KR101386960B1 - Connection Structure Of Prestressed Precast Concrete Beam Unit In The Low Bending Moment Zone And Construction Method Thereof - Google Patents

Abstract

The present invention is a PC beam unit installed by applying a tensile force to the lower portion of the PC beam unit lower concrete 120 and the PC beam lower concrete 120 is cured by being placed on both ends of the prosthetic bone 110 and the prosthetic bone 110 Prestressed PCB unit 100 including a tension member (T); And, the bracket steel 210 and the bracket concrete 220 is placed and wrapped around the bracket steel frame 210 of the same cross section as the prosthetic bone 110 and the suspension is embedded by applying a tensile force to the PC pillar member and both ends are It is configured to include; the bracket bracket 220 comprising a bracket tension material (T`) buried by applying a tensile force on the bracket concrete 220, the prosthetic bone 110 and the bracket steel 210 Plate or welding is connected, the connection portion of the prosthetic bone 110 and the bracket steel 210 is located in the low moment zone (LM) with a minimum or minimum moment due to the vertical load acting on the beam throughout the building, The PC beam unit tension member (T) and the bracket tension member (T`) are protruded a predetermined length from the side of the PC beam lower concrete 120 and the bracket concrete 220, respectively, but are not connected to each other, the upper and the prosthetic bone 110 The prosthetic bone 110 and Low moment of the steel brackets prestressed beams PC unit showing the process of manufacturing the pouring cast-in-place concrete 300 to the connection region of 210 provides the zone connecting the structure and methods for their construction.

Description

Connection structure of prestressed precast concrete beam unit in the low bending bending zone and construction method thereof}

The present invention is to connect the pre-stressed PC beam unit to the bracket at the moment where the moment is least applied, structural stability even if the tension member of the PC beam unit and the tension member of the bracket is disconnected from the existing continuous tension member installation method The present invention relates to a low moment zone connection structure of a prestressed PC beam unit secured and excellent in workability and economical efficiency, and a construction method thereof.

In recent years, the demand for precast concrete structures is increasing due to the increase in the demand for high-rise buildings.

The conventional PC structure is manufactured by pre-fabricating the PC pillar unit and the PC beam unit in the field. In the conventional PC structure, even though the coupling portions between the PC pillar units are separate, the construction of the coupling portions of the PC pillar units and the PC beam units is performed by the reinforcement of the reinforcement in the small space between the units. According to this, there are many differences in work speed and quality, and the risk of safety accident is high. In addition, when the grouting or concrete pouring to reinforce the coupling portion of the PC column unit and PC beam unit is preceded by the formwork, there is a hassle to cut and form the form in the field due to the complex shape of the coupling portion. It takes a lot of time and attention due to the nature of manual work at high altitude.

In the case of steel frames, structures such as columns and beams can be quickly constructed first with steel frames, and all other types of construction can be performed independently and in parallel by using the structures constructed with steel frames as supports. Therefore, the structural work including the slab construction of steel frame does not become a critical path in the whole process and does not delay the air.

However, in the case of the PC structure, it is impossible to perform the structure construction of the upper layer until the structure construction (column and beam) and the slab construction of the lower layer are completed, and as described above, a lot of time is required in the construction of the coupling portion of the PC pillar unit and the PC beam unit. As a result, it has been pointed out that the construction of the PC structure becomes a critical path in the whole process and delays the air.

1 shows moments acting on beams in a typical building. As shown in FIG. 1, when looking at the moment due to the vertical load acting on the beam (solid red line), the minimum moment (LM) is applied at the point spaced apart from the column, and the high moment is usually applied at the junction between the beam and the column. Zone is formed.

Therefore, such a conventional PC structure makes it difficult to install the connecting portion when installing the PC pillar or PC beam and leads to a risk of safety accident. It has also been pointed out the structural severity that adversely affects the entire PC structure due to unexpected loads during construction.

The problem of the conventional PC structure described above is that since both the pillar member and the beam member are critical paths, they are composed of cutting parts, and are designed as a unit unit according to the beam level or the slab level. Convenience and structural safety are overlooked.

