Fixing method for maintaining demolition stability of lagging jack

Abstract

The invention discloses a fixing method for maintaining demolition stability of an arch center, and particularly relates to the field of arch center demolition, which comprises the following steps: step 1, carrying out on-site exploration on a steel arch center to be demolited, and recording related exploration data; 2, performing split scheme design according to field investigation data, calling related workers for discussion, and determining scheme implementation safety; and 3, staffs are collected to establish a construction range area, and protective devices are installed around the construction area for isolation. The stress monitoring modules are established on the supporting points, in the dismantling process, data changes of the stress points can be recorded and uploaded at any time, data analysis is carried out, risks are evaluated, accidents are avoided, a supporting mechanism and auxiliary supporting are established in time under the condition of insufficient stress, and the dismantling efficiency is improved. And in the dismantling process, symmetrical dismantling from the two ends to the midspan is adopted, and structural instability caused by single-side stress is avoided.

Description

Technical Field

[0001] The present invention relates to the field of arch frame dismantling, and more particularly to a fixing method for maintaining the stability of the arch frame dismantling. Background Art

[0002] When steel arch frames (such as steel box arches and truss arches) serve as the main arch ring of an arch bridge, the curved shape of the arch converts the bridge deck load (vehicles, pedestrians) into axial pressure, which is then transmitted to the abutments or piers at both ends. For example, for a steel arch bridge with a large span in a valley, the main arch frame needs to be processed into an arc or parabola according to the designed curvature. The strong tensile and compressive properties of steel are utilized to reduce the pressure of the structure's deadweight on the foundation. This is suitable for steep valleys and locations with limited foundation bearing capacity. During the construction of a concrete arch bridge, steel truss arch frames are used as temporary supports for pouring the main arch ring. Once the concrete reaches more than 85% of the design strength, the steel arch frame is evenly removed using a sand box unloading device.

[0003] During the dismantling process of the existing steel arch frame, the stress conditions of the steel arch frame support are constantly changing, and some parts are prone to collapse due to insufficient stress, leading to accidents. The dismantling of the steel arch frame is very dangerous. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a fixing method for maintaining the stability of the arch frame dismantling. By setting up a force monitoring module on each support point, during the dismantling process, the data changes of each force point will be recorded and uploaded at any time, and data analysis will be performed to assess the risks to avoid accidents. In the case of insufficient force, a support mechanism will be established in time to provide auxiliary support and prevent components from falling. In addition, the dismantling process adopts symmetrical dismantling from both ends to the mid-span to avoid structural instability caused by unilateral force.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a fixing method for maintaining the stability of arch dismantling, the steps of which are as follows:

[0006] Step 1: Conduct on-site survey of the steel arch frame that needs to be demolished and record relevant survey data;

[0007] Step 2: Design a splitting plan based on the on-site survey data, convene relevant staff for discussion, and ensure the safety of the plan implementation;

[0008] Step 3: Gather the staff to establish the construction area, install protective equipment around the construction area to isolate it, clean the construction site, prepare the necessary demolition tools, transport the demolition tools to the construction site, and inspect the prepared tools to ensure their safe use;

[0009] Step 4: Record and mark the support points on the steel arch frame, then install monitoring equipment at the marked support points to establish a support point force monitoring system to monitor the force at each support point of the steel arch frame. At the same time, install monitoring equipment at the construction site for comprehensive monitoring;

[0010] Step 5: Build reinforcement structures at the main support points to balance the wind load. The specific calculation can be based on the self-supporting capacity of the steel arch frame, the size of the wind load, etc.

[0011] Step 6: Arrange construction workers to start dismantling the steel arch from both sides toward the center. First, remove the formwork, scaffolding, and guardrail ancillary facilities on the arch. During dismantling, ensure that the components are lowered slowly to prevent them from falling. Then, use gas cutting and hydraulic cutting equipment to cut the steel components at the predetermined locations. Finally, remove the connecting supports between the arch and the pier. Before dismantling, confirm that the main structure has been fully stressed.

[0012] Step 7: Use hoisting equipment to move the dismantled steel frame to an open space for placement. A dedicated person is required to direct the placement and collect the disassembled bolts and nuts.

[0013] Step 8: Use the transport device to transport the dismantled steel frame and other parts in categories for recycling. During transportation, the components must be well protected to avoid collision and deformation. Oversized components must obtain a transportation permit.

[0014] Step 9: Clean up the garbage from the construction site, remove the surrounding protective devices in turn, restore the surrounding traffic, remove the monitoring equipment and lighting system in the construction site, and collect construction tools and safety protection tools.

[0015] Furthermore, the items that require on-site inspection in step 1 include whether the bolts and welds of the steel arch frame are firm, the integrity of the support system, whether there is deformation, rust and damage, and whether the concrete is completely solidified.

