A new type of bridge seamless expansion device with beam end filling

Abstract

The present invention provides a beam-end-filled bridge seamless expansion device, comprising an elastic material layer cushion (3) laid on the top surface of the abutment and located at the bottom of the gap between the main beam and the back wall, an elastic filling layer (4) arranged along the wall surface of the back wall, and a cement-based grouting material layer (1) arranged along the end surface of the beam, wherein the elastic filling layer (4) and the cement-based grouting material layer (1) are bonded together, and the thickness of the elastic filling layer (4) is 8 mm. The present invention can effectively adjust the gap between the beam end and the back wall through the improved beam seamless expansion device, ensure the expansion and contraction deformation of the main beam, facilitate the rigidity connection and transition between the main beam and the back wall, and reduce the impact effect of vehicles running on the bridge deck on the main beam. The device of the present invention does not need to set a cross-seam steel plate, and can effectively avoid the occurrence of cracking, damage and collapse of the expansion joint.

Description

[Technical field]

[0001] The invention belongs to the technical field of bridge expansion devices, and in particular relates to a novel bridge seamless expansion device based on beam end filling, which is suitable for small-span bridge structures of expressways, local highways and urban roads. [Background technology]

[0002] The bridge expansion device is an important part of the bridge deck system. Its main function is to adapt to the deformation of the bridge under the action of temperature load, concrete shrinkage creep and vehicle load, so as to ensure the safety of the bridge structure and the safety and comfort of vehicles on the bridge. At the same time, the bridge expansion device also has a waterproof function.

[0003] Seamless expansion joints are widely used in small-span bridge structures in my country. Their common general structures include: Figure 1 As shown in the figure, the main features of this type of expansion joint are: simple structure, convenient and flexible construction, high flatness, good comfort, high low-temperature flexibility and high high-temperature stability. Figure 1 It is very common for seamless expansion joint bridges to crack and break during operation. Cracks and damage will directly lead to a sharp decline or even failure of their waterproof function, causing problems such as abutment leakage, concrete rust and expansion, and bearing aging, seriously affecting the durability of the beams, bearings, and lower structures below the expansion joints.

[0004] The main reasons for the frequent cracking and damage of seamless expansion joints of bridges with this type of conventional structure are: deformation of the span steel plate: the span steel plate at the end of the beam is mainly set to achieve the rigid connection transition from the beam end to the back wall, but there is no quantitative reference standard for the selection of the plane size and thickness of the steel plate, which is often determined by the design or construction personnel themselves, with a certain degree of subjectivity and arbitrariness. During normal use, due to the impact of frequent driving of vehicles on the bridge deck, the deformation and warping of the span steel plate are inevitable, which in turn causes the deformation and warping of the elastic-plastic material of the notch, resulting in cracking and damage of the seamless expansion joint; beam end gap defect: when the beam end gap is too large, the span steel plate cannot achieve rigid connection; at the same time, in the process of renovating the seamless expansion joint of the bridge, it is found that the end of the beam body is usually rough and uneven, and the beam end gap is of different sizes. In the later use, cracking and collapse of the seamless expansion joint will also be difficult to avoid.

[0005] When the cracking and damage are minor, it is necessary to take measures such as crack injection and local repair to repair them; while for seamless expansion joints with more serious damage, they often need to be removed and replaced with new ones. This type of repair measure has a greater impact on the existing traffic on the bridge deck and requires a high investment in maintenance and repair costs.

[0006] To sum up, in order to avoid the drawbacks or shortcomings of the conventional seamless expansion device of the bridge, it is urgent to invent a seamless expansion device of the bridge with a new structure under the premise of improving the use function, ensuring the construction quality and improving the convenience of construction. [Summary of the invention]

[0007] The purpose of the present invention is to overcome the defects of the prior art. According to two situations: no modification of the bridge deck pavement and overall modification of the bridge deck pavement, a new beam end filling bridge seamless expansion device with better applicability is proposed. The device has many characteristics such as convenient construction, long service life, easy maintenance and good economic benefits.

