JPH1122890A - Blocking-up structure of bored hole part of pipe conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably and easily block up a bored hole part by embedding a blocking-up piece having a through screw hole capable of being blocked up by a screw in the bored hole part of a pipe conduit, and fixing the blocking-up piece in a condition of blocking up a part between an outer periphery of this blocking-up piece and an inner periphery of the bored hole part. SOLUTION: A metallic blocking-up piece 21 which has a diameter slightly smaller than a bored hole diameter and has a through screw hole 22 in a central part, is embedded in a part of a pipe main body 5 in the bored hole part 7. When the bored hole part 7 is blocked up by using this blocking-up piece 21, first of all, the blockin-up piece 21 is held in a prescribed position, and a part between an outer periphery of the blocking-up piece 21 and an inner periphery of the bored hole part 7 is welded from the inside of a pipe. At this time, steam 13 generated from moisture in earth and sand by a temperature rise at welding time, is discharged in the pipe by passing through the through screw hole 22. After welding is completed, a backfilling material such as cement is filled in a space on the pipe outside more than the blocking-up piece 21 by using the through screw hole 22. Afterwards, the through screw hole 22 is blocked up by a screw such as a bolt, and is put in a completely blocked-up condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for closing a perforated portion of a sewer.

[0002]

2. Description of the Related Art Sewage is transported using a sewer slope, and the sewer must be laid with a correct slope. However, the ground around which the culvert is laid includes a hard ground, a soft ground, a sand ground, a clay ground, a gravel ground and the like, and the soil is often not uniform. For this reason, the installed sewer may meander in the vertical direction. In particular, it is difficult to maintain a constant slope in the propulsion work of laying a sewer while excavating underground.

FIG. 6 shows an outline of the construction work for laying a sewer pipe for sewage by the propulsion work. Here, 1 is a starting pit excavated from the ground surface 2, and 3 is a reaching pit similarly excavated, and is a pipe having a configuration in which a plurality of pipes are joined from the bottom of the starting pit 1 to the bottom of the reaching pit 3. The culvert 4 is laid by propulsion work. FIG. 7 shows an example of the cross-sectional structure of the pipe constituting the pipe 4. The illustrated pipe body has a configuration in which an exterior 6 such as concrete is formed on the outer periphery of a pipe body 5 made of ductile cast iron.

In such a case, when the soil at the propulsion site is not uniform as described above, settlement or sagging is likely to occur in the pipe 4 as shown in FIG. Conventionally, when such settlement has occurred, as shown in FIGS. 6 and 8, a hole is drilled from the bottom of the pipe into the soil, and a chemical solution 8 is injected into the soil from the drilled portion 7. Buoyancy 9 from chemical solution 8
Lifts the sewer 4 and corrects its level. Reference numeral 10 denotes a correction plan line.

[0005] When the correction of the level of the culvert 4 by the injection of the chemical solution 8 is completed, as shown in FIG. 11 is fitted, and the gap between the outer circumference of the closing piece 11 and the inner circumference of the perforated portion 7 is closed by welding from inside the pipe, and the closing piece 11 is fixed to the pipe main body 5. 1
Reference numeral 2 denotes the weld. As a result, the perforated portion 7 is completely closed.

[0006]

However, in general, sewers 4
Is covered with wet earth and sand. As shown in FIG. 10, as the temperature rises during welding, the moisture in the earth and sand becomes high-pressure water vapor 13, which is the closing piece 1 in the perforated portion 7.
It comes out from a slight gap 14 between 1 and the pipe body 5.
For this reason, there is a problem that it is difficult to completely weld and it is difficult to perform a reliable blockage.

[0007] In order to solve such a problem, the perforated portion 7 is formed by a screw hole, and after the correction of the level of the sewer by the injection of the chemical solution is completed, the screw hole may be closed with the screw. Conceivable. This is because the welding operation is not required, and the generation of water vapor is eliminated.

However, when the perforated portion 7 is formed by a screw hole, there are the following problems. That is, in order to raise the sewer 4, it is effective that the hole diameter of the perforated portion 7 is large. Therefore, generally, the diameter is 50 to 100 m
About m perforations 7 are formed. However, it is difficult to machine such a large-diameter screw hole in a pipe, and when the pipe is thin, forming such a large-diameter screw hole reduces the strength of the pipe body 5. And it becomes difficult to stop the water in the perforated portion 7.

As shown in FIG. 11, in order to machine a screw hole in the metal pipe main body 5, it is necessary to remove a portion 15 of the outer casing 6 around the same, but this outer casing 6 is placed underground. There is a problem that such a removal operation is extremely difficult because of its existence.

Accordingly, an object of the present invention is to solve such a problem and to make it possible to reliably and easily close a perforated portion of such a sewer.

[0011]

In order to achieve this object, according to the present invention, a closure piece having a threaded through hole which can be closed by a screw is fitted into a perforated portion of a sewer, and the outer periphery of the closure piece and the outer periphery of the closure piece are connected to each other. This closing piece is fixed in a state where the space between the closing piece and the inner periphery of the perforated portion is closed.

