JP2018197438A - Guard fence for manhole - Google Patents

Abstract

To provide a guard fence for a manhole which is good at stability during use, facilitates a working person to access, allows a person or an object to effectively prevent from falling into the manhole, and is capable of being stored in a compact manner after use.SOLUTION: A guard fence 100 for a manhole is provided with: a jack base 15 arranged on a lower ends 11b to 14b of respective columns 11 to 14 erectable on an installation surface G; beam members 21 (22) to connect columns 11, 13 (12, 14) to each other arranged to form an X-shape on upper ends 11a to 14a of the columns 11 to 14; an axial body 20 pivotably supporting the beam members 21, 22; an outer frame 40 arranged in lower areas of side surfaces 32 to 34 among side surfaces 31, 32, 33, 34 of a virtual square cylindrical body 30 formed with the columns 11 to 14; an open/close member 50 arranged in a lower area of the other side surface 31; and an elastic member 46 sealing a gap between the installation surface G and a lower edge member 41 of the outer frame 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a manhole protective fence that is installed so as to surround the opening of a manhole for the purpose of ensuring the safety of workers, pedestrians, and the like when performing various operations in the manhole.

  For manhole protection means installed so as to surround the opening of the manhole when performing various operations in the manhole, those having various structures and functions have been proposed in the past. For example, “manhole guard” described in Japanese Patent Application Laid-Open No. H10-284707 is known.

  The “manhole guard” is a manhole guard that surrounds the periphery of the opening of the manhole by combining two fence bodies having a substantially semicircular cross section. Each fence body covers the lower part with a plate body, and the upper part is a frame body. The opposite ends of the two fence bodies are pivotally supported by hinges, and the other opposite edges are connected by a stretchable support material, so that the plates of the fence bodies are appropriately arranged. A cutout portion through which a cable or a tube can be inserted is provided at the location, and the cutout portion is covered with a flexible shielding piece so as to be opened and closed.

  The “manhole guard” can be inserted even when a large workpiece is carried into or out of the manhole while cables and pipes can be inserted into the manhole opening while surrounding the manhole opening. There is no need to cancel the above, and the manhole guard can be expanded in accordance with the diameter of the opening of the manhole.

Japanese Patent Laid-Open No. 10-1960

  However, the “manhole guard” described in Patent Document 1 has a large number of parts, has a complicated structure, is difficult for an operator to enter and exit, and the entire circumference of the lower edge portion of the cylindrical fence body. Is grounded, and if the installation surface is uneven or the installation surface is inclined, it may be difficult to hold the fence body in a stable vertical posture.

  Furthermore, since the cylindrical fence body constituting the “manhole guard” is a combination of two fence bodies having a substantially semicircular cross section, it may be disassembled when transported or stored. A relatively large storage space is required.

  Therefore, the problem to be solved by the present invention is that the stability during use is good, the entry and exit of the worker is easy, and it is possible to effectively prevent the fall of a person or an object into the manhole. The rest is to provide a manhole guard that can be stored compactly.

The manhole guard fence according to the present invention is
4 columns that can stand on the installation surface,
Strut extension means provided on at least one of the struts;
Two beam members that are arranged to form an X shape on the upper end side of the support column and that connect the two support columns facing each other;
A shaft body parallel to the support column that pivotally supports the intersecting portion of the beam material,
An outer frame that is detachably disposed on three of the four side surfaces of the virtual rectangular cylindrical body formed by the four support columns, and an opening / closing member that is detachably disposed on the remaining side surfaces When,
And an elastic member that closes a gap between the installation surface and a lower edge of the outer frame.

  Here, in the manhole protection fence, the opening and closing member is attached to the remaining side surface so as to be detachable and attached to the door frame so as to be rotatable via a hinge. It is desirable that the door body is provided.

  Moreover, in the manhole protection fence, it is desirable that the support column expansion / contraction means is a jack base disposed at a lower end portion of the support column.

  Furthermore, in the manhole protection fence, the outer frame and the opening / closing member can be joined to the support column via an uneven fitting mechanism or a male / female fitting mechanism.

