Bridge reinforcement device based on load transfer

Abstract

The present invention discloses a bridge reinforcement device based on load transfer, including a support system and a newly added beam body, the bottom of the newly added beam body is installed on the support system, the support system is installed on the cap beam, the top of the newly added beam body is against the bottom of the wet joint, and the top flange of the newly added beam body is against the flange of the original beam body. The beneficial effects of the present invention are: without changing the structure and bearing capacity of the original beam body, part of the new beam body is added, and part of the load borne by the original beam body is transferred to the new beam body, so that the original beam body meets the standards of the new design specifications, the original beam body and the newly added beam body both meet the design reference period of 100 years, and the newly added beam body can realize standardized design, factory production, on-site assembly and construction, short construction period, low engineering cost; the newly added beam body and the original beam body form a combined structure, jointly bear the bridge deck vehicle load, thereby improving the bearing capacity of the bridge.

Description

Technical Field

[0001] The invention relates to the technical field of bridge reinforcement, in particular to a bridge reinforcement device based on load transfer. Background Art

[0002] With the development of my country's economy, on the one hand, the axle load and traffic volume of automobiles are increasing. The bridges designed according to the General Specifications for Highway Bridge and Culvert Design (JTJ 021-89) and (JTG D60-2004) are facing the problem that the bearing capacity cannot meet the requirements of the current specification General Specifications for Highway Bridge and Culvert Design (JTG D60-2015). On the other hand, after long-term overload operation of the bridge, the bearing capacity of the original beam body has declined, and some original beam bodies have already developed transverse cracks and web inclined cracks. The reinforcement methods recommended by the Highway Bridge Reinforcement Design Specification (JTG / T J22-2008) include increasing the cross-section method, bonding fiber composite material method, external prestressing method and changing the system method. Its basic principle is to improve the bearing capacity of the beam body.

[0003] These reinforcement methods have the following shortcomings while improving the bearing capacity of bridges:

[0004] 1. There is some damage to the original structure;

[0005] 2. The durability of the bonded steel plates and fiber composite materials cannot be guaranteed;

[0006] 3. The purpose of reinforcement is generally to restore the bearing capacity of the bridge. It is generally difficult to improve the design standards;

[0007] 4. The construction period is generally long;

[0008] 5. The construction process affects the operation of the expressway. Summary of the invention

[0009] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a bridge reinforcement device based on load transfer, which adds part of the new beam without changing the structure and bearing capacity of the original beam, and transfers part of the load borne by the original beam to the new beam, so that the original beam meets the standards of the new design specifications.

[0010] The objective of the present invention is achieved through the following technical scheme: a bridge reinforcement device based on load transfer, comprising a support system and a newly added beam, the bottom of the newly added beam being installed on the support system, the support system being installed on the cap beam, the top of the newly added beam being pressed against the bottom of the wet joint, and the top flange of the newly added beam being pressed against the flange of the original beam.

[0011] Preferably, the top surface of the newly added beam is a curved surface, and the newly added beam transfers load to the original beam through the support system in the form of concentrated force, uniform force, or quadratic curve distribution force.

[0012] Preferably, the support system adopts a self-slope lifting support, which includes a self-slope device and a lifting support device. The lifting support device includes a leveling bolt and a lifting steel plate. The leveling bolt is installed in the support pedestal stone, and the support pedestal stone is cast on the cap beam. The lifting steel plate is slidably installed on the leveling bolt and is limited by a limit nut installed on the leveling bolt. The self-slope device is installed on the lifting steel plate.

[0013] Preferably, the self-slope adjusting device includes a slope adjusting steel plate, a pad, a rubber bearing and a slide seat, a spherical portion is provided at the bottom of the slope adjusting steel plate, a spherical groove matching the spherical portion is provided at the top of the pad, and the top of the pad does not contact the bottom of the slope adjusting steel plate, the slide seat is installed on the jacking steel plate, a slide groove is provided on the slide seat, the top of the rubber bearing is installed on the bottom of the pad, and the bottom of the rubber bearing is located in the slide groove, and a slide plate is also installed between the rubber bearing and the slide groove.

