Construction method of steel pipe concrete column

A technology for concrete-filled steel tubular columns and construction methods, which is applied to columns, piers, pillars, etc., can solve the problems of high pressure requirements of conveying pumps, large one-time pouring height, affecting concrete quality, etc., and achieves small shrinkage gap and quality assurance. , the effect of easy material processing

Inactive Publication Date: 2008-12-10
DALIAN SANCHUAN CONSTR GROUP
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AI-Extracted Technical Summary

Problems solved by technology

The main problems are: for concrete filled steel tubes with large diameter and high pouring height, the one-time pouring height is very large, and the concrete’s own weight is also large, which requires a high pressure on the delivery pump; and once the pouring is interrupted in an emergency, it will Can't continue and po...
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Abstract

The invention relates to the building field. The invention relates to a construction method for a concrete filled steel tubular column, comprising the following steps that: a tube is filled with water at first, and then a tremie is put down to the bottom of a pile; concrete is poured into the steel tube by a hopper through the tremie, and a vibrating tamper which is attached to the outerwall of the tube performs concrete vibrating when placing is performed simultaneously; primary concrete placing is performed until the height is 3 to 5 meters on the upper side of a nozzle of the tremie, and the tremie is lifted and guaranteed that the embedding depth of the tremie in concrete is not less than 2 meters; secondary concrete placing is performed, and the vibrating tamper which is attached to the outside of the tube on the bottom layer is started; lifting and placing are repeated, and the concrete is placed to the top of the column; and laitance is removed. The construction method solves the problem of the separation phenomenon caused by overhigh concrete placing height, increases the compactness of the concrete, reduces the number of air bubbles, has small shrinkage clearance between the concrete and the steel tube, can well give play to the function of stress, is convenient in construction, is mechanized, and is simple and convenient in operation. Moreover, the quality can be guaranteed; the equipment is saved by 30 percent; the stability is strong; and 50 percent of raw steel materials and 35 percent of the concrete are saved when the steel tube and the concrete are under same stress, thereby the production cost is effectively reduced.

Application Domain

Technology Topic

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  • Construction method of steel pipe concrete column

Examples

  • Experimental program(2)

Example Embodiment

[0015] Example 1
[0016] Press as figure 1 The process flow shown is used for the construction of concrete-filled steel tube columns, using 35-meter-high limb concrete-filled steel tubes to be poured diagonally. After the steel tube piles are installed and the strength of the foundation concrete reaches 75%, water pumps are used to fill the steel tubes with water . use The steel pipe is 2 meters as a section, threaded connection, the middle is slip knot, the pipe is made, and the made pipe is inserted into the steel pipe, 600mm from the bottom of the pipe, and after the concrete strength of the filling cup reaches 75%, the hopper is used for concrete pouring, and water is used. The pressure reduces the falling speed of the concrete, and the pipe is poured 3 meters above the pipe at a time, and the pipe is lifted, and the pipe is buried in the concrete not less than 2 meters, and the second concrete pouring is performed. Start the bottom pipe external vibrator, the working range is effective when the steel pipe transverse amplitude is not less than 0.3mm, and the vibrating time is not less than 1 minute. The height of each subsequent watering is controlled at 2-3 meters. Repeat in sequence, without stopping during the pouring process, pouring the concrete to the top of the column, and removing the floating slurry. The invention avoids the concrete segregation caused by the concrete falling too fast, the concrete is compacted by gravity, and the vibration of the external attached vibrator ensures the compactness of the concrete.
[0017] 28 days after the completion of the concrete pouring, the steel pipe is cut, and the test block is taken for strength demonstration and compactness inspection. Appearance quality: The concrete has good compactness, no honeycomb phenomenon is found, and there are very few small bubbles; the concrete strength reaches C40, and the pouring quality meets the requirements.

Example Embodiment

[0018] Example 2
[0019] After the steel pipe pile is installed, use a water pump to fill the steel pipe with water. The pipe connected to the bottom of the hopper is inserted into the steel pipe, 600mm away from the bottom of the steel pipe. After the concrete strength of the filling cup reaches 75%, the hopper is used for concrete pouring. The pipe lifting should be slowly increased according to the falling speed of the concrete, and the lifting of the pipe should be controlled by the amount of concrete. Speed, concrete vibrating: After the first pouring, the concrete is buried 2 meters into the pipe, and the attached vibrator is activated. The vibrating time should be controlled within 1 minute to prevent excessive vibrating from causing segregation of the concrete. The main function of vibrating is to compact the concrete and reduce air bubbles in the concrete. Repeated in sequence, without stopping during the pouring process, the concrete was poured to the top of the column, the laitance was removed, the construction water poured in the column was drained because the cement mixed with the cement needs to be treated before it can be used and treated, and the water discharged from the drain hole is concentratedly discharged. After the sedimentation tank, the upper part of the sedimentation is used as construction water, and the lower sedimentation cement slurry is pulled by the pump truck to the sewage treatment plant for treatment. Avoid secondary pollution to the environment.
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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