JP2977363B2 - Manhole cover height adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground structure such as a manhole laid under a road, the height of a cover installed at a work opening serving as an entrance to the ground of the manhole, and the height and inclination of a road surface. TECHNICAL FIELD The present invention relates to a manhole cover height adjusting device that facilitates an adjusting operation for adjusting to a height.

[0002]

2. Description of the Related Art Generally, underground roads are provided with underground conduits such as communication cable conduits, power cable conduits, gas pipes, and water pipes. There is a manhole with a working port that serves as an entrance to the building. Further, an iron or concrete lid adapted to the road surface height is fitted into the work hole of the manhole.

When an underground structure such as a manhole is provided under an existing road, or when a road is paved after the manhole is provided, the height of the manhole cover is not necessarily the height or inclination of the road surface. Therefore, the height and inclination of the lid are adjusted again by raising the lid.

As an example of such a method of raising the lid,
Japanese Patent Application Laid-Open No. 2-282524 discloses a manhole cover height adjusting device as shown in FIGS. As shown in these figures, at the upper end of a concrete manhole 1 provided below a road 12 or the like, a working port 2 serving as an entrance to the ground is provided. The working port 2 is provided with an inner frame 9 and an outer frame 10 so as to surround the upper end surface 2a. The void formed by the inner frame 9 and the outer frame 10 is filled with the concrete mortar 6.

[0005] At least four studs 7 are buried in the upper end surface 2a of the working port 2. The conical coil spring 5 is inserted into the stud 7. Here, as shown in FIG. 5, for example, the conical coil spring 5 is formed in a conical shape in which the coil diameter gradually decreases toward the top. In addition, since the coil is configured to be flat when the coil is bent to the maximum, a sufficient amount of bending of the conical coil spring 5 can be obtained.

As another example of the conical coil spring 5,
For example, as shown in FIG. 6, there is a type in which a contact portion 5a having a diameter larger than the minimum diameter portion is provided at an upper portion thereof. In the conical coil spring 5 having such a configuration, a lid frame 4 described later is used.
Since the contact area of the contact portion 5a with the back surface of the base 4a is widened, the conical coil spring 5 is interposed in a relatively stable state. A circular recess 2b is formed in a portion of the upper end surface 2a where the stud 7 is embedded. This recess 2
By attaching the lower end of the conical coil spring 5 to b,
The positioning of the conical coil spring 5 and the amount of adjustment are increased.

A bellows-shaped covering 13 made of synthetic resin, rubber, or the like and extending vertically is attached around the conical coil spring 5. Then, the inner frame 9 and the outer frame 1
Even if the concrete mortar 6 is filled in the voids due to the zero, the concrete mortar 6 is prevented from entering the inside of the cover 13, so that the conical coil spring 5 and the stud 7 are not solidified.

Therefore, even when the height of the lid frame 4 needs to be adjusted next time, the existing conical coil spring 5 and the stud 7 can be reused. A base 4 a of the lid frame 4 elastically supported by the conical coil spring 5 is attached to an upper portion of the stud 7. Then, the height and the inclination of the lid frame 4 are changed by tightening and adjusting the nut 8, so that the adjustment of the height and the inclination of the lid 3 to be attached to the upper inner surface of the lid frame 4 becomes easy.

Next, a case of raising the cover 3 will be described. First, the road 12 around the work opening 2 is excavated in a circular or square shape, and the work opening 2 is exposed by forming a drill hole 12a. Next, after the conical coil spring 5 is inserted into the stud bolt 7 stuck to the upper end face 2a of the lid frame receiving portion of the working port 2, the base 4a of the lid frame 4 is attached to the upper side of the stud bolt 7. After the attachment of the cover frame 4 is completed, a nut 8 is screwed on the stud 7, and the nut 8 is tightened so that the upper end surface of the cover frame 4 matches the height of the road 12.

At this time, since the fastening by the nut 8 is performed by tightening the four studs 7 buried in the upper end surface 2a at four places, the amount of tightening at an arbitrary place is adjusted to adjust the lid. The height and the inclination angle of the frame 4 are arbitrarily adjusted. After adjusting the height of the lid frame 4, the lid frame 4
Inside and outside, an inner frame 9 and an outer frame 10 are provided, respectively, and a space between the inner frame 9 and the outer frame 10 is filled with concrete mortar 6 and solidified. And finally,
The work is completed by repairing the pavement and the like of the excavation hole 12a excavated around the work opening 2.

