WO2018204989A1

WO2018204989A1 - Apparatus and methods for breaking conduits

Info

Publication number: WO2018204989A1
Application number: PCT/AU2018/050445
Authority: WO
Inventors: Philip Thompson; Mike Stokes; Lucy Milkeraitis
Original assignee: South East Water Corporation
Priority date: 2017-05-12
Filing date: 2018-05-11
Publication date: 2018-11-15
Also published as: AU2018265768A1

Abstract

An apparatus for breaking conduits comprises a breaking component having an elongate body defining a passage extending through the breaking component along the length of the elongate body and a movable component. The movable component is configured to engage with a proximal end of an existing conduit. The apparatus further comprises a coupler arranged to couple the movable component to a connector, wherein the connector is configured to extend from the movable component within and along a length of the existing conduit and through the passage of the breaking component to a pulling device. The movable component is configured to progressively drive the existing conduit toward the breaking component along a longitudinal axis of the existing conduit in response to activation of the pulling device to cause a distal end of the existing conduit to engage with the breaking component to break the existing conduit.

Description

"Apparatus and methods for breaking conduits"

Technical Field

[0001] Described embodiments relate to apparatus and methods for breaking conduits, and in particular, conduits located underground or within structures, such as pipes.

Background

[0002] Repair or replacement of conduits or pipes, such as water or sewer pipes, or cable carrying conduits, is generally required as a result of damage or deterioration to the conduits over time. Occasionally, such conduits are composed from potentially hazardous materials, such as asbestos, and which may be of concern from an environmental perspective and may need to be replaced. Such conduits are often located underground or within structures which can make replacement of the conduits disruptive, time-consuming and costly.

[0003] It is desired to address or ameliorate one or more shortcomings or disadvantages associated with known apparatus and methods for breaking conduits.

Summary

[0004] Some embodiments relate to an apparatus for breaking conduits, the apparatus comprising: a breaking component having an elongate body defining a passage extending through the breaking component along the length of the elongate body; a movable component, the movable component configured to engage with a proximal end of an existing conduit; a coupler arranged to couple the movable component to a connector, the connector configured to extend from the movable component within and along a length of the existing conduit and through the passage of the breaking component to a pulling device; and wherein the movable component is configured to progressively drive the existing conduit toward the breaking component along a longitudinal axis of the existing conduit in response to activation of the pulling device to cause a distal end of the existing conduit to engage with the breaking component to break the existing conduit.

[0005] In some embodiments, the breaking component comprises one or more breaker ribs extending along at least a portion of the elongate body. For example, the one or more breaker ribs may be tapered along at least a portion of their length toward a distal end of the elongate body. In some embodiments, the one or more breaker ribs comprises a plurality of breaker ribs disposed in a spaced-apart manner about the elongate body. In some embodiments, the breaking component comprises an upper breaking component portion and a lower breaking component portion arranged to be detachably connected together.

[0006] In some embodiments, the movable component comprises a body including a first conduit engaging portion for engaging an existing conduit, wherein the first conduit engaging portion comprises a plurality of conduit engaging ribs disposed about a shaft and wherein the plurality of conduit engaging ribs are configured to frictionally engage with an internal surface of the existing conduit. For example, the conduit engaging ribs may comprise a tapered portion to facilitate engagement with the existing conduit.

[0007] In some embodiments, the movable component comprises a body including a first conduit engaging portion for engaging an existing conduit, wherein the first conduit engaging portion comprises a substantially cylindrical chamber configured for receiving and engaging the existing conduit.

[0008] In some embodiments, the body of the movable component further comprises a second conduit engaging portion for engaging a replacement conduit to be drawn by the movable component into a position vacated by the existing conduit. For example, the second conduit engaging portion may comprise substantially cylindrical chamber for receiving and engaging the replacement conduit. In some embodiments, a plurality of apertures are disposed along and/or about the chamber for receiving frictionally engaging members to frictionally engage with the replacement conduit. In some embodiments, a plurality of engaging ribs are disposed about an internal surface of the chamber and are configured to frictionally engage with an external surface of the replacement conduit. In some embodiments, the second conduit engaging portion comprises a plurality of conduit engaging ribs disposed about a shaft and configured to frictionally engage with an internal surface of a replacement conduit.

[0009] In some embodiments, the body of the movable component comprises a core section comprising a core shaft and a plurality of vanes extending along at least a portion of the length of the core shaft and disposed about the shaft. The core section may further comprise a beam projecting from one or both of the major surfaces of one or more of the plurality of vanes and wherein one or more apertures are disposed in a major surface of each beam to allow a shroud of the movable component to be secured to the body.

[0010] In some embodiments, the apparatus further comprises a shroud configured to removeably receive at least a portion of the movable component. The shroud may comprise at least one projection extending radially about an internal surface of the shroud to assist in drawing the replacement conduit into position when the apparatus is in use.

