 3a 2nd frame side surface member 3b 2nd frame upper surface member 4, 5 Elastic member 6 Notch part 7 Hanging Hole 8 Locking part 9 Falling object container 10 Handle 11 Mounting member 12 Urethane foam type foamable resin 91 Bottom plate 92 Buried pipe mounting wall 93 Straight wall 94 Slanting wall 95 Adjusting ring 96 Receiving frame 97 Lid

Claims (4)

A fall prevention device detachably attached to the inner wall of a hole such as a manhole,
A first frame and a second frame formed in an arc shape in which an outer arc abuts along the inner wall;
Two telescopic members that connect the first frame and the second frame so that the inner arcs face each other in a rotatable manner;
A locking portion to which a fallen object storage body is attached at a predetermined position of the first frame and the second frame;
An anti-falling instrument that fixes the outer arc of the first frame and the second frame against the inner wall by extending the elastic member.   The fall prevention instrument according to claim 1, wherein the first frame and the second frame are connected so as to be rotatable in a horizontal direction.   The fall prevention instrument according to claim 1 or 2, wherein the first frame and the second frame are formed in an inferior arc shape.   Of the two elastic members, one elastic member is connected to an end of the first frame and a position on the inner peripheral surface of the second frame, and the other elastic member is an inner periphery of the first frame. The fall prevention instrument according to any one of claims 1 to 3, wherein the fall prevention instrument is connected to a position on a surface and an end of the second frame.

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