High-efficiency Demolition System and Construction Method for Steel-Concrete Composite Internal Support in Deep Foundation Pit

Abstract

The present invention relates to an efficient demolition system and construction method for a steel-concrete composite internal support in a deep foundation pit. Through two-dimensional code information encoding, construction personnel can understand the demolition sequence and process of each component to be demolished through the two-dimensional code, ensuring the orderly progress of the demolition process and improving the demolition efficiency. The three-dimensional laser scanning measuring instrument can directly measure the components to be demolished through laser scanning technology, and can directly transmit the data into the computer system to calculate the demolition and temporary support points of each component to be demolished, significantly improving the measurement efficiency and accuracy, while reducing the labor cost. At the same time, the concrete internal support system, the demolition safety operation platform and the steel column support system directly support the support and columns to be demolished. Compared with the traditional method of building temporary supports for support, the device has higher construction efficiency, lower labor cost, and the support device can be reused.

Description

Technical Field

[0001] The invention belongs to the technical field of the disassembly of steel-concrete composite internal supports for deep foundation pits, and particularly relates to an efficient demolition system and construction method for steel-concrete composite internal supports of deep foundation pits. Background Technique

[0002] With the development and utilization of urban underground space, there are more and more construction projects of underground civil air defense projects, underground garages, and urban infrastructure. During the construction of foundation pits for underground projects, it is necessary to protect the surrounding buildings and municipal facilities to ensure the normal and safe use of buildings and municipal facilities. Therefore, proper and effective support measures need to be adopted. The steel-concrete composite internal support has large stiffness, small deformation, and convenient construction, and is a commonly used support structure form for deep foundation pits of underground projects in coastal soft soil areas. The reinforced concrete internal support of the deep foundation pit is a temporary construction measure for the construction of the main structure of the underground project, and needs to be removed in time with the construction of the main structure of the underground project for necessary "support replacement" to ensure the smooth construction of the main structure of the underground project. Engineering shows that the maximum deformation value of most deep foundation pit support structures does not occur in the excavation stage, but in the support removal stage. Previous studies only considered the deformation generated in the foundation pit excavation stage, ignoring the impact of support removal on the foundation pit deformation, which leads to greater potential safety hazards in the engineering construction.

[0003] At present, the commonly used foundation pit support removal technologies mainly include two methods: blasting removal and hydraulic hammer removal. Among them, blasting removal has hazards such as flying stones, shock waves, and vibrations, which are likely to have a greater impact on the main project and the surrounding environment. It is necessary to set up a safety protection frame, and the cost of human and material resources is high. At the same time, this technology has high professionalism and requires approval from relevant departments, and the approval procedures are cumbersome. The hydraulic hammer removal technology has a long construction period, is prone to generate continuous noise during the construction process, and has a great impact on the surrounding residential areas. At the same time, the mechanical power is large, the vibration is strong, and the mechanical crushing block size is large, which will affect the reserved steel bars on the floor slab.

[0004] Therefore, in order to solve the common problems in the disassembly process of steel-concrete composite internal supports for deep foundation pits, aiming at the engineering status quo of multiple problems, complex processes, high construction costs, and long time consumption, there is an urgent need for an efficient demolition technology for steel-concrete composite internal supports of deep foundation pits that is fast, simple, safe, effective, fully functional, and low-cost. Summary of the Invention

[0005] The purpose of the invention is to overcome the deficiencies in the prior art and provide an efficient demolition system and construction method for steel-concrete composite internal supports of deep foundation pits.

[0006] Such an efficient demolition system for steel-concrete composite internal supports of deep foundation pits includes: a concrete internal support support system, a disassembly safety operation platform, a concrete cutting system, a steel column support system, a component hoisting system, and a disassembly system moving device; the disassembly system moving device includes wheels and movable feet;

[0007] The concrete internal support system includes a concrete internal support bracket gripper and a first telescopic bracket; the concrete internal support bracket gripper is fixedly connected to the concrete internal support; the first telescopic bracket is connected to the concrete internal support bracket gripper, and the bottom of the first telescopic bracket is slidably connected to the first sliding track;

[0008] The concrete cutting system includes a second sliding track and a diamond chain saw; the diamond chain saw is slidably connected to the second sliding track through a telescopic rod; the disassembly safety operation platform includes a hydraulic jack and a lifting platform; a second telescopic bracket is provided at the bottom of the lifting platform; the hydraulic jack is fixed on the lifting platform, and the hydraulic jack contacts the bottom surface of the steel support;

[0009] The steel column support system includes a steel column support bracket gripper, a third telescopic bracket, a third sliding track, and a steel column support bracket vertical rod; the steel column support bracket gripper is fixed to the third telescopic bracket, and the steel column support bracket gripper is fixedly connected to the steel column; the third telescopic bracket is slidably connected to the third sliding track through the steel column support bracket vertical rod.

