KR20040003452A - Prestressed long span precast concrete frame structural system - Google Patents

Abstract

PURPOSE: A prestress long-span precast skeleton structure system is provided to cut down the construction expenses of a building. CONSTITUTION: The prestress long-span precast skeleton structure system comprises a reinforced concrete column(10) provided with a shear groove and a screw(12) to couple with a primary girder(20), a primary girder(20) coupled with the column(10) to support a slab and provided with a shear key to couple the column(10) and the primary girder(20), and a secondary girder coupled between primary girders(20) to support a slab and provided with a hole to interpose a tension member.

Description

Prestressed Long Span Precast Frame Structure System {PRESTRESSED LONG SPAN PRECAST CONCRETE FRAME STRUCTURAL SYSTEM}

The present invention relates to a prestress long span PC frame structure system, and in more detail, a prestress long span for inserting a tensioned prestress PC beam between a PC column and a column to lengthen the span of the PC frame structure system. PC framework structure system.

As the construction demand for cultural facilities, warehouses, discount stores, theatres, and parking lots of long spans is expected to increase, development of construction technology is required. In Korea, steel frame systems have been mainly applied to high-load long span structures, and some of them are precast concrete (PC) framework structures using double tee slabs.

PC frame structure system of the two systems is excellent in economy, durability, workability has many advantages in design and construction. In general, when building a building can be built using reinforced concrete columns and beams to build the building, and by using steel frame can be built to build the columns and beams of the building.

Table 1 is a table showing the characteristics of the steel frame system and the general PC frame structure system.

Item Steel Frame System PC skeleton system Construction cost - 5-15% savings Maintenance and repair on exposure Use of rust preventive-maintenance fee required No maintenance fee Durable - 200% of steel structure systems Aesthetic appearance Damage to the city Beautiful appearance Construction method Air shortening by prefabricated Air shortening by prefabricated Structural effect for 12-20m span Deck Plates and Intermediate Beams Self-weight reduction due to one-way joist slab or perforated slab Usability Low slab stiffness generates noise and rocking Rigid rigidity eliminates noise and increases stability Fire resistance - Better than steel frame with proper coating thickness

Steel structure has the advantages of light weight, strong tensile strength and long distance between spans, but it is expensive and requires a lot of construction cost. It is weak against pressing force and heat and easily transmits vibration. Steel structure is to add a separate reinforcing material between the steel frame to reduce the vibration to live in a comfortable environment. Therefore, the process becomes complicated and the construction cost becomes more expensive.

Buildings such as cultural facilities, history, gymnasiums, discount stores, libraries and museums are essential to the city and used by many people. Since buildings such as museums have to have a long distance between the pillars and the pillars, the buildings are constructed using steel structures. Therefore, the construction cost of such a building becomes expensive, it is impossible to construct an appropriate number, and the use cost may increase due to an increase in construction cost, which causes a problem that many people cannot easily use.

In addition, recently, theaters have increased the number of complex theaters, and the effects of sound in films have increased, so if you build a theater using steel structures, you can hear the sounds of other theaters or people waiting to watch in the waiting room. There is a problem that causes difficulties in watching movies.

The general PC frame system is low in construction cost and resistant to noise and vibration, but the distance between the pillars and the pillars is shorter than that of the steel structure, so it is not suitable for buildings such as cultural facilities, history, gymnasiums, discount stores, libraries and museums. In order to solve this problem, the construction of buildings using long span PC frame systems has been studied.

Such long span PC frame systems include steel composite technology and double tee slab systems.

The steel composite construction method can be applied up to 20M in simple support by using both ends of steel beams as PC, but it could not overcome the steel frame in efficiency such as span / depth and self-weight, and all the intermediate beams on the center steel part should use the steel frame. The effect of lowering the construction cost will not occur.

The double tee slab system is expected to be used in large discount store buildings, and effective cross section and reinforcement have been proposed, but there are limitations to the application of buildings with a simple support and a span of more than 15M for transportation reasons.

Therefore, the present invention was created to solve the problems of the prior art, an object of the present invention by adding another beam to the beam introduced tension in the reinforced concrete structure to hold the slab using reinforced concrete columns and beams It is easy to produce, transport, assemble, and construct by extending the length of the beam, and the gap between pillars is long, so that it can be applied to buildings with long spans such as cultural facilities, history, and discount stores. It is to provide a prestressed long span PC frame structure system.