Therefore, as shown in FIG. 1, the connection part of the pillar and the PC beam unit is placed in the low moment zone (LM) where the moment acts less. It is urgent to develop a PC beam unit joint structure that has excellent structural performance against buckling or vertical and horizontal loads by increasing workability and safety by excluding work having high construction difficulty at high altitude by performing only work.

2 illustrates a tension member generally installed in a beam.

As shown in FIG. 2, in the general ramen structure, when the tension member is installed by pretension or post tension, it is installed by a continuous suspension curve based on the moment diagram of FIG. 1. However, in theory, since the tension member does not need to be installed in the low moment zone LM, the tension member may be omitted in the low moment zone LM, but the situation is not even attempted due to the difficulty of construction such as the tensioning work of the tension member.

Therefore, by connecting the PC beam unit in the low moment zone (LM), it is urgent to develop a method for shortening the air and cutting the tension member to improve construction and economics.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the related art. The purpose is as follows.

First, it is to provide a low-moment zone connection structure of the prestressed PCB beam unit and its construction method which is structurally trouble-free and improves the construction and economical efficiency by breaking the tension member in the low moment zone.

Second, it is to provide a low-moment zone connection structure of the prestressed PC beam unit having excellent structural performance for vertical and horizontal loads by placing the connection portion of the PC beam unit in a low moment zone rather than a high moment zone and a construction method thereof.

Third, to provide a low-moment zone connection structure and a construction method of the prestressed PC beam unit is convenient and fast construction at high altitude by manufacturing a PC member with a PC beam unit including the conventional complex work in the ground in advance.

Fourth, it is to provide a low moment zone connection structure of the prestressed PC beam unit that can be easily installed at the installation site, even the unskilled workers can secure a certain quality and construction method thereof.

Fifth, the construction of the prestressed PC beam unit with improved wettability and construction method is improved because it is constructed by a dry method with minimal wet work.

In order to solve the above technical problem, the present invention is mounted on both ends of the prosthetic bone 110 and the prosthetic bone 110 to be cured under the PC beam unit lower concrete 120 and the PC beam lower concrete 120. A prestressed PC beam unit 100 including a PC beam unit tension member T installed by applying a tensile force; And, the bracket steel 210 and the bracket concrete 220 is placed and wrapped around the bracket steel frame 210 of the same cross section as the prosthetic bone 110 and the suspension is embedded by applying a tensile force to the PC pillar member and both ends are It is configured to include; the bracket bracket 220 comprising a bracket tension material (T`) buried by applying a tensile force on the bracket concrete 220, the prosthetic bone 110 and the bracket steel 210 Plate or welding is connected, the connection portion of the prosthetic bone 110 and the bracket steel 210 is located in the low moment zone (LM) with a minimum or minimum moment due to the vertical load acting on the beam throughout the building, The PC beam unit tension member (T) and the bracket tension member (T`) are protruded a predetermined length from the side of the PC beam lower concrete 120 and the bracket concrete 220, respectively, but are not connected to each other, the upper and the prosthetic bone 110 The prosthetic bone 110 and Low moment of the steel brackets prestressed beams PC unit showing the process of manufacturing the pouring cast-in-place concrete 300 to the connection region of 210 provides the zone connecting the structure and methods for their construction.

According to the present invention, the following effects are expected.

First, it provides a low-moment zone connection structure and construction method of the prestressed PCB beam unit that is structurally trouble-free and improves the construction and economical efficiency by breaking the tension member in the low moment zone.

Secondly, by providing the connection part of the PC beam unit in the low moment zone, not the high moment zone, it provides a low moment zone connection structure of the prestressed PC beam unit having excellent structural performance against vertical and horizontal loads and a construction method thereof.

Third, by providing a PC member with a PC beam unit including the complicated work in the air in advance in the ground to provide a low moment zone connection structure of the prestressed PC beam unit is convenient and fast construction at high altitude, and its construction method.

Fourth, it provides a low-moment zone connection structure and construction method of the prestressed PC beam unit that can be easily installed at the installation site to secure a certain quality even inexperienced workers.

Fifth, since it is constructed by a dry method with minimal wet work, it provides a low moment zone connection structure of the prestressed PC beam unit with improved workability and a construction method thereof.

