JP2691339B2 - Manhole pipe mounting block manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method for manufacturing a pipe mounting block for a manhole in which an inflow pipe and an outflow pipe are connected.

[0002]

2. Description of the Related Art A manhole is a starting point of a pipe, a place where the direction and gradient of the pipe change, a diameter of the pipe changes, a drop portion of the pipe, a place where the pipes meet, and a pipe. It will always be provided where it is necessary for maintenance.

There are three types of manhole construction methods: one that is cast in situ on the whole, one that is cast on the bottom and is piled with ready-made concrete blocks, and one that is constructed entirely using ready-made concrete blocks. There is.

Recently, in order to facilitate construction and shorten the construction period, there are many examples of assembly manholes that use ready-made concrete blocks for both the upper and lower parts. As shown in FIGS. 6 to 7, this assembly manhole has a pipe mounting block b installed on a bottom slab a, a plurality of straight wall blocks c stacked on it, and a rear slanted wall block d installed thereon. The adjustment ring e was placed on the adjustment ring e, and the lid plate g was attached to the lid receiving frame f fixed to the adjustment ring e. Then, the inflow pipe h and the outflow pipe i are connected to the pipe mounting block b,
Inverted j has a groove-like flow path k having ends of both pipes.
The water flowing through the inflow pipe h into the manhole m flows through the flow passage k to the outflow pipe i.

However, even in the case of constructing such an assembled manhole, what must be formed by on-site construction is the invert performed as the final finishing of the manhole construction. The formation of this invert is performed by placing invert concrete on the bottom of the manhole, and then forming the groove-like flow path k that is suitable for the connection angle between the inflow pipe and the outflow pipe, the difference in the height of both pipes, etc. It was done by a worker who entered the interior from above and finished plastering.

[0006]

By the way, the inner diameter of the manhole is 150 cm at the maximum, and when it is small, it is only about 75 cm. Therefore, it is difficult for a worker to enter from above the manhole and finish plastering in a narrow space at the bottom because the space is very small. . Moreover, since there is no scaffolding for work, it is necessary to put a foot on step n, or to grasp the step with one hand and finish plastering with the other hand. I had a bad problem.

In addition, when forming the flow path, it is necessary to finish plastering the concrete after the concrete has been slightly hardened in order to prevent the shape of the invert concrete from being deformed. Therefore, it takes a lot of days to finish and the construction period is prolonged. There was also a problem.

As a solution to these problems, it is conceivable to form a tube mounting block with an invert into a frame. However, this leads to a great variety of pipe mounting blocks to be manufactured.

This is because there are many kinds of manholes having different inner diameters and inner diameters, and the flow paths are not only straight but also bent into L-shape or Y-shape, and the bending The degree also varies depending on the degree of bending arrangement of the inflow pipe and the outflow pipe, and in addition, since the drop of the flow path varies depending on the site, the pipe diameter of the inflow pipe and the laying angle of the inflow pipe with respect to the outflow pipe, This is because the invert corresponding to the height of the head of the inflow pipe with respect to the outflow pipe must be formed for each size of the manhole.

As a result, a large number of molds are required to deal with this, and there is a problem that the manufacturing cost is very high. Therefore, even if it is possible to manufacture blocks in a certain range, it will be difficult for one company to cover all types, so it will be necessary to manufacture certain types of manufacturing bases dispersed throughout the country. Ah If so,
Even if one of the blocks is to be transported to the construction site, it is likely that the block will be procured from a remote place, resulting in a very uneconomical problem in terms of transportation cost.

In view of these problems of the prior art, it is an object of the present invention to provide a method for manufacturing a pipe mounting block which is inexpensive and can be manufactured in a short period of time while being manufactured in a factory.

[0012]

The present invention employs the following means to solve the above-mentioned problems. That is, the method for manufacturing a pipe mounting block for a manhole according to the present invention is a manufacturing method for manufacturing a pipe mounting block arranged at the bottom of a manhole by using a block main body having a bottomed cylindrical shape that opens upward.

