The invention relates to the technical field of construction of large-span concrete arch bridges, in particular to a concrete pouring formwork for an outer wrapping bottom plate of an arch bridge anda construction method thereof. The outer wrapping bottom plate concrete pouring formwork comprises a plurality of stiff skeleton sections with bottom formworks, and the stiff skeleton sections are fixedly connected in sequence. Each stiff skeleton section with the bottom formwork comprises a stiff skeleton section, a bottom formwork and a connecting plate, and the bottom formwork and the connecting plate correspond to the stiff skeleton section. In each stiff skeleton section with the bottom formwork, the lower chord of each stiff skeleton section is fixedly connected with the corresponding bottom formwork through the corresponding connecting plate. The invention further discloses a construction method of the concrete pouring formwork for the outer wrapping bottom plate of the arch bridge.According to the concrete pouring formwork for the outer wrapping bottom plate, a rigid mold can be provided for concrete pouring of the outer wrapping bottom plate of a stiff framework, the weight of the formwork and the weight of a formwork auxiliary structure can be reduced, the windward area is reduced, the engineering construction period can be shortened, and the engineering safety degree can be improved.

Concrete pouring formwork for outer wrapping bottom plate of arch bridge and construction method thereof

The invention relates to a self-walking template hoisting tool used for the high-altitude cast in situ of a bowstring arch bridge cross beam, and a method The self-propelled template hoisting tool comprises an upper truss, wherein a bottom plate is arranged below the upper truss; the bottom plate and the bottom end surface of the upper truss are in parallel; a working space is formed between thebottom plate and the upper truss and can permit two collar beams which are mutually in parallel to pass; the upper truss and the bottom plate are fixedly connected through main hanger rods; a relativeposition relationship between the main hanger rods and the upper truss is set as follows: when the upper truss and the bottom plate move along a collar beam extension direction, a cross beam betweenthe two collar beams does not affect the movement of the main hanger rods; the lower end surface of the upper truss is provided with a walking device; the walking device can be supported through the collar beams and can walk along the collar beam extension direction; and a distance between the upper truss and the bottom plate can be regulated through the main hanger rods to regulate a distance between the bottom plate and the collar beams which penetrate through the working space in a vertical direction

Self-working template hoisting tool used for high-altitude cast in situ of bowstring arch bridge cross beam, and method

The invention provides a system for unloading steel boxed cofferdam continuously The system comprises traction steel bars, upper carrying pole beams, jacks, spandrel girders and lower carrying pole beams, wherein all the components except the traction steel bars are connected with the traction steel bars in sleeve mode from the top to the bottom The system also comprises suspension steel bars which connect the upper carrying pole beam, the spandrel girders and the lower carrying pole beams in serial connection mode A method applying the system for unloading steel boxed cofferdam continuously is also provided The system is suitable for the traction steel bars provided with connection joints Compared with the prior arts, the system has the advantages of being simple in operation, being stable, reliable and safe, reducing accident incidence rate, and at the same time obviously elevating work efficiency

System and method for unloading steel boxed cofferdam continuously

The invention discloses a structure for embedded installation of an arch foot of a tied-arch bridge steel structure. The structure comprises a concrete bearing platform, a plurality of embedded steelplates arranged on the concrete bearing platform and limiting structures arranged on the embedded steel plates. The structure has the beneficial effects that the positioning and limiting effects on installation of the arch foot can be achieved through the limiting structures, the positioning and installing precision of the arch foot can be improved when the arch foot is installed, repeated adjusting is avoided, and the construction efficiency can be improved; and the arch foot is supported through the concrete bearing platform, therefore, the height of the whole concrete bearing platform can be adjusted according to the actual condition of the construction site to adapt to installation of the arch foot, and it is guaranteed that the position of the arch foot meets the construction requirements.

Structure for embedded installation of arch foot of tied-arch bridge steel structure

The invention discloses a steel arch rib outer wrapped concrete construction method for a steel trussed arch bridge and relates to the technical field of building construction of steel trussed arch bridges. The construction method includes the steps that each steel arch rib section to be poured with concrete is provided with a hanging bracket system and a bottom formwork; after installation is finished, bottom board reinforcing steel bars are tied; each hanging bracket system is used for erecting a construction support and an operation platform, web reinforcing steel bars and a web formwork of a first ring construction section are installed, and the outer wrapped concrete is poured to the first ring construction section; after the concrete is poured, an inner cavity support and a platform are erected, a high construction support and an operation platform are connected, reinforcing steel bars and a formwork of a second ring construction section are installed, and the outer wrapped concrete is poured to the second ring construction section; and after the concrete is poured, outer wrapped concrete construction of the next steel arch rib section is started, and the operation is repeated till the concrete is poured to all the steel arch rib sections. By the adoption of the method, the construction difficulty is lowered, the application range is wide, construction efficiency is effectively improved, construction safety is guaranteed, and adaptability and economical efficiency are high.

Steel arch rib outer wrapped concrete construction method for steel trussed arch bridge

The invention discloses a steel box arch bridge arch foot steel-concrete combined section installing positioning support and an alignment method. The support is used for installing and alignment of asteel-concrete combined section and arch foot concrete; the wall, for alignment and installation, of the arch foot concrete is an abut-joint face, the side wall below the abut-joint face is a supporting face, and the transverse bridge two side walls are limiting faces; the positioning support comprises a supporting truss set and two lateral limiting trusses; the supporting truss set comprises a plurality of supporting trusses, each supporting truss is provided with a supporting section and an installing section, and each supporting section is provided with a sliding way for bearing the steel-concrete combined section; the positioning support has the installing state. When the positioning support is in the installing state, the multiple supporting trusses are arranged in the transverse bridge direction at intervals, and the installing section is fixed to the supporting face; the bottom ends of the two lateral limiting trusses are fixed to the two limiting faces, and the top ends of thetwo lateral limiting trusses, the abut-joint face and the supporting section form a space for sliding the steel-concrete combined section. The positioning support is simple in structure, when the support is in use, the support is directly installed on arch foot concrete, and the assembling and disassembling procedures are simple.

Steel box arch bridge arch foot steel-concrete combined section installing positioning support and alignment method

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Steel arch rib outer wrapped concrete construction method for steel trussed arch bridge

Steel box arch bridge arch foot steel-concrete combined section installing positioning support and alignment method