JP4926851B2 - Repair method of elevated floor slab - Google Patents

Description

  The present invention relates to a method for repairing an elevated floor slab, and more particularly, to a method for repairing an elevated floor slab that can reduce the work and reduce the number of work devices and materials.

  Reinforced concrete reinforced concrete slabs erected on water such as piers or beams installed between the columns deteriorate due to the influence of seawater, etc., and it is necessary to repair when the deterioration has progressed to some extent. . Similarly, reinforced concrete elevated slabs erected on land such as road bridges need to be repaired at the stage of deterioration.

  In general, when repairing a jetty, a work table ship is placed on the scaffold for work under the elevated floor slab of the jetty or under the elevated floor slab so that the worker can work upward. Noh is carrying out a series of repair work such as fishing work and concrete filling work. As described above, it is necessary to work with an unreasonable posture, which is a heavy labor and it is difficult to improve work efficiency.

Therefore, in order to solve such a problem, a method has been proposed in which the elevated floor slab is separated from the support column and the elevated floor slab moved to the work yard is turned upside down to repair the lower surface of the elevated floor slab ( Patent Document 1). However, additional work equipment and materials are required, such as moving the elevated floor slab to a work yard in another location, repairing it, and then performing the work of laying the elevated floor slab on the original column again. There was a problem.
Japanese Patent Laid-Open No. 2003-301212

  It is an object of the present invention to provide a method for repairing an elevated floor slab that can reduce the work and reduce the number of work devices and materials.

  In order to achieve the above object, a method for repairing an elevated floor slab according to the present invention is a method for repairing an elevated floor slab made of reinforced concrete installed on a column or a beam provided between columns. The repair target area of the plate is cut out from above, and the cut reinforced concrete body is removed to form an opening, and a pillow beam is hung from the upper support material installed above the opening to the position below the opening. Then, a scaffold is disposed on the pillow beam, and after the work of suspending the concrete at the peripheral edge of the opening of the opening by an operator on the scaffold, the scaffold is removed and suspended on the upper support material. The pillow beam is moved to a predetermined position below the reinforcing bar protruding from the peripheral edge of the opening by the concrete suspending operation, and a panel material is installed on the pillow beam and protrudes from the peripheral edge of the opening by the panel material. Rebar After covering the opening at one side, a new reinforcing bar is placed on the reinforcing bar protruding from the peripheral edge of the opening, and then concrete is placed in the opening to integrate with the panel material. The opening is closed with reinforced concrete.

  Further, another repair method for an elevated floor slab according to the present invention is a method for repairing an elevated floor slab made of reinforced concrete installed on a pillar or a beam provided between the pillars standing on the water or on the land. The repair target area is cut out from above, the opening is formed by removing the cut out reinforced concrete body, and a pillow beam is hung from the upper support material installed above the opening to the position below the opening. , Placing a scaffold on the pillow beam, and embedding new reinforcing bars so as to protrude into the peripheral edge of the opening after the roughening work of the concrete at the peripheral edge of the opening of the opening by an operator placed on the scaffold, Next, after removing the scaffold, the pillow beam suspended from the upper support member is moved to a predetermined position below the reinforcing bar protruding from the peripheral edge of the opening, and a panel material is installed on the pillow beam. Depending on the panel material After covering the opening at a position below the reinforcing bar arranged so as to protrude from the peripheral edge of the opening, a new reinforcing bar is arranged on the reinforcing bar protruding from the peripheral edge of the opening, and then concrete is applied to the opening. The opening is closed by reinforced concrete integrated with the panel material.

  In the present invention, as the panel material, a prestressed concrete panel material in which a PC steel wire is embedded can be used, and a fiber reinforced panel material in which fibers are mixed with cement can also be used. A panel material formed of high-strength fiber reinforced mortar using silica fume cement can also be used.

  In addition, when a panel material is installed on the pillow beam, a plurality of panel materials may be installed side by side, and a joint between adjacent panel materials may be filled with a water stop material.

  According to the present invention, the opening is formed by removing the reinforced concrete body in the repair target area of the elevated floor slab cut out from above, and the pillow beam is formed below the opening from the upper support material installed above the opening. Since the worker places the scaffold on the pillow beam, and the worker rests on the scaffold, the concrete hangs the concrete around the opening edge of the opening, or the roughing work and the reinforcing bar placement work. Work can be performed in a downward posture from the upper side of the opening, and lightening can be achieved.

