JP6820694B2 - Construction method of buried pipe and burial aid for buried pipe used in the construction method - Google Patents

Description

The present invention relates to a construction method for buried pipes and an auxiliary tool for burying buried pipes used in the construction method.

When burying buried pipes such as gas pipes in the ground of public land such as under roads, the excavation method is uneconomical because it takes a large excavation range, and the range of traffic obstacles and construction pollution is large. There was a problem of expansion. Therefore, it is desired to construct a buried pipe by appropriately laying the buried pipe while reducing the excavation range.

As a construction method of a buried pipe for appropriately laying a buried pipe in the ground while reducing the excavation range, for example, a propulsion method described in Patent Document 1 is known.
In this propulsion method, instead of excavating the ground widely and laying a buried pipe in the ground, a starting resistance and a reaching resistance are constructed, and a hole is cut in the ground from the starting resistance to the reaching resistance. It is a construction method in which the buried pipe is pushed in and the buried pipe is laid.
However, this method is problematic because the wall surface and ground of the reaching resistance may partially collapse when the buried pipe is pushed into the ground while cutting a hole from the starting resistance to the reaching resistance. Become. This is because when the buried pipe reaches the reaching resistance by the propulsion method, the wall surface of the reaching resistance is destroyed so as to break from the underground side. In such a case, for example, if the ground collapses under the road, due to safety issues and legal and regulatory restrictions, it will be necessary to excavate and repair the road above the collapsed part.

As another example of the construction method of the buried pipe in which the buried pipe is appropriately laid in the ground while reducing the excavation range, a method of replacing the buried pipe as disclosed in Patent Document 2, for example, is known. ..
The construction method for buried pipes disclosed in Patent Document 2 is a so-called punching method. That is, when the old pipe is buried in advance, the old pipe is pulled out from the arrival side while pushing the old pipe from the starting side with the new pipe, and the new pipe can be buried under non-cutting. is there.
The construction method of the buried pipe using the punching method is suitable in that the ground on the opposite side of the arrival is unlikely to collapse. However, the new pipe may be easily damaged, which is a problem. This is because when the old pipe is pushed directly by the new pipe, excessive stress is applied to the new pipe.

Japanese Unexamined Patent Publication No. 6-248876 Japanese Unexamined Patent Publication No. 2001-27093

As described above, when laying a buried pipe, it is desired to realize a construction method of the buried pipe that is efficient without excavating the ground widely, avoids the collapse of the ground, and can suppress the damage of the buried pipe. ..

The present invention has been made in view of such an actual situation, and an object of the present invention is that when laying a buried pipe, the ground is not widely excavated and it is economical, the ground collapse is avoided, and the buried pipe is damaged. It is an object of the present invention to provide a construction method of a buried pipe and an auxiliary tool for burying a buried pipe used in the construction method.

The construction method of the buried pipe according to the present invention for achieving the above object is
When the second buried pipe is newly installed when the first buried pipe is not buried, a starting resistance is constructed on one end side of the tubular burial site where the first buried pipe is buried. The construction step, the reach resistance construction step of constructing the reach resistance on the other end side of the planned burial site, and the burial step of laying the first burial pipe at the planned burial site by the propulsion method from the start resistance. conducted, further, the first buried pipe is embedded, the second by pressing with embedded aid mounted on buried pipe, one starting anti side constructed on the end side of said first buried pipe The point is to carry out a replacement step of replacing the first buried pipe with the second buried pipe by pushing the first buried pipe to the reaching side constructed on the other end side of the first buried pipe.

According to the above configuration, in the replacement step, the first buried pipe buried in the ground is pressed by the burial auxiliary tool attached to the second buried pipe, and the so-called punching method is used to move from the starting side to the reaching side. By punching out, the second buried pipe will be laid at the position where the first buried pipe was.
In this case, if the starting resistance is built on one end side of the first buried pipe and the reaching resistance is built on the other end side of the first buried pipe, the place where the first buried pipe is buried ( Since the replacement step can be carried out and the second buried pipe can be laid without excavating the ground on the upper side of the planned burial place where the second buried pipe is to be buried, the excavation range can be narrowed, which is economical.

In addition, since the buried first buried pipe is only pressed from the starting opposite side end of the first buried pipe with the burying auxiliary tool attached to the second buried pipe and pushed out to the reaching opposite side, the surroundings It is possible to avoid giving stress to the ground and the like, and to avoid the collapse of the ground and the like when laying the second buried pipe.

Further, since the first buried pipe is pressed by the buried auxiliary tool attached to the second buried pipe, the second buried pipe and the first buried pipe do not come into direct contact with each other. Therefore, damage such as deformation of the second buried pipe can be avoided. Further, it is possible to prevent the second buried pipe from being deformed and giving stress to the surrounding ground or the like, and as a result, it is possible to avoid the collapse of the ground or the like when the second buried pipe is laid.

Therefore, when laying the second buried pipe, it is economical without excavating the ground widely, it is possible to avoid the collapse of the surrounding ground where the second buried pipe is buried, and it is possible to suppress the damage of the second buried pipe. It is possible to provide a construction method for buried pipes.
Further, according to this construction method, for example, when the first buried pipe is a hard metal pipe, the first buried pipe is replaced with a relatively soft second buried pipe made of resin, and a second buried pipe is newly installed. It is also possible to do.

Further , according to the above configuration, even when the first buried pipe is not buried, the burying step of laying the first buried pipe and the buried first buried pipe are replaced with the second buried pipe. By performing the replacement step, it is possible to provide a construction method of a buried pipe which is economical without excavating the ground widely, avoids the collapse of the ground, and can suppress the damage of the buried pipe.
That is, when the first buried pipe to be buried does not exist, the starting resistance construction step of constructing the starting resistance on one end side of the tubular burial site where the first buried pipe is buried, and the burial If the reaching resistance construction step of constructing the reaching resistance to the other end side at the planned location is carried out, and further the burial step is carried out to lay the first buried pipe at the planned burial site, then the replacement step is performed. By carrying out, a second buried pipe can be newly laid.

In the burial process of burying the first burial pipe, the first burial pipe is propelled by the propulsion method from the start resistance, and the tubular burial site where the first burial pipe is buried (the second burial pipe is buried). It will be laid at the planned burial site). In this way, since the propulsion method is used in the burial process, when the first burial pipe is laid, the ground above the tubular burial site where the first burial pipe is to be buried is not excavated. The range can be narrowed and it is economical.

Therefore, when the second buried pipe is laid as a new pipe when the first buried pipe is not buried, it is economical without excavating the ground widely and avoids the collapse of the surrounding ground where the second buried pipe is buried. However, it is possible to provide a construction method for a buried pipe that can suppress damage to the second buried pipe.
Further, according to this construction method, for example, even if the second buried pipe is a soft resin pipe and the second buried pipe cannot be directly buried by the propulsion method, it can be used as the first buried pipe. If a hard metal pipe or the like is used, the first buried pipe can be buried by the propulsion method, so that the first buried pipe can be replaced with the second buried pipe and a new second buried pipe can be laid.

Further characteristic composition of the construction method of the buried pipe according to the present invention is
The point is that after the start anti-construction step is carried out, the burial step is carried out, then the reach anti-construction step is carried out, and further the replacement step is carried out.

According to the above configuration, when it is desired to newly lay a second buried pipe, which is a new pipe, a burial process of laying a first buried pipe is carried out before first constructing a starting resistance and then constructing a reaching resistance. Will be done.
Therefore, since there is no reaching resistance in the burial process, there is no wall surface that collapses on the front side of the first burial pipe in the propulsion direction of the first burial pipe. Therefore, when the first buried pipe is buried, the collapse of the ground or the like can be reliably avoided. If the reachable pipe is constructed after the first buried pipe is buried, then the replacement step can be carried out to lay the second buried pipe.

Therefore, when the second buried pipe is laid as a new pipe when the first buried pipe is not buried, it is economical without excavating the ground widely, and the surrounding ground where the second buried pipe is buried is surely collapsed. It is possible to provide a construction method for buried pipes that can be avoided.

Further characteristic composition of the construction method of the buried pipe according to the present invention is
The burial aid is inserted into the second burial pipe, the tip portion mounted on one end side of the second burial pipe, the rear end portion mounted on the other end side of the second burial pipe, and the second burial pipe. A support portion for supporting the front end portion and the rear end portion is provided.
The tip portion includes a first insertion portion that loosely fits into the start-reverse end portion of the first buried pipe, and an end portion that is one end side of the second buried pipe and that faces the first buried pipe. A second insertion portion that is loosely fitted into the pipe, and a pressing portion that is provided between the first insertion portion and the second insertion portion and presses the end of the first embedded pipe on the starting edge side. Prepare,
In the replacement step, the rear end portion is pressed from the outside, and the end portion on the starting edge side of the first buried pipe is pressed via the support portion and the pressing portion of the tip portion.

