A new type of combined telescopic device structure and construction method

Abstract

The present invention relates to a novel combined telescopic device structure, including a pair of bridge bodies with opposite ends. The bridge body is composed of a main beam, a bridge deck layer laid on the top of the main beam, and a bridge deck pavement layer laid on the top of the bridge deck layer. It is characterized in that: at the top of the end of the main beam, there is a comb-type steel plate for spanning the joint and fixed at the end part. At the top of the comb-type steel plate, there is an uneven UHPC plate for connecting the bridge deck layer, and its surface layer is a modified asphalt macadam layer or an SMA-13 asphalt mastic pavement layer. It effectively improves the stiffness at the continuous part of the bridge deck, enhances the overall vertical stiffness and strength of the connection structure, makes it match the vertical stiffness of the bridge deck, and can significantly reduce diseases such as edge gnawing of the reserved groove and cracking of the elastomer caused by a large deformation difference when the wheel rolls over the expansion joint. It better adapts to the complex spatial stress state of the bridge deck and meets the normal use requirements of the continuous structure of the bridge deck.

Description

Technical Field

[0001] The present invention relates to a novel combined telescopic device structure and construction method. Background Art

[0002] In traditional jointed bridges, the bridge expansion joint is a weak position in the bridge structure design and has become one of the problems in bridge construction and maintenance. The expansion joint directly bears the vehicle load, environment and other effects, and is extremely prone to diseases and even failure. When the expansion joint is damaged, it is often accompanied by cracking, damage and edge nibbling of the concrete pavement connected to it. Over time, uneven settlement and pavement heaving occur in this part of the pavement, greatly reducing the service quality of the bridge and affecting the safety and durability of the bridge structure.

[0003] Traditionally, to solve the problem of easy damage of the bridge expansion joint, it is mainly achieved by improving the expansion joint structure or canceling the expansion joint. However, improving the expansion joint structure can only reduce the replacement cycle and damage degree of the expansion joint, and cannot fundamentally solve the maintenance and replacement problems of the expansion joint. Therefore, canceling the expansion joint structure at the piers, especially at the abutments, and carrying out seamless and continuous transformation of the overall structure, semi-integral structure or extended bridge deck is an important measure to improve the service function of existing bridges, improve durability and reduce maintenance. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a novel combined telescopic device structure and construction method.

[0005] To solve the above technical problem, the technical solution of the present invention is: a novel combined telescopic device structure, including a pair of bridge bodies with opposite ends. The bridge body is composed of a main beam, a bridge deck layer laid on the top of the main beam, and a bridge deck pavement layer laid on the top of the bridge deck layer. It is characterized in that: a comb-type steel plate for spanning the joint and fixed at the end part is arranged on the top of the end of the main beam, and an uneven UHPC plate for connecting the bridge deck layer is arranged on the top of the comb-type steel plate, and its surface layer is a modified asphalt gravel layer or an SMA-13 asphalt mastic pavement layer.

[0006] Preferably, the comb-type steel plate is fixed to the end of the main beam by expansion bolts. An elastic filler layer is filled in the tooth gaps of the comb-type steel plate, and the redundant parts excavated on both sides of the comb-type steel plate and the beam end are leveled by an epoxy mortar leveling layer.

[0007] Preferably, a waterproof layer is arranged below the movable gap between the teeth of the comb-type steel plate.

[0008] Preferably, the lengths of the two sides of the slit between the teeth of the comb-type steel plate are not equal.

[0009] Preferably, the UHPC board is divided into a middle precast board and post-cast areas on both sides. The post-cast areas on both sides are mirror-symmetrical left and right. The post-cast areas are provided with steel reinforcement cages that are tied and connected to the steel bars of the bridge deck layer, the middle precast board, and the main beam. Double-layer symmetrical chord corrugated steel bars and transverse straight bars are arranged in the middle precast board. The middle precast board is divided into a deformation area with a grooved interface treatment to weaken the interface and a bearing area without special treatment and intact.

[0010] Preferably, an active area is formed between the surface of the double-layer symmetrical chord corrugated steel bars and the UHPC fine aggregate by applying epoxy and mastic materials.

[0011] Preferably, the grooved areas are divided into deep grooves and shallow grooves, and both grooves are filled with fillers. The deep grooves are filled with a bonding material of asphalt mastic, and the shallow grooves are provided with polyurethane filling elastic fillers. The fillers are filled completely, and their final top surfaces are flush with the bearing area of the middle precast board.

