Rotary excavating drilling machine squeezing hole-forming construction technique

A technology of rotary drilling rig and construction technology, which is applied in the direction of drill bit, drilling equipment, directional drilling, etc. It can solve the problems of low hole formation efficiency in rock-socketed sections, influence on construction progress, and easy hole collapse, so as to reduce the risk of hole collapse , Save construction cost, reduce the effect of construction cost

Active Publication Date: 2018-03-27
CHONGQING HUASHUO CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Rotary excavating drilling machine squeezing hole-forming construction technique

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Effect test

Embodiment 1

[0028] A rotary drilling rig extrusion hole construction process, comprising the following steps:

[0029] (1) Construction preparation: Prepare a rotary drilling rig that matches the hole depth and pile diameter, a drill bit for the rotary drilling rig that is the same as the designed pile diameter, and a special drill bit for extrusion drilling, and clay with a moisture content of 12-15% , if there is a soil layer with very poor gradation and serious lack of fine bone filler according to the analysis of the geological survey report, suitable clay can be prepared according to the test pile. Such as figure 1 As shown, from top to bottom, the special drill bit for extruding holes includes a reverse conical slag discharge cylinder 4, an anti-deflection drill body 3, and a conical extrusion cylinder 1 with a large upper part and a smaller lower one. The side wall of the anti-deflection drill body 3 is provided with The wear-resistant material layer 9 and the conical extruding cy...

Embodiment 2

[0037] The difference between embodiment 2 and embodiment 1 is that in embodiment 2, the anti-deflection drill body 3 of the special drill bit for extruding into holes is provided with a through hole that runs through the diameter of the anti-deflection drill body, and a pressure rod is fixed in the through hole. Both ends of the rod protrude from the anti-deflection drill body and the protruding length can be adjusted. The pressing rod includes sleeves respectively fixed on both sides of the through hole and sliding rods slidably connected in the sleeve and the through hole, and the lengths of the two sliding rods protruding from the sleeve are equal. The sleeve is provided with a plurality of limit holes, and the slide bar is provided with a plurality of jacks matched with the limit holes, and the slide bar can be fixed by passing through the limit holes and the jacks successively by means of bolts and other fixing parts. Adjust the length of the pressing rod according to th...

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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...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B10/42E21B10/44E21B10/46
CPCE21B7/04E21B10/42E21B10/44E21B10/46
Inventor 李伯勋
Owner CHONGQING HUASHUO CONSTR
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