JP2018040113A - Construction method of underground pipe and embedding auxiliary tool of used in the construction method of the underground pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of an underground pipe capable of installing an underground pipe at a low cost without widely cutting the ground while avoiding collapse of the ground and preventing from giving any damages on the underground pipe, and an embedding auxiliary tool of an underground pipe used in the construction method.SOLUTION: The construction method of an underground pipe includes a replacement step in which an embedded first underground pipe 10 is pushed out by an embedding auxiliary tool 100 attached to a second underground pipe 20 toward a reaching pit 50 which is formed in the ground at the one side of the first underground pipe 10 from a starting pit 40 which is formed at the other end side of the first underground pipe 10 to thereby replace the first underground pipe 10 with a second underground pipe 20.SELECTED DRAWING: Figure 1

Description

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

  When underground pipes such as gas pipes are laid and laid in public land such as under roads, the open-cut method is uneconomical because it takes a large open-cut area, and there is a range of traffic obstruction and construction pollution. There was a problem of expanding. Therefore, a construction method for a buried pipe that appropriately lays a buried pipe while reducing the excavation range is desired.

As a construction method for a buried pipe that appropriately lays a buried pipe in the ground while reducing the excavation range, for example, a propulsion method described in Patent Document 1 is known.
This propulsion method does not open the ground widely and lay buried pipes in the ground, but constructs a start-up resistance and an arrival resistance, and drills a hole in the ground from the start-up resistance to the arrival resistance. This is a method of laying buried pipes by pushing the buried pipes.
However, this method may cause a problem that the wall or ground of the anti-corruption partly collapses when the buried pipe is pushed in while drilling a hole in the ground from the starting anti-resistance to the ultimate anti-resistance. Become. This is because when the buried pipe reaches the ultimate resistance by the propulsion method, the wall of the ultimate resistance is destroyed so as to break from the underground side. In such a case, for example, if the ground collapses under the road, it becomes necessary to excavate and repair the road above the collapsed part due to safety problems and legal restrictions.

As another example of the construction method of the buried pipe that appropriately lays the buried pipe in the ground while reducing the excavation range, for example, a buried pipe replacement method as disclosed in Patent Document 2 is known. .
The buried pipe construction method disclosed in Patent Document 2 is a so-called punching method. That is, when the old pipe is buried in advance, the new pipe is pushed out from the starting side, while the old pipe is pushed in, while the old pipe is pulled out from the destination side, so that the new pipe can be laid without cutting. is there.
The buried pipe construction method using the punching method is preferable in that the ground on the ultimate side is not easily collapsed. However, there are cases where new pipes are easily damaged, which is a problem. This is because excessive stress is applied to the new pipe when the old pipe is pushed directly into the new pipe.

Japanese Patent Laid-Open No. 6-248876 JP 2001-27093 A

  As described above, when laying buried pipes, it is desirable to realize a construction method for buried pipes that is efficient without digging the ground widely, avoids ground collapse, and can suppress damage to the buried pipes. .

  The present invention has been made in view of such a situation, and the purpose thereof is to economically avoid digging the ground widely when laying a buried pipe, avoiding the collapse of the ground, and damaging the buried pipe. An object of the present invention is to provide a buried pipe construction method and a buried pipe burial auxiliary tool used in the construction method.

The construction method of the buried pipe according to the present invention for achieving the above object is as follows:
The first buried pipe that is buried is pressed by a buried auxiliary tool attached to the second buried pipe, and the first buried pipe of the first buried pipe is constructed from the starting side constructed on one end side of the first buried pipe. The point is that a replacement step is performed in which the first buried pipe is replaced with the second buried pipe by being pushed out to the arrival resistance side constructed on the other end side.

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 from the start resistance side to the arrival resistance side by a so-called push-out method. The second buried pipe is laid at the position where the first buried pipe was present by punching.
In this case, if the starting resistance is constructed on one end side of the first buried pipe and the arrival resistance is constructed on the other end side of the first buried pipe, the location where the first buried pipe is buried ( Since the second buried pipe can be laid by performing the replacement process without excavating the ground on the upper side of the second buried pipe), the excavation range can be narrowed and it is economical.

  In addition, since the first buried pipe that has been buried is only pressed from the start side end of the first buried pipe with the buried auxiliary tool attached to the second buried pipe and pushed out to the arrival side, By avoiding applying stress to the ground or the like, it is possible to avoid the collapse of the ground or the like when the second buried pipe is laid.

  In addition, 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 are not in direct contact with each other. Therefore, damage such as deformation of the second buried pipe can be avoided. Furthermore, it is possible to avoid the second buried pipe from being deformed and applying stress to the surrounding ground or the like. 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 digging the ground widely, avoiding the collapse of the surrounding ground where the second buried pipe is buried, and suppressing the breakage of the second buried pipe. A construction method for buried pipes can be provided.
Also, according to this construction method, for example, when the first buried pipe is a hard metal pipe, the second buried pipe is newly installed by replacing the first buried pipe with a relatively soft second buried pipe made of resin. It is also possible to do.

Further characteristic composition of the construction method of the buried pipe according to the present invention is
A start-up construction step for building up the start-up resistance on one end side in the cylindrical burying planned place where the first burying pipe is buried, and the reach resistance on the other end side in the planned burying place The reaching resistance building process and the embedding process of laying the first buried pipe at the planned embedding position by the propulsion method from the starting resistance, and the replacement process are further performed.

According to the above configuration, even when the first buried pipe is not buried, a burying step for laying the first buried pipe, and a replacement process for replacing the buried first buried pipe with the second buried pipe. By carrying out the above, it is possible to provide a construction method for a buried pipe that is economical without widely excavating the ground, can avoid the collapse of the ground, and can suppress the breakage of the buried pipe.
That is, when there is no buried first buried pipe, a starting anti-building process for constructing a starting resistance on one end side in the cylindrical burying planned place where the first buried pipe is buried, and the buried If the ultimate resistance construction process for constructing the ultimate resistance at the other end side in the planned location is carried out, and further, if the first buried pipe is laid in the planned buried location, then the replacement process is performed. By carrying out, a second buried pipe can be newly laid.

  In the burial process of burying the first buried pipe, the first buried pipe is propelled by the propulsion method from the start-up, and the cylindrical buried planned place where the first buried pipe is buried (the second buried pipe is buried) Laying in the planned burial location). In this way, since the propulsion method is used in the burying process, when laying the first buried pipe, the ground on the upper side of the cylindrical burying planned place where the first buried pipe is 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 digging the ground widely and avoiding the collapse of the surrounding ground where the second buried pipe is buried And the construction method of the buried pipe which can suppress the failure | damage of a 2nd buried pipe can be provided.
Moreover, 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 buried directly by the propulsion method, 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. Therefore, the second buried pipe can be newly laid by replacing the first buried pipe with the second buried pipe.

Further characteristic composition of the construction method of the buried pipe according to the present invention is
After performing the starting anti-construction step, the embedding step is performed, then the ultimate anti-construction step is performed, and further the replacement step is performed.

