A reinforced structure and construction method for increasing the cross-section of the arch rib of a steel tube concrete arch bridge

Abstract

The embodiment of the present application provides a reinforced structure and construction method for increasing the cross-section of the arch rib of a steel tube concrete arch bridge, which belongs to the technical field of steel tube concrete arch bridges. The reinforced structure is used to reinforce the original arch rib, and the reinforced structure includes an outer steel and a filling part. The outer steel includes a first substrate and a second substrate. The first substrate and the second substrate are connected to each other so that the outer steel is sleeved on the outer peripheral side of the original arch rib, and there is a spacing between the inner wall of the outer steel and the outer wall of the original arch rib, so that a filling space is formed between the outer steel and the original arch rib; the filling part is filled in the filling space, and the filling part is used to connect the outer steel and the original arch rib as a whole; wherein, an adjustment component is provided on the outer steel, and the adjustment component is used to adjust the relative position of the outer steel and the original arch rib. This reinforced structure for increasing the cross-section of the arch rib of a steel tube concrete arch bridge can increase the bearing capacity and overall stiffness of the arch bridge, and increase the safety factor of the arch bridge.

Description

Technical Field

[0001] The present application relates to the technical field of steel tube concrete arch bridges, and in particular to a steel tube concrete arch bridge arch rib cross-section enlargement reinforcement structure and a construction method. Background Art

[0002] The steel tube concrete arch bridge is a unique steel-concrete composite bridge with beautiful shape, reasonable structure and convenient construction. The steel tube concrete arch rib is the main load-bearing component of the arch bridge, and the quality of the arch rib is directly related to the bearing capacity and stability of the entire bridge. The advantage of the steel tube concrete arch rib is that the hoop effect of the outer steel pipe can improve the bearing capacity of the concrete, the inner filling concrete constrains the outer steel pipe, prevents the local buckling of the steel pipe and improves the local stability of the steel pipe, and the inner wall of the steel pipe is bonded with the concrete to form a force-bearing whole.

[0003] Due to the difference in concrete and steel pipe materials, local climatic conditions, and problems with construction technology and construction quality control, the concrete and steel pipe in the pipe may be hollowed out, resulting in gaps and hollows. Other common diseases of arch ribs include steel pipe corrosion and welding cracks. Steel pipe corrosion is mainly caused by the surface coating of the steel pipe due to collisions during the construction process or coating quality problems, which causes surface cracking, peeling, and flaking, and eventually the steel pipe is corroded by rain and air. Welding cracks are mainly caused by welding technology and welding quality problems. Welding defects may cause fatigue cracks in steel pipes, and eventually lead to fatigue failure of steel pipes. Under the combined action of stress and corrosive media, welding cracks may develop rapidly, endangering the safety performance of the bridge. At present, the main methods for local reinforcement of steel tube concrete arch ribs are secondary grouting method, external sleeve ring method, etc., and the method for overall reinforcement of steel tube concrete arch ribs remains to be studied. Summary of the invention

[0004] The embodiment of the present application provides a steel tube concrete arch bridge arch rib enlarged cross-section reinforcement structure and a construction method, which can increase the bearing capacity and overall stiffness of the arch bridge and increase the safety factor of the arch bridge.

[0005] In the first aspect, an embodiment of the present application provides a reinforcement structure for increasing the cross-section of the arch rib of a steel tube concrete arch bridge, the reinforcement structure being used to reinforce the original arch rib, the reinforcement structure comprising an outer cladding steel and a filling portion, the outer cladding steel comprising a first substrate and a second substrate, the first substrate and the second substrate being mutually enclosed and connected so that the outer cladding steel can be sleeved on the outer peripheral side of the original arch rib, and there is a spacing between the inner wall of the outer cladding steel and the outer wall of the original arch rib so as to form a filling space between the outer cladding steel and the original arch rib; the filling portion is filled in the filling space, and the filling portion is used to connect the outer cladding steel and the original arch rib as a whole; wherein an adjustment component is provided on the outer cladding steel, and the adjustment component is used to adjust the relative position of the outer cladding steel and the original arch rib.

[0006] In the present solution, the outer clad steel is made into a split assembly type by including the first substrate and the second substrate, that is, the first substrate and the second substrate can be separated and combined with each other, so that the outer clad steel is sleeved on the outer peripheral side of the original arch rib, and then the position of the outer clad steel relative to the original arch rib is finely adjusted by the adjusting component, thereby realizing precise control of the outer clad steel during the installation process and ensuring the engineering quality of the reinforced structure. In addition, the adjusting component can adjust the filling space between the outer clad steel and the original arch rib, and then the outer clad steel and the original arch rib are connected as a whole by filling the filling part, thereby ensuring the stability of the outer clad steel and significantly reinforcing the original arch rib.

