Prefabricated steel-concrete composite beam and variable-plate-thickness prefabricated beam

Abstract

The utility model relates to a prefabricated steel-concrete composite beam and a variable-plate-thickness prefabricated beam. The prefabricated steel-concrete composite beam comprises a prefabricated groove-shaped beam shell and a beam shell, wherein the beam shell is composed of a bottom plate, webs on the two sides and a plurality of pieces of top connecting profile steel, a pouring cavity is formed in the middle of the beam shell, and a pouring opening is formed in the upper portion of the beam shell; the upper reinforcing steel is arranged on the upper end face of the side web and at least covers the upper end face and the outer side face of the side web; the lower reinforcing steel is arranged on the lower end face of the side web and at least covers the lower end face and the inner side face of the side web; the beam end connecting beam steel plate is arranged on the bottom steel plate, the bottom of the beam end connecting beam steel plate is connected with the bottom steel plate, and the beam end connecting beam steel plate is perpendicular to the bottom steel plate; a connecting part is arranged between the side web plates and connected to the middle portions of the two side web plates so as to bear lateral tension of the two side web plates generated by concrete pouring. The device can be assembled and transported on a production line, and is reliable in quality, high in efficiency and low in cost.

Description

Technical Field

[0001] This utility model relates to the field of construction, and in particular to a precast steel-concrete composite beam and a precast beam with variable slab thickness. Background Technology

[0002] Reinforced concrete columns are cost-effective components in building structures, characterized by high compressive strength, high lateral stiffness, excellent fire resistance, and low cost.

[0003] Existing reinforced concrete cast-in-place structures all employ on-site construction methods involving the installation of scaffolding, formwork, and rebar tying, followed by concrete pouring. This method involves numerous on-site procedures, high consumption of reusable materials, low efficiency, poor precision, and difficulty in guaranteeing quality. In particular, given the current rising labor costs in the construction market, construction costs have increased dramatically. Summary of the Invention

[0004] In order to overcome at least one of the problems mentioned above, this utility model provides a precast steel-concrete composite beam and a variable thickness precast beam, which can be assembled and transported on the production line, with reliable quality, high efficiency and low cost.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a precast steel-concrete composite beam comprising:

[0006] The precast trough-shaped beam shell is a beam shell consisting of a bottom plate, two side webs and multiple top connecting steel sections forming a grouting cavity in the middle and a grouting opening at the top.

[0007] The upper reinforcing steel is provided on the upper surface of the side web plate, covering at least the upper surface and outer surface of the side web plate, and the upper end of the upper reinforcing steel extends to the center, with multiple pre-reserved holes evenly provided on the extension.

[0008] The lower reinforcing steel is provided on the lower end face of the side web plate, and at least covers the lower end face and inner side face of the side web plate.

[0009] The connecting beam steel plate is set on the bottom steel plate, connected to the bottom steel plate at the bottom, perpendicular to the bottom steel plate, and has part of it extending out of the bottom steel plate and part of it extending into the bottom steel plate, for connecting with external beams and columns;

[0010] At least one connecting component is provided between the side webs, and the connecting component is connected to the middle of the two side webs to bear the tensile force generated by the pouring of concrete on the two side webs.

[0011] Preferably, the connecting component includes a waist truss and at least one waist tie bar respectively disposed in the side web plate. The waist truss includes a lower chord bar and an upper chord bar. The lower chord bar is disposed along the length direction of the side web plate and is fixedly connected to the inner side surface of the side web plate. The upper chord bar protrudes out of the side web plate. The lower chord bar and the upper chord bar are connected to each other or are an integral structure on both sides. The waist tie bar is connected to the upper chord bars on both sides.

[0012] Preferably, the lower chord reinforcement is a linear structure, pre-embedded in the side web; the upper chord reinforcement is a linear structure continuously welded to the lower chord reinforcement by regular wavy steel bars.

[0013] Preferably, the side web is made of UHPC ultra-high performance concrete; the lower chord reinforcement is embedded in the side web.

[0014] Preferably, a beam stirrup frame is provided on the upper part of the side web, the beam stirrup frame has an open U-shaped structure (opening downwards), and the two ends of the beam stirrup frame are respectively inserted into the reserved holes of the two side reinforcing steels; additional beam surface reinforcing bars are provided on the upper and / or lower ends of the beam stirrup frame to form a reinforcing steel skeleton.

[0015] Preferably, the upper and lower reinforcing steels are angle steel structures.

[0016] Preferably, the upper chord is provided with an inner chord tie bar, which is inserted into the upper chord, and the waist tie bar is hooked to the inner chord tie bars on both sides.

