JPH0532588U - Concrete form holder - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent rainwater from entering the inside of the concrete through the outer periphery of the concrete form spacing tool. [Structure] A tubular concrete mold interval holder 2 is arranged between the molds 1 on both sides. Tighten the molds 1 on both sides using the separator 3, the connecting fixture 4, the tightening fittings 5, the support 6, the tightening washers 7 and the nuts 8 inserted into the concrete mold spacing holders 2. . The concrete frame interval holder 2 is composed of a pipe 9 and end stoppers 10 at both ends of the pipe 9. A donut disk-shaped water stopping member 11 is attached between the exterior member 12 and the pressing member 13 which form the end stopper 10. The water blocking member 11 has a diameter larger than that of the exterior member 12 and is formed of a material having elasticity such as rubber. The water stop member 11 is brought into close contact with the concrete by its elastic force, and rainwater is prevented from entering inside the position of the water stop member 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a concrete mold holding device for clamping and holding a mold at the time of concrete casting, and in particular, a cylindrical concrete mold space provided between a pair of molds. The present invention relates to a waterproof structure of an outer peripheral portion of a holder.

[0002]

[Prior Art]

 Conventionally, as a concrete mold holding device for holding a pair of facing molds at a predetermined interval, for example, Japanese Utility Model Publication No. 1-109537, Japanese Utility Model Publication No. 1-163646, or Japanese Utility Model Publication No. 2-64652. As disclosed in the official gazette, a cylindrical concrete form spacing holder is inserted between a pair of facing molds, and a separator inserted in the concrete form spacing holder. -It is known that the molds on both sides are connected via a cable.

[0003]

[Problems to be solved by the device]

 By the way, since the concrete mold interval retainer is interposed between the pair of molds, the concrete is naturally cast on the outer peripheral portion thereof, but the concrete Since the mold form spacing tool has a constant outer dimension, when a concrete is placed between the molds, a gap is formed on the lower surface side of the concrete form spacing tool. May occur (a bleeding phenomenon). In particular, since the outer shapes of both ends of the concrete form spacing holder are generally larger than those of the other parts, a gap is likely to occur in this part.

When the gap is formed, rainwater or the like intrudes into the gap from the outside, or dew condensation water is generated due to a temperature difference between the inside and outside of the concrete wall. There is a problem that the metal member corrodes and expands, causing cracks in the concrete wall.

[0005] Therefore, it is important to perform construction so as not to create a gap in the outer peripheral portion of the concrete form space retainer, but it is practically impossible to construct without creating a gap. Even if a gap is created, it is necessary to prevent rainwater and the like from entering the interior of the concrete wall through the outer periphery of the concrete form spacing tool.

The present invention has been made in view of the present situation, and even if a gap is created between the outer peripheral surface of the concrete form space retainer and the concrete, the infiltrated rainwater Alternatively, it is another object of the present invention to provide a concrete form holding device that does not cause cracks in the concrete wall due to dew condensation water.

Another object of the present invention is to provide a concrete mold holding device which can easily manufacture a concrete mold gap holder and can obtain a sufficient water blocking effect.

[0008] Another object of the present invention is to provide a concrete form space keeping device capable of improving the adhesion between the end stopper and the concrete and suppressing the generation of the gap as much as possible.

Still another object of the present invention is to provide a concrete form holding device capable of further improving the water blocking effect of the water blocking member.

[0010]

[Means for Solving the Problems]

 As a means for achieving the above-mentioned object, the present invention interposes a tubular concrete mold space holder between a pair of facing molds, and in this concrete mold space holder. In a concrete mold holding device for connecting molds on both sides via a separator inserted in a container, a flange-shaped water blocking member having elasticity is provided on an outer peripheral portion of the concrete mold space holder. Is provided.

Further, in the present invention, the concrete frame interval holder comprises a pipe and tubular end stoppers arranged at both ends of the pipe, respectively, and a water blocking member is provided. It is preferable to provide it on at least one of the end stoppers.

Further, it is preferable that at least a main part of the end stopper is made of ceramics, and at least the outer end surface of the end stopper is waterproofed.

Further, the water blocking member is a water-expandable hard rubber formed by compounding synthetic rubber and a highly water-absorbent resin, or an independent cell formed by vulcanization molding of this water-expandable hard rubber. It is preferably made of foam.

