A suspension rod replacement device and a replacement method

Abstract

The present invention belongs to the technical field of bridge hanger replacement, and specifically relates to a hanger replacement device and replacement method, including a contour clamping base, a positioning assembly and an ear plate assembly; the clamping surface of the contour clamping base is the same as the outer contour shape of the arch rib and is sleeved on the arch rib, the positioning assembly is installed between the contour clamping base and the arch rib to lock the position of the contour clamping base on the arch rib, and the ear plate assembly is welded and fixed to the contour clamping base. A new hanger is installed by arranging a fixed contour clamping base and ear plate assembly on the arch rib, and there is no need to use the fixed anchor head of the old hanger when replacing the hanger, which solves the problem in the prior art that when the fixed anchor head of the old hanger is buried inside the arch rib, the arch rib needs to be opened when replacing the new hanger, which will cause damage to the arch rib. The contour clamping base of the device is manufactured according to the specific cross-section of the arch rib and can be applicable to arch ribs of various cross-sections.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge hanger replacement, and in particular relates to a hanger replacement device and a replacement method. Background Art

[0002] Tie-arch bridges are widely constructed and used due to their strong spanning capacity and adaptability to foundations. However, as the operation time of bridges increases, the hangers of tie-arch bridges will gradually show problems such as aging, damage, and disease. If they are not maintained and renovated in time, there will be major safety hazards.

[0003] The traditional solution is to replace the boom, but there are two major problems in replacing the boom:

[0004] First, in order to improve the stability of the connection between the arch ribs and the hangers, some early-designed tied-arch bridges designed the anchor points of the hangers and the arch ribs inside the arch rib structure. The arch ribs needed to be cut to expose the anchor points before replacement, which would cause damage to the arch ribs and affect the stress on the arch ribs, posing a risk of arch rib breakage.

[0005] Second, it is necessary to review and calculate the working conditions when the boom is dismantled. The design process is complicated and there are great construction risks.

[0006] In summary, there is an urgent need to design a hanger replacement device to avoid cutting the arch ribs and simplify the construction process to reduce construction risks. Summary of the invention

[0007] In order to solve the above problems existing in the prior art, the present invention provides a hanger rod replacement and replacement method applicable to arch ribs of any cross-section, which solves the problem of completing the hanger rod replacement without damaging the original arch ribs.

[0008] The objectives of the present invention can be achieved through the following technical solutions: a hanger replacement device, comprising a contoured clamping base, a positioning assembly and an ear plate assembly; the clamping surface of the contoured clamping base is the same as the outer contour shape of the arch rib and is sleeved on the arch rib, the positioning assembly is installed between the contoured clamping base and the arch rib to lock the position of the contoured clamping base on the arch rib, and the ear plate assembly is welded and fixed to the contoured clamping base.

[0009] Preferably, the contoured clamping base includes two contoured outer panels, which are symmetrically buckled on both sides of the arch rib, one end of the two contoured outer panels are connected, and the other end is formed with an extension section, and the two extension sections are fixed by bolts.

[0010] Preferably, the outer surface of any contoured outer covering plate is welded with reinforcing ribs.

[0011] Preferably, the ear plate assembly includes an ear plate body and a plurality of mounting holes opened on the ear plate body, the ear plate body is welded and fixed to the contoured clamping base, and the plurality of mounting holes are symmetrically distributed about the central axis of the contoured clamping base or arranged along the axis.

[0012] Preferably, the positioning assembly includes anti-sliding blocks symmetrically arranged on both sides of the contoured clamping base.

[0013] Preferably, the positioning assembly further comprises a cold-expanding and heat-shrinking pad layer provided between the contoured clamping base and the arch rib, and the cold-expanding and heat-shrinking pad layer is an antimony metal layer, a bismuth metal layer or a gallium metal layer.

[0014] A method for replacing a suspension rod comprises the following steps:

[0015] S1: Prefabrication: prefabricate the contour clamping base according to the shape and size of the arch rib, and pre-weld the ear plate assembly on the contour clamping base;

[0016] S2: Positioning: mark the positioning point on the arch rib according to the installation position of the old hanger, and put the contour clamping base on the arch rib and lock it at the positioning point;

[0017] S3: Bridge deck anchoring, stake out the hole positions and install the fixed anchors on the bridge deck, and install the new hangers based on the fixed anchors and lug assembly;

[0018] S4: Equivalent conversion, installing cable force sensors on the old and new suspenders respectively to measure the cable force values ​​of the old and new suspenders, gradually increasing the cable force value of the new suspender and releasing the cable force value of the old suspender through the cable force tensioning equipment, so that the cable force value of the old suspender approaches zero and the cable force value of the new suspender approaches the cable force value of the dead load, and anchoring the new suspender;

[0019] S5: Remove the old hanger, cut off the old hanger and keep the anchor end of the old hanger.

