JPH108422A - Reinforcement structure of bridge pier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure, by which the welding work amount in a field can be reduced so as to improve the construction efficiency. SOLUTION: A steel inner reinforcement structure 57 is provided on the lower end part 53b of a post 53 of an existing bridge pier 51, and plural first studs 63 are planted on the outer surface of the inner reinforcement structure 57. An outer reinforcement structure 65 where plural second studs 64 are previously planted is provided outside the inner reinforcement structure 57. A space 77 between the inner reinforcement structure 57 and the outer reinforcement structure 65 is filled with heating concrete 75 and the concrete is hardened to fix the first and second studs 63, 64, thereby integrating the inner reinforcement structure 57 and the outer reinforcement structure 65 with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pier reinforcement structure which can be suitably implemented to reinforce the lower end of a column of an existing pier and to improve the connection strength between the column and the footing.

[0002]

2. Description of the Related Art FIG. 15 is a sectional view of an existing pier 1 showing a typical conventional technique. In the existing pier 1, a pillar 4 is erected on a footing 3 supported by a plurality of foundation piles 2,
A beam 6 for supporting a plurality of main girders 5 is provided on the upper part of the column 4, and a floor slab 7 is laid on each main girder 5. The footing 3, the column 4, and the beam 6 are a reinforced concrete structure and are integrally formed. In the footing 3, a plurality of anchor bolts 8 are fixed to an anchor frame 16 embedded in the footing 3, and each anchor bolt 8 is
Are circumferentially spaced apart from each other in the circumferential direction, and project upward from the footing 3. At least the lower end of the pillar 4 has a rectangular cross section perpendicular to the plane of the paper of FIG. 15 and has a structure in which concrete is filled in an outer frame 9 made of steel. A bracket 13 in which the webs 10 and 11 are connected by a plurality of webs 12 is fixed by welding. The anchor bolts 8 are respectively arranged between the webs 12 through the flanges 10 and 11, and a nut 14 is screwed to an upper end portion of the anchor bolt 8 projecting upward from the upper flange 10. Thus, the lower end of the pillar 4 is reinforced, and the existing pier 1 is configured.

[0003] The base portion 15 includes an upper and lower flange 1.
0, 11, an anchor bolt 8, a plurality of webs 12, and an outer frame 9. The periphery of the base portion 15 is covered with a root concrete 20.

FIG. 16 is an enlarged sectional view of the lower end portion of the column 4 of FIG. 15, and FIG. 17 is a sectional line XVII-XVI of FIG.
It is the expanded sectional view seen from I.

The upper reinforcing base plate 25 and the lower reinforcing base plate 26 are composed of an upper flange 10 and a lower flange 11.
Are fixed by welding. From the upper reinforcing base plate 25 to the lower reinforcing base plate 26, the reinforcing ribs 27 are formed by the upper reinforcing base plate 25, the lower reinforcing base plate 26, and a part 28 of the upper flange 10.
a, a plurality of fixing portions 28b of the lower flange 11 and an end face 29 of each web 12 are fixed by welding. On the upper surfaces of the upper base plate 13 and the upper reinforcing base plate 25, trapezoidal reinforcing ribs 30 are fixed to the side surface 31a of the outer plate 9, the upper surface 31b of the upper flange 10, and the upper surface 31c of the upper reinforcing base plate 25 by welding.

Further, the upper reinforcing base plate 25 and the lower reinforcing base plate 26 are provided with a plurality of insertion holes 33a and 33b, respectively, into which the trailing anchor bolts 32 are inserted. A post-anchor anchor bolt is inserted into each of the insertion holes 33a and 33b, and a nut 34 is screwed above the upper reinforcing base plate 25 to reinforce the lower end of the column 4.

[0007]

In the conventional reinforcing structure,
The reinforcing structure including the upper reinforcing base plate 25, the lower reinforcing base plate 26, the rectangular reinforcing ribs 27, the trapezoidal reinforcing ribs 30, the post-anchored anchor bolts 32, and the nuts 34 is provided on the site to one base portion. Therefore, a plurality of the reinforcing structures are to be welded, so that there are many welding spots on site, and the construction efficiency is poor. Also, at the site, when performing reinforcement work while allowing vehicles such as automobiles to pass on the upper structure, the load acting on the pier fluctuates constantly, with which the pier vibrates slightly and performs reliable welding. Therefore, it takes time and the workability is poor. Further, since the mechanical strength of the welded portion is reduced by heat at the time of welding, it is desirable that such a welded portion be small.
Furthermore, since a welding residual stress is generated in the welded portion, the residual stress reduces the allowable stress of the welded portion.

When a load is applied to the existing pier 1 in the direction of the bridge axis perpendicular to the plane of FIG. 15 and in the transverse direction perpendicular to the direction of the bridge axis, a moment is generated in the pier 1.
On the existing pier 1, a lateral load P _H perpendicular to the bridge axis and rightward
15 acts on the anchor bolt 8 and the post-anchor bolt 32 on the left side of the bridge shaft in FIG.
A compression force is generated in the anchor bolts 8 and the post-anchor anchor bolts 32 on the right side of the bridge shaft. The tensile force and the compressive force generate a shearing force on the weld and cause problems in the strength of the weld due to the above factors.

An object of the present invention is to provide a pier reinforcement structure capable of improving workability by reducing welding work on site.

[0010]

According to the present invention, a pillar is integrally formed on a reinforced concrete footing buried in the ground, and a beam for supporting an upper structure is integrally formed on an upper portion of the pillar. In a reinforcing structure for a bridge pier, a steel inner reinforcing structure is provided at least at a lower end portion of the pillar, and the inner reinforcing structure has a plurality of first studs protruding outwardly spaced from each other. An outer reinforcing structure, which is implanted at an interval and is externally implanted with a plurality of second studs pre-planted at an interval in a direction perpendicular to the axis substantially in parallel with each of the first studs, on the outer side of the inner reinforcing structure. A space is provided in a state supported on the upper surface of the footing, and a space in which the first and second studs are arranged is formed between the inner reinforcing structure and the outer reinforcing structure. Bridge characterized by filling and curing It is the reinforcement structure. According to the present invention, at a site, a filler is filled in a space between an inner reinforcing structure in which a plurality of first studs are implanted and an outer reinforcing structure in which a plurality of second studs are implanted in advance. The first stud and the second stud are fixed to the filler by hardening, and the inner reinforcing structure and the outer reinforcing structure are integrated, so that the lower end of the column is reinforced and the column and the footing are fixed. The connection strength can be improved.
In this way, welding work at the construction site can be reduced, and the workability can be improved.

Further, the present invention is characterized in that the outer reinforcing structure and the footing are connected by connecting means. According to the present invention, the outer reinforcing structure and the footing are connected by the connecting means, whereby the inner reinforcing structure and the outer reinforcing structure provided on both the tension side and the compression side of the column resist the moment. This allows the load to be shared and applied to the inner reinforcing structure and the outer reinforcing structure, and thus both the inner reinforcing structure and the outer reinforcing structure can simultaneously bear the load. Therefore, the construction of the inner reinforcing structure and the outer reinforcing structure, in particular, the number and diameter of the first and second studs can be reduced, and the construction cost can be reduced.

[0012]

FIG. 1 is a sectional view taken along a plane perpendicular to a bridge shaft 76 showing a reinforcing structure of an existing pier 51 according to an embodiment of the present invention, and FIG. It is an expanded sectional view of.

In the existing pier 51, a column 53 is erected on a footing 52 supported by a plurality of foundation piles 55, and a beam 5 supporting a plurality of main girders 59 is provided on an upper portion 53a of the column 53.
4 and a concrete floor slab 60 is provided on each main girder 59.
Is laid. The footing 52, the pillar 53 and the beam 5
Reference numeral 4 denotes a reinforced concrete structure which is integrally formed. In the footing 52, a plurality of anchor bolts 58 are fixed to an anchor frame 56 embedded in the footing 52, and the anchor bolts 58 are circumferentially spaced from each other so as to surround the column 53, It protrudes upward from the footing 52.

An inner reinforcing structure 57 made of steel is provided at the lower end 53b of the column 53. The inner reinforcing structure 57 includes:
A base plate 80 provided on the upper surface of the footing 52 and having a plurality of insertion holes 81 through which upper ends of the plurality of anchor bolts 58 are inserted, and a base plate 80 provided on a surface of a predetermined region of a lower end 53b of the column 53 Reinforcement plate 82
And a plurality of insertion holes 83 that are provided perpendicularly to the inner reinforcing plate 82 on the outer side of the inner reinforcing plate 82 at a distance from the base plate 80 and through which the upper ends of the anchor bolts 58 are inserted. A support plate 62 and the inner reinforcing plate 8 extending from the base plate 80 to the support plate 62.
2 and a plurality of ribs 84 provided circumferentially at intervals from each other.

The upper ends of the anchor bolts 58 are inserted through the respective insertion holes 81 and 83, and a washer 85 is mounted above the support plate 62, a nut 86 is screwed, and the footing 52 and the inner The reinforcing structure 57 is fixed.

On the outer surface of the inner reinforcing plate 82 above the support plate 62, a plurality of first studs 63 are implanted by stud welding, and outside the plurality of first studs 63, A plurality of second studs 64 spaced apart from the first stud 63 in the vertical and horizontal directions
Is an external reinforcing structure 6 having a substantially L-shaped cross-section and implanted in advance.
5 is provided in a state supported by the upper surface of the footing 52.

The outer reinforcing structure 65 is supported on the upper surface of the footing 52 and has a reinforcing anchor bolt 69 described later.
Support plate 66 in which an insertion hole 70 through which the shaft portion is inserted is formed.
An outer reinforcing plate 67 provided at a right angle to one side of the upper surface of the supporting plate 66 on the inner reinforcing structure 57 side, and a plurality of trapezoidal shapes welded to the supporting plate 66 and the outer reinforcing plate 67. It is constituted by ribs 68 and reinforcing anchor bolts 69 as connecting means for connecting the supporting plate 66 and the footing.

The shaft of the reinforcing anchor bolt 69 is inserted into the insertion hole 70, and the reinforcing anchor bolt 69
A washer 71 is attached from the upper end to the nut, and a nut 72 is screwed into the outer reinforcing structure 65 and the footing 52.
Are linked.

The space 77 between the inner reinforcing structure 57 and the outer reinforcing structure 65 is filled with an infill concrete 75, cured for a certain period of time, and hardened, thereby forming the first and second studs 63. , 64 are fixed, the inner reinforcing structure 57 and the outer reinforcing structure 65 are integrated, and the column 5
3 and the outer reinforcement structure 65 are reinforced, and the connection strength between the column 53 and the footing 52 can be improved.

Referring to FIG. 1, footing 52 is a reinforced concrete structure, and an example of dimensions for grasping the size is as follows: width B in a direction perpendicular to bridge axis 76 (left-right direction in FIG. 1). Is, for example, about 6 m, and the height H is, for example, about 2 m. The pillar 53 has a rectangular cross-sectional shape when cut perpendicularly to the plane of FIG.
The width h in the direction is, for example, about 2 m, the width b in the direction perpendicular to the bridge axis 76 is, for example, about 1 m, and the length L of the column 53 is, for example, about 5 m. The foundation pile 55 is, for example, P
It is a C pile.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 2, and FIG. 4 is a sectional view taken along line IV-III of FIG.
It is the expanded sectional view seen from IV. The inner reinforcing structure 57
And the outer reinforcing structure 65 is composed of four structural parts, and the inner reinforcing structure 57 is
The outer reinforcement structure 65 is constituted by first to fourth outer structures 74a, 74b, 74c, 74d.

