Continuous end-structured truss decks

Abstract

The present invention relates to a continuous end-structured truss decks, the upper steel wires of the ends of the truss decks placed on top of a beam being connected by connection members to form continuous support points in the truss decks to reduce bending moment and deflection due to live as well as construction loads during slab use, allowing long spans to be constructed without camber or temporary supports.

Description

Single-piece continuous truss deck structure

[0001] The present invention relates to a continuous end truss deck structure that connects upper steel wires of both ends of the truss deck mounted on the upper part of a beam with connecting members, thereby configuring the points of the truss deck in a continuous manner, thereby reducing bending moment and deflection not only for the load during use of the slab but also for the construction load, thereby enabling a long span to be implemented without camber or temporary support.

[0002] In general, a truss deck is made of galvanized steel plate and includes a truss girder composed of upper and lower steel wires and lattice material on top of the deck plate. It is widely used in slab formwork because it has high rigidity, minimizes the erection cost, and shortens the construction period.

[0003] Truss decks installed at each span are typically installed by placing deck plates on the top surface of the beam. Therefore, during the construction phase before the concrete poured on top has cured, the design assumes a simple beam for the construction loads (concrete weight and working load).

[0004] The design of such truss decks is dominated by the deflection due to construction loads. If the truss deck is designed as a simple beam during construction, the central deflection is 5ωℓ. 2 / 384EI is five times longer than when fixed at both ends. Accordingly, the span length is limited, and to construct a long span, separate measures such as introducing camber to the deck plate or installing temporary supports are required.

[0005] The truss decks on both sides of the beam are designed to be continuous for the load during use by placing joint reinforcement on site to form a continuous structure with the upper steel wire of the adjacent truss deck.

[0006] However, since the joint reinforcement must secure a tensile anchorage length with the upper steel wire, it requires a large amount of reinforcement. Furthermore, since the joint reinforcement is temporarily fixed to the upper steel wire by tie wires, etc., it cannot exert its joint effect until the concrete has cured, and thus cannot contribute to reducing truss deck deflection under construction loads.

[0007] Meanwhile, the ends of the truss deck must maintain sufficient rigidity to serve as supports.

[0008] However, the lattice material (223) located at the end of the truss girder is cut in the middle and cannot directly support the upper steel wire (222). Therefore, in order to reinforce it and prevent the deck plate (21) from being blown away by strong winds or gusts, +-shaped straight bars (224, 225) are arranged and welded to the lower steel wire (221) and upper steel wire (222) so that they are supported on the upper surface of the beam (1) (Fig. 1). In this case, welding is usually required at a total of five locations, including four factory welds (W1) and one field weld (W2).

[0009] In addition, additional welding work is required on-site as well as in factory production, such as welding a separate shear connector on the top surface of the beam for composite design of concrete and beam at the end of the truss girder.

[0010] In order to solve the above problems, the present invention provides a continuous truss deck structure with a continuous end, which reduces bending moment and deflection for the load during use of the slab as well as the construction load during construction, thereby enabling construction with a long span without camber or temporary support.

[0011] The present invention aims to provide an end-continuous truss deck structure that does not require a separate connecting bar for the upper steel wire by making the truss girder continuous at the truss deck point portion of the upper part of the beam.

[0012] The present invention aims to provide an end-continuous truss deck structure that can solve the problem of low constructability due to the need for a lot of on-site welding processes such as installation of straight bars or shear connectors at the ends of conventional truss girders.

[0013] The present invention according to a preferred embodiment provides an end-continuous truss deck structure characterized by comprising: a pair of truss decks mounted on the upper surface of the beam so that the ends are spaced apart from each other; and a connecting member connecting the upper wires of the facing truss decks to each other; a truss girder comprising a deck plate and a lower wire, an upper wire provided on the upper side of the lower wire, and a lattice member connecting the lower wire and the upper wire.

[0014] According to another preferred embodiment, the present invention provides an end-continuous truss deck structure characterized in that the connecting member is composed of a pair of connecting clips each connected to the upper wire ends of both truss decks, and a connecting wire each of which is connected to the pair of connecting clips at both ends.

[0015] According to another preferred embodiment, the present invention provides a single-ended continuous truss deck structure characterized in that the connecting clip is formed in a U shape, and the upper steel wire and the connecting steel wire are received and fixed inside the connecting clip.

[0016] According to another preferred embodiment, the present invention provides an end-continuous truss deck structure characterized in that a fixing nut that is supported by being hooked on the inner end of the connecting clip is fastened to the end of the connecting wire.

[0017] According to another preferred embodiment, the present invention provides an end-continuous truss deck structure characterized in that a U-shaped support plate is provided on the inner end of the connecting clip to which the fixing nut is hung and supported.

[0018] According to another preferred embodiment, the present invention provides an end-continuous truss deck structure characterized in that the end of the truss girder is provided with a support member to which an upper steel wire is joined at the upper end and which is supported on the upper part of a beam at the lower end, and the front end of the truss deck is provided with a guide plate to which the lower part of a plurality of support members is fixed to the back surface and which is fixed on the upper part of a beam at the lower end.

[0019] The present invention can provide an end-continuous truss deck structure that can form a continuous point of a truss deck on the upper part of a beam by connecting upper steel wires of the left and right ends of the truss deck mounted on the upper part of the beam with a connecting member.

[0020] Accordingly, firstly, the bending moment and deflection are greatly reduced for the load during slab use as well as the construction load before concrete curing, so that it can be constructed as a long span without camber or temporary support.

[0021] Second, since the connecting member directly connects the upper steel wires of both truss decks, no separate splice reinforcing bar or anchorage length for splicing reinforcing bar is required for the upper steel wires, thereby minimizing the amount of reinforcing bar.

[0022] Third, when support members and guide plates are provided at the ends of the truss girder, the on-site welding process for installing existing straight bars or shear connectors can be omitted, resulting in excellent constructability.

[0023] Fig. 1 is a cross-sectional view showing the end details of a conventional truss deck.

[0024] Fig. 2 is a perspective view showing a single-section continuous truss deck structure of the present invention.

[0025] Figure 3 is a perspective view showing a truss girder.

[0026] Figure 4 is a perspective view showing a truss deck in which the deck plate is made of galvanized steel.

[0027] Fig. 5 is a cross-sectional view showing the state in which the truss deck of Fig. 4 is installed.

[0028] Figure 6 is a perspective view showing a truss deck in which the deck plate is a UHPC panel.

[0029] Fig. 7 is a cross-sectional view showing the state in which the truss deck of Fig. 6 is installed.

[0030] Figure 8 is a perspective view showing a connecting clip.

[0031] Fig. 9 is a perspective view showing the coupling relationship of connecting members according to one embodiment.

[0032] Fig. 10 is a perspective view showing the joining state of the connecting member shown in Fig. 9.

[0033] Fig. 11 is a perspective view showing the coupling relationship of connecting members according to another embodiment.

[0034] Fig. 12 is a perspective view showing the joining state of the connecting member shown in Fig. 11.

[0035] Fig. 13 is a perspective view showing a truss deck equipped with a support member and a guide plate.

[0036] Fig. 14 is a perspective view showing a truss girder equipped with plate-shaped support members.

[0037] Fig. 15 is a perspective view showing the installation state of a truss deck equipped with the truss girder of Fig. 14.

[0038] In order to achieve the above object, the present invention provides a single-ended continuous truss deck structure, characterized by comprising: a pair of truss decks mounted on the upper surface of the beam so that the ends are spaced apart from each other; and a connecting member for interconnecting the upper wires of the facing truss decks, each of which comprises a truss girder comprising a deck plate and a lower wire, an upper wire provided on the upper side of the lower wire, and a lattice member connecting the lower wire and the upper wire.

[0039] Hereinafter, the present invention will be described in detail with reference to the attached drawings and preferred embodiments.

[0040]

[0041] Fig. 2 is a perspective view illustrating a single-ended continuous truss deck structure of the present invention, and Fig. 3 is a perspective view illustrating a truss girder. Fig. 4 is a perspective view illustrating a truss deck whose deck plate is a galvanized steel plate, Fig. 5 is a cross-sectional view illustrating a state in which the truss deck of Fig. 4 is installed, Fig. 6 is a perspective view illustrating a truss deck whose deck plate is a UHPC panel, and Fig. 7 is a cross-sectional view illustrating a state in which the truss deck of Fig. 6 is installed.

