CA1326600C - Method of pipe replacement - Google Patents
Method of pipe replacementInfo
- Publication number
- CA1326600C CA1326600C CA 580575 CA580575A CA1326600C CA 1326600 C CA1326600 C CA 1326600C CA 580575 CA580575 CA 580575 CA 580575 A CA580575 A CA 580575A CA 1326600 C CA1326600 C CA 1326600C
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- mole
- bursting
- old
- new
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000009172 bursting Effects 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 102100034742 Rotatin Human genes 0.000 description 1
- 101710200213 Rotatin Proteins 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/14—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
- E21B7/205—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes without earth removal
- E21B7/206—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes without earth removal using down-hole drives
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
- E21B7/30—Enlarging drilled holes, e.g. by counterboring without earth removal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
- F16L55/1658—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the old pipe being ruptured prior to insertion of a new pipe
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method of replacing an old pipe with a new pipe comprising the steps of attaching the new pipe to the rear of a bursting mole having a cylindrical body whose external diameter is larger than the diameter . of the old pipe, and pulling the bursting mole and the new pipe forward by means of a traction cable so that a head of the bursting mole intrudes into the old pipe and bursts it so as to form an enlarged space for the new pipe, the method further comprising a step of temporarily detaching a longitudinal portion of a pipe section in order to pass an air hose through the pipe section without disconnecting the hose from the bursting mole.
A method of replacing an old pipe with a new pipe comprising the steps of attaching the new pipe to the rear of a bursting mole having a cylindrical body whose external diameter is larger than the diameter . of the old pipe, and pulling the bursting mole and the new pipe forward by means of a traction cable so that a head of the bursting mole intrudes into the old pipe and bursts it so as to form an enlarged space for the new pipe, the method further comprising a step of temporarily detaching a longitudinal portion of a pipe section in order to pass an air hose through the pipe section without disconnecting the hose from the bursting mole.
Description
"Method and apparatus :Eor pipe replacemen-t"
THIS INVENTION relates to a method and apparatus for replacing an existing old pipe, such as a water service pipe, gas pipe or the like with a new pipe and, in particwlar, to a method and apparatus for replacing an old pipe ~ith a new one - . .
without digging up the ground.
,:
When an old buried pipe, in particular a cast iron pipe, has deteriorated with age or when it is necessary to replace the old pipe with a new one due to new requirements, it is desirable to be able to replace the old pipe with a new one without digging up the ground, because great labour and cost is involved in excavating the old pipe and because such -digging work unavoidably obstructs traffic or affects means of transport and communication.
According to a known method of pipe replacement called : , - -"pipe-in-pipe", a new pipe is simply inserted into the old -- :
one under the ground. However, this ineYitably means that the internal diameter of the new pipe must be smaller than ~ 20 that of the old pipe, resulting in a reduction in the ; capacity for transporting gas or water.
-- 1 -- . ;, ' " ~' :.
:., ~"
~ 326600 An attempt has already been made to overcome -the above discussed drawback of the "pipe-in-pipe" method, aæ disclosed in U.K. Patent GB2152624B "Pipe Replacement Sys~em", GB ~-2124325B and GB 2092701B "Mains Insertion". ~:
The aforesaid prior art discloses a method and an apparatus for pi.pe replacement in which a new pipe is attached to the rear end of a bursting mole having a cylindrical body with an external diameter which ix larger -than that of the old pipe to be replaced. The bursting mole 1~ and the new pipe move forward together, and a front end or head of the bursting mole intrudes into the old pipe and progressively bursts the old pipe to form an enlarged space to receive the new pipe, so that the old pipe is replaced with the new one.
In the aforementioned convent1onal method, however, a : large working space is required in a rear portion of the starting pit. The pipe line is usually laid under a road, ; and it i~ an obstacle to traffic to secure such ~ large :~
working ~pace. Moreover, in the prior art it is necessary to ~ move~:a compressor following each forward movement of the bursting mole. In order to continue the work without moving the~compreasor;, it would be necessary to connect a longer air hose;~extending at least 1.5 times the length from the startlng plt to the destlnation p1tF whlch results~in a 2;5:~ ~ lowerlng of the air supply efficiency.
~: ~: : : : , .
