KR100277608B1 - Three-dimensional truss floor structure and its construction method - Google Patents

Abstract

An object of the present invention is to provide a three-dimensional truss bottom structure and its construction method that can reduce the thickness of the structural member by arranging the truss in both long and short sides, and can effectively use the cross-section of the member by introducing a prestress to the tension member. .

The three-dimensional truss bottom structure of the present invention is composed of a truss upper chord (2), a truss lower chord (3), posts (20, 30) and the tension member (7). The truss top chord 2 is installed in a grid between four columns, and posts 20 and 30 are vertically installed below the intersection of the grids. The truss lower chord 3 is provided between the lower ends of the posts. The lower ends of the posts 20 and 30 are formed with through holes penetrating the posts and fixing holes 25 and 35. The fixed end 10 is installed at the portion where the truss top chord 2 and the column 1 meet, and the fixing end 10 is formed with hooks 12, 15, and 16 to wind the tension member 7 in one round. Can be fixed. If the tension member 7 is installed between the fixing clamps 12, 15 and 16 of the fixed end and the fixing holes 25 and 35 at the bottom of the post and is fixed by tension, the ends of the posts 20 and 30 try to rotate toward the column. Since the lower part of the post is restrained by the truss lower chord 3, the resultant is subjected to upward synthetic force, and the effect of introducing a kind of prestress can be obtained. When the tension and fixation of the tension member (7) is completed, the formwork such as deck plate (8) is installed on the upper chord (2), the reinforcing bars or wire mesh is placed and then the concrete is poured.

Description

Solid truss floor structure and its construction method (Trussed floor structure)

The present invention relates to a three-dimensional truss floor structure and its construction method. More specifically, a truss upper chord is installed between the pillar and the pillar, a post is installed at the lower part of the grid-shaped intersection of the upper chord, a truss lower chord connecting the lower part of the post is installed and fixed at the corner of the pillar. The present invention relates to a structure and a method of constructing the lower end of the post and the post, by tensioning and then fixing the post to apply the upward force to the top of the post to reduce the load on the top of the post.

The truss structure used for the floor structure of the structure is usually a planar one-way truss. Therefore, it is common to arrange the main truss in one direction between the pillar and the auxiliary beam or the auxiliary truss in the perpendicular direction. Even if the lengths of the long and short sides are the same, if the truss is installed in both directions, the top and bottom chords should be arranged in a lattice, because the details of the joint are complicated and the efficiency is reduced. This is the same context in which there is not much use of grid beams in reinforced concrete beams.

Accordingly, the present invention has been developed to solve the inconveniences described above to develop a two-way truss system excellent in workability and can significantly reduce the construction cost and air.

It is an object of the present invention to provide a bidirectional truss structure having a simple construction and having good workability, and a construction method thereof.

Another object of the present invention is to provide a structure having high structural efficiency and a method of constructing the same by using a bidirectional truss structure and introducing a prestress into the tension member to reduce the thickness of the structural member.

Still another object of the present invention is to provide a structure and a method of constructing the same, which is advantageous in reducing the height of the floor, by making a truss using a tension member, thereby making full use of the space in the ceiling as a space for facility piping.

1 is a plan view of the truss image present.

2 is a plan view of the truss lower chord.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a plan view of the deck plate is installed.

5 is a top plan view of the portion "A" of FIG.

FIG. 6 is an elevational view of portion "A" in FIG.

7 is a modification of the fixed end of FIG.

8 is an elevation view of a fixed end attached to the bottom of the girder.

FIG. 9 is a plan detail view of portion “B” in FIG. 2.

FIG. 10 is an elevational view of portion “B” in FIG. 2.

FIG. 11 is a top plan view of the portion “C” of FIG. 2.

FIG. 12 is an elevational view of portion “C” in FIG. 2.

<Description of Symbols for Main Parts of Drawings>

1: pillar 2: truss phase present

3a, 3b, 3c: truss lower chord 4: girder

5: beam 6: auxiliary beam

7: tension member 8: deck plate

10: fixed end 11, 14: horizontal iron plate

12, 15, 16: Latch 13: Reinforcing plate

20, 30: post 21, 31: vertical member

22, 32: upper iron plate 23, 33: lower iron plate

24, 34: fixing plate 25, 35: fixing unit

This invention is demonstrated by the specific example shown in drawing.

The three-dimensional truss floor structure of the present invention is a system that can be constructed in a truss structure using the truss upper chord (2), the truss lower chord (3), the posts (20, 30) and the tension member (7), FIG. 1 is a plan view of the truss upper chord 2, FIG. 2 is a plan view of the truss lower chord 3, and FIG. 3 is a sectional view thereof.

