JPH06248657A - Invert inlet, and construction therefor - Google Patents

Abstract

PURPOSE:To improve the accuracy in installation of an invert inlet, and save the time and labor in execution of works at site. CONSTITUTION:Pipe-laying ditches G1-G3 are dug to the ground along positions for laying drainpipes 5, and a pit G4 is excavated in a position where the drainpipes intersect and a foundation 6 is constructed in the pit 4. An external case 1 is laid on the foundation 6 and an invert member 2 is fitted into the external case 1. Ends 23a-23c of a merging groove 23 formed to the upper face of the invert member are connected to the lower edges of connecting notches 14-16 provided to side walls 11-13 of the external case 1. Then, ends of drainpipes 5 laid in the pipe-laying ditches G1-G3 are connected to the connecting notches 14-16, and the surroundings of the external case 1 is refilled with excavated earth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor sewage drainage facility, which is an invert sluice which is interposed at a meeting point of an underground drainage pipe, and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, in the construction of an invert stake installed at the confluence of a wastewater drainage pipe installed underground, a worker such as a plasterer has traditionally worked on this concrete stake after burying the concrete stake has been completed. The bottom of the basin is constructed by filling the interior with mortar and finishing with a trowel.
The bottom of the invert basin has a groove-like sewage flow path that connects the ends of the drainage pipe connected to the side wall of the basin, and a required gradient is set from the upstream side to the downstream side.

[0003]

However, according to the conventional method, the bottom of the invert stile is constructed by mortaring the mortar after the burying of the concrete sill is completed. Since the work is forced, it takes a lot of time to work in such a posture, and the construction accuracy such as the gradient of the sewage flow passage is affected by the skill and intuition of the operator.

The present invention has been made under the circumstances as described above, and its technical problem is to improve the construction accuracy and to save labor in the construction site.

[0005]

The above-mentioned technical problems are as follows.
The present invention can effectively solve the problem. That is, the invert box according to the present invention is capable of being fitted to an outer cylinder having a plurality of connection notches connected to the end portion of the drainage pipe formed in different directions on the side wall and an inner side surface of the side wall of the outer cylinder. And an invert member having a confluence groove extending between positions corresponding to the respective connection notches on the upper surface.
On the lower surface of the invert member, in a preferred embodiment,
Anchor legs are formed to support the ends of the confluence groove at positions facing the connection notches. In addition, the construction method of the invert basin according to the present invention, the groove for piping and the root cutting portion of the intersection position are excavated on the ground along the laid location of the drainage pipe, and the foundation is constructed on the root cutting portion, An outer cylinder is installed on the upper cylinder, and each end of the confluent groove formed on the upper surface of the outer cylinder is fitted into the outer cylinder to join the lower edge of the connection cutout formed on the side wall of the outer cylinder and The end of the drainage pipe laid in the groove for piping is connected to the connection notch, and the excavated soil is backfilled around the outer cylinder.

[0006]

The invert member has a confluent groove on its upper surface that serves as a sewage flow path that connects between the ends of the drainage pipe connected to the connection cutout on the side wall of the outer cylinder. It is fitted into the outer cylinder during the construction of the invert basin. A space between the end of the confluence groove and the connection notch can be completely joined by filling with mortar or the like. The invert member is accurately positioned by fitting the anchor leg of the lower surface thereof onto the foundation, and is firmly fixed by being embedded in the mortar laid on the foundation. The present invention will be described below with reference to a preferred embodiment shown in the drawings.

[0007]

1 is a partially broken exploded perspective view showing a preferred embodiment of an invert sash according to the present invention, and FIG. 2 is a sectional view showing a completed state of the invert stile. In the figure, reference numeral 1 is an outer cylinder made of precast concrete in the shape of a rectangular tube, 2 is an invert member made of a plastic building material such as FRP resin and fitted in the lower part of the outer cylinder 1, and 3 is the outer cylinder 1.
A concrete lid made of precast concrete to be sealed at the upper end of the 4 is a circular opening 3 of the concrete lid 3.
It is a manhole cover made of cast iron that is detachably attached to 1.

U-shaped connecting notches 14 to 16 are formed in the lower portions of the three side walls 11 to 13 of the outer cylinder 1 for fitting and joining the ends of the wastewater drainage pipe 5, respectively.
The upper end arcuate portion of the connection notch 14 is slightly higher than the upper end arcuate portion of the connection notch 16 facing it, and the upper end arcuate portion of the connection notch 15 corresponds to the upper end arcuate portions of the connection notches 14 and 16. It is at the height on the straight line that is tied, that is, the connection notch 1
The height of the upper end is gradually decreased in the order of 4 to 16. A flange portion 17 is formed on the upper end of the outer cylinder 1 so as to extend outward in a stepped manner, and the concrete lid 3 is fitted and held on a stepped surface 17a in the flange portion 17.

As shown in FIG. 3, the invert member 2 is composed of a flat main body 21 and a frame-shaped anchor leg portion 22 integrally formed on the lower surface thereof. The main body 21 has a substantially square planar shape, and is die-molded with a standard dimension of 450 mm, 600 mm, or 800 mm on one side, for example, according to the inner method of the inner surface of the outer cylinder 1. A three-way junction groove 23 is formed on the upper surface of the invert member 2, and each end 23a, 23b, 23c thereof reaches the edge of the main body 21 in correspondence with the connection notches 14 to 16 of the outer cylinder 1, respectively. ing. Of these, the mainstream portion 23d that extends straight between the end portions 23a and 23c has a tilt angle of a straight line connecting the centers of the upper end arcuate portions of the connection notches 14 and 16 with respect to the lower end surface of the anchor leg portion 22. The inclination angles are substantially equal to each other, and the tributary portion 23e that joins the mainstream portion 23d from the end portion 23b is inclined so that the mainstream portion 23d side becomes lower. The height of the anchor leg portion 22 is such that the end portions 23a, 23b, 23 of the merging groove 23 are in the completed state shown in FIG.
c is set so as to be positioned at a position facing the drainage pipe 5 connected to the upper-end arcuate portion of each of the connection notches 14 to 16.