2 ~
`'::
.'~:
It is indeed possible to reduce the working space by forming a pipe line by joining specific lengths of new pipe together sequentially according to the forward movement of the mole. However, in such an arrangeMent, the air supply to the mole during the replacement work is frequently interrupted as new pipe sections are added and the air hoses are extended (detached and rejoined). This is a lengthy process and considerably lowers the efficiency of the process. Moreover, as the air hose inserted through the new pipe has many couplings, the air supply efficiency is also lowered and there is a possibility of damage to the ~:~
internal sur~ace of the new pipe and the cost of replacing the pipe is high due to the use of many expensive couplings.
The present invention aiims to overcome or~ at least, mitigate the above di~cussed pro~lems and to provide a method of replacing an old buried pipe with a new pipe in which the required working space is reduced and the ~ .~'',..
replacement is carried out without interruption.
Accordingly, in one aspect, the invention provides a -;.
method of replacing an old buried pipe with a new pipe :~ comprising a: plurality of pipe sections, which method ::;
comprise3 attaching successive new pipe sections to a : bursting mole having a oylindrical body whose external 25~: diameter is larger than the existing old pipe, and moving --the bursting mole forward so that a head of the bur~ting ~:~ ~3~
: ' .:
mole intrudes into the old pipe and bursts it -to provide an enlarged space for the new pipe following the bursting mole, which method further includes supplying power to a driving means carried by the bursting ~ole through a power line from a power source and temporarily detaching a longitudinal portion of each successive pipe section in order to introduce the power line into the pipe sections without disconnecting the line from the bursting mole.
In another aspect, the invention provides an apparatus for replacing an old buried pip~ with ~ new pipe compri~ing a plurality of pipe section~, which apparatus comprises a bur~ting mole having a cylindrical body with an external diameter which is larger than the existing old pipe, means for attaching ~ucce~sive pipe sections to the bursting ~ :
mole, a power ~ource for ~upplying power through a power line to a driving means carried by the bur~ting mole to mo~e the bursting mole forward ~o that a head of the mole intrude~ into the old pipe and .burst~ it, and means for attaching succe~æive pipe section~ behind the bur~ting mole wherein each pipe ~ection is adapted to be coupled to a preceding pipe section aæ the mole advances and is pro~ided with a detaFhable section defining a longitudinal ~- detachable portion extending the length of the pipe section ~-: which can be temporarily detached from the pipe section in 25 order to introduce the power line into the pipe section . .
without di~connecting the power line from the bursting : mole.
: ~ ~4~ ~-~
~ ~: '','~, . .
1 3~6600 In order that the invention may be more readily understood, embodiments thereof, and the prior ar-t, wi~l now be described by way of example with reference to the accompanying drawings, in which: : :
'~
Figure lA is a diagrammatic side view of a pipe section having a detachable portion for use in a method embodying the ' present invention;
^, Figure lB is a diagrammatic end view of the pipe section of Figure 1 with the detachable portion disconnected; .
'.: .
Figure lC is an enlarged fragmentary view of the connection between the detachable portion o the pipe ~ection of Figure 1:
i.
Figure 2 is an enlarged view of the pipe section and detachable portion shown in Figure lC, with a resilient ;:
lS sealing member inserted between the plpe section and the : detachable portion;
Figure 3A~is a diagrammatic sectional view illustrating :.-a method embodylng the present inventlon;
Figurè~3B~:(a), ~b), (c) and ~d~ are sectional views of 20 ~ :sequentlal steps aarried out in the method~of Figure 3A;
Figure 3C is a further diagramma-tic sectional view illustrating the me-thod embodying the present invention; ~.
Figures 4-6 are diagrammatic sectional views illustrating apparatus used in a prior art pipe replacing method;
Figure 7 is a diagrammatic sectional view illustrating a prior art pipe replacement method embodying the apparatus of Figures 4 to 6; and Figure 8 is a diagrammatic sectional view illustrating a further prior ark pipe replacement method.
The prior art is illustrated in F'igures 4 to 8. Figures 4 to 6 show prior art apparatus and Figure 7 illustrates a manner of actual use of this prior apparatusi, which is taken : from:a catalogue explaining the practical use of the apparatus on a commercial basis, and Figure 8 illustrates a method based on an improvement of the method of Figure 7. :. :
: . .
~ An embodiment of prior art apparatus will now be :-:
, .: . .
: sipecifically described with reference to Figures 4 to 6. .~ . - - -, ~ : : . .
. - ~ : - -.
