阅读说明：本技术 一种载体劲性复合桩及施工方法 (Carrier stiffening composite pile and construction method ) 是由 胡海滨 任志强 于卫锋 欧阳运敏 冯帅 王军华 于 2020-04-07 设计创作，主要内容包括：本发明公开了一种载体劲性复合桩,包括外桩身、内芯桩和载体扩大头底座,所述外桩身的内侧设置有内芯桩,且外桩身的下端与所述载体扩大头底座结合为一体,并且外桩身和内芯桩与载体扩大头底座共同受力。该载体劲性复合桩及施工方法,较于载体桩,载体劲性复合桩具有承载力强、用桩量少的优势,解决现有技术中建筑物的桩基承载力不足、桩的布设密度大和存在质量安全隐患等技术问题,利用散体材料外芯排水、护壁并挤密桩间土,而利用刚度和强度较大的芯桩可有效提高单桩承载力。(The invention discloses a carrier stiff composite pile which comprises an outer pile body, an inner core pile and a carrier expanded-head base, wherein the inner core pile is arranged on the inner side of the outer pile body, the lower end of the outer pile body and the carrier expanded-head base are combined into a whole, and the outer pile body, the inner core pile and the carrier expanded-head base are stressed together. Compared with a carrier pile, the carrier stiff composite pile has the advantages of strong bearing capacity and small pile consumption, solves the technical problems of insufficient bearing capacity of a pile foundation of a building, large pile arrangement density, potential quality safety hazards and the like in the prior art, utilizes the discrete material outer core for drainage, wall protection and compaction of soil between piles, and utilizes the core pile with higher rigidity and strength to effectively improve the bearing capacity of a single pile.)

1. The utility model provides a carrier strength nature composite pile, includes outer pile body (1), inner core pile (2) and carrier enlarged footing base (3), its characterized in that: the inner side of the outer pile body (1) is provided with an inner core pile (2), the lower end of the outer pile body (1) and the carrier enlarged footing base (3) are combined into a whole, and the outer pile body (1), the inner core pile (2) and the carrier enlarged footing base (3) are stressed together.

2. A carrier stiff composite pile according to claim 1, characterised in that: when the precast pile is constructed, the outer pile body (1) is compacted, and then the soil body is compacted by the outer pile body (1).

3. A carrier stiff composite pile according to claim 1, characterised in that: the construction quality of the carrier expansion head base (3) is verified through a static pressure value or a hammering penetration degree.

4. A carrier stiff composite pile according to claim 1, characterised in that: the inner core pile (2) is a prefabricated reinforced concrete pile or a cast-in-place reinforced concrete pile or a steel pipe concrete pile or other special-shaped structural members, and the section of the inner core pile is circular.

5. A carrier stiff composite pile according to claim 1, characterised in that: the carrier expansion head base (3) is made of dry hard concrete or dry mixed cement mortar or super hard concrete or steel fiber concrete or other mixtures.

6. A carrier stiff composite pile according to claim 1, characterised in that: the inner pile core (2) carries out compaction and diameter expansion on the outer pile body (1).

7. A carrier stiff composite pile according to claim 1, characterised in that: the pile end carrier expanded head base (3) is compacted by static pressure or hammering of the prefabricated pile body.

8. A construction method of a carrier stiff composite pile is characterized by comprising the following steps:

s1, forming holes according to the diameter of the outer pile body;

s2, constructing a pile end carrier expanded head base, and firstly performing compactness control on the carrier expanded head base and compacted soil body through three-level penetration in a carrier pile design rule;

s3, pouring the outer pile body on the composite pile body part;

s4, constructing an inner pile core through static pressure value or hammering penetration, and carrying out secondary compaction on the pile body and the soil body outside the pile body;

and S5, forming secondary compaction on the pedestal of the carrier expansion head by constructing the inner pile core through static pressure value or hammering penetration.

9. A carrier stiff composite pile according to claim 8, characterised in that: and the step S2 and the step S5 are technical methods of controlling the penetration degree of the carrier expansion head and controlling the pressure value or the penetration degree of the pile construction.

Technical Field

The invention relates to the technical field of civil engineering pile foundation construction, in particular to a carrier stiff composite pile and a construction method.

Background

The carrier stiff composite pile is a composite pile formed by the pile end carrier expanded head and the composite pile body, and solves the technical problems that the existing carrier pile is low in side friction resistance, the compactness of the carrier expanded head and the compaction effect of a compacted soil body are difficult to detect in the construction process of the carrier pile expanded head, the pile body concrete pouring adopts the pile body quality hidden trouble of self-flow pouring, the stiff composite pile is low in pile end bearing capacity, the shear resistance difference of a prefabricated hollow pile is low and the like, so that the carrier stiff composite pile can be widely applied to the civil engineering fields of building engineering, municipal engineering, water conservancy engineering and the like and is used as a pile foundation pile of a building foundation;

although the bearing capacity of the existing stiff composite pile is improved to a certain degree, the problems of low bearing capacity of the pile end, great difficulty in pile quality process control and the like exist, and meanwhile, when the compressive bearing capacity of the core pile reaches a certain load, the core pile can be punctured and damaged, the pile end loses the bearing capacity, so that the pile is unevenly settled, the upper structure of a building is damaged, and even the safety of the building is endangered.