[0011] In some embodiments, the apparatus further comprises a first shroud configured to removeably receive and engage with the core section and at least a portion of the first conduit engaging portion, and a second shroud configured to removeably receive and engage with at least a portion of the first conduit engaging portion. The first and second shrouds may each comprise an upper shroud portion and a lower shroud portion arranged to be detachably connected together. In some embodiments, the first shroud comprises at least one projection extending radially about an internal surface of the first shroud to assist in drawing the replacement conduit into position when the apparatus is in use. [0012] Some embodiments relate to a method of breaking a conduit using the described apparatus, the method comprising: positioning a pulling device at a first pit; feeding a connector through an existing conduit, from the first pit, through a second pit, to a third pit; attaching a breaking component of the apparatus to the existing conduit and securing the breaking component to a support structure in a first pit; connecting the connector to a coupler of a movable component of the apparatus; attaching a first engaging portion of the movable component to the existing conduit at the third pit; activating a pulling device to cause the pulling device to pull the connector, thereby pulling the coupler and the moveable component, causing the movable component to progressively drive the existing conduit toward the breaking component along a longitudinal axis of the existing conduit and to cause a distal end of the existing conduit to engage with the breaking component to break the existing conduit.

[0013] In some embodiments, the method further comprises attaching a second engaging portion of the movable component to a replacement conduit at the third pit such that the moving component progressively pulls the replacement conduit into a space vacated by the existing conduit as the existing conduit is being driven toward the breaking component.

[0014] In some embodiments, the method further comprises positioning a receptacle in proximity to the breaking component in the second pit to collect debris from the existing conduit as it breaks on the breaking component.

[0015] Some embodiments relate to a method of breaking a buried conduit, comprising: coupling a movable collar component to a distal end of the buried conduit; pulling the movable collar to advance the conduit toward and onto a stationary breaking component to progressively break the conduit from a proximal end of the conduit to the distal end of the conduit. In some embodiments, the breaking component is configured to cause the conduit to break outwardly as the conduit is advanced onto the breaking component. Brief Description of Drawings

[0016] Embodiments will be further described with reference to the following drawings in which:

[0017] Figure 1 is an exploded perspective view of an apparatus for breaking conduits, according to some embodiments;

[0018] Figures 2A, 2B and 2C are a plan view of the apparatus of Figure 1, according to some embodiments, a perspective view of the apparatus of Figure 2B, and a cross sectional view of the apparatus taken along section A-A of Figure 2A, respectively;

[0019] Figures 3 A, 3B, 3C and 3D are a perspective view of an upper breaking component portion of a breaking component of the apparatus of Figure 1, according to some embodiments, an underside view of the upper breaking component portion of Figure 3A, an end view of the upper breaking component portion of Figure 3A, and a cross sectional view of the upper breaking component portion taken along section M-M of Figure 3C, respectively;

[0020] Figures 4A, 4B and 4C are a perspective view of mounting plate for mounting the breaking component of Figure 3A to a support structure , according to some embodiments, a front view of the mounting plate of Figure 4 A, and a side view of the mounting plate of Figure 4A, respectively;

[0021] Figures 5 A, 5B and 5C are a perspective view of a support structure to which the mounting plate of Figure 4A and the breaking component of Figure 3A are configured to be attached, according to some embodiments, a front view of the support structure of Figure 5A, and a side view of the support structure of Figure 5A, respectively;

[0022] Figures 6A, 6B, 6C, 6D, 6E and 6F are a first perspective view of a body of a moveable component of the apparatus of Figure 1, according to some embodiments, a second perspective view of the body of Figure 6A, a plan view of the body of Figure 6A, a cross sectional view of the body taken along section G-G of Figure 6C, a cross sectional view of the body taken along section F-F of Figure 6C, and a cross sectional view of the body taken along section E-E of Figure 6C, respectively;

[0023] Figures 7A, 7B, 7C, 7D, and 7E are a first perspective view of a shroud of a moveable component of the apparatus of Figure 1, according to some embodiments, a second perspective view of the shroud of Figure 7A, a plan view of the shroud of Figure 7A, a cross sectional view of the body taken along section H-H of Figure 7C, and a cross sectional view of the body taken along section I-I of Figure 7C, respectively;

[0024] Figure 8 is an exploded perspective view of an apparatus for breaking conduits, according to some embodiments;

[0025] Figures 9A, 9B and 9C are a plan view of the apparatus of Figure 8, a perspective view of the apparatus of Figure 9A, a cross sectional view of the apparatus taken along section A-A of Figure 9A, respectively;

[0026] Figures 10A, 10B, IOC and 10D are a perspective view of a first lower shroud part of a first shroud of a moveable component of the apparatus of Figure 8, according to some embodiments, a plan view of the first lower shroud part of Figure 10A, an end view of the first lower shroud part of Figure 10A, and a cross sectional view of the first lower shroud part taken along section J-J of Figure IOC, respectively;

[0027] Figures 11A, 11B, 11C and 11D are a perspective view of a second shroud of a moveable component of the apparatus of Figure 8, according to some embodiments, an end view of the second shroud of Figure 11 A, a plan view of the second shroud of Figure 11 A, and a cross sectional view of the second shroud taken along section K-K of Figure 11C, and respectively; [0028] Figure 12 is a schematic drawing of the apparatus of Figures 1 or Figure 8 in use underground, connected to an existing conduit and a replacement conduit, according to some embodiments; and

[0029] Figure 13 is a perspective view showing an apparatus assembly in accordance with a preferred embodiment of the present invention

[0030] Figure 14 is a plan view of the apparatus assembly shown in Figure 13;

[0031] Figure 15 is a sectional view of the apparatus assembly of Figure 14;

[0032] Figure 16 is a forward perspective view showing portions of a breaking component of the apparatus assembly of Figures 13-15 coupled by a hinge connection;

[0033] Figure 17 is a perspective view showing a movable component of the apparatus assembly of Figure 13;

[0034] Figure 18 is a perspective sectional view of the movable component of Figure 17; and

[0035] Figure 19 is a perspective exploded view of the movable component of Figures 17 and 18 from behind.

