Construction method of seamless expansion joints for bridges

Abstract

This invention relates to the technical field of bridge expansion joints, and discloses a construction method for seamless bridge expansion joints, including the following construction steps: 1) Chiseling and cleaning the construction site to form a gap to be filled; the gap to be filled includes the expansion joint and an elastic area; 2) Filling the expansion joint with joint filler and arranging padding strips in the expansion joint; 3) Laying a metal plate, the metal plate covering the expansion joint, the metal plate having fixing nails, the lower end of the fixing nails passing through the padding strips and inserted into the joint filler; 4) Arranging adjacent pavement layers at intervals to form an elastic area, filling the elastic area with an elastomer, the elastomer covering the metal plate; the fixing nails are fixed by the padding strips and joint filler, ensuring that the metal plate covers the expansion joint, ensuring the water-proof effect, while the design of the padding strips prevents the filler from leaking out of the expansion joint, and the design of the elastomer makes the pavement seamless, achieving the effects of shock absorption, noise reduction and water-proofing when vehicles pass over it.

Description

Technical Field

[0001] This invention relates to the technical field of bridge expansion joints, and more specifically, to a construction method for seamless bridge expansion joints. Background Technology

[0002] Bridge expansion joints are an essential component of bridge construction. Bridge spans are subject to deformation and displacement at the beam ends due to various factors, such as live loads, temperature and humidity changes, pier and abutment settlement, and concrete shrinkage. To ensure vehicles can travel smoothly on the bridge even with beam end displacement and deformation, expansion joints are installed at the beam ends, bridge deck beam ends, and abutment back walls.

[0003] In existing technologies, bridge expansion joints generally adopt the Maurer type. However, due to long-term use, the sealing strips age and become damaged. Rainwater can erode the beams and slabs, affecting the structural durability of the beams and slabs. Furthermore, there are problems such as sealing strip detachment and water seepage, which greatly reduces the service life of the expansion joints. At the same time, after long-term use, the concrete in the anchorage area cracks and breaks, causing road surface damage, affecting driving comfort, and easily causing vehicle bouncing and excessive noise. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for seamless bridge expansion joints, aiming to solve the problems in the prior art, such as short service life of bridge expansion joints, poor water prevention effect after aging and damage of sealing strips, and serious concrete damage at the expansion joint due to lack of long-term maintenance, resulting in loud noise and vehicle bouncing when vehicles pass by.

[0005] This invention is implemented as follows: a construction method for seamless expansion joints in bridges includes the following construction steps:

[0006] 1) Locate the construction site, chisel and clear the construction site to form a gap to be filled; the gap to be filled includes the expansion joint formed between adjacent bridge decks and the elastic area above the expansion joint;

[0007] 2) Fill the lower part of the expansion joint with sealant, the sealant filling the lower part of the expansion joint completely; arrange a padding strip on the upper part of the expansion joint, the padding strip extending along the length of the expansion joint, the padding strip pressing against the sealant;

[0008] 3) The bridge plate has a butt joint at its end, and an expansion joint is formed between the ends of adjacent butt joints. A metal plate is arranged on the butt joint, the metal plate covers the expansion joint, and both sides of the metal plate extend to the top of the adjacent butt joint.

[0009] The metal plate is provided with fixing nails extending toward the expansion joint, the upper end of the fixing nails abutting against the metal plate, and the lower end of the fixing nails passing through the padding strip and inserting into the joint filler;

[0010] 4) A pavement layer is laid on the top of the bridge plate, and the pavement layers on the top of adjacent bridge plates are arranged at intervals to form the elastic area. The elastic area is connected to the expansion joint, and the connecting section is located at the bottom of the elastic area. An elastic body is filled into the elastic area, and the elastic body covers the metal plate and fills the elastic area completely.

[0011] Optionally, in step 4), the elastomer is composed of binder BJ200 and aggregate with uniform particle size.

