JP2000291035A - Fall prevention inside-cover of underground structure cover and holding frame having fall-prevention inside cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention inside-cover of an underground structure cover and a holding frame having the fall-prevention inside-cover capable of maintaining a loading state of the fall prevention inside-cover capable of facilitating the loading thereof to the holding frame even when the cover main body is opened by uplift pressure. SOLUTION: A fall prevention inside-cover 4 of an underground structure cover is capable of being detached to a holding frame 2 for overhanging projections 3 to the inside circumferenctial surface, and the fall prevention inside-cover 4 includes a plurality of interlocking devices 7 and 8 mounted on the projections 3, fixed members provided so as to interlock with the lower surfaces of the projections 3, interlocking members 26 capable of being displaced to interlocking positions for interlocking with the lower surfaces of the projections 3 and releasing positions for releasing interlocks and holding members 27 positioning the interlocking members 26 at the interlocking positions. The fixed members and interlocking members 26 are so arranged that the fall prevention inside-cover 4 can not be separated from the holding frame 2 when the interlocking members 26 are positioned to the interlocking positions in a state to load the fall prevention inside-cover 4 to the holding frame 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents an operator or a pedestrian from falling into an opening or dropping an article when the lid body of an underground structure lid is opened to inspect the inside of a manhole. TECHNICAL FIELD The present invention relates to a fall prevention middle cover of a cover for an underground structure and a receiving frame provided with the fall prevention middle cover. The term “cover for underground structures” as used herein refers to a large iron cover, a manhole cover, a sewage basin cover, an electric power / Opening / closing iron lids for joints that can be opened and closed to protect underground facilities equipment and underground cables in communications, iron lids for power transmission, iron lids for power distribution, buried conduits under the road surface for water supply and gas piping, and their attached equipment and the ground. Fire hydrant cover, water control valve cover, partition valve cover, air valve cover, gas pipe cover, water meter cover, etc., which function as an opening / closing door.

[0002]

2. Description of the Related Art Conventionally, as a fall prevention middle lid of a cover for an underground structure, for example, Japanese Unexamined Utility Model Publication No. 4-138441 discloses a fall prevention middle lid that can be attached to and detached from a mounting seat provided on the inner peripheral surface of an opening of a receiving frame. The structure comprises a mesh-shaped lid body and a locking member for locking to a mounting seat of a receiving frame, and a wing bolt provided on the locking device is engaged with an inner peripheral surface of the receiving frame below the mounting seat. By combining them, the lid main body is prevented from sticking.

[0003] In the fall prevention inner lid having the above structure, the wing bolt is in contact with the inner peripheral surface of the receiving frame below the mounting seat, so that even when a biased load is applied, the lid body does not stick, and the underground structure (manhole) is not provided. Even if the lid body is opened by the lifting pressure generated in the parentheses), the lid does not come off during fall prevention, so that it is possible to prevent a pedestrian from falling into the underground structure.

[0004]

However, when the worker enters the underground structure, the wing bolt is loosened to remove the fall prevention cover, and after the work, the fall prevention cover is attached and the wing bolt is tightened again. The operation is cumbersome, and the wing bolt may be loosened due to the vibration of the passing vehicle or the like, and the wing bolt may not contact the inner peripheral surface of the receiving frame below the mounting seat, or the user may forget to tighten the wing bolt.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is intended to be easily mounted on a receiving frame, and to be able to maintain a mounted state even if the lid body is opened by lifting pressure. An object of the present invention is to provide a receiving frame provided with an inner cover for preventing and a fall prevention inner cover.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a fall prevention middle cover for an underground structure cover which can be attached to and detached from a receiving frame having an overhanging portion on the inner peripheral surface thereof. A plurality of locking tools mounted on the overhang portion, a fixing member provided to engage with a lower surface of the overhang portion, and an engagement position engaging with the lower surface of the overhang portion. A locking member that can be displaced to a release position where the engagement is released, and a holding member that positions the locking member at the engagement position, wherein the fixing member and the locking member are provided with the lid during fall prevention. In a state where the locking member is located at the engagement position in a state where the cover is mounted on the receiving frame, the fall prevention inner cover is arranged so as not to be detached from the receiving frame.

[0007] A cover for preventing a fall of a lid for an underground structure detachable from a receiving frame formed with an overhanging portion projecting from the inner peripheral surface and a concave mounting seat opened to the inner peripheral surface. The fall prevention middle cover is engaged with a locking member placed on the overhang portion and a fixing member engaging with the lower surface of the overhang portion or an engagement position engaging with the lower surface of the overhang portion. A first locking member that can be displaced to a release position at which is released, and an engagement position that can be placed on the bottom surface of the concave mounting seat and engages with the upper surface of the concave mounting seat. A second locking member displaceable to a release position where the first and second locking members are displaced to an engagement position, and a holding member for positioning the first and second locking members at respective engagement positions. The locking member and the second locking member
In a state in which the fall prevention inner lid is mounted on a receiving frame, the fall prevention intermediate lid is arranged so as not to be detached from the receiving frame when each of the locking members is located at the engagement position. I do.

