CN113216155A - Novel composite pile - Google Patents
Novel composite pile Download PDFInfo
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- CN113216155A CN113216155A CN202110612461.4A CN202110612461A CN113216155A CN 113216155 A CN113216155 A CN 113216155A CN 202110612461 A CN202110612461 A CN 202110612461A CN 113216155 A CN113216155 A CN 113216155A
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- 239000002131 composite material Substances 0.000 title claims abstract description 117
- 239000002689 soil Substances 0.000 claims abstract description 50
- 239000004567 concrete Substances 0.000 claims description 96
- 239000007787 solid Substances 0.000 claims description 89
- 239000004568 cement Substances 0.000 claims description 28
- 230000002787 reinforcement Effects 0.000 claims description 21
- 238000005507 spraying Methods 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 238000010276 construction Methods 0.000 abstract description 23
- 239000011435 rock Substances 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 abstract description 2
- 238000011065 in-situ storage Methods 0.000 description 17
- 238000005553 drilling Methods 0.000 description 10
- 238000001125 extrusion Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
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Abstract
The invention relates to a novel composite pile. The technical scheme is as follows: the novel composite pile consists of an inner core and an outer body, wherein part or all of the length of the inner core is concentrically wrapped by the outer body; the inner core is composed of an inner core main body and an expanding body which is integrally formed with the inner core main body at the outer edge of the inner core main body, and at least one section of the expanding body on the inner core is arranged in the length range of the inner core wrapped by the outer body. The novel composite pile has the advantages that the diameter expanding body is arranged between the inner core and the outer body, the combination is good, the stressed damaged surface of the composite pile is arranged on the interface of the maximum outer diameter of the pile, the perimeter of the pile body is increased, the mechanical property of the rock soil of the outer body is fully exerted, and the bearing capacity of the pile is greatly improved. The construction has no vibration, no noise, no slurry, low construction cost and high efficiency.
Description
Technical Field
The invention relates to a building foundation pile, in particular to a novel composite pile.
Background
In the foundation containing soft rock-soil layers, such as silt, mucky soil, cohesive soil, silt, sandy soil, artificial filling soil and the like, the bearing capacity of a single-pile type foundation pile can only be met by enlarging the pile diameter or increasing the pile length, so that the defects of high pile foundation cost, long construction period, large construction equipment investment and the like are caused. The application of the stiff composite pile effectively shortens the pile length and reduces the cost of the pile foundation. The inner core in the stiffness composite pile is mainly a prestressed concrete pipe pile with a smooth surface, the outer body around the inner core is a high-pressure rotary spraying cement paste stirring pile or a powder spraying cement powder stirring pile, although the high-pressure rotary spraying cement paste stirring pile or the powder spraying cement powder stirring pile enhances the binding force between the inner core and the outer body, in practical application, the inner core still has serious defects: in principle, when the inner core top bears the stress of a building, the pile side damage surface of the stiff composite pile is firstly positioned on the interface between the inner core and the outer body, and when the bonding force between the inner core and the outer body interface is enough, the pile side damage surface of the stiff composite pile is generated on the interface between the outer body and the soil around the pile, so that the stiff composite pile can only show the maximum advantage. When the pile test is carried out in the actual engineering, the pile side damage surface of the stiff composite pile is frequently generated at the interface between the inner core and the outer body, so that the function of the outer body is not fully exerted, the bearing capacity is not good, and the pile foundation cost is wasted.
Disclosure of Invention
In order to solve the technical problems, the invention provides a novel composite pile with better bonding strength between an inner core and an outer body and higher pile bearing capacity.
In order to achieve the purpose, the invention adopts the technical scheme that: a novel composite pile consists of an inner core and an outer body, wherein part or all of the length of the inner core is concentrically wrapped by the outer body; the inner core is composed of an inner core main body and an expanding body which is integrally formed with the inner core main body at the outer edge of the inner core main body, and at least one section of the expanding body on the inner core is arranged in the length range of the inner core wrapped by the outer body.
Preferably, in the novel composite pile, the inner core main body is a hollow cast-in-place concrete pipe pile.
Preferably, in the novel composite pile, the inner cavity of the hollow cast-in-place concrete pipe pile is wrapped with soil with the same type as the side soil of the pile at the same height position of the outer diameter of the hollow cast-in-place concrete pipe pile.
Preferably, in the novel composite pile, the inner core main body is a solid cast-in-place concrete solid pile.
Preferably, in the novel composite pile, the diameter-expanding body is a solid diameter-expanding body with an outer diameter larger than that of the inner core main body.
Preferably, in the novel composite pile, the diameter-enlarging body is a thread diameter-enlarging body which has an outer diameter larger than that of the inner core main body and is continuously wound on the outer edge of the inner core main body.
Preferably, the outer body of the novel composite pile is a mixing pile formed by high-pressure rotary spraying of cement paste or powder spraying of cement powder curing agent in-situ foundation soil.
Preferably, in the novel composite pile, the outer body is a cylinder with the same diameter.
Preferably, in the novel composite pile, the outer body is formed with an outer body expanding section at the outer edge thereof within the length range of the outer body wrapping the inner core.
Preferably, the novel composite pile comprises a steel reinforcement cage or not arranged in the inner core.