Accordingly, in order to achieve the above object, the prestressed long span PC frame structure system according to the present invention includes a reinforced concrete column having a first through hole of a predetermined size; A first beam having a second through hole of a predetermined size and coupled to an upper portion of the reinforced concrete column, the first through hole and the second through hole communicating with each other, and having a “b” shape on the opposite side of the surface engaging with the column; A first tension member penetrating the column and the first beam through the first through hole and the second through hole; And a second tension member having a third through hole of a predetermined size and having a second tension member inserted into the third through hole, the second beam having a "-" shape at both ends, and the second beam being configured between the two first beams. It is characterized by.

1 is a view showing an embodiment of a prestressed long span PC frame structure system according to the present invention.

Figure 2 is a view showing an embodiment of the pillar of the prestressed long span PC frame structure system according to the present invention.

3 is a view showing an embodiment of the first beam coupled to the pillar of the prestressed long span PC frame structure system according to the present invention.

4 is a view showing an embodiment of a second beam coupled between the first beam coupled to the pillar of the prestressed long span PC frame structure system according to the present invention.

5 is a view showing that the second beam according to the present invention is in a stress (Prestress).

6 is a view showing a coupling portion of the first beam and the second beam according to the present invention.

7 is a view showing an embodiment of the second beam used in the prestressed long span PC frame structure system according to the present invention.

8 is a diagram illustrating a procedure for constructing a prestressed long span PC frame structure system according to the present invention.

The present invention will be understood from the following description in comparison with the prior art, with reference to the accompanying drawings.

1 to 4 is a diagram showing an embodiment of a prestressed long span PC frame structure system according to the present invention. Referring to Figures 1 to 4, the prestressed long span PC frame structure system is coupled between the column 10, the first beam 20 and the first beam 20 to be coupled to the column 10, the slab And a second beam 30 forming a complete beam to support it.

The pillar 10 may be manufactured using reinforced concrete and may use a precast structure that is manufactured in advance in a field production or a factory. As shown in FIG. 2, the pillar 10 has a predetermined sheer groove 11 at a portion to which the first beam 20 is coupled, such that the first beam 20 is coupled to the shear groove 11. Then, a screw 12 having a predetermined thickness is embedded in the upper end of the pillar and the sheath groove 11 so as to couple the pillar 10 and the first beam 20. The screw 12 allows the first beam 11 and the column 10 to be coupled.

Moreover, the hole 14 of constant thickness penetrates the pillar 10 at the upper end of the shear groove 11 of the pillar 10.

The first beam 20 is a part that is fitted to the shear grooves 11 of the pillar 10 and serves to support the slab by being combined with the pillar. The structure may be used.

The first beam 20 is manufactured as shown in FIG. 3, and the bottom of the sheer key 24 and the sheer key 24 is formed at a cross section which is in contact with the pillar 10, and the first beam 20 is formed. The iron plate is made to be attached to match the outer wall of the groove so that a certain working space 25 is formed in the first beam 20 by the groove and the iron plate so that the iron plate is fixed to the column 10 using the screw 12. . The iron plate is formed with a hole through which the screw 12 can pass. The sheer key 24 is configured to correspond to the sheer groove 11 formed in the pillar 10 so that the pillar 10 and the first beam 20 can be easily coupled. Then, the opposite side of the surface in contact with the pillar 20 is a "b" shaped to facilitate coupling with the second beam (30). At the end of the “b” shape, the beams 20 and 30 can be joined to a desired shape without being broken in the process of joining the first beam 20 and the second beam 30, and the first beam can be joined by a heavy load. In order to prevent the cross section between the beam 20 and the second beam 30 from being damaged, an iron plate having an “a” shape is buried in the cross section where the first beam 20 is in contact with the second beam 30. have.

