JP3075833B2 - Method of manufacturing manhole invert for sewage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an invert for a manhole for sewage constructed under a road, and more particularly to a method for manufacturing an invert capable of easily forming the invert outside the manhole.

[0002]

2. Description of the Related Art Conventionally, a manhole 1 for sewage as shown in FIG. 9 is well known.
A concrete base plate 3 is set on a solidified foundation, and a concrete body 4 is constructed on the bottom plate 3 in order from the bottom, and an iron cover 5 is covered at an entrance. Then, an inflow pipe 6 and an outflow pipe 7 are connected to the lower part of the manhole 1, and a gutter-shaped drain groove 8B shown in FIG. Invert 8 with 8B-8C
A is formed. The molding of the invert 8A is performed manually by a skilled worker. Further, it is desired that the sewage does not collect at the bottom of the manhole 1 when the sewage is not flowing in the manhole 1.

[0003]

As described above, the forming of the invert 8A is a difficult operation since it is performed manually in a narrow place at the bottom of the manhole 1 and requires not only a special technique by a skilled worker but also the construction of the manhole. A large amount of concrete is required at the site, and it takes a lot of time for the construction and solidification of the concrete. In addition, the sewage tends to collect at the bottom of the manhole 1 in a state where the sewage is not flowing.
There were various problems. The present invention has been made to solve the above problems.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an inflow pipe 6 at a lower portion of a sewage manhole 1.
In the invert 8 of the sewage manhole 1 in which a gutter-shaped drain groove is formed in the flow path from the inflow pipe 6 to the outflow pipe 7 in the manhole 1, the invert 8 A cylindrical female mold 9, a female mold insertion portion 10 a fitted into the female mold 9 and having an outer diameter D substantially equal to the inner diameter of the female mold 9, and a circular flat surface 1 having a diameter d.
0b, outer peripheral upper end edge of female fitting portion 10a and circular flat surface 10b
Inclined surface 10 formed with a height H between the outer peripheral edge of
c, and a gutter shape having a diameter substantially equal to the diameter of the inflow pipe 6 or the outflow pipe 7 that is movable in the circumferential direction along the inclined surface 10 c of the main male mold 10. It is characterized in that concrete is poured into a mold frame 12 formed by a main male mold 10 composed of a plurality of sub male molds 11 and molded.

[0005]

According to the above-mentioned method, the method for producing a sewer manhole invert according to the present invention comprises the steps of:
A drain groove 8c suitable for the pipe diameters of the inflow pipe 6 and the outflow pipe 7 can be formed easily and easily in advance at a place other than the construction site, and the drain groove 8c in which drainage is performed well. , And fixing the completed invert 8 to the bottom of the manhole 1 under construction. Therefore, the skill is not required for the construction, the work is completed in a short time, and since the invert 8 is constructed in a solidified state, the construction time of the entire manhole is greatly reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. In FIG. 9, the sewage manhole 1 digs a construction hole below the road 2 in the same manner as the above-mentioned conventional one, and a concrete slab 3 is installed on a solid foundation at the bottom where the manhole is installed. This bottom version 3
On the upper part, the driving body 4 made of concrete is piled up in order from the bottom and constructed, and the entrance part is covered with an iron lid 5. An inflow pipe 6 and an outflow pipe 7 are connected to the generator 4 at the lower part of the manhole 1 by performing a water leakage treatment. The flow path of the sewage from the inflow pipe 6 to the outflow pipe 7 in the manhole 1 includes, as shown in FIGS.
The invert 8 made of concrete is fixed by the filler 13 during the construction process of the manhole 1.

The invert 8 is shown in FIGS. 1, 2 and 5
Is pre-manufactured (precast) at a place other than the manhole construction site by the formwork 12 shown in FIG. The mold frame 12 is fitted in the female mold 9 having a cylindrical shape, and is movable in the circumferential direction along a main male mold 10 having a truncated cone shape and an inclined surface 10c of the main male mold 10. , A plurality of (minimum two) secondary male molds 1 each having a gutter shape having a diameter substantially equal to the diameter of the inflow pipe 6 or the outflow pipe 7.
Consists of one. The diameter and arrangement angle of the secondary male mold 11 corresponding to the inflow pipe 6 or the outflow pipe 7 can be freely selected. In this embodiment, three or four sub male molds 11 are provided on the inclined surface 10c of the main male mold 10. You can do it.

