JPH06104973B2 - Emergency hydraulic unit for Yatco - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a case where a yatco is inserted into the top of a steel pipe pile placed on the ground of the water bottom and left for a long time (at least several hours). The present invention relates to an emergency hydraulic unit configured to supply pressure oil to the hydraulic cylinder when the hydraulic pressure in the hydraulic cylinder decreases.

In civil engineering, a yatco is a pillar-shaped tool that is added to the top of a pile when it is driven below the water surface or below the ground surface.

Yatco generally refers to "scissors," or "arrow octopus."
Sometimes it is used by applying the character. Originally, it was the meaning of a pair of scissors used to make fire on a fire.

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

[Conventional technology]

A vibration device used in civil engineering construction work generally has a structure in which a plurality of pairs of rotating shafts having eccentric weights are arranged in parallel.

According to such a configuration, the exciting force of the eccentric weight rotating in the opposite direction can be added in the desired direction and can be canceled in the unnecessary direction.

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

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

The chuck device 2 is fixed to the lower end of the vibrating device 1. Reference numeral 3 is a flange joint that is fastened using bolts and nuts.

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

The vibration device 1 has a built-in drive device (not shown) such as an electric motor and rotates an eccentric weight (not shown) to generate vertical vibration.

The above-mentioned vibration is transmitted to the pile 4 through the flange joint 3 and the chuck device 2, and the pile 4 sinks into the ground 5 due to its own weight and vibration. It is a schematic diagram which shows the operation | work which drives 4.

Reference numeral 1 is a vibrating device described with reference to FIG. (A), 2 is a chuck device, and 3'is a flange joint.

6 is the water surface.

The top portion of the conventional yatco 7 is fixed to the vibrating device 1 by the flange joint 3 ', and the pile 4 is gripped by the chuck device 2 provided at the lower end portion thereof.

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

FIG. 4 is a schematic diagram showing a construction method when a large number of steel pipe sheet piles 8 are arranged and driven on the water bottom ground 5 '.

Reference numeral 9 drawn between the adjacent steel pipe sheet piles 8 is a joint of the steel pipe sheet piles. The V-V cross section is enlarged and shown in FIG.
FIG. 5 (A) is a two-port type joint, (B) is a pipe T type joint, and (C) is a pipe type joint.

In the two-port type joint shown in FIG. 7A, a joint 9a having a C-shaped cross section is welded to one steel pipe sheet pile 8 and a T-shaped joint 9b is welded to the other steel pipe sheet pile 8 '.

(B) The pipe T-shaped joint shown in FIG.
An arc-shaped joint 9c having a nearly circular cross section is welded to the 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'.

In the pipe type joint shown in FIG. 6C, arc-shaped joints 9e, which are almost circular, 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.

Either type of joint can be used, but pipe type joints are becoming popular due to the fact that both joints have no distinction between male and female, and that they have good waterproofness.

In the work shown in FIG. 4 (A), when a large number of sheet piles 8 are sequentially driven, the joints 9 must be engaged and driven.
The top must project above the water surface 6 as shown in FIG.

If the top is sunk below the surface of the water, the joint 9 cannot be engaged even if the next sheet pile is also driven.

However, depending on the specifications of the underwater structure or the working conditions, the top of the steel pipe sheet pile 8'may need to be lower than the water surface 6 by the depth D 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 in water along the line cc 'shown in the figure. .

The work involving the above-mentioned underwater cutting consumes a great deal of time and labor, and results in cutting off the upper portion of the steel pipe pile, which is not preferable in terms of resource economy.

Therefore, in the prior art, it is desired to perform the underwater driving of the sheet pile by using the yatco that was used for pile driving independently.

FIG. 6 is an explanatory view showing a method of arranging steel pipe sheet piles using a Yatco and driving them below the water surface.

This construction method relates to an unknown invention created by the present inventors.

FIG. 6A shows a state in which a large number of steel pipe sheet piles 8, 8 ′, 8 ″, 8 a, ... Are being driven in sequence on the water bottom 5 below the water surface 6.

Steel pipe piles 8,8 ', 8 "have been placed.

Steel pipe piles 8a, 8b, 8c have been placed for the time being,
Yatco 7a, 7b, 7c is still attached.

The steel pipe pile 8d to be driven from now on is erected by suspending the top portion thereof from the crane hook 9 via the Yatco 7d.

The connection between the Yatco 7d and the main pile is achieved by temporarily fixing the main pile with a pile keeper or the like and connecting the joint pipes.

