JPH0547782Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a cylindrical chuck device for erecting cylindrical bodies such as steel pipes and casings underground.

(Prior Art) Conventionally, as a device for erecting cylindrical bodies such as steel pipes and casings underground, for example, cylindrical bodies are built using a chuck device integrated with a main body drive unit that is suspended from the leader mast of an excavation vehicle so as to be able to move up and down. A cylindrical body with a digging blade at the tip is clamped and erected into the ground using its own weight or a pushing cylinder, and when the length of the clamped cylinder becomes short, the next cylindrical body is added to the top. There is one in which the chuck portion is re-clamped by a chuck device and the construction is repeated.

On the other hand, a spirally protruding screw part called a friction cut may be provided around the cylindrical body to remove the frictional force against the soil during erection.

This screw part is provided over the entire length of the cylindrical body, but if it is present in the part to be chucked, chucking becomes uncertain or difficult. A cylindrical chuck part of a certain length without a hole is provided, and this part is chucked by a chuck device. When the chuck part is lowered due to construction, the chuck device is removed and an inchworm is used to chuck the chuck part located above the chuck part. The operation is repeated to achieve the desired depth of construction.

However, in order to chuck the chuck part of the lever with a chuck device, if the screw part is provided on the outer peripheral surface of the cylindrical body as described above, the chuck device must be passed through this screw part. After expanding the diameter and passing it through the screw part, a diameter reduction operation is required to chuck it again with the chuck part at the top.

A chuck device for expanding and contracting the diameter in this manner is shown in Japanese Utility Model Application Publication No. 111280/1980, but as shown in Figure 7, this device A pair of arc-shaped chuck plates b, b provided in the cylindrical body a are fixed to arms c, c, respectively, symmetrically with respect to the cylindrical body a, and one end d, d of the arms c, c is attached to the machine frame e as a fulcrum. The other ends g and g are connected to both sides of one jack h, and around the cylindrical body a are chuck plates b' and
Arms c', c' having b' are provided symmetrically with the arms c', c', and one ends d', d' of the arms c', c' are attached to the machine frame e at fulcrums f', f' The other ends g' and g' are connected to both sides of another jack h', and the outer periphery of the cylindrical body a is connected to the four chuck plates b, b, b',
It is surrounded by b′. As a result, when the jacks h, h' are extended, the arms c, c,
Since c' and c' swing around the fulcrums f, f, f', and f', respectively, the chuck plates b, b, b', and b' also move away from the outer periphery of the cylindrical body a, and the chuck is released. , when the jacks h and h' are contracted, the chuck plate b,
b, b', b' are designed to tighten and chuck the cylindrical body a.

(Problem to be solved by the invention) However, in the conventional device described above, the distance between the rotation fulcrum of the arm and the connection part with the jack, that is, the arm becomes long. There is not enough space between the body and the chuck plate, which tends to cause uneven contact, and if there is a screw part on the cylindrical body, this screw part gets in the way and makes it difficult to pull up the chuck device to the next chuck position. In order to sufficiently open the gap between the cylindrical body and the chuck plate, the chuck device itself must be made larger and the stroke for opening and closing must be lengthened, which increases the weight.
The problem was that the structure became complicated, which ultimately led to higher prices.

In view of this, the present invention has a structure that combines the swinging of the arm and the parallel movement of the arm, thereby making the device more compact, and making it possible to sufficiently open the space between the chuck portion of the cylindrical body and the chuck device.
The object of this invention is to provide a chuck device that can sufficiently handle even a cylindrical body having a screw portion, thereby eliminating the drawbacks of the prior art.

[Structure of the idea]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a mechanism for constructing a cylindrical body such as a steel pipe or a casing underground, which is installed in the drive unit body suspended from the leader mast of the excavator body. In a cylindrical chuck device for an excavator, a pair of elongated holes extending in the diametrical direction are provided in the left and right parts of the main machine frame connected to the rotational swinging means of the drive unit main body, and one end of the elongated holes is provided. The joints of each pair of arms are movably engaged by connecting them with pins so that both other ends can be expanded, and the other ends of these arms are connected with jacks to form the cylindrical body. It is characterized by a structure in which the connecting portion is formed so as to surround the connecting portion, and a stopper for regulating the expansion range is provided at the connecting portion.

