Demounting-free bottom die steel bar truss floor support plate and mounting method

Abstract

The invention provides a disassembly-free bottom die steel bar truss floor support plate and an installation method. The disassembly-free bottom die steel bar truss floor support plate comprises a plurality of truss assemblies arranged on the surface of one side of a bottom die plate in parallel and reinforcing transverse steel bars vertically penetrating through and connected with the truss assemblies. Each truss assembly at least comprises a steel bar truss, two channel steel purlins, a fixed connecting piece, a connecting steel plate and a reinforcing vertical steel bar. According to the dismounting-free bottom die steel bar truss floor support plate and the mounting method provided by the embodiment of the invention, the additional bending rigidity provided by the channel steel purlines, the constraint of the connecting steel plates on the out-of-plane deformation of the channel steel purlines, the constraint of the reinforcing transverse steel bars and the reinforcing vertical steel bars on the out-of-plane deformation of the steel bar trusses and the like are utilized; under the working condition of concrete pouring, downwarping deformation of the floor support plate can be effectively reduced, and the maximum applicable span of support-free construction of the floor support plate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to a bottom formwork-free steel truss floor deck and an installation method thereof. Background Art

[0002] The steel truss floor decking that does not require dismantling of the bottom formwork is a new type of prefabricated floor slab component. It has the advantages of light hoisting weight and easy installation. It has certain application value in prefabricated building technology systems such as steel structure modular buildings or steel-concrete composite modular buildings, and has become increasingly popular in the market in recent years. For modular building technology, in order to improve the construction efficiency on the construction site, the interior decoration process of the lower surface of the floor slab is often completed in the factory during the module production and processing stage. When pouring floor slab concrete on site, in order to avoid damage or contamination of the interior decoration process on the lower surface of the floor slab due to the setting of temporary supports, modular building technology has put forward higher requirements on the maximum applicable span of the unsupported construction of the floor decking.

[0003] Prior art 1 (Announcement No. CN216428719 U) proposes a steel-shell cement fiberboard bottom formwork steel truss floor decking. The floor decking tightly laminates the steel strips on the surface of the cement fiberboard by means of the embedding effect of the triangular side teeth pressed into the interior of the cement fiberboard, and then welds the truss web bar feet to the surface of the steel strips. Among them, the steel strips mainly play the role of welding and connecting with the truss web bars, and the effect of improving the bending stiffness of the cement board is limited. The maximum applicable span of the unsupported construction is small. When pouring concrete, temporary support still needs to be set at the bottom of the floor slab, which is not conducive to the protection of the finished products in the interior decoration process.

[0004] Prior art 2 (publication number CN 111364659 A) proposes a new type of steel truss floor decking that does not require formwork removal. The floor decking is provided with multiple pads at the bottom of the steel truss along its length, and the steel truss is fixedly connected to the bottom plate through pads, positioning grooves, and limit bolts. Similar to prior art 1, the maximum applicable span of the unsupported construction of this scheme is also small, and temporary supports are still required at the bottom of the floor slab when pouring concrete, which increases the workload on site.

[0005] Therefore, there is an urgent need for a steel truss floor deck that does not require dismantling of the bottom formwork and can improve the maximum applicable span of unsupported construction. Summary of the invention

[0006] In order to solve the above problems, the purpose of the embodiments of the present invention is to provide a bottom formwork-free steel truss floor deck and an installation method.

[0007] In the first aspect, an embodiment of the present invention provides a bottom formwork-free steel truss floor decking, comprising: a plurality of truss assemblies arranged in parallel on one side surface of the bottom formwork, and reinforcing transverse steel bars vertically penetrating and connecting the plurality of truss assemblies; each of the truss assemblies comprises at least: a steel truss, two channel steel purlins, a fixed connector, a connecting steel plate and reinforcing vertical steel bars; the channel steel purlins are arranged sideways and installed on the bottom formwork surface through the fixed connectors; the steel truss is installed on one side surface of the channel steel purlin away from the bottom formwork; the connecting steel plate is horizontally spanned and fixedly installed between the two channel steel purlins at the ends and mid-span positions of the truss assemblies; the reinforcing vertical steel bars are fixedly connected to the connecting steel plate and the top of the steel truss.

