Open steel-concrete composite truss floor

Abstract

An open steel-concrete composite truss floor comprises a truss frame, a first plate body and a second plate body arranged horizontally and stacked up and down, the truss frame comprises an upper chord arm and a plurality of diagonal bracing members, each of the diagonal bracing members comprises a left diagonal brace rod and a right diagonal brace rod arranged symmetrically about the upper chord arm, the lower parts of the left diagonal brace rod and the right diagonal brace rod are pre-buried in the first plate body and the second plate body, the cross section of the upper chord arm is a U-shaped cavity structure with an open top, and concrete is poured in the U-shaped cavity structure. The present invention has the following technical effects: easy pouring and grouting, high connection strength, light weight, low cost, and stronger support stability.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to an open steel-concrete composite truss floor. Background Art

[0002] In recent years, composite concrete floors with trusses have the advantages of high construction efficiency and low construction cost, and are increasingly widely used in the construction industry. The utility model patent with the authorization announcement number CN 202866084 U discloses a concrete composite floor with a floor bracket on a truss. The concrete floor has the following technical problems during on-site construction: when pouring concrete in the cavity inside the upper chord arm, grouting needs to be performed from both ends, which is not only inconvenient to operate, but also the concrete poured inside is not dense; the upper chord arm adopts a square tube or a round tube, and the upper end of the inclined support ribs must be welded to the tube wall of the upper chord arm. In order to weld firmly, this requires the tube wall of the upper chord arm to be thicker, which leads to a large weight and high cost of the entire concrete floor; in addition, the connection strength between the upper chord arm and the lower plate body cannot be ensured by simply welding a number of inclined support ribs to the upper chord arm. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the present invention provides an open steel-concrete composite truss floor which is easy to cast and grout, has high connection strength, is light in weight and has low cost.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: an open steel-concrete composite truss floor, comprising a truss frame, a first plate body and a second plate body arranged horizontally and superimposed on each other, the second plate body is located on the upper part of the first plate body, a first steel bar frame is arranged in the first plate body, a second steel bar frame is arranged in the second plate body, the lower part of the truss frame is arranged inside the first plate body and the second plate body, a mounting frame is horizontally arranged on the top of the truss frame, the truss frame comprises an upper chord arm and a plurality of diagonal bracing members, the upper chord arm is horizontally arranged in the front-rear direction The upper chord arm is arranged flat, and the diagonal bracing members are evenly arranged along the length direction of the upper chord arm. Each group of diagonal bracing members includes a left diagonal brace rod and a right diagonal brace rod which are arranged symmetrically about the upper chord arm. The lower parts of the left diagonal brace rod and the right diagonal brace rod are pre-buried in the first plate body and the second plate body. The left diagonal brace rod is arranged obliquely to the right from bottom to top, and the right diagonal brace rod is arranged obliquely to the left from bottom to top. The upper part of the left diagonal brace rod is fixedly connected to the left side of the upper chord arm, and the upper part of the right diagonal brace rod is fixedly connected to the right side of the upper chord arm. The cross-section of the upper chord arm is a U-shaped cavity structure with an open top, and concrete is poured in the U-shaped cavity structure.

[0005] The top of the left side wall of the U-shaped cavity structure of the upper chord arm is bent 90° to the right to form a left strip, and the top of the right side wall of the U-shaped cavity structure of the upper chord arm is bent 90° to the left to form a right strip, and there is a gap between the left strip and the right strip for pouring concrete.

[0006] The right side of the left strip is bent downward by 90° to form a left reinforcing rib, and the right side of the right strip is bent downward by 90° to form a right reinforcing rib.

[0007] The upper parts of the left and right diagonal braces are both vertically arranged flat structures, which are in contact with the side surfaces of the upper chord arm and are spot welded together. Left and right transparent through holes are correspondingly opened between the flat structure on the upper part of the left diagonal brace, the flat structure on the upper part of the right diagonal brace, and the left and right walls of the upper chord arm. Connecting ribs are inserted in the through holes, and the left and right ends of the connecting ribs protrude from the flat structures on the left and right sides respectively and are welded together with the flat structures, and the middle part of the connecting ribs is pre-buried in the concrete in the U-shaped cavity structure.