[0014] Preferably, the bottom edge of the slope-adjusting steel plate is provided with a limiting plate, and the end portions of the limiting plates are connected in sequence to form a closed ring.

[0015] Preferably, it also includes a reinforcement component, which includes a crossbeam, a support frame and a support plate. The support frame is installed on the side wall of the original beam body close to the newly added beam body, and the support plate is installed on the support frame. One end of the crossbeam is fixedly installed on the support plate, and the other end of the crossbeam is fixed on the web of the newly added beam body.

[0016] Preferably, the newly added beam body also includes an upper flange plate and a lower flange plate, the upper flange plate is installed on the top of the web plate, the lower flange plate is installed on the bottom of the web plate, and the lower flange plate is fixed on the slope adjustment steel plate, and a plurality of reinforcing ribs A are arranged on the web plate at intervals, and the upper and lower ends of the reinforcing ribs A are respectively pressed against the corresponding upper flange plate and lower flange plate, and reinforcing ribs B are laterally arranged on some of the reinforcing ribs A.

[0017] Preferably, a shear nail group is installed on the upper flange plate, the shear nail group consists of a plurality of shear nails, and the shear nails are located in the wet joint.

[0018] Preferably, the newly added beam body and the flange of the original beam body are connected to form an integral structure by gluing or shear nails.

[0019] Preferably, the newly added beam is a steel plate beam, and the original beam is a box beam or a T beam.

[0020] The present invention has the following advantages: the bridge reinforcement device of the present invention adds part of the new beam without changing the structure and bearing capacity of the original beam, transfers part of the load borne by the original beam to the new beam, so that the original beam meets the standards of the new design specifications, and both the original beam and the newly added beam meet the design reference period of 100 years. Compared with the existing bridge reinforcement device, it has the following advantages:

[0021] 1. The newly added beam can realize standardized design, factory production, and on-site assembly and construction;

[0022] 2. No damage or slight damage to the original designed beam;

[0023] 3. Good durability, and can reach the 100-year design reference period together with the original beam;

[0024] 4. Short construction period and low engineering cost;

[0025] 5. It has a wide range of applications and can meet the requirements for improving the bearing capacity of bridges with unchanged design standards, as well as the requirements for improving bridge design standards;

[0026] 6. Little impact on highway operations;

[0027] 7. The bridge reinforcement device based on load transfer forms a combined structure with the original beam body to jointly bear the bridge deck vehicle load, thereby improving the bridge's bearing capacity;

[0028] 8. The bridge reinforcement device based on load transfer can share the dead load of the original beam body, and the bridge reinforcement device based on load transfer has an independent support system, which can directly transfer the increased load to the bridge pier without passing through the original beam body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 It is the structural schematic diagram of the steel plate beam;

[0031] Figure 3 for Figure 2 Schematic diagram of middle II;

[0032] Figure 4 for Figure 2 Schematic diagram of the structure of II-II;

[0033] Figure 5 for Figure 2 Schematic diagram of the structure of III-III;

[0034] Figure 6 It is a structural schematic diagram of the reinforcement component;

[0035] Figure 7The structural diagram of the self-adjusting slope lifting support

[0036] Figure 8 It is a structural schematic diagram of the slope adjustment steel plate;

[0037] Fig. 9 is a schematic diagram of the structure of the pad;

[0038] Fig.10 This is a schematic diagram of the installation of the jack;