[0008] Optionally, holes for installing the fixed connectors are reserved on the surface of the bottom template and the channel steel purlins.

[0009] Optionally, the fixed connection member is a screw-nut assembly.

[0010] Optionally, the channel steel purlin includes: an upper flange plate, a web plate and a lower flange plate; the steel truss is installed on the surface of the upper flange plate, and the lower flange plate is installed on the surface of the bottom template.

[0011] Optionally, a connecting steel plate spans across and is fixedly installed between the lower flange plates of the two channel steel purlins.

[0012] Optionally, the steel truss includes: a truss upper chord, a truss lower chord and a truss web; the truss lower chord is respectively connected to the surface of the channel steel purlin on one side away from the bottom formwork; the reinforcing vertical steel bars are fixedly connected to the connecting steel plate and the truss upper chord; the reinforcing transverse steel bars vertically penetrate the truss upper chord that connects multiple truss components.

[0013] Optionally, the steel bar truss and the channel steel purlin, the reinforcing vertical steel bars and the connecting steel plate and the top of the steel bar truss, and the connecting steel plate and the two channel steel purlins are all connected by welding.

[0014] Optionally, the material of the bottom template is a cement-based material; and the channel steel purlin is a galvanized steel plate.

[0015] In the second aspect, an embodiment of the present invention further provides an installation method, comprising: placing an installation bottom formwork, placing a channel steel purlin on the upper surface of the bottom formwork; placing a connecting steel plate between two channel steel purlins at the end and mid-span positions, and fixing the connecting steel plate, the channel steel purlin and the bottom formwork based on a fixed connecting piece; placing a steel truss on the upper surface of the channel steel purlin, and welding and fixing two truss lower chords of the steel truss to the channel steel purlin respectively; in the mid-span area, welding and fixing the reinforcing vertical steel bars to the connecting steel plate and the truss upper chords of the steel truss; in the mid-span area, welding and connecting the reinforcing transverse steel bars to the truss upper chords of the steel truss.

[0016] Optionally, after the reinforcing transverse steel bars are welded to the truss upper chords of the steel truss, the installation method further comprises: when assembly or construction is required, fixing the side of the channel steel purlin away from the steel truss to the beams at both ends.

[0017] In the solutions provided in the first and second aspects of the embodiments of the present invention, relying on the additional bending stiffness provided by the channel steel purlins, the constraint of the out-of-plane deformation of the channel steel purlins by the connecting steel plates, and the constraint of the out-of-plane deformation of the steel trusses by the reinforced transverse steel bars and the reinforced vertical steel bars, the downward deflection of the floor decking can be effectively reduced during concrete pouring conditions, thereby increasing its maximum applicable span for unsupported construction.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic plan view of a bottom formwork-free steel truss floor deck provided by an embodiment of the present invention is shown;

[0021] Figure 2 Shown along Figure 1 The schematic cross-sectional view along the short side of the floor decking plate is shown by the AA section line;

[0022] Figure 3 Shows Figure 2 A partial enlarged schematic diagram of

[0023] Figure 4 Shown along Figure 1 The cross-sectional view along the short side of the floor deck is shown by the CC section line;

[0024] Figure 5 Shown along Figure 1 The schematic cross-sectional view along the long side of the floor deck is shown by the BB section line;

[0025] Figure 6 A specific flow chart of an installation method provided by an embodiment of the present invention is shown.