The truss phase presenter 2 consists of a girder 4 and a beam 5 or an auxiliary beam 6. A girder 4 is installed between the pillar and the pillar, and a beam 5 is installed between the girder 4 and the girder 4 in the long side direction. As shown in FIG. 1 and FIG. 2, the pillar member may be a square or circular steel pipe as well as an H-beam. In FIG. 1, a sub-beam between the girder 4 and the beam 5 may be used. , 6) is installed, but in some cases, the auxiliary beam 6 may be omitted. As the truss top chord 2, an H-beam, an I-beam, a T-beam, or a steel pipe can be used. The girders 4 and the beams 5 use members having the same dimensions, but the auxiliary beams 6 do not have a large load, so a small member can be used. As shown in the figure, it is most preferable to divide the girders 4 or the beams 5 into three, but this may be divided into two or more portions, depending on the result of the structural calculation. The connection between the truss phase chord 2 and the column 1 is usually installed by a method used in steel construction, which is obvious to those skilled in the art.

As shown in FIGS. 1 to 3, a plurality of posts 20 and 30 are vertically installed on the lower surface of the beam 5 or the girder 4, and the posts are the intersections of the girder and the beam or the auxiliary beam. It is preferable to install in. A lattice truss lower chord 3 is provided between the lower ends of the posts. As the truss lower chord 3, an H-beam, an I-beam, a T-beam, a steel pipe or a steel sheet can be used. The truss lower chord 3 is engaged with the lower plate of the post by means such as rivets, bolts, high tension bolts or welding. Girder other than the lower chord 3b connecting the lower chord 3a connecting between the post 20 installed in the lower beam of the center of the truss lower chord and the post 30 installed below the girder 4 4) Since the lower chord 3c connecting the post 30 installed below and the post 20 installed below the beam 5 has a small load, a small member can be used.

In FIGS. 1 and 2, the posts are respectively installed at the lower part of the beam and the lower part of the girder, and the lower part of each post is connected to the truss under the lattice, but the post 30 is installed at the lower part of the girder. The structure may be constructed by omitting the post 20 of the lower beam corresponding to the center portion of the slab and the truss lower chord 3a connecting the lower beam of the slab.

5 to 8 are detailed views of the fixed end 10. A fixed end is provided at a portion where the truss top chord 2 and the column 1 meet or the lower surface of the truss top chord 2. The fixed end 10 is fixed to the fixing holes 25 and 35 at the lower end of the post by hooking the tension member 7 and is installed in the diagonal direction and the main column direction of the pillar.

5 and 6 are detailed plan and elevation views of the fixed end 10 in the diagonal direction. The fixed end in the diagonal direction is for installing the tension member 7 between the posts 20 installed in the lower part of the beam, and the horizontal iron plate between the posts on the same plane as the upper flange surface of the upper chord 2. 11) is installed by welding horizontally, and the hook 12 is attached to the lower side of the horizontal iron plate (11). Hanger 12 is installed to be inclined to cut the round steel pipe to be inclined toward the pillar. Since the hook 12 is inclined toward the pillar, the tension member 7 is wound around the hook 12 so that both ends of the tension member are inserted into the through-hole of the lower end of the post, and the tension member 25 is released. It doesn't work. When the tension member 7 is tensioned using a hydraulic jack and then fixed to the anchorage 25, the end of the post is rotated toward the column by the tension of the tension member 7, but the lower part of the post is restrained by the truss lower chord. As a result, upward synthetic force is generated. The reinforcing steel plate 13 is vertically welded between the column and the pillar in the same direction as the direction of the tension member so as to resist the tensile force applied to the horizontal steel plate 11 by the tension member 7. do.

7 is a variation of the fixed end (figures 5 and 6), and forms a hole, such as the horizontal cross-sectional shape of the column so that the pillar can be fitted to the horizontal iron plate 14 of the octagonal shape Iron plate (14) is fitted to the pillar and installed by welding to the pillar (1), respectively. When the cross-section of the column is H-shaped, complex drilling operations may be burdensome, so as shown in FIGS. 1 and 2, rectangular or circular column cross sections may be used, and empty space may be filled with concrete. Next, the above-described clasp 15 is welded to the lower surface of the horizontal iron plate 14 in a diagonal direction.

8 is an elevational view in which the fixed end in the main row direction is installed, wherein the fixed end in the main row direction is for installing a tension member between the posts provided in the lower part of the girder, and the truss 16 is directly connected to the truss without any other member. On the lower surface of the upper chord (2) is installed by welding so that the lower end of the clasp 16 is inclined toward the pillar. The hook 16 is installed to be inclined to cut the round steel pipe as described above so that the steel pipe is inclined toward the pillar, and the tension member is wound around the hook and rotated to insert the both ends of the tension member into the through hole of the lower end of the post. And it can be settled in the fixing opening 35.

