JP4019789B2 - Permanent formwork board connection structure and connection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure and a connection method for a permanent form board, and more particularly to a connection structure and a connection method for a permanent form board that also serves as a dam plate that is left in an embedded state on the surface of cast concrete.
[0002]
[Prior art]
When constructing a concrete structure, after assembling a mold of a predetermined shape at a predetermined position, fresh concrete is placed in the mold and cured until the required strength is obtained. Yes.
[0003]
As the formwork used for such applications, wooden and steel flat formwork plates having a function as a dam plate for preventing leakage of cast concrete are widely used, and a plurality of formwork plates are used. It was assembled by connecting with clips.
[0004]
Such a formwork plate is normally assembled and disassembled repeatedly and used for multiple rotations, so it is relatively low cost. However, it takes time to assemble and dismantle, and the joints and concrete leak out from the joints. There was a drawback that it was easy to do.
[0005]
On the other hand, although it cannot be diverted, a buried precast formwork that is also used as a dam plate that is left in the buried state is also used on the surface of the cast concrete. There were problems described below.
[0006]
[Problems to be solved by the invention]
In other words, the buried precast formwork is produced by pouring concrete in a factory by custom-made production according to construction. However, such a precast formwork has a relatively thick member, so its weight is about several times that of a steel formwork, the workability at the site is poor, and heavy equipment such as a large crane is required for assembly work. The cost was high.
[0007]
Therefore, recently, in order to solve such a problem, a cement board having a thickness of about 10 mm, which is manufactured through a pressing process using cement as a main component and high-strength vinylon fiber as a reinforcing fiber, has been developed.
[0008]
This cement board has a bending strength of 30 MPa or more and high toughness (with a span of 18 cm and a maximum deflection of 25 mm). When used as a permanent form board, the cement board has a size of about 0.5 m to 2.0 m square. Connect the same thing.
[0009]
When connecting such a permanent formwork board, the backing plate provided with the tap hole (screw hole) was interposed in the joining part of the board, and it joined and connected by bolting.
[0010]
In this case, an adhesive span seal was used as a joint material for the water-stopping treatment at the joint, but the edges between the boards were cut off at the joint and were not integrated. I could not.
[0011]
Moreover, when using such a joint material, when connecting the formwork board, the joint material is pressed from the back surface side. In this case, usually, a distance of about 5 to 10 cm behind the board. In addition, because of the presence of reinforcing bars, this pressing work was cumbersome and difficult.
[0012]
The present invention has been made in view of the above-described conventional problems, and the object of the present invention is to provide a permanent mold that enables integral joining between boards and can be easily connected. To provide a frame board coupling structure and a coupling method.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a structure for connecting a plurality of permanent form boards that are arranged adjacent to each other in the front-rear and left-right directions in a connection structure for a permanent form board that also serves as a weir plate that is left on the surface of cast concrete. A strip-shaped joint board that is extended along the entire length of the back surface side so as to straddle between the adjacent permanent formwork boards along the joint portion, and is installed with an adhesive interposed therebetween, and A backing plate having a through tap hole in which a screw is provided in correspondence with a mounting hole formed in the permanent mold board and attached to the back side of the joint board; and the permanent mold With the joint board and the backing plate installed on the back side of the board, the permanent mold board is screwed into the through tap hole from the surface side of the permanent mold board via the mounting hole. ,Joint Over bets and part backing plate through the projecting from the tap hole, and a anchor bolts embedded in the punching set concrete, the joint board, the permanent formwork board predetermined width and Cut to length and used.
[0014]
According to the connection structure of the permanent formwork board configured in this way, along the joint part of a plurality of permanent formwork boards arranged adjacent to each other in the front / rear / left / right direction, straddling between adjacent permanent formwork boards, Since the belt-shaped joint board is bonded to and installed on the back surface side with an adhesive interposed therebetween, it is possible to integrally bond the boards, and this can be used as a seismic reinforcement.
