JP2023150622A - Formwork holding tool and foundation construction method - Google Patents

Abstract

To provide a formwork holding tool that can hold the position of a formwork during foundation work and suitably be dismantled after concrete casting.SOLUTION: A formwork holding tool 20 is placed in the gap G between a first formwork unit 10A and a second formwork unit 10B, which are installed at opposite positions with a predetermined interval, the position of each formwork unit 10 is held when foundation concrete is cast into each formwork unit 10. The formwork holding tool 20 includes an elongated member 21 that can be inserted into the gap, and a contact member 22 that protrudes outward from the outer surface of the elongated member and can come into contact with the outer surfaces of the first formwork unit 10A and the second formwork unit 10B. The contact member 22 has a width that allows it to be inserted into the gap and a length that allows it to come into contact with the outer surface of each formwork unit. The formwork holding tool 20 holds the position of each formwork unit 10 by bringing the contact member 22 into contact with each formwork unit 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to a formwork holder and a foundation construction method, and more particularly, to a formwork holder and foundation construction method used when pouring foundation concrete into a foundation formwork unit.

Conventionally, formwork units have been used in building foundation work.
The main flow of foundation work is to assemble a formwork unit according to the shape of the foundation, and pour foundation concrete into the formwork unit (when assembling the formwork unit, anchors that connect the building's foundation and the foundation (Align the bolts and install). After the foundation concrete has had a sufficient curing period, the assembled formwork units are dismantled.
In the above foundation work, when the foundation concrete is placed between the first formwork unit and the second formwork unit, which are installed at opposing positions with a predetermined interval, and the foundation concrete is poured into each formwork unit. A position holder (space holder) for holding the positions of a first formwork unit and a second formwork unit is known (for example, see Patent Document 1).

Japanese Patent Application Publication No. 2007-262670

By the way, if the formwork is assembled in positions facing each other and close to each other (positions with narrow intervals) during foundation construction, the formwork cannot be dismantled after the foundation concrete is poured (the formwork cannot be removed by tilting it outward). ) happened.
Specifically, the formwork was pushed outward by the lateral pressure of the foundation concrete, causing opposing formwork to approach each other, making it impossible to dismantle the formwork.
In response to the above, it is conceivable to fill the gap by, for example, pouring foundation concrete as one piece, but doing so may affect the stress transmission in the structure of the building. Additionally, there was a risk that the internal temperature of the concrete would rise unintentionally due to the concrete being poured in one piece.
For example, it may be possible to bury the formwork, but in this case, the lateral pressure of the concrete would cause the buried formwork to become uneven, and there was a risk that the formwork would fit into the required concrete cross section.
In addition, the position holding device of Patent Document 1 does not hold the positions of the formworks that face each other and approach each other, and is buried in the foundation concrete. Therefore, the position holder could not be used as is.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to maintain the position of assembled formwork during foundation work and to dismantle the formwork suitably after concrete pouring. The object of the present invention is to provide a formwork holder and a foundation construction method that make it possible.
Another object of the present invention is to provide a formwork holder and a formwork holder that enable the formwork to be suitably dismantled after concrete pouring even when the formwork is assembled in positions facing each other and approaching each other. The purpose is to provide a foundation construction method.

The above-mentioned problem can be solved by the formwork holder of the present invention, which is used when pouring foundation concrete in a formwork unit for a foundation, and which is installed at opposing positions with a predetermined interval. The positions of the first formwork unit and the second formwork unit are arranged in the gap between the formwork unit and the second formwork unit, and when the foundation concrete is poured into each formwork unit. The formwork holder includes an elongated member that can be inserted into the gap and extends in a long length, and a formwork holder that is provided on an outer surface of the elongated member and that extends from the outer surface of the elongated member to the elongated member. an abutment member that protrudes outward in the width direction of the length member and can abut on the outer surface of the first formwork unit and/or the outer surface of the second formwork unit, the abutment member has a width that allows it to be inserted into the gap and a length that allows it to come into contact with the outer surface of the first formwork unit and/or the outer surface of the second formwork unit, and the formwork holding The tool holds the position of each formwork unit by bringing the contact member into contact with the outer surface of the first formwork unit and the outer side of the second formwork unit, or holds the position of each formwork unit. The contact member is brought into contact with the outer surface of one of the first formwork unit and the second formwork unit, and the elongated member is brought into contact with the outer surface of the other formwork unit. This is solved by holding the position of each formwork unit by holding the position of each formwork unit.

