JP4448526B2 - Base plate installation structure - Google Patents

Description

  The present invention relates to a structure for mounting a base plate such as a bridge support device for a concrete structure.

  In recent years, when the bearing device is designed so that the lifting force is countered (resisted) by the adhesive force of the anchor bolt in the Type B bearing due to the revision of the road bridge specifications, the lifting force (design Therefore, in order to increase the adhesion between the anchor bolt and the concrete of the substructure, a different diameter steel bar (D25 to D51) or an anchor bolt equivalent thereto, for example, as shown in FIG. It is necessary to use anchor bolts 9 (9A) with spiral rebars 24, which are formed by welding 6φ steel wires or rebars in a spiral shape to the round steel bars for anchors and having a large outer diameter in the cross section of the shaft portion.

  Generally, a pretension type cross section T-shaped girder, a post tension type cross section T girder (not shown), or a base plate-integrated distributed bearing used for an upper structure 14 made of steel or the like as illustrated. In such a case, the anchor bolt 9 (9A) to be fixed to the substructure (understructure) 2 side can be inserted from the upper side of the base plate 5 so that the installation of the support device is facilitated and only the support device is provided. Therefore, the carrying work is facilitated, and the anchor bolt 9 (9A) that protrudes downward is not carried and attached, so that the vertical space is small. There is an advantage that the method of installing the bearing device is simplified. However, as shown in FIG. 10, the diameter (outer diameter) d of the anchor bolt main body 21 is larger than the diameter d1 of the small-diameter male screw shaft 8 at the top of the anchor bolt 9 (9B) such as a different diameter steel bar. When the anchor bolt 9 (9B) is used to set the anchor bolt 9 (9B) from the upper side of the base plate 5 by hanging or the like, or the anchor bolt with spiral rebar 24 is set to be suspended When doing so, it is necessary to determine the diameter (inner diameter) D of the anchor bolt insertion hole 13 of the base plate 5 larger than the diameter of the anchor bolt main body 21 or the outer diameter of the shaft cross section. The problem that the gap between the small-diameter male screw shaft 8 at the top of the anchor bolt 9 (9B) and the anchor bolt insertion hole 13 becomes too large. A.

  As described above, when the gap between the anchor bolt insertion hole 13 and the anchor bolt 9 (9B) in the base plate 5 of the support device 22 is large, horizontal force due to seismic force acts on the lower structure 2 or laterally. When the upper structure 14 supported by the elastic bearing device shear-deformed in the direction is displaced in the lateral direction due to vibration, the base plate 5 also moves laterally and the anchor plate 9 bears the load of the upper structure. This is not preferable because a large horizontal impact force (shearing force) due to the lateral movement of 5 acts.

  Conventionally, when installing a bridge support device such as an elastic support device for a bridge on a lower structure, (1) the diameter (inner diameter) of an anchor bolt insertion hole 13 in a base plate 5 of the support device as shown in FIGS. ) Since D is smaller than the outer diameter dimension d of the anchor bolt main body 21 of the anchor bolt 9 (9B), the anchor bolt 9 (9B) cannot be inserted from above the base plate 5; The upper end of the anchor bolt 9 (9B) is inserted, the nut 12 is screwed onto the male screw shaft 8 at the upper end of the anchor bolt 9 (9B), and the anchor bolt 9 (9B) is suspended from the base plate 5 Thus, the entire support device 22 is lifted and conveyed to a predetermined installation position.

  (2) As shown in FIG. 12, when setting the anchor bolt 9 (9A) with the spiral rebar 24 from above the base plate 5, the bolt shaft diameter d1 of the anchor bolt 9 (9A) The outer diameter dimension d3 of the shaft cross section is increased, and it is necessary to further increase the dimension D of the anchor bolt insertion hole 13 of the base plate 5 than the outer diameter dimension d3.

  Otherwise, after the base plate 5 is installed, it becomes impossible to perform post-installation by inserting the anchor bolt 9 (9A) into the base plate 5. When the dimension D of the anchor bolt insertion hole of the base plate 5 is set to be large, the steel washer 11 fitted to the anchor bolt 9 (9A) as shown in FIG. It is necessary to weld 25 around the entire circumference, and the gap between the anchor bolt insertion hole 13 of the base plate 5 and the bolt shaft portion (male screw shaft portion 8) of the anchor bolt 9 (9A) becomes relatively large. There is.