Description of Embodiments

[0036] Described embodiments relate to apparatus and methods for breaking conduits, and in particular, existing conduits located underground or within structures, such as pipes. Some embodiments further relate to apparatus and methods for simultaneously progressing existing conduits towards a breaking component of the apparatus and introducing replacement conduits into a position vacated by the broken conduit. [0037] Referring to Figures 1, which depicts an exploded view of an apparatus 100 for breaking conduits, according to some embodiments and Figure 12, which depicts the apparatus 100 in use, according to some embodiments. The apparatus 100 comprises a breaking component 102 and a movable component 104. The movable component 104 is configured to engage with a proximal end of an existing conduit 302 (Figure 12) to progressively drive the existing conduit 302 toward the breaking component 102 along a longitudinal axis of the existing conduit 302.

[0038] In some embodiments, the movable component 104 is coupled to a connector 300 (Figure 12) configured to extend from the movable component 104 within and along a length of the existing conduit 302 and through the breaking component 102 to a pulling device (not shown). The movable component 104 is configured to progressively drive the existing conduit 302 toward the breaking component 102 along the longitudinal axis of the existing conduit 302 in response to activation of a pulling device (not shown) to cause a distal end of the existing conduit 302 to engage with the breaking component 102 to break the existing conduit 302. Fragments or debris 304 (Figure 12) from the broken existing conduit 302 (Figure 12) may be collected in a receptacle 306 (Figure 12) disposed at the breaking component 102 and which may then be disposed of. In some embodiments, the moving component 104 may be configured to engage with a proximal end of a replacement conduit 308 (Figure 12) to progressively pull the replacement conduit 308 into the space vacated by the existing conduit 302 as the existing conduit 302 is being driven toward the breaking component 102.

[0039] Referring to Figures 1, 2A to 2C and 3 A to 3D, the breaking component 102 may comprise an elongate body 106 defining the passage 108, which extends through the breaking component 102 and along the length of the elongate body 106. In some embodiments, the elongate body 106 comprises one or more breaker ribs 110 or darts extending along at least a portion of the elongate body 106. In an embodiment where the elongate body 106 comprises a plurality of breaker ribs 110, the plurality of breaker ribs 110 may be disposed in a spaced-apart manner about the elongate body 106. For example, the breaker ribs 110 may be disposed in an equally spaced-apart manner about the elongate body 106. In some embodiments, as shown in Figure 1, the elongate body 106 comprises four breaker ribs 110 disposed about the elongate body 106 in a spaced-apart manner, and each extending along at least a portion of the elongate body 106. In some embodiments, the one or more breaker ribs 110 may be tapered along at least a portion of their length toward a distal end 114 of the elongate body 106. In some embodiments, the one or more breaker ribs 110 may comprise a non-tapered section (or section of uniform height) alongside a tapered section, tapering toward the distal end 114 of the elongate body 106.

[0040] In some embodiments, the breaking component 102 comprises a base plate 112 extending radially about the elongate body 106. As shown in the Figures, the base plate 112 may be disposed part way along the elongate body 106 such that a proximal end 116 of the elongate body 106 projects or extends from the base plate 112. In some embodiments, the one or more breaker ribs 110 may extend from the base plate 112 toward the distal end 114 of the elongate body 106. For example, the proximal end 116 of the elongate body 106 may project or extend from the base plate 112 in a first or rearward direction and the one or more breaker ribs 110 may extend from the base plate 112 toward the distal end 114 of the elongate body 106 in a second or forward direction, opposite to the first direction.

[0041] With reference to Figures 13 to 16, in one embodiment, the breaking component 102 is provided with a pod-shaped body 106 which tapers from a base 107 toward the distal end 114 of the body 106. Further, breaker ribs 110 of the breaking component 102 may be provided on the body 106 such that the taper angle of the ribs 110 with respect to the longitudinal axis of the breaking component 102 is substantially aligned with that of the tapered portion of the body 106. In this arrangement, the shape and configuration of the tapered body 106 advantageously reinforces the structural integrity of the breaker ribs 110 as the ribs are placed under compressive forces (when asserting pressure and breaking conduits 302) in use. It has been determined that the taper angle of the breaker ribs 110 with respect to the longitudinal axis of the breaking component 102 is an important factor in improving the effectiveness of the breaker component 102 in forcing apart conduits 302 during use. According to one configuration, and with reference to Figure 14, the taper angle of the breaker ribs 110 with respect to the longitudinal axis of the breaking component 102 is substantially 45°. In other configurations, the taper angle may be substantially 40°, 35°, 30° or 25°. In one configuration, the breaking ribs 110 are constructed from a hardened and/or long- wearing metal or alloy.

