Arch bridge hinged part reinforcing construction method

Abstract

This invention provides a method for reinforcing the hinge joint of an arch bridge, relating to the field of bridge repair technology. It includes the following steps: injecting a water-stopping material into the construction joint of the hinge joint in the existing arch concrete; removing water stains and loose areas from the existing arch concrete and roughening its surface; attaching a rubber waterstop to the bottom surface of the existing arch concrete; tying reinforcing bars, installing formwork, and pouring a high-strength grout with an enlarged cross-section at the bottom of the existing arch concrete; after the newly poured high-strength grout with an enlarged cross-section reaches its design strength, creating a filling groove in the construction joint of the high-strength grout with an enlarged cross-section; injecting a water-stopping material into the upper part of the filling groove and a consolidating material into the lower part of the filling groove. This method can effectively reinforce the hinge joint of the existing arch concrete, allowing the hinge joint to maintain its hinge capacity. Furthermore, it can improve the waterproofing capacity of the hinge joint and retain a certain degree of waterproofing reserve.

Description

Technical Field

[0001] This invention relates to the field of bridge repair technology, and in particular to a method for reinforcing the hinged joints of an arch bridge. Background Technology

[0002] Arch bridges are classified into hingeless arches, double-hinged arches, and triple-hinged arches according to the static system of the arch ring. As the service life of bridges extends, structural defects become increasingly prominent, especially for double-hinged and triple-hinged arches. In addition to the decline in structural bearing capacity, water leakage at the hinge joints is often present.

[0003] The applicant has discovered at least the following technical problems in the prior art: the existing construction methods cannot simultaneously solve the problems of structural reinforcement and improving the waterproofing capacity reserve of hinged joints. Summary of the Invention

[0004] The purpose of this invention is to provide a method for reinforcing the hinge joint of an arch bridge, thereby solving the technical problem in the prior art that structural reinforcement and improvement of the waterproofing capacity of the hinge joint cannot be achieved simultaneously. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for reinforcing the hinged joint of an arch bridge includes the following steps:

[0007] S1. Inject water-stopping material into the construction joint at the hinge point of the existing arch concrete;

[0008] S2. Remove water stains and loose areas from the existing arch concrete and roughen its surface;

[0009] S3. Apply rubber waterstop to the bottom surface of the existing arch concrete;

[0010] S4. Tie the reinforcing bars, install the formwork, and pour high-strength grout with an enlarged cross-section at the bottom of the existing arch concrete.

[0011] S5. After the newly poured high-strength grout with enlarged cross-section reaches the design strength, a filling groove is opened in the construction joint of the hinge part of the high-strength grout with enlarged cross-section.

[0012] S6. Inject water-stopping material into the upper part of the filling groove obtained in step S5, and inject consolidation material into the lower part of the filling groove.

[0013] Preferably, the water-stopping material in step S1 is elastic rubber asphalt.

[0014] Preferably, the surface grinding width of the existing arch concrete in step S2 is 30cm.

[0015] Preferably, the width of the rubber waterstop in step S3 is 30cm, and the length of the rubber waterstop is the same as the length of the construction joint at the hinge of the existing arch concrete.

[0016] Preferably, the thickness of the high-strength grout with increased cross-section in step S4 is 15 cm.

[0017] Preferably, the width of the filling groove in step S5 is 2 cm.

[0018] Preferably, the water-stopping material in step S6 is elastic rubber asphalt.

[0019] Preferably, the injection thickness of the elastic rubber asphalt is 5 cm.

[0020] Preferably, the consolidation material in step S6 is epoxy putty.

[0021] Preferably, the epoxy putty is injected to a thickness of 2 cm.

[0022] The beneficial effects of this invention are as follows: by adopting the construction method for reinforcing the hinge joint of an arch bridge, the hinge joint of the existing arch ring concrete can be effectively reinforced, so that the hinge joint can still maintain its hinge capacity and maintain the overall structural strength of the arch bridge. In addition, it can also improve the waterproofing capacity of the hinge joint and retain a certain degree of waterproofing reserve to avoid water seepage and leakage in the hinge joint. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural diagram of the present invention;

[0025] Figure 2 This is a structural diagram of the present invention. The accompanying drawing shows the structural state of the arch bridge when the arch structure is a three-hinged arch.

