A connection structure between an inverted T-shaped cap beam and a main beam

Abstract

The present application relates to a connection structure between an inverted T-shaped cap beam and a main beam, and relates to the technical field of bridge construction. A casting space is formed between the inverted T-shaped cap beam and the main beam; the connection structure includes a paving layer, a tensile layer and a transition layer, the paving layer is used to be laid on the main beam; the tensile layer is used to fill in the casting space, and the top of the tensile layer is connected to the paving layer; the transition layer is used to fill in the casting space, the top of the transition layer is connected to the bottom of the tensile layer, and the bottom is used to press on the inverted T-shaped cap beam; and a gap is opened on the transition layer, and one end of the gap extends to the top of the transition layer. A gap is opened on the transition layer to concentrate stress in the gap in advance. During the tensile deflection of the main beam, the transition layer will be damaged first, and the damage of the transition layer has no effect on the structure of the main beam, so the transition layer plays a role in protecting the main beam.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to a connection structure between an inverted T-shaped cap beam and a main beam. Background Art

[0002] In recent years, with the needs of economic development and urban construction, municipal bridges have been built on a large scale. Since some municipal bridges have high requirements for bridge clearance, the ordinary cap beam + main beam structure is difficult to meet the requirements. Therefore, the inverted T-shaped cap beam + main beam structure is born. The inverted T-shaped cap beam + main beam can effectively reduce the bridge clearance, but it also brings problems such as large expansion joint gaps at the top of the main beam pier, difficulty in continuous bridge deck construction, and poor bridge deck smoothness.

[0003] In the related technologies, the traditional asphalt concrete bridge deck continuous structure is often prone to damage and poor driving comfort due to insufficient material performance. The steel expansion joint structure used as the bridge deck transition often has problems such as poor waterproofness, easy clogging by debris, and high cost. Summary of the invention

[0004] An embodiment of the present application provides a connection structure between an inverted T-shaped cap beam and a main beam to solve the problems of using a steel expansion joint structure as a bridge deck transition in the related art, which has poor waterproofness, easy clogging by debris, and high cost.

[0005] In a first aspect, a connection structure between an inverted T-shaped cap beam and a main beam is provided, wherein a casting space is formed between the inverted T-shaped cap beam and the main beam; the connection structure comprises:

[0006] A paving layer, which is used for laying on the main beam;

[0007] A tensile layer, which is used to fill the casting space, and the top of the tensile layer is connected to the paving layer;

[0008] A transition layer is used to fill the casting space, wherein the top of the transition layer is connected to the bottom of the tensile layer, and the bottom is used to be pressed on the inverted T-shaped cap beam; and a gap is opened on the transition layer, and one end of the gap extends to the top of the transition layer.

[0009] In some embodiments, a distance L1 between a bottom end and a top end of the gap is smaller than a thickness L2 of the transition layer.

[0010] In some embodiments, the distance L1 between the bottom and top of the gap is equal to the thickness L2 of the transition layer.

[0011] In some embodiments, the gap is filled with waterproof material.

[0012] In some embodiments, when the casting space is in a convex shape, the casting space includes a first space and a second space which are arranged vertically and connected; the tensile layer is filled in the first space, and the transition layer is filled in the second space.

[0013] In some embodiments, when the casting space is rectangular, the tensile layer and the transition layer are stacked up and down and connected.

[0014] In some embodiments, the connection structure further comprises a steel bar assembly, wherein the steel bar assembly comprises:

[0015] A first steel mesh, which is buried in the tensile layer along the longitudinal bridge direction;

[0016] Two second steel meshes, the two second steel meshes are arranged at both ends of the gap along the longitudinal bridge direction, and one end of the second steel mesh is used to be buried in the main beam, and the other end extends toward the gap;

[0017] The connecting steel bars have two ends connected to the first steel mesh and the second steel mesh respectively.

[0018] In some embodiments, the tensile layer is made of ultra-high performance concrete.

[0019] In some embodiments, the transition layer is made of ordinary concrete.

[0020] In some embodiments, the bottom end of the transition layer is pressed onto the inverted T-shaped cap beam through a partition.

[0021] The beneficial effects brought about by the technical solution provided by the present application include: when the vehicle load directly acts on the connection structure of the embodiment of the present application, the transition layer is filled between the tensile layer and the inverted T-shaped cap beam, so the load can be effectively transferred to the inverted T-shaped cap beam. When the vehicle load acts on the main beam, causing the two main beams on both sides of the inverted T-shaped cap beam to be pulled and deflected downward, the tensile layer is used to provide the tensile performance of the main beam to prevent the main beam from cracking and being damaged; the transition layer is connected to the main beam as a whole, and when the main beam deflects downward, the transition layer opens along the gap, does not affect the deflection of the main beam, and reduces the influence of the deformation of the main beam on the continuous structure of the bridge deck. Moreover, a gap is opened on the transition layer to concentrate the stress at the gap in advance. During the tensile deflection of the main beam, the transition layer will be damaged first, and the damage of the transition layer has no effect on the structure of the main beam, so the transition layer plays a role in protecting the main beam.

[0022] The embodiment of the present application provides a connection structure between an inverted T-shaped cap beam and a main beam. When the vehicle load directly acts on the connection structure of the embodiment of the present application, the transition layer is filled between the tensile layer and the inverted T-shaped cap beam, which can effectively transfer the load to the inverted T-shaped cap beam. When the vehicle load acts on the main beam, causing the two main beams on both sides of the inverted T-shaped cap beam to be pulled and deflected downward, the tensile layer is used to provide the tensile performance of the main beam to prevent the main beam from cracking and being damaged; the transition layer is connected to the main beam as a whole, so when the main beam deflects downward, the transition layer opens along the gap, does not affect the deflection of the main beam, and reduces the influence of the deformation of the main beam on the continuous structure of the bridge deck. In addition, a gap is opened on the transition layer to concentrate the stress at the gap in advance. During the tensile deflection of the main beam, the transition layer will be damaged first, and the damage of the transition layer has no effect on the structure of the main beam, so the transition layer plays a role in protecting the main beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of the casting space formed by the inverted T-shaped cap beam and the main beam provided in the embodiment of the present application;

[0025] Figure 2 A schematic diagram of the structure of the connection structure between the inverted T-shaped cap beam and the main beam provided in an embodiment of the present application (the casting space is a convex shape);

[0026] Figure 3 A schematic diagram of the structure of the connection structure between the inverted T-shaped cap beam and the main beam provided in an embodiment of the present application (the casting space is a rectangle);

[0027] Figure 4 A schematic diagram of the structure of a steel bar assembly provided in an embodiment of the present application.

[0028] In the figure: 1. inverted T-shaped cap beam; 2. main beam; 3. casting space; 30. first space; 31. second space; 4. pavement layer; 5. tensile layer; 6. transition layer; 7. gap; 8. steel bar assembly; 80. first steel bar mesh; 81. second steel bar mesh; 82. connecting steel bars; 9. partition. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] See also Figure 1 and Figure 2 As shown, an embodiment of the present application provides a connection structure between an inverted T-shaped cap beam and a main beam, wherein a casting space 3 is formed between the inverted T-shaped cap beam 1 and the main beam 2; the connection structure comprises a paving layer 4, a tensile layer 5 and a tensile layer 5 which are arranged in sequence from top to bottom, the paving layer 4 is used for being laid on the main beam 2; the tensile layer 5 is used for filling in the casting space 3, and the top end of the tensile layer 5 is connected to the paving layer 4; the transition layer 6 is used for filling in the casting space 3, the top end of the transition layer 6 is connected to the bottom end of the tensile layer 5, and the bottom end is used for pressing on the inverted T-shaped cap beam 1; and a gap 7 is opened on the transition layer 6, and one end of the gap 7 extends to the top end of the transition layer 6.

[0031] In the connection structure of the embodiment of the present application, the pavement layer 4 is an asphalt waterproof layer. When the vehicle load directly acts on the connection structure of the embodiment of the present application, the transition layer 6 is filled between the tensile layer 5 and the inverted T-shaped cap beam 1, which can effectively transfer the load to the inverted T-shaped cap beam 1. When the vehicle load acts on the main beam 2, causing the two main beams 2 on both sides of the inverted T-shaped cap beam 1 to be pulled and deflected downward, the tensile layer 5 is used to provide the tensile performance of the main beam 2 to prevent the main beam 2 from cracking and being broken; the transition layer 6 is connected to the main beam 2 as a whole. When the main beam 2 deflects downward, the transition layer 6 opens along the gap 7, which does not affect the deflection of the main beam 2, and reduces the influence of the deformation of the main beam 2 on the continuous structure of the bridge deck. In addition, the gap 7 is opened on the transition layer 6 to concentrate the stress at the gap 7 in advance. In the process of tensile deflection of the main beam 2, the transition layer 6 will be damaged first, and the damage of the transition layer 6 has no effect on the structure of the main beam 2, so the transition layer 6 plays a role in protecting the main beam 2.

[0032] Optionally, a distance L1 between a bottom end and a top end of the gap 7 is smaller than a thickness L2 of the transition layer 6 .

[0033] The gap 7 penetrates the transition layer 6 in the transverse direction, and the gap 7 is prefabricated on the transition layer 6 when the transition layer 6 is formed. In the embodiment of the present application, the gap 7 does not divide the transition layer 6 into two halves, and the gap 7 has a tendency to grow during the tension process of the main beam 2. Even if the transition layer 6 is finally broken, it does not affect the structure of the main beam 2. The gap 7 is 8-10 mm wide and 10-15 cm deep.

[0034] Optionally, the distance L1 between the bottom and top of the gap 7 is equal to the thickness L2 of the transition layer 6 .

[0035] In the embodiment of the present application, the transition layer 6 is directly divided into two halves by the gap 7. In this case, if the main beam 2 is pulled to produce an upward deflection, the gap 7 running through the entire transition layer 6 has no effect on the deflection of the main beam.

[0036] Preferably, the gap 7 is filled with waterproof material.

[0037] The gap 7 is filled with a high-viscosity and high-elastic asphalt material for waterproofing without affecting the transition layer 6 from opening at the gap 7 .

[0038] See also Figure 2 As shown, when the pouring space 3 is in a convex shape, the pouring space 3 includes a first space 30 and a second space 31 which are arranged up and down and connected; the tensile layer 5 is filled in the first space 30 , and the transition layer 6 is filled in the second space 31 .

[0039] In this case, the transition layer 6 also plays a leveling role.

[0040] See also Figure 3 As shown, when the casting space 3 is rectangular, the tensile layer 5 and the transition layer 6 are stacked up and connected.

[0041] The thickness of the tensile layer 5 is 50-150 mm. If the tensile layer 5 is too thick, the deflection of the main beam 2 when it is tensile will be affected. If the tensile layer 5 is too thin, the tensile performance will be affected.

[0042] See also Figure 2 and Figure 4 As shown, the connection structure also includes a steel bar assembly 8, which includes a first steel bar mesh 80, two second steel bar meshes 81 and connecting steel bars 82. The first steel bar mesh 80 is buried in the tensile layer 5 along the longitudinal bridge direction; the two second steel bar meshes 81 are arranged at both ends of the gap 7 along the longitudinal bridge direction, and one end of the second steel bar mesh 81 is used to be buried in the main beam 2, and the other end extends toward the gap 7; the two ends of the connecting steel bar 82 are respectively connected to the first steel bar mesh 80 and the second steel bar mesh 81.

[0043] The first steel mesh 80 enhances the strength of the tensile layer 5, and the connecting steel bar 82 is in a "[" shape, with both ends respectively connected to the first steel mesh 80 and the second steel mesh 81. The two second steel meshes 81 are separated at the gap 7, and do not affect the opening of the transition layer 6 at the gap 7.

