JPH07107349B2 - Spar Buoy-type boring tower sinker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sinker used when mooring a spar buoy type boring turret, which is a scaffold for submarine excavation, which is submerged in the sea floor and used for geological investigation or boring work on the sea floor. It is a thing.

[0002]

2. Description of the Related Art In carrying out a geological survey or boring work on the seabed, as shown in FIGS. 4 and 15, one end of a pillar body B provided with a buoyant body A is fixed by a mooring device C. It is possible to use a spar buoy type boring turret moored to the sinker, pulling the buoyancy body A into the water, and letting the water line L come in the middle of the standard pillar body B above it, so that it stands upright in the water by buoyancy. It has been proposed (1991 Patent Application No. 49157). The idea of using the retractable mooring type spar buoy in carrying out the above-mentioned work is that it was noted that there is little inclination due to wave wind, it is stable in an upright state, and it is relatively easy to move.

The above described superbuoy type boring turret will be described in more detail. A center pipe D is provided so as to pass through the buoyant body A and the pillar body B, and the lower end of the center pipe D reaches the bottom plate of the pillar body B and is opened in water. Also,
The upper end of the center pipe D should be positioned at least above the water line L, and a casing pipe for boring, a rod, a sampler, or the like, as shown by the reference numeral E, in the pipe (for the purpose of this specification, these pipes for boring should be used. Will be abbreviated). And, the pillar B and the center pipe D have a double pipe structure,
The outside of the center pipe D is watertight and hollow so that the buoyancy of the spar buoy is increased, and water penetrates into the center pipe D up to the water line. On the other hand, a work platform F is provided on the top of the pillar body B.

[0004]

By the way, the boring pipes E which are inserted through the center pipe D vertically pass through the sinkers for mooring the spar buoy type boring turret and are the ground which is the seabed. Reaches G and extends further into the ground.

Therefore, although one sinker sunk on the seabed is naturally formed with a hole through which the boring pipes E pass vertically, the hole is large enough for the boring pipes E to pass through. Only the bottom of the sinking weight is in contact with the foundation ground, so the weight of the sinking weight will be added to the substrate around the boring hole, the ground will be deformed, and it will be different from the natural state. However, there was a drawback that it was not possible to grasp the accurate soil structure and soil characteristics by all in-situ tests, or to sample undisturbed samples to obtain soil constants in the natural state.

The present invention aims to overcome these drawbacks.

[0007]

In order to achieve this object, according to the present invention, a working platform is provided on the top of the pillar body B.
A buoyancy body A in the middle of the pillar body B,
The lower end of B is moored to the sinker by the mooring device C so that it can be tilted freely.
The buoyant body A is drawn into the water, and the pillar above the buoyant body A
Super buoy type with a water line in the middle of body B
In the sinking turret, the sinker is surrounded by a plurality of sinkers.
Place the edge, vertically bowling pipes such E in the central portion
A sinker box 6 provided with a portion 1 penetrating the
Placed at a predetermined distance below the peripheral edge of the container box 6
And supports the weight of the sinker box 6 on the seabed.
And a relatively large space 2 at the bottom near the center of the sinking weight .

[0008] and the bearing capacity portion 3, the reinforcement was allowed positioned above the inner side of said supporting pressure section 3 a between the sinker box 6 arranged above the strip plate at a predetermined interval, It is preferable to arrange it so that it is perpendicular to the ground G.

In order to achieve the above object, the present invention
On the top of the pillar body B, the work platform F,
A buoyant body A is provided in the middle of the body B, and the lower end of the pillar body B is engaged.
The buoyant body A is moored to the sinker by a retaining device C so as to be tiltable.
Of the buoyancy body A above the buoyancy body A
The sinker of a spar buoy type boring turret with a water line.
In the above, the sinker is composed of two upper and lower frame bodies 21 and 22 intersecting each other in a cross shape in a plane, and both of the frame bodies 21 and 22 outside the portion 1 through which the boring pipes E pass vertically. A pair of leg pieces 23, 23, 24, 24 are provided on the bottom, respectively, and the inside of each of the leg pieces 23, 23, 24, 24 and the lower vicinity of the intersection of the two upper and lower frame bodies 21, 22 are relatively. It is a large space 2 .

Two upper and lower frame bodies 2 intersecting each other in a plane cross shape
It is convenient to keep 1 and 22 separable.

