A modular steel support segmented connection structure and its construction method

Abstract

This invention relates to a modular steel support segmented connection structure and construction method. The structure includes a modular frame system and an aerial sectioning system. The modular frame system is vertically spliced ​​from at least one standard section unit. Each standard section unit includes a horizontal hydraulic servo steel support and two vertical connecting rods. The hydraulic servo steel support has intelligent top-wall connectors at both ends. The vertical connecting rods have quick mechanical connectors at both ends. The aerial sectioning system is detachably installed on both sides of the slot. The aerial sectioning system includes a working support platform, a temporary frame positioning system, a verticality detection system, and a positioning and fastening device. The temporary frame positioning system is connected below the working support platform and has a clamping device for temporarily fastening the uppermost part of the installed modular frame system. The verticality detection system is installed on the working support platform, and the positioning and fastening device is movably installed on the working support platform.

Description

Technical Field

[0001] This invention belongs to the technical field of geotechnical engineering and underground structure engineering, and specifically relates to a combined steel support segmented connection structure and construction method. Background Technology

[0002] In urban underground engineering construction, long and narrow deep foundation pits, due to their length being much greater than their width, are prone to deformation phenomena such as central bulging and inward tilting during excavation, known as the "long-side effect." Traditional support methods, such as concrete supports and steel supports, have the following shortcomings: concrete supports have a long construction period, are difficult to dismantle, and affect subsequent operations; steel supports require simultaneous excavation and support, making it impossible to apply prestress in advance, resulting in delayed deformation control.

[0003] Traditional steel support construction follows a passive, cyclical model of "excavating one layer and installing one layer." Its core process is: excavating earth to the design elevation of the support → removing the concrete surface of the diaphragm wall → hoisting the steel support and applying prestress → welding or bolting. These processes are mutually restrictive, resulting in a long construction period. On-site installation of the steel support is highly dependent on large hoisting equipment, and welding quality is significantly affected by environmental factors.

[0004] Therefore, how to provide a modular steel support segmented connection structure and construction method that can actively apply prestress before excavation, is suitable for narrow foundation pits, is efficient in construction, and is recyclable is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides a segmented connection structure and construction method for combined steel supports. The combined steel supports are connected at nodes, which changes the traditional mode of excavating one layer and installing one layer of support. Instead, a trenching method is used to first install prefabricated combined steel supports, and a servo steel support system is used to support the deep foundation pit. After backfilling and reinforcement, earthwork excavation is carried out again, shortening the construction period and achieving rapid assembly and intelligent construction.

[0006] To solve the above technical problems, the present invention includes the following technical solutions:

[0007] A modular steel support segmented connection structure, comprising:

[0008] A modular frame system is formed by vertically splicing at least one standard section unit; each standard section unit includes a horizontal hydraulic servo steel support and two vertical connecting rods, with intelligent ceiling-wall connectors integrated at both ends of the hydraulic servo steel support, and pressure sensors and hydraulic cylinders embedded inside the intelligent ceiling-wall connectors; quick mechanical connectors are provided at both ends of the vertical connecting rods;

[0009] An aerial sectioning system is detachably installed on both sides of the slot. The aerial sectioning system includes a working support platform, a temporary frame positioning system, a verticality detection system, and a positioning and fastening device. The working support platform provides an operating surface for construction personnel. The temporary frame positioning system is connected below the working support platform and is equipped with a clamping device for temporarily fastening the uppermost part of the installed modular frame system. The verticality detection system is installed on the working support platform to detect the verticality of the standard section unit to be installed or the already installed modular frame system in real time. The positioning and fastening device is movably installed on the working support platform to grasp and stabilize the standard section unit to be spliced ​​and to fine-tune its position in the horizontal direction to achieve precise alignment with the already installed modular frame system below.

[0010] Furthermore, the quick mechanical connection is a pin system with a self-locking wedge.

