JPH0231176B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention provides a method for installing sewage pipes on the bottom plate of manholes in sewage pipes, which was previously constructed by special workers such as plasterers each time construction was carried out. This relates to a standard invert block that is manufactured in advance at a factory to improve performance and shorten construction work.

(Prior Art) Conventionally, in the manholes of sewage pipes, flow guide grooves called inverts were formed in concrete at the bottoms of the manholes to ensure smooth flow and especially to prevent sewage from stagnation. This invert involves connecting the bottoms of the connecting pipe beams of the inflow and outflow pipes in a manhole and finishing them in a semicircular shape with mortar.
This finish is an important step in manhole installation, both in terms of appearance and functionality. Conventionally, this invert has been manually finished in narrow manholes by special workers such as plasterers, but this has had the problem of requiring more effort than planned and causing variations in the quality of the finished product.

(Problems to be Solved by the Invention) Therefore, the present invention attempts to solve the above-mentioned problems in the construction of inverts, and uses invert blocks that are standardized factory products to achieve uniform results and shorten the construction period. This is an attempt to shorten the time period.

(Means for Solving the Problems) An embodiment of the present invention will be described below based on the drawings. In the concrete disc-shaped invert block 1, the inlet pipe IF of the sewage manhole H and the A linear guide groove 2 with a semicircular cross section leading to the outflow pipe OF is formed, and the upper surface is formed into a slope 3 with a concave center, and the lower surface 4 is smooth.
Furthermore, four hanging holes 5 are drilled at approximately equal intervals on a concentric circle with the outer periphery, and concentric iron wires 6 that pass through these hanging holes 5 are buried, and nuts are inserted into the exposed parts of the hanging holes 5. 7 are welded to each other, and an adjustment bolt 8 is inserted and vertically installed therein. Note that in the drawing, S is a step inside the manhole.

(Operation or method of use) The invert block of the present invention configured as described above is as shown in FIG. Bottom plate P inside manhole H
Align the center marks of the invert block 1 and bottom plate P upwards and gently lower them to install. Then, use a crowbar to adjust the gap between the inner wall of the manhole H and the outside diameter of the invert block so that it is constant, and use the crowbar to make fine adjustments so that each pipe core and the opening center of the block are aligned.

Further, as shown in FIG. 5, the adjustment bolts 8 of each hanging hole 5 are turned with a spanner to adjust the level, and the vertical and horizontal slopes are checked to fix the invert block 1.

Next, as shown in Figure 6, fresh concrete is filled into the circumferential gap between the manhole H and the invert block 1 and into the hanging hole 5, and the surface is finished using a plastering trowel in the same manner as the block surface. do.

An invert block installed in this way allows for more sewage water to pass through than a hand-built one.

Note that, other than the embodiments, water guide grooves formed in a curved shape, Y-shape, or T-shape may also be fixed in the same manner to allow sewage to flow through.

(Effects of the Invention) The invert block of the present invention is a factory product with careful quality control, so there is no variation, the finish is clean, the installation is accurate with adjustment bolts, and the finishing work is easy. It can be constructed by ordinary workers rather than regular workers. Furthermore, unlike conventional on-site construction, there is no floating or peeling of the surface mortar, and even if there is a small leak, the construction can be completed and water can be passed immediately, so construction time can be shortened and construction costs can be reduced. This is a new and invented product that has many effects, including being able to be used for manholes.

[Brief explanation of drawings]

The drawings are explanatory diagrams of one embodiment of the present invention and the construction method, in which Fig. 1 is a plan view of a structure in which linear flow guide grooves are formed, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3. is a sectional view taken along the line B-B in Fig. 1, Fig. 4 is an explanatory cross-sectional view at the time of installation, Fig. 5 is an explanatory view with a partial cutout showing the level adjustment method, and Fig. 6 is a partial cutout showing the fixing method. FIG. 1... Invert block, 2... Guide groove, 3... Upper surface slope, 4... Lower surface, 5... Hanging hole, 6... Metal wire,
7... Nut, 8... Adjustment bolt, H... Manhole,
P...Bottom plate, S...Step, IF...Inflow pipe, OF...Outflow pipe, W...Hanging wire.

Claims (1)

[Claims] 1. In the concrete disc-shaped invert block 1, the central part of the top surface of the block 1 has a straight, curved, Y-shaped, T-shaped, etc. cross section leading to the inflow pipe IF and outflow pipe OF of the sewage manhole H. A semicircular flow guide groove 2 is formed, the upper surface is formed into a slope 3 with a concave shape, and the lower surface 4 is smooth, and three or four hanging holes 5 are provided at approximately equal intervals on a concentric circle with the outer periphery. These hanging holes 5 are drilled, and concentric metal wires 6 that pass through the hanging holes 5 are buried, nuts 7 are welded to the exposed parts of the hanging holes 5, and adjusting bolts 8 are inserted and hung vertically. An invert block for a sewage manhole, characterized in that it is fixed in place at the bottom of a sewage manhole H.