A deformation targeted control method suitable for construction near foundation pits

Abstract

The present invention discloses a deformation targeted control device suitable for construction near a foundation pit, comprising a steel support, a bolt and a plurality of groups of I-shaped steels, wherein the plurality of groups of I-shaped steels respectively constitute a pair of supports, an oblique support and an eight-shaped support of the foundation pit support, the plurality of groups of I-shaped steels are assembled and connected by bolts, a hydraulic cylinder is provided between two groups of the I-shaped steels, the oil inlet and the oil outlet of the hydraulic cylinder are connected and an oil tank is provided, the oil inlet pipe and the oil outlet pipe of the oil tank are respectively connected to the oil inlet and the oil outlet of the hydraulic cylinder, the oil inlet pipe is connected to the hydraulic pump, and the hydraulic pump is connected and provided with a control mechanism. The present invention performs one-way limiting on the hydraulic cylinder by cooperating with the limit block in the cylinder barrel of the control mechanism and the push rod slot, thereby effectively preventing the influence of slight deformation of the foundation pit on the hydraulic cylinder, and the controller controls the extension amount of the hydraulic cylinder push rod through the electrical signal fed back by the pressure sensor to avoid excessive deformation of the foundation pit.

Description

Technical Field

[0001] The present invention relates to the technical field of deformation control in foundation pit construction, and in particular to a deformation targeting control method suitable for construction adjacent to a foundation pit. Background Art

[0002] Foundation pit deformation refers to the displacement of the retaining structure under the action of the internal and external pressure difference due to the unloading of the excavation in the pit during foundation pit excavation, which in turn causes the deformation of the soil outside the retaining structure, causing the soil outside the foundation pit or the building (structure) to settle and move; during the excavation process, in order to protect the safety of the foundation pit itself and the surrounding building (structure) structures, some support structures are generally required to support the deep foundation pit, but as the construction time goes by, the steel support will produce stress relaxation and the prestress on the steel support will decrease. The existing technology usually uses jacks to apply prestress to the steel support. However, during the construction process, the foundation pit will undergo some minor deformations at all times, and the pressure of the oil in the hydraulic cylinder will also drop accordingly. In order to avoid excessive deformation of the foundation pit, it is necessary to adjust the extension of the hydraulic cylinder push rod in time, which requires manual operation, which undoubtedly greatly increases the workload of the staff. For this reason, we have designed a deformation targeted control method suitable for construction near the foundation pit. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem that as the construction time goes by, the steel support will produce stress relaxation, the prestress on the steel support will decrease, and it will be difficult to avoid excessive deformation of the foundation pit. A deformation targeted control method suitable for construction near the foundation pit is proposed.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A deformation targeted control device suitable for construction near a foundation pit, comprising a pair of braces, an oblique brace, an S-shaped brace, bolts and multiple groups of I-shaped steels, wherein the multiple groups of I-shaped steels respectively constitute the pair of braces, oblique braces and S-shaped brace of the foundation pit support, the multiple groups of I-shaped steels are assembled and connected by bolts, a hydraulic cylinder is provided between two groups of the I-shaped steels, the hydraulic cylinder comprises a push rod, a cylinder barrel, an oil inlet and an oil outlet, the oil inlet and the oil outlet of the hydraulic cylinder are connected to an oil tank, an oil inlet pipe and an oil outlet pipe are provided on the oil tank, the oil inlet pipe and the oil outlet pipe of the oil tank are respectively connected to the oil inlet and the oil outlet of the hydraulic cylinder, the oil inlet pipe is connected to the hydraulic pump, the hydraulic pump is composed of two tightly meshed gears, and the hydraulic pump is connected to a control mechanism.

[0006] Preferably, the control mechanism includes a servo motor and a controller. The output end of the servo motor is fixedly connected to one of the gears of the hydraulic pump via a shaft, and the controller is in circuit communication with the servo motor.

[0007] Preferably, the cylinder is provided with a groove, a spring is fixedly connected in the cylinder groove, the other end of the spring is fixedly connected to a limit block, and a plurality of slots are provided on the push rod.

[0008] Preferably, the bottom end of the hydraulic cylinder and the push rod are both fixedly connected with a gasket, and bolt holes are provided at the four corners of the gasket. One side of the gasket is fixedly connected to the hydraulic cylinder, and the other side is fixedly connected to the I-beam by bolts.

