Servo supporting method for overhead sensitive building structure

Abstract

The invention discloses a servo top supporting method for overhead sensitive buildings and structures, and relates to the technical field of traffic engineering. The method comprises the following steps: S1, surveying and setting out; s2, blocking road traffic; s3, equipment entering; s4, top supporting equipment is installed; s5, initial pre-stress force is set; s6, performing automatic compensation; and S7, dismantling. The construction method is an innovative construction method different from a conventional shield underneath passing existing railroad bridge protection mode, the bridge can be supported when shield underneath passing railroad bridge construction is carried out, the risks of collapse and the like caused by excessive settlement of the bridge are avoided, the influence of shield construction is reduced, and the safety of the railroad bridge in the shield construction period is effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of traffic engineering, and in particular to a servo support method for overhead sensitive structures. Background Art

[0002] In recent years, with the acceleration of urban modernization, urban rail transit, as a vital component of urban public transportation, has garnered unprecedented attention and importance for its construction and development due to its safety, speed, punctuality, high capacity, and environmental friendliness. However, due to the increasing density of urban structures, the extension of urban rail transit lines will inevitably encounter various types of structures, inevitably intersecting with existing structures, including sensitive structures such as existing railways and subways, which are primarily crossed by urban rail transit. In response to these situations, ensuring the safety of existing railway and subway line operations has become a major challenge in urban rail transit construction and a top priority in urban rail transit construction and management. Summary of the Invention

[0003] The main purpose of the present invention is to provide a servo support method for overhead sensitive structures to solve the above problems.

[0004] To achieve the above-mentioned object, the present invention provides a method for servo-supporting the roof of an overhead sensitive structure, comprising the following steps: S1. Measure and lay out the position of the servo support system in combination with the drawings; S2. Block the highway traffic and the traffic under the bridge, and keep one express lane on each side of the outer perimeter; S3. Equipment is brought in. After the equipment is brought in, it is placed in place and powered on to test the equipment and check its operation status. S4. Install the supporting equipment, install the supporting device on the top of the steel support, install the steel support under the bridge, and support the bridge; S5. Set the initial prestressing force. During the shield construction process, when the bridge settles, the supporting device applies prestressing force to the bridge. S6, automatic compensation: During shield construction, when the bridge settlement causes the axial force of the support device to decrease, the support device automatically extends to compensate for the axial force; S7. Dismantling: After the shield construction is completed, the top support device and support system will be dismantled.

[0005] Furthermore, in step S4, before installing the supporting device, a trial supporting is performed to ensure normal use of the equipment.

[0006] Furthermore, in step S4, the steel support is divided into a first section steel support and a second section steel support, and the specific installation includes the following steps: A1. Before installing the steel support, first install the top support device on the top of the first section of steel support on the ground; A2. Place the first section of steel support vertically to the top position; A3. Lift the first section of steel support, install the second section of steel support under the second section of steel support, and fix the second section of steel support to the first section of steel support and the ground.

[0007] Furthermore, a rubber bearing pad is provided between the bridge and the supporting device.

[0008] Furthermore, the initial pre-stress is 100KN, and the pre-stress should be applied in stages, namely 30%, 50% and 20% of the total amount, with an interval of 10 minutes each time.

[0009] Furthermore, in step S6, if the pier settlement exceeds 2 mm after the supporting device is loaded to 100% prestressing, the axial force of the supporting device is increased by 20%, and then the axial force is adjusted according to the lateral displacement value.

[0010] Furthermore, adjusting the axial force includes the following steps: A1. The pier continues to sink, and the axial force of the supporting device is further increased by 20%; A2. If the pier is lifted and the cumulative settlement is greater than 2 mm, the axial force of the supporting device is further increased by 20%; A3. If the pier is lifted and the cumulative settlement is less than 2mm and greater than 1mm, the axial force of the supporting device shall be further increased by 10%; A4. The bridge pier is lifted upward and the cumulative settlement is less than 1mm, and the axial force of the supporting device remains unchanged.

