JP2500115B2 - Underwater drilling method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater excavation method and apparatus for constructing a pile-to-pile arrangement for box foundation piles that are cast in rows.

[0002]

2. Description of the Related Art As shown in FIG. 19, a pile foundation pile is driven by placing a pile pile k on the ground surface f below the trench dredging surface t from the sea surface s and then at a height h1 from the trench dredging surface t. The upper portion a1 is cut and removed while leaving the pile head a (for example, 0.5 m).

However, as shown in FIG. 20, due to the process, before the trench dredging, the foundation k is placed below the sea floor b in the state after cutting and removal shown in FIG. 19, and then from the pile head a. The portion x up to the height h2 (for example, 2 m) is roughly dug, and the remaining portion Y up to the trench dredging surface t is subjected to finishing dredging, so-called pile clearance.

[0004]

When mechanically excavating a conventional pile gap, the pile head a may be damaged and deformed. Since a pile head cap (not shown) is attached to the pile head a, damage and deformation must be avoided. As a result, workability is reduced.

An object of the present invention is to provide an underwater excavation method and apparatus for improving the workability without damaging and deforming the pile head and constructing the inter-pile roughness.

[0006]

In the method according to the present invention, the inside and outside of the heads of four pairs of two rows of piles driven by diving work are excavated and then mounted on the base of the excavator. The pair of supporting fixed legs is lowered and fixed to two pairs of inner four pairs of piles, and the outer portion of the row of piles is level-excavated by the excavator provided on the platform and is movable with respect to the platform. An outer frame is provided with a pair of movable front fixed legs at the end of an expandable inner frame, and a pile around excavator is level- excavated around the pile near the excavator to form a tubular shape around the pile. The unexcavated part and the inside of the pile head are covered with a mouse provided on the moving front fixed leg, the unexcavated part is left to be excavated by jet water, and a pair of movable fixed legs provided at the end of the outer frame. And fix it to the rest of the piles to support the excavator together with the other fixed leg for movement. After unfastening and lowering the two fixed legs for support, the gantry is moved to the excavator side around the pile with respect to the outer frame, and the two fixed legs for support are positioned above the pile at one pitch, The above procedure is repeated to perform level excavation around the outer circumference of the pile.

The apparatus according to the present invention comprises a gantry, an excavator provided on the gantry and having a cutter drum on an arm capable of undulating, sliding and rotating, and an elevator provided on the gantry and having a stopper and a gripper at its lower end. A pair of supporting front and rear fixed legs, an outer frame and a moving device that are movable relative to the gantry, and a pair of moving units that are provided on the outer frame and that are vertically movable and have a stopper and a gripper at the lower end. Rear fixed legs, an inner frame and a telescopic device capable of expanding and contracting with respect to the outer frame, and a pair of moving front equipped with a mouse and a jet nozzle provided on the inner frame and capable of moving up and down and covering the unexcavated part at the lower end. Partly fixed legs and a pile excavator equipped with a cutter drum on a swingable and slidable arm provided at the front of the fixed legs are provided.

It is preferable that one of the front and rear fixed legs for supporting is configured to be movable with respect to the gantry so that the pitch of both fixed legs can be adjusted to the pitch between the piles.

Further, it is preferable that the outer frame moving device is composed of a rack provided along the outer frame and a motor provided with a pinion which is provided on the rack and meshes with the rack.

Further, a sand pump is built in the cutter drum of the excavator, the excavated earth and sand is connected to a primary solid-liquid separation device on the sea via a mud hose, and the water from which the earth and sand are separated is jetted from a jet nozzle. It is preferable to use

[0011]

In the present invention constructed as described above, the excavator excavates the outer portion of the row of piles, and the pile excavator excavates the periphery of the pile leaving a cylindrical unexcavated portion around the pile. Excavate. Next, the unexcavated portion is covered with a mouse, and the unexcavated portion and the inside of the pile head are excavated with jet water. After that, support the device with both fixed legs for movement, unfasten both fixed legs for support and pull up, move the gantry around the pile around the pile to the excavator side for one pitch of the pile, and then perform the above procedure. Repeat.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, an underwater excavation device embodying the present invention includes a base frame A, an excavator B provided on an upper portion of the base frame A, and a right side of the base frame A (hereinafter referred to as front). A pair of supporting front fixed legs C erected vertically in the front and rear direction, a pair of rear supporting fixed legs D erected rearward, and a front and rear movable in the rear side of the base frame A. An outer frame E provided on the inner frame F, an inner frame F that is elastically supported by the outer frame E and projects toward the front side of the base frame A, and an inner frame F.
Front of the pair of movable front fixed legs G, which is erected at the front end of the outer frame E, a pair of rear movable fixed legs H that are erected at the rear end of the outer frame E, It is roughly configured by a pile excavator J provided in the section.

