JPH0478392A - Duct renewing method - Google Patents

Abstract

PURPOSE:To prevent the irregular damage of a fitting duct by cutting the fitting duct of an existing duct so as to separate them, and advancing a tunnel excavator so as to remove the existing duct while laying a new duct on this track. CONSTITUTION:At the renewing time, a fitting duct 12 is cut in a position 16 slightly above a new duct 14. The fitting duct 12 is thereby divided into a main body part 12a slightly above the cut position 16 and an end part 12b remaining on the existing duct 10 side. A tunnel excavator 34 is moved forward along the existing duct 10 while excavating the existing duct 12 and sediment around, and the new duct 14 provided at this excavator 34 is laid on this track. As a result the fitting duct 12 is prevented from large irregular damage.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for renewing a pipeline by removing an existing pipeline buried underground and laying a new pipeline in its place. .

(Prior Art) Renewal of aging existing pipelines buried underground is generally carried out by the cut-and-cover method. However, this open-cut construction method requires excavation of the ground, so there are limits to where it can be constructed.

In order to solve these problems, a construction method has been proposed in which the existing pipeline is removed by excavating it with a tunnel excavator and a new pipeline is laid in its place.

(Problem to be solved) However, since existing pipes generally have attached pipes such as branch pipes connected to them, large cracks may occur in the attached pipes when the existing pipes are destroyed or excavated. The end of the existing pipeline is irregularly large and loses 6 tL. the result,
Since such attached pipes have lost their water-stop function, the conventional renewal method using a tunnel excavator requires that the attached pipes also be renewed.

The purpose of the present invention is to provide a method for renewing a pipe line without causing irregular and large damage to the attached pipe line.

(Solution Means, Actions, Effects) The renewal method of the present invention is to cut an attached pipe line connected to an existing pipe line at an end on the side of the existing pipe line to separate it from the existing pipe line. The method includes moving an excavator forward along the existing pipeline, removing the existing pipeline by excavating it with the tunnel excavator, and laying a new pipeline in its place.

When the existing pipeline is removed, the attached pipeline is separated from the existing pipeline at the end on the existing pipeline side, so even if the end remaining on the existing pipeline side is excavated by an excavator, there will be no cracks. is formed only on the end portion remaining on the side of the existing pipe, and is not formed on the main body on the side opposite to the existing pipe with respect to the cutting position. Therefore, according to the present invention, the attached pipe line is not damaged irregularly and significantly.

The newly installed conduit and the attached conduit can be connected to each other by a water-impermeable connecting means by drilling a hole in the newly installed conduit and utilizing the hole.

11 As the connection means, a means having an expandable hose part and a flange part integrally continuous with one end of the hose part can be used. and the hose portion is arranged in the newly installed pipeline and the attached pipeline so that the hose portion is in the attached pipeline, and then the flange portion is in liquid-tight contact with the inner surface of the newly installed pipeline, and the hose portion is arranged in the attached pipeline. can be maintained such that it extends within the second tube.

Liquid-tightness between the flange portion and the newly installed pipeline is achieved by arranging a sheet-shaped base wound in the shape of a cylinder so as to be expandable in the radial direction within the newly installed pipeline, and radially expanding the base. the flange portion is pressed against the inner surface of the newly installed conduit by the base, and the plurality of engaging portions provided on the base are engaged with each other to maintain the base in the expanded state. You can keep it by doing this.

Alternatively, the liquid tightness between the flange portion and the newly constructed pipeline can be achieved by using an elastically deformable sleeve and a radially expandable sleeve wound in the shape of a cylinder and disposed within the sleeve. A sheet-shaped base made of the same material is placed in the newly constructed pipeline, and the base is expanded in the radial direction, and the flange portion is pressed against the inner surface of the newly constructed pipeline by the base and the sleeve. This can be maintained by maintaining the base in an expanded state by engaging a plurality of provided engaging portions with each other.

