JPH05179677A - Construction method for concrete structure - Google Patents

Abstract

PURPOSE:To simplify a formwork assembling process, eliminate a formwork separating and removing work, and reduce a construction period of a concrete structure. CONSTITUTION:Lower end parts of precast formworks 34 of plates of which surface is moulded flat and of which back surface has continuous wavy protrusions are temporarily stopped by angle members 30 fixed to a base surface 26A of a concrete structure to be constructed with their back surfaces facing each other, both surfaces are supported by supports for preventing expansion of the precast formworks, and concrete for a wall is placed. The precast formwork 34 is then bridged from the upper end parts of the precast formworks 34 to the upper end parts of the other precast formworks 34 for constructing the adjacent wall, with its back surface directed up, and concrete for a slab 50 is placed. These precast formworks are not removed, but they form the surfaces of the structure as they are.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a concrete structure integrally constructed with a wall rising from a base surface and a slab supported by the wall.

[0002]

2. Description of the Related Art A concrete structure such as an underground pit 10 functioning as a water storage tank as shown in FIG. 9 has a base 26, a wall 19 rising from the base 26,
The slab 50 supported by the wall 19 is integrally constructed of reinforced concrete.

Such an underground pit 10 is generally constructed by the following method. First, after assembling the base rebar, concrete is poured to construct the base 26. After that, the reinforcing bars protruding from the upper surface of the base 26 are wrapped with the reinforcing bars of the wall 19 to be bound, and the formwork of the wall 19 is assembled.
The formwork of the wall 19 is composed of a weir board and a splint that reinforces the board. Separators for holding the gaps are arranged on the molds of the opposing walls 19 to prevent the molds of the walls 19 from being caught during concrete pouring. Both ends of this separator are fastened with foam ties through a receiving member such as a short pipe for evenly distributing the force for fastening the mold. Concrete is poured into the formwork thus assembled to construct the wall 19.

Next, after the mold for the wall 19 is demolded or not, the form of the slab 50 is supported by supporting work, the slab rebars are arranged, concrete is poured, and the wall is placed. The upper part of 19 and the slab 50 are constructed integrally.

As described above, according to the conventional construction method, the wall 19 is
It is necessary to dispose a separator for holding the posture of the formwork, a receiving material and a foam tie, and a supporting structure for supporting the formwork of the slab 50. Further, after the concrete is hardened, the formwork of the wall 19 and The formwork of the slab 50 had to be demolded and removed.

For this reason, the formwork work and the support work work are troublesome, and there is a limit in shortening the construction period of the concrete structure.

[0007]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention simplifies the process of assembling the formwork, eliminates the work of removing and removing the formwork, and shortens the construction period of the concrete structure. It is an object to provide a possible construction method for a concrete structure.

[0008]

The method for constructing a concrete structure according to claim 1 is a method for constructing a concrete structure integrally constructed with a wall rising from a base surface and a slab supported by the wall. The lower end portion of a plate-shaped precast mold frame having a flat surface and a wavy continuous protrusion provided on the back surface is temporarily fixed by a temporary fixing member fixed to the base surface of the concrete structure, and the precast The first step of building the mold making the back surfaces face each other to form a mold for the wall, and supporting the surface of the precast mold with a support material to prevent the precast mold from being caught. The second step, the third step of placing the concrete for the wall, the support material is removed after the concrete for the wall is hardened, and next to the upper end of the precast mold. The fourth step of bridging the precast mold to the upper end of the other precast mold to construct the wall, and the precast product that has been bridged to form the slab And a fifth step of placing concrete on the formwork.

According to a second aspect of the present invention, in the method of constructing a concrete structure, in the first step, a precast formwork in which a circular hole is formed is built in and a through hole is formed in the wall. The outer peripheral surface and the inner peripheral surface of the circular hole are made to be the same surface, and a reinforcing member that comes into contact with the inner peripheral surface of the box-extracting member and prevents deformation of the box-extracting member is assembled.

[0010]

[Operation] The construction method of the concrete structure having the above configuration is
After the base of the concrete structure is constructed, the wall reinforcing bars are assembled, and in the first step, the wall is positioned on the base surface and the temporary fixing member is fixed at that position. In this temporary fixing member,
The lower end of a precast mold having a flat surface and a wavy continuous projection on the back is temporarily fixed, and the backs face each other to form a built-in wall mold.

Next, in the second step, the other end of the support material, one end of which is fixed to the base surface, is fixed to a fastener provided on the surface of the precast mold, thereby supporting the precast mold. Prevents the precast formwork from getting caught when placing concrete.

