KR101402427B1 - Column-coping part joint structure with concrete filled tube for composite hollow precast bridge - Google Patents

Abstract

The present invention relates to a joining structure between a column member and a coping member of a prefabricated hollow precast precast bridge pier, comprising an outer steel pipe, a concrete portion filled in the inner surface of the outer steel pipe, and an inner A prefabricated internally constrained hollow precast bridge pier comprising a plurality of column segments having steel tubes and laminated between a base portion of a bridge pier and a coping portion and a column portion connecting member for joining a plurality of column segments to be laminated, Wherein the uppermost column segment bonded to the coping portion of the segment is spaced apart from the uppermost column segment along a circumferential direction of the uppermost column segment and one side of the vertical bonding member is embedded in the concrete portion and the other side thereof is embedded in the coping portion; And is embedded in the concrete portion, A joining member having a longitudinal joining member joined to the vertical joining member and a vertically joining member adjacent to the vertical joining member at an upper end to form an n-type joining connecting member; And a diaphragm protruding from the inner steel pipe toward a hollow inside the uppermost column segment. Even if vibrations occur in the pier, the nut is released by vibration as in the prior art, so that the upper end of the column and the co- And a diaphragm is provided on the inner side of the inner steel pipe to improve the contact area to prevent punching failure. The corrugated pipe is installed in the coping portion to improve the attaching performance, and the cushion pad is installed, Due to the difference in rigidity of the coping portion, local fracture occurs in the clamping portion at the joint portion It can be prevented.

Description

{COLUMN-COPING PART JOINT STRUCTURE WITH CONCRETE FILLED TUBE FOR COMPOSITE HOLLOW PRECAST BRIDGE}

More particularly, the present invention relates to a joining structure of a column member and a coping member of a prefabricated inner confined hollow precast pier using a concrete filled pipe.

In general, bridge piers constructed in bridges are paved concrete structures, concrete piles are laid in a state where basic reinforcing bars and formworks are placed after the foundation trenching works, and curing period is made for a certain period to form a foundation part A coping part which cures a bridge pier and forms an upper part of the pier, that is, a coping part that supports a bridge top plate, forms a coping part by placing a concrete in a primary or secondary process in a state in which a form is placed while supporting a pier Complete the bridge.

Such a conventional method of installing a spot in the field requires a lot of construction period and expense in the installation of the formwork and the demolding work of the form after the construction, and in the case of the overpass road construction depending on the construction location, traffic congestion is given around the construction site, There is a problem that the construction management is difficult and there is a concern about the construction of the poor in the situation where the working environment is poor such as underwater construction requiring the ability.

In order to solve such a problem of the conventional spot installation method, a prefabricated installation method of assembling and assembling a bridge pier as a unit structure has been proposed. Since the precast unit is manufactured at the factory, the quality control of the concrete is advantageous, and it is possible to reduce the time required for the installation and curing of the formwork in the field, and the production of the precast unit is performed in parallel with the foundation work So that the air can be shortened.

As such a prefabricated construction method, a prefabricated bridge structure using a concrete filled tube as shown in Fig. 1 has been proposed. Prefabricated pier structure using concrete filled steel pipe is a structure filled with concrete inside a round or square section steel pipe. Since steel pipe restrains concrete inside, it has excellent advantage of preventing local buckling, has excellent ductility , The section is reduced due to the increase of the stiffness with respect to the bending moment, and the self weight is reduced compared to the existing concrete bridge piers.

The prefabricated pier structure using the conventional concrete filled steel pipe shown in Fig. 1 is composed of at least one precast unit stacked between the base part and the coping part, and each precast unit is composed of an outer steel pipe composed of a steel pipe, And a corrugated steel pipe provided on the hollow inner surface of the concrete portion to constrain the concrete portion to improve rigidity against bending moment and to facilitate assembly and assembly have.

The joining structure of the upper end portion of the column and the coping portion of the conventional pier structure according to the prior art is such that a steel bar having a thread formed at the end portion thereof is buried in a concrete portion at the upper end of the column, So that the column top portion and the coping portion are bonded.

On the other hand, bridge piers play an important role to resist the lateral load such as earthquake as well as to transmit the load of the upper structure to the lower part as an axial force, so that the bridge pierces not only the vertical load but also the lateral load and the bending moment Should be designed.

Particularly, in the prefabricated pier structure, since the precast unit itself is manufactured at a factory, the precast unit itself can sufficiently secure the rigidity against bending moment as well as the vertical load and the lateral load of the precast unit itself, It is difficult to secure sufficient stiffness against bending moments at the joints of each other. Therefore, the performance of such joints determines the rigidity performance with respect to the vertical load, lateral load, and bending moment of the entire piers.

