Hollow slab bridge with enhanced transverse integrity and construction method thereof

Abstract

The present invention discloses a hollow slab bridge with enhanced transverse integrity and a construction method thereof. Hollow slabs of the same span are laterally connected to form a whole at the mid-span by a post-cast hinge joint and at both ends by respective end caps. The hollow slabs and their respective end caps are prefabricated as a single piece. The end caps of the hollow slab center plate are provided with protrusions and grooves on both transverse sides, respectively. The end caps of the hollow slab side plates are provided with protrusions or grooves on the transverse inner sides. The protrusions and grooves are provided with pre-embedded transverse reinforcement steel bars and pre-reserved holes, respectively. Grouting holes for high-pressure grouting are reserved on the protrusions. Post-cast strips are provided on the pier structure between adjacent spans to form reinforced crossbeams. The reinforced crossbeams are supported on the pier structure by supports. The end caps facing the post-cast strips are provided with pre-embedded longitudinal reinforcement steel bars. The present invention enhances transverse integrity, enables adjustment of the number of supports, enhances structural safety, and facilitates construction.

Description

Technical Field

[0001] The invention belongs to the field of bridge construction, and in particular relates to a hollow slab bridge with enhanced transverse integrity and a construction method thereof. Background Art

[0002] Most of the small and medium-span highway bridges with a span of 13 to 20 meters are hollow slab bridges. Since prefabricated hollow slab bridges use hinged joints for connection, their lateral integrity is poor, and too many supports are prone to becoming empty. Once the supports become empty, the hinged joints will be damaged, and the damaged hinged joints will cause the single slab to be stressed, resulting in structural cracks and damage, which in turn causes problems with the pavement. Summary of the Invention

[0003] The purpose of the present invention is to provide a hollow slab bridge with enhanced transverse integrity and a construction method thereof. The present invention enhances the transverse integrity, can adjust the number of supports (6), enhances structural safety, and facilitates construction.

[0004] The technical solution adopted in the present invention is:

[0005] A hollow slab bridge with enhanced transverse integrity, wherein each span comprises hollow slab side plates (1) located on both sides and a plurality of hollow slab middle plates (2) located in the middle, the hollow slabs of the same span are transversely connected into a whole through a post-cast hinge joint (3) in the middle of the span and through respective plugging plates (5) at both ends, the hollow slabs and their respective plugging plates (5) are prefabricated as a whole, the plugging plates (5) of the hollow slab middle plates (2) are respectively reserved with protrusions (8) and grooves (7) on both transverse sides, and the plugging plates (5) of the hollow slab side plates (1) are respectively reserved with protrusions (8) or grooves (7) on the transverse inner side. ), the protrusion (8) and the groove (7) are respectively provided with pre-buried transverse reinforcing steel bars (9) and reserved holes (10), the protrusion (8) is inserted into the corresponding groove (7), and the transverse reinforcing steel bars (9) are extended into the corresponding reserved holes (10), and a grouting hole (12) for high-pressure grouting is reserved on the protrusion (8); a post-cast strip (4) is provided on the pier structure between adjacent spans to form a reinforcing crossbeam, and the reinforcing crossbeam is supported on the pier structure through a support (6), and a pre-buried longitudinal reinforcing steel bar (13) is provided on the side of the plug plate (5) facing the post-cast strip (4).

[0006] Furthermore, the reinforcement beam is supported on the pier structure through 2 to 3 supports (6).

[0007] Furthermore, transverse prestressed steel strands are provided on the reinforcing beams.

