Weighbridge

The SAMURAI CC pour-on-site concrete weighbridge is ideal for a wide range of applications, providing a robust, maintenance free, weighing deck. The weight of the steel deck framework used to retain the ready mixed concrete is less than the equivalent full steel weighbridge and therefore the Samurai CC structure is relatively easy to man oeuvre into position, without the need for heavy duty cranes.

This steel frame (complete with reinforcing) is installed on site with dummy load cells and then in-filled with ready-mixed concrete. When this has cured, the stainless steel fully weld-sealed digital or analogue load cells are fitted in place of the dummies and the system calibrated. Such ‘pour on site’ installations reduce the overall transportation carbon footprint and on site craneage requirements. The non-slip finish provides an excellent skid resistant surface.

This design of weighbridge is ideal for indoor installations where access is restricted for cranes. The Samurai CC can be supplied in custom sizes (imperial and metric) to be fitted into existing weighbridge pits.

In some extremely wet, frosty and potentially corrosive environments, a concrete structure may provide a durable solution with greater traction. Concrete structures require higher installation time and efforts as concrete needs time to pour, level, dry out and cure before use. For durability, concrete structures need to be adequately reinforced by high strength steel construction since concrete is extremely strong in compression (top of structure) but is known to be weaker in tension (bottom of structure). Ramps: In the case of surface mounted weighbridges, approach ramps are required which can be of concrete or steel structure. Remember that ramps take the brute force of being hit by a vehicle as it mounts the ramp. Concrete can offer longevity, while steel is ideal if the weighbridge is likely to be moved.

Junction Box (Analogue Digital Type)

FEATURES:

• Makes weigh scale installation fast and easy
• Powder coated MS sheet enclosure sealed against moisture and dust
• Compression cable glands for load cell cables and output cable to indicator
• Signal trimming by trim pots for every load cell (corner error correction)
• Section trimming by trim pots for every section
• Protection against high voltage induced by spikes, surges and lighting

APPLICATION:

• Weighbridge
• Multi load cell scales

TECHNICAL SPECIFICATIONS

• Load Cell connectivity : 4 (JB04), 6 (JB06) or 8 (JB08)
• Corner Adjustment : Through multi turn potentiometers for individual load cells
• Section Load : Through multi turn potentiometers (one for each section) trimming
• Electrical Protection : Gas discharge tubes, SVP diodes and varistors for protection against transients induced
• by line voltage spikes, surges and lightning
• Environmental Protection: Rubber Seal Gasket on top cover and air tight cable glands for entry of load cell cables
• and indicator cables
• Dimensions : 230 mm (W) X 190 mm (D) X 55 mm (H)
• Weight : 2.0 kg

Pit mounted weighbridges are flush with the ground. As a result they pose no restrictions to vehicular Movement and are therefore particularly useful at sites where vehicle flow can be in multiple directions. Most mechanical weighbridges were installed in pits to accommodate the lever assemblies so when they are upgraded or replaced, new bespoke size pit mounted steel weighbridge decks and load cells provide a very cost effective answer. Samurai have developed special mounting assemblies to facilitate the use of existing pits, ensuring the new decks sit level with the surface. This approach removes the need for costly and disruptive foundation changes.

Pit or surface mounted weighbridges

Having arrived at a suitable size and capacity configuration, the next big decision is whether to go for a pit or surface mounted bridge. Let us understand these variants. Pit mounted weighbridge: These weighbridges are installed in a pit, keeping them flush to the road surface. Because these bridges do not require ramps, they take up less surface area, making them ideal for smaller areas or sites where space is at a premium. Initial civil and foundation work can make pit installations a more expensive option. A pit is also prone to piling of debris and water logging, requiring provision of sump-pumps and manholes for maintenance purposes. Guide-rails are not required for pit mounted bridges

Weighbridge Manufacturers

The varying concentration of lateral steel beams along the length of the weighbridge deck takes into account high loading areas and the over-sized longitudinal beams are specified for minimum deflection along the standard 18 metre length. A range of bespoke capacities, lengths and widths is available to order.

It is also suitable for short term portable applications where the use of special load cell mount assemblies and steel ramps provide a low profile solution for temporary installations.

These robust weighbridges can be fitted with analogue or digital fully welded stainless steel canister load cells and mounting assemblies, The load cell assembly is designed to optimise load introduction and prevent load cell damage, even under heavy braking conditions. The compact format of the analogue or digital provides a number of important technical advantages over other weighbridge load cell designs, especially more cumbersome beam cells and weighing bars.

Other common weighbridge lengths are 7.5m, 12m and 18m. Though most of the vehicles on Indian roads fit in 3m platform widths, in some cases a 3.5m width is required for ease of manoeuvrability.

Specification:

Weighbridge For Trucks

Pit less weighbridges offer straightforward installation procedures and the side frames help to guide Vehicles centrally through the bridge. Approach and departure ramps can either be of steel construction or pre-cast in concrete on-site. Removable steel ramps have the advantage of being able to be moved with the bridge if relocation is required, leaving the site level. Samurai offer two main designs of steel Weighbridge.

The modular weighbridge, which can be used in both surface and pit installations, provides a low profile solution for weighing normal size vehicles and is available up to 18 meters in length. The Pitiless design (opposite) is ideal for weighing higher capacity vehicles, especially those that operate off road. The single steel structure has two main longitudinal beams and a varying concentration of cross beams to provide optimum strength at critical load points along the length.

A weighbridge with steel fabricated structure is faster, easier and in most cases more cost effective to install. With a blast-cleaned surface and good quality painting, the steel structures can provide a hard wearing finish against corrosion and hence a longer life. These are also easier to relocate, if required. In terms of maintaining product quality, steel structures should be fabricated under controlled factory conditions and can be shop-inspected prior to dispatch. When purchasing a weighbridge with a steel structure, ensure that you check that the deck is well designed and fabricated in a supplier’s own controlled facility using prime quality steel sourced from reputed steel makers.

Specification:

About

In basic terms, the load cell is the part of any scale that measures the weight or forced being applied. The cells convert the force of the load into an electrical signal, which is then read and displayed by a weight indictor. Load cells come in a range of different sizes, shapes, capacities and performance parameters. However, in the context of truck weighbridges, the basic distinction is analogue and ‘digital’ load cells. Generally speaking, both analogue and digital cells use the same strain-gauge technology – but differ in terms of output of the load cell and therefore offer different benefits depending on the usage.

Shear-beam type: Available as single or double ended shear beam (the latter being more common in weigh­bridges), this type of load cell can offer slightly lower profile and less sensitivity to side-loads, but often with poorer sealing (potted) and corrosion resistance (alloy steel). These load cells are more advantageous in silo/ vessel weighing where rigid connections and head-room constraints are an issue as compared to a vehicle weigh­bridge where sealing and protection are very important.

Load cell accuracy: Keep in mind that accuracy of a load cell has no relation to it being analogue or digital, compression or shear-beam type. All of these can offer an accurate and dependable solution, provided the load cell fulfils the accuracy criteria as set by the relevant certifying bodies (e.g. OIML R60 for India). Insist on approval certificates rather than conformance assertions.