Hollow slab beam with embedded bolt connector and construction method thereof

Abstract

The present invention discloses a hollow slab beam with embedded bolt connectors and a construction method thereof, belonging to the technical field of hollow slab beam construction. The top and bottom ends of the side end faces between the hollow slabs are respectively fixedly connected by a plurality of bolts that are matched in pairs and embedded in the hollow slabs at intervals along the longitudinal direction of the hollow slabs. The bolt connector includes a transverse steel bar and a bolt connection end. The transverse steel bar is transversely embedded in the hollow slab, and the two ends are respectively fixedly connected with a bolt connection end for passing and fixing high-strength bolts. The bolt connection end is arranged in the open grooves at the top and bottom ends of the upper end face of the hollow slab and is flush with the side end face of the hollow slab. The present invention can replace the traditional cast-in-place hinged joint structure, enhance the transverse connection stability of the hollow slab beam, simplify the hollow slab construction process, improve the construction quality of the hollow slab, have good bending and shear resistance, and facilitate the rapid replacement of the slab beam in the later stage.

Description

Technical Field

[0001] The invention belongs to the technical field of hollow slab beam construction, and particularly relates to a hollow slab beam with embedded bolt connectors and a construction method thereof. Background Art

[0002] Hollow slab beams are widely used in small and medium-span highway bridges due to their high degree of assembly, good economy, and good appearance. Traditional hollow slab beams are connected by a hinged joint structure in the transverse direction. Hinge steel bars are generally set in the hinged joint and concrete materials are poured. The hinged joint space is small, which makes it difficult to construct the hinged steel bars. At the same time, the hinged steel bars affect the vibration of the concrete, which can easily lead to construction quality problems. Traditional hollow slab beams often suffer from hinged joint diseases during the operation period, which seriously affects their normal service. The hinged joint structure is a concealed structure, and early defects are difficult to detect and qualitatively test. At the same time, most repairs and reinforcements require the removal of the bridge deck pavement, and the construction is very cumbersome. When the hollow slab beam is replaced in the later stage, the hinged joint concrete needs to be chiseled out, which is complicated to construct and causes certain damage to the slab body. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a hollow slab beam with embedded bolt connectors and a construction method thereof, which can replace the traditional cast-in-place hinged joint structure, enhance the lateral connection stability of the hollow slab beam, have good bending and shear resistance, and are convenient for construction, installation, and later replacement and maintenance.

[0004] To achieve the above-mentioned purpose, the present invention is implemented by adopting the following technical solutions.

[0005] In a first aspect, the present invention provides a hollow slab beam with embedded bolt connectors, comprising at least two adjacent hollow slabs and a concrete layer cast on the top surface of the hollow slabs.

[0006] The top and bottom ends of the side end surfaces between the hollow plates are fixedly connected by a plurality of bolt connectors that are matched in pairs and pre-buried in the hollow plates at intervals along the longitudinal extension direction of the hollow plates;

[0007] The bolt connector includes a transverse steel bar and a bolt connection end. The transverse steel bar is pre-embedded transversely in the hollow slab, and each end of the transverse steel bar is fixedly connected to a bolt connection end for passing and fixing high-strength bolts. The bolt connection ends are arranged in the open grooves at the top and bottom ends of the upper end surface of the hollow slab and are flush with the side end surface of the hollow slab.

[0008] Furthermore, the bolt connection end includes an L-shaped connecting steel plate and a chamfered rectangular seat. The back side of the L-shaped connecting steel plate is fixedly welded to the transverse steel bar and is transversely fixedly connected to an L-shaped right-angled side surface at the bottom of the open groove. The inner side surface of the L-shaped connecting steel plate is fixedly welded to the right-angled surface of the chamfered rectangular seat opposite to the chamfer. The chamfered rectangular seat is provided with a transverse bolt hole for passing high-strength bolts and the outer side surface is flush with the side end surface of the hollow plate.

