JPH06128979A - Built-up type manhole - Google Patents

Abstract

PURPOSE:To provide a built-up type manhole, which can be executed simply without requiring special technique and execution workability of which can be improved and manufacturing cost of which reduced. CONSTITUTION:In a built-up type manhole 1, a central section C is formed in a low curved surface in the top face 4a of a bottom block 4 used for constructing said manhole 1, and an invert 9 extended toward an outer circumferential surface 4b from the central section C and arranged in response to the outlet 8 of the manhole body 3 is formed to the top face 4a of the bottom block 4. A height adjusting device 11 inclining the bottom block 4 toward the outlet 8 side of the manhole body 3 is mounted to the bottom block 4, and the inclination of the bottom block 4 is adjusted by the height adjusting device 11 and fixed, thus installing the bottom block 4 onto a bottom in the manhole body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated manhole constructed using a bottom plate with an invert.

[0002]

2. Description of the Related Art Conventionally, manholes provided in sewers, waterworks and the like have been constructed by casting the bottom of the manhole. Therefore, on-site work becomes complicated,
There was a problem that it took a lot of construction time. Therefore, in recent years, a large number of prefabricated manholes using a secondary concrete product as a bottom member have been used in order to shorten the construction time and to make up for the shortage of site workers.

As such an assembly type manhole, for example, there is one as shown in FIGS. The bottom portion 52 of the assembled manhole 51 is provided with a recess connecting the inflow pipe and the outflow pipe for smoothing the flow of water, especially in sewers, and the recess is generally called an invert 53. In the case of a sewer pipe, the position of the inflow pipe 54 is higher than that of the outflow pipe 55, and the planar position is not determined, and therefore the inflow pipe 54 can be arranged in the range A to B shown in FIG. The placement will be determined by the topography of the site,
The outflow direction differs depending on the location where the inflow pipe 54 is installed. Therefore, the invert 53 attaches the mortar 56 to the bottom portion 52 of the manhole 51 as shown in FIGS. 7 and 8.
It is provided by being installed on the upper surface or by being formed on the upper surface of the bottom slab 57 of the secondary concrete product as shown in FIG. In the figure, 58 and 59 are an inlet and an outlet provided on the side wall of the manhole 51.

[0004]

However, in the conventional assembly type manhole 51 described above, the invert 53 must be formed by hand by performing the mortar 56 construction work in the manhole having a small space. The workability is very poor, it takes a lot of construction time, and the working environment is bad. Also,
Since a special technique is required for the construction work of the invert 53, it becomes more difficult to secure field workers.
On the other hand, when the bottom plate 57 produced in the factory is used, the positions of the inflow pipe 54 and the outflow pipe 55 are different each time depending on the topography of the site.
It is formed in steps of 30 to 45 degrees in the range of to 270 degrees.
Therefore, it is necessary to manufacture many molds, resulting in high cost.

The present invention has been made in view of the above circumstances, and an object thereof is to easily perform construction without requiring a special technique, to improve construction workability and reduce manufacturing cost. It is to provide a manufacturable manhole.

[0006]

In order to solve the above-mentioned problems of the prior art, in the present invention, the upper surface of the bottom slab used for constructing a manhole is formed into a curved surface having a low central portion, and the bottom slab is formed. A height adjusting device that extends from the center toward the outer peripheral surface on the upper surface of the invert and is provided to correspond to the outflow port of the manhole, and tilts the inversion plate toward the outflow side of the manhole in the bottom slab. The bottom slab is installed at the bottom of the manhole by adjusting the inclination of the bottom slab by the height adjusting device and fixing the bottom slab.

[0007]

In the assembled manhole according to the present invention, the upper surface of the bottom slab is formed to have a curved surface with a low central portion, and the upper surface of the bottom slab extends from the central portion toward the outer peripheral surface and is arranged corresponding to the manhole outlet. Inverter is provided, and the bottom slab is provided with a height adjusting device that inclines it toward the outlet side, and the bottom plate is attached to the bottom part in the manhole by adjusting and fixing the inclination of the bottom slab with the adjusting device. Since it is installed, the water that flows into the manhole will be collected at the center of the upper surface of the bottom slab regardless of the position of the inflow pipe, and will be naturally guided to the outlet through the invert. Moreover, since the bottom slab is inclined toward the outlet side by the height adjusting device, the water can be completely discharged.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

1 to 6 show an embodiment of a prefabricated manhole according to the present invention. In the figure, reference numeral 1 denotes a sewer or waterworks assembly type manhole for people to enter and leave for inspection or cleaning. The assembly type manhole 1 is a direction of sewer / water supply pipe, gradient or pipe diameter. It is a facility that is provided at the location where the changes in the pipe and the location where the pipes are connected and joined.