Further , it is preferable to provide a bearing portion 3'for supporting the weight of the sinking weight on the bottom of the leg pieces 23, 23, 24, 24.

It should be noted that a cone 9 for guiding the boring pipes may be arranged in the portion 1 through which the boring pipes E pass vertically.

[0013]

As shown in FIGS. 4 and 15, the sinker according to the present invention is also sunk on the bottom of the sea during geological survey of the seabed or boring work. The lower end of B is moored. Then, as shown in FIGS. 5 and 16, the boring pipes E inserted through the center pipe D penetrate the sinker vertically to reach the ground G, which is the seabed, and further extend into the ground. .

In these cases, a plurality of peripheral parts are provided.
The sinker box 6 in which the sinkers are arranged and its circumference
A predetermined space is provided between the bearing portion 3 disposed below the edge.
Exists, and the bottom near the center of the sinking body, which corresponds to the periphery of the boring pipes E that vertically pass through the sinking body,
Because they become relatively big space 2, when boring work and sampling without acting on the boring point foundation ground, it is possible to perform boring under natural conditions, properly grasp and sampling of soil structure < You can do it.

By the way, a predetermined space is provided between the bearing portion 3 and
The reinforcing material was allowed positioned above the inner side of said supporting pressure section 3 a between the sinker box 6 arranged above the strip-shaped plate Te, it when placed so as to be perpendicular to the ground G, Even if the sinker installed on the ground is soft and sinks from the ground G as shown in FIG. 5, the bottom of the sinker box 6 containing the sinker, which is a heavy object, The pressure does not directly act on the ground G, and the earth pressure can be prevented as much as possible from being exerted on the sinking sinker.

[0016] On the other hand, constituted by two upper and lower frame bodies 21 and 22 crossed the sinker in flat cross shape, boring for pipes
Both frame bodies 21, 2 which are outside the portion 1 where E penetrates vertically
A pair of leg pieces 23, 23, 24, 24 on the bottom of 2
Provided inside the leg pieces 23, 23, 24, 24
Compare the lower part of the intersection of the two upper and lower frames 21, 22
If the space 2 is large, the sinking weight should be on the ground G.
When installed, the top and bottom are crossed in a flat cross shape.
The two frame bodies 21, 22 are the leg pieces 23, 23, 24, 2
Since it will be separated from the ground G by a length of 4, 2 above and below
The area near the bottom of the intersection of the two frames 21 and 22 is relatively large.
It is a space 2 where you can perform bowling work and sump
During the ring, it may affect the foundation ground at the boring point.
It is possible to do boring under natural conditions
Therefore, it is possible to properly grasp the soil structure and properly perform sampling.
Wear. If the sinker body is composed of the upper and lower two frame bodies 21 and 22 that intersect in a plane cross shape, the weight of the sinker body can be reduced. Also, as shown in FIG.
Even if the ground G ′ on the seabed is tilted by θ with respect to the horizontal ground G and a sinker is installed on it, if the ground G ′ falls within the range of θ with respect to the perpendicular H ′ of the tilted ground G ′. It is possible to descend the boring pipes E without hitting a part of the weight. In other words, if the sinking body is not of a type in which the upper and lower frames are intersected in a plane cross shape, even if the ground G ′ is slightly tilted, the pipes for boring have been vertically lowered. It was common for E to hit a part of the sinker, but in the case of this type,
Even if the ground G ′ is slightly inclined, the boring pipes E can be lowered, and the installation location of the sinking weight is not greatly limited.

If the upper and lower two frame bodies 21, 22 are made separable, the sinker can be separated into two frame bodies and made smaller.

Further, a pair of leg pieces 23, 23, 24, on the bottoms of the upper and lower two frame bodies 21, 22 which intersect in a plane cross shape.
In the case where each of the leg pieces 23, 23, 24, 24 is provided with a bearing portion 3'for supporting the weight of the sinker ,
It can support the weight of the sinker in considerable distance from the borehole to be drilled by the boring for pipes E. In addition, it is possible to hold a more natural situation,
It is possible to obtain high-quality soil survey results, and also to obtain the accuracy of various in-situ test results using boring holes, which are performed to grasp the strength characteristics of the ground, and to obtain accurate soil mechanics. It enables sampling of undisturbed soil, which is essential for obtaining constants.