The bursting mole 8a comprises a front section which .~
20~ ~intrudes into the oId pipe ll~a and ~ursts the wall thereof, . ~.
an~ a rear section which is connected to the new pipe la to ., ~ tow the new pipe behind the bursting mole O
'' ' The front section of the mole has a head 14a wi-th cutting blades 13a thereon, and a front end of the head is drawn forward by a winch (not illustrated) by way of a .
traction cable lOa which is passed through the old pipe~
, '' .
Cutting edge~ 15a are proYided on the blades 13a, and at least one blade can be pivoted outwardly from the bur~ting mole in order to cut the wall of the old pipe.
.
.
~ ~n Figure 5, a ~luid prei~isure hose 12a extendiny -. forwardly through the old pipe delivers a pressure fluid to actuate a piston 16a provided in the head of the bursting mole. The pi~ton, in turn, act~i on blade 13a to pivot it outwardly thereby to Cllt the wall to form an enlarged space for the new pipe following behind the mole 8a.
,~
Forward movement of the bursting mole together with ~-the attached new pipe is perfor~ed by an air hammer 17a , di~posed in a hollow siection of the cylindrical bocly of the : bursting mole as illustrated in Figure 6. The piston in the air hammer ~lides back and forth in response to pressurized -::
air clelivered through an air hose attached to the rear end, ..
~0 and additlonally by winching through the cable attachecl to the front end of the burstin~ mole. Additionally, a hydraulic jacking device may ~e provided to apply further pre~sure to the rear end of the new pipe a~i disclosed by ; the Appllcant ln Japanese Patent Application No. 61-1591B4 whiah was published as unexamined application 63-139B7.
`;~ : : -' ~ "
~ "' ,''',' .
....
In practice, an air hoæe 9a for supplying air to the hammer 17a and incorporated .inside the head of the mole, is joined to the rear of the mole by suitahle means. An oil -feed pipe for supplying oil under pressure to the head for f 5 rotatin~ th~ blades 13a may also be joined to the rear of . the mole 8a.
:
When a new pipe section is joined to the pipe sections behind the bur~.ting mole, the hoses have to be inserted through the pipe section as typically illustrated in Figure 10 7.
Turning to the invention and ref Prring first to Figure f' 3A, in order to replace an old bwried pipe 11 with a new pipe 1, a bursting mole 8 iæ positioned at one end of the old pipe line. To thi~ end~ a ~tartin~ pit 4 i~ dug in the 15 ground over a length suf~icient to expose one end of the old pipe line to be replaced and to accommodate related equipment and tools.
:~
;~
One end of a traction cable 10 is passed through the ~-old pipe 1 and i~ attached to a front end of the bursting ..
mole 8 0 The cable 10 is attached at its other end to a winch ~not shown) which pulls the bursting mole into the -~-~ : .
: : oId:pipe to burst it and replace it with the new pipe 1 : fvllowing behind the mole 8. Since the external diameter of ~he cyllndrical section of the burstin~ mole is larger -.;
25 than that of the old pipe, a space lincluding ~ragmentis of :
8~
~ : ., .
f ~ JnB,' ~:,~ ,' . .
,~ :
the old pipe~ larger than the old pipe is formed by the s bursting mole to accommodate the new pipe attached to the .. ~
I rear end of the mole 8.
- .
In the method illustrated in Figure 3A, the new pipe 1 is in the form of short pipe sections. As shown in Figures 1 tA3, ~B) and (C), each pipe section 1 is provided with a lonyitudinal detachable portion 6 constituting a removable part of the periphery o the pipe in parallel to the axial direction thereof~ In the example illustrated~ stepped portions 7 are provided on the edges of the longitudinal '~ detachable portion 6 which engage with correspondingly stepped portions 7 provided in the periphery of the pipe lo ,' , Each of the stepped portions 7 of the pipe ~ection 1 and the detachable portion 6 are pxovided with aligned bores 7a. The bores are provided with an internal ~crew thread 7b. The ~tepped portion~ 7 of the pipe ~ection 1 and the detachable portion 6 are secured together by a ~crew 5 (or , ~ other faætening member such as a bolt) having a shaf~
provlded with a ~crew thread corresponding to that provided -in the bore~ 7a. A re~ilient sealing member 18 (as shown in Flgure 2~ in the form of a rubber ætrip i~ interposed between the stepped portionx 7 to provide a satisfactory .~ . .
.~ .: :
~ eal between the pipe section 1 and the detachable portion ,~
. ~ . . :
THIS INVENTION relates to a method and apparatus for replacing an existing old pipe, such as a water service pipe, gas pipe or the like with a new pipe and, in particwlar, to a method and apparatus for replacing an old pipe ~ith a new one - . .
without digging up the ground.
