Spiral Stairs Commercial Exterior Custom Spiral Staircases Suppliers UK

LOAD TESTS IN ACCORDANCE WITH BRITISH STANDARD CODE OF PRACTICE 3-CHAPTERS 5 AND B.S.C.P. 110

Two of our company's standard systems have been load tested by Harry Stanger Laboratories Ltd., illustrations of which are shown below.

TEST 1: In accordance with C.P.3 Chapter 5 carried out on a 1.0 metre radius stairway. Loads of 183 Kgs (405lbs) positioned on the centre line of tread and 150mm. From the cantilevered end of each tread. Readings were taken from micrometer dial gauge at intervals throughout 24 hours and on removal of loads. Tests proved compliance with Code of Practice Chapter 5 with an average recovery of 91%. Further load tests on a single tread of twice the recommended weight has again proved satisfactory, with cracking appearing with ta test load in excess of 0.6 Tonne.

TEST 2: In accordance with C.P. 110, Part 1, 1972, carried out on a 1,050 metre radius closed pattern stairway. Design imposed loads were factored by 1.25 to give a test load of 3.75 Kn/m2 (603lbs). The intensity of loading was applied incrementally to the treads and landings, and readings taken throughout 24 hours. Appropriate total weight on double lift stairway was just under 10 tonnes. The recovery of the stairway showed compliance with C.P.110 with a maximum deflection of 0.94mm. to the outer edge of the landing, and a maximum tread deflection of 0.69mm.

OTHER COMPANY PRODUCTS:

As well as the full range of spiral staircases we manufacture a special circular paving slab system, balustrades and Doric columns, and are specialists in pre-cast architectural design and sculpture.

Method Statement (Installation)

General Instructions for Spiral Stairway Installation

1.	Check floor to floor height with dimension given on drawing.
2..	Should there be a small dimensional difference of say les than 25mm. Make this adjustment on every rise.
3.	4 times drill prepared concrete base and fix base plate/pole in correct vertical position in relation to landing/landing anchor.
4.	Main Contractor to concrete or make provision to support first tread at finished floor level.
5.	Place first tread into position, concrete between inside of tread and outside face of steel tube and check that the first tread is correctly sited. Place mortar bed on tread boss and place second tread into position giving the required going and overlap.
6.	Support each individual tread with timber props supplied by main contractor. Do not remove props until final fixing of contract.
7.	All mortar joints to be flush or tapered according to boss detail.
8.	Continue sequence up to first jointed pole where a recessed tread is used.
9.	Screw on coupling socket with stilson wrench and fit next pole length.
10.	Continue installing the treads up to landing/landing anchor level.
11.	Place final steel pole for newell in position with socket coupling and cement newwll in place.
12.	Before newell cap is mortared into position, make sure the steel core is completely filled from top to bottom with liquid grout.
13.	Make good any joints and defects in concrete.

Consculpt Spiral Stairs Ltd.
Ash Close
Par
Cornwall PL24 2HD

tel/fax: 01726 816555
Email: info@spiralstairs.uk.com

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