A Jersey barrier, or Jersey wall, is a modular concrete or plastic barrier employed to separate lanes of traffic. It is designed to minimize vehicle damage in cases of incidental contact while still preventing the crossover case of a head-on collision.
Also question is, what are barriers used for?
A safety barrier is a component which prevents passage into a dangerous area, commonly used to mitigate risk. Safety barriers may be hard barriers physically restricting passage or soft barriers that control circuits based on the presence of foreign bodies.
What is a median in the road?
The median strip or central reservation is the reserved area that separates opposing lanes of traffic on divided roadways, such as divided highways, dual carriageways, freeways, and motorways. The term also applies to divided roadways other than highways, such as some major streets in urban or suburban areas.
What is a median or a barrier?
Median barriers physically separate opposing traffic streams and help stop vehicles travelling into opposing traffic lanes. They are often built on the centre of wide urban multi-lane roads where they can be used to stop pedestrians crossing the road at unsafe places.
What is the length of a Jersey barrier?
concrete will have an air content of 5 ½ +/- 1% as measured by ASTM test method C 173 or C 231. minimum length of each barrier section will be 10 feet. It is common for DOTs to ask for lengths of 20 feet or even 30 feet.
What is the purpose of a Toeboard?
The purpose of a toe board is prevent objects, tools and equipment being falling over the edge or being knocked from the scaffolding structure. Its best practice to implement toe boards whenever handrails are used whenever there’s a risk of tools or objects falling from the edge.
What is the function of the scaffold?
Scaffolding, also called scaffold or staging, is a temporary structure used to support a work crew and materials to aid in the construction, maintenance and repair of buildings, bridges and all other man made structures.
What is the purpose of a scaffold?
Scaffold, in building construction, temporary platform used to elevate and support workers and materials during the construction, repair, or cleaning of a structure or machine; it consists of one or more planks of convenient size and length, with various methods of support, depending on the form and use.
How many types of scaffold do we have?
There are 4 types of scaffolding commonly used in construction works. Each of them are briefly described below. If elevation is required, then this is the most commonly used scaffolding type. If the scaffolding needs to take a lot of weight, then extra support may be required with supported scaffolding.
What is a cantilever scaffolding?
Cantilever scaffolding is a separate scaffold constructed to angle out from a building. Using a cantilever style eliminates the requirement for poles and frame be erected in front of a structure, as such cantilever scaffolds are usually sited near balconies for access.
What is a Putlog in scaffolding?
Putlog Scaffolds. A putlog scaffold consists of a single row of standards, parallel to the face of the building and set as far away from it as is necessary to accommodate a platform of four or five boards wide, with the inner edge of the platform as close to the wall as is practicable.
What is an outrigger on a scaffold used for?
Outrigger scaffold: A supported scaffold consisting of a platform resting on outrigger beams (thrustouts) projecting beyond the wall or face of the building or structure, the inboard ends of which are secured inside the building or structure.
What is a bird cage scaffold?
A birdcage scaffold is an independent scaffold consisting of more than two rows of standards in both directions connected by ledgers and transoms (see Figure 1). It is mainly used for work carried out on a single level, for example ceilings.
What is a suspended scaffold?
Suspended scaffolds are platforms suspended by ropes, or other non-rigid means, from an overhead structure. Because two-point scaffolds are the most common type of suspended scaffold, this eTool uses the Two-Point module to describe requirements that apply to all suspended scaffolds.
What is a dependent scaffold?
As the name implies, single pole scaffold is usually structured with just one pole or a small row of standards. It is a light-weight structure often dependent on the wall/building it is fixed to for support, and can most commonly be seen used for minor projects where only a few workers are needed.
What is a supported scaffold?
Supported scaffolds consist of one or more platforms supported by outrigger beams, brackets, poles, legs, uprights, posts, frames, or similar rigid support. Requirements specific to the other scaffold types are described only in their respective modules.
What is a trestle scaffold?
trestle. noun. a framework in the form of a horizontal member supported at each end by a pair of splayed legs, used to carry scaffold boards, a table top, etc. a braced structural tower-like framework of timber, metal, or reinforced concrete that is used to support a bridge or ropeway.
What is a trestle on a train?
A trestle (sometimes tressel) is a rigid frame used as a support, historically a tripod used both as stools and to support tables at banquets. A trestle bridge is a bridge composed of a number of short spans supported by such frames. Timber trestles were used to get the railroad to its destination.
What is a trestle platform?
The work at height regulations define a working platform as any platform used as a place of work or as a means of access to or egress from a place of work, including any scaffold, suspended scaffold, cradle, mobile platform, trestle, gangway, gantry and stairway that is so used.
What is a work platform?
An aerial work platform (AWP), also known as an aerial device, elevating work platform (EWP), or mobile elevating work platform (MEWP) is a mechanical device used to provide temporary access for people or equipment to inaccessible areas, usually at height.
What are railway bridges called?
While both railroad and road bridges can be considered a viaduct, only a rail bridge can be called a trestle. Steel trestles consist of a series of short and long plate girders that alternate over a row of box-shaped towers that taper outward from the deck to the ground.
What is a trestle desk?
The antique trestle desk is usually very much like the writing table desk form, which offers a simple flat desktop surface with a few drawers underneath it. Some antique trestle desks are fitted with small cubbyholes and nooks or small drawers at the extremity of the work surface, and thus resemble a bureau à gradin.