JPS64525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rubber support shoe seat for supporting an upper structure such as a bridge girder on a lower structure such as a bridge pier, and a method for installing the shoe seat on the lower structure.

Conventionally, construction of rubber bearings was carried out as shown in Figure 1.
Temporary frames A and A are assembled on the lower structure B, and filling material C such as mortar and reinforcing material D are loaded into the temporary frame A, and the shoe seat E is formed while adjusting the level thereof.
A method is used in which a rubber support S for supporting the upper structure G is placed on the shoe seat E.

However, in this method, the shoe seats E are finished by hand, so it is difficult to match the level of all of the multiple substructures B, and the smoothness of the surface on which the rubber bearing S is placed is not constant. Therefore, there is a problem that the rubber bearing S cannot fully exhibit its function.

In addition, as superstructures have become larger in recent years, the dimensions of the rubber bearing S have increased, making it difficult to adjust the level and maintain constant smoothness, making it impossible to form the shoe seat E by hand. I'm getting used to it.

In order to solve these problems, we have developed a construction method in which a rectangular precast concrete support stand made using formwork or the like is used as a footrest, and in detail, an anchor bolt is inserted into the support stand that becomes a footway. , and the support base is supported by placing nuts on the anchor bolt so as to sandwich the support base from the upper and lower surfaces, and the support base on which the anchor bolt is arranged is inserted into a recess previously provided in the lower structure through the anchor bolt. The level of the support base is adjusted by screwing the nut on the lower side of the support base attached to the anchor bolt, and after adjustment, filling material is loaded into the recess of the lower structure to fix the support base to the lower structure. Method (Unexamined Japanese Patent Publication No. 54-66526)
is proposed.

Although this method satisfies the level adjustment and smoothness of the shoe seat, there is a problem that the load acting on the rubber bearing cannot be transmitted to the lower structure over the entire surface of the shoe seat, that is, the load is not transmitted even after the shoe seat is fixed with mortar. The problem remains that the load is concentrated on the anchor bolt via the nut that adjusts the level of the shoe seat and is transmitted to the lower structure, causing damage to the lower structure due to the concentrated load.

The present invention has been made in view of the above, and by manufacturing the shoe seat separately and screwing the adjustment bolt onto a female screw piece made of a soft or elastic material, the construction and level adjustment of the shoe seat can be easily performed. At the same time, the load acting on the shoe seat via the rubber bearing is transmitted to the lower structure without acting as a locally concentrated load.

That is, a recess is provided on a lower structure such as a bridge pier, and the upper surface on which the rubber bearing is placed in the recess is formed to be smooth, and the lower surface is formed in a tapered shape that increases in thickness from the ends toward the center. A plurality of female threaded pieces made of an elastic material or soft material are embedded and fixed in the end edge thereof, and adjustment bolts are screwed into the female threaded pieces with their upper and lower ends protruding from the female threaded pieces respectively. A rubber support shoe seat is placed with its lower surface facing the recess, and one end of the adjustment bolt protruding from the lower surface is placed in contact with the bottom surface of the recess.

Next, the level of the shoe seat is adjusted by rotating the adjustment bolt in either direction with the other end protruding from the top side of the shoe seat, and after the adjustment, the side and bottom surfaces of the shoe seat and the recess in the lower structure are adjusted. A shoe for a rubber bearing in which the load acting on the base body via the rubber bearing does not act on the adjustment bolt due to elastic or plastic deformation of the female screw piece by fixing the shoe seat by loading a filler between the shoes. The present invention provides a seat and a method for installing the shoe seat on a lower structure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes a shoe seat having a smooth upper surface 2 on which a rubber support S is placed. The shoe seat 1 is made of precast concrete on which reinforcing members 3, 3 are arranged, and is formed by a formwork.

Reference numeral 4 denotes the lower surface of the shoe seat 1, and the lower surface 4 is tapered so that the thickness increases from the ends toward the center so that a filling material 9, which will be described later, can be easily loaded during fixation.

Reference numerals 5 and 5 designate a plurality of female screw pieces that are integrally embedded in the edge of the shoe seat 1, and the female screw pieces 5 are made of an elastic material such as a plastic material such as hard rubber or a soft material such as a soft metal such as aluminum. It is made of material.

Reference numeral 6 denotes a threaded portion of the female threaded piece 5, and 7 is an adjustment bolt screwed onto the threaded portion 6. The upper and lower ends of the adjustment bolt 7 are made to protrude from the female threaded piece 5, respectively.

Next, a method for installing the shoe seat 1 having the above-described structure on the lower structure will be described in detail.