[0010] Preferably: The component hoisting system includes a fourth sliding track, a hoisting base, a rotating base, a telescopic arm, a hoisting gripper, a fourth telescopic bracket, and an anti-falling fixing device; the hoisting base is slidably connected to the fourth sliding track; the telescopic arm is fixed to the rotating base through the fourth telescopic bracket; the hoisting gripper is fixed to the fourth telescopic bracket through the telescopic arm; the anti-falling fixing device is provided below the hoisting gripper.

[0011] Preferably: The disassembly system moving device is provided below the main body of the disassembly system platform, and the movable feet include a first movable foot, a second movable foot, and a third movable foot; the disassembly system moving device further includes a fifth sliding track and an anti-tipping counterweight; the movable feet are provided on the lower surface of the main body of the disassembly system platform through the fifth sliding track; the anti-tipping counterweight is placed at the tail edge of the main body of the disassembly system platform.

[0012] Preferably: It further includes a laser measurement device, and the laser measurement device includes a three-dimensional laser scanning measuring instrument and a vertical rod; the three-dimensional laser scanning measuring instrument is installed on the main body of the disassembly system platform through the vertical rod, and the three-dimensional laser scanning measuring instrument is connected to the computer system in the safety operation room.

[0013] Preferably: Two-dimensional code information coding is provided on the concrete internal support, the steel support system, and the steel column.

[0014] The construction method of this high-efficiency demolition system for the steel-concrete combined internal support of deep foundation pits includes the following steps:

[0015] Step 1: Arrange the QR code information encoding at each component to be disassembled according to the construction sequence; enter the relevant data into the computer system in the safety operation room;

[0016] Step 2: Use the disassembly system mobile device to move the steel-concrete composite internal support disassembly system into the foundation pit to be constructed;

[0017] Step 3: Demolition and hoisting of the concrete internal support: Use a three-dimensional laser scanning measuring instrument to determine the cutting points; temporarily support the concrete internal support through the concrete internal support support system; cut the concrete internal support using the concrete cutting system, and hoist it to the temporary shelving platform through the component hoisting system;

[0018] Step 4: Demolition and hoisting of the steel support: Measure the steel support and determine the cutting points; use a hydraulic jack to temporarily support the steel support and gradually relieve the pressure; disassemble the steel support on the disassembly safety operation platform; and hoist it to the temporary shelving platform using the component hoisting system;

[0019] Step 5: Demolition and hoisting of the steel column: Measure the steel column to be disassembled; determine the cutting points, operate the steel column support system, and achieve temporary support for the steel column; after the disassembly safety operation platform rises to the designated height, cut the bracket, and hoist it to the temporary shelving platform using the component hoisting system; on the disassembly safety operation platform, cut the steel column layer by layer according to the order from top to bottom, and hoist it to the temporary shelving platform using the component hoisting system;

[0020] Step 6: The steel-concrete composite internal support disassembly system leaves the foundation pit.

[0021] Preferably, in Step 2: After one-third of the length of the platform main body of the disassembly system enters the foundation pit through the wheels, unfold the third movable support foot. After the support foot is stable, the platform main body of the disassembly system continues to move into the foundation pit, and the third movable support foot remains fixed relative to the foundation pit; after two-thirds of the length of the platform main body of the disassembly system enters the foundation pit, continue to unfold the second movable support foot. After the support foot is stable, the platform main body of the disassembly system continues to move into the foundation pit, and the second movable support foot also remains fixed relative to the foundation pit. After the platform main body of the disassembly system completely enters the foundation pit, unfold the first movable support foot; finally, simultaneously contract the third movable support foot, the second movable support foot, and the first movable support foot to lower the platform main body of the disassembly system until the bottom of the wheel contacts the bottom surface of the foundation pit.

