JP3390719B2 - Concrete formwork construction method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to concrete
The present invention relates to a concrete formwork construction method that improves work efficiency and safety when constructing a concrete formwork for concrete placement after the first time. 2. Description of the Related Art Conventionally, in order to construct a concrete structure such as a sabo dam, for example, a member called a metal foam 1 is formed on a form support 2 as shown in FIG. The concrete form 11 is formed by arranging along the lines and fixing with the hook bolts 6. And the metal form 1
The anchor member 4 having one end attached to the base portion is attached to the side of the fixed member 3 facing the concrete placing space S of the concrete form 11, and the concrete form 11 is attached to the concrete wall surface. A concrete retaining wall is built upright at a predetermined position so as to form a concrete retaining wall. After that, concrete is poured and hardened. If the concrete structure is huge, it is difficult to finish it into a predetermined shape at once because of the amount of materials used, so the first stage C1 following the foundation C0 (displayed in phantom lines)
Then, after a certain curing period has elapsed, a second-stage concrete retaining wall is constructed above the first-stage C1, and the second-stage is constructed. Thereafter, this construction method is repeated ( The second and subsequent stages are not shown). The anchor member 4 is connected to the metal foam 1 and the form support 2 by attaching a fixed washer 3 to a face plate of the metal foam 1 and attaching the anchor member 4 to a portion of the fixed washer 3 on the concrete placing space S side. After joining, a form tie 7 for fixing to the metal form 1 and the formwork column 2 is screwed to a portion opposite to the concrete casting space S, and fixed with a nut and a washer. The fixed washer 3 and the anchor member 4 which has been previously caught and embedded are connected by a telescopic joint 8 so as to maintain the required inclination of the concrete form 11. [0004] In the above-mentioned conventional method, when forming a mold in the next and subsequent stages, the mold is temporarily removed from the hardened concrete in the previous stage and dismantled, and then the concrete in the next and subsequent stages is formed. Since the lowermost concrete form 11 of the form is connected to the previous concrete placing surface, the gap is formed between the next concrete form 11 and the previous concrete placing surface, and the uncured concrete form 11 is formed. When concrete is poured, there is a drawback that water or paste flows into the gap and the finished state of the wall surface at the boundary of each step is poor. Further, when constructing the molds at the next and subsequent stages, it takes a great deal of trouble to level and form the molds for arranging the plurality of metal forms 1 in the horizontal direction, which is one of the causes of lowering the work efficiency. At the same time, there were safety issues to be solved. [0005] Therefore, the present invention provides a large amount of work for constructing the formwork of the conventional concrete formwork,
Provided is a concrete formwork construction method capable of solving various problems such as a decrease in safety and work efficiency caused by a structure and a construction method of a construction member, and a poor appearance of a separately cast and cast surface. For the purpose. Means for achieving the above object will be described with reference to the drawings showing the embodiment and common reference numerals. The concrete formwork construction method of the present invention is a concrete casting method. A plurality of metal foams 1 vertically arranged facing the space S, and connecting metal fittings 6 erected outside the metal foams 1.
Form support 2 for maintaining these metal foams 1 in a predetermined posture via a buckle, and a tension connecting member 3 stretched between the metal foam 1 and the anchor member 4 on the concrete placing space S side. Concrete formwork construction method, wherein the metal form 1 arranged in a plurality of stages,
In a state where at least the uppermost metal foam 1 is connected to the anchor member 4 via the tension connector 3, uncured concrete C is poured into the space S and hardened to a predetermined hardness. A mold that uses multiple metal forms 1 in the second and subsequent stages for the previous stage , leaving the metal form 1
In the state where it is connected to the frame support 2, it is peeled off from the concrete surface and the lowermost stage connected to the form support 2 is removed .
It required anchoring member as well as set the metal foam 1 of the next step the <br/> metal foam 1 uppermost still leaving a metal foam 1 into the concrete surface as the fixed frame 4
Then, the above steps are sequentially repeated. DESCRIPTION OF THE PREFERRED EMBODIMENTS In carrying out the present invention,
For the metal form 1 and the form support 2 (referred to as the main pillar at the work site), a normal product is used.
