KR102038311B1 - Conner parts structure of steel composite rahmen bridge and the construction method of the same bridge - Google Patents

Abstract

The present invention relates to an installation structure of a major angle part of a steel composite rigid-frame bridge and a construction method of the steel composite rigid-frame bridge, which are possible to minimize generation of cracks on a major angle part of a pier in which a composite girder integrated with a steel girder and slab concrete to move is strongly bound and safely and efficiently perform construction therefor. The installation structure of a major angle part is installed with a pair of post beams on an upper portion of a wall forming each pier facing each other, is provided with a holding slit on an upper portion of the post beam, allows both end portions of the steel girder to rotate and elastically move and to be respectively held on the holding slit so as to prevent separation by self-weight, and then is formed with the major angle part of a rigid-frame structure by being concrete-placed with the post beam after passing certain time.

Description

Concave structure of steel pipe composite ramen bridge and construction method of steel pipe composite ramen bridge {CONNER PARTS STRUCTURE OF STEEL COMPOSITE RAHMEN BRIDGE AND THE CONSTRUCTION METHOD OF THE SAME BRIDGE}

The present invention relates to a structure and a construction method of a composite ramen bridge using a steel pipe girder, and more specifically, while minimizing the occurrence of cracks in the right corner of the alternating steel girder and the composite girder, which acts as the composite girder is rigid. In addition, the present invention relates to the installation structure of the right angled part of the steel pipe composite ramen bridge and the construction method of the steel pipe composite ramen bridge so that the construction can be safely and efficiently performed.

In recent years, the construction of bridges, especially sidewalk bridges or temporary bridges, has a beautiful appearance and requires little maintenance on the inside, and the use of steel pipe girders, which greatly reduces the amount of steel used due to its excellent cross-sectional performance, have.

In such bridge structures using steel pipe girders, in order to increase the bending rigidity or shear stiffness of steel pipe girders, concrete is often filled in the steel pipe constituting the steel pipe girder to have a CFT effect or a prestress is introduced by using a tension member.

However, the above CFT effect is generated on the premise that the concrete filled inside the steel pipe is tightly packed, but the concrete filling work is not easy due to the closing property inside the steel pipe, and the reliability of the quality is not high due to the difficulty of checking. In addition, the introduction of prestress using a tension member is not easy, and thus may act as a factor of increase and decrease of air delay and construction cost.

On the other hand, in the case of a ramen bridge, large parent moments are generated in the right corner of the wall, such as an alternating edge of the girder, whereby cracks are easily generated in the right corner. Therefore, in recent years, in order to control the cracks occurring in the right corner of the ramen bridge, a method of placing concrete on the right corner after placing the girder in advance to induce deformation due to its own weight has been proposed.

As an example, there is an invention called 'synthetic type ramen bridge using steel pipe girder and its construction method' published in Korean Patent Publication No. 10-1892073.

The composite type ramen bridge uses a steel pipe girder, and as shown in FIG. 1, a composite span structure in which a steel pipe girder and a reinforced concrete bottom plate are integrally installed between the first and second walls spaced in the axial direction is installed. It has a structure. In the construction of the composite ramen bridge, first, a steel support base is provided on the upper part of the first wall, and a movable support part is provided on the upper part of the second wall, and then one end of the steel pipe is rigidly fastened to the steel support base of the first wall and the other end thereof. It is simply mounted to allow the axial sliding and rotation in the upper portion of the movable support of the second wall.

In this state, the composite span structure has a simple beam structure, and thus the composite span structure can freely deform and deform on the movable support due to its own weight and temperature load. When the deflection of the composite span structure due to the weight is sufficient, the construction of the bridge corners is completed by placing concrete on the rigid support and the movable support.

Therefore, the above-described composite ramen bridge can reduce the cracks generated in the right corner while promoting the efficiency and beautiful appearance of the cross section by the steel pipe girder.

