CN114718056A - Superfluid state solidified soil cast-in-place pile and production method thereof - Google Patents
Superfluid state solidified soil cast-in-place pile and production method thereof Download PDFInfo
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- CN114718056A CN114718056A CN202210331376.5A CN202210331376A CN114718056A CN 114718056 A CN114718056 A CN 114718056A CN 202210331376 A CN202210331376 A CN 202210331376A CN 114718056 A CN114718056 A CN 114718056A
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- 239000000378 calcium silicate Substances 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
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- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
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- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The application discloses superfluid solidified soil cast-in-place pile and production method thereof, superfluid solidified soil cast-in-place pile includes: the protective cylinder is internally limited with an accommodating space; the middle lower part of the reinforcement cage is positioned in the accommodating space, the reinforcement cage comprises a plurality of longitudinal bars and a plurality of stirrups, each longitudinal bar extends along a first direction, the plurality of longitudinal bars form a cylindrical structural member with a channel, each stirrup is annularly arranged on the periphery or the inner periphery of the cylindrical structural member, the plurality of stirrups are distributed at intervals along the first direction, and each stirrup extends along a second direction; the pile body is a cylindrical piece and comprises a concrete layer extending along a first direction, and the concrete layer comprises a base material, a hydrate and a stone framework, wherein the hydrate and the stone framework are generated by the reaction of an inorganic hydraulic cementing material and the base material and/or water in a water environment. The superfluid state solidified soil cast-in-place pile of this application can guarantee the mobility of intensity and raw materials.
Description
Technical Field
The application belongs to the technical field of cast-in-place piles, and particularly relates to a superfluid solidified soil cast-in-place pile and a production method thereof.
Background
The pile foundation is an ancient foundation type, the pile foundation technology has undergone the development process for thousands of years, the development of pile foundation materials and pile types, or construction machinery and construction methods is huge, a modern foundation engineering system is formed, the pile foundation type of large buildings and high-rise buildings mainly comprises a pipe pile and a concrete cast-in-place pile, and a plurality of composite pile types are gradually mature, such as stiff composite piles. Because the deep soil layer contains abundant underground water, various cementing materials can not form a high-strength pile body in the underground water, and only the concrete filling pile and the tubular pile avoid the influence of the underground water.
In the process of foundation treatment, particularly soft foundation treatment, more stirring piles and high-pressure jet grouting piles are mainly used, the aim is to mix cement paste and an in-situ soil body together for solidification, the soil pressure and the water pressure are gradually increased along with the increase of the pile length, the pile forming efficiency is lower and lower, the deep pile forming effect is poorer and poorer, the main reason is that the cement is difficult to be strengthened in a lower water-saturated soil layer, the final strength is lower, and much or even no strength exists.
Disclosure of Invention
An object of the present application is to provide a superfluid solidified soil cast-in-place pile and a method for manufacturing the same, which can solve at least one of the problems of the background art.
According to a first aspect of the present application, there is provided a superfluid solidified soil cast-in-place pile including: the protective cylinder is internally limited with an accommodating space; the middle lower part of the reinforcement cage is located in the accommodating space, the reinforcement cage comprises a plurality of longitudinal ribs and a plurality of stirrups, each longitudinal rib extends along a first direction, the plurality of longitudinal ribs form a cylindrical structural member with a channel, each stirrup is annularly arranged on the periphery or the inner periphery of the cylindrical structural member, the plurality of stirrups are distributed at intervals along the first direction, and each stirrup extends along a second direction; the pile body is a cylindrical piece and comprises a base material, and a hydrate and a stone skeleton which are generated by the reaction of an inorganic hydraulic cementing material and the base material and/or water in a water environment.
According to an embodiment of the application, the internal surface and the surface of protecting a section of thick bamboo are equipped with first hydrophobic layer, the outside coating of indulging the muscle has the second hydrophobic layer indulge the muscle is kept away from one side of stirrup is equipped with the edge the slide that the first direction extends be equipped with the edge on the slide mobilizable mud jacking piece of first direction.