[0008] The above-mentioned construction method of the hollow slab bridge with enhanced transverse integrity comprises the following steps:

[0009] S1. Determine the size of each hollow slab according to the design requirements, install the hollow slab template, ensure that the hollow slab body, plug plate (5), protrusion (8), groove (7), reserved holes (10) can be integrally formed, tie the hollow slab steel bars, embed and install transverse reinforcement steel bars (9) and longitudinal reinforcement steel bars (13), then pour the hollow slab concrete and perform maintenance;

[0010] S2. Hoisting the hollow slab, so that the hollow slab is supported on the pier structure that has been cured by temporary supports (11), and the hollow slabs are sequentially spliced ​​so that the hollow slabs of the same span are laterally connected into a whole by post-cast hinge joints (3) at the mid-span and by respective plugging plates (5) at both ends;

[0011] S3. Install the post-casting strip formwork, tie the post-casting strip steel bars, install the support (6) on the pier structure that has been cured, and then pour the post-casting strip concrete. At the same time, high-pressure grouting is performed to the grouting holes (12) to fill the gap between the transverse reinforcement bars (9) and the reserved holes (10);

[0012] S4. After the curing zone (4) reaches the required strength, the temporary support (11) is removed;

[0013] S5. Complete the construction of cast-in-place layer, pavement and ancillary facilities on the bridge deck.

[0014] Furthermore, when a transverse prestressed steel bundle is required to strengthen the crossbeam, the prestressed corrugated pipe is embedded before pouring the post-cast concrete. After pouring the post-cast concrete, the transverse prestressed steel bundle is passed through the prestressed corrugated pipe, tensioned, and then anchored.

[0015] The beneficial effects of the present invention are:

[0016] In the present invention, the setting of the plug plate (5) can, firstly, prevent the concrete from seeping out from the post-cast hinge joint (3) when the post-cast strip (4) is cast, thereby protecting the slurry from solidifying and forming. Secondly, the cooperation between the protrusion (8) and the groove (7), the transverse reinforcing steel bar (9) and the reserved hole (10) can be utilized to enhance the transverse integrity of the hollow slab. Thirdly, the grouting hole (12) can be utilized for high-pressure grouting to fill the gap between the transverse reinforcing steel bar (9) and the reserved hole (10), thereby further strengthening the transverse connection of the hollow slab at the end. Fourthly, the longitudinal reinforcing steel bar (13) can be utilized to strengthen the connection with the post-cast strip (4), thereby effectively reducing the occurrence of diseases in the later use stage. Reduce operation and maintenance costs; in the present invention, a post-cast strip (4) is set on the pier structure between adjacent spans to form a reinforcing beam. Since the reinforcing beam is an integral transverse structure, the number of supports (6) can be adjusted to make the force more reasonable. Therefore, individual supports (6) will not generate transverse negative reaction forces due to an excessive number of supports (6), thereby enhancing the structural safety; in the present invention, the hollow slabs and their respective plugging plates (5) are prefabricated as a whole, and the hollow slabs are spliced ​​and installed in sequence, which is convenient for construction; in the present invention, the plugging plate (5) of the hollow slab middle plate (2) is respectively reserved with a protrusion (8) and a groove (7) on both sides of the transverse direction, which has universality and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view at the mid-span position of a hollow slab bridge with enhanced transverse integrity according to an embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional view of a hollow slab bridge at the end plate position for enhancing the transverse integrity in an embodiment of the present invention.

[0019] Figure 3 It is a cross-sectional view of a hollow slab bridge at a post-cast zone with enhanced transverse integrity according to an embodiment of the present invention.

[0020] Figure 4 It is a plan view of adjacent span areas of a hollow slab bridge with enhanced transverse integrity according to an embodiment of the present invention.

[0021] Figure 5 1 is an elevation view of adjacent span areas of a hollow slab bridge with enhanced lateral integrity according to an embodiment of the present invention.

[0022] Figure 6 This is a plan view of the middle plate of the hollow slab in adjacent span areas in an embodiment of the present invention; for ease of observation, the transverse reinforcing steel bars and reserved holes are omitted.

[0023] Figure 7 It is a plan view of the side plate of a hollow slab on one side in adjacent span areas in an embodiment of the present invention.

[0024] Figure 8It is a plan view of the other side of the hollow slab in the adjacent span area in an embodiment of the present invention.