[0008] A fall prevention inner lid for an underground structure lid which is detachable from a receiving frame formed with an overhanging portion protruding on the inner peripheral surface and a concave mounting seat opened on the inner peripheral surface. The fall prevention middle lid is displaceable between a locking tool placed on the overhang portion, an engagement position for engaging the lower surface of the overhang portion, and a release position for releasing the engagement. And an engaging member that can be mounted on the bottom surface of the concave mounting seat and that can be mounted on the bottom surface of the concave mounting seat. A second position displaceable between an engagement position for engaging the upper surface of the mounting seat and a release position for releasing the engagement;
And a holding member for positioning the first and second locking members at respective engagement positions. The first locking member, the engagement member or the second locking member, In the state in which the fall prevention middle lid is attached to the receiving frame, the fall prevention middle lid is arranged so as not to be detached from the receiving frame when each of the locking members is located at the engagement position. Features.

[0009] Further, a fall prevention middle lid of an underground structure cover detachable from a receiving frame formed with a concave mounting seat opened to the inner peripheral surface, wherein the fall prevention middle lid is a bottom surface of the concave mounting seat. A plurality of locking members that can be placed on the portion and can be displaced between an engagement position where the upper surface portion of the concave mounting seat is engaged and a release position where the engagement is released, or a bottom surface portion of the concave mounting seat A locking member displaceable between an engagement position for engaging with the upper surface of the concave mounting seat and a release position for releasing the engagement, and a mounting member which can be mounted on the bottom surface of the concave mounting seat. And an engaging member engageable with the upper surface of the concave mounting seat, and a holding member for positioning the engaging member at the engaging position, wherein the engaging member, or the engaging member and the engaging member, In a state where the fall prevention middle lid is mounted on a receiving frame, the locking member is Wherein the fall prevention in the lid are arranged so as not detached from the receiving frame when located at the engagement position.

In each of the above constructions, in the state where the fall prevention inner lid is mounted on the receiving frame, the locking member is placed on the overhanging portion, and the fixing member or the locking member is engaged with the lower surface of the overhanging portion. Further, the engaging member or the locking member is placed on the bottom surface of the concave mounting seat, and the engaging member or the locking member is engaged with the upper surface of the concave mounting seat. As a result, even when the lid body is opened due to the lifting pressure in the underground structure, the fall prevention inner lid does not separate from the receiving frame, so the state in which the fall prevention intermediate lid is attached to the receiving frame should be maintained. Can be. On the other hand, when removing the fall prevention inner lid from the receiving frame at the time of inspection or the like in the underground structure, the engagement between the locking member and the mounting seat or the concave mounting seat is released.

[0011]

In the present invention, the holding member is formed of an elastic member, and the locking member is rotatably supported on the shaft. The locking member is urged to the engagement position by the elastic member. Configuration. Further, the holding member is formed of an elastic member, and the locking member is slidable horizontally with respect to the fall prevention lid in the installed state, and the locking member is urged to the engagement position by the elastic member. It can also be configured.

With this configuration, the locking member is always located at the engagement position when the fall prevention lid is mounted on the receiving frame, so that the locking member is prevented from being forgotten to be hooked. be able to. Further, the holding member may be configured by a fastening member, and the locking member may be configured to be held at the engagement position by the fastening member.

[0013] With this configuration, the fall prevention lid can be securely held in the mounted state.
It is possible to reliably prevent a person other than the worker from opening the lid during fall prevention. 8. The receiving frame according to claim 1, wherein the receiving frame provided with the fall prevention inner lid is formed on a receiving frame formed with a protruding portion protruding on the inner peripheral surface and / or a concave mounting seat opened on the inner peripheral surface. The under cover of the underground structure described in the paragraph is fitted with a fall prevention inner cover.

[0014] With this configuration, even if the lid body is opened due to a lifting pressure generated inside the underground structure, the fall prevention lid is held by the receiving frame and does not come off.
It is possible to reliably prevent a pedestrian or the like from falling into the underground structure. (Embodiment 1) FIG. 1 is a plan view of a fall prevention inner cover of a cover for an underground structure according to the present invention and a receiving frame provided with the cover, FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 4 is a plan view of the fall prevention inner cover of FIG. 1, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, and FIG. FIG. 6 is an exploded perspective view of a locking mechanism provided below the locking tool of FIG.

In FIG. 1, a cover 1 for an underground structure includes a receiving frame 2
And a lid body (not shown) that is openably and closably mounted on the receiving frame 2, and has a circular shape in plan view, and the lid body is installed so as to be flush with the ground surface. When the lid is opened, the lid body is pulled out of the receiving frame 2 and horizontally pivoted through a hinge mechanism including a hinge seat 15 provided on the receiving frame 2 and a hinge (not shown) provided on the lid body. Or it is opened by vertical inversion.

The receiving frame 2 is formed with a plurality of mounting seats 3 as projections on the inner peripheral surface 2a along the circumferential direction, for example, protruding in an arcuate shape at six locations at equal intervals. 3
a is formed. The hinge seat 15 provided on the receiving frame 2
On the left and right sides, hand grips 16 and 16 are formed as overhang portions that are gripped when the worker enters and exits the manhole.

As shown in FIGS. 3 and 4, the fall prevention inner lid 4 has a ladder shape, and includes left and right side rods 5, 5 and a plurality of horizontal rods 6 connecting the side rods 5, 5. A locking tool 7 fixed to one end of the side rod 5 and mounted on the mounting seat 3, a locking tool 8 fixed to the other end of each side rod 5 and mounted on the handgrip 16, and a handgrip 16 And a projecting frame 10 projecting laterally at substantially the center position of each side rod 5.

