Plate girder hinge joint structure and construction method

Abstract

The invention discloses a plate girder hinge joint structure and a construction method, which are used for connecting plate girders at the upper part of a bridge. Opposite hinge joint grooves are formed in the connected side surfaces of every two connected upper plate girders; each hinge joint groove comprises a main groove which is in the shape of a concave trapezoid; an inclined surface is arranged between the upper end of the side wall of one side, close to the upper surface of the corresponding upper plate beam, of each main groove and the upper surface of the corresponding upper plate beam; after every two connected upper plate girders are spliced, a sheet bottom film is arranged between the side walls of one sides, far away from the upper surfaces of the upper plate girders, of the two corresponding main grooves; and each thin-sheet bottom film, the corresponding two main grooves positioned on the two sides and the two inclined surfaces form a hinge joint pouring cavity. During construction, the upper plate girder is sequentially constructed, the sheet bottom film is laid, the flexible asphalt cushion layers are laid at the bottoms of all the main grooves, and UHPC high-performance concrete materials are poured into the hinge joint pouring cavities to form hinge joints. Potential diseases such as slab staggering and damage existing in the expansion joint are effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and particularly to a slab beam hinge joint structure and a construction method thereof. Background Art

[0002] Due to loads, temperature changes, and material shrinkage and creep, displacements occur between the upper structures of bridges. Currently, most conventional bridges use expansion joints to adjust the above displacements.

[0003] However, during the use of expansion joints, there are many potential disease hazards, such as the expansion joints being damaged due to insufficient strength, and debris being easily infiltrated into the expansion joints. In addition, the existence of expansion joints has a greater impact on the flatness of the bridge deck, and phenomena such as steps and vehicle jumps are likely to occur during driving, which will reduce the durability of the bridge and the driving comfort.

[0004] To solve the adverse factors caused by expansion joints to the bridge structure, a large number of studies have improved the durability and corrosion resistance of expansion joints from the perspectives of new materials, construction techniques, maintenance methods, etc. However, under such methods, the bridge still has an actual expansion joint, and the driving comfort is difficult to guarantee.

[0005] Therefore, researchers have proposed the concept of seamless bridges, that is, bridges with continuous upper structures and no expansion devices. Such bridges mostly use special structures and high-performance materials to enable the bridges to not only meet the thermal expansion and contraction of the upper beams but also ensure driving comfort.

[0006] However, most of the existing research on seamless bridges is aimed at bridges where the bridge span direction is parallel to the road forward direction, and there is less research on the case where the bridge span direction is perpendicular to the road forward direction; at the same time, the existing seamless bridge technology is currently mostly applied to medium and small span bridges, and there is still no good solution for larger span cases.

[0007] Therefore, in the field of bridge construction, how to replace the traditional expansion joint device, improve the driving smoothness, meet the temperature deformation in the longitudinal road direction and the normal use of the bridge, and be applicable to longer spans has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0008] In view of the above-mentioned defects of the prior art, the present invention provides a slab beam hinge joint structure and a construction method thereof, aiming to replace the traditional expansion joint device, improve the driving smoothness, meet the temperature deformation in the longitudinal road direction and the normal use of the bridge, and be applicable to longer spans.

[0009] To achieve the above object, the present invention discloses a slab beam hinge joint structure for connecting the upper slab beams of a bridge, including at least two of the upper slab beams that are side-connected.

[0010] On the side where every two adjacent upper plate girders are joined, near the upper position, there are opposite hinge joint grooves provided.

[0011] Each of the hinge joint grooves includes a main groove in the shape of an inward concave trapezoid.

[0012] The cross-section of each main groove is an isosceles trapezoid with the width at the bottom greater than the width at the opening position.

[0013] Between the upper end of one side wall of each main groove close to the upper surface of the corresponding upper plate girder and the upper surface of the corresponding upper plate girder, there is an inclined surface.

[0014] After every two adjacent upper plate girders are spliced, a thin sheet bottom film is provided between the side walls on the side of the corresponding two main grooves away from the upper surface of the upper plate girders.

[0015] Each thin sheet bottom film and the corresponding two main grooves located on both sides, and the two inclined surfaces form a hinge joint casting cavity.

[0016] UHPC high-performance concrete material is poured into each hinge joint casting cavity to form a hinge joint.

[0017] Preferably, a flexible asphalt cushion layer is provided at the bottom of each main groove.

[0018] Preferably, the distance between the side surfaces where every two adjacent upper plate girders are joined is more than 60 millimeters; the width of each hinge joint casting cavity at the position on the upper surface of the corresponding two adjacent upper plate girders is more than 80 millimeters.

[0019] Preferably, an upper paving formed of asphalt concrete is laid on the upper surfaces of all the upper plate girders and the corresponding hinge joints.

[0020] Preferably, the thin sheet bottom film is made of steel.

[0021] The present invention also provides a construction method for the plate girder hinge joint structure, including the following steps:

[0022] Step 1, construct all the upper plate girders;

[0023] Step 2, lay the thin sheet bottom film;

[0024] Step 3, lay a flexible asphalt cushion layer at the bottom of all the main grooves;

[0025] Step 4, pour UHPC high-performance concrete material into the hinge joint casting cavity;

[0026] Step 5, after the UHPC high-performance concrete material reaches the design strength, spread the upper paving formed of asphalt concrete on the upper surfaces of the upper plate girders and the hinge joints.

[0027] Advantages of the present invention:

[0028] The present invention adopts an asphalt flexible layer and UHPC material, which has good durability and stability, and can effectively avoid potential diseases such as uneven settlement and damage existing in traditional expansion joints.

[0029] The application of the present invention can make the bridge deck have no obvious expansion joints, more effectively improve the structural integrity, improve the driving comfort, and is beneficial to the later maintenance, reducing the life cycle cost.

[0030] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the drawings to fully understand the purpose, features and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The structural schematic diagram showing an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] Embodiment

[0033] As Figure 1 shown, the slab beam hinge joint structure is used for connecting the upper slab beams 1 of the bridge, and includes at least two side-connected upper slab beams 1;

[0034] On the side where every two adjacent upper slab beams 1 are connected, a hinge joint groove 3 facing each other is provided near the upper position;

[0035] Each hinge joint groove 31 includes a main groove 31 in the shape of an inward concave trapezoid;

[0036] The cross-section of each main groove 31 is an isosceles trapezoid with the width of the bottom greater than the width of the opening position;

[0037] Between the upper end of one side wall of each main groove 31 close to the upper surface of the corresponding upper slab beam 1 and the upper surface of the corresponding upper slab beam 1, there is an inclined surface 32;

[0038] After every two adjacent upper slab beams 1 are spliced, a thin film bottom layer 4 is provided between the side walls of the corresponding two main grooves 31 far from the upper surface of the upper slab beam 1;

[0039] Each thin film bottom layer 4 forms a hinge joint pouring cavity with the corresponding two main grooves 31 on both sides and two inclined surfaces 32;

[0040] UHPC high-performance concrete material is poured into each hinge joint pouring cavity to form a hinge joint.

[0041] The present invention aims at bridges where the bridge span direction is perpendicular to the road forward direction. Based on UHPC high-performance concrete materials, a slab-beam hinge joint structure and construction technology are proposed, aiming to replace the traditional expansion joint device, which can not only improve the driving smoothness, but also meet the temperature deformation in the longitudinal road direction and the normal use of the bridge, and can be applied to longer spans.

[0042] After every two adjacent upper slab-beams 1 are spliced, a thin film bottom formwork 4 is provided between the side walls on one side far from the upper surface of the upper slab-beam 1 in the corresponding two main grooves 31 to form a permanent formwork. The overall formwork is in a wedge-shaped structure with a larger bottom and a smaller top. Then, the UHPC high-performance concrete material is used to fill the hinge joint pouring cavity until it is full to form a hinge joint, which is used to restrain the shear deformation of the adjacent superstructures and make the deformation coordinated.

[0043] In some embodiments, a flexible asphalt cushion layer is provided at the bottom of each main groove 31.

[0044] In practical applications, the thickness of the flexible asphalt cushion layer is set according to the temperature deformation in the longitudinal road direction of the bridge. For example, for a slab-beam width of 4m and a temperature rise and fall of ±25°C, the deformation is about 1mm, then a flexible cushion with a thickness of 1mm is set.

[0045] In some embodiments, the distance between the adjacent sides of every two adjacent upper slab-beams 1 is more than 60 millimeters; the width of each hinge joint pouring cavity at the position on the upper surface of the corresponding two adjacent upper slab-beams 1 is more than 80 millimeters.

[0046] In some embodiments, an upper paving 5 formed of asphalt concrete is laid on the upper surfaces of all the upper slab-beams 1 and the corresponding hinge joints.

[0047] Finally, conventional asphalt concrete is laid to form the upper paving 5, and the road surface remains seamless to ensure driving comfort.

[0048] In some embodiments, the thin film bottom formwork 4 is made of steel.

[0049] The present invention also provides a construction method for the slab-beam hinge joint structure, including the following steps:

[0050] Step 1: Construct all the upper slab-beams 1;

[0051] Step 2: Lay the thin film bottom formwork 4;

[0052] Step 3: Lay a flexible asphalt cushion layer at the bottom of all the main grooves 31;

[0053] Step 4: Pour UHPC high-performance concrete material into the hinge joint pouring cavity;

[0054] Step 5: After the UHPC high-performance concrete material reaches the designed strength, pave the upper deck beam 1 and the asphalt concrete on the hinge joint to form the upper pavement 5.

[0055] In practical applications, after completing the above steps and the hinge joint construction, it is necessary to continue the construction of the remaining parts of the bridge.

[0056] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A plate-beam hinge joint structure, used for connecting the upper plate beam (1) of a bridge; characterized in that: The upper plate beam (1) comprises at least two pieces of upper plate beams (1) connected to each other at the sides; The sides of each of the two connected upper plate beams (1) are provided with facing hinge grooves (3) near the top. Each hinge groove (31) comprises a main groove (31) in the shape of an inwardly concave trapezoid; The cross section of each of the main grooves (31) is an isosceles trapezoid, with the width of the bottom being greater than the width of the opening; Each of the main grooves (31) has an inclined surface (32) between the upper end of a side wall close to the upper surface of the corresponding upper plate beam (1) and the upper surface of the corresponding upper plate beam (1); After each two connected upper plate beams (1) are spliced, a thin bottom membrane (4) is provided between the side walls of the corresponding two main grooves (31) away from the upper side of the upper plate beam (1); Each of the thin sheet bottom films (4) forms a hinged joint casting cavity with the corresponding two main grooves (31) located on both sides and the two inclined surfaces (32); UHPC high-performance concrete material is poured into each hinged joint casting cavity to form a hinged joint.

2. The plate beam hinge joint structure according to claim 1, characterized in that: A flexible asphalt cushion layer is provided at the bottom of each main groove (31).

3. The plate-beam hinge joint structure according to claim 1, characterized in that: The distance between the connecting sides of each two connected upper plate beams (1) is more than 60 mm; the width of each hinged joint casting cavity at the upper position of each two connected upper plate beams (1) is more than 80 mm.

4. The plate-beam hinge joint structure according to claim 1, characterized in that: All the upper plate beams (1) and the corresponding hinged joints are paved with an upper pavement (5) formed of asphalt concrete.

5. The plate-beam hinge joint structure according to claim 1, characterized in that: The thin sheet base film (4) is made of steel.

6. The construction method of the plate-beam hinge joint structure is characterized by: The steps include: Step 1: Construction of all upper slab beams (1); Step 2, laying the thin base film (4); Step 3, laying a flexible asphalt cushion layer at the bottom of all the main grooves (31); Step 4, pouring UHPC high-performance concrete material into the hinge joint casting cavity; Step 5: After the UHPC high-performance concrete material reaches the designed strength, the upper slab beam (1) and the upper pavement (5) formed by asphalt concrete on the hinged joint are spread.

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