JP2886482B2 - Concrete manhole with sub tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete manhole with sub-tube and a sub-tube member for manhole.

[0002]

2. Description of the Related Art In general, when a concrete manhole is installed on a steep surface slope, a drainage inflow pipe is provided directly on a side wall of the manhole and released. When the manhole is lost due to splattering on the side walls or accumulation of dirt on the invert and its surroundings, and the step between the inflow pipe and the outflow pipe is 0.6 m or more, the manhole is used. Scouring or erosion of the bottom of the invert, etc.

For this reason, a falling pipe, that is, a sub pipe having a diameter generally smaller than the inflow pipe by one size is provided before or inside the manhole to prevent the waterfall and prevent scouring. Inspection and cleaning are not hindered (for example, see Japanese Utility Model Publication No. 60-22154).

An example of such a concrete manhole with sub-tube will be described in detail. In FIG. 4, this manhole with sub-tube is of a type in which a sub-tube is provided inside the manhole.
A ceiling 2 is covered with a lid 3. The side wall of the manhole body 1 has a drainage inflow pipe 4 made of PVC.
Are connected, and an outlet pipe 5 is connected to the bottom.

[0005] A sub-tube 7 falls from the inflow tube 4 via a cheese-like joint 6. This sub pipe 7
It is composed of an adhesive receiving collar 8, a 90 ° elbow 9 and the like, and is fixed to a side wall of the manhole body 1 by a fastener 10.

Here, the joint 6 is configured as shown in FIG. That is, the joint body 11 is made of PVC, and a rubber ring socket 12 having a slightly longer short pipe portion is provided on the inflow pipe side, and a lateral cap 13 is inserted on the opposite side thereof. The port 14, the overflow and inspection port 15 upward, and the connection pipe 16 bonded and bonded downward,
Each is provided. Since the horizontal cap 13 is subjected to dynamic pressure due to the flow of drainage from the inflow pipe 4, the insertion portion 13 </ b> A is fixed by sewing with a plurality of thumb screws 17.

The outer surface of the joint body 11 is provided with an FRP coating 18 for reinforcement and a sanding process 19 for improving mortar coking with concrete.

However, the concrete manhole with sub-tube has the following problems.

1) The diameter of the auxiliary pipe 7 is generally
The diameter is one size smaller than that, and the drainage flows down from the horizontal direction to the vertical direction, so that dirt remains in the vicinity of the insertion port 14 and the horizontal cap 13, which accumulates, thereby closing the sub pipe 7. There is a possibility that.

2) The horizontal cap 13 includes a plurality of thumb screws 1
Since it is fixed at 7, the removal is troublesome, so if the inflow pipe 4 is cleaned with a cleaning tool while keeping the cap,
It becomes difficult to insert a cleaning tool into the auxiliary pipe 7. Therefore, cleaning of the auxiliary pipe 7 requires insertion of a cleaning tool from the inspection port 15, which is troublesome.

In the concrete manhole with sub pipe shown in Japanese Utility Model Publication No. 60-22154, a triangular weir is provided at the intersection of the sub pipe and the inflow pipe to guide sewage to the sub pipe. Is provided. Therefore, in cleaning the inflow pipe and the sub-pipe, the operation of inserting the cleaning tool cannot be performed continuously, and further, if dirt accumulates on the triangular weir, the sub-pipe may be blocked, Therefore, the above-mentioned problems in the concrete manhole with sub-tube shown above still exist and cannot be adopted.

[0012]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve these problems. The gist of the invention is as follows: 1) a horizontal inflow pipe and a concrete manhole. A concrete manhole with a sub-tube characterized in that the vertical sub-tube provided inside is connected by a large-diameter elbow with a reduced diameter of 90 ° in which the inflow tube side is arranged on the large-diameter side. And 2) a horizontal inflow pipe and a vertical sub-pipe provided inside a concrete manhole are connected by a large 90 ° elbow, and the outer curved wall of the elbow is connected to the inflow pipe. A manhole made of concrete with a sub-tube, characterized by being formed on the tip surface of a plug removably fixed on substantially the same axis as that of the other side, and 3) horizontal inflow. The pipe (4) and the vertical auxiliary pipe (7) are connected by a 90 ° large bend elbow, and the elbow is connected. The curved wall (25), in the inflow pipe (4) and substantially the same axis, and is formed in the distal end surface of the plug (26) which is removably secured to the opposite side, the plug (26)
Is removably inserted into a plug insertion port (28) provided in an extension part of the elbow body that is horizontally extended integrally, and the inflow pipe (4) side and the plug insertion port ( 28) and an opening (33) opened and closed by the plug (26) at a position substantially on the same axis as the auxiliary pipe (7). In the member.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to an embodiment shown in the accompanying drawings. FIG. 1 is a sectional view of a main part of an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a side view of FIG. 1. The same or common parts as those of the conventional example shown in FIGS. Illustration and description thereof are omitted.

The present embodiment is suitable for a PVC inflow pipe provided in a concrete manhole having a diameter of 200 to 300 mmφ. Therefore, the diameter of the auxiliary pipe is the same as that of this inflow pipe. The diameter is one size lower.

In FIGS. 1 to 3, the joint 20 is provided with an inlet 21 for an inflow pipe to which a 200 mmφ inflow pipe (see reference numeral 4 in FIG. 4) is connected, and a 160 mmφ auxiliary pipe (see FIG. 4). The sub-pipe socket 22 to which the reference numeral 7 is connected)
Are formed, and based on the inlet 21 for the inflow pipe and the socket 22 for the sub-pipe, a virtual pipe of a so-called 90 ° large bend elbow having a reduced diameter is formed. Therefore, the inlet 21 for the inflow pipe and the socket 22 for the auxiliary pipe are connected by a smooth curved surface structure, which makes the flow of drainage smooth and facilitates the insertion operation of the cleaning tool.