Is connected to the form support 2 by the connection fitting 6 to form a panel-shaped concrete form 11, and the uppermost metal form 1 of the concrete form 11 and the anchor member 4 are connected by the tension connection 3. This tensioned connecting member 3 is composed of an inner connecting member 3a, an outer connecting member 3b, an inner connecting member 3a and an anchor member 4 which can be divided by screwing into the concrete placing space S side and the opposite side. The joint 3c to be connected and the joint 3d to connect the outer connecting member 3b and the form support 2
Consists of Concrete placing space S of the tension connector 3
On the side, an anchor member 4 is provided via a joint 3c,
One end of the foam tie 3d is connected to the opposite side, and the other end of the foam tie 3d is fixed to the form post 2 with a washer and a nut. Concrete is poured in this state,
In order to prepare for the next stage of concrete placement, the extendable anchor member 4 is embedded in a state where the head is caught by the turnbuckle 4a. Reference numeral 9 denotes a scaffold support frame fixed to the form support 2. After the concrete has hardened and a certain curing period has elapsed, the connecting metal fitting 6 connecting the uppermost metal foam 1 and the formwork column 2 is removed from the metal foam 1, and a tensioned connecting metal is used. 3, the foam tie 3 d is connected to the outer connector 3 b
Then, the panel-shaped concrete form 11 is separated while leaving the metal foam 1 at the top. Since the uppermost metal form 1 is fixed by the anchor member 4 and the inner connecting member 3a and the outer connecting member 3b of the tension connecting member 3, it remains without leaving the cast concrete surface and is separated from the concrete form. Reference numeral 11 denotes a chain block or a crane that pulls up the entire formwork, successively installs the lowermost metal form 1 on the uppermost metal form 1 and connects it to the anchor member 4 to be buried in concrete in the future. . A tension connector 3 is provided on the metal foam 1 at an appropriate intermediate position between the uppermost stage and the lowermost stage.
And the anchor member 4 embedded in the crawled state is connected by a joint 3c having a continuous connection hole, the position of the connection hole is changed, and the turnbuckle 4a of the anchor member 4 is adjusted. Then, the inclination of the concrete formwork 11 is changed to maintain the concrete form 11 in a predetermined posture. According to the above-mentioned construction method, when constructing the next concrete form 11, the concrete form 11 used in the previous construction is used as it is, so that the work and time required for reassembly can be reduced significantly. it can. In some cases, the initial mold assembly can be performed on a flat surface, so that the work is easy and safe. next,
When constructing the next-stage concrete form 11, the metal form 1 which was the uppermost step at the beginning is left on the hardened concrete to serve as a fixed form as the fixed form 11 in the next step.
Because it is assembled, there is no need to consider the horizontal level and continuity of the new frame, and it is extremely easy to install because it does not need to go through the work. It is possible. In the second and subsequent steps, the metal foam 1, which was the uppermost step of the concrete form 11 of the previous step, remains on the cast concrete surface without being removed. When there is no gap between the metal form 1 and the unhardened concrete is poured into the newly constructed concrete form 11, water and paste do not flow into the gap. The finished condition of the wall surface at the boundary is very good. Furthermore, by adopting a washer that is fitted to the bolt portion of the coupling portion of the divided tension coupling device 3 and is free, only the nut portion is loosened when the tension coupling device 3 is removed. It has a feature that the nut portion can be easily removed without damaging the nut.
Furthermore, since the concrete formwork 11 is displaced in a stepwise manner and is constructed efficiently, there is an effect that the number of parts used can be reduced in the whole construction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is a sectional view illustrating the structure of the first embodiment,
FIG. 2 is an enlarged cross-sectional view of a main part, and FIGS. 3 and 4 are cross-sectional views for explaining the details of the method according to the order. FIG. 1 is a cross-sectional view for explaining the structure of a concrete formwork 11 in a state where concrete has not been poured in the second and subsequent steps. In the same figure, unfilled concrete C is indicated by a one-dot chain line. FIG. 2 is an enlarged sectional view of a main part. Referring to FIGS. 1 and 2, the concrete form 11 is in a state where a plurality of metal forms 1 are arranged on the form support 2. The panel is formed by being connected by the connection fitting 6. Metal Form 1 is shaped like a shallow box,
A reinforcing frame 1b having a width W is formed upright on an outer periphery of a concrete receiving plate 1a corresponding to a bottom plate of a box. As shown in FIG. 2, a hole 1c is formed in the reinforcing frame 1b,
Holes 1c of the adjacent metal form 1 arranged along
And hook the hook-like portion at one end of the connection fitting 6, and fix the other end to the form support 2 by screwing. In addition, 9 is a scaffold support frame. A tension connection that can be divided into two parts, an inner connection tool 3a and an outer connection tool 3b, which are respectively located on the concrete casting space S side and on the opposite side, to the uppermost metal form 1 of the concrete formwork 11. Fixture 3 on concrete receiving plate 1a