[0011] The present invention is an innovative construction method that is different from the conventional shield construction method of passing under the existing railway bridge protection. It can support the bridge when the shield construction passes under the railway bridge, avoid the risk of collapse due to excessive bridge settlement, reduce the impact of shield construction, and effectively ensure the safety of the railway bridge during shield construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a flow chart of a servo support method for overhead sensitive structures according to the present invention. DETAILED DESCRIPTION

[0013] In order to achieve the above-mentioned objectives and effects, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention.

[0014] like Figure 1 As shown, the present invention provides a servo support method for overhead sensitive structures, comprising the following steps: S1. Measure and lay out the position of the servo support system based on the drawings.

[0015] S2. Block highway traffic, block traffic under the bridge, and retain one fast lane on each side of the periphery.

[0016] S3. The equipment is brought into the site. After the equipment is brought into the site, it is placed in place, and the equipment is powered on and tested to check the equipment operation status.

[0017] Specifically, a trial support should be carried out to ensure the normal use of the equipment.

[0018] S4. Install the supporting equipment, install the supporting device on the top of the steel support, install the steel support under the bridge, and support the bridge.

[0019] Specifically, the supporting device can use a hydraulic jack.

[0020] Specifically, the steel support is divided into the first section steel support and the second section steel support. The specific installation includes the following steps: A1. Before installing the steel support, first install the top support device on the top of the first section of steel support on the ground; A2. Place the first section of steel support vertically to the top position; A3. Lift the first section of steel support, install the second section of steel support under the second section of steel support, and fix the second section of steel support to the first section of steel support and the ground.

[0021] Preferably, a nitrile cork rubber gasket is provided between the bridge and the supporting device to avoid local stress concentration and damage to the beam body that may be caused by hard contact between the steel top seat of the supporting device and the bridge.

[0022] Preferably, a servo motor drives a hydraulic pump to deliver hydraulic oil to the jack's cylinder, pushing the piston to move and achieve lifting or lowering. At the same time, high-precision sensors and controllers are equipped to monitor and control the piston's position, speed, and force in real time to achieve precise motion control.

[0023] S5. Set the initial pre-stress. During the shield construction process, if the pier settlement exceeds 2mm, the servo jack is set with an initial pre-stress of about 100KN to tighten the nitrile cork rubber gasket and the bridge.

[0024] Specifically, if the pier settlement exceeds 2 mm after the support device is loaded to 100% prestressing, the axial force of the support device will be increased by 20%, and then the axial force will be adjusted according to the lateral displacement value.

[0025] Adjusting the axial force includes the following steps: A1. The pier continues to sink, and the axial force of the supporting device is further increased by 20%; A2. If the pier is lifted and the cumulative settlement is greater than 2 mm, the axial force of the supporting device is further increased by 20%; A3. If the pier is lifted and the cumulative settlement is less than 2mm and greater than 1mm, the axial force of the supporting device shall be further increased by 10%; A4. The bridge pier is lifted upward and the cumulative settlement is less than 1mm, and the axial force of the supporting device remains unchanged.

[0026] S7. Dismantling: After the shield construction is completed, the top support device and support system will be dismantled.

[0027] S6. Automatic compensation. During shield construction, as the bridge piers settle, the axial force of the steel support gradually increases and stabilizes. If the axial force of the hydraulic jack decreases due to settlement during construction, the axial force will be automatically compensated by the hydraulic jack.

[0028] In this embodiment, inspections are conducted during construction. Inspections are conducted three times daily at 7:00 AM, 12:00 PM, and 6:00 PM, inspecting all servo system equipment. Daily work reports and axial force monitoring reports analyze the day's work and the axial force changes of each compensation device, combined with third-party data.

