KR102538562B1 - Separation of concrete abutment wall and foundation construction method of Rahmen structure - Google Patents

Abstract

The present invention minimizes the bending moment acting on the foundation and secures the stability of the alternating wall, but makes it easy to construct the hinge structure and makes the wall arrangement simple. Provides a linking structure. A construction method for separating and pouring connection between an alternating wall and a foundation according to a preferred embodiment of the present invention includes the steps of (a) manufacturing a foundation shear connector unit that is installed on a foundation and connects an alternating wall; (b) constructing a foundation having the foundation shear connector unit positioned and installed in an alternating wall self-supporting groove recessed along the width direction on an upper surface of the foundation; (c) installing a plate-shaped elastic pad made of rubber or EVA on the bottom surface of the alternating wall self-supporting groove; (d) assembling the alternating wall reinforcing bars upward of the alternating wall self-supporting groove on the foundation; (e) constructing the alternating wall by installing formwork around the reinforcing bars of the alternating wall and then pouring on-site concrete; characterized in that it includes.

Description

Separation of concrete abutment wall and foundation construction method of Rahmen structure

The present invention relates to a construction method for connecting an abutment wall and a foundation of a bridge and a connection structure thereof, and in particular, to minimize the bending moment acting on the foundation and secure the conduction stability of the abutment wall during construction. It relates to a separate casting connection construction method and its connection structure.

In general, ramen bridges have a problem in that the lower part of the wall and the foundation are connected with reinforced concrete, so that the member forces (axial force, shear force, bending moment) acting on the upper structure and the wall increase the dimensions of the foundation.

Therefore, by separating the connection structure of reinforced concrete, which is the main material connecting the bottom of the wall and the foundation, to induce a similar behavior to the hinge device, the bending moment of the member force generated by the applied load is not transmitted to the foundation, thereby reducing the dimensions of the foundation. school is being developed.

While these ramen bridges can obtain advantages such as economic feasibility and shortening of the construction period through the reduction of basic specifications, there is a problem that safety is somewhat lacking in terms of construction.

For example, in the case of a hinged ramen bridge in which both the wall and the foundation are made of precast, there is a concern about a fall accident of the wall during the construction process before the upper structure is integrated with the wall. This is because the overturning stability of the wall was not secured prior to installation and connection of girders during construction.

Therefore, it is necessary to find a connection method that has a structure in which the wall is separated from the foundation and secures the conduction stability of the wall.

The background technology of the present invention includes Korea Patent Registration No. 10-1007708 (semi-hinge ramen bridge and its construction method), the same registration number 10-1836326 (ramen structure and its construction method), and the same registration No. 10-2153426 (Connected slab integral type and ramen bridge with minimized foundation size and its construction method) is proposed. These background arts configure a hinge between the wall and the foundation so that the moment is not transmitted to the foundation. However, these background arts do not suggest a solution to the wall conduction problem in the construction stage.

On the other hand, as other technologies that are the background of the present invention, Korea Patent Registration No. 10-1991930 (Ramen Bridge and its construction method) and No. 10-1714159 (Bending moment transmission separation device equipped with a fall prevention device and using the same) Ramen bridge) mentions the problem of wall conduction, but the wall-base is fixed using a coupler during construction to prevent the wall from overturning during construction and construction of the bottom plate hinge of the wall. However, the former background technology has the disadvantage of not being able to handle the hinge of the coupler after completion of construction when the back of the wall is piled up, and the construction difficulty is high, and the latter background technology has the disadvantage of poor manufacturability of the hinge device and complicated wall arrangement there is.

Korea Patent Registration No. 10-1007708 Korea Patent Registration No. 10-1836326 Korea Patent Registration No. 10-2153426 Korea Patent Registration No. 10-1991930 Korea Patent Registration No. 10-1714159

The present invention minimizes the bending moment acting on the foundation and secures the conduction stability of the alternating wall during construction, but the construction for the hinge structure is easy and the wall reinforcement is simple. Separate casting connection between the alternating wall and the foundation Its purpose is to provide a construction method and its connection structure.

