Device for preventing steel casing from falling in pile foundation construction
By using a steel fixing base and a wedge-shaped limiting slide plate with a return spring in pile foundation construction, the problem of steel casing falling is prevented, thus ensuring the safety and progress of construction.
Patent Information
- Application Number
- CN202520833434.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-04-29
AI Technical Summary
In existing technologies, steel casings are prone to falling during pile foundation construction due to operational errors or equipment failures, resulting in high rescue costs and delays in the construction period.
A device for preventing steel casing from falling is adopted, including a steel fixed base, a wedge-shaped limiting slide, a pin support and a return spring. The wedge-shaped limiting slide is in close contact with the steel casing, and the pulling action of the return spring is used to prevent the steel casing from falling.
Under harsh construction conditions, the device has a simple structure, high strength, and light weight, which prevents the steel casing from falling, avoids high rescue costs, and ensures that the construction progress is not affected.
Smart Images
Figure CN223824164U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of geotechnical engineering cast-in-place pile construction, specifically to a device for preventing the steel casing from falling during pile foundation construction. Background Technology
[0002] Cast-in-place piles, as a classic type of pile foundation structure, are widely used in many fields such as municipal engineering and residential construction. Traditional mud-wall drilling technology is suitable for cohesive soils and silt with high groundwater levels; however, it often suffers from quality problems such as borehole wall collapse, necking, excessive sediment buildup, pile breakage, and grout leakage, limiting its application in areas with extremely high pile quality requirements. To address pile foundation construction under complex geological conditions (such as collapsible loess and silt) and prevent numerous quality problems, the full casing follow-up technology has emerged, significantly improving pile quality. This technology includes key processes such as rotating and pressing the casing into the soil, connecting the next casing section by section, drilling and cleaning the borehole, and simultaneously pouring and lifting the casing. During the section-by-section lifting and dismantling of the casing, worker errors, loose connecting bolts, or equipment malfunctions often cause the casing to detach at the borehole opening and fall tens of meters into the pile hole, resulting in high rescue costs and project delays. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a device to prevent the steel casing from falling during pile foundation construction in order to make up for the deficiencies in the existing technology. The device has a simple structure, small footprint, good integrity and high reliability.
[0004] The technical solution adopted by this utility model to solve its technical problem is: a device for preventing steel casing from falling during pile foundation construction, including a steel fixed base, a wedge-shaped limiting slide, a pin support and a return spring. The steel fixed base has a cavity in the center for placing the steel casing. There are four sets of pin supports, which are fixedly installed at the center of the top four sides of the steel fixed base. There are four sets of wedge-shaped limiting slides. One end of the bottom of each set of wedge-shaped limiting slides is hinged to the pin support, and the other end is connected to the top of the steel fixed base through a return spring.
[0005] Furthermore, the steel fixing base is composed of four I-beams of equal length, with a square structure at the top.
[0006] Furthermore, stiffening ribs are welded to both sides of the middle of each side of the I-beam of the steel fixing base to improve the rigidity of the device.
[0007] Furthermore, the front end of the wedge-shaped limiting plate is a wedge-shaped arc, and the wedge-shaped arc and end face are engraved with locking teeth, which are shaped at an upward angle.
[0008] Furthermore, the rear end of the wedge-shaped limiting slide plate is provided with an operating handle.
[0009] Furthermore, the wedge-shaped limiting slide plate has a circular hole in the middle to facilitate hoisting.
[0010] Furthermore, the upper end of the reset spring is welded to the bottom of the wedge-shaped limiting slide plate, and the lower end is connected to the crossbar base set on the top of the steel fixed base via a hook.
[0011] Furthermore, the crossbar base consists of support plates on both sides and a connecting crossbar in the middle, with the support plates on both sides welded to the top of the steel fixed base.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] This device is designed to prevent the steel casing from falling into the pile hole during the section-by-section removal process in pile foundation construction using the full casing follow-up technique. Its overall structure is simple, high-strength, lightweight, easy to transport, and occupies little space. Even under harsh construction conditions filled with mud and murky water, it maintains excellent performance. With the help of a return spring, the wedge-shaped limiting plate contacts the casing and begins its anti-fall function without manual intervention. As the weight of the casing increases, the contact between the wedge-shaped limiting plate and the casing becomes even tighter, ensuring that it will not fall during the section-by-section removal process. This not only avoids high rescue costs but also ensures that the construction progress is not affected. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;
[0015] Figure 2 for Figure 1 A partial structural diagram of the embodiment shown;
[0016] Figure 3 for Figure 1 A schematic diagram of the anti-fall mechanism of the steel casing in the embodiment shown.
[0017] Figure 4 for Figure 1 A schematic diagram of the structure during the lifting of the steel casing in the embodiment shown;
[0018] Explanation of the reference numerals in the figure:
[0019] 1. Steel fixed base, 2. Wedge-shaped limiting plate, 3. Pin support, 4. Return spring, 5. Crossbar base, 6. Stiffening rib, 7. Clamping teeth, 8. Operating handle, 9. Steel protective sleeve. Detailed Implementation
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0021] Reference Figures 1 to 4 This embodiment provides a device to prevent steel casing from falling during pile foundation construction, including a steel fixing base 1, a wedge-shaped limiting slide plate 2, a pin support 3, and a return spring 4. The steel fixing base 1 has a cavity in the center for placing the steel casing. There are four sets of pin supports 3, which are fixedly installed at the center of the top four sides of the steel fixing base 1. There are four sets of wedge-shaped limiting slide plates 2. One end of the bottom of each set of wedge-shaped limiting slide plates 2 is hinged to the pin support 3, and the other end is connected to the top of the steel fixing base 1 through the return spring 4.