[0012] Optionally, the bottom of the fixing nail is pointed, and the padding strip is fixedly connected to the fixing nail.

[0013] Optionally, the top of the padding strip is spaced apart from the bottom of the metal plate.

[0014] Optionally, in step 3), the top of the expansion joint has a top opening, and the metal plate completely closes the top opening;

[0015] In step 4), the elastomer completely covers the top of the metal plate.

[0016] Optionally, in step 4), after filling the elastic region with elastomer, the top of the elastomer is compacted and leveled until the top of the elastomer is flat and the top of the elastomer is horizontally aligned with the top of the pavement layer.

[0017] Optionally, the bridge deck is formed by reinforcing steel and concrete casting; the pavement layer is composed of asphalt or cement and concrete.

[0018] Optionally, the mating section has a mating surface facing the expansion joint, and adjacent mating surfaces are spaced apart to form the expansion joint; the two sides of the padding strip abut against the mating surface, and the two sides of the padding strip have outwardly protruding deformable portions abut against the mating surface; the padding strip is elastic.

[0019] The width of the padding strip in its free state is greater than the width of the expansion joint; in step 2), the padding strip is pressed against the sealant using an adjustment tool, and the deformable part undergoes elastic deformation.

[0020] Optionally, a plurality of elastic rings are fitted on the outer periphery of the fixing nail, the elastic rings are located between the padding strip and the metal plate, and the plurality of elastic rings are arranged vertically at intervals; the inner periphery of the elastic ring is fixed on the outer periphery of the fixing nail, and a through hole is provided on the outer periphery of the elastic ring, the through hole passing through the elastic ring laterally to form an installation channel;

[0021] The elastic ring is provided with two mounting channels, which are symmetrically arranged on both sides of the fixing nail; a spring is embedded in the mounting channel, and the spring extends laterally along the extension direction of the mounting channel. The inner end of the spring is fixedly connected to the fixing nail, and the outer end of the spring is fixedly connected to an elastic post.

[0022] The inner end of the elastic column is inserted into the installation channel and fixedly connected to the outer end of the spring. The outer end of the elastic column extends horizontally outward to the outside of the elastic ring. The outer end of the elastic column has a flat outer end face, and the outer end face and the mating surface are in surface contact.

[0023] When the expansion joint contracts inward, the elastic column is pressed against and moves toward the fixing pin, the spring is compressed, the elastic ring is compressed, and the fixing pin is clamped and fixed.

[0024] Optionally, along the length of the fixing pin, the mounting channels on adjacent elastic rings are arranged in a circumferentially staggered manner.

[0025] Compared with existing technologies ， The construction method for seamless bridge expansion joints provided by this invention involves dismantling the original damaged expansion joint structure on the road, chiseling away the pavement layer according to a set size, and then proceeding with construction. Fixing nails are secured using padding strips and joint filler, ensuring the metal plate covers the expansion joint and guarantees water-proofing. The padding strip design also prevents filler leakage from the expansion joint. The elastomer design creates a seamless road surface, effectively reducing vibration and noise when vehicles pass over it, as well as preventing water seepage. Applied to highway maintenance, the overall construction operation is simple. The superior anti-seepage and elastomer design result in a long service life, and the absence of complex anchoring structures allows for rapid completion with short road closure times, avoiding increased traffic congestion. Attached Figure Description

[0026] Figure 1 This is a cross-sectional schematic diagram of the seamless expansion joint for bridges provided by the present invention;

[0027] Figure 2 This is a construction diagram of step 1) provided by the present invention;

[0028] Figure 3 This invention provides Figure 1 Enlarged view of point A in the middle;

[0029] Figure 4 This is a cross-sectional schematic diagram of the elastic ring provided by the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0032] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0033] Reference Figure 1-4 The image shows a preferred embodiment of the present invention.

[0034] The construction method for the seamless expansion joint 110 of a bridge provided by the present invention includes the following construction steps:

[0035] 1) Locate the construction site, chisel and clear the construction site to form a gap to be filled; the gap to be filled includes the expansion joint 110 formed between adjacent bridge plates 100 and the elastic area 50 located above the expansion joint 110.

[0036] 2) Fill the lower part of the expansion joint 110 with sealant 200, and fill the lower part of the expansion joint 110 with sealant 200; place a padding strip 300 on the upper part of the expansion joint 110, the padding strip 300 extends along the length of the expansion joint 110, and the padding strip 300 presses against the sealant 200.

[0037] 3) The bridge plate 100 has a butt joint section at its end, and an expansion joint 110 is formed between the ends of adjacent butt joint sections. A metal plate 400 is arranged on the butt joint section, covering the expansion joint 110, and the two sides of the metal plate 400 extend to the top of the adjacent butt joint section respectively. A fixing nail 410 extending toward the expansion joint 110 is provided on the metal plate 400. The upper end of the fixing nail 410 is abutted on the metal plate 400, and the lower end of the fixing nail 410 passes through the padding strip 300 and is inserted into the sealant 200.

[0038] 4) A pavement layer 120 is laid on the top of the bridge plate 100. The pavement layers 120 on the top of adjacent bridge plates 100 are arranged at intervals to form an elastic area 50. The elastic area 50 is connected to the expansion joint 110, and the connecting section is located at the bottom of the elastic area 50. An elastic body 500 is filled into the elastic area 50. The elastic body 500 covers the top of the metal plate 400 and fills the elastic area 50 completely.

[0039] The construction method for the seamless expansion joint 110 of the bridge described above involves dismantling the original damaged expansion joint 110 structure on the road, chiseling away the pavement layer 120 according to the set dimensions to obtain the gap to be filled, and then proceeding with the construction. The design of the elastomer 500 serves to reduce vibration and noise when vehicles pass over it, as well as prevent water seepage. The fixing nails 410 are secured using the padding strip 300 and the joint filler 200, ensuring that the metal plate 400 covers the expansion joint 110, guaranteeing the water-proof effect. Simultaneously, the design of the padding strip 300 prevents the filler from leaking out of the expansion joint 110. Applied to highway maintenance, the overall construction operation is simple, requiring no complex anchoring structures, and can be completed quickly with short road closure times, avoiding increased traffic pressure.

[0040] Specifically, in step 4), the elastomer 500 is composed of binder BJ200 and aggregates with uniform particle size. Thus, binder BJ200 acts as the adhesive for the elastic modifier, bonding the aggregates to not only prevent water seepage but also forming an elastomer 500 with good elasticity, effectively reducing vehicle sway and noise reduction when vehicles pass over it.

[0041] The bottom of the fixing nail 410 is pointed, and the padding strip 300 is fixedly connected to the fixing nail 410. This makes it easy for the fixing nail 410 to pass through the padding strip 300, while effectively using the padding strip 300 to fix the fixing nail 410, making the overall structure more compact and preventing the metal plate 400 from shifting. At the same time, the padding strip 300 is also fixed, preventing the sealant 200 from filling upwards when the expansion joint 110 contracts, and promoting the sealant 200 to pile up firmly towards the gap.

[0042] Specifically, the top of the padding strip 300 and the bottom of the metal plate 400 are spaced apart. Space is provided for deformation of the padding strip 300 and for the accumulation of the sealant 200.

[0043] In step 3), the top of the expansion joint 110 has a top opening, which is completely sealed by the metal plate 400. This prevents liquid from entering the expansion joint 110.

[0044] In step 4), the elastomer 500 completely covers the top of the metal plate 400. This prevents liquid from entering the elastic region 50.

[0045] In step 4), after filling the elastic region 50 with elastomer 500, the top of the elastomer 500 is compacted and leveled until the top of the elastomer 500 is flat and horizontally aligned with the top of the pavement layer 120. This prevents vehicles from bouncing over when passing through.