However, in the above-described composite ramen bridge, since one end of the steel pipe girder is rigidly tightened to the first wall from the beginning, it is impossible to expect a decrease in the bending moment at the right corner of the portion, and the deformation of the entire steel pipe girder is performed at one place of the movable support. Since it must be at, the degree of deformation at that position becomes excessive. As a result, a balanced arrangement of girders is not easy.

Furthermore, the work to mount the composite span structure on the first wall and the second wall and to solidify the first wall should be carried out in high altitude while maintaining the suspended state of the composite span structure by the lifting equipment such as a crane and the other end of the steel pipe girder. Since it is to be placed without any restraint on the upper portion of the second wall, there is a problem that the risk of occurrence of safety accidents of workers, such as felling is high, as well as the equipment fee is increased.

KR 10-1892073 B1

The present invention is to solve the above problems of the prior art, while maintaining the advantages, such as the efficiency of the cross section of the steel pipe girders, beautiful appearance, etc. can be efficiently made reinforcement, the deformation of the steel pipe girders is balanced In addition, to provide a steel pipe composite ramen bridge and its construction method to ensure a stable working environment of the worker by making the steel pipe girder stable mounting state.

According to the most preferred embodiment of the present invention for solving the above problems, as a ramen bridge in which steel pipe girders are installed, a pair of post beams are provided on an upper part of the walls constituting alternating sides, and the post beams Mounting slit is provided on the upper part, and both ends of the steel pipe girder can be rotated and stretched, but each is mounted on the mounting slit so as to be prevented from being separated by its own weight. The right angle installation structure of the steel pipe composite ramen bridge is provided, characterized in that the right angle portion is formed.

At this time, the steel pipe girder is divided into a semi-circular steel pipe portion of both ends consisting of a circular steel pipe portion of the central portion consisting of a circular cross-section and the lower steel cross-section of the circular steel pipe is divided into two, the upper flange and the web in the open portion of the semi-circular steel pipe portion T-shaped steel is installed, and the through-hole is provided in the web is provided with a mounting rod that is inserted into the mounting slit of the post beam can be efficiently mounted on both ends of the steel pipe girder for the post beam.

In addition, the mounting slit is formed by the inverted T-shape consisting of the insertion slit formed long up and down to insert the mounting rod and the movable slit formed long left and right at the bottom of the insertion slit, so that both ends of the steel pipe girder for the post beam It is possible to keep the mount stable.

According to another embodiment of the present invention, as a method for constructing a ramen bridge, a) a post beam to be installed on the upper part of the wall, and a steel pipe girder on which both ends are mounted on the post beams to be installed on each wall facing each other, The post beam includes a mounting slit including up and down insertion slits and moving slits in left and right directions, and the steel pipe girder is a lower portion of which a circular steel pipe part and a circular steel pipe are bisected at a central portion formed of a circular cross section. Divided into semi-circular steel pipe portions of both ends consisting of a cross-section, the open portion of the semi-circular steel pipe portion is provided with a T-shaped steel consisting of an upper flange and a web, and the web is provided with a through hole into which the mounting rod is inserted, the post beam and the steel pipe girder Production step; b) installing the post beams with mounting slits on opposite walls; c) mounting both ends of the steel pipe girder to the mounting slit so that rotation and expansion and movement can be prevented, but the separation is prevented by its own weight; d) causing deflection and expansion deformation due to the upper load and the temperature load including the self-weight of the steel pipe girder; e) placing concrete between the upper right corner of the wall to stiffen the steel pipe girder and the wall; a method of constructing a steel pipe composite ramen bridge is provided.

At this time, in step e), the concrete pouring on the right angle part and the concrete pouring on the inside of the circular steel pipe part of the steel pipe girder may be performed at the same time to make the CFT structure of the circular steel pipe, and in order to reduce the weight of the steel pipe girder. When manufacturing the steel pipe girder in the installation of the blocking plate between the circular steel pipe portion and the semi-circular steel pipe portion, and when placing concrete in the right corner in step e) may prevent the concrete from flowing in the circular steel pipe portion.

The present invention reduces the bending moment generated in the right corner of the ramen bridge by having a hinge structure using a mounting slit during the construction process to control the cracks generated, the simple mounting work and deformation-inducing work of the steel pipe girder for this It can be done in a stable state so that girder conduction and worker safety accidents that occur frequently during operation are rarely generated.

In addition, the present invention reinforces both ends of the steel pipe girders with T-shaped steel and facilitates the construction management of concrete pouring to the inside and outside of the steel pipe girders to ensure a sufficient reliability of the construction quality for the bridge right corner.

In addition, the present invention can maintain a beautiful appearance suitable for the surrounding environment by exposing the circular section of the steel pipe girder to the outside of the bridge.

1 is a perspective view of a ramen bridge construction method according to the prior art.
2 is a cross-sectional view of the ramen bridge constructed by the present invention.
3 is a cross-sectional view of AA, BB, and CC in FIG. 2.
4 is a perspective view of a steel pipe girder applied to the ramen bridge of the present invention.
5 is a perspective view of a post beam applied to a ramen bridge of the present invention.
FIG. 6 is a perspective view of the steel pipe girder of FIG. 4 mounted on the post beam. FIG.
7 to 11 are each a perspective view and a cross-sectional view of the process of constructing the ramen bridge of the present invention.

Hereinafter, with reference to the accompanying drawings, the most preferred embodiment of the present invention will be described in detail. However, in describing the present invention, when the technical concept of the present invention is obscured or obscured by describing the known configuration in detail, the description of the known configuration will be omitted.

Figure 2 is a cross-sectional view showing the ramen bridge as a whole constructed by the present invention, Figure 3 is a cross-sectional view of each of the AA, BB and CC of Figure 2, Figure 4 is a steel pipe girder applied to the ramen bridge of the present invention 30 is a perspective view of the entirety, FIG. 5 is a perspective view of a post beam 20 installed on the upper portion of the wall 10, and FIG. 6 is a steel pipe girder 30 of FIG. 4 mounted on the post beam 20. It is a perspective view which showed the state made.

The present invention is to ensure that the reinforcement to the point portion can be efficiently made while still having the various advantages that the steel pipe girders 30 as a bridge of the ramen structure. That is, the present invention is to expose the appearance of the steel pipe girders 30 in the span portion inside the bridge to the girder as shown in Figures 2 and 3, so that the beauty of the appearance can be maintained as it is, the moment and shear force is large At the point of the bridge, having the structure synthesized with concrete, the steel pipe girder 30 has an efficient cross-sectional structure by reducing the magnitude of their stress or through reinforcement.

Steel pipe girder 30 of the present invention for this purpose, as shown in Figure 4, the circular steel pipe portion 30A of the central portion to be located in the span portion of the bridge, and the semi-circular of both ends located in the point portion of the bridge It consists of a steel pipe part 30B.

The circular steel pipe portion 30A is made of a circular cross section, except for the portion synthesized with the upper concrete 40, as shown in Figure 3 (a) is exposed to the outside to have a beautiful appearance.

On the contrary, the semi-circular steel pipe part 30B may have an SRC structure having high bending and shear stiffness while being embedded in concrete. More specifically, the semi-circular steel pipe part (30B) is made of a circular steel pipe is bisected at both ends of the circular steel pipe portion (30A) to be made of a lower cross-section open top, so that the concrete filling to the interior can be made tightly. In addition, by installing the T-shaped steel 31 consisting of the upper flange 31a and the web 31b in the open portion of the semi-circular steel pipe portion 30B to maximize the bending rigidity as well as the shear rigidity.

On the other hand, the present invention enables minimization of cracks in the corners of the point frequently occurring in the ramen structure.

That is, in the present invention, the steel pipe girder 30 is simply mounted on an alternating state in which the deformation by the weight of the steel pipe girder 30 and the top concrete 40 is completed, that is, the steel pipe girder 30 and the top concrete By placing concrete against the right angled part of the ramen structure in a state where the moment is not generated by the self-weight of (40), the right angled part bears only the bending moment generated by the working load of the bridge.

To this end, two sets of post beams 20 are installed on the upper portions of the walls 10 constituting the alternating sides opposite to each other, and a mount capable of mounting the steel pipe girder 30 on the upper portions of the post beams 20. The slit 21 is provided.

