JP2511067B2 - Underwater sand pile driving method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an underwater sand pile driving method for constructing and compacting sand piles in soft ground such as the seabed.

(Conventional technology) The conventional underwater sand pile driving method is to raise and lower the vibrating pile driver by the guidance of the leader on the hull, and to move it from the top of the hull to the sand loading hopper arranged under the vibrating pile driver. The sand bucket is moved up and down to supply the sand, and the tubular pile suspended by a vibrating pile driver is driven into the soft ground below the bottom of the water. It is a vibrating sand pile compaction method (sand compaction method) in which sand is extracted from the tip of the pile into soft ground and is compacted by vibration. Water inflows into the tubular piles, sand is dropped due to water content, and the sand is compacted. The vibrating pile driver and sand hopper are used on the surface of the water because they are difficult to harden.

(Problems to be Solved by the Invention) In the conventional underwater sand pile driving method, the vibrating pile driving machine and the sand loading hopper cannot be lowered into the water, and the lengths of the tubular pile and the leader on the hull are long. However, compared to the construction length below the bottom of the water, the length of the construction is increased by the depth of water, the machine becomes larger and the equipment cost increases, and the construction efficiency decreases when construction is carried out on deep seas near the airport as in recent years. There is a problem.

When the vibrating pile driver and sand hopper are placed underwater, it is difficult to supply sand to the sand hopper underwater and it has not been put to practical use.

When sand is supplied from the sand bucket to the sand input hopper in water, water flows into the sand input hopper and the water content ratio of sand increases.
Sand adheres to the inside of the sand bucket, sand hopper, and tubular pile, making it difficult to extract sand from the tip of the tubular pile into the soft ground by vibration and to compact it by vibration, improving the quality of the sand pile and improving it. There are problems such as strength being a problem.

(Means for Solving Problems) The present invention is an underwater sand pile driving method developed in view of the above situation, and a vibrating pile driving machine that is moved up and down by the guidance of a leader on a hull, and the vibration. Soft ground with a bottom of the pile, equipped with a sand hopper that is placed below the pile driver and that throws sand into the tubular pile, and a sand bucket that is moved up and down from the hull to convey the sand and supply the sand to the sand hopper. In the vibration type sand compaction method of constructing sand piles inside, while operating by placing it in water using an underwater vibration type pile driver, a sand bag using an impermeable bag is transported by the sand bucket and By supplying to the sand feeding hopper and sealing the sand receiving inlet of the sand feeding hopper with the upper lid, by throwing the sand bag into the tubular pile by the sand feeding hopper to create the sand pile in the soft ground. , Supply sand to the water input hopper for making sand bags using water-impermeable bags. Both of them are underwater vibration type pile driver, which enables underwater operation.
By improving the construction operability and efficiency as well as construction reliability, the above-mentioned problems are eliminated.

(Operation) A submerged vibration type pile driver is placed in water, and a sand bag using a water impermeable bag is placed in a sand bucket in a sand loading hopper under the submersible vibration type pile driver. When it is transported and supplied, and the sand supply port of the sand input hopper is closed with the upper lid, most of the water in the sand input hopper is discharged by the supply of the sand bag, and water ingress into each sand bag occurs. Prevented, when operating the underwater vibration type pile driver in water to put the sand bag in the sand input hopper into the tubular pile, the sand bag is smoothly lowered in the tubular pile due to the moderate weight of the sand bag, It is extracted from the tip of the tubular pile into the soft ground, the impermeable bag is broken by vibration, the sand is sufficiently vibration-compacted and the sand pile is constructed, and the sand is effectively attached with almost no adhesion of sand. The construction length is increased to a considerable extent, and variations in construction are eliminated.

(Embodiment) One embodiment of the present invention is shown in FIGS. 1 to 4, in which (2) is a leader erected on the hull (1), and the vibrating pile driver (3) is The underwater vibration type pile driver (3) is capable of vibrating in water, and the underwater vibration type pile driver (3) guides the leader (2) from above the hull (1) with the lifting wire (14) through the shock absorber (10). It is lifted and lowered by a sand hopper (4) disposed below the underwater vibration type pile driver (3), the tubular pile (5) is connected and hung, and on the hull (1). A sand bucket (6) that is lifted up and down by a lifting wire (7) is provided, and a sand loading chute (8), a transfer conveyor (9), and the like are arranged on the hull (1), and the hull (1) A vibrating pile driver (3) that is moved up and down by the guidance of the upper leader (2) and sand is placed in a tubular pile (5) that is arranged below the vibrating pile driver (3). It is equipped with a charging hopper (4) and a sand bucket (6) that is moved up and down from the hull (1) and conveys sand to supply it to the sand charging hopper (4), and a sand pile is placed in the soft ground (g) at the bottom of the water. In the vibrating compaction method to be constructed, the underwater vibrating pile driving machine (3) is used to operate by placing the sand bag (a) using the water impermeable bag (a ₁ ) in the sand bucket (6). ), And supplies it to the sand loading hopper (4) in the water to seal the sand receiving port (4a) of the sand loading hopper (4) with the upper lid (11), and then to the sand bag (4) by the sand loading hopper (4). Insert a) into the tubular pile (5) to create a sand pile.

