JP2014148788A - Driving tool for z-shaped steel sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving tool that suppresses torsion of a flange in driving and that can improve construction quality.SOLUTION: A driving tool 1 includes: a bearing plate 11 that abuts on an upper end of a Z-shaped steel sheet pile 2 from above; a chuck holding part 12 that is provided protrusively upward from the bearing plate 11 and held in a sandwiched state by a single chuck 31; flange holding parts 13A and 13B that hold flanges 22A and 22B in a position point-symmetric with respect to at least a barycentric position O of the Z-shaped steel sheet pile 2; and a barycentric holding part 13C in which the barycentric position O of the Z-shaped steel sheet pile 2 is set as a holding position. In the driving tool 1, the chuck holding part 12 is arranged in the barycentric position O.

Description

  The present invention relates to a placing jig in a Z-shaped steel sheet pile.

  Conventionally, a Z-shaped steel sheet pile used as a revetment or the like in the civil engineering field or the building field is known (see, for example, Patent Document 1). When placing such a Z-shaped steel sheet pile, as shown in FIG. 8, an intermediate portion of the web 21 that becomes the center-of-gravity position O of the Z-shaped steel sheet pile 2 with a single chuck attached to a vibro hammer ( The gripped portion T) is gripped directly or via a placing jig P, and is placed on the Z-shaped steel sheet pile 2 while applying a vibration load of a vibro hammer.

JP 2002-294691 A

  However, in the conventional Z-shaped steel sheet pile driving method, as shown in FIG. 8, the middle portion of the web 21 at the center of gravity O of the Z-shaped steel sheet pile 2 is gripped by a single chuck. Is not evenly applied to the Z-shaped steel sheet pile 2, and in particular, the two flanges 22 located away from the gripped portion T of the Z-shaped steel sheet pile 2 are easily shaken and twisted (the arrow in FIG. 8 indicates the direction of twisting). There is room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and provides a placing jig for a Z-shaped steel sheet pile that can suppress the twisting of the flange during placing and can improve the construction quality. The purpose is to do.

  In order to achieve the above object, in the Z-shaped steel sheet pile according to the present invention, the Z-shaped steel sheet pile has a Z-shape consisting of a pair of parallel flanges having joints at ends extending in opposite directions to both ends of the web. A driving jig for gripping a Z-shaped steel sheet pile by a single chuck of a vibro hammer when driving a Z-shaped steel sheet pile, which is a steel sheet pile, hitting the upper end of the Z-shaped steel sheet pile from above. Contact pressure plate, projecting upward from the pressure plate and gripped by the single chuck, and flange or web at a position that is at least symmetrical with respect to the center of gravity of the Z-shaped steel sheet pile And a sheet pile gripping part for gripping the corners of the flange, and the chuck gripping part is arranged at the center of gravity position.

In the present invention, with the placement jig mounted on the Z-shaped steel sheet pile, the chuck gripping portion is provided at the center of gravity of the Z-shaped steel sheet pile, and the flange or The corner portion can be gripped and placed by the sheet pile gripping portion. That is, since the flanges or corners located on both sides of the center of gravity of the Z-shaped steel sheet pile are gripped positions by the sheet pile gripping portion, the vibration load of the vibro hammer is cross-sectioned against the flange and web of the Z-shaped steel sheet pile It is given uniformly by distributing the stress throughout, and the twist associated with the deflection of the flange portion can be suppressed, and the construction quality of the cast Z-shaped steel sheet pile can be improved.
In particular, when the wall thickness is thin, or when the corner portion that tends to be a starting point of twisting is gripped by the sheet pile gripping portion, the occurrence of twisting can be further reduced.

  Moreover, in the placing jig for the Z-shaped steel sheet pile according to the present invention, the sheet pile gripping portion grips the outer gripping portion having the gripping position at the flange or the corner portion, and the center of gravity position of the Z-shaped steel sheet pile. It is preferable to have a center-of-gravity gripping portion as a position.

  In this case, the outer gripping portion that grips the flange or corner portion described above is in a point-symmetrical position with respect to the center of gravity, so that the center of gravity of the Z-shaped steel sheet pile is also gripped by the center of gravity gripping portion. Thus, the occurrence of twisting can be further suppressed.

