Double-machine double-layer continuous slip-form concrete paving construction application

Abstract

The invention discloses double-machine double-layer continuous slip-form concrete paving construction application, which specifically comprises the following steps: adopting two slip-form pavers to carry out double-machine double-layer echelon combined slip-form paving construction operation. The method comprises the following steps that: (1), a front slip-form paver with an IDBI device performs slip-form paving construction on a first bottom layer in front; the forming width is the sum of the width of the main lane and the width of the curb strip, the forming thickness is 2 / 3 of the design thickness, a dowel bar is automatically implanted, and the embedding depth is equal to 2 / 3 of the design thickness minus 1 / 2 of the design thickness; (2), a rear slip-form paver is close to the front slip-form paver for paving a second upper layer, the paving width is consistent with that of the first bottom layer, and the thickness is 1 / 3 of the designed thickness; and (3), the distance between the foremost side of a front crawler belt of the rear paver and the rearmost side of a rear crawler belt of the front paver to be 8 meters, and synchronization is performed during paving. The application has the effect that the flatness qualification rate of the concrete on the forming surface is high, and the defect of the concrete above the dowel bar caused when the dowel bar is placed is overcome.

Description

technical field [0001] The invention relates to the field of cement concrete pavement sliding form construction, in particular to the construction application of double-machine double-layer continuous sliding form paving concrete. Background technique [0002] At present, the slipform paving construction of domestic expressway cement concrete pavement uses a single slipform concrete paver with a dowel device for single-layer concrete slipform paving. During the slipform paving process, mainly Implant the dowel bar according to the set conditions. There are following deficiencies in the above-mentioned construction method: [0003] ⑴ The flatness of the formed cement concrete pavement is poor. During the implantation process of the dowel bar, the forming plate of the paver will warp up to varying degrees due to the magnitude of the reaction force received when the dowel bar is implanted, thus affecting the flatness of the paving forming surface. [0004] (2) The quality of...

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Problems solved by technology

[0003] (1) Poor flatness of formed cement concrete pavement

During the implantation process of the dowel bar, the forming plate of the paver will warp up to varying degrees due to the reaction force received when the dowel bar is implanted, thus affecting the flatness of the paving forming surface

[0004] (2) The quality of the concrete above the dowel bars on the formed cement concrete pavement does not meet the specification requirements, mainly due to insufficient strength and voids

It is because the implantation depth of the dowel bar is too deep (generally 15CM, that is, 1 / 2 of the thickness of the slab), that is, the concrete coarse aggregate is squeezed out during the implantation process, and the top of the dowel bar can only rely on mortar or fine aggregate. Aggregate filling, and sometimes there are voids due to insufficient filling

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