JPH0444708Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a joint used for replenishing an excavation casing.

[Conventional technology]

The excavation casing is disposed outside a ground excavation device such as an auger screw or a drilling bucket, and is inserted into the ground together with the ground excavation device.

For example, the auger screw of an earth auger is inserted into the ground in a cutting-like manner by the rotational drive device at the top, and the earth and sand cut by the auger head at the tip are pushed up along the screw blades to drill holes. By placing a casing on the outside of the creue and erecting it at the same time, it is possible to prevent the collapse of the hole wall, and since the auger crew is excavated inside the casing, the frictional resistance is small and excavation can be performed with less load. It can be carried out.

Furthermore, in recent years, the casing itself has been equipped with a digging blade at its tip, which can be rotated and inserted into the ground.
A casing is used to actively excavate the ground in a donut shape, and at the same time, the inside of the casing is excavated using a drilling device such as an auger screw.

By the way, when the drilling depth is large, once one piece of the casing for excavation is erected in the ground, another piece is added on top of it, and the casing is rotated and inserted sequentially into longer pieces.

In this case, as a joint for the casing, it is time-consuming to overlap the end flanges and connect them with bolts and nuts, so a one-touch type joint as shown in FIGS. 11 and 12 is used.

In the figure, 1 is a rectangular tenon on the circumferential surface of the engaging protrusion 2.
3 is this engagement convex portion 2.
A vertical groove 4a having the same width as the horizontal width α of the engagement convex portion 2 and a horizontal groove 4 having the same width as the vertical width β of the engagement convex portion 2 that enters at right angles from the vertical groove 4a.
This is a female joint member in which the hook-shaped engagement groove 4 consisting of b is a so-called mortise groove.

The end of the vertical groove 4a of the engaging groove 4 is open to the end of the female joint member 3, and the engaging protrusion 2 is inserted into the vertical groove 4a through this opening, and then inserted deeply. The coupling between the male member 1 and the female member 3 is completed by sliding the member into the lateral groove 4b.

The engaging protrusion 2 moves in the vertical direction by entering into the lateral groove 4b, and the lateral groove 4b has an end facing in the direction opposite to the direction in which the female member 3 rotates, and the engaging protrusion 2 is located at this end. Since they abut, movement in the lateral direction is restricted.

Therefore, even when the male joint member 1 is attached to the rotary drive device using the joining flange 8 as shown in FIG. 12, or when the female joint member 3 is attached to the rotary drive device using the joining flange 8 as shown in FIG. Both fit into the other female joint member 3 and male joint member 1 attached to the upper end of the casing body 5, and transmit the rotational force of the rotary drive device to the casing body 5.

[The problem that the idea attempts to solve]

In the conventional joints shown in FIGS. 11 and 12, earth and sand enters the engagement groove 4 together with the engagement protrusion 2, and as a result, the engagement protrusion 2 is prevented from fitting into the lateral groove 4b. The coupling between the joint members becomes incomplete.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide a joint for an excavation casing that can provide reliable connection by preventing earth and sand from accumulating in an engagement groove.

[Means for solving problems]

In order to solve the above-mentioned object, the present invention includes a male joint member having a rectangular engagement protrusion on the circumferential surface, a vertical groove having the same width as the width of the engagement protrusion, and a vertical groove that enters at right angles from the vertical groove to engage the coupling member. In a joint for an excavation casing that combines a joint female member with a hook-shaped engagement groove consisting of a horizontal groove with the same width as the vertical width of the mating convex part, the joint female member has a triple structure of an outer cylinder, a middle cylinder, and an inner cylinder. The inner cylinder is provided with a vertical groove and an extended part formed by further extending the vertical groove, and a notch that becomes the horizontal groove is formed at a position where the vertical groove and the extended part are symmetrical. The outer cylinder should fit into the upper part of the middle cylinder so that its lower end is above this notch, and the outer cylinder should cover the middle cylinder up to the top of the notch with its lower ends almost flush with each other. It is.