[0022] Preferably, in Steps 3 to 5, before hoisting the component, move the anti-falling fixing device to a suitable position, and the component can also be further fixed to the hoisting gripper using a rope or steel cable.

[0023] Preferably, in step four: the hydraulic jack unloads the steel support step by step in three levels according to 80%, 50%, and 0% of the pre-applied axial force.

[0024] Preferably, in step six: the method for the steel-concrete composite internal support disassembly system to leave the foundation pit is opposite to the method in step two for using the disassembly system moving device to make the steel-concrete composite internal support disassembly system enter the foundation pit to be constructed. Specifically, simultaneously extend the third movable support foot, the second movable support foot, and the first movable support foot to raise the main body of the disassembly system platform; then move the main body of the disassembly system platform out of the foundation pit, and simultaneously retract the first movable support foot, the second movable support foot, and the third movable support foot in batches according to the length of the main body of the disassembly system platform leaving the foundation pit, so that the steel-concrete composite internal support disassembly system leaves the foundation pit.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1) The present invention adopts two-dimensional code information coding. Construction workers can understand the disassembly sequence and process of each component to be disassembled through the two-dimensional code, avoiding disorder in the disassembly sequence, ensuring the orderly progress of the disassembly process, and improving the disassembly efficiency.

[0027] 2) The three-dimensional laser scanning measuring instrument adopted by the present invention can directly measure the components to be disassembled through laser scanning technology, and can directly transmit the data into the computer system to calculate the disassembly and temporary support points of each component to be disassembled. Compared with the traditional on-site manual measurement and setting out, it significantly improves the measurement efficiency and accuracy, and at the same time reduces the labor cost.

[0028] 3) The present invention adopts a concrete internal support support system, a disassembly safety operation platform, and a steel section column support system to directly support the support and column to be disassembled. Compared with the traditional method of building a temporary support, the device adopted by the present invention has higher construction efficiency, lower labor cost, and the support device can be reused, reducing the link of removing the temporary support, and significantly improving the project efficiency.

[0029] 4) The present invention associates the support system, disassembly system, and component hoisting system of each component to be disassembled with the computer system, and can directly realize the operation of each system through computer commands, realizing automated construction, significantly reducing the number of personnel during the disassembly of the foundation pit support, and improving the project construction efficiency.

[0030] 5) The hydraulic jack is adopted in the disassembly safety operation platform of the present invention to realize the step-by-step pressure relief of the steel support, which can avoid excessive local deformation and cracking of the structure caused by the instantaneous release of the pre-applied stress, reduce the influence of the removal of the steel support on the deformation of the foundation pit, and reduce the safety risk.

[0031] 6) The component hoisting system adopted by the present invention can directly hoist the disassembled components onto the platform enclosed by the guardrails of the shelving platform, avoiding the components from slipping off the main body of the disassembly system platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is the construction flow chart of the high-efficiency demolition system for the steel-concrete composite internal support in deep foundation pits;

[0033] Figure 2 is the top view of the concrete internal support disassembly;

[0034] Figure 3 is the side view of the concrete internal support disassembly;

[0035] Figure 4 is the front view of the concrete internal support disassembly;

[0036] Figure 5 is the top view of the section steel support disassembly;

[0037] Figure 6 is the side view of the section steel support disassembly;

[0038] Figure 7 is the front view of the section steel support disassembly;

[0039] Figure 8 is the top view of the section steel column disassembly;

[0040] Figure 9 is the side view of the section steel column disassembly;

[0041] Figure 10 is the front view of the section steel column disassembly;

[0042] Figure 11 is the schematic diagram of the moving device of the disassembly system;

[0043] Figure 12 is the schematic diagram of one-third of the high-efficiency demolition system for the steel-concrete composite internal support in deep foundation pits entering the foundation pit;

[0044] Figure 13 is the schematic diagram of two-thirds of the high-efficiency demolition system for the steel-concrete composite internal support in deep foundation pits entering the foundation pit;

[0045] Figure 14 is the schematic diagram of the high-efficiency demolition system for the steel-concrete composite internal support in deep foundation pits completely entering the foundation pit.