,:
When an old buried pipe, in particular a cast iron pipe, has deteriorated with age or when it is necessary to replace the old pipe with a new one due to new requirements, it is desirable to be able to replace the old pipe with a new one without digging up the ground, because great labour and cost is involved in excavating the old pipe and because such -digging work unavoidably obstructs traffic or affects means of transport and communication.
According to a known method of pipe replacement called : , - -"pipe-in-pipe", a new pipe is simply inserted into the old -- :
one under the ground. However, this ineYitably means that the internal diameter of the new pipe must be smaller than ~ 20 that of the old pipe, resulting in a reduction in the ; capacity for transporting gas or water.
-- 1 -- . ;, ' " ~' :.
:., ~"
~ 326600 An attempt has already been made to overcome -the above discussed drawback of the "pipe-in-pipe" method, aæ disclosed in U.K. Patent GB2152624B "Pipe Replacement Sys~em", GB ~-2124325B and GB 2092701B "Mains Insertion". ~:
The aforesaid prior art discloses a method and an apparatus for pi.pe replacement in which a new pipe is attached to the rear end of a bursting mole having a cylindrical body with an external diameter which ix larger -than that of the old pipe to be replaced. The bursting mole 1~ and the new pipe move forward together, and a front end or head of the bursting mole intrudes into the old pipe and progressively bursts the old pipe to form an enlarged space to receive the new pipe, so that the old pipe is replaced with the new one.
In the aforementioned convent1onal method, however, a : large working space is required in a rear portion of the starting pit. The pipe line is usually laid under a road, ; and it i~ an obstacle to traffic to secure such ~ large :~
working ~pace. Moreover, in the prior art it is necessary to ~ move~:a compressor following each forward movement of the bursting mole. In order to continue the work without moving the~compreasor;, it would be necessary to connect a longer air hose;~extending at least 1.5 times the length from the startlng plt to the destlnation p1tF whlch results~in a 2;5:~ ~ lowerlng of the air supply efficiency.
~: ~: : : : , .
2 ~
`'::
.'~:
It is indeed possible to reduce the working space by forming a pipe line by joining specific lengths of new pipe together sequentially according to the forward movement of the mole. However, in such an arrangeMent, the air supply to the mole during the replacement work is frequently interrupted as new pipe sections are added and the air hoses are extended (detached and rejoined). This is a lengthy process and considerably lowers the efficiency of the process. Moreover, as the air hose inserted through the new pipe has many couplings, the air supply efficiency is also lowered and there is a possibility of damage to the ~:~
internal sur~ace of the new pipe and the cost of replacing the pipe is high due to the use of many expensive couplings.
The present invention aiims to overcome or~ at least, mitigate the above di~cussed pro~lems and to provide a method of replacing an old buried pipe with a new pipe in which the required working space is reduced and the ~ .~'',..
replacement is carried out without interruption.
Accordingly, in one aspect, the invention provides a -;.
method of replacing an old buried pipe with a new pipe :~ comprising a: plurality of pipe sections, which method ::;
comprise3 attaching successive new pipe sections to a : bursting mole having a oylindrical body whose external 25~: diameter is larger than the existing old pipe, and moving --the bursting mole forward so that a head of the bur~ting ~:~ ~3~
: ' .:
mole intrudes into the old pipe and bursts it -to provide an enlarged space for the new pipe following the bursting mole, which method further includes supplying power to a driving means carried by the bursting ~ole through a power line from a power source and temporarily detaching a longitudinal portion of each successive pipe section in order to introduce the power line into the pipe sections without disconnecting the line from the bursting mole.
In another aspect, the invention provides an apparatus for replacing an old buried pip~ with ~ new pipe compri~ing a plurality of pipe section~, which apparatus comprises a bur~ting mole having a cylindrical body with an external diameter which is larger than the existing old pipe, means for attaching ~ucce~sive pipe sections to the bursting ~ :
mole, a power ~ource for ~upplying power through a power line to a driving means carried by the bur~ting mole to mo~e the bursting mole forward ~o that a head of the mole intrude~ into the old pipe and .burst~ it, and means for attaching succe~æive pipe section~ behind the bur~ting mole wherein each pipe ~ection is adapted to be coupled to a preceding pipe section aæ the mole advances and is pro~ided with a detaFhable section defining a longitudinal ~- detachable portion extending the length of the pipe section ~-: which can be temporarily detached from the pipe section in 25 order to introduce the power line into the pipe section . .
without di~connecting the power line from the bursting : mole.