Further, the characteristic configuration of the buried pipe burial aid used in the buried pipe construction method according to the present invention is as follows.
A tip portion mounted on one end side of the second buried pipe, a rear end portion mounted on the other end side of the second buried pipe, and the tip portion and the rear end mounted in the second buried pipe. With a support part to support the part,
The tip portion includes a first insertion portion that loosely fits into the start-reverse end portion of the first buried pipe, and an end portion that is one end side of the second buried pipe and that faces the first buried pipe. A second insertion portion that is loosely fitted into the pipe, and a pressing portion that is provided between the first insertion portion and the second insertion portion and presses the end of the first embedded pipe on the starting edge side. It is in the point of having.

According to the above configuration, when the buried first buried pipe is pressed by the burial auxiliary tool attached to the second buried pipe and the first buried pipe is pushed out from the starting side to the reaching side, The first insertion part at the tip of the burial aid is loosely fitted to the starting end of the first burial pipe, and the second insertion part is the side facing the first burial pipe, which is one end side of the second burial pipe. It is loosely fitted to the end portion of the first buried pipe, and the pressing portion presses the end portion on the starting side of the first buried pipe.
When the first buried pipe is pressed and pushed out with the tip portion loosely fitted to the first buried pipe and the second buried pipe in this way, the first buried pipe and the second buried pipe are buried. They are in a state of restraining each other through the tip of the auxiliary tool. Further, the axis of the first buried pipe and the axis of the second buried pipe are on the same axis.
Since the axis of the first buried pipe and the axis of the second buried pipe are on the same axis, when the first buried pipe is pressed and pushed out by the second buried pipe equipped with the burial aid. , The first buried pipe and the second buried pipe do not cause misalignment, and the first buried pipe is pushed straight and surely toward the arrival side along the axial direction of the second buried pipe. be able to.

Further, since the pressing portion for pressing the start-reverse end of the first buried pipe is provided between the first insertion portion and the second insertion portion, the second buried pipe is directly connected to the first buried pipe. Do not touch. Therefore, it is possible to prevent the second buried pipe from coming into contact with the first buried pipe and being damaged.
Since the tip portion provided with the pressing portion is supported by the rear end portion via the support portion inserted into the second embedded pipe, the tip portion receives the pressing force applied to the rear end portion from the outside. The first buried pipe can be pressed by the pressing portion. In other words, in the replacement step of replacing the first buried pipe with the second buried pipe, the rear end portion of the buried auxiliary tool is pressed from the outside, and the first is made through the supporting portion and the pressing portion of the tip portion of the buried auxiliary tool. By pressing the end of the buried pipe on the starting opposite side, the first buried pipe is replaced with the second buried pipe.

That is, the stress for pressing the first buried pipe is applied to the buried auxiliary tool from the outside. Then, the burial aid is a pressing force that presses the first burial pipe through the pressing portion at the tip without transmitting the applied stress to the second burial pipe. Therefore, it is possible to prevent the second buried pipe from being damaged by stress given from the outside.

That is, the tip of the burial aid is attached to one end of the second burial pipe (the side facing the first burial pipe). Then, the burial aid directly transmits the pressing force applied at the rear end to the starting edge of the first burying pipe as a pressing force without applying stress to the second buried pipe. To do. Therefore, the second burial pipe equipped with the burial aid is protected by the burial aid. Therefore, the first buried pipe can be pushed out by pressing the first buried pipe without damaging the second buried pipe. Further, even when the second buried pipe is softer or fragile than the first buried pipe, the first buried pipe can be pressed to push out the first buried pipe.

The characteristic configuration of the buried pipe burial aid used in the buried pipe construction method according to the present invention is
The rear end portion includes a positioning portion that is loosely fitted to the other end side of the second buried pipe, and a transmission portion that has a diameter larger than that of the second buried pipe and receives a pressing force from the outside. It is in.

According to the above configuration, the rear end portion of the burial aid is loosely fitted to the other end side of the second burial pipe by the positioning portion.
That is, in the second buried pipe, the second insertion portion of the tip portion is loosely fitted to one end side, and the positioning portion of the rear end portion is loosely fitted to the other end side. Since the tip of the burial aid is supported by the rear end via the support inserted into the second burial pipe, the second burial pipe is connected to the tip and rear via the support. It becomes a state of being restrained by the end.
Therefore, when the first buried pipe is pressed and pushed out by the second buried pipe equipped with the buried auxiliary tool, the axis of the second buried pipe and the axis of the rear end are on the same axis. Will be done. Further, since the tip portion is also loosely fitted to the second buried pipe, the axis of the rear end portion and the axis of the tip portion are present on the same axis. That is, the axis of the second buried pipe and the burial auxiliary tool are present on the same axis.

Since the axis of the second buried pipe and the buried auxiliary tool are on the same axis, when the first buried pipe is pressed and pushed out by the second buried pipe equipped with the buried auxiliary tool, the second The buried pipe does not cause core deviation with respect to the buried auxiliary tool. Further, since the tip portion is loosely fitted to the first buried pipe and the second buried pipe, the first buried pipe and the second buried pipe do not cause core deviation.
As a result, the first buried pipe, the second buried pipe, and the buried auxiliary tool can be more reliably pushed out by the second buried pipe equipped with the buried auxiliary tool without causing core deviation. ..

The characteristic configuration of the buried pipe burial aid used in the buried pipe construction method according to the present invention is
The positioning portion is configured as a plurality of columnar protrusions having the same axis and different outer diameters.