On the outer surface of the first inner structure 73a, a plurality of first studs 63 are implanted at intervals. The remaining second to fourth inner structures 73b, 73c, 73d
Also has a configuration similar to that of the first internal structure 73a.

The first outer structure 74a includes the support plate 6
The outer reinforcing plate 67 is provided on the upper surface of the
Are provided at intervals from each other. Each of the ribs 68
A plurality of the insertion holes 70 are provided between them, and the shaft portions of the plurality of reinforcement anchor bolts 69 are inserted into the respective insertion holes 70, and a washer 71 is attached to the upper end of each reinforcement anchor bolt 69. Then, the nut 72 is screwed. The plurality of second studs 64 are implanted on the surface of the first outer reinforcing structure 74a opposite to the side on which the ribs 68 of the outer reinforcing plate 67 are provided. The remaining second to fourth outer structures 74b, 74c, 74d are also the first outer structure 7 described above.
It has the same configuration as 4a.

FIG. 5 is a sectional view taken along the line V--V of FIGS. 3 and 4.
It is sectional drawing seen from. The first inner structure 73a
The studs 63 are arranged in a region above the support plate 62 with a gap Δd1 in the vertical direction and with a gap Δd2 in the horizontal direction so as to be aligned in the vertical and horizontal directions.

The vertical interval Δd1 is, for example, 1
The horizontal distance Δd2 is set to, for example, 150 mm. The plurality of first studs 6
3, the length L1 is, for example, about 400 mm, and D2
Deformed reinforcing bars such as 2, D25, D29, and D32 may be appropriately selected and used. The remaining second to fourth inner structures 73
b, 73c, 73d also have the same configuration as the first inner structure 73a.

FIG. 6 is a sectional view taken along the line VI-- in FIG. 3 and FIG.
It is sectional drawing seen from VI. The second stud 64 of the fourth outer structure 74d is vertically spaced from the distance Δd
The first stud 63 is displaced from the first stud 63 by 1/2 of the interval Δd2 in the horizontal direction. The second stud 64 is provided with the first stud 63.
It has the same shape and material as. The first stud 63
The second stud 64 has a region overlapping in the axial direction as shown in FIG. 2, and its wrap length ΔL is, for example, about 200 mm. Remaining first to third outer structures 7
4a, 74b, and 74c have the same configuration as the above-described fourth outer structure 74d.

FIGS. 7 and 8 are diagrams showing the construction procedure of the embodiment. FIG. 7 is a simplified cross-sectional view taken along section line VII-VII in FIG. 1 showing a procedure for reinforcing the pier 51. FIG. 8 is a cross-sectional view of a bridge shaft 76 showing the procedure for reinforcing the pier 51. FIG. 4 is a simplified cross-sectional view cut vertically.
From the state of the pier before construction shown in FIGS. 7 (1) and 8 (1), as shown in FIGS. 7 (2) and 8 (2),
The first to fourth inner structures 73a, 73b, 73c, 73
d, on the outer surface, a plurality of first studs 6
3 are implanted at predetermined intervals from each other by stud welding. Next, FIG. 7 (3) and FIG.
As shown in (3), the first to fourth inner structures 73
The first to fourth outer structures 74a, 74b, 74c, and 74d, on which the plurality of second studs 64 are implanted in advance, are supported on the upper surface of the footing 52 outside a, 73b, 73c, and 73d. It is installed in the state where it was done. Next, FIG.
As shown in (4) and FIG. 8 (4), the space 7
7 is filled with a filling concrete 75 and cured and hardened for a certain period.
The outer reinforcing structure 65 and the footing 52
Are linked. Thus, the lower end 53 of the pillar 53
b is reinforced, and the connection strength between the column 53 and the footing 52 can be improved. Therefore, as described above, the amount of welding work on site can be reduced, and the workability can be improved.

FIG. 9 is a view for explaining a force transmission system of the pier 51 of the embodiment shown in FIGS.
For example, when a rightward horizontal force P _H perpendicular to the axis 53c of the column 53 is applied due to an earthquake or the like, a clockwise moment M is generated at the lower end 53b of the column 53. the second and fourth in the structure 73b, the 73d, respectively, the compressive force P _V, the tensile force -P _V occurs. On the tension side, the tensile force
P _V is the fourth in the structure 73d, the first stud 63, concrete 75, the second stud 64, the fourth outer structure 74
d, transmitted to the footing 52 via the reinforcing anchor bolt 69.

Therefore, on the tension side, the fourth inner structure 7
Tension -P _V acting on 3d is 74 the fourth outer structure
The shear force is generated between the fourth inner structure 73d and the fourth outer structure 74d by the reaction force R _{V of} d. This shear force is resisted by the first and second studs 63 and 64 and the filling concrete 75. In this way, the load imposed by the existing columns 53 is reduced and reinforced,
It can tolerate the tensile force -P _V.

On the compression side, the configuration of the second inner structure 73b, the second outer structure 74b and the concrete 75 is the same as the configuration on the tension side. Compressive force P _V acting on the second structure body 73b, the second structure body 7
3b, the first stud 63, the second stud 64, and the supporting force 66 of the second outer structure 74b are transmitted to the footing 52.

Therefore, on the compression side, the second internal structure 73
and the compressive force P _V acting on b, the reaction force -R _V of the Bearing plate 66
Thereby, a shearing force is generated between the second inner structure 73b and the second outer structure 74b. This shearing force is resisted by the first and second studs 63 and 64 and the filling concrete 75 similarly to the pulling side. In this way, the burden load by existing posts 53 is reinforced is reduced, it is possible to allow the compressive force P _V.

When the reinforcing anchor bolt 69 is not provided under the load state of the above-described horizontal force P _H , the fourth outer structure 74 d floats from the upper surface of the footing 52,
The aforementioned shear force is applied to the first and second studs 6 on the compression side.
3 and 64, the strength is increased by increasing the number of the first and second studs 63 and 64 or increasing the diameter of each of the first and second studs 63 and 64. There must be. By providing the reinforcing anchor bolt 69 on the pulling side to eliminate such inconvenience, the increase in strength as described above can be eliminated, and the construction cost can be reduced by downsizing the configuration.

[0033] In the above embodiment shown in FIGS. 1-9, is a reinforcing structure for installing an outer reinforcing structure 65 to the entire periphery of the inner reinforcing structure 57, the direction of action of the horizontal force P _H Depending on the configuration, only one combination of the first and third outer structures 74a and 74c or the second and fourth outer structures 74b and 74d may be provided.

In the above embodiment shown in FIGS. 1 to 9, the outer reinforcing plate 67 and the supporting plate 66 of the outer reinforcing structure 65 are connected to each other in a substantially L-shaped cross section. In another embodiment of the present invention, another cross-sectional shape such as an inverted T-shape may be used. When it is formed in an inverted T shape, the outer reinforcing plate 6
The supporting plate 66 can be fixed to the footing 52 with great strength by the reinforcing anchor bolts 69 on both sides of the base 7, and a large bearing area can be obtained.

FIGS. 10, 11 and 12 show another embodiment of the present invention in which the pillar 53 of the existing pier 51 of FIG. 1 is cut in a direction perpendicular to the plane of FIG. The pier reinforcement structure is shown. FIG. 10 shows the lower end 53 of the pillar 53.
FIG. 11 is an enlarged cross-sectional view of FIG.
It is sectional drawing seen from I-XI, and FIG. 12 is sectional drawing seen from cutting surface line XII-XII of FIG.

At the lower end 53b of the column 53, a circular inner reinforcing structure 90 is provided. On the outer surface of the cylindrical inner reinforcing plate 92 above the circular support plate 91, a plurality of first studs 93 are provided.
Are implanted by stud welding. The plurality of first
On the outer side of the stud 93, a plurality of second studs 94, which are arranged at intervals in the vertical and horizontal directions from each of the first studs 93, are preliminarily planted. A circular outer reinforcing structure 95 is provided in a state supported on the upper surface of the footing 52,
The pitch of the studs 94 is provided wider than the pitch of each of the first studs 93.

