Concrete slab jacking device

Abstract

The application relates to the technical field of building construction equipment, in particular to a concrete slab jacking device which comprises a force holding frame, a jacking screw rod, a rotating nut and a rotating bearing box. The force holding frame is provided with expansion bolt fixing holes and can be fixed to a floor or a concrete structure; the jacking screw rod cooperates with the force holding frame to generate a jacking force, and the rotating nut drives the jacking screw rod to rotate; the rotating bearing box is internally provided with a plane thrust bearing and supports the jacking screw rod to rotate. The device can be selectively provided with expansion bolts, locking nuts and other components. The device can realize smooth and accurate jacking of the concrete slab, is labor-saving and reliable in fixation, is suitable for concrete structure maintenance and adjustment, and can improve construction efficiency and safety.

Description

Technical Field

[0001] This application relates to the field of construction equipment technology, and in particular to a concrete slab lifting device. Background Technology

[0002] In construction projects, concrete slabs (such as floor slabs and ground slabs) often need to be lifted and adjusted to restore flatness or structural function due to foundation settlement, load changes, or construction errors. Existing lifting devices mostly use simple screw-driven structures, but they generally have a key problem: the screws experience high rotational resistance and uneven stress during the lifting process, resulting in poor lifting stability.

[0003] Specifically, in existing devices, the lead screw directly contacts the support structure, resulting in high axial friction during rotation. This not only requires significant operating force but also easily leads to radial swaying due to uneven friction. Simultaneously, the insufficient precision in the fit between the lead screw and the load-bearing components makes localized stress concentrations prone to occur during the jacking force transmission, causing uneven stress on the concrete slabs. This can lead to problems ranging from minor issues like jacking process stalls and low height control accuracy to more serious issues like concrete slab cracking and device component deformation. For example, during floor jacking operations, a sudden change in the lead screw's rotational resistance can cause excessive instantaneous stress on localized slabs, resulting in surface cracks or even internal structural damage, requiring subsequent repairs and increasing construction costs and time. Furthermore, the support structures in existing devices are mostly simple supports with insufficient reliability in fixing to the concrete slabs, making them prone to relative displacement during jacking and further exacerbating the problem of unstable jacking. These defects seriously affect the efficiency, safety, and construction quality of concrete slab jacking operations, necessitating a jacking device that can solve the problems of high lead screw rotational resistance and uneven stress distribution. Utility Model Content

[0004] To address the problem of poor lifting stability caused by high rotational resistance and uneven force distribution in existing concrete slab lifting devices, the present invention aims to provide a concrete slab lifting device that optimizes structural design, reduces rotational friction of the lead screw, ensures uniform transmission of lifting force, achieves stable and precise lifting of concrete slabs, improves the fixing reliability of the device to the concrete structure, and reduces construction risks.

[0005] This application provides a concrete slab lifting device, which adopts the following technical solution: it includes a support frame for fixing to the ground or concrete structure, the support frame having expansion bolt fixing holes; a lifting screw that cooperates with the support frame to generate a lifting force; a rotary nut for driving the lifting screw to rotate; and a rotary bearing box located below the lifting screw, which contains a planar thrust bearing for supporting the rotation of the lifting screw.

[0006] Optionally, it also includes expansion bolts passing through the expansion bolt fixing holes for fixing the force-bearing frame.

[0007] Optionally, it also includes a locking nut that cooperates with the lifting screw to lock the lifting state, and a lifting nut that participates in the adjustment of the lifting force transmission.

[0008] Optionally, the rotary bearing housing is further provided with a bushing for positioning and protecting the components, and a retaining ring for fixing the bushing and preventing it from displacing or falling off.

[0009] Optionally, the top of the force-bearing frame has a cross-shaped structure and its bottom is a flat plate, and the expansion bolt fixing holes are distributed on the bottom periphery of the force-bearing frame.