[0029] In this embodiment, the servo system must have the following functions: 1. It has the functions of real-time pressurization, pressure relief and collection of steel support axial force data, and the data collection error should not be greater than 1%; 2. Equipped with hydraulic and mechanical dual safety locks. The performance of the hydraulic lock should comply with the relevant provisions of the current industry standard "Hydraulic Check Valve" JB / T10364, and the load-bearing capacity of the mechanical lock shall not be less than 1.2 times the rated load-bearing capacity of the system; 3. Equipped with an emergency stop switch that is easy to operate and has reliable performance; 4. Equipped with power-off protection switching device and movable emergency device to ensure that the system can work normally in the event of power outage; 5. It has automatic alarm function and has the function of editing alarm trigger conditions and warning values; 6. A reliable and stable data transmission method is used between the main control system, CNC hydraulic pump station and automatic compensation end; 7. The CNC hydraulic pump station can execute the instructions of the main control system, control the electric oil pump and adjust the oil pressure according to the instructions; 8. The hydraulic pump station can collect data such as axial force and transmit it to the main control system in real time; 9. The hydraulic pump station can monitor and automatically adjust the oil pressure of the compensation device in real time. The oil pressure control accuracy is not less than 0.5Mpa, and the oil pressure measurement accuracy is not less than 0.5%Fs; 10. The hydraulic pump station is equipped with a relief valve, and the safety value of the relief valve can be set. The set safety value of the relief valve shall not exceed 10% of the rated pressure.

[0030] The above descriptions are only preferred embodiments of the present invention, not all embodiments. Anyone should be aware that any structural changes made under the guidance of the present invention, and any technical solutions that are the same or similar to those of the present invention, fall within the scope of protection of the present invention.

Claims

1. A servo support method for overhead sensitive structures, characterized in that: The following steps are involved: S1. Measure and lay out the position of the servo support system in combination with the drawings; S2. Block the highway traffic and the traffic under the bridge, and keep one express lane on each side of the outer perimeter; S3. Equipment is brought in. After the equipment is brought in, it is placed in place and powered on to test the equipment to check its operation status. S4. Install the supporting equipment, install the supporting device on the top of the steel support, install the steel support under the bridge, and support the bridge; S5. Set the initial prestressing force. During the shield construction process, when the bridge settles, the supporting device applies prestressing force to the bridge. S6, automatic compensation: During shield construction, when the bridge settlement causes the axial force of the support device to decrease, the support device automatically extends to compensate for the axial force; S7. Dismantling: After the shield construction is completed, the top support device and support system will be dismantled.

2. The method for supporting the servo top of an overhead sensitive structure according to claim 1, characterized in that: In step S4, before installing the supporting device, a trial supporting is performed to ensure the normal use of the equipment.

3. The method for supporting the servo top of an overhead sensitive structure according to claim 1, wherein: In step S4, the steel support is divided into a first section steel support and a second section steel support. The specific installation includes the following steps: A1. Before installing the steel support, first install the top support device on the top of the first section of steel support on the ground; A2. Place the first section of steel support vertically to the top position; A3. Lift the first section of steel support, install the second section of steel support under the second section of steel support, and fix the second section of steel support to the first section of steel support and the ground.

4. The method for supporting the servo top of an overhead sensitive structure according to claim 3, characterized in that: A rubber bearing pad is provided between the bridge and the supporting device.

5. The method for supporting the servo top of an overhead sensitive structure according to claim 1, wherein: The initial pre-stress is 100KN. The pre-stress should be applied in stages, namely 30%, 50% and 20% of the total amount, with an interval of 10 minutes each time.

6. The method for supporting the servo top of an overhead sensitive structure according to claim 1, wherein: In step S6, if the pier settlement exceeds 2 mm after the supporting device is loaded to 100% prestressing, the axial force of the supporting device is increased by 20%, and then the axial force is adjusted according to the lateral displacement value.

7. The method for supporting the servo top of an overhead sensitive structure according to claim 6, wherein: Adjusting the axial force includes the following steps: A1. The pier continues to sink, and the axial force of the supporting device is further increased by 20%; A2. If the pier is lifted and the cumulative settlement is greater than 2 mm, the axial force of the supporting device is further increased by 20%; A3. If the pier is lifted and the cumulative settlement is less than 2mm and greater than 1mm, the axial force of the supporting device shall be further increased by 10%; A4. The bridge pier is lifted upward and the cumulative settlement is less than 1mm, and the axial force of the supporting device remains unchanged.

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