Double-machine combined hoisting construction method for gate in narrow space

Abstract

The invention provides a narrow space lower gate double-machine combined hoisting construction method which is suitable for gate hoisting operation in a limited operation space, a gate comprises a bottom section and a top section, an upper main wheel and a lower main wheel are arranged on the two sides of the gate of the bottom section, and a top main wheel is arranged on the two sides of the gate of the top section. Through double-machine combined hoisting of a folding arm type crane and an automobile type crane, the main wheels are matched with the locking beams to complete stress system conversion, double-section gate combined hoisting in a narrow space is achieved, the limitation of the operation space of gate hoisting can be effectively overcome, and the gate hoisting performance and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering construction, specifically to a method for the combined hoisting of gates in narrow spaces using two hoists. Background Technology

[0002] Gate structures are the most common form of hydraulic regulation in water conservancy projects. For gate structure construction, the construction of the structure is generally carried out first, including the construction of the gate bottom plate, gate pier, and gate slot. After the construction of the structure is completed, the gate is hoisted. The hoisting of the gate is limited by the working space conditions, especially the construction period requirements. If the hoisting machine room has been completed before the gate is hoisted, it will result in a limited working space for the gate hoisting, forming a narrow space that cannot be directly used for hoisting with hoisting machinery.

[0003] Truck cranes require a large operating space for hoisting operations. If the operating space is insufficient once the gate hoisting room is completed, the truck crane cannot directly complete the hoisting. Knuckle boom cranes use a rigid boom structure, and their lifting function relies solely on boom luffing. If the maintenance bridge is completed, it will intersect with the existing structure during gate hoisting. When the knuckle boom crane lowers the gate, it will cause spatial interference with the maintenance bridge structure, making operation impossible. Therefore, for gate hoisting in confined spaces, it is necessary to address the space constraints by combining cranes for efficient, rapid, and rational gate hoisting. Summary of the Invention

[0004] This invention addresses the problems of existing technologies by providing a gate hoisting method using a combination of two cranes in a confined space. By rationally combining the cranes, the performance of the cranes is maximized, enabling gate hoisting even in situations with limited working space.

[0005] This invention provides a method for constructing a gate using a dual-machine combination hoisting system in a narrow space. The gate is a flat gate, comprising a bottom section and a top section, which are welded together to form the flat gate. Upper and lower main wheels are installed on both sides of the gate on the bottom section, and top main wheels are installed on both sides of the gate on the top section. The construction method comprises the following steps: S1: Transport the bottom and top sections to the site, and position the folding boom crane and truck crane; S2: Use a folding boom crane to lift the bottom section, first move the bottom section to the top of the gate slot, and then use the folding boom crane to lower the bottom section along the gate slot until the lower main wheel of the bottom section enters the gate slot and the upper main wheel is above the top of the gate slot, then stop lowering the bottom section. S3: Place an I-beam locking beam at the top of the gate pier in the gate slot, so that the upper main wheel of the bottom section is above the I-beam locking beam. Start the folding boom crane to lower the bottom section, so that the upper main wheel of the bottom section is on the I-beam locking beam, and achieve temporary support and fixation. S4: The folding boom crane disconnects from the bottom section, the truck crane connects to the bottom section via the hook, the truck crane lifts the bottom section, the temporary support I-beam locking beam is removed, and the truck crane lowers the bottom section to the design position. S5: Repeat step S2 to hoist the top segment until the top main wheel of the top segment is a certain distance above the top of the gate slot, then stop lowering the top segment; S6: Repeat steps S3~S4 to hoist the top segment, use a truck crane to lower the top segment onto the bottom segment, and weld the top segment to the bottom segment outside the gate slot. S7: Use a truck crane to lift the fixed top and bottom sections until the connection point exceeds the top of the gate slot, weld the connection between the top and bottom sections in the gate slot, lower the flat gate to the design position after welding, and remove the connection between the truck crane and the top section.

[0006] Preferably, in S1, the folding boom crane is 92t and the truck crane is 50t. After the folding boom crane and the truck crane are in place, they are reinforced with support devices to ensure stable lifting.

[0007] Preferably, when the lowering of the bottom section is stopped in S2, the distance between the lowest end of the upper main wheel and the top plane of the gate slot is greater than the height of the I-beam locking beam; and when the lowering of the top section is stopped in S5, the distance between the lowest end of the top main wheel and the top plane of the gate slot is greater than the height of the I-beam locking beam.

[0008] Preferably, the I-beam locking beam is temporarily fixed to the top of the gate pier in the gate slot.

