JP2515888B2 - Construction method of steel pipe pile for building offshore structure and its equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a construction method of a steel pipe pile for constructing a marine structure such as a jetty and its apparatus.

[Prior Art] When constructing an offshore structure such as a jetty, steel pipe piles are constructed in a rock layer on the seabed.

After the construction of this steel pipe pile, the conventional construction method and its equipment could not be continuously constructed, and the construction efficiency was low.

[Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a construction method and a device therefor which are continuously high in construction efficiency.

[Means for Solving Problems] According to the present invention, a rubble layer is constructed on a bedrock layer on the seabed where an offshore structure is built, and a part of the rubble at a predetermined position of the rubble layer is removed, and a work boat Mooring at a predetermined position, lowering the leg, building a casing pipe from the work boat to bite into a portion of the rubble layer of the rubble layer, and turning the casing pipe to excavate the casing while casing. After lowering the pipe until the tip reaches the bedrock layer, the bedrock layer under the casing pipe is excavated to a predetermined depth, a steel pipe pile is installed in the excavated hole through the casing pipe, and mortar is specified in the steel pipe pile. A construction work for a steel pipe pile for constructing a marine structure characterized by inserting gravel between the steel pipe pile and the casing pipe and then pulling out the casing pipe after casting to a height to cure the mortar. The law is provided.

Further, according to the present invention, a work boat, a building device for building a casing pipe and a steel pipe pile from the work boat, a swivel device movably provided on the work boat for swiveling and raising the casing pipe, and A steel pipe for constructing an offshore structure, comprising: a surface excavator for excavating a surface layer of a rock layer under the casing, and an excavator for freely excavating a rock layer under the casing pipe. Pile construction equipment is provided.

[Advantageous effects of the invention] Therefore, when the excavation by the surface layer excavator is completed, the excavation is moved, the swivel device is moved to the place where the next steel pipe pile is to be constructed, and the next casing pipe is installed by the installation device. Construction can be performed continuously, and construction efficiency can be improved.

[Preferable Embodiments] When carrying out the present invention, it is preferable that a guide member for positioning and guiding the casing pipe is detachably provided on the side wall of the work boat. In carrying out the present invention, it is preferable to detachably install a steady rest below the guide member for holding the steel pipe pile which has been constructed on the work boat until the work boat is removed.

Regarding the implementation of the present invention, the excavator is composed of a main body and a rotary gantry, and the main body is loaded on a material carrier moored next to the work boat,
It is preferable to place the rotary platform on land and move both to the work boat when necessary.

In practicing the present invention, steel pipe piles are preferably loaded on a pile barge moored next to the workboat.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show an apparatus for carrying out the present invention. The apparatus is movably provided on a work boat, ie, CEP 1, a crawler crane 12 which is an installation device on CEP 1, and CEP. Full-swivel casing excavator 20 which is a swivel device, club hammer (Fig. 17) 44 which is a movable surface layer excavator, and rotary excavator which is a movable excavator.
It is roughly composed of 30 and.

In FIGS. 1 to 3, a sep 1 is a known technique, and a leg 4 which is vertically movable is provided at four corners of a rectangular deck 2, and rails 5 and 5 are provided along one side in the longitudinal direction.
And a plurality of brackets 6 for horizontally mounting the lower conductive material 7 which is a guide member for the casing pipe C described later are horizontally provided on the side wall on the side. In the figure, reference numeral 3 is a work area of the crawler crane 12, 13 is a compressor, and 14 is a generator.

1 to 4, a full swing casing excavator 20 is movable on a rail 5 or 5 by a traveling hydraulic unit 21 by a traveling carriage 22 and on a movable 22 on a rail 5 in a direction orthogonal to the rail 5. Outriggers on both front and rear
It comprises a crawler carriage 25 provided with 23, 24, a swivel head 26 provided in the front part of the crawler carriage 25 for rotating and raising and lowering the casing pipe C, and a swivel unit 27 for swiveling the swivel head 26. Reference numeral 28 in the figure is a work scaffold.

1, FIG. 2, FIG. 5, and FIG. 6, the rotary excavator 30 is of a known technique, and a casing head (not shown) attached to the casing pipe C is provided with a rotating device, and It is attached via a rotary mount 31 forming a part, and is adapted to rotate a known drill string (FIG. 1) 32 for excavation. In the figure, reference numeral 33 is a power unit for excavation, 34 is a water supply pipe, and 35 is a soil discharge pipe.

In FIGS. 7 to 10, a lower conductive member 7 for positioning and guiding the casing pipe C is stretched on the bracket 6. Guide rollers 9 are provided on the lower conductive member 7 at equal intervals on the circumference 4 for adjusting the amount of movement by a stroke adjusting handle 8 and positioning and guiding the casing pipe C.

