The pneumatic support has a pneumatic body which can be placed pneumatically under pressure and which, under operating pressure, operationally keeps at a distance apart a compression member which extends substantially over its length and a tension member which likewise extends substantially over its length, wherein forces are introduced at force introduction points in end regions of the compression member and the tension member into said members and wherein connecting elements are provided between the compression member and the tension member and introduce forces into the compression member and the tension member likewise at force introduction points, wherein, furthermore, the pneumatic body has formations which extend between adjacent force introduction points and which project outwardly beyond a rectilinear connection between the adjacent force introduction points. As a result, undesired distortion of the support under operating pressure, but without operating load, is avoided.

The pneumatic support has a pneumatic body which can be placed pneumatically under pressure and which, under operating pressure, operationally keeps at a distance apart a compression member which extends substantially over its length and a tension member which likewise extends substantially over its length, wherein forces are introduced at force introduction points in end regions of the compression member and the tension member into said members and wherein connecting elements are provided between the compression member and the tension member and introduce forces into the compression member and the tension member likewise at force introduction points, wherein, furthermore, the pneumatic body has formations which extend between adjacent force introduction points and which project outwardly beyond a rectilinear connection between the adjacent force introduction points. As a result, undesired distortion of the support under operating pressure, but without operating load, is avoided.

Disclosed in the present disclosure is a double-deck multi-span bridge construction method. According to the double-deck bridge construction method of the present disclosure, construction is carried out by using a method of disassembling a support jig frame in a graded and span-separated mode, an upper chord jig frame and a lower chord jig frame can be used in a recycle manner, and construction costs are reduced. In addition, a construction period of building the support jig frame is shortened, and other construction operations can be synchronously carried out on a span in which the jig frame is disassembled, for example, fire retardant coating construction can be carried out on a mounted bridge deck after the jig frame is disassembled, and the construction period of a double-deck multi-span bridge is effectively shortened. Additionally, according to the double-deck multi-span bridge construction method in embodiments of the present disclosure, the upper chord jig frame and the lower chord jig frame are disassembled in a graded manner, thereby ensuring that a bridge structure can be smoothly and safely transitioned to a designed stress state.

Disclosed in the present disclosure is a double-deck multi-span bridge construction method. According to the double-deck bridge construction method of the present disclosure, construction is carried out by using a method of disassembling a support jig frame in a graded and span-separated mode, an upper chord jig frame and a lower chord jig frame can be used in a recycle manner, and construction costs are reduced. In addition, a construction period of building the support jig frame is shortened, and other construction operations can be synchronously carried out on a span in which the jig frame is disassembled, for example, fire retardant coating construction can be carried out on a mounted bridge deck after the jig frame is disassembled, and the construction period of a double-deck multi-span bridge is effectively shortened. Additionally, according to the double-deck multi-span bridge construction method in embodiments of the present disclosure, the upper chord jig frame and the lower chord jig frame are disassembled in a graded manner, thereby ensuring that a bridge structure can be smoothly and safely transitioned to a designed stress state.

The pneumatic support has a pneumatic body which can be placed pneumatically under pressure and which, under operating pressure, operationally keeps at a distance apart a compression member which extends substantially over its length and a tension member which likewise extends substantially over its length, wherein forces are introduced at force introduction points in end regions of the compression member and the tension member into said members and wherein connecting elements are provided between the compression member and the tension member and introduce forces into the compression member and the tension member likewise at force introduction points, wherein, furthermore, the pneumatic body has formations which extend between adjacent force introduction points and which project outwardly beyond a rectilinear connection between the adjacent force introduction points. As a result, undesired distortion of the support under operating pressure, but without operating load, is avoided.

A supporting framework having at least one connector and at least two bars arranged on the connector. The bars are preferably arranged on the connector at the longitudinal end regions thereof. The connection between the bars and connector is achieved by at least one bolt, in particular, by two bolts. The bolt is or the bolts are preferably designed in the form of plug-in bolts, in particular fit bolts. The bolt has or the bolts have preferably a diameter of more than 28 mm that acts in the connection to the connector. The bars are formed from a steel having an upper yield strength of above 490 MPa. The bar height is less than 200 mm. The bars, bolts, and connector are preferably part of a lattice truss of the supporting framework, wherein the lattice truss has a lattice truss height of at least 2100 mm.

A supporting framework having at least one connector and at least two bars arranged on the connector. The bars are preferably arranged on the connector at the longitudinal end regions thereof. The connection between the bars and connector is achieved by at least one bolt, in particular, by two bolts. The bolt is or the bolts are preferably designed in the form of plug-in bolts, in particular fit bolts. The bolt has or the bolts have preferably a diameter of more than 28 mm that acts in the connection to the connector. The bars are formed from a steel having an upper yield strength of above 490 MPa. The bar height is less than 200 mm. The bars, bolts, and connector are preferably part of a lattice truss of the supporting framework, wherein the lattice truss has a lattice truss height of at least 2100 mm.

A large-span corridor structure composed of arc-shaped cantilever trusses and stay cable supporting structures is provided, comprising cantilever trusses with arc-shaped facades, orthogonal connecting trusses at a corridor, connecting trusses at cantilever portions, corridor truss structures, and stay cable supporting structures; the cantilever trusses with arc-shaped facades are composed of two sets of ultra-long cantilever trusses with arc-shaped facades and triquetrous planes which are supported by ground and symmetrical, and each are set of ultra-long cantilever trusses with arc-shaped facades and triquetrous planes are formed of several ultra-long cantilever trusses with arc-shaped facades and triquetrous planes arranged in parallel at a certain distance. The beneficial effects of the present disclosure are: the large-span corridor structure composed of arc-shaped cantilever trusses and stay cable supporting structures provided serves the combination of the cantilever trusses with arc-shaped facades and the orthogonal truss at the corridor as the supporting truss core system, and the performance of lateral force resistance and torsion resistant of the overall structure can be enhanced by the connecting trusses at cantilever portions.

A large-span corridor structure composed of arc-shaped cantilever trusses and stay cable supporting structures is provided, comprising cantilever trusses with arc-shaped facades, orthogonal connecting trusses at a corridor, connecting trusses at cantilever portions, corridor truss structures, and stay cable supporting structures; the cantilever trusses with arc-shaped facades are composed of two sets of ultra-long cantilever trusses with arc-shaped facades and triquetrous planes which are supported by ground and symmetrical, and each are set of ultra-long cantilever trusses with arc-shaped facades and triquetrous planes are formed of several ultra-long cantilever trusses with arc-shaped facades and triquetrous planes arranged in parallel at a certain distance. The beneficial effects of the present disclosure are: the large-span corridor structure composed of arc-shaped cantilever trusses and stay cable supporting structures provided serves the combination of the cantilever trusses with arc-shaped facades and the orthogonal truss at the corridor as the supporting truss core system, and the performance of lateral force resistance and torsion resistant of the overall structure can be enhanced by the connecting trusses at cantilever portions.

A two-way structural system for construction, comprising a base part (1) with a plurality of longitudinal channels (1.1) and a plurality of transverse channels (1.2) that are evenly 5 distributed, a stiffening part (2) with a plurality of holes (2.3) along the sheets (2.1, 2.2); wherein both parts (1 and 2) are made of FRP material, and wherein the stiffening part (2), in an operational position, is connected by resting on the base part (1) and fitting into the corresponding channels (1.1, 1.2), defining a cavity in the channels (1.1, 1.2) between both parts (1, 2) to be filled with fibre-reinforced concrete, the assembly forming an integral structure once the concrete has set, and both parts (1.1, 1.2) being configured as a self-supporting structure against the pouring of the concrete. A building method for constructing bridges, tunnels and underground works, with the two-way structural system.