According to the above configuration, when it is desired to newly lay the second buried pipe, which is a newly installed pipe, first the start-up resistance is constructed, and then the burial process of laying the first buried pipe is performed before the ultimate resistance is constructed. Will do.
Therefore, since there is no reaching resistance in the burying process, there is no wall that collapses on the front side of the first buried pipe in the propulsion direction of the first buried pipe. Therefore, when the first buried pipe is buried, it is possible to reliably avoid the collapse of the ground or the like. If the reaching resistance is constructed after burying the first buried pipe, the second buried pipe can be laid by performing a replacement process thereafter.

  Therefore, when the second buried pipe is laid as a new pipe when the first buried pipe is not buried, it is economical without digging the ground widely and ensuring the collapse of the surrounding ground where the second buried pipe is buried 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
A start-up construction step for constructing the start-up resistance on one end side of the first buried pipe that is buried, and an arrival-resistance construction step for constructing the reach resistance on the other end side of the first buried pipe And the replacement step is further performed.

According to the above configuration, when the first buried pipe is already buried, the replacement process can be performed by constructing the starting resistance and the reaching resistance.
When there is a buried first buried pipe, for example, when the second buried pipe as a new installed pipe is laid in a form that replaces the already buried first buried pipe, The construction method of the buried pipe which does not need to excavate the ground widely can be provided.

Further characteristic composition of the construction method of the buried pipe according to the present invention is
After performing the replacement step,
Performing a sealing step of slightly pulling out the second buried pipe to the starting resistance side and sealing the open end on the arrival resistance side of the space formed by drawing out the second buried pipe from the arrival resistance side. ,after that,
While pulling out the second buried pipe further, the space is filled with a filler via the arrival resistance side end of the second buried pipe, and the second buried pipe is removed from the starting resistance side. is there.

According to the above configuration, first, a replacement step of replacing the buried first buried pipe with the second buried pipe is performed, the first buried pipe is removed from the arrival resistance side, The buried pipe is buried. In this state, the second buried pipe is slightly pulled out to the starting resistance side by the sealing step, and the open end on the arrival resistance side of the space generated thereby is closed. Therefore, in the sealing step, if the filler is supplied to the space generated by pulling out the second buried pipe from the starting side through the second buried pipe and the reaching side end of the second buried pipe, The space can be reliably filled with the filler. This is because the filler does not flow out from the open end on the ultimate side.
In addition, since the filler is supplied to the space that sequentially expands while the second buried pipe is further pulled out to the starting side, the space can be reliably filled with the filler, and the wall surface forming the space can be prevented from collapsing. can do.
That is, when removing the first buried pipe, it is possible to prevent the occurrence of a failure such as a depression by filling the portion where the first buried pipe was present economically without digging the ground widely. The construction method of the buried pipe for removing the first buried pipe can be provided.

Further characteristic composition of the construction method of the buried pipe according to the present invention is
The embedding auxiliary tool is inserted into the second embedded tube by inserting a tip end portion attached to one end side of the second embedded tube, a rear end portion mounted on the other end side of the second embedded tube, and the second embedded tube. A front end portion and a support portion for supporting the rear end portion,
The tip portion includes a first insertion portion that is loosely fitted to the start-side end portion of the first embedded tube, and an end portion that faces the first embedded tube that is one end side of the second embedded tube. A second insertion part that is loosely fitted to the first insertion part, and a pressing part that is provided between the first insertion part and the second insertion part and that presses the end of the first buried pipe on the start-up side. Prepared,
In the replacement step, the rear end portion is pressed from the outside, and the start-side end portion of the first buried pipe is pressed through the support portion and the pressing portion of the tip portion.

In addition, the characteristic configuration of the buried auxiliary tool for the buried pipe used in the construction method of the buried pipe according to the present invention is as follows:
A distal end portion mounted on one end side of the second embedded tube, a rear end portion mounted on the other end side of the second embedded tube, and the distal end portion and the rear end inserted into the second embedded tube A support part for supporting the part,
The tip portion includes a first insertion portion that is loosely fitted to the start-side end portion of the first embedded tube, and an end portion that faces the first embedded tube that is one end side of the second embedded tube. A second insertion part that is loosely fitted to the first insertion part, and a pressing part that is provided between the first insertion part and the second insertion part and that presses the end of the first buried pipe on the start-up side. It is in the point to have.

According to the above configuration, when the first buried pipe is pressed with the burial auxiliary tool attached to the second buried pipe and the first buried pipe is pushed out from the starting resistance side toward the arrival resistance side, The first insertion portion at the distal end portion of the burying aid is loosely fitted to the end of the first burying tube, and the second insertion portion is the side facing the first burying tube, which is one end of the second burying tube. In addition, the pressing portion presses the end portion on the start-up side of the first buried pipe.
When the first embedded tube is pressed and pulled out with the tip portion loosely fitted to the first embedded tube and the second embedded tube, the first embedded tube and the second embedded tube are embedded It will be in the state which mutually restrained via the front-end | tip part of an auxiliary tool. Moreover, the axial center of a 1st buried pipe and the axial center of a 2nd buried pipe exist on the same axial center.
When 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 with the second buried pipe equipped with a buried auxiliary tool The first buried pipe and the second buried pipe are pushed out straight and surely along the axial direction of the second buried pipe toward the arrival resistance side without causing the core blurring. be able to.

Moreover, since the pressing part which presses the edge part by the side of the start of a 1st buried pipe is provided between the 1st insertion part and the 2nd insertion part, the 2nd buried pipe is directly in the 1st buried pipe Do not touch. Therefore, it can avoid that a 2nd buried pipe contacts with a 1st buried pipe, and is damaged.
And since the front-end | tip part provided with a press part is supported by the rear-end part via the support part inserted in the 2nd buried pipe, the front-end | tip part receives the pressing force given to the rear-end part from the outside. Thus, 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 through the support portion of the buried auxiliary tool and the pressing portion of the front end portion. The first buried pipe is replaced with the second buried pipe by pressing the end of the buried pipe on the starting side.

  That is, the stress which presses a 1st embedding pipe is given to an embedding auxiliary tool from the outside. And an embedding auxiliary tool makes it the pressing force which presses the 1st embedding pipe via the press part of a front-end | tip part, without transmitting the given stress to a 2nd embedding pipe. Therefore, it is possible to avoid the second buried pipe from being damaged by the stress applied from the outside.

  That is, the distal end portion of the embedding auxiliary tool is attached to an end portion on one end side (side facing the first embedding tube) of the second embedding tube. Then, the burial auxiliary tool transmits the pressing force applied at the rear end directly as a pressing force from the tip to the start counter side end of the first burying pipe without applying stress to the second burying pipe. To do. For this reason, the second buried pipe with the buried auxiliary tool is protected by the buried auxiliary tool. Therefore, the first buried pipe can be pressed and punched out without damaging the second buried pipe. In addition, even when the second embedded pipe is softer or more fragile than the first embedded pipe, the first embedded pipe can be pressed to push out the first embedded pipe.

The characteristic configuration of the buried auxiliary tool for the buried pipe used in the construction method of the buried pipe according to the present invention is as follows:
The rear end portion includes a positioning portion that is loosely fitted to the other end side of the second embedded tube, and a transmission portion that is larger in diameter than the second embedded tube and receives a pressing force from the outside. It is in.

