JPS60109427A - Manhole - Google Patents

Abstract

PURPOSE:To simply adjust the height of a manhole by exchanging blocks by a method in which a block for adjusting heights is detachably fitted into a guide groove provided in the inner surface of a basic ring, and a cover-receiving ring is placed on the block to form a manhole. CONSTITUTION:Guide grooves 5 for height-regulating blocks are formed at three or more positions along the circumferential direction on the inner surface of a basic ring 1, and projections 26 are provided to the periphery of the height-regulating blocks 2 to be guided by the guide grooves 5. A cover-receiving ring 4, having a tiered portion 4a receiving the cover on its inner surface and projections 9 to couple with stopper groove 6 formed on the inner surface of the basic ring 1 on its periphery, is inserted into the basic ring 1. The height of manhole can thus be simply adjusted only by exchanging the height-regulating blocks 2 of different heights and the manhole is thus most suitable for ones in snowy countries.

Description

[Detailed description of the invention] The present invention relates to a height-adjustable manhole.

In snowy regions, spiked tires are used when it snows, which causes roads to be scraped and lowered in height.

As a result, the manhole installed on the road protrudes relatively from the road. For this reason, when a snowplow passes by, there is a problem in that the protruding manhole is likely to be damaged, broken, or otherwise damaged. Also, when resurfacing roads in early spring, the standard height is increased to account for the amount of road removal. For this reason, in the conventional structure in which the height of the manhole is fixed, there is a problem in that the manhole is relatively sunken.

For this reason, the inventor of the present invention first considered a method in which the cover ring is screwed into the base ring, and the height of the manhole is adjusted depending on the screwing position.

However, since the lid holder ring is heavy and thick, there are problems such as time-consuming adjustment work.

The present invention has been made in view of the above circumstances, and its purpose is to provide a manhole whose height can be easily adjusted. a base ring having three or more height adjustment block guide grooves formed along the height adjustment block; a height adjustment block having a fitting protrusion that is removably fitted into the guide groove; and a height adjustment block that is fitted into the foundation ring to adjust the height. The lid holder placed on the block is characterized by comprising a ring.

The present invention will be described below based on illustrated embodiments. FIG. 1 is an exploded perspective view of the manhole, FIG. 2 is a sectional view thereof, FIGS. 3 and 4 are explanatory views of the operation, and FIG. 5 is a sectional view when the manhole is lowered. This manhole consists of a foundation ring 1 that is embedded in the road, a height adjustment block 2 that is attached to the inner peripheral surface of this foundation ring 1, and a lid 3 that fits inside the foundation ring 1 and has a lid 3 on the top. The lid holder on which the lid is placed is equipped with a ring 4.

On the inner circumferential surface of the foundation ring 1, height adjustment block guide grooves 5... and stopper grooves 6... are arranged at three locations in the circumferential direction. Each guide groove 5... has protruding pieces 8, 8 attached to the side wall surfaces of a pair of groove-like gaps 7, 7 forming a rectangular parallelepiped shape, making the insides of the gaps 7, 7 rectangular in cross section, and the surface It has a U-shaped cross section (or an inverted U-shaped cross section). The stopper groove 6 is formed between the cavities 117 and 7 along the axial direction of the inner circumferential surface of the foundation ring 1, and does not penetrate through the upper end of the foundation ring 1 but extends halfway to form an upper wall. , this is used as a stopper. Further, a step portion 1a on which a height adjustment block 2 is placed is formed at the lower part of the inner peripheral surface of the foundation ring 1.

The height adjustment block 2 attached to this foundation ring 1 is
A fitting protrusion is formed on the outer surface of the main body 2a which is curved along the inner peripheral surface of the base ring 1. This protrusion protrudes from a pair of insertion pieces 2b, 2b.

Locking pieces 2a and 2c are provided on 2b to protrude laterally. Here, the insertion pieces 2b, 2b are formed with an interval and width that allow them to be inserted into the side gaps between the gaps 7, 7 and the protruding pieces 8, 8, and the locking pieces 2a, 2c are and the protruding pieces 8, 8 are formed at intervals and widths that can be inserted into the upper gaps.

On the other hand, the ring 4 of the lid holder has a stepped portion 4a formed on the inner peripheral surface,
The lid 3 is placed here. In addition, protrusions 9 that can be protruded and retracted are provided at three locations in the circumferential direction on the outer peripheral surface, and these protrusions 9 and
. . . protrudes into the stopper groove 6 . Then, it is inserted into the foundation ring 1, and the height adjustment block 2...
・It is placed on top.

A manhole constructed in this manner is assembled as follows.

First, as shown in FIG. 3, the lid holder pulls up the block 4 upward. In this case, since the protrusion 9 is caught on the upper end of the stopper groove 6, the lid holder block 4 will not come off from the base block 1.

In this state, hold the prepared height adjustment block 2 of a predetermined height and insert the insertion pieces 2b, 2b and the locking pieces 2c, 2c into the space 7.
, 7, and lowered in the inserted state to place the height adjustment block 2 on the bottom surface of the foundation block 1. In this case, the locking piece 2c is di-blocked by the protruding piece 8, and the height adjustment block 2 will not come off.

Next, when the ring 4 is lowered, the lid holder is placed on the height adjustment block 2, and the ring 4 of the lid holder protrudes from the base block 1 by 20 minutes of the height adjustment block. Then, the lid holder places the lid 3 on the ring 4, and the work is completed.

On the other hand, in order to lower the manhole as shown in Fig. 5, remove the height adjustment block 2 by performing the operation opposite to the above operation, and then remove the height adjustment block 2 from the lower height adjustment block
This is done by attaching ' by the operation described above.

In the above embodiment, the guide grooves were formed at three locations, but there were four guide grooves.
It may be more than one location. Further, the mounting mechanism for the guide groove and the height adjustment block is not limited to the above embodiment. In short, it is sufficient if the height adjustment block can be detachably attached. Furthermore, although the embodiments have described height adjustment using two types of height adjustment blocks, it goes without saying that three or more types may be used.

As explained above, according to the present invention, the height of the manhole can be adjusted by simply replacing it with a height adjustment block of a different height, making it extremely effective as a manhole in snowy areas.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an exploded perspective view of a manhole, Fig. 2 is a sectional view, Figs. 3 and 4 are illustrations of height adjustment, and Fig. 5 is an illustration of height adjustment. It is a sectional view when using a different height adjustment block. DESCRIPTION OF SYMBOLS 1... Foundation ring, 1a... Step part, 2... Height adjustment block, 2a... Main body, 2b... Insertion piece, 2c
... Locking piece, 3 ... Lid, 4 ... Lid holder is ring, 4
a...Stepped portion, 5...Height adjustment block guide groove, 6...
・Stopper groove, 7...Gap, 8...Protruding piece, 9...
·protrusion.

Claims (1)

[Claims] A base ring in which three or more height adjustment block guide grooves are formed along the circumferential direction of the inner circumferential surface, a height adjustment block equipped with a fitting protrusion that is removably fitted into the guide groove, and a height adjustment block in the base ring. A manhole comprising a ring and a lid holder that is fitted and placed on a height adjustment block.