JPH0213557Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a formwork for corrosion protection of steel sheet pile walls, which is adopted when carrying out anticorrosion construction on the sea side of steel sheet pile walls using steel pipe sheet piles, U-shaped steel sheet piles, etc. It concerns the support structure.

[Prior art]

Conventionally, the formwork support structure for steel sheet pile wall corrosion protection is as follows:
As disclosed in Japanese Patent Publication No. 59-53968, a vertically extending pipe-shaped guide member with a partially cut-out circular cross section is fixed to the joint of the steel pipe sheet pile wall by welding, and the flange and the flange are The bulge part of the fixture, which consists of a continuous web in the center and a bulge part provided at the free end of the web, is fitted into the guide member, and a groove is formed on the back side of the flange of the fixture. It is known that the edge plate of a formwork with a shaped cross section and a band-shaped holding member are arranged one on top of the other, and the flanges, edge plate, and band-shaped holding member are fastened together by bolts inserted across them.

However, in the case of this formwork support structure, it is necessary to insert the bolt from the front side of the flange and screw it into the nut on the back side of the band-shaped holding member, but if the formwork is long, the steel sheet pile wall and the formwork must be screwed together. Therefore, the nut is inserted between the steel sheet pile wall and the formwork using a special holder, and the nut is positioned opposite the bolt hole. Since it is necessary to hold the bolt in place and screw the bolt into the nut in this state, it is difficult to attach the formwork. Furthermore, when constructing a steel pipe sheet pile wall, it is difficult to place adjacent steel pipe sheet piles completely parallel to each other. If one joint is tilted relative to the other, it will be difficult to weld the pipe-shaped guide member to the joint, and the pipe-shaped guide member will be installed at an angle. There is. If the other pipe-shaped guide member is inclined with respect to one of the adjacent pipe-shaped guide members, it becomes difficult to attach the formwork.

[Purpose of the invention, structure]

The purpose of this invention is to provide a formwork support structure for steel sheet pile wall corrosion protection that can advantageously solve the above-mentioned problems. A large number of formwork support members 1 each having a groove-shaped cross section are opened toward the
The above-mentioned bolts are placed at intervals in the longitudinal direction of the steel sheet pile wall 2 on the sea side of the steel sheet pile wall 2, and are fixed to the steel sheet pile wall 2 at intermediate portions of the plurality of support bolts 3 arranged at intervals in the vertical direction and fixed to the steel sheet pile wall 2. The widthwise central part of the formwork support member 1 is fitted and locked, and the formwork body 4 has a groove-shaped cross section that extends in the vertical direction and opens toward the land side. A large number of formworks 6 consisting of mounting flanges 5 connected to the outside are arranged at intervals in the longitudinal direction of the steel sheet pile wall, and the opening edge of the formwork body 4 is connected to the formwork support member 1. A tightening plate 7 is supported by the sides in the width direction of the groove bottom plate and is disposed across the front surfaces of the mounting flanges 5 in adjacent formworks 6, and the support bolts 3 are passed between each formwork 6 and tightened. Corrosion protection for steel sheet pile walls, characterized in that the opening edge of the formwork body 4 is fastened to the formwork support member 1 via the clamping plate 7 by means of support bolts 3 inserted into the attached plate 7. In the formwork support structure.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

Figures 1 to 7 show a formwork support structure for steel sheet pile wall corrosion protection according to an embodiment of this invention using the formwork shown in Figures 8 and 9. Slightly below the corroded part on the sea side of the steel sheet pile wall 2 using the sheet pile 8, the steel sheet pile wall 2
The base end of a bracket 9 made of cut T-shaped steel having a horizontal flange is fixed by welding to each concave part on the sea side and each convex part on the sea side, and the tip part of the bracket 9 has a web and a flange. A mounting screw 10 is fixed by welding at the corner of the support bracket 12, and a nut 11 is fixed to the upper part by welding. A bottom formwork 14 made of fiber cementitious material, secured by nuts 13 and having an uneven rear surface adapted to the seaward uneven surface of the steel sheet pile wall 2, rests over the flange of the bracket 9.

Notches 15 are provided at the top of the uneven rear surface and both left and right end surfaces of the bottom formwork 14.
A water-absorbing and swelling water-stop material 16 is attached to the rear surface of the uneven surface and both left and right end surfaces, and a holding metal fitting 17 for preventing the bottom formwork 14 from lifting due to water pressure is welded to the steel sheet pile wall 2. A washer 19 is interposed between the bolt 18 screwed into the nut 11 and the front surface of the bottom formwork 14, and the bolt 18 presses the bottom formwork 14 toward the steel sheet pile wall 2. At the same time, the water absorbing and swelling water stop material 16 is pressed against the steel sheet pile wall 2. Further, the ends of the bottom forms 14 adjacent in the left and right direction are placed on the flanges of the common bracket 9, and the water-absorbing and swelling waterproof materials 16 at the ends of the adjacent bottom forms 14 are joined to each other. .

