CN-121976525-A - Be applied to mixed type maintenance structure from interlock bored concrete pile

CN121976525ACN 121976525 ACN121976525 ACN 121976525ACN-121976525-A

Abstract

The invention provides a self-occluding cast-in-place pile applied to a hybrid maintenance structure, which comprises a mould, a keel frame, a cement pouring and forming device and a self-occluding cast-in-place pile, wherein the mould comprises a bottom support piece and a peripheral support piece which are integrally formed, the peripheral support piece is distributed along the height direction of a pile body and is formed by alternately arranging a hard support layer and a flexible deformation layer, the hard support layer and the flexible deformation layer are continuously distributed along the peripheral side, the keel frame is arranged in the mould, cement pouring and forming device is arranged in an inner cavity of the mould, and after the cement pouring of the mould, the peripheral side of the mould forms a wavy curved surface. According to the technical scheme, the lateral pressure generated in the cement pouring process is utilized to push the flexible deformation layer to uniformly protrude outwards, the shaping effect of the rigid supporting layer is matched, the outer wall of the bored concrete pile is enabled to be self-shaped into a continuous wavy engagement surface, the contact area with the outer side high-pressure jet grouting pile is greatly increased, the double engagement effect of mechanical engagement and cement soil adhesion is formed, and the technical problems that the conventional smooth face bored concrete pile is not tightly engaged with the jet grouting pile, water seepage is easy, and the stress coordination is poor are solved.

Inventors

YANG GUOXIAN
WANG YANG
LI TIE
ZHOU LIANWEI
LI ZHIQIANG
ZHOU KAI
MA JIACHENG

Assignees

中国化学工程第十三建设有限公司

Dates

Publication Date: 20260505
Application Date: 20260326

Claims (10)

1. Be applied to self-biting bored concrete pile of mixed maintenance structure, characterized by comprising: The mould (1), mould (1) includes integrated into one piece's bottom support (11) and week side support (12), the top of mould (1) is the opening setting, week side support (12) are laid along stake body height direction to constitute in turn by rigid support layer (121) and flexible deformation layer (122), rigid support layer (121) and flexible deformation layer (122) are arranged in succession along the week side; And also comprises A keel frame (2), wherein the keel frame (2) is arranged inside the die (1), Cement, cement pouring and molding are carried out in the inner cavity of the die (1), and after the cement is poured into the die (1), the periphery of the die (1) is enabled to form a wavy curved surface.
2. Self-occluding cast-in-place pile applied to hybrid maintenance structure according to claim 1, characterized in that an auxiliary reinforcing rib (3) is arranged inside the mould (1), one end of the auxiliary reinforcing rib (3) is fixedly connected to the rigid supporting layer (121) or the flexible deformation layer (122), and the other end of the auxiliary reinforcing rib (3) is detachably and fixedly connected with the keel frame (2).
3. Self-biting filling pile applied to hybrid maintenance structure according to claim 1, characterized in that the peripheral outer wall of the mould (1) is provided with a plurality of auxiliary extension pieces (4), one end of each auxiliary extension piece (4) is integrally arranged with the rigid supporting layer (121) or the flexible deformation layer (122).
4. A self-engaging cast-in-place pile for hybrid maintenance structures according to claim 3, characterized in that the auxiliary extension (4) is a screw (41) in which a rigid support bar (42) is arranged.
5. Self-engaging cast-in-place pile for hybrid maintenance structures according to claim 4, characterized in that the screw flights (41) increase in diameter distally from the end close to the mould (1).
6. The self-biting cast-in-place pile applied to the hybrid maintenance structure according to claim 1, wherein connecting ribs (5) are arranged at the joint positions of the rigid supporting layer (121) and the flexible deformation layer (122) inside the mold (1), and the connecting ribs (5) are attached to the inner wall of the mold (1) and are used for reinforcing the structural strength of the joint positions of the two layers.
7. Self-occluding cast-in-place pile applied to hybrid maintenance structure according to claim 1 or 6, characterized in that a plurality of supporting bows (6) are arranged in the peripheral side area of the flexible deformation layer (122) in the mould (1), and two ends of the supporting bows (6) are fixed on the inner walls of the rigid supporting layers (121) which are adjacent to each other up and down of the flexible deformation layer (122).
8. The self-biting bored concrete pile applied to a hybrid maintenance structure according to claim 1, wherein the peripheral side supporting member (12) is an integrated closed cylinder structure, and lateral pressure generated in the cement pouring process can push the flexible deformation layer (122) to protrude outwards uniformly, so that the outer wall of the mold (1) forms a continuous wavy biting surface, and the contact biting area with the outer side high-pressure jet grouting pile is increased.
9. Self-biting filling pile for hybrid maintenance structures according to claim 1, characterized in that the rigid supporting layer (121) is made of glass-fibre reinforced PVC rigid profiles.
10. Self-engaging cast-in-place pile for hybrid maintenance structures according to claim 1 or 9, characterized in that the flexible deformation layer (122) is made of TPV thermoplastic elastomer material.