With the above configuration, it is possible to realize a formwork holder that can suitably dismantle the formwork units after concrete pouring, even when the formwork units are assembled in positions facing each other and approaching each other. can.
Specifically, the formwork holder has a width that allows it to be inserted into the gap between the first formwork unit and the second formwork unit, and the formwork holder has a width that allows it to be inserted into the gap between the first formwork unit and the second formwork unit. It has a length that allows it to come into contact with the side surface and the outer surface of the second formwork unit. Therefore, for example, after inserting the formwork holder into the gap, by changing the position or orientation of the formwork holder, it can be brought into contact with the first formwork unit and the second formwork unit. Then, the forces received from both formwork units can be offset and maintained.
By doing so, during concrete pouring, the positions of the first formwork unit and the second formwork unit are maintained, and after concrete pouring, the positions of the first formwork unit and the second formwork unit can be maintained from the gap between the first formwork unit and the second formwork unit. It becomes possible to take it out. Then, it is possible to prevent these formwork units from shifting laterally after concrete pouring, making it impossible to dismantle the formwork.

At this time, the abutment member has a first protrusion and a second protrusion that protrude from the outer surface of the elongated member toward opposite sides, and the first protrusion is connected to the first formwork unit. The second protrusion is capable of contacting an outer surface of the second formwork unit, and the formwork holder is arranged in a longitudinal direction of the elongated member. By rotating the elongated member with the axis direction as It is preferable to switch between the abutment positions where the contact position can be adjusted.
With the above configuration, by simply switching the contact member between the "insertion position" and the "contact position", the contact member can be inserted into the gap between the formwork units, and then brought into contact with each formwork unit. The position of the formwork units can be maintained, and it can also be removed from the gap between the formwork units.

At this time, it is preferable that the corners of the protruding tips of the first protruding part and the second protruding part are chamfered.
With the above configuration, when rotating the form holder around the axis to switch between the "insertion position" and the "contact position", the operator can smoothly perform the switching operation.
Specifically, since the corners of the protruding tip are chamfered, it is possible to prevent the corners from getting caught in the formwork during the switching rotation operation.

At this time, the elongated member is an elongated bolt extending in an elongated manner, and the abutment member has a through hole for passing the elongated bolt, and the elongated member is provided in the through hole. The contact member is attached to the long bolt by passing the bolt through the bolt, and the contact member is screwed onto the shaft portion of the long bolt, and the height position can be adjusted by adjusting the screwing position with respect to the long bolt. Alternatively, the height position can be changed by adjusting the screwing position of the long bolt and the nut, and is held by a nut screwed onto the shaft portion of the long bolt. It would be good if it was configured so that it could be changed.
With the above configuration, the vertical position of the abutment member can be changed as appropriate depending on the size and shape of the formwork unit. By doing so, the formwork holder can more suitably hold the position of the formwork unit.

At this time, the formwork holder is attached to the outer surface of one end of the elongated member in the longitudinal direction, and is formed so as to protrude from the outer surface of the elongated member toward mutually opposite sides. It is good to further include a clamping member for sandwiching each of the first formwork unit and the second formwork unit from above.
With the above configuration, the positions of the first formwork unit and the second formwork unit can be held more suitably.
Further, by providing the clamping member as described above, the formwork holder can be positioned at the "contact position". That is, it is possible to prevent the formwork holder from being unintentionally switched between the "contact position" and the "insertion position".

According to the foundation construction method of the present invention, the problem is a foundation construction method using the formwork holder, in which the first formwork unit and the first formwork unit are placed at opposing positions with a predetermined interval. a formwork erection step of assembling the second formwork unit; and a holding step of inserting the formwork holder into the gap between the assembled first formwork unit and the second formwork unit from above or from the side. a tool insertion step, a holder rotation step of rotating the formwork holder inserted into the gap with the longitudinal direction of the elongated member as the axial direction, and an outer surface of the first formwork unit and the a formwork holding step of holding the position of each formwork unit by bringing the formwork holder into contact with the outer surface of the second formwork unit; and holding the formwork in contact with each formwork unit. a second holder rotation step of rotating the tool; a holder removal step of removing the rotated formwork holder from the gap; and dismantling the first formwork unit and the second formwork unit. The invention is also solved by including a formwork dismantling step.

