JPS6234912B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for an underwater boring device, and more particularly to a support device that stably holds a support pipe supporting the boring device away from the seabed ground at the beginning of boring.

Traditionally, when performing underwater boring, a tower with four pillars was used as a support device to mount and support the boring equipment from the viewpoint of stability.
In some cases, installation was difficult, and there were limits to where they could be used, making them not very practical. Therefore, in recent years, a single support pipe has been used as a support pipe that is not affected much by the shape of the ground or by tidal currents and can be easily assembled. That is, in this boring method for single-column scaffolding using one support pipe, as shown in Fig. 3, a support pipe 1 is erected on the seabed ground, and a casing pipe 2 for retaining earth is fitted inside the pipe. The core tube for drilling and the sampling tube for soil sampling are attached to the tip of the rod at the appropriate time, and the casing pipe 2
A drilling rod 3 which is inserted into the shaft and can be driven up and down and rotatably, and rotation of the drilling rod 3;
A boring device a consisting of an elevating drive unit and the like is installed via a workbench 4 at the upper end of the support pipe 1 for construction.

In this case, the support pipe 1 must be stably erected on the seabed ground A. Conventionally, the support pipe 1 is driven perpendicularly into the seabed ground A to an appropriate depth, and a support stand is installed in advance at the bottom of the support pipe 1. The frame 5a is placed on the ground A, and a plurality of anchor wires 6, one end of which is tied to the upper part of the support pipe 1, are extended radially, and the free ends of the anchors 6a are locked to the ground A, thereby forming the support pipe. 1 had already been stably established.

By the way, in the underwater boring method, in order to obtain accurate soil test results, the collected soil materials are tested and sampled in an undisturbed state, where the layers, density, etc. are undisturbed. It's important. However, in conventional construction methods,
First, in order to stably install the support pipe, the support pipe is driven into the seabed ground, so although there is no disturbance in the layer or density of the ground below the driving depth, considerable disturbance occurs in the surface layer of the ground. was. Therefore, when collecting samples from the ground below the driving support pipe, it is possible to divide the ground up to a predetermined depth in an undisturbed state by repeatedly drilling a hole with a core tube and pushing the sampling tube, but the surface layer corresponding to the initial driving depth of the support pipe The samples were tested and collected in a disturbed state, and could not be used as accurate samples for soil testing.

In view of the above-mentioned drawbacks of the conventional art, the present invention has been made to improve the conventional drawbacks.
Provided is a device that can test and sample soil in the surface layer of the ground at the part where the support pipe is driven in an undisturbed state, and that can stably hold the support pipe during the collection. The purpose is to

That is, the present invention does not drive support pipes before sampling soil materials from the surface layer of seabed ground, but instead holds the support pipes vertically away from the ground during surface soil sampling, and the surface soil can be sampled smoothly. It was designed to be carried out.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the configuration of the present invention shown in the drawings will be described below.

As shown in FIG. 1, a protrusion 10 is provided in the shape of a key on the lower outer peripheral surface of the support pipe 1, and an annular stopper 11 is fitted and fixed to the support pipe 1 in contact with the upper end of the protrusion 10. In order to maintain the balance of the pipe, the number of the protrusions 10 is two or about three as shown in the figure. Further, the protrusion 10 is provided above the lower end of the pipe, leaving a length approximately corresponding to the driving depth of the support pipe 1 into the seabed ground A. Reference numeral 5 denotes a support frame, which is an annular pedestal 12 as shown in the figure.
In addition, a disk-shaped top plate 13 is supported by a plurality of support rods 14 arranged around the pedestal 12 and assembled into an underframe. As shown in the figure, the support pipe 1 is loosely inserted into the center of the upper plate 13, and a guide hole 15 with a diameter slightly larger than that of the support pipe 1 is provided to guide the vertical movement of the support pipe 1. A concave groove 16 into which the protrusion 10 of the support pipe 1 fits and guides the movement of the support pipe 1 is formed.

As a result, when the support pipe 1 is inserted into the guide hole 15 of the top plate 13 of the support frame 5, the protrusion 10
As shown in the figure, the lower end is locked to the edge of the guide hole 13, or as shown in FIG.
It fits into the groove 16 provided on the edge of the mouth. Support frame 5
When the support pipe 1 loosely inserted into the guide hole 15 is placed on the ground and the protrusion 10 is locked in the guide hole 15 as described above, the support pipe 1 is held on the underframe 5 in a state floating from the pedestal 12, and When the protrusion 10 is inserted into the groove 16, the support pipe 1 slides down until the stopper 11 comes into contact with the top plate 13 due to the engagement between the groove 16 and the protrusion 10.