According to the said structure, the rear-end part of a buried auxiliary tool is loosely fitted by the positioning part to the other end side of a 2nd buried pipe.
That is, the second embedded tube is in a state where the second insertion portion at the front end is loosely fitted on one end side and the positioning portion at the rear end is loosely fitted on the other end side. And since the front-end | tip part of an embedding auxiliary tool is supported by the rear-end part via the support part inserted in the 2nd embedding pipe, the 2nd embedding pipe is connected with the front-end | tip part connected via a support part, and back. It becomes a state restrained by the end.
Therefore, when the first buried pipe is pressed and pulled out with the second buried pipe equipped with a buried auxiliary tool, the axis of the second buried pipe and the axis of the rear end portion are on the same axis. Will do. In addition, since the distal end portion is also loosely fitted to the second embedded pipe, the axial center of the rear end portion and the axial center of the distal end portion exist on the same axial center. That is, the shaft center of the second buried pipe and the buried auxiliary tool exist on the same shaft center.

And since the shaft center of the second buried pipe and the buried auxiliary tool exist on the same shaft center, when the first buried pipe is pressed and pushed out by the second buried pipe equipped with the buried auxiliary tool, The buried pipe does not cause a core shake with respect to the buried auxiliary tool. Moreover, since the front-end | tip part is loosely fitted by the 1st burial pipe and the 2nd burial pipe, a core blur does not raise | generate the 1st burial pipe and the 2nd burial pipe.
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 the core blur. .

The characteristic configuration of the buried auxiliary tool for the buried pipe used in the construction method of the buried pipe according to the present invention is as follows:
The said positioning part exists in the point comprised as a some cylindrical projection part of a different outer diameter with the same axial center.

According to the above configuration, the second embedded 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 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 a construction site where a buried pipe is laid, it is preferable because the number of members provided at the construction site can be reduced.

Schematic configuration diagram of construction method for buried pipes Configuration of buried auxiliary tool and relationship diagram between first buried pipe and second buried pipe Configuration diagram of the tip Rear end configuration diagram Configuration diagram of support shaft Configuration diagram of extension indicating shaft Explanatory diagram of start-up construction process (before start-up construction) Explanatory diagram of start-up construction process (after start-up construction) Explanatory drawing of the embedding process (at the time of embedding) Explanatory drawing of burial process (after burial) Explanatory diagram of reaching anti-building process Illustration of the replacement process Explanatory drawing at the end of the replacement process Explanatory drawing of the removal process (at the start of the sealing process) Explanatory drawing of removal process (immediately before completion of sealing process) Explanatory drawing of the removal process (at the end of the sealing process) Explanatory drawing when the removal process is completed

Based on FIG. 1 to FIG. 17, a construction method for a buried pipe and a buried auxiliary tool according to an embodiment of the present invention will be described.
First, the outline | summary of the construction method of the buried pipe which concerns on this embodiment is demonstrated.

As shown in FIG. 1, the buried pipe construction method according to the present embodiment presses the buried first buried pipe 10 with a buried auxiliary tool 100 attached to the second buried pipe 20, and first buried The first buried pipe 10 is pushed out from the starting side 40 constructed on one end side of the pipe 10 to the arrival side 50 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 performed.
Although FIG. 1 shows a part of the replacement process, the embedding assisting tool 100 is pressed by the pressing force generation unit 91, and the pressing force causes the first embedded tube 10 to reach the starting resistance 40 side. The case where it presses toward 50 side is shown.

Although the details of this replacement step will be described later, it is performed in at least the following three situations.
(1) When the second embedded pipe 20 is newly installed in a state where the first embedded pipe 10 is not embedded.
(2) When the first embedded pipe 10 is replaced with the second embedded pipe 20 in a state where the first embedded pipe 10 is embedded.
(3) When removing the first buried pipe 10 in a state where the first buried pipe 10 is buried.

Next, an outline of the embedding auxiliary tool 100 used in the construction method of the embedding pipe according to the present embodiment will be described.
The embedding assisting tool 100 according to the present embodiment is mounted after the front end portion 110 attached to the end portion 22 on one end side of the second embedded tube 20 and the end portion 21 on the other end side of the second embedded tube 20. The end portion 130 includes a support portion 120 that is inserted into the second embedded pipe 20 and supports the front end portion 110 and the rear end portion 130, and the front end portion 110 is an end portion on the start-up side of the first embedded tube 10. 11, a first insertion portion 111 that is loosely fitted to the first insertion portion 11, a second insertion portion 112 that is loosely fitted to the end portion 22 on the side facing the first buried tube 10 that is one end side of the second buried tube 20, and the first insertion portion 111 and the 2nd insertion part 112, and the press part 113 which presses the edge part 11 by the side of the starting resistance of the 1st buried pipe 10 is provided.

The outline | summary about the embedding auxiliary tool 100, the 1st embedding pipe 10, and the 2nd embedding pipe 20 is shown in FIG.
FIG. 2 shows the positional relationship of the buried auxiliary tool 100, the second buried pipe 20, and the first buried pipe 10 when the buried auxiliary tool 100 is used. The buried auxiliary tool 100 attached to the second buried pipe 20 is shown in FIG. It is illustrated in a positional relationship when the first embedded pipe 10 is pressed.

In this example, the case where the 1st burial pipe 10 and the 2nd burial pipe 20 are the burial pipes used for a gas pipe is shown.
Moreover, in this example, the case where the embedding auxiliary tool 100, the 1st embedding pipe | tube 10, and the 2nd embedding pipe | tube 20 are the following materials, respectively is shown.
Each member constituting the embedding auxiliary tool 100 is a stainless material.
The first buried pipe 10 is an iron cast iron pipe.
The second buried pipe 20 is a polyethylene pipe that is softer than the cast iron pipe and made of polyethylene. Therefore, the second buried pipe 20 is more easily damaged than the cast iron pipe.
The combination of the material of the first buried pipe 10 and the second buried pipe 20 is a gas pipe renewal construction in which an old-style gas pipe cast iron pipe is replaced with a new polyethylene pipe for a gas pipe having excellent durability. It is assumed to be constructed.

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 the second buried pipe 20 is liable to be damaged during laying.

Examples of the pipe material assumed as the first buried pipe 10 are listed below. When the first buried pipe 10 is a gas pipe, a resin such as a polyethylene pipe, a polypropylene pipe, a vinyl chloride pipe, or a pipe material using a fluororesin-based material is used. Examples of the pipe material, cast iron pipe, steel pipe, stainless steel pipe, etc. can be listed.
If the first buried pipe 10 is other than a gas pipe, it may be another pipe material.

When the pipe material assumed as the second buried pipe 20 is listed as an example, when the second buried pipe 20 is a gas pipe, in addition to a polyethylene pipe, a polypropylene pipe, a vinyl chloride pipe, a pipe material using a fluororesin-based material, etc. There is a resin pipe material. There are also cases such as cast iron pipes, steel pipes and stainless steel pipes.
If the second buried pipe 20 is other than a gas pipe, it may be another pipe material.