[0011] Furthermore, the temporary positioning system for the frame also includes a vertical guide rail connected to the working support platform, the vertical guide rail being used to contact the modular frame system during descent to provide limiting and guidance.

[0012] Furthermore, the aerial sectioning system also includes an automatic hoisting device, which is connected to the modular frame system via a steel wire rope for controlling its lowering.

[0013] Furthermore, it also includes an automatic detection and obstacle removal system that integrates a 3D scanner to scan the floor wall, intelligently identify bulges or protrusions, and perform targeted obstacle removal based on the 3D scan drawings.

[0014] The present invention also provides a construction method for a combined steel support segmented connection structure, comprising the following steps:

[0015] Step S1: Provide the segmented connection structure of the combined steel support;

[0016] Step S2, Trench preparation and obstacle removal: Excavate the trench at the preset position on the long side wall of the foundation pit and reinforce the trench wall; use an automatic detection and obstacle removal system with an integrated 3D scanner to scan the surface of the underground continuous wall of the trench, identify and locate bulges or protrusions, and then remove them at specific points.

[0017] Step S3, Installation of the aerial section addition system: Install the aerial section addition system on both sides of the trough section;

[0018] Step S4, First Frame Installation and Vertical Adjustment: Hoist the first modular frame system onto the temporary frame positioning system, use the verticality detection system to detect its verticality, and adjust it using the vertical adjustment device on the temporary frame positioning system until the design requirements are met, and then temporarily lock it.

[0019] Step S5, Standard Section Unit Aerial Addition and Vertical Adjustment: The standard section unit to be installed is hoisted onto the working support platform. The positioning and fastening device is activated to grab and stabilize the standard section unit. The verticality detection system is activated to detect its verticality. The control system automatically calculates the adjustment amount based on the detection data and instructs the positioning and fastening device to adjust the posture of the standard section unit so that it is aligned with the modular frame system already installed below. The two are spliced ​​and fixed together using the quick mechanical connector.

[0020] Step S6, Frame Lowering and Repeated Section Addition: Loosen the temporary frame positioning system, and lower the assembled modular frame system a certain distance using the automatic hoisting device until its top is located at the temporary frame positioning system. Temporarily lock and adjust the verticality again. Repeat steps S5 to S6 until all standard section units are assembled, so that the uppermost hydraulic servo steel support reaches the design elevation.

[0021] Step S7, Trench backfilling: Backfill soil into the trench and reinforce it;

[0022] Step S8, Layered Excavation and Servo Support Activation: Excavate the earthwork. When the excavation reaches the design elevation of any layer of hydraulic servo steel support, stop the excavation and start the hydraulic cylinders at both ends of the hydraulic servo steel support of that layer to actively push it to the underground continuous wall until its axial force reaches the design value and is locked, so that the support of that layer starts to work.

[0023] Step S9, Cyclic Construction: Continue excavating the earth downwards and repeat step S8 until the foundation pit is excavated to the design elevation, and all levels of the hydraulic servo steel supports are activated.

[0024] Furthermore, step S8 also includes continuously monitoring the deformation of the diaphragm wall, the axial force of the modular frame system, and the surrounding settlement data during the construction process, and adjusting the axial force of the hydraulic servo steel support in real time based on the monitoring data.

[0025] Furthermore, it also includes step S10, support dismantling and recycling: after the internal structure of the foundation pit is completed and reaches the strength requirements, the axial force of the hydraulic servo steel supports of each layer is gradually unloaded, and the modular frame system is disassembled in sections and lifted out of the foundation pit by the aerial sectioning system in the reverse order of steps S5 to S6, so as to realize reuse.

[0026] Furthermore, in step S4, the vertical adjustment device is a jack, which together with the dual-axis inclinometer constitutes a verticality closed-loop control system.

