JP5770398B1 - Attaching structure of pier edge widening bracket to pier and fixing method of pier edge widening bracket to pier - Google Patents

Abstract

A structure for fixing a bridge pier edge widening bracket to a pier and a bridge pier edge widening bracket that can eliminate the drilling work, significantly shorten the work time, and can firmly fix the pier edge widening bracket to the side of the pier. Provide a method for fixing to piers. A side of a reinforced concrete bridge pier is suspended so that one end of a fixing plate attached to a plurality of suspension spaces formed so as to exceed the internal rebar is located inside the internal rebar, and the other end is externally threaded And a fixing member 7 fixed by an inorganic or organic curing agent that is filled and cured in the suspension space, and a plurality of female screw holes for fixing a pier edge widening bracket fixed by the fixing member. A base plate 10 having a thickness, and a pier edge widening bracket 4 fixed to the base plate by a bolt 12 are provided. [Selection] Figure 7

Description

  The present invention relates to a structure for fixing a bridge edge widening bracket to a bridge pier and a method for fixing a bridge edge widening bracket to a bridge pier for jack-up when a bridge is exchanged.

  In the seismic reinforcement work for the upper structure of the bridge, a steel pier edge widening bracket is fixed to the side part of the reinforced concrete pier directly under the girder in order to install a jack-up jack to replace the bearing. As a method of fixing the pier edge widening bracket to the side of the pier side, conventionally, anchor bolts are embedded between the internal reinforcing bars of the pier, resin is injected, the pier edge widening bracket is attached, and then tightened with a nut. Yes. Furthermore, in order to increase the pull-out resistance of the anchor bolt, one in which the tip of the anchor bolt expands has been proposed.

  The hole for anchor bolt installation is drilled on the side of the reinforced concrete pier using a diamond drill. However, the reinforcing bars inside the pier are often not arranged at regular intervals as shown in the completed drawing, so when drilling the required length, it is inevitable that it will interfere with the reinforcing bars, and drilling is performed again. Therefore, a great deal of trouble is caused.

  In order to avoid interference with the internal reinforcement when drilling, in the fixing structure that fixes the pier edge widening bracket to the pier, the anchor bolt at the top step is driven into the internal reinforcement, and the embedded length of the second and lower bolts A structure has been proposed for fixing the bridge pier edge widening bracket to the pier as a drive-in anchor bolt set to a length that does not interfere with the reinforcing bars in the pier.

JP 2007-63882 A JP 2002-221916 A

  However, in the conventional structure for fixing the pier edge widening bracket to the pier, it is necessary to drill a large number of holes for anchor bolts, which requires a lot of work time for drilling work in a narrow work space. It has the problem of costly work.

  The present invention solves the problems of the prior art, eliminates the drilling work, significantly shortens the work time, and to the pier of the pier edge widening bracket capable of firmly fixing the pier edge widening bracket to the side of the pier. An object of the present invention is to provide a method for fixing the bridge pier edge widening bracket to the pier.

In order to solve the above-mentioned problem, the method of fixing the pier edge widening bracket of the present invention to the pier includes a step of forming a plurality of suspension spaces having a depth exceeding the internal rebar on the side surface of the reinforced concrete pier, A step of disposing a fixing member in which one end portion of the fixing plate attached to the suspension space is positioned inside the internal reinforcing bar and a male screw portion is formed on the other end portion; and a mold frame is supported by the fixing member , and the plurality of suspensions a step of inorganic or organic hardening agent was filled by hardened demolding after curing to fix the fixing member in the space, the base plate of predetermined thickness having a plurality of piers edge widening bracket female screw hole by the fixing member And a step of fixing an abutment edge widening bracket to the base plate with a fixing bolt.

  Further, the fixing method of the pier edge widening bracket of the present invention to the pier is that the strength after curing of the inorganic or organic curing agent filled and cured in the plurality of suspension spaces is equal to the strength of the surrounding concrete. It is characterized by the above.

A step of forming a plurality of suspension spaces having a depth exceeding the internal rebar on the side surface of the reinforced concrete pier, and one end portion where the fixing plate is attached to the plurality of suspension spaces are positioned inside the internal rebar, and a male screw portion at the other end portion disposing a fixing member formed with the formwork is supported by the fixing member, fixing the fixing member to demolding after curing cured filled with inorganic or organic hardening agent in the plurality of chipping spaces A step of fixing a base plate having a predetermined thickness in which a plurality of female screw holes for a pier edge widening bracket are formed by the fixing member, and a step of fixing the pier edge widening bracket to the base plate by a fixing bolt. Therefore, the drilling work is eliminated, the suspension work is performed at a plurality of places, and the base plate that supports the pier edge widening bracket is fixed by the fixing member. It is possible bets to shorten considerably the possibility and will work time.
By fixing the strength of the inorganic or organic curing agent that fills and suspends the plurality of suspension spaces to be equal to or greater than the strength of the surrounding concrete, it is possible to widen the pier edge by firmly fixing the fixing member. It is possible to withstand a large load applied to the bracket.

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  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are views showing a first step and a second step of a method for fixing a pier edge widening bracket to a pier.

  On the bridge pier 1 made of reinforced concrete, a girder 2 as an upper structure is supported via a support 3. When replacing the bearing 3, it is necessary to jack up the girder 2. The bridge edge widening bracket 4 is fixed to the side surface of the pier 1 at a position directly below the girder 2 in order to install a jack for jacking up and widen the edge of the place where the girder length is insufficient.

  In the first step of the method of fixing the pier edge widening bracket 4 to the pier 1, the suspension work is performed on the side surface of the pier 1 beyond the internal rebar 5 to form a plurality of suspension spaces 6. The size of the suspension space 6 is set to a depth at which the internal rebar 5 is exposed larger than the interval between the vertical bars 5a and 5a of the internal rebar 5 and the interval between the horizontal bars 5b and 5b.

  In the second step of the method for fixing the pier edge widening bracket 4 to the pier 1, the fixing members 7 are arranged in the plurality of suspension spaces 6. The outer diameter of the fixing member 7 is set smaller than the interval between the vertical bars 5a and 5a and the interval between the horizontal bars 5b and 5b. One end of the fixing member 7 is positioned inside the internal reinforcing bar 5, and a fixing plate 8 larger than the outer diameter of the fixing member 7 is attached to one end of the fixing member 7.

  The other end of the fixing member 7 protrudes from the side surface of the pier 1. A male screw portion 7 a is formed at the other end portion of the fixing member 7. The fixing member 7 is formed of a steel material having an outer diameter larger than that of a normal anchor bolt and having a higher strength. By forming the fixing member 7 with a large diameter and a high-strength material, the number of the fixing members 7 for supporting and fixing the base plate 10 can be reduced.

  3 and 4 are views showing a third step of the method for fixing the pier edge widening bracket 4 to the pier 1. The third step of the method for fixing the pier edge widening bracket 4 to the pier 1 is to fill the suspension space 6 with an inorganic curing agent such as uncured concrete or an organic curing agent such as epoxy resin, and to cure. 7 is fixed in the hanging space 6. When the uncured inorganic curing agent or organic curing agent is filled, the mold 9 is supported by the plurality of fixing members 7. By supporting the mold 9 with the fixing member 7, the fixing member 7 can be positioned at an accurate position in the suspension space 6.

  After the uncured inorganic curing agent or organic curing agent is cured, the mold 9 is removed. The strength of the inorganic curing agent or organic curing agent after curing is set to be equal to or higher than the strength of surrounding concrete. The fixing member 7 can be firmly fixed by increasing the strength of the inorganic curing agent or organic curing agent after curing, and can withstand a large load applied to the bridge pier edge widening bracket. It becomes.

  5 and 6 are views showing a fourth step of the fixing method of the pier edge widening bracket 4 to the pier 1. In the fourth step of the method for fixing the pier edge widening bracket 4 to the pier, the organic curing agent such as an inorganic curing agent or epoxy resin filled in the suspension space 6 is cured and the fixing member 7 is fixed. A base plate 10 having a predetermined thickness in which a fixing member insertion hole is formed is inserted into the fixing member 7, and a nut 11 is screwed onto a male screw portion 7 a at the other end of the fixing member 7 to fix the base plate 10 to the side surface of the pier 1. .

  A plurality of bridge edge widening bracket fixing female screw holes 10 a are formed in the base plate 10. The thickness of the base plate 10 is set to withstand the load applied to the bridge edge widening bracket 4.

  7 and 8 are views showing a fifth step of the method for fixing the pier edge widening bracket 4 to the pier 1. In the fifth step of the method for fixing the pier edge widening bracket 4 to the pier, the fixing bolt 11 is screwed into the female screw hole 10a for fixing the bridge edge widening bracket formed in the base plate 10 to attach the bridge pier edge widening bracket 4 to the base plate. 10 is fixed.

  As described above, according to the fixing structure of the pier edge widening bracket to the pier and the fixing method of the pier edge widening bracket to the pier 1 according to the present invention, the drilling work is eliminated and the suspension work is performed at a plurality of locations. The base plate that supports the bridge pier edge widening bracket can be fixed by the fixing member, and the working time can be remarkably shortened.

  1: bridge pier, 2: girder, 3: support, 4: bridge edge widening bracket, 5: internal reinforcing bar, 5a: vertical bar, 5b: horizontal bar, 6: suspension space, 7: fixing member, 7a: male screw part, 8 : Fixing plate, 9: Formwork, 10: Base plate, 10a: Female screw hole for fixing the bridge edge widening bracket, 11: Nut, 12: Fixing bolt

Claims (2)

Forming a plurality of suspension spaces with a depth exceeding the internal rebar on the side of the reinforced concrete pier;
A step of arranging a fixing member in which one end portion of the plurality of suspension spaces attached to the fixing plate is located inside the internal reinforcing bar and a male screw portion is formed at the other end portion;
The formwork is supported by the fixing member, and fixing the fixing member to demolding after curing cured filled with inorganic or organic hardening agent in the plurality of chipping space,
Fixing a base plate having a predetermined thickness in which a plurality of female screw holes for a bridge pier edge widening bracket are formed by the fixing member;
Fixing the pier edge widening bracket to the base plate with a fixing bolt;
A method for fixing a pier edge widening bracket to a pier, characterized by comprising:   2. The pier edge widening according to claim 1, wherein the strength after curing of the inorganic or organic curing agent filled and cured in the plurality of suspension spaces is equal to or greater than the strength of surrounding concrete. Fixing method to bracket pier.

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