JP2963401B2 - 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 a manhole cover height adjusting device, and more particularly to a manhole cover height adjusting device capable of easily matching the upper surface of a manhole cover with a road surface. is there.

[0002]

2. Description of the Related Art Generally, various underground pipes such as sewers, gas pipes, and power cable pipes are laid under a road surface. In such an underground conduit, manholes which are entrances and exits to the ground are provided vertically at predetermined intervals. A receiving frame is fixed to an upper portion of the manhole by an anchor bolt, and the manhole is opened and closed by a lid fitted into the receiving frame.

In such a manhole, it is natural that the upper surface of the lid and the road surface must be aligned. If the manhole is built under a horizontal road, the height of the lid can be adjusted relatively easily by inserting an adjustment ring of the same diameter as the manhole between the manhole and the lid, but the manhole is inclined. If it is built under a road surface, the height and inclination angle of the lid can be matched with the road surface without using a height adjustment device that can freely adjust the height and inclination angle of the receiving frame. Can not.
That is, the upper surface of the lid cannot be made to coincide with the road surface.

Therefore, a manhole cover height adjusting device for aligning the upper surface of the cover with the road surface is disclosed in Japanese Patent Laid-Open No. 2-282.
No. 524 publication. Hereinafter, the height adjusting device described in this publication will be referred to as “prior art 1”.

As shown in FIG. 5, the prior art 1 comprises a conical coil spring 3 fitted into a plurality (normally three) of anchor bolts 2 embedded in the upper surface of a manhole 1 so as to be adjustable in height. And on this conical coil spring 3,
The flange 5A of the receiving frame 5 into which the lid 4 is fitted is placed, and the nut 7 is tightened against the elastic force of the conical coil spring 3 until the upper surface of the lid 4 matches the road surface.

Another height adjusting device is disclosed in Japanese Utility Model Laid-Open No. 3-103803.
No. 9 discloses this. Hereinafter, the height adjusting device described in this publication will be referred to as “prior art 2”. Conventional technology 2
As shown in FIG. 6, a height adjusting screw 8 screwed to a plurality of anchor bolts 2 embedded in the upper surface of the manhole 1 so that the height can be adjusted, and the height adjusted to a predetermined height The flange 5A of the receiving frame 5 is placed on the adjusting screw 8, and the flange 5A of the receiving frame is fixed by the nut 9.

In the prior arts 1 and 2 described above, in order to finally fix the flange 5A of the receiving frame 5 to the manhole 1, as shown in FIG.
An inner frame 10 and an outer frame 11 are mounted inside and outside a gap formed between the mortar 1 and the mortar 1 in the gap surrounded by the inner frame 10 and the outer frame 11.
2 is poured in and is fixed by solidification.

[0008]

According to the above-mentioned prior art 1, since the conical coil spring 3 can be compressed until it becomes flat, there is an advantage that the height adjustment range of the lid 4 can be widened. Has the following problems. Since the resilient force of the conical coil spring 3 is so strong that the receiving frame 5 is not greatly compressed even if it is mounted thereon, it is not easy to turn the nut 7 against the resilient force of the conical coil spring 3. If the user forgets to fit the conical coil spring 3 into the anchor bolt 2, the receiving frame 5 needs to be pulled out from the anchor bolt 2 once, which is troublesome. The height and angle of the receiving frame 5 can be adjusted only at the portion where the anchor bolt 2 is located. Since the screw pitch of the anchor bolt 2 is fine, the height adjustment amount of the receiving frame 5 per one rotation of the nut 7 is small. Therefore, it takes time to adjust the height of the receiving frame 5.