[0007] In some embodiments, the cross-sectional shapes of the first substrate and the second substrate are both C-shaped, and an adjustment bracket is provided on the adjacent sides of the first substrate and the second substrate, and a first bolt hole is provided on the adjustment bracket; the adjustment assembly includes a first bolt, and the first bolt passes through the first bolt hole on the first substrate and the second substrate and is locked by a first nut to connect the first substrate and the second substrate.

[0008] In the above technical solution, the cross-sectional shapes of the first substrate and the second substrate are both C-shaped, that is, the first substrate and the second substrate are both processed into a C-shape or a U-shape by steel plates according to the outer contour of the original arch rib, and an adjustment bracket is provided on the adjacent side of the first substrate and the second substrate. By using the first bolt in the adjustment component, the first bolt passes through the first bolt hole on the first substrate and the second substrate and is locked by the first nut, so that the first substrate and the second substrate can be connected, and the first substrate and the second substrate can be temporarily fixed, which is convenient for the outer steel to be installed on the original arch rib. In addition, the first bolt cooperates with the first nut to adjust the gap between the first substrate and the second substrate, so that the outer steel meets the size design requirements.

[0009] In some embodiments, the adjustment assembly also includes a second bolt, and second bolt holes for the second bolt to pass through are correspondingly arranged on each side of the first substrate and the second substrate and the adjustment corbel, and the number of the second bolts corresponds one to one to the number of the second bolt holes; the second bolt is threadedly matched with the second bolt hole, and one end of the second bolt on each side of the outer steel can be tightened against the outer wall of the original arch rib to adjust the size of the spacing under the rotation of the second bolt along its own axis.

[0010] In the above technical solution, the adjustment component includes a plurality of second bolts, and each side surface of the first substrate and the second substrate and the adjustment bracket are correspondingly provided with second bolt holes for the second bolts to pass through. Under the action of the second bolts, the distance between each side surface of the outer steel and the original arch rib can be adjusted, and then the installation space of the outer steel can be finely adjusted, so that the spatial position of the outer steel can be adjusted conveniently. More importantly, by adjusting the second bolt in the assembly and utilizing the rotation of the second bolt to act on the outer steel, the pre-arch installation of the outer steel can be realized. After the outer steel is closed, the adjustment component can be used to realize the downward back pressure of the outer steel and the upward unloading of the original arch rib, so that the filling material (concrete) in the outer steel filling space reaches the strength and the adjustment component is removed, so that the concrete inside the outer steel can realize the partial unloading of the original arch rib, thereby improving the utilization efficiency of the concrete inside the outer steel.

[0011] In some embodiments, a second nut is disposed on the inner side wall of the second bolt hole on both the first substrate and the second substrate, and the screw hole on the second nut is communicated with the second bolt hole for the second bolt to pass through and be threadedly engaged with the second bolt.

[0012] In the above technical solution, when the thickness of the first substrate and the second substrate is thin, the threaded hole thickness of the second bolt hole on the outer steel is thin, and the second bolt is prone to thread slippage. Therefore, second nuts are provided on the inner walls of the second bolt holes on the first substrate and the second substrate, and the second nuts can be threadedly matched with the second bolts. In this way, even if the second bolt holes on the first substrate and the second substrate are ordinary connecting holes, the threaded matching relationship between the second bolt and the outer steel can be guaranteed, and under the rotation of the second bolt, the relative position of the outer steel and the original arch rib can be accurately adjusted.

[0013] In some embodiments, in the arch direction of the original arch rib, the number of outer clad steels is set to multiple, and the multiple outer clad steels are distributed in sequence on the original arch rib along the arch direction of the original arch rib, and two adjacent outer clad steels are connected in sequence, and each outer clad steel is provided with an adjustment component.

[0014] In the above technical scheme, since the span of the original arch rib is generally large, in order to facilitate the hoisting of the outer steel and reduce the difficulty of construction, the number of outer steels is set to multiple, and the multiple outer steels are spliced ​​together in the arch direction of the original arch rib, so that the installation of the entire bridge section of the original arch rib is completed under the splicing effect of the multiple outer steels.

[0015] In some embodiments, among the multiple outer cladding steels, the outer cladding steels located at the arch foot are provided with grouting holes, and the outer cladding steels located at the arch top are provided with grouting holes.

[0016] In the above technical solution, grouting holes are provided on the outer steel at the arch foot position, and grouting holes are provided on the outer steel at the arch top position, that is, grouting is adopted from bottom to top. Under the action of counter-gravity, the filling material in the filling space is squeezed from bottom to top, thereby making the filling material in the filling space more substantial and improving the filling effect of the filling material.

[0017] In some embodiments, stiffening ribs are provided on the outer cladding steel.

[0018] In the above technical solution, by arranging stiffening ribs on the outer steel, the stiffening ribs can increase the shear resistance of the outer steel, thereby enhancing the overall stiffness of the outer steel.