[0027] Furthermore, in step S5, the adjustment of the standard section unit's posture by the positioning and fastening device includes fine-tuning the horizontal position and precise adjustment of the verticality.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The present invention provides a segmented connection structure and construction method for combined steel supports. By connecting the combined steel supports at nodes, it changes the traditional method of excavating one layer and installing one layer of supports. Instead, it adopts a trenching method, first installing prefabricated combined steel supports, then using a servo steel support system to support the deep foundation pit, and finally backfilling and reinforcing the pit before excavating again. This shortens the construction period and enables rapid assembly and intelligent construction. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a combined steel support segmented connection structure according to an embodiment of the present invention.

[0031] In the picture:

[0032] 1-Hydraulic servo steel support, 2-Vertical connecting rod, 3-Intelligent top and wall connector, 4-Working support platform, 5-Frame temporary positioning system, 6-Verticality detection system, 7-Positioning and fastening device. Detailed Implementation

[0033] The following detailed description, in conjunction with specific embodiments, provides a further detailed explanation of the combined steel support segmented connection structure and construction method provided by the present invention. The advantages and features of the present invention will become clearer from the following description.

[0034] The following is combined Figure 1 The structural composition of the combined steel support segmented connection structure of the present invention is described in detail.

[0035] Example 1

[0036] The present invention is described below with reference to the accompanying drawings and specific embodiments. A combined steel support segmented connection structure includes a modular frame system and an aerial sectioning system. The modular frame system is vertically spliced ​​from at least one standard section unit. Each standard section unit includes a horizontal hydraulic servo steel support 1 and two vertical connecting rods 2. Intelligent ceiling-wall connectors 3 are integrated at both ends of the hydraulic servo steel support 1. Pressure sensors and hydraulic cylinders are embedded inside the intelligent ceiling-wall connectors 3. Quick mechanical connectors are provided at both ends of the vertical connecting rods 2.

[0037] The aerial sectioning system is detachably installed on both sides of the slot. The aerial sectioning system includes a working support platform 4, a temporary frame positioning system 5, a verticality detection system 6, and a positioning and fastening device 7. The working support platform 4 provides an operating surface for construction personnel. The temporary frame positioning system 5 is connected to the bottom of the working support platform 4 and is equipped with a clamping device for temporarily fastening the uppermost part of the installed modular frame system. The verticality detection system 6 is installed on the working support platform 4 and is used to detect the verticality of the standard section unit to be installed or the installed modular frame system in real time. The positioning and fastening device 7 is movably set on the working support platform 4 and is used to grab and stabilize the standard section unit to be spliced, and to fine-tune its position in the horizontal direction to achieve precise alignment with the installed modular frame system below.

[0038] In this embodiment, more preferably, the quick mechanical connection is a pin system with a self-locking wedge.

[0039] In this embodiment, more preferably, the temporary frame positioning system 5 also includes a vertical guide rail, i.e., a wall-mounted guide rail (connected to the working support platform 4, with a length of 1.5 meters), which is used to contact the modular frame system during its descent to provide limiting and guidance.

[0040] In this embodiment, more preferably, the aerial sectioning system also includes an automatic hoisting device, which is connected to the modular frame system via a wire rope for controlling its lowering.

[0041] In this embodiment, more preferably, it also includes an automatic detection and obstacle removal system with an integrated 3D scanner, used to scan the wall, intelligently identify bulges or protrusions, and perform targeted obstacle removal based on the 3D scan drawings.

[0042] Please continue to refer to this. Figure 1 This invention also provides a construction method for a segmented connection structure of combined steel supports, employing a proactive pre-control process of supporting first and then excavating. Before the excavation of the foundation pit, the support system is assembled, positioned, and temporarily fixed during trenching. As excavation progresses, these pre-installed supports are activated layer by layer, enabling them to immediately exert their design bearing capacity. The construction method includes the following steps:

[0043] Step S1: Provide the segmented connection structure of the combined steel support;

[0044] Step S2, Trench preparation and obstacle removal: Excavate the trench at the preset position on the long side wall of the foundation pit and reinforce the trench wall; use an automatic detection and obstacle removal system with an integrated 3D scanner to scan the surface of the underground continuous wall of the trench, identify and locate bulges or protrusions, and then remove them at specific points.

