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Ultra-large span three-dimensional pre-stress beamless circular plate construction method

A three-way prestressing and construction method technology, applied in construction, building construction, etc., can solve problems such as construction difficulties, formwork damage, waste of funds, etc., to achieve quality and structural safety savings, guarantee construction period, and improve efficiency. Effect

Active Publication Date: 2008-09-24
CHINA CONSTR SIXTH ENG DIV CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the conventional construction method, it should be: erecting a conventional full-height shelf, due to the heavy weight of the slab, it will cause excessive construction pressure on the bottom slab; Smooth; ordinary steel bars are pre-processed and shaped at the processing site and then hoisted to the floor for installation. The distribution bars are arranged in a ring shape, resulting in unnecessary waste of labor and steel bars; There are few intersection points between prestressed stresses, and there is no treatment method for the intersection of three-way tendons, and the influence of the circular horse stool on the prestressed sagittal height will not be considered, resulting in too long or too short prestressed tendons, and the local sagittal height cannot meet the design requirements ; An operation platform is set up on the operation floor, and bonded prestressed tendons are threaded on the operation platform, or trusses are used to hoist the bonded prestressed tendons and unbonded prestressed tendons that are threaded first, which will The construction is troublesome and the operation is unsafe; the part where the prestressed tendons grow out is realized by punching holes in the formwork, resulting in the destruction of large formwork
The concrete flowing in at the bottom of the prestressed intersection is normally vibrated without special treatment, so that the content of stones in the concrete here is low and the strength cannot meet the design requirements; the impact on the upper concrete slab should not be considered during tensioning, and the upper slab should be formed Damaged by anti-arching; the tension sequence of the slab prestressed tendons is not very strict, resulting in inaccurate establishment of the prestressed value of the slab
These conventional construction methods will not only affect the construction period, construction difficulties, waste of funds, and even affect the safety of the structure

Method used

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  • Ultra-large span three-dimensional pre-stress beamless circular plate construction method
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  • Ultra-large span three-dimensional pre-stress beamless circular plate construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (a) preparing a plurality of prestressed steel bars with a length of 300mm exposed on the outer edge of the concrete slab, the prestressed steel bars adopt low-relaxation steel strands, and the steel strands are bundled, and each The tension ends and the anchor ends in the bundle are arranged alternately; (b) use erection steel pipes as oblique rods and upper horizontal rods and pull bolts on the cylinder wall to form a triangular bracket; (c) lay circular plates on the triangular brackets Bottom mold, the laying sequence is to lay the bottom mold template in the middle of the circular plate first, then support the armpit template, and finally lay the bottom mold on the edge of the circular plate. The size is 0.9m, and the middle bottom formwork is ridged according to the vertical axis to ensure that the highest arching height of the central point is 3‰ of the span; Lay the ordinary reinforcing bars at the bottom of the unequal long plate at the bottom edge of the circu...

Embodiment 2

[0030] (a) preparing a plurality of prestressed steel bars with a length of 400mm exposed on the outer edge of the concrete slab, the prestressed steel bars adopt low-relaxation steel strands, and the steel strands are bundled, and each The tension ends and the anchor ends in the bundle are arranged alternately; (b) use erection steel pipes as oblique rods and upper horizontal rods and pull bolts on the cylinder wall to form a triangular bracket; (c) lay circular plates on the triangular brackets Bottom mold, the laying sequence is to lay the bottom mold template in the middle of the circular plate first, then support the armpit template, and finally lay the bottom mold on the edge of the circular plate. The size is 0.95m, and the middle bottom formwork is ridged according to the vertical axis to ensure that the highest arching height of the central point is 3‰ of the span; Lay the ordinary reinforcing bars at the bottom of the unequal long plate at the bottom edge of the circ...

Embodiment 3

[0033](a) preparing a plurality of prestressed steel bars with a length of 200mm exposed on the outer edge of the concrete slab, the prestressed steel bars adopt low-relaxation steel strands, and the steel strands are bundled, and each The tension ends and the anchor ends in the bundle are arranged alternately; (b) use erection steel pipes as oblique rods and upper horizontal rods and pull bolts on the cylinder wall to form a triangular bracket; (c) lay circular plates on the triangular brackets Bottom mold, the laying sequence is to lay the bottom mold template in the middle of the circular plate first, then support the armpit template, and finally lay the bottom mold on the edge of the circular plate. The size is 1.0m, and the middle bottom formwork formwork is ridged according to the vertical axis to ensure that the arching height at the highest point of the center point is 3‰ of the span; Lay the ordinary reinforcing bars at the bottom of the unequal long plate at the bott...

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Abstract

The invention discloses an ultra-large span three-direction prestressed beam-free disk construction method which includes the following steps: preparing a plurality of prestressed reinforcements which adopt nderrelaxation strand; paving a disk bed die on a rectangle bracket; paving common reinforcing steel bars for the bottom plates of the disk; binding a plurality of arc split heads on the edge part of the disk; carrying out prestressed ribs on an operation layer; paving radial split heads above the prestressed ribs; distributing common reinforcing steel bars on the top of spiral collocating plates above the radial split heads; paving the main ribs at the top of radial plates above the spirally distributed ribs; paving haunch ribs on haunch templates; carrying out concrete pouring and stretching the prestressed ribs; sealing an anchor and grouting. Not only the project period, the quality and the safety of a structure can be ensured, but also capitals can be saved by adopting the method to construct.

Description

technical field [0001] The invention relates to a construction method of a prestressed circular slab, in particular to a construction method of a beamless circular slab with a large span and equipped with prestressed tendons in three directions. Background technique [0002] At present, prestressed beamless slabs are mostly rectangular, and the span generally does not exceed 15m, and the layout direction is generally one-way or two-way. Even the layout of prestressed tendons in circular slabs is mostly radial. board is similar. [0003] According to the conventional construction method, it should be: erecting a conventional full-height shelf, due to the heavy weight of the slab, it will cause excessive construction pressure on the bottom slab; Smooth; ordinary steel bars are pre-formed at the processing site and then hoisted to the floor for installation. The distribution bars are arranged in a ring shape, resulting in unnecessary waste of labor and steel bars; There are f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04B1/16E04B1/06
Inventor 张通利贺国利于吉鹏张杰
Owner CHINA CONSTR SIXTH ENG DIV CORP
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