Next, in a third step, concrete for the wall is poured to a position lower than the upper end of the precast mold by a predetermined amount. This precast formwork is not removed but becomes the surface of the wall as it is, but since the surface of the precast formwork is finished flat, it looks good,
Since the wavy projections on the back surface of the precast formwork bite into the concrete on the wall, the precast formwork is firmly fixed to the wall.

When the concrete on the wall hardens,
In the fourth step, the support material is removed, and the precast formwork is directed to the upper end of the precast formwork and the upper end of the other precast formwork that constructs the adjacent wall, with its back surface facing upward. And fix it. Next, the slab rebar is assembled onto the precast mold for this slab, and the concrete of the slab is cast together with the concrete on the upper part of the wall that has not been cast to construct the wall and the slab integrally.

When forming a manhole or the like on the wall, in the first step, a precast mold frame having circular holes is built. At this time, the outer peripheral surface of the box-extracting material and the inner peripheral surface of the circular hole are made the same surface, and further, a reinforcing material for preventing deformation of the box-extracting material is abutted in the longitudinal direction of the inner periphery of the box-extracting material,
Both ends of the reinforcing material are fixed to the outer peripheral edge of the circular hole of the precast mold. As a result, the box punching material is not deformed when the concrete is poured, so that a highly accurate manhole is formed.

[0015]

EXAMPLE A case where the concrete structure construction method according to this example is applied to the underground pit 10 shown in FIG. 9 will be described with reference to FIGS.

As shown in FIG. 1, a spacer block 14 is arranged on the leveling concrete 12, and a lower force distribution bar 16 is arranged on the spacer block 14.
The lower base muscles 18 are assembled on the lower power distribution muscles 16 at a predetermined pitch. As a result, the covering of the lower base muscle 18 is secured. Next, the U-shaped processed lower wall main reinforcement 20 is assembled to the lower part of the lower base reinforcement 18 in the width direction of the wall 19 (see FIG. 9) at a predetermined pitch.

Next, as shown in FIG. 2, after assembling the upper base muscle 22 and the upper force distributing muscle 24, as shown in FIG.
Concrete is cast on the base 26 to build the base 26.

Here, as shown in FIG. 4, after the concrete of the base 26 is hardened, the upper wall main bar 28 is wrapped and bound to the lower wall main bar 20 protruding from the base surface 26A,
The assembling of the reinforcing bar of the wall 19 is completed. Next, marking out the position where the wall 19 rises is performed. The angle member 3 having an L-shaped cross section along the width direction of the wall 19 to the marking position
Fix 0 with anchor 32.

Next, as shown in FIG. 5, an overhead crane 54 is used to form a precast mold 34 as a mold for the wall 19.
6, the lower end of the precast mold 34 is temporarily fixed to the angle member 30, and the support pipe 36 supports the precast mold 34 from both sides. As shown in FIG. 10, this precast mold 34 has a plate-like shape and has a predetermined thickness capable of withstanding the strength of the mold, and its surface is finished flat and its back surface is wavy. A continuous protrusion 38 is formed of a reinforcing bar.
Further, as shown in FIG. 11, the support tube 36 can be adjusted in length by an insertion pin 39, and one end thereof is fixed to a fastener 40 attached to the surface of the precast mold 34. It Support tube 36
The other end of is locked to the hook 42. This hook 42
Is a floor bracket 44 anchored to the base surface 26A.
The support tube 36 is securely locked at the other end by inserting the wedge 46. As a result, it is possible to prevent the precast mold 34 from being caught when the concrete is poured.

As shown in FIG. 7, concrete is poured and cured from the upper end of the precast mold 34 to a position lowered by a predetermined amount. Next, after the concrete of the wall 19 is hardened, the support pipe 36 is removed, but the precast mold 34 is used as it is as the surface of the wall 19 without removing the mold, so that the work of removing and removing the mold can be omitted. In addition, since the surface of the precast mold 34 is finished flat, the appearance is good, and the wavy projections 38 on the back surface of the precast mold 34 cut into the concrete of the wall 19, so that the precast mold 34 Is firmly fixed.

Next, as shown in FIG. 8, the upper wall of the precast mold 34 and the adjacent wall 19 (see FIG. 9).
The precast mold making frame 34 is bridged and fixed to the upper end portion of another precast mold making frame 34 to be constructed. Here, the slab rebar 52 is assembled onto the precast mold 34 serving as the mold for the slab 50.
Next, the concrete of the slab 50 is cast together with the concrete on the wall 19 that has not been cast (see FIG. 7) to integrally construct the wall 19 and the slab 50. In this way, the precast mold 34 that functions as the mold of the slab 50 does not need to be supported by supporting work or the like, so the process can be shortened.

Since the materials and the like for constructing the underground pit 10 are hoisted and transported by the overhead crane 54 arranged above, the construction speed can be further improved.