[0046] Among them: two-dimensional code information encoding 1, concrete internal support system 2, concrete internal support bracket gripper 2-1, first telescopic bracket 2-2, first sliding track 2-3, concrete internal support 3, disassembly safety operation platform 4, hydraulic jack 4-1, lifting platform 4-2, second telescopic bracket 4-3, concrete cutting system 5, second sliding track 5-1, telescopic rod 5-2, diamond cutting saw 5-3, steel column support system 6, steel column support gripper 6-1, third telescopic bracket 6-2, third sliding track 6-3, steel column support vertical rod 6-4, component hoisting system 7, fourth sliding track 7-1, hoisting base 7-2, rotating base 7-3, telescopic arm 7-4, hoisting gripper 7-5, fourth telescopic bracket 7-6, anti-falling fixing device 7-7, disassembly system moving device 8, first movable support foot 8-1, fifth sliding track 8-2, wheel 8-3, second movable support foot 8-4, third movable support foot 8-5, anti-tipping counterweight 8-6, shelving platform guardrail 9, disassembly system platform main body 10, safety operation room 11, laser measurement equipment 12, three-dimensional laser scanning measuring instrument 12-1, vertical rod 12-2, steel support system 13, steel support 13-1, mechanical lock 13-2, bolt fixing structure 13-3, steel column 14, bracket 15. Specific implementation mode

[0047] The present invention will be further described below in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be pointed out that for ordinary persons in the technical field, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0048] Embodiment 1

[0049] As an embodiment, as Figures 2 to 14 shown, a high-efficiency demolition system for steel-concrete combined internal support in deep foundation pits includes two-dimensional code information encoding 1, concrete internal support system 2, disassembly safety operation platform 4, concrete cutting system 5, steel column support system 6, component hoisting system 7 and disassembly system moving device 8.

[0050] The two-dimensional code information encoding 1 is fixed on each support component to be disassembled, and construction personnel can determine the information and encoding of the component to be disassembled through the two-dimensional code information encoding 1, so that the disassembly is carried out according to the design plan.

[0051] The concrete internal support system 2 includes a concrete internal support bracket gripper 2-1 and a first telescopic bracket 2-2; the concrete internal support bracket gripper 2-1 is used to fix the concrete internal support 3 to prevent the concrete internal support 3 from collapsing during the cutting process, threatening the project and personnel safety; the first telescopic bracket 2-2 is connected to the concrete internal support bracket gripper 2-1, and controls the height of the concrete internal support bracket gripper 2-1 in a bracket telescopic manner to meet the requirements of temporary support for concrete internal supports of different heights; the concrete internal support bracket gripper 2-1 and the first telescopic bracket 2-2 can move on the first sliding track 2-3 to adjust the position of the temporary support of the concrete internal support 3; the concrete cutting system 5 includes a second sliding track 5-1, a telescopic rod 5-2 and a diamond chain saw 5-3; the diamond chain saw 5-3 is fixed on the telescopic rod 5-2, and the height of the diamond chain saw 5-3 can be adjusted by using the telescopic rod 5-2 according to the height of the concrete internal support 3 to be cut to meet the requirements of cutting the concrete internal support 3; the telescopic rod 5-2 is fixed on the second sliding track 5-1, and the telescopic rod 5-2 and the diamond chain saw 5-3 can change positions along with the second sliding track 5-1 to meet the needs of cutting the concrete internal support 3.

[0052] The disassembly safety operation platform 4 includes a hydraulic jack 4-1, a lifting platform 4-2 and a second telescopic bracket 4-3; the lifting platform 4-2 can be adjusted in height through the second telescopic bracket 4-3 to meet the construction requirements; the hydraulic jack 4-1 is fixed on the lifting platform 4-2, and by adjusting the height of the lifting platform 4-2, the piston of the hydraulic jack 4-1 can be made to contact the bottom surface of the steel support 13-1 to be disassembled, and then the hydraulic jack 4-1 can be used to gradually relieve pressure during the disassembly of the steel support 13-1 to avoid excessive deformation of the foundation pit caused by too fast pressure relief of the steel support 13-1.

[0053] The steel column support system 6 includes a steel column support bracket gripper 6-1, a third telescopic bracket 6-2, a third sliding track 6-3 and a steel column support vertical rod 6-4; the steel column support bracket gripper 6-1 is fixed on the third telescopic bracket 6-2, and the horizontal position of the steel column support bracket gripper 6-1 can be adjusted through the third telescopic bracket 6-2, so that the steel column support bracket gripper 6-1 can fix the steel column 14 to ensure the stability of the steel column 14 during the cutting process; the steel column support vertical rod 6-4 for fixing the third telescopic bracket 6-2 is fixed on the third sliding track 6-3, and the horizontal position of the steel column support vertical rod 6-4 can be moved, thereby enabling precise fixing of the steel column 14.

