JPH0320543B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an expansion joint member used for an expansion joint of a concrete slab, which has a shape and function that particularly follows the movement of the concrete slab, and which allows the joint member itself to retain its flexibility. The present invention relates to joint members.

The present invention also relates to a construction method for such an expansion joint member.

Conventional joint members of this type for expansion and contraction buffering used in concrete slabs rarely have the function of adhering to concrete, and when the concrete slab contracts, the joint member and the concrete slab do not come into close contact with each other, so a gap opens and dirt and sand can form. It had the disadvantage that it would no longer function as an elastic cushioning material the following year, such as inflow of water and flower seeds, which would germinate and grow, causing grass to grow on the roof.

In addition, although molded joint members have been widely used in recent years, most of them are made of hard synthetic resin moldings, so many of them are unsuitable as expansion joint members because the joint members are damaged by compressive stress when the concrete slab expands. .

In addition, joint members using vulcanized rubber molding material alone have the disadvantage that they are soft and bend due to the inflow pressure during concrete placement, making it impossible to install straight joints. It does not have the following.

The present invention aims to eliminate such drawbacks, provide an expandable joint member that has a shape and function that follows the movement of a concrete slab, and allows the joint member itself to maintain its flexibility, and a construction method thereof. It is something.

The present invention provides an expansion joint member having a rigid synthetic resin support having a two-legged pedestal shape in cross section and having a desired width, height, and length as a skeletal core material. At least one anchor anchored to the concrete frame having a substantially same shape and facing outwardly in contact with the outside of the upper part of the support.
A flexible vulcanized rubber molded strip having individual protrusions is coated from the outside, and a layer of a non-vulcanized rubber adhesive composition is disposed over both outer surfaces of the molded strip. At least one hook is formed near the lower end of each of the lower legs of the support body to be anchored to the concrete frame facing outward, and at the same time, a beam-shaped synthetic resin having a substantially square cross section provides expansion and contraction cushioning on the inner side of both legs. To provide an expansion joint member, characterized in that it is made up of a foam that is inserted and clamped so that the vulcanized rubber molded strip can deform following the behavior of the concrete body.

That is, the configuration of the present invention is that the vulcanized rubber molded strip 5
A non-vulcanized rubber-based adhesive composition layer 6, 6' that has the property of adhering to the concrete when the fresh concrete is cured and cured is disposed on both sides of the concrete 3, 3'. By having anchoring protrusions 4, 4' and hooks 8, 8', it can be securely fixed to the concrete slabs 3, 3'.

Since the vulcanized rubber molded strip 5 has flexible elasticity, it has the property of sufficiently following the expansion and contraction of the concrete slabs 3 and 3', but it also has the ability to maintain straightness and horizontality as a joint member used alone. In order to compensate for this drawback, a relatively hard synthetic resin support 1, that is, a skeletal core material, is used inside. This support body 1 is covered from the outside with a vulcanized rubber molded strip 5 of approximately the same shape, and has hooks 8, 8' embedded in the concrete and fixedly anchored at the tips of the legs 7, 7'. The support 1 has a space 2 that facilitates deformation when it is pressed by concrete.

The joint member of the present invention is a composite of the above upper structure and a synthetic resin foam 9 in the lower part.