[0016] Furthermore, the demolition tools prepared in step three include gas cutting, hydraulic shears, temporary supports, monitoring instruments, and wire ropes. Protective equipment for the staff also needs to be prepared in step three, including helmets and safety ropes, which need to be checked regularly during use.

[0017] Furthermore, the monitoring equipment installed in step 4 includes a stress sensor and a displacement sensor.

[0018] Furthermore, the reinforcement structure in step five is made of φ48×3.2 steel pipes and I-beams and other profiles. The longitudinal and transverse reinforcement profiles are connected by fasteners, which is easy to operate and avoids high-altitude welding operations in narrow spaces.

[0019] Furthermore, in step six, during the demolition process, the conditions of each stress point need to be monitored in real time through the stress monitoring system. When abnormal data of a stress point appears, the demolition process should be stopped immediately and the unexpected situation should be checked and eliminated.

[0020] Furthermore, in step seven, the collected steel frames, bolts, and nuts are classified and numbered according to their models and types, and are placed in categories. During the classification process, the damaged parts that cannot be repaired are picked out and placed separately.

[0021] Furthermore, when the steel frames and other parts in step eight are transported out of the construction site, the quantity of the steel frames and other parts needs to be recorded.

[0022] Furthermore, in step nine, before dismantling the monitoring equipment and lighting system, the power supply must be disconnected to ensure the safety of the dismantling and to check whether the construction tools and safety protection tools are missing.

[0023] The technical effects and advantages of the present invention are as follows:

[0024] The present invention establishes a force monitoring module at each support point. During the dismantling process, the data changes of each force point will be recorded and uploaded at any time, and data analysis will be performed to assess the risks to avoid accidents. In the case of insufficient force, a support mechanism will be established in time to provide auxiliary support and prevent parts from falling. In addition, the dismantling process adopts symmetrical disassembly from both ends to the mid-span to avoid structural instability caused by unilateral force. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the arch frame of the present invention.

[0026] Figure 2 It is an overall top view of the arch frame of the present invention.

[0027] Figure 3 It is a structural schematic diagram of the arch frame of the present invention in a disassembled state.

[0028] Figure 4 This is a diagram of the arch frame splitting and reinforcement according to the present invention. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] according to Figure 1-4A fixing method for maintaining the stability of an arch frame during dismantling is shown, and the steps are as follows:

[0031] Step 1: Conduct an on-site survey of the steel arch frame to be dismantled and record relevant survey data. Items that require on-site survey in Step 1 include whether the bolts and welds of the steel arch frame are firm, the integrity of the support system, whether there is any deformation, corrosion or damage, and whether the concrete is completely solidified.

[0032] Step 2: Design a splitting plan based on the on-site survey data, convene relevant staff for discussion, and ensure the safety of the plan implementation;

[0033] Step 3: Gather the staff to establish the construction scope area, install protective devices around the construction area to isolate it, clean the construction site, prepare the necessary demolition tools, transport the demolition tools to the construction site, and inspect the prepared tools to ensure their safety. The demolition tools prepared in step 3 include gas cutting, hydraulic shears, temporary supports, monitoring instruments, and wire ropes. Protective equipment for the staff also needs to be prepared in step 3, including helmets and safety ropes, which need to be inspected regularly during use;

[0034] Step 4: Record and mark the support points on the steel arch frame, then install monitoring equipment at the marked support points to establish a support point force monitoring system to monitor the force at each support point of the steel arch frame. At the same time, install monitoring equipment at the construction site for comprehensive monitoring. The monitoring equipment installed in step 4 includes stress sensors and displacement sensors.

[0035] Step 5: Build a reinforcement structure at the main support point to balance the wind load. The specific calculation can be based on the self-supporting capacity of the steel arch frame, the size of the wind load, etc. The reinforcement structure in step 5 uses φ48×3.2 steel pipes and I-beams and other profiles. The longitudinal and transverse reinforcement profiles are connected by fasteners, which is easy to operate and avoids high-altitude welding operations in narrow spaces.

[0036] Step 6: Arrange construction personnel and start dismantling from both sides of the steel arch frame toward the middle. First, remove the formwork, scaffolding, and guardrail ancillary facilities on the arch frame. During dismantling, ensure that the components are lowered slowly to avoid falling. Then use gas cutting and hydraulic cutting equipment to cut the steel components at the predetermined position. Finally, remove the connecting supports between the arch frame and the pier. Before dismantling, confirm that the main structure has been fully stressed. During the dismantling process in step 6, the force monitoring system needs to monitor the situation of each stress point in real time. When abnormal data of a stress point appears, the dismantling process should be stopped immediately and the unexpected situation should be checked and eliminated.

[0037] Step 7: The dismantled steel frame is moved to an open space by hoisting equipment for placement. A dedicated person is required to direct the placement and collect the disassembled bolts and nuts. In step 7, the collected steel frames, bolts, and nuts are classified and numbered according to their models and types, and are placed in categories. During the classification process, the damaged parts that cannot be removed are picked out and placed separately.