According to the above configuration, a second buried pipe having a plurality of inner diameters corresponding to the outer diameters of the plurality of columnar protrusions can be loosely fitted to the positioning portion. That is, one rear end portion can be used for laying a plurality of buried pipes having different inner diameters.
Therefore, when it is necessary to lay buried pipes having a plurality of diameters at the construction site where the buried pipes are laid, the number of members to be prepared at the construction site can be reduced, which is preferable.
The construction method of the buried pipe according to the present invention for achieving the above object is
The first buried pipe to be buried is pressed by the burying auxiliary tool attached to the second buried pipe, and the first buried pipe is formed from the starting counter side constructed on one end side of the first buried pipe. A replacement step was carried out in which the first buried pipe was replaced with the second buried pipe by pushing it to the reaching side constructed on the other end side.
The burial aid is inserted into the second burial pipe, the tip portion mounted on one end side of the second burial pipe, the rear end portion mounted on the other end side of the second burial pipe, and the second burial pipe. A support portion for supporting the front end portion and the rear end portion is provided.
The tip portion includes a first insertion portion that loosely fits into the start-reverse end portion of the first buried pipe, and an end portion that is one end side of the second buried pipe and that faces the first buried pipe. A second insertion portion that is loosely fitted into the pipe, and a pressing portion that is provided between the first insertion portion and the second insertion portion and presses the end of the first embedded pipe on the starting edge side. Prepare,
In the replacement step, the rear end portion is pressed from the outside, and the end portion on the starting edge side of the first buried pipe is pressed via the support portion and the pressing portion of the tip portion.
According to the above configuration, in the replacement step, the first buried pipe buried in the ground is pressed by the burial auxiliary tool attached to the second buried pipe, and the so-called punching method is used to move from the starting side to the reaching side. By punching out, the second buried pipe will be laid at the position where the first buried pipe was.
In this case, if the starting resistance is built on one end side of the first buried pipe and the reaching resistance is built on the other end side of the first buried pipe, the place where the first buried pipe is buried ( Since the replacement step can be carried out and the second buried pipe can be laid without excavating the ground on the upper side of the planned burial place where the second buried pipe is to be buried, the excavation range can be narrowed, which is economical.
In addition, since the buried first buried pipe is only pressed from the starting opposite side end of the first buried pipe with the burying auxiliary tool attached to the second buried pipe and pushed out to the reaching opposite side, the surroundings It is possible to avoid giving stress to the ground and the like, and to avoid the collapse of the ground and the like when laying the second buried pipe.
Further, since the first buried pipe is pressed by the buried auxiliary tool attached to the second buried pipe, the second buried pipe and the first buried pipe do not come into direct contact with each other. Therefore, damage such as deformation of the second buried pipe can be avoided. Further, it is possible to prevent the second buried pipe from being deformed and giving stress to the surrounding ground or the like, and as a result, it is possible to avoid the collapse of the ground or the like when the second buried pipe is laid.
Therefore, when laying the second buried pipe, it is economical without excavating the ground widely, it is possible to avoid the collapse of the surrounding ground where the second buried pipe is buried, and it is possible to suppress the damage of the second buried pipe. It is possible to provide a construction method for buried pipes.
Further, according to this construction method, for example, when the first buried pipe is a hard metal pipe, the first buried pipe is replaced with a relatively soft second buried pipe made of resin, and a second buried pipe is newly installed. It is also possible to do.
Further, according to the above configuration, when the buried first buried pipe is pressed by the burying auxiliary tool attached to the second buried pipe and the first buried pipe is pushed out from the starting side to the reaching side. The first insertion part at the tip of the burial aid is loosely fitted to the start-opposite end of the first burial pipe, and the second insertion part faces the first burial pipe, which is one end side of the second burial pipe. It is loosely fitted to the end on the side to be pressed, and the pressing portion presses the end on the starting side of the first buried pipe.
When the first buried pipe is pressed and pushed out with the tip portion loosely fitted to the first buried pipe and the second buried pipe in this way, the first buried pipe and the second buried pipe are buried. They are in a state of restraining each other through the tip of the auxiliary tool. Further, the axis of the first buried pipe and the axis of the second buried pipe are on the same axis.
Since the axis of the first buried pipe and the axis of the second buried pipe are on the same axis, when the first buried pipe is pressed and pushed out by the second buried pipe equipped with the burial aid. , The first buried pipe and the second buried pipe do not cause misalignment, and the first buried pipe is pushed straight and surely toward the arrival side along the axial direction of the second buried pipe. be able to.
Further, since the pressing portion for pressing the start-reverse end of the first buried pipe is provided between the first insertion portion and the second insertion portion, the second buried pipe is directly connected to the first buried pipe. Do not touch. Therefore, it is possible to prevent the second buried pipe from coming into contact with the first buried pipe and being damaged.
Since the tip portion provided with the pressing portion is supported by the rear end portion via the support portion inserted into the second embedded pipe, the tip portion receives the pressing force applied to the rear end portion from the outside. The first buried pipe can be pressed by the pressing portion. In other words, in the replacement step of replacing the first buried pipe with the second buried pipe, the rear end portion of the buried auxiliary tool is pressed from the outside, and the first is made through the supporting portion and the pressing portion of the tip portion of the buried auxiliary tool. By pressing the end of the buried pipe on the starting opposite side, the first buried pipe is replaced with the second buried pipe.
That is, the stress for pressing the first buried pipe is applied to the buried auxiliary tool from the outside. Then, the burial aid is a pressing force that presses the first burial pipe through the pressing portion at the tip without transmitting the applied stress to the second burial pipe. Therefore, it is possible to prevent the second buried pipe from being damaged by stress given from the outside.
That is, the tip of the burial aid is attached to one end of the second burial pipe (the side facing the first burial pipe). Then, the burial aid directly transmits the pressing force applied at the rear end to the starting edge of the first burying pipe as a pressing force without applying stress to the second buried pipe. To do. Therefore, the second burial pipe equipped with the burial aid is protected by the burial aid. Therefore, the first buried pipe can be pushed out by pressing the first buried pipe without damaging the second buried pipe. Further, even when the second buried pipe is softer or fragile than the first buried pipe, the first buried pipe can be pressed to push out the first buried pipe.

Schematic block diagram of the construction method of buried pipes Configuration of burial aid and relationship diagram between first burial pipe and second burial pipe Configuration diagram of the tip Configuration diagram of the rear end Configuration diagram of the support shaft Configuration diagram of the extension indicator shaft Explanatory drawing of start anti-construction process (before start anti-construction) Explanatory drawing of start anti-construction process (after start anti-construction) Explanatory drawing of burial process (at the time of burial) Explanatory drawing of burial process (after burial) Explanatory drawing of reaching anti-construction process Explanatory drawing of replacement process Explanatory drawing at the end of the replacement process Explanatory drawing of removal process (at the beginning of sealing process) Explanatory drawing of removal process (immediately before completion of sealing process) Explanatory drawing of removal process (at the end of sealing process) Explanatory drawing at the completion of the removal process

The construction method of the buried pipe and the buried auxiliary tool according to the embodiment of the present invention will be described with reference to FIGS. 1 to 17.
First, the outline of the construction method of the buried pipe according to the present embodiment will be described.

As shown in FIG. 1, in the construction method of the buried pipe according to the present embodiment, the buried first buried pipe 10 is pressed by the burying auxiliary tool 100 attached to the second buried pipe 20, and the first burial is performed. The first buried pipe 10 is pushed out from the starting resistance 40 side constructed on one end side of the pipe 10 to the reaching resistance 50 side constructed in the ground on the other end side of the first buried pipe 10. A replacement step of replacing with the second buried pipe 20 is carried out.
Although FIG. 1 shows a part of the replacement process, the burial aid 100 is pressed by the pressing force generating portion 91, and the pressing force reaches the first embedded pipe 10 from the side of the starting resistance 40. The case of pressing toward the side of 50 is shown.

This replacement step will be described in detail later, but is carried out in at least the following three situations.
(1) When the second buried pipe 20 is newly installed in a state where the first buried pipe 10 is not buried.
(2) When the first buried pipe 10 is replaced with the second buried pipe 20 while the first buried pipe 10 is buried.
(3) When the first buried pipe 10 is removed while the first buried pipe 10 is buried.

Next, the outline of the burial aid 100 used in the burial pipe construction method according to the present embodiment will be described.
After the burying auxiliary tool 100 according to the present embodiment is attached to the tip portion 110 attached to the end portion 22 on one end side of the second buried pipe 20 and the end portion 21 on the other end side of the second buried pipe 20. It includes an end portion 130 and a support portion 120 that is inserted into the second buried pipe 20 to support the tip portion 110 and the rear end portion 130, and the tip portion 110 is an end portion on the starting opposite side of the first buried pipe 10. The first insertion portion 111 that loosely fits into 11, the second insertion portion 112 that loosely fits into the end portion 22 on the side facing the first buried pipe 10 that is one end side of the second buried pipe 20, and the first insertion portion. It is provided between the 111 and the second insertion portion 112, and includes a pressing portion 113 that presses the end portion 11 on the starting opposite side of the first buried pipe 10.

FIG. 2 shows an outline of the burial aid 100, the first burial pipe 10, and the second burial pipe 20.
FIG. 2 shows the positional relationship between the burial aid 100, the second burial pipe 20, and the first burial pipe 10 when the burial aid 100 is used, and the burial aid 100 attached to the second burial pipe 20. The figure shows the positional relationship when the first buried pipe 10 is pressed.

In this example, the case where the first buried pipe 10 and the second buried pipe 20 are buried pipes used for the gas pipe is shown.
Further, in this example, the case where the burial aid 100, the first burial pipe 10, and the second burial pipe 20 are made of the following materials is shown.
Each member constituting the burial aid 100 is made of stainless steel.
The first buried pipe 10 is a cast iron pipe made of iron.
The second buried pipe 20 is a polyethylene pipe made of polyethylene, which is softer than a cast iron pipe. Therefore, the second buried pipe 20 is more easily damaged than the cast iron pipe.
The combination of materials of the first buried pipe 10 and the second buried pipe 20 is a gas pipe renewal work in which the old gas pipe cast iron pipe is replaced with a new polyethylene pipe for gas pipe having excellent durability and the like. It is assumed that the construction will be carried out.

Since this example is an example, the combination of the first buried pipe 10 and the second buried pipe 20 is not limited.
However, this construction method is particularly suitable when the second buried pipe 20 is softer than the first buried pipe 10 or when it is easily damaged during laying.

To exemplify the pipe materials assumed as the first buried pipe 10, when the first buried pipe 10 is a gas pipe, a resin such as a polyethylene pipe, a polypropylene pipe, a vinyl chloride pipe, and a pipe material using a fluororesin-based material, etc. Examples of pipe materials made of steel, cast iron pipes, steel pipes, stainless steel pipes, etc. can be listed.
If the first buried pipe 10 is other than a gas pipe, it may be further a pipe material.

