JPH116380A - Connection mechanism of cylindrical casing for earth retaining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection mechanism of a cylindrical casing for earth retaining wherein connection and connection releasing of a rotation cylinder rotated by a casing rotation mechanism and the cylindrical casing for earth retaining are easily performed. SOLUTION: The connection mechanism is provided with a short cylinder 2 vertically, movably and outwardly inserted in the lower end of a rotation cylinder 1 rotated by a casing rotation mechanism only in a constant range, a diameter-widening taper wall 20 downwardly formed on the lower end inner face of the short cylinder 2, a joint pin whose inner end side is inserted in a through hole 10 formed in the rotation cylinder 1 and whose outer end side is in the dovetail groove fitting state with the taper wall 20, and an outer force acting part 4 provided on the short cylinder 2. In the case, when the short cylinder 2 is lowered from a moving region upper end through the outer force acting part 4, and inserted in the hole 90 of a cylindrical easing for earth retaining 9 in which the joint pin 3 is moved inward and the inner end is inserted in the rotation cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for connecting a cylindrical casing for earth retaining in a shovel drill or the like (hereinafter, simply referred to as a mechanism for connecting a cylindrical casing for earth retaining).

[0002]

2. Description of the Related Art When a foundation pile for a building or an expressway is formed in the ground, for example, an earth drill having a drilling bucket is used. In this drill, a drill is basically rotated by a rotating shaft. At the same time as the hole is dug by the bucket, the soil retaining cylindrical casing attached to the casing rotating mechanism is screwed into the hole while rotating through the rotary cylinder.

[0003] Therefore, the wall surface of the hole excavated by the drilling bucket does not collapse due to the presence of the soil retaining cylindrical casing, and the work can be smoothly performed even in the subsequent filling of the soil cement.

Conventionally, however, the mounting of the soil retaining cylindrical casing to the rotary cylinder driven by the casing rotating mechanism is performed by a large number of bolts. Removal was troublesome. In particular, when the hole formed in the ground reaches about 100 m, the above operation must be repeated many times, which is very troublesome.

[0005] Therefore, in recent years, there has been a demand for the development of a connection mechanism for a soil retaining cylindrical casing that allows easy connection and disconnection between a rotating cylindrical body rotated by a casing rotating mechanism and a retaining cylindrical casing.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a connecting mechanism of a soil retaining cylindrical casing which can easily connect and disconnect the rotary cylindrical body rotated by a casing rotating mechanism and the retaining cylindrical casing. The task is to provide.

[0007]

The connecting mechanism of the earth retaining cylindrical casing according to the present invention is a short-circuiting mechanism which is externally movable up and down by a certain range at the lower end of a rotary cylinder 1 rotated by a casing rotating mechanism T. A cylindrical body 2;
A joint pin 3 whose inner end is inserted into a through-hole 10 formed in the rotary cylinder 1 and whose outer end is in a dovetail groove fitting state with the tapered wall 20, and an external force provided on the short cylinder 2. And when the short cylindrical body 2 is lowered from the upper end of the movement area through the external force acting part 4, the joint pin 3 is moved inward, and the inner end of the joint pin 3 is moved to the rotating cylinder. It is adapted to be inserted into a hole 90 of the earth retaining cylindrical casing 9 inserted into the body 1.

With respect to the above-mentioned connecting mechanism, the short cylinder 2 cannot be moved with respect to the rotary cylinder 1 when the joint pin 3 is inserted into the hole 90 of the earth retaining cylindrical casing 9 by a predetermined amount. Locking part B that functions to smooth
Is preferably provided.

Here, the function of the connecting mechanism of the earth retaining cylindrical casing in the present invention will be clarified in the following embodiments of the present invention.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a connecting mechanism of a soil retaining cylindrical casing in a shovel drilling machine and its related parts, and FIGS. 4 to 6 show that the retaining cylindrical casing 9 is a rotary cylinder 1. Shows the process of connecting / disconnecting to / from. In this drilling machine, the drilling bucket DB is rotated by the rotation axis S, and the rotary cylinder 1 to which the earth retaining cylindrical casing 9 is connected is connected to the casing rotating mechanism T.
To make it rotate. [Schematic Description of Entire Linking Mechanism] As shown in FIG. 4, the coupling mechanism includes a joint portion A that connects a soil retaining cylindrical casing 9 to a lower end portion of a rotating cylinder 1 that is rotated by a casing rotating mechanism T; The body 1 and the earth retaining cylindrical casing 9 are constituted by a lock portion B for preventing accidental detachment. The joint portions A are arranged at intervals of 30 ° as shown in FIG. As shown in FIG.
° are arranged at intervals.