Further, as shown in FIGS. 11 and 12, a beam 10 is horizontally attached below the bracket 6 on the side wall of the deck 2,
The beam 10 is provided with a steady rest bracket 11 which is a steady rest member for steadying the steel pipe pile P after the construction until the sep 1 moves.

As shown in FIG. 2, the rotary excavator 30 is moved onto the sep 1 as shown in FIG. 2, and the casing head attached to the casing pipe C is mounted on the casing head. It is mounted via the rotary mount 31, but when not in operation, it is stored together with the drill links 32 on the material carrier 15 moored next to the SEP 1, and the rotary mount 31 is stored on land. In the figure, reference numerals 16 and 16 are muddy water tanks provided on the material carrier 15, and 17 is 18 is a mud screen, 19 is a pile of steel pipes P, 1 sep
It is a pile barge moored next to.

Next, an embodiment of the construction method will be described with reference to FIGS. 13 to 27.

1st order (Fig. 13): A rubble layer B is constructed by a publicly known arbitrary method on the bedrock layer A on the seabed where the offshore structure is built in advance, and the anchor 40 is placed on the land portion of the adjacent quay W. I'll do it. Then, the sep 1 is positioned by landing by a tugboat 39, and is anchored to the anchor 40 by the wire 41, and the quay W
An embarkation pier (Fig. 1) 42 will be stretched between and. At this time, it is preferable to attach the protective member 41 to the portion of the quay W that contacts the wire 41. Then, the legs 4 to 4 are lowered.

2nd route (Fig. 14): Preloading the set 1
It is confirmed by measurement that SEP 1 is stably retained on the rubble layer B. Next, the securing of the mounted equipment such as the crawler crane 12 to the SEPP 1 is released, and the lower conductive material 7 placed on the brackets 6 to 6 on the land by the crawler crane 12 is released.
Install.

On the other hand, a part of the rubble B1 of the rubble layer B on which the steel pipe pile P is to be constructed is removed by the diver S, and the material excavator 15 having the rotary excavator 30, the casing pipe C, and the like adjacent to the CEP 1 is loaded. Mooring.

3rd route (Fig. 15): Move the full swing casing excavator 20 to the position where the steel pipe pile P should be installed, and move the crawler crane 12
The casing pipe C on the material carrier 15 is installed by the swivel head (Fig. 3) 26 of the excavator 20 by adjusting the movement amount of the guide roller (Fig. 10) 9 of the lower conductive material 7 and positioned. And adjust the casing pipe construction.

Fourth route (Fig. 16): Next, confirm the biting of the casing pipe C to the rubble layer B, attach a casing head (not shown) to the casing pipe C, and turn the turning head 26 of the excavator 20. Then, excavation is performed with a cutting edge (not shown) formed at the lower end of the casing pipe C.

5th route (Figs. 17 and 18): When the tip of the casing pipe C reaches the bedrock layer A, the club hammer 12 is adjusted to the Clara crane 12 to remove the rubble in the casing pipe C, Excavate the surface of bedrock layer A. At this time, if the club hammer 44 cannot excavate, the quay is crushed by a chisel (Fig. 18). Then, after confirming that the excavation length is a predetermined amount, the casing head (not shown) is removed.

6th route (Fig. 19): Next, the full swing casing excavator 20 is moved to the place where the next steel pipe pile P should be constructed, and the next steel pipe pile P is begun to be constructed from the 3rd route. On the other hand, the casing head is reattached to the casing pipe C, and the rotary base 31 is lifted from the land by the crawler crane 12 and set on the casing head.

7th route (Fig. 20): Then, the crawler crane 12 is used to set the rotary excavator 30 from the material carrier 15 on the rotary platform 31, and the drill strings 32 are built in the casing pipe C in the same manner. In addition, the water supply pipe 34 is connected to the submersible pump (Fig. 1) 46 of the material carrier 15, and the soil discharge pipe 35 is connected.
Connected to the mud screen 18 of the material carrier 15 and air piping
Connect 47 to onshore compressor 48.

8th route (Fig. 21): Next, the drill strings 32 are rotated by the rotary mount 31 to excavate the bedrock layer A to a predetermined depth, and the compressor 48, the air pipe 47, the submersible pump 46, the water supply pipe 34, and the drainage pipe are discharged. Earth pipe 35, mud screen 18, The drilling slime is processed by the mud tank 16 or the like. And after checking the drilling length, drill strings
32 removed, rotary excavator 30 removed, and material carrier
15 Temporarily place on top. Next, drilling of rock layer A (Fig. 23)
Measure the hole wall of D and remove the rotary mount 31.