To exemplify the pipe materials assumed as the second buried pipe 20, when the second buried pipe 20 is a gas pipe, in addition to the polyethylene pipe, a polypropylene pipe, a vinyl chloride pipe, a pipe material using a fluororesin-based material, etc. There are resin tube materials. It may also be a cast iron pipe, a steel pipe, a stainless steel pipe, or the like.
If the second buried pipe 20 is other than a gas pipe, it may be further a pipe material.

In the construction method of the buried pipe of the present embodiment, when a so-called hydraulic jack for earth retaining is used as the pressing force generating portion 91, the pipe diameters of the first buried pipe 10 and the second buried pipe 20 are JIS standards. It is particularly suitable when the nominal diameter is 32A to 100A. Specifically, pipe materials having nominal diameters of 32A, 50A, 75A, and 100A are typical examples.
In this example, the case where the burial aid 100 corresponding to the above pipe diameter is used is illustrated.

The pipe diameters of the first buried pipe 10 and the second buried pipe 20 are not limited to the above pipe diameters, and when another pressing device is used as the pressing pressure generating unit 91 (for example, as the pressing pressure generating unit 91). , When using an electro-hydraulic jack that is stronger than the hydraulic jack for earth retaining), the method of constructing the buried pipe of the present embodiment can be suitably used even if the pipe material has a larger diameter. ..

In this example, the first buried pipe 10 and the second buried pipe 20 are pipe members having the same nominal diameter. However, since the materials of the first buried pipe 10 and the second buried pipe 20 are different from each other, when JIS standard pipe members are used, the actual outer diameter of the first buried pipe 10 is slightly larger than that of the second buried pipe 20. growing. However, usually, the outer diameter difference is about 1 mm.
Further, the actual size of each inner diameter shows the case where the first buried pipe 10 is slightly smaller than the second buried pipe 20.
This construction method is particularly suitable when the pipe diameter of the first buried pipe 10 to the second buried pipe 20 is 100 A or less.
Further, it can be suitably used when the outer diameter of the second buried pipe 20 is the same as the outer diameter of the first buried pipe 10 in actual size, or when it has the same nominal diameter and is slightly smaller in actual size.

The tip portion 110 will be described with reference to FIGS. 2 and 3.
The tip portion 110 includes a first insertion portion 111, a second insertion portion 112, a pressing portion 113, and a tip connection portion 114.

The first insertion portion 111 is configured to fit inside the first buried pipe 10. In this example, the first insertion portion 111 is loosely fitted to the end portion 11 on the starting opposite side of the first buried pipe 10. The first insertion portion 111 is a portion of the tip portion 110 for being internally fitted into the end portion 11 of the first buried pipe 10.

The first insertion portion 111 is formed in a substantially columnar shape so as to be loosely fitted in the pipe of the first buried pipe 10. That is, the first insertion portion 111 is formed in a columnar shape having an outer diameter slightly smaller than the inner diameter of the first buried pipe 10, and is loosely fitted into the pipe of the first buried pipe 10.
The end portion of the first insertion portion 111 on the side of the first buried pipe 10 is chamfered, for example, so that it can be easily fitted into the first buried pipe 10.
In this example, the first insertion portion 111 includes a linearly moving portion 111b of a straight body and a chamfered portion 111a.

The thickness of the first insertion portion 111, that is, the depth of the first insertion portion 111 to be fitted into the first embedded pipe 10 is, for example, 10 mm. With this thickness, when the first insertion portion 111 is internally fitted into the first buried pipe 10, the fitting portion between the first insertion portion 111 and the first buried pipe 10 does not unexpectedly come off in normal handling. It suffices to have a certain thickness.

As will be described later, in the burial auxiliary tool 100, after being attached to the second burial pipe 20, the first insertion portion 111 is internally fitted into the first burial pipe 10, so that the first insertion portion 111 includes a chamfered portion 111a. If this is the case, the workability when the first insertion portion 111 is fitted into the first buried pipe 10 is remarkably improved, which is preferable.

The second insertion portion 112 is configured to fit inside the second buried pipe 20. In this example, the second insertion portion 112 is loosely fitted to the end portion 22 of the second buried pipe 20 on the side facing the first buried pipe 10. The second insertion portion 112 is a portion of the tip portion 110 for being internally fitted into the end portion 22 of the second buried pipe 20.

The second insertion portion 112 is formed in a substantially columnar shape so as to be loosely fitted in the pipe of the second buried pipe 20. That is, the second insertion portion 112 is formed in a columnar shape having an outer diameter slightly smaller than the inner diameter of the second buried pipe 20, and is loosely fitted into the pipe of the second buried pipe 20.
The end portion of the second insertion portion 112 on the side of the second buried pipe 20 is chamfered, for example, so that it can be easily fitted into the second buried pipe 20.

The thickness of the second insertion portion 112 is, for example, 10 mm. That is, the depth of the second insertion portion 112 to be fitted into the second buried pipe 20 is, for example, 10 mm. With this thickness, when the second insertion portion 112 is internally fitted into the second buried pipe 20, the fitting portion between the second insertion portion 112 and the second buried pipe 20 does not suddenly come off in normal handling. It suffices to have a certain thickness.

The relationship between the first insertion portion 111 and the second insertion portion 112 will be supplemented.
The outer diameter of the first insertion portion 111 and the outer diameter of the second insertion portion 112 are usually approximately the same. However, when the materials and specifications of the first buried pipe 10 and the second buried pipe 20 are different, the outer diameter of the first insertion portion 111 and the outer diameter of the second insertion portion 112 are usually approximately the same. However, it may be slightly different.
In this example, since the inner diameter of the first buried pipe 10 is slightly larger than that of the second buried pipe 20, the outer diameter of the first insertion portion 111 is slightly larger than the outer diameter of the second insertion portion 112. .. When the first buried pipe 10 is a cast iron pipe and the second buried pipe 20 is a polyethylene pipe, the difference in inner diameter between them is at most about 15 mm.

The pressing portion 113 is provided between the first insertion portion 111 and the second insertion portion 112, and functions as a connecting portion between the first insertion portion 111 and the second insertion portion 112. It also functions as a portion that presses the first buried pipe 10.
The pressing portion 113 is usually a columnar member having the same outer diameter as the first buried pipe 10 or the second buried pipe 20 or having a slightly larger outer diameter. The columnar shape includes, for example, a columnar shape or a conical shape.
In this example, since the outer diameter of the first buried pipe 10 is slightly smaller than that of the second buried pipe 20, the pressing portion 113 has a conical shape that is slightly reduced in diameter from the first insertion portion 111 to the second insertion portion 112. Shows the case.
Further, the outer diameter of the maximum diameter portion of the pressing portion 113 is slightly larger than that of the second buried pipe 20. Assuming that the outer diameter of the maximum diameter portion of the pressing portion 113 is slightly larger than that of the second buried pipe 20, when the first buried pipe 10 is replaced with the second buried pipe 20, the second buried pipe 20 Easy to insert. This is because the pressing portion 113 expands the diameter of the space where the first buried pipe 10 was present.
The thickness of the pressing portion 113 is, for example, 10 mm. This thickness may be a thickness having a strength that does not deform or break when the pressing portion 113 presses the first embedded pipe 10.

The relationship between the tip portion 110, the first buried pipe 10, and the second buried pipe 20 will be supplemented.
As shown in FIG. 2, the tip portion 110, the first buried pipe 10, and the second buried pipe 20 share the same axis P.

The support portion 120 is a member that supports the tip portion 110 from the inside of the second buried pipe 20. This will be described below with reference to FIGS. 2, 3, 4, 5, and 6.
The support portion 120 includes a support shaft portion 121, a rear end support connection portion 123 at one end of the support shaft portion 121, a tip support connection portion 124 at the other end of the support shaft portion 121, and a lock nut 125.
The support shaft portion 121 is a rod-shaped member having an outer diameter smaller than the outer diameter of the second insertion portion 112.
In this example, for example, a columnar rod-shaped member having a diameter of 30 mm is used.

The support portion 120 is inserted into the pipe of the second buried pipe 20 while being held by the rear end portion 130. That is, the rear end portion 130 supports the tip portion 110 loosely fitted to the end portion 22 from the end portion 21 side via the support portion 120 inserted into the second buried pipe 20.

The rear end portion 130 has a positioning portion 131 that loosely fits into the end portion 21 of the second buried pipe 20, a transmission portion 132 having a diameter larger than that of the second buried pipe 20, and receiving a pressing force from the outside, and a support portion 120. It is provided with a rear end connecting portion 139 for connecting to.