At this time, after the form erecting step and before the holder rotation step, a second form holder is attached so as to sandwich the first form and the second form forming the form unit. It further includes a second holder attachment step, and in the second holder attachment step, the first holder and the second holder provided at both ends of the second form holder in the extending direction It is preferable that the second formwork holder is attached so as to sandwich the first formwork and the second formwork from above, respectively.
By further including the second holder attachment step as described above, it becomes possible to suitably hold each of the first form unit and the second form unit during pouring of foundation concrete.

According to the formwork holder and foundation construction method of the present invention, it is possible to maintain the position of the formwork unit assembled during foundation work and to suitably dismantle the formwork unit after concrete pouring.
In particular, even if the formwork units are assembled in positions facing each other and close to each other, the formwork units can be suitably dismantled after concrete pouring.

It is a perspective view of a formwork unit and a formwork holder, and is a figure showing the state before inserting a formwork holder into the gap between formwork units. It is a perspective view of a formwork unit and a formwork holder, and is a figure showing a state where a formwork holder is inserted into a gap and made to contact a formwork unit. It is a side view (outside view) of a formwork unit, and is a figure showing a formwork and a connection member. It is a perspective view of a formwork holder. It is a front view (front sectional view) of a formwork unit and a formwork holder, and is a figure showing a state before inserting a formwork holder into a crevice. It is a figure which shows the state where the formwork holder inserted into the gap is in an "insertion position." It is a figure which shows the state in which a formwork holder is in a "contact position." FIG. 3 is a diagram showing a state in which foundation concrete has been placed inside the formwork unit. It is a figure which shows the state which removed the formwork holder from the gap. It is a figure which shows the state which disassembled the formwork unit.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5F.
This embodiment is used when pouring foundation concrete into a formwork unit for a foundation, and is used to create a gap between a first formwork unit and a second formwork unit that are installed at opposing positions with a predetermined interval. Placed in the gap, it maintains the position of the first formwork unit and the second formwork unit when the foundation concrete is poured into each formwork unit, and can be removed from the gap after the foundation concrete is poured. This invention relates to a "form holder" whose main feature is that
The invention also relates to a "foundation construction method using a formwork holder."

<Foundation construction jig>
The foundation construction jig 1 of this embodiment is a jig used when constructing the foundation of a building made of reinforced concrete, as shown in FIGS. 1 to 4.
Specifically, the foundation construction jig 1 is used when pouring foundation concrete, and includes formwork units 10 (10A, 10B) assembled according to the shape of the foundation, a first formwork unit 10A, and A formwork holder 20 is arranged in the gap G between the second formwork units 10B and holds the positions of the first formwork unit 10A and the second formwork unit, and the first formwork unit 10A and the second formwork It is mainly composed of a plurality of second formwork holders 30 that sandwich each unit 10B from above.

As shown in FIGS. 1 to 3, the formwork unit 10 is provided so as to face both sides of the foundation (foundation space) in the width direction, and includes a plurality of molds assembled along the extension direction of the foundation. It includes frames 11 (11A, 11B) and, as shown in FIG. 3, a connecting member 12 that removably connects adjacent formworks 11 to each other.
Note that an anchor ruler may be attached to the upper surface of the assembled formwork 11 in order to position the anchor bolts that connect the foundation of the building and the foundation.

As shown in FIG. 3, the formwork 11 is a steel formwork that is elongated in the vertical direction, and includes a vertical wall portion 11a that extends in the vertical direction and comes into contact with poured concrete during foundation work; A top wall part 11b and a bottom wall part 11c protrude from the top and bottom ends of the vertical wall part 11a to the outside (back side) of the formwork 11, respectively, and a formwork protrudes from both widthwise ends of the vertical wall part 11a, respectively. 11, and left and right side wall portions 11d projecting to the outside.

As shown in FIG. 3, the connecting members 12 are connecting fittings (connecting pins) that connect adjacent formworks 11 to each other, and a plurality of connecting members 12 are attached at predetermined intervals in the vertical direction.
Specifically, the connecting member 12 includes a shaft portion 12a for insertion into the insertion hole formed in the side wall portion 11d of the adjacent formwork 11, and a shaft portion 12a that protrudes outward from the surface of the shaft portion 12a and connects the adjacent moldwork. 11, and hook-shaped clip portions 12b for sandwiching the respective side wall portions 11d.
The connecting member 12 is configured so that the clip portion 12b can be rotated about the shaft portion 12a as a central axis. Therefore, the connecting member 12 can be switched between a connected state in which the formworks 11 are connected to each other and a released state in which the formworks 11 are disconnected from each other by rotating the clip portion 12b.

<Formwork holder>
As shown in FIGS. 1 to 4, the formwork holder 20 is arranged in a gap G between the first formwork unit 10A and the second formwork unit 10B, which are installed at opposing positions with a predetermined interval. This is a jig that holds the position of the formwork units 10A, 10B when foundation concrete is poured into the formwork units 10A, 10B.
The formwork holder 20 also has an "insertion position" where it can be inserted into the gap G, as shown in FIG. 1, and an "insertion position" where it cannot be inserted into the gap G, as shown in FIG. It is possible to switch between a "contact position" in which the formwork units 10A, 10B can be held by being brought into contact with the formwork units 10A, 10B.

The formwork holder 20 maintains the positions of the formwork units 10A and 10B even if the first formwork unit 10A and the second formwork unit 10B that face each other are in a position where they approach each other (a position where the gap G is narrow). It is also a jig that makes it possible to suitably dismantle the formwork units 10A and 10B after pouring the foundation concrete.
For example, even if the gap G is about 20 to 30 mm, the formwork holder 20 can be used to assemble the formwork units 10A, 10B, pour the foundation concrete, and dismantle the formwork units 10A, 10B. Able to perform work.

As shown in FIGS. 1, 2, and 4, the formwork holder 20 includes an elongated member 21 that can be inserted into the gap G, and that is provided on the outer surface of the elongated member 21. , a contact member 22 that protrudes outward in the width direction of the elongated member 21 from the outer surface of the elongated member 21 and can abut on the outer surface of the first form unit 10A and the outer surface of the second form unit 10B; 2 abutting members 24.
Moreover, the formwork holder 20 is attached to the outer surface of the upper end side of the elongated member 21, and is formed so as to protrude from the outer surface of the elongated member 21 toward mutually opposite sides, and includes the first formwork unit 10A and It further includes a clamping member 25 that clamps the second formwork unit 10B from above.

The elongated member 21 is a long bolt that is elongated, and can be inserted into the gap G between the first formwork unit 10A and the second formwork unit 10B from above or from the side.
As shown in FIG. 2, the elongated member 21 is arranged so as to protrude above the first form unit 10A and the second form unit 10B when inserted into the gap G.

The contact members 22 are substantially elliptical plate members, and a plurality of contact members 22 are arranged at predetermined intervals in the longitudinal direction of the elongated member 21 . In this embodiment, two are arranged at the center of the elongated member 21.
The contact member 22 has a width that allows it to be inserted into the gap G, and a length that allows it to come into contact with the outer surface of the first mold unit 10A and the outer surface of the second mold unit 10B.
The abutting member 22 is formed at the center of its main body portion, and has a through hole 22a for passing the elongated member 21 through. installed.

The contact member 22 has a first protrusion 22b and a second protrusion 22c that continuously protrude from the main body toward opposite sides.
The first protrusion 22b and the second protrusion 22c protrude from the outer peripheral surface of the elongated member 21 toward opposite sides.
The first protrusion 22b can come into contact with the outer surface of the vertical wall 11a of the first formwork unit 10A, and the second protrusion 22c can come into contact with the outer surface of the vertical wall 11a of the second formwork unit 10B. It is possible to come into contact with.

The contact member 22 is held by height adjustment nuts 23 (23a, 23b) that are screwed onto the shaft portion of the elongated member 21, and adjusts the screwing position of the elongated member 21 and the height adjustment nut 23. It is configured so that the height position can be changed by doing so.
By doing so, the vertical position of the contact member 22 can be changed as appropriate depending on the size and shape of the formwork unit 10 (formwork 11).

The second contact members 24 are nut members, and a plurality of second contact members 24 are arranged on the elongated member 21 at predetermined intervals. In this embodiment, they are arranged at the upper end portion and the lower end portion of the elongated member 21, respectively.
The second contact member 24 is, for example, an oval nut member, and has a width that allows it to be inserted into the gap G, and is capable of contacting the outer surface of the first form unit 10A and the outer surface of the second form unit 10B. It has a length of .
The second contact member 24 can come into contact with the outer surface of the upper wall portion 11b of the first formwork unit 10A, and can also come into contact with the outer surface of the upper wall portion 11b of the second formwork unit 10B. It has become.
The second contact member 24 is screwed onto the shaft portion of the elongated member 21, and its height position can be changed by adjusting the screwed position with respect to the elongated member 21.

In the above configuration, the abutting member 22 and the second abutting member 24 can be inserted into the gap G by rotating the elongated member 21 with the longitudinal direction of the elongated member 21 as the axial direction. It switches between the "insertion position" shown in , and the "contact position" which cannot be inserted into the gap G and can be brought into contact with the respective formwork units 10A and 10B.
By doing so, it is possible to hold the position of the formwork units 10A, 10B by making them come into contact with the formwork units 10A, 10B after inserting them into the gap G between the formwork units 10A, 10B with a simple operation. can. It can also be easily removed from the gap G.

Further, in the above configuration, as shown in FIG. 4, the corners of the protruding tips of the first protruding part 22b and the second protruding part 22c are rounded and chamfered.
By doing so, when rotating the formwork holder 20 around the axis to switch between the "insertion position" and the "contact position", the operator can smoothly perform the switching operation.
To be more specific, it is possible to prevent the corner from getting caught in the formwork 11 during the switching rotation operation.
Although it is preferable that the corners of the protrusions 22b and 22c be curved, they do not necessarily have to be rounded. For example, the tips of the corners may be cut obliquely.

As shown in FIGS. 2 and 4, the holding member 25 is a member that holds the first formwork unit 10A (formwork 11) and the second formwork unit 10B (formwork 11) from above. It is arranged at the upper end portion of the member 21.
Specifically, the holding member 25 includes a main body portion 25a that extends in a direction perpendicular to the extending direction of the elongated member 21 and comes into contact with the upper surface of each formwork 11, and both ends of the main body portion 25a in the extending direction. It has left and right protrusions 25b and 25c that are provided in the section, protrude toward the abutting member 22 side, and abut on the inner surface of the respective formwork 11.

The holding member 25 is formed at the center of the main body 25a, has a through hole 25d for passing the elongated member 21 through, and is attached to the elongated member 21 by passing the elongated member 21 through the through hole 25d. It is being
Further, the holding member 25 is attached to the elongated member 21 while being in contact with the upper surface of the second abutting member 24 , and is being fixed in a state where it is sandwiched between the second abutting member 24 and the fixing nut 26 .

By providing the clamping member 25 as described above, the positions of the first formwork unit 10A and the second formwork unit 10B can be held more suitably.
Moreover, by providing the clamping member 25, the formwork holder 20 can be positioned at the "contact position" shown in FIG. That is, it is possible to prevent the formwork holder 20 from being unintentionally switched between the "contact position" and the "insertion position".

<Second formwork holder>
As shown in FIGS. 1 and 2, the second formwork holder 30 is a jig ( width fixing jig).
Specifically, the second formwork holder 30 extends to connect the first formwork 11A and the second formwork 11B that constitute the formwork unit 10, and has a main body part 31 that abuts the upper surface of each. , a first holding part 32 and a second holding part 33 are provided at both ends of the main body part 31 in the extending direction and protrude toward the formwork unit 10 side.

The first holding portion 32 includes an outer protrusion 32a that protrudes from one end of the main body 31 toward the first mold 11A and abuts the outer surface of the first mold 11A, and an outer protrusion 32a at one end of the main body 31. It has an inner protrusion part 32b which protrudes from a position slightly inside than 32a and comes into contact with the inner surface of the first formwork 11A.
Note that the inner protrusion portion 32b is formed by cutting out (cutting up) a part of the main body portion 31.
The second holding part 33 has the same configuration as the first holding part 32, and includes an outer protrusion 33a and an inner protrusion 33b.

By providing the second formwork holder 30 as described above, it is possible to suitably hold each of the first formwork unit 10A and the second formwork unit 10B during pouring of foundation concrete.

<Foundation construction method using formwork holders>
Next, a foundation construction method using the formwork holder 20 will be explained based on FIGS. 5A to 5F.
The foundation construction method includes a "form erecting process," a "holding tool insertion process," a "holding tool rotation process," a "form holding process," a "concrete pouring process," and a "second The process includes at least a holder rotation process, a holder removal process, and a formwork dismantling process. This will be explained in detail below.
Note that in constructing the foundation of a building, explanations of construction steps other than those described above will be omitted.

First, in the "form erecting step", as shown in FIG. 5A, an operator assembles the first mold unit 10A and the second mold unit 10B at positions facing each other with a predetermined interval.
Specifically, as shown in FIGS. 1 and 3, an operator arranges the first formwork unit 10A so that a plurality of formworks 11A and 11B are lined up facing each other along the extension direction of the foundation. Then, the formworks 11 adjacent to each other in the extending direction are connected by a connecting member 12.
The second formwork unit 10B is arranged in the same manner, but in the second formwork unit 10B, adjacent formworks 11 are not connected to each other by the connecting member 12. In other words, the second form unit 10B does not have the connecting member 12.
Note that a gap G is formed between the first mold unit 10A and the second mold unit 10B.

Then, in the "holder insertion step", as shown in FIG. 5B, the worker inserts the formwork holder 20 upward into the gap G between the assembled first formwork unit 10A and second formwork unit 10B. To insert (insert) from.
Specifically, as shown in FIGS. 1 and 5B, an operator inserts the formwork holder 20 into the gap G with the formwork holder 20 placed in the "insertion position".
At this time, the formwork holder 20 and the formwork units 10A, 10B are in a positional relationship in which they do not come into contact with each other.

Then, in the "holder rotation step", as shown in FIG. 5C, the operator rotates the formwork holder 20 inserted into the gap G with the longitudinal direction of the elongated member 21 as the axial direction.
Specifically, the operator grasps the upper end of the elongated member 21 and rotates the elongated member 21 by 90 degrees around the axis.
By doing so, the formwork holder 20 can be switched from the "insertion position" to the "contact position" shown in FIGS. 2 and 5C.
Note that the operator preferably grips the upper end of the elongated member 21 using a tool such as a spanner or a wrench. Further, in order to make it easier for the operator to grasp the elongated member 21 using the tool, it is preferable that a double nut (two nuts) be attached to the upper end of the elongated member 21.

In the "formwork holding step", as shown in FIG. 5C, the worker brings the formwork holder 20 into contact with the outer surface of the first formwork unit 10A and the outer surface of the second formwork unit 10B. to hold the positions of the respective formwork units 10A and 10B.
To be more specific, the formwork holder 20 switches from the "insertion position" to the "contact position", and the abutment member 22 and the second abutment member 24 abut against the outer surfaces of the formwork units 10A and 10B, The positions of these formwork units 10A and 10B are held.
Moreover, in the above-mentioned "formwork holding step", after the worker switches the formwork holder 20 to the "contact position", the operator attaches the clamping member 25 and the fixing nut 26 to the upper end of the elongated member 21, Position the formwork holder 20.
Specifically, when attaching the clamping member 25 to the upper end of the elongated member 21, the clamping member 25 holds the first formwork unit 10A (formwork 11) and the second formwork unit 10B (formwork 11) from above. Arrange them so that they are sandwiched.
By doing so, the formwork holder 20 can be positioned at the "contact position". In other words, it is possible to prevent the formwork holder 20 from rotating unintentionally.

Then, in the "concrete pouring process", as shown in FIG. 5D, the worker places foundation concrete in the first formwork unit 10A and the second formwork unit 10B.
At this time, the formwork holder 20 is located between the first formwork unit 10A and the second formwork unit 10, and holds these formwork units 10A, 10B so as to tighten them.
By doing so, the formwork holder 20 can hold the formwork units 10A, 10B with as small a holding force as possible while canceling out the forces received from both the formwork units 10A, 10B. In other words, although the formwork holder 20 is simple and small, it is possible to hold the formwork units 10A and 10B.

Then, in the "second holder rotation step," the worker rotates the formwork holder 20 that is in contact with each of the formwork units 10A and 10B by 90 degrees, so that the formwork holder 20 is Return from the "contact position" to the "insertion position".
Then, in the "holder removal step," the operator removes the rotated formwork holder 20 upward from the gap G, as shown in FIG. 5E.

Finally, in the "formwork dismantling process", as shown in FIG. 5F, the worker dismantles the first formwork unit 10A and the second formwork unit 10B.
Specifically, the worker first disassembles the second formwork unit 10B to which the connecting member 12 is not attached among the formwork units 10A and 10B. To be more specific, the second formwork unit 10B (formwork 11) is tilted slightly to the side using the gap G, and then pulled up and removed. After removing the second formwork unit 10B, the connecting member 12 of the first formwork unit 10A is removed while being rotated. Then, the formwork 11 of the first formwork unit 10A is laid down right sideways, and then pulled up and removed.
Note that if the gap G is relatively large, either formwork unit 10A or 10B may be dismantled first, regardless of the above-mentioned dismantling work. Moreover, both formwork units 10 may have the connection member 12.

With the above foundation construction method, it is possible to maintain the positions of the formwork units 10A, 10B assembled during foundation work, and to suitably dismantle the formwork units 10A, 10B after concrete pouring.
In particular, even if the formwork units 10A, 10B are assembled in positions facing each other and close to each other, the formwork units 10A, 10B can be suitably disassembled.

Note that the foundation construction method may further include a "second holder attachment step" after the "form erecting step" and before the "holder rotation step."
In the above-mentioned "second holder attachment process", as shown in FIG. It is better to attach the tool 30.
More specifically, the worker holds the second formwork holder 30 by holding the first formwork 11A and the second formwork 11B from above with the first holding part 32 and the second holding part 33, respectively. It's good to install it.

<Other embodiments>
In the above embodiment, as shown in FIG. 4, the elongated member 21 is an elongated bolt having a threaded portion, but the elongated member 21 is not particularly limited, and may be a rod-shaped member instead of an elongated bolt.
In that case, it is preferable that the abutting member 22 and the second abutting member 24 be fixed to the elongated member 21 (rod-shaped member) by welding, for example.

In the above embodiment, as shown in FIG. 4, the contact member 22 has a first protrusion 22b and a second protrusion 22c that protrude from the outer surface of the elongated member 21 toward opposite sides. , is not particularly limited, and may include only the first protrusion 22b.
In that case, for example, the formwork holder 20 brings the contact member 22 (first protrusion 22b) into contact with the outer surface of the first formwork unit 10A, and contacts the outer surface of the second formwork unit 10B. It is preferable to hold the position of each formwork unit by bringing the elongated member 21 into contact with it.

In the above embodiment, as shown in FIGS. 1 and 2, the formwork holder 20 rotates the elongated member 21 to switch between the "insertion position" and the "contact position", but there are no particular limitations. It's not a thing.
For example, an operator inserts a long bar into the hollow elongated member 21 and uses the bar to push the contact member 22 from a retracted position to an outwardly protruding position. It's okay.

In the above embodiment, as shown in FIGS. 1 and 2, the contact member 22 is held by a height adjustment nut 23 that is screwed onto the shaft portion of the elongated member 21 (elongated bolt). Although the height position can be changed by adjusting the screwing position of the length member 21 and the height adjustment nut 23, this is not particularly limited.
For example, the contact member 22 may have an internal threaded hole for screwing into the elongated member 21, and the height position can be changed by adjusting the screwing position with respect to the elongated member 21. good.

In the above embodiment, the formwork holder and the foundation construction method using the formwork holder according to the present invention have been mainly described.
However, the embodiments described above are merely examples for facilitating understanding of the present invention, and do not limit the present invention. The present invention may be modified and improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof.

1 Foundation construction jig 10 Formwork units 10A, 10B First formwork unit, second formwork unit 11 Formwork 11A, 11B First formwork, second formwork 11a Vertical wall portion 11b Top wall portion 11c Bottom wall portion 11d Side wall portion 12 Connecting member (connecting metal fitting)
12a Base shaft portion 12b Clip portion 20 Formwork holder 21 Long member (long bolt)
22 Contact member 22a Through hole 22b First protrusion 22c Second protrusion 23 (23a, 23b) Height adjustment nut (nut)
24 Second contact member (contact member)
25 Holding member 25a Main body part 25b, 25c Projection part 25d Through hole 26 Fixing nut 30 Second form holder 31 Main body part 32 First holding part 32a Outside projection part 32b Inside projection part 33 Second holding part 33a Outside projection part 33b Inner protrusion F Foundation (foundation concrete)
G gap

Claims (7)

Used when pouring foundation concrete into foundation formwork units.
disposed in a gap between a first formwork unit and a second formwork unit that are installed at opposing positions with a predetermined interval,
A formwork holder that holds the positions of the first formwork unit and the second formwork unit when foundation concrete is poured into each formwork unit,
an elongated member that can be inserted into the gap and that is elongated;
provided on the outer surface of the elongated member, protrudes outward from the outer surface of the elongated member in the width direction of the elongated member, and is provided on the outer surface of the first formwork unit and/or of the second formwork unit. a contact member capable of contacting the outer surface;
The contact member has a width that allows it to be inserted into the gap, and a length that allows it to come into contact with the outer surface of the first formwork unit and/or the outer surface of the second formwork unit,
The formwork holder is
The position of each formwork unit is held by bringing the contact member into contact with the outer surface of the first formwork unit and the outer side of the second formwork unit, or,
The contact member is brought into contact with the outer surface of one of the first formwork unit and the second formwork unit, and the elongated member is brought into contact with the outer surface of the other formwork unit. A formwork holder characterized by holding the position of each formwork unit by bringing them into contact with each other. The abutting member has a first protrusion and a second protrusion that protrude from the outer surface of the elongated member toward opposite sides,
The first protrusion is capable of contacting an outer surface of the first formwork unit, and the second protrusion is capable of contacting an outer surface of the second formwork unit,
The formwork holder is
By rotating the elongated member with the longitudinal direction of the elongated member as the axial direction,
Switching the contact member between an insertion position where the contact member can be inserted into the gap and a contact position where the contact member cannot be inserted into the gap and can be brought into contact with each formwork unit. The formwork holder according to claim 1, characterized in that: 3. The formwork holder according to claim 2, wherein corners of protruding tips of each of the first protruding part and the second protruding part are chamfered. The elongated member is a long bolt extending in a long length,
The contact member has a through hole for passing the long bolt therethrough, and is attached to the long bolt by passing the long bolt through the through hole,
The abutting member is
The bolt is screwed onto the shaft portion of the long bolt, and the height position can be changed by adjusting the screwing position with respect to the long bolt, or
It is held by a nut that is screwed onto the shaft portion of the long bolt, and is configured such that the height position can be changed by adjusting the screwing position of the long bolt and the nut. The formwork holder according to any one of claims 1 to 3, characterized in that: The formwork holder is attached to an outer surface of one end of the elongated member in the longitudinal direction, and is formed to protrude from the outer surface of the elongated member toward opposite sides, and is attached to the first mold. The formwork holder according to claim 4, further comprising a holding member for holding each of the frame unit and the second formwork unit from above. A foundation construction method using the formwork holder according to any one of claims 1 to 5,
a formwork erection step of assembling the first formwork unit and the second formwork unit at opposing positions with a predetermined interval;
a holder insertion step of inserting the formwork holder into a gap between the assembled first formwork unit and the second formwork unit from above or from the side;
a holder rotation step of rotating the formwork holder inserted into the gap with the longitudinal direction of the elongated member as the axial direction;
a formwork holding step of holding the position of each formwork unit by bringing the formwork holder into contact with the outer surface of the first formwork unit and the outer side of the second formwork unit;
a second holder rotation step of rotating the formwork holder brought into contact with each formwork unit;
a holder removal step of removing the rotated formwork holder from the gap;
A foundation construction method comprising: a formwork dismantling step of dismantling the first formwork unit and the second formwork unit. After the form erecting process and before the holder rotation process, a second holder is attached to attach a second form holder so as to sandwich each of the first form and the second form forming the form unit. It further includes a tool installation process,
In the second holder attachment step, the first formwork and the second formwork are attached by a first holding part and a second holding part respectively provided at both ends of the second formwork holder in the extending direction. 7. The foundation construction method according to claim 6, wherein the second formwork holders are attached so as to sandwich them from above.