Underground diaphragm wall reinforcement cage hoisting process

Abstract

The invention discloses an underground diaphragm wall reinforcement cage hoisting process which comprises the following steps: S01, commanding a main crane and an auxiliary crane to transfer to a hoisting position, and respectively installing shackles of hoisting points by a hoisting worker; according to the method, the position of the hoisting point is determined firstly, and before hoisting, the node reinforcement at the hoisting point, the U-steel diagonal bracing reinforcement of the L-shaped reinforcement cage, the temporary shelving point, the fixed shelving point, the iron carrying pole and the material cable need to be checked, so that the requirements are met, and the hoisting risk is reduced; when a reinforcement cage is hoisted, a main machine and an auxiliary machine should be synchronous and listen to hoisting commands, the reinforcement cage is hoisted into a groove by the main machine after returning to be straight in the air, channel steel needs to be temporarily placed and firmly fixed when a steel wire rope is lengthened or replaced, and construction safety is ensured; the reinforcement cage is aligned with the center of the groove width when entering the groove, and is vertically and accurately inserted into the groove. The lowering process needs to be constant and slow, and the situation that the reinforcement cage swings transversely due to swing of a crane or other influences, and the groove wall collapses is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of steel cage hoisting, and in particular to a steel cage hoisting process for an underground continuous wall. Background Art

[0002] Wenzheng Street Station is located at the intersection of Xinghe South Road and Wenzheng Street. It is a transfer station for Hangzhou-Haikou Line and Line 18, and the transfer form is "L" type transfer. Wenzheng Street Station of Line 18 is arranged along Xinghe South Road in the north-south direction. It is a two-story underground island platform with a double-column three-span (partial single-column two-span) box-type frame structure. It is constructed by open-cut and continuous construction. The local traffic relief part is covered and continuous construction, and the auxiliary part is constructed by open-cut and continuous construction (partially covered and continuous construction is used for auxiliary parts). Wenzheng Street Station is 394.618m long, the platform is 13m wide, the standard section of the foundation pit is 22.1m wide and 17.7m deep, the small mileage end is 21.9m deep, and the large mileage end is 19.1m deep. The foundation pit depth of the transfer node is about 27.11m. The deep foundation pit of Wenzheng Street Station adopts the enclosure scheme of underground continuous wall + internal support. The thickness of the underground continuous wall is 800mm, 1000mm and 1200mm respectively. Among them, 800mm and 1000mm thick walls use H-shaped steel joints, and 1200mm thick walls use cross steel plate joints. The small mileage end of Wenzheng Street Station is a single shield receiver, and the large mileage end is a double shield receiver. The underground continuous wall in the receiving shield crossing area uses glass fiber reinforcement and rubber waterstop joints; the underground continuous wall steel cage is heavy, large in size, and easy to deform. When hoisting, the hoisting equipment must not only consider the lifting capacity, operating radius and site influence, but also the stability during operation and the control of steel bar deformation. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a lifting process for an underground continuous wall reinforcement cage.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A process for hoisting a steel cage of an underground continuous wall, the hoisting process comprising the following steps: S01: Command the main and auxiliary cranes to move to the lifting position. The riggers install the shackles of the lifting points respectively. The lifting point positions are determined according to the reinforcement drawing of the steel cage. The main lifting of the steel cage is set with 3 12-point lifting points, and the auxiliary lifting is set with 2 8-point lifting points; S02: After checking the installation and force center of the wire ropes of the two cranes, start to hoist them horizontally at the same time until they are 0.3m off the ground, then command personnel to check the welding conditions of each lifting point on the steel cage and the tension of the wire rope. When the steel cage is stable, let it stand for 3-5 minutes, then hoist them horizontally at the same time until they are 0.5m off the ground, then command personnel to check whether the steel cage is welded to the production frame, whether there are steel bar heads on the lower surface of the steel cage, and the welding conditions of the additional bars. After the inspection is completed, the hoisting can be carried out only after confirming safety; S03: The steel cage is lifted by two cranes. The main crane stands to the north and the auxiliary crane stands to the south. The two cranes point their booms toward the steel cage to be lifted. During the lifting process, a full-time commander directs the two cranes to lift synchronously, and the main crane is hooked. According to the distance between the rear of the steel cage and the ground, the auxiliary crane is directed to cooperate in lifting the hook. During the lifting, the position of the main crane remains unchanged, the main and auxiliary cranes rotate their booms toward each other, and the auxiliary crane moves toward the main crane. Until the steel cage is lifted vertically, the crane operator is directed to remove the lifting pole of the auxiliary crane on the steel cage, and then move away from the lifting operation range. S04: Rotate the main crane angle, control the boom angle, lift the steel cage to the slot, and lower it into the slot after alignment. When the steel cage enters the slot to the cage tail lifting point, remove the auxiliary lifting wire rope; When the steel cage is lowered to the third main lifting point, use two laying poles to lay the steel cage on the guide wall and then remove the shackle on the auxiliary rope, connect it with the second guide rope, straighten the wire rope, lift the steel cage 50cm, and then pull out the laying poles; Lower the steel cage to the second lifting point, use the laying pole to lay the steel cage again, and remove the auxiliary rope and the second guide rope; Then connect the main rope with the first guide rope in series, straighten the wire rope, pull out the steel cage, and place the pole 50cm. When the steel cage is lowered to the cage head lifting point, place two poles under the lifting lugs, and place the steel cage on the guide wall with the poles. After the steel cage is balanced, command the crane to release the wire rope, and assist personnel to quickly untie the wire rope at the main lifting ring, and connect it with the top lifting ring steel bar through the shackle. After the connection is completed, the crane will lift the steel cage again and lower it to the designed elevation; S05: After confirming that the elevation is correct, remove the lifting equipment.