[0042] As illustrated in FIGS. 2 to 7, the end-continuous truss deck structure of the present invention is characterized by comprising: a beam (1); a truss girder (22) each composed of a deck plate (21) and a lower steel wire (221), an upper steel wire (222) provided on the upper side of the lower steel wire (221), and a lattice material (223) connecting the lower steel wire (221) and the upper steel wire (222), a pair of truss decks (2a, 2b) mounted on the upper surface of the beam (1) so that the ends are spaced apart from each other; and a connecting member (3) connecting the upper steel wires (222) of the facing truss decks (2a, 2b) to each other.

[0043] The present invention provides a continuous truss deck structure with an end portion that can be configured as a long span without camber or temporary support by significantly reducing bending moment and deflection not only for the load during use of the slab but also for the construction load by configuring the points of the truss deck (2a, 2b) in a continuous manner.

[0044] In addition, the present invention provides an end-continuous truss deck structure that does not require a separate overlapping joint reinforcing bar for the upper steel wire (222) by configuring the truss girder (22) to be continuous at the point of the truss deck (2a, 2b) on the upper part of the beam (1).

[0045] In addition, the present invention is to provide an end-continuous truss deck structure that can solve the problem of low constructability due to the need for a lot of on-site welding processes such as installation of straight bars or shear connectors at the ends of conventional truss girders.

[0046] The present invention forms an end-continuous truss deck structure by connecting the ends of both truss decks (2a, 2b) mounted on the upper part of a beam (1).

[0047] The above-mentioned beam (1) is installed in multiple pieces at regular intervals.

[0048] The above beam (1) may be a composite concrete beam or steel beam in which concrete (C) is poured on site inside a U-shaped steel plate with an open upper portion.

[0049] The above truss deck (2a, 2b) is arranged in a direction perpendicular to the longitudinal direction of the beam (1) and both ends are placed on the upper surface of the adjacent beam (1).

[0050] Accordingly, a pair of truss decks (2a, 2b) on the left and right sides are respectively installed on the upper surface of one beam (1). The pair of truss decks (2a, 2b) are arranged so that their ends are spaced apart from each other.

[0051] The above truss deck (2a, 2b) is composed of a deck plate (21) and a truss girder (22).

[0052] On the upper part of the above deck plate (21), a plurality of truss girders (22) can be arranged in parallel in multiple rows so as to be spaced apart in the transverse direction.

[0053] By installing lightweight blocks such as EPS in the space between neighboring truss girders (22) to reduce the weight of the slab, a hollow space inside the slab that is not filled with concrete can be formed.

[0054] The above deck plate (21) can be formed of galvanized steel plate (Fig. 4, Fig. 5) or UHPC panel (Fig. 6, Fig. 7).

[0055] The above truss girder (22) may be composed of a lower steel wire (221) and an upper steel wire (222) spaced vertically apart and a lattice material (223) connecting the upper and lower steel wires (221, 222).

[0056] As shown in FIG. 3, the lower wires (221) are provided in pairs spaced apart from each other, and one upper wire (222) is provided on top of the pair of lower wires (221), so that when viewed from one side, the upper wires can be arranged to form an overall triangular cross-section.

[0057] The above lattice material (223) connects the lower wire (221) and the upper wire (222).

[0058] The above lattice material (223) is bent into a wave shape and joined to the sides of the lower wire (221) and the upper wire (222), thereby fixing the positions of the upper and lower wires (221, 222).

[0059] The lower part of the above lattice material (223) can be bent outward and joined to the deck plate (21).

[0060] When the above deck plate (21) is a galvanized steel plate, the lower part of the lattice material (223) can be fixed to the upper surface of the deck plate (21) by welding or the like.

[0061] If the above deck plate (21) is a UHPC panel, the lower folded portion of the lattice material (223) can be embedded and fixed inside the deck plate (21).

[0062] The above connecting member (3) interconnects the upper steel wires (222) of the facing truss decks (2a, 2b).

[0063] The above connecting member (3) is provided to connect the two truss decks (2a, 2b) mounted on the upper part of one beam (1) to form a continuous end.