[0008] The beam-end-filled bridge seamless expansion device includes an elastic material layer cushion layer 3 laid on the top surface of the abutment and located at the bottom of the gap between the main beam and the back wall, an elastic filling layer 4 arranged along the back wall surface, and a cement-based grouting layer 1 arranged along the end surface of the beam. The elastic filling layer 4 is bonded to the cement-based grouting layer 1, and the thickness of the elastic filling layer 4 is 8 mm.

[0009] In the present invention, the significance of limiting the thickness of the elastic filling layer 4 is to better achieve the connection of the beam end rigidity under the premise of satisfying the normal expansion and contraction of the main beam. If it is less than 8mm, the beam end may be stuck when the ambient temperature rises. If it is greater than 8mm, the width of the expansion joint may be further widened when the ambient temperature drops, resulting in damage to the lower expansion joint for automobile load.

[0010] According to a preferred embodiment, a steel mesh 2 is arranged in the cement-based grouting material layer 1 .

[0011] In order to ensure the bonding strength, the thickness of the cement-based grouting material layer 1 is preferably ≥ 2 cm.

[0012] In the present invention, the elastic material layer cushion 3 is made of a mixture of high-viscosity and high-elasticity modified asphalt and fillers. The advantage of this choice is that the material has high viscoelasticity, good high and low temperature stability, can be stretched and compressed, and can adapt to various deformations of bridge expansion and contraction.

[0013] In the present invention, the high-viscosity and high-elasticity modified asphalt has the characteristics of high dynamic viscosity, high softening point, strong elastic recovery ability, high viscosity and toughness, and aging resistance. The high-viscosity and high-elasticity modified asphalt is a product that can be purchased on the market, such as the high-viscosity and high-elasticity modified asphalt product produced and sold by Zhixing Liangzhi Industrial Co., Ltd.

[0014] In the present invention, the filler may be mineral powder, rubber particles, fly ash, etc., and its purpose is to fill the gaps and form mortar together with asphalt.

[0015] Generally, the weight ratio of the high-viscosity and high-elastic modified asphalt used as the elastic material layer cushion 3 to the filler is 1:1.5 to 1:3. Alternatively, those skilled in the art may also use other appropriate materials according to performance requirements under the guidance of existing technologies.

[0016] The elastic filling layer 4 is made of a mixture of high-viscosity and high-elasticity modified asphalt and filler. The advantage of this choice is that the material has high viscoelasticity, good high and low temperature stability, can be stretched and compressed, and can adapt to various deformations of bridge expansion and contraction.

[0017] The weight ratio of the high-viscosity and high-elastic modified asphalt used as the elastic filling layer 4 to the filler is 1:1.5 to 1:3. Alternatively, those skilled in the art may also use other appropriate materials based on performance requirements and under the guidance of existing technologies.

[0018] The high-viscosity and high-elastic modified asphalt and filler used in the elastic material layer cushion 3 and the elastic filling layer 4 and their usage ratio may be the same or different, and those skilled in the art may also make appropriate selections based on performance requirements.

[0019] The present invention provides a method for installing the above-mentioned beam end filling type bridge seamless expansion device in the overall reconstruction of the bridge deck pavement, comprising the following steps:

[0020] (1a) Chiseling off the bridge deck asphalt 11 and the integrated concrete layer 12;

[0021] (1b) pouring a thin layer of elastic material on the top surface of the abutment and at the bottom of the gap between the main beam and the back wall to construct an elastic material layer cushion 3; this step can ensure that the main beam can be normally extended and retracted during the subsequent use of the telescopic device;

[0022] (1c) a foam plastic plate 7 arranged along the back wall, wherein the thickness of the foam plastic plate 7 is about 8 mm;

[0023] (1d) pouring cement-based grouting material between the foam plastic board 7 and the beam end surface 13 to construct a cement-based grouting material layer 1;

[0024] (1e) After the poured cement-based grouting material reaches the designed strength, pouring construction of the bridge integrated concrete layer 12 is carried out;

[0025] (1f) removing the foam plastic board 7 of step 3, cleaning it and pouring the elastic filling material at the beam end to construct the elastic filling layer 4;

[0026] (1g) Paving asphalt concrete on the entire bridge deck;

[0027] (1h) Cutting and filling the asphalt pavement constructed in step (1g).