The present invention provides an expansion joint member having a rigid synthetic resin support having a two-legged pedestal shape in cross section and having a desired width, height, and length as a skeletal core material. and coated from the outside with a flexible vulcanized rubber molded strip having at least one protrusion in contact with the outside of the upper part of the support and having at least one protrusion anchored to the concrete frame, each facing outward; A layer of a non-vulcanized rubber adhesive composition is disposed over both outer surfaces of the externally formed strip, and at least one anchor is anchored to the concrete frame facing outward near the lower end of both legs at the bottom of the support. When constructing an expansion joint member on a concrete slab, the expansion joint member is formed by forming each hook and inserting and sandwiching a beam-shaped synthetic resin foam body with an approximately square cross section for expansion and contraction cushioning on the inside of both legs. After fixing the hooks near the lower ends of both legs of the synthetic resin support with temporary fixing mortar, a concrete slab is installed and anchored, and the protrusions at the lower ends of the flexible vulcanized rubber molded strips are fixed to the concrete. The unvulcanized rubber-based adhesive compound layer closely adheres to the concrete and follows the concrete when the concrete hardens and cures, thereby controlling the behavior of the concrete slab. The present invention provides a construction method for an expansion joint member in which the vulcanized rubber molded strip is constructed in such a manner that it can follow and deform.

In other words, the joint member of the present invention is concrete 3,
3', the protrusions 4, 4' of the flexible vulcanized rubber molded strip 5 are embedded in the concrete and anchored, and the non-vulcanized rubber adhesive composition layers 6, 6 are installed in the concrete. ' is characterized in that it completely adheres to the concrete interface at the time of completion of hardening of the fresh concrete.

To describe a more specific construction method, the joint member of the present invention is temporarily installed along the joining line on which the joint member is installed on the base on which the concrete slabs 3 and 3' are installed, and the water line is Using hard-kneaded mortar to align the tips of the joint members to the level of Install and fix the joint members. At this time, the joint member can be easily and reliably installed due to the presence of the support 1 serving as the core material, in which the level adjustment of the joint member can be performed linearly and along the water line.

Next, after removing the release papers 10 and 10' that had been applied to both sides of the non-vulcanized rubber adhesive composition layers 6 and 6',
After pouring the concrete, trowel it while leveling the top surface of the concrete by tapping it well. At this time, the joint member does not curve due to the concrete inflow pressure because of the presence of the core support.

Next, after the concrete slabs 3, 3' are completely cured, the curing tape 11 covering the upper surface of the vulcanized rubber molded strip 5 is removed to form a joint member.

Describing the effects of the present invention as follows, when the joint member of the present invention is used to construct an expansion joint for concrete, since it has a skeletal core material of a relatively hard synthetic resin support, it can easily be used in vertical and horizontal directions. The joints were installed in a straight line, and the joints were installed along the water slope without any variation in the upper and lower horizontal levels. After observing the situation after installing the joint member of the present invention for one year, we found that when the concrete slab expands and the joint member is compressed in the summer, as shown in Figure 4A, the upper vulcanized rubber molding strip The material rose to the top and was deformed, but was not damaged. Furthermore, as shown in Figure 4C, when the concrete slab shrinks in winter, the non-vulcanized rubber adhesive composition layer is Since the concrete slab was in close contact with the joint material, there was no gap between the concrete slab and the joint material when it was stretched as it was. Therefore, the inflow of earth and sand and the intrusion of water were prevented, and no damage to the joint members due to freezing and expansion of water at night was observed.

The structural effects of the expansion joint member of the present invention are summarized as follows.

(1) As already mentioned in the present invention, the hard resin support 1 having the buffer space 2 inward is fitted above the beam-shaped synthetic resin foam 9, and the lower end is attached to the side thereof. Concrete hardening and curing is completed because it has a double support structure in which a flexible and elastic vulcanized rubber molded strip 5 having protrusions 4 is covered and a non-vulcanized rubber adhesive composition is provided over its outer surface. At the point in time, the non-vulcanized rubber adhesive composition 6 was applied to the concrete plate 3
In winter and summer, Fig. 4 A~
As shown in C, it can follow the contraction and expansion of the concrete slab 3, and also follows the tension well, and since there is no gap between the concrete slab and the joint material, it is possible to prevent the inflow of earth and sand and the intrusion of water. This has the effect of preventing joint members from being damaged due to freezing and expansion of water at night.

