JPH0483016A - Emergency hyfraulic unit for dolly - Google Patents

Abstract

PURPOSE:To always maintain gripping force and prevent the collapse of a dolly by attendantly providing a device for supplying oil pressure to the hydraulic steel sheet pile gripping device of a dolly for water bottom piling construction at the time of oil pressure lowering. CONSTITUTION:A dolly 11 is provided which has a hydraulic chuck 11b for gripping a steel pipe sheet pile 8 and an expansion type supporter 21. Next a normal service hydraulic unit 32 is loaded on a working vessel, and oil pressure is supplied from a hydraulic pump 32b to the hydraulic cylinder 11b-1 of the chuck 11b and the support cylinder 21b of the supporter 21. Then an emergency unit 33, composed of a high pressure gas tank 33a, an electromagnetic valve 33b, and an air pump 33e, etc., is provided, and is e.g. loaded on a float to be attendantly provided on the dolly 11. At the time of work stoppage, the unit 33 is connected to the cylinders 11b-1 and 21d, and oil pressure lowering is automatically detected to supply oil pressure. This can prevent dolly collapse due to waves, etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for attaching a Yatco to the top of a steel pipe pile driven into the ground under water and leaving it for a long time (at least several hours). The present invention relates to an emergency hydraulic unit configured to be able to supply pressure oil to a hydraulic cylinder provided therein when the hydraulic pressure in the cylinder decreases.

In civil engineering, a yatko is a column-shaped tool that is attached to the top of a pile when driving the pile into water or the ground surface.

Yatko is generally called ``scissors'' or ``yatoko''.
It is also sometimes used with the character . Originally, it meant gold scissors used for making large Kajiya.

For example, when performing vibrating pile driving, the Yatco is interposed and fixed between the vibrating device and the pile, and transmits vibrations to the pile.

[Conventional technology]

A vibrating device used in civil engineering construction work is generally a bridge structure in which multiple pairs of rotating shafts to which eccentric weights are attached are arranged in parallel.

According to such a configuration, it is possible to add the excitation force of the eccentric weight rotating in the opposite direction in a desired direction, and cancel it out in an unnecessary direction.

FIG. 3(A) is a schematic diagram showing vibrating pile driving work on land.

The vibration device 1 is suspended by a crane (not shown).

A chuck device 2 is fixed to the lower end of the vibration device 1. 3 is a flange joint that is fastened using bolts and nuts.

The chuck device 2 described above grips the top of the pile 4 and brings the lower end of the core 3 into contact with the ground 5.

The vibration device 1 includes a drive machine (not shown) such as an electric motor, rotates an eccentric weight (not shown), and generates vertical vibration.

The above vibration is transmitted to the pile 4 via the flange joint 3 and the chuck device 2, and the core 4 sinks into the ground 5 due to its own weight and vibration. FIG.

Reference numeral 1 designates the vibrating device explained in connection with the figure (A), 2 the same chuck device, and 3' the same flange joint.

6 is the water surface.

The conventional Yatco 7 has its top fixed to the vibrating device ri 11 by a flange joint 3', and grips the pile 4 by a chuck device 2 provided at its lower end.

Specifically, the pile 4 shown in this schematic diagram (FIG. 3(B)) may be a concrete pile, a steel pipe pile, or a steel sheet pile or a steel pipe sheet pile.

FIG. 4 is a schematic diagram showing a construction method in which a large number of steel pipe sheet piles 8 are lined up and driven into the underwater ground 5'.

9 drawn between adjacent steel pipe sheet piles 8 is a joint between the steel pipe sheet piles. An enlarged cross-section of the same is shown in FIG.

FIG. 5 (A) shows a two-port type joint, (B) shows a pipe T-type joint, and (C) shows a pipe-type joint.

(A) In the two-port type joint shown in the figure, a joint 9a having a C-shaped cross section is welded to one steel pipe sheet pile 8, and a T-shaped joint 9b to the other steel pipe sheet pile 8'.

(B) The pipe T-type joint shown in the figure has one steel pipe sheet pile 8
A joint 9c having an arcuate shape with a nearly circular cross section is welded to the other steel pipe sheet pile 8', and a joint 9d having a T-shaped cross section is welded to the other steel pipe sheet pile 8'.

(C) In the pipe-shaped joint shown in the figure, arcuate joints 9e each having a nearly circular shape are welded and fixed to both the steel pipe sheet pile 8 on one side and the steel pipe sheet pile 8' on the other side.

Although any type of joint can be used, pipe-type joints are becoming popular because there is no distinction between male and female joints, and because they have good water-stopping properties.

In the work shown in FIG. 4(A), when driving a large number of sheet piles 8 one after another, the joints 9 must be engaged and driven.
The top must protrude above the water surface 6 as shown in Figure (A).

This is because if the top is submerged below the water surface, the joint 9 cannot be engaged even if the next sheet pile is driven in.

However, depending on the specifications of the underwater structure or the working conditions, the top of the steel pipe sheet pile 8' may have to be lower than the water surface 6 by the amount of depth, as shown in FIG. 4(B).