The outer reinforcing structure 95 is supported on the upper surface of the footing 52 and has a reinforcing anchor bolt 99 to be described later.
Annular support plate 96 in which an insertion hole 100 through which a shaft portion of the support member is inserted is formed, and the inner reinforcement structure 9 on the upper surface of the support plate 96.
A cylindrical outer reinforcing plate 97 provided at a right angle on one side of the zero side
And a plurality of trapezoidal ribs 98 for reinforcing the support plate 96 and the outer reinforcing plate 97, and a plurality of reinforcing anchor bolts 99 for connecting the support plate 96 and the footing.

The shaft portion of each reinforcing anchor bolt 99 is inserted into each insertion hole 100, a washer 101 is mounted on the upper end of the reinforcing anchor bolt 99, and a nut 102 is screwed into the reinforcing anchor bolt 99. The footing 52 is connected.

The space 104 between the inner reinforcing structure 90 and the outer reinforcing structure 95 is filled with concrete 103, cured for a certain period of time, and hardened to form the first and second studs 93. , 94 are fixed, and the lower end portion 53b of the column 53 and the outer reinforcing structure 95 are fixed.
And the connection strength between the column 53 and the footing 52 can be improved.

When a moment acts on the lower end 53b of the column 53, the shearing force generated in the reinforcing portion by the acting moment is resisted by the first and second studs 93 and 94, as in the above-described embodiment. You.

In each of the above embodiments, the pier has a T-shaped pier shape, but the inverted L-shaped beam 54 may be a cantilever type pier.

FIGS. 13 and 14 show an example of a connection between a steel pipe pile 110 and a pillar 111 of a pier showing still another embodiment of the present invention. FIG. 13 shows the steel pipe pile 110 and the pillar 111.
14 is a cross-sectional view taken along the line XIV-XIV in FIG. 13.

The steel pipe pile 110 is cast in the ground, and a column 111 is inserted into the upper end of the steel pipe pile 110 by a predetermined length L2. The pillar 111 has a plurality of first studs 112 implantable on a surface thereof, and
The studs 112 are radially welded to the surface of the pillar 111 at intervals from each other by stud welding.

On the inner peripheral surface of the steel pipe pile 110, the second studs 11 are spaced apart from the respective first studs 112.
3 are radially implanted such that the pitch of each second stud 113 is larger than the pitch of each first stud 112.

The space 115 between the steel pipe pile 110 and the pillar 111 is filled with a filling concrete 114, cured for a certain period of time, and hardened, thereby forming the first concrete.
Then, the second studs 112 and 113 are fixed, and the steel pipe pile 110 and the column 111 are connected.

When a moment acts on the column 111, the shearing force generated at the connecting portion by the acting moment is the same as the first and second embodiments described above.
Studs 112 and 113 and filled concrete 114
Be resisted by

In each of the above embodiments, concrete is filled as a filler, but as still another embodiment of the present invention, cement mortar may be used as a filler.

[0048]

As described above, according to the present invention, the welding work on site is reduced by implanting the second studs in advance in the outer reinforcing structure. Since only studs are planted in the inner reinforcement structure,
Welding work on site can be significantly reduced. The construction work involves installing an outer reinforcing structure around the inner reinforcing structure and filling the space between the inner and outer reinforcing structures with filler, so the number of work steps on site is small. Corners and workability can be improved, the lower end of the column can be reinforced, and the connection strength between the column and the footing can be improved. Further, a work yard for welding the second stud to the outer reinforcing structure is not required, and the occupied work yard required for reinforcement work on a road or the like can be reduced.

