Socketed pile thread-like steel protecting cylinder capable of being drilled and using method thereof

Abstract

The invention provides a socketed pile thread-like steel protecting cylinder capable of being drilled and a using method thereof. The steel protecting cylinder comprises a middle section, a drive section, a drill bit section and a thread section, wherein the drill bit section and the thread section can be embedded into a rock-soil body. At least three high-strength alloy block bodies are arranged on the outer periphery wall of the drill bit section. Helical blades I are further arranged on the outer periphery wall of the drill bit section. In the working process, the drive section, the middle section, the thread section and the drill bit section are sequentially arranged from top to bottom. The bottom face of the thread section is fixedly connected with the top face of the drill bit section. The bottom face of the middle section is fixedly connected with the top face of the thread section. The bottom face of the drive section is fixedly connected with the top face of the middle section. The using method of the steel protecting cylinder comprises the steps of assembling the steel protecting cylinder, locating the steel protecting cylinder, sinking the steel protecting cylinder, excavating a pile hole, clearing the hole and the like. The steel protecting cylinder solves the problems that due to the fact that the rock-in depth is too shallow, concrete overflows, and stress on a pile body at the bottom end of the steel protecting cylinder is concentrative, and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of rock-socketed pile construction, in particular to a threaded steel casing for drillable rock-socketed piles. Background technique [0002] In the construction of underwater reinforced concrete rock-socketed piles, steel casings are often used as construction auxiliary facilities. After the piles are completed, the steel casings are not removed due to various reasons, but are retained as part of the rock-socketed pile body and combined with the Reinforced concrete piles share the external load. The pile body of this rock-socketed pile is also called steel casing rock-socketed pile because of the steel casing. [0003] The method of using the steel casing in the construction of underwater rock-socketed piles is usually as follows: first use the constructed construction platform on the water to vertically position the steel casing so that the steel casing is aligned with the rock-socketed pile to be constructed, and t...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the advantages of the steel casing in the construction of underwater rock-socketed piles are outstanding, but its shortcomings cannot be ignored. The shortcomings are mainly reflected in two aspects: first, the driving force of the steel casing sinking into the foundation It is the self-weight of the steel casing and the vertical static or dynamic load applied to the top of the steel casing. Under the action of this driving force, the steel casing can usually penetrate the soil foundation, but the depth into the rock foundation is very limited, making the steel casing The bottom end of the barrel cannot effectively enter the rock-socketed section of the rock-socketed pile

This may have a negative impact on the construction quality of the rock-socketed pile and the bearing capacity after the pile is formed, because the concrete poured during construction may overflow from the bottom of the steel casing and affect the construction quality; Due to the sudden change of pile modulus, there may be stress concentration, especially under the action of horizontal external load, there may be a risk of transverse cracking or even pile breakage

Second, during the sinking process of the steel casing, when it encounters a steep bedrock surface, bedrock layer or structural surface, the steel casing may slip sideways

As long as the thickness of the filled soil is large enough, this method can solve the above-mentioned problems such as the side slip and tilt of the steel casing, and the overflow of concrete, but it cannot effectively reduce or eliminate the shallow depth of the steel casing entering the bedrock under the action of horizontal external loads. At the same time, when the original ground is a slope, the stability of the newly filled soil and its adverse effects on the rock-socketed piles have become new problems that must be solved

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