JPH05255945A - Omnidirectional invert and forming method for its conduit - Google Patents

Abstract

PURPOSE:To provide the invert block of a manhole capable of being manufactured by one kind of a formwork, allowing the correct and precise machining of a conduit, and having excellent workability, adjustability, and transportability separately from a side wall. CONSTITUTION:An invert 1 is provided with a conical recess 2 on the upper face, a water guide groove 3 is provided in one radial direction, and the side face of the invert 1 is formed into a cylindrical shape. Another water guide groove 5 can be post-machined by cutting from the side face. The angle between the center axis of the water guide groove 3 of the invert 1 and the center axis of a rotary bit is matched with the crossing angle of the inflow/outflow pipe axes at the site, and the water guide groove 5 is cut-machined at a conical wall section from the side face of the invert 1 with the rotary bit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an invert used at the bottom of a sewage manhole and a method of forming a water conduit on its upper surface.

[0002]

2. Description of the Related Art Recently, manholes for sewage are
On-site pre-cast products are used from the viewpoint of construction period and labor saving. For the sewage manhole, an invert having a groove connecting the introduction pipe and the discharge pipe at the bottom thereof is used. This invert is either integrated with the side wall of the manhole or separate. A separate body is preferable because the installation height and direction can be easily adjusted, and the handling weight can be selected as an appropriate weight.

By the way, the direction of the sewer pipe connected to the sewer manhole is different depending on the manhole installation position. For this reason, the groove on the upper surface of the invert, which is aligned with the direction of the water conduit, is shaped and constructed by a mortar engineer with special skills at each site. However, due to the shortage of human resources in mortar work, the progress of construction work has been hindered. In consideration of such a situation, Japanese Patent Publication No. 31176/1990 discloses an invert block manufactured in a factory. However, as mentioned above, since the inflow pipe angle to the manhole is wide, it is not possible to manufacture and supply inverts with various inflow and outflow pipe mounting directions with precast products.
It requires a myriad of forms, which is impossible at the outset.

In another prior art, as shown in FIG. 3, a water inlet 13 is provided only in one direction of the invert which is integrated with the lower side wall 11 of the manhole 10, and a circle other than this water inlet 13 is provided. A precast manhole lower member 1 having a so-called weakening wall 14 in which a curved surface 12 is provided on the inner wall and a horizontal band-shaped recess 15 is formed on the outer periphery in the peripheral portion.
1 is manufactured, and the concrete of this weakening wall portion is punched out manually to open the other water guide port 16 in a desired direction. Such an invert block has an advantage that a precast product can be manufactured by using only one type of mold, and another water guide port 16 can be provided in any direction on the circumference. However, since the concrete wall is punched out manually, it is not easy to form a water guide port with a specified shape, and it is not easy to form a hole for the water pipe. The labor-intensive problem is still unsolved.

[0005]

SUMMARY OF THE INVENTION The present invention solves such a problem and can be manufactured with one mold having a simple shape, and it is possible to accurately and precisely process a water conduit by cutting. It is an object of the present invention to provide an invert block that is separate from the side wall and that has excellent features such as workability, ease of adjustment, and ease of transportation. The present invention also provides such a method of forming a water conduit for an invert block.

[0006]

According to the present invention, a recessed portion having a center-axis-symmetrical mortar shape and one water-conducting groove having a U-shaped cross section along a radius are provided on the upper surface, and the side surface is fitted to the inner surface of a manhole. The omnidirectional invert is characterized in that it is formed in a shape, and another water guiding groove is formed by cutting from this side surface so that it can be post-processed.

This invert is an omnidirectional type, and in order to process other introductory grooves in this invert, the angle between the central axis of the existing water guide groove and the central axis of the rotary bit is derived from the local introductory tube axis. Match the angle of intersection with the pipe axis, and cut another water guide groove on the mortar wall from the outer diameter side of the invert with a rotating bit. With such a water conduit forming method, the omnidirectional invert of the present invention can process an accurate and accurate water conduit.

