After welding, the weld shall be polished, the inner side of the steel formwork shall be painted with antirust paint, and the outer side shall be painted with isolating agent for standby.
The traditional method of caisson construction in toilet is to use wood formwork.
Key points of process flow operation 1.
Design drawing of shaped steel formwork design drawing II of shaped steel formwork 2) four corners of shaped steel formwork Φ 20 the pull ring passes through the upper wing plate and is welded to the inner wall of the steel formwork.
In order to prevent welding deformation, spot welding assembly shall be carried out first, and large-area welding shall be carried out after the connecting rod and pull rod are spot welded and fixed, and the size and flatness are rechecked.
The specific method is shown in the figure below.
Installation and positioning of shaped steel formwork Figure 3 removal of shaped steel formwork 1.
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At the same time, in order to ensure the integrity of the steel formwork, L60 * 60 * 5 connecting rod and split pull rod are set at the corner.
After the construction of elevation positioning bar is completed, the finalized steel formwork can be hoisted for plane positioning review.
As shown in the figure below.
Design drawing III of shaped steel formwork (3) jacking parts Φ 30 bolt, jacking arm and snap ring are welded and matched with small manual Jack to remove the overall steel formwork.
The method is shown in the figure below.
One side steel formwork shall be processed and formed according to the design size and shape in the processing plant in advance, and assembled and welded on site.
Shaped steel formwork design drawing IV shaped steel formwork design drawing V 2.
The defects existing in the traditional wood formwork construction, such as falling plate hanging formwork expansion, missing edges and corners, slurry leakage holes and leakage, are solved fundamentally, and the prevention effect of structural leakage is remarkable; Assembly construction, high turnover construction and improve construction efficiency.
The steel formwork is formed by cold pressing of 3.0 thick steel plate.
Jack up the jacking parts installed at the four corners of the shaped formwork one by one, so that the overall shaped steel formwork is basically separated from the concrete side wall (the design upper opening size of the overall formwork is slightly larger than the lower opening size), and then use the tower crane to lift it away from the operation layer for maintenance.
In this construction method, the shaped steel formwork adopts the surrounding internal support system, and the steel pipe diagonal support is erected outside with the formwork support to offset the lateral pressure of concrete pouring.
In order to ensure the construction quality of caisson toilet during the construction of high-rise residence, Zhejiang Dongyang No.
At the same time, for the convenience of formwork removal, the bottom opening of the shaped steel formwork is retracted by 20mm to make the overall steel formwork inclined, as shown in the following figure.
A single caisson steel formwork can be equipped with a jacking part and a jack.
After concrete pouring, the formwork can be removed only when the concrete strength reaches more than 1.2MPa.
The practice of jacking parts is shown in the figure below.
2) Plane positioning: after the plane positioning review is completed, its plane position must be fixed to avoid deviation during concrete pouring.
Production of shaped steel formwork 1.
2.
Design of shaped steel formwork 1) recheck the size of each caisson toilet according to the engineering building and structural construction drawings to determine the size of shaped steel formwork.
Positioning of shaped steel formwork 1) elevation positioning: according to the elevation of the bottom of the hanging formwork in the toilet, the beam stirrups around the toilet are used for welding Φ 12 horizontal reinforcement (at least 2 on each side, and the horizontal reinforcement is required to exceed the beam edge control line by at least 50mm) as the bottom support of shaped steel formwork.
3.
Shaped steel formwork shall be manufactured according to the design drawings, and raw materials, components and accessories shall be purchased.
2.
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After many successful engineering practices, the technical, economic and social benefits are remarkable.
The construction process of the integral shaped steel formwork of the caisson in the toilet uses the characteristics of high surface flatness and high stiffness of the shaped steel formwork to make the integral hanging formwork of the caisson, and the concrete pouring achieves the effect of fair faced concrete with good forming quality.
Installation of shaped steel formwork 1.
Due to small stiffness, poor flatness and insufficient internal support strength, it is easy to cause quality problems such as poor forming size and structural leakage.
2.
The formwork removal sequence is to loosen first and then remove, jack up the jacking parts at the four corners of the shaped steel formwork one by one to completely separate the steel formwork from the concrete, and then lift the overall shaped steel formwork away from the operation layer by tower crane.
It will be used next time, with less processes, strong mechanized operability and high work efficiency.
has carefully analyzed and studied the caisson formwork support system of toilet, and formulated a complete construction technology of integral finalized steel formwork of toilet caisson.
Site examples: shaped steel formwork assembly, shaped steel formwork assembly, welding, weld grinding, jack up parts production, jack up parts installation, positioning bar welding, water stop screw fastener installation, external formwork reinforcement elevation, external formwork reinforcement facade Jack installation, shaped steel formwork jacking, shaped steel formwork hoisting, toilet caisson overall shaped steel formwork construction process implementation effect: large formwork stiffness and guaranteed forming size; Overall finalization, simple construction and high work efficiency; The concrete is solid inside and smooth outside without leakage.
Fix two water stop screw fasteners on the floor bottom formwork around the hanging formwork, and support the hanging formwork in four directions at the same time to fix it.
At the same time, the pull ring is used to fix the outrigger and set the jacking part.
The height of the shaped steel formwork should be 50mm higher than the height difference of the falling plate.
Support system the traditional wooden formwork support and reinforcement adopts the split bolt system.
Note that the main reinforcement or stirrup shall not be burned during spot welding.
After the removal of the shaped steel formwork, it shall be cleaned in time and painted with isolation agent for next use.
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