[0019] On the second aspect, the embodiment of the present application also provides a construction method for increasing the cross-section reinforcement structure of the arch rib of a steel tube concrete arch bridge, and the construction method includes the following steps: S1, factory processing and pre-assembly; installing the adjusting bracket on the opposite sides of the first base plate and the second base plate on the outer steel in the factory, and then opening a first bolt hole on the adjusting bracket, and opening second bolt holes on each side of the first base plate and the second base plate on the outer steel and on the adjusting bracket, and setting second nuts on the inner sides of all the second bolt holes; S2, outer steel hoisting; hoisting the first base plate and the second base plate by a crane Install it to the installation position of the original arch rib, then pass the first bolt through the first bolt hole of the adjusting bracket on the outer steel, then install the first nut on the first bolt, and screw the second bolt into the adjusting bracket on the outer steel through the second nut; S3, fine-tune the cross-sectional dimensions of the outer steel; check the outline dimensions of the outer steel, when the outline dimensions of the outer steel do not meet the design requirements, act on the first bolt or the second bolt to adjust the outline dimensions of the outer steel to meet the design requirements, complete the preliminary fixation of the first base plate and the second base plate on the outer steel, and then weld and fix the first base plate and the second base plate; S4, Fine-tune the installation space position of the outer steel; screw in the second bolt holes on each side of the outer steel until the inner ends of all the second bolts are in contact with the outer wall of the original arch rib, measure the distance between the outer steel and the original arch rib, and adjust each second bolt until the installation of the outer steel meets the design requirements; S5, set the installation pre-camber of the outer steel; turn the second bolt on the upper side of the outer steel clockwise, and turn the second bolt on the lower side of the outer steel counterclockwise at the same time, so that the outer steel has a pre-camber from bottom to top, and the pre-camber value is determined according to the design calculation; S6, install the whole bridge; repeat steps S2 to S5, from From the arch foot to the arch crown, all the outer cladding steels are installed symmetrically in sequence, and the outer cladding steels of two adjacent sections are welded and connected in the longitudinal direction of the bridge; S7, unloading of the original arch ribs; for the outer cladding steel at the arch crown, turn the second bolt on the upper side of the outer cladding steel counterclockwise, and turn the second bolt on the lower side of the outer cladding steel clockwise at the same time, so that the outer cladding steel at the arch crown moves downward, and the specific downward movement value is determined according to the design calculation; S8, injection of filling material; press the filling material into the grouting holes on the outer cladding steel at the arch foot, and end the injection of filling material when the filling material overflows from the grouting holes on the top of the outer cladding steel at the arch crown.

[0020] In the above technical scheme, the outer steel includes a first substrate and a second substrate, and the first substrate and the second substrate can be separated, so that the outer steel can be installed and covered on the outer peripheral side of the original arch rib, and then the position of the outer steel relative to the original arch rib can be finely adjusted by the adjustment component, so that the outer steel is accurately controlled during the installation process, and the engineering quality of the reinforced structure is ensured. The adjustment component can adjust the filling space between the outer steel and the original arch rib, and then the outer steel and the original arch rib are connected as a whole by filling the filling part, thereby ensuring the stability of the outer steel. The adjustment component can also realize the pre-arch installation of the outer steel, and after the outer steel is closed, the adjustment component can realize the downward back pressure of the outer steel and the upward unloading of the original arch rib, so that the filling material (concrete) in the outer steel filling space reaches the strength and the adjustment component is removed, so that the concrete inside the outer steel bears the partial unloading of the original arch rib, which improves the use efficiency of the concrete inside the outer steel, and has a significant reinforcement effect on the original arch rib.

[0021] In some embodiments, in step S3, after the first substrate and the second substrate are welded together, the adjusting bracket on the outer steel and the first bolt and the second bolt on the adjusting bracket are removed.

[0022] In the above technical scheme, the function of the adjusting corbel and the first bolt and the second bolt on the adjusting corbel is mainly to adjust the relative position of the first substrate and the second substrate so that the outer plate meets the design requirements. After the welding of the first substrate and the second substrate is completed, the first substrate and the second substrate have been connected as a whole, which is equivalent to the size of the outer steel being fixed. Therefore, the adjusting corbel and the first bolt and the second bolt on the adjusting corbel can be removed, which is convenient for fine-tuning the installation space position of the outer steel in the subsequent step S4, because the removed adjusting corbel will not cause dryness to the second bolt on the outer steel, which is convenient for fine-tuning the installation space position of the outer steel in step S4.

[0023] In some embodiments, in step S8, when the strength of the filling material reaches the design requirement, all the second bolts on the outer steel are removed, and the second bolt holes on all the outer steel are sealed.

[0024] In the above technical solution, when the strength of the filling material reaches the design requirement, all the second bolts on the outer steel are removed, and the second bolt holes on all the outer steel are sealed, so that the integrity of the outer steel is better.

