JP4606603B2 - Method for constructing formwork for concrete wall and steel formwork used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a concrete wall formwork having a certain height and width, such as a regulating pond, a retaining wall, a water channel, and the like, which are installed when building a residential land, and a steel formwork used therefor.
[0002]
[Prior art]
In recent years, steel formwork is generally used as a formwork for concrete work. Standard specifications of steel molds are standardized by JIS A 8652 “Concrete Formwork Panels”.
FIG. 7 is a perspective view showing the steel mold 1, 11 is a face plate, 12 is a vertical rib provided at the left and right edges, 13 is a horizontal rib provided at the same upper and lower edges, and 14 is an interior thereof. Inner ribs 15 provided vertically and horizontally are clamp holes 15 provided at appropriate intervals in the vertical ribs 12 and the horizontal ribs 13. In addition, although not shown, a lifting hole, a drain hole, and the like are appropriately provided in the rib and the face plate.
[0003]
For example, in order to construct a concrete wall with a certain height and width to be provided in a regulating pond, retaining wall, waterway, etc., which is installed at the time of residential land development, such a rectangular steel formwork is flattened horizontally and vertically. In combination with the above, a concrete mold for a concrete wall is formed, and a pair of molds are set up facing each other at an interval corresponding to the thickness of the wall, and concrete is poured and cured inside thereof.
[0004]
Since the clamp hole 15 for assembly is provided around the steel formwork, it is easy to assemble into a flat formwork form using clamp members such as pins, bolts, clips, etc. Since the vertical and horizontal seams are both in a straight line, some bending is likely to occur at the joints, and the weight of the steel formwork, the weight of the concrete, wind power, etc. In order to maintain the correct flat state against vibrations and vibrations, a support member such as a steel pipe or a steel beam is required to support the steel mold from the back side.
[0005]
This will be described with reference to FIG. This figure is a side view of an assembled mold frame showing a state in which steel molds combined in a plane are facing each other, where 1 is a steel mold frame and 2 is a distance between steel mold frames on both sides. 4 and 5 are steel pipe support members that are attached to the back side of the steel mold 1 in the vertical and horizontal directions with respect to the wall, and 4 is a vertical flutter (batter, square member), 5 Similarly, it is a horizontal horizontal flap.
[0006]
The construction procedure is as follows. First, the steel molds 1 on both sides of FIG. 8 are assembled into a planar shape while inserting bolts, pins, clips, etc. into the surrounding clamp holes 15, and the vertical butterfly 4 and horizontal flaps are placed on the back side. 5 is assembled into a lattice shape, and the steel mold 1 is sequentially locked to the vertical butterfly 4 or the horizontal butterfly 5 by a foam tie or the like.
An example of a structure in which the steel mold 1 is locked to the vertical butterfly 4 or the horizontal butterfly 5 is shown in FIG. This figure is a partial perspective view showing a state in which the steel mold 1 is fixed to the vertical butterfly 4 or the horizontal butterfly 5 with a foam tie 9, and 91 is a fixing called a wing used when there are two butter materials. It is a metal fitting.
[0007]
On the other hand, FIG. 10 is a side view showing a steel metal frame connecting bracket described in registered utility model No. 3063665, and FIG. 11 is a plan view of the same. The connecting bracket 21 is composed of a plate-like portion 211 provided with a pin hole 212, a rod-like portion 213 connected to the pin-like portion 212, and a cone 214 screwed into the rod-like portion 213, and a screw hole 216 is formed in the rod-like portion 213. Has been. 12 is a perspective view with the cone 214 removed, and FIG. 13 is a cross-sectional view of the cone 214. The external thread 215 to which the cone 214 is attached is an unusual right-hand thread.
[0008]
FIG. 14 is a partial cross-sectional view of the separator part of the assembly form using this connection fitting 21. The connection fitting 21 is attached to both sides of the separator 2 with screws cut at both ends, and the upper and lower steel molds 1 are connected. The plate-like portion 211 of the connection fitting 21 is sandwiched between the portions, and the U clip 8 fixes the clamp holes of the upper and lower steel molds 1 and the pin holes 212 of the connection fitting 21 in an overlapping manner. .
