JP7373639B2 - cloth formwork - Google Patents

Description

The invention disclosed herein relates to a fabric form that is used by filling the inside with a filler.

Cloth formwork is made by forming fiber material into a bag and injecting filler such as concrete or mortar into the bag.It is manufactured with the focus on construction on slopes, and has the flexibility to follow the undulations of the construction surface. It is characterized by having In such a fabric form, a binding string as disclosed in Patent Document 1 is used to determine the thickness by pulling the two fiber materials that expand when the filler is injected so that they do not separate beyond a certain level. In addition, as disclosed in Patent Document 2, there are some that are equipped with reinforcing cables inside in order to increase the bending strength in a predetermined direction.

With these fabric forms, the binding strings stretch by more than 10% due to the expansion pressure of the filler material, making it difficult to maintain stability in shape and dimensions. not present. Originally, it was not intended to be used in an upright position, so even if you try to use it to reinforce concrete walls or ceilings, the shape will not be stable and it will not be easily fixed to the reinforcement construction surface. I can't.

Patent Document 3 discloses a reinforcement method in which a sheet-like lightweight formwork using a reinforced fiber sheet is fixed around a concrete structure with anchors, and mortar is filled between the concrete structure and the lightweight formwork to integrate it. Or a repair method is disclosed. In the case of this method, construction cannot be carried out unless the lightweight formwork is fixed and its edges are sealed with a separate sealant to prevent mortar leakage. If cloth formwork could be applied to such reinforcement or repair, construction would be easier.

JP2011-106096 JP 11-336084 JP 11-256839

In view of the above background, the present invention proposes a cloth formwork that is easy to fix to a construction surface and can be easily used for reinforcing concrete structures.

The cloth formwork according to the present invention is a cloth formwork that is used by injecting a filler into a bag-like frame formed from a fiber material, and a non-flexible pipe material is arranged inside the bag-like frame. A fiber material is fixed to the end of the tube material, and a hole communicating with the inner space of the tube material is formed in the fiber material.

In this cloth formwork, reinforcing materials can be placed inside the bag-like frame. The reinforcing members can be arranged so as to extend in two directions that intersect with each other. Preferably, the reinforcing material is made of plate-shaped fiber-reinforced plastic and has flexibility.

The fabric form according to the present invention can be used by passing fixing tools such as bolts through the pipe material, so by fixing the fabric form to the construction surface with the fixing device penetrated through the pipe interior space, the structure Can be attached to things.

In the cloth formwork according to the present invention, the non-flexible pipe material functions as a frame spacing member (so to speak, a column) that stabilizes the shape and dimensions (particularly the thickness), and a fixing means for fixing the cloth formwork. Therefore, it is easy to fix to a construction surface, and it can also be easily attached to a structure such as a concrete structure and used for reinforcement.

The top view (A) and side view (B) of the cloth formwork concerning a 1st embodiment. FIG. 1 is a sectional view of main parts of the cloth form according to the first embodiment. FIG. 3 is a plan view of a cloth formwork according to a second embodiment. The figure which shows the example of attachment of the cloth formwork based on 2nd Embodiment in cross section. The figure which shows the example of attachment to the wall surface of the cloth form based on 1st or 2nd embodiment.

A first embodiment of the fabric form according to the present invention is shown in FIG. 1 in a plan view (A) and a side view (B). The cloth form according to this embodiment consists of a bag-like frame 1 formed from two sheet-like fiber materials 1a and 1b. The fiber materials 1a and 1b of the reinforcing fiber fabric are joined to each other at the left and right edges in FIG. 1A by adhesive bonding, sewing, or both. In FIG. 1A, an imaginary boundary line is shown with a dotted line to distinguish this joint. The edges in the vertical direction in FIG. 1A are also joined by adhesive or sewing, but these are formed in a so-called gusseted form to increase thickness. There are many other ways to make the fiber material into a bag shape, so we will not discuss them in detail here.

Since a filler such as concrete or mortar is injected into the bag-like frame 1, an inlet 2 for injecting the filler is provided at the left edge in FIG. 1A. The injection port 2 is formed by sandwiching a plastic or metal pipe between the fiber materials 1a and 1b and sealing the periphery with an adhesive.

Inside the bag-like frame 1, a large number of tube members 10 are arranged at predetermined intervals, preferably at equal intervals. The pipe material 10 is a non-flexible hollow pipe made of plastic or metal (preferably made of lightweight plastic), and by fixing the fiber materials 1a and 1b to the ends of the pipe material 10, the pipe material 10 becomes a fiber material. It functions as a spacing material between 1a and 1b. The non-flexible tube material 10 functions to maintain the spacing (maintain a predetermined thickness) in both the expansion and contraction directions of the bag-like frame 1. The fiber materials 1a and 1b supported by the tube material 10 have holes that communicate with the inner space of the arranged tube material 10, so that a fixing tool such as a bolt can be passed through the tube material 10.