[0028] According to a preferred embodiment, in step (1d), a steel mesh 2 is arranged between the foam plastic board 7 and the beam end surface 13, and then a cement-based grouting material is poured.

[0029] In step (1c) and step (1d), in view of the large gap or uneven gap size at the beam end, the present invention uses a method of pouring cement-based grouting material on the beam end side to adjust the distance between the beam end and the back wall, so that the width of the gap at the beam end after adjustment is about 8 mm. At the same time, in order to ensure the strength of the grouting material itself and the effective bonding with the beam end concrete, the thickness of the cement-based grouting material layer poured on site should be not less than 2 cm.

[0030] In step (1h), the asphalt pavement seam cutting and seam filling refers to cutting the asphalt concrete pavement vertically at a position about 1m away from the beam end gap after the asphalt concrete paving construction is completed, and then filling the seam with elastic material. This process belongs to the prior art in this field and is a conventional construction method mastered by those skilled in the art, and will not be described in detail.

[0031] In view of the situation where the bridge deck pavement is not modified, the present invention also provides an installation method for the above-mentioned beam end filling bridge seamless expansion device pavement without modification, and the method comprises the following steps:

[0032] (1a) According to the width of the bridge notch, determine the position of the seamless expansion joint notch on the bridge deck;

[0033] (2b) cutting the seamless expansion joint notch along the line according to the position of step (1a);

[0034] (2c) pouring a thin layer of elastic material on the top surface of the abutment and at the bottom of the gap between the main beam and the back wall to construct an elastic material layer cushion 3;

[0035] (2d) a foam plastic plate 7 arranged along the back wall, wherein the thickness of the foam plastic plate 7 is about 8 mm;

[0036] (2e) pouring cement-based grouting material between the foam plastic board 7 and the beam end surface 13 to construct a cement-based grouting material layer 1;

[0037] (2f) removing the foam plastic board 7 of step 3, cleaning it and pouring the elastic filling material at the beam end to construct the elastic filling layer 4;

[0038] (2g) Apply the adhesive matching the elastic filling material evenly to the bottom and both sides of the groove;

[0039] (2h) Then evenly spread asphalt binder on the bottom of the groove, preheat it with a blowtorch, and then apply a layer of binder sol on the side of the groove;

[0040] (2i) Spread elastic filler in the groove of seamless expansion joint;

[0041] (2j) Repair expansion joints and bridge decks.

[0042] Similarly, in step (2d) and step (2e), in view of the large gap or uneven gap size at the beam end, the present invention uses a method of pouring cement-based grouting material on the beam end side to adjust the distance between the beam end and the back wall, so that the gap width of the beam end after adjustment is about 8 mm. At the same time, in order to ensure the strength of the grouting material itself and the effective bonding with the beam end concrete, the thickness of the cement-based grouting material layer poured on site should be not less than 2 cm.

[0043] According to a preferred embodiment, in step (2e), a steel mesh 2 is arranged between the foam plastic board 7 and the beam end surface 13, and then a cement-based grouting material is poured.

[0044] The beam end elastic filling material poured in step (2f) is a mixture of high-viscosity and high-elasticity modified asphalt and filler. Optionally, the weight ratio of high-viscosity and high-elasticity modified asphalt to filler is 1:1.5 to 1:3, or, those skilled in the art may also use other appropriate materials according to the performance requirements of the elastic filling layer 4 under the guidance of the prior art.

