CN108411889B - Structured cemented gravel pile and construction method thereof - Google Patents
Structured cemented gravel pile and construction method thereof Download PDFInfo
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- CN108411889B CN108411889B CN201810185860.5A CN201810185860A CN108411889B CN 108411889 B CN108411889 B CN 108411889B CN 201810185860 A CN201810185860 A CN 201810185860A CN 108411889 B CN108411889 B CN 108411889B
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- 238000010276 construction Methods 0.000 title claims abstract description 35
- 239000004575 stone Substances 0.000 claims abstract description 79
- 239000004568 cement Substances 0.000 claims abstract description 70
- 239000000463 material Substances 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000013461 design Methods 0.000 claims abstract description 10
- 238000011065 in-situ storage Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims description 16
- 238000005056 compaction Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 11
- 230000005484 gravity Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 9
- 239000011083 cement mortar Substances 0.000 description 10
- 239000002131 composite material Substances 0.000 description 7
- 239000002689 soil Substances 0.000 description 7
- 238000007596 consolidation process Methods 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 239000004567 concrete Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
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Abstract
The invention discloses a structured cemented gravel pile and a construction method thereof, wherein the structured cemented gravel pile comprises a cemented gravel pile body and a gravel pile body, and the construction method of the structured cemented gravel pile comprises the following steps: s1: carrying out in-situ test according to design requirements, and determining the porosity ratio of dense and stacked crushed stone and the expansion degree and viscosity of the self-compacting cement-based material for forming the cemented crushed stone; s2: constructing on the ground to form pile holes; s3: backfilling crushed stones into the pile holes to form crushed stone pile bodies, and vibrating by adopting a vibrator until the porosity ratio of the crushed stones reaches a preset value; s4: self-compacting cement-based materials are poured into the pile holes to bond part of the crushed stone of the pile body to form a cemented crushed stone pile body. According to the structural cemented gravel pile, the water permeability of the gravel pile is maintained, the strength and the rigidity of the structural cemented gravel pile are increased, and the horizontal load resistance of the structural cemented gravel pile is improved.
Description
Technical Field
The invention relates to the field of foundation engineering reinforcement, in particular to a structured cemented gravel pile and a construction method thereof.
Background
The gravel pile is a traditional foundation treatment method, firstly, a pile hole is constructed by adopting a vibration pipe sinking, hammering pipe sinking or impact hollowing method, then, gravel materials are backfilled in the pile hole and are vibrated to be compact, and finally, a gravel pile body is formed. The gravel piles are usually arranged in a pile group mode, and the gravel piles and soil bodies among the piles interact to form a composite bearing system, so that the bearing capacity of the foundation is improved, and the compressive deformation of the foundation is reduced. The hole structure that the compact detritus material of vibroflotation still communicates has good water permeability, and when the stake is consolidated all around, the gravel pile plays drainage channel's effect, can accelerate the consolidation of foundation soil body. But the bearing capacity and settlement of the gravel pile depend on the constraint force of soil bodies among the piles to the gravel pile to a great extent, and the weak soil bodies have poor constraint capacity to the gravel pile, so that the vertical bearing capacity of the pile is restricted; meanwhile, the pile body of the gravel pile is made of loose materials, cohesion force hardly exists among the material particles, and horizontal load can cause the gravel pile body to be cut short and fail.
Reclamation of land from sea is an important means for increasing land supply in coastal areas, and the construction of sea reclamation projects is restricted by a stable foundation structure. Sea mud is extremely soft and weak powdery clay, the self bearing capacity of the sea mud cannot meet the engineering requirement, and the sea mud is usually reinforced by adopting technologies such as gravel piles and the like. Engineering practices show that the consolidation load can cause large-amplitude lateral displacement of the gravel pile foundation, and hidden danger is brought to the stability of engineering. Based on the situation, the structural cemented gravel pile is urgently needed, the strength and the rigidity of the gravel pile can be improved through cementing the gravel layer, and high water permeability and large deformation adaptability can be kept. The existing technology for improving the strength of the gravel pile mainly comprises the steps of adopting water-permeable concrete to make the pile or embedding a grouting pipe to inject cement slurry into the hole of the gravel pile to form a complete semi-rigid pile body. The semi-rigid pile body can not meet the requirement of foundation deformation, and the grouting gravel pile is used for grouting and reinforcing gravel after soil consolidation is completed, so that the construction progress is slow, and injected cement slurry can pollute seawater.