The steel pipe girders 30 mounted on the post beam 20 allow both ends of the pipe girder 30 to be rotatable and stretchable, but in the present invention, separation from the post beam 20 is prevented by the weight of the steel pipe girder 30. Has a structure.

That is, according to the present invention, once the steel pipe girder 30 is once mounted on the mounting slit 21, the steel pipe girder 30 may be removed from the mounting slit 21 even if any external force is applied, unless the steel pipe girder 30 is lifted upward. 30) should not be dismissed. Therefore, during the process of mounting the steel pipe girder 30 to the post beam 20, or during the process of being maintained so that the end of rotation and expansion movement deformation of the end after the steel pipe girder 30 is mounted on the post beam 20 Even if the load acts on the steel pipe girder 30, there is no room for problems such as the steel pipe girder 30 is conducted or out of the mounting point. In addition, even if the top plate concrete 40, except the right corner portion is placed on-site, the mounting state of the steel pipe girder 30 is kept stable, thereby ensuring sufficient efficiency and safety of work.

The mounting structure of the steel pipe girder 30, as shown in Figure 5, the mounting slit 21 provided in the post beam 20 is formed at the lower end of the insertion slit 21a and the insertion slit 21a long vertically It consists of a moving slit 21b formed to the left and right to have an inverted T shape, and through holes in the web 31b of the T-shaped steel 31 installed at both ends of the steel pipe girder 30 as shown in FIG. 6. After forming (h), the mounting rod 32 is inserted into the through hole h, and both ends of the mounting rod 32 inserted into the through hole h are mounted through slits of the post beam 20. 21) by inserting into the mount.

The mounting rod 32 inserted through the insertion slit 21a of the post beam 20 is placed on the bottom surface of the moving slit 21b by the weight of the steel pipe girder 30 to move or rotate the pivot shaft at the end of the steel pipe girder 30. By acting as an axis to facilitate the rotation and horizontal movement of the end of the steel pipe girders (30). The upper surface of the movable slit 21b prevents the mounting rod 32 from being separated.

The steel pipe girders 30 mounted on the post beams 20 on both sides through the mounting slit 21 are cast in concrete together with the post beams 20 after a certain time has elapsed, such as sufficient deflection. Form the right side. Therefore, as described above, the right angle part bears only the bending moment generated by the working load of the bridge, thereby minimizing the occurrence of cracking and optimizing the cross section, thereby achieving an economical bridge structure.

7 to 11 illustrate the steps of constructing a ramen bridge by the method according to an embodiment of the present invention, which is a) manufacturing a steel pipe girder 30 and a post beam 20, b) Installing the post beam 20, c) mounting the steel pipe girder 30, d) causing sagging and stretching deformation, e) hardening the steel pipe girder 30, Explained as follows.

a) manufacturing a steel pipe girder 30 and a post beam 20 (FIG. 7);

First, the post beam 20 and the steel pipe girder 30 having a shape capable of implementing the right angle installation structure of the present invention are manufactured and prepared.

Each post beam 20 to be installed on the top of the wall 10 is provided with a mounting slit 21 consisting of an insertion slit 21a in the vertical direction and a movable slit 21b in the left and right directions.

At this time, the up and down insertion slit 21a provided in each of the post beams 20 to face each other in the wall 10 facing each other may have the same vertical shape, but the separation rod 32 is more difficult to remove One may be provided in a vertical shape, and the other may be provided in an inclined shape.

A steel pipe girder 30 having both ends mounted on the post beams 20 installed on the walls 10 facing each other along with the post beams 20 is manufactured.

The steel pipe girder 30, as described above, the semi-circular steel pipe portion (30B) of both ends consisting of a circular steel pipe portion 30A of the central portion consisting of a circular cross-section and the lower steel cross-section of the circular steel pipe is bisected and opened at the top. Is done.

