Composite protection quick hole forming method for near-subway viaduct pile foundation

Abstract

The invention discloses a composite protection quick hole forming method for a near-subway viaduct pile foundation. The composite protection quick hole forming method comprises the steps of survey andsetting-out, drilling, mud treatment center building, cement-mixed pile reinforcing, permanent steel casing burying, final hole forming and hole cleaning, reinforcement cage machining and placing, underwater concrete pouring and the like. The composite protection method of cement-mixed piles, permanent steel casings and thick mud combined is adopted for solving the problem of small clear distancebetween subway tunnels, it is ensured that the near-subway pile foundation is constructed stably, the disturbance to a subway structure is reduced greatly, the great protection effect is achieved, and the construction quality and safety are guaranteed.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a rapid hole-forming method for composite protection of pile foundations adjacent to subway viaducts. Background technique [0002] Pile foundation refers to a deep foundation composed of piles and pile caps connected to the top of the piles or a single pile foundation connected by columns and pile foundations. The pile foundation construction of bridges is the most important link in every bridge construction, and the construction includes processes such as measuring and setting out casings, burying bored reinforcement cages, and lowering cast-in-place piles. [0003] However, for some pile foundations in special locations, the pile foundation is close to the subway and the carriageway, and the pile foundation of the existing subway bridge is constructed. Since the pile foundation of the main line bridge is relatively close to the subway tunnel, the theoretical minimum clear dis...

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Problems solved by technology

[0006] It can be seen from the above scheme that the present invention aims at the problem of the small net distance of the subway tunnel, and adopts the composite protection method of "cement mixing pile + permanent steel casing + thick mud" to ensure the stability of the pile foundation construction near the subway, and the cement mixing pile Improve the construction soil quality in the opening stage and the initial stage of drilling with the drilling rig, and strengthen and protect the soil around the pile foundation. The permanent steel casing is to strengthen and protect the subsequent pile foundation hole cleaning and pouring and superstructure construction. Establish a mud treatment center to realize the recycling of mud. The mud retaining wall set up runs through the entire hole-forming process, which not only saves material costs, but also better protects the environment, ensures the stability of the surrounding soil in the early stage of pile foundation drilling, and greatly reduces damage to The disturbance of the subway structure plays a very good protective role to ensure the construction quality and safety

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