[0017] This utility model also provides a variable thickness precast beam, including the above-mentioned precast steel-concrete composite beam, wherein the heights of the two webs are different, which facilitates the installation of floor slabs with different thicknesses on both sides of the beam.

[0018] The beneficial effects of this utility model are: precast steel-concrete composite beams and variable thickness precast beams.

[0019] 1) No on-site formwork or scaffolding is required, significantly reducing the amount of beam reinforcement binding;

[0020] 2) The beam shell is a prefabricated U-shaped channel component. The side webs can be made into different heights according to the requirements to form a variable thickness prefabricated beam. It is lightweight, easy to transport and install, and low in cost.

[0021] 3) Minimal or no temporary supports are needed during installation, saving on temporary costs and shortening the construction period;

[0022] 4) Factory manufacturing, fast speed, high efficiency, and high precision; on-site mechanical installation.

[0023] 5) Less on-site work and higher construction efficiency;

[0024] 6) After the precast beam installation is completed, the beam concrete and slab concrete in the precast beam slot are poured as a whole, resulting in a good overall shape.

[0025] 7) Low cost. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a schematic diagram of the overall structure of the precast steel-concrete composite beam described in this invention;

[0028] Figure 2 This is a side view schematic diagram of the precast steel-concrete composite beam described in this invention;

[0029] Figure 3 yes Figure 1 Simplified diagram in the image;

[0030] Figure 4 This is a structural schematic diagram of the bottom steel plate and the connecting beam steel plate of the precast steel-concrete composite beam described in this invention;

[0031] Figure 5 This is a schematic diagram of the side web structure of the precast steel-concrete composite beam described in this invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Precast channel beam shell; 11. Bottom steel plate; 111. Additional reinforcement at the bottom of the beam; 12. Side web plate; 13. Upper reinforcing steel; 14. Lower reinforcing steel; 15. Connecting beam steel plate; 152. Upper flange plate of the connecting beam; 151. Reserved bolt connection holes; 16. Web truss; 161. Lower chord reinforcement; 162. Upper chord reinforcement; 163. Inner chord tie bar; 17. Web tie bar; 18. Additional reinforcement on the beam surface; 181. Beam stirrup frame; 19. Top connecting steel. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0037] like Figure 1-4 The precast steel-concrete composite beam shown consists of a precast trough-shaped beam shell 1, upper reinforcing steel 13, lower reinforcing steel 14, and connecting beam steel plate 15. It can be assembled on the production line and then transported to the construction site for installation. After the composite beam and floor slab are installed, the concrete in the trough and the floor slab are poured as a whole. The quality is reliable, and the production efficiency is greatly improved and the cost is reduced.

[0038] The precast trough-shaped beam shell 1 is a beam shell consisting of a bottom steel plate 11, two side webs 12 and multiple top connecting steel sections 19, forming a grouting cavity in the middle and a grouting opening at the top; connecting components are installed between the webs to bear the tensile force generated by the two side webs 12.

[0039] The upper reinforcing steel 13 is disposed on the upper end face of the side web plate 12, at least covering the upper end face and outer side face of the side web plate 12. In this embodiment, the upper reinforcing steel 13 adopts an angle steel structure, the upper end face is wider than the thickness of the side web plate 12, extends towards the middle, and has a reserved hole for subsequent installation of other connecting components.

[0040] The lower reinforcing steel 14 adopts an angle steel structure and is set on the lower end face of the side web plate 12, at least covering the lower end face and inner side face of the side web plate 12; wherein, the upper reinforcing steel 13, the lower reinforcing steel 14 and the side web plate 12 have pre-embedded nails on their contact surfaces, which penetrate into the side web plate 12.

[0041] See Figure 4A connecting beam steel plate 15 is disposed on a bottom steel plate 11, connected to the bottom of the bottom steel plate 11, perpendicular to the bottom steel plate 11, and partially extending out of the bottom steel plate 11 and partially extending into the bottom steel plate 11 for connection with external beams and columns. The protruding part of the connecting beam steel plate 15 has reserved bolt connection holes 151. The upper part of the connecting beam steel plate 15 has a connecting upper flange plate 152.

[0042] For details, see Figure 5 The connecting components include a waist truss 16 and at least one waist tie 17 respectively disposed in the side web plate 12. The waist truss 16 is composed of a lower chord 161 and an upper chord 162. The lower chord 161 is disposed along the length direction of the side web plate 12 and is fixedly connected to the inner side surface of the side web plate 12. The upper chord 162 protrudes out of the side web plate 12. The lower chord 161 and the upper chord 162 are connected or are an integral structure on both sides. The waist tie 17 is connected to the upper chord 162 on both sides.