(2) A hard synthetic resin support 1 is placed above the synthetic resin foam 9 that will serve as a joint material during construction of the present invention,
Since a soft vulcanized rubber molded strip 5 is fitted and a non-vulcanized rubber adhesive composition layer 6 is further applied on the outside thereof, temporary fixation is performed in the first step as shown in FIG. When the mortar 3A is cast and the temporary fixing mortar hardens, the hook 8 at the tip of the foot 7 hanging below the support 1 is used to anchor the support 1, thereby fixing the position of the support 1. Next, add regular concrete to support 1
When the hardened protrusion 4 is cast close to the upper end surface, the hardened protrusion 4 is fixed as an anchor, and the soft vulcanized rubber molded strip 5 is fixed by the anchor effect. In addition, since the non-vulcanized rubber adhesive composition layer has a bonding force with the soft rubber molded strip 5, even if the concrete slab expands or contracts, the soft vulcanized rubber molded strip 5 follows the support. 1 damage can be prevented.

As explained above, the joint member of the present invention and its construction method are extremely effective and useful as an expandable joint member for concrete slabs, and the construction is simple and reliable.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the expansion joint member of the present invention, Fig. 2 is a perspective view showing the completed construction state of the expansion joint member of the embodiment of the invention, and Fig. 3 is a concrete A perspective view showing the state after installation, and FIGS. 4A, B, and C are sectional views for explaining the state around the expansion joint member after construction, respectively. 1... Hard synthetic resin support, 2... Space,
3,3'...Concrete frame, 4,4'...Protrusion, 5...Vulcanized rubber molded strip, 6,6'...Non-vulcanized rubber adhesive composition layer, 7,7'...Support Both legs of body 1, 8, 8'... hook, 9... synthetic resin foam,
10, 10'... Release paper, 11... Curing tape.

Claims (1)

[Scope of Claims] 1. In an expansion joint member whose skeletal core is a hard synthetic resin support with a two-legged pedestal-like cross section and a desired width, height, and length, the inner side of the upper part of the support A flexible vulcanized rubber molded strip is provided on the outside with a space and at least one protrusion that is approximately the same shape and has at least one protrusion that anchors the concrete structure facing outwardly, in contact with the outside of the upper part of the support. A layer of a non-vulcanized rubber adhesive composition is provided over both outer surfaces of the formed strip, while a layer of concrete directed outward is provided near the lower end of both legs at the bottom of the support. At least one hook is formed for anchoring the concrete frame, and a beam-shaped synthetic resin foam body with a substantially square cross section for buffering expansion and contraction is fitted and held inside each of the legs, thereby controlling the behavior of the concrete frame. An expandable joint member characterized in that the vulcanized rubber molded strip is configured to be deformable following the movement of the vulcanized rubber molded strip. 2. In an expansion joint member whose skeletal core is a hard synthetic resin support with a two-legged pedestal type cross section and a desired width, height, and length, a space is provided inside the upper part of the support. and a flexible vulcanized rubber molded strip having at least one protrusion that is substantially identical to the outside of the upper part of the support and anchors to the concrete frame facing outward, and A layer of a non-vulcanized rubber adhesive composition is disposed on both outer surfaces of the formed strip, while at least one anchor is anchored to the concrete frame facing outward near the lower end of both legs at the bottom of the support. When constructing an expansion joint member on a concrete slab, the expansion joint member is formed by forming individual hooks and inserting and sandwiching a beam-shaped synthetic resin foam body with an approximately square cross section that cushions expansion and contraction on the inside of both legs. After fixing the hooks near the lower ends of both legs of the resin support with temporary fixing mortar, a concrete slab is installed and anchored, and the protrusions at the lower ends of the flexible vulcanized rubber molded strips are fixed in the concrete. The non-vulcanized rubber adhesive composition layer closely adheres to the concrete and follows the concrete when the concrete hardens and cures, thereby controlling the behavior of the concrete slab. A construction method for expansion joint members that allows the vulcanized rubber molded strip to follow and deform.