The beneficial effects of the invention are as follows:
1. the novel composite pile has the advantages that the diameter expanding body is arranged between the inner core and the outer body, the combination is good, the stressed damaged surface of the composite pile is arranged on the interface of the maximum outer diameter of the pile, the perimeter of the pile body is increased, the mechanical property of the rock soil of the outer body is fully exerted, and the bearing capacity of the pile is greatly improved.
2. The novel composite pile created by the invention can be used for arranging the diameter-expanding body on the inner core in the composite length of the non-outer body wrapped inner core in the foundation with large change of hardness and hardness of soil around the pile, thereby being beneficial to improving the bearing capacity of the pile.
3. After the outer body is formed, the inner core is formed by spirally extruding and drilling the pile hole of the cast-in-place concrete pile, the wall of the formed pile hole is extruded and compacted, inner core expanding body sections can be formed at different positions of the inner core, the design requirement of bearing capacity can be well met, and the side resistance of the inner core is improved.
4. The novel composite pile created by the invention has the advantages of no vibration, no noise, no slurry, low construction cost and high efficiency.
Drawings
Fig. 1 is a schematic structural view of a cast-in-place concrete pipe pile as an inner core main body in example 1.
Fig. 2 is a schematic structural view of a cast-in-place concrete pipe pile as an inner core main body in embodiment 2.
Fig. 3 is a schematic structural view of a cast-in-place concrete pipe pile as an inner core main body in example 3.
Fig. 4 is a schematic structural view of a cast-in-place concrete solid pile as a core main body in example 4.
FIG. 5 is a schematic structural view of a cast-in-place concrete solid pile as the core main body in example 5.
FIG. 6 is a schematic structural view of a cast-in-place concrete solid pile as an inner core main body in example 6.
FIG. 7 is a schematic structural view of a cast-in-place concrete solid pile as a core body in example 7.
FIG. 8 is a schematic structural view of a cast-in-place concrete solid pile as a core main body in example 8.
Fig. 9 is a schematic structural view of a cast-in-place concrete solid pile as a core main body in example 9.
Fig. 10 is a schematic view of the structure of a drill bit for implementing the core main body as a cast-in-place concrete pipe pile.
Fig. 11 is a side view of fig. 10.
Fig. 12 is a schematic structural view of a drill bit with a thread expanding body for implementing the inner core main body as the cast-in-place concrete pipe pile.
Detailed Description
Example 1
As shown in fig. 1, a novel composite pile is a fully-wrapped novel composite pile with an inner core main body of a cast-in-place concrete pipe pile.
The inner core main body is a novel full-wrapping composite pile of a cast-in-place concrete pipe pile 11 and comprises an inner core 10 and an outer body 20.
The entire length of the inner core 10 is concentrically surrounded by the outer body 20. In this embodiment, the length of the outer body 20 wrapped around the inner core 10 is referred to as the composite length between the inner core and the outer body. The composite length is L, the length of the inner core 10 is L1, and the length of the outer body 20 is L2, where L is L1 and L1< L2.
The inner core 10 is composed of an inner core main body and two expanding bodies which are integrally formed with the inner core main body at the outer edge of the inner core main body. In this embodiment, the inner core main part is hollow cast-in-place concrete tubular pile 11. The reducing body is a solid reducing body 13 with the outer diameter larger than that of the inner core main body.
Preferably, in one embodiment, the inner cavity of the hollow cast-in-place concrete pipe pile 11 is covered with soil with the same type as the soil on the side of the pile at the same height position as the outer diameter of the pile.
Preferably, in one embodiment, the inner core 10 contains a reinforcement cage 30.
The outer body 20 is a mixing pile formed by high-pressure rotary spraying of a curing agent such as cement paste or powder-sprayed cement powder into the foundation soil in situ.
Preferably, in one embodiment, the outer body 20 is a cylinder of constant diameter.
In this embodiment, assuming that the cast-in-place concrete pipe pile 11 has an outer diameter D, an inner diameter D2, the solid diameter-expanding body 13 has an outer diameter D1, and the outer body 20 has an outer diameter D, the following are provided: d is more than or equal to 700mm and less than or equal to 1500mm, D-D is 300-1000 mm, D1-D is 60-150 mm, and D-D2 is 300-700 mm.
Example 2
As shown in fig. 2, a novel composite pile is a fully-wrapped novel composite pile with an inner core main body of a cast-in-place concrete pipe pile.
The inner core main body is a novel full-wrapping composite pile of a cast-in-place concrete pipe pile 11 and comprises an inner core 10 and an outer body 20.
The entire length of the inner core 10 is concentrically surrounded by the outer body 20. In this embodiment, the length of the outer body 20 wrapped around the inner core 10 is referred to as the composite length between the inner core and the outer body. When the composite length is L, the length of the inner core 10 is L1, and the length of the outer body 20 is L2, L1 is L2.
The inner core 10 is composed of an inner core main body and two expanding bodies which are integrally formed with the inner core main body at the outer edge of the inner core main body. In this embodiment, the inner core main part is hollow cast-in-place concrete tubular pile 11. The reducing body is a solid reducing body 13 with the outer diameter larger than that of the inner core main body.