In the sewage piping work, in order to bury the above-mentioned invert basin in the ground, first, the pipe grooves G1 to G3 are excavated along the laying place of the drain pipe 5, and at the crossing position, a particularly large root cutting is performed. The portion G4 is excavated, and the foundation 6 composed of the split stone 61 and the concrete 62 cast thereon is constructed on the bottom surface of the root cutting portion G4. When the basic concrete 62 is hardened, the outer cylinder 1 is positioned and installed on the outer cylinder 1 such that the connection notches 14 to 16 face the extension direction of the pipe grooves G1 to G3, and an appropriate amount of the mortar paste 7 is placed in the outer cylinder 1. (See FIG. 2).

Next, the invert member 2 is fitted into the outer cylinder 1. At the time of fitting, each end 23a of the confluent groove 23
˜23c is set right above the connecting notches 14 to 16 of the outer cylinder 1, and the body 21 of the invert member 2 is inserted into the outer cylinder 1 and the anchor leg 22 at the lower end is inserted into the outer cylinder. 1
It is buried in the mortar paste 7 filled inside and pushed into until it contacts the upper surface of the basic concrete 62. As a result, the four edges of the main body 21 of the invert member 2 are opposed to the inner surface of the lower portion of the outer cylinder 1 in close contact with each other or with a slight gap therebetween, and the ends 23a to 23c of the confluence groove 23 are connected to the outer cylinder 1. Is positioned near the upper portion of each of the connection notches 14 to 16. When there is a gap between the main body 21 of the invert member 2 and the inner side surface of the outer cylinder 1, especially in the joint portion of the end portions 23a to 23c, it is possible to complete the joint state by filling with mortar or the like. .

The merging groove 23 of the invert member 2 serves as a sewage flow path connecting the ends of the drain pipe 5, and since it is formed during the production by die molding, The formation of the sewage flow path is completed by a simple operation of fitting the member 2 into the outer cylinder 1. Therefore, it is not necessary for a skilled worker to perform the work of forming the sewage channel by the mortar ironing work of the mortar, and the construction accuracy such as the gradient of the sewage channel can be made uniform and highly accurate.

Next, the end portions of the sewage drainage pipe 5 laid in the pipe grooves G1 to G3 on the ground G are connected to the connecting notches 14 of the outer cylinder 1.
While being fitted into the upper end arcuate portion of ~ 16, the periphery thereof is filled with mortar 8 to join them. Also, the outer cylinder 1
The concrete lid 3 is fitted into the step surface 17a in the flange portion 17 at the upper end of, and the mortar 9 is filled into the fitting gap and sealed. Further, the excavated soil at the time of excavating the root cutting part G4 is backfilled around the outer cylinder 1, and similarly, the pipe grooves G1 to G
By filling the excavated soil in 3 as well, the underground pipe construction of the drainage pipe 5 and the construction of the invert basin are completed.

The present invention is not limited to the illustrated embodiment. For example, the outer cylinder 1 can be applied to other shapes such as a cylindrical shape other than the illustrated rectangular cylinder, and the plurality of kinds of outer cylinders 1 having different numbers, sizes and opening directions of the connection cutouts can be used. If a plurality of types of invert members 2 having different shapes of the merging groove 23 are prepared correspondingly, it is possible to deal with any pipe merging portion.

[0015]

According to the present invention, in the construction of an invert stub on site, the side wall of the outer cylinder can be carried out simply by fitting the invert member having the predetermined confluence groove formed on the upper surface into the outer cylinder. Since the construction of the wastewater flow path that connects the ends of the drainage pipe connected to the connection cutout is completed, it is not necessary for a skilled worker to perform the work of forming the wastewater flow path by the mortar ironing work of the mortar. Also, the construction accuracy such as the gradient of the sewage flow path is made uniform and highly precise, and the construction has an excellent effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway exploded perspective view showing a preferred embodiment of an invert box according to the present invention.

FIG. 2 is a cross-sectional view showing a completed construction state of the invert stile of the above embodiment.

FIG. 3 is an explanatory view showing the shape of an invert member in the above embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 11-13 Side wall 14-16 Connection notch 2 Invert member 22 Anchor leg 23 Confluence groove 23a-23c End part 5 Drain pipe 6 Foundation G1-G3 Piping groove G4 Root cutting part

Claims (3)

[Claims] 1. An outer cylinder having a plurality of connection cutouts, which are connected to the end of the drainage pipe, formed on the side wall in different directions, and an upper surface of the outer cylinder that can be fitted to the inner side surface of the side wall of the outer cylinder. And an invert member having a confluent groove extending between positions corresponding to the respective connection cutouts. 2. The invert rod according to claim 1, wherein an anchor leg portion is formed on a lower surface of the invert member to support each end portion of the merging groove at a position facing each connecting notch. 3. A step of excavating a groove for piping and a root cutting portion at an intersection thereof in the ground along a place where a drainage pipe is laid, a step of constructing a foundation on the root cutting portion, and an outer cylinder on the foundation. Installing the invert member into the outer cylinder, and joining each end of the confluence groove formed on the upper surface of the outer cylinder to the lower edge of the connection cutout formed in the side wall of the outer cylinder and The invert rod according to claim 1 or 2, comprising a step of connecting an end of a drainage pipe laid in a groove to the connection cutout, and a step of backfilling excavated soil around the outer cylinder. Construction method.