[0016]
The backing plate can be provided with a stepped portion that fits and holds the width direction of the joint board and restricts its movement.
[0017]
In the permanent formwork board, a joint material such as putty-like adhesive can be filled in the joint portion between other permanent formwork boards adjacent to each other.
[0018]
The mounting hole is formed in a long hole shape larger than the diameter of the anchor bolt, and when the backing plate is positioned and the anchor bolt is mounted, putty-like adhesive is placed in the mounting hole. Can be filled.
The backing plate can be bonded and installed on the back side of the joint board via an adhesive.
[0019]
The backing plate is provided with an elastic spacer between the permanent formwork board and fixed so that the joint board is pressed against the back side of the permanent formwork board by screwing the anchor bolt. Can do.
[0020]
Further, the present invention relates to a method for connecting a permanent formwork board that also serves as a barrier plate left on the surface of the cast concrete, and has a length equal to a short side or a long side of the permanent formwork board, and has a predetermined width. Preparing a plurality of strip-shaped joint boards formed on and a backing plate having through tap holes in which screws are provided, corresponding to the mounting holes drilled in the permanent mold board, After the joint board is bonded and installed so that the end in the width direction protrudes on the back side of one of the pair of permanent mold boards that are adjacently arranged in the front-rear and left-right directions and connected to each other, the joint The backing plate is adhered and installed on the back side of the board, and from the surface side of the permanent formwork board, the anchor bolt is screwed into the through tap hole via the mounting hole, and the joint board and The back The plate is then fixed, and then the joint end face of the other permanent formwork boat is brought into contact with the joint part of one permanent formwork board and arranged on the front side of the joint board. From the surface side, an anchor bolt can be screwed into the through tap hole through the mounting hole.
[0021]
According to the connecting method of the permanent formwork board configured in this way, the joint board is bonded to the back side of one of the pair of permanent formwork boards connected to each other so that the end in the width direction protrudes. After installation, the backing plate is attached to the back side of the joint board, and the anchor bolt is screwed into the through-tap hole from the surface side of the permanent formwork board through the mounting hole. Since the backing plate is fixed, the fixing work can be performed without pressing the backing plate from the back side of the formwork board, and the troublesome and difficult work can be eliminated.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 4 show a first embodiment of a connecting structure and a connecting method for a permanent form board according to the present invention.
[0023]
The permanent formwork board 10 shown in the figure is left on the surface of the cast concrete, and is also used as a weir plate that separates the casting range when casting concrete, and is a rectangular flat plate. It is formed in a shape.
[0024]
In the case of the present embodiment, the permanent mold board 10 is a flat plate having a predetermined thickness, for example, about 10 mm, mainly made of cement. More specifically, for example, a high toughness cement board in which reinforcing fibers (PVA fibers having excellent alkali resistance) are randomly oriented two-dimensionally in a cement matrix is preferably used.
[0025]
Such a high toughness cement board has, for example, 3% by weight of reinforcing fibers, 60 to 95% by weight of ordinary cement, 0 to 35% by weight of inorganic minerals, and 2 to 3 of other admixtures. It is comprised so that it may contain by weight.
[0026]
For example, if the thickness is 6 mm, the high toughness cement board having such a blending ratio has a performance of bending strength of 33 MPa, tensile strength of 15 MPa, bending displacement of 22 mm, and performance equivalent to aluminum. .
[0027]
Such a high toughness cement board is, for example, a form plate for constructing a high pier with a lifting support method when it is placed face-to-face with a predetermined interval in addition to a normal form for building a concrete structure. Can be used as
[0028]
When constructing a concrete structure using the permanent formwork boat 10 having the above configuration, before placing concrete, a plurality of formwork boards 10 are arranged adjacent to each other in the front-rear and left-right directions. It is assembled in a connected state so as to exhibit the function as a plate.