[0042] In a further embodiment, the breaking component 102 is fitted at the distal end 114, upstream of the breaking ribs 110, with an elongated nose member 111. The nose member 111 is configured to fit within the internal diameter of the existing conduit 302 so as to help feed the conduit 302 toward the breaking ribs 110 of the breaking component 102. In one configuration, the nose member 111 is provided at the distal end 114 with a collar 113, which is located between the nose member 111 and the breaking ribs 110. The collar 113 is configured with a tapered outer wall to help provide a transition of the conduit 302 from the nose member 111 to the breaking ribs 110. It has been determined that the nose member 111 and the collar 113 (either alone or in combination) are also important features in improving the effectiveness of the breaker component 102 in forcing apart conduits 302, in use. In one non-limiting example, the longitudinal length of the nose member 111 is substantially the same as the longitudinal length of the breaking component 102 between the distal end 114 and the base plate 112. The collar 113 also provides an added advantage of reducing the stress/force applied to the breaking ribs 110 from the conduit 302 (especially a lower portion of the breaking rib 110 which first receives the conduit 302) and thereby prolonging the life and effectiveness of the breaking ribs 110.

[0043] With reference to Figure 16, in one embodiment, the breaking component 102 is assembled by coupling two opposing halves by a hinge arrangement 103. In yet another embodiment, the nose member 111 is formed in two opposing parts, each secured to a corresponding section of the breaking component 102, and configured to be combined into a single member when the breaking component 102 is joined together. In one configuration, the hinge 103 is coupled to the respective breaking component 102 by way of fasteners and the hinge 103 is configured such that it is easily separable from the breaking component 102 for disassembly.

[0044] It is to be understood that in some embodiments, the breaking ribs 110, the nose member 111 and/or the collar 113 may be configured as modular, replaceable components. This modular design would advantageously reduce the cost of use as only the worn modular components would be replaced rather than having to replace the entire breaking component 102.

[0045] As shown in Figures 1 and 3A to 3D, the breaking component 102 may be divided or split along the longitudinal axis into two complementary parts, forming an upper breaking component portion 102A and a lower breaking component portion 102B. The upper breaking component portion 102 A and a lower breaking component portion 102B may be detachably or removeably connected or attached together. For example, the upper breaking component portion 102A and a lower breaking component portion 102B may be connected together by any suitable fasteners 118, such as a plurality of suitably positioned apertures and bolts.

[0046] The breaking component 102 may be arranged to be held in a relatively fixed and stable position in use. For example, in some embodiments, as shown in Figure 1, Figures 2A to 2C, and Figures 5A to 5C, the breaking component 102 is arranged to be connected or attached to a support structure 122, such as a shoring member. In some embodiments, a backing plate 120 may be employed for connecting or attaching the breaking component 102 to a support structure 122 (also shown in Figures 4A to 4C). For example, the backing plate 120 may be substantially U-shaped and configured to receive the proximal end 116 of the elongate body of the breaking component 102. As shown in Figure 1, Figures 2A to 2C and Figures 4 A to 4C, a plurality of apertures may be disposed on a major surface of the base plate 112, and extend through the base plate 112, and may align with corresponding apertures on the backing plate 120 and the support structure 122. In some embodiments, when in use, the proximal end 116 of the elongate body extends through the U-shaped backing plate 120 such that a surface of the base plate 112 is substantially flush with the backing plate 120 and a plurality of bolts or screws are inserted into the plurality of apertures and tightened to secure the breaking component 102 to the support structure 122.

[0047] Referring to Figures 1, Figures 2A to 2C, in some embodiments, the movable component 104 comprises a body 124 including a first conduit engaging portion 126 for engaging an existing conduit 302. For example, and as best illustrated in Figures 6 A to 6F, the first conduit engaging portion 126 may comprise a plurality of conduit engaging ribs 128 disposed about a shaft 130 and configured to frictionally engage with an internal surface of an existing conduit 302. In some embodiments, the ribs 128 may comprise a tapered portion 132 to facilitate engagement with the existing conduit 302. As shown, in some embodiments, the shaft 130 and ribs 128 may extend from a back wall, such as a first end plate 134 of a core section 138 of the body 124.

[0048] In other embodiments, the first conduit engaging portion 126 may comprise a substantially cylindrical chamber or sleeve (not shown) for receiving and engaging an existing conduit 302. For example, the chamber (not shown) may comprise a plurality of engaging ribs disposed about an internal surface of the chamber configured to frictionally engage with an external surface of an existing conduit 302. Alternatively, or in addition, a plurality of apertures (not shown) may be disposed along and/or about the chamber (not shown) for receiving frictionally engaging members (not shown), such as bolts or nubs, to frictionally engage with the existing conduit 302.

[0049] The first conduit engaging portion 126 is sized and shaped to cooperate with the size and shape of the existing conduit 302 to be broken. For example, the plurality of conduit engaging ribs 128 and the shaft 130 are configured to cooperate with an internal diameter of the existing conduit 302. Alternatively, in other embodiments, the chamber (not shown), and the plurality of engaging ribs (not shown) or apertures and corresponding frictionally engaging members (not shown) are configured to cooperate with an external diameter of the existing conduit 302. [0050] In some embodiments, the body 124 of the movable component 104 comprises a second conduit engaging portion 140 for engaging a replacement conduit 308 to be drawn by the movable component 104 into a position vacated by the existing conduit 302. For example, and as best illustrated in Figures 6A to 6F, the second conduit engaging portion 140 may comprise a substantially cylindrical chamber 142 or sleeve for receiving and engaging a replacement conduit 308. In some embodiments, a plurality of apertures 144 may be disposed along and/or about the chamber 142 for receiving frictionally engaging members 146 (Figures 1 and 2A to 2C), such as bolts or nubs, to frictionally engage with the replacement conduit 308. As shown, in some embodiments, the chamber 142 may extend from a back wall, such as a second end plate 136 (Figure 1) of the core section 138 of the body 124.