The positioning portion 131 is configured to fit inside the second buried pipe 20. In this example, the positioning portion 131 is loosely fitted to the end portion 21 on the other end side of the second buried pipe 20. The positioning portion 131 is a portion of the rear end portion 130 for being internally fitted into the end portion 21 of the second buried pipe 20.

The positioning portion 131 is formed in a substantially columnar shape so as to be loosely fitted in the second buried pipe 20. That is, the positioning portion 131 is formed in a columnar shape having an outer diameter slightly smaller than the inner diameter of the second buried pipe 20, and is loosely fitted into the pipe of the second buried pipe 20.
The end portion of the positioning portion 131 on the side of the second buried pipe 20 may be chamfered so as to be easily fitted into the second buried pipe 20.

In this example, the positioning portion 131 shares the same axial center P as the axial center direction of the second buried pipe 20, and is configured as a structure protruding into a plurality of columns having different outer diameters. In this example, as a structure having columnar protrusions as the positioning portion 131, the transmission portion 132 is provided with two columnar protrusions 131a and 131b as the positioning portions 131, and functions as one rear end portion 130. Shown.
The thickness of the columnar protrusion 131a and the columnar protrusion 131b is, for example, 4 mm. That is, the depth of the positioning portion 131 (cylindrical protrusions 131a, 131b) to be fitted into the second buried pipe 20 is, for example, 4 mm.

Three or more cylindrically protruding structures that function as the positioning portion 131 may be provided.
For example, the second buried pipe 20 may be provided with four cylindrically protruding structures serving as positioning portions 131, corresponding to the case where the second buried pipe 20 has a nominal diameter of 32A, 50A, 75A, 100A as defined in the JIS standard. .. In this case, the transmission portion 132 is formed to have a diameter larger than that of the second buried pipe 20 having a nominal diameter of 100 A, which is the largest pipe to which the positioning portion 131 is planned to be fitted internally.

That is, the columnar protrusions 131a and 131b are configured to be internally fitted into the second buried pipe 20 having different inner diameters as the positioning portion 131. Specifically, when used for the second buried pipe 20 having a larger diameter, the columnar protrusion 131a is loosely fitted into the second buried pipe 20, and the columnar protrusion 131b is loosely fitted into the second buried pipe 20 having a smaller diameter. Will be loosely fitted. The same applies when the positioning portion 131 includes three or more cylindrical protrusions.

An example of the connection / support relationship between the front end portion 110, the support portion 120, and the rear end portion 130 shown in this example will be supplementarily described.

First, the relationship between the tip portion 110 and the support portion 120 is supplemented.
The tip connection portion 114 of the tip portion 110 is composed of a female screw.
The tip support connection portion 124 of the support portion 120 is composed of a male screw that can be screwed and connected to the tip connection portion 114.
That is, the tip portion 110 is screw-connected by the tip connection portion 114 and the tip support connection portion 124, connected to the support portion 120, and supported by the support portion 120.

The lock nut 125 is a member for regulating the depth at which the tip support connecting portion 124 is screwed and connected to the tip connecting portion 114 when the tip portion 110 is connected to the support portion 120. It also plays a role in reinforcing the strength of the tip connection portion 114. In this example, a nut-shaped member screwed into the tip support connection portion 124 is used. The lock nut 125 is moved back and forth with respect to the tip support connection portion 124, the depth at which the tip support connection portion 124 is screwed with the tip connection portion 114 is adjusted, and the distance between the support portion 120 and the rear end portion 130 is adjusted. , And fix it again. This adjustment / fixing method is a so-called double nut. That is, the lock nut 125 and the tip connecting portion 114 are fixed with a double nut.

Next, the rear end support connection portion 123 of the support portion 120, which supplements the relationship between the support portion 120 and the rear end portion 130, is composed of a female screw.
The rear end connecting portion 139 is composed of a male screw that can be screwed and connected to the rear end support connecting portion 123.
That is, the support portion 120 is screw-connected by the rear end support connection portion 123 and the rear end connection portion 139, connected to the rear end portion 130, and held by the rear end portion 130.
The support portion 120 is supported so as to be on the axis P of the positioning portion 131.

The relationship between the axis P, the tip portion 110, the support portion 120, and the rear end portion 130 will be supplemented.
The axial center P is located at a position passing through the center of the first insertion portion 111 and the second insertion portion 112 of the tip portion 110 and the center of the positioning portion 131 of the rear end portion 130. Further in this example, the axis P is located at a position passing through the center of the support shaft portion 121 and the extension support shaft portion 122 of the support portion 120.

The support portion 120 is supplemented.
In this example, the support portion 120 may function as an integral support portion 120 by connecting one or more extension support shaft portions 122 to the support shaft portion 121. That is, the extension support shaft portion 122 can be connected as needed.

In the support portion 120, when one or more extension support shaft portions 122 are connected to the support shaft portion 121 and function as an integral support portion 120, the extension support shaft portion 122 has the same male screw as the rear end connection portion 139. The extension connecting portion 126 formed of the above and the rear end support connecting portion 123b (123) are provided.

The extension connection portion 126 can be screwed into the rear end support connection portion 123a (123) of the support shaft portion 121 to form an integral support portion 120.
If a plurality of extension support shaft portions 122 having different lengths are prepared and used in appropriate combinations, the support portion 120 can be adjusted to an arbitrary length.
Therefore, the length of the burial aid 100 can be arbitrarily adjusted and used for the second burial pipe 20 having an arbitrary length. For example, when the burial aid 100 is used for the first burial pipe 10 or the second burial pipe 20 of an arbitrary length at a construction site where the replacement process is carried out, the length of the burial aid 100 is arbitrarily adjusted. , It is suitable because the number of members to be prepared at the construction site can be reduced.

The relationship between the burial aid 100 and the second burial pipe 20 and the attachment of the burial aid 100 to the second burial pipe 20 will be supplemented.
The burial aid 100 adjusts the length of the support portion 120 to some extent between the support shaft portion 121 and the extension support shaft portion 122. Further, the position of the tip portion 110 is finely adjusted with the lock nut 125, and the length of the support portion 120 is adjusted to a length suitable for the second buried pipe 20.

Then, the second buried pipe 20 is sandwiched between the front end portion 110 and the rear end portion 130. Then, the front end portion 110 and the rear end portion 130 are connected and supported by the support portion 120, respectively, and the burial auxiliary tool 100 is attached to and fixed to the second burial pipe 20. Then, the pressing force applied to the rear end portion 130 is directly transmitted to the front end portion 110 via the support portion 120.
In this state, the attachment of the burial aid 100 to the second burial pipe 20 is completed.

Subsequently, a description will be added based on a specific example of the construction method of the buried pipe according to the present embodiment when the buried auxiliary tool 100 is used.
For the explanation, FIGS. 1, 2 and 7 to 17 are used.
First, a case where the first buried pipe 10 is not buried in the ground of the ground 30 will be described. That is, a case where a second buried pipe 20 to be a new pipe is laid will be described.

[First Example]
[When laying a new pipe]
A case where the second buried pipe 20 is newly installed in a state where the first buried pipe 10 is not buried will be described.

When the second buried pipe 20 is newly installed, that is, when the first buried pipe 10 is not buried in the ground of the ground 30, the following construction method is used.
A start resistance construction step of constructing a start resistance 40 on one end side of a tubular burial site where the first burial pipe 10 is to be buried, and a reach resistance 50 are constructed on the other end side of the planned burial location. The arrival resistance construction step and the burial step of laying the first burial pipe 10 at the planned burial site from the start resistance 40 by the propulsion method are carried out, and further the replacement step is carried out. In addition, in these series of steps, after carrying out the start anti-construction step, the burial step is carried out, then the reaching anti-construction step is carried out, and then the replacement step is carried out in this order.
Then, after laying the second buried pipe 20, the starting resistance 40 and the reaching resistance 50 are backfilled.
Hereinafter, this first embodiment will be described in detail.

[Situation explanation]
In this example, as a specific example, a case where a second buried pipe 20 is newly laid as a new pipe from the basement of the road side ground 31 to the basement of the sidewalk side ground 32 will be described. This is the state shown in FIG.
In this example, there is a boundary portion 33 provided with a street ditch or a curb at the boundary between the road side ground 31 and the sidewalk side ground 32.
In this example, the width Y of the boundary portion 33 is, for example, 0.70 m.