In such a case, in the prior art, the steel pipe sheet piles 8 had to be placed side by side as shown in FIG. 4(A) and then cut underwater along the line c-c' shown in the figure. .

The above-mentioned work involving underwater cutting not only wastes a great deal of time and labor, but also results in cutting off the upper part of the steel pipe pile, which is unfavorable from the standpoint of resource economy.

Therefore, it is desired to perform underwater driving of sheet piles using a Yatco, which was used for individual pile driving in the conventional technology.

FIG. 6 is an explanatory diagram showing a construction method in which steel pipe sheet piles are lined up and driven under the water using a Yatco.

This construction method is based on an unknown invention created by the present inventors.

(A) of FIG. 6 shows a state in which a large number of steel pipe sheet piles 8, 8', 8', 8a, .

Driving of steel pipe piles 8.8' and 8' has been completed.

Although the steel pipe piles 8a, 8b, and 8c have been driven, the YATCO piles 7a, 7b, and 7c are still attached to them, respectively.

The steel pipe pile 8d that is about to be driven is erected with its top suspended from the crane hook 9 via the jack 7d.

To connect the Yatco 7d and the main pile, connect the main pile to the pile keeper.
etc., to connect the joint pipes.

(B) As shown in the figure, the vibrating device 1 is attached to the head of the Yatko 7d (it is gripped by the chuck device @2 explained in Fig. 3), and vibration driving is performed as shown in the figure (C).

In this case, the management (falling down) of piles (including sheet piles).

(Inclination, etc.) Check the fall and inclination of the YATCO to ensure pile driving accuracy.

The figure (D) shows a state in which the steel pipe sheet pile 8d has been driven to a predetermined depth.

The steel pipe sheet pile 8d that has been driven to the specified depth is Yatco 7d.
Leave it attached. In this state, the steel pipe pile 8d is under the water surface and it is not easy to confirm its position, so the Yatko 7d is attached to the steel pipe pile 8d to serve as a marker.

(E) As shown in figure (F), the YATCO 7a is lifted up by detaching it from the steel pipe pile 8a that has been partially driven, and the next steel pipe sheet pile 8e is suspended by this YATCO 7a as shown in (F). , perform construction using Yatco 7d as a guide.

Comparing the state in figure (F) with figure (A) above.

It is the same except that the names indicating the order of steel pipe sheet piles and Yatco have been changed. In this way, one cycle of the process proceeds, and one steel pipe sheet pile is driven in each cycle.

However, when trying to implement the unknown invention construction method described with reference to FIGS. 6(A) to 6(F), it is difficult to perform the construction using the conventional YATCO method (FIG. 3) for the following reasons.

That is, in Figures (A), (E), and (F), the robot that is working during each step of the construction method explained in Figure 6 is directly suspended by the crane hook 9. (B
), (C), and (D), the vibration device 1 is attached.

Therefore, in the conventional YATCO 7 shown in FIG. 3(B), which has a structure in which the vibration device 1 is fastened with bolts and nuts via a flange joint 3', it is difficult to change the setup of each process. It wastes a lot of time and effort, and is uneconomical.

In view of the above-mentioned circumstances, it is necessary to construct a kit suitable for carrying out the unknown construction method shown in FIG.

A chuck device for piles (including sheet piles) is provided at one end in the longitudinal direction (lower end when in use), and the other end (upper end when in use) has a structure that can be gripped by the chuck of the vibrating device, and It is effective to provide a sheet pile joint corresponding to the sheet pile joint provided on the above-mentioned pile on the side surface.

Yatco with the above configuration was created by the present inventors and is an invention that is being filed separately (filed on June 6, 1990) by the present applicant (hereinafter referred to as the invention of the first prior application).

According to the configuration of the invention of the first prior application, the vibrating device can be freely attached to and detached from the upper end of the Yatco (via the chuck).

Therefore, it is possible to remove the vibrating device from the robot and leave the device alone for a while, and at the same time, it is possible to grip another robot with the vibrating device.

Furthermore, if a vibration device is attached to the Yatco while holding the sheet pile with the Yatco, it becomes possible to lift the Yatco via the vibrating device, and also to lift the piles gripped by the Chuck of the Yatco together. .

In this way, it becomes possible to implement the unknown invention method described with reference to FIGS. 6(A) to 6(F).

FIG. 7 shows an embodiment of the Yatco according to the invention of the first prior application, in which FIG. 7(A) is a side view and FIG. 7(B) is a front view.

The Yatco 11 of this example is provided with a chuck llb for the steel pipe sheet pile 8 at the lower end of the main body pile 11a.

The upper end portion 11c of this Yatco 11 is a gripping portion that can be gripped by a chuck device 2 attached to the vibration device 1.

Comparing this structure with the conventional example (Fig. 3), we find that the conventional YATCO 7 has a pile chuck device 2 at its lower end.
However, its upper end cannot be gripped by the chuck device 2 of the vibration device 1.

