5m Dragbox User guide page 1
Contents
1. Base Boxes Mabey Hire will normally supply the 5m drag boxes completely pre assembled to the width required for immediate installation in the trench Top Extensions These will normally be supplied pre assembled Clients need to allow for the top extension to be connected onto the base box on site NOTE Clients should not normally attempt to dismantle and assemble base or top extension boxes themselves on site 6 6 Return of Equipment Off Hire Clients should ensure that on removal the equipment is returned in sections as supplied 6 7 Slinging of 5m Dragbox See pages 1 2 and 3 for weights 6 7 1 Off Loading Reloading Lorry in 6 7 2 Standing Pre assembled Base and Extension Box a Boxes Upright Pre assembled in Depot Use 2 No lifting points Use 4 leg chain sling provided Lift by upper JCBP 037 connected to panel only lifting points as shown 6 7 4 Connection of Top extension Use lifting points provided Stand base box upright in partly dug trench Lower pre assembled top extension onto base box and fit 4 No connector pins and R clips Page 4 of 6 6 7 3 Lifting Pre assembled Boxes When in Upright Position Base and Extension Use the 4 No lifting points provided product user guide me om Standard Pinned Strut Dragbox System pate April 2013 7 Use of Standard Dragbox 7 1 Preliminaries 7 1 1 Check all bolts are fitted and tight before lifting box into trench 7 1 2 Check all pins c w R clips2. climb up or down the struts 7 3 2 Do not use any unsupported part of the trench for access 7 3 3 Do not move the box when personnel are inside 7 3 4 Wear a safety helmet to minimise risk of head injury 7 3 5 Ensure that the excavator operator is aware of your intentions 7 4 Operation 7 4 1 Before entering the working space within the Dragbox a Prepare the pipe bedding material b Lift a section of pipe into the trench 7 4 2 Enter the working space and complete installation of the pipe section by joining onto previously laid sections Restrain the pipe section to prevent displacement whilst dragging the Dragbox along the trench 7 4 3 Exit from the working space 7 4 4 Drag the box forward by hooking the bucket round the front strut of the box Use the hydraulics of the excavator for this rather then moving the machine on its wheels tracks 7 4 5 Backfill the trench behind the Dragbox 7 5 Extraction 7 5 1 Lift the Dragbox from the trench with excavator or suitable craneage using 4 leg chain JCBP 037 connected to lifting points 7 6 Site Storage Stability Considerations 7 6 1 Dragboxes should be stored laid on their side when not in use Uneven or sloping ground and or wind loading can result in inadequate stability if left standing upright Page 5 of 6 product user guide p mjalbjely gt me om Standard Pinned Strut Dragbox System pate April 2013 7 1 Trench Reinstatement 7 7 1 Users should note that some settlemen
3. guide p mlalblely airs me om Standard Pinned Strut Dragbox System pate April 2013 6 Off Loading Site Handling and Assembly of Standard Dragbox General Guidance Notes 6 1 Manpower The Health and Safety Regulations require that personnel deployed are suitably trained experienced and supervised by a competent person 6 2 Plant for Lifting A suitable appliance is required for off loading and assembly if required The machine lifting capacity and clearance under the lifting point should be checked against the sizes and weights of the dragbox to be lifted assembled 6 3 Tools and Lifting Chains available from Mabey Hire Ltd 6 3 1 Podgers Spanners for making bolted connections M20 amp M30 bolts 6 3 2 Lifting chains of suitable length and capacity complete with current certification Typically a set of 4 leg 13mm chains with 4 0m leg length complete with shortening clutches and safety hooks Code JCBP 037 weight 84kg Refer to Lifting Chain User Information for more details 6 4 Access and Hard Standing Areas These include 6 4 1 Suitable area to off load the lorry and assemble the Dragbox 6 4 2 Suitable hard standing for the machine to operate to lift the box into the trench 6 4 3 Suitable access equipment ladder or staging for attaching lifting chains and connecting top extension to base box 6 4 4 Ladders and possibly other provisions to provide safe access into and out of the trench 6 5 Supply of Equipment to Site
