JPS62190779U

JPS62190779U -

Info

Publication number: JPS62190779U
Application number: JP7620486U
Authority: JP
Priority date: 1986-05-22
Filing date: 1986-05-22
Publication date: 1987-12-04
Also published as: JPH0316954Y2

Description

[Brief explanation of the drawing]

第１図ないし第４図はこの考案の一実施例に係
る砂礫地盤削孔用ビツトを示すものであつて、第
１図は側面図、第２図は正面図、第３図は第２図
のＡ―Ａ線断面図、第４図は第２図のＢ―Ｂ線断
面図である。第５図はこの考案のビツトを使用し
て削孔している状態を示す縦断側面図、第６図は
この考案のビツトの前端縁部が礫に突き当たつた
状態を示す縦断側面図、第７図はそのビツトの前
部テーパー部分が礫を孔壁の地山に押込んで通過
するときの状態を示す縦断側面図、第８図はこの
考案のビツトを引抜くとき孔壁から突出している
礫がビツトの後部テーパー部分に突き当たつた状
態を示す縦断側面図、第９図はビツトの後部テー
パー部分が礫を孔壁の地山に押込んで通過すると
きの状態を示す縦断側面図である。第１０図は従
来のクローラー用ビツトの正面図、第１１図はそ
の側面図、第１２図は従来のクローラー用ビツト
により砂礫地盤に削孔している状態を示す縦断側
面図、第１３図は従来のクローラー用ビツトの前
端縁部が礫に突き当たつた状態を示す縦断側面図
、第１４図は礫が孔内に崩落した状態を示す縦断
側面図、第１５図は深い削孔を行なう際にクロー
ラー用ビツトの前端縁部が礫に突き当たつた状態
を示す縦断側面図、第１６図はロツドが撓み変形
すると共に孔が彎曲した状態を示す縦断側面図で
ある。図において、１はビツト本体、２は前部テーパ
ー部分、３は後部テーパー部分、４は切削用チツ
プ、５は側面噴気溝、９は礫、１０はロツド、１
２はビツト本体摩耗防止用チツプ、１４は噴気孔
、１５は傾斜送気孔、１６は溝である。 1 to 4 show a sand and gravel ground drilling bit according to an embodiment of this invention, in which FIG. 1 is a side view, FIG. 2 is a front view, and FIG. 3 is a second view. FIG. 4 is a sectional view taken along line AA in FIG. 2, and FIG. 4 is a sectional view taken along line BB in FIG. Fig. 5 is a vertical side view showing a state in which a hole is being drilled using the bit of this invention, and Fig. 6 is a longitudinal side view showing a state in which the front edge of the bit of this invention is in contact with gravel. Fig. 7 is a vertical cross-sectional side view showing the state in which the front tapered part of the bit pushes gravel into the ground of the hole wall and passes through it, and Fig. 8 shows the state in which the front tapered part of the bit protrudes from the hole wall when the bit of this invention is pulled out. Fig. 9 is a vertical side view showing the state in which the gravel in the bit hits the rear tapered part of the bit, and Figure 9 is a vertical side view showing the state when the rear taper part of the bit pushes the gravel into the ground of the hole wall. It is. Fig. 10 is a front view of a conventional crawler bit, Fig. 11 is a side view thereof, Fig. 12 is a vertical side view showing a state in which a conventional crawler bit is drilling a hole in gravel ground, and Fig. 13 is a side view of the conventional crawler bit. A vertical side view showing the front edge of a conventional crawler bit hitting gravel, Figure 14 is a vertical side view showing the gravel has collapsed into the hole, and Figure 15 is a deep hole drilling. FIG. 16 is a longitudinal side view showing a state in which the front end of the crawler bit hits gravel, and FIG. 16 is a longitudinal side view showing a state in which the rod is bent and deformed and the hole is curved. In the figure, 1 is the bit body, 2 is the front tapered part, 3 is the rear taper part, 4 is the cutting tip, 5 is the side blow groove, 9 is gravel, 10 is rod, 1
2 is a chip for preventing wear of the bit body, 14 is a blowhole, 15 is an inclined air supply hole, and 16 is a groove.

Claims

[Scope of utility model registration request]

A bit body 1 connected to the tip of the rod includes a front tapered part 2 whose diameter decreases from the middle part toward the front end and a rear tapered part 3 whose diameter decreases from the middle part to the rear end. A plurality of cemented carbide cutting chips 4 extending in the radial direction are embedded and fixed in the front end portion of the bit. A sand and gravel ground drilling bit characterized in that the main body 1 is provided with an air supply hole that opens at the center of the front end of the front tapered portion 2 and into the side blowhole groove 5.