[0009] Preferably, in step S7, when the fixedly connected top and bottom sections are lifted by a truck crane until the connection point exceeds the top of the gate slot, an I-beam locking beam is placed at the top of the gate pier in the gate slot so that the upper main wheel in the bottom section is located on the I-beam locking beam. Then, the connection between the top and bottom sections in the gate slot is welded. After welding, the flat gate is lifted by a truck crane, the I-beam locking beam is removed, and the flat gate is placed at the designed position by a truck crane.

[0010] The working principle of this invention is as follows: For gate structures, to meet construction schedule requirements, it is generally necessary to construct the building first, and then hoist the gate after the building is completed. However, since the building is already completed, the working space is limited during gate hoisting, and conventional hoisting methods may not meet the requirements. This invention adopts a dual-machine combined hoisting method to overcome the problems of interference between the folding boom crane and the maintenance bridge during lowering and insufficient clear space for the truck crane during lifting. It proposes a combined hoisting method, utilizing the "articular" structure of the rigid boom of the folding boom crane for precise and rapid slotting, and using I-beams to construct temporary supports to ensure structural stability. Then, the hoisting system is converted, and the flexible characteristics of the truck crane are used to complete a second precise lowering. This fully leverages the advantages of the two machines at different stages of operation and jointly solves the hoisting problem under limited space conditions.

[0011] The segmented hoisting method reduces the pressure of each hoisting operation. Main wheels are installed on the bottom and top segments and fixed by welding. These main wheels serve as the load-bearing support points for the I-beam locking beam. The main wheels are used to complete the conversion of the load-bearing system, thereby realizing combined hoisting operations.

[0012] Utilizing a modular process of sectional hoisting and overall welding, after the bottom section is lowered to the designed position (usually the bottom sill), the force of the bottom section is transferred to the gate bottom plate, resulting in structural stability. The bottom section serves as the load-bearing support for the top section. Within the gate slot, its load-bearing support area is larger, which can meet the space, force, and welding precision requirements for welding operations. At this point, welding can be performed on the connection between the top and bottom sections. Since the parts of the top and bottom sections within the gate slot are concealed and cannot be effectively welded, a truck crane is used to lift the mostly welded flat gate above the top of the gate slot. The upper main wheels are locked using I-beams. Welding of the gate slot area is then performed on the top surface of the gate pier at the top of the gate slot. After welding is completed, the truck crane is used again to hoist and lower the flat gate. The truck crane is then dismantled, completing the hoisting construction.

[0013] When the construction period is tight, the locking of the I-beam locking beam can be omitted when welding the top and bottom sections of the gate slot. The flat gate can be lifted directly by a truck crane for welding, but the stability of the structure under stress must be ensured.

[0014] The advantages of this invention are: (1) The combination of "knuckle boom crane + truck crane" hoisting scheme is adopted to give full play to the flexibility of the knuckle boom crane and the large working range of the truck crane, optimize the gate hoisting operation space, and realize the combined hoisting of gates in complex and narrow environments; (2) The temporary support was replaced by the main wheels on both sides of the gate, the hoisting equipment was converted, and the step-by-step operation of "temporary support + secondary relay hoisting" was completed. By using load transfer and other operations, the safety of the hoisting process was effectively guaranteed and the hoisting construction risk was reduced. (3) The gate adopts a top section and a bottom section, which reduces the difficulty of hoisting the whole gate. The bottom section is hoisted to the design position first, and then the top section is hoisted to achieve precise splicing and welding. The whole gate is hoisted by a truck crane to complete the welding at the gate slot position, which improves the efficiency and accuracy of welding. Attached Figure Description

[0016] Figure 1 A schematic diagram showing the bottom section, top section, and main wheel of the gate; Figure 2 Schematic diagram of temporary support for the bottom segment locking beam; Figure 3 This is a process flow diagram of this construction method. Detailed Implementation

[0018] The following description, based on the accompanying drawings, provides a detailed explanation of the scope of this invention.