[0064] To this end, the above connecting member (3) interconnects the upper steel wires (222) of the two truss decks (2a, 2b) mounted on the upper part of the beam (1).

[0065] Specifically, after installing the two truss decks (2a, 2b) on both sides on the upper part of the beam (1) with their ends spaced apart from each other, the ends of the left and right upper steel wires (222) facing each other can be connected to the ends of the connecting member (3).

[0066] The above connecting member (3) connects the neighboring upper steel wires (222) and transmits the tensile force applied to the upper steel wire (222) by the parent moment at the upper part of the beam (1).

[0067] In this way, the present invention connects the upper steel wires (222) of the left and right truss decks (2a, 2b) to each other, thereby forming a continuous point at the top of the beam (1) at the point of the truss deck (2a, 2b), thereby forming a continuous end not only for the load but also for the construction load before concrete curing, thereby significantly reducing the bending moment and deflection. Accordingly, it is possible to provide an end-continuous truss deck structure that can minimize deflection without installing temporary supports.

[0068] The above connecting member (3) directly connects the upper steel wires (222) on both sides, so there is no need to secure an anchorage length for overlapping joints, thereby minimizing the amount of reinforcing steel.

[0069]

[0070] Fig. 8 is a perspective view illustrating a connecting clip, Fig. 9 is a perspective view illustrating a coupling relationship of a connecting member according to an embodiment, and Fig. 10 is a perspective view illustrating a coupling state of the connecting member illustrated in Fig. 9.

[0071] As shown in FIGS. 8 to 10, the connecting member (3) may be composed of a pair of connecting clips (31) each of which is connected to the ends of the upper wires (222) of the truss decks on both sides (2a, 2b) and a connecting wire (32) whose ends are each connected to the pair of connecting clips (31).

[0072] The above connecting member (3) may be composed of a pair of connecting clips (31) and a connecting wire (32).

[0073] The above connecting clip (31) can be pre-attached to the end of the upper wire (222) and can be fixed to the upper wire (222) by welding or the like.

[0074] As shown in FIGS. 4 and 6, a truss deck (2a, 2b) in which a connecting clip (31) is integrally fixedly connected to the upper steel wire (222) is placed on the upper part of the beam (1), and then, as shown in FIGS. 5 and 7, both ends of the connecting steel wire (32) are connected to the connecting clips (31) on both sides, thereby connecting the upper steel wires (222) on both sides to the connecting steel wire (32).

[0075]

[0076] As shown in FIG. 9 and FIG. 10, the connecting clip (31) is formed in a U shape, so that the upper wire (222) and the connecting wire (32) can be accommodated and fixed inside the connecting clip (31).

[0077] In order to connect the end of the connecting wire (32) that is assembled on site while being fixedly connected in advance to the end of the upper wire (222), the connecting clip (31) may be formed in a U shape with an open upper portion.

[0078] The above connecting clip (31) can be formed by bending a plate such as a steel plate into a U shape.

[0079] At this time, the upper steel wire (222) can be fixed by welding or the like while inserted into the inside of the connecting clip (31). That is, the connecting clip (31) can be connected to the upper steel wire (222) so as to surround the lower outer surface of the upper steel wire (222).

[0080] The above-mentioned connecting wire (32) can be inserted into the open upper part of the connecting clip (31) and accommodated inside the connecting clip (31).

[0081] In order to transmit the tensile force of the upper wire (222) by connecting the above-mentioned connecting wire (32) to the connecting clip (31), the end of the connecting wire (32) protrudes a certain length toward the inner end of the connecting clip (31) (i.e., the opposite side of the beam (1)), and a head portion (321) that is supported by being hooked to the end of the connecting clip (31) can be formed in an enlarged manner on the protruding end of the connecting wire (32).

[0082]

[0083] Fig. 11 is a perspective view showing the coupling relationship of a connecting member according to another embodiment, and Fig. 12 is a perspective view showing the coupling state of the connecting member shown in Fig. 11.

[0084] As shown in FIG. 11 and FIG. 12, a fixing nut (33) that is supported by being hooked to the inner end of the connecting clip (31) can be fastened to the end of the connecting wire (32).

[0085] The spacing between the two truss decks (2a, 2b) installed on the upper part of the above-mentioned beam (1) may not be maintained constant depending on on-site construction errors.