In the construction method of the buried pipe according to the present embodiment, when a so-called hydraulic jack for earthing is used as the pressing force generating portion 91, the diameters of the first buried pipe 10 and the second buried pipe 20 are JIS standards. The nominal diameter of 32A to 100A is particularly suitable. Specifically, pipes having nominal diameters of 32A, 50A, 75A, and 100A are typical examples.
In this example, the case where the thing corresponding to the said pipe diameter is used for the embedding auxiliary tool 100 is illustrated.

  Note that the tube diameters of the first embedded tube 10 and the second embedded tube 20 are not limited to the above-described tube diameters, and other pressing devices are used as the pressing force generation unit 91 (for example, as the pressing force generation unit 91). In the case of using an electric hydraulic jack that is stronger than the hydraulic jack for earth retaining), the construction method of 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 first buried pipe 10 and the second buried pipe 20 are made of different materials, when the JIS standard pipe member is used, the actual size of the outer diameter of the first buried pipe 10 is slightly larger than that of the second buried pipe 20. growing. However, the outer diameter difference is usually about 1 mm.
In addition, the actual size of each inner diameter indicates a combination in which the first embedded pipe 10 is slightly smaller than the second embedded pipe 20.
This construction method is particularly suitable when the diameter of the first buried pipe 10 or the second buried pipe 20 is 100 A or less.
Further, it can be suitably used when the outer diameter of the second embedded pipe 20 is the same as the actual diameter of the first embedded pipe 10 or is the same nominal diameter and slightly smaller than the actual diameter.

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

  The first insertion portion 111 is configured to be fitted into the first embedded pipe 10. In this example, the first insertion portion 111 is loosely fitted to the end portion 11 on the start-up side of the first embedded tube 10. The first insertion part 111 is a part for fitting the end part 110 into the end part 11 of the first embedded pipe 10.

The first insertion portion 111 is formed in a substantially columnar shape and is loosely fitted into the tube of the first embedded tube 10. That is, the first insertion portion 111 is formed in a cylindrical shape having an outer diameter that is slightly smaller than the inner diameter of the first embedded tube 10 and is loosely fitted into the tube of the first embedded tube 10.
An end of the first insertion portion 111 on the first embedded tube 10 side is chamfered, for example, and is easily fitted into the first embedded tube 10.
In this example, the first insertion portion 111 includes a linear motion portion 111b and a chamfered portion 111a.

  The thickness of the 1st insertion part 111, ie, the depth fitted in the 1st embedding pipe | tube 10 of the 1st insertion part 111, is 10 mm, for example. This thickness is such that when the first insertion portion 111 is fitted into the first embedded tube 10, the fitting portion between the first insertion portion 111 and the first embedded tube 10 does not unexpectedly come off under normal handling. It only needs to have a certain thickness.

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

  The second insertion portion 112 is configured to fit into the second embedded pipe 20. In this example, the second insertion portion 112 is loosely fitted to the end portion 22 of the second embedded tube 20 on the side facing the first embedded tube 10. The second insertion part 112 is a part for fitting the end part 110 into the end part 22 of the second embedded pipe 20.

The second insertion portion 112 is formed in a substantially columnar shape, and is loosely fitted into the tube of the second embedded tube 20. That is, the second insertion portion 112 is formed in a cylindrical shape having an outer diameter that is slightly smaller than the inner diameter of the second embedded tube 20 and is loosely fitted into the tube of the second embedded tube 20.
The second embedded tube 20 side end portion of the second insertion portion 112 is chamfered, for example, and is easily fitted into the second embedded tube 20.

  The thickness of the second insertion part 112 is, for example, 10 mm. In other words, the depth of the second insertion portion 112 fitted into the second embedded pipe 20 is, for example, 10 mm. This thickness is such that when the second insertion portion 112 is fitted into the second embedded tube 20, the fitting portion between the second insertion portion 112 and the second embedded tube 20 does not unexpectedly come off by normal handling. It only needs to have a certain thickness.

It supplements about the relationship between the 1st insertion part 111 and the 2nd insertion part 112. FIG.
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 standards of the first embedded tube 10 and the second embedded tube 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. But it may be slightly different.
In this example, since the inner diameter of the first embedded tube 10 is slightly larger than that of the second embedded tube 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 inner diameter difference 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 connection portion between the first insertion portion 111 and the second insertion portion 112. Moreover, it functions as a part that presses the first buried pipe 10.
The pressing part 113 is usually a columnar member having the same outer diameter as the first embedded pipe 10 or the second embedded pipe 20 or a slightly larger outer diameter. Examples of the columnar shape include a columnar shape and a conical shape.
In this example, since the outer diameter of the first embedded tube 10 is slightly smaller than that of the second embedded tube 20, the pressing portion 113 has a conical shape that is slightly reduced in diameter from the first insertion portion 111 toward the second insertion portion 112. Shows the case.
The outer diameter of the maximum diameter portion of the pressing portion 113 is slightly larger than that of the second embedded pipe 20. When the outer diameter of the maximum diameter portion of the pressing portion 113 is set to be slightly larger than the second embedded pipe 20, when the first embedded pipe 10 is replaced with the second embedded pipe 20, Easy to insert. This is because the space where the first embedded pipe 10 was present is expanded by the pressing portion 113.
The thickness of the pressing part 113 is 10 mm, for example. This thickness should just be the thickness which has the intensity | strength of a grade which is not deform | transformed or damaged when the press part 113 presses the 1st buried pipe 10.

It supplements about the relationship between the front-end | tip part 110, the 1st buried pipe 10, and the 2nd buried pipe 20. FIG.
As shown in FIG. 2, the tip portion 110, the first embedded tube 10, and the second embedded tube 20 share the same axis P.

The support portion 120 is a member that supports the distal end portion 110 from the inside of the second embedded tube 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 front end 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 cylindrical rod-shaped member having a diameter of 30 mm is used.

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

  The rear end portion 130 includes a positioning portion 131 that is loosely fitted to the end portion 21 of the second embedded tube 20, a transmission portion 132 that is larger in diameter than the second embedded tube 20 and receives a pressing force from the outside, and a support portion 120. And a rear end connecting portion 139 for connecting to the rear end.

  The positioning part 131 is configured to be fitted into the second embedded pipe 20. In this example, the positioning part 131 is loosely fitted to the end part 21 on the other end side of the second embedded pipe 20. The positioning part 131 is a part for fitting the rear end part 130 into the end part 21 of the second embedded pipe 20.

The positioning part 131 is formed in a substantially columnar shape and is loosely fitted in the pipe of the second embedded pipe 20. That is, the positioning part 131 is formed in a cylindrical shape having an outer diameter that is slightly smaller than the inner diameter of the second embedded pipe 20, and is loosely fitted in the pipe of the second embedded pipe 20.
The end of the positioning part 131 on the second embedded pipe 20 side may be chamfered so that it can be easily fitted into the second embedded pipe 20.