(B) As shown in the figure, the vibration device 1 is attached to the head of the Yatco 7d.
Is attached (held by the chuck device 2 described in FIG. 3), and vibration driving is performed as shown in FIG.

In this case, management of piles (meaning including sheet piles) (tilting, tilting, etc.)
Check the falling and tilting of the yatco to improve the pile driving accuracy.

FIG. 6D shows a state in which the steel pipe sheet pile 8d is driven to a predetermined depth.

The steel pipe sheet pile 8d that has been driven to a predetermined depth is left attached with the yatco 7d. In this state, the steel pipe pile 8d is below the surface of the water, and it is not easy to confirm its position.
The yatco 7d is attached to the steel pipe pile 8d with the role of the sign.

(E) As shown in the figure, steel pipe piles that have been temporarily placed
It is detached from 8a and the yatco 7a is lifted up. The yatco 7a suspends the next steel pipe sheet pile 8e as shown in Fig. (F), and the yatco 7d is built as a guide.

Comparing the state of this figure (F) to the above-mentioned figure (A), it is the same except that the names indicating the order of the steel pipe sheet pile and the yatco have changed. In this way, the process of one cycle is advanced, and one steel pipe sheet pile is driven in every cycle.

However, if an unknown invention method described with reference to FIGS. 6 (A) to 6 (F) is to be carried out, the construction is difficult with the conventional example of Yatco (FIG. 3) for the following reason.

That is, in each step of the construction method described in FIG. 6, the working yatco is directly suspended by the crane hook 9 in FIGS. (A), (E), and (F).
In FIGS. (B), (C), and (D), the vibration device 1 is attached.

Therefore, in the case of a yatco having a structure in which it is fastened to the vibrating device 1 with the bolts and nuts through the flange joint 3 ', like the conventional yatco 7 shown in FIG. It wastes a great deal of time and labor and is uneconomical.

In view of the above-mentioned circumstances, in order to construct a YATCO suitable for carrying out the unknown invention method shown in FIG. 6, one end in the longitudinal direction (lower end in use) for piles (including sheet pile) is used. And the other end (upper end when in use) can be gripped by the chuck of the vibration device, and the side face of the pile plate corresponding to the sheet pile joint provided on the pile. It is effective to provide a joint for use.

The YATCO according to the above configuration is an invention (hereinafter, referred to as the first prior invention) created by the present inventors and being separately applied by the present applicant (filed on June 6, 1990).

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

Therefore, the vibrating device can be detached from the yatco, the yatco can be left for a while, and another yatco can be gripped by the vibrating device.

Further, if the yatco is used to grip the sheet pile and the vibrating device is attached to the yatco, it is possible to lift the yatco through the vibrating device and also to lift the pile gripped by the chuck of the yatco together. .

In this way, it is possible to carry out 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. 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 11b for the steel pipe sheet pile 8 at the lower end of the main body pile 11a.

The upper end portion 11c of the yatco 11 is a grip portion that can be gripped by the chuck device 2 mounted on the vibrating device 1.

When this structure is compared with the conventional example (Fig. 3) to make sure, the yatco 7 of the conventional example has the pile chuck device 2 at the lower end thereof.
Is attached, but the upper end thereof has a structure that cannot be gripped by the chuck device 2 of the vibration device 1.

On the other hand, the yatco 11 of the present example can grip and release the steel pipe sheet pile 8 by the chuck 11b at the lower end thereof, and the upper end thereof can be gripped by the chuck device 2 of the vibration device 1. It has a structure that can be released.

Further, the yatco 11 is provided with a sheet pile joint 11d on its side surface in the longitudinal direction.

The type of the sheet pile joint 11d is, for example, as shown in FIG.
Any of the various sheet pile joints shown in (C) may be used, but as shown in FIGS. 7 (A) and 7 (B), the steel pipe sheet pile 8 provided on the steel pipe sheet pile 8 held by the chuck 11b is shown. The same type as the joint 9, and the steel pipe sheet pile joint 9
It is configured to be aligned on the same straight line as.

In FIG. 7 (A), which is a side view, the width dimension W ₁ of the chuck 11b and the width dimension W 2 of the chuck device ₂ are larger than the rectangular dimension d ₁ of the steel pipe sheet pile 8 and are projected outward. In FIG. 7 (B) which is a front view, the steel pipe sheet pile 8 is
The thickness dimension T ₁ of the chuck 11b and the thickness dimension T 2 of the chuck device ₂ are smaller than the diameter dimension d ₁ thereof, and they do not project laterally.

As described above, in the front view (FIG. 7 (B)), the steel pipe sheet pile joint 9 of the steel pipe sheet pile 8 and the sheet pile joint 11d of the Yatco 11 are shown.
And are arranged in a straight line.

Therefore, the width dimension T ₁ of the chuck 11b of this Yatco 11 is
It is smaller than the diameter dimension d ₂ of the main body rod 11a of the yatco 11 and does not project laterally.

In this way, the chuck 11b of the yatco 11 does not project to the side in comparison with the main rod 11a in the front view, when each of the plurality of steel pipe sheet piles 8 is gripped by the yatco 11 and arranged in a row, Any Yatco 11 chuck 11b
However, it is set so that it does not interfere with the adjacent yatco and does not interfere with the steel pipe sheet pile gripped by the adjacent yatco.

As can be easily understood by comparing and contrasting FIGS. 7A and 7B, the chuck 11b of the Yatco 11 holds the steel pipe sheet pile 8 in the diametrical direction. Specifically, the steel pipe sheet pile joint 9 is clamped in a direction orthogonal to the direction in which the steel pipe sheet pile joint 9 is arranged (the direction perpendicular to the paper surface in FIG. 7 (A), the left-right direction in FIG. 7 (B)), so-called two-point support. It will be gripped in the form of.

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

FIG. 8 is a process explanatory view of this use example.

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

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

8a, 8b, 8c are steel pipe sheet piles that have been punched in this order and have not yet undergone post-treatment (removal of Yatco).

Reference numeral 11 denotes the yatco described with reference to FIG. 7. In this example of use, four yatco 11A, 11B, 11C, 11D were used in sequence.

The yatco 11A has not yet been removed while holding the steel pipe sheet pile 8a and driving the steel pipe sheet pile 8a.

The yatco 11B has not yet been removed while holding the steel pipe sheet pile 8b and driving the steel pipe sheet pile 8b.

The yatco 11C has not yet been removed while holding the steel pipe sheet pile 8c and driving the steel pipe sheet pile 8c.

The steel pipe sheet piles 8d to be placed side by side on the steel pipe sheet pile 8c are held by the chuck 11b of the yatco 11D, and the grip portion 11c of the yatco 11D is held by the chuck device 2 of the vibrating device 1.

The vibration device 1 described above is mounted on a crane 9'through a rod swing suspension 10.
It is suspended by the pulley (only a part of the pulley and the wire rope is shown), and the top of the yatco 11C protruding above the water surface 6 is hung down as a target, and the steel pipe sheet pile 8d is attached to the sheet pile joint 11d of the yatco 11C. The joint 9 is engaged, and the steel pipe sheet pile joint 9 is hung while sliding along the sheet pile joint 11d.

With the Yatco 11C gripping the steel pipe sheet pile 8c, the sheet pipe joint 11d of the Yatco 11C and the steel pipe sheet pile joint 9 of the steel pipe sheet pile 8c.
Since the and are aligned in a straight line, the suspended steel pipe sheet pile
The steel pipe sheet pile joint 9 of 8d is slidably engaged with the steel pipe sheet pile joint 9 of the steel pipe sheet pile 8c from the sheet pile joint 11d of the Yatco 11C, as shown in FIG. 8 (B).

Furthermore, the yatco 11D and the steel pipe sheet pile 8d gripped by the yatco 11D are suspended, and the lower end of the steel pipe sheet pile 8d is attached to the water bottom 5 '.
(See FIG. 8 (C)), and the vibrating device 1 is operated to perform the vibration placing work.

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

At this time, as described with reference to FIG. 7, the steel pipe sheet pile 8d
The thickness dimension of the chuck 11b of the Yatco 11D gripping the (horizontal dimension in FIG. 8) does not extend laterally from the body rod 11a of the Yatco 11D.
Work will proceed smoothly without interfering with 1C and steel pipe sheet pile 8c.

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

As shown in FIG. 8 (F), the above-mentioned chuck device 2 grips the yatco 11A, and the chuck 11b of the yatco 11A is gripped.
Release the grip of the steel pipe sheet pile 8a by the
Lift A by crane 9 '.

Yatco 11A chuck 11b lifted as above
As a result, as shown in FIG. 8 (G), a new steel pipe sheet pile 8e is grasped and lifted, and the yatco 11 protruding above the water surface 6
The top of D is hung down as a target.

Steel pipe sheet pile 8e steel pipe sheet pile joint 9 is Yatco 11D sheet pile joint 1
It is engaged with 1d, guided by the sheet pile joint 11d, slides down, 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.

Considering this FIG. 8 (G) in comparison with the above-mentioned FIG. 8 (B), the steel pipe sheet pile 8d to be placed in FIG. 8 (B) has already been placed in FIG. In the figure (G), a steel pipe sheet pile 8e to be placed next to (in parallel with) the steel pipe sheet pile 8d is about to be placed.

And in Fig. (B), it was used and not collected 3
Of the Yatco 11A, 11B, 11C in the book, the Yatco 11A that was the earliest used is being used again, (B)
The Yatco 11D that was in use in the figure is used and uncollected in the figure (G).

That is, the state shown in FIG. 8 (G) is a state in which the process of one cycle has advanced compared to the state shown in FIG. 8 (B).

In this manner, the four Yatco 11A, 11B, 11C, 11D are sequentially collected and reused, and again collected and reused, and a large number of steel pipe sheet piles 8e to 8e are placed side by side on the water bottom 5 '.

In this usage example, four Yatco were used in sequence,
In the case of using the yatco of the present invention, at least two are used alternately in sequence, and one yatco is always mounted on the already-cast steel pipe sheet pile, and the top thereof is projected above the water surface 6, The steel pipe sheet pile joint 9 of the steel pipe sheet pile 8 in the next step can be positioned and guided by the protruding Yatco sheet pile joint 11d.

However, as in the use example shown in FIGS. 8 (A) to (G), using four YATCOs 11A to 11D, always use three or more YATCOs that have not been used yet and have already collected them on the existing sheet pile. When attached to the left side and left undisturbed, the three or more Yatco companions will be attached to the sheet pile joint 11
Since they are connected through d and are supported by each other, the resistance against waves is large and stable.

When driving a pile (meaning including sheet pile) using a vibration device,
A technique of suspending the vibrating device via a vibration-proof suspension is known. If this known technique is applied, the suspension force can be reduced (or reduced to zero) from the state in which the vibration device is suspended by the crane through the vibration-proof suspension device, and the vibration device can be operated to perform vibration driving. .

Therefore, in the state of FIG. 8C, the vibration driving can be performed while the crane 9 ′ and the vibration device 1 are connected to each other via the vibration-proof suspension device 10. As shown in FIG. 8 (F), the grip of the chuck device 2 of the vibration device 1 is released.
Like the above, the chuck device 2 can be changed to the Yatco 11A. The relationship between such an operation being possible and the configuration shown in FIG. 7 will be described below with reference to FIGS. 8 and 6.

FIGS. 6 (A) to 6 (F) schematically show the idea of an unknown invention method relating to the creation by the present inventor.
The equipment for doing this has been unfinished to date.

FIGS. 8 (A) to 8 (G) schematically depict the actual process at the stage when the idea of the above-mentioned invention method can be implemented by using the Yatco for water bottom pile construction according to the invention of the first prior application. However, there is a slight difference between FIGS. 8 and 6 as described below.

In FIG. 6 (A), which shows the idea, the crane 9 directly suspends the yatco 7d, and FIG.
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. Then, in FIG. 6 (E), the crane 9 is used to leave the vibrating device 1 on the top of the yatco 7d.
Lifting 7a.

On the other hand, the seventh embodiment of the invention of the first prior application
In the configuration shown in the figure, the antivibration hanger 10 hung by the crane 9'and the vibration device 1 hung by the antivibration hanger 10 are firmly connected and cannot be easily attached and detached.

Then, the yatco 11 is adapted so that it can be gripped by fitting it to the chuck device 2 which is generally configured to grip a steel pipe pile (including a sheet pile).
A grip portion 11c is provided on the top of the.

In FIGS. 8 (C) and 8 (D) showing a construction method in which the Yatco 11 of this example is actually used, by the vibration device 1 which is still connected to the crane 9 ′ via the vibration-proof suspension device 10, The steel pipe sheet pile 8d is vibrated by gripping the yatco 11D via the chuck device 2. In FIG.
The gripping is released, the chuck device 2 is used to change to the Yatco 11A, and the Yatco 11A is lifted, as shown in FIG.

When the new steel pipe sheet pile 8e is grasped and hung down at a predetermined position by the suspended yatco 11A (FIG. 8 (G)), the steel pipe sheet pile 8e is ready for vibration driving through the yatco 11A.

As described above, in FIG. 6 (which shows an idea), the holding member is changed by the crane 9 in FIG. 8 (practical process), and the holding device is changed by the chuck device 2 in the same manner. The effect is achieved.

The main reason for making such a usage possible and providing such an action and effect (see FIG. 7) is that the steel pipe sheet pile 8 can be detachably held by the chuck 11b provided at the lower end of the Yatco 11. This is due to the structure and the structure in which the top of the yatco 11 can be detachably held by the chuck device 2 of the vibration device.

The reason why a large number of steel pipe sheet piles can be arranged and easily placed in the correct position is that the side wall of the yatco 11 is provided with a sheet pile joint 11d corresponding to the steel pipe sheet pile joint 9 of the steel pipe sheet pile 8.

As explained above, according to the Yatco for water-bottom pile driving work according to the invention of the first prior application, a large number of steel pipe sheet piles are arranged and driven to the water bottom, and the tops of the plurality of steel pipe sheet piles are driven below the water surface. It was confirmed that the steel pipe sheet pile to be driven can be positioned quickly, easily and with high accuracy.

The inventors of the present invention have further conducted a practical test study on the Yatco for water-bottom pile construction according to the invention of the above-mentioned prior application, and as a result, have discovered that further improvement is desired as described below.

Seventh Embodiment showing one embodiment of Yatco according to the invention of the prior application
The IX-IX cross section of FIG. 9B is as shown in FIG. 9A.

That is, when a plurality of steel pipe sheet piles 8 are arranged in a row in the X-axis direction, the chuck 11b (provided at the lower end of the Yatco 11) according to the invention of the prior application is opposed in the Y-axis and Y'-axis directions. Be positioned.

(This FIG. 9 is a schematic explanatory view and shows a steel pipe sheet pile joint 9
Is omitted).

Therefore, when a wave in the oblique direction collides with the yatco fixed by the chuck 11b on the steel pipe sheet pile 8, the yatco is tilted.

In order to withstand the force of such waves, it is conceivable to dispose two pairs of chucks 11b orthogonal to each other as shown in FIG. 9 (B). Then, chucks 11b cannot interfere with each other because they interfere with each other as shown by the spots.

Further, as shown in FIG. 9 (C), it is conceivable to radially install three chucks 11b for one yatco. However, according to this plan, the direction of the YATCO has to be considered when the YATCO is used in sequence, so that the construction management becomes extremely complicated.

Moreover, it is not easy to avoid the interference at the portions indicated by the reference symbol K because there is too little margin in terms of design and construction.

In view of the above-mentioned circumstances, further improvement is made without impeding the effect of the yatco of the invention of the first prior application. I. There is no risk of the yatco falling down even if it receives waves in the oblique direction, ii. There is no possibility that the chucks of the Yatco fixed to each of the steel pipe sheet piles interfere with each other, and iii. When using the Yatco, there is no particular restriction on the direction of the Yatco, and a configuration for providing the Yatco for water-bottom pile construction. As a result, a pile chuck device is provided at one end in the longitudinal direction, the other end can be gripped by the chuck of the vibration device, and a joint for sheet piles is provided in the longitudinal direction along the side surface. It is a yatco for water bottom pile driving work provided, wherein at one end where the pile chuck device is provided, an expandable supporter that is inserted into the pile and expanded is provided, and the supporter is Expansion Then, the structure in which it is crimped to the inner surface of the pile and the Yatco and the pile are fixed to each other is effective. The above-mentioned structure is an invention created by the present inventors and separately applied by the present applicant (hereinafter referred to as a second prior application).

The YATCO provided with the supporter having the above-described configuration is fixed to the steel pipe pile by pressing the steel pipe pile to the inside instead of gripping the steel pipe pile from the outside. Therefore, there is no possibility that the supporters will interfere with each other between adjacent yatcoes.

Since the yatco is fixed to the steel pipe pile (including the sheet pile) as described above, there is no risk of the yatco falling down even if it receives waves from any direction.

Further, by eliminating the gap between the steel pipe pile and the gripping device portion, damage to the steel pipe pile can be prevented, and the stress due to the wave force applied to the yatco can be dispersed, so that a strong yatco support is provided.

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

This embodiment is obtained 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. 7 and improving the invention of the second prior application. The related FIG. 10 is a side view corresponding to FIG. 7 (B) according to the invention of the first prior application.

In FIG. 10, those denoted by the same reference numerals as those in FIG. 7 (B) are the same or similar components as in the invention of the first prior application.

The difference of this embodiment (FIG. 10) from the embodiment according to the first prior application of FIG. 7 (B) is that the expandable supporter 21 is provided at the lower end of the yatco 11.

For example, brakes for vehicles include an external contraction type and an internal expansion type, which are publicly known. The expandable supporter according to the invention of the second prior application has a structure similar to that of the internal expandable brake, and is inserted into the steel pipe sheet pile 8.
When expanded, it is strongly crimped to the inner peripheral surface of the steel pipe sheet pile.

The expandable supporter 21 of this example has two pairs of expansion levers 21a and 21b.
Is provided. The enlarged details of this part are shown in FIG.

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

11b is a chuck similar to that of the invention of the first prior application, and has a configuration capable of gripping and lifting the steel pipe sheet pile 8.

At the upper end of the steel pipe sheet pile 8, a plate 8p for guiding and reinforcing is provided along the surface including the center line thereof.

Reference numeral 22 denotes a pair of guides fixed to the lower end of the main rod 11a of the yatco 11 and is a member for guiding the yatco 11 concentrically with the steel pipe sheet pile 8.

As shown in FIG. 11 (A), a pair of expansion levers 21a, 21b
However, it is supported by a shaft 21c so as to be tiltable with respect to the lower end of the Yatco body rod 11a.

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

The cylinder 21d is expanded and contracted by being supplied with hydraulic pressure via a hydraulic hose and an operation valve (both not shown), and the expansion levers 21a and 21b are expanded and contracted as indicated by reciprocating arc arrows 21a 'and 21b'. Let

When the expansion levers 21a and 21b are contracted and inserted into the steel pipe sheet pile 8 to be expanded, the yatco 11 and the steel pipe sheet pile 8 are supported so as to be concentric.

Here, the chuck 11b is locally crimped to the steel pipe sheet pile 8 and has a function of suspending the weight thereof, whereas the expansion levers 21a and 21b are provided on the inner surface of the steel pipe sheet pile 8. On the other hand, since it has a comparatively long contact length Lc, it has an excellent function of holding the attitude of the Yatco 11 with the steel pipe sheet pile 8 as a reference.

Specifically, it is as follows. That is, in the state where the steel pipe sheet pile 8 is driven and fixed to the submarine ground, the expandable supporter 21 supports the yatco 11 concentrically with the steel pipe sheet pile 8 and functions to prevent misalignment.

Therefore, even if the force of the waves is received, Yatco is supported so as not to fall.

As can be easily understood from FIG. 10, the underwater pile driving construction yatco 11 of this example is the extended supporter in the embodiment (FIG. 7) of the underwater pile driving construction yatco according to the invention of the first prior application. Because of the structure in which the above are added together, the peculiar effect in the invention of the first prior application, that is, "a large number of steel pipe sheet piles are arranged side by side and driven to the bottom of the water, and the tops thereof are driven below the water surface, and the positioning of the steel pipe sheet piles is easy. It has all the advantages of "being".

[Problems to be Solved by the Invention]

The present inventors can arrange a large number of steel pipe sheet piles for the Yatco for water bottom pile driving work according to the second prior application, and can place them so that their tops are below the water surface. It is possible to perform quick and easy positioning with high accuracy, and there is no possibility of tipping the yatco no matter which direction the wave force is applied to the yatco. As a result of further confirmation, further practical testing studies revealed room for improvement as described below.

That is, for example, as shown in FIG. 12, a steel pipe sheet pile 8 is driven on the water bottom ground 5 ', a Yatco 11 is attached on it, and the top portion thereof is projected above the water surface 6 for a considerably long time (for example, several days). (Or more) In some cases, it must be left alone.

Of course, the work is suspended at night and on holidays, but it may be suspended for several days due to coordination with other related works.

As shown in FIG. 12, while holding the steel pipe sheet pile 8 by the chuck 11b, the expansion levers 21a, 21b of the expansion supporter 21 are grasped.
If left in the expanded state for a long time, the chuck
It cannot be said that the pressure oil of the hydraulic cylinder of 11b and the hydraulic cylinders of the expansion levers 21a and 21b leak and cause a pressure drop.

In this way, if the sea becomes rough in the state where the holding force of the cylinder is reduced due to the oil leakage, the yatco 11 will fall due to the force of the waves.

When the sea is rough like this, the work boat cannot approach, so it is not possible to check the hydraulic pressure holding state or replenish pressure oil.

The present invention has been made in view of the above circumstances, and automatically replenishes pressure oil when the holding hydraulic pressure of the hydraulic cylinder for the chuck or the hydraulic cylinder for the extended supporter provided on the Yatco decreases. It is an object of the present invention to provide an emergency hydraulic unit that is capable of operating and does not require external energy supply during operation.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a hydraulic cylinder of a pile chuck device provided on a Yatco and a hydraulic cylinder of an internal expansion type supporter provided on the Yatco. A hydraulic pump connected to at least one of the above, a power source for rotationally driving the hydraulic pump, and a means for storing energy to be supplied to the power source.

When carrying out the present invention, it is convenient to provide a pressure sensitive switch that detects and operates the holding pressure oil in the hydraulic cylinder, and is configured to operate the power source when the holding hydraulic pressure decreases. Is.

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 (it is convenient to replenish compressed air from a work boat when the sea is not rough).

In the present invention, the air pump is not a pneumatic pump in a narrow sense, but a pump that is driven by pressure gas to discharge high-pressure oil.

If a DC motor is used as the power source and a storage battery or a fuel cell is used as the energy storage means,
The output control of the power source is easy.

Advantageously, the hydraulic pump, power source and energy storage means together with these accessories are mounted on a float or housed in a waterproof case and attached to the top of the Yatco.

[Action]

According to the above configuration, since the hydraulic pump, the power source for the hydraulic pump, and the energy storage means are provided in the emergency hydraulic unit, it is necessary to receive energy supply from the outside (for example, power supply by the power transmission line). Instead, the power source can be operated to rotate the hydraulic pump, and the holding hydraulic pressure can be replenished to the hydraulic cylinder of the chuck device or the hydraulic cylinder of the extended supporter.

〔Example〕

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

The chuck cylinder 11b _-1 shown in the upper right of the figure is a hydraulic cylinder for operating the chuck 11b of the Yatco 11 in the second prior application shown in FIG.

The supporter cylinder 21d is a hydraulic cylinder for expanding the expansion supporter 21 shown in FIG.

The above hydraulic cylinders 11b- ₁ and 21d are connected to the regular hydraulic unit 32 via a coupler 31a during normal operation.

The regular hydraulic unit 32 is mounted on a work boat (not shown) and is driven by a drive motor 32a.
The discharge pressure oil is discharged through the operation valve V to the cylinder 11b.
_-1, and supplies to 21d.

32c is a hydraulic oil tank.

The cylinders 11b- ₁ and 21d are also detachably connected to the emergency hydraulic unit 33 via the coupler 31a and the hydraulic hose 31b.

The emergency hydraulic unit 33 includes a high pressure gas tank 33a.

The high-pressure gas tank 33a of this example is a nitrogen gas cylinder (capacity 3.4 l) equipped with a pressure reducing valve 33a- ₁ of 5 kg / cm ² . In practicing the present invention, this high pressure gas tank 33a 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 spare 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 l / min at a discharge pressure of 210 kg / cm ² .

When the steel pipe sheet pile placing work is stopped and the normal hydraulic unit 32 mounted on the work boat is separated from the chuck cylinder 11b _-1 and the supporter cylinder 21d, the discharge ports of the air pumps 33e and 33f of the emergency hydraulic unit 33. The coupler 31
a, connected to the hydraulic cylinders 11b- ₁ and 21d via a hydraulic hose 31b.

When the pressure in the pipeline becomes less than 210 kg / cm ² , the gas in the high-pressure gas tank 33a (reduced in pressure to 5 kg / cm ² ) is supplied to the air pump 33e, and the air pump 33e is operated.

33i is a hydraulic oil tank.

The pressure oil discharged from the air pump 33e is supplied to the cylinders 11b- ₁ and 21d while being regulated by the pressure regulating valve 33h.

The air pump 33f is a spare air pump provided as a spare of the air pump 33e.

Now, it is assumed that the hydraulic pressure is not recovered due to some failure and the pressure is gradually reduced. In this case, when the pressure is 170 kg / cm ² or less, the solenoid valve 33b is operated to the (b) position and the auxiliary air pump 33f is operated.