However, in the assembled pier structure according to the related art, the joining structure of the pillar upper portion and the coping portion is such that the steel rods are embedded in the concrete portion at the upper end of the column and fixed to the front end portion of the steel bar exposed above the upper surface of the coping portion, The reinforcing bar or the steel bar inserted in the uppermost column segment has a disadvantage in that the nut is loosened in the case of a pier where a large amount of vibration is generated, There is a problem that the possibility of separation from the column portion concrete is very high.

Further, in the assembled pier structure according to the related art, there is a problem that there is a fear that local fracture may occur in the coping portion in the joint portion because there is a difference in the stiffness between the column top portion and the coping portion.

It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method of manufacturing a bridge pier in which a bending moment and a shear And to provide a column-coping junction structure of a prefabricated inner confined hollow precast bridge pier which is capable of satisfactorily securing the performance of joints, such as strength against moment and vibration load, and stably joining the column top portion and the coping portion without fear of separation.

It is another object of the present invention to provide a post-internally confined hollow pre-cast pierched column-cemented joint structure capable of preventing local breakage between the column top and the coping portion, thereby stably joining the column top portion and the coping portion without fear of separation.

According to an aspect of the present invention, there is provided a pillar-coping joint structure of a prefabricated hollow precast pier in accordance with the present invention comprises an outer steel pipe, a concrete part filled in the inner surface of the outer steel pipe, A prefabricated inner constrained hollow precast pier bridge having a plurality of column segments each having an inner steel pipe for confining a concrete portion and stacked between a base portion of the bridge pier and the coping portion and a column connecting member for joining the plurality of column segments to be laminated , The uppermost column segment bonded to the coping portion of the plurality of column segments is spaced at a predetermined distance along the circumferential direction of the uppermost column segment, one side is embedded in the concrete portion and the other side is vertically A reinforcing member that is embedded in the concrete portion, A joining member having a horizontal joining member surrounding the ash and being fastened to the vertical joining member, and a joining connecting member connecting the vertical joining member adjacent to the vertical joining member at an upper end to form an n-type structure; And a diaphragm which is integrally formed with the upper end column portion and protrudes from the inner steel pipe toward the hollow inside the uppermost column segment.

The diaphragm further includes a support bracket integrally formed with the diaphragm and the inner steel pipe and supporting the diaphragm.

The cushioning pad may further include a cushion pad disposed between the outer steel pipe and the inner steel pipe at an upper end of the uppermost column segment and having an insertion hole into which the vertical joint member is inserted.

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The plurality of corrugated tubes may further include a plurality of corrugated tubes installed in the coping portion and surrounding each of the vertical joining members protruding from the corrugating portion and filled with a filler.

In this case, a reinforcing bar surrounding the corrugated pipe in a spiral shape is further provided.

According to the column-coping joining structure of the prefabricated internally constrained hollow precast pier of the present invention having the above-described configuration, a joining member having a vertical joining member and a transverse joining member is provided between the uppermost column segment and the coping portion, Even if vibration occurs, the nut can be loosened by vibration as in the prior art, so that the upper end of the column and the coping portion can be stably bonded without fear of separation, and a diaphragm is provided inside the inner steel pipe, It is possible to prevent breakage of punching due to the load acting on the bridge pier.

In addition, a corrugated pipe surrounding the vertical joining member is provided in the coping portion to improve adhesion performance between the column segment and the coping portion by the vertical joining member and the corrugated pipe, and a spiral reinforcing bar is disposed around the corrugated pipe It is possible to further improve the adhesion performance and to prevent the local destruction around the corrugated tube.

In addition, by providing a buffer pad between the uppermost column segment and the coping portion, it is possible to prevent local breakage of the coping portion in the joining portion due to the difference in rigidity between the upper end portion of the column and the coping portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a column-coping portion bonding structure of a pier structure according to the prior art.
FIG. 2 is a view showing a column-coping joint structure of a prefabricated inner confined hollow precast bridge pier according to the present invention.
3 is a sectional view taken along the line A-A 'in Fig.
4A and 4B are views showing a diaphragm and a support bracket according to the present invention.
5 is a view showing a buffer pad of the present invention.
6A to 6C are views showing the corrugated pipe and the reinforcing steel of the present invention.
7A and 7B are views showing another example of the corrugated tube and the joining member of the present invention.
8 is a perspective view of the joining member of Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

The column-coping bonded structure (1) according to the present invention is applied to a prefabricated internally constrained hollow precast bridge pier including a plurality of precast column segments laminated between a base portion and a coping portion, To the uppermost column segment (2) joined to the coping portion (3) of the pier.