In this example, the positioning part 131 shares the same axis P as the axial direction of the second embedded pipe 20 and is configured as a structure projecting into a plurality of cylindrical shapes having different outer diameters. In this example, as a structure projecting in a cylindrical shape as the positioning portion 131, the transmission portion 132 includes two cylindrical projection portions 131 a and 131 b as the positioning portion 131, and functions as one rear end portion 130. Show.
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 (columnar protrusions 131a and 131b) fitted into the second embedded tube 20 is, for example, 4 mm.

Three or more structures protruding in a columnar shape functioning as the positioning portion 131 may be provided.
For example, four structures that protrude in a columnar shape to serve as the positioning portion 131 may be provided corresponding to the case where the second embedded pipe 20 has the nominal diameters 32A, 50A, 75A, and 100A referred to in JIS standards. . In this case, the transmission part 132 is formed to have a larger diameter than the second embedded pipe 20 having a nominal diameter 100A, which is the largest pipe in which the positioning part 131 is expected to be fitted.

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

  An example of the connection / support relationship among 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 part 110 and the support part 120 will be supplemented.
The distal end connecting portion 114 of the distal end portion 110 is formed by a female screw.
The distal end support connection portion 124 of the support portion 120 is configured by a male screw that can be screwed and connected to the distal end connection portion 114.
That is, the distal end portion 110 is screwed and connected by the distal end connection portion 114 and the distal end 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 connection portion 124 is screwed and connected to the tip connection portion 114 when the tip portion 110 is connected to the support portion 120. Also, it plays a role of reinforcing the strength of the tip connecting portion 114. In this example, a nut-like member that is 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 connection portion 114 are fixed with a double nut.

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

It supplements about the relationship between the axial center P, the front-end | tip part 110, the support part 120, and the rear-end part 130. FIG.
The axis P is at a position passing through the centers of the first insertion portion 111 and the second insertion portion 112 of the front end portion 110 and the center of the positioning portion 131 of the rear end portion 130. Further, in this example, the shaft center P is at a position passing through the centers of the support shaft portion 121 and the extended support shaft portion 122 of the support portion 120.

It supplements about the support part 120. FIG.
In this example, the support part 120 may function as an integral support part 120 by connecting one or more extended support shaft parts 122 to the support shaft part 121. That is, the extended support shaft portion 122 can be connected as necessary.

  In the case where one or more extended support shaft portions 122 are connected to the support shaft portion 121 and the support portion 120 functions as an integrated support portion 120, the extended support shaft portion 122 has the same external thread as the rear end connection portion 139. The extension connection part 126 formed in (1) and the rear end support connection part 123b (123) are provided.

The extension connection portion 126 can be screwed with 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 extended support shaft portions 122 having different lengths are prepared and used in appropriate combination, the support portion 120 can be adjusted to an arbitrary length.
Therefore, the length of the embedding auxiliary tool 100 can be arbitrarily adjusted and used for the second embedding pipe 20 having an arbitrary length. For example, when the embedding auxiliary tool 100 is used for the first embedded pipe 10 or the second embedded pipe 20 having an arbitrary length at a construction site where the replacement process is performed, the length of the embedded auxiliary tool 100 is arbitrarily adjusted. This is preferable because the number of members provided at the construction site can be reduced.

It supplements about the relationship between the embedding auxiliary tool 100 and the 2nd embedding pipe 20, and mounting | wearing of the embedding auxiliary tool 100 to the 2nd embedding pipe 20. FIG.
The embedding assisting tool 100 adjusts the length of the support portion 120 to some extent between the support shaft portion 121 and the extended 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 embedded pipe 20.

Then, the second embedded pipe 20 is sandwiched between the front end portion 110 and the rear end portion 130. And the front-end | tip part 110 and the rear-end part 130 are mutually connected and supported by the support part 120, respectively, and the embedding auxiliary tool 100 is mounted | worn to the 2nd embedding pipe 20, and it fixes. 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 mounting of the embedding auxiliary tool 100 to the second embedding pipe 20 is completed.

Subsequently, the construction method of the buried pipe according to the present embodiment when the buried auxiliary tool 100 is used will be described based on a specific example.
1, 2, and 7 to 17 are used for the description.
First, a case where the first buried pipe 10 is not buried in advance in the ground 30 will be described. That is, the case where the 2nd buried pipe 20 which becomes a newly installed pipe is newly laid is demonstrated.

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

When newly installing the second embedded pipe 20, that is, when the first embedded pipe 10 is not previously embedded in the ground 30, the following method is used.
A start-up construction step for constructing a start-up resistance 40 at one end side in a cylindrical embedding place where the first embedding pipe 10 is buried, and an arrival resistance 50 at the other end side in the planned embedding place. The reaching anti-construction process and the embedding process of laying the first embedded pipe 10 at the planned embedding location from the starting resistance 40 by the propulsion method are performed, and the replacement process is further performed. Note that these series of steps are performed in the order in which the embedding step is performed after the start anti-construction step, the ultimate anti-construction step is performed, and the replacement step is further performed.
Then, after laying the second buried pipe 20, the start-up resistance 40 and the arrival resistance 50 are backfilled.
Hereinafter, the first embodiment will be described in detail.

[Situation explanation]
In this example, as a specific example, a case where the 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 as an example. FIG. 7 shows the state.
In this example, there is a boundary portion 33 provided with streets and curbs 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 0.70 m, for example.

In this example, if the second buried pipe 20 is to be laid out by digging widely 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, After the curb is removed, a large excavation is made from the basement of the road side ground 31 to the basement of the sidewalk side ground 32, the second buried pipe 20 is laid, and then the excavated part is backfilled. And the curb needs to be restored.
Therefore, the method of digging widely by the open-cut method from the basement of the road side ground 31 to the basement of the sidewalk side ground 32 and laying the second buried pipe 20 is not preferable because it is uneconomical in this example.

Further, in order to maintain the boundary portion 33, it is assumed that the starting side 40 is constructed on the road side ground 31, the reaching side 50 is constructed on the sidewalk side ground 32, and the boundary portion is directed from the starting side 40 to the reaching side 50. In the case where a tunnel is formed by burrowing the underground of 33 and an attempt is made to lay the second buried pipe 20, the ground around the tunnel, that is, the underground ground of the boundary 33 is formed when the tunnel is formed. Even if it collapses and does not collapse, it is inevitable that voids will be generated or the ground will soften. Therefore, safety risks such as land subsidence are unavoidable when using the digging method.
Therefore, the construction method in which the tunnel is formed by the digging method and the second buried pipe 20 is laid is not preferable in this example because there is a safety problem.

  Therefore, in this example, the laying method for performing the following steps including the start-up construction process, the reaching-up construction process, and the replacement process is selected. More specifically, after carrying out the start anti-construction step, the embedding step is carried out, after which the ultimate anti-construction step is carried out, and further the replacement step is carried out. This is because the following construction method is economical because there is no need to restore streets and curbs at the boundary 33, and there is no safety risk such as land subsidence.