[0008]

According to the invert of the present invention, a center-axis-symmetrical conical recess is formed on the upper surface, and one radial water guiding groove having a U-shaped cross section is provided in one wall of the conical recess. is there. In addition, the invert has a shape in which the side surface is fitted to the inner surface of the manhole, is attached to the side wall of the manhole, and is an invert separate from the side wall. The shape of the manhole is usually cylindrical, but there are oval, oval, and others. If the outer shape is significantly different from the central axis symmetric shape, the mortar-shaped recess can be freely deformed into a shape that is not central axis symmetric. This invert allows post-processing of other water guide grooves at any position by cutting from the side surface. This invert can be produced by one formwork. When another water guide groove is formed in this invert, it is performed using a cutting machine in a factory. Align the angle between the center axis of the water guide groove of the invert and the center axis of the rotating bit with the intersection angle of the local inflow and outflow pipe axes and place it on the table of the cutting machine.From the side of the invert, use the rotating bit to form the water guide groove on the mortar wall. Cutting process.

Since the invert of the present invention is separate from the side wall of the manhole, it is easy to adjust the height difference at the time of installation, align the direction, etc., and is highly workable. In addition, the water conduit for introduction and derivation can be constructed reliably and accurately at any central angle, and human labor can be minimized.

[0010]

1 is a perspective view of an embodiment of the present invention. The invert 1 of the embodiment has a cylindrical side surface, a mortar-shaped recess 2 concentric with the outer diameter is provided on the upper surface, and a water guiding groove 3 is provided in one of the radial directions. That is, a concentric mortar-shaped recess 2 and a single radial water guide groove 3 are provided on the upper surface. As shown by an imaginary line in FIG. 1, it is possible to post-process another water guide groove 5 by cutting from the side surface. The insert 4 shown in the figure is for lifting this invert. The machining of this Invert's headrace was performed by matching the angle between the central axis of the Invert's headway and the central axis of the rotary bit with the intersection angle of the local inflow and outflow pipe axes, and from the side of the Invert to the mortar wall by the rotary bit. Cut the water guide groove. Such processing can be performed by using a concrete product piercing apparatus provided by the present inventor in Japanese Patent Publication No. 2-32124.

FIG. 2 is a plan view of the embodiment of FIG.
It is a side view and (c) sectional view. The invert 1 of the embodiment is placed on the turntable of the above-mentioned concrete product hole punching device, and the intersection angle θ between the central axis 6 of the water guiding groove 3 and the central axis 7 of the rotary bit is matched with the intersection angle of the inflow / outflow pipe at the site and turned. The table is fixed, and the water guide groove 5 is cut from the direction shown by the arrow 8 by a rotary bit.

[0012]

According to the present invention, the manhole invert is produced by one type of formwork, and the headrace channel of an accurate position and shape is machined by machining according to the actual situation of the site,
Can be installed accurately on site. Therefore, the accuracy is high, and the work can be performed quickly and reliably by a simple operation such as pouring mortar into the gap between the manhole and the side wall.

[Brief description of drawings]

FIG. 1 is a perspective view of an invert according to an embodiment.

FIG. 2 is a three-view drawing of an example invert.

FIG. 3 is an explanatory diagram of a conventional invert.

[Explanation of symbols]

 1 invert 2 mortar-shaped recess 3 water guiding groove 4 insert 5 other water guiding groove 6 water guiding groove axis 7 rotary bit axis 8 arrow 10 manhole 11 lower side wall 12 curved surface 13 water guiding port 14 weakening wall 15 recessed portion 16 other water guiding port

Claims (2)

[Claims] 1. A center-axis-symmetrical mortar-shaped recess and a single water-conducting groove having a U-shaped cross section along the radius are formed in the upper surface, and the side surface is formed into a shape that fits inside the manhole. An omnidirectional invert, characterized in that another water guide groove was formed by cutting so that it could be post-processed. 2. The angle between the central axis of the water guide groove of the invert according to claim 1 and the central axis of the rotary bit is matched with the intersection angle of the local inflow and outflow pipe axes, and the mortar wall portion is provided from the side surface of the invert by the rotary bit. A method for forming an omnidirectional inversion water conduit, characterized in that another water conduit is cut on the surface.