JP2019189999A - Form for slit formation and slit formation method - Google Patents

Abstract

To provide a form for slit formation and a slit formation method allowing easy and quick form removal work, by allowing easy and quick removal of a slit formation member.SOLUTION: A form for slit formation has two slit forming formwork plates 1, 2 forming a pair of slit internal wall surfaces on a concrete wall and slit formation members 3, 4 set therebetween. The two slit forming formwork plates 1, 2 comprise front side protruding parts F1, F2 protruding to a front side of the concrete wall and rear side protruding parts R1, R2 protruding to a rear side, and the slit formation members 3, 4 are set between the front side protruding parts F1, F2 and between the rear side protruding parts R1, R2. A slit formation method uses the form.SELECTED DRAWING: Figure 1

Description

  The present invention includes a pair of slit mold plates that form a pair of slit inner wall surfaces facing each other in the surface direction of the concrete wall, and a gap forming member interposed between the two slit mold plates. The present invention relates to a slit forming mold and a slit forming method using the slit forming mold.

In such a slit forming form, when the gap forming member is removed at the time of demolding after placing and curing concrete, a gap is formed between the two slit form plates. Therefore, it is possible to easily remove the two slit form plates using the gap.
Conventionally, the gap forming member is formed in a larger area than the slit mold plate, and a part of the gap forming member protrudes between the two slit mold plates to the front side and the rear side in the thickness direction of the concrete wall. What is comprised so that it may be easy to remove a clearance gap formation member using the protrusion part is known (for example, refer patent document 1).

Japanese Patent Laid-Open No. 2006-79731

  However, in the prior art described in the above-mentioned document, a large pressure acts on the two slit mold plates during concrete placement, and the gap forming member is sandwiched between the two slit mold plates with a strong force. It will be. Therefore, although a part of the gap forming member protrudes between the two slit mold plates, there is a difficulty in removing the gap forming member, and there is room for improvement in this respect.

  The present invention pays attention to such a conventional problem, and the purpose thereof is to allow the gap forming member to be easily and quickly removed, thereby facilitating and speeding up the demolding operation. The object is to provide a slit forming form and a slit forming method.

  The first characteristic configuration of the present invention is interposed between two slit mold plates that form a pair of slit inner walls facing each other in the surface direction of the concrete wall, and the two slit mold plates. A slit forming mold having a gap forming member, wherein the two slit mold plates are arranged in front of the concrete wall over the entire length of the inner wall of the slit in the thickness direction of the concrete wall. A front projecting portion projecting to the side and a rear projecting portion projecting to the rear side, and the gap forming member extends between the front projecting portions and the rear side over the entire vertical length of the inner wall surface of the slit. It exists in the point interposed between each protrusion part.

According to this configuration, the two slit mold plates are provided with a front-side protruding portion that protrudes toward the front side of the concrete wall and a rear-side protruding portion that protrudes toward the rear side, and the gap forming member protrudes toward the front side. Since it is interposed between the parts and between the rear side protruding parts, respectively, cut at least one of the front side protruding part and the rear side protruding part, or use at least one of tools such as a bar. It is possible to easily and quickly remove the interstitial gap forming member between the projecting portions, thereby creating a desired gap between the two slit mold plates.
Therefore, it is possible to easily remove and remove the two slit mold plates using the gap, and remove the interposed gap forming member at both the front side protruding portion and the rear side protruding portion. In some cases, the demolding operation is easier and faster.

  According to a second characteristic configuration of the present invention, in the two slit mold plates, an easily breakable deflection preventing member is interposed in a space between portions corresponding to the inner wall surface of the slit.

According to this configuration, in the two slit mold plates, the breakage prevention member that is easy to break is interposed in the space between the portions corresponding to the inner wall surface of the slit. It is possible to prevent the slit mold plate from being bent and to form a slit having a desired shape.
And, since the deflection preventing member is made of a material that can be easily broken, such as a polystyrene foam, a tool such as a bar is inserted through the gap after the gap forming member is removed, and it is easily broken and quickly removed. be able to.

  According to a third characteristic configuration of the present invention, the two slit mold plates are divided into a plurality of portions in the vertical direction of the inner wall surface of the slit, and the divided surfaces are separated from each other to insert the connecting reinforcing bars. The gap is provided.

