JP3554955B2 - Permanent formwork mounting structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mounting structure for preventing and reinforcing a harbor structure such as a steel pipe sheet pile using a permanent formwork.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a countermeasure against corrosion of steel sheet piles, it is common to attach a semicircular or irregular FRP cover along the shape of the sheet pile to the sea side of the steel pipe with metal fittings, fill the cover with mortar, and solidify. However, an actual steel pipe 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 pipe 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 concrete formwork, or two layers of FRP and concrete are prepared in advance, and a large number of parts are formed between the formwork and the structure. Permanent forms for placing rebar have also appeared.
[0004]
On the other hand, as a means for attaching the flat cover to a steel sheet pile or a steel pipe sheet pile, first, a plurality of studs or brackets are welded to the front of the steel sheet pile as in JP-A-60-159061, and after attaching the cover to this, There is a method of tightening with a nut from the outside. Secondly, there is a method in which a vertically long T-shaped bracket or hook is welded to a steel sheet pile as described in Japanese Patent Application Laid-Open No. 57-137529, and a concrete form is dropped into the T-shaped bracket from above and fixed. However, a flat cover or a mold frame has a larger mortar pressure than a concave-convex cover, so that the mortar pressure is large, and the resin cover is deformed, and the hook portion has a drawback in that a hooked portion comes off. In addition, when a cover or a formwork is attached to a steel sheet pile that has been distorted or tilted back and forth and left and right in the above-described manner, the formwork itself remains inclined.
[0005]
On the other hand, in the case of steel pipe sheet piles, as shown in FIG. 5, a nail metal 4a is welded to the outer surface of the steel pipe 1a, and a T steel or H steel metal fitting 7 is attached to a reinforcing bar 8 arranged inside the permanent formwork 10, and the metal fitting 7 is formed. The inner end is dropped into the nail fitting 4a. The corner of the steel pipe sheet pile 1 is cut off a part of the steel pipe 1a in consideration of the collision of driftwood or a ship, and uses a curved permanent mold 10. In this case, the claw fitting 4a is provided on the rebar side, and the steel pipe side is provided. Is provided with a latch 4b. Further, the steel pipe sheet piles 1 connected by the joints are not actually aligned in a straight line as shown in the drawing, but rather are inclined here and there, and the metal fitting 7 at the end of the formwork 10 is normal to the steel pipe 1a. (Center line extension) does not correspond. Therefore, at present, the arm 12 is temporarily welded to the steel pipe 1a at the site, and the claw fitting 4a is fixed to a position of the arm 12 facing the fitting.
[0006]
[Problems to be solved by the invention]
For this reason, Japanese Patent Application Laid-Open Nos. 9-177109 and 279568 propose a structure in which a permanent form can be vertically attached to an inclined steel sheet pile by adjusting a pair of plates and metal fittings. However, since the steel sheet pile is flat, the plate may be welded at a right angle. However, since the steel pipe sheet pile has a curved surface, the permanent formwork cannot be parallel to the steel pipe sheet pile unless the plate is welded symmetrically with respect to the normal. In particular, as can be seen from the arm 12 and the corners of the steel sheet pile in FIG. 5, it is inefficient to process and manufacture the metal fittings on site according to the welding location in terms of labor and cost.
[0007]
The present invention has been made in view of such circumstances, and an object thereof is to be able to install a formwork vertically and parallel to an inclined or distorted steel pipe sheet pile, and to easily cope with various mounting locations of metal fittings, Another object of the present invention is to provide a permanent form mounting structure having sufficient strength.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the mounting structure of the present invention includes a bottom plate fixed to the undersea portion of a steel pipe sheet pile, a pair of plates fixed to the front surface of a predetermined number of steel pipes, and a cross section having a substantially box shape and an opening at the front surface. A vertically elongated claw fitting which is fitted into the plate and has a portion, a reinforcing bar connected to the inside of the permanent form via a fastening member, and a locking fitting fixed to the inside of the reinforcing bar, The inner end portion of the locking fitting is dropped from above along the opening of the claw fitting.
[0009]
First, a bottom plate for supporting the formwork is welded to the undersea portion of the steel pipe sheet pile, and then, a plurality of pairs of plates are vertically fixed to the outer surface of the steel pipe by correcting lateral displacement while comparing the vertical direction. In this case, if the fixed position of the plate deviates from the normal line of the steel pipe, the length of the left and right plates may be changed. Next, a claw fitting is fitted between the plates, and fixed to the plate after correcting the displacement in the front-rear direction. Subsequently, while hanging the permanent form to which the fitting and the reinforcing bar are attached in advance with a crane or the like, drop the inner end of the fitting into the claw fitting from above, and the form is arranged parallel to the steel pipe sheet pile. .
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 and 2 are a plan view and a side view, respectively, of a mounting structure for a permanent form to which the present invention is applied. A bottom plate 2 (FIG. 2) for supporting a form is welded below a steel sheet pile 1. In the example, mounting brackets for the formwork are installed at every third steel pipe 1a.