When performing underwater boring with the above configuration, the guide holes 1 of the upper plate 13 of the support frame 5 are prepared in advance.
5, the lower end of the support pipe 1 is loosely inserted into the support pipe 1, and the support frame 5 is placed on the submarine ground at a predetermined location with the support pipe 1 in a vertical position. Then guide hole 1
As shown in FIG. 1, the support pipe 1 which has been slightly loosely inserted into the support frame 5 is fixed to the mouth edge of the guide hole 15, and the support pipe 1 is inserted into the support frame 5 in a state away from the seabed ground A. hold by. At the same time, a plurality of anchor wires 6 tied to the upper part of the support pipe 1 are anchored to the seabed ground A and stretched radially in accordance with the conventional construction method shown in FIG. As a result, the support pipe 1 is held vertically in a substantially balanced manner by being held by the top plate 13 of the support frame 5 and pulled by the anchor wire 6, although it is suspended in the air. In order to ensure that the support pipe is held vertically, the top plate of the support frame may be formed into a double plate with a space between the top and bottom, or the guide hole thereof may be formed into a cylindrical shape. Next, as described above, a test rod rod 3 is inserted through the lower end opening of the casing pipe 2 installed inside the support pipe 1 held vertically.
The sampling tube attached to the tip is inserted into the surface layer of the seabed. As a result, the soil material from the ground surface to the depth of the cylinder length is collected in the sampling cylinder in an undisturbed state. After sampling, the sampling tube is pulled up together with the test rod to the workbench 4, and the collected sample is taken out from the tube and stored for inspection. Then, the sampling tube is again pushed into the hole where the first sample was taken, and the test rod is penetrated into the lower soil layer to collect the soil material in that area. Repeat this to remove the protrusion 1 of the support pipe 1.
Sample the surface ground to a depth approximately equivalent to the length of the pipe below 0. As a result, a portion of the surface layer of the ground corresponding to the driving depth of the support pipe is sampled without disturbance. When the sampling of the surface layer of the ground is completed in this way, the support pipe 1 is rotated an appropriate amount, and the protrusion 10 that is engaged with the rim of the guide hole 15 is inserted into the guide hole 1.
5 to match the concave groove 16 of No. 5. Since the protrusion 10 is now fitted into the groove 16, the support pipe 1 slides down until the stopper 11 comes into contact with the top plate 13, as shown in FIG. Along with this, the support pipe 1 is pushed into the hole of the ground extraction site in the surface layer, and becomes in the same driving state as before, and is stably erected. Also,
When the support pipe 1 falls, the support pipe 1 is held even more firmly by the support frame 5 due to the stopper 11 coming into contact with the top plate 13 of the support frame 5, and the support pipe 1 will not sink due to its own weight or vibration during the subsequent ground sampling work. Never. After the support pipe is erected at the initial sample collection site as described above, the ground sample below is taken by alternately using the drilling rod, core tube, and sampling cylinder as before. Ground sampling can be easily carried out in an undisturbed state by driving a support pipe into a solid installation.

As explained above, the present invention provides a device in which a boring device is supported by a single support pipe, and the support pipe is erected on the seabed ground to carry out boring work. A support frame is constructed by assembling a top plate with holes and a pedestal fixed on the seabed ground, and the support pipe is held through the guide hole of the support frame, and the lower end of the support pipe is set at the depth of the pipe driving. A plurality of protrusions are provided on the outer circumferential surface of the pipe above the pipe, leaving a length corresponding to When the strip is locked, it is supported away from the seabed ground, and when the protruding strip is inserted into the groove, it slides down from the guide hole and is driven into the ground.The support pipe can be supported above the ground by the support frame, which is the first of its kind in the past. Collecting samples from the undisturbed surface of the seabed, which was impossible due to pipe installation by driving support pipes from the ground, is extremely easy by pushing the sampling tube attached to the tip of the test rod directly into the surface of the ground. will be carried out reliably. Moreover, according to the present invention, the support pipe is securely held in the support frame by inserting it into the guide hole of the support top plate and by locking the protrusion to the top plate, and also by using a plurality of anchor wires. Since it is supported by its radial tension, it is stably held vertically even if it is far from the ground, and sampling of the surface layer of the ground can be carried out smoothly, and subsequent sampling below the surface layer is locked. By rotating the support pipe and fitting the protrusion into the recessed groove, the support pipe slides down and is driven into the ground, so it can be easily driven in a stable upright position in the same way as conventional support pipe driving.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are examples of the present invention, and
Each figure shows how to use the apparatus, each figure A is a front view thereof, each figure B is a plan view thereof, and FIG. 3 is a front view showing the supporting state of the boring apparatus. 1...Support pipe, 5...Support frame, 10...Protrusion,
12...Pedestal, 13...Top plate, 15...Guide hole, 1
6... Groove, A... Seabed ground.

Claims (1)

[Claims] 1. In a device in which a boring device is supported by a single support pipe, and the support pipe is placed upright on the seabed ground to carry out boring work, the top plate is provided with a guide hole having a concave groove on the mouth edge. A support frame is assembled with a pedestal that is fixed on the seabed and a frame body.
The support pipe is held through the guide hole, and a plurality of protrusions are provided on the outer circumferential surface of the pipe above the lower end of the support pipe, leaving a length corresponding to the pipe driving depth. By locking the protrusion to the mouth edge of the guide hole or fitting it into the groove, the support pipe can be supported away from the seabed ground when the protrusion is locked, and it can be prevented from sliding out of the guide hole when the protrusion is inserted into the groove. A support device for an underwater boring device, characterized in that it is driven into the ground.