Tied scaffolds

Figure 8.9 (a) Typical independent tied scaffold (b) fixed scaffold left in place to fit the gutters. 

There have been many examples of scaffold collapse causing serious injuries to workers and members of the public. Factors which may affect the stability of an independently tied scaffold include ... 

Grit-blasting and concrete repairs are to be carried out on the external fagade of a five-storey building. Access will be by an independent tied scaffold, which will take up the entire width of the adjoining pavement. 

A gable end wall of a three-storey building adjacent to a canal needs repointing. An independent tied scaffold will be used for access. The scaffold will obstruct the towpath and will restrict the width of the canal. 

Independent tied scaffolds, which are temporary structures independent of the structure to which access is required, but tied to it for stability. 

Can Mr Champion make a recommendation on the design requirements of independent tied scaffolds The majority of independent tied scaffolds that are erected in the UK are not engineer designed they are just erected by reasonably experienced scaffolders. Can Mr Champion recommend a storey height maximum above which it should be mandatory for multi-storey scaffolds to be designed by an engineer ... 

The effect of direct radiation windows on overall thermal performance is great. This effect was minimized by quilting the adjacent blankets to close the glass gaps. To further secure the blankets together, glass-cloth tapes were tied circumferentially and longitudinally around the entire inner vessel. The scaffold boards were then removed from the annular space and the dollar plate welded back in place after installation of the blankets was completed. 

Mention must be made of bamboo. Its use for poles, pipes for water, tablets, fibers, and other things is widespread, and it dates back to ancient times. The bamboo is perhaps the only plant that is called in the same all over the world. In Java, Indonesia, in 1910, a bridge of bamboo was made over the Serayu River, and today, the scaffolds for building construction in the far East are still made of bamboo, of course not nailed but tied in order to allow for dimensional changes. 

Slipped on scaffold board which was bridging a pool of muddy water Tripped on tying wire Fell approx. 2.5 m from untied ladder Stumbled while walking along a trench invert Slipped on walkway and struck hand against handrail Trapped between projecting H-pile and slewing crane. 

Two-directional synthesis can be used in a folding pathway approach, so that a symmetrical substrate can be used as a molecular rope that is tied into knots to get efficient formation of a range of linear and polycyclic architectures with NP-Hke features. This nice piece of work was reported by Stockman et al. [22], who used diethyl-7-oxotrideca-2,ll-dienedioate 134 as the common substrate to yield 12 scaffolds (Scheme 13.20). Although simple reactions such as the Grignard reaction yielding the corresponding tertiary alcohol 135 did not... 

Scaffolds properly tied to buildings or odier appropriate structure. 1 2 3 4 N/A... 

Two-point and multi-point suspension scaffolds shall be tied or otherwise secured to prevent them from swaying, as determined to be necessary based on an evaluation by a competent person. Window cleaners anchors shall not be used for this purpose. 

Transverse bracing forming an X across the width of the scaffold shall be installed at the scaffold ends and at least at every third set of posts horizontally (measured from only one end) and every fourth runner vertically. Bracing shall extend diagonally from the inner or outer posts or runners upward to the next outer or inner posts or runners. Building ties shall be installed at the bearer levels between the transverse bracing and shall conform to the requirements of 1926.451 (c)(1). 

Ropes shall be attached to the needle beams by a scaffold hitch or an eye splice. The loose end of the rope shall be tied by a bowline knot or by a round turn and a half hitch. 

This Appendix provides drawings of particular types of scaffolds and scaffold components, and graphic illustrations of bracing patterns and tie spacing patterns. 

Whether an employer is permitted to double wrap 9 gage steel wire in order to guy, tie, or brace a scaffold — 1926.451 — March 26, 2010... 

Although section 1926.451(c) requires employers to guy, tie, or brace certain scaffolds, it does not specify whether 9 gage steel wire is a permissible method of compliance. However, 29 CFR 1926.451 (a)(1), which provides (1) Except as provided in paragraphs (a)(2), (a)(3), (a)(4), (a)(5) and (g) of this section, each scaffold and scaffold component shall be capable of supporting, without failure, its own weight and at least 4 times the maximum intended load applied or transmitted to it. ... 

OSHA does permit an employer to guy, tie or brace certain scaffolds using 9 gage steel wire, provided the following five conditions are met in order to comply with 29 CFR 1926.451(a)(1) ... 

Independent tied - these are scaffolding structures which are independent of the building but tied to it often using a window or window recess. This is the most common form of scaffolding and... 

Transom a tube spanning across ledgers to tie a scaffold transversely. It may also support a working platform. 

Ladders securely tied should be situated as close as possible to the working area on the roof and extend 1 m above the roof level. Where the height to the roof exceeds 9 m, it is normally a requirement that a scaffold tower with ladders be provided such that the height between intermediate platforms does not exceed 9 m. 

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