[0051] Alternatively or in addition to the plurality of apertures 144, the second conduit engaging portion 140 may comprise a plurality of engaging ribs (not shown) disposed about an internal surface of the chamber 142 configured to frictionally engage with an external surface of the replacement conduit 308. In some embodiments, the second conduit engaging portion 140 may comprise a plurality of conduit engaging ribs (not shown) disposed about a shaft (not shown) and configured to frictionally engage with an internal surface of a replacement conduit 308. For example, the ribs (not shown) may comprise a tapered portion (not shown) to facilitate engagement with the replacement conduit 308.

[0052] The second conduit engaging portion 140 is sized and shaped to cooperate with the size and shape of the existing conduit to be broken. For example, the chamber 142 and the plurality of conduit engaging ribs (not shown) may be configured to cooperate with an external diameter of the existing conduit 302. Alternatively, in the other embodiment, the plurality of conduit engaging ribs (not shown) and the shaft (not shown) may be configured to cooperate with an internal diameter of the replacement conduit 308.

[0053] In some embodiments, the first and second end plates 134, 136 are multi- faceted plates, each having a multi-faceted cross section. For example, as shown in Figure 1 and Figures 6A to 6F, the first and second end plates 134, 136 may comprise a dodecagon cross section.

[0054] In some embodiments, the core section 138 of the body 124 comprises a core shaft 148 and a plurality of vanes 150 extending along at least a portion of the core shaft 148 and disposed about the shaft 148. In some embodiments, the core shaft 148 of the core section 138 is an extension of the shaft 130 of the first conduit engaging portion 126. For example, the plurality of vanes 150 may be disposed in a space-apart manner about the core shaft 148 and in some embodiments, may be disposed substantially equidistant from one another. As shown in Figures 6A to 6E, the core section 138 may further comprise a beam 152 projecting from one or both of the major surfaces of one or more of the plurality of vanes 150 such that a major surface of each beam 152 is substantially aligned with a respective one of the faces of the multi-faceted plates 134, 136 of the core section 138.

[0055] In some embodiments, one or more apertures 154 may be disposed in the major surface of each beam 152 to allow a shroud 156 (Figure 1) of the movable component 104 to be secured to the body 124 using fasteners 162 (Figure 1), such as bolts or screws. For example, as shown in Figures 1, Figures 2A to 2C, and Figures 7A to 7E, in some embodiments, the movable component 104 may further comprise an outer sleeve or shroud 156.

[0056] The shroud 156 may be configured to removeably fit over or slide over the body 124 such that at least a portion of the first conduit engaging portion 126, the core section 138, and at least a portion of the second conduit engaging portion 140 are coaxial with and encircled by the shroud 156. In other words, the shroud 156 is configured to removeably receive at least a portion of the first conduit engaging portion 126, the core section 138, and at least a portion of the second conduit engaging portion 140 such that the at least a portion of the first conduit engaging portion 126, the core section 138, at least a portion of the second conduit engaging portion 140 are encompassed or encircled by the shroud 156. The shroud 156 may extend at least part way along the length of the body 124 and in some embodiments, may extend along the full length of the body 124 of the moveable component 104. For example, the shroud 156 may extend from a distal end 164 of the first conduit engaging portion 126, along the core section 138, to a distal end 166 of the second conduit engaging portion 140.

[0057] A plurality of apertures 158 may be provided in the shroud 156 and may be disposed along a length of the shroud 156 and/or about the shroud 156. The plurality of apertures 158 may be configured to removeably secure the shroud 156 to the body 124 of the moveable component 104. For example, at least some of the plurality of apertures 158 may be configured to correspond or align with respective apertures 154 of the beams 152 of the core section 138 and may be configured to receive fasteners 162, such as bolts, screws or nubs, to removeably secure the shroud 156 to the core section 138. In some embodiments, at least some of the plurality of apertures 158 may be configured to correspond or align with respective apertures 144 of the second conduit engaging portion 140 and may be configured to receive fasteners 146, such as bolts, screws or nubs, to removeably secure the shroud 156 to the second conduit engaging portion 140.

[0058] In some embodiments, the shroud 156 is formed from a single part. In other embodiments, the shroud 156 may be formed from two or more complementary parts, and each part may be independently and detachably or removeably connectable to the body 124 and in some embodiments, each part may be detachably or removeably connectable to each other. For example, in some embodiments, the shroud 156 is divided or split along the longitudinal axis and comprises two complementary parts, forming an upper shroud part and a lower shroud part. In some embodiments, the upper shroud part and the lower shroud part may be removeably or detachably connected or attached together.

[0059] In some embodiments, the shroud 156 comprises a multi-faceted cross section. For example, as shown in Figures 7 A to 7F, the shroud 156 may comprise a dodecagon cross section. The multi-faceted cross section of the shroud 156 is configured to cooperate with the first end plate 134 and the second end plate 136 of the body 124 of the moveable component 204. In some embodiments, the multi-faceted cross section is provided for ease of manufacture and in some embodiments, to provide a relatively flat face for receiving fasteners 146.

[0060] In some embodiments, a projection (not shown), such as a rib, extends radially about an internal surface of the shroud 156. A major surface of the projection (not shown) is configured to abut a major surface of the first multi-faceted plate 134 and assist in drawing the replacement conduit into position when the apparatus is in use.

