JPH09105133A - Square cover for underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly carry out the opening or closing work of a cover body even if it is large, by providing auxiliary wheels at the underface of the cover body positioned between rails formed in the transfer direction of the cover body along the inside of two parallel sides of a receive frame. SOLUTION: Rotating rolls 6a, 6b traveling on a rail 4 and rotating rolls 6c, 6d traveling on a rail 5 are provided at the underface of a cover body 2. And guide rolls 6e, 6f are equipped as auxiliary wheels in the same direction with these rotating rolls 6a-6d, at the middle thereof. When opening the cover body so as to pull a receive frame 1 outwards, the guide rolls 6e, 6f rapidly get over the receive frame 1 while rolling from the inner periphery of the receive frame to the upper end. After the guide rolls 6e, 6f have over the upper end of the receive frame 1, they rotate on the passage face in cooperation with the rotating rolls 6a-6d to rapidly move the cover body 2 on the passage face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a square lid for an underground structure in which a lid main body can be easily pulled out from a receiving frame to the ground side to open the lid.

The term "square lid for underground structure" as used in the specification of the present application means a large iron lid for closing an opening through an underground buried object in a sewer, an underground structure facility or the like and the ground, Manhole cover, iron gutter cover that can be opened and closed to protect underground facility equipment and underground cables in power and communication, iron cover for power transmission, iron cover for power distribution, buried conduit under the road surface in water supply and gas pipes and its accessories Square shape of underground structure lids such as fire hydrant lid, water control valve lid, sluice valve lid, air valve lid, gas pipe lid, water meter lid, etc. The rectangular shapes are collectively referred to.

[0003]

2. Description of the Related Art A lid for an underground structure provided in a manhole, a pit accommodating facility equipment for electric power / communication, a common ditch for installing an underground cable, etc. is covered with a receiving frame buried on the ground surface and the receiving frame. It has a structure combined with a lid body that can be opened and closed.

[0004] In such a lid for an underground structure, there are a lid body which is connected to a receiving frame by a hinge and is opened and closed by reversing or turning, and a lid body which is opened while pulling the lid body toward the road surface. For example, 5-27
As described in Japanese Patent Publication No. 549, in which the lid can be opened by using the inclined guide provided in the receiving frame, the sliding protrusion provided on the lower surface of the lid main body is moved while abutting against the guide. , It is possible to open the lid while raising the level of the lid main body by the inclination of this guide. A joint protection roller and a slide plate are provided on the lower surface of the lid main body so that the joint around the receiving frame is not damaged when the lid main body is pulled out to the road surface side.

In order to improve the workability when the lid body is pulled out from the receiving frame, as described in Japanese Utility Model Publication No. 2-40102, a jig is placed from the center of the lid body on the lower surface of the circular lid body. There is also one in which a rolling roller is provided at a position deviated to the side of the insertion engaging portion and the rolling roller is caused to travel on the road surface.

As described above, in the structure in which the lid main body is pulled out to the road surface side to open the lid, it is generally used in the field of square lids for underground structures to utilize the rollers for preventing damage to the joints of the road surface. Has been done.

[0007]

However, in those disclosed in these publications, both the joint protection roller and the rolling roller act when the lid body moves on the road surface. In the former publication, the lower surface of the lid body on the side where the roller is not provided is in contact with the upper surface of the guide, and in the latter publication, the outer circumference of the lid body is The surface comes into contact with the inner peripheral surface of the receiving frame. Also, when pulled out to the road surface side, the lower surface of the lid main body on the side where the roller is not provided comes into contact with the upper end of the receiving frame and the road surface and moves, and in order to prevent these, move the lid main body up Is necessary,
The work load increases.

As described above, it is difficult to say that the conventional structure is optimized in terms of safety and workability of the lid opening work, and even a large lid body can be opened and closed quickly. Doing so remains an issue.

An object to be solved in the present invention is to provide a square lid for an underground structure which can perform the lid opening and closing operations of the lid main body more safely and quickly.

[0010]

According to the present invention, there is provided a receiving frame which is buried in the ground surface and which has an opening communicating with an underground structure, and has at least two opposing sides parallel to each other. A lid body that is capable of being incorporated as a single or a plurality of arrangements; a rail that forms a rolling surface in the moving direction of the lid body along the inside of two parallel sides of the receiving frame; and a bottom surface of the lid body. Is characterized in that it comprises at least two consecutive wheels arranged at intervals in the moving direction of the lid body and capable of rolling on the rails, respectively, and auxiliary wheels arranged between the rails.

The lid body may be provided with a stopper capable of restricting the movement after the lid is opened. In this case, the stopper is provided at the lower portion of the lid body so as to be able to be extended to the same level as or lower than the lower end level of the wheel. Therefore, the stopper can be set to be seated on the road surface around the receiving frame or to be engaged with the receiving frame.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The receiving frame may be, for example, a rectangular planar shape, and if rails are formed along the peripheral walls forming the two sides in the longitudinal direction, a plurality of lid main bodies can be formed. The wheels can be placed on the rails and can be installed so as to be movable in the longitudinal direction of the receiving frame. By arranging auxiliary wheels on the lower surface of the lid body located between the rails, when the lid body is pulled out from the receiving frame to open the lid, the auxiliary wheels roll from the inner circumference to the upper end of the receiving frame. Quickly get over the quota while moving. In addition, after the auxiliary wheels have passed over the upper end of the receiving frame, the auxiliary wheels use the road surface as a rolling surface to roll in cooperation with other wheels, and promptly move the lid body on the road surface.

When the lid body is provided with a stopper, the lid body is seated on the road surface when the lid body is pulled out to the road surface side, whereby movement of the lid body can be restricted. Also, by setting the posture to engage with the receiving frame,
The lid main body can be restrained and kept so as not to separate from the receiving frame.

The stopper for retaining the lid body is included in, for example, the peripheral wall of the lid body so as not to interfere with the upper edge of the receiving frame when the lid body is moved between the receiving frame and the road surface side. Can be incorporated.
That is, the stopper is rotatable and its center of rotation is eccentric, so that a part of the stopper can be set to a posture protruding below the lower end surface of the lid body, or can be detached from the lid body. The upper and lower positions may be changed so that they can be seated on the road surface or hooked on the inner peripheral wall of the receiving frame.

[0015]

1 is a perspective view showing an embodiment of a square lid for an underground structure according to the present invention, and FIG. 2 is a plan view showing a state in which an interlock is not embedded. It is an example that can be applied as.

In the drawing, two lid bodies 2 and 3 are provided for a rectangular receiving frame 1 which is embedded in the ground and whose upper end is at the level of the ground surface. The surfaces of these lid bodies 2 and 3 are provided. For example, an interlock is embedded in each of them as shown in FIG.

FIG. 3 is a vertical cross-sectional view taken along the line AA of FIG. 2, and FIG. 4 is a vertical cross-sectional view taken along the line BB of FIG. [Fig. 6] is a vertical cross-sectional view of a main part when the other lid body 3 is pulled up to the road surface side.

The receiving frame 1 is assembled by four frame plates 1a to 1d into a rectangular shape, and rails 4 and 5 are integrated along the inner walls of the frame plates 1a and 1b forming the long sides. It is provided in. Then, as shown in FIG. 4, the frame plate 1
The seats 1g and 1h supporting the lid bodies 2 and 3 are formed in the upper middle portions of the rails 4 and 5 of a and 1b, and the seats 1g and 1h are slightly inclined from the seats 1g and 1h toward the outside of the receiving frame 1. The taper fitting surfaces 1e and 1f thus made stand up. Also,
The frame plates 1a and 1b are provided with lock seats 1i for locking the lid bodies 2 and 3 at two opposing positions. As shown in FIG. 1, these lock seats 1i are formed in a concave shape on the inner wall of the frame plate 1a.

The rail 4 along the inner wall of one frame plate 1a is
As shown in FIG. 5, the lid bodies 2 and 3 are arranged in the longitudinal direction of the frame plate 1a.
For this purpose, the guide portions 4a and 4b as rolling surfaces are respectively raised from the bottom surface portion so that the lid main bodies 2 and 3 can be easily pulled out onto the road surface when the lid is opened. These guide parts 4
a and 4b are shorter than the length of the peripheral wall of the lid main bodies 2 and 3 in the moving direction, and the inclined surfaces 4 that fall downward at both ends in the longitudinal direction.
c and 4d are formed and the lock seat 1i is formed in the substantially central portion.
The concave portion 4 as a rolling surface is slightly depressed in the portion corresponding to
e is provided.

