JP3639187B2 - Concrete repair panel manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a panel for repairing a concrete surface such as a tunnel.
[0002]
[Prior art]
In recent civil engineering work, concrete placement is an indispensable technique. For example, concrete is also cast on tunnel walls such as railways and highways. However, the anchor to the natural ground is insufficient at the time of placing concrete, or the concrete may be peeled off or collapsed after placing depending on the choice of cement material.
[0003]
For this reason, the degree of delamination is inspected visually or by hitting feeling or the like on the concrete wall in the tunnel, and when there is delamination or dropout, the anchor is driven deeply into the natural ground, epoxy resin etc. It has been used to prevent peeling by pouring or to drop a large amount of concrete around the site and place new concrete here.
[0004]
Then, after such measures are taken, the concrete surface is covered with a metal plate, and in some cases, the fixed metal plate may be removed and inspected to confirm the measures taken.
[0005]
The present inventor has already proposed a new concrete repair panel in view of the prior art. That is, a panel that is used in contact with a repair surface of concrete, and normally, a see-through hole through which the concrete surface can be visually observed is formed by ribs that run vertically and horizontally, and the ribs are vertically long sections rising from the concrete surface. A concrete repair panel having a shape has been proposed.
[0006]
[Problems to be solved by the invention]
The present invention proposes an improved manufacturing method for the above-mentioned concrete repair panel, which simplifies the manufacturing process and reduces the manufacturing cost.
[0007]
[Means for Solving the Problems]
The gist of the present invention is a method for producing a panel for repairing a concrete surface, in which a see-through hole is formed by a lattice-shaped rib having a longitudinally long cross-sectional shape toward the inner and outer surfaces of the panel. A mold M1 having a convex portion that forms a groove and a groove as a cavity that forms a rib, and a cavity in which a portion of the fluoroscopic hole is filled with a resin described later , and the convex portion of the mold M1 The mold M2 is opposed to the mold M2 with a predetermined gap, and sheet molding compound (SMC) or bulk molding compound (BMC) is supplied as resin in each of these cavities and molded under heating and pressure. A concrete repair surface characterized in that it is cured to obtain a bottomed panel substrate, and then the bottomed resin portion that closes the fluoroscopic hole is cut in one plane. It relates to the preparation of the panel.
[0008]
Usually, the cross-sectional shape of the rib is a trapezoid whose tip is gradually narrowed from the inner surface side (concrete surface side), and the mold M1 has a structure corresponding to such a shape. A pin is erected from M1 or mold M2.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the mold M1 has a convex portion and a groove constituting the panel, and the rising angle of the convex portion is inclined at a substantially right angle or slightly inward. Used. On the other hand, the mold M2 is intended to close the perspective hole of the panel with a predetermined clearance with respect to the convex portion, generally used as the upper die. Then, SMC or BMC is supplied into the cavity defined by both molds, and molded and cured under heating and pressure to obtain a panel. In this state, the fluoroscopic hole is closed with a thin resin part. Has been. That is, the resin portion forms a plate that closes the see-through hole, and finally the resin portion (plate) is cut in one plane to obtain a panel.
[0010]
In the present invention, the resin fills one of the grids of the panel and forms a mounting hole on the concrete surface at the time of molding the panel for mounting on the concrete surface. is there.
[0011]
The panel is obtained from SMC or BMC as described above, and the binder used is preferably an unsaturated polyester resin. The glass fiber used is 2 inches or less in the SMC method, and in the BMC method. What was cut | disconnected to 1/4 inch or less is used, and this glass fiber is normally contained 15 to 55% or less. That is, by adopting the above fibers together with the degree of opening described later, many glass fibers penetrate into the inside of the skeleton part at the time of compression molding, and maintenance of strength and appearance are improved. If the glass fiber content is less than 15%, the reinforcing effect by the glass fiber cannot be obtained, and if it exceeds 55%, the fluidity of SMC or BMC is deteriorated and it is difficult to obtain a predetermined shape. become.
[0012]
More specifically about the SMC method, when the shape of the panel is complicated, when the conventional hard type glass fiber is used, the panel is divided into a portion having a large amount of resin and a portion having a large amount of glass. It tends to be. For this reason, in the present invention, a so-called soft type glass fiber having a large opening degree is preferably used, and generally used in combination with a conventional hard type glass fiber. As for the degree of opening, the glass fibers focused by a binder are immersed in styrene for a predetermined time to show the degree of fiber dispersal, and the degree of opening is 30% or less. About 50% is called semi-hard type, and 70% or more is called soft type.
[0013]
The obtained panel is used in contact with and fixed to the concrete repair surface, and this panel is contacted and fixed to the repaired concrete surface to prevent the concrete from collapsing, and the repair state of the concrete surface is visually observed from the perspective hole. It is characterized by what it can do.
[0014]
【Example】
Hereinafter, the present invention will be described in more detail with reference to the drawings.
1 to 2 are diagrams showing an outline of a first manufacturing method of a concrete repair surface panel used in the present invention. FIG. 1 shows a manufacturing method of the entire panel, and M1 is a see-through hole (in this example, a lattice hole). And a groove 1b for forming a rib, which is a lower mold. In this example, the convex portion 1a has a trapezoidal cross section as a whole, and is formed with an angle ridge slightly inside. The upper mold M2 is disposed at a position slightly separated from the convex part 1a of the lower mold M1, and a sheet molding compound C in which glass fiber is blended with an unsaturated polyester resin is laminated between them and heated and pressurized. The panel substrate 20 was formed by the above.
[0015]
The resin filled in the cavity is supplied with an unsaturated polyester resin composition (glass fiber content 25%) in which hard type glass fibers having a cutting length of 1 inch and soft type glass fibers are used in combination. The panel substrate 20 was obtained by pressurizing and heating at a temperature of 50 ° C., a pressure of 50 kgf / cm 2, and a holding time of 8 minutes.
[0016]
The panel base 20 obtained here has a structure in which lattice holes 22 are formed by ribs 21 that are vertically long toward the inner and outer surfaces and trapezoidal in cross section, and are closed by a resin plate 23. Next, the resin plate 23 is cut in one plane. Here, the resin plate 23 is cut into a powder by a grinder, and the lattice holes 22 are opened to obtain a concrete repair surface panel 30. It was.
[0017]
FIG. 2 is a perspective view showing a state of the lattice holes 22 of the obtained panel 30. In the figure, 21 is a rib extending vertically and horizontally made of FRP resin (resin in which glass fiber is blended with unsaturated polyester resin), and a large number of lattice holes 22 are surrounded by ribs 21.
[0018]
The ribs 21 constituting the lattice holes 22 have a wide side on the back side of the panel 30, that is, a side in contact with the concrete surface, a narrow width on the front side, and a vertically long trapezoidal cross section. For this reason, while the contact area with respect to the concrete surface of the rib 21 becomes large and is stabilized, a concrete repair surface will be visible from the lattice hole 22 formed by this. Making the cross section of the rib 21 trapezoidal (inclined surface) also means that the mold can be easily released from the mold when the panel 30 is manufactured.
[0019]
FIG. 3 is a diagram showing an outline of a second manufacturing method for the entire concrete repair panel used in the present invention. The upper mold M2 is formed with a recess 2a with respect to the convex part 1a of the lower mold M1, and with a protruding line part 2b with respect to the groove part 1b, to ensure the fitting of both molds M1 and M2, The amount of resin to be cut is reduced, and the cutting portion is cut at the contact position (or slightly deeper position P) between the convex portion 1a and the depression 2a, so that the resin portion to be cut is small and the cutting itself is easy. It has the feature of becoming.
[0020]
Now, FIG. 4 is a diagram showing an outline of a method for producing a part for forming the mounting hole of the concrete repair surface panel of the present invention. A part of the convex part 1a constituting the lattice hole is replaced with a convex part 1c having a low height. And a pin 1d extending from this. In this case, the resin is filled around the convex portion 1c and the pin 1d. Therefore, a part of the lattice hole is closed, and a hole by the pin 1d is opened.
[0021]
FIG. 5 shows a concrete repair surface panel 30 obtained by the above-described manufacturing method. Holes 31 are formed at regular intervals, and the holes 31 are used to drive anchors 32 into concrete. Is done. The head portion 32a of the anchor 32 is preferably accommodated in a recess 33 formed by the convex portion 1c.
[0022]
【The invention's effect】
The present invention is as described above, and it is possible to easily manufacture a panel for repairing a concrete surface in which collapse of the concrete is prevented and the repaired concrete surface can be observed through the see-through hole of the panel, and an inexpensive panel is obtained. It is a thing.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a first production method for an entire concrete repair surface panel used in the present invention.
FIG. 2 is a perspective view showing a panel obtained by the manufacturing method of FIG.
FIG. 3 is a diagram showing an outline of a second production method for the entire concrete repair panel used in the present invention.
FIG. 4 is a diagram showing an outline of a method for producing a portion for forming a mounting hole of a concrete repair surface panel according to the present invention.
FIG. 5 is a perspective view showing a concrete repair panel according to the present invention obtained by the above-described manufacturing method.
[Explanation of symbols]
1a ... convex part,
1b ... groove
1c ... a convex part with a low height,
1d ... pin,
2a ... depression,
2b ... ridge,
20 ... Panel base,
21 ... ribs,
22 ... lattice holes,
23. Resin plate,
30: Panel for concrete repair surface ,
31 ... Hole,
32. Anchor,
32a: Anchor head,
33 ... dent,
M1: Lower mold,
M2: Upper mold,
C: Sheet molding compound,
P: Cutting position.

Claims (2)

A method for manufacturing a panel for repairing a concrete surface, in which a see-through hole allowing a visual observation of the concrete surface is formed by grid-like ribs having a longitudinally long cross-sectional shape toward the inner and outer surfaces of the panel, and a convex portion forming the see-through hole And a mold M1 having a cavity as a cavity for forming a rib, and a cavity in which a part of the see- through hole is filled with resin, and a mold having a predetermined gap with respect to the convex part of the mold M1 Cavities are configured with the mold M2 facing each other , and a sheet molding compound or a bulk molding compound is supplied as a resin into each of these cavities, and molded and cured under heating and pressure to obtain a bottomed panel substrate. Next, a method for producing a panel for repairing a concrete surface, wherein the bottomed resin portion for closing the see-through hole is cut in one plane.   2. The method for producing a concrete repair surface panel according to claim 1, wherein a pin is erected from a mold M1 or a mold M2 in a cavity filled with resin.

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