Furthermore, the cone 9 for bowling pipes guiding the portion 1 bowling pipes E penetrates up and down is arranged, long coming is descending through the center pipe D of the marker mast B When the boring pipes E are vertically penetrated, the long boring pipes E can be reliably guided by the cone 9.

[0020]

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

FIG. 1 is a plan view of the entire sinker showing a first embodiment of the present invention, and FIG. 10 is a plan view of the entire sinker showing a second embodiment of the present invention. Although the sinker shown in the first embodiment has a rectangular shape when viewed in plan, the overall shape is not limited to the case of the illustrated example, and may be, for example, circular or polygonal in plan view. Good. On the other hand, the sinker shown in the second embodiment has a plane cross shape.

The sinking weight shown in the first embodiment is as shown in FIG. 4, and the sinking weight shown in the second embodiment is as shown in FIG. 15, both of which are used for geological survey of the seabed or boring work. The mooring device C is sunk to the bottom of the sea when performing, as in the conventional case.
Thus, the lower end of the pillar body B is anchored to each sinker.
Then, as shown in FIGS. 5 and 16, the boring pipes E inserted through the center pipe D vertically penetrate through the sinkers to reach the ground G which is the seabed, and further to the ground. It can be excavated by stretching and rotating it.

First, a first embodiment of the present invention will be described with reference to FIGS.
It will be described in detail based on.

In the sinker shown in the first embodiment, a plurality of
The sinkers 8 are arranged in the peripheral portion and are bored in the central portion.
Sinker provided with a portion 1 through which the pipes E for use penetrate vertically
Predetermined below the box 6 and the periphery of the sinker box 6.
The weight of the sinker box 6 arranged at intervals of
The sinker is composed of the bearing part 3 that supports the
In order for the boring pipes E to pass through the sinker vertically, the center of the sinker body is notched in a square shape from top to bottom . And a plurality of sinkers around the periphery
Sinker box 6 in which 8 is arranged and below the periphery thereof
There is a predetermined interval between the bearing capacity portion 3 that are located in the
Therefore, for boring that vertically penetrates the sinker body
A relatively large space 2 is formed at the bottom near the center of the sinker body corresponding to the periphery of the pipes E. This space 2
The, at least as long as the size by Redirecting a listening space required to bowling for pipes E penetrates the sinker up and down. The space 2 may be formed only at the bottom near the center of the sinker body, but in the case of the first embodiment, the center of the sinker body is cut into a square shape from top to bottom to form a boring. A rectangular space 2 having substantially the same size as that of the portion 1 through which the pipes E penetrate is formed.

At the bottom of the sinking weight outside the space 2, a bearing portion 3 for supporting the weight of the sinking weight is formed in an annular shape. In the embodiment, since the sinker main body has a rectangular shape when seen in a plan view, the pressure bearing portion 3 also has a rectangular frame shape as shown in FIG. 6, but the shape is not limited to this case. The shape is not limited to a circular shape or a polygonal shape. Further, the bearing portion 3 in the first embodiment is a rectangular annular bottom plate 3
It is constructed by welding I-shaped steel 3b on a in a double frame shape and placing concrete 3c in the frame. However, instead of the concrete 3c, divided cast iron blocks may be juxtaposed in the frame. When the bearing portion 3 is annularly provided at the bottom of the sinking weight, the weight of the sinking weight can be supported at a position considerably distant from the boring hole drilled by the boring pipes E, and a more natural static Soil data can be obtained or samples can be taken under soil pressure conditions.

In the first embodiment, FIG.
In FIG. 6, two H-section steels indicated by 4a and two strip-shaped plates indicated by 4b located between them are crossed over in the left-right direction of the bearing section 3 in FIG. Is welded to. The two strip-shaped plates 4b and 4b are arranged so as to lean vertically. Further, from the two H-shaped steels 4a and 4a, strip-shaped plates 4c, which are bridged over the frame portion appearing on the bearing portion 3 in FIG. The bearing portion 3 is welded to the upper surface of the I-shaped steel 3b. All of these members are reinforcing members, and on the reinforcing member 4 composed of these members, a rectangular frame body made of H-shaped steel and 5 left and right strip-shaped plates 5b shown in FIG. The reinforcing member 5 including 5b is welded. The two strip-shaped plates 5b and 5b are also arranged in a state of leaning vertically like the strip-shaped plate shown by 4b in FIG.

A sinker box indicated by 6 in FIG. 9 is arranged on the upper reinforcing member 5, and both are fixed by a large number of bolts 7. In addition, when the bolt 7 is removed, the sinker box 6 and the lower part can be separated.

