阅读说明：本技术 一种水泥土双向搅拌桩钻进切削装置及钻进方法 (Drilling and cutting device and drilling method for cement soil bidirectional mixing pile ) 是由 杨立 汪明 于安文 宋平 崔玉峰 段李刚 柳明 张志鹏 廖文鑫 胥鹏伟 王尽峰 于 2021-08-23 设计创作，主要内容包括：本发明属于地质施工技术领域,具体涉及一种特殊地层下水泥土双向搅拌桩钻进切削装置及钻进方法。涉及的一种特殊地层下水泥土双向搅拌桩钻进切削装置,切削装置具有连接一体的上钻杆和下钻杆；所述的上钻杆上设置有一组水平叶片；其特征在于：所述的下钻杆上设置有上下两组叶片,其中位于下钻杆上部的一组叶片为水平叶片；位于下钻杆下部的一组叶片的叶片为倾斜叶片,且所述倾斜叶片由与下钻杆连接的一端向下倾斜设置；所述的倾斜叶片上设有刀刃,并在所述刀刃下缘设有梳齿孔。本发明解决了切削土体困难,切削不均匀的问题；利用叶片倾斜设置,实现了钻进全覆盖切削,解决了水平叶片只能水平切削,存在切土盲区问题。(The invention belongs to the technical field of geological construction, and particularly relates to a drilling and cutting device and a drilling method for a special underground soil bidirectional stirring pile. The cutting device is provided with an upper drill rod and a lower drill rod which are connected into a whole; a group of horizontal blades is arranged on the upper drill rod; the method is characterized in that: the lower drill rod is provided with an upper group of blades and a lower group of blades, wherein one group of blades positioned on the upper part of the lower drill rod are horizontal blades; the blades of one group of blades positioned at the lower part of the lower drilling rod are inclined blades, and the inclined blades are arranged in a manner that one end connected with the lower drilling rod is inclined downwards; the inclined blades are provided with blades, and comb tooth holes are formed in the lower edges of the blades. The invention solves the problems of difficult soil cutting and uneven cutting; the blade is arranged in an inclined mode, drilling full-coverage cutting is achieved, and the problem that horizontal blades can only cut horizontally and soil cutting blind areas exist is solved.)

1. A bidirectional stirring pile drilling cutting device for soil under water in a special stratum is provided with an upper drill rod and a lower drill rod which are connected into a whole; a group of horizontal blades is arranged on the upper drill rod; the lower drill rod is provided with an upper group of blades and a lower group of blades, wherein one group of blades positioned on the upper part of the lower drill rod are horizontal blades; the method is characterized in that: the blades of one group of blades positioned at the lower part of the lower drilling rod are inclined blades, and the inclined blades are arranged in a manner that one end connected with the lower drilling rod is inclined downwards; the inclined blades are provided with blades, and comb tooth holes are formed in the lower edges of the blades.

2. The special underground cement bidirectional stirring pile drilling and cutting device as claimed in claim 1, wherein: the included angle between one group of the inclined blades at the lower part of the lower drill rod and the horizontal plane is 30 degrees.

3. The special underground cement bidirectional stirring pile drilling and cutting device as claimed in claim 1, wherein: and the lower drill rod is provided with a guniting hole, and the guniting hole is positioned below the group of inclined blades at the lower part of the lower drill rod.

4. A method for drilling by using the cement soil bidirectional mixing pile drilling and cutting device as claimed in any one of claims 1 to 3, wherein: the drilling method specifically comprises the following steps:

step 1: knocking off the horizontal blade with poor cutting capability at the lower end of the original cement mixing pile foundation;

step 2: the cutting blade with the comb-tooth hole and the included angle of 30 degrees with the horizontal plane is welded with the lower end drill rod, and the blade is clockwise during welding;

and step 3: starting equipment, under the drive of a power device, in the process of drilling down, a lower drill rod rotates clockwise and sprays slurry through a slurry spraying hole, an upper drill rod rotates anticlockwise, and the upper drill rod and the lower drill rod stir soil bodies clockwise and anticlockwise while spraying slurry. After the pile is drilled to the designed pile length, spraying and stirring in situ for 30s, and stopping;

and 4, step 4: and when the drill is lifted, the lower drill rod rotates anticlockwise for stirring, and the upper drill rod rotates clockwise for stirring, so that the construction of the stirring pile is completed.

Technical Field

The invention belongs to the technical field of geological construction, and particularly relates to a drilling and cutting device and a drilling method for a cement soil bidirectional mixing pile.

Background

The cement soil bidirectional mixing pile drilling machine realizes soil cutting, guniting and mixing by utilizing forward and reverse rotation of an upper drill rod and a lower drill rod. The drill rod is divided into an upper drill rod and a lower drill rod, 1 group of 2 blades are welded on the upper drill rod, 2 groups of 4 blades are welded on the lower drill rod, and the vertical distance between the 2 groups of blades on the lower drill rod is 50 cm. All the blades are welded to be 1cm in thickness, and every two adjacent blades are arranged in a staggered mode at equal intervals on the plane, so that the uniform soil cutting and stirring are achieved.

