JP2935100B2 - Permanent formwork mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for preventing and reinforcing a steel structure such as a steel sheet pile using a permanent formwork.

[0002]

2. Description of the Related Art Conventionally, as a countermeasure against corrosion of a steel sheet pile, generally, an FRP cover having irregularities along its shape is attached to the sea side of the steel sheet pile with metal fittings, and the cover is filled with mortar and solidified. . However, an actual steel sheet pile has a large amount of distortion and inclination, which makes it difficult to align it with the uneven cover, and the uneven cover has the disadvantage of increasing the material and manufacturing costs.

[0003] For this reason, in recent years, a structure that can be easily attached to irregular steel sheet piles using a flat cover instead of unevenness has become widespread. Furthermore, since the FRP cover and the internal mortar have inevitably poor adhesion, to improve this, the cover itself is made of a concrete formwork, or two layers of FRP and concrete are prepared in advance, and a number of layers are formed between the formwork and the structure. Permanent forms for placing rebar have also appeared.

On the other hand, as a means for attaching a flat cover to a steel sheet pile, first, a plurality of studs or brackets are welded to the front surface of a steel sheet pile as in Japanese Patent Application Laid-Open No. 60-159061, and after the cover is attached to this, There is a method of tightening with a nut from the outside. Second, Japanese Patent Laid-Open No. 57-137
No. 529, there is a method of welding a vertically long T-shaped bracket or hook to a steel sheet pile, and dropping a concrete formwork from above onto the T-shaped bracket to fix it.

[0005]

However, a flat cover or a mold has a larger mortar filling amount than a concavo-convex cover, so the mortar pressure is large, and the resin cover is deformed or a hook portion is detached in a hook system. There are drawbacks. In addition, when a cover or a formwork is attached to a steel sheet pile that is distorted or tilted back and forth and left and right in the above-described manner, the formwork itself remains inclined. Further, in the first method, it is necessary to make a hole in the cover, and in the second method, a gap is formed without the dropped mold being in close contact with the T-shaped bracket. . In addition, the second method is effective for new construction because the form is dropped from above, but there is a drawback that it cannot be applied to the existing steel sheet pile on which concrete is piled. In addition, since a conventional seawall structure has collapsed due to a recent earthquake, a structure capable of improving seawall strength at the lowest possible cost has been required.

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to enable a formwork to be installed vertically to an existing inclined or distorted steel sheet pile without difficulty, and to provide a large mortar pressure and vibration of an earthquake. An object of the present invention is to provide a mounting structure for a permanent form that can withstand the above.

[0007]

In order to achieve the above object, the mounting structure of the present invention comprises a pair of plates fixed to the front of a steel sheet pile, a vertically long H-steel fitting fitted to the plate, A side plate that covers both sides of the steel fitting and is adjustably fixed to the pair of plates; a permanent form abutted on the surface of the H steel fitting with a certain gap therebetween; a steel sheet pile and a permanent mold; A reinforcing bar disposed between the frames, a part of which is connected to the H-steel bracket 4, a cover plate covering the gap between the permanent molds, and a boundary between the permanent molds is fixed between the H-steel bracket and the cover plate. It is composed of a fastening member.

First, a plurality of pairs of plates are fixed in a vertical direction while correcting a lateral displacement with respect to an inclined steel sheet pile. Next, a vertically long H-steel fitting whose both sides are closed by side plates is fitted between the plates, and the lateral plate portions are fixed to the plates by correcting the displacement in the front-rear direction. Subsequently, a reinforcing bar is arranged on the front surface of the steel sheet pile, and both ends are connected to a part of the H steel fitting. The permanent form is fixed between the H-steel fitting and the cover plate by a fastening member without being inclined, and since this fastening member passes through a gap between the forms, it is not necessary to provide a bolt hole in the form itself.
Further, since the H steel fitting, the side plate, and the pair of plates are combined in a box shape and the reinforcing bar is also integrated, it exhibits greater strength than conventional brackets and T-shaped fittings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 are a plan view and a side view, respectively, of a mounting structure of a permanent form to which the present invention is applied. A stud 2 is welded to enhance the adhesion, and a bottom plate for supporting the formwork is welded below the steel sheet pile 1 (not shown).

A plurality of sets of a pair of plates 3 are welded in the longitudinal direction to the front surface of the other projecting portion of the steel sheet pile 1, and a vertically long H-steel fitting 4 is fitted between the plates 3. H steel bracket 4
As can be seen from the front and side views of FIGS. 3A and 3B, portions corresponding to the plates 3 on both sides are previously closed with side plates 5, and in this embodiment, flanges 6 are provided at three positions.
Further, a plurality of square holes 7 are formed vertically at the center of the front surface of the H steel fitting 4, and a nut 8 is welded to the back of the square hole 7. The H steel fitting 4 itself can use a conventional steel material as it is, and has a square hole 7.
Can be easily formed with a laser cutter today.