[0043] In this embodiment, the lower chord bar 161 is a linear structure; it is embedded in the side web plate, and the upper chord bar 162 is a linear structure that is continuously welded to the lower chord bar through regular wavy steel bars.

[0044] In one possible implementation, the lower chord 161 is a porous mesh or porous plate structure that extends along the length of the side web; the upper chord 162 is a spiral or cross-shaped continuous steel wire structure inserted into the holes / mesh of the lower chord 161.

[0045] The side web plate 12 is made of UHPC ultra-high performance concrete; the lower chord reinforcement 161 is embedded in the side web plate 12.

[0046] See Figure 1 , 2 A beam stirrup frame 181 is installed on the upper part of the side web plate 12. The beam stirrup frame has a U-shaped opening structure with the opening facing downward. The number and spacing of the beam stirrup frames 181 are arranged as required, so that the two ends of the beam stirrup frame 181 are inserted into the reserved holes of the upper reinforcing steel 13 respectively. Additional beam surface steel bars 18 are set on the upper and / or lower ends of the beam stirrup frame 181 to form a steel reinforcement skeleton.

[0047] In this embodiment, the additional reinforcing bars 18 on the beam surface are located at the lower part of the beam stirrup frame 181, and are covered and tied by the beam stirrup frame 181 to form a reinforcing bar skeleton.

[0048] In this embodiment, an inner chord tie bar 163 is provided inside the upper chord rib 162, and the inner chord tie bar 163 is inserted inside the upper chord rib 162. The waist tie bar 17 is connected to the inner chord supports 163 on both sides. Since the upper chord rib 162 is spiral or cross-shaped, the inner chord tie bar 163 is fixed in the middle. The waist tie bar 17 can be set into a U-shaped structure, with both ends inserted into the upper chord rib 162, and the inner chord tie bar 163 is snapped into the inner edge, making installation convenient and quick.

[0049] In one embodiment, the heights of the two web plates 12 are different, forming a variable thickness precast beam to meet the installation requirements of floor slab structures with different thicknesses (or elevations) on both sides of the beam, such as the different elevation structures between the sunken balcony and the floor slab.

[0050] In this embodiment, the production of precast steel-concrete composite beams is as follows:

[0051] 1) The side web 12 is produced according to the requirements of length, height and thickness. UHPC ultra-high performance concrete slabs of corresponding size are produced, and the waist truss 16 is pre-embedded during production. When used, it can be cut arbitrarily or spliced ​​with fiber concrete to the required length. The two side webs 12 can be cut into different heights as needed to meet the installation of floor slab structures with different thicknesses (or elevations) on both sides, such as the different elevation structures between the sunken balcony and the floor slab.

[0052] 2) Reinforcing steel is installed at the upper and lower ends of the side web plate 12. The reinforcing steel covers at least the upper and lower end faces and one side of the side web plate 12. The upper end face of the upper reinforcing steel 13 extends to the middle and has a reserved hole.

[0053] 3) The bottom steel plate is produced in 11mm size and cut to length as needed and / or welded together.

[0054] 4) Welding of connecting beam steel plate 15: Weld connecting beam steel plate 15 onto bottom steel plate 11, so that part of connecting beam steel plate 15 extends out of bottom steel plate 11 and part extends into bottom steel plate 11.

[0055] 5) The side web plate 12 is assembled with the bottom steel plate 11. On the fixed jig, the two bottom ends of the side web plate 12 are welded to the two sides of the upper end face of the bottom steel plate 11 to form a U-shaped groove structure. The middle part forms a grouting cavity and the upper part forms a beam shell with a grouting opening. If necessary, multiple bottom beam steel bars 111 (or prestressed tendons) are laid on the bottom steel plate 11.

[0056] 6) Weld multiple top connecting steel sections 19 to the upper part of the two side webs 12 to improve the torsional resistance of the beam shell during the construction stage;

[0057] 7) The beam stirrup frame 181 is located on the upper part of the beam shell. The number and spacing of the beam stirrup frame 181 are arranged according to the requirements. The beam stirrup frame 181 is U-shaped with its opening facing downwards, so that both ends of the beam stirrup frame 181 are inserted into the reserved holes of the upper reinforcing steel 13 respectively. Additional beam surface reinforcement is set on the upper and / or lower ends of the beam stirrup frame 181 to form a steel reinforcement skeleton.