[0086] Accordingly, even if the spacing between the truss decks (2a, 2b) on both sides on the upper part of the beam (1) changes due to construction errors, etc., a fixing nut (33) can be screwed onto the end of the connecting wire (32) so that the connecting wire (32) can be firmly connected to the connecting clip (31) by absorbing such construction errors.

[0087] The fixing nut (33) can be rotated according to the spacing of the connecting clip (31) fixedly connected to the upper wires (222) on both sides, so that the fixing nut (33) can be pressed against the inner end of the connecting clip (31).

[0088] Although not shown in the drawing, the fixed nut (33) may be fastened only to one end of the above-mentioned connecting wire (32), and a fixed head portion (321) may be formed in an enlarged manner at the other end.

[0089]

[0090] As shown in FIG. 11 and FIG. 12, a U-shaped support plate (311) may be provided on the inner end of the connecting clip (31) to which the fixing nut (33) is attached and supported.

[0091] When a plate is bent into a U shape to produce a connecting clip (31), when a tensile force is applied at the joint between the upper steel wire (222) and the connecting steel wire (32), the contact area between the fixing nut (33) and the connecting clip (31) is narrow, so deformation may occur in the connecting clip (31).

[0092] Accordingly, a U-shaped support plate (311) may be provided on the inner end of the connecting clip (31) to increase the pressure area with the fixed nut (33) and to stably transmit stress.

[0093] The above support plate (311) can be formed by cutting a steel plate or the like into a U shape with a predetermined width.

[0094] The above support plate (311) can be joined to the connecting clip (31) by welding or the like. Alternatively, the support plate (311) can be formed integrally with the connecting clip (31) by casting or the like.

[0095] The above fixed nut (33) is supported by being in close contact with the inner surface of the support plate (311), and the above connecting clip (31) is attached to the outer side of the outer surface of the support plate (311).

[0096] At this time, the space formed inside the support plate (311) can be formed with a width corresponding to the diameter of the upper steel wire (222) and the connecting steel wire (32). In addition, the internal width of the connecting clip (31) can be formed larger than the diameter of the upper steel wire (222) or the connecting steel wire (32).

[0097] Accordingly, when concrete is filled inside the connecting clip (31) during concrete pouring on site, the joint between the upper steel wire (222) and the connecting steel wire (32) can be wrapped and restrained.

[0098] When the head portion (321) is enlarged and formed at the end of the above-mentioned connecting wire (32), the head portion (321) can be placed in close contact with the inner end of the support plate (311).

[0099]

[0100] Figure 13 is a perspective view showing a truss deck equipped with a support member and a guide plate.

[0101] As shown in FIG. 2 and FIG. 13, the end of the truss girder (22) may be provided with a support member (23) to which an upper steel wire (222) is connected at the upper end and which is supported on the upper part of a beam (1) at the lower end, and a guide plate (24) may be provided at the front end of the truss deck (2a, 2b) to which the lower part of a plurality of support members (23) is fixed to the back surface and the lower part is fixed to the upper part of a beam (1).

[0102] Typically, the deck plate is installed as a vertical bar at the end of the truss girder (Fig. 1).

[0103] The straight beam is installed to support the ends of the upper steel wires that are not supported by the lattice material, and to prevent the deck plate from being blown away by strong winds or gusts, and to ensure safety during construction by preventing it from slipping and falling.

[0104] Conventionally, straight beams were installed on each truss girder and welded to the truss girder and the compensation surface. However, this had the disadvantage of requiring an excessive number of welding points, resulting in poor factory fabrication and field construction efficiency.

[0105] In the present invention, a support member (23) and a guide plate (24) may be provided to support the upper steel wire (222) of the truss girder (22) while minimizing the number of welding points on site.

[0106] The above support member (23) can be joined to the ends of the upper wire (222) and the lower wire (221) by welding or the like.

[0107] The lower end of the above support member (23) can be supported on the upper surface of the beam (1).

[0108] The above guide plate (24) can be provided at the end of the deck plate (21) in the width direction of the deck plate (21).

[0109] The lower part of the above guide plate (24) is fixed to the upper part of the beam (1).