The rail 5 provided on the other frame plate 1b also has the same shape, and like the rail 4 shown in FIG. 5, the guide portions 5a and 5b and the inclined surfaces 5c and 5d are formed.
And a concave portion 5e are formed respectively. In FIG. 5, rails 5 are indicated by parenthesized reference numerals.

As shown in FIG. 4, the lid main body 2 has fitting surfaces 2a and 2b which are shaped so as to face the tapered fitting surfaces 1e and 1f of the frame plates 1a and 1b in the longitudinal direction of the receiving frame 1 in the longitudinal direction. Formed in full length. Further, the lower portions of the peripheral walls located at both ends of the lid main bodies 2 and 3 in the moving direction are provided with appropriate clearances with the frame plates 1c and 1d so that the frame plates 1c and 1d can be opened.
It is configured so as not to interfere with d.

On the lower surface of the lid body 2, rolling rolls 6a and 6b as two wheels traveling on the rail 4 and rolling rolls 6 as two wheels traveling on the other rail 5 are provided.
c and 6d are provided, and two guide rolls 6e and 6f as auxiliary wheels are attached to the central portion in the same direction as these rolling rolls 6a to 6d. The rolling rolls 6a to 6d and the guide rolls 6e and 6f are all set to have the same outer diameter and the same rotation axis. Then, as shown in FIG. 5, when the lid main body 2 is incorporated in the receiving frame 1 and is in the closed state, the rolling rolls 6a to 6d are all guide portions 4a and 5a of the rails 4 and 5, respectively. As shown in FIG. 4, the lower end portions of the fitting surfaces 2a and 2b of the lid main body 2 are placed on the receiving seats 1g and 1h of the receiving frame 1 so as to straddle the bases. That is, when the lid main body 2 is covered with the receiving frame 1 and the lid is closed, there is no load on the rolling rolls 6a to 6d, and the lower ends of the fitting surfaces 2a and 2b are attached to the receiving seats 1g and 1h of the frame plates 1a and 1b. The lid body 2 is mounted and supported.

The lid body 2 is provided with a lock 7 at a portion facing each of the frame plates 1a and 1b of the receiving frame 1. As shown in FIG. 6, the lock 7 has a lock mounting seat 2c formed by being recessed in the lid main body 2 and is rotatably operated through a mounting hole 2d formed in the lock mounting seat 2c. By engaging the lock block 7a with the lock seat 1i.
Is locked to the receiving frame 1 and locked.

Further, the lid main body 2 is provided with two stoppers 8 on each of the two surfaces facing the opening / closing direction for restricting the movement on the road surface when the lid main body 2 is opened.
As shown in FIG. 7, these stoppers 8 are integrated with a support shaft 8a rotatably penetrating a mounting seat 2e formed by denting the peripheral wall of the lid body 2. You can change the posture by rotating. That is, when the lid body 2 is closed, as shown in FIG.
As shown in (a) of FIG. 7, the stopper 8 is placed in the rear surface side of the mounting seat 2e, and after the lid is opened and moved to the road surface, the support shaft 8a is rotated as shown in FIG. The lower end of the is to be extended downward so that it can be seated on the road surface. Further, as shown in FIG. 1, if the stopper 8 is rotated by about 90 degrees from its stored state,
After the lid body 2 is pulled out of the receiving frame 1, these stoppers 8 engage with the upper end of the frame plate 1c of the receiving frame 1, whereby the lid body 2 can be retained so as not to separate from the receiving frame 1.

The same applies to the other lid body 3, which is four rolling rolls 3a and two guide rolls 3.
b is provided, and the lock 3c and the stopper 3d are attached at predetermined positions. And, in each of the lid main bodies 2 and 3, there are burl holes 2f and 3 at four corners respectively.
It is possible to insert a tool such as a burl into these burl holes 2f and 3f by opening f.

The opening / closing operation of the lid body 3 with respect to the receiving frame 1 is the same as that of the other lid body 2, and a tool used for this opening / closing operation will be described with reference to FIG.