As shown in FIG. 4, the locking member 8 and the fixing member 9 are integrally formed in a bifurcated shape substantially parallel to the top and bottom, and the upper locking member 8 and the lower fixing member 9 are formed integrally. And the handgrip 16 is positioned between them. The locking tool 8 has a base end placed on the handgrip 16 and a tip end formed on the protrusion 3 a of the mounting seat 3.
When the fall prevention lid 4 is laterally displaced, it is locked by the projection 3a to prevent the fall prevention lid 4 from coming off. The fixing member 9 is formed to be shorter than the locking member 8 and is opposed to the lower surface of the handgrip 16 with a slight gap, and engages with the lower surface of the handgrip 16 when the lid 4 floats during the fall prevention. This prevents the fall-off prevention lid 4 from falling off.

If there is no possibility that the lid 4 will shift sideways during the fall prevention, the locking member 8 may be formed to have the same length as the fixing member 9. The fall prevention inner lid mounted on the receiving frame of the type not provided with the handgrip 16 has a fixing member 9 formed on the lower surface of the mounting seat 3 with the same length as the locking tool 8 mounted on the mounting seat 3. What is necessary is just to comprise so that it may engage. The locking member 7 fixed to one end of the side rod 5 of the fall prevention inner cover 4 is shown in FIG.
As shown in FIG. 7, the upper plate 7a is composed of an upper plate 7a and a side plate 7c, and the base end of the upper plate 7a is located substantially at the center of the upper end of the side plate 7c.
Has a tip protruding from the side plate 7c to form a hook 7b. These hooks 7b extend to the side of the projection 3a when the tip of the upper plate 7a is placed on the mounting seat 3. Locked by the portion 3a, the fall prevention lid 4 is prevented from coming off.

The side plate 7c includes a bolt 21 and a nut 2
2 to the end of the side rod 5 and
The nut 23 is fastened and fixed together with the side rod 5 and the distal end of the overhang frame 10 by a nut 23. Further, a bottom plate 7d is formed on one of the locking members 7 from the lower end of the side plate 7c so as to face the upper plate 7a, and a screw hole 7e is formed substantially at the center of the upper plate 7a. The hole 7f is located at a position coaxial with the hole 7e.
Is formed. A locking mechanism 25 is provided between the upper plate 7a and the bottom plate 7d as shown in FIGS.

As shown in FIG. 6, the locking mechanism 25 includes a lock plate 26 as a locking member, a torsion coil spring 27 as an elastic member, and a bolt 28. The lock plate 26 has a substantially rectangular shape in plan view,
One side is a lock portion 26a and the other side is an operation portion 26b. Support pieces 26c and 26d which are bent at substantially right angles inward with respect to the lock portion 26a at the upper and lower ends substantially in the center and have a substantially U shape are formed.
Are formed. The lock portion 26a has an inclined portion 26f whose upper end portion 26e forms a horizontal plane and whose lower end surface is inclined obliquely downward from the distal end toward the lower support piece 26d. The upper end 26e of the lock 26a is set lower than the upper surface of the upper support piece 26c by a predetermined height h. The height h is set slightly larger than the thickness of the mounting seat 3. Further, a small hole 26g is provided substantially at the center of the lock portion 26a.

The operating portion 26b has a distal end portion 26h that is
6c and 26d, they are bent at a substantially right angle on the same side, and a cutout 26i is provided at the upper end corner. This notch 26
“i” is for the operator to put a finger when rotating the lock plate 26. The notch 26i is not always necessary. The upper and lower support pieces 26c, 26d
Holes 26j and 26k which can be fitted between the upper plate 7a and the bottom plate 7d of the locking member 7 and communicate with the screw holes 7e and 7f are formed. The torsion coil spring 27 includes a bolt 28
Can be loosely fitted, one end 27a is bent outward in the axial direction, and the other end 27b is bent laterally at substantially a right angle.

The lock plate 26 is provided on the upper plate 7 of the locking member 7.
a and the torsion coil spring 27
Is housed between the support pieces 26c and 26d and one end 27
a is locked by a locking portion 7g formed on the bottom plate 7d of the locking tool 7, and the other end 27b is inserted and locked into a small hole 26g of the lock plate 26. The bolt 28 has a hole 7 f from below the bottom plate 7 d of the locking member 7, a hole 26 k of a support piece 26 d of the lock plate 26, a torsion coil panel 27, and a lock plate 26.
Threaded through the hole 26j of the support piece 26c.
8a is screwed into the screw hole 7e of the upper plate 7a of the locking member 7.
Thus, the lock plate 26 and the torsion coil spring 27 are assembled to the locking member 7.

The lock plate 26 is rotatable in a horizontal plane with the bolt 28 as a rotation axis when assembled to one of the locking members 7, and is counterclockwise by the spring force of the torsion coil spring 27 as shown in FIG. Biased in the direction
The end surface 26h 'of the distal end portion 26h of the operation portion 26b is
0 and is locked by abutting on the leading end. In this state, in the lock plate 26, the lock portion 26a is located below the tip of the upper plate 7a of the locking member 7, and the upper end 26e has a substantially interval h with the lower surface of the upper plate 7a as shown in FIG. Facing each other. Further, the operation section 26b is located behind the base end of the upper plate 7a, and the space between the operation portion 26b and the upper plate 7a is vertically opened. This position of the lock plate 26 is a lock position (engagement position) where the lock plate 26 is engaged with the lower surface of the mounting seat 3.
The finger is put on the notch 26i of b and rotated clockwise against the spring force of the torsion coil spring 27, whereby the lock position is operated from the lock position to the unlock position (release position).