FIG. 2 shows a cross-sectional view of a portion of one tube 10. As shown in FIG. The end portion (in the illustrated case, the end face) of the tube material 10 is brought into contact with a packing material 11 that is adhered with an adhesive around the holes in the fiber materials 1a and 1b, and is adhered with an adhesive. For example, by passing a bolt B with a washer through the pipe material 10 and tightening it with a nut N with a washer from the opposite side, a crimped and sealed structure of the fiber materials 1a, 1b, the packing material 11, and the pipe material 10 is completed, which provides sufficient sealing against the filler material. Demonstrates stopping power. The same effect can be achieved even if the nut N is a plug anchor installed on a structure such as a concrete wall. In other words, the bolt B passed through the tube material 10 or the anchor bolt can be used as a fixture for fixing the bag-like frame 1 to a structure.

In the cloth formwork, reinforcing materials can also be provided inside the bag-like frame 1. This second embodiment is shown in FIG. The reinforcing member of this embodiment includes a vertical reinforcing member 20 and a horizontal reinforcing member 21 extending in two directions (vertical and horizontal in the illustrated case) that intersect with each other. The reinforcing members 20 and 21 are bonded to the inner surfaces of the fiber materials 1a and 1b using an adhesive. At the intersection between the two, the horizontal reinforcing member 21 extends over the vertical reinforcing member 20 (or vice versa). The reinforcing members 20 and 21 are made of thin plate-like fiber-reinforced plastic and have flexibility. This flexibility allows the bag-like frame 1 to be folded and carried. It also becomes possible to use it by bending it according to the undulations of the construction surface. For example, in the case of rod-shaped reinforcing cables as disclosed in Patent Document 2 mentioned above, they cannot be bent, so when considering folded portability, reinforcement cannot be arranged in two directions, vertically and horizontally. Therefore, in the case of Patent Document 2, reinforcement is limited to one direction, either vertically or horizontally, but if this is done, a problem arises in that uniform strength in the vertical and horizontal directions of the fabric form cannot be maintained. In the case of the second embodiment shown in FIG. 3, by forming the reinforcing members 20 and 21 from flexible plate-shaped fiber-reinforced plastic, it is possible to satisfy both vertical and horizontal reinforcement and portability when folded. Become something to do. Also, by making it into a plate shape, there is an advantage that the concrete adhesion area becomes wider and the concrete sticks better.

FIG. 4 shows an example of attaching a fabric form according to the second embodiment. In this example, a fabric form is fixed to the side of a concrete structure C and is erected. The bag-like frame 1 before the filler is injected is made by passing the tube material 10 through the bag-like frame 1 and screwing the bolt B (or anchor bolt) as a fixing device into the plug anchor (grip anchor) P driven into the concrete structure C. Attached to the side of the structure. Each pipe 10 is manufactured with a length determined according to the thickness required for the concrete body formed by the cloth form. The unfixed pipe material 10 in the portion of the bag-like frame 1 that protrudes above the concrete structure C is tightened with bolts B and nuts N as shown in FIG. At this time, the presence of the reinforcing members 20 and 21 maintains the upright state of the bag-like frame 1. After applying the bolts B to all the pipe materials 10, concrete as a filler is injected through the injection port 2 using a pump or the like. Since a large number of non-flexible tubes 10 are arranged at predetermined intervals, they function as a frame interval maintaining material that restricts the expansion of the interval between the fibrous materials 1a and 1b, that is, the expansion of the bag-like frame 1 in the thickness direction. The shape and dimensions of the bag-like frame 1 are stabilized from concrete pouring to subsequent curing. After construction, the cloth formwork is left as it is, forming a concrete body together with the poured concrete.

FIG. 5 shows another example of attachment. This attachment example is a reinforcement structure of a concrete structure C' using the cloth formwork according to the first or second embodiment, and the concrete structure C' consists of one column and two walls. It is assumed that The bag-like frame 1 produced as described above is fixed to the concrete structure C' using the entire pipe material 10 with bolts B and plug anchors. In the case of the bag-like frame 1 according to the second embodiment, the reinforcing members 20 and 21 are provided, but since the reinforcing members 20 and 21 have flexibility as described above, the construction surface of the concrete structure C' It can be fixed exactly along the undulations. In this way, the cloth formwork according to the first and second embodiments can be easily constructed using a simple fixture called the bolt B. After fixing the bag-shaped frame 1, concrete is injected through the injection port 2 and cured, thereby completing a reinforced structure using the cloth formwork. Also at this time, as described above, the non-flexible tube material 10 functions to stabilize the shape and dimensions of the fabric form.

1 Bag-shaped frames 1a, 1b Fibrous material 2 Inlet 10 Pipe material 11 Packing 20, 21 Reinforcement material

Claims (4)

A cloth formwork that is used by injecting a filler into a bag-like frame formed from a fiber material,
A non-flexible tube is disposed inside the bag-like frame, the fibrous material is fixed to the end of the tube, and a hole communicating with the inner space of the tube is formed in the fibrous material ,
A cloth formwork in which reinforcing material is bonded to the inner surface of the bag-like frame . The cloth formwork according to claim 1 , wherein the reinforcing members are arranged so as to extend in two directions that intersect with each other. The cloth formwork according to claim 1 or 2 , wherein the reinforcing material is formed from a plate-shaped fiber-reinforced plastic. An attached structure in which the fabric form according to any one of claims 1 to 3 is attached to a structure,
An attached structure in which the cloth formwork is fixed to the construction surface using a fixture penetrating through the pipe interior space.

Images