MGF TECHNICAL FILE MANHOLE BRACE. Description. Product Notes.

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1 Description Simple to assemble, four sided, hydraulic bracing frame system designed to be used with steel trench sheets or sheet piles to brace small cofferdams for the safe installation of manholes, pits and tanks. The range comprises seven sizes of hydraulic bracing frame legs ranging in length from 1.4m to 6.0m and is normally installed using either excavators or cranes. Fabricated from grade S355 SHS steel box sections the legs are assembled to form a frame using simple corner pin and retaining clip assemblies. Each leg contains a hydraulic ram with between 6mm and mm of stroke. Connecting the rams (via hydraulic hoses) to an MGF hydraulic pump unit containing hydraulic shoring fluid allows the leg lengths to be quickly and easily adjusted to suit the excavation dimensions. Once the frames are fully assembled and located at the correct line and level, the rams are pre-loaded against the trench sheets using a hydraulic pump. Pre-loading of the legs ensures the frame cannot slip and minimises the extent of potential ground movements. Self sealing quick release valves and mechanical isolation valves ensure that the hydraulic ram pressure cannot be accidently released once installed. Handling and restraining points are provided on each leg to assist assembly / removal and to allow the brace to be supported off MGF restraining chains attached to the trench sheets by hooks. MGF TECHNICAL FILE MGF can supply the systems with a full range of suitable handling and restraining chains, Edgesafe edge protection panels, Laddersafe access platforms and GRP or wooden pole ladders, Davitsafe retrieval / fall arrest systems, hydraulic pump installation kits (including bio-degradable shoring fluid and hydraulic hoses) and confined spaces regime equipment. Manufactured and designed in accordance with BS EN 14653:05 PARTS 1 and 2 Manually operated Shoring Systems for Groundwork Support and BS 5975 (08) Code of Practice for Temporary Works Procedures and the Permissible Stress Design of Falsework. Product Notes 1. Manhole brace should only be installed and removed by competent persons in accordance with a site specific detailed design & installation sequence and MGF installation guidelines. 2. Installation is normally carried out by lowering either the assembled frame or individual legs (dependant upon lifting capacity of excavator / crane) to the correct installation level and once the frame is fully assembled, preloading each leg in turn to ensure that the frame is pressed firmly against the trench sheets and cannot slip. Max pre-load pressure of 0Bar (00psi) must not be exceeded. 3. Restraining chains are hung off the trench sheets and attached to the legs to assist assembly / removal of the frame and ensure vertical support is provided at all times. All the supplied restraining chains should be installed (min. 2 per leg) and adjusted to ensure an even vertical load distribution. Restraining chains should never be used for lifting nor solely relied upon to suspend loads above personnel. 4. Ensure all hydraulic ram isolation valves are closed and all corner pins in place and secured using the retaining clips provided prior to commencing works. 5. Individual brace legs should be visually inspected for damage, excessive deflection or loss of ram pressure prior to entering the excavation. 6. Legs should always be installed square and plumb to the excavation walls ensuring contact with all the inward facing trench sheet pans. If this is not possible any gaps must be securely packed by using hardwood wedges prior to final pre-loading of the hydraulic rams. 7. Safe access/egress, edge protection (for personnel) and barrier protection (for plant) should always be considered. 8. Prior to removal of systems all hydraulic rams must be released and retracted to avoid the need for excessive extraction forces and to avoid damaging corner joints. 9. No matter how much care is taken during the installation and removal of hydraulic bracing systems some ground movement will occur in the areas immediately surrounding the excavation. Great care must be taken when specifying these systems for use adjacent to existing structures and services. design@mgf.ltd.uk 3.1.1

2 MGF TECHNICAL FILE MGF Laddersafe - See Section 6 MGF Davitsafe (A) - See Section 6 MGF Edgesafe - See Section 6 MGF Manhole Brace MGF Trench Sheets - See Section 5 For Safe System of Works Guidance for MGF Manhole Braces please see the MGF website & YouTube channel. youtube.com/mgfltd mgf.ltd.uk Tel

3 Handling Point WLL 2.0t All Manhole Brace legs and frames are lifted and handled by attaching MGF lifting chains to the handling/ restraining points as shown. Standard Duty Restraining Chain Connection Detail - WLL 2.0t There are 2 types of chains used, the top frame will use shackle to hook type, while lower frames will use shackle to shackle type. Individual chain links are selected to ensure all restraining chains are evenly loaded. MGF TECHNICAL FILE Leg Connection Detail Manhole Brace legs are connected to each other using a pin and R-clip detail design@mgf.ltd.uk Standard Duty Chain to Sheet Connection Detail The hook fits over the sheet

