Such site fences are usually arranged standing adjacent of each other round a building site, wherein the fences have to be mutually connected with a coupling means.

It is known to do this with two wing profiles, wherein these are mutually coupled by means of a bolt construction. This construction is accessible and can be easily removed by unauthorized persons.

The invention has for its object to provide an assembly wherein this is no longer possible, and only authorized persons can release the coupling.

The invention provides for this purpose a connecting assembly which is distinguished in that at least the one wing profile is provided in the centre with a continuous hole for receiving the bolt connected beforehand non-rotatably to the other wing, wherein a protective member is arranged which is mounted around the hole and has a space for receiving in countersunk manner a nut body for rotating onto the bolt, and wherein the height of the protective member is greater than the height of the nut body.

Because the nut body now lies wholly flush in the protective member, the nut body can no longer be engaged by a random nut spanner. By further embodying the nut body with a special pattern of recesses which co-acts with a special tool

which is formed to fit thereon, this tool can be rotated by for instance an electric screwdriver or other type of hand- tool, and it is moreover ensured that the nut body can be easily fastened or removed, although only by authorized persons.

In a further embodiment the protective member can take a cup-like form, wherein the base of the cup can be welded to one of the wing profiles.

In a preferred embodiment the bolt is provided with a widened head which is embodied with a non-round undercut, wherein the hole in the other wing profile is correspondingly non-round. This achieves that the threaded shank of the bolt does not co-rotate when the nut body is tightened.

In another embodiment the threaded shank of the bolt can be fixed directly onto the other wing profile, for instance by means of a welding operation.

The invention will be further elucidated in the figure description hereinbelow of a number of exemplary embodiments.

In the drawing : fig. 1 shows a perspective schematic view of two site fences mutually coupled by means of the assembly according to the invention ; fig. 2 is a perspective view of the two wing profiles with a profile bolt with nut body for placing therethrough; fig. 3 shows a variant of the fixing of the shank to the wing profile.

In the figures the one site fence is designated with A and the other with B, and these are constructed in the usual manner from two posts (1) with wire mesh (2) arranged therebetween. Each post (1) can be of random type and usually consists of a tube profile. The wire meshes can also be of random construction, for instance of horizontal and vertical wires welded fixedly to each other in a grid pattern, wherein

curvatures can be arranged in the surface to increase the bending stiffness. This is assumed to be generally known.

Each post (1) can be placed with a foot in a hole or recess of a concrete block or the like, to enable upright placing of each site fence and assembly with other site fences to form a random perimeter fence.

In order to increase the strength and successfully keep out intruders, the posts (1) extending adjacently of each other can be mutually connected by a connecting assembly S according to the invention.

The connecting assembly is shown in figure 2 and consists of two wing profiles (3, 4) which are constructed from plate material and formed such that a wave-like shape is obtained, wherein the ends come to lie on either side of posts (1).

The two wing profiles are connected to each other by a clamping construction consisting of a bolt (6) with a co- acting nut body (7).

In the middle of the wing profiles is arranged a continuous hole (8) for receiving the shank (9) of bolt (6).

In figure 2 a cup-like protective member (10) is arranged around hole (8) on the front side of wing profile (3). It is a peripheral cup which has a height H such that it is greater than the height h of nut body (7). After assembly, i. e. after shank (9) has been fed through opening (8) and nut body (7) has been arranged on shank (9) of bolt (6), the nut body comes to lie wholly countersunk in the cup-like protective member (10). Nut body (7) is embodied with recesses 11 which can be arranged in a random pattern along the periphery, and with which a tool with matching protrusions can be placed in the recesses (11).

Using this tool the nut body (7) can be tightened onto the shank of bolt (6), or can be loosened for assembly

purposes.

In order to prevent rotation of bolt (6) in the hole of wing profile (4), there is arranged an undercut (12) which has a square shape. This square undercut (12) fits into the corresponding square hole (8') of wing profile (4) to prevent rotation of the shank.

In another embodiment the shank (9') can be welded directly onto the wing profile, see figure 3.

The invention is not limited to the above described embodiments.