JP5819263B2 - High-strength concrete plate for reinforcement of existing slabs - Google Patents

Description

  The present invention relates to a high-strength concrete plate used for reinforcing an existing slab, and more particularly to a high-strength concrete plate for reinforcing an existing slab using a high-strength concrete material such as fiber-reinforced concrete or resin concrete.

  Conventionally, as a repair reinforcement structure and a repair reinforcement construction method for a wall body of an existing structure, there is one disclosed in Patent Document 1 below. Moreover, there exist some which are disclosed by the following nonpatent literatures 1 and 2 as the cement board in the construction. This method was constructed with a large scaffold.

  In addition, many repair / reinforcement methods for existing slabs in which steel materials are corroded have been proposed. For example, a cross-section repair method, a method using a mold, and a method using spraying can be mentioned.

JP 2010-121360 A Japanese Patent No. 3855511

Japan Society of Civil Engineers 61st Annual Lecture (September 2006), pp. 673-674 Civil Engineering Society 64th Annual Lecture (September 2009), pp. 1173-1174

  However, the above-described conventional repair and reinforcement methods for existing slabs have the following problems.

  First, as a problem related to the workability of these construction methods, the construction method using a formwork generally requires that a total scaffold be assembled under the slab. In the construction method by spraying, materials may be scattered.

  In addition, as a problem related to the durability of these construction methods, since deterioration factors such as salt and moisture cannot be blocked, there is a possibility that macrocell corrosion may occur at the repaired part or at the unrepaired part adjacent to the repaired part. The possibility of re-degradation cannot be denied.

  Thus, there has been no construction method with excellent durability that does not require a total scaffold and can be used to manually reinforce an existing slab that has been deformed. Also, depending on the repair / reinforcement method, there are cases where re-deformation occurs, and it was necessary to develop a permanent reinforcement method with excellent workability and durability.

  An object of this invention is to provide the high-strength concrete board for reinforcement of the existing slab which is lightweight and is excellent in workability and durability in view of the above situation.

In order to achieve the above object, the present invention provides
[1] A high-strength concrete plate that is integrally formed as a high-strength concrete plate for reinforcement of an existing slab and is bonded to a rectangular or square high-strength concrete plate. A high-strength concrete panel can be constructed by placing the adjacent high-strength concrete plates in parallel under a slab and connecting and fixing the adjacent high-strength concrete plates to each other with a connection board. It is a high-strength concrete plate for reinforcing an existing slab so as to bear the stress applied to the existing slab after curing, and the high-strength concrete plate includes a post- installed anchor hole and a connection board hole, The connection board fixing bolt is screwed into the connection board fixing nut to attach the connection board to the high-strength connector. Together they can be fixed to each other the high strength concrete plates are by binding to discrete plate, and characterized in that the edge portion provided around said high strength concrete plate engage with each other with the edge of the adjacent high strength concrete plate To do.

[ 2 ] In the high-strength concrete plate for reinforcing an existing slab as described in [ 1 ] above, the edge of the high-strength concrete plate is appropriately shifted in the long side direction and the short side direction by shifting the rectangular concrete plate with two edges. The shape is such that it is integrally molded.

According to the present invention,
(1) The high-strength concrete plate for reinforcing existing slabs is lightweight and excellent in workability and durability.

  (2) The high-strength concrete board is integrally formed as if the two high-strength concrete sheets on the lower and upper sides are bonded together, and the upper high-strength concrete board is placed against the edge of the lower high-strength concrete sheet. The edge of the thin plate is shifted and laminated, and the edge of the high-strength concrete plate adjacent to the edge is joined to increase the edge distance, thus improving the sealing performance. be able to.

It is a top view of the high-strength concrete board which shows the Example of this invention. It is a right view of FIG. It is a rear view of FIG. FIG. 2 is a front side view of FIG. 1. It is a side view of the connection board of the high-strength concrete board which shows the Example of this invention. FIG. 6 is a plan view of FIG. 5. It is a drawing substitute photograph which shows the state which arranged the high-strength concrete board which shows the Example of this invention side by side. It is a drawing substitute photograph which shows the state which fixed the high intensity | strength concrete board which shows the Example of this invention with the connection board. It is sectional drawing which shows the attachment state to the existing slab of the high strength concrete board which shows the Example of this invention. It is sectional drawing (bar arrangement diagram) which shows the attachment state to the existing slab of the high strength concrete board which shows the Example of this invention.

The reinforcing slab for reinforcing an existing slab according to the present invention is a high-strength concrete plate integrally formed as a high-strength concrete plate formed into a rectangular or square shape, and the high-strength concrete plate is placed under the existing slab. It is possible to construct a high-strength concrete panel by connecting the adjacent high-strength concrete plates to each other by a connection board, and function as a mold when the filler is driven, and hardening the filler A high-strength concrete plate for reinforcing an existing slab that bears the stress applied to the existing slab later, the high-strength concrete plate having a post- installed anchor hole and a connection board hole, and the connection The connecting board fixing bolt is screwed into the board fixing nut to attach the connecting board to the high strength concrete. Together can be fixed to each other the high strength concrete plates are by binding to preparative plate, edge provided around the high strength concrete plate is adapted to engage with each other with the edge of the adjacent high strength concrete plate.

  Hereinafter, embodiments of the present invention will be described in detail.

  1 is a plan view of a high-strength concrete board showing an embodiment of the present invention, FIG. 2 is a right side view of FIG. 1, FIG. 3 is a rear view of FIG. 1, FIG. 4 is a front side view of FIG. FIG. 6 is a plan view of FIG. 5, FIG. 7 is a drawing-substituting photograph showing a state in which the high-strength concrete plates are arranged side by side, and FIG. 8 is a diagram showing the connection of the high-strength concrete plates. It is a drawing substitute photograph which shows the state fixed with the board.

  In these drawings, 2 is a high-strength concrete thin plate, 2A is an edge of a high-strength concrete plate 2B, which will be described later, and 2B is a high-strength concrete plate integrally formed so that two high-strength concrete thin plates 2 are laminated and bonded together. 3 is an arrangement portion of the connection board 6, 4 is a hole for connection board, 5 is a hole for post-installation anchor, 7 is a nut for fixing the connection board 6, and 9 is constructed by connecting the high-strength concrete thin plate 2. High strength concrete panel.

  As shown in FIGS. 1 to 4, the high-strength concrete plate 2B is appropriately formed in both sides of a rectangle or square so that the high-strength concrete thin plate 2 forms an edge 2A having a predetermined width (15 mm in this embodiment). It is built by molding into a shape that overlaps with a distance.

  As shown in FIG. 7, the high-strength concrete plates 2 </ b> B are arranged in parallel, and the connection board 6 as shown in FIGS. 5 to 6 and 8 is inserted into the fixing nut 7 and the connection board hole 4. By fixing using the fixing bolts 8 (see FIGS. 9 and 10) of the board 6, the high-strength concrete panels 9 can be constructed by connecting the high-strength concrete plates 2B arranged in parallel.

  Note that the high-strength concrete plate 2B is integrally formed such that, for example, two thin plates having a thickness of 549 × 549 mm and a thickness of 8 mm are bonded to each other, and has a size of 564 mm × 564 mm and a thickness of 16 mm. Here, the dimension of the high-strength concrete thin plate 2 is a square, but may be a rectangle.

  Here, the high-strength concrete plate for reinforcing an existing slab used in the present invention is formed of high-strength concrete such as fiber-reinforced concrete or resin concrete. For example, metal fiber reinforced concrete can be used as high strength fiber reinforced concrete. A preferred example of the metal fiber reinforced concrete is a metal fiber reinforced concrete described in Patent Document 2.

  That is, this metal fiber reinforced concrete has cement, aggregate particles having a maximum particle size of 2 mm or less, pozzolanic reaction particles having a primary particle size of 1 μm or less, a length of 2 mm or more and a length-diameter ratio of 20 or more. Mainly contains metal fibers.

  The mechanical properties of the metal fiber reinforced concrete are very high, with a tensile strength of 12 MPa or more, a bending strength of 25 MPa or more, and a compressive strength of 150 MPa or more. Moreover, since it becomes a dense formation, a highly durable concrete board can be produced. Examples of concrete satisfying such conditions include DUCKAL (registered trademark) concrete (manufactured by Taiheiyo Cement Co., Ltd.).

  On the other hand, resin concrete is concrete in which an aggregate is bonded using a liquid resin as a binder instead of cement. Resin concrete can form a high-strength concrete panel having high strength and excellent durability by curing in a short time with a high bonding force by a polymerization reaction between a resin and a catalyst. As for the mechanical properties of resin concrete, the tensile strength is 10 MPa or more, the bending strength is 20 MPa or more, and the compressive strength is 100 MPa or more.

  Since both the above-described ductal concrete and resin concrete are dense materials, it is possible to block deterioration factors such as salinity and moisture and prevent re-degradation of repaired parts.

  Thus, although the high-strength concrete board for reinforcement of the existing slab of this invention can be produced with ductal concrete or resin concrete, it is not limited to these high-strength concrete boards.

The connection board 6 can be a rectangular metal plate. Connecting board 6, whether the stress acting on the adjacent high strength concrete thin plate 2 mutually transmit and a high strength concrete thin plate 2 is damaged earlier, the connection board 6 as it has strength so as not to damage Any material or shape may be used.

  Next, the reinforcement of the existing slab using the above-described high-strength concrete plate for reinforcing the existing slab of the present invention will be described.

  FIG. 9 is a cross-sectional view showing a state in which a high-strength concrete board showing an embodiment of the present invention is attached to an existing slab.

  In this figure, 1 is an existing slab, 8 is a fixing bolt for the connection board 6, 10 is a non-shrinkable filler, 11 is a post-installed anchor, and 12 is a post-installed anchor fixing nut.

As shown in FIG. 9, when installing a high-strength concrete plate 2B to the existing slab 1, and insert the post-installed anchor 11 after installation anchor hole 5 of the high-strength concrete plate 2B, after facilities Koa anchor fixing nut 12 to fix.

  Next, after the high-strength concrete panels 2B arranged in parallel and fixed to the lower surface of the existing slab 1 in this way are connected to each other by the connection board 6, a high-strength concrete panel 9 is constructed. And non-shrinkage filler 10 (for example, non-shrink mortar or cement slurry) is poured between the slab 1 and the existing slab 1. At that time, as described above, since the edge portion 2A exists in the high-strength concrete plate 2B, the adjacent edge portions 2A are engaged with each other. 10 can be prevented from flowing out. Further, by using the non-shrinkable filler 10, an increase in the thickness of the member cross section can be suppressed.

  In addition, a large number of slits or cotters can be provided on the surface of the above-described reinforcing high-strength concrete plate 2B of the existing slab at the location indicated by double hatching in FIG. In this case, a high-strength concrete board is attached so that the surface provided with the slit or cotter is on the existing slab side. As a result, when the filler is driven between the high-strength concrete plate and the existing slab, the contact area between the high-strength concrete plate and the filler can be increased. There is an advantage that the stress applied to the existing slab can be borne more later.

  Further, the edge portion of the high-strength concrete plate 2B may be formed by integrally forming two rectangular concrete thin plates so that the distance between the long-side direction and the short-side direction is appropriately shifted.

  FIG. 10 is a cross-sectional view (bar arrangement diagram) showing a state in which a high-strength concrete board showing an embodiment of the present invention is attached to an existing slab.

  Thus, according to the present invention, since a high-strength concrete board can be applied to an existing slab manually, there is no need to assemble a total scaffold and the workability is excellent. In addition, the high-strength concrete plate is connected and fixed with a connection board to construct a high-strength concrete panel, so it not only works as a formwork for pouring non-shrinkable filler, but also bears the stress acting on the existing slab. You can also. Moreover, since the non-shrinkable filler is used, an increase in the thickness of the member cross section can be suppressed. Furthermore, high-strength concrete is excellent in corrosion resistance, and has a water permeability coefficient and the like that is remarkably smaller than that of ordinary concrete. Therefore, deterioration factors can be blocked and durability is extremely high.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The concrete plate for reinforcement of an existing slab of the present invention can be used as a reinforcement method for an existing structure using a high-strength concrete plate that is excellent in workability and can block deterioration factors.

DESCRIPTION OF SYMBOLS 1 Existing slab 2 High-strength concrete thin plate 2A Edge 2B High-strength concrete plate 3 Connection board arrangement part 4 Connection board hole 5 Post-construction anchor hole 6 Connection board 7 Connection board fixing nut 8 Connection board fixing bolt 9 High-strength concrete panel 10 Non-shrinkable filler 11 Post-installed anchor 12 Post-installed anchor fixing nut

Claims (2)

A high-strength concrete plate integrally molded as if a high-strength concrete plate formed into a rectangle or a square is bonded, and the high-strength concrete plates are arranged in parallel under an existing slab, and are adjacent to each other. It is possible to construct a high-strength concrete panel by connecting and fixing the plates together with a connection board, functioning as a mold when the filler is driven, and bearing the stress on the existing slab after the filler is cured A high-strength concrete plate for reinforcing an existing slab, wherein the high-strength concrete plate is provided with a post-installation anchor hole and a connection board hole, and the connection board fixing nut is used for fixing the connection board. The high-strength concrete plates can be joined together by screwing bolts to connect the connection board to the high-strength concrete plates. Together can be secured to have the high-strength concrete slab reinforcement high strength concrete plates existing slab edge provided around characterized in that the engagement with each other with the edge of the adjacent high strength concrete plate. 2. The high-strength concrete plate for reinforcing an existing slab according to claim 1 , wherein the edge of the high-strength concrete plate has a shape in which two rectangular concrete thin plates are appropriately shifted in the long side direction and the short side direction. A high-strength concrete plate for reinforcing an existing slab, characterized by being integrally molded.