JPH0242748Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a manhole bottom plate that can be easily connected to a connecting pipe body at a construction site.

(Prior art) For example, in Japanese Patent Application Laid-Open No. 54-35410, as shown in FIG.
A short pipe 2' having a socket 22' with a sealing annular backing 3' attached to the circumferential groove 21' is fixed to a wall 1' of a manhole or the like with a bonding agent 4' such as mortar. Proposed.

(Problem that the invention seeks to solve) However, in this case, the short pipe 2' is not formed integrally with the wall, so there is a drawback that the joint may loosen due to ground subsidence, etc., and groundwater may infiltrate into the manhole. Ta. In addition, since the axial length of the inner circumferential surface of the socket part 22' is approximately the same as the length of the socket part of the pipe body with a socket to be inserted and joined, short pipes can be connected while connecting pipes between manholes. 2' must be joined into the wall of the manhole, which also has the disadvantage of requiring a long working time.

(Means for Solving the Problems) In the present invention, a circumferential groove is provided on the inner circumferential surface of the end, and the upstream and downstream socket portions, in which sealing annular backings are attached, are formed of a bottomed cylindrical body. It is molded integrally with the side wall, and the axial length of the inner peripheral surface of the downstream side socket part can be adjusted in a short time by making it possible to adjust the insertion length of the pipe body inserted into the socket part. To provide a bottom plate for a manhole which can be easily inserted and joined with a manhole and which does not allow intrusion of groundwater or the like.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a front vertical sectional view showing one example of the present invention.

Reference numeral 1 denotes a manhole bottom plate made of fiber-reinforced resin, resin concrete, etc., in which an upstream socket 3 and a downstream socket 4 are integrally formed on the side wall of a bottomed cylinder 2. The inner diameters of the upstream and downstream sockets 3 and 4 are slightly larger than the outer diameter of the insertion port of the pipe body to which the pipes are connected.

An invert 21 is provided at the bottom of the bottomed cylinder 2. The invert 21 is for improving the flow of wastewater flowing into the manhole. The inner peripheral surfaces of the upstream side socket part 3 and the downstream side socket part 4 are sloped to the same extent as the slope of the invert 21, and peripheral grooves 31 and 4 are formed on the inner peripheral surfaces of the end portions.
1 is provided.

Step portions 32 and 42 are provided at the inner peripheral surfaces of the upstream and downstream socket portions 3 and 4, respectively. The axial length l ₁ of the inner circumferential surface of the downstream side socket part 4 is the inner circumference of the upstream side socket part 4 so that the insertion length of the pipe body inserted and joined to the said socket part 4 can be adjusted. It is longer than the axial length _l2 of the surface. The axial length _l2 of the inner circumferential surface of the upstream socket 4 is made approximately the same as the length l of the socket of the tube to be inserted and joined (see FIG. 2).
The axial length _l1 of the inner peripheral surface of the downstream socket part 4 is preferably approximately twice the axial length _l2 of the internal peripheral surface of the upstream socket part 3, preferably more than twice. .

5 and 6 are annular backings for sealing, which are made of an elastic material such as synthetic rubber.

Next, the manner of use of the present invention for joining the manhole bottom plate and the pipe body will be explained with reference to FIG. 2. The insertion part of the tube body 7 having a socket at one end is inserted into the upstream socket 3 of the downstream manhole bottom plate 1 (left side in the drawing).

Next, the insertion part of the pipe body 7' is inserted into the socket part of the pipe body 7, and the pipe joining operation is repeated in the same manner. Therefore, the distance between the downstream socket part 4 of the upstream manhole bottom plate 1 (on the right side in the drawing) and the socket end of the pipe body 7'' to which the piping is connected is longer than the length of one pipe body. When the straight pipe 8 has a short length, it is inserted deep into the inner circumferential surface of the downstream side socket 4 of the upstream manhole bottom plate 1, and the straight pipe 8 of this predetermined length is
The pipe connection is completed by sliding and inserting the straight pipe 8 into the socket end of the pipe body 7''.The length of the straight pipe 8 is such that it does not touch the socket end of the pipe body 7''. Reference numeral 9 denotes an adjusting member for aligning the levels of the invert bottom surface, the inner bottom surface of the straight pipe 8, and the inner bottom surface of the downstream side socket 4 of the manhole bottom plate 1, and as shown in FIG. A portion 91' of the tube wall of a short tube 91 having a circular cross section and having the same inner and outer diameters as the tube 8 is notched in the axial direction so that the tube diameter can be reduced and inserted.

For the adjustment member, slide the straight pipe 8 into the socket of the pipe body 7'' and insert it, then insert the straight pipe with the notch 91' above the upper opening of the bottomed cylinder 2 of the manhole bottom plate 1. 8 and the invert 21. In this way, the adjustment member 9 adjusts the socket part 4.
By aligning the internal bottom surfaces of the manholes, the internal bottom surfaces of the manholes become the same, and the flow of wastewater can be maintained uniformly.

In the above embodiment, the connection of pipes with a circular cross section was explained, but it goes without saying that this can also be done with a pipe with an oval cross section by appropriately changing the shape of the socket of the manhole bottom plate, and adjustments can be made at that time. As a member, a short tube 92 having an oval cross section shown in FIG. 4 with a portion 92' of the tube wall notched in the axial direction may be used.

(Effects of the invention) The manhole bottom plate of the invention is constructed as described above, and the upstream and downstream sockets are integrally molded with the bottomed cylinder, so it does not work like the conventional one. There is no need to connect the socket using a bonding agent such as mortar at the construction site, and there is no possibility that groundwater will infiltrate due to loosening of the joint due to ground subsidence, etc.
In addition, both sockets are of a so-called rubber ring joint type in which an annular sealing backing is attached to a circumferential groove provided on the inner circumferential surface of the end, and the axial length of the inner circumferential surface of the downstream side socket is Since the socket is configured as a so-called receptacle in which the insertion length of the pipe body inserted and joined to the socket can be adjusted, the pipe having the socket at one end of the manhole on the downstream side is The manholes can be joined together, and finally the manholes can be easily joined using an adjustment pipe of a predetermined length.

[Brief explanation of drawings]

Fig. 1 is a front vertical sectional view showing an example of the manhole bottom plate of the present invention, Fig. 2 is an explanatory diagram showing the state of connection between the manhole bottom plate of the present invention and the pipe body, and Figs. 3 and 4 are adjustment members. FIG. 5 is a front sectional view with some of the conventionally known parts omitted. 1... Bottom plate for manhole, 2... Bottomed cylinder, 21...
Invert, 3... Upstream socket, 4... Downstream socket, 31, 41... Circumferential groove, 5, 6... Annular backing for sealing, 7, 7', 7''... Pipe body, 9, 9'... Adjustment member.

Claims (1)

[Claims for Utility Model Registration] 1. An upstream socket and a downstream socket in which a circumferential groove is provided on the inner circumferential surface of the end of the side wall of the bottomed cylinder, and an annular sealing backing is attached to the circumferential groove. In the low plate for a manhole, both of the socket parts are formed integrally with the bottomed cylindrical body, and the axial length of the inner circumferential surface of the downstream socket part is inserted into and joined to the socket part. A bottom plate for a manhole, characterized in that the insertion length of a pipe body can be adjusted. 2. The manhole bottom plate according to claim 1, wherein the axial length of the inner peripheral surface of the downstream socket is approximately twice the axial length of the internal peripheral surface of the upstream socket. .