Temporary lid for hole

Abstract

To provide a new temporary lid for a hole which can be firmly adapted to holes of various sizes and shapes.SOLUTION: A temporary lid for a hole comprises: a circular lid body 10 larger than an opening H; a reinforcing frame 20 provided on a lower surface of the lid body 10 so as to be positioned within the opening H; and a sliding part 30 sliding radially outward from the reinforcing frame 20. The sliding part 30 is supported on the lower surface side of the lid body 10 by being screwed into a fastening bolt 31 which is inserted from an upper surface side of the lid body 10 through an elongated hole 11 formed in the lid body 10 so as to extend in a radial or width direction. This allows the sliding part 30 to be slid and brought into contact with an inner surface of the opening H, making it possible to be attached to holes of various sizes and shapes.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a temporary hole cover used to temporarily cover openings such as manhole openings installed mainly at construction sites and sidewalks, and handholes installed in buildings, apartment buildings, etc. [Background technology]

[0002] Conventionally, the openings (holes) of manholes and handholes (underground boxes) are closed with sturdy cast iron covers to prevent them from being easily opened by tampering or damaged when large vehicles pass through them. However, cast iron covers are heavy, so it is not easy to open and close them every time workers enter and exit the manhole or handhole frequently during inspection and cleaning work or construction work. For this reason, temporary covers made of lightweight materials are often used instead of the original sturdy and heavy cast iron covers until the work is completed.

[0003] For example, the following Patent Document 1 proposes a temporary manhole cover made of a steel plate about 5 mm thick, with an insertion hole for inserting an air duct and a light entrance hole for admitting external light. The following Patent Document 2 proposes a temporary manhole cover made of glass fiber reinforced plastic, with a ventilation duct hole, a cable introduction hole, and multiple light entrance holes. The following Patent Document 3 proposes a temporary manhole cover in which the main body of the temporary cover is made of a steel plate, and multiple through holes are further provided in the main body of the temporary cover, through which protrusions such as pins can be inserted, so that the temporary manhole cover can be adapted to the size of the manhole opening at the construction site. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-105789 A [Patent Document 2] JP 2008-202359 A [Patent Document 3] JP 2007-16510 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, the temporary manhole cover shown in Patent Document 3 mentioned above can be relatively easily adapted to the size of the manhole opening at the construction site by inserting a protrusion such as a pin into an appropriate through-hole. However, since a large number of through-holes must be formed in advance in the temporary cover body, there is a risk that a large amount of rainwater, mud, etc. will flow into the manhole through the many through-holes.

[0006] If this temporary cover is applied to hand holes (underground boxes) installed as a place for connecting and inspecting electric wires, cables, and electric conduits buried underground, there is a risk that rainwater, mud, etc. will flow into the hand holes (underground boxes) through the through holes and accumulate in large quantities inside. In addition, since the size can only be adjusted between pre-formed through holes, there is a possibility that a large amount of wobble will occur if the size does not match the size of the opening. Furthermore, if the through hole is made into an elongated hole as shown in Figure 5 of the same document, in order to fix a bolt at any position in the elongated hole, the bolt must be tightened while holding the nut on the back side with a spanner or wrench, and this adjustment work is not easy.

[0007] Therefore, the present invention has been devised to solve these problems, and its object is to provide a new temporary hole cover that can be easily attached to holes of various sizes and shapes, both large and small. [Means for solving the problem]

[0008] In order to solve the above problems, the first invention is a temporary lid for a hole that is placed over an opening to close it, comprising: a circular or rectangular lid body that is larger than the opening; a reinforcing frame provided on the underside of the lid body so as to be positioned within the opening; and a sliding part that slides radially outward or widthwise outward from the reinforcing frame to abut against the inner surface of the opening, wherein the sliding part is supported on the underside of the lid body by screwing onto a fastening bolt that is inserted from the top side of the lid body through a long hole formed in the lid body so as to extend radially or widthwise.

[0009] According to this configuration, the sliding part provided on the underside of the lid body together with the reinforcing frame can be slid radially outward or widthwise outward from the reinforcing frame to abut against the inner surface of the opening, making it easy to attach to holes of various sizes and shapes. After closing the opening with the lid body, the sliding part can be slid from the upper surface side of the lid body to easily adjust its position.

