JP2011168970A - Reinforcing structure and reinforcing method of intermediate restricting reinforcement for reinforcing bridge pier against earthquake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily dispose intermediate restricting reinforcements according to the shape of the side surfaces of an existing skeleton. <P>SOLUTION: This reinforcing structure of a bridge pier 1 is constructed by restraining band reinforcements 4 horizontally disposed on the existing skeleton 120 by the intermediate restraining reinforcements 5 inserted into drilled holes 12A horizontally extending through the existing skeleton 120, and placing a polymer cement mortar 6 around the outer surfaces of the intermediate restraining reinforcements 5, the band reinforcements 4, and the existing skeleton 120. The intermediate restraining reinforcement 5 is formed by vertically bending both ends of a set of upper and lower reinforcements 51, 52 which are inserted into the drilled holes 12A and which extend through the existing skeleton 120 and connecting the ends (side parts 51a, 51b, 52a, 52b) of the both reinforcements 51, 52 to each other at the bent vertical portions. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a reinforcing structure for a casing in which a band reinforcing bar arranged in the casing is constrained by an intermediate constraining bar penetrating the casing and a mortar is wound around the outer surface of the casing.

  In the reinforcing method described in Patent Document 1 below, a pair of L-shaped rebars made of steel bars are inserted through through holes that are open side by side on the side of the housing, and then the rebars are connected by welding. By doing so, an intermediate constraining bar with a square ring shape is formed through both through-holes, and the intermediate constraining bar is placed in the existing frame so that the band reinforcing bar and the vertical bar are sandwiched between the existing frame. The mortar is wound around the outer surface of the housing.

  In this method, when the existing frame is a bridge pier with no taper on the outer surface, one side of a pair of L-shaped reinforcing bars that form a pair is changed from one side to the upper through hole. The other side is inserted into the lower through-hole from the other side, and the tip of the other side bent in the same direction as the one side is inserted into the upper or lower through-hole. An intermediate constraining bar is formed at the tip of one side by welding in the through hole.

  When the existing frame is a bridge pier with a taper on the outer surface, one side of one of the pair of L-shaped reinforcing bars forming a set is changed from one side to the upper through hole, and the other side. Is inserted into the through hole on the lower side from the other side surface, and then one end of a separately prepared linear reinforcing bar is welded to the tip of one side of each reinforcing bar in the through hole. Subsequently, the outer surface of the linear reinforcing bar connected to the other reinforcing bar is welded to the outer surface of the other side of the L-shaped reinforcing bar, and the L-shaped reinforcing bars are connected to each other via the linear reinforcing bar. Are connected to form an intermediate restraint.

JP 2008-215056 A

  In the reinforcing method described in Patent Document 1, it is necessary to prepare reinforcing bars having different shapes according to the shape of the side surface of the existing housing such as the presence or absence of a taper and the angle of the taper, and to change the connection method between the reinforcing bars. Further, in order to weld and connect the ends of the reinforcing bars within the through hole, it is necessary to provide an enlarged diameter portion at one end of the through hole. For this reason, it took time and effort to arrange the intermediate restraint bars.

  This invention is made | formed in view of such a condition, and it aims at providing the reinforcement structure and reinforcement method which can solve the said subject.

In order to achieve such an object, the reinforcing structure of the present invention includes a bar rebar arranged in a horizontal direction of a frame, and an intermediate constraint that passes through the frame in the horizontal direction and constrains the band rebar to the frame. A reinforcing structure that reinforces the case with a reinforcing bar, the intermediate restraint bar, the band reinforcing bar, and a mortar wound around the outer surface of the case. Both ends of the pair of reinforcing bars are bent in the vertical direction, and the both ends are connected to each other in the vertical portion, and the mortar is a polymer cement mortar.
Further, the present invention is characterized in that the both end portions are connected by flare welding.
Further, the present invention is characterized in that the polymer cement mortar is wound around the casing with a cover amount having the same thickness as the outer diameter of the intermediate restraint bar on the outside of the intermediate restraint bar.
The present invention is characterized in that the housing is a pier.
Further, the reinforcing method of the present invention is a reinforcing method for a housing, the step of arranging a reinforcing bar in the horizontal direction of the housing, the step of drilling a through-hole penetrating the housing in the horizontal direction, A step of inserting an intermediate constraining bar into the through hole and bending both ends; a step of connecting the two end parts adjacent in the vertical direction at a vertical portion; the intermediate constraining bar, the band reinforcing bar, and the outer surface of the housing And a step of placing polymer cement mortar, and the both end portions are not connected at a horizontal portion.

  According to the present invention, the pair of reinforcing bars penetrating the casing is bent in the vertical direction along the outer surface of the casing, and the bent vertical portions are connected to form the intermediate restraint bars. It becomes possible to easily arrange the intermediate restraint bars according to the shape.

It is a front view which shows the pier provided with the reinforcement structure of one Embodiment of this invention. It is a side view which shows the pier of FIG. It is AA arrow sectional drawing of the pier of FIG. It is the fragmentary sectional view which looked at the pier of FIG. 1 from back. It is sectional drawing which expands and shows FIG. 4 partially. It is a 1st figure which shows an example of the bar arrangement method of the intermediate | middle restraint bar shown in FIG. It is a 2nd figure which shows an example of the bar arrangement method of the intermediate | middle restraint bar shown in FIG. It is a 3rd figure which shows an example of the bar arrangement method of the intermediate | middle restraint bar shown in FIG. It is a 4th figure which shows an example of the bar arrangement method of the intermediate | middle restraint bar shown in FIG.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a pier 1 of the present embodiment. FIG. 2 is a side view showing the pier 1. FIG. 3 is a cross-sectional view of the pier 1 taken along the line AA.

  The pier 1 shown in FIGS. 1 to 3 includes a footing 11 fixed to the ground with a pile 14, and a leg portion 12 extending upward from the footing 11 and provided with a support portion 13 at an upper end. Support the bridge girder on the top. The leg portion 12 is wound around the existing leg portion 120 (see FIG. 3) with the thickening reinforcement portion 21 on the outer surface from the center portion in the vertical direction to the upper end portion, and the fixing portion protection portion 22 on the lower outer surface. It is reinforced.

  A plurality of drilling holes 12 </ b> A are formed in the lower part of the existing leg part 120 covered with the fixing part protection part 22. The drilling hole 12A penetrates between both side surfaces of the existing leg 120 in the horizontal direction. On both side surfaces of the existing leg portion 120, a plurality of pairs of drilling holes 12A are formed along the top and bottom and the front-rear direction. In the example shown in FIGS. 1 to 3, three sets of drilling holes 12 </ b> A arranged in the vertical direction and two sets of drilling holes 12 </ b> A arranged in the vertical direction are alternately arranged in the front-rear direction on both side surfaces of the existing leg 120. Openings are arranged side by side, and two sets of each drilling hole 12A are arranged between three sets of each drilling hole 12A.

  As shown in FIG. 4, the outer surface from the upper end to the lower end of the leg portion 12 where the thickening reinforcement portion 21 and the fixing portion protection portion 22 are formed extends in the vertical direction along the outer surface of the existing leg portion 120. The axial rebar 3 and the band rebar 4 extending in the circumferential direction of the existing leg 120 along the outer surface of the existing leg 120 are arranged. Further, an intermediate restraint bar 5 is inserted through a pair of each drilling hole 12A that is paired vertically.

  A mortar 6 in which the axial reinforcing bar 3 and the band reinforcing bar 4 are wound around the thickened reinforcing part 21, and the axial reinforcing bar 3, the band reinforcing bar 4 and the intermediate restraining bar 5 are wound around the existing leg part 120 in the fixing part protecting part 22. Embedded in the leg 12 and integrated with the leg 12. The winding thickness of the polymer cement mortar 6 at the fixing unit protection unit 22 is equal to the nominal diameter (outer diameter) of the axial reinforcing bar 3, the strip reinforcing bar 4, and the intermediate constraining bar 5, and the nominal diameter (outer diameter) of the intermediate constraining bar 5 ) Is the total thickness of the same amount of fog. That is, the polymer cement mortar 6 is wound around the existing leg 120 with a cover amount having the same thickness as the outer diameter of the intermediate restraint bar 5 on the outside of the intermediate restraint bar 5.

  The axial rebar 3 extends linearly from the upper end to the lower end of the existing leg 120, and a plurality of axial rebars 3 are provided along the circumferential direction of the existing leg 120 with a space between the adjacent axial rebar 3. ing. The band reinforcing bar 4 has an annular shape extending in the horizontal direction along the outer surface of the existing leg 120, and a plurality of band reinforcing bars 4 are arranged along the vertical direction of the existing leg 120 with a space between the adjacent band reinforcing bars 4. Is provided. Further, the intermediate restraint bar 5 has a square ring shape that penetrates the existing leg 120 in the horizontal direction through a pair of drilling holes 12A and extends between the two drilling holes 12A along both side surfaces of the existing leg 120. ing.