[0008] A plurality of through holes are provided at the bottom of the U-shaped cavity structure of the upper chord arm, and the through holes are evenly spaced along the length direction of the upper chord arm, and two adjacent through holes are symmetrically arranged front and back about the connecting rib, and a straight support rod is vertically inserted into each through hole, the upper end of the straight support rod extends out of the upper chord arm, and the lower end of the straight support rod extends into and is embedded in the first plate body and the second plate body.

[0009] Using the above technical solution, the manufacturing process of the present invention is as follows:

[0010] (1) Setting up the formwork, setting up the first steel frame in the formwork, and setting up the straight brace, the left diagonal brace, and the right diagonal brace at the set position, and tying the lower ends of the straight brace, the left diagonal brace, and the right diagonal brace to the first steel frame as a whole;

[0011] (2) pouring concrete into the formwork to form the first slab after solidification;

[0012] (3) a second steel frame is arranged on the first plate body, and the straight bracing rods, the left diagonal bracing rods and the right diagonal bracing rods are tied together with the first steel frame;

[0013] (4) pouring concrete on the first plate body in the formwork, and forming the second plate body after solidification;

[0014] (5) Move the upper chord arm downward from between the upper parts of the left and right diagonal struts, align the through holes at the bottom of the upper chord arm with each straight strut, and allow the upper ends of the straight struts to pass through the through holes and extend into the U-shaped cavity structure of the upper chord arm until the through holes on the flat structure on the upper part of the left diagonal strut, the through holes on the flat structure on the upper part of the right diagonal strut, and the through holes on the left and right walls of the upper chord arm are connected, and then spot weld the flat structure to the upper chord arm to temporarily fix the upper chord arm;

[0015] (6) Pass the connecting ribs through the through holes on the left and right sides, and weld and fix the left and right ends of the connecting ribs to the flat structure on the left and the flat structure on the right respectively;

[0016] (7) Pour concrete into the U-shaped cavity structure of the upper chord arm so that the connecting reinforcement, straight support rod and upper chord arm are cast as one piece;

[0017] (8) Finally, fix the mounting frame on the upper arm.

[0018] By adopting the above technical solution, the present invention has the following technical effects compared with the prior art:

[0019] 1. The upper ends of the left and right diagonal braces used in the present invention are configured as flat structures, which can increase the contact area between the flat structures and the side surfaces of the upper chord arms, and the support has stronger stability;

[0020] 2. The flat structure is only spot welded to the upper chord arm, which temporarily fixes the upper chord arm and minimizes the wall thickness of the upper chord arm, thereby reducing the weight of the upper chord arm;

[0021] 3. The upper chord arm, the left diagonal brace and the right diagonal brace are connected as a whole through connecting ribs, which has stronger supporting connection strength than welding. This connection method reduces welding and provides support for reducing the wall thickness of the upper chord arm;

[0022] 4. The upper chord arm with an open top is particularly suitable for pouring concrete inside the U-shaped cavity structure of the upper chord arm, which can make the concrete pouring in the U-shaped cavity structure more compact, and the connecting ribs and straight support rods also play a role in ensuring that the concrete and the upper chord arm have good connection strength;

[0023] 5. The left strip, right strip, left reinforcing rib and right reinforcing rib play the role of enhancing the strength of the upper chord arm, and at the same time play the role of further enhancing the connection strength with the concrete;

[0024] 6. Due to the setting of the straight support rod, the setting density of the left oblique support rod and the right oblique support rod is reduced, which also reduces the weight and reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 yes Figure 1 A top view of

[0027] Figure 3 yes Figure 1 A schematic structural diagram of a second embodiment of the upper chord arm;

[0028] Figure 4 yes Figure 1 Schematic diagram of the structure of the third implementation method of the upper chord arm. DETAILED DESCRIPTION