[0010] The second invention is the temporary hall cover according to claim 1, characterized in that a plurality of recesses into which the heads of the fastening bolts fit are formed along the edge of the elongated hole. With this configuration, even if the fastening bolts loosen slightly due to vibrations caused by cars passing by, the heads of the fastening bolts fit into the recesses, so the fastening bolts will not shift out of position.

[0011] The third invention is the temporary hole lid of the first invention, characterized in that the reinforcing frame extends from approximately the center of the lid body in a cross or Y shape. With this configuration, by providing the slide part at the tip of each reinforcing frame, the slide part can be abutted against the inner surface of the opening at a maximum of four or three points. This allows the lid body to be stably fitted into the hole.

[0012] The fourth invention is the temporary hole lid of the third invention, characterized in that the slide part is an I-shape or a T-shape extending in the radial or width direction of the lid body. With this configuration, the slide part can be abutted against the inner surface of the opening at at least four points or three or more points. This allows the lid body to be fitted into the hole more stably.

[0013] The fifth invention is a temporary hall cover according to any one of the first to fourth inventions, characterized in that the cover body is made of checkered steel plate. With this configuration, it is possible to achieve a significant weight reduction compared to conventional cast iron covers while maintaining the necessary strength, and also to exhibit a non-slip surface effect. Effect of the Invention

[0014] According to the temporary hole lid of the present invention, the sliding portion provided on the underside of the lid body together with the reinforcing frame can be slid radially outward or widthwise outward from the reinforcing frame to abut against the inner surface of the opening, thereby making it easy to attach to holes of various sizes and shapes. [Brief description of the drawings]

[0015] [Figure 1] 1 is a plan view showing an embodiment of a temporary hall cover 100 according to the present invention. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 2 is a partially enlarged view showing a portion S in FIG. [Figure 4] FIG. 3 is a partially enlarged view showing a portion S in FIG. [Diagram 5] 1 is a plan view showing an example in which the temporary hole cover 100 according to the present invention is applied to a small diameter opening H1. [Figure 6] 1 is a plan view showing an example in which the temporary hole cover 100 according to the present invention is applied to a large-diameter opening H2. FIG. [Figure 7]1 is a plan view showing an example in which the temporary hole cover 100 according to the present invention is applied to a rectangular opening H3. FIG. [Figure 8] 1 is a plan view showing another embodiment of the temporary cover 100 for a hall according to the present invention. FIG. [Figure 9] FIG. 9 is a partially enlarged view showing a portion S in FIG. [Figure 10] 1 is a plan view showing another embodiment of the temporary cover 100 for a hall according to the present invention. FIG. [Figure 11] 1 is a plan view showing another embodiment of the temporary cover 100 for a hall according to the present invention. FIG. [Figure 12] 13 is a plan view showing another embodiment of the lid-side long hole 11. FIG. [Figure 13] 13 is a cross-sectional view showing a fastening bolt 31 and its fixing nut 31b in the vicinity of the lid-side long hole 11. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a plan view showing one embodiment of a temporary hall cover 100 according to the present invention, and Fig. 2 is a cross-sectional view taken along line AA of Fig. 1. As shown in the figure, the temporary hall cover 100 is provided with a cross-shaped reinforcing frame 20 and four slide parts 30, 30, 30, 30 on the underside of a circular cover body 10.

[0017] The lid body 10 is made of a material that is lighter and has a suitable strength than conventional cast iron lids, such as a checkered steel plate with a non-slip protrusion on the surface (upper surface), and although there is no particular limit to its size, it is, for example, about 600 to 1000 mm in diameter and 5 to 10 mm in thickness. Although this lid body 10 is a flat plate, it may also be spherical with a gently rising center.

[0018] The reinforcing frame 20 is composed of a first frame 21 made of an angle steel having an L-shaped cross section, and a pair of second frames 22, 22 extending from the approximate center of the first frame 21 to the left and right, and is structured by connecting these in a cross shape. The second frames 22, 22 are also made of angle steel like the first frame 21. The reinforcing frame 20 is integrally connected to the lower surface side of the lid body 10 by welding or by connecting members such as bolts (not shown) so that their central portions are approximately aligned with each other. The vertical and horizontal lengths of the reinforcing frame 20 are shorter than the diameter of the lid body 10 (for example, shorter than the diameter of the lid body 10 by about 100 to 300 mm).