Referring also to FIG. 6, the base frame A is formed in a substantially rectangular frame shape, and a base plate 1 is stretched at the center in the front-rear direction. An excavator B is provided on the base 1 via a swivel base 2.

On the base portion 10 of the excavator B, one end of a V-shaped bending boom 12 which is undulated by a first cylinder 11 is pivotally attached. At the other end of the bending boom 12, an arm slide guide 14 provided with a slide drive device (not shown) that is undulated by a second cylinder 13 is pivotally mounted. A slide arm 15 is slidably provided on the guide 14, and a cutter drum 17 rotated by a cutter motor 16 is provided at the tip of the arm 15. In addition, on the upper part of the base 10, the underwater manifold 1
8 is provided, and is connected to a marine primary solid-liquid separation device (not shown) through a lifting mud hose 19 supported by a shackle arm 19a via an underwater sand pump (not shown) provided in the cutter drum 17. Then, the excavation radius L outside the pile k is excavated, and when the base frame A is moved, it is stored at the chain line position B1.

Referring to FIGS. 7 and 8, the base frame A
A pair of guide rails 3, 3 are provided on both inner sides in the front-rear direction. The rails 3 and 3 are provided with slide plates 6 and 6 by a pair of vertical rollers 4 and 4 and side rollers 5 that sandwich the rails from above and below. The slide plate 6 above it is moved by a distance M by a slide cylinder 7, and the guide post 20 of the supporting front fixed leg C is attached to this slide plate 6, 6.
Is provided. The guide post 20 has a leg 2
1 is vertically movable and the leg 21 is a guide roller 2
It is adapted to be lifted and lowered by a leg lifting motor 23 provided with a rack 22 provided on the side of the leg 21 guided by the wheels 7 and 27 and a pinion 23a meshing with the rack 22. At the lower end of the leg 21, as shown in FIGS. 10 to 13, a stopper 24 locked to the upper edge of the pile k and an upper gripper 25 that expands and contracts in three directions below the stopper 24.
And a lower gripper 26 are provided.

The supporting rear fixed leg D is provided on each of the guide posts 30 standing upright on the rear portion of the base frame A, and has substantially the same structure as the supporting front fixed leg C.

Referring also to FIG. 3 to FIG. 5, the main body 40 of the outer frame E has two pairs of vertical rollers 41, 41 on the base frame A and two pairs of left and right side rollers 42, 42 on the base frame A.
It is movably supported in the front-back direction. A rack 43 is provided in the front-rear direction on the upper surface of the main body 40, and the outer frame F is moved back and forth by a moving motor 44 having a pinion 44a that meshes with the rack 43. The guide posts 50, 50 provided upright on the rear end of the outer frame E are provided with moving rear fixed legs H having substantially the same structure as the supporting front fixed legs C.

Inside the main body 40 of the outer frame E, the main body 60 of the inner frame F is supported on the front side of the base frame A by a pair of vertical rollers 61, 61, and a pair of side rollers on both sides. 62, 62, a pair of upper and lower vertical guide rollers 63, 63 guided by the outer frame E on the rear portion, and a pair of side guide rollers 64 on both sides.
The inner frame F is retractably accommodated by 64. At the rear part of the main body 40 of the outer frame E, a telescopic cylinder 65 is provided on the axis. A sheave block 66 is provided at the tip of the piston rod 65a, and the sheave block 66 has two sheaves 67a, 67a.
b (67b is not shown) is pivotally supported. The rear end of the main body 40 and the main body 60 are provided on the front side of the one sheave 67a.
An extension wire 68 stretched between the rear end and the rear end is wound. On the rear side of the sheave 67b, a contracting wire 69 stretched between a front end of the main body 40 and a front end of the main body 60 via a slit 60a formed in the main body 60 is wound. Therefore, the inner frame F is expanded / contracted in the range of the extended state of FIG. 3 and the contracted state of FIG. 4 by twice the stroke of the extension / contraction cylinder 65.

