GB2250330A

GB2250330A - "Anchor for setting in concrete"

Info

Publication number: GB2250330A
Application number: GB9019183A
Authority: GB
Inventors: David Evans
Original assignee: TAG IND FASTENERS Ltd
Current assignee: TAG IND FASTENERS Ltd
Priority date: 1990-09-03
Filing date: 1990-09-03
Publication date: 1992-06-03
Anticipated expiration: 2010-09-03
Also published as: GB9019183D0; GB2250330B

Abstract

An anchor for setting in concrete, comprises a circular shaft 1 with a bar 5 extending transversely through the shaft 1 and a threaded bore 3 in or on the upper end 2 of the shaft 1 to secure other items thereto, in which the shaft 1 has peripheral grooves 7 in which the concrete sets. The anchor may be made of plated steel. Dimensions of the grooves are specified. <IMAGE>

Description

ANCHOR MEANS This invention relates to anchor means and particularly to an anchor which is adapted for setting in a settable material such as concrete or like material. The invention is particularly, but not exclusively, intended for use in the construction industry.

In civil engineering constructions such as bridges, or the framework of buildings, it is frequently necessary to secure another item or member to a concrete base. Examples are the metal framework of a building which must be secured to a concrete base or footings, or guide rails for a bridge or roadway which have to be secured to the road itself.

Known methods of securing such structures to concrete bases include, for example, expansion bolts which are inserted in a hole drilled in the concrete so that when the bolts are tightened an expansion device on the bolt expands laterally outwardly to grip the concrete to thereby secure the bolt in the hole. Another form of known anchor is a steel bar which has a smooth outside surface and is typically set in the concrete as the concrete is poured. The anchor will have either an internal or external thread through which the remaining parts of the structure are secured to the anchor.

It is known for such anchors to have a reinforcing rod extending laterally outwardly from the steel bar to provide additional anchorage in the concrete. Known forms of such anchors have a maximum load capacity of 22 1/2 tons.

The present invention seeks to provide an improved form of anchor with a much greater performance.

According to the present invention there is provided anchor means for setting in a settable material such as concrete or like material, the anchor means comprising a main shaft, preferably of circular cross-section, fastening means on said shaft to enable an item to be secured thereto, a reinforcing member extending from the periphery of the shaft, and one or more peripheral grooves in said shaft, which grooves are adapted to accomodate said settable material.

Preferably, the main shaft has a plurality of said peripheral grooves, preferably three, located at spaced intervals in the lower most part of the shaft, when set in concrete. Preferably, the reinforcing member comprises a steel bar extending radially through the main shaft adjacent the lower end thereof. Peripheral grooves may be located on the main shaft on each side ofsthe reinforcing member. At its upper end, the main shaft may have an internal threaded bore.

Alternatively, a thread may be provided on the exterior of the main shaft, both of these threaded elements being provided to enable a further item to be secured to the anchor by means of a bolt in the case of the internal threaded bore, or a nut secured to the external screw thread on the main shaft.

A preferred embodiment of the present invention will now be described by way of example, with reference to the accompanying informal drawings which illustrates, in figure 1, a side view of an anchor means, and figure 2 shows a section along the line AA of figure 1.

Referring now to the drawing there is shown an anchor for setting in concrete in civil engineering structures. One particular application for the anchor is in the provision of fastening means to enable a concrete side wall or retaining barrier to be secured to the edge of a roadway of a bridge or like structure where some form of lateral safety barrier is required. As shown in figure 1, the anchor has a main shaft 1 of circular cross-section formed of a high grade steel. The anchor is adapted to be set in concrete with the main shaft substantially vertically disposed, although this may be varied to suit the particular circumstances of its use to ensure that the load applied to the anchor is dissipated through the concrete in the best manner.In this embodiment, the main shaft has at its upper end 2, an internal bore 3 which carries a screw thread 4 adapted to receive a fastening bolt.

Adjacent its lower end 4, the main shaft 1 carries a radially extending reinforcing member 5 in the form of a steel rod which is also shown in figure 2 in plan view. The member 5 is a close fit in a transverse bore 6 in the main shaft 1.

The main shaft includes three peripheral grooves 7 which are spaced along the main shaft towards the lower end thereof.

One of the grooves is placed below the reinforcing member 5, one immediately above, and the third one spaced from this second one. The effect of the grooves is that the concrete flows into the grooves and consequently, the concrete shrinkage, which occurs on setting, further ensures that the grooves are fully filled with concrete, the dimensions of the grooves being such to ensure this.

In a typical installation, in which the anchors are used to secure a traffic barrier to a roadway, the anchor means are set to the roadway. Depending upon the installation and the loads to be borne by the anchor, a different number of grooves may be provided.

In this installation, the main shaft is 250mm long and 38mm in diameter, the grooves being 3mm in depth and 6mm in width and spaced approximately 30mm apart. The radially extending reinforcing member 5 is 16mm in diameter and lOOmm long. Prior to being set in concrete, the anchor is plated to prevent rust.

The desribed embodiment has an internal threaded bore, in which case, the anchor is typically fastened in concrete so as to be flush with the roadway surface. The barrier to be fastened thereto is secured by means of bolts. In an alternative arrangement, the shaft carries an external thread which projects above the concrete, the item to be secured thereto being placed over the thread and secured by means of a nut.

It will be understood that many variations to the anchor can be made within the ambit of the invention. For example, the size of the anchor and its constituent parts, the main shaft and the reinforcing rod, the size and number of grooves and their disposition along the shaft, and also the spacing of the anchors and the anticipated loadings.

Claims

CLAIMS:

1. Anchor means for setting in a settable material comprising a shaft, a reinforcing member extending from the periphery of the shaft and a fastening means on the shaft adapted to enable an item to be secured thereto, wherein the shaft includes a peripheral groove extending about the shaft and adapted to accommodate the settable material.

2. Anchor means according-to claim 1, wherein the shaft includes a plurality of peripheral grooves extending about the shaft and adapted to accommodate the settable material.

3. Anchor means according to claim 2, wherein the shaft includes three said peripheral grooves.

4. Anchor means according to any one of the preceding claims, wherein the peripheral groove or grooves is/are located towards one end of the shaft and the fastening means is located at the other end of the shaft.

5. Anchor means according to any one of the preceding claims, wherein the reinforcing member comprises a bar extending generally transversely through the shaft adjacent to at least one of said grooves.

6. Anchor means according to any one of the preceding claims, wherein the shaft is of circular cross-section.

7. Anchor means according to any one of the preceding claims, wherein at least the part of the shaft which is to be set in the settable material, is substantialy smooth.

8. Anchor means according to any one of the preceding claims, wherein the fastening means comprises a thread, which thread enables other items to be secured to the anchor means.

9. Anchor means according to any one of the preceding claims, wherein the groove or grooves is/are circumferential with side faces extending in a radial plane.

10. Anchor means according to any one of the preceding claims, wherein the anchor means is made of steel.

11. Anchor means according to any one of the preceding claims, wherein the anchor means is plated to prevent mist.

12. Anchor means according to any one of the preceding claims, wherein the groove or grooves is/are approximately 3mm deep and 6mm in width.

13. Anchor means according to any one of claims 2 to 12, wherein the grooves are approximately 30mm apart.

14. Anchor means for setting in a settable material, substantially as described herein with reference to, and as illustrated in the accompanying drawings.