[Start-up construction process]
FIG. 7 and FIG. 8 show the construction process of the start anti-40 in this start anti-build process. FIG. 7 shows a state before the start-up anti-40 is constructed, and FIG. 8 shows a state after the start-up anti-40 is constructed.
A start-up construction step for building up a start-up construction 40 on the road side ground 31 is performed. In order to construct the start counter 40 without affecting the boundary 33, the start counter 40 is constructed away from the boundary 33 by a distance E. When the depth of the start counter 40 is about 1 m, the distance E is 0.30 m, for example.

[Embedding process]
After carrying out the start-up construction process, a burying process of laying the first buried pipe 10 at a predetermined position from the start-up 40 by the propulsion method is carried out. Here, the predetermined position is a place where the second buried pipe 20 is to be buried and laid. 9 and 10 show the embedding process.
The propulsion method referred to in this example is a non-cutting method in which the first buried pipe 10 is buried without cutting the entire ground 30 through a pipe that is excavated in a tunnel shape in the ground. For example, a so-called small diameter pipe propulsion method can be used. Of the small-diameter pipe propulsion methods, a press-fitting method, an auger method, a muddy water method, a mud 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 embedding process will be described in detail.
In the embedding process shown in this example, the first embedded pipe 10 is pressed toward the predetermined position by the pressing force generating unit 91 from the starting resistor 40, and the first embedded pipe 10 is propelled under the boundary 33 to be embedded. I will do it. Here, the predetermined position is a cylindrical embedding location where the first embedding pipe 10 is embedded, and a predetermined embedding location where the second embedding pipe 20 is embedded.
FIG. 9 shows a state when the first buried pipe 10 is buried.

  When propelling the first buried pipe 10 below the boundary 33 toward a predetermined position, the first buried pipe 10 itself forms a tunnel excavated hole in the ground, so that the ground including the boundary 33 The first buried pipe 10 can be buried without cutting the entire 30.

When propelling the first buried pipe 10 toward a predetermined position, the excavated earth and sand enters the pipe of the first buried pipe 10.
The earth and sand that has entered the pipe of the first buried pipe 10 may not be removed from the pipe of the first buried pipe 10 while the first buried pipe 10 is buried, and if necessary, it may be removed as necessary. May be removed. For example, water can be passed through the first buried pipe 10 from the start counter 40 side to wash away the earth and sand.

Here, the pressing force generation unit 91 is a device or the like that presses the first embedded pipe 10 toward a predetermined position, and in this example, an example using a so-called hydraulic jack for earthing is illustrated. As long as the pressing force generation part 91 is provided with the same pressing function, it can be used without any particular limitation.
If the first buried pipe 10 is laid at a predetermined position, the burying step is completed.
FIG. 10 shows a state after the first buried pipe 10 is buried.

[Achieving anti-building process]
Next, an arrival resistance construction process for constructing the arrival resistance 50 on the sidewalk side ground 32 is performed.
FIG. 11 shows a state in which the reaching resistance 50 is constructed by performing the reaching resistance construction process.
In the reaching resistance building process, in order to build the reaching resistance 50 without affecting the boundary portion 33, the reaching resistance 50 is constructed away from the boundary portion 33 by a distance E as shown in FIGS. The When the depth of the reach 50 is about 1 m, the distance E is 0.30 m, for example.
In other words, the start anti-40 and the ultimate anti-50 are constructed approximately 1.30 m apart in this example. Therefore, a steel pipe of about 1.50 m is selected as the first buried pipe 10. As the second buried pipe 20, a polyethylene pipe having a length of about 1.50 m and the same length as the first buried pipe 10 is selected.

The reaching resistance construction process will be described in detail.
Since the reaching resistance building process is performed after the burying process, the wall 52 of the reaching resistance 50 is prevented from collapsing or collapsing.
If the embedding process is performed after the reaching resistance 50 is constructed, when one end of the first embedded pipe 10 reaches the reaching resistance 50, the wall 52 is collapsed or collapsed due to the stress propelling the first embedded pipe 10. I can not escape.
However, if the reaching resistance 50 is constructed after the burying process of laying the first buried pipe 10 in a predetermined position, the wall portion 52 is freed from the opportunity of receiving stress for propelling the first buried pipe 10. Therefore, the wall 52 is free from collapse and collapse.

[Replacement process]
FIG. 12 shows the replacement process. Next, a replacement step of replacing the first buried pipe 10 with the second buried pipe 20 attached with the buried auxiliary tool 100 is performed.

The replacement process will be described in detail with reference to FIG. 1, FIG. 2, and FIG.
In the replacement step, the embedding assisting tool 100 is first attached to the second embedding pipe 20 as shown in FIG.
And the transmission part 132 of the auxiliary burying tool 100 attached and attached to the second embedded pipe 20 is pressed from the outside by the pressing force generating part 91, and the first embedded pipe 10 is pressed by the embedded auxiliary tool 100. The first embedded tube 10 is pushed into the position where the first embedded tube 10 was present together with the auxiliary auxiliary tool 100 while the first embedded tube 10 is pushed out to the reach 50, and the first embedded tube 10 is moved to the first position. Replace with the two buried pipes 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 counter 40 side of the first embedded tube 10 is pressed through the support portion 120 and the pressing portion 113 of the front end portion 110.

In the replacement step, the first insertion portion 111 of the embedding assisting tool 100 is loosely fitted to the first embedding tube 10 and the pressing portion 113 presses the end 11 on the start-up side.
At this time, by inserting the first insertion portion 111 into the first buried pipe 10, the axis of the second buried pipe 20 and the buried auxiliary tool 100 and the axis P of the first buried pipe 10 are matched. Then, when the embedding auxiliary tool 100 is pressed straight by the pressing force generator 91 toward the ultimate resistance 50 in the axial direction of the shaft center P, the first embedded tube 10 is smoothly moved by the second embedded tube 20. Can be replaced.

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

It supplements about a substitution process.
Although illustration is omitted, when the replacement step is completed, the second buried pipe 20 is usually connected to another buried pipe. The connection may be performed by a commonly used method.
Then, if the starting resistance 40 and the reaching resistance 50 are backfilled, the laying of the second embedded pipe 20 is completed. Illustration of this state is omitted.

[Second Embodiment]
[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 in a state where the first buried pipe 10 is buried will be described.

  That is, the case where the 1st embedment pipe | tube 10 is embed | buried under the ground of the ground 30 previously as an existing pipe | tube is demonstrated. That is, this is a case where the existing pipe is replaced with the second buried pipe 20 that becomes a new pipe.

  When the first buried pipe 10 is buried in the ground of the ground 30 in advance, the start and reach process and the reach and reach process are performed, and then the replacement process is performed and the second buried pipe 20 is laid. The start-up 40 and the reach-up 50 are backfilled. Hereinafter, differences of the second embodiment from the first embodiment will be described.

  In the case where an existing pipe that can be the first buried pipe 10 is embedded in the ground of the ground 30 in advance, any of the start-to-reaching process and the reaching-anti-reaching process may be performed first.

And after carrying out the start anti-reaching step and the reach anti-reaching step to construct the start anti-40 and the arrival anti-50, the start anti-40 side of the existing pipe embedded in the ground of the ground 30 in advance It is necessary to cut the side of the arrival resistance 50 and cut out the first buried pipe 10 to be replaced with the second buried pipe 20. At this stage, the state shown in FIG. 11 is reached.
Thereafter, the replacement step may be performed in the same manner as in the first embodiment.