  On the other hand, in the manhole protective fence, air blowing means into the manhole can be arranged on at least one of the outer frames.

  In the manhole guard fence, a safety block can be provided on the beam material.

  According to the present invention, the stability during use is good, it is easy for workers to enter and exit, it is possible to effectively prevent people and objects from falling into the manhole, and can be stored compactly after use. Manhole guard fence can be provided.

It is a partially-omission perspective view which shows the manhole protection fence which is embodiment of this invention. FIG. 2 is a partially omitted plan view of the manhole protection fence shown in FIG. 1. It is a partially-omission perspective view which shows the support | pillar and beam which comprise the manhole protection fence shown in FIG. It is a figure which shows the outer frame which comprises the manhole protection fence shown in FIG. It is an exploded view which shows the opening-and-closing member which comprises the manhole protection fence shown in FIG.

  Hereinafter, the manhole protection fence 100 which is embodiment of this invention is demonstrated based on FIGS.

  As shown in FIGS. 1 and 2, the manhole guard fence 100 according to the present embodiment includes four columns 11, 12, 13, 14, two beam members 21, 22, bolts 25b and nuts 25a. Three outer frames 40, one opening / closing member 50, an elastic member 46, and other members described later are provided.

  The four struts 11, 12, 13, and 14 can be erected in the vertical direction on the installation surface G, and strut expansion means are provided at the lower ends 11b, 12b, 13b, and 14b of the struts 11, 12, 13, and 14, respectively. A jack base 15 is attached. On the upper end portions 11a, 12a, 13a, and 14a side of the columns 11, 12, 13, and 14, there are two beam members 21 and 22 that connect the two columns 11 and 13 (12 and 14) that face each other. Bolts 25b and nuts 25a inserted in parallel with the columns 11, 12, 13, and 14 are provided in order to connect the intersecting portions of the beam members 21 and 22 to each other, arranged in an X shape. A safety block 70 is attached to the lower end side of the bolt 25b via a connecting member (not shown).

  As shown in FIGS. 1 and 2, three side surfaces 32 of the four side surfaces 31, 32, 33, 34 of the virtual rectangular cylindrical body 30 formed by the four support columns 11, 12, 13, 14, The outer frame 40 is detachably disposed in the lower regions 33 and 34, and the opening / closing member 50 is detachably disposed in the lower region of the remaining side surface 31. In order to close the gap between the installation surface G and the lower edge member 41 that forms the lower edge of the outer frame 40, a flat elastic member 46 is attached to the lower edge member 41 in a hanging manner. The elastic member 46 is a rubber plate, the upper edge portion 46 a of the elastic member 46 is attached to the inner surface of the lower edge member 41 with a plurality of screws 47, and the lower edge portion 46 b of the elastic member 46 is in contact with the installation surface G. Thus, the outer frame 40 is curved so as to spread outward.

  As shown in FIG. 3, by connecting the upper end portions 11a, 13a (12a, 14a) of the two columns 11, 13 (12, 14) with a beam member 21 (22), a gate-shaped column member 20a, 20b is formed. These strut members 20a and 20b are overlapped so that the beam members 21 and 22 are three-dimensionally crossed with each other at their central portions, and are formed in the vertical through holes 20c and 20d provided at the intersecting portions of the beam members 21 and 22. 1 is inserted and tightened with a nut 25a to form the column unit 20 shown in FIGS.

  When the nut 25a is loose, the two beam members 21 and 22 arranged so as to form an X shape can be rotated around the bolt 25b, and the two beam members 21 and 22 are orthogonal to each other. In this case, a stopper 24 for holding the state is provided on the side surface of the beam 21 near the through hole 20c. Jack base nuts 11n, 12n, 13n, and 14n are provided at the lower ends 11b, 12b, 13b, and 14b of the columns 11, 12, 13, and 14, respectively.