  In addition, after the concrete suspension work or the roughing work and the reinforcing bar placement work, the scaffolding is removed, and the pillow beam suspended from the upper support material is replaced with the reinforcing bars protruding from the peripheral edge of the opening by the concrete suspension work, or After the concrete roughing work, move it to a predetermined position below the reinforcing bar that protrudes from the peripheral edge of the opening, install the panel material on the pillow beam, and cover the opening with the panel material, then open the opening Arrange the new reinforcing bar on the reinforcing bar that protrudes from the peripheral part or the new reinforcing bar that is embedded so that it protrudes, and then place concrete in the opening and close the opening with the reinforced concrete integrated with the panel material. Thus, since the panel material and the pillow beam which become a part of the elevated floor slab after repair are used as work materials, it is possible to reduce the materials to be used.

  In addition, since the work is performed at an existing location of the elevated floor slab to be repaired, a large-scale moving device for moving the elevated floor slab becomes unnecessary. Thereby, work can be performed with a small number of working devices.

Hereinafter, the repair method of the elevated floor slab of the present invention will be described based on the embodiment shown in the drawings.
In the present invention, as shown in FIGS. 1 and 2, the reinforced concrete elevated floor slab 1 erected on a column 4 standing on the water such as a pier or the beam 4 a provided between the columns 4. Elevated floor slab 1 made of reinforced concrete will be repaired. First, the upper support material 6 is installed on the H steel 10 placed on the elevated floor slab 1 with a space to be repaired across the repair target area. A lifting tool 11 made of a wire, a bolt, or the like connected to the upper support material 6 installed above the repair target area is fixed to the upper surface of the repair target area of the elevated floor slab 1. In this state, the repair target area of the elevated floor slab 1 is cut from above by a cutter device or the like. Since the reinforced concrete body 1a in the repair target area cut out in this way is held by the hanger 11, it does not fall.

  The cut-out reinforced concrete body 1a is lifted by a crane or the like and removed to another place. At this time, the connection between the reinforced concrete body 1a and the hanger 11 is released. By removing the reinforced concrete body 1 a, an opening 1 b is formed in the repair target area of the elevated floor slab 1. Removal can be facilitated by reducing the area of one reinforced concrete body 1a and dividing it into a plurality of parts.

  Next, the pillow beam 7 is inserted from above the opening 1b, and the pillow beam 7 is suspended at a position below the opening 1b by the suspension anchor 9 connected to the upper support member 6 as illustrated in FIGS. To do. A scaffold 8 inserted from above the opening 1b is placed on the pillow beam 7 suspended in this manner. The scaffold 8 is composed of, for example, a prismatic material 8a installed on the pillow beam 7 and an expanded metal plate 8b placed on the prismatic material 8a.

  Next, as illustrated in FIGS. 5 and 6, the worker P on the scaffold 8 performs the suspension work of the concrete 2 on the peripheral edge of the opening 1 b. At this time, the worker P is in a state of standing through the opening 1b. Therefore, the concrete 2 can be suspended in an easy posture without becoming a tight upward posture. By adjusting the length of the suspension anchor 9, the vertical position of the pillow beam 7 (scaffold 8) is set so that the operator P can easily work.

  Next, the opening 8 is inserted and removed by lifting the scaffold 8 or the like. As illustrated in FIG. 7, when the concrete 2 is hung, a large number of reinforcing bars 3 protrude from the peripheral edge of the opening 1 b to the inner peripheral side.

  Next, as illustrated in FIGS. 8 and 9, the upper support material 6 suspending the pillow beam 7 is moved horizontally to move the pillow beam 7 to a predetermined horizontal position. Further, the pillow beam 7 moved to a predetermined horizontal position is moved to a predetermined vertical position at a position below the protruding reinforcing bar 3 by adjusting the length of the suspension anchor 9. For example, the pillow beam 7 is moved upward so as to approach the protruding rebar 3. In this way, the pillow beam 7 is moved to predetermined positions in the horizontal direction and the vertical direction.

  Next, the panel member 5 is inserted from above the opening 1b and is laid on the pillow beam 7 as illustrated in FIGS. The panel material 5 is disposed between the pillow beam 7 and the protruding reinforcing bar 3 in the vertical direction. In this way, by laying the panel material 5 on the pillow beam 7, the opening 1 b is covered with the panel material 5 in the horizontal direction.

  The panel material 5 is preferably lightweight and high-strength, for example, a prestressed concrete panel material in which a PC steel wire is embedded, or fiber reinforcement formed by mixing fibers of steel, vinylon, polypropylene, aramid, etc. into cement. Panel material can be used. A panel material in which a PC steel wire is embedded in the fiber-reinforced panel material and prestressed can be used. The steel fibers to be blended in the fiber reinforced panel material have, for example, an outer diameter of about 0.1 to 0.2 mm and a length of about 10 mm to 30 mm.