The main male mold 10 has a female fitting portion 10a having an outer diameter D substantially equal to the inner diameter of the female mold 9, a circular flat surface 10b having a diameter of d, and an outer periphery of the female fitting portion 10a. It is made of metal and has an inclined surface 10c formed with a height H between the upper end edge and the outer peripheral edge of the circular flat surface 10b. The diameter d of the circular flat surface 10b and the height H of the inclined surface 10c
May be changed as appropriate. In addition, the vice male type 11
The diameter C of the drainage groove forming portion 11a is slightly smaller than the diameter d of the circular flat surface 10b, and the height of the outer peripheral portion is reduced or increased as shown by imaginary lines 11b and 11c in FIG. Is also good. Then, concrete is poured into the mold 12 formed by the female mold 9, the main male mold 10 and the sub male mold 11 to form the invert 8.

The invert 8 is formed to have an outer diameter slightly smaller than the inner diameter of the bottom of the manhole 1 to be built, and is fixed by the filler 13 during the construction of the manhole 1 as described above. It is desirable that the concrete to be used is of a pre-setting type. The reason is that, when the manhole 1 is constructed, if its diameter, height, the diameter of the inflow pipe 6 and the outflow pipe 7 and the connection angle to the manhole 1 are determined, the concrete pipe used for the vehicle body 4
A pre-manufactured one is selected and used, and holes corresponding to the inflow pipe 6 and the outflow pipe 7 are formed in this, and the inflow pipe 6 is formed.
This is because it is desirable that the invert 8 is completed within the construction time until the outflow pipe 7 is connected. The invert 8 has a sewage inflow groove 8a and a circular diversion section 8b.
, A sewage drain groove 8c, and an inclined surface 8d.

Next, the manhole construction work according to the present invention will be described. First, when the diameter and height of the manhole 1 to be constructed, the diameter and number of the inflow pipes 6 and the outflow pipes 7 to be connected, the connection angle to the manhole 1, and the like are determined, the road 2
A work hole is excavated below the slab, the foundation at the bottom where the manhole is installed is solidified, and a bottom slab 3 made of concrete is installed thereon. An annular 4 concrete body 4 made of concrete fixed on the bottom slab 3 has a shape corresponding to the diameter of the inflow pipe 6 and the outflow pipe 7 and the connection angle to the manhole 1 at a place other than the manhole construction site. Cut the connection hole. Then, the inflow pipe 6 and the outflow pipe 7 are connected to the connection holes, and waterproofing of the connection portion is performed.

On the other hand, when the diameter and height of the manhole 1, the diameters of the inflow pipe 6 and the outflow pipe 7 to be connected, the connection angle to the manhole 1, and the like are determined, a mold 12 suitable for these is prepared. That is, a plurality of female molds 9 each having a diameter slightly smaller than the diameter of the manhole 1, and a drainage groove forming portion 11 a having a diameter corresponding to the main male mold 10 and the inflow pipe 6 or the outflow pipe 7 inserted into the female mold 9. Is selected and prepared.
Then, the plurality of sub male molds 11 are inclined to the inclined surface 10c of the main male mold 10.
The concrete (mortar) compounded in the early curing type is poured into the female mold 9 in accordance with the connection angle of the inflow pipe 6 and the outflow pipe 7 to the manhole 1 and is solidified. When the solidified concrete is taken out from the mold 12, an invert 8 is obtained.

The invert 8 has a sewage inflow groove 8a formed in the invert 8 at the opening of the inflow pipe 6 and a sewage discharge groove 8c when the inflow pipe 6 and the outflow pipe 7 are connected to the vehicle body 4. Are fitted to the bottom of the power generating body 4 with the filler 13 in a state of being matched with the opening of the outflow pipe 7, the sewage inflow groove 8 a is provided in the opening of the inflow pipe 6, and the sewage discharge groove 8 c is provided in the outflow pipe 7. Each is connected to the opening. Then, the vehicle bodies 4 are sequentially stacked upward, and the entrance portion opened to the road 2 from the inclined portion is covered with the iron cover 5 to complete the manhole 1. The sewage inflow groove 8a and the sewage discharge groove 8c formed in the invert 8 are two as shown in FIG. 7 or three as shown in FIG.
Alternatively, in some cases, the mold 12 of the present invention can be formed arbitrarily.

