Special-shaped guide combined hammer for dynamic compaction

Abstract

The special-shaped guide combined hammer comprises a basic rammer and a guide rammer, the basic rammer is in a convex shape, the bottom of the basic rammer is a cylindrical hammer body, a vertically-extending hammer neck is integrally arranged in the middle of the top end of the hammer body of the basic rammer, and a plurality of vertically-through exhaust holes are formed in the portion, on the outer side of the hammer neck, of the hammer body of the basic rammer according to an annular array; the hammer neck is cylindrical, the axis of the hammer neck and the axis of the hammer body are collinear, the center position of the top of the hammer neck is in threaded connection with a mushroom head hoisting screw which is coaxially arranged with the hammer neck, and the bottom end of the mushroom head hoisting screw penetrates through the hammer neck and extends to a certain depth in the hammer body; the top end of the base rammer body is fixedly connected to the center of the bottom end of the base rammer body, the axis of the base rammer body is collinear with the axis of the rammer body, and the cross section size of the base rammer body is smaller than that of the rammer body and larger than that of the rammer neck. The displacement depth can be greatly increased, positioning is accurate, the situation that a construction hammer body absorbs and tilts is not likely to happen, and the purposes of quality improvement and efficiency improvement are achieved.

Description

technical field [0001] The invention relates to the field of dynamic compaction construction equipment, in particular to a special-shaped guide combined hammer for dynamic compaction. Background technique [0002] The dynamic compaction replacement foundation treatment construction method has the advantages of fast processing speed, low cost and wide influence range, but the dynamic compaction construction also has shortcomings. For example, the foundation soil is highly sensitive silty clay. The depth of the dynamic ramming replacement pier is often not guaranteed. The traditional rammer has a large bottom area and a small bottom area (mainly conical or truncated). When it is a large bottom area rammer, under the condition of the same hammer weight, the larger the bottom area of ​​the hammer, the larger the unit area. The smaller the ramming force received by the foundation, the more difficult it is for the replacement pier body material to penetrate into the foundation, r...

AI Technical Summary

Problems solved by technology

[0002] The dynamic compaction replacement foundation treatment construction method has the advantages of fast processing speed, low cost, and wide impact range, but the dynamic compaction construction also has shortcomings. For example, when the local foundation soil is highly sensitive silty clay with high moisture content, the existing rammer The depth of the pier replaced by dynamic compaction is often not guaranteed

The traditional rammer has a large bottom area and a small bottom area (mainly conical or truncated cone). When it is a large bottom area rammer, under the same hammer weight, the larger the hammer bottom area per unit area The smaller the tamping force on the foundation, the more difficult it is for the replacement pier material to penetrate into the foundation, resulting in insufficient replacement depth of the pier body. When it is a rammer with a small bottom area, in order to ensure that the weight of the hammer remains unchanged, the height of the hammer body will increase accordingly. As a result, the drop distance is reduced, and the bottom area is too small, which is easy to cause hole collapse, and the effect of dynamic compaction is not ideal

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