[0026] icon:

[0027] 1- bottom formwork, 2- truss assembly, 3- reinforcing transverse steel bars, 4- beam, 21- steel truss, 22- channel steel purlin, 23- fixing connector, 24- connecting steel plate, 25- reinforcing vertical steel bars, 221- upper flange plate, 222- web plate, 223- lower flange plate, 211- truss upper chord, 212- truss lower chord, 213- truss web bar, 231- screw, 232- nut, 11- first bottom formwork, 12- second bottom formwork. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The embodiment of the present invention provides a bottom formwork-free steel truss floor deck, such as Figure 1 As shown, Figure 1 The schematic diagram of the plan view of the bottom formwork-free steel truss floor deck is shown. The bottom formwork-free steel truss floor deck comprises: a plurality of truss components 2 arranged in parallel on one side of the bottom formwork 1, and a reinforcing transverse steel bar 3 vertically penetrating and connecting the plurality of truss components 2. The reinforcing transverse steel bar 3 can provide the steel truss with an out-of-plane deformation constraint capability to control its instability deformation.

[0032] Specifically, see Figure 2 and Figure 3 As shown, Figure 2 Shown along Figure 1 The cross-sectional view along the short side of the floor deck is shown by the AA section line. Figure 3 Then Figure 2 A partial enlarged schematic diagram of Figure 3 As shown, each truss assembly 2 includes at least: a steel truss 21, two channel steel purlins 22, a fixed connector 23, a connecting steel plate 24 and a reinforcing vertical steel bar 25. Among them, the channel steel purlin 22 is in a C-shaped open channel shape, arranged sideways and installed on the surface of the bottom template 1 through the fixed connector 23; it can be understood that the sideways arrangement is to place one side of the short side of the opening on the bottom template 1, and the two channel steel purlins 22 can be arranged opposite to each other with the openings. In the embodiment of the present invention, the fixed connector 23 can be a self-tapping screw, etc., which will not be described here.

[0033] Secondly, the steel bar truss 21 is installed on the side surface of the channel steel purlin 22 away from the bottom template 1; it can be understood that the steel bar truss 21 is placed on the upper surface of the short side of the opening where the two channel steel purlins 22 are located above, that is, the two channel steel purlins 22 arranged sideways can be used to support the steel bar truss 21, so that the steel bar truss 21 is indirectly installed on the bottom template 1 through the two channel steel purlins 22. Further, for the end and mid-span position of the truss assembly 2, the embodiment of the present invention additionally sets a connecting steel plate 24, and by spanning and fixing the connecting steel plate 24 between the two channel steel purlins 22, the channel steel purlin 22 is provided with an out-of-plane deformation constraint capability to control its bending deformation. In addition, the embodiment of the present invention is also provided with a reinforcing vertical steel bar 25, and each reinforcing vertical steel bar 25 is fixedly connected to the connecting steel plate 24 and the top of the steel bar truss 21, providing the steel bar truss with an out-of-plane deformation constraint capability to control its instability deformation.

[0034] It should be noted that it can be used as an auxiliary reference Figure 4 Further understand the specific structure of the steel truss floor decking without dismantling the bottom formwork, among which, Figure 4 Shown along Figure 1 The cross-sectional diagram along the short side of the floor decking slab is shown by the CC section line.

[0035] The bottom formwork-free steel truss floor decking provided in the embodiment of the present invention relies on the additional bending stiffness provided by the channel steel purlin 22, the constraint of the out-of-plane deformation of the channel steel purlin 22 by the connecting steel plate 24, and the constraint of the out-of-plane deformation of the steel truss 21 by the reinforced transverse steel bars 3 and the reinforced vertical steel bars 25. It can effectively reduce the downward deflection of the floor decking during concrete pouring and increase its maximum applicable span for unsupported construction.

[0036] Optionally, holes for installing the fixed connector 23 are reserved on the surface of the bottom template 1 and the channel steel purlin 22 (not directly shown by reference numerals in the figure). It should be noted that the positions of the holes reserved on the channel steel purlin 22 and the holes (such as lead holes) reserved on the surface of the bottom template 1 need to keep the centers of the circles substantially coincident, so as to facilitate the subsequent connection operation using the fixed connector 23.