Preferably, in one embodiment, the inner cavity of the hollow cast-in-place concrete pipe pile 11 is covered with soil with the same type as the soil on the side of the pile at the same height position as the outer diameter of the pile.
Preferably, in one embodiment, the inner core 10 contains a reinforcement cage 30.
The outer body 20 is a mixing pile formed by high-pressure rotary spraying of a curing agent such as cement paste or powder-sprayed cement powder into the foundation soil in situ.
Preferably, in one embodiment, the outer body 20 is a cylinder of constant diameter.
In this embodiment, assuming that the cast-in-place concrete pipe pile 11 has an outer diameter D, an inner diameter D2, the solid diameter-expanding body 13 has an outer diameter D1, and the outer body 20 has an outer diameter D, the following are provided: d is more than or equal to 700mm and less than or equal to 1500mm, D-D is 300-1000 mm, D1-D is 60-150 mm, and D-D2 is 300-700 mm.
Example 3
As shown in fig. 3, a novel composite pile is a semi-wrapped novel composite pile with an inner core main body of a cast-in-place concrete pipe pile.
The inner core main body is a novel semi-wrapped composite pile of a cast-in-place concrete pipe pile 11 and comprises an inner core 10 and an outer body 20.
A partial length of the inner core 10 is concentrically wrapped by the outer body 20. In this embodiment, the length of the outer body 20 wrapped around the inner core 10 is referred to as the composite length between the inner core and the outer body. When the composite length is L, the length of the inner core 10 is L1, and the length of the outer body 20 is L2, L is L2, and L1> L2.
The inner core 10 is composed of an inner core main body and an expanding body which is formed in an integral structure with the inner core main body at the outer edge of the inner core main body. In this embodiment, the core main body is a hollow cast-in-place concrete pipe pile 11. The diameter-expanding body consists of an upper section and a lower section, the upper section is a thread diameter-expanding body 14 of which the outer diameter is larger than that of the inner core main body and is continuously wound on the outer diameter of the inner core main body, and the lower end is a solid diameter-expanding body 13 of which the outer diameter is larger than that of the inner core main body. The thread step-up body 14 is disposed mostly within the composite length between the inner core and the outer body.
Preferably, in one embodiment, the inner cavity of the hollow cast-in-place concrete pipe pile 11 is covered with soil with the same type as the soil on the side of the pile at the same height position as the outer diameter of the pile.
The outer body 20 is a mixing pile formed by high-pressure rotary spraying of a curing agent such as cement paste or powder-sprayed cement powder into the foundation soil in situ.
Preferably, in one embodiment, the outer body 20 is a cylinder of constant diameter.
In this embodiment, assuming that the cast-in-place concrete pile 11 has an outer diameter D, an inner diameter D2, the solid diameter-expanding body 13 has an outer diameter D1, the thread diameter-expanding body 14 has an outer diameter D3, and the outer body 20 has an outer diameter D, the following components are included: d1 is D3, D is more than or equal to 700mm and less than or equal to 1500mm, D-D is 300-1000 mm, D1-D is 60-150 mm, and D-D2 is 300-700 mm.
Example 4
As shown in fig. 4, a novel composite pile is a fully-wrapped novel composite pile with an inner core main body being a cast-in-place concrete solid pile.
The inner core main body is a novel full-wrapping composite pile of a cast-in-place concrete solid pile 12 and comprises an inner core 10 and an outer body 20.
The entire length of the inner core 10 is concentrically surrounded by the outer body 20. In this embodiment, the length of the outer body 20 wrapped around the inner core 10 is referred to as the composite length between the inner core and the outer body. The composite length is L, the length of the inner core 10 is L1, and the length of the outer body 20 is L2, where L is L1 and L1< L2.
The inner core 10 is composed of an inner core main body and two expanding bodies which are integrally formed with the inner core main body at the outer edge of the inner core main body. In this embodiment, the core body is a solid cast-in-place concrete solid pile 12. The reducing body is a solid reducing body 13 with the outer diameter larger than that of the inner core main body.
Preferably, in one embodiment, the inner core 10 contains a reinforcement cage 30.
The outer body 20 is a mixing pile formed by high-pressure rotary spraying of a curing agent such as cement paste or powder-sprayed cement powder into the foundation soil in situ.
Preferably, in one embodiment, the outer body 20 is a cylinder of constant diameter.
In this embodiment, if the outer diameter of the cast-in-place concrete solid pile 11 is D, the outer diameter of the solid diameter-enlarging body 13 is D1, and the outer diameter of the outer body 20 is D, the following are provided: d is more than or equal to 220mm, D-D is 300-1000 mm, and D1-D is 60-150 mm.
Example 5
As shown in fig. 5, a novel composite pile is a semi-wrapped novel composite pile with an inner core main body being a cast-in-place concrete solid pile.
The inner core main body is a novel semi-wrapped composite pile of a cast-in-place concrete solid pile 12 and comprises an inner core 10 and an outer body 20.
A partial length of the inner core 10 is concentrically wrapped by the outer body 20. In this embodiment, the length of the outer body 20 wrapped around the inner core 10 is referred to as the composite length between the inner core and the outer body. The composite length is set to L, the length of the inner core 10 is set to L1, and the length of the outer body 20 is set to L2, so that L1 is greater than L, and L2 is greater than L.
