CA1300048C - Low load pipe for pipe jacking - Google Patents
Low load pipe for pipe jackingInfo
- Publication number
- CA1300048C CA1300048C CA000585602A CA585602A CA1300048C CA 1300048 C CA1300048 C CA 1300048C CA 000585602 A CA000585602 A CA 000585602A CA 585602 A CA585602 A CA 585602A CA 1300048 C CA1300048 C CA 1300048C
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- socket
- section
- spigot
- low load
- 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 - Lifetime
Links
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A low load pipe for pipe jacking. The pipe body includes a socket section with a projecting annular rib at an external edge of the socket and a spigot section. The socket section has an internal diameter and an external diameter larger than the external diameter of the pipe body. The said spigot section has a length slightly longer than the length of the socket section. There is an outer pipe having a smooth external surface and an external diameter almost equal to the external diameter of the projecting annular rib. Rails project from the internal diameter of the outer pipe. The pipe body, with the socket section and the spigot section, define a gap with the outer pipe which is filled with a filler material which adheres to the projecting rails. The filler material is retained in the gap.
A low load pipe for pipe jacking. The pipe body includes a socket section with a projecting annular rib at an external edge of the socket and a spigot section. The socket section has an internal diameter and an external diameter larger than the external diameter of the pipe body. The said spigot section has a length slightly longer than the length of the socket section. There is an outer pipe having a smooth external surface and an external diameter almost equal to the external diameter of the projecting annular rib. Rails project from the internal diameter of the outer pipe. The pipe body, with the socket section and the spigot section, define a gap with the outer pipe which is filled with a filler material which adheres to the projecting rails. The filler material is retained in the gap.
Description
13~
405~0-6 T I "-L,k._O E' _T ~I E__l`JVENT I ON
L0~1 [ ~D _IPE FOE~_IPE TA_K ~G
The present invention relates -to a pipe of socke-t and spigot -type adapted for pipe jacking ancl havincJ a spigo-t whose internal and external diameters are larger than -those of the pipe body.
Pipe jacking is a methocl for burying a water main.
The rear end of a rnetal straigh-t pipe is inserted in the ear-th almost horizontally at a launch pit. Pressure is applied by a hydraulic jack or ~he like wi-thou-t excavating the ground. The spigot of the nex-t straight pipe is joined in the socket at -the rear of the preceding pipe. I`he pipes are :inser-tecl in the earth ancl pressure is appliecl by L5 the hydraulic jaclc. 'rhese steps are repeated to ~orm the requirecl pipe line.
In -this method a drawback is that ~ecause of the enlarged spigot of the pipes, considerable resistance is unavoidable during forward movement under the ground. To overcome this a circumférential flange has been provided on the spigo-t of each pipe to receive -the driving force and the outer periphery of the pipe is coated with cement mortar so -tha-t the outer periphery of the pipe be-tween -the flange on the spigot and the socket is almost the same as the larges-t external diameter of the socke-t. O-ther countermeasures, for example welding of ribs between the flanye on the spigot and pipe body, incorporation of reinforcing rods in the coating cement mortar have also been used to provide reinforcement.
These conventional pipes for pipe jacking still ha~e various disadvantages, for example instability of the mortared surface and an intricate manufacturing or assembling process. To mee-t -these disadvantclges applican-t ~.
hc~s proposed an 1mproved pipe aclaptecl for pipe jacking.
This improvecl pipe has a spigot prov:iclecl with an annular flarlge arld reinforced with a rib. Ar- outer pipe has smooth external surface and is fixed a-t the ou-ter edge 5 be-tween the spigot and the socket in longituclinal direc-tion. An annular CJap between the outer pipe ancl the pipe body is filled with a filler such dS sancl or foaming mortar. As a resul-t several advan-tages are aehievecl. E`or example frictional resistance between the outer surface of the pipe and -the earth is reduced enabling the pipe to be easily movecl forward by pipe jacking, loss of -the cement mortar is prevented, and manufacturillg ancl carrying of the pipe is easy.
