A gas film construction method for synchronous entry of a bucket wheel machine

Abstract

The application discloses a kind of pneumatic membrane construction methods of synchronous entry of bucket wheel machine, comprising: step S1, inflatable archway prefabrication;Step S2, site preparation;Step S3, archway assembly and positioning;Step S4, pneumatic membrane suspension fixation;Step S5, step-by-step inflatable forming;Step S6, bucket wheel machine entry;Step S7, subsequent processing.The application is by arranging independent inflatable archway as temporary support framework in the pneumatic membrane, forms the clearance passage satisfying the net of bucket wheel machine passing by using the air pressure forming characteristics of inflatable archway, without large hoisting equipment and pneumatic membrane overall closed inflatable, realizes the synchronous entry operation of bucket wheel machine, solves the problem that pneumatic membrane cannot be inflated as a whole, relies on large hoisting equipment to support membrane body for the entry of bucket wheel machine in the existing pneumatic membrane warehouse construction under semi-closed state, leading to high construction cost, low efficiency, large safety risk.

Description

Technical Field

[0001] This invention belongs to the field of air-supported membrane structure construction technology, specifically a method for air-supported membrane structure construction with simultaneous entry of bucket wheel excavators. Background Technology

[0002] In the construction of air-supported membrane structures in the rear storage yard of a wharf, these structures typically feature large spans (140m) and heights (48m). Furthermore, a bucket wheel excavator (28m high, 12m wide) needs to be introduced into the air-supported membrane structure during construction for subsequent material transfer operations. Current construction techniques require the bucket wheel excavator to first raise the entire air-supported membrane structure to create sufficient clearance before it can be installed. However, this process presents several challenges in actual construction. In the early stages of air-supported membrane construction, the membrane is in a semi-closed state and does not meet the conditions for overall inflation and shaping, so it cannot be supported by air pressure on its own. Traditional solutions rely on dozens of large cranes to hoist the air-supported membrane structure as a whole, resulting in extremely high equipment rental and scheduling costs. Furthermore, high-altitude operations are difficult to coordinate and are susceptible to severe weather conditions such as strong winds and typhoons at the dock. During crane hoisting, the air film is prone to wrinkles and tears, and has poor support stability, posing safety risks such as overturning and collision. The construction period is long, and the efficiency of crane operation is low, making it difficult to meet the tight construction schedule requirements of the dock project.

[0003] Therefore, there is an urgent need for a construction method that does not require large lifting equipment, is suitable for semi-enclosed air film conditions, and can quickly create clearance for the bucket wheel excavator to enter the site, thus overcoming the shortcomings of existing technologies. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a method for the synchronous entry of bucket wheel excavators into the air-supported membrane structure. This method solves the problems in existing air-supported membrane structure construction, where the membrane structure cannot be fully inflated in a semi-enclosed state, and large lifting equipment is required to support the membrane structure for the bucket wheel excavator to enter the site, resulting in high construction costs, low efficiency, and significant safety risks.

[0005] The technical solution to achieve the above objectives is: A method for constructing an air-supported membrane structure with a bucket wheel excavator entering the site simultaneously includes: Step S1, Prefabrication of inflatable arches: Based on the size parameters of the bucket wheel excavator, prefabricate several independent inflatable arches; Step S2, Site preparation: On the hardened ground of the air-supported membrane structure construction area, mark the installation position lines of the inflatable arch at the preset intervals, and fix the ground anchor bolts or set up the counterweight blocks at the installation positions as the bottom anchor points of the inflatable arch. Step S3, Arch Assembly and Positioning: Lay the prefabricated inflatable arch flat at the installation position line, connect the inflation pipeline, and fix it with the ground anchor bolts or counterweights through the bottom anchoring structure, so that the position of the arch is aligned with the preset travel route of the bucket wheel machine. Step S4, Air membrane suspension and fixation: Lay the semi-enclosed air membrane flat on the outside of the uninflated arch, and fix it to the outer surface of the inflated arch by the Velcro and hanging rings preset on the inside of the air membrane. Step S5, step-by-step inflation and shaping: Start the blower to inflate the inflatable archway. First, inflate it to a semi-rigid state so that the archway can be initially erected and its verticality adjusted. Then, gradually increase the pressure to the working pressure so that the archway is fully formed. The inflatable archway uses its own air pressure and the weight of the air film to support the air film and form a continuous passageway. Step S6, Bucket Wheel Excavator Entry: After confirming that the clearance height is ≥30m and the passage width is ≥14m in the passage supported by the inflatable arch, guide the bucket wheel excavator to advance along the preset route to the designated position inside the air-supported membrane structure. Step S7, follow-up processing: After the bucket wheel excavator enters the site, retain the inflatable arch as a temporary support between the air film chamber and the bucket wheel excavator, or after the air film is completely sealed and inflated, deflate and remove the inflatable arch and recycle it for reuse.