: ~ ~4~ ~-~
~ ~: '','~, . .
1 3~6600 In order that the invention may be more readily understood, embodiments thereof, and the prior ar-t, wi~l now be described by way of example with reference to the accompanying drawings, in which: : :
'~
Figure lA is a diagrammatic side view of a pipe section having a detachable portion for use in a method embodying the ' present invention;
^, Figure lB is a diagrammatic end view of the pipe section of Figure 1 with the detachable portion disconnected; .
'.: .
Figure lC is an enlarged fragmentary view of the connection between the detachable portion o the pipe ~ection of Figure 1:
i.
Figure 2 is an enlarged view of the pipe section and detachable portion shown in Figure lC, with a resilient ;:
lS sealing member inserted between the plpe section and the : detachable portion;
Figure 3A~is a diagrammatic sectional view illustrating :.-a method embodylng the present inventlon;
Figurè~3B~:(a), ~b), (c) and ~d~ are sectional views of 20 ~ :sequentlal steps aarried out in the method~of Figure 3A;
Figure 3C is a further diagramma-tic sectional view illustrating the me-thod embodying the present invention; ~.
Figures 4-6 are diagrammatic sectional views illustrating apparatus used in a prior art pipe replacing method;
Figure 7 is a diagrammatic sectional view illustrating a prior art pipe replacement method embodying the apparatus of Figures 4 to 6; and Figure 8 is a diagrammatic sectional view illustrating a further prior ark pipe replacement method.
The prior art is illustrated in F'igures 4 to 8. Figures 4 to 6 show prior art apparatus and Figure 7 illustrates a manner of actual use of this prior apparatusi, which is taken : from:a catalogue explaining the practical use of the apparatus on a commercial basis, and Figure 8 illustrates a method based on an improvement of the method of Figure 7. :. :
: . .
~ An embodiment of prior art apparatus will now be :-:
, .: . .
: sipecifically described with reference to Figures 4 to 6. .~ . - - -, ~ : : . .
. - ~ : - -.
The bursting mole 8a comprises a front section which .~
20~ ~intrudes into the oId pipe ll~a and ~ursts the wall thereof, . ~.
an~ a rear section which is connected to the new pipe la to ., ~ tow the new pipe behind the bursting mole O
'' ' The front section of the mole has a head 14a wi-th cutting blades 13a thereon, and a front end of the head is drawn forward by a winch (not illustrated) by way of a .
traction cable lOa which is passed through the old pipe~
, '' .
Cutting edge~ 15a are proYided on the blades 13a, and at least one blade can be pivoted outwardly from the bur~ting mole in order to cut the wall of the old pipe.
.
.
~ ~n Figure 5, a ~luid prei~isure hose 12a extendiny -. forwardly through the old pipe delivers a pressure fluid to actuate a piston 16a provided in the head of the bursting mole. The pi~ton, in turn, act~i on blade 13a to pivot it outwardly thereby to Cllt the wall to form an enlarged space for the new pipe following behind the mole 8a.
,~
Forward movement of the bursting mole together with ~-the attached new pipe is perfor~ed by an air hammer 17a , di~posed in a hollow siection of the cylindrical bocly of the : bursting mole as illustrated in Figure 6. The piston in the air hammer ~lides back and forth in response to pressurized -::
air clelivered through an air hose attached to the rear end, ..
~0 and additlonally by winching through the cable attachecl to the front end of the burstin~ mole. Additionally, a hydraulic jacking device may ~e provided to apply further pre~sure to the rear end of the new pipe a~i disclosed by ; the Appllcant ln Japanese Patent Application No. 61-1591B4 whiah was published as unexamined application 63-139B7.
`;~ : : -' ~ "
~ "' ,''',' .
....
In practice, an air hoæe 9a for supplying air to the hammer 17a and incorporated .inside the head of the mole, is joined to the rear of the mole by suitahle means. An oil -feed pipe for supplying oil under pressure to the head for f 5 rotatin~ th~ blades 13a may also be joined to the rear of . the mole 8a.
:
When a new pipe section is joined to the pipe sections behind the bur~.ting mole, the hoses have to be inserted through the pipe section as typically illustrated in Figure 10 7.