The height of the block body is set so that an operator located outside the body can insert a hand into the body through the upper end opening and perform plastering work for invert formation. The connection hole for the outflow pipe of the manhole is formed in the peripheral wall portion on the bottom side. In the block body, based on the data of the pipe diameter of the inflow pipe of the manhole at the installation site of the manhole, the laying angle of the inflow pipe with respect to the outflow pipe, and the height of the head of the inflow pipe with respect to the outflow pipe, the position of the connection hole of the inflow pipe And decide the size and punch. Then, while pouring concrete for inversion from the upper end opening of the block main body, an operator inserts his / her hand into the block main body from the outside of the main body through the upper end opening, and the inflow is caused by plastering work. It is characterized in that a groove-shaped flow path is formed to connect the connection hole of the pipe and the connection hole of the outflow pipe.

In the above-mentioned manufacturing method, it is preferable to use a form in order to arrange the rough shape of the groove-like flow path connecting the connection hole of the inflow pipe and the connection hole of the outflow pipe when pouring the invert concrete.

In the manufacturing method of the present invention, the lower end of the connection hole of the outflow pipe is, for example, about 1 from the bottom surface of the block body.
Set to a height of 6 cm.

[0016]

According to the present invention, since the pipe mounting block is formed with a bottom, it is not necessary to provide a bottom formwork when placing the invert concrete. And the height of the block body,
Since it is set so that the plastering work can be performed from the outside, the plastering work can be performed by inserting a hand into the main body through the upper end opening portion of the block main body without the operator entering the block main body.

In general, the height of the lower end of the connection hole of the outflow pipe from the bottom surface of the pipe mounting block is often about 16 cm, so that by setting this height to about 16 cm, the same value can be obtained. Can be used to manufacture various tube mounting blocks.

Furthermore, since the invert is formed by plastering, it is possible to form a special form even if the straight line is originally an L-shaped or Y-shaped flow path based on the data at the manhole installation site. It will be possible to manufacture a pipe mounting block that matches the site without preparing.

In particular, in the present invention, when a mold for adjusting the rough shape of the required flow path is used, the work efficiency of plastering can be improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The manufacturing method of the present invention will be described below with reference to the drawings, taking as an example the case of manufacturing a pipe mounting block for a manhole having a straight groove-like flow path.

FIG. 1 shows a cylindrical block main body 1 which is used in the present invention and which has an open bottom and has a bottom, for example, a cylindrical shape. For convenience, it is set to, for example, about 120 cm. A connection hole 5 for the outflow pipe 3 (shown in FIG. 3) is provided in the peripheral wall portion 2 on the bottom side of the block body 1 such that the lower end 6 thereof is located at a height of about 16 cm from the bottom surface of the block body. There is.

The present invention uses the block main body 1 having such a configuration and uses the inflow pipe 7 at the manhole installation site.
Based on the pipe diameter (shown in FIG. 3), the laying angle of the inflow pipe 7 with respect to the outflow pipe 3, and the height of the head of the inflow pipe 7 with respect to the outflow pipe 3, the position and size of the connection hole 9 of the inflow pipe are determined. To determine the perforation. The drop is usually set to about 2 cm.

After that, while invert concrete is poured from the upper end opening 8 of the block body 1, the operator passes the upper end opening 8 from the outside of the block body 1 into the body as shown in FIG. A hand is inserted into and a plastering work (trowel finishing) 11 is performed to form a linear groove-shaped channel 10 (FIG. 3) that connects the connection hole 9 of the inflow pipe and the connection hole 5 of the outflow pipe. The groove-shaped flow channel 10 may be formed in a desired shape according to site conditions, such as an L-shape shown in FIG. 4 or a Y-shape shown in FIG. 5, in addition to the linear shape shown in FIG.

