초록 ▼

A concrete control key-joint and divider form made from plastic which is substantially wedge-shaped with vertically spaced holes to receive plastic stakes with the stakes being secured to the plastic form by plastic bolts at substantially its mid-section, so that the form can be easily set to grade

A concrete control key-joint and divider form made from plastic which is substantially wedge-shaped with vertically spaced holes to receive plastic stakes with the stakes being secured to the plastic form by plastic bolts at substantially its mid-section, so that the form can be easily set to grade and locked to the stakes, then the plastic stakes and bolts can be cut off to form a smooth screeding surface and an expansion joint. The forms also provide transversely spaced holes through which smooth rods or rebar may be inserted to firmly hold the form in a vertical manner and yet allow the concrete slabs to expand and contract. The plastic material is also designed to expand and contract at substantially the same expansion coefficient as cured concrete, thus minimizing the working of the key-joint.

대표청구항 ▼

A plastic concrete joint form and supporting stakes comprising; a plastic elongated member, said member being in its transverse, cross section, substantially wedge-shaped, said member having a first set of spaced holes in its vertical plane, said first set of spaced holes cooperating with plastic st

A plastic concrete joint form and supporting stakes comprising; a plastic elongated member, said member being in its transverse, cross section, substantially wedge-shaped, said member having a first set of spaced holes in its vertical plane, said first set of spaced holes cooperating with plastic stakes, said plastic stakes being of a sufficient size and length to penetrate said plastic member through said first set of spaced holes and enter a supporting surface, said substantially wedge-shaped member having a second set of spaced holes in its transverse horizontal plane, said second set of spaced holes cooperating with said first set of spaced holes to allow plastic bolts to be threadably engaged in said substantially wedge-shaped member to engage said plastic stakes, securely holding said plastic member and said plastic stakes in a fixed relationship, said plastic member having a third set of spaced holes, said third set of spaced holes being located substantially at the mid-section of said substantially wedge-shaped member in its transverse, horizontal plane, said third set of spaced holes cooperating with sections of rebar to allow said rebar to be inserted transversely through said third set of spaced holes and protrude on both sides of said plastic substantially wedge-shaped member.