In contrast, the Yatco 11 of this example can grip and release the steel pipe sheet pile 8 with the chuck llb at its lower end, and the upper end can be gripped and released by the chuck group [2] of the vibration device 1. It is structured so that it can be released.

Furthermore, this Yatco 11 is provided with a sheet pile joint lid in the longitudinal direction on its side surface.

The format of the above sheet pile joint lid is, for example, from Fig. 5(A) to
Any of the various types of sheet pile joints shown in (C) may be used, but as shown in FIGS. It is of the same type as the joint 9, and is configured to be aligned on the same straight line as the steel pipe sheet pile joint 9.

In FIG. 7(A), which is a side view, the width Wl of the chuck Ilb and the width W2 of the chuck device 2 are larger than the rectangular dimensions d and L of the steel pipe sheet pile 8, and they protrude outward. In FIG. 7(B) which is a front view, the steel pipe sheet pile 8
The thickness dimension T1 of the chuck llb is compared with the diameter dimension of the four holes.
Also, the thickness dimension T2 of the chuck device 2 is small and does not protrude laterally.

As mentioned above, in the front view (Fig. 7(B)), II
The steel pipe sheet pile joint 9 of the I pipe sheet pile 8 and the sheet pile joint II'd of the YATCO 11 are arranged in a straight line.

Therefore, the width dimension T of the chuck llb of this Yatco 11
I is smaller than the diameter d2 of the main body rod 11a of the Yatco 11, and does not protrude laterally.

In this way, YATCO 11's chuck llb.

In the front view, the fact that it does not protrude laterally compared to the main body rod 11a means that when each of the plurality of steel pipe sheet piles 8 is gripped by the Yatko 11 and arranged in a row, any of the Yatko 1
This setting is made so that the first chuck Ilb does not interfere with the adjacent YATSU and also does not interfere with the steel pipe sheet piles held by the adjacent YATSU.

As can be easily understood by comparing and contrasting FIGS. 7(A) and 7(B), the chuck llb of Yatco 11 is.

The steel pipe sheet pile 8 is held in the diametrical direction. Specifically, the steel pipe sheet pile joint 9 is clamped in a direction perpendicular to the direction in which it is arranged (the direction perpendicular to the plane of the paper in Fig. 7 (A), the left-right direction in Fig. 7 (B)), and the so-called two-point support is used. It will be held in the shape of

Next, using the Yatco 11 configured as described above,
An example of use in which steel pipe sheet piles are placed side by side on the bottom of the water will be explained.

FIG. 8 is a process explanatory diagram of this usage example.

A large number of steel pipe sheet piles are driven into the water bottom 5' located below the water surface 6.

In FIG. 8(A), 8.8' and 8' are existing steel pipe sheet piles.

8a, 8b, and 8c are steel pipe sheet piles that have been driven in this order and have not yet been subjected to post-processing (removal of the pipes).

Reference numeral 11 indicates the Yatcos described with reference to FIG. 7, and in this usage example, there are four Yatcos 11A.

11B, 11C, and IID were used in turn.

YATCO IIA is still holding the steel pipe sheet pile 8a and driving the steel pipe sheet pile 8a into it, and has not been removed yet.

Yatco IIB has not yet been removed, with the steel pipe sheet pile 8b still being driven in while holding the steel pipe arrow 8b.

The YATCO 11C is still holding the steel pipe sheet pile 8c and driving the steel pipe sheet pile 8c into it, and has not yet been removed.

The steel pipe sheet piles 8d to be placed side by side on the steel pipe sheet piles 8C are clamped by the chuck llb of the YATCO 11D, and the gripping portion 11C of the YATCO 11D is gripped by the chuck device E2 of the vibration device 1.

The above-mentioned vibrating device 1 is attached to a crane 9 via a swing hanging device 10.
' (only a part of the pulley and wire rope are shown), and lowered it with the top of Yatco 11C protruding above the water surface 6 as a target, and attached steel pipe sheet pile 8d to the sheet pile joint lid of Yatco 11C. The steel pipe sheet pile joint 9 is engaged with the steel pipe sheet pile joint 9, and the steel pipe sheet pile joint 9 is suspended while sliding along the sheet pile joint lid.

With Yatco 11C holding the steel pipe sheet pile 8c,
Since the sheet pile joint lid of the Yatco 11C and the steel pipe sheet pile joint 9 of the steel pipe sheet pile 8c are aligned, the steel pipe sheet pile joint 9 of the suspended steel pipe sheet pile 8d is as shown in FIG. 8(B). It slides from the sheet pile joint lid of Yatco 11C to the steel pipe sheet pile joint 9 of the steel pipe sheet pile 8c and is engaged.

Furthermore, the Yatko 11D and the steel pipe sheet pile 8d held by the Yatko 11D are suspended, the lower end of the steel pipe sheet pile 8d is brought into contact with the water bottom 5' (see FIG. 8(C)), and the vibration device 11 is activated. Perform vibration casting work.