[0029]
At this time, the respective formwork boards 10 are arranged adjacent to each other on the same plane so that the joining surfaces of the end portions are joined to each other, and the boards 10 are connected to each other. A plurality of mounting holes 11 used for connection are formed in the outer periphery of each permanent formwork board 10.
[0030]
FIG. 1 and FIG. 2 show a cross section when two permanent mold boards 10 are connected in the vertical direction when connecting between the boards 10 as shown in FIG. State.
[0031]
The joint board 12, the backing plate 14, and the anchor bolt 16 are used for the connection structure and connection method of the permanent mold board 10 of the present embodiment. The joint board 12 is a flat plate formed in a band shape having a predetermined width t, a long joint board 120 having a length substantially the same as the length L1 in the longitudinal direction of the permanent mold board 10, and a permanent mold. The short joint board 121 is shorter than the short direction L2 of the board 10 by a length corresponding to the width t of the long joint boat 120.
[0032]
These joint boards 12 extend over the entire length of the back side along the joints in the vertical and horizontal directions of the plurality of permanent mold boards 10 arranged adjacent to each other in the front and rear, left and right directions, and are adjacent to the permanent boards. Adhesive installation is performed with an adhesive 18 interposed between the formwork boards 10.
[0033]
The long and short joint boards 120 and 121 are used by cutting the permanent formwork board 10 into a predetermined width t and length .
[0034]
In this case, if the same material as the permanent formwork board 10 is used for the joint boards 120 and 121, the adhesive effect by the adhesive 18 becomes uniform on both sides, and the same material is adhered. Therefore, the type of adhesive can be selected. Even no special consideration is required.
In each of the long and short joint boards 120 and 121, through holes 13 are formed so as to correspond to the mounting holes 11 formed in the permanent mold board 10, and in this embodiment, Are arranged so that a pair is opposed on both sides in the width direction.
[0035]
The backing plate 14 is composed of a relatively thin flat plate-shaped metal plate, or a hard plastic plate, a fiber-reinforced synthetic resin plate, and a pair of tap holes 20 are formed through a predetermined interval. The backing plate 14 is attached to the back side of the joint board 12 with an adhesive 18 interposed therebetween.
In the present embodiment, the backing plate 14 is bonded and fixed to the back side of the joint board 12 with the adhesive 18, but the fixing with the adhesive 18 is not necessarily required.
[0036]
In the case of the present embodiment, the backing plate 14 has a length substantially the same as the length of the joint board 12 in the width direction, and is disposed so as to be orthogonal to the longitudinal axis direction of the joint board 12.
[0037]
FIG. 3 shows the specific arrangement state. In the case of the present embodiment, the long joint board 120 is arranged at the central portion in the longitudinal axis direction and at two places on both sides thereof, and the total It is used in three places, and for the short joint board 121, it is used in one place in the central portion in the longitudinal axis direction.
[0038]
On the inner peripheral surface of each tap hole 20, a screw capable of screwing the anchor bolt 16 is provided. The tap holes 20 are arranged at a predetermined interval so as to correspond to the mounting holes 11 of the permanent mold board 10 and the through holes 13 of the joint board 12.
[0039]
The tap hole 20 can be provided directly when the backing plate 14 is made of a metal plate. For example, when a plastic plate is used, the tap hole 20 is formed by a separate member. This may be insert molded.
[0040]
In addition, cylindrical protective sleeves 22 are fitted into the mounting holes 11 of the permanent mold board 10 and the through holes 13 of the joint board 12, respectively. The protective sleeves 22 can be inserted into the anchor bolts 16. It has an inner diameter.
[0041]
The anchor bolt 16 is tapped from the surface side of the permanent mold board 10 through the mounting hole 11 and the through hole 13 in a state where the joint board 12 and the backing plate 14 are installed on the back side of the permanent mold board 10. It is screwed into the hole 20 and buried in the concrete to be placed thereafter.