[0025] In summary, the main beneficial effects of this solution are:

[0026] 1. Simple operation and good engineering quality. By adjusting the components, the shape of the outer steel and its relative position with the original arch rib can be accurately controlled. The operation is simple and the construction quality is good.

[0027] 2. The new and old structures can be stressed together, and the reinforcement effect is obvious. The outer steel pre-arch can be installed through the adjustment component. After closing, the outer steel can be pressed downward and the original arch rib can be unloaded upward. After the concrete in the outer steel reaches the strength, the adjustment device is removed to realize the outer steel tube concrete to bear the unloading of the original arch rib part, improve the use efficiency of the outer steel concrete, and the reinforcement effect is obvious.

[0028] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of the steel tube concrete arch bridge arch rib with increased cross-section reinforcement structure and the arch bridge provided in some embodiments of the present application;

[0031] Figure 2 for Figure 1 Schematic diagram of the structure of Sino-Foreign Steel;

[0032] Figure 3 for Figure 1 Structural diagram of the Chinese and foreign steel cladding in the wind bracing section;

[0033] Figure 4 Installation cross-sectional view of the reinforced structure of the arch rib of a steel tube concrete arch bridge with an increased cross-section provided in some embodiments of the present application;

[0034] Figure 5 for Figure 4 A schematic diagram of the structure of the adjusting bracket position in the middle adjusting assembly;

[0035] Figure 6 for Figure 4 A partial schematic diagram of the cooperation between the second bolt and the outer steel in the middle adjustment assembly;

[0036] Figure 7 for Figure 4 Structural diagram of the middle adjustment component moving the outer steel upward;

[0037] Figure 8 for Figure 4 Schematic diagram of the structure in which the middle adjustment component moves the outer steel downward.

[0038] Icons: 10-outer steel; 11-first base plate; 12-second base plate; 13-second bolt hole; 14-second nut; 15-first half plate; 16-second half plate; 17-avoidance hole; 20-adjustment assembly; 21-first bolt; 22-second bolt; 30-adjustment corbel; 31-first bolt hole; 32-first nut; 40-grouting port; 41-grouting outlet; 50-stiffening rib; 60-filling part; 200-original arch rib. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0041] 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.

[0042] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing the present application and simplifying the description, and does 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 a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0043] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be directly connected, or 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 this application can be understood according to specific circumstances.

[0044] Example

[0045] In the first aspect, the embodiment of the present application provides a reinforced structure for increasing the cross-section of the arch rib of a steel tube concrete arch bridge, and the reinforced structure is used to reinforce the original arch rib. Figure 1 and Figure 2 The reinforcement structure includes an outer steel 10 and a filling part 60. The outer steel 10 includes a first substrate 11 and a second substrate 12. The first substrate 11 and the second substrate 12 are connected to each other so that the outer steel 10 is sleeved on the outer peripheral side of the original arch rib 200. There is a gap between the inner wall of the outer steel 10 and the outer wall of the original arch rib 200 to form a filling space between the outer steel 10 and the original arch rib 200; the filling part 60 is filled in the filling space, and the filling part 60 is used to connect the outer steel 10 and the original arch rib 200 as a whole; wherein, an adjusting component 20 is provided on the outer steel 10, and the adjusting component 20 is used to adjust the relative position of the outer steel 10 and the original arch rib 200.

[0046] In the present solution, the outer clad steel 10 is made into a split assembly type by including a first substrate 11 and a second substrate 12, that is, the first substrate 11 and the second substrate 12 can be separated and combined with each other, so that the outer clad steel 10 can be sleeved on the outer peripheral side of the original arch rib 200, and then the position of the outer clad steel 10 relative to the original arch rib 200 is finely adjusted by the adjustment component 20, thereby realizing precise control of the outer clad steel 10 during the installation process and ensuring the engineering quality of the reinforced structure. In addition, the adjustment component 20 can adjust the filling space between the outer clad steel 10 and the original arch rib 200, and then the outer clad steel 10 and the original arch rib 200 are connected as a whole by filling the filling part 60, thereby ensuring the stability of the outer clad steel 10 and significantly reinforcing the original arch rib 200.

[0047] The outer steel 10 can be made of a variety of materials. In this embodiment, the outer steel 10 is made of steel plate. The cross-sectional shapes of the first substrate 11 and the second substrate 12 can be the same or different. In this embodiment, the cross-sectional shapes of the first substrate 11 and the second substrate 12 are the same. The shapes of the first substrate 11 and the second substrate can be C-shaped or U-shaped. In addition, the net distance between the outer steel 10 and the original arch rib 200 should be determined based on force calculation and should not be less than 10 cm. For the outer steel 10 in the position where there is wind bracing, please refer to Figure 3 The first substrate 11 or the second substrate 12 can be further divided into two parts, such as a first half plate 15 and a second half plate 16, and avoidance holes 17 are opened on the first half plate 15 and the second half plate 16 at positions corresponding to the wind braces.