  Moreover, the panel material 5 can also be formed with the high intensity | strength fiber reinforcement mortar which mix | blended said various fiber and used the silica fume cement. When the panel material 5 formed of this high-strength fiber reinforced mortar is used, the salt penetration resistance is improved due to the formation of a dense hardened body structure, and the so-called fogging can be reduced accordingly.

  If the area of one panel material 5 is reduced, it can be easily inserted from above the opening 1b and can be easily installed on the pillow beam 7. Thus, when the area of the one panel material 5 is made small, it installs in the pillow beam 7 so that the several panel material 5 may be arranged in order. And the seam between the panel members 5 installed adjacent to each other is filled with a water stop material. Similarly, the seam between the panel material 5 and the concrete at the periphery of the opening of the opening 1b is filled with a water stop material.

  When filling joints such as between the panel members 5 with a water-stopping material, various water-stopping materials can be used. For example, the titanium sheet is installed in a state where the titanium sheet is slackened downward, and then the non-shrinkable grout material is filled on the slackened titanium sheet so as to fill the gap. By using such a water stop material, it becomes possible to stop the water with good durability.

  After the panel material 5 is installed on the pillow beam 7, as illustrated in FIG. 12, a new reinforcing bar 3 b is connected to the reinforcing bar 3 protruding from the opening 1 b and the bars are arranged in a lattice shape.

  Next, a new concrete 2a is placed in the opening 1b arranged in a lattice pattern by the new reinforcing bar 3b. As a result, as illustrated in FIGS. 13 and 14, the new concrete 2 a and the reinforcing bars 3 and 3 b arranged in a lattice form are integrated into a reinforced concrete, and the opening 1 b is closed together with the panel material 5. The panel material 5 used as a part of the formwork of the new concrete 2a becomes a part (reinforcement material) of the elevated floor slab 1 after repair as it is. Further, the pillow beam 7 used as a work material when the scaffold 8 and the panel material 5 are arranged also becomes a part (reinforcing material) of the elevated floor slab 1 after repair as it is.

  Next, the suspension anchor 9 is pulled out from the newly placed concrete 2a, and the upper support material 6 is also removed. By pulling out the suspension anchor 9, a hole generated in the new concrete 2 a is filled with a grout material. Thus, as illustrated in FIGS. 15 and 16, the repaired area of the deteriorated elevated floor slab 1 has been repaired.

  As described above, according to the repairing method of the present invention, a series of repairing work including the concrete 2 lifting work can be performed from above the position of the elevated floor slab 1, and the conventional repairing method can be performed. Compared with, it can be lightened.

  Further, since the panel material 5 and the pillow beam 7 are used as work materials, the work materials can be reduced. Furthermore, since the work is performed at the existing location of the elevated floor slab 1 to be repaired, a large moving device for moving the elevated floor slab 1 or the like is not required, and the work can be performed with a small number of work devices. .

  Further, as another repair method of the elevated floor slab of the present invention, instead of the concrete 2 suspension work illustrated in FIG. 6, as illustrated in FIG. The concrete is roughened on the peripheral edge of the opening, and then a new reinforcing bar 3a is embedded by a chemical anchor or the like so as to protrude into the peripheral edge of the opening. The roughing operation is for improving the bondability with the newly placed concrete 2a.

  Next, the scaffold 8 is lifted and the opening 1b is inserted and removed. As illustrated in FIG. 18, by performing roughing work on the concrete 2 and embedding new reinforcing bars 3 a, a large number of reinforcing bars 3 a protrude from the opening peripheral edge of the opening 1 b toward the inner peripheral side.

  Next, as in the examples of FIGS. 8 and 9, the pillow beam 7 suspended from the upper support member 6 is moved to a predetermined position below the reinforcing bar 3 a protruding and arranged.

  Next, in the same manner as illustrated in FIGS. 10 and 11, the panel material is inserted from above the opening 1b so as to be installed on the pillow beam 7 and disposed between the pillow beam 7 and the reinforcing bar 3a so as to close the opening 1b. To.

  Next, similarly to the illustration of FIG. 12, a new reinforcing bar 3b is connected to the reinforcing bar 3a embedded so as to protrude to the peripheral edge of the opening, and the bars are arranged in a lattice pattern. The subsequent steps are the same as in the previous embodiment, and the new concrete 2a and the reinforcing bars 3a and 3b arranged in a lattice form are integrated into a reinforced concrete, which closes the opening 1b together with the panel material 5. .