The uppermost column segment (2) has an outer pipe (2b) formed into a cylindrical shape and a cylindrical inner pipe (2b) disposed inside the outer pipe and having a diameter smaller than the diameter of the outer pipe so that a space is formed between the outer pipe A concrete part to be filled in the inner surface of the outer steel pipe, and a column part connecting member (not shown) for joining adjacent column segments provided on the lower side of the column segment.

In the present embodiment, the outer steel pipe and the inner steel pipe have a cylindrical shape. However, the outer steel pipe and the inner steel pipe may have a rectangular shape.

2 to 6C, the column-and-coping bonded structure 1 of the prefabricated inner confined hollow precast pier according to the present invention is installed between the uppermost column segment 2 and the coping portion 3.

The column-coping bonded structure 1 includes a joining member 10, a diaphragm 20, a buffer pad 30, and a corrugated pipe 40.

The joining member 10 is composed of a vertical joining member 11 and a transverse joining member 12. The vertical joining member 11 is formed of a steel bar or a deformed steel bar and is disposed at a predetermined interval along the circumferential direction of the uppermost column segment 2. [ The vertical joining member 11 is disposed between the outer steel pipe 2b and the inner steel pipe 2a and is embedded in the concrete portion and the other end is protruded upward from the uppermost column segment 2, And is embedded in the coping portion 3.

The transverse direction joining member 12 is fastened to the vertical joining member 11. The transverse direction joining member 12 is, for example, formed of a deformed reinforcing bar and disposed to surround the vertical joining member. The transverse joining member 12 is disposed between the outer steel pipe 2b and the inner steel pipe 2a, .

The joining member 10 may further include a joining connecting member 14.

7A, 7B and 8, the joining member 10 includes a joining connecting member 14 for joining the vertical joining members adjacent to the vertical joining members to each other at the upper ends of the vertical joining members . According to the configuration of the joint connecting member, the vertical joint member is formed of an n-shaped vertical joint member 13, and the n-shaped vertical joint member is firmly attached to the coping portion or inserted into a wave tube to be described later The filling material such as mortar filled in the corrugated tube and the n-shaped vertical joint member are more firmly attached to further improve the adhesion performance between the uppermost column segment and the above-mentioned coping portion, so that when the vibration load acts on the bridge pier, Can be prevented more stably.

A diaphragm 20 is provided inside the uppermost column segment 2. The diaphragm 20 is integrally formed with the inner steel pipe at a position spaced apart from the upper end of the uppermost column segment by a predetermined distance and is formed to protrude from the inner steel pipe toward the hollow inside the uppermost column segment.

Since the internally confined hollow CFT column to which the column-coping junction structure according to the present invention is applied has a hollow ratio of 0.7 or more at a target ratio, the grounding area of the coping portion is narrow, and punching failure is very likely to occur.

The contact area between the coping portion 3 and the uppermost column segment is increased by the diaphragm 20 formed integrally with the column segment when the coping portion 3 is provided on the uppermost column portion 2 Thus, punching failure due to a load acting on the pier can be prevented, and resistance to shear force can be improved.

A through hole may be formed at the center of the diaphragm 20 to accommodate the thermal deformation of the diaphragm and to facilitate the construction.

4A and 4B, a support bracket 21 for supporting the diaphragm can be further provided inside the inner steel pipe 2a. The support bracket 21 is formed in a substantially triangular shape and is integrally formed with the diaphragm and the inner steel pipe. The support bracket 21 is configured to support the diaphragm to prevent deformation of the diaphragm due to a load acting on the diaphragm.

As described above, when a load is applied to the bridge pier, there is a difference in the stiffness between the coping portion supporting the bridge pier and the pillar. Therefore, in a portion between the coping portion and the column, particularly at the junction between the end of the column top portion and the coping portion There is concern that local destruction may occur.

In order to prevent this, in the present invention, a buffer pad 30 is provided at the upper end of the uppermost column segment 2.

The buffer pads 30 are elastic pads made of rubber in this embodiment, but the pad is not necessarily limited to this, and may be made of plastic such as PVC if it has a certain elastic force.

The buffer pad 30 is formed in a substantially annular shape and is disposed between the outer steel pipe and the inner steel pipe at the upper end of the uppermost column segment. In addition, the buffer pad 30 is formed with an insertion hole 31 for facilitating the installation of the vertical joining member 11. The insertion hole 31 may be formed corresponding to the number of the vertical joining members 11 and may have a long circular arc shape so that the vertical joining member can be easily installed on the buffer pad.