As described above, since the height and the inclination angle of the lid 3 can be arbitrarily adjusted by the tightening operation of the nut 8, it is not necessary to prepare various kinds of height adjusting members, and the construction time is reduced. There are advantages such as shortening. However, in such a manhole cover height adjusting device, the upper surface 2 of the manhole 1 is determined based on the surface height of the road 12.
It is necessary to perform positioning of the manhole 1 in consideration of the drop to a, and the operation is complicated.

The stud bolt 7 stuck to the upper end surface 2a
After the height adjustment of the lid frame 4 is completed, the concrete mortar 6 filled inside the lid frame 4 is fixed by being solidified. Therefore, for example, in a cold region, an external force is applied to the stud 7 through the lid frame 4 due to the rise of the ground due to freezing, etc., so that the stud 7 is tilted. Since the height and the inclination angle of the frame 4 change, there is a problem that the adjustment needs to be performed again.

Further, when the base 4a of the lid frame 4 is attached to the inclined stud 7, the height and the inclination angle of the lid 3 can be arbitrarily adjusted by tightening the nut 8. However, when the stud 7 is tilted, the lid 3
Because the strength against the weight added to
There is also a problem that the height and the inclination angle of the lid 3 are easily changed.

To solve such a problem, FIG.
A manhole cover height adjusting device as shown in FIG. 8 has been developed. As shown in these figures, manhole 1
The large and small stacking blocks 15, 16 are stacked on the upper end surface 2a of the base. The positioning of the stacking blocks 15 and 16 with respect to the manhole 1 is performed by using the stacking blocks 15 and 1.
6 by inserting the stud 7 into the bolt insertion hole 17.

A total of four notches 18 and 19 are formed on the outer peripheral edge of each of the stacking blocks 15 and 16. Each of the notches 18 and 19 has a hook bolt 20 for lifting.
21 are provided. The stacking of the stacking blocks 15 and 16 on the manhole 1 is performed by each of the lifting hook bolts 2.
This is facilitated by lifting each of them via 0 and 21 and sequentially stacking them.

In the manhole cover height adjusting device having such a configuration, an appropriate number of each of the stacking blocks 15 and 16 are stacked on the manhole 1 so that the surface height of the road 12 and the upper end surface of the manhole 1 can be adjusted. The head can be easily adjusted. Each stud 7 is accommodated in the notch groove 19 of the stacking block 16 and the hook bolt 21 for lifting, and a certain degree of relief against external force applied to the stud 7 due to rising of the ground surface due to freezing. Can have. For this reason, even if the freezing is thawed, the height and the inclination of the lid frame 4 do not change, so that it is not necessary to adjust the frequency frequently.

Further, even when external force is applied to the stud 7, the stud 7 is supported by the notch groove 19 and the lifting hook bolt 21, and the base 4 a of the lid frame 4 is formed.
Can be attached to the stud 7 in an appropriate state, so that the strength against the weight applied to the lid 3 can be improved.

[0018]

However, in the above-mentioned conventional manhole cover height adjusting device, when the conical coil spring 5 is inserted into the stud 7, a part of the lower end thereof is cut off the stacking block 16. It tilts because it falls into the notch 19. Also, since a part of the lower end of the conical coil spring 5 abuts on the surface of the stacking block 16, the conical coil spring 5 is in an unstable state with respect to the stacking block 16.

Therefore, when the nut 8 is tightened in such a state, a phenomenon occurs in which the conical coil spring 5 contracts in an inclined state. As described above, when the conical coil spring 5 contracts in an inclined state,
A loss occurs in the urging force of the conical coil spring 5 on the base 4a of the lid frame 4 or the direction of the supporting force of the conical coil spring 5 on the base 4a of the lid frame 4 makes it impossible to obtain an appropriate urging force. There was a problem that
Further, when an appropriate urging force by the conical coil spring 5 cannot be obtained, the tightening operation with the nut 8 needs to be performed again, resulting in a problem that the construction time is prolonged.