By the way, in the portion 1 through which the boring pipes E pass vertically and the space 2 located immediately below the portion 1, the bottom plate of the central portion of the sinker box 6 arranged on the upper reinforcing member 5 is removed in a square shape. Is formed by
The surrounding area is defined as a partitioned room 6a, in which a sinker 8 which is a heavy object as shown by a chain line in FIG. 2 and a solid line in FIG.
Store one by one. In the first embodiment, each chamber 6a
The plate which is the partition wall is made lower as it goes outward as indicated by 6'in FIGS. This is devised so that the sinker 8, which is a heavy item, can be easily stored in each chamber 6a.

The two strip-shaped plates 4b which are a part of the reinforcing plate 4 and the two strip-shaped plates 5b which are a part of the reinforcing plate 5 which are located directly below the sinker box 6 are flat. 2 and 5b 'are welded and fixed to each other, and as shown in FIGS. 2 and 3, the space 2 below the portion 1 through which the boring pipes E pass vertically. Will not block. Also, two strips 4
b, 4b and the two strips 5b, 5b are both arranged vertically leaning against each other, so when the sinker is sunk on the seabed, the two strips 4b, 4b and 5b, 5b are Also becomes a right angle with respect to the ground G, and even if the sinker installed on the ground is soft and sinks below the ground G as shown in FIG. The pressure of the bottom surface of the sinker box 6 in which does not exist does not directly act on the ground G, and it is possible to prevent earth pressure from being applied to the sinking sinker as much as possible. The range in which the pressure on the bottom surface of the sinker box 6 does not directly act on the ground G even when the sinker sinks from the ground G is between the bottom surface of the bearing portion 3 and the bottom surface of the sinker box 6, that is, G _L in FIG. It is within the range of the height H from G _H to G _H , and even if the sinker sinks from the ground G within this range, the pressure on the bottom surface of the sinker box 6 does not directly act on the ground G.

Next, a second embodiment of the present invention will be described in detail with reference to FIGS.

In the sinker according to the second embodiment, the upper and lower two frame bodies 21 and 2 whose main bodies intersect each other in a plane cross shape are provided.
2, and the overall shape is a plane cross.
With such a structure, it is possible to form a portion 1 through which the boring pipes E penetrate in the frame at the intersection of the two frame bodies 21 and 22. Then, on the bottoms of both the frame bodies 21 and 22 which are outside the portion 1 through which the boring pipes E penetrate, the leg pieces 2 are paired in a pair in the longitudinal direction of the frame body.
3,23,24,24 are attached. In the case of such a structure, as shown in FIG. 12 and FIG. The space 2 can be relatively large. The space 2 may be I become Redirecting a listening by a size for both the bowling pipes E less penetrating sinker up and down.

The sinker having such a structure is installed on the ground G.
When crossed, the top and bottom are crossed in a cross shape.
The frame bodies 21 and 22 are the lengths of the leg pieces 23, 23, 24, 24
Since it will be far away from the ground G, there are two upper and lower frames
A relatively large sky near the intersection of the bodies 21 and 22.
The interval is 2 and boring work and sampling
At this time, do not affect the foundation ground at the boring point.
The soil can be drilled under natural conditions.
The structure can be grasped and sampling can be properly performed.
In this case, the weight of the sinker body can be reduced in weight. Further, as shown in FIG. 17, even when the ground G ′ on the seabed is inclined by θ with respect to the horizontal ground G and the sinker is installed on the ground G ′, the vertical line H ′ of the ground G ′ is inclined. If it is within the range of θ, the boring pipes E can be lowered without hitting a part of the sinker. In other words, if the sinking body is not of a type in which the upper and lower frames are intersected in a plane cross shape, even if the ground G ′ is slightly tilted, the pipes for boring have been vertically lowered. E is was often hit the part of the sinker, but if were of this type, be ground G 'is somewhat inclined <br/> even go made a bowling pipes E It is possible, and the place where the sinker is installed is not greatly limited.