[0037] Alternatively, if Figure 3 As shown, the fixed connection member 23 is a screw-nut assembly. The embodiment of the present invention uses a screw-nut assembly as the fixed connection member 23, which is superior to the traditional self-tapping screw connection method. The use of a screw-nut assembly for connection is more reliable. Figure 3 As shown, the screw-nut assembly includes a screw 231 and a nut 232. The screw 231 can be sequentially passed through the reserved holes in the bottom template 1 and the channel steel purlin 22 from bottom to top, and through the connecting steel plate 24, and then the nut 232 is placed on the screw 231 from top to bottom, and the nut 232 is tightened with a tool such as an electric wrench, so as to fix the channel steel purlin 22 and the connecting steel plate 24 to the upper surface of the bottom template 1. It should be noted that the screw-nut assembly can be stainless steel or other types of materials whose durability and strength meet the requirements of the design specifications, and the embodiments of the present invention do not specifically limit this.

[0038] Alternatively, if Figure 3 As shown, the channel steel purlin 22 includes: an upper flange plate 221, a web plate 222 and a lower flange plate 223; the steel bar truss 21 is installed on the surface of the upper flange plate 221, and the lower flange plate 223 is installed on the surface of the bottom template 1. It should be noted that before the channel steel purlin 22 is bent and formed, a semicircular hole can be opened at a position of the steel plate corresponding to the upper flange plate 221 after bending and forming, and a circular hole can be opened at a position of the steel plate corresponding to the lower flange plate 223 after bending and forming, so as to be used for welding the steel bar truss 21 and installing and fixing the connecting piece 23.

[0039] Alternatively, if Figure 3 As shown, the connecting steel plate 24 spans and is fixedly installed between the lower flange plates 223 of the two channel steel purlins 22.

[0040] Alternatively, if Figure 3As shown, the steel truss 21 includes: a truss upper chord 211, a truss lower chord 212 and a truss web 213. The truss lower chord 212 is respectively connected to the surface of the channel steel purlin 22 away from the bottom formwork 1, that is, the two truss lower chords 212 are respectively fixedly connected to the upper flange plates 221 of the two channel steel purlins 22. The reinforcing vertical steel bars 25 are fixedly connected to the connecting steel plate 24 and the truss upper chord 211. It can be understood that the position corresponding to the truss upper chord 211 (the midline position of the steel truss 21 along the plate length) is the mid-span position of the truss assembly 2. The reinforcing transverse steel bars 3 vertically penetrate the truss upper chord 211 that connects multiple truss assemblies 2.

[0041] Optionally, the steel bar truss 21 and the channel steel purlin 22, the reinforcing vertical steel bars 25 and the connecting steel plate 24 and the top of the steel bar truss 21, and the connecting steel plate 24 and the two channel steel purlins 22 are all connected by welding.

[0042] In other words, the steel truss 21 is welded and fixed to the upper flange plate 221 of the channel steel purlin 22. For example, the steel truss 21 can be fixedly connected to the channel steel purlin 22 by electric welding at a certain interval along the length direction of the floor deck. The reinforcing vertical steel bars 25 are welded and fixed to the connecting steel plate 24 and the truss upper chord 211 of the steel truss 21. The connecting steel plate 24 is welded and fixed to the lower flange plates 223 of the two channel steel purlins 22.

[0043] Optionally, the material of the bottom template 1 is a cement-based material or other types of materials whose durability and strength meet the requirements of the design specifications, preferably a cement-based material. The channel steel purlin 22 is a galvanized steel plate or other types of materials whose durability and strength meet the requirements of the design specifications, preferably a galvanized steel plate. It should be noted that in the embodiment of the present invention, the steel truss 21, the connecting steel plate 24, the reinforcing transverse steel bars 3, and the reinforcing vertical steel bars 25 can all be ordinary steel or other types of materials whose durability and strength meet the requirements of the design specifications, and no excessive restrictions are made here.

