Bridge large-size bearing platform

Abstract

The utility model relates to the technical field of bridges, in particular to a bridge large-size bearing platform which comprises a steel jacket box and a plurality of sets of steel casings, the steel casings are evenly arranged on the lower portion of the inner side of the steel jacket box, a plurality of layers of reinforcing meshes are erected on the inner side of the steel jacket box, and cooling pipes penetrate through the reinforcing meshes. A welding lantern ring is arranged on the steel casing, an avoiding hole matched with the welding lantern ring is formed in the reinforcing mesh, the reinforcing mesh and the welding lantern ring are welded, a flared pipe is arranged at the top of the steel casing, and the steel casing is filled with concrete. The cooling pipes are arranged between the reinforcing meshes, concrete is cooled through cooling water, the internal temperature of the concrete is effectively reduced, reliable solidification and hardening of mass concrete are ensured, meanwhile, the welding lantern rings are arranged between the steel casing and the reinforcing meshes, the welding reliability is improved, and the connection strength between the bearing platform and the pile foundation is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of bridges, in particular to a large-volume bridge cap. Background Technique

[0002] As the name implies, a large-volume bridge cap refers to a relatively large reinforced concrete platform, which is used to be arranged on the top of a pile foundation to bear and distribute the load transmitted by the pier body. The large-volume bridge cap is a key and important part of bridge engineering, and it plays an important role in connecting the upper and lower parts and transmitting the load. The size of the cap is often large to accommodate enough steel bars and concrete to ensure the stability and bearing capacity of the structure. Through the tensile performance of the steel bars and the compressive performance of the concrete, the overall stability of the structure is realized. It can bear the huge load from the upper structure and effectively transmit it to the pile foundation.

[0003] However, the construction technology of large-volume concrete pouring is difficult. If the temperature is not well controlled, it is easy to cause too high hydration heat during the hardening process of the concrete, resulting in concrete cracking and affecting the strength of the cap. At the same time, due to the large weight of the large-volume cap, sufficient connection strength is also required between the steel bars and the steel casing. In the existing technology, the steel bars are directly welded to the steel casing, and the welding points will damage the side wall of the steel casing, affecting the connection strength between the cap and the pile foundation. Content of the Utility Model

[0004] The purpose of the utility model is to solve the deficiencies existing in the prior art, and to provide a large-volume bridge cap.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A large-volume bridge cap includes a steel casing and steel casings. There are multiple groups of the steel casings, which are uniformly arranged at the lower part inside the steel casing. A steel bar mesh is erected inside the steel casing. There are multiple layers of the steel bar mesh, and cooling pipes penetrate between the steel bar meshes; welding collars are provided on the steel casings, avoiding holes adapted to the welding collars are opened on the steel bar mesh, and the steel bar mesh and the welding collars are welded. An expansion pipe is provided at the top of the steel casing, and concrete is filled in the steel casing.

[0007] Preferably, the distance between multiple layers of the steel bar mesh gradually increases from bottom to top, and a steel bar mesh is arranged on the upper side of the steel casing.

[0008] Preferably, there are multiple groups of the cooling pipes, which are uniformly arranged in the concrete. One end of each cooling pipe is connected to a water pump and a water supply pipe, and a temperature sensor and a flow sensor are arranged inside the cooling pipe.

[0009] Preferably, the welding collar is fixedly connected to the steel casing, and a strain gauge sensor is arranged on the welding collar.

[0010] Preferably, the concrete is vertically embedded with encrypted steel bars, the upper ends of the encrypted steel bars extend out of the concrete, and the lower ends of the encrypted steel bars are welded to the steel bar mesh.

[0011] Preferably, the upper half of the encrypted steel bar is connected to the pier, and the lower half of the steel casing is connected to the pile foundation.