Since the upper portion of the operation portion 26b of the lock plate 26 is open, even if the lift in the manhole hits the upper plate 7a from below, the upper portion 7b does not act on the operation portion 26b. Is prevented from being located at the unlock position. Next, the state of attachment of the fall prevention inner lid 4 to the receiving frame 2 and a method of attaching and detaching the same will be described.

As shown in FIGS. 1 and 2, when the fall prevention lid 4 is mounted on the receiving frame 2, the base end of the locking tool 8 is placed on the handgrip 16 and the distal end is mounted on the mounting seat 3. The fixing member 9 is positioned below the handgrip 16 so that the fixing member 9 engages with the lower surface of the handgrip 16. On the other hand, as shown in FIG. 5, FIG. 7 and FIG. 9, the locking member 7 of the side rod 5 is mounted on the mounting seat 3 from the substantially center of the upper plate 7a and provided on one of the locking members 7. The lock plate 26 is urged to rotate to the lock position by the spring force of the torsion coil spring 27, and the tip of the lock portion 26 a enters the lower side of the mounting seat 3 of the receiving frame 2. At this time, the upper end portion 26e of the lock portion 26a faces the lower surface of the mounting seat 3 with a slight gap d.

In this state, when the fall prevention lid 4 is pushed up by, for example, the lifting pressure in the manhole, the fixing member 9 is engaged with the handgrip 16 on the locking member 8 side, and the locking member 7 is on the locking member 7 side. , Lock plate 26 engages with mounting seat 3. Therefore, a temporary increase in the amount of rainfall causes a lifting pressure in the manhole, so that the lock (both not shown) provided on the lid body attached to the receiving frame 2 comes off from the receiving frame 2 to open the lid. Even in this case, the falling off of the lid 4 during fall prevention can be prevented, and it is possible to prevent a pedestrian or the like from falling into the manhole.

When removing the fall prevention lid 4 from the receiving frame 2, the operator inserts a finger into the operating portion 26b of the lock plate 26 of the locking member 7, and hooks the fingertip on the notch 26i (FIGS. 6 and 7). Then, the lock portion 26a is disengaged from below the mounting seat 3 by rotating the lock portion 26a clockwise to a lock release position shown by a two-dot chain line in FIG.
Thereby, the lock by the lock plate 26 is released. Next, while holding the lock plate 26 in the unlocked state, the operator lifts the locking tool 7, pulls out the locking tool 7, pulls out the engagement, releases the engagement between the handgrip 16 and the fixing member 9, and prevents the falling from the receiving frame 2. Remove the lid 4. Lock plate 2
6 returns to the locked position by the spring force of the torsion coil spring 27 when the operator releases his / her fingertip from the notch 26i.

When attaching the fall prevention lid 4 to the receiving frame 2, an operator places the base end of the locking tool 8 on the handgrip 16,
The fixing member 9 is placed under the handgrip 16, and then the lid 4 is gradually lowered while the fall prevention is being performed, and the locking member 7 is placed on the mounting seat 3. As shown in FIG. 8, the lock plate 26 has a lower end surface of a lock portion 26a formed as an inclined portion 26f, and is inclined with respect to the edge of the mounting seat 3 of the receiving frame 2 at the lock position as shown in FIGS. , The inclined portion 26f of the lock portion 26a is moved downward by the fall of the lid 4 during fall prevention.
5 is gradually rotated clockwise to an unlock position shown by a two-dot chain line in FIG. 5 against the spring force of the torsion coil spring 27, and the upper plate 7a of the locking member 7 is mounted. Immediately before being placed on the upper surface of the seat 3, the lock portion 26a gets over the mounting seat 3 and returns to the locked position indicated by the dotted line in FIG. 5 by the spring force of the torsion coil spring 27. As a result, the lock plate 26 engages with the lower surface of the mounting seat 3 of the receiving frame 2 to prevent the lid 4 from rising during the fall prevention.

The locking member 7 is mounted on the handgrip 16 and the lock plate 26 is engageable with the lower surface of the handgrip 16. The locking member 8 is mounted on the mounting seat 3 and the fixing member 9 is mounted. You may comprise so that it can engage with the lower surface of the mounting seat 3. Also, the lower end 26f of the lock plate 26
It is not always necessary to make it an inclined surface. Of course, in this case, the worker mounts the lock plate 26 on the mounting seat 3 while rotating the lock plate 26 to the unlocked position.

(Embodiment 2) FIGS. 10 to 12 show a second embodiment of the present invention. The same or corresponding members as those of the first embodiment shown in FIGS. 1 to 9 are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIGS. 10 and 12, the locking mechanism 30 includes a lock plate 3 as a locking member.
1 and a spring 32 as an elastic member. A substantially central portion of the lock plate 31 is rotatably supported in a vertical plane by a bolt 33 on a side plate 7c of the locking member 7, and a distal end thereof is a lock portion 31a. On the upper surface of the lock portion 31a, an operation portion 31b for hanging a finger is formed so as to horizontally project outward. In addition, the lower surface of the lock portion 31a is an inclined surface 31c that is obliquely inclined from the distal end toward the lower surface of the central portion.