[0044] Compared with the prior art, the bottom formwork-free steel truss floor deck provided by the embodiment of the present invention has the following beneficial effects:

[0045] 1. During the floor decking processing, the bottom template does not need to be turned over, reducing the risk of cracking and deformation of the bottom template;

[0046] 2. Compared with the traditional self-tapping screw connection method, the screw and nut combination connection method is stronger and safer;

[0047] 3. Channel steel purlins provide additional bending stiffness and coordinated deformation capacity for the floor deck, reducing the deflection of the floor slab during concrete pouring and normal use;

[0048] 4. The welding surface between the upper flange plate of the channel steel purlin and the lower chord of the steel truss is large, which improves the welding quality and the tensile and shear bearing capacity of the connection node area;

[0049] 5. The connecting steel plate provides the out-of-plane deformation constraint capability for the lower flange plate of the channel steel purlin to control its bending deformation;

[0050] 6. The reinforced transverse steel bars and reinforced vertical steel bars provide out-of-plane deformation restraint capacity for the upper chord of the steel truss, thereby controlling its unstable deformation.

[0051] 7. Channel steel purlins can be fixedly connected to the two end beams, providing greater shear bearing capacity for the floor deck. Figure 5 Further understanding, Figure 5 Shown along Figure 1 In the schematic cross-sectional view along the long side of the floor decking plate shown by the BB section line, the beam is indicated by the reference numeral 4.

[0052] In addition, the embodiment of the present invention also provides an installation method, such as Figure 6 As shown, the installation method includes the following steps 601-603.

[0053] Step 601: Place and install the bottom template, and place the channel steel purlins on the upper surface of the bottom template.

[0054] In the embodiment of the present invention, the number of bottom templates can be configured according to actual needs, such as Figure 1 As shown, this embodiment uses two bottom templates for installation, namely a first bottom template 11 and a second bottom template 12. The first bottom template 11 and the second bottom template 12 can be aligned and laid flat, and holes are reserved at the positions of the fixed connecting parts, and the channel steel purlins are placed on the upper surface of the bottom template.

[0055] Step 602: At the end and mid-span positions, the connecting steel plate is placed between two channel steel purlins, and the connecting steel plate, the channel steel purlin and the bottom formwork are fixedly connected based on the fixed connectors.

[0056] The end is the end of the steel truss, and the mid-span position is the position of the top of the steel truss, such as the position corresponding to the chord 211 of the steel truss. At the end and mid-span positions, the connecting steel plate is placed between two channel steel purlins, and the connecting steel plate, the channel steel purlin and the bottom template are fixedly connected based on fixed connectors (such as screw and nut assemblies). For example, screws are sequentially passed through the bottom template and the channel steel lower flange plate and the connecting steel plate from bottom to top, and then nuts are placed on the screws from top to bottom, and the nuts are tightened with tools such as electric wrenches, so that the channel steel purlins and the connecting steel plates are fixed to the upper surface of the bottom template.

[0057] Step 603: Place the steel truss on the upper surface of the channel steel purlin, and weld the two lower chords of the steel truss to the channel steel purlin respectively; in the mid-span area, weld the reinforcing vertical steel bars to the upper chords of the truss connecting the steel plate and the steel truss; in the mid-span area, weld the reinforcing transverse steel bars to the upper chords of the truss of the steel truss.

[0058] The installation method provided in the embodiment of the present invention relies on the additional bending stiffness provided by the channel steel purlins, the constraint of the out-of-plane deformation of the channel steel purlins by the connecting steel plates, and the constraint of the out-of-plane deformation of the steel trusses by the reinforced transverse steel bars and the reinforced vertical steel bars. It can effectively reduce the downward deflection of the floor decking during concrete pouring and increase its maximum applicable span for unsupported construction.

[0059] Optionally, after the above step 603 of “welding the reinforcing transverse steel bars to the truss upper chord bars of the steel bar truss”, the installation method may further include the following steps:

[0060] In the case of assembly or construction, for example, when assembling in a modular building factory or on-site construction of a traditional prefabricated building, the side of the channel steel purlin away from the steel truss is fixedly connected to the beams at both ends, that is, Figure 5 As shown, the lower flange plate of the channel steel purlin can be fixedly connected to the beams 4 at both ends, thereby providing a greater shear bearing capacity for the floor deck.

