JP6395466B2 - Footing of wall structure - Google Patents

Description

  The present invention relates to a footing of a wall-like structure such as a seawall, a breakwater, and a retaining wall.

Precast reinforced concrete products (PCa) are also used as constituent members of wall-like structures such as seawalls, breakwaters, and retaining walls. PCa increases the toughness and durability of the wall-like structure, and contributes to facilitating the construction and shortening the construction period.
The superstructure of this type of wall-like structure is composed of a wall body and a footing. From the viewpoint of the toughness and durability, it is desirable that the wall body and the footing are joined via a shear key part.

  A main problem to be solved by the present invention is that a shear key part can be easily and appropriately formed at a joint part between a footing and a PCa wall constituting this type of wall-like structure.

In order to achieve the above object, according to the present invention, from the first aspect, the footing of the wall-like structure is a groove formed in the wall continuous direction formed at the lower end of the wall body constituting the wall-like structure. A footing that has a sheer key part that fits in a concave shape on the top surface,
The footing is formed by driving concrete into the outside of a steel frame, and
The shear key part is formed by a rectangular steel pipe having a rectangular cross-section with the lower end of the pipe fixed to the upper part of the frame-like part and the length direction along the wall continuous direction, and concrete driven into the rectangular steel pipe. It was supposed to be.

  The shear key portion can be formed by driving concrete into the steel pipe using the steel pipe fixed to the steel frame in the footing as a mold. The shear key portion is made of the steel pipe and the concrete driven into the steel pipe, is tough, and has an optimum structure for transmitting shearing force.

Moreover, in order to achieve the said subject, in this invention, from the 2nd viewpoint, the footing of a wall-like structure is made into the wall continuous direction formed in the lower end of the wall body which comprises a wall-like structure. A footing with a sheer key part that fits in the groove-shaped recess that follows, on the top surface,
The footing is formed by driving concrete into the outside of a steel frame, and
The shear key part is formed with a shape steel having a lower end fixed to the upper part of the frame-like part as a core .

  According to this configuration, the shear key portion can be formed using the shape steel fixed to the steel frame-like portion in the footing. The shear key part is formed from a mortar or the like that is injected between the shape steel and the footing while the wall is supported between the shape steel and the shape steel as a core, and is hardened and has a shearing force. It has the most suitable structure for transmission.

Further, in the invention according to the first aspect or the second aspect, a male screw body provided on the footing so as to partially protrude upward from the top surface of the footing;
A nut body screwed on the male screw body;
A bracket body that is detachably provided on a side portion on the lower end side of the wall body, and has a through-hole through which the male screw body passes, and is supported by the nut body in a state in which the male screw body is passed through the through-hole. ,
It is one of the preferred embodiments of the present invention that the lower end side of the male screw body in the adjustment jig provided with is fixed to the frame-like part so as to be removable.

  In this case, the wall body is supported on the footing, and the inclination of the wall body is maintained in an adjustable manner until the finishing construction is completed by injecting a filler therebetween. be able to.

  According to the present invention, the shear key portion can be easily and appropriately formed at the joint portion between the footing constituting the wall-like structure and the PCa wall body.

FIG. 1 is a perspective view of a frame-like portion and a steel pipe constituting a footing according to an embodiment of the present invention. FIG. 2 is a perspective view of the footing. FIG. 3 is a perspective view showing a state in which a wall is supported on the footing. FIG. 4 is a perspective view showing a construction completion state in which a filler is injected into the joint between the footing and the wall body from the state of FIG. 3. FIG. 5 is a side configuration diagram illustrating the state of FIG. 3. FIG. 6 is a perspective view showing a usage state of the adjustment jig. FIG. 7 is a side configuration diagram illustrating the state of FIG. 6. FIG. 8 is a perspective view of the frame-shaped portion and the shape steel constituting the footing according to the embodiment (second example) of the present invention.

  Hereinafter, typical embodiments of the present invention will be described with reference to FIGS. The footing F according to this embodiment is a part of a wall-like structure such as a seawall, a breakwater, and a retaining wall. The footing F forms an upper part of the wall-like structure together with the wall body W. In the case of a seawall, the footing F is typically fixed to a pile head (not shown) of a steel pipe pile as a foundation.

  The footing F includes a sheer key portion 1 on the top surface 2 that fits in a recess 5a formed in the lower end 5 of the wall body W constituting the wall-like structure.

  FIG. 4 shows the joint portion between the footing F and the wall body W by omitting the description of the ground, and the footing F shows only the main part thereof.

  In FIG. 4, the symbol W is a PCa wall and the symbol F is a footing. The wall body W has two wide side surfaces 6 and 6 and two narrow side surfaces 7 and 7 so that the narrow side surface 7 serves as a joint portion between adjacent wall bodies W (not shown). It has become. Such a narrow side surface 7 is aligned in the x direction in FIG. 4 (hereinafter, this direction is referred to as a wall continuous direction x) by a plurality of wall bodies W arranged to face each other with the narrow side surface 7 of the adjacent wall body W. The following wall-like structure is constructed. The lower end 5 of the wall W is a rectangular horizontal plane that is long in the wall continuous direction x. The recess 5a has a groove shape continuing in the wall continuous direction x.