[0020] Preferably, two new hangers are simultaneously tensioned to replace the old hangers, and the step-by-step tensioning force values ​​of the new hangers are 10%, 30%, 50%, 70%, 90%, 100% of the constant load force values ​​of the old hangers, and the corresponding step-by-step release of the constant load force values ​​of the old hangers is 0, 20%, 40%, 60%, 80%, 100% of the original constant load force values.

[0021] Preferably, the cable tension values ​​of the new hanger rod and the old hanger rod are adjusted step by step in the order of first tensioning the cable tension value of the new hanger rod and then releasing the cable tension value of the old hanger rod.

[0022] The beneficial effects of the present invention are as follows: by arranging a fixed profiling clamping base on the arch rib, almost no hole is drilled on the arch rib, and when the hanger is replaced, there is no need to use the fixed anchor head of the old hanger, and the fixed anchor head of the old hanger is retained, which solves the problem of damage to the arch rib caused by opening an opening on the arch rib to use the fixed anchor head of the old hanger to install the new hanger, and the profiling clamping base of the device is made according to the specific cross-section of the arch rib, so that it can be suitable for arch ribs of various cross-sections; on the other hand, by arranging a cold expansion and heat contraction layer in the gap between the profiling clamping base and the arch rib, which is contrary to the commonly existing thermal expansion and contraction principle of the arch rib and the profiling clamping base, regardless of how the external environmental temperature changes, the tightness of the connection between the arch rib and the profiling clamping base is always maintained, thereby ensuring the stability of the connection between the hanger and the arch rib after subsequent replacement; the replacement device is also convenient for the subsequent replacement of the hanger, and the method does not require temporary bearing equipment, reducing the expansion of the cable force value error caused by two cable force conversions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 It is an elevation view of the suspension rod replacement structure of the present invention;

[0025] Figure 2 for Figure 1 AA surface cross section;

[0026] Figure 3 for Figure 1 BB cross-section.

[0027] Main component symbols

[0028] In the figure: 1. Arch rib; 2. Old hanger; 3. Outer cover plate; 4. Ear plate body; 5. Reinforcement rib; 6. Anti-sliding block; 7. Mounting hole; 8. Bolt; 9. Cold expansion and heat shrinkage cushion layer. DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0030] See also Figure 1-Figure 3The present embodiment provides a suspension rod replacement device, including a contoured clamping base, a positioning assembly and an ear plate assembly; the clamping surface of the contoured clamping base is the same as the outer contour shape of the arch rib 1 and is sleeved on the arch rib 1, the contoured clamping base includes two contoured outer panels 3, and the two contoured outer panels 3 are symmetrically buckled on both sides of the arch rib 1. Since the arch rib 1 itself has a certain curvature, in order to increase the stability of the connection between the contoured clamping base and the arch rib 1, the positioning assembly is installed between the contoured clamping base and the arch rib 1 to lock the position of the contoured clamping base on the arch rib 1.

[0031] The ear plate assembly 4 is welded and fixed to the contoured clamping base to form an integrated structure. The ear plate assembly 4 is used for the installation of a new suspension rod. That is, the shapes of the two outer covering plates 3 are not restricted, and they can be designed according to the specific shape of the arch rib 1 during the construction process. The present application adopts an implementation method in which the outer covering plate 3 adapts to the cross-section of the arch rib 1 to be dumbbell-shaped; because the general replacement device is prefabricated in advance in the factory, in order to facilitate installation, one end of the two contoured outer covering plates 3 can be connected by a butt weld, and the other end is formed with an extension section, and the two extension sections are fitted to each other and locked and connected by high-strength bolts 8. That is, during installation, the two contoured outer covering plates 3 are buckled onto the arch rib 1, and then one end of the two contoured outer covering plates 3 is welded as a whole, and then the bolt 8 holes of the extension section are locked with high-strength bolts 8, so that the two contoured outer covering plates 3 are fitted to the surface of the arch rib 1. The hinged relationship between the two contoured outer covering plates 3 can use a special hinge or a pin to connect the two contoured outer covering plates 3 to achieve the hinged connection at one end of the two contoured outer covering plates 3 required in this embodiment and meet the load-bearing capacity.

[0032] In order to adapt to the complex shape of the arch rib 1 and enhance the stability of the connection between the two contoured outer panels 3 and the surface of the arch rib 1, a filling layer is filled between the surface of the arch rib 1 and the contoured outer panels 3. The filling layer can be made of epoxy resin or other materials that meet the requirements of the present invention for the filling layer.

[0033] In order to enhance the load-bearing capacity of the contoured outer panel 3 and prevent it from deformation, reinforcing ribs 5 are welded on the outer surface of any contoured outer panel 3. The reinforcing ribs 5 can be vertically welded to both sides of the contoured outer panel 3. The reinforcing ribs 5 are spaced apart on both sides of the boom ear plate. Multiple pairs of reinforcing ribs 5 can be provided or they can be provided individually. Multiple pairs of reinforcing ribs 5 are parallel to the boom ear plate, that is, multiple pairs of reinforcing ribs 5 are welded together on the outside of the outer panel 3 for reinforcing the outer panel 3. Specifically, in the actual construction process, the specific design can be based on the length of the outer panel 3 and the stability of the outer panel 3.

[0034] The ear plate assembly 4 includes an ear plate main body 4 and a plurality of mounting holes 7 opened on the ear plate main body 4. The ear plate main body 4 is welded and fixed to the contoured clamping base. In actual construction, because the mounting holes 7 on the ear plate assembly are used for the installation of the new hanger, from a mechanical point of view, in order to ensure uniform force, the ear plate main body is installed in the middle position of the contoured outer plate 3. The plurality of mounting holes 7 are symmetrically distributed with respect to the central axis of the contoured clamping base or arranged along the axis. The number of mounting holes 7 and their positions on the ear plate main body 4 are designed according to the specific installation requirements of the new hanger.

[0035] The present embodiment provides an installation method that requires converting the original single hanger into two shaped hangers. In addition, considering the convenience of converting the cable force value during system conversion, two mounting holes 7 are designed on both sides of the ear plate body 4 and the two mounting holes 7 are symmetrical to each other. The ear plate assembly and the old hanger 2 are in the same plane, and the two mounting holes 7 are symmetrical about the axis of the old hanger 2. Such a positional relationship is conducive to the construction calculation of the equivalent conversion of the cable force value when the old hanger 2 and the new hanger are replaced. The horizontal tension between the hangers installed on both sides of the ear plate body 4 offsets each other, and the vertical force is transferred to the corresponding arch rib 1 through the contoured outer plate 3, and the overall stability is stronger.

[0036] In order to ensure the stability of the installation of the new boom, several reinforcement gaskets are arranged at the positions of the two mounting holes 7. The reinforcement gasket is a component used to strengthen the seal, usually used to prevent fluid leakage. It is made of materials such as paper, rubber sheet or copper sheet, and is placed between two planes to fill the possible irregularities of the machined surface and ensure the seal between the two objects. This gasket can withstand the influence of pressure, corrosion and the natural thermal expansion and contraction of the pipeline. The reinforcement gasket here is installed on both sides of the two mounting holes 7 relative to the ear plate body 4, which is used to increase the installation tightness of the boom installed through the mounting holes 7.

[0037] In the installation of the two contoured clamping bases, since the arch rib 1 itself has a certain curvature, in order to increase the stability of the installation device, the positioning component includes anti-sliding blocks 6 symmetrically arranged on both sides of the contoured clamping base, and the two anti-sliding blocks 6, the anti-sliding blocks 6 and the contoured clamping base are all made of metal materials, and the two surfaces of the anti-sliding blocks 6 are respectively welded to the end surface of the contoured clamping base and the surface of the arch rib 1, so that the limiting effect of the anti-sliding blocks 6 on the contoured clamping base is further improved by increasing the contact surface.

[0038] In nature, most substances follow the law of "thermal expansion and contraction". Therefore, when the external ambient temperature is low, both the arch rib 1 and the contoured clamping base will shrink to a certain extent. Then, a gap will inevitably appear between the arch rib 1 and the contoured clamping base that were originally tightly fitted, or even between the general viscous materials filled between the two. Therefore, in order to avoid such a phenomenon and cause the stability of the connection between the arch rib 1 and the contoured clamping base, the positioning component also includes a cold expansion and heat shrinkage cushion layer 9 padded between the contoured clamping base and the arch rib 1. The principle of the cold expansion and heat shrinkage cushion layer 9 is opposite to that of thermal expansion and contraction, that is, the arch rib 1 and the contoured clamping base will both expand and contract, and the cushion layer filled between the arch rib 1 and the contoured clamping base will also expand and contract. Therefore, no matter whether the external temperature is cold or hot, the tightness of the connection between the arch rib 1 and the contoured clamping base can be guaranteed. The cold expansion and heat shrinkage cushion layer 9 is an antimony metal layer, a bismuth metal layer or a gallium metal layer.