[0061] The above is only one specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution that can be easily changed, replaced or optimized by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A steel bar truss floor decking plate without dismantling the bottom formwork, characterized in that: include: A plurality of truss assemblies (2) arranged in parallel on a surface of one side of the bottom template (1), and reinforcing transverse steel bars (3) vertically penetrating and connecting the plurality of truss assemblies (2); Each of the truss assemblies (2) comprises at least: a steel truss (21), two channel steel purlins (22), a fixed connector (23), a connecting steel plate (24) and a reinforcing vertical steel bar (25); The channel steel purlin (22) is arranged sideways and is installed on the surface of the bottom formwork (1) through the fixed connection piece (23); the steel bar truss (21) is installed on the side surface of the channel steel purlin (22) away from the bottom formwork (1); with respect to the end and mid-span position of the truss assembly (2), the connecting steel plate (24) is spanned and fixedly installed between the two channel steel purlins (22); the reinforcing vertical steel bars (25) are fixedly connected to the connecting steel plate (24) and the top of the steel bar truss (21).

2. The bottom formwork-free steel truss floor deck according to claim 1 is characterized in that: Holes for installing the fixing connector (23) are reserved on the surface of the bottom template (1) and the channel steel purlin (22).

3. The bottom formwork-free steel truss floor deck according to claim 1 is characterized in that: The fixed connection part (23) is a screw and nut assembly.

4. The bottom formwork-free steel truss floor deck according to claim 1 is characterized in that: The channel steel purlin (22) comprises: an upper flange plate (221), a web plate (222) and a lower flange plate (223); the steel bar truss (21) is installed on the surface of the upper flange plate (221), and the lower flange plate (223) is installed on the surface of the bottom template (1).

5. The bottom formwork-free steel truss floor deck according to claim 4 is characterized in that: The connecting steel plate (24) spans and is fixedly installed between the lower flange plates (223) of the two channel steel purlins (22).

6. The bottom formwork-free steel truss floor deck according to claim 1 is characterized in that: The steel bar truss (21) comprises: a truss upper chord (211), a truss lower chord (212) and a truss web (213); The truss lower chord (212) is respectively connected to the surface of one side of the channel steel purlin (22) away from the bottom formwork (1); the reinforcing vertical steel bars (25) are fixedly connected to the connecting steel plate (24) and the truss upper chord (211); the reinforcing transverse steel bars (3) vertically penetrate the truss upper chord (211) connecting the plurality of truss assemblies (2).

7. The bottom formwork-free steel truss floor deck according to claim 1 is characterized in that: The steel bar truss (21) and the channel steel purlin (22), the reinforcing vertical steel bars (25) and the connecting steel plate (24) and the top of the steel bar truss (21), and the connecting steel plate (24) and the two channel steel purlins (22) are all connected by welding.

8. The bottom formwork-free steel truss floor deck according to claim 1 is characterized in that: The material of the bottom template (1) is a cement-based material; the channel steel purlin (22) is a galvanized steel plate.

9. An installation method, characterized in that: include: Place and install the bottom template, and place the channel steel purlin on the upper surface of the bottom template; At the end and mid-span positions, a connecting steel plate is placed between two channel steel purlins, and the connecting steel plate, the channel steel purlin and the bottom formwork are fixedly connected based on a fixed connector; The steel truss is placed on the upper surface of the channel steel purlin, and the two lower chords of the steel truss are respectively welded and fixed to the channel steel purlin; in the mid-span area, the reinforcing vertical steel bars are welded and fixed to the connecting steel plate and the upper chord of the truss of the steel truss; in the mid-span area, the reinforcing transverse steel bars are welded and connected to the upper chord of the truss of the steel truss.

10. The installation method according to claim 9, characterized in that: After the reinforcing transverse steel bars are welded to the truss upper chord bars of the steel bar truss, the method further comprises: When assembly or construction is required, the side of the channel steel purlin away from the steel bar truss is fixedly connected to the beams at both ends.

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