FIG. 8A shows a burl 9 for unlocking and locking the locks 3c and 7, which can also be used for rotating the support shaft 8a of the stopper 8, one end of which is shown. The protrusions 9b provided on the upper ends and the other ends of the locks 3c and 7 are covered with the plug 9a provided on the support shaft 8a of the stopper 8 by concavo-convex fitting so that these can be rotated. The hook 9c
Is used for closing the lid by hooking on the burl holes 2f, 3f of the lid bodies 2, 3, and can also be used for opening the lid as described later.

FIG. 8B shows an opening tool 10 used when the lid main bodies 2 and 3 are pulled out from the receiving frame 1 to open the lid, which is operated by two people when the lid is opened. Opening tool 1
The two lids 0 and 2 are used simultaneously to operate the lid bodies 2 and 3, respectively. The opening tool 10 connects the operation rod 10b to the frame 10a, and also has a large diameter main wheel 10c and a small diameter auxiliary wheel 10
d with a hook 1 at the end of the frame 10a.
0e is swingably attached.

The operation of opening the lid main body 2 having the above-described structure will be described in order with reference to FIGS. 9 and 10.

First, the plug 9a of the burl 9 is put on the upper end of the lock 7, and the lock block 7a of the lock 7 is rotated in such a direction that the lock block 7a comes out of the lock seat 1i, whereby the lid body 2 is unlocked from the receiving frame 1. To do.

Next, the two opening tools 10 are installed in FIG. 9 (a).
As shown in, the hook 10e is inserted into the burl hole 2f positioned along the frame plate 1c with the auxiliary wheel 10d attached to the road surface, and the hook 10e is hooked in the burl hole 2f. Next, when the operation rod 10b is pushed down as shown in FIG. 9B to bring the main wheel 10c into contact with the road surface, one end side of the lid body 2 is lifted from the receiving frame 1. Then, when the operation rod 10b is further pushed down as shown in FIG. 9C, the frame 10a rotates around the main wheel 10c, so that the hook 10e is rotated.
Moves to the left while rising in the figure. As a result, the lid main body 2 moves while the rolling rolls 6b and 6d roll on the guide portions 4a and 5a from the respective inclined surfaces 4d and 5d of the rails 4 and 5, and the lid main body 2 has two pieces. Only the rolling rolls 6b and 6d roll on the guide portions 4a and 5a.

When the opening tool 10 is further moved in the direction away from the receiving frame 1, the guide rolls 6e and 6f approach the frame plate 1c side of the receiving frame 1 as shown in FIG.
These guide rolls 6e and 6f come into contact with the upper end portion of the frame plate 1c. At this time, since the guide rolls 6e and 6f rotate following the frame plate 1c, the guide rolls 6e and 6f quickly pass over the frame plate 1c from the state shown in (a) of the figure as shown in (b) of the figure. It is possible to move. Therefore, even when the lid body 2 is extended to the road surface side, the lid body 2 can be moved without receiving a large resistance from the receiving frame 1.

When the guide rolls 6e and 6f pass over the frame plate 1c, the operating rod 10b is erected as shown in (c) of FIG.
6c and the guide rolls 6e and 6f are supported at four points, so the lid body 1 can be pulled out to the road surface side by moving the opening tool 10 as it is, and the remaining rolling rolls 6b and 6d also move to the road surface side. The opened lid state is set.

After the lid is opened, as shown in FIG. 1, the two stoppers 8 are rotated by the projections 9b of the burls 9 to engage the lower ends of the stoppers 8 with the frame plate 1c. Further, the stopper 8 pulled out to the road surface side is also rotated as shown in FIG. 3 so that the lower end thereof is set so as to be attached to the road surface. As a result, one end side of the lid main body 2 is restrained by the receiving frame 1 and the other end side of the lid main body 2 is seated on the road surface via the stopper 8. Therefore, the lid main body 2 may move due to the inclination of the road surface after the lid is opened. It is retained without any.

The opening operation of the other lid main body 3 can be performed in the same manner, and after opening the lid, it can be restrained to the receiving frame 1 side by the stopper 8 to eliminate its unnecessary movement.