[0042]
In this case, the tip of each anchor bolt 16 is screwed to the back side of the backing plate 14 so that the tip protrudes by a predetermined length. When the anchor bolt 16 is screwed in this way, FIG. As shown in FIG. 3, the connection of the plurality of permanent formwork boards 10 is completed. In the connection structure shown in FIG. 2, the adhesive 18 is interposed at the joining ends of the permanent mold boards 10.
[0043]
According to the connection structure of the permanent mold board 10 configured as described above, it extends along the entire length of the back side along the joint portion of the plurality of permanent mold boards 10 arranged adjacent to each other in the front-rear and left-right directions. Since the belt-like joint board 12 is bonded and installed with the adhesive 18 so as to straddle between the adjacent permanent formwork boards 10, the boards 10 can be integrally joined, and this is seismic resistant. Can be used as reinforcement.
[0044]
Next, a method for connecting the permanent formwork board 10 will be described. When connecting the formwork board 10, the long and short joint boards 120 and 121 having the above-described configuration are prepared.
[0045]
First, as shown in FIG. 3, the long and short joint boards 120 and 121 are bonded and installed on the two sides on the back side of the permanent mold board 10 installed on the lower side using an adhesive 18. .
[0046]
At this time, each of the joint boards 120 and 121 has approximately half of the end portion in the width direction protruding upward or laterally, and the through hole 13 is made to coincide with the mounting hole 11. Next, the backing plate 14 is bonded and fixed to the back side of each joint board 120, 121 with an adhesive 18.
At this time, the tap hole 20 is aligned with the through hole 13, and then the anchor bolt 16 is inserted into the mounting hole 11 and the through hole 13 from the surface side of the permanent mold board 10 and screwed into the tap hole 20. To do.
[0047]
When the anchor bolts 16 are attached to the respective mounting holes 11, the joint board 12 and the backing plate 14 are attached to the back side of the permanent mold board 10 as shown in FIG. 18 is fixed by adhesion, and is mechanically clamped and fixed by screwing anchor bolts 16.
[0048]
Next, the adhesive 18 is applied to the protruding portion of the long joint board 120 (the portion protruding upward from the end face of the joint portion of the lower permanent mold board 10), and the next permanent mold board 10 is attached. When the anchor bolts 16 are inserted into the attachment holes 11 and the through holes 13 from the surface side of the permanent formwork board 10 and screwed into the tap holes 20, the two permanent formwork boards 10 are formed. Connected vertically.
[0049]
In this case, when installing the next permanent formwork board 10, you may apply | coat the adhesive agent 18 to the joining end surface between the lower formwork boards 10, and may adhere both. Moreover, when connecting the permanent formwork board 10 to the side, substantially the same procedure as the above procedure is executed, and by repeating such a procedure a plurality of times, it also serves as a dam plate for placing concrete. A formwork is formed.
[0050]
According to the connecting method of the permanent mold board 10 configured as described above, the end in the width direction protrudes from the back side of one of the pair of permanent mold boards 10 to be connected to each other. After the board 12 is bonded and installed, the backing plate 14 is bonded and installed on the back surface side of the joint board 12, and the anchor bolt 16 is passed through the attachment hole 11 from the front surface side of the permanent formwork board 10 and the through tap hole. Since the joint board 12 and the backing plate 14 are fixed by being screwed to the fixing plate 20, the fixing work can be performed without pressing the backing plate 14 from the back side of the formwork board 10, and it is troublesome. It becomes possible to eliminate difficult work.
[0051]
FIG. 5 shows a second embodiment of the structure for fixing a permanent mold board according to the present invention, and the same or corresponding parts as those in the above embodiment are given the same reference numerals and the description thereof is omitted. Only the feature points will be described below.
[0052]
In the embodiment shown in the figure, in the first embodiment shown in FIG. 2, the adhesive 18 is interposed between the joining end portions of the permanent formwork boards 10, but in the case of this embodiment, Instead of the adhesive 18, a joint material 26 such as a flexible putty adhesive is used.