1 shows a moment acting on a beam in a building.
2 illustrates a tension member generally installed in a beam.
Figure 3 shows before the cast-in-place concrete in the low moment zone connection structure of the prestressed PC beam unit of the present invention.
Figure 4 shows after the cast-in-place concrete in Figure 3;
Figure 5 is a perspective view of the prestressed PCB unit in the present invention.
6 is a front view of Fig. 5. Fig.
Figure 7 shows a pillar bracket in the present invention.
8 illustrates a state in which the prestressed PCB unit is installed in the pillar bracket.
9 is another embodiment of FIG. 3.
FIG. 10 shows after the cast-in-place concrete is poured in FIG. 9.
11 is another embodiment of FIG. 5.
12 is a front view of FIG. 11.
13 is another embodiment of FIG. 7.
14 is another embodiment of FIG. 8.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

One. Prestress  PC Of the unit Low moment zone  Connection structure

3 is a view showing before the cast-in-place concrete is cast in the low-moment zone connection structure of the prestressed PC beam unit of the present invention, Figure 4 shows after the cast-in-place concrete in FIG.

The low moment zone connection structure of the prestressed PCB beam unit of the present invention is shown in Figures 3 and 4,

PC beam unit tensile material (T) is installed by applying a tensile force to the lower portion of the PC beam unit lower concrete 120 and the PC beam unit concrete 120 that is placed and cured at the lower end of the prosthetic bone 110 and the prosthetic bone 110 (T) Prestress PCB unit 100 is configured to include; And

Bracket concrete (210) and the bracket concrete 220 is placed and cured around the bracket steel frame 210 of the same cross section as the prosthetic bone 110 and the suspension is embedded by applying a tensile force to the PC pillar member and both ends of the bracket It is configured to include; pillar bracket (220) comprising a bracket tension material (T`) buried by the tensile force is applied to the concrete 220,

The prosthetic bone 110 and the bracket steel frame 210 is connected by a plate or welding,

The connection portion of the prosthetic bone 110 and the bracket steel frame 210 is located in the low moment zone (LM) is a minimum or minimum moment due to the vertical load acting on the beam throughout the building,

The PC beam unit tension member (T) and the bracket tension member (T`) are protruded a predetermined length from the side of the PC beam lower concrete 120 and the bracket concrete 220, respectively, but not connected to each other,

The site-casting concrete 300 is placed on the connection portion between the upper portion of the prosthetic bone 110 and the prosthetic bone 110 and the bracket steel frame 210.

The site-cast concrete 300 is mainly poured with slab concrete.

FIG. 5 is a perspective view illustrating the prestressed PCB unit in the present invention, and FIG. 6 is a front view of FIG. 5. And Figure 7 shows the pillar bracket in the present invention, Figure 8 shows a state in which the prestressed PCB beam unit is installed on the pillar bracket.

The PC beam unit tension members (T, T1) and the bracket tension members (T`, T`1) are horizontally embedded as shown in Figures 5 (a), 6 (a) and 7 (a), respectively. It can be characterized by

As shown in FIGS. 5 (b), 6 (b) and 7 (b), the PC beam unit tension members T and T2 are embedded with a suspension curve in which the center sags downward, and the bracket tension material T`. , T'2) may be characterized in that the end is curved down. 5 (b), 6 (b) and 7 (b) are models close to the most ideal moment diagram of FIG. 1 in consideration of manufacturability and constructability, FIGS. 5 (a) and 6 (a). And the embodiment of Figure 7 (a) may be advantageous, including all types of tension members that can effectively support the moment acting on the structure.

As shown in Figure 7 (b), when the bracket tensioning material (T`, T`2) is characterized in that the end is curved down, the bracket steel 210 is H-shaped steel, T-shaped steel, etc. In the case of drilling the hole in the upper flange and passing through the tension member (T) through the hole can be produced. At this time, the tension member (T) automatically forms an ideal tensile curve of a gentle type around the pillar line.