[0012] Preferably, the modified asphalt macadam layer or the SMA-13 asphalt mastic paving layer is connected and flush with the upper surface of the original bridge deck paving layer.

[0013] A construction method for a new combined expansion device structure is carried out according to the following steps:

[0014] (1) Precast the middle precast board of UHPC and the comb-tooth steel plate in the factory according to the drawing dimensions and on-site requirements, and do anti-corrosion and rust-proof treatments.

[0015] (2) Before erecting the main beam, the construction process is carried out normally according to the conventional steps. After the main beam is placed, add foam sponge caulking material.

[0016] (3) Then place the comb-tooth steel plate at the corresponding position between the main beams. Drive expansion bolts into the reserved holes of the comb-tooth steel plate and fill them with epoxy mortar. Pour an appropriate amount of flexible elastic or asphalt filler into the tooth gaps of the comb-tooth steel plate. Then fill and level the fixed edge tooth gaps with epoxy mortar. Finally, lay a rubber non-bonding layer on it.

[0017] (4) Place the middle precast board of UHPC at the corresponding position, and then carry out the steel bar binding work of the bridge deck and the post-cast areas of the transverse bridge and the wet joint steel bars in the longitudinal direction of the bridge.

[0018] (5) Start the post-cast work, carry out the pouring work of the post-cast areas on both sides and the pouring work of the transverse wet joint UHPC blocks. During the pouring, carry out pre-pressing of the mold to make it concave-convex like the middle precast board. Then carry out the pouring of the post-cast areas on both sides and the pouring of the bridge deck layer, and carry out normal curing and forming.

[0019] (6) Finally, the paving of the bridge deck pavement is carried out. At the expansion joint, modified asphalt macadam or SMA-13 asphalt mastic is used for paving, and the rest of the bridge deck surface is paved with ordinary asphalt, compacted and flattened, and it can be opened to traffic after curing for 3 to 5 hours.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] ①. Effectively improves the stiffness at the continuous part of the bridge deck, enhances the overall vertical stiffness and strength of the connection structure, makes it match the vertical stiffness of the bridge deck, and can significantly reduce diseases such as edge gnawing of the reserved groove and cracking of the elastomer caused by large deformation differences when the wheels roll over the expansion joint. It better adapts to the complex spatial stress state of the bridge deck and meets the normal use requirements of the bridge deck continuous structure.

[0022] ②. Has good deformation performance. It has good deformation ability in the longitudinal direction of the bridge to adapt to the expansion and contraction deformation of the beam body due to shrinkage, creep and temperature changes, and also has a certain stiffness to effectively resist the horizontal displacement of the upper structure of the bridge under the action of braking force, and can also reduce the deviation of the pier, which is beneficial to the force of the pier.

[0023] ③. Has convenient construction performance. The bridge deck connection structure has a simple form, no complex steel bar connection structure, the UHPC connecting plate is also prefabricated, and it is suitable for the construction of new bridges. The cumbersome process of chiseling and installing the expansion joint is cancelled, and the installation and equipment process is completed in one go. It effectively prevents the damage to the UHPC solidification process caused by the disturbance of passing vehicles, and construction can be carried out without completely closing the traffic during local reinforcement.

[0024] The following further elaborates on the present invention in detail with reference to the accompanying drawings and specific embodiments. Brief Description of the Drawings

[0025] Figure 1 is the structural elevation view of the present invention;

[0026] Figure 2 is the schematic diagram of the double-layer symmetric chord waveform steel bar arrangement of the present invention;

[0027] Figure 3 is the schematic diagram of the comb-tooth steel plate of the present invention.