Furthermore, after arranging a sleeve made of a shape memory alloy or a shape memory resin that remembers the shape of the inner surface of the newly installed pipeline within the newly installed pipeline, the sleeve is returned to its original shape, and thereby, The flange portion can be kept in liquid-tight contact with the inner surface of the newly installed pipeline by the sleeve.

(Example) Referring to the first UA], the existing pipe 10 to be updated is defined by an existing pipe, such as a sewage pipe buried underground. The attached pipe line 12 like a branch pipe is connected to the existing pipe line 1
0 toward the ground, and is also connected to the existing pipeline 10.

At the time of renewal, first, the attached pipe line 12 is cut at a position 16 slightly above the newly installed pipe line 14 to be newly laid. Thereby, the attached pipe line 12 has a main body part 12a above the cutting position 16 and an end part 1 remaining on the side of the existing pipe line 10.
2b.

The attachment pipe 12 connects the cutting device to the attachment pipe 12 from the ground side.
Alternatively, the cutting device may be inserted into the attached pipe 12 from inside the existing pipe 10 and the cutting device may be used to cut the attached pipe 12 from inside. 1
You may also cut from the inside of 2.

FIG. 2 shows an embodiment of a cutting device 18 for cutting the attachment conduit 12 from its inside. The cutting device 18 includes a flexible shaft 20 rotated by a rotation mechanism (not shown) installed on the ground, a position maintenance mechanism 22 rotatably attached to the tip or lower end of the shaft, and a position maintenance mechanism 22 rotatably attached to the tip or lower end of the shaft. Cutting mechanism 24 rotatably mounted on the underside of the mechanism
and a plurality of rings 26 rotatably arranged on the flexible shaft 20.

The position maintaining mechanism 22 includes a plurality of jacks that extend and contract in the radial direction of the attachment pipe 12. The cutting mechanism 24 uses the grindstone 2
8, as the flexible shaft 20 rotates, the shaft 1i1
This is a known mechanism that rotates around an axis 30 and revolves around an axis 32.

The cutting device 18 is inserted into the attachment conduit 12 from the ground side. When the grindstone 28 reaches the cutting position 16, the respective jacks of the position maintaining mechanism 22 are activated, thereby preventing the position maintaining mechanism 22 from being displaced with respect to the attached pipe 12, that is, preventing rotational reaction when the cutting mechanism 24 cuts. Attach force to conduit 12
As obtained from, it is maintained. In this state, the flexible l1iIb20 is rotated. As a result, the grindstone 28
Alternatively, it is rotated and revolved to cut the attachment pipe 12 from the inside. The axis of rotation 30 of the grindstone 28 is displaced radially outward as the attachment pipe 12 is cut.

As shown in FIG. 3, the tunnel excavator 34 is then moved forward along the existing pipeline 10 while excavating the existing pipeline 12 and the earth and sand around it, and the new pipeline 14 is laid in the excavation site. .

The tunnel excavator 34 is a shield type tunnel excavator used in the pipe propulsion construction method, and is advanced together with the newly constructed pipeline 14 by a main pushing mechanism based on a plurality of jacks. As the tunnel excavator 34, for example, JP-A-63
A shield type tunnel excavator described in Japanese Patent No. 189593 can be used.

As shown in FIG. 4, a hole 36 approximately the same size as the inner diameter of the attached pipe line 12 is then formed in the newly installed pipe line 14. hole 36
may be formed from within the newly installed conduit 14 using, for example, the apparatus described in JP-A No. 1-222810, or may be formed using the apparatus described in JP-A-1-105897. It may also be formed from the side of the attachment pipe 12.

When forming the hole 36 from inside the newly installed pipeline 14, use the attached pipeline 12 to drill a small hole in the center of the hole to be drilled in the newly installed pipeline, and use this hole as a mark.
Holes 36 can be formed in precise locations.

Next, as shown in FIG. 5, the attached pipe line 12 and the newly installed pipe line 1
4 and are communicated by connecting members 38 and 40.