[0011]
On the front surface of the steel pipe 1a, a plurality of pairs of plates 3 are welded in the vertical direction symmetrically with respect to the normal line, and a vertically long claw fitting 4 is fitted between the plates 3. As shown in FIG. 2, the claw fitting 4 is formed by connecting U-shaped steel members to each other and connecting a plurality of rear portions with a back plate 5. The front opening 6 extends downward, and the cross section is substantially a box. It has a shape.
[0012]
An inner end of an H steel fitting 7 is engaged with the opening 6 of the claw fitting 4, and an outer end of the fitting 7 is welded to a reinforcing bar 8 in advance. The reinforcing bars 8 are formed by assembling L-shaped steels in a lattice shape, and play a role of reinforcement by integrating with mortar to be filled later. A permanent form 10 is attached to the outside of the reinforcing bar 8 via a tie bar 9. The permanent form 10 has a double structure of an outer layer of FRP and an inner layer of concrete, and an end of a tie bar 9 is fixed to the concrete layer in an anchor state. It is desirable that the H-steel fitting 7, the reinforcing bar 8, the tie bar 9 and the permanent formwork 10 are integrally formed in a factory beforehand, so that the nut 11 of the tie bar 9 can be completely fixed at the site.
[0013]
Next, the order of mounting the permanent formwork 10 will be described. First, the bottom plate 2 is welded to the underwater portion of the steel pipe sheet pile 1 and the pair of plates 3 and 3 are vertically symmetrical with the normal line of the steel pipe 1a using a vertical jig or a gauge. Weld multiple sets vertically. This corrects the lateral displacement among the distortion and inclination of the steel pipe 1a when the formwork is attached.
[0014]
Next, the claw fitting 4 is fitted between the plates 3 and 3, and the side surface is welded to the plate 3 while adjusting in the front-back direction. The plate 3 is vertically fixed along the upper and lower sides of the steel pipe 1a, but can be corrected only at the time of mounting, when the steel pipe itself is inclined forward and backward, and it is difficult to correct the plate 3 alone. Therefore, by changing the fixing position of the side surface of the claw fitting 4 and performing welding, the inclination before and after can be corrected.
[0015]
Next, while hanging the formwork 10 integrated with the reinforcing bar 8 with a crane or a rope (not shown) in a balanced manner, the inner end of the H steel fitting 7 is fitted into the claw fitting 4 and the formwork 10 is slowly lowered. The web portion of the metal fitting 7 descends along the opening 6 of the claw metal fitting. Since this is a new construction, there is no bulk concrete above the steel pipe sheet pile 1, so that the H steel bracket can be easily dropped from above. When the H steel fitting 7 hits the bottom plate 2 and stops, if the nut 11 of the tie bar 9 is tightened, the rebar 8 and the permanent form 10 are positioned and fixed. Depending on the situation at the site, the rebar 8 may be dropped first, the metal fittings 7 may be engaged with the claw metal fittings 4, and the formwork 10 may be fixed from outside.
[0016]
Next, when the H steel fitting 7 at the end of the permanent form 10 does not come on the normal line of the steel pipe 1a, it is only necessary to change the length of the left and right plutos 3a, 3b as shown in FIG. In the conventional structure shown in FIG. 5, the arm 12 is manufactured and processed on site, but in the present case, it can be dealt with only by shortening the plate 3a, and when the deviation from the normal is small, a plate of the same length is used. But there is no problem. As shown in FIGS. 4 and 5, the corners of the steel sheet pile 1 can be directly attached with the plates 3, 3 and the claw metal fittings 4 on the remaining concave surface of the steel pipe, and no special processing is required.
[0017]
When the mounting of each mold 10 is completed, a space between the steel sheet pile 1 and the mold 10 is filled with mortar (not shown). Since the claw fitting 4 has a substantially box shape and a double side surface, the claw fitting 4 can sufficiently withstand the mold frame 10 being pulled outward by the expansion pressure of the mortar. In addition, the mortar is integrated with the plates 3 and 3, the H steel fittings 7, the reinforcing bars 8, the tie bars 9, and the concrete layer inside the formwork. There is no.
[0018]
【The invention's effect】
As described in detail above, according to the permanent form-mounting structure of the present invention, the formwork can be installed vertically and parallel by adjusting the metal fittings even if the steel pipe sheet pile is inclined, and the metal fittings mounting portion can be curved, concave, There is an effect that it can easily cope with a deviation from the line.
[Brief description of the drawings]
FIG. 1 is a plan view of a form mounting structure.
FIG. 2 is a side view of a nail fitting.
FIG. 3 is a mounting state diagram when it deviates from a normal line.
FIG. 4 is an attached state diagram of a steel pipe sheet pile corner portion.
FIG. 5 is an overall plan view of a conventional mounting structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel sheet pile 1a Steel pipe 2 Bottom plate 3 Plate 4 Claw fitting 6 Opening 7 H steel fitting 8 Reinforcing bar 9 Tie bar 10 Permanent formwork 11 Nut

Claims (1)

A bottom plate 2 fixed to an underwater portion of a steel pipe sheet pile 1, a pair of plates 3 and 3 fixed to a front surface of a predetermined number of steel pipes 1a, and a plate 3 having a substantially box-shaped cross section and an opening 6 in the front surface; , 3, a reinforcer 8 connected to the inside of a permanent form 10 via fastening members 9, 11, and a locking member 7 fixed on the inside of the rebar 8. That the inner end portion of the locking metal fitting 7 is dropped from above along the opening 6 of the claw metal fitting 4,
Mounting structure of permanent formwork characterized by the following.

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