[0045] Step S3, Installation of the aerial section addition system: Install the aerial section addition system on both sides of the tank section;

[0046] Step S4, First Frame Installation and Vertical Adjustment: Hoist the first modular frame system onto the temporary frame positioning system 5, use the verticality detection system 6 to detect its verticality, and use the vertical adjustment device on the temporary frame positioning system 5 (such as jacks and dual-axis inclinometers; the operator remotely controls the jacks to adjust the tilt of the first modular frame system in two directions according to the data from the dual-axis inclinometer through the control system) to adjust it until the design requirements are met, and then temporarily lock it.

[0047] Step S5, Standard Section Unit Aerial Addition and Vertical Adjustment: Hoist the standard section unit to be installed onto the working support platform 4, activate the positioning and fastening device 7 to grab and stabilize the standard section unit; activate the verticality detection system 6 to detect its verticality, the control system automatically calculates the adjustment amount based on the detection data, and instructs the positioning and fastening device 7 to adjust the posture of the standard section unit so that it is aligned with the modular frame system already installed below; splice and fix the two together using quick mechanical connectors;

[0048] Step S6, Frame lowering and repeated section addition: Loosen the temporary frame positioning system 5, and lower the assembled modular frame system a certain distance using the automatic hoisting device until its top is located at the temporary frame positioning system 5. Temporarily lock and adjust the verticality again. Repeat steps S5 to S6 until all standard section units are assembled, so that the uppermost hydraulic servo steel support reaches the design elevation.

[0049] Step S7, Trench backfilling: Backfill soil into the trench and reinforce it;

[0050] Step S8, Layered Excavation and Servo Support Activation: Excavate the earthwork. When the excavation reaches the design elevation of any layer of hydraulic servo steel support 1, stop the excavation and start the hydraulic cylinders at both ends of the hydraulic servo steel support 1 of that layer to actively push it to the underground continuous wall until its axial force reaches the design value and is locked, so that the support of that layer starts to work.

[0051] Step S9, Cyclic Construction: Continue excavating the earth downwards and repeat step S8 until the foundation pit is excavated to the design elevation and all levels of hydraulic servo steel supports 1 are activated.

[0052] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. The above embodiments only illustrate several implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A modular steel support segmented connection structure, characterized in that, include: A modular frame system is formed by vertically splicing at least one standard section unit; each standard section unit includes a horizontal hydraulic servo steel support and two vertical connecting rods, with intelligent ceiling-wall connectors integrated at both ends of the hydraulic servo steel support, and pressure sensors and hydraulic cylinders embedded inside the intelligent ceiling-wall connectors; quick mechanical connectors are provided at both ends of the vertical connecting rods; An aerial sectioning system is detachably installed on both sides of the slot. The aerial sectioning system includes a working support platform, a temporary frame positioning system, a verticality detection system, and a positioning and fastening device. The working support platform provides an operating surface for construction personnel. The temporary frame positioning system is connected below the working support platform and is equipped with a clamping device for temporarily fastening the uppermost part of the installed modular frame system. The verticality detection system is installed on the working support platform to detect the verticality of the standard section unit to be installed or the already installed modular frame system in real time. The positioning and fastening device is movably installed on the working support platform to grasp and stabilize the standard section unit to be spliced ​​and to fine-tune its position in the horizontal direction to achieve precise alignment with the already installed modular frame system below.

2. The combined steel support segmented connection structure according to claim 1, characterized in that, The quick mechanical connection is a pin system with a self-locking wedge.

3. The combined steel support segmented connection structure according to claim 2, characterized in that, The temporary positioning system for the frame also includes a vertical guide rail connected to the working support platform, which is used to contact the modular frame system during descent to provide limiting and guidance.