The assembling type manhole 1 is a cylindrical manhole body 3 provided on the top of the bottom concrete 2.
It is composed of a lid (not shown) that closes the upper opening of the manhole body 3, a bottom plate 4 with an invert installed at the bottom of the manhole body 3, and the outer wall of the manhole body 3 is substantially orthogonal to the lid. An inflow pipe 5 and an outflow pipe 6 extending in the direction of the arrow are provided so as to penetrate therethrough. For this reason, on the peripheral wall of the manhole body 3, an inflow port 7 and an outflow port 8 that connect one ends of the inflow pipe 5 and the outflow pipe 6 are provided at intervals in the circumferential direction.

On the other hand, the bottom plate 4 is integrally molded in a disk shape, and the entire upper surface 4a thereof is formed in a curved surface (concave surface) having a low central portion C as shown in FIGS. Further, on the upper surface 4a of the bottom plate 4, an invert 9 having an arcuate cross section extending from the central portion C toward the outer peripheral surface 4b is provided.
The invert 9 is arranged such that the opening 9a facing the outer peripheral surface 4b corresponds to the position of the outflow port 8 of the manhole body 3 when the bottom plate 4 is fixed. Then, the invert 9 is formed in a concave groove that widens toward the outer peripheral surface 4b side of the bottom slab 4 and has a downward slope, so that the invert 9 is configured as a water conduit for smoothing the flow of water.

Further, the bottom plate 4 is provided with three mounting holes 10 penetrating from the upper surface 4a to the lower surface 4c, and these mounting holes 10 are equidistant from the central portion C in the radial direction and at the periphery. They are arranged at equal intervals along the direction. A height adjusting device 11 for inclining the bottom slab 4 toward the outflow port 8 side of the manhole body 3 is attached to each attachment hole 10. As shown in FIG. 6, the height adjusting device 11 includes an embedded nut 12 which is embedded in the lower portion of the bottom plate 4 corresponding to the mounting hole 10 and a height adjusting bolt 13 which is screwed into the embedded nut 12. An anchor 14 for preventing rotation and removal is fixed to the upper part of the embedded nut 12.
Further, the height adjusting bolt 13 is formed longer than the plate thickness of the bottom plate 4, and when the height of the bottom plate 4 is adjusted, the tip portion 1
3a projects from the lower surface 4c of the bottom slab 4 and comes into contact with the upper surface of the bottom concrete 2.

Further, the bottom plate 4 is provided with two injection holes 15 penetrating from the upper surface 4a to the lower surface 4b, and these injection holes 15 are spaced from the central portion C at equal distances in the radial direction. It is arranged opposite. Then, the bottom plate 4 is provided with a grout (mortar), which is a filling and bonding material, in the injection hole 1.
Fixed from the inner peripheral wall of the manhole main body 3 and the outer peripheral surface 4b of the bottom slab 4 and between the upper surface of the bottom concrete 2 and the lower surface 4c of the bottom slab 4 by pouring from above. It is supposed to be done. It should be noted that the outer peripheral surface 4b of the bottom plate 4 is provided with a notched portion 16 formed by chamfering the upper and lower corners over the entire circumference. The outer peripheral surface 4b is configured so as not to collide with the inner peripheral wall of the manhole body 3.

To construct the prefabricated manhole 1 of this embodiment, first, the manhole body 3 is built on the bottom concrete 2. Next, the bottom slab 4 is hung from the upper opening of the manhole body 3 to the bottom and placed on the top surface of the bottom concrete 2, and the bottom slab 4 is moved in the circumferential direction so that the opening 9a of the invert 9 matches the outflow port 8. Then, while tightening the adjusting bolt 13 of the height adjusting device 11 in the mounting hole 10 located on the side opposite to the invert 9, the adjusting bolts 13 of the height adjusting devices 11 in the other mounting holes 10 are respectively tightened, or The bottom plate 4 is adjusted so as to be inclined toward the outflow port 8 side of the manhole body 3 by loosening it.

