GB2448613A

GB2448613A - steel-sheet-pile press-in and extraction machine

Info

Publication number: GB2448613A
Application number: GB0807089A
Authority: GB
Inventors: Keiichi Nakamura
Original assignee: KOWAN CO Ltd
Current assignee: KOWAN CO Ltd
Priority date: 2007-04-20
Filing date: 2008-04-18
Publication date: 2008-10-22
Anticipated expiration: 2028-04-18
Also published as: GB2448613B; JP4764851B2; JP2008267015A; GB0807089D0

Abstract

A general-purpose steel-sheet-pile press-in and extraction machine is capable of handling a steel sheet pile having an arbitrary joint pitch and both a U-steel sheet pile and a Z-steel sheet pile. This steel-sheet pile press-in and extraction machine includes: a plurality of clamping devices 3 each of which clamps an already-disposed steel sheet pile by allowing a clamp cylinder to stretch a movable clamp claw (fig.3, 13) toward a fixed clamp claw (fig.3, 12), with a clamp claw (fig.3, 25) made up of the fixed clamp claw 12 and the movable clamp claw 13 straddling an upper-end part of the steel sheet pile; a chucking machine 10 which chucks the steel sheet pile to be pressed in and extracted by allowing a chuck cylinder (fig.14, 54) to stretch a movable chuck claw (fig.14, 53) toward a fixed chuck claw (fig.14, 52), with the steel sheet pile inserted through between the fixed chuck claw 52 and the movable chuck claw 53; and a press-in and extraction cylinder 9 for pressing in and extracting the chucked steel sheet pile, in which the position of the clamp claw 25 of each clamping device 3 is adjustable both along and perpendicular to the already disposed steel sheet piles.

Description

Steel-sheet-pile Press-in and Extraction Machine

Technical Field

The present invention relates to a general-purpose steel-sheet-pile press-in and extraction machine which is capable of handling a steel sheet pile having an arbitrary loint pitch and both a U-steel sheet piles and a Z-steel sheet pile.

Background Art

In recent years, static-load-type steel-sheet-pile press-in and extraction machines producing less vibration and noise have been employed for pressing in and extracting steel sheet piles in various civil-engineering foundation works or the like. Such a static-load-type steel-sheet-pile press-in and extraction machine is provided, as described in Patent Document 1, with a plurality of clamping devices under a base positioned in an already-disposed steel sheet pile.

These clamping devices clamp the steel sheet pile to thereby secure a reaction force. This presses the steel sheet pile chucked by a chucking machine into the ground using a press-in and extraction cylinder.

Various steel sheet piles to be pressed in have . 25 been on the market, and particularly, U-steel sheet piles have been put in wide use in Japan (refer to Non-patent Document 1). As shown in Fig. 32, a U-steel sheet pile 31 has a substantially U-shaped sectional view. It includes: a web 31a; a flange 31b connected to each end * IS* * 30 of the web 31a at a predetermined angle 0; and a joi'nt 31c formed at the free end of each flange 31b. In this U-steel sheet pile 31, the web 31a extends in parallel with a neutral axis Li, and the flange 31b is arranged at a different angle according to the type of the joint pitch and the steel sheet pile. The joints 31c are engaged with each other, and as shown in Fig. 33, the U-steel sheet piles 31 are continuously pressed in to form a steel-sheet-pile wall. After they are pressed in, the joints 31c lie on a neutral axis L2 of the steel-sheet- pile wall. Conventionally, a joint pitch 38 of the U-steel sheet pile 31 is mainly 400 mm, but 500 mm and 600 mm are also adopted. In recent years, U-steel sheet piles having a joint pitch of 700 mm have been provided as well.

Furthermore, Z-steel sheet piles have been used in Japan and become popular in Europe (refer to Patent Document 2 and Non-patent Document 1). As shown in Fig. 34, a Z-steel sheet pile 41 has a substantially Z-shaped sectional view. It includes: a web 41a; a pair of flanges 41b connected to both ends of the web 41a in such a way that they are parallel and opposite to each other; and a joint 41c formed at the free end of each flange 4th. Thereby, the web 41a is placed at a predetermined angle 0 to the flange 41b. In this 2-steel sheet pile 41, the flange 41b extends in parallel with the neutral axis Li, and the web 41a is arranged at a different angle according to the type of the joint pitch and the steel sheet pile. The joints 41c are engaged with each other, and as shown in Fig. 35, the 2-steel sheet piles 41 are continuously pressed in to form a steel-sheet-pile wall. After they are pressed in, the mutually-engaged joints 41c alternate between both * 30 behind and beyond the neutral axis L2 of the steel-sheet-pile wall. Conventionally, a joint pitch 50 of the 2-steel sheet pile 41 is mainly 575 mm, 580 mm, 630 mm and 670 mm. In recent years, Z-steel sheet piles having a joint pitch of 700 mm have also been provided.

When the U-steel sheet pile 31 is pressed in, as shown in Figs. 36 and 38, a plurality of clamping devices 32 provided in a steel-sheet-pile press-in and extraction machine each clamp the web 31a of the already-disposed LI-steel sheet pile 31. Thereby, the steel-sheet- pile press-in and extraction machine is fixed on the already-disposed U-steel sheet piles 31 and a reaction force is secured when pressed in. The flange 31b of the U-steel sheet pile 31 is arranged at a different angle 0 according to the type of the joint pitch and the steel sheet pile. In order for the same clamping devices 32 to clamp them in the same direction, therefore, each needs to clamp the web 31a extending in parallel with the neutral axis Li of the U-steel sheet pile 31.

The clamping device 32 includes a fixed clamp claw 33 and a movable clamp claw 34. It allows a clamp cylinder 35 to stretch the movable clamp claw 34 toward the fixed clamp claw 33. Thereby, it presses and holds the upper-end part of the web 31a of the already-disposed LI-steel sheet pile 31 between the fixed clamp claw 33 and the movable clamp claw 34.

*:*::* When the Z-steel sheet pile 41 is pressed in, as shown in Figs. 39 and 41, a plurality of clamping devices 42 provided in a steel-sheet-pile press-in and extraction machine each clamp the flanges 41b as one of two already-disposed Z-steel sheet piles 41 of which joints 41c are mutually engaged. Thereby, the steel- * 30 sheet-pile press-in and extraction machine is fixed on the already-disposed Z-steel sheet piles 41 and a reaction force is secured when pressed in. The web 41a of the Z-steel sheet pile 41 is arranged at a different angle Qaccordirig to the type of the joint pitch and the steel sheet pile. In order for the same clamping devices 42 to clamp them in the same direction, therefore, each needs to clamp the flanges 41b extending in parallel with the neutral axis Li of the Z-steel sheet pile 41.