[0006] Preferably, in step S1, the dimensions of the bucket wheel excavator include the height H and the width W of the bucket wheel excavator. The design height of the inflatable arch is ≥ H+2m, the design span is ≥ W+2m, and it is made of high-strength TPU (thermoplastic polyurethane elastomer resin) or PVDF (polyvinylidene fluoride) membrane material with internal reinforcing ribs and an anchoring structure at the bottom.

[0007] Preferably, in step S1, the cross-section of the inflatable arch is elliptical or circular, with a cross-sectional diameter of 1.2-1.5m, and the arrangement spacing along the length of the air-supported membrane chamber is 20-25m.

[0008] Preferably, in step S3, the inflation pipeline of the inflatable arch is equipped with a pressure monitoring device and a pressure relief valve for real-time monitoring of the air pressure inside the arch. When the internal air pressure of the inflatable arch exceeds 0.8 bar, it will automatically depressurize. When the internal air pressure of the inflatable arch drops below 0.6 bar, it will automatically replenish air.

[0009] Preferably, in step S4, the connection points between the inner side of the air film and the inflatable arch are evenly distributed along the length of the arch, with a spacing of ≤3m, and wear-resistant pads are provided at the connection points.

[0010] Preferably, in step S4, the Velcro is installed every 3m along the length of the arch.

[0011] Preferably, in step S5, if strong winds occur during inflation, inflation is suspended, and 2-3 galvanized steel wire ropes with a diameter of 12-16mm are strung on the top of the inflation arch as guy ropes. The guy ropes are kept away from the bucket wheel excavator's travel route and anchored to fixed points on the ground to form a triangular stability system.

[0012] Preferably, in step S6, before the bucket wheel excavator enters the site, limit signs and anti-collision buffer devices are set on both sides of the passage to guide the bucket wheel excavator to pass in the center.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1) In this invention, the inflatable arch is inflated independently without the need for the air film to be completely sealed, which solves the problem that the air film cannot be inflated and formed in the early stage. 2) This invention only requires lightweight equipment such as blowers and small air compressors, which greatly reduces equipment costs and is not affected by severe weather. 3) The invention can complete the inflation and molding of a single arch in 1-2 hours, and multiple arches can be operated in parallel, which can support a passage for the bucket wheel excavator to enter the site within 1 day, greatly shortening the construction period and improving construction efficiency; 4) This invention eliminates the need for high-altitude operations. The inflatable arch is anchored at the bottom and forms a stable system with guy ropes. The air membrane is firmly connected to the arch, avoiding risks such as overturning and tearing. 5) The inflatable archway of this invention can be reused, reducing material waste costs, and the construction process does not require complex coordination, significantly reducing labor costs; 6) The arch parameters can be adjusted according to the size of the bucket wheel excavator and the specifications of the air membrane warehouse, making it suitable for various large-span, high-cleanliness air membrane warehouse construction scenarios, especially suitable for wharf rear storage yard projects.

[0014] In summary, this invention solves the problems of high construction costs, low efficiency, and high safety risks in the construction of existing air-supported membrane structures, where the membrane cannot be fully inflated in a semi-enclosed state and relies on large lifting equipment to support the membrane for the bucket wheel excavator to enter the site. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of an air-supported membrane construction method for synchronous entry of a bucket wheel excavator according to the present invention; Figure 2 This is a schematic diagram showing the positions of the inflatable arch, air film, and bucket wheel excavator in this invention; Figure 3 This is a schematic diagram of an inflatable archway after inflation in this invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figures 1-3 As shown, a method for constructing an air-supported membrane structure with a bucket wheel excavator entering the site simultaneously includes: Step S1, Prefabrication of inflatable arches: Based on the size parameters of the bucket wheel excavator, prefabricate several independent inflatable arches.