[0039] In the figure, 1-original beam, 2-newly added beam, 3-reinforcement component, 4-self-adjusting slope jacking support, 5-wet joint, 21-upper flange plate, 22-lower flange plate, 23-web plate, 24-strengthening rib A, 25-strengthening rib B, 26-shear nail, 31-cross beam, 32-support frame, 33-support plate, 41-slope adjustment steel plate, 42-pad, 43-rubber support, 44-slide plate, 45-slide seat, 46-lifting steel plate, 47-slide groove, 48-leveling bolt, 49-limit nut, 50-limit plate, 51-spherical part, 52-spherical groove. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] like Figure 1 As shown, the bridge reinforcement device based on load transfer includes a support system and a newly added beam 2. The bottom of the newly added beam 2 is installed on the support system, and the support system is installed on the cap beam. Therefore, the newly added beam 2 is connected to the cap beam of the pier or abutment through the support system to transfer the load of the newly added beam. The top of the newly added beam 2 is against the bottom of the wet joint 5, and the top flange of the newly added beam 2 is against the flange of the original beam 1. By adding a new beam 2, without changing the structure and bearing capacity of the original beam 1, part of the new beam 2 is added, and part of the load borne by the original beam 1 is transferred to the new beam 2, so that the original beam 1 meets the standards of the new design specifications. In this embodiment, the newly added beam can be a steel plate beam, but is not limited to a steel plate beam. Preferably, the newly added beam 2 is a steel plate beam, and the original beam 1 is a box beam or a T beam.

[0047] In this embodiment, the top surface of the newly added beam is a curved surface, and the newly added beam transfers the load to the original beam through the support system in the form of concentrated force, uniform force, or quadratic curve distributed force. In actual use, it is necessary to inspect the appearance of the bridge, and then use a suitable load transfer method to repair and reinforce the bridge according to the crack area of ​​the bridge.

[0048] Specifically, if there are oblique cracks in the support area, it means that the support reaction and shear force are insufficient. At this time, the concentrated load transfer method is adopted. The top surface of the newly added beam body 2 is designed to be a plane, and the top surface of the newly added beam body 2 is parallel to the flange of the original beam body 1. The top surface of the newly added beam body 2 and the flange of the original beam body 1 are in parallel contact. According to the preset transfer load size, a lifting force is applied to the newly added beam body 2, and the lifting force is transmitted to the flange of the original beam body 1 in the form of concentrated force, reducing the support reaction and shear force of the original beam body 1, thereby increasing the bearing capacity of the original beam body 1, so that the original beam body 1 and the newly added beam body jointly bear the bridge deck vehicle load, thereby improving the bearing capacity of the bridge.

[0049] If cracks appear at the lower edge of the web of the original beam 1, it means that the bending resistance of the original beam 1 is insufficient. At this time, the uniformly distributed load transfer method is used. The top surface of the newly added beam 2 is made into a quadratic surface. According to the preset transfer load size, a lifting force is applied to the newly added beam 2. During the lifting process, the mid-span of the newly added beam 2 first contacts the flange of the original beam 1. As the lifting force gradually increases, the newly added beam 2 gradually deforms, and the contact surface extends from the mid-span to both sides until it is completely in contact. Therefore, a uniformly distributed load is applied to the flange of the original beam 1 through the curved surface of the newly added beam 2, reducing the mid-span bending moment of the original bridge, the shear force in the support area, and the reaction force of the support. Then, the newly added beam 2 and the original beam 1 form a combined structure to jointly bear the bridge deck vehicle load, thereby improving the bearing capacity of the bridge. Furthermore, when the uniformly distributed load is transferred between the newly added beam 2 and the original beam 1, the top curved surface of the newly added beam 2 and the transferred load satisfy the following relationship:

[0050]

[0051] Where: q represents the uniformly distributed load per unit length, unit: kN / m;

[0052] L represents the length of the steel beam, unit: m;

[0053] μ represents the ratio of the x coordinate to the beam length L;

[0054] y represents the deflection of the steel beam at the x position from the beam end, unit: m;

[0055] E represents the elastic modulus of the steel beam, unit: MPa;

[0056] I represents the moment of inertia of the steel beam section, unit: m 4 .