According to an embodiment of the application, the pile body comprises a first concrete layer and a second concrete layer, the first concrete layer and the second concrete layer are sequentially distributed on the pile body from the central axis of the pile body along the radial direction, the first concrete layer and the second concrete layer respectively comprise a base material, the second concrete layer at least comprises ceramsite, the density of the ceramsite in the second concrete layer is larger than that of the ceramsite in the first concrete layer, and the density of hydrate and stone skeleton in the first concrete layer is larger than that of hydrate and stone skeleton in the second concrete layer.
According to one embodiment of the application, the cross section of the pile body is circular, and the density of the hydrate and the stone skeleton in the range that the circular shape is concentric circles is the same.
According to an embodiment of the application, the outer peripheral face of pile body divide into first side and second side along circumference, the cross section of pile body divide into first region and second area, first region with first side corresponds, the second area with the second side corresponds the water content of the environment that first side corresponds is greater than when the water content of the environment that the second side corresponds, perhaps when the water impact force of the environment that first side corresponds is greater than the water impact force of the environment that the second side corresponds, the density of haydite in the first region is greater than in the second area the density of haydite, in the first region the density of hydrate and stone skeleton is less than in the second region the density of hydrate and stone skeleton.
According to one embodiment of the application, the aperture of the ceramsite close to the self central axis of the pile body is larger than that of the ceramsite close to the peripheral surface of the pile body.
According to one embodiment of the application, the aperture of the ceramsite close to the central axis of the pile body is smaller than that of the ceramsite close to the peripheral surface of the pile body, and the inside of the microporous structure of the ceramsite close to the peripheral surface of the pile body is provided with hydrophobic groups.
According to an embodiment of the application, the pile body further comprises: a first matrix having a density less than a density of the base stock; a second matrix having a density greater than a density of the base material, the second matrix having an adhesion with the stone skeleton.
According to the second aspect of the application, a method for producing a superfluid solidified soil cast-in-place pile is provided, which comprises the following steps: s1, embedding a pile casing at the pile hole position; s2, hanging the reinforcement cage in the accommodating space of the pile casing; s3, grouting mud into the channel in the reinforcement cage to form a pile body, wherein the pile body is the pile body according to any one of claims 1-8; wherein, in step S3, the binder and the inorganic hydraulic binder are mixed, the inorganic hydraulic binder being capable of reacting with moisture to form a hydrate and a stone skeleton.
According to one embodiment of the present application, the inorganic hydraulic binder comprises a first inorganic hydraulic binder, the periphery of which is not coated with a slow release layer, and a second inorganic hydraulic binder, the periphery of which is coated with a slow release layer, said slow release layer being capable of reacting with water.
According to one embodiment of the disclosure, the pile body strength of the pile body of the superfluid solidified soil cast-in-place pile in 28 days is 0.5-10 MPa, the mixing proportion can be adjusted according to the slurry property and the design requirement, and the components and the content are adjusted to ensure the strength and the fluidity of the pile body. The superfluid solidified soil cast-in-place pile not only can not produce waste residue and waste liquid, but also can utilize waste slurry or waste soil, has consideration to environmental protection, new materials and new processes, is a new choice of a foundation form of a building in an area with abundant underground water, and can be used for foundation reinforcement, composite pile foundations, engineering piles and the like.
Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic cross-sectional view of a piling of one embodiment provided herein;
FIG. 2 is a schematic cross-sectional view of a piling of yet another embodiment provided herein;
fig. 3 is a flowchart of a method for producing a superfluid solidified soil cast-in-place pile according to an embodiment of the present disclosure.
Reference numerals
A first concrete layer 11; a second concrete layer 12; a first region 13; a second region 14.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The superfluid state solidified soil cast-in-place pile according to the embodiment of the application is described below with reference to the accompanying drawings.
The superfluid state solidified soil cast-in-place pile comprises a pile casing, a reinforcement cage and a pile body.