Next, the manhole 5 as shown in FIG.
A construction method for forming 6 on the wall 19 will be described.

As shown in FIG. 12A, a precast mold 34 having a circular hole 58 is used as the mold for the wall 19. Brackets 60 are fixed to the outer periphery of the circular hole 58 at four positions with bolts 62. Here, the cylindrical pipe 64 as a box-extracting material for forming the manhole 56 is before assembling the reinforcing bars of the wall 19 (see FIG. 4).
Then, attach it to the specified position with the reinforcing bar. This cylindrical pipe 6
The vertical surface portion of the reinforcing channel material 66 is pressed against the inner peripheral surface 64A of 4 (see FIG. 12B), and both ends of the channel material 66 are fixed to the bracket 60 with bolts 68. In addition, the channel material 66 has a shape shown in FIG.
As shown in (B), they are evenly arranged at four places.

Here, when the concrete of the wall 19 is cast, the concrete does not flow into the portion of the cylindrical pipe 64 and the cylindrical pipe 64 is not deformed, so that the manhole 56 with high precision is formed. .. The cylindrical pipe 64 is removed together with the support pipe 36 described above after the concrete of the wall 19 is hardened.

[0026]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned structure, the process of assembling the formwork can be simplified, and the work of removing and removing the formwork is eliminated and the construction period of the concrete structure can be shortened.

[Brief description of drawings]

FIG. 1 is a side view showing a construction procedure of a construction method for a concrete structure according to the present invention.

FIG. 2 is a side view showing a construction procedure of a construction method for a concrete structure according to the present invention.

FIG. 3 is a side view showing a construction procedure of a construction method for a concrete structure according to the present invention.

FIG. 4 is a side view showing a construction procedure of a construction method for a concrete structure according to the present invention.

FIG. 5 is a side view showing a construction procedure of a construction method for a concrete structure according to the present invention.

FIG. 6 is a side view showing a construction procedure of a construction method for a concrete structure according to the present invention.

FIG. 7 is a side view showing a construction procedure of a construction method for a concrete structure according to the present invention.

FIG. 8 is a side view showing a construction procedure of a construction method for a concrete structure according to the present invention.

FIG. 9 is a side view showing an underground pit constructed by the method for constructing a concrete structure according to the present invention.

FIG. 10 is a perspective view showing a precast mold used in the method for constructing a concrete structure according to the present invention.

FIG. 11 is a side view showing a support pipe used in the method for constructing a concrete structure according to the present invention.

FIG. 12 (A) is a perspective view showing a construction state of a manhole constructed by the construction method for a concrete structure according to the present invention, and (B) is a construction diagram for the construction method for a concrete structure according to the present invention. It is a top view which shows the construction condition of the opened manhole.

[Explanation of symbols]

 30 Angle Material 34 Precast Formwork 36 Support Tube 64 Cylindrical Pipe (Unboxing Material) 66 Channel Material (Reinforcement Material)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kaichi Murakami 8-21-1, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Yoshio Nakajima 8-chome, Ginza, Chuo-ku, Tokyo 21 No. 1 Incorporated Takenaka Corporation Tokyo Main Store (72) Inventor Tetsuya Nakajima 8-21-1, Ginza, Chuo-ku, Tokyo Incorporated Takenaka Corporation Tokyo Main Store (72) Inventor Yosuke Sato Chuo-ku, Tokyo 8-21-1 Ginza Stock Company Takenaka Corporation Tokyo Main Store

Claims (2)

[Claims] 1. A method for constructing a concrete structure integrally constructed with a wall rising from a base surface and a slab supported by the wall, a plate having a flat surface and a wavy continuous projection provided on the back surface. The lower end of the precast mold in the shape of a block is temporarily fixed by a temporary fixing member fixed to the base surface of the concrete structure, and the precast mold is built so that its back surfaces face each other. A first step of forming a formwork, a second step of supporting the surface of the precast formwork with a support material to prevent entrapment of the precast formwork, and a third step of placing concrete on the wall And, after hardening the concrete for the wall, remove the support material, precast to the upper end of the precast mold, and to the upper end of another precast mold to build the adjacent wall. Having a fourth step of bridging the formwork with its back surface facing upward, and a fifth step of placing concrete on the precast formwork frame that has been laid and used as a slab formwork. A method for constructing a concrete structure, characterized by: 2. In the first step, a precast mold having a circular hole is built in, and the outer peripheral surface of a box-punching material for forming a through hole in the wall and the inner peripheral surface of the circular hole are the same. A method of constructing a concrete structure, characterized in that the surface is a surface, and a reinforcing material that comes into contact with the inner peripheral surface of the box-cut material to prevent deformation of the box-cut material is attached.