A prestressed assembly type bridge expansion joint structure and method in a drought alpine region

Abstract

The application discloses a kind of dry high-cold region prestressed assembly type bridge expansion joint structure and method, belong to assembly type bridge technical field.The application includes prefabricated box girder and is installed in the expansion joint structure between two groups of prefabricated box girder, the expansion joint structure includes splicing component one, splicing component two, hot melt mechanism, floating detector and drainage mechanism;The splicing component one, splicing component two are fixed in the splicing of two groups of prefabricated box girder respectively.The application designs a kind of expansion joint structure for dry high-cold region prestressed assembly type bridge, when expansion joint position appears icing condition in low temperature environment, through hot melt mechanism, ice can be melted, liquid water acts on floating detector, and floating detector is powered on drainage mechanism to open the drain opening inside expansion joint, that is, automatic drainage can be carried out, the normal use of expansion joint can be effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated bridges, more particularly to a passivation liquid level control device for a roller coater and a control method thereof. BACKGROUND

[0002] Prestressed prefabricated bridge is a common type of bridge in structural engineering, which uses prestressed force and the properties of concrete to increase the carrying capacity and durability of the bridge. In prestressed prefabricated bridges, prestressed reinforcement or prestressed tendons are introduced into the concrete of bridge components such as beams, slabs, and columns, and by applying a predetermined tensile force, internal compressive stress is generated, making the concrete in a compressed state. After the prestressed force is applied, the prestressed reinforcement or prestressed tendons try to stretch back to their original state, while the concrete bears the compressive stress caused by the prestressed force. The introduction of this prestressed force makes the bridge structure have better performance under normal use and load, including higher carrying capacity, smaller deflection and deformation, better crack resistance and longer service life. The prestressed force of the prestressed prefabricated bridge can be applied in various ways, the most common method is to use tensioning equipment and anchoring system. The application of prestressed force is usually carried out during the production process of bridge components, and is applied before the concrete reaches sufficient strength, and is anchored after the concrete reaches the design strength, so as to ensure that the prestressed force is effectively transmitted to the concrete and the bridge components have the required strength and stiffness. In order to ensure the normal use of the bridge to cope with temperature changes, expansion joints are usually provided at the nodes of the bridge, which are special connecting parts in the bridge structure, allowing the bridge to stretch and deform due to temperature changes, deflection, earthquakes or other factors, while maintaining the integrity of the structure and reducing stress concentration. The expansion joint is located between two adjacent components of the bridge, usually between the piers or between the piers and the bridge segments. The design and installation of expansion joints take into account the expansion and deformation of the bridge structure under different working conditions to reduce stress and deformation concentration caused by temperature changes, load changes or earthquakes, thereby protecting the structural safety and functionality of the bridge.

[0003] However, the existing prestressed prefabricated bridge expansion joint has the following problems in use: the temperature in high-cold regions is often below freezing point, when water enters the expansion joint, it will freeze and expand at low temperature, this frost heaving phenomenon may cause damage or failure of the expansion joint, and when the temperature rises, the ice melts and becomes water, the expansion joint may be invaded by water, causing corrosion and damage, thereby affecting the use effect of the expansion joint, and there is a lack of corresponding treatment means. Therefore, it is necessary to design a corresponding technical scheme to solve the existing technical problems. SUMMARY

[0004] 1. Technical problems to be solved by the present application

[0005] In view of the defects and shortcomings of the prior art, the present application provides a kind of expansion joint structure and method of prestressed assembly type bridge in arid alpine region, solve the temperature of high and cold region is often below freezing point, when water enters the inside of expansion joint, it can freeze and expand under low temperature, this frost heaving phenomenon can cause damage or failure of expansion joint, and when the temperature rises, ice melts and becomes water, and the expansion joint can be invaded by water, resulting in corrosion and damage, thereby affecting the use effect of expansion joint, lack of corresponding processing means technical problem, when the expansion joint position appears icing condition in low temperature environment, the ice can be melted by the hot melt mechanism, the liquid water acts on the floating detector, and the floating detector is connected with the drainage mechanism to open the drainage port in the expansion joint, so that automatic drainage treatment can be carried out, which can effectively solve the influence of icing or water invasion on the expansion joint of the bridge in high and cold area, and ensure the normal use of the expansion joint.

[0006] 2. Technical scheme

[0007] To achieve the above purpose, the technical scheme provided by the present application is:

[0008] The expansion joint structure of prestressed assembly type bridge in arid alpine region of the present application comprises a prefabricated box girder and an expansion joint structure installed between two adjacent groups of prefabricated box girders, the expansion joint structure comprises a splicing assembly one, a splicing assembly two, a hot melt mechanism, a floating detector and a drainage mechanism;

[0009] The splicing assembly one and the splicing assembly two are fixed at the splicing position of the two adjacent groups of prefabricated box girders respectively, the hot melt mechanism, the floating detector and the drainage mechanism are provided with two groups, and the two groups of hot melt mechanism, floating detector and drainage mechanism are matched with the splicing assembly one and the splicing assembly two respectively;

[0010] The splicing assembly one comprises a splicing steel plate, an L-shaped bottom plate, a plugging assembly, a side plate and a sliding block, the inner end of the splicing steel plate is formed with a plurality of groups of butt protrusions, the butt protrusions of the two adjacent groups form a butt groove, the inner end of the butt groove is provided with a drainage port, and the plugging assembly is installed in the splicing steel plate and matched with the drainage port;

[0011] The side plate is provided with two groups and symmetrically installed on both sides of the splicing steel plate, the surface of the side plate is provided with a sliding groove, the sliding groove is provided with a sliding block, the splicing assembly two is the same as the splicing assembly one, and the sliding block on the splicing assembly two is connected with the sliding block on the splicing assembly one through an anchor rod;

[0012] The floating detector is installed on one set of butt blocks, and the floating detector comprises a column, a power supply wire, a conductive block, a float and a controller, the column is vertically fixed to the end of the butt block, the power supply wire is connected with the conductive block through the column, the conductive block is fixed to one side of the column, the float is sleeved on the lower end of the column and is connected with a contact piece above, and the contact piece is connected with the controller through a line;

[0013] The drainage mechanism comprises a drainage flow channel, a water pump and a drainage pipe, the drainage flow channel is located at the corner of the L-shaped bottom plate, the water inlet end of the water pump is connected with the drainage flow channel through a pipeline, and the water outlet end is connected with the drainage pipe, and the drainage pipe is vertically arranged on the side surface of the prefabricated box girder.

[0014] Further, the butt block and the butt groove are both triangular structures and are used in cooperation, and a plurality of sets of the butt grooves form expansion joints.

[0015] Further, a plurality of sets of the butt blocks are distributed in a zigzag manner, and the butt blocks on the first splicing assembly are correspondingly distributed with the butt grooves on the second splicing assembly.

[0016] Further, the L-shaped bottom plate is an L-shaped structure and comprises a vertical plate vertically fixed below the splicing steel plate and a horizontal plate horizontally arranged at the lower end of the vertical plate.

[0017] Further, the plugging assembly comprises a servo motor, a winding wheel, a traction line, a hanger and a plugging piece, the servo motor is installed on the side surface of the splicing steel plate and is connected with the controller through a line, the power output end of the servo motor is connected with the winding wheel, and one end of the traction line is wound on the winding wheel.

[0018] The hangers are evenly installed on the traction line, the hangers are located above the drainage port and are connected with the plugging piece at the bottom, and the plugging piece is used in cooperation with the drainage port.

[0019] Further, the plugging piece is made of rubber material and has a rectangular structure, and the size of the plugging piece is greater than that of the drainage port.

[0020] Further, the connection between the traction line and the hanger is a concave structure.

[0021] Further, the hot melting mechanism comprises a telescopic outer pipe, an electric cable and an electric heating plate, the telescopic outer pipe is installed on the side surface of the prefabricated box girder, the electric cable is built in the telescopic outer pipe and is connected with the electric heating plate, and the electric heating plate is embedded on the L-shaped bottom plate and is located directly below the butt groove.

[0022] The application discloses a method for a stretch joint structure of a prestressed assembly type bridge in an arid alpine region.

[0023] Further, when the temperature is low and ice exists in the stretch joint, the electric heating plate melts the ice in the butt joint groove, so that the ice is liquefied, and the liquid water is discharged in the above manner, and the normal operation of the stretch joint is ensured.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:

[0026] The application designs a stretch joint structure for a prestressed assembly type bridge in an arid alpine region. When icing occurs in the stretch joint position in a low-temperature environment, the ice can be melted by the melting mechanism, liquid water acts on the floating detector, the electrified drainage mechanism of the floating detector opens the drainage port in the stretch joint, and automatic drainage treatment can be performed, so that the bridge stretch joint in a high-cold region can be effectively prevented from being affected by icing or water intrusion, and normal use of the stretch joint is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a whole structure diagram of the application;

[0028] Figure 2 It is a local structure diagram of the splice assembly one of the application;

[0029] Figure 3 It is a structure diagram of the floating detector of the application;

[0030] Figure 4 It is a structure diagram of the blocking assembly of the application.

[0031] In the figure: 1, prefabricated box girder; 2, splicing assembly one; 3, splicing assembly two; 4, splicing steel plate; 5, L-shaped bottom plate; 6, plugging assembly; 7, side plate; 8, contact piece; 9, butt protrusion; 10, butt groove; 11, drainage port; 12, sliding groove; 13, sliding block; 14, telescopic outer tube; 15, cable; 16, electric heating plate; 17, stand; 18, power supply wire; 19, conductive protrusion; 20, float; 21, controller; 22, drainage flow channel; 23, water pump; 24, drain pipe; 25, vertical plate; 26, horizontal plate; 27, servo motor; 28, winding wheel; 29, traction line; 30, suspender; 31, plugging piece. DETAILED DESCRIPTION

[0032] The application will be further described below in conjunction with the drawings and examples:

[0033] Example 1

[0034] From Figures 1-4 It can be seen that the expansion joint structure of the prestressed assembly type bridge in the drought alpine region of the embodiment comprises prefabricated box girders 1 and an expansion joint structure installed between adjacent two groups of prefabricated box girders 1, the expansion joint structure comprises splicing assembly one 2, splicing assembly two 3, a hot melting mechanism, a floating detector and a drainage mechanism;

[0035] The splicing assembly one 2 and the splicing assembly two 3 are respectively fixed at the splicing positions of the adjacent two groups of prefabricated box girders 1, the hot melting mechanism, the floating detector and the drainage mechanism are each provided with two groups, and the two groups of hot melting mechanisms, floating detectors and drainage mechanisms are respectively matched with the splicing assembly one 2 and the splicing assembly two 3 for use;

[0036] The splicing assembly one 2 comprises a splicing steel plate 4, an L-shaped bottom plate 5, a plugging assembly 6, a side plate 7 and a sliding block 13, the inner end of the splicing steel plate 4 is formed with a plurality of groups of butt protrusions 9, the butt protrusions 9 between adjacent two groups form a butt groove 10, the inner end of the butt groove 10 is provided with a drainage port 11, and the plugging assembly 6 is installed in the splicing steel plate 4 and matched with the drainage port 11 for use;

[0037] The side plate 7 is provided with two groups and symmetrically installed on both sides of the splicing steel plate 4, the surface of the side plate 7 is provided with a sliding groove 12, the sliding groove 12 is slidably provided with a sliding block 13, the splicing assembly two 3 is the same as the splicing assembly one 2 in structure, and the sliding block 13 on the splicing assembly two 3 is connected with the sliding block 13 on the splicing assembly one 2 through an anchor rod;

[0038] The splicing assembly one 2 and the splicing assembly two 3 are in a splicing state under a normal state and can be self-adaptively adjusted;

[0039] The hot melt mechanism comprises a telescopic outer tube 14, a cable 15 and an electric heating plate 16, the telescopic outer tube 14 is installed on the side of the precast box girder 1, the cable 15 is embedded in the telescopic outer tube 14 and connected with the electric heating plate 16, and the electric heating plate 16 is embedded on the L-shaped bottom plate 5 and located directly below the docking groove 10.

[0040] The electric heating plate 16 performs hot melt treatment on the ice in the docking groove 10, so that the ice is liquefied.

[0041] The floating detector is installed on one group of the docking blocks 9, and comprises a stand 17, an electrified wire 18, a conductive block 19, a float 20 and a controller 21, the stand 17 is vertically fixed to the end of the docking block 9, the electrified wire 18 is connected with the conductive block 19 through the stand 17, the conductive block 19 is fixed to one side of the stand 17, the float 20 is embedded on the lower end of the stand 17 and connected with the contact sheet 8 above, and the contact sheet 8 is connected with the controller 21 through a line.

[0042] When there is liquid water in the docking groove 10, the float 20 moves upwards and drives the contact sheet 8 to move upwards synchronously, the contact sheet 8 is in contact with the conductive block 19 to form a path, and at this time, the controller 21 is opened and controls the operation of the plugging assembly 6 and the hot melt mechanism.

[0043] The drainage mechanism comprises a drainage flow channel 22, a water pump 23 and a drainage pipe 24, the drainage flow channel 22 is located at the corner of the L-shaped bottom plate 5, the water inlet end of the water pump 23 is connected with the drainage flow channel 22 through a pipeline and the water outlet end is connected with the drainage pipe 24, and the drainage pipe 24 is vertically arranged on the side of the precast box girder 1.

[0044] The liquid water is guided out through the drainage flow channel 22 and extracted through the water pump 23, and finally the water is discharged out through the drainage pipe 24.

[0045] The docking block 9 and the docking groove 10 are both in a triangular structure and used in cooperation, and a plurality of groups of the docking grooves 10 form expansion joints.

[0046] A plurality of groups of the docking blocks 9 are distributed in a sawtooth shape, the docking blocks 9 on the splicing assembly one 2 are correspondingly distributed with the docking grooves 10 on the splicing assembly two 3, so that splicing is facilitated.

[0047] The L-shaped bottom plate 5 is in an L-shaped structure and comprises a vertical plate 25 vertically fixed below the splicing steel plate 4 and a horizontal plate 26 horizontally arranged at the lower end of the vertical plate 25.

[0048] The plugging assembly 6 comprises a servo motor 27, a winding wheel 28, a traction line 29, a boom 30 and a plugging sheet 31, the servo motor 27 is installed on the side of the splicing steel plate 4 and connected with the controller 21 through a line, the power output end of the servo motor 27 is connected with the winding wheel 28, and one end of the traction line 29 is wound on the winding wheel 28.

[0049] The booms 30 are divided into several groups and evenly installed on the traction line 29. The booms 30 are located above the drain outlet 11 and their bottoms are connected to the sealing plate 31. The sealing plate 31 is used in conjunction with the drain outlet 11.

[0050] The servo motor 27 drives the winding wheel 28 to rotate. During the rotation, the winding wheel 28 winds up the traction line 29, keeping the traction line 29 taut. At this time, the boom 30 and the sealing plate 31 move upward, opening the drain outlet 11 to facilitate the external discharge of liquid water inside.

[0051] The sealing plate 31 is made of rubber and has a rectangular structure. The size of the sealing plate 31 is larger than that of the drain outlet 11, and it is used to open and close the drain outlet 11.

[0052] The connection between the traction line 29 and the boom 30 has a concave structure.

[0053] Under normal conditions, the traction line 29 is in a relaxed state, and the sealing plate 31 seals the drain outlet 11 to prevent dirt from entering the drain outlet 11. When it is necessary to open the drain outlet 11, the traction line 29 can be tightened to open the drain outlet 11.

[0054] A method for constructing an expansion joint structure for a prestressed prefabricated bridge in arid and cold regions, wherein in use: splicing component 1 2 and splicing component 2 3 are respectively installed at the ends of two adjacent sets of box girders. Under normal conditions, they are in a splicing state and can be adaptively adjusted. When there is liquid water inside the expansion joint, the float 20 moves upward and drives the contact piece 8 to move upward synchronously. The contact piece 8 contacts the conductive protrusion 19 to form a passage. At this time, the controller 21 is opened and controls the sealing component 6 to operate. The servo motor 27 drives the winding wheel 28 to rotate. During the rotation, the winding wheel 28 winds up the traction line 29, so that the traction line 29 is in a taut state. At this time, the hanger 30 and the sealing piece 31 move upward, so that the drain outlet 11 is open, which facilitates the external discharge of the internal liquid water. The liquid water is guided out through the drainage channel 22 and extracted by the water pump 23. Finally, the water is discharged out through the drain pipe 24 to prevent liquid water from entering the interior of the expansion joint and causing corrosion and damage.

[0055] When ice exists in the expansion joint at low temperatures, the electric heating plate 16 heats and melts the ice in the docking groove 10, causing the ice to liquefy, and drains the liquid water in the manner described above to ensure the normal operation of the expansion joint.

[0056] The purpose of the present application is to provide a kind of prestressed assembly type bridge expansion joint structure in arid alpine region, solve the temperature in alpine region frequently below freezing point, when water enters the inside of expansion joint, ice will be formed and expand under low temperature, this frost heaving phenomenon can cause the damage or failure of expansion joint, and when temperature rises, ice melts and becomes water, expansion joint can be invaded by water, cause corrosion and damage, thereby affect the use effect of expansion joint, lack the technical problem of corresponding processing means.

[0057] The present application designs a kind of expansion joint structure for prestressed assembly type bridge in arid alpine region, when expansion joint position appears icing condition in low temperature environment, ice can be handled by melting through hot melting mechanism, liquid water acts on floating detector, and floating detector energized drainage mechanism opens the drain opening in the inside of expansion joint, can carry out automatic drainage treatment, can effectively solve the influence of bridge expansion joint in alpine region on icing or water invasion, guarantee the normal use of expansion joint.

[0058] The above describes the present application and its embodiments in a schematic manner, which is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired thereby, without departing from the purpose of the present application, similar structural modes and embodiments can be designed without creativity, which shall belong to the protection scope of the present application.

Claims

1. An expansion joint structure for prestressed prefabricated bridges in arid and cold regions, comprising precast box girders (1) and expansion joint structures installed between two adjacent sets of precast box girders (1), characterized in that: The expansion joint structure includes splicing component one (2), splicing component two (3), hot-melt mechanism, floating detector and drainage mechanism; The splicing component one (2) and splicing component two (3) are respectively fixed at the splicing points of two adjacent precast box girders (1). The hot melt mechanism, floating detector and drainage mechanism are each provided in two sets. The two sets of hot melt mechanism, floating detector and drainage mechanism are used in conjunction with splicing component one (2) and splicing component two (3). The splicing component 1 (2) includes a splicing steel plate (4), an L-shaped base plate (5), a sealing component (6), a side plate (7), and a slider (13). The inner end of the splicing steel plate (4) is processed with several sets of mating protrusions (9). A mating groove (10) is formed between two adjacent sets of mating protrusions (9). A drain outlet (11) is opened at the inner end of the mating groove (10). The sealing component (6) is installed in the splicing steel plate (4) and is used in conjunction with the drain outlet (11). The side plate (7) is provided in two sets and is symmetrically installed on both sides of the splicing steel plate (4). The surface of the side plate (7) is provided with a sliding groove (12). A slider (13) is slidably arranged in the sliding groove (12). The splicing component two (3) has the same structure as the splicing component one (2). The slider (13) located on the splicing component two (3) is connected to the slider (13) located on the splicing component one (2) through an anchor rod. The floating detector is installed on one of the docking protrusions (9). The floating detector includes a column (17), a power line (18), a conductive protrusion (19), a float (20), and a controller (21). The column (17) is vertically fixed to the end of the docking protrusion (9). The power line (18) passes through the column (17) and is connected to the conductive protrusion (19). The conductive protrusion (19) is fixed to one side of the column (17). The float (20) is fitted into the lower end of the column (17) and has a contact piece (8) connected to the top. The contact piece (8) is connected to the controller (21) through a line. The drainage mechanism includes a drainage channel (22), a water pump (23), and a drainage pipe (24). The drainage channel (22) is located at the corner of the L-shaped base plate (5). The inlet end of the water pump (23) is connected to the drainage channel (22) through a pipe, and the outlet end is connected to the drainage pipe (24). The drainage pipe (24) is vertically installed on the side of the precast box girder (1). The sealing assembly (6) includes a servo motor (27), a winding reel (28), a traction line (29), a boom (30), and a sealing plate (31). The servo motor (27) is installed on the side of the splicing steel plate (4) and connected to the controller (21) via a line. The power output end of the servo motor (27) is connected to the winding reel (28), and one end of the traction line (29) is wound around the winding reel (28). The hanger rods (30) are arranged in groups and are uniformly installed on the traction line (29), the hanger rods (30) are located above the drainage port (11) and the bottom is connected with the sealing sheet (31), the sealing sheet (31) is used in cooperation with the drainage port (11); The connection part of the traction line (29) and the hanger rod (30) is in a concave structure; The hot melting mechanism comprises a telescopic outer pipe (14), a cable (15) and an electric heating plate (16), the telescopic outer pipe (14) is installed on the side of the prefabricated box girder (1), the cable (15) is embedded in the telescopic outer pipe (14) and is connected with the electric heating plate (16), the electric heating plate (16) is embedded on the L-shaped bottom plate (5) and is located directly below the butt joint groove (10).

