A semi-inverted T invisible cap beam structure

Abstract

A semi-inverted T invisible cap beam structure, where the two sides of the simply supported beams are placed on the inverted T-shaped cap beam, the middle beam of the simply supported beam is provided with a corbel, and the two sides of the corbel are located above the top of the inverted T part of the cap beam. In the longitudinal direction of the bridge, there is a gap between the end faces of the corbels of the middle beams of the simply supported beams on both sides, and there is a gap between the end faces of the side beams of the simply supported beams on both sides, and the gap is processed by the bridge deck continuous or expansion joint structure; in the longitudinal direction of the bridge, the inverted T part of the cap beam is located between the left and right simply supported beams, in the transverse direction of the bridge, the inverted T part of the cap beam is located between the side beams on both sides, and in the height direction, the inverted T part of the cap beam is located below the middle beam corbel, so that the inverted T part of the cap beam is blocked by the simple supported beams on both sides in the above three directions, achieving an invisible effect. It has the advantages of low building height of conventional inverted T cap beams, and at the same time, the inverted T part of the cap beam can be blocked by the simply supported beams, and there is only one gap left at the bridge deck. Compared with conventional inverted T cap beams, it has the unique advantages of simple continuous bridge deck construction, good driving comfort, and good landscape effect.

Description

Technical Field

[0001] The invention relates to the technical field of bridge structure design, and in particular to a semi-inverted T-shaped invisible cap beam structure. Background Art

[0002] At present, simply supported beams are widely used in small and medium span bridges due to their simple structure, suitability for prefabrication and assembly technology, and fast construction speed. Placing multiple simply supported beams on an inverted T-shaped cap beam is a common bridge structure. Conventional inverted T-shaped cap beams have the advantage of low structural height and are widely used in urban elevated roads. However, the inverted T part forms two gaps with the simply supported beams on the left and right sides, which brings about the disadvantages of high requirements for continuous structural construction of the bridge deck, poor durability, double seam setting at the expansion joint affecting driving comfort, and poor appearance. Summary of the invention

[0003] The purpose of the present invention is to provide a semi-inverted T invisible cap beam structure, which has the advantage of low building height of conventional inverted T cap beams. At the same time, after the special structural treatment of the simply supported beam and the cap beam, the inverted T part of the cap beam can be blocked by the simply supported beam on the top surface, the vertical surface and the side surface, and only one gap is left at the bridge deck (the expansion joint and the continuous joint of the bridge deck are reduced by half compared with the ordinary inverted T cap beam). Compared with the conventional inverted T cap beam, it has the unique advantages of simple continuous construction of the bridge deck, good driving comfort and good landscape effect.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a semi-inverted T invisible cap beam structure, characterized in that the simply supported beams on both sides are placed on the inverted T-shaped cap beam, and the upper edges of the two ends of the middle beam of the simply supported beam are provided with bridge-direction corbels, the bridge-direction corbels on both sides are located above the top of the inverted T-shaped part of the cap beam, and the inverted T-shaped part of the transverse bridge-direction cap beam extends to a certain distance from the end of the cap beam, and a transverse bridge-direction corbel is formed at the transverse bridge-direction end of the cap beam, so that the side beams on both sides can be free from the interval of the inverted T-shaped part; in the bridge-direction, a gap is provided between the end faces of the bridge-direction corbels of the middle beams of the simply supported beams on both sides, and the side beams of the simply supported beams on both sides pass through the two sides of the inverted T-shaped part of the cap beam, and a gap is provided between the end faces, and the above-mentioned gap is processed by a continuous or expansion joint structure of the bridge deck; in the bridge-direction, the inverted T-shaped part of the cap beam is located between the left and right simply supported beams, in the transverse bridge-direction, the inverted T-shaped part of the cap beam is located between the side beams on both sides, and in the height direction, the inverted T-shaped part of the cap beam is located below the bridge-direction corbels of the middle beam, so that the inverted T-shaped part of the cap beam is blocked by the simply supported beams on both sides in the above three directions, thereby achieving an invisible effect.

[0005] Furthermore, permanent supports are provided on the corbels on both sides of the inverted T-shaped cap beam for placing simply supported beams on both sides.

[0006] Furthermore, in the longitudinal direction of the bridge, a gap is provided between the ends of the middle beams of the simply supported beams on both sides, i.e., the roots of the corbels in the longitudinal direction of the bridge and the inverted T-part of the cap beam; in the transverse direction of the bridge, a gap is provided between the side faces of the side beams of the simply supported beams and the side faces of the inverted T-part of the cap beam; in the height direction, a gap is provided between the bottom of the corbels in the longitudinal direction of the middle beams of the simply supported beams and the top of the inverted T-part of the cap beam; the above-mentioned gaps do not require bridge deck continuity or expansion joint construction treatment.

[0007] Furthermore, the transverse corbel structure at the transverse end of the semi-inverted T invisible cap beam is a key stress-bearing location, and the downward bending of the prestressed steel strands at the transverse corbel can effectively improve the shear resistance of the corbel.

[0008] Furthermore, the end of the prestressed steel bundle extending to the side of the cap beam is set as a tensioning end, and the end extending to the bottom of the cap beam is set as a fixed end, thereby avoiding the tensioning and anchoring construction of the prestressed steel bundle at the bottom of the cap beam and reducing the construction difficulty.

[0009] Another object of the present invention is to provide a construction method of a semi-inverted T invisible cap beam structure, comprising the following steps:

[0010] A. Casting of semi-inverted T-shaped cap beam concrete or installation of semi-inverted T-shaped cap beam concrete segments;

[0011] B. The first batch of prestressed steel strands for tensioning cap beams;

[0012] C. Hoist the middle beam and side beams; the simply supported beams on both sides are placed on the inverted T-shaped cap beam through supports, the middle beam is provided with a bridge-oriented corbel, the bridge-oriented corbels of the middle beams on both sides are located above the top of the inverted T-shaped part of the cap beam, and a gap is provided between the end faces of the bridge-oriented corbels of the middle beams on both sides in the bridge direction, and a gap is provided between the end faces of the simply supported beams and side beams on both sides;

[0013] D. The second batch of prestressed steel strands for the tensioned cap beam;

[0014] E. According to the design plan, the gap mentioned in C shall be treated with a continuous bridge deck or expansion joint structure.

[0015] The "semi-inverted T invisible cap beam" of the present invention is relative to the conventional inverted T-shaped cap beam. The inverted T part of the cap beam in the transverse direction does not extend to the end of the cap beam, so that the side beams on both sides are not separated by the inverted T part; in the height direction, the top height of the inverted T part is lower than the top height of the simply supported beam, so that the middle beam can pass through the top of the inverted T by setting a corbel on the top.

[0016] The technical solution of the present invention has obvious technical characteristics. First, the inverted T-part of the cap beam is shielded by the simply supported beams on both sides to achieve an invisible effect. Second, through the structure of the present invention, the position of the continuous joint and expansion joint of the bridge deck is transferred from between the simply supported beams on both sides and the inverted T-part of the conventional inverted T cap beam to between the simply supported beams on both sides, and the expansion joint and continuous joint of the bridge deck are reduced from two in the conventional inverted T cap beam to one, so the performance is more reliable, the process is simpler, and the driving comfort is better. Third, when calculating the force, the cap beam is free from the influence of temperature gradient, thereby improving the structural safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a detailed view of the vertical layout of the structure along the bridge direction of the present invention (the outline of the cap beam structure is for reference only and is not limited to the outer outline shape in the figure);

[0018] Figure 2 The AA cross-sectional layout diagram of the present invention is constructed (the cross-sectional simply supported beam is illustrated by a small box beam structure, but is not limited to the use of a small box beam);

[0019] Figure 3 This is a cross-sectional layout diagram of the structure BB of the present invention (the cross-sectional simply supported beam is illustrated with a small box beam structure, but is not limited to the use of a small box beam).

[0020] Figure 4 This is one of the schematic diagrams of the elevation layout of the prestressed steel strands constructed in the present invention (the structural outline of the cap beam and the number and shape of the prestressed steel strands are for reference only and are not limited to the schematic diagram in the figure);

[0021] Figure 5 The second schematic diagram of the elevation layout of the prestressed steel bundle constructed in the present invention (the structural outline of the cap beam and the number and shape of the prestressed steel bundles are for reference only and are not limited to the schematic diagram in the figure);

[0022] Figure 6 This is a schematic diagram of the cross-sectional arrangement of the prestressed steel strands constructed in the present invention (the structural outline of the cap beam and the number and shape of the prestressed steel strands are for reference only and are not limited to what is shown in the figure). DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings:

[0024] The present invention is a semi-inverted T invisible cap beam structure scheme, which is mainly composed of the following parts: a semi-inverted T-shaped cap beam 1, simply supported beams on both sides (side beams 2a, middle beam 2b), a middle beam along the bridge direction corbel 3, simply supported beam supports on both sides (including pad stones) 4, an inverted T part of a semi-inverted T-shaped cap beam 5, a first gap between the side faces of the side beams of the simply supported beam in the transverse direction and the side faces of the inverted T 6, a second gap 7 between the bottom of the corbel along the bridge direction of the middle beam of the simply supported beam and the top of the inverted T, a third gap 8 between the end faces of the corbel along the bridge direction of the middle beam of the simply supported beam and the end faces of the side beams of the simply supported beam, a fourth gap 9 between the end portions (corbel roots) of the middle beams of the simply supported beams on both sides and the inverted T of the cap beam, and a transverse corbel 10 at the transverse ends of the cap beam.

[0025] A semi-inverted T invisible cap beam structure, the specific implementation of which is as follows: the simply supported beams on both sides (side beams 2a, middle beam 2b) are placed on the inverted T-shaped cap beam 1 through supports 4, in the longitudinal direction of the bridge, the inverted T part 5 of the cap beam is located between the simply supported beams on the left and right sides (side beams 2a, middle beam 2b), in the transverse direction of the bridge, the inverted T part 5 of the cap beam is located between the side beams 2a on both sides, and in the height direction, the inverted T part 5 of the cap beam is located below the corbel 3 of the middle beam in the longitudinal direction of the bridge.

[0026] The inverted T-shaped portion 5 of the cap beam is shielded by the simply supported beams on both sides (side beams 2a and middle beams 2b) in the transverse direction, longitudinal direction and height direction of the bridge, achieving an invisible landscape effect; at the same time, the positions of the continuous joints and expansion joints of the bridge deck are transferred from between the simply supported beams on both sides of the conventional inverted T-shaped cap beam and the inverted T-shaped portion (the fourth gap 9) to between the simply supported beams on both sides (the third gap 8), and the number of the joints is reduced by half compared with the conventional inverted T-shaped cap beam, which has the unique advantages of simple continuous construction of the bridge deck and good driving comfort.

[0027] In the present invention, a transverse bridge-direction corbel 10 is provided at the transverse end of the bottom of the cap beam, and the transverse bridge-direction corbel 10 is a key stress-bearing part. The transverse bridge direction of the cap beam is provided with a first batch of steel bundles N1 and a second batch of steel bundles arranged at the inverted T portion of the cap beam, wherein the second batch of prestressed steel bundles include a second steel bundle N2, a third steel bundle N3, a fourth steel bundle N4, and a fifth steel bundle N5 arranged in a staggered manner. The second batch of prestressed steel bundles are bent downward at the transverse bridge-direction corbel, which can effectively improve the shear resistance of the corbel;

[0028] Both ends of the first batch of prestressed steel tendons N1 are tensioning ends, which are set on the side of the inverted T-part of the cap beam, while the end of the second batch of prestressed steel tendons extending to the side of the cap beam is set as the tensioning end, and the end extending to the bottom of the cap beam is set as the fixed end, which avoids the tensioning and anchoring construction of the prestressed steel tendons at the bottom of the cap beam and reduces the construction difficulty.

[0029] A semi-inverted T invisible cap beam structure, the details of which are described as follows: in the longitudinal direction of the bridge, a third gap 8 is provided between the end faces of the corbels 3 along the bridge direction of the middle beams 2b of the simply supported beams on both sides and between the end faces of the side beams 2a of the simply supported beams on both sides, and the third gap 8 is treated as a bridge deck continuous or expansion joint structure. In the longitudinal direction of the bridge, a fourth gap 9 is provided between the end of the middle beams 2b of the simply supported beams on both sides (the root of the corbels 3 along the bridge direction of the middle beam) and the inverted T part 5 of the cap beam; in the transverse direction of the bridge, a first gap 6 is provided between the side of the simply supported beam side beam 2a and the side of the inverted T part 5; in the height direction, a second gap 7 is provided between the bottom of the corbel 3 along the bridge direction of the middle beam of the simply supported beam 2a and the top of the inverted T part 5; the fourth gap 9, the first gap 6, and the second gap 7 do not need to be treated as a bridge deck continuous or expansion joint structure.

[0030] A semi-inverted T invisible cap beam structure, the specific implementation steps of which are:

[0031] A. Casting of semi-inverted T-shaped cap beam concrete or installation of semi-inverted T-shaped cap beam concrete segments;

[0032] B. Before the construction of the simply supported beams on both sides, the first batch of prestressed steel strands ( Figure 4 The first steel bundle N1);

[0033] C. Construct the simply supported beams (side beams 2a, middle beam 2b) and the middle beam along the bridge direction corbels 3 on both sides. The simply supported beams on both sides are placed on the inverted T-shaped cap beam. The middle beam of the simply supported beam is provided with the middle beam along the bridge direction corbels. The middle beam along the bridge direction corbels on both sides are located above the top of the inverted T-shaped cap beam. In the along the bridge direction, a gap 8 is provided between the end faces of the middle beam along the bridge direction corbels 3 of the middle beams 2b of the simply supported beams on both sides and between the end faces of the side beams 2a of the simply supported beams on both sides;

[0034] D. After the construction of the simply supported beams on both sides, the second batch of prestressed steel strands of the cap beam are tensioned (the second batch of prestressed steel strands include the second steel strand N2, the third steel strand N3, the fourth steel strand N4, and the fifth steel strand N5 which are staggered);

[0035] E. According to the design plan, the gap 8 in C is treated with a continuous bridge deck or expansion joint structure.