On the guide posts 70, 70 provided upright on the front end of the main body 60 of the inner frame F, the movable front fixed leg G is constructed in substantially the same manner as the supporting front fixed leg C.
Is provided. In the vicinity of the portion of the fixed leg G corresponding to the stopper 24, there is provided a pile-surrounding mouse 71 having an inner diameter Q covering the head of the pile k of, for example, 2.4 m. A plurality of jet nozzles 72 for jetting jet water obliquely downward and a pump (not shown) are provided at the lower end portion.

1, FIG. 2, FIG. 9 and FIG. 14, the arm slide of the pile excavator J is mounted on the front surface of the guide posts 70, 70 of the movable front fixed legs G, G via the swivel shaft 81. A guide 80 is rotatably provided by a turning cylinder 82. This guide 80 includes a slide arm 8
4 is movably provided, and is slid by an arm slide device 83. And the arm 8
A cutter drum 86 that is rotated by a cutter motor 85 is provided at the lower end of 4.

Next, the mode of excavation will be described.

In FIG. 14, the outer diameter M (for example, 1.2)
m) piles K1 to K5 ...
Are used in two rows at intervals N (for example, 3 m) and pitch P (for example, 5 m).

First, a diver excavates around four pairs of piles K1 to K4 to remove the earth and sand in the head of the pile K.

Then, the excavation equipment is hung and the piles K3 ...
Inside the K2, the front and rear fixed legs C and D for support are provided as stoppers 2.
4 until it is locked to the head of the pile K, and the upper and lower grippers 25 and 26 are expanded to mount the excavator on the piles K3 to K2.
Fixed to. At this time, the slide cylinder 7 is expanded and contracted to adjust the pitch of the fixed legs C and D to the actual pitch P of the piles K2 to K3.

Next, the slide arm 15 of the excavator B is lifted, swung, and slid, and the piles K1 to K1 are cut by the cutter drum 17.
Level excavation is performed outside K3 with an excavation radius L. The excavated earth and sand is lifted by a sand pump built in the cutter 17 through a blow port (not shown) in the cutter drum 17 to lift the mud hose 1.
The water is sent to the sea primary solid-liquid separation device and the secondary separation tank via 9 and separated into earth and sand and water.
Used for jet water from. At the same time, pile excavator J
As shown in FIG. 15, by swiveling and sliding 84 of No. 84, the range of the outer diameter R (for example, 1.8 m) and the width S (for example, 5 m) around the piles K5 and K5 (shown by the hatched portion). Level excavation is performed to leave the cylindrical unexcavated portions T and T.

Then, as shown in FIG. 16, the fixed leg G is lowered and the unexcavated portion is covered with the mouse 71, and jet water is jetted from the jet nozzle to inject the earth and sand inside the unexcavated portion T and the head of the pile K5. Is excavated and discharged from the discharge port 71a.
Therefore, the fixed leg H is lowered, and both grippers 25 and 26 are opened and fixed to the pile K1.

Next, as shown in FIG. 17, the excavator B is turned, stopped at the position B1 and the center of gravity is moved to the center of the base frame A, and then both grippers 2 of the fixed legs C and D are moved.
5 and 26 are closed and unfixed, and pulled up above the piles K2 and K3.

Then, as shown in FIG. 18, the excavator is supported by the mouse 71 of the movable front fixed leg G and the grippers 25 and 26 of the movable rear fixed leg H, and the slide cylinder 6 is expanded and contracted to be supported. The pitch of the front fixed leg C for use and the rear fixed leg D for support is adjusted to the pitch of the piles K4 and K3. Then, the outer frame moving motor 44 is operated to move the base frame A in the direction of the arrow through the pinion 44a and the rack 43, and the fixed legs C and D are centered above the piles K4 and K3, so that the telescopic cylinder 65 is moved. The inner frame F is extended and the fixing leg, that is, the guide post 70 is positioned above the next pile, and the above procedure is repeated thereafter.

[0030]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it is possible to perform workability between piles with improved workability without damaging and deforming pile heads.

[Brief description of drawings]

FIG. 1 is a side view showing an underwater excavation device embodying the present invention.

FIG. 2 is a top view of FIG.

FIG. 3 is a side sectional view showing an extended state of the outer frame and the inner frame.

FIG. 4 is a side sectional view showing a contracted state of the outer frame and the inner frame.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a sectional view taken along the line BB of FIG.

7 is a cross-sectional view taken along the line CC of FIG.

8 is a cross-sectional view taken along the line DD of FIG.

9 is a sectional view taken along the line ED of FIG.

10 is a sectional view taken along arrow F of FIG.