  Moreover, in the jig for placing in the Z-shaped steel sheet pile according to the present invention, the Z-shaped steel sheet pile comprises an odd number of sheets to form a wall body, and when the wall body is simultaneously placed, the sheet pile is In the gripping portion, the outermost edge Z-shaped steel sheet pile flange or corner of the wall body is gripped, and at least one of the plurality of Z-shaped steel sheet piles is gripped. It may be.

In this case, the vibration load of the vibro hammer is evenly transmitted to all the Z-shaped steel sheet piles constituting the wall body, the vibration of the entire wall body can be suppressed, and the twist can be eliminated.
Further, according to the present invention, the outermost flange or corner portion in the wall direction of the wall body constituted by an odd number of a plurality of Z-shaped steel sheet piles is gripped by the sheet pile gripping portion, and the Z-shaped steel sheet pile Since each of these is gripped at least by the sheet pile gripping portion, the wall body can be integrally driven without shifting or separating the plurality of Z-shaped steel sheet piles.

  According to the placing jig in the Z-shaped steel sheet pile of the present invention, the twist of the flange at the time of placing can be suppressed, and the construction quality can be improved.

It is a perspective view which shows the jig | tool for placement of the state which hold | gripped the Z-shaped steel sheet pile by embodiment of this invention. It is an AA arrow directional view shown in FIG. 1, Comprising: It is a side view which shows the placing jig | tool of the state which hold | gripped the Z-shaped steel sheet pile. It is the figure which looked at the Z-shaped steel sheet pile from the top, Comprising: It is the figure which showed the holding position of the sheet pile holding part in the jig | tool for placement. It is the perspective view which looked at the jig | tool for placement from diagonally downward. It is the figure which looked at the Z-shaped steel sheet pile by a 1st modification from the top, Comprising: It is a figure corresponding to FIG. 3 which showed the holding position of the sheet pile holding part in the jig | tool for placement. It is the figure which looked at the Z-shaped steel sheet pile by a 2nd modification from the top, Comprising: It is a figure corresponding to FIG. 3 which showed the holding position of the sheet pile holding part in the jig | tool for placement. It is the figure which looked at the Z-shaped steel sheet pile by a 3rd modification from the top, Comprising: It is a figure corresponding to FIG. 3 which showed the holding position of the sheet pile holding part in the jig | tool for placement. It is the figure which looked at the conventional Z-shaped steel sheet pile from the top, Comprising: It is the figure which showed the holding position of the sheet pile holding part in the placing jig.

  Hereinafter, a placing jig in a Z-shaped steel sheet pile according to an embodiment of the present invention will be described based on the drawings.

  As shown in FIGS. 1 and 2, the placing jig 1 according to the present embodiment has a Z-shaped steel sheet pile 2 by a single chuck 31 attached to the vibro hammer 3 when placing the Z-shaped steel sheet pile 2. It is a jig for gripping.

Here, the Z-shaped steel sheet pile 2 of the present embodiment applied to the placing jig 1 includes a web 21 and a pair of parallel pairs extending in opposite directions to both ends of the web 21 as shown in FIG. The flange 22 (22A, 22B) and the joint part 23 provided in the front-end | tip of each flange 22A, 22B are provided. In addition, the code | symbol O shown in FIG.1 and FIG.3 has shown the gravity center position which passes along a wall body gravity line when Z-shaped steel sheet pile 2 is installed in the shape of a wall by planar view (top view).
Moreover, in FIG. 1, the wall body direction of the wall body (illustration omitted) comprised by placing several Z-shaped steel sheet piles 2, 2, ... is shown with the code | symbol X, and orthogonal to the wall body direction X The wall orthogonal direction is indicated by the symbol Y.

  As shown in FIG. 1, the placing jig 1 is configured to grip both the flanges 22 </ b> A and 22 </ b> B of the Z-shaped steel sheet pile 2 and the center of gravity O of the web 21 and to be gripped by the single chuck 31. ing. Specifically, as shown in FIGS. 1 and 4, the placing jig 1 includes a belt-shaped bearing plate 11 and a chuck that is suspended from the longitudinal center of one surface (upper surface 11 a) of the bearing plate 11. A gripping portion 12 and sheet pile gripping portions 13 (flange gripping portions 13A and 13B (outside gripping portions) and a gravity center gripping portion 13C) provided at predetermined three locations on the other surface (lower surface 11b) of the bearing plate 11 are provided. ing.