Particularly, be injectd in the casing and have accommodating space, steel reinforcement cage's well lower part is located accommodating space, steel reinforcement cage includes a plurality of vertical muscle and a plurality of stirrup, every vertical muscle extends along the first direction, the cylindricality structure that has the passageway is constituteed to a plurality of vertical muscle, every stirrup ring is established in the periphery or the internal periphery of cylindricality structure, a plurality of stirrups are along first direction spaced apart distribution, every stirrup extends along the second direction, the passageway is located to the pile body, the pile body is the cylindricality piece, the pile body includes the concrete layer that extends along the first direction, the concrete layer includes the matrix and takes place the reaction through moisture in inorganic hydraulic cementing material and the matrix and/or the water environment and produce hydrate and stone skeleton.
In other words, the superfluid solidified soil cast-in-place pile mainly comprises a pile casing, a reinforcement cage and a pile body, wherein the pile casing can be embedded in a pile hole. An open accommodating space is defined in the protective cylinder, and after the protective cylinder is installed, the middle lower part of the reinforcement cage can be installed in the accommodating space.
The steel reinforcement cage includes a plurality of muscle and a plurality of stirrup of indulging, and every is indulged the muscle and is followed first direction extension, and first direction can be for the length direction who indulges the muscle, for example indulges the muscle and extend along vertical direction, and first direction is vertical direction this moment. The plurality of longitudinal ribs form a hollow cylindrical structural member having a channel defined therein. For example, the plurality of longitudinal ribs may be spaced apart from each other in the circumferential direction of a circle, the plurality of longitudinal ribs may surround the hollow cylindrical member, and two adjacent longitudinal ribs may be spaced apart from each other in the circumferential direction. Each stirrup ring is arranged on the outer periphery of the cylindrical structural member or arranged on the inner periphery of the cylindrical structural member. When the stirrup ring is arranged on the periphery of the cylindrical structural member, the inner side surface of the stirrup can be welded with the periphery of the cylindrical structural member. When the stirrup ring is arranged on the inner periphery of the cylindrical structural member, the outer side surface of the stirrup can be welded with the inner periphery of the cylindrical structural member. A plurality of stirrups are along first direction spaced apart distribution, for example, indulge the muscle and extend along vertical direction, and columnar structure spare is located along vertical direction to a plurality of stirrups, and two adjacent stirrups are along the upper and lower direction spaced apart distribution. Each stirrup extends in a second direction, which may be at an angle to the first direction, e.g., the second direction extends in a horizontal direction and the first direction extends in a vertical direction, where the angle between the first direction and the second direction is 90 °.
The pile body in the channel is a cylindrical member extending along a first direction, the pile body comprises a concrete layer extending along the first direction, and the concrete layer comprises a base material, a hydrate and a stone skeleton, wherein the hydrate and the stone skeleton are generated by the reaction of an inorganic hydraulic cementing material and the base material and/or water in a water environment. That is, the inorganic hydraulic binder in the binder may react with at least one of the moisture in the binder and the moisture in the aqueous environment of the external groundwater. The mineral-based cementing material is added into the slurry mixed by the waste slurry or the residue soil, and the cast pile body material with strong fluidity (slump larger than 220mm), self-compaction and underwater upper strength is formed after strong stirring, and is completely universal with the existing concrete pile type construction equipment. When the material is used for curing slurry, the minerals on the surface of the material particles and the moisture in the soil undergo strong hydrolysis and hydration reaction, calcium hydroxide is decomposed from the solution and other hydrates are formed, and after various hydrates of the material are generated, some of the hydrates are continuously hardened to form a stone skeleton, and some of the hydrates interact with the soil.
Therefore, according to the superfluid solidified soil cast-in-place pile disclosed by the embodiment of the application, the pile body is combined with the pile body through the pile casing, the reinforcement cage to obtain the superfluid solidified soil cast-in-place pile, the 28-day pile body strength of the superfluid solidified soil cast-in-place pile is 0.5-10 MPa, the mixing proportion can be adjusted according to the slurry property and the design requirement, and the components and the content are adjusted to ensure the strength and the fluidity of the superfluid solidified soil cast-in-place pile. The inorganic hydraulic cementing material adopted by the application can not only react with water in the base material, but also react with underground water.
According to an embodiment of the application, protect an internal surface and an outer surface of section of thick bamboo and be equipped with first hydrophobic layer, indulge the outside coating of muscle and have the second hydrophobic layer, be equipped with the slide that extends along the first direction on the one side of indulging the muscle and keeping away from the stirrup, be equipped with on the slide along mobilizable mud jacking spare of first direction.
In other words, the inner surface and the outer surface of the protective cylinder are both provided with the first hydrophobic layers, and the first hydrophobic layers are arranged to prevent underground water from entering the accommodating space to a certain extent. The outside coating of indulging the muscle has the second hydrophobic layer, is equipped with the slide that extends along first direction in the one side of indulging the muscle and keeping away from the stirrup.
The longitudinal reinforcement is provided with a slide way extending along the first direction on one side far away from the stirrup, in the process of producing the cast-in-place pile, a grouting piece can be adopted to be matched with the slide way, the grouting piece can move along the extending direction of the slide way, the grout can be pressed down through the grouting piece, and the grouting piece is movable, so that the upper end face of the cast-in-place pile can be pressed down through the grouting piece no matter how high the cast-in-place pile is, the position can be adjusted along with the increase of the height of the cast-in-place pile, for example, after a short-term stage of pouring, the grouting piece is adjusted to the upper end face of the cast-in-place pile in the period. Wherein, the slide can play the effect of direction.
In some embodiments of the present application, the pile body includes a first concrete layer 11 and a second concrete layer 12, the first concrete layer 11 and the second concrete layer 12 are sequentially distributed on the pile body from the central axis of the pile body along the radial direction, the first concrete layer 11 and the second concrete layer 11 respectively include a base material, the second concrete layer 12 at least includes ceramsite, the density of the ceramsite in the second concrete layer 12 is greater than that of the ceramsite in the first concrete layer 11, and the density of the hydrate and the stone skeleton in the first concrete layer 11 is greater than that of the hydrate and the stone skeleton in the second concrete layer 12.
That is, the cross section of the pile body is a circular-like member, and in a direction from the center position of the cross section toward the outer edge of the cross section, the formed concrete can be divided into a first concrete layer 11 and a second concrete layer 12, that is, the first concrete layer 11 is closer to the center position of the pile body than the second concrete layer 12. The first concrete layer 11 and the second concrete layer 12 may comprise a binder, respectively, and the first concrete layer 11 further comprises a hydrate and a stone skeleton formed by the reaction of the inorganic hydraulic binder and the moisture in the binder, that is, the inorganic hydraulic binder in the first concrete layer 11 can react with the moisture in the binder to form a hydrate and a stone skeleton, for example, a hydration reaction. When the raw material of the second concrete layer 12 also includes an inorganic hydraulic binder, hydrate and stone skeleton can be generated by reaction, which will not be described in detail. The pile body can be provided with the first concrete layer 11 and the second concrete layer 12 through a double-screw structure during production.
The second concrete layer 12 at least comprises ceramsite, the density of the ceramsite in the second concrete layer 12 is greater than that of the ceramsite in the first concrete layer 11, and the strength and compactness of the concrete can be improved by adopting the ceramsite.
By limiting the density of the ceramsite in the second concrete layer 12 to be higher than that of the ceramsite in the first concrete layer 11, and the density of the hydrate and the stone skeleton in the first concrete layer 11 to be higher than that of the hydrate and the stone skeleton in the second concrete layer 12, the middle position of the cast-in-place pile can be controlled not to be easily affected by underground water, and the forming of the cast-in-place pile can not be affected even if more underground water exists.
It can be seen that by defining the content and distribution relationship of the respective components in the first concrete layer 11 and the second concrete layer 12, it is possible to control most of the inorganic hydraulic binder to react with water in the binder and a small part to react with groundwater. Even if the content of the underground water is high, on one hand, the intensity of the cast-in-place pile is not influenced by the existence of the underground water through the ceramsite and the hydrophobic structure and on the other hand through the adoption of the inorganic hydraulic cementing material. The superfluid solidified soil cast-in-place pile not only can not produce waste residue and waste liquid, but also can utilize waste slurry or waste soil, has consideration to environmental protection, new materials and new processes, is a new choice of a foundation form of a building in an area with abundant underground water, and can be used for foundation reinforcement, composite pile foundations, engineering piles and the like.
