JPS5851089B2 - Offshore pile cap treatment method - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method for trimming the heads of steel pipe piles driven underwater, and in particular, a method for trimming the heads of steel pipe piles near the water surface using a device equipped with a cutting machine, a float, and a leveling rod. This method involves inserting this device into the head of the steel pipe pile, adjusting its height to the standard height from the outside, and then fixing the cutting machine inside the steel pipe to cut the head of the pile. , the pile cap can be processed with excellent efficiency, which brings significant economic effects to the construction of port structures.

In recent years, with the proliferation of ships and maritime transportation, the demand for the development of coastal ports and cargo handling facilities is increasing year by year.

Traditionally, this has been dealt with by coastal reclamation, but
Landfill methods have been on the decline in recent years due to strict regulations from the perspective of environmental conservation, etc.
Therefore, in the future, it will be necessary to deal with the increasing demand for port facilities by other methods.

Therefore, the conditions required for a method to replace landfilling are that it be an economical method and that the construction period can be shortened.

Shortening the construction period, especially shortening the on-site offshore construction, is important in order to deal with the congestion of maritime transportation, which in turn leads to improved safety and cost reduction.

Based on the above, it is expected that demand for port structures based on pile foundations will increase in the future as an alternative to landfill.

In the case of pile foundations, pile cap treatment is always required, and especially considering that port structures tend to become larger year by year, it is desirable to develop a construction method that is both accurate and efficient. There is.

As one of these pile foundation structures, there is a method in which a superstructure is towed as a floating box onto a pile foundation driven in water, and the superstructure is submerged with ballast.

In this case, it was extremely difficult to perform pile cap treatment accurately and efficiently because the work was done underwater, and because the work was done near the water surface, it was easily affected by waves.

This invention is particularly intended to solve these problems in pile cap treatment.

The purpose of this invention is to precisely trim the pile heads near the water surface of steel pipe piles driven underwater, and it is also an object of this invention to cut the pile heads as quickly as possible. A further object of the present invention is to efficiently carry out pile cap treatment in a short period of time, and a further object of the invention is to (1) ensure the safety of workers and reduce labor. .

That is, in the present invention, as in the illustrated embodiment, in a pipe pile 1 driven in the sea, a pile head processing device 2 is inserted into the head of the pipe pile 1, and a pile head processing device 2 is inserted into the processing device 2 to cut the pile pipe. cutting machine 3;
It is equipped with a float 4 that gives buoyancy to the device and a leveling rod 5 that displays the height position of the device, and by adjusting the ballast of the float 4 while using the same leveling rod as a standard, the height of the device 2 can be adjusted to a desired height. A method for treating pile caps at sea is characterized in that after adjustment and determination are made to reach the desired level, a cutting machine 3 is fixed to the inner surface of the pile pipe, and then the cutting machine 3 is operated to cut the pile caps. .

The principle of the method according to this invention will be explained with reference to the drawings.

In FIG. 1, a pile head processing device 2 inserted into a steel pipe pile 1
consists of a cutting machine 3, a float 4, and a leveling rod 5 connected together.

The leveling rod 5 may be something like a tape measure.

6 is the sea surface, and 7 is the water surface inside the steel pipe pile 1.

The pile head processing device 2 is suspended by a crane and inserted into the steel pipe pile 1 as shown in FIG. 2, and the float 4 is ballast-adjusted until it reaches the regular height while being regulated by level 8.

9 is a ballast adjustment hose.

After the adjustment is completed, as shown in Fig. 3, the inner surface of the steel pipe 1 is stretched with the jacks 10 and 11 attached to the cutting machine 3, and the cutting machine 3 is fixed on the steel pipe 1, and then the pile head is disconnect.

Next, embodiments of the invention will be described.

Example 1 "Method for cutting steel pipes protruding above the water surface" In Figures 4 and 5, move the cursor 12 to the target position.
is set, and the entire pile head processing device 2 is suspended from a crane with a wire 15 and inserted into the steel pipe pile 1.

After landing on the water, adjust the air inside float 4 and move cursor 1.
2 until it reaches the reference point.

When the cursor 12 reaches the reference point, immediately stop the air supply and exhaust in the float 4, fix it with jacks 10 and 11, and then
Cutting is performed using the cutting machine 3.

Note that the cut-off pile cap portion is integrated with the float 4 by an upper jack 10, and can be removed together with the float 4 by loosening the lower jack 11.

