Lattice mast crane and lattice mast boom

1. A lattice mast crane having a lattice mast boom arranged to be be luffed up in a vertical luffing plane and which comprises

a pivotal connection piece,

a plurality of lattice pieces arranged to be releasably connectable to one another and form a lateral multi-strand region in the lattice boom, wherein

at least one side part is releasably connectable to the pivotal connection piece and at least one of the lattice pieces in the multi-strand region,

the pivotal connection piece is centrally disposed between lattice pieces forming the lateral multi-strand region in a longitudinal direction of the boom and has a substantially rectangular cross-section,

said at least one side part is laterally arranged against the pivotal connection piece and

bolt connections between the lattice pieces and both the pivotal connection piece and at least one side part extend transversely to the longitudinal direction of the boom.

2. A lattice mast crane in accordance with claim 1 , wherein the pivotal connection piece has at least one lateral bolting site for fastening at least one side part.

3. A lattice mast crane in accordance with claim 1 , wherein the two-strand or multi-strand region is connected to the pivotal connection piece via an intermediate piece, in particular via a cross-beam.

4. A lattice mast crane in accordance with claim 3 , wherein the intermediate piece is connected to the pivotal connection piece and additionally to at least one side part of the pivotal connection piece, by at least one bolt connection.

5. A lattice mast crane in accordance with claim 1 , wherein the connections between the lattice pieces or of the lattice pieces to the intermediate piece or pieces and/or to the pivotal connection piece and/or to the side part are bolt connections, with the longitudinal axis of at least one bolt extending transversely to the luffing plan.

6. A lattice mast crane in accordance with claim 5 , wherein all the bolt connections between the lattice pieces and the cross-beam are designed with a longitudinal bolt axis transversely to the luffing plane.

7. A lattice mast crane in accordance with claim 1 , wherein the two-strand or multi-strand region is connected to the single-strand region via an intermediate piece, via a cross-beam.

8. A lattice mast crane in accordance with claim 1 , wherein the width of the lattice mast boom in the multi-strand region is approximately tripled in comparison with a single-strand region.

9. A lattice mast crane in accordance with claim 1 , wherein said at least one side part has triangular base surface.

10. A lattice mast crane in accordance with claim 1 , comprising

two said lattice pieces arranged side-by-side in the multi-strand region in a direction transverse to the longitudinal direction of the boom,

two said side parts arranged on opposite sides of said pivotal connection piece and connectable to said pivotal connection piece at bolting sites,

and four said bolt connection ( 22 ), two said bolt connections inwardly-positioned in the transverse direction for connecting a respective one of said two lattice pieces to said pivotal connection piece and two said bolt connections outwardly-positioned in the transverse direction for connecting a respective one of said side parts to said pivotal connection piece.

11. A lattice mast crane in accordance with claim 10 , wherein a transverse width of each of the lattice mast pieces as measured from corner stem regions thereof in the multi-strand region is substantially identical and transverse width of (A) the pivotal connection piece between corner stem regions thereof is also substantially identical to the transverse width of the adjacent lattice mast pieces in the multi-strand region.