[0053]
When such a joint material 26 is used, when the permanent formwork board 10 is expanded and contracted due to a temperature change or the like after the installation, the joint material 26 is deformed to allow this and alleviate the harmful effects caused by the expansion and contraction. it can.
[0054]
FIG. 6 shows a third embodiment of the fixing structure of the permanent mold board according to the present invention. The same or corresponding parts as those in the above embodiment are given the same reference numerals and the description thereof is omitted. Only the feature points will be described below.
[0055]
In the embodiment shown in the figure, the backing plate 14a is arranged on the back side of the joint board 12a as in the above-described embodiment, but the width of the joint board 12a is substantially at the center of the backing plate 14a. A step 28 is provided in which the direction is fitted.
[0056]
The step portion 28 is fitted and held in the width direction of the joint board 12a, so that movement in the width direction is restricted. In the case of the present embodiment, the joint board 12a is composed of long and short joint boards having substantially the same length as the long and short sides of the permanent formwork board 10 as in the above embodiment. The joint board is not provided with an equivalent to the through hole 13 of the above embodiment.
[0057]
In the case of this embodiment, an adhesive 18 is interposed between the joint board 12a and the permanent mold board 10, but between the joint board 12a fitted in the step portion 28. Is provided with a cushioning material 32 (sponge) in which the bottom surface side of the stepped portion 28 is an adhesive layer 30.
[0058]
According to the fixing structure of the permanent form board configured in this way, the width direction of the joint board 12a is fitted and held on the step portion 28 of the backing plate 14a, and the movement thereof is restricted. The integrity between the formwork boards 10 is further strengthened, and the effect as seismic reinforcement is increased.
[0059]
FIG. 7 shows a fourth embodiment of the structure for fixing a permanent mold board according to the present invention, and the same or corresponding parts as those in the above embodiment are designated by the same reference numerals and the description thereof is omitted. Only the feature points will be described below.
[0060]
In the embodiment shown in the figure, the attachment hole 11 a formed in the permanent formwork board 10 is formed in a long hole shape larger in diameter than the diameter of the anchor bolt 16. In the example shown in FIG. 7, such mounting holes 11 a are used only for the upper-side mold board 10 among the mold boards 10 connected in the vertical direction, but are used for all the mounting holes. May be.
[0061]
In the case of such a mounting hole 11a, when connecting the formwork board 10, the backing plate 14a is positioned, and when the anchor bolt 16 is mounted, the putty-like adhesive 34 is placed in the mounting hole 11a. After that, the anchor bolt 16 is inserted into the mounting hole 11a and screwed into the tap hole 20.
When such an attachment hole 11a is employed, the anchor bolt 16 can be fixed to the formwork board 10 more firmly.
[0062]
FIG. 8 shows a fifth embodiment of the fixing structure of the permanent mold board according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals and the description thereof is omitted. Only the feature points will be described below.
[0063]
In the case of the present embodiment, the backing plate 14 c is interposed between the permanent formwork board 10 and an elastic spacer 36 made of rubber or the like, and the spacer 36 is clamped by screwing the anchor bolt 16. The joint board 12a is fixed so as to press against the back side of the permanent formwork board 10 by the elastic force obtained in the above.
[0064]
When such a configuration is adopted, the joint board 12a bonded and fixed to the back side of the permanent formwork board 10 is pressed by the elastic force of the elastic spacer 36, so that the joined formwork board 10 is integrated. The property becomes even stronger.
[0065]
In this embodiment, the elastic spacer 36 has a hole 13a corresponding to the through hole 13 shown in the first embodiment.
[0066]
【The invention's effect】
As described above in detail, according to the connecting structure and connecting method of permanent mold boards according to the present invention, the boards can be integrally joined and the connecting work can be easily performed.
[Brief description of the drawings]
FIG. 1 is an explanatory sectional view of an initial process showing a first embodiment of a method for connecting permanent formwork boards according to the present invention.