(Function) With the configuration described above, the chuck surface that chucks the cylindrical body can obtain the necessary gap between it and the cylindrical body by expanding the joint part of the arm and moving in parallel due to the extension of the jack. The chuck device can be easily attached and detached from the chuck portion of the cylindrical body.

(Embodiments) The present invention will be described below with reference to embodiments shown in FIGS. 1 to 6.

As shown in FIG. 4, the chuck device according to the present invention is installed on a drive main body 3 suspended from a leader mast 2 of an excavator main body 1 via a wire rope, etc. It is used to erect the body P underground, and the drive unit main body 3
A pair of elongated holes 6a and 6b are provided at diametrically symmetrical positions on the left and right sides of the main machine frame 5 (see Figs. 1 to 3), which are connected to a rotating and swinging means (not shown), and one elongated hole. 6a, a pair of arms 8b, 8b, one end of which is expandably connected by a pin 7a and the joint part 9a of which is movably engaged; and the other elongated hole 6b,
Similarly to the above, a pair of arms 8c and 8d are expandably connected at one end with a pin 7b and movably engaged with the connecting portion 9b, and the other ends 10a and 10b of the arms 8a and 8b are connected to one end 11a, 12a, and a pair of jacks 11, 12 which connect the other ends 10c, 10d of the arms 8c, 8d to the other ends 11b, 12b, respectively, and each arm 8a, 8b, 8c, 8
chuck plates 13a, 13b, which are respectively fixed to the chuck surface of d so as to surround the cylindrical body P and have an arc having a radius substantially the same as the outer diameter of the cylindrical body P;
13c, 13d, and the arms 8a, 8b and 8c, 8d are connected to the pins 7a, 7b of the connecting portions 9a, 9b.
The stoppers 14a, 1 are provided so as to come into contact with each other in order to restrict the expansion range when expanded around the center.
4b, 14c, 14d, etc.

In the illustrated embodiment, engagement with the elongated holes 6a, 6b is such that the heads 7, 7 (hexagonal heads in the figure) having two parallel sides provided at both ends of the pins 7a, 7b are engaged with the elongated holes 6a, 6b.
a, 6b by slidably fitting.

On the outer periphery of the cylindrical body P, a screw part S for friction cutting of soil is provided with an appropriate pitch and protrudes from the outer periphery, and the part without the screw part S is formed into a chuck part C. ing. The chuck portions C are provided at a plurality of locations on one cylindrical body P at regular intervals in the axial direction.

The stopper 14a, 14b, 14c, 14d
are fixedly installed on the outside of each arm 8a, 8b, 8c, 8d, respectively.
chuck plates 13a, 13b, 1 of b, 8c, 8d
When 3c and 13d are in the chuck state in contact with the outer periphery of the cylindrical body P, the stopper 1 of the arms 8a and 8b
4a and 14b and between the stoppers 14c and 14d of the arms 8c and 8d, there are appropriate intervals,
Moreover, in this case, each jack 11, 12 is attached so as to be in a contracted state.

The fact that the jacks 11 and 12 have expanded and the connecting portions 9a and 9b have moved the most outwardly within the elongated holes 6a and 6b means that each jack plate 13a, 13b, 13
The inner diameter formed by c and 13d is the cylindrical body P.
It is designed to be slightly larger than the outer diameter including the screw portion S. The arms 8a, 8b,
8c and 8d are provided in the machine frame 5 so as to be covered by the main machine frame 5 together with the cylindrical body P, and the rotational force between them is transmitted through the pins 7a and 7b. In the figure, T indicates the digging blade at the lower end of the cylindrical body P.

Next, the operation of the above embodiment will be explained.

When carrying out pile erection work, first, as shown in Fig. 4, a plurality of chucks are installed in the longitudinal direction of the cylindrical body P to be erected into the ground parallel to the leader mast 2 of the excavator main body 1. A suitable part of the part C is selected and chucked by the chuck device 4 at the bottom of the drive part main body 3, and the erection is performed by its own weight or by a pushing cylinder (not shown). At this time, the drive part main body 3 is rotated or Gives oscillation.