The upper and lower two frame bodies 21 and 22 may be fixed to each other by welding, but it is preferable that the two frame bodies 21 and 22 are separable as shown in FIGS. 13 and 14. That is, the upper and lower two frame bodies 21 and 22 can be fixed by a large number of bolts 25, and conversely, the bolts 25 can be fixed.
When removed, the upper and lower two frame bodies 21 and 22 can be separated. Therefore, in the embodiment, two upper and lower frame bodies 21 and 2 are used.
A flange 26 (FIG. 13) is attached to the lower surface of the upper frame body 21 and a flange 27 (FIG. 14) is attached to the upper surface of the lower frame body 22 at four joints where 2 intersects. . The upper and lower two frame bodies 21 and 22 can be fixed by a large number of bolts 25 with the two flanges 26 and 27 located above and below joined together.

In this way, when the upper and lower two frame bodies 21 and 22 are separable from each other, the sinker is formed into two rectangular frame bodies 2.
1 and 22 can be separated and made smaller. This makes it possible to reduce the maximum size frame portion of the sinker component by separating it into two. Therefore, transportation by truck or the like becomes possible.

Two upper and lower frame bodies 2 intersecting in a plane cross shape
A portion of the upper surface of the first and the second portions 22 excluding the frame body, which is the intersecting portion of the two, that is, the portion protruding outward in FIG. Two frames 21
The upper and lower frame members 21 are
The sinker installation portion 28 in FIG. 11 and the sinker installation portion 29 in the lower frame 22 are different in level, so that the sinker 8 ′ is also higher in height on the frame body 21 side and the frame body 22 side as shown in FIG. Will be installed in different places.
10 and 11, reference numeral 30 is a corner plate for the sinker 8 ', and the sinker 8'is housed inside thereof.

At the bottom of the pair of leg pieces 23, 23, 24, 24, a bearing portion 3'for supporting the weight of the sinking weight is provided. The bearing portion 3'in the second embodiment is a flat plate arranged horizontally, and the weight of the sinking weight can be supported by a bearing plate composed of four flat plates. When the bearing portion 3'is provided at the bottom of the pair of leg pieces 23, 23, 24, 24 in this manner, the weight of the sinker is located at a position considerably distant from the boring hole formed by the boring pipes E. To obtain soil data or take samples under more natural static soil pressure conditions.

In the pressure bearing portions 3 shown in FIGS. 11, 12, 16 and 17, a large number of expanded metals 31 are fixed to the lower surface of the pressure bearing plate by welding, and a large number of weights are provided when the sinker is installed. The expanded metal 31 of No. 3 is allowed to penetrate into the ground G. This increases the frictional resistance of the sinker against the ground G when the sinker is installed, and can prevent the sinker from sliding.

18 and 19 show a modification of the sinker shown in the second embodiment. This sinking point is largely different from that of the second embodiment in that the expanded metal 31 described above is used.
Instead, the spike pipe 32 is used. That is, as shown in FIG. 19, a spike pipe 32 is fixed to the lower surface of the pressure bearing plate by welding so that the spike pipe 32 can bite into the ground G when the sinker is installed. As a result, the same effect as when a large number of expanded metals 31 are fixed to the lower surface of the bearing plate can be expected.

The upper and lower frame bodies 21 and 22 and the leg pieces 23 and 24 can be made of H-shaped steel.

On the other hand, in the portion 1 through which the boring pipes E pass vertically, a cone 9 for guiding the boring pipes is provided.
If you leave place, in the case of the first embodiment, FIG. 3, the drop-off long bowling pipes E inserted through the center pipe D from the work platform F as shown in FIG. 5 <br / > When coming, the cone 9 can guide the tip of the boring pipes E to be surely inserted into the sinking weight. By the way, the total length of the boring pipes E is longer than the water depth when the sinker is submerged (for example, when the sinker is submerged at a depth of about 30 m, about 40 m of boring pipes is required). ), It is extremely troublesome to insert the long boring pipes E into the sink sunk on the sea floor from a high place on the water surface, but the cone 9 is arranged in the portion 1 where the boring pipes E penetrate vertically. When being, it can be inserted reliably long bowling pipes to sinker submerged et a on the ocean floor from any work platform F located on the water surface.

10 to 19 showing the second embodiment, the state in which the cone 9 is arranged is not shown at all, or is stopped to the extent shown schematically, but it is shown in the second embodiment. When arranging this cone 9 on the sinker, refer to FIG.
As shown in FIG. 2, a pair of left and right mounting members 33, 33 made of H-shaped steel are bridged on the upper frame 21 at the central portion of the upper frame 21, that is, the portion intersecting the lower frame 22. The cone 9 is attached so as to be bridged between the attachment members 33, 33. When the cone 9 is arranged in this portion, the same effect as in the first embodiment can be expected.

