CN218233438U

CN218233438U - Precast pile connection structure with crossover sub

Info

Publication number: CN218233438U
Application number: CN202222803482.7U
Authority: CN
Inventors: 姚振宇; 包华; 姚锋祥; 张宏其
Original assignee: Jiangsu Jinzhuang Geotechnical Technology Co ltd
Current assignee: Jiangsu Jinzhuang Geotechnical Technology Co ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-01-06
Anticipated expiration: 2032-10-24

Abstract

The utility model discloses a precast pile connecting structure with a crossover sub, which comprises a precast pile I, a precast pile II and a crossover sub; the adapter is an independent connecting piece, a first boss is arranged at the upper part of the adapter, and a second boss is arranged at the lower part of the adapter; the first boss is inserted into an inner cavity at the lower end of the first precast pile for positioning, and the second boss is inserted into an inner cavity at the top end of the second precast pile for positioning; the contact surface of the adapter is connected with the end plates of the precast pile I and the precast pile II in a welding mode through the adapter; or the conversion joint is connected with the end plates of the precast pile I and the precast pile II in a bolt mechanical mode by utilizing the connecting holes. The utility model can fully optimize the comprehensive bearing performance of the precast pile, fully exert the bearing capacity of the pile body, and has remarkable technical and economic properties and strong feasibility; the design method and the construction method of the existing precast pile are hardly influenced, and the technical reliability is high.

Description

Precast pile connection structure with crossover sub

Technical Field

The utility model relates to a civil construction field, concretely relates to precast pile connection structure with crossover sub.

Background

The pile foundation is a foundation form with high bearing capacity, wide application range and excellent comprehensive performance. The precast pile is widely accepted and commonly applied in the engineering field due to short construction time and high reliability. In recent years, precast piles are continuously used in engineering as an important independent pile type, and are also used in large quantities as core piles of composite piles.

The connection mode of the precast pile is the key for exerting the bearing performance of the precast pile. In consideration of the actual conditions and technical requirements of precast piles such as transportation, pile sinking and the like, the common precast piles are generally between 10 and 15 meters. Piles with the length exceeding the length are required to be connected in sections in a reliable welding mode, a mechanical mode and the like in a pile sinking process on site to achieve the designed pile length.

The existing pile joints are formed by directly integrating the connecting structure into the end of each pile section. The common method comprises the following steps: a, embedding steel end plates at pile ends, hoisting a rear pile section above a front pile section when the front pile section reaches a certain depth in site construction, and welding and connecting the rear pile section and the front pile section through the steel end plates at the end parts of two piles; and b, corresponding embedded parts can be reserved at the pile ends of the two pile sections, and quick connection is realized through mechanical modes such as bolts, buckles and bolts. Practice shows that the methods and technologies have reliable performance and high economical efficiency on the whole.

However, as the demand for large bearing capacity piles is gradually increased in engineering, the traditional precast pile has some disadvantages. a load transfer angle: the load borne by the pile top can be gradually transferred and diffused to the deep layer of the soil layer at the periphery of the pile body, the stress of the pile body below the proper depth of the pile top is obviously reduced, and the pile with the same size and bearing capacity as the pile top is not necessary to be adopted at the middle lower part of the pile body; b, when the vertical bearing capacity of the pile body is contradictory to the horizontal bearing capacity: the horizontal bearing capacity of the pile is mainly determined by the horizontal bearing capacity of a part of a pile body below the top of the pile. For a prestressed concrete pipe pile with a conventional size (such as the outer diameter of 400 mm-800 mm), the part 4-5 m below the pile top is most affected by horizontal load, and the excessively deep pile body has no great significance on the horizontal bearing capacity of the pile. When the requirement of the vertical and horizontal ultimate bearing capacity of the pile is met, the actual bearing capacity in a certain direction is far lower than the actual bearing capacity. The existing single-specification precast pile matching mode commonly adopted in engineering is to form a pile by connecting pile sections with the same specification, so that the bearing capacity of a pile body except for the outer part of a pile top at most cannot be fully exerted.

One of the methods for solving the problems is to develop a joint mode capable of realizing piles of different specifications, types and materials, so that the existing and mature precast pile types of various specifications, types and materials can be continuously used, the multi-angle bearing capacity design requirement of the pile body is flexibly met, the redevelopment of various precast pile types capable of realizing conversion connection is avoided, the technology is simple, and the economical efficiency is good.

