A displacement loading device for a foundation pit concrete support

Abstract

The present application relates to a kind of displacement loading devices for foundation pit concrete support, be arranged in the recess of surrounding purlin, provide support for the surrounding wall above, including two first wedge, a second wedge, through center jack and threaded rod, the bottom surface of first wedge is in contact with the bottom surface of recess, two first wedge are oppositely arranged, the inclined surface of first wedge is located above and from the middle of recess to obliquely upwards is inclined;Second wedge includes two inclined surfaces, two inclined surfaces are respectively in contact with the inclined surface of two first wedge, the top surface of second wedge is in contact with surrounding wall;Through center jack is arranged in the outside of one of first wedge;Threaded rod is in turn horizontally through two first wedge, and one end is connected with through center jack, the other end is connected with another first wedge.This application uses through center jack to exert small top force to generate larger concrete support axial force.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support engineering, and more particularly to a displacement loading device for foundation pit concrete support. Background Technology

[0002] Concrete supports offer advantages such as high structural stiffness, high safety, and flexible arrangement, making them widely used in soft soil foundation pits. However, reinforced concrete supports inside the foundation pit are typically passively loaded structures. Only when the retaining wall experiences horizontal displacement and deformation, generating horizontal compressive force on the concrete supports, can the concrete supports provide horizontal resistance to the retaining wall.

[0003] For example, Chinese patent application number 202121654653.3 and publication number CN 215857743U discloses an automatically adjustable deformation reinforced concrete support structure. This structure uses large-tonnage jacks within a recessed concrete waler to dynamically adjust the axial force of the concrete support on the retaining wall, while also regulating the deformation within the foundation pit. However, adjusting the axial force of the concrete support is often affected by time constraints and structural damage caused by insufficient force or malfunction of the large-tonnage jacks during loading. This impacts the overall construction progress, consumes significant manpower and resources, and may even lead to substantial foundation pit displacement. Since concrete creep is time-sensitive, if not addressed promptly, it can negatively affect the structure of the concrete support beam itself. Summary of the Invention

[0004] The present invention provides a displacement loading device for concrete support of foundation pits to solve the above-mentioned technical problems.

[0005] To address the aforementioned technical problems, this invention provides a displacement loading device for supporting concrete foundation pits. The device is installed within a groove in the waler to provide support for the upper retaining wall. It includes two first wedge blocks, one second wedge block, a through-type jack, and a threaded rod.

[0006] The bottom surface of the first wedge block contacts the bottom surface of the groove, and the two first wedge blocks are arranged opposite each other. The inclined surface of the first wedge block is located on top and slopes upward from the middle of the groove.

[0007] The second wedge includes two inclined surfaces, which respectively contact the inclined surfaces of the two first wedges, and the top surface of the second wedge contacts the enclosure wall;

[0008] The through-hole jack is positioned on the outside of one of the first wedge blocks; the threaded rod passes horizontally through the two first wedge blocks in sequence, with one end connected to the through-hole jack and the other end connected to the other first wedge block.

[0009] Preferably, the inclination angle θ of the inclined surfaces of the second wedge and the first wedge is 5° to 30°.

[0010] Preferably, the bottom surface of the first wedge block is in parallel contact with the bottom surface of the groove; the inclined surface of the second wedge block is in parallel contact with the inclined surface of the first wedge block.

[0011] Preferably, a lubricating layer is provided between the bottom surface of the first wedge block and the bottom surface of the groove, and between the inclined surface of the second wedge block and the inclined surface of the first wedge block.

[0012] Preferably, the lubricating layer is made of PTFE sheet.

[0013] Preferably, one end of the threaded rod is fixed to the outside of one of the first wedge blocks with a nut; the other end of the threaded rod is fixed to the outside of the other first wedge block with the through-hole jack.

[0014] Preferably, the two first wedge blocks are arranged in an axisymmetric structure, and the two first wedge blocks are made of the same material and have the same specifications; the second wedge block is formed by welding together two first wedge blocks of the same material and specifications.

[0015] Compared with the prior art, the displacement loading device for concrete support of foundation pits provided by the present invention has the following advantages:

[0016] 1. The present invention can use a through-hole jack to generate tension on the first wedge block and compress the second wedge block. By applying a small jacking force with the through-hole jack, a large axial force of concrete support can be generated, so as to reduce the deformation of the retaining structure into the pit.