To close the lid main body 2 that has been opened, after the stopper 8 is housed in the protruding portion 9b of the burl 9 from the state of FIG. 1, the hook portion 9c of the burl 9 is hooked on the burl hole 2f and the lid is closed. The main body 2 is pulled back to the receiving frame 1 side, and the lid main body 2 is dropped into the receiving frame 1. As a result, in the lid body 2, the two rolling rolls 6b and 6d are connected to the guide portions 4a and 5 of the rails 4 and 5.
It rolls a and is finally set to the closed position.

At this closed position, as shown in FIG.
The lower ends of the fitting surfaces 2a and 2b of the lid body 2 are the seats 1 of the receiving frame 1.
The rolling rolls 6a to 6d and the guide rolls 6e and 6f are placed on and supported by g and 1h, and are not in contact with the receiving frame 1. Then, the rolling rolls 6a to 6d have inclined surfaces 4c and 4d.
Since it is located so as to cover d, 5c, 5d, the lid main body 2
Try to move in that direction, the inclined surfaces 4c, 4d,
Unless sufficient force acts to overcome 5c and 5d,
The lid body 2 is held in the receiving frame 1.

After the lid body 2 is closed, the burl 9
The lock block 7a is caused by the turning motion of the lock 7 by the
By engaging with the lock seat 1i of the receiving frame 1, the lid main body 2 can be locked to the receiving frame 1.

In the illustrated example, the opening and closing of the two lid main bodies 2 and 3 has been described. However, in the case of a receiving frame in which three lid main bodies are arranged, for example, the movement direction of the lid main body is the first. One lid main body located on one side of the receiving frame is opened in the same manner as in the above example. Then, open the central lid body by setting an opening tool from the lid body side located on the other side of the receiving frame with respect to the burr hole of the central lid body.
After that, the remaining lid body may be opened in the same manner as in the previous example. In short, even in the case where three or more lid bodies are provided, the lid body located next to the lid body may be opened and closed in order to get over the lid body in the closed state.

Even in the case of a two-piece lid, the burl holes 2f and 3f are provided at four positions on the lid bodies 2 and 3, and the rails 4 and 5 are symmetrical with respect to the lock seat 1i. Therefore, when there is an obstacle in one direction, both of them can be opened in the other direction.

Further, in the above-described embodiment, the stopper 8 is partly engaged with the frame plates 1c and 1d of the receiving frame 1 when the lid is opened, but the lid bodies 2 and 3 are placed at positions away from the receiving frame 1. When the lid is open, all the stoppers 8 can be set to sit on the road surface. The stopper 8 is designed to be seated on the road surface to restrict the movement of the lid bodies 2 and 3. However, a part of the stopper 8 is used for rolling rollers 3a and 6
a to 6d are directly brought into contact with the rolling rolls 3a, 6a to 6d
It is also possible to restrict the rotation of the.

As the wheels, the rolling rolls 3a, 6 are used.
Although a to 6d and the guide rolls 3b, 6e and 6f are adopted, if the wheels (casters) are capable of directing, the movement of the lid main body after opening the lid is not only linear, but also avoiding obstacles. You can

Further, the guide rolls 3b, 6e, 6
A plurality of f and rolling rolls 3a, 6a to 6d may be provided in the moving direction of the lid bodies 2 and 3. With such a configuration, if one end of the lid bodies 2 and 3 is pulled up onto the road surface, the wheels will always come into contact with the road surface. Therefore, the hook portion 9c of the burl 9 in FIG. It is possible to easily open the lid by hooking the holes 2f and 3f.

FIG. 11 is a perspective view of the essential portion showing another embodiment.

In this embodiment, a stopper is provided on the lid body indicated by reference numeral 11 as an alternative to the lid body 2 described in FIG.
The position and the mounting position of the stopper are the same as those of the lid main body 2 in FIG.

In the figure, the rolling roll 12 (corresponding to the rolling roll 6d in FIG. 1) is located at a position along the fitting surface 11a where the lid body 11 is taper fitted to the frame plate 1b of the receiving frame 1 shown in FIG. The stopper 13 is provided on the peripheral surface that is orthogonal to the fitting surface 11a and faces the insertion / removal direction of the lid body 11.
Is provided with a mounting seat 11b.

