KR200245129Y1 - Steel bridge with widely spaced girder - Google Patents

Abstract

The present invention relates to a small-moulded plate-shaped bridge that is easy to construct and maintain by combining a mold and a precast top plate by a non-synthetic combination using a rubber bearing in joining the bridge mold and the precast bottom plate.

The present invention is a minor mold plate bridge using a precast bottom plate member placed on the mold of the bridge, a plurality of rubber bearings are fixedly fixed on the upper flange of the mold at regular intervals, the precast bottom plate is the rubber It is installed on the base, characterized in that the connection between the precast bottom plate and the mold by a connection member for easy separation.

Description

Steel bridge with widely spaced girder

The present invention relates to a minor mold plate bridge having a non-synthetic precast deck, and more particularly, a minor mold plate bridge which combines a precast bottom plate with a non-synthetic method in a bridge mold to facilitate construction and maintenance. It is about.

Minor cast plate bridges, which are generally constructed, take the form of composite structures that combine the mold and the bottom plate with shear connectors. Synthetic type has advantages in terms of reinforcement of molds compared to non-synthetic type, but in most cases, only the bottom plate is repaired, reinforced or replaced due to shorter concrete life compared to steel. In this case, the repair, reinforcement, and replacement of the composite structure requires a long period of traffic control due to the long construction period, which further exacerbates poor urban traffic problems and is developing into a serious social problem.

Therefore, the present invention is to solve the problems of the prior art as described above, the object of the present invention is to combine the mold of the bridge and the precast bottom plate, using a rubber support to the mold and the precast top plate in a non-synthetic By combining, it is to provide a minor column plate bridge to facilitate the construction and maintenance.

1 is an exploded perspective view showing the entire structure of a minor casting plate-shaped bridge according to the present invention.

Figure 2a is a cutaway perspective view of an example showing a connection state between the bottom plate and the mold of the minor casting plate bridge according to the present invention.

Fig. 2B is a sectional view of Fig. 2A.

Figure 3a is a cutaway perspective view of another example showing the connection state between the bottom plate and the mold of the minor mold plate bridge according to the present invention.

3B is a cross sectional view of FIG. 3A;

* Explanation of symbols for main parts of the drawings

11: mold 12: precast bottom plate

13: rubber base 14: through hole

The present invention for achieving the above object is, in a minor mold plate bridge using a precast bottom plate member placed on the mold of the bridge, a plurality of rubber feet are fixedly coupled to the upper flange of the mold at regular intervals, A precast bottom plate is installed on the rubber support, and the precast bottom plate and the mold are connected by a connection member to facilitate separation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is an exploded perspective view showing the entire structure of a minor mold plate bridge according to the present invention, Figure 2a is a cutaway perspective view of an example showing the connection state between the bottom plate and the mold of the minor mold plate bridge according to the present invention, Figure 2b is Figure 2a 3A is a cutaway perspective view showing another example of the connection state between the bottom plate and the mold of the minor casting plate-shaped bridge according to the present invention, and FIG. 3B is a sectional view of FIG. 3A.

As shown in FIG. 1, the minor casting plate-shaped bridge according to the present invention attaches a rubber support 13 to the mold 11 at a predetermined interval, and then precasts the bottom plate 12 on the rubber support 13. Settle down. In addition, a through hole 14 is formed at a position of the precast bottom plate 12 corresponding to the rubber support 13, and the precast bottom plate 12 is cast through the through hole 14. And 11) in a non-synthetic connection. Then, the connection between the precast bottom plate 12 using a general connection member.

The non-synthetic connection method between the mold 11 and the precast bottom plate 12 will be described with reference to Figs. 2A to 3B.

The most important thing in the present invention is the connection between the mold 11 and the precast deck 12. The connection of the precast bottom plate 12 and the mold 11 should be able to ensure structural stability during common use as well as easy dismantling of the bottom plate during maintenance.

Figures 2a and 2b show how the bolt and the mold and the precast bottom plate are combined.

The non-synthetic structure should be made to bear the rubber bearings due to the difference in the amount of expansion and contraction of the mold 11 and the bottom plate 12. At this time, the connecting member connecting the mold 11 and the bottom plate 12 should also be a structure that can allow such a step. This is because the support part of the precast bottom plate disappears when the connecting member 21 is damaged. In order to solve this problem, in the present invention, when the connecting member 21 is installed, the mold 11 and the connecting member 21 are fixed to the hinge structure. In other words, when the amount of expansion and contraction occurs, the hinge of the connection part is rotated, thereby preventing the occurrence of negative static force, thereby ensuring the stability of the connection member.

This will be described in more detail with reference to the drawings.

