JPH0536569B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a board drain construction machine that buries a moisture absorption board drain underground in order to improve soft ground such as wetlands and reclaimed land that contain moisture. The present invention relates to a device for press-fitting a mandrel containing a board drain into the ground.

(Conventional technology) In order to improve soft ground, board drains (used to be made of paper and called paper drains, but in recent years plastic drains have become mainstream)
Sometimes called a plastic drain. ) is housed in a pipe called a mandrel to prevent it from coming off, and is buried using a construction machine so that the upper end of the board drain is exposed above the ground. By leaving it for a long period of time, the groundwater sucked up through the board drain evaporates above the ground, thereby improving the ground.

In construction machines for improving soft ground that use such board drains, conventional devices for press-fitting the mandrel include one that applies vibrating force from a vibrohammer from the top of the mandrel, and one that applies the vibrating force of a vibrohammer from the top of the mandrel, and one that applies a wire rope wound by a winch to the top of the mandrel. Some types are press-fitted by connecting to a device that grips them.

However, since these press-fitting devices apply a pushing force from the top or upper part of the mandrel, there is a problem that if the mandrel becomes long, it may bend, buckle, or break.

Further, since the conventional press-fitting apparatus press-fits one board at a time using one construction machine, there is a problem in that it takes a long time to bury the board drain in a vast landfill or the like.

(Problems to be Solved by the Invention) The present invention has been developed in view of the above-mentioned problems, and is capable of press-fitting a mandrel without buckling or deforming it, efficiently burying a board drain, and further improving the construction conditions. The purpose of the present invention is to provide a mandrel press-fitting device that enables appropriate construction depending on the situation.

(Means for solving the problem) In order to achieve this object, the present invention connects one end of a hydraulic cylinder for mandrel press-fitting to the lower part of a leader, and connects the other end of the hydraulic cylinder to a guide rail attached to the leader. The mandrel is connected to the center of the press-fit stand that is raised and lowered along the
This device is characterized by multiple sets of chuck devices consisting of left and right chuck bands for holding the mandrel and hydraulic cylinders for opening and closing the chuck bands, the mutual spacing of which can be adjusted. Since the mandrels are held and press-fitted by a device, there is no buckling or deformation, and it is efficient because multiple mandrels can be press-fitted at the same time. Furthermore, since the chuck devices are installed so that the mutual spacing can be adjusted, the spacing between the chuck devices can be adjusted, making it possible to carry out construction at a construction pitch that suits the depth, ground condition, etc.

(Example) An example of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing an example of a board drain construction machine equipped with a mandrel press-fitting device according to the present invention. In Fig. 1, reference numeral 1 denotes a construction machine body, in which an upper rolling body 1c is installed on a lower running body 1a via a rolling device 1b, and a prime mover, a hoisting device and a Various control devices are incorporated. Reference numeral 2 denotes a leader, and the leader 2 is rotatably erected at the front part of the upper rolling body 1c via a bracket and a pin, and is interposed between the upper part and the rear part of the upper rolling body 1c. It is supported almost vertically by the left and right back stays 3. As shown in FIG. 2, the leader 2 of this embodiment consists of two elongated cylindrical bodies 2a connected by flanges and a cross member 2c connecting the two. In addition, the main body 1 can also adopt a structure in which a hydraulic shovel or the like is used and the leader 2 is attached to the tip of a boom.

Reference numeral 20 indicates a guide rail provided along the leader 2, and reference numeral 5 indicates a tool hoisting device mounted so as to be vertically movable via a guide gib 21 that slides along the guide rail 20. 5 is
A winch 22 installed on the upper rotation body 1c
The tool hoisting device 5 is equipped with a reel device 6 on which a board drain is wound, and a mandrel 7 is fixed in a hanging manner. Alternatively, it can be attached removably using bolts, etc. Since the present invention is configured so that a plurality of mandrels 7 (two in this embodiment as shown in FIG. 2) can be provided, the tool hoisting device 5 also has a plurality of mandrels 7. As provided,
It has a plurality of parts on which mandrels 7 are provided, and the same number of reel devices 6. The mandrel 7 is a hollow steel pipe that houses the board drain therein, and prevents it from coming off by bending the lower end of the board drain and locking it to the mandrel 7.

Next, the mandrel press-fitting device 23 will be explained. As shown in FIG. 1, the press-fitting device 23 is provided at the lower part of the leader 2, and as shown in FIGS. 2 and 3, it has a press-fitting stand 8 having a U-shaped cross section. A guide gib 9 that slides along the guide rail 20 is attached to the left and right sides of the back surface of the press-fit stand 8, and a mandrel press-fit is installed between the bracket 24 provided on the upper part of the press-fit stand 8 and the bracket 25 fixed to the leader 2. A hydraulic cylinder 18 is attached by connecting its both ends with pins 19a and 19b.

Two chuck devices 10A and 10B are attached to the press-fitting stand 8 by the following mechanism so that the distance between them can be adjusted freely. Inside the press-fit stand 8, two sets of vertical plates 26, 27 are fixedly arranged at intervals, and two reaction force-taking pins 15, 15 and screw rods are installed between each vertical plate 26, 27. 16 is slidably inserted into the holes 28, 28, 29 provided in the mounting bracket 12 of the chuck devices 10A, 10B, and screws 17a, 17b are inserted into the threaded rod 16 so as to sandwich the mounting bracket 12. screw them together, then loosen either screw 17a or 17b, move the mounting bracket 12 horizontally, and remove the screw 17.
By tightening a and 17b, the mounting bracket 12 can be positioned at any desired position.

The mounting bracket 12 has chuck bands 33a and 33b that sandwich the mandrel 7, with the coaxial pin 11 at the center and the pin 13 between the ends of the bands.
Hydraulic cylinder 14 attached by a, 13b
It is installed so that it can be opened and closed by.

Further, a spare press-fit stand 8A having a position-adjustable chuck device (not shown) such as the chuck devices 10A and 10B is detachably connected to both ends of the press-fit stand 8 by bolts 34 and nuts 35. It has a coupling part 36.

When press-fitting the mandrel 7 using this press-fitting device 23, chuck devices 10A and 10B are used.
The mandrel 7 is held between the chuck bands 33a and 33b by contracting the hydraulic cylinder 14, and the hydraulic cylinder 18 is extended. Here, the chuck devices 10A and 10B are attached to a mounting bracket 12.
is attached to the press-fit stand 8 via two reaction force-taking pins 15, so that a press force is applied to the mandrel 7 via the press-fit stand 8 and the chuck devices 10A and 10B, with the weight of the main body 1 as a reaction force. join. Next, the hydraulic cylinder 14 is extended to separate the mandrel 7 from the chuck bands 33a, 33b, the hydraulic cylinder 18 is contracted to pull up the press-fit stand 8, and the hydraulic cylinder 14 is contracted again to sandwich the mandrel 7 between the chuck bands 33a, 33b. By repeating the operations of extending the hydraulic cylinder 18 and press-fitting the mandrel 7, the entire mandrel 7 is press-fitted into the ground. After that, the mandrel 7 is connected to chuck devices 10A and 10B.
When the tool take-up device 5 is pulled up together with the mandrel 7 by the winch 22, only the board drain in the mandrel 7 remains underground, and by cutting the mandrel 7 on the ground, the board drain at that point is removed. Once the construction is completed, the same work will be repeated at another location.

The device of the present invention allows the position adjustment of the chuck devices 10A, 10B, that is, the mutual spacing adjustment, by tightening and loosening the screws 17a, 17b and moving the bracket 12 as shown in the embodiment, for example, so that the mandrel 7, The spacing between 7 can be adjusted according to the depth and ground conditions during construction.

Furthermore, in this embodiment, since the connecting portions 36 to which the spare press-fit stand 8A can be connected are provided at both ends of the press-fit stand 8, it is also possible to further increase the number of mandrels 7. When connecting the spare press-fitting stand 8A, the same number of reel devices 6 as mandrels 7 are installed on the tool hoisting device 5 as well. Furthermore, the number of chuck devices 10A, 10B attached to one press-fitting stand 8 can be varied in various ways.

(Effects of the Invention) As described above, the mandrel press-fitting device of the present invention is configured such that the press-fitting stand having the chuck device that clamps the mandrel is raised and lowered by the hydraulic cylinder provided at the lower part of the leader.
Since the mandrel is clamped and press-fitted by the chuck device at a low position close to the ground, buckling and deformation of the mandrel can be prevented.

Furthermore, since a plurality of sets of chuck devices are provided on the press-fitting stand, a plurality of mandrels can be press-fitted at the same time, making it possible to perform the work efficiently.

Furthermore, since the construction is such that the mutual spacing between the chuck devices can be adjusted, it is possible to adapt to changes in the construction pitch using one construction machine. In addition, multiple chuck devices are installed on a single press-fitting stand so that the spacing can be adjusted freely, allowing single-pipe, two-pipe simultaneous, three-pipe simultaneous, or four-pipe simultaneous construction according to construction conditions such as depth, ground condition, and construction pitch. Since it can correspond to the following conditions, it is possible to improve the operating rate of construction equipment and construction efficiency. Additionally, the press-in equipment is fully hydraulic, allowing for noiseless and vibration-free construction.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of a construction machine equipped with an example of a press-fitting device according to the present invention, Fig. 2 is a horizontal sectional view of section E in Fig. 1, and Fig. 3 is a sectional view taken along line FF in Fig. 2. FIG. 4 is a sectional view taken along the line HH in FIG. 3.

Claims (1)

[Scope of Claims] 1. One end of a hydraulic cylinder for mandrel press-fitting is connected to the lower part of the leader, and the other end of the hydraulic cylinder is connected to the center part of a mandrel press-fitting stand that moves up and down along a guide rail attached to the leader, A board characterized in that a plurality of sets of chuck devices each consisting of left and right mandrel clamping chuck bands and hydraulic cylinders for opening and closing the chuck bands are attached to the press-fitting stand so that the mutual spacing between the chuck devices of each set can be adjusted. Mandrel press-fit device for drain construction machines. 2. The mandrel press-fitting device for a board drain construction machine according to claim 1, wherein a connecting portion to which a spare press-fitting stand can be connected is provided at both ends of the press-fitting stand.