The inner core 10 is composed of an inner core main body and two expanding bodies which are integrally formed with the inner core main body at the outer edge of the inner core main body. In this embodiment, the core body is a solid cast-in-place concrete solid pile 12. The reducing body is a solid reducing body 13 with the outer diameter larger than that of the inner core main body. The two sections of solid diameter-enlarging bodies 13 are both arranged in the composite length between the inner core and the outer body.
Preferably, in one embodiment, the inner core 10 contains a reinforcement cage 30.
The outer body 20 is a mixing pile formed by high-pressure rotary spraying of a curing agent such as cement paste or powder-sprayed cement powder into the foundation soil in situ.
Preferably, in one embodiment, the outer body 20 is a cylinder of constant diameter.
In this embodiment, if the outer diameter of the cast-in-place concrete solid pile 11 is D, the outer diameter of the solid diameter-enlarging body 13 is D1, and the outer diameter of the outer body 20 is D, the following are provided: d is more than or equal to 220mm, D-D is 300-1000 mm, and D1-D is 60-150 mm.
Example 6
As shown in fig. 6, a novel composite pile is a fully-wrapped novel composite pile with an inner core main body being a cast-in-place concrete solid pile.
The inner core main body is a novel full-wrapping composite pile of a cast-in-place concrete solid pile 12 and comprises an inner core 10 and an outer body 20.
The entire length of the inner core 10 is concentrically surrounded by the outer body 20. In this embodiment, the length of the outer body 20 wrapped around the inner core 10 is referred to as the composite length between the inner core and the outer body. When the composite length is L, the length of the inner core 10 is L1, and the length of the outer body 20 is L2, L1 is L2.
The inner core 10 is composed of an inner core main body and an expanding body which is formed in an integral structure with the inner core main body at the outer edge of the inner core main body. In this embodiment, the core body is a solid cast-in-place concrete solid pile 12. The diameter-expanding body consists of an upper section and a lower section, the upper section is a thread diameter-expanding body 14 of which the outer diameter is larger than that of the inner core main body and is continuously wound on the outer diameter of the inner core main body, and the lower end is a solid diameter-expanding body 13 of which the outer diameter is larger than that of the inner core main body.
Preferably, in one embodiment, the inner core 10 contains a reinforcement cage 30.
The outer body 20 is a mixing pile formed by high-pressure rotary spraying of a curing agent such as cement paste or powder-sprayed cement powder into the foundation soil in situ.
Preferably, in one embodiment, an outer body expanding section 21 is formed at the outer edge of the middle portion of the outer body 20.
In this embodiment, if the outer diameter of the cast-in-place concrete solid pile 11 is D, the outer diameter of the solid diameter-enlarging body 13 is D1, the outer diameter of the thread diameter-enlarging body 14 is D3, the outer diameter of the outer body 20 is D, and the outer diameter of the outer body diameter-enlarging section 21 is D1, then: d is more than or equal to 220mm, D-D is 300-1000 mm, D1-D is 60-150 mm, D1-D is 200-600 mm, and D3-D is 60-150 mm.
Example 7
As shown in fig. 7, a novel composite pile is a semi-wrapped novel composite pile with an inner core main body being a cast-in-place concrete solid pile.
The inner core main body is a novel semi-wrapped composite pile of a cast-in-place concrete solid pile 12 and comprises an inner core 10 and an outer body 20.
A partial length of the inner core 10 is concentrically wrapped by the outer body 20. In this embodiment, the length of the outer body 20 wrapped around the inner core 10 is referred to as the composite length between the inner core and the outer body. When the composite length is L, the length of the inner core 10 is L1, and the length of the outer body 20 is L2, L is L2, and L1> L2.
The inner core 10 is composed of an inner core main body and an expanding body which is formed in an integral structure with the inner core main body at the outer edge of the inner core main body. In this embodiment, the core body is a solid cast-in-place concrete solid pile 12. The diameter expander consists of an upper section and a lower section, the upper section is a thread diameter expander 14 of which the outer diameter is larger than that of the inner core main body and is continuously wound on the outer diameter of the inner core main body, and the lower section is a solid diameter expander 13 of which the outer diameter is larger than that of the inner core main body. The thread reamer 14 is disposed within the composite length between the inner core and the outer body.
Preferably, in one embodiment, the inner core 10 contains a reinforcement cage 30.
The outer body 20 is a mixing pile formed by high-pressure rotary spraying of a curing agent such as cement paste or powder-sprayed cement powder into the foundation soil in situ.
Preferably, in one embodiment, the outer body 20 is a cylinder of constant diameter.
In this embodiment, if the outer diameter of the cast-in-place concrete solid pile 11 is D, the outer diameter of the solid diameter-enlarging body 13 is D1, the outer diameter of the thread diameter-enlarging body 14 is D3, and the outer diameter of the outer body 20 is D, then: d is more than or equal to 220mm, D-D is 300-1000 mm, D1-D is 60-150 mm, D1-D is 200-600 mm, and D3-D is 60-150 mm.
