JP4019798B2 - Permanent formwork board connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure for permanent form boards, and more particularly to a technique for ensuring water-stopping between permanent form boards that also serve as dam plates and remain 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. The same thing is used.
[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, regarding the water-stopping treatment between the mold boards, no special measures have been taken, and there was concern about ensuring water-stopping when water-stopping is required.
The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a connection structure for permanent form boards that can ensure water-stopping between boards.
[0011]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a plurality of permanent molds that are arranged adjacent to each other in the front-rear and left-right directions in a connection structure for a permanent mold board board joint that also serves as a dam plate that is left on the surface of cast concrete. A strip-shaped water-stopping material interposed over the entire length of the back surface of the permanent formwork board so as to straddle between the adjacent permanent formwork boards along the joining portion of the board, and the permanent formwork board. In correspondence with the mounting holes, there are through tap holes in which screws are provided, a backing plate attached to the back side of the water blocking material, and on the back side of the permanent formwork board, With the water-stopping material and the backing plate disposed, the permanent mold board and the backing plate are screwed into the tap hole through the mounting hole from the surface side of the permanent mold board. The portion that penetrates and protrudes from the tap hole is Has an anchor bolt embedded in the set concrete, the mounting hole, the formed into large-diameter elongated hole than the diameter of the anchor bolt, and positioning the backing plate, mounting the anchor bolt At this time, a putty-like adhesive was filled in the mounting hole .
[0012]
According to the connection structure of the permanent formwork board joint portion configured as described above, a belt-like water-stopping material is interposed over the entire length of the back side so as to straddle between adjacent permanent formwork boards, and With the water material and backing plate arranged, anchor bolts are screwed into the tap holes from the surface side of the permanent formwork board through the mounting holes to penetrate the permanent formwork board and the backing plate. Since the portion protruding from the tap hole is embedded in the cast concrete, the water stoppage between the formwork boards can be ensured by the waterstop material.
[0013]
The water stop material may be formed of a water stop tape such as a gap sponge tape bonded to the back side of the permanent formwork board.
[0014]
The water stop material may be composed of a non-vulcanized butyl rubber water stop plate.
[0015]
The backing plate may be provided with a recess that accommodates the non-vulcanized butyl rubber waterstop.
[0016]
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]
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. FIG. 1 shows a first embodiment of a connecting structure for a permanent form board according to the present invention.
[0019]
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.
[0020]
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.
[0021]
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.
[0022]
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. .
[0023]
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
[0024]
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.
[0025]
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. In the connection structure, the band-shaped waterstop material 12, the backing plate 14, and the anchor bolt 16 are used for connection.
[0026]
A plurality of mounting holes 18 used for this connection are formed on the outer peripheral side of each permanent mold board 10, and both ends of the mounting holes 18 into which the anchor bolts 16 can be inserted. A protective sleeve 20 having an opening is inserted.
[0027]
In the case of the present embodiment, the water-stopping material 12 uses a gap sponge tape in which an adhesive is provided on one side, and the water-stopping material 12 is a plurality of permanent molds arranged adjacent to each other in the front-rear and left-right directions. Along the joint portion of the frame board 10, it is interposed over the entire length of the back surface side so as to straddle between the adjacent permanent mold boards 10.
[0028]
The backing plate 14 is composed of a relatively thin flat plate-shaped metal plate, a hard plastic plate, or a fiber reinforced synthetic resin plate, and a pair of through tap holes 22 are formed to penetrate at a predetermined interval. The backing plate 14 is attached to the back side thereof so as to be orthogonal to the longitudinal direction of the water blocking material 12.
[0029]
The through-tap hole 22 is internally provided with a screw to which the anchor bolt 16 can be screwed, and is arranged so as to correspond to the mounting hole 18 formed in the permanent mold board 10.
[0030]
The anchor bolt 16 is screwed into the through tap hole 22 from the front surface side of the permanent formwork board 10 through the mounting hole 18 and is disposed so as to protrude rearward from the back surface side of the backing plate 14.
[0031]
When the anchor bolt 16 is screwed to the backing plate 14 in this way, the waterstop 12 is sandwiched between the back surface of the permanent mold board 10 and the front surface of the backing plate 14 in a compressed state. .
[0032]
FIGS. 2 and 3 show a cross-section and a front state when two permanent mold boards 100 and 101 are connected in the vertical direction when such boards 10 are connected. FIG. 3 shows a completed connection state.
[0033]
When connecting the two permanent formwork boards 100 and 101 in the vertical direction, first, the water stop material 12 is attached to the back side of the lower formwork board 100 as shown in FIG.
At this time, the length in the width direction of the water-stopping material 12 is protruded upward from the upper end of the board 100 so as to stick along the entire length of the lower formwork board 100. .