[0036] In the description of the present invention, it needs to be explained that the orientations or relative position relationships indicated by the terms "upper", "lower", "both sides", "side", "along the bridge", "transverse to the bridge", "height direction", "top", "bottom", etc. are all based on the orientations or position relationships shown in the accompanying drawings. They are only for the convenience of describing the structure of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0037] Although the above content describes the specific embodiments of the present invention, it should be understood by those skilled in the art that this is only an example, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essential contents of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A semi-inverted T invisible cap beam structure, characterized in that The simply supported beams on both sides are placed on the inverted T-shaped cap beam, and the upper edges of the two ends of the middle beam of the simply supported beam are provided with longitudinal corbels, and the longitudinal corbels on both sides are located above the top of the inverted T-part of the cap beam, and the transverse bridge direction of the inverted T-part of the cap beam extends to a certain distance from the end of the cap beam, and a transverse bridge direction corbel is formed at the transverse bridge direction end of the cap beam, so that the side beams on both sides are not separated by the inverted T-part; in the longitudinal direction, a gap is provided between the end faces of the longitudinal corbels of the middle beams of the simply supported beams on both sides, and the side beams of the simply supported beams on both sides pass through the two sides of the inverted T-part of the cap beam, and a gap is provided between their end faces, and the above-mentioned gap is handled by a continuous or expansion joint structure of the bridge deck; in the longitudinal direction, the inverted T-part of the cap beam is located between the left and right simply supported beams, in the transverse bridge direction, the inverted T-part of the cap beam is located between the side beams on both sides, and in the height direction, the inverted T-part of the cap beam is located below the longitudinal corbel of the middle beam, so that the inverted T-part of the cap beam is blocked by the simply supported beams on both sides in the above three directions, thereby achieving an invisible effect.

2. The semi-inverted T invisible cap beam structure according to claim 1, characterized in that: Permanent supports are provided on the corbels on both sides of the inverted T-shaped cap beam to place the simply supported beams on both sides.

3. The semi-inverted T invisible cap beam structure according to claim 1, characterized in that: In the longitudinal direction of the bridge, a gap is provided between the ends of the middle beams of the simply supported beams on both sides, i.e., the roots of the corbels in the longitudinal direction of the bridge and the inverted T-part of the cap beam; in the transverse direction of the bridge, a gap is provided between the side faces of the side beams of the simply supported beams and the side faces of the inverted T-part of the cap beam; in the height direction, a gap is provided between the bottom of the corbels in the longitudinal direction of the middle beams of the simply supported beams and the top of the inverted T-part of the cap beam; the above-mentioned gaps do not require bridge deck continuity or expansion joint construction treatment.

4. The semi-inverted T invisible cap beam structure according to claim 1, characterized in that: The transverse corbel structure at the transverse end of the semi-inverted T invisible cap beam is the key stress-bearing part. The prestressed steel strands are bent downward at the transverse corbel to effectively improve the shear resistance of the corbel.

5. The semi-inverted T invisible cap beam structure according to claim 4, characterized in that: The end of the prestressed steel bundle extending to the side of the cap beam is set as the tensioning end, and the end extending to the bottom of the cap beam is set as the fixed end, which avoids the tensioning and anchoring construction of the prestressed steel bundle at the bottom of the cap beam and reduces the construction difficulty.

6. The construction method of the semi-inverted T invisible cap beam structure according to claim 1 comprises the following steps: A. Casting of semi-inverted T-shaped cap beam concrete or installation of semi-inverted T-shaped cap beam concrete segments; B. The first batch of prestressed steel strands for tensioning cap beams; C. Hoist the middle beam and side beams; the simply supported beams on both sides are placed on the inverted T-shaped cap beam through supports, the middle beam is provided with a bridge-oriented corbel, the bridge-oriented corbels of the middle beams on both sides are located above the top of the inverted T-shaped part of the cap beam, and a gap is provided between the end faces of the bridge-oriented corbels of the middle beams on both sides in the bridge direction, and a gap is provided between the end faces of the simply supported beams and side beams on both sides; D. The second batch of prestressed steel strands for the tensioned cap beam; E. According to the design plan, the gap mentioned in C shall be treated with a continuous bridge deck or expansion joint structure.

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