JPH08333702A - Supporting structure of beam and bearing method thereof - Google Patents

Abstract

PURPOSE: To enable it to prevent a beam from being formed into a state of three-point supports as well as to aim at the promotion of inexpensiveness in cost. CONSTITUTION: A support 1 is almost composed of an upper shoe 10 locked to a beam B, two rubber shoes 20 supporting at twp points, and each fixture 30 securing these shoes to a bent B. The upper shoe 10 mostly consists of a beam receiver part 11, a side wall part 12 and a base part 13. The rubber shoe 20 is almost made up of a spherical seat 21 and laminated rubber 22. The fixture 30 consists of an anchor bolt 31 embedded in the bent B, a sleeve 32, two anchor bolt seat plates 33 and 37 and so on.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a girder support structure and a girder support on which a straddle-type monorail runs.

[0002]

2. Description of the Related Art For example, a track of a so-called straddle type monorail (such as a monorail traveling between Haneda Airport and Hamamatsucho) is constructed by arranging columns of about 20 m long in a line. Each girder is installed between bridge piers or abutments (foundation structures). What supports such both ends of the girder is a bearing interposed between the lower surface of the end of the girder and the upper end of the pier P or the like. The bearing has a fixed bearing and a movable bearing, and one end of the girder is supported by the fixed bearing and the other end is supported by the movable bearing.

Conventionally, a pin type fixed bearing and a roller type fixed bearing have been provided.

The fixed bearing comprises an upper gear and a lower gear, both of which are pivoted by two pins so that the girder can rotate in a vertical plane. The movable bearing also consists of upper and lower shoes,
Two rollers are provided to allow the girder to pivot in a vertical plane and move axially.

With this structure, the girder can cope with the overturning moment, vertical load, and horizontal load.

The girder is supported by four points (two pins and two rollers).

[0007]

By the way, in the above-mentioned bearing, a gap is provided between the pin or roller and the support structure body so that they can be moved. Therefore, for example, when one of the gaps is expanded in the vertical direction due to wear over time, the track girder is in a state of supporting three points, and there is a problem that the girder rolls.

Further, since the pin or roller is used as a constituent element, the structure is complicated and the price is very expensive.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a bearing that can prevent the girder from being supported by three points and can be manufactured at low cost. In point.

[0010]

SUMMARY OF THE INVENTION The gist of the present invention is between a base part having an insertion opening at the center and bolt holes at both axial ends of the girder, and between the base part. A protrusion formed on the upper surface of the girder receiving portion, which is located above the girder receiving portion in the vertical direction and is in contact with the lower surface of the girder, and a side wall portion which is continuous with the girder receiving portion and the base portion. The part is fitted to the lower end of the girder,
The upper shoe fixed to the girder by embedding the anchor rebar with the fixed end part in the girder, the spherical seat formed on the upper surface of the two rubber shoe which is a laminated rubber having a through hole in the center,
The base part, the lower surfaces of the both ends located in the width direction of the girder are placed in contact with each other, and the insertion opening opened in the base part has a width shorter than the axial length of the girder, The upper end of the movement restricting member fixed to the substructure penetrates the insertion opening opened in the base part at least at an axial direction of the girder at an edge portion of the insertion opening, and as a girder receiving portion. , An anchor bolt having a lower end fixed to a substructure rotatably in at least a vertical plane in a space formed between the base and a bolt hole formed in the base. The upper shoe is inserted into the through hole opened in the rubber shoe and the upper shoe is attached to the substructure through the rubber shoe, which is in the support structure of the girder.

The length of the girder in the width direction of the base part can be made longer than the length of the girder receiving part in the girder width direction.

It is also possible to insert the anchor bolt into a sheath tube embedded in the substructure and having an elongated length in the axial direction of the girder. Further, a void is formed at the lower end of the sheath tube, and a seat plate for anchor bolts inserted by an anchor bolt can be brought into contact with the upper surface of the void in a state where the anchor bolt is fastened.

Also, the seat plate for the anchor bolt may be in the shape of a semi-cylindrical hoop which bulges upward.

Further, a fixing plate which abuts a portion of the movement restricting member located in the width direction of the girder can be fixed to the upper surface of the base portion.

[0015]

Since the pin or roller is not a constituent element, the gap is not a constituent element. Therefore, the gap is not expanded in the vertical direction and the girder is not in the three-point supporting state.

Further, since the pin or the roller is not used as a constituent element, the structure can be simplified.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bearing according to an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a bearing 1 according to this embodiment.
Supports the girder B for the straddle type monorail M,
It is fixed to a bridge pier P or an abutment (not shown) which is a foundation structure, and supports both ends of each girder B.

