JPH06185202A - Form and construction method of concrete structure using the same - Google Patents

Abstract

PURPOSE:To reduce the labor and shorten the construction period of the building of a concrete structure, and improve the durability of the concrete structure to be built. CONSTITUTION:Timbering frames 20 are attached to a surface 10a of a PCa concrete board 10 through connecting means 30 for separators 40, and the PCa concrete boards 10 are connected oppositely to each other through the separators 40 to assemble a form 1 so that concrete is placed in a space S between the oppositely disposed boards 10. And after the lapse of a specific time after the placing of concrete, the timbering frames 20 are removed from the boards 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold used for placing concrete and a method for constructing a concrete structure using this mold.

[0002]

2. Description of the Related Art A formwork used for concrete pouring work is basically composed of a weir plate, a supporting work and its accessories. When constructing large-scale concrete structures such as box culverts and retaining walls, a large formwork that integrates the weir plate and the supporting work is used for the purpose of streamlining the construction.

As a dam plate for this large formwork, metal foam or plywood with a special surface finish is typically used so that it can withstand repeated use. Large formwork has a greater number of diversions than plywood formwork used in the construction of ordinary concrete structures, so being able to use it again and again will reduce waste and maintain the environment. This is an effective method, and it is also effective for labor saving and construction rationalization because it is a unit in which a large weir plate and supporting work are integrated.

[0004]

However, the above-mentioned conventional large formwork method has the following problems. (1) The formwork has an important role of assisting the sound progress of the hydration reaction of concrete, so that the formwork cannot be removed until sufficient concrete strength is developed, and It took a considerable number of days to convert the formwork into a formwork for concrete placement in the next construction section, and it was difficult to reduce the construction period. (2) For example, in the case of civil engineering structures, since many finishes are made by leaving the concrete exposed, it is necessary to place high-quality concrete for the purpose of improving durability, and sufficient construction management is required. (3) In recent years, even in civil engineering structures, in order to improve the aesthetic appearance, it is often the case that a relief pattern due to unevenness is applied to the concrete surface.However, when forming such a pattern on the concrete surface, the formwork Since it is necessary to attach a sheet with a pattern transfer mold to the barrier plate and pour concrete into it, on-site work is complicated.

The present invention has been made under the circumstances as described above, and its technical problem is to save labor and shorten the construction period for constructing a concrete structure, and to construct the concrete structure. To provide a formwork structure and a construction method capable of improving the durability of a concrete structure.

[0006]

The above-mentioned technical problems are as follows.
The present invention can effectively solve the problem. That is, the mold according to the present invention is a PCa in which the back surfaces are connected to each other via a separator and a means for connecting the separators so that the back surfaces face each other, and the back surfaces are joined to the cast concrete.
It includes a (precast) concrete plate and a supporting frame detachably attached to the surface of each PCa concrete plate through the connecting means. In a more preferred embodiment of this formwork, the back surface of the PCa concrete board is provided with a rough surface having a large number of irregularities, or the back surface of the PCa concrete board is provided with a required number of giveber streaks, or a support is provided. The work frame is a grid composed of a plurality of bars closely contacting with the surface of the PCa concrete plate and thick ends connecting the bars with adjustable intervals.

Further, in the method for constructing a concrete structure according to the present invention, a supporting frame is attached to the surface of the PCa concrete plate through a connecting means with a separator, and the PCa concrete plate is oppositely connected via the separator. Assemble the formwork by
Concrete is poured between the concrete boards a, and the supporting frame is removed from the PCa concrete boards after a predetermined time has passed from the concrete pouring.

[0008]

According to the present invention, a PCa concrete plate produced in advance at the factory is used as the weir plate. This PCa concrete plate is integrated with the cast concrete to form the outer wall surface of the concrete structure. After the concrete is cast, only the supporting frame is dismantled.

According to the preferred embodiment of the present invention, the rough surface and the gibber on the back surface of the PCa concrete plate, which is the joint surface with the cast concrete, realizes a reliable joint state with the cast concrete. Further, the lateral pressure of the cast concrete is received by the supporting frame, and this supporting frame reduces the thickness of the PCa concrete plate by adjusting the interval between the bars considering the magnitude of the lateral pressure. can do.