In this example, if a wide excavation method is used from the basement of the road side ground 31 to the basement (underground) of the sidewalk side ground 32 and the second buried pipe 20 is laid, the street culvert at the boundary 33 or After removing the curb, a large excavation was made from the basement of the road side ground 31 to the basement of the sidewalk side ground 32, a second buried pipe 20 was laid, then the excavated part was backfilled, and the street culvert at the boundary 33 was further excavated. And the curb will need to be restored.
Therefore, a method of widely excavating from the basement of the road side ground 31 to the basement of the sidewalk side ground 32 by the excavation method and laying the second buried pipe 20 is not preferable in this example because it is uneconomical.

Further, in order to maintain the boundary portion 33, a start resistance 40 is tentatively constructed on the road side ground 31, a reach resistance 50 is constructed on the side surface side ground 32, and the boundary portion is constructed from the start resistance 40 to the arrival resistance 50. When a tunnel is formed in the basement of 33 by a carving method and an attempt is made to lay a second buried pipe 20, the ground around the tunnel, that is, the ground under the boundary portion 33, is formed when the tunnel is formed. Even if it collapses and does not collapse, it is inevitable that voids will be created and the ground will soften. Therefore, when using the scooping method, safety risks such as land subsidence are unavoidable.
Therefore, the method of forming a tunnel by the sculpting method and laying the second buried pipe 20 is not preferable in this example because of safety problems.

Therefore, in this example, the laying method for carrying out the following steps including the start anti-construction step, the reach anti-construction step, and the replacement step is selected. More specifically, after the start anti-construction step is carried out, the burial step is carried out, then the reach anti-construction step is carried out, and further the replacement step is carried out. This is because the following construction method is economical because it is not necessary to restore the culvert and curb at the boundary 33, and there is no safety risk such as land subsidence.

[Starting resistance construction process]
7 and 8 show the construction process of the start resistance 40 in this start resistance construction process. FIG. 7 shows the state before the start resistance 40 is constructed, and FIG. 8 shows the state after the start resistance 40 is built.
The start anti-construction step of constructing the start anti 40 on the road side ground 31 is carried out. In order to construct the starting resistance 40 without affecting the boundary portion 33, the starting resistance 40 is constructed at a distance E from the boundary portion 33. When the depth of the starting resistance 40 is about 1 m, the distance E is, for example, 0.30 m.

[Buried process]
After carrying out the start-up resistance construction step, a burial step is carried out in which the first burial pipe 10 is laid at a predetermined position from the start-up resistance 40 by the propulsion method. Here, the predetermined position is a place where the second buried pipe 20 is to be buried and laid. 9 and 10 show the burial process.
The propulsion method referred to in this example is a non-excavation method in which the first buried pipe 10 is buried without excavating the entire ground 30 through a pipe through a hole excavated in a tunnel shape in the ground. For example, a so-called small diameter pipe propulsion method can be used. Further, among the small-diameter pipe propulsion methods, a press-fitting method, an auger method, a muddy water method, a muddy soil pressure method, a boring method and the like can be used. In this example, the case of the press-fitting method will be described below.

The burial process will be described in detail.
In the burying process shown in this example, the first burial pipe 10 is pressed from the starting resistance 40 toward a predetermined position by the pressing force generating portion 91, and the first burial pipe 10 is propelled and buried under the boundary portion 33. I will do it. Here, the predetermined position is a tubular burial place where the first burial pipe 10 is buried, and a burial place where the second burial pipe 20 is buried.
FIG. 9 shows the state of the first buried pipe 10 at the time of burying.

When the first buried pipe 10 is propelled underground of the boundary portion 33 toward a predetermined position, the first buried pipe 10 itself forms a hole excavated in a tunnel shape in the ground, so that the ground including the boundary portion 33 is included. The first buried pipe 10 can be buried without excavating the entire 30.

When the first buried pipe 10 is propelled toward a predetermined position, the excavated earth and sand penetrate into the pipe of the first buried pipe 10.
The earth and sand that has entered the pipe of the first buried pipe 10 does not have to be removed from the pipe of the first buried pipe 10 during burying the first buried pipe 10, and if it is necessary to remove it, it is necessary. May be removed. For example, water can be passed through the first buried pipe 10 from the starting resistance 40 side to wash away the earth and sand.

Here, the pressing force generating unit 91 is a device or the like that presses the first buried pipe 10 toward a predetermined position, and in this example, an example using a so-called earth retaining hydraulic jack is shown. As long as the pressing force generating unit 91 has the same pressing function, it can be used without any special restrictions.
If the first buried pipe 10 is laid at a predetermined position, the burying process is completed.
FIG. 10 shows the state of the first buried pipe 10 after burying.

[Achievement resistance construction process]
Next, the reaching resistance construction step of constructing the reaching resistance 50 on the sidewalk side ground 32 is carried out.
FIG. 11 shows a state in which the reaching resistance 50 is constructed by carrying out the reaching resistance building step.
In the reaching resistance construction step, in order to construct the reaching resistance 50 without affecting the boundary portion 33, the reaching resistance 50 is constructed at a distance E from the boundary portion 33 as shown in FIGS. 7 and 11. To. When the depth of the reaching resistance 50 is about 1 m, the distance E is, for example, 0.30 m.
That is, the starting resistance 40 and the reaching resistance 50 are constructed at a distance of about 1.30 m in this example. Therefore, as the first buried pipe 10, a steel pipe having a length of about 1.50 m is selected. Further, as the second buried pipe 20, a polyethylene pipe having the same length as the first buried pipe 10 and having a length of about 1.50 m is selected.

The reach anti-construction process will be described in detail.
Since the reaching resistance construction step is carried out after the burial step, the wall portion 52 of the reaching resistance 50 is spared from collapse or collapse.
If the burial process is carried out after the reaching resistance 50 is constructed, when one end of the first buried pipe 10 reaches the reaching resistance 50, the wall portion 52 collapses or collapses due to the stress propelling the first buried pipe 10. Is inevitable.
However, if the reach resistance 50 is constructed after the burial step of laying the first burial pipe 10 in place, the wall portion 52 is spared the opportunity to be stressed to propel the first burial pipe 10. Therefore, the wall portion 52 is spared from collapse and collapse.

[Replacement process]
FIG. 12 shows the replacement step. Next, a replacement step of replacing the first buried pipe 10 is carried out in the second buried pipe 20 to which the buried auxiliary tool 100 is attached.

The replacement step will be described in detail with reference to FIGS. 1, 2, and 12.
In the replacement step, first, as shown in FIG. 2, the burial aid 100 is attached to the second burial pipe 20.
Then, the transmission unit 132 of the burial aid 100 attached to the second burial pipe 20 is pressed from the outside by the pressing force generating portion 91, and the first burial pipe 10 is pressed by the burial aid 100. , While pushing out the first buried pipe 10 to the reaching resistance 50, the second buried pipe 20 is pushed together with the burying auxiliary tool 100 to the position where the first buried pipe 10 was present, and the first buried pipe 10 is pushed into the first buried pipe 10. (Ii) Replace with the buried pipe 20.

That is, in the replacement step, the rear end portion 130 is pressed from the outside, and the end portion 11 on the start-up resistance 40 side of the first buried pipe 10 is pressed via the pressing portion 113 of the support portion 120 and the tip portion 110.

In the replacement step, the first insertion portion 111 of the embedding auxiliary tool 100 is in a state of being loosely fitted to the first embedding pipe 10, and the pressing portion 113 presses the end portion 11 on the starting counter side.
At this time, by fitting the first insertion portion 111 into the first buried pipe 10, the axes of the second buried pipe 20 and the burying auxiliary tool 100 are aligned with the axis P of the first buried pipe 10. Then, when the embedding auxiliary tool 100 is pressed straight by the pressing force generating portion 91 toward the reaching resistance 50 in the axial direction of the axial center P, the first buried pipe 10 is smoothly pressed by the second buried pipe 20. Can be replaced.

When the replacement of the first buried pipe 10 with the second buried pipe 20 is completed, the buried auxiliary tool 100 is removed from the second buried pipe 20.
At this stage, the burial of the second burial pipe 20 is completed. FIG. 13 illustrates the state at the time when the replacement step is completed and the burying of the second burial pipe 20 is completed.

Supplementary information on the replacement process.
Although not shown, the second buried pipe 20 is usually connected to another buried pipe when the replacement step is completed. The connection may be made by a commonly used method.
Then, if the starting resistance 40 and the reaching resistance 50 are backfilled, the laying of the second buried pipe 20 is completed. Illustration of this state is omitted.