Disclosure of Invention

The invention aims to: the prefabricated pile type switching of different specifications, types and materials is realized, the comprehensive bearing performance of the existing standardized prefabricated pile is fully exerted, the flexibility of the design and construction of the prefabricated pile is greatly improved, and the economic benefit of the use of the prefabricated pile is reasonably improved. The utility model provides a precast pile connection structure with crossover sub is applicable to fields such as civil construction.

The technical scheme is as follows: in order to achieve the above purpose, the utility model discloses technical scheme as follows: a precast pile connecting structure with an adapter comprises a precast pile I, a precast pile II and an adapter;

the conversion joint is arranged between the precast pile I and the precast pile II, and the precast pile I above the conversion joint is connected with the precast pile II below the conversion joint;

the adapter is an independent connecting piece, a first boss is arranged at the upper part of the adapter, and a second boss is arranged at the lower part of the adapter; the first boss is inserted into the inner cavity at the lower end of the first precast pile for positioning, and the second boss is inserted into the inner cavity at the top end of the second precast pile for positioning;

the contact surface of the adapter is connected with the end plates of the precast pile I and the precast pile II in a welding mode through the adapter; or the conversion joint is connected with the end plates of the precast pile I and the precast pile II in a bolt mechanical mode by utilizing the connecting holes.

Preferably, the included angle alpha between the side surface of the conversion joint and the horizontal plane is 15-90 degrees.

Preferably, the outer edge shape of the cross section of the conversion joint is circular or polygonal.

Preferably, the connecting hole on the conversion joint is circular or polygonal.

Preferably, the material of the adapter can be made of metal or nonmetal material, single material or composite material.

Has the beneficial effects that:

the utility model discloses a crossover sub realizes the connection of the precast pile of different specifications, type, material, can reach following beneficial effect:

and a, optimizing the vertical bearing performance of the precast pile. According to the characteristic that the stress of the pile body is gradually reduced from the pile top to the pile end, the section size of the prefabricated pile section is gradually reduced from the pile top to the bottom in a segmented mode, the self bearing capacity of each pile section is fully exerted to the greatest extent, and the utilization rate of the bearing performance of the pile body is improved;

and b, coordinating the vertical and horizontal bearing performance of the prefabricated pile body. When the vertical bearing capacity of the pile body is met and the horizontal bearing capacity is insufficient, the precast pile with large size and high bearing capacity can be adopted near the pile top with decisive significance for the horizontal bearing capacity, so that the horizontal bearing capacity of the pile body is improved. When the conventional precast pile is not needed to be matched, the pile type with larger size as the pile top is required to be uniformly adopted in the whole pile length range, and the vertical and horizontal bearing performance of the prefabricated pile body is well coordinated with the economical efficiency.

And c has strong practicability. The method for connecting the precast piles with different specifications, types and materials by the independent adapter outside the pile body can be directly applied to various existing standardized precast pile types, has no influence on the design method and the construction method of the existing precast pile, and has strong technical feasibility.

Drawings

Fig. 1 is a schematic view of the connection structure of the precast pile with the adapter of the present invention.

Fig. 2 is a schematic view of an adapter according to embodiment 1 of the present invention.

Fig. 3 is a sectional view taken along the line a in fig. 2.

Fig. 4 is a sectional view taken along line B in fig. 2.

Fig. 5 is a schematic view of an adapter according to embodiment 2 of the present invention.

Fig. 6 is a cross-sectional view taken along line C of fig. 5.

Fig. 7 is a cross-sectional view taken along line D in fig. 5.

Fig. 8 is a schematic view of an adapter according to embodiment 3 of the present invention.

Fig. 9 is a sectional view taken along line E in fig. 8.

Fig. 10 is a sectional view taken along line F in fig. 8.

Wherein: 1-precast pile one, 2-precast pile two, 3-crossover sub, 4-boss one, 5-boss two, 6-contact surface one, 7-contact surface two, 8-connecting hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, so that those skilled in the art can better understand the advantages and features of the present invention, thereby defining the protection scope of the present invention more clearly.