[0061] Referring to Figures 1, Figures 2A to 2C, in some embodiments, the apparatus 100 further comprises a coupler 160 arranged to couple the movable component 104 to the connector 300 (Figure 12), such as one or more rods. The connector 300 (Figure 12) is configured to extend from the movable component 104 within and along a length of the existing conduit 302 and through the passage 108 of the breaking component 102 to a pulling device (not shown). In some embodiments, the coupler 160 extends from the distal end 164 of the first conduit engaging portion 126. In some embodiments, the coupler 160 comprises a uni-joint type coupler to allow swivel capability for the existing conduit 302 and/or replacement conduit 208. In some embodiments, the coupler 160 comprises a fixed coupler. In some embodiments, the coupler comprises an attachment portion 168 for attaching the coupler to the connector 300. For example, in some embodiments, the attachment portion 168 may comprises a threaded screw portion for cooperating with a corresponding treaded portion disposed on an inner surface of the connector 300, such as a rod connector.

[0062] Referring now to Figures 8, 9A to 9C, 10A to 10D and 11A to 11D, there is shown an apparatus 200 for breaking conduits, according to some embodiments. The apparatus 200 comprises the breaking head 102 and the coupler 160 of apparatus 200. Further, the breaking head 102 of apparatus 200 may be configured to connect or attach to the backing plate 120 and the support structure 122 described above in connection with apparatus 100.

[0063] The apparatus 200 further comprises a moveable component 204. The moveable component 204 comprises a body 124 corresponding to body 124 of apparatus 100 described above, a first shroud (or sleeve) 256 and a second shroud (or socket) 270.

[0064] The first shroud 256 may be configured to removeably fit over or slide over the body 124 such that at least a portion of the first conduit engaging portion 126 and at least a portion of the core section 138 are co-axial with and encircled by the first shroud 256. In other words, the first shroud 256 may be configured to removeably receive at least a portion of the first conduit engaging portion 126 and at least a portion of the core section 138 such that the at least a portion of the first conduit engaging portion 126 and the at least a portion of the core section 138 are encompassed or encircled by the first shroud 256. The first shroud 256 may extend at least part way along the length of the body 124 and in some embodiments, may extend from the distal end 164 of the first conduit engaging portion 126 and along substantially the full length of the core section 138.

[0065] In some embodiments, a plurality of apertures 258 may be provided in the first shroud 256 and may be disposed along a length of the first shroud 256 and/or about the first shroud 256. The plurality of apertures 258 may be configured to removeably secure the first shroud 256 to the core section 138 of the body 124 of the moveable component 204. For example, the plurality of apertures 258 may be configured to correspond or align with respective apertures 154 of the beams 152 of the core section 138 and may be configured to receive fasteners 260, such as bolts, screws or nubs, to removeably secure the first shroud 256 to the core section 138.

[0066] In some embodiments, the first shroud 256 is formed from a single part. In other embodiments, the first shroud 256 may be formed from two or more complementary parts, and each part may be independently detachably or removeably connectable to the body 124 and in some embodiments, to each other. For example, in some embodiments, the first shroud 256 is divided or split along the longitudinal axis and comprises two complementary parts, forming an first upper shroud part 256A and a first lower shroud part 256B. In some embodiments, the first upper shroud part 256A and the first lower shroud part 256B may be detachably or removeably connected or attached together.

[0067] In some embodiments, a projection 257, such as a rib, extends radially about an internal surface of the first shroud 256. A major surface of the projection 257 is configured to abut a major surface of the first multi-faceted plate 134 and assist in drawing the replacement conduit into position when the apparatus is in use.

[0068] Referring to Figures 8, 9A to 9C andl lA to 11D, the second shroud 270 may be configure to removeably fit over or slide over the body 124 such that at least a portion of the second conduit engaging portion 140 is co-axial with and encircled by the second shroud 270. In other words, the second shroud 270 may be configured to removeably receive at least a portion of the second conduit engaging portion 140 such that the at least a portion of the second conduit engaging portion 140 is encompassed or encircled by the second shroud 270. The second shroud 270 may extend from a distal end 166 of the second conduit engaging portion 140 to the core section 138 of the body 124 of the moveable component 204, and in some embodiments, may be configured to abut a major surface of the second multi-faceted plate 136. In some embodiments, the multi-faceted cross section is provided for ease of manufacture and in some embodiments, to provide a relatively flat face for receiving fasteners.

[0069] In some embodiments, a plurality of apertures 272 may be configured to correspond or align with respective apertures 144 of the second conduit engaging portion 140 and may be configured to receive fasteners 274, such as bolts, screws or nubs, to removeably secure the second shroud 270 to the second conduit engaging portion 140.

[0070] In some embodiments, the second shroud 270 is formed from a single part. In other embodiments, the second shroud 270 is formed from two or more complementary parts. Each part may be independently and detachably or removeably connectable to the second conduit engaging portion 140. Alternatively, the parts may be detachably or removeably connectable to each other, and at least one of the parts may be detachably or removeably connectable to the second conduit engaging portion 140.

[0071] In some embodiments, the first shroud 256 and the second shroud 270 may each comprise a multi-faceted cross section. For example, as shown in Figures 10A to 10D, and Figures 11A to 11D, the first shroud 256 and the second shroud 270 may comprise a dodecagon cross section. The multi-faceted cross sections of the first shroud 256 and the second shroud 270 are configured to cooperate with the first end plate 134 and the second end plate 136 of the body 124 of the moveable component 204.