[0018] In this embodiment, the dimensions of the bucket wheel excavator include the height H and the width W of the bucket wheel excavator. The design height of the inflatable arch is ≥ H+2m, the design span is ≥ W+2m, and it is made of high-strength TPU or PVDF membrane material with internal reinforcing ribs and an anchoring structure at the bottom.

[0019] In the embodiment, the cross-section of the inflatable arch is elliptical or circular, with a cross-sectional diameter of 1.2-1.5m, and the arrangement spacing along the length of the air-supported membrane chamber is 20-25m to ensure uniform air-supported membrane and continuous channel.

[0020] Step S2, Site preparation: On the hardened ground of the air-supported membrane structure construction area, mark the installation position lines of the inflatable arch at preset intervals, and fix ground anchor bolts or set up counterweights at the installation positions as the bottom anchor points of the inflatable arch.

[0021] Step S3, Arch Assembly and Positioning: Lay the prefabricated inflatable arch flat at the installation position line, connect the inflation pipeline, and fix it with the ground anchor bolts or counterweights through the bottom anchoring structure, so that the position of the arch is aligned with the preset travel route of the bucket wheel machine.

[0022] In this embodiment, the inflation pipeline of the inflatable arch is equipped with a pressure monitoring device and a pressure relief valve to monitor the air pressure inside the arch in real time. When the internal air pressure of the inflatable arch exceeds 0.8 bar, it will automatically depressurize. When the internal air pressure of the inflatable arch drops below 0.6 bar, it will automatically replenish air.

[0023] Step S4, Air membrane suspension and fixation: Lay the semi-enclosed air membrane flat on the outside of the uninflated arch, and fix it to the outer surface of the inflatable arch by using the Velcro and hanging rings preset on the inside of the air membrane.

[0024] In this embodiment, the connection points between the inner side of the air membrane and the inflatable arch are evenly distributed along the length of the arch with a spacing of ≤3m. Wear-resistant pads are provided at the connection points to avoid local stress concentration in the air membrane.

[0025] In this embodiment, a Velcro strip is installed every 3m along the length of the archway.

[0026] Step S5, step-by-step inflation and shaping: Start the blower to inflate the inflatable archway. First, inflate it to a semi-rigid state to initially stand the archway and adjust its verticality. Then, gradually increase the pressure to the working pressure to fully shape the archway. The inflatable archway uses its own air pressure and the weight of the air film to support the air film and form a continuous passageway.

[0027] In this embodiment, if strong winds occur during inflation, inflation is suspended, and 2-3 galvanized steel wire ropes with a diameter of 12-16mm are strung on the top of the inflation arch as guy ropes. The guy ropes are kept away from the bucket wheel excavator's passage and anchored to fixed points on the ground to form a triangular stability system to resist crosswind loads.

[0028] Step S6, Bucket Wheel Conveyor Entry: After confirming that the clearance height is ≥30m and the passage width is ≥14m within the passage supported by the inflatable arch, guide the bucket wheel conveyor to advance along the preset route to the designated position inside the air-supported membrane structure.

[0029] In this embodiment, before the bucket wheel excavator enters the site, limit signs and anti-collision buffer devices are set on both sides of the passage to guide the bucket wheel excavator to pass in the center and avoid collision with the inflatable arch and air membrane.

[0030] Step S7, follow-up processing: After the bucket wheel excavator enters the site, retain the inflatable arch as a temporary support between the air film chamber and the bucket wheel excavator, or after the air film is completely sealed and inflated, deflate and remove the inflatable arch and recycle it for reuse.

