JP3030638U - Steel plate structure for seismic reinforcement of concrete piers - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] When a steel plate is attached to the outer peripheral surface of a concrete bridge pier via a mounting bolt and an adhesive, an anchor hole for driving an anchor for screwing the mounting bolt is shaved when drilling the pier. Provided is a steel plate structure for earthquake-proof reinforcement of a concrete pier, which can prevent dust such as dust from falling into the gap between the outer peripheral surface of the pier and the steel plate, and can improve the adhesive strength of the steel plate to the pier. SOLUTION: A steel plate 1 which is attached to the outer peripheral surface of a concrete pier 2 by screwing a large number of mounting bolts 5 and an adhesive 4 is provided with a large number of bolt holes 8 for inserting the mounting bolts 5, and the steel plate 1 A packing material 9 having elasticity is attached to the back surface of each bolt hole 8.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention is mainly intended to improve the earthquake resistance of an existing concrete pier, and when a steel plate for seismic reinforcement is attached to the outer peripheral surface of the pier by the steel plate winding construction method with a mounting bolt and an adhesive, screw the mounting bolt into the concrete pier. The present invention relates to a steel plate structure for seismic reinforcement of a concrete pier that can prevent concrete scraps and the like generated when drilling an anchor hole from dropping into the gap between the surface of the pier and the steel plate when driving an anchor.

[0002]

[Prior art]

 In recent years, when a large earthquake occurs in Japan, a large impact more than the originally designed value may be applied to concrete piers such as highways and railroad tracks, which may damage the piers and cause a major accident. found. Therefore, in order to increase the seismic strength of the existing concrete piers as mentioned above, the steel plate winding method is used to firmly join the steel plates to the outer peripheral surface of the piers.

In this method, a steel plate is attached to the outer peripheral surface of a concrete pier with a large number of mounting bolts and an adhesive agent. It is about 100 mm, and it is about 70 mm considering the distance from the outside of the reinforced steel bars to the surface of the pier concrete surface. The anchor drilling depth for screwing the mounting bolt is 70 mm or more at the reinforcing bar. Since it is impossible to construct the hole depth, it is necessary to drive an anchor bolt cone that can be constructed within the above drilling depth into the anchor hole and screw the mounting bolt into the female screw inside the anchor.

However, when drilling an anchor hole for attaching a steel plate to a concrete pier with a drill or the like, concrete scraps or the like during drilling are provided in a narrow gap between the steel plate to be attached and the surface of the concrete pier. There is a problem that the dust falls and is clogged in the gaps, and the adhesive strength of the resin and other adhesives injected into the gaps is weakened, and the prescribed strength for seismic reinforcement cannot be obtained.

[0007] Thus, the dust such as concrete shavings discharged when the anchor hole is drilled is conventionally treated by air blow or the like, but it is not possible to sufficiently remove the dust and the like dropped on the back surface of the steel plate. The current situation is that it cannot be done.

[0006]

[Problems to be solved by the device]

 The present invention, when the steel plate is screwed onto the outer peripheral surface of the concrete pier and is attached with an adhesive, an anchor hole for anchor driving for screwing the mounting bolt is drilled in the concrete pier. At times, dust such as scraps of concrete can be prevented from falling into the gap between the outer surface of the concrete pier and the steel plate, and the steel plate for earthquake-proof reinforcement of concrete piers can be improved to improve the resin bond strength of the steel plate to the pier surface. The problem to be solved is to provide a structure.

[0007]

[Means for Solving the Problems]

 The present invention provides a large number of bolt holes for inserting the mounting bolts on a steel plate to be mounted on the outer peripheral surface of a concrete bridge pier by screwing in a large number of mounting bolts and an adhesive such as resin, and It consists of a steel plate structure for earthquake-proof reinforcement of concrete piers, with urethane on the backside having elasticity and other packing materials attached with adhesive.

Further, the present invention comprises a steel plate structure for seismic reinforcement of a concrete pier in which an appropriate number of injection holes for injecting an adhesive are provided in a steel plate attached to the outer peripheral surface of the concrete pier.

[0009]

[Embodiment of device]

 An embodiment of the steel plate structure for earthquake-proof reinforcement of the present invention will be described below with reference to the drawings. The steel plate structure 11 is an outer peripheral surface of a concrete pier 2 such as a highway as shown in FIG. On the other hand, it is constructed by the steel plate winding method, and a perspective view of the plane cross section in the AA direction of FIG. 6 is shown in FIG. 1, and a plane cross section of FIG. 1 is shown in FIG. The steel plate 1 of the steel plate structure 11 is attached to the outer peripheral surface of the concrete pier 2 as shown in FIG. 3 which is an enlarged plan sectional view of an arrow B portion of FIG. It is attached via an adhesive 4 such as.

A large number of mounting bolts 5 such as countersunk bolts as shown in FIG. 3 are screwed into the steel plate 1 with respect to the outer surface of the pier 2 as shown in FIGS. 1 and 2. As shown in FIG. 3, the inside of the anchor hole 6 formed in the concrete pier 2 is formed into a cone shape, and the tip is opened into the anchor hole 6 by driving. The steel plate 1 is fastened to the outer peripheral surface of the pier 2 by screwing the male screw of the mounting bolt 5 into the female screw inside the tip of the anchor 7.

That is, the steel plate 1 of the steel plate structure 11 of the present invention is provided with bolt holes 8 for inserting a large number of mounting bolts 5 as shown in the enlarged front view of the main part of FIG. The anchor holes 6 are drilled on the outer peripheral surface of the concrete pier 2 from 8 by a drill or the like. The packing material is formed on the back surface of each of the bolt holes 8 as shown in FIGS. 3, 4 and 5. 9 is stuck.

The packing material 9 is formed of a material having elasticity, and in this embodiment, urethane or the like having excellent resin permeability of the adhesive 4 is used, and as shown in FIG. Adhesive 10 is attached to the steel plate 1, and the packing material 9 is attached to the back surface of each bolt hole 8 of the steel plate 1 in advance before the steel plate 1 is attached to the outer peripheral surface of the pier 2.

The packing material 9 is formed in a ring shape, the inner diameter D of which is slightly larger than the diameter of the anchor hole 6, and the thickness T is the gap between the outer peripheral surface of the pier 2 and the steel plate 1 to be wound. When it is set to about 4 mm, T = about 10 mm, and when the steel plate 1 is fastened to the pier 2 with the mounting bolts 5, the thickness T is appropriately compressed. Dust such as shavings when the anchor hole 6 is drilled on the concrete surface intrudes into the gap between the outer peripheral surface of the pier 2 and the steel plate 1 and shuts out from falling.

Further, the steel plate 1 is provided with an appropriate number of injection holes 12 for the adhesive 4 as shown in FIG. 5, and the resin adhesive 4 is provided in the gap between the outer peripheral surface of the pier 2 and the steel plate 1. It is desirable to provide as many injection holes 12 as possible so that the injection can be performed uniformly, and it is also preferable to attach a removable lid to each injection hole 12. Next, a description will be given of the procedure for winding the seismic reinforcing steel plate structure 11 of the present invention on the concrete pier 2 as shown in FIG. Then, lift it up and move it to the installation position of the pier 2, position it, and fix the position of the steel plate 1 using a reamer bolt or several bolts.

After that, on the concrete pier 2, the anchor holes 6 are drilled from the bolt holes 8 of the steel plate 1 by a drill or the like, and the anchors 7 are driven into the anchor holes 6. Next, the packing material 9 is compressed by inserting the mounting bolts 5 such as countersunk bolts from the surface of the steel plate 1 into the respective bolt holes 8 and tightening and fixing them to the anchors 7 with screws.

After that, a groove-finished portion of the edge of each steel plate is subjected to a very welding finish as shown by an arrow W in FIG. 1, and then a resin adhesive 4 is injected through an injection hole 12. Then, the steel plate 1 is firmly attached to the outer peripheral surface of the pier 2, and the outer surface is painted to complete the construction.

[0017]

[Effect of device]

 If the steel plate structure for earthquake-proof reinforcement of the present invention described above is applied to wind up the steel plate on the outer peripheral surface of the concrete pier, dust such as concrete scraps will be removed when the anchor hole is drilled in the concrete pier. Can be prevented from falling into the gap between the outer peripheral surface of the pier and the steel plate, so that the resin bond strength of the steel plate to the pier surface can be improved. As a result, existing concrete piers can be upgraded to structures with high seismic resistance.

[Brief description of drawings]

FIG. 1 is a perspective view showing a plane cross section taken along line AA of FIG. 6 in which a steel plate is attached to the outer peripheral surface of a concrete bridge pier.

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is an enlarged plan sectional view of a portion indicated by an arrow B in FIG.

FIG. 4 is an enlarged perspective view of the packing material of FIG.

5 is a front view showing an enlarged main part of the steel plate of FIG. 1. FIG.

FIG. 6 is a front view showing a partial cross-section in which the steel plate structure for earthquake-proof reinforcement of the present invention is applied to a concrete pier.

[Explanation of symbols]

1 Steel Plate 2 Bridge Pier 4 Adhesive 5 Mounting Bolt 8 Bolt Hole 9 Packing Material 11 Steel Plate Structure 12 Injection Hole

Claims (2)

[Scope of utility model registration request] 1. A steel plate to be attached to the outer peripheral surface of a concrete bridge pier by screwing a number of mounting bolts and bonding with an adhesive, and a plurality of bolt holes for inserting the mounting bolts are provided on the back surface of each bolt hole of the steel plate. A steel plate structure for seismic reinforcement of concrete piers, which is made by attaching elastic packing material. 2. A steel plate structure for seismic reinforcement of a concrete pier, wherein the steel plate according to claim 1 attached to the outer peripheral surface of the concrete pier is provided with an appropriate number of holes for injection of an adhesive.