The clamping device 42 includes a fixed clamp claw 43 and a movable clamp claw 44. It allows a clamp cylinder 45 to stretch the movable clamp claw 44 toward the fixed clamp claw 43. Thereby, it presses and holds the front-end parts of two adjacent flanges 41b of the already-disposed Z-steel sheet piles 41 between the fixed clamp claw 43 and the movable clamp claw 44. In order to clamp the flanges 41b including the mutually-engaged joints 41c of adjacent Z-steel sheet piles 41, concave portions 46 and 47 are formed in a position where the fixed clamp claw 43 and the movable clamp claw 44 face each other. Thereby, the flanges 41b and the thicker joints 41c protruding from them are clamped in the space formed by these concave portions 46 and 47.

Herein, Patent Document 1 is Japanese Patent Publication No. 63-47848, Patent Document 2 is Japanese Patent Laid-Open Publication No. 2002-294691, and Non-patent Document 1 is JIS, A-5528, Hot-rolled Steel Sheet Pile, Japanese Patent Laid-Open No. 2002-129558.

". 25 As shown in Figs. 36 and 39, clamp pitches 36, *...

37, 48 and 49 are fixed in a conventional steel-sheet-pile press-in and extraction machine. Hence, if a joint pitch 38, 50 of the U-steel sheet pile 31 or the Z-stee].

* sheet pile 41 to be pressed in varies or differs beyond ** SS* a specific range, it cannot clamp a steel sheet pile S..

having such a pitch.

In the case of the U-steel sheet pile 31, as shown in Fig. 36, the steel-sheet-pile press-in and extraction machine whose clamp pitch 36 is 400 mm and clamp pitch 37 is 350 mm can clamp the U-steel sheet pile 31 whose joint pitch 38 is 400 mm. On the other hand, as shown in Fig. 37, if it attempts to clamp the U-steel sheet pile 31 having a wider joint pitch 38 of 500 mm, the fixed clamp claw 33 and the movable clamp claw 34 go out of the range of the web 31a of the U-steel sheet pile 31. This makes it impossible to clamp it. Besides, as shown in Fig. 38, the pressing clamp cylinder 35 itself is the movable clamp claw 34 in the clamping device 32 for the U-steel sheet pile 31. In addition, the fixed clamp claw 33 and the movable clamp claw 34 are formed with no concave portions corresponding to the ones for the joints 41c of the Z- steel sheet piles 41. Thus, it cannot clamp the already-disposed Z-steel sheet piles 41.

In the case of the Z-steel sheet pile 41, as shown in Fig. 39, the steel-sheet-pile press-in and extraction machine whose clamp pitches 48 and 49 are both 660 mm can clamp the Z-steel sheet pile 41 whose joint pitch 50 is 630 nun. On the other hand, as shown in Fig. 40, if it attempts to clamp the Z-steel sheet pile 41 having a different joint pitch 50 of 575 mm, the joint 41c goes out of the range of the concave portions **"** 25 46 and 47 of the fixed clamp claw 43 and the movable *s*.

clamp claw 44. This makes it impossible to clamp it.

Conventionally, if the joint pitch of each of the U-steel sheet pile 31 and the Z-steel sheet pile 41 varies beyond a specific range, a clamping device needs *I S** to be exchanged with one having a size fit for this 0 joint pitch. Otherwise, one and the same steel-sheet- pile press-in and extraction machine cannot clamp the U-steel sheet pile 31 and the Z-steel sheet pile 41.

Furthermore, in terms of a chucking machine for chucking a steel sheet pile to be pressed in, since a clamping device cannot clamp both a ti-steel sheet pile and a Z-steel sheet pile, no chucking machines capable of chucking both steel sheet piles are provided.

Disclosure o the Invention

Therefore, in order to solve the above described problems in a conventional steel-sheet-pile press-in and extraction machine, it is an object of the present invention to provide a general-purpose steel-sheet-pile press-in and extraction machine which is capable of handling a steel sheet pile to be pressed in, whatever joint pitch it may have, and both a U-steel sheet pile and a Z-steel sheet pile.

In order to achieve the above described object, a steel-sheet-pile press-in and extraction machine according to the present invention includes: a plurality of clamping devices each of which clamps an already-disposed steel sheet pile by allowing a clamp cylinder to stretch a movable clamp claw toward a fixed clamp claw, with a clamp claw made up of the fixed clamp claw and the movable clamp claw straddling an upper-end part of the steel sheet pile; a chucking machine which chucks *.** 25 the steel sheet pile to be pressed in and extracted by S...

allowing a chuck cylinder to stretch a movable chuck * .5 :.: . claw toward a fixed chuck claw, with the steel sheet pile inserted through between the fixed chuck claw and the movable chuck claw; and a press-in and extraction e.

cylinder for pressing in and extracting the chucked S..

steel sheet pile, in which the position of the clamp claw of each clamping device is adjustable. Besides, the position of the clamp claw of each clamping device is adjustable without varying the distance between each of the plurality of clamp cylinders.

Furthermore, a-steel-sheet-pile press-in and extraction machine according to the present invention includes: a clamping device having a front clamp, a middle clamp and a rear clamp which clamps an already-disposed steel sheet pile by allowing a clamp cylinder to stretch a movable clamp claw toward a fixed clamp claw, with a clamp claw formed by the fixed clamp claw and the movable clamp claw straddling an upperend part of the steel sheet pile; a chucking machine which chucks the steel sheet pile to be pressed in and extracted by allowing a chuck cylinder to stretch a movable chuck claw toward a fixed chuck claw, with the steel sheet pile inserted through between the fixed chuck claw and the movable chuck claw; and a press-in and extraction cylinder for pressing in and extracting the chucked steel sheet pile, in which: each clamping device slides freely along a rail perpendicularly to the neutral axis of the already-disposed steel sheet pile to be clamped by stretching and shrinking each clamp exchange cylinder of the front clamp, the middle clamp and the rear clamp; the action center line of the clamp cylinder of the front clamp shifts to the side of the chucking machine * *S *** 25 and the action center line of the clamp cylinder of the **.* rear clamp shifts to the side opposite to the chucking machine by a specific distance from the center line of the rail; the clamp pitch between each of the front * clamp, the middle clamp and the rear clamp varies by *. *** exchanging the positions of the front clamp and the rear clamp; and the position of the clamp claw of the clamping device is adjustable.

Moreover, the clamp claw of the clamping device is movable in parallel to the neutral axis of the already-disposed steel sheet pile. Then, the distance between each of the plurality of clamp claws varies by making the clamp claw of the clamping device movable in parallel to the neutral axis of the already-disposed steel sheet pile. Besides, the steel sheet pile having an arbitrary joint pitch is freely pressed in and extracted by varying the distance between each of the plurality of clamp claws.

In addition, only the movable clamp claw is exchangeable by attaching the movable clamp claw to the clamp cylinder via a supporter. Then, a concave portion is formed in a position where the movable clamp claw and the fixed clamp claw face each other, and a Z-steel sheet pile is clamped by surrounding a joint portion of the Z-steel sheet pile with the concave portion.

