Rotary excavating drilling machine squeezing hole-forming construction technique

Abstract

The invention belongs to the technical field of building construction and particularly discloses a rotary excavating drilling machine squeezing hole-forming construction technique. The rotary excavating drilling machine squeezing hole-forming construction technique comprises the following steps that (1), construction preparation is conducted; (2), pile position setting out is conducted; (3), a rotary excavating drilling machine is in place, and a drill bit slowly touch downs the ground and rotates to conduct drilling; (4), when the drill bit of the rotary excavating drilling machine penetratesthrough a soft layer section, a drill bit special for squeezing hole forming is replaced and mounted to slowly conduct drilling; (5), in the drilling process, drilling resistance is obviously increased, the drilling speed is lower than 0.1 m / min, a drilling rod of the rotary excavating drilling machine is reversely rotated to evenly and slowly lift the drill bit special for squeezing hole forming, and the lifting speed is well controlled according to the torque; and (6), when hole collapse occurs in the hole forming process, the hole collapse position is backfilled with clay, and the drill bit special for squeezing hole forming is driven through the rotary excavating drilling machine to conduct drilling again to squeeze the clay to the periphery of a hole to form a compact and stable protection wall. Through the construction technology, the hole collapse risk can be reduced, even if hole collapse occurs, remediation can also be rapidly conducted, and the construction progress is prevented from being affected.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a construction technique for forming holes by extruding a rotary drilling rig. Background technique [0002] Rotary drilling rig is a construction machine suitable for hole-forming operations in building foundation engineering. It is mainly suitable for the construction of sandy soil, cohesive soil, silty soil and other soil layers. It is widely used in various foundation constructions such as cast-in-place piles, diaphragm walls, and foundation reinforcement. The rated power of rotary drilling rigs is generally 125-450kW, and the power The output torque is 120-400kN m, the maximum hole diameter can reach 1.5-4m, and the maximum hole depth is 60-90m, which can meet the requirements of various large-scale foundation construction. [0003] The working principle of the existing rotary drilling rig drilling is: the power head device of the drilling rig prov...

AI Technical Summary

Problems solved by technology

However, when drilling with this technology, it is very easy to collapse the hole when it encounters a soft soil layer or a poorly graded gravel layer. To deal with the collapsed hole, steel casing or concrete refilling scheme is often used, whether steel casing or concrete is used. The remedial schemes for concrete refilling all have the problems of high cost and serious impact on the construction progress

The hole-forming process of screw piles can solve the problem of hole collapse that is easy to occur when encountering soft soil layers or poorly-graded gravel layers to a certain extent, but the diameter of the holes formed by this process is much smaller than that of rotary excavation. Many, and the equipment used in this process is a long auger drilling rig with low power, long auger pipe, and low hole-forming efficiency in the rock-socketed section

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