A large cantilever prestressed bent cap support structure

Abstract

This utility model discloses a support structure for a large cantilever prestressed cap beam, including a concrete base, columns, a cantilever support for the cap beam, piers, and clamps installed on the upper end of the piers. The concrete base is cast on the ground, and its top surface has a groove containing a bearing steel plate. The columns are vertically installed on the corresponding bearing steel plates, and their top surfaces have mounting grooves. The cantilever support for the cap beam includes a main crossbeam, a secondary crossbeam, and diagonal supports. The main crossbeam is erected and installed in the mounting groove at the upper end of the column and fixed to the column by connecting rods. The secondary crossbeams are evenly distributed at equal intervals on the upper end of the main crossbeam. The diagonal supports are installed between the main crossbeam and the column, including a first diagonal support and a second diagonal support. This utility model can meet the high bending load requirements of the prestressed cap beam for the I-beam bearing crossbeam, while avoiding large-area foundation treatment, minimizing the occupation of traffic roads by construction supports, and allowing for fast construction and installation as well as convenient disassembly.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction engineering technology, specifically to a large cantilever prestressed cap beam support structure. Background Technology

[0002] In recent years, with the booming development of urban elevated bridge construction, the scarcity of land resources and the tightness of land for bridge construction have become increasingly prominent. In order to minimize the occupation of land resources and improve space utilization, bridge designs are becoming increasingly complex, with various high-height, long-span, and structurally novel concrete bridges emerging one after another, posing higher requirements for bridge construction. Among the bridge designs, the cap beams are located high, have heavy weight, and long cantilever, resulting in high construction risks, tight schedules, and the need for winter construction. Therefore, the rational selection of the support system is particularly important.

[0003] Traditional full-span scaffolding construction methods have long construction cycles, are cumbersome to set up, have difficult and costly foundation treatment, are prone to uneven settlement, require significant material and personnel investment, and have slow construction speeds. In contrast, using a scaffolding system combining steel pipe columns and steel sections can avoid large-area foundation treatment, has a faster construction speed, and is easy to disassemble and assemble. On the other hand, using only the clamp method relies on the strength and rigidity of the supports and steel formwork to transfer all the reinforcing steel, concrete, formwork, and various construction loads of the cap beam to the columns, thus eliminating the need for ground-based scaffolding in conventional construction and minimizing the obstruction of traffic roads by construction scaffolding. However, this method cannot meet the construction requirements of large cantilever prestressed cap beams exceeding 30 meters. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the existing technology and provide a large cantilever prestressed cap beam support structure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a large cantilever prestressed cap beam support structure, comprising multiple concrete bases, columns, and cap beam cantilever supports. The concrete bases are cast on the ground and arranged in parallel rows, each with a groove on its top surface containing a pressure-bearing steel plate. Each concrete base has a vertically installed column, the lower end of which is connected to the pressure-bearing steel plate, and the upper surface of the column has an installation groove. The cap beam cantilever supports include multiple main crossbeams, multiple secondary crossbeams, and multiple corresponding diagonal supports. Each main crossbeam is installed in the mounting groove at the top of all the columns in a row, and is fixed to the columns by connecting rods. Support connecting rods are installed between two adjacent main crossbeams. Multiple secondary crossbeams are evenly distributed at the top of two main crossbeams. The diagonal support is installed between the main crossbeam and the column, including a first diagonal support and a second diagonal support. The two ends of the first diagonal support are respectively connected to the lower end face of the main crossbeam and the middle part of the column, and the two ends of the second diagonal support are respectively connected to the middle part of the first diagonal support and the upper part of the same column.

[0006] Furthermore, it also includes multiple piers, which are set on the ground between two adjacent main crossbeams. Each pier is equipped with a clamp on its upper part. The clamp consists of two arc-shaped steel plates and several high-strength bolts. The arc of the arc-shaped steel plates is equal to the outer arc of the pier, and the inner side is tightly attached to the pier. They are butt-jointed and fixed by high-strength bolts. A support platform is fixed on the outer arc top of each arc-shaped steel plate. A jack is installed on the upper end of the support platform, and the jack's protruding end rests against the lower end of the main crossbeam.

[0007] Furthermore, the bottom formwork of the cap beam and the pedestrian formwork are installed on the upper end of the secondary crossbeam.

[0008] Preferably, there are an even number of concrete bases, a total of eight, arranged in groups of four in two parallel rows.

[0009] Furthermore, the column is a multi-segment structure, which is spliced ​​together to increase its height, and adjacent column segments are fixedly connected by flanges and bolts.

[0010] Preferably, there are two main crossbeams, which are erected parallel to each other on the upper ends of the corresponding columns; the main crossbeams and the secondary crossbeams are made of I-beams.

[0011] Furthermore, connecting lugs are provided on the main beam and column at the two ends of the first inclined support; connecting lugs are also provided on the first inclined support and column at the two ends of the second inclined support.

[0012] Furthermore, the pier is provided in two parts, and the four jacks on the clamps on it move out synchronously.

[0013] Compared with the prior art, this utility model has the following advantages: This utility model provides a temporary support structure for large cantilever prestressed cap beams, which adopts a support form combining steel pipe columns, steel sections, and clamps. It can meet the high requirements of the prestressed cap beams for the bending bearing capacity of the I-beam load-bearing crossbeams, meet the construction conditions under urban elevated conditions, and overcome the construction load and deformation of large cantilever cap beams. It can also meet the construction of large cantilever prestressed cap beams exceeding 30 meters, avoid large-area foundation treatment, not affect the construction passage in the middle of the pier, minimize the occupation of traffic roads by construction supports, require fewer personnel, have a faster construction and installation speed, and is easy to disassemble, labor-saving to assemble, and low in cost. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a left view of the overall structure of this utility model;

[0016] Figure 3This is a schematic diagram of the top structure between two adjacent columns in this utility model;

[0017] Figure 4 for Figure 3 Left view of the middle structure;

[0018] Figure 5 This is a schematic diagram of the upper end structure of the pier column in this utility model;

[0019] Figure 6 for Figure 5 Left view of the middle structure;

[0020] Figure 7 This is a schematic diagram of the clamp structure in this utility model;

[0021] Figure 8 This is a longitudinal center section view of the clamp in this utility model;

[0022] In the diagram: 1. Concrete base, 2. Column, 3. First diagonal support, 4. Second diagonal support, 5. Main crossbeam, 6. Hoop, 7. Jack, 8. Connecting rod, 9. Support connecting rod, 10. Secondary crossbeam, 11. Bottom formwork of cap beam, 12. Connecting ear plate, 13. Bearing steel plate, 14. High-strength bolt, 15. Support platform, 16. Pier column. Detailed Implementation

[0023] It should be noted that in the description of this utility model, terms such as "upper", "lower", "left", "right", "front", "rear", "top", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are only used to facilitate the description of the structural relationship between the components in this utility model and do not specifically mean that any component in this utility model must have a specific orientation, be constructed and operated in a specific orientation, or be construed as a limitation on this utility model.

[0024] Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "setting," "equipped," etc., 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0026] like Figure 1As shown, a large cantilever prestressed cap beam support structure is installed at the cantilever end of the cap beam, including eight concrete bases 1, eight corresponding columns 2, and cap beam cantilever supports. The eight concrete bases 1 are cast on the ground, in groups of four, arranged in two rows, parallel to each other, and combined with... Figure 2 As shown, each concrete base 1 has a downwardly recessed groove on its top surface, and a pressure-bearing steel plate 13 is fixedly installed at the bottom of the groove. The eight columns 2 are respectively installed on the eight concrete bases 1 in a one-to-one correspondence. The lower end of the column 2 is connected to the pressure-bearing steel plate 13, which facilitates the assembly and disassembly of the column 2. The column 2 is vertically perpendicular to the corresponding concrete base 1, and its upper top surface is provided with an installation groove. The installation groove has a U-shaped structure, and the two vertical side walls of the installation groove are provided with through holes.

[0027] Combined Figures 3 to 4 As shown, the cantilevered support frame for the cap beam includes two main crossbeams 5, multiple secondary crossbeams 10, and multiple sets of diagonal supports installed between the main crossbeams 5 and the columns 2. One main crossbeam 5 is installed at the top of a row of columns 2, positioned within an installation groove at the top of the corresponding column 2. The main crossbeam 5 has a transverse through-hole at the position corresponding to the column 2. When the main crossbeam 5 is placed in the installation groove, a connecting rod 8 passes transversely through the insertion hole on the column 2 and the transverse through-hole on the main crossbeam 5, and is fixed with a nut, thus fixing the main crossbeam 5 to the column 2. The two main crossbeams 5 are installed at the top of two rows of columns 2, with the same height and parallel to each other. Multiple support connecting rods 9, perpendicular to them, are welded and fixed between them. The multiple secondary crossbeams 10 are evenly spaced and fixed to the upper surfaces of the two main crossbeams 5, perpendicular to them. The cap beam bottom formwork 11 and pedestrian template are installed at the upper end of each secondary crossbeam 10.

[0028] Both the main crossbeam 5 and the secondary crossbeam 10 mentioned above are made of I-beams to enhance their strength and prevent deformation.