With such a configuration, high-pressure steam generated from surrounding earth and sand due to a rise in temperature during welding is
It is discharged through the through screw hole. For this reason, ejection of high-pressure steam from the gap between the outer circumference of the closing piece and the inner circumference of the perforated portion is prevented, and the closing piece is securely fixed. Further, by closing the screw hole with the screw after the fixing, the perforated portion can be easily closed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a perforated portion 7 is formed between a tube main body 5 and a sheath 6 at a bottom portion of a tube.
A metal closing piece 21 having a diameter slightly smaller than the diameter of the perforation is fitted. The closing piece 21 has a through screw hole 22 in the center.

When closing the perforated portion 7 using the closing piece 21, the closing piece 21 is first held at a predetermined position by an appropriate means as shown in FIG.
As shown in FIG. 2, the space between the outer periphery of the closing piece 21 and the inner periphery of the perforated portion 7 is welded from inside the pipe. As a result, the space between the outer circumference of the closing piece 21 and the inner circumference of the perforated portion 7 is closed, and the closing piece 21 is fixed to the pipe body 5. 23 is the welded portion.

At this time, the water vapor 13 generated from the moisture in the earth and sand due to the rise in the temperature during welding is transmitted to the through screw hole 22.
Through the pipe. For this reason, the closing piece 21
The high-pressure steam is prevented from being ejected from the gap between the outer periphery of the hole and the inner periphery of the perforated portion 7, and the closing piece 21 can be securely welded and fixed.

As described above, even if there is no water vapor spouting from the gap, if the moisture or moisture exists in the soil, the welding of the closing piece 21 tends to be difficult. Therefore, as shown in FIG. After passing the hose 24 through
If dry air or hot air 25 is sent using the hose 24, the moisture and the like can be eliminated in the portion 26 in the soil.

Further, as shown in FIG.
When the groundwater 27 exists in the pipe, the groundwater 27 can be discharged into the pipe by inserting the hose 28 into the through screw hole 22.

After the welding is completed, as shown in FIG. 5, a back filling material 29 such as cement can be filled in a space outside the closing piece 21 from the pipe by using the through screw hole 22. Then, by closing the through screw hole 22 with a screw such as a bolt, a completely closed state can be achieved.

In the above description, the metal conduit is closed by welding using the metal closure piece 21. However, the present invention is not limited to a resin conduit or a concrete pipe or the like. Applicable to metal pipes. For example, in the case of a resin culvert, the culvert and the closing piece can be bonded and fixed using an adhesive. And
In that case, complete adhesion can be performed by removing moisture and discharging groundwater using the through screw holes.

[0020]

As described above, according to the present invention, a closure piece having a through screw hole which can be closed by a screw is fitted into a perforated portion of a sewer, and the outer periphery of the closure piece and the inner periphery of the perforated portion are fitted. The high-pressure steam generated from the surrounding earth and sand due to, for example, an increase in the temperature at the time of welding the closing piece can be discharged through the through screw hole. Therefore, high pressure steam can be prevented from being ejected from a gap between the outer periphery of the closing piece and the inner periphery of the perforated portion, and the closing piece can be securely fixed.
In addition, by closing the screw hole with the screw after the fixation, it is possible to easily achieve reliable closing of the perforated portion.

[Brief description of the drawings]

FIG. 1 is a sectional view of a closed structure of a perforated portion of a sewer according to an embodiment of the present invention.

FIG. 2 is a view showing a state at the time of welding the closing piece in FIG. 1;

FIG. 3 is a diagram showing a state of discharging moisture using a through screw hole of a closing piece in FIG. 1;

FIG. 4 is a view showing a state of drainage of groundwater using a threaded hole of a closing piece in FIG. 1;

FIG. 5 is a view showing a state in which a backfill material is filled by using a through screw hole of the closing piece in FIG. 1;

FIG. 6 is a diagram showing a schematic configuration of a conventional sewer laid by propulsion work, to which the closed structure of a perforated portion of a sewer according to the present invention can be applied.

FIG. 7 is a cross-sectional view of a pipe constituting the pipe of FIG. 6;

FIG. 8 is a cross-sectional view showing a state in which a perforated portion is formed in the tube of FIG. 7;

FIG. 9 is a cross-sectional view of a conventional structure for closing a perforated portion of a sewer.

FIG. 10 is a cross-sectional view showing a situation when the closing structure of FIG. 9 is formed.

FIG. 11 is a view showing another example of the conventional structure for closing a perforated portion of a sewer, instead of the structure for closing a perforated portion of a sewer in FIG. 9;

[Explanation of symbols]

 5 Pipe main body 6 Exterior 7 Drilling part 21 Closure piece 22 Through screw hole 23 Weld

Claims (1)

[Claims] 1. An obturating piece having a through screw hole that can be closed by a screw is fitted into a perforated portion of a sewer, and the space between the outer periphery of the obstructing piece and the inner periphery of the perforated portion is closed. A closure structure for a perforated portion of a sewer, wherein a closure piece is fixed.