[Effect]

According to the present invention, when the male joint member is fitted into the female joint member, even if dirt adheres to the engaging protrusion of the male member and enters the engaging groove of the female member together with the engaging protrusion, When the engaging convex portion transitions from the vertical groove to the horizontal groove, the earth and sand can be prevented from being pushed toward the extending portion of the vertical groove and interfering with the connection.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a front view showing one embodiment of the excavation casing joint of the present invention, and Fig. 11 showing the conventional example;
Components that are the same as those in FIG. 12 are given the same reference numerals.

In the figure, 5 is a casing body, and in this embodiment, this casing body 5 is provided with screw blades 6 on the outside.

The male joint member 1 is fixed to the upper end of the casing body 5 by welding or the like, and is made of a tube having the same diameter as the casing body 5, and has a rectangular engagement convex on its outer periphery as shown in FIGS. 7 to 10. Two parts 2 were provided protrudingly at symmetrical positions. The upper end of this engaging convex portion 2 is made to substantially coincide with the upper end of the outer periphery of the male member 1, and a band-shaped protrusion 7 extending in the circumferential direction is provided near the lower end of the outer periphery of the male member 1.

On the other hand, the female joint member 3 is to be joined to a rotational drive device (not shown), and has a joining flange 8 secured by bolts at its upper end.

The female joint member 3 consists of a vertical groove 4a having the same width as the width α of the engaging convex portion 2, and a horizontal groove 4b entering at right angles from the vertical groove 4a and having the same width as the vertical width β of the engaging convex portion 2. The provision of the engagement groove 4 is the same as the conventional example, but in the present invention, the vertical groove 4a not only opens at the lower end, but also has an upwardly extending portion 9 extending beyond the part communicating with the horizontal groove 4b. . Although this extended portion 9 may be closed midway, in the case of this embodiment, it penetrates upward and opens.

In this embodiment, the female joint member 3 includes an outer cylinder 3a and an inner cylinder 3.
b and an inner cylinder 3c, and the middle cylinder 3b further extends the longitudinal groove 4a of the engagement groove 4 to provide an extension part 9, so that the longitudinal groove 4a and the extension part 4 are symmetrical. A notch is formed at the position to become a horizontal T-shaped horizontal groove 4b, and the lower end of the inner cylinder 3c enters into the upper part of the middle cylinder 3b, and the outer cylinder 3a is half-shaped with its lower ends almost flush with the middle cylinder 3b. Attach to cover the above.

As a result, the part of the middle cylinder 3b where the inner cylinder 3c does not fit becomes the fitting part of the male joint member 1, and is covered with the outer surface of the vertical groove 4a and the horizontal groove 4b of the engagement groove 4 and the outer cylinder 3a, while The inside of the installation part 9 is the inner cylinder 3c.
covered, and the outside is open.

On the other hand, the joining flange 8 was attached to the upper end of the inner cylinder 3c, and reinforcing rib pieces 10 were provided radially between the inner cylinder 3c and the outer peripheral upper end thereof.

Next, to explain how to use it, the male joint member 1
is fixed to the casing body 5 by welding. On the other hand, the female joint member 3 is bolted to a rotary drive device (not shown) via a joining flange 8, and the male joint member 1 is inserted into the female joint member 3.

In this case, the engagement protrusion 2 enters the vertical groove 4a of the engagement groove 4 from its lower end opening, moves into the vertical groove 4a as it is, and then bends at a right angle to form the horizontal groove 4a.
b (see Figure 2).

This completes the connection between the joint members, but even if dirt accumulates on the engagement protrusion 2 and enters the vertical groove 4a, the dirt and sand accumulate when the engagement protrusion 2 moves to the horizontal groove 4b. is pushed towards the extension part 9,
Thereby, when inserting the engaging convex portion 2 into the lateral groove 4b, dirt and the like can be removed and the transition can be made smoothly.

Moreover, the earth and sand pushed out to the extension part 9 is discharged to the outside from the upper surface thereof.

Although the casing body 5 is shown at the top in the illustrated example, the female joint member 3 is attached to the lower end of the casing body 5, and the joint male member at the upper end of the lower casing body (not shown) is connected to the joint between the casings. The same applies when adding.

In the above embodiment, the middle cylinder 3b is fitted on the outer periphery of the inner cylinder 3c, and the outer cylinder 3a is fitted on the outer periphery of the middle cylinder 3b, so that when the male joint member 1 and the female joint member 3 are connected, the joint Inner diameter of section and casing body 5
Although the inner diameter of the casing body and the outer diameter of the joint portion are the same, it is also possible to make the outer diameter of the casing body and the joint portion the same. This will be explained below with reference to FIG. 13.A middle cylinder 3b' and an inner cylinder 3c' are sequentially inserted and welded into an outer cylinder 3a' formed to have the same outer diameter as the outer diameter of the casing body 5'. vertical groove 4 in the middle cylinder 3b'
a' and a lateral groove 4b' are provided to form a female joint member 3'.

On the other hand, the male joint member 1' is attached to a cylindrical body 1 having an outer diameter approximately the same as the inner diameter of the middle cylinder 3b' at the upper end of the casing body 5'.
a' is welded and an engaging protrusion 2' is protruded from the outer periphery of the welded part a'. Therefore, when the male member 1' is fitted into the female member 3', the outer diameter of the joint portion and the outer diameter of the casing body 5' are the same.

[Effect of idea]

As described above, the joint of the excavation casing of the present invention includes a male joint member having a rectangular engaging protrusion on the circumferential surface, a vertical groove having the same width as the engaging protrusion, and a vertical groove having the same width as the engaging protrusion. In a joint for an excavation casing that is combined with a female joint member provided with a hook-shaped engagement groove consisting of a horizontal groove having the same width as the vertical width of the engagement convex part, the earth and sand along with the engagement convex part enter the engagement groove at a right angle. Even if it gets inside, it will not accumulate, so a reliable fit can be obtained.

[Brief explanation of drawings]

Figure 1 shows one of the joints of the excavation casing of the present invention.
A front view showing the embodiment, FIG. 2 is a front view of the above joined state, FIG. 3 is a plan view of the female joint member, FIG. 4 is a front view of the above, FIG. 5 is a side view of the above, and FIG. 6 is the same as the above. 7 is a plan view of the male joint member, FIG. 8 is a front view of the same, FIG. 9 is a top side view of the same, FIG. 10 is a bottom view of the same, FIG. 11 is a front view showing a conventional example, 12
The figure is a front view showing another conventional example, and FIG. 13 is a front view showing another embodiment of the present invention. 1, 1'... Male joint member, 2, 2'... Engaging convex portion, 3, 3'... Female engaging member, 3a, 3a'... Outer cylinder, 3b, 3b'... Middle cylinder, 3c, 3c'...inner cylinder,
4, 4'...Engagement groove, 4a, 4a'...Vertical groove, 4b,
4b'...Horizontal groove, 5,5'...Casing body, 6
... Screw blade, 7 ... Protrusion, 8 ... Joining flange, 9 ... Extension part, 10 ... Rib piece.

Claims (1)

[Scope of utility model registration request] A male joint member having a rectangular engagement protrusion on its circumferential surface, a vertical groove having the same width as the width of the engagement protrusion, and a vertical groove extending at right angles from the longitudinal groove and having the same width as the longitudinal width of the engagement protrusion. In a joint for an excavation casing that combines a joint female member with a hook-shaped engagement groove consisting of a horizontal groove, the joint female member has a triple structure of an outer cylinder, a middle cylinder, and an inner cylinder, and the middle cylinder has a vertical groove and a vertical groove. An extension part is provided by further extending the
Further, a notch serving as the horizontal groove is formed at a position where the vertical groove and the extension portion are symmetrical, and the inner cylinder enters into the upper part of the middle cylinder so that its lower end is above the notch, and A joint for an excavation casing, characterized in that the outer cylinder has its lower ends almost flush with the middle cylinder and covers up to the top of the notch in the middle cylinder.