4 MGF TECHNICAL FILE With the use of Manhole Brace adaptors in the corners, different Manhole Brace legs can be connected to each other. Legs must be installed at 90 to each other Tel

5 Manhole Brace legs comprise inner and outer sleeved steel box sections housing either single acting (SA) or double acting (DA) hydraulic rams to provide up to 00mm of leg adjustment. MGF TECHNICAL FILE Product Description MGF 1 Series Manhole Brace (A) MGF 1 Series Manhole Brace (B) MGF 0 Series Manhole Brace (AB-) MGF 0 Series Manhole Brace (AB) MGF 0 Series Manhole Brace 00- (BC) MGF 0 Series Manhole Brace (CD) MGF 0 Series Manhole Brace (D) Product ID Sheet to Sheet Dimension (m) Min. Max. Series Compatible with* Hydraulic Ram SWL Leg Weight (kg) SA 80kN SA 70kN DA 1kN DA 1kN 0 SA 7.45 DA 7.4 SA 7.55 DA 7.5 SA 7.65 DA / / /0 SA 70kN DA 0kN SA 70kN DA 0kN SA 70kN DA 0kN * refer to page 3.1. for adaptor details design@mgf.ltd.uk 3.1.5

6 MGF TECHNICAL FILE Double Acting Hydraulic Cylinder Connections Shoring fluid is pumped into the full bore side of the piston through the male quick release valve (QRV) to extend the ram. At the same time fluid from the return side of the piston is returned to the pump via the female QRV. Retraction is a reverse of extension. Ensure isolation valve is closed to maintain pre-load pressure and before release/connection of QRV s. Single Acting Hydraulic Cylinder Connections Shoring fluid is pumped into the full bore side of the piston through the male QRV. Single acting cylinders cannot be retracted using a pump unit and have to be physically closed whilst releasing the male QRV. Ensure isolation valve is closed to maintain pre-load pressure and before release/connection of QRV s. Pump Units The pumps are used to extend and retract the Manhole Brace single acting and double acting hydraulic rams (SA and DA). The pumps contain bio-degradable Houghto Safe SF shoring fluid. During the Summer months the shoring fluid is diluted with water at a ratio of 3 parts water to 1 part Houghto Safe SF. In the Winter the mix ratio is 1:1. Maximum recommended installation pressure 00 psi (0 Bar). There are 3 types of pumps available, manually operated single acting and double acting bucket pump and a motorised petrol pump (suitable for use with double acting hydraulic rams only) Bucket Pump Petrol Motorised Pump Product ID (SA), (DA) 8.07 Fluid Capacity (L) 70 Shoring Fluid Houghto Safe SF Houghto Safe SF Working Pressure (psi) Tel

7 1 Series Manhole Braces Single acting 1700 to 3600mm legs Compatible with 0 Series Manhole Brace MGF TECHNICAL FILE Leg Assembly Inner Section Outer Section Specification 0x0x SHS 1x1x8 SHS Material Grade S355 S355 Unit Mass 27.4kg/m 27.6kg/m Axial SWL 80kN 80kN Moment SWL 24kNm knm Hydraulic Cylinder Material Single Acting Aluminium Bore 50.8mm Max.Working Pressure 0 Bar (5800 psi) [1] / 350 Bar (5000 psi) [2] Test Pressure 0 Bar (5800 psi) [1] / 350 Bar (5000 psi) [2] Approx. Working Stroke 800mm [1] / 10mm [2] Axial SWL 80kN [1] / 70kN [2] Min. FOS (by test) 2 Working Temp Range Approx. Pre-Load Approx. Pre-Load Pressure Locating Pins -ºC* to +50ºC kn 0 Bar (00 psi) Φ18 and Φmm * Winter mix required for shoring fluid at low temps. [1] 1 Series Manhole Brace [2] 1 Series Manhole Brace / 0 Series Manhole Brace Pin Pin Material Grade Shear SWL Weight Φmm bar, 0mm long 080M (EN8) 1kN 1kg design@mgf.ltd.uk 3.1.7

8 MGF TECHNICAL FILE Safe Working Load for MGF 1 Series Manhole Brace (A) Maximum Predicted Deflection (mm) Safe Working Load for MGF 1 Series Manhole Brace (B) Maximum m Predicted Deflection (mm) Tel

