(Version with Polymer Concrete Lid is DISCONTINUED)
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Introduction
The Vanstone Three Piece Manhole is a kit-form light duty precast concrete service chamber / draw box suitable for underground telecoms services.
The kit consists of a base or floor, a wall section and a lid section with a choice of cast iron, lockable steel or reinforced concrete covers and frames. The walls are supplied with knock-out holes to the customers' requirement.
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View without lid (Version with Cast Iron F & L)
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Dimensions:
- Inside: 600 x 450 x 640mm deep
- External: 695 x 530 x 650mm high
- Wall thickness: 40mm
- Weight (total): 290kg
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Lid section, ±130kg
Wall section, ±100kg
Base section, ±46kg
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Service entry holes:
Any configuration. Rather specify more holes than fewer. Typical:
- Long sides: 7 x of 110mm diameter
- Short sides: 4 x of 110mm diameter
- Base: 1 x 40mm diameter drainage hole.
Click here for detail of holes |
Complete Manholes
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Manhole with Cast Iron Lid
Manhole complete with light duty cast iron cover and frame cast into concrete surround. Size (externally): 760 x 610 x 695mm high. Mass: 314kg Prod. no.: P2-1501 |
Developed for Vodacom South Africa and used on GSM base stations |
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Manhole with Lockable Galvanized Steel Lid
Manhole complete with lockable "vastrap" lid cast into concrete surround. Size (externally): 760 x 610 x 695mm high. Mass: 300kg Prod. no.: P2-1501/6 |
Developed for Cell C and Tricom South Africa and used on GSM base stations |
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Manhole with Reinforced Concrete Lid
Manhole complete with reinforced concrete lid cast into concrete surround. Size (externally): 760 x 610 x 695mm high. Mass: 359kg Prod. no.: P2-1501/8 |
Load Class: Lid tested to B125 12.5t For this loading a special frame would be required. |
Components
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Cast Iron Cover and Frame
Light duty cast iron cover and frame cast into concrete surround. Size (externally): 760 x 610 x 235mm high. Mass: 167kg Prod. no.: P2-1501/1 |
Developed for Vodacom South Africa and used on GSM base stations |
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Lockable Steel Cover and Frame
Steel hot dipped galvanised non-slip lockable cover. Secure slip-hinges and lock cleat cast into concrete surround. Size (externally): 760 x 610 x 240mm high. Mass: 154kg Prod. no.: P2-1501/5 |
Developed for Cell C and Tricom South Africa and used on GSM base stations |
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Lockable Steel Replacement Lid
Steel hot dipped galvanised non-slip lockable cover for replacement of stolen or damaged steel lids. Size (externally): 650 x 500mm. Mass: 14kg Prod. no.: P2-1501/7 |
Developed for Cell C and Tricom South Africa and used on GSM base stations |
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Concrete Cover and Frame
Anti-theft reinforced concrete / hot dipped galvanised compsite cover and frame Lid Section. Size (externally): 820 x 670 x 200mm high. Mass: Concrete Lid - 75kg, Concrete Frame - 137kg Prod. no.: P2-1501/9 |
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Wall Section
Precast concrete rectangular ring wall with either straight-through or knock-out holes in positions to Customers' requirements. Size (externally): 690 x 630 x 430mm high Mass: 100kg Prod. no.: P2-1501/2 |
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Base Section
Precast concrete base with locating shoulder and drainage hole. Size: 690 x 630 x 50mm thick Mass: 46kg Prod. no.: P2-1501/3 |
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Installation
The total external height of the manhole is 650mm. It is often preferred that the rim of the manhole project above the ground or paving by at least 75mm. This determines the depth of excavation. Excavate for the manhole and over-excavate for the sides sufficiently to allow for compaction equipment. Where sufficient accuracy of excavation can be achieved, only slight over excavation is required, which may be backfilled with a cement stabilized gravel or mass concrete if preferred.
Backfilling should always be at least as strong and serve the same purpose as the surrounding soil. To aid the drainage of occasional rain water, a subsoil drain may be installed under the manhole. This can be in the form of a small sump under the centre hole that can hold extra water or a system that drains water away from the manhole. Simply over-excavate to the size required and fill with any constant size crushed stone.
In the bottom of the excavation, prepare a true and level 50mm thick bed of riversand, crusher sand, fine clean gravel (particle size < 6mm) or cement stabilized topping material. Place the manhole base or floor carefully on the bed ensuring proper and even seating. Place the wall section on the base, ensuring that it is the right way up when looking at the service holes. Use a thin layer of cement mortar between the walls and the base if seating is not snug. Place the lid section on top of the walls and make sure that the walls penetrate into the recess at the bottom of the lid and is not half-in, half-out. The manhole can now be used to install sleeves, cables and other services. Full water tightness is not achievable.
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Knocking out of holes:
Use a light ball head or ball-pein hammer of no more than 1½ lbs. Identify the hole to be knocked out by looking on the inside. Put one hand over the hole. Now locate the hole's corresponding outside position by placing the other hand on the outside of the wall directly over it. Mark if necessary. Start tapping from the outside with the ball of the hammmer as close as possible to the centre of the hole. The taps should be light and repeatedly on the same spot until penetration occurs. Carefully enlarge the hole from the centre out until it is complete. NEVER use force, a heavy hammer or knock the from the inside out. |
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Specification
Click to download Generic Specification (286KB)