[0025] In the figure: 1- side plate of hollow slab; 2- middle plate of hollow slab; 3- post-cast hinge joint; 4- post-cast strip; 5- plugging plate; 6- support; 7- groove; 8- protrusion; 9- transverse reinforcement; 10- reserved hole; 11- temporary support; 12- grouting hole; 13- longitudinal reinforcement. DETAILED DESCRIPTION

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

[0027] like Figures 1 to 8 As shown, a hollow slab bridge with enhanced transverse integrity, each span includes hollow slab side plates 1 on both sides and several hollow slab middle plates 2 in the middle, the hollow slabs of the same span are connected transversely into a whole through post-cast hinge joints 3 in the middle of the span and through respective plugging plates 5 at both ends, the hollow slabs and their respective plugging plates 5 are prefabricated as a whole, the plugging plates 5 of the hollow slab middle plates 2 are respectively reserved with protrusions 8 and grooves 7 on both sides of the transverse direction, and the plugging plates 5 of the hollow slab side plates 1 are reserved with protrusions 8 on the inner side of the transverse direction Or groove 7, the protrusion 8 and the groove 7 are respectively provided with embedded transverse reinforcing steel bars 9 and reserved holes 10, the protrusion 8 is inserted into the corresponding groove 7, and the transverse reinforcing steel bars 9 are extended into the corresponding reserved holes 10, and grouting holes 12 for high-pressure grouting are reserved on the protrusion 8; a post-cast strip 4 is set on the pier structure between adjacent spans to form a reinforced beam, and the reinforced beam is supported on the pier structure through the support 6, and the head plate 5 is provided with embedded longitudinal reinforcing steel bars 13 on the side facing the post-cast strip 4.

[0028] Preferably, the reinforcement beam is supported on the pier structure through 2 to 3 supports 6 .

[0029] Preferably, transverse prestressed steel strands can be provided on the reinforcing beams as required.

[0030] The above-mentioned construction method of the hollow slab bridge with enhanced transverse integrity comprises the following steps:

[0031] S1. Determine the size of each hollow slab according to the design requirements, install the hollow slab formwork, ensure that the hollow slab body, plug plate 5, protrusion 8, groove 7, reserved hole 10 can be integrally formed, tie the hollow slab steel bars, embed and install transverse reinforcement bars 9 and longitudinal reinforcement bars 13, then pour the hollow slab concrete and perform maintenance;

[0032] S2 hoisting hollow slabs, so that the hollow slabs are supported by temporary supports 11 on the pier structure that has been cured, and then the hollow slabs are spliced ​​together so that the hollow slabs of the same span are connected to a whole by post-cast hinge joints 3 at both ends and by their respective plugging plates 5;

[0033] S3. Install the post-casting strip formwork, tie the post-casting strip steel bars, install the support 6 on the pier structure that has been cured, and then pour the post-casting strip concrete, while high-pressure grouting to the grouting holes 12, filling the gap between the transverse reinforcement bars 9 and the reserved holes 10;

[0034] S4 curing strip 4, after reaching the required strength, remove the temporary support 11;

[0035] S5. Complete the construction of cast-in-place layers, pavement, and ancillary facilities (such as guardrails, sidewalks, etc.) on the bridge deck.

[0036] When it is necessary to set up transverse prestressed steel strands for strengthening the crossbeam, prestressed corrugated pipes are embedded before pouring the post-cast concrete. After pouring the post-cast concrete, the transverse prestressed steel strands are passed through the prestressed corrugated pipes, tensioned, and then anchored.