The sinker shown in the first embodiment is the bolt 7
Since the sinker box 6 and the lower part can be separated and assembled by using the sinker box 6, the sinker box 6 and the sinker box 6 can be assembled by using buoyancy at a shallow water depth (for example, in a port).
Can be inserted at a deep installation site. Further, eight guide plates 10 having a substantially L shape are attached to the outer peripheral portion of the reinforcing member indicated by 5 in FIG. 8 so that the sinker box 8 can be easily set.

In the drawings (FIGS. 1 to 9) showing the first embodiment, 11 (FIGS. 1, 2 and 7) are main body suspension rings attached to the four corners of the reinforcing member 4, and 12 (FIGS. 1 and 2). , FIG. 3, FIG.
9] is a mooring ring attached to the sinker box 6,
13 (FIGS. 1, 2, and 9) is also the sinker box 6
4 is a boring equipment mounted on the work platform F.

The drawing shown in the second embodiment (FIGS. 10 to 10)
19), 34 (FIG. 10, FIG. 11, FIG. 12, FIG. 13, FIG. 16, FIG. 17, FIG. 18, FIG. 19) was attached so as to be inserted into the pair of left and right attachment members 33, 33. Mooring ring, 35 [Figs. 10, 12, 13 and 1
4, FIG. 16, FIG. 17, and FIG. 18] are two upper and lower frame bodies 2.
It is a suspension ring attached to the four corners of 1, 22.

As shown by 36 in FIGS. 11 and 19 showing the second embodiment, a pair of leg pieces 23, 23.
Or (and) a good idea to attach the anticorrosion plate 24, 24 the outer surface of the.

[0046]

Effects of the Invention According to the present invention Symbol mounting, the peripheral portion
A sinker box 6 in which a plurality of sinkers are arranged
Between the bearing portion 3 and the bearing portion 3 arranged below the peripheral edge thereof.
There is an interval of, and the bory that vertically penetrates the sinker body.
Bottom near the center of the sinker body corresponding to the periphery of the pipes E
Since the part is a relatively large space 2, the weight of the sinker does not act on the ground at the point of the boring hole, which is drilled by the boring pipes E. It is effective in conducting tests and collecting undisturbed soil samples.

According to the second aspect of the present invention, even if the sinker installed on the ground is soft and sinks below the ground G, a sinker, which is a heavy load, is included. Since the pressure of the bottom of the sinker box 6 that is present does not directly act on the ground G, and it is possible to prevent earth pressure from being applied to the sinking sinker as much as possible, it is possible to obtain soil data under natural earth pressure conditions. In obtaining and sampling of, and performing boring work under natural conditions,
The effect is that there is no hindrance.

According to the third aspect of the invention, there is an effect that the weight of the sinker body can be reduced. Further, there is an effect that the place of installation of the sinker that can descend the boring pipes E is not greatly limited.

According to the fourth aspect of the invention, there is an effect that the sinker body, which tends to become large in size, is separated and reduced in size, and can be transported by a truck or the like.

According to the fifth aspect of the present invention, the weight of the sinker can be supported at a position considerably distant from the boring hole formed by the boring pipes E, and the boring or the raw material can be supported under natural conditions. It has the effect of being able to perform a position test and to collect undisturbed soil samples.

According to the sixth aspect of the present invention, the long boring pipes E descending toward the sinker sunk on the seabed can be reliably guided to a predetermined position of the sinker and penetrated vertically. There is.

[Brief description of drawings]

FIG. 1 is an overall plan view showing a first embodiment of a sinker for a spar buoy type boring tower according to the present invention,

FIG. 2 is a front view showing a part thereof by cutting.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front view showing a usage state of the sinker according to the first embodiment,

FIG. 5 is an enlarged cross-sectional view showing a situation near the seabed in that case,

FIG. 6 is a plan view taken along line VI-VI of FIG. 2, showing only a bearing portion provided at the bottom of the sinker;

FIG. 7 is a plan view taken along the line VII-VII of FIG. 2, showing only the lower reinforcing member located on the bearing portion ;

FIG. 8 is a plan view taken along line VIII-VIII of FIG. 2, showing only the upper-stage reinforcing member located above the lower-stage reinforcing member;

FIG. 9 is a plan view of only the sinker box arranged on the upper reinforcing member,

FIG. 10 is an overall plan view showing a second embodiment of the sinker for a super buoy type boring tower according to the present invention,

FIG. 11 is a front view thereof,

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a plan view showing only the upper frame body,

FIG. 14 is a plan view showing only a lower frame body;

FIG. 15 is a front view showing a usage state of the sinker according to the second embodiment,

FIG. 16 is an enlarged cross-sectional view showing a situation near the seabed in that case,

FIG. 17 is a cross-sectional view for explaining an advantage when the sinker according to the second embodiment is installed on an inclined ground;

FIG. 18 is a plan view of the entire sinker showing a modification of the second embodiment.