A large number of steel rods 20 each having a locking flange at the front end and having a screw hole at the front are arranged at intervals in the vertical direction above the bracket 9, and in the front-back direction (direction perpendicular to the steel sheet pile wall). The rear end of each steel rod 20 is fixed to the steel sheet pile wall 2 by welding,
Further, a shallow recess 21 is provided in the upper surface of the bottom mold 14 in the area where the mold is to be placed, and a lower part of a water-absorbing and swelling water stop material 22 having an L-shaped cross section is fitted into the recess 21 and attached thereto.

Steel formwork support member 1 with a U-shaped groove-shaped cross section that extends in the vertical direction and opens toward the sea side.
is disposed in the recess on the sea side in the steel sheet pile wall 2, and the widthwise central portion of the groove bottom plate 23 of the formwork support member 1 is in contact with the front surface of the steel rod 20, and the screw rod 24 is The rear part is inserted into the through hole of the groove bottom plate 23 and screwed to the steel rod 20, and furthermore, a sealing rubber packing 25 and a presser washer 26 are sequentially fitted to the screw rod 24, and an intermediate nut 27 is screwed. The intermediate nut 27 connects the presser washer 2.
6, the rubber packing 25 is pressed against the periphery of the hole in the groove bottom plate 23.

A mounting flange 5 having a vertical support surface 28 and a mounting flange 5 having a vertical support surface 28 are installed on the outside of the opening in the form body 4 having a semicircular groove cross section extending vertically and opening toward the land side. The arranged reinforcing ribs 29 are integrally provided to constitute a formwork 6, the formwork 6 is made of a fiber-mixed cement material, and the flange 5 has a recess 30 for placing the screw rod 24. They are provided at intervals in the vertical direction.

The formwork 6 is arranged so as to cover the protrusion on the sea side of the steel sheet pile wall 2, and the opening edge of the formwork body 4 is located on the side in the width direction of the groove bottom plate 23 of the formwork support member 1. A water-absorbing and swelling water stop material 31 is interposed between the opening edge and the groove bottom plate 22, and the formwork 6
The lower end portion of is placed on the water-absorbing and swelling water-stopping material 22 .

A clamping plate 7 made of a steel plate is arranged across the vertical support surfaces 28 of the mounting flanges 5 of adjacent formworks 6, and the screw rod 24 is inserted through the clamping plate 7 and screwed into the screw rod 24. The mounting flanges 5 of the adjacent formworks 6 are pressed by the nuts 32 via the tightening plate 7 , and the opening edge of the formwork body 4 is attached to the groove bottom plate 23 via the water-absorbing and swelling water-stopping material 31 .
The steel rod 20, the screw rod 24,
The support bolt 3 is composed of the intermediate nut 27, the nut 32, and the like. The screw rod 24, presser washer 26, intermediate nut 27, and nut 32 are preferably made of a corrosion-resistant metal material or a corrosion-resistant metal material such as stainless steel.

In order to divide and fill the anti-corrosion curable filler into appropriate longitudinal ranges of the steel sheet pile wall 2, the partition plates 33 are fixed in advance to the formwork support member 1 at appropriate positions by means such as welding. Moreover, a water-absorbing and swelling waterproof material 34 is interposed between the partition plate 33 and the steel sheet pile wall 2.

After the formwork 6 and the bottom formwork 14 are set in this way, the water between the steel sheet pile wall 2 and each formwork 6 is pumped up and discharged by a pump or the like to create a space, and then the space is is filled with a hardening filler 35 for anticorrosion such as concrete, and the formwork 6 is used as both a formwork and an anticorrosive material.

When the water between the steel sheet pile wall 2 and the formwork 6 is discharged, the water pressure acting on the formwork 6 is strongly supported by the formwork support member 1. Further, by placing a reinforcing material such as a reinforcing reinforcing bar between the steel sheet pile wall 2 and the formwork 6 and filling it with anti-corrosion curable filler 35, the steel sheet pile wall 2 can be reinforced against corrosion.

When implementing this invention, the formwork 6 may have a trapezoidal groove cross section, and the hardening filler 35 may be made of ordinary concrete, cement mortar, resin mortar, polymer cement, or steel fiber. Mixed mortar, steel fiber mixed concrete, etc. can be used. Examples of the above-mentioned water-absorbing and swelling water-stopping materials include urethane-based water-absorbing and swelling material Chemigard (trade name, manufactured by Sanyo Kasei KK), vinyl acetate-based water-absorbing and swelling material (trade name: Pilelock, manufactured by Nippon Kagaku Painting Co., Ltd.), etc. can be used.
Furthermore, the water-absorbing and swelling water-blocking material may be attached or applied to closed-cell urethane foam or any other foamed synthetic resin sponge.

The support bolt 3 may have any structure other than that shown in the drawings. In addition, the formwork 6, 14
The material may be made of steel, anti-corrosion steel plate, synthetic resin, or fiber-containing synthetic resin, or a heavy anti-corrosion coating such as polyethylene, polyurethane, or ultra-thick epoxy resin may be used on the outside of the steel plate. You may use the one you made.