[Third embodiment]
[When removing old pipes]
A case where the first embedded pipe 10 is removed while the first embedded pipe 10 is embedded will be described.

  That is, a case where the first buried pipe 10 buried in advance in the ground 30 is removed will be described. That is, a case where the first buried pipe 10 that has become an old pipe is removed and the portion (position) where the first buried pipe 10 existed is backfilled will be described.

  In the case where the first buried pipe 10 that has been aged in advance is buried in the ground 30, the start anti-reaching process and the reach anti-reaching process are performed, and then the replacement process is performed to replace the first buried pipe 10. After removing and laying the second buried pipe 20, the removal process of further removing the second buried pipe 20 is carried out, and then the starting resistance 40 and the reaching resistance 50 are backfilled, the first buried pipe 10 is removed. Complete. Hereinafter, differences of the third embodiment from the second embodiment will be described.

This example is the same as the second example up to the point where the replacement step is performed.
Below, the removal process which removes the 2nd buried pipe 20 further is demonstrated. The removal process is a process of removing the second embedded pipe 20 and refilling the position where the second embedded pipe 20 was present.

[Removal process]
FIG. 14, FIG. 15, FIG. 16, and FIG. 17 show a removal process for removing the second buried pipe 20.
The removal process means that the second buried pipe 20 is slightly pulled out to the start resistance 40 side, and the open end 62 on the arrival resistance 50 side of the space 61 generated by the second buried pipe 20 being pulled out is replaced with the arrival resistance 50. The sealing step of sealing from the side is performed, and then the filler 64 is inserted into the space 61 through the end 22 on the side of the arrival resistance 50 of the second embedded tube 20 while further pulling out the second embedded tube 20. This is a step of sealing and removing the second buried pipe 20. The sealing process is a process included in the removal process.

The removal process will be described in detail.
In this removal process, first, the starting resistance 40 and the reaching resistance 50 are constructed.
And the sealing process which seals the space 61 in which the 2nd buried pipe 20 existed is implemented.
That is, the second buried pipe 20 is slightly pulled out to the starting resistor 40. Then, the open end 62 on the arrival resistance 50 side of the space 61 generated by the second buried pipe 20 being pulled out to the start resistance 40 side is sealed from the arrival resistance 50 side. The open end 62 is sealed and closed. FIG. 14 shows a state when the open end 62 is sealed at the start of this sealing step.

Thereafter, while the second embedded pipe 20 is further pulled out to the starting resistance 40, the space 64 is filled with the filler 64 with the tube 65 via the end portion 22 on the arrival resistance side of the second embedded pipe 20. Is sealed.
At the stage where the extraction of the second buried pipe 20 is completed (the stage where the second buried pipe 20 is removed from the starting side 40), 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. The sealing process ends here.

  In this example, as the filler 64, what is generally known as an underground sealant, encapsulant, or filler, such as a slurry obtained by pulverizing cement or earth and sand, can be used. The filler 64 has good fluidity and can fill the space 61 without a gap, and it is preferable that the volume of the filler 64 is not reduced after filling or even if it is reduced. This is because when the volume of the filler 64 is reduced, a space is generated, causing ground subsidence.

Supplement the removal process.
When the first buried pipe 10 that has become an old pipe is removed, earth and sand are stuck to the surface of the first buried pipe 10, and the surface is rusted to increase the friction with the ground. It may not be possible. However, once the first buried pipe 10 is replaced with the second buried pipe 20, earth and sand are not stuck to the second buried pipe 20 or rust is generated, and the second buried pipe 20 has friction with the ground. Since it becomes a small state, the 2nd buried pipe 20 can be smoothly pulled out manually, for example. Therefore, the sealing process can be easily performed.

When the sealing process is finished, the space 61 is filled with the filler 64. FIG. 16 shows a state at the end of this sealing step.
Thereafter, the start-up resistance 40 and the arrival resistance 50 are backfilled with earth and sand 41, 51.
The removal process for removing the second buried pipe 20 is thus completed. FIG. 17 shows a state when this removal process is completed.

  As described above, when the second buried pipe 20 is newly laid, it is economical without widely excavating the ground 30, avoiding the collapse of the ground below the ground 30, and damaging the second buried pipe 20. The construction method for the second buried pipe 20 that can be suppressed and the auxiliary tool 100 for the second buried pipe 20 used in the construction method can be provided.

[Another embodiment]
(1) In the above embodiment, after the start-up construction process is performed and the start-up construction 40 is constructed, the embedding process of laying the first buried pipe 10 at a predetermined position from the start-up construction 40 by the propulsion method is performed. The case where the reach resistance construction process for constructing the reach resistance 50 is performed and the replacement process for replacing the first buried pipe 10 with the second buried pipe 20 to which the buried auxiliary tool 100 is attached is shown.

However, after the start-up construction process is performed and the start-up construction 40 is constructed, the reaching-up construction process for constructing the arrival resistance 50 is performed, and the first buried pipe 10 is laid at a predetermined position from the start-up construction 40 by the propulsion method. After the embedding process is performed, a replacement process for replacing the first embedding pipe 10 with the second embedding pipe 20 to which the embedding auxiliary tool 100 is further attached may be performed. 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 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 52, it is better to construct the start resistance 40 and the arrival resistance 50 first. May be easier.

(2) In the above embodiment, the embedding auxiliary tool 100 is attached to the tip portion 110 attached to the end portion 22 on the one end side of the second embedded tube 20 and the end portion 21 on the other end side of the second embedded tube 20. And a support portion 120 that is inserted into the second embedded pipe 20 and supports the front end portion 110 and the rear end portion 130, and the front end portion 110 is on the start-up side of the first embedded tube 10. A first insertion portion 111 that is loosely fitted to the end portion 11 of the first insertion portion, a second insertion portion 112 that is loosely fitted to the end portion 22 on the side facing the first buried tube 10 that is one end side of the second buried tube 20, A pressing portion 113 provided between the one insertion portion 111 and the second insertion portion 112 and pressing the end portion 11 on the starting resistance side of the first embedded pipe 10, and the rear end portion 130 is Positioning part 131 loosely fitted to the end 21 of the two embedded pipes 20 and a larger diameter than the second embedded pipe 20, and pressing from the outside A transmission unit 132 for receiving the indicated if a rear connection portion 139 to be connected to the support 120.

However, the embedding auxiliary tool 100 includes a front end portion 110 attached to the end portion 22 on one end side of the second embedded tube 20 and a rear end portion 130 attached to the end portion 21 on the other end side of the second embedded tube 20. The distal end portion 110 is opposed to the first insertion portion 111 that is loosely fitted to the start portion 11 of the first embedded tube 10 and the first embedded tube 10 that is one end side of the second embedded tube 20. A second insertion portion 112 that is loosely fitted to the end portion 22 on the side to be engaged, and the first insertion portion 111 and the second insertion portion 112 are provided between the start-end side end portion 11 of the first embedded pipe 10. The rear end portion 130 includes a positioning portion 131 that loosely fits to the end portion 21 of the second embedded tube 20 and a diameter larger than that of the second embedded tube 20, and receives a pressing force from the outside. You may comprise and comprise the transmission part 132 which receives.
That is, the embedding auxiliary tool 100 may not include the support part 120.