The general stratum is relatively soft, and 3 groups of blades are all horizontal, can realize quick operation. However, in a special hard soil layer, the horizontal blades obviously slow down the soil body cutting speed, the drilling is difficult, the construction current is increased, the soil block cutting is not uniform, the guniting and stirring effects are poor, and the bearing effect of the stirring pile body is poor.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a drilling and cutting device and a drilling method for a cement soil bidirectional mixing pile.

The invention adopts the following technical scheme for achieving the purpose:

a bidirectional stirring pile drilling cutting device for soil under water in a special stratum is provided with an upper drill rod and a lower drill rod which are connected into a whole; a group of horizontal blades is arranged on the upper drill rod; the lower drill rod is provided with an upper group of blades and a lower group of blades, wherein one group of blades positioned on the upper part of the lower drill rod are horizontal blades; the blades of one group of blades positioned at the lower part of the lower drilling rod are inclined blades, and the inclined blades are arranged in a manner that one end connected with the lower drilling rod is inclined downwards; the inclined blades are provided with blades, and comb tooth holes are formed in the lower edges of the blades.

The included angle between a group of blades at the lower part of the lower drilling rod and the horizontal plane is 30 degrees.

And the lower drill rod is provided with a guniting hole, and the guniting hole is positioned below the group of inclined blades at the lower part of the lower drill rod.

The drilling method by using the cement soil bidirectional mixing pile drilling and cutting device specifically comprises the following steps:

step 1: knocking off the horizontal blade with poor cutting capability at the lower end of the original cement mixing pile foundation;

step 2: the cutting blade with the comb-tooth hole and the included angle of 30 degrees with the horizontal plane is welded with the lower end drill rod, and the blade is clockwise during welding;

and step 3: starting equipment, under the drive of a power device, in the process of drilling down, a lower drill rod rotates clockwise and sprays slurry through a slurry spraying hole, an upper drill rod rotates anticlockwise, and the upper drill rod and the lower drill rod stir soil bodies clockwise and anticlockwise while spraying slurry. After the pile is drilled to the designed pile length, spraying and stirring in situ for 30s, and stopping;

and 4, step 4: and when the drill is lifted, the lower drill rod rotates anticlockwise for stirring, and the upper drill rod rotates clockwise for stirring, so that the construction of the stirring pile is completed.

According to the drilling and cutting device and the drilling method for the special underground cement bidirectional stirring pile, the technical scheme is adopted, and the problems of difficulty in cutting soil and non-uniform cutting are solved; the blade is arranged in an inclined mode, drilling full-coverage cutting is achieved, and the problem that horizontal blades can only cut horizontally and soil cutting blind areas exist is solved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic view of the construction of the pitched blade of the present invention.

In the figure: 1. the method comprises the following steps of (1) feeding a drill rod, (2) a horizontal blade, (3) an inclined blade, (4) a comb tooth hole, (5) a guniting hole and (6) feeding a drill rod.

Detailed Description

The invention is described in detail with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1 and 2, the cutting device for drilling the special underground cement bidirectional mixing pile comprises an upper drill rod 1 and a lower drill rod 6 which are connected into a whole; a group of horizontal blades 2 are arranged on the upper drill rod 1; the group of horizontal blades are uniformly distributed along the circumference of the upper drill rod 1; the lower drill rod 6 is provided with an upper group of blades and a lower group of blades, wherein one group of blades positioned on the upper part of the lower drill rod is a horizontal blade 2; the blades of one group of blades positioned at the lower part of the lower drill rod are inclined blades 3, and one end of each inclined blade 3 connected with the lower drill rod 6 is inclined downwards; the inclined blades 3 are provided with blades, and the lower edges of the blades are provided with comb teeth holes 4.

The included angle between a group of blades at the lower part of the lower drilling rod and the horizontal plane is 30 degrees.

And the lower drill rod is provided with a guniting hole 5, and the guniting hole is positioned below the group of inclined blades 3 at the lower part of the lower drill rod.

The drilling method by using the cement soil bidirectional mixing pile drilling and cutting device specifically comprises the following steps:

step 1: knocking off the horizontal blade with poor cutting capability at the lower end of the original cement mixing pile foundation;

step 2: the cutting blade with the comb-tooth hole and the included angle of 30 degrees with the horizontal plane is welded with the lower end drill rod, and the blade is clockwise during welding;

and step 3: starting equipment, under the drive of a power device, in the process of drilling down, a lower drill rod rotates clockwise and sprays slurry through a slurry spraying hole, an upper drill rod rotates anticlockwise, and the upper drill rod and the lower drill rod stir soil bodies clockwise and anticlockwise while spraying slurry. After the pile is drilled to the designed pile length, spraying and stirring in situ for 30s, and stopping;

and 4, step 4: and when the drill is lifted, the lower drill rod rotates anticlockwise for stirring, and the upper drill rod rotates clockwise for stirring, so that the construction of the stirring pile is completed.