JP5292539B2 - Safety work fence for manhole and construction method of manhole work using it - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a safety hole for a manhole used for work safety when working in a manhole, that is, in a manhole, and more particularly, a manhole cover frame that is opened when working in a manhole. TECHNICAL FIELD The present invention relates to a safety work fence for a manhole that is detachably attached to the body and a construction method for a manhole construction using the same.

Japanese Laid-Open Utility Model Publication No. 7-23085 discloses a device for ensuring the safety of workers in and out of manholes or manholes in sewerage facilities.
The manhole work safety device of the prior art (the reference sign indicates that in the publication) is inclined toward the center with respect to the lower ring 1 having the same outer diameter as the outer diameter of the manhole cover and the lower ring 1. A notch upper ring 3 having a smaller diameter than that connected by a plurality of slant rods 2 and a grip bar 5 provided on the lower ring 1 in the notch portion 4 of the upper ring 3. The nail | claw 7 for detachment prevention is suspended.
In the use of the prior art work safety device, the manhole cover is removed, the lower ring 1 of this device is fitted, and the operator holds the upper ring 3 and the grip rod 5 from the notch 4 of the upper ring 3. It enters into it, puts a foot on the step (step) in the manhole and gets down into the manhole.
However, in the prior art, it corresponds to a manhole having a specific kind of caliber, and cannot be used for other calibers. It may be placed on a slippery upper surface, or may come off from the upper surface of the manhole, and the claw 7 for preventing the detachment will not function, fixing will not be performed, resulting in an unstable installation, and there is a problem in safety.

Japanese Utility Model Publication No. 7-23085

The present invention has been made in view of the above circumstances, and it is possible to obtain a safety work fence for a human hole that can cope with a difference in the diameter of the human hole and that can realize a stable installation and can be more reliably fixed. With the goal.
For this reason, this invention pays attention to the opening recessed part of a human-hole lid frame, and achieved this objective by the novel idea which uses the bottom plate which settles in the opening recessed part by upside down.
Another object of the present invention is to obtain a construction method for manhole construction by utilizing the characteristics of the safety work fence body for manholes.

The present invention specifically adopts the following configuration.
1st of this invention (henceforth "the 1st invention") relates to the safety work fence body for manholes, As described in claim 1,
A safety work fence body for a human hole that is placed on a receiving surface in an opening concave portion of two types of circular human hole lid frames with different diameters that are opened and reversibly attached to the human hole lid frame. ,
A notch is formed in the rear part, and an annular lower bottom plate part placed in contact with the receiving surface in the opening recess of the one human hole lid frame,
A plurality of pillars erected in a row in an inner diameter direction from the lower bottom plate,
A notch is formed in the front part, and an annular upper bottom plate part fixed on the upper part of the pillar and fixed in contact with the receiving surface in the opening recess of the other manhole cover frame , Consists of
The both notches maintain a width space for workers to enter and exit,
The outer diameter of the lower bottom plate portion corresponds to a large-diameter human hole lid frame, the outer diameter of the upper bottom plate portion corresponds to a small-diameter human hole lid frame,
The lower and upper bottom plate portions are composed of a bottom plate body that directly contacts the receiving surface of the human hole lid frame and a frame rod fixed to the bottom plate body.
It is characterized by that.
In the above configuration, the “opening recess of the human hole lid frame” refers to a portion into which the lid formed on the inner periphery of the annular upper opening of the human hole lid frame is fitted.
Further, the “receiving surface” of the human hole lid frame includes a horizontal receiving surface and a curved receiving surface depending on the form of the human hole lid frame, as shown in the following first and second embodiments.
In the present invention,
1. One end is engaged with the main body of the fence excluding the bottom plate portion that abuts the manhole cover frame, the other end is engaged with the main body portion of the manhole cover frame or the manhole, and the tension member disposed between these both ends Taking an aspect comprising a locking tool into which traction force is introduced;
Are part of the present invention.

(Function)
When installing the safety work fence body for one person hole on one large-diameter manhole cover frame, the person hole cover frame is opened, and the lower bottom plate portion of the safety work fence body is opened to the recessed portion of the person hole cover frame. Is inserted and supported on the receiving surface, and the rear notch is placed across the hinge part of the human hole lid frame, and then the safety work fence for the main hole is inserted into the human hole lid frame or It settles in the human hole.
The fixed safety work fence for manholes serves as a sign of traffic, and ensures the safety of passers-by and vehicles. Further, the worker enters and exits the manhole through the notch of the installed safety work fence body.
Installation on the other small-diameter manhole cover frame reverses the main hole safety work fence body, fits the upper bottom plate part into the opening recess of the manhole cover frame, and inserts the front notch into the manhole. It is arranged across the hinge part of the lid frame, and then the safety work fence body for the main hole is fixed to the human hole lid frame or the human hole by the locking tool.

The second of the present invention (hereinafter referred to as “second invention”) also relates to a safety work fence for manholes, and as described in claim 4,
A safety work fence body for a human hole that is placed on a receiving surface in an opening concave portion of two types of circular human hole lid frames with different diameters that are opened and reversibly attached to the human hole lid frame. ,
A notch is formed in the rear part, and an annular lower bottom plate part placed in contact with the receiving surface in the opening recess of the one human hole lid frame,
A plurality of pillars erected in a row in an inner diameter direction from the lower bottom plate,
A notch is formed in the front part, and an annular upper bottom plate part fixed on the upper part of the pillar and fixed in contact with the receiving surface in the opening recess of the other manhole cover frame , Consists of
The both notches maintain a width space for workers to enter and exit,
The outer diameter of the lower bottom plate portion corresponds to a large-diameter human hole lid frame, the outer diameter of the upper bottom plate portion corresponds to a small-diameter human hole lid frame,
The lower and upper bottom plate portions are composed of a bottom plate body that directly contacts the receiving surface of the manhole cover frame and a frame rod fixed to the bottom plate body,
The large-diameter human hole lid frame and the small-diameter human hole lid frame are selected from two types of standards that occupy most in a specific area.
It is characterized by that.
In the above configuration, the “opening recess of the manhole cover frame” and the “receiving surface” of the manhole cover frame are in accordance with the first invention.
In the present invention,
1. One end is engaged with the main body of the fence excluding the bottom plate portion that abuts the manhole cover frame, the other end is engaged with the main body portion of the manhole cover frame or the manhole, and the tension member disposed between these both ends Taking an aspect comprising a locking tool into which traction force is introduced;
Are part of the present invention.

(Function)
When installing the safety work fence body for one person hole on one large-diameter manhole cover frame, the person hole cover frame is opened, and the lower bottom plate portion of the safety work fence body is opened to the recessed portion of the person hole cover frame. Is inserted and supported on the receiving surface, and the rear notch is placed across the hinge part of the human hole lid frame, and then the safety work fence for the main hole is inserted into the human hole lid frame or It settles in the human hole.
The fixed safety work fence for manholes serves as a sign of traffic, and ensures the safety of passers-by and vehicles. Further, the worker enters and exits the manhole through the notch of the installed safety work fence body.
Installation on the other small-diameter manhole cover frame reverses the main hole safety work fence body, fits the upper bottom plate part into the opening recess of the manhole cover frame, and inserts the front notch into the manhole. It is arranged across the hinge part of the lid frame, and then the safety work fence body for the main hole is fixed to the human hole lid frame or the human hole by the locking tool.

The third of the present invention (hereinafter referred to as "third invention") relates to a construction method for manhole construction, and as described in claim 5,
A safety work fence body for a human hole that is placed on a receiving surface in an opening concave portion of two types of circular human hole lid frames with different diameters that are opened and reversibly attached to the human hole lid frame. ,
A notch is formed in the rear part, and an annular lower bottom plate part placed in contact with the receiving surface in the opening recess of the one human hole lid frame,
A plurality of pillars erected in a row in an inner diameter direction from the lower bottom plate,
A notch is formed in the front part, and an annular upper bottom plate part fixed on the upper part of the pillar and fixed in contact with the receiving surface in the opening recess of the other manhole cover frame , Consists of
The both notches maintain a width space for workers to enter and exit,
The outer diameter of the lower bottom plate portion corresponds to a large-diameter human hole lid frame, the outer diameter of the upper bottom plate portion corresponds to a small-diameter human hole lid frame,
The lower and upper bottom plate portions are composed of a bottom plate body that directly contacts the receiving surface of the manhole cover frame and a frame rod fixed to the bottom plate body,
The large-diameter manhole cover frame and the small-diameter manhole cover frame use a safety work fence for manholes selected from two kinds of standards occupying most in a specific area,
Attach it to the open circular human hole lid frame to carry out human hole work.
It is characterized by that.
In the above configuration, the “opening recess of the manhole cover frame” and the “receiving surface” of the manhole cover frame are in accordance with the first invention and the second invention.
In the present invention,
1. One end is engaged with the main body of the fence excluding the bottom plate portion that abuts the manhole cover frame, the other end is engaged with the main body portion of the manhole cover frame or the manhole, and the tension member disposed between these both ends Taking an aspect comprising a locking tool into which traction force is introduced;
Are part of the present invention.

(Function)
When installing the safety work fence body for one person hole on one large-diameter manhole cover frame, the person hole cover frame is opened, and the lower bottom plate portion of the safety work fence body is opened to the recessed portion of the person hole cover frame. Is inserted and supported on the receiving surface, and the rear notch is placed across the hinge part of the human hole lid frame, and then the safety work fence for the main hole is inserted into the human hole lid frame or It settles in the human hole.
The fixed safety work fence for manholes serves as a sign of traffic, and ensures the safety of passers-by and vehicles. Further, the worker enters and exits the manhole through the notch of the installed safety work fence body.
Installation on the other small-diameter manhole cover frame reverses the main hole safety work fence body, fits the upper bottom plate part into the opening recess of the manhole cover frame, and inserts the front notch into the manhole. It is arranged across the hinge part of the lid frame, and then the safety work fence body for the main hole is fixed to the human hole lid frame or the human hole by the locking tool.

Another aspect of the present invention relates to a locking device for a safety work fence for a manhole,
Used for safety work fences for human holes that are placed on the receiving surface in the opening recesses of two types of circular human hole lid frames with different diameters that are opened and detachably mounted on the human hole lid frame. ,
A notch is formed in the rear part, and an annular lower bottom plate part placed in contact with the receiving surface in the opening recess of the one human hole lid frame,
A plurality of pillars erected in a row in an inner diameter direction from the lower bottom plate,
A notch is formed in the front part, and an annular upper bottom plate part fixed on the upper part of the pillar and fixed in contact with the receiving surface in the opening recess of the other manhole cover frame, Consists of
The both notches hold a width space for an operator to enter and exit, the outer diameter of the lower bottom plate portion corresponds to a large-diameter manhole cover frame, and the outer diameter of the upper bottom plate portion corresponds to a small-diameter manhole cover frame. Correspondingly, the lower and upper bottom plate portions are used for a safety work fence for a manhole comprising a bottom plate body that directly contacts the receiving surface of the manhole cover frame and a frame rod fixed to the bottom plate body. A stop,
An upper engaging member that engages with the safety work fence body excluding a bottom plate that contacts the human hole lid frame, a lower engaging member that engages with the human hole lid frame or the main body of the human hole,
An interposition member that introduces and holds tension in the tension member disposed between the upper engagement member and the lower engagement member;
It is characterized by comprising.
In the above configuration, the “opening recess of the manhole cover frame” and the “receiving surface” of the manhole cover frame are in accordance with the first to third inventions.
In addition, the upper engagement member, the interposition member, and the lower engagement member are specifically shown in the following embodiments. For example, the upper engagement member takes the form of a mounting bracket, and the interposition member is for a coupling bracket / rope. A series of assembling modes of the fixed adjusting tool and the rope is adopted, and the lower engaging member is a hook metal fitting or a fishhook-like metal fitting.
In this aspect,
1. The tension member takes a rope-like or belt-like form,
Is part of this embodiment.

(Function)
When installing the safety work fence body for one person hole on one large-diameter manhole cover frame, the person hole cover frame is opened, and the lower bottom plate portion of the safety work fence body is opened to the recessed portion of the person hole cover frame. Is inserted and supported on the receiving surface, and the rear notch is placed across the hinge part of the human hole lid frame, and then the safety work fence for the main hole is inserted into the human hole lid frame or It settles in the human hole.
The fixed safety work fence for manholes serves as a sign of traffic, and ensures the safety of passers-by and vehicles. Further, the worker enters and exits the manhole through the notch of the installed safety work fence body.
Installation on the other small-diameter manhole cover frame reverses the main hole safety work fence body, fits the upper bottom plate part into the opening recess of the manhole cover frame, and inserts the front notch into the manhole. It is arranged across the hinge part of the lid frame, and then the personal hole safety work fence body is fixed to the human hole lid frame by a locking tool.
The locking tool takes the reaction force on the lower hole engaging member that engages with the human hole lid frame or the main body of the human hole, and the person's safety work fence body for the person's hole is moved by the tension force introduced and held by the tension member. Pressing the hole cover frame side, the person's hole safety work fence is fixed to the person hole cover frame.
Also, the tension force introduced and held in the tension member is released, the upper engagement member and / or the lower engagement member are disengaged, and the safety work fence body for the main hole is easily removed from the human hole cover frame. Can do.

According to the safety work fence for manholes of the first invention of the present invention, since the fence body itself is installed in the opening recess of the manhole cover frame, stability is ensured. It is installed firmly and securely by the fasteners.
By installing the safety work fence body for manholes, traffic safety is ensured, and the safety of entering and exiting workers through the safety work fence body for manholes can be ensured.
In addition, by reversing the safety work fence for the person's hole, it is possible to handle a small-diameter human hole cover frame, and the installation procedure and usage mode do not change from the steady state, and the applicable range of the human hole cover frame is applicable. Can be expanded.
According to the safety work fence body for manholes of the second invention, in addition to the effects of the first invention, one kind of safety work fence body can cope with all human holes in a specific area, and the diameter of the manholes each time The work for confirming the work is not necessary, the work for the work is speeded up by that amount, and the production cost of the safety work fence body can be greatly reduced.
According to the construction method of the manhole construction of the third invention, it is possible to cope with all the manholes in a specific area with one kind of safety work fence body, and it is not necessary to check the diameter of the manhole each time, Corresponding to the construction is speeded up by that much, and it is epoch-making.

The plane block diagram which shows the whole manhole cover frame in which the safety work fence body for manholes of this invention is installed. BRIEF DESCRIPTION OF THE DRAWINGS The front block diagram which shows the whole one Embodiment of the safety work fence body for manholes of this invention. The top view of this safety work fence body (3 direction arrow line view of FIG. 2). Sectional drawing (4-4 arrow directional view of FIG. 3) of this safety work fence body. The block diagram of the latch used for fixation of this safety work fence body. The figure which shows the other aspect of a locking tool. Sectional block diagram which shows the principal part of other embodiment of the safety work fence body for manholes of this invention.

(First embodiment)
An embodiment of a safety work fence for manholes according to the present invention will be described with reference to the drawings.
FIGS. 1-5 shows the safety work fence body S for manholes of the one Embodiment (1st Embodiment).
That is, FIG. 1 shows the manhole cover frame M on which the safety work fence body S for the principal hole is installed, and FIGS. 2 to 4 show the entire configuration of the safety work fence body S for the principal hole. Reference numeral 6 denotes the portion and detailed configuration.
The safety work fence body for the personal hole (hereinafter simply referred to as “safe work fence body”) S is used by being attached to the opened human hole cover frame M. Description of the safety work fence body S The side where the worker enters and exits is defined as the front part.
As shown in the following embodiment, the safety work fence body S corresponds to two types of manhole cover frames M and M ′ according to the size of the caliber (outer diameter of the receiving shelf). M is of large diameter and M ′ is of small diameter.

First, the human hole lid frame M on which the personal hole safety work fence S is installed will be described. A predetermined iron lid F (not shown, only a symbol) is fitted and attached to the personal hole lid frame M and is in a closed state. In addition, although this iron cover F takes a hinge type, since an iron cover remove | deviates from the meaning of this invention, the detailed description is abbreviate | omitted.
Manhole cover frame M (See Figs. 1 and 2)
The personal hole cover frame M has a basic configuration in which an annular main body 100 and a bottom plate portion 102 that is horizontally stretched on the outer periphery of the lower end of the main body 100 are integrally formed of iron. On the outer surface of the main body 100, ribs 104 that are integral with the bottom plate portion 102 are provided so as to be spaced apart. The upper surface 106 of the main body 100 is a smooth surface, and the inner peripheral surface of the main body 100 is formed with a tapered surface 108 that decreases in diameter as it goes downward, and a horizontal receiving surface 110 is formed following the tapered surface 108. A shelf 112 having an upper surface is projected, and a vertical lower wall surface 114 is formed below the shelf 112. The concave portion of the inner peripheral surface of the main body 100, that is, the tapered surface 108 and the receiving surface 110 of the shelf portion 112 form an opening concave portion of the personal hole lid frame M.
Reference numeral 120 denotes a hinge holding portion integrally projecting at one place on one inner peripheral portion of the human hole lid frame M (this portion is defined as the rear portion of the human hole lid frame M). An insertion hole 122 is formed in the hinge holding part 120. The hinge of the iron lid F is inserted into the insertion hole 122 in a loose insertion manner.

The personal hole safety work fence body S is installed corresponding to the above-described human hole lid frame M.
Safety work fence S for human holes (See Figs. 2 to 4)
The safety work fence S for the person's hole is
1) An annular lower bottom plate portion 3 having a notch formed in the rear portion and comprising a lower bottom plate 1 and a lower frame rod 2;
2) A plurality of pillars 4 that are erected in an inner diameter direction with a predetermined angle from the lower bottom plate part 3 at a predetermined interval;
3) An annular upper bottom plate portion 7 comprising an upper bottom plate 5 and an upper frame rod 6 fixed to the upper end of the pillar rod 4 in an envelope shape and having a notch in the front portion;
And further includes an intermediate frame rod 8 that extends horizontally between the column rods 2.
The above-mentioned lower bottom plate portion 3, column pole 4, upper bottom plate portion 7 and intermediate frame rod 8 constitute a “fence main body”.
Furthermore, the safety work fence body S for manholes of this embodiment is provided with a locking tool K for fixing the fence body to the manhole.

The detailed structure of each part will be further described below.
Lower bottom plate 3 (lower bottom plate 1 and lower frame ridge 2)
The lower bottom plate portion 3 is formed of an integral combination of the lower bottom plate 1 and the lower frame ridge 2 and has an annular shape, and a lower notch 10 that holds a predetermined width is formed at the rear portion. The lower bottom plate 1 is a metal flat plate and has an annular body with a constant thickness and a constant width, and a lower notch 10 that holds a predetermined width is formed at a rear portion thereof. The outer diameter of the lower bottom plate 1 is substantially equal to or slightly smaller than the outer diameter of the receiving surface 110 of the manhole cover frame M. That is, it is located as close to the wall of the tapered surface 108 as possible.
The lower frame rod 2 is made of a light metal (for example, aluminum) hollow tube, is concentrically and in phase with the lower bottom plate 1 including the lower notch 10, and is fixed to the upper surface of the lower bottom plate 1 by welding or the like. The
The lower bottom plate portion 3 fits into the opening concave portion of the manhole cover frame M in the steady state of the main fence S and fits well on the horizontal receiving surface 110 of the manhole cover frame M via the lower bottom plate 1. That is, it is mounted without rattling. Further, the lower notch 10 of the lower bottom plate portion 3 is arranged at a position facing the hinge holding portion 120 of the human hole lid frame M, and allows the swing range of the iron lid F and the main fence body S is inverted. When given, it gives the worker access space.

Pillar 4
The column rod 4 is formed as a hollow straight circular tube, and is composed of a plurality of columns. The column rod 4 is erected so as to be inclined in the inner diameter direction with a predetermined angle α from the lower bottom plate portion 3 at a constant interval. For this reason, the diameter of the column of the column rod 4 is reduced as it extends upward.
Specifically, the column rod 4 is erected with an interval (in the present embodiment, an equal interval is used) between the lower bottom plate portion 3 with a longitudinal center line passing through the annular center of the lower bottom plate portion 3 as an axis of symmetry. On one side of the target axis of the center line, the end column rods 4a at both ends are mainly used, and two intermediate column rods 4b are arranged in the middle. The end pole 4a also functions as an operator's handle.
Further, the inclination of the pillar 4 in the inner diameter direction takes an appropriate angle α according to the height of the main fence S, but in this embodiment, the height is relatively low, and the inclination is inclined in the inner diameter direction. Take an angle not exceeding 8 °. According to this angle, when the main fence S is reversed, it does not interfere with the angle of the tapered surface 108 of the normal manhole cover frame M.

Upper bottom plate 7 (upper bottom plate 5 / upper frame 6)
The upper bottom plate portion 7 is composed of a combination of the upper bottom plate 5 and the upper frame ridge 6 and has an annular shape, and an upper notch 12 is formed at the front thereof to maintain a predetermined width.
The upper frame rod 6 is a hollow circular tube having an upper notch 12 formed in the front portion, and is fixed to the upper end of the column rod 4 in an envelope shape and concentrically in a horizontal manner.
The upper bottom plate 5 is a metal flat plate having a constant thickness and a constant width. The upper bottom plate 5 includes the upper notch 12 of the upper frame rod 6 and is concentric with and in phase with the upper frame rod 6 on the upper surface of the upper frame rod 6. It is fixed by welding or the like.
The upper bottom plate portion 7 composed of the upper bottom plate 5 and the upper frame ridge 6 has a smaller diameter than the lower bottom plate portion 3 and is concentric with the lower bottom plate portion 3.
Thus, the upper bottom plate 7 serves as a handle for the operator in a steady state of the main fence S, and the upper notch 12 provides an entry / exit space for the operator.
Further, when the main fence body S is inverted, the upper bottom plate portion 7 is placed on the horizontal receiving surface 110 of another small-diameter human hole lid frame M ′. Further, the upper notch 12 is arranged at a desired position on the hinge holding part 120 of the human hole lid frame M ′, and gives a swinging region of the arm part of the iron lid F.

Intermediate frame 8
The intermediate frame rod 8 is formed of a hollow circular tube, and is bridged horizontally in a curved shape between the column rods 4 arranged side by side, in the present embodiment, between the intermediate column rods 4b. The intermediate frame rod 8 serves as a handle of the operator and forms a part of an annular shape in the present embodiment, but may be linear.

  The lower frame rod 2, the column rod 4 and the upper frame rod 6, and the intermediate frame rod 8, which constitute a part of the fence body, are not limited to the aluminum hollow circular tube described above, but are solid members or polygonal members. Further, the material is not limited to aluminum, and other metal materials (for example, stainless steel) are appropriately selected. In short, what is necessary is just to satisfy that the integrated structure of the fence main body of the fence body S comprised by these comprises a firm structure.

Locking tool K (See FIGS. 5 and 6)
The locking tool K has one end engaged with the main body of the fence, the other end engaged with the manhole cover frame M, and tension is introduced into the tension member interposed between the both ends. The main body is attached to the manhole cover frame M.
FIG. 5 shows a locking tool K according to the embodiment.
This locking tool K is
1) A mounting bracket 20 as an upper engagement bracket that is detachably mounted on the upper bottom plate portion 7 of the fence body.
2) A connecting bracket 21 detachably connected to the mounting bracket 20;
3) Rope fixing adjuster 22 connected to the connecting bracket 21;
4) A rope 23 as a tension member that is suspended around the rope fixing adjustment tool 22 and fixed at an arbitrary position.
5) A hook fitting 24 as a lower engagement fitting that is attached to one end of the rope 23 and engages the manhole cover frame M;
Consists of.
In the above members, the connecting fitting 21, the rope fixing adjuster 22 and the rope 23 as the tension member constitute a so-called interposition member.
The connecting fitting 21 can be omitted as appropriate.

(Mounting bracket 20)
The mounting bracket (so-called joint clamp) 20 is an aspect of the upper engagement bracket, and is composed of two split bodies 20a and 20b that are double-opened via pins, and is inserted into the hook-shaped mating portion 20c at the lower end. Has been established. The mounting bracket 20 is attached so as to hold the upper bottom plate portion 7.
(Connecting bracket 21)
A so-called carabiner is used for the connection fitting 21, and the upper ring portion is inserted into the insertion hole of the fitting portion 20 c of the mounting bracket 20, and the lower ring portion is the rope fixing adjustment tool 22. The pin 22a is dive and engaged.
(Rope fixing adjuster 22)
The rope fixing adjuster (so-called rope pratchet) 22 has a known configuration, and allows the rope to be fed only in one direction by a ratchet mechanism arranged therein, and restricts the feeding in the reverse direction. The restraint is released by operating the release lever, and reverse feed is allowed.
(Rope 23)
The rope 23 is an embodiment of a tension member, and an intermediate portion thereof is inserted into the rope fixing adjuster 22, one end is extended outward from the rope fixing adjuster 22, and the other end is fixed to the rope. The adjustment tool 22 extends downward.
(Hook fitting 24)
The hook fitting 24 is an embodiment of the lower engaging member, and is formed into a bowl shape by bending a metal flat plate, the upper part is connected to the rope 23, and the lower part is a lower surface of the shelf 112 of the manhole cover frame M (so-called The jaw part) is engaged with the hook-like part 24a.

In the use of this locking tool K, the connecting fitting 21, the rope fixing adjusting tool 22, the rope 23, and the hook fitting 24 are connected in series.
First, the mounting bracket 20 is attached to the upper bottom plate portion 7. Next, the connecting body of the connecting fitting 21, the rope fixing adjuster 22, the rope 23, and the hook 24 is engaged with the connecting fitting 21 through the insertion hole of the mounting fitting 20, and the hook fitting 24 is The lower end of the shelf portion 112 of the manhole cover frame M is engaged through the hook-shaped portion 24a, and the outer end portion of the rope 23 is pulled outward with a tensile force.
As a result, a tensile force is introduced into the rope 23 between the rope fixing adjuster 22 and the hook fitting 24, and the fence body is pressed downward, that is, against the manhole cover frame M via the connecting fitting 21 and the attachment fitting 20, and the fence body Is fixed.
For the removal of the lock K, the release lever of the rope fixing adjustment tool 22 is operated to release the rope 23 from the ratchet, loosen the rope 23, and remove the hook 24 from the manhole cover frame M. .

FIG. 6 shows another hook member 25 of the lower engaging member. That is, when the protrusion width of the shelf 112 of the manhole cover frame M is small, the hook metal fitting 24 may not be engaged, but this aspect corresponds to this situation.
The hook-like metal fitting 25 of the lower engaging member has a hook shape or a hook shape made of hard metal, and the radiating arm 25a is arranged radially in three or four directions (three directions at equal intervals of 120 ° in this embodiment). When the pointed portion of the tip of the radiating arm 25a is engaged with the lower surface of the shelf 112 of the manhole cover frame M, and the protrusion width of the shelf 112 of the manhole cover frame M is small due to its locking action. Also corresponds well.

Although it has been described above that the connection fitting 21 is omitted as appropriate, other members are also omitted or modified, and other members are used as appropriate. In short, the intended function of the locking tool K, that is, one end is engaged with the fence body, the other end is engaged with the manhole cover frame M, and tension is applied to the tension member interposed between these both ends. What is necessary is just to perform the function in which force is introduced and the fence main body is attached to the manhole cover frame M.
1) The rope 23 can take a strong belt-like member so-called belt mode, and the rope fixing adjuster 22 can be replaced with a belt fastening device (so-called buckle).
2) It is also possible to substitute a turnbuckle or a rubber belt for the connecting fitting 21, the rope fixing adjustment tool 22 and the rope 23.

(Operation of this embodiment)
The human-hole safety work fence body S having the above-described configuration is installed by being fitted into the opening recesses (108, 110) of the opened human-hole cover frame M, and then the personal hole safety work fence body S. Is fixed to the manhole cover frame M or the manhole by the locking tool K.
The fixed manhole safety work fence body S serves as a mark of traffic, and aims at safety of passers-by and vehicles. Further, the worker enters and exits the human hole through the notch 10 of the installed safety work fence body S.
Then, the other person hole cover frame M ′ is reversed and used for the person hole safety work fence body S.
This will be specifically described below.

Installation of the safety work fence body S for the personal hole When the safety work fence body S for the personal hole is installed, the iron cover F (not shown) of the human hole is opened. In this embodiment, the hinge of the iron cover F is loosely inserted into the insertion hole 122 of the hinge holding part 120 of the human hole cover frame M. After the iron cover F is lifted, the hinge of the iron cover F is It is released by rotating 180 ° horizontally around the center of rotation.
Thereafter, the lower bottom plate portion 3 of the safety work fence body S is placed on the receiving surface 110 of the shelf portion 112 of the opened manhole cover frame M. At this time, the rear portion of the safety work fence body S, that is, the rear portion of the lower bottom plate portion 3 has a wide notch 10, and the notch 10 is a hinge of the iron lid F and further a part of the iron lid F. It is installed across.
Next, the mounting bracket 20 of the locking tool K is fitted to the upper bottom plate portion 7 of the main body of the safety work fence body S.
Further, in a series of prepared fittings 21, rope fixing adjusters 22, ropes 23, and hooks 24, the fittings 21 are engaged with the fittings 20.
The hook 24 is engaged with the concave portion of the manhole cover frame M, and then the rope 23 is squeezed to apply tension to the rope 23 between the mounting bracket 20 and the hook 24. At this time, the rope fixing adjustment tool 22 is held by the built-in ratchet mechanism without loosening the tension of the rope 23.
The locking tool K is attached at least at two locations on the main body of the safety work fence body S.
As a result, the front part of the safety work fence body S corresponds to the position where the footrests (also referred to as steps) of the human holes are arranged, and the safety work fence body S is installed without backlash. The fence body S is fixed.
When removing the safety work fence S, the release lever of the rope fixing adjuster 22 is operated to release the rope 23 from the ratchet, loosen the rope 23, and remove the hook 24 from the manhole cover frame M. Remove.

Usage Mode of the Installed Safety Work Fence Body S for Personal Holes The safety work fence body S for personal holes that is installed serves as a mark of passage, and aims at safety of passers-by and vehicles.
Further, the operator enters and exits the human hole through the upper notch 12 at the front portion of the safety work fence body S for the user's hole.
In the entry hole, the operator enters from the upper notch 12 at the front of the safety work fence body S, and appropriately holds the upper bottom plate part 7, the column fence 4 or the intermediate frame fence 8 of the safety work fence body S. While descending the human hole through the footrest in the human hole.
In the exit hole, when the worker ascends the inside of the human hole through the footrest in the human hole and reaches the opening of the human hole, the intermediate frame rod 8 and the column rod 4 of the safety work fence body S are appropriately arranged. Or, the upper bottom plate portion 7 is gripped, and a hole is made from the upper notch 12 in the front portion of the safety work fence body S.

Inversion Use The safe work fence body S of the present embodiment is applied to another manhole cover frame M ′ having a different diameter, that is, the outer diameter of the receiving surface 110.
That is, when the diameter of the manhole cover frame M ′ is smaller than the diameter of the previous manhole cover frame M, the safety work fence body S is inverted and used.
Specifically, the upper bottom plate portion 7 is lowered by the reversal of the safety work fence body S, and the upper bottom plate portion 7 is fitted into the opening recess of the human hole lid frame M ′, and the shelf portion 112 of the human hole lid frame M ′. Is placed on the receiving surface 110. In this case, the upper notch 12 is arranged at the rear part so as to straddle the hinge holding part 120 of the human hole lid frame M ′.
Further, the lower bottom plate portion 3 of the safety work fence body S is on the upper side, the lower notch 10 is arranged on the front portion, and the width thereof is sufficiently wide to provide a space for the worker to enter and exit.
Then, with the locking tool K, the upper mounting bracket 20 is attached to the lower bottom plate portion 3 of the fence body, the lower hook 24 is engaged with the manhole cover frame M ′, and the safety work fence body S is The fixing is in accordance with the above description.

(Effect of this embodiment)
According to the safety work fence body S for manholes of this embodiment, since the fence body itself is installed in the opening recess of the manhole cover frame M, stability is ensured. Furthermore, it is firmly and reliably installed by the locking tool K.
By installing the safety work fence body S for manholes, traffic safety can be achieved, and the safety of entering and exiting workers through the safety work fence body S for manholes can be ensured.
Further, by reversing the safety work fence body S for the personal hole, it is possible to cope with the small-diameter human hole cover frame M ′, and the installation procedure and the use mode are not changed from the steady state. The scope of application can be expanded.

Other Aspects The safety work fence body S for manholes according to the present embodiment takes a relatively low aspect and is normally applied to management work, but is dedicated to work in the manhole. In the case of (1), an aspect with high height is adopted. In the safety work fence S for manhole work, the angle α is made steeper.

Construction method A new construction method (method) for manhole construction is created by utilizing the reversibility characteristic of the safe work fence body S of the present embodiment.
That is, the safety work fence body S of the present embodiment is used in correspondence with the two types of human hole cover frames M and M ′ having different inversions. The use value is great when it is used corresponding to.
In other words, the human hole cover frame in one area occupies the majority with the two types of human hole cover frames M and M ′ in the standard product, and can almost correspond with the two types of human hole cover frames M and M ′. Is slight.
It is as follows when this is seen about the manhole cover frame of nominal diameter (PHI) 600mm.
In the area A, two types of the human hole cover frame M having an outer diameter of the shelf 112 of the opening recess of 654 mm and the human hole cover frame M ′ having the same diameter of 607 mm occupy the majority. Accordingly, in this safety work fence body S, the outer diameter of the lower bottom plate portion 3 is 652 ± 2 mm, and the outer diameter of the upper bottom plate portion 7 is 605 ± 2 mm.
In the region B, two types of the manhole cover frame M having an outer diameter of the shelf 112 of the opening recess of 630 mm and the manhole cover frame M ′ having the same diameter of 620 mm are dominant.
Accordingly, in this safety work fence body S, the outer diameter of the lower bottom plate portion 3 is 628 ± 2 mm, and the outer diameter of the upper bottom plate portion 7 is 618 ± 2 mm.
In the area C, two types of the manhole cover frame M having an outer diameter of the shelf 112 of the opening recess of 640 mm and the manhole cover frame M ′ having 607 mm are dominant. Accordingly, in this safety work fence body S, the outer diameter of the lower bottom plate portion 3 is 638 ± 2 mm, and the outer diameter of the upper bottom plate portion 7 is 605 ± 2 mm.

  Now, when there is a manhole construction in the A area, the safety work fence body S of a predetermined size prepared for the A area is transported to the site, and this safety work fence body is whatever the diameter of the manhole. It can be mounted by placing S or placing it in reverse. In this way, one kind of safety work fence body S can cope with all the human holes in the area A, and it is not necessary to check the diameter of the human hole every time, and the manhole work can be dealt with accordingly. The speed can be increased, and the production cost of the safety work fence S can be greatly reduced.

(Other embodiment) (refer FIG. 7)
The human hole lid frames M and M ′ in the previous embodiment are such that the wall surface of the concave portion of the opening is tapered (conical surface) or straight wall shape (cylindrical surface). Some take the shape.
As shown in part in FIG. 7, in the human hole lid frame N, the inner peripheral surface of the main body 100 ′, that is, the opening recess, is formed on the upper wall surface 108 ′ having a conical surface and the upper wall surface 108 ′. It comprises a curved receiving surface 110 that is continuously connected.
The outer surface of the iron cover F (not shown, only the reference numeral) is formed in a curved surface that matches the inner peripheral surface of the main body of the human hole cover frame N, and the iron cover F is formed on the main body of the human hole cover frame N. Fits closely to the inner surface.

The safety work fence body S ′ for manholes of the present embodiment (second embodiment) has substantially the same configuration as the safety work fence body S for manholes of the previous embodiment, but its lower part. The lower bottom plate 1 ′ of the bottom plate portion 3 ′ is formed in a curved surface that matches the opening recess of the human hole lid frame N (large diameter), and the upper bottom plate 6 ′ (only the symbol) of the upper bottom plate portion 7 ′ (only the symbol). ) Is formed in a curved surface that matches the opening concave portion of the other human hole lid frame N ′ (small diameter) (symbol only). The lower frame ridge 2 ′ is fixed on the upper surface of the lower bottom plate 1 ′, and the upper frame ridge 5 ′ (only the reference numeral) is fixed on the lower surface of the upper bottom plate 6 ′, which is the same as the previous one.
In the safety work fence body S ′ for the person's hole, the upper bottom plate portion 7 ′ may correspond to the person hole cover frame M shown in the first embodiment.

  The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the basic technical idea of the present invention.

  S ... Safety work fence for manhole, M, M ', N ... Human hole lid frame, K ... Locking tool, 1 ... Lower bottom plate, 2 ... Lower frame rod, 3 ... Upper bottom plate portion, 4 ... Pillar rod, 5 ... Upper frame trough, 6 ... Upper bottom plate, 7 ... Upper bottom plate portion, 10 ... Lower notch, 12 ... Upper notch, 108 ... Tapered surface, 110 ... Receiving surface

Claims (5)

A safety work fence body for a human hole that is placed on a receiving surface in an opening concave portion of two types of circular human hole lid frames with different diameters that are opened and reversibly attached to the human hole lid frame. ,
A notch is formed in the rear part, and an annular lower bottom plate part placed in contact with the receiving surface in the opening recess of the one human hole lid frame,
A plurality of pillars erected in a row in an inner diameter direction from the lower bottom plate,
A notch is formed in the front part, and an annular upper bottom plate part fixed on the upper part of the pillar and fixed in contact with the receiving surface in the opening recess of the other manhole cover frame, Consists of
The both notches maintain a width space for workers to enter and exit,
The outer diameter of the lower bottom plate portion corresponds to a large-diameter human hole lid frame, the outer diameter of the upper bottom plate portion corresponds to a small-diameter human hole lid frame,
The lower and upper bottom plate portions are composed of a bottom plate body that directly contacts the receiving surface of the human hole lid frame and a frame rod fixed to the bottom plate body.
A safety work fence for human holes.   The safety work fence for manhole according to claim 1, wherein the receiving surface in the opening recess of the manhole cover frame is a horizontal surface.   One end is engaged with the main body of the fence excluding the bottom plate portion that abuts the manhole cover frame, the other end is engaged with the main body portion of the manhole cover frame or the manhole, and the tension member disposed between these both ends The safety work fence body for manholes according to any one of claims 1 and 2, further comprising a locking tool into which traction force is introduced. A safety work fence body for a human hole that is placed on a receiving surface in an opening concave portion of two types of circular human hole lid frames with different diameters that are opened and reversibly attached to the human hole lid frame. ,
A notch is formed in the rear part, and an annular lower bottom plate part placed in contact with the receiving surface in the opening recess of the one human hole lid frame,
A plurality of pillars erected in a row in an inner diameter direction from the lower bottom plate,
A notch is formed in the front part, and an annular upper bottom plate part fixed on the upper part of the pillar and fixed in contact with the receiving surface in the opening recess of the other manhole cover frame, Consists of
The both notches maintain a width space for workers to enter and exit,
The outer diameter of the lower bottom plate portion corresponds to a large-diameter human hole lid frame, the outer diameter of the upper bottom plate portion corresponds to a small-diameter human hole lid frame,
The lower and upper bottom plate portions are composed of a bottom plate body that directly contacts the receiving surface of the manhole cover frame and a frame rod fixed to the bottom plate body,
The large-diameter human hole lid frame and the small-diameter human hole lid frame are selected from two types of standards that occupy most in a specific area.
A safety work fence for human holes. A safety work fence body for a human hole that is placed on a receiving surface in an opening concave portion of two types of circular human hole lid frames with different diameters that are opened and reversibly attached to the human hole lid frame. ,
A notch is formed in the rear part, and an annular lower bottom plate part placed in contact with the receiving surface in the opening recess of the one human hole lid frame,
A plurality of pillars erected in a row in an inner diameter direction from the lower bottom plate,
A notch is formed in the front part, and an annular upper bottom plate part fixed on the upper part of the pillar and fixed in contact with the receiving surface in the opening recess of the other manhole cover frame, Consists of
The both notches maintain a width space for workers to enter and exit,
The outer diameter of the lower bottom plate portion corresponds to a large-diameter human hole lid frame, the outer diameter of the upper bottom plate portion corresponds to a small-diameter human hole lid frame,
The lower and upper bottom plate portions are composed of a bottom plate body that directly contacts the receiving surface of the manhole cover frame and a frame rod fixed to the bottom plate body,
The large-diameter manhole cover frame and the small-diameter manhole cover frame use a safety work fence for manholes selected from two kinds of standards occupying most in a specific area,
Attach it to the open circular human hole lid frame to carry out human hole work.
A construction method for human hole construction characterized by this.

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