[0048] In some embodiments, see Figure 2 and Figure 4The cross-sectional shapes of the first substrate 11 and the second substrate are both C-shaped, and an adjusting bracket 30 is provided on the adjacent side of the first substrate 11 and the second substrate 12, and a first bolt hole 31 is provided on the adjusting bracket 30; the adjusting assembly 20 includes a first bolt 21, and the first bolt 21 passes through the first bolt hole 31 on the first substrate 11 and the second substrate 12 and is locked by a first nut 32 to connect the first substrate 11 and the second substrate 12. The cross-sectional shapes of the first substrate 11 and the second substrate 12 are both C-shaped, that is, the first substrate 11 and the second substrate 12 are both processed into a C-shape or a U-shape by steel plates according to the outer contour of the original arch rib 200, and an adjusting bracket 30 is provided on the adjacent side of the first substrate 11 and the second substrate 12. By using the first bolt 21 in the adjustment component 20, the first bolt 21 passes through the first bolt hole 31 on the first substrate 11 and the second substrate 12 and is locked by the first nut 32, the first substrate 11 and the second substrate 12 can be connected, and the first substrate 11 and the second substrate can be temporarily fixed, which is convenient for the outer steel 10 to be installed on the original arch rib 200. In addition, the first bolt 21 cooperates with the first nut 32 to adjust the gap between the first substrate 11 and the second substrate, so that the outer steel 10 meets the size design requirements.

[0049] There are many ways to connect the adjusting bracket 30 to the first substrate 11 and the second substrate 12. For example, the adjusting bracket 30 and the first substrate 11 or the second substrate 12 may be bolted or welded. In this embodiment, the adjusting bracket 30 and the first substrate 11 or the second substrate 12 are fixed by welding.

[0050] In some embodiments, see Figures 4 to 8The adjustment component 20 also includes a second bolt 22. Second bolt holes 13 for the second bolts 22 to pass through are correspondingly provided on each side of the first substrate 11 and the second substrate and the adjustment bracket 30. The number of the second bolts 22 corresponds to the number of the second bolt holes 13. The second bolts 22 are threadedly matched with the second bolt holes 13. One end of the second bolt 22 on each side of the outer steel 10 can be pressed against the outer wall of the original arch rib 200 to adjust the size of the spacing under the rotation of the second bolt 22 along its own axis. By including a plurality of second bolts 22 in the adjustment component 20, second bolt holes 13 for the second bolts 22 to pass through are correspondingly provided on each side of the first substrate 11 and the second substrate 12 and the adjustment bracket 30. Under the action of the second bolts 22, the distance between each side of the outer steel 10 and the original arch rib 200 can be adjusted, and then the installation space of the outer steel 10 can be finely adjusted, so that the spatial position of the outer steel 10 can be easily adjusted. More importantly, by adjusting the second bolt 22 in the assembly 20 and utilizing the rotation of the second bolt 22 to act on the outer steel 10, the pre-arch installation of the outer steel 10 can be achieved. After the outer steel 10 is closed, the adjustment assembly 20 can be used to achieve the downward back pressure of the outer steel 10 and the upward unloading of the original arch rib 200, so that the filling material (concrete) in the filling space of the outer steel 10 reaches a certain strength and the adjustment assembly 20 is removed, so that the concrete in the outer steel 10 bears part of the unloading of the original arch rib 200, thereby improving the utilization efficiency of the concrete in the outer steel 10.

[0051] In some embodiments, the second nut 14 is provided on the inner side wall of the second bolt hole 13 on the first substrate 11 and the second substrate 12, and the screw hole on the second nut 14 is in communication with the second bolt hole 13, so as to allow the second bolt 22 to pass through and be threadedly engaged with it. In the case where the thickness of the first substrate 11 and the second substrate is relatively thin, the threaded hole thickness of the second bolt hole 13 on the outer steel 10 is relatively thin, and the second bolt 22 is prone to thread slippage. Therefore, by providing the second nut 14 on the inner side wall of the second bolt hole 13 on the first substrate 11 and the second substrate 12, the second nut 14 can be threadedly engaged with the second bolt 22. In this way, even if the second bolt hole 13 on the first substrate 11 and the second substrate 12 is an ordinary connection hole, the threaded engagement relationship between the second bolt 22 and the outer steel 10 can be ensured, and under the rotation of the second bolt 22, the relative position of the outer steel 10 and the original arch rib 200 can be accurately adjusted.

[0052] Among them, the outer steel 10 can be divided into one or more sections in the longitudinal direction of the arch bridge according to actual conditions. In this example, the outer steel 10 is divided into five sections, and the five outer steel 10 are combined and connected and jointly mounted on the outer peripheral side of the original arch rib 200.

[0053] In some embodiments, in the arch direction of the original arch rib 200, the number of the outer steel 10 is set to be multiple, and the multiple outer steels 10 are sequentially distributed on the original arch rib 200 along the arch direction of the original arch rib 200, and two adjacent outer steels 10 are sequentially connected, and each outer steel 10 is provided with an adjustment component 20. Since the span of the original arch rib is generally large, in order to facilitate the hoisting of the outer steel 10 and reduce the difficulty of construction, by setting the number of the outer steel 10 to be multiple, the multiple outer steels 10 are spliced ​​together in the arch direction of the original arch rib 200, so that the installation of the entire bridge section of the original arch rib 200 is completed under the splicing effect of the multiple outer steels 10.

[0054] Among them, two adjacent outer cladding steels 10 in the multiple sections of outer cladding steel 10 are connected by welding, thereby ensuring the overall sealing between the multiple outer cladding steels 10, so that the filling spaces in the multiple outer cladding steels 10 are interconnected, which is convenient for the subsequent filling of filling materials.

[0055] In some embodiments, among the plurality of outer steels 10, the outer steels 10 at the arch foot are provided with grouting holes, and the outer steels 10 at the arch top are provided with grouting holes. By providing grouting holes on the outer steels 10 at the arch foot and grouting holes on the outer steels 10 at the arch top, that is, grouting is performed from bottom to top, and under the action of counter-gravity, the filling materials in the filling space are squeezed from bottom to top, so that the filling materials in the filling space are more substantial, and the filling effect of the filling materials is improved.

[0056] There may be multiple filling materials, for example, the filling material may be cement slurry, grouting material, concrete, etc. In this embodiment, the filling material is concrete.

[0057] In some embodiments, the outer steel 10 is provided with a stiffening rib 50. By providing the stiffening rib 50 on the outer steel 10, the stiffening rib 50 can increase the shear resistance of the outer steel 10, thereby enhancing the overall rigidity of the outer steel 10.

[0058] The stiffening rib 50 is a rectangular steel plate, and the material and thickness of the stiffening rib 50 are the same as those of the outer steel 10. The number of stiffening ribs 50 on the outer steel 10 is set to be multiple, and the stiffening ribs 50 are uniformly welded in the circumferential direction and longitudinal direction of the outer steel 10.

[0059] In the second aspect, the embodiment of the present application further provides a construction method for increasing the cross-section reinforcement structure of the arch rib of a steel tube concrete arch bridge, and the construction method comprises the following steps: S1, factory processing and pre-assembly; in the factory, the adjusting bracket 30 is installed on the first base plate 11 and the second base plate 12 on the outer steel 10 on opposite sides, and then a first bolt hole 31 is opened on the adjusting bracket 30, and second bolt holes 13 are opened on each side of the first base plate 11 and the second base plate on the outer steel 10 and the adjusting bracket 30, and a second nut 14 is set on the inner side of all the second bolt holes 13; S2: hoisting the outer steel 10; hoisting the first base plate 11 and the second base plate 12 to the original arch rib 2 by a crane. 00 to be installed, then the first bolt 21 is passed through the first bolt hole 31 of the adjusting bracket 30 on the outer steel 10, and then the first nut 32 is installed on the first bolt 21, and the second bolt 22 is screwed into the adjusting bracket 30 on the outer steel 10 through the second nut 14; S3: fine adjustment of the cross-sectional dimensions of the outer steel 10; check the outline dimensions of the outer steel 10, when the outline dimensions of the outer steel 10 do not meet the design requirements, act on the first bolt 21 or the second bolt 22 to adjust the outline dimensions of the outer steel 10 to meet the design requirements, complete the preliminary fixation of the first substrate 11 and the second substrate 12 on the outer steel 10, and then weld the first substrate 11 and the second substrate 12 between them. Connect and fix; S4: Fine-tune the installation space position of the outer steel 10; Screw in the second bolt holes 13 on each side of the outer steel 10 until the inner ends of all the second bolts 22 are in contact with the outer wall of the original arch rib 200, measure the distance between the outer steel 10 and the original arch rib 200, and adjust each second bolt 22 until the installation of the outer steel 10 meets the design requirements; S5: Set the installation pre-camber of the outer steel 10; Screw the second bolt 22 on the upper side of the outer steel 10 clockwise, and screw the second bolt 22 on the lower side of the outer steel 10 counterclockwise at the same time, so that the outer steel 10 has a pre-camber from bottom to top, and its pre-camber value is determined according to the design calculation; S6: Full bridge installation; Repeat Steps S2 to S5, symmetrically install all the outer clad steels 10 from the arch foot to the arch crown, and weld the outer clad steels 10 of two adjacent sections in the longitudinal direction of the bridge; S7: unload the original arch rib 200; for the outer clad steel 10 located at the arch crown, turn the second bolt 22 on the upper side of the outer clad steel 10 counterclockwise, and turn the second bolt 22 on the lower side of the outer clad steel 10 clockwise at the same time, so that the outer clad steel 10 located at the arch crown moves downward, and the specific downward movement value is determined according to the design calculation; S8: injection of filling material; press the filling material into the grouting hole on the outer clad steel 10 located at the arch foot, and end the injection of the filling material when the filling material overflows from the grouting hole on the top of the outer clad steel 10 at the arch crown.