[0014]

[Action]

 In the concrete mold holding device according to the present invention, the flange-shaped waterproofing member having elasticity is provided on the outer peripheral portion of the concrete mold spacing holder. Then, the cast concrete is solidified while the water blocking member is pressed toward the center side. For this reason, sufficient adhesion is obtained between the outer surface of the water blocking member and the concrete, and a gap is created between the outer surface of the concrete form frame gap holder and the concrete. Also, water can be stopped at the position of the water blocking member.

Further, in the present invention, the concrete frame interval holder comprises a pipe and tubular end stoppers respectively arranged at both ends of the pipe, and the waterproof member is reduced in number. By providing at least one of the end stoppers, a sufficient water-blocking effect can be obtained without hindering the form holding work, and the concrete can be simply changed by changing the length of the pipe. Can accommodate changes in wall thickness.

Further, by forming the end stopper from ceramics, the adhesion to the concrete is improved, and it is possible to suppress the formation of a gap between the concrete and the thermal expansion and contraction. Since it does not exist, it is possible to prevent the concrete from cracking due to thermal deformation. By waterproofing at least the outer end surface of the end stopper, it is possible to prevent rainwater and the like from entering through the inside of the end stopper.

Furthermore, by making the water blocking member from water-expandable expanded hard rubber or its closed-cell foam, the water blocking member expands upon contact with water, and its adhesion to the concrete is improved. Is further improved, and sufficient water-stopping effect can be obtained even in locations where large water pressure acts.

[0018]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows an example of a concrete mold holding device according to the present invention. This device is a cylindrical concrete mold which is interposed between a pair of facing molds 1, 1. The space holder 2, the separator 3 inserted in the concrete frame space holder 2, the connecting fixture 4 connected to one end of the separator 3, and the separator 3. Each of the molds 1 is provided with a support member 6 on the outer surface thereof, and the support member 6 is tightened. The nut 8 is tightened via the washer 7 so that it can be held in the state shown in the figure.

As shown in FIGS. 1 to 3, the concrete frame interval holder 2 is made of, for example, a synthetic resin pipe 9 and cylindrical end stoppers arranged at both ends of the pipe 9. The body 10 is provided, and a flange-shaped water stop member 11 having elasticity is provided on the outer peripheral portion of each end stop 10.

As shown in FIGS. 3 and 4, each of the end stoppers 10 has a ceramic exterior member 12 in the form of a taper cylinder whose outer surface is reduced in diameter toward the outer end next. The outer member 12 is provided with a pressing member 13 which is inserted from the inner end side and is fixed with an adhesive, for example, which is made of metal and has a cylindrical shape. The flange portion 13a provided on the inner end of the pressing member 13 and the inner end surface of the exterior member 12 are sandwiched and fixed.

As shown in FIGS. 3 and 4, the outer surface of the outer member 12 is waterproofed by, for example, applying a waterproofing agent, and the outer surface of the outer member 12 is covered. Has a roughened surface 15. The waterproofing 14 makes it possible to completely prevent rainwater and the like from entering the concrete wall through the inside of the exterior member 12, and the roughening 15 As a result, the adhesion between the exterior member 12 and the concrete can be further improved.

Further, as shown in FIGS. 3 and 4, the water blocking member 11 is in the shape of a donut disc having a predetermined thickness, and its outer shape is the outer end of the outer member 12. It is formed in a larger size than the outer shape of the above, and a step portion 16 is formed between it and the exterior member 12. Then, even if a gap G is formed at the lower end of the exterior member 12 by the step portion 16 as shown in FIG. 3, the water in the gap G infiltrates inside the exterior member 12 as a result. It is possible to prevent this.

The water blocking member 11 is a water-expandable hard rubber formed by compounding synthetic rubber and a superabsorbent resin, or closed-cell foam formed by vulcanization molding of this water-expandable hard rubber. It is made of a body (for example, trade name: NW Sealer, Nishikawa Rubber Co., Ltd.), and this water stop member 11 is made from the concrete that is placed by the elastic force of its own. The diameter is elastically reduced by the pressure, and after the concrete is solidified, the elastic restoring force makes it completely adhere to the concrete so that no gap is created between the concrete and the concrete. .. Further, when the water blocking member 11 gets wet with the water in the gap G shown in FIG. 3, the water blocking member 11 expands and the adhesion with the concrete is further improved.