Example 8
As shown in fig. 8, a novel composite pile is a fully-wrapped novel composite pile with an inner core main body being a cast-in-place concrete solid pile.
The inner core main body is a novel full-wrapping composite pile of a cast-in-place concrete solid pile 12 and comprises an inner core 10 and an outer body 20.
The entire length of the inner core 10 is concentrically surrounded by the outer body 20. In this embodiment, the length of the outer body 20 wrapped around the inner core 10 is referred to as the composite length between the inner core and the outer body. The composite length is L, the length of the inner core 10 is L1, and the length of the outer body 20 is L2, where L is L1 and L1< L2.
The inner core 10 is composed of an inner core main body and an expanding body which is formed in an integral structure with the inner core main body at the outer edge of the inner core main body. In this embodiment, the core body is a solid cast-in-place concrete solid pile 12. The expander is a thread expander 14 with an outer diameter larger than that of the inner core main body and continuously wound on the outer diameter of the inner core main body.
Preferably, in one embodiment, the inner core 10 contains a reinforcement cage 30.
The outer body 20 is a mixing pile formed by high-pressure rotary spraying of a curing agent such as cement paste or powder-sprayed cement powder into the foundation soil in situ.
Preferably, in one embodiment, the outer body 20 is a cylinder of constant diameter.
In this embodiment, if the outer diameter of the cast-in-place concrete solid pile 11 is D, the outer diameter of the thread expansion body 14 is D3, and the outer diameter of the outer body 20 is D, the following are provided: d is more than or equal to 220mm, D-D is 300-1000 mm, and D3-D is 60-150 mm.
Example 9
As shown in fig. 9, a novel composite pile is a fully-wrapped novel composite pile with an inner core main body being a cast-in-place concrete solid pile.
The inner core main body is a novel full-wrapping composite pile of a cast-in-place concrete solid pile 12 and comprises an inner core 10 and an outer body 20.
The entire length of the inner core 10 is concentrically surrounded by the outer body 20. In this embodiment, the length of the outer body 20 wrapped around the inner core 10 is referred to as the composite length between the inner core and the outer body. When the composite length is L, the length of the inner core 10 is L1, and the length of the outer body 20 is L2, L1 is L2.
The inner core 10 is composed of an inner core main body and an expanding body which is formed in an integral structure with the inner core main body at the outer edge of the inner core main body. The inner core main body is a solid cast-in-place concrete solid pile 12. The reducing body is a thread reducing body 14 with an outer diameter larger than that of the inner core main body and continuously wound on the outer diameter of the inner core main body, the thread reducing body 14 is arranged at the upper end of the inner core main body, and the lower end of the inner core main body is a smooth cylinder.
The outer body 20 is a mixing pile formed by high-pressure rotary spraying of a curing agent such as cement paste or powder-sprayed cement powder into the foundation soil in situ.
Preferably, in one embodiment, an outer body expanding section 21 is formed at an outer edge of the outer body 20, and the outer body expanding section 21 is provided at a lower end portion of the composite length.
In this embodiment, if the outer diameter of the cast-in-place concrete solid pile 11 is D, the outer diameter of the thread expansion body 14 is D3, the outer diameter of the outer body 20 is D, and the outer diameter of the outer body expanded diameter section 21 is D1, then: d is more than or equal to 220mm, D-D is 300-1000 mm, D3-D is 60-150 mm, and D1-D is 200-600 mm.
The invention creates a novel composite pile, which has the advantages of the principle of combination between an inner core and an outer body and the bearing capacity of the pile:
according to an estimation formula related to the characteristic value of the vertical compression bearing capacity between the inner core and the outer body interface of the composite section of the flexible-rigid composite pile in JGJ/T327-2014 technical Specification of stiff composite piles:
Qsk＝uqsal
in the formula, u: the perimeter (m) of the inner core pile body;
qsa: the characteristic value (Kpa) of the resistance of the inner core side of the composite section of the stiff composite pile is related to the geotechnical parameters of the outer body;
l: the composite length (m) of the inner core and the outer body.
In the composite length section between the inner core and the outer body, the vertical compression bearing capacity between the inner core and the outer body interface is mainly embodied as the friction between the inner core and the outer body interface, and the outer surface of the inner core of the stiff composite pile is cylindrical and mainly made of a prestressed pipe pile, the surface is smooth, so that the improvement of the friction between the inner core and the outer body interface is not facilitated, the bonding force between the inner core and the outer body is insufficient, the damaged surface of the stiff composite pile during vertical compression bearing capacity is generated on the interface between the inner core and the outer body, the inner core and the outer body cannot be fixed into a whole, the full play of the mechanical action of the reinforced outer body rock soil is influenced, and the waste is caused.