[0028] In the figure: 1 - ordinary asphalt pavement layer; 2 - modified asphalt macadam layer or SMA-13 asphalt mastic pavement layer; 3 - polyurethane filling elastic filler layer; 4 - asphalt mastic; 5 - double-layer symmetric chord waveform steel bar; 6 - post-cast block area; 7 - middle precast slab; 8 - rubber non-bonding layer; 9 - comb-tooth steel plate; 10 - epoxy mortar leveling layer; 11 - bridge deck layer; 12 - main beam. Specific Embodiments

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] As Figures 1 to 3 shown, this embodiment provides a novel combined telescopic device structure, including a pair of bridge bodies with opposite ends. The bridge body is composed of a main beam, a bridge deck layer laid on the top of the main beam, and a bridge deck pavement layer laid on the top of the bridge deck layer. It is characterized in that: a simple comb-type steel plate for spanning the joint and fixed at the end part is arranged on the top of the end of the main beam. An uneven UHPC plate for connecting the bridge deck layer is arranged on the top of the comb-type steel plate, and its surface layer is a modified asphalt gravel layer or an SMA-13 asphalt mastic pavement layer. This structure can not only achieve seamless bridge decks, but also effectively shorten the construction period and have little impact on traffic.

[0033] In the embodiment of the present invention, in order to fix the comb-type steel plate to the main beam, the comb-type steel plate is fixed to the end of the main beam through expansion bolts, so that the steel plate and the main beam become an integral body; due to factors such as temperature and external forces, the two bridge bodies will undergo local deformation or expansion and contraction. Therefore, an elastic filler layer is filled in the tooth gaps of the comb-type steel plate, and the redundant parts excavated on both sides of the comb-type steel plate and the beam end are leveled through an epoxy mortar leveling layer.

[0034] In the embodiment of the present invention, a waterproof layer is arranged below the movable gap between the teeth of the comb-type steel plate, and the waterproof layer is made of a rubber pad or epoxy resin mortar.

[0035] In the embodiment of the present invention, the lengths of the two sides of the tooth gap of the comb-type steel plate are not equal. Let the side with the tooth gap be shorter, and the other side be longer.

[0036] In the embodiment of the present invention, the UHPC plate is divided into a middle precast plate and post-cast block areas on both sides. The post-cast block areas on both sides are mirror-symmetrical left and right. The post-cast block areas are provided with steel reinforcement cages that are tied and connected to the steel reinforcements of the bridge deck layer, the middle precast plate, and the main beam. Double-layer symmetrical chord corrugated steel bars and transverse straight steel bars are arranged in the middle precast plate. The middle precast plate is divided into a deformation area with a grooved interface weakening treatment and a bearing area without special treatment and intact.

[0037] In the embodiment of the present invention, sawing seams are made at the bottom of the middle precast plate of the UHPC plate to eliminate irregular fracture seams caused by differences in thermal expansion coefficients.

[0038] In the embodiment of the present invention, an active area is formed between the surface of the double-layer symmetrical chord corrugated steel bars and the UHPC fine aggregate by applying materials such as epoxy and mastic.

[0039] In the embodiment of the present invention, the grooved areas are divided into deep grooves and shallow grooves, and both grooves are filled with fillers. The deep grooves are filled with bonding materials such as asphalt mastic, and the shallow grooves are provided with polyurethane filling elastic fillers. The fillers are filled completely, and their final top surfaces are flush with the bearing area of the middle precast plate.

[0040] In the embodiment of the present invention, the modified asphalt macadam layer or SMA-13 asphalt mastic paving layer is connected and flush with the upper surface of the original bridge deck paving layer, and the bridge deck paving layer is a common asphalt paving layer.

[0041] A construction method for a novel combined expansion device structure is carried out according to the following steps:

[0042] (1) Precast the middle precast plate of UHPC and the comb-tooth steel plate according to the drawing dimensions and on-site requirements in the factory, and perform anti-corrosion and rust-proof treatments.

[0043] (2) The construction process is carried out according to the normal steps before the main beam is erected. After the main beam is placed, caulking materials such as foam sponges are added.

[0044] (3) Then place the comb-tooth steel plate at the corresponding position between the main beams. Drive expansion bolts into the reserved holes of the comb-tooth steel plate and fill them with epoxy mortar. Pour an appropriate amount of flexible elastic or asphalt filler into the tooth gaps of the comb-tooth steel plate. Then fill and level the fixed edge tooth gaps with epoxy mortar. Finally, lay a rubber non-bonding layer on it.

[0045] (4) Place the middle precast plate of UHPC at the corresponding position, and then carry out the steel reinforcement binding work of the bridge deck and the post-cast block areas in the transverse bridge direction and the wet joint steel reinforcement binding work in the longitudinal bridge direction.