(3) As shown in FIG. 6, a coupler 20 is disposed below the base plate 5, an upper end portion of the anchor bolt 19 is connected to the lower portion of the coupler 20, and the bolt 19 is connected to the coupler from above the base plate 5. There is also known an installation structure in which the base plate 5 is connected to the lower structure 2 by being connected to 20 by the coupler 20, the anchor bolt 9 and the bolt 19.
Further, (4) as a structure for fixing an anchor bolt to a base plate, a structure in which an anchor bolt, a stepped coupler and welding are combined and fixed is also known. (For example, see Patent Document 2)
JP 2001-3313 A JP 2002-250008 A

  In the case of the conventional (1), since the anchor bolt 9 (9B) cannot be inserted from above the base plate 5, the upper end of the anchor bolt 9 (9B) is inserted from the lower side of the base plate 5, and the anchor bolt is inserted. Since the nut 12 is screwed onto the upper end of 9 (9B) and the anchor bolt 9 (9B) is suspended from the base plate 5, the entire support device 22 is lifted and conveyed to a predetermined installation position. The anchor bolt 9 (9B) suspended on the arm collides with the lower structure 2 or the like in the middle of conveyance, damages the anchor bolt 9 (9B) or the lower structure 2, or the lower structure during the lowering conveyance. There was a possibility that the rubber layer 23 in the support device 22 was damaged by colliding with the object 2 and coming out of the base plate 5.

  In addition, since the anchor bolt 9 (9B) must be transported in a state suspended from the base plate 5, if the anchor bolt 9 (9B) is suspended in the base plate 5 and has a large vertical size, Along with that, it was necessary to take a large space. In the case of (2), since it is necessary to weld the entire circumference of the steel washer 11, the welding operation of the welded portion is complicated and the adverse effect of the welding heat is not received by the support rubber portion. As described above, the distance from the washer welded portion 25 to the rubber portion needs to be relatively large and separated, and it is necessary to have a high degree of skill in the welding operation, and these operations are on-site construction. Therefore, there is a problem that the construction cost becomes high.

  In the case of (3), the anchor bolt and the coupler 20 cannot be mounted from the upper side of the base plate, and there are also three parts for fixing the base plate to the lower structure. There is a problem that the number of parts cannot be increased and the number of parts increases.

  Further, in the case of (4), the anchor bolt head is located in the base plate and uses welding, so that there is a problem that the work for exchanging the support at the time of repair or the like is difficult. .

In the present invention, it is not necessary to transport the anchor bolt 9 while being suspended from the base plate 5 of the elastic support body 4. After the elastic support body 4 is transported and arranged, the anchor bolt 9 is moved to the base plate 5 of the elastic support body 4. The base plate 5 can be easily installed on the lower structure 2 and the number of parts when the base plate 5 is fixed to the lower structure is set to two parts. less then, an object of the invention to provide a mounting structure of a base Supureto that to be able to easily perform further replacement of bearing apparatus.

To solve the problems described above, in the mounting structure of the engagement behenate Supureto to claim 1 of the present invention, the insertion hole of the base Supureto, anchor bolts connecting fitting is inserted, in the bearing device or the like by the anchor bolt connecting fitting in mounting structure of the base plate is fixed to the concrete structure behenate Supureto, the anchor bolt connecting fitting comprises a coupler shaft body of a solid in a circular cross section which is disposed fitted rotatably in the insertion hole of the base plate And the length of the coupler shaft main body in the axial direction is longer than the thickness of the base plate, and is connected to the lower end of the coupler shaft main body to the upper male screw shaft of the anchor bolt. An anchor bolt connecting portion having a female screw hole that opens downward is provided integrally, and the anchor bolt connection Are provided at a lower level than the base plate, and the anchor bolt connecting portion and the coupler shaft main body are concentric and have the same outer diameter. The upper end of the coupler shaft main body is connected to the upper surface of the base plate. A coupler-type coupling metal fitting having a flange projecting in a lateral direction having a bottom surface to be joined and a rotating tool engaging portion provided at an upper end portion of the coupler shaft main body. .

The invention of claim 2 is the mounting structure of the base Supureto according to claim 1, wherein the rotating tool engaging portion, the rotary tool engaging composed of the flange of planar polygons laterally protruding engagement Or a rotating tool engaging portion provided at the upper end of the coupler shaft main body, or a rotating tool engaging portion provided at the upper end of the coupler shaft main body. It is any one rotation tool engagement part of the rotation tool engagement part which consists of a convex part which has a combined outer peripheral surface, It is characterized by the above-mentioned.

