Hollow slab bridge reinforcing reconstruction method

Abstract

A hollow slab bridge reinforcing reconstruction method relates to the field of bridge construction. The hollow slab bridge reinforcing reconstruction method comprises the following steps: connecting a plurality of first type steels at the bottom of the hollow slab bridge; arranging a plurality of bellows between every two adjacent hollow slabs constituting the hollow slab bridge; pouring a UHPC concrete layer above the hollow slab bridge and between the hollow slabs, so that the UHPC concrete layer wraps the bellows and connects with the hollow slab bridge into a whole; respectively passing prestressed steel through the bellows and penetrating the first type steels, installing prestressed fixed end anchorage and prestressed tension end anchorage at both ends of the prestressed steel for tensioning, and fixing the prestressed tension end anchorage. The hollow slab bridge reinforcing reconstruction method uses the prestressed steel to tighten the UHPC concrete layer, the hollow slab bridge and the first type steel to form a stable and reliable whole structure, which maximizes the utilization of the remaining bearing capacity of the hollow slab while fully utilizing the performance of the reinforcing structure.

Description

Technical Field

[0001] This application relates to the field of bridge construction, and more specifically, to a method for strengthening and renovating hollow slab bridges. Background Technology

[0002] Precast hollow slab bridges are widely used in bridge construction due to their advantages such as fast construction period, low cost, controllable quality, and ease of standardization. However, with the increase in design loads in new bridge construction standards, the generally small cross-section of hollow slabs makes it difficult to meet the load requirements, resulting in less application of hollow slabs in new bridges. Nevertheless, there are still many existing hollow slab bridges nationwide, and due to vehicle overloading or improved road standards, many of these existing bridges require reinforcement and renovation to meet new usage demands.

[0003] Most existing methods for reinforcing and renovating hollow slabs involve adding a reinforced concrete reinforcement layer to the outside of the hollow slab beam. However, the added reinforced concrete reinforcement layer cannot form a more stable connection structure with the hollow slab itself, and the remaining load-bearing capacity of the hollow slab is not fully utilized. Summary of the Invention

[0004] The purpose of this application is to provide a method for strengthening and renovating hollow slab bridges. This method uses prestressed steel bars to tighten the UHPC concrete layer, the hollow slab bridge, and the first type of steel to form a stable and reliable overall structure. While making full use of the performance of the strengthening structure, it maximizes the utilization of the remaining load-bearing capacity of the hollow slab, so that the hollow slab bridge can achieve the best strengthening effect.

[0005] This application is implemented as follows:

[0006] This application provides a method for strengthening and renovating hollow slab bridges, including the following steps:

[0007] Multiple first-section steel sections are connected at the bottom of the hollow slab bridge;

[0008] Multiple corrugated pipes are installed between every two adjacent hollow slabs that make up the hollow slab bridge;

[0009] A UHPC concrete layer is poured on top of the hollow slab bridge and between the hollow slabs, so that the UHPC concrete layer wraps the corrugated pipe and connects with the hollow slab bridge into a whole.

[0010] After passing the prestressed steel bars through each corrugated pipe, they are passed through the first steel section. Prestressed fixed end anchorages and prestressed tensioning end anchorages are installed at both ends of the prestressed steel bars for tensioning, and the prestressed tensioning end anchorages are fixed.

[0011] In some alternative implementations, the hollow slab bridge is cleaned with a high-pressure water gun and the concrete in the joints between the hollow slabs is milled before the first steel section is connected to the bottom of the hollow slab bridge.

[0012] In some alternative implementations, after the first steel section is connected to the bottom of the hollow slab bridge, a plurality of second steel sections are provided connected to the bottom of the hollow slab bridge, each of the second steel sections being connected to a first steel section.

[0013] In some alternative implementations, the first and second steel sections are connected to the hollow slab bridge by an adhesive.

[0014] In some alternative implementations, the first steel section extends along the width of the hollow slab bridge, and the second steel section is perpendicular to the first steel section.

[0015] In some alternative implementations, before the UHPC concrete layer is poured, longitudinal steel bars and multiple transverse steel bars arranged perpendicular to and connected to the longitudinal steel bars are arranged at intervals above the hollow slab bridge, and the poured UHPC concrete layer is wrapped around the longitudinal steel bars, transverse steel bars and corrugated pipes and connected to the hollow slab bridge as a whole.