The connecting member 38 includes a cylindrical portion 38a and a flange portion 38b formed at one end of the cylindrical portion, and is made of a corrosion-resistant material, preferably a shape memory alloy or a shape memory resin. I'm here. The cylindrical portion 38a has an outer diameter that is approximately the same as the inner diameter of the attached conduit 12, and a length that is greater than the distance from the inner surface of the newly installed conduit 14 to the attached conduit 12.

The outer diameter of the flange portion 38b is larger than the inner diameter of the hole 36.

The connecting member 38 has a cylindrical portion 38a inside the hole 36 and II5.
! The flange portion 38b extends inside the attached pipe line 12, and the flange portion 38b is attached to the newly installed pipe line 1.
It is arranged so that it may contact the inner surface of 4. Connection member 38
may be placed from within the newly installed conduit 14, or if made of shape memory alloy or synthetic resin, may be placed from the side of the attached conduit 12.

The connecting member 40 has an extendable hose portion 40a and an elastically deformable flange portion 40b that integrally follows one end of the hose portion. The hose portion 40a has an outer diameter that is approximately the same as the inner diameter of the attachment conduit 12, has a length that is longer than the length of the attachment conduit 12, and is made of thermosetting or photocurable synthetic resin.

The flange portion 40b is the flange portion 38a of the connecting member 38.
The hose portion 40a has an outer diameter larger than the outer diameter of the hose portion 40a.
It has a toughness slightly larger than the thickness dimension. The flange portion 40b is 4i111&! of the hose portion 40a. A plurality of protrusions 42 continuously extending around i1 are provided on the surface opposite to the hose portion 40a.

The connection member 40 has a water stop portion 410 connected to the newly installed pipeline 1 such that the flange portion 40b is located within the newly installed pipeline 14 and the hose portion 40a extends within the connecting member 38 and the attachment pipeline 12.
After the flange portion 40b is inserted into the attachment pipe 12 from inside the connection member 3 or from the upper end side of the attachment pipe 12, the flange portion 40b
8 and the inner surface of the newly installed pipe line 14, it is drawn toward the upper end of the attached pipe line 12.

For example, with the other end of the hose portion 40a closed, the connection member 40 is connected using a fluid such as compressed air until a portion of the hose portion 40a protrudes upward from the attachment conduit 12. By inserting into the installation pipe 12,
It can be placed from within the newly installed conduit 14.

For example, the connecting member 40 is constructed by folding the flange portion 40b to a size that allows it to pass through the attachment pipe 12, and in that state, inserting the flange portion 40b into the attachment pipe 12 using one or more elastically deformable rod-shaped members. The flange portion 40b may be pushed in from the upper end side, and when the flange portion 40b reaches the inside of the newly installed conduit 14, the flange portion 40b may be unfolded.

The liquid tightness between the attached pipe line 12 and the inner surface of the newly installed pipe line 14 is as follows:
For example, the hose portion 40a and flange portion 40a of the connecting member 40 are connected to the attached pipe line 12 and the newly installed pipe line 14, respectively.
It can be maintained by adhering it to the inner surface with an adhesive or the like. In this case, the protrusion 42 is unnecessary.

For example, the connecting member 40 may be constructed by applying a heat-melting adhesive to the outer surfaces of the hose portion 40a and the flange portion 40b, or by impregnating the hose portion 40a and the flange portion 40b with the same type of adhesive, and applying heated air to the connecting member 40. The adhesive is melted by supplying the adhesive, and the hose portion 40a and the flange portion 40b are attached to the attached pipe line 12 and the newly installed pipe line 1, respectively.
It can be glued to 4.

The connecting member 38 is maintained in a predetermined state by maintaining the connecting member 40 in the attached conduit 12 and the newly installed conduit 14 as described above. However, the cylindrical portion 3 of the connecting member 38
8a and the flange portion 38b, respectively, to the attachment pipe 1.
2 and the inner surface of the newly installed conduit 14. Also,
The connecting member 40 may also be adhered to the connecting member 38.

As the adhesive, adhesives other than heat-melting adhesives may be used.

