JPH03437Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a manhole with bolts that facilitates slope adjustment during manhole construction.

(Prior art) Manholes not only serve as entrances and exits for inspection and cleaning inside culverts, but also serve as ventilation and ventilation, they also serve to connect culverts to each other. The manhole must be securely connected to the culvert, and careful attention must be paid to its positioning when constructing the manhole.

This kind of manhole positioning is done by creating an accurate foundation.The method is to create a chestnut stone foundation with crushed stone, etc., pour foundation concrete to a specified thickness on top of the chestnut stone foundation, and then build the chestnut stone foundation. A mold frame is provided on both sides, and the top of the frame is set at the exact height shown in the blueprint.
Finally, the surface of the foundation concrete was finished with a wooden trowel using a leveling ruler to achieve the specified slope and height based on the above-mentioned standards.

(Problem that the invention aims to solve) As mentioned above, the height and slope of the manhole foundation were leveled using a ruler and finished with a wooden trowel, which was very time-consuming and required a lot of effort and time. had become enormous. Furthermore, concrete must be cured for at least one week after pouring, and if the height or slope becomes incorrect during that time, it is extremely difficult to correct it, wasting a lot of effort and time.

The object of the present invention is to provide a manhole with slope adjustment bolts that solves the above problems.

(Means for Solving the Problems) The present invention, as a means for solving the above-mentioned problems, includes making the lower surface of the bottom plate of the manhole body bulge in a convex shape, and drilling a plurality of screw holes in the bottom plate. A bolt is screwed into the screw hole, the bolt is made to protrude downward from the lower surface of the bottom plate, and a nut is screwed onto the bolt on the bottom plate.

(Function) When adjusting the height or slope of the manhole body using the above configuration, the present invention tightens or loosens all the nuts in the former case and some nuts in the latter case. By changing the length of the bolt that protrudes downward from the bottom of the manhole,
In the former case, the manhole body changes in the vertical direction, and in the latter case, the manhole body tilts.

(Embodiment) The illustrated embodiment of the present invention will be described based on FIG. Further, in the upper part of the bottom plate 2 and in the straight wall 3 of the manhole body 1, a culvert attachment opening 4 is provided to pass through the straight wall 3 of the manhole body 1. A substantially U-shaped notch 5 is provided on the lower surface of the bottom plate 2 at a position equidistant from the axis of the bottom plate 2 and opposite to the axis, and further, a cutout 5 is provided in the bottom plate 2 at an equal distance from the axis of the bottom plate 2, and a notch 5 is provided in the bottom plate 2, penetrating through the cutout 5. A screw hole 2a continuous to the portion 5 is bored, and a bolt 6 is screwed into the screw hole 2a. A nut 8 is screwed onto one end of the bolt 6 in a recess 7 provided in the upper part of the bottom plate 2, and the other end is made to protrude from the notch 5 to the bottom of the bottom plate 2. It is brought into contact with the upper surface of the foundation 10. Note that 11 is a contact surface formed at the other end of the bolt 6.

To lay the manhole, install the manhole body 1 on the foundation concrete 9 that has been prepared in advance, tighten or loosen the nuts 8 with a hydraulic box wrench, etc., and adjust the length of the bolts 6 in the foundation concrete 9. Since the lower surface of the bottom plate 2 is formed in a spherical shape, the manhole body 1 can be easily rotated along the foundation concrete 9 and the slope can be adjusted. Furthermore, even if the position shifts after construction, it can be easily corrected at any time until the foundation concrete 9 hardens. Further, to adjust the height, all bolts 6 may be loosened or tightened.

(Effects of the invention) This invention allows manhole positioning to be adjusted using bolts.
By using nuts, manholes can be laid regardless of the finish of the foundation, and foundation work can be done continuously in a short period of time with less labor. Moreover, even after the manhole has been laid, delicate positioning adjustments can be made until the foundation concrete hardens. Furthermore, since the configuration is simple, the complexity of the site and the number of steps are reduced, and therefore the work cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view illustrating the installation state of a manhole with slope adjustment bolts according to an embodiment of the present invention. 1... Manhole body, 2... Bottom plate, 2a...
Screw hole, 6... bolt, 8... nut.

Claims (1)

[Scope of utility model registration request] The lower surface of the bottom plate of the manhole body is bulged downward, a plurality of screw holes are bored in the bottom plate, bolts are screwed into the screw holes, and the bolts are made to protrude downward from the lower surface of the bottom plate, A manhole with a slope adjustment bolt, characterized in that a nut is screwed onto the bolt on the bottom plate.