  The shear key portion 1 protrudes upward from the top surface 2 of the footing F. In the example shown in the drawing, the shear key portion 1 that fits in the recess 5a of one wall W is divided into two. Specifically, the shear key portion 1 is composed of two projecting portions 1a and 1a each having a rectangular horizontal cross-sectional shape. Each protruding portion 1a has a length side along the wall continuous direction x and a width side orthogonal to the wall continuous direction x, and a gap 1b is formed between the two protruding portions 1a. (FIG. 2).

  In the illustrated example, a plurality of sleeves 8, 8... Are incorporated on both sides of the wall W with the recess 5a interposed therebetween (see FIG. 5). Each sleeve 8 has its cylinder axis arranged vertically, and the cylinder opening is opened at the lower end 5 of the wall body W. On the other hand, on the top surface 2 of the footing F and on both sides of the sheer key portion 1, the upper end side of a reinforcing bar 3 fixed to a frame-like portion 4 described later protrudes upward. In the illustrated example, the shear key portion 1 of the footing F is placed in the recess 5a of the wall body W, and the upper end sides of the plurality of reinforcing bars 3, 3,. Each is accommodated in a sleeve 8, the top surface 2 of the footing F and the lower end 5 of the wall body W are brought into contact with each other, and the wall body W is supported on the footing F.

  The footing F is formed by driving concrete C into the outside of the steel frame-like portion 4. At the same time, the shear key part 1 is formed by a steel pipe 1c having a pipe lower end fixed to the upper part of the frame-like part 4, and a concrete C 'driven into the steel pipe 1c.

  In the illustrated example, the frame-like portion 4 is formed of a steel frame 4a having an H-shaped cross section. In the illustrated example, the frame-shaped portion 4 includes a first steel frame 4a ′ disposed so as to be orthogonal to the wall continuous direction x, and a second steel frame 4a ″ disposed so as to extend along the wall continuous direction x. In the example shown in the drawing, the two first steel frames 4a ′ and 4a ′ are connected by the two second steel frames 4a ″ and 4a ″, thereby forming a rectangular inner space. The frame-like portion 4 having 4e is formed, and the four steel frames 4a ... 4a are combined so that the flange 4b is positioned horizontally.

  In the illustrated example, the steel pipe 1c is a square steel pipe 1c. In the illustrated example, a steel pipe 1c is fixed to each of the two first steel frames 4a 'and 4a'. The steel pipe 1c has a substantially rectangular cross-sectional shape, and the lower end of the pipe positioned on the flange 4b of the first steel frame 4a ′ in a state where about half of the total length is positioned on the frame inner space 4e. Is welded to the flange 4b. Moreover, the two said steel pipes 1c are being fixed to the upper part of the said frame-shaped part 4 so that the length direction may be along the said wall continuous direction x (FIG. 1).

  The concrete frame C is driven into the outside of the frame-like portion 4 so that the inside of the frame-internal space 4e of the frame-like portion 4 and the two steel pipes 1c, 1c are filled with the concrete C ′. A footing F having a frame-like portion 4 made of 4a and having the shear key portion 1 composed of the two protruding portions 1a and 1a is formed on the top surface 2 (FIGS. 1 to 2). In the illustrated example, the rebar 3 is passed through a through hole formed in the upper flange 4b of the steel frame 4a and a through hole formed in the lower flange 4b on the frame inner space 4e side. 3 is fixed to the steel frame 4a by a nut 3a that is screwed to the lower end of the steel bar 3 and a lock nut 3b that is screwed to the middle part of the reinforcing bar 3. The concrete is driven so as to cover the upper flange 4b of the steel frame 4a with a predetermined cover thickness below the upper end of the reinforcing bar 3 above the frame-like portion 4 (FIG. 5).

  The footing F according to this embodiment is formed by driving the concrete into the steel pipe 1c using the steel pipe 1c fixed to the frame 4 made of steel frame 4a in the footing F as a mold. be able to. The shear key portion 1 is composed of the steel pipe 1c and the concrete C 'driven therein, and is tough and has an optimum structure for transmitting shearing force.

  Further, in this embodiment, the footing F is in a state where the wall body W is supported on the footing F as described above, and a filler G such as mortar or grout is injected between them. The male screw body 9 that constitutes the adjustment jig J that maintains the inclination of the wall body W so as to be adjustable is provided so as to be removable until the finishing construction is completed.

  In the illustrated example, two such adjustment jigs J are arranged on the wide side surface 6 side of the wall body W with an interval in the wall continuous direction x, so that one wall body W and one footing F are provided. In contrast, four adjustment jigs J ... J are used.