[0009] Furthermore, the L-shaped connecting steel plate, the chamfered rectangular seat and the open groove together form an operating cavity for accommodating the insertion of high-strength bolts, and a V-shaped bevel connected to the operating cavity is formed between the chamfer of the chamfered rectangular seat and the side wall of the open groove, and the matching V-shaped bevels on adjacent hollow slabs are aligned and connected, so that a number of concrete embedded connecting blocks that transversely connect the top surfaces of adjacent hollow slabs are formed on the bottom surface of the concrete layer, and the concrete embedded connecting blocks are densely filled in the paired matching and connected operating cavities and V-shaped bevels.

[0010] Furthermore, the concrete embedded connection block includes embedded parts at both ends and a middle connection part, the embedded parts are densely filled in the corresponding operating cavity, and have a side inner cavity wrapped with high-strength bolts; the two ends of the connection part are respectively integrally formed with fixed connection embedded parts, and the connection part is a triangular column shape with the same cross-section as the V-shaped bevel.

[0011] Furthermore, the paired matching chamfered rectangular seats at the bottom end of the hollow plate are welded together.

[0012] Furthermore, in the longitudinal direction of the hollow plate, the chamfered cuts on adjacent chamfered rectangular seats are in opposite directions.

[0013] Furthermore, the bolt connectors are arranged at even intervals or at irregular intervals according to the design requirements of the hollow slab beam.

[0014] Furthermore, at least two transverse steel bars are configured on the bolt connector, and the transverse steel bars are evenly distributed and connected to the L-shaped back side surface of the L-shaped connecting steel plate.

[0015] Furthermore, the L-shaped connecting steel plate and the chamfered rectangular seat are welded or integrally formed by die-casting.

[0016] In a second aspect, the present invention provides a method for constructing a hollow slab beam with embedded bolt connectors as described in the first aspect, comprising the following steps:

[0017] Prepare a hollow slab with a plurality of bolt connectors embedded in the longitudinal direction, wherein the L-shaped connecting steel plates at both ends of the bolt connectors are fixedly connected to the chamfered rectangular seats via transverse steel bars and are respectively placed in the open grooves at the top and bottom ends of the hollow slab, and the chamfered cutouts on adjacent chamfered rectangular seats are arranged in opposite directions;

[0018] Hoist and position adjacent hollow slabs to align the chamfered rectangular seats of the paired bolt connectors, and ensure that the transverse bolt holes and V-shaped bevels are connected and aligned;

[0019] In the order of "middle plate to side plate, mid-span to plate end", high-strength bolts are placed in one operating cavity of the matched bolt connectors and connected transverse bolt holes are drilled through them. In the other operating cavity, nuts are initially tightened and anchored. Then, in the same order, nuts are finally tightened to the preset bolt preload.

[0020] Welding is performed between the butt-jointed chamfered rectangular seats on the bottom surface of the spliced ​​and installed hollow slabs, and concrete mortar is poured on the top surface to form a concrete layer. The concrete mortar is densely filled in the paired matching and connected operating cavities and V-shaped bevels to form a number of concrete embedded connection blocks that transversely connect the top surfaces of adjacent hollow slabs, and a stable buckling structure is formed between the concrete embedded connection blocks formed at any two oppositely arranged chamfered cuts to enhance the transverse connection stability of the hollow slab beam.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The hollow slab beam with embedded bolt connectors provided by the present invention and the construction method thereof adopt the method of pre-embedding a plurality of bolt connectors at intervals longitudinally in the hollow slab, bolting the side end faces of adjacent hollow slabs via the bolt connectors, and carrying out a specific structural design of the bolt connectors, and combining the configuration of L-shaped connecting steel plates, chamfered rectangular seats, operating cavities, V-shaped bevels, chamfers, high-strength bolts, etc., to replace the traditional cast-in-place hinged joint structure, enhance the lateral connection stability of the hollow slab beam, and have good bending and shear resistance. Moreover, compared with the traditional mortar cast-in-place hinged joint structure, the connection performance and strength of the high-strength bolt connection structure of the present invention are intuitively controllable, avoiding quality problems such as hollowing and looseness in the hinged joint connection, and also avoiding the need to remove concrete in the entire hinged joint structure when replacing the hollow slab beam in the later stage. Disassembly and replacement are convenient and efficient.

