Anti-cracking expansion joint protection belt in cold region

Abstract

The utility model provides an anti-cracking expansion joint protection belt in a cold region, and belongs to the technical field of bridge engineering construction. The problems that in the operation process of an existing expansion joint protection belt, temperature shrinkage cracks are caused due to the temperature difference in four seasons, meanwhile, the expansion joint protection belt cracks and the concrete surface peels off are caused under the action of a snow melting agent, freezing and thawing circulation and the like, and the durability of the protection belt and the driving comfort are affected are solved. The protective belt comprises a protective belt body, the protective belt body is arranged on main beams on the two sides of the expansion joint, the protective belt body comprises a protective belt concrete layer and constructional steel bars, the protective belt concrete layer is connected with the main beams, and the sides, away from the expansion joint, of the constructional steel bars are connected with extending steel bars. The constructional steel bars and the extending steel bars are embedded in the protective belt concrete layer, and a plurality of kerfs are evenly formed in the top of the protective belt concrete layer at intervals in the length direction of the protective belt concrete layer. The expansion joint protection belt is mainly used.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering construction, in particular to a cold region anti-cracking expansion joint protection belt. Background Art

[0002] With the rapid development of new materials and technologies for municipal and highway bridges in my country, bridge construction has entered a stage of high-quality development. The unique environment of the northern cold regions, where the maximum temperature difference between day and night reaches 60 degrees Celsius throughout the year, is a major characteristic of these regions and a test of the durability of bridge concrete structures.

[0003] At present, a common problem faced during the construction and operation and maintenance of expansion joint protection strips in the northern cold regions is that the protection strips cause shrinkage cracks due to the temperature difference between the four seasons during operation. At the same time, the expansion joint protection strips are cracked and the concrete surface is peeled off under the action of snow melting agents and freeze-thaw cycles, affecting the durability of the protection strips and driving comfort. This is also the main problem faced by expansion joint protection strips in the northern cold regions, and solving this problem is of vital importance. Utility Model Content

[0004] In view of this, the utility model aims to propose a cold-region anti-cracking expansion joint protection belt to solve the problem that the existing expansion joint protection belt causes thermal shrinkage cracks due to the temperature difference between the four seasons during operation, and at the same time, the expansion joint protection belt cracks and concrete surface peeling due to the effects of snow melting agents and freeze-thaw cycles, which affect the durability of the protection belt and driving comfort.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a cold-region anti-cracking expansion joint protection strip, which includes a protection strip body, which is arranged on the main beams on both sides of the expansion joint, and the protection strip body includes a protection strip concrete layer and structural steel bars, the protection strip concrete layer is connected to the main beam, and the side of the structural steel bars away from the expansion joint is connected to the extension steel bars, and the structural steel bars and the extension steel bars are both embedded in the protection strip concrete layer, and a plurality of slits are evenly spaced on the top of the protection strip concrete layer along the length direction of the protection strip concrete layer, and the slits are opened along the width direction of the protection strip concrete layer.

[0006] Furthermore, the main beams on both sides of the expansion joint are provided with protection belt grooves, and the protection belt body is arranged in the protection belt grooves.

[0007] Furthermore, the protection belt body and the main beam are connected by embedded steel bars.

[0008] Furthermore, the width of the slit is 5 mm and the depth is 40 mm.

[0009] Furthermore, an expansion joint assembly is provided between the tops of the protective belt bodies on both sides of the expansion joint, and the expansion joint assembly includes a span plate, a fixed comb plate, a water-stop structure and a multi-directional displacement hinge. The span plate and the fixed comb plate are respectively connected to the protective belt concrete layers on both sides of the expansion joint, one end of the span plate is connected to the top of the protective belt concrete layer on one side of the expansion joint, and the other end of the span plate extends to the top of the protective belt concrete layer on the other side of the expansion joint and is spaced and coordinated with the comb teeth of the fixed comb plate, and one end of the span plate is connected to the multi-directional displacement hinge.

[0010] Furthermore, the water-stop structure is arranged in the expansion joint.

[0011] Furthermore, the seam spanning plates and the fixed comb plates are connected to the concrete layer of the protective belt through bolted steel bars.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. This utility model provides a cold-region anti-cracking expansion joint protection strip. By connecting extension steel bars to one side of the structural steel bars, the expansion joint protection strip can be integrated with the bridge deck concrete, greatly improving the integrity of the concrete in the protection strip.

[0014] 2. The utility model provides a cold-region anti-cracking expansion joint protection belt, which effectively eliminates the temperature shrinkage cracks of the concrete in the protection belt by setting slits in the concrete layer of the protection belt, improves the durability of the concrete in this area, and greatly extends the service life of the protection belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a structural schematic diagram of a cold region anti-cracking expansion joint protection belt according to the utility model;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of a cold region anti-cracking expansion joint protection belt described in the utility model.

[0018] 1- protective belt concrete layer, 2- structural reinforcement, 3- extension reinforcement, 4- cut joint, 5- expansion joint, 6- main beam, 7- span plate, 8- fixed comb plate, 9- bolt reinforcement, 10- multi-directional displacement hinge, 11- water-stop structure, 12- embedded reinforcement. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0020] See also Figure 1-2 The present embodiment describes a cold region anti-cracking expansion joint protection strip, which includes a protection strip body, the protection strip body is arranged on the main beam 6 on both sides of the expansion joint 5, the protection strip body includes a protection strip concrete layer 1 and structural steel bars 2, the protection strip concrete layer 1 is connected to the main beam 6, the structural steel bars 2 are connected to the side away from the expansion joint 5 with the extension steel bars 3, the structural steel bars 2 and the extension steel bars 3 are both embedded in the protection strip concrete layer 1, the top of the protection strip concrete layer 1 is provided with a plurality of slits 4 evenly spaced along the length direction of the protection strip concrete layer 1, the slits 4 are opened along the width direction of the protection strip concrete layer 1, this embodiment ensures that the expansion joint protection strip can form a whole with the bridge deck pavement concrete by connecting the extension steel bars 3 on one side of the structural steel bars 2, thereby greatly improving the integrity of the protection strip concrete layer 1, and by setting the slits 4 in the protection strip concrete layer 1, the temperature shrinkage cracks of the protection strip concrete 1 are effectively eliminated, the durability of the concrete in this part is improved, and the service life of the protection strip is greatly extended.

[0021] The structures of the structural reinforcement 2 and the extension reinforcement 3 in this embodiment are both reinforcement mesh structures.

[0022] In this embodiment, the main beams 6 on both sides of the expansion joint 5 are provided with protection belt grooves, and the protection belt body is arranged in the protection belt grooves. Before opening the protection belt grooves, it is necessary to measure and lay out the lines, the expansion joint installation width, the protection belt edge line, etc. to reasonably determine the boundary position to ensure that the two sides of the protection belt are equal in width, and the width range is between 300mm and 350mm. After cutting the grooves, clean up the excess concrete to ensure that the thickness of the expansion joint protection belt is 180mm or 200mm, exposing the bridge deck paving steel mesh, so as to facilitate subsequent welding with the structural steel bars 2 and the extension steel bars 3 of the protection belt body to form a whole.

[0023] In this embodiment, the protection belt body and the main beam 6 are connected by embedded steel bars 12. The number and spacing of the embedded steel bars 12 can be adaptively adjusted according to actual conditions and needs.

[0024] In this embodiment, the slits 4 are 5 mm wide and 40 mm deep, and a flexible sealing material is poured into the slits 4. Considering the year-round temperature differences in northern cold regions and the characteristics of urban viaducts and highway bridges, which typically have two, three, or four lanes in one direction, and even five or six lanes in widened sections of urban viaducts, lane widths are typically 3.50 m or 3.75 m. After comparing lane widths and wheel track locations, the protective strips are cut every 4 m, with slits of 5 mm wide and 40 mm deep, starting from the center crash barrier. The cutting time is controlled within 24 hours.

[0025] In this embodiment, an expansion joint assembly is provided between the tops of the protective belt bodies on both sides of the expansion joint 5, and the expansion joint assembly includes a span plate 7, a fixed comb plate 8, a water-stop structure 11 and a multi-directional displacement hinge 10. The span plate 7 and the fixed comb plate 8 are respectively connected to the protective belt concrete layers 1 on both sides of the expansion joint 5, one end of the span plate 7 is connected to the top of the protective belt concrete layer 1 on one side of the expansion joint 5, and the other end of the span plate 7 extends to the top of the protective belt concrete layer 1 on the other side of the expansion joint 5 and is spaced and matched with the comb teeth of the fixed comb plate 8. One end of the span plate 7 is connected to multiple Toward the displacement hinge 10, the cross-seam plate 7 connects the structures on both sides at the expansion joint 5, so that the road surface or bridge and other structures maintain a certain continuity at the expansion joint 5 position, avoiding the obvious discontinuity due to the existence of the expansion joint 5, and ensuring the stability of vehicle driving. When the structure undergoes expansion and contraction deformation, the cross-seam plate 7 can move and adjust to a certain extent with the deformation, realizing the transition between the structures on both sides, reducing the bumps and impacts caused by the expansion joint, and the cross-seam plate 7 plays the role of dispersing the load, and the cross-seam plate 7 usually has a certain sealing property, which can prevent rainwater, debris, etc. from entering the expansion joint.

[0026] The multi-directional displacement hinge 10 described in this embodiment can adapt to horizontal expansion and contraction and shear deformation, while also being able to withstand a certain degree of vertical displacement and rotation, and can better adapt to changes in different structural forms and engineering environments. Its structure is existing technology and will not be elaborated here.

[0027] The water-stop structure 11 in this embodiment is disposed in the expansion joint 5 , and is used for waterproofing and sealing the expansion joint 5 .