Turning to the invention and ref Prring first to Figure f' 3A, in order to replace an old bwried pipe 11 with a new pipe 1, a bursting mole 8 iæ positioned at one end of the old pipe line. To thi~ end~ a ~tartin~ pit 4 i~ dug in the 15 ground over a length suf~icient to expose one end of the old pipe line to be replaced and to accommodate related equipment and tools.
:~
;~
One end of a traction cable 10 is passed through the ~-old pipe 1 and i~ attached to a front end of the bursting ..
mole 8 0 The cable 10 is attached at its other end to a winch ~not shown) which pulls the bursting mole into the -~-~ : .
: : oId:pipe to burst it and replace it with the new pipe 1 : fvllowing behind the mole 8. Since the external diameter of ~he cyllndrical section of the burstin~ mole is larger -.;
25 than that of the old pipe, a space lincluding ~ragmentis of :
8~
~ : ., .
f ~ JnB,' ~:,~ ,' . .
,~ :
the old pipe~ larger than the old pipe is formed by the s bursting mole to accommodate the new pipe attached to the .. ~
I rear end of the mole 8.
- .
In the method illustrated in Figure 3A, the new pipe 1 is in the form of short pipe sections. As shown in Figures 1 tA3, ~B) and (C), each pipe section 1 is provided with a lonyitudinal detachable portion 6 constituting a removable part of the periphery o the pipe in parallel to the axial direction thereof~ In the example illustrated~ stepped portions 7 are provided on the edges of the longitudinal '~ detachable portion 6 which engage with correspondingly stepped portions 7 provided in the periphery of the pipe lo ,' , Each of the stepped portions 7 of the pipe ~ection 1 and the detachable portion 6 are pxovided with aligned bores 7a. The bores are provided with an internal ~crew thread 7b. The ~tepped portion~ 7 of the pipe ~ection 1 and the detachable portion 6 are secured together by a ~crew 5 (or , ~ other faætening member such as a bolt) having a shaf~
provlded with a ~crew thread corresponding to that provided -in the bore~ 7a. A re~ilient sealing member 18 (as shown in Flgure 2~ in the form of a rubber ætrip i~ interposed between the stepped portionx 7 to provide a satisfactory .~ . .
.~ .: :
~ eal between the pipe section 1 and the detachable portion ,~
. ~ . . :
3 ~ 25 ~ Fi~ures 3A-C Illuætrate~the proce~ of formin~ a new ~ ~
.1~ ~ :.:
~' :
"' ~ '':''.:
pipe line by joining together individual pipe seckions 1.
Each pipe section includes, as shown in Figu~e lA, a recess lb at one end and a collar lc at the other end. This design allows easy joining of successive sections.
," ..
, 5 The steps involved in the illustrated pipe ,, .
~ replacement method a.re as follo~J~: -:,i., :
: 1. A power line (in the form of an air hose~ 9 ex-tending : -from a power source 19 (in the form of a ~ompressor) for driving the mole is joined to the ret~r thereof and a cable , 6l i; lO 10 extending from a winch ~not shown) is joined to the `~i ~ front of ~ole 8. The mole 8 is then mo~ed forward with the . 1l ~ tip end o~ the mole intruding .into the old pipe 11 and the ~1 .
old pipe is burit by the ~ole 8. The air hose g supplies compresil3ed air to a driviny mean~ (in the form of an air :-hammer) incorporated in the head of the mole, thereby advancing the mole ~ into the space vacated by the old pipe . 110 ~'~
. ~ 2. Ais illustrated in Figure~ 3B la) to ~d)~ the longitudinal detachable portion 6 is removed from a pipe sect~on l to be joined to the rear of the mole 8. The air hoae 9 is then inserted into the new pipe and the longltudinal de~aahable portion ~ is secured in place in the periphery of the pipe 1 by the screw 5. The mole and the new pipe section ~ are integrally se~ured to each other : 25 by suita~le mean~, ~uch~a wire, to form a sealed 1 0- " ~. .
:~: : : .
, ~
~ 3~6600 ~ connection. Furthermore, as shown in ~igure 3C, the mole 8 , :, f and the new pipe section 1 are moved forward together into Z the space formed by the burst old pipe 11. The air hose 9 is alternately let out and rewound fro~ a hose reel 20 when a pipe section 1 is to be fi-tted to the new pipe line.
:
The air hose 9 is then inserted into a new pipe ection 1 which is then joined in the same manner as , . .
above to the rear end of the preceding pipe section whereby the extension from the ~tarting pit to the destination pit 10 i~ easily and neatly achieved.
