JPH0534450B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is achieved by driving a U-shaped sheet pile having curved joints on both sides to be connected to other sheet piles into the ground using an earth auger. , relates to a construction method for forming rows of sheet piles.

(Prior Art) The method of driving sheet piles using an earth auger is widely used because it generates little noise.
However, as shown in Fig. 7, this construction method involves fixing a U-shaped frame 3 to the side of a casing 2 that rotatably houses an earth auger drill 1 with screw blades 1a installed around a rotating shaft 1b. The U-shaped frame 3 is fixed to the belly surface of the sheet pile 4 and hung on the engagement protrusion 5, and the earth auger drill 1 is attached to the leader of a pile driver so that it can be raised and lowered (none of these are shown). This is a construction method in which the sheet pile 4 is driven while rotating the vertical hole 6 in the ground.

(Problem to be solved by the invention) However, according to this conventional construction method, the sheet pile 4 is inserted not into the vertical hole 6 itself, but near the vertical hole 6, so the insertion resistance when the sheet pile 4 is inserted is As a result, the driving speed of the sheet pile is low,
The problem is that it is inefficient.

(Means for Solving the Problems) In view of the above problems, the present invention, when forming a row of sheet piles, first drills a first vertical hole corresponding to the width in the arrangement direction of the sheet piles using an earth auger drill, and then A first sheet pile is attached to a casing rotatably housing an earth auger drill, and while a second vertical hole is being drilled by the earth auger drill on the side of the first vertical hole, the earth auger drill is inserted into the casing into the first vertical hole. The attached first sheet pile is inserted, and then a second sheet pile is attached to the casing, and one bending joint part of the second sheet pile is connected to one bending joint part of the first sheet pile. While the third vertical hole is drilled on the side of the second vertical hole with an earth auger drill, the second sheet pile is inserted into the second vertical hole. , ... is characterized by forming a row of sheet piles embedded in the ground by repeatedly performing the sheet piles, and the sheet piles are inserted into vertical holes that have already been drilled. Therefore, the insertion resistance of the sheet pile is reduced, and the work of driving the sheet pile can be carried out efficiently.

(Example) Fig. 1 is a process diagram showing an embodiment of the construction method according to the present invention. First, as shown in A, an earth auger drill 1 is used to drill a first
A vertical hole 7a is excavated. Earth auger drill 1
As shown in FIG.
As shown in Figures 2 and 6, there is a casing 2 at the lower end.
It has a more protruding drilling head drill 1c. As mentioned above, the casing 2 rotatably houses the earth auger drill 1, and the motor 1 attached to the lower part of the drill drive device 10.
It is detachably connected to a rotary body 12 rotated by a rotor 1 . Then, the earth drill 1 is gradually lowered together with the casing 2 while being rotated by the drill drive device 10, and the excavated earth and sand are raised inside the casing 2 and are deposited on the ground through the earth removal opening 2a provided in the casing 2. It is something that is discharged.

After drilling the first vertical hole 7a, as shown in FIG. 1B, the first sheet pile 4A is attached to the casing 2, and the second While drilling the vertical hole 7b, a first hole attached to the casing 2 is inserted into the first vertical hole 7a.
Insert the sheet pile 4A.

In this embodiment, symmetrical joints a and b are provided on the side surface of the lower end of the casing 2 and can be slidably fitted into either of the curved joints 4a and 4b on both sides of the sheet pile.
The fitting piece 13 having the following is provided, and the holding of the sheet pile 4A is as follows.
One joint part a of the fitting piece 13 is fitted to the lower end part of one curved joint part 4b of the sheet pile 4A, and the upper end part of the sheet pile 4A is held by the gripping device 15 shown in FIGS. 3 to 5.
This is done by grasping the object with a hand.

Here, the gripping device 15 of this embodiment will be explained with reference to FIGS. 3 to 5. Reference numeral 17 denotes a split band that is detachably and rotatably attached to the casing 2, and split bands 18 and 19 for positioning the band 17 are detachably fixed and attached above and below the split band 17. The divided band 17
has a guide frame 28 in the vertical direction, and the gripping device 15
The frame 16 has a sliding frame 29 that is slidably fitted into the guide frame 28, and a hydraulic cylinder 30 for raising and lowering the frame 16 is interposed between the upper split band 18 and the frame 16. The frame 16 can be moved up and down by expanding and contracting the hydraulic cylinder 31. A hydraulic motor 33 is attached to the upper split band 18, and its output gear 32 is meshed with the gear 31 attached to the split band 17. 33 makes it possible to rotate the frame 16 within a limited range. Furthermore, two rails 20 are fixed in the frame 16 in the tangential direction of the band 17, and a movable frame 22 having rollers 21 that roll along the rails 20 is attached to the end surface of the frame 16. connected to the piston rod 23a of the hydraulic cylinder 23,
The movable frame 22 is configured to move along the frame 16 by the expansion and contraction of the hydraulic cylinder 23.
A scissor-shaped holder 25 is attached (2
Reference numeral 7 designates a tension spring that holds the holder 25 vertically.) By expanding and contracting a hydraulic cylinder 26, the holder 25 can grip and release the sheet piles 4.