The above improved pipe overeomes -the disadvantages of the known ancl customary pipe eoatecl with eement mortar, bu-t progress in the field of pipe line laying has brought several eonclitions cl:ifferent from the eonventional pipe jaeking ancl i-t is now necessary to review pipe requirements. For example, a pipe replaeement method without open art has been developed. Aeeording to this new method, when old pipe line beeomes obsolete, i-t is replaced with a new pipe while crushing and removing the old pipe. This differs from the eonven-tional pipe jaeking whieh is employed only when new pipe line is eonstrueted without exeavation.
In pipe jaeking as described above new pipe to be jaeked is moved forward in the horizontal eavity already provided under the ground by the old pipe line. Thus the required jaeking foree ean be mueh smaller than in conventional pipe jaeking. Aecordingly, it is not always neeessary to provide a flange on the spigot of the new pipe. Moreover, in the assembling proeess, it is difficult to fit an outer pipe, serving as an ou-ter easing, over the pipe body if there is a flange or rib present. In partieular, it will be very clifEieult to fill the spaee 9 3~0~L8 clefinecl hy the :ElancJe on the spigot, the socket and -the pl.pe with a .fi.ller wllile exhaus-ti.ng the air.
F,ven in the conven-tional constructiorl by pipe jacki.ng, the cl:Lstance of pipe jacking may be shor-t, for examp:Le, when just crossing a road or a railroad. The re~uired jackincJ force can thus be very small. In -these cases, it is not: always reasonable to provi.de a flange on the spigo-t.
The present inven-tion seeks to solve the above problems by providing an improved pipe of low load for pipe jacking.
The invention provides a :Low .Load pipe for pipe jacking, cornprising, a pipe body havi.ng an :internal diame-ter and an external di.ame-ter, sa:id pipe bocly includiny a socket sec-tion with a projec-ting annular rib at an external edge of the socket defining an external diameter, and a spigo-t section wi-th an outer periphery;
said socket section having an internal diameter and an external diameter larger than the ex-ternal cliameter of saicl pipe body, and said spigot section having a length slightly longer -than the length of the socket sec-tion; and an outer pipe having a smooth external surface and an external diameter almost equal -to -the external diameter of said projecting annular rib, and a plurality of projec-ting outer rails projecting from its internal diameter, said pipe body, with said socket section and said spigot secti.on, defining a gap with said outer pipe which is filled with a filler material which adheres to said projec-ting rails, said filler mater:ial being retained in said gap.
More speci:Eically it is preferable tha-t the filler be a self-curing material. It is also preferable that either an area in the vicinity of an end o:E -the outer pipe, on the spigo-t of the in-ternal pipe or areas in the vicinity ~L3~0~)~8 of both enclx thereof, are filled with a filler of sel-~-cul-incJ material, and the remainir~g area filled with a filler of non-self-curing Itlaterial. It is further preferable that -the end of the ou-ter pipe on the spiyot side of -the internal ~ipe is bent to contact the outer periphery of -the internal pipe. It :LS yet fur-ther prefe-rable that the inner periphery of the outer pipe be provided with annular projecting rails.
Since it is sufficient for the pipe accorcling to the present invention to meet the minimum requirements for endurance -to low load as mentioned above, the manufacturing thereof is simple ancl weight is reduced, which iS advantageous in transportation and constructit>n.
As for the aclvantacJes in manueacturing and assemb:ling the pipe, since -the spigot is not proviclecl with a flange or rib, mounting of -the outer pipe on the inner pipe is easy.
It is also advantageous that filler can be vertically poured into an annular gap be-tween the ou-ter pipe and the pipe body by erecting the pipe body with its socket down on the ground and mounting the outer pipe on the ou-ter periphery of the pipe body. This filler pouring method is better than the conventional method of filling the closed space with filler while the pipe is hori20ntal.