[0010]

FIG. 1 shows a preferred embodiment of a mold according to the present invention, which is generally indicated by reference numeral 1 and is a thin PCa concrete plate 10 and a PCa concrete plate 10. The separator 40 (see FIG.
And FIG. 5), and a support frame 20 that is detachably attached via a foam tie 30 as a coupling means that is coupled to the separator 40.

As shown in FIG. 2, the PCa concrete plate 10 has a required number of connecting holes 11 formed at appropriate intervals, and an extremely large number of irregularities 12 are formed on the back surface 10b which comes into contact with the poured concrete. Rough surface processing is performed and the required number of gibber streaks 13 are integrally attached. This PCa concrete plate 10 is produced in a factory in advance and has been sufficiently dried and shrunk, and there is no particular restriction on its size due to the construction method, but it is supported for lifting and carrying by a crane or the like during assembly. Of a thickness T of 50-70.
mm, width W is about 2 to 3 m, and height H is about 3 to
It will be about 3.6 m.

The support frame 20 has a plurality of (four in the illustrated example) crosspieces 21 to be brought into close contact with the surface 10a of the PCa concrete plate 10 and tenon holes 21a formed at predetermined intervals in the longitudinal direction on the crosspieces 21. It is composed of a plurality (four in the illustrated example) of end thick members 22 that penetrate the end thick members 22 and are assembled in a lattice shape. A connecting hole 21a corresponding to the connecting hole 11 of the PCa concrete plate 10 is formed in each of the crosspieces 21,
Screw insertion holes 22a are formed at both ends of the thick end material 22. In addition, the crosspiece 21 is a PCa concrete plate 1
The height of 0 is formed so as to project from both ends in the H direction, and the thick end material 22 is formed so as to project from both ends in the width W direction of the PCa concrete plate 10.

The foam tie 30, as shown in FIG. 4 and FIG. 5, typically includes a crosspiece 21 in the support frame 20.
And a screw rod 31 inserted into the coupling holes 21a and 11 of the PCa concrete plate 10, a nut 32 screwed into one end 31a of the screw rod 31, and a clamp member 33 moved by the nut 32. The other end 31b of the screw rod 31 is screwed with an end fitting 41 of a separator 40 for holding the molds 1 and 1 that are arranged facing each other and form a concrete filling space S at a predetermined interval. Has become.

In order to construct a large-scale concrete structure using the above-mentioned formwork 1, first, the required number of each component of the PCa concrete board 10 and the support frame 20 is carried into the construction site, and the crosspiece 21 and the thick timber are used. The support frame 20 is assembled by assembling 22 in a grid pattern. Next, as shown in FIG. 3, the assembled supporting frame 20 is hung on the surface 10a of the PCa concrete plate 10 by a crane or the like, and the screw bar 31 is inserted from the crosspiece 21 into the coupling hole 11 of the PCa concrete plate 10. As shown in FIG. 4, the screw rod 31 is inserted and screwed with the separator end fitting 41 arranged on the back surface 10b side of the PCa concrete plate 10 to assemble the form 1 into the state shown in FIG. .

The assembled formwork 1 is sequentially lifted by a crane or the like and arranged so that the back surfaces 10b of the PCa concrete 10 face each other as shown in FIGS. 5 and 6, and the separator end fittings 41 are attached to each other. Connect at 40. The formwork 1, 1 adjacent to each other in the width direction (lateral direction) is connected to each other by inserting the screw member 23 into the screw insertion hole 22a and tightening the end portions of the thick material 22 protruding from the left and right ends thereof. To do. In addition, the end portions of the crosspieces 21 protruding from the upper and lower ends of the molds 1 and 1 adjacent in the height direction are also
It can likewise be connectable to each other. Note that FIG.
In the figure, reference numeral A indicates a part of the concrete structure that was previously cast and cured. A work scaffold (not shown) or the like is integrally assembled with the support frame 20.

In the concrete-filled space S formed by the formwork 1 built in this way, the required reinforcing bars are arranged and then concrete is poured. At this time, the PCa concrete plate 10 in each formwork 1 functions as a weir plate, and the supporting frame 20 bears the lateral pressure at the time of this concrete pouring.

