Concrete maintenance and reinforcement structure for bridge fire damage area

Abstract

The utility model provides a bridge fire damage area concrete maintenance reinforcing structure which comprises a beam body, the beam body comprises a damage area, a plurality of mortar layers are sprayed on the damage area, at least one reinforcing plate is arranged outside the mortar layers in the length direction of the beam body, and a plurality of reinforcing pressing strips are arranged on the reinforcing plate at intervals. The reinforcing plate and the reinforcing pressing strip are installed on the mortar layer and the beam body through a plurality of anchoring parts. By spraying a plurality of mortar layers on the damaged area of the bridge body, the damaged area is effectively filled, the external reinforcing plates and reinforcing pressing strips are fixed by using anchoring parts in a matched mode, the stability and strength of the structure are further enhanced, the function of maintaining and reinforcing the damaged area of the bridge is achieved, the structure is simple, the repairing efficiency is high, and the problem that in the prior art, the construction period is long is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge reinforcement, in particular to a concrete repair and reinforcement structure for a fire damaged area of ​​a bridge. Background Art

[0002] Concrete bridges account for over 90% of China's total construction, and fires are a frequent occurrence. When a concrete bridge is damaged, the concrete in the damaged area is subjected to high temperatures and carbonization, which reduces the resistance of the damaged section, reducing the load-bearing capacity and durability of the entire bridge, and posing a safety hazard to vehicles. Because road closures have a significant social impact and can cause travel difficulties, it is imperative to restore traffic on the bridge as quickly as possible while ensuring safety. This requires repairing and reinforcing components in the damaged area within a tight repair and reinforcement schedule to restore the bridge to its original condition.

[0003] Chinese patent CN109468965B discloses a device for reinforcing concrete bridges damaged by fire. A hinged joint is provided between the longitudinal end faces of two adjacent beams, and a hinged joint hole is provided on the hinged joint. A first reinforcement layer is provided at the lower portion of the undamaged side beams and undamaged center beams, and a second reinforcement layer is provided at the lower portion of the fire-damaged beams. An upper connecting member is provided on the top upper surface of the fire-damaged beams, undamaged side beams, and undamaged center beams, and the upper connecting member is arranged transversely, and the upper connecting member is provided with a connecting member hole. The lower reinforcing member is provided on the bottom lower surface of the fire-damaged beams, undamaged side beams, and undamaged center beams, and the lower reinforcing member is arranged transversely, and the lower reinforcing member is provided with a reinforcing member hole. The connecting rod passes through the connecting member hole, the hinged joint hole, and the reinforcing member hole. A method for reinforcing concrete bridges damaged by fire is also provided. This invention is applicable to bridges that require reinforcement after fire damage.

[0004] However, this technical solution is only suitable for situations where the fire damage is relatively large, and it is necessary to remove the bridge deck pavement to strengthen the bridge as a whole. The construction work is large and the construction period is long. It is not suitable for repairing concrete bridges with relatively small fire damage. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of the existing technology and provide a concrete repair and reinforcement structure for the fire-damaged area of ​​the bridge. By spraying several mortar layers in the damaged area of ​​the beam body, the damaged area is effectively filled. The external reinforcement plates and reinforcement strips are fixed with anchors to further enhance the stability and strength of the structure, thereby realizing the function of repairing and reinforcing the damaged area of ​​the bridge. The structure is simple and the repair efficiency is high, which solves the problem of long construction period in the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A concrete repair and reinforcement structure for a fire-damaged area of ​​a bridge comprises a beam body, the beam body comprising a damaged area, the damaged area being sprayed with a plurality of mortar layers, at least one reinforcement plate being arranged outside the mortar layers along the length direction of the beam body, the reinforcement plate being provided with a plurality of reinforcement strips at intervals; the reinforcement plates and reinforcement strips being mounted on the mortar layers and the beam body via a plurality of anchors.

[0008] As a preference, the thickness of each mortar layer is 4-10 mm.

[0009] As a preferred embodiment, the mortar layer is evenly applied in multiple times, and the next layer is applied after the previous layer hardens.

[0010] As a preference, the outermost mortar layer is polished to be flush with the surface of the beam body, and a glue injection layer is provided between the mortar layer and the reinforcement plate.

[0011] As a preference, the reinforcing strips are installed on the outside of all reinforcing plates along the width direction of the reinforcing plates, and the reinforcing strips are connected to the reinforcing plates through at least one anchor; a repair adhesive layer is provided between adjacent reinforcing plates corresponding to the reinforcing strip installation positions.

[0012] As a preference, the reinforcement plates are 200-300 mm wide and 6-10 mm thick, and the distance between adjacent reinforcement plates is 5-15 cm.

[0013] As a preferred embodiment, the reinforcing strips are 120-180 mm wide and 6-10 mm thick, and the spacing between adjacent reinforcing strips is not less than 10 cm.

[0014] As a preference, the reinforcement plates and reinforcement strips are made of steel, and the exposed parts are provided with anti-corrosion coating.