[0009]
When the concrete is hardened, the U-clip 8 is removed, the steel mold 1 is disassembled, and the connecting bracket 21 is removed by twisting. As a result, the cone 214 is recovered together with the connecting bracket 21 because of the right-handed connection. Only remains in the concrete.
[0010]
[Problems to be solved by the invention]
By the way, this conventional method has the following problems.
1) Since the steel molds are assembled and assembled one by one on the butter material erected in a lattice shape, not only manpower and work time are required, but also the work is a high place, so there is a great danger.
2) In the mounting structure shown in FIG. 9, the face plate 11 is deformed when the foam tie is tightened to the full extent, so that skill is required for proper tightening.
3) Although the problem of 2) above is eliminated with the mounting structure of FIG. 14, there is a gap around the thickness of the plate-like portion 211 of the connecting bracket 21 at the joint where the separator is inserted. Measures to prevent this are necessary.
[0011]
An object of the present invention is to solve such problems and to realize an efficient construction method of an assembled mold for building a wall body, and to provide a steel mold suitable for this. .
[0012]
[Means for Solving the Problems ]
[0013]
The present invention described in claim 1
Construction of a concrete formwork frame for concrete walls in which steel formwork with ribs for connection around it in a substantially quadrilateral shape are connected vertically and horizontally, facing each other at intervals equivalent to the wall thickness. In the method
A normal stage in which the assembled formwork is connected to a steel formwork of a standard length in the lateral direction ;
In the middle, the plate-like portion of the separator fitting (21) is attached to the part of the clamp hole (15) of the upper and lower lateral ribs (13) where the separator (2) is attached in the steel mold of the standard length. 211), a steel mold (1a) formed with a recess (16) having a width and depth corresponding to the width and thickness of the plate is connected continuously in the lateral direction, and both ends of the steel mold (1a ) Using a steel formwork (1b) whose lateral length is half that of the steel plate (1b). The concrete form for the concrete wall, which is formed by connecting only the longitudinal support members to the steel formwork and standing on one side of the concrete wall,
The normal stage and the special stage are alternately combined in the vertical direction at positions facing the assembly form frame and the interval corresponding to the thickness of the concrete wall, and the predetermined concrete wall height is divided into a plurality of units in the vertical direction. was assembled in stages, the back surface laterally supporting members only arranged to features and to Turkey Nkurito walls that each steel mold formed by combining a concrete wall set formwork Yuku sequentially stacked on each of the units This is a method for constructing an assembled formwork.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The features of the present invention can be summarized in the following two points.
1) Prepare a steel mold half that is half the length of the standard one, use it at both ends, and assemble it so that it is half-shifted in the length direction at the upper and lower steps like brickwork. As a result, the rigidity of the material can be improved, the butter material can be simplified, and it can be assembled on the ground beforehand and installed at once.
2) Because the ribs of the steel formwork where the separator is to be attached are provided with recesses, the separator can be attached even after the steel formwork is assembled into a plane, and there is no gap at the seam, so it is necessary to close it. There is no.
[0017]
【Example】
First, a novel steel mold used in combination with a conventional one in the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the steel mold 1a, and FIG. 2 is a partial perspective view showing an A portion thereof in an enlarged manner. This steel mold 1a is basically the same as the conventional steel mold 1 shown in FIG. 7, but the position of the separator mounting position in the clamp holes 15 provided in the upper and lower horizontal ribs 13. The difference is that the lateral ribs are slightly recessed to form the recesses 16.
[0018]
The distance between the separators is usually 600 mm in the vertical direction and 750 mm in the horizontal direction. Therefore, in the case of a steel mold having a length (width) of 600 mm and a width (length) of 1500 mm, the vertical direction is just right if a separator is arranged at each seam portion. In the lateral direction, the recesses 16 are formed by recessing the portion of the clamp hole 15 at two intermediate positions of the lateral rib 13 and 375 mm from both ends by about 2 to 3 mm from the surface, and this is the position of the separator. The depth to be recessed is a dimension corresponding to the plate thickness of the plate-like portion 211 of the separator coupling metal 21 described above, and the width to be recessed is a width corresponding to the width of the plate-like portion 211, for example, 45 mm.