9 and 10 are detailed views of the posts 20 installed at the intersections of the sub-secondary beams 6 of the beams 5. The post 20 is composed of the vertical member 21, the upper iron plate 22, the lower iron plate 23, the fixing iron plate 24 and the fixing unit 25. The vertical member 21 uses a circular or rectangular steel pipe or steel bar, and attaches the upper steel plate 22 having a shape such as a circular, square or octagon to the top of the vertical member 21 horizontally. The upper steel plate 22 is coupled with the truss top string 2 by means such as rivets, bolts, high tension bolts or welding. The lower iron plate 23 is attached to the middle of the vertical member 21. The lower iron plate 23 is formed with a hole having the same diameter as the outer diameter of the vertical member 21 so that the vertical member 21 can be inserted, the lower iron plate 23 is inserted into the vertical member 21 and welded Fix it. The lower steel plate 23 is coupled to the truss lower chord 3 by means such as rivets, bolts, high tension bolts or welding. A fixing iron plate 24 is inclined between the lower iron plate 23, the beam 5, and the auxiliary beam 6, and the fixing iron plate 24 has a hole for inserting the tension member 7 therein. And the fixing unit 25 is installed on the outer surface. The lower side of the vertical member 21 communicates with a hole formed in the fixing iron plate 24, and a through hole in the vertical direction is formed in the fixing iron plate 24. Therefore, the tension member 7 may be inserted into the through hole formed in the vertical member 21 and the hole formed in the fixing iron plate 24 to fix the fixing member 25.

11 and 12 are detailed views of the post 30 installed at the intersection of the bottom beam 5 or the auxiliary beam 6 of the girder 4. The post 30 installed in the lower part of the girder 4 also has the vertical member 31, the upper iron plate 32, the lower iron plate 33, the fixing iron plate 34, and the fixing unit, like the post 20 installed in the lower beam. Although the configuration is the same as (35), there is a slight difference in the shape of the fixing plate 34 and the installation direction of the tension member (7). The upper steel plate 32 is attached to the upper end of the vertical member 31 to bind with the truss upper chord 2, and the lower steel plate 33 is installed at the middle of the vertical member 31 to bind with the truss lower chord 3. do. The lower end portion of the vertical member 31 is inclinedly cut, and the fixing iron plate 34 is attached to the inclined cut portion. The vertical member 31 and the fixing iron plate 34 are formed with holes penetrating in the vertical direction to the fixing iron plate 34, and the fixing iron plate 34 is formed with the fixing holes 35. Accordingly, the tension member 7 may be inserted into the fixing hole to fix the fixing member 35.

One end of the tension member 7 is inserted into the lower end through hole of the posts 20 and 30, and the other end is turned to the lower end through hole of the posts 20 and 30 by turning the latch of the fixed end 10 once. It is inserted and fixed to the fixing holes 25 and 35. As the tension member 7, it is common to use a PC steel wire, but a member such as a steel bar may be used. Fixing of the tension member 7 uses a fixing device for fixing a PC steel wire or a rock anchor of prestressed concrete. Tension of the tension member (7) is to use a hydraulic jack in the main row direction and the diagonal tension member to be paired with each other, it is preferable to simultaneously tension with four hydraulic jacks in the diagonal direction.

When the tension member 7 is installed between the fasteners 12 and 16 of the fixed end 10 and the fixing holes 25 and 35 at the lower ends of the posts 20 and 30, the tension member 7 is tensioned and fixed. The lower end of the post tries to rotate toward the column, but the lower part of the post is constrained by the truss lower chord 3, resulting in an upward composite force. This is the same as introducing a kind of prestress, and the lifting current in the upper chord (2) occurs in the upward direction, and the fixed load and the loading load are applied later to compensate for the sagging or crack occurring in the current chord in advance. Structurally much more advantageous.

4 is a plan view of the deck plate (8) installed on the truss upper pole (2), when the tension member and tension of the tension member is completed, the formwork such as deck plate (8) is installed on the truss upper pole (2) Reinforce the wire or wire mesh, then pour concrete to complete the structure.

1 and 2 show the case where there are two beams 5 connecting the transverse girders 4 and the other transverse girders 4 opposite thereto, but the number of beams is characteristic of the structure. Size, load size, etc.). Relatively light structures may have only one beam or no beam at all. In the case where only one beam is arranged, two fixing iron plates for fixing the tension member should be provided in the lower steel plate. In addition, the structure without the beam 5 at all is possible.