The present invention has been made in view of such circumstances, and it is possible to easily and reliably adjust the height and inclination of the road surface of the lid, and to greatly reduce the construction time. It is an object of the present invention to provide a manhole cover height adjusting device that can be designed.

[0021]

In order to achieve the above object, the present invention provides a manhole cover height adjusting device for adjusting a manhole cover laid under a road or the like to a road surface height. A lid frame for attaching the lid is attached to the plurality of studs embedded in the upper end surface of the manhole, and between the upper part of the manhole and the lid frame at a position separated from the stud. Is characterized in that a conical coil spring elastically supporting the lid frame is interposed, and the height of the lid frame is adjusted by screwing a nut to the stud.

[0022]

According to the manhole cover height adjusting device of the present invention, a cone coil spring for elastically supporting the cover frame is interposed between the studs embedded in the upper end surface of the manhole, and the studs are attached to the studs. After attaching the lid frame for attaching the lid,
The height of the lid frame was adjusted by screwing a nut to the stud. Therefore, for example, a part of the lower end portion of the conical coil spring 5 which has conventionally been generated is formed by the notch groove 1.
Since the inclination and instability caused by dropping into the position 9 are prevented, the height adjustment of the lid 3 becomes easy and reliable.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, the same parts as those in FIGS. 7 and 8 are denoted by the same reference numerals, and redundant description will be omitted. FIGS. 1 and 2 show an embodiment of a manhole cover height adjusting device according to the present invention. The upper end of a manhole 1 provided below a road 12 or the like serves as an entrance to the ground. The mouth 2 is formed. In the upper end surface 2a of the manhole 1, an implantation hole 2b in which the implantation bolt 7 is implanted.
Are formed. The lower end of the stud 7 is fixed to the stud 2b.

On the upper end surface 2a of the manhole 1, large and small stacking blocks 15, 16 are stacked. The positioning of the stacking blocks 15 and 16 with respect to the manhole 1 is performed by inserting the studs 7 into the bolt insertion holes 17 of the stacking blocks 15 and 16. A total of four notched grooves 18 and 19 are formed on the outer peripheral edge of each of the stacking blocks 15 and 16. Notch grooves 18, 19
Are provided with lifting hook bolts 20 and 21. And the stacking block 15 on the manhole 1,
The stacking of 16 can be easily performed by lifting each of them via the lifting hook bolts 20 and 21 and sequentially stacking them.

The base 4a of the lid frame 4 is mounted on the top of the stacking block 16 located at the uppermost stage. A conical coil spring 5 shown in FIG. 5 or FIG. 6 is interposed between the base 4a where the studs 7 are removed and the uppermost stacking block 16. The base 4a of the lid frame 4 is elastically supported. The pressing force against the urging force of the conical coil spring 5 can be changed by adjusting the tightening force of the nut 8 at each tightening location, so that the height and inclination of the lid frame 4 change, and the upper inner surface of the lid frame 4 changes. It is possible to adjust the height and angle of the lid 3 to be attached to the camera.

The operation of raising the cover 3 by the manhole cover height adjusting device having such a configuration is performed as follows. First, the road 12 around the working opening 2 is excavated in a circular or square shape to form a drilling hole 12 a to expose the working opening 2.
Next, the stacking blocks 15 and 16 are stacked on the manhole 1 and height adjustment with respect to the surface of the road 12 is performed. When the stacking blocks 15 and 16 are stacked, they are lifted via the lifting hook bolts 20 and 21 and sequentially stacked. At this time, the positioning of the stacking blocks 15, 16 with respect to the manhole 1 is determined by the respective stacking blocks 15, 1
6 by inserting the stud 7 into the bolt insertion hole 17.

After the stacking operation of the stacking blocks 15 and 16 is completed, four conical coil springs 5 shown in FIG. 5 or FIG. 6 are mounted on the uppermost stacking block 16. When the conical coil spring 5 is mounted, it is preferable that the conical coil spring 5 be positioned at substantially the center between the studs 7 in terms of balance. After that, the stud 4 is attached to each stud 7.
The base 4a is mounted.