[0016] In some alternative implementations, excess prestressed steel bars are removed after the prestressed tensioning end anchor is secured.

[0017] The beneficial effects of this application are as follows: The hollow slab bridge reinforcement and renovation method provided by this application includes the following steps: connecting multiple first-section steels to the bottom of the hollow slab bridge; setting multiple corrugated pipes between every two adjacent hollow slabs that make up the hollow slab bridge; pouring a UHPC concrete layer on top of the hollow slab bridge and between each hollow slab, so that the UHPC concrete layer wraps around the corrugated pipes and connects with the hollow slab bridge to form a whole; passing prestressed steel bars through each corrugated pipe and then through the first-section steels, installing prestressed fixed end anchorages and prestressed tensioning end anchorages at both ends of the prestressed steel bars for tensioning, and fixing the prestressed tensioning end anchorages. The hollow slab bridge reinforcement and renovation method provided by this application uses prestressed steel bars to tighten the UHPC concrete layer, the hollow slab bridge, and the first-section steels to form a stable and reliable overall structure, maximizing the utilization of the remaining load-bearing capacity of the hollow slabs while fully utilizing the performance of the reinforcement structure, so that the hollow slab bridge achieves the best reinforcement effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A longitudinal section view of a hollow slab bridge obtained by the hollow slab bridge reinforcement and renovation method provided in the embodiments of this application;

[0020] Figure 2 A cross-sectional view of a hollow slab bridge modified by the hollow slab bridge reinforcement and modification method provided in this application embodiment;

[0021] Figure 3 A partial structural diagram of the prestressed fixed-end anchorage, prestressed steel bars and corrugated pipe connection in the hollow slab bridge modified by the hollow slab bridge reinforcement and renovation method provided in this application embodiment;

[0022] Figure 4 A schematic diagram of the structure of the first type of steel in the hollow slab bridge obtained by the hollow slab bridge reinforcement and renovation method provided in the embodiments of this application.

[0023] In the diagram: 100, hollow slab bridge; 110, first type of steel; 120, longitudinal reinforcement; 130, transverse reinforcement; 140, hollow slab; 150, corrugated pipe; 160, UHPC concrete layer; 170, prestressed steel reinforcement; 180, prestressed fixed end anchorage; 190, prestressed tensioning end anchorage; 200, prestressed pad; 210, second type of steel. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The features and performance of the hollow slab bridge reinforcement and renovation method of this application will be further described in detail below with reference to the embodiments.

[0032] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this application provides a method for strengthening and renovating hollow slab bridges, including the following steps:

[0033] The surface of the hollow slab bridge 100 was cleaned with a high-pressure water gun, and the concrete in the joints between the hollow slabs 140 was milled with a high-pressure water gun.

[0034] At the bottom of the hollow slab bridge 100, a first steel section 110 and a second steel section 210 are arranged at intervals and extend along its width direction and are arranged at intervals and extend along its length direction. Each second steel section 210 is welded and fixed to the first and second steel sections 210. The first steel section 110 and the second steel section 210 are connected to the hollow slab bridge 100 by adhesive.

[0035] Three corrugated pipes 150 are provided between every two adjacent hollow slabs 140 that make up the hollow slab bridge 100.

[0036] Longitudinal reinforcing bars 120 and transverse reinforcing bars 130 extending along the length of the hollow slab bridge 100 are arranged at intervals above the bridge. The intersections of the longitudinal reinforcing bars 120 and the transverse reinforcing bars 130 are tied and fixed.

[0037] A UHPC concrete layer 160 is poured above the hollow slab bridge 100 and between each hollow slab 140, and the poured UHPC concrete layer 160 wraps the longitudinal steel bars 120, the transverse steel bars 130 and the corrugated pipe 150 and connects with the hollow slab bridge 100 to form a whole.