[0015] As a preference, the anchoring depth of the anchors is 10-20 cm, and the spacing between the anchors on the reinforcement plate is 25-35 cm.

[0016] As a preference, the anchoring piece is a chemical anchor.

[0017] The beneficial effects of the present invention are:

[0018] (1) The utility model effectively fills the damaged area by applying multiple layers of mortar, and uses anchors to fix the external reinforcement plates and reinforcement strips, further enhancing the stability and strength of the structure, restoring the integrity and bearing capacity of the beam, and ensuring that the bridge can be used safely after repair. It also has a simple structure and high repair efficiency.

[0019] (2) The utility model evenly applies the mortar layer in multiple times and controls the thickness of the mortar layer according to the repair position. The next layer is constructed after the previous layer hardens. This sophisticated construction method ensures the uniformity and strength of the mortar layer and avoids the risk of cracking and falling off.

[0020] (3) The present invention combines the use of reinforcement plates and reinforcement strips, which are firmly installed on the mortar layer and the beam body with anchors to form a tight overall structure. In addition, an injection layer and a repairing layer are provided to bond the reinforcement plates and reinforcement strips, further improving the strength and durability of the overall structure.

[0021] (4) The utility model effectively prevents the performance of steel from being degraded due to corrosion by providing anti-corrosion coating on the exposed parts of the reinforcement plate and the reinforcement strip, thereby extending the service life of the reinforcement structure.

[0022] In summary, the utility model has the advantages of stability, safety, high strength, good durability, etc., and has a simple structure, high repair efficiency, and reduces the impact on travel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the side reinforcement structure of the bridge according to the utility model;

[0024] Figure 2 This is a schematic diagram of the bridge section reinforcement structure of the utility model;

[0025] Figure 3 For this utility model Figure 2 A partial enlarged schematic diagram of point I in the middle;

[0026] Figure 4 This is a schematic diagram of the bridge bottom surface reinforcement structure of the utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0029] Example 1

[0030] like Figure 1-4 As shown, this embodiment provides a concrete repair and reinforcement structure for a fire-damaged area of ​​a bridge, comprising a beam 1, wherein the beam 1 includes a damaged area 11, wherein the damaged area 11 is sprayed with a plurality of mortar layers 2, and at least one reinforcement plate 3 is provided outside the mortar layer 2 along the length direction of the beam 1, and a plurality of reinforcement strips 4 are provided on the reinforcement plate 3 at intervals; the reinforcement plates 3 and reinforcement strips 4 are mounted on the mortar layer 2 and the beam 1 via a plurality of anchors 5. It should be noted that the beam 1 of this embodiment takes the cap beam as an example, and the repair and reinforcement structure of the remaining fire-damaged areas is the same as the reinforcement structure of the cap beam.

[0031] By applying multiple layers of mortar 2, the damaged area 11 is effectively filled. The use of anchors 5 to fix the external reinforcement plates 3 and reinforcement strips 4 further enhances the stability and strength of the structure, restores the integrity and bearing capacity of the beam 1, and ensures that the bridge can be used safely after repair. The structure is simple and the repair efficiency is high.

[0032] like Figure 2 、 3 As shown, each mortar layer 2 is 4-10 mm thick and is made of polymer mortar. The mortar layer 2 is evenly applied in multiple layers, and the next layer is applied after the previous layer hardens. It should be noted that in actual repair work, the mortar sprayed in the damaged area 11 on the side is required to be no thicker than 10 mm per layer, and the mortar applied in the damaged area 11 on the bottom is required to be no thicker than 6 mm per layer. In both cases, the next layer of mortar can only be applied after the previous mortar layer 2 has initially hardened.

[0033] The mortar layer 2 is evenly applied in multiple times and the thickness of the mortar layer 2 is controlled according to the repair position. The next layer is constructed after the previous layer hardens. This sophisticated construction method ensures the uniformity and strength of the mortar layer 2 and avoids the risk of cracking and falling off.

[0034] like Figure 2 、 3 As shown, the outermost mortar layer 2 is polished until it is flush with the surface of the beam body 1, and a glue injection layer 6 is provided between the mortar layer 2 and the reinforcing plate 3. The reinforcing bead 4 is installed on the outside of all reinforcing plates 3 along the width direction of the reinforcing plate 3, and the reinforcing bead 4 is connected to the reinforcing plate 3 by at least one anchor 5; a repair glue layer 7 is provided between adjacent reinforcing plates 3 corresponding to the installation position of the reinforcing bead 4.

[0035] By combining the reinforcement plate 3 with the reinforcement strip 4 and cooperating with the anchor 5 to be firmly installed on the mortar layer 2 and the beam body 1, a tight overall structure is formed. An injection glue layer 6 and a repair glue layer 7 are also provided to bond the reinforcement plate 3 and the reinforcement strip 4, further improving the strength and durability of the overall structure.