[0057] If cracks appear in the mid-span area of ​​the original beam 1 and the mid-span deflection occurs, it means that the bending resistance of the mid-span area of ​​the original beam 1 is insufficient. At this time, the quadratic parabola load transfer method is used to make the newly added beam 2 into a high-order curved surface. According to the preset transfer load size, a lifting force is applied to the newly added beam 2. During the lifting process, the newly added beam 2 first contacts the flange of the original beam 1 at the mid-span. As the lifting force gradually increases, the newly added beam gradually deforms, and the contact surface extends from the mid-span to both sides until it is completely in contact. The transfer load applies a quadratic curve load to the flange of the original beam 1 through the curved surface of the newly added beam 2, reducing the bending moment of the entire mid-span of the original bridge, the shear force in the support area, and the reaction force of the support; the newly added beam 2 and the original beam 1 form a combined structure, jointly bearing the bridge deck vehicle load, thereby improving the bearing capacity of the bridge; further, when the newly added beam and the original beam are transferred by a quadratic curve distribution force load, the top curved surface of the newly added beam 2 and the transfer load satisfy the following relationship:

[0058]

[0059] Where: q represents the uniformly distributed load per unit length, unit: kN / m;

[0060] L represents the length of the steel beam, unit: m;

[0061] μ represents the ratio of the x coordinate to the beam length L;

[0062] y represents the deflection of the steel beam at the x position from the beam end, unit: m;

[0063] E represents the elastic modulus of the steel beam, unit: MPa;

[0064] I represents the moment of inertia of the steel beam section, unit: m 4 .

[0065] In this embodiment, the newly added beam body 2 and the flange of the original beam body 1 are connected to form an integral structure by adhesive or shear nails. Furthermore, the top surface of the newly added beam body 2 is coated with polymer elastic mortar. During the jacking process of the newly added beam body 1, the polymer inelastic mortar can be squeezed out, and the polymer elastic mortar can fill the gap between the newly added beam body 2 and the original beam body 1, thereby ensuring uniform transmission of the jacking force.

[0066] In this embodiment, the connection between the newly added beam body 2 and the flange part of the original beam body 1 is connected by applying a preset pressure by the support system, so that a pair of reaction forces are formed between the contact surface of the newly added beam body 2 and the original beam body 1. The original beam body 1 bears the force opposite to the original load direction to achieve unloading, and the newly added beam body 1 bears the force consistent with the load direction to achieve load transfer. Furthermore, the support system adopts a self-adjusting slope jacking support 4, such as Figure 7As shown, the self-adjusting jacking support 4 includes a self-adjusting device and a jacking support device, and the jacking support device includes a leveling bolt 48 and a jacking steel plate 46. It is installed in the support cushion stone, and the support cushion stone is cast on the cap beam. When the support cushion stone is cast, the leveling bolt 48 is buried in the support cushion stone, and the jacking steel plate 46 is slidably installed on the leveling bolt 48. There are multiple leveling bolts 48. Preferably, there are four leveling bolts 48, which are respectively located at the four corners of the jacking steel plate 46. Through holes are opened on the four corners of the jacking steel plate 46, and the leveling bolts 48 are passed through the through holes, and limiting nuts 49 are threadedly installed on the leveling bolts 48. When the jacking steel plate 46 is installed, the leveling steel plate is limited by the limiting nuts 49 installed on the leveling bolts 48. By adjusting the position of the limiting nuts 49, the jacking steel plate 46 can be leveled, thereby ensuring the water level of the jacking steel plate 46. Flatness, during the jacking process, the jacking equipment is a jack, which is placed in the cavity between the jacking steel plate 46 and the support pad stone, and then the jack works to push the jacking steel plate 46 upward, so that the newly added beam 2 moves upward, and finally the top flange of the newly added beam 2 is pressed against the bottom of the wet joint 5 and the flanges of the two adjacent original beams 1, and the wet joint 5 and the flanges of the original beam 1 are subjected to an upward jacking force, but the jacking force is not enough to change the position of the wet joint 5 and the original beam 1, but when the vehicle is driving on the bridge, the original beam 1 and the wet joint 5 will be subjected to a downward pressure, and at this time the original beam 1 and the wet joint 5 are subjected to an upward jacking force, so the jacking force and pressure offset each other, so that the original beam 1 The resultant force on the wet joint 5 becomes smaller, thereby improving the bearing capacity of the original beam body 1 and the wet joint 5. When the newly added beam body 2 meets the requirements, the limit nut 49 is tightened, and then the vertical height of the jacking steel plate 46 is fixed. Then the jack is taken out and concrete is filled in the cavity between the jacking steel plate 46 and the support pad stone. Preferably, the top surface of the concrete is flush with the top surface of the jacking steel plate 46.

[0067] In this embodiment, the self-slope adjustment device is installed on the jacking steel plate 46. Figure 7 As shown, the self-slope adjustment device includes a slope adjustment steel plate 41, a pad 42, a rubber support 43 and a slide seat 45. Figure 8 As shown, a spherical portion 51 is provided at the bottom of the slope adjustment steel plate 41. Fig. 9As shown, a spherical groove 52 cooperating with the spherical portion 51 is provided on the top of the pad 42, and the top of the pad 42 does not contact the bottom of the slope-adjusting steel plate 41. Through the cooperation between the spherical portion 51 and the spherical groove 52, the spherical portion 51 can rotate 360 ​​degrees in the spherical groove 52. Furthermore, the spherical portion 51 is commonly a spherical crown or a spherical hinge. When the slope-adjusting steel plate 41 is subjected to force, the slope-adjusting steel plate 41 can automatically deflect, so that the slope can be self-adjusted as the force changes. Moreover, through the cooperation between the spherical portion 51 and the spherical groove 52, the pad 42 can be subjected to uniform force, thereby avoiding excessive local force on the pad 42, thereby ensuring the service life of the pad 42.

[0068] In this embodiment, the slide 45 is installed on the jacking steel plate 46, and a slide groove 47 is opened on the slide 45. The top of the rubber support 43 is installed on the bottom of the pad 42, and the bottom of the rubber support 43 is located in the slide groove 47. A slide plate 44 is also installed between the rubber support 43 and the slide groove 47. The slide plate 44 is made of stainless steel. When the slope-adjusting steel plate 41 is subjected to force, the rubber support 43 can be deformed, so that the rubber support 43 is close to the slide plate 44. Preferably, the slide plate 44 has a sliding gap at the front, back, left and right. Therefore, during the expansion and contraction process of the bridge, the slide plate 44 can slide according to the direction of force, so that the entire self-slope-adjusting device can adapt to various weather changes and increase its applicability.

[0069] In this embodiment, a limiting plate 50 is provided at the bottom edge of the slope-adjusting steel plate 41. The limiting plate 50 can prevent the slope-adjusting steel plate 41 from sliding out of the spherical groove 52 during the rotation and deflection process, thereby ensuring the stability and reliability of the support pad 42. Furthermore, the end portions of the limiting plates 50 are connected in sequence to form a closed ring. The commonly used limiting plates 50 form a "mouth" shape or a circular ring shape, so that the bottom of the slope-adjusting steel plate 41 is surrounded by limiting plates 50. Therefore, the self-slope-adjusting device can be applied to installation environments with horizontal slopes and longitudinal slopes.