A construction method for separating and pouring connection between an alternating wall and a foundation according to a preferred embodiment of the present invention includes the steps of (a) manufacturing a foundation shear connector unit that is installed on a foundation and connects an alternating wall; (b) constructing a foundation having the foundation shear connector unit located and installed in an alternating wall self-supporting groove recessed to a predetermined depth along the width direction on an upper surface of the foundation; (c) installing a plate-shaped elastic pad made of rubber or EVA on the bottom surface of the alternating wall self-supporting groove; (d) assembling the alternating wall reinforcing bars upward of the alternating wall self-supporting groove on the foundation; (e) constructing an alternating wall by installing formwork around the reinforcing bars of the alternating wall and then pouring on-site concrete, wherein, in step (a), the foundation shear connector unit has an I-shaped or ⊥-shaped cross section Including foundation steel with a lower flange and web, stirrup reinforcing bars joined to form an L shape on both sides of the web of the foundation steel at regular intervals, and longitudinal reinforcing bars connected to stirrup reinforcing bars to be connected to the wall main reinforcing bars, In the step (b), the lower flange at one end of the foundation shear connector unit is embedded in the concrete layer of the foundation, and the stirrup bar and longitudinal reinforcing bar at the other end are exposed above the alternating wall self-supporting groove, and (c ) step, an outer ordering material is installed between both ends of the elastic pad and the vertical inner surface of the self-supporting groove of the alternating wall, and an inner ordering material having a waterproof function and a stretch function is installed at the corner where the outer ordering material and the elastic pad meet. to be

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In addition, in the step (d), it is characterized in that the wall connecting steel form for girder connection is further installed on top of the alternating wall reinforcement.

In addition, in the step (d), the wall connecting steel anchor is installed on the upper part of the alternating wall reinforcement, and the wall connecting steel anchor is connected and installed to the wall connecting steel anchor after curing the cast-in-place concrete or demolding the formwork. .

On the other hand, in the hinge connection structure between the alternating wall and the foundation according to the present invention, a foundation having an alternating wall self-supporting groove recessed to a certain depth along the width direction on the upper surface is installed in the ground, and one end is embedded and fixed to the concrete layer of the foundation and the other end is installed at a certain height from the bottom of the alternating wall self-supporting groove, a foundation shear connector unit is installed, an elastic pad made of rubber or EVA in a plate shape is installed on the bottom of the alternating wall self-supporting groove, and an elastic pad An outer ordering material is installed between both ends of the alternating wall and the vertical inner surface of the self-supporting groove of the alternating wall, respectively, and an inner ordering material having a waterproof and elastic function is installed at the corner where the outer ordering material and the elastic pad meet. It is characterized in that the alternating wall reinforcing bars are assembled and installed to be connected to the foundation shear connector unit upwardly, and the in-situ concrete is synthesized to the alternating wall reinforcing bars to install the alternating wall.

According to the separate casting connection construction method and connection structure of the alternating wall and the foundation of the present invention, the alternating wall is connected to the foundation through the foundation shear connector unit and at the same time forms a separate hinge structure through the elastic pad, so the bending moment transmitted to the foundation can be minimized. Of course, by minimizing the bending moment transmitted to the foundation, the dimensions of the foundation are reduced, resulting in economic feasibility during bridge construction.

In addition, since the alternating wall reinforcing bars are connected to the foundation shear connector unit, conduction stability can be secured during on-site concrete placement of the alternating wall.