Disclosure of Invention

The invention aims to provide a carrier stiff composite pile and a construction method thereof, which aim to solve the problems that although the bearing capacity of the existing stiff composite pile provided in the background technology is improved to a certain extent, the bearing capacity of the pile end is low, the pile forming quality process control difficulty is high and the like, and meanwhile, when the compressive bearing capacity of a core pile reaches a certain load, the core pile can be punctured and damaged, the bearing capacity of the pile end is lost, the pile is not uniformly settled, the upper structure of a building is damaged, and even the safety of the building is endangered.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a carrier strength nature composite pile, includes outer pile body, inner core pile and carrier enlarged footing base, the inboard of outer pile body is provided with the inner core pile, and the lower extreme of outer pile body with carrier enlarged footing base combines as an organic wholely to outer pile body and inner core pile and carrier enlarged footing base atress jointly.

Preferably, when the precast pile is constructed, the outer pile body is compacted, and then the soil body is compacted by the outer pile body.

Preferably, the construction quality of the carrier expansion head base is verified by a static pressure value or a hammering penetration degree.

Preferably, the core pile is a prefabricated reinforced concrete pile or a cast-in-place reinforced concrete pile or a steel pipe concrete pile or other special-shaped structural members, and the cross section of the core pile is circular.

Preferably, the carrier expansion head base is made of dry hard concrete or dry mixed cement mortar or super hard concrete or steel fiber concrete or other mixtures.

Preferably, the inner pile core compacts and expands the outer pile body.

Preferably, the pile end carrier expansion head base is compacted by static pressure or hammering of the prefabricated pile body.

Preferably, the vertical rods are fixedly connected with the box body, and the vertical rods and the transverse plates form a rotating structure.

The invention provides another technical scheme for providing a construction method of a carrier stiff composite pile, which comprises the following steps:

s1, forming holes according to the diameter of the outer pile body;

s2, constructing a pile end carrier expanded head base, and firstly performing compactness control on the carrier expanded head base and compacted soil body through three-level penetration in a carrier pile design rule;

s3, pouring the outer pile body on the composite pile body part;

s4, constructing an inner pile core through static pressure value or hammering penetration, and carrying out secondary compaction on the pile body and the soil body outside the pile body;

and S5, forming secondary compaction on the pedestal of the carrier expansion head by constructing the inner pile core through static pressure value or hammering penetration.

Preferably, the steps S2 and S5 are technical methods of controlling the penetration of the enlarged carrier head and controlling the pressure value or penetration of the pile.

Compared with the prior art, the invention has the beneficial effects that: compared with a carrier pile, the carrier stiff composite pile has the advantages of strong bearing capacity and small pile consumption, solves the technical problems of insufficient bearing capacity of a pile foundation of a building, large pile arrangement density, potential quality safety hazards and the like in the prior art, utilizes the discrete material outer core for drainage, wall protection and compaction of soil between piles, and utilizes the core pile with higher rigidity and strength to effectively improve the bearing capacity of a single pile.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the top-down structure of the present invention.

In the figure: 1. an outer pile body; 2. inner core piles; 3. a carrier enlarged head base.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a carrier strength nature composite pile, includes outer pile body 1, inner core pile 2 and carrier enlarged footing base 3, and the inboard of outer pile body 1 is provided with inner core pile 2, and the lower extreme of outer pile body 1 combines as an organic whole with carrier enlarged footing base 3 to outer pile body 1 and inner core pile 2 and carrier enlarged footing base 3 atress jointly.

In the construction of the precast pile in this embodiment, the outer pile body 1 is compacted, and then the outer pile body 1 compacts the soil.

The construction quality of the carrier expansion head base 3 is verified by a static pressure value or a hammering penetration.

The inner core pile 2 is a prefabricated reinforced concrete pile or a cast-in-place reinforced concrete pile or a steel pipe concrete pile or other special-shaped structural members, and the section of the inner core pile is circular.

The carrier expansion head base 3 is made of dry hard concrete or dry mixed cement mortar or super hard concrete or steel fiber concrete or other mixtures.

The inner pile core 2 carries out compaction and diameter expansion on the outer pile body 1.

The pile end carrier expanding head base 3 is compacted by static pressure or hammering of the prefabricated pile body.

In order to better show the specific flow of the carrier stiff composite pile, the embodiment provides a construction method of the carrier stiff composite pile, which includes the following steps:

firstly, forming holes according to the diameter of an outer pile body;

constructing a pile end carrier expanded head base, and firstly performing compactness control on the carrier expanded head base and compacted soil through three-level penetration in a carrier pile design rule;

thirdly, pouring an outer pile body on the composite pile body part;

fourthly, constructing an inner pile core through static pressure value or hammering penetration, and carrying out secondary compaction on the pile body outside the pile body and the soil body;

fifthly, secondary compaction of the carrier expansion head base is formed by constructing the inner pile core through static pressure value or hammering penetration.

Step S2 and step S5 are technical methods of controlling the penetration of the carrier expansion head and controlling the pressure value or penetration of the pile construction.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.