[0058] Additional reinforcement 18 on the beam surface is located below the beam stirrup frame 181 and is covered and tied by the beam stirrup frame 181 to form a reinforcement skeleton;

[0059] 8) Use waist tie 17 to connect the pre-embedded waist truss 16 of the web plates 12 on both sides to provide supporting tension; specifically, insert the inner chord tie bar 163 into the upper chord 162, and then insert the waist tie bar 17 into the inner chord tie bar 163 on both sides, and then tie / weld to fix it.

[0060] In this embodiment, the application of precast steel-concrete composite beams is as follows:

[0061] 1) Connect the connecting beam steel plate 15 of the precast steel-concrete composite beam to the connecting column steel plate of the assembled concrete column / precast concrete node column, wherein the concrete column / precast concrete node column has a suitable pre-embedded connecting column steel plate.

[0062] 2) Precast floor slabs (composite slabs, steel truss slabs, or profiled sheets, etc.) are installed on precast steel-concrete composite beams. Concrete precast node columns, concrete in the grooves of precast steel-concrete composite beams, and floor slab concrete are poured simultaneously to form an integral structure.

[0063] Compared with the original technology, the advantages of this utility model are:

[0064] 1. No on-site formwork or scaffolding is required, significantly reducing the amount of beam reinforcement binding;

[0065] 2. Precast steel-concrete composite beams are precast U-shaped channel components, which are lightweight, easy to transport and install, and low in cost;

[0066] 3. Minimal or no temporary support is required during installation, saving on temporary costs and shortening the construction period;

[0067] 4. Factory manufacturing, fast speed, high efficiency, and high precision; on-site mechanical installation.

[0068] 5. Less on-site work, higher construction efficiency;

[0069] 6. The beams and slabs are integrally cast with good overall shape;

[0070] 7. Low cost.

[0071] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A precast steel-concrete composite beam, characterized in that, include: The precast trough-shaped beam shell is a beam shell consisting of a bottom plate, two side webs and multiple top connecting steel sections forming a grouting cavity in the middle and a grouting opening at the top. The upper reinforcing steel is provided on the upper surface of the side web plate, covering at least the upper surface and outer surface of the side web plate, and the upper end of the upper reinforcing steel extends to the center, with multiple pre-reserved holes evenly provided on the extension. The lower reinforcing steel is provided on the lower end face of the side web plate, and at least covers the lower end face and inner side face of the side web plate. The connecting beam steel plate is set on the bottom steel plate, connected to the bottom steel plate at the bottom, perpendicular to the bottom steel plate, and has part of it extending out of the bottom steel plate and part of it extending into the bottom steel plate, for connecting with external beams and columns; At least one connecting component is provided between the side webs, and the connecting component is connected to the middle of the two side webs to bear the tensile force generated by the pouring of concrete on the two side webs.

2. A precast steel-concrete composite beam according to claim 1, characterized in that: The connecting components include a waist truss and at least one waist tie bar respectively disposed in the side web plate. The waist truss includes a lower chord bar and an upper chord bar. The lower chord bar is disposed along the length direction of the side web plate and is fixedly connected to the inner side surface of the side web plate. The upper chord bar protrudes out of the side web plate. The lower chord bar and the upper chord bar are connected to each other or are an integral structure on both sides. The waist tie bar is connected to the upper chord bars on both sides.

3. A precast steel-concrete composite beam according to claim 2, characterized in that: The lower chord is a linear structure embedded in the side web; the upper chord is a linear structure continuously welded to the lower chord by regular wavy steel bars.

4. The precast steel-concrete composite beam according to claim 2, characterized in that: The side web is made of UHPC ultra-high performance concrete; the lower chord reinforcement is embedded in the side web.

5. A precast steel-concrete composite beam according to claim 1, characterized in that: The upper part of the side web is provided with a beam stirrup frame, which has an open U-shaped structure. Both ends of the beam stirrup frame are inserted into the reserved holes of the two side reinforcing steels. Additional beam surface reinforcement is provided at the upper and / or lower ends of the beam stirrup frame to form a reinforcement skeleton.

6. A precast steel-concrete composite beam according to claim 1, characterized in that: The upper and lower reinforcing steels are angle steel structures.

7. A precast steel-concrete composite beam according to claim 2, characterized in that: The upper chord is provided with an inner chord tie bar, which is inserted into the upper chord. The waist tie bar is hooked to the inner chord tie bars on both sides.

8. A precast beam with variable slab thickness, characterized in that: The precast steel-concrete composite beam, as described in any one of claims 1-7, has webs of different heights on both sides, which facilitates installation on floor slabs of different thicknesses on both sides of the beam.

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