[0026] 1. Existing arch ring concrete; 11. Construction joint at the hinged joint;

[0027] 2. High-strength grout with increased cross-section; 21. Filling groove;

[0028] 3. Rubber waterstop. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0030] In the description of this invention, it should be understood that the terms "center," "side," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to 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 limiting the present invention.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Reference Figures 1 to 2 This invention discloses a method for reinforcing the hinge joint of an arch bridge, comprising the following steps:

[0033] S1. Inject water-stopping material into the construction joint at the hinge of the existing arch concrete 1;

[0034] Since the existing arch concrete 1 is located at the bottom, the water-stopping material can be injected from bottom to top into the construction joint 11 of the hinge part of the existing arch concrete 1. The inside of the construction joint 11 of the hinge part is filled along the length direction of the construction joint 11 of the hinge part. This step is a deep treatment process. In this way, the waterproofing ability of the hinge part is improved by the water-stopping material, and a certain degree of waterproofing reserve is retained.

[0035] S2. Remove water stains and loose areas from the existing arch concrete 1, and roughen its surface by grinding.

[0036] After long-term use, water stains and loose parts will appear on the bottom and two sides of the existing arch ring concrete 1. At this time, it is necessary to remove the water stains and loose parts on the existing arch ring concrete 1 and roughen its surface to facilitate the subsequent application of cement mortar. Compared with the deep treatment process in step S1, step S2 is mainly a surface treatment process.

[0037] S3. Apply rubber waterstop 3 to the bottom surface of the existing arch concrete 1;

[0038] Rubber waterstop 3 is a high-performance waterstop material with good elasticity, wear resistance, aging resistance and tear resistance. It has strong adaptability to deformation and good waterproof performance. Applying rubber waterstop 3 to the ground bottom surface can further improve the waterproof ability of the hinge.

[0039] S4. Tie the reinforcing bars, install the formwork, and pour the high-strength grout 2 with an enlarged cross-section at the bottom of the existing arch concrete 1;

[0040] The existing arch ring concrete 1 and the newly poured high-strength grout with enlarged cross-section 2 form an integral whole. The newly poured high-strength grout with enlarged cross-section 2 reinforces the existing arch ring concrete 1 and maintains the overall structural strength.

[0041] S5. After the newly poured high-strength grout 2 with enlarged cross-section reaches the design strength, a filling groove 21 is opened in the construction joint of the hinge part of the high-strength grout 2 with enlarged cross-section;

[0042] Although the newly poured high-strength grout with enlarged cross-section 2 can meet the normal use requirements within a certain number of years, in order to further extend its service life and further improve the waterproofing ability and waterproofing reserve of the newly poured high-strength grout with enlarged cross-section 2, it is still preferable to open a filling groove 21 in the construction joint of the hinge part of the high-strength grout with enlarged cross-section 2. After opening the filling groove 21, it is convenient to fill the filling groove 21 with additional materials, thereby improving the waterproofing ability of the hinge part and retaining a certain degree of waterproofing reserve.

[0043] S6. Inject water-stopping material into the upper part of the filling groove 21 obtained in step S5, and inject consolidation material into the lower part of the filling groove 21;

[0044] The water-stopping material and the consolidation material are the additional materials mentioned in step S5 above. In actual operation, the water-stopping material can be injected into the upper part of the filling groove 21 first. After the injection is completed, the consolidation material can be injected into the lower part of the filling groove 21. This setting can achieve the functions of water-stopping and consolidation at the same time. The water-stopping material and the consolidation material can improve the waterproofing ability of the hinge part of the newly poured high-strength grout 2 with enlarged cross-section, and retain a certain degree of waterproofing reserve.

[0045] By adopting the above-mentioned reinforcement construction method, the hinge joint of the existing arch ring concrete 1 can be effectively reinforced, so that the hinge joint can still maintain its hinge capacity and maintain the overall structural strength of the arch bridge. In addition, it can also improve the waterproofing capacity of the hinge joint and retain a certain degree of waterproofing reserve to avoid water seepage and leakage in the hinge joint.

[0046] It is worth noting that if the arch bridge has multiple hinged parts, the above-mentioned reinforcement construction method needs to be used to treat each hinged part separately. At the same time, in order to maintain the structural strength and stability, the size and thickness of the newly poured high-strength grout 2 with increased cross-section at multiple hinged parts should be kept consistent.

[0047] As an optional implementation, step S7 is also included: applying a cement mortar layer and a decorative surface layer to the combined structure formed by the existing arch ring concrete 1 and the newly poured high-strength grout to make the structure intact.

[0048] As an optional implementation, the water-stopping material in step S1 is elastic rubber asphalt. Elastic rubber asphalt has a good water-stopping effect. When applied to water-stopping materials, it can improve the waterproofing ability of the hinged parts and retain a certain degree of waterproofing reserve.