According to this configuration, the two slit mold plates are divided into a plurality of parts in the vertical direction, and the reinforcing bar insertion gap is provided between the split surfaces so that the connecting reinforcing bars are arranged. The line becomes easy. The rebar insertion gap extends to the front and rear projecting end portions of the two slit mold plates, so a tool such as a bar is inserted from the rebar insertion clearance near the end portions. Thus, the gap forming member can be forcibly pulled out and removed.
Therefore, cutting at least one of the front-side protruding portion and the rear-side protruding portion to remove the gap forming member also uses the reinforcing bar insertion gap without cutting the protruding portion on the front side or the rear side. It is also possible to pull out and remove the gap forming member.

  According to a fourth characteristic configuration of the present invention, in the two slit mold plates, an easily breakable deflection preventing member is interposed in a space between portions corresponding to the inner wall surface of the slit, and the deflection preventing member is It is in the point where the connecting rebar penetrates.

According to this configuration, in the two slit mold plates, the breakage prevention member that is easy to break is interposed in the space between the portions corresponding to the inner wall surface of the slit. It is possible to form the slit of the desired shape, and the connecting rebar penetrates the deflection preventing member, so that the connecting reinforcing bar can be held by the deflection preventing member. Become.
And, since the deflection preventing member is made of a material that can be easily broken, such as a polystyrene foam, a tool such as a bar is inserted through the gap after the gap forming member is removed, and it is easily broken and quickly removed. be able to.

  According to a fifth characteristic configuration of the present invention, the two slit mold plates are divided into a plurality of portions in a vertical direction with a dividing surface oblique to the vertical direction of the inner wall surface of the slit, and the divided surfaces are in contact with each other. There is in point.

  According to this configuration, the two slit mold plates are divided into a plurality of portions on the upper and lower sides with the oblique dividing surface with respect to the vertical direction of the inner wall surface of the slit, and therefore, at the time of demolding after removing the gap forming member In the case of pulling out the divided slit form plate, it can be pulled out while reducing the frictional force generated on the split surface by pulling it out to the front side or the rear side of the concrete wall in consideration of the pulling direction. As a result, it is possible to remove the mold easily and quickly.

  The sixth characteristic configuration of the present invention is that the concrete wall is constructed using the slit forming mold according to any one of claims 1 to 5, and then the front of the two slit mold plates. By cutting at least one of the side protruding portion and the rear protruding portion, the interstitial gap forming member is removed between the cut portions, and then demolded to form a slit in the concrete wall. In the point.

  According to the present configuration, at least one of the front-side protruding portion and the rear-side protruding portion of the two slit mold plates is cut, and the interstitial gap forming member is removed between the cut portions. Using the gap generated between the two slit mold plates, the two slit mold plates can be easily and quickly removed and removed to form a slit in the concrete.

The perspective view of the mold for slit formation by 1st Embodiment Cross-sectional plan view of slit forming mold according to the first embodiment Cross-sectional plan view of slit forming mold according to the first embodiment Cross-sectional plan view of slit forming mold according to the second embodiment Longitudinal side view of slit forming form according to the second embodiment Front view of a slit forming form according to another embodiment

First and second embodiments will be described with reference to the drawings with regard to a slit forming mold and a slit forming method according to the present invention.
(First embodiment)
As shown in FIGS. 1 and 2, the slit forming mold of the present invention includes two wall front mold plates 7a and 7b for forming a concrete wall W and two wall rear mold plates. For a concrete wall W arranged between 8a and 8b and constructed by placing concrete, for example, an earthquake-resistant slit S extending through the concrete wall W in the thickness direction Y and extending in the vertical direction is provided. To form.
Therefore, the two slit form plates 1 and 2 forming a pair of slit inner wall surfaces W1 and W2 facing each other in the surface direction X of the concrete wall W are provided.
In FIG. 1, it is assumed that there is a window or the like above the concrete wall W. Therefore, although the vertical height of the concrete wall W is illustrated to be relatively low, the vertical height of the concrete wall W is naturally quite high when there is no window or the like.

Each of the slit mold plates 1 and 2 is made of, for example, a wooden plate, and is divided into a plurality of slit inner wall surfaces W1 and W2 in the vertical direction, and in this embodiment, the slit is divided into two in the vertical direction. The faces are separated from each other. That is, one slit mold plate 1 is divided into an upper mold plate portion 1a and a lower mold plate portion 1b, and the dividing surfaces of both mold plate portions 1a and 1b are separated from each other. The other slit mold plate 2 is similarly divided into an upper mold plate portion 2a and a lower mold plate portion 2b, and the dividing surfaces of both mold plate portions 2a, 2b are separated from each other.
Each of the slit form plates 1 and 2 is a front side of the concrete wall W, more specifically, a front surface mold of the wall over the entire length in the vertical direction of the slit inner wall surfaces W1 and W2 in the thickness direction Y of the concrete wall W. Front side projecting portions F1 and F2 projecting to the front side of the frame plates 7a and 7b, and the rear side of the concrete wall W, more specifically, the rear side projecting to the rear side of the rear wall form plate plates 8a and 8b. Protrusions R1 and R2 are provided.

