JPS5839963B2 - bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support used for bridges such as railways and highways, and particularly to a support that is easy to install and used for bridges whose substructures such as piers are made of concrete.

Conventionally, the supports used for these bridges include a lower shoe 1 that is fixed to a lower structure B such as a pier, and an upper shoe that is fixed to a superstructure G such as a bridge girder, as shown in Figures 1 and 2. 2
and a movable member (not shown) disposed between the upper and lower shoes 1 and 2 to support the upper structure G and to release the displacement of the upper structure G due to expansion and contraction due to temperature changes and deflection due to vehicle traffic. has been done.

Here, as a method to release the displacement of the upper structure G, there are a method by sliding the upper shoe 2 or the lower shoe 1 or the upper and lower shoes 1, 2 and the movable member, a method by rolling, or a method by rocking. Depending on the form of the movable member, the bearing may be a "sliding bearing (or a bearing plate bearing)".
”, “rolling bearings (or roller bearings)”, and “bottle bearings/pivot bearings”.

In any of the bearings, the lower shoe 1 has ribs 4, 4 on the lower surface 3 located on the side of the lower structure B, and through-holes on the periphery of which are inserted anchor bolts 5, 5 embedded and fixed in the lower structure B. 6, 6 are respectively provided, and furthermore, a box-opening recess 7 in which the ribs 4, 4 of the lower shoe can be buried is formed in the lower structure B.

To install the support on the lower structure B, the through hole 6 of the lower shoe is placed in the lower structure B so that the rib 4 of the lower shoe is located in the boxed recess 7 on the lower structure B. It is placed by fitting it into the anchor bolt 5 which has been fixed in advance.

Then, if the bearings are simply placed in the box-cut recesses 7 and fixed, the heights and vertical positions of the bearings placed on the plurality of lower structures B will be uneven, and the upper structure G where vehicles come and go will become uneven.
Because of this problem, a thin plate-shaped liner 8 is stacked between the lower surface 3 of the lower shoe and the box-opening recess 7 to adjust the height of the support.

Thereafter, a method is adopted in which the box-opening recess 7 is filled with mortar 9 and a nut is screwed onto the anchor bolt 5 to fix it, thereby installing it in the lower structure B.

By installing it in this way, the vertical upward force acting on the bearing is regulated by the pulling force of the anchor bolt 5, and the horizontal force is regulated by the engagement of the mortar 9 and the rib 4, so that the upper structure G is It is supported.

However, in this installation method, since the gap between the lower surface 3 of the lower shoe and the box-opening recess 7 of the lower structure is small, the entire lower surface 3 of the lower shoe is not completely filled with mortar 9, which tends to result in insufficient fixation of the support. If the engagement between the rib 4 and the mortar 9 is incomplete, there will be a gap in the radial direction between the anchor bolt 5 and the through hole 6 of the lower shoe to facilitate installation.
The lower shoe 1 is displaced in the horizontal direction by an amount corresponding to the gap, resulting in problems such as deformation of the anchor bolt 5 and even cracking of the bearing seat.

In addition, since the liner 8 whose height has been adjusted is buried as is, the load acting on the upper structure G acts as a concentrated load on the liner 8 portion, causing damage to the lower structure B and the support, especially the lower shoe 1. There are problems such as easily inviting

In order to avoid such problems, maintenance management is complicated, and if a problem occurs, passing vehicles must be stopped to replace the bearing or repair the substructure B. It is something to leave behind.

The present invention has been made to solve these problems.

In other words, a support consisting of an upper shoe that is fixed to an upper structure such as a bridge girder, a lower shoe that is fixed to a lower structure such as a bridge pier, and a movable member that is arranged between the upper and lower structures and allows displacement of the superstructure. In the lower shoe, a plurality of through holes are formed on the periphery thereof, and one end surrounds the through hole and is in contact with or fixed to the lower surface, and the other end is in contact with or fixed to the seat plate. A reinforcing concrete block is integrated with the lower shoe, and includes a through-hole and an anchor bolt that is inserted through the through-hole and the cannula, and has one end screwed into the nut at the end of the through-hole and the other end screwed into the seat plate. This provides a support characterized by the fact that it is formed in

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

10 is a lower shoe 11 fixed to the lower structure B; an upper shoe 11 is fixed to the upper structure G disposed on the lower shoe 10 via a movable member (not shown); 11 and the movable member constitute a support S.

12. 12 is a rib formed on the lower surface 13 of the lower shoe; 14.
14 is a through hole formed at the peripheral edge of the lower surface 13;
Reference numeral 5 designates an anchor bolt, and the anchor bolt 15.15 has threaded portions 16 and 16' formed at both ends thereof, and the threaded portion 16 is provided with a jig insertion hole 17.

The anchor bolt 15 has a threaded portion 16 at one end inserted into the through holes 1 and 4 of the lower shoe so that the jig insertion hole 17 protrudes from the upper surface of the lower shoe 10, and a threaded portion 16' at the other end. The seat plate 19 having the threaded portion 18 is screwed into the threaded portion 18 of the seat plate 19 so that the end thereof slightly protrudes.

Reference numeral 20 denotes a cannula that is covered with the anchor bolt 15, and the cannula 20 is connected to the anchor bolt 1 between the lower surface 13 of the lower shoe and the seat plate 19.
5 from adhesion of concrete.

Reference numeral 21 denotes a reinforced concrete block formed integrally with the lower shoe 10 on the lower surface 13 of the lower shoe, and the reinforced concrete block 21 includes the above-mentioned rib 12, the cannula 20, and the anchor bolt 15 inserted into the cannula 20. The anchor bolt 15
It is formed so as to enclose a seat plate 19 screwed onto one end of the seat plate 19 .

The reinforced concrete block 21 can also have a concrete structure with a reinforcing material or a prestressed concrete structure.

22. 22 is a nut screwed onto the threaded portion 16 of the anchor bolt protruding from the upper surface of the lower shoe 10. The nut 22 is attached to the lower shoe 10 by tightening the reinforcing concrete block 21 after the support S is installed. This is to restrict the vertically upward force acting on S.

Reference numeral 23 denotes a box-opening recess provided in the lower structure B in which the reinforced concrete block 21 is buried, and the box-opening recess 23 is provided with at least a gap between the reinforcing concrete block 21 and its side wall at a predetermined position where the support S is arranged. formed to the desired size.

24 is a box recess 23 and a reinforced concrete block 21
This is mortar filled in the gap between the

In addition, reinforced concrete blocks 21 are installed on the lower surface 13 of the lower shoe.
In order to integrally form the lower shoe 10, for example, place it vertically on the support Z, and then attach the seat plate 19 to the threaded portion 16' at one end.
The anchor bolt 15, which has been screwed on, is inserted into the cannula 20 so that one end of the cannula 20 contacts the seat plate 19, and the threaded part 16 of the other end of the anchor bolt 15 is inserted onto the lower surface 13 of the lower shoe. It is inserted into the through hole 14 of the lower shoe, and the other end of the cannula 20 is placed in contact with the lower surface 13 so as to surround the through hole 14.

After that, the formwork Y is arranged on the support Z, and the mantle 20 and the anchor bolt 15 inserted through the mantle 20 are
is held in an appropriate means, such as a formwork Y, so that it does not move, and reinforcing materials such as reinforcing bars (not shown) are placed as necessary, and then concrete is placed in the formwork Y so that the end surface is the seat plate 19. A reinforced concrete block 21 containing the rib 12 of the lower shoe, the mantle 20, the seat plate 19, and the anchor bolt 15 is created by filling it in the same manner as shown in FIG.
is formed integrally with the lower shoe 10.

In addition, in the method of forming the reinforced concrete block 21 shown in FIG. 4, the cannula 20 is brought into contact with the seat plate 19 and the lower surface 13 of the lower shoe, and one end is screwed into the seat plate 19 to maintain its position during filling with concrete. The attached anchor bolt 13 and cannula 20 were held in a formwork Y or the like as appropriate.
3, and the other end is fixed to the seat plate 19 so as to surround the threaded portion 18 of the seat plate 19, thereby eliminating the need for a means to hold these in a predetermined position during concrete filling, and making it possible to fix the anchor bolts 15 to the seat plate 19 from the beginning. It is also possible to form a reinforcing concrete block 21 on the lower surface of the lower shoe without placing it from above, and then insert the cannula 20 through the through hole 14 of the lower shoe and screw it onto the seat plate 19.

With this configuration, it is possible to obtain a reinforced concrete block 21 that is integrated with the lower shoe 10 on the lower surface 13 of the lower shoe and whose lower surface 13 is densely filled with concrete. Since the integration can be carried out at a factory, products of desired quality can be easily obtained.

Next, a method for installing the support S on the lower structure B will be described.

Anchor bolts 15 are inserted into the support S, on which a reinforced concrete block 21 is formed on the lower surface 13 of the lower shoe, into the box-opening recess 23 of the lower structure that was previously provided during concrete pouring.
The screw portion 1C end of the iron box is arranged so as to come into contact with the bottom surface of the iron box recess 23.

Next, to adjust the height and vertical position of the support S, insert a jig (not shown) into the jig insertion hole 17 provided in the threaded portion 16 of the anchor bolt 15 insulated by the cannula 20. This is done by placing and rotating it.

After that, the reinforced concrete block 21 is buried and fixed in the lower structure B by filling the gap between the boxed recess 23 and the reinforced concrete block 21 with mortar 24, and then the threaded part 16 of the anchor bolt is attached to the vertical direction that acts on the support S. Installation is completed by screwing in a nut 22 that regulates upward force to tightly connect the lower shoe 10 and the reinforced concrete block 21.

In addition, in this installation method, the anchor bolt 15 is placed in the mortar 2 with one end in contact with the bottom of the box recess 23.
However, in order to prevent the load acting on the upper structure G after installation from acting as a concentrated load on the lower structure B via the anchor bolts 15, after the mortar 24 hardens, the anchor bolts 15 are slightly moved upward. It is preferable to rotate the anchor bolt 15 and return it by a certain amount so that the anchor bolt 15 does not come into contact with the bottom surface of the box-opening recess 23.

The present invention has the above-mentioned structure, and by integrally forming a reinforced concrete block containing anchor bolts on the lower surface of the lower shoe, the mortar is filled around the reinforced concrete block, which is better than the conventional method. It can be filled easily and reliably, and the support and substructure are securely fixed.

In addition, by adjusting the position of the bearing using anchor bolts and pulling the anchor bolts upward after the mortar has hardened, installation and adjustment to the substructure can be performed more reliably than when conventional liners are used. In addition, since it is possible to prevent the action of concentrated loads after fixing, it is possible to prevent damage to the bearing seat and the bearing.

Furthermore, since the reinforced concrete block can be integrated with the lower shoe at the factory, it has great effects such as superior maintenance management and workability.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional support, Fig. 2 is a plan view showing the lower surface of the lower shoe constituting the conventional support, Fig. 3 is a side view showing the support of the present invention, Fig. 4 FIG. 2 is an explanatory diagram showing a method of integrating the lower shoe, which is a main part of the support of the present invention, with a reinforcing concrete block. 10; lower shoe, 13; lower surface, 14; through hole, 15; anchor bolt, 19: seat plate, 20; mantle, 21; reinforced concrete block.

Claims (1)

[Claims] 1. An upper shoe fixed to an upper structure such as a bridge girder, a lower shoe fixed to a lower structure such as a bridge pier, and a shoe placed between the upper and lower structures,
In a support consisting of a movable member that allows displacement of the upper structure, a plurality of through holes are formed in the peripheral edge of the lower shoe, and one end of the lower shoe surrounds the through holes and contacts the lower surface. An anchor bolt that is inserted into a through hole and the cannula, has one end screwed into a nut at the end of the through hole, and the other end screwed into the seat plate. A bearing characterized in that a reinforcing concrete block is integrally formed with the lower shoe.