As for -the advantages in and after -the cons-truction process, a pipe is joined -to a preceding pipe in a line contact at the front end of the spigot section. This differs from the face contact joint between a flange portion on the socket end face and a flange fixed to the spigot in the prior art. Thus some flexibility is given by the line contact and allows the pipe to follow a certain irregu:Larity in the forward movement of the pipes.
~.
~3~0~8 IE :Lt. is necessary to fab.ricate a shor-ter pipe by cutting a stanclarcl Lerlg-th pipe at the cons-truction site, a flange and rib neecl no-t be attachecl to the spi.got sicle of the shortened p:Lpe as irl the prior ar-t. Any sho:rter pipe can be easily fab.ricatecl a-t the cons-truction site and the equipment necessary for such fabrication can be sirnplifiecl.
The invention ancl the prior ar-t a.re i]lustra-ted in the draw1ngs, in which:
Figure 1 is a fron-t sectional view iilus-trating an embocliment of the present invention;
Figures 2, 3 and 4 are front secti.onal views illus-trating further emboclimen-ts of the invention;
Figures 5 A and B are a parti.ally sec-tiona:L front view ancl a plan view to il].us-trate the inventi.on;
Figure 6 is a fron-t seetional view i:Llust.rati.ng the prior art; and Figure 7 A and B are sections illustrating the more recent pipe line replacement method withou-t open cut.
Diseussing the prior part first, Fi.gure 6 illustrates the recent prior art. This improved pipe has a spigot 4a provided with an annular flange J.2 and reinforeed wi-th a rib 13. There is an outer pipe 5a having a smoo-th external surfaee fixed at the outer edge between the spigot 4a and a soeke-t 3a in longituclinal direction. An annular gap formed between the outer pipe and pipe body is filled with a :Eiller 6a such as sand or foaming mortar.
: The aclvantages achieved include reduetion in frietional xesistance between the outer surfaee of the pipe and the ear-th, enabling the pipe to be easily moved forward by - pipe jaeking, preven-tion of loss of the eement mortar and ; simplifieation of manufaeture and earryi.ng of the pipe.
s indicated above, although the prececling improved pipe overeomes -the clisadvantages of -the known and cus-tomary pipe coated with cement mor-tar, progress in the f:Lelcl o~ pipe laylnl has introduced several cond:itions (-Iifferent from t,hf~ conventioncll pipe jacking. liowever, accordincl to even more recen-t development, when old pipe line become obso:Lete, it is replaced with new pipe wh:ile crushing and removing the o:Ld p,ipe. Figures 7A, 7s StlOW
an exdmp:le o the new pipe replacemen-t method. In Figure 7 A, a mole 15 moves forward into àn old pipe line 14 and crushes i-t. Temporary pipes 16 are connec-t,ed to the rear of the mole ànd follow the mole to be placed where the old pipes have been crushed. As illus-trated in Figure 7B, after completing replacement of the old pipe line wi-th temporary pipe~, new pipes lb are insertecl one by one from a launch pit 17 and -the rear parts of pipes lb are pushed Eorward by a hydraulic Jack l8. The first temporary pipe 16 is p~lshecl out to an reCept;Lon pit 19 to be removed to outside. These steps are repeated un-til complete replacement of the temporary pipes by a new pipe line is completed. The disadvantages of this procedure are described generally above. Figure 1 shows an ernbodiment of the present invention. A pipe 1 for pipe jacking comprises a straigh-t pipe body ~ and a socket 3 having internal and external diameters both larger than those of -the pipe body 2. Ano-ther end of the pipe body 2 as a spigot 4 to be inserted and joined into the socket of the preceding pipe.