The combination between the inner core and the outer body of the novel composite pile is in a convex-concave matching structure, and the convex inner core expanding body is embedded in the outer body, so that the inner core and the outer body are organically combined into a whole. When the inner core top is stressed by vertical force, friction force is reflected between the inner core and the outer body interface, and vertical extrusion force of the convex-concave matched radial end face is also generated, so that the vertical compression resistance between the inner core and the outer body is increased. Particularly, in the composite length range between the inner core and the outer body, the inner core diameter-expanding body is a screw tooth diameter-expanding body, in the area of the screw tooth diameter-expanding body section, the inner core and the outer body are in threaded fit in the pile length direction, when the inner core is subjected to a vertical force, a damaged surface between the inner core and the outer body is generated on the outer diameter interface of the screw tooth diameter-expanding body section, the friction force between the outer body and the inner core interface is converted into the rock-soil shearing force of the outer body on the outer diameter interface of the screw tooth diameter-expanding body, the inner friction angle of the rock-soil of the outer body is larger than the friction angle between the inner core (concrete) and the outer body, and the rock-soil shearing force of the outer body is larger than the friction force between the outer body and the inner core (concrete) according to a coulomb formula; the solid diameter-expanding body in the composite length range is formed by extruding, compacting, expanding and pressure-filling the inner core main body pile hole wall again, and the side friction resistance is further improved. In the compound length scope, the inner core main part is for cast in situ concrete tubular pile, has frictional resistance between the internal surface of tubular pile and the ground of wrapping up, also is favorable to compound length inner tubular pile bearing load vertical compressive capacity's improvement.
The novel composite pile has high bonding strength between the inner core and the outer body, and when the top of the inner core is under the action of vertical pressure, the pile side damage surface of the novel composite pile occurs on the interface between the outer body and the soil around the pile, so that the perimeter of the pile body is greatly increased, and the bearing capacity of the composite pile is improved.
The outer body of the novel composite pile is provided with the outer body expanding section within the composite length range, so that new end resistance is added, and the bearing capacity value of the composite pile is improved.
The novel composite pile implementation process created by the invention comprises the following steps:
according to the geological survey data and the design requirements of bearing of the engineering pile, the soft rock soil layer is stirred by curing agents such as high-pressure rotary-spraying cement paste or powder-spraying cement powder and the like to form an outer body, and the construction of the inner core is carried out within 6 hours after the construction of the outer body. Different construction methods are adopted for the inner cores of various pile types in the embodiments 1 to 9.
In the embodiment 1 and the embodiment 2, the main body of the inner core is the cast-in-place concrete tubular pile 11, wherein the inner core in the embodiment 1 is completely arranged in the outer body, the outer body is superposed with the top surface of the inner core, namely L1< L2, two sections of solid diameter-enlarging bodies are arranged in the middle of the inner core, in the composite length between the inner core and the outer body, the outer body and the inner core are combined and fixed into a whole through the reinforcement of the two sections of solid diameter-enlarging bodies, and the outer edge of the outer body is a constant-diameter cylinder. The inner core of example 2 is completely arranged in the outer body, that is, L1-L2, the bottom end and the middle part of the inner core are respectively provided with a section of solid diameter-expanding body, in the composite length between the inner core and the outer body, the outer body and the inner core are combined and fixed into a whole through the reinforcement of two sections of solid bodies, and the outer edge of the outer body is an isometric body. The construction of the inner core adopts the drill bit construction shown in fig. 10 and fig. 11, the drill bit inner pipe 1 is hollow and permeable, the inner diameter of the drill bit inner pipe is d2, the outer edge of the lower end of the inner pipe is a frustum body, the spiral soil-squeezing blades 3 are wound on the outer surface of the inner pipe 1, the concrete conveying pipe 4 is arranged outside the inner pipe, the concrete passage opening 5 is obliquely arranged, and the passage door 6 is provided with an opening angle within a certain range. The drill bit is combined with a matched pile machine, when the inner core main body pile hole is formed by spirally extruding soil, the concrete passage opening 5 is closed by the passage door 6, the drill bit performs soil extrusion drilling, most part of rock soil of the outer pile hole position of the inner pipe hole of the drill bit is extruded to the pile hole wall, the hole wall is compacted, the rock soil in the inner pipe hole cavity of the drill bit is remained in the hole cavity in a columnar shape, after the inner core main body pile hole is drilled to the designed depth, the drill bit rotating in the drilling direction is lifted, concrete is poured under pressure, the concrete opens the concrete passage opening 5, and the concrete is injected into the hole cavity of the inner core main body pile to form an inner core main; lifting a drill and performing pressure filling to the top height of the first section solid expanded diameter body section at the bottom end part of the cast-in-place concrete pipe pile, stopping lifting the drill and performing pressure filling, downward drilling for extruding concrete in the pipe cavity, closing a concrete passage opening 5 by a passage door 6 under the action of pressure concrete, extruding the compressed concrete to the outer rock wall in the adjacent annular hole cavity under the rotary extrusion action of the lower end part of a drill bit, expanding the inner cavity of a rock-soil hole, remaining most of the compressed concrete in the expanded rock-soil annular hole cavity, performing extrusion drilling until the compressed concrete is drilled to the bottom height of the solid expanded diameter body section, stopping drilling, lifting the drill and performing pressure filling with concrete, integrating the newly injected concrete and the concrete remaining in the expanded hole cavity into a whole, lifting the drill and performing pressure filling to the top height of the solid body section, and completing the construction of the first section solid body section at the bottom end of the pile; and (4) repeating the construction of the inner core main body cast-in-situ tubular pile and the solid body section, then continuously lifting the drill and performing pressure irrigation to the top of the cast-in-situ tubular pile, and arranging a reinforcement cage behind the cast-in-situ tubular pile to form the inner core pile.