[0023] At the same time, a plurality of concrete embedded connection blocks can be formed on the bottom surface of the top concrete layer, and a stable interlocking structure facing or separating can be formed between adjacent concrete embedded connection blocks, thereby enhancing the lateral connection stability of the hollow slab beam; the welding between the chamfered rectangular seats at the bottom end of the hollow slab helps to improve the bottom of the hollow slab's resistance to lateral tensile force and enhance the connection stability. According to the stress design requirements of the hollow slab, several bolt connectors can be arranged at even intervals or irregular intervals to achieve multiple considerations such as reasonable stress layout and material consumption, with simple construction, high efficiency and good performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional schematic diagram of a hollow slab beam with embedded bolt connectors provided by an embodiment of the present invention.

[0025] Figure 2 A front view of a hollow slab beam with embedded bolt connectors provided by an embodiment of the present invention.

[0026] Figure 3 A top view of a hollow slab beam with an embedded bolt connector provided by an embodiment of the present invention.

[0027] Figure 4 A three-dimensional schematic diagram of a bolt connector provided by an embodiment of the present invention.

[0028] Figure 5 This is a front view of a bolt connector provided by an embodiment of the present invention.

[0029] Figure 6 A side view of a bolt connector provided in an embodiment of the present invention.

[0030] Figure 7 A structural schematic diagram of a concrete embedded connecting block provided by an embodiment of the present invention.

[0031] Figure 8 A schematic diagram of a high-strength bolt structure provided by an embodiment of the present invention.

[0032] In the picture:

[0033] 1. Hollow slab; 2. Horizontal reinforcement; 3. L-shaped connecting steel plate; 4. Chamfered rectangular seat; 5. Horizontal bolt hole; 6. Chamfer; 7. V-shaped bevel; 8. Operating cavity; 10. High-strength bolt; 11. Embedded part; 12. Connecting part; 13. Side inner cavity. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Example

[0035] like Figure 1 、 Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a hollow slab beam with embedded bolt connectors, comprising at least two adjacent hollow slabs 1 and a concrete layer cast on the top surface of the hollow slabs 1. The top and bottom ends of the side end surfaces between the hollow slabs 1 are fixedly connected by a plurality of bolt connectors that are matched in pairs and embedded in the hollow slabs 1 at intervals along the longitudinal extension direction of the hollow slabs 1.

[0036] like Figure 4 、 Figure 5 、 Figure 6 and Figure 8 As shown, the bolt connector includes a transverse steel bar 2 and a bolt connection end. The transverse steel bar 2 is pre-embedded transversely in the hollow slab 1, and each end of the transverse steel bar 2 is fixedly connected with a bolt connection end for passing and fixing a high-strength bolt 10. The bolt connection end is arranged in the open grooves at the top and bottom ends of the upper end face of the hollow slab 1 and is flush with the side end face of the hollow slab 1.

[0037] The bolted connection includes an L-shaped connecting steel plate 3 and a chamfered rectangular seat 4. The back side of the L-shaped connecting steel plate 3 is fixedly welded to the transverse reinforcement 2 and transversely fixedly connected to one of the L-shaped right-angled sides at the bottom of the open slot. The inner side of the L-shaped connecting steel plate 3 is fixedly welded to the right-angled surface of the chamfered rectangular seat 4 opposite the chamfer 6. The chamfered rectangular seat 4 is provided with transverse bolt holes 5 for inserting high-strength bolts 10, and its outer side is flush with the side end face of the hollow slab 1. In this embodiment, the L-shaped connecting steel plate 3 and the chamfered rectangular seat 4 are welded or integrally formed by die-casting.

[0038] like Figure 1 and Figure 2 As shown, the L-shaped connecting steel plate 3, the chamfered rectangular seat 4 and the open groove together form an operating cavity 8 for accommodating the high-strength bolts 10, and a V-shaped bevel 7 connected to the operating cavity 8 is formed between the chamfer of the chamfered rectangular seat 4 and the side wall of the open groove, and the matching V-shaped bevels 7 on adjacent hollow slabs 1 are aligned and connected, so that a number of concrete embedded connecting blocks that transversely connect the top surfaces of adjacent hollow slabs 1 are formed on the bottom surface of the concrete layer, and the concrete embedded connecting blocks are densely filled in the paired matching and connected operating cavities 8 and V-shaped bevels 7.