Example 1

As shown in fig. 1-4: a precast pile connecting structure with an adapter comprises a precast pile I1, a precast pile II 2 and an adapter 3; the conversion joint 3 is arranged between the precast pile I1 and the precast pile II 2, and the precast pile I1 above the conversion joint 3 is connected with the precast pile II 2 below the conversion joint 3;

the adapter 3 is an independent connecting piece, a boss I4 is arranged at the upper part of the adapter 3, and a boss II 5 is arranged at the lower part of the adapter 3; the first boss 4 is inserted into an inner cavity at the lower end of the first precast pile 1 for positioning, and the second boss 5 is inserted into an inner cavity at the top end of the second precast pile 2 for positioning; the contact surface of the conversion joint 3 is connected with the end plates of the precast pile I1 and the precast pile II 2 through the conversion joint 3 in a welding mode; or the conversion joint 3 is mechanically connected with the end plates of the precast pile I1 and the precast pile II 2 through bolts by using the connecting holes 8.

The included angle alpha between the side surface of the adapter 3 and the horizontal plane is between 15 and 90 degrees. The outer edge of the cross section of the adapter 3 is circular. The connecting hole on the conversion joint 3 is circular. The material of the adapter 3 is made of metal material.

The operation method of the precast pile connecting structure with the adapter comprises the following steps:

1) Sinking the precast pile II 2 (the prestressed concrete pipe pile) to a proper depth in modes of hammering, static pressure, vibration and the like;

2) Extending a second boss 5 on the conversion joint 3 into an inner cavity at the top end of the second precast pile 2 for positioning, and connecting a second contact surface 7 of the conversion joint 3 with an end plate at the top of the second precast pile 2 in a welding mode, or connecting the second contact surface with a connecting hole 8 in a mechanical mode such as a bolt;

3) Moving a precast pile I1 (a prestressed concrete pipe pile) to a position above the adapter 3, inserting an inner cavity at the lower end of the precast pile I1 into a boss I4 on the adapter 3 for positioning, and connecting a contact surface I6 of the adapter 3 with an end plate at the end part of the precast pile I1 in a welding mode;

4) Continuously sinking the precast pile I1 into foundation soil in a static pressure mode;

5) And (4) repeating the steps 2) to 4) according to the requirement of pile splicing quantity.

Example 2

As shown in fig. 1, 5, 6, and 7: the present embodiment is different from embodiment 1 in that: the precast pile I1 is changed into a prestressed concrete hollow square pile, and the outer edge of the cross section of the adapter 3 is square.

Example 3

As shown in fig. 1, 8, 9, 10: this embodiment is different from embodiment 1 in that: the precast pile I1 is changed into a prestressed concrete solid square pile, and the outer edge of the cross section of the adapter 3 is square.

The above embodiments are only for illustrating that the present invention can be implemented, and do not represent that the present invention can be implemented only according to the above embodiments. The utility model discloses an each component part size, position, geometry and angle, used material etc. all can change and adjust according to actual requirement and particular case to some extent.

Claims

1. The utility model provides a precast pile connection structure with crossover sub which characterized in that: the prefabricated pile comprises a prefabricated pile I, a prefabricated pile II and a conversion joint;

the conversion joint is arranged between the first precast pile and the second precast pile, and the first precast pile above the conversion joint is connected with the second precast pile below the conversion joint;

the adapter is an independent connecting piece, a boss I is arranged at the upper part of the adapter, and a boss II is arranged at the lower part of the adapter; the first boss is inserted into the inner cavity at the lower end of the first precast pile for positioning, and the second boss is inserted into the inner cavity at the top end of the second precast pile for positioning;

2. A precast pile connection structure with an adapter according to claim 1, characterized in that: the included angle alpha between the side surface of the adapter and the horizontal plane is 15-90 degrees.

3. A precast pile connection structure with an adapter according to claim 1, characterized in that: the outer edge of the cross section of the adapter is circular or polygonal.

4. A precast pile connection structure with an adapter according to claim 1, characterized in that: the connecting hole on the adapter is circular or polygonal.

5. A precast pile connection structure with an adapter according to claim 1, characterized in that: the material of the conversion joint is a metal material, a non-metal material, a single material or a composite material.