[0017] 2. This invention can also greatly save loading time, and is easy to install and disassemble as a whole, thus saving time and effort. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a displacement loading device for concrete support of a foundation pit according to a specific embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the mechanical model of a displacement loading device for concrete support of a foundation pit according to a specific embodiment of the present invention.

[0020] In the diagram: 01-waler, 02-groove; 10-first wedge block, 20-second wedge block, 30-through-type jack, 40-threaded rod, 41-nut, 50-lubricating layer. Detailed Implementation

[0021] To illustrate the technical solutions of the invention in more detail, specific embodiments are listed below to demonstrate the technical effects; it should be emphasized that these embodiments are used to illustrate the invention and are not intended to limit the scope of the invention.

[0022] The displacement loading device for concrete support of foundation pit provided by this invention, such as Figure 1 As shown, the groove 02 of the waler 01 provides support for the upper enclosure wall (not shown). In some embodiments, multiple displacement loading devices can be set according to factors such as the specifications and weight of the upper enclosure wall to provide uniform and effective support for the enclosure wall.

[0023] Specifically, the displacement loading device includes two first wedge blocks 10, one second wedge block 20, a through-hole jack 30, and a threaded rod 40. The bottom surface of the first wedge block 10 contacts the bottom surface of the groove 02. The two first wedge blocks 10 are arranged opposite each other, with the inclined surface of the first wedge block 10 located at the top and inclined upward from the middle of the groove 02. The second wedge block 20 includes two inclined surfaces, which respectively contact the inclined surfaces of the two first wedge blocks 10. The top surface of the second wedge block 20 contacts the retaining wall. The through-hole jack 30 is disposed on the outside of one of the first wedge blocks 10. The threaded rod 40 passes horizontally through the two first wedge blocks 10 in sequence, with one end connected to the through-hole jack 30 and the other end connected to the other first wedge block 10.

[0024] This invention solves the problems that may arise from time constraints and insufficient or malfunctioning force applied by large-tonnage jacks when adjusting the axial force of concrete supports. Simultaneously, by utilizing the principle of small-angle wedges, corresponding wedge blocks are set within the grooved concrete waler 01. Through-hole jacks 30 apply force to these wedge blocks, achieving a large axial force on the concrete support by applying a small jacking force during foundation pit construction. This significantly saves loading time, facilitates installation, and allows for easy overall disassembly, thus reducing the deformation of the retaining structure into the foundation pit in a time-saving and labor-saving manner.

[0025] In some embodiments, please refer to the following: Figure 2 The inclination angle θ of the inclined surfaces of the second wedge block 20 and the first wedge block 10 is 5° to 30°, so that the load and displacement provided by the through-hole jack 30 can be smoothly transmitted to the first wedge block 10 and the second wedge block 20.

[0026] This application utilizes a simple mechanical conversion principle to achieve the effect of generating a large-tonnage supporting force and a small displacement using the force of a small-tonnage jack. Specifically, the through-hole jack 30 applies a horizontal force F, and the through-hole jack 30 pushes the first wedge block 10, causing a horizontal displacement δ. hThen, through a simple mechanical transformation relationship, the vertical reaction force N = 2Fctgθ generated by the second wedge block 20 is finally calculated, and the second wedge block 20 undergoes a vertical displacement δ. v =δ h tanθ. Therefore, the displacement loading device provided in this application can generate a large axial force on the concrete support by applying a small jacking force during foundation pit construction. In practical applications, an appropriate angle θ can be selected according to specific needs.

[0027] In some embodiments, please refer to the following: Figure 1 The bottom surface of the first wedge block 10 is in parallel contact with the bottom surface of the groove 02; the inclined surface of the second wedge block 20 is in parallel contact with the inclined surface of the first wedge block 10. This surface contact reduces friction and minimizes wear between components. In some embodiments, please refer to... Figure 1 A lubrication layer 50 is provided between the bottom surface of the first wedge block 10 and the bottom surface of the groove 02, and between the inclined surface of the second wedge block 20 and the inclined surface of the first wedge block 10. This is to further reduce the friction of each contact surface. In some embodiments, the lubrication layer 50 can be made of PTFE sheet (or coated with grease), or other lubrication methods can be used as long as they do not affect the mutual sliding of each contact surface.

[0028] In some embodiments, please refer to Figure 1 and Figure 2 The threaded rod 40 has a solid circular cross-section and high rigidity to improve its tensile strength.

