A stress conversion device and method used during the removal process of an arch rib of an arch bridge

Abstract

The present invention belongs to the technical field of construction equipment for concrete-filled steel tubular arch bridges, and particularly relates to a stress conversion device and method used during the demolition of the arch rib of an arch bridge. The present invention comprises a base, a stress-bearing steel section, and a stress detection mechanism; the stress-bearing steel section is fixed on the top surface of the base; the stress detection mechanism is connected to the lower bottom surface of the stress-bearing steel section. By installing the present invention on the arch rib, the residual stress generated during the cutting of the first section of the arch rib can be converted onto the present invention, preventing the arch rib from undergoing large displacements due to the release of residual stress, thereby reducing the construction risk. Through monitoring the stress of the present invention, the magnitude of the stress converted to the conversion device can be accurately understood, so as to carry out subsequent construction precisely.

Description

Technical Field

[0001] The invention belongs to the technical field of construction equipment for concrete-filled steel tube arch bridges, and particularly relates to a stress conversion device and method used in the process of removing the arch rib of an arch bridge. Background Art

[0002] As the main load-bearing member of a concrete-filled steel tube arch bridge, after long-term operation, the arch rib structure has varying degrees of damage. In addition, during the process of demolishing the arch bridge, after the demolition construction of other superstructures such as the bridge deck, bridge deck beams, and suspenders, there will inevitably be residual stresses inside the arch rib. When removing the first segment of the arch rib, the residual stress of the arch rib will be released instantly when the arch rib is opened. Due to its unpredictability, it may cause a large displacement or vibration of the arch rib segment, affecting construction safety.

[0003] In order to solve the problem of large deflection of the arch rib that may be caused by the release of residual stress during the removal of the first segment of the arch rib and ensure construction safety, when cutting the first segment of the arch rib, it is necessary to use relevant devices to transfer the residual stress generated instantaneously during the cutting of the arch rib, and change the release of residual stress from an uncontrollable process to a controllable process, so as to greatly reduce the construction risk. Summary of the Invention

[0004] The invention provides a stress conversion device and method used in the process of removing the arch rib of an arch bridge, aiming to provide a device and method that can transfer the residual stress generated instantaneously during the cutting of the first segment of the arch rib, thereby reducing the construction risk.

[0005] To achieve the above object, the technical solution adopted by the invention is:

[0006] A stress conversion device used in the process of removing the arch rib of an arch bridge, comprising a base, a stress-bearing steel section, and a stress detection mechanism; the stress-bearing steel section is fixed on the top surface of the base; the stress detection mechanism is connected to the lower bottom surface of the stress-bearing steel section.

[0007] The base includes a base steel plate and a base panel; there are multiple base steel plates, and at least three rows of the multiple base steel plates are arranged in parallel; the base panel is horizontally and fixedly connected to the tops of the multiple base steel plates; the stress-bearing steel section is fixedly connected to the upper surface of the base panel.

[0008] At least three base steel plates are symmetrically arranged in each row

[0009] A row of base steel plates is fixedly connected to the lower bottom surface of the central axis and the outer edges on both sides of the central axis of the base panel respectively.

[0010] The height of each row of base panels is different; the height of each row of base panels gradually increases symmetrically from the middle to both sides.

[0011] The stressed steel section used is an I-beam.

[0012] The stress detection mechanism includes a strain sensor, a signal transmission line, and a strain sensor data receiving instrument. The strain sensor is connected to the strain sensor data receiving instrument through the signal transmission line.

[0013] A method for stress conversion during the removal of an arch rib of an arch bridge. The dumbbell-shaped steel pipe arch section of the arch bridge is at least provided with an upper chord pipe of the arch rib and a lower chord pipe of the arch rib. A web is arranged between the upper chord pipe of the arch rib and the lower chord pipe of the arch rib. A stress conversion device is adopted, and the method includes the following steps.

[0014] Step 1: Cut the upper chord pipe of the arch rib.

[0015] Step 2: Take three stress conversion devices with strain sensors and fix them on the upper surface and both side surfaces of the cut upper chord pipe of the arch rib respectively, and symmetrically fix both ends of the base on both sides of the cutting line of the upper chord pipe of the arch rib.

[0016] Step 3: Cut the lower chord pipe and the web of the arch rib.