Besides, the chucking machine has an insertion hole for inserting each of a U-steel sheet pile and a 2-steel sheet pile in a mutually symmetrical position. Further, the chucking machine: allows the fixed chuck claw and the movable chuck claw to face each other in such a way that a web of the steel sheet pile to be pressed in and extracted is inserted through in a middle thereof in plan view; and has an insertion hole for inserting a 25 flange of the steel sheet pile to be pressed in and S...

extracted in a mutually symmetrical position on each side thereof in plan view. Still further, only the movable chuck claw is exchangeable by attaching the movable chuck claw to the chuck cylinder via a *.*...

supporter. S..

The steel-sheet-pile press-in and extraction machine according to the present invention can clamp a steel sheet pile having any joint pitch as an already-disposed piling. Even if a clamping device cannot clamp the already-disposed steel sheet pile as it is because its joint pitch is unfit for it, then without varying the distance between each of a plurality of clamp cylinders, a plurality of clamp claws are moved in the direction parallel to the neutral axis of the already-disposed steel sheet pile to thereby change the distance between each clamp claw. Besides, in a clamping device having a front clamp, a middle clamp and a rear clamp, a steel sheet pile having an arbitrary joint pitch over a wider range can be handled also using a means for varying the clamp pitch between each of the front clamp, the middle clamp and the rear clamp by exchanging the positions of the front clamp and the rear clamp.

Furthermore, a clamp claw has a concave portion surrounding and housing a joint portion of a Z-steel sheet pile. This makes it possible to clamp an already-disposed piling, whichever it may be, a Z-steel sheet pile or a U-steel sheet pile, as already-disposed piling. Moreover, a chucking machine has an insertion hole for inserting each of a U-steel sheet pile and a Z-steel sheet pile in a mutually symmetrical position.

Therefore, the single steel-sheet-pile press-in and extraction machine can press in and extract both a U-* ** *.... 25 steel sheet pile and a Z-steel sheet pile. **I.

Brief Description of the Drawings

Fig. 1 is a side view of a steel-sheet-pile * press-in and extraction machine according to the present invention. *S.

S Fig. 2 is a top plan view of the steel-sheet-pile press-in and extraction machine.

Fig. 3 is a longitudinal sectional view of a main part of a clamping device.

Fig. 4 is a longitudinal sectional view of the main part of the clamping device.

Fig. 5 is a plan sectional view of the main part of the clamping device seen along line A-A of Fig. 3.

Fig. 6 is a plan sectional view of the main part of the clamping device seen along line A-A of Fig. 3.

Fig. 7 is a plan sectional view of the clamping device excluding a clamp claw.

Fig. 8(A) is a front view of a fixed clamp claw, Fig. 8(B) is a right side view thereof, Fig. 8(C) is a rear view thereof and Fig. 8(D) is a cross-sectional view thereof.

Fig. 9(A) is a front view of a movable clamp claw, Fig. 9(B) is a right side view thereof, Fig. 9(C) is a rear view thereof and Fig. 9(D) is a cross-sectional view thereof.

Fig. 10 is a side view of the steel-sheet-pile press-in and extraction machine.

Fig. 11 is a partially-enlarged side sectional view of the clamping device.

Fig. 12 is a plan view of the main part of the clamping device.

Fig. 13 is a plan view of the main part of the * S. s.... 25 clamping device. Sids

Fig. 14 is a plan sectional view of a main part * S. .: * of a chucking machine.

Fig. 15 is a plan sectional view of the main part of the chucking machine.

SS lSS* Fig. 16 is a plan sectional view of the main part S..

of the chucking machine.

Fig. 17 is a plan sectional view of the main part of the chucking machine.

Fig. 18 is a plan sectional view of the main part of the chucking machine.

Fig. 19 is a partial plan sectional view of a self-running auxiliary-roller device.

Fig. 20 is a partial side sectional view of the self-running auxiliary-roller device.

Fig. 21 is a partial sectional view of the self-running auxiliary-roller device.

Fig. 22 is a side view showing how to execute engineering work for a Z-steel sheet pile.

Fig. 23 is a side view showing how to execute engineering work for a U-steel sheet pile.

Fig. 24 is a plan view showing how to conduct a clamping operation.

Fig. 25 is a side view of the steel-sheet-pile press-in and extraction machine.

Fig. 26 is a plan view showing how to conduct the clamping operation.

Fig. 27 is a side view of the steel-sheet-pile press-in and extraction machine.

Fig. 28 is a plan view showing how to conduct the clamping operation.

Fig. 29 is a side view of the steel-sheet-pile press-in and extraction machine. * **

Fig. 30 is a plan view showing how to execute *.d.

engineering work for a U-steel sheet pile. * S.

.: * Fig. 31 is a plan view showing how to execute engineering work for a Z-steel sheet pile.

Fig. 32 is a plan view of a U-steel sheet pile. s Ss

* 30 Fig. 33 is a plan view showing how to execute 5.

* engineering work for the U-steel sheet pile.

Fig. 34 is a plan view of a Z-steel sheet pile.

Fig. 35 is a plan view showing how to execute engineering work for the Z-steel sheet pile.

Fig. 36 is a plan view showing how to clamp a U-steel sheet pile.

Fig. 37 is a plan view showing how to clamp the U-steel sheet pile.

Fig. 38 is a plan sectional view of a conventional clamping device for a U-steel sheet pile.

Fig. 39 is a plan view showing how to clamp a Z-steel sheet pile.

Fig. 40 is a plan view showing how to clamp the Z-steel sheet pile.

Fig. 41 is a plan sectional view of a conventional clamping device for a Z-steel sheet pile.

Best Mode for Implementing the Invention A steel-sheet-pile press-in and extraction machine according to the best embodiment of the present invention will be below described with reference to the drawings. Fig. 1 is a side view of a steel-sheet-pile press-in and extraction machine according to the present invention. Fig. 2 is a top plan view thereof. In this figure, reference numeral 1 denotes a steel-sheet-pile press-in and extraction machine; 2, a base; and 3, a clamping device provided under the base 2 which clamps * , 25 an already-disposed steel sheet pile and positions the steel-sheet-pile press-in and extraction machine 1, as well as secures a reaction force from the already-disposed steel sheet pile. This clamping device 3 is made up of a plurality of clamps. In the figure, it is formed by three clamps: a front clamp 3a, a middle clamp 3b and a rear clamp 3c. In this embodiment, a U-steel sheet pile 31 has the same configuration as shown in Figs. 32 and 33 and a Z-steel sheet pile 41 has the same configuration as shown in Figs. 34 and 35. They are given the same reference characters and numerals, and

their description is omitted.

Reference character F designates a direction in which the steel-sheet-pile press-in and extraction machine 1 moves straight. The base 2 is provided with a slide base 4 sliding freely by a distance equal to the joint pitch of a U-steel sheet pile to be pressed in or longer and double the joint pitch of a Z-steel sheet pile to be pressed in or longer along the straight-moving direction F of the steel-sheet-pile press-in and extraction machine 1. On this slide base 4, a support.

arm 5 is supported so as to turn around a longitudinal axis. A guide frame 7 stands which can turn around a bearing portion 6 placed ahead of the support arm 5.

