Bridge expansion device with alkali-activated concrete layer

Abstract

The utility model provides a bridge expansion device with an alkali-activated concrete layer, which comprises an embedded steel bar, the alkali-activated concrete layer, a C-shaped steel expansion joint member and a water stop belt, the lower end of the embedded steel bar is embedded on a bridge body at two ends of an expansion joint, the alkali-activated concrete layer is arranged on the bridge body, and the C-shaped steel expansion joint member is arranged on the water stop belt. The upper ends of the embedded steel bars are embedded in the alkali-activated concrete layer on the corresponding side; the C-shaped steel expansion joint component comprises two C-shaped steel expansion joint component units, the rear ends of the two C-shaped steel expansion joint component units are connected to the corresponding embedded steel bars, the C-shaped steel expansion joint component units are embedded in the alkali-activated concrete layer, connecting openings in the front ends of the two C-shaped steel expansion joint component units are oppositely arranged, and the two ends of the water stop belt are embedded in the corresponding connecting openings respectively. The C-shaped steel expansion joints and the embedded steel bars can be poured only by being lapped and bound, construction is simple and efficient, later maintenance is easy, the site construction period can be shortened, and the purpose of rapid traffic is achieved.

Description

Technical field

[0001] The utility model relates to the technical field of bridge erection, in particular to a bridge expansion device with an alkali-activated concrete layer. [Background technology]

[0002] Bridge expansion joints are a crucial connecting component in bridge structures, ensuring both safe and comfortable driving while meeting the bridge's expansion and contraction requirements. In bridge engineering applications, expansion joints bear the repetitive impact of wheel loads and are exposed to the atmosphere for extended periods, creating harsh operating environments. Furthermore, they must adapt to the bridge's complex displacements, making them a vulnerable and difficult-to-repair component of the bridge structure, a persistent challenge in transportation construction and management.

[0003] Existing on-site installation of bridge expansion joints involves pre-reserving notches on both sides of the bridge joint and installing pre-buried rebar in these notches. When the bridge expansion joint is installed, the asphalt and temporary filler are cut and removed according to the notch size. The expansion joint is then hoisted into the expansion joint notch and welded to the desired position. Finally, concrete is poured into the expansion joint, and the concrete is cured for approximately seven days before traffic is allowed to flow.

[0004] The shortcomings of the existing bridge expansion device and installation method are:

[0005] (1) It is troublesome to clean the installation notch, which often damages the original embedded steel bars, and debris easily falls off the beam end;

[0006] (2) The concrete surface is uneven and there is a serious misalignment with the bridge deck pavement. Under the action of traffic impact load, tensile stress cracks are generated, causing the concrete anchoring area of the expansion joint to crack and peel off.

[0007] (3) The damage to the expansion joint beam supporting components exacerbates the impact on the expansion joint. At the same time, the pipe maintenance is not in place and the expansion joint is not repaired in time, causing the steel components of the expansion device (special-shaped steel, etc.) to break;

[0008] (4) The position and size deviation of the embedded steel bars are large and cannot be directly welded to the telescopic device, which affects the anchoring strength of the telescopic device;

[0009] (5) The installation period is long and the process is complicated, which requires long-term traffic interruption and seriously affects the construction work of the bridge deck intersection. [Summary of the invention]

[0010] The technical problem to be solved by the present invention is to provide a bridge expansion device with an alkali-activated concrete layer to overcome the above-mentioned deficiencies in the prior art.

[0011] The present utility model is realized as follows:

[0012] A bridge expansion device with an alkali-activated concrete layer, the bridge expansion device is arranged at the expansion joint of the bridge beam body, the bridge expansion device includes embedded steel bars, an alkali-activated concrete layer, a C-shaped steel expansion joint member and a water stop belt, the lower ends of the embedded steel bars are buried on the bridge beam bodies at both ends of the expansion joint, the alkali-activated concrete layer is arranged on the bridge beam body, and the upper ends of the embedded steel bars are buried in the corresponding alkali-activated concrete layer;

[0013] The C-shaped steel expansion joint member includes two C-shaped steel expansion joint member units, the rear ends of the C-shaped steel expansion joint member units are connected to the corresponding embedded steel bars, and the C-shaped steel expansion joint member units are buried in the alkali-activated concrete layer, the front ends of the C-shaped steel expansion joint member units are provided with a connection port, the two connection ports are arranged opposite to each other and face the expansion joint side, and the two ends of the water stop belt are respectively embedded in the corresponding connection ports.