~J
,~ ..
By the abo~e procesæ, pipe ~ection~ can be added to the new pipeline without interrupting the air supply to the f bursting mole~ -'. '''.' A method according to the present invention allow~
15 replacement work to be efficierltly carried out even when the starting pit is narrow and has a relatively small working area.
3~
i~ A method according to the pre~ent invention results in, among other things, the reduction of working ~pace, 20 shortening of working t]me, omission of certain working in truments, protection of the internal surfaces of the new pipes and an improvement in the efficiency of air supply to j~ the ~ursting mole.
: ~,J~
The new pipe may be either a replacemen-t pipe for the old pipe or a ~heath for the replacement pipe.
.,j. :
~ , .
,~, , ~,.
,~ ' .
' ~
.::
~
,~
:
,'",:
'.~ ' .,, :: ~
.1~ ~ :.:
~' :
"' ~ '':''.:
pipe line by joining together individual pipe seckions 1.
Each pipe section includes, as shown in Figu~e lA, a recess lb at one end and a collar lc at the other end. This design allows easy joining of successive sections.
," ..
, 5 The steps involved in the illustrated pipe ,, .
~ replacement method a.re as follo~J~: -:,i., :
: 1. A power line (in the form of an air hose~ 9 ex-tending : -from a power source 19 (in the form of a ~ompressor) for driving the mole is joined to the ret~r thereof and a cable , 6l i; lO 10 extending from a winch ~not shown) is joined to the `~i ~ front of ~ole 8. The mole 8 is then mo~ed forward with the . 1l ~ tip end o~ the mole intruding .into the old pipe 11 and the ~1 .
old pipe is burit by the ~ole 8. The air hose g supplies compresil3ed air to a driviny mean~ (in the form of an air :-hammer) incorporated in the head of the mole, thereby advancing the mole ~ into the space vacated by the old pipe . 110 ~'~
. ~ 2. Ais illustrated in Figure~ 3B la) to ~d)~ the longitudinal detachable portion 6 is removed from a pipe sect~on l to be joined to the rear of the mole 8. The air hoae 9 is then inserted into the new pipe and the longltudinal de~aahable portion ~ is secured in place in the periphery of the pipe 1 by the screw 5. The mole and the new pipe section ~ are integrally se~ured to each other : 25 by suita~le mean~, ~uch~a wire, to form a sealed 1 0- " ~. .
:~: : : .
, ~
~ 3~6600 ~ connection. Furthermore, as shown in ~igure 3C, the mole 8 , :, f and the new pipe section 1 are moved forward together into Z the space formed by the burst old pipe 11. The air hose 9 is alternately let out and rewound fro~ a hose reel 20 when a pipe section 1 is to be fi-tted to the new pipe line.
:
The air hose 9 is then inserted into a new pipe ection 1 which is then joined in the same manner as , . .
above to the rear end of the preceding pipe section whereby the extension from the ~tarting pit to the destination pit 10 i~ easily and neatly achieved.
~J
,~ ..
By the abo~e procesæ, pipe ~ection~ can be added to the new pipeline without interrupting the air supply to the f bursting mole~ -'. '''.' A method according to the present invention allow~
15 replacement work to be efficierltly carried out even when the starting pit is narrow and has a relatively small working area.
3~
i~ A method according to the pre~ent invention results in, among other things, the reduction of working ~pace, 20 shortening of working t]me, omission of certain working in truments, protection of the internal surfaces of the new pipes and an improvement in the efficiency of air supply to j~ the ~ursting mole.
: ~,J~
The new pipe may be either a replacemen-t pipe for the old pipe or a ~heath for the replacement pipe.
.,j. :
~ , .
,~, , ~,.
,~ ' .
' ~
.::
~
,~
:
,'",:
'.~ ' .,, :: ~
Claims (6)
1. A method of replacing an old buried pipe with a new pipe comprising a plurality of pipe sections, which method comprises attaching successive new pipe sections to a bursting mole having a cylindrical body whose external diameter is larger than the existing old pipe, and moving the bursting mole forward so that a head of the bursting mole intrudes into the old pipe and bursts it to provide an enlarged space for the new pipe following the bursting mole, which method further includes supplying power to a driving means carried by the bursting mole through a power line from a power source and temporarily detaching a longitudinal portion of each successive pipe section in order to introduce the power line into the pipe sections without disconnecting the line from the bursting mole.