  Each axial reinforcing bar 3 is fixed to the footing 11 by the anchor fixing portion 30 as shown in FIG. 4 and fixed to the outer surface of the existing leg portion 120 by the fixing member 31 as shown in FIG. The fixing member 31 includes a fixing band 31 </ b> A that accommodates the axial rebar 3, and an anchor bolt 31 </ b> B that fixes the fixing band 31 </ b> A to the existing leg 120, and a drilling hole formed on a side surface of the existing leg 120. It is fixed by filling with a solidifying material such as grout, or by an expanded bottom fixing method by driving a wedge. Each strip reinforcing bar 4 is assembled in an annular shape by connecting the reinforcing bars to each other by flare welding outside the axial reinforcing bar 3, and is fixed to the axial reinforcing bar 3 by a binding wire at a location intersecting the axial reinforcing bar 3. .

  Further, the intermediate restraint bar 5 extends in the vertical direction along both side surfaces of the existing leg 120 so as to sandwich the axial reinforcing bar 3 and the band reinforcing bar 4 with the side surface of the existing leg 120. As shown in FIG. 4, each intermediate restraint bar 5 restrains three belt reinforcing bars 4 adjacent to each other in the vertical direction on the outer surface of the existing leg part 120 to the leg part 12. The reinforcing bar 3 and the belt reinforcing bar 4 are prevented from expanding in the out-of-plane direction.

  Next, an example of a construction method of the thickening reinforcing portion 21 and the fixing portion protecting portion 22 that reinforces the pier 1 will be described with reference to FIGS. In this example, the axial rebar 3 and the band rebar 4 are arranged on the existing leg 120, the drilling hole 12 </ b> A penetrating the existing leg 120 in the horizontal direction is drilled, and then the intermediate restraint to the existing leg 120 is performed. The streak 5 is fixed.

  In the fixing operation of the intermediate restraint bar 5, first, as shown in FIG. 6, one side 51a of the reinforcing bar 51 bent in advance in an L shape is inserted into the hole 12A (hole 12A1) from one side. insert. Next, as shown in FIG. 7, the other side 51b of the reinforcing bar 51 located on one side of the existing leg 120 is placed on the side of the drilling hole 12A (cutting hole 12A2) adjacent to the lower side of the drilling hole 12A1. In this state, the one side 51a protruding from the opening on the other side of the hole 12A1 is bent toward the hole 12A2. Thereby, the rebar 51 inserted through the hole 12A1 is in a state of a U shape with the tip of the one side 51a and the rebar 51b facing the hole 12A2.

  Subsequently, as shown in FIG. 8, one side 52a of the intermediate restraint bar 52 bent in advance in an L shape is inserted into the drilling hole 12A2 from one side, and the other side 52b is inserted into the drilling 12A1 side. 9, the one side portion 52a protruding from the opening on the other side of the hole 12A2 is bent toward the hole 12A1 as shown in FIG. Thereby, the reinforcing bar 52 inserted into the drilling hole 12A2 is in a state of a U shape with the tip of the one side 52a and the reinforcing bar 52b facing the drilling hole 12A1, and the reinforcing bar 51 inserted through the drilling hole 12A1. It will be in the state which exhibited the square ring.

  Subsequently, the other side 51b of the reinforcing bar 51 extending downward along one side surface of the existing leg 120 from the drilling hole 12A1, and the reinforcing bar 52 extending upward along one side surface of the existing leg 120 from the drilling hole 12A2. The other side 52b is connected to the outer peripheral surface by welding such as flare welding, and one side 51a of the reinforcing bar 51 extending downward along the other side of the existing leg 120 from the hole 12A1 and the other side from the hole 12A2. One side portion 52a of the reinforcing bar 52 extending upward along the other side surface of the leg portion 120 is connected to the outer peripheral surface by welding such as flare welding. In this way, after the intermediate constraining bar 5 is arranged on the existing leg part 120, the polymer cement mortar 6 is placed, whereby the thickening reinforcing part 21 and the fixing part protecting part 22 are constructed.