[0060] In the above technical scheme, the outer clad steel 10 includes a first substrate 11 and a second substrate 12, and the first substrate 11 and the second substrate 12 can be separated, so that the outer clad steel 10 can be installed and coated on the outer peripheral side of the original arch rib 200, and then the position of the outer clad steel 10 relative to the original arch rib 200 can be finely adjusted through the adjustment component 20, thereby realizing precise control of the outer clad steel 10 during the installation process, ensuring the engineering quality of the reinforced structure, and the adjustment component 20 can adjust the filling space between the outer clad steel 10 and the original arch rib 200, and then the outer clad steel 10 and the original arch rib 200 are connected as a whole by filling the filling part 60, thereby ensuring the stability of the outer clad steel 10. In addition, the pre-arch installation of the outer steel 10 can be realized through the adjusting component 20. After the outer steel 10 is closed, the downward counter pressure of the outer steel 10 and the upward unloading of the original arch rib 200 can be realized through the adjusting component 20, so that the filling material (concrete) in the filling space of the outer steel 10 reaches a certain strength and the adjusting component 20 is removed, so that the concrete in the outer steel 10 bears part of the unloading of the original arch rib 200, thereby improving the utilization efficiency of the concrete in the outer steel 10 and significantly reinforcing the original arch rib 200.

[0061] It should be noted that in step S3, when the cross-sectional dimensions of the outer steel 10 are finely adjusted, the tightening nut can be rotated when the dimension of the outer steel 10 is larger than the design value; and the second bolt 22 can be rotated when the dimension of the outer steel 10 is smaller than the design value, so that the outline dimension of the outer steel 10 meets the design requirements. In addition, in step S4, each second bolt 22 is adjusted until the installation of the outer steel 10 meets the design requirements. Specifically, a steel ruler can be used to measure the distance between the outer steel 10 and the original arch rib 200. When the upper distance between the outer steel 10 and the original arch rib 200 is less than the design value, the head of the second bolt 22 on the upper side of the outer steel 10 is turned clockwise and the head of the second bolt 22 on the lower side of the outer steel 10 is turned counterclockwise. When the upper distance between the outer steel 10 and the original arch rib 200 is greater than the design value, the head of the second bolt 22 on the upper side of the outer steel 10 is turned counterclockwise and the head of the second bolt 22 on the lower side of the outer steel 10 is turned clockwise until the vertical spatial position of the outer steel 10 is finely adjusted to meet the design requirements. Similarly, the horizontal spatial position of the outer steel 10 is finely adjusted.

[0062] In some embodiments, in step S3, after the first substrate 11 and the second substrate 12 are welded and connected, the adjusting bracket 30 on the outer steel 10 and the first bolt 21 and the second bolt 22 on the adjusting bracket 30 are removed. The adjusting bracket 30 and the first bolt 21 and the second bolt 22 on the adjusting bracket 30 are mainly used to adjust the relative position of the first substrate 11 and the second substrate, so that the outer plate meets the design requirements. After the welding of the first substrate 11 and the second substrate 12 is completed, the first substrate 11 and the second substrate have been connected as a whole, which is equivalent to the size of the outer steel 10 being fixed. Therefore, the adjusting bracket 30 and the first bolt 21 and the second bolt 22 on the adjusting bracket 30 can be removed, which is convenient for fine adjustment of the installation space position of the outer steel 10 in the subsequent step S4, because the removed adjusting bracket 30 will not cause dryness to the second bolt 22 on the outer steel 10, which is convenient for fine adjustment of the installation space position of the outer steel 10 in step S4.

[0063] In some embodiments, in step S8, when the strength of the filling material reaches the design requirements, all the second bolts 22 on the outer steel 10 are removed, and the second bolt holes 13 on all the outer steel 10 are sealed. When the strength of the filling material reaches the design requirements, all the second bolts 22 on the outer steel 10 are removed, and the second bolt holes 13 on all the outer steel 10 are sealed, so that the integrity of the outer steel 10 is better.