As shown in Figs. 2A and 2B, the rubber feet 13 are attached on the upper flange of the mold. Here, the method of attaching the rubber support 13 to the mold generally uses an adhesive method. However, when the steel plates are attached to both sides of the rubber support 13, the rubber support 13 may be attached to the mold by welding or the like. In addition, a hole is formed in the center portion of the rubber support 13, and the connecting member 21 is inserted through the hole of the rubber support, so that one end of the connecting member 21 is hinged to the upper flange of the mold ( 23). Since the hinge coupling is the same as a general hinge coupling, a detailed description thereof will be omitted. A thread is formed on the other end side of the connecting member. On the other hand, a hole 22 for penetrating the connection member 21 is formed in the precast bottom plate at a position corresponding to the rubber base 13 attached to the mold. Thus, the connecting member 21 is inserted into the through hole 22, the threaded portion of the connecting member 21 is exposed upward, and tightens the nut 24 to the thread. To this end, the upper portion of the through hole 22 is formed with a groove to have a larger area than the through hole in order to facilitate fastening of the nut 24. On the other hand, the nut 24 completely blocks the through hole 22, as shown in FIG. 2A, and when the backfill 25 of the groove of the precast bottom plate is later filled with concrete, concrete passes through the through hole 22. Do not go inside. In addition, the inside of the through-hole 22 is filled with wax, thereby minimizing the friction between the connection member 21 and the precast bottom plate according to the movement of the bottom plate. On the other hand, the contact surface of the rubber support 13 and the precast bottom plate 12 is just put the precast bottom plate 12 on the rubber support 13 without any special treatment. Of course, it can also be glued as needed.

Meanwhile, another connection method among the methods of combining the mold 11 and the precast bottom plate 12 will be described with reference to FIGS. 3A and 3B.

As described above, the rubber support 13 is attached to the upper portion of the flange of the mold 11, and the attachment method by welding or when the steel plate 31 is attached to the rubber support by the attachment method. Can be used. In the drawings, the case where the steel plate 31 is attached to the rubber support 13 is shown as an example. In addition, a connection member 33 is embedded in a lower portion of the precast bottom plate corresponding to the attached rubber support 13. That is, a plurality of connection members 33 are fixedly bonded to one side of the steel plate 32. When manufacturing the precast bottom plate, the steel sheet 32 to which the connecting member is fixed is interposed. As a result, when the precast bottom plate is placed on the rubber base 13, the steel plate 32 formed integrally with the lower part of the precast bottom plate is placed on the rubber base 13, and the steel plate 32 and Bonding between the rubber feet 13 by an adhesive method.

On the other hand, the coupling between the precast bottom plate is generally using a connection method used in the tunnel lining method, there may be a slope bolt method, bolt box method, connecting pin assembly rod coupling method, etc. , Detailed description thereof will be omitted.

On the other hand, in the case of the non-synthetic bottom plate due to the difference in the linear expansion coefficient of the bottom plate and the steel mold according to the temperature change, the difference in the amount of expansion occurs, which is burdened by the base plate support. Therefore, it is necessary to set an appropriate specification of the rubber support to ensure sufficient stability against temperature changes.

To examine this, as an example, the difference between the amount of expansion and contraction due to temperature by applying the interval of 40m and the mold height of 2.0m is as follows.

The coefficient of linear expansion of concrete The linear expansion coefficient of steel to be. Here, assuming that the temperature change is 30 ℃, the difference in the amount of expansion and contraction of the concrete and steel of the bridge having a distance of 40m is shown in Equation 1.

The difference in the amount of movement in the base is (2.4 / 2 = 1.2mm).

And, the difference in the amount of expansion due to live load is as follows.

As of 1996, the angle of rotation of the mold by live load was 1/300, and the difference in the amount of expansion and contraction between the mold and the bottom plate by live load was (1/300 × 2/3 × 2550 = 5.67mm). Therefore, the difference in expansion amount by (temperature + live load) is (1.2 + 5.67 = 6.87mm).

The allowable displacement of the rubber bearing is generally about 2/3 times the height of the bearing. Therefore, when the effective thickness of the rubber is applied to 10.3mm or more (which is 6.87 × 3/2), the rubber is stable against temperature and live load activity. In the embodiment of the present invention, the rubber base has a height of 80 mm, thereby ensuring a sufficient allowable displacement amount.

According to the present invention configured as described above, by combining the mold and the precast bottom plate in a non-synthetic by using a rubber base, it is easy to replace the bottom plate during maintenance, excellent work efficiency by using a ready-made product during construction, There is an effect that the member is simplified by not using a shear connector.

Claims (3)

In the minor casting plate-shaped bridge using the precast deck plate member placed on the mold of the bridge, On the upper flange of the mold a plurality of rubber feet are fixedly coupled at regular intervals, The precast bottom plate is installed on the rubber support, minor cast plate bridge, characterized in that connected between the precast bottom plate and the mold by a connection member for easy separation. The method of claim 1, The connecting member, One end is interposed through the first through hole formed in the rubber support and is hinged to the upper flange of the mold, and the other end includes a bolt formed with a thread, the bolt is formed on the precast bottom plate A minority plate-shaped bridge, which is inserted through a second through hole and fastened by a nut at an upper portion of the precast bottom plate. The method of claim 1, The connecting member, And a steel plate fixedly coupled to an upper portion of the rubber support, and a plurality of connecting members are fixedly bonded to an upper portion of the steel plate, and the plurality of connecting members are inserted into and integrated into the precast bottom plate. Plate bridge.