11 is a sectional view taken along arrow G in FIG.

FIG. 12 is a sectional view taken along line H of FIG.

13 is a cross-sectional view taken along the arrow J of FIG.

FIG. 14 is a perspective view illustrating an excavated state in which an outer side of a pile row and an unexcavated portion are left according to an embodiment of the present invention.

FIG. 15 is a plan view illustrating an unexcavated portion.

FIG. 16 is a perspective view illustrating an excavated state of an unexcavated portion.

FIG. 17 is a perspective view illustrating a state in which the underwater excavation device is supported by both movable fixed legs.

FIG. 18 is a perspective view illustrating a moving state of the base frame.

FIG. 19 is a vertical cross-sectional view for explaining a normal driving state of the box foundation pile.

FIG. 20 is a vertical cross-sectional view illustrating the roughness between piles.

[Explanation of symbols]

 A ... Base frame a ... Pile head B ... Excavator C ... Supporting front fixed leg D ... Supporting rear fixed leg E ... Outer frame F ... Inner frame G・ ・ ・ Movement front fixed leg H ・ ・ ・ Movement rear fixed leg J ・ ・ ・ Pile around excavator K ・ ・ ・ Pile K ・ ・ ・ Foundation pile 1 ・ ・ ・ Base plate 2 ・ ・ ・ Swing base 3 ・..Guide rails 4, 41, 61 ... Vertical rollers 5, 42, 62 ... Side rollers 6 ... Slide plates 7 ... Slide cylinders 10 ... Base 11 ... First cylinders 12 ... ..Bending boom 13 ... Second cylinder 14 ... Arm slide guide 15 ... Slide arm 16,85 ... Cutter motor 17,86 ... Cutter drum 18 ... Underwater manifold 19 ... Lift mud hose 19a ... Le arm 20, 30, 70 ... Guide post 21 ... Leg 22 ... Rack 23 ... Leg lifting motor 23a ... Pinion 24 ... Stopper 25 ... Upper gripper 26 ... Lower part Gripper 27 ... Guide roller 40 ... Main body 43 ... Rack 44 ... Moving motor 44a ... Pinion 60 ... Main body 63 ... Vertical guide roller 64 ... Side guide roller 65. ..Expansion / contraction cylinder 66 ... sheave block 67a, 67b ... sheave 68 ... extension wire 69 ... contraction wire 71 ... pile excavation mouse 71a ... exhaust port 72 ... -Jet nozzle 73 ... Revolving cylinder 80 ... Arm slide guide 81 ... Revolving shaft 82 ... Revolving cylinder 83 ... Arm slide device 84: Slide arm

Claims (2)

(57) [Claims] 1. After excavating the inside and outside of the heads of four pairs of piles out of two rows of piles driven by diving work, two pairs of supporting fixed legs provided on the pedestal of the excavator are lowered to 4 It is fixed to two pairs of inner piles, and the outer portion of the row of piles is level-excavated by an excavator provided on the pedestal, and at the same time, the outer frame movable to the pedestal is expanded and contracted. Level excavation around a pile near the excavator by a pile excavator provided on a pair of movable front fixed legs at the ends to leave a cylindrical unexcavated portion around the pile, and the unexcavated portion And, the inside of the pile head is covered with a mouse provided on the moving front fixed leg to be excavated with jet water, and a pair of moving fixed legs provided at the end of the outer frame are lowered and fixed to the remaining piles, Support the excavator together with the other movable fixed leg, and unfasten and pull down both supporting fixed legs. After that, the gantry is moved to the excavator side around the pile with respect to the outer frame, and the both fixed legs for supporting are positioned above the pile with a pitch of one pitch. Underwater excavation method characterized by level excavation. 2. A gantry, an excavator provided on the gantry and having a cutter drum on an arm capable of undulating, sliding and rotating, and one pair each provided on the gantry and provided with a stopper and a gripper at a lower end thereof. Supporting front and rear fixed legs, an outer frame and a moving device that are movable relative to the frame, and a pair of moving front rear parts provided on the outer frame and capable of moving up and down and a stopper and a gripper at the lower end. A fixed leg, an inner frame and an expansion / contraction device that can expand and contract with respect to the outer frame, and a pair of movable fixed legs that are provided on the inner frame and that are vertically movable and that have a mouse and a jet nozzle at the lower end to cover the unexcavated portion. An underwater excavation device, comprising: a pile rotation excavator provided with a cutter drum on a swingable and slidable arm provided at a front portion of the fixed leg.