[0019] This invention provides a method for constructing a gate using a dual-machine combination hoisting system in a narrow space. The gate is a flat gate, comprising a bottom section 1 and a top section 2, which are welded together to form the flat gate. Upper main wheels 3 and lower main wheels 4 are provided on both sides of the gate in the bottom section 1, and top main wheels 5 are provided on both sides of the gate in the top section 2. The construction method comprises the following steps: S1: Transport bottom section 1 and top section 2 to the site, and position the folding boom crane and truck crane; S2: Use a folding boom crane to lift the bottom section 1, first move the bottom section 1 to the top of the gate slot, and then use the folding boom crane to lower the bottom section 1 along the gate slot until the lower main wheel 4 of the bottom section 1 enters the gate slot and the upper main wheel 3 is above the top of the gate slot, then stop lowering the bottom section 1. S3: Place an I-beam locking beam 7 at the top of the gate pier 6 of the gate slot, so that the upper main wheel 3 of the bottom section 1 is above the I-beam locking beam 7. Start the folding arm crane to lower the bottom section 1, so that the upper main wheel 3 of the bottom section 1 is on the I-beam locking beam 7, and achieve temporary support and fixation. S4: The folding boom crane disconnects from the bottom section 1, the truck crane connects to the bottom section 1 through the hook, the truck crane lifts the bottom section 1, the temporary support I-beam locking beam 7 is removed, and the truck crane lowers the bottom section 1 to the design position. S5: Repeat step S2 to hoist the top section 2 until the top main wheel 5 of the top section 2 is a certain distance above the top of the gate slot, then stop lowering the top section 2; S6: Repeat steps S3~S4 to hoist the top segment 2, and use a truck crane to lower the top segment 2 onto the bottom segment 1. The top segment 2 and the bottom segment 1 are fixedly connected outside the gate slot by welding. S7: Use a truck crane to lift the fixedly connected top section 2 and bottom section 1 until the connection point exceeds the top of the gate slot, weld the connection between the top section 2 and bottom section 1 in the gate slot, and after welding, lower the flat gate to the design position and remove the connection between the truck crane and the top section 2.

[0020] Preferably, in S1, the folding boom crane is 92t and the truck crane is 50t. After the folding boom crane and the truck crane are in place, they are reinforced with support devices to ensure stable lifting.

[0021] Preferably, when the lowering of the bottom section 1 is stopped in S2, the distance between the lowest end of the upper main wheel 3 and the top plane of the gate slot is greater than the height of the I-beam locking beam 7. When the lowering of the top section 2 is stopped in S5, the distance between the lowest end of the top main wheel 5 and the top plane of the gate slot is greater than the height of the I-beam locking beam 7.

[0022] The distance from the lowest end of the upper main wheel 3 or the top main wheel 5 to the top plane of the gate slot minus the height of the I-beam locking beam 7 shall not be less than 10cm. The web of the I-beam locking beam 7 is arranged along the direction of water flow. The upper main wheel 3, the lower main wheel 4 and the top main wheel 5 are all fixed by welding and are all located in the gate slot.

[0023] Preferably, the I-beam locking beam 7 is temporarily fixed to the top of the gate pier 6 of the gate slot.

[0024] Preferably, in step S7, when the top section 2 and bottom section 1, which are fixedly connected, are lifted by a truck crane until the connection point exceeds the top of the gate slot, an I-beam locking beam 7 is placed at the top of the gate pier 6 of the gate slot, so that the upper main wheel 3 in the bottom section 1 is located on the I-beam locking beam 7. Then, the connection between the top section 2 and the bottom section 1 in the gate slot is welded. After the welding is completed, the flat gate is lifted by a truck crane, the I-beam locking beam 7 is removed, and the flat gate is placed at the designed position by a truck crane.

[0025] In S7, the gate hoist can also be used to lift the top section 2 and bottom section 1, which have been mostly welded, for welding of the gate slot.

[0026] The steps in S5 and S6 are as follows: S5: Use a folding boom crane to lift the top section 2, first move the top section 2 directly above the gate slot, and then use the folding boom crane to lower the top section 2 along the gate slot until the top main wheel 5 of the top section 2 is a certain distance above the top of the gate slot, then stop lowering the top section 2. S6: Place an I-beam locking beam 7 at the top of the gate pier 6 in the gate slot, so that the top main wheel 5 of the top section 2 is above the I-beam locking beam 7. Start the folding boom crane to lower the top section 2, so that the top main wheel 5 of the top section 2 is on the I-beam locking beam 7 to achieve temporary support and fixation. Disconnect the folding boom crane from the top section 2. Connect the truck crane to the top section 2 through the hook. Use the truck crane to lift the top section 2, remove the temporary support I-beam locking beam 7, and use the truck crane to lower the top section 2 to the bottom section 1. Weld to achieve a fixed connection between the top section 2 and the bottom section 1 outside the gate slot.

[0027] Taking a certain project as an example, the main parameters of the working gate are as follows: the gate's net width is 6.5m and the net height is 7.6m; the effective net height from the top of the gate pier to the bottom of the beam of the hoist room is 10.25m; and the bottom section height of the gate is 4.3m.