4. are fitted before lifting box into trench 7 1 3 A suitable excavator is required as a guide the manufacturer s quoted digging force should be at least 5 x the weight of the dragbox equipment in use 7 2 Installation 7 2 1 Excavate initial section of trench Lift dragbox into trench using excavator or crane 7 2 2 The Dragbox must NOT be pushed down into the trench using a dig and drive method 7 2 3 Always maintain a safe batter of the unsupported parts of the trench in front of and behind the box 7 2 4 Fill any voids on outside of panels so that the box cannot be pushed sideways by any soil movement Ensure the box is installed vertically 7 2 5 Allow for at least 100mm of projection of top of box above ground level to prevent debris rolling into excavation 7 2 6 DO NOT leave the base of the box flying above the excavation level Correct Incorrect tt i et ai pils ETET DO NOT leave the Always maintain a safe batter of the unsupported excavation level is voids between the box base of the box flying parts of the trench in front reached and the box panel and the trench sides above the excavation of and behind the box sunk to the required as this may cause the box level depth ensure that the to move sideways box is vertical 7 3 Entering the Supported Excavation 7 3 1 Use a ladder to enter the working space between the struts of the Dragbox Do not
5. aring soils or in trenches crossed by frequent services It is assumed that clients are familiar with general safe practices applicable to the use of Dragboxes All major components of the Dragbox System have lifting points for safe slinging The Dragbox is not intended for any other purposes 2 Design aye JKN In the event of trench wall instability the Dragbox is designed to carry a uniform erdund gt lateral earth pressure of 35kKN m Users are advised to check that their excavation Level fai arrangement will not impose greater working pressures than this Conditions which gt will increase the likelihood of trench wall instability and lateral earth pressures are iti Fa a Close proximity of structures Beatle Ea b Excavated or construction materials adjacent to the trench c Close proximity of site roads i _ i Excavation d Close proximity of railways Lavel z Y gt 3 Identification of Components 5m Top Extension ane A i Weight 1160 Kg ri i a Me 9 Left Handed Panel Shown wa So Code DBX TPNLS5LH wa Oy fai Right Handed Fanel Lo os d J 4 Code DBX TPNL5RH Pinned Front Strut Inner Pinned Rear Strut Inner Rear Strut Spacer P Code DPSF INNER Code OPSR INNER Code DSR S r Size 458 x 300 x 174 Size 320 x 200 x 155 Size 320 x 320 x 160 Weight 44 5 Kg Weight 13 2 Kg Weight 27 Kg ral Cap D m 5m Base Panel Extension to Base Panel Connector Pin Rear Strut Pin Cod
6. e 5m Standard Pinned Strut Dragbox System se g ae April 9013 4 1 High Clearance Base Boxes Using Hogback Struts 450 450 325 aa B 325 4 x E Sri n NE HBACK 460EXT 325 p m 325 2480 4 2 Details of Hogback Units Used at Rear Strut Position on Base Box Only 4No 1360 gt p DSR 5 a 900 e 450 460 450 480 960 450 per Unit Pi a 7 M20 x 80 M20 x 60 H long bolts 10 lang an per joint per side N i Type A Type B Type C 2 off DS HB VP 4 off DOSR S 2 off DS HEB VP 1 off OS HB 2 off DS HB VP 1 off DS HB Weight 348 kg 450EXT 4 off DSR 3 950EXT 4 off DSR S Weight 439 kg Weight 510 kg 5 Sizes and Quantities of Struts Required to make up particular sizes of Dragbox Note 1 Always allow sufficient clearance for excavator bucket to work comfortably within internal width of side panels when selecting a box size 2 Non standard equipment may be available if other widths required Front Strut Outer Rear Strut Outer Top Extension Box rok i foxes sa 3687 T oextessa 2576 1 poxes sxa seri pextes set 200s DexPs 5x5 3912 DexTPsS 5x5 2638 Deres sowo OBxTPS x7 20e _DexPS 5x8 4027 DEXTPS 5x8 2724 exes sio a007 pexs Sao 2778 DEX TFS 5x11 NIA DBXPS 5x13 4319 WA DBXPS 5x14 4459 Page 3 of 6 product user