[Second Example of Reference of the Present Invention ]
[When replacing an existing pipe with a new pipe]
A case where the first buried pipe 10 is replaced with the second buried pipe 20 while the first buried pipe 10 is buried will be described.

That is, a case where the first buried pipe 10 is buried in the ground of the ground 30 as an existing pipe will be described. That is, it is a case where the existing pipe is replaced with the second buried pipe 20 which is a new pipe.

When the first buried pipe 10 is buried in the ground of the ground 30 in advance, the start-to-reach step and the reach-to-reach step are carried out, and then the replacement step is carried out to lay the second buried pipe 20. , Backfill the start resistance 40 and the arrival resistance 50. Hereinafter, the differences between the second embodiment and the first embodiment will be described.

When an existing pipe that can be the first buried pipe 10 is buried in the ground of the ground 30 in advance, either the start-to-reach step or the reach-to-reach step may be performed first.

Then, after carrying out the start-to-reach step and the reach-to-reach step to construct the start-to-reach 40 and the reach-to-reach 50, the side of the start-to-reach 40 of the existing pipe previously buried in the ground 30 It is necessary to cut the side of the reaching resistance 50 and cut out the first buried pipe 10 to be replaced by the second buried pipe 20. At this stage, the state shown in FIG. 11 is reached.
After that, the replacement step may be carried out in the same manner as in the first embodiment.

[Third Example of Reference of the Present Invention ]
[When removing old pipes]
A case where the first buried pipe 10 is removed while the first buried pipe 10 is buried will be described.

That is, a case of removing the first buried pipe 10 previously buried in the ground 30 will be described. That is, a case where the first buried pipe 10 which has become an old pipe is removed and the place (position) where the first buried pipe 10 was present is backfilled will be described.

When the aged first buried pipe 10 is buried in the ground 30 in advance, the start-to-reach step and the reach-to-reach step are carried out, and then the replacement step is carried out to provide the first buried pipe 10. After removing and laying the second buried pipe 20, the removal process of removing the second buried pipe 20 is carried out, and then the starting resistance 40 and the reaching resistance 50 are backfilled, so that the first buried pipe 10 can be removed. Complete. Hereinafter, the differences between the third embodiment and the second embodiment will be described.

This example is the same as the second embodiment up to the point where the replacement step is carried out.
Hereinafter, the removal step of removing the second buried pipe 20 will be further described. The removal step is a step of removing the second buried pipe 20 and backfilling the position where the second buried pipe 20 existed.

[Removal process]
14, FIG. 15, FIG. 16, and FIG. 17 show a removal step of removing the second buried pipe 20.
In the removal step, the second buried pipe 20 is slightly pulled out to the side of the starting resistance 40, and the open end 62 on the side of the reaching resistance 50 of the space 61 created by pulling out the second buried pipe 20 is pulled out of the reaching resistance 50. A sealing step of sealing from the side is carried out, and then, while further pulling out the second buried pipe 20, the filler 64 is filled in the space 61 via the end portion 22 on the side of the reaching resistance 50 of the second buried pipe 20. This is a step of sealing and removing the second buried pipe 20. The sealing step is a step included in the removing step.

The removal process will be described in detail.
In this removal step, first, the start resistance 40 and the arrival resistance 50 are constructed.
Then, a sealing step of sealing the space 61 in which the second buried pipe 20 was present is carried out.
That is, the second buried pipe 20 is slightly pulled out to the starting resistance 40. Then, the open end 62 on the side of the reaching resistance 50 of the space 61 created by the second buried pipe 20 being pulled out toward the starting resistance 40 is sealed from the side of the reaching resistance 50. The open end 62 is sealed and closed. FIG. 14 shows a state at the time when the open end 62 is sealed at the start of this sealing step.

After that, while further pulling out the second buried pipe 20 to the starting resistance 40, the filler 64 is sealed in the space 61 with the tube 65 via the end portion 22 on the side opposite to the arrival of the second buried pipe 20, and the space 61 is filled. Will be sealed.
At the stage where the drawing of the second buried pipe 20 is completed (the stage where the second buried pipe 20 is removed from the starting resistance 40 side), the space 61 is filled with the filler 64. That is, the sealing of the space 61 is completed. FIG. 15 shows a state immediately before the completion of this sealing step. This completes the sealing process.

In this example, as the filler 64, what is generally known as an underground encapsulant, an encapsulant, or a filler, such as cement or earth and sand pulverized into a slurry, can be used. The filler 64 has good fluidity and can fill the space 61 without gaps, and preferably does not reduce the volume after filling, or even if the volume is reduced, the volume is very small. This is because when the volume of the filler 64 is reduced, a space is generated, which causes land subsidence.

Supplement the removal process.
When removing the first buried pipe 10 that has become an aged pipe, earth and sand stick to the surface of the first buried pipe 10 and the surface rusts, increasing friction with the ground, for example, pulling out smoothly by hand. It may not be possible. However, once the first buried pipe 10 is replaced with the second buried pipe 20, no earth and sand sticks to the second buried pipe 20 or rust is generated, and the second buried pipe 20 has friction with the ground. Since it is in a small state, the second buried pipe 20 can be smoothly pulled out by hand, for example. Therefore, the sealing process can be easily performed.

When the sealing step is complete, the space 61 is filled with the filler 64. FIG. 16 shows a state at the end of this sealing step.
After that, the starting resistance 40 and the reaching resistance 50 are backfilled with earth and sand 41 and 51.
This completes the removal process for removing the second buried pipe 20. FIG. 17 shows a state at the time of completion of this removal step.

As described above, when the second buried pipe 20 is newly laid, it is economical without excavating the ground 30 widely, avoiding the collapse of the underground ground of the ground 30, and damaging the second buried pipe 20. It is possible to provide a construction method of the second buried pipe 20 that can be suppressed and a burial auxiliary tool 100 of the second buried pipe 20 used in the construction method.

[Another Embodiment]
(1) In the above embodiment, after the start resistance construction step is carried out to construct the start resistance 40, a burial step of laying the first burial pipe 10 at a predetermined position from the start resistance 40 by the propulsion method is carried out, and then the start resistance 40 is laid. The case where the reaching resistance construction step of constructing the reaching resistance 50 is carried out, and further the replacement step of replacing the first buried pipe 10 with the second buried pipe 20 to which the burial aid 100 is attached is shown.

However, after the start resistance construction step is carried out to construct the start resistance 40, the arrival resistance construction process for constructing the arrival resistance 50 is carried out, and the first buried pipe 10 is laid at a predetermined position from the start resistance 40 by the propulsion method. The burial step may be carried out, and then a replacement step of replacing the first burial pipe 10 with the second burial pipe 20 to which the burial aid 100 is attached may be carried out. For example, if the underground ground of the ground 30 is sufficiently strong, it may not be necessary to consider the collapse or collapse of the wall portion 52.
In this way, when the underground ground of the ground 30 is sufficiently strong and it is not necessary to consider the collapse or collapse of the wall portion 52, it is better to construct the start resistance 40 and the arrival resistance 50 first. It can be easier.

(2) In the above embodiment, the burying auxiliary tool 100 is attached to the tip portion 110 attached to the end portion 22 on one end side of the second buried pipe 20 and the end portion 21 on the other end side of the second buried pipe 20. The rear end portion 130 is provided with a support portion 120 that is inserted into the second buried pipe 20 to support the tip portion 110 and the rear end portion 130, and the tip portion 110 is the starting opposite side of the first buried pipe 10. The first insertion portion 111 that loosely fits into the end portion 11 and the second insertion portion 112 that loosely fits into the end portion 22 on the side facing the first buried pipe 10 which is one end side of the second buried pipe 20. A pressing portion 113 provided between the first insertion portion 111 and the second insertion portion 112 to press the end portion 11 on the starting side of the first buried pipe 10 is provided, and the rear end portion 130 is a second. (Ii) A positioning unit 131 that loosely fits into the end 21 of the buried pipe 20, a transmission unit 132 that has a diameter larger than that of the second buried pipe 20 and receives pressing force from the outside, and a rear end connecting portion that connects to the support 120. The case where 139 is provided is shown.