In this way, the steel pipe sheet piles 8d are accurately positioned via the steel pipe sheet pile joints 9 with respect to the steel pipe sheet piles 8c, and are driven in rows.

At this time, as explained in FIG. 7, the steel pipe sheet pile 8
The thickness dimension (the dimension in the left-right direction in FIG. 8) of the chuck llb of the YATCO 11D that grips the YATCO 11D does not protrude sideways from the main body rod 11a of the YATCO 11D, so it does not interfere with the YATCO 11C, and The work progresses smoothly without interfering with the steel pipe sheet pile 8C.

As shown in Fig. 8 CD), when the steel pipe sheet pile 8d is driven to a predetermined position, the operation of the vibrating device 1 is stopped, the grip of the chuck device 2 gripping the Yatco 11D is released, and the As shown in Figure (E), the vibration device 1 and the chuck device 2 attached thereto are lifted up.

The chuck device 2 grips the YATCO IIA as shown in FIG. 8 CF), the grip of the steel pipe sheet pile 8a by the chuck 11A of the YATCO 11A is released, and the YATCO IIA is hoisted by the crane 9'.

Using the chuck llb of the Yatco 11A lifted as described above, grip and lift a new steel pipe sheet pile 8e as shown in FIG. .

The steel pipe sheet pile joint 9 of the steel pipe sheet pile 8e is engaged with the sheet pile joint lid of the YATCO 11D, slides down guided by the sheet pile joint 11d, and slides into the steel pipe sheet pile joint 9 of the steel pipe sheet pile 8d. In this way, the steel pipe sheet pile 8e is accurately guided to a position adjacent to the steel pipe sheet pile 8d.

Comparing this Fig. 8 (G) with Fig. 8 (B) mentioned above, we find that the steel pipe sheet pile 8d that is about to be driven in Fig. 8 (B) has already been driven in Fig. 8 (G). In the figure (G), a steel pipe sheet pile 8e is about to be driven next to (along with) the steel pipe sheet pile 8d.

In Figure (B), 3 were used and unrecovered.
Among the YATCO IIA, IIB, and IIC in the book, YATCO 11A, which had been used the earliest, is being used again, and (B) YATCO 11D, which was in use in the figure.
In the figure (G), it is used and unrecovered.

That is, the state shown in FIG. 8(G) is a state in which one cycle of steps has progressed compared to the state shown in FIG. 8(B) described above.

In this way, the four Yatcos 11A, 11B, II
Collect and reuse C and IID in turn.

A large number of steel pipe sheet piles 88 to 88 were recovered and reused to the bottom of the water.
They are lined up and poured.

In this usage example, four Yatcos were used in turn,
When using the Yatco of the present invention, at least two Yatco are used alternately one after another, and one Yatco is always attached to the already cast steel pipe sheet pile so that its top protrudes above the water surface 6. Yatco sheet pile joint lid protruding
In this way, the steel pipe sheet pile joint 9 of the steel pipe sheet pile 8 in the next step can be positioned and guided.

However, as shown in the usage examples shown in Figure 8 (A) to (G), four Yatco IIA to IID are used to always place three or more used and unrecovered Yatco on top of the already driven sheet piles. If it is attached to and left in place, the three or more Yatcos are connected via the sheet pile joint lid and support each other, so the resistance against waves is large and stable.

When driving piles (including sheet piles) using a vibrating device,
Techniques for suspending the vibrating device via vibration isolating hangers are well known. If this known technology is applied, the lifting force can be reduced from the state in which the vibration device is suspended by a crane via the anti-vibration hoist (
(or zero) and operate the vibration device to perform vibration driving.

Therefore, in the state shown in FIG. 8(C), vibration driving can be performed while the crane 9' and the vibration device 1 are connected via the vibration isolating hanger 10, and as shown in FIG. 8(D). Release the grip of the chuck device 2 of the vibration device 1 as shown in Fig. 8 (F
), the chuck device 2 allows the user to switch to Yatco IIA. The relationship between the possibility of such operations and the configuration shown in FIG. 7 will be described below with reference to FIGS. 8 and 6.

Figures 6 (A) to (F) schematically show the idea of an unknown invention method created by the present inventor.
Until now, the equipment for implementing this has not been completed.

Figures 8 (A) to (G) schematically depict the actual process at the stage where the idea of the above-mentioned invented construction method was made practicable using the Yatco for underwater pile driving work according to the invention of the first prior application. 1, and as mentioned in the next section, there are some differences between FIG. 8 and FIG. 6.

In FIG. 6(A) showing the idea, the Yatko 7d is directly suspended by the crane 9, and
In D), the crane 9 is separated from the Yatco 7d, and the vibration device 1 is attached to the top of the Yatco 7d. In Fig. 6(E), the vibration device 1
The crane 9 lifts the Yatco 7a while leaving it on the top of the Yatco 7d.

In contrast, the seventh embodiment, which is an embodiment of the invention related to the first priority,
In the configuration shown in the figure, the vibration-proof suspension 10 suspended by the crane 9' and the vibration device 1 suspended by the vibration-proof suspension 10 are firmly connected and cannot be easily attached or detached.

Then, a gripping portion 11c is attached to the top of the YATCO 11 so that the YATCO 11 can be adapted to the chuck device 2 which is conventionally configured to grip a steel pipe pile (including sheet piles). It is a provision.

In Figures (C:) and (D) of Fig. 8, which show the construction method in which the Yatco 11 of this example is actually used, the vibration device 1 connected to the crane 9' via the anti-vibration hanging device 10 is used. , gripping the Yatco 11D via the chuck device 2 and vibration-driving the steel pipe sheet pile 8d.

In FIG. 8(E), the chucking device 2 shows the
0, and as shown in (F) the chuck device 2.
Then switch to YATCO 11A and lift YATCO IIA.

A new steel pipe sheet pile 8e was created by lifting Yatco IIA.
When it is grasped and lowered to a predetermined position (FIG. 8 (G)), the steel pipe sheet pile 8e can be vibrated and driven through the Yatco 11A.

In this way, in FIG. 6 (illustrating the idea), the crane 9 is used to change the grip of the lifting partner member, while in FIG. effect has been achieved.

The main reason why such a usage is possible and why such an action and effect has been achieved (see Fig. 7) is that the steel pipe sheet pile 8 can be held in the removable interior by the chuck llb provided at the lower end of the YATCO 11. This is because the top part of the Yatco 11 is configured to be detachably gripped by the chuck device 2 of the vibrating device.

The reason why a large number of steel pipe sheet piles can be lined up and easily driven in the correct position is that a sheet pile joint lid corresponding to the steel pipe sheet pile joint 9 of the steel pipe sheet pile 8 is provided on the side of the YATCO 11.

As explained above, according to the underwater pile driving YATCO according to the invention of the first prior application, a large number of steel pipe sheet piles are lined up and driven into the water bottom, and the tops of the large number of steel pipe sheet piles are driven below the water surface. Moreover, the positioning of the steel pipe sheet pile to be driven is quick and easy.

It was confirmed that this can be done with high precision.

The present inventors further carried out practical test research on the Yatco for underwater pile driving work according to the invention of the earlier application, and as a result, discovered that there are points that require further improvement as described below.

No. 7 showing an embodiment of Yatco according to the invention of the earlier application.
A cross section taken along line 1--2 in Figure (B) is as shown in Figure 9 (A).

That is, when a plurality of steel pipe sheet piles 8 are arranged in a row in the X-axis direction, the chuck 1lb (provided at the lower end of the YATCO 11) according to the invention of the earlier application is arranged facing in the Y-axis direction. be positioned.

(This figure 9 is a schematic explanatory diagram, and the steel pipe sheet pile joint 9
are omitted).

For this reason, when waves in an oblique direction as shown by arrow W collide with the boat that is fixed on the steel pipe sheet pile 8 with the chuck llb, the boat will be knocked down.

In order to withstand the force of such waves, it is conceivable to arrange two pairs of chucks Ilb perpendicular to each other, as shown in Figure 9 (B), but it is possible to This is not practical because the chucks 11b interfere with each other as shown with dots.

Furthermore, as shown in FIG. 9(C), it is also conceivable to install three chucks Ilb radially for one YATCO. However, according to this plan, the direction of use of Yatco must be considered when using it one after another, making construction management extremely complicated.

Moreover, it is not easy to avoid interference at the locations marked with K because there is too little margin in terms of design and construction practice.

In view of the above-mentioned circumstances, without impeding the effects of the Yatco of the invention of the first prior application, further improvements have been made so that the Yatco can be installed in zero rows without the risk of falling even when subjected to diagonal waves. There is no fear that the YATCO chucks fixed to each of the steel pipe sheet piles will interfere with each other, and there is no particular restriction on the direction when using the YATCO. A configuration for providing a YATCO for underwater piling work. As.

A chuck device for piles is provided at one end in the longitudinal direction, and the other end can be gripped by a chuck of a vibration device, and a joint for sheet piles is provided in the longitudinal direction along the side surface. It is a Yatco for underwater pile driving work.

An expandable supporter that is inserted into the pile and expanded is provided at one end where the pile chuck device is provided, and when the supporter is expanded, it is crimped to the inner surface of the pile, and the YATCO and the pile are A structure in which the two are fixed to each other is effective. The above configuration is an invention created by the present inventors and filed separately by the present applicant (hereinafter referred to as the second prior application).

A YATCO equipped with a supporter configured as described above is fixed to a steel pipe pile by pressing it inside, rather than gripping the steel pipe pile from the outside. Therefore, there is no possibility that the supporters will interfere with each other between adjacent YATCOs.

Since the Yatko is fixed to the steel pipe pile (including sheet piles) as described above, there is no fear that the Yatko will be knocked down even if it is hit by waves from any direction.

In addition, by eliminating the gap between the steel pipe pile and the gripping device, damage to the steel pipe pile can be prevented, and stress due to wave force applied to the YATCO can be dispersed, resulting in a strong YATCO support.

FIG. 10 shows an embodiment of the Yatco for underwater pile driving work according to the invention of the second prior application.

This embodiment is an improvement by applying the invention of the second prior application to the Yatco of the embodiment of the invention of the first prior application shown in FIG. FIG. 10 is a side view corresponding to FIG. 7(B) according to the invention of the tenth prior application.

In FIG. 10, the same drawing reference numbers as in FIG. 7(B) are given to the same or similar components as in the invention of the first prior application.

This embodiment (FIG. 10) differs from the embodiment of the first prior application shown in FIG. 7(B) in that an expandable supporter 21 is provided at the lower end of the YATCO 11.

For example, there are two types of brakes for vehicles: an externally retractable type and an internally expandable type, both of which are publicly known and in use. The expandable supporter in the invention of the second prior application has a similar structure to the internal expandable brake, and is inserted into the steel pipe sheet pile 8,
When expanded, it is strongly pressed against the inner circumferential surface of the steel pipe sheet pile.

The expandable supporter 21 of this example has two pairs of expansion levers 21a.
, 21b are provided. FIG. 11 shows enlarged details of the core.

FIG. 11(A) is an enlarged detailed view of the part ■ shown surrounded by a chain line in FIG. 10, and FIG. 11(B) is a BB sectional view of FIG. 11(A).

11b is a chuck similar to that in the invention of the first prior application, and is configured to grip and lift the steel pipe sheet pile 8.

A guiding and reinforcing plate 8p is provided at the upper end of the steel pipe sheet pile 8 along a plane including its center line.

Reference numeral 22 denotes a pair of guides fixed to the lower end of the main body rod 11a of the YATCO 11, which are members that guide the YATCO 11 so as to be concentric with the fRM sheet pile 8.

As shown in FIG. 11(A), a pair of expansion levers 21a
, 21b are tiltably supported by a shaft 21c relative to the lower end of the Yatco main body rod 11a.

A cylinder 21d is interposed and connected between each of the expansion levers 21a, 21b and the guide 22.

The cylinder 21d is supplied with hydraulic pressure via a hydraulic hose and a control valve (both not shown) to expand and contract, and moves the expansion levers 21a and 21b with the reciprocating circular arc arrow 21a.
, 21b'.

By reducing the expansion levers 21a and 21b, the steel pipe sheet pile 8
When inserted inside and expanded, Yatco 11 and steel pipe sheet pile 8
are supported so that they remain concentric.

Here, while the aforementioned chuck llb is locally crimped against the steel pipe sheet pile 8 and has the function of suspending its weight, the expansion levers 21a and 21b are attached to the inner surface of the steel pipe sheet pile 8. On the other hand, since it has a relatively long contact length Lc, it has an excellent function of maintaining the posture of the YATCO 11 with the steel pipe sheet pile 8 as a reference.

Specifically, it is as follows. That is, in a state where the steel pipe sheet pile 8 is driven and fixed on the underwater ground, the expanded supporter 21 supports the YATCO 11 concentrically with the steel pipe sheet pile 8, and functions to prevent misalignment.

Therefore, Yatko is supported so that it will not fall even if it is subjected to the force of waves.

As can be easily understood from Fig. 10, the YATCO for underwater pile driving work of this example has an expanded supporter in addition to the embodiment (FIG. 7) of the YATCO for underwater pile driving work according to the invention of the first prior application. Since it is a juxtaposed structure, the unique effect of the invention of the first prior application is that ``a large number of steel pipe sheet piles can be placed side by side on the bottom of the water, the tops of which can be driven under the water surface, and the positioning of the steel pipe sheet piles is easy. It has all the advantages of "Koto".

[Problem to be solved by the invention]

The present inventors are able to arrange a large number of steel pipe sheet piles and drive them so that their tops are below the water surface.

The steel pipe sheet pile to be driven can be positioned quickly and easily with high precision, and it is also excellent in practical use because there is no risk of the sheet pile collapsing even if the force of waves is applied to the sheet pile from any direction. Although it was confirmed that it was effective, further practical testing and research revealed that there was room for improvement as described below.

That is, for example, as shown in FIG. 12, a steel pipe sheet pile 8 is driven into the underwater ground 5', a Yatco 11 is attached thereon, and the top thereof is kept protruding above the water surface 6 for a considerable period of time (
(for example, for several days or longer).

Of course, work will be suspended at night and on holidays, but there may also be suspensions for several days due to coordination with other related construction work.

As shown in FIG. 12, while gripping the steel pipe sheet pile 8 with the chuck llb,
If 1a and 21b are left expanded for a long time,
Hydraulic cylinder and expansion lever 2 of the chuck llb
It cannot be said that there are cases in which the pressure oil in the hydraulic cylinders 1a and 21b leaks, resulting in a pressure drop.

In this way, if the sea becomes rough with the holding force of the cylinder reduced due to oil leakage, the Yatco 11 will be knocked down by the force of the waves.

When the sea is rough like this, work boats cannot approach the area, so it is not possible to check the oil pressure level or replenish the pressure oil.

The present invention has been made in view of the above-mentioned circumstances.

When the holding oil pressure of the hydraulic cylinder for the chuck or the hydraulic cylinder for the expandable supporter installed on the Yatco decreases, pressure oil can be automatically replenished, and furthermore,
The purpose is to provide an emergency hydraulic unit that does not require external energy supply during operation.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a hydraulic cylinder of a pile chuck device installed in Yatco, and
A hydraulic pump connected to at least one of the hydraulic cylinders of the internally expandable supporter provided in the YATCO, a power source for rotationally driving the hydraulic pump, and means for storing energy to be supplied to the power source. It is characterized by having the following.

When carrying out the present invention, it is advantageous to provide a pressure-sensitive switch that operates by detecting the pressure oil held in the hydraulic cylinder, and to operate the power source when the oil pressure drops. It is.

Furthermore, if an air pump is used as the power source and a high-pressure gas cylinder is used as the energy storage means,
It is easy to replenish high pressure gas as an energy source (
When the seas are not rough, it is convenient to replenish compressed air from the work boat).

In the present invention, the air pump is not an air pump in the narrow sense, but refers to a pump that is driven by pressurized gas and discharges high-pressure oil.

Furthermore, if a DC motor is used as the power source and a storage battery or fuel cell is used as the energy storage means,
It is easy to control the output of the power source.

It is convenient for the hydraulic pump, power source, and energy storage means, together with their accessories, to be mounted on a float or housed in a waterproof case and mounted on the top of the Yatco.

[Effect]

According to the above configuration, since the hydraulic pump, its power source, and energy storage means are provided in the emergency hydraulic unit, there is no need to receive energy supply from the outside (for example, power supply via a power transmission line). It is possible to replenish the holding hydraulic pressure to the hydraulic cylinder of the chuck device and the hydraulic cylinder of the expandable supporter by activating the power source and rotating the hydraulic pump.

〔Example〕

FIG. 1 is a hydraulic and pneumatic system diagram including an embodiment of an emergency/normal hydraulic unit according to the present invention.

The chuck cylinder 1 l b-+ shown in the upper right of the figure is a hydraulic cylinder that operates the chuck llb of the YATCO 11 in the second prior application shown in FIG.

Further, the supporter cylinder 21d is a hydraulic cylinder for expanding the expandable supporter 21 shown in FIG. 11 above.

The above hydraulic cylinders 1lb-x and 21d are connected to a regular hydraulic unit 32 via a coupler 31a during normal operation.

The above-mentioned regular hydraulic unit 32 is mounted on a work boat (not shown), and supplies pressure oil discharged from a hydraulic pump 32b driven by a drive motor 32a to the above-mentioned cylinders 1lb-x and 21d via an operating valve V. supply to.

32c is a hydraulic oil tank.

The above cylinders 1lb-t and 21d are also configured to be detachably connected to the emergency hydraulic unit 33 via a coupler 31a and a hydraulic hose 31b.

This emergency hydraulic unit 33 includes a high pressure gas tank 33a.
It is equipped with

The high pressure gas tank 33a of this example is a nitrogen gas cylinder (capacity 3°4Q) equipped with a 5 kg/d pressure reducing valve 33a-1.
may be a compressed air tank.

The high-pressure nitrogen gas having pressure energy stored in the high-pressure gas tank 33a is supplied to the air pump 33e and the preliminary air pump 33f via the solenoid valve 33b (control of the solenoid valve 33b will be described later).

The air pump 33e of this example has a discharge rate of 1.4 Q/min at a discharge pressure of 210 kg/d.

The work of driving steel pipe sheet piles was stopped, and the regular hydraulic unit 32 installed on one work boat was moved to the chuck cylinder l l b.
-t or when disconnecting from the support cylinder 21d, the discharge ports of the air pumps 33e and 33f of the emergency hydraulic unit 33 are connected to the coupler 31a.

Hydraulic cylinder 1 l b-+ via hydraulic hose 31b
.

21d.

When the pressure in the pipeline becomes less than 210 kg/cd, the gas in the high-pressure gas tank 33a (reduced to 5 kg/d) is supplied to the air pump 33e, and the air pump 33e is activated.

33i is a hydraulic oil tank.

The pressure oil discharged from the air pump 33e is supplied to the cylinders 1lb-x and 21d while being pressure regulated by a pressure regulating valve 33h.

The air pump 33f is a backup air pump provided as a backup for the air pump 33e.

Now, suppose that due to some kind of malfunction, the oil pressure does not recover and the pressure gradually decreases. In such a case, 170 kg/a
! When the temperature is below, the solenoid valve 33b is operated to the position (b) and the spare air pump 33f is operated.

The equipment constituting the emergency hydraulic unit explained above with reference to FIG. 1 is housed in a case and mounted on the float 34 as shown in FIG. I'll keep it.

As a result, even if the Yatco 11 is attached to the steel pipe sheet pile 8 and left for a long time, the hydraulic cylinder of the chuck device flllb and the hydraulic cylinder of the expandable supporter (hidden in Fig. 2 (A)) can be used. The holding oil pressure is always 210kg/
d or more (even in the unlikely event of a failure, it is maintained at 170 cg/aJ or more), and the Yatco 11 is firmly fixed to the steel pipe sheet pile 8.

There is no risk of Yatko 11 being knocked down by the waves.

FIG. 2(B) shows an embodiment different from FIG. 2(A).

In this example, the emergency hydraulic unit 33 is housed in a waterproof case and fixed to the top of the Yatco 11.

〔Effect of the invention〕

As explained above, when the emergency unit according to the present invention is applied to a YATCO equipped with a pile chuck device and an expandable supporter, the YATCO is attached to a steel pipe pile (including sheet piles) and left for a long time. Also, since the holding hydraulic pressure of the hydraulic cylinder of the chuck device and the hydraulic cylinder of the expandable supporter does not decrease, it has an excellent practical effect in that there is no risk of the Yatko being knocked down by waves, and it contributes to the advancement of underwater pile driving technology. It's a huge amount.

[Brief explanation of the drawing]

FIG. 1 is a pneumatic and hydraulic system diagram showing an embodiment of an emergency hydraulic unit according to the present invention. FIGS. 2(A) and 2(B) are external perspective views showing the usage state of the above embodiment, respectively. FIG. 3 is an explanatory diagram of the conventional pile driving method, where (A) shows pile driving on land and (B) shows pile driving under water. FIGS. 4(A) and 4(B) are explanatory diagrams of problems in the conventional underwater pile driving method. FIG. 5 is an explanatory diagram of a steel pipe sheet pile joint, in which (A) shows a two-port type joint, (B) a T-type joint, and (C) a pipe-type joint. FIGS. 6(A) to 6(F) are explanatory diagrams of an unknown underwater pile driving method. FIG. 7 is an explanatory diagram of an embodiment of the invention relating to the first order of precedence. FIGS. 8(A) to 8(G) are explanatory views of how to use the embodiment according to the invention of the first prior application. FIG. 9 is an explanatory diagram of the problem in the invention related to the first prior application. Fig. 10 is a side view showing the Yatco according to the invention of the second prior application, Fig. 11(A) is an enlarged detailed view of the part ■, Fig. 11C
B) is the BB sectional view. FIG. 12 is an explanatory diagram of the problem in YATCO related to the invention of the second prior application. 1... Vibration device, 2... Chuck device, 3, 3'.
...Flange joint, 4...Steel pipe pile, 5...Ground, 5
′... Water bottom ground, 6... Water surface, 7... Conventional Yatco, 8... Steel pipe sheet pile, 9... Steel pipe sheet pile joint, 1
0... Anti-vibration hanging tool, 11... Yatco of the example, ll
a...Body rod, 11b...Chuck, lie...
Gripping portion, lld... Sheet pile joint, 21... Expandable supporter, 21a, 21b... Expansion lever, 21c...
Shaft, 21d... Cylinder, 22... Guide, 31a
...Coupler 31b...Hydraulic hose, 32...
- Regular hydraulic unit, 32a... Drive motor, 32b
...Hydraulic pump, 33...Emergency hydraulic unit, 3
3a... High pressure gas tank, 33b... Solenoid valve, 33
e...Air pump, 33f...Spare air pump,
33g...Pressure sensitive switch, 33h...Pressure regulating valve, 33
i...Hydraulic oil tank, 34...Float.

Claims (1)

[Scope of Claims] 1. A hydraulic pump connected to at least one of the hydraulic cylinder of the pile chuck device installed on YATCO and the hydraulic cylinder of the internal expansion type supporter installed on YATCO. An emergency hydraulic unit for Yatco, comprising: a power source for rotationally driving the hydraulic pump; and means for storing energy to be supplied to the power source. 2. The hydraulic cylinder is equipped with a pressure sensitive switch, and the pressure sensitive switch is turned on when the pressure falls below a predetermined pressure to operate the power source of the hydraulic pump. Emergency hydraulic unit for Yatco described in item 1. 3. The emergency hydraulic unit for Yatco according to claim 1, wherein the power source is an air pump driven by pressurized gas, and the energy storage means is a high-pressure gas cylinder. 4. The emergency hydraulic unit for Yatco according to claim 1, wherein the power source is a DC motor, and the energy storage means is a storage battery or a fuel cell. 5. The above-mentioned hydraulic pump, power source, and energy storage means are mounted on a float together with the attached parts of these devices, and are equipped with a high-pressure oil hose for connection to Yatco. The emergency hydraulic unit for Yatco according to claim 1. 6. Claim 1, wherein the hydraulic pump, the power source, and the energy storage means are housed together in a waterproof case together with the attached parts of these devices, and can be mounted near the top of the Yatco. Emergency hydraulic unit for Yatco described in .