Further, according to the present invention, since the outer reinforcing structure and the footing are connected by the connecting means, the inner reinforcing structures disposed on the tension side and the compression side of the column with respect to the moment acting on the column, respectively. Both the body and the outer stiffening structure can withstand the moment. As a result, the load sharing between the inner reinforcing structure and the outer reinforcing structure is reduced, and the structure of the inner reinforcing structure and the outer reinforcing structure, in particular, the number and diameter of the first and second studs are reduced to reduce the cross-sectional structure. The size can be reduced, and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a pier reinforcement structure according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a lower end 53b of a pillar 53 of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG. 2;

FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV of FIG. 2;

FIG. 5 is a cross-sectional view taken along line VV of FIGS. 3 and 4;

FIG. 6 is a sectional view taken along section line VI-VI in FIGS. 3 and 4;

7 is a simplified cross-sectional view showing the procedure of reinforcing work of the pier 51 viewed from a section line VII-VII in FIG. 1, and FIG. 7A shows a state of the pier before construction; (2) shows a state in which a plurality of first studs are implanted on the outer surface of the first to fourth inner structures, and FIG. FIG. 7D shows a state in which the first to fourth outer structures in which the second studs are planted are installed, and FIG. 7D shows a state in which filled concrete is filled in a space between the inner reinforcing structure and the outer reinforcing structure. It shows a state in which the outer reinforcing structure and the footing are connected by the reinforcing anchor bolt after filling.

FIG. 8 is a simplified cross-sectional view showing a procedure for reinforcing the pier 51, and FIG. 8 (1) shows a state of the pier before construction;
FIG. 8 (2) shows a plurality of first structures on the outer surface of the first to fourth inner structures.
FIG. 8 (3) shows a state in which the studs have been implanted.
FIG. 8D shows a state in which first to fourth outer structures in which a plurality of second studs are implanted in advance outside the fourth inner structure are installed. FIG. 8D shows the inner reinforcing structure and the outer reinforcing structure. FIG. 6 shows a state in which the space between the outer reinforcement structure and the footing is connected to each other with the reinforcement anchor bolts after filling the space between the bodies with the filled concrete.

FIG. 9 is a view for explaining a force transmission system of the pier according to the embodiment shown in FIGS. 1 to 8;

FIG. 10 is a lower end portion 5 of a pillar 53 according to another embodiment of the present invention.
It is an expanded sectional view of 3b.

FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 10;

FIG. 12 is a cross-sectional view taken along the line XII-XII of FIG. 10;

FIG. 13 is a cross-sectional view showing the vicinity of a connection portion between a steel pipe pile 110 and a pillar 111 of a pier showing still another embodiment of the present invention.

FIG. 14 is a sectional view taken along section line XIV-XIV in FIG. 13;

FIG. 15 is a sectional view of an existing pier 1 showing a typical conventional technique.

FIG. 16 is an enlarged sectional view of a lower end portion of the column in FIG.

FIG. 17 is an enlarged cross-sectional view as viewed from a section line XVII-XVII in FIG. 15;

[Explanation of symbols]

 51 Existing pier 52 Footing 53 Pillar 57,90 Inner reinforcing structure 63,93,112 First stud 64,94,113 Second stud 65,95 Outer reinforcing structure 69,99 Reinforcing anchor bolt 75,103,114 Filling Concrete 77,104,115 space

Claims (2)

[Claims] 1. A pier reinforcement structure in which a pillar is integrally formed on a reinforced concrete footing buried underground, and a beam for supporting an upper structure is integrally formed above the pillar. At least at the lower end of the pillar, an inner reinforcing structure made of steel is provided, and a plurality of first studs projecting outward are implanted in the inner reinforcing structure at an interval from each other. A state in which a plurality of second studs are pre-planted on the outer surface of the reinforcing structure at intervals in the direction perpendicular to the axis substantially parallel to the first studs, and are supported on the upper surface of the footing. A space in which the first and second studs are arranged is formed between the inner reinforcing structure and the outer reinforcing structure;
A bridge pier reinforcement structure characterized by filling and curing this space with filler. 2. The pier reinforcement structure according to claim 1, wherein the outer reinforcement structure and the footing are connected by connecting means.