The sheer key 24 of the first beam 20 is aligned with the sheer groove 11 of the pillar 10, and the first beam 20 is attached to the pillar 10 using an epoxy resin. The screw 12 embedded in the pillar 10 is exposed to the outside through the groove 25 of the first beam 20 so as to put a hand in the groove 25 to engage with the female screw to the first beam 20. Fix the lower part of the column 10. And, the upper portion of the first beam 20 is fixed using the hinge 40. In the upper portion of the first beam 20 and the pillar 10, screw grooves 13 and 23 are formed to fix the hinge 40, respectively. In addition, a hole penetrating the first beam 20 is formed in the first beam 20.

When the first beam 20 is attached to the column 10, the positions of the holes 10 and the holes 14 and 21 formed in the first beam 20 coincide with each other. Up to 20) a constant tube is formed. After inserting the tension member in such a tube, the tension member is pulled tight to be tensioned, and the tension member is fixed using the fixing means. Therefore, tension is applied to the first beam 20 by the tension member so that the first beam 20 can withstand a greater load than the general reinforced concrete structure. The work that causes the tension material to grow is called a prestress process.

Pre-tension process involves pre-tension process that inserts tension material after joining and then pulls it out, and then tensions by purchasing tension material before placing concrete during post-tension process and member production.

As shown in FIG. 4, the second beam 30 is formed in a form in which both ends thereof correspond to the “b” shape of the first beam 20 so that the second beam 30 is connected to the first beam 20. To be combined. The second beam 30 is manufactured so that a hole into which the tension member is inserted is formed at the lower end, and the tension member embedded in the hole may be tense before the second beam 30 is manufactured or tensioned after the production. As the tensioned and stretched tension material is retracted to restore the original shape again, the second beam 30 acts as a compressive force as shown in FIG. 5 to exert a greater flexural strength. After the process of pulling the tension member is completed, the second beam 30 is coupled with the first beam 20. Therefore, the distance between the pillar 10 and the pillar 10 of the building is longer than the general PC frame structure by the first beam 20 and the second beam 30 and the first beam 20 and the second beam Since it is produced by segmenting the beam 30, there are many advantages in transporting the PC, and it is possible to connect and assemble the segmented first beam 20 and the second beam 30 in the field so that the structure of the long span is possible. do.

The second beam 30 is selected according to the work site during the post-tension process and the pre-tension process to apply tension to the second beam 30.

The bending stress of the first beam 20 and the second beam 30 is increased by effectively introducing a prestress process at a structurally advantageous position so that the first beam 20 and the second beam 30 have a long span structure. To withstand the heavy loads applied from the top.

In addition, as shown in FIG. 6, the first beam 20 and the second beam 30 are coupled to the coupling portion where the first beam 20 and the second beam 30 are coupled, while the coupling operation is convenient. There is a certain gap is formed to protect the coupling part of the), after filling the gap is filled with a filler to secure the coupling of the first beam 20 and the second beam 30, and the fixing device of the first tension member Protect it. In order to fill the filler, the periphery of the gap 26 is blocked using a sponge, and the filler is introduced into the gap. Therefore, the construction cost is reduced by avoiding the use of the hypothesis for supporting the formwork.

In addition, since the length of the second beam 30 should be formed very long in a place where a span of 20m or more is required, such as a concert hall, it is difficult to be manufactured and transported into a PC by the length of the second beam 30. . Therefore, in order to solve such a problem, the second beam 30 is segmented and transported as shown in FIG. 7, and is assembled and used at the place where the building is constructed. Fig. 7 is a diagram showing that the second beam according to the present invention is divided into three parts 31, 32 and 33. Figs. Shear keys are formed at both ends of the middle beam 32 of the second beam 30, and portions 31 and 32 forming both ends of the second beam 30 can be combined with the middle of the second beam 30. Shear grooves are formed. After assembling the three component parts of the second beam 30, the tension member is applied, and then the tension is applied to complete the second beam 30 to form a very long span. The second beam 30 may be formed by segmenting a larger number along the length of the span.

