CN-121992771-A - Screw motor driven unfolding fluke anti-floating steel pipe pile structure of existing underground structure and construction method

Abstract

The invention discloses an existing underground structure screw motor driven unfolding fluke anti-floating steel pipe pile structure and a construction method. The steel pipe pile comprises a steel pipe pile body, an end opening, a low-clearance small-equipment anchor rod static pressure pile machine, 4-6 anchoring steel bars welded at the top of the steel pipe pile body, and a bottom plate uniformly distributed along the steel pipe pile and anchored in an underground structure. When the invention is implemented, the space adaptability is extremely strong, the whole process adopts the anchor rod static pressure pile machine with low clearance for construction, the core device is compact in volume and completely adapts to the construction environment with limited clearance of the existing underground structure, the problem that the conventional high-large equipment cannot be constructed is solved, the anti-pulling bearing capacity is greatly improved, the design of 'pushing a screw motor to drive a fluke to be unfolded' is realized, the force transmission is direct, the unfolding force is large, a double anti-pulling mechanism is formed after the fluke is embedded into a soil body, the anti-pulling bearing capacity is remarkably improved compared with the traditional steel pipe pile, and the high anti-floating requirement can be met.

Inventors

• YANG CHUNYING
• JIANG XIANFENG
• TIAN MING
• YANG DONGXUE
• LI WENXIAN
• WANG WEIXIAN
• DING XICHEN
• ZHANG RUINAN
• QUAN YU

Assignees

• 北京市地质工程勘察院有限责任公司

Dates

Publication Date

20260508

Application Date

20260331

Claims (5)

1. 1. The existing underground structure screw motor-driven unfolding fluke anti-floating steel pipe pile structure is characterized by comprising a steel pipe pile main body (6), a screw motor driving device, a pushing transmission assembly and a fluke structure (8); The steel pipe pile comprises a steel pipe pile main body (6), an end opening, a low-clearance small equipment anchor rod static pressure pile machine, 4-6 anchor bars (62) welded at the top of the steel pipe pile main body (6), and a bottom plate (7) uniformly distributed along the steel pipe pile main body (6) and anchored in an underground structure, wherein the anchoring length is not less than 39d; The screw motor driving device comprises a motor main body (1), a motor cable (11), a screw (2) and a ball nut (3); The pushing transmission assembly consists of a screw rod and pushing rod connecting piece (4) and a pushing rod (5), wherein the end part of the pushing rod (5) is conical to form a guide head, so that the soil layer can be conveniently cut, the screw rod (2) and pushing rod (5) connecting piece consists of three base plates I (41), base plates II (42), base plates III (45), locking nuts (43) and screw rod driving devices and pushing rod connecting rods 44, the aperture of the base plates I (41) is larger than the diameter of the screw rod (2), the aperture of the base plates II (42) is larger than the outer diameter of the ball nuts, the aperture of the base plates III (45) is equal to the diameter of the pushing rod (5), and clamping piece anchor plates are formed through clamping pieces (46); The single section length of the push rod (5) is consistent with that of the steel pipe pile main bodies (6), the connection of the pile sections of the steel pipe pile main bodies (6) is welded by adopting angle steel grooves, and the push rod (5) is welded; The anchor claw structure (8) is of a five-claw symmetrical structure and comprises a pin lug plate (83) welded on the wall of the steel pipe pile main body (6), a five-hole pin seat (82) connected to the push rod (5), a first connecting rod (84) and a second connecting rod (85), the five-hole pin seat (82) and the push rod (5) are clamped through anchor claw structure clamping pieces (81), the anchor claw structure clamping pieces (81) are of a slotted structure, and the anchor claw is driven to be unfolded through pushing of the motor main body (1).
2. 2. The screw motor driven expansion fluke anti-floating steel pipe pile structure of the existing underground structure according to claim 1, characterized in that the anchoring steel bars (62) of the steel pipe pile body (6) are finally anchored into the underground structure bottom plate (7).
3. 3. The screw motor driven expansion fluke anti-floating steel pipe pile structure of the existing underground structure according to claim 1, wherein a high-strength pin shaft is adopted between a first connecting rod (84) and a second connecting rod (85) of the fluke structure (8), and lubricating grease is smeared on the surface of the pin shaft.
4. 4. The screw motor driven expansion fluke anti-floating steel pipe pile structure of the existing underground structure according to claim 1, characterized in that the screw motor driving device is equipped with an overload protection module, when the fluke structure (8) expands and encounters extreme resistance, the motor main body (1) automatically stops.
5. 5. A construction method for performing anti-floating reinforcement of an existing underground structure by adopting the anti-floating steel pipe pile structure according to any one of claims 1 to 4, comprising the following steps: Firstly, preparing construction, namely detecting parameters of a bottom plate (7) of an existing underground structure, finding out engineering geology and hydrogeology conditions, determining construction parameters, preparing low-clearance construction equipment and materials, and testing at least 3 piles, wherein a dewatering well is arranged during the construction of the steel pipe pile, such as the higher water level, so as to ensure the construction effect of the steel pipe pile; Step two, perforating the bottom plate of the existing structure, positioning the perforating according to design, wherein the aperture is not more than 400mm; sinking the steel pipe pile body (6), sinking the steel pipe pile body (6) with the push rod (5) section by adopting an anchor rod static pressure pile machine, and welding and fixing to ensure that the designed soil depth is achieved; step four, installing a screw motor driving device and a pushing transmission assembly to ensure the connection and the smooth force transmission; Starting a screw motor driving device (1), pushing a pushing rod (5) to move downwards, driving a fluke to be unfolded and embedded into a peripheral soil body, and forming a double anti-pulling structure of pile body side friction resistance and fluke anchoring force; step six, disassembling the lead screw motor driving device and the connecting rod core component, cleaning, transferring to the next steel pipe pile for construction, and recycling; and seventh, casting C30 concrete filling cores for the steel pipe piles in sections, detecting the pulling-resistant bearing capacity and the construction quality of the steel pipe piles, ensuring that the design requirements are met, and sealing the piles by adopting C35 concrete after the strength reaches the standard.