According to the first aspect of the present invention, the anchor bolt connecting bracket includes a solid coupler shaft body having a circular cross section and rotatably fitted in the insertion hole of the base plate, and the axial direction of the coupler shaft body. Is connected to the lower end of the coupler shaft main body, which is longer than the thickness of the base plate and larger than the outer diameter of the anchor bolt, to the upper male screw shaft of the anchor bolt. An anchor bolt connecting portion having a female screw hole that opens downward, and the anchor bolt connecting portion at a lower level than the base plate, and the anchor bolt connecting portion and the coupler shaft main body Concentric and has the same outer diameter, and protrudes in the lateral direction with a lower surface engaging the upper surface of the base plate at the upper end of the coupler shaft body. Since it is a coupler-type coupling fitting provided with a flange and a rotating tool engaging portion provided at the upper end of the coupler shaft main body, after placing the base plate of the bearing device or the like on the concrete structure It is possible to mount and support a coupler-type connecting bracket fitted with anchor bolts from the upper side of the base plate, to reduce the number of fixtures for fixing the base plate, and the upper end position of the anchor bolt is Since it is located below the lower surface position, the support device including the base plate can be easily replaced after the coupler-type coupling fitting is removed from the base plate.
In addition, it is possible to prevent the base plate from being lifted by using the flange at the upper end of the coupler-type connection fitting, and to reduce the number of parts for mounting the base plate to two parts per one insertion hole of the base plate. An effect is obtained.
According to the second invention, the rotating tool engaging portion is a rotating tool engaging portion formed of the planar polygonal flange projecting in the lateral direction, or a rotating tool engaging portion provided at the upper end portion of the coupler shaft body. Either a rotating tool engaging portion comprising a concave portion having a combined inner peripheral surface, or a rotating tool engaging portion comprising a convex portion having an outer peripheral surface for rotating tool engagement provided at the upper end of the coupler shaft body. Since this is a single rotating tool engaging portion, the rotating tool engaging portion that does not protrude above the thickness of the base plate or does not protrude greatly from the base plate is provided. It can be easily provided, and the head of the coupler-type coupling fitting can be made relatively thin.

  Next, the present invention will be described in detail based on the illustrated embodiment.

  FIG. 1 shows a state in which the base plate 5 of the support device 22 is fixed to the concrete substructure 2, and FIGS. 2 to 5 show component drawings.

  As shown in FIG. 1, a plurality of anchor bolt insertion recesses 1 are formed on the upper part of a concrete substructure 2 such as a pier or an abutment so as to be positioned at four corners of a plane rectangle by boxing or the like. A plurality of steel height adjusting liner plates are arranged on the upper surface 3 of the concrete substructure 2 at intervals between the anchor bolt insertion recesses 1 in the front-rear and left-right directions (for example, four locations). ), And the base plate 5 in the support device 22 having the steel base plate 5 that supports the lower surface of the elastic support 4 together with the annular elastic support 4 having the elastic layer 4a at the intermediate portion. It is placed.

  Flat circular insertion holes 10 are provided at the four corners of the base plate 5 in the support device 22, and a shaft portion of a columnar steel anchor bolt coupling member 17 having a flange 15 at the upper portion is provided in the insertion hole 10. The base plate 5 in the support device 22 is fixed to the lower structure 2 by the anchor bolt connecting fitting 17 and the anchor bolt 23 connected thereto.

  The anchor bolt coupling bracket 17 includes a solid coupler shaft main body 18 with a circular cross section that is rotatably fitted in the insertion hole of the base plate 5. The length L in the axial direction is longer than the thickness T of the base plate 5 and is larger than the outer diameter D of the anchor bolt 23 at the lower end of the coupler shaft main body. An anchor bolt connecting portion 27 having a female screw hole 26 opening downward for connecting to the upper end male screw shaft portion 8 of the bolt 23 is integrally provided, and the anchor bolt connecting portion 27 is lower than the lower surface level of the base plate 5. In addition, the anchor bolt connecting portion 27 and the coupler shaft body 18 are concentric and have the same outer diameter, and the coupler shaft body 1 Are provided with a flange 15 projecting in the lateral direction having a lower surface engaged with the upper surface of the base plate 5, and a rotating tool engaging portion 28 provided at the upper end of the coupler shaft body 18. It is a coupler type connecting bracket.