[0110] The above guide plate (24) is provided in a vertical direction, and the lower part of the support member (23) can be joined to the back surface of the guide plate (24) by welding or the like.

[0111] The above guide plate (24) is arranged to cross multiple rows of truss girders (22) and can connect the support members (23) provided for each truss girder (22) to each other.

[0112] Since the above guide plate (24) is formed continuously in the width direction of the truss deck (2a, 2b), it is not necessary to individually weld and fix a plurality of support members (23) to the upper surface of the beam (1), but the guide plate (24) can be fixed to the upper surface of the beam (1) by welding or other methods only at the minimum position.

[0113] In addition, when the end of the lower wire (221) is pressed against the back surface of the guide plate (24), the compressive force by the lower wire (221) can be transmitted by the pressure of the guide plate (24).

[0114] If the above deck plate (21) is a UHPC panel, the guide plate (24) can serve as a formwork for the end of the deck plate (21).

[0115] Meanwhile, if the deck plate (21) is made of galvanized steel, the lattice material (223) of the truss girder (22) can be fixed to the deck plate (21) by welding or other methods.

[0116] And when the above deck plate (21) is a UHPC panel, when manufacturing the deck plate (21), the end of the lattice material (223) can be fixed to the back surface of the guide plate (24) by welding or other methods so as to fix the position of the lattice material (223) and secure the covering thickness (Fig. 13).

[0117]

[0118] Fig. 14 is a perspective view showing a truss girder equipped with a plate-shaped support member, and Fig. 15 is a perspective view showing the installation state of a truss deck equipped with the truss girder of Fig. 14.

[0119] As shown in FIGS. 14 and 15, the support member (23) can be formed in a plate shape and its lower end can be fixed to the upper part of the beam (1) by welding.

[0120] When the above support member (23) is fixed by welding to the upper part of the beam (1), the support member (23) takes the role of a shear stud, so there is no need to install a separate shear stud.

[0121] The end continuous truss deck structure of the present invention can be configured as a continuous point at the top of the beam by connecting the upper steel wires of the ends of the truss decks on both the left and right sides installed on the top of the beam with connecting members, thereby greatly reducing the bending moment and deflection for the load during use of the slab as well as the construction load, and can be configured as a long span without camber or temporary support, and since there is no need for a separate joint reinforcing bar or an anchorage length for reinforcing bar splice for the upper steel wire, the amount of reinforcing bar can be minimized, and thus has industrial applicability.

Claims

1. Bo (1); A pair of truss decks (2a, 2b) mounted on the upper surface of the beam (1) such that the ends are spaced apart from each other, each comprising a truss girder (22) composed of a deck plate (21) and a lower steel wire (221), an upper steel wire (222) provided on the upper side of the lower steel wire (221), and a lattice material (223) connecting the lower steel wire (221) and the upper steel wire (222); and A continuous end truss deck structure characterized by comprising a connecting member (3) that interconnects the upper steel wires (222) of the facing truss decks (2a, 2b); 2. In paragraph 1, The above connecting member (3) is characterized by comprising a pair of connecting clips (31) each connected to the ends of the upper wires (222) of the truss decks on both sides (2a, 2b) and a connecting wire (32) each of which ends are connected to the pair of connecting clips (31).

3. In paragraph 2, A single-ended continuous truss deck structure characterized in that the above connecting clip (31) is formed in a U shape, and the upper steel wire (222) and the connecting steel wire (32) are accommodated and fixed inside the connecting clip (31).

4. In paragraph 3, An end-continuous truss deck structure characterized in that a fixing nut (33) that is supported by being hooked on the inner end of the connecting clip (31) is fastened to the end of the above-mentioned connecting wire (32).

5. In paragraph 4, A continuous end truss deck structure characterized in that a U-shaped support plate (311) is provided on the inner end of the above connecting clip (31) to which the fixing nut (33) is hung and supported.

6. In paragraph 2, At the end of the above truss girder (22), an upper steel wire (222) is connected at the top, and a support member (23) is provided at the bottom to be supported on the upper part of the beam (1). A continuous end truss deck structure characterized in that the front end of the above truss deck (2a, 2b) is provided with a guide plate (24) having a lower portion of a plurality of support members (23) fixed to the back surface and a lower portion fixed to the upper portion of a beam (1).

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