In this way, the invert 12 having the groove-shaped channel 10 is formed by the plastering work.
At that time, a rough flow path may be formed by using a flow path form frame bent in a linear shape or an L shape, and the flow path may be finished by a subsequent plastering operation. As a result, the pipe mounting block 1 shown in FIG. 3 is manufactured.

FIGS. 6 to 7 show a manhole constructed by using the pipe mounting block 1 having such a structure. The pipe mounting block 1 is installed on the bottom plate 13 and a plurality of straight wall blocks 15 are arranged thereon. The blocks are piled up and the rear slant wall block 17 is installed, the adjustment ring 18 is placed on the block 17, and the lid plate 20 is attached to the lid receiving frame 19 fixed to the adjustment ring 18. Then, the inflow pipe 7 is attached to the pipe mounting block 1.
By connecting the outflow pipe 3 and the outflow pipe 3, the ends of both pipes are connected to each other by the groove-shaped flow passage 10 provided in the invert 12, and therefore, the water flowing into the manhole from the inflow pipe 7 is prevented. It flows into the outflow pipe 3 through the flow path 10.

[0026]

The present invention has the following excellent effects,
It has many advantages both practically and economically.

That is, according to the present invention, there is no uneconomical need for an extra large number of molds as in the case of manufacturing the pipe mounting block with the invert. In addition, a pipe mounting block that meets the conditions of the manhole laying site can be easily installed from the outside of the block without being forced to perform difficult plastering work in a narrow manhole, such as when forming an invert by in-situ construction. It can be easily manufactured in a short period of time by work. In addition, since factory production is possible in this way, the manhole construction period can be shortened compared to the case where inserts are formed by on-site construction.

Further, in general, the height of the lower end of the connection hole of the outflow pipe from the bottom surface of the pipe mounting block is often constant at around 16 cm, and therefore various heights can be set by setting the height to about 16 cm. It is possible to comply with the manufacturing of the pipe mounting block.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a tubular block body.

FIG. 2 is a cross-sectional view illustrating a manufacturing method of the present invention.

FIG. 3 is a partial perspective view illustrating a formed invert.

FIG. 4 is a plan view showing another aspect of the flow path.

FIG. 5 is a plan view showing another aspect of the flow path.

FIG. 6 is a sectional view showing a manhole constructed by using the manufactured pipe mounting block.

FIG. 7 is a sectional view showing a manhole constructed by using the manufactured pipe mounting block.

[Explanation of symbols]

 1 block body 2 peripheral wall 3 outflow pipe 5 connection hole 7 inflow pipe 9 connection hole 10 flow path

Claims (3)

(57) [Claims] 1. A manufacturing method for manufacturing a pipe mounting block arranged at the bottom of a manhole by using a block main body having an open bottom and having a cylindrical shape, wherein the block main body has a height. The height of the manhole outside the main body is set so that a worker can insert his or her hand into the main body through the upper end opening and perform plastering work for invert formation, and the manhole flows out to the peripheral wall portion on the bottom side. The connection hole of the pipe is formed, and in the block body, the pipe diameter of the inflow pipe of the manhole at the installation site of the manhole, the laying angle of the inflow pipe with respect to the outflow pipe, and the head height of the inflow pipe with respect to the outflow pipe. Based on the data of 1., determine the position and size of the connection hole of the inflow pipe and punch it.After that, pour concrete for inversion from the upper end open part of the block main body and A trader inserts a hand from the outside of the main body into the block main body through the upper end opening, and forms a groove-like flow path connecting the connection hole of the inflow pipe and the connection hole of the outflow pipe by plastering. And a method for manufacturing a manhole pipe mounting block. 2. A formwork is used to arrange a rough shape of a groove-shaped flow path connecting a connection hole of an inflow pipe and a connection hole of an outflow pipe when pouring concrete for invert. The method for manufacturing a pipe mounting block for a manhole according to claim 1. 3. The method of manufacturing a pipe mounting block for a manhole according to claim 1, wherein the lower end of the connection hole of the outflow pipe is located at a height of about 16 cm from the bottom surface of the block body.