JPH0455086Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a casing driver for press-fitting and pulling out large-diameter steel pipe piles or steel pipes used in construction and civil engineering foundation work, and a casing driver connected to the casing driver. The present invention relates to a structure for connecting a casing with a reaction force absorbing frame on which a boring machine is mounted.

(Prior art) Conventionally, when press-fitting a steel pipe with a casing driver, if the casing was chucked with a band and a pushing force greater than the weight of the casing driver was applied with a thrust cylinder, the casing driver would lift up, and the casing driver would be lifted up with a swing cylinder. When rotated (i.e., oscillated) alternately left and right,
Since the casing driver swings from side to side, a method is to place a drilling machine for boring into the casing on a stand directly connected to the casing driver, and use its own weight to absorb the press-in reaction force and rocking reaction force. is being carried out. The press-in reaction force can be adequately dealt with by placing weights around the casing driver, but as for the swing reaction force, it is better to apply the load as far away from the center of swing as possible, and this mount is effective in that respect. It is. In addition, if the casing tends to be built at an angle due to soil quality, the jacks attached to the base frame of the casing driver can be expanded and contracted to ensure that the casing is built vertically. In addition to the fact that the entire structure may be slightly tilted, the jack may be expanded or contracted in order to install the casing driver horizontally. At times like this,
In conventional devices, the casing driver and the pedestal are directly connected, so the pedestal moves together with the movement of the casing driver, and twisting force is applied to the pedestal, so the pedestal needs to have a structure that is resistant to torsion. It was hot. For this reason, there were problems such as an increase in the weight of the frame.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned problems, and is a casing driver and a casing driver that prevent twisting moment from acting on the frame even when the jack attached to the casing driver is operated. The purpose is to provide a connection structure with a reaction force absorbing frame.

(Means for Solving the Problems) The present invention has a structure in which the base frame of the casing driver and the reaction force-taking pedestal on which the casing boring machine is mounted are connected via a link,
Either a connecting portion between the link and the pedestal or base frame, or an intermediate portion of the link is relatively rotatably connected by a pin via a spherical bearing, and the other connecting portion is fixedly connected, and The device is characterized in that surface contact portions are provided on both sides of the connection portion by the link, for transmitting the rotational force acting on the base frame of the casing driver to the pedestal,
When press-fitting the casing, the press-fitting reaction force that tries to lift the casing driver is transmitted to the pedestal via the link, and the rocking reaction force is transmitted to the pedestal via the link and one surface contact part to reduce the reaction force. If the base frame of the casing driver is tilted with respect to the pedestal,
Since the base frame rotates relative to the pedestal about the spherical bearing while the contact surfaces of the left and right surface contact parts rub against each other, no torsional force is applied to the pedestal.

(Example) An example of the present invention will be described below with reference to the drawings.
Fig. 2 shows the casing driver in a working state when the present invention is adopted.The reaction force absorbing frame 1 is connected to the casing driver 2 by the structure according to the present invention described later, and the casing 3 is mounted on the frame 1. The work is carried out by mounting the boring machine 4 for medium digging. To explain the outline of the casing driver 2, the casing driver 2 has a ring-shaped elevating frame 2c attached to the elevating frame 2c so as to be movable up and down by a thrust cylinder 2b along a base frame 2a held horizontally by a jack 2e, and a motor attached to the elevating frame 2c. A casing holding device 2d with a band is rotatably attached to the casing holding device 2d, the casing 3 is chucked by the band of the casing holding device 2d, the casing holding device 2d is rotated or swung by a motor, etc., and the thrust cylinder 2b is contracted. The earth and sand inside the casing 3 is excavated by a bucket 5 of an earth drill shown as a digging machine 4, or by a hammer grab bucket, etc., and removed. do. The casing 3 is pulled out by extending the thrust cylinder 2b and pushing up the casing 3 while rotating or swinging the casing holding device 2d with the casing 3 chucked by the band.

On the other hand, the pedestal 1 is normally configured so that it can be divided into a plurality of frames in consideration of transportation, but in this embodiment, in order to reduce the number of divisions and facilitate division and assembly, As shown in the figure, a frame 6 is detachably connected to the casing driver 2, and a pair of side frames 7a and 7b are detachably connected to the frame 6 by pins 10 and on which the crawler of the excavator 4 is mounted. , a widening cylinder 8 consisting of a hydraulic cylinder or a pneumatic cylinder installed between both side frames 7a and 7b and adjusting the distance between the side frames 7a and 7b in accordance with the crawler distance of the excavator; and the frame 6.
It is removably attached by a pin 11 to the side frame 7a, 7b, and penetrates both side frames.
A guide frame 9a that serves as a guide when adjusting the distance,
9b, and during transportation, the guide frame 9
The side frames 7a and 7b are separated from the frame 6 along with the guide frames 9a and 9b, the widening cylinder 8 is contracted to minimize the distance between the side frames 7a and 7b, and both ends of the guide frames 9a and 9b are bent or removed for transportation. It is composed of

Next, the mount 1 and base frame 2a according to the present invention
The connection structure with this will be explained. 12 is a link connecting the pedestal 1 and the base frame 2a;
The link 12 includes left and right mounting arm portions 12a,
12b, and left and right mounting arm parts 12a, 12b.
A connecting arm portion 12 between a horizontal frame portion 12c connected by fixing both ends to the frame 6 and a frame 6 fixed to the center portion of the horizontal frame portion 12c on the pedestal side.
d, and the left and right mounting arms 12a, 12
As shown in FIGS. 1 and 3, b indicates two upper and lower brackets, respectively, on two parallel plate-shaped brackets 13a and 13b fixed to the left and right sides of the base frame 2a of the casing driver 2 on the side of the frame 1. Pin 23 of
They are integrally connected by being connected by.