[0049] As an optional implementation, the surface grinding width of the existing arch concrete 1 in step S2 is 30cm. The width of 30cm is a suitable width size, which is derived from long-term practice in existing construction sites and is greater than the width of the existing construction joint at the hinge.

[0050] As an optional implementation, the width of the rubber waterstop 3 in step S3 is 30cm. The width of the rubber waterstop 3 can be consistent with the surface grinding width of the existing arch concrete 1. The length of the rubber waterstop 3 is the same as the length of the construction joint at the hinge of the existing arch concrete 1, so that the rubber waterstop 3 can be completely pasted on the ground bottom surface, further improving the waterproofing ability of the hinge.

[0051] As an optional implementation, the thickness of the high-strength grout 2 with increased cross-section in step S4 is 15cm. The high-strength grout 2 with increased cross-section is derived from long-term practice at existing construction sites, which is sufficient to meet the reinforcement requirements. At the same time, it can save materials, reduce material costs and construction costs, and shorten the construction cycle.

[0052] As an optional implementation, the width of the filling groove 21 in step S5 is 2cm and the thickness is 7cm. The width and thickness of the filling groove 21 are derived from long-term practice at existing construction sites, which is sufficient to meet the water-stopping requirements, while saving materials, reducing material and construction costs, and shortening the construction cycle.

[0053] As an optional implementation, the water-stopping material in step S6 is elastic rubber asphalt. Elastic rubber asphalt has a good water-stopping effect. When applied to water-stopping materials, it can improve the waterproofing ability of the hinged parts and retain a certain degree of waterproofing reserve. The injection thickness of elastic rubber asphalt is 5cm.

[0054] As an optional implementation, the consolidation material in step S6 is epoxy mortar. Epoxy mortar has stable chemical properties, good corrosion and weather resistance, and the consolidated body has high adhesion, high compressive strength, and is not limited by the structural shape. It has the function of reinforcement and strengthening. Therefore, when used as a consolidation material, it can effectively strengthen the hinged parts of the existing arch concrete 1, so that the hinged parts can still maintain their hinged capacity and maintain the overall structural strength of the arch bridge. The injection thickness of epoxy mortar is 2cm. Epoxy mortar fills the remaining thickness in the filling groove 21 after the elastic rubber asphalt has been filled. The epoxy mortar and elastic rubber asphalt work together to further improve the service life and further improve the waterproofing capacity and waterproofing reserve of the newly poured high-strength grout 2 with increased cross-section.

[0055] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for reinforcing the hinged joint of an arch bridge, characterized in that, Includes the following steps: S1. Inject water-stopping material into the construction joint at the hinge point of the existing arch concrete; S2. Remove water stains and loose areas from the existing arch concrete and roughen its surface; S3. Apply rubber waterstop to the bottom surface of the existing arch concrete; S4. Tie the reinforcing bars, install the formwork, and pour high-strength grout with an enlarged cross-section at the bottom of the existing arch concrete. S5. After the newly poured high-strength grout with enlarged cross-section reaches the design strength, a filling groove is opened in the construction joint of the hinge part of the high-strength grout with enlarged cross-section. S6. Inject water-stopping material into the upper part of the filling groove obtained in step S5, and inject consolidation material into the lower part of the filling groove. The water-stopping material in step S6 is elastic rubber asphalt, and the consolidation material in step S6 is epoxy putty.

2. The method for reinforcing the hinged joint of an arch bridge according to claim 1, characterized in that... The water-stopping material in step S1 is elastic rubber asphalt.

3. The method for reinforcing the hinged joint of an arch bridge according to claim 1, characterized in that... In step S2, the surface grinding width of the existing arch concrete is 30cm.

4. The method for reinforcing the hinged joint of an arch bridge according to claim 1, characterized in that... In step S3, the width of the rubber waterstop is 30cm, and the length of the rubber waterstop is the same as the length of the construction joint at the hinge of the existing arch concrete.

5. The method for reinforcing the hinged joint of an arch bridge according to claim 1, characterized in that... The thickness of the high-strength grouting material with increased cross-section in step S4 is 15cm.

6. The method for reinforcing the hinged joint of an arch bridge according to claim 1, characterized in that... The width of the filling groove in step S5 is 2cm.

7. The method for reinforcing the hinged joint of an arch bridge according to claim 1, characterized in that... The injection thickness of the elastic rubber asphalt is 5cm.

8. The method for reinforcing the hinged joint of an arch bridge according to claim 1, characterized in that... The epoxy putty is injected to a thickness of 2cm.

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