Connection assembly, levelling or lifting system, and method of levelling a slab

A levelling or lifting system for a slab, comprising:

• a connection assembly for connecting a bolt to the slab, the connection assembly comprising:
• a first connection part comprising:
• a first clamping member;
• and
• a first hollow-tubular-connecting-structure extending from the first clamping member, the first hollow-tubular-connecting-structure having a threaded interior wall and an exterior wall having a first engagement element;
• and
• a second connection part comprising:
• a second clamping member;
• and
• a second hollow-tubular-connecting-structure extending from the second clamping member, the second hollow-tubular-connecting-structure having an interior wall having a second engagement element, wherein an inner diameter of the second hollow-tubular-connecting-structure is equal or larger than an outer diameter of the first hollow-tubular-connecting-structure and wherein the second clamping member comprises an opening providing access to an inner cavity of the second hollow-tubular-connecting-structure,
• wherein the first connection part and the second connection part are connectable to each other with the first hollow-tubular-connecting-structure of the first connection part and the second hollow-tubular-connecting-structure of the second connection part aligned along a connection axis and directed towards each other such that the first hollow-tubular-connecting-structure is insertable into the second hollow-tubular-connecting-structure to form a connection along the connection axis with the first engagement element of the exterior wall of the first hollow-tubular-connecting-structure and the second engagement element of the interior wall of the second clamping member engaged to each other,
• wherein the first clamping member comprises an opening providing access to an inner cavity of the first hollow-tubular-connecting-structure of the first connection part, whereby the bolt screwed into the first hollow-tubular-connecting-structure of the first connection part through the opening in the second clamping member of the second connection part is capable of penetrating the first connection part to protrude from the opening of the first clamping member;
• the slab;
• and
• a levelling bolt or a lifting bolt,
• wherein the first connection part of the connection assembly and the second connection part of the connection assembly are connected to each other in a manner so as to sandwich the slab between the first clamping member of the first connection part and the second clamping member of the second connection part between two opposite surfaces of the slab,
• wherein the first hollow-tubular-connecting-structure of the first connection part and the second hollow-tubular-connecting-structure of the second connection part are aligned along the connection axis which extends through a through-hole of the slab extending between the two opposite surfaces of the slab and are directed towards each other, and the first hollow-tubular-connecting-structure is inserted into the second hollow-tubular-connecting-structure to form the connection between the first hollow-tubular-connecting-structure and the second hollow-tubular-connecting-structure along the connection axis within the through-hole of the slab,
• wherein the first engagement element of the exterior wall of the first hollow-tubular-connecting-structure and the second engagement element of the interior wall of the second clamping member are engaged to each other,
• wherein the levelling bolt or the lifting bolt is connected to the slab, for lifting or levelling the slab, by screwing the levelling bolt or the lifting bolt into the first hollow-tubular-connecting-structure of the first connection part through the opening in the second clamping member of the second connection part, whereby the levelling bolt or the lifting bolt is in threaded engagement with the threaded interior wall of the first hollow-tubular-connecting-structure.

A method of levelling a slab, the method comprising:

• assembling a connection assembly to the slab, for connecting a bolt to the slab, wherein the connection assembly comprises:
• a first connection part comprising:
• a first clamping member;
• and
• a first hollow-tubular-connecting-structure extending from the first clamping member, the first hollow-tubular-connecting-structure having a threaded interior wall and an exterior wall having a first engagement element;
• and
• a second connection part comprising:
• a second clamping member;
• and
• a second hollow-tubular-connecting-structure extending from the second clamping member, the second hollow-tubular-connecting-structure having an interior wall having a second engagement element, wherein an inner diameter of the second hollow-tubular-connecting-structure is equal or larger than an outer diameter of the first hollow-tubular-connecting-structure and wherein the second clamping member comprises an opening providing access to an inner cavity of the second hollow-tubular-connecting-structure,
• wherein the first connection part and the second connection part are connectable to each other with the first hollow-tubular-connecting-structure of the first connection part and the second hollow-tubular-connecting-structure of the second connection part aligned along a connection axis and directed towards each other such that the first hollow-tubular-connecting-structure is insertable into the second hollow-tubular-connecting-structure to form a connection along the connection axis with the first engagement element of the exterior wall of the first hollow-tubular-connecting-structure and the second engagement element of the interior wall of the second clamping member engaged to each other,
• wherein the first clamping member comprises an opening providing access to an inner cavity of the first hollow-tubular-connecting-structure of the first connection part, whereby the bolt screwed into the first hollow-tubular-connecting-structure of the first connection part through the opening in the second clamping member of the second connection part is capable of penetrating the first connection part to protrude from the opening of the first clamping member,
• wherein the connection assembly is assembled to the slab in a manner so as to sandwich the slab between the first clamping member of the first connection part of the connection assembly and the second clamping member of the second connection part of the connection assembly and with the connection between the first hollow-tubular-connecting-structure and the second hollow-tubular-connecting-structure within a through-hole in the slab;
• and
• connecting a levelling bolt to the connection assembly by screwing the levelling bolt into the first hollow-tubular-connecting-structure of the first connection part through the opening in the second clamping member of the second connection part in a manner so as to penetrate the first hollow-tubular-connecting-structure of the first connection part to protrude from the opening of the first clamping member of the first connection part.