JPS6026889B2 - Sheet pile press-in device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press-fitting device for press-fitting sheet piles into the ground by pre-boring with an earth auger.

Sheet piles are used in many applications such as civil engineering, foundations for construction work, mountain retaining, seawalls, and quay closures, but due to recent pollution regulations, their construction requires the use of drop hammers, diesel hammers, etc., which produce noise and vibration. In place of method 2, pre-boring methods using earth augers and press-in methods using hydraulic pressure are being developed, which have relatively low noise and vibration, but they have advantages and disadvantages and lack a definitive solution.

In particular, when press-fitting sheet piles with joints, ground resistance is a major problem. The press-in devices of these two inventions perform pre-boring with an earth auger before pressing in the sheet piles to reduce the press-in resistance at the time of press-in the sheet piles, and use the earth auger penetrated and fixed into the ground as an anchor as a source of reaction force for press-in. The purpose of the present invention is to provide a press-in device that is not related to its own weight unlike press-fit devices used in conventional construction methods, can utilize a high press-in force, and is efficient in press-fit work. The present invention will be described in detail below with reference to illustrated embodiments.

FIG. 1 is an overall view of this device. A main mast 1 into which sheet piles are press-fitted and an earth auger 2 which moves up and down along the main mast are connected to the tip of the boom. main mast 1
As shown in FIGS. 1 and 2, its upper end is rotatably attached to the tip of the boom via a rolling mast 3 and a top mast adapter 4, and an upper guide 5 is attached to its center. FIG. 3 shows the upper guide 5. This has a guide surface with a U-shaped cross section that is about 1 inch wider than the inside of the sheet pile, and the side edge of the sheet pile passes along the guide surface, which prevents the sheet pile from becoming cluttered during press-fitting. As shown in FIG. 4, the lower end of the main mast 1 is connected to an undermast adapter 6 by a mating flange, and a lower guide 7 and a chucking machine 8 are attached to this. The lower guide 7 attached to the undermast adapter 6 has the cross-sectional structure shown in Fig. 5, and has a U-shaped cross section that prevents the sheet pile from tilting, and has two elevation oil jack cylinders on each side. A chucking machine 8 located at the lower end of the chucking machine 9 can be raised and lowered by hydraulic pressure. As shown in Fig. 6, the chucking machine 8 has a U-shape that can grip the sheet pile from both sides, and has a hydraulically operated movable support plate 10 and a fixed acupressure plate 1.
1 is provided on both sides, and the sheet pile is fixed between the guide shafts 12.
It moves up and down using hydraulic pressure along the road, and works to press the sheet pile into the ground. The lower end of the undermast adapter 6 is extendably connected to a guide lock 14 via a mast jack cylinder 13 using hydraulic pressure, and the guide lock 14 penetrates into the ground using hydraulic pressure to fix the mast tip. The earth auger 2 is supported by two auger guides 15 provided on the main mast 1, and is connected to the tip of the boom by a wire so that it can be raised and lowered parallel to the main mast 1 at a predetermined distance. Also Earth Auger 2
An auger lock 16 that can stop the rotation of the earth auger 2 is installed on the main mast 1, and locks the rotation of the earth auger 2 that has penetrated into the ground. This is a mechanism that allows you to use Earth Auger 2. The structural functions of the main parts of the apparatus according to the present invention are as described above, and an embodiment of press-fitting concrete sheet piles using this apparatus will be described next.

FIG. 7 is a diagram showing the press-fitting position of the sheet piles.

First, the sheet pile 18 to be inserted is set in the sheet pile 19 which has already been press-fitted so that one joint part is iron-fitted and the other joint part matches the hole already pre-bored by the earth auger. Next, the tips of the guide lock 14 and the earth auger 2 are positioned so that they are lined up on the center line of the press-fit sheet pile 18. At this time, the main mast 1 is rotated by up to 180 degrees due to the movement of the boom tip and the rolling mast 3. Align. Subsequently, the oil jack in the undermast adapter 6 penetrates the guide lock 14 into the ground to bear pressure, thereby fixing the tip of the main mast 1. After confirming the vertical accuracy of the main mast by operating the boom, the earth auger 2 is penetrated into the ground.