[0054] The component hoisting system 7 includes: a fourth sliding track 7-1, a hoisting base 7-2, a rotating base 7-3, a telescopic arm 7-4, a hoisting gripper 7-5, a fourth telescopic support 7-6, and an anti-falling fixing device 7-7; the hoisting base 7-2 is fixed to the fourth sliding track 7-1, enabling the hoisting system 7 to flexibly change its position according to the requirements of project disassembly; the telescopic arm 7-4 is fixed to the rotating base 7-3 through the fourth telescopic support 7-6, enabling the hoisting system 7 to rotate flexibly, hoist the disassembled component, and place it in a designated area; at the same time, the fourth telescopic support 7-6 can change the height of the hoisting system 7; the hoisting gripper 7-5 is fixed to the fourth telescopic support 7-6 through the telescopic arm 7-4, and by using the telescopic function of the telescopic arm 7-4, the horizontal position of the hoisting gripper 7-5 can be adjusted; the anti-falling fixing device 7-7 is used to further fix the component to be hoisted in the hoisting gripper 7-5, and at the same time, it can prevent the component from falling due to the failure of the hoisting gripper 7-5.

[0055] It further includes a laser measurement device 12, and the laser measurement device 12 includes a three-dimensional laser scanning measuring instrument 12-1 and a vertical rod 12-2; the disassembly system moving device 8 includes a first movable support leg 8-1, a fifth sliding track 8-2, wheels 8-3, a second movable support leg 8-4, a third movable support leg 8-5, and an anti-tipping counterweight 8-6; the first movable support leg 8-1, the second movable support leg 8-4, and the third movable support leg 8-5 enable the steel-concrete composite internal support high-efficiency disassembly system in deep foundation pits to move freely on the ground with a large height difference without the need to hoist the device by a large crane; the anti-tipping counterweight 8-6 is placed at the tail edge of the disassembly system platform main body 10, which can be used to balance the gravity of the head and tail of the device and prevent the device from tipping during the process of entering the foundation pit.

[0056] The system adopts information and automation technologies. The three-dimensional laser scanning measuring instrument 12-1 is installed on the disassembly system platform main body 10 through the vertical rod 12-2, which can be used to scan and measure the components to be disassembled, and transmit the measurement data to the computer system in the safety operation room 11. According to the design scheme, the computer calculates the disassembly points of each component to be disassembled, and under the operation command of the computer, the mechanical device automatically completes steps such as the temporary support, cutting, and hoisting of the components to be disassembled; the disassembled components are hoisted and placed on the platform surrounded by the shelving platform guardrail 9 by the component hoisting system 7, which can prevent the components from slipping off the disassembly system platform main body 10.

[0057] The mass of the anti-tipping counterweight 8-6 can be adjusted according to the actual needs of the project to avoid tipping backward or forward caused by the excessive or insufficient mass of the anti-tipping counterweight 8-6.

[0058] In addition to the computer in the safety operation room 11, a temporary manual operation system is provided. If an error is detected in the mechanical operation during the computerized automatic operation, the mechanical automatic operation can be interrupted and corrected by manual operation.

[0059] Embodiment 2

[0060] As another embodiment, the construction method of the high-efficiency demolition system for the steel-concrete composite internal support in the deep foundation pit described in Embodiment 1 is as Figure 1 shown, and the method includes the following steps:

[0061] Step 1: Generation and arrangement of two-dimensional code information encoding. Before the disassembly of the steel-concrete composite internal support, according to the construction sequence, the components in each area are numbered. At the same time, component information and construction techniques related to disassembly can be incorporated into each two-dimensional code, and the generated two-dimensional code information encoding 1 is arranged at each component to be disassembled to ensure the orderly progress of the disassembly process;

[0062] Input the disassembly design data of the steel-concrete composite internal support into the control computer. Before construction, the disassembly construction plan and related data are input into the computer system in the safety operation room 11 to ensure the progress of automatic and information-based construction;

