JP3134075U - Fall prevention fence for square opening - Google Patents

Abstract

To provide a fall prevention fence for a square opening that can be easily attached to a square opening and cannot be easily removed after the attachment.
A fall prevention fence A includes a column C standing at four corners of a rectangular opening H, a strut member B attached between columns C standing at opposite edges of the square opening H, and a column C. The column C has a column base C1 at the lower end, and the column base C1 can be locked to the side edge of the square opening H at one side of the lower end. The strut member B has a hook-shaped locking portion 5a, has a plate at both ends, can be expanded and contracted in the longitudinal direction by a screw mechanism, When the plate body is applied and extended by the screw mechanism, the cross-sectional saddle-type locking portion 5a of each column base C1 is in pressure contact with the side edge of the square opening H, and the single pipe D is orthogonally clamped to each column C. It was set as the structure attached detachably by E.
[Selection] Figure 1

Description

  This device is mainly used for manholes, handholes, CCBOX (abbreviations such as Community Cable Box, Communication Cable Box or Compact Cable Box, etc. It is related with the fall prevention fence for preventing the fall in the opening part of an operator, a pedestrian, etc., when opening the lid | cover of opening parts.

  Conventionally, the road surface has been provided with openings such as manholes, handholes, CCBOXs, etc. to maintain water, electricity, gas, etc. buried in the ground, and these openings are usually sturdy. A lid is put on.

  When opening the lid in these manholes, etc., to prevent workers or pedestrians from accidentally falling into the opening, including the meaning of alerting, the fall prevention material around the opening or its surroundings Is installed. In the case of a fall prevention fence such as a manhole which is a round opening, the lower end of the fence is fitted and fixed to the opening edge step of the manhole, or the lid or floor board adjacent to the part where some lids or floor boards are opened The side edge of the fence is fixed across the bottom edge of the fence, but especially in the case of a square opening such as a hand hole, there are no places where it can be fixed, and the size of the opening varies and is difficult to fix. Met. Therefore, in the case of a hand hole or the like having a rectangular opening, a so-called A-type barricade is erected around the opening to surround the opening.

On the other hand, as in Patent Document 1, for a fall prevention fence of a quadrilateral opening such as a manhole, four frames that are foldably connected by a quadrilateral and a pair of frames that are opposed to each other among these frames The thing which provided the manhole engagement member which attaches to the lower part of a body so that rotation is possible and engages in a manhole is developed.
JP 2001-11879 A

  However, the A-type varieties easily move when a load in the horizontal direction is applied, which is not sufficient as a protective fence, and in some cases, the A-type variate itself may fall into the opening. It was dangerous. Further, in the case of A-type barricade, since the periphery of the opening is largely surrounded (approximately 50 cm or more), the work zone is widened by the width, and it is difficult to secure a pedestrian passage on a narrow sidewalk.

  In addition, in order to reduce the work zone, even if the lower end of the guard fence is fitted inside the opening, the inner part of the opening is not located in the area immediately below the opening edge regardless of the shape of the opening. A step frame for locking the lid is provided by this, and a key member or the like for locking the lid protrudes on the inner surface forming the step portion. The length from the upper edge to the upper edge is only about 50 mm, and it was difficult to install protective fences at these places.

  In addition, the sizes and standards of the openings for manholes, hand holes, etc. for water, electricity, gas, etc. are determined by the local governments for water supplies, etc. The sizes, etc., for electricity, gas, etc. are also determined by each company. It has been. Therefore, manufacturing a fall protection fence suitable for the size of each opening or the like requires a lot of labor and cost.

  Furthermore, in the thing of the said patent document 1, it is a simple structure which just engaged the right-angle shaped manhole engaging member with the edge of a quadrilateral manhole etc., and when a horizontal load is applied It ’s also possible to come off easily. This is not enough as a fall prevention fence.

  Therefore, in view of these points, the present invention can be easily applied to the inner surface of the edge of the opening even if it is a rectangular opening such as a hand hole, or even if this opening has various sizes and standards. It is possible to provide a fall-preventing fence for a rectangular opening that cannot be easily detached after being attached.

  The invention according to claim 1 is the fall prevention fence attached to the periphery of the square opening part opened on the road surface or the floor surface, and the fall prevention fence is a relative of the pillars standing at the four corners of the square opening part and the square opening part. It consists of a strut member attached between the pillars erected on the opposite side edge, and a cross member detachably attached between the pillars, and the pillar has a pillar base at the lower end, and the pillar base is on one side of the lower end In addition, it has a hook-shaped cross-section locking portion that can be locked to the side edge of the rectangular opening.