Packing may be interposed between the mounting flanges 5 of adjacent formworks 6, and a curable filler for water stopping may be injected and filled into the gap between the formwork support member 1 and each flange 5.

The support bolt 3 can be fixed to the steel sheet pile wall 2 by means other than stud welding, such as driving a threaded drive pin into the steel sheet pile wall 2 and screwing one side of the sleeve nut into the thread of the threaded drive pin. It is also possible to employ means for threadingly connecting one end of the support bolt to the other side of the sleeve nut, or any other mechanical fixing means.

As the material constituting the formwork support member 1, fiber-containing cement material, synthetic resin, or anti-corrosion steel plate may be used, and in place of the sealing rubber packing 25, a sealing material of any other material may be used. Good too. Furthermore, the partition plate 33 may be fixed to the formwork support member 1 with adhesive or bolts instead of being fixed by welding.

[Effect of idea]

According to this invention, a large number of formwork support members 1 having a groove-shaped cross section are arranged at intervals in the longitudinal direction of the steel sheet pile wall 2 on the sea side of the steel sheet pile wall 2, and are arranged at intervals in the vertical direction, The center portion of the formwork support member 1 in the width direction is fitted into the middle portion of a plurality of support bolts 3 fixed to the sheet pile wall 2, and a large number of formworks 6 having a groove-shaped cross section are inserted into the middle portions of the plurality of support bolts 3 fixed to the sheet pile wall 2. The opening edge of the formwork main body 4 in the formwork 6 is supported by the widthwise side of the groove bottom plate in the formwork support member 1, and A support bolt 3 is inserted through a clamping plate 7 arranged across the flange 5, and the opening edge of the formwork body 4 is supported by the support bolt 3 via the clamping plate 7 and the mounting flange 5. Since the formwork 6 is tightened and fixed to the member 1, the formwork 6 can be easily tightened and fixed at a predetermined position on the steel sheet pile wall 2 with a predetermined interval by a simple means, and the formwork 6 can be tightened and fixed with the support bolts 3. By strongly pressing the mounting flange 5 toward the formwork support member 1 via the attached plate 7, the formwork 6 can be strongly tightened and fixed in a stable state, and moreover, with only one support bolt 3. Adjacent left and right formwork 6
Since the ends of the formwork can be fixed, the structure is simple and the formwork installation work can be done quickly. As a result, effects such as easy positioning of the formwork 6 in the left-right direction can be obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a cross-sectional plan view of a formwork support structure for anticorrosion of steel sheet pile walls, Fig. 2 is a front view thereof, and Fig. 3 is A of Fig. 2. - An enlarged cross-sectional view along line A, FIG. 4 is an enlarged cross-sectional plan view of the formwork support, and FIG. 5 is an enlarged front view of the formwork support.
Figure 6 is a vertical sectional side view showing the bottom formwork support part;
The figure is its front view. Figure 8 is a front view of the formwork;
FIG. 9 is a sectional view taken along the line B--B in FIG. 8. In the figure, 1 is a formwork support member, 2 is a steel sheet pile wall, 3 is a support bolt, 4 is a formwork body, 5 is a mounting flange, 6 is a formwork, 7 is a clamping plate, and 8 is a U-shaped steel sheet pile. , 9 is a bracket, 12 is a support metal fitting, 14 is a bottom formwork, 16 is a water-absorbing and swelling water-stopping material, 18 is a bolt, 20 is a steel rod, 22 is a water-absorbing and swelling water-stopping material,
23 is a grooved bottom plate, 24 is a screw rod, 25 is a rubber packing for sealing, 26 is a presser washer, 27 is an intermediate nut, 28 is a vertical support surface, 31 is a water absorbing and swelling waterproof material, 32 is a nut, and 35 is a hardening material for corrosion prevention. It is a filling material.

Claims (1)

[Scope of utility model registration request] A large number of formwork support members 1 each having a groove-shaped cross section extending in the vertical direction and opening toward the sea side are arranged at intervals in the longitudinal direction of the steel sheet pile wall on the sea side of the steel sheet pile wall 2. The center portion in the width direction of the formwork support member 1 is fitted and locked in the middle portion of a plurality of support bolts 3 fixed to the steel sheet pile wall 2 at intervals in the direction, and extends in the vertical direction. The formwork body 4 has a groove-shaped cross section and is open toward the land side.
A large number of formworks 6 are arranged at intervals in the longitudinal direction of the steel sheet pile wall, and include mounting flanges 5 connected to the outside of the opening of the formwork main body 4. The edges are supported by the sides in the width direction of the groove bottom plate of the formwork support member 1, and a tightening plate 7 is disposed across the front surface of the mounting flange 5 of the adjacent formwork 6, and the support bolt 3 is A clamping plate 7 is inserted between each formwork 6, and the opening edge of the formwork body 4 is tightened and fixed to the formwork support member 1 via the clamping plate 7 by the support bolt 3 thereof. A formwork support structure for corrosion protection of steel sheet pile walls.