[0045] In the above step (2g), when applying the adhesive matching the elastic filling material to the bottom and both sides of the notch, care should be taken not to expose white on both sides, so as to prevent the gravel from being loosely bonded to the notch and falling off, thereby damaging the joint of the seamless expansion joint. The adhesive matching the elastic filling material can be modified asphalt material, which serves as an interface adhesive. Those skilled in the art can also select appropriate materials that can be used as interface adhesives according to the properties of the elastic filling material.

[0046] In the above step (2j), after the surface stone of the slot is rolled, a layer of heated elastic material sol is evenly sprinkled on the expansion joint to enhance the adhesion between the crushed stone itself and the road surface. Bridge deck and road surface repair belongs to the existing technology in this field and will not be described in detail in the present invention.

[0047] The present invention can effectively adjust the gap between the beam end and the back wall through the improved seamless expansion device of the beam. By setting a cement-based grouting material layer for pouring the gap at the beam end, the gap between the beam end and the back wall is adjusted to 8 mm, and an elastic filling layer is constructed, which can ensure the expansion and contraction deformation of the main beam on the one hand, and facilitate the transition of the rigidity connection between the main beam and the back wall on the other hand, thereby effectively reducing the impact effect of vehicles on the bridge deck on the main beam.

[0048] On the other hand, the present invention avoids the need to set up cross-joint steel plates through structural improvement. The adjusted beam end and the back wall are filled with elastic materials instead, which not only meets the requirements of expansion and contraction deformation of the main beam end, but also completely solves the durability problems of conventional seamless expansion joint construction systems, such as cracking and damage of expansion joints and water leakage of abutments, caused by the warping and deformation of cross-joint steel plates.

[0049] In addition, in terms of economy, the seamless expansion device of the bridge of the present invention can effectively avoid the occurrence of cracking, damage and collapse of expansion joints, avoid unnecessary waste caused by crack treatment, damage repair and expansion joint removal and repair in subsequent use, and save maintenance costs and repair project costs.

Brief Description of the Drawings

[0050] Figure 1 This is a general structural diagram of an existing bridge seamless expansion joint device.

[0051] Figure 2 This is the general structural diagram of the beam end filling bridge seamless expansion device described in the patent of this invention, which is suitable for the case where the bridge deck pavement is not modified;

[0052] Figure 3 This is the general structural diagram of the beam end filling bridge seamless expansion device described in the present invention, which is applicable to the overall transformation of the bridge deck pavement;

[0053] 1. Cement-based grouting material layer; 2. Steel mesh; 3. Elastic material layer cushion; 4. Elastic filling layer; 5. Asphalt binder; 6. Elastic filler; 7. Foam plastic board;

[0054] 11. Bridge deck asphalt; 12. Integrated concrete layer; 13. Beam end surface; 14. Abutment; 15. Support; 16. Bridge deck concrete cut; 17. Main beam; 18. Back wall;

[0055] 21. Sponge foam strips; 22. Steel cover plate; 23. Iron nails; 24. Elastic plastic mixture. [Specific implementation method]

[0056] Example 1

[0057] A 1×10m prestressed concrete simply supported hollow slab bridge on a municipal road has serious cracks, damage and collapse in the original seamless expansion joints of the abutments, with the actual gap at the beam ends ranging from 4.6 to 5.5cm. It is planned to replace the original seamless expansion joints with the new bridge seamless expansion joints described in the present invention without modifying the bridge deck.

[0058] like Figure 3 As shown, the construction steps are as follows:

[0059] (2a) On-site traffic control: According to the approved traffic control plan, the lanes will be closed and traffic control work will be carried out before the replacement of the telescopic device.

[0060] (2b) Marking and staking out: Based on the proposed slot width of 20 cm, the slot position of the seamless expansion joint is determined by marking and staking out;

[0061] (2c) Cutting notches: Cut the seamless expansion joint notches along the line according to the marked position. Keep the notch lines parallel during cutting to ensure the beauty of the bridge head joints.

[0062] (2d) Cleaning up the garbage at the beam end: Use a high-pressure water gun to wash the beam end and roughen the interface to expose the coarse aggregate, and then dry it;

[0063] (2e) A thin layer of elastic material is cast on the top of the abutment cap to ensure that the main beam can expand and contract normally during subsequent use. The thickness of the thin layer of elastic material cast at the bottom is about 1 cm;

[0064] (2f) Adjust the distance between beam ends: After the expansion joint slot is opened, the distance between the beam end and the back wall is adjusted by pouring cement-based grouting material on the beam end side. The pouring height is the full height of the back wall. After adjustment, the distance between the beam ends is 8 mm.

[0065] Among them, when adjusting the spacing between the beam ends, first take measures to seal the bottom of the beam end on the side of the abutment to ensure that the elastic filling material between the subsequent pouring of the adjustment section cement-based grouting material and the beam end back wall does not leak; then select 8mm thick foam board, pad it close to the back wall and fix it properly, and then pour the cement-based grouting material.

[0066] During pouring, to prevent leakage during pouring, first use cement-based grouting materials with normal fluidity to pour the lower layer at a height of 5 cm. After the material is initially set, vertically insert and fix the A4@100×100 steel mesh. The steel mesh should cover the entire width of the bridge and the height of the back wall. After the steel mesh is fixed, pour the upper layer with cement-based grouting materials with better fluidity. The pouring height is the full height of the back wall. After the cement-based grouting materials have reached the designed strength after curing, remove the foam board at the back wall and clean up the garbage in the gap; then clean and dry the gaps in the back wall at the beam end and the expansion joint slots.

[0067] (2g) pouring elastic filling material at the beam end: pour the elastic filling material in the 8 mm gap reserved at the beam end and cover the bottom and side surfaces of the expansion joint notch to form an elastic material "T"-shaped area, wherein the elastic filling material is composed of high-viscosity and high-elasticity modified asphalt and rubber particles in a weight ratio of 1:2;

[0068] (2h) Apply the adhesive to the notch: Apply the modified asphalt material as an adhesive evenly to the bottom and both sides of the notch. The two sides should not be exposed to white, so as to prevent the gravel from falling off due to the loose combination with the notch, thus damaging the seamless expansion joint;

[0069] (2i) Applying the bottom oil of the groove: Apply a layer of asphalt binder evenly and fully on the bottom surface of the groove, preheat it with a blowtorch, and then apply a layer of binder sol on the side of the groove after preheating;

[0070] (2j) Slot filler construction: The elastic filler for the slot of the seamless expansion joint is spread in layers and sections. First, the main layer is spread. The heated coarse stone (13.2-19.5 mm square hole sieve) can be spread in the slot. The upper surface of the coarse stone should be about 1 cm away from the top of the groove. Immediately pour the molten elastic material on the crushed stone. When the elastic material no longer sinks and the surface of the coarse stone is not exposed, the pouring can be stopped. After paving, it should be vibrated and compacted by a vibrating flat plate in time. Then the surface layer is spread. The heated fine stone (4.75-9.5 mm square hole sieve) and the elastic material are quickly mixed at the specified temperature. When the elastic material is completely wrapped on the surface of the fine stone and the surface of the fine stone is not exposed, the mixed surface fine stone is immediately spread on the main layer and compacted with a small vibrating roller or other effective equipment. Since the elastic crushed stone has good elasticity at room temperature, it must be rolled in time to prevent early damage caused by insufficient compaction due to temperature drop.

