JP3498951B2 - Intermediate slab for manhole - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermediate slab which is a landing installed at a manhole body connecting portion of a prefabricated manhole.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
1. A vertical hole 32 having a large diameter is bored from 1, and a concrete is cast on the peripheral surface of the vertical hole 32 to form a manhole skeleton 33, and the manhole skeleton 33 has a lowermost end 34. An operator enters and exits through a small-diameter entrance manhole 36 in order to inspect, repair, and clean the sewage pipes, communication lines, etc. 35 arranged. Since the manhole skeleton 33 is composed of a vertically elongated hole, a multi-step footrest 37 is arranged on the peripheral wall of the manhole skeleton 33, and a plurality of intermediate slabs ( A landing) 38 is installed, and a manhole 39 through which a worker can enter and exit is formed in each slab 38, and the manhole 39 is normally closed by a manhole cover 40.

Then, in order to perform the inspection, repair, cleaning of the pipe, etc., the worker enters the manhole skeleton body 33 from the entrance manhole 36 by using the foot rest 37, and the foot rest also in the skeleton body 33. Use the tool 37 to reach the first slab 38,
Next, the manhole cover 40 installed on the slab 38
Open and open the slab 38 to the next slab 38 using the foot rest 37, and repeat this to lower the lowermost part 3 of the manhole skeleton 33.
After reaching 4, the above-mentioned inspection, repair, and pipe cleaning are to be performed.

As the means for installing the slab 38, as shown in, for example, Utility Model Registration No. 3004574, the manhole skeleton 33 is supported by a bracket or the like, or the inner circumference of the manhole skeleton 33. A ring-shaped groove is formed along the wall surface, and the slab 38 is formed in the groove.
There is a thing that hits the outer circumference of the site.

[0005]

By the way, it is difficult to mount the bracket in the case of using the bracket, and it is difficult to form the groove in the case of using the groove.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to utilize a manhole body connecting portion of an assembling manhole, It aims to provide an intermediate slab for manholes in which the slab can be easily and easily installed in the manhole body and the slab can be used safely.

In addition, the slab is easier and easier to use.
It aims to provide an intermediate slab for manholes that can be installed, adjusted, and replaced on the skeleton.

[0008]

In order to achieve the above object, an intermediate slab for a manhole according to the present invention comprises an slab receiving frame, a grating and a grating reinforcing member. Is for holding the reinforcing member formed on the outer peripheral end side located inside the connecting part, the through grooves of the connecting part fastening bolts formed on the end part side, and the inner peripheral end side surface of the slab receiving frame. It is characterized in that it is provided with a concave groove and a plurality of ridges for slab positioning formed on the back surface of the intermediate portion of the inner and outer circumferences.

The grating is composed of two divided bodies, and each divided body is connected by a hinge.

[0010]

1 to 7 relate to an embodiment of the present invention. FIG. 1 shows an intermediate slab for a manhole according to the present invention installed on a manhole body of a prefabricated manhole. FIG. 2 is a cross-sectional side view of the manhole intermediate slab installed in the manhole skeleton connecting portion of the assembling manhole. FIG. 3 is a sectional view taken along line AA of FIG. 2 is a partially enlarged sectional view of FIG. 4, FIG. 4 is a plan view of the slab receiving frame, and FIG.
6 is a rear view of FIG. 4, and FIG. 7 is an enlarged cross-sectional view of CC of FIG.

In the figure, reference numeral 1 is an intermediate slab for a manhole, and the slab 1 is composed of a slab receiving frame 2, a grating 3 and a grating reinforcing member 4, and is an assembly type manhole manhole. Connection parts 6, 6, ...
It is supposed to be installed in.

The slab receiving frame 2 is formed in an arc shape, for example, of a hard synthetic resin material in which an iron plate 7 is embedded in the entire circumference, and has an outer peripheral end side 8 located in the connecting portion 6 and a plurality of outer peripheral end portions. Through-grooves 10 and 1 of individually formed connecting portion fastening bolts 9
0, ..., Retaining grooves 11, 11 for holding the reinforcing member 4 formed on the inner peripheral end side surface of the slab receiving frame 2, and a plurality of slab positioning projections formed on the intermediate rear surface of the inner and outer peripheries. It is composed of articles 12, 12, ....

The grating 3 is a perforated plate integrally formed with a lattice, for example, of a hard synthetic resin material, and is mounted on the slab receiving frame 2 at a substantially intermediate portion on the inner and outer circumferences thereof. And
A manhole 14 for mounting the manhole cover 13 is formed on the grating 3, and the manhole cover 13 is normally mounted on the manhole 14 via a receiving frame 15. A plurality of reflectors 16, 16, ... Are arranged around the upper surfaces of the grating 3 and the manhole cover 13.