[0019] The slide parts 30, 30, 30, 30 are made of planar I-shaped angle steel with a length of, for example, about 150 to 200 mm, and can slide from both ends of the first frame 21 and the leading ends of the second frames 22, 22 constituting the reinforcing frame 20 toward the radially outer side of the lid body 10. Figures 3 and 4 are partial enlarged views showing the S parts in Figures 1 and 2, and show an example of the structure of the slide parts 30, 30, 30, 30. The slide parts 30, 30, 30, 30 all have the same structure.

[0020] As shown in the figure, the slide portion 30 is positioned parallel to the longitudinal direction of the first frame 21 and the second frame 22, 22 so as to contact the respective leading ends of the frames. A fastening bolt 31 extending from the upper side of an elongated hole 11 formed in the lid body 10 is screwed into the leading end of the slide portion 30, and an elongated hole 32 extending in the longitudinal direction of the slide portion 30 is formed in the rear end of the slide portion 30 so as to engage with a guide bolt 23 extending through the frames 21, 22, 22.

[0021] The temporary hole cover 100 of the present invention having such a configuration has slide sections 30, 30, 30, 30 provided at both ends of the first frame 21 and at each end of the second frame 22, 22 which are each capable of sliding independently in the radial direction of the cover body 10, and can therefore fit tightly (fit) to and close openings (holes) of various sizes and shapes.

[0022] That is, for example, when fitting a temporary hole cover 100 having a cover body 10 diameter of 800 mm to a small-diameter opening (hole) H1 having an inner diameter of 400 mm as shown in Fig. 5, the fastening bolt 31 engaged with the long hole 11 on the cover body 10 side is loosened and the fastening bolt 31 is moved along the long hole 11 to the rear end of the long hole 11 (the center side of the cover body 10) as shown in Fig. 3(B) and Fig. 4(B). Then, accompanying the movement of the fastening bolt 31, the sliding part 30 slides toward the center side of the cover body 10 (reinforcement frame 20).

[0023] This reduces the length (diameter) of the reinforcing frame 20, so that when the lid body 10 is placed over the opening (hole) H1, the reinforcing frame 20 fits securely inside the opening (hole) H1 without interfering with the edge of the opening (hole) H1. If there is a gap between the tip of each slide portion 30 and the opening (hole) H1 at this time, the fastening bolts 31 are further moved toward the outer periphery of the lid body 10 so that the tip comes into contact with the inner wall surface of the opening (hole) H1, and then the fastening bolts 31 are firmly tightened.

[0024] This fixes each slide part 30 in place, eliminating any gap between the tip of each slide part 30 and the opening (hole) H1, and reliably preventing rattling or misalignment. Note that the guide bolts 23 of the frames 21, 22, 22 simply pass through the elongated holes 32 of the slide part 30 and are not screwed into the slide part 30, so they do not restrict the movement of the slide part 30.

[0025] On the other hand, when fitting this temporary hole cover 100 to a large-diameter opening (hole) H2 with an inner diameter of 700 mm, for example, as shown in Figure 6, after placing the cover body 10 over the opening (hole) H2, loosen the fastening bolts 31 engaging with each long hole 11 on the cover body 10, as also shown in Figures 3(B) and 4(B), and move each fastening bolt 31 along the long hole 11 to the tip of the long hole 11 (the outer periphery side of the cover body 10).

[0026] Then, as the fastening bolts 31 move, the slide parts 30 slide toward the outer periphery of the lid body 10 (reinforcement frame 20), and when their tips come into contact with the inner wall surface of the opening (hole) H2, the fastening bolts 31 are firmly tightened. This fixes the slide parts 30 in place, eliminating any gaps between the tips of the slide parts 30 and the large-diameter opening (hole) H2, and the entire reinforcing frame 20 can be fitted snugly into the opening (hole) H2.

[0027] In this way, the temporary hole lid 100 of the present invention can fit tightly to various sizes of openings (holes) H, because the slide part 30 provided on the underside of the lid body 10 together with the reinforcing frame 20 slides radially outward or widthwise outward from the reinforcing frame 20 to abut against the inner surface of the opening (hole) H. Also, because the size of the reinforcing frame 20 can be changed from the top side of the lid body 10, the adjustment work can be easily performed.

[0028] In addition, since it is not necessary to form a large number of holes in the cover body 10, there is little risk of a large amount of rainwater or soil flowing into the opening (hole) H. Note that, although the embodiment shown in Fig. 1 to Fig. 6 shows an example of a circular opening (hole) H, it is also applicable to a rectangular opening (hole) H3 such as a street gutter as shown in Fig. 7, and can exert the same functions and effects.