This guide frame 7 can be tilted on the bearing portion 6 by the stretch and shrink of a tilt cylinder (not shown) supported at an end thereof on the support arm 5.

The guide frame 7 is provided with a rise-and-fall body 8 rising and falling freely. A pair of right and left steel-sheet-pile press-in and extraction cylinders 9 is attached to both sides of the rise-and-fall body 8. One end of each steel-sheet-pile press-in and extraction cylinder 9 is supported by the bearing * *, 25 portion 6 in such a way that the rise-and-fall body 8 :::::: can rise and fall. Reference numeral 10 denotes a chucking machine chucking a sheet pile to be pressed in and extracted. It can slew with respect to the rise-and-fall body 8 below it. These basic configurations are the same as a general static-load steel-sheet-pile press-in and extraction machine.

Next, a configuration of the clamping device 3 of the steel-sheet-pile press-in and extraction machine 1 will be described with reference to Figs. 3 to 13. Fig. 3 is a longitudinal sectional view of the main part around the front clamp 3a or the rear clamp 3c. A clamp exchange cylinder stretches or shrinks to thereby move the clamping device 3 in the width direction (right in the figure) . In the figure, the clamping device 3 includes the three clamps: the front clamp 3a, the middle clamp 3b and the rear clamp 3c, but all of them can have the same configuration.

In the figure, reference numeral 11 designates a clamp exchange cylinder, and one end thereof is fixed to the base 2 and the other end is fixed to the clamping device 3. This clamp exchange cylinder 11 stretches and shrinks to thereby slide the clamping device 3 freely in the directions perpendicular to the neutral axis (see Figs. 33 and 35) of an already-disposed steel sheet pile to be clamped (in the directions parallel to the straight-moving direction F of the steel-sheet-pile press-in and extraction machine 1) along a rail 26 (see Fig. 10) . Fig. 4 is a longitudinal sectional view of the main part of the clamping device 3 which has moved in the opposite width direction (left in the figure) by shrinking the clamp exchange cylinder 11.

Figs. 5 and 6 are each a plan sectional view of * ,, 25 the main part of the clamping device 3 seen along line A-A of Fig. 3. Fig. 7 is a plan sectional view of the clamping device 3 excluding a fixed clamp claw 12 and a : .. movable clamp claw 13. Fig. 8(A) is a front view of the S.. S fixed clamp claw 12; Fig. 8(B), a right side view thereof; Fig. 8(C), a rear view thereof; and Fig. 8(D), *.** . * a cross-sectional view thereof. This fixed clamp claw 12 is fixed detachably to the clamping device 3 by tightening bolts 18a and 18b from bolt holes 19a and 19b of the clamping device 3 toward bolt holes 12b and 12d or 12a and 12c of the fixed clamp claw 12. It can move by a predetermined distance in the directions parallel to the neutral axis (see Figs. 33 and 35) of the alreadydisposed steel sheet pile to be clamped (in the directions parallel to the straight-moving direction F of the steel-sheet-pile press-in and extraction machine 1).

Fig. 5 shows the fixed clamp claw 12 which has moved in the direction opposite to the straight-moving direction F. Without using the bolt hole 12c and the bolt hole 12a protruding outside from the clamping device 3, it is fixed by driving the bolts 18a and 18b into the bolt holes 12b and 12d, respectively. Thereby, the fixed clamp claw 12 is offset by a predetermined distance in the direction opposite to the straight-moving direction F. On the other hand, in Fig. 6, the bolt hole 12d protrudes outside from the clamping device 3. Hence, it is fixed by driving the bolts 18a and 18b into the bolt holes 12a and 12c, respectively. Thereby, the fixed clamp claw 12 is offset by a predetermined distance in the straight-moving direction F. In short, as shown in Figs. 5 and 6, using the bolt holes 12a and 12c or 12b and 12d, the fixed clamp claw 12 is fixed on the clamping device 3. This makes it possible to change its position. S...

Fig. 9(A) is a front view of the movable clamp : .. claw 13; Fig. 9(B), a right side view thereof; Fig. a 9(C), a rear view thereof; and Fig. 9(D), a cross-sectional view thereof. This movable clamp claw 13 is fixed detachably to a movable clamp-claw supporter 14 united and fixed via bolts 21a and 21b to a clamp cylinder 15 attached to the clamping device 3 by screwing bolts 23a and 23b from bolt holes 22a and 22b of the movable clamp-claw supporter 14 to bolt holes 13a and 13b of the movable clamp claw 13. It can move by a predetermined distance in the directions parallel to the neutral axis (see Figs. 33 and 35) of the alreadydisposed steel sheet pile to be clamped (in the directions parallel to the straight-moving direction F of the steel-sheet-pile press-in and extraction machine 1). Fig. 5 shows the movable clamp claw 13 which has moved in the direction opposite to the straight-moving direction F. It is united and fixed via the bolt 23a to the bolt hole 13a of the movable clamp claw 13 and the bolt hole 22a of the movable clamp-claw supporter 14. At the same time, it is united and fixed via the bolt 23b to the bolt hole 13b of the movable clamp claw 13 and the bolt hole 22b of the movable clamp-claw supporter 14. Thereby, the movable clamp claw 13 is offset by a predetermined distance in the direction opposite to the straight-moving direction F (the state of the rear clamp 3c shown in Figs. 10 and 11).

On the other hand, in Fig. 6, the movable clamp claw 13 is inverted back and forth. It is united and fixed via the bolt 23a to the bolt hole 13b of the movable clamp claw 13 and the bolt hole 22a of the movable clamp-claw supporter 14. At the same time, it is * united and fixed via the bolt 23b to the bolt hole l3a I...

of the movable clamp claw 13 and the bolt hole 22b of the movable clamp-claw supporter 14. Thereby, the movable clamp claw 13 is offset by a predetermined distance in the straight-moving direction F (the state of the front clamp 3a shown in Figs. 10 and 11) . Since it is fixed after inverted back and forth, its position can be changed.

A clamp claw 25 is made up of the fixed clamp claw 12 arid the movable clamp claw 13 configured in this way. The clamp claw 25 can move in the directions parallel to the neutral axis (see Figs. 33 and 35) of the already-disposed steel sheet pile to be clamped (in the directions parallel to the straight-moving direction F of the steel-sheet-pile press-in and extraction machine 1). The distance between each of the plurality of clamp claws 25 can be changed without varying the distance between each of the plurality of clamp cylinders 15. Since the distance between each of the plurality of clamp claws 25 is changed, a steel sheet pile having an arbitrary joint pitch as an already-disposed piling can be clamped without exchanging the clamping device 3. Simultaneously, the steel-sheet-pile press-in and extraction machine 1 can be positioned on the already-disposed piling and a reaction force can be obtained from the already-disposed piling.