Route 9 (Figs. 22 and 23): Next, Sep 1
Pile barge 19 having steel pipe piles P adjacent thereto is laid up, and steel pipe piles P are erected in casing pipe C and drilled hole D by crawler crane 12 via suspension metal fittings 49 and sling wires 50. At this time, a spacer 50 is provided between the drilled hole D and the steel pipe pile P to form a required gap, and a slit 52 is provided at the lower end of the steel pipe pile P so as to bite the bottom surface of the drilled hole D. Preferably.

Route 10 (Figs. 24 and 25): Next, connect the mortar hose 54 to the mortar pump 53 installed on land,
After the water in the water tank 55 is sent to stir the slime, it is placed in the machining D through the mortar agitator 57, the mortar pump 53 and the mortar hose 54 of the track mixer 56.
At this time, the interface gauges are installed inside and outside the steel pipe pile P at a predetermined height within the drilled hole D.
Set 58 and 58 and check the casting height of the mortar M from the mortar injection pipe 59.

11th work order (Figs. 26 and 27): Next, after curing the mortar M that has been placed, the opening of the steel pipe pile P is covered with the chute 60 for throwing gravel, and the crawler crane 12 is loaded with the gravel throwing bucket 61. The gravel B2 of the hanging and bucket 61 is charged into the gap E between the casing pipe C and the steel pipe pile P.

12th route (Figs. 28 and 29): Next, the full swing casing excavator 20 is moved and checked by the swing head 26, and the casing pipe C is pulled out while swinging. As a result, the lower end of the steel pipe pile P is fixed in the drilled hole D, the part of the rubble tank B is surrounded by the rubble B1 via the gravel B2 and stabilized, and the steel pipe pile P can be reliably erected on the rock layer A. it can. Finally,
The lower conductor 7 is removed, and as shown in FIG. 11, the steady rest bracket 11 is attached to the beam 10 to hold the steel pipe pile P.

Thus, as shown in FIG. 2, for example, position I,
Steel pipe pile P was constructed in the order of II, III and IV, and Sep 1
After removing, the offshore structure (not shown) is built on the steel pipe pile P.

[Summary] As described above, according to the present invention, the full-swivel casing excavator and the rotary excavator are moved according to the work order, the work steps are performed in parallel, and steel pipe piles are continuously constructed, As a result, the construction efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing the vicinity of a sep, FIG. 2 is a side view of the sep, FIG. 3 is a side view showing a full swing casing excavator,
4 is a top view of FIG. 3, FIG. 5 is a side view showing a rotary excavator, FIG. 6 is a top view of FIG. 5, FIG. 7 is a side view showing a lower conductor, and FIG. 7 is a top view of FIG. 7, FIG. 9 is an enlarged view of an essential part of FIG. 8, FIG. 10 is a sectional view showing around the guide roller, FIG. 11 is a side view showing a steady rest bracket, and FIG.
The figures are the top view of FIG. 11, FIG. 13, FIG. 14, FIG. 15, and FIG.
Figure 17, Figure 17 and Figure 18, Figure 19, Figure 20, Figure 21, Figure
FIG. 22 and FIG. 23, FIG. 24 and FIG. 25, FIG. 26 and FIG. 27, FIG. 28 and FIG. 29 are respectively the first, second, third, fourth, fifth and sixth, respectively. 7th, 8th, 9th, 10th, 11th
FIG. 16 is a side view for explaining a twelfth work order. 1 …… Work boat, 12 …… Crawler crane, 20 …… Full swing casing excavator, 22 …… Mobile cart, 30 …… Rotary excavator, 44 …… Club hammer, C …… Casing pipe

Claims (2)

(57) [Claims] 1. A rubble layer is constructed on a bedrock layer on the seabed where an offshore structure is built, a part of the rubble stone at a predetermined position of the rubble layer is removed, and a work boat is moored at a predetermined position to lower a leg. , A casing pipe was built from the work boat to bite into a portion of the rubble layer of the rubble layer, and the casing pipe was swiveled to lower the casing pipe until the tip reached the bedrock layer while excavating the inside of the casing. After that, the rock layer under the casing pipe was excavated to a predetermined depth, a steel pipe pile was installed in the excavated hole through the casing pipe, and the mortar was cured by driving mortar to the steel pipe pile to a predetermined height. After that, a method for constructing a steel pipe pile for constructing an offshore structure, characterized by pouring pebbles between the steel pipe pile and the casing pipe and pulling out the casing pipe. 2. A work boat, an erection device for constructing a casing pipe and a steel pipe pile from the work boat, a slewing device movably provided on the work boat for slewing and lifting the casing pipe, and A surface layer excavator for excavating the surface layer of the rock layer under the casing, and an excavator for movably excavating the rock layer under the casing pipe, of a steel pipe pile for constructing an offshore structure. Construction equipment.