[0039] like Figure 7 As shown, the concrete embedded connection block includes embedded portions 11 at both ends and a middle connection portion 12. The embedded portions 11 densely fill the corresponding operating cavity 8 and have a side inner cavity 13 that encloses the high-strength bolts 10. The connection portion 12 has an integrally formed fixed connection embedded portion 11 at each end, and the connection portion 12 is a triangular column with the same cross-section as the V-shaped bevel 7.

[0040] In this embodiment, the bolt connectors are evenly spaced or irregularly spaced according to the design requirements of the hollow slab beam. In addition, at least two transverse steel bars 2 are configured on the bolt connector, and the transverse steel bars 2 are evenly distributed and connected to the L-shaped back side of the L-shaped connecting steel plate 3.

[0041] In order to enhance the tensile strength of the bottom of the hollow slab 1 , the chamfered rectangular seats 4 at the bottom of the hollow slab 1 , which are matched and butted together in pairs, are welded together.

[0042] like Figure 2 As shown, in the longitudinal direction of the hollow slab 1, the chamfers 6 on adjacent chamfered rectangular seats 4 are cut in opposite directions. This design allows the concrete mortar to be densely filled into the paired, connected operating cavities 8 and V-shaped bevels 7 when the top surface is poured with concrete. This creates a number of concrete embedded connecting blocks that transversely connect the top surfaces of adjacent hollow slabs 1. Furthermore, a stable interlocking structure is formed between any two concrete embedded connecting blocks formed at locations where the chamfers 6 are cut in opposite directions, thereby enhancing the lateral connection stability of the hollow slab beam.

[0043] An embodiment of the present invention further provides a construction method for a hollow slab beam with embedded bolt connectors as in the first aspect, comprising the following steps:

[0044] Step 1: Prepare a hollow slab 1 with several bolt connectors embedded in the longitudinal direction, and fix the L-shaped connecting steel plates 3 and the chamfered rectangular seats 4 on both sides of the bolt connectors through transverse steel bars 2 and place them in the open grooves at the top and bottom ends of the hollow slab 1 respectively, and configure the chamfers 6 on adjacent chamfered rectangular seats 4 in opposite directions.

[0045] Step 2: Hoist and position the adjacent hollow slabs 1 so that the chamfered rectangular seats 4 of the bolt connectors that are matched and connected in pairs are aligned, and ensure that the transverse bolt holes 5 and the V-shaped bevels 7 are connected and aligned.

[0046] Step 3: Following the "mid-plate to side plate, mid-span to plate end" sequence, place high-strength bolts 10 in one operating cavity 8 of the paired bolt connectors and drill through interconnecting transverse bolt holes 5. Initially tighten the nuts in the other operating cavity 8 to secure the bolts. Finally, follow the same sequence to final tighten the nuts to the preset bolt preload. This "mid-plate to side plate, mid-span to plate end" sequence helps control error accumulation during the splicing process and strengthens mid-span constraints, enhancing the stability of the splicing process.

