JPS6116825B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an expansion joint member used for an expansion joint of a concrete slab, and in particular has a shape and function that follows the behavior of the concrete slab, and the installation work of the expansion joint member is simple and linear. This relates to expansion joint members that are beautifully finished. Conventional joint members of this type do not adhere to fresh concrete, and even if they are made of a material that adheres to fresh concrete, the material is thin.
The drawback was that the sealing effect could not be expected due to fatigue caused by repeated expansion and contraction. Furthermore, in cold regions, water that has entered the gap between the expansion joint member and the concrete slab freezes, which has an adverse effect on the concrete slab. In addition, during the summer, expansion joint members are compressed due to the expansion of the concrete slab as the temperature rises, and if this type of expansion joint member is configured with hard synthetic resin molded parts on both sides, the concrete slab will be compressed. There were drawbacks such as scale-like damage to the surface layer and bending of the expansion joint member itself.
In addition, if the upper part of the expansion joint member is made of a hard synthetic resin molded product, the recovery ability is low, and even when the joint width is narrower than that at the time of installation of the expansion joint member, the gap between the concrete slab and the expansion joint member The problem was that there were gaps between the two. Furthermore, expansion joint members with a structure that improves the above-mentioned drawbacks and are easily deformed suffer from workability and aesthetics due to load deformation and thermal deformation due to sunlight irradiation during inventory and at the construction site, resulting in difficulty in achieving straightness. There were drawbacks in this respect. That is, as mentioned above, conventional products of expansion joint members have the common drawback of lack of sealing effect in terms of ability to follow concrete expansion and contraction behavior, and drawbacks of workability and aesthetics. The present invention eliminates these drawbacks, and
The purpose of the present invention is to provide an expansion joint member that has a shape and function that follows the behavior of a concrete slab, is easy to install, and can be beautifully finished linearly. In the present invention, an expansion joint member disposed between concrete slabs comprises a synthetic resin foam, a hard synthetic resin support having a desired length that covers the upper surface of the foam, and a support suspended from both sides of the support. The support is composed of a leg having a hook portion at the tip, a soft synthetic resin cover provided to cover the upper surface and both side ends of the support, and an adhesive plastic layer provided on both sides of the leg of the support. The expansion joint member is characterized in that a cushioning space is provided between the body and the foam body. That is, the expansion joint member of the present invention has the following configuration. 1 Flat plate-like upper part 1a of hard synthetic resin support 1
A soft synthetic resin cover 2 is integrally provided to cover the upper surface and both side portions 1b, 1b. 2. Butyl rubber adhesive plastic layers 4, 4 are provided on both sides of both outer legs 3, 3 of the support 1. 3 Fit the synthetic resin foam 8 between the legs 3 and 3 on both sides below the support 1, and abut against the support protrusion 7 of the support 1, and also fit the foam 8 between the support 1 and the foam 8. A buffer space 9 is provided. 4 Furthermore, at least one hook 6, 6 for anchoring to concrete is provided near the tips of the legs 3, 3 on both sides of the support body 1, respectively. Next, in the hard synthetic resin support 1 used in the present invention, the support protrusion 7 of the synthetic resin foam 8, the legs 3, 3 on both sides, the flat upper part 1a of the concrete anchor hook 6, The materials of both side parts 1b, 1b of this upper part 1a are all made of hard vinyl chloride resin, ABS resin, low pressure polyethylene, polypropylene, nylon, polyester resin, etc. alone or in combination. Soft synthetic resin cover 2
The material used is soft vinyl chloride resin, high-pressure polyethylene, EVA, rubber, etc. alone or in combination. The butyl rubber-based adhesive plastic layers 4, 4 are adhesive compositions that are easily plastically deformed and are made of basic polymers such as butyl rubber, polyisobutylene, recycled butyl, etc., used alone or in combination. The material of the synthetic resin foam 8 is polyethylene, polystyrene, polyurethane, or the like. Since the present invention has the above configuration, it has been able to bring about the following effects. That is, for the butyl rubber adhesive plastic layers 4, 4, it is preferable to use a recycled butyl rubber adhesive plastic material that has the characteristic of adhering to fresh concrete, which follows the behavior of the concrete slab and provides very good results against repeated expansion and contraction. can get. Since the cover 2 made of soft synthetic resin and the buffer space 9 are provided, it can sufficiently withstand compression, prevent scale-like destruction of the concrete surface layer, and improve recovery performance. The hard synthetic resin support 1 is characterized by a structure that prevents load deformation and thermal deformation and easily ensures straightness, so that the installation work is easy and the appearance after completion of concrete construction is beautiful. Since the hooks 6, 6 are provided for anchoring to the concrete slab 5, it is possible to prevent the expansion joint member of the present invention from protruding above the surface of the concrete slab 5 due to the behavior of the concrete frame 5. As explained above, the expansion joint member of the present invention is
The combination, shape, and structure of hard synthetic resin, soft synthetic resin, and butyl rubber-based adhesive plastic are extremely effective and new, and by being integrated with the concrete slab 5, it exhibits reliable waterproofing and water-stopping effects for a long period of time. However, the handling workability has been improved. Next, the procedure for actually using and constructing the expansion joint member of the present invention will be briefly explained. (1) String water string at the specified height at the location where the expansion joint member will be installed. (2) Install the expansion joint members following the water line. (3) Make an earthen embankment of cement mortar up to the bottom of the concrete slab anchor hook 6 and secure it firmly. (4) Remove the protective tape from the butyl rubber adhesive plastic layers 4, 4. (5) Place fresh concrete. (6) Remove the protective tape (not shown) on the top surface of the soft synthetic resin cover 2 of the expansion joint member and complete. Next, one embodiment of the present invention will be described with reference to FIG. The expansion joint member of the present invention is installed in the center of the wooden frame,
Fresh mortar 5 is cast on both sides, hardened and cured, and used as a test sample. As shown in Figure 4, the test sample is placed on the test jig 11 using epoxy adhesive 1.
After completion of pasting and curing at 0, an expansion/contraction repetition test was conducted 1000 times at an expansion/contraction rate of 10 mm/min and expansion/contraction ratios of ±5%, ±10%, and ±20% of the joint width.
In addition, the compression test was performed at a compression speed of 10 mm/min and a compression distance of 3.
The test was conducted as mm. Compression recovery property was measured by compressing at a compression rate of 10 mm/min for 3 minutes at the point of 3 mm compression, and 60 minutes after releasing the compressive stress. The results are summarized in Table 1 together with comparative examples.