[0029] In some embodiments, please refer to Figure 1 and Figure 2 One end of the threaded rod 40 is fixed to the outside of one of the first wedge blocks 10 with a nut 41; the other end of the threaded rod 40 is fixed to the outside of the first wedge block 10 with the through-hole jack 30. In other words, after the two ends of the threaded rod 40 extend from the outside of the two first wedge blocks 10 respectively, one end is fixed by the nut 41, and the other end is fixed to the through-hole jack 30. When the through-hole jack 30 applies force, the effect is equivalent to the tensioning principle of prestressed steel strand.

[0030] In some embodiments, please refer to Figure 1The two first wedge blocks 10 are arranged in an axisymmetric structure, and both first wedge blocks 10 are made of the same material and have the same specifications, and also have high rigidity. This ensures that the first wedge blocks 10 on both sides have the same physical properties, preventing them from being squeezed and deformed or damaged by the force applied by the through-hole jack 30, and also preventing structural instability caused by uneven force or inconsistent displacement on both sides. In some embodiments, the second wedge block 20 is formed by welding two first wedge blocks 10 of the same material and specifications together. This reduces the manufacturing cost of the components and further avoids squeezing deformation and damage caused by the reaction force applied by the first wedge blocks 10, ensuring uniform and stable structural stress.

[0031] In summary, the displacement loading device for supporting concrete foundation pits provided by the present invention is installed in the groove of the waler 01 to provide support for the upper retaining wall. It includes two first wedge blocks 10, one second wedge block 20, a through-hole jack 30, and several threaded rods 40. The bottom surface of the first wedge block 10 contacts the bottom surface of the groove 02. The two first wedge blocks 10 are arranged opposite each other, with the inclined surface of the first wedge block 10 located at the top and inclined upward from the middle of the groove 02. The second wedge block 20 includes two inclined surfaces, which respectively contact the inclined surfaces of the two first wedge blocks 10. The top surface of the second wedge block 20 contacts the retaining wall. The through-hole jack 30 is located on the outside of one of the first wedge blocks 10. The threaded rods 40 pass horizontally through the two first wedge blocks 10 in sequence, with one end connected to the through-hole jack 30 and the other end connected to the other first wedge block 10. This invention solves the problems that may arise from time constraints and insufficient or malfunctioning force applied by large-tonnage jacks when adjusting the axial force of concrete supports. Simultaneously, by utilizing the principle of small-angle wedges, corresponding wedge blocks are set within the grooved concrete waler 01. Through-hole jacks 30 apply force to these wedge blocks, achieving a large axial force on the concrete support through the application of a small jacking force during foundation pit construction. This significantly saves loading time, facilitates installation and overall disassembly, and reduces deformation of the retaining structure into the pit, thus saving time and effort.

[0032] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A displacement loading device for supporting concrete foundation pits, disposed within a groove in a waler to provide support for the upper retaining wall, characterized in that, It includes two first wedge blocks, one second wedge block, a through-type jack, and a threaded rod. The bottom surface of the first wedge block contacts the bottom surface of the groove, and the two first wedge blocks are arranged opposite each other. The inclined surface of the first wedge block is located on top and slopes upward from the middle of the groove. The second wedge includes two inclined surfaces, which respectively contact the inclined surfaces of the two first wedges, and the top surface of the second wedge contacts the enclosure wall; The through-hole jack is disposed on the outside of one of the first wedge blocks; the threaded rod passes horizontally through two of the first wedge blocks in sequence, with one end connected to the through-hole jack and the other end connected to the other first wedge block; one end of the threaded rod is fixed to the outside of one of the first wedge blocks with a nut; the other end of the threaded rod is fixed to the outside of the other first wedge block with the through-hole jack. The bottom surface of the first wedge block is in parallel contact with the bottom surface of the groove; the inclined surface of the second wedge block is in parallel contact with the inclined surface of the first wedge block; a lubricating layer is provided between the bottom surface of the first wedge block and the bottom surface of the groove, and between the inclined surface of the second wedge block and the inclined surface of the first wedge block; The two first wedge blocks are arranged in an axisymmetric structure, and the two first wedge blocks are made of the same material and have the same specifications; the second wedge block is formed by welding together two first wedge blocks of the same material and specifications.

2. The displacement loading device for concrete support of foundation pit as described in claim 1, characterized in that, Inclination angles of the inclined surfaces of the second wedge and the first wedge θ The range is 5° to 30°.

3. The displacement loading device for concrete support of foundation pits as described in claim 1, characterized in that, The lubricating layer is made of PTFE sheet.

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