  According to this method, there is an advantage that it is not necessary to carry out the lifting work of the concrete 2 so as to expose the embedded reinforcing bars 3, and the roughing work (light lifting work) is sufficient.

  The present invention is not limited to the pillar 4 standing on the water such as a pier or the elevated floor slab 1 installed on the beam provided between the pillars 4 but also the pillar 4 standing on the land such as a road bridge or a railway bridge. Alternatively, the present invention can be applied to repair of the elevated floor slab 1 installed on the beam provided between the columns 4.

It is a top view explaining the first process of the repair method of an elevated floor slab of the present invention. It is a side view of FIG. It is a top view explaining the next process of FIG. FIG. 4 is a side view of FIG. 3. FIG. 4 is a plan view for explaining a next step of FIG. 3. FIG. 6 is a side view of FIG. 5. FIG. 6 is a plan view for explaining the next step of FIG. 5. FIG. 8 is a plan view for explaining a step subsequent to FIG. 7. It is a side view of FIG. FIG. 9 is a plan view for explaining a step subsequent to FIG. 8. It is a side view of FIG. It is a top view explaining the next process of FIG. FIG. 13 is a plan view for explaining a step subsequent to FIG. 12. FIG. 14 is a side view of FIG. 13. It is a top view which illustrates the elevated floor slab after repair. FIG. 16 is a side view of FIG. 15. It is a side view explaining another process replaced with the process illustrated in FIG. FIG. 18 is a plan view illustrating a process subsequent to FIG. 17.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor slab 1a Reinforced concrete body 1b Opening 2 Concrete 2a New concrete 3, 3a, 3b Reinforcement 4 Post 4a Beam 5 Panel material 6 Upper support material 7 Pillow beam 8 Scaffold 8a Square column material 8b Expanded metal plate 9 Suspension anchor 10 H steel 11 Hanging tool P Worker

Claims (6)

  In the repair method of the elevated floor slab made of reinforced concrete erected on the pillars standing on the water or on the land or between the columns, the repair target area of the elevated floor slab is cut out from above, and the cut reinforced concrete body is An opening is formed by removing, a pillow beam is suspended from the upper support material laid above the opening, and a scaffold is disposed on the pillow beam. After the concrete was lifted by the worker on the periphery of the opening of the opening, the scaffold was removed, and the pillow beam suspended on the upper support material was projected from the periphery of the opening by the lifting of the concrete. After moving to a predetermined position below the reinforcing bar, laying a panel material on the pillow beam, and covering the opening at a position below the reinforcing bar protruding from the peripheral edge of the opening with the panel material, the opening Margin And Haisuji new rebar protruding rebar from, then Da設 concrete in the opening method of repairing elevated deck which is adapted to close the opening by reinforced concrete integrated with the panel material.   In the repair method of the elevated floor slab made of reinforced concrete erected on the column or the beam provided between the columns on the water or on land, the repair target area of the elevated floor slab is cut out from above, and the cut reinforced concrete body is An opening is formed by removing, a pillow beam is suspended from the upper support material laid above the opening, and a scaffold is disposed on the pillow beam. After the roughing work of the concrete at the peripheral edge of the opening of the opening by the worker who is placed, a new reinforcing bar is embedded to protrude into the peripheral edge of the opening, and then the scaffold is removed, and then suspended on the upper support material. The pillow beam is moved to a predetermined position below the reinforcing bar that protrudes from the peripheral edge of the opening, and a panel material is installed on the pillow beam, and is arranged to protrude from the peripheral edge of the opening by the panel material. iron After covering the opening at a lower position, a new reinforcing bar is placed on the reinforcing bar that protrudes from the peripheral edge of the opening, and then concrete is placed in the opening to integrate with the panel material. Repair method for elevated floor slabs where the openings are closed with reinforced concrete.   The method for repairing an elevated floor slab according to claim 1, wherein the panel material is a prestressed concrete panel material in which a PC steel wire is embedded.   The method for repairing an elevated floor slab according to any one of claims 1 to 3, wherein the panel material is a fiber reinforced panel material in which fibers are mixed with cement.   The method for repairing an elevated floor slab according to claim 4, wherein the panel material is a panel material formed of high-strength fiber reinforced mortar using silica fume cement.   The elevated structure according to any one of claims 1 to 5, wherein when the panel material is installed on the pillow beam, a plurality of panel materials are arranged side by side, and a seam between adjacent panel materials is filled with a water-stop material. How to repair floor slabs.

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