[0063] Step 2: The steel-concrete composite internal support demolition system enters the foundation pit. Using the moving device 8 of the demolition system, the high-efficiency demolition system for the steel-concrete composite internal support enters the foundation pit to be constructed. After one-third of the length of the platform main body 10 of the demolition system enters the foundation pit, the third movable support leg 8-5 is deployed. After the support leg is stable, the platform main body 10 of the demolition system continues to move into the foundation pit relative to the third movable support leg 8-5, and the third movable support leg 8-5 remains fixed relative to the foundation pit. After two-thirds of the length of the platform main body 10 of the demolition system enters the foundation pit, the second movable support leg 8-4 is continuously deployed. After the support leg is stable, the platform main body 10 of the demolition system continues to move into the foundation pit relative to the second movable support leg 8-4, and the second movable support leg 8-4 also remains fixed relative to the foundation pit. After the platform main body 10 of the demolition system completely enters the foundation pit, the first movable support leg 8-1 is deployed. Finally, the third movable support leg 8-5, the second movable support leg 8-4, and the first movable support leg 8-1 are simultaneously retracted until the bottom of the wheel 8-3 contacts the bottom surface of the foundation pit.

[0064] Step 3: Demolition and hoisting of the concrete internal support:

[0065] Measure the size of the concrete internal support with a three-dimensional laser scanner. Use the three-dimensional laser scanning measuring instrument 12-1 to measure the concrete internal support to be disassembled;

[0066] The computer calculates and determines the support and cutting points. After the measurement data of the 3D laser scanning measuring instrument 12-1 is transmitted into the computer system in the safety operation room 11, the computer system calculates and determines the support points and cutting points of each internal support according to the design plan, and issues corresponding instructions.

[0067] The temporary support of the concrete internal support is carried out. According to the instructions of the computer system, the concrete internal support support system 2 operates and realizes the temporary support of the concrete internal support 3.

[0068] The cutting and hoisting of the concrete internal support are carried out. The concrete internal support 3 is cut by the concrete cutting system 5, and the cut concrete blocks are hoisted to the temporary shelving platform through the component hoisting system 7.

[0069] Step Four: Disassembly and Hoisting of the Steel Support:

[0070] The 3D laser scanner measures the size of the steel support. The 3D laser scanning measuring instrument 12-1 is used to measure the steel support to be disassembled.

[0071] The computer calculates and determines the support and cutting points. After the measurement data of the 3D laser scanning measuring instrument 12-1 is transmitted into the computer system in the safety operation room 11, the computer system calculates and determines the support points and cutting points of each internal support according to the design plan, and issues corresponding instructions.

[0072] The hydraulic jack is depressurized step by step. The hydraulic jack 4-1 is used to temporarily support the steel support 13-1. At the same time, the unloading is carried out in three levels of 80%, 50%, and 0% of the pre-added axial force to avoid excessive deformation of the foundation pit caused by too fast depressurization of the steel support 13-1.

[0073] The mechanical lock bolts of the steel support are disassembled. The construction personnel disassemble the mechanical lock bolts of the steel support on the disassembly safety operation platform 4.

[0074] The disassembly and hoisting placement of the steel support are carried out. The disassembled steel internal support is hoisted to the temporary shelving platform by the component hoisting system 7. Among them, some small parts can be directly put into the storage bag and temporarily placed on the disassembly safety operation platform 4, and then uniformly moved to the designated position after the steel support in this area is demolished.

[0075] Step Five: Disassembly and Hoisting of the Steel Column:

[0076] The 3D laser scanner measures the size of the steel column. The 3D laser scanning measuring instrument 12-1 is used to measure the steel column to be disassembled.

[0077] The computer calculates and determines the temporary support and cutting points of the profiled steel columns. After the measurement data of the 3D laser scanner 12-1 is transmitted into the computer system in the safety operation room 11, the computer system calculates and determines the support points and cutting points of the profiled steel columns according to the design scheme and issues corresponding instructions;

[0078] Temporary support of the profiled steel columns. According to the instructions of the computer system, the support system 6 of the profiled steel columns operates and realizes the temporary support of the profiled steel columns 14;

[0079] Bracket cutting and hoisting. After the disassembly safety operation platform 4 is lifted to the designated height, the construction workers cut the bracket 15 on the disassembly safety operation platform 4 and use the component hoisting system 7 to hoist the disassembled bracket to the temporary storage platform;

[0080] Cutting and hoisting of the profiled steel columns. The construction workers cut the profiled steel columns 14 layer by layer in sequence from top to bottom on the disassembly safety operation platform 4 and use the component hoisting system 7 to hoist the disassembled profiled steel column components to the temporary storage platform;

[0081] Step Six: The steel-concrete composite internal support disassembly system leaves the foundation pit.

[0082] Before hoisting the components, it is necessary to determine whether the anti-falling fixing device 7-7 has moved to the appropriate position to ensure the fixation of the components to be hoisted; if the components to be hoisted are unstable, ropes or steel cables can be used to further fix the components to the hoisting gripper 7-5 to prevent the components from falling from a height and threatening the safety of personnel, projects and machinery.

Claims

1. An efficient demolition system for steel-concrete composite internal support in deep foundation pits, characterized in that, it includes: a concrete internal support retaining system (2), a disassembly safety operation platform (4), a concrete cutting system (5), a steel column retaining system (6), a component hoisting system (7) and a disassembly system mobile device (8); the disassembly system mobile device (8) includes wheels (8-3) and movable feet; The concrete internal support retaining system (2) includes a concrete internal support bracket gripper (2-1) and a first telescopic bracket (2-2); The concrete internal support bracket gripper (2-1) is fixedly connected to the concrete internal support (3); the first telescopic bracket (2-2) is connected to the concrete internal support bracket gripper (2-1), and the bottom of the first telescopic bracket (2-2) is slidably connected to the first sliding track (2-3); The concrete cutting system (5) includes a second sliding track (5-1) and a diamond chain saw (5-3); the diamond chain saw (5-3) is slidably connected to the second sliding track (5-1) through a telescopic rod (5-2); the disassembly safety operation platform (4) includes a hydraulic jack (4-1) and a lifting platform (4-2); a second telescopic bracket (4-3) is provided at the bottom of the lifting platform (4-2); the hydraulic jack (4-1) is fixed on the lifting platform (4-2), and the hydraulic jack (4-1) contacts the bottom surface of the steel support (13-1); The steel column retaining system (6) includes a steel column bracket gripper (6-1), a third telescopic bracket (6-2), a third sliding track (6-3) and a steel column bracket vertical rod (6-4); the steel column bracket gripper (6-1) is fixed to the third telescopic bracket (6-2), and the steel column bracket gripper (6-1) is fixedly connected to the steel column (14); the third telescopic bracket (6-2) is slidably connected to the third sliding track (6-3) through the steel column bracket vertical rod (6-4).

2. The efficient demolition system for steel-concrete composite internal support in deep foundation pits according to claim 1, characterized in that: The component hoisting system (7) includes a fourth sliding track (7-1), a hoisting base (7-2), a rotating base (7-3), a telescopic arm (7-4), a hoisting gripper (7-5), a fourth telescopic bracket (7-6) and an anti-falling fixing device (7-7); the hoisting base (7-2) is slidably connected to the fourth sliding track (7-1); the telescopic arm (7-4) is fixed to the rotating base (7-3) through the fourth telescopic bracket (7-6); the hoisting gripper (7-5) is fixed to the fourth telescopic bracket (7-6) through the telescopic arm (7-4); the anti-falling fixing device (7-7) is provided below the hoisting gripper (7-5).

3. The efficient demolition system for steel-concrete composite internal support in deep foundation pits according to claim 1, characterized in that: The disassembly system mobile device (8) is arranged below the disassembly system platform main body (10). The movable feet include a first movable foot (8-1), a second movable foot (8-4) and a third movable foot (8-5); the disassembly system mobile device (8) further includes a fifth sliding track (8-2) and an anti-tipping counterweight (8-6); the movable feet are arranged on the lower surface of the disassembly system platform main body (10) through the fifth sliding track (8-2); the anti-tipping counterweight (8-6) is placed at the tail edge of the disassembly system platform main body (10).

4. The high-efficiency demolition system for steel-concrete composite internal support in deep foundation pits according to claim 1, characterized in that: it further includes a laser measurement device (12), and the laser measurement device (12) includes a three-dimensional laser scanning measuring instrument (12-1) and a vertical rod (12-2); the three-dimensional laser scanning measuring instrument (12-1) is installed on the disassembly system platform main body (10) through the vertical rod (12-2), and the three-dimensional laser scanning measuring instrument (12-1) is connected to the computer system in the safety operation room (11).

5. The high-efficiency demolition system for steel-concrete composite internal support in deep foundation pits according to claim 1, characterized in that: QR code information coding (1) is provided on the concrete internal support (3), the steel support system (13) and the steel column (14).

6. The construction method of the high-efficiency demolition system for steel-concrete composite internal support in deep foundation pits as described in any one of claims 1 to 5, characterized in that, it includes the following steps: Step 1: Arrange the QR code information coding (1) at each component to be disassembled according to the construction sequence; input the relevant data into the computer system in the safety operation room (11); Step 2: Use the disassembly system mobile device (8) to make the steel-concrete composite internal support demolition system enter the foundation pit to be constructed; Step 3: Demolition and hoisting of the concrete internal support: Use the three-dimensional laser scanning measuring instrument (12-1) to determine the cutting points; carry out temporary support for the concrete internal support (3) through the concrete internal support support system (2); use the concrete cutting system (5) to cut the concrete internal support (3), and hoist it to the temporary shelving platform through the component hoisting system (7); Step 4: Demolition and hoisting of the steel support: Measure the steel support and determine the cutting points; use the hydraulic jack (4-1) to carry out temporary support for the steel support (13-1) and gradually depressurize; disassemble the steel support (13-1) on the disassembly safety operation platform (4); and hoist it to the temporary shelving platform through the component hoisting system (7); Step 5: Demolition and hoisting of the steel column: Measure the steel column to be disassembled; determine the cutting points, and the steel column support system (6) operates to achieve temporary support for the steel column (14); after the disassembly safety operation platform (4) rises to the specified height, cut the bracket (15) and hoist it to the temporary shelving platform through the component hoisting system (7); on the disassembly safety operation platform (4), cut the steel column (14) layer by layer in the order from top to bottom, and hoist it to the temporary shelving platform through the component hoisting system (7); Step 6: The steel-concrete composite internal support disassembly system leaves the foundation pit.

7. The construction method of the high-efficiency demolition system for the steel-concrete composite internal support of deep foundation pits according to claim 6, characterized in that: In Step 2: After one-third of the length of the disassembly system platform main body (10) enters the foundation pit through the wheels (8-3), the third movable support leg (8-5) is deployed. After the support leg is stable, the disassembly system platform main body (10) continues to move into the foundation pit, and the third movable support leg (8-5) remains fixed relative to the foundation pit; after two-thirds of the length of the disassembly system platform main body (10) enters the foundation pit, the second movable support leg (8-4) is continuously deployed. After the support leg is stable, the disassembly system platform main body (10) continues to move into the foundation pit, and the second movable support leg (8-4) also remains fixed relative to the foundation pit. After the disassembly system platform main body (10) completely enters the foundation pit, the first movable support leg (8-1) is deployed; finally, the third movable support leg (8-5), the second movable support leg (8-4), and the first movable support leg (8-1) are simultaneously retracted to lower the disassembly system platform main body (10) until the bottom of the wheels (8-3) contacts the bottom surface of the foundation pit.

8. The construction method of the high-efficiency demolition system for the steel-concrete composite internal support of deep foundation pits according to claim 6, characterized in that: In Steps 3 to 5, before hoisting the components, the anti-falling fixing device (7-7) is moved to a suitable position, and the components can also be further fixed to the hoisting gripper (7-5) using ropes or steel cables.

9. The construction method of the high-efficiency demolition system for the steel-concrete composite internal support of deep foundation pits according to claim 6, characterized in that: In Step 4: The hydraulic jack (4-1) performs three-level step-by-step pressure relief on the steel support (13-1) according to 80%, 50%, and 0% of the pre-applied axial force.

10. The construction method of the high-efficiency demolition system for the steel-concrete composite internal support of deep foundation pits according to claim 7, characterized in that: In Step 6: The method for the steel-concrete composite internal support disassembly system to leave the foundation pit is opposite to the method in Step 2 for using the disassembly system moving device (8) to make the steel-concrete composite internal support demolition system enter the foundation pit to be constructed. Specifically, the third movable support leg (8-5), the second movable support leg (8-4), and the first movable support leg (8-1) are simultaneously extended to raise the disassembly system platform main body (10); then the disassembly system platform main body (10) is moved out of the foundation pit, and the first movable support leg (8-1), the second movable support leg (8-4), and the third movable support leg (8-5) are gradually retracted according to the length of the disassembly system platform main body (10) leaving the foundation pit, so that the steel-concrete composite internal support disassembly system leaves the foundation pit.

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