  The jack base 15 includes a base plate 15a that is grounded to the installation surface G, a bolt shaft 15b that is erected on the base plate 15a, and a female screw-shaped handle member 15c that is screwed onto the bolt shaft 15b. By inserting and screwing the upper end side of the bolt shaft 15b of the jack base 15 into the jack base nuts 11n, 12n, 13n, 14n, the lower end portions 11b, 12b, 13b, Each jack base 15 is attached to 14b. By reversing the handle member 15c in the normal direction, the base plate 15a is moved back and forth, so that the lengths of the columns 11, 12, 13, and 14 can be individually changed.

  As shown in FIG. 3 to be described later, a plurality of tubular bodies 26 for inserting hooks of the outer frame 40 are fixed to the outer peripheral surfaces of the support columns 11, 12, 13, and 14. The plurality of tubular bodies 26 are fixed so that their axial directions are parallel to the axial directions of the columns 11, 12, 13, and 14.

  As shown in FIG. 4, the outer frame 40 is a U-shaped member formed by combining rectangular cylinders in a vertical and horizontal manner, and is respectively formed on the upper and lower portions of the outer periphery of the opposing side edge members 42 and 42. L-shaped hooks 43 and 43 are provided. Each hook 43 is disposed so as to protrude outward from the side edge members 42, 42, and the shaft portion 43 a of the hook 43 is folded downward (in the direction in which the lower edge member 41 is present) so as to be parallel to the side edge member 42. It's a song. A flat plate-like elastic member (rubber plate) 46 is attached below the lower edge member 41.

  In the outer frame 40, two lattice members 45, 45 are arranged in a cross shape in a rectangular portion surrounded by the upper edge member 44, the side edge members 42, 42, and the lower edge member 41. In the outer frame 40, the four regions S partitioned by the lattice members 45 and 45 have a width that allows insertion of a blowing duct (for example, φ300 mm) for supplying air from the ground into the manhole. . Moreover, as shown in FIG. 1, in the manhole protection fence 100, the ventilation means 60 (for example, ventilation fan) into the manhole can also be arrange | positioned to the at least 1 outer frame 40. FIG.

  As shown in FIGS. 1 and 5, the opening / closing member 50 disposed in the lower region of the side surface 31 of the four side surfaces 31, 32, 33, 34 of the virtual rectangular tubular body 30 is detachable from the side surface 31. A substantially U-shaped door frame 51 arranged and a door body 55 rotatably attached to the door frame 51 via a plurality of hinges 56x are provided. The width 40w of the outer frame 40 shown in FIG. 4 is the same as the width 51w of the door frame 51 shown in FIG.

  As shown in FIG. 5, the door frame 51 is a sill that connects two support members 52 a and 52 b erected so as to be parallel to each other at a predetermined distance and the lower ends of the support members 52 a and 52 b. The material 53 is provided. The support members 52a and 52b are formed by combining and joining a rectangular tube material or the like, and have a mirror-symmetrical structure. The support members 52a and 52b are formed by connecting the upper end portion and the lower end portion of the two support members 54 and 54 arranged in parallel with the connection members 54a and 54b, respectively, and fixing the reinforcing member 54c to the intermediate portion. Yes.

  In the support members 52a and 52b, L-shaped hooks 43 and 43 are respectively provided on the upper and lower portions of the outer periphery of the support members 54 and 54 located on the outer sides. Each hook 43 is disposed so as to protrude outward from the support members 54, 54, and the shaft portion 43 a of the hook 43 is bent downward (in the direction in which the sill 53 is present) so as to be parallel to the support member 54. Yes. Semi-circular locking members 54d and 54d are fixed to the upper surfaces of the joining members 54a and 54a, respectively.

  As shown in FIG. 5, the door body 55 is a U-shaped member formed by combining rectangular cylinders vertically and horizontally, and is joined to each other. The opposing side edge members 56, 56, and the side edge members 56, 56, an upper edge member 57 and a lower edge member 58 that connect the upper end portion and the lower end portion, respectively, and two lattice members 59a and 59b that are arranged in a square shape surrounded by these members, It is equipped with.