  In addition, the tension member has plate bodies at both ends, and can be expanded and contracted in the longitudinal direction by a screw mechanism, and the plate body is applied to the vertical plates provided at the respective bases of the struts facing each other by the screw mechanism. The rectangular opening portion is configured such that, when extended, the cross-sectional hook type locking portion of each column base is pressed against the side edge of the square opening, and the cross member is detachably attached to each column by fixing means. A fall prevention fence was used.

  The invention according to claim 2 is for a rectangular opening according to claim 1, wherein a rubber body having a substantially right-angled triangle shape protruding downward is attached to the back surface of the vertical plate of the cross-sectional saddle type locking portion of the support base. A fall prevention fence was used.

  The invention according to claim 3 is the fall-preventing fence for the square opening according to claim 1 or 2, wherein the four side surfaces or the top surface formed by the columns and the cross members are covered with a sheet. .

  According to the first, second, and third aspects of the invention, since it is fixed in a state where it is hung on the upper part of the receiving frame that is the inner edge of the opening, there are various sizes and standards of the opening as long as it is a rectangular opening. It can be installed even if crossed over. In addition, even if a key member protrudes inward from the receiving frame inside the opening, it is possible to lock the cross-sectional hook type locking part of the column base in a short distance from the key member to the upper edge. High nature. In addition, since a large work zone is not spread around the opening, it is easy to secure a walking space for pedestrians and the like, and there is little feeling of pressure. Therefore, it has little influence on the surrounding environment and is environmentally friendly.

  In addition, the fall prevention fence itself can firmly fix the lower end of the column to the opening edge and the horizontal member to the column, so even if a horizontal load is applied, the column will fall or the horizontal member will fall off. It is safe. Furthermore, when installing the fall prevention fence in the opening, after fixing the two struts and the tension member together, if the extension member is extended assuming the dimensions of the opening to be installed in advance, When the member and the two struts are locked to the receiving frame of the opening, the strut member and the two struts are self-supporting, and one worker can easily install the fall prevention fence, which is extremely easy to use. It ’s good. Furthermore, since each part which comprises this fall prevention fence can be decomposed | disassembled into a tension member, a support | pillar, a cross member, etc., carrying around is also convenient.

  According to the invention of claim 2, in addition to the above effect, a rubber body having a substantially right triangle shape protruding downward is attached to the vertical plate back surface of the cross-sectional saddle type locking portion of the support base, and the tension member When the vertical plate of the column base is pressed by the plates at both ends of the column, the column base is difficult to come off from each edge of the rectangular opening due to the repulsion and frictional force of the rubber body. It is rich in nature and can be used with confidence.

  In the fall prevention fence that is attached around the square opening that opens on the road surface or floor, the fall prevention fence stands on the four corners of the square opening and the opposite side edges of the square opening. A strut member attached between the struts and a cross member detachably attached between the struts, the strut has a strut base at the lower end, and the strut base is on one side of the lower end of the rectangular opening. The side edge has a hook-shaped locking section that can be locked on the side edge.

  In addition, the tension member has plate bodies at both ends, and can be expanded and contracted in the longitudinal direction by a screw mechanism, and the plate body is applied to the vertical plates provided at the respective bases of the struts facing each other by the screw mechanism. When stretched, the cross-sectional hook-type locking portion of each column base is configured to press against the side edge of the rectangular opening, and the cross member is configured to be detachably attached to each column by a fixing means. As a result, a rectangular opening can be installed even if the size and standards of the opening vary.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a state in which a fall prevention fence for a rectangular opening (hereinafter referred to as “fall prevention fence”) according to the present invention is installed in a square opening. FIG. 2 is a front view of a state in which the fall prevention fence according to the present invention is installed in a rectangular opening, and FIG. 3 is a plan view of the same.

  As shown in these figures, the fall prevention fence A is installed so as to surround the quadrangular opening H, and the four struts C that lock the base at both ends of the opposite side edges of the quadrangular opening H. And a strut member B that presses the two struts C locked to the opposite side edges against each side edge, and a single pipe D that passes between the four struts C. Each single pipe D is detachably attached to each column C by an orthogonal clamp E (see FIGS. 1 and 2).

First, the tension member B will be described.
FIG. 4 is a plan view of a tension member of the fall prevention fence according to the present invention. FIG. 5 is a front view of the same. FIG. 6 is a side view of the outer cylinder side of the strut member of the fall prevention fence of the present invention. FIG. 7 is a side view of the inner cylinder side.