The anchor member 4 to be buried after the concrete is cast is attached to the inner connecting tool 3a of the tension connecting tool 3 on the side of the concrete casting space S, and the outer connecting tool 3b is mounted on the opposite side. Is connected to one end of the form tie 3d, and the other end of the form tie 3d is fixed to the form post 2. In FIG. 3, uncured concrete is poured into the concrete casting space S of the concrete form 11 constructed as described above, and after curing for a predetermined period, the uppermost metal foam 1 (FIG. 3, FIG. 3). (Indicated by a bold line on the surface in Fig. 4)
And the concrete form 11 is separated, and the separated concrete form 11 is used as a second form, and the lowermost metal form 1 is placed on the metal form 1 which was the uppermost in the previous step. Subsequently, the metal foam 1d is used as a fixed frame to assemble the metal foam 1 in the next step, and is connected to the required anchor member 4. For this purpose, as shown in FIG. 3, the connecting metal fitting 6 connecting the uppermost metal form 1 and the form support 2 is removed from the metal form 1, and then the form tie 3d connected at one end is removed. Metal foam 1 simply by removing it from the external connector 3b
Will remain fixed to the concrete surface by the tension connector 3 and the anchor member 4 and will be separated from the concrete form 11. Next, as shown in FIG. 4, the separated concrete form 11 is rebuilt as a second-stage form. At this time, the outer connecting member 3b is connected to the reinforcing frame 1 of the metal foam 1.
By setting the dimensions so as not to protrude from the upper end edge of b, it is possible to avoid a situation in which the separated concrete form 11 is caught by the outer connecting tool 3b and hinders the work when moving. Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only the structures of these embodiments, but includes the structural requirements according to the present invention and refers to the present invention. The present invention can be implemented by appropriately modifying it within the range of achieving the object and having the following effects. As is apparent from the above description, the concrete form construction method according to the present invention hardens the metal foam that was initially the uppermost step when constructing the next concrete form. Leave on the concrete and raise the metal foam of the second stage or less away from the concrete surface while being connected to the form support, and lift the metal form of the lowermost stage connected to this form support. Since the metal foam for the next process is assembled with it placed on top of the metal foam that has been left on the concrete surface, there is no need to consider the horizontality and continuity etc. of the next formwork in the left and right direction. No assembly work is required, making assembly extremely easy and extremely safe. It has the effect of saying. In the second and subsequent steps, the metal foam, which was the uppermost step of the former concrete formwork, remains on the previous concrete surface without being removed and becomes a fixed frame having a guiding action. When there is no gap between the fixed form metal foam and uncured concrete, water and paste do not flow into the gap between the concrete surface inside the newly constructed concrete form and the concrete surface as in the past. In addition, it is possible to obtain the effect that the finished state of the wall surface at the boundary of each step is extremely good.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view for explaining the structure of a first embodiment. FIG. 2 is an enlarged sectional view of a main part of the same. FIG. 3 is an explanatory view of a step of separating a metal form and a concrete formwork. FIG. 4 is an explanatory view showing the relocation and rebuilding of the separated concrete formwork. FIG. 5 is a sectional view for explaining the structure of a conventional example. [Explanation of Signs] 1 Metal foam 2 Form support 3 Tension connection tool 4 Anchor member 6 Connection fitting 9 Scaffold support frame 11 Concrete form

Claims (1)

(57) [Claims] [Claim 1] A metal foam (1) arranged in a plurality of stages in the vertical direction facing a concrete casting space (S), and a connecting metal fitting ( 6), form supports (2) for maintaining the metal foam (1) in a predetermined posture, and the metal foam (1) and the anchor member ( 4) a concrete formwork construction method comprising a tension connector (3) stretched between the metal foam (1) , at least the uppermost metal foam of the plurality of metal foams (1) arranged With (1) connected to the anchor member (4) via the tension connector (3), the uncured concrete (C) is poured into the space (S) and hardened to a predetermined hardness, Form supports (2) using a plurality of second and subsequent metal forms (1) for the construction of the previous stage , leaving the uppermost metal foam (1 )
It was peeled off from the concrete surface in a state linked to the metal of the lowermost remains connected with the mold support column (2)
While the foam (1) is left on the concrete surface, the top metal foam (1) is set as a fixed frame on the metal foam (1) of the next process and the required anchor member (4)
A concrete formwork construction method that is connected to a concrete form and repeats the above steps sequentially.