Example 3 the inner core main body is a cast-in-place concrete pipe pile. The inner core is partially arranged in the outer body, namely L1 is larger than L2, the lower end part of the inner core is provided with a solid diameter-expanding body 13, the other part of the inner core is provided with a threaded diameter-expanding body 14, the outer body is superposed with the top surface of the inner core, in the composite length between the inner core and the outer body, the outer body and the inner core are combined and fixed into a whole through the reinforcement of the threaded diameter-expanding body 14, and the outer edge of the outer body is an equal-diameter cylinder. The construction of the inner core adopts the drill bit construction shown in fig. 12, the drill bit shown in fig. 12 is basically the same as the drill bit shown in fig. 10, the difference is that a fixed reaming block 7 (or 2 fixed reaming blocks can be symmetrically arranged) is arranged at the outer edge of the spiral soil-squeezing blade 3 at the bottom end of the drill bit, the external extension of the reaming block 7 is delta, delta is 30-75 mm, the construction process of a pile-forming and solid diameter-expanding section is basically the same as the pile type of the embodiment 1 and the embodiment 2, the difference is that when the drill bit rotating in the drilling direction is lifted and concrete is pressure-poured, the reaming block 7 on the drill bit forms a spiral groove in the outer wall of the pile hole, the groove and the annular inner core main body pile hole are poured together, the drill bit is lifted and pressure-poured to the top end of the pile, the formed inner core main body is a cast-in-place pipe pile, the outer surface bottom end of the outer surface is a solid section, and the rest is a pile type which is a spiral wound thread and is integrated with the cast-in-place pipe pile.
Example 4-example 9, the core body was a cast-in-place concrete solid pile. The inner core of the pile in the embodiment 4 is arranged in the part of the outer body, the outer body is overlapped with the top surface of the inner core, namely L1 is less than L2, the bottom end and the middle part of the inner core are respectively provided with a section of solid expanding body, in the composite length between the inner core and the outer body, the outer body and the inner core are combined and fixed into a whole through the reinforcement of two sections of solid bodies, and the outer edge of the outer body is an isometric column. In the pile of embodiment 5, part of the inner core is arranged in the outer body, the top surface of the outer body is lower than that of the inner core, the bottom end and the middle part of the inner core are respectively provided with a section of solid diameter expanding body, the outer body and the inner core are combined into a whole through the reinforcement of two sections of solid bodies in the composite length between the inner core and the outer body, and the outer edge of the outer body is a cylinder with the same diameter. The inner core of the pile in example 6 is arranged in the outer body, that is, L1 is L2, the bottom end of the inner core is provided with a section of solid diameter-enlarging body, the middle part of the inner core is provided with a section of threaded diameter-enlarging body, in the composite length between the inner core and the outer body, the outer body and the inner core are combined and fixed into a whole through the reinforcement of the section of solid diameter-enlarging body and the section of threaded diameter-enlarging body, and the outer body is a combination body of which the middle part of the outer edge is provided with the diameter-enlarging section of the outer body. The part of the inner core of the pile in example 7 is arranged in the outer body, L1 is more than L2, the bottom end of the inner core is provided with a section of solid diameter-enlarging body, the middle upper part of the inner core is provided with a section of threaded diameter-enlarging body, the inner core is coincided with the top surface of the outer body, in the composite length between the inner core and the outer body, the outer body and the inner core are combined and fixed into a whole through the reinforcement of the threaded body, and the outer edge of the outer body is a cylinder with the same diameter. The inner core of the pile in the embodiment 8 is arranged in the outer body, L1 is less than L2, the outer surface of the inner core is provided with the threaded diameter-enlarging body, the inner core is superposed with the top surface of the outer body, the outer body and the inner core are combined into a whole through the reinforcement of the threaded diameter-enlarging body in the composite length between the inner core and the outer body, and the outer edge of the outer body is a cylinder with the same diameter. The construction process of the inner core comprises the following steps: the lower end part of the drill bit is of a cone structure and has a soil extrusion function, a drill bit door is provided with an opening angle within a certain range, the inner cavity of the drill bit is provided with an adjusting mechanism of a hole expanding block, the screwing-out quantity delta of the hole expanding block is controlled to be 0-75 mm, when the drill bit and a matched pile machine are used for performing soil extrusion drilling, the screwing-out quantity delta of the hole expanding block is 0, the drill bit door closes a concrete passage port, most rock soil of a pile hole position is extruded to the side wall of the inner core main body pile hole by the lower end part of the drill bit, the rock soil of a compact hole wall forms an inner core main body pile hole, the drilling is completed until the design depth is stopped, the drill bit which continuously rotates is lifted and concrete is pressed into the inner core main body pile hole, and the construction of the inner core main body pile section is completed, namely, the cast-in-place concrete solid pile is formed; according to the design requirement of the expanding body in the inner core, the pile sections are constructed upwards section by section from the pile bottom; 1) construction of a solid expanded-diameter body section: lifting the drill bit and pressure-filling to the top height of the solid