JPH06100303B2 - Construction method of drainage pipe to sewer main and its connecting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a connection construction method for connecting a drainage pipe to a sewer main and a connecting device therefor, and particularly to a support pipe in a connection hole formed in the sewer main. The present invention relates to a connection construction method of a type in which a mortar is injected into a gap between the connection hole and a support pipe to seal the connection pipe and a drain pipe is connected to the support pipe, and a connection device therefor.

"Prior art" When connecting a drainage pipe made of synthetic resin or the like to a sewer main that has been installed horizontally below another, insert a support pipe into the connection hole formed in the sewer main and support it with the connection hole. There is a construction method in which mortar is injected into the gap between the pipes and sealed, and a drain pipe is connected to this support pipe.

[Problems to be Solved by the Invention] In the connection method described above, when mortar is injected into the gap between the connection hole and the support pipe, conventionally, the mortar flows down to the inside and outside of the sewer main and seals reliably. However, there is a drawback that workability is deteriorated especially when connecting a drainage pipe to an existing sewer main.

Also proposed is one in which a flange portion is provided on the support pipe, the flange portion is brought into contact with the sewer main via a sponge body, and the flange portion is bonded to the sewer main by impregnating the sponge body with an adhesive. However, in this case, since the sponge body is interposed, the fixing stability is poor, and since the gap between the connection hole and the support pipe is not sealed, there is a drawback that the drainage pipe cannot be connected securely and firmly. It cannot be adopted in enforcement.

Further, as a means for sealing the gap between the connection hole of the sewer main and the drainage pipe, a main pipe sealer composed of an expandable hollow body in which a recess is formed below the connection hole is arranged in the sewer main. At the same time, a drainage pipe sealer consisting of an expandable and contractible hollow body is also placed in the drainage pipe, and air is sent to both sealers to seal the branch joint between the sewer main pipe and the drainage pipe. There is also proposed a type in which the gap between the connection hole and the drainage pipe is filled with the hardening agent liquid by backflowing by filling.

However, this means requires two devices, a main pipe sealer and a drain pipe sealer, and when the pipe diameter of the sewer main is large, the main pipe sealer also becomes large. Since it needs to be installed in the main pipe in the axial direction, the whole equipment and enforcement equipment becomes large-scale, and it is necessary to remove the hardening agent adhering to the sewer main after sealing the gap. There are drawbacks such as extremely troublesome implementation.

A first object of the present invention is to eliminate the above-mentioned drawbacks of the conventional method of connecting a drainage pipe to a sewer main, and to ensure that the mortar can be poured into the sewer main without flowing down and the sealing performance is improved. Another object of the present invention is to provide a method for connecting a drainage pipe to a main sewer that can be improved and firmly fixed.

A second object of the present invention is to provide a device for connecting a drainage pipe to a sewer main, which can easily carry out the above-mentioned construction method with a small device.

"Means for Solving the Problems" A method for connecting a drainage pipe to a sewer main according to the present invention has an insertion pipe portion to be inserted into a connection hole formed in the sewer main, and is attached to an outer surface of the sewer main. In a method for connecting a drainage pipe to a sewer main for mounting a support pipe having a flange portion in contact with the sewer main and connecting a drainage pipe to the support pipe, the connection hole and the support pipe are provided in the flange portion of the support pipe. The upper opening of the gap is closed, and an internal support configured by attaching a balloon body to the tip of the pipe is inserted into the sewer main via the support pipe, and air or air is supplied to the internal support via the pipe. A state in which the lower opening of the gap is closed by the skin of the internal support by injecting and expanding a fluid such as water, the gap is sealed with mortar, and the internal support is contracted by draining the fluid. Work to pull out through the support tube with Is the law.

Further, the drainage pipe connection device to the sewer main according to the present invention has an insertion pipe portion that is inserted into a connection hole formed in the sewer main, and a support that includes a flange portion that abuts the outer surface of the sewer main. A drainage pipe connecting device for connecting a drainage pipe to a main sewerage pipe and connecting the drainage pipe to the support pipe, wherein the drainage pipe connection portion is provided at an upper portion and the insertion pipe portion is provided at a lower portion. A support tube composed of a main tube and a sheath tube provided with the above-mentioned flange portion on the outer circumference, and an internal support having a balloon body that is inflated by injecting a fluid such as air or water attached to the tip side of the pipe. , The flange portion of the support pipe closes the upper opening of the gap between the connection hole and the support pipe, and the inner support is inserted from the support pipe into the inside of the sewer main to expand the inner support, Lower opening of the gap Occluded, after sealing the said gap with mortar, which is constituted as withdrawn through the support tube in a state of being contracted the inner support.