[0005] Preferably, the maximum force of the auxiliary crane is lower than the sum of 60% of the weight of the steel cage and the weight of the auxiliary hoisting sling.

[0006] Preferably, the rotation radius and angle of the main crane are controlled within 0-60°.

[0007] Preferably, longitudinal and transverse truss bars are arranged on the steel cage, with one transverse truss bar being arranged every 5m in the depth direction of the underground continuous wall, and four vertical truss bars being arranged.

[0008] Preferably, in addition to setting up longitudinal and transverse lifting trusses and lifting points, the corner steel cage should also be reinforced with "H" trusses and diagonal rods, with the same spacing as the horizontal trusses.

[0009] Preferably, before lifting the steel cage, debris such as short steel bars and welding rods on and inside the steel cage need to be cleaned.

[0010] Preferably, a φ40 tie rod is provided at each hanging point, and single-sided welding is adopted for welding.

[0011] Preferably, when welding the special-shaped steel cage, additional 28-diameter rebar is added on the inside of the corner, with a spacing of 1.5 meters for diagonal braces. During the hoisting of the steel cage, the auxiliary crane adopts two-point cross hoisting. The main reinforcement and distribution reinforcement at the corner are all welded, and additional transverse and longitudinal truss reinforcement are added.

[0012] Preferably, after the second section of the steel cage is lifted vertically, it is turned to the slot position and temporarily placed on the slot with a shoulder pole. The bottom of the shoulder pole is supported by a steel plate and connected to the first section of the steel cage. After the connection is completed, the distribution reinforcement on both sides is welded and the steel cage is lowered. The steel cage is placed at the slot mouth and kept horizontal.