As shown in FIG. 2, the support 1 includes an upper shoe 10 fixed to the girder B, two rubber shoes 20 supporting the upper shoe 10 at two points, and a fixing fixing these to the pier P. It is roughly configured by a tool 30.

As shown in FIG. 2, the upper shoe 10 has a substantially rectangular outer contour when viewed from the front, with its central portion opened in the axial direction of the girder B in the installed state, and is an integrally formed steel member (SC).
450). FIG. 2 is a partially cutaway front view showing the girder B together with the bearing 1, and the direction perpendicular to the paper surface is the axial direction of the girder B.

The upper shoe 10 is provided with a girder receiving portion 11, a side wall portion 12, and a base portion 13, which form a base body of the upper shoe 10.

As shown in FIGS. 2 to 4, the girder receiving portion 11 is
It is located on the upper shoe 10 and is formed in a rectangular plate shape in a plan view, and its upper surface is in contact with the lower surface of the end portion of the girder B. As shown in FIG. 3, a convex portion 11a having a cross shape in plan view is formed on the upper surface, and is fitted to the lower surface of the end portion of the girder B. Further, the end portion of the anchor rebar 11b embedded in the girder B is welded.

These anchor rebars 11b and the above-mentioned convex portion 1
The upper shoe 10 is fixed to the girder B by 1a. In other words, the end portion of the girder B in the erected state is movably fixed to the pier P via the upper shoe 10.

The side wall portion 12 is formed between the girder receiving portion 11 and the base portion 13 so as to bridge them vertically.
As shown in FIG. 4, the lower bottom is formed in a substantially trapezoidal shape shorter than the upper bottom in a side view. The position extends vertically from the lower surface of the girder receiving portion 11 in the vicinity of both ends of the girder B in the width direction.

Between the outer surface of the side wall portion 12 and the upper surface of the base portion 13, ribs 14 having a substantially right triangle in a front view are provided on both sides with a bolt hole 13b described below interposed therebetween (this embodiment). (4 in the example).

The base portion 13 is formed in a plate shape whose center portion is slightly thicker than both end portions (end portions in the width direction of the beam B). The length of the beam B in the width direction is longer than that of the beam receiving portion 11. An insertion opening 13a having a rectangular shape in plan view is opened in the central portion in plan view. Bolt holes 13b are opened in the axial center of the beam B at both ends of the base portion 13. The lower surfaces of both end portions of the base portion 13 are in contact with the rubber shoe 20. Protrusions 13c are provided at the four corners of the bottom surface of the base portion 13
Are provided separately for each. Except for these protrusions 13c,
The bottom surfaces of both ends of the base 13 are spherical surfaces (concave surfaces) that are recessed upward.
Is formed. The radius of curvature of the spherical surface is slightly (for example, about 1%) larger than that of the spherical seat 21 of the rubber shoe 20 described later. It is also possible to form the lower surfaces of both ends of the base portion 13 to be smooth.

A space 16 which is surrounded by the girder receiving portion 11, the base portion 13 and the two side wall portions 12 and which penetrates the girder B in the axial direction is formed. Ribs 15 are formed on the inner peripheral surfaces of the girder receiving portion 11, the base portion 13 and the two side wall portions 12.

As shown in FIGS. 2, 4, and 5, the rubber shoe 20 has a substantially rectangular prism shape with a short outer contour. The upper part forms a spherical seat 21 that bulges upward, and a steel member (for example, S
CW480 etc.). Therefore, the upper surface of the rubber shoe 20 and the lower surface of the base 13 are in surface contact (strictly, line contact). The lower approximately half is the laminated rubber 22. The spherical seat 21 and the laminated rubber 22 are integrally molded. As shown in FIG. 5, a central hole 23 having a circular cross section is formed in the center of the rubber shoe 20 in a plan view so as to penetrate in the height direction. The rubber dregs 20 is installed on the upper surface of the pier P via a liner 24 on the upper surface of a steel plate (for example, SS400, etc.) 60 which is buried with the upper surface exposed.

The upper shoe 10 constructed as described above is attached to the pier P by a fixture 30 via each rubber shoe 20.

As shown in FIG. 2, the fixture 30 has anchor bolts 31 having both ends threaded, a sheath pipe 32 for accommodating the anchor bolts 31, and anchor bolts respectively located at both ends of the anchor bolt 31. Seat plates 33, 37, a seat plate housing hole 35 for housing the anchor bolt seat plate 33, and a nut with a cone 3 screwed into both ends of the anchor bolt 31 separately.
4 and 38 are provided.

