Method for accurately positioning anchorage bar of prefabricated assembled column foundation

Abstract

The invention discloses a method for accurately positioning an anchorage bar of a prefabricated assembled column foundation. The method comprises the following steps: sinking a bed course at a position corresponding to an embedded column anchorage bar by 300 to 350nm to form a pit, the bottom side length of the pit being 500mm larger than the side length of a column; after the bed course is poured, snapping a column bar sideline on concrete of the bed course; adopting a temporary fixing bracket for the embedded column anchorage bar, and regulating the position of the bracket to position the bar within a corresponding column bar sideline range; firmly jacking the temporary fixing bracket and the bed course on the edge of the pit, and regulating the perpendicularity of the column bar through a diagonal bar; pouring concrete in the pit to be flush with the top surface of the originally designed bed course in an early stage, and after the concrete of the part has certain strength, removing the temporary fixing bracket; binding a foundation bottom plate bar, arranging a bar positioning plate again, and erecting a foundation bottom plate groove template; after foundation concrete is poured and reaches certain strength, removing the groove template. According to the method, construction is facilitated, and the positioning accuracy is ensured.

Description

Technical field [0001] The invention relates to a method for accurately positioning anchoring steel bars of a prefabricated assembly column foundation. Background technique [0002] In prefabricated concrete structures, the connection between large prefabricated concrete columns and the foundation usually adopts pre-embedded anchor steel bars in the foundation concrete. The specifications, quantities, and relative positions of the prefabricated concrete columns match the prefabricated reinforced grout anchor connecting sleeves. The hole diameter of the reserved grout anchor sleeve in the column is only 14~17mm larger than the diameter of the reserved anchor steel bar of the foundation, and the length of the reserved anchor steel bar extending from the top surface of the foundation is 8d+20mm (d steel bar diameter). The 16~32 reinforced grout anchor connecting sleeves correspond to the embedded anchoring steel bars in the foundation one-to-one. When one of the foundation anchoring...

AI Technical Summary

Problems solved by technology

According to the completed engineering survey data, the deviation rate of pre-embedded anchor bars in the foundation is about 0.5%~0.8% based on the number of steel bars in the column, but about 20% based on the number of columns. %~25%, resulting in a large number of prefabricated columns that cannot be installed directly, and other correction or reinforcement measures need to be taken, resulting in huge economic losses and delays in the construction period, and the quality of the project is also damaged to a certain extent

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