The grating reinforcing member 4 is formed of, for example, a hard synthetic resin material into a square rod shape, and the slab receiving frame 2 is provided.
Both ends of the reinforcing member 4 are inserted into the holding grooves 11 formed on the slab and installed on the slab receiving frame 2 to form the grating 3
It becomes a reinforcing member of.

An intermediate slab 1 for a manhole having the above-mentioned structure, and when stacking the manhole skeleton 5 of an assembling manhole, the outer periphery of the slab receiving frame 2 is placed on the manhole skeleton 5 at the top. End side 8 is arranged and another manhole skeleton 5
Is placed so that the outer peripheral side 8 is sandwiched between the connecting portions 6 of the manhole skeletons 5, 5. At this time, the slab receiving frame 2
The position of the slab receiving frame 2 can be easily determined by reliably contacting the inner walls of the manhole body 5 with a plurality of slab positioning ridges 12, 12, ... You can , Which were previously formed at a plurality of locations on the inner wall of the manhole skeleton 5, are opposed to the through grooves 10, 10, ... Formed on the outer peripheral end side of the slab receiving frame 2, and the fastening bolts are attached. By tightening with 9 (see FIG. 3), the slab receiving frame 2 is securely installed on the manhole frame 5. When the slab receiving frame 2 is installed, the reinforcing member 4 is inserted into the holding grooves 11 formed in the slab receiving frame 2,
By placing the grating 3 on the upper surface of the slab receiving frame 2, the manhole intermediate slab 1 can be easily and easily installed on the manhole skeleton 5.

The grating 3 is composed of two divided bodies 18 and 19, and each divided body 18 and 19 is a hinge 2.
It is also possible to connect by 0 and 20. in this case,
When the intermediate slab 1 for manholes is used for a long period of time and the slab receiving frame 2 becomes loose or needs to be replaced,
Even when the grating 3 is still placed on the slab receiving frame 2, the split body 19 is pulled up, the manhole cover 13 is removed, and the connecting portion fastening bolts 9 are tightened from the through grooves 10, 10 ,. ， Since it can be easily loosened, it is easy to adjust and replace the slab support frame 2.
Can be easy.

[0017]

In the manhole intermediate slab according to the present invention, the intermediate slab includes the slab receiving frame, the grating, and the grating reinforcing member, and the slab receiving frame is located on the outer peripheral end side located in the connecting portion. A plurality of through-grooves for connecting portion tightening bolts formed on the end side, a holding groove for a reinforcing member formed on the inner peripheral end side surface of the slab receiving frame, and a rear surface of the inner and outer peripheral portions. Since it has a plurality of ridges for slab positioning formed on the
The slab can be easily and easily installed on the manhole skeleton by using the skeleton connecting part, and the slab can be safely used as an intermediate slab for manholes.

Further, since the grating is composed of two divided bodies and each divided body is connected by a hinge, the slab is simpler and easier to install, adjust and replace on the manhole body. It becomes an intermediate slab for use.

[Brief description of drawings]

FIG. 1 is a plan view in which an intermediate slab for manholes according to the present invention is installed on a manhole skeleton of a prefabricated manhole.

FIG. 2 is a cross-sectional side view of the manhole intermediate slab installed in the manhole skeleton connecting portion of the assembly type manhole, and is a sectional view taken along line AA of FIG.

FIG. 3 is a partially enlarged sectional view of FIG.

FIG. 4 is a plan view of a slab receiving frame.

5 is a sectional view taken along line BB of FIG.

6 is a rear view of FIG.

FIG. 7 is an enlarged sectional view taken along line CC of FIG.

FIG. 8 is a cross-sectional view of a conventional manhole body.

[Explanation of symbols]

1 Intermediate slab 2 slab receiving frame 3 Grating 4 Grating reinforcement members 5 Manhole body 6 connection 8 Outer peripheral side 9 Connection part tightening bolt 10 through groove 11 Retaining groove for reinforcing member 12 Protrusions for positioning 18,19 division 20 hinges

Claims (2)

(57) [Claims] 1. An intermediate slab installed at a manhole skeleton connecting portion of an assembly-type manhole, wherein the intermediate slab comprises a slab receiving frame, a grating and a grating reinforcing member, and the slab receiving frame is An outer peripheral end side located in the connection part, a plurality of through-grooves for connecting part fastening bolts formed on the end part side, and a recess for holding a reinforcing member formed on the inner peripheral end side surface of the slab receiving frame. An intermediate slab for a manhole, comprising a groove and a plurality of ridges for positioning the slab formed on the back surface of the intermediate portion of the inner and outer circumferences. 2. The intermediate slab for a manhole according to claim 1, wherein the grating is composed of two divided bodies, and each divided body is connected by a hinge.