8 is a diagram illustrating a procedure for constructing a prestressed long span PC frame structure system according to the present invention. Referring to Figure 8,

First, as shown in FIG. 8A, a pillar 10 on which a first beam 20 is attached is mounted at a designated position by using a crane on a building site on which a foundation is laid. Considering the performance of the crane and the weight of the first beam 20, the column 10, the column 10 can be erected first, and then the first beam 20 can be assembled. As shown in FIG. 8B, the plurality of second beams 30 are coupled to the corresponding positions between the plurality of first beams 20 positioned by using cranes, so as to be coupled between the first beams 20. Completion of the second beam 30 to complete the beam of the building. Then, as shown in Figure 8c to raise the slab 100 on the top of the beam to complete a layer. The slab 100 uses what is generally used.

Subsequently, as shown in FIG. 8D, another pillar 10 is placed on the upper portion of the pillar 10 using a crane to form an upper pillar, and the first beam is assembled to the pillar in the same manner as the lower layer. Later, the second beam is combined with the first beam and the slab is raised to complete the manufacture of the upper layer. Continue to assemble the desired number of floors to complete the frame of the building.

According to the prestressed long span PC frame structure system according to the present invention, it is possible to provide a pleasant environment to the residents of the building, such as the building occupants, because the use of reinforced concrete is more resistant to noise and vibration than using steel structures. It becomes cheaper.

In addition, since the first beam and the second beam are used for the length of the span, which is the distance between the pillar and the pillar, the length of the span must be longer than that of the structure using the conventional PC frame structure, so that the length of the span must be long, such as theaters, train stations, discount stores, It can be used in the construction of buildings such as libraries, museums, etc., so that the cost of use can be reduced according to construction costs, making it easily available to many people.

In addition, when the length of the span is longer, the length of the beam is increased, but in the case of a PC, a pre-manufactured beam is carried. Therefore, by dividing the beam into several parts to be assembled in the field after transporting each part to complete the beam can reduce the inconvenience to transport.

While the preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. Should be done.

Claims (15)

There is a reinforced concrete column with a first through hole of a predetermined size and a second through hole of a predetermined size and are coupled to an upper portion of the reinforced concrete column, and the first through hole and the second through hole are in communication with each other. A first tension member penetrating the pillar and the first beam through the first beam, the first through hole, and the second through hole having an “b” shape opposite to the surface; And a second beam having a third through hole of a predetermined size and having a second tension member inserted into the third through hole, the second beam having a "-" shape at both ends thereof, wherein the second beam is between two first beams. Prestressed long span PC frame structure system, characterized in that configured in. The prestressed long span PC frame structure system according to claim 1, wherein a sheer groove having a predetermined size is formed in the reinforced concrete column so that the first beam is attached to the sheer groove. 3. The prestressed long span PC frame structure system according to claim 2, wherein a sheer key is formed in a cross section engaging with the pillar of the first beam corresponding to the sheath groove. 2. The prestressed long span PC framework structure system of claim 1, wherein the first tension member is pulled after being inserted. The prestressed long span PC framework structure system of claim 1, wherein the second tension member has a contractive force. 2. The prestressed long span PC frame structure system as recited in claim 1, wherein said second through hole is in an upper portion of the portion protruding to engage with said second beam of said first beam. 3. The prestressed long span PC frame structure system according to claim 2, wherein the third through hole is in a lower portion of the second beam protruding to engage with the first beam. The prestressed long span PC frame structure system according to claim 1, wherein the first steel plate is formed at a cross section engaging with the second beam. The prestressed long span PC frame structure system according to claim 1, wherein the first beam has a second iron plate attached to a cross section coupled to the reinforced concrete column, and a constant groove is formed on the rear surface of the iron plate. The prestressed long span PC frame structure system according to claim 9, wherein a screw having a predetermined thickness is embedded in the reinforced concrete column and the screw is coupled to the second iron plate. The prestressed long span PC frame structure system according to claim 1, wherein the reinforced concrete column and the upper portion of the first beam are connected by a hinge. 2. The prestressed long span PC framework structure system of claim 1, wherein the second beam is comprised of at least one component. 13. The prestressed long span PC frame structure system according to claim 12, wherein a sheer groove and a sheer key are formed in the connection portion of the second beam. The prestressed long span PC frame structure system according to claim 1, wherein a filler is injected to secure the joint portion of the first beam and the second beam. 2. The prestressed long span PC frame structure system according to claim 1, wherein the first tension member is formed at an upper portion of the first beam and the second tension member is formed at a lower portion of the second beam.