In addition, the movable clamp claw 13 is attached to the clamp cylinder 15 via the movable clamp-claw supporter 14. Hence, only the movable clamp claw 13 badly worn can be exchanged. Then, concave portions 16 and 17 are formed in a position where the fixed clamp claw 12 and the movable clamp claw 13 face each other, * , 25 respectively. Thus, the Z-steel sheet pile 41 is clamped by surrounding the joints 41c thicker than the flanges 41b and with the concave portions 16 and 17. This makesit possible to clamp the Z-steel sheet piles 41 by uniting the mutually-engaged flanges 4].b and joints 41c.

Incidentally, the front clamp 3a, the middle clamp 3b and the rear clamp 3c may all have the same configuration. If the clamp claw 25 of the front clamp 3a and the clamp claw 25 of the rear clamp 3c are movable, the distance between the middle clamp 3b and each of the front clamp 3a and the rear clamp 3c can be relatively changed. Hence, there is no need to provide the middle clamp 3b with any moving mechanism.

Fig. 10 is a side view of the steel-sheet-pile press-in and extraction machine 1 showing an arrangement and configuration of the clamping device 3. Fig. 11 is a partially-enlarged side sectional view of the clamping device 3. The front clamp 3a, the middle clamp 3b and the rear clamp 3c slide along each rail 26 in the directions perpendicular to the neutral axis (see Figs. 33 and 35) of the already-disposed steel sheet pile to be clamped. They are arranged in such as way that an center line 26a of each rail 26 and an action center line iSa of the clamp cylinder 15 for moving each movable clamp claw 13 shift by a distance d from each other in the directions parallel to the neutral axis (see Figs. 33 and 35) of the already-disposed steel sheet pile to be clamped. Specifically, the action center line 15a of the clamp cylinder 15 of the front clamp 3a shifts by a distance d toward the side of the chucking machine 10 from the center line 26a of each rail 26. on the other hand, the action center line 15a of the clamp cylinder 15 of the rear clamp 3c shifts by a distance d toward the opposite side to the chucking * machine 10 from there. As shown in Fig. 10, the front *** clamp 3a and the rear clamp 3c have an axially-symmetrical shape with respect to a perpendicular line.

Hence, if the positions of the front clamp 3a and the rear clamp 3c are changed, the distances (clamp pitches) between the front clamp 3a and the middle clamp 3b and between the middle clamp 3b and the rear clamp 3c can be varied.

Fig. 12 is a plan view of the main part of the clamping device 3 showing the front clamp 3a and the rear clamp 3c slide leftward and the middle clamp 3b slide rightward with respect to the moving direction F of the steel-sheet-pile press-in and extraction machine 1. In terms of the front clamp 3a and the rear clamp 3c, each clamp exchange cylinder 11 stretches and shrinks in the same direction while it stretches and shrinks in the opposite direction for the middle clamp 3b. The clamping device 3 clamps the web 3].a of the already-disposed U-steel sheet pile 3]. or the flanges 41b including the joints 41c of the two already-disposed Z-steel sheet piles 41. Thus, the front clamp 3a and the rear clamp 3c have a positional relationship in the right-and left directions opposite to the middle clamp 3b. Hence, the stretch-and-shrink directions of the clamp exchange cylinders 11 are also the same, so that they can move easily at a harmonic speed to each position. Therefore, in Fig. 12, the clamp exchange cylinders 11 of the front clamp 3a, the middle clamp 3b and the rear clamp 3c are all kept shrunk.

Fig. 13 is a plan view of the main part of the clamping device 3, conversely to Fig. 12, showing the front clamp 3a and the rear clamp 3c slide rightward and * ,, 25 the middle clamp 3b slide leftward with respect to the moving direction F of the steel-sheet-pile press-in and extraction machine 1. Therefore, the clamp exchange cylinders 11 of the front clamp 3a, the middle clamp 3b and the rear clamp 3c are all kept stretched.

Next, a configuration of the chucking machine 10 ****.

* * of the steel-sheet-pile press-in and extraction machine 1 will be described with reference to Figs. 14 to 18.

Fig. 14 is a plan sectional view of a main part of the chucking machine 10. Reference numeral 51 denotes an insertion hole for inserting both the U-steel sheet pile 31 and the Z-steel sheet piles 41 in a position symmetrical to each other. In a middle thereof in plan view, a fixed chuck claw 52 and a movable chuck claw 53 face each other in such a way that the web 31a of the U-steel sheet pile 31 and the web 41a of the Z-steel sheet pile 41 to be pressed in and extracted can be inserted through. On each side thereof, an insertion hole 51a, 51b is provided for inserting the flange 31b of the U-steel sheet pile 31 and the flange 4].b of the Z-steel sheet pile 41 to be pressed in and extracted in a mutually symmetrical position. Thereby, the insertion hole 51 is shaped in such a way that the insertion holes 51a and 51b having the same shape lead to each other through between the fixed chuck claw 52 and the movable chuck claw 53. Reference numeral 54 designates a chuck cylinder for stretching and shrinking the movable chuck claw 53 toward and from the fixed chuck claw 52.

Thereby, the web 31a of the U-steel sheet pile 31 and the web 41a of the Z-steel sheet pile 41 inserted through between the fixed chuck claw 52 and the movable chuck claw 53 can be pressed and held.

The fixed chuck claw 52 is fixed detachably to * 25 the chucking machine 10 by means of a bolt 56. The movable chuck claw 53 is fixed detachably to a movable * S **** chuck-claw supporter 55 united and fixed via a bolt 57 to the chuck cylinder 54 attached to the chucking machine 10. Hence, only the movable chuck claw 53 badly worn can be exchanged. Then, concave portions 59 and 60 are formed in a position where the fixed chuck claw 52 and the movable chuck claw 53 face each other, respectively. This makes it possible to secure a line for a water-jet tube (not shown).

Figs. 15 and 16 show how the chucking machine 10 chucks the U-steel sheet pile 31. In Fig. 15, the flange 31b lies below while it lies above in Fig. 16. Whichever It may lie, the chucking machine 10 can insert and chuck the U-steel sheet pile 31 in a targeted position. On the other hand, Figs. 17 and 18 show how the chucking machine 10 chucks the Z-steel sheet pile 41. As shown in Figs. 17 and 18, the chucking machine 10 can insert and chuck it in a symmetrical position where each flange 41b is mutually inverted. These configurations help save a turning motion of the chucking machine 10 in inserting and chucking the next U-steel sheet pile 31 or Z-steel sheet pile 41 to be pressed in and extracted through the insertion hole 51. This results in a more efficient press-in and extraction operation.