[0029] Each set of diagonal supports is installed symmetrically between two adjacent columns 2 and the main beam 5, including a first diagonal support 3 and a second diagonal support 4. The two ends of the first diagonal support 3 are respectively connected to the lower end face of the main beam 5 and the middle of the column 2, with connecting lugs 12 at the connection points, and are hinged and fixed by bolts. The two ends of the second diagonal support 4 are respectively connected to the middle of the first diagonal support 3 and the upper part of the same column 2, with connecting lugs 12 at the connection points, and are hinged and fixed by bolts. At this point, the first diagonal support 3 and the second diagonal support 4 form a cross structure to increase their supporting strength.

[0030] The bottom of the large cantilever prestressed cap beam is provided with two piers 16, which are placed on the ground. The two main crossbeams 5 are supported on the front and rear sides of the two piers 16. Each pier 16 is provided with a clamp 6 at the top, combined with... Figures 5 to 8As shown, the clamp 6 consists of two arc-shaped steel plates and several high-strength bolts 14. The arc of the arc-shaped steel plates is equal to the outer arc of the pier column 16, and the inner side is tightly attached to the pier column 16. After the two arc-shaped steel plates are butted together, they are connected and fixed by high-strength bolts 14. Each arc-shaped steel plate has a support platform 15 protruding outward on its outer arc top, which is integrally formed. A jack 7 is fixedly installed on the upper end of the support platform 15. The jack 7's jacking end abuts against the lower end of the corresponding main crossbeam 5. The jack 7 and the column 2 together support the two main crossbeams 5 and can move outward synchronously.

[0031] Furthermore, the column 2 is a multi-segment structure, which is spliced ​​to increase its height. Adjacent columns 2 are fixedly connected by flanges and bolts, which facilitates installation, connection and disassembly.

[0032] In the above-described technical solutions, the terms "first," "second," etc., are used for descriptive purposes only and do not specifically refer to any order or sequence, nor are they intended to limit the present utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature specified with "first" or "second" may explicitly or implicitly include at least one of those features.

[0033] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A large cantilever prestressed bent cap support structure, characterized in that: The system includes multiple concrete bases, columns, and cantilevered cap beam supports. The concrete bases are cast on the ground and arranged in parallel rows. Each base has a groove on its top surface, within which a pressure-bearing steel plate is installed. A column is vertically installed on each concrete base, with its lower end connected to the pressure-bearing steel plate and its upper surface having an installation groove. The cantilevered cap beam supports include multiple main crossbeams, multiple secondary crossbeams, and multiple corresponding diagonal supports. Each main crossbeam is mounted on all the columns in a row. The upper mounting groove is fixedly installed to the column by connecting rods. Support connecting rods are installed between two adjacent main crossbeams. Multiple secondary crossbeams are evenly distributed at the upper ends of the two main crossbeams. The diagonal support is installed between the main crossbeam and the column, including a first diagonal support and a second diagonal support. The two ends of the first diagonal support are respectively connected to the lower end face of the main crossbeam and the middle part of the column. The two ends of the second diagonal support are respectively connected to the middle part of the first diagonal support and the upper part of the same column.

2. The prestressed bent cap support structure of a large cantilever according to claim 1, characterized in that: It also includes multiple piers, which are set on the ground between two adjacent main crossbeams. Each pier is equipped with a clamp on its upper part. The clamp consists of two arc-shaped steel plates and several high-strength bolts. The arc of the arc-shaped steel plates is equal to the outer arc of the pier. The inner side is tightly attached to the pier. They are butted together and fixed by high-strength bolts. A support platform is fixed on the outer arc top of each arc-shaped steel plate. A jack is installed on the upper end of the support platform. The jack's protruding end rests against the lower end of the main crossbeam.

3. The prestressed bent cap support structure of a large cantilever according to claim 2, characterized in that: The bottom formwork of the cap beam and the pedestrian formwork are installed on the upper end of the secondary crossbeam.

4. The prestressed bent cap support structure for a large cantilever according to claim 1, characterized in that: The concrete bases are an even number, totaling eight, arranged in groups of four in two parallel rows.

5. The prestressed bent cap support structure for a large cantilever according to claim 1, characterized in that: The column is a multi-segment structure, which is spliced ​​together to increase its height. Adjacent column segments are fixedly connected by flanges and bolts.

6. The large cantilever prestressed cap beam support structure according to claim 1, characterized in that: The main crossbeam consists of two parallel beams mounted on the upper ends of the corresponding columns; both the main crossbeam and the secondary crossbeam are made of I-beams.

7. The large cantilever prestressed bent cap support structure according to claim 1, characterized in that: Connecting lugs are provided on the main beam and column at the two ends of the first inclined support; connecting lugs are also provided on the first inclined support and column at the two ends of the second inclined support.

8. The large cantilever prestressed bent cap support structure according to claim 2, characterized in that: The pier has two sections, and the four jacks on the clamps on them move out synchronously.

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