[0014] A further technical solution thereof is: a buffer baffle is arranged between the alkali-activated concrete layer and the asphalt layer at its rear side; the upper surface of the alkali-activated concrete layer is flush with the asphalt layer.

[0015] A further technical solution thereof is: each C-shaped steel expansion joint member unit includes a C-shaped steel fixing piece and a fixing steel bar, the front end of the C-shaped steel fixing piece is provided with a connection port, the rear end of the C-shaped steel fixing piece is fixedly connected with one end of the fixing steel bar, and the other end of the fixing steel bar is tied to the corresponding embedded steel bar.

[0016] A further technical solution thereof is: the water stop belt is arranged along the entire length of the bridge expansion joint.

[0017] A further technical solution thereof is: the water stop belt is made of a polymer material or a metal material.

[0018] A further technical solution thereof is: limiting platforms are arranged on the upper and lower sides of the C-shaped connection port of the C-shaped steel fixing piece, installation heads matching the arc of the C-shaped connection port are arranged at the two ends of the water stop belt, and each installation head is movably connected with the corresponding C-shaped connection port.

[0019] The present utility model has the following advantages:

[0020] The C-shaped steel expansion joint component provided by the utility model can be tied and lapped on the embedded steel bars of the beam body, and further anchored by alkali-activated recycled concrete, which is simple and efficient in construction and ensures the reliability of the connection. It can be quickly assembled and installed at the construction site of the expansion device, greatly shortening the installation period of the expansion device, not affecting the cross-construction of the bridge deck, solving the technical problem that the installation construction period of the traditional expansion device is long and seriously affects the cross-construction of the bridge deck, and providing convenience for the later maintenance work.

[0021] In short, the C-shaped steel expansion joint of the utility model only needs to be lapped and tied with the embedded steel bars for pouring, which has the characteristics of simple and efficient construction; a buffer baffle is arranged between the alkali-activated concrete layer and the asphalt layer at its rear side, which can buffer and disperse the impact load conducted from the asphalt layer, reduce the impact on the bridge expansion device during vehicle driving, and improve the service life of the bridge expansion device.

Description of the Drawings

[0022] The following further describes the utility model with reference to the drawings in conjunction with embodiments.

[0023] Figure 1 It is a schematic diagram of a bridge expansion device with an alkali-activated concrete layer of the utility model.

[0024] Figure 2 It is a schematic diagram of paving the asphalt pavement during the construction of a bridge expansion device with an alkali-activated concrete layer of the utility model.

[0025] Figure 3 It is a schematic diagram of grooving and cleaning the joint during the construction of a bridge expansion device with an alkali-activated concrete layer of the utility model.

[0026] Figure 4 It is a schematic diagram of positioning and tying the C-shaped steel expansion joint component during the construction of a bridge expansion device with an alkali-activated concrete layer of the utility model.

[0027] Figure 5 It is a schematic diagram of pouring the alkali-activated concrete layer during the construction of a bridge expansion device with an alkali-activated concrete layer of the utility model.

[0028] Description of the reference numerals:

[0029] 1 - Embedded steel bar; 2 - Alkali-activated concrete layer; 3 - C-shaped steel expansion joint component; 31 - C-shaped steel expansion joint component unit; 311 - Connection port; 312 - C-shaped steel fixing piece; 3121 - Limit platform; 313 - Fixed steel bar; 4 - Waterstop; 41 - Installation head; 5 - Buffer baffle;

[0030] 10 - Bridge beam body; 20 - Expansion joint; 30 - Asphalt layer; 40 - Temporary baffle.

Detailed implementation manners

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] Refer to Figure 1 , the present utility model relates to a bridge expansion device with an alkali-activated concrete layer. The bridge expansion device is arranged at the expansion joint 20 of the bridge beam body 10. The bridge expansion device includes embedded steel bars 1, an alkali-activated concrete layer 2, a C-shaped steel expansion joint member 3, and a waterstop 4. The lower ends of the embedded steel bars 1 are buried in the bridge beam body 10 at both ends of the expansion joint. The alkali-activated concrete layer 2 is arranged on the bridge beam body 10, and the upper ends of the embedded steel bars 1 are buried in the corresponding side of the alkali-activated concrete layer 2;

[0034] The C-shaped steel expansion joint member 3 includes two C-shaped steel expansion joint member units 31. The rear ends of the C-shaped steel expansion joint member units 31 are connected to the corresponding embedded steel bars 1, and each of the C-shaped steel expansion joint member units 31 is buried in the alkali-activated concrete layer 2. A connection port 311 is arranged at the front end of each of the C-shaped steel expansion joint member units 31. The two connection ports 311 are arranged oppositely and face the expansion joint 20. The two ends of the waterstop 4 are respectively connected to the corresponding connection ports 311;

[0035] In a specific implementation, a preferred embodiment is as follows: A buffer baffle 5 is provided between the alkali-activated concrete layer 2 and the asphalt layer 30 at its rear side. It can buffer and disperse the impact load conducted from the asphalt layer 30, reduce the impact on the bridge expansion device during vehicle driving, and improve the service life of the bridge expansion device. The upper surface of the alkali-activated concrete layer 2 is flush with the upper surface of the asphalt layer 30.

[0036] In a specific implementation, a preferred embodiment is as follows: Each C-shaped steel expansion joint component unit 31 includes a C-shaped steel fixing member 312 and a fixing steel bar 313. A connection port 311 is provided at the front end of the C-shaped steel fixing member 312. The rear end of the C-shaped steel fixing member 312 is fixedly connected to one end of the fixing steel bar 313, and the other end of the fixing steel bar 313 is tied to the corresponding embedded steel bar 1.

[0037] In a specific implementation, a preferred embodiment is as follows: The water stop belt 4 is arranged along the entire length of the bridge expansion joint 20.

[0038] In a specific implementation, a preferred embodiment is as follows: The water stop belt 4 is made of a polymer material or a metal material.

[0039] In a specific implementation, a preferred embodiment is as follows: Limiting platforms 3121 are provided on both the upper and lower sides of the C-shaped connection port 311 of the C-shaped steel fixing member 312. Installation heads 41 that match the curvature of the C-shaped connection port 311 are provided at both ends of the water stop belt 4. Each installation head 41 is movably connected to the corresponding C-shaped connection port, and can adapt to the expansion and contraction deformation of the expansion joint under external loads. The setting of the limiting platforms 3121 can prevent the installation heads 41 of the water stop belt 4 from detaching from the connection port;

[0040] Refer to Figures 2 - 5 , in another embodiment of the present invention, the installation method of a bridge expansion device with an alkali-activated concrete layer is as follows: Embed the steel bar 1 during the construction of the bridge beam body 10 in the early stage. During the assembly installation construction of the expansion device in the later stage, after the C-shaped steel expansion joint components 3 are tied and lapped, the alkali-activated concrete layer 2 can be poured; The construction method includes the following steps:

[0041] A. Requirements for embedding steel bars in the bridge beam body 10 in the early stage and paving:

[0042] A1. Embed the steel bar during the prefabrication and in-situ casting of the beam body;

[0043] A2. Temporarily cover the beam end gap with a temporary baffle 40, and then start paving the asphalt pavement, controlling the uniform thickness of the asphalt pavement.

[0044] B. Assembly installation of the expansion device:

[0045] B1. Drawing lines, grooving, and cleaning joints: Draw the position lines of the installation slots according to the construction drawing dimensions, cut the asphalt pavement along the drawn lines according to the depth of the bridge deck paving, and clean the asphalt and sundries in the installation slots. The installation slots for laying the alkali-activated concrete layer can extend into the bridge beam body. The longitudinal cutting section of the asphalt layer can be flush with the alkali-activated concrete layer or partially overlapped. After cutting, the temporary baffle 40 can be removed or partially reserved in the slot.

[0046] B2. Installing the expansion joint device: Bind and overlap the C-shaped steel expansion joint member 3 with the embedded steel bars 1.