FIG. 19 is a front view thereof.

[Explanation of symbols]

1 bowling pipes penetrates the upper and lower portions 2 space 3 Bearing unit 4b, 5b strip-shaped plate 6 sinker box 8 sinker 21, 22 the frame 23 and 24 legs 3 'Bearing unit 8' sinker A buoyant body B marker mast Body C Mooring device E Boring pipes F Work platform G Ground

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Mitsuaki Yokomine 4-2-6 Kudankita 4-chome, Chiyoda-ku, Tokyo Within Geological Co., Ltd. (72) Tsuneaki Iwasaki 4-26-6 Kudankita, Chiyoda-ku, Tokyo No. Applied Geotechnical Co., Ltd. (72) Inventor Hitoshi Nakazawa 4-2-6 Kudankita, Chiyoda-ku, Tokyo Within Applied Geotechnical Co., Ltd. (72) Tadahiro Arimura 2-176 Minami Toyoshima, Ikeda, Osaka Prefecture No.1 Zenilite buoy Co., Ltd. (72) Inventor Junichi Harada No. 2-176, Toyoshimaminami, Ikeda-shi, Osaka No. 1 Zenilite buoy Co., Ltd. (56) Reference JP-A-58-76688 (JP, A) 190392 (JP, U)

Claims (6)

[Claims] 1. A work platform F is provided on the top of a pillar B.
A buoyant body A is provided in the middle of the pillar body B,
The lower end is moored to the sinker by a mooring device C so as to be tiltable,
The buoyancy body A is drawn into the water, and the pillar body B above the buoyancy body A
Spurbuoy type bowling with a water line in the middle of
In the sinker of the turret, the sinker is fitted with a plurality of sinkers at the periphery.
, And boring pipes E penetrate vertically in the center.
A sinker box 6 provided with a through portion 1 and the sinker box 6.
-Place at a predetermined distance below the edge of the box 6.
Bearing pressure for supporting the weight of the sinker box 6 on the seabed.
Constituted by the parts 3, the sinker central near the bottom, the spar buoy type boring tower for sinker, characterized in that it comprises a relatively large space 2. And wherein said pressure bearing portion 3, band-shaped plate stiffeners was allowed positioned above the inner side of said supporting pressure section 3 a between the sinker box 6 arranged above at a predetermined distance and then, the spar buoy type boring tower for sinker according to claim 1, wherein it is arranged so as to be perpendicular to the ground G. 3. A work platform F is provided on the top of the pillar B.
A buoyant body A is provided in the middle of the pillar body B,
The lower end is moored to the sinker by a mooring device C so as to be tiltable,
The buoyancy body A is drawn into the water, and the pillar body B above the buoyancy body A
Spurbuoy type bowling with a water line in the middle of
In the sinker of a turret, the sinker is composed of two upper and lower frame bodies 21 and 22 intersecting in a plane cross shape, and both frame bodies are outside the portion 1 through which the boring pipes E pass vertically. Two
A pair of leg pieces 23, 23, 24, 24 are provided on the bottoms of the legs 1, 22 respectively, and inside the respective leg pieces 23, 23, 24, 24 and below the intersection of the two upper and lower frame bodies 21, 22. Spare buoy type boring tower sinker characterized by having a relatively large space 2 in the vicinity. 4. The sinker for a spar buoy type boring turret according to claim 3 , wherein the two upper and lower frames 21 and 22 are separable. The bottom of wherein said leg 23,23,24,24, claim 3 also provided with a bearing capacity portion 3 'for supporting the sinker weight
Is the sinker for the spar buoy type boring turret described in 4 . 6. The sinker for a spar buoy type boring turret according to claim 1, wherein a cone 9 for guiding the boring pipes is arranged in a portion 1 through which the boring pipes E pass vertically.