JPS6238513B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a guide pipe that guides the insertion of a casing pipe and a drilling rod for drilling into underwater ground from above the water. This invention relates to a guide pipe support device for water boring.

When drilling into underwater ground from above the water, it is necessary to install a guide pipe vertically at the drilling point, insert a casing pipe and a drilling rod into the guide pipe, and rotate and propel the drilling rod. Traditionally, when performing water boring, a tower or artificial island was built on the water depending on the scale of the drilling.
This was carried out by methods such as using these as work bases. However, constructing towers and artificial islands is a huge economic burden and the work is difficult.

Therefore, a method has been implemented in which a guide pipe is directly penetrated into the underwater ground from above the water, the support force of the ground is used to make the guide pipe a solid structure, and a casing pipe and a drilling rod are inserted into this guide pipe to perform underwater boring. . However, when the bottom of the water is soft, the guide pipe often penetrates to a depth beyond its allowable limit due to its own weight and other forces. Also, a large force is required to pull up the guide pipe and its fixing device that have penetrated the ground.

The object of the present invention is to be suitable for underwater boring of soft underwater ground, to prevent the guide pipe or its substitute from penetrating beyond the desired depth, to avoid excessive power required for withdrawal, and to improve the slope of the underwater ground. To provide a guide pipe support device for water boring that can follow the same conditions.

The guide pipe support device for floating boring according to the present invention connects the lowest single pipe of the guide pipe through which a casing pipe for floating boring and a drilling rod are inserted and guides, and allows the device to enter perpendicularly into soft underwater ground up to the middle part thereof. an embedded tube connected to the tip of the support tube and having a length such that the tip reaches a desired depth below the bottom surface of the water; It consists of a central part near the joint with the support tube and a peripheral part divided into three or more parts, each peripheral part being hinged to the central part, and each divided peripheral part being above the central part surface. This device is characterized by a support plate that is designed not to rotate.

In a preferred embodiment of the guide pipe support device for water boring according to the present invention, the means for preventing rotation of each divided peripheral edge portion above the central portion surface extends above the central portion to the rotation position of the divided peripheral edge portion. It is made up of multiple beams welded together.

In a further preferred embodiment of the guide pipe support device for water boring according to the present invention, the support pipe and the support plate are rigidly connected by welding,
Or further, a rib is provided between the support tube and the support plate, and in another preferred embodiment, the support tube and the support plate each have a ball joint and a spherical seat, and the ball joint and the spherical seat provide a rib. , the support plate is tiltably joined to the support tube.

Hereinafter, the apparatus according to the present invention will be described in the first embodiment of the drawings.
This will be explained based on the diagram.

This support device consists of a support tube 1, an embedded tube 2, and a support plate 3. The support pipe 1 is vertically inserted into the soft underwater ground up to its intermediate portion (support plate mounting position). The upper flange 1A of the support tube 1 is joined to the flange of the single tube 4 at the lowest stage of the guide pipe. The guide pipe is formed by successively connecting the lowermost single pipe 4 to the lowermost single pipe 4 and making the uppermost single pipe protrude above the water surface. The embedded pipe 2 is joined to the lower flange 1B of the support pipe 1, and has a length such that its tip reaches a desired depth below the water bottom surface.

The support plate 3 surrounds the peripheral wall of the intermediate portion of the support tube 1 and is joined to the support tube 1 . In the embodiment shown in FIG. 1, the support plate 3 is rigidly connected perpendicularly to the support tube 1 by welding, and is further reinforced with ribs 5. The size of the support plate 3 is appropriately determined depending on the bearing capacity of the underwater ground, the weight of the guide pipe, and the magnitude of other loads applied to the support plate 3. The strength of the support plate 3 may be increased by dividing the support tube 1 into upper and lower parts, rigidly connecting the support plate 3 as an upper end flange of the lower support tube, and joining the upper support tube thereon. Further, the diameters of the upper and lower support tubes may be different.

The support plate 3 consists of a central portion 3A near the joint with the support tube 1 and a peripheral portion 3B divided into three or more pieces (four pieces in the embodiment). Each peripheral portion 3B is hinged to the central portion 3A by a pin 6.
Further, on the upper side of the support plate center portion 3A, there is a divided peripheral edge portion 3B.
Two beams 7 in each of the X and Y directions extending to the rotational position are welded so as to be orthogonal to each other.

