WO1990006190A1

WO1990006190A1 - Apparatus for use in and a method of removing asbestos

Info

Publication number: WO1990006190A1
Application number: PCT/GB1989/001450
Authority: WO
Inventors: Graham James Gwilliam
Original assignee: Graham James Gwilliam
Priority date: 1988-12-08
Filing date: 1989-12-05
Publication date: 1990-06-14
Also published as: GB2226878B; JPH04502272A; GB2226878A; CA2004577A1; EP0447480B1; EP0447480A1; ATE110597T1; DE68917936D1; AU622747B2; AU4741590A; GB8828693D0; GB8927454D0

Abstract

The apparatus is for use in removing asbestos or other harmful materials from pipes or other elongate members, and comprises a flexible bag (10), which is made at least in part of transparent plastics material and which can be mounted on a pipe (12), and a cage (11) for supporting the bag clear of an area of the pipe to be stripped. The bag has two sleeve portions (10b) which can be sealed to the pipe in spaced relationship with respect to one another and an openable seam (13) extending along and betwen the two sleeve portions. The cage is made of a plurality of parts (20) which are releasably connected together so that they can be assembled about the pipe.

Description

Apparatus for Use in and a Method of Removing Asbestos

This invention relates to apparatus for use in and a method of removing asbestos or other harmful material from pipes or other elongate members (hereinafter for convenience referred to only as pipes) .

As is well known, asbestos dust is extremely dangerous to human beings and strict regulations govern the removal of asbestos from surfaces to be stripped.

Asbestos stripping normally takes place in sealed enclosures erected around the surface to be stripped and in which an operative works. Very often small jobs do not warrant the time involved in erecting such an enclosure and in these circumstances it is known to mount a small plastics bag on an area of a pipe to be stripped, the bag having sleeve portions which can be closed around the pipe and a body portion integral with. and depending from the sleeve portions. However, these bags suffer from the drawback that they rest on the pipe and become contaminated with asbestos dust so that it is impossible to clean off the pipe when the asbestos lagging has been removed. Also, it is not possible to reduce the interior of the bags to a sub-atmospheric pressure as to do so would cause the bag to cling to the pipe.

According to a first aspect of the present invention there is provided apparatus for use in removing asbestos or other harmful material from pipes, comprising. a flexible bag, which is made at least in part of transparent plastics material and which can be mounted on a pipe, and a cage for supporting the bag clear of an area of the pipe to be stripped, the bag having two sleeve portions which can be sealed to the pipe in spaced relationship with respect to one another and an openable seam extending along and between the two sleeve portions, and the cage being made of a plurality of parts which are releasably connected together so that they can be assembled about the pipe.

Preferably, the seam is closable by sliding clasp fastener means.

Preferably, the bag is provided on its external surface with means for attaching the bag to the cage. Such means may be in the form of tags which together with the bag define sleeves for receiving individual parts of the cage.

Preferably, the bag has two hand receiving pockets which may be in the shape of gauntlets and which allow an operative access to an area of the pipe within the bag. The bag may also have a vacuum connector for connecting a source of negative pressure to the interior of the bag and/or a water supply connector enabling water to be sprayed on asbestos lagging on the pipe.

According to a second aspect of the invention, there is provided a method of removing asbestos or other harmful material from pipes using apparatus according to the first aspect of the invention, comprising the steps of mounting the flexible bag on the pipe, assembling the cage on the pipe and fixing the bag to the cage, sealing the bag to the pipe, and stripping asbestos from the pipe using one or more tools contained within the bag.

Preferably, the interior of the bag is connected to a source of negative pressure during the stripping operation.

Preferably, the asbestos is wetted prior to being stripped from the pipe.

The invention will now be more particularly described with reference to the accompanying drawings, in which:-

Figure 1 is a perspective view of one embodiment of apparatus according to the first aspect of the invention, assembled on a pipe to be stripped of asbestos, Figure 2 is a perspective view of another embodiment of apparatus according to the first aspect of the invention, assembled on T-junction pipes to be stripped of asbestos,

Figures 3a and 3d show various connectors used to connect together the parts of the cage of Figure 1 or Figure 2, and

Figure 4 is a perspective view of apparatus similar to that shown in Figure 1 with- parts omitted for clarity, but showing a pair of gauntlets. Referring firstly to Figure 1 of the drawings, the apparatus shown therein comprises a flexible bag 10 made of transparent plastics material, e.g. polyethylene, and a cage 11 for supporting the bag 10 clear of an area -4-

of a pipe 12 to be stripped.

The bag 10 comprises a body portion 10a and two sleeves 10b separated from one another by the body portion 10a. An openable seam 13 extends along the length of each sleeve 10b. and between the sleeves along the top of the body portion 10a.. The seam 13 is closed by an air¬ tight (or substantially air-tight) plastics sliding clasp fastener 14.

Tags 15 are attached to the external surface of the bag 10 and the tags 15 together with the plastics material of the bag define sleeves 16 for receiving parts of the cage 11.

The bag 10 also has two hand receivable pockets 17, which extend into the bag 10 and which are preferably in the shape of gauntlets as shown in Figure 4, a vacuum connector 18, and a water supply connector 19, all welded to the bag.

