阅读说明：本技术 一种爪簧式双管取样钻具 (Claw spring type double-tube sampling drilling tool ) 是由 刘勤学 周兢 秦鹏 任晓飞 李永华 吴浩 陆卫星 张福海 田英材 于 2019-12-10 设计创作，主要内容包括：本发明提供了一种爪簧式双管取样钻具,包括外管、钻头、取样管和爪簧,所述钻头通过固定在外管的底部,钻头的中心具有贯通钻头上下表面的取样孔,取样管设置在外管的内部并且取样管的底部开口对准在钻头的取样孔上,取样管的底部开口处设置有避免样品掉落的爪簧。该取样钻具能够提高钻探效率,保证样品不脱落,适合于松软地层及砂层的取样。(The invention provides a claw spring type double-tube sampling drilling tool which comprises an outer tube, a drill bit, a sampling tube and a claw spring, wherein the drill bit is fixed at the bottom of the outer tube, the center of the drill bit is provided with a sampling hole penetrating through the upper surface and the lower surface of the drill bit, the sampling tube is arranged in the outer tube, the bottom opening of the sampling tube is aligned to the sampling hole of the drill bit, and the bottom opening of the sampling tube is provided with the claw spring for preventing a sample from falling. The sampling drilling tool can improve the drilling efficiency, ensures that the sample does not fall off, and is suitable for sampling of soft stratum and sand layer.)

1. The utility model provides a double-barrelled sample drilling tool of claw spring formula, includes outer tube, drill bit, sampling tube and claw spring, its characterized in that: the drill bit is through fixing in the bottom of outer tube, and the center of drill bit has the thief hole that link up the drill bit upper and lower surface, and the thief tube setting is in the inside of outer tube and the bottom opening of thief tube aims at on the thief hole of drill bit, and the bottom opening part of thief tube is provided with the claw spring of avoiding the sample to drop.

2. A jaw spring type double tube sampling drill as claimed in claim 1, wherein the jaw spring comprises an annular ring, a plurality of upwardly protruding jaw springs are provided on an upper surface of the annular ring around a circumference of the annular ring, and the jaw springs are bent toward a central axis of the annular ring at an upper portion of an upper surface of the annular ring.

3. A jaw spring type double tube sampling drill as claimed in claim 2, wherein the annular ring has an annular inner hole in the middle thereof, the inner diameter of the annular inner hole being equal to or larger than the sampling diameter of the drill bit.

4. A jaw spring type double tube sampling drill as claimed in claim 3, wherein the inner diameter of the annular inner bore is less than or equal to the inner diameter of the sampling tube.

5. The jaw spring type double-tube sampling drill as claimed in claim 2, wherein the jaw spring is disposed at the bottom opening of the sampling tube by means of screw, insertion or riveting.

6. A jaw spring type double tube sampling drill as claimed in claim 2, wherein the face of the jaw spring having the jaw spring plate is disposed on the side away from the drill bit.

7. The jaw spring type double tube sampling drill as set forth in claim 2, wherein the sampling tube is made of a transparent plastic tube.

8. A jaw spring type double tube sampling drill as claimed in claim 2, wherein the jaw spring is made of steel or plastic.

9. A jaw spring type double tube sampling drill according to claim 1, further comprising an inner tube positioned inside the outer tube and above the sampling tube.

10. A jaw spring type double tube sampling drill as claimed in claim 1, wherein the bottom end of the inner tube is connected to the upper end of the sampling tube by a sampling tube joint.

Technical Field

The invention relates to a sampling drilling tool, in particular to a sampling drilling tool suitable for loose soft stratum and sand layer

Background

At present, core tube (or semi-closed tube) drilling tools with step drill bits and bailing barrel drilling tools with hinge plate drill bits are adopted as common sampling drilling tools for loose soft stratum and sand layer under the condition of outer casing protection wall. The disadvantages of the outer sleeve retaining wall sampling are: the process is complicated, firstly the outer sleeve is put in, then the sampling drilling tool is put in the outer sleeve, then the outer sleeve is followed, then the sampling drilling tool is put in, and finally the outer sleeve is pulled out after the sampling drilling tool drills to the preset depth. The sampling drill also has the following disadvantages: 1) when a core tube (or semi-closed tube) drilling tool with a step drill bit is used for sampling a soft stratum and a sand layer, a sample is easy to enter, but the drill bit is not provided with a core protection device, so that the sample is easy to fall off when the drill bit is lifted, and the sampling cannot be performed. 2) When sampling in a soft stratum and a sand layer, a sand bailing barrel drilling tool with a hinge plate drill bit is easy to enter a sample, but is not easy to exit, and when the sample is withdrawn by hammering or water pressure, the integrity and continuity of the sample are damaged, and the stratum position where the sample is located cannot be accurately judged.

In view of the above-mentioned drawbacks, the present inventors have conducted extensive studies and practice to achieve the present method to solve the above-mentioned drawbacks.

Disclosure of Invention

In order to solve the problems in the background art, the invention provides a claw-spring type double-pipe sampling drilling tool which can improve the drilling efficiency, ensure that a sample does not fall off and is suitable for sampling a soft stratum and a sand layer.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a double-barrelled sample drilling tool of claw spring formula, includes outer tube, drill bit, sampling tube and claw spring, its characterized in that: the drill bit is through fixing in the bottom of outer tube, and the center of drill bit has the thief hole that link up the drill bit upper and lower surface, and the thief tube setting is in the inside of outer tube and the bottom opening of thief tube aims at on the thief hole of drill bit, and the bottom opening part of thief tube is provided with the claw spring of avoiding the sample to drop.

The claw spring comprises an annular ring, a plurality of claw spring pieces extending upwards are arranged on the upper surface of the annular ring around the circumference of the annular ring, and the claw spring pieces bend towards the central axis of the annular ring on the upper part of the upper surface of the annular ring.

The middle part of the annular ring is provided with an annular inner hole, and the inner diameter of the annular inner hole is equal to or larger than the sampling hole of the drill bit.

The inner diameter of the annular inner hole is smaller than or equal to the inner diameter of the sampling tube.

The claw spring is arranged at the bottom opening of the sampling tube in a threaded, inserted or riveted mode.

The side of the claw spring with the claw spring leaf is arranged on the side far away from the drill bit.

The sampling tube is made of transparent plastic tube.

The pawl spring is made of steel or plastic.

The sampling drilling tool also comprises an inner tube, wherein the inner tube is positioned inside the outer tube and above the sampling tube.

The bottom end of the inner tube is connected with the upper end of the sampling tube through a sampling tube joint.

The invention has the beneficial effects that: compared with a drilling method of casing pipe protecting walls, the method has the advantages that the inner and outer pipes are synchronously tracked, drilling procedures can be reduced, time is saved, labor intensity is reduced, and drilling efficiency is improved. The claw spring core protecting device can ensure that the sample does not fall off, and is suitable for sampling soft stratum and sand layer.

Drawings

The invention will be further explained with reference to the drawings

FIG. 1 is a schematic cross-sectional view of a sampling drill according to the present invention;

FIG. 2 is an elevation view of a pawl spring in the sample drilling tool of the present invention;

fig. 3 is a top view of a pawl spring in a sample drilling tool according to the present invention.

Detailed Description

The invention will be further described with reference to the following description and embodiments in conjunction with the accompanying drawings: