A precast segmented capping beam

Abstract

A precast segmented capping beam, comprising a falsework and segmented capping beams. The segmented capping beams are placed on the falsework and are arranged oppositely, and a wet joint section is formed between the oppositely arranged segmented capping beams. The segmented capping beams are composed of steel bars and concrete. The segmented capping beam is formed by connecting several segmented bodies. Mechanical sleeves are provided between adjacent segmented bodies for connection, and mechanical sleeves connected to the segmented capping beams are also provided at the wet joint section. Grouting sleeves and prestressed steel strand groups are arranged in the segmented capping beams. The grouting sleeves are arranged at the bottom of the segmented capping beams, and the prestressed steel strand groups are arranged along the length direction of the segmented capping beams. Compared with the prior art, several mutually parallel prestressed channels extending along the stress direction of the capping beam are inserted before concrete pouring. Prestressed steel strands are arranged in the prestressed channels, fixed by P-anchors at both ends, and tensioned to a specified length by a jack, which is applicable to the construction of large capping beams.

Description

Technical Field

[0001] The present invention belongs to the field of building construction, and in particular, to a precast segmented capping beam. Background Art

[0002] Precast segmented capping beam products have wide application value in the field of bridge construction and research. However, traditional construction methods require prefabricating the capping beam first and then transporting it to the construction site for integral hoisting. This approach is very suitable for the construction of medium and small-sized capping beams. However, for the construction of large capping beams, it is difficult to have a matching hoisting tool for hoisting operations on-site, and due to their large volume and weight, the construction conditions have high requirements and there are potential safety hazards.

[0003] Existing capping beam products have the following disadvantages: First, for traditional cast-in-situ capping beams, it is difficult to accurately control the stirrup spacing, main reinforcement spacing, position of embedded parts, and position of corrugated pipes during on-site assembly of the steel reinforcement cage, resulting in a deviation between the stress condition of the cast finished product and the design drawing, reducing the safety of the bridge; Second, for cast-in-situ capping beams, the next process can only be carried out after the concrete strength reaches the strength standard, resulting in an extended construction period and increased costs; Third, for integral precast capping beams, the construction requires prefabrication first and then transportation to the construction site for integral hoisting. This method is only applicable to the construction of medium and small-sized capping beams. For large capping beams, it is difficult to have a matching hoisting tool on-site, the construction requirements are high, and there are potential safety hazards.

[0004] In addition, due to the large variety of capping beam types, with variable structural dimensions and shapes, in order to meet the pouring requirements of capping beams with different parameters, realize the recycling and universality of steel formwork, and optimize the formwork utilization rate, therefore, a precast segmented capping beam with low requirements for capping beam prefabrication and on-site hoisting construction and suitable for large capping beam construction is developed. Summary of the Invention

[0005] The present invention aims to overcome the above-mentioned defects in the prior art and provides a precast segmented capping beam that is convenient for construction, easy to hoist and transport, and suitable for mass production.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: a precast segmented capping beam, including a falsework and a segmented capping beam. The segmented capping beams are placed on the falsework and are arranged oppositely, and a wet joint section is formed between the oppositely arranged segmented capping beams. The segmented capping beam is composed of steel bars and concrete. The segmented capping beam is formed by connecting several segmented bodies. A connected mechanical sleeve is provided between adjacent segmented bodies, and a mechanical sleeve connected to the segmented capping beam is also provided at the wet joint section; a grouting sleeve and a prestressed steel strand group are provided in the segmented capping beam. The grouting sleeve is arranged at the bottom of the segmented capping beam, and the prestressed steel strand group is arranged along the length direction of the segmented capping beam; the prestressed steel strand group includes a first prestressed steel strand group and a second prestressed steel strand group arranged oppositely. The first prestressed steel strand group is composed of multiple first prestressed steel strands arranged side by side, and the second prestressed steel strand group is composed of multiple second prestressed steel strands arranged side by side. The first prestressed steel strands and the second prestressed steel strands are alternately arranged along the width direction of the segmented capping beam; one end of the first prestressed steel strand is anchored and connected to the end of the segmented capping beam, and the other end of the first prestressed steel strand is fixedly connected to the inside of the segmented capping beam. Similarly, one end of the second prestressed steel strand is anchored and connected to the end of the segmented capping beam, and the other end of the second prestressed steel strand is fixedly connected to the inside of the segmented capping beam; the first prestressed steel strand and the second prestressed steel strand are respectively anchored and connected to the opposite ends of the segmented capping beam.

[0007] As a preferred solution of the present invention, the mechanical sleeves on the wet joint section include a top mechanical sleeve and a bottom mechanical sleeve. The top mechanical sleeve is located at the top of the wet joint section, and the bottom mechanical sleeve is located at the bottom of the wet joint section. Side lap steel bars are provided on the side of the wet joint section.

[0008] As a preferred solution of the present invention, multiple first prestressed steel strands are symmetrically arranged along the middle of the main body width. Similarly, multiple second prestressed steel strands are symmetrically arranged along the middle of the main body width, and the number of the first prestressed steel strands is the same as that of the second prestressed steel strands. The outermost first prestressed steel strands are located on both sides of the outermost second prestressed steel strands, and two second prestressed steel strands arranged side by side are provided between the innermost first prestressed steel strands.

[0009] As a preferred solution of the present invention, the first prestressed steel strands and the second prestressed steel strands are at the same horizontal height, the lengths of the first prestressed steel strands and the second prestressed steel strands are the same, the lengths of the first prestressed steel strands and the second prestressed steel strands are both less than the length of the main body, and the lengths of the first prestressed steel strands and the second prestressed steel strands are greater than half of the length of the main body.

[0010] As a preferred embodiment of the present invention, the anchorage of the first prestressed steel strand to the end of the main body is a horizontal structure, and the first prestressed steel strand gradually slopes upward along the length direction of the main body, and the middle part of the main body is the highest point of the first prestressed steel strand. After passing through the middle part of the main body, the first prestressed steel strand slopes downward.

[0011] As a preferred embodiment of the present invention, the anchorage of the second prestressed steel strand to the end of the main body is a horizontal structure, and the second prestressed steel strand gradually slopes upward along the length direction of the main body, and the middle part of the main body is the highest point of the second prestressed steel strand. After passing through the middle part of the main body, the second prestressed steel strand slopes downward.

[0012] As a preferred embodiment of the present invention, during the tensioning process of the first prestressed steel strand group and the second prestressed steel strand group, the first prestressed steel strand and the second prestressed steel strand are tensioned sequentially from the outside to the inside along the width direction of the main body.

[0013] As a preferred embodiment of the present invention, an anchor backing plate, a working anchor plate, a sleeve backing plate and a steel sleeve are provided at the anchorage of the first prestressed steel strand or the second prestressed steel strand to the main body. The anchor backing plate is connected to the first prestressed steel strand or the second prestressed steel strand. Both sides of the sleeve backing plate are fixedly connected to the steel sleeve and the anchor backing plate respectively. The working anchor plate is located inside the steel sleeve and is connected to the anchor backing plate.

[0014] As a preferred embodiment of the present invention, the sleeve backing plate and the steel sleeve are fixedly connected by welding, and the sleeve backing plate and the anchor backing plate are fixedly connected by bolts.

[0015] As a preferred embodiment of the present invention, a grouting hole is formed on the sleeve backing plate.

[0016] The beneficial effect of the present invention is that, compared with the prior art: several mutually parallel prestressed channels extending along the stress direction of the capping beam are inserted before the concrete pouring. Prestressed steel strands are arranged in the prestressed channels, fixed by P-anchors at both ends, and tensioned to a specified length by a jack, which is applicable to the construction of large capping beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a connection schematic diagram of the segmented capping beam and the wet connection section;

[0019] Figure 3 is Figure 2 a cross-sectional view taken along the plane 1-1 in

[0020] Figure 4 is Figure 2 a cross-sectional view taken along the plane 2-2 in

[0021] Figure 5 is Figure 2 The sectional view of Plane 2-2 in it;

[0022] Figure 6 is the overall schematic diagram of the capping beam;

[0023] Figure 7 is Figure 6 The sectional view at A-A;

[0024] Figure 8 is Figure 6 The sectional view at B-B;

[0025] Figure 9 is Figure 6 The sectional view at C-C;

[0026] Figure 10 is Figure 6 The sectional view at D-D;

[0027] Figure 11 is the layout schematic diagram of the first prestressed steel strand group and the second prestressed steel strand group;

[0028] Figure 12 is the structural schematic diagram of the first prestressed steel strand;

[0029] Figure 13 is the structural schematic diagram of the second prestressed steel strand;

[0030] Figure 14 is the anchorage schematic diagram of the prestressed steel strand;

[0031] Figure 15 is the anchorage schematic diagram of the prestressed steel strand;

[0032] In the figure, the reference signs: segmental capping beam 1, prestressed steel strand group 2, first prestressed steel strand group 3, first prestressed steel strand 3-1, second prestressed steel strand group 4, second prestressed steel strand 4-1, grouting sleeve 5, anchor backing plate 6, working anchor plate 7, sleeve backing plate 8, steel sleeve 9, bolt 10, grouting hole 11, falsework 12, wet connection section 13, mechanical sleeve 14, top mechanical sleeve 14-1, bottom mechanical sleeve 14-2, side lapped reinforcement 15. Specific embodiments

[0033] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] As Figure 1-15As shown in the figure, a precast segmented capping beam includes a falsework 12 and a segmented capping beam 1. The falsework 12 has the segmented capping beams 1 arranged oppositely thereon, and a wet joint section 13 is formed between the oppositely arranged segmented capping beams 1. The segmented capping beam 1 is composed of steel bars and concrete. The segmented capping beam 1 is formed by connecting several segmented bodies. A connected mechanical sleeve 14 is provided between adjacent segmented bodies, and a mechanical sleeve 14 connected to the segmented capping beam 1 is also provided at the wet joint section 13. A grouting sleeve 5 and a prestressed steel strand group 2 are provided in the segmented capping beam 1. The grouting sleeve 5 is arranged at the bottom of the segmented capping beam 1, and the prestressed steel strand group 2 is arranged along the length direction of the segmented capping beam 1. The prestressed steel strand group 2 includes a first prestressed steel strand group 3 and a second prestressed steel strand group 4 arranged oppositely. The first prestressed steel strand group 3 is composed of multiple first prestressed steel strands 3-1 arranged side by side, and the second prestressed steel strand group 4 is composed of multiple second prestressed steel strands 4-1 arranged side by side. The first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 are alternately arranged along the width direction of the segmented capping beam 1. One end of the first prestressed steel strand 3-1 is anchored and connected to the end of the segmented capping beam 1, and the other end of the first prestressed steel strand 3-1 is fixedly connected to the inside of the segmented capping beam 1. Similarly, one end of the second prestressed steel strand 4-1 is anchored and connected to the end of the segmented capping beam 1, and the other end of the second prestressed steel strand 4-1 is fixedly connected to the inside of the segmented capping beam 1. The first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 are respectively anchored and connected to the opposite ends of the segmented capping beam 1.

[0035] The falsework 12 is designed according to the size of the segmented capping beam 1, and an inclined support adapted to the bottom slope of the segmented capping beam 1 is formed on the falsework 12. The support steel bars of the segmented capping beam 1 are erected on the falsework 12, and the segmented capping beam 1 is cast into shape. The segmented capping beam 1 is connected to the wet joint section 13 through the mechanical sleeve 14.

[0036] The mechanical sleeve 14 on the wet joint section 13 includes a top mechanical sleeve 14-1 and a bottom mechanical sleeve 14-2. The top mechanical sleeve 14-1 is located at the top of the wet joint section 13, and the bottom mechanical sleeve 14-2 is located at the bottom of the wet joint section 13. Side lap steel bars 15 are provided on the side of the wet joint section 13.

[0037] The size of the main body is set according to actual needs. The steel bars include frame steel bars, transverse steel bars, longitudinal steel bars and vertical steel bars. The concrete is cast for the steel bars, and a suitable bellows is formed in the main body. The prestressed steel strand group 2 is arranged in the bellows, and the grouting sleeve 5 is tied to the steel bars.

[0038] The quantity of the first prestressed steel strands 3-1 and the quantity of the second prestressed steel strands 4-1 are set according to actual needs and the width of the main body. When the width of the main body is relatively large, a larger number of the first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 are set.

[0039] The first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 are arranged in parallel, and the first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 do not interfere with each other.

[0040] Multiple first prestressed steel strands 3-1 are symmetrically arranged along the middle of the width of the main body. Similarly, multiple second prestressed steel strands 4-1 are symmetrically arranged along the middle of the width of the main body, and the quantity of the first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 is the same.

[0041] The number of strands of the first prestressed steel strands 3-1 is an even number. Similarly, the number of strands of the second prestressed steel strands 4-1 is also an even number, so as to facilitate the symmetrical arrangement of the first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 along the middle of the width of the main body. The outermost first prestressed steel strands 3-1 are located on both sides of the outermost second prestressed steel strands 4-1. There are two second prestressed steel strands 4-1 arranged side by side between the innermost first prestressed steel strands 3-1. The adjacent first prestressed steel strands 3-1 have the same spacing, and the adjacent second prestressed steel strands 4-1 have the same spacing. The spacing between the adjacent first prestressed steel strands 3-1 or the second prestressed steel strands 4-1 is also the same.

[0042] On the width of the main body, the first prestressed steel strands 3-1 or the second prestressed steel strands 4-1 are arranged at equal intervals along the main body, so as to better tension the main body.

[0043] The first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 are at the same horizontal height. The first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 have the same length. The lengths of the first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 are both less than the length of the main body, and the lengths of the first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 are greater than half of the length of the main body.

[0044] Ensure that the first prestressed steel strands 3-1 and the second prestressed steel strands 4-1 extend from one end of the main body to the other end of the main body as far as possible without connecting the opposite ends of the main body.

[0045] The anchoring part of the first prestressed steel strands 3-1 and the end of the main body is a horizontal structure, and the first prestressed steel strands 3-1 gradually incline upward along the length direction of the main body. The middle part of the main body is the highest point of the first prestressed steel strands 3-1. After passing through the middle part of the main body, the first prestressed steel strands 3-1 incline downward.

[0046] The anchorage of the second prestressed steel strand 4-1 to the main body end is a horizontal structure, and the second prestressed steel strand 4-1 gradually slopes upward along the length direction of the main body. The middle part of the main body is the highest point of the second prestressed steel strand 4-1, and after passing through the middle part of the main body, the second prestressed steel strand 4-1 slopes downward.

[0047] The horizontal structures of the first prestressed steel strand 3-1 and the second prestressed steel strand 4-1 make the first prestressed steel strand 3-1 and the second prestressed steel strand 4-1 perpendicular to the main body end, thus facilitating the anchorage of the ends of the first prestressed steel strand 3-1 and the second prestressed steel strand 4-1.

[0048] The bending points of the first prestressed steel strand 3-1 and the second prestressed steel strand 4-1 are at the middle part of the main body, which is convenient for the first prestressed steel strand 3-1 and the second prestressed steel strand 4-1 to bear force, so that the middle part of the main body has better tensile strength and ensures the integrity of the main body.

[0049] During the tensioning process of the first prestressed steel strand group 3 and the second prestressed steel strand group 4, the first prestressed steel strand 3-1 and the second prestressed steel strand 4-1 are tensioned in sequence from the outside to the inside along the width direction of the main body.

[0050] At the anchorage of the first prestressed steel strand 3-1 or the second prestressed steel strand 4-1 to the main body, there are an anchor backing plate 6, a working anchor plate 7, a sleeve backing plate 8 and a steel sleeve 9. The anchor backing plate 6 is connected to the first prestressed steel strand 3-1 or the second prestressed steel strand 4-1. The two sides of the sleeve backing plate 8 are respectively fixedly connected to the steel sleeve 9 and the anchor backing plate 6. The working anchor plate 7 is located inside the steel sleeve 9 and is connected to the anchor backing plate 6. The sleeve backing plate 8 and the steel sleeve 9 are fixedly connected by welding, and the sleeve backing plate 8 and the anchor backing plate 6 are fixedly connected by bolts 10. A grouting hole 11 is formed on the sleeve backing plate 8.

[0051] The grouting hole 11 is used for grouting the corrugated pipe, and the steel sleeve 9 facilitates the later-stage anchor sealing operation.

[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0053] Although the following terms are used more frequently in this text: sectional bent cap 1, prestressed steel strand group 2, first prestressed steel strand group 3, first prestressed steel strand 3-1, second prestressed steel strand group 4, second prestressed steel strand 4-1, grouting sleeve 5, anchor backing plate 6, working anchor plate 7, sleeve backing plate 8, steel sleeve 9, bolt 10, grouting hole 11, falsework 12, wet joint section 13, mechanical sleeve 14, top mechanical sleeve 14-1, bottom mechanical sleeve 14-2, side lapped reinforcement 15, etc., the possibility of using other terms is not excluded; the use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A precast segmented capping beam, comprising a falsework (12) and a segmented capping beam (1). The falsework (12) has the segmented capping beams (1) arranged oppositely thereon, and a wet joint section (13) is formed between the oppositely arranged segmented capping beams (1). The segmented capping beam (1) is composed of steel bars and concrete. It is characterized in that The segmented capping beam (1) is formed by connecting several segmented bodies. A connected mechanical sleeve (14) is provided between adjacent segmented bodies, and a mechanical sleeve (14) connected to the segmented capping beam (1) is also provided at the wet joint section (13). A grouting sleeve (5) and a prestressed steel strand group (2) are provided inside the segmented capping beam (1). The grouting sleeve (5) is arranged at the bottom of the segmented capping beam (1), and the prestressed steel strand group (2) is arranged along the length direction of the segmented capping beam (1). The prestressed steel strand group (2) includes a first prestressed steel strand group (3) and a second prestressed steel strand group (4) arranged oppositely. The first prestressed steel strand group (3) is composed of multiple first prestressed steel strands (3-1) arranged side by side, and the second prestressed steel strand group (4) is composed of multiple second prestressed steel strands (4-1) arranged side by side. The first prestressed steel strands (3-1) and the second prestressed steel strands (4-1) are alternately arranged along the width direction of the segmented capping beam (1). One end of the first prestressed steel strand (3-1) is anchored to the end of the segmented capping beam (1), and the other end of the first prestressed steel strand (3-1) is fixedly connected inside the segmented capping beam (1). Similarly, one end of the second prestressed steel strand (4-1) is anchored to the end of the segmented capping beam (1), and the other end of the second prestressed steel strand (4-1) is fixedly connected inside the segmented capping beam (1). The first prestressed steel strands (3-1) and the second prestressed steel strands (4-1) are respectively anchored to the opposite ends of the segmented capping beam (1). The first prestressed steel strands (3-1) and the second prestressed steel strands (4-1) are at the same horizontal height, and the lengths of the first prestressed steel strands (3-1) and the second prestressed steel strands (4-1) are the same. The lengths of the first prestressed steel strands (3-1) and the second prestressed steel strands (4-1) are both less than the length of the segmented capping beam (1), and the lengths of the first prestressed steel strands (3-1) and the second prestressed steel strands (4-1) are greater than half of the length of the segmented capping beam (1). An anchor plate (6), a working anchor plate (7), a sleeve plate (8), and a steel sleeve (9) are provided at the anchorage of the first prestressed steel strand (3-1) or the second prestressed steel strand (4-1) and the segmented capping beam (1). The anchor plate (6) is connected to the first prestressed steel strand (3-1) or the second prestressed steel strand (4-1). Both sides of the sleeve plate (8) are fixedly connected to the steel sleeve (9) and the anchor plate (6) respectively. The working anchor plate (7) is located inside the steel sleeve (9), and the working anchor plate (7) is connected to the anchor plate (6). During the tensioning process of the first prestressed steel strand group (3) and the second prestressed steel strand group (4), the first prestressed steel strands (3-1) and the second prestressed steel strands (4-1) are tensioned in sequence from the outside to the inside along the width direction of the segmented capping beam (1).At the horizontal structure of the first prestressed steel strand (3-1) and the second prestressed steel strand (4-1), the first prestressed steel strand (3-1) and the second prestressed steel strand (4-1) are arranged perpendicular to the end of the main body, so as to facilitate the anchoring of the ends of the first prestressed steel strand (3-1) and the second prestressed steel strand (4-1).; 2. A precast segmented capping beam according to claim 1, It is characterized in that The mechanical sleeves (14) on the wet joint section (13) include a top mechanical sleeve (14-1) and a bottom mechanical sleeve (14-2). The top mechanical sleeve (14-1) is located at the top of the wet joint section (13), and the bottom mechanical sleeve (14-2) is located at the bottom of the wet joint section (13). Side lap steel bars (15) are provided on the side of the wet joint section (13).

3. A precast segmented capping beam according to claim 1, It is characterized in that Multiple first prestressed steel strands (3-1) are symmetrically arranged along the middle of the width of the segmented capping beam (1). Similarly, multiple second prestressed steel strands (4-1) are symmetrically arranged along the middle of the width of the segmented capping beam (1), and the number of the first prestressed steel strands (3-1) is the same as that of the second prestressed steel strands (4-1). The outermost first prestressed steel strands (3-1) are located on both sides of the outermost second prestressed steel strands (4-1), and two second prestressed steel strands (4-1) arranged side by side are provided between the innermost first prestressed steel strands (3-1).

4. A precast segmented capping beam according to claim 3, It is characterized in that The anchorage at the end of the first prestressed steel strand (3-1) and the segmented capping beam (1) is a horizontal structure, and the first prestressed steel strand (3-1) gradually slopes upward along the length direction of the segmented capping beam (1), and the middle of the segmented capping beam (1) is the highest point of the first prestressed steel strand (3-1). After passing through the middle of the segmented capping beam (1), the first prestressed steel strand (3-1) slopes downward.

5. A precast segmented capping beam according to claim 3, It is characterized in that The anchorage at the end of the second prestressed steel strand (4-1) and the segmented capping beam (1) is a horizontal structure, and the second prestressed steel strand (4-1) gradually slopes upward along the length direction of the segmented capping beam (1), and the middle of the segmented capping beam (1) is the highest point of the second prestressed steel strand (4-1). After passing through the middle of the segmented capping beam (1), the second prestressed steel strand (4-1) slopes downward.

6. A precast segmented capping beam according to claim 1, It is characterized in that The sleeve backing plate (8) and the steel sleeve (9) are fixedly connected by welding, and the sleeve backing plate (8) and the anchor backing plate (6) are fixedly connected by bolts (10).

7. A precast segmented capping beam according to claim 6, It is characterized in that The sleeve backing plate (8) is formed with a grouting hole (11).

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