Bridge engineering construction: button bowl full framing set-up requirements

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Bridge engineering construction: button bowl full framing set-up requirements

In order to ensure the support to satisfy the bearing requirement, in support build-up process and acceptance, should pay attention to the following:

(1) to play the supporting materials for inspection acceptance, stent corroded seriously insufficient, wall thickness, size (such as pipe diameter, wall thickness, connect the strength of the fastener, toughness) of plan calls for bans the use, such as stow-wood decay length, width, thickness and inadequate bans the use, buckle, stud, bar, jacking and tap must conform to the requirements. New components for a product quality certification, to have a inspection method associated with existing national standards of quality inspection report, quality of steel pipe and deviation must conform to the rules.

(2) the steel pipe diameter and wall thickness deviation is allowed according to the regulation of the current national standard.

(3) in accordance with the approved plan layout, and hanged line installation, ensure that support vertical and horizontal spacing requirements, in the large longitudinal slope and ultra strong encryption for oblique shear brace and the lateral connection rods, overcome the horizontal thrust, strengthen the stability of support. Reasonable arrangement according to the height of box girder bracket layers. Top, tap and stow-wood, stow-wood and foundation or template of contact surface should be smooth, tight, prohibit the impending phenomenon.

(4) all construction of cast-in-situ box girder bracket must each part comprehensively preloading, in order to verify the support stiffness, strength and stability, to ensure its safety, reduce frame, the template of the settlement, to ensure the construction quality of box girder. In principle, the preloading load cannot be less than 120% of the weight of box girder. During the period of preloading construction and preloading stationing observation records should be not less than 5 days. Can be set up according to the observation data analysis of camber, box girder construction. When the maximum subsidence rate and cumulative settlement than when required, should report to treatment scheme, adjust the construction plan.

(5) scaffold bracing position, quantity, should according to the requirements of the construction and plan of the layout. Scissors poles of lap length is greater than 1 m, connection fasteners or less than 3.

(6) we will strictly control the top and tap screw of the exposed length is less than 20 cm of norms.

(7) scaffold vertical control and asked for the inclination of the scaffold is not more than 50 H /. Whether horizontal reinforcing rod, such as shear through the configuration of the operator and design requirements.