FIG. 2 is a cross-sectional explanatory diagram of a connection end state of the connection method shown in FIG. 1;
3 is a rear view of FIG. 1. FIG.
4 is a front view of FIG. 3;
FIG. 5 is a cross-sectional view of a principal part showing a second embodiment of the connection structure of the permanent form board according to the present invention.
FIG. 6 is a cross-sectional view of an essential part showing a third embodiment of the connection structure of the permanent form board according to the present invention.
FIG. 7 is a cross-sectional view of a principal part showing a fourth embodiment of a connection structure for permanent mold boards according to the present invention.
FIG. 8 is a cross-sectional view of a principal part showing a fifth embodiment of a connection structure for permanent mold boards according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Permanent formwork board 11, 11a Mounting hole 12, 12a Joint board 120 Long joint board 121 Short joint board 14, 14a Backing plate 16 Anchor bolt 18 Adhesive 20 Tap hole

Claims (7)

In the connection structure of the permanent formwork board that is also used as the dam plate left on the surface of the cast concrete,
An adhesive that extends across the entire length of the back side of the permanent form board, and extends along the joints of the plurality of permanent form boards that are adjacently arranged in the front-rear and left-right directions. A band-shaped joint board that is installed by bonding,
Corresponding to the mounting hole drilled in the permanent mold board, there is a through tap hole in which a screw is provided, and a backing plate attached to the back side of the joint board;
In the state where the joint board and the backing plate are installed on the back side of the permanent formwork board, from the surface side of the permanent formwork board, it is screwed to the through tap hole through the attachment hole, The portion that penetrates the permanent formwork board, the joint boat and the backing plate and protrudes from the tap hole has an anchor bolt embedded in the cast concrete,
The joint board is formed by cutting the permanent form board into a predetermined width and length and using the joint form board. 2. The connection structure for a permanent form board according to claim 1, wherein the backing plate has a step portion that fits and holds the width direction of the joint board and restricts the movement thereof . The permanent formwork board according to claim 1 or 2 , wherein the permanent formwork board is filled with a joint material such as putty-like adhesive at the joint portion between other permanent formwork boards. Connection structure. The mounting hole is formed in a long hole shape larger than the diameter of the anchor bolt, and when the backing plate is positioned and the anchor bolt is mounted, putty-like adhesive is placed in the mounting hole. The permanent form board connection structure according to any one of claims 1 to 3, wherein the structure is filled . The said backing plate is adhere | attached and installed through the adhesive agent on the back side of the said joint board, The connection structure of the permanent form board of any one of Claim 1 to 4 characterized by the above-mentioned. The backing plate is fixed so that an elastic spacer is interposed between the backing plate and the permanent formwork board, and the joint board is pressed against the back side of the permanent formwork board by screwing the anchor bolt. The connection structure for a permanent form board according to any one of claims 1 to 5 . In the method of connecting the permanent formwork boards that are also used as barrier plates to be left on the surface of the cast concrete, a plurality of sheets having the same length as the short side or the long side of the permanent formwork board and having a predetermined width A strip-shaped joint board and a backing plate having a through tap hole in which a screw is provided corresponding to the mounting hole drilled in the permanent formwork board are prepared and arranged adjacent to each other in the front-rear and left-right directions. Then, on the back side of one of the pair of permanent mold boards that are connected to each other, after the joint board is bonded and installed so that the end in the width direction protrudes, on the back side of the joint board, The backing plate is adhered and installed, and from the surface side of the permanent formwork board, the anchor bolt is screwed into the through tap hole via the mounting hole, and the joint board and the backing plate are attached. Then, the joining end face of the other permanent formwork boat is placed in contact with the joining part of one permanent formwork board and arranged on the front side of the joint board, from the surface side of the permanent formwork board A method for connecting a permanent form board, wherein an anchor bolt is screwed into the through tap hole through the mounting hole.

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