[0017] Step 4: Connect the strain sensor data receiving instrument in the stress detection mechanism to the strain sensor, measure the stress value borne by the stress conversion device, and adjust the cable forces of the inclined stay cables at both ends of the upper chord pipe of the arch rib until the stress measured by the stress detection mechanism is 0, and then remove the conversion device.

[0018] The method for adjusting the cable forces of the inclined stay cables at both ends of the upper chord pipe of the arch rib in Step 4 is to adjust the stress of the arch rib segment by releasing or tensioning the steel strands.

[0019] Beneficial effects:

[0020] (1) By installing the present invention on the arch rib, the residual stress generated during the cutting of the first segment of the arch rib can be converted to the present invention, preventing the arch rib from undergoing large displacements due to the release of residual stress, thereby reducing the construction risk.

[0021] (2) By monitoring the stress of the present invention, the magnitude of the stress converted to the conversion device can be accurately understood, so as to carry out subsequent construction precisely.

[0022] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present invention and combines with the drawings to elaborate in detail as follows. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0024] Figure 1 It is the elevation layout drawing of the present invention.

[0025] Figure 2 It is the cross-section layout drawing of the present invention.

[0026] Figure 3 It is the elevation view of the base in the present invention.

[0027] Figure 4 It is the side view of the base in the present invention.

[0028] Figure 5 It is the plan view of the base in the present invention.

[0029] In the figure: 1. Base steel plate; 2. Base panel; 3. Load-bearing section steel; 4. Stress detection mechanism; 5. Signal transmission line; 6. Upper chord tube of arch rib; 7. Web; 8. Lower chord tube of arch rib. Specific embodiments

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] According to Figures 1 - 5 A stress conversion device used in the process of removing the arch rib of an arch bridge, characterized in that: it includes a base, a load-bearing section steel 3 and a stress detection mechanism 4; the load-bearing section steel 3 is fixed on the top surface of the base; the stress detection mechanism 4 is connected to the lower bottom surface of the load-bearing section steel 3.

[0033] In actual use, the dumbbell-shaped steel pipe arch section is provided with an upper chord tube 6 of the arch rib and a lower chord tube 8 of the arch rib, and a web 7 is arranged between the upper chord tube 6 of the arch rib and the lower chord tube 8 of the arch rib, as Figure 1 and Figure 2As shown in the figure. During the construction of removing the arch rib of the arch bridge, first, the upper chord tube 6 of the arch rib is cut off. At this time, the lower chord tube 8 and the web 7 of the arch rib are still connected, and the lower chord tube 8 and the web 7 of the arch rib bear the stress of the arch rib. Then, three sets of stress conversion devices are fixedly connected to the upper chord tube 6 of the arch rib. The three sets of stress conversion devices are respectively fixed on the upper surface and both side surfaces of the cut upper chord tube 6 of the arch rib, and the two ends of the base are symmetrically fixed on both sides of the cutting line of the upper chord tube 6 of the arch rib. After the stress conversion device with the stress detection mechanism 4 is installed, the lower chord tube 8 and the web 7 of the arch rib are cut. After the cutting is completed, the entire steel tube arch is only connected by the conversion device. At this time, the stress originally borne by the lower chord tube 8 and the web 7 of the arch rib is transferred to the conversion device. According to the stress value measured by the stress detection mechanism 4, the cable forces of the inclined stay cables at both ends of the steel tube arch are adjusted, that is, the stress of the arch rib segments is adjusted by releasing or tensioning the steel strands. After the stress received by the conversion device is adjusted to 0, the conversion device can be removed.

[0034] By installing the present invention on the arch rib, the residual stress generated during the cutting of the first segment of the arch rib can be converted to the present invention, preventing the arch rib from undergoing large displacements due to the release of residual stress, thereby reducing the construction risk.

[0035] By monitoring the stress of the present invention, the magnitude of the stress converted to the conversion device can be accurately understood, so as to carry out subsequent construction precisely.

[0036] The present invention has a simple structure and is convenient to operate.

[0037] The size of the stress conversion device model in this embodiment is related to the size of the actual arch rib. The larger the diameter of the arch rib, the larger the corresponding conversion device is required. The specific model is designed according to the actual project.