  According to the present embodiment, the end portions (side portions 51a, 51b, 52a, 52b) of the reinforcing bars 51, 52 inserted through the drilling hole 12A are bent in the vertical direction along the side surfaces of the existing leg portions 120, and bent. Since the intermediate constraining bars 5 are formed by connecting the vertical parts (side parts 51a, 51b, 52a, 52b) to each other, the reinforcing bars according to the side shape of the existing housing 120 such as the presence or absence of the taper and the taper angle. By bending 51 and 52, the intermediate constraining muscle 5 can be formed in accordance with the side surface shape of the existing casing 120. Moreover, since the side parts 51a, 51b, 52a, 52b of the reinforcing bars 51, 52 extending along the side surfaces of the existing casing 120 are connected to each other, the connecting work of the reinforcing bars 51, 52 can be easily performed. For this reason, it is possible to easily perform the bar arrangement work of the intermediate restraint bars 5.

  In the above embodiment, the case where the reinforcing bars 51 and 52 constituting the intermediate constraining bar 5 are bent in an L shape in advance has been described, but the reinforcing bars 51 and 52 are formed in an L shape after being inserted into the drilling hole 12A. The sides 51b and 52b may be formed by bending. Moreover, although the said embodiment demonstrated the case where all the reinforcing bars 51 and 52 were inserted in the drilling hole 12A from the one side of the leg part 12, the direction which inserts the reinforcing bars 51 and 52 in the drilling hole 12A is arbitrary. It is.

  In the above-described embodiment, the case where the three reinforcing bars 4 are constrained by each of the intermediate constraining bars 5 has been described. That's all. Moreover, although the said embodiment demonstrated the case where each belt reinforcement 4 was restrained by the four or five intermediate restraint bars 5, the number of the intermediate restraint bars 5 which restrain the belt reinforcement 4 is arbitrary.

  In the above-described embodiment, the case where the hole 12A is drilled in the existing leg 120 after the axial rebar 3 and the strip reinforcing bar 4 are arranged has been described. However, the hole 12A is cut in the existing leg 120. After the hole is formed, the reinforcing bars 3 and the reinforcing bars 4 may be arranged. Moreover, the connection method of the reinforcing bars 51 and 52 is not limited to flare welding, and other welding methods and mechanical connection methods can also be used.

  Moreover, the method of placing polymer cement mortar is arbitrary, and for example, it can be placed by plastering, spraying, or form filling. The reinforcing structure of the present invention can be applied to a reinforcing structure in a seismic reinforcing method for bridge piers installed at any place in water or on land. Moreover, the number of the band reinforcement 4 restrained to the existing leg part 120 by each intermediate | middle restraint reinforcement 5 is arbitrary, and is not limited to three.

1 Pier 11 Footing 12 Leg 120 Existing Leg 12A Drilling Hole (Through Hole)
13 Supporting part 14 Pile 21 Thickening reinforcement part 22 Fixing part protection part 3 Axial reinforcing bar 30 Anchor fixing part 31 Fixing member 31A Fixing band 31B Anchor bolt 4 Reinforcing bar 5 Intermediate restraint bars 51, 52 Reinforcing bars 51a, 52a Bending part ( Edge, vertical part)
51b, 52b Bent part (end part, vertical part)
6 Polymer cement mortar

Claims (5)

A band reinforcing bar arranged in the horizontal direction of the frame, an intermediate binding bar that passes through the frame in the horizontal direction and binds the band reinforcing bar to the frame, the intermediate binding bar, the band reinforcing bar, and an outer surface of the frame A reinforcing structure that reinforces the housing with a mortar wound around,
The intermediate restraint bars are configured such that both ends of a pair of upper and lower reinforcing bars penetrating the housing are bent in the vertical direction, and the both ends are connected in a vertical portion,
The reinforcing structure is characterized in that the mortar is a polymer cement mortar.   The reinforcing structure according to claim 1, wherein the both end portions are connected by flare welding.   The polymer cement mortar is wound around the casing with a cover amount having the same thickness as the outer diameter of the intermediate constraining bar on the outside of the intermediate constraining bar. Reinforcement structure.   The reinforcing structure according to claim 1, wherein the frame is a pier. A method of reinforcing the housing,
Arranging the reinforcing bars in the horizontal direction of the housing;
Drilling a through-hole penetrating in a horizontal direction in the housing;
Inserting an intermediate restraint into the through hole and bending both ends;
Connecting both ends adjacent in the vertical direction in a vertical portion;
A step of placing polymer cement mortar on the outer side surface of the intermediate restraint bar, the band reinforcing bar and the frame, and the both end portions are not connected at a horizontal portion.

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