[0039] This embodiment discloses a method for replacing a suspension rod, comprising the following steps:

[0040] S1: Prefabrication: prefabricate the contour clamping base according to the shape and size of the arch rib 1, and pre-weld the ear plate assembly on the contour clamping base.

[0041] S101: two-flavor contoured outer covering plates 3 are enclosed to embrace the arch rib 1, and a cold expansion and heat contraction layer is provided in the gap between the arch rib 1 and the outer covering steel plate, and the bolt 8 holes formed by the extension section of the two-flavor steel plate outer covering steel plate are tension-connected and fastened by high-strength bolts 8;

[0042] S102: welding two suspension rod ear plates at the center axis position of the two contoured outer steel plates, and the two suspension rod ear plate bodies 4 and the old suspension rod 2 are in the same plane;

[0043] S103: Two pairs of stiffening ribs are welded on the contoured outer steel plate and are symmetrically spaced at a certain distance about the four axes of the hanger ear plate body;

[0044] S104: welding anti-sliding blocks 6 on the upper surface of the arch rib 1 and at both ends of the contoured outer steel plate, and welding the lower end of any anti-sliding block 6 to the upper surface of the arch rib 1;

[0045] S2: Positioning: mark the positioning point on the arch rib 1 according to the installation position of the old hanger 2, put the contour clamping base on the arch rib 1 and lock it at the positioning point:

[0046] Lay out the hole position and drill the hole on the bridge deck, measure the hole position of the corresponding mounting hole 7 on the hanger ear plate body 4 on the bridge deck by total station, level and steel ruler, use drilling machine to drill the hole, and ensure that the verticality of the hole is less than 1%, ensure the verticality of the hole, use the inclination sensor to measure the drilling angle in real time, connect the inclination sensor and the controller, and the inclination sensor uploads the measurement result to the controller for real-time monitoring by construction personnel;

[0047] S3: Anchoring the bridge deck, marking the hole position and installing the fixed anchor seat on the bridge deck, installing the new hanger based on the fixed anchor seat and the ear plate assembly, and installing two new hangers synchronously from bottom to top. The new hanger passes through the corresponding hole on the bridge deck, and the fixed anchor head of the new hanger is fixedly installed on the hanger installation hole 7. The tensioning end anchor head of the new hanger is connected to the tension rod, and the tension rod passes through the new hanger cross beam and the through-hole jack, and the tension rod is tensioned step by step through the through-hole jack;

[0048] S4: realize the equivalent conversion of the cable force of the old suspender 2 to the new suspender;

[0049] S401: Install cable force sensors on the old hanger 2 and the two new hangers to measure the cable force values ​​of the old hanger 2 and the new hangers, install cable force release equipment on the old hanger 2, realize the relaxation of the old hanger 2 through the gradual return of the jack, install cable force tensioning equipment on the two new hangers, and connect the cable force sensor and the cable force tensioning and releasing equipment to a controller using wireless equipment respectively, so that the construction personnel can monitor the data on the controller in real time and adjust the construction;

[0050] S402: The cable force sensor of the old hanger 2 uploads the measured constant load cable force value of the old hanger 2 to the controller. The controller calculates the cable force values ​​of the two new hangers after analysis. The controller controls the tensioning cable force device to realize the step-by-step tensioning of the two new hangers, and synchronously controls the cable force releasing device to realize the step-by-step release of the cable force of the old hanger 2 until the old hanger 2 is in a powerless state. In this step, the order of first tensioning the cable force of the new hanger and then releasing the cable force of the old hanger 2 is adopted step by step;

[0051] S403: After the tensioning of the two new suspenders is completed, anchoring the tensioning anchor heads of the two new suspenders;

[0052] S5: dismantle the old boom 2;

[0053] S501: Inspect the two new hangers and spray anti-corrosion materials on the new hangers. The new hangers and the contoured clamping base may be galvanized, sprayed or hot-dipped with aluminum-zinc alloy, which can delay the aging of the steel material and improve its corrosion resistance. Cut off the old hanger 2 to the outer edge of the arch rib 1 wall plate, and reinforce the mounting seat of the old hanger on the arch rib 1; this is suitable for the case where the arch rib 1 itself is relatively fragile, and can minimize the damage to the arch rib 1 itself;

[0054] S502: Acceptance. Acceptance criteria include: bridge deck deformation value is controlled within the range of ±5mm for up and down displacement.