[0038] After the UHPC concrete layer 160 has cured to the preset strength, the prestressed steel bars 170 are passed through each corrugated pipe 150 and then through the first steel section 110 at the bottom of the hollow slab bridge 100. The prestressed fixed end anchor 180 is installed at the top of the prestressed steel bar 170, and the prestressed tensioning end anchor 190 and prestressed pad 200 are installed at the bottom of the prestressed steel bar 170. The prestressed steel bar 170 is tensioned using a prestressing tensioning tool. After tensioning is completed, the prestressed tensioning end anchor 190 is fixed and the excess prestressed steel bar 170 is cut off.

[0039] The hollow slab bridge reinforcement and renovation method provided in this application embodiment involves connecting a first steel section 110 to the bottom of the hollow slab bridge 100, installing corrugated pipes 150 between adjacent hollow slabs 140 of the hollow slab bridge 100, and pouring a UHPC concrete layer 160 above the hollow slab bridge 100 and between adjacent hollow slabs 140. Then, prestressed steel bars 170 are passed through each corrugated pipe 150 and then through the first steel section 110 at the bottom of the hollow slab bridge 100. Prestressed steel bars 170 are then installed at the top and bottom of the prestressed steel bars 170. The fixed-end anchorage 180 and the prestressed tensioning-end anchorage 190 are used to tension the prestressed steel bar 170 using a prestressing tensioning tool and then fix the prestressed tensioning-end anchorage 190. In this way, the tensioned prestressed steel bar 170 is used to connect and tighten the UHPC concrete layer 160, the hollow slab bridge 100 and the first steel 110 to form a stable and reliable "sandwich" structure. This not only makes full use of the performance of the reinforced structure, but also maximizes the use of the remaining load-bearing capacity of the hollow slab 140, making the reinforcement effect of the hollow slab bridge 100 better.

[0040] The use of a high-pressure water gun to clean the surface of the hollow slab bridge 100 can prevent debris from affecting the pouring of the UHPC concrete layer 160. Milling the concrete in the hinge joints between the hollow slabs 140 with a high-pressure water gun facilitates the placement of the corrugated pipe 150 within the hinge joints between two adjacent hollow slabs 140. A first steel section 110 and a second steel section 210 perpendicularly connected to the first steel section 110 are connected to the bottom of the hollow slab bridge 100. Both the first steel section 110 and the second steel section 210 are connected to the hollow slab bridge 100 with adhesive, which effectively improves the connection strength between the first steel section 110 and the hollow slab bridge 100, ensuring the stability of the connection between the hollow slab bridge 100, the first steel section 110, and the second steel section 210.

[0041] By setting longitudinal steel bars 120 and transverse steel bars 130 that are arranged at intervals and perpendicular to each other above the hollow slab bridge 100, and by having the cast UHPC concrete layer 160 wrap the longitudinal steel bars 120, transverse steel bars 130 and corrugated pipe 150 and connect them to the hollow slab bridge 100 as a whole, the structural strength of the UHPC concrete layer 160 and the connection tightness between the UHPC concrete layer 160 and the hollow slab bridge 100 can be effectively improved.

[0042] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A method for strengthening and renovating hollow slab bridges, characterized in that, Includes the following steps: The hollow slab bridge is cleaned using a high-pressure water gun, and the concrete in the joints between the hollow slabs is milled. Multiple first steel sections are connected to the bottom of the hollow slab bridge. Multiple second steel sections are provided connected to the bottom of the hollow slab bridge, and each second steel section is connected to a first steel section. The first steel sections and the second steel sections are connected to the hollow slab bridge by an adhesive. The first steel section extends along the width direction of the hollow slab bridge, and the second steel section is perpendicular to the first steel section; Multiple corrugated pipes are provided between every two adjacent hollow slabs that make up the hollow slab bridge; Longitudinal steel bars and multiple transverse steel bars arranged perpendicularly to and connected to the longitudinal steel bars are arranged at intervals above the hollow slab bridge. A UHPC concrete layer is poured above the hollow slab bridge and between each hollow slab, so that the poured UHPC concrete layer wraps the longitudinal steel bars, the transverse steel bars and the corrugated pipe and connects with the hollow slab bridge into a whole. The prestressed steel bars are passed through each of the corrugated pipes and then through the first steel section. Prestressed fixed end anchors and prestressed tensioning end anchors are installed at both ends of the prestressed steel bars for tensioning. After fixing the prestressed tensioning end anchors, the excess prestressed steel bars are cut off.

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