Prior to the present invention, the invention patent: a method for constructing an underwater undispersed cement-based self-compacting material (patent No. ZL 201310465710.7; patent owner: Qinghua university, etc.) "discloses a method for constructing an underwater undispersed cement-based self-compacting material. The invention patent: cemented rock-fill dams (patentee: Qinghua university, et al; application number: 201710671580.0) "disclose a cemented rock-fill material made by pouring rock-fill material from a self-compacting cement-based material. According to the research of the Qinghua university, the research of years indicates that different particle cementation forms can be realized by controlling the fluidity, the viscosity and the pouring amount of the self-compacting cement-based material, when the pore saturation (the ratio of the slurry volume after pouring in pores of the densely-piled particle material to the pore volume of the original particle material) is less than 25-35%, the cementation particle material in the contact cementation form can be formed, and the formed cementation particle material can obviously improve the compression strength, the shear strength, the elastic modulus and the deformation modulus of the material through the hydration of cement paste, and simultaneously keep the connectivity of the original pore structure and determine the water permeability. For the underwater engineering, the university of Qinghua shows through experimental research that the underwater undispersed cement-based self-compacting material is adopted to pour the granular material, and the slurry flows downwards along the granular pores under the action of gravity, so that a contact cementing form can be formed at the contact points (surfaces) of the granules.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a construction method of the structured cemented gravel pile, which can improve the structural strength of a foundation soil body and reduce the pollution of a cementing material to the environment.
The invention also aims at the structured cemented gravel pile constructed by adopting the construction method of the structured cemented gravel pile.
According to the construction method of the structured cemented gravel pile provided by the embodiment of the invention, the structured cemented gravel pile is formed in the pile hole, the structured cemented gravel pile comprises a cemented gravel pile body and a gravel pile body in the depth direction of the pile hole, and the construction method of the structured cemented gravel pile comprises the following steps:
s1: carrying out in-situ test according to design requirements, and determining the pore ratio of compact stacking of the crushed stone and the expansion degree and viscosity of the self-compacting cement-based material for forming the cemented crushed stone;
s2: constructing and forming the pile hole on the ground;
s3: backfilling crushed stones into the pile holes to form crushed stone pile bodies, and vibrating by adopting a vibrator until the porosity ratio of the crushed stones reaches a preset value;
s4: and pouring the self-compacting cement-based material into the pile hole, wherein the self-compacting cement-based material flows along the pores of the crushed stone under the action of gravity, so that part of the crushed stone pile body is bonded to form the cemented crushed stone pile body.
According to the construction method of the structured cemented gravel pile, the cemented gravel pile body is obtained by pouring the gravel pile body with the self-compacting cement-based material, so that the strength and rigidity of the structured cemented gravel pile are improved due to the composite structure of the cemented gravel pile body and the gravel pile body, the horizontal load resistance of the structured cemented gravel pile is improved, and the high water permeability of the gravel can be kept. In addition, because the self-compaction cement-based material flows along the holes of the crushed stones under the action of gravity to bond the adjacent crushed stones to form the cemented crushed stone pile body, the pollution to the environment is less.
In some embodiments, the structural cemented gravel pile comprises at least one section of the cemented gravel pile body formed by one or more pours of the self-compacting cement-based material in the depth direction of the pile hole.
In some embodiments, the self-compacting cement-based material may be one of self-compacting cement mortar, self-compacting cement paste, self-protecting underwater self-compacting cement mortar, and self-protecting underwater self-compacting cement paste.
Specifically, when underground water is infiltrated into the pile hole, the self-compacting cement-based material adopts the underwater self-protection self-compacting mortar or the underwater self-protection self-compacting clean mortar.
Specifically, the expansion degree of the self-compacting cement mortar and the underwater self-protection type self-compacting cement clean slurry is 220-300 mm, the time of a V-shaped funnel is 1.5-2.5 s, the expansion degree of the self-compacting cement mortar and the underwater self-protection type cement mortar is 250-330 mm, and the time of the V-shaped funnel is 6-12 s.
According to the structured cemented gravel pile of the embodiment of the invention, the structured cemented gravel pile is formed in the pile hole, and is characterized by comprising: a crushed stone pile body; the pile body of the cemented crushed stone is formed by bonding parts of the self-compacting cement-based material and the pile body of the crushed stone.
According to the structured cemented gravel pile provided by the embodiment of the invention, the cemented gravel pile body is obtained by pouring the gravel pile body by adopting the self-compacting cement-based material, so that the composite structure of the cemented gravel pile body and the gravel pile body increases the strength and rigidity of the structured cemented gravel pile, improves the horizontal load resistance of the structured cemented gravel pile, and can also maintain the high water permeability of the gravel. In addition, because the self-compaction cement-based material flows along the holes of the crushed stone to bond adjacent crushed stones under the action of gravity, the original hole structure of the crushed stone is kept, and the pollution to the environment is less.
In some embodiments, the structured cemented gravel pile comprises one or more sections of the cemented gravel pile shaft in the depth direction.
In some embodiments, the structured cemented gravel pile may construct a construction foundation.
In some embodiments, the construction foundation is disposed on a land surface or on sea mud.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a construction schematic diagram of a structural cemented gravel pile according to an embodiment of the present invention.
Fig. 2 is a structural schematic diagram of a structural cemented gravel pile according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a structural cemented gravel pile according to another embodiment of the present invention.
Fig. 4 is a schematic reference numeral of a top view structure of a structured cemented stone-breaking pile group structure according to another embodiment of the present invention:
the pile comprises a structural cemented gravel pile 100, a cemented gravel pile body 1, a gravel pile body 2, a self-compacting cement-based material 3, gravel 4, a pile hole 5 and a vibro-replacement device 200.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A method of constructing a structured cemented gravel pile according to an embodiment of the present invention is described below with reference to fig. 1 to 4.
According to the construction method of the structured cemented gravel pile of the embodiment of the invention, as shown in fig. 2-3, the structured cemented gravel pile 100 is formed in the pile hole 5, and the structured cemented gravel pile 100 comprises a cemented gravel pile body 1 and a gravel pile body 2 in the depth direction of the pile hole 5, and the construction method of the structured cemented gravel pile comprises the following steps:
s1: carrying out in-situ test according to design requirements, and determining the porosity ratio of dense and stacked crushed stone and the expansion degree and viscosity of the self-compacting cement-based material for forming the cemented crushed stone;
s2: constructing on the ground to form pile holes;
s3: backfilling crushed stones into the pile holes to form crushed stone pile bodies, and vibrating by adopting a vibrator until the porosity ratio of the crushed stones reaches a preset value;
s4: and pouring a self-compacting cement-based material into the pile hole, wherein the self-compacting cement-based material flows along the pores of the crushed stone under the action of gravity so as to bond the crushed stone of part of the crushed stone pile body to form the cemented crushed stone pile body.
It can be understood that, with the structural cemented gravel pile 100 constructed by the construction method of the embodiment, the cemented gravel pile body 1 is obtained by pouring the gravel pile body 2 with the self-compacting cement-based material 3, so that the composite structure of the cemented gravel pile body 1 and the gravel pile body 2 increases the strength and rigidity of the structural cemented gravel pile 100, and improves the horizontal load resistance of the structural cemented gravel pile 100. Meanwhile, the self-compacting cement-based material 3 does not need to be vibrated in the pouring process, so that the synchronous construction of the pouring process and the vibrating and impacting process of the crushed stone material 4 is realized, and the project progress is improved.
According to the construction method of the structured cemented gravel pile, the cemented gravel pile body 1 is obtained by pouring the gravel pile body 2 with the self-compacting cement-based material 3, so that the composite structure of the cemented gravel pile body 1 and the gravel pile body 2 increases the strength and rigidity of the structured cemented gravel pile 100, improves the horizontal load resistance of the structured cemented gravel pile 100, and can also maintain the high water permeability of the gravel 4. In addition, because the self-compaction cement-based material 3 flows along the holes of the crushed stones under the action of gravity to bond the adjacent crushed stones to form the cemented crushed stone pile body 1, the pollution to the environment is less.
In some embodiments, as shown in fig. 3, after the bottom cemented gravel pile shaft 1 is formed, the process from step S3 to step S4 is repeated, so that the structured cemented gravel pile 100 includes multiple sections of cemented gravel pile shafts 1 along the depth direction. It can be understood that the spatial distribution of the cemented gravel pile shaft 1 can be adjusted according to actual construction conditions, so that the structured cemented gravel pile 100 has the best performance.
In some embodiments, the self-compacting cement-based material 3 may be one of self-compacting cement mortar, self-compacting cement paste, self-protecting underwater self-compacting cement mortar, and self-protecting underwater self-compacting cement paste. Advantageously, when the pile hole 5 is infiltrated with groundwater, the self-compacting cement-based material 3 is an underwater self-protecting self-compacting mortar or an underwater self-protecting self-compacting clean mortar. It can be understood that, in actual construction, the type of self-compaction cement-based material 3 is selected according to the actual state of pile hole 5, so that the type of self-compaction cement-based material 3 can better adapt to the actual working condition, and the self-compaction cement-based material 3 can better flow along the pores of crushed stone pile body 2 to form cemented crushed stone pile body 1.
Specifically, the expansion degree of the self-compacting cement mortar and the underwater self-protecting type self-compacting cement clean slurry is 220-300 mm, the time of a V-shaped funnel is 1.5-2.5 s, the expansion degree of the self-compacting cement mortar and the underwater self-protecting type cement mortar is 250-330 mm, and the time of the V-shaped funnel is 6-12 s. It can be understood that the controllability of the length of the cemented gravel pile body 1 is realized by adjusting the expansion degree, the viscosity and the pouring amount of the self-compacting cement 3, and the strength, the rigidity and the geological condition adaptability of the structured cemented gravel pile 100 are greatly improved.
Reference is now made to a method of constructing a structured cemented gravel pile, which describes three specific embodiments of the present invention.
Example 1:
as shown in fig. 2, the construction result of this embodiment is a structural cemented gravel pile 100 with a single-section cemented gravel pile body 1, the diameter of the pile body is 500mm, the cemented gravel pile body 1 is located at the top of the pile, the length of the cemented gravel pile body 1 is 2m, the particle size of the gravel 4 is 30-80mm, the self-compacting cement-based material 3 is self-compacting cement paste, the expansion degree of the self-compacting cement paste is 260mm, and the V-shaped funnel time is 2.57 s.
The concrete construction steps are as follows:
s1: performing in-situ test according to design requirements, and determining that the pore ratio of the compacted and piled crushed stone 4 is 0.3, the expansion degree of the self-compacting cement-based material 3 for forming the cemented crushed stone pile body 1 is 260mm, and the passing time of the V-shaped funnel is 2.57 s;
s2: constructing to form a pile hole 5;
s3: backfilling the crushed stone 4 into the pile hole 5 and vibrating by adopting a vibrator 200 until the aperture ratio of the crushed stone pile body 2 reaches 0.3 and the length of the pile body reaches the design requirement;
s4: 18 liters of self-compacting cement paste is poured on the surface of the crushed stone 4 at the pile top part, and the self-compacting cement paste flows downwards along the holes of the crushed stone under the action of gravity to bond adjacent crushed stones to form a cemented crushed stone pile body 1 with the height of about 2 m.
Example 2:
as shown in fig. 3, the construction result of this embodiment is a structured cemented gravel pile 100 of a multi-section cemented gravel pile body 1, the structured cemented gravel pile 100 is applied to a sea-filling project, the multi-section cemented gravel pile body 1 is located at the pile top and the pile body bottom, the diameter of the pile body is 500mm, the length of the pile top cemented gravel pile body 1 is 2m, the length of the pile body bottom cemented gravel pile body 1 is 2.5m, the particle size of the gravel 4 is 30-50mm, the self-compacting cement-based material 3 adopts an underwater self-protecting self-compacting cement paste, the expansion degree of the underwater self-protecting self-compacting cement paste is 280mm, and the V-shaped funnel time is 2.0 s.
The concrete construction steps are as follows:
s1: performing in-situ test according to design requirements, and determining that the pore ratio of the compacted and piled crushed stone 4 is 0.3, the expansion degree of the self-compacting cement-based material 3 for forming the cemented crushed stone pile body 1 is 280mm, and the passing time of the V-shaped funnel is 2.0 s;
s2: constructing to form a pile hole 5;
s3: backfilling the crushed stone 4 into the pile hole 5 and vibrating by adopting a vibrator 200 until the aperture ratio of the crushed stone pile body 2 reaches 0.3 and the stacking height of the crushed stone meets the grouting design requirement;
s4: 18 liters of underwater self-protection self-compaction cement paste is poured on the surface of the crushed stone in the pile hole 5, and the underwater self-protection self-compaction cement paste flows downwards along the hole of the crushed stone under the action of gravity to bond adjacent crushed stones, so that a cemented crushed stone pile body 1 with the height of about 2.5m is formed.
S5: after the underwater self-protection self-compaction cement paste is poured, the backfilling and the vibroflotation of the crushed stone 4 are synchronously carried out until the crushed stone 4 is compacted and piled up to the top of the pile hole;
s6: 16 liters of self-compacting cement paste is poured on the surface of the crushed stone 4 at the pile top, and the self-compacting cement paste flows downwards along the holes of the crushed stone under the action of gravity to bond adjacent crushed stones to form a cemented crushed stone pile body 1 with the height of about 2 m.
