CN113957888A - Assembled expands body stake - Google Patents
Assembled expands body stake Download PDFInfo
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- CN113957888A CN113957888A CN202111390203.2A CN202111390203A CN113957888A CN 113957888 A CN113957888 A CN 113957888A CN 202111390203 A CN202111390203 A CN 202111390203A CN 113957888 A CN113957888 A CN 113957888A
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- prefabricated
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/48—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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses an assembled type expanded pile, which comprises a prefabricated connecting section, wherein the upper part of the prefabricated connecting section is connected and combined with a prefabricated variable-step reducing section, and a plurality of prestress reinforcing materials are arranged in the prefabricated variable-step reducing section in a segmented mode, so that different prestress effects are exerted on different sections in the prefabricated variable-step reducing section. The invention ensures that the precast pile as the composite pile core pile is more reasonably stressed, fully exerts the bearing capacity of the precast pile body material and greatly improves the economy.
Description
Technical Field
The invention relates to the field of civil construction, in particular to an assembled type expanding pile.
Background
The composite pile with the combined cross section (hereinafter referred to as the composite pile) consisting of the rigid core pile and the outer wrapping mixture is one of important directions of pile foundation development, and has the characteristics of high single-pile bearing capacity, good environmental protection, durability, economy and the like. The pile type has been researched and applied for about 30 years in China, and is usually formed by combining reinforced concrete or steel core piles and semi-rigid cement soil. The pile type names are various, but the process can be that a rigid core pile is mainly placed in a prefabricated cement pile. The core pile can be a cast-in-place pile or a precast pile can be directly inserted. In view of various factors such as construction efficiency, economy, environmental protection and the like, the precast pile is the most widely adopted core pile form of the composite pile.
The precast pile used as the core pile at present mainly comprises a prestressed concrete pipe pile, a prestressed hollow square pile, a prestressed solid square pile and the like, and has the following obvious defects in engineering application: (1) the bearing capacity of the pile body can not be effectively exerted. The selection of core piles in the engineering is generally controlled by the maximum load of the pile top. When the pile foundation reaches the ultimate bearing capacity, the prefabricated pile core pile only fully exerts the bearing capacity near the pile top at most, and the load strength of the material at the middle lower part of the pile body is far lower than the material strength of the pile body. And precast piles with different diameters or side lengths cannot be mixed. (2) The bottom-expanding capacity cannot be efficiently utilized. Along with the increase of the buried depth of the soil layer, the bearing capacity of the deep soil body is often rapidly increased. But the effective area of the pile end of the precast pile is usually small. The end-bearing capacity of the bottom of a precast pile is often difficult to effectively utilize. (3) The prestress setting is not reasonable. The prestress is applied to the precast pile, so that the non-bearing damage of the precast pile in the links of construction, transportation and the like can be effectively reduced. However, the prestressing force can only be applied according to a single-section precast pile at present, and the requirement of setting corresponding prestressing force along the pile body section according to the stress condition cannot be met.
In summary, the existing precast pile has a large spare space for bearing capacity, but in view of the stress characteristics of the pile body, when the precast pile is used as a composite pile core pile, if the bearing capacity of the core pile is improved, the pile diameter can only be increased, and the like, so that the precast pile is not economical and cannot economically and well meet the requirements of the composite pile. There is therefore a need to develop a precast pile type suitable for composite core piles.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a precast pile for a composite pile core pile, which is suitable for the fields of civil construction and the like, in order to fully utilize and reasonably exert the bearing capacity of the composite pile core pile and improve the economy of the precast core pile of the composite pile.
The technical scheme is as follows: in order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides an assembled expanding body stake which characterized by: the connecting structure comprises a prefabricated connecting section, wherein the upper part of the prefabricated connecting section is connected and combined with a prefabricated variable-order reducing section, a plurality of prestress reinforcing materials are arranged in the prefabricated variable-order reducing section in a segmented mode, and different prestress effects are exerted on different sections in the prefabricated variable-order reducing section.
In the prefabricated connecting section, a plurality of prestress reinforcing materials are arranged in sections, so that different prestress effects are exerted on different sections in the prefabricated connecting section.
The lower end of the prefabricated connecting section is connected and combined with a prefabricated enlarged base or another prefabricated variable-step reduction section; the overall dimension of the prefabricated variable-step reduction section above the prefabricated connecting section is gradually reduced from top to bottom in a stepped manner; and the overall dimension of the prefabricated variable-step reduction section above the prefabricated connecting section is gradually reduced from bottom to top from large to small.
The size difference value b of each step of the prefabricated variable-step reduction section is generally 20 mm-200 mm (preferably 50-200 mm); the middle is hollow or solid.
The prestressed reinforcement material is a prestressed reinforcement or a composite material fiber reinforcement or other metal or nonmetal materials; the geometric form of the prestress reinforcing material is a straight line or a curve.
The cross sections of the prefabricated variable-step reducing section, the prefabricated connecting section and the prefabricated expanded bottom are circular or polygonal and the like.
The materials of the prefabricated variable-step reduction section, the prefabricated connecting section and the prefabricated enlarged base are concrete non-metal materials or metal materials.
The prefabricated variable-step reduction section and the prefabricated connecting section are connected and combined into a one-step integral casting formation.
After the part prefabrication variable-step reduction section, the prefabrication connection section and the prefabrication enlarged base are respectively prefabricated, the prefabricated pile is assembled in a factory or an engineering site to form an integrated assembly type pile; or prefabricating part of parts, and assembling to form an integrated assembly type pile in a factory or an engineering site; or the prefabricated variable-step reduction sections are independently used to complete assembling in a factory or an engineering field to form the assembled pile.
The invention ensures that the precast pile as the composite pile core pile is more reasonably stressed, fully exerts the bearing capacity of the precast pile body material and greatly improves the economy.
The actual pile body stress generally shows a law that the stress gradually decreases from the top of the pile downwards. The prefabricated variable-step reduction section introduced by the invention can be manufactured by segmenting the variable cross section according to the change rule that the stress of the pile body is gradually reduced, so that the strength of the pile body material is fully exerted as much as possible in each section. The prefabricated connecting section can be designed and manufactured according to smaller load, and compared with the upper part of the pile, the prefabricated connecting section can be reduced in size and reduce the requirement on materials; if a proper bearing layer is provided, a prefabricated expanded base can be arranged at the lower part of the prefabricated connecting section, so that the end bearing capacity of the prefabricated connecting section is fully exerted; the variable cross-section characteristic of the prefabricated variable-step reduction section can give full play to the bearing capacity of a pile body material, plays a role in enhancing the bearing effect of a pile top, also enhances the interface bearing capacity between a core pile and a cement-soil pile, simultaneously ensures that various construction processes such as hammering, static pressure and the like can be applied, and has low requirements on construction equipment; the prestressed tendons are arranged in sections and the prestressed force is applied, so that the stress of different pile body sections can be controlled, the stress condition of the pile body is further rationalized, and the utilization rate and the economical efficiency of the composite pile body are improved.
The beneficial effects of the invention can be fully embodied by using the invention as a core pile in the reinforcement body of the composite pile which is not hardened.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic view of an assembled enlarged pile.
Fig. 2 is a cross-sectional schematic view of an enlarged pile with a prefabricated integral assembled pile body.
Fig. 3 is a cross-sectional view of an assembled enlarged pile with a prefabricated section type pile body.
Fig. 4 is a schematic cross-sectional view of an assembled enlarged pile with a curved segmented tendon.
Fig. 5 is a schematic cross-sectional view of an assembled enlarged pile of example 5.
1-prefabricated variable-order reduction section, 2-prefabricated connecting section, 3-prefabricated bottom expanding, 4-side wall, 5-reinforcement (the reinforcement can be cement containing admixture such as fly ash and slag, cement mortar, high-fluidity concrete, reclaimed material mixture and the like), 6-prefabricated variable-order reduction-section segmented prestressed tendon A, 7-prefabricated variable-order reduction-section segmented prestressed tendon B, 8-prefabricated variable-order reduction-section segmented prestressed tendon C and 9-prefabricated connecting-section prestressed tendon.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
The utility model provides an assembled expands body stake, includes prefabricated linkage segment 1, the top and the prefabricated 2 connection combinations of reduction of rank of change of prefabricated linkage segment, in the prefabricated reduction of rank of change, the segmentation sets up a plurality of prestressing force reinforcing materials, realizes that different prestressing force effects are applyed to different sections in the prefabricated reduction of rank of change. In the prefabricated connecting section, a plurality of prestress reinforcing materials are arranged in sections, so that different prestress effects are exerted on different sections in the prefabricated connecting section.
The lower end of the prefabricated connecting section is connected and combined with a prefabricated enlarged base or another prefabricated variable-step reduction section; the overall dimension of the prefabricated variable-step reduction section above the prefabricated connecting section is gradually reduced from top to bottom in a stepped manner; and the overall dimension of the prefabricated variable-step reduction section above the prefabricated connecting section is gradually reduced from bottom to top from large to small. The difference value b of the size of each step of the prefabricated variable-step reduction section is generally 50 mm-200 mm.