The inner curved wall 23 of the imaginary 90 ° large-bend elbow is constituted by a joint main body 24, and a part of the outer curved wall 25 is further formed by a distal end surface 27 of a lateral socket plug 26. The outer curved wall 25A is formed by the joint body 24, respectively. Of course, the remaining outer curved wall 25A may not be provided, and all the outer curved walls 25 may be constituted by the distal end surface 27.

That is, the receiving plug (also simply referred to as a plug) 26 is a PVC injection-molded product or an FRP molded product, and has a horizontal receiving port (also referred to as a plug insertion port) in an extension of the joint body 24 extending horizontally. 28), and the receptacle plug 26 is inserted into the lateral receptacle 28. Since the distal end surface 27 of the receiving plug 26 forms the outer curved wall 25 of the virtual 90 ° large-bend elbow as described above, the distal end surface 27 is a concave curved surface that carries the upper half of the virtual conduit. It is formed with.

A flange 30 is integrally formed at the outer end of the spigot portion 29 of the socket plug 26, while the opening end of the lateral socket 28 of the joint body 24 is connected to the joint body 2.
The flange 31 is formed by a donut polyvinyl chloride plate bonded to 4. These flanges 30 and 31 are detachably fixed by a plurality of bolts and nuts (not shown). Although reference numeral 32 denotes a bolt hole, a mark (not shown) for joining these flanges 30 and 31 is provided in order to set the distal end surface 27 of the socket plug 26 in a predetermined direction.

The joint body 24 is provided with a cap insertion opening (also simply referred to as an opening) 33 in which a PVC ring 33A is fitted and adhered upward.
3, a cap 35 having a knob 34 is removably inserted. The cap 35 need not be inserted as in the conventional example shown in FIG. In FIG. 2, 1
8 shows FRP coating.

Next, the operation of this embodiment will be described. The joint main body 24 is fixed by mortar to the concrete manhole main body (1) to which the inflow pipe (4) (the reference numerals in parentheses are those shown in FIGS. 4 and 5 of the prior art, the same applies hereinafter). . Then, the inflow pipe (4) is bonded to the inflow pipe receptacle 21 and the sub pipe (7) is adhesively bonded to the sub pipe receptacle 22, and the receptacle plug 26 is inserted into the lateral receptacle 28, and the bolt and nut are used. Fix it.

Therefore, the drainage flowing through the inflow pipe (4) is transferred to the smoothly curved distal end surface 27 of the receiving plug 26.
Thereby, it smoothly flows vertically downward, and prevents accumulation of solid matter.

When cleaning the inflow pipe (4) and the auxiliary pipe (7) with a cleaning tool such as a cleaning rod, the receptacle plug 2
Even if 6 is not removed, if it is inserted from the inflow pipe (4) side, it is guided by the distal end surface 27 and the sub pipe (7) can be cleaned.

Although the joint 20 of this embodiment is formed by a TS joint for connection to the PVC inflow pipe (4), it may be constituted by a rubber ring joint as shown in FIG. A hume pipe may be used instead of a PVC pipe for the inflow pipe (4). In this case, the inflow pipe port 21 is an enlarged diameter port through which mortar coking can be performed.

Further, although the receiving plug 26 is fixed to the joint main body 24 by a flange connection, it may be a bayonet connection.

[0025]

According to the present invention, the inflow pipe and the sub pipe are connected to each other by 90.
° Since the connection was made with an elbow, the drainage smoothly flows at the connection, there is no solid matter remaining, the sub-pipe is not closed, and the cleaning tool can be easily inserted into the sub-pipe. And 9
Since the outer curved wall of the 0 ° elbow is composed of the tip of the plug,
Only by removing the plug, the secondary pipe can be cleaned in an overhaul manner.

In addition, when the sub-pipe is installed in the manhole by the piping member having a large bent elbow shape, the sub-pipe can approach the manhole wall, and the space inside the manhole is enlarged, and the manhole is enlarged. The space for inspection and cleaning work inside the tool itself is increased.

Further, according to the manhole piping member of the third aspect, by inserting and removing the plug, the plug insertion port and the opening arranged orthogonally can be simultaneously opened and closed, and the inspection of the manhole can be performed.・ The workability of cleaning is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a diagram of a conventional example.

FIG. 5 is a diagram of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Manhole main body, 4 ... Inflow pipe, 7 ... Sub pipe, 26 ... Receiving plug, 27 ... Tip surface

Claims (3)

(57) [Claims] A horizontal inflow pipe and a vertical auxiliary pipe provided inside a concrete manhole are formed by a large-diameter elbow with a reduced diameter of 90 ° in which the inflow pipe side is disposed on the large diameter side. A concrete manhole with sub-tube, characterized by being connected. 2. A horizontal inflow pipe is connected to a vertical sub-pipe provided inside a concrete manhole by a 90 ° large bending elbow, and an outer curved wall of the elbow is connected to the inflow pipe. A manhole made of a concrete with a sub-tube, characterized by being formed on the tip surface of a plug removably fixed on substantially the same axis as that on the opposite side. 3. A horizontal inlet pipe (4) and a vertical auxiliary pipe (7).
Are connected by a 90 ° large-bend elbow, and the outer curved wall (25) of the elbow is substantially coaxial with the inflow pipe (4) and the tip of a plug (26) detachably fixed to the opposite side. And a plug insertion port (28) provided in an extension portion of the elbow body extending horizontally and integrally with the plug (26).
At the portion of the extension between the side of the inflow pipe (4) and the plug insertion port (28) and substantially on the same axis as the auxiliary pipe (7). Plug (2
A piping member for a manhole, wherein an opening (33) that opens and closes according to 6) is provided.