[0038] Embodiment 2:

[0039] According to Figures 1 - 5 A stress conversion device used in the process of removing the arch rib of an arch bridge as shown in the figure. The difference from Embodiment 1 is that: the base includes a base steel plate 1 and a base panel 2; there are multiple base steel plates 1, and at least three rows of multiple base steel plates 1 are arranged in parallel; the base panel 2 is horizontally fixedly connected to the top of the multiple base steel plates 1; a stress-bearing steel section 3 is fixedly connected to the upper surface of the base panel 2.

[0040] In actual use, the base adopts multiple base steel plates 1, which can firmly fix the base panel 2 on the cutting seam and both sides of the upper chord tube 6 of the arch rib, so as to ensure that the cooperation of the stress-bearing steel section 3 and the base can bear the stress after the cutting of the lower chord tube 8 and the web 7 of the arch rib.

[0041] Embodiment 3:

[0042] According to Figure 1 、Figure 2 , Figure 3 and Figure 5 A stress conversion device used in the process of removing the arch rib of an arch bridge, different from the second embodiment in that: at least three base steel plates 1 are symmetrically arranged in each row.

[0043] In actual use, at least three base steel plates 1 are symmetrically arranged in each row to ensure that on the basis of being able to bear the stress it should bear, its own weight is reduced and the cost is saved.

[0044] Embodiment Four:

[0045] According to Figures 1 - 5 A stress conversion device used in the process of removing the arch rib of an arch bridge, different from the second embodiment or the third embodiment in that: a row of base steel plates 1 are respectively fixedly connected to the central axis of the base panel 2 and the lower bottom surfaces of the outer edges on both sides of the central axis.

[0046] In actual use, adopting the above technical solution makes the overall stress of the stress conversion device uniform.

[0047] Embodiment Five:

[0048] According to Figure 2 and Figure 3 A stress conversion device used in the process of removing the arch rib of an arch bridge, different from the second embodiment or the third embodiment in that: the heights of each row of base panels 2 are different; the heights of each row of base panels 2 gradually increase symmetrically from the middle to both sides.

[0049] In actual use, adopting the above technical solution is to enable the base panel 2 to be stably and firmly fixed on the circular arch rib lower chord tube 8.

[0050] Embodiment Six:

[0051] According to Figure 1 and Figure 2 A stress conversion device used in the process of removing the arch rib of an arch bridge, different from the first embodiment in that: the stressed steel section 3 used is an I-beam.

[0052] In actual use, the technical solution of using an I-beam for the stressed steel section 3 can not only well achieve bearing the stress that should be borne after the arch rib lower chord tube 8 and the web 7 are cut, but also the materials are convenient to obtain and the cost is low.

[0053] Embodiment Seven:

[0054] According to Figure 1A stress conversion device used in the process of removing the arch rib of an arch bridge shown, which is different from the first embodiment in that: the stress detection mechanism 4 includes a strain sensor, a signal transmission line 5, and a strain sensor data receiving instrument, and the strain sensor is connected to the strain sensor data receiving instrument through the signal transmission line 5.

[0055] In actual use, one end of the signal transmission line 5 is connected to the strain sensor, and the other end is in a free state; when the stress value needs to be measured, the other end of the signal transmission line 5 is connected to the strain sensor data receiving instrument, and the measured stress value is obtained and displayed through the strain sensor data receiving instrument.

[0056] The use of a strain sensor not only has high resolution, small error, small size, light weight, can measure rapid alternating stress, and the measurement results are convenient for transmission, recording and processing, but also has a low price.

[0057] Embodiment VIII:

[0058] According to Figures 1 - 5 A stress conversion device used in the process of removing the arch rib of an arch bridge shown, which is different from the first embodiment in that: the base includes a base steel plate 1 and a base panel 2; there are multiple base steel plates 1, and at least three rows of the multiple base steel plates 1 are arranged in parallel; the base panel 2 is horizontally fixedly connected to the tops of the multiple base steel plates 1; a stress-bearing steel section 3 is fixedly connected to the upper surface of the base panel 2; at least three base steel plates 1 are symmetrically arranged in each row; a row of base steel plates 1 is fixedly connected to the bottom surface of the central axis and the outer edges on both sides of the central axis of the base panel 2 respectively; the heights of each row of base panels 2 are different; the heights of each row of base panels 2 gradually increase symmetrically from the middle to both sides; the stress-bearing steel section 3 used is an I-beam; the stress detection mechanism 4 includes a strain sensor, a signal transmission line 5, and a strain sensor data receiving instrument, and the strain sensor is connected to the strain sensor data receiving instrument through the signal transmission line 5.