The steel-sheet-pile press-in and extraction machine 1 is provided, as shown in P1ig. 1, with a self-running auxiliary-roller device 61 in the rear.part of the base 2. Fig. 19 is a partial plan sectional view of the self-running auxiliary-roller device 61; Fig. 20, a partial side sectional view thereof; and Fig. 21 is a partial sectional view thereof from behind. The self- running auxiliary-roller device 61 includes: a self-running auxiliary roller 61a rotating around a shaft * perpendicular to the neutral axis (see Figs. 33 and 35) **** of the already-disposed steel sheet pile to be clamped; and a self-running auxiliary cylinder 61b for raising and lowering the self-running auxiliary roller 61a. The self-running auxiliary cylinder 61b stretches and shrinks so that the self-running auxiliary roller 61a can press, or recede from, the upper-end surfaces of the already-disposed U-steel sheet pile 31 and Z-steel sheet pile 41. This self-running auxiliary roller 61a is used, as described later, for supporting the weight of the steel-sheet-pile press-in and extraction machine 1 and keeping its posture stable when the steel-sheet-pile press-in and extraction machine 1 runs itself on an already-disposed steel sheet pile as it continues to Engineering work executed using the steel-sheet-pile press-in and extraction machine 1 configured as described above will be described with reference to Fig. 22. This work is executed by clamping and positioning the already-disposed Z-steel sheet pile 41, securing a reaction force and pressing in another Z-steel sheet pile. In Fig. 22(A), the engaged joints 41c and flanges 41b of already-disposed Z-steel sheet piles 41e, 41f, 41g and 41h which are pressed in with the joints 41c mutually engaged are each clamped by the front clamp 3a, the middle clamp 3b and the rear clamp 3c. After a first Z-steel sheet pile 41i to be pressed in has been pressed in, a second Z-steel sheet pile 41j to be pressed in by stretching the slide base 4 is chucked and pressed in by the chucking machine 10.

As shown in Fig. 22(A), the second Z-steel sheet pile 41j is pressed in to thereby secure a sufficient supporting force. Thereafter, as shown in Fig. 22(B), * the front clamp 3a, the middle clamp 3b and the rear S...

clamp 3c are released, the rise-and-fall body 8 is raised and the steel-sheet-pile press-in and extraction machine 1 is lifted. This operation is conducted with the self-running auxiliary cylinder 61b of the self-running auxiliary-roller device 61 kept stretched to lower the self-running auxiliary roller 6la and with the upper-end part of the already-disposed Z-steel sheet pile 41e kept pressed. Thereby, the steel-sheet-pile press-in and extraction machine 1 is stably supported by the Z-steel sheet pile 41j which is now pressed in.

Next, from the state of Fig. 22(B), the slide base 4 moves forward, as shown in Fig. 22(C), by the joint pitch of a single already-disposed Z-steel sheet pile 41. Sequentially, from the state of Fig. 22(C), the self-running auxiliary cylinder 61b of the self-running auxiliary-roller device 61 lifts to thereby raise the self-running auxiliary roller 61a. Simultaneously, the rise-and-fall body 8 falls to thereby lower the steel-sheet-pile press-in and extraction machine 1. Then, the engaged joints 41c and flanges 41b of already-disposed Z-steel sheet piles 41f, 41g, 41h, and 41i are each clamped by the front clamp 3a, the middle clamp 3b and the rear clamp 3c. Thereafter, the Z-steel sheet pile 41j is completely pressed in, and the slide base 4 moves ahead by the joint pitch of a single Z-steel sheet pile 41. Then, the next Z-steel sheet pile 41 is chucked and pressed in. Afterward, this operation is repeated one after another, so that it can make a press-in operation while running itself on the already-disposed Z-steel sheet pile 41.

Fig. 23 shows how to execute press-in work for the U-steel sheet pile 31. In Fig. 23(A), among already- * disposed U-steel sheet piles 31e, 31f, 31g and 31h which * *** are pressed in with the joints 31c mutually engaged, each web 31a of the U-steel sheet piles 31f, 31g and 31h * is clamped by the front clamp 3a, the middle clamp 3b and the rear clamp 3c. After a first U-steel sheet pile 31i to be pressed in has been pressed in, a second U-steel sheet pile 31j to be pressed in by stretching the slide base 4 is chucked and pressed in by the chucking machine 10.

As shown in Fig. 23(A), the second U-steel sheet pile 31j is pressed in to thereby secure a sufficient supporting force. Thereafter, as shown in Fig. 23(B), the front clamp 3a, the middle clamp 3b and the rear clamp 3c are released, the rise-and-fall body 8 is raised and the steel-sheet-pile press-in and extraction machine 1 is lifted. This operation is conducted with the self-running auxiliary cylinder 6th of the self-running auxiliary-roller device 61 kept stretched to lower the self-running auxiliary roller 61a and with the upper-end part of the already-disposed U-steel sheet pile 31e kept pressed. Thereby, the steel-sheet-pile press-in and extraction machine 1 is stably supported by the U-steel sheet pile 31j which is now pressed in.

Next, from the state of Fig. 23(B), the slide base 4 moves forward, as shown in Fig. 23(C), by the joint pitch of a single already-disposed U-steel sheet pile 31. Sequentially, from the state of Fig. 23(C), the self-running auxiliary cylinder 61b of the self-running auxiliary-roller device 61 lifts to thereby raise the self-running auxiliary roller 61a. Simultaneously, the rise-and-fall body 8 falls to thereby lower the steel-sheet-pile press-in and extraction machine 1. Then, each web 31a of the already-disposed U-steel sheet piles 31g, * 31h and 311 are clamped by the rear clamp 3c, the middle *.** **** clamp 3b and the front clamp 3a, respectively.

Thereafter, the U-steel sheet pile 31j is completely pressed in, and the slide base 4 moves ahead by the joint pitch of a single U-steel sheet pile 31. Then, the next U-steel sheet pile 41 is chucked and pressed in.

Afterward, this operation is repeated one after another, so that it can make a press-in operation while running itself on the already-disposed U-steel sheet pile 31.

In executing this engineering work, the self-running auxiliary-roller device 61 is used for the following reason. The weight of the steel-sheet-pile press-in and extraction machine 1 is determined substantially by the maximum joint pitch of the Z-steel sheet pile 41 or U-steel sheet pile 31 to be pressed in and extracted. it has a considerable weight. If it runs for itself while chucking the Z-steel sheet pile 41 or the U-steel sheet pile 31 having a minimum joint pitch, it is difficult for the single Z-steel sheet pile 41 or U-steel sheet pile 31 to support the full weight of the steel-sheet-pile press-in and extraction machine 1 because the Z-steel sheet pile 41 or the U-steel sheet pile 31 is not strong enough. Therefore, the self-running auxiliary-roller device 61 presses the upper-end part of the already-disposed Z-steel sheet pile 41 or U- steel sheet pile 31 to thereby support the steel-sheet-pile press-in and extraction machine 1. If it is possible for the Z-steel sheet pile 41 or U-steel sheet pile 31 (the Z-steel sheet pile 411 or U-steel sheet pile 311 in each figure) which is now pressed in to stably support the entire weight of the steel-sheet- pile press-in and extraction machine 1, there is no need to use the self-running auxiliary-roller device 61.