[0034]
Next, the pair of backing plates 14 are set so as to be orthogonal to the longitudinal direction of the water-stopping material 12, and are attached from the back side with a predetermined interval along the longitudinal direction. At this time, the through tap holes 22 of the backing plates 14 are set so as to correspond to the mounting holes 18 formed in the board 100, and the mounting holes 18 are formed from the surface side of the lower mold board 100. Then, the anchor bolts 16 are respectively screwed into the lower through tap holes 22, and the water stop material 12 is sandwiched and fixed between the board 100 and the backing plate 14.
[0035]
When the clamping and fixing of the waterstop material 12 is completed, next, as shown in FIG. After alignment with the tap hole 22, the anchor bolt 16 is screwed into the lower through tap hole 22 from the surface side of the upper formwork board 101 via the mounting hole 18, respectively. 12 is sandwiched and fixed between the board 101 and the backing plate 14, the state shown in FIG. 1 is obtained, and the connection between the two mold boards 100, 101 is completed. By placing the concrete C on the back side of the 101, the anchor bolt 16 is embedded in the cast concrete C.
[0036]
Now, according to the connection structure of the permanent formwork board joint portion configured as described above, the strip-shaped water-stopping material 12 is provided over the entire length of the back side so as to straddle between the adjacent permanent formwork boards 10. The anchor bolt 16 is screwed into the tap hole 22 through the mounting hole 18 from the surface side of the permanent formwork board 10 with the water-stopping material 12 and the backing plate 14 disposed. Since it embeds in concrete, the water stoppage between the formwork boards 10 can be ensured by the waterstop material 12.
[0037]
FIG. 4 shows a second embodiment of the connection structure of the permanent form board according to the present invention. The same or corresponding parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. In addition, only the feature points will be described in detail below.
[0038]
In the embodiment shown in the figure, as in the above-described embodiment, a water stop material 12a, a backing plate 14a, and anchor bolts 16a are used to connect the formwork board 10a. The water stop material 12a includes a gap sponge. Tape is adopted.
[0039]
And the joint material 24 which consists of putty-like adhesive etc. is interposed in the junction part between the adjacent formwork boards 10a. Further, in the case of the present embodiment, the mounting hole 18a of the formwork board 10a disposed on the upper side is formed as a long hole larger than the diameter of the anchor bolt 16a, and the backing plate 14a is used as a water blocking material. When the anchor bolt 16a is mounted after being positioned on the back side of 12a, the putty-like adhesive 26 is filled into the mounting hole 18a.
[0040]
According to the embodiment configured as described above, since the joint material 24 is interposed at the joint between the mold boards 10a, when the permanent mold board 10a expands and contracts due to a temperature change or the like after installation, the joint material 24 is joined. The material 24 can be deformed and allowed, and the adverse effects caused by expansion and contraction can be alleviated, and the joint material 24 can also provide a primary water stop effect between the boards 10a.
[0041]
Further, in the case of the present embodiment, since the putty-like adhesive 26 is filled in the long hole-like mounting hole and the anchor bolt 16a is inserted therein, the anchor bolt 16a is more firmly molded. In addition to being able to be fixed to the frame board 10 and adopting this configuration for all the anchor bolts 16a, the gap between the anchor bolts 16a and the mounting holes 18a is also sealed with the adhesive 26 to further improve the water stoppage. Can be made.
[0043]
FIG. 5 shows a third embodiment of the connection structure of the permanent form board according to the present invention, and the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted. Only the feature points will be described below.
[0044]
In the case of the present embodiment, as in the above embodiment, the water stop material 12b, the backing plate 14b, and the anchor bolt 16b are used for the connection of the mold board 10b, and the water stop material 12b has a predetermined width. Non-vulcanized butyl rubber-based waterstop plates are used.
[0045]
Such a water stop plate is a non-vulcanized adhesive plastic body using butyl recycled rubber, which has excellent water resistance and chemical resistance, is self-adhesive, and is boarded under conditions where moisture exists. When contacted with 10b, the metal oxide contained in the cement of the board 10b becomes a metal hydroxide, which can ionically react with the active group of the water stop plate to cause chemical bonding, for example, span seal (Trade name, manufactured by Hayakawa Rubber Co., Ltd.) can be used.
[0046]
Further, the backing plate 14b is provided with a concave portion 28 in the central portion in the longitudinal direction for fitting and accommodating the width direction of the water blocking material 12b. FIGS. 6 and 7 show a cross-section when the two permanent mold boards 100b and 101b are connected in the vertical direction and the state of the back surface when such a connection between the boards 10b is performed. FIG. 7 shows a completed connection state.
