JPS62160366A - Concrete durability enhancing mold frame construction methodand mold frame used therein - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a formwork construction method that improves the durability of concrete placed in the formwork, and a formwork used therein.

``Prior art'' This type of conventional formwork construction method involves forming plywood dam plates into a predetermined shape in order to determine the shape, dimensions, and position of the structure to be constructed, such as columns, beams, walls, floors, etc. When I told B to assemble it, I placed thick timbers and shoring on the outside to hold the weir plate, and then concrete was poured inside, and then I left it until it had hardened sufficiently. It is known that he did so.

In this construction method, the formwork assembled for constructing beams and unfinished parts is placed downward in order to prevent the weir plates from deforming or the formwork from collapsing due to the weight of poured concrete. In addition, in order to slow down the carbonation rate of the poured concrete, thereby preventing rusting of the reinforcing bars and improving the durability of the concrete, the vacuum concrete method is used to remove the inside of the concrete. Measures are taken to avoid lowering the water content by sucking out water.

``Problems to be Solved by the Invention'' However, in the conventional formwork mentioned above, the strength is low considering the weight of the formwork, and the formwork assembled for constructing beams and unfinished parts has Support is required to suppress the deformation of the formwork and support the load that the formwork receives, which reduces the productivity of formwork work, causes delays in construction time and increases costs, and the vacuum concrete method It requires a large-scale device, is expensive to use, and has problems such as being extremely difficult to apply to columns, beams, walls, etc.

The present invention was made in view of the above-mentioned problems, and it improves the productivity of formwork work without using supports, performs concrete pouring at low cost, and improves construction, beams, and walls.

A formwork construction method that improves the physical properties of concrete by easily dewatering it from inside the floor, etc., and also improves its durability by minimizing air bubbles on the surface of the concrete. The purpose is to provide

"Means to Solve the Problem" In order to solve the above-mentioned problems, the construction method of the present invention provides a structure that maintains the shape of the weir plate on the outside of the weir plate, which has a large number of small holes for dewatering formed on the entire surface. This is a formwork construction method in which a piece of timber is provided to carry out the process, and a shoring is provided on the outside of the piece of timber to increase the rigidity of the timber. The feature is that after assembling the shape, concrete is poured inside.

In addition, the formwork of the present invention includes a weir plate in which a large number of small holes for dewatering are formed on the entire surface, and a thick material that maintains the shape of this weir plate.
This formwork includes a support for increasing the rigidity of the end pieces, and is characterized by comprising at least the weir plate and the end pieces.

In addition, in the present invention, the weir plate is made of a woven fabric impregnated with resin, the thick material is made of honeycomb material, and the shoring is made of F.
Preferably, it is made of RP material.

"Operation" In the present invention, by increasing the rigidity of the formwork of the floor and beam parts, the load of the floor part is received by the formwork of the beam part, and the load of the beam part is received by the formwork of the column part.

In addition, since small holes for dewatering are formed in the weir plate, the moisture in the concrete near the weir plate of the poured concrete flows out from this weir plate, and the moisture in the concrete that is on the inside of the concrete The moisture and paste contained inside also move outward (toward the weir plate side). At this time, the aggregate near the weir plate acts as a filter, causing clogging and forming a dense concrete layer inside the concrete near the weir plate (on the opposite side from the weir plate).

"Example" Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 15 show one embodiment of the present invention, and FIG. 1 is a diagram showing the entire formwork assembled for constructing a building.

In the figure, symbol A indicates the formwork for the column portion, B the formwork for the wall portion, C the formwork for the beam portion, and D the formwork for the unfinished portion. Figure 2 shows formwork A and B applied to the column and wall parts.
3 is an enlarged view of the formwork C of the beam portion, and FIG. 4 is an enlarged view of the formwork C of the unfinished portion. These formworks A, B,
As shown in Fig. 5, both C and D are double-layered by overlapping the thick material 2 shown in Fig. 6 on the outside of the weir plate [with a large number of small holes Ia for dewatering formed on the entire surface]. If the rigidity of the structure or the timbers 2 is insufficient, the shoring 3 shown in Fig. 7 may be superimposed on the outside to form a triple structure. There is.

In this embodiment, the weir plate 1 uses fibers coated and impregnated with resin in order to provide rigidity, but the pond may also be made of water-absorbing or water-permeable materials, such as paper. Materials such as small-hole metal mesonue materials may also be used.

The end material 2 is intended to maintain the shape of the weir plate 1 and to enhance the water permeability effect, and a honeycomb core is used to reduce weight. In order to increase the rigidity, the shape of the honeycomb can be a rectangle with a slope of 0 degrees or an angle as shown in Figure 8, a triangle as shown in Figure 9, a hexagon as shown in Figure 10, etc. ,
Its cross-sectional shape may be rectangular as shown in FIG. 11, trapezoidal as shown in FIG. 12, L-shape as shown in FIG. 13, etc. The shoring 3 is for further increasing the rigidity of the thick timber 2, and has various shapes depending on the stress generated in the formwork. As shown in Figure 2, formworks A and B for constructing columns and walls are formed in a ladder shape, and formwork C for the beam part shown in Figure 3 and formwork C for the beam part shown in Figure 4 are shaped like ladders. Plane trusses are used for parts where relatively high stress is generated, such as formwork.

It is formed into a shape such as a three-dimensional truss. Also, shoring 3
In order to reduce weight, FRP material is used and it is made of T2HL. Incidentally, the end thick material 2 and the shoring 3 may have an integrated structure.