[0031] Specific embodiments Step S1: Prefabrication of the inflatable arch 1) Dimensional design: Based on the bucket wheel excavator's height of 28m and width of 12m, the inflatable archway is designed to be 30m high (with a 2m safety margin) and 14m wide (with a 1m safety margin on each side) to ensure smooth passage of the bucket wheel excavator; Structural design: The arch has a semi-circular cross-section with polyester fiber reinforcing ribs along its length to improve structural strength and wind resistance; a metal anchor plate with pre-drilled bolt holes is installed at the bottom of the arch for connection with ground anchors. 2) Material selection: High-strength TPU film with a thickness of ≥1.2mm and a tensile strength of ≥30kN / m is used. It has good airtightness, wear resistance and UV resistance, and can be reused.

[0032] Step S2: Site Preparation Clean the hardened ground in the construction area of ​​the air-supported membrane structure to ensure that there are no sharp objects and the flatness deviation is ≤5mm / m; Along the pre-set travel route of the bucket wheel excavator, mark the installation positions of the inflatable arch at intervals of 20-25m. Pre-embed ground anchor bolts or place counterweights at each installation position to ensure that the bottom of the arch is firmly anchored.

[0033] Step S3: Arch assembly and positioning Lay the prefabricated inflatable archway flat at the installation position line, unfold it and adjust its position so that the center line of the archway coincides with the travel path of the bucket wheel excavator; The arch is secured to the ground anchor bolts by anchoring the bottom plate, or the anchoring plate is compacted by weight blocks to prevent the arch from slipping or overturning after being inflated. Each archway is equipped with an independent blower and air pressure monitoring device to ensure that the inflation process is controllable.

[0034] Step S4: Air membrane suspension and fixation Lay the semi-enclosed air membrane flat around the uninflated arches, and adjust the position of the air membrane so that it covers all the arches. The air membrane is fixed to the outer surface of the inflatable arch by pre-installed Velcro on the inside (one every 3m along the length of the arch), or by connecting it to the hanging points at the top of the arch through hanging rings, ensuring that the air membrane and the arch are tightly fitted without loosening or sagging.

[0035] Step S5: Step-by-step inflation molding Start the blower and slowly inflate the archway with air. Stop when the air pressure reaches 0.4-0.5 bar. At this point, the archway is in a semi-rigid state. Manually adjust the verticality of the archway to ensure that all archways are at the same height and arranged neatly. Continue inflating to a working pressure of 0.6-0.8 bar, and the arch will be fully formed into a stable arch structure. At this point, the top height of the arch is 30m and the bottom span is greater than 14m, forming a continuous arched passage. The internal clearance height of the passage is ≥30m and the passage width is ≥14m, which meets the passage conditions of the bucket wheel excavator. During the inflation process, the pressure is monitored in real time by an air pressure monitoring device. If strong winds occur, inflation is suspended and guy ropes are installed. The operation can continue once the wind weakens.

[0036] Step S6: Bucket wheel excavator enters the site Clear debris from the passageway, set up red and white limit signs on both sides of the passageway, and install rubber anti-collision buffer devices at the bottom of the archway; A designated person was assigned to direct and guide the bucket wheel excavator to advance slowly along the center line of the passage at a speed of ≤5km / h to avoid collisions with the arch and air film. After the bucket wheel excavator reaches the designated position, it should be parked securely and braking measures should be taken.

[0037] Step S7: Post-processing After the air-supported membrane is sealed and inflated to the design pressure, the air is slowly released from the inflatable arch, the inflation pipes and guy ropes are removed, and the arch is retrieved and folded for use in other subsequent construction sections or for storage.

[0038] This invention utilizes independent inflatable arches within the air-supported membrane structure as a temporary support framework. The air pressure forming characteristics of these arches support the membrane, creating a clear passage for bucket wheel excavators. This eliminates the need for large lifting equipment and a fully enclosed air-supported membrane structure, enabling simultaneous entry and operation of the bucket wheel excavator. The core steps include: inflatable arch design and prefabrication, ground anchoring and assembly, air-supported membrane suspension and fixation, phased inflation forming, bucket wheel excavator passage, and subsequent processing. This invention is suitable for large-span air-supported membrane structures such as those located in wharf rear storage yards. It features low construction costs, high efficiency, strong safety, reusable core components, and significantly shortened construction time, demonstrating high practicality and economy.

