JPS6262211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for driving piles with anchor chains into underwater ground using a jack.

Usually, anchors are used when temporarily mooring ships and other floating structures, but when mooring floating structures semi-permanently or on soft ground that is difficult to anchor even when anchored, the anchor pile method is used. It is used.

Conventionally, the method of driving anchor piles on the water bottom is to use a hammer to drive long steel pipe or concrete piles from above the water surface, such that the piles remain above the water surface even after the driving work is completed.
There is a known method in which diving workers cut off the unnecessary extra length left above the underwater ground, and a method in which a flange provided at the top end of the pile and a flange provided at the bottom end of the pile are connected using bolts and nuts. There is also a method in which the pile is hammered into the underwater ground by hitting it with a hammer, and then a diving worker removes the bolts and nuts to break the connection between the pile and the pile, and then recovers the pile. It is being

However, in the case of each of the above-mentioned conventional construction methods, dangerous and complicated diving work is required, and in the case of the method of cutting the extra length of the pile underwater, it is uneconomical because loss occurs due to pile cutting.

The object of the present invention is to provide a method for driving piles with anchor chains that advantageously solves the above-mentioned problems.

Next, the present invention will be explained in detail using illustrated examples.

The drawings show embodiments of the invention,
A mounting bracket 6 connected to the end of the anchor chain 1 is fixed by welding to the outer surface of the upper end of the pile 2 made of a steel pipe, and a impact force transmitting flange 8 and A reinforcing and impact force transmitting rib 9 is fixed by welding, and a reinforcing and insertion guide rib 1 is attached to the outer peripheral surface of the main body 7 below the flange 8.
0 and 11 are fixed by welding to form a rod 3. The lower end of the rod 3 is fitted into the upper end of the pile 2, and the flange 8 is placed on the upper end of the pile 2.

A pair of holding members 12 are provided on the lower outer surface of the Yatsutoko 3.
13 are fixed by welding at intervals in the circumferential direction of the holder, and a horizontal locking plate 14 is fixed by welding across the base end of each holding member 12, 13 and the outer surface of the holder 3. The proximal end of a locking member 15 is pivotally connected to the member 12 by a vertical support shaft 16, and a locking pin 18 connected to a filament 17 such as a wire or synthetic fiber string is connected to the other holding member 13. The chain locking device 4 is configured by the pair of holding members 12, the locking member 13, the locking pin 18, the locking plate 14, and the like.

The anchor chain 1 has each holding member 12, 13
is inserted between the locking member 15 and the locking plate 14,
The lower end of one ring 19 in the chain 1 is engaged with the upper edge of the locking member 15 and the locking plate 14, and the pile 2 and the rod 3 are connected via the chain 1 and the chain locking device 4. are connected.

A pile 2 to which an anchor chain 1 is attached and a shaft 3 having a chain locking device 4 are connected on land or on a work boat to form a long driven object, and the upper end of the shaft in the driven object is constructed. The hook of the part is supported by a crane installed on the work boat, and the workpiece is suspended by the crane onto the underwater ground 5 at a predetermined driving position.

Next, a blow is applied to the upper end of the Yatsutoko 3 with a hammer and the pile 2 is driven into the underwater ground 5 to a required depth, and then the filament 17 is pulled and locked by a winder or by hand on the work boat. The pin 18 is removed from the tips of the holding member 13 and the locking member 15.

Next, the chain 1 is pulled by a winder or the like on the work boat, or pulled and returned repeatedly. In this way, link 19 of the chain
The locking member 15 is pushed in the release direction by the arcuate shoulder and released, and the chain 1 is automatically disengaged from the chain locking device 4, so the connection between the pile 2 and the shaft 3 is broken, but Then, the Yatsutoko can be hoisted onto the work boat and recovered.

The length of the pile rod 3 is determined by the water depth at the driving site and the pile driving depth from the water bottom. Further, the chain locking device 4 is
It is preferable to install it at approximately the center in the longitudinal direction or slightly below the center. Furthermore, there is a hook for lifting and transporting the upper end of Yatsutoko 3 (not shown).
is installed.

When carrying out this invention, the locking plate 14 may be omitted, or a spring may be engaged with the locking member 15 to rotate it in the releasing direction. Furthermore, as the chain locking device, any structure other than that shown in the drawings may be adopted as long as it can be released on the water surface, for example, on a work boat.

According to this invention, by engaging the anchor chain 1 connected to the pile 2 with the chain locking device 4 attached to the jack 3, the anchor chain 1 is used to connect the pile 2 and its upper end. The pile 2 and the pile 3 can be easily connected to the pile 2 and the pile 3 removably fitted to the bottom, and the pile 2 and the pile 3 can be suspended onto the underwater ground 5 by hitting the pile 2 and the pile 2 on the underwater ground 5. After driving to a required depth, the anchor chain 1 can be removed from the chain locking device 4 by simply releasing the chain locking device 4 by operating from above the water surface.
The connection between the pile 2 and the Yatsutoko 3 can be easily released by removing the pile 2 and the Yatsutoko 3, and therefore the connection between the pile 2 and the Yatsutoko 3 can be easily released and the Yatsutoko 3 can be recovered without performing dangerous and complicated underwater work. Furthermore, since there is no loss due to pile cutting, economical effects can be obtained.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Fig. 1 is a partially longitudinal side view showing a state in which Yatsutoko is connected to a pile and driven into the underwater ground; Fig. 2 is a side view showing a state in which an anchor chain is locked to a chain locking device in Yatsutoko; Fig. 3 is a partial cross-sectional plan view of the same, Fig. 4 is a front view thereof, Fig. 5 is a longitudinal sectional front view of the fitting connection part between the pile and the jack, Fig. 6 is a cross-sectional view taken along the line A--A, Figure 7 is the fifth
FIG. 8 is a partially cross-sectional plan view showing a state in which the chain locking device is released. In the figure, 1 is an anchor chain, 2 is a pile, 3 is a rope, 4 is a chain locking device, and 5 is a chain locking device.
is the underwater ground, 7 is the Yatsutoko main body, 8 is a flange for transmitting impact force, 9 is a rib for reinforcing and transmitting impact force, 12
13 is a holding member, 14 is a locking plate, 15 is a locking member, 16 is a support shaft, 17 is a filament, 18 is a locking pin, and 19 is a link.

Claims (1)

[Claims] 1. Connect the pile 2 to which the anchor chain 1 is connected and the yutoko 3 detachably fitted to the upper end of the pile 2 by means of the chain locking device 4 attached to the chain 1 and the yutoko 3, and then 3 to drive the pile 2 into the underwater ground 5, the chain locking device 4 is released by operation from above the water surface to detach the anchor chain 1 from the chain locking device 4, and then A pile driving method with an anchor chain, which is characterized in that the anchor chain is removed from the pile 2.