The outer periphery o:E the pipe l is covered wi-th an outer pipe 5 having a smooth external surface and an external diameter almost equal -to the maximum external diameter R of the socket in such a manner -that the spigot section 4 may be a little longer than the enlarged portion L of the inner diameter of -the socket. A gap between -the outer pipe 5 and the ou-ter periphery of the pipe body 2 is filled with a filler 6.
A preceding pipe lA comes in contact with a succeeding pipe lB receiving a pressing force from the rear at the deepest part of the socket of the preceding ~L3~0048 pipe IA. The press:Lng ~orce is -transmitted Erorn a c:Lrcurnference ~ormed of the front end 7 of the ~pigo-t 4 of -the succeeding pipe ls to the ci.rcumference of -the deepest part of the socket sec-tion of -the preceding p1pe 1~. In the low load pipe jacking method like Ihis embodiment, -the -transmission of pressing force tangen-tially between -the front end of the spigot secti.on and the deepest par-t of the socket section is quite suf:Eicient for the required performance. It is also sa-tisfac-tory ~or additional parts (outer pipe and filler) of the outer periphery to absorb increasing resistance during the forward movemen-t by the pipe producecl as a result of enlargement of the diameter of the socket, especially with reduction of resistance by their smoo-th surfaces.
Since the addl-tions to the pe.riphery of the pipe are not required the internal section of the outer pipe 5, which may be as a spiral duc-t having a smooth surface or a liner of vinyl chloride, can be easily filled with a filler, ancl retention of the filler is the only requirement. To meet this requirement, it is customary to use self-curing materials, for example cement mortar, resin mortar and foaming cemen-t. It is also preferable that, as illustrated in Figure 2, the socket side 6A be filled with mortar, the in-termediate section 6B with sand, and the spigot 6C with mortar, respectively. It is further preferable that only the spigot side 6c be filled : with mortar and the remaining parts wi-th sand.
Figure 3 shows an embodiment in which the end of the outer pipe 5 on the spigot side of -the pipe 4 is ben-t toward its axis to form a flange 8 in contact with the outer periphery of the pipe 4. Filler is confined inside this flange. In this embodiment, it is necessary to provide a hole 9 through which air i.nside is exhausted and fille.r can enter.
~. ' ~ .
~L313C)OA8 FicJure 4 shows a further embodiment in which projec-ting rails lO are annular]y provided on the inner periphery of the outer pipe 5. As in Fig l, the SpicJot section 4 may be sligh-tly longer -than -~he enLarged portion Ll, and the gap between the outer pipe 5 and -the outer periphery of -the pipe body 2 is filled with a filler 6 which is retained. The annular rails 10 provide good adherence of the outer pipe 5 -to the filler 6. This proves helpful when it is considered that -the o~ter surface of the outer pipe S enyages the surrounding soil during the jacking process. Also, iE a detachment of -the outer pipe S did occur with respect to the filler 6, the ribs 10 would prevent relative movement of -the two.
The invention has the foLlowing advantages: In the embodiment of Figure 2, as the intermedia-te par-t is fillecl with sancl for joining a branch pipe to the pipe boss only cutting the outer pipe and removal of the sand from inside is required. When lifting a pipe to carry it, the thin outer pipe is prevented from deformation due to deacl weight by putting a wire round the mortared part.
In the embodiment shown in Figure 3, positioning is easily carried out just by engaging the outer pipe on the pipe, which results in easy manufact-ure ancl assembly.
In the embodiment shown in Figure 4, as the retaining function between -the outer pipe 5 and the filler 6 is increasedj there is no disadvantage such as displacement or burring of the outer pipe due to frictional resistance in construction process.
..... .,~, .. ~
405~0-6 T I "-L,k._O E' _T ~I E__l`JVENT I ON
L0~1 [ ~D _IPE FOE~_IPE TA_K ~G
The present invention relates -to a pipe of socke-t and spigot -type adapted for pipe jacking ancl havincJ a spigo-t whose internal and external diameters are larger than -those of the pipe body.
Pipe jacking is a methocl for burying a water main.