On the other hand, according to the above-mentioned prior art 2, since the height adjusting screw 8 is attached to the anchor bolt 2 in advance, it does not have the above-mentioned problems, but has the following problems. ing. To turn the height adjustment screw 8, the manhole 1 and the receiving frame 5
It is difficult to turn because it is necessary to insert your hand in the narrow space between With the receiving frame 5 on the height adjusting screw 8,
When adjusting the height and the inclination angle of the frame, it is difficult to turn the height adjusting screw 8 due to the weight of the receiving frame 5. Therefore, in this case, it is necessary to lift the receiving frame 5 and turn the height adjusting screw 8 in this state, which is troublesome. As in the prior art 1, the height and angle of the receiving frame 5 can be adjusted only at the portion where the anchor bolt 2 is located. Since the screw pitch of the anchor bolt 2 is fine as in the prior art 1, the height adjustment amount of the receiving frame 5 per one rotation of the nut 7 is small. Therefore, it takes time to adjust the height of the receiving frame 5.

Accordingly, it is an object of the present invention to adjust the height of the lid easily and to adjust the height and angle of the receiving frame 5 even in a portion where no anchor bolt is provided. It is an object of the present invention to provide a manhole cover height adjusting device capable of adjusting the height and the inclination angle of the receiving frame even after inserting the frame into the anchor bolt.

[0011]

According to the first aspect of the present invention,
An upper surface of a lid for opening and closing a manhole constructed under a road surface, in order to match the road surface, in a height adjustment device for a manhole lid, a lid receiving frame fixed to the upper surface of the manhole by an anchor bolt. A spacer inserted between the flange and the upper surface of the manhole; and a height adjusting bolt for raising and lowering the spacer together with the receiving frame, wherein the spacer is a screw with which the height adjusting bolt is screwed. It is characterized in that it has a hole, a through hole through which the anchor bolt penetrates, and a detent projection that fits into the anchor bolt hole formed in the flange of the receiving frame.

According to a second aspect of the present invention, the height adjusting bolt is made of resin, and the upper portion is formed in a shape into which a rotating jig for rotating the height adjusting bolt can be fitted. Is characterized by the fact that

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the manhole cover height adjusting device of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing one embodiment of a manhole cover height adjusting device according to the present invention, and FIG. 2 is an example of use of the manhole cover height adjusting device of the present invention. FIG. 3 is a perspective view showing another mode of use of the manhole cover height adjusting device of the present invention, and FIG. 4 is a rotation diagram used for the manhole cover height adjusting device of the present invention. It is a perspective view which shows a jig.

As shown in FIG. 1 to FIG.
The manhole cover height adjusting device includes a spacer 13 inserted between the flange 5A of the manhole cover receiving frame 5 fixed to the upper surface of the manhole 1 by the anchor bolt 2 and the upper surface of the manhole 1; Frame 5
And height adjusting bolts 14 for raising and lowering the spacer 13 with the.

The spacer 13 includes a height adjusting bolt 14.
Is screwed into the screw hole 13A, the through hole 13B through which the anchor bolt 2 penetrates, and the hole for the anchor bolt formed in the flange 5A of the receiving frame 5, ie, the detent for fitting into the oblong hole 6A or the short circular hole 6B. It has a projection 13C. The height adjusting bolt 14 is made of resin, and the upper portion 14A is formed in a prismatic shape so that a rotating jig 15 for rotating the height adjusting bolt 14 can be fitted.

According to the manhole cover height adjusting device of the present invention configured as described above, the height of the manhole cover is adjusted as follows. First,
As shown in FIG. 2, the anchor bolt 2 fixed on the manhole 1 is inserted into the through hole 13B of the spacer 13 and the oval hole 6A formed in the flange 5A of the receiving frame 5, and the projection 13C of the spacer 13 is elongated. The spacer 13 is set between the manhole 1 and the receiving frame 5 so as to fit into the circular hole 6A.

Next, the height adjusting bolt 14 is connected to the flange 5.
A screw 13A is screwed into the screw hole 13A of the spacer 13 from the oval hole 6A of A, and the length of the height adjusting bolt 14 protruding from below the spacer 13 is adjusted so that the upper surface of the manhole cover matches the road surface.

The rotation of the height adjusting bolt 14 can be easily performed manually by using a rotating jig 15 as shown in FIG. Even if the height adjustment bolt 14 is turned,
Since the anchor bolt 2 is inserted into the elongated hole 6A of the flange 5A, the spacer 13 does not rotate together.