The earth auger 2 descends along the auger guide 15 attached to the main mast 1 while keeping a predetermined distance from the main mast 1, and the penetration position matches the joint part of the next press-fit sheet pile. After penetration, the rotation of the earth auger 2 is locked by an auger lock 16 to resist withdrawal. For press-fitting, the sheet pile is clamped and fixed between a movable bearing pressure plate 10 and a fixed bearing pressure plate 11 using a chucking machine 8, and the elevation lever 9 is operated to press-fit the sheet pile along the guide shaft 12 to the maximum stroke.

In this case, the earth auger 2, which is fixed in the ground, is connected to the main mast 1 via the rope at the upper end and the tip of the boom.
Acts as a source of press-in reaction force and enables press-fitting with high pressure. Subsequently, the chucking machine 8 is opened, the oil jack is returned to raise the sheet pile, the sheet pile is clamped again, and the elevation oil jack 9 is operated to perform press-fitting. Repeat this until the sheet pile is pressed in all the way to the end. When the press-fitting of the sheet piles is completed, the auger lock 16 is released and the earth auger 2 is pulled out and turned off.Then, the oil jack stress in the undermast adapter 6 is released and the next sheet pile is press-fitted.

In this case, the excess portion of the hole that was pre-bored two cycles ago and into which the sheet pile joint was press-fitted may be stabilized by filling it with soil cement or soil cement, which is made by mixing soil scales with a solidifying agent. The sheet pile press-in device of this invention uses an earth auger penetrated into the ground and fixed as an anchor as a reaction force source for sheet pile press-in, but if necessary, a wire at the tip of the foot is used to take an anchor to an existing sheet pile in the distance. Sometimes.

Also, a wire at the tip of the boom is used to suspend the sheet piles, but if the weight is large, it may be necessary to use a truck crane to suspend the sheet piles. The sheet pile press-fitting device of the present invention has the above configuration.

This equipment first performs pre-boring with an earth auger to reduce the press-fitting resistance of the sheet pile, and then uses an earth auger that penetrates into the ground and locks its rotation with an auger lock as a source of reaction force for press-fitting. When press-fitting, this device uses a chucking machine to clamp both surfaces of the sheet pile and press-fit it, so even long sheet piles can be easily press-fitted by repeatedly holding and press-fitting a unit stroke length without using particularly expensive press-fitting equipment. . In addition, since the guide has a guide surface with a U-shaped cross section and prevents the sheet pile from tilting, the accuracy of folding is also good. In addition, when this device is attached to an upper support such as a boom, the mast can be rotated freely,
By combining the guide lock that fixes the mast with the earth auger that moves up and down in parallel, sheet piles can be press-fitted over a wide range by moving the foot without moving the entire equipment. Therefore, the working time can be reduced compared to the existing equipment that requires moving the equipment each time a sheet pile is inserted. Furthermore, it has the advantage that sheet piles can be inserted into locations where sheet pile press-in equipment cannot be carried in by extending the boom from a remote location and press-fitting the sheet piles.

[Brief explanation of drawings]

Fig. 1 is an overall view of the sheet pile press-fitting device according to the present invention, Fig. 2 is a front view of the upper part of the main mast, Fig. 3 is a sectional view of the upper guide, Fig. 4 is a front view of the lower part of the main mast, and Fig. 5 is a front view of the upper part of the main mast. 6 is a sectional view of the lower guide, FIG. 6 is a sectional view of the chucking machine, and FIG. 7 is a sheet pile setting position diagram. 1...Main mast, 2...Earth auger, 3...Rolling mast, 4...Top mast adapter, 5...Upper guide, 6...Undermast adapter, 7...Lower guide, 8...Chatting machine, 9...Elevation oil tank Tsuki, 10... Movable pressure bearing plate, 11... Fixed pressure plate, 12... Guide shaft, 113... Mast jack, 14... Guide lock, 15... Auger guide, 16... Auger lock, 18... Shoiri Sheet pile, 19・
...Press-fitted sheet pile. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. It has a vertical mast whose upper end is rotatably attached to an upper support body around an axis, and an earth auger which ascends and descends parallel to this mast and is suspended from the upper support body at its upper end, The mast has a sheet pile guide with a U-shaped guide surface through which the side edge of the sheet pile to be press-fit passes, a chucking machine that grips the sheet pile from both surfaces and moves up and down along the mast, and a chuck machine that penetrates into the ground. A sheet pile press-fitting device characterized in that the mast tip has a guide lock for fixing the position of the mast tip, and the earth auger has an auger lock for locking its rotation.