9 0 Series Manhole Braces Double acting 10 to 30mm legs Compatible with 0 Series Manhole Brace MGF TECHNICAL FILE Leg Assembly Inner Section Outer Section Specification 1x1x SHS (+ 2 No. 80x6mm thk. 0x0x8 SHS stiffening plates) Material Grade S355 S355 Unit Mass 44kg/m 35.1kg/m Axial SWL 1kN 1kN Moment SWL 50kNm 50kNm Hydraulic Cylinder Double Acting Material Steel Bore 63mm Max. Working Pressure 0 Bar (5800 psi) Test Pressure 0 Bar (5800 psi) Approx. Working Stroke 6mm [1] / mm [2] Axial SWL 1kN Min. FOS (by test) 2 Working Temp Range -ºC* to +50ºC Approx. Pre-Load kn Approx. Pre-Load Pressure 0 Bar (00 psi) Locating Pins Φ18 and Φmm * Winter mix required for shoring fluid at low temps. [1] 0 Series Manhole Brace [2] 0 Series Manhole Brace / 0 Series Manhole Brace Pin Pin Material Grade Shear SWL Weight Φmm bar, 0mm long 080M (EN8) 1kN 1kg design@mgf.ltd.uk 3.1.9

10 MGF TECHNICAL FILE Safe Working Load for MGF 0 Series Manhole Brace (AB-) Maximum m Predicted Deflection (mm) Safe Working Load for MGF 0 Series Manhole Brace (AB) Maximum Predicted Deflection (mm) Tel

11 0 Series Manhole Braces Single and Double acting 00 to 6000mm legs Compatible with 1 Series and 0 Series Manhole Brace MGF TECHNICAL FILE Leg Assembly Inner Section Outer Section Specification 180x180x SHS 0x0x8 SHS (+ 2 No. 0x12 thk. stiffening plates) [1] Material Grade S355 S355 Unit Mass 50.7kg/m 47.7kg/m / 66kg/m [1] Axial SWL 70kN SA / 0kN DA 70kN SA / 0kN DA Moment SWL 90kNm 90kNm / 180 knm [1] [1] corresponds to 0 Series Manhole Brace only Hydraulic Cylinder Single Acting Double Acting Material Aluminium Steel Bore 50.8mm 63mm Max. Working Pressure 350 Bar (5000 psi) 350 Bar (5000 psi) Test Pressure 350 Bar (5000 psi) 350 Bar (5000 psi) Working Stroke mm mm Axial SWL 70kN 0kN Min. FOS (by test) 2 2 Working Temp Range -ºC* to +50ºC -ºC* to +50ºC Approx. Pre-Load kn kn Approx. Pre-Load Pressure 0 Bar (00 psi) 0 Bar (00 psi) Locating Pins Φ18 and Φmm Φ18 and Φmm * Winter mix required for shoring fluid at low temps. 0 Series Manhole Brace Pin Pin Material Grade Shear SWL Weight Φmm bar, 265mm long 080M (EN8) 1kN 1kg design@mgf.ltd.uk

12 MGF TECHNICAL FILE Safe Working Load for MGF 0 Series Manhole Brace 00- DA (BC) Maximum m Predicted Deflection (mm) Safe Working Load for MGF 0 Series Manhole Brace 00- SA (BC) Maximum Predicted Deflection (mm) Tel

13 Safe Working Load for MGF 0 Series Manhole Brace DA (CD) Maximum m Predicted Deflection (mm) MGF TECHNICAL FILE Safe Working Load for MGF 0 Series Manhole Brace SA (CD) Maximum m Predicted Deflection (mm) design@mgf.ltd.uk

14 MGF TECHNICAL FILE Safe Working Load for MGF 0 Series Manhole Brace DA (D) Maximum m Predicted Deflection (mm) Safe Working Load for MGF 0 Series Manhole Brace SA (D) 35 Maximum Predicted Deflection (mm) Tel

15 Manhole Brace Adaptors 1-0 Series Manhole Brace Adaptors MGF TECHNICAL FILE The 1-0 Series Manhole Brace Adaptors allow 2 legs of 1 Series to be connected with 2 legs of 0 Series. The length of the 1 Series leg will increase by 8mm and the 0 Series will increase by 9mm. 0-0 Series Manhole Brace Adaptors The 0-0 Series Manhole Brace Adaptors allow 2 legs of 0 Series to be connected with 2 legs of 0 Series. The length of the 0 Series leg will increase by 185mm and the 0 Series will increase by 149mm. design@mgf.ltd.uk 3.1.

16 MGF TECHNICAL FILE Manhole Brace installed back to back to form a trench. Manhole Brace used in conjunction with Walers Tel