[0039] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for air-supported membrane construction with synchronous entry of a bucket wheel excavator, characterized in that, include: Step S1, Prefabrication of inflatable arches: Based on the size parameters of the bucket wheel excavator, prefabricate several independent inflatable arches; Step S2, Site preparation: On the hardened ground of the air-supported membrane structure construction area, mark the installation position lines of the inflatable arch at the preset intervals, and fix the ground anchor bolts or set up the counterweight blocks at the installation positions as the bottom anchor points of the inflatable arch. Step S3, Arch Assembly and Positioning: Lay the prefabricated inflatable arch flat at the installation position line, connect the inflation pipeline, and fix it with the ground anchor bolts or counterweights through the bottom anchoring structure, so that the position of the arch is aligned with the preset travel route of the bucket wheel machine. Step S4, Air membrane suspension and fixation: Lay the semi-enclosed air membrane flat on the outside of the uninflated arch, and fix it to the outer surface of the inflated arch by the Velcro and hanging rings preset on the inside of the air membrane. Step S5, step-by-step inflation and shaping: Start the blower to inflate the inflatable archway. First, inflate it to a semi-rigid state so that the archway can be initially erected and its verticality adjusted. Then, gradually increase the pressure to the working pressure so that the archway is fully formed. The inflatable archway uses its own air pressure and the weight of the air film to support the air film and form a continuous passageway. Step S6, Bucket Wheel Excavator Entry: After confirming that the clearance height is ≥30m and the passage width is ≥14m in the passage supported by the inflatable arch, guide the bucket wheel excavator to advance along the preset route to the designated position inside the air-supported membrane structure. Step S7, follow-up processing: After the bucket wheel excavator enters the site, retain the inflatable arch as a temporary support between the air film chamber and the bucket wheel excavator, or after the air film is completely sealed and inflated, deflate and remove the inflatable arch and recycle it for reuse.

2. The method for synchronous entry of a bucket wheel excavator into an air-supported membrane structure according to claim 1, characterized in that, In step S1, the dimensions of the bucket wheel excavator include the height H and the width W of the bucket wheel excavator. The design height of the inflatable arch is ≥ H+2m, the design span is ≥ W+2m, it is made of high-strength TPU or PVDF membrane material, with internal reinforcing ribs and an anchoring structure at the bottom.

3. The method for synchronous entry of a bucket wheel excavator into an air-supported membrane structure according to claim 1, characterized in that, In step S1, the cross-section of the inflatable arch is elliptical or circular, with a cross-sectional diameter of 1.2-1.5m, and the arrangement spacing along the length of the air-supported membrane chamber is 20-25m.

4. The method for synchronous entry of a bucket wheel excavator into an air-supported membrane structure according to claim 1, characterized in that, In step S3, the inflation pipeline of the inflatable arch is equipped with a pressure monitoring device and a pressure relief valve to monitor the air pressure inside the arch in real time. When the internal air pressure of the inflatable arch exceeds 0.8 bar, it will automatically depressurize. When the internal air pressure of the inflatable arch drops below 0.6 bar, it will automatically replenish air.

5. The method for synchronous entry of a bucket wheel excavator into an air-supported membrane structure according to claim 1, characterized in that, In step S4, the connection points between the inner side of the air film and the inflatable arch are evenly distributed along the length of the arch, with a spacing of ≤3m, and wear-resistant pads are provided at the connection points.

6. The method for synchronous entry of a bucket wheel excavator into an air-supported membrane structure according to claim 1, characterized in that, In step S4, Velcro is installed every 3m along the length of the archway.

7. The method for synchronous entry of a bucket wheel excavator into an air-supported membrane structure according to claim 1, characterized in that, In step S5, if strong winds occur during inflation, inflation is suspended, and 2-3 galvanized steel wire ropes with a diameter of 12-16mm are strung at the top of the inflation arch as guy ropes. The guy ropes are kept away from the bucket wheel excavator's travel route and anchored to fixed points on the ground to form a triangular stability system.

8. The method for synchronous entry of a bucket wheel excavator into an air-supported membrane structure according to claim 1, characterized in that, In step S6, before the bucket wheel excavator enters the site, limit signs and anti-collision buffer devices are set on both sides of the passage to guide the bucket wheel excavator to pass in the center.

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