[0013] Preferably, the sonic detection tube and the sonar detection tube can be directly fixed on the inner side of the steel cage, and the spacing between the fixing points shall not exceed 2 meters. The bottom ends and joints of the sonic detection tube and the sonar tube must be provided with fixing points. For the parts without steel cage, the sonic detection tube and the sonar tube can be fixed with steel brackets. The steel cage cannot be twisted when it is placed in. The acoustic detection pipe should be installed in sections with the steel cage. Clean water should be added to the pipe after each buried section. After the pipe is installed, it should be blocked at the top and sealed at the bottom to prevent foreign objects from falling into the concrete and blocking the channel.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention first determines the position of the lifting point, and before lifting, it is necessary to check the node reinforcement at the lifting point, the L-shaped steel cage channel steel diagonal brace reinforcement, the temporary shelving point, the fixed shelving point, and the iron shoulder pole and material rope to ensure that they meet the requirements and reduce the risk of lifting; when the steel cage is lifted, the main machine and the auxiliary machine should be synchronized and obey the lifting command. After the steel cage is straightened in the air, the main machine is responsible for lifting it into the slot. When the steel wire rope is extended or replaced, the temporary shelving channel steel must be fixed firmly to ensure construction safety; when the steel cage is put into the slot, it must be aligned with the center of the slot width and inserted vertically and accurately into the slot. The lowering process needs to be uniform and slow, and avoid lateral swing of the steel cage due to crane swing or other influences, causing the slot wall to collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more specifically and intuitively illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the posture structure of the double-machine lifting crane for the steel cage proposed by the present invention; Figure 2 This is a schematic diagram of the posture structure of the aerial rotating crane proposed by the present invention; Figure 3 This is a schematic diagram of the structural posture of the steel cage slotting stable crane proposed by the present invention; Figure 4 This is a schematic diagram of the posture structure of the crane for splicing the steel cage into the groove proposed by the present invention. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Reference Figure 1-4 , a lifting process for underground continuous wall steel cage, the lifting process comprises the following steps: S01: Command the main and auxiliary cranes to move to the lifting position. The riggers install the shackles of the lifting points respectively. The lifting point positions are determined according to the reinforcement drawing of the steel cage. The main lifting of the steel cage is set with 3 12-point lifting points, and the auxiliary lifting is set with 2 8-point lifting points; S02: After checking the installation and force center of the wire ropes of the two cranes, start to hoist them horizontally at the same time until they are 0.3m off the ground, then command personnel to check the welding conditions of each lifting point on the steel cage and the tension of the wire rope. When the steel cage is stable, let it stand for 3-5 minutes, then hoist them horizontally at the same time until they are 0.5m off the ground, then command personnel to check whether the steel cage is welded to the production frame, whether there are steel bar heads on the lower surface of the steel cage, and the welding conditions of the additional bars. After the inspection is completed, the hoisting can be carried out only after confirming safety; S03: The steel cage is lifted by two cranes. The main crane stands to the north and the auxiliary crane stands to the south. The two cranes point their booms toward the steel cage to be lifted. During the lifting process, a full-time commander directs the two cranes to lift synchronously, and the main crane is hooked. According to the distance between the rear of the steel cage and the ground, the auxiliary crane is directed to cooperate in lifting the hook. During the lifting, the position of the main crane remains unchanged, the main and auxiliary cranes rotate their booms toward each other, and the auxiliary crane moves toward the main crane. Until the steel cage is lifted vertically, the crane operator is directed to remove the lifting pole of the auxiliary crane on the steel cage, and then move away from the lifting operation range. S04: Rotate the main crane angle, control the boom angle, lift the steel cage to the slot, and lower it into the slot after alignment. When the steel cage enters the slot to the cage tail lifting point, remove the auxiliary lifting wire rope; When the steel cage is lowered to the third main lifting point, use two laying poles to lay the steel cage on the guide wall and then remove the shackle on the auxiliary rope, connect it with the second guide rope, straighten the wire rope, lift the steel cage 50cm, and then pull out the laying poles; Lower the steel cage to the second lifting point, use the laying pole to lay the steel cage again, and remove the auxiliary rope and the second guide rope; Then connect the main rope with the first guide rope in series, straighten the wire rope, pull out the steel cage, and place the pole 50cm. When the steel cage is lowered to the cage head lifting point, place two poles under the lifting lugs, and place the steel cage on the guide wall with the poles. After the steel cage is balanced, command the crane to release the wire rope, and assist personnel to quickly untie the wire rope at the main lifting ring, and connect it with the top lifting ring steel bar through the shackle. After the connection is completed, the crane will lift the steel cage again and lower it to the designed elevation; S05: After confirming that the elevation is correct, remove the lifting equipment.