  The chuck holding portion 12 is a plate-like member that protrudes and is fixed perpendicularly to the upper surface 11 a of the bearing plate 11 in the out-of-plane direction, and has a thickness dimension that can be held by the single chuck 31. . By making the width of the chuck gripping portion 12 larger than the single chuck width of the vibro hammer, the chuck can grip the placement jig 1 stably at the time of placement. Further, the length of the chuck gripping portion 12 is set to be equal to or longer than the chuck length of the vibro hammer so that the chuck gripping portion 12 can be securely gripped by the entire chuck surface having irregularities. The thickness of the chuck gripping portion 12 is designed so as not to be deformed by vibration caused by a vibro hammer. Specifically, it is preferable that the distance between the center of the chuck holding portion 12 and the bearing plate 11 is a moment length so that the deformation is minimized with respect to the moment when the weight of the vibro hammer swings in the horizontal direction. In addition, the plate thickness and the plate width are secured so as not to yield when the vibro hammer weight acts in the vertical direction.

  The three sheet pile gripping portions 13 (13A, 13B, 13C) provided on the bearing plate 11 have a pair of accessory plates 13a spaced apart from each other in parallel and facing each other so as to be more out of the lower surface 11b of the bearing plate 11. Projected perpendicular to the direction. The placing jig 1 inserts the upper end of the Z-shaped steel sheet pile 2 between the pair of accessory plates 13a, and the pair of accessory plates 13a and the Z-shaped steel sheet pile 2 are bolts and nuts (not shown). It is connected by joining. Therefore, bolt holes 13b are formed in the pair of accessory plates 13a at positions facing each other. The Z-shaped steel sheet pile 2 is provided with a hole for inserting a bolt at a position corresponding to the bolt hole 13b on site or in advance at a factory or the like.

  Here, as shown in FIGS. 1 and 3, the three sheet pile gripping portions 13 have flange gripping portions 13 </ b> A and 13 </ b> B arranged on both sides in the longitudinal direction of the bearing plate 11 extending in plan view of the flanges 22 </ b> A and 22 </ b> B, respectively. The center-of-gravity gripping portion 13C can grip the center-of-gravity position O (third gripped portion T3) of the web 21 at a position where the substantially intermediate portion (first gripped portion T1, second gripped portion T2) in the current direction can be gripped. It is provided in the bearing plate 11 so as to be in a proper position. That is, the flange gripping portions 13A and 13B grip the flanges 22A and 22B that are point-symmetric with respect to the center of gravity O (third gripped portion T3) of the Z-shaped steel sheet pile 2. Therefore, the three sheet pile gripping portions 13A, 13B, and 13C are arranged on a straight line that passes through the gravity center position O.

  The protruding length of the sheet pile gripping portion 13 from the bearing plate 11 is such that the vibration load of the vibrator hammer is sufficiently transmitted to the Z-shaped steel sheet pile 2 in a state where the gripped portions T1 to T3 of the Z-shaped steel sheet pile 2 are gripped. It can be set arbitrarily.

Next, the effect | action of the jig | tool for placement in the Z-shaped steel sheet pile mentioned above is demonstrated in detail based on drawing.
As shown in FIG. 1, in the present embodiment, the chuck gripping portion 12 is provided at the center of gravity O of the Z-shaped steel sheet pile 2 with the placing jig 1 mounted on the Z-shaped steel sheet pile 2, and The flanges 22A and 22B that are likely to be shaken when the Z-shaped steel sheet pile 2 is driven can be gripped and driven by the flange gripping portions 13A and 13B.
That is, since the flanges 22A and 22B located on both sides of the center of gravity O of the Z-shaped steel sheet pile 2 are gripped positions (the gripped portions T1 and T2) by the sheet pile gripping portion 13, the flange 22A of the Z-shaped steel sheet pile 2 , 22B, the vibration load of the vibro hammer 3 is stress-distributed over the entire cross section, and the torsion accompanying the vibration of the flange portion can be suppressed, and is input from the vibro hammer due to the vibration of the flanges 22A, 22B at the time of placing By suppressing energy loss, the energy input to the vibro hammer can be efficiently transmitted to the lower end of the steel sheet pile, and deformation of the cast Z-shaped steel sheet pile 2 can be suppressed and linearity in the material axis direction can be maintained. The construction quality and the flatness of the wall can be improved.