[0072] With reference to Figures 17 to 19, in a further embodiment, the shroud 156 is arranged in the form of two opposing halves which can be assembled around the movable component 104, thereby securing both components. The shroud 156 is further provided with recesses 159A, 159B which correspond to projections 134 and/or 136 of the movable component 104 to help secure the shroud 156 against the moveable component 104 when assembled. In one configuration, the shroud 156 is also provided with an internal plate portion 157 which, when assembled, assists the movable component 104 in pushing the existing conduit 302 toward the breaking component 102 during use.

[0073] Figure 12 illustrates an installation 301 of the apparatus 100, 200 within an existing pipe network underground, according to some embodiments. In some embodiments, before installing the apparatus 100, 200 at a given site, an inspection of the existing conduit or pipe network is conducted to determine whether the existing conduit 302 to be removed is suitable for being removed using the apparatus 100, 200. For example, if the existing conduit 302 to be excavated is composed of asbestos and is cracked or broken, it may be determined that it is unsuitable for removal using the described apparatus 100, 200.

[0074] In some cases, it may be necessary to excavate three holes (pulling pits or pulling service holes) 310, 312, 314 to access the existing conduit 302, as shown in Figure 12. However, in many situations, service tapping holes may be employed as one or more of the three pulling service holes, 310, 312, 314. A portion of the existing conduit 302 in a first pulling service hole 310 is removed and a pulling device is set up. For example, the portion of the existing conduit may be removed by breaking off collars at each end of a segment of the existing conduit and lifting the conduit out from the first pulling service hole. Alternatively, the portion of the existing conduit may be removed by cutting the conduit, for example, with a circular saw. A collection receptacle or bag 306 may be installed at second pulling service hole 312 for collecting debris 304 from the existing conduit 306 as it breaks when contact is made with the breaking component 102 of the apparatus 100, 200. Connectors 300 are fed from the first pulling service hole 310 through the existing conduit 302, and through the second pulling service hole 312 to the third pulling service hole 314 (or entry hole). The breaking component 102 is installed at the second pulling service hole (service hole). In some embodiments, the upper breaking component portion 102A and a lower breaking component portion 102B are positioned on either side of the existing pipe 302 and connected or attached together, for example, using suitable fasteners 118.

[0075] The movable component 104 is connected to the existing conduit 302 and the replacement conduit 308 at the third pulling service hole (entry hole). In some embodiments, a first conduit engaging portion 126 is inserted into and received by the existing conduit 302 and the plurality of conduit engaging ribs 128 frictionally engage with the internal surface of the existing conduit 302, and the shroud 156 (or first shroud 256 for apparatus 200) fits over and may grip the outer surface of the existing conduit 302 to allow the existing conduit 302 to move in response to movement of the moveable component 104. In some embodiments, the replacement conduit 308 is inserted into and received by the second conduit engaging portion 140. In some embodiments, the plurality of apertures 144 disposed along and/or about the chamber of the second conduit engaging portion 140 receive frictionally engaging members 146 (Figures 1 and 2A to 2C), such as bolts or nubs, to frictionally engage with the replacement conduit 308 to allow the replacement conduit 308 to move in response to movement of the moveable component 104. The shroud 156 (or second shroud 270 for apparatus 200) may also fit over the replacement conduit 302 and assist with the movement of the replacement conduit 308 in response to movement of the moveable component 104.

[0076] The connectors 300 are attached to the movable component 104 at the third pulling service hole 314 (entry hole). In some embodiments, the connectors 300 are coupled to coupler 160 of the apparatus 100, 200. The connectors 300 are pulled from the first pulling service hole 310, for example by a pulling device (not shown), thereby pulling the movable component 104, 204 towards the breaking component 102. In response to the pulling of the movable componentl04, 204, the movable component 104, 204 progressively drives the existing conduit 302 toward the breaking component 102 along the longitudinal axis of the existing conduit 302 causing a distal end of the existing conduit 302 to engage with the breaking component 102 to break the existing conduit 302. For example in some embodiments, as distal end of the existing conduit 302 engages with the breaking component 102, the breaking component 102 is inserted into the existing conduit and the breaker ribs 110 exert an outward pressure on the internal surface of the existing pipe 302. As the existing pipe 302 is pushed further along the breaking component 102 and the breaker ribs 110, the combined diameter of the breaking component 102 and the breaker ribs 110 increases (for example, due to the fact that the breaker ribs 110 are tapered), thereby increasing the pressure being exerted on the internal surface of the existing pipe 302 to a point where the existing conduit 302 breaks. As the existing conduit 302 breaks, the debris or fragments 304 are collected in the collection receptacle 306.

[0077] Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present invention as it existed before the priority date of each claim of this application.

[0078] Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

[0079] It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the above-described embodiments, without departing from the broad general scope of the present disclosure. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.

Claims

CLAIMS:

1. An apparatus for breaking conduits, the apparatus comprising:

a breaking component having an elongate body defining a passage extending through the breaking component along the length of the elongate body;

a movable component, the movable component configured to engage with a proximal end of an existing conduit;

a coupler arranged to couple the movable component to a connector, the connector configured to extend from the movable component within and along a length of the existing conduit and through the passage of the breaking component to a pulling device; and

wherein the movable component is configured to progressively drive the existing conduit toward the breaking component along a longitudinal axis of the existing conduit in response to activation of the pulling device to cause a distal end of the existing conduit to engage with the breaking component to break the existing conduit.

