JPH0420446B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is applicable to steel sheet piles and H-shaped steel piles to be erected,
In order to restrain steel pipe piles (hereinafter referred to as "steel sheet piles, etc.") along with the auger casing of the earth auger, the upper part of the steel sheet piles, etc. can be gripped by a hydraulic chuck, making noiseless and vibration-free press-fitting of steel sheet piles, etc. In particular, the present invention relates to a device for restraining the lower part of steel sheet piles, etc.

<Prior Art> The conventional technology will be explained below, taking the case of steel sheet piles as an example.

Driving steel sheet piles with a diesel hammer or vibrohammer causes excessive noise and vibration, making it almost impossible to use in urban areas. Set on the outer surface of the auger casing,
After pressing the steel sheet pile into the soil to a specified depth while excavating with an earth auger, the earth auger is rotated in the opposite direction and pulled out while backfilling, but the steel sheet pile is left in place, and the same operation is repeated thereafter. Repetitive noise-free and vibration-free work signals are conventionally known.

If only the upper end of the steel sheet pile is held and the lower end is left free, excessive force will be applied to the steel sheet pile during press-fitting, which may cause problems such as twisting and buckling. Therefore, in the past, a downward-facing locking fitting was fixed in advance to the lower end of the auger casing so that even if it was integrally restrained with the auger casing during press-fitting, the restraint could be released when pulling out the earth auger. Engagement fittings that fit with the above-mentioned locking fittings were attached by on-site welding to each steel sheet pile to be erected.

<Problems to be solved by the invention> As mentioned above, in order to attach fittings for engagement to each steel sheet pile by on-site welding, an extra crane is required to re-hang the steel sheet piles, and the fittings Not only does it add up to a considerable amount of money if you include the cost of welding and welding, but also because steel sheet piles are usually leased items, the welded parts must be cut and removed after use and returned. This had the disadvantage of increasing costs even further.

The present invention has been made to solve the above-mentioned drawbacks.

<Means for Solving the Problems> The present invention makes the lower edge of steel sheet piles, etc. an engagement point in place of the conventional engagement fittings, thereby reducing the time and effort required to weld or cut and remove the fittings. We have come up with the idea that it is possible to omit the . Even when the lower end edge of a steel sheet pile or the like is used as an engagement point in this way, it must be able to be securely restrained integrally with the auger casing during press-fitting, and yet the restraint must be released when the earth auger is pulled out. Therefore, in the present invention, two rods each having a hook part formed at the lower end for receiving the lower edge of the steel sheet pile, etc. are installed in the auger casing, and the above-mentioned hook part is installed by a hydraulic jack for raising and lowering the rods. By making it possible to push down the rod below the lower edge of the steel sheet pile, and by turning the direction of the pushed down hook part in a direction that does not engage with the steel sheet pile, etc., using the rotating means of the rod. , the intended purpose has been achieved.

<Example> In FIG. 1 showing an example of the present invention, a pile driver 1 has a leader 3 vertically held by a stay 2, etc., and an earth auger excavation device 4 that can be raised and lowered along the leader 3 drives a pile. It is suspended and supported by a hanging wire 6 extending from a hanging drum 5 of the machine 1. Although not shown, the pile driver 1 is provided with a squeezing drum separate from the lifting drum 5, and the earth auger excavation device 4 can be pulled downward by a squeezing wire extending from the drum.

The earth auger excavation device 4 includes, in addition to a rotation drive device for the auger screw 7, a turning device that allows the auger casing 8 surrounding the outside of the auger screw 7 to be rotated at an arbitrary angle, and an auger casing as described later. In order to press in the steel sheet piles 9 attached to the steel sheet piles 8 as needed, the steel sheet piles 8 are usually provided with a pushing device consisting of a hydraulic cylinder. A hydraulic chuck 10 for gripping and releasing the upper end of the suspended steel sheet pile 9 is attached to the upper part of the auger casing 8 as a convenient mounting means for changing its fixing position according to the length of the steel sheet pile 9 used. It is installed side by side. The steel sheet pile 9 gripped by the hydraulic shaft 10 can be set in a direction to properly mesh with the existing steel sheet pile by the turning device. Up to the point described above, there is no difference from the conventional one.

The lower restraint device according to the present invention is installed alongside the above-described device, and the details are as follows.
Two annular members 11 and 12 are arranged in the upper part of the auger casing 8 to which the hydraulic chuck 10 is attached, one annular member 11 is fixed to the auger casing 8, and the other annular member 12 is The annular members 11 and 12 are connected by two hydraulic cylinders 13 and 13 provided parallel to the longitudinal direction of the auger casing 8. Movable annular member 1
The brackets 15, 15 for the rods 14, 14 are fixed to the rods 14, 14, and in cooperation with the locking nuts 16, 16, the two rods 14, 14 cannot fall off or come out, but can be rotated freely. Hold it like this.
In this way, the two rods 14, 14 can move up and down by a length corresponding to the stroke of the hydraulic cylinders 13, 13.

The movable annular member 12 also includes a rod 14,
Fourteen rotating means 17, 17 are attached. 1st
The rotating means 17, 17 shown in the figures and FIG. It is pivotally connected to arms 18, 18 fixed to rods 14, 14 so as to be freely rotatable. Therefore, hydraulic cylinder 1
7a, 17a, the force for rotating the rods 14, 14 is transmitted via the arms 18, 18,
The rods 14, 14 will be rotated, for example, by 90°.

The rotation means 17 may be a means other than the above-mentioned hydraulic cylinder 17a. In the example shown in FIGS. 5 and 6, a sleeve 17c having a spiral cam groove 17b formed on the inner surface is attached to the auger casing 8.
On the other hand, the rod 14 has the cam groove 17b.
By providing a protruding cam roller 17d that engages with the rod 14, when the rod 14 is lowered by the hydraulic cylinder 13, the hook portion 19, which had previously faced the front, turns to the side, and conversely, the rod rises. When doing so, the hook portion 19, which had been facing sideways, now faces forward.

The two rods 14, 14 have a length that extends further below the lower end of the auger casing 8,
At its lower end there is a hook-shaped hook 1.
9 and 19 are formed. This hook part 19,1
9 is a portion that engages with and restrains the lower edge of the steel sheet pile 9. If necessary, in order to make the restraint even stronger, a contact plate 20 (see Fig. 2) is welded to the lower end of the auger casing 8, and the rods 14, 1
The steel sheet pile 9 may be pressed against the backing plate 20 with the hook portions 19, 19 of 4 engaged with the lower edge of the steel sheet pile 9. Rods 14 and 14 are long, so
For example, a guide collar 21 may be welded to the annular member 11, or a similar collar may be welded to appropriate locations on the auger casing 8 for guidance. In addition, if the two annular members 11 and 12 are constructed in two halves connected by a hinge, and the abutting surfaces are tightened with bolts, the two annular members 11 and 12 may be separated depending on the length of the steel sheet pile 9 used. It is convenient because it is easy to change the mounting positions of 11 and 12. In the figure, 22 indicates a hinge structure for this purpose.

Next, to explain how to use it, when grasping the suspended steel sheet pile 9 with the hydraulic chuck 10, as shown in Fig. 2, the two rods 14, 14 are positioned at the bottom, and if necessary, the The rib portions 19, 19 are also oriented to face each other. Next, the rotation means 17,
The hydraulic cylinders 17a, 17a are operated to direct the hooks 19, 19 to the front as shown in FIG. Tightly restrain the lower edge of the After the steel sheet piles 9 have been built to a predetermined depth, the earth auger can be pulled out after performing the operations in the reverse order as described above. The same thing can be said for H-shaped steel piles and steel pipe piles instead of steel sheet piles.

<Effects of the Invention> As is clear from the above explanation, since the lower restraint device of the present invention restrains the lower edge of steel sheet piles, etc., it is not necessary to weld an engagement fitting to the steel sheet piles as in the conventional case. It is highly economical in that it does not require the labor of cutting or removing it or an extra crane, and it also has the advantage of being relatively easy to install into conventional press-fitting equipment for steel sheet piles, etc. Because of this, it is extremely effective in significantly improving conventional work efficiency.

[Brief explanation of drawings]

Fig. 1 is an overall view of a steel sheet pile press-in device using the device of this invention, Fig. 2 is a front view showing the main parts of the lower restraint device of this invention, and Fig. 3 is a rod hooking the lower edge of the steel sheet pile. FIG. 4 is a side view showing a state in which the rods are restrained by the auger casing, and FIG. 4 is a cross-sectional view showing the mutual positional relationship of the auger casing, the steel sheet pile, two rods, and their hooks. Figures 5 and 6 are front and side views of another rod rotating means. 1...Pile driver, 3...Leader, 4...Earth auger excavation device, 7...Auger screw,
8...Auger casing, 9...Steel sheet pile, 10
... Hydraulic chuck, 11, 12 ... Annular member, 1
3... Hydraulic cylinder, 14... Rod, 15...
Bracket, 16... Lock nut, 17... Rotating means,
18... Arm, 19... Hook portion.

Claims (1)

[Claims] 1 In a noise-free and vibration-free press-in device for steel sheet piles, etc., in which the upper end of the steel sheet piles, etc. 9 to be erected can be gripped by the hydraulic chuck 10 attached to the auger casing 8 of the earth auger, the hydraulic cylinders 13, 1
Two annular members 11 and 12 connected at 3 are attached to the auger casing 8, one fixed and the other slidably attached, and the slidable annular member 12 has two annular members extending along the auger casing 8. Rod 1
4, while holding the upper end portion of 14 rotatably,
Rotating means 17, 17 for rotating the rods 14, 14 are attached to the lower end portions of the rods 14, 14, hook portions 19, 19 capable of engaging with the lower edge of the steel sheet piles 9, etc. A lower restraining device for a press-fitting device for steel sheet piles, etc.