The following drawings attached to this specification illustrate a preferred embodiment of the present invention, and together with the detailed description of the present invention serve to further understand the technical idea of the present invention, the present invention is limited to those described in the accompanying drawings. It should not be construed as limiting.
1a to 8b are views related to the construction method and structure of the alternate casting connection of the alternate wall and the foundation of the present invention,
1A and 1B are a perspective view and a side view of a foundation shear connector unit,
2a and 2b are a perspective view of a foundation shear connector unit installed on a foundation and an enlarged view of one side of FIG. 2a,
3a and 3b are a perspective view and a side view in which the alternating wall reinforcing bars are assembled;
Figure 4 is a perspective view of the wall connecting steel type installed on top of the alternating wall reinforcement,
5 is a state diagram of the formwork installation after installation of alternating wall reinforcement,
6 is a state in which the formwork is demolded after pouring on-site concrete in the state of FIG. 5;
7 is an exemplary view of a ramen bridge constructed by applying a hinge connection construction structure of an alternating wall and a foundation,
Figures 8a and 8b is a perspective view and a side view of an alternating wall in which the wall connection steel type anchor is installed and the wall connection steel type anchor is installed.

Below, the present invention will be described in detail with reference to the embodiments presented in the accompanying drawings, but the presented embodiments are illustrative for a clear understanding of the present invention, and the present invention is not limited thereto.

Fabrication of foundation shear connector unit

First, as shown in FIGS. 1A to 2, the foundation shear connector unit 14 for installation on the foundation 12 is manufactured. The foundation shear connector unit 14 transmits the shear force acting on the concrete of the abutment wall 40 to the foundation 14 while connecting the foundation 12 and the abutment wall 40.

1A and 1B, the foundation shear connector unit 14 includes a foundation steel member 141 having a lower flange 141a and a web 141b by an I-shaped or ⊥-shaped cross section, and a web of the foundation steel member 141 ( 141b) Longitudinal reinforcing bars connected to stirrup bars 142 to be connected to stirrup reinforcing bars 142 joined at regular intervals on both sides and wall main reinforcing bars 202 of alternating wall reinforcing bars 20 to be described later ( 143).

Here, the stirrup reinforcing bar 142 may be manufactured in an L shape and bonded to both sides of the web 141b, or may be manufactured in a ∪ shape and then bonded through the web 141b.

construction of the foundation

Then, as shown in FIG. 2, constructing the foundation 12 having the foundation shear connector unit 14 installed and located in the alternating wall self-supporting groove 121 recessed to a certain depth along the width direction on the upper surface of the foundation 12 do.

Here, the lower flange 141a on one end side of the foundation shear connector unit 14 is embedded in the concrete layer of the foundation 12, and the stirrup reinforcing bars 142 and the longitudinal reinforcing bars 143 on the other end thereof are alternate wall self-supporting grooves It is installed and exposed to the upper part of (121).

Installation of elastic pad

Then, as shown in FIG. 2B, a plate-shaped elastic pad 16 made of rubber or EVA is installed on the bottom surface of the alternate wall self-supporting groove 121. The elastic pad 16 elastically supports the lower end of the alternating wall 40 . Therefore, the elastic pad 16 absorbs a portion of the bending moment of the abutment wall 40 to minimize the bending moment transmitted to the foundation 12, and prevents damage to the contact surface between concrete due to pressure. In addition, the elastic pad 16 forms a separation surface between the alternating wall 40 and the foundation 12, and at the same time, the alternating wall 40 connected to the foundation 12 through the shear heat insulation unit 14 due to the elastic support of the hinge behavior is possible.

Here, an outer ordering material 17 is installed between both ends of the elastic pad 16 and the vertical inner surface of the alternating wall self-supporting groove 121, respectively, and at the corner where the outer ordering material 17 and the elastic pad 16 meet. An inner liner 18 having a waterproof function and a stretch function may be further installed. In this case, the lower edge of the alternating wall 40 is in elastic contact with the inner order material 18 to prevent breakage due to contact during hinge behavior, and since the elastic pad 16 is not exposed to rainwater, durability can be improved there is.

Assembly of alternating wall reinforcing bars

Next, as shown in FIGS. 3A and 3B, the alternating wall reinforcing bars 20 are assembled to the base 12 upward of the alternating wall self-supporting groove 121. At this time, the wall main reinforcement 202 of the alternating wall reinforcement 20 is connected to the longitudinal reinforcement 143 of the foundation shear connector unit 14. Therefore, the alternating wall reinforcing bars 20 are connected to the foundation steel 141 of the foundation shear connector unit 14 via the longitudinal reinforcing bars 143 and installed independently on the foundation 12, so that the site concrete of the alternating wall 40 There is no fear of overturning when pouring.