[0071] (2k) Surface finishing of expansion joints: After the surface stones of the notch are rolled, evenly sprinkle a layer of heated elastic material sol on the expansion joint, with a width of 2 cm on both sides of the notch to enhance the adhesion between the crushed stone and the road surface. Then use a scraper to quickly scrape it flat. For areas with traces of scraping by the scraper, use a flamethrower to bake it, melt it, and then level it until the surface flatness meets the construction requirements. In summer construction, the elastic material should be slightly higher than the bridge deck; in winter construction, it should be slightly lower than the bridge deck.

[0072] Finally, clean up the construction site and inspect the expansion joint construction. Traffic can be opened only after the requirements are met.

[0073] Embodiment 2:

[0074] A 1×8m concrete simply supported hollow slab bridge on a certain highway had cracks and damage of varying severity on the original seamless expansion joints of the abutments. The measured gap at the beam end was between 3.0-3.6cm. Coincidentally, the asphalt concrete pavement of the section was undergoing an overall overhaul, and it was planned to replace the original seamless expansion device with the bridge seamless expansion device of the present invention by means of overall reconstruction of the bridge deck.

[0075] See also Figure 2 , the construction steps are as follows:

[0076] (1a) Chisel off the asphalt and integrated concrete layer of the bridge deck to expose the gap between the beam end and the back wall;

[0077] (1b) Use a high-pressure water gun to clean, rinse and roughen the beam ends to expose the coarse aggregate, and then dry;

[0078] (1c) In order to ensure that the main beam can expand and contract normally during subsequent use, a thin layer of elastic material is poured on the top surface of the abutment cap with a thickness of about 1 cm;

[0079] (1d) Adjust the gap between the beam ends, and perform the same operation as step (6) of Example 1: adjust the gap between the beam end and the back wall by pouring cement-based grouting material on the beam end side. The pouring height is the height of the main beam. After adjustment, the gap between the beam ends is 8 mm.

[0080] (1e) After the cement-based grouting material of the adjustment section has reached the design strength, the construction of the integral concrete layer of the bridge shall be carried out;

[0081] (1f) After the integral concrete layer of the bridge has been cured to the designed strength, the foam board at the back wall is removed and the garbage in the gap is cleaned;

[0082] (1g) Clean with a high-pressure water gun, blow away loose soil, dust and debris with a forest fire extinguisher, and then dry with a flamethrower;

[0083] (1h) pouring elastic filling material in the 8mm gap reserved at the beam end to construct an elastic material layer; wherein the elastic filling material is composed of high-viscosity and high-elasticity modified asphalt and mineral powder in a weight ratio of 1:1.5;

[0084] (1i) Then, the bridge deck asphalt concrete is paved according to the prior art:

[0085] (1j) After the asphalt concrete paving construction is completed, vertical cuts are made on the asphalt concrete pavement at a position about 1m away from the gap at the end of the beam, and then the cuts are filled with elastic material.

[0086] After the construction is completed, the site will be cleaned up, the expansion joint construction will be inspected and accepted, and traffic will be opened.

[0087] In summary, the present invention ensures the effective transition of the rigidity between the beam end and the back wall through the structural design of the beam end gap adjustment section and the elastic material layer. The conventional cross-seam steel plate is eliminated, and the beam end gap adjustment section is set to completely solve the root cause of the cracking and damage of the seamless expansion joint caused by the original beam end gap being too large or the gap size being different;

[0088] Under the premise of ensuring the deformation of the main beam, the gap between the beam end and the back wall is reasonable. The high elastic material filled at the end can fully adapt to the extrusion and pulling of the main beam end under the condition of temperature rise and fall without cracking, which improves the performance and service life of the seamless expansion joint;

[0089] The expansion device of the present invention can avoid the occurrence of cracking, damage and collapse of the expansion joint during subsequent operation, saving subsequent maintenance costs and repair project costs, and has good economic advantages.

Claims

1. A method for installing a beam end filling type bridge seamless expansion device in the overall reconstruction of a bridge deck pavement, the seamless expansion device comprising an elastic material layer cushion layer (3) laid on the top surface of the abutment and located at the bottom of the gap between the main beam and the back wall, an elastic filling layer (4) arranged along the back wall surface, and a cement-based grouting material layer (1) arranged along the end surface of the beam, the elastic filling layer (4) and the cement-based grouting material layer (1) being bonded together, and the thickness of the elastic filling layer (4) is 8 mm; Features The installation method comprises the following steps: (1a) Chiseling off the asphalt (11) and the integrated concrete layer (12) on the bridge deck; (1b) pouring a thin layer of elastic material on the top surface of the abutment and at the bottom of the gap between the main beam and the back wall to construct an elastic material cushion layer (3); (1c) a foam plastic plate (7) arranged along the back wall, wherein the foam plastic plate (7) has a thickness of 8 mm; (1d) pouring cement-based grouting material between the foam plastic board (7) and the beam end surface (13) to construct a cement-based grouting material layer (1); (1e) After the poured cement-based grouting material reaches the designed strength, pouring construction of the bridge integrated concrete layer (12) is carried out; (1f) removing the foam plastic board (7) of step (1c), cleaning it, and then pouring the elastic filling material at the beam end to construct the elastic filling layer (4); (1g) Paving asphalt concrete on the entire bridge deck; (1h) Cutting and filling the asphalt pavement constructed in step (1g).

2. The installation method according to claim 1, characterized in that A steel mesh (2) is arranged in the cement-based grouting material layer (1).

3. The installation method according to claim 1, characterized in that The thickness of the cement-based grouting material layer (1) is ≥2 cm.

4. The installation method according to claim 1, characterized in that The elastic material layer cushion (3) is formed by mixing high-viscosity and high-elasticity modified asphalt and fillers.

5. The installation method according to claim 1, characterized in that The elastic filling layer (4) is formed by mixing high-viscosity and high-elasticity modified asphalt and fillers.

6. The method according to claim 1, characterized in that In step (1d), a steel mesh (2) is arranged between the foam plastic board (7) and the beam end surface (13), and then a cement-based grouting material is poured.

7. A method for installing a seamless expansion device of a beam end filling bridge without modifying the bridge deck pavement, the seamless expansion device comprising an elastic material layer cushion (3) laid on the top surface of the abutment and located at the bottom of the gap between the main beam and the back wall, an elastic filling layer (4) arranged along the wall surface of the back wall, and a cement-based grouting material layer (1) arranged along the end surface of the beam, the elastic filling layer (4) and the cement-based grouting material layer (1) being bonded together, and the thickness of the elastic filling layer (4) is 8 mm; Features The installation method comprises the following steps: (2a) According to the width of the expansion joint slot of the abutment, determine the position of the seamless expansion joint slot on the bridge deck; (2b) cutting the seamless expansion joint notch along the line according to the position of step (1); (2c) pouring a thin layer of elastic material on the top surface of the abutment and at the bottom of the gap between the main beam and the back wall to construct an elastic material cushion layer (3); (2d) a foam plastic plate (7) arranged along the back wall, wherein the foam plastic plate (7) has a thickness of 8 mm; (2e) pouring cement-based grouting material between the foam plastic board (7) and the beam end surface (13) to construct a cement-based grouting material layer (1); (2f) removing the foam plastic board (7) of step (2d), cleaning it, and then pouring the elastic filling material at the beam end to construct the elastic filling layer (4); (2g) Apply the adhesive matching the elastic filler evenly to the bottom and both sides of the groove; (2h) Then evenly spread asphalt binder on the bottom of the groove, preheat it with a blowtorch, and then apply a layer of binder sol on the side of the groove; (2i) Spread elastic filler in the groove of seamless expansion joint; (2j) Repair expansion joints and bridge decks.

8. The method according to claim 7, characterized in that In step (2e), a steel mesh (2) is arranged between the foam plastic board (7) and the beam end surface (13), and then a cement-based grouting material is poured.

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