The cylindrical body P thus erected is constructed by removing the chuck device 4 from the chuck portion C which is located on the lower side, and by chucking the chuck portion C at the top with the chuck device 4, the cylindrical body P is constructed by inchworm movement.
to be built deep underground.

In its chuck state, the cylindrical body P has four arms 8a, 8b, 8c, 8 as shown in FIG.
d each chuck plate 13a, 13b, 13c, 13
d, and at this time each jack 1
1 and 12 are the shortest lengths, that is, between the other end 10a of the arm 8a and the end 10c of the arm 8c, and between the other end 10b of the arm 8b and the other end 10d of the arm 8d are the shortest lengths, and the connecting portions 9a, 9b Also long hole 6
It is located at the innermost position with respect to a and 6b.

Next, when removing the chuck of the cylindrical body P, first
When the two jacks 11, 12 are extended, each arm 8a, 8b, 8c, 8d is connected to the connecting portion 9.
The stoppers 14a and 14b, and the stoppers 14c and 1
4d is in contact with each arm 8a, 8b, 8c, 8d
further opening is prevented. This state is the fifth
It is a diagram.

When the jacks 11 and 12 are further extended from this state, the arms 8 centered around the pins 7a and 7b
Since rotation of a, 8b, 8c, and 8d becomes impossible due to contact with the stopper, arms 8a and 8b and 8c and 8d work together to guide elongated holes 6a and 6b in the direction of extension of jacks 11 and 12. As a result, the pins 7a and 7b also move in parallel to the elongated hole 6.
Move outward along lines a and 6b. As a result, the chuck plates 13a, 13b, 13c, 1 of each arm
A gap is formed between 3d and the cylindrical body P, and this gap is enlarged to be slightly larger than the screw portion S of the cylindrical body P, as shown in FIG.

Therefore, in this state, the cylindrical body P is passed through,
When the cylindrical body P is located at the next chuck section C without the screw section S, the jacks 11 and 12 of the chuck device 3 may be contracted again to bring the chuck into the chuck state shown in FIG.

In addition, in the illustrated embodiment, arms 8a, 8b, 8
In order to ensure contact with the cylinder P, chuck plates 13a and 13 are provided on the surfaces of c and 8d that contact the cylinder P.
Although the case where the arms 8a to 8d are attached is shown, it goes without saying that the cylindrical body P may be held under pressure by the arms 8a to 8d themselves.

(Effects of the Invention) As explained above, in the present invention, the chuck of the chuck part is performed by combining the swinging of the arm and the parallel movement of the arm by jerking.
Since there is less jerking, the device can be made more compact, and the device can be operated uniformly without deviation, resulting in excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional plan view of an embodiment of a chuck device according to the present invention, Fig. 2 is an external plan view of Fig. 1, and Fig. 3 is a cross section taken along line AA in Fig. 2. 4 is a side view showing an example of an excavator to which the present invention is applied; FIGS. 5 and 6 are operation explanatory diagrams showing the process of the chuck release state of the chuck device shown in FIG. 1;
FIG. 7 is a horizontal sectional view of a conventional chuck device. 1... Excavator main body, 2... Leader mast, 3...
...Drive unit main body, 4...Chuck device, 5...Main machine frame, 6a, 6b...Long hole, 7a, 7b...Pin, 8a, 8b, 8c, 8d...Arm, 9a,
9b...Joining part, 11, 12...Jackie, 14
a, 14b, 14c, 14d...stopper, P...
...Cylindrical body, S...screw part, C...chuck part.

Claims (1)

[Scope of utility model registration request] In a cylindrical chuck device for an excavator, which is provided on a drive unit body suspended from a leader mast of an excavator body and is configured to erect a cylindrical body such as a steel pipe or a casing underground, the rotation of the drive unit body A pair of elongated holes extending in the diametrical direction are provided on the left and right sides of the main machine frame connected to the swinging means, and one end of these elongated holes is connected with a pin so that both ends can be expanded. The coupling portions of each pair of arms are movably engaged, and the other ends of these arms are connected by a jack to surround the cylindrical body,
A chuck device characterized in that a stopper for regulating an expansion range is provided at a connecting portion of the arm.