As described above, in the present invention, the sewage inflow groove 8a and the sewage discharge groove 8c corresponding to the pipe diameters of the inflow pipe 6 and the outflow pipe 7 are previously formed in a place other than the construction site of the manhole 1 in the present invention. It can be simply and easily formed and manufactured. Then, the completed invert 8 can be constructed simply by fixing it with the filler 13 to the bottom of the manhole 1 under construction. Therefore, the work can be completed in a short time without requiring any skill in the construction. Further, since the invert 8 is constructed in a solidified state, the construction time of the entire manhole 1 is greatly reduced. Moreover, in a state where the sewage is not flowing into the manhole 1, the circular water diversion part 8b
At the boundary, the sewage flows into the inflow pipe 6 and the outflow pipe 7, and the sewage does not accumulate at the bottom of the manhole 1, which is sanitary.

[0014]

As described above, according to the method for producing a sewer manhole invert according to the present invention, the invert 8
Is a female mold 9 having a cylindrical shape, and a female fitting portion 10 fitted into the female mold 9 and having an outer diameter D substantially equal to the inner diameter of the female mold 9.
a, a circular flat surface 10b having a diameter of diameter d, female-type insertion portion 1
0a and an outer peripheral edge of a circular flat surface 10b, the main male die 10 having a truncated cone shape having an inclined surface 10c having a height H, and an inclined surface 10c of the main male die 10 And a main male mold 10 comprising a plurality of sub-males 11 having a gutter shape having a diameter substantially equal to the diameter of the inflow pipe 6 or the outflow pipe 7. Since the concrete is poured and molded, the invert 8 is formed simply and easily in advance at a place other than the construction site of the manhole 1 with a drain groove 8c corresponding to the pipe diameter of the inflow pipe 6 and the outflow pipe 7. Can be manufactured. Moreover, the drain can be constructed simply by forming the drain groove 8c in which the drain is favorably performed, and fixing the completed invert 8 to the bottom of the manhole 1 under construction. Accordingly, the skill is not required for the construction, the work is completed in a short time, and the invert 8 is constructed in a solidified state, so that the construction time of the entire manhole 1 can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view of an invert manufacturing formwork according to the present invention.

FIG. 2 is an arrow view from a direction A in FIG. 1;

FIG. 3 is a perspective view of an invert formed by a mold.

FIG. 4 is an arrow view from a direction B in FIG. 3;

FIG. 5 is a perspective view of the entire form from below.

FIG. 6 is a perspective view from above of an invert formed by a mold.

FIG. 7 is a cross-sectional view of an inverted portion of a manhole.

FIG. 8 is a cross-sectional view of another embodiment of the inverted portion of the manhole.

FIG. 9 is a longitudinal sectional view of a manhole.

FIG. 10 is a perspective view of a conventional manual invert.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Manhole for sewage 2 Road 3 Bottom plate 4 Generator 5 Iron lid 6 Inflow pipe 7 Outflow pipe 8 Invert 8a Sewage inflow groove 8b Circular diversion part 8c Sewage drainage groove 9 Female type 10 Main male type 10a Female type fitting part 10b Round Plane 10c Inclined surface 11 Secondary male type 11a Drainage groove forming part 11b, 11c
Vice male type with different height 12 Formwork 13 Filler

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-210311 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 29/12 E03F 5/02 B28B 7 / 00-7/46

Claims (1)

(57) [Claims] 1. An inflow pipe (6) and an outflow pipe (7) are connected to a lower part of a sewage manhole (1) , and the manhole (1) is connected.
In an invert (8) of a sewage manhole (1) in which a gutter-like drain is formed in a flow path from an inflow pipe (6) to an outflow pipe (7) in the inside, the invert (8) a cylindrical female (9), the female (9) and the fitting inserted within, substantially equal to the inner diameter of the female (9)
Female fitting insertion part (10a) having a large outer diameter (D), diameter
(D) Circular flat surface (10b) having a diameter, female-type insertion portion
(10a) outer peripheral top edge and circular plane (10b) outer peripheral edge
And a slope (10) formed with a height (H) between
c) a frustum-shaped main male mold (10), and the main male mold
(10) a of the movable circumferentially along the inclined surface (10c), from the inflow pipe (6) or outlet pipe (7) a plurality of sub-male with a diameter almost equal trough shape and size (11) The main male type
(10) A method for producing an invert for manholes for sewage, wherein concrete is poured into a mold (12) formed by the method and molded.