The sheath pipe 32 is embedded in the pier P so that its axial direction is vertical and its upper end is flush with the upper surface of the steel plate 60. The cross section is a tubular body having an oval cross section as shown in FIG. In the embedded state, the major axis direction is parallel to the axial direction of the girder B.

The lower end of the sheath pipe 32 is continuous with the space in which the bolt can be embedded (the seat plate storage hole 35). Seat board storage hole 35
Is formed by a casing 36 embedded in the pier P. The casing 36 is reduced in diameter from approximately the center in the height direction to the upper end to form a neck portion 36a, and a collar 36b is provided at the upper end.
Is a vase-shaped body having a rectangular cross-section. The lower end of the sheath tube 32 is fitted in the neck portion 36a.

As shown in FIGS. 7 to 10, the anchor bolt seat plate 33 has a semi-cylindrical shape with a curved surface formed on one surface thereof. In the center of the plan view, a tapered hole 3 is formed so that the diameter gradually decreases from the flat surface to the curved surface.
3a (not shown in FIG. 7) is formed. In the fastened state, the upper surface of the seat plate storage hole 35 (the lower end of the neck portion 36a) is in line contact with the beam B in the width direction.

As shown in FIGS. 11 and 12, the conical nut 34 has a tapered hole 3 in the anchor bolt seat plate 33.
A truncated cone part 34a, which is tapered so that it can be fitted into 3a
(Not shown in FIG. 11) is formed at the lower end.

The sheath pipe 32 is embedded together with the casing 36 when the pier P is formed. Anchor bolt seat plate 3
3 is stored in the seat plate storage hole 35 when the girder B is installed. In such storage, first, the anchor bolt 31 with the anchor bolt seat plate 33 and the conical nut 34 attached to the lower end is aligned with the longitudinal direction of the anchor bolt seat plate 33 in the longitudinal direction of the horizontal cross section of the sheath pipe 32. Then, it is inserted into the buried sheath tube 32. When the anchor bolt seat plate 33 and the conical nut 34 reach the seat plate storage hole 35, the anchor bolt 31 is rotated 90 ° around its axial direction. Such rotation is performed by applying a spanner to a spanner hook 31a provided on the upper end of the anchor bolt 31. When attempting to pull out the anchor bolt 31, the anchor bolt seat plate 33 contacts the upper surface of the casing 36. Through the above steps, the anchor bolt 31 becomes incapable of being pulled out.

The upper end of the anchor bolt 31 is fastened by a nut 38 with a cone via an anchor bolt seat plate 37. The conical nut 38 is the conical nut 34.
It is similar to the above, but can be partially inserted into the anchor bolt seat plate 37. The anchor bolt seat plate 37 is similar to the anchor bolt seat plate 33 and is slightly smaller. In the fastened state, the curved surface is directed downward and the upper surfaces of both end portions of the base portion 13 are in line contact with each other.

Further, as shown in FIG. 2, an H steel (movement restriction member) 40 penetrates the insertion opening 13a of the base portion 13, an end portion thereof is present in the space 16, and the surface of the flange 40a is a girder B. Is vertically embedded in the pier P in a state of being parallel to the axial direction of. As shown in FIG. 13, the girder receiving portion 11 (not shown in FIG. 13) has an insertion opening 13a opened in the base portion 13 of the upper shoe 10 and a clearance c at its edge so that the girder receiving portion 11 is free from play. Has been inserted.

The edge of the fixed plate 70 is in contact with the outside of the flange 40a of the H steel 40. As shown in FIG. 13, the fixing plate 70 is a plate-shaped body made of steel and having a rectangular shape in plan view, and its edge is welded to the upper surface of the base 13.

The bearing 1 constructed as described above is attached to the pier P as follows. First, the lower end of the anchor bolt 31 is locked to the bridge pier P by the method described above, and the liner 24 and the rubber shoe 20 are sequentially inserted from the upper end.

Next, the bolt hole 13b is inserted into the anchor bolt 31, and the upper shoe 10 is placed on the rubber shoe 20 so that the insertion opening 13a is loosely inserted into the upper end portion of the H steel 40 embedded in the pier P. To do. The H steel 40 is buried when the bridge pier P is created.

Next, after positioning the upper shoe 10, the nut 38 with a cone is tightened.