A specific description will be given about how

the clamping device 3 of the steel-sheet-pile press-in and extraction machine 1 according to the present * invention can clamp the U-steel sheet pile 31 or the Z-steel sheet pile 41 having any joint pitch. Fig. 24 is a plan view showing a positional relationship of the ** clamping device 3 capable of handling the U-steel sheet pile 31 or the Z-steel sheet pile 41 having a joint pit.ch of 670 mm, 675 mm or 700 mm. Fig. 25 is a side view of the steel-sheet-pile press-in and extraction machine 1. A clamp pitch 65 (distance between each action center) between each clamp cylinder 15 of the front clamp 3a, the middle clamp 3b and the rear clamp 3c is designed to be 660 nun. The fixed clamp claw 12 and movable clamp claw 13 of the front clamp 3a move forward (toward the side of the chucking machine 10) by 25 mm in parallel to the neutral axis (see Figs. 33 and 35) of the already-disposed U-steel sheet pile 31 or Z-steel sheet pile 41 to be clamped. In the same way, the rear clamp 3c moves backward (opposite to the chucking machine 10) by 25 mm. Thereby, a clamp-claw pitch 66 (distance between the center of each clamp claw 25) between each clamp claw 25 (the fixed clamp claw 12 + the movable clamp claw 13) of the front clamp 3a, the middle clamp 3b and the rear clamp 3c becomes 685 mm.

Hence, as shown in Fig. 25, the movable clamp claw 13 offset forward is viewed from the front clamp 3a while the movable clamp claw 13 offset backward is viewed from the rear clamp 3c.

If the joint pitch of the U-steel sheet pile 31 or Z-steel sheet pile 41 to be clamped are 670 mm, 675 mm or 700 mm, the center part of the clamp claw 25 shifts by a maximum of 15 mm from the joint pitch of the * U-steel sheet pile 31 or Z-steel sheet pile 41. Thus, it is within the range of the web 31a of the U-steel sheet : **** pile 31. In the case of the Z-steel sheet pile 41 *** * * likewise, the joints 41c are housed in the concave *** portions 16 and 17 and it is within the range of the two *:" mutually-engaged flanges 41b. This makes it possible for the same steel-sheet-pile press-in and extraction machine 1 to universally clamp the U-steel sheet pile 31 or Z-steel sheet pile 41 having such a joint pitch.

Simultaneously, if the insertion hole 51 of the chucking machine 10 is designed to have a size for inserting the U-steel sheet pile 31 or Z-steel sheet pile 41 having the joint pitch, a press-in and extraction operation is facilitated.

Fig. 26 is a plan view showing a positional relationship of the clamping device 3 capable of handling the U-steel sheet pile 31 or the Z-steel sheet pile 41 having a joint pitch of 630 irim. Fig. 27 is a side view of the steel-sheet-pile press-in and extraction machine 1. The clamp pitch 65 (distance between each action center) between each clamp cylinder of the front clamp 3a, the middle clamp 3b and the rear clamp 3c is designed to be 660 mm. The fixed clamp claw 12 and movable clamp claw 13 of the front clamp 3a move backward (opposite to the chucking machine 10) by mm in parallel to the neutral axis (see Figs. 33 and 35) of the already-disposed U-steel sheet pile 31 or Z-steel sheet pile 41 to be clamped. In the same way, the rear clamp 3c moves forward (toward the side of the chucking machine 10) by 25 mm. Thereby, the clamp-claw pitch 66 (distance between the center of each clamp claw 25) between each clamp claw 25 (the fixed clamp claw 12 + the movable clamp claw 13) of the front clamp 3a, the * middle clamp 3b and the rear clamp 3c becomes 635 mm. **e.

Hence, as shown in Fig. 27, the movable clamp claw 13 offset backward is viewed from the front clamp 3a while the movable clamp claw 13 offset forward is viewed from the rear clamp 3c.

If the joint pitch of the U-steel sheet pile 31 or Z-steel sheet pile 41 to be clamped is 630 mm, the center part of the clamp claw 25 shifts by a maximum of mm from the joint pitch of the U-steel sheet pile 31 or Z-steel sheet pile 41. Thus, it is within the range of the web 31a of the U-steel sheet pile 31. In the case of the Z-steel sheet pile 41 likewise, the joints 41c are housed in the concave portions 16 and 17 and it is within the range of the two mutually-engaged flanges 41b. This makes it possible for the same steel-sheet-pile press-in and extraction machine 1 to universally clamp the U-steel sheet pile 31 or Z-steel sheet pile 41 having such a joint pitch. At the same time, if the size of the insertion hole 51 of the chucking machine 10 is suitably selected, the same advantage as Figs. 24 and 25 can be obtained.

Fig. 28 is a plan view showing a positional relationship of the clamping device 3 capable of handling the U-steel sheet pile 31 or the Z-steel sheet pile 41 having a joint pitch of 575 mm or 580 mm. Fig. 29 is a side view of the steel-sheet-pile press-in and extraction machine 1. In this case, the front clamp 3a and the rear clamp 3c are exchanged. Hence, the rear clamp 3c is placed ahead (on the side of the chucking machine 10); the front clamp 3a, behind; and the middle clamp 3b, unchanged in the middle. Thereby, the clamp pitch 65 (distance between each action center) between each clamp cylinder 15 of the front clamp 3a, the middle * clamp 3b and the rear clamp 3c can be varied to 560 mm. S.'.

The fixed clamp claw 12 and movable clamp claw 13 of the : *** front clamp 3a located behind move backward (opposite to *.. S * the chucking machine 10) by 25 mm in parallel to the neutral axis (see Figs. 33 and 35) of the already-disposed U-steel sheet pile 31 or Z-steel sheet pile 41 to be clamped. The rear clamp 3c located ahead moves forward (toward the side of the chucking machine 10) by mm. Thereby, the clamp-claw pitch 66 (distance between the center of each clamp claw 25) between each clamp claw 25 (the fixed clamp claw 12 + the movable clamp claw 13) of the front clamp 3a, the middle clamp 3b and the rear clamp 3c becomes 585 mm.

Hence, as shown in Fig. 29, the positions of the clamp 3a and the clamp 3c are exchanged, and thus, the clamp 3a is behind in the direction opposite to the chucking machine 10 and the clamp 3c is ahead in the direction of the chucking machine 10. Then, the movable clamp claw 13 offset backward is viewed from the front clamp 3a while the movable clamp claw 13 offset forward is viewed from the rear clamp 3c.

If the joint pitch of the U-steel sheet pile 31 or Z-steel sheet pile 41 to be clamped is 575 nun or 580 ram, the center part of the clamp claw 25 shifts by a maximum of 10 mm from the joint pitch of the U-steel sheet pile 31 or Z-steej. sheet pile 41. Thus, it is within the range of the web 31a of the U-steel sheet pile 31. In the case of the Z-steel sheet pile 41 likewise, the joints 41c are housed in the concave portions 16 and 17 and it is within the range of the two mutually-engaged flanges 41b. This makes it possible for the same steel-sheet-pile press-in and extraction machine 1 to universally clamp the U-steel sheet pile 31 * or Z-steel sheet pile 41 having such a joint pitch. At * *as the same time, if the size of the insertion hole 51 of : **, the chucking machine 10 is suitably selected, the same *** S * advantage as Figs. 24 and 25 can be obtained.