According to an embodiment of the application, the cross section of the pile body is circular, and the density of the hydrate and the stone skeleton in the range of the circular concentric circles is the same, for example, a plurality of circles are drawn with the center of the cross section of the pile body as a starting point, the plurality of circles are concentric circles, for convenience of description, two concentric circles are taken as an example, the diameter of the first concentric circle is smaller than that of the cross section, the first concentric circle comprises the center of the cross section, the second concentric circle is located on the periphery of the first concentric circle, the range of the first concentric circle is defined as an inner region, a hollow annular range defined between the second concentric circle and the first concentric circle is defined as an outer region, the density of the hydrate and the stone skeleton in the plurality of positions of the inner region is the same, and the density of the hydrate and the stone skeleton in the plurality of positions of the outer region is the same. In the embodiment, by limiting the density of hydrate and the density of the stone skeleton to be the same at a plurality of positions, not only can the processing and the manufacturing be facilitated, but also the components of the positions with the same size from the circle center on the cross section of the cast-in-place pile can be ensured to be approximately the same. The embodiment can be applied to the scene that the distribution of groundwater in the surrounding environment of the cast-in-place pile is more uniform.
In some embodiments of the present application, the outer circumferential surface of the pile body is circumferentially divided into a first side surface and a second side surface, the cross section of the pile body is divided into a first area 13 and a second area 14, the first area 13 corresponds to the first side surface, the second area 14 corresponds to the second side surface, when the water content of the environment corresponding to the first side surface is greater than the water content of the environment corresponding to the second side surface, or when the water impact force of the environment corresponding to the first side surface is greater than the water impact force of the environment corresponding to the second side surface, the density of the ceramsite in the first area 13 is greater than the density of the ceramsite in the second area 14, and the density of the hydrate and the stone skeleton in the first area 13 is less than the density of the hydrate and the stone skeleton in the second area 14.
The embodiment can correspond to the condition that the distribution of the groundwater of the environment is uneven, and the amount of the groundwater corresponding to the first side surface is larger than that of the groundwater corresponding to the second side surface. Or the impact force of the groundwater against the first side is greater than the impact force of the groundwater against the second side, for example, when the amount of groundwater has accumulated to a first degree, combined with the topography, a current is formed having a flow direction, the first side being upstream and the second side being downstream relative to the second side.
By setting the density of the ceramsite in the first region 13 corresponding to the first side surface on the pile body to be higher than the density of the ceramsite in the second region 14 corresponding to the second side surface on the pile body, the density of the hydrate and the stone skeleton in the first region 13 is lower than the density of the hydrate and the stone skeleton in the second region 14, and it is possible to prevent the inorganic hydraulic binder from being affected by the impact force of the groundwater and being difficult to react with most of the water in the base material.
According to one embodiment of the application, the aperture of the ceramsite close to the self central axis of the pile body is larger than that of the ceramsite close to the outer peripheral surface of the pile body. That is to say, the ceramsite is a porous body, the apertures of the ceramsite at a plurality of positions on the pile body can be different, the aperture of the ceramsite close to the center of the pile body is larger, the binding force between the ceramsite and the base material, the stone framework and the like can be increased, the probability of other powder bodies entering the pores on the ceramsite can be increased by increasing the specific surface area of the aperture of the ceramsite, and the binding force is increased. The aperture of the ceramsite close to the peripheral surface of the pile body is smaller, so that the groundwater penetrating through the pile casing is prevented from entering the inside of the ceramsite through the hole.
According to one embodiment of the application, the aperture of the ceramsite close to the self central axis of the pile body is smaller than that of the ceramsite close to the outer peripheral surface of the pile body, and the microporous structure of the ceramsite close to the outer peripheral surface of the pile body is internally provided with the hydrophobic group. In the embodiment, coarser ceramsite can be adopted, so that the production cost is reduced.