When gripping the sheet pile 4 using this gripping device 15, first, the hydraulic motor 33 is activated and the frame 16 is
is evacuated from the driving position of the sheet pile 4, the sheet pile 4 is lifted using the auxiliary lifting mechanism (not shown) of the pile driver 8, and while lowering the sheet pile 4, the fitting piece 13 at the lower end of the casing 2 is removed. The curved joint part b of the sheet pile 4 is fitted into the joint part a, and the hydraulic motor 33 is operated so that the frame 16 is placed above the sheet pile 4 and the holder 25 is positioned directly above the sheet pile 4. The hydraulic cylinder 23 is operated, and then the hydraulic cylinder 30 is extended to lower the holder 25 to a position where the sheet pile 4 can be held between them, and the hydraulic cylinder 26 is extended to hold the sheet pile 4 between the holders 25.

Further, in this embodiment, a vertical hole collapse prevention plate 14 having an arc shape with a protruding width similar to the protruding width from the casing 2 of the head drill 1c is attached to the lower end of the casing 2, and the sheet pile 4A is inserted into the first vertical hole 7a.
When the second hole 7b is drilled by the drill 1, the plate 14 is inserted into the first vertical hole 7a to prevent the already drilled vertical hole 7a from collapsing.

Through such work, a first hole is formed in the first vertical hole 7a.
After driving the sheet pile 4A, the casing 2 and drill 1 are pulled out, and as shown in FIG. 1C,
A second sheet pile 4B is attached to the casing 2 by the above-described mechanism, and one curved joint portion 4a of the second sheet pile 4B is fitted into one curved joint portion 4b of the first sheet pile 4A. In this state, while drilling a third vertical hole 7c on the side of the second vertical hole 7b with the earth auger drill 1, insert the second sheet pile 4B into the second vertical hole 7b. The process is repeated for sheet piles 4C, 4th sheet pile 4D, and so on. This forms a row of sheet piles embedded in the ground.

Note that, as in this embodiment, the sheet piles 4 are held in the holder 2.
5 and a fitting piece 13, and the direction of the sheet pile 4 is controlled by the motor 11 to rotate the sheet piles 4A, 4B,
By controlling the position before driving so that the 4C, .

Note that when carrying out the present invention, the gripping device 15
It goes without saying that the specific mechanical configuration can be changed in various ways, such as being able to be attached to the drill drive device 10 side.

(Effects of the Invention) As described above, according to the present invention, the sheet pile is driven by inserting the sheet pile into a vertical hole that has already been excavated, so the insertion resistance of the sheet pile is reduced, which is different from the conventional one. You can drive sheet piles in about half the time. Therefore, the problem of efficiency, which was a drawback of the construction method using earth augers, can be solved.
It is possible to take advantage of the advantage that the generated noise is small.

[Brief explanation of drawings]

Figure 1 A, B, and C are plan views showing an embodiment of the construction method according to the present invention, Figure 2 is an overall view showing an embodiment of the construction method according to the present invention, and Figure 3 is a sheet pile holder used in this implementation. Side view showing an example of the device, No. 4
The figure is a horizontal cross-sectional view showing the sheet pile holding device, FIG. 5 is a vertical cross-sectional view showing the holder of the sheet pile holding device, and FIG.
The figure is a side view showing the lower end of the earth auger drill and casing used in this embodiment, and FIG. 7 is a plan view illustrating the conventional construction method.

Claims (1)

[Claims] 1 When driving a U-shaped sheet pile into the ground that has curved joints on both sides that connect to other sheet piles, first use an earth auger drill to drill a first vertical hole corresponding to the width of the sheet pile in the direction in which the sheet piles are arranged, and then A first sheet pile is attached to a casing rotatably housing an earth auger drill, and while a second vertical hole is being drilled by the earth auger drill on the side of the first vertical hole, the earth auger drill is inserted into the casing into the first vertical hole. The attached first sheet pile is inserted, and then a second sheet pile is attached to the casing, and one bending joint part of the second sheet pile is connected to one bending joint part of the first sheet pile. While the third vertical hole is drilled on the side of the second vertical hole with an earth auger drill, the second sheet pile is inserted into the second vertical hole. A driving method for U-shaped sheet piles, characterized by forming rows of sheet piles embedded in the ground by repeatedly performing the driving on the sheet piles of ,....