Conventional brackets are installed to protrude slightly from the outer surface of the pillar, but the pillar bracket 220 is extended and is characterized in that the end is located in the low moment zone (LM). In addition, the prosthetic bone 110 and the bracket steel frame 210 may use all existing steel frames, such as H-shaped steel, T-shaped steel, and inverse T-shaped steel, or reinforced plastics such as FRP (fiber-reinforced plastic) if only a predetermined strength is guaranteed. Material can also be used.

FIG. 9 is another embodiment of FIG. 3, and FIG. 10 is a view illustrating after the cast-in-place concrete is poured in FIG. 9. FIG. 11 is another embodiment of FIG. 5, and FIG. 12 is a front view of FIG. 11. 13 is another embodiment of FIG. 7, and FIG. 14 is another embodiment of FIG. 8.

9 to 14 are all of the embodiments of the present invention described above for the reinforcement of the PC beam unit and the pillar compensation section root 130, beam bottom root 140, bracket upper head 230 and bracket lower head 240 ),

In detail, the embodiments of FIGS. 9 to 14 have the compensation part root 130 and the lower part root 140 being disposed on the upper and lower portions of the prosthetic bone 110 of the present invention described above, and the bracket steel frame 210. The upper and lower brackets upper and lower brackets 230 and the lower brackets 240 are respectively arranged in the upper and lower portions, so that the compensation lower main portion 130, upper upper bracket 230 and lower lower main root 140 and lower lower root 240 are mounted. ) Are each connected to each other by a coupler. In addition, it is possible to use a conventional reinforcing bar joint method such as overlapping reinforcing bar without using the coupler.

The PC beam unit tension members (T, T1, T2) and the bracket tension members (T`, T`1, T`2) may be installed by pretension or posttension.

When the PC beam unit tension members (T, T1, T2) and the bracket tension members (T`, T`1, T`2) are installed with pretension, members such as sheath pipes and anchorages are reduced. When the tension is installed, the sheath pipe (not shown) is buried before placing the PC beam unit lower concrete 120 or the bracket concrete 220 and the PC beam unit lower concrete 120 or the bracket concrete 220 After pouring and curing, the PC beam unit tension member (T, T1, T2) and the bracket tension member (T`, T`1, T`2) are inserted into the sheath tube (not shown) and then settled in the anchorage. Filling the sheath tube.

Applicants and inventors of the present invention are currently applying for inventions related to the present invention (Application Nos. 10-2011-0079051, 10-2011-0125079, 10-2011-0130375, 10-2012-0003415, etc.). Some of the constituent members of the present invention may be the same as the constituent members of the applications, in particular the PC beam unit tension member (T, T1, T2) and the bracket tension member (T`, T in the content of the application No. 10-2011-0130375) Since `1, T`2) can be considered to be included more, description of duplicate contents will be omitted.

The joint of the existing PC frame can cause serious safety problems because only the reinforcing bar is to withstand construction vertical load or horizontal load during construction, but in the present invention, as described above, the steel frame inserted for assembly (Erection Steel) Because of the bracket steel frame 210 represented by), the joint portion of the pillar and the pillar bracket 220, that is, the joint portion of the vertical steel frame and the pillar bracket 220 inside the pillar, can obtain a quality comparable to that of the steel frame. Of course, there is an advantage to implement a hybrid PC frame building having a steel joint after completion.

2. Prestress  PC Of the unit Low moment zone  Construction method of connection structure

The method of constructing the low moment zone connection structure of the prestressed PCB beam unit of the present invention is a method for constructing the low moment zone connection structure of the prestressed PC beam unit described above,

Specifically, the construction method of the low moment zone connection structure of the prestressed PC beam unit of the present invention of Figures 3 to 8,

(1) PC pillar installation step of installing two PC pillar members each comprising the pillar bracket 220; (2) a PC beam unit lifting step of lifting the prestressed PC beam unit 100 between two pillar brackets 220; (3) a steel connection step for connecting the prosthetic bone 110 and the bracket steel frame 210 by plate or welding; And, (4) compensating part concrete placing step of pouring the site-casting concrete 300.