On the other hand, as shown in FIG. 2, the separator 3 is formed in a round bar shape having a flange portion 17 on one end side, and an end portion on the opposite side of the flange portion 17 is formed. A male screw portion 18 to be screwed into the connecting fixture 4 which will be described in detail later is provided, and a male screw portion 18 having, for example, a square pillar-shaped locking portion 19 at its tip is provided outside the flange portion 17 described above. 20 are provided. The locking portion 19 is used when the separator 3 is rotated by an electric tool (not shown).

As shown in FIG. 1, the connecting fixture 4 is composed of a female screw portion 4b having a flange portion 4a at its inner end, and a male screw portion 4c connected to the tip of the female screw portion 4b. As a result, four detents 4d are provided on the inner peripheral portion of the female screw portion 4b at equal intervals in the circumferential direction. Then, the connecting fixture 4 is driven into the hole 1a of the mold 1 from the inside so as to be fixed in the hole 1a while being prevented from rotating.

As shown in FIG. 1, the male screw portion 18 of the separator 3 is screwed to the female screw 4 b of the connecting fixture 4, and the male screw portion of the connecting fixture 4 is also attached. 4c is configured such that after the washer 21 is mounted, the female screw portion 5a of the tightening fitting 5 is screwed, and the male screw portion 5b is mounted with the tightening washer 7, and then the nut 8 is attached. It is supposed to be screwed. A locking portion 22 similar to the locking portion 19 is provided at the tip of the male screw portion 5b so that it can be operated by an electric tool (not shown).

Next, the operation of this embodiment will be described. In assembling the molds 1 and 1, first, the connection fixing tool 5 is driven into the hole 1a of one of the molds 1 from the inside, and the fastening metal fitting 5 is screwed and connected to the outside thereof via the washer 21. Then, the form 1 is connected by the support member 6, the tightening washer 7 and the nut 8 to form a large-sized panel.

Next, the male screw portion 18 of the separator 3 on which the concrete form spacing member 2 is attached is screwed and connected to the female screw portion 4 b of the connecting fixture 4, and the male screw of the separator 3 is also attached. The part 20 is inserted into the hole 1a of the other mold 1. Then, the tightening fitting 5 is screwed and connected to the male screw portion 20.

Next, the support member 6 is arranged on the outer surface side of the mold 1, the support member 6 is pressed by the tightening washer 7, and the nut 8 is screwed onto the male screw portion 5 b of the tightening fitting 5. Tighten. As a result, the mold 1 is held, and the assembly of the pair of molds 1, 1 is completed. Then, a concrete is placed between the molds 1 and 1.

When disassembling the molds 1 and 1, first, the nut 8 shown on the left side of FIG. 2 is removed, and the tightening washer 7 and the support member 6 are removed. Then, after that, the fastening metal fitting 5 is loosened and removed from the separator 3, and the mold 1 on the left side of FIG. 2 is removed. Then, after that, the separator 3 is loosened, removed from the connecting fixture 4, and pulled out from the concrete form spacing holder 2.

In this way, if the left side mold 1 in FIG. 2 is removed, then the right side mold 1 in FIG. 2 is removed as a large panel. The formwork 1 that has been made into a large-sized panel is moved as it is and used as it is as a formwork of other parts. This makes assembly and dismantling extremely easy, and since it is not necessary to dismantle into individual formwork 1, even when there is a building near the outside of the formwork 1 on the right side of FIG. You can work without any problems.

Next, the inside of the concrete mold interval holder 2 is sealed by, for example, the method proposed by the present inventors in Japanese Patent Application No. 3-135632.

By the way, when a concrete is cast between the molds 1 and 1, the water blocking member 11 of the concrete mold interval holder 2 is placed on the outer surface side due to the pressure from the cast concrete. Is pressed almost evenly and elastically reduces its diameter. After the concrete is solidified, the water blocking member 11 constantly presses the concrete due to its elastic return force, so that the concrete completely adheres to the concrete.

However, even if a gap G is created at the lower end of the stopper 10 as shown in FIG. 3 due to insufficient vibration of the concrete, etc. Therefore, it is possible to completely prevent rainwater and the like from entering the inside. In addition, the water blocking member 11 is larger than the exterior member 12 and protrudes toward the outer peripheral side in a flange shape, and the step portion 16 is formed between the two, so that the both are flush with each other. , A greater water stopping effect can be obtained.