That is, the upper mold plate part 1a and the lower mold plate part 1b in the one slit mold plate 1 each have a front projecting part F1 projecting to the front side of the wall front mold plates 7a and 7b. And rear side protrusion site | part R1 which protrudes in the back side of the rear surface formwork boards 8a and 8b for walls is provided. Similarly, the upper mold plate portion 2a and the lower mold plate portion 2b in the other slit mold plate 2 also have a front projecting portion F2 projecting to the front side of the wall front mold plates 7a and 7b, respectively. And rear side projecting portions R2 projecting to the rear side of the rear wall mold plates 8a, 8b.
And in both the mold plates 1 and 2 for slits, the gap forming member 3 on the front side is interposed between the front side protruding portions F1 and F2 in the state extending over the entire length of the slit inner wall surfaces W1 and W2. The rear gap forming member 4 is interposed between the rear protruding portions R1 and R2. That is, the gap forming member 3 on the front side is disposed in front of the front frame form plates 7a and 7b for walls, and the gap forming member 4 in the rear side is disposed on the rear side of the rear mold frames 8a and 8b for walls. Is done.
The gap forming members 3 and 4 are made of, for example, a wooden square or a plate so that the gaps are not easily deformed by pressure generated by placing concrete.

Further, in the two slit mold plates 1 and 2, the divided surfaces of the upper mold plate portion 1a and the lower mold plate portion 1b of one slit mold plate 1 are separated from each other, and the other slit mold The dividing planes of the upper mold plate part 2a and the lower mold plate part 2b of the frame plate 2 are also separated from each other, and the separation space is set as a reinforcing bar insertion gap. Then, in the space between the portions corresponding to the inner wall surfaces W1 and W2 of the slit and corresponding to the reinforcing bar insertion gap, the deflection preventing member 5 made of an easily breakable material such as, for example, foamed polystyrene is used as necessary. Is installed.
That is, if there is little possibility that the two slit mold plates 1 and 2 will bend by the pressure from the concrete when placing the concrete, it is not necessary to interpose the deflection preventing member 5 in particular. However, when there is a large possibility of bending, or when it is desired to suppress the deflection even a little, this easy-to-break deflection preventing member 5 is interposed, and in this case, the connection for connecting the concrete wall W separated by the slit S The reinforcing bar 6 is disposed in a state of passing through the reinforcing bar insertion gap and penetrating the deflection preventing member 5.

Next, a slit forming method for forming the slit S in the concrete wall W using the slit forming form will be described.
As shown in FIGS. 1 and 2, the upper mold plate part 1 a and the lower mold plate part 1 b of one slit mold plate 1, and the upper mold form of the other slit mold plate 2. Two slit mold plates 1 and 2 are arranged in a state where a reinforcing bar insertion gap is formed on each of the divided surfaces of the plate portion 2a and the lower mold plate portion 2b.
And, between the front side protruding portions F1 and F2 of the slit mold plates 1 and 2, a front gap forming member 3 is interposed, and between the rear side protruding portions R1 and R2, A gap forming member 4 on the rear side is interposed.

Further, if necessary, a breakage prevention member 5 that can be easily broken is interposed between the two slit mold plates 1 and 2, and the connection reinforcing bar 6 is inserted into the reinforcement bar in a state of passing through the deflection prevention member 5. Insert through the gap. Although not shown, the reinforcing bar insertion gap, that is, the gap between the upper mold plate part 1a and the lower mold plate part 1b of one slit mold plate 1, and the other slit mold form. The gaps between the upper mold plate part 2a and the lower mold plate part 2b of the plate 2 are respectively closed by sticking a sealing tape or the like. Then, the entire mold is wrapped with a release sheet such as oil paper, and if necessary, a release agent is applied to the release sheet, and two wall front mold plates 7a and 7b and a wall It is placed and fixed between the rear mold plates 8a and 8b.
Various methods can be employed for fixing the formwork, and an example is shown in FIG. That is, the wall front mold plates 7a, 7b having the wooden piers A, B extending in the vertical direction are used as the wall front mold plates 7a, 7b, and similarly, the wall rear mold plates 8a, The rear panel form plates 8a and 8b having the wooden piers C and D extending in the vertical direction are used as 8b. Then, nails 10 are respectively struck in the surface direction X from the piers A and C, and the upper mold plate part 1a and the lower mold plate part 1b of the slit mold plate 1 and further the gap forming members 3, 4 Similarly, the nails 10 are respectively struck in the surface direction X from the piers B and D, and the upper mold plate part 2a and the lower mold plate part 2b of the other slit mold plate 2 are The gap forming members 3 and 4 are fixed to each other.