[0009] Preferably, a dust cover is provided coaxially with the upper portion of the cylinder and the push rod.

[0010] Preferably, a pressure sensor is provided at the gasket fixedly connected to the push rod, and the pressure sensor is connected to the controller circuit.

[0011] A method for using a deformation targeting control device suitable for construction near a foundation pit, characterized by comprising the following steps:

[0012] S1: First, steel purlins and tripods are set up on the retaining wall of the foundation pit. The required steel supports are assembled using multiple sets of I-beams and bolts. A hydraulic cylinder is fixed between the two steel supports using nuts and washers. The hydraulic cylinder is controlled by a control mechanism to apply prestress to the steel supports.

[0013] S2: After the hydraulic cylinder applies the predetermined prestress, the controller controls the hydraulic cylinder to stop pressurizing, and the limit block in the cylinder barrel is clamped into the groove on the ejector rod;

[0014] S3: When the foundation pit deforms, the pressure sensor at the gasket where the top rod is fixed will be subjected to pressure and feedback the electrical signal to the controller, which in turn controls the output end of the servo motor to operate;

[0015] S4: The output end of the servo motor drives the two tightly fitting gears of the hydraulic pump to mesh with the specified power according to the instructions of the controller to transport the oil in the oil tank to the hydraulic cylinder. The hydraulic cylinder converts the hydraulic energy of the oil into mechanical energy, driving the push rod to apply the corresponding axial force.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention limits the hydraulic cylinder in one direction by cooperating with the limit block in the cylinder barrel and the push rod slot in the control mechanism, effectively preventing the influence of slight deformation of the foundation pit on the hydraulic cylinder, and a pressure sensor connected to the controller is provided at the connection between the push rod and the gasket. Through the electrical signal fed back by the pressure sensor, the controller controls the extension amount of the hydraulic cylinder push rod to avoid excessive deformation of the foundation pit.

[0018] 2. The present invention adopts assembled node connection through steel support and actively applies prestress to achieve good overall stability. It is assembled with bolts on site and does not require welding. Compared with the one-time investment of reinforced concrete support, the steel support can basically be recycled and turned over many times, which greatly reduces the project cost.

[0019] 3. The present invention cooperates with the controller and the pressure sensor to control the servo motor to drive the hydraulic pump according to the electrical signal fed back by the hydraulic sensor. The hydraulic pump delivers a specific amount of oil into the hydraulic cylinder, which is finally converted into the axial force required by the steel support. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a deformation targeted control method applicable to construction near foundation pits proposed by the present invention;

[0021] Figure 2 This is a front view of a deformation targeted control method applicable to construction near foundation pits proposed by the present invention;

[0022] Figure 3 This is a partial diagram of a deformation targeted control method suitable for construction near foundation pits proposed by the present invention;

[0023] Figure 4 The present invention proposes a deformation targeted control method suitable for construction near foundation pits.

[0024] In the figure: 1. I-beam; 2. Gasket; 3. Hydraulic cylinder; 4. Oil inlet pipe; 5. Oil outlet pipe; 6. Oil tank; 7. Hydraulic pump; 8. Servo motor; 9. Controller; 10. Pressure sensor; 11. Spring; 12. Limit block; 13. Dust cover; 14. Slot; 15. Bolt; 16. Push rod; 17. Cylinder barrel. DETAILED DESCRIPTION

[0025] Reference Figure 1-Figure 4A deformation targeting control device suitable for construction near foundation pits includes steel supports, bolts 15 and multiple groups of I-shaped steel 1. Multiple groups of I-shaped steel 1 are used to form steel supports such as braces, diagonal braces and eight-shaped braces for foundation pit support. Multiple groups of I-shaped steel 1 are assembled and connected by bolts 15. A hydraulic cylinder 3 is provided between two groups of I-shaped steel 1. The hydraulic cylinder 3 is used to convert the hydraulic energy of the oil into mechanical energy to push the push rod 16 to apply axial force to the steel supports. The hydraulic cylinder 3 includes The push rod 16, the cylinder barrel 17, the oil inlet and the oil outlet, the oil inlet and the oil outlet of the hydraulic cylinder 3 are connected to the oil tank 6, the oil tank 6 is used to provide oil for the hydraulic cylinder 3, the oil tank 6 is provided with an oil inlet pipe 4 and an oil outlet pipe 5, the oil inlet pipe 4 and the oil outlet pipe 5 of the oil tank 6 are respectively connected to the oil inlet and the oil outlet of the hydraulic cylinder 3, the oil inlet pipe 4 is connected to the hydraulic pump 7, the hydraulic pump 7 is used to transport the oil in the oil tank 6 to the hydraulic cylinder 3, and the hydraulic pump 7 is composed of two tightly meshed gears;