The vertical joining member 11 may be formed to be directly embedded in the concrete placed in the coping portion. However, in the present embodiment, it is possible to improve the adhesion performance between the uppermost column segment and the coping portion, Holes may be formed in the coping portion 3 and the vertical joining member 11 may be installed in the hole through a separate buried pipe.

6A to 6C, the column-coping bonding structure 1 of the present invention may further include a wave tube 40 into which the vertical bonding material is inserted. The corrugated pipe 40 is formed to have a corrugated outer surface in order to improve adhesion with the coping portion and may be inserted into a hole previously formed in the coping portion 3.

The corrugated pipe 40 surrounds each of the vertical joining members protruding from the coring part and embedded therein. The vertical joining member 11 is inserted into the corrugated pipe 40 and then filled with filler such as mortar , The vertical joining member (11) and the corrugated tube can be formed to behave as a single body, and the adhesion performance between the corrugated tube and the coping part can be improved, so that the uppermost column segment and the coping part And can be stably bonded.

The corrugated pipe (40) is provided with the corrugated pipe (3) in advance, after the corrugated pipe (3) is installed in the coping part (3), the vertical joining member is inserted into the corrugated pipe And the column-coping joint structure according to the present invention can be manufactured in advance in the factory to shorten the construction period of the pier structure in the field.

That is, after the joining member is inserted into the uppermost column segment, the diaphragm is integrally formed on the inner steel pipe, the wave tube is provided so as to surround the vertical joining member after inserting the absorbing pad, , The diaphragm, the buffer pad, and the uppermost column segment integrally formed with the corrugated pipe are stacked on the column segment to be installed in the field, and then the corpulse portion in which the holes are formed is fitted to the corrugated pipe, have.

In addition, when the junction member is connected to the vertical joining member to constitute the n-shaped vertical joining member 13, the corrugated pipe may be configured to have a rectangular cross-section using a corrugated plate, Member 13 may be inserted into the n-shaped vertical joining member 13, or the n-shaped vertical joining member 13 may be inserted into the corrugated pipe so as to have an elliptical cross-section.

In order to further improve the adhesion performance between the corrugated pipe and the coping portion, a reinforcing bar 41 may be further provided. The reinforcing bar is installed in the coping portion 3 and is configured to surround the corrugated pipe in a spiral shape as shown in FIG. 6C.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be exemplary and explanatory only and are not to be construed as limiting the scope of the inventive concept. And it is obvious that it is included in the technical idea of the present invention.

1: Column-coping bonded structure
10:
11: vertical joining member 12: transverse joining member
20: Diaphragm
30: buffer pad
40: wave tube

Claims (6)

A plurality of column segments each having an outer steel pipe, a concrete portion filled in the inner surface of the outer steel pipe, and an inner steel pipe installed on the inner surface of the concrete portion to confine the concrete portion and stacked between the base portion of the pier and the coping portion; A prefabricated internally constrained hollow precast pier with column post portions joining a plurality of column segments together,
Wherein the uppermost column segment, which is joined to the coping portion of the plurality of column segments,
A vertical joining member disposed at a predetermined distance along the circumferential direction of the uppermost column segment and having one side embedded in the concrete portion and the other side embedded in the coping portion; A joining member having a horizontal joining member to be coupled to the vertical joining member, and a joining connecting member connecting the vertical joining member adjacent to the vertical joining member at an upper end to form an n-type structure,
And a diaphragm integrally formed on the inner steel pipe and protruding from the inner steel pipe toward a hollow inside the uppermost column segment, wherein the diaphragm is integrally formed with the inner steel pipe.
The method according to claim 1,
Further comprising a support bracket integrally formed with the diaphragm and the inner steel pipe to support the diaphragm, wherein the support bracket supports the diaphragm.
The method according to claim 1,
Further comprising a cushion pad disposed between the outer steel pipe and the inner steel pipe at an upper end of the uppermost column segment and having an insertion hole into which the vertical joint member is inserted, Junction structure.
delete 4. The method according to any one of claims 1 to 3,
Further comprising a plurality of corrugated tubes surrounding each of the vertical joining members protruded and embedded to the coping portion and filled with a filler material therein.
6. The method of claim 5,
Further comprising a reinforcing bar surrounding the corrugated pipe in a spiral shape. The column-coping joining structure of the prefabricated internally constrained hollow precast pier.

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