  In the door body 55 shown in FIG. 5, hinges 56x and 56x are attached to the upper and lower portions of the side edge member 56 on the right side of the door body. The hinges 56x and 56x support the door body 55 so that it can be opened and closed by being interposed between the support members 52b of the door frame 51. A lock member 57a having a U-shaped cross section is provided via a support shaft 57b at a portion near the left end of the upper edge member 57 forming the door body 55 (directly above the upper end of the side edge member 56 located on the left side). It is mounted so that it can turn up and down.

  After closing the door body 55, when the lock member 57a is tilted down to a horizontal state, the lock member 57a is engaged so as to cover the joint member 54a at the upper end of the support member 52a on the left side of the door frame 51. It can be locked so that it does not open easily.

  Next, the usage and function of the manhole protection fence 100 will be described. As shown in FIGS. 1 and 2, the column unit 20 set so that the beam members 21 and 22 of the column members 20 a and 20 b are orthogonal to each other is placed on the installation surface G around the manhole opening MH. When the installation surface G is uneven or inclined, the handle member 15c of the jack base 15 at the lower end of the columns 11, 12, 13, 14 is rotated to adjust the protruding length of the base plate 15a. Then, the support columns 11, 12, 13, and 14 are set so as to maintain a vertical posture on the installation surface G without rattling.

  Thereafter, in a region below three side surfaces 32, 33, 34 of the four side surfaces 31, 32, 33, 34 of the virtual rectangular cylindrical body 30 formed by the four columns 11, 12, 13, 14. The outer frame 40 is disposed, and the opening / closing member 50 is disposed in a region below the remaining side surface 31. At this time, the shaft portions 43 a (see FIG. 4) of the plurality of hooks 43 provided on the outer frame 40 and the door frame 51 are placed in the plurality of tubular bodies 26 provided on the outer circumferences of the columns 11, 12, 13, and 14. By inserting each, the outer frame 40 and the door frame 51 are joined to the support columns 11, 12, 13, and 14.

  In the manhole guard fence 100 of the present embodiment, the outer frame 40 and the door frame 51 can be attached to and detached from the support columns 11, 12, 13, and 14 through a male / female fitting mechanism including the shaft portion 43a of the hook 43 and the tubular body 26. However, the present invention is not limited to this, and for example, it can be joined via an uneven fitting mechanism formed by a protrusion and a hole.

  With the above operation, the manhole protection fence 100 is installed so as to surround the manhole opening MH. Thereafter, when the lock member 57a is raised to release the lock and the door body 55 is opened, the operator can enter and exit the manhole. When the worker descends into the manhole and performs various operations, safety can be ensured by locking the wire rope 71 of the safety block 70 to the harness of the worker.

  Since the lengths of the pillars 11, 12, 13, and 14 constituting the manhole protection fence 100 can be adjusted using the respective jack bases 15, they can be installed according to the situation of the installation surface G and used. The inside stability is good. Moreover, since the manhole protection fence 100 is provided with the door body 55 arrange | positioned so that opening and closing is possible between the support | pillars 11 and 12 which oppose, an operator can go in and out easily.

  Furthermore, if the manhole protective fence 100 is installed so as to cover the manhole opening MH on the construction site, the manhole opening MH is surrounded by the three outer frames 40 and the opening / closing member 50. Of people (pedestrians, workers, etc.) and objects (materials, tools, etc.) can be effectively prevented.

  In the manhole protection fence 100, the gap between the lower edge member 41 of the three outer frames 40 and the installation surface G is in contact with the installation surface G and is bent outward so that the elastic member 46 spreads in a skirt shape. The sill material 53 located at the lower edge portion of the door frame 51 is disposed close to the installation surface G. For this reason, it is possible to prevent a tool, material, stone or the like placed on the installation surface G outside the manhole protective fence 100 from being accidentally kicked or jumped off by a car and falling into the manhole. Can do.

  After the work in the manhole is completed, when the three outer frames 40 and the opening / closing member 50 constituting the manhole protection fence 100 are removed from between the columns 11, 12, 13, 14, the outer frame 40 and the opening / closing member 50 are flat. Because it is a shape close to, it can be overlapped. Thereafter, when the column unit 20 is moved away from the installation surface G and the beam members 21 and 22 constituting the column unit 20 are rotated in the overlapping direction, the column unit 20 is flatly folded. Thus, the used manhole protection fence 100 can be disassembled into a plurality of members and stored compactly.