  The embedding auxiliary tool 100 that includes the front end portion 110 and the rear end portion 130 and does not include the support portion 120 can be used, for example, when the second embedding tube 20 is a steel pipe and is sufficiently rigid.

(3) In the above embodiment, as the removal step of removing the second embedded pipe 20, the second embedded pipe 20 is slightly pulled out to the start resistance 40 side, and the second embedded pipe 20 is pulled out to generate the space 61. A sealing step of sealing the open end 62 on the arrival resistance 50 side from the arrival resistance 50 side is performed, and then the second embedded pipe 20 reaches the space 61 while further pulling out the second embedded pipe 20. The case where the filler 64 is sealed through the end 22 on the anti-side is shown.

  However, as a removal process of removing the second buried pipe 20, the second buried pipe 20 is slightly pulled out to the arrival resistance 50 side, and the second buried pipe 20 is pulled out, so that the space 61 on the start resistance 40 side is generated. A sealing step of sealing the open end 62 from the arrival resistance 50 side is performed, and then the second embedded pipe 20 is further pulled out, and the end of the second embedded pipe 20 on the start resistance 40 side is inserted into the space 61. The filler 64 may be sealed through the part 21.

(4) In the above embodiment, the connection between the support portion 120 and the rear end portion 130 is performed when 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 120 and the rear end 130 may be connected by welding the support 120 and the rear end 130. In this case, although the support part 120 and the rear-end part 130 become an integral member, the usage method when using it as the embedding auxiliary tool 100 is the same as that of the above-mentioned Example. In addition to screw connection and welding connection, other general connection methods such as fitting and joint connection can also be used.

(5) In the above embodiment, as a case where the second embedded pipe 20 is newly installed in a state where the first embedded pipe 10 is not embedded, the first embedded pipe 10 is not embedded in advance in the ground 30. Then, the start anti-reach process is performed, the embedding process is performed, the reach anti-build process is performed, and the replacement process is further performed to lay the second buried pipe 20 having the same diameter as the first buried pipe 10. Later, the case where the start-up resistance 40 and the arrival resistance 50 are backfilled is shown.

However, even if a third buried pipe (not shown) is buried in the ground 30 in advance, and the third buried pipe is sufficiently narrower 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 the embedding process of embedding the first embedded pipe 10 is performed, the first embedded pipe 10 is promoted in such a manner that the third embedded pipe is inserted inside the first embedded pipe 10. Then, what is necessary is just to replace the 1st buried pipe 10 which contains the said 3rd buried pipe inside by the 2nd buried pipe 20 in a substitution process.

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

  Note that the configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises. The embodiment disclosed in this specification is an exemplification, and the embodiment of the present invention is not limited to this. The embodiment can be appropriately modified without departing from the object of the present invention.

  The present invention relates to a construction method for a buried pipe in which a first buried pipe that has been buried in advance is replaced with a second buried pipe having the same diameter as that of the first buried pipe, and the second buried pipe is laid. It can be used as a buried auxiliary tool for buried pipes used in the above.

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: Start resistance 50: Arrival resistance 61: Space 62: Open end 64: Filler 100: Embedding aid 110: Tip portion 111: First insertion portion 112: Second insertion portion 113: Pressing portion 120: Support Part 130: Rear end part 131: Positioning part 131a: Columnar protrusion 131b: Columnar protrusion 132: Transmission part P: Axis center

Claims (9)

  The first buried pipe that is buried is pressed by a buried auxiliary tool attached to the second buried pipe, and the first buried pipe of the first buried pipe is constructed from the starting side constructed on one end side of the first buried pipe. A buried pipe construction method for performing a replacement step of pushing out to the arrival resistance side constructed on the other end side and replacing the first buried pipe with the second buried pipe.   A start-up construction step for building up the start-up resistance on one end side in the cylindrical burying planned place where the first burying pipe is buried, and the reach resistance on the other end side in the planned burying place 2. The buried pipe according to claim 1, wherein the reaching resistance building process is performed, and the first buried pipe is laid at the planned site by the propulsion method from the starting resistance, and the replacement process is further performed. Construction method.   The construction method of the buried pipe according to claim 2, wherein the embedding process is carried out after the start-up construction process is carried out, then the ultimate construction process is carried out, and further the replacement process is carried out.   A start-up construction step for constructing the start-up resistance on one end side of the first buried pipe that is buried, and an arrival-resistance construction step for constructing the reach resistance on the other end side of the first buried pipe The construction method of the buried pipe according to claim 1, wherein the replacement step is further performed. After performing the replacement step,
Performing a sealing step of slightly pulling out the second buried pipe to the starting resistance side and sealing the open end on the arrival resistance side of the space formed by drawing out the second buried pipe from the arrival resistance side. ,after that,
The second embedded pipe is removed from the starting resistance side by further filling the space with a filler via an arrival resistance side end of the second embedded pipe while further pulling out the second embedded pipe. 4. Construction method of buried pipe as described in 4. The embedding auxiliary tool is inserted into the second embedded tube by inserting a tip end portion attached to one end side of the second embedded tube, a rear end portion mounted on the other end side of the second embedded tube, and the second embedded tube. A front end portion and a support portion for supporting the rear end portion,
The tip portion includes a first insertion portion that is loosely fitted to the start-side end portion of the first embedded tube, and an end portion that faces the first embedded tube that is one end side of the second embedded tube. A second insertion part that is loosely fitted to the first insertion part, and a pressing part that is provided between the first insertion part and the second insertion part and that presses the end of the first buried pipe on the start-up side. Prepared,
In the replacement step, the rear end portion is pressed from the outside, and the end portion on the start-up side of the first buried pipe is pressed through the support portion and the pressing portion of the tip portion. The construction method for buried pipes according to any one of the above. A buried auxiliary tool for use in the construction method of the buried pipe according to claim 1,
A distal end portion mounted on one end side of the second embedded tube, a rear end portion mounted on the other end side of the second embedded tube, and the distal end portion and the rear end inserted into the second embedded tube A support part for supporting the part,
The tip portion includes a first insertion portion that is loosely fitted to the start-side end portion of the first embedded tube, and an end portion that faces the first embedded tube that is one end side of the second embedded tube. A second insertion part that is loosely fitted to the first insertion part, and a pressing part that is provided between the first insertion part and the second insertion part and that presses the end of the first buried pipe on the start-up side. A buried auxiliary tool for buried pipes.   The rear end portion includes a positioning portion that is loosely fitted to the other end side of the second embedded tube, and a transmission portion that is larger in diameter than the second embedded tube and receives a pressing force from the outside. Item 8. A buried auxiliary tool for buried pipes according to Item 7.   The embedding auxiliary tool for an embedding pipe according to claim 8, wherein the positioning portion is configured as a plurality of cylindrical protrusions having the same axis and different outer diameters.

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