In order to stably maintain liquid tightness between the flange portion 40a of the connecting member 40 and the inner surface of the newly installed pipe line 14 for a long period of time, it is made of a shape memory alloy or a shape that remembers the shape of the inner surface of the newly installed pipe line 14. After the sleeve made of memory resin is placed inside the newly installed conduit 14, the sleeve may be returned to its original shape, thereby pressing the flange portion 40b against the inner surface of the newly installed conduit 14 by the sleeve.

In the illustrated example, a sheet-like base 44 shown in FIG. It will be done. The base 44 includes an elastically deformable L-, -S portion 46 and a plurality of #s formed at one end of the L-base portion.
The engaging portion 48 and a male engaging portion 50 formed at the other end of the base portion 46 and capable of engaging with the female engaging portion 48 are separated.

In the illustrated example, the disengaging and engaging portion 48 has a 7-shaped cross-sectional shape and is made of a long gold J fixed to the base portion 46, and the female engaging portion 50 is formed of a long gold J fixed to the base portion 46. The other end is also slightly bent toward the side opposite to where the female engaging portion 48 is provided.

As shown in FIG. 7, the base 44 is arranged such that the end on the female engagement part 48 side is outside the end on the male engagement part 50 side.
It is rolled into a cylindrical shape. In this state, the base 44 can be expanded in the half-row direction.

As shown in FIG. 8, the base 44 is placed at a predetermined location within the newly installed conduit 14 together with an expander 52 that expands the base 44. The expander 52 includes a shaft portion 54, an expansion portion 56 that is fixed to the shaft portion so as to extend continuously around the shaft portion, and is expanded into a floating ring shape by a pressure fluid such as compressed air. and a nipple 58 for use. As such an expander 52, a water stop valve sold under the trade name Bakker by Toa Grout Kogyo Co., Ltd., one of the applicants of the present invention, can be used.

FIG. 8 shows a state in which the inflatable portion 56 is inflated and the base 44 is expanded in the radial direction.

The expander 52 is placed in the base 44 with the expansion part 56 deflated, and then the base 44 is expanded by pressure fluid supplied from a pressure fluid source provided on the ground to the nipple 58 via a hose. The inflatable portion 56 is inflated to such an extent that it does not displace with respect to the opening device 52, and is moved together with the base 44 to a predetermined position within the newly installed conduit 14.

The shaft portion 54 of the expander 52 has an expansion portion 56 and a nipple 58.
A flow path 60 is formed that communicates with the two.

For example, in the case of a newly constructed pipeline whose size is too large for a worker to enter, the base 44 and the expander 52 pass the lobes from one end of the newly constructed pipeline 14 to the other end, and pass the lobes to the other end of the newly constructed pipeline 14. The lobe can be moved to a predetermined position within the newly installed pipe line 14 by connecting it to the expander 52 on the side thereof and moving the lobe a predetermined distance toward one end of the newly installed pipe line 14. In this case, the TV sigine camera is connected to the expander 52.
It is preferable that the base 44 and the expander 52 be moved while the base 44 and the expander 52 are mounted on the television camera and monitored on a monitor.

Once the base 44 and expander 52 are moved into position, more pressure fluid is supplied to the nipple 58 of the expander 52, causing the expansion section 56 to further expand. As a result, the base 44 is expanded in the radial direction to the extent that both ends of the base portion 46 slightly overlap, that is, to the extent that the male engaging portion 50 can engage with any of the female engaging portions 48 . the result,
The flange portion 40b of the connecting member 40 is pressed against the inner surface of the newly installed pipeline 14 by the base portion 46, and the protruding portion 42 of the flange portion 40b is elastically deformed.

Thereafter, when the pressure fluid in the expansion part 56 is removed, the base 44 is slightly contracted by the restoring force of the protrusion 42 until it engages either the male engagement part 50 or the female engagement part 48. Ru. Therefore, the flange portion 40b is maintained in a state pressed against the inner surface of the newly installed pipeline 14 by the base 44, and the space between the inner surface of the newly installed pipeline 14 and the flange portion 40b is maintained liquid-tight, and the flange portion 40b and The space between the base 44 and the base 44 is maintained airtight.