[0019]
Next, an example will be described in which a wall having a height of 3,600 mm and a width of 9 m is constructed by using the above-mentioned steel molds 6 in length and 6 in width.
FIG. 3 is a side view of the assembled formwork showing a state in which the steel formwork combined in a flat shape in the construction of the concrete wall is faced up, and each reference sign is the same for the same thing as before. In addition to the use, 2a is a width stopper for connecting the steel molds 1 on both ends at the upper end, and 3 is a steel pier that is placed on a rooted ground and a flat steel mold is assembled thereon. .
[0020]
In the present invention, when combining the molds, the conventional steel mold 1 and the new steel mold 1a provided with the recesses are alternately used one by one in the vertical direction. For the special stage using the steel mold 1a, the steel mold 1 and the steel mold 1b whose length is half of the standard steel mold 1a are prepared. Used for.
FIG. 4 is a front view showing a main part of the _first assembly frame W ₁ erected from the pair of assembly frames. A special stage using only the conventional steel formwork 1 and a special stage using the new steel formwork 1a shown in FIG. Is assembled in a zigzag pattern with a half-pitch shift in the vertical direction using a steel mold 1b having a half lateral length only at both ends. By providing the recess at the position where the separator is attached, the vertical ribs can be joined without a gap. The separator can be inserted after the formwork is assembled.
[0021]
Further, since the joint surfaces are shifted by a half pitch vertically, the seam does not pass in the vertical direction as in the past, and bending is prevented, so that the horizontal flap can be omitted and only the vertical flap can be assembled. Therefore, conventional vertical Bata steel formwork as, instead of Yuku assembled erected transverse butter, assembled the whole set formwork W ₁ on the ground by utilizing the vacant etc., to carry it It is possible to stand up at once with a simple method such as two-point suspension. By the way, the weight of this size is about 980 kg.
[0022]
On the other hand, FIG. 5 is a front view showing a main part of the mating formwork W ₂ on the other side facing the formwork W ₁ in FIG. The side to be erected at first is assembled six steps at a time, but as will be described later, the side to be erected later is divided into three in the height direction and stacked in two steps. Therefore, for example, the upper stage is a normal stage, the lower stage is a special stage, and steel molds 1b having a half length are used at both ends. It is assembled on the ground using a vacant land etc., and a horizontal flap 5 is attached to the back side here. This is similar to the previous set of mold W _1, but bending is not at the seam to have shifted by half a pitch for every stage, and in order to prevent the large curvature, at least the uppermost and lowermost Install.
[0023]
FIG. 6 is an explanatory diagram showing the construction procedure of the assembled form frame of this embodiment. First, as described above, the assembled frame W ₁ on the side to be erected _first is assembled horizontally on a flat ground, vertically raised and transported to the planned installation position, and placed on the pier 3 as shown in (a). To do. The pier 3 has a clip hole on its upper surface. This is previously installed at a predetermined position. Here, although omitted in this figure, the pipe support 6 and the tension chain 7 as shown in FIG.
[0024]
Next, in the horizontal direction by a predetermined distance at a seam portion between the bottom and the second stage to set formwork W ₁ (b), the i.e. attaching the separator 2 for each recess. Subsequently, as shown in (c), _two pairs of assembled frames W2 on the other side are installed, and the separator 2 is connected thereto.
Then the third stage of the set mold W ₁ as shown in (d), a separator 2 mounting four-stage, two stages of pairs formwork W ₂ (e), the ie the third stage, The fourth stage is installed and the separator 2 is connected to this. After it becomes the state shown in FIG. 3 By installing 5,6-stage separator 2 and set formwork W ₂ as shown in the same procedure (f), set formwork is completed.
[0025]
Here, the assembly of the mating formwork W ₂ on the other side was divided into two steps. In the case of this steel formwork, the vertical dimension (width) is 600 mm. This is because the work cannot be performed at a height higher than this when connecting the inner separator and the like.
Here, the effects M of the present invention are summarized as follows.