The components of the emergency hydraulic unit described above with reference to FIG. 1 are housed in a case, mounted on a float 34, and anchored via a hydraulic hose 31b, as shown in FIG. 2 (A). Keep it.

As a result, even if the steel pipe sheet pile 8 is left standing for a long time with the yatco 11 attached, the hydraulic cylinder of the chuck device 11b or the hydraulic cylinder of the extended supporter (see FIG. 2A of the present application).
The holding hydraulic pressure is always maintained at 210kg / cm ² or more (170kg / cm ² or more even if there is a failure).
Since the yatco 11 is firmly fixed to the steel pipe sheet pile 8, there is no risk that the yatco 11 will fall due to waves.

FIG. 2B shows an embodiment different from FIG.

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

〔The invention's effect〕

As described above, when the emergency unit according to the present invention is applied to the yatco equipped with the pile chuck device and the extended supporter, the yatco is attached to the steel pipe pile (including the sheet pile) and left for a long time. However, since the holding hydraulic pressure of the hydraulic cylinder of the chuck device and the hydraulic cylinder of the expanded supporter does not decrease, it has the excellent practical effect that the Yatco will not be overwhelmed by the waves and contributes to the advancement of water bottom pile driving technology. It's a lot.

[Brief description of drawings]

FIG. 1 is an air / hydraulic system diagram showing an embodiment of an emergency hydraulic unit according to the present invention. 2 (A) and 2 (B) are external perspective views showing the usage state of the above embodiment. FIG. 3 is an explanatory view of a conventional pile driving method, in which (A) shows land driving and (B) shows water bottom driving. 4 (A) and 4 (B) are explanatory views of problems in the water bottom pile driving method in the conventional technique. FIG. 5 is an explanatory view of a steel pipe sheet pile joint, where (A) shows a two-port joint, (B) shows a T joint, and (C) shows a pipe joint. 6 (A) to 6 (F) are explanatory views of an unknown water bottom pile driving method. FIG. 7 is an explanatory diagram of an embodiment of the invention according to the first prior application. 8 (A) to 8 (G) are explanatory views of a method of using the embodiment according to the invention of the first prior application. FIG. 9 is an explanatory diagram of a problem in the invention according to the first prior application. FIG. 10 is a side view showing a yatco according to the invention of the second prior application, FIG. 11 (A) is an enlarged detailed view of the XI portion thereof, and FIG. 11 (B).
FIG. 4 is a sectional view taken along line BB. FIG. 12 is an explanatory diagram of a problem in the Yatco according 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' ... Underwater ground, 6 ... Water surface, 7 ... Conventional example Yatco, 8 …… Steel pipe sheet pile, 9 …… Steel pipe sheet pile joint, 10 …… Vibration-proof suspension, 11 …… Yatco of the embodiment, 11a …… Main body rod, 11b …… Chuck, 11
c …… grip, 11d …… sheet pile joint, 21 …… expansion type supporter, 21a, 21b …… expansion lever, 21c …… axis, 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, 33e …… Air pump, 33f …… Spare air pump, 33g …… Pressure sensitive switch, 33h …… Pressure regulating valve, 33i …… Operating oil tank, 34 …… Float.

Claims (6)

[Claims] 1. A hydraulic pump connected to at least one of a hydraulic cylinder of a pile chuck device provided on the Yatco, and a hydraulic cylinder of an internally expandable supporter provided on the Yatco, and An emergency hydraulic unit for a yatco, comprising: a power source for rotationally driving a hydraulic pump; and means for storing energy supplied to the power source. 2. The hydraulic cylinder comprises a pressure sensitive switch, and when the pressure sensitive switch becomes a predetermined pressure or less.
The emergency hydraulic unit for a yatco according to claim 1, wherein the emergency hydraulic unit has a structure for turning on a power source of the hydraulic pump. 3. The emergency oil pressure system for a yatco according to claim 1, wherein the power source is an air pump driven by a pressure gas, and the energy storage means is a high pressure gas cylinder. unit. 4. The emergency hydraulic unit for a 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 hydraulic pump, the power source, and the energy storage means, together with the accessory members of these devices, are mounted on a float together, and are equipped with a high-pressure oil hose for connecting to the Yatco. An emergency hydraulic unit for a Yatco according to claim 1, characterized in that. 6. The structure in which the hydraulic pump, power source, and energy storage means are put together in a waterproof case together with accessory members of these devices, and can be attached near the top of the Yatco. An emergency hydraulic unit for a Yatco according to claim 1.