The rear end of a rnetal straigh-t pipe is inserted in the ear-th almost horizontally at a launch pit. Pressure is applied by a hydraulic jack or ~he like wi-thou-t excavating the ground. The spigot of the nex-t straight pipe is joined in the socket at -the rear of the preceding pipe. I`he pipes are :inser-tecl in the earth ancl pressure is appliecl by L5 the hydraulic jaclc. 'rhese steps are repeated to ~orm the requirecl pipe line.
In -this method a drawback is that ~ecause of the enlarged spigot of the pipes, considerable resistance is unavoidable during forward movement under the ground. To overcome this a circumférential flange has been provided on the spigo-t of each pipe to receive -the driving force and the outer periphery of the pipe is coated with cement mortar so -tha-t the outer periphery of the pipe be-tween -the flange on the spigot and the socket is almost the same as the larges-t external diameter of the socke-t. O-ther countermeasures, for example welding of ribs between the flanye on the spigot and pipe body, incorporation of reinforcing rods in the coating cement mortar have also been used to provide reinforcement.
These conventional pipes for pipe jacking still ha~e various disadvantages, for example instability of the mortared surface and an intricate manufacturing or assembling process. To mee-t -these disadvantclges applican-t ~.
hc~s proposed an 1mproved pipe aclaptecl for pipe jacking.
This improvecl pipe has a spigot prov:iclecl with an annular flarlge arld reinforced with a rib. Ar- outer pipe has smooth external surface and is fixed a-t the ou-ter edge 5 be-tween the spigot and the socket in longituclinal direc-tion. An annular CJap between the outer pipe ancl the pipe body is filled with a filler such dS sancl or foaming mortar. As a resul-t several advan-tages are aehievecl. E`or example frictional resistance between the outer surface of the pipe and -the earth is reduced enabling the pipe to be easily movecl forward by pipe jacking, loss of -the cement mortar is prevented, and manufacturillg ancl carrying of the pipe is easy.
The above improved pipe overeomes -the disadvantages of the known ancl customary pipe eoatecl with eement mortar, bu-t progress in the field of pipe line laying has brought several eonclitions cl:ifferent from the eonventional pipe jaeking ancl i-t is now necessary to review pipe requirements. For example, a pipe replaeement method without open art has been developed. Aeeording to this new method, when old pipe line beeomes obsolete, i-t is replaced with a new pipe while crushing and removing the old pipe. This differs from the eonven-tional pipe jaeking whieh is employed only when new pipe line is eonstrueted without exeavation.
In pipe jaeking as described above new pipe to be jaeked is moved forward in the horizontal eavity already provided under the ground by the old pipe line. Thus the required jaeking foree ean be mueh smaller than in conventional pipe jaeking. Aecordingly, it is not always neeessary to provide a flange on the spigot of the new pipe. Moreover, in the assembling proeess, it is difficult to fit an outer pipe, serving as an ou-ter easing, over the pipe body if there is a flange or rib present. In partieular, it will be very clifEieult to fill the spaee 9 3~0~L8 clefinecl hy the :ElancJe on the spigot, the socket and -the pl.pe with a .fi.ller wllile exhaus-ti.ng the air.
F,ven in the conven-tional constructiorl by pipe jacki.ng, the cl:Lstance of pipe jacking may be shor-t, for examp:Le, when just crossing a road or a railroad. The re~uired jackincJ force can thus be very small. In -these cases, it is not: always reasonable to provi.de a flange on the spigo-t.
The present inven-tion seeks to solve the above problems by providing an improved pipe of low load for pipe jacking.