expanded-diameter body section, stopping lifting the drill bit and pressure-filling, downward releasing the drill bit to press the concrete in the cast-in-place concrete solid pile hole to drill, closing the concrete passage port of the drill bit under the action of the pressure concrete at the lower surface of the drill bit door, transferring the force of the pressed concrete to the adjacent rock-soil hole wall, extruding and expanding the inner cavity of the rock-soil hole, remaining most of the concrete in the expanded rock-soil hole cavity, pressing the concrete to drill to the bottom height of the solid body section, stopping drilling, lifting the drill bit which continuously rotates and pressure-filling the concrete, melting the newly injected concrete and the concrete remaining in the expanded rock-soil hole cavity into a whole, lifting the drill bit and pressure-filling to the top height of the solid expanded-diameter body section, and completing the construction of the solid body section. 2) Construction of the thread expanding body section: and continuously lifting the drill bit and pressure-filling to the bottom height of the thread body section, driving the drill bit reaming block to screw out, extruding the reaming block into the hole wall of the cast-in-situ solid pile, lifting the drill bit and pressure-filling to the top height of the thread body section, withdrawing the reaming block and completing the construction of the thread body section, wherein the reaming block is arranged in the effective burial depth of the drill bit during the filling process and extrudes the groove extruded by the reaming block and the cast-in-situ solid pile hole to be filled together. Repeating the construction of the rest diameter-expanded body section according to the design requirement of the diameter-expanded body in the inner core pile; and continuously lifting the drill and performing pressure irrigation until the cast-in-situ solid pile is jacked, and arranging a reinforcement cage to form the inner core pile. Example 9 pile type, the inner core body is a cast-in-place plain concrete solid pile. The inner core is arranged in the outer body, namely L1-L2, the middle upper part of the inner core is provided with a diameter expanding body of a thread body, the outer body and the inner core are combined and fixed into a whole through the reinforcement of the thread body in the composite length between the inner core and the outer body, and the outer edge of the outer body is a combination body of which the bottom end part is provided with an outer body diameter expanding section; the construction process of the inner core is as described above, and the difference is that the formed inner core pile does not need to be embedded into a reinforcement cage.
Claims (10)
1. A novel composite pile is composed of an inner core (10) and an outer body (20), and is characterized in that part or the whole length of the inner core (10) is concentrically wrapped by the outer body (20); the inner core (10) is composed of an inner core main body and an expanding body which is integrally formed with the inner core main body at the outer edge of the inner core main body, and at least one section of the expanding body on the inner core is arranged in the length range of the inner core (10) wrapped by the outer body (20).
2. A new composite pile as claimed in claim 1, characterised in that the core body is a hollow cast-in-place concrete pipe pile (11).
3. The novel composite pile of claim 2, characterized in that the inner cavity of the hollow cast-in-place concrete pipe pile (11) is wrapped with soil of the same type as the side soil of the pile at the same height position of the outer diameter.
4. A novel composite pile as claimed in claim 1, characterised in that the core body is a solid cast in place concrete solid pile (12).
5. A novel composite pile according to any one of claims 1 to 4, characterised in that the said expander is a solid expander (13) having an outer diameter greater than the outer diameter of the main body of the inner core.
6. A novel composite pile according to any one of claims 1 to 4, characterised in that the expander is a thread expander (14) having an outer diameter greater than the outer diameter of the core body and continuously wound around the outer periphery of the core body.
7. A new composite pile according to any one of claims 1-4, characterised in that the outer body (20) is a mixing pile formed by high pressure rotary-spraying cement paste or powder-spraying cement powder curing agent in the foundation soil.
8. A new composite pile according to any one of claims 1-4, characterised in that the outer body (20) is a cylinder of constant diameter.
9. A novel composite pile according to any one of claims 1 to 4, characterised in that the outer body (20) is formed with an outer body expanded diameter section (21) at the outer edge of the outer body (20) over the length of the outer body (20) surrounding the inner core (10).
10. A novel composite pile according to any one of claims 1 to 4, characterised in that the inner core (10) may or may not contain reinforcement cages (30).
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| CN202110612461.4A CN113216155A (en) | 2021-06-02 | 2021-06-02 | Novel composite pile |
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| CN202110612461.4A CN113216155A (en) | 2021-06-02 | 2021-06-02 | Novel composite pile |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106284329A (en) * | 2016-10-18 | 2017-01-04 | 上海强劲地基工程股份有限公司 | A kind of stiff composite pile of abnormity |
| CN107023002A (en) * | 2016-08-30 | 2017-08-08 | 北京荣创岩土工程股份有限公司 | Down-the-hole impacts churning composite pile pile making method |
| CN214883586U (en) * | 2021-06-02 | 2021-11-26 | 刘守进 | Novel composite pile |
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2021
- 2021-06-02 CN CN202110612461.4A patent/CN113216155A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023002A (en) * | 2016-08-30 | 2017-08-08 | 北京荣创岩土工程股份有限公司 | Down-the-hole impacts churning composite pile pile making method |
| CN106284329A (en) * | 2016-10-18 | 2017-01-04 | 上海强劲地基工程股份有限公司 | A kind of stiff composite pile of abnormity |
| CN214883586U (en) * | 2021-06-02 | 2021-11-26 | 刘守进 | Novel composite pile |
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Application publication date: 20210806 |