[0047] B3. Pouring the alkali-activated concrete layer 2 and fixing the waterproof device: After overlapping, the alkali-activated concrete layer 2 can be poured. Before it sets, fix the C-shaped steel fixing piece 312 in place. The water stop belt 4 is embedded on the C-shaped steel fixing piece 312 of the C-shaped steel expansion joint member 3 to prevent rainwater from flowing from the bottom of the C-shaped steel expansion joint member 3 to the beam end, and cure the alkali-activated concrete layer 2.

[0048] In summary, the advantages of the present utility model are as follows:

[0049] The C-shaped steel expansion joint member provided by the present utility model can be bound and overlapped with the embedded steel bars on the beam body, and is further anchored by alkali-activated recycled concrete. The construction is simple and efficient, and the reliability of the connection is ensured. The prefabricated installation can be quickly carried out at the construction site of the expansion joint device installation, greatly shortening the installation period of the expansion joint device, not affecting the cross-construction of the bridge deck, solving the technical problem that the installation construction period of the traditional expansion joint device is long and seriously affects the cross-construction of the bridge deck, and providing convenience for the later maintenance work.

[0050] In short, the C-shaped steel expansion joint of the present utility model only needs to be overlapped and bound with the embedded steel bars for pouring, which has the characteristics of simple and efficient construction; a buffer baffle is provided between the alkali-activated concrete layer and the asphalt layer at its rear side, which can buffer and disperse the impact load transmitted from the asphalt layer, reduce the impact on the bridge expansion joint device during vehicle driving, and improve the service life of the bridge expansion joint device.

[0051] Although the specific implementation manners of the present utility model have been described above, those skilled in the art of this technology should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present utility model. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present utility model should be covered within the scope protected by the claims of the present utility model.

Claims

1. A bridge expansion device with an alkali-activated concrete layer, the bridge expansion device is arranged at the expansion joint of the bridge girder, and is characterized in that: The bridge expansion device includes embedded steel bars, an alkali-activated concrete layer, a C-shaped steel expansion joint member, and a waterstop. The lower ends of the embedded steel bars are buried in the bridge girders at both ends of the expansion joint, the alkali-activated concrete layer is arranged on the bridge girders, and the upper ends of the embedded steel bars are buried in the corresponding side of the alkali-activated concrete layer; The C-shaped steel expansion joint member includes two C-shaped steel expansion joint member units. The rear ends of the C-shaped steel expansion joint member units are connected to the corresponding embedded steel bars, and each C-shaped steel expansion joint member unit is buried in the alkali-activated concrete layer. A connection port is arranged at the front end of each C-shaped steel expansion joint member unit. The two connection ports are arranged opposite to each other and face the expansion joint side. The two ends of the waterstop are respectively embedded in the corresponding connection ports.

2. The bridge expansion device with an alkali-activated concrete layer according to claim 1, characterized in that: A buffer baffle is arranged between the alkali-activated concrete layer and the asphalt layer at its rear side; the upper surface of the alkali-activated concrete layer is flush with the asphalt layer.

3. A bridge expansion device with an alkali-activated concrete layer according to claim 1, characterized in that: Each C-shaped steel expansion joint member unit includes a C-shaped steel fixing piece and a fixing steel bar. A connection port is arranged at the front end of the C-shaped steel fixing piece. The rear end of the C-shaped steel fixing piece is fixedly connected to one end of the fixing steel bar, and the other end of the fixing steel bar is tied to the corresponding embedded steel bar.

4. A bridge expansion device with an alkali-activated concrete layer according to claim 1, characterized in that: The waterstop is arranged along the entire length of the bridge expansion joint.

5. A bridge expansion device having an alkali-activated concrete layer according to claim 1, characterized in that: The waterstop is made of a polymer material or a metal material.

6. The bridge expansion device with an alkali-activated concrete layer according to claim 3, characterized in that: Limit platforms are arranged on the upper and lower sides of the C-shaped connection port of the C-shaped steel fixing piece. Installation heads matching the curvature of the C-shaped connection port are arranged at both ends of the waterstop, and each installation head is movably connected to the corresponding C-shaped connection port.

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