When the base 44 is used, the base 44 is maintained in the state shown in FIG. , and may be brought to that state by heating air or light. Since the end opening of the hose part 40a on the side of the newly installed conduit 14 is closed by the base 44, the hose part 40a can be expanded in length by supplying compressed air from the other end side, for example.

Thereafter, a hole is formed in the base 44 to communicate the attached pipe line 12 and the newly installed pipe line 14. However, the speaker may be formed in advance.

The thickness of the hose portion 40a, the PJ height of the flange portion 40b, the height of the protruding portion 42, and the thickness of the base 44 are, for example, 0.2 to 5 mm, 1 to 6 mm, 4 to 8 mm, respectively.
and 0.5 to 3 nm.

Preferably, the connecting member 40 is made of a polymeric material such as rubber or synthetic resin. On the other hand, the base 44 is preferably made of a metal material having corrosion resistance, such as stainless steel, copper, or copper alloy.

However, the base 44 may be made of synthetic resin, particularly reinforced plastic.

As shown in FIG. 8, before placing the connecting member 40 and the base 44, a recess 62 is formed on the inner surface of the newly installed conduit 14 to receive the flanges 38b, 40b and the base 44.
It is preferable to form As a result, the flange portion 3
8b, 40b and the base 44 can be prevented from protruding from the inner surface of the newly installed conduit 14.

The protruding portion 42 of the connecting member 40 does not need to be annular as long as it has a shape that elastically deforms when the base 44 is expanded to engage the female engaging portion 48 and the male engaging portion 50 of the base 44. Instead, it may be a large number of protrusions, such as a circular hook shape. Moreover, instead of forming the protruding part on the connecting member 40, the flange part 40
The thickness of b may be increased.

Instead of forming a protrusion on the connecting member 40, a sleeve 64 shown in FIG. 9 may be used. The sleeve 64 is made of an elastically deformable material such as rubber, and the sleeve 64 is made of an elastically deformable material such as rubber.
It has an outer diameter smaller than the inner diameter of 4.

When the sleeve 64 is used, the base 44 is placed inside the sleeve 64 while being rolled into a cylinder as shown in FIG. In this state, the base 44 and the sleeve 64 are placed in the expander 52 shown in FIG.
2 to a predetermined location within the newly installed conduit 14, and is expanded in the radial direction by expanding the expansion portion 56 of the expander 52.

As a result, the sleeve 64, as shown in FIG.
The flange portion 40b of the connecting member 40 is elastically deformed and pressed against the inner surface of the newly installed conduit 14.

When the expansion part 56 of the expander 52 is deflated, the sleeve 64
The base 44 is slightly reduced so that the female engaging portion of the base 44 engages with any of the female engaging portions.

After that, the expander 52 is removed, and the hole connecting the attached pipe line 12 and the newly installed pipe line 14 is opened to the base 44 and the sleeve 6.
4 is formed. Even when the sleeve 64 is used, it is preferable to form a recess 66 on the inner surface of the newly installed conduit 14 in which the flanges 38b, 40b, the sleeve 64, and the base 44 are arranged.

The female engagement portion of the base 44 includes a hole formed in the base portion 46, a tongue piece formed by punching out a part of the base portion 46 from one surface side to the other surface side, and deforming the punched out portion. Other engaging portions, such as, may be used. The male engagement portion may also be another engagement portion such as a protrusion.

The connecting member 38, when the connecting member 38, 40 is arranged as shown in FIG. 5, FIG. 8 or FIG.
It acts as a reinforcing material for the connecting member 40. However, when the mechanical strength of the connecting member is high, the connecting member 38 may not be used.