[0026] The following points are worth noting:

[0027] 1. The steel supports are assembled on site, and the nodes are connected by bolts 15. After the support work is completed, it is easy to dismantle and can be used multiple times, which reduces the project cost.

[0028] 2. In this way, the controller 9 can control the output end of the servo motor 8 to operate at a specified power, and then control the hydraulic pump 7 to deliver specific oil to the hydraulic cylinder 3.

[0029] A hydraulic cylinder 3 for applying prestress is provided between the two I-shaped steels 1. A groove is provided on the inner wall of the cylinder barrel 17. A limit block 12 is fixedly connected to the groove via a spring 11. A plurality of slots 14 are provided on the side wall of the push rod 16.

[0030] It should be noted that the limiting block 12 cooperates with the clamping groove 14 to limit the hydraulic cylinder 3 in one direction, thereby effectively preventing the influence of slight deformation of the foundation pit on the hydraulic cylinder 3 .

[0031] The hydraulic cylinder 3 is provided with an oil inlet and an oil outlet, and the oil inlet and the oil outlet are connected to an oil tank 6. The oil tank 6 is provided with an oil inlet pipe 4 and an oil outlet pipe 5. The oil inlet pipe 4 and the oil outlet pipe 5 of the oil tank 6 are respectively connected to the oil inlet and the oil outlet of the hydraulic cylinder 3.

[0032] Furthermore, the oil inlet pipe 4 is connected to the hydraulic pump 7, which is composed of two tightly meshed gears. One of the gears of the hydraulic pump 7 is fixedly connected to the servo motor 8 through an axis. The controller 9 is circuit-connected to the servo motor 8 to facilitate the control of the servo motor 8. The hydraulic pump 7 is driven by the servo motor 8 to operate and the oil in the oil tank 6 is transported to the hydraulic cylinder 3.

[0033] Furthermore, a pressure sensor 10 is provided at the gasket 2 to which the push rod 16 is fixedly connected. The pressure sensor 10 is circuit-connected to the controller 9. The pressure sensor 10 feeds back the pressure received to the controller 9 through an electrical signal, and the controller 9 then controls the output end of the servo motor 8 to operate according to the specified power.

[0034] Furthermore, the servo motor 8 drives the two tightly fitting gears of the hydraulic pump 7 to mesh at a specified power according to the instructions of the controller 9 to transport the oil in the oil tank 6 to the hydraulic cylinder 3. The hydraulic cylinder 3 converts the hydraulic energy of the oil into mechanical energy, driving the push rod 16 to apply the corresponding axial force.

[0035] A method for using a deformation targeting control device suitable for construction near a foundation pit, characterized by comprising the following steps:

[0036] First, steel purlins and tripods are set up on the retaining wall of the foundation pit, and the required steel supports are assembled through multiple sets of I-shaped steel 1 and bolts 15. This reduces the one-time investment in reinforced concrete supports, and the combined assembly is recyclable, effectively reducing the project cost and construction period. The hydraulic cylinder 3 is fixed between the two steel supports through nuts 15 and washers 2. The hydraulic cylinder 3 is controlled by a control mechanism to give prestress to the steel supports.

[0037] After the hydraulic cylinder 3 applies a predetermined prestress, the controller 9 controls the hydraulic cylinder 3 to stop pressurizing, and the limit block 12 in the cylinder barrel 17 is clamped into the groove 14 on the push rod 16 to prevent the reaction force of the push rod 16 of the hydraulic cylinder 3 from being pushed back by the slight deformation of the foundation pit, thereby reducing the axial force applied by the hydraulic cylinder 3.