In the illustrated embodiment, the rotating tool engaging portion 28 is a rotating tool engaging portion 28 formed of a flat rectangular concave portion. However, as shown in FIG. 3, the flange 15 has a flat polygonal shape. Accordingly, the side peripheral surface of the flange 15 may be used as the rotating tool engaging portion 28.
Although not shown, a form in which a protrusion for engaging the rotating tool is provided at the center on the upper surface side of the flange 15 is also conceivable. In addition, the configuration in which the elastic layer in the support device undergoes shear deformation is preferable because there is no possibility of interference with the rotating tool engaging protrusion, and the outer dimension of the base plate is reduced.
In addition, although illustration is abbreviate | omitted, you may make it provide the rotation tool engaging part which consists of a convex part which has the outer peripheral surface for rotation tool engagement integrally in the upper end part of a coupler axial part main body.

  Since the insertion hole 10 in the base plate 5 is larger than the outer dimensions of the anchor bolt 23, the base screw 5 is connected to the anchor bolt connecting bracket 17 with the male screw shaft portion 8 at the upper end of the anchor bolt 23 being attached. Can be set by dropping from above the base plate 5 and placed in the anchor bolt insertion recess 1 of the lower structure 2 through the concrete or non-shrink mortar 16. It can be fixed to the structure 2.

When the anchor bolt coupling bracket 17 and the anchor bolt 23 are combined as described above, a coupler type coupling in which the anchor device 23 is mounted from the upper side of the base plate 5 after the support device 22 and its base plate 5 are arranged on the lower structure 2. The metal fitting 17 can be placed and supported, the number of fixtures for fixing the base plate 5 can be reduced to two parts, and the upper end position of the anchor bolt 23 is positioned below the lower surface position of the base plate 5. Therefore, after the engagement between the upper structure 14 and the upper portion of the support device is released and the coupler-type coupling bracket 17 is removed from the base plate 5, the upper structure 14 is slightly jacked up with a hydraulic jack or the like. The base device including the base plate 5 can be easily moved laterally to create a new base It can be replaced with bearing devices including rate. In addition, after setting the support device including the base plate 5, the anchor bolt coupling bracket 17 is inserted into the insertion hole 10 of the base plate 5 and is screwed into the male screw shaft portion 8 of the anchor bolt 23, so that the new base plate 5 can be easily attached. The supporting device including the above can be fixed to the lower structure 2.
In addition, the lower surface of the flange 15 at the upper end of the coupler-type coupling metal 17 can be engaged with the upper surface 3 of the base plate 5 to prevent the base plate 5 from being lifted using the coupling metal 17.

  Further, the rotating tool engaging portion 28 is for rotating tool engaging provided at the upper end portion of the rotating tool engaging portion 28 including the planar polygonal flange projecting in the lateral direction or the coupler shaft body 18. Since the rotating tool engaging portion is one of the rotating tool engaging portions 28 formed of the concave portion having the inner peripheral surface, the head of the coupler-type coupling fitting is located above the thickness dimension of the base plate 5. The head of the coupler-type connection fitting can be made thin without protruding.

  In the illustrated embodiment, the elastic support body 4 is mounted on the base plate 5 while the annular elastic support body 4 is mounted thereon and the annular steel upper member 29 is mounted on the elastic support body 4. A male threaded shaft portion 36 of the central protrusion 30 for constraining the shear deformation of the elastic layer 4a is screwed into the female thread hole of the base plate 5 and is engaged with the upper surface of the upper steel member 29. The flange 31 prevents the annular elastic support body 4 and the annular steel upper member 29 from floating.

  Further, a planar annular protrusion 32 is provided on the upper portion of the steel upper member 29, and the outer upper portion of the annular protrusion 32 is a bearing surface of a sole plate 33 such as a steel annular plate. A sole plate 33 is placed on the surface, and the lower flange 34 of the steel upper structure 14 placed on the sole plate 33 has bolts 35 from above, through which the lower flange 34 and the sole plate 33 are inserted. And the upper structure 14 is connected to the lower structure 2 via the support device 22 by being screwed into the female screw hole of the steel upper member 29.

  When the present invention is implemented, the coupler-type connecting bracket 17 may be applied to a base plate other than the illustrated support device.