[0028] In this embodiment, the cross-seam plate 7 and the fixed comb plate 8 are connected to the protective strip concrete layer 1 through bolt steel bars 9, and the bolt steel bars 9 are used to connect and fix the cross-seam plate 7 and the fixed comb plate 8 to the protective strip concrete layer 1.

[0029] The construction process steps of the cold region anti-cracking expansion joint protection belt described in this embodiment are as follows:

[0030] Step 1: Construction preparation: The construction layout preparation stage mainly involves preparing small machines, bridges, steel bars, etc.

[0031] Step 2: Grooving: Before opening the protection strip groove, it is necessary to measure and lay out the lines, the installation width of the expansion joint, the edge line of the protection strip, and other aspects to reasonably determine the boundary position, ensuring that the width of both sides of the protection strip is equal, ranging from 300mm to 350mm. After cutting the groove, clean up the excess concrete. Ensure that the thickness of the expansion joint protection strip is 180mm or 200mm, exposing the bridge deck pavement steel mesh, so that it is easy to weld it to the structural steel bars 2 and extension steel bars 3 of the protection strip body to form a whole;

[0032] Step 3: Pre-embedded steel bar installation: Before installing the pre-embedded steel bars, the spacing and number of steel bars should be adjusted, and the pre-embedded steel bars should be firmly fixed to ensure the length of the weld;

[0033] Step 4: Installation of structural reinforcement 2 and extension reinforcement 3: The structural reinforcement 2 and extension reinforcement 3 at the protection strip should be fixed to the steel mesh of the bridge deck. At the same time, special attention should be paid to the net protection layer of the mesh on the structural reinforcement 2 and extension reinforcement 3 to be 50mm;

[0034] Step 5: Concrete pouring and installation of expansion joint assembly;

[0035] Step 6: After the concrete has finally set, cover it with geotextile and sprinkle water for curing;

[0036] Step 7: Cutting and grouting: Use a handheld cutter to cut the joints between 12 and 24 hours after pouring. The cut width is 5mm and the depth is 40mm. The purpose is to eliminate thermal shrinkage cracks in the concrete protection zone and improve the durability of the concrete in this area. Finally, grout the flexible sealing material.

[0037] In the present embodiment, the selection of concrete pouring time should be selected to carry out pouring construction in the evening or at night. When the northern cold region enters June to the end of August, the suitable pouring time during this period is the time with the lowest temperature in the day.

[0038] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. These embodiments do not exhaust all details, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A cold region anti-cracking expansion joint protection belt, characterized by: The invention comprises a protective belt body, which is arranged on the main beam (6) on both sides of the expansion joint (5). The protective belt body comprises a protective belt concrete layer (1) and structural steel bars (2). The protective belt concrete layer (1) is connected to the main beam (6). The side of the structural steel bars (2) away from the expansion joint (5) is connected to an extension steel bar (3). The structural steel bars (2) and the extension steel bars (3) are both embedded in the protective belt concrete layer (1). A plurality of slits (4) are evenly spaced at intervals on the top of the protective belt concrete layer (1) along the length direction of the protective belt concrete layer (1). The slits (4) are opened along the width direction of the protective belt concrete layer (1).

2. The cold region anti-cracking expansion joint protection strip according to claim 1, characterized in that: The main beams (6) on both sides of the expansion joint (5) are provided with protection belt grooves, and the protection belt body is arranged in the protection belt grooves.

3. The cold region anti-cracking expansion joint protection strip according to claim 1, characterized in that: The protective belt body is connected to the main beam (6) via pre-buried steel bars (12).

4. The cold region anti-cracking expansion joint protection strip according to claim 1, characterized in that: The width of the slit (4) is 5 mm and the depth is 40 mm.

5. The cold region anti-cracking expansion joint protection strip according to claim 1, characterized in that: An expansion joint assembly is provided between the tops of the protective belt bodies on both sides of the expansion joint (5), and the expansion joint assembly includes a cross-joint plate (7), a fixed comb plate (8), a water-stop structure (11) and a multi-directional displacement hinge (10). The cross-joint plate (7) and the fixed comb plate (8) are respectively connected to the protective belt concrete layers (1) on both sides of the expansion joint (5), one end of the cross-joint plate (7) is connected to the top of the protective belt concrete layer (1) on one side of the expansion joint (5), and the other end of the cross-joint plate (7) extends to the top of the protective belt concrete layer (1) on the other side of the expansion joint (5) and is spaced and matched with the comb teeth of the fixed comb plate (8), and one end of the cross-joint plate (7) is connected to the multi-directional displacement hinge (10).

6. The cold region anti-cracking expansion joint protection strip according to claim 5, characterized in that: The water-stop structure (11) is arranged in the expansion joint (5).

7. The cold region anti-cracking expansion joint protection strip according to claim 5, characterized in that: The seam spanning plate (7) and the fixed comb plate (8) are both connected to the protective belt concrete layer (1) via bolted steel bars (9).

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