"Operation" The support pipe is composed of a main pipe and a sheath pipe, and the length of the insertion pipe part at the tip of the main pipe corresponds to the wall thickness of the connection hole formed in the sewer main. When inserted into the connection hole formed in the pipe, the flange portion of the sheath pipe comes into contact with the outer surface of the sewer main. As a result, the tip of the insertion pipe is set at a predetermined position without protruding into the sewer main, and
The flange portion closes the upper side of the gap between the connection hole and the support pipe.

Next, the inner support is lowered from the support pipe into the inside of the sewer main, and a fluid such as air or water is injected from the pipe to expand the inner support, and the outer skin closes the lower opening of the gap. Therefore, the gap is in a state in which the upper side is closed by the flange portion of the support pipe and the lower opening portion is closed by the skin of the internal support.

In this state, when the mortar is injected from the injection hole or the like formed in the flange portion of the support pipe, the mortar is filled in the annular gap and reliably sealed. After the mortar has solidified, the internal support is pulled up through the support pipe in a state of draining and deflating the fluid, and is backfilled by connecting a drainage pipe to the upper part of the main pipe of the support pipe.

[Embodiment] An embodiment of a method for connecting a drainage pipe to a sewer main according to the present invention will be described together with the connecting device shown in FIGS. 1 to 3.

FIG. 1 is an exploded perspective view showing a drainage pipe and a support pipe, FIG. 2 is a perspective view of an internal support, and FIG. 3 is a sectional view showing a state in which the support pipe is connected to a sewer main.

In the figure, 1 is a sewer main, 2 is a connection hole formed in the sewer main 1, 3 is a drainage pipe for draining sewage or rainwater basin, and is connected to the sewer main 1 via a support pipe 4. Connected. The support pipe 4 includes an insertion pipe portion 5 to be inserted into the connection hole 2 and a flange portion 6 provided on the outer periphery thereof, and the insertion pipe portion 5 is formed to have a smaller diameter than the connection hole 2. 5 is inserted into the connection hole 2, a gap 25 is formed between the connection hole 2 and the insertion pipe portion 5, but the flange portion 6 is formed in the sewer main pipe 1.
The upper surface of the gap 25 is closed by the flange portion 6 by abutting on the outer surface 1a. A mortar injection hole 7 is formed in the flange portion 6.

The structure of the support pipe 4 will be described in detail. The support pipe 4 is composed of a main pipe 8 and a collar pipe 11 formed of synthetic resin or the like, and a large pipe for inserting and connecting the drain pipe 3 in the rear part of the main pipe 8. A diameter portion 9 and a small diameter portion 10 are formed on the front portion, and the collar pipe 11 has a flange portion 6 at the lower end of the collar portion 12.
Is provided and the small diameter portion 10 of the main pipe 8 is inserted into and fixed to the collar portion 12. The tip of the small-diameter portion 10 is projected below the flange portion 6 so that the insertion pipe portion 5
Is formed. The length of the insertion pipe portion 5 is a length corresponding to the wall thickness 1S of the sewer main pipe 1 in the connection hole 2, and the inner circumference of the rear end portion of the large diameter portion 9 has a rubber packing.
13 is arranged to seal the inserted drainage pipe 3.

Reference numeral 14 denotes a balloon-shaped internal support, which is configured to expand when a fluid L such as air or water is injected from a rear pipe 17. The internal support 14 is constructed by sandwiching the opening of the balloon body 15 between upper and lower sandwiching disks 16, and the pipe 17 is attached to the sandwiching disk 16. This internal support 14
Is inserted into the main sewer pipe 1 through the support pipe 4 in a deflated state, and by injecting and expanding the fluid L, the outer skin 18 closes the lower opening of the gap 25. . In the illustrated example, the balloon body 15 is sized so as to cover the inner wall surface of the sewer main line 1 when expanded.
When the inner diameter of the sewer main 1 is large, for example, a support pipe or the like is passed through the inside of the balloon body 15 so that the tip end of the main body can be stretched and adjusted and brought into contact with the inner bottom surface of the sewer main 1. By doing so, the balloon body 15 can be made small, or the shape of the balloon body can be made into a flat balloon shape. In short, the lower opening of the gap 25 should be closed at the time of expansion.