[0059] In actual use, the dumbbell-shaped steel pipe arch section is provided with an upper chord pipe 6 of the arch rib and a lower chord pipe 8 of the arch rib, and a web 7 is arranged between the upper chord pipe 6 of the arch rib and the lower chord pipe 8 of the arch rib, as Figure 1 and Figure 2As shown in the figure. During the construction of removing the arch rib of the arch bridge, first cut off the upper chord tube 6 of the arch rib. At this time, the lower chord tube 8 and the web 7 of the arch rib are still connected, and the lower chord tube 8 and the web 7 of the arch rib bear the stress of the arch rib. Then, fix and connect three sets of stress conversion devices with strain sensors and signal transmission lines 5 on the upper chord tube 6 of the arch rib. The three sets of stress conversion devices are respectively fixed on the upper surface and both side surfaces of the cut upper chord tube 6 of the arch rib through the bases, and the base steel plates 1 at both ends of the base are symmetrically fixed on both sides of the cutting line of the upper chord tube 6 of the arch rib. After the stress conversion device with the stress detection mechanism 4 is installed, cut the lower chord tube 8 and the web 7 of the arch rib. After cutting, the entire steel tube arch is only connected by the conversion device. At this time, the stress originally borne by the lower chord tube 8 and the web 7 of the arch rib is transferred to the conversion device. Connect the strain sensor data receiving instrument to the free end of the signal transmission line 5 to measure the stress value; then, adjust the cable forces of the inclined stay cables at both ends of the steel tube arch, that is, adjust the stress of the arch rib segments by releasing or tensioning the steel strands. After adjusting the stress received by the conversion device to 0, the conversion device can be removed.

[0060] By installing the present invention on the arch rib, the residual stress generated during the cutting of the first segment of the arch rib can be converted to the present invention, preventing the arch rib from undergoing large displacements due to the release of residual stress, thereby reducing the construction risk.

[0061] Through the monitoring of its stress, the present invention can accurately understand the magnitude of the stress converted to the conversion device, so as to precisely carry out subsequent construction.

[0062] The present invention has a simple structure and is convenient to operate.

[0063] The size of the stress conversion device model in this embodiment is related to the size of the actual arch rib. The larger the diameter of the arch rib, the larger the corresponding conversion device is required. The specific model is designed according to the actual project.

[0064] Embodiment Nine:

[0065] A method for stress conversion during the removal of the arch rib of an arch bridge. The cross-section of the dumbbell-shaped steel tube arch of the arch bridge is at least provided with an upper chord tube 6 and a lower chord tube 8 of the arch rib, and a web 7 is arranged between the upper chord tube 6 and the lower chord tube 8 of the arch rib. Using a stress conversion device, the method includes the following steps:

[0066] Step 1: Cut off the upper chord tube 6 of the arch rib;

[0067] Step 2: Take three sets of stress conversion devices with strain sensors and respectively fix them on the upper surface and both side surfaces of the cut upper chord tube 6 of the arch rib, and symmetrically fix both ends of the base on both sides of the cutting line of the upper chord tube 6 of the arch rib;

[0068] Step 3: Cut the lower chord tube 8 and the web 7 of the arch rib;

[0069] Step 4: Connect the strain sensor data receiving instrument in the stress detection mechanism 4 to the strain sensor to measure the stress value borne by the stress conversion device. Adjust the cable forces of the inclined stay cables at both ends of the upper chord tube 6 of the arch rib until the stress measured by the stress detection mechanism 4 is 0, and then remove the conversion device.

[0070] Further, the method of adjusting the cable forces of the inclined stay cables at both ends of the upper chord tube 6 of the arch rib in Step 4 is to adjust the stress of the arch rib segments by releasing or tensioning the steel strands.