[0028] The following safety parameters must be met for truck crane hoisting operations: a safe distance of 0.5m between the main boom and the gate hoist room, a minimum distance of 2.8m from the center of the hook to the end of the boom, a vertical distance of 0.8m from the center of the hook to the bottom of the hook, and an effective length of 2m for the hoisting rope. Calculations show that the minimum operating space required for a single hoisting operation is 4.3m + 0.5m + 2.8m + 0.8m + 2m = 10.4m. This value exceeds the 10.25m clearance height from the top of the gate pier to the bottom of the beam in the gate hoist room. Therefore, truck cranes cannot directly complete hoisting operations.

[0029] If a folding boom crane is used, its lifting function relies solely on boom luffing due to its rigid boom structure. Considering the actual site conditions, the maintenance bridge construction is already complete. During lifting and lowering operations, the crane boom will spatially interfere with the maintenance bridge structure, posing significant operational limitations.

[0030] Considering the on-site operating conditions, a 92t folding boom crane and a 50t truck crane were selected for combined hoisting in narrow spaces. After applying this technology on-site, the hoisting and installation of segmented gates was successfully completed.

[0031] The above embodiments are merely preferred embodiments of the present invention. The scope of protection of the present invention should not be considered as limited to the specific forms described in the embodiments. The scope of protection of the present invention also includes equivalent technical means that can be conceived by those skilled in the art based on the concept of the present invention.

Claims

1. A method for constructing a gate in a narrow space using a dual-machine combination hoisting system, wherein the gate is a flat gate, comprising a bottom section and a top section, the bottom section and the top section being welded together to form the flat gate, the bottom section having upper and lower main wheels on both sides, and the top section having top main wheels on both sides, characterized in that: The construction method includes the following steps: S1: Transport the bottom and top sections to the site, and position the folding boom crane and truck crane; S2: Use a folding boom crane to lift the bottom section, first move the bottom section to the top of the gate slot, and then use the folding boom crane to lower the bottom section along the gate slot until the lower main wheel of the bottom section enters the gate slot and the upper main wheel is above the top of the gate slot, then stop lowering the bottom section. S3: Place an I-beam locking beam at the top of the gate pier in the gate slot, so that the upper main wheel of the bottom section is above the I-beam locking beam. Start the folding boom crane to lower the bottom section, so that the upper main wheel of the bottom section is on the I-beam locking beam, and achieve temporary support and fixation. S4: The folding boom crane disconnects from the bottom section, the truck crane connects to the bottom section via the hook, the truck crane lifts the bottom section, the temporary support I-beam locking beam is removed, and the truck crane lowers the bottom section to the design position. S5: Repeat step S2 to hoist the top segment until the top main wheel of the top segment is a certain distance above the top of the gate slot, then stop lowering the top segment; S6: Repeat steps S3~S4 to hoist the top segment, use a truck crane to lower the top segment onto the bottom segment, and weld the top segment to the bottom segment outside the gate slot. S7: Use a truck crane to lift the fixed top and bottom sections until the connection point exceeds the top of the gate slot, weld the connection between the top and bottom sections in the gate slot, lower the flat gate to the design position after welding, and remove the connection between the truck crane and the top section.

2. The method for constructing a gate in a narrow space using a dual-machine combination hoisting system as described in claim 1, characterized in that: In S1, the folding boom crane has a capacity of 92t and the truck crane has a capacity of 50t. After the folding boom crane and the truck crane are in place, they are reinforced with support devices to ensure stable lifting.

3. The method for constructing a gate in a narrow space using a dual-machine combination hoisting system as described in claim 1, characterized in that: When the lowering of the bottom section is stopped in S2, the distance between the lowest end of the upper main wheel and the top plane of the gate slot is greater than the height of the I-beam locking beam. When the lowering of the top section is stopped in S5, the distance between the lowest end of the top main wheel and the top plane of the gate slot is greater than the height of the I-beam locking beam.

4. The method for constructing a gate in a narrow space using a dual-machine combination hoisting system as described in claim 1, characterized in that: The I-beam locking beam is temporarily fixed to the top of the gate pier in the gate slot.

5. The method for constructing a gate in a narrow space using a dual-machine combination hoisting system as described in claim 1, characterized in that: In step S7, when the top and bottom segments of the fixed connection are lifted by a truck crane until the connection exceeds the top of the gate slot, an I-beam locking beam is placed at the top of the gate pier of the gate slot so that the upper main wheel in the bottom segment is located on the I-beam locking beam. Then, the connection between the top and bottom segments in the gate slot is welded. After the welding is completed, the flat gate is lifted by a truck crane, the I-beam locking beam is removed, and the flat gate is placed at the designed position by a truck crane.

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