2. The expansion joint structure of the prestressed fabricated bridge in the arid alpine region according to claim 1, characterized in that: The butt joint protrusions (9) and the butt joint grooves (10) are in a triangular structure and are used in cooperation, and a plurality of groups of the butt joint grooves (10) form the expansion joint.

3. The expansion joint structure of the prestressed fabricated bridge in the arid alpine region according to claim 2, characterized in that: A plurality of groups of the butt joint protrusions (9) are distributed in a zigzag shape, the butt joint protrusions (9) on the splicing assembly one (2) are distributed in correspondence with the butt joint grooves (10) on the splicing assembly two (3).

4. The expansion joint structure of the prestressed fabricated bridge in the arid alpine region according to claim 1, characterized in that: The L-shaped bottom plate (5) is in an L-shaped structure and comprises a vertical plate (25) vertically fixed below the splicing steel plate (4) and a horizontal plate (26) horizontally arranged at the lower end of the vertical plate (25).

5. The expansion joint structure of the prestressed fabricated bridge in the arid alpine region according to claim 1, characterized in that: The sealing sheet (31) is made of rubber material and is in a rectangular structure, and the size of the sealing sheet (31) is larger than that of the drainage port (11).

6. The method of claim 1, wherein the method is characterized by: In use: the splicing assembly one (2) and the splicing assembly two (3) are respectively installed at the end of the adjacent two groups of box girders, are in a splicing state in a normal state, and can be self-adaptively adjusted, when there is liquid water in the expansion joint, the float (20) moves up and drives the contact sheet (8) to move up synchronously, the contact sheet (8) is in contact with the conductive protrusion (19) to form a passage, at this time, the controller (21) is opened and controls the sealing assembly (6) to operate, the traction line (29) is wound by the servo motor (27) driving the winding wheel (28) to rotate, so that the traction line (29) is in a tight state, at this time, the hanger rod (30) and the sealing sheet (31) move up, so that the drainage port (11) is open, which is convenient for the external discharge treatment of the liquid water in the inside, the liquid water is externally guided through the drainage flow channel (22) and is extracted through the water pump (23), finally, the water is externally discharged through the drain pipe (24), so as to avoid the corrosion and damage caused by the liquid water entering the inside of the expansion joint.

7. The method of claim 6, wherein the method is characterized by: When there is ice in the expansion joint at low temperature, the electric heating plate (16) melts the ice in the butt joint groove (10), so that the ice is liquefied, and the liquid water is externally discharged in the above manner, so as to ensure the normal operation of the expansion joint.

Images