[0071] During the construction of removing the arch rib of the arch bridge, first cut the upper chord tube 6 of the arch rib. At this time, the lower chord tube 8 and the web 7 of the arch rib are still connected, and the lower chord tube 8 and the web 7 of the arch rib bear the stress of the arch rib. Then, fix and connect three stress conversion devices with strain sensors and signal transmission lines 5 on the upper chord tube 6 of the arch rib. The three stress conversion devices are respectively fixed on the upper surface and both side surfaces of the cut upper chord tube 6 of the arch rib through the bases, and the base steel plates 1 at both ends of the bases are symmetrically fixed on both sides of the cutting line of the upper chord tube 6 of the arch rib. After the stress conversion device with the stress detection mechanism 4 is installed, cut the lower chord tube 8 and the web 7 of the arch rib. After the cutting is completed, the entire steel tube arch is only connected by the conversion device. At this time, the stress originally borne by the lower chord tube 8 and the web 7 of the arch rib is transferred to the conversion device. Connect the signal transmission line 5 to the strain sensor data receiving instrument to obtain the stress value. By adjusting the cable forces of the inclined stay cables at both ends of the steel tube arch, that is, by releasing or tensioning the steel strands to adjust the stress of the arch rib segments, the stress borne by the conversion device is adjusted to 0, and then the conversion device can be removed to complete the removal of the arch rib of the arch bridge.

[0072] Without conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects. The specific combinations are not elaborated one by one here.

[0073] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0074] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0075] As described above, these are merely the preferred embodiments of the present invention. The present invention will not be limited to these embodiments shown herein, but rather is to be accorded the broadest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent variations, and embellishments made to the above embodiments in accordance with the technical essence of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A method for stress conversion during the demolition of the arch rib of an arch bridge. The cross-section of the dumbbell-shaped steel tube arch of the arch bridge is at least provided with an upper chord tube (6) of the arch rib and a lower chord tube (8) of the arch rib. A web (7) is arranged between the upper chord tube (6) of the arch rib and the lower chord tube (8) of the arch rib. It is characterized in that: The stress conversion device adopted includes a base, a stress-bearing steel section (3), and a stress detection mechanism (4); the stress-bearing steel section (3) is fixed on the top surface of the base; the stress detection mechanism (4) is connected to the lower bottom surface of the stress-bearing steel section (3). It includes the following steps. Step 1: Cut off the upper chord pipe (6) of the arch rib. Step 2: Take three sets of stress conversion devices with strain sensors and fix them on the upper surface and both side surfaces of the cut upper chord pipe (6) of the arch rib respectively, and symmetrically fix the two ends of the base on both sides of the cutting line of the upper chord pipe (6) of the arch rib. Step 3: Cut the lower chord pipe (8) and the web (7) of the arch rib. Step 4: Connect the strain sensor data receiving instrument in the stress detection mechanism (4) to the strain sensor, measure the stress value borne by the stress conversion device, adjust the cable forces of the inclined stay cables at both ends of the upper chord pipe (6) of the arch rib until the stress measured by the stress detection mechanism (4) is 0, and then remove the conversion device.

2. The method for stress conversion during the demolition of an arch rib of an arch bridge according to claim 1, characterized in that: The base includes a base steel plate (1) and a base panel (2); there are multiple base steel plates (1), and multiple base steel plates (1) are arranged in at least three parallel rows; the base panel (2) is horizontally and fixedly connected to the tops of multiple base steel plates (1); the stress-bearing steel section (3) is fixedly connected to the upper surface of the base panel (2).

3. A method for stress conversion during the removal of an arch rib of an arch bridge according to claim 2, characterized in that: At least three base steel plates (1) are symmetrically arranged in each row.

4. A method for stress conversion during the removal of an arch rib of an arch bridge according to claim 2 or 3, characterized in that: A row of base steel plates (1) is fixedly connected to the lower bottom surface of the central axis and the outer edges on both sides of the central axis of the base panel (2) respectively.

5. A method for stress conversion during the removal of an arch rib of an arch bridge according to claim 2 or 3, characterized in that: The heights of each row of base panels (2) are different; the heights of each row of base panels (2) gradually increase symmetrically from the middle to both sides.

6. The method for stress conversion during the demolition of an arch rib of an arch bridge according to claim 1, characterized in that: The stress-bearing steel section (3) adopted is an I-beam.

7. A method for stress conversion during the demolition of an arch rib of an arch bridge according to claim 1, wherein: The stress detection mechanism (4) includes a strain sensor, a signal transmission line (5), and a strain sensor data receiving instrument, and the strain sensor is connected to the strain sensor data receiving instrument through the signal transmission line (5).

8. The method for stress conversion during the demolition of an arch rib of an arch bridge according to claim 1, characterized in that: The method of adjusting the cable forces of the inclined stay cables at both ends of the upper chord pipe (6) of the arch rib in Step 4 is to adjust the stress of the arch rib segment by releasing or tensioning the steel strands.

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