When the height and the inclination angle of the receiving frame 5 are determined in this way, the height adjusting bolt 14 protruding from the oblong hole 6A of the flange 5A is folded. This is to remove an extra height adjusting bolt portion. As described above, the fixing of the receiving frame 5 is performed by attaching the inner frame and the outer frame to the inside and outside of the gap formed between the manhole 1 and the flange 5A of the receiving frame 5, and surrounded by the inner frame and the outer frame. It is performed by pouring mortar into the gap and solidifying the mortar.

In the above-described example, the anchor bolt 2, the height adjusting bolt 14 and the projection 13C of the spacer 13 are inserted into one oval hole 6A of the flange 5A, as shown in FIG. The anchor bolt 2 is inserted into the oblong hole 6A of the flange 5A, and the height adjusting bolt 14 and the spacer 1 are inserted into one short hole 6B of the flange 5A.
The third protrusion 13C may be inserted.

In this case, the spacer 13 can be set at a portion other than the anchor bolt 2. Moreover, even if the height adjusting bolt 14 is turned, the spacer 13
Is inserted into the short circular hole 6B of the flange 5A, so that the spacer 13 does not rotate together.

[0023]

As described above, the present invention has the following useful effects. The upper part of the height adjustment bolt protrudes from the flange of the receiving frame and can be easily turned from outside using a rotating jig, so even if the receiving frame is on the spacer, easily turn the height adjusting bolt be able to. Since the co-rotation preventing protrusion is formed on the spacer, the spacer can be set at any position of the oblong hole and the short circular hole of the flange of the receiving frame without co-rotating. Moreover, in this case, even after the anchor bolt is inserted into the oval hole, the spacer can be easily set between the receiving frame and the manhole. By making the height adjusting bolts made of resin, after the receiving frame is finally fixed, excess portions can be easily folded and removed. Instead of using the screws of the anchor bolts to raise and lower the receiving frame, the height of the receiving frame is raised and lowered by the height adjusting bolts. The amount of height adjustment of the receiving frame can be increased.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing an example of a use mode of the manhole cover height adjusting device of the present invention.

FIG. 3 is a perspective view showing another use mode of the manhole cover height adjusting device of the present invention.

FIG. 4 is a perspective view showing a rotating jig used in the manhole cover height adjusting device of the present invention.

FIG. 5 is a cross-sectional view showing Conventional Technique 1.

FIG. 6 is a partial cross-sectional view showing a conventional technique 2.

[Explanation of symbols]

 1: manhole 2: anchor bolt 3: conical coil spring 4: lid 5: receiving frame 5A: flange 6A: oblong hole 6B: short circular hole 7: nut 8: height adjustment screw 9: nut 10: inner frame 11: outer frame 12: Mortar 13: Spacer 13A: Screw hole 13B: Through hole 13C: Projection 14: Height adjusting bolt 14A: Upper part 15: Rotating jig

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 52-14757 (JP, A) JP-A 54-149158 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 29/12

Claims (2)

(57) [Claims] 1. A manhole cover height adjusting device for matching an upper surface of a cover for opening and closing a manhole constructed under a road surface with the road surface, wherein the manhole cover is fixed to an upper surface of the manhole by an anchor bolt. A spacer inserted between the flange of the lid receiving frame and the upper surface of the manhole, and a height adjusting bolt for raising and lowering the spacer together with the receiving frame,
The spacer includes a screw hole into which the height adjusting bolt is screwed, a through hole through which the anchor bolt penetrates, and a detent projection for fitting into the anchor bolt hole formed in the flange of the receiving frame. A height adjustment device for a manhole cover, comprising: 2. The method according to claim 1, wherein the height adjusting bolt is made of resin, and an upper portion thereof is formed in a shape into which a rotating jig for rotating the height adjusting bolt can be fitted. The height adjusting device for a manhole cover according to claim 1, wherein