[0036] In this embodiment, the reinforcement plate 3 is 200-300 mm wide and 6-10 mm thick, with adjacent reinforcement plates 3 spaced 50-150 mm apart. The reinforcement strips 4 are 120-180 mm wide and 6-10 mm thick, with adjacent reinforcement strips 4 spaced no less than 100 mm apart. The anchors 5 are M12 chemical anchors with an anchoring depth of 10-20 cm, and the spacing between anchors 5 on the reinforcement plate 3 is 25-35 cm. Adjustments can be made within limits when encountering the main reinforcement of the beam body 1 or at the intersection of the reinforcement plate 3 and the reinforcement strip 4, avoiding the main reinforcement of the beam body 1.

[0037] Furthermore, the reinforcement plate 3 and the reinforcement strip 4 are made of steel, and the exposed parts are provided with anti-corrosion coating, which effectively prevents the performance of the steel from being degraded due to corrosion and prolongs the service life of the reinforcement structure.

[0038] Working steps

[0039] Step 1: Workers use steel chisels or other equipment such as cutters and crushers to remove the loose concrete layer in the burned area until the fresh, solid layer of the concrete structure is exposed. They then use compressed air to blow away the dust on the surface, forming a damaged area 11. While chiseling, they must protect the main reinforcement in the cap beam to prevent it from being damaged by impact from machinery or tools.

[0040] Step 2: After the chiseling is completed, the exposed steel bars are rust-removed. If the main steel is damaged, it can be cut off and replaced by steel bars of the same diameter by welding;

[0041] Step 3: After the treatment is completed, the polymer mortar layer 2 is sprayed layer by layer on the damaged area 11 according to the thickness requirements of different construction parts. This process requires waiting for the previous layer of mortar 2 to harden initially before applying the next layer;

[0042] Step 4: After spraying, wait for the mortar layer 2 to reach a strength of 30 MPa before performing preparations for installing the reinforcement plate 3 and reinforcement strip 4. First, treat the concrete interface of the mortar layer 2, grind the cross section flat, and drill holes at the corresponding positions of the beam body 1, reinforcement plate 3, and reinforcement strip 4;

[0043] Step 5. After the preparation work is completed, pressure injection is used to form an injection layer 6 on the inner side of the reinforcement plate 3. Concrete repair glue is used to level the gap between adjacent reinforcement plates 3 corresponding to the installation position of the reinforcement strip 4 until it is flush with the outer surface of the reinforcement plate 3 to form a repair glue layer 7. At the same time, anchors 5 are installed in the pre-drilled holes to fix the reinforcement plate 3 and the reinforcement strip 4.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A concrete repair and reinforcement structure for a fire-damaged area of ​​a bridge, comprising a beam body, the beam body including a damaged area, characterized in that: The damaged area is sprayed with several mortar layers, and at least one reinforcement plate is arranged outside the mortar layer along the length direction of the beam body, and several reinforcement strips are arranged at intervals on the reinforcement plate; the reinforcement plate and reinforcement strips are installed on the mortar layer and the beam body through several anchors.

2. The concrete repair and reinforcement structure for fire damaged areas of a bridge according to claim 1 is characterized in that: The thickness of each mortar layer is 4-10 mm.

3. The concrete repair and reinforcement structure for fire damaged areas of a bridge according to claim 1 is characterized in that: The mortar layer is evenly applied in multiple times, and the next layer is applied after the previous layer hardens.

4. The concrete repair and reinforcement structure for fire damaged areas of a bridge according to claim 1 is characterized in that: The mortar layer located on the outermost side is polished until it is flush with the surface of the beam body, and a glue injection layer is provided between the mortar layer and the reinforcement plate.

5. The concrete repair and reinforcement structure for fire damaged areas of a bridge according to claim 1 is characterized in that: The reinforcing strips are installed on the outside of all reinforcing plates along the width direction of the reinforcing plates, and the reinforcing strips are connected to the reinforcing plates through at least one anchor; a repair adhesive layer is provided between adjacent reinforcing plates corresponding to the installation positions of the reinforcing strips.

6. The concrete repair and reinforcement structure for fire damaged areas of a bridge according to claim 1 is characterized in that: The reinforcement plate is 200-300 mm wide and 6-10 mm thick, and the distance between adjacent reinforcement plates is 5-15 cm.

7. The concrete repair and reinforcement structure for fire damaged areas of a bridge according to claim 1 is characterized in that: The reinforcing strips are 120-180 mm wide and 6-10 mm thick, and the spacing between adjacent reinforcing strips is not less than 10 cm.

8. The concrete repair and reinforcement structure for fire damaged areas of a bridge according to claim 1 is characterized in that: The reinforcement plates and reinforcement strips are made of steel, and the exposed parts are provided with anti-corrosion coating.

9. The concrete repair and reinforcement structure for fire damaged areas of a bridge according to claim 1, characterized in that: The anchoring depth of the anchoring pieces is 10-20 cm, and the spacing between the anchoring pieces on the reinforcement plate is 25-35 cm.

10. The concrete repair and reinforcement structure for fire damaged areas of a bridge according to claim 1, characterized in that: The anchoring piece is a chemical anchor bolt.

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