Therefore, the formwork of the present invention can be significantly lighter than conventional plywood formwork (less than half the weight in this embodiment) and can have significantly higher rigidity.

In the formwork construction method of the present invention, formworks having a 2m structure or a 3-side structure as described above are used, for example, in formworks A, B, C, and D according to the shapes of columns, walls, beams, floors, etc. to be constructed. After assembling the structure, concrete was poured inside and allowed to cure sufficiently.

Next, the operation of the present invention will be explained. In the present invention, the formwork has a double or triple structure, a honeycomb core is used for the thick material, and a truss-shaped FRP material is used for the support to reduce weight and increase rigidity. Therefore, the load on the floor (the load of poured concrete and formwork, and the load for work) is received by the formwork C of the beam part, and the load of the beam part (the load of poured concrete and formwork C, D load and work load) are received by the formwork A of the column part and the formwork B of the wall part.

Therefore, in this formwork construction method, the formwork is not deformed or collapsed by the load of concrete, etc., and supports are provided below the formwork C of the unparted formwork and beam parts to support them. There is no need to set up formwork, streamlining formwork work and increasing productivity.

Furthermore, as shown in FIG. 14, the filter fiber used in the weir plate 1 has many small holes 1a for dewatering formed on its entire surface, so that the concrete cast in the formwork of the present invention C indicates that not only does the moisture in the concrete C1 near the weir plate L flow outward from the weir plate L, but also the moisture and paste contained in the concrete C2 located inside the concrete C1 flow outward (on the weir plate L side). ) move towards. At this time, the aggregate near the weir plate l acts as a filter, causing clogging, and a dense concrete layer C3 is formed inside the concrete C1 near the weir plate l. This concrete layer C3
As a result, the carbonation rate of the concrete placed in the formwork can be slowed down.
Since the air on the concrete surface easily escapes from the mold P, /A bubbles and junks do not occur on the concrete surface.

Here, Figure 15 shows the actual measured value of the accelerated carbonation depth of concrete with respect to CO2 action time. This is a graph of concrete. As is clear from this figure, using the formwork according to the present invention makes it possible to neutralize concrete at a slower rate than when using conventional plywood formwork. becomes.

Therefore, concrete maintains its alkalinity over a long period of time, so it is possible to improve the physical properties of concrete, such as increasing the concrete's compressive strength and abrasion resistance, as well as increasing its specific gravity.

In the case of reinforced concrete, it also slows down the rusting of the reinforcing bars and improves the durability of the building.

"Effects of the Invention" As explained above, in the construction method of the present invention, the formwork is lightweight and has sufficient strength, so it is possible to assemble the formwork without using supports, and the construction method of the present invention is effective. It is possible to rationalize and increase productivity, shorten construction period and reduce costs. Moreover, the formwork of the present invention is
Since many small holes for dewatering are formed in the weir plate, the concrete poured inside this weir plate has a dense concrete layer near the weir plate, which causes air bubbles and junks to form on the surface of the concrete. It also slows down the carbonation rate of concrete and maintains its alkalinity over a long period of time, making it possible to improve the concrete's physical properties such as increasing its compressive strength and abrasion resistance, as well as increasing its specific gravity. can.

[Brief explanation of drawings]

Figures 1 to 15 show one embodiment of the present invention. Figure 1 is a perspective view showing the entire formwork assembled to construct a building, and Figure 2 is a perspective view of the pillars and walls. Fig. 3 is a perspective view showing the formwork of the beam part, Fig. 4 is a perspective view showing the formwork of the unpartial part, Fig. 5 is a perspective view of the weir plate, Fig. 6 is a perspective view of the end timber, Figure 7 is a perspective view of the shoring, and Figures 8 to 10 are the X's in Figure 6. Fig. 8 is a front view showing a square honeycomb shape, Fig. 9 is a front view showing a triangular honeycomb shape, Fig. 10 is a front view showing a hexagonal honeycomb shape, and Figs. Figure 13 shows the X-
They are X-ray cross-sections, and Fig. 11 is a side sectional view without showing a rectangular honeycomb cross-section, Fig. 12 is a side sectional view without showing a trapezoidal honeycomb cross-section, and Fig. 13 is a side sectional view showing an L-shaped honeycomb cross-section. figure,
FIG. 4 is a perspective view showing concrete placed in a formwork, and FIG. 15 is a graph showing actual measured values of accelerated carbonation depth of concrete versus CO2 action time. l...Weir plate (fabric), 1a...Small hole, 2
... Thick material (honeycomb core), 3 ... Shoring (FRP material), C ... ・Concrete

Claims (5)

[Claims] (1) On the outside of the weir plate, which has a large number of small holes for dewatering formed on the entire surface, a thick piece of material is provided to maintain the shape of the weir plate, and furthermore, on the outside of the weir plate, the rigidity of the thick piece is increased. A formwork construction method that includes shoring for increasing concrete durability, characterized in that at least the weir board and the end pieces are assembled into a predetermined shape, and then concrete is poured inside. Improved formwork method. (2) A weir plate with many small holes for dewatering formed on the entire surface,
The formwork is made up of a thick piece of wood that maintains the shape of the weir board, and a shoring that increases the rigidity of the thick piece of wood, and includes at least the weir plate and the thick piece of wood. Characteristic formwork. (3) The formwork according to claim 2, wherein the weir plate is a woven fabric impregnated with resin. (4) The formwork according to claim 2 or 3, wherein the thick end material is a honeycomb material. (5) The formwork according to any one of claims 2 to 4, wherein the support is made of FRP material.