[0046] Specifically, the bridge deck 100 is formed by reinforcing steel and concrete; the pavement layer 120 is composed of asphalt or cement and concrete. This ensures the strength of the bridge structure and that the pavement layer 120 is suitable for long-term vehicle traffic.

[0047] In this embodiment, the mating section has a mating surface facing the expansion joint 110, and adjacent mating surfaces are arranged at intervals to form the expansion joint 110; the two sides of the padding strip 300 abut against the mating surface respectively, and the two sides of the padding strip 300 have outwardly protruding deformable portions 301, which abut against the mating surface, and the padding strip 300 is elastic.

[0048] The width of the padding strip 300 in its free state is greater than the width of the expansion joint 110. In step 2), the padding strip 300 is pressed against the sealant 200 using an adjustment tool, and the deformable part 301 deforms elastically. In this way, by compressing and deforming the padding strip 300, the sealing effect is ensured, and the sealant 200 is prevented from leaking out of the expansion joint 110. When the expansion joint 110 is large, the beam does not compress the padding strip 300, the sealant 200 accumulates downwards, the padding strip 300 is fixed to the fixing nail 410, and the padding strip 300 may be suspended.

[0049] In this embodiment, a plurality of elastic rings 420 are sleeved on the outer periphery of the fixing nail 410. The elastic rings 420 are located between the padding strip 300 and the metal plate 400, and the plurality of elastic rings 420 are arranged vertically at intervals. The inner periphery of the elastic rings 420 is fixed on the outer periphery of the fixing nail 410. The outer periphery of the elastic rings 420 is provided with through holes, which transversely penetrate the elastic rings 420 to form an installation channel 421.

[0050] The elastic ring is provided with two mounting channels 421, which are symmetrically arranged on both sides of the fixing pin 410. A spring 430 is embedded in the mounting channel 421. The spring 430 extends laterally along the extension direction of the mounting channel 421. The inner end of the spring 430 is fixedly connected to the fixing pin 410, and the outer end of the spring 430 is fixedly connected to an elastic post 440. The inner end of the elastic post 440 is inserted into the mounting channel 421 and fixedly connected to the outer end of the spring 430. The outer end of the elastic post 440 extends horizontally outward to the outside of the elastic ring 420. The outer end of the elastic post 440 has a flat outer end face, and the outer end face is in surface contact with the mating surface.

[0051] When the expansion joint 110 contracts inward, the elastic column 440 is pressed against and moves towards the fixing nail 410, the spring 430 is compressed, the elastic ring 420 is compressed, and the fixing nail 410 is clamped and fixed. Thus, after the expansion joint 110 contracts, the friction between the beam and the metal plate 400, as well as the upward force of the filler 200 below, may cause the fixing nail 410 to shift. The elastic column 440 effectively clamps and fixes the fixing nail 410. When the expansion joint 110 contracts to a smaller area, the beam will press against both sides of the outer periphery of the elastic ring 420, causing the inner periphery of the elastic ring 420 to clamp the fixing nail 410, thus also clamping and fixing it and preventing the fixing nail 410 from shifting.