[0029] 8 and 9, if any or all of the slide parts 30 are T-shaped, the number of contact points between the reinforcing frame 20 and the opening (hole) H increases, and the lid body 10 can be installed more stably. That is, in the example shown in Figs. 8 and 9, the slide parts 30 on the second frame 22, 22 side are T-shaped, and each slide part 30 has three long holes 11, and fastening bolts 31 are passed through the respective long holes 11, 11, 11 and screwed into the slide parts 30. As a result, the number of contact points between the reinforcing frame 20 and the opening (hole) H increases from four to six, improving stability, and it is also possible to omit the slide part 30 on the first frame 21 side.

[0030] As another example, as shown in Fig. 10, the reinforcing frame 20 may be Y-shaped and the sliding portions 30 may abut the openings (holes) H at three points, or conversely, the number of frames may be increased to five or more and arranged radially. Furthermore, it is not necessary to provide the sliding portions 30 at the tips of all frames, and similar functions and effects can be expected even if the sliding portions 30 are provided at only two points at least at the tips of the opposing second frames 22, 22, as shown in Fig. 11.

[0031] In addition, in Figure 1, symbol 40 indicates a keyhole into which a special tool is inserted to lift the temporary hole cover 100 and attach / detach it to hole H, and symbol 50 indicates a fixing hole used to fix the temporary hole cover 100 to the opening (hole) H side after installation with a bolt or the like (not shown).

[0032] Also, as shown in Fig. 12, a plurality of recesses 11a into which the head of the fastening bolt 31 fits may be formed along the edge of the elongated hole 11 on the lid body 10 side. That is, in the example shown in the figure, the fastening bolt 31 is provided with a ring-shaped flat washer 31a, and seven circular recesses 11a of a size that the flat washer 31a fits into are provided at equal intervals along the edge of the elongated hole 11. This can reliably prevent the fastening bolt 31 from shifting out of position even if the fastening bolt 31 loosens slightly due to vibration caused by the passing of a car, for example. Furthermore, by partially or entirely embedding the flat washer 31a and the bolt head in the recess 11a, the amount of protrusion of the fastening bolt 31 from the top surface of the lid body 10 can be reduced or eliminated.

[0033] 13, if a fixing nut 31b is welded to the sliding portion 30 and the fastening bolt 31 is screwed into this fixing nut 31b, the thickness of the angle steel constituting the sliding portion 30 can be reduced, thereby achieving weight reduction. That is, since the fastening bolt 31 is directly screwed into the sliding portion 30 made of angle steel as described above, the angle steel needs to have a certain thickness in order to screw in securely, but if the fixing nut 31b is used in this way, it becomes unnecessary to screw it directly into the sliding portion 30, and therefore the thickness can be kept to a minimum. [Explanation of symbols]

[0034] 10…Lid body 11...Slotted hole 11a…dent 20…Reinforcement frame 21…1st frame 22…2nd frame 23...Guide bolt 30…Slide section 31... Fastening bolt 31a... Flat washer 31b…Fixing bolt 32…Slotted hole 40…Keyhole 50…Fixing hole 100...Temporary hall cover H, H1~H3...Openings (holes)

Claims

1. A temporary hall cover that covers an opening and closes it, The device includes a circular or rectangular lid body that is larger than the opening, a reinforcing frame provided on the underside of the lid body so as to be positioned within the opening, and a sliding portion that slides toward the radial outer periphery or widthwise outer side of the reinforcing frame and abuts against the inner surface of the opening, A temporary lid for a hall, characterized in that the sliding portion is supported on the underside of the lid body by screwing into a fastening bolt inserted from the top side of the lid body through a long hole formed in the lid body extending in the radial or width direction of the lid body.

2. The temporary hole cover according to claim 1, A temporary cover for a hole, characterized in that a plurality of recesses into which the heads of the fastening bolts fit are formed along the edge of the long hole.

3. The temporary hole cover according to claim 1, A temporary lid for a hall, wherein the reinforcing frame extends from approximately the center of the lid body in a cross or Y shape.

4. The temporary hole cover according to claim 3, A temporary lid for a hall, wherein the slide portion is I-shaped or T-shaped and extends radially or widthwise of the lid body.

5. The temporary cover for a hall according to any one of claims 1 to 4, A temporary hall cover, characterized in that the cover body is made of checkered steel plate.

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