Plastiline™ - Humes

More documents

Recommendations

Info

8.7 When required by the client, at the commencement and completion of the welding of each joint a 50mm length of unfused welding strip can be provided to form a test tab. 8.9 Where sewer lines incorporate maintenance holes the components can be supplied precast and lined with Plastiline. These include the shaft, slab, riser and top. 8.8 Special pipe joints are available for small diameters in some applications. NOTE: Shafts, chambers and risers are 360º lined. Keys run circumferentially and sections of keys are removed to create weep channels as per Clause 9.3. *Denotes field operation 12
9 Incorporation of keyed Plastiline in cast insitu concrete structures 9.1 The Plastiline must cover the areas specified and is secured to the inner formwork face prior to placing the concrete and reinforcement. Formwork used must be suitable for proper attachment of the plastic sheet. The preferred method of attachment of the sheet is by nailing or stapling directly to timber forms, or to timber nailing strips set in steel forms at the appropriate positions. Nails shall be of approved small flat-headed type. All fasteners must be placed within 7mm of the edge of the sheet so that holes will be covered by the welding strip. If it is necessary to secure a joint flap a temporary form support must be used and the flap must be fastened within 7mm of its edge. Alternatively, it can be held to steel forms by light metal or plastic bands tightened on to suitable attachments to the forms. Provision must be made to maintain the sheet in close contact with the form during concrete placement. Bands must be of the type recommended by Humes. If the bands cross the keys, provision must be made to ensure that the keys are not bent or distorted. All pipe or other metal inserts must be held firmly in place on the formwork and, where required, the Plastiline protection of these inserts must first be installed. Metal form ties shall be kept to a minimum. 9.2 In the case of large floors or the bottoms of large tanks etc the alternatives are: i) Where there is no external hydrostatic head or other potential uplift, plain Plastiline sheet or blankets can be loose-laid or bonded to the base slab with an adhesive approved by Humes. ii) Where the base can be subject to pressure from external ground water, Plastiline should be embedded into the top of the slab, using a vibrating screed. This vibrator is applied after bleeding has ceased, but before initial set occurs. As it is essential to insert the keys before the concrete hardens, it may be necessary to limit the area of each pour. iii) After vibrating the Plastiline into position, if sheets/blankets overlap, care must be taken to ensure concrete mortar is cleared from welding areas prior to the complete hardening of the concrete. 9.3 Unless otherwise specifically indicated, Plastiline blankets shall be positioned so that the locking keys are vertical or as near vertical as possible to provide a free escape to the bottom of fluid which may accumulate between the lining and wall of the structure. Where the locking keys cannot be positioned vertically a gap of between 75mm and 100mm width shall be provided by cutting off the locking keys at intervals not greater than 2.5m longitudinally, to provide weep channels. A weep channel shall be provided approximately 300 mm away from all lining returns. Where changes in direction or corners are encountered, the Plastiline may be bent and secured to the form, provided the radius of the blend is not less than 25mm. Where sharper corners are specified, a jointing method approved by Humes must be used. 9.4 For lining joints which do not correspond to joints in the concrete structure, the Type C3 joint is preferred. For this joint the Plastiline sheets are butted together, so that the gap between sheets and/or blankets at any position does not exceed 4mm. This gap must be temporarily sealed by a wide PVC tape before placing concrete. After form removal a flat welding strip, centred over the gap, is welded to give a permanent and continuous lining on the inside of the structure. As an alternative, the lap joint Type C2 may be used. This joint requires that the Plastiline be lapped at least 35mm, the overlap or flap being on the downstream side of the joint. A Type C2 joint must be at longitudinal construction joints in concrete structure. For Plastiline lining joints at transverse construction or contraction joints in the concrete structure, a Type C1 joint must be used. Normal jointing method C1 This is identical with type P1 Normal jointing method C2 Note: Type C1 Joint is identical with type P1 Min. overlap 35mm Flat Welding Strip Direction of flow PVC Tape Use seam weld or apply pvc tape before placing concrete. Method of jointing Plastiline in structure without joint. Not to be used where transverse construction or contraction joint occurs. Shall be used where a longitudinaL construction joint intersects with a joint in the Plastiline. Normal jointing method C3 Apply welding strip after stripping formwork Plastiline Method of jointing sheet, except where construction or contraction joint occurs, should be used when longitudinal construction joint intersects with a joint in the Plastiline. Shall not be used where transverse construction or contraction joint occurs. 13
Page 1 and 2: Plastiline BUILD ON OUR EXPERTISE
Page 3 and 4: INTRODUCTION 1 The material and its
Page 5 and 6: SUMMARY OF PRINCIPAL PROPERTIES 1 T
Page 7 and 8: Industrial waste lines Where such p
Page 9 and 10: 1 Composition 1.1 All Plastiline sh
Page 11: 8 Laying and jointing of pipes line
Page 15 and 16: 10 Jointing of precast products (in
Page 17 and 18: 11 Testing 11.1 Prior to conducting
Page 19 and 20: 13.3 During loading, transporting,

Plastiline™ - Humes

Create successful ePaper yourself

Delete template?

Save as template?