In addition, the open portion of the semi-circular steel pipe portion 30B is provided with a T-shaped steel 31 consisting of an upper flange 31a and a web 31b, and a through hole into which the mounting rod 32 is inserted into the web 31b. (h) is provided.

Of course, in this step, the mounting rod 32 may be inserted and fixed in advance in the through hole h. Alternatively, the web of the mounting rod 32 may be cut in its position without installing the through hole h. It is also possible to fix the welding so as to protrude to both sides of 31b), which can be said to be substantially the same configuration.

b) installing the post beam 20 (FIG. 8);

When the manufacturing of the post beam 20 provided with the mounting slit 21 is completed, the post beam 20 is installed on the wall 10 constituting the alternating facing each other. At this time, the post beam 20 should be installed in each wall 10 by using a set of two, the mounting slits 21 provided in the set of these post beam 20 should have the same shape.

On the other hand, the insertion slit 21a of each of the post beams 20 installed on the wall 10 facing each other can be provided in one side in a vertical shape and the other side in an inclined shape. As shown.

c) mounting the steel pipe girder 30 (Fig. 9);

When the installation of the post beam 20 for each wall 10 is completed, the steel pipe girder 30 produced in step a) is simply mounted on both post beams 20.

Both ends of the steel pipe girder (30) mounted in this step should be made to be freely rotated and stretched movement while being prevented from leaving by its own weight.

To this end, the mounting rod 32 is inserted into the through hole h of the T-shaped steel 31 web 31b so that both ends of the mounting rod 32 protrude to both sides of the web 31b. Both ends of the mounting rod 32 are simultaneously inserted into the insertion slits 21a of each of the beams 20 so as to be placed on the bottom surface of the movable slits 21b formed from side to side.

When the insertion slit 21a provided in any one of the post beams 20 of the walls 10 facing each other is configured to have an inclined shape, the inclined insertion slit among the ends of the steel pipe girder 30 is provided. The end of the steel pipe girder 30 on the side 21a is first mounted on the mounting slit 21, and then the end of the steel pipe girder 30 on the side of the vertical insertion slit 21a is mounted on the mounting slit 21.

As a result, the steel pipe girder 30 has a simple beam structure so that rotation and expansion and movement are free and the stability of the mounting state is completely secured, thereby enabling safe and efficient subsequent work without additional equipment or means.

d) causing sagging and elastic deformation (FIG. 10);

When the simple mounting of the steel pipe girder 30 to the post beam 20 is completed, it causes sagging and stretching deformation due to the upper load and the temperature load including its own weight.

In this step, the top plate concrete 40 may be poured on the upper portion of the steel pipe girder 30, but rather, the top plate concrete 40 is poured in advance while the steel pipe girder 30 is produced in step a). 30) It is desirable to reduce the work process on the site by forming a PC member composited with the top concrete 40.

Of course, even if the top plate concrete 40 is cast in the present method, at least the end portion of the steel pipe girder 30 mounted on the post beam 20 is left as it is without concrete pouring and sag of the steel pipe girder 30 is maintained. It should be done smoothly.

e) hardening the steel pipe girder 30 (FIG. 11);

When the deformation of the steel pipe girder 30 is finished after a certain period of time, the steel pipe girder 30 and the wall 10 between the steel pipe girder 30 and the wall 10 by casting concrete to the right angle of the upper portion of the wall 10 including the end of the steel pipe girder 30 Be sure to

At this time, by placing concrete at the same time for the interior of the circular steel pipe portion 30A of the steel pipe girder 30, the circular steel pipe portion 30A by the CFT structure to improve the structural performance, such as flexural rigidity, vibration resistance, fire resistance have. Of course, the CFT structure of the circular steel pipe portion (30A) can be made before this step.

On the contrary, when the concrete is poured into the right corner portion, the concrete may not be flowed into the circular steel pipe portion 30A, thereby reducing the weight of the steel pipe girder 30. To this end, when the steel pipe girder 30 is manufactured in step a), the blocking plate 33 is installed in advance between the circular steel pipe part 30A and the semi-circular steel pipe part 30B.