[0010] In summary, this application includes the following beneficial technical effects:

[0011] 1. High lifting stability: The planar thrust bearing in the rotary bearing box can effectively withstand axial force, significantly reduce the frictional resistance when the lifting screw rotates, avoid radial sway caused by uneven friction, ensure a smooth lifting process, and reduce the risk of cracking of concrete slabs due to uneven stress.

[0012] 2. Reliable Fixation: The support frame is fixed to the concrete structure by expansion bolts, and the layout of the expansion bolt fixing holes (especially the distribution on the bottom perimeter) can disperse the fixing stress, improve the connection stability between the support frame and the concrete slab, and avoid relative displacement during the jacking process;

[0013] 3. Effortless operation: The flat thrust bearing reduces the driving force required to rotate the nut, making the lifting operation easier and improving construction efficiency;

[0014] 4. Expandable functionality: The optional locking nut can be locked after the device is lifted into place to prevent it from falling back; the bushing and retaining spring further optimize component positioning, extend the service life of the device, and adapt to the needs of different construction scenarios. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the device. Figure I ;

[0016] Figure 2 This is a schematic diagram of the overall structure of the device. Figure II ;

[0017] Figure 3 This is a top view of the device;

[0018] Figure 4 This is a cross-sectional view of the overall structure of the device. Figure I ;

[0019] Figure 5 This is a cross-sectional view of the overall structure of the device. Figure II ;

[0020] Figure 6 This is a schematic diagram of the force-bearing frame of this device;

[0021] Figure 7 For this device Figure 4 Enlarged view of A in the middle;

[0022] Among them, 1. support frame, 2. expansion bolt fixing hole, 3. lifting screw, 4. rotating nut, 5. rotating bearing box, 6. expansion bolt, 7. locking nut, 8. lifting nut, 9. bushing, 10. snap ring. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the accompanying drawings. In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model.

[0024] Reference Figure 1 , Figure 2 , Figure 5 , Figure 7 One embodiment shown is as follows: The concrete slab lifting device includes a support frame 1. In this embodiment, the support frame 1 has an overall vertically extending structure, with its lower part used for contact and connection with the ground or concrete structure; a lifting screw 3 passes through the middle of the support frame 1 in a vertical direction, and the two are connected by a threaded structure, that is, the middle of the support frame 1 has an internal threaded hole, and the external thread of the lifting screw 3 is adapted to the internal threaded hole, so that the lifting screw 3 can generate axial displacement relative to the support frame 1 when it rotates; a rotating nut 4 is sleeved on the upper part of the lifting screw 3, and... The lifting screw 3 is fixedly connected to the support frame 1 via threads. The lower end face of the rotating nut 4 contacts the upper end face of the support frame 1. When the rotating nut 4 rotates, it can drive the lifting screw 3 to rotate synchronously. The rotating bearing box 5 is located directly below the lifting screw 3. Its top is fixed to the lower end of the lifting screw 3 via a detachable connection. The planar thrust bearing is sleeved on the outer side of the lower end of the lifting screw 3 and is completely housed inside the rotating bearing box 5. The inner ring of the planar thrust bearing is fitted and fixed to the outer wall of the lifting screw 3, and the outer ring is fitted and fixed to the inner wall of the rotating bearing box 5. In the above connection relationship, the threaded fit ensures that the lifting screw 3 and the support frame 1 can generate axial force through rotation. The contact between the rotating nut 4 and the end face of the support frame 1 realizes the transmission of force. The fitted and fixed planar thrust bearing to the lifting screw 3 and the rotating bearing box 5 ensures the stability of the support.

[0025] The implementation principle is as follows: When rotating the rotating nut 4, the rotating nut 4 drives the lifting screw 3 to rotate synchronously. Since the lifting screw 3 and the support frame 1 are connected by threads, the lifting screw 3 will generate an upward axial displacement relative to the support frame 1 when it rotates. At this time, the rotating bearing box 5 serves as a support point, and the planar thrust bearing transmits the axial force of the lifting screw 3 to the rotating bearing box 5, while reducing the frictional resistance when the lifting screw 3 rotates. Finally, the lifting force is transmitted to the ground or concrete structure through the support frame 1 to realize the lifting action.