Further, as shown in FIGS. 1 and 4, the connecting arm portion 12d is relatively rotatable via a spherical bearing 16 by a pin 15 on a bracket 14 fixed to the center portion of the frame 6. connected.

Further, the front end surfaces of the arm portions 12a and 12b are vertically formed, and as shown in FIGS. 1 and 3,
Receptacles 17 provided on opposing parts of the frame 6 at positions on both sides of the pin 15 and the spherical bearing 16.
Surface contact (a, b) with the vertically opposing surfaces of a and 17b
configured to do so.

In this configuration, when the casing 3 is swung for press-fitting or pulling out, as shown in FIG.
(However, P represents surface contact parts a, b, and pin 15.
The force acting in the direction of the arrow on the connection by pin 15, L is the center of the connection by pin 15 and the center of casing 3 O
(distance between the line 18 connecting them and surface contact parts a and b)
is transmitted as a moment. Therefore, the rocking reaction force applied to the casing 3 by the casing driver 2 can be taken by the pedestal 1 on which the hollowing machine 4 is mounted. In addition, the press-fitting reaction force at the time of press-fitting the casing 3 is also
The signal is transmitted to the pedestal 1 via the connecting portion. Furthermore, when one side of the jacks C and D of the jacks A to D shown in FIG. 5 are extended, the arm portion 12a,
The links 12b are in surface contact with the receivers 17a and 17b, respectively, and the spherical bearings 16 allow the links 12
Since the link 12 is rotatable relative to the frame 6, the link 12 is only inclined relative to the frame 6, and no twisting force is applied to the frame 1.

In addition, as shown in FIG. 7, the receivers 17a, 17
A slight gap δ may be created between the arm portion b and the end surfaces of the arm portions 12a and 12b. Also,
As shown in FIG. 8, a gap is provided in advance between the receivers 17a, 17b and the arm portions 12a, 12b, and a gap is provided between the receivers 17a, 17b, for example.
The liner 19 is attached by means such as hanging the hook 18 integrated with the liner 19 on the locking pieces c and d provided on the liner 7b.
It may also be configured to insert .

Moreover, as shown in FIG. 9, the link 12A,
Arms 12a, 12b forming surface contact parts a, b
As shown in the figure, the link 12A and the bracket 14 provided on the frame 6 are connected by two pins 21, 2.
2, and the link 12A and the base frame 2a are connected by one pin 15 and a spherical bearing 16, so that the inclination of the base frame 2a is fixedly connected to the frame 6 (i.e., the frame 1) through the link 12A. ) may be prevented from being transmitted.

Furthermore, as shown in FIG.
A connecting portion using a pin 15 and a spherical bearing 16 is provided in the middle of the
4 and 25, the same effect can be obtained.

(Effects of the invention) As described above, the invention has a structure in which the base frame of the casing driver and the pedestal on which the casing boring machine is mounted are connected via links, and one of the connecting parts can be rotated relative to each other by one pin and a spherical bearing, and surface contact parts are provided on both sides of the connection part to transmit the rotational force acting on the base frame of the casing driver to the pedestal, so that the press-fit reaction is prevented. The role of receiving force and rocking reaction force by the pedestal on which the excavating machine is mounted can be fulfilled in the same way as in the case where the pedestal and the base frame are directly connected. Even if the inclination is adjusted by expanding and contracting the jack, the contact surface will only rub at the surface contact part, and no torsional force will be applied to the pedestal. Therefore, the pedestal should be made of a heavy and rigid structure that can withstand the torsional force. This makes it possible to reduce the weight of the pedestal, to manufacture it at low cost, and to provide a pedestal that is advantageous in terms of transportation.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the connection structure between the pedestal and the base frame according to the present invention, Fig. 2 is a side view showing a casing driver and the pedestal employing the embodiment in a working state, and Fig. 3 4 is a partially sectional side view of the main part of this embodiment, FIG. 4 is a plan sectional view showing a connecting portion using a pin and a spherical bearing in this embodiment, and FIG. 5 is a plan view illustrating the operation of this embodiment. FIG. 6 is an explanatory view of the operation taken along the E-E cross section in FIG. FIG. 6 is a perspective view showing other embodiments of the present invention.

Claims (1)

[Scope of utility model registration request] It has a structure in which a base frame of a casing driver and a reaction force-taking stand on which a casing boring machine is mounted are connected via a link, and a connecting portion between the link and the stand or the base frame,
Alternatively, one of the intermediate parts of the link is relatively rotatably connected by a pin via a spherical bearing, the other connecting part is fixedly connected, and the base of the casing driver is attached on both sides of the connecting part by the link. A connection structure between a casing driver and a pedestal, characterized in that a surface contact portion is provided for transmitting rotational force acting on the frame to the pedestal.