The invention provides a :Low .Load pipe for pipe jacking, cornprising, a pipe body havi.ng an :internal diame-ter and an external di.ame-ter, sa:id pipe bocly includiny a socket sec-tion with a projec-ting annular rib at an external edge of the socket defining an external diameter, and a spigo-t section wi-th an outer periphery;
said socket section having an internal diameter and an external diameter larger than the ex-ternal cliameter of saicl pipe body, and said spigot section having a length slightly longer -than the length of the socket sec-tion; and an outer pipe having a smooth external surface and an external diameter almost equal -to -the external diameter of said projecting annular rib, and a plurality of projec-ting outer rails projecting from its internal diameter, said pipe body, with said socket section and said spigot secti.on, defining a gap with said outer pipe which is filled with a filler material which adheres to said projec-ting rails, said filler mater:ial being retained in said gap.
More speci:Eically it is preferable tha-t the filler be a self-curing material. It is also preferable that either an area in the vicinity of an end o:E -the outer pipe, on the spigo-t of the in-ternal pipe or areas in the vicinity ~L3~0~)~8 of both enclx thereof, are filled with a filler of sel-~-cul-incJ material, and the remainir~g area filled with a filler of non-self-curing Itlaterial. It is further preferable that -the end of the ou-ter pipe on the spiyot side of -the internal ~ipe is bent to contact the outer periphery of -the internal pipe. It :LS yet fur-ther prefe-rable that the inner periphery of the outer pipe be provided with annular projecting rails.
Since it is sufficient for the pipe accorcling to the present invention to meet the minimum requirements for endurance -to low load as mentioned above, the manufacturing thereof is simple ancl weight is reduced, which iS advantageous in transportation and constructit>n.
As for the aclvantacJes in manueacturing and assemb:ling the pipe, since -the spigot is not proviclecl with a flange or rib, mounting of -the outer pipe on the inner pipe is easy.
It is also advantageous that filler can be vertically poured into an annular gap be-tween the ou-ter pipe and the pipe body by erecting the pipe body with its socket down on the ground and mounting the outer pipe on the ou-ter periphery of the pipe body. This filler pouring method is better than the conventional method of filling the closed space with filler while the pipe is hori20ntal.
As for -the advantages in and after -the cons-truction process, a pipe is joined -to a preceding pipe in a line contact at the front end of the spigot section. This differs from the face contact joint between a flange portion on the socket end face and a flange fixed to the spigot in the prior art. Thus some flexibility is given by the line contact and allows the pipe to follow a certain irregu:Larity in the forward movement of the pipes.
~.
~3~0~8 IE :Lt. is necessary to fab.ricate a shor-ter pipe by cutting a stanclarcl Lerlg-th pipe at the cons-truction site, a flange and rib neecl no-t be attachecl to the spi.got sicle of the shortened p:Lpe as irl the prior ar-t. Any sho:rter pipe can be easily fab.ricatecl a-t the cons-truction site and the equipment necessary for such fabrication can be sirnplifiecl.
The invention ancl the prior ar-t a.re i]lustra-ted in the draw1ngs, in which:
Figure 1 is a fron-t sectional view iilus-trating an embocliment of the present invention;
Figures 2, 3 and 4 are front secti.onal views illus-trating further emboclimen-ts of the invention;
Figures 5 A and B are a parti.ally sec-tiona:L front view ancl a plan view to il].us-trate the inventi.on;
Figure 6 is a fron-t seetional view i:Llust.rati.ng the prior art; and Figure 7 A and B are sections illustrating the more recent pipe line replacement method withou-t open cut.
Diseussing the prior part first, Fi.gure 6 illustrates the recent prior art. This improved pipe has a spigot 4a provided with an annular flange J.2 and reinforeed wi-th a rib 13. There is an outer pipe 5a having a smoo-th external surfaee fixed at the outer edge between the spigot 4a and a soeke-t 3a in longituclinal direction. An annular gap formed between the outer pipe and pipe body is filled with a :Eiller 6a such as sand or foaming mortar.