2. The apparatus of claim 1, wherein the breaking component comprises one or more breaker ribs extending along at least a portion of the elongate body.

3. The apparatus of claim 2, wherein the one or more breaker ribs are tapered along at least a portion of their length toward a distal end of the elongate body.

4. The apparatus of any one of the preceding claims, wherein the one or more breaker ribs comprises a plurality of breaker ribs disposed in a spaced-apart manner about the elongate body.

5. The apparatus of any one of the preceding claims, wherein the breaking component comprises an upper breaking component portion and a lower breaking component portion arranged to be detachably connected together.

6. The apparatus of any one of the preceding claims, wherein the movable component comprises a body including a first conduit engaging portion for engaging an existing conduit, wherein the first conduit engaging portion comprises a plurality of conduit engaging ribs disposed about a shaft and wherein the plurality of conduit engaging ribs are configured to frictionally engage with an internal surface of the existing conduit.

7. The apparatus of claim 6, wherein the conduit engaging ribs comprise a tapered portion to facilitate engagement with the existing conduit.

8. The apparatus of any one of claims 1 to 5, wherein the movable component comprises a body including a first conduit engaging portion for engaging an existing conduit, wherein the first conduit engaging portion comprises a substantially cylindrical chamber configured for receiving and engaging the existing conduit.

9. The apparatus of any one of claims 6 to 8, wherein the body further comprises a second conduit engaging portion for engaging a replacement conduit to be drawn by the movable component into a position vacated by the existing conduit.

10. The apparatus of claim 9, wherein the second conduit engaging portion comprises substantially cylindrical chamber for receiving and engaging the replacement conduit.

11. The apparatus of claim 10, wherein a plurality of apertures are disposed along and/or about the chamber for receiving frictionally engaging members to frictionally engage with the replacement conduit.

12. The apparatus of claim 10 or 11, wherein a plurality of engaging ribs are disposed about an internal surface of the chamber and are configured to frictionally engage with an external surface of the replacement conduit.

13. The apparatus of claim 9, wherein the second conduit engaging portion comprises a plurality of conduit engaging ribs disposed about a shaft and configured to frictionally engage with an internal surface of a replacement conduit.

14. The apparatus of any one of claims 6 to 13, wherein the body of the movable component comprises a core section comprising a core shaft and a plurality of vanes extending along at least a portion of the length of the core shaft and disposed about the shaft.

15. The apparatus of claim 14, wherein the core section further comprises a beam projecting from one or both of the major surfaces of one or more of the plurality of vanes and wherein one or more apertures are disposed in a major surface of each beam to allow a shroud of the movable component to be secured to the body.

16. The apparatus of any preceding claim, wherein the apparatus further comprises a shroud configured to removeably receive at least a portion of the movable component.

17. The apparatus of claim 16, wherein the shroud comprises at least one projection extending radially about an internal surface of the shroud to assist in drawing the replacement conduit into position when the apparatus is in use.

18. The apparatus of claim 14 or 15, wherein the apparatus further comprises a first shroud configured to removeably receive and engage with the core section and at least a portion of the first conduit engaging portion, and a second shroud configured to removeably receive and engage with at least a portion of the first conduit engaging portion.

19. The apparatus of claim 18, wherein the first and second shrouds each comprise an upper shroud portion and a lower shroud portion arranged to be detachably connected together.

20. The apparatus of claim 18 or 19, wherein the first shroud comprises at least one projection extending radially about an internal surface of the first shroud to assist in drawing the replacement conduit into position when the apparatus is in use.

21. A method of breaking a conduit, the method comprising:

positioning a pulling device at a first pit;

feeding a connector through an existing conduit, from the first pit, through a second pit, to a third pit;

attaching a breaking component of the apparatus to the existing conduit and securing the breaking component to a support structure in a first pit;

connecting the connector to a coupler of a movable component of the apparatus; attaching a first engaging portion of the movable component to the existing conduit at the third pit;

activating a pulling device to cause the pulling device to pull the connector, thereby pulling the coupler and the moveable component, causing the movable component to progressively drive the existing conduit toward the breaking component along a longitudinal axis of the existing conduit and to cause a distal end of the existing conduit to engage with the breaking component to break the existing conduit.

22. The method of claim 21, further comprising attaching a second engaging portion of the movable component to a replacement conduit at the third pit such that the moving component progressively pulls the replacement conduit into a space vacated by the existing conduit as the existing conduit is being driven toward the breaking component.

23. The method of claim 21 or 22 further comprising positioning a receptacle in proximity to the breaking component in the second pit to collect debris from the existing conduit as it breaks on the breaking component.

24. A method of breaking a buried conduit, comprising: coupling a movable collar component to a distal end of the buried conduit; pulling the movable collar to advance the conduit toward and onto a stationary breaking component to progressively break the conduit from a proximal end of the conduit to the distal end of the conduit.

25. The method of claim 24, wherein the breaking component is configured to cause the conduit to break outwardly as the conduit is advanced onto the breaking component.

26. The method of any one of claims 21 to 25, wherein the method uses the apparatus of any one of claims 1 to 20 to break the conduit.