Auxiliary Device and Method for Recovering Forepoling Grouted-Steel Pipe Piles Used in Foundation Pit Support

TECHNICAL FIELD

[0001]The invention pertains to the technical field of foundation pit support, and discloses an auxiliary recovery device and method for forepoling grouted steel pipe piles.

BACKGROUND

[0002]Foundation pit support is a critical component of foundation pit engineering, and its overall construction quality is paramount. Typically, foundation pit support structures are temporary; excessive investment may lead to unnecessary waste, while inadequate support can easily trigger engineering accidents, resulting in severe consequences such as casualties and damage to adjacent buildings. Therefore, selecting a safe, rational, and economical foundation pit support solution is essential.

[0003]The forepoling grouted steel pipe pile support system significantly enhances construction efficiency in foundation pit projects. By employing this system during construction, deformation and collapse risks during earth excavation are reduced, improving both safety and stability. Due to its increased efficiency and reduced construction risks, it saves labor and material resources, thereby lowering overall costs. Compared to conventional methods, it consumes far less reinforcement and concrete, eliminates secondary noise and dust pollution from support removal, and delivers notable green benefits with significant comprehensive social advantages. In contrast to traditional horizontal bracing, this technique reduces construction difficulty, improves efficiency, shortens schedules, cuts costs, and serves as a valuable reference for similar support technologies.

[0004]In existing construction cases, forepoling grouted steel pipe piles are typically cut once the foundation pit reaches design strength. This method only recovers the above-slab portion of the steel pipes, leaving the majority of the below-slab section unrecovered, resulting in material waste and higher costs. Thus, there is a pressing need for an auxiliary recovery device and method for forepoling grouted steel pipe piles, which would contribute positively to low-carbon emission reduction and environmentally friendly construction practices.

SUMMARY

[0010]Further, the main plane is mounted on a reaction fork fixed to the ground where the piles are installed.

[0011]Further, the clamping hydraulic shafts are slidably fitted with guide rods on their sides, with the rods'ends fixedly connected to the clamps.

[0012]Further, the device includes a lower plane, with the upper plane, lower plane and main plane arranged vertically in sequence. The lower plane is top-connected to a connecting shaft that penetrates the upper plane and is secured with a nut, with a buffer spring sleeved on the connecting shaft.

[0013]Further, four lifting hydraulic shafts are provided, each positioned directly below a corresponding clamping hydraulic shaft.

BRIEF DESCRIPTION OF DRAWINGS

[0025]FIG. 1 shows the overall structural diagram of the auxiliary recovery device for forepoling grouted steel pipe piles proposed in the present invention

[0026]FIG. 2 presents the workflow diagram of the recovery method for forepoling grouted steel pipe piles proposed in the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS

[0027]The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to FIGS. 1-2. It should be noted that the described embodiments represent only a part of the invention's embodiments, rather than all of them. Unless otherwise specified, the technical means used in the embodiments are conventional methods well-known to those skilled in the art.

Embodiment 1

[0028]Please refer to FIG. 1, FIG. 1 is an auxiliary recovery device for forepoling grouted steel pipe piles comprises: Clamps (1), Clamping hydraulic shafts (2), Upper plane (4), Lifting hydraulic shafts (10), and Main plane (13).

[0029]The clamping hydraulic shafts (2) are mounted on the upper plane (4), with four shafts arranged in a cross-shaped configuration, all with inward-facing output ends. Each output end of the clamping hydraulic shafts (2) is fixedly connected to a clamp (1).

[0030]The lifting hydraulic shafts (10) are installed on the main plane (13), with their output ends connected to the upper plane (4).

[0031]Both the upper plane (4) and the main plane (13) are equipped with circular holes adapted to the forepoling grouted steel pipe piles. These planes are designed to sleeve onto the forepoling grouted steel pipe piles, enabling the clamping hydraulic shafts (2) to drive the clamps (1) to grip the piles, while the lifting hydraulic shafts (10) facilitate their extraction.

[0032]Further, the main plane (13) is mounted on a reaction fork, which is fixed to the ground where the forepoling grouted steel pipe piles are installed.

[0033]Additionally, the clamping hydraulic shafts (2) are slidably fitted with guide rods (3) on their sides, with the ends of the guide rods (3) fixedly connected to the clamps (1).

[0034]The device also includes a lower plane (7), arranged sequentially from top to bottom with the upper plane (4) and main plane (13). The lower plane (7) is fixedly connected at its top to a connecting shaft (5), which passes through the upper plane (4) and is secured with a nut. A buffer spring (6) is sleeved on the connecting shaft (5). Both the upper plane (4) and lower plane (7) are equipped with coaxial circular holes of identical size.

[0035]Moreover, four lifting hydraulic shafts (10) are provided, each positioned directly below a corresponding clamping hydraulic shaft (2).

[0036]The main plane (13) is connected to the reaction fork via a first pin (12) and a second pin (15), located on either side of the main plane (13). The main plane (13) also features a fixing hole (16) for ground anchorage, along with a counterweight frame (9) and a hydraulic control unit (8). The hydraulic control unit (8) regulates the clamping hydraulic shafts (2) and lifting hydraulic shafts (10).

Embodiment 2

[0045]Repeat Steps 6-7 until all sections of the forepoling grouted steel pipe piles are recovered.

[0046]The recovery device and method of this invention significantly improve the recycling rate of forepoling grouted steel pipe piles, drastically reducing construction costs. This innovation not only enhances economic efficiency but also actively promotes low-carbon emission reduction in construction, contributing to environmental protection and sustainable development.

[0047]The described embodiments represent only preferred implementations of the invention. Without departing from its spirit, any modifications, variations, or substitutions made by those skilled in the art shall fall within the protection scope defined by the claims.