7. e DPSR PIN Front Strut Pin Code DPSF PIN size 35 dia x 245 Size 50 dia x 260 Code DBX PIN Weight 2 0 Kg Weight 3 9 Kg Size 35 dia x 115 Weight 1 0 Kg Weight 1760 Kg Left Handed Panel Shown f Code DBX PNL5LH Right Handed Panel Code DBX PNL5RH 2 48m a Page 1 of 6 66 5 Aac 204 Hogback Spacer DS HB 450EXT DS HB 950EXT 460 960 1500 See Table in section Rear End Elevation Page 2 of 6 Weight Kg Top Extension to Base Connection O35 pin and R F clip DBX PIN Ale 2 per side 210 Front Struts 4000 1000 Front strut inner to Panel Connection M30 x 160 long bolts 4 per side Front strut inner to Outer Connection DPSF PIN 2 per side Front End Elevation Pinned Rear Strut Outer Length Weight DPSR 04aM a20 187 DPsRo72m 720 346 DPSR 102m 1020 505 OPSR 1 17M 170 584 re ra J r p ppr TP j F Hogback Post r Code OS HB VP p S Size 1250 x 450 x 320 Weight 120 Kg H H rt m H yE a J Top extension panel connection a W Ts H a HA R No a Top and bottom lifting points Side Elevation TT a Rear strut Inner to Panel Connection M20 x 60 Long bolts 12 per side base panel 6 per side extension panel Rear strut Inner to Outer Connection DPSR PIN 1 per side Plan product user guid
8. e the box struts ALWAYS Consult a qualified person if there is any doubt about ground pressures 9 References CIRIA Report 97 Trenching Practice 10 GENERAL Since our policy is one of continual improvement components may vary in detail from the descriptions given in this publication Page 6 of 6
9. product user guide om Standard Pinned Strut Dragbox System Contents SUA Date April 2013 Introduction Design Identification of Components Identification of Components Cont d Dimensions and Connection Details Sizes and Quantities of Struts Required to make up particular sizes of Dragbox Off loading Site Handling and Assembly of Standard Dragbox General Guidance Notes Use of Standard Dragbox Summary Do s and Don ts References General Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 1 Introduction This booklet is intended to provide basic information for users of the Mabey 5m Long Standard Pinned Strut Dragbox system and to draw the clients attention to the practical aspects of handling assembly installation and use which need to be considered in compiling a safe system of work In particular the clients attention is drawn to the size and weights of the Dragbox components and the need for planning the lifting operations involved The Dragbox is intended to act as a shield to provide a safe working area for operatives working in a trench It is not intended to provide significant support to the trench sides and is therefore intended for use only in dry stable ground which stands to the excavated depth It can then be dragged along a pre dug trench Users should ensure that the length and selected width of the box is sufficient for the work to be carried out Dragboxes are not normally suitable for use in water be
10. t of the reinstated ground and ground adjacent to the Dragbox is likely to occur after backfilling 7 8 Maintenance 7 8 1 Keep all nuts and bolts tight 7 8 2 Damaged struts must not be used 7 8 3 We regret that we are unable to provide staff to change boxes from one size to another on site IF INDOUBT CONSULT MABEY HIRE LTD 8 Summary DO S AND DONT S DO Ensure that all operatives are familiar with the safety and operating instructions DO Take care not to overstress the boxes watch for bowing of the panels DO Check that all nuts and bolts are tight but not over tightened DO Check all pins and R clips are fitted DO Follow the basic maintenance instructions DO Use a ladder to enter the box DO Wear a safety helmet DO Use suitable 4 leg slings and lifting equipment DO Provide a landing below the top of the box This will prevent debris rolling down onto personnel inside the box DO Always maintain a safe batter of the unsupported parts of the trench in front of and behind the Dragbox DO Store boxes on their side DON T Move the box with personnel inside DON T Hammer the box with the bucket DON T Use lifting lugs for other than loading unloading or assembly purposes DON T Use damaged struts DON T Use spacer combinations other than those recommended by Mabey Hire Ltd DON T Use unsafe lifting equipment DON T Enter unsupported parts of the excavation DON T Sit astrid
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