And the construction method of the low moment zone connection structure of the prestressed PC beam unit of the present invention of Figures 9 to 14,

(1) PC pillar installation step of installing two PC pillar members each comprising the pillar bracket 220; (2) a PC beam unit lifting step of lifting the prestressed PC beam unit 100 between two pillar brackets 220; (3) a steel connection step for connecting the prosthetic bone 110 and the bracket steel frame 210 by plate or welding; (4) the main column connecting step of connecting the compensation peripheral root 130 and the upper bracket main bracket 230 and the lower lower root 140 and the lower bracket main bracket 240 with each other by a coupler or reinforcing bar; And, (5) compensating part concrete placing step of placing the site-casting concrete 300.

In conclusion, the present invention is structurally trouble-free and improves workability and economics by disconnecting the tension member in the low moment zone, and by placing the connection of the PC beam unit in the low moment zone, not the high moment zone, The performance is excellent.

In addition, the construction of the PC member by the PC beam unit including the complex work in the conventional high ground in advance is convenient and fast in the air, and can be easily installed at the installation site, so even unskilled workers can secure a predetermined quality safely.

In addition, construction is improved because the construction method is minimized by the wet operation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

It is therefore intended that the appended claims cover such modifications and variations as fall within the true scope of the invention.

LM: low moment zone
T, T1, T2: PC beam unit
T`, T`1, T`2: Bracket Tension
100: prestressed pcbo unit
110: prosthetic bone
120: PC beam unit lower concrete
130: compensation
140: lower back
220: pillar bracket
210: bracket steel
220: bracket concrete
230: upper bracket
240: lower bracket root
300: cast-in-place concrete

Claims (8)

PC beam unit tensile material (T) is installed by applying a tensile force to the lower portion of the PC beam unit lower concrete 120 and the PC beam unit concrete 120 that is placed and cured at the lower end of the prosthetic bone 110 and the prosthetic bone 110 (T) Prestress PCB unit 100 is configured to include; And
Bracket concrete (210) and the bracket concrete 220 is placed and cured around the bracket steel frame 210 of the same cross section as the prosthetic bone 110 and the suspension is embedded by applying a tensile force to the PC pillar member and both ends of the bracket It is configured to include; pillar bracket (220) comprising a bracket tension material (T`) buried by the tensile force is applied to the concrete 220,
The prosthetic bone 110 and the bracket steel frame 210 is connected by a plate or welding,
The connection portion of the prosthetic bone 110 and the bracket steel frame 210 is located in the low moment zone (LM) is a minimum or minimum moment due to the vertical load acting on the beam throughout the building,
The PC beam unit tension member (T) and the bracket tension member (T`) are protruded a predetermined length from the side of the PC beam lower concrete 120 and the bracket concrete 220, respectively, but not connected to each other,
The low moment zone connection structure of the prestressed PC beam unit, characterized in that the cast-in-place concrete 300 is poured on the connection between the upper portion of the prosthetic bone 110 and the prosthetic bone 110 and the bracket steel frame 210.
In claim 1,
The PC beam unit tensioning material (T, T1) and the bracket tensioning material (T`, T`1) is a low moment zone connection structure of the prestressed PCB unit, characterized in that each is embedded horizontally.
In claim 1,
The PC beam unit tension member (T, T2) is buried in a suspension curve that sag down the center, the bracket tension member (T`, T`2) is prestressed PVC beam, characterized in that the end is curved in the form of sag down Low moment zone connection structure of the unit.
3. The method according to claim 1 or 2,
The upper and lower portions of the prosthetic bone 110 are compensated by the peripheral roots 130 and the lower roots 140, respectively, and the upper and lower brackets 210 and upper brackets 230 and the lower brackets respectively ( 240 is the reinforcement, the compensation root 130 and the upper bracket 230 and the lower root 140 and the lower bracket 240 is connected to each other by a coupler or reinforcing bar joint, characterized in that Low moment zone connection structure of prestressed PC beam unit.
4. The method of claim 3,
The upper and lower portions of the prosthetic bone 110 are compensated by the peripheral roots 130 and the lower roots 140, respectively, and the upper and lower brackets 210 and upper brackets 230 and the lower brackets respectively ( 240 is the reinforcement, the compensation root 130 and the upper bracket 230 and the lower root 140 and the lower bracket 240 is a prestressed PC, characterized in that connected to each other by a coupler Low moment zone connection structure of beam unit.
delete delete delete

Images