[0046] (5) Start the post-casting work, carry out the casting work in the post-cast block areas on both sides and the casting work of the transverse wet joint UHPC blocks. During the casting, pre-press the mold at the same time to make it concave-convex like the middle precast slab. Then, carry out the casting of the post-cast block areas on both sides and the casting of the bridge deck layer, and cure and form it normally.

[0047] (6) Finally, carry out the paving of the bridge deck pavement. At the expansion joint, use modified asphalt macadam or SMA-13 asphalt mastic for paving, and use ordinary asphalt for paving the rest of the bridge deck surface layer. Compress and flatten it, and it can be opened to traffic after curing for 3 to 5 hours.

[0048] The above is only the preferred embodiment of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A combined telescopic device structure, characterized in that: The invention comprises a bridge body with a pair of ends facing each other, the bridge body is composed of a main beam, a bridge deck layer laid on the top of the main beam, and a bridge deck pavement layer laid on the top of the bridge deck layer, and is characterized in that: a comb-tooth steel plate for spanning the seam and fixed to the end portion is arranged on the top of the end of the main beam, a concave-convex UHPC plate for connecting the bridge deck layer is arranged on the top of the comb-tooth steel plate, and its surface layer is a modified asphalt crushed stone layer; the comb-tooth steel plate is fixed to the end of the main beam by expansion bolts, the tooth gap of the comb-tooth steel plate is filled with an elastic filler layer, and the excess parts of the two sides of the comb-tooth steel plate and the beam end are filled with epoxy mortar The flat layer is leveled; the teeth of the comb-tooth steel plate have unequal lengths on both sides; the UHPC plate is divided into a central precast plate and post-cast blocks on both sides, the post-cast blocks on both sides are mirror-symmetrical, the post-cast blocks are provided with a steel cage and the bridge deck layer, the central precast plate and the main beam are connected by steel bars, the central precast plate is provided with double-layer symmetrical chord-shaped steel bars and transverse straight bars, the central precast plate is divided into a deformation zone with grooved interface weakening treatment and a complete bearing zone without special treatment; the surface of the double-layer symmetrical chord-shaped steel bars is coated with epoxy, mortar materials and UHPC fine aggregate to form an active zone.

2. The combined telescopic device structure according to claim 1, characterized in that: A waterproof layer is arranged below the movable gaps between the comb teeth of the comb-tooth type steel plate.

3. The combined telescopic device structure according to claim 1, characterized in that: The grooves are divided into deep grooves and shallow grooves, and there are fillers in the grooves. The deep grooves are filled with asphalt mastic bonding materials, and the shallow grooves are provided with polyurethane elastic fillers. The filling materials are completely filled, and the final top surface is flush with the bearing area of ​​the middle prefabricated panel.

4. The combined telescopic device structure according to claim 1, characterized in that: The modified asphalt crushed stone layer is connected with and flush with the upper surface of the original bridge deck pavement layer.

5. A construction method for the combined telescopic device structure according to any one of claims 1-4, characterized in that, Follow these steps: (1) Prefabricate the UHPC middle prefabricated panels and comb-tooth steel plates in the factory according to the drawing dimensions and site requirements, and carry out anti-corrosion and anti-rust treatment; (2) Before erecting the main beam, the construction process is carried out normally according to the conventional steps. After the main beam is placed, the foam sponge filler is added; (3) Place comb-tooth steel plates at the corresponding positions between the main beams, drive expansion bolts into the reserved holes of the comb-tooth steel plates and fill them with epoxy mortar, pour elastic fillers between the teeth of the comb-tooth steel plates, fill and level the teeth between the fixed edges with epoxy mortar, and finally lay a rubber non-adhesive layer on top; (4) Place the middle precast slab of UHPC at the corresponding position, and then tie the steel cage of the bridge deck and the backcast block area in the transverse direction of the bridge, and tie the wet joint steel bars along the bridge direction; (5) Start the post-casting work, and carry out the casting work of the post-casting block area on both sides and the casting work of the transverse wet joint UHPC block. During the casting, the mold is pre-pressed to make it concave and convex like the middle precast slab. Then, the casting of the post-casting block area on both sides and the casting of the bridge deck layer are carried out, and normal curing and molding are carried out; (6) Finally, the bridge deck pavement layer is paved. Modified asphalt gravel is used for paving at the expansion device, and ordinary asphalt is used for paving the rest of the bridge deck surface layer. After compaction and flattening, it can be opened to traffic after 3 to 5 hours of maintenance.

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