According to one embodiment of the application, the pile body further comprises a first matrix and a second matrix, the density of the first matrix is smaller than that of the base material, the density of the second matrix is larger than that of the base material, and the second matrix has adhesion with the stone skeleton. The first matrix and the second matrix can be powder, the density of the first matrix is less than that of the base material, the density of the second matrix is greater than that of the base material, when a section of cast-in-place pile is formed, because the density of the first matrix is less than that of the base material, the first matrix can move upwards gradually, part of the first matrix can float up to the upper surface of the section of pile body, the roughness of the upper surface of the section of pile body is increased, and therefore when the next section of pile body is formed by continuous upward casting, the binding force between the upper section of pile body and the lower section of pile body is improved. Because the density of the second matrix is greater than that of the base material, when a cut pile is formed, on one hand, the second matrix of the cut pile body gradually moves downwards to increase the roughness of the lower surface of the cut pile body, so that the bonding force between the second matrix and the pile body below the cut pile body is enhanced; in another aspect, the second substrate has adhesion with the stone skeleton, such as bonding force, van der waals force, etc., and the downward movement of the second substrate can drive a part of the stone skeleton to move downward, so that the center of gravity is lowered, and the structural stability is increased.
In some embodiments herein, the inorganic hydraulic cementitious material is tricalcium silicate, dicalcium silicate, tricalcium aluminate, or tetracalcium aluminoferrite. For example, the reaction process of some components is as follows:
from tricalcium silicate (3 CaO. SiO)2) The hydration reaction can generate hydrated calcium silicate and calcium hydroxide, which are the determining factors for improving the strength of the solidified soil:
2(3CaO·SiO2)+6H2O——3CaO·2SiO2·3H2O+3Ca(OH)2
dicalcium silicate (2 CaO. SiO)2) Hydration reaction can generate hydrated calcium silicate and calcium hydroxide, and the later strength of the solidified soil is mainly formed:
2(2CaO·SiO2)+4H2O——3CaO·2SiO2·3H2O+3Ca(OH)2
tricalcium aluminate (3 CaO. Al)2O3) The hydration reaction generates hydrated calcium aluminate, the hydration speed is fastest, and the early coagulation can be promoted:
3CaO·Al2O3+6H2O——3CaO·Al2O3·6H2O
tetracalcium aluminoferrite (4 CaO. Al)2O3·Fe2O3) Hydration reaction to produce hydrated calcium aluminate andhydrated calcium ferrite can promote the early strength of the reinforced soil:
4CaO·Al2O3·Fe2O3+2Ca(OH)2+10H2O——3CaO·Al2O3·6H2O+2CaO·Fe2O3·6H2O。
the application also provides a production method of the superfluid solidified soil cast-in-place pile, which can be used for producing the cast-in-place pile of any embodiment. The method comprises the following steps: s1, embedding a pile casing at the pile hole position; s2, hanging the reinforcement cage in the accommodating space of the pile casing; and S3, pouring slurry into the channel in the reinforcement cage to form a pile body, wherein the pile body is the pile body in any embodiment. In step S3, the binder and the inorganic hydraulic binder are mixed, and the inorganic hydraulic binder is capable of reacting with moisture to form a hydrate and a stone skeleton. The moisture here may be the moisture in the base or groundwater.
According to an embodiment of the application, the production method further comprises the steps of: the mud jacking piece movably arranged on the slide way along the first direction applies pressure downwards in the mud grouting process, the mud jacking piece is located above the pile body, and one side, away from the central axis of the pile body, of the mud jacking piece is coated with a third hydrophobic layer. The grouting piece is matched with the slideway, so that grouting can be pressed downwards.
According to an embodiment of the application, the mud jacking piece includes slider, connecting piece and holding down plate, and slider and slide movably are connected, and the lower extreme and the slider of connecting piece are connected, and the lateral surface coating of connecting piece has the third hydrophobic layer, and the holding down plate extends along the second direction, and the holding down plate is connected with the upper end of connecting piece. It should be noted that the lower press plate can be switched between the pressing position and the avoiding position by adopting a mode of being movable relative to the connecting piece, or the pressing and avoiding of the slurry can be realized by limiting the position relation between the pressing piece and the slurry inlet pipe. Through the coating at the lateral surface of connecting piece have the third hydrophobic layer, keep away from the one side of pile body at the connecting piece promptly and be provided with the third hydrophobic layer, can play the hydrophobic effect of certain degree to crossing the groundwater that protects a section of thick bamboo inflow and the moisture in the environment.
According to an embodiment of the present application, the inorganic hydraulic binder includes a first inorganic hydraulic binder and a second inorganic hydraulic binder, wherein the periphery of the first inorganic hydraulic binder is not coated with a slow release layer, the periphery of the second inorganic hydraulic binder is coated with a slow release layer, the slow release layer can react with water, the slow release layer can be an existing slow release material capable of reacting with water, and the description thereof is omitted. That is, a sufficient amount of the second inorganic hydraulic binder is mixed in the base material, both the first inorganic hydraulic binder and the second inorganic hydraulic binder can react with moisture, and the outer surface of the second inorganic hydraulic binder is coated with a slow release layer as compared with the first inorganic hydraulic binder. In casting, first, both the first and the second inorganic hydraulic binders in the binder are able to react with the moisture in the binder during the mixing of the binder with the inorganic hydraulic binder. When the mixture enters the ground and the ground water exists underground, since the outer surface of the second inorganic hydraulic binder has a slow-release layer, the slow-release layer needs to be removed first to allow the mixture to enter the internal reaction, and the first inorganic hydraulic binder and the second inorganic hydraulic binder are different in reaction rate and time difference. Thus, during the reaction with groundwater, a part of the inorganic hydraulic binder remains to react with the binder, resulting in a low amount of inorganic hydraulic binder that does not react with the binder. When no groundwater is present, or after groundwater consumption and water in the base material are consumed, a part of the second inorganic hydraulic binder remains in the base material, so that even if water erosion occurs after casting, self-repairing can be realized by the reaction of the second inorganic hydraulic binder with water.
In conclusion, according to the superfluid solidified soil cast-in-place pile and the production method thereof, the obtained superfluid solidified soil cast-in-place pile is high in construction speed, controllable in quality, low in cost and capable of guaranteeing pile body strength underwater, and is a novel pile foundation which not only treats waste slurry or muck, but also solves the construction problem.
The super flow state solidified soil bored concrete pile of this application has following advantage at least:
(1) the superfluid solidified soil cast-in-place pile firstly utilizes waste slurry or muck as a resource, and the waste slurry or muck is used as a base material to be processed into a pile body material, so that the problem that part of the slurry and muck fall to the ground can be solved, and the environmental protection significance is great.
(2) The cast-in-place pile has the advantages of mature process, simple equipment, simple and convenient operation and easy quality control.
(3) The pile body material of the superfluid solidified soil cast-in-place pile is formed by mechanically stirring mud and additives, the uniformity of the pile body material in a specific area is completely consistent, and the strength of the pile body on water and under water can be kept consistent due to the hydrophilicity of the mineral-based cementing material.
(4) The adjustable range of the pile body strength of the super-fluidized solidified soil cast-in-place pile is large, the pile body strength range of the 28-day pile body is 0.5-10 MPa, and the super-fluidized solidified soil cast-in-place pile can be suitable for foundation reinforcement, composite foundations and M piles of stiff composite piles and can also be used as engineering piles.
(5) The mineral-based cementing material used for the superfluid solidified soil cast-in-place pile and the solidified material mixed with the slurry have the characteristics of early strength, quick solidification, micro-expansion, self-compaction, hydrophilicity and the like. The micro-expansion characteristic can ensure that the pile body is tightly combined with the surrounding original soil body, the lateral confining pressure of the pile body is increased, and the vertical bearing capacity of the pile body is enhanced.
(6) The superfluid solidified soil cast-in-place pile has the characteristics of economy and environmental protection, the strength is far greater than that of a cement pile, the strength is equivalent to that of low-grade concrete when the strength is high, and the manufacturing cost is far lower than that of a concrete cast-in-place pile and that of a cement pile. During construction, centralized stirring and cast-in-place can be adopted, the material is in a flow plastic state, dust pollution cannot be generated, and the method is green and environment-friendly.
Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.
Claims (10)
1. The super fluid state solidified soil cast-in-place pile is characterized by comprising:
the protective cylinder is internally limited with an accommodating space;
the middle lower part of the reinforcement cage is located in the accommodating space, the reinforcement cage comprises a plurality of longitudinal ribs and a plurality of stirrups, each longitudinal rib extends along a first direction, the plurality of longitudinal ribs form a cylindrical structural member with a channel, each stirrup is annularly arranged on the periphery or the inner periphery of the cylindrical structural member, the plurality of stirrups are distributed at intervals along the first direction, and each stirrup extends along a second direction;
the pile body is a cylindrical piece and comprises a base material, and a hydrate and a stone skeleton which are generated by the reaction of an inorganic hydraulic cementing material and the base material and/or water in a water environment.
2. The superfluid solid cast-in-place pile according to claim 1, wherein the inner surface and the outer surface of the casing are provided with first hydrophobic layers, the outer sides of the longitudinal ribs are coated with second hydrophobic layers, a slideway extending in the first direction is arranged on one side of the longitudinal ribs away from the stirrups, and a grouting member movable in the first direction is arranged on the slideway.
3. The superfluid state solidified concrete cast-in-place pile according to claim 1, wherein the pile body comprises a first concrete layer and a second concrete layer, the first concrete layer and the second concrete layer are sequentially distributed on the pile body from the central axis of the pile body along the radial direction outwards, the first concrete layer and the second concrete layer respectively comprise a base material, the second concrete layer at least comprises ceramsite, the density of the ceramsite in the second concrete layer is higher than that of the ceramsite in the first concrete layer, and the density of hydrate and stone skeleton in the first concrete layer is higher than that of hydrate and stone skeleton in the second concrete layer.
4. The superfluid solid soil cast-in-place pile according to claim 3, wherein the cross-section of the pile body is circular, and the density of the hydrate and the stone skeleton is the same within the range in which the circular shape is a concentric circle.
5. The superfluid solid soil cast-in-place pile according to claim 3, wherein the outer circumferential surface of the pile body is circumferentially divided into a first side surface and a second side surface, the cross section of the pile body is divided into a first region and a second region, the first region corresponds to the first side surface, the second region corresponds to the second side surface, when the water content of the environment corresponding to the first side surface is greater than the water content of the environment corresponding to the second side surface, or when the water impact force of the environment corresponding to the first side surface is greater than the water impact force of the environment corresponding to the second side surface, the density of the ceramsite in the first region is greater than the density of the ceramsite in the second region, and the density of the hydrate and the stone skeleton in the first region is less than the density of the hydrate and the stone skeleton in the second region.
6. The superfluid solid soil cast-in-place pile according to claim 3, wherein the apertures of the ceramsite near the center axis of the pile body are larger than the apertures of the ceramsite near the outer circumferential surface of the pile body.
7. The superfluid solid soil cast-in-place pile according to claim 3, wherein the pore size of the ceramsite near the central axis of the pile body is smaller than the pore size of the ceramsite near the outer circumferential surface of the pile body, and the microporous structure of the ceramsite near the outer circumferential surface of the pile body has hydrophobic groups.
8. The superfluid solid soil cast-in-place pile according to claim 1, wherein said pile body further comprises:
a first matrix having a density less than a density of the base stock;
a second matrix having a density greater than a density of the base material, the second matrix having an adhesion with the stone skeleton.
9. A production method of a superfluid solidified soil cast-in-place pile is characterized by comprising the following steps:
s1, embedding a pile casing at the pile hole position;
s2, hanging the reinforcement cage in the accommodating space of the pile casing;
s3, grouting mud into the channel in the reinforcement cage to form a pile body, wherein the pile body is the pile body according to any one of claims 1-8;
wherein, in step S3, the binder and the inorganic hydraulic binder are mixed, the inorganic hydraulic binder being capable of reacting with moisture to form a hydrate and a stone skeleton.
10. The production process according to claim 9, characterized in that the inorganic hydraulic binders comprise a first inorganic hydraulic binder and a second inorganic hydraulic binder, wherein the periphery of the first inorganic hydraulic binder is not coated with a slow release layer and the periphery of the second inorganic hydraulic binder is coated with a slow release layer, which is capable of reacting with water.
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