After the mounting of the base 4a of the lid frame 4 is completed,
A nut 8 is screwed on the top of the stud 7, and the tightening force of the nut 8 is adjusted so that the upper end surface of the lid frame 4 matches the height of the road 12. At this time, the fastening by the nut 8 is performed by tightening the four studs 7 buried in the upper end surface 2a at four places. The height and the tilt angle are arbitrarily adjusted. After the height adjustment of the lid frame 4 is completed, the pavement of the excavation hole 12a excavated around the work opening 2 is repaired. This completes the construction.

As described above, in this embodiment, the manhole 1
The stacking blocks 15, 16 are inserted into the bolt insertion holes 17 of the stacking blocks 15, 16 through the four studs 7 buried in the upper end surface 2a, and the stacking blocks 15, 16 are stacked while being positioned. The conical coil spring 5 is interposed between the stacking block 16 from which the stud 7 is removed and the base 4a of the lid frame 4. Next, these studs 7
The height and angle of the lid 3 to be mounted on the upper inner surface of the lid frame 4 are adjusted by mounting the base 4a of the lid frame 4 and further tightening the nut 8.

Therefore, since the conical coil spring 5 is mounted at a position off the notch groove 19 on the stacking block 16, a part of the lower end of the conical coil spring 5, which has been a problem in the related art, is cut off. It is possible to solve the problem that the inclination is caused by dropping into the notch groove 19 and the conical coil spring 5 is placed in an unstable state.

As a result, since the conical coil spring 5 can be contracted while maintaining the fixed posture, the base 4 of the lid frame 4 can be contracted.
It is possible to obtain an appropriate urging force of the conical coil spring 5 without causing a loss in the urging force of the conical coil spring 5 to “a”. As a result, the height and the inclination angle of the lid 3 can be arbitrarily and reliably adjusted only by the tightening operation of the nut 8, so that the construction time can be significantly reduced. In the present embodiment, the case where four conical coil springs 5 are interposed on the lower surface side of the base 4a of the lid frame 4 has been described.
You may make it intervene more than pieces.

In this embodiment, the stacking block 16
The case where the conical coil spring 5 is simply placed at a position deviated from the upper notch groove 19 has been described. However, the present invention is not limited to this example, and a concave portion is provided on the stacking block 16 where the conical coil spring 5 is to be placed. The positioning of the conical coil spring 5 may be performed.

[0033]

As described above, according to the manhole cover height adjusting apparatus of the present invention, the cone for elastically supporting the cover frame between the studs embedded in the upper end surface of the manhole. After attaching a lid frame for attaching the lid to each stud with a coil spring interposed, the height of the lid frame was adjusted by screwing a nut to the stud. Therefore, for example, the inclination and instability caused by a part of the lower end of the conical coil spring 5 falling into the notch groove 19, which is conventionally generated, is prevented, so that the height adjustment of the lid 3 is easy and reliable. And the construction time can be shortened.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a manhole cover height adjusting device according to the present invention.

FIG. 2 is a plan view showing a main part of FIG.

FIG. 3 is a cross-sectional view showing an example of a conventional manhole cover height adjusting device.

FIG. 4 is a plan view showing a main part of FIG. 3;

FIG. 5 is a perspective view showing an example of a conical coil inserted into the stud of FIG. 3;

FIG. 6 is a perspective view showing another example of the conical coil inserted into the stud of FIG. 3;

FIG. 7 is a perspective view showing another example of a conventional manhole cover height adjusting device.

8 is a cross-sectional view illustrating the manhole cover height adjusting device of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Working opening 2a Top end surface 3 Lid 4 Lid frame 4a Base 5 Conical coil spring 6 Concrete mortar 7 Stud bolt 8 Nut 9 Inner frame 10 Outer frame 15, 16 Stacking block 17 Bolt insertion hole 18, 19 Notch groove 20 , 21 Hook bolts for lifting

Claims (1)

(57) [Claims] 1. A manhole cover height adjusting device for adjusting a cover of a manhole laid under a road or the like to a road surface height, wherein a plurality of studs embedded in an upper end surface of the manhole include A lid frame for attaching the lid body is mounted, and between the upper part of the manhole at a position deviated from the stud and the lid frame, a conical coil spring elastically supporting the lid frame is interposed. The height of the lid frame is adjusted by screwing a nut to the stud, thereby adjusting the height of the lid of the manhole.