[0047] Step 4: Weld between the chamfered rectangular seats 4 on the bottom surface of the spliced ​​and installed hollow slabs 1, and pour concrete mortar on the top surface to form a concrete layer, and densely fill the paired matching and connected operating cavities 8 and V-shaped bevels 7 with the concrete mortar to form a number of concrete embedded connection blocks that transversely connect the top surfaces of adjacent hollow slabs 1, and form a stable buckling structure between the concrete embedded connection blocks formed at the opposite directions of any two chamfered cuts 6 to enhance the lateral connection stability of the hollow slab beam.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0049] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hollow slab beam with embedded bolt connectors, comprising at least two adjacent hollow slabs and a concrete layer poured on the top surface of the hollow slabs, characterized in that: The top and bottom ends of the side end surfaces between the hollow plates are fixedly connected by a plurality of bolt connectors that are matched in pairs and pre-buried in the hollow plates at intervals along the longitudinal direction of the hollow plates; The bolt connector includes a transverse steel bar and a bolt connection end, wherein the transverse steel bar is pre-embedded in the hollow slab transversely, and each end of the transverse steel bar is fixedly connected to a bolt connection end for passing and fixing a high-strength bolt, and the bolt connection end is arranged in the open grooves at the top and bottom ends of the upper end surface of the hollow slab and is flush with the side end surface of the hollow slab; The bolt connection end includes an L-shaped connection steel plate and a chamfered rectangular seat. The back side of the L-shaped connection steel plate is fixedly welded to the transverse steel bar and is transversely fixedly connected to an L-shaped right-angled side surface at the bottom of the open groove. The inner side of the L-shaped connection steel plate is fixedly welded to the right-angled surface of the chamfered rectangular seat opposite to the chamfer. The chamfered rectangular seat is provided with a transverse bolt hole for passing a high-strength bolt and the outer side surface is flush with the side end surface of the hollow plate. The L-shaped connecting steel plate, the chamfered rectangular seat and the open groove together form an operating cavity for accommodating the insertion of high-strength bolts. A V-shaped oblique opening connected to the operating cavity is formed between the chamfer of the chamfered rectangular seat and the side wall of the open groove, and the matching V-shaped oblique openings on adjacent hollow plates are aligned and connected, so that a plurality of concrete embedded connecting blocks that laterally connect the top surfaces of adjacent hollow plates are formed on the bottom surface of the concrete layer, and the concrete embedded connecting blocks are densely filled in the paired matching and connected operating cavities and V-shaped oblique openings. The concrete embedded connection block includes embedded parts at both ends and a middle connection part. The embedded parts are densely filled in the corresponding operating cavity, and have a side inner cavity wrapped with high-strength bolts; the two ends of the connection part are respectively integrally formed with fixed connection embedded parts, and the connection part is a triangular column shape with the same cross-section as the V-shaped bevel.

2. The hollow slab beam with embedded bolt connector according to claim 1, characterized in that: The chamfered rectangular seats at the bottom ends of the hollow plates are connected by welding and are matched with each other in pairs.

3. The hollow slab beam with embedded bolt connector according to claim 1, characterized in that: In the longitudinal direction of the hollow plate, the chamfered cuts on adjacent chamfered rectangular seats are in opposite directions.

4. The hollow slab beam with embedded bolt connector according to claim 1, characterized in that: The bolt connectors are arranged at even intervals or at irregular intervals according to the design requirements of the hollow slab beam.

5. The hollow slab beam with embedded bolt connector according to claim 1, characterized in that: At least two transverse steel bars are arranged on the bolt connector, and the transverse steel bars are evenly distributed and connected to the L-shaped back side surface of the L-shaped connecting steel plate.

6. The hollow slab beam with embedded bolt connector according to claim 1, characterized in that: The L-shaped connecting steel plate and the chamfered rectangular seat are welded or integrally formed by die-casting.

7. A construction method for a hollow slab beam with embedded bolt connectors according to any one of claims 1 to 6, characterized in that: The steps include: Prepare a hollow slab with a plurality of bolt connectors embedded in the longitudinal direction, wherein the L-shaped connecting steel plates at both ends of the bolt connectors are fixedly connected to the chamfered rectangular seats via transverse steel bars and are respectively placed in the open grooves at the top and bottom ends of the hollow slab, and the chamfered cutouts on adjacent chamfered rectangular seats are arranged in opposite directions; Hoist and position adjacent hollow slabs to align the chamfered rectangular seats of the paired bolt connectors, and ensure that the transverse bolt holes and V-shaped bevels are connected and aligned; In the order of "middle plate to side plate, mid-span to plate end", high-strength bolts are placed in one operating cavity of the matched bolt connectors and connected transverse bolt holes are drilled through them. In the other operating cavity, nuts are initially tightened to anchor and lock them. Then, in the same order, nuts are finally tightened to the preset bolt preload. Welding is performed between the butt-jointed chamfered rectangular seats on the bottom surface of the spliced ​​and installed hollow slabs, and concrete mortar is poured on the top surface to form a concrete layer. The concrete mortar is densely filled in the paired matching and connected operating cavities and V-shaped bevels to form a number of concrete embedded connection blocks that transversely connect the top surfaces of adjacent hollow slabs, and a stable buckling structure is formed between the concrete embedded connection blocks formed at any two oppositely arranged chamfered cuts to enhance the transverse connection stability of the hollow slab beam.

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