  The adjusting jig J includes a male screw body 9 provided so as to partially protrude upward from the top surface 2 of the footing F, a nut body 10 screwed on the male screw body 9, and the wall body W. And a through hole 11c through which the male screw body 9 is passed. The male screw body 9 is passed through the through hole 11c. In this state, a bracket body 11 supported by the nut body 10 is provided.

  In the illustrated example, the male screw body 9 is passed through a through-hole formed in the upper flange 4b of the first steel frame 4a ′, and the male screw body 9 projects to the lower surface side of the upper flange 4b. A nut-like insert 9 a is screwed to the lower end of the screw body 9. The footing F is formed by the concrete C driven as described above with the insert 9a screwed to the male screw body 9, and a part of the male screw body 9, that is, the upper end side. Is projected vertically from the top surface 2 of the footing F. The nut body 10 is screwed at a location protruding from the top surface 2 of the footing F in the male screw body 9.

  The bracket body 11 has a vertical plate portion 11a and a horizontal plate portion 11b, and is detachably provided on the side portion of the wall body W with the vertical plate portion 11a. In the illustrated example, the bracket body 11 is attached to the wall body W by screwing a bolt 11d to a nut-like insert 11e built in the wall body W through a through hole of the vertical plate portion 11a. ing. A through hole 11c through which the male screw body 9 passes is formed in the horizontal plate portion 11b. Reference numeral 11f in the drawing denotes a tightening nut that clamps the lateral plate portion 11b with the nut body 10.

  The wall body W can be supported on the footing F without tilting by screwing the nut body 10 constituting the adjusting jig J back and forth. In the illustrated example, the male screw body 9 is passed through the through hole 11c of the bracket body 11 from the state in which the nut bodies 10 of the four adjustment jigs J... J are positioned on the same horizontal plane by the screwing back and forth. On the other hand, the wall W is supported on the footing F as described above (FIG. 7). From the state of FIG. 7, the recess is formed between the top surface 2 of the footing F and the lower end 5 of the wall W. The filler G is injected so that the inside of 5a is filled with the filler G. The finishing operation is completed by the hardening of the filler G. After that, the male screw body 9 is removed from the insert 9a in the footing F, and the bolt is removed from the insert 11e of the wall body W. Removal is made. In FIG. 4, what is indicated by a symbol W ′ is an air vent hole for injecting the filler G.

  FIG. 8 shows an example in which the shear key portion 1 is formed of a shape steel 1 d having a lower end fixed to the upper portion of the frame-like portion 4. In the illustrated example, the shear key portion 1 is formed by cutting the H-section steel 1d ′ in a direction orthogonal to the length direction and welding the cut end portion to the flange 4b of the first steel frame 4a ′. The shape steel 1d is provided on the upper portion of the frame-like portion 4. The flange of the H-shaped steel 1d 'is arranged so as to be parallel to the length direction of the first steel frame 4a'. In this case, the shear key portion 1 can be formed by using the shape steel 1d fixed to the frame-like portion 4 made of the steel frame 4a in the footing F. The shear key portion 1 is injected between the shape steel 1d and the footing F in a state where the wall W is supported, and the filler G such as mortar is cured between the shape steel 1d and the outer shape. It is formed from tough and has an optimal structure for transmitting shear force. The remaining configuration of the example shown in FIG. 8 is substantially the same as the example shown in FIGS.

  Of course, the present invention is not limited to the embodiments described above, but includes all embodiments that can achieve the object of the present invention.

W Wall body F Footing C, C 'Concrete 1 Shear key part 4 Frame part 4a Steel frame 5 Lower end 5a Recess

Claims (3)

A footing comprising a sheer key part on the top surface that fits in a groove-like recess formed in the wall continuous direction formed at the lower end of the wall body constituting the wall-shaped structure,
The footing is formed by driving concrete into the outside of a steel frame, and
The shear key part is formed by a rectangular steel pipe having a rectangular cross-section with the lower end of the pipe fixed to the upper part of the frame-like part and the length direction along the wall continuous direction, and concrete driven into the rectangular steel pipe. Footing for wall-like structures. A footing comprising a sheer key part on the top surface that fits in a groove-like recess formed in the wall continuous direction formed at the lower end of the wall body constituting the wall-shaped structure,
The footing is formed by driving concrete into the outside of a steel frame, and
The shear key part is a footing of a wall-like structure, and is formed with a shape steel having a lower end fixed to the upper part of the frame-like part as a core . A male screw body provided on the footing so as to project a part upward from the top surface of the footing;
A nut body screwed on the male screw body;
A bracket body that is detachably provided on a side portion on the lower end side of the wall body, and has a through-hole through which the male screw body passes, and is supported by the nut body in a state in which the male screw body is passed through the through-hole. ,
The footing of a wall-shaped structure according to claim 1 or 2, wherein a lower end side of the male screw body in an adjustment jig comprising:

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