That is, the shoe seat 1 has a lower surface 4 of the shoe seat facing the recess 8 provided in advance on the lower structure B such as a bridge pier, and a female screw piece 5.
An adjustment bolt 7 that is screwed onto and protrudes from the lower surface 4 side.
is placed so that one end thereof is in contact with the bottom surface of the recess 8.

Next, the level of the shoe seat 1 is the so-called shoe seat upper surface 2.
The level of the shoe seat 1 is adjusted by rotating the adjustment bolt 7 in either direction with the other end protruding from the upper surface 2 side of the adjustment bolt 7, and after the adjustment, the level of the shoe seat 1 is adjusted. It is installed by fixing the shoe seat 1 to the lower structure B by filling a filling material 9 such as mortar between the side and lower surfaces 4 and the recess 8 of the lower structure.

In addition, when placing the rubber support S on the shoe seat 1, place it on the shoe seat upper surface 2 in advance before installing the shoe seat 1 on the lower structure B, and in this state, place the shoe seat 1 on the shoe seat 1 on the lower structure B.
Alternatively, the shoe seat 1 may be installed on the lower structure B and then placed on the upper surface 2 thereof.

By configuring the shoe seat 1 in this way and adopting the installation method described above, the construction and level adjustment of the shoe seat 1 on which the rubber bearing S is placed can be easily performed, and the shoe seat 1 can be operated through the rubber support S. The load can be transmitted to the lower structure B through the entire lower surface 4 of the shoe seat without concentrating it on the adjustment bolt 7. In other words, the adjustment bolt 7 is screwed onto a female threaded piece 5 made of an elastic or soft material. Therefore, even if a load is applied to the shoe seat 1 via the rubber bearing S, the load will be absorbed by the threaded portion 6 of the female threaded piece screwed into the adjustment bolt 7.
When the load deforms elastically or plastically, the load is not transmitted to the adjustment bolt 7, but is directly transmitted from the shoe seat 1 to the lower structure B, thereby preventing damage to the lower structure B due to concentrated loads. .

Here, to explain the female screw piece 5 in detail, the female screw piece 5 is rigidly screwed together with the adjustment bolt 7 to absorb the weight of the shoe seat 1 under construction or the shoe seat 1 on which the rubber bearing S is placed. However, when a load above a certain level is applied after the shoe seat 1 is fixed to the lower structure B, that is, the own weight of the upper structure and a load acting on the upper structure, the threaded portion 6 has an elastic or threaded surface. It is formed so as to be plastically deformed, thereby producing the above-mentioned effect.

In this embodiment, the shoe seat 1 is formed of precast concrete that can be mass-produced with a certain quality using a formwork, but it may also be formed of other materials such as metal materials such as cast steel. It is.

The present invention has the above-mentioned configuration, and by using a separately manufactured shoe seat with a simple structure, construction of the shoe seat and adjustment of the level can be easily performed, and the load acting on the shoe seat via the rubber bearing can be easily applied. Compared to the intensive transmission to the lower structure seen in shoe seats using conventional adjustment bolts, the transmission is transmitted through the shoe seats by screwing the adjustment bolt into a female threaded piece made of soft or elastic material. Since the transmission is possible, it has great effects such as being able to prevent damage to the lower structure.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing a conventional method of forming a shoe seat for a rubber support, and FIG. 2 is a partial vertical cross-section showing a shoe seat for a rubber support of the present invention and a method of installing the shoe seat in a lower structure. FIG. 3 is a perspective view showing a shoe seat for a rubber support according to the present invention. 1: Shoe seat, 2: Top surface, 4: Bottom surface, 5: Female thread piece, 6: Thread part, 7: Adjustment bolt, 8: Recessed part,
9: Filler.

Claims (1)

[Scope of Claims] 1. A shoe seat for a rubber bearing, which has a smooth upper surface on which the rubber bearing is placed, and a tapered lower surface whose thickness increases from the ends toward the center,
A plurality of female screw pieces made of an elastic material or a soft material are embedded and fixed to the end edge.
A shoe seat for a rubber bearing, characterized in that adjustment bolts are screwed onto the female threaded piece, with the upper and lower ends thereof respectively protruding from the female threaded piece. 2. A rubber support shoe seat is placed in a recess provided on a lower structure such as a bridge pier with its lower surface facing the recess, and one end of the adjustment bolt protruding toward the lower surface is placed in contact with the bottom of the recess, Next, the level of the shoe seat is adjusted by rotating the adjustment bolt in either direction with the other end protruding toward the top side, and after the adjustment, a filler is loaded between the side and bottom surfaces of the shoe seat and the recessed portion of the lower structure. By fixing the shoe seat with the rubber bearing, the load acting on the shoe seat via the rubber bearing is prevented from acting on the adjustment bolt due to elastic or plastic deformation of the female screw piece. How to install.