Example 1:
as shown in fig. 2:
process 1: binding a reinforcement cage, and arranging a segmented prestressed tendon 6, a segmented prestressed tendon 7 and a segmented prestressed tendon 8 in a prefabricated variable-step reduction section by adopting a pretensioning method; the prefabricated variable-order reduction-section segmented prestressed tendons 8 are connected with the prefabricated connecting-section prestressed tendons 9 to form full-length arrangement; the prestressing application may take the form of an end plate or an endless plate; the prefabricated variable-step reduction section 1 and the prefabricated connecting section 2 are integrally cast in a factory to be manufactured and molded, and after certain strength is achieved, the prestressed tendons are released to apply prestress on the concrete pile body. The upper part of the prefabricated variable-step reduction section 1, namely the area of the top of the pile can be made into a solid or hollow form;
and (2) a process: manufacturing a prefabricated expanded base 3;
and 3, process: integrally pouring the prefabricated variable-step reduction section 1 and the prefabricated connecting section 2 into a pile section and a prefabricated enlarged base 3 through welding or quick connectors on an engineering construction site to form a complete prefabricated pile;
and 4, process: and (3) after the cement soil pile is driven by adopting wet spraying, dry spraying, rotary spraying and other processes in the engineering field, immediately hoisting the integral precast pile spliced in the process (2) above the cement soil pile by using a crane, and sinking the precast pile into the reinforcement body 5 by adopting modes of hammering, static pressure, vibration and the like to form the composite pile.
Example 2:
as shown in fig. 2:
process 1: analogously to example 1. The segmental prestressed tendons 6 and the segmental prestressed tendons 7 in the prefabricated variable-stage reduction section are not pre-tensioned, and the pore channels are reserved. After the pre-stressed concrete pile body is prestressed by releasing the pre-stressed steel bars 8 and the pre-stressed steel bars 9 of the prefabricated variable-step reduction section arranged in the full length mode, appropriate pre-stress is applied according to an actually adopted post-tensioning method or the pre-stressed steel bars are not arranged.
And (2) a process: the same as example 1;
and 3, process: connecting the prefabricated variable-step reduction section 1, the prefabricated connecting section and the prefabricated expanded base 3 into a complete prefabricated pile through welding or quick joints on an engineering construction site;
and 4, process: the same as in example 1.
Example 3:
as shown in fig. 3:
process 1: analogously to example 1. As shown in fig. 1-2 and 1-3: the prefabricated variable-step reduction section 1 and the prefabricated connection section 2 are manufactured respectively, and the prestress of each part is applied according to needs by a pre-tensioning method or a post-tensioning method respectively;
and (2) a process: the same as example 1;
and 3, process: the same as example 1;
and 4, process: the same as in example 1.
Example 4:
as shown in fig. 4:
process 1: analogously to example 1. Wherein, the pre-fabricated segmental prestressed tendon 7 in the variable-order reduction section is in a curve shape;
and (2) a process: the same as example 1;
and 3, process: the same as example 1;
and 4, process: and (3) drilling a hole by a drilling machine on the engineering site to take soil, pre-stirring cement soil with proper consistency, injecting or re-injecting the pre-stirred cement soil into the drilled hole, and sinking the complete precast pile in the process (3) into the drilled hole to form the composite pile.
Example 5:
as shown in fig. 1-5:
process 1: similar to example 1, process 1. 2 prefabricated variable-step reduction sections 1 and prefabricated connecting sections 2 are prefabricated in advance;
and (2) a process: similar to example 2, procedure 1. Arranging a segmented prestressed tendon 6 and a segmented prestressed tendon 7 in a prefabricated variable-order reduction section;
and 3, process: one prefabricated variable-step reduction section 1 is used as a prefabricated enlarged base 3 and is connected with a prefabricated connecting section 2 and the other prefabricated variable-step reduction section 1 to form a complete prefabricated pile;
and 4, process: the same as in example 1.
The above embodiments are merely illustrative of the possible implementations of the present invention and are not intended to represent the only implementations possible in accordance with the embodiments described above. The dimensions, positioning, geometry and angles of the constituent parts of the invention, the materials used, etc., may vary and be adapted according to the actual requirements and the specific situation.