[0022] In this embodiment, the steel fixing base 1 is composed of four I-beams of equal length, and the top is a square structure.
[0023] In this embodiment, stiffening ribs 6 are welded to the middle of the two sides of each side of the I-beam of the steel fixing base 1 to improve the rigidity of the device.
[0024] In this embodiment, the front end of the wedge-shaped limiting plate 2 is a wedge-shaped arc, and the wedge-shaped arc and the end face are engraved with locking teeth 7, which are shaped to be obliquely upward.
[0025] In this embodiment, the rear end of the wedge-shaped limiting slide plate 2 is provided with an operating handle 8.
[0026] In this embodiment, the wedge-shaped limiting slide plate 2 has a circular hole in the middle to facilitate hoisting.
[0027] In this embodiment, the upper end of the return spring 4 is welded to the bottom of the wedge-shaped limiting slide plate 2, and the lower end is connected to the crossbar base 5 set on the top of the steel fixing base via a hook. The crossbar base 5 consists of support plates on both sides and a connecting crossbar in the middle, and the support plates on both sides are welded to the top of the steel fixing base.
[0028] During construction, the steel casing 9 is placed at the center of the steel fixed base 1 and is in contact with the wedge-shaped limiting plate 2.
[0029] How to use:
[0030] Before installation, the site is leveled, the center position of the steel casing 9 is measured and located, and mechanical equipment is used to rotate and insert the steel casing 9 into the soil. At the same time, construction machinery excavates soil inside the steel casing 9, connecting the steel casing 9 section by section and pressing it down until the design pile bottom elevation is reached. The entire device is then hoisted and nested within the steel casing 9, with the steel casing 9 concentric with the center of the device, and the device is leveled. During the hoisting and placement of the device, due to the pulling action of the return spring 4, when the device is placed on the top of the steel casing 9, the arc-shaped locking teeth 7 of the wedge-shaped limiting plate 2 will make tight contact with the steel casing 9. If the steel casing 9 falls during the lifting process due to improper operation, the wedge-shaped limiting plate 2 will rotate inward around the pin support 3, and the steel casing 9 will fall. Under the weight of the casing 9, the wedge-shaped limiting slide plate 2 will have a tighter contact with the steel casing 9, and the upward-sloping locking teeth 7 will be subjected to increased force, thus preventing the steel casing 9 from falling. During normal lifting, the wedge-shaped limiting slide plate 2 maintains tight contact with the steel casing 9, and the wedge-shaped limiting slide plate 2 rotates outward around the pin support 3 without generating additional resistance. When the wedge-shaped limiting slide plate 2 rotates, the return spring 4 is stretched or compressed and deformed accordingly, and the hook of the return spring 4 rotates slightly around the crossbar base 5 to adapt to the structural changes. When temporary separation is required, the operating handle 8 can be turned to separate the wedge-shaped limiting slide plate 2 from the steel casing 9. This process continues until all the steel casings 9 are lifted out of the pile hole section by section, and finally the pile foundation is poured and formed.
[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A device for preventing the steel casing from falling during pile foundation construction, characterized in that: The device includes a steel fixing base, wedge-shaped limiting slides, pin supports, and a return spring. The steel fixing base has a cavity at its center for placing a steel casing. There are four sets of pin supports, which are fixedly installed at the center of the four sides of the top of the steel fixing base. There are four sets of wedge-shaped limiting slides. One end of the bottom of each set of wedge-shaped limiting slides is hinged to the pin support, and the other end is connected to the top of the steel fixing base through a return spring.
2. The device for preventing steel casing from falling during pile foundation construction according to claim 1, characterized in that: The steel fixing base is composed of four I-beams of equal length, with a square structure on top.
3. The device for preventing steel casing from falling during pile foundation construction according to claim 2, characterized in that: The steel fixing base has stiffening ribs welded to both sides of the middle of each side of the I-beam.
4. The device for preventing steel casing from falling during pile foundation construction according to claim 1 or 2, characterized in that: The front end of the wedge-shaped limiting plate is a wedge-shaped arc, and the wedge-shaped arc and end face are engraved with locking teeth, which are shaped at an upward angle.
5. The device for preventing steel casing from falling during pile foundation construction according to claim 1 or 2, characterized in that: The wedge-shaped limiting plate is equipped with an operating handle at its rear end.
6. The device for preventing steel casing from falling during pile foundation construction according to claim 1 or 2, characterized in that: The wedge-shaped limiting plate has a circular hole in the middle.
7. The device for preventing steel casing from falling during pile foundation construction according to claim 1 or 2, characterized in that: The upper end of the reset spring is welded to the bottom of the wedge-shaped limiting plate, and the lower end is connected to the crossbar base set on the top of the steel fixed base through a hook.
8. The device for preventing steel casing from falling during pile foundation construction according to claim 7, characterized in that: The crossbar base consists of support plates on both sides and a connecting crossbar in the middle. The support plates on both sides are welded to the top of the steel fixed base.