As shown in the exploded perspective view of FIG. 12, the mounting seat 11b is provided with a pair of holding ribs 11c at the lower end portion of the outer peripheral surface of the lid body 11 which is recessed.
A through hole 11d is opened in the vertical direction in c, and a hanger block 11e is formed in the central portion on the upper end side. The hanger block 11e is attached to the mounting seat 11b.
It is positioned with a space between the upper end side of the recessed part and the left and right inner peripheral surfaces, and as shown in FIG.
This stopper 13 can be incorporated by moving the stopper 13 in the direction indicated by the alternate long and short dash line in the figure.

That is, as shown in FIG. 11, the stopper 13 is assembled in a state in which a pair of leg portions 13a whose upper end side straddles the hanger block 11e and projects downward are inserted into the through holes 11d of the holding ribs 11c, respectively. . At this time, it is needless to say that the entire volume of the stopper 13 is included in the recess of the mounting seat 11b. For example, when the lid body 11 is pulled out to the road surface and moved by the rolling roll 12, It is assumed that the lower end of the portion 13a does not interfere with the road surface.

FIG. 13 is a perspective view of an essential part showing a state in which the lid main body 11 is pulled out to the road surface side and is then restrained to the receiving frame 1 side by the stopper 13 so as not to move in a direction away from the receiving frame 1. It should be noted that both the opening and closing operations of the lid body 11 are performed in the same manner as described above.

As shown in FIG. 11, the stopper 13 has a lid body 11
When the lower end of the leg portion 13a is lifted from the state where it is incorporated in the mounting seat 11b to the height at which it comes out of the through hole 11d, the stopper 13 is taken out from the mounting seat 11b as shown in FIG. Then, while inserting the leg portion 13a into the through hole 11d, if the upper end side is dropped down so as not to be caught by the hanger block 11e, the leg portion 13a may be projected downward from the through hole 11d as shown in FIG. It is held by the holding rib 11c.

If the leg portions 13a of the stopper 13 are projected below the lower end of the peripheral surface of the lid body 11 as described above, these leg portions 13a are formed on the inner wall on the upper end side of the frame plate 1c as shown in FIG. Get caught. Therefore, as in the case shown in FIG. 1, when the lid body 11 is pulled out to the road surface side, the leg portions 13a of the stopper 13 engage with the frame plate 11c.
The lid body 11 is prevented from separating from the receiving frame 1, and the lid body 11 does not move during the work after the lid is opened.

Further, even when the whole lid body 11 is pulled out to the road surface side and moved to a place away from the receiving frame 1, the stoppers 13 arranged at four places around the lid body 11 are respectively shown in FIG. , The lid body 13 can be kept in place. In this case, for example, when there is a protrusion on the road surface, the lid main body 11 can be restrained by hooking the stopper 13 using the protrusion, and the frame plate 1c of the receiving frame 1 as shown in FIG. The same operation as in the case of engaging with is possible.

On the other hand, even on a road surface having no protrusions or the like, it is possible to hold it in place by seating the lower end surfaces of the legs 13a of the stoppers 13 on the road surface. That is, since the lower end surface of the leg portion 13a of the stopper 13 generates frictional resistance with the road surface, the movement of the lid body 11 can be restricted. In this case, for example, when the legs 13a are inserted into the through holes 11d as shown in FIG. 13, the leg portions 13a are firmly fitted into the through holes 11d. Thirteen
Since the lower end surface of a can be reliably seated on the road surface, it can be held more effectively.

Further, by removing the stopper 13 from the mounting seat 11b and setting it as a car stop for the rolling roll 12, the lid body 11 pulled up to the road surface side can be held in a fixed position. That is, since the stopper 13 is U-shaped, as shown in FIG. 14, the stopper 13 has a size such that the peripheral surface of the rolling roll 12 can be held, and the stopper 13 is inserted in the direction of the arrow in the drawing and placed on the road surface. Then, the stopper 13 comes to have a step in the moving direction of the rolling roll 12 and interferes with it, whereby the lid main body 11 is retained at its fixed position.