In this process, as shown in FIG. 4, a wall connecting steel form 22 for connecting the girder 110 shown in FIG. 7 may be further installed on top of the alternating wall reinforcement 20.

In addition, as another form for connecting the girder 110, as shown in FIG. 8a, a wall connecting steel anchor 24 is installed on top of the alternating wall reinforcement 20, and after curing of the cast-in-place concrete or demolding of the formwork 200 The wall connection steel type 22 may be connected and installed to the wall connection steel type anchor 24 as shown in FIG. 8B.

In this way, when the wall connecting steel form 22 for girder connection is further installed on the upper part of the alternating wall reinforcement 20, the girder 110 and the wall connecting steel form 22 are rigidly joined with bolts to form a ramen bridge as shown in FIG. 10) can be constructed, and when the girder 110 is installed, the negative moment resistance can be sufficiently exerted.

Formwork installation and on-site concrete pouring

Then, after installing the formwork 200 around the alternating wall reinforcing bars 20 as shown in FIG. 5, on-site concrete is poured to construct the alternating wall 40 as shown in FIG.

In this way, since the alternating wall 40 is connected to the foundation 12 via the foundation shear connector unit 14 and at the same time has a structure separated from the elastic pad 16 portion, the alternating wall 40 has a structure capable of hinge behavior By having a, it is possible to reduce the bending moment acting on the foundation, and as a result, the size of the foundation 12 can be reduced, making it possible to construct an economical ramen bridge.

In addition, although the alternating wall 40 is separated by the elastic pad 16, it is connected to the foundation 12 via the foundation shear connector unit 14, thereby preventing the alternating wall 40 from overturning during construction. This ensures overturning stability when girder is installed.

In addition, when the abutment wall 40 is installed connected to the foundation 12 through this structure, and then the slab 100 is constructed on the girder 100 as shown in FIG. 7, the elastic pad when the bending moment of the abutment wall 40 occurs (16) absorbs some displacement, so that damage to the junction where the abutment wall 40 and the foundation 12 come into contact can be prevented.

Looking at the connection structure made through the separate pouring connection construction method of the alternating wall and the foundation, as shown in FIG. (12) is installed in the ground, one end is embedded and fixed to the concrete layer of the foundation 12, and the other end is installed at a certain height from the bottom of the alternating wall self-supporting groove 121. The foundation shear connector unit 14 is installed. And, an elastic pad 16 made of rubber or EVA in a plate shape is installed on the bottom of the alternating wall self-supporting groove 121, and both ends of the elastic pad 16 and the vertical inner surface of the alternating wall self-supporting groove 121 An outer ordering material 17 is installed between them, and an inner ordering material 18 having a waterproof function and a stretch function is installed at the corner where the outside ordering material 17 and the elastic pad 16 meet, and the foundation 12 The alternating wall reinforcing bars 20 are assembled and installed so as to be connected to the foundation shear connector unit 14 upward of the alternating wall self-supporting groove 121, and the cast-in-place concrete is synthesized on the alternating wall reinforcing bars 20 to form the alternating wall 40 is installed

The present invention is constructed by the above-described connection construction method, and as shown in FIG. 7, a slab (rigidly coupled girder or composite girder) 100 is installed on the top of the alternating walls (40 and 40) facing each other, and occurs on the foundation 12 It is possible to construct a ramen bridge 10 in which the bending moment is minimized.

So far, the present invention has been described in detail with reference to the presented embodiments, but those skilled in the art can make various modifications and variations without departing from the technical spirit of the present invention with reference to the presented embodiments. will be. The present invention is not limited by these variations and modifications, but is limited only by the claims appended below.

