7m Dragbox User guide page 1.psd
Contents
1. 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 astride 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 62. Pin Rear Strut Pin Rear Conn Strap 5 7m Base Panel Code DPSF PIN Code DPSR PIN Code DBX RCS N Code DBX PNL7 Size 35 dia x 245 Size 50 dia x 260 Size 225 x 100 x 30 Weight 2050 Kg Weight 2 0 Kg Weight 3 9 Kg Weight 5 Kg i Page 1 of 6 product user guide QIEEEM gt Title 7m Standard Pinned Strut Dragbox System August 2012 3 Identification of Components Cont d Pinned Front Strut Outer Length Weight DPSF 0 31M DPSF 0 46M 8 5 610 6 5 760 1360 DPSF 0 76M DPSF 0 6iM 610 865 7o 105 DPSF 091M DPSF 1 06M DPSF 1 21M 1 DPSF 1 36M 1360 1 3 DPSF 1 66M 1660 0 DPSF 1 51M OPSF 2 16M Pinned Rear Strut Outer Length Weight Code 10 7 187 26 6 50 5 N71 1807 N 58 77 B5 m3 Afw N n o Hogback Spacer Length Weight AZ L mm Kg gt i i Hogback Post DS HB 450EXT 460 90 Code DS HB VP i lt Size 1250 x 450 x 320 DS HB 950EXT 960 160 _ p Weight 120 Kg 1070 gt Upper panel connection points Upper to Lower panel connection 1 off conn strap 2 off M30 x 110 bolts per side 1 off Front conn plate 8 off M20 x 75 bolts per side Front Struts ae 2000 gt 4000 Top and bottom lifting points Front End Side Elevation Elevation Rear Struts a Front strut inner to Panel Connection M30 x 160 long bolts 4 per side Front strut inner to Outer Connection DP
3. 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 QIEEEM gt Ne 7m Standard Pinned Strut Dragbox System oa August 2012 7 7 Trench Reinstatement 7 7 1 Users should note that some settlement 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 IN DOUBT 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
4. the base of the box flying above the excavation level Correct Incorrect mete t a E oe rash oO pk ae Always maintain a safe Ensure that there are no DO NOT leave the 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 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
5. 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 28 0 to In the event of trench wall instability the Dragbox is designed to carry a als uniform lateral earth pressure of 28 0kN m2 when using hogback rear struts Ground and 34 1kN m when using standard rear struts Users are advised to check that their excavation arrangement will not impose greater working pressures mi N n H u gt gt gt gt gt than this Conditions which will increase the likelihood of trench wall instability pts a E a f and lateral earth pressures are Pressure f Sa gt a Close proximity of structures gt x b Excavated or construction materials adjacent to the trench Excavation z c Close proximity of site roads Level gt d Close proximity of railways y 3 Identification of Components 4 Pinned Front Strut Inner Pinned Rear Strut Inner Rear Strut Spacer Front Conn Plate Code DPSF INNER Code DPSR INNER Code DSR S Code DBX FCP Size 458 x 300 x 174 Size 320 x 200 x 155 Size 320 x 320 x 160 Size 370 x 280 x 20 Weight 44 5 Kg Weight 13 2 Kg Weight 27 Kg Weight 16 Kg Pe a i a w oa i A A A i ee E ial r a CDP wz 4 Front Strut
6. SF PIN 2 Rear strut Inner to Panel Connection per side M20 x 60 Long bolts 12 per side base panel Rear strut Inner to Outer Connection Front End Elevation Showing DPSR PIN 1 per side Upper Box Connected See Table Plan Rear End Elevation Page 2 of 6 000 __ 2200 1270 e e product user guide QIEEEM gt Ne 7m Standard Pinned Strut Dragbox System oa August 2012 4 1 High Clearance Base Boxes Using Hogback Struts 325m j lt 900 lt 325 SS coee 325 325 e perja 325 meg iA S HBACK Re 460EXT j 24 H BACK 3 ap 2 960EXT 4 2 Details of Hogback Units Used at Rear Strut Position on Base Box Only 4No 1360 gt 1860 DSR S 900 450 gt 460 450 gt 450 lt 960 450 er Unit TT T ny i P T M aT rs E P P ee i M20 x 60 a i long bolts 10 p u long bolts 44 H i per joint per side T Type A Type B Type C 2 off DS HB VP 4 off DSR S 2 off DS HB VP 1 off DS HB 2 off DS HB VP 1 off DS HB Weight 348 kg 450EXT 4 off DSR S 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 stan
7. dard equipment may be available if other widths required Front Strut Outer Rear Strut Outer Base Box Internal pire No Reqd No Reqd Kit Ref Weight Width mm mm Base Base No Q 942 310 270 DBXPS 7x1 4341 DBXPS 7x3 4417 760 DBXPS 7x4 4451 O BXPS 7x5 4492 DBXPS 7x6 4526 BXPS 7x7 4560 DBXPS 7x8_ 4607 1470 DBXPS 7x9 4643 DBXPS 7x10 4677 2120 DBXPS 7x11 4800 With Hog Back Struts Rear Strut Base Box Only 1550 1842 1210 1 900 1 A DBXPS 7x12 4686 4878 5020 q1 DBXPS 7x13 DBXPS 7x14 Page 3 of 6 product user guide mialble y Hines a m Standard Pinned Strut Dragbox System oe August 2012 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 leng
8. product user guide Ne 7m Standard Pinned Strut Dragbox System oa August 2012 Contents Page 1 Introduction Design Identification of Components Page 2 Identification of Components Cont d Dimensions and Connection Details Page 3 Sizes and Quantities of Struts Required to make up particular sizes of Dragbox Page 4 Off loading Site Handling and Assembly of Standard Dragbox General Guidance Notes Page 5 Use of Standard Dragbox Page 6 Summary Do s and Don ts References General 1 Introduction This booklet is intended to provide basic information for users of the Mabey 7m 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 bearing soils or in
9. th 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 Mabey Hire will normally supply the 7m drag boxes completely pre assembled to the width required for immediate installation in the trench Clients need to allow for the upper box to be connected to the lower box on site NOTE Clients should not normally attempt to dismantle and assemble 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 7m Dragbox See pages 1 2 and 3 for weights 6 7 1 Off Loading Reloading Lorry Base and Extension Box Pre assembled in Depot Use 4 leg chain sling JCBP 037 connected to lifting points as shown 6 7 2 Standing Pre assembled er Boxes Upright Use 2 No lifting points provided Lift by upper panel only 6 7 4 Connection of Upper box When it is required to increase the support height to bet
10. ween 2 4m using 2 No boxes Use the 4 No lifting points Stand lower box upright in partly dug trench Lower upper box onto lower box and fit 2 No front conn plates at the front and 2 No rear conn straps at the rear 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 C ll u T lt product user guide QIEEEM gt Ne 7m Standard Pinned Strut Dragbox System oa August 2012 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 clips 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
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