The spring 32 has one end locked to a pin 34 fixed to the base end side of the lock plate 31 and the other end locked to a pin 35 fixed to the side plate 7c of the locking member 7. The lock plate 31 is pulled and held at a lock position parallel to the upper plate 7a of the locking member 7. A stopper bolt 36 is screwed to the upper plate 7a of the locking member 7 so as to face the base plate side upper surface of the lock plate 31, and the lock plate 31 is brought into contact with the lock plate 31 so that the lock plate 31 is brought into contact therewith. Rotation from the lock position counterclockwise is prevented. In the state shown in FIG. 11 in which the lid 4 is attached and the upper plate 7 a of the locking member 7 is placed on the mounting seat 3 of the receiving frame 2, the lock portion 31 a is located on the lower surface of the mounting seat 3. , And is prevented from falling off even if the lid 4 is pushed up by the lifting pressure or the like in the manhole during fall prevention.

When removing the fall prevention lid 4 from the receiving frame 2, an operator inserts a finger below the operating portion 31b of the lock plate 31, and resists the spring force of the spring 32 as shown by an arrow in FIG. 31 is rotated upward, the lock portion 31a is removed from below the mounting seat 3 of the receiving frame 2, and the lock is released. Note that the lock portion 31a of the lock plate 31 faces the lower surface of the mounting seat 3 with an interval capable of rotating from the lock position to the unlock position.
In this state, the worker pulls out the cover 4 while lifting the fall prevention lid, and removes the cover 4 from the receiving frame 2 as described above.
When the operator releases his / her fingertip from the operation unit 31b, the lock plate 31 returns to the lock position by the spring force of the spring 32.

When the fall prevention lid 4 is mounted on the receiving frame 2, the same operation as in the first embodiment is performed. As shown in FIG. 11, since the lower end surface of the lock portion 31 a is an inclined surface 31 c, the lid 4 is lowered during the fall prevention and the inclined surface 31 c hits the upper edge of the mounting seat 3 of the receiving frame 2. 12 in the direction shown by the arrow in FIG. 12 against the spring force of the spring 32, and the locking portion 31 a is mounted just before the upper plate 7 a of the locking member 7 is placed on the upper surface of the mounting seat 3. 3 and returns to the locked position shown in FIG. 11 by the spring force of the spring 32. As a result, the lock plate 31 engages with the lower surface of the mounting seat 3 of the receiving frame 2 to prevent the falling-off prevention lid 4 from falling off.

(Embodiment 3) FIGS. 13 to 15 show a third embodiment of the present invention. Note that members that are the same as or correspond to those of the first embodiment shown in FIGS. 1 to 9 are given the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 13, one end of each of the left and right side rods 5 of the fall prevention middle lid 4 is provided inside these side rods 5.
A locking mechanism 40 slidable along the side rod 5 is provided, and a locking member 8 and a fixing member 9 are fixed to the other end. As shown in FIGS. 13 and 14, the locking mechanism 40 includes left and right lock plates 41, 41 as locking members (second locking members), and a connecting member 4 for connecting these.
2 and a spring 43 as an elastic member. The lock plate 41 is a rod-shaped body that opens downward and has a substantially U-shape in end view.
There are long holes 41c, 41c along the longitudinal direction near the tip,
Holes 41d, 41d are formed in the rear end. On the other hand, the side rod 5 is provided with a hole 5b at a position corresponding to the long hole 41c of the lock plate 41 and a long hole 5d along the longitudinal direction at a position corresponding to the hole 41d. The long hole 5d has the same length as the long hole 41c of the lock plate 41.

A lateral rod 6 connecting one side of the lateral rod 5 has an end 6
a is inserted through the long holes 41c, 41c of both side plates 41a, 41a of the lock plate 41, and the screw portion 6b is inserted into the hole 5 of the side rod 5.
b and is fixed to the side rod 5 by the nut 44. The connecting member 42 has an end 42 a that is formed in the hole 4 of the lock plate 41.
1d and 41d are fitted and fixed, and are fixed to the side rod 5 by a nut 45 so that the screw portion 42b at the tip can slide in the long hole 5d of the side rod 5. Thus, the lock plate 41 can be slid horizontally in the front-rear direction along the side rod 5 by the length of the long hole 41c as indicated by an arrow.

The spring 43 is housed in the lock plate 41, one end 43a of which is locked by the end 6a of the horizontal rod 6, and the other end 43b of which is locked by the end 42a of the connecting member 42. Is pulled in the protruding direction (the direction of the engagement position). In addition, as shown in FIG. 13, a support plate 46 is provided at the center of the fall prevention middle lid 4 along the longitudinal direction and bridged so as to be fixed to the upper surface of each horizontal rod 6. The support plate 46 has a function of narrowing the partition between the side bars 5 and the reinforcing member when the number of the horizontal bars 6 is reduced.

On the other hand, as shown in FIGS. 13 and 15, the receiving frame 2 is provided with a concave mounting seat 17 which is opened on the inner peripheral surface corresponding to the tip of each lock plate 41. As shown in FIG. 15, in a state where the fall prevention lid 4 is attached to the receiving frame 2, the lock plate 41 is pulled by the spring 43 so that the leading end enters the concave mounting seat 17, and the lower surface of the lock plate 41 has the bottom surface. It is placed on the section 17a.
Further, when the lid 4 is pushed up during the fall prevention, the tip of the upper surface portion 41b of the lock plate 41 is engaged with the upper surface portion 17b of the concave mounting seat 17 to prevent detachment.

When the fall prevention lid 4 is removed from the receiving frame 2, the operator grasps the connecting member 42 and pulls the lock plate 41 against the spring force of the spring 43 as shown by the arrow in FIG. Is disengaged from the upper surface 17b. In this state, the operator pulls out the cover 4 while pulling it out while taking out the fall prevention lid. When the operator releases his / her hand from the connecting member 42, the lock plate 41 returns to the locked position by the spring force of the spring 43.

The structure of the fall prevention inner lid 4 is the third one.
In place of the fixing member 9 in the embodiment, a locking member (for example,
The lock plate 26) described in the first embodiment may be employed as the first engagement member, and the lock plate 41 may be employed as the second engagement member. Further, when the first locking member is employed in the above configuration, the end of the side rod 5 is simply extended without using the second locking member (lock plate 41) as an engagement member. Is also good.

(Embodiment 4) FIGS. 16 to 18 show a fourth embodiment of the present invention. Note that members that are the same as or correspond to those of the first embodiment shown in FIGS. 1 to 9 are given the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 16, a lock 7 is fixed to one end of the side rod 5 of the fall prevention lid 4, and a lock mechanism 50 is provided below the lock 7. The locking mechanism 50 includes a lock plate 51 as a locking member,
The lock includes a lock, for example, a padlock 52, as a fastening member for fastening the locking member 7 and the lock plate 51.

The tip of the lock plate 51 is the lock portion 5.
1a, the base end 51b is fixed to the locking member 7 by the bolt 53.
Is rotatably supported by the side plate 7c and is fixed by a nut 54. When the lock plate 51 is horizontally supported, the lock portion 51 a is attached to the mounting seat 3 of the receiving frame 2.
It is located below. Lock plate 5
An operation unit 51c for putting a finger on the first lock unit 51a
Are provided so as to protrude substantially horizontally outward, and a hole 51d is formed in a lower portion of the lock portion 51a. On the other hand, the lock plate 51 is attached to the side
A hole 7i is formed at a position corresponding to the hole 51d in a state where the hole 7i is kept parallel to the upper plate 7a. And these holes 5
The hooks 52a of the padlock 52 can be inserted into 1d and 7i.

As shown in FIG. 17, in a state in which the lid 4 is mounted and the stopper 7 is placed on the mounting seat 3 of the receiving frame 2 as shown in FIG. 17, the lock plate 51 is rotated to the horizontal position.
The hook 52a of the padlock 52 is inserted and locked in the hole 51d and the hole 7i of the locking member 7. When the lock plate 51 is held horizontally, the lock portion 51a
Penetrates below the mounting seat 3 and can be engaged with the mounting seat 3. When the lid 4 is pushed up during the fall prevention, the lock portion 51a of the lock plate 51 is engaged with the lower surface of the mounting seat 3 of the receiving frame 2 to prevent the lock plate 51 from being detached. Further, since the lock plate 51 and the locking member 7 are fastened by the padlock 52, it is possible to reliably prevent a person other than the worker from removing the fall prevention inner cover 4.

To remove the fall prevention lid 4 from the receiving frame 2, an operator unlocks the padlock 52 with a key (not shown) and pulls out the hook 52a from the lock 7 and the holes 7i and 51d of the lock plate 51. 18, the lock portion 51a of the lock plate 51 is rotated downward by its own weight, and the engagement with the mounting seat 3 is released. As a result, the fall prevention lid 4 can be removed.

When the fall prevention lid 4 is mounted on the receiving frame 2, the operator lifts the operation portion 51c of the lock plate 51 with a fingertip and rotates upward to a substantially horizontal position as shown by the arrow in FIG. Next, the hook 52 of the padlock 52
a is the hole 51d of the lock plate 51 and the hole 7i of the locking member 7.
And lock it. As a result, the lock plate 51 is engaged with the mounting seat 3 of the receiving frame 2 to prevent the falling-off prevention lid 4 from being detached.

(Embodiment 5) In the fifth embodiment of the present invention, the drawings will be omitted, and description will be made with reference to the configurations described in the above embodiments. In this embodiment, the fall-preventing inner lid 4 in which all the mounting seats 3 protruding in an arc shape of the receiving frame 2 are removed, and the concave mounting seats 17 described in the third embodiment are mounted on the receiving frames formed at four locations will be described. . The fall prevention middle lid 4 is an engaging member that extends the locking tool 8 formed at one end of the left and right side rods 5 and is inserted into the concave mounting seat 17. A slidable lock pre and 41 to be inserted are formed as locking members. In this case, as the engagement member, the end of the side rod 5 is extended so that the bottom 1
7a and may be engaged with the upper surface 17b.

Also, the bottom portion 17 of all the concave mounting seats 17
A slidable locking member (lock plate 41) may be placed on a and may be engaged with the upper surface 17b. In this case, since all are the lock plates 41, the operator can remove the lock plate 41 at a position where the cover 4 that is easy to remove the fall prevention lid 4 is located at the lock release position.

