Concrete piling process and drilling machine special for same

Abstract

The invention discloses a concrete piling process and a drilling machine special for the same. The concrete piling process is applicable to filled concrete and fluid such as cement, and can meet construction requirements of complicated geological conditions comprising high hardness or high collapsibility; by the concrete piling process, drilling, filling and broaching are completed at a time, and diameter-varied piles with high quality requirements can be molded; and transverse drilling can be realized at any position of pile holes accurately; the concrete piling process is convenient to construct and high in reliability; and the drilling machine special for the concrete piling process can meet requirements of a construction process, effectively shorten construction periods and accurately position the pile holes and determine the depths of the pile holes, and is reasonable in structure, high in strength and long in service life.

Description

technical field [0001] The invention relates to a pile-forming process and special equipment, in particular to a concrete pile-forming process and a special drilling rig. Background technique [0002] The existing cast-in-place piles include vibrating sinking pipe cast-in-place piles, mud wall retaining cast-in-place piles, and auger-drilled sandless concrete cast-in-place piles. [0003] The construction technology of vibrating sinking pipe grouting pile is as follows: 1. Start the vibrating hammer to sink the pile pipe to the design depth; 2. Lower the reinforcement cage to the design elevation in the pile pipe; 3. Putting concrete into the pile pipe; 4. Extubation into a pile. The disadvantage is that when the ground soil layer contains a thicker sand layer, the vibrating immersed tube cannot pass through the sand layer; and the vibratory hammer has a large power and is located on the top of the pile pipe, so there is a lot of noise during construction, and constructi...

AI Technical Summary

Problems solved by technology

[0016] This structure satisfies the function of increasing the cross-sectional area of ​​the bottom of the pile body. Compared with the straight pile, it can make the pile body firmer, but there are some shortcomings due to structural reasons: 1. The oil cylinder is set in the steel pipe, so only cement or For the filling of other fluid slurry, if the concrete slurry is filled, the concrete is difficult to pass through, then after the filled concrete slurry enters the steel pipe, the oil cylinder cannot expand outward due to the existence of sand and gravel, and the oil cylinder is filling the concrete slurry. 2. When the drill bit is drilling down, mud and sand are easy to enter the steel pipe, blocking the whereabouts of the cement slurry and making it impossible to pour; 3. The drill bit for bottom expansion is two pieces Since it is only supported and driven by the working oil cylinder without other fixing measures, it is obvious that the strength of its structure can only be applied and constructed in soft soil environments, and it is difficult to use in hard soil or geological environments. If used, it is very easy to damage, and cannot guarantee the normal operation requirements of the construction

[0019] However, this process has some defects. 1. The expansion cutter is set at the position of the outer helical blade of the drill pipe. In this way, when drilling, because there is no protection measure for the expansion cutter, the expansion cutter is very easy to damage, especially in poor geological conditions. Next, 2. In addition, only the upper part of the working cylinder is used to pull the pull rod, which requires a higher working strength, because materials including soil, sand, etc. are filled in the pile holes formed by the spiral blades, how to ensure the pulling of the pull rod is a problem ;3. The way of setting the expansion knife in the slideway determines that the length of the expansion knife cannot be too long, that is to say, it is impossible or difficult to extend the length of the expansion knife beyond the distance between the pull rod and the outer diameter of the spiral blade, and the expansion knife It is also not easy to be too large in size, so the size of the expanded reaming hole includes small height and depth, and it is difficult to make a larger reaming hole. Compared with straight piles, it is difficult to make a major breakthrough in other indicators such as the firmness of the pile body

4. This structural form is difficult to guarantee and realize in practice due to the complexity of the ground conditions. It is difficult to guarantee the structural strength of the slideway set on the drill pipe, and it is also difficult to ensure that the slideway will not be blocked. Only the form of tie rods and hinged rods Its strength is difficult to guarantee to meet the needs of construction. If it encounters hard ground conditions, because the reaming tool needs to be rotated and reamed in the horizontal state when it is rotated horizontally, the slideway must bear the force of the reamer’s horizontal drilling, so the slideway The bonding strength with the drill pipe is difficult to meet the construction requirements, and the bottom of the tie rod is equipped with a spring device. This method is difficult to use normally when the material is blocked, and it is only an ideal situation.

5. This process only drills holes in the middle position, not at the bottom

6. This process can only carry out horizontal reaming when drilling to the bottom, but when the drilling is completed, concrete is filled at the same time when the drill pipe is lifted. At this time, the reaming tool needs to be retracted. The drilled material is full, so these materials are very easy to block the horizontal drilling, and it is impossible to effectively realize the filling of concrete to form special-shaped piles

[0020] Multiple groups of reaming cutters are reaming at the same time, and fixed-point reaming cannot be performed on the pile hole. Often, there is no reaming at the design position, but the phenomenon of reaming at other positions occurs; the reaming cannot be performed accurately, and the size of the reaming is not large. easy to grasp

[0021] It is not possible to pour concrete into the horizontal reaming hole. The drill pipe must be raised before the concrete pouring can be carried out on the lateral reaming hole. For the terrain with groundwater or easy hole collapse, it is impossible to construct

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