In this way, according to the above described embodiment, the single steel-sheet-pile press-in and extraction machine 1 can clamp, chuck, and press in and extract the U-steel sheet pile 3]. having a joint pitch of 600 mm or 700 mm, or the Z-steel sheet pile 41 having a joint pitch of 575 mm, 580 mm, 630 mm, 670 mm, 675 mm or 700 mm. Besides, the movement distances or sizes of the fixed clamp claw 12 and the movable clamp claw 13 can be changed to thereby handle a wider range of joint pitches. The engineering work can also be executed for the U-steel sheet pile 31 having a joint pitch of 400 mm or 500 mm, or the U-steel sheet pile 31 or the Z-steel sheet pile 41 having another joint pitch, which is currently in use. Incidentally, the present invention is especially advantageous to the U-steel sheet pile 31 or the Z-steel sheet pile 41, but it can also be applied to a hat-shaped steel sheet pile or a steel sheet pile having another shape. Particularly, the clamping device 3 can be applied as it is.

Fig. 30 is a schematic plan view showing how to execute engineering work for a first one of the U-steel sheet piles 31. Fig. 31 is a plan view showing' how to execute engineering work for a first one of the Z-steel sheet piles 41.

Industrial Applicability

The steel-sheet-pile press-in and extraction machine according to the present invention can clamp a o:' 25 steel sheet pile having any joint pitch as an already-disposed piling. Even if a clamping device cannot clamp the already-disposed steel sheet pile as it is because * its joint pitch is unfit for i't, then without varying the distance between each of a plurality of clamp r 30 cylinders, a plurality of clamp claws are moved in the ** direction parallel to the neutral axis of the already-disposed steel sheet pile to thereby change the distance between each clamp claw. Hence, it can handle a steel sheet pile having an arbitrary joint pitch over a wider range. Furthermore, a clamp claw has a concave portion surrounding and housing a joint portion of a Z-steel sheet pile. This makes it possible to clamp already-disposed piling, whichever it may be, a Z-steel sheet pile or a U-steel sheet pile, as already-disposed piling. Moreover, a chucking machine has an insertion hole for inserting each of a U-steel sheet pile and a Z-steel sheet pile in a mutually symmetrical position.

Therefore, the single steel-sheet-pile press-in and extraction machine can press in and extract both a U-steel sheet pile and a Z-steel sheet pile. Therefore, the general-purpose steel-sheet-pile press-in and extraction machine can be obtained which is capable of handling a steel sheet pile, whatever joint pitch it may have, and both a U-steel sheet pile and a Z-steel sheet pile. * ** * * * * ** I... * S S... * S. * S S S..

S S..

S

S. **3*

S S S..

S

Claims

Claims 1. A steel-sheet-pile press-in and extraction machine,

characterized by including: a plurality of clamping devices each of which clamps an already-disposed steel sheet pile by allowing a clamp cylinder to stretch a movable clamp claw toward a fixed clamp claw, with a clamp claw made up of the fixed clamp claw and the movable clamp claw straddling an upper-end part of the steel sheet pile; a chucking machine which chucks the steel sheet pile to be pressed in and extracted by allowing a chuck cylinder to stretch a movable chuck claw toward a fixed chuck claw, with the steel sheet pile inserted through between the fixed chuck claw and the movable chuck claw; and a press-in and extraction cylinder for pressing in and extracting the chucked steel sheet pile, in that the position of the clamp claw of each clamping device is adjustable.
2. The steel-sheet-pile press-in and extraction machine according to claim 1, characterized in that the position of the clamp claw of each clamping device is e.

**"25 adjustable without varying the distance between each of is** the plurality of clamp cylinders. S. .

*
3. A steel-sheet-pile press-in and extraction machine, S..

characterized by including: : 30 a clamping device having a front clamp, a middle clamp and a rear clamp which clamps an already-disposed steel sheet pile by allowing a clamp cylinder to stretch a movable clamp claw toward a fixed clamp claw, with a clamp claw formed by the fixed clamp claw and the movable clamp claw straddling an upper- end part of the steel sheet pile; a chucking machine which chucks the steel sheet pile to be pressed in and extracted by allowing a chuck cylinder to stretch a movable chuck claw toward a fixed chuck claw, with the steel sheet pile inserted through between the fixed chuck claw and the movable chuck claw; and a press-in and extraction cylinder for pressing in and extracting the chucked steel sheet pile, in that: each clamping device slides freely along a rail perpendicularly to the neutral axis of the already-disposed steel sheet pile to be clamped by stretching and shrinking each clamp exchange cylinder of the front clamp, the middle clamp and the rear clamp; the action center line of the clamp cylinder of the front clamp shifts to the side of the chucking machine and the action center line of the clamp cylinder of the rear clamp shifts to the side opposite to the chucking machine by a specific distance from the center line of the rail; the clamp pitch between each of the front clamp, the middle clamp and the rear clamp varies by exchanging * U. the positions of the front clamp and the rear clamp; and S...

the position of the clamp claw of the clamping I.. device is adjustable. S..
4. The steel-sheet-pile press-in and extraction machine according to claim 1, 2 or 3, characterized in that the clamp claw of the clamping device is movable in parallel to the neutral axis of the already-disposed steel sheet pile.
5. The steel-sheet-pile press-in and extraction machine according to claim 1, 2, 3 or 4, characterized in that the distance between each of the plurality of clamp claws varies by making the clamp claw of the clamping device movable in parallel to the neutral axis of the already-disposed steel sheet pile.
6. The steel-sheet-pile press-in and extraction machine according to claim 1, 2, 3, 4 or 5, characterized in that the steel sheet pile having an arbitrary joint pitch is freely pressed in and extracted by varying the distance between each of the plurality of clamp claws.
7. The steel-sheet-pile press-in and extraction machine according to claim 1, 2, 3, 4, 5 or 6, characterized in that only the movable clamp claw is exchangeable by attaching the movable clamp claw to the clamp cylinder via a supporter.
8. The steel-sheet-pile press-in and extraction machine according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that a concave portion is formed in a :::25 position where the movable clamp claw and the fixed S...

clamp claw face each other, and a Z-steel sheet pile is clamped by surrounding a joint portion of the Z-steel * sheet pile with the concave portion.

S
9. The steel-sheet-pile press-in and extraction machine according to claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that the chucking machine has an insertion hole for inserting each of a ti-steel sheet pile and a Z-steel sheet pile in a mutually symmetrical position.
10. The steel-sheet-pile press-in and extraction machine according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized in that the chucking machine: allows the fixed chuck claw and the movable chuck claw to face each other in such a way that a web of the steel sheet pile to be pressed in and extracted is inserted through in a middle thereof in plan view; and has an insertion hole for inserting a flange of the steel sheet pile to be pressed in and extracted in a mutually symmetrical position on each side thereof in plan view.
11. The steel-sheet-pile press-in and extraction machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, characterized in that only the movable chuck claw is exchangeable by attaching the movable chuck claw to the chuck cylinder via a supporter. * .* *. * * *e *.** * * * S. * S * n.. S

S 0*S

S *

** *.. * S

S S..