Cast-in-place anchor bolts are the simplest – and strongest – type, with an embedded end consisting of a normal hexagonal head bolt and washer, 90-bend, or some sort of forged or welded flange. The latter are utilized as shear connections in concrete-steel composite structures. Anchoring machinery to poured concrete floors and buildings to their concrete foundations are examples of such applications. To attach and align cast-in-place anchors prior to concrete placement, a variety of largely temporary aids, mostly made of plastic, are developed. Furthermore, their placement must be coordinated with the reinforcing plan. There are several types of cast-in-place anchors to choose from:
- Lifting inserts are used to lift RC beams that are either plain or pre-stressed. A threaded rod can be used as the insert.
- Anchor channels are utilized in the construction of precast concrete connections. The channel can be made of hot-rolled or cold-formed steel, and the load is transferred to the base material using a T-shape screw.
- A steel plate with headed studs welded on is known as a headed stud.
- Threaded sleeves are made out of a tube that has an internal thread that is anchored into the concrete.
The mechanical interlock, i.e. the embedded component of the anchors in concrete transfers and the applied load (axial or shear) via bearing pressure at the contact zone, is the load-transfer mechanism for all types of cast-in-place anchors. If a pure tension force is transferred at failure conditions, the level of bearing pressure can be higher than 10 times the concrete compressive strength. In masonry applications, cast-in-place anchors are used in wet mortar joints during the laying of bricks and cast blocks (CMUs).
Double End Stud Details:
On a threaded end of the Double End Stud that is to be encased in concrete, an anchor plate is normally secured between two hex nuts. This is either done by the maker of the Double End Studs or by the steel fabricator who purchases the rods.
The Double End Stud, often known as the “Anchor Rod,” is held in place in the field by a template. Before the concrete is poured, this template is utilized to hold the Double End Stud in place. It aids in the right positioning of the Stud in relation to the depth of the foundation, the necessary thread projection from the concrete, and the closeness of adjacent bolts.
The concrete is poured once the bolts have been installed. The threaded end of the stud will protrude from the concrete surface in some places. After the concrete has hardened, a constructed steel structure can be connected to the threads on the Double End Stud’s projecting end.
As the structure is loaded and the Double End Stud is dragged away from the concrete, the anchor plate’s role becomes to hold the structure together by resisting the cured concrete above it.
Larger constructions and applications requiring more complex engineering are the most prevalent uses for Double End studs.
Bent Anchor Bolts:
PSI sells a wide range of normal 90 degree anchor bolt diameters, ranging from 1/2″ to 1-1/2″, and lengths ranging from 6″ to 36″, but we specialize in bent anchor bolts made to your specifications. We can make custom anchor bolts in diameters ranging from 1/2″ to 2″ in grades 36, 50, 55, and 105. PSI can satisfy your exact requirements whether you need plain, zinc, hot dipped galvanized, 304, or 316 stainless steel.
As a wholesale anchor bolt supplier, we offer fully traceable goods that fulfill ASTM, SAE, ASME, Military and Federal Standards, ISO, AASHTO, and special specifications.
Heavy Duty Screw Anchor Details:
ACI 355.2, AC193, and AC106 standards were followed during testing. Static and seismic loading conditions qualified
Thread design incorporates undercuts for optimum load transfer to the underlying material. Fractional sizes that are standard.
A specialized heat-treating procedure hardens the tip for enhanced cutting while maintaining ductility. There’s no need for a unique drill bit because it’s meant to be installed using standard-sized ANSI tolerance drill bits. Unless needed by regulation, a hex-washer head eliminates the need for a separate washer and provides a neat installation. Removable perfect for temporary anchoring (e.g., formwork, bracing) or situations where fixtures may need to be relocated. It is not suggested to reuse the anchor because it will not attain the indicated loads.
- Zinc plated or mechanically galvanized
- Not recommended for permanent exterior use or highly corrosive environments
- Drill a hole in the base material using a carbide drill bit the same diameter as the nominal diameter of the anchor to be installed. Drill the hole to the specified embedment depth plus minimum hole depth overdrill (see table below) to allow the thread tapping dust to settle, and blow it clean using compressed air. (Overhead installations need not be blown clean.) Alternatively, drill the hole deep enough to accommodate embedment depth and the dust from drilling and tapping.
- Insert the anchor through the fixture and into the hole.
- Tighten the anchor into the base material until the hex-washer head contacts the fixture.