On the front surface of the steel sheet pile 1 is a reinforcing bar 9 assembled in a grid.
Are arranged substantially in parallel, and both ends of each reinforcing bar 9 are welded to the web 4a of the H steel fitting 4 via the connecting plate 9a. These reinforcing bars 9 and the studs 2 play a role of reinforcement integrally with the mortar to be filled later.

On the surface of the H steel bracket 4, permanent molds 10, 10 are provided.
The rear surfaces of the ends abut with a gap S therebetween, and mortar (not shown) can finally flow into the gap S. The permanent form 10 has a two-layer structure in which a concrete layer 10b is formed on an FRP layer 10a, and a hook 11 for engaging with the flange 6 of the H steel fitting 4 is erected on the inside thereof. The boundary surface of the mold 10 is covered with an elongated cover plate 12 made of resin, and is fixed so as to be sandwiched between a washer 13 from outside, a bolt 14 and a nut 8 in a square hole.

Next, the order of mounting the permanent formwork 10 will be described. First, a bottom plate (not shown) is welded to the submerged portion of the steel sheet pile 1 and a predetermined number of recesses are formed on the steel sheet pile 1 and a predetermined number of projections are formed on the front of every other convex part. Stud 2 is welded. Subsequently, a plurality of pairs of the plates 3 are vertically welded to the remaining protrusions of the steel sheet pile 1 using a vertical jig or a gauge. With this, steel sheet pile 1 at the time of formwork installation
The horizontal displacement among the distortions and inclinations is corrected.

Next, the H steel fitting 4 is fitted between the plates 3 and 3, and the side plate 5 is welded to the plate 3 while adjusting in the front-back direction. The plate 3 is fixed vertically along the upper and lower sides of the steel sheet pile 1, but it can be corrected only in the lateral direction at the time of installation. is there. Therefore, by changing the fixing position of the side plate 5 of the H steel fitting 4 and performing welding, the front-back inclination can be corrected.

Next, a grid-like reinforcing bar 9 provided with connection plates 9a at both ends is arranged substantially parallel to the steel sheet pile 1 and each plate 9a is welded to the web 4a of the H steel fitting 4. In particular, since a flat mold has a larger mortar filling amount than an uneven cover, it is desirable to provide a means for increasing the strength and adhesion of the mortar.

Next, while the formwork 10 is hung in a well-balanced manner with a crane and a rope (not shown), H
It is brought into contact with the front of the steel fitting 4, dropped on the bottom plate, and the crane rope is removed. As can be seen from FIG.
Since the hook 11 is locked to the flange 6 of the metal fitting 4 at the fixed position, the hook 11 does not fall outside or inside.

Next, the boundary surfaces of the molds 10, 10 are covered with a cover plate 12, and bolts 14 are
Through the nut 8 in the square hole. Since the bolts 14 are inserted into the gaps S between the mold frames 10, 10, there is no need to provide bolt holes in the mold frame itself, and no excessive mounting due to displacement of the bolt holes occurs.

When the mounting of each form 10 is completed, a mortar (not shown) is filled between the steel sheet pile 1 and the form 10 so that the mortar flows into the gap S between the forms 10. Since the mortar is bonded to the stud 2, the reinforcing bar, the hook 11, and the concrete layer 10b of the formwork, the mortar does not peel off from the formwork 10 or the steel sheet pile 1 even if there is an external impact. Further, since the plate 3, the H-steel fitting 4 and the reinforcing bar 9 are integrated and have a box-shaped cross section, the mold 10 can sufficiently withstand the outward pulling of the mortar due to the expansion pressure of the mortar or even shake due to an earthquake.

[0019]

As described in detail above, according to the permanent form mounting structure of the present invention, the form can be installed vertically by adjusting the metal fitting even if the sheet pile is inclined or distorted, and the metal fitting part can be installed. Because it has considerable strength, it has the effect of resisting mortar pressure and large earthquakes. Further, the H steel fittings can be obtained at low cost, and there is no need to make holes in the formwork itself.

[Brief description of the drawings]

FIG. 1 is a plan view of a mold mounting structure.

FIG. 2 is a side view of the form mounting structure.

FIG. 3A is a front view of an H steel fitting.

FIG. 3B is a side view of the H steel fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel sheet pile 3 Plate 4 H steel bracket 5 Side plate 8 Nut 9 Reinforcing bar 10 Permanent formwork 12 Cover plate 14 Bolt S Formwork gap

Claims (1)

(57) [Claims] 1. A pair of plates 3, 3 fixed to the front surface of a steel sheet pile 1, a vertically long H-steel fitting 4 fitted in the plates 3, 3, and both sides of the H-steel fitting 4 are closed and the pair of H-steel fittings 4 are closed. Side plate 5 adjustably fixed to plates 3, 3
And a permanent form 10 in contact with the surface of the H steel fitting 4 with a certain gap S therebetween, and a part arranged between the steel sheet pile 1 and the permanent form 10 and partially connected to the H steel fitting 4. Cover plate 12 for covering the gap S between the reinforcing steel 9 and the permanent molds 10, 10.
And a fastening member 8, 14 for fixing the boundary of each permanent form 10 between the H steel fitting 4 and the cover plate 12.