[0070] In this embodiment, if Figure 1 As shown, the bridge reinforcement device based on load transfer also includes a reinforcement component 3, such as Figure 6 As shown, the reinforcement assembly 3 includes a crossbeam 31, a support frame 32 and a support plate 33. The support frame 32 is installed on the side wall of the original beam body 1 close to the newly added beam body 2, and the support plate 33 is installed on the support frame 32. One end of the crossbeam 31 is fixedly installed on the support plate 33, and the other end of the crossbeam 31 is fixed on the web 23 of the newly added beam body 2. Further, as shown in FIG. Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the newly added beam body 2 also includes an upper flange plate 21 and a lower flange plate 22, the upper flange plate 21 is installed on the top of the web plate 23, the lower flange plate 22 is installed on the bottom of the web plate 23, and the lower flange plate 22 is fixed on the slope adjustment steel plate 41, the upper flange plate 21, the lower flange plate 22 and the web plate 23 are all connected by welding, and the upper flange plate 21 and the lower flange plate 22 form an I-shape, preferably, both sides of the web plate 23 are installed with reinforcement components 3, when installing the reinforcement components 3, anchor bolts are installed on the original beam body 1, When the bridge is under construction, the anchor bolts are directly buried in the original beam body 1 when the original beam body 1 is cast. When the bridge is reinforced and repaired, holes are opened on the side walls of the original beam body 1, and then the anchor bolts are installed in the holes. When installing the anchor bolts, adhesives are needed to ensure that the anchor bolts and the original beam body 1 are firmly installed. Through holes are opened on the support plate 33, and the support plate 33 is installed on the anchor bolts, and then locked with nuts. The support frame 32 is welded to the support plate 33, and a groove is opened on the support frame 32. The groove can facilitate the installation of the cross beam 31. The distance between the bottom of the groove and the web 23 is measured, and then one end of the cross beam 31 of the corresponding size is installed in the groove. The groove can support the cross beam 31, so as to facilitate welding by welders. When the position of the cross beam 31 is installed, the two ends of the cross beam 31 are welded to the corresponding support frame 32 and the web 23. Welding. In this embodiment, the number of reinforcement components 3 is determined according to the size of the newly added beam body 2. When the size of the newly added beam body 2 is relatively long, such as 20 meters, the reinforcement components 3 are installed at 1 / 4, 2 / 4, and 3 / 4 of the newly added beam body 2. When the size of the newly added beam body 2 is relatively short, such as 8 meters, the reinforcement components 3 are directly installed in the middle position of the newly added beam body 2. The reinforcement components 3 can increase the structural strength of the newly added beam body 2, avoid deformation of the newly added beam body 2, and ensure the service life and bearing capacity of the newly added beam body 2. The newly added beam body 2 is reinforced by the reinforcement components 3 without changing the structural system of the original beam body 1 and increasing the bearing capacity of the original beam body. The entire reinforcement process causes no damage or slight damage to the original beam body 1, and does not affect the service life of the original beam body.

[0071] In this embodiment, a plurality of reinforcing ribs A24 are arranged at intervals on the web 23, and the upper and lower ends of the reinforcing ribs A24 are respectively pressed against the corresponding upper flange plate 21 and lower flange plate 22. Reinforcing ribs B25 are transversely arranged on some of the reinforcing ribs A24. Both the reinforcing ribs A24 and the reinforcing ribs B25 can increase the structural strength of the newly added beam body 2, thereby increasing the bearing capacity of the newly added beam body 2.

[0072] In this embodiment, a group of shear nails 26 is installed on the upper flange plate 21, and the shear nail 26 group consists of a plurality of shear nails 26, and the shear nails 26 are located in the wet joint 5. When the bridge is a newly built bridge, the shear nails 26 are directly welded to the upper flange plate 21, and then the wet joint 5 is cast, and the shear nails 26 are cast in the wet joint 5. When used for repairing and reinforcing the bridge, a plurality of holes are opened on the upper flange plate 21, and then holes for installing the shear nails 26 are opened on the wet joint 5. Finally, the shear nails 26 are installed in the holes of the wet joint 5 of the upper flange plate 21, and the gaps between the shear nails 26 and the holes are filled with adhesive. The shear nails 26 can ensure the contact performance between the upper flange plate 21 and the wet joint 5, so that the internal stress generated by the wet joint 5 during the expansion and contraction process can be effectively and timely transmitted to the upper flange plate 21, so that the self-slope adjustment device can be adjusted in time.

