Housing Project Supply for Blocks in Syria: Sizes, Volume and Delivery Rhythm

Housing project supply for blocks in Syria is settled months before the first pallet leaves the yard, and the deciding document is not the machine datasheet. It is the contractor's pour schedule together with the structural drawings that name the block. Those two papers fix the mould, the pallet, the pieces per cycle and the number of pallets the yard must hold. A plant that quotes by the thousand blocks and plans by the truck meets the mismatch in week three, with a full curing yard and a pour waiting.

Which block size does a housing project fix, and who decides it?

The project decides, not the machine. A housing contract carries a wall schedule: 390 x 190 x 190 mm hollow block for the load-bearing and infill walls, 240 x 115 x 51 mm standard brick where partitions and lintels are detailed, and a strength class written against each item. The machine reproduces only what the mould contains, so the mould is ordered to the drawing. Its parts, the frame, core, base plate, guiding assembly and positioning mechanism, are machined and hardened as one set.

That single decision propagates further than most buyers expect. On a QST6-15 the same 980 x 680 x 20 mm pallet carries 6 hollow blocks of 390 x 190 x 190 mm per mould, or 32 to 36 standard bricks of 240 x 115 x 51 mm. The dry cycle stays between 15 and 23 s either way. Pieces per pallet move by a factor of five, so pallets per square metre of wall move with them while the cycle does not.

How many pallets a day must the plant produce to keep a pour moving?

Work in pallets from the first estimate. Take the wall area of one floor, convert it to blocks at the specified size, divide by the pieces on a pallet, and you have the pallets one pour consumes. That number, not the block count, is what the curing yard, the cuber and the truck see. On a QS-1200A the ceiling is about 3,800 pallets per shift, roughly 475 pallets in an hour of an 8 h shift, with each layer stacked in 15 to 18 s.

Compare the pour figure with that ceiling before you buy anything. If the week's pours fit inside 3,800 pallets, one shift covers them and leaves room for a rejected batch. If they do not, the plant runs a second shift or the contractor accepts two pours a week. A larger host machine does not clear a pallet bottleneck, because the cuber, the yard and the clamp set that limit.

How much volume belongs in one delivery batch?

A batch is the quantity one truck can deliver and the contractor can unload, stack and cover before the next pour. Fix it on site with the site engineer, in pallets and in blocks. The clamp decides the loading pattern: 500 to 800 standard bricks or 40 hollow blocks per bite, 10 standard layers or 5 hollow layers, within a 2,000 kg load and an arm opening of 680 to 1,150 mm. Loading is pallet-free, so the pallets stay in your yard and the truck carries product only.

Two consequences follow. Your pallet fleet does not shrink with every delivery, which is why one yard serves a long contract on one set of pallets. And the batch carries a handling time, counted in clamp bites, that the contractor's foreman notices at the gate. Agree two or three batches a week with named days, and write the block size beside each day, because a batch arriving in the wrong size is a rejected batch.

How much cured stock must the yard hold for a week of pours?

The yard is laid out around pallet count, never block count: pallet footprint plus aisle, repeated for every pallet in cure. The stack height limit belongs to the cuber you choose, 1,400 mm on the QS-1200A, which is seven courses of a 190 mm hollow block and far more of a 51 mm brick. That cuber stands on 12,000 x 3,000 mm, weighs 18,000 kg and draws 34.15 kW, so its position fixes the yard layout as firmly as the pallet does.

For a week of cured stock, multiply the pallets one pour consumes by the number of pours in the week, then add the pallets still in cure from the previous week. Measure the days your mix needs before a block can enter a stack; that figure comes from your own trial stacks, not from a catalogue. If the site cannot hold the result, shorten the interval between batches instead of shortening cure. A block shipped green becomes a claim, and no delivery date is worth that.

What changes when the contractor changes block size mid-contract?

Four things change, and only the first is obvious. The mould changes, and with it the piece count per cycle. The pallet may change if the new size needs a different format, and a pallet change touches every conveyor, the cuber and the clamp setting. The curing plan changes, because the new block has its own height and its own limit under 1,400 mm. The clamp bite changes too: 40 hollow blocks per bite against 500 to 800 standard bricks, which moves truck loading time.

Plan the swap as a production event, not a parts order. A mould change stops the host machine, needs a first-off sample checked against the drawing, and leaves the yard holding stock of the old size that still has to ship. Write a notice period into the supply contract, and treat the change as a mould plus a lost shift plus a yard re-plan. Contractors change size for a reason, usually a drawing revision, so the notice protects both sides.

The order in which the numbers get fixed

Fix block size first, then batches per week, then pallets per batch, and only then machine capacity and yard area. Each step constrains the next, and running them backwards produces a plant sized for a catalogue page instead of a contract. A cuber rated at 3,800 pallets per shift is useful only when the pour schedule can absorb that many, and a mould cut to the wrong drawing is scrap steel with a delivery date.

The buyer who arrives with a wall schedule, a pour calendar and a site plan gets a machine that fits the contract. The buyer who arrives with a budget and a country name leaves the capacity decision to the seller, and that decision is rarely the right one. Bring the first three documents, and the capacity question answers itself in one meeting.