Next, the edge of the fixed plate 70 is brought into contact with the outer surface of the flange 40a so that the upper shoe 10 can slide, and the other edge is welded to the upper surface of the base 13.

The girder B can be erected on the pier P by the above steps.

Next, the operation of the bearing 1 constructed as described above will be described.

The rotation of the girder B within the vertical plane is possible by the deformation of the laminated rubber 22 (mainly the compression bias deformation).

Movement in the horizontal direction (axial direction of the girder B) is
This is possible due to (1) shear deformation of the laminated rubber 22, (2) clearance between the anchor bolt 31 and the sheath tube 32, and (3) gap c between the insertion port 13a and the H steel 40. The widthwise movement of the beam B is restricted by the fixed plate 70.

Due to this action, the bearing 1 according to the present embodiment.
Has a function as a movable bearing (movable horizontally, rotatable). Therefore, the horizontal displacement in the axial direction due to the expansion and contraction of the girder B is absorbed by the horizontal movement of the two bearings 1 fixed to both ends of the girder B.

Furthermore, the support 1 moves in the axial direction of the girder B due to expansion and contraction, and the edge of the insertion opening 13a abuts the upper edge of the flange 40a of the H steel 40 fixed to the pier P. Then, the girder B cannot move any further (actually, it is necessary that such abutment occurs in the bearings 1 provided at both ends of the girder B). Therefore, it also functions as the fixed bearing 1. Therefore, there will be no loss of digits in the event of an earthquake.

The tension of the anchor bolt 31 resists the lifting force.

The liner 24 laid under the rubber shoe 20 enables positioning.

Since the bearing 1 according to this embodiment is constructed as described above, the following effects can be obtained.

Since the pin or the roller is not a constituent element, it is possible to prevent the girder B from being in a three-point supporting state. As a result, rolling of the girder B can be prevented, and the safety of the monorail M can be improved.

Further, the structure is simplified as described above. That is, there is no equivalent to the lower shoe in the conventional bearing. Therefore, the cost can be significantly reduced.

Further, in the conventional case, one end has a fixed bearing 1,
Although the other end is the movable bearing 1, according to the present embodiment, one type of bearing 1 is sufficient. As a result, the production cost can be reduced.

Since the length of the girder B of the base portion 13 in the width direction is longer than that of the girder receiving portion 11, the length of the base portion 13 is shorter than that of the girder receiving portion 11. It is possible to counter the overturning moment of the girder B with a small tension force of the anchor bolt 31.

The bearing 1 according to this embodiment supports the girder B on which the straddle-type monorail M travels.
The present invention is not limited thereto, and can be applied to those suitable for carrying out the present invention, such as a girder on which another transportation means travels.

In this embodiment, the bearing 1 is the pier P.
However, in the present invention, it can be attached to a substructure suitable for carrying out the present invention, such as an abutment.

The bearing 1 is fixed to the end of the beam B, but in the present invention, it can be fixed to a suitable position for carrying out the present invention, such as the central portion.

Further, the H steel 40 embedded in the pier P is used as the movement restricting member for restricting the axial movement of the girder B of the upper shoe 10; however, in the present invention, for example, I-shaped steel, A channel steel, a steel pipe or the like suitable for carrying out the present invention can be used.

Further, the method of fixing the bearing 1 to the girder B, the method of erection of the girder B, etc. are not limited to this embodiment,
It can be carried out by a suitable method for carrying out the present invention.

Further, the shapes and materials of the upper shoe 10 and the rubber shoe 20 are not limited to those in the present embodiment, and are suitable for carrying out the present invention unless otherwise specified. can do.

Further, the convex portion 11a, the insertion hole 13a, the rib 1
4, 15, the sheath pipe 32, the shape and position of the casing 36,
The number, arrangement, etc. of the anchor reinforcing bars 11b are not limited to those in the above-mentioned embodiment, and unless otherwise specified, the shape, position and number suitable for the present invention can be adopted.

In the above figure, the same components are designated by the same reference numerals.

[0064]

Since the present invention is constructed as described above, it has the following effects. Since the pin or the roller is not a constituent element, it is possible to prevent the girder from being in a three-point supporting state. As a result, rolling of the girder can be prevented and the safety of the monorail can be improved.

Further, since the structure is simple, the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a usage state of a bearing according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of a bearing according to an embodiment of the present invention.

FIG. 3 is a plan view of a bearing according to an embodiment of the present invention.

FIG. 4 is a side view of the bearing according to the embodiment of the present invention.

FIG. 5 is a plan view of a rubber shoe.

FIG. 6 is a cross-sectional view of a sheath tube.

FIG. 7 is a sectional view taken along line BB of FIG. 2;

FIG. 8 is a plan view of a seat plate for anchor bolts.

FIG. 9 is a front view of a seat plate for anchor bolts.

FIG. 10 is a side view of a seat plate for anchor bolts.

FIG. 11 is a plan view of a nut with a cone.

FIG. 12 is a side view of a nut with a cone.

FIG. 13 is a view on arrow A in FIG.

[Explanation of symbols]

 B ... Girder M ... Monorail P ... Bridge pier c ... Gap 1 ... Bearing 10 ... Upper sink 11 ... Girder receiving part 11a ... Convex part 11b ... Anchor rebar 12 ... Side wall part 13 ... Base part 13a ... Insert port 13b ... Bolt hole 13c ... Protrusions 14, 15 ... Ribs 16 ... Space 20 ... Rubber trough 21 ... Spherical seat 22 ... Laminated rubber 23 ... Center hole 24 ... Liner 30 ... Fixing tool 31 ... Anchor bolt 31a ... Spanner hook 32 ... Sheath pipe 33,37 ... Anchor Bolt seat plate 33a ... Through holes 34, 38 ... Conical nut 34a ... Frustum part 35 ... Seat plate storage hole 36 ... Casing 36a ... Neck part 36b ... Tsuba 40 ... H steel 40a ... Flange 60 ... Steel plate 70 ... Fixed plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Akiyama 3-1-3-502 Iizuka, Kawaguchi City, Saitama Prefecture (72) Inventor Soichiro Shimizu 2-7-5 Higashishimbashi, Minato-ku, Tokyo (72) Inventor Shiro Matsumoto 700-70 Tomuro, Atsugi City, Kanagawa Prefecture

Claims (9)

[Claims] 1. A support structure for a girder installed on a pier, abutment or other foundation structure, the base having an insertion opening at the center and bolt holes at both axial ends of the girder. And a girder receiving part that is positioned above the base part with a vertical space therebetween and is in contact with the lower surface of the girder, and a side wall part that is continuous with the girder receiving part and the base part. The convex portion formed on the upper surface of the girder receiving portion is fitted to the lower end portion of the girder, and the anchor bar whose end portion is fixed is embedded in the girder so that the girder is fixed to the girder. However, the lower surface of both ends of the base portion located in the width direction of the girder abuts on the spherical seat formed on the upper surface of the two rubber troughs, which are laminated rubbers having a through hole in the center, respectively. The movement of the insertion opening opened in the base portion, which has a width shorter than the axial length of the girder and is fixed to the substructure. The upper end portion of the regulating member penetrates the insertion opening opened in the base portion with a gap at least in the axial direction of the girder at the edge portion of the insertion opening, the girder receiving portion, and the base portion. An anchor bolt having a lower end fixed to the substructure so as to be rotatable at least in a vertical plane, in the space formed between the bolt hole and the bolt hole opened in the base; A support structure for a girder, which is inserted into the through hole formed in the rubber shoe, and the upper shoe is attached to the substructure through the rubber shoe. 2. The bearing structure according to claim 1, wherein the length of the girder in the width direction of the base part is longer than the length of the girder receiving part in the girder width direction. 3. The bearing structure according to claim 1, wherein the anchor bolt is inserted into a sheath tube which is embedded in a substructure and whose axial length of the girder is extended. 4. A cavity is formed at a lower end of the sheath tube, and an anchor bolt seating plate inserted by the anchor bolt is in contact with an upper surface of the cavity in the cavity. Support structure. 5. The bearing structure according to claim 4, wherein the seat plate for the anchor bolt is in the shape of a semi-cylindrical hoop that bulges upward. 6. The bearing structure according to claim 1, wherein a fixing plate that abuts a portion of the movement restricting member positioned in the width direction of the girder is fixed to an upper surface of the base portion. 7. A support for a girder attached to a bridge pier, abutment or other substructure, the base having an insertion opening at the center and bolt holes at both axial ends of the girder. A girder receiving portion that is located vertically above the base portion and is in contact with the lower surface of the girder, and a side wall portion that is continuous with the girder receiving portion and the base portion. A bearing with an upper shoe formed with. 8. The bearing according to claim 7, wherein a length of the girder in the width direction of the base part is longer than a length of the girder receiving part in the girder width direction. 9. A rubber shoe made of laminated rubber, which has a spherical seat that abuts the lower surface of the upper shoe of claim 7 and which has a through hole formed in the center thereof.