The support plate 3 is divided into a central portion 3A and a peripheral portion 3B,
Since the peripheral edge 3B can be hung down by a hinge, the bearing capacity of the bottom surface of the water is smaller than expected, and the supporting plate 3
If the guide pipe support means penetrates into the ground to some extent, the guide pipe support means can be easily pulled up. Furthermore, if necessary, by suspending the beam 7 with a hanging wire or chain 8, the beam 7 can be reinforced when the guide pipe support means is pulled up. Even if the peripheral edge 3B of the support plate 3 hangs down, as this support means is grounded to the underwater ground and the embedded pipe 2 and the support pipe 1 penetrate into the ground, the peripheral edge 3
B is rotated, and the center part 3A is rotated by the beam 7.
Since it is designed not to rotate above the surface of
The effect is the same as that of a single support plate that is not joined by split hinges.

FIG. 2 shows another embodiment of the device of this invention.
In this embodiment, the support tube 1 has a ball joint 9, the support plate 3 has a spherical seat 10, and the support plate 3 is tiltably joined to the support tube 1 by the ball joint 9 and the spherical seat 10. There is. The attachment portion of the spherical seat 10 to the support plate 3 is reinforced with ribs 11.

The device of the embodiment shown in Fig. 2 can make the support plate 3 follow the slope of the underwater ground even if the underwater ground is sloped, so the load of the guide pipe etc. is smoothly transmitted to the ground and the device is stabilized. It can be done. Furthermore, even if there is a hard rock or the like in the ground and the support plate 3 is pressed against it, the angle of the support plate 3 can be changed freely, so that no tilting force is exerted on the guide pipe.

The guide pipe support device for underwater boring of the present invention is constructed and operates as described above, so that when installed on a soft underwater ground, the guide pipe does not penetrate beyond the desired depth, which may impede sampling. No problems occur. Furthermore, even if the support plate goes underground, the lifting power will not be excessive because it hangs down at the hinge portion when being lifted up. Furthermore, when using a ball-and-socket joint and a spherical seat, it is possible to follow the slope of the underwater ground surface, and even if there is a hard part of the ground, the support plate can be tilted accordingly. Therefore, the load of the guide pipe etc. can be smoothly transmitted to the ground and the guide pipe can be firmly supported.

[Brief explanation of the drawing]

1a, b and 2 show different embodiments of the apparatus of the present invention, FIGS. 1a and 2 are longitudinal cross-sectional views, and FIG. 1b is an A in FIG. 1a.
-A sectional view taken along line A. 1... Support tube, 2... Embedded tube, 3... Support plate, 3a...
Central part, 3B...Peripheral part, 4...Single guide pipe,
6...pin, 7...beam, 9...ball joint, 10...spherical seat.

Claims (1)

[Scope of Claims] 1. A support pipe that connects the lowermost single pipe of a guide pipe through which a casing pipe for underwater boring and a drilling rod are inserted, and is allowed to enter perpendicularly into soft underwater ground up to its intermediate portion; an embedded tube that is connected to the tip of the support tube and has a length such that the tip reaches a desired depth below the water bottom surface; It consists of a central part near the joint with the main part and a peripheral part divided into three or more parts, each peripheral part is hinged to the central part, and each divided peripheral part is prevented from rotating above the central part surface. A guide pipe support device for water boring, characterized by comprising a support plate with a fixed diameter and a support plate with a fixed diameter. 2. Claim 1, wherein the means for preventing the rotation of each divided peripheral edge part above the central part surface is a plurality of beams welded to the upper side of the central part, extending to the divided peripheral part rotation position. Sectional equipment. 3. The device according to claim 1 or 2, wherein the support tube and the support plate are rigidly connected by welding, or a rib is further provided between the support tube and the support plate. 4. Claim 1 or 2, wherein the support tube and the support plate each have a ball joint and a spherical seat, and the support plate is tiltably joined to the support tube by the ball joint and the spherical seat. Sectional equipment.