  Further, in the present embodiment, the flange gripping portions 13A and 13B (outer gripping portions) that grip the flanges 22A and 22B described above are point-symmetrical with respect to the center of gravity position O, and further the center of gravity position of the Z-shaped steel sheet pile 2 By grasping O with the center-of-gravity grasping portion 13C, a more stable grasping state can be obtained, and the occurrence of twist can be further suppressed.

  The above-described placing jig 1 is created according to the shape of the Z-shaped steel sheet pile 2 to be placed. A plurality of placement jigs 1 are prepared in advance at the placement site (site), and the placement jig 1 is attached to the upper end of the Z-shaped steel sheet pile 2 to be placed next. Thus, work efficiency can be improved.

  In the jig for placing in the Z-shaped steel sheet pile according to the present embodiment described above, twisting of the flanges 22A and 22B of the Z-shaped steel sheet pile 2 at the time of placing can be suppressed, and the flanges 22A and 22B at the time of placing can be suppressed. By suppressing the loss of energy input from the vibro hammer due to vibration, the input energy of the vibro hammer is efficiently transmitted to the lower end of the steel sheet pile, and the deformation of the placed Z-shaped steel sheet pile 2 is suppressed, so Since linearity can be maintained, it is possible to improve the construction quality and the flatness of the wall.

  As mentioned above, although the embodiment of the placing jig in the Z-shaped steel sheet pile according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the spirit thereof. It is.

For example, in the placing jig 1 according to the above-described embodiment, a sheet pile gripping portion 13A that grips the three flanges 22A and 22B of the single Z-shaped steel sheet pile 2 and the web 21 at the center of gravity O, 13B, 13C, but if it is a configuration provided with sheet pile gripping portions 13A, 13B for gripping the flange near the outer edge of at least one Z-shaped steel sheet pile 2 and two places around it, a sheet pile The grip position of the grip portion 13 is not limited to this.
For example, as shown in FIG. 5, it is possible to omit the center-of-gravity gripping portion 13C that grips the web 21 of the above-described embodiment. That is, the placing jig 1A according to the first modification has a configuration including only two flange gripping portions 13A and 13B for gripping both flanges 22A and 22B. When the plate thickness of the flange is thin, the flange easily swings during placement, so that the flange portion is firmly fixed by the placement jig 1 to enable smooth placement.

  Further, the corner gripping portion 13D (the sheet pile gripping portion, the outer gripping portion) of the placing jig 1B according to the second modified example shown in FIG. 6 is configured to target the pair of corner portions 24A and 24B. ing. That is, the fourth sheet pile gripping portion 13D has a shape in which the pair of accessory plates 13a are bent along the corner portions 24A and 24B, respectively. In this case, since the corner portions 24A and 24B that are likely to be the starting point of twisting are gripped by the sheet pile gripping portion 13D, the occurrence of the twist described above can be further reduced. This is particularly effective when the flanges and corners are thin and the flanges are more likely to swing during placement.

  Furthermore, in the placing jigs 1, 1 </ b> A, 1 </ b> B according to the above-described embodiment, the first modified example, and the second modified example, one Z-shaped steel sheet pile 2 is the object to be gripped, but the third shown in FIG. 7. The placing jig 1C according to the modified example has a case in which the wall body 10 is configured by an odd number of plural (here, three) Z-shaped steel sheet piles 2 and is placed simultaneously. In this case, the sheet pile gripping portion 13 is a flange that grips each of the flange 22A of one Z-shaped steel sheet pile 2 and the flange 22B of the other Z-shaped steel sheet pile 2 at the outermost edge in the wall body direction X of the wall body 10. Grasping portions 13A and 13B (outside gripping portions) are provided, and a gravity center gripping portion 13C for gripping the web 21 of the Z-shaped steel sheet pile 2 located at the center in the wall body direction X is provided. At this time, the three gripping portions (sheet pile gripping portions 13A, 13B, and 13C) are arranged on a straight line passing through the center of gravity O of the wall body 10, and the center of gravity gripping portion 13C that grips the web 21 is positioned at the center of gravity. O is provided.