12: foundation
121: self-supporting home
14: foundation shear connector unit
141: foundation steel
142 stirrup bar
143: longitudinal rebar
16: elastic pad
17: outer order material
18: inner liner
20: alternating wall rebar
40: alternating wall

Claims (9)

(a) manufacturing a foundation shear connector unit 14 that is installed on the foundation 12 and connects the abutment wall 40;
(b) constructing a foundation 12 having the foundation shear connector unit 14 located and installed in an alternating wall self-supporting groove 121 recessed to a predetermined depth along the width direction on the upper surface of the foundation 12; and ;
(c) installing a plate-shaped elastic pad 16 made of rubber or EVA on the bottom surface of the alternating wall self-supporting groove 121;
(d) assembling the alternating wall reinforcing bars 20 upward of the alternating wall self-supporting groove 121 on the foundation 12;
(e) installing the formwork 200 around the alternating wall reinforcement 20 and then constructing the alternating wall 40 by pouring on-site concrete;
In the step (a), the foundation shear connector unit 14 includes a foundation steel member 141 having a lower flange 141a and a web 141b by an I-shaped or ⊥-shaped cross section, and a web 141b of the foundation steel member 141 ) Stirrup reinforcing bars 142 joined to form an L shape at regular intervals on both sides, and longitudinal reinforcing bars 143 bonded to the stirrup reinforcing bars 142 to be connected to the wall main reinforcing bars 202,
In the step (b), the lower flange 141a on one end of the foundation shear connector unit 14 is embedded in the concrete layer of the foundation 12, and the other end of the stirrup bar 142 and the longitudinal reinforcing bar 143 ) is exposed above the alternating wall self-supporting groove 121,
In the step (c), the outer ordering material 17 is installed between both ends of the elastic pad 16 and the vertical inner surface of the alternating wall self-supporting groove 121, respectively, and the outer ordering material 17 and the elastic pad 16 ) In the corner where the ) meets, the inner order member 18 having a waterproof function and a stretch function is installed. delete delete delete According to claim 1,
In the step (d), the wall connection steel form 22 for girder connection is further installed on the upper part of the alternating wall reinforcement 20. According to claim 1,
In the step (d), the wall connecting steel anchor 24 is installed on the upper part of the alternating wall rebar 20, and after curing the cast-in-place concrete or demolding the formwork 200, the wall connecting steel anchor 24 is attached to the wall Separate casting connection construction method of the alternating wall and the foundation, characterized in that the connecting steel type 22 is connected and installed. A foundation 12 having an alternating wall self-supporting groove 121 recessed to a certain depth along the width direction on the upper surface is installed in the ground,
A foundation shear connector unit 14 is installed, one end of which is embedded and fixed to the concrete layer of the foundation 12 and the other end rises at a certain height from the bottom of the alternating wall self-supporting groove 121 and is located,
An elastic pad 16 made in a plate shape made of rubber or EVA is installed on the bottom of the alternating wall self-supporting groove 121, and between both ends of the elastic pad 16 and the vertical inner surface of the alternating wall self-supporting groove 121 Each outer order member 17 is installed, and an inner order member 18 having a waterproof function and a stretch function is installed at the corner where the outer order member 17 and the elastic pad 16 meet,
Alternate wall reinforcing bars 20 are assembled and installed in the foundation 12 to be connected to the foundation shear connector unit 14 upward of the alternate wall self-supporting groove 121,
On-site cast concrete is synthesized on the alternating wall reinforcing bars 20, and the alternating wall 40 is installed,
The foundation shear connector unit 14 has a lower flange 141a and a web 141b by an I-shaped or ⊥-shaped cross section, with a predetermined interval on both sides of the foundation steel member 141 and the web 141b of the foundation steel member 141 The hinge connection structure of the alternating wall and the foundation, characterized in that it includes a longitudinal reinforcing bar 143 bonded to the stirrup bar 142 to be connected to the bonded stirrup bar 142 and the wall main bar 202. delete A ramen bridge characterized in that it is constructed through the separate pouring connection construction method of the alternate wall and the foundation of claim 1.

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