[0012] The beneficial effects of the present utility model are as follows:

[0013] Compared with the prior art, the present utility model is provided with cooling pipes between the steel bar meshes, and the concrete is cooled by cooling water, effectively reducing the internal temperature of the concrete, ensuring the reliable solidification and hardening of the mass concrete. At the same time, welding collar rings are provided between the steel casing and the steel bar mesh, improving the welding reliability and ensuring the connection strength between the bearing platform and the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 FIG. is a three-dimensional structure diagram during the construction of a large-volume bearing platform of a bridge proposed by the present utility model;

[0015] Figure 2 FIG. is a structural diagram of a welding collar ring of a large-volume bearing platform of a bridge proposed by the present utility model;

[0016] Figure 3 FIG. is a three-dimensional structure diagram after the construction of a large-volume bearing platform of a bridge proposed by the present utility model.

[0017] In the figure: 1, steel casing; 2, steel bar mesh; 21, welding collar ring; 3, cooling pipe; 4, steel casing; 41, flared pipe; 5, concrete; 6, encrypted steel bar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The description of at least one exemplary embodiment is actually only illustrative and in no way serves as any limitation to the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Refer to Figures 1-3, a large-volume bridge cap, including a steel cofferdam 1 and a steel casing 4. The steel cofferdam 1 is filled with concrete 5. The lower part of the steel casing 4 is connected to the pile foundation. The steel cofferdam 1 is connected to the steel plate by rigid members such as angle steel, channel steel and steel pipe, thus forming a structure with reliable integrity and good waterproof performance. Generally, it is used as a water retaining facility and can also be used as a formwork for the construction of the bridge cap, reducing project costs and shortening the construction period. The bottom of the steel cofferdam 1 is supported by I-beams. There are multiple groups of steel casings 4, which are evenly arranged at the lower part inside the steel cofferdam 1. The steel casing 4 is a protective tool widely used in foundation engineering and construction fields, mainly used to protect the foundation structure, prevent collapse, guide construction, isolate pollutants and improve the bearing capacity. During the piling construction process, the steel casing 4 can prevent the soil on the outer edge of the pile foundation from collapsing, effectively isolate the external environment, reduce the direct scouring and erosion of the soil or water flow on the foundation structure, and ensure the stability and safety of the foundation;

[0020] A steel bar mesh 2 is installed inside the steel cofferdam 1. There are multiple layers of the steel bar mesh 2 to improve the overall strength of the bridge cap. The distance between the multiple layers of the steel bar mesh 2 gradually increases from bottom to top. Multiple layers of steel bar meshes 2 are also arranged on the upper side of the steel casing 4 to wrap the steel casing 4 and improve the bearing capacity;

[0021] Cooling pipes 3 penetrate between the steel bar meshes 2. There are multiple groups of cooling pipes 3, which are evenly arranged in the concrete 5. One end of the cooling pipe 3 is connected to a water pump and a water supply pipe. A temperature sensor and a flow sensor are arranged inside the cooling pipe 3. The cooling pipe 3 is a measure to reduce the temperature of the large-volume concrete to prevent the concrete from cracking due to excessive hydration heat during the hardening process of the concrete; after the concrete pouring task is completed, cold water is input into the cooling pipe 3 through the water pump and the water supply pipe, and the temperature of the concrete is reduced through the cold water circulation, thereby preventing the concrete from cracking. According to the feedback of the temperature sensor, the water pump flow is adjusted in time to ensure the cooling reliability;

[0022] Welding collars 21 are provided on the steel casing 4. The welding collars 21 improve the connection reliability between the steel bar mesh 2 and the steel casing 4. The welding collars 21 are fixedly connected to the steel casing 4. Strain gauges are arranged on the welding collars 21 to detect the stress received by the welding collars 21, measure the strain inside the large-volume bridge cap, form data, and facilitate the inspection by maintenance personnel. Avoidance holes adapted to the welding collars 21 are provided on the steel bar mesh 2. The steel bar mesh 2 and the welding collars 21 are welded. The protruding parts of the welding collars 21 can be processed with holes and grooves, which is more convenient for welding with the steel bar mesh 2 and ensures the welding reliability. An expansion pipe 41 is provided at the top of the steel casing 4 to change the force direction and prevent slippage between the steel casing 4 and the bridge cap;