Further, since the water blocking member 11 is made of water-expandable hard rubber or its closed-cell foam, the water blocking member 11 expands when it comes into contact with water, and the adhesion with the concrete is further improved. .. For this reason, an extremely large water blocking effect can be obtained, and the invention can be applied to a site where a large water pressure acts, such as a wall surface of a basement.

FIG. 5 shows a second embodiment of the present invention, in which the water blocking member 11 is sandwiched and fixed between the inner end surface of the exterior member 12 and the flange 30 provided on the pipe 9. It is a thing. As shown in FIG. 5, the flange 30 may be integrated with the pipe 9 or may be manufactured separately from the pipe 9 and fixed later. In other respects, the structure is the same as that of the first embodiment and the operation is the same.

Even with this structure, the same effect as that of the first embodiment can be expected.

FIG. 6 shows a third embodiment of the present invention, in which the water blocking member 11 is mounted in a ring groove 40 provided on the outer peripheral portion of the exterior member 12. In other respects, the structure is the same as that of the first embodiment and the operation is the same.

Even with this structure, the same effect as that of the first embodiment can be expected, and the number of parts of the concrete mold interval holder 2 can be reduced.

In each of the above-described embodiments, the case where the water blocking member 11 is made of water-expandable hard rubber or its closed-cell foam is explained, but the elasticity of ordinary synthetic rubber or synthetic resin is used. Even if it is made of material, the expected effect can be expected.

Further, in each of the above-described embodiments, the case where the water blocking member 11 is provided in the portion of the end stopper 10 has been described, but it may be provided in the middle portion of the pipe 9 as necessary.

[0042]

[Effect of the device]

 As described above, according to the present invention, since the flange-shaped water stop member having elasticity is provided on the outer peripheral portion of the concrete form space maintaining device, the concrete form space maintaining device can be provided. Even if there is a gap between the outer peripheral surface and the concrete, the water can be completely stopped at the position of the water stop member.

Further, by providing the water blocking member to the end stopper located at the end of the concrete mold space holding tool, a sufficient water blocking effect can be obtained without hindering the mold holding work. Even if the obtained concrete wall thickness is changed, it can be dealt with simply by changing the length of the pipe.

Further, by forming at least the main part of the end stopper from ceramics, it is possible to improve the adhesion to the concrete and suppress the formation of a gap between the concrete and the end block. Since there is no thermal expansion or contraction, cracking of the concrete due to thermal deformation can be prevented. By waterproofing at least the outer end surface of the end stopper, rainwater and the like can be prevented from entering through the inside of the end stopper.

Further, the water blocking member is made of water-expandable hard rubber or its closed-cell foam, so that the water blocking member expands upon contact with water and has good adhesion to the concrete. It is possible to obtain sufficient water-stopping effect even in a portion where water pressure is applied.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a main part of a concrete form holding device according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing the overall configuration of the device shown in FIG.

FIG. 3 is an enlarged cross-sectional view showing the structure of an end stopper.

FIG. 4 is a right side view of FIG.

FIG. 5 is a view, corresponding to FIG. 3, showing a second embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 3 showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Formwork 2 Concrete formwork space maintenance tool 3 Separator 4 Connection fixing tool 5 Tightening metal fitting 6 Support material 7 Tightening washer 8 Nut 9 Pipe 10 End stopper 11 Water stop member 12 Exterior member 13 Holding member 13a Flange 14 Waterproof 16 Step 30 Flange 40 Ring groove G Gap

Claims (4)

[Scope of utility model registration request] 1. A concrete concrete mold interval holder is interposed between a pair of opposed molds, and a separator is inserted into the concrete mold interval holder. In the concrete mold holding device for connecting the molds on both sides via the concrete mold holding device, an elastic flange-shaped water stop member is provided on the outer peripheral portion of the concrete mold gap holder. -G form holding device. 2. A concrete formwork space retainer comprises a pipe and tubular end stoppers arranged at both ends of the pipe, and the water blocking member comprises at least one end stopper. The concrete form interval maintaining device according to claim 1, wherein the concrete form interval maintaining device is provided in the. 3. The concrete form spacing device according to claim 2, wherein at least a main part of the end stopper is made of ceramics, and at least an outer end surface of the end stopper is waterproofed. . 4. The water-stop member is a water-expandable hard rubber formed by compounding synthetic rubber and a highly water-absorbent resin, or a closed-cell foam formed by vulcanization molding of this water-expandable hard rubber. It is manufactured by 1.
The concrete form holding device as described in 2 or 3.