[0026] Reference Figure 1 , Figure 5 , Figure 6 One embodiment shown is as follows: The device further includes an expansion bolt 6. In this embodiment, the expansion bolt 6 passes vertically through the expansion bolt fixing hole 2 on the support frame 1. After passing through the fixing hole, the threaded portion of the expansion bolt 6 is inserted into a pre-set installation hole in the floor or concrete structure. The diameter of the head of the expansion bolt 6 is larger than the diameter of the expansion bolt fixing hole 2, and the lower end face of the head is tightly fitted with the upper end face of the support frame 1. By tightening the nut of the expansion bolt 6, the expansion end of the expansion bolt 6 expands within the installation hole, thereby fixing the support frame 1 to the floor or concrete structure as a whole. In the above connection, the cooperation between the expansion bolt 6 and the expansion bolt fixing hole 2 achieves the positioning of the support frame 1, and the expansion effect of the expansion end ensures the firmness of the connection.

[0027] The implementation principle is as follows: the expansion bolts 6 fix the support frame 1 to the foundation structure through mechanical locking, preventing relative displacement between the support frame 1 and the ground or concrete structure during the jacking process, ensuring that the jacking force can be stably transmitted, and avoiding jacking failure or structural damage caused by the loosening of the support frame 1.

[0028] Reference Figure 4 , Figure 6 One embodiment shown is as follows: The device further includes a locking nut 7 and a lifting nut 8. In this embodiment, the lifting nut 8 is sleeved on the lifting screw 3, located between the force-bearing frame 1 and the rotating bearing box 5. The lifting nut 8 and the lifting screw 3 are connected by threads, and its upper end face contacts the lower end face of the force-bearing frame 1. The locking nut 7 is sleeved on the upper part of the lifting screw 3, located above the rotating nut 4. The locking nut 7 and the lifting screw 3 are connected by threads, and its lower end face is tightly fitted with the upper end face of the rotating nut 4. The contact between the lifting nut 8 and the force-bearing frame 1 enables the auxiliary transmission of the lifting force, while the fit between the locking nut 7 and the rotating nut 4 achieves the locking function through friction.

[0029] The implementation principle is as follows: During the lifting process, the lifting nut 8 can be rotated to adjust the contact tightness with the support frame 1, which helps to disperse the lifting force and avoid excessive local stress on the support frame 1; when the lifting is in place, tighten the locking nut 7 to press it tightly against the rotating nut 4, and use the friction between the two to restrict the reverse rotation of the rotating nut 4 and the lifting screw 3, thereby locking the lifting height and preventing the concrete slab from falling back.

[0030] Reference Figure 7 One embodiment shown is as follows: The rotary bearing housing 5 also includes a bushing 9 and a retaining spring 10. In this embodiment, the bushing 9 is an annular structure, fitted onto the outside of the lifting screw 3, located above the planar thrust bearing. The inner wall of the bushing 9 is in contact with the outer wall of the lifting screw 3, and the outer wall is in contact with the inner wall of the rotary bearing housing 5. The lower end face of the bushing 9 contacts the upper end face of the planar thrust bearing. An annular groove is provided on the inner wall of the rotary bearing housing 5, and the retaining spring 10 is installed in this groove, pressing the bushing 9 tightly onto the planar thrust bearing. The fit between the bushing 9 and the lifting screw 3 and the rotary bearing housing 5 achieves positioning and protection, while the cooperation between the retaining spring 10, the groove, and the bushing 9 achieves a fixing function.

