Recyclable pile foundation

Patent metadata

Field	Value
Publication number	US-11629475-B2
Application number	US-202217939633-A
Country	US
Kind code	B2
Filing date	Sep 7, 2022
Priority date	Sep 10, 2021
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

A recyclable pile foundation is provided. The recyclable pile foundation includes several inner cylinders, several outer cylinders and several reciprocating components which are circumferentially distributed between the inner cylinders and the outer cylinders. Each reciprocating component includes several steel collars, a push-pull rod, a hold component and at least one motion component. The motion components are distributed along the push-pull rod. Each motion component includes at least one triangular connection plate, several connection rods, an inner wedge block, an outer wedge block, a motion block and a pointed rod. When the push-pull rod is pushed along its own axis to the pushed position, the pointed rod protrudes from the outer cylinders to increases the friction between the surrounding soil and the recyclable pile foundation. When the push-poll rod is pulled along its own axis to the pulled position, the pointed rods retract back into the outer cylinders.

First claim

The invention claimed is:

1. A recyclable pile foundation, comprising:
at least two inner cylinders coaxially distributed along a first axis thereof, wherein adjacent two inner cylinders of the at least two inner cylinders are detachably connected;
at least two outer cylinders coaxially distributed along the first axis, wherein each outer cylinder coaxially surrounds a corresponding inner cylinder of the at least two inner cylinders, and each outer cylinder is connected with the corresponding inner cylinder through at least two steel bars; and
at least three reciprocating components circumferentially distributed between the at least two inner cylinders and the at least two outer cylinders, wherein each reciprocating component comprises:
at least two steel collars, wherein each steel collar is welded to a steel bar of the at least two steel bars;
a push-pull rod parallel to the first axis, wherein the push-pull rod passes through the at least two steel collars and is only movable along a second axis of the push-pull rod under a limitation of the at least two steel collars;
a hold component configured to hold the push-pull rod in a pushed position or in a pulled position, wherein the hold component is detachably connected to a head block arranged at an upper end of the push-pull rod; and
at least one motion component distributed along the push-pull rod, wherein each motion component comprises:
at least one triangular connection plate, wherein each triangular connection plate is fixedly connected to the push-pull rod;
a plurality of connection rods, wherein each connection rod is fixedly connected to a triangular connection plate of the at least one triangular connection plate;
an inner wedge block fixedly connected to at least one of the plurality of connection rods, wherein the inner wedge block has a first inclined plane;
an outer wedge block fixedly connected to at least one of the plurality of connection rods, wherein the outer wedge block has a second inclined plane opposite and parallel to the first inclined plane;
a motion block arranged between two steel bars of the at least two steel bars, wherein the motion block is only movable perpendicularly to the first axis under a limitation of the two steel bars, the motion block is arranged between the inner wedge block and the outer wedge block and slidably in contact with both the first inclined plane and the second inclined plane; and
a pointed rod perpendicular to the first axis and attached to the motion block;

wherein:
when the push-pull rod is pushed along the second axis to the pushed position, the inner wedge block and the outer wedge block move with the push-pull rod to drive the motion block to move, and the pointed rod moves with the motion block and protrudes from an outer cylinder of the at least two outer cylinders passing through a first hole arranged at the outer wedge block and a second hole arranged at the outer cylinder; and
when the push-pull rod is pulled along the second axis to the pulled position, the inner wedge block and the outer wedge block move with the push-pull rod to drive the motion block to move, and the pointed rod moves with the motion block and retracts.

2. The recyclable pile foundation according to claim 1 , wherein
the limitation of the two steel bars is created by two limiting steel plates fixed to the two steel bars respectively, each limiting steel plate is attached with a plurality of rotatable steel balls, the plurality of rotatable steel balls of one limiting steel plate of the two limiting steel plates are in rolling contact with a top surface of the motion block, and the plurality of rotatable steel balls of the other limiting steel plate of the two limiting steel plates are in rolling contact with a bottom surface of the motion block; and
the motion block is provided with a through hole for the push-pull rod to pass through, wherein a cross section of the through hole is bar-shaped.

3. The recyclable pile foundation according to claim 2 , wherein the pointed rod comprises:
a cylindrical body; and
an apex portion comprising at least three right-angled trapezoidal steel plates forming a pointed end.

4. The recyclable pile foundation according to claim 3 , further comprising a ring seal portion configured to seal a ring gap between a bottom end of the at least two inner cylinders and a bottom end of the at least two outer cylinders, wherein a longitudinal section of the ring seal portion is cone-shaped.

5. The recyclable pile foundation according to claim 1 , wherein the hold component comprises:
two clamping blocks arranged opposite each other and configured to clamp the head block arranged at the upper end of the push-pull rod;
at least two pairs of block holders distributed along the push-pull rod, wherein each pair of block holders comprises two block holders that are arranged opposite each other and that are configured to hold the two clamping blocks respectively, one block holder of the two block holders is fixed on a top inner cylinder of the at least two inner cylinders and the other block holder of the two block holders is fixed on a top outer cylinder of the at least two outer cylinders; and
two steel blocks removably placed in the two block holders, respectively, of a pair of block holders of the at least two pairs of block holders;
wherein for each pair of block holders,
when the two steel blocks are placed in the two block holders respectively and the two clamping blocks are held by the two block holders respectively, the two clamping blocks clamp the head block; and
when the two steel blocks are removed from the two block holders, the two clamping blocks release the head block.

6. The recyclable pile foundation according to claim 5 , wherein each clamping block of the two clamping blocks is T-shaped and comprises:
a clamping portion configured to contact and clamp the head block, wherein a contacting surface of the clamping portion for contacting the head block is provided with a plurality of anti-slip patterns; and
an inserting rod perpendicular to the clamping portion and configured to insert into a blind hole arranged in a block holder of the at least two pairs of block holders; and
wherein
when the inserting rod of a corresponding clamping block inserts into the blind hole of the block holder, the block holder holds the corresponding clamping block; and
when a steel block of the two steel blocks is placed in a bottom of the blind hole, an end of the inserting rod inserted into the blind hole is blocked by the steel block.

7. The recyclable pile foundation according to claim 6 , wherein the clamping portion is C-shaped and has at least two convex edges for blocking the head block.

Assignees

• Univ Hainan

Inventors

• Wang Yongwei
• Dong Qinxi
• Zhang Youliang
• Song Xinying

Classifications

• E02D5/56

  Screw piles {(placing piles by screwing down E02D7/22)} · CPC title

• E02D5/48 Primary

  Piles varying in construction along their length {, i.e. along the body between head and shoe, e.g. made of different materials along their length (E02D5/50, E02D5/52 take precedence)} · CPC title

• E02D5/72

  Pile shoes · CPC title

• E02D27/12 Primary

  Pile foundations · CPC title

• E02D5/28

  made of steel {or other metals (E02D5/52 takes precedence)} · CPC title