Thus, after fixing the slit mold plates 1 and 2 and the gap forming members 3 and 4 to the wall front mold plates 7a and 7b and the wall rear mold plates 8a and 8b, they are not shown. If necessary, a steel pipe for positioning the formwork is disposed outside the wall front mold plates 7a and 7b and the wall rear mold plates 8a and 8b, and the wall front mold plates 7a and 7b and the wall are arranged. A concrete wall W is constructed by placing concrete between the rear mold plates 8a and 8b.
When removing the slit forming mold, before or after removing the wall front mold plates 7a, 7b and the wall rear mold plates 8a, 8b, the two slit mold plates 1, 2 at least one of the front-side protruding portions F1 and F2 and the rear-side protruding portions R1 and R2, or by using a tool such as a bar, the front-side protruding portions F1 and F2 and the rear-side protruding portions R1 and R2 The interposed gap forming members 3 and 4 are removed between at least one of the two. In any case, by removing at least one of the gap forming member 3 on the front side and the gap forming member 4 on the rear side, a gap is formed between the two slit mold plates 1 and 2.
Therefore, a tool such as a bar can be inserted through the gap to break and remove the deflection preventing member 5, and by removing the deflection preventing member 5, the upper mold of the two slit mold plates 1 and 2. The frame plate portions 1a, 2a and the lower mold plate portions 1b, 2b can be easily removed. As a result, the earthquake-resistant slit S can be easily formed in the concrete wall W.

(Second Embodiment)
Next, a second embodiment of the slit forming form will be described. In order to avoid duplication, the description of the configuration described in the first embodiment is omitted by assigning the same reference numerals to the first embodiment. A configuration different from the form will be described.
In the first embodiment, in order to suppress the deflection of the slit mold plates 1 and 2, an example in which the easily breakable deflection preventing member 5 is interposed between the slit mold plates 1 and 2 is shown. In 2 embodiment, as shown in FIG. 4, the bending prevention member 5 is not interposed between the mold plates 1 and 2 for slits.
Referring to FIG. 4, for example, when forming a concrete wall W having a thickness of 180 mm, a veneer plate having a thickness of 9 mm is used as the mold plates 1 and 2 for the slit, and a gap forming member on the front side (inner side) is used. If a veneer plate with a thickness of 12 mm is used as 3 and a veneer plate with a thickness of 5.5 mm is used as the gap forming member 4 on the rear side (external side), the slit mold plates 1 and 2 may be bent by pressure from the concrete. Therefore, it is possible to carry out without using the deflection preventing member 5.

When the deflection preventing member 5 is not used, as shown in FIG. 4, it is in contact with one slit mold plate 1 and in contact with the inner wall front mold plate 7a as shown in FIG. As described above, the reinforcing bar holding member 11 made of an easily breakable material such as polystyrene foam is disposed over the entire length of the concrete wall W in the vertical direction. Then, the connecting reinforcing bar 6 is held by passing the connecting reinforcing bar 6 through the reinforcing bar holding member 11. The rebar holding member 11 may be a relatively thin member. In this case, as shown in FIG. 5, it is preferable to fix the connecting rebar 6 to the slit form plate 2 side using a gum tape G or the like.
In this 2nd Embodiment, since the vertical height of the concrete wall W is high, as shown in FIG. 5, each form plate 1 and 2 for slits is divided | segmented into three or more to the up-down direction, or more. The divided surfaces are separated from each other. That is, one slit mold plate 1 is divided into three parts 1a, 1b, 1c or more, and the other slit mold plate 2 is also divided into three parts 2a, 2b, 2c, or Dividing into the above, the dividing surfaces are separated from each other, the space between the divided surfaces is set as a reinforcing bar insertion gap, and the connecting reinforcing bar 6 is inserted.
In addition, regarding the slit forming method according to the second embodiment, instead of the deflection preventing member 5, the reinforcing bar holding member 11 is disposed, and after the concrete wall W is formed, the reinforcing bar holding member 11 is destroyed and removed, There is no particular difference from the first embodiment.