[0047]
When connecting the two permanent mold boards 100b and 101b in the vertical direction, first, as shown in FIG. 6, a water blocking material 12b is disposed on the back side of the lower mold board 100b.
[0048]
In this case, the water sealant 12b made of span seal is previously attached to the inner surface of the recess 28 so as to straddle the pair of backing plates 14b, and the length in the width direction is approximately half of the board 100b. It sticks to the full length along the length direction of the lower formwork board 100b so that it may protrude upward from an upper end.
[0049]
At this time, the through tap holes 22b of the backing plates 14b are set so as to correspond to the mounting holes 18b formed in the board 100b, and the mounting holes 18b are formed from the surface side of the lower mold board 100b. Then, the anchor bolts 16b are respectively screwed into the lower through tap holes 22b, and the water stop material 12b is sandwiched and fixed between the board 100b and the backing plate 14b.
[0050]
When the clamping of the water blocking material 12b is completed, as shown in FIG. 7, next, the upper mold board 101b is built on the upper end side of the lower mold board 100b, and penetrates through the mounting hole 18b of the upper mold board 101b. After alignment with the tap hole 22b, the anchor bolt 16b is screwed from the surface side of the upper formwork board 101b to the lower through tap hole 22b via the mounting hole 18b, respectively, When 12b is sandwiched and fixed between the board 101b and the backing plate 14b, the state shown in FIG. 5 is obtained, and the connection between the two formwork boards 100b and 101b is completed. By placing concrete C on the back side of 101b, the anchor bolt 16b is embedded in the cast concrete C.
[0051]
According to the present embodiment, the water stop material 12b made of a non-vulcanized butyl rubber type water stop plate is chemically bonded to the board 10b, so that the water stop of the joint between the boards 10b is ensured and the water stop is stopped. Since the water material 12b is fitted in the recess 28 of the backing plate 14b, movement of the water stop material 12b in the width direction is restricted, and as a result, the water stop material 12b can be accurately placed at a predetermined position. Since it can do, water stoppage can be ensured more reliably.
[0052]
【The invention's effect】
As described above in detail, according to the connection structure of the permanent form board according to the present invention, it is possible to ensure the water stoppage between the boards.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view showing a first embodiment of a connection structure for permanent mold boards according to the present invention.
2 is a cross-sectional view and a front explanatory view of an initial step of a connection method for obtaining the connection structure shown in FIG. 1; FIG.
FIGS. 3A and 3B are a cross-sectional view and a front explanatory view of a final process of a connection method for obtaining the connection structure shown in FIG. 1;
FIG. 4 is an explanatory cross-sectional view showing a second embodiment of the connection structure of the permanent mold board according to the present invention.
FIG. 5 is an explanatory cross-sectional view showing a third embodiment of the connection structure of the permanent form board according to the present invention.
6 is a cross-sectional and backside explanatory view of an initial step of a connection method for obtaining the connection structure shown in FIG. 5;
7 is a cross-sectional and backside explanatory view of the final step of the connecting method for obtaining the connecting structure shown in FIG. 5;
[Explanation of symbols]
10, 10a, 10b Permanent formwork board 12, 12a, 12b Water blocking material 14, 14a, 14b Backing plate 16, 16a, 16b Anchor bolt 18, 18a, 18b Mounting hole 22, 22a, 22b Through tap hole

Claims (5)

In the connection structure of the permanent formwork board joint that also serves as a dam plate left on the surface of the cast concrete,
A belt-shaped belt that is interposed over the entire length of the back surface side so as to straddle between the adjacent permanent mold boards along the joint portions of the plurality of permanent mold boards that are adjacently arranged in the front-rear and left-right directions. A waterstop material,
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 water stop material,
With the water-stopping material and the backing plate arranged on the back side of the permanent formwork board, from the surface side of the permanent formwork board, it is screwed into the tap hole through the mounting hole, A portion that penetrates the permanent formwork board and the backing plate and protrudes from the tap hole has an anchor bolt embedded in the placing concrete ,
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. Permanent formwork board connection structure characterized by filling . 2. The permanent mold board connection structure according to claim 1, wherein the water stop material is formed of a water stop tape such as a gap sponge tape bonded to the back side of the permanent mold board. 2. The permanent frame board connection structure according to claim 1, wherein the water stop material is a non-vulcanized butyl rubber water stop plate. The said backing plate has a recessed part which accommodates the said non-vulcanized butyl rubber-type waterstop board, The connection structure of the permanent form board of Claim 3 characterized by the above-mentioned. The said permanent formwork board is filled with joint materials, such as putty-like adhesive, in the said junction part between other adjacent permanent formwork boards. Permanent formwork board connection structure.

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