[0044] Optionally, the tensile layer 5 is made of ultra-high performance concrete.

[0045] The compressive strength of ultra-high performance concrete materials is not less than 100MPa, and the tensile strength is not less than 20MPa. Ultra-high performance concrete is mixed with steel fibers and has the characteristics of no steaming and curing. The thickness of the ultra-high performance concrete layer is 50-150mm; at the same time, the ultra-high performance concrete material used in the ultra-high performance concrete structure layer is mixed with steel fibers, which can effectively reduce structural cracks under load and ensure the smoothness of the bridge deck.

[0046] Optionally, the transition layer 6 is made of ordinary concrete.

[0047] The model of ordinary concrete is C40 or C50. Since the transition layer 6 has a small requirement for tensile performance, ordinary concrete is used to save the most construction cost.

[0048] Optionally, the bottom end of the transition layer 6 is pressed onto the inverted T-shaped cap beam 1 through a partition plate 9 .

[0049] The transition layer 6 and the inverted T-shaped cap beam 1 are not connected as a whole. When the main beam 2 is subjected to tension, the transition layer 6 opens from the gap 7 without affecting the structure of the inverted T-shaped cap beam 1.

[0050] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0051] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0052] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A connection structure between an inverted T-shaped cap beam and a main beam, wherein a casting space (3) is formed between the inverted T-shaped cap beam (1) and the main beam (2); characterized in that: The connection structure includes: A paving layer (4) used for paving on the main beam (2); A tensile layer (5) is used to fill the casting space (3), and the top of the tensile layer (5) is connected to the paving layer (4); A transition layer (6) is used to fill the casting space (3), the top end of the transition layer (6) is connected to the bottom end of the tensile layer (5), and the bottom end is used to be pressed on the inverted T-shaped cap beam (1); and a gap (7) is opened on the transition layer (6), and one end of the gap (7) extends to the top end of the transition layer (6); When the casting space (3) is in a convex shape, the casting space (3) comprises a first space (30) and a second space (31) which are arranged vertically and connected; the tensile layer (5) is filled in the first space (30), and the transition layer (6) is filled in the second space (31); The connection structure further comprises a steel bar assembly (8), wherein the steel bar assembly (8) comprises: A first steel mesh (80) embedded in the tensile layer (5) along the longitudinal direction; Two second steel meshes (81), the two second steel meshes (81) being arranged at both ends of the gap (7) along the longitudinal bridge direction, and one end of the second steel mesh (81) being used to be buried in the main beam (2), and the other end extending toward the gap (7); The connecting steel bars (82) have two ends respectively connected to the first steel mesh (80) and the second steel mesh (81).

2. The connection structure of the inverted T-shaped cap beam and the main beam according to claim 1, characterized in that: The distance L1 between the bottom and top of the gap (7) is smaller than the thickness L2 of the transition layer (6).

3. The connection structure of the inverted T-shaped cap beam and the main beam according to claim 1, characterized in that: The distance L1 between the bottom and top of the gap (7) is equal to the thickness L2 of the transition layer (6).

4. The connection structure of the inverted T-shaped cap beam and the main beam according to claim 1, characterized in that: The gap (7) is filled with waterproof material.

5. The connection structure of the inverted T-shaped cap beam and the main beam according to claim 1, characterized in that: When the casting space (3) is rectangular, the tensile layer (5) and the transition layer (6) are stacked up and down and connected.

6. The connection structure of the inverted T-shaped cap beam and the main beam according to claim 1, characterized in that: The tensile layer (5) is made of ultra-high performance concrete.

7. The connection structure of the inverted T-shaped cap beam and the main beam according to claim 1, characterized in that: The transition layer (6) is made of ordinary concrete.

8. The connection structure of the inverted T-shaped cap beam and the main beam according to claim 1, characterized in that: The bottom end of the transition layer (6) is pressed onto the inverted T-shaped cap beam (1) via a partition plate (9).

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