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The temporary pavilion that is erected every summer next to the Serpentine Gallery in London鈥檚 Kensington Gardens is an exercise in architecture as art. This year鈥檚 pavilion, which opens to the public tomorrow, is designed by Californian starchitect Frank Gehry, and it doesn鈥檛 take an art connoisseur to spot that it鈥檚 in the deconstructivist style. It鈥檚 a loose pile of hefty timber beams and columns, steel struts and glass panels, all thrown together at seemingly haphazard angles. In fact, the whole assembly looks 鈥� no doubt deliberately 鈥� as if it is in the act of collapse.

At the unveiling last week, Gehry made cryptic references to garden parties, timber structures and Leonardo da Vinci鈥檚 giant catapults as design influences, but this did little to explain the massive clunking structure of oversized beams and columns at chaotic angles. Another design influence 鈥� a flock of butterflies 鈥� is more evident, in the six glass canopies that float overhead at nonchalant, carefree angles.

For the construction team, headed by Taylor Woodrow, putting the pavilion together was anything but a haphazard operation. It relied on a precision-engineered computer model worked up by Arup. 鈥淣ot one of the steel connections was wrong,鈥� says Roy Page, Taylor Woodrow鈥檚 site manager. 鈥淚t all fitted together first time like a dream.鈥�

Taylor Woodrow was given just 12 weeks to plan, procure and erect the 395m2 pavilion. 鈥淥n a normal steelwork contract,鈥� says project manager Lewis Parker, 鈥� we鈥檇 have a lead time of 20 weeks, but on this it was six.鈥�

Not surprisingly, the site team has worked long hours 鈥� from 6am to 10pm in split shift, seven days a week 鈥� to meet the strict deadline. But as trainee construction manager, Rick Rigby, says: 鈥淚t鈥檚 not every day you work on a Frank Gehry project.鈥�

The pictures follow the progress of construction.

Week 8 (18 June)

1. Portal frame assembly

The four, 16m high primary columns were fabricated off-site out of structural steel and encased all round in hefty douglas fir planks. After delivery to site, the first two columns and a beam were bolted together into a portal frame on the ground

2. Portal frame erection

The first portal frame, weighing 35 tonnes, was lifted into position. Crane contractor Hewden used two large mobile cranes of 100 tonnes and 225 tonnes in tandem. The columns were bolted to the caps of piles that had been temporarily screwed 6m into the ground.

3. Structural frame assembly

After the second portal frame was erected, the two linking beams were lifted into position. These were bolted to the steel box knuckles, connecting the columns and beams.

Week 10 (2 July)

4. Canopy fabrication

The frames for nine trapezoidal roof canopies measuring up to 101m2 in area, were fabricated on site out of steel beams and timber rafters. The beams were encased in timber boarding. Toughened prefabricated glass panels were then fixed between the steel beams and rafters.

5. Roof canopy erection

The roof canopies were hoisted into position at what seemed to be haphazard locations and angles.

But these had been precisely predetermined by steel struts suspended from the hefty primary beams overhead. Winches on ropes attached to the corners of each canopy were used to adjust its precise angle before lifting them into their final positions.

6. Roof canopy fixing

Once each canopy was suspended at its precise location and angle, it was fixed into position by bolting cleats from its steel frame to the steel struts suspended from the primary beam overhead.

Week 12 (14 July)

7. Final fit-out

The pavilion was finished off by constructing two terraces of timber seating along either side of the central concourse and fixing glazed screens at the back. Beyond the terraces, two small viewing platforms were built with timber stairs leading up to them.