As shown in FIG. 4, the joint portion A has a short cylinder 2 which is externally mounted on the lower end of the rotary cylinder 1 so as to be movable up and down by a predetermined range, and an inner surface at the lower end of the short cylinder 2. A formed tapered wall 20 whose diameter increases downward, and a joint pin whose inner end is inserted into the through hole 10 formed in the rotary cylinder 1 and whose outer end is in a dovetail groove fitting state with the tapered wall 20. 3
And an external force acting member 4 ′ provided in the short cylinder 2 so as to be movable only within a certain range, and when the short cylinder 2 is lowered from the upper end of the movement area through the external force acting member 4 ′, As shown in FIGS. 5 and 6, the joint pin 3 is moved inward so that its inner end is inserted into the hole 90 of the earth retaining cylindrical casing 9 inserted into the rotary cylinder 1. It is.

As shown in FIG. 4, the lock portion B is provided with a lock pin 5 provided so as to be able to penetrate therethrough from the outer surface side to the inner surface side of the short cylindrical body 2, and urges the lock pin 5 outward. It comprises a spring 6 and a through-hole 11 formed in the rotary cylinder 1, and the joint pin 3 as shown in FIG.
Is inserted into the hole 90 by a predetermined amount, and as shown in FIG.
Are inserted into the through-hole 11 against the urging force of the spring 6. [Regarding the structure of the rotary cylinder 1 ] As shown in FIG. 4, the rotary cylinder 1 has a vertical groove 12
The above-mentioned through hole 11 is formed in the lower end side area of 12, and a through hole 10 having a diameter slightly larger than that of the joint pin 3 is formed at a lower end of the vertical groove 12 than at the lower end.

FIG. 4 shows the lower end of the rotary cylinder 1.
As shown in FIG. 5, an enlarged hole 13 formed by cutting the inner surface is provided. [Regarding the Configuration of the Short Cylindrical Body 2 ] As shown in FIG. 4, the short cylindrical body 2 has an empty space 21 for accommodating the external force acting member 4 'so as to be vertically movable by a predetermined distance, 6 and a taper wall 20 having the above-mentioned dovetail groove. The range in which the short cylinder 2 moves up and down with respect to the rotary cylinder 1 is restricted by the engagement between the accommodating portion 22 and the vertical groove 12. At one time, the lock pin 5 is opposed to the through hole 11 as shown in FIG. [Configuration of Joint Pin 3 ] Joint Pin 3
Has an outer end portion having a dovetail shape fitted into the dovetail groove and an inner end portion having a small diameter and a tapered shape as shown in FIG. , The tapered portion 30 is inserted into the hole 90.

Here, as shown in FIG. 5 and FIG. 6, the joint pin 3 is formed with a stepped portion 31 formed at the base end of the tapered portion 30 and a wall portion of the hole 90 so that the joint pin 3 has a predetermined hole. It is not inserted into 90. [Configuration of external force acting member 4 ' ] External force acting member 4'
As shown in FIG. 4, a bar 41 on which a string H or the like is hooked is erected on the outer surface side of the flat plate 40.
40 is formed by an upper thick portion 42, a lower portion by a thin portion 43, and an inclined portion 44 therebetween. [Regarding the Configuration of the Lock Pin 5 ] FIG.
As shown in FIG. 5, the upper end of the head 50 is formed of a thin portion 43 of the flat plate 40 until the entire tapered portion 30 of the joint pin 3 is inserted into the hole 90. Is in contact with the inner surface of the Immediately after the entire tapered portion 30 is inserted into the hole 90, the head 50 is pushed into the housing portion 22 by the inner surface of the thick portion 42 of the flat plate member 40 as shown in FIG. It is designed to be inserted into the through hole 11. [Regarding Configuration of Spring 6 ] The spring 6 is a ring-shaped disc spring as shown in FIG. [Regarding Configuration of Retaining Cylindrical Casing 9 ] As shown in FIG. 4, the retaining cylindrical casing 9 has an insertion portion 91 formed by cutting the outer surface thereof.
The insertion portion 91 is provided with the above-described hole 90 (formed in a tapered shape). When the insertion portion 91 is inserted into the enlarged diameter hole portion 13, the hole 90 faces the joint pin 3. It is like that. [The casing 9 is connected by the connecting mechanism of this embodiment.
4 ) As shown in FIG. 4, the rotary cylinder 1 is inserted into the enlarged diameter hole 13 of the earth retaining cylindrical casing 9 into the insertion portion 91. In this state, the joint pin 3 and the hole 90 face each other as described above. Next, the string H or the like is hooked on the rod of the external force acting member 4 ′ from the state of FIG. 4 to apply a downward force to the rod 41. Then, the inclined portion 44 of the external force acting member 4 ′ and the head of the lock pin 5
As the short cylinder body 2 moves downward with the engagement state with 50, the tapered portion 30 of the joint pin 3 is inserted into the hole 90. Here, when the short cylindrical body 2 moves to the lowermost end of the movement area, as shown in FIG. 5, the stepped portion 31 of the joint pin 3 is in contact with the component wall of the hole 90 of the earth retaining cylindrical casing 9. Further, the inner end of the shaft portion 51 of the lock pin 5 faces the through hole 11. Further, when a downward force is applied to the rod 41, the external force acting member 4 'moves downward with respect to the short cylinder 2 which cannot move downward, whereby the contact with the head 50 is inclined. The inner end of the shaft portion 51 of the lock pin 5 is inserted into the through-hole 11 at the same time as the transition from the thin portion 43 to the thick portion 42 via the portion 44. That is, the joint part A functions and the lock part B functions. When the casing 9 is detached from the rotary cylinder 1, an upward force may be applied to the rod 41 by a string H or the like connected to the rod 41 as shown in FIG. In this case, first, the lock portion B is in the released state, and subsequently, the joint portion A is in the released state.