: The aclvantages achieved include reduetion in frietional xesistance between the outer surfaee of the pipe and the ear-th, enabling the pipe to be easily moved forward by - pipe jaeking, preven-tion of loss of the eement mortar and ; simplifieation of manufaeture and earryi.ng of the pipe.
s indicated above, although the prececling improved pipe overeomes -the clisadvantages of -the known and cus-tomary pipe coated with cement mor-tar, progress in the f:Lelcl o~ pipe laylnl has introduced several cond:itions (-Iifferent from t,hf~ conventioncll pipe jacking. liowever, accordincl to even more recen-t development, when old pipe line become obso:Lete, it is replaced with new pipe wh:ile crushing and removing the o:Ld p,ipe. Figures 7A, 7s StlOW
an exdmp:le o the new pipe replacemen-t method. In Figure 7 A, a mole 15 moves forward into àn old pipe line 14 and crushes i-t. Temporary pipes 16 are connec-t,ed to the rear of the mole ànd follow the mole to be placed where the old pipes have been crushed. As illus-trated in Figure 7B, after completing replacement of the old pipe line wi-th temporary pipe~, new pipes lb are insertecl one by one from a launch pit 17 and -the rear parts of pipes lb are pushed Eorward by a hydraulic Jack l8. The first temporary pipe 16 is p~lshecl out to an reCept;Lon pit 19 to be removed to outside. These steps are repeated un-til complete replacement of the temporary pipes by a new pipe line is completed. The disadvantages of this procedure are described generally above. Figure 1 shows an ernbodiment of the present invention. A pipe 1 for pipe jacking comprises a straigh-t pipe body ~ and a socket 3 having internal and external diameters both larger than those of -the pipe body 2. Ano-ther end of the pipe body 2 as a spigot 4 to be inserted and joined into the socket of the preceding pipe.
The outer periphery o:E the pipe l is covered wi-th an outer pipe 5 having a smooth external surface and an external diameter almost equal -to the maximum external diameter R of the socket in such a manner -that the spigot section 4 may be a little longer than the enlarged portion L of the inner diameter of -the socket. A gap between -the outer pipe 5 and the ou-ter periphery of the pipe body 2 is filled with a filler 6.
A preceding pipe lA comes in contact with a succeeding pipe lB receiving a pressing force from the rear at the deepest part of the socket of the preceding ~L3~0048 pipe IA. The press:Lng ~orce is -transmitted Erorn a c:Lrcurnference ~ormed of the front end 7 of the ~pigo-t 4 of -the succeeding pipe ls to the ci.rcumference of -the deepest part of the socket sec-tion of -the preceding p1pe 1~. In the low load pipe jacking method like Ihis embodiment, -the -transmission of pressing force tangen-tially between -the front end of the spigot secti.on and the deepest par-t of the socket section is quite suf:Eicient for the required performance. It is also sa-tisfac-tory ~or additional parts (outer pipe and filler) of the outer periphery to absorb increasing resistance during the forward movemen-t by the pipe producecl as a result of enlargement of the diameter of the socket, especially with reduction of resistance by their smoo-th surfaces.
Since the addl-tions to the pe.riphery of the pipe are not required the internal section of the outer pipe 5, which may be as a spiral duc-t having a smooth surface or a liner of vinyl chloride, can be easily filled with a filler, ancl retention of the filler is the only requirement. To meet this requirement, it is customary to use self-curing materials, for example cement mortar, resin mortar and foaming cemen-t. It is also preferable that, as illustrated in Figure 2, the socket side 6A be filled with mortar, the in-termediate section 6B with sand, and the spigot 6C with mortar, respectively. It is further preferable that only the spigot side 6c be filled : with mortar and the remaining parts wi-th sand.
Figure 3 shows an embodiment in which the end of the outer pipe 5 on the spigot side of -the pipe 4 is ben-t toward its axis to form a flange 8 in contact with the outer periphery of the pipe 4. Filler is confined inside this flange. In this embodiment, it is necessary to provide a hole 9 through which air i.nside is exhausted and fille.r can enter.
~. ' ~ .
~L313C)OA8 FicJure 4 shows a further embodiment in which projec-ting rails lO are annular]y provided on the inner periphery of the outer pipe 5. As in Fig l, the SpicJot section 4 may be sligh-tly longer -than -~he enLarged portion Ll, and the gap between the outer pipe 5 and -the outer periphery of -the pipe body 2 is filled with a filler 6 which is retained. The annular rails 10 provide good adherence of the outer pipe 5 -to the filler 6. This proves helpful when it is considered that -the o~ter surface of the outer pipe S enyages the surrounding soil during the jacking process. Also, iE a detachment of -the outer pipe S did occur with respect to the filler 6, the ribs 10 would prevent relative movement of -the two.
The invention has the foLlowing advantages: In the embodiment of Figure 2, as the intermedia-te par-t is fillecl with sancl for joining a branch pipe to the pipe boss only cutting the outer pipe and removal of the sand from inside is required. When lifting a pipe to carry it, the thin outer pipe is prevented from deformation due to deacl weight by putting a wire round the mortared part.
In the embodiment shown in Figure 3, positioning is easily carried out just by engaging the outer pipe on the pipe, which results in easy manufact-ure ancl assembly.
In the embodiment shown in Figure 4, as the retaining function between -the outer pipe 5 and the filler 6 is increasedj there is no disadvantage such as displacement or burring of the outer pipe due to frictional resistance in construction process.
..... .,~, .. ~
Claims (6)
1. A low load pipe for pipe jacking, comprising:
a pipe body having an internal diameter and an external diameter, said pipe body including a socket section with a projecting annular rib at an external edge of the socket defining an external diameter, and a spigot section with an outer periphery;
said socket section having an internal diameter and an external diameter larger than the external diameter of said pipe body, and said spigot section having a length slightly longer than the length of the socket section; and an outer pipe having a smooth external. surface and an external diameter almost equal to the external. diameter of said projecting annular rib, and a plurality of projecting outer rails projecting from its internal diameter, said pipe body, with said socket section and said spigot section, defining a gap with said outer pipe which is filled with a filler material which adheres to said projecting rails, said filler material being retained in said gap.
a pipe body having an internal diameter and an external diameter, said pipe body including a socket section with a projecting annular rib at an external edge of the socket defining an external diameter, and a spigot section with an outer periphery;
said socket section having an internal diameter and an external diameter larger than the external diameter of said pipe body, and said spigot section having a length slightly longer than the length of the socket section; and an outer pipe having a smooth external. surface and an external diameter almost equal to the external. diameter of said projecting annular rib, and a plurality of projecting outer rails projecting from its internal diameter, said pipe body, with said socket section and said spigot section, defining a gap with said outer pipe which is filled with a filler material which adheres to said projecting rails, said filler material being retained in said gap.
2. The low load pipe as defined in claim 1, wherein said outer pipe includes a bent portion at one end which contacts the outer periphery of said pipe body.
3. The low load pipe as defined in claim 2, wherein said bent portion includes at least one hole.
4. The low load pipe as defined in claim 1, wherein the filler material comprises a self-curing material.
5. The low load pipe as defined in claim 4, wherein said outer pipe includes a bent portion at one end which contacts the outer periphery of said pipe body.
6. The low load pipe as defined in claim 5, wherein said bent portion includes at least one hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000585602A CA1300048C (en) | 1988-12-12 | 1988-12-12 | Low load pipe for pipe jacking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000585602A CA1300048C (en) | 1988-12-12 | 1988-12-12 | Low load pipe for pipe jacking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1300048C true CA1300048C (en) | 1992-05-05 |
Family
ID=4139269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000585602A Expired - Lifetime CA1300048C (en) | 1988-12-12 | 1988-12-12 | Low load pipe for pipe jacking |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1300048C (en) |
-
1988
- 1988-12-12 CA CA000585602A patent/CA1300048C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |