JP2011208413A - Unit form and form installation method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple unitized structure allowing efficient assembly without requiring any complicated work.SOLUTION: A unit form includes: a form body 3; an outer frame 4 supporting the form body 3 at an interval from the outer circumference side; and a pantograph jack 5 which is arranged between the form body 3 and the outer frame 4 with its telescopic motion direction directed in the direction separating the form body 3 from or bringing the form body 3 close to the outer frame 4. In the pantograph jack 5, a fixed end at one end in the telescopic motion direction X is fixed to the outer frame 4 in a first joining part T1, while a movable end at the other end is brought into contact in a non-fixed condition with the form body 3 in a second joining part T2.

Description

  The present invention relates to a unit formwork used for placing concrete such as a pillar of a concrete structure and a formwork installation method using the unit formwork.

  In general, construction of columns and walls of concrete structures is performed by assembling reinforcing bars at the site, then installing a formwork and placing concrete. Among these, in assembling the mold, there is a current situation that requires a lot of labor and time because there are operations such as positioning and fixing the mold in a predetermined position, pressing with a diagonal support, and attaching a separator. . And in order to improve construction efficiency with respect to such formwork installation work, what united the formwork is disclosed by patent document 1, for example.

  In Patent Document 1, a first mold body that is integrally mounted with a spacer member through which a support shaft member can be inserted and disposed is opposed to the first mold body via the spacer member, for concrete placement. Is disclosed as a unit structure integrally provided with a second mold body that forms the interval of the above.

JP 2002-146554 A

  However, in the unit mold as shown in Patent Document 1, the assembly efficiency is improved by reducing the labor for attaching the accessory parts such as the spacer member, but it can still withstand the positioning of the mold itself and the weight of the cast concrete. Thus, there has been a problem that the same work as the conventional work occurs in the work of providing the reaction force. Therefore, there is a demand for an excellent unit mold that can efficiently position and fix the mold itself, and there is room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and provides a unit formwork that can be assembled efficiently without a trouble with a simple unitized structure and a formwork installation method using the unit formwork. The purpose is to do.

  In order to achieve the above object, in the unit mold according to the present invention, a mold body, an outer frame that supports the mold body from the outer peripheral side with a space therebetween, and the mold body and the outer frame are interposed. And a pantograph-type jack in which the mold body has an expansion / contraction direction arranged in a direction in which the mold body approaches and separates from the outer frame.

  Moreover, in the formwork installation method using the unit formwork according to the present invention, the formwork installation using the unit formwork provided with the formwork body and the outer frame that supports the formwork body with an interval from the outer peripheral side. The method includes a step of placing a formwork body supported by an outer frame around a placement object to be placed, and a pantograph jack that is interposed between the formwork body and the outer frame. And the step of moving the mold body in a direction approaching and separating from the outer frame and setting it at a predetermined placement position.

In the present invention, with the mold body close to the outer frame side, the unit mold frame is placed at a predetermined placement position while being suspended by a crane or the like, and in this state, the outer frame is fixed by an appropriate fixing means. After that, since the outer frame is fixed by extending the pantograph jack, the mold body can be moved in the direction away from the outer frame and placed in the placement position. Formwork can be set.
In addition, since the mold body is supported by the outer frame only by the pantograph jack, there is an advantage that a conventional frame support member such as an oblique support or a separator is not required.

  Further, in the unit formwork according to the present invention, the pantograph jack has a fixed end at one end in the expansion / contraction direction fixed to the outer frame, and a movable end at the other end fixed or not fixed to the formwork body. It is preferable that it can be selectively configured.

  In the present invention, the movable end of an arbitrary pantograph jack is brought into contact with the mold body in a non-fixed state, so that the press of the pantograph jack is first released at the time of demolding. It is possible to relieve the supporting force given to. For this reason, the mold body can be removed without being pulled away from the placement body by the pulling force of the pantograph jack, so that the deterioration of the concrete surface of the placement body can be prevented.

  According to the unit formwork and the formwork installation method using the unit formwork of the present invention, the reaction force at the time of placing concrete borne by the formwork body can be transmitted to the outer frame via the pantograph jack. And the work for positioning and fixing the mold body can be done with a simple structure such as moving the mold body in the telescopic direction by extending the pantograph jack, and it is unitized, so it does not take time Formwork can be installed efficiently.

It is a perspective view which shows the structure of the unit formwork by embodiment of this invention. It is a top view of the unit mold shown in FIG. 1, Comprising: It is a figure of the state which set the mold main body in the placement position. It is a top view of the unit mold form shown in FIG. 1, Comprising: It is a figure of the state which made the mold frame main body the open position. It is a sectional side view which shows the movement state of a mold main body, Comprising: (a) is a figure which shows an open position, (b) is a figure which shows a placement position.

Hereinafter, a unit mold according to an embodiment of the present invention and a mold installation method using the unit mold will be described with reference to the drawings.
As shown in FIG. 1, a unit mold 1 according to this embodiment is a mold integrally provided on a frame member (outer frame 4 described later) having a reaction force receiving function of the mold, and is made of reinforced concrete. This is used when constructing a concrete placing body (hereinafter simply referred to as “placement body 2”) such as a pillar or wall of a building. Here, the placing body 2 according to the present embodiment has a rectangular cross section.

As shown in FIG. 1 to FIG. 3, specifically, the unit mold 1 includes a mold body 3 (3A, 3B, 3C, 3D) disposed on each of the four side surfaces of the placing body 2, and a mold frame. With the main bodies 3A to 3D arranged in a rectangular shape in a plan view, the outer frame 4 that supports them from the outer peripheral side with a constant interval S, and the mold main body 3 are moved in the direction of approaching and separating from the outer frame 4 A plurality of pantograph-type jacks 5 are provided for general construction.
In FIG. 1, the pantograph-type jack 5 shows only the position relative to the outer frame 4 in a simplified manner.

In other words, the unit formwork 1 is formed by unitizing the formwork body 3 and the outer frame 4 with the pantograph jack 5, and sets the four formwork bodies 3 </ b> A to 3 </ b> D inside the outer frame 4. It has a structure that can do.
For example, the unit mold 1 that has been assembled in advance at a factory or the like can be carried into the site.

  The mold body 3 is preferably a lightweight and easy-to-carry resin member, but the member is not limited and may be a steel member. Here, in the mold body 3, the surface opposite to the placement surface 3 a (outer frame 4 side) is referred to as an “outer surface 3 b”. On the outer surface 3b of the mold main body 3, a long reinforcing member 6 extending in the vertical direction is provided at a position facing a vertical member 42A of the outer frame 4 described later. Here, a square steel pipe is adopted as the reinforcing member 6.

The outer frame 4 is made of a square steel pipe, and as shown in FIG. 1, an outer frame 41 disposed on each side of the box shape surrounding the mold body 3 and a surface surrounded by the outer frame 41. Support frame 42.
The support frame 42 includes a plurality of vertical members 42 </ b> A arranged at predetermined intervals in the horizontal direction, and a horizontal member 42 </ b> B arranged at a substantially intermediate position in the vertical direction of the outer frame 41.

  In the outer frame 4, at the first joint T1 (the upper side and the lower side of the outer unit 4) between the vertical member 42A and the outer frame 41, a pantograph jack 5 (referred to as 5A) is used to form the main body 3 and the outer frame. 4 is connected and supported. In addition, at the second joint T2 between the vertical member 42A and the horizontal member 42B, one end (movable end 5a) of the pantograph jack 5 (referred to as 5B) on the mold body 3 side is a reinforcing member. 6 is contacted in a non-fixed state.

  Here, the space S between the mold body 3 and the outer frame 4 is determined by the pantograph jack 5 so that the mold body 3 is placed at a predetermined placement position P1 (FIG. 2) and the outer frame 4 from the placement position P1. It is set as the dimension which can move to the appropriate position (open position P2) of the side.

As shown in FIG. 4A, the pantograph jack 5 transmits and supports the reaction force of the mold body 3 to the outer frame 4. Specifically, the pantograph-type jack 5 includes a movable link 51 including a rhombus-shaped link mechanism that is disposed in a state where the expansion / contraction direction X is directed in a direction orthogonal to the surface direction of the mold body 3. A fixed support base 52 is provided at one end (fixed end 51a) on the outer frame 4 side in the direction X.
By fixing the fixed support base 52 to the outer frame 4, the movable end 51 a moves in the expansion / contraction direction X due to expansion / contraction of the movable link 51. The movable end 51a is provided with a locking member 53 that is fixed to the reinforcing member 6 by connecting means such as a bolt.

The pantograph jack 5 (5A) provided at the first joint portion T1 shown in FIG. 1 is provided with a screw shaft 54 that is screwed into both the link portions 51c and 51d of the movable link 51, and FIG. ), The movable link 51 is extended by rotating the screw shaft 54 in one direction, and the mold body 3 moves in a direction away from the outer frame 4 (arrow X1 direction). Yes.
On the other hand, as shown in FIG. 4A, the movable link 51 is contracted by rotating the screw shaft 54 in the reverse direction, and the mold body 3 moves in the direction close to the outer frame 4 (arrow X2 direction). become.

  Further, the pantograph jack 5 (5B) provided at the second joint portion T2 shown in FIG. 1 does not fix the movable end 51a to the outer surface 3b (here, the reinforcing member 6) of the mold body 3 at the time of placing. It is in a state of being held in contact with.

Next, the effect | action of the unit mold form mentioned above and the mold installation method using a unit mold form are demonstrated using drawing.
As shown in FIG. 1, when placing the casting body 2 into concrete, the crane is placed in a state where the formwork body 3 is disposed at a position close to the outer frame 4 side (open position P2 shown in FIG. 3). The unit mold 1 is placed at a predetermined position while being hung with, for example. That is, the mold body 3A to 3D supported by the outer frame 4 is arranged so as to surround the outer periphery of the placement body 2 to be placed. At this time, the outer frame 4 is fixed to the bottom plate by appropriate fixing means.

Next, as shown in FIGS. 4 (a) and 4 (b), the screw shaft 54 of the pantograph jack 5A in the first joint T1 shown in FIG. The link 51 extends, and the mold body 3 moves in a direction away from the outer frame 4 (in the direction of the arrow X1) and is disposed at the placement position P1 (see FIG. 3).
Further, the movable link 51 of the pantograph-type jack 5B at the second joint portion T2 shown in FIG. 1 is extended, and the locking member 53 provided at the movable end 51b at the tip is brought into contact with the side surface 6a of the reinforcing member 6.
In this way, the unit mold 1 is set, and the concrete placement preparation is completed.

  Then, when a normal placing process for placing concrete in the set unit mold 1 and curing is performed, the unit mold 1 is removed. That is, the pantograph jack 5B at the second joint T2 is loosened to move the movable end 51a away from the mold body 3 (reinforcing member 6), and the pantograph jack 5A at the first joint T1 is further shrunk to form the mold body. 3 is moved to the outer frame 4 side (in the direction of the arrow X2) and removed from the placement body 2.

  In addition, since the mold body 3 is supported by the outer frame 4 only by the pantograph jack 5, there is an advantage that a conventional frame support member such as an oblique support or a separator is unnecessary.

Furthermore, in the unit mold 1, the movable end 51a of the pantograph jack 5B at the second joint T2 is brought into contact with the mold body 3 in an unfixed state. It is possible to release the presser first and relieve the supporting force applied to the mold body 3 step by step.
For this reason, the mold body 3 can be removed without being pulled away from the placing body 2 by the tensile force of the pantograph-type jack 5, so that the quality deterioration of the concrete surface of the placing body 2 can be prevented.

As described above, in the unit formwork and the formwork installation method using the unit formwork according to the present embodiment, the reaction force at the time of placing concrete borne by the formwork body 2 is transmitted to the outer frame 4 via the pantograph jack 5. be able to.
Then, the work for positioning and fixing the mold body 3 can be performed by a simple structure in which the mold body 3 is moved in the expansion / contraction direction X by extension of the pantograph jack 5 and is unitized. The formwork can be installed efficiently without taking up.

The embodiment of the unit formwork and the formwork installation method using the unit formwork according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and may be appropriately selected without departing from the scope of the present invention. It can be changed.
For example, the members such as the shape, size, and arrangement of the vertical members 42A and 42B of the support frame 42, the number of the members, and the like can be arbitrarily set.
Further, the configuration of the pantograph jack 5 such as capability, size, quantity, and installation position can be appropriately set according to the shape of the mold body 3 and the outer frame 4.

Further, in the present embodiment, the movable end 51a of the pantograph jack 5B is brought into contact with the formwork body 3 (reinforcing member 6) in an unfixed state at the second joint portion T2, but such a form is omitted. The movable end 51a of the pantograph jack 5 may be fixed to the mold body 3 (reinforcing member 6).
Moreover, the shape of each formwork main body 3A-3D can be arbitrarily set according to the shape and magnitude | size of the placement body 2 used as placement object.
In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Unit formwork 2 Placing body 3, 3A-3D Formwork body 4 Outer frame 5, 5A, 5B Pantograph type jack 6 Reinforcing member 51 Movable link 51a Movable end 51b Fixed end T1 First joint T2 Second joint

Claims (3)

A mold body,
An outer frame that supports the mold body from the outer peripheral side with a gap;
A pantograph-type jack that is interposed between the mold body and the outer frame, and in which the expansion and contraction direction is arranged in a direction in which the mold body approaches and moves away from the outer frame;
A unit formwork characterized by comprising:   The pantograph jack is characterized in that a fixed end at one end in an expansion / contraction direction is fixed to the outer frame, and a movable end at the other end can be selectively fixed or non-fixed with respect to the mold body. The unit mold according to claim 1. A formwork installation method using a unit formwork provided with a formwork body and an outer frame that supports the formwork body with an interval from its outer peripheral side,
Placing the mold body supported by the outer frame around the placement body to be placed; and
By extending and contracting a pantograph jack interposed between the formwork body and the outer frame, the formwork body is moved in a direction approaching and separating from the outer frame to a predetermined placement position. Setting process;
A method of installing a form using a unit form.

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