Cast-in-place pile safety pile casing convenient to construct

Abstract

The utility model discloses a cast-in-place pile safety pile casing convenient to construct. The cast-in-place pile safety pile casing is used for solving the problems that an existing steel pile casing inclines and sinks in a pile hole. The cast-in-place pile safety pile casing comprises a steel pile casing body and a concrete cone, the steel pile casing body is a steel pile casing with equal wall thickness and equal diameter, and the concrete cone is fixedly attached to the outer side of the upper section of the steel pile casing body. The concrete cone is additionally arranged at the top of the steel casing, so that an expanded structure is formed at the top of the steel casing, the expanded structure effectively increases the resistance of the steel casing in the falling process, and continuous sinking of the steel casing after the steel casing is lowered in place is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation and pile hole construction technology. Background Technology

[0002] Taking over-grown pile construction as an example, steel casings are required for safety protection of the pile hole section. Currently, the steel casings used are basically made of 10mm thick steel plates, with the casing diameter (outer diameter) slightly larger than the pile hole diameter (inner diameter). Furthermore, to facilitate the removal of the steel casing after construction, both the inner and outer surfaces of the casing are smooth. While this smooth design facilitates the lowering and removal of the casing, it also increases its instability. For example, after the casing is lowered into place, it may tilt or sink during later use due to external impacts or vibrations. This instability is undesirable during construction. Currently, no new anti-sinking or anti-tilting steel casings have been developed to address this technical problem. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a safety shield for cast-in-place piles that is easy to construct, thereby solving the problems of tilting and sinking of existing steel casings in pile holes.

[0004] To address the problems in the background technology, the common approach is to weld spiral ribs around the steel casing. By setting up the ribs, the gripping force with the soil layer in the pile hole is enhanced, thereby solving the problems of tilting and sinking. However, this structure cannot meet the requirements for lowering the steel casing with the pile hammer. Therefore, a new approach is needed to solve this technical problem.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] A safety casing for cast-in-place piles that facilitates construction is characterized by comprising a steel casing body and a concrete cone, wherein the steel casing body is a steel casing with uniform wall thickness and uniform diameter, and the concrete cone is attached and fixed to the outer side of the upper section of the steel casing body.

[0007] Furthermore, the concrete is steel fiber reinforced concrete.

[0008] Furthermore, a steel shell is provided around the concrete cone, and the steel shell is welded and fixed to the steel casing body.

[0009] Furthermore, the inner surface of the steel casing body is provided with a heating resistance wire and a polyethylene coating, and the electrode terminals of the heating resistance wire are led out to the outside of the steel casing body.

[0010] Furthermore, a reinforcing hoop is provided around the lower periphery of the steel casing body.

[0011] Furthermore, the concrete cone covers the upper 2-meter section of the steel casing body.

[0012] Furthermore, spiral steel ribs are welded to the outer surface of the steel casing body corresponding to the concrete cone, and the spiral steel ribs are fitted into the concrete cone.

[0013] Furthermore, an embedded part is provided at the top of the concrete cone, and a bull's nose ring is provided in the embedded part, and the fall protection net is fixedly connected to the bull's nose ring.

[0014] The beneficial effects of this utility model are:

[0015] This invention adds a concrete cone to the top of the steel casing, creating an enlarged structure at the top. This enlarged structure effectively increases the resistance of the steel casing during its descent, effectively preventing continuous sinking after it is placed in position. This solves the technical problem and achieves the technical design goal.

[0016] This invention further enhances safety during construction by installing a fall-prevention net at the top of the casing, preventing injuries and fatalities from accidental falls. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention.

[0018] Figure 2 This is a cross-sectional view of the safety casing.

[0019] Figure 3 This is a diagram showing the usage state of this utility model in a pile hole.

[0020] Figure 4 This is a structural diagram of Example 2.

[0021] In the picture:

[0022] 00 soil layer,

[0023] 100 steel casing body, 110 spiral steel ribs, 120 reinforcing hoops, 130 conical steel shell.

[0024] 200 concrete cone, 210 bull's nose ring, 220 fall protection net.

[0025] 300 inner protective layer, 310 electrode terminals. Detailed Implementation

[0026] The safety casing for cast-in-place piles is easy to construct. In this embodiment, "easy to construct" means that it is easy to lower and retrieve the casing. Both are indispensable.

[0027] Example 1

[0028] This embodiment is described in conjunction with the appendix to the instruction manual. Figure 1 To be continued Figure 3 To elaborate further, the casing is a novel structure made of composite materials, rather than a traditional steel structure.