Although the present invention has been described based on the five embodiments, the present invention is not limited to the embodiments.
For example, in the first embodiment, the lock 7 is attached to the mounting seat 3.
In addition, the locking device 8 was placed on the handgrip 16 in a total of four places,
The number is not limited. Further, the lock plate 26 is formed below the upper plate 7a of the locking member 7 so as to be engaged with the lower surface of one mounting seat 3, and the fixing member 9 is formed below the locking member 8 and Are engaged with the lower surfaces of the handgrips 16, 16, but the number and locations to be formed are not limited. In addition, the entire shape of the fall prevention inner lid is formed in a circular shape by providing a net such as an expander on a circular main frame having a smaller diameter than the opening of the receiving frame 2 and forming a plurality of main frames at equal intervals in the circumferential direction. For example, it may be placed on the mounting seat 3 or the concave mounting seat 17 at three places and engaged therewith. Further, the concave mounting seat 17 may also be used as a lock engaging portion 18 (FIG. 2) that engages with a lock (not shown) provided on the peripheral edge of the back surface of the lid body.

Further, the lock plate 31 of the locking mechanism 30 shown in FIG. 11 is used as a locking member that can be displaced between a position where it is engaged with the upper surface portion 17b of the concave mounting seat 17 and a position where the engagement is released. May be. However, in this case, in a state where the lock plate 31 is placed on the bottom surface portion 17a of the concave mounting seat 17, if a load is applied to the lid 4 during the fall prevention from above, the lock plate 31 will rotate to the unlock position. Therefore, holes are formed in the lock plate 31 and the side rod 5, and the hook of the padlock 52 is inserted through these holes so that the lock can be securely mounted on the bottom surface 17 a of the concave mounting seat 17.

In the first and second embodiments, the locking member is provided below one of the locking members 7, 7. 7, a fastening member such as a padlock may be added to the first and third embodiments to prevent a person other than an operator from entering the inside of the underground structure. Is also good. Specifically, in the first embodiment, the lock plate 26 and the upper plate 7
A hole is formed in the hole a, and a hook of a padlock is inserted through the hole so that the lock plate 31 cannot be operated. In the third embodiment, a padlock hook is inserted into the long hole 41c of the lock plate 41 held at the lock position so that the lock plate 41 cannot be operated.

[0051]

According to the fall prevention middle cover of the underground structure cover of the present invention, the locking member is placed on the overhang when the fall prevention middle cover is mounted on the receiving frame, and the fixing member or the fastening member is engaged. The stop member is engaged with the lower surface of the overhanging portion, or the engaging member or the locking member is placed on the bottom surface of the concave mounting seat, and the engaging member or the locking member is mounted on the upper surface of the concave mounting seat. It is possible to engage. As a result, the fall prevention middle lid can be placed on the receiving frame and does not separate from the receiving frame, so a temporary increase in rainfall causes a rise in pressure in the underground structure, and if the lid body is opened by any chance However, it is possible to maintain a state in which the fall prevention lid is attached to the receiving frame, and it is possible to prevent a pedestrian or the like from falling into the underground structure. Also, when removing the fall prevention inner lid from the receiving frame when inspecting the underground structure, etc., it is possible to remove it by releasing the engagement between the locking member and the overhanging portion or the locking member and the concave mounting seat. it can.

Further, the holding member is formed of an elastic member, and the locking member is urged to the engagement position by the elastic member, so that the locking member is forgotten to be hooked when the fall prevention middle cover is mounted on the receiving frame. Can be prevented. Furthermore, the holding member is constituted by a fastening member, and the locking member is held at the engagement position by the fastening member, whereby the fall prevention lid can be reliably held in a state of being attached to the receiving frame, and other than the worker Can be prevented from being opened.

The same effect as described above can also be obtained in a receiving frame provided with the above-mentioned fall prevention inner lid.

[Brief description of the drawings]

FIG. 1 is a plan view of a receiving frame provided with a fall prevention inner lid of an underground structure lid according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a plan view of the fall prevention inner cover of FIG. 1;

FIG. 4 is a cross-sectional view of the fall prevention inner lid of FIG. 3 taken along the line IV-IV.

FIG. 5 is an enlarged view of a stopper at a distal end of the fall prevention inner cover of FIG. 1;

FIG. 6 is an exploded perspective view of the locking tool and the locking mechanism of FIG. 5;

FIG. 7 is a plan view of the locking mechanism in a state where an upper plate of the locking tool of FIG. 5 is removed.

FIG. 8 is a side view of a state where the locking mechanism of FIG. 6 is assembled.

9 is a sectional view taken along the line IX-IX in FIG.

FIG. 10 is a partially cutaway plan view showing a second embodiment of the present invention.

FIG. 11 is a side view of the locking member of FIG. 10;

FIG. 12 is an explanatory diagram showing a release operation of the locking mechanism of FIG. 11;

FIG. 13 is a plan view showing a third embodiment of the present invention.

FIG. 14 is an exploded perspective view of the locking mechanism of FIG.

FIG. 15 is a sectional view taken along the arrow line XV-XV in FIG. 13;

FIG. 16 is an exploded perspective view showing a fourth embodiment of the present invention.

17 is an engagement state (locked state) of the locking mechanism of FIG. 16;
FIG.