13 is a reference line, 14 is a cutting line, 16 is a guide roller, 17
are hydraulic hoses.

Embodiment (2) "Automation of measurement and vertical operation" FIG. 6 is an example in which a laser sensor 18 is used on the upper part of the float 4.

The laser sensor 18 is suitably structured to have a circular prism on its outer periphery so as to capture the laser beam 19 from all directions.

A laser sight 20 is installed at a specific point on the sea or on land,
Align the sight to the center of float 4.

To explain the operating procedure, first, the valve 22 of the supply/exhaust hose 21 of the float 4 is opened manually.

Then, since the lower part of the float 4 is in an open state due to the water supply and drainage hole 25, the float 4 starts to sink under its own weight.

When the laser sensor 18 matches the level of the laser sight 20, the solenoid valve 23 is closed by the feedback current from the sensor 18, and the float 4 stops sinking.

Further, when the sensor 18 is lower than the level of the sight 20, the valve 22 is opened, the valve 23 is closed, and the valve 24 is opened to send air into the float 4 from the air pressure source 26.

Then, the float 4 starts to rise, and when the sensor 18 matches the level, the solenoid valve 24 is closed by feedback.
The rise ends.

Through these series of operations, the horizontal position measurement of the float 4 can be automated, and work efficiency and labor savings can be fully demonstrated.

Example (3) "Method of cutting a steel pipe protruding above the water surface" Figure 7 shows that the vertical movement of the float itself is the same as in Example (1) above.
The procedure is similar to that described above, but in this case, a guide cylinder 27 having a tapered upper part is used instead of the guide roller.

The cylinder support 28 is made to match the inner diameter of the steel pipe pile 1 in advance.The cylinder support 28 is integrated with the guide cylinder 27, and the guide cylinder 27 is adjusted in advance to the inner diameter of the steel pipe pile 1. It is attached to the top of 1.

After that, the cutting machine 3 and the float 4 are inserted, but they are guided by the inner surface of the guide cylinder 27 and guided easily into the steel pipe 1, and are further supported by the guide rollers 29 provided in the guide cylinder 27, making it extremely smooth. to reach the desired softness.

Example (4) "Method for cutting a steel pipe protruding above the water surface" This example is the same in principle as Examples (1) and (2) above, but the float part is a bellows type flow) 4a. , it is possible to obtain a sedimentation distance according to the purpose.

Figure 8 shows 7FK that when the cutting line 14 is close to the sea level 6, the bellows should be folded and used.

FIG. 9 shows that when the cutting line 14 is relatively deeper than the sea level 6, the bellows is ll+f and the surveying ball 5a is also extended.

13 is a reference line. Embodiment (5) "Method for cutting steel pipes under water" In Figs. 10 and 11, in this embodiment, instead of suspending the entire pile cap processing equipment with a crane, an appropriate number of external flows 31a, 31b, . . . are used.

First, the processing device 2 is combined with the insertion tool 30, floated on the sea with the inner and outer floats 4.degree. 31a, 31b, . . . filled with air, and towed to the top of the steel pipe pile 1.

Float 3 below the external float above the steel pipe pile 1
1a, confirm that the steel pipe pile 1 is inside the guide 32 of the insertion tool 30, and then also water the upper flow) 31b to fit the insertion tool 30 onto the steel pipe pile 1 and fix it.

This stabilizes the water surface 7 inside the steel pipe.

After the insertion tool 30 is fixed, water is poured into the float 4 and cutting is performed in the same manner as in Example (1).

After cutting, the external float 31 is filled with air and floated together with the cut steel pipe.

If the cut steel pipe is large, this method of increasing the number of external floats 31 can be combined with the method of Example (2) above, making it possible to significantly reduce the number of personnel.

"Method for Cutting Steel Pipe Under Water" Next, FIGS. 12 to 14 show modifications of FIGS. 10 and 11.

In FIGS. 12 to 14, the insertion tool 30 is towed in the same manner as in the embodiment (5) and fitted into the steel pipe pile 1.

After fixing to the steel pipe pile 1, move the cursor 12 to the reference position,
The winch 33 suspending the cutting machine 3 is operated, and when the cutting machine 3 descends to the target cutting line 14, the winch 33 automatically stops.

Thereafter, the cutting machine 3 is operated to determine the individual parts and perform cutting.

In FIGS. 13 and 14, one end of the tape measure 34 is fixed to the cutting machine 3, and the upper end is wound onto a reel 35 provided on the insertion tool 30 with a constant force.

Therefore, in advance, a tape measure 3 corresponding to the distance h that becomes the reference line 13 is
Since a stopper 36 is provided at position 4 and a microswitch is provided there as a limit switch 37, the winch 33 can be automatically stopped.

Example (6) "Method of cutting above the water surface" FIG. 15 shows an example of cutting a steel pipe pile 1 protruding above the water surface above the water surface.

Conventionally, scaffolding is erected on the water surface, but this is not necessary with the cutting machine 3 with the float 4, and the work can be carried out simply by following the same procedure as in Example (1).

As shown in Fig. 15, the basic components are as in Example (1).
This is the same as above, but the leveling rod 5 and hanging metal fittings 38 are placed on the top level, the cutting machine 3 is placed on the middle level, and the float 4 is placed on the bottom level.

It is also applicable to cut at sea level or relatively shallowly below sea level by lowering the water level inside the steel pipe pile 1 in advance using a submersible pump or the like.

As is clear from the above description, the present invention provides many effects as listed below.

(1) To trim pile heads below or near sea level,
Conventional underwater cutting by divers, etc. requires scaffolding, etc., and efficiency and accuracy are extremely low due to tidal currents, waves, etc., but according to this invention, the inside of the steel pipe pile can be cut. The water level is always calm, unaffected by waves, etc.
This allows highly accurate level management.

(2) Since a series of operations from measurement to cutting can be managed continuously, work can be performed extremely efficiently.

Therefore, the larger the scale, the more the construction period can be significantly shortened and the more economical effects can be achieved.

(3) An automatic system can be achieved by linking the measurement and the up and down operation of the float, thereby making it possible to achieve even higher efficiency and increasing the above-mentioned economic effects.

(4) By applying this method, it can be widely applied from pile caps on the sea surface to pile cutting near the seabed.
This can be said to be a versatile method.

(5) Compared to conventional methods, it is possible to significantly save labor at sea.

Therefore, in addition to reducing costs due to efficiency, there is also a significant economic effect due to the reduction in the number of workers.

Furthermore, by reducing the amount of manual work involved, the safety of dangerous maritime work can be significantly improved.

[Brief explanation of drawings]

Figures 1 to 3 are elevation views showing the procedure of pile cap treatment, Figures 4 and 5 are elevation views of Example (1), and Figure 6 is an elevation view of Example (2). Figure 7 is an elevation view of implementation example (3), Figures 8 and 9 are elevation views of embodiment (4), and Figures 10 and 11 are elevation views of embodiment (5). Figures 12 to 14
The figure is an elevational view of the modification, and FIG. 15 is an elevational view of the embodiment (6). In the figure, 1 is a steel pipe pile, 2 is a pile head treatment device, 3 is a cutting machine, and 4
, 4a is a float, 5 is a leveling rod, 12 is a cursor, 14 is a cutting line, 18 is a laser sensor, 23.24 is a solenoid valve, 3
1 is an external float.

Claims (1)

[Scope of Claims] 1. In a pipe pile driven in the sea, a pile head processing device is inserted into the head of the pipe pile, and the processing device includes a cutting machine that cuts the pile pipe and a buoyancy that imparts buoyancy to the device. It is equipped with a float that displays the height position of the device and a leveling rod that displays the height position of the device, and while using the same leveling rod as a standard,
After adjusting the height of the device to the desired level by adjusting the balance of the float, the cutting machine is fixed to the inner surface of the pile pipe, and then the cutting machine is operated to cut the pile cap. A marine pile cap processing method characterized by cutting. 2. The offshore pile cap processing method according to claim 1, wherein the pile cap processing device is inserted into the pile cap by being suspended by a crane. 3. The offshore pile cap processing method according to claim 1, wherein the pile cap processing device is inserted by transporting it to the top of the target pipe pile using an insertion tool equipped with an external float. 4. The offshore pile cap processing method according to claim 1, wherein the reference point of the leveling rod is a cursor placed at a known height from the cutting line. 5. The offshore pile cap processing method according to claim 1, wherein the adjustment of the ballast of the float is performed by automatically operating a solenoid valve in the air supply pipe of the float using a feedback current from a laser sensor attached to a leveling rod. 6. The marine pile cap processing method according to claim 1, wherein the float is configured to be expandable and contractible in a bellows-like form.