CA1123215A - Soil moving device - Google Patents
Soil moving deviceInfo
- Publication number
- CA1123215A CA1123215A CA338,552A CA338552A CA1123215A CA 1123215 A CA1123215 A CA 1123215A CA 338552 A CA338552 A CA 338552A CA 1123215 A CA1123215 A CA 1123215A
- Authority
- CA
- Canada
- Prior art keywords
- towing
- landside
- implement
- soil
- point
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
- E02F5/104—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
- E02F5/104—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water
- E02F5/106—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water using ploughs, coulters, rippers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/14—Component parts for trench excavators, e.g. indicating devices travelling gear chassis, supports, skids
- E02F5/145—Component parts for trench excavators, e.g. indicating devices travelling gear chassis, supports, skids control and indicating devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Electric Cable Installation (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Sewage (AREA)
Abstract
Abstract of the Disclosure A trenching device suitable for towing which is so constructed as to resist the sideways component of the towing force, thereby reducing the sideways force on elements being buried. The invention avoids significant deviation from the axis of elements being buried in line, a problem which has confronted prior art trenching devices.
Description
Z~5 SOI~ MOVING D~VICE
This invention relates to a soil moving implement which is suitable for towing, more particularly to a soil moving implement for making a trench at an underwater site for burying a submarine pipeline or cable hereafter referred to as a trenching plough.
Trenching ploughs which have been previously proposed for pipeline burial have usually been towed by a surface vessel and obtained their steering from the surface vessel and for this it is necessary to know accurately the position of both the pipeline or cable and the plough and then to calculate the required course.
Even when this is done the line of action of the towing force may sometime deviate significantly from the axis of the pipeline with the risk of damage -thereto.
It is an object of the present invention to reduce this risk by providing an implement in which the sideways component of the towing force is resisted thereby reducing the side~ays force on the pipeline.
According to the present invention a soil moving implement which is suitable for towing underwater comprises:
(a) a body having attached thereto a soil cutting member, which in use forms a soil surface in the direction of travel of the implement, (b) a landside which engages the soil surface, (c) means for following a previously laid underwater pipeline or cable whereby the implement can travel in a direction di~ferent from the l~ne of the towing force, and (d) a hitch point to which in use a towing means is connected, the hitch point being located so that in use the line of the ~L~232~ ~
towing force passes through a point dîrectly above the landside so that when the direction of travel of the implement is different from the line of the towing force the sideways com-ponent of the towing force is resisted by the landside. The towing means can conveniently be a cable or rod or other link.
The soil cutting member and the landside can be formed in one piece. For example, a soil cutting blade may be provided whose edge constitutes the soil cutting member and whose sides constiiute the landside. Alternatively, the landside can be separate from the soil cutting member.
The point through which the towing force passes can be in the region of the effective centre of the landside. The term "effective centre" is well known to agricultural engineers and is the point on the landside through which the resultant soil force acts.
As stated above the line of the towin~ force passes through a point in the region of the landside when the direction of travel is different from the line of the towing force. This can be achieved by the hitch point being located in the region of the landside or the hitch point being located forward with respect to the landside so that in use the projected line of the towing force passes through the point in the region of the land-side.
The effect of this is that the sideways component of the towing force is resisted by the landside thereby enabling the implement ~o be steered with a smaller steering force. In a typical prior art trenching plough arrangement the hitch point is located forward with respect to the landside, at or near the front of the implement, with the effect that when the direction of travel is different from the line of the towing force, there is a significant sideways force on the implement. The implement can only resist this sideways force by exerting a similar force on the pipeline by means of guide arms or like means by which it is constrained to the pipeline.
The landside is conveniently at, or near the rear of the implement and consequently according to the invention the towing force (projected if necessary) will pass through the rear portion of the implement when the direction of travel is different from ,. .
- ~, ::: , ~Z3ZiL5 the line of the towing force.