  As shown in FIGS. 3, 4, 5, 6 and 7, one opening portion of a fixed length cylinder is closed with the central portion of a square plate body 2a, and the outer tube 2 is fixed by fixing the plate body. Provide. Further, a screw hole penetrating to the inside is provided on the outer peripheral surface near the other opening of the outer cylinder 2, and a substantially key-shaped stopper 1 is screwed into the screw hole from the outside. Further, the outer peripheral surface of a cylinder having a diameter smaller than that of the outer cylinder 2 is threaded, one opening of the cylinder is closed with a central portion of a square plate body 3a, and the plate body 3a is fixed to provide the inner cylinder 3. . Here, the size of the plate 2a of the outer cylinder 2 and the size of the plate 3a of the inner cylinder 3 are substantially the same, and two through-holes 2b and 3b are arranged in parallel at an upper portion.

  Further, the tension member B is provided with a rotation fastening body 4 having a substantially cross shape. The base 4a of the rotary tightening body 4 has a substantially annular shape having a constant width, and four protrusions 4b are provided on the outer peripheral surface at intervals of about 90 degrees, and the inner peripheral surface is threaded. The rotary fastening body 4 is screwed onto the threaded outer periphery of the inner cylinder 3 so as to be movable on the outer peripheral surface. The inner cylinder 3 is connected to the outer cylinder 2 from the other edge of the inner cylinder 3. The other member is inserted into the other opening to make the inner cylinder 3 extendable and contractable from the outer cylinder 2 to form a tension member B.

Then, the support | pillar C is demonstrated.
FIG. 8 is a partially omitted side view of the column C. FIG. FIG. 9 is a partial front view of the base of the column. FIG. 10 is a partial rear view of the base of the column. FIG. 11 is a plan view of the column C. FIG.

  As shown in FIGS. 8, 9, 10, and 11, the vertical plate 7 is fixed substantially perpendicularly to one end of the bottom plate 5 made of a horizontal plate, and the lower portion of the vertical plate 7 is suspended from one end of the bottom plate 5. Thus, a cross-sectional saddle-shaped locking portion 5 a is formed, and the upper portion of the vertical plate 7 protrudes upward from the upper surface of the bottom plate 5. Further, side plates 6 that cover both sides of the bottom plate 5 and the vertical plate 7 are provided, respectively, and one side lower end of the both side plates 6 is cut out along the cross-sectional saddle type locking portion 5a. Further, side edges of the side plate 6 protrude from both sides of the vertical plate 7, and a lower end edge plate 11 is provided at the lower end of the vertical plate 7 in accordance therewith. It has a shape with. The base plate C <b> 1 is formed by the above-described bottom plate 5, vertical plate 7, side plate 6, and lower end edge plate 11.

  A column C is formed by standing and fixing a fixed-length cylinder C2 on the bottom plate 5 of the column base C1. As shown in FIG. 8, a substantially right triangle-shaped rubber projecting downward on the back surface of the vertical plate 7 of the cross-sectional saddle-type locking portion 5a formed by the bottom plate 5 and the vertical plate 7 of the column base C1. The body 8 is attached in close contact with the long side, and the support column C is provided with a plurality of flanges 9 at regular intervals, and the vertical plate 7 is spaced 2 at the top. Two through holes 7a are arranged side by side. Further, ribs 10 are provided between both sides of the cylinder C2 on the bottom plate 5 of the support base C1 and the side plates 6.

  Next, as shown in FIGS. 1, 2, and 3, the fall prevention fence A is installed in the quadrangular opening H of the hand hole provided on the road surface using the tension member B, the support column C, and the like.

  First, two strut members B and four struts C are prepared. The plate 2a of the outer cylinder 2 of the tension member B and the plate 3a of the inner cylinder 3 are brought into contact with the vertical plates 7 of the column bases C1 of the two columns C, respectively, and the positions of the respective through holes 2b, 3b and 7a. And bolts through them, screwed with nuts to fix them together, and united (not shown). As a result, two sets of two struts C and one strut member B integrated are prepared. Then, the length of the tension member B is adjusted in advance according to the distance between the opposite side edges of the rectangular opening H. In these two sets of integral members B and struts C, the cross-sectional saddle-shaped locking portion 5a formed by the bottom plate 5 and the vertical plate 7 of the strut base C1 of each strut C is formed as a rectangular opening H. It latches at the both ends of one side edge which opposes each other.

  Then, one opening of a cylindrical operation tube 13 (see FIG. 5) provided separately is fitted into the protrusion 4b of the rotary fastening body 4 of the inner cylinder 3 of the tension member B, and this rotational fastening. The attachment body 4 is rotated to move on the inner cylinder 3 and the end of the outer cylinder 2 is pressed by the rotation fastening body 4. As a result, one end of the inner cylinder 3 is extended from the other opening of the outer cylinder 2 and the tension member B is stretched, and the column base 2 C of the outer cylinder 2 and the plate body 3 a of the inner cylinder 3 are used to support the column base C 1. The vertical plate 7 is pressed to press the cross-sectional hook type locking portion 5a against the four corners of the rectangular opening H, and the columns C are fixed upright.

  Then, two single pipes D are transferred to each of the four side surfaces formed by the columns C, and each column C is fixed using an orthogonal clamp E. In this manner, the fall prevention fence A is installed in the rectangular opening H.

  FIG. 12 is a partial cross-sectional view of a state in which the fall prevention fence A according to the embodiment of the present invention is installed in the rectangular opening H, and a roll curtain-like fall protection sheet F is attached to the side face.

  In this case, the base F1 of the roll curtain-shaped fall protection sheet F is attached to the upper single pipe D on three sides or each side formed by four upright columns C, and the lower single pipe D is reached. It can be pulled down and the lower end can be locked with a hook. Thereby, it can prevent more reliably that a pedestrian, an operator, or an article | item falls in an opening part.

  FIG. 13 shows a state in which the fall prevention fence A according to the embodiment of the present invention is installed in the rectangular opening H, and roll curtain-like fall protection sheets F are attached to the opposite side surfaces and the top surface. FIG. In this case, on the four side surfaces formed by the four standing columns C, a roll curtain-like fall protection sheet is provided on the lower single pipe D provided on one side surface among the one side surfaces facing each other. A base F1 of F is attached, and the fall protection sheet F is extended from this position to cover the top surface formed by each column C and each single pipe D and the single pipe D below the other side. it can. Thereby, even if it rains during the work, it is difficult for the rain to enter the opening, and the work is not interrupted.

  In addition, a rubber body 8 having a substantially right triangle shape is attached to the inside of the cross-sectional saddle-type locking portion 5a formed by the bottom plate 5 and the vertical plate 7 of the column base C1, and the taper increases as it goes downward. Therefore, when the vertical plate 7 of the column base C1 is pressed by the plate body 2a of the outer cylinder 2 and the plate body 3a of the inner cylinder 3 at both ends of the tension member B, the rubber bodies 8 are compressed into the rectangular shape. The lower the edge of the opening H, the stronger the pressure is applied, and the column base C1 is less likely to be detached from the edge of the rectangular opening H due to the repulsive force and frictional force. Therefore, even if a horizontal load is applied to the fall prevention fence A, each support column C does not easily float.

  In the above embodiment, the tension member B is attached to one opposite side of the rectangular opening H. Of course, the tension member B can be attached to each opposite side edge. In this case, as shown in FIG. 14, the plate members 2a and 3a at both ends of the tension member B located at one opposite position are compressed by the tension member B of the other opposite side piece attached first. It may be attached so that it is brought into contact with and pressed against the side plates 6 of the two pillars C.

  Further, as shown in FIG. 15, the plate 2a of the outer cylinder 2 or the plate 3a of the inner cylinder 3 of the two stretching members B, which are adjacently arranged at the corner of the rectangular opening H, are separately received. You may make it provide and attach the support | pillar base C3 which has the drooping board 12a hung perpendicularly | vertically from the right-angle inner edge of the provided bowl-shaped bottom board 12 mutually. At this time, in the plate body 2a of the outer cylinder 2 and the plate body 3a of the inner cylinder 3 of the tension member B, the outer cylinder 2 or the inner cylinder 3 is shifted to the upper or lower side from the center position of the plate bodies 2a and 3a. Use the one with the edge of the abutment fixed. Thereby, it is prevented that the outer cylinder 2 and the inner cylinder 3 which cross | intersect collide.

  Further, in this embodiment, the plate body 2a of the outer cylinder 2 and the plate body 3a of the inner cylinder 3 of the strut member B are previously brought into contact with the vertical plates 7 of the column bases C1 of the two columns C, and these are bolted. The nut is fixed to each of the nuts and is installed in the rectangular opening H by the integral tension member B and each support column C. However, the installation method is not limited to this, and other methods are also possible. Good.

  Furthermore, in FIGS. 1, 3, 12, and 13, which are views after installation in the rectangular opening H, the rotary fastening body 4 of the tension member B is located at a position away from the edge of the outer cylinder 2, Since the position of the inner cylinder 3 with respect to the outer cylinder 2 is fixed by a substantially key-shaped stopper 1 provided on the outer cylinder 2, the rotary tightening body 4 is moved to one side so as not to disturb the work. It is a thing. If the stopper 1 is not used, the rotary tightening body 4 is on the inner cylinder 3 and is in a position pressing the edge of the outer cylinder 2.

  The shape of the rotary tightening body 4 is not limited to a substantially cross-shaped shape, and the rotation tightening body 4 is not necessarily rotated by the operation tube 13 but may be another one or a method. In addition, the single pipe D is not limited to this, and may be an appropriate cross member. The fixing of the single pipe D to the column C is not necessarily performed by the orthogonal clamp E, and any other fixing means may be used. A substantially right-angled triangular rubber body is attached to the vertical cross-section hooking portion 5a formed by the bottom plate 5 and the vertical plate 7 of the column base C1, but the shape of the rubber body is limited to this. Any other shape may be used as long as it can prevent the installed fall prevention fence A from being pulled upward. Furthermore, this rubber body may not be attached.

  Moreover, in the said Example, although the fall prevention fence A was installed in the square opening H provided in the road surface, the fall prevention fence A is installed in the square opening H, such as a manhole, a handhole, and CCBOX. For example, it can be installed and used in a rectangular opening of an underground storage provided on an indoor floor board.

It is a partial cross section figure of the state which installed the fall prevention fence of the Example of this invention in the square opening part. It is a front view of the state which installed the fall prevention fence of the Example of this invention in the square opening part. It is a top view of the state which installed the fall prevention fence of the Example of this invention in the square opening part. It is a top view of the tension member of the fall prevention fence of the Example of this device. It is a front view of the tension member of the fall prevention fence of the Example of this device. It is a side view by the side of the outer cylinder of the strut member of the fall prevention fence of the Example of this invention. It is a side view by the side of the inner cylinder of the tension member of the fall prevention fence of the Example of this invention. It is a partially-omission side view of the column of the fall prevention fence of the Example of this device. It is a partial front view of the base of the column of the fall prevention fence of the example of this invention. It is a partial rear view of the base of the column of the fall prevention fence of the example of this invention. It is a top view of the support | pillar of the fall prevention fence of the Example of this invention. FIG. 4 is a partial cross-sectional view of a state in which the fall prevention fence according to the embodiment of the present invention is installed in a rectangular opening, and a roll curtain-like fall protection sheet is attached to a side surface. FIG. 3 is a partial cross-sectional view of a state in which a fall prevention fence according to an embodiment of the present invention is installed in a rectangular opening, and roll curtain-like fall protection sheets are attached to opposite side surfaces and a top surface. It is a perspective view of the state which attached the support | pillar base of the fall prevention fence of the other example of the Example of this invention to the corner of a square opening part. It is a perspective view of the state which attached the support | pillar base of the fall prevention fence of the other example of the Example of this invention to the corner of a square opening part.

Explanation of symbols

A Fall prevention fence B Strut member C Strut C1 Strut base C2 Cylindrical D Single pipe E Orthogonal clamp F Fall prevention sheet H Square opening 1 Stopper 2 Outer cylinder 2a Plate body 3 Inner cylinder 3a Plate body 4 Rotating clamp 5 Bottom plate 5a Cross-sectional saddle type locking portion 6 Side body 7 Vertical plate 8 Rubber body 9 Flange 10 Rib 11 Bottom edge plate
12 Bottom plate 13 Operation tube

Claims (3)

In the fall prevention fence attached around the square opening that opens on the road surface and floor,
The fall-preventing fence is composed of pillars erected at the four corners of the rectangular opening, a tension member attached between the pillars erected on opposite side edges of the rectangular opening, and a laterally attached detachably between the pillars. Consisting of materials,
The column has a column base at the lower end, and the column base has a cross-sectional saddle type locking unit that can be locked to the side edge of the rectangular opening on one side of the lower end,
The tension member has plate members at both ends, and is stretchable in the longitudinal direction by a screw mechanism. The plate member is stretched by a screw mechanism by applying the plate member to a vertical plate provided at each column base of the columns facing each other. At the time, the cross-sectional saddle-type locking portion of each column base is configured to press-contact the side edge of the rectangular opening,
4. A fall prevention fence for a rectangular opening, wherein the cross member is configured to be detachably attached to each column by a fixing means. The fall for a rectangular opening according to claim 1, wherein a rubber body having a substantially right triangular shape protruding downward is attached to the vertical plate back surface of the vertical hook-shaped locking section of the support base. Prevent fence. The fall prevention fence for a square opening according to any one of claims 1 and 2, wherein a sheet covers a side surface or a top surface formed by the columns and the cross members.