Rectangular cast-in-place pile slotting combined drilling rig

Abstract

The invention discloses a rectangular cats-in-place pile slotting combined drilling rig. The drilling rig comprises an under water rig, a cage type combined drill which is arranged at the lower end of the under water rig, and a spray guide pipe which is arranged on one side of the under water rig; the spray guide pipe is connected with a rack; and the upper end of the under water rig is connected with the rack through a steel rope. According to the drilling rig, the cage type combined drill cuts a soil body from top to bottom, holes are formed primarily by using slot correction devices of the fixed under water rig, and the all-section overlapped slot position correction is performed by using a special rectangular section smasher, so the hole forming of a rectangular cast-in-place pile is finished well. A reinforcement cage can be placed smoothly, a section is excavated after construction, and a pile has a good shape. A spray guide pipe process air lift reverse circulation deslagging method is adopted, and an obvious deslagging effect and a slurry changing effect are achieved; and pile verticality is 1 / 300 required by the design.

Description

technical field [0001] The invention relates to a cast-in-place pile grooving machine tool, in particular to a rectangular cast-in-situ pile grooving combined drilling tool. Background technique [0002] Compared with the circular cast-in-place pile with the same cross-section, the bearing capacity of the friction pile with the same amount of concrete is increased by more than 16% for the rectangular cast-in-place pile. In addition, the rectangular cast-in-situ pile can fully exert the tensile stress of the steel bar in the concrete section and save the amount of steel bar. When the same amount of steel is used, the horizontal bending resistance of the pile body is high. With the continuous maturity of the construction technology of rectangular cast-in-place piles, more and more design units use rectangular cast-in-place piles as pile foundations or form curtain structures in the design of wharfs and municipal engineering. Various construction techniques of rectangular cast...

AI Technical Summary

Problems solved by technology

This process mainly has the disadvantages of slow construction speed and difficulty in pressing down the steel cage, especially the current pile foundation construction size section is getting larger and deeper, and the adaptability of this construction process is not strong.

[0005] The construction of hydraulic grab adopts direct grabbing into groove construction, the main problem and disadvantage is that the adaptability to the interface size of rectangular cast-in-situ piles is not strong

It is very uneconomical to have a new set of buckets and guide plates for a rectangular cast-in-place pile with a cross-sectional size

In addition, due to the one-grab construction of the hydraulic grab, if the verticality is not well controlled, it will be difficult to lift the bucket body up and down, which will cause the aperture to continuously enlarge, and in severe cases, machine damage such as buried buckets will occur

[0006] The main problem in the construction of rectangular sections by rotary drilling and row drilling is that the section is not well adaptable. When the aspect ratio of the section of rectangular cast-in-situ piles is less than 2, rotary drilling can only be used for single-hole construction, and other soil extraction techniques are still required for the remaining soil at the pile site. In addition, the verticality of the groove formed by the rotary drill can not meet the design requirements of 1 / 300

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