[0029] like Figure 1 and Figure 2As shown, an open steel-concrete composite truss floor of the present invention comprises a truss frame, a first plate body 1 and a second plate body 2 which are horizontally arranged and overlapped up and down, the second plate body 2 is located on the upper part of the first plate body 1, a first steel bar frame 3 is arranged in the first plate body 1, a second steel bar frame 4 is arranged in the second plate body 2, the lower part of the truss frame is arranged inside the first plate body 1 and the second plate body 2, a mounting frame (not shown in the figure) is horizontally arranged on the top of the truss frame, the truss frame comprises an upper chord arm 6 and a plurality of diagonal bracing members, the upper chord arm 6 is horizontally arranged along the front-back direction, and the diagonal bracing members They are evenly arranged along the length direction of the upper chord arm 6, and each group of diagonal bracing members includes a left diagonal brace rod 7 and a right diagonal brace rod 8 which are symmetrically arranged about the upper chord arm 6. The lower parts of the left diagonal brace rod 7 and the right diagonal brace rod 8 are pre-buried in the first plate body 1 and the second plate body 2. The left diagonal brace rod 7 is tilted to the right from bottom to top, and the right diagonal brace rod 8 is tilted to the left from bottom to top. The upper part of the left diagonal brace rod 7 is fixedly connected to the left side of the upper chord arm 6, and the upper part of the right diagonal brace rod 8 is fixedly connected to the right side of the upper chord arm 6. The cross-section of the upper chord arm 6 is a U-shaped cavity structure 16 with an open top, and concrete 9 is poured in the U-shaped cavity structure 16.

[0030] The upper parts of the left diagonal brace 7 and the right diagonal brace 8 are both vertically arranged flat structures 10, which are in contact with the side of the upper chord arm 6 and spot-welded as a whole. The flat structure 10 on the upper part of the left diagonal brace 7, the flat structure 10 on the upper part of the right diagonal brace 8, and the left and right walls of the upper chord arm 6 are correspondingly provided with left and right transparent through holes, and connecting ribs 11 are penetrated in the through holes. The left and right ends of the connecting ribs 11 respectively protrude from the flat structures 10 on the left and right sides and are welded to the flat structures 10 as a whole, and the middle part of the connecting ribs 11 is pre-buried in the concrete 9 in the U-shaped cavity structure 16.

[0031] A plurality of through holes are provided at the bottom of the U-shaped cavity structure 16 of the upper chord arm 6, and the through holes are evenly spaced along the length direction of the upper chord arm 6, and two adjacent through holes are symmetrically arranged front to back about the connecting rib 11, and a straight support rod 12 is vertically inserted into each through hole, and the upper end of the straight support rod 12 extends out of the upper chord arm 6, and the lower end of the straight support rod 12 extends into and is embedded in the first plate body 1 and the second plate body 2.

[0032] The production process and steps of the present invention are:

[0033] (1) Setting up a formwork, setting a first steel frame 3 in the formwork, and setting straight braces 12, left diagonal braces 7, and right diagonal braces 8 at set positions, and tying the lower ends of the straight braces 12, left diagonal braces 7, and right diagonal braces 8 to the first steel frame 3 as a whole;

[0034] (2) pouring concrete into the formwork to form a first plate body 1 after solidification;

[0035] (3) a second steel frame 4 is arranged on the first plate body 1, and the straight brace 12, the left diagonal brace 7 and the right diagonal brace 8 are tied together with the first steel frame 3;

[0036] (4) pouring concrete on the first plate body 1 in the formwork, and forming the second plate body 2 after solidification;

[0037] (5) Move the upper arm 6 downward from between the upper parts of the left diagonal strut 7 and the right diagonal strut 8, align the through holes at the bottom of the upper arm 6 with each straight strut 12, and allow the upper ends of the straight struts 12 to pass through the through holes and extend into the U-shaped cavity structure 16 of the upper arm 6, until the through holes provided on the flat structure 10 at the upper part of the left diagonal strut 7, the through holes provided on the flat structure 10 at the upper part of the right diagonal strut 8, and the through holes provided on the left and right walls of the upper arm 6 are correspondingly connected, and then spot weld the flat structure 10 and the upper arm 6 to temporarily fix the upper arm 6;

[0038] (6) Pass the connecting rib 11 through the through holes on the left and right sides, and weld and fix the left and right ends of the connecting rib 11 to the flat structure 10 on the left and the flat structure 10 on the right, respectively;

[0039] (7) pouring concrete 9 into the U-shaped cavity structure 16 of the upper chord arm 6 so that the connecting reinforcement 11, the straight support rod 12 and the upper chord arm 6 are cast as one piece;

[0040] (8) Finally, the mounting frame is fixedly mounted on the upper chord arm 6.