4. The combined steel support segmented connection structure according to claim 3, characterized in that, The aerial sectioning system also includes an automatic hoisting device, which is connected to the modular frame system via steel wire ropes to control its lowering.

5. The combined steel support segmented connection structure according to claim 4, characterized in that, It also includes an automatic detection and obstacle removal system with an integrated 3D scanner, which is used to scan the wall and intelligently identify bulges or protrusions, and perform targeted obstacle removal based on the 3D scan drawings.

6. A construction method for a segmented connection structure of combined steel supports, characterized in that, Includes the following steps: Step S1: Provide the combined steel support segmented connection structure as described in any one of claims 1 to 5; Step S2, Trench preparation and obstacle removal: Excavate trench sections at predetermined positions on the long sidewalls of the foundation pit and reinforce the trench walls; An automated detection and obstacle removal system using an integrated 3D scanner scans the surface of the underground continuous wall in the trench section to identify and locate bulges or protrusions, and then removes them at specific points. Step S3, Installation of the aerial section addition system: Install the aerial section addition system on both sides of the trough section; Step S4, First Frame Installation and Vertical Adjustment: Hoist the first modular frame system onto the temporary frame positioning system, use the verticality detection system to detect its verticality, and adjust it using the vertical adjustment device on the temporary frame positioning system until the design requirements are met, and then temporarily lock it. Step S5, Standard Section Unit Aerial Addition and Vertical Adjustment: The standard section unit to be installed is hoisted onto the working support platform. The positioning and fastening device is activated to grab and stabilize the standard section unit. The verticality detection system is activated to detect its verticality. The control system automatically calculates the adjustment amount based on the detection data and instructs the positioning and fastening device to adjust the posture of the standard section unit so that it is aligned with the modular frame system already installed below. The two are spliced ​​and fixed together using the quick mechanical connector. Step S6, Frame Lowering and Repeated Section Addition: Loosen the temporary positioning system of the frame, and lower the assembled modular frame system a certain distance using an automatic hoisting device until its top is located at the temporary positioning system of the frame. Temporarily lock and adjust the verticality again. Repeat steps S5 to S6 until all standard section units are assembled, so that the uppermost hydraulic servo steel support reaches the design elevation. Step S7, Trench backfilling: Backfill soil into the trench and reinforce it; Step S8, Layered Excavation and Servo Support Activation: Excavate the earthwork. When the excavation reaches the design elevation of any layer of hydraulic servo steel support, stop the excavation and start the hydraulic cylinders at both ends of the hydraulic servo steel support of that layer to actively push it to the underground continuous wall until its axial force reaches the design value and is locked, so that the support of that layer starts to work. Step S9, Cyclic Construction: Continue excavating the earth downwards and repeat step S8 until the foundation pit is excavated to the design elevation, and all levels of the hydraulic servo steel supports are activated.

7. The construction method according to claim 6, characterized in that, Step S8 also includes continuously monitoring the deformation of the diaphragm wall, the axial force of the modular frame system, and the surrounding settlement data during construction, and adjusting the axial force of the hydraulic servo steel support in real time based on the monitoring data.

8. The construction method according to claim 6, characterized in that, It also includes step S10, support dismantling and recycling: after the internal structure of the foundation pit is completed and reaches the strength requirements, the axial force of the hydraulic servo steel supports of each layer is gradually unloaded, and the modular frame system is disassembled in sections and lifted out of the foundation pit by the aerial sectioning system in the reverse order of steps S5 to S6, so as to realize reuse.

9. The construction method according to claim 6, characterized in that, In step S4, the vertical adjustment device is a jack, which together with the dual-axis inclinometer forms a verticality closed-loop control system.

10. The construction method according to claim 6, characterized in that, In step S5, the adjustment of the standard section unit's posture by the positioning and fastening device includes fine-tuning the horizontal position and precise adjustment of the verticality.

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