[0029] A novel structure includes a steel casing body 100, an outer concrete cone 200, and an inner protective layer 300. The steel casing body 100 is a large-diameter steel casing with a diameter of 3 meters, rolled from top to bottom from a 10mm thick steel plate. Its length is 8 meters. The steel casing has a uniform diameter design, and spiral steel ribs 110 are welded to the upper 2-meter section of the casing body, forming a spiral reinforcement. A molding template is then set around the steel casing where the spiral steel ribs are located, and steel fiber reinforced concrete is poured, compacted, and cured. The molding template is conical in shape. After demolding, a conical concrete cone 200 is formed at the top of the steel casing body, surrounding the upper section of the steel casing to form the conical part. The presence of this concrete cone ensures a wedge-shaped fit between the concrete cone 200 and the soil layer 00 after the steel casing is lowered, preventing the steel casing from continuously sinking and thus solving the sinking problem. Furthermore, the larger diameter of the concrete cone, combined with the steel casing, forms a rivet-like structure, providing greater anchoring effect and thus better stability.

[0030] Furthermore, an embedded part is provided at the top of the aforementioned concrete cone 200, and a bullnose ring 210 is provided in the embedded part for hooking during hoisting. Simultaneously, this bullnose ring also serves as a fixing point for the fall arrest net, as described above. Figure 1 A fall protection net 220 can be installed at this location to prevent construction workers from falling.

[0031] Furthermore, a heating resistance wire and a polyethylene coating are pre-laid on the inner surface of the steel casing body to form the aforementioned inner protective layer 300. The polyethylene coating fixes the heating resistance wire, and the electrode terminals 310 of the heating resistance wire are led out to the outside of the steel casing body for later use. Under normal operating conditions, without power to the heating resistance wire, the polyethylene coating can be firmly adhered to the outside of the steel casing body. The presence of this polyethylene coating can improve the impact resistance of the inner wall of the steel casing, which is of positive significance for the smooth drilling operation of the drilling equipment.

[0032] Furthermore, after construction is completed, the casing is removed using pile extraction equipment. Then, the heating resistance wire is energized. The heating resistance wire heats up, and the polyethylene coating softens, allowing for quick removal of the polyethylene coating. In other words, this method allows for rapid replacement of the polyethylene coating and the heating resistance wire, achieving the goal of replacing them once a week, ensuring that the casing is always in optimal condition.

[0033] It should be noted that the heating resistance wire and polyethylene coating mentioned above are optional configurations and can be replaced by general anti-corrosion coatings, all of which are within the protection scope of this utility model.

[0034] Furthermore, a reinforcing hoop 120 is provided on the lower periphery of the aforementioned steel casing body 100 to solve the problem of stress concentration at the bottom of the steel casing causing local deformation when the steel casing is lowered.

[0035] Example 2

[0036] refer to Figure 4 The difference between this embodiment and embodiment one is that this embodiment replaces steel fiber reinforced concrete with ordinary concrete. The replaced concrete is prone to cracking or even falling off due to impacts during use and turnover. The solution is to weld a conical steel shell 130 within the upper 2-meter range of the steel casing body. The conical steel shell wraps around the concrete cone 200, that is, a steel shell is formed on the outside of the concrete cone 200, which can effectively solve the cracking problem caused by impacts.

[0037] The molding process of this embodiment is as follows: first, a conical steel shell is welded around the outer perimeter of the steel casing body; then, reinforced concrete is poured inside, and the concrete is cured by cement to harden. This structure achieves the same technical effect as Embodiment 1 through the combination of steel shell and ordinary concrete, and this implementation method also falls within the protection scope of this utility model.

[0038] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Without departing from the spirit of the present utility model, all modifications and improvements to the present utility model by those skilled in the art should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A safety casing for a cast-in-place pile which is easy to install, characterized in that, The steel casing body is an equal-wall-thickness and equal-diameter steel casing, and a concrete cone is fixedly attached to the outer side of the upper section of the steel casing body, the outer surface of the steel casing body corresponding to the concrete cone is welded with spiral steel ribs, the spiral steel ribs are embedded with the concrete cone, and a steel shell is arranged on the periphery of the concrete cone and is welded and fixed with the steel casing body.

2. The construction-convenient cast-in-place pile safety casing according to claim 1, characterized by, The concrete is steel fiber reinforced concrete.

3. The construction-convenient cast-in-place pile safety casing according to claim 2, characterized in that, The inner surface of the steel casing body is provided with heating resistance wires and polyethylene coating, and the electrode terminals of the heating resistance wires are led out to the outside of the steel casing body.

4. The construction-convenient cast-in-place pile safety casing according to claim 2, characterized by, A reinforcing hoop is arranged on the periphery of the lower end of the steel casing body.

5. The construction-convenient cast-in-place pile safety casing according to claim 1, characterized by, The concrete cone covers the upper section of the steel casing body within a range of 2 meters.

6. The construction-easy cast-in-place pile safety casing according to claim 1, characterized in that, The top of the concrete cone is provided with a pre-embedded part, and a bull nose ring is arranged in the pre-embedded part ， The anti-falling net is fixedly connected with the bull nose ring.

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