[Another embodiment]
(1) In the previous embodiment, the front-side protruding portions F1 and F2 of the slit mold plates 1 and 2 protrude forward from the wall front mold plates 7a and 7b, and the front gap forming member 3 shows an example in which the wall front mold plates 7a and 7b are arranged on the front side, but the front gap forming member 3 is not necessarily on the front side of the wall front mold plates 7a and 7b. There is no need to place it. That is, if it is the front side of the concrete wall W, it can be arranged closer to the concrete wall W side, and the same applies to the gap forming member 4 on the rear side.
That is, the front side protruding portions F1 and F2 protrude to the front side of the concrete wall W, the front gap forming member 3 is positioned on the front side of the concrete wall W, and the rear side protruding portions R1 and R2 However, it can also be arranged so as to protrude rearward from the concrete wall W and the rear gap forming member 4 is located rearward from the concrete wall W. However, in that case, the front mold plates 7a, 7b for walls or the rear mold plates 8a, 8b for walls are removed first, and then, for example, the front projecting portions F1, F2 or the rear projecting portions R1. , R2 is cut, and the gap forming members 3 and 4 are removed.

(2) In the first embodiment, between the divided surfaces of the upper mold plate portions 1a, 2a and the lower mold plate portions 1b, 2b of the two slit mold plates 1, 2, and the second embodiment In the embodiment, the example in which the reinforcing bar insertion gaps are formed between the three parts 1a, 1b, 1c and the parts 2a, 2b, 2c has been shown, but the concrete walls W separated by the slits S are connected by the connecting reinforcing bars 6. When there is no need to do this, it is not necessary to form such a reinforcing bar insertion gap, and therefore, the two or more slit mold plates 1 and 2 can each be formed of a single plate-like body.
However, if each of the slit mold plates 1 and 2 is formed of a single plate-like body, there is a difficulty in demolding. Therefore, as shown in FIG. This can be dealt with by dividing the line 9 vertically into a plurality. In other words, the two slit mold plates 1 and 2 are divided into a plurality of portions on the upper and lower sides of the slit inner wall surfaces W1 and W2 in the vertical direction, and the divided surfaces are brought into contact with each other. Thereby, at the time of demolding, each divided part can be easily slid in the direction indicated by the arrow in the figure, and the mold plates 1 and 2 for slit can be easily demolded.
Moreover, although the earthquake-resistant slit was shown as an example of the slit S, it is not restricted to the slit for earthquake-proof especially, For example, it can apply also in formation of the slit for seismic isolation, and other various slits. Therefore, regarding the slit S, various shapes and forms such as a wide one to a narrow one and a short one to a long one in the vertical direction are conceivable.

1, 2 Slit form plate 3, 4 Gap forming member 5 Deflection preventing member 6 Reinforcing bar F1, F2 Protruding part on the front side of slit form plate R1, R2 Protruding part on the rear side of slit form plate W Concrete wall W1, W2 Slit inner wall surface S Slit X Concrete wall surface direction Y Concrete wall thickness direction

Claims (6)

For forming a slit having two slit mold plates that form a pair of slit inner walls facing each other in the surface direction of the concrete wall, and a gap forming member interposed between the two slit mold plates A formwork,
The two slit mold plates project in the thickness direction of the concrete wall over the entire length in the vertical direction of the inner wall surface of the slit in the front side projecting portion projecting to the front side of the concrete wall and the rear side projecting to the rear side. With side protrusions,
A slit forming form in which the gap forming member is interposed between the front protruding portions and the rear protruding portions over the entire length of the inner wall surface of the slit in the vertical direction.   2. The slit forming form according to claim 1, wherein in the two slit form plates, an easily breakable prevention member is interposed in a space between portions corresponding to the inner wall surface of the slit.   The two slit mold plates are divided into a plurality of portions in the vertical direction of the inner wall surface of the slit, and the divided surfaces are separated from each other to provide a reinforcing bar insertion gap for inserting a connecting reinforcing bar. The slit forming mold described in 1.   In the two slit mold plates, an easily breakable deflection preventing member is interposed in a space between portions corresponding to the inner wall surface of the slit, and the connecting reinforcing bar penetrates the deflection preventing member. 4. A slit forming mold according to 3.   5. The two slit mold plates are divided into a plurality of parts in a vertical direction by a dividing surface oblique to the vertical direction of the inner wall surface of the slit, and the divided surfaces are in contact with each other. The slit forming form described in item 1.   After constructing the concrete wall using the slit forming mold according to any one of claims 1 to 5, the front projecting part and the rear projecting part of the two slit mold plates A slit forming method in which at least one of the gap forming members is removed between the cut parts by cutting at least one of the cut parts, and then the mold is removed to form a slit in the concrete wall.

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