The present invention has been described in detail above with reference to specific embodiments, but the above embodiments are merely examples for easy understanding of the present invention, so that those skilled in the art have the scope of the technical idea of the present invention. It will be apparent that various modifications can be made within the scope of the invention. Therefore, such modifications will be described within the scope of the present invention as described in the claims.

10; Wall 20; Post beam
21; Hang slits 21a; Insertion Slit
21b; Moving slit 30; Steel pipe girder
30A; Round steel pipe section 30B; Semi-circular steel pipe
31; T-beam 31a; Upper flange
31b; Web 32; Mounting rod
33; Blocking plate 40; Top Concrete
h; Through hole

Claims (6)

In the structure of the ramen bridge using a steel pipe girder,
A pair of post beams 20 are provided on an upper portion of the wall 10 constituting the alternating opposite to each other, a mounting slit 21 is provided on the post beams 20,
Both ends of the steel pipe girder 30 can be rotated and stretched, but each is mounted on the mounting slit 21 so as to be prevented from being separated by its own weight, and after a predetermined time, concrete is poured with the post beam 20 to provide a ramen structure. As the right corner of is formed,
The steel pipe girder 30 is divided into a semi-circular steel pipe portion (30B) of both ends consisting of a circular steel pipe portion (30A) of the central portion consisting of a circular cross-section and a lower half cross-section with a circular steel pipe divided into two, the semi-circular steel pipe portion An open portion of the 30B is provided with a T-shaped steel 31 formed of an upper flange 31a and a web 31b, and a through hole h is provided in the web 31b to mount the post beam 20. Mounting rod 32 is inserted into the slit 21 is installed,
The mounting slit 21 is an inverted T-type consisting of an insertion slit 21a formed vertically long to allow the mounting rod 32 to be inserted and a movable slit 21b longly formed at the lower end of the insertion slit 21a. Right angle installation structure of steel pipe composite ramen bridge, characterized in that configured in the shape. delete delete In how to construct a ramen bridge,
a) to produce a post-beam 20 to be installed on the upper part of the wall 10 and the steel pipe girders 30, both ends of which are mounted on each of the post-beams 20 provided on each of the walls 10 facing each other,
The post beam 20 is provided with a mounting slit 21 having an inverted T shape, which is composed of an insertion slit 21a in the vertical direction and a movable slit 21b in the horizontal direction.
The steel pipe girder 30 is divided into a semi-circular steel pipe portion 30B at both ends consisting of a circular steel pipe portion 30A of a central portion formed of a circular cross section and a lower cross-section of which the circular steel pipe is bisected and opened at an upper portion thereof. On the open part of the steel pipe part 30B, a T beam 31 consisting of an upper flange 31a and a web 31b is provided, and the post beam 31b is provided with mounting bars 32 on both sides. 20 and the manufacturing step of the steel pipe girder 30;
b) installing the post beam 20 provided with the mounting slit 21 on opposite walls 10;
c) Insert both ends of the mounting rod 32 into the insertion slit (21a) at the same time to be placed on the lower surface of the movable slit (21b) formed to the left and right to rotate and stretch movement, but the steel pipe girder to prevent the separation by its own weight Mounting both ends of the mount 30 to the mounting slit 21;
d) causing deflection and stretching deformation due to the upper load and the temperature load including the self-weight of the steel pipe girder 30;
e) pouring concrete to the right corner of the upper part of the wall (10) to harden the steel pipe girder (30) and the wall (10); the construction method of steel pipe composite ramen bridge, characterized in that consisting of. The method of claim 4, wherein
In the step e), the construction of the steel pipe composite ramen bridge, characterized in that the concrete casting on the inside of the circular steel pipe portion (30A) of the concrete casting and the steel pipe girders (30) at the same time. The method of claim 4, wherein
When the steel pipe girder 30 is manufactured in the step a), the blocking plate 33 is installed between the circular steel pipe part 30A and the semi-circular steel pipe part 30B, and when the concrete is poured into the right corner part in the step e), Steel pipe portion (30A) construction method of the steel pipe composite ramen bridge, characterized in that the concrete does not flow.

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