[0023] It is used for pouring the main body of the bearing platform. According to the size of the bearing platform and the construction environment, it can be poured in one go or in layers. There are densified steel bars 6 vertically embedded in the concrete 5. The upper ends of some densified steel bars 6 extend out of the concrete 5. The upper half of the densified steel bars 6 is connected to the bridge pier and welded to the steel bars in the bridge pier. The lower ends of the densified steel bars 6 are welded to the steel bar mesh 2 to improve the overall connection strength.

[0024] In this embodiment, the foundation pit is excavated. Mechanical excavation is mainly adopted, supplemented by manual bottom cleaning and leveling. According to the size of the bearing platform, formwork support and operation requirements, the excavation depth and slope are determined to ensure the stability of the slope. The sundries and loose soil layers at the bottom of the foundation pit are removed to ensure the flatness of the base. Foundation treatment is carried out, such as laying cushions, grouting reinforcement, etc. The steel casing 4 is fixed. An I-beam support system is installed in the bearing platform foundation pit to ensure the stability and reliability of the support system. The steel cofferdam 1 is installed. During the installation process, the I-beam support system is used for fixation and support to avoid deformation and displacement of the steel cofferdam 1. The bottom-sealing concrete is cleaned, and the upper surface of the bottom-sealing is leveled with concrete mortar. Then the main body steel bars of the bearing platform are installed, and the binding and installation of the bearing platform steel bars are carried out according to the design requirements. The welding collar 21 is installed, the steel bar mesh 2 is welded to the welding collar 21, the cooling pipes 3 and the densified steel bars 6 are embedded. The concrete of the main body of the bearing platform is poured, generally in horizontal layers, and the thickness of each layer is controlled at about 30 cm to 50 cm. Vibration is carried out while pouring, and cooling water is pumped by a water pump to cool the concrete 5 to ensure the normal setting and hardening of the concrete 5.

[0025] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience in description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. A large-volume bridge cap, comprising a steel casing (1) and a steel casing pipe (4), characterized in that, The steel casing (4) is provided with multiple groups and is evenly arranged at the lower part inside the steel cofferdam (1). A steel bar mesh (2) is erected inside the steel cofferdam (1). The steel bar mesh (2) is provided with multiple layers, and cooling pipes (3) penetrate between the steel bar meshes (2). A welding collar (21) is provided on the steel casing (4). Avoidance holes adapted to the welding collar (21) are formed in the steel bar mesh (2). The steel bar mesh (2) is welded to the welding collar (21). A flared pipe (41) is provided at the top of the steel casing (4). Concrete (5) is filled in the steel cofferdam (1).

2. The large-volume bridge cap according to claim 1, characterized in that, The distance between the multiple layers of the steel bar mesh (2) gradually increases from bottom to top. The steel bar mesh (2) is arranged on the upper side of the steel casing (4).

3. A large-volume bridge cap according to claim 1, characterized in that, Multiple groups of the cooling pipes (3) are provided and are evenly arranged in the concrete (5). One end of the cooling pipe (3) is connected to a water pump and a water supply pipe. A temperature sensor and a flow sensor are arranged in the cooling pipe (3).

4. A large-volume bridge cap according to claim 1, characterized in that The welding collar (21) is fixedly connected to the steel casing (4), and a strain gauge sensor is provided on the welding collar (21).

5. A large-volume bridge pier cap according to claim 1, characterized in that, Reinforcing bars (6) are vertically embedded in the concrete (5). The upper ends of the reinforcing bars (6) extend out of the concrete (5), and the lower ends of the reinforcing bars (6) are welded to the steel bar mesh (2).

6. The mass concrete foundation of a bridge according to claim 5, wherein, The upper half of the reinforcing bar (6) is connected to the bridge pier, and the lower half of the steel casing (4) is connected to the pile foundation.

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