By using the three-dimensional truss floor structure of the present invention and the construction method thereof, it is possible to build a floor structure using a bidirectional truss to increase the structural efficiency. In addition, by introducing prestress into the tension member, deflections and cracks occurring in the structure can be compensated in advance, so that the dimension of the structural member can be reduced, which is very economical.

Conventionally, a space for facility piping to be installed into the ceiling has to be secured separately under the slab structural member. However, in the present invention, the facility piping is sufficient through the space formed between the tension member and the upper and lower chords, thereby lowering the height of the floor. have.

In addition, the appearance of the ceiling after the construction is beautiful, there is an advantage that the ceiling may not be installed in some cases.

Claims (9)

A truss phase presenter (2) consisting of a plurality of girders (4) connecting between the pillar (1) and the pillar (1) and a plurality of beams (5) connecting between the girders (4) and the girders (4); A fixed end 10 installed at a portion where the pillar 1 and the girder 4 cross each other; A plurality of posts 20 installed vertically below the center of the beam 5; A truss lower chord 3a connecting lower ends of the plurality of posts 20; A plurality of tension members (7) connecting the lower ends of the posts (20) diagonally adjacent from the fixed end (10); Fixing means for tensioning and fixing the tension member (7); And, A slab structure installed above the truss top chord (2); Three-dimensional truss bottom structure, characterized in that consisting of. According to claim 1, A plurality of posts (30) are installed on the lower surface of the girder (4) where the girder (4) and the beam (5) intersect; A truss lower chord 3b connecting the lower end of the post 30; Hanger 16 is installed on the lower side of the pillar side of the girder (4); A tension member (7) connecting the lower end of the hook (16) and the post (30); And, Fixing means for tensioning and fixing the tension member (7); Three-dimensional truss flooring structure further comprising. 3. The three-dimensional truss floor structure according to claim 1, wherein the truss upper chord (2) or the truss lower chord (3) is one of an H-beam, a T-beam, an I-beam, a steel pipe, or a steel sheet. 3. The three-dimensional truss flooring structure according to claim 1, wherein the beams (5) connect the three quadrants of the girders (4), respectively. The method of claim 1, wherein the fixed end 10 A horizontal iron plate (11) attached horizontally between the girder (4) and the column (1); It is installed in the lower portion of the horizontal iron plate (11), the lower side is installed to be inclined toward the pillar can be fixed by hanging the tension member (7) (12); And, A reinforcing iron plate 13 installed at an upper portion of the horizontal iron plate 11 to connect the pillar 1 and the horizontal iron plate 11; Three-dimensional truss bottom structure, characterized in that consisting of. The method of claim 1, wherein the fixed end 10 A horizontal iron plate 14 having a hole formed in a shape such as a horizontal cross section of the pillar to be inserted into the pillar 1, and fixed to the pillar 1 and the girder 4 after being inserted into the pillar; And, A catcher 15 installed in a diagonal direction at a lower portion of the horizontal iron plate 14 and installed downwardly at an inclined side toward a pillar to fix the tension member 7 by walking; Three-dimensional truss bottom structure, characterized in that consisting of. The method of claim 1, wherein the post 20 Vertical member 21; An upper steel plate 22 horizontally attached to an upper portion of the vertical member 21 and bound to the truss upper chord 2; A lower iron plate 23 horizontally attached to the middle of the vertical member 21 and engaged with the truss lower chord 3; A fixing iron plate 24 installed at a lower side of the vertical member 21 and having a hole into which the tension member 7 can be inserted; And, A fixing unit 25 attached to the fixing iron plate 24; Consists of, the bottom side of the vertical member 21, the three-dimensional truss flooring structure, characterized in that the through hole connected to the fixing member 25 is formed to be inclined so as to insert the tension member (7). The three-dimensional truss flooring structure according to claim 1, wherein the plurality of beams (5) is zero, one, two, three or four. A truss top chord (2) consisting of a plurality of girders (4) connecting between the pillar (1) and the pillar (1) and a plurality of beams (5) connecting between the girders (4) and the girders (4) Install; A fixed end (10) is installed at a portion where the pillar (1) and the girder (4) intersect; A plurality of posts (20) are installed vertically below the center of the beam (5); Installing a truss lower chord 3a connecting lower ends of the plurality of posts 20; Connecting the lower ends of the posts 20 diagonally adjacent to the fixed ends 10 with a plurality of tension members; Tensioning the tension member (7) to fix it with a camber; And, Constructing a slab structure above the truss top chord (2); Method for constructing a three-dimensional truss flooring structure, characterized in that consisting of steps.