[0064] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0065] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A reinforced structure for increasing the cross-section of the arch rib of a steel tube concrete arch bridge, used for reinforcing the original arch rib, characterized in that: include: The outer steel comprises a first base plate and a second base plate, wherein the first base plate and the second base plate are mutually enclosed and connected, so that the outer steel can be sleeved on the outer peripheral side of the original arch rib, and there is a gap between the inner wall of the outer steel and the outer wall of the original arch rib, so that a filling space is formed between the outer steel and the original arch rib; A filling part is filled in the filling space, and the filling part is used to connect the outer steel and the original arch rib into a whole; Wherein, the outer steel is provided with a stiffening rib; the outer steel is provided with an adjustment component, and the adjustment component is used to adjust the relative position of the outer steel and the original arch rib; The cross-sectional shapes of the first substrate and the second substrate are both C-shaped, and an adjusting bracket is provided on one adjacent side of the first substrate and the second substrate, and a first bolt hole is provided on the adjusting bracket; The adjustment assembly includes a first bolt, which passes through the first bolt holes on the first substrate and the second substrate and is locked by a first nut to connect the first substrate and the second substrate; The adjustment assembly also includes a second bolt, and second bolt holes for the second bolt to pass through are correspondingly arranged on each side surface of the first substrate and the second substrate and the adjustment corbel, and the number of the second bolts corresponds to the number of the second bolt holes one by one; the second bolt is threadedly matched with the second bolt hole, and one end of the second bolt on each side surface of the outer steel can be tightly pressed against the outer wall of the original arch rib to adjust the size of the spacing under the rotation of the second bolt along its own axis.

2. The steel tube concrete arch bridge arch rib enlarged cross-section reinforcement structure according to claim 1, characterized in that: Second nuts are provided on the inner side walls of the second bolt holes on the first substrate and the second substrate, and the screw holes on the second nuts are communicated with the second bolt holes so as to allow the second bolts to pass through and be threadedly engaged with the second bolts.

3. The steel tube concrete arch bridge arch rib enlarged cross-section reinforcement structure according to claim 1, characterized in that: In the arch direction of the original arch rib, the number of the outer clad steels is set to multiple, and the multiple outer clad steels are distributed in sequence on the original arch rib along the arch direction of the original arch rib, and two adjacent outer clad steels are connected in sequence, and each of the outer clad steels is provided with the adjustment component.

4. The steel tube concrete arch bridge arch rib enlarged cross-section reinforcement structure according to claim 3, characterized in that: Among the multiple outer cladding steels, the outer cladding steels located at the arch foot are provided with grouting holes, and the outer cladding steels located at the arch top are provided with grouting holes.

5. A construction method for increasing the cross-section of a reinforced structure of a steel tube concrete arch bridge arch rib, characterized in that: The following steps are involved: S1, factory processing and pre-assembly; The adjusting bracket is installed on opposite sides of the first base plate and the second base plate on the outer steel in the factory, and then a first bolt hole is opened on the adjusting bracket, and second bolt holes are opened on each side of the first base plate and the second base plate on the outer steel and on the adjusting bracket, and second nuts are arranged on the inner sides of all the second bolt holes; S2, hoisting the outer steel: hoist the first base plate and the second base plate to the installation position of the original arch rib by a crane, then pass the first bolt through the first bolt hole of the adjusting bracket on the outer steel, then install the first nut on the first bolt, and screw the second bolt into the adjusting bracket on the outer steel through the second nut; S3, fine-adjusting the cross-sectional dimensions of the outer steel; checking the outline dimensions of the outer steel, and when the outline dimensions of the outer steel do not meet the design requirements, acting on the first bolt or the second bolt to adjust the outline dimensions of the outer steel to meet the design requirements, completing the preliminary fixation of the first substrate and the second substrate on the outer steel, and then welding and fixing the first substrate and the second substrate; S4, fine-tuning the installation space position of the outer steel; screwing the second bolts into the second bolt holes on each side of the outer steel until the inner ends of all the second bolts contact the outer wall of the original arch rib, measuring the distance between the outer steel and the original arch rib, and adjusting each of the second bolts until the installation of the outer steel meets the design requirements; S5, setting the installation pre-camber of the outer steel: screw the second bolt on the upper side of the outer steel clockwise, and screw the second bolt on the lower side of the outer steel counterclockwise, so that the outer steel has a pre-camber from bottom to top; S6, installing the entire bridge; repeating steps S2 to S5, symmetrically installing all the outer steels from the arch foot to the arch top, and welding the outer steels of two adjacent sections in the longitudinal direction of the bridge; S7, unloading the original arch rib; for the outer steel at the arch top position, screwing the second bolt on the upper side of the outer steel counterclockwise, and screwing the second bolt on the lower side of the outer steel clockwise, so that the outer steel at the arch top position moves downward; S8, injection of filling material; pressurizing the filling material into the grouting holes on the outer steel at the arch foot, and ending the injection of the filling material when the filling material overflows from the grouting holes on the top of the outer steel at the arch top.

6. The construction method of the reinforced structure of the steel tube concrete arch bridge arch rib with increased cross-section as claimed in claim 5, characterized in that: In step S3, after the first substrate and the second substrate are welded together, the adjusting bracket on the outer steel and the first bolt and the second bolt on the adjusting bracket are removed.

7. The construction method of the reinforced structure of the steel tube concrete arch bridge arch rib with increased cross-section as claimed in claim 5, characterized in that: In step S8, when the strength of the filling material reaches the design requirement, all the second bolts on the outer steel are removed, and the second bolt holes on all the outer steel are sealed.

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