Next, an example of use will be described. When the insertion pipe portion 5 of the support pipe 4 is inserted into the connection hole 2 formed in the sewer main pipe 1, a gap 25 is formed between the connection hole 2 and the insertion pipe portion 5, Flange part 6
By contacting the outer surface 1a of the sewer main 1 with the gap
The top of 25 is blocked. By the flange portion 6 coming into contact with the outer surface of the sewer main pipe 1, the tip of the insertion pipe portion 5 is set at a predetermined position without protruding into the inside of the sewer main pipe 1. In this case, if a sealing material 19 which can be adhered to both sides is pasted on the outer peripheral lower surface of the flange portion 6, the support pipe 4 can be temporarily fixed to the sewer main pipe 1, and the flange portion 6 and the outer surface of the sewer main pipe 1 can be fixed. It is possible to improve the bondability with.

Next, when the inner support 14 in a state of being shrunk into the inside of the sewer main pipe 1 is lowered from the support pipe 4 and the fluid L is injected from the pipe 17, the inner support 14 expands, and in the epidermis skin thereof, the lower opening of the gap 25 is formed. Is blocked. Therefore, the gap 25 is in a state in which the upper side is closed by the flange portion 6 of the support tube 4 and the lower opening is closed by the epidermis of the inner support 14.

In this state, when the resin mortar 20 is injected from the injection hole 7 formed in the flange portion 6, the mortar 20 is filled in the annular gap 25 and is reliably sealed. After the mortar 20 is solidified, the internal support 14 is pulled up through the support pipe 4 in a state of draining the fluid L, and the drain pipe 3 is connected to the large diameter portion 9 of the support pipe 4 to backfill it. Of course, the drainage pipe 3 can be replenished sequentially.

"Effect of the invention" According to the method for connecting a drainage pipe to a sewer main according to the present invention, a support pipe used when connecting the drainage pipe to the sewer main can be reliably set, The mortar injected into the gap between the connection hole formed in the main water pipe and the support pipe does not leak inside the main sewer pipe, so it can be reliably sealed and the work becomes extremely easy and supported. The pipe can be securely and firmly fixed.

Further, according to the connection device of the present invention, the structure and operation are simple, the drain pipe can be reliably supported by the support pipe, the internal support can be downsized, and the support pipe is interposed. In other words, by only working from above, inserting into the sewer main, pumping fluid, withdrawing fluid,
Operations such as taking out the internal support can be performed and the operation is extremely easy. The internal support can, of course, be used repeatedly.

[Brief description of drawings]

The drawings show an embodiment of a device for connecting a drainage pipe to a sewer main according to the present invention. FIG. 1 is an exploded perspective view showing a drainage pipe and a support pipe, FIG. 2 is a perspective view of an internal support, and FIG. The figure is a cross-sectional view showing a state in which a support pipe is connected to a sewer main. 1: Sewer main 2: Connection hole 3: Drain pipe 4: Support pipe 5: Insert pipe part 6: Flange part 7: Mortar injection hole 8: Main pipe 11: Tsuba pipe 14: Internal support 17: Pipe 18: Internal support Body epidermis L: Fluid 20: Mortar 25: Gap

Claims (2)

[Claims] 1. A support pipe having an insertion pipe portion to be inserted into a connection hole formed in the sewer main pipe and having a flange portion that abuts an outer surface of the sewer main pipe, is attached to the sewer main pipe, and drainage is carried out to the support pipe. In the construction method of connecting a drainage pipe to a sewer main for connecting a pipe, the flange portion of the support pipe closes the upper opening of the gap between the connection hole and the support pipe, and a balloon body is attached to the tip of the pipe. The inner support body is inserted into the sewer main via the support pipe, and a fluid such as air or water is injected into the inner support body through the pipe to expand the inner support body so that the gap in the skin of the inner support body is increased. The method for connecting a drainage pipe to a sewer main, characterized in that after closing the lower opening of the container and sealing the gap with mortar, the fluid is extracted and the internal support is contracted and then withdrawn through a support pipe. . 2. A support pipe having an insertion pipe portion to be inserted into a connection hole formed in the sewer main pipe and having a flange portion that abuts an outer surface of the sewer main pipe is attached to the sewer main pipe, and drainage is carried out to the support pipe. In a drainage pipe connecting device to a sewer main for connecting pipes, a main pipe having a drainage pipe connection part in the upper part and the insertion pipe part in the lower part, and a sheath pipe having the flange part in the outer periphery And a support tube configured by and an internal support having a balloon body that is inflated by injecting a fluid such as air or water attached to the tip end side of the pipe, and the flange portion of the support tube supports the connection hole and the support hole. The upper opening of the gap with the pipe is closed, and the inner support is inserted from the support pipe into the inside of the sewer main to inflate and close the lower opening of the gap with the skin, and the gap is mortared. And seal with A device for connecting a drainage pipe to a sewer main, wherein the internal support is contracted and extracted through the support pipe.