2. A method according to claim 1, wherein the method further comprises forming the new pipe from a plurality of short pipe sections having a strength able to endure the application of the compressive force and connecting the pipe sections to one another in a starting pit.
3. Apparatus for replacing an old buried pipe with a new pipe comprising a plurality of pipe sections, which apparatus comprises, a bursting mole having a cylindrical body with an external diameter which is larger than the existing old pipe, means for attaching successive pipe sections to the bursting mole, a power source for supplying power through a power line to a driving means carried by the bursting mole to move the bursting mole forward so that a head of the mole intrudes into the old pipe and bursts it, and means for attaching successive pipe sections behind bursting mole wherein each pipe section is adapted to be coupled to a preceding pipe section as the mole advances and is provided with a detachable section defining a longitudinal detachable portion extending the length of the pipe section which can be temporarily detached from the pipe section in order to introduce the power line into the pipe section without disconnecting the power line from the bursting mole.
4. Apparatus according to claim 3, wherein each pipe section and related detachable portion are provided with correspondingly shaped stepped portions.
5. Apparatus according to claim 4, wherein the stepped portions are secured together by a fastening member.
6. Apparatus according to claim 4 or 5, wherein a resilient sealing member is interposed between the stepped portions in order to provide a seal between the pipe section and the related detachable portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62310350A JPH01150087A (en) | 1987-12-07 | 1987-12-07 | Method of replacing existing main pipe with novel main pipe |
| JP62-310350 | 1987-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1326600C true CA1326600C (en) | 1994-02-01 |
Family
ID=18004177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 580575 Expired - Fee Related CA1326600C (en) | 1987-12-07 | 1988-10-19 | Method of pipe replacement |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH01150087A (en) |
| CA (1) | CA1326600C (en) |
| DE (1) | DE3835900C2 (en) |
| GB (1) | GB2213229B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992014089A1 (en) * | 1991-02-12 | 1992-08-20 | Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr | Device for trench-free replacing of pipelines |
| FR2684411A1 (en) * | 1991-12-02 | 1993-06-04 | Inst Francais Du Petrole | Detachable connector with lateral exit, method of positioning the cable and use for measurements in a well |
| DE4421923A1 (en) * | 1994-06-26 | 1996-01-04 | Preussag Anlagenbau | Method and device for replacing a pipeline buried in the ground |
| EP2757296A1 (en) * | 2013-01-22 | 2014-07-23 | Scandinavian No-Dig Centre ApS | Method and system for replacement of existing pipes. |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB515703A (en) * | 1938-06-09 | 1939-12-12 | Metal Trim Ltd | Improvements in or relating to protective casings more particularly for electric cables |
| GB571714A (en) * | 1944-01-31 | 1945-09-05 | Frederick Braby & Company Ltd | Improvements in and relating to sectional sheet-metal culverts |
| GB1216181A (en) * | 1966-09-29 | 1970-12-16 | Jeffrey Walton | Improvements in or relating to conduits |
| DE2236018A1 (en) * | 1972-07-19 | 1974-01-31 | Siemens Ag | PROTECTIVE TUBE FOR SINGLE-LINE HIGH VOLTAGE CABLE |
| GB2026781B (en) * | 1978-07-28 | 1982-09-08 | Happer Systems Ltd | Below surface ducting |
| DE3176344D1 (en) * | 1980-12-02 | 1987-09-10 | British Gas Corp | Improvements in the replacement of mains |
| JPS6182086A (en) * | 1984-06-28 | 1986-04-25 | 広瀬 幹夫 | Method of replacement construction of piping installed in ground |
| GB8603540D0 (en) * | 1986-02-13 | 1986-03-19 | Elliott G | Sewer lining |
-
1987
- 1987-12-07 JP JP62310350A patent/JPH01150087A/en active Pending
-
1988
- 1988-07-27 GB GB8817871A patent/GB2213229B/en not_active Expired - Lifetime
- 1988-10-19 CA CA 580575 patent/CA1326600C/en not_active Expired - Fee Related
- 1988-10-21 DE DE19883835900 patent/DE3835900C2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01150087A (en) | 1989-06-13 |
| DE3835900C2 (en) | 1997-07-24 |
| GB8817871D0 (en) | 1988-09-01 |
| GB2213229A (en) | 1989-08-09 |
| DE3835900A1 (en) | 1989-06-15 |
| GB2213229B (en) | 1991-11-20 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |