JP4563137B2 - Fiber-reinforced concrete permanent formwork - Google Patents

Description

The present invention relates to a permanent form frame made of fiber reinforced concrete.

In general, when constructing concrete retaining walls, housing cloth foundations, block fence foundations, earth retaining concrete, etc., conventionally, a wooden panel is cut, a separator is set, and a formwork is assembled by pressing it with a support. After that, after placing ready-mixed concrete on the mold, curing was performed, and after the concrete was hardened, the mold was removed, and the exposed concrete surface was finally repaired or finished.

However, the conventional wooden formwork assembled in the field requires skill to cut and assemble the wooden panel in accordance with the basic shape and the like, and in recent years, problems such as aging of workers and lack of skilled workers have arisen. In addition, it takes a lot of time to assemble and dismantle the formwork, and also takes a curing period, resulting in a long construction period, resulting in a high construction cost. Furthermore, there is a limit to the reuse of the dismantled wooden formwork, and there are environmental problems in disposing of it.

For this reason, an FRP permanent formwork is also proposed in which a formwork is produced with an FRP plate in which a fiber sheet such as carbon fiber, aramid fiber, glass fiber or the like is impregnated with resin, and after the ready-mixed concrete is placed, it is left as it is. (For example, patent document 1). This eliminates the need for dismantling the formwork and has the effect of preventing the effects of salt damage and carbon dioxide gas since the concrete surface is covered with the FRP plate. However, the permanent formwork assembled with this FRP plate is expensive to manufacture, and cutting at the site is cumbersome. When assembling the formwork, the assembly work such as setting the separator and pressing down with the support is complicated. Not popular.
JP 2002-146904 A

The present invention improves the above problems, can be produced in the factory in advance, is lightweight and easy to transport, can be easily assembled by simply installing it on the base concrete at the site, even if it is not a skilled worker, and can be stacked in multiple stages In addition to being able to be formed at any height, cutting work at the site is easy and can be modified according to the site, construction costs can be reduced by shortening the construction period, and the surface of the concrete structure can be covered. A neutral form can be prevented over a long period of time, and since it is made of the same concrete as the structure, it has good fixability, and provides a permanent form made of fiber reinforced concrete having excellent strength and durability.

The fiber-reinforced concrete permanent form according to claim 1 of the present invention is configured in a hollow box shape in which upper and lower surfaces and front and rear surfaces are opened by left and right side plates formed of concrete reinforced with reinforcing fibers and ribs connecting the left and right side plates. A projecting portion is formed on the upper surface of the left and right side plates, a step portion is formed on the bottom surface of the left and right side plates to engage the projecting portion, and a predetermined interval is provided above and below the opposing surface of the left and right side plates along the longitudinal direction thereof. The ribs are provided to connect the left and right side plates together.

Further, the fiber-reinforced concrete permanent mold according to claim 2 of the present invention is characterized in that the reinforcing fibers are formed of alkali-resistant glass fibers. The fiber-reinforced concrete permanent mold according to claim 3, wherein the intermediate rib for integrally connecting the left and right side plates, and the upper and lower ribs attached along the longitudinal direction of the side plates are attached with their plane positions shifted. It is characterized by being.

According to a fourth aspect of the present invention, there is provided a fiber reinforced concrete permanent mold, wherein the permanent mold of claim 1 is further provided with a mold holder for supporting the bottom of the permanent mold on the foundation concrete. It is what.

The fiber-reinforced concrete permanent mold according to claim 5 is characterized in that a corner connector for connecting side plates of corner portions where the permanent molds are joined to each other is attached to the permanent mold of claim 1. To do.

The fiber-reinforced concrete permanent mold according to claim 6 is attached to the permanent mold according to claim 1 with a top end formed of a concrete plate reinforced with reinforcement fibers that further closes the upper opening of the permanent mold. It is characterized by that.

According to the fiber-reinforced concrete permanent form according to claim 1 of the present invention, since the permanent form is manufactured in advance at the factory, it is not necessary to have skill only by installing it on the base concrete. As a result, there is no need to assemble the formwork at the site, and it is effective for construction where there is no space between the neighboring house and where heavy machinery does not enter. Also, since the ready-mixed concrete is simply poured into the permanent formwork at the site, the upper permanent formwork can be stacked without waiting for the concrete curing period, and it can be formed to any height by adjusting the number of stacked stages. be able to.

Further, since the horizontal bars are placed on the ribs and applied to the vertical bars to bind the reinforcing bar intersecting portion and the upper rib, the reinforcing bars are fixed at a fixed position, and variations in strength can be prevented. Furthermore, since the surface is covered with the left and right side plates, finishing work is not necessary, and the construction period can be shortened and the construction cost can be greatly reduced.

In addition, the surface is made of concrete mixed with reinforcing fibers and strengthened so that the surface strength can be maintained and the surface can be protected to prevent the neutralization of the concrete structure over a long period of time. In addition, since it is made of the same concrete as the structure, it has good fixability, is excellent in strength and durability, has a substantially covering function, and can be thinned.

According to the fiber-reinforced concrete permanent form of claim 2, since alkali-resistant glass fiber is used as the reinforcing fiber, the glass fiber does not melt even if mixed in the concrete, and the surface strength is maintained over a long period of time. Can be held at a low cost.

According to the fiber reinforced concrete permanent mold according to claim 3, since the ribs are attached to the upper and lower ends of the end of the permanent mold, the connection strength is high, and the swelling of the end when the ready-mixed concrete is poured is prevented. In addition, the upper and lower ribs in the middle are attached with their plane positions shifted, so that the flow of the ready-mixed concrete can be smoothed and placed uniformly.

According to the fiber reinforced concrete permanent mold according to claim 4, since the mold holder for supporting the permanent mold is provided on the foundation concrete, there is no displacement, and the wedge is inserted into the bottom surface. This allows the permanent formwork to be leveled, and construction as designed is possible.

Further, according to the fiber reinforced concrete permanent mold according to claim 5, two corner couplers are installed at the corner portion, and the left and right side plates of one permanent mold and the left and right side plates of the other permanent mold are integrated. Since they are connected, the corner portion can be prevented from shifting.

Further, according to the fiber-reinforced concrete permanent mold according to claim 6, since the top surface of the concrete inside the permanent mold is covered with the top end, the finishing work is unnecessary, the work period can be shortened, and It is effective for neutralization due to invading rainwater and gas.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In the figure, reference numeral 1 denotes a fiber-reinforced concrete permanent mold, which is composed of left and right side plates 2 and 3 made of concrete reinforced with reinforcing fibers, and rectangular bar-shaped ribs 4 connecting the left and right side plates 2 and 3. It has a hollow box shape with front and rear surfaces opened. As the reinforcing fiber, for example, alkali-resistant glass fiber or carbon fiber is used. In this case, when ordinary glass fiber is used, it is dissolved by alkali contained in the concrete, and thus glass fiber subjected to alkali resistance treatment is preferable.

As shown in FIG. 2, protrusions 5 and 5 are formed on the upper surfaces of the left and right side plates 2 and 3 of the fiber reinforced concrete permanent mold 1 formed in a hollow box shape. Step portions 6 and 6 with which the protruding portions 5 and 5 are engaged are formed. Further, as shown in FIG. 4, projecting portions 7 and 7 are formed in the vertical direction at one end portion along the longitudinal direction of the left and right side plates 2 and 3, and the other side of the left and right side plates 2 and 3. Step portions 8 and 8 with which the protrusions 7 and 7 are engaged are formed in the end portion in the vertical direction.

Further, as shown in FIG. 3, square bar-like ribs 4 and 4 for connecting the left and right side plates are attached to the upper and lower sides of both ends of the left and right side plates 2 and 3, respectively. Further, the intermediate rib 4 is attached along the longitudinal direction of the left and right side plates 2 and 3, and the upper and lower ribs 4 are attached so that the upper and lower ribs 4 are shifted from each other.

Reference numeral 10 denotes a mold holder, as shown in FIG. 5, the metal plate 11 is bent at both ends upward to form sandwiching pieces 12 and 12, and the central portion is cut down to be made of plastic or wooden. A wedge insertion port 14 into which the wedge 13 is inserted is formed, and a positioning nail hole 15 is opened in the middle of the metal plate 11. Reference numeral 16 denotes a corner connector. As shown in FIG. 6, the metal plate 18 is joined to the left and right side plates 2 along one side of the L-shaped metal plate 17 with a space inside. A planar U-shaped corner insertion portion 19A into which one of the three is inserted is formed. In addition, the metal plate 20 is joined along the other side of the metal plate 17 which is joined in the middle of the metal plate 18 and bent into an L shape, and one of the left and right side plates 2 and 3 is inserted. The corner insertion portion 19B is integrally formed.

Reference numeral 22 denotes a top end, which is formed of a concrete plate 23 reinforced with reinforcing fibers in the same manner as the side plates 2 and 3 as shown in FIG. Step portions 24 and 24 that engage with the formed protrusions 5 and 5 are formed.

The case where earth retaining concrete is constructed using the fiber-reinforced concrete permanent mold 1 having the above-described configuration will be described. The fiber-reinforced concrete permanent mold 1 is, for example, a hollow box shape in which concrete mixed with alkali-resistant glass fibers is molded with a mold, and left and right side plates 2 and 3 are connected by square-shaped ribs 4 as shown in FIG. The thickness of the left and right side plates 2 and 3 is, for example, about 12 mm, and the square-shaped rib 4 is formed into a trapezoidal cross section having a bottom side of about 33 mm, an upper side of about 20 mm, and a height of 20 mm, and the overall height is about 200 mm. The width is about 150 mm and the length is about 2000 mm.

Next, as shown in FIG. 8, first, the base concrete 26 is constructed, and a plurality of vertical bars 27 are erected at predetermined intervals along the center of the earth retaining to be constructed before the base concrete 26 is cured. Next, the mold holder 10 shown in FIG. 5 is placed on the base concrete 26 at predetermined intervals along the vertical stripes 27, and a nail is driven into the positioning nail hole 15 for positioning. Next, the permanent mold 1 is set on the mold holder 10, and the left and right side plates 2, 3 are clamped from outside by the clamping pieces 12, 12.

After this, the wedge 13 is inserted under the permanent mold 1 from the wedge insertion openings 14 and 14 of the mold holder 10 to bring it out horizontally. The forehead is pressed by a panel (not shown) to close the left and right openings.

Next, as shown in FIG. 9, the ready-mixed concrete 29 is poured from the upper opening of the permanent mold 1 and placed. In this case, the ribs 4 and 4 are attached to the upper and lower sides of the end of the permanent mold 1, so that the connection strength is high and it is possible to prevent the end from swelling when the ready-mixed concrete 29 is placed, Since the ribs 4 are attached with their plane positions shifted, the flow of the ready-mixed concrete 29 becomes smooth and can be placed uniformly.

Thereafter, as shown in FIG. 10, when the upper permanent mold 1 is overlaid on the lower permanent mold 1, the protrusions 5 projecting from the upper surfaces of the left and right side plates 2 and 3 of the lower permanent mold 1. 5 are engaged with and connected to the step portions 6 and 6 formed on the bottom surfaces of the left and right side plates 2 and 3 of the upper permanent mold 1. Next, the horizontal bars 28 are placed on the upper rectangular bar-shaped ribs 4 and applied to the vertical bars 27 to bind the reinforcing bar intersections and the upper ribs 4 with binding wires. Thereafter, the ready-mixed concrete 29 is placed from the upper opening of the upper permanent mold 1.

Next, before the ready-mixed concrete 29 is hardened, the projecting portions 5 and 5 projecting on the upper surfaces of the left and right side plates 2 and 3 of the upper permanent mold 1 covering the top end 22 shown in FIG. When the ready-mixed concrete 29 is hardened by engaging with the step portions 6 and 6 formed on the bottom surface, they are joined together to complete the earth retaining.

Therefore, when the earth retaining concrete is constructed using the fiber reinforced concrete permanent mold 1 having the above-described configuration, the permanent mold 1 is manufactured in advance at the factory. This eliminates the need for on-site formwork assembly. For this reason, it is effective for construction at a site where a space cannot be secured with a neighboring house or a heavy machine does not enter. In addition, the weight is about 2000 mm, and the weight is about 34 kg, and it is easy to carry.

Further, since the ready-mixed concrete 29 is molded in advance and poured into the permanent mold 1, the upper permanent mold 1 can be stacked without waiting for the concrete curing period, and the number of stages of the permanent mold 1 to be stacked. By increasing the number, it is possible to form an earth retaining of any height.

Further, since the horizontal bars 28 are placed on the upper ribs 4 and applied to the vertical bars 27 to bind the reinforcing bar intersections and the upper ribs 4, the horizontal bars 28 are fixed at a fixed position, and variation in strength can be prevented. it can. Furthermore, since the surface is covered with the left and right side plates 2 and 3 and the upper surface is covered with the top end 22, no finishing work is required, and the construction period can be further shortened.

Moreover, since the surface is formed of concrete mixed with alkali-resistant glass fibers, the glass fibers do not melt and can maintain the surface strength over a long period of time, and the compressive strength is improved by 2 to 4 times compared to the concrete, bending strength. Is also effective for neutralization of concrete. Therefore, since the fiber-reinforced concrete permanent mold 1 of the present invention is mainly made of concrete, it can be manufactured at a low cost, and the construction period can be shortened and the entire construction cost can be greatly reduced. When constructing 100m earth retaining, the conventional method of assembling a wooden panel takes 14 days, but when the permanent form 1 of the present invention is used, the construction time is 7 days. In comparison, the construction cost could be reduced by 70%.

When the fence is mounted on the earth retaining member, as shown in FIG. 12, the top end 22 having the insertion holes 31 opened at a predetermined interval is used, and the fence post 32 before the ready-mixed concrete 29 is hardened. Is inserted into the insertion hole 31 and cured, and then the fence is attached to the fence post 32.

FIG. 13 shows another embodiment showing a method of joining corner portions when constructing a house cloth foundation. As shown in FIG. 13, the upper and lower ribs 4 at the ends of the permanent molds 1 and 1 are cut with an electric cutter at the corner portion of the housing foundation concrete that intersects at right angles, as shown in FIG. The right side plates 3 and 3 are cut short. Two corner couplers 16 and 16 are installed in the corner portion, the left and right side plates 2 and 3 of one permanent mold 1 are inserted into the corner insertion portions 19A and 19A, and the other is inserted into the corner insertion portions 19B and 19B. The corner portions can be connected by inserting the left and right side plates 2 and 3 of the permanent mold 1.

Further, as shown in FIG. 14, if the corner connector 16 is formed by forming a colored brick pattern 33 on the outer metal plate 17, the basic appearance is excellent in terms of design. The corner connector 16 is not limited to a metal plate but may be made of plastic or concrete.

In the above description, the mold holder 10 is formed of a metal plate. However, the mold holder 10 may be formed of a plastic plate, and the shape of the rib 4 is not limited to a square bar but may be a round bar. Moreover, although the case where earth retaining concrete or house foundation concrete was constructed was shown in the above description, it can also be widely used when constructing retaining walls, concrete walls, block fence foundations, and the like.

It is a perspective view which shows the fiber reinforced concrete permanent formwork by one Embodiment of this invention. It is a front view which shows the permanent formwork of FIG. It is a center part longitudinal cross-sectional view of the permanent mold shown in FIG. It is a top view of the permanent formwork shown in FIG. It is a perspective view which shows a formwork holder and wedge. It is a perspective view which shows a corner coupling tool. It is a front view which shows a top end. It is sectional drawing which shows the state which installed the permanent formwork of FIG. 1 on the base concrete. It is sectional drawing which shows the state which poured concrete into the permanent formwork of FIG. FIG. 10 is a cross-sectional view showing a state where upper permanent molds are stacked on the permanent mold shown in FIG. 9. It is sectional drawing which shows the state which poured concrete into the upper permanent form of FIG. It is sectional drawing which shows the state which attached the fence support | pillar by other embodiment of this invention. It is a top view which shows the state which joined the corner part at the time of constructing a housing cloth foundation by other embodiment from which this invention differs with a corner connector. It is a perspective view which shows the state joined to the corner part of the housing cloth foundation by the brick-shaped corner connector by other embodiment from which this invention differs.

Explanation of symbols

1 Fiber-reinforced concrete permanent form 1
2 Left side plate 2
2 Right side plate 3
4 Ribs 4
5 Protrusion
6 steps
7 Protrusion
8 steps
10 Formwork holder
11 Metal plate
12 Clamping pieces
13 Wedge
14 Wedge insert
15 Positioning nail hole 16 Corner connector
17 Metal plate
18 Metal plate
19A, 19B Corner insertion part
20 Metal plate
22 top
23 Concrete board
24 Projection
26 Base concrete
27 Longitudinal muscle
28 Transverse muscle
29 Ready-mixed concrete
31 Insertion hole
32 Fence support
33 Brick pattern

Claims (6)

The left and right side plates formed of concrete reinforced with reinforcing fibers and the ribs connecting the left and right side plates are formed in a hollow box shape with the upper and lower surfaces and the front and rear surfaces opened, forming protrusions on the upper surfaces of the left and right side plates, A step portion is formed on the bottom surface to which the protruding portion is engaged, and ribs are provided at predetermined intervals along the longitudinal direction above and below the opposing surfaces of the left and right side plates to integrally connect the left and right side plates. Permanent formwork made of fiber reinforced concrete. 2. The fiber-reinforced concrete permanent mold according to claim 1, wherein the reinforcing fibers are made of alkali-resistant glass fibers. 2. The fiber reinforced concrete according to claim 1, wherein an intermediate rib for integrally connecting the left and right plates is attached so that upper and lower ribs attached along the longitudinal direction of the side plates are shifted in the plane position. Permanent formwork. 2. A fiber-reinforced concrete permanent mold, comprising: a fiber-reinforced concrete permanent mold according to claim 1, further comprising a mold holder for supporting the bottom surface of the permanent mold on the foundation concrete. 2. A fiber-reinforced concrete permanent mold, comprising: a fiber-reinforced concrete permanent mold according to claim 1; and a corner connector for connecting a side plate of a corner portion where the permanent molds are joined to each other. 2. A fiber-reinforced concrete-made permanent mold according to claim 1, further comprising a top end formed of a concrete plate reinforced with a reinforcing fiber that closes the upper opening of the permanent mold. Permanent formwork.