[0038] When the foundation pit deforms, the pressure sensor 10 at the gasket 2 to which the top rod 16 is fixed will be subjected to pressure and fed back to the controller 9 through an electrical signal. The controller 9 then controls the output end of the servo motor 8 to operate according to the specified power.

[0039] The output end of the servo motor 8 drives the two tightly fitting gears of the hydraulic pump 7 to engage at a specified power according to the instructions of the controller 9 to transport the oil in the oil tank 6 to the hydraulic cylinder 3. The hydraulic cylinder 3 converts the hydraulic energy of the oil into mechanical energy, and then drives the push rod 16 to apply the corresponding axial force.

[0040] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A deformation targeting control device suitable for construction near a foundation pit, comprising a steel support, bolts (15) and multiple groups of I-shaped steel (1), characterized in that: The multiple groups of I-shaped steel (1) respectively form the bracing, diagonal bracing and eight-shaped bracing of the foundation pit support, and the multiple groups of I-shaped steel (1) are assembled and connected by bolts (15). A hydraulic cylinder (3) is provided between two groups of I-shaped steel (1), and the hydraulic cylinder (3) includes a push rod (16), a cylinder barrel (17), an oil inlet and an oil outlet. The oil inlet and the oil outlet of the hydraulic cylinder (3) are connected to an oil tank (6), and an oil inlet pipe (4) and an oil outlet pipe (5) are provided on the oil tank (6). The oil inlet pipe (4) and the oil outlet pipe (5) of the oil tank (6) are respectively connected to the oil inlet and the oil outlet of the hydraulic cylinder (3). The oil inlet pipe (4) is connected to a hydraulic pump (7), and the hydraulic pump (7) is composed of two tightly meshed gears. The hydraulic pump (7) is connected to a control mechanism. The control mechanism comprises a servo motor (8) and a controller (9), wherein the output end of the servo motor (8) is fixedly connected to one of the gears of the hydraulic pump (7) via a shaft, and the controller (9) is in electrical communication with the servo motor (8); The cylinder (17) is provided with a groove, a spring (11) is fixedly connected in the groove of the cylinder (17), a limit block (12) is fixedly connected to the other end of the spring (11), and a plurality of slots (14) are provided on the push rod (16); The bottom end of the hydraulic cylinder (3) and the push rod (16) are both fixedly connected with a gasket (2), and bolt holes are provided at the four corners of the gasket (2). One side of the gasket (2) is fixedly connected to the hydraulic cylinder (3), and the other side is fixedly connected to the I-shaped steel (1) via bolts (15); A pressure sensor (10) is provided at the gasket (2) fixedly connected to the push rod (16), and the pressure sensor (10) is connected to the controller (9) circuit.

2. A deformation targeting control device suitable for construction near foundation pit according to claim 1, characterized in that: A dust cover (13) is provided on the upper portion of the cylinder (17) coaxially with the push rod (16).

3. A method for using the deformation targeting control device according to any one of claims 1-2, suitable for construction near a foundation pit, characterized in that: The following steps are involved: S1: First, a steel purlin and a tripod are set up on the retaining wall of the foundation pit, and the required steel support members are assembled through multiple sets of I-shaped steel (1) and bolts (15); a hydraulic cylinder (3) is fixed between two steel support members through nuts and washers (2), and the hydraulic cylinder is controlled by a control mechanism to give prestress to the steel support members; S2: After the hydraulic cylinder (3) applies a predetermined prestress, the controller (9) controls the hydraulic cylinder (3) to stop pressurizing, and the limit block (12) in the cylinder barrel (17) is clamped into the clamping groove (14) on the push rod (16); S3: When the foundation pit is deformed, the pressure sensor (10) at the gasket (2) to which the top rod (16) is fixedly connected will be subjected to pressure and fed back to the controller (9) through an electrical signal, and the controller (9) will then control the output end of the servo motor (8) to operate; S4: The servo motor (8) drives the two closely fitting gears of the hydraulic pump (7) at a specified power according to the instruction of the controller (9) to mesh and deliver the oil in the oil tank (6) to the hydraulic cylinder (3). The hydraulic cylinder (3) converts the hydraulic energy of the oil into mechanical energy and drives the push rod (16) to apply the corresponding axial force.

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