18 is a view showing an unlocking bear of the locking mechanism of FIG. 17;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover for underground structures 2 Receiving frame 3 Mounting seat (projection part) 4 Fall prevention middle lid 5 Side rod 6 Horizontal rod 7, 8 Locking tool 9 Fixing member 16 Handhold (extension part) 17 Recessed mounting seat 17a Bottom surface Part 17b Upper surface part 25, 30, 40, 50 Locking mechanism 26, 31, 41, 51 Lock plate (locking member) 27 Torsion coil spring (elastic member as holding member) 28, 33, 53 Bolt 43 Spring (holding member) 52 padlock (fastening member as holding member)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiji Yoshimura 5-18-18 Kakekasu, Hakata-ku, Fukuoka, Fukuoka Prefecture Inside Hino Waterworks Equipment Co., Ltd. (72) Makoto Oyama 5-chome Kakekazu, Hakata-ku, Fukuoka Prefecture No. 18 Hinode Water Supply Equipment Co., Ltd. (72) Inventor Tomokazu Hasegawa 5-18-18 Hikazu-ku, Fukuoka City Fukuoka Prefecture Inside (72) Inventor Takayuki Hirotaki 5 Kakekasu Hakata-ku, Fukuoka City, Fukuoka Prefecture No.8-18 Hinode Water Supply Equipment Co., Ltd. F-term (reference) 2D047 BA09 BB26

Claims (8)

[Claims] 1. A fall prevention middle lid of an underground structure cover detachable from a receiving frame having an overhanging inner surface, wherein the fall prevention middle lid is placed on the overhang portion. A plurality of locking tools, a fixing member provided to be engaged with the lower surface of the overhang portion, an engagement position for engaging the lower surface of the overhang portion, and a release position for releasing the engagement. And a holding member for positioning the locking member at an engagement position, wherein the fixing member and the locking member are configured such that, in a state where the fall prevention inner lid is attached to a receiving frame, The fall prevention middle cover of an underground structure cover, wherein the fall prevention middle cover is arranged so as not to be detached from the receiving frame when the locking member is located at the engagement position. 2. A fall-preventing lid for an underground structure lid that is detachable from a receiving frame formed with an overhanging portion projecting from the inner peripheral surface and a concave mounting seat opened to the inner peripheral surface. The fall prevention middle lid is engaged with a locking member placed on the overhang portion, and with a fixing member engaging with the lower surface of the overhang portion or with an engagement position engaging with the lower surface of the overhang portion. A first locking member that can be displaced to a release position where the first mounting member is released, and an engagement position that can be placed on the bottom surface portion of the concave mounting seat and engages with the upper surface portion of the concave mounting seat. A second locking member that can be displaced to a release position where the first member and the second member are displaced, and a holding member that positions the first and second locking members at respective engagement positions. The locking member and the second locking member are configured such that, in a state where the fall prevention inner lid is mounted on a receiving frame, the respective locking members are in an engagement position. The fall prevention middle cover of the underground structure cover, wherein the fall prevention middle cover is arranged so as not to be detached from the receiving frame when the cover is located at the position. 3. A fall prevention inner lid for an underground structure lid which is detachable from a receiving frame formed with an overhanging portion projecting from the inner peripheral surface and a concave mounting seat opened to the inner peripheral surface. The fall prevention middle lid, a locking tool to be placed on the overhang, a first position displaceable between an engagement position for engaging the lower surface of the overhang and a release position for releasing the engagement. And an engaging member that can be mounted on the bottom surface of the concave mounting seat and that can be mounted on the bottom surface of the concave mounting seat. A second locking member displaceable between an engagement position for engaging the upper surface of the mounting seat and a release position for releasing the engagement, and the first and second locking members are respectively set to the engagement positions. A holding member to be positioned, wherein the first locking member and the engaging member or the second locking member receive the fall-preventing inner cover in a frame. In a state in which the locking member is located at the engagement position in a state where the locking member is located at the engagement position, the fall prevention inner lid is arranged so as not to be detached from the receiving frame. Fall prevention inner lid. 4. A fall prevention middle lid of an underground structure cover detachable from a receiving frame having a recessed mounting seat formed on an inner peripheral surface thereof, wherein the fall prevention middle lid is a bottom surface of the concave mounting seat. A plurality of locking members that can be placed on the portion and can be displaced between an engagement position where the upper surface portion of the concave mounting seat is engaged and a release position where the engagement is released, or a bottom surface portion of the concave mounting seat A locking member displaceable between an engagement position for engaging with the upper surface of the concave mounting seat and a release position for releasing the engagement, and a mounting member which can be mounted on the bottom surface of the concave mounting seat. And an engaging member engageable with the upper surface of the concave mounting seat; and a holding member for positioning the engaging member at the engaging position. The engaging member, or the engaging member and the engaging member, In a state where the fall prevention middle lid is mounted on the receiving frame, the locking member is engaged. The fall prevention in fall prevention in the lid of the underground construction for the lid, wherein the lid is arranged so as not detached from the receiving frame when positioned in location. 5. The holding member is formed of an elastic member, and the locking member is rotatably supported by a shaft and urged to an engagement position by the elastic member.
The fall prevention middle lid of the lid for underground structures according to any one of the above. 6. The holding member is formed of an elastic member, and the locking member is horizontally slidable with respect to the fall prevention lid in the mounted state, and is urged to an engagement position by the elastic member. A fall prevention inner lid of the lid for an underground structure according to any one of claims 1 to 4. 7. The underground structure according to claim 1, wherein the holding member is constituted by a fastening member, and the locking member is held at an engagement position by the fastening member. Lid to prevent the lid from falling. 8. A receiving frame formed with a projecting portion projecting on the inner peripheral surface and / or a concave mounting seat opened on the inner peripheral surface.
A receiving frame provided with the fall prevention inner lid, wherein the fall prevention inner lid of the underground structure lid according to any one of claims 1 to 7 is mounted.