[0037] In the present invention, the setting of the plug plate 5 can, firstly, prevent the concrete from seeping out from the post-cast hinge joint 3 when pouring the post-cast strip 4, and protect the slurry from solidifying and forming; secondly, it can utilize the cooperation between the protrusion 8 and the groove 7, the transverse reinforcing steel bar 9 and the reserved hole 10 to enhance the transverse integrity of the hollow slab; thirdly, it can utilize the grouting hole 12 for high-pressure grouting to fill the gap between the transverse reinforcing steel bar 9 and the reserved hole 10, and further strengthen the transverse connection of the hollow slab at the end; fourthly, it can utilize the longitudinal reinforcing steel bar 13 to strengthen the connection with the post-cast strip 4, which can effectively reduce the occurrence of diseases in the later use stage and reduce transportation Maintenance cost; in the present invention, a post-cast strip 4 is set on the pier structure between adjacent spans to form a reinforcing beam. Since the reinforcing beam is an integral horizontal structure, the number of supports 6 can be adjusted to make the force more reasonable. Therefore, individual supports 6 will not generate lateral negative reaction forces due to excessive number of supports 6, thereby enhancing the safety of the structure; in the present invention, the hollow slabs and their respective plugging plates 5 are prefabricated as a whole, and the hollow slabs are spliced ​​and installed in sequence, which is convenient for construction; in the present invention, the plugging plate 5 of the hollow slab middle plate 2 is respectively reserved with protrusions 8 and grooves 7 on both sides of the horizontal direction, which has versatility and reduces costs.

[0038] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A hollow slab bridge with enhanced lateral integrity, characterized by: Each span includes hollow slab side plates (1) located on both sides and a plurality of hollow slab middle plates (2) located in the middle. The hollow slabs of the same span are laterally connected into a whole through a post-cast hinge joint (3) in the middle of the span and through respective plugging plates (5) at both ends. The hollow slabs and their respective plugging plates (5) are prefabricated as a whole. The plugging plates (5) of the hollow slab middle plates (2) are respectively reserved with protrusions (8) and grooves (7) on both sides in the transverse direction. The plugging plates (5) of the hollow slab side plates (1) are respectively reserved with protrusions (8) or grooves (7) on the inner side in the transverse direction. The protrusions (8) and grooves are respectively reserved with protrusions (8) and grooves (7). (7) are respectively provided with embedded transverse reinforcing steel bars (9) and reserved holes (10), the protrusions (8) are inserted into the corresponding grooves (7), and the transverse reinforcing steel bars (9) are extended into the corresponding reserved holes (10), and grouting holes (12) for high-pressure grouting are reserved on the protrusions (8); a post-cast strip (4) is set on the pier structure between adjacent spans to form a reinforcing beam, and the reinforcing beam is supported on the pier structure by 2 to 3 supports (6), and a pre-embedded longitudinal reinforcing steel bar (13) is provided on the side of the plug plate (5) facing the post-cast strip (4).

2. The hollow slab bridge with enhanced transverse integrity according to claim 1, characterized in that: Transverse prestressed steel strands are provided on the reinforcing beams.

3. A construction method for a hollow slab bridge with enhanced transverse integrity as claimed in claim 1 or 2, characterized in that: Including steps, S1. Determine the size of each hollow slab according to the design requirements, install the hollow slab template, ensure that the hollow slab body, the plug plate (5), the protrusion (8), the groove (7), and the reserved hole (10) can be formed in one piece, tie the hollow slab steel bars, embed and install the transverse reinforcement steel bars (9) and the longitudinal reinforcement steel bars (13), and then pour the hollow slab concrete and perform maintenance; S2. Hoist the hollow slab so that it is supported on the pier structure that has been cured by means of temporary supports (11), and sequentially connect the hollow slabs so that the hollow slabs of the same span are laterally connected into a whole through the post-cast hinge joint (3) in the middle of the span and through respective plugging plates (5) at both ends; S3. Install the post-cast strip formwork, tie the post-cast strip reinforcement, install the support (6) on the pier structure that has been cured, and then pour the post-cast strip concrete. At the same time, high-pressure grouting is performed to the grouting hole (12) to fill the gap between the transverse reinforcement (9) and the reserved hole (10); S4. After the post-cast strip (4) reaches the required strength, the temporary support (11) is removed; S5. Complete the construction of cast-in-place layer, pavement and ancillary facilities on the bridge deck.

4. The method for constructing a hollow slab bridge with enhanced transverse integrity according to claim 3, wherein: When it is necessary to set up transverse prestressed steel strands for strengthening the crossbeam, prestressed corrugated pipes are embedded before pouring the post-cast concrete. After pouring the post-cast concrete, the transverse prestressed steel strands are passed through the prestressed corrugated pipes, tensioned, and then anchored.

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