[0052] Along the length of the fixing pin 410, the mounting channels 421 on adjacent elastic rings 420 are arranged in a circumferentially staggered manner. In this way, from the top view, the included angle between the mounting channels 421 on adjacent elastic rings 420 is less than 15 degrees, realizing the fixing pin 410 is fixedly clamped in multiple directions.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for seamless expansion joints in bridges, characterized in that, The construction steps include the following: 1) Locate the construction site, chisel and clear the construction site to form a gap to be filled; the gap to be filled includes the expansion joint formed between adjacent bridge decks and the elastic area above the expansion joint; 2) Fill the lower part of the expansion joint with sealant, the sealant filling the lower part of the expansion joint completely; A padding strip is arranged on the upper part of the expansion joint, the padding strip extends along the length of the expansion joint, and the padding strip presses against the joint filler; 3) The bridge plate has a butt joint at one end, and an expansion joint is formed between the ends of adjacent butt joints. A metal plate is arranged on the butt joint, the metal plate covers the expansion joint, and both sides of the metal plate extend to the top of the adjacent butt joint. The metal plate is provided with fixing nails extending toward the expansion joint, the upper end of the fixing nails abutting against the metal plate, and the lower end of the fixing nails passing through the padding strip and inserting into the joint filler; 4) A pavement layer is laid on the top of the bridge plate, and the pavement layers on the top of adjacent bridge plates are arranged at intervals to form the elastic area. The elastic area is connected to the expansion joint, and the butt joint is located at the bottom of the elastic area. An elastic body with elasticity is filled into the elastic area, and the elastic body covers the top of the metal plate and fills the elastic area completely. The connecting section has a connecting surface facing the expansion joint, and adjacent connecting surfaces are spaced apart to form the expansion joint; the two sides of the padding strip abut against the connecting surface, and the two sides of the padding strip have outwardly protruding deformable portions abut against the connecting surface; the padding strip is elastic. The width of the padding strip in its free state is greater than the width of the expansion joint; in construction step 2), the padding strip is pressed against the joint filler using an adjustment tool, and the deformable part undergoes elastic deformation; Multiple elastic rings are fitted around the outer periphery of the fixing nail. The elastic rings are located between the padding strip and the metal plate, and the multiple elastic rings are arranged vertically at intervals. The inner periphery of the elastic ring is fixed to the outer periphery of the fixing nail. A through hole is provided on the outer periphery of the elastic ring. The through hole passes through the elastic ring laterally to form an installation channel. The elastic ring is provided with two mounting channels, which are symmetrically arranged on both sides of the fixing nail; a spring is embedded in the mounting channel, and the spring extends laterally along the extension direction of the mounting channel. The inner end of the spring is fixedly connected to the fixing nail, and the outer end of the spring is fixedly connected to an elastic post. The inner end of the elastic column is inserted into the installation channel and fixedly connected to the outer end of the spring. The outer end of the elastic column extends horizontally outward to the outside of the elastic ring. The outer end of the elastic column has a flat outer end face, and the outer end face and the mating surface are in surface contact. When the expansion joint contracts inward, the elastic column is pressed against and moves toward the fixing pin, the spring is compressed, the elastic ring is compressed, and the fixing pin is clamped and fixed.

2. The construction method for seamless bridge expansion joints as described in claim 1, characterized in that, In construction step 4), the elastomer is composed of adhesive BJ200 and aggregate with uniform particle size.

3. The construction method for seamless bridge expansion joints as described in claim 1, characterized in that, The bottom of the fixing nail is pointed, and the padding strip is fixedly connected to the fixing nail.

4. The construction method for seamless bridge expansion joints as described in claim 3, characterized in that, The top of the padding strip is spaced apart from the bottom of the metal plate.

5. The construction method for seamless bridge expansion joints as described in claim 1, characterized in that, In construction step 3), the top of the expansion joint has a top opening, and the metal plate completely closes the top opening; In construction step 4), the elastomer completely covers the top of the metal plate.

6. The construction method for seamless bridge expansion joints as described in claim 1, characterized in that, In construction step 4), after filling the elastic area with elastomer, the top of the elastomer is compacted and leveled until the top of the elastomer is flat and the top of the elastomer is horizontally aligned with the top of the pavement layer.

7. The construction method for seamless bridge expansion joints as described in claim 1, characterized in that, The bridge deck is formed by reinforcing steel and concrete; the pavement layer is composed of asphalt or cement and concrete.

8. The construction method for seamless bridge expansion joints as described in any one of claims 1 to 7, characterized in that, Along the length of the fixing pin, the mounting channels on adjacent elastic rings are arranged in a circumferentially staggered manner.

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