The present invention is suitable as a method for renewing pipelines that cannot be entered by workers, or can be applied to methods for renewing pipelines that workers can enter.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of an existing pipe line updated according to the present invention, FIG. 2 is a cross-sectional view showing an example of a device for cutting an attached pipe line, and FIG. A cross-sectional view showing the state in which the earth and sand around it are being excavated by an excavator, No. 4
The figure is a cross-sectional view showing the positional relationship between the attached pipe line and the hole formed in the new pipe line, Figure 5 is a cross-sectional view showing the state where the attached pipe line and the new pipe line are connected by a connecting member, and Figure 6 7 is a perspective view showing an embodiment of the base, FIG. 7 is a perspective view showing the base rolled into a tube shape, and FIG. 8 is a conduit equipped with the heel of FIG. 6 as an expander for the base. FIG. 9 is a perspective view of the combination of the sleeve and base, and FIG.
It is a sectional view showing a state where the sleeve and base of the figure are arranged in a new pipe line. IO: Existing pipeline, 12: Installed pipeline, 14: New pipeline, 16. Cutting position, 18: Cutting device, 34 Shield type tunnel excavator, 38.40 Connection member, 40a: Hose part, 40b
Flange part, 42・Protrusion part, 44・Base,
46: Base part, 48: Female engaging part, 50.
Female engaging portion, 52, expander, 62.66: recess, 64° sleeve.

Claims (1)

[Claims] (1) A method of renewing a pipeline by removing an existing pipeline buried underground and laying a new pipeline in its place, the method comprising connecting to the existing pipeline. cutting the attached pipe line at the end on the side of the existing pipe line to separate it from the existing pipe line, and moving the tunnel excavation machine forward along the existing pipe line to excavate the existing pipe line. A method of renewing pipelines that involves removing them by excavating them with a machine and laying new pipelines in their place. (2) Claim (1) further comprising: drilling a hole in the newly installed pipeline, and arranging an impermeable connecting means for communicating the newly installed pipeline and the attached pipeline through the hole. Update method described in. (3) The connecting means has an expandable hose portion and a flange portion that integrally continues to one end of the hose portion, and the connecting means is connected to the hose portion so that the flange portion is within the newly constructed conduit and the hose portion is connected to the hose portion. is arranged in the new pipe line and the attached pipe line so that the flange part is in fluid-tight contact with the inner surface of the new pipe line, and the hose part is in the attached pipe line. The updating method according to claim 2, wherein the connecting means is maintained so as to extend within the road. (4) A sheet-like base wound into a tube shape so as to be expandable in the radial direction is placed in the newly constructed pipe, and the base is expanded in the radial direction to allow the flange portion to be attached to the newly constructed pipe by the base. The base is maintained in an expanded state by pressing against the inner surface of the conduit and a plurality of engaging portions provided on the base are engaged with each other, whereby the flange portion is pressed against the inner surface of the newly installed conduit. The renewal method according to claim 3, wherein the renewal method is maintained in a state of being in liquid-tight contact with. (5) The method according to claim (4) further includes forming a recess in which at least the flange portion and the base are to be placed in the inner surface of the newly installed conduit prior to arranging the connecting means and the base. How to update the information. (6) Further, an elastically deformable sleeve and a sheet-like base disposed within the sleeve in a radially expandable cylindrical shape are disposed within the newly constructed conduit, The base is expanded in the radial direction, the flange portion is pressed against the inner surface of the newly installed pipeline by the base and the sleeve, and the plurality of engaging portions provided on the base are engaged with each other to open the base. keep it expanded,
The renewal method according to claim 3, wherein the flange portion is maintained in a state in which it is in liquid-tight contact with the inner surface of the newly installed pipeline. (7) Furthermore, prior to arranging the connecting means, the sleeve, and the base, a recess in which the flange portion, the sleeve, and the base are arranged is formed in the inner surface of the newly installed conduit. ). (8) After placing a sleeve made of at least one of a shape memory alloy and a shape memory resin that memorizes the shape of the inner surface of the newly installed pipe into the newly installed pipe, the sleeve is returned to its original shape. 4. The renewal method according to claim 3, wherein the flange portion is maintained in a state in which it is in liquid-tight contact with the inner surface of the newly installed pipeline by the sleeve.