Claims (7)
1. The utility model provides an assembled expanding body stake which characterized by: the device comprises a prefabricated connecting section, wherein the upper part of the prefabricated connecting section is connected and combined with a prefabricated variable-order reduction section, and a plurality of prestress reinforcing materials are arranged in the prefabricated variable-order reduction section in a segmented manner, so that different prestress effects are exerted on different sections in the prefabricated variable-order reduction section; after the prefabricated variable-step reduction section and the prefabricated connecting section are respectively prefabricated, assembling the prefabricated variable-step reduction section and the prefabricated connecting section in a factory or an engineering site to form an integrated assembly type pile; the size phase difference value b of each step of the prefabricated variable-step reduction section is 20 mm-200 mm, and the middle part of the prefabricated variable-step reduction section is hollow or solid.
2. The fabricated enlarged pile of claim 1, wherein: in the prefabricated connecting section, a plurality of prestress reinforcing materials are arranged in sections, so that different prestress effects are exerted on different sections in the prefabricated connecting section.
3. An assembled enlarged pile according to claim 1 or claim 2, wherein: the lower end of the prefabricated connecting section is connected and combined with a prefabricated enlarged base or another prefabricated variable-step reduction section; the overall dimension of the prefabricated variable-step reduction section above the prefabricated connecting section is gradually reduced from top to bottom in a stepped manner; and the overall dimension of the prefabricated variable-step reduction section above the prefabricated connecting section is gradually reduced from bottom to top from large to small.
4. An assembled enlarged pile according to claim 1 or claim 2, wherein: the prestressed reinforcement material is prestressed reinforcement or composite material fiber reinforcement; the geometric form of the prestress reinforcing material is a straight line or a curve.
5. The fabricated enlarged pile of claim 3, wherein: the cross sections of the prefabricated variable-step reducing section, the prefabricated connecting section and the prefabricated expanded bottom are circular or polygonal.
6. The fabricated enlarged pile of claim 3, wherein: the materials of the prefabricated variable-step reduction section, the prefabricated connecting section and the prefabricated enlarged base are concrete non-metal materials or metal materials.
7. The fabricated enlarged pile of claim 1, wherein: the prefabricated variable-step reduction section and the prefabricated connecting section are connected and combined into a one-step integral casting formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111390203.2A CN113957888A (en) | 2021-11-23 | 2021-11-23 | Assembled expands body stake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111390203.2A CN113957888A (en) | 2021-11-23 | 2021-11-23 | Assembled expands body stake |
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| Publication Number | Publication Date |
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| CN113957888A true CN113957888A (en) | 2022-01-21 |
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| CN202111390203.2A Pending CN113957888A (en) | 2021-11-23 | 2021-11-23 | Assembled expands body stake |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644276A (en) * | 2012-04-28 | 2012-08-22 | 从卫民 | Supporting cantilever pile with prestress reinforced plastic rod and prestress steel bowstring composite structure |
| CN106480878A (en) * | 2016-12-05 | 2017-03-08 | 周同和 | A kind of upper and lower part expansion type soil cement is combined pile tube |
| CN108914930A (en) * | 2018-09-13 | 2018-11-30 | 健研检测集团有限公司 | A kind of prefabricated non-uniform pile and its construction method |
| CN111287178A (en) * | 2020-02-23 | 2020-06-16 | 王琪 | Variable cross-section reinforced concrete pile foundation and pile sinking method thereof |
| JP2020122327A (en) * | 2019-01-30 | 2020-08-13 | 株式会社Ｃｏｒｅ技術研究所 | Composite pile, and construction method of composite pile |
| CN113047267A (en) * | 2020-10-18 | 2021-06-29 | 王琪 | Stiffness composite assembly type club-footed pile and pile forming method thereof |
-
2021
- 2021-11-23 CN CN202111390203.2A patent/CN113957888A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644276A (en) * | 2012-04-28 | 2012-08-22 | 从卫民 | Supporting cantilever pile with prestress reinforced plastic rod and prestress steel bowstring composite structure |
| CN106480878A (en) * | 2016-12-05 | 2017-03-08 | 周同和 | A kind of upper and lower part expansion type soil cement is combined pile tube |
| CN108914930A (en) * | 2018-09-13 | 2018-11-30 | 健研检测集团有限公司 | A kind of prefabricated non-uniform pile and its construction method |
| JP2020122327A (en) * | 2019-01-30 | 2020-08-13 | 株式会社Ｃｏｒｅ技術研究所 | Composite pile, and construction method of composite pile |
| CN111287178A (en) * | 2020-02-23 | 2020-06-16 | 王琪 | Variable cross-section reinforced concrete pile foundation and pile sinking method thereof |
| CN113047267A (en) * | 2020-10-18 | 2021-06-29 | 王琪 | Stiffness composite assembly type club-footed pile and pile forming method thereof |
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Application publication date: 20220121 |