  In addition, the manhole protection fence 100 demonstrated based on FIGS. 1-5 shows an example of this invention, and the manhole protection fence which concerns on this invention is not limited to the manhole protection fence 100 mentioned above.

  The manhole protection fence according to the present invention can be widely used in industrial fields such as civil engineering as a safety ensuring means for workers and pedestrians when performing various operations in the manhole.

11, 12, 13, 14 Post 11a, 12a, 13a, 14a Upper end 11b, 12b, 13b, 14b Lower end 11n, 12n, 13n, 14n Jack base nut 15 Jack base 15a Base plate 15b Bolt shaft 15c Handle member 20 Post Units 20a, 20b Prop members 20c, 20d Through-holes 21, 22 Beam material 24 Stopper 25a Nut 25b Bolt 26 Tubular body 30 Virtual square tubular body 31, 32, 33, 34 Side surface 40 Outer frame 41, 58 Lower edge member 42, 56 Side edge member 43 Hook 43a Shaft part 44, 57 Upper edge member 57a Lock member 45, 59a, 59b Lattice member 46 Elastic member 46a Upper edge part 46b Lower edge part 47 Screw 50 Opening / closing member 51 Door frame 52 Hinge 52a, 52b Support Member 53 Sill material 54 Support Wood 54a, 54b connecting member 54c reinforcing member 54d engaging member 55 the door 60 blower means 70 secure the block 100 manhole fences G installation surface MH manhole opening S region

The manhole guard fence according to the present invention is
4 columns that can stand on the installation surface,
Strut extension means provided on at least one of the struts;
Two beam members that are arranged to form an X shape on the upper end side of the support column and that connect the two support columns facing each other;
A shaft body parallel to the support column that pivotally supports the intersecting portion of the beam material,
An outer frame that is detachably disposed on three of the four side surfaces of the virtual rectangular cylindrical body formed by the four support columns, and an opening / closing member that is detachably disposed on the remaining side surfaces When,
An elastic member that is attached to the lower edge portion of the outer frame in a hanging manner and is in a state of being bent outwardly in contact with the installation surface and closing the gap between the installation surface and the lower edge portion of the outer frame and, with a,
The open / close member includes a substantially U-shaped door frame that is detachably disposed on the remaining side surface, and a door body rotatably attached to the door frame via a hinge. The sill material located in the lower edge portion is disposed close to the installation surface .

Here, in the manhole protection fence, the opening and closing member is attached to the remaining side surface so as to be detachable and attached to the door frame so as to be rotatable via a hinge. A sill material located at a lower edge portion of the door frame is disposed adjacent to the installation surface .

Claims (6)

4 columns that can stand on the installation surface,
Strut extension means provided on at least one of the struts;
Two beam members that are arranged to form an X shape on the upper end side of the support column and that connect the two support columns facing each other;
A shaft body parallel to the support column that pivotally supports the intersecting portion of the beam material,
An outer frame that is detachably disposed on three of the four side surfaces of the virtual rectangular cylindrical body formed by the four support columns, and an opening / closing member that is detachably disposed on the remaining side surfaces When,
A manhole protection fence comprising: an elastic member that closes a gap between the installation surface and a lower edge of the outer frame.   The said opening-and-closing member is provided with the substantially U-shaped door frame arrange | positioned so that attachment or detachment is possible to the said remaining side surface, and the door body rotatably attached to the said door frame via the hinge. The described manhole guard fence.   The manhole protection fence according to claim 1 or 2, wherein the support expansion / contraction means is a jack base disposed at a lower end of the support.   The manhole protection fence according to any one of claims 1 to 3, wherein the outer frame and the opening / closing member are joined to the support through an uneven fitting mechanism or a male / female fitting mechanism.   The manhole protection fence in any one of Claims 1-4 which has arrange | positioned the ventilation means to the inside of a manhole in the at least 1 said outer frame.   The manhole protection fence in any one of Claims 1-5 provided with the safety block in the said beam material.

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