[0038] Step 8: Use transportation equipment to transport the dismantled steel frames and other parts in categories for recycling. During transportation, the components must be well protected to avoid collision and deformation. Oversized components require transportation permits. When the steel frames and other parts in step 8 are transported out of the construction site, the quantity of the steel frames and other parts must be recorded.

[0039] Step nine: Clean up the garbage from the construction site, remove the surrounding protective devices in turn, restore the surrounding traffic, remove the monitoring equipment and lighting system in the construction site, and collect the construction tools and safety protection tools. In step nine, the power supply must be disconnected before removing the monitoring equipment and lighting system to ensure the safety of the removal, and check whether the construction tools and safety protection tools are missing.

Claims

1. A fixing method for maintaining the stability of arch dismantling, characterized by: The steps are as follows: Step 1: Conduct on-site survey of the steel arch frame that needs to be demolished and record relevant survey data; Step 2: Design a splitting plan based on the on-site survey data, convene relevant staff for discussion, and ensure the safety of the plan implementation; Step 3: Gather the staff to establish the construction area, install protective equipment around the construction area to isolate it, clean the construction site, prepare the necessary demolition tools, transport the demolition tools to the construction site, and inspect the prepared tools to ensure their safe use; Step 4: Record and mark the support points on the steel arch frame, then install monitoring equipment at the marked support points to establish a support point force monitoring system to monitor the force at each support point of the steel arch frame. At the same time, install monitoring equipment at the construction site for comprehensive monitoring; Step 5: Build reinforcement structures at the main support points to balance the wind load. The specific calculation can be based on the self-supporting capacity of the steel arch frame, the size of the wind load, etc. Step 6: Arrange construction workers to start dismantling the steel arch from both sides toward the center. First, remove the formwork, scaffolding, and guardrail ancillary facilities on the arch. During dismantling, ensure that the components are lowered slowly to prevent them from falling. Then, use gas cutting and hydraulic cutting equipment to cut the steel components at the predetermined locations. Finally, remove the connecting supports between the arch and the pier. Before dismantling, confirm that the main structure has been fully stressed. Step 7: Use hoisting equipment to move the dismantled steel frame to an open space for placement. A dedicated person is required to direct the placement and collect the disassembled bolts and nuts. Step 8: Use the transport device to transport the dismantled steel frame and other parts in categories for recycling. During transportation, the components must be well protected to avoid collision and deformation. Oversized components must obtain a transportation permit. Step 9: Clean up the garbage from the construction site, remove the surrounding protective devices in turn, restore the surrounding traffic, remove the monitoring equipment and lighting system in the construction site, and collect construction tools and safety protection tools.

2. A fixing method for maintaining stability during arch removal according to claim 1, characterized in that: Items that require on-site inspection in step 1 include whether the bolts and welds of the steel arch frame are firm, the integrity of the support system, whether there is deformation, rust and damage, and whether the concrete is completely solidified.

3. The fixing method for maintaining the stability of arch dismantling according to claim 1 is characterized in that: The demolition tools prepared in step three include gas cutting, hydraulic shears, temporary supports, monitoring instruments, and wire ropes. Protective equipment for the staff also needs to be prepared in step three, including helmets and safety ropes, which need to be checked regularly during use.

4. The fixing method for maintaining stability of arch dismantling according to claim 1, characterized in that: The monitoring equipment installed in step 4 includes a stress sensor and a displacement sensor.

5. The fixing method for maintaining stability of arch dismantling according to claim 1, characterized in that: The reinforcement structure in step five is made of φ48×3.2 steel pipes and I-beams and other profiles. The longitudinal and transverse reinforcement profiles are connected by fasteners, which is easy to operate and avoids high-altitude welding operations in narrow spaces.

6. The fixing method for maintaining stability of arch dismantling according to claim 1, characterized in that: In step six, during the demolition process, the conditions of each stress point need to be monitored in real time through the stress monitoring system. When the stress point data is abnormal, the demolition process should be stopped immediately and the unexpected situation should be checked and eliminated.

7. The fixing method for maintaining stability of arch dismantling according to claim 1, characterized in that: In the step seven, the collected steel frames, bolts and nuts are classified and numbered according to their models and types, and are placed in categories. During the classification process, the damaged parts that cannot be repaired are picked out and placed separately.

8. The fixing method for maintaining stability of arch dismantling according to claim 1, characterized in that: When the steel frames and other parts in step eight are transported out of the construction site, the quantity of the steel frames and other parts needs to be recorded.

9. The fixing method for maintaining stability of arch dismantling according to claim 1, characterized in that: In step nine, before dismantling the monitoring equipment and lighting system, the power supply must be disconnected to ensure the safety of the dismantling and to check whether the construction tools and safety protection tools are missing.

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