[0055]

According to the present invention, since auxiliary wheels are provided in addition to wheels, when the lid main body is pulled out from the receiving frame to open the lid, the auxiliary wheels move quickly without receiving resistance due to interference with the receiving frame. Further, by cooperating this auxiliary wheel with other wheels, light movement on the road surface is also possible, and opening and closing work of the lid main body can be performed easily and workability is improved.

Further, by providing the stopper, the lid main body can be kept at a predetermined position even while the lid main body is being moved to the road surface side, and is safe for passing vehicles, pedestrians and workers during road work. Sex is also secured.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an embodiment of a lid for an underground structure of the present invention.

FIG. 2 is a plan view in the open / closed state of FIG.

FIG. 3 is a view taken along the line AA of FIG. 3 and showing a state where the lid main body is pulled out to the road surface.

FIG. 4 is a vertical cross-sectional view showing a state in which the lid main body is closed by a receiving frame as viewed from the direction of arrows BB in FIG.

FIG. 5 is a vertical cross-sectional view showing a rail provided on the receiving frame and a positional relationship between the rail main body and the rail.

FIG. 6 is a longitudinal cross-sectional view of a main part showing a lock of a lid main body on a receiving frame by a lock together with a burl.

FIG. 7 is a detailed view of a stopper portion provided on the lid main body, in which (a) of the figure shows a state in which the stopper is housed on the back side of the mounting seat, and (b) of the figure shows that the stopper is extended and its lower end portion is shown. The state where it is made to sit on the road surface is shown.

8A and 8B are tools used for opening and closing the lid body, wherein FIG. 8A is a perspective view of a bar for operating a lock and a stopper, and FIG. 8B is a side view of an opening / closing tool for the lid body. It is a figure.

FIG. 9 is a diagram sequentially showing a procedure of an operation for opening the lid body.

FIG. 10 is a diagram sequentially showing a work procedure up to opening of the lid main body, which continues from FIG. 9C.

FIG. 11 is a perspective view of a main part showing another example in which a U-shaped stopper is provided on a mounting seat on the peripheral surface of the lid body.

12 is an exploded perspective view of a stopper and a mounting seat in FIG.

FIG. 13 is a perspective view of an essential part showing a state in which the legs of the stopper are engaged with the receiving frame and the lid main body is retained.

FIG. 14 is a perspective view of a main part showing an example in which a U-shaped stopper is used as a vehicle stopper for a rolling roll.

[Explanation of symbols]

 1: Receiving frame 2: Lid main body 3: Lid main body 3a: Rolling roll (wheel) 3b: Guide roll (auxiliary wheel) 3c: Lock 3d: Stopper 4: Rail 4a: Guide part (rolling surface) 4b: Guide part ( Rolling surface 4e: Recessed portion (rolling surface) 5: Rail 5a: Guide portion (rolling surface) 5b: Guide portion (rolling surface) 5e: Recessed portion (rolling surface) 6a: Rolling roll (wheel) 6b : Rolling roll (wheel) 6c: rolling roll (wheel) 6d: rolling roll (wheel) 6e: guide roll (auxiliary wheel) 6f: guide roll (auxiliary wheel) 7: lock 8: stopper 9: bar 10: Opening tool 11: Lid body 11a: Fitting surface 11b: Mounting seat 11c: Holding rib 11d: Through hole 11e: Hanger block 12: Rolling roll (wheel) 13: Stopper 13a: Leg

Claims (3)

[Claims] 1. A receiving frame which is buried in the ground surface and forms an opening communicating with an underground structure and has a planar shape in which at least two opposite sides are parallel to each other; A lid body incorporated as an array, a rail having a rolling surface formed in the moving direction of the lid body along the inside of two parallel sides of the receiving frame, and a lower surface of the lid body in the moving direction of the lid body. A square lid for an underground structure, comprising at least two wheels arranged at intervals with each other capable of rolling on the rails, and auxiliary wheels arranged between the rails. 2. The square lid for an underground structure according to claim 1, wherein the lid body is provided with a stopper capable of restricting movement after the lid is opened. 3. The stopper is provided at a lower portion of the lid main body so as to be capable of being extended to a level equal to or lower than a lower end level of the wheel, and the stopper is seated on a road surface around the receiving frame or engaged with the receiving frame. The square lid for an underground structure according to claim 2, which can be set to.