[0019] In this embodiment, the maximum force of the auxiliary crane is lower than the sum of 60% of the weight of the steel cage and the weight of the auxiliary hoist sling.

[0020] In this implementation, the rotation radius and angle of the main crane are controlled within 0-60°.

[0021] In this implementation scheme, longitudinal and transverse truss bars are set on the steel cage. One transverse truss bar is set every 5m along the depth direction of the underground continuous wall, and four vertical truss bars are set to ensure that the steel cage will not be deformed or twisted during the lifting process.

[0022] In this implementation scheme, in addition to setting up longitudinal and transverse lifting trusses and lifting points for the corner steel cage, "A-shaped" trusses and diagonal rods are also added for reinforcement, with the same spacing as the horizontal trusses, to prevent the steel cage from deforming when it is flipped in the air.

[0023] In this implementation scheme, before the steel cage is lifted, debris such as short steel bars and welding rods on and inside the steel cage need to be cleaned up.

[0024] In this embodiment, φ40 tie bars are set at each lifting point, and single-sided welding is adopted. Its function is to distribute the lifting force to the lower steel mesh during horizontal lifting to prevent deformation caused by large local forces.

[0025] In this implementation scheme, when welding the special-shaped steel cage, 28-diameter rebar is added on the inside of the corner, with a spacing of 1.5 meters for diagonal braces. During the hoisting of the steel cage, the auxiliary crane adopts two-point cross lifting. The main reinforcement and distribution reinforcement at the corner are all welded, and additional transverse and longitudinal truss reinforcement are added.

[0026] In this implementation scheme, after the second section of the steel cage is lifted vertically, it is turned to the slot position and temporarily placed on the slot with a shoulder pole. The bottom of the shoulder pole is supported by a steel plate and connected to the first section of the steel cage. After the connection is completed, the distribution reinforcement on both sides is welded and the steel cage is lowered. The steel cage is placed at the slot mouth and kept horizontal.

[0027] In this embodiment, the sonic detection tube and the sonar detection tube can be directly fixed on the inner side of the steel cage, and the spacing between the fixing points shall not exceed 2 meters. The bottom ends and joints of the sonic detection tube and the sonar tube must be provided with fixing points. For the parts without steel cage, the sonic detection tube and the sonar tube can be fixed with steel brackets. The steel cage cannot be twisted when it is placed in. The acoustic detection pipe should be installed in sections with the steel cage. Clean water should be added to the pipe after each buried section. After the pipe is installed, it should be blocked at the top and sealed at the bottom to prevent foreign objects from falling into the concrete and blocking the channel.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A process for hoisting a steel cage of an underground continuous wall, characterized in that: The lifting process includes the following steps: S01: Command the main and auxiliary cranes to move to the lifting position. The riggers install the shackles of the lifting points respectively. The lifting point positions are determined according to the reinforcement drawing of the steel cage. The main lifting of the steel cage is set with 3 12-point lifting points, and the auxiliary lifting is set with 2 8-point lifting points; S02: After checking the installation and force center of the wire ropes of the two cranes, start to hoist them horizontally at the same time until they are 0.3m off the ground, then command personnel to check the welding conditions of each lifting point on the steel cage and the tension of the wire rope. When the steel cage is stable, let it stand for 3-5 minutes, then hoist them horizontally at the same time until they are 0.5m off the ground, then command personnel to check whether the steel cage is welded to the production frame, whether there are steel bar heads on the lower surface of the steel cage, and the welding conditions of the additional bars. After the inspection is completed, the hoisting can be carried out only after confirming safety; S03: The steel cage is lifted by two cranes. The main crane stands to the north and the auxiliary crane stands to the south. The two cranes point their booms toward the steel cage to be lifted. During the lifting process, a full-time commander directs the two cranes to lift synchronously, and the main crane is hooked. According to the distance between the rear of the steel cage and the ground, the auxiliary crane is directed to cooperate in lifting the hook. During the lifting, the position of the main crane remains unchanged, the main and auxiliary cranes rotate their booms toward each other, and the auxiliary crane moves toward the main crane. Until the steel cage is lifted vertically, the crane operator is directed to remove the lifting pole of the auxiliary crane on the steel cage, and then move away from the lifting operation range. S04: Rotate the main crane angle, control the boom angle, lift the steel cage to the slot, and lower it into the slot after alignment. When the steel cage enters the slot to the cage tail lifting point, remove the auxiliary lifting wire rope; When the steel cage is lowered to the third main lifting point, use two laying poles to lay the steel cage on the guide wall and then remove the shackle on the auxiliary rope, connect it with the second guide rope, straighten the wire rope, lift the steel cage 50cm, and then pull out the laying poles; Lower the steel cage to the second lifting point, use the laying pole to lay the steel cage again, and remove the auxiliary rope and the second guide rope; Then connect the main rope with the first guide rope in series, straighten the wire rope, pull out the steel cage, and place the pole 50cm. When the steel cage is lowered to the cage head lifting point, place two poles under the lifting lugs, and place the steel cage on the guide wall with the poles. After the steel cage is balanced, command the crane to release the wire rope, and assist personnel to quickly untie the wire rope at the main lifting ring, and connect it with the top lifting ring steel bar through the shackle. After the connection is completed, the crane will lift the steel cage again and lower it to the designed elevation; S05: After confirming that the elevation is correct, remove the sling.