As described above, when the coupling mechanism of this embodiment is adopted, the joint portion A and the lock portion B can be used to connect and disconnect the rotary cylinder 1 of the casing rotation mechanism T and the earth retaining cylindrical casing 9. It is easy to perform and the connection is secure.

In the above embodiment, the joint pin 3 and the tapered wall 20 are set in the dovetail groove fitting state so that the joint pin 3 moves in and out as the short cylinder 2 moves up and down. However, the present invention is not limited to this. That is, the joint pin 3 is urged outward by a spring, and the joint pin 3 is brought into contact with the tapered wall 20 having no dovetail groove. A structure that moves in and out may be employed.

[0018]

Since the present invention has the above-described configuration, it has the following effects.

From the contents described in the description of the embodiments of the present invention, it is possible to provide a connecting mechanism of the earth retaining cylindrical casing that can easily connect and disconnect the casing rotating mechanism and the earth retaining cylindrical casing.

[Brief description of the drawings]

FIG. 1 is a view showing a main part of a shovel drilling machine having a connection mechanism according to an embodiment of the present invention, and is an explanatory view when a soil retaining cylindrical casing is connected to a rotary cylinder.

FIG. 2 is a plan view showing an arrangement of a lock portion of the connection mechanism.

FIG. 3 is a plan view showing an arrangement of a joint portion of the connection mechanism.

FIG. 4 is a cross-sectional view of the connection mechanism when the external force acting member is at the uppermost position of a movement area thereof.

FIG. 5 is a cross-sectional view showing a state in which only a joint part is functioning in the connection mechanism.

FIG. 6 is a cross-sectional view showing a state in which a joint section and a lock section are functioning in the connection mechanism.

FIG. 7 is an explanatory view when the earth retaining cylindrical casing is removed from the rotary cylinder.

[Explanation of symbols]

 T Casing rotation mechanism A Joint part B Lock part 1 Rotating cylinder 2 Short cylinder 3 Joint pin 4 External force acting part 4 'External force acting member 9 Cylindrical casing for earth retaining 10 Through hole 20 Tapered wall 90 hole

Claims (2)

[Claims] 1. A short cylinder (2) externally movably moved up and down by a predetermined range at a lower end of a rotary cylinder (1) rotated by a casing rotation mechanism (T); )
A tapered wall (20) formed on the inner surface of the lower end portion of the lower end, the diameter of which increases downward, and an inner end side is inserted into a through hole (10) formed in the rotary cylinder (1), and an outer end side is the tapered wall. (20), a joint pin (3) in a dovetail groove fitting state, and an external force acting portion (4) provided in the short cylinder (2), wherein the external force acting portion (4) is provided. When the short cylinder (2) is lowered from the upper end of the moving area through the joint, the joint pin (3) is moved inward, and the inner end of the joint pin (3) is inserted into the rotary cylinder (1). A connecting mechanism for a cylindrical casing for earth retaining, wherein the connecting mechanism is inserted into a hole (90) of a cylindrical casing (9). 2. When the joint pin (3) is inserted into the hole (90) of the earth retaining cylindrical casing (9) by a predetermined amount, the short cylindrical body (1) is rotated with respect to the rotary cylindrical body (1). 2)
2. The connecting mechanism for a soil retaining cylindrical casing according to claim 1, further comprising a lock portion (B) that functions to make the movable member immovable.