1) Since the separator can be inserted after the formwork is assembled, the work is easy.
2) Even if the molds are assembled together and hung with two wires, the molds do not collapse or loosen.
3) The weight of the assembled formwork is less than half that of the conventional one.
4) By simply pulling out the U clip or pin, the mold can be removed without loosening the nut.
[0026]
【The invention's effect】
According to the present invention, first, the butter material is composed of only one vertical flutter in one assembled formwork, and only the horizontal flutter on the other, and both are assembled with the steel formwork in advance on the ground, so that the work is easy and safe. , One assembled formwork can be installed in one time, and the other assembled formwork can be installed in two steps in two steps, so the construction work of the assembled formwork is extremely efficient, steel formwork Since there is no gap in the joint, there is an excellent effect that the concrete wall work can be performed very efficiently by eliminating the need for a work to close the seam, and by the easy dismantling work such as demolding.
[Brief description of the drawings]
FIG. 1 is a perspective view of a steel mold used in the present invention.
2 is an enlarged partial perspective view showing a portion A of FIG. 1; FIG.
FIG. 3 is a side view showing the assembled mold frame of the present invention.
FIG. 4 is a front view showing the main part of the one-side assembled mold frame of the present invention.
FIG. 5 is a front view showing a main part of the assembled frame on the other side of the present invention.
FIG. 6 is an explanatory diagram showing a construction procedure of the assembled form of the present invention.
FIG. 7 is a perspective view showing a steel mold frame generally used in the past.
FIG. 8 is a side view of an assembled mold frame showing a conventional technique.
FIG. 9 is a partial perspective view of an assembled mold frame showing a locking structure of a steel mold frame in the prior art.
FIG. 10 is a side view showing a steel metal frame fitting in the prior art.
FIG. 11 is a plan view showing a steel metal frame connecting bracket in the prior art.
FIG. 12 is a perspective view showing parts of a connecting member of a steel mold frame in the prior art.
FIG. 13 is a cross-sectional view showing parts of a connecting member of a steel mold in the prior art.
FIG. 14 is a partial cross-sectional view of an assembled mold frame in the prior art.
[Explanation of symbols]
1, 1a, 1b Steel formwork 2 Separator
2a Width stop hardware 3 Pier 4 Vertical flap ( longitudinal support member)
5 Horizontal flap ( transverse support member)
6 Pipe support 7 Pull chain 8 U clip 9 Foam tie
11 faceplate
12 Vertical rib
13 Horizontal rib
14 Medium rib
15 Clamp hole
16 recess
21 Connecting bracket
91 Wing
211 Plate
212 pin hole
213 Bar
214 corn
215 External thread
216 Screw hole C Concrete W ₁ and W ₂ assembled formwork

Claims (1)

Construction of a concrete formwork frame for concrete walls in which steel formwork with ribs for connection around it in a substantially quadrilateral shape are connected vertically and horizontally, facing each other at intervals equivalent to the wall thickness. In the method
A normal stage in which the assembled formwork is connected to a steel formwork of a standard length in the lateral direction ;
In the middle, the plate-like portion of the separator fitting (21) is attached to the part of the clamp hole (15) of the upper and lower lateral ribs (13) where the separator (2) is attached in the steel mold of the standard length. 211), a steel mold (1a) formed with a recess (16) having a width and depth corresponding to the width and thickness of the plate is connected continuously in the lateral direction, and both ends of the steel mold (1a ) Using a steel formwork (1b) whose lateral length is half that of the steel plate (1b). The concrete form for the concrete wall, which is formed by connecting only the longitudinal support members to the steel formwork and standing on one side of the concrete wall,
The normal stage and the special stage are alternately combined in the vertical direction at positions facing the assembly form frame and the interval corresponding to the thickness of the concrete wall, and the predetermined concrete wall height is divided into a plurality of units in the vertical direction. was assembled in stages, the back surface laterally supporting members only arranged to features and to Turkey Nkurito walls that each steel mold formed by combining a concrete wall set formwork Yuku sequentially stacked on each of the units Construction method for assembly formwork.

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