2. The underground continuous wall reinforcement cage hoisting process according to claim 1 is characterized in that: The maximum force of the auxiliary crane is lower than the sum of 60% of the weight of the steel cage and the weight of the auxiliary hoisting sling.

3. The underground continuous wall reinforcement cage hoisting process according to claim 2 is characterized in that: The rotation radius and angle of the main crane are controlled within 0-60°.

4. The underground continuous wall reinforcement cage hoisting process according to claim 3 is characterized in that: Longitudinal and transverse truss bars are set on the steel cage. The transverse truss bars are set every 5m along the depth direction of the underground continuous wall, and 4 vertical truss bars are set.

5. The underground continuous wall reinforcement cage hoisting process according to claim 4 is characterized in that: In addition to setting up longitudinal and transverse lifting trusses and lifting points for the corner steel cage, "A" trusses and diagonal rods should be added for reinforcement, with the same spacing as the horizontal trusses.

6. The underground continuous wall reinforcement cage hoisting process according to claim 5 is characterized in that: Before lifting the steel cage, debris such as short steel bars and welding rods on and inside the steel cage must be cleaned up.

7. The underground continuous wall reinforcement cage hoisting process according to claim 6 is characterized in that: φ40 tie rods are set at each hanging point, and single-sided welding is adopted.

8. The underground continuous wall reinforcement cage hoisting process according to claim 7 is characterized in that: When welding the special-shaped steel cage, add 28-diameter rebar on the inside of the corner, and use diagonal braces with a spacing of 1.5 meters. During the lifting of the steel cage, the auxiliary crane adopts two-point cross lifting. The main reinforcement and distribution reinforcement at the corner are all welded, and additional transverse and longitudinal truss reinforcement are added.

9. The underground continuous wall reinforcement cage hoisting process according to claim 8 is characterized in that: After the second section of the steel cage is lifted vertically, it is turned to the slot position and temporarily placed on the slot with a shoulder pole. The bottom of the shoulder pole is supported by a steel plate and connected to the first section of the steel cage. After the connection is completed, the distribution reinforcement on both sides is welded and the steel cage is lowered. The steel cage is placed at the slot mouth and kept horizontal.

10. The underground continuous wall reinforcement cage hoisting process according to claim 9 is characterized in that: The sonic detection tube and sonar detection tube can be directly fixed on the inner side of the steel cage, and the spacing between the fixing points shall not exceed 2 meters. The bottom and joints of the sonic detection tube and sonar tube must be fixed with fixing points. For areas without steel cages, the sonic detection tube and sonar tube can be fixed with steel brackets. The steel cage cannot be twisted when it is placed in. The acoustic detection pipe should be installed in sections with the steel cage. Clean water should be added to the pipe after each buried section. After the pipe is installed, it should be blocked at the top and sealed at the bottom to prevent foreign objects from falling into the concrete and blocking the channel.

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