Description

Screw motor driven unfolding fluke anti-floating steel pipe pile structure of existing underground structure and construction method Technical Field The invention relates to the technical field of existing underground structure anti-floating reinforcement engineering, in particular to an existing underground structure screw motor driven expansion fluke anti-floating steel pipe pile structure and a construction method. Background Along with the comprehensive implementation of the policies of south-to-north regulation and underground water pressure mining and the increase of extreme rainfall and continuous rainfall in the whole country, the situation that the underground water level continuously rises in various areas in the south and the north is presented. A large number of existing underground structures (such as underground garages, underground rail transit projects, electric power projects and the like) are caused by rising of underground water levels, so that the structures exceed the original design anti-floating capacity, the risk of floating damage is faced, and the safety and normal use of the structures are affected. The anti-floating pile is used as a core technical means for solving the anti-floating problem of the underground structure, and the stability of the structure is ensured by the side friction resistance of the pile body and the soil body and the end bearing force of the pile bottom bearing layer to resist the buoyancy of underground water. The anti-floating reinforcement is carried out on the existing structure, the anti-floating pile has remarkable advantages in the aspect of providing strong and stable pulling resistance, but the existing underground structure has limited clearance, the selection of construction machinery is severely limited, such as the equipment height of the conventional bored pile is large, and the general existing space is difficult to meet the construction requirement. Therefore, the anti-floating reinforcement of the existing structure should preferably be low-clearance fit, small equipment construction and anti-floating pile type with small disturbance to the structure and the periphery. In the existing anti-floating reinforcement technology, the anchor rod static pressure steel pipe pile is a preferable type of the existing underground structure anti-floating reinforcement because of short length of a single pile, low equipment height requirement, small construction vibration and low noise, but has a plurality of defects that on one hand, the anti-pulling bearing capacity of the traditional steel pipe pile mainly depends on the side friction resistance of a pile body and a soil body, the requirement is difficult to meet under a weak stratum or a high anti-floating requirement scene, and if the bearing capacity is improved by adopting modes such as bottom expanding, additional anchor ribs and the like, the construction complexity and cost are increased. On the other hand, the existing anti-floating pile with the anchoring structure is mostly complex in one-time use or disassembly, cannot be reused, and causes waste of engineering consumables and low construction efficiency. Therefore, the anti-floating steel pipe pile which is suitable for the existing underground structure with limited clearance, is convenient to construct, stable and reliable in anti-pulling bearing capacity, reusable in driving and connecting devices and simple and convenient to process and install in an anchoring structure is developed, and has obvious engineering requirements and technical values. Based on the structure, the invention provides a screw motor driven and unfolded anchor claw anti-floating steel pipe pile structure and a construction method thereof. Disclosure of Invention The invention aims to solve the problems that the conventional steel pipe pile has insufficient pulling-resistant bearing capacity, an anchoring driving device cannot be recycled, the anchoring structure is processed and installed in the existing floating-resistant reinforcement engineering of the underground structure, and particularly, the floating-resistant steel pipe pile structure formed by a steel pipe pile main body, a screw motor driving device, a pushing transmission assembly and a fluke structure is matched with a corresponding construction flow, so that the purposes of adapting to the construction environment with limited clearance of the existing underground structure without high construction equipment, ensuring the construction process conveniently and causing small disturbance to the existing structure and the surrounding environment are realized, driving the fluke structure to be outwards unfolded and embedded into the surrounding soil body by virtue of the screw motor driving pushing transmission assembly, forming a double pulling-resistant mechanism of 'pile body side friction resistance and fluke anchoring force', remarkably improving the pulling-resistant bearing capacity of the steel p