The sand bag (a) is sealed by filling the impermeable bag (a ₁ ) with sand (s), and the water impermeable bag (a ₁ ) prevents water from invading the sand bag. It is formed in a proper size and weight so as to facilitate the transportation by (6), the supply into the sand charging hopper (4), the charging into the tubular pile (5), and the drop.

As shown in FIG. 2, the sand bucket (6) is provided with a take-out lid (15) operated by a fluid pressure cylinder (16) at a lower side thereof and has an inclined bottom surface to supply the sand bag (a). Smoothly, the sand input hopper (4) has a sand receiving port (4
a) has an upper lid (11) for sealing which is operated by a fluid pressure cylinder (12), and a lower lid (13) which is operated by an appropriate remote control means at the inlet of the lower end. ing.

As shown in FIGS. 1 and 2, the underwater vibration type pile driver (3).
Is placed in water (w) to operate, and the shock absorber (10) damps and prevents vibration propagation to the hull (1) side.

The sand supply to the underwater sand input hopper (4) is performed by the sand bag (a).
When the sand bucket (6) is lowered to a position near the sand receiving port (4a) of the sand input hopper (4), the lower lid (13) loads the lower end. Close the mouth, open the upper lid (11) with the fluid pressure cylinder (12) and open the sand receiving opening (4a), and use the fluid pressure cylinder (16) with the extraction lid (1
5) is opened and the sand bag (a) is supplied into the sand receiving port (4a) (see FIG. 3).

The sand bag (a) is almost filled in the sand input hopper (4), and the water in the sand input hopper (4) is prevented from flowing into the tubular pile (5) by the lower lid (13). Along with
Almost drained by replacing the sand bag (a), and the upper lid (11)
If the sand receiving port (4a) is sealed with, the amount of water in the sand input hopper (4) is extremely small and is not particularly hindered for sand pile construction.

In addition, the sand feeding hopper (4) is provided with a water draining means (not shown) of an appropriate mechanism, and when the construction length is long,
When the number of times sand is supplied is large, the sand in the sand hopper (4) is drained after the sand supply is completed.

With the operation of the underwater vibration type pile driver (3) placed in the water, the lower lid (13) is opened as shown in Fig. 4 and the sand bag (a) is opened.
Are sequentially loaded into the tubular pile (5), during which the sand bucket (6) is raised to receive and store the sand bag (a) from the sand loading shooter (8) on the hull (1).

Since the sand is carried by the sand bag (a) using the water impermeable bag (a ₁ ), the sand is supplied into the sand feeding hopper (4) and is fed into the tubular pile (5), the water impermeable bag (a) is used. _{In 1} ), sand is prevented from adhering to each part, and the water content of sand is prevented.
When the sand bag (a) is smoothly supplied and dropped and the sand bag (a) is extracted from the tip of the tubular pile (5) into the soft ground (g) and vibrated, the impermeable bag (a ₁ ) is broken, The impermeable bag will not be used, and it will be constructed into a fully compacted sand pile.

As described above, the underwater operation of the underwater vibration type pile driver (3), the sand supply in the water and the sand pile construction are performed easily and quickly, and the construction length corresponding to the water depth can be increased compared to the conventional example. The proximity of the vibration type pile driver to the bottom of the water enhances the workability, work reliability and work efficiency.

As the drainage means, an opening / closing valve is provided at the bottom of the sand feeding hopper to supply compressed air to the inside for draining, and the fluid cylinder and the lower lid are opened / closed by an appropriate means. It It can be operated by hydraulic pressure, hydraulic pressure or atmospheric pressure.

(Advantages of the Invention) The present invention is configured as described above, and by carrying in, supplying, and charging sand with a sand bag using an impermeable bag, and using an underwater vibration type pile driving machine, With the operation of the machine placed in the water, the sand is smoothly supplied and put into the water, and the construction length is greatly increased, and the construction operability, construction reliability, construction efficiency, etc. are significantly improved.

Although the present invention has been described with reference to the embodiments, the present invention is, of course, not limited to such embodiments, and various design modifications can be made without departing from the spirit of the present invention. .

[Brief description of drawings]

FIG. 1 is a side view of an underwater sand pile driving state showing an embodiment of the present invention, and FIGS. 2, 3 and 4 show operating states of carrying, supplying and dropping a sand bag underwater. FIG. 1: Hull, 2: Leader, 3: Underwater vibration type pile driver 4: Sand input hopper, 4a: Sand inlet, 5: Tubular pile 6: Sand bucket, 11: Top lid, a: Sand bag a ₁ : Impermeable Sex bag

Claims (1)

(57) [Claims] 1. A vibrating pile driver that is moved up and down by the guidance of a leader on the hull, a sand feeding hopper that is arranged below the vibrating pile driver and that throws sand into a tubular pile, and is raised and lowered from above the hull. It is equipped with a sand bucket that conveys sand to the sand input popper and arranges it in water using an underwater vibration type pile driver in the vibration type sand pile compaction method for creating sand piles in soft ground at the bottom of the water. The sand bag using a water-impermeable bag is conveyed by the sand bucket and supplied to the sand loading hopper in water to seal the sand receiving port of the sand loading hopper with the upper lid, and then the sand loading hopper is used. An underwater sand pile driving method, wherein the sand bag is put into the tubular pile to form the sand pile in soft ground.