The base plate mounting structure according to the present invention can be applied to the base plate mounting structure in the displacement limiting device 37 as shown in FIG.
In the above embodiment, the base plate installation structure for the concrete substructure is shown. However, the upper structure is a concrete structure, and the present invention is applied to a configuration in which the base plate is installed on the upper structure. Also good.
When carrying out the present invention, although not shown, in order to facilitate the work when the anchor bolt connecting bracket 17 is removed and the bearing device 22 is replaced, the lower portion of the anchor bolt connecting bracket 17 and the concrete or non-shrinkage are provided. It is preferable to prevent adhesion to the mortar 16, and for that purpose, a release agent may be applied to the lower part of the anchor bolt coupling metal 17, or vinyl chloride is applied to the lower part of the anchor bolt coupling metal 17. If the bag body or container having an open bottom such as the above is fitted to the anchor bolt connecting bracket 17 so as to be rotatable, the anchor bolt connecting bracket 17 may be reliably removed.

It is a longitudinal front view which shows the installation structure of the base plate in the elastic support apparatus for bridges, etc. of this invention. 1A and 1B show an embodiment of a coupler-type coupling fitting, where FIG. 1A is a bottom view, FIG. 1B is a front view, and FIG. The other form of a coupler-type coupling metal fitting is shown, (a) is a bottom view, (b) is a front view, (c) is a top view. It shows one form of the base plate, (a) is a plan view, (b) is a front view. It is the front view and top view which show one form of the protrusion for a shearing force deformation | transformation restraint for restraining the shear deformation of the elastic layer in a support apparatus. It is a vertical front view which shows one form of the conventional baseplate installation structure. It is a partially vertical front view which shows the state which suspended and latched the anchor bolt of the conventional form to the baseplate. It is a vertical front view which shows the installation process of the conventional elastic support body for bridges. It is a longitudinal front view which shows the state which has suspended and conveyed the conventional elastic support body for bridges with the crane etc. FIG. It is a longitudinal front view which expands and shows a part of FIG. It is a vertical front view which shows the state arrange | positioned in the predetermined level of a lower structure while anchoring and anchoring an anchor bolt to the base plate in an elastic support body. It is a vertical front view which shows the relationship between the conventional anchor bolt and the anchor bolt insertion hole in a base plate. It is a longitudinal front view which expands and shows a part of the state arrange | positioned in the predetermined level of the lower structure while hanging and latching the conventional anchor bolt to the base plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anchor bolt insertion recessed part 2 Lower structure 3 Upper surface 4 Elastic support body 5 Base plate 6 Height adjustment liner plate 7 Different diameter steel bar 8 Male threaded shaft part 9 Anchor bolt 10 Insertion hole 11 Steel washer 12 Nut 13 Anchor bolt insertion Hole 14 Superstructure 15 Flange 16 Concrete or non-shrink mortar 17 Anchor bolt connecting bracket 18 Coupler shaft body 19 Bolt 20 Coupler 21 Anchor bolt body 22 Bearing 23 Anchor bolt 24 Spiral rebar 25 Welding 26 Female screw hole 27 Anchor bolt connection Part 28 Rotating tool engaging part 29 Steel upper member 30 Central protrusion 31 Upper flange 32 Annular protrusion 33 Sole plate 34 Lower flange 35 Bolt 36 Male screw shaft part

Claims (2)

The insertion hole of the base Supureto, anchor bolts connecting fitting is inserted, the mounting structure of the by the anchor bolt connecting fitting Liberation Supureto is fixed to the concrete structure behenate Supureto, the anchor bolt connecting fitting is inserted in the base plate The coupler shaft main body having a circular cross section that is rotatably fitted and disposed in the hole is provided, and the axial length of the coupler shaft main body is longer than the thickness of the base plate. And an anchor bolt connecting portion having a female screw hole opened downward for connecting to the upper end male screw shaft portion of the anchor bolt at the lower end portion of the coupler shaft main body having an outer diameter size larger than the outer diameter size of the anchor bolt And the anchor bolt connecting portion at a lower level than the base plate, and The anchor bolt connecting portion and the coupler shaft main body are concentric and have the same outer diameter, and a flange projecting in the lateral direction having a lower surface engaged with the upper surface of the base plate at the upper end of the coupler shaft main body, mounting structure of the base plate, characterized in that there is a connecting fitting of the coupler type and a rotation tool engagement portion provided in the upper portion of the coupler shaft body. The rotating tool engaging portion is a rotating tool engaging portion formed of a planar polygonal flange projecting in a lateral direction, or an inner peripheral surface for rotating tool engagement provided at an upper end portion of a coupler shaft body. A rotating tool engaging portion formed of a concave portion having a rotating tool engaging portion formed of a convex portion having an outer peripheral surface for rotating tool engagement provided at the upper end portion of the coupler shaft main body. The base plate mounting structure according to claim 1, wherein the base plate mounting structure is a moving tool engaging portion.