[0073] The bridge reinforcement device based on load transfer takes the steel plate beam as an example to illustrate its construction method, which includes the following steps:

[0074] S1: Casting in one step, casting a support pedestal stone on the cap beam between two adjacent original beam bodies 1, and pre-embedding a plurality of leveling bolts 48 in the support pedestal stone. Preferably, there are four leveling bolts 48, which are evenly distributed on the four corners of the jacking steel plate 46;

[0075] S2: Install the jacking steel plate 46, install the jacking steel plate 46 on the leveling bolt 48, and support and limit it through the limit nut 49, and then adjust the limit nut 49 to ensure the horizontality of the jacking steel plate 46. Here, the horizontality of the jacking steel plate 46 needs to be ensured. During the specific construction, a level ruler should be used for measurement;

[0076] S3: Install the self-slope adjustment device, weld the slide 45 to the jacking steel plate 46, then place the slide plate 44 in the slide groove 47 of the slide 45, place the rubber bearing 43 on the slide plate 44, then install the pad 42 on the rubber bearing 43, and then install the slope adjustment steel plate 41 on the pad 42, and make the spherical part 51 fit in the spherical groove 52; the slide 45, rubber bearing 43, pad 42, and slope adjustment steel plate 41 are all directly manufactured in the factory, and then transported to the bridge repair site, and directly assembled by the construction personnel. During installation, it is necessary to ensure that the center of gravity of the slide 45, rubber bearing 43, pad 42 and slope adjustment steel plate 41 coincides with the center of gravity of the jacking steel plate 46 as much as possible;

[0077] S4: Assemble the newly added beam 2. According to the bridge deck conditions, manufacture the upper flange plate 21, the lower flange plate 22 and the web plate 23 in the factory, and then assemble the upper flange plate 21, the lower flange plate 22 and the web plate 23 by welding, so that the upper flange plate 21, the lower flange plate 22 and the web plate 23 form an I-shape, and then weld the reinforcing rib A24 and the reinforcing rib B25 on the web plate 23 according to the actual situation to improve the structural strength of the newly added beam 2;

[0078] S5: Install the newly added beam body 2, fix the newly added beam body 2 assembled in S4 on the slope-adjusting steel plate 41, and apply polymer elastic mortar on the upper flange plate 21. Preferably, the lower flange plate 22 of the newly added beam body 2 is welded to the slope-adjusting steel plate 41, and the self-adjusting slope-lifting support 4 is installed on the cap beam. Therefore, both ends of the newly added beam body 2 are installed on the slope-adjusting steel plate 41, that is, the entire newly added beam body 2 is supported by the self-adjusting slope-lifting supports 4 at both ends. It is not easy to apply the polymer elastic mortar too early. When the newly added beam body 2 needs to be lifted, the polymer elastic mortar is applied. The polymer elastic mortar can ensure that the upper flange plate 21 is in full contact with the wet joint 5 and the flange of the original beam body 1, thereby ensuring the uniform transmission of the lifting force.

[0079] S6: Lift the newly added beam 2, place a jack between the lifting steel plate 46 and the support pad stone, and then the jack works to push the upper flange plate 21 against the bottom of the wet joint 5, and the top flange of the upper flange plate 21 against the flanges of the two adjacent original beams 1. When the lifting force reaches the set requirement, tighten the leveling bolts 48 to ensure the position of the newly added beam 2, thereby ensuring the size of the lifting force;

[0080] S7: Install the reinforcement component 3, install the support plate 33 on the side wall of the original beam body 1, and then fix the support frame 32 on the support plate 33, and weld the two ends of the crossbeam 31 to the corresponding support plate 33 and the web 23 respectively. When installing the support plate 33, it is necessary to open a mounting hole on the side wall of the original beam body 1, and then install the anchor bolt in the mounting hole. When installing the anchor bolt, it is necessary to fill the mounting hole with adhesive to ensure the installation stability of the anchor bolt;

[0081] S8: Secondary pouring, remove the jack, and pour concrete again on the support pad stone, so that the concrete fills the cavity of the jacking steel plate 46 and the support pad stone. Preferably, the surface of the concrete should be flush with the surface of the jacking steel plate 46, so as to improve the stability of the jacking steel plate 46.

[0082] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bridge reinforcement device based on load transfer, characterized in that: It comprises a support system and a newly added beam body, wherein the bottom of the newly added beam body is installed on the support system, the support system is installed on the cap beam, the top of the newly added beam body is against the bottom of the wet joint, and the top flange of the newly added beam body is against the flange of the original beam body, the top surface of the newly added beam body is a curved surface, and the newly added beam body transfers loads between the support system and the original beam body in the form of concentrated force, uniform force, or quadratic curve distribution force; If cracks appear at the lower edge of the web of the original beam, the uniform load transfer method is used. When the uniform force load is transferred between the new beam and the original beam, the top curved surface of the new beam and the transferred load satisfy the following relationship: If cracks appear in the mid-span area of ​​the original beam, the quadratic parabola load transfer method is used. When the load is transferred between the newly added beam and the original beam using a quadratic curve distribution force, the top surface of the newly added beam and the transferred load satisfy the following relationship: Where: q represents the uniformly distributed load per unit length, unit: kN / m; L represents the length of the steel beam, unit: m; μ represents the ratio of the x coordinate to the beam length L; y represents the deflection of the steel beam at the x position from the beam end, unit: m; E represents the elastic modulus of the steel beam, unit: MPa; I represents the moment of inertia of the steel beam section, unit: m 4 ; The support system adopts a self-slope-adjusting jacking support, which includes a self-slope-adjusting device and a jacking support device. The jacking support device includes a leveling bolt and a jacking steel plate. The leveling bolt is installed in a support pedestal stone, and the support pedestal stone is cast on the cap beam. The jacking steel plate is slidably installed on the leveling bolt and is limited by a limit nut installed on the leveling bolt. The self-slope-adjusting device is installed on the jacking steel plate.

2. The bridge reinforcement device based on load transfer according to claim 1 is characterized in that: The self-slope-adjusting device includes a slope-adjusting steel plate, a pad, a rubber bearing and a slide seat. The bottom of the slope-adjusting steel plate is provided with a spherical portion, the top of the pad is provided with a spherical groove that cooperates with the spherical portion, and the top of the pad is not in contact with the bottom of the slope-adjusting steel plate. The slide seat is installed on the jacking steel plate, and a slide groove is provided on the slide seat. The top of the rubber bearing is installed on the bottom of the pad, and the bottom of the rubber bearing is located in the slide groove. A slide plate is also installed between the rubber bearing and the slide groove.

3. The bridge reinforcement device based on load transfer according to claim 2 is characterized in that: The bottom edges of the slope-adjusting steel plates are all provided with limiting plates, and the ends of the limiting plates are sequentially connected to form a closed ring.

4. The bridge reinforcement device based on load transfer according to any one of claims 1 to 3, characterized in that: It also includes a reinforcement component, which includes a crossbeam, a support frame and a support plate. A support frame is installed on the side wall of the original beam body close to the newly added beam body, and a support plate is installed on the support frame. One end of the crossbeam is fixedly installed on the support plate, and the other end of the crossbeam is fixed on the web of the newly added beam body.

5. The bridge reinforcement device based on load transfer according to claim 4 is characterized in that: The newly added beam body also includes an upper flange plate and a lower flange plate, the upper flange plate is installed on the top of the web plate, the lower flange plate is installed on the bottom of the web plate, and the lower flange plate is fixed on the slope adjustment steel plate. A plurality of reinforcing ribs A are arranged at intervals on the web plate, and the upper and lower ends of the reinforcing ribs A are respectively pressed against the corresponding upper flange plate and the lower flange plate, and reinforcing ribs B are transversely arranged on some of the reinforcing ribs A.

6. The bridge reinforcement device based on load transfer according to claim 5 is characterized in that: A shear nail group is installed on the upper flange plate, the shear nail group consists of a plurality of shear nails, and the shear nails are located in the wet joint.

7. The bridge reinforcement device based on load transfer according to claim 6 is characterized in that: The newly added beam body and the flange of the original beam body are connected to form an integral structure by gluing or shear nails.

8. The bridge reinforcement device based on load transfer according to claim 7 is characterized in that: The newly added beam body is a steel plate beam, and the original beam body is a box beam or a T beam.

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