After the concrete is cured for about one day after the casting, the PCa concrete plate 10 and the supporting frame 2
As shown in FIG. 7, after removing the form tie 30 that tightens and connects 0 and the screw member 23 that connects the support frames 20 of the adjacent formwork 1 and 1,
The supporting frame 20 of each form 1 is sequentially removed by a crane or the like. The removed supporting frame 20 can be immediately used for formwork construction in the next work section by attaching it to a new PCa concrete plate prepared separately.

Here, since the PCa concrete board 10 which is tightly joined to both side surfaces of the cast concrete A1 functions as a protective material until the strength of the concrete A1 is expressed, it is sufficient even after the supporting frame 20 is removed. You can carry out various curing. Also, this PCa concrete board 1
0 is a back surface 10 which is a contact surface with the concrete A1.
Since the innumerable unevenness 12 is formed in b and the gibber 13 is provided, it is integrated with the concrete A1 with the progress of the curing period and directly constitutes the outer wall surface of the concrete structure. Moreover, since this PCa concrete board 10 is produced with high strength and high quality in the factory, it has excellent durability, prevents the occurrence of cracks on the outer wall surface, and the surface of the PCa concrete board 10 during the production process in the factory. It is possible to apply a desired pattern designed in advance to 10a, and this pattern can be used as it is as a pattern of the outer wall of the concrete structure after construction.

[0019]

As is apparent from the above description, according to the present invention, the following effects can be obtained. (1) PCa concrete plate is used as a dam plate of the formwork, and this PCa concrete plate can be produced in a factory with high strength and high quality in advance, and is integrated with the placed concrete to form the outer wall of the concrete structure. Therefore, it is possible to prevent the occurrence of cracks and the like on the surface of the concrete structure and improve the durability. (2) When a pattern is applied to the wall surface of a concrete structure, during the factory production process of the PCa concrete plate that becomes this wall surface,
A desired pattern can be easily formed. (3) After placing concrete, after a curing period of about one day, the supporting frame can be removed, and this supporting frame can be used immediately for formwork construction in the next construction section, so the construction period is significantly It can be shortened. (4) Since the PCa concrete plate as the dam plate of the formwork becomes a part of the concrete structure as it is, it does not become a waste material and can contribute to the effective use of resources.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a mold according to the present invention.

FIG. 2 is a perspective view of the back surface of the PCa concrete plate in the above embodiment.

FIG. 3 is an explanatory view showing a formwork assembling step of assembling the PCa concrete plate and the support frame in the above embodiment.

FIG. 4 is an enlarged sectional view showing a joint portion between the PCa concrete plate and the support frame.

FIG. 5 is a partial cross-sectional view showing a construction state of the mold.

FIG. 6 is a perspective view showing a construction state of the formwork.

[Fig.7] PCa is used for the support frame after concrete is placed.
It is a perspective view showing the process of removing from a concrete board.

[Explanation of symbols]

 1 Formwork 10 PCa Concrete Plate 10a Surface 10b Backside 12 Concavo-convex 13 Gibel Muscle 20 Supporting Frame 21 Crosspiece 22 Edge Thick Material 30 Form Tie (Coupling Means) 40 Separator

Claims (5)

[Claims] 1. A PCa concrete plate which is connected in a state in which the back surfaces face each other through a separator and a connecting means for the separator, and the back surface is joined with a cast concrete; and each PCa through the joining means. A formwork comprising: a supporting frame detachably attached to the surface of a concrete plate. 2. The mold according to claim 1, wherein the PCa concrete plate has a rough surface having a large number of irregularities formed on the back surface thereof. 3. The formwork according to claim 1, wherein a required number of dowel streaks are attached to the back surface of the PCa concrete plate. 4. The support frame according to claim 1, wherein the support frame is a grid composed of a plurality of bars closely contacting with the surface of the PCa concrete plate and thick ends connecting the bars with adjustable intervals. Formwork to do. 5. A process for assembling a formwork according to claim 1, wherein a supporting frame is attached to the surface of the PCa concrete plate through a connecting means with a separator, and the PCa concrete plate is face-to-face connected through the separator. Construction of a concrete structure comprising: a step of placing concrete between the facing PCa concrete boards; and a step of removing the support frame from the PCa concrete board after a predetermined time has passed from the concrete placing. Method.