In this state, the grout is filled with the injection hole 1 of the bottom plate 4.
5, and the grout is injected between the upper surface of the bottom concrete 2 and the lower surface 4c of the bottom plate 4, and the manhole body 3
It is filled so that it may spread between the inner peripheral wall of and the outer peripheral surface 4b of the bottom plate 4. Then, when the grout hardens, the bottom slab 4 is fixedly installed on the bottom of the manhole body 3 in a state in which water can flow in and out (see FIG. 1). After that, if other constituent members (not shown) are installed, the assembling work of the assembling manhole 1 is completed.

In such a prefabricated manhole 1, regardless of the position of the inflow pipe 5, all the water flowing from the inflow pipe 5 into the manhole body 3 through the inflow port 7 is the upper surface 4a of the bottom plate 4. Collected at the central portion C of the invert 9 and flows into the invert 9, flows inside the invert 9, is naturally guided to the opening 9a side, and is surely discharged to the outflow pipe 7 through the outflow port 8.

That is, in this embodiment, the adjusting bolt 13 of each height adjusting device 11 is operated to adjust the inclination of the bottom slab 4, and grout is injected from the injection hole 15 to fix the bottom slab 4 to the manhole main body. Since it is installed at the bottom of No. 3, it requires no special technology and can be installed by simple on-site work. Moreover, since the invert 9 provided on the upper surface 4a of the bottom plate 4 does not need to be formed in various types of shapes corresponding to the topography of the site as in the conventional case, the bottom plate 4
Requires less formwork to manufacture.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, the bottom slab 4 having the grout injection hole 15 is used, but the grout is injected from between the inner peripheral wall of the manhole body 3 and the outer peripheral surface 4b of the bottom slab 4. If possible, the bottom plate 4 without the injection hole 15 may be used. Further, as the height adjusting device 11,
It is also possible to use a member other than the embedded nut 12 and the height adjusting bolt 13 for the configuration.

[0020]

As described above, in the assembly type manhole according to the present invention, the upper surface of the bottom slab used for constructing the manhole is formed into a curved surface having a low central portion, and the outer peripheral surface is formed on the upper surface of the bottom slab from the central portion. With an invert extending toward the manhole, which is arranged corresponding to the outlet of the manhole,
The bottom slab is provided with a height adjusting device that inclines it toward the outflow side of the manhole, and the bottom slab is fixed to the bottom of the manhole by adjusting and fixing the tilt of the bottom slab with the height adjusting device. Since it has been installed, it is possible to easily perform work on the slab even in a manhole in a narrow space without requiring special technology, and it is possible to improve the efficiency of on-site work. Moreover, the water flowing into the manhole is
Irrespective of the position of the inflow pipe, the water is naturally guided to the outflow port through the upper surface of the slab and the invert, so that water can be quickly and completely discharged. Further, in the prefabricated manhole of the present invention, since it is not necessary to form the shape of the invert provided on the upper surface of the bottom slab according to the topography of the site, the type of formwork for manufacturing the bottom slab is greatly reduced, and the manufacturing cost is reduced. Can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view conceptually showing an assembled manhole according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a bottom slab used for constructing the prefabricated manhole.

FIG. 3 is a plan view showing the bottom plate.

4 is a cross-sectional view taken along the line AA in FIG.

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

FIG. 6 is a cross-sectional view showing a bottom plate provided with a height adjusting device.

FIG. 7 is a cross-sectional view showing a conventional assembly type manhole provided with an invert.

FIG. 8 is a plan view conceptually showing the relationship between the invert and the inflow pipe / outflow pipe.

FIG. 9 is a cross-sectional view showing an assembly type manhole provided with another conventional invert.

[Explanation of symbols]

 1 Assembly type manhole 2 Bottom concrete 3 Manhole body 4 Bottom plate 4a Bottom plate top surface 5 Inflow pipe 6 Outflow pipe 7 Inlet port 8 Outlet port 9 Invert 10 Mounting hole 11 Height adjustment device C Bottom plate central part

Claims (1)

[Claims] 1. A bottom slab used for constructing a manhole is formed with a curved surface having a low central portion, and the upper surface of the slab extends from the central portion toward an outer peripheral surface and corresponds to an outlet of the manhole. By providing an invert that is arranged in a manner such that the bottom slab is provided with a height adjusting device that inclines it toward the outflow side of the manhole, and by adjusting the inclination of the bottom slab with the height adjusting device and fixing it. An assembling type manhole, wherein the bottom slab is installed at the bottom of the manhole.