[Table] As shown in Table 1, the expansion joint member of the present invention showed a significant difference from conventional products (Comparative Examples 1 to 3) in the expansion/contraction cyclic test, compression recovery property, and compression test. Since a buffer space 9 is provided between the synthetic resin foam 8 and the hard synthetic resin support 1 covering the upper part of the foam 8, the expansion and contraction of the concrete slab 5 is minimized. This provides a great engineering effect without creating a joint gap between the concrete frame and the hard synthetic resin support 1. Further, in the present invention, the hard synthetic resin support 1
Since the upper surface is covered with the cover 2 made of hard synthetic resin, the aesthetic appearance is not spoiled due to damage to the surface, and since the adhesive plastic layer 4 is provided on both sides of the legs of the hard synthetic resin support 1, the support 1 In addition to improving the adhesion between the concrete frame and the concrete frame, it can also serve as a reinforcing member on both sides of the legs. In addition, when the length of the support 1 is large, it is effective to provide support legs 7 and abut against the synthetic resin foam 8 serving as the joint material, which provides sufficient support for the support 1 and maintains its flatness. It is. Note that when the support body 1 and the leg portions 3 are made thicker and more rigid, the support legs 7 can be omitted.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the expansion joint member of the present invention, FIG. 2 is a cross-sectional view of the expansion joint member shown in FIG. 1, and FIG. It is a sectional view showing a completed state of construction of the member.
FIG. 4 is an explanatory diagram of a repeated expansion and contraction test of the expansion joint member according to the present invention. DESCRIPTION OF SYMBOLS 1... Hard synthetic resin support, 1a... Flat upper part of support 1, 1b... Both sides of flat upper part of support 1, 2... Soft synthetic resin cover, 3, 3
... Both legs of the support 1, 4... Butyl rubber adhesive plastic layer, 5... Concrete frame, 6... Concrete plate anchor hook, 7... Synthetic resin foam 8
Support protrusion, 8...Synthetic resin foam, 9...Buffer space, 10...Epoxy resin adhesive, 11
...Test jig.

Claims (1)

[Claims] 1. The expansion joint member installed between the five concrete slabs consists of a synthetic resin foam 8, a hard synthetic resin support 1 having a desired length that covers the upper surface, and a support 1 that is suspended from both sides of the support. A leg support 3 having a hook 6 at the tip, a soft synthetic resin cover 2 provided to cover the upper surface and both side ends of the support 1, and a butyl rubber adhesive plastic material provided on both sides of the leg of the support. It consists of a body layer 4, the support body 1 and the foam body 8.
An expansion joint member characterized in that a buffer space 9 is provided between.