[0055] In one embodiment, in step S4, the cable tension values ​​of the new hanger rod are gradually tensioned to 10%, 30%, 50%, 70%, 90%, and 100% of the constant load cable tension values ​​of the old hanger rod 2, and the constant load cable tension values ​​of the old hanger rod 2 are correspondingly released step by step to 0, 20%, 40%, 60%, 80%, and 100% of the original constant load cable tension values. The conversion of the cable tension values ​​of the new and old hanger rods 2 is achieved step by step in the order of first tensioning the cable tension value of the new hanger rod and then releasing the cable tension value of the old hanger rod. By first tensioning the cable tension value of the new hanger rod and then releasing the cable tension value of the old hanger rod, a smooth conversion of the cable tension value is achieved. The cable tension value of the old hanger rod tensioned first is always higher than the cable tension value of the old hanger rod released later, ensuring that the load-bearing capacity of the bridge is not affected. The cable tension value of the old hanger rod tensioned first is 10% higher than the cable tension value released by the old hanger rod of the same level. This is to minimize the cable tension difference between the new and old hangers.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for replacing a suspension rod, characterized in that: The suspension rod replacement device used includes a profiling clamping base, a positioning assembly and an ear plate assembly; the clamping surface of the profiling clamping base has the same shape as the outer contour of the arch rib and is sleeved on the arch rib, the positioning assembly is installed between the profiling clamping base and the arch rib to lock the position of the profiling clamping base on the arch rib, and the ear plate assembly is welded and fixed to the profiling clamping base; The following steps are also included: S1: Prefabrication: prefabricate the contour clamping base according to the shape and size of the arch rib, and pre-weld the ear plate assembly on the contour clamping base; S2: Positioning: mark the positioning point on the arch rib according to the installation position of the old hanger, and put the contour clamping base on the arch rib and lock it at the positioning point; S3: Bridge deck anchoring, stake out the hole positions and install the fixed anchors on the bridge deck, and install the new hangers based on the fixed anchors and lug assembly; S4: Equivalent conversion, installing cable force sensors on the old and new suspenders respectively to measure the cable force values ​​of the old and new suspenders, gradually increasing the cable force value of the new suspender and releasing the cable force value of the old suspender through the cable force tensioning equipment, so that the cable force value of the old suspender approaches zero and the cable force value of the new suspender approaches the cable force value of the dead load, and anchoring the new suspender; S5: Remove the old hanger, cut off the old hanger, and retain the anchor end of the old hanger inside the arch rib.

2. A method for replacing a suspension rod according to claim 1, characterized in that: The contoured clamping base includes two contoured outer panels, which are symmetrically buckled on both sides of the arch rib. One end of the two contoured outer panels are connected to each other, and the other end is formed with an extension section, and the two extension sections are fitted to each other and connected by bolt locking.

3. A method for replacing a suspension rod according to claim 2, characterized in that: The outer surface of any contoured outer cladding plate is welded with reinforcing ribs.

4. A method for replacing a suspension rod according to claim 1, characterized in that: The ear plate assembly includes an ear plate body and a plurality of mounting holes opened on the ear plate body. The ear plate body is welded and fixed to the contour clamping base. The plurality of mounting holes are symmetrically distributed with respect to the central axis of the contour clamping base or arranged along the axis.

5. A method for replacing a suspension rod according to claim 1, characterized in that: The positioning assembly comprises anti-sliding blocks symmetrically arranged on both sides of the contoured clamping base.

6. A method for replacing a suspension rod according to claim 5, characterized in that: The positioning component also includes a cold expansion and heat shrinkage cushion layer arranged between the contoured clamping base and the arch rib, and the cold expansion and heat shrinkage cushion layer is an antimony metal layer, a bismuth metal layer or a gallium metal layer.

7. A method for replacing a suspension rod according to claim 1, characterized in that: Two new hangers are used to replace the old hangers by synchronous tensioning. The tension values ​​of the new hangers are 10%, 30%, 50%, 70%, 90% and 100% of the constant load tension values ​​of the old hangers. Correspondingly, the constant load tension values ​​of the old hangers are gradually released to 0, 20%, 40%, 60%, 80% and 100% of the original constant load tension values.

8. A method for replacing a suspension rod according to claim 7, characterized in that: The cable tension values ​​of the new hanger and the old hanger are adjusted step by step in the order of first tensioning the cable tension value of the new hanger and then releasing the cable tension value of the old hanger.

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