[0041] Embodiment 2: Figure 3 As shown, the difference between this embodiment and the first embodiment is that the top of the left side wall of the U-shaped cavity structure 16 of the upper chord arm 6 is bent 90° to the right to form a left strip 5, and the top of the right side wall of the U-shaped cavity structure 16 of the upper chord arm 6 is bent 90° to the left to form a right strip 13, and there is a gap between the left strip 5 and the right strip 13 for pouring concrete.

[0042] Embodiment 3: Figure 4 As shown, the difference between this embodiment and the second embodiment is that the right side of the left strip 5 is bent downward by 90° to form a left reinforcing rib 14 , and the right side of the right strip 13 is bent downward by 90° to form a right reinforcing rib 15 .

[0043] This embodiment does not impose any formal limitation on the shape, material, structure, etc. of the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An open steel-concrete composite truss floor, comprising a truss frame, a first plate body and a second plate body arranged horizontally and stacked up and down, the second plate body is located on the upper part of the first plate body, a first steel bar frame is arranged in the first plate body, a second steel bar frame is arranged in the second plate body, the lower part of the truss frame is arranged inside the first plate body and the second plate body, and a mounting frame is horizontally arranged on the top of the truss frame, characterized in that: The truss skeleton includes an upper chord arm and a plurality of groups of diagonal bracing members. The upper chord arm is horizontally arranged in the front-rear direction. The diagonal bracing members are evenly arranged along the length direction of the upper chord arm. Each group of diagonal bracing members includes a left diagonal bracing rod and a right diagonal bracing rod that are arranged symmetrically about the upper chord arm. The lower parts of the left diagonal bracing rod and the right diagonal bracing rod are pre-buried in the first plate body and the second plate body. The left diagonal bracing rod is tilted to the right from bottom to top, and the right diagonal bracing rod is tilted to the left from bottom to top. The upper part of the left diagonal bracing rod is fixedly connected to the left side of the upper chord arm, and the upper part of the right diagonal bracing rod is fixedly connected to the right side of the upper chord arm. The cross section of the upper chord arm is a U-shaped cavity structure with an open top, and concrete is poured in the U-shaped cavity structure. The top of the left side wall of the U-shaped cavity structure of the upper chord arm is bent rightward 90° to form a left strip, and the top of the right side wall of the U-shaped cavity structure of the upper chord arm is bent leftward 90° to form a right strip, and there is a gap between the left strip and the right strip for pouring concrete; The right side of the left strip is bent downward 90° to form a left reinforcing rib, and the right side of the right strip is bent downward 90° to form a right reinforcing rib; The upper parts of the left and right diagonal braces are both vertically arranged flat structures, the flat structures are in contact with the side surfaces of the upper chord arm and are spot welded as a whole, and left and right through holes are correspondingly opened between the flat structures on the upper part of the left and right diagonal braces, the flat structures on the upper part of the right and left diagonal braces, and the left and right walls of the upper chord arm, and connecting ribs are inserted in the through holes, and the left and right ends of the connecting ribs protrude from the flat structures on the left and right sides respectively and are welded as a whole with the flat structures, and the middle part of the connecting ribs is pre-buried in the concrete in the U-shaped cavity structure; A plurality of through holes are provided at the bottom of the U-shaped cavity structure of the upper chord arm, and the through holes are evenly spaced along the length direction of the upper chord arm, and two adjacent through holes are symmetrically arranged front and back about the connecting rib, and a straight support rod is vertically inserted into each through hole, the upper end of the straight support rod extends out of the upper chord arm, and the lower end of the straight support rod extends into and is embedded in the first plate body and the second plate body; The straight brace, the left diagonal brace and the right diagonal brace are all bound together with the first steel bar skeleton.

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