The hitch point can be located over the landside (not necessarily directly above in a vertical sense, see Figures 2 and 4) or the point through which the projected line of the towing force passes can be over the landside (see Figure 6).
In most cases the point in the region of the landside will be located at a posltion along the length of the implement where the landside extends and rearward of the soil cutting member.
The hitch point can be movable on a laterally extending arm, the arm being so disposed so that the point moves on the circum-ference of a circle whose centre is at the point in the region of the landside.
The point in the region of the landside through which the line of the towing force passes can be located so that the components of the towing force and the soil cutting force perpendicular to the direction of travel create no significant couple in the horizontal plane.
The soil moving implement can be used for making a trench for a pipeline at an underwater site and can have in the reyion of the front thereof a carriage adapted to run on the pipeline so that at least a portion of the weight of the implement is supported by the pipeline.
The implement can further have located forward with respect to the carriage, a support member capable of contacting the ground to reduce the risk of overloading an unsupported section of pipeline.
The support member can be movable between a ground contac-ting position and a raised position free of the ground and means can be provided for moving the support member from one position to the other.
References to "above", "forward", "sideways" and "rear"
refer to the implement in its disposition for normal use.
The term sea bed includes the bottom of any body of water such as river, lake or ocean.
The term pipeline is intended to include flowlines.
Although the trenching device according to the invention is intended primarily for use underwater it can nevertheless be used on land.
.
. .
.
~lZ3;~L5 3a Reference to the line of towing force means the line of the towing force projected in the horizontal plane through the hitch point.
According to another aspect of the present invention a method of forming a trench in the sea bed comprises towing a soil moving implement on the sea bed and following a previously laid underwater cable or pipeline, the line of the towing force being inclined to the direction of travel of the implement, and wherein the line of the towing force passes through a point directly above a landside which tends to resist the sideways component of the towing force.
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, ~
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~Z3~Z15 The soil moving device according to the present invention may be employed to make a trench parallel and close to a pipeline or cable which can be moved sideways in-to the trench at a later time.
Alternatively,the trenching device can be employed to make the trench and place the pipeline or cable therein in one opration.
The trenching device is particularly suitable or use where the pipeline or cable has been previously installed on the sea bed although it is possible to use the trenching device to bury a pipeline or cable as it is laid from a surface vessel.
Although described with particular reference to making a trench for a pipeline or cable, the soil moving implement according to the invention may be used for other purposes, for example, for covering a pipeline or cable previously installed in a trench (see Figures 1 to 4), for collecting material from or under the sea bed, for example, obtaining samples of sea hed material or collecting manganese nodules The invention is illustrated by reference to the accompanying drawings in which:
Figure 1 is a side elevation of a soil moving implement in the form of a trenching plough showing the location of the hitch point, and Figure 2 is a plan view of the trenching plough shown in Figure 1.
Figure 3 is a side elevation of an alternative embodiment of the trenching plough in which steering is effected by means of a sensor which follows the pipeline and controls a servo mechanism and hydraulic ram.
Figure 4 is a plan view of the embodiment shown in Figure 3.
Figure 5 is a side elevation of a further embodiment of the trenching plough in which the hitch point is located on a laterally extending arm, and Figure 6 is a plan view of the trenching plough shown in Figure 5.
Referring to Figures 1 and 2 the trenching plough indicated generally by numeral 1 comprises a body in the form of beam 4 attached to the rear of which is a blade indicated generally by numeral 7, the leading face 6 of which is the soil cutting member and the sides 5 of which provide the landside. Located above the sides 5 is a hitch point in the form of a towing eye 3 to which a towing cable 2 is . .