[0031] The implementation principle is as follows: the bushing 9 provides radial positioning for the planar thrust bearing and the lifting screw 3, preventing them from shifting during rotation and protecting the bearing from external impurities; the snap ring 10 is fixed in the rotary bearing housing 5 through the snap ring groove, pressing the bushing 9 tightly to prevent the bushing 9 from shifting upward due to vibration or axial force during the operation of the device, thus ensuring the stable assembly of the internal components of the rotary bearing housing 5.

[0032] Reference Figure 1 , Figure 3 One embodiment shown is as follows: the top of the force-bearing frame 1 is a cross-shaped structure, and the bottom is a flat plate. In this embodiment, the top cross-shaped structure of the force-bearing frame 1 is located above the bottom flat plate structure, and the two are integrally formed. The center of the cross-shaped structure and the center of the bottom flat plate structure are on the same vertical line. Expansion bolt fixing holes 2 are evenly distributed on the periphery of the edge of the bottom flat plate structure. Each expansion bolt fixing hole 2 penetrates the upper and lower surfaces of the flat plate structure and is horizontally offset from the end of the cross-shaped structure. The integral forming of the cross-shaped structure and the flat plate structure ensures the overall strength, and the periphery distribution of the expansion bolt fixing holes 2 makes the force distribution more uniform.

[0033] The implementation principle is as follows: the top cross-shaped structure saves more material than the overall flat structure, while providing a stable support platform for the rotating nut 4 and the lifting screw 3. The through hole in the center can be precisely matched with the lifting screw 3. The bottom flat structure increases the contact area with the ground or concrete structure. Combined with the expansion bolt fixing holes 2 distributed around the perimeter, the fixing force of the expansion bolts 6 is evenly distributed at the bottom of the support frame 1, avoiding excessive local stress that could cause deformation of the support frame 1 and improving overall stability.

[0034] The working principle of this device is as follows: First, the support frame 1 is fixed to the concrete slab to be lifted using expansion bolts 6 through the expansion bolt fixing holes 2 on the bottom periphery. Rotating the rotating nut 4 causes the lifting screw 3 to rotate. Because the lifting screw 3 and the support frame 1 are threaded together, the screw undergoes an upward axial displacement relative to the support frame 1. The rotating bearing box 5 is located below the screw, and its internal planar thrust bearing reduces rotational friction while transmitting axial force. During the lifting process, the lifting nut 8 helps to disperse the force, preventing uneven force distribution on the support frame 1. After reaching the desired position, the locking nut 7 is tightened to lock the height. The bushing 9 and retaining spring 10 inside the rotating bearing box 5 ensure the stability of the components. Finally, the force is transmitted to the concrete slab through the support frame 1, achieving smooth lifting.

[0035] The working principle of this device has been explained through the above embodiments. These embodiments only illustrate several implementation methods of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A concrete slab lifting device, characterized in that: Includes a support frame (1) for fixing to the ground or concrete structure, the support frame (1) having expansion bolt fixing holes (2); a lifting screw (3) cooperating with the support frame (1) for generating a lifting force; a rotary nut (4) for driving the lifting screw (3) to rotate; and a rotary bearing box (5) located below the lifting screw (3) and containing a planar thrust bearing for supporting the rotation of the lifting screw (3).

2. The concrete slab lifting device according to claim 1, characterized in that: It also includes expansion bolts (6) passing through the expansion bolt fixing hole (2) for fixing the support frame (1).

3. A concrete slab lifting device according to claim 2, characterized in that: It also includes a locking nut (7) that works with the lifting screw (3) to lock the lifting state, and a lifting nut (8) that participates in the adjustment of the lifting force transmission.

4. A concrete slab lifting device according to claim 3, characterized in that: Inside the rotary bearing housing (5), there is also a bushing (9) for positioning and protecting the component, and a retaining ring (10) for fixing the bushing (9) and preventing it from displacing and falling off.

5. A concrete slab lifting device according to claim 4, characterized in that: The top of the support frame (1) is a cross-shaped structure and the bottom is a flat plate. The expansion bolt fixing holes (2) are distributed on the bottom periphery of the support frame (1).

Images