However, the burial aid 100 has a tip portion 110 attached to the end portion 22 on one end side of the second buried pipe 20 and a rear end portion 130 attached to the end portion 21 on the other end side of the second buried pipe 20. The tip portion 110 faces the first insertion portion 111 that loosely fits into the start-opposite end portion 11 of the first buried pipe 10 and the first buried pipe 10 that is one end side of the second buried pipe 20. A second insertion portion 112 that is loosely fitted to the end portion 22 on the side to be loosely fitted, and an end portion 11 on the starting side of the first buried pipe 10 that is provided between the first insertion portion 111 and the second insertion portion 112. The rear end portion 130 includes a pressing portion 113 for pressing, and the rear end portion 130 has a positioning portion 131 that loosely fits into the end portion 21 of the second buried pipe 20 and a diameter larger than that of the second buried pipe 20, and exerts a pressing force from the outside. It may be configured to include a receiving transmission unit 132.
That is, the burial aid 100 may not include the support portion 120.

The burial aid 100, which is composed of a front end portion 110 and a rear end portion 130 and does not have a support portion 120, can be used, for example, when the second burial pipe 20 is a steel pipe and has sufficient rigidity.

(3) In the above embodiment, as a removal step for removing the second buried pipe 20, the second buried pipe 20 is slightly pulled out toward the starting resistance 40, and the space 61 created by pulling out the second buried pipe 20. A sealing step of sealing the open end 62 on the side of the reaching resistance 50 from the side of the reaching resistance 50 is performed, and then the second buried pipe 20 reaches the space 61 while further pulling out the second buried pipe 20. The case where the filler 64 is sealed through the end portion 22 on the opposite side is shown.

However, as a removal step for removing the second buried pipe 20, the second buried pipe 20 is slightly pulled out to the side of the reaching resistance 50, and the space 61 created by pulling out the second buried pipe 20 is on the side of the starting resistance 40. A sealing step of sealing the open end 62 from the side of the reaching resistance 50 is performed, and then, while further pulling out the second buried pipe 20, the end of the second buried pipe 20 on the side of the starting resistance 40 is inserted into the space 61. The filler 64 may be sealed through the portion 21.

(4) In the above embodiment, the connection between the support portion 120 and the rear end portion 130 is a case where the rear end support connection portion 123 of the support portion 120 and the rear end connection portion 139 of the rear end portion 130 are screwed together. showed that.

However, the support portion 120 and the rear end portion 130 may be connected by welding the support portion 120 and the rear end portion 130. In this case, the support portion 120 and the rear end portion 130 are integrated members, but the method of use when used as the burying auxiliary tool 100 is the same as in the above-described embodiment. In addition to screw connection and weld connection, other general connection methods such as fitting and joint connection can also be used.

(5) In the above embodiment, the case where the second buried pipe 20 is newly installed in the state where the first buried pipe 10 is not buried is the case where the first buried pipe 10 is not buried in advance in the ground 30. Therefore, the start anti-arrival process was carried out, the burial process was carried out, the reach anti-construction process was carried out, and the replacement step was further carried out to lay the second buried pipe 20 having the same pipe diameter as the first buried pipe 10. Later, the case where the starting resistance 40 and the reaching resistance 50 are backfilled is shown.

However, even when the third buried pipe (not shown) is buried in the ground of the ground 30 in advance and the third buried pipe is sufficiently thinner than the inner diameter of the second buried pipe 20. The second buried pipe 20 can be laid in the same manner as when a new pipe is laid.
That is, when carrying out the burying step of burying the first buried pipe 10, the first buried pipe 10 is propelled in such a manner that the third buried pipe is inserted inside the first buried pipe 10. After that, the first buried pipe 10 including the third buried pipe may be replaced with the second buried pipe 20 in the replacement step.

(6) In the above embodiment, when the tip support connecting portion 124 is screwed and connected to the tip connecting portion 114, the lock nut 125 and the tip connecting portion 114 are fixed with a double nut.
However, the tip support connecting portion 124 may be connected to and fixed to the tip connecting portion 114 only by a screw connection. For example, when the pipe diameter of the second buried pipe 20 is small, the tip support connection portion 124 is connected to the tip connection portion 114 only by screw connection, and the lock nut 125 is not used. It is possible to provide a burial aid 100 that can be made compact and can be used for a second burial pipe 20 having a small diameter.

The configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in the present specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

The present invention is a construction method and a construction method of a buried pipe in which a second buried pipe is laid by replacing a first buried pipe previously buried with a second buried pipe having the same diameter as the first buried pipe. It can be used as a burial aid for burial pipes used in.

10: First buried pipe 11: End (one end of the first buried pipe)
12: End (the other end of the first buried pipe)
20: Second buried pipe 21: End (the other end of the second buried pipe)
22: End (one end of the second buried pipe)
30: Ground 40: Starting resistance 50: Reaching resistance 61: Space 62: Open end 64: Filler 100: Buried aid 110: Tip part 111: First insertion part 112: Second insertion part 113: Pressing part 120: Support Part 130: Rear end part 131: Positioning part 131a: Columnar protrusion 131b: Columnar protrusion 132: Transmission part P: Axis center

Claims (7)

When the second buried pipe is newly installed when the first buried pipe is not buried, a starting resistance is constructed on one end side of the tubular burial site where the first buried pipe is buried. The construction step, the reach resistance construction step of constructing the reach resistance on the other end side of the planned burial site, and the burial step of laying the first burial pipe at the planned burial site by the propulsion method from the start resistance. conducted, further, the first buried pipe is embedded, the second by pressing with embedded aid mounted on buried pipe, one starting anti side constructed on the end side of said first buried pipe A method for constructing a buried pipe, in which a replacement step is carried out in which the first buried pipe is replaced with the second buried pipe by pushing out from the first buried pipe to the reaching side constructed on the other end side of the first buried pipe. Wherein the starting anti-constructing step after carrying, and carrying out the embedding step, then construction construction method of underground pipes according to claim 1, wherein performing the reaching anti constructing step further carrying out the substitution process. The burial aid is inserted into the second burial pipe, the tip portion mounted on one end side of the second burial pipe, the rear end portion mounted on the other end side of the second burial pipe, and the second burial pipe. A support portion for supporting the front end portion and the rear end portion is provided.
The tip portion includes a first insertion portion that loosely fits into the start-reverse end portion of the first buried pipe, and an end portion that is one end side of the second buried pipe and that faces the first buried pipe. A second insertion portion that is loosely fitted into the pipe, and a pressing portion that is provided between the first insertion portion and the second insertion portion and presses the end of the first embedded pipe on the starting edge side. Prepare,
In claim 1 or 2, in the replacement step, the rear end portion is pressed from the outside, and the start-opposite end portion of the first buried pipe is pressed via the support portion and the pressing portion of the tip portion. The described buried pipe construction method. A burial aid used in the burial pipe construction method according to any one of claims 1 to 3.
A tip portion mounted on one end side of the second buried pipe, a rear end portion mounted on the other end side of the second buried pipe, and the tip portion and the rear end mounted in the second buried pipe. With a support part to support the part,
The tip portion includes a first insertion portion that loosely fits into the start-reverse end portion of the first buried pipe, and an end portion that is one end side of the second buried pipe and that faces the first buried pipe. A second insertion portion that is loosely fitted to the pipe, and a pressing portion that is provided between the first insertion portion and the second insertion portion and presses the end of the first buried pipe on the starting edge side. Buried aid for buried pipes. The rear end portion includes a positioning portion that is loosely fitted to the other end side of the second buried pipe, and a transmission portion that has a diameter larger than that of the second buried pipe and receives a pressing force from the outside. Item 4. The burial aid for the burial pipe according to item 4. The burying auxiliary tool for a burying pipe according to claim 5, wherein the positioning portion is formed of a plurality of columnar protrusions having the same axis and different outer diameters . The first buried pipe to be buried is pressed by the burying auxiliary tool attached to the second buried pipe, and the first buried pipe is formed from the starting counter side constructed on one end side of the first buried pipe. A replacement step was carried out in which the first buried pipe was replaced with the second buried pipe by pushing out to the reaching side constructed on the other end side.
The burial aid is inserted into the second burial pipe, the tip portion mounted on one end side of the second burial pipe, the rear end portion mounted on the other end side of the second burial pipe, and the second burial pipe. A support portion for supporting the front end portion and the rear end portion is provided.
The tip portion includes a first insertion portion that loosely fits into the start-reverse end portion of the first buried pipe, and an end portion that is one end side of the second buried pipe and that faces the first buried pipe. A second insertion portion that is loosely fitted into the pipe, and a pressing portion that is provided between the first insertion portion and the second insertion portion and presses the end of the first embedded pipe on the starting edge side. Prepare,
In the replacement step, a method of constructing a buried pipe in which the rear end portion is pressed from the outside and the end portion on the starting opposite side of the first buried pipe is pressed via the supporting portion and the pressing portion of the tip portion .

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