The cage 11 comprises a plurality of rigid tubes, which may be box-section tubes 20, and a plurality of connectors 21, 22, 23 and 24 (see Figures 3a to 3d). The cage 11 is made up of three rectangular frame sections 11a* lib and li. spaced apart in the direction of the longitudinal extent of the pipe 12 and joined one to another by four tubes 20. The central frame section lib is itself made up of four tubes 20 joined together at the four corners of the frame by connectors 21 (see Figure 3aJ having a body part 21a and four projections 21b - 21e, the projections 21b_ and 21≤ being push-fitted in the ends of two tubes 20 of the frame section lib and the projections 21d_ and 21e. being push-fitted in the ends of two tubes 20 connected respectively to the frame sections 11a and lie. The frame sections 11a and lie are each made up of four outer tubes 20 which are joined together at the corners by connectors 22 (see Figure 3b) having a body part 22a and three projections 22b - 22d, and two short inner tubes 20. The inner tubes 20 extend between respective connectors 24 (see Figure 3d) on the two vertical outer tubes 20 and the connector 23 (see Figure 3c) on the uppermost outer horizontal tube 20, to provide within the upper end of the rectangular frame section an inverted V-shaped support 25 which rests on the pipe 12 to support the uppermost, tube 20 clear of the pipe 12. The connectors 23 and 24 each include a sleeve 23a and 24a, respectively which is slidable over an outer tube 20, and connector 23 has two projections 23b and 23c which are push-fitted in ends of the two inner short tubes 20, whereas each connector 24 has a single projection 24b which is push-fitted in the other end of a respective short inner tube 20.

When it is desired to strip insulation from an area of a pipe 12, the bag 10 is mounted on the pipe from below and the seam 13 is closed by the sliding clasp fastener 14. The sleeves 10b are then each folded over and sealed to the pipe 12 by tape 26.

After mounting the bag 10 on the pipe 12, the cage is assembled and during assembly many of the tubes 20 are passed through respective sleeves 16 on the bag 10 so that the body portion 10a, of the bag 10 is supported by the cage 11 clear of the pipe 12. .

A source of negative pressure, e.g. an "H" type vacuum cleaner or vacuum interceptor is connected to the connector 18. The asbestos cladding on the pipe 12 is then removed using one or more tools (not shown) contained within the bag 10, access to the tools being gained by the hands of an operative being placed in the hand receiving pockets or gauntlets 17.

If it is desired to wet the asbestos prior to stripping, a water jet can be connected to the connector 19.

The bag 10 and cage 11 can be of any desired size to suit the dimensions of a pipe or other elongate member to be stripped and can be used to remove not only asbestos but also other harmful materials.

The apparatus can be used to strip vertical as well as horizontal pipes, but in this case it is desirable to provide an additional hand receivable pocket in the bag 10 on the side thereof opposite to the pockets 17.

The apparatus may also be used to strip T-junction pipes as shown in Figure 2 and in this case the bag 10• must be provided with a third sleeve 10c which is joined to each sleeve lOfe by an openable seam. Also, in this case the cage 11* is of T-shaped construction and the bag 10' has two pairs of hand receivable pockets 17a and 17fe, respectively. The above embodiments are given by way o example only and various modifications will be apparent t persons skilled in the art without departing from th scope of the invention as defined in the appended claims For example, not all of the bag 10, 10' need b transparent; it could instead just have one or mor transparent windows so that an operative can see to stri the asbestos from the pipe. In this case, a main part o the bag could for example be of "Valeron", a very strong, but not optically transparent, plastics material availabl from Van Leer Flexibles Ltd., of Poole, Dorset, England, and the transparent window or windows could be o polyethylene. Also, the slidable clasp fastener could b replaced by any other appropriate fastener, ^"such as a hoo and eye fastener of the type sold under the name "Velcro (RTM) .

Claims

1. Apparatus for use in removing asbestos or other harmful material from pipes, comprising a flexible bag, which is made at least in part of transparent plastics material and which can be mounted on a pipe, and a cage for supporting the bag clear of an area of the pipe to be stripped, the bag having two sleeve portions which can be sealed to the pipe in spaced relationship with respect to one another and an openable seam extending along and between the two sleeve portions, and the cage being made of a plurality of parts which are releasably connected together so that they can be assembled about the pipe.

2. Apparatus as claimed in Claim 1, wherein the seam is closable by sliding clasp fastener means.

3. Apparatus as claimed in Claim 1 or Claim 2, wherein the bag is provided on its external surface with means for attaching the bag to the cage.

4. Apparatus as claimed in Claim 3, wherein said attaching means comprises tags which together with the bag define sleeves for receiving individual _ parts of the cage.

5. Apparatus as claimed in any one of Claims 1 to 4, wherein the bag has two hand receiving pockets which allow an operative access to an area of the pipe within the bag.

6. Apparatus as claimed in Claim 5, wherein the pockets are in the shape of gauntlets.

7. Apparatus as claimed in any one of Claims 1 to 6, wherein the bag has a vacuum connector fo connecting a source of negative pressure to the interio of the bag.

8. Apparatus as claimed in any one of Claims 1 t 1 , wherein the bag has a water supply connector enablin water to be sprayed on asbestos lagging on the pipe.

9. A method of removing asbestos or other harmfu material from pipes using apparatus according to any on of the preceding claims, comprising the steps of mountin the flexible bag on the pipe, assembling the cage on th pipe and fixing the bag to the cage, sealing the bag^* t the pipe, and stripping asbestos from the pipe using on or more tools contained within the bag.

10. A method as claimed in Claim 9, wherein th interior of the bag is connected to a source of negativ pressure during the stripping operation.

11. A method as claimed in Claim 9 or Claim 10, wherein the asbestos is wetted prior to being strippe from the pipe.