, "~
~123;~5 connected. The forward part of the beam 4 is attached to a later-ally extending cross member 13 one end of which is attached to and supported by skid 10 on the sea bed 11. The trenching plough has a steering means in the form of guide wheels 9 which straddle pipe-line 8 and are attached to the other end of cross member 13 remotefrom skid 10. By means of the guide wheels 9 the trenching plough follows the pipeline 8 thus requiring no additional steering. The effect of the hitch point 3 located over the landside 5 is that the sideways component of the towing force is resisted with the result that the steering effect of the towing force is significantly reduced. In the disposition shown in Figures 1 and 2 the plough cuts a trench parallel to the pipeline 8 which has been previously installed in its trench. At the rear of the plough is a scraper 12 to displace soil to cover the pipeline.
Referring to Figure 3 and 4 the trenching plough indicated by reference numeral 21 is generally of similar construction to that shown in Figures 1 and 2 with the exception of the steering means.
The plough comprises a body in the form of a beam 24 attached to the rear of which is a blade indicated generally by numeral 27 the leading face 26 of which is the soil cutting member and the sides 25 of which provide the landside. Located above the sides 25 is a hitch point in the form of towing eye 23 to which a towing cable 22 is attached. The forward part of the beam 24 is attached to a laterally extending cross member 28 the ends of which are attached to, and supported by, skids 30 and 31 on the sea bed. The plough has steering means in the form of sensor 32 which scans the pipe-line 29 and controls a servo mechanism (not shown) which operates a hydraulic ram 33 which moves the skids 30 and 31 which have soil engaging blades ~only one of which 34 is shown). By means of this arrangement the trenching plough is able to follow the pipeline 29 which may in places be buried as shown in Figure 3 and produce a trench parallel to the axis of the pipeline. Attached to the rear of the body 24 are a pair of scraper arms 35 to move the soil.
Referring to Figures 5 and 6 the trenching plough indicated generally by numeral 41 comprises a body in the form of beam 44 attached to the rear of which is a blade indicated generally by numeral 47, the leading face 46 of which is the soil cutting edge 6 ~232~5 and the sides 45 of which provide the landside. In these respects the trenching plough is similar to the two embodiments previously described. The forward part of the beam 44 is attached to a laterally extending arm 43 the end of which is supported by skid 55. On the arm ~3 is mounted a hitch point in the form of towing eye 46 which is movable on the arm 43 by means of roller 48. The arm 43 has a curved face 49 on which the roller 48 moves so that the hitch point 46 moves on the circumference of a circle whose centre is at poin~ 50 which is over the landside 45. The effect of this is that the projected line o~ action of the towing force passes through point 50 with the result that the sideways component of the towing force is resisted by the landside 45.
The trenching plough has a steering means in the form of a pair of guide wheels 52 straddling the pipeline 54 the latter resting on a roller between the guide wheels 52. At the rear of the body is a pair of scrapers 60 for displacing soil sideways.
In use the trenching plough is towed by means of a line 56 attached to hitch point 46. The trenching plough passes along and under the pipeline 54. A trench is made into which the pipeline settles.
In the three embodiments shown the point through which the towing force passes, i.e. points 3, 23 and 50 are vertically above the effective centre of the landside in each case.
The present invention provides improved control of the trenching or other soil moving operation when the line of action of the towing force is up to 45 from the line of travel of the implement and particularly in the range up to 30. Further the line of the towing force (when projected in the horizontal plane through the hitch point) passes through, or close to, a point on the vertical axis passing through the point of intersection of the lines of action of the soil forces on the cutting member and landside. Thus, any sideways force applied by the towing means is resisted by the landside to reduce the resultant Gouple in the horizontal plane. ~t is thus possible to steer the implement wi~h a smaller steering force, with reduced risk of damage to the pipeline.
The embodiment of Figures 5 and ~ is particularly suitable for towing by an underwater tractor or other similar vehicle which -7 ~123~L5 cannot conveniently straddle the pipeline with the result that the towing force is always at an angle to the axis of the pipeline.
, ~ : :: : . .
This invention relates to a soil moving implement which is suitable for towing, more particularly to a soil moving implement for making a trench at an underwater site for burying a submarine pipeline or cable hereafter referred to as a trenching plough.