When the wall body 10 is constituted by a plurality of Z-shaped steel sheet piles 2, a configuration is adopted in which at least one of the plurality of Z-shaped steel sheet piles 2 is gripped by the sheet pile gripping portion 13. preferable. As a result, as in the third modified example, the vibration load of the vibro hammer is evenly transmitted to all the Z-shaped steel sheet piles 2 constituting the wall body 10, so that the entire wall body can be prevented from being shaken, and the twist is eliminated. be able to. Even in the case of such a wall body, the gripping portion at the outermost edge in the wall body direction X may be the corner portions 24A and 24B instead of the flanges 22A and 22B.
In this case, the outermost flange or corner of the wall 10 in the wall body direction X is gripped by the sheet pile gripping portion, and each of the Z-shaped steel sheet piles 2 is gripped by at least the sheet pile gripping portion 13. Therefore, the plurality of Z-shaped steel sheet piles 2 are prevented from being displaced in the material axis direction, separated from the wall body direction X, or deformed in the wall body orthogonal direction Y, and the wall body 10 is driven integrally. Therefore, it is possible to form a wall body with high accuracy and faithful to the design drawing. In particular, since it is possible to prevent a shift between adjacent steel sheet piles in the direction of the material axis, it is possible to prevent the occurrence of a double drop or a high stop at the time of placing.

  The flange of the present invention may be a flange including a joint portion. The point is that any flange portion that is point-symmetric with respect to the center of gravity O of the Z-shaped steel sheet pile 2 can achieve the effects of the present invention, so the joint portion 23 at the tip of the flange 22 of the present embodiment is also a flange. If it can be regarded as a part of this, this joint part 23 can also be made into the holding object of the placement jig 1.

  Furthermore, in the said embodiment and modification, although the joining of the Z-shaped steel sheet pile 2 and the sheet pile holding part 13 of the placing jig 1 is a bolt / nut joint, other fixing means such as welding is employed. It is also possible to do.

  Furthermore, in the embodiment, the sheet pile gripping portion 13 is fixed to the bearing plate 11 and the mounting direction of the pair of accessory plates 13a is fixed according to the shape of the Z-shaped steel sheet pile 2, but the accessory plate 13a It is possible to adjust the attachment position according to the angle of the cross section of the sheet pile by providing a function such as a rotation mechanism that can adjust the mounting angle of the attachment, or by sandwiching a jig between a pair of attachment plates. May be. In this case, according to the shape of a plurality of types of Z-shaped steel sheet piles, it is possible to appropriately change the orientation of the accessory plate 13a, and there is an advantage that it is not necessary to create a plurality of types of placing jigs. is there.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1, 1A, 1B, 1C Placing jig 2 Z-shaped steel sheet pile 3 Vibro hammer 11 Bearing plate 11a Upper surface 11b Lower surface 12 Chuck gripping part 13 Sheet pile gripping part 13A, 13B Flange gripping part (sheet pile gripping part, outer gripping part)
13C Center of gravity gripping part (sheet pile gripping part)
13D Corner gripping part (sheet pile gripping part, outer gripping part)
13a Attached plate 13b Bolt hole 21 Web 22, 22A, 22B Flange 23 Joint part 24A, 24B Corner part 31 Single chuck O Center of gravity position X Wall body direction Y Wall body orthogonal direction

Claims (3)

When a Z-shaped steel sheet pile, which is a Z-shaped steel sheet pile consisting of a pair of parallel flanges having joints at opposite ends of the web and the opposite ends of the web, is placed in a Z-shape by a single chuck of a vibro hammer. A placing jig for gripping a steel sheet pile,
A bearing plate abutting on the upper end of the Z-shaped steel sheet pile from above;
A chuck gripping portion projecting upward from the bearing plate and sandwiched by the single chuck;
At least a flange at a position that is point-symmetric with respect to the center of gravity of the Z-shaped steel sheet pile, or a sheet pile gripping portion that grips the corners of the web and the flange,
With
The jig for placing in a Z-shaped steel sheet pile, wherein the chuck gripping portion is disposed at the position of the center of gravity. The sheet pile gripping part is
An outer gripping portion having the flange or corner as a gripping position;
A center-of-gravity gripping portion having a center of gravity position of the Z-shaped steel sheet pile as a gripping position;
The jig for placing in the Z-shaped steel sheet pile according to claim 1, characterized by comprising: The Z-shaped steel sheet pile constitutes a wall body with an odd number of sheets,
When simultaneously placing the wall body, the sheet pile gripping part grips the flange or corner of the outermost Z-shaped steel sheet pile in the wall body direction of the wall body, and a plurality of the Z-shaped steel sheets The jig for placing in a Z-shaped steel sheet pile according to claim 1 or 2, wherein at least one of the sheet piles is gripped.

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