Description

Be applied to mixed type maintenance structure from interlock bored concrete pile Technical Field The invention relates to the technical field of foundation pit support, in particular to a self-biting filling pile applied to a hybrid maintenance structure. Background In the field of municipal small-sized structure foundation pit supporting engineering, in particular to a construction scene of shallow to medium deep foundation pits such as a rainwater lifting pool and positioned in a soft soil high-groundwater-level area, a reinforced concrete bored concrete pile and high-pressure jet grouting pile combined supporting system becomes a mainstream application scheme. The system relies on the bored concrete pile as a core stress structure to bear the main lateral pressure of soil mass transfer outside a foundation pit, and simultaneously, high-pressure jet grouting piles are arranged outside the bored concrete pile to stir the soil mass and form a cement soil curtain through high-pressure cement slurry so as to block a groundwater infiltration channel, thereby realizing the dual functions of soil blocking and water stopping. But in actual construction and application process, the working condition characteristics of the foundation pit of the rainwater lifting pond are combined, and the technical defects that the prior art scheme is difficult to avoid exist, so that the overall stability, the water stopping effect and the construction efficiency of the supporting structure are seriously restricted. The conventional cast-in-place pile is formed by a plurality of traditional construction molds, and comprises a detachable round steel mold, a wooden template or a single-layer hard disposable cement mold shell, wherein the outer wall of a pile body is of a smooth round section after casting is completed. The contact form of the smooth pile body and the high-pressure jet grouting pile at the outer side is simple surface lamination, no mechanical jogged structure exists between the smooth pile body and the high-pressure jet grouting pile, and the contact area is extremely limited. Under the working conditions that the soft soil foundation is extruded by soil bodies and water pressure is generated by high groundwater level, gaps are very easy to occur between the cast-in-place piles and the jet grouting piles, dislocation occurs, a continuous airtight water stop barrier cannot be formed, the seepage prevention requirement of the foundation pit of the rainwater lifting pool is difficult to guarantee, groundwater is very easy to infiltrate into the pit from the gaps among piles, the attaching gaps of the pile bodies and the jet grouting piles, the difficulty and the cost of foundation pit dewatering construction are increased, softening and collapse of pit wall soil bodies are possibly caused, and the integral safety of the foundation pit is threatened. Meanwhile, the smooth pile body cannot form effective mechanical engagement with the jet grouting pile, the stress is transmitted only by means of the cohesive force of cement soil, the whole support system is poor in synergy, the problems of single pile body deflection and local cracking of the jet grouting pile curtain are easily caused, and the reliability of the support structure is further reduced. Disclosure of Invention According to the invention, the self-biting filling pile applied to the hybrid maintenance structure comprises a mould, wherein the mould comprises a bottom support piece and a peripheral support piece which are integrally formed, the top of the mould is provided with an opening, the peripheral support piece is distributed along the height direction of the pile body and is formed by alternately arranging a hard support layer and a flexible deformation layer, the hard support layer and the flexible deformation layer are continuously arranged along the peripheral side, the self-biting filling pile further comprises a keel frame, the keel frame is arranged in the mould, cement is poured and formed in an inner cavity of the mould, and after the cement is poured into the mould, the peripheral side of the mould forms a wavy curved surface. The technical characteristics are that the lateral pressure generated in the cement pouring process is utilized to push the flexible deformation layer to uniformly protrude outwards, the shaping effect of the rigid support layer is matched, the continuous wave-shaped engagement surface is self-formed on the outer wall of the cast-in-place pile, the contact area between the cast-in-place pile and the high-pressure jet grouting pile on the outer side is greatly increased, the double engagement effect of mechanical engagement and cement soil adhesion is formed, the technical problems that the conventional smooth-surface cast-in-place pile is not tightly engaged with the jet grouting pile, water seepage is easy, and the stress cooperativity is poor are solved, meanwhile, the soft and hard alternate peripheral side support pi