Trenching ploughs which have been previously proposed for pipeline burial have usually been towed by a surface vessel and obtained their steering from the surface vessel and for this it is necessary to know accurately the position of both the pipeline or cable and the plough and then to calculate the required course.
Even when this is done the line of action of the towing force may sometime deviate significantly from the axis of the pipeline with the risk of damage -thereto.
It is an object of the present invention to reduce this risk by providing an implement in which the sideways component of the towing force is resisted thereby reducing the side~ays force on the pipeline.
According to the present invention a soil moving implement which is suitable for towing underwater comprises:
(a) a body having attached thereto a soil cutting member, which in use forms a soil surface in the direction of travel of the implement, (b) a landside which engages the soil surface, (c) means for following a previously laid underwater pipeline or cable whereby the implement can travel in a direction di~ferent from the l~ne of the towing force, and (d) a hitch point to which in use a towing means is connected, the hitch point being located so that in use the line of the ~L~232~ ~
towing force passes through a point dîrectly above the landside so that when the direction of travel of the implement is different from the line of the towing force the sideways com-ponent of the towing force is resisted by the landside. The towing means can conveniently be a cable or rod or other link.
The soil cutting member and the landside can be formed in one piece. For example, a soil cutting blade may be provided whose edge constitutes the soil cutting member and whose sides constiiute the landside. Alternatively, the landside can be separate from the soil cutting member.
The point through which the towing force passes can be in the region of the effective centre of the landside. The term "effective centre" is well known to agricultural engineers and is the point on the landside through which the resultant soil force acts.
As stated above the line of the towin~ force passes through a point in the region of the landside when the direction of travel is different from the line of the towing force. This can be achieved by the hitch point being located in the region of the landside or the hitch point being located forward with respect to the landside so that in use the projected line of the towing force passes through the point in the region of the land-side.
The effect of this is that the sideways component of the towing force is resisted by the landside thereby enabling the implement ~o be steered with a smaller steering force. In a typical prior art trenching plough arrangement the hitch point is located forward with respect to the landside, at or near the front of the implement, with the effect that when the direction of travel is different from the line of the towing force, there is a significant sideways force on the implement. The implement can only resist this sideways force by exerting a similar force on the pipeline by means of guide arms or like means by which it is constrained to the pipeline.
The landside is conveniently at, or near the rear of the implement and consequently according to the invention the towing force (projected if necessary) will pass through the rear portion of the implement when the direction of travel is different from ,. .
- ~, ::: , ~Z3ZiL5 the line of the towing force.
The hitch point can be located over the landside (not necessarily directly above in a vertical sense, see Figures 2 and 4) or the point through which the projected line of the towing force passes can be over the landside (see Figure 6).
In most cases the point in the region of the landside will be located at a posltion along the length of the implement where the landside extends and rearward of the soil cutting member.
The hitch point can be movable on a laterally extending arm, the arm being so disposed so that the point moves on the circum-ference of a circle whose centre is at the point in the region of the landside.
The point in the region of the landside through which the line of the towing force passes can be located so that the components of the towing force and the soil cutting force perpendicular to the direction of travel create no significant couple in the horizontal plane.
The soil moving implement can be used for making a trench for a pipeline at an underwater site and can have in the reyion of the front thereof a carriage adapted to run on the pipeline so that at least a portion of the weight of the implement is supported by the pipeline.
The implement can further have located forward with respect to the carriage, a support member capable of contacting the ground to reduce the risk of overloading an unsupported section of pipeline.
The support member can be movable between a ground contac-ting position and a raised position free of the ground and means can be provided for moving the support member from one position to the other.
References to "above", "forward", "sideways" and "rear"
refer to the implement in its disposition for normal use.
The term sea bed includes the bottom of any body of water such as river, lake or ocean.
The term pipeline is intended to include flowlines.
Although the trenching device according to the invention is intended primarily for use underwater it can nevertheless be used on land.
.
. .
.
~lZ3;~L5 3a Reference to the line of towing force means the line of the towing force projected in the horizontal plane through the hitch point.
According to another aspect of the present invention a method of forming a trench in the sea bed comprises towing a soil moving implement on the sea bed and following a previously laid underwater cable or pipeline, the line of the towing force being inclined to the direction of travel of the implement, and wherein the line of the towing force passes through a point directly above a landside which tends to resist the sideways component of the towing force.
'`~.~'~~' : . .
, ~
.. . . . .
:: , ., . ~.:; :~ .. . .
~Z3~Z15 The soil moving device according to the present invention may be employed to make a trench parallel and close to a pipeline or cable which can be moved sideways in-to the trench at a later time.
Alternatively,the trenching device can be employed to make the trench and place the pipeline or cable therein in one opration.
The trenching device is particularly suitable or use where the pipeline or cable has been previously installed on the sea bed although it is possible to use the trenching device to bury a pipeline or cable as it is laid from a surface vessel.
Although described with particular reference to making a trench for a pipeline or cable, the soil moving implement according to the invention may be used for other purposes, for example, for covering a pipeline or cable previously installed in a trench (see Figures 1 to 4), for collecting material from or under the sea bed, for example, obtaining samples of sea hed material or collecting manganese nodules The invention is illustrated by reference to the accompanying drawings in which:
Figure 1 is a side elevation of a soil moving implement in the form of a trenching plough showing the location of the hitch point, and Figure 2 is a plan view of the trenching plough shown in Figure 1.
Figure 3 is a side elevation of an alternative embodiment of the trenching plough in which steering is effected by means of a sensor which follows the pipeline and controls a servo mechanism and hydraulic ram.
Figure 4 is a plan view of the embodiment shown in Figure 3.
Figure 5 is a side elevation of a further embodiment of the trenching plough in which the hitch point is located on a laterally extending arm, and Figure 6 is a plan view of the trenching plough shown in Figure 5.
Referring to Figures 1 and 2 the trenching plough indicated generally by numeral 1 comprises a body in the form of beam 4 attached to the rear of which is a blade indicated generally by numeral 7, the leading face 6 of which is the soil cutting member and the sides 5 of which provide the landside. Located above the sides 5 is a hitch point in the form of a towing eye 3 to which a towing cable 2 is . .
, "~
~123;~5 connected. The forward part of the beam 4 is attached to a later-ally extending cross member 13 one end of which is attached to and supported by skid 10 on the sea bed 11. The trenching plough has a steering means in the form of guide wheels 9 which straddle pipe-line 8 and are attached to the other end of cross member 13 remotefrom skid 10. By means of the guide wheels 9 the trenching plough follows the pipeline 8 thus requiring no additional steering. The effect of the hitch point 3 located over the landside 5 is that the sideways component of the towing force is resisted with the result that the steering effect of the towing force is significantly reduced. In the disposition shown in Figures 1 and 2 the plough cuts a trench parallel to the pipeline 8 which has been previously installed in its trench. At the rear of the plough is a scraper 12 to displace soil to cover the pipeline.
Referring to Figure 3 and 4 the trenching plough indicated by reference numeral 21 is generally of similar construction to that shown in Figures 1 and 2 with the exception of the steering means.
The plough comprises a body in the form of a beam 24 attached to the rear of which is a blade indicated generally by numeral 27 the leading face 26 of which is the soil cutting member and the sides 25 of which provide the landside. Located above the sides 25 is a hitch point in the form of towing eye 23 to which a towing cable 22 is attached. The forward part of the beam 24 is attached to a laterally extending cross member 28 the ends of which are attached to, and supported by, skids 30 and 31 on the sea bed. The plough has steering means in the form of sensor 32 which scans the pipe-line 29 and controls a servo mechanism (not shown) which operates a hydraulic ram 33 which moves the skids 30 and 31 which have soil engaging blades ~only one of which 34 is shown). By means of this arrangement the trenching plough is able to follow the pipeline 29 which may in places be buried as shown in Figure 3 and produce a trench parallel to the axis of the pipeline. Attached to the rear of the body 24 are a pair of scraper arms 35 to move the soil.
Referring to Figures 5 and 6 the trenching plough indicated generally by numeral 41 comprises a body in the form of beam 44 attached to the rear of which is a blade indicated generally by numeral 47, the leading face 46 of which is the soil cutting edge 6 ~232~5 and the sides 45 of which provide the landside. In these respects the trenching plough is similar to the two embodiments previously described. The forward part of the beam 44 is attached to a laterally extending arm 43 the end of which is supported by skid 55. On the arm ~3 is mounted a hitch point in the form of towing eye 46 which is movable on the arm 43 by means of roller 48. The arm 43 has a curved face 49 on which the roller 48 moves so that the hitch point 46 moves on the circumference of a circle whose centre is at poin~ 50 which is over the landside 45. The effect of this is that the projected line o~ action of the towing force passes through point 50 with the result that the sideways component of the towing force is resisted by the landside 45.
The trenching plough has a steering means in the form of a pair of guide wheels 52 straddling the pipeline 54 the latter resting on a roller between the guide wheels 52. At the rear of the body is a pair of scrapers 60 for displacing soil sideways.
In use the trenching plough is towed by means of a line 56 attached to hitch point 46. The trenching plough passes along and under the pipeline 54. A trench is made into which the pipeline settles.
In the three embodiments shown the point through which the towing force passes, i.e. points 3, 23 and 50 are vertically above the effective centre of the landside in each case.
The present invention provides improved control of the trenching or other soil moving operation when the line of action of the towing force is up to 45 from the line of travel of the implement and particularly in the range up to 30. Further the line of the towing force (when projected in the horizontal plane through the hitch point) passes through, or close to, a point on the vertical axis passing through the point of intersection of the lines of action of the soil forces on the cutting member and landside. Thus, any sideways force applied by the towing means is resisted by the landside to reduce the resultant Gouple in the horizontal plane. ~t is thus possible to steer the implement wi~h a smaller steering force, with reduced risk of damage to the pipeline.
The embodiment of Figures 5 and ~ is particularly suitable for towing by an underwater tractor or other similar vehicle which -7 ~123~L5 cannot conveniently straddle the pipeline with the result that the towing force is always at an angle to the axis of the pipeline.
, ~ : :: : . .
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A soil moving implement which is suitable for towing underwater and which comprises:
(a) a body having attached thereto a soil cutting member, which in use forms a soil surface in the direction of travel of the implement, (b) a landside which engages the soil surface, (c) means for following a previously laid underwater pipeline or cable whereby the implement can travel in a direction different from the line of the towing force, and (d) a hitch point to which in use a towing means is connected, the hitch point being located so that in use the line of the towing force passes through a point directly above the landside so that when the direction of travel of the implement is different from the line of the towing force the sideways component of the towing force is resisted by the landside.
(a) a body having attached thereto a soil cutting member, which in use forms a soil surface in the direction of travel of the implement, (b) a landside which engages the soil surface, (c) means for following a previously laid underwater pipeline or cable whereby the implement can travel in a direction different from the line of the towing force, and (d) a hitch point to which in use a towing means is connected, the hitch point being located so that in use the line of the towing force passes through a point directly above the landside so that when the direction of travel of the implement is different from the line of the towing force the sideways component of the towing force is resisted by the landside.
2. A soil moving implement as claimed in claim 1 wherein the hitch point is above the landside.
3. A soil moving implement as claimed in claim 1 wherein the hitch point is located so that in use the projected line of the towing force passes through the point directly above the landside.
4. A soil moving implement as claimed in claim 3, wherein the hitch point is movable on a laterally extending arm, the arm being disposed so that the hitch point moves on the circumference of a circle those centre is at the point directly above the landside.
5. A soil moving implement as claimed in claim 1 wherein the point directly above the landside through which the line of the towing force passes is located so that the component of the towing force and the soil cutting force in the direction of travel create substantially no couple in the horizontal plane through that point.
6. A soil moving implement as claimed in claim 5 wherein the hitch point is located so that the components of the towing force and the soil cutting force in the direction of travel create substantially no couple in the horizontal plane through the hitch point.
7. A method of forming a trench in the sea bed which comprises towing a soil moving implement on the sea bed and following a previously laid underwater cable or pipeline, the line of the towing force being inclined to the direction of travel of the implement, and wherein the line of the towing force passes through a point directly above a landside which tends to resist the sideways component of the towing force.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7842021 | 1978-10-26 | ||
| GB42021/78 | 1978-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1123215A true CA1123215A (en) | 1982-05-11 |
Family
ID=10500600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA338,552A Expired CA1123215A (en) | 1978-10-26 | 1979-10-26 | Soil moving device |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0010915B1 (en) |
| AU (1) | AU534656B2 (en) |
| CA (1) | CA1123215A (en) |
| DE (1) | DE2963948D1 (en) |
| MX (1) | MX149074A (en) |
| NO (1) | NO150322C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4428132A (en) * | 1981-09-11 | 1984-01-31 | The British Petroleum Company P.L.C. | Trenching plow with plow carriage on curved supporting track |
| GB8301514D0 (en) * | 1983-01-20 | 1983-02-23 | British Petroleum Co Plc | Plough assembly |
| GB8331892D0 (en) * | 1983-11-30 | 1984-01-04 | Soil Machine Dynamics Ltd | Ploughs |
| GB8524410D0 (en) * | 1985-10-03 | 1985-11-06 | Soil Machine Dynamics Ltd | Pipeline/cable plough |
| EP1016760A4 (en) * | 1997-01-09 | 2001-01-10 | Obschetsvo S Ogranichennoi Otv | Machine for uncovering a pipeline and operating element |
| GB9922247D0 (en) * | 1999-09-21 | 1999-11-17 | Engineering Business Ltd | Improvements to submarine ploughs |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL227745A (en) * | ||||
| FR1185238A (en) * | 1956-10-29 | 1959-07-31 | Cable pulling device | |
| US3024851A (en) * | 1960-01-28 | 1962-03-13 | Harres Alfred | Earth working tool and carriage of an underground cable laying machine |
| GB1228373A (en) * | 1967-05-03 | 1971-04-15 | ||
| GB1349515A (en) * | 1971-06-07 | 1974-04-03 | Hudswell Yates Dev Ltd | Mole ploughs |
| GB1384078A (en) * | 1972-03-20 | 1975-02-19 | Faldi G | Process and apparatus for achieving the mechanical trenching of a pipe-line in a sub-aqueous depth |
-
1979
- 1979-10-22 EP EP79302297A patent/EP0010915B1/en not_active Expired
- 1979-10-22 DE DE7979302297T patent/DE2963948D1/en not_active Expired
- 1979-10-23 AU AU52085/79A patent/AU534656B2/en not_active Expired
- 1979-10-25 NO NO793429A patent/NO150322C/en unknown
- 1979-10-25 MX MX179766A patent/MX149074A/en unknown
- 1979-10-26 CA CA338,552A patent/CA1123215A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NO793429L (en) | 1980-04-29 |
| NO150322C (en) | 1984-09-26 |
| EP0010915B1 (en) | 1982-10-27 |
| NO150322B (en) | 1984-06-18 |
| MX149074A (en) | 1983-08-18 |
| AU5208579A (en) | 1980-05-01 |
| EP0010915A1 (en) | 1980-05-14 |
| DE2963948D1 (en) | 1982-12-02 |
| AU534656B2 (en) | 1984-02-09 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |