Construction method of movable formwork under large-span and small-curve-radius working condition
A technology of moving formwork and small curve, applied in the erection/assembly of bridges, bridges, buildings, etc., can solve the problems of reduced personnel and machinery use efficiency, difficult construction quality control, and large safety risks, so as to improve the safety factor and reduce costs. The effect of investing and improving the safety factor
Inactive Publication Date: 2014-03-12
THE THIRD ENG CO LTD OF THE HIGHWAY ENG BUREAU OF CCCC
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Problems solved by technology
[0002] During the construction of cast-in-place box girders with high piers on large bridges, especially in the construction of large-span and large-tonnage box girders, there are major safety and quality risks
[0003] In the past, the mobile formwork could not satisfy the construction of cast-in-place concrete bridges under the complex conditions of large span, small curve, and widening, and there were great safety risks in practical applications. Construction quality control is difficult, progress is slow, cost is high, and the efficiency of personnel and machinery is reduced
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[0040] Describe in detail below in conjunction with accompanying drawing:
[0041] The operation steps in the operation manual are as follows:
[0042] Do the first hole first ( figure 1 Assembling of mobile formwork and construction of box girder concrete pouring;
[0043] In the next step, after the construction of the first hole box girder is completed, the formwork is dropped, and the bottom formwork and the horizontal connection device of the bottom formwork truss are opened;
[0044] In the next step, install and precisely adjust the front and rear guide beam end connection parts to set a 3° angle device; ( figure 2 The guide beam and the main beam are in a straight line state, image 3 Install a wedge-shaped block adjustment device on the outer connection point of the guide beam, and the inner connection point is a pin connection that can be rotated to form a 3° angle)
[0045] Next, fold the bottom truss facility (eg Image 6 Open the bottom form truss connection...
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Provided is a construction method of a movable formwork under a large-span and small-curve-radius working condition. The construction method of the movable formwork under the large-span small-curve-radius working condition is characterized in that the movable formwork guide beam corner step includes that a corner device is arranged at the position of connection between a front guide beam end and a rear guide beam end; the bottom mould folding step includes that a folding device is arranged on a bottom mould, and 90-degree corner folding operation is achieved through a hydraulic high-pressure oil cylinder device; the bottom mould truss folding step includes that a folding device is arranged on a truss, and 180-degree corner folding operation is achieved through a hinge pin connecting device. When the construction method of the movable formwork under the large-span small-curve-radius working condition is adopted, on the premise that construction safety is ensured, the whole construction period of a project is shortened by 12%, and the construction cost is reduced by about 8%.
Description
technical field [0001] The invention relates to the construction of a box girder with a large span and a small curve radius by a hole-by-hole cast-in-place concrete mobile formwork method. Background technique [0002] In the construction process of cast-in-situ box girders with high piers on large bridges, especially in the construction of large-span and large-tonnage box girders, there are great hidden dangers in safety and quality. [0003] In the past, the mobile formwork could not satisfy the construction of cast-in-place concrete bridges under the specific conditions of large span, small curve, and widening complex conditions. In practical applications, there were large safety risks, difficult construction quality control, slow progress, high cost, and inefficient use of personnel and machinery. reduce. At present, due to the traffic demand of major cities in the construction of large bridges, it is more common to use the conventional mobile formwork method or the hig...
Claims
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IPC IPC(8): E01D21/06
Inventor 李文靳志强陈胜亮孙国一刘方华李庆华
Owner THE THIRD ENG CO LTD OF THE HIGHWAY ENG BUREAU OF CCCC