Implementation 3:
as shown in fig. 4, the construction result of the structural cemented gravel pile group of the embodiment includes multiple structural cemented gravel piles 100 according to the engineering structure calculation, a part of the piles are poured to form a cemented gravel pile body 1 at the top, a part of the piles are poured to form a cemented gravel pile body 1 at the middle, a part of the piles are poured to form a cemented gravel pile body 1 at the top, and a part of the piles include multiple sections of cemented gravel pile bodies 1.
The structural cemented gravel piles 100 of the embodiment are arranged in groups, and the optimal design of the structural performance is realized by the structural calculation of the position of the cemented gravel pile body 1 of each pile in the pile group, so that the stability of the whole reinforced foundation is improved.
According to the structured cemented gravel pile 100 provided by the embodiment of the invention, the structured cemented gravel pile 100 is formed in the pile hole 5, the structured cemented gravel pile 100 comprises a cemented gravel pile body 1 and a gravel pile body 2, and the cemented gravel pile body 1 is formed by self-compacting cement-based materials 3 poured into the gravel pile body 2 in the pile hole 5. It can be understood that, because the cemented gravel pile body 1 is obtained by pouring part of the gravel pile body 2 by using the self-compacting cement-based material 3, the composite structure of the cemented gravel pile body 1 and the gravel pile body 2 increases the strength and rigidity of the structured cemented gravel pile 100, and improves the horizontal load resistance of the structured cemented gravel pile 100. Meanwhile, the self-compacting cement-based material 3 does not need to be injected through a grouting pipe, so that the synchronous construction of the pouring process and the vibration and impact process of the crushed stone 4 is realized, and the project progress is improved.
According to the structured cemented gravel pile 100 provided by the embodiment of the invention, the cemented gravel pile body 1 is obtained by pouring the gravel pile body 2 by adopting the self-compacting cement-based material 3, so that the composite structure of the cemented gravel pile body 1 and the gravel pile body 2 increases the strength and rigidity of the structured cemented gravel pile 100, improves the horizontal load resistance of the structured cemented gravel pile 100, and can also maintain the high water permeability of the gravel 4. In addition, because self-compaction cement-based material 3 flows along the crushed stone pore under the action of gravity and bonds adjacent crushed stones, the original pore structure of the crushed stone is kept, and the pollution to the environment is less.
In some embodiments, the structured cemented gravel pile 100 comprises a plurality of segments of cemented gravel pile shaft 1, the plurality of segments of cemented gravel pile shaft 1 being distributed along the depth direction. It can be understood that the spatial distribution of the cemented gravel pile body 1 and the gravel pile body 2 can be adjusted according to actual construction conditions, so that the structured cemented gravel pile 100 has the best performance.
In some embodiments, the structured cemented gravel pile 100 may construct a construction foundation. Thereby, the structural stability of the construction foundation can be improved.
In some embodiments, the construction foundation is disposed on a land surface or on sea mud. It can be understood that the structured cemented gravel pile 100 is adopted to reinforce soft foundations such as sea mud and the like, on one hand, the high water permeability of the gravel pile can be maintained, the consolidation of a foundation soil body is accelerated, on the other hand, the strength of the gravel pile can be improved, and the stability of an engineering structure is maintained.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (2)
1. The utility model provides a construction method of structuralized glued gravel pile, structuralized glued gravel pile shaping is in the stake is downthehole, in the direction of depth in stake hole, structuralized glued gravel pile includes glued gravel pile body and gravel pile body, its characterized in that, structuralized glued gravel pile is used for the engineering of filling in the sea, in the direction of depth in stake hole, structuralized glued gravel pile includes multisection glued gravel pile body, glued gravel pile body is through pouring into the clean pulp of type self-protecting self-compacting cement under water many times and forming, the particle diameter of the gravel material that is used for forming glued gravel pile body is 30-50mm, the expansion degree of the clean pulp of type self-compacting cement of type self-protecting under water is 220mm-300mm, V type funnel time is 1.5s-2.5s, construction method of structuralized glued gravel pile includes following step:
s1: carrying out an on-site in-situ test according to design requirements, and determining the porosity ratio of the crushed stone compact stacking, the expansion degree of the underwater self-protection self-compacting cement clean slurry for forming the cemented crushed stone pile body and the V-shaped funnel time;
s2: constructing the pile hole on the sea mud;
s3: backfilling the crushed stone to form a crushed stone pile body, and vibrating the crushed stone by using a vibrator until the porosity ratio of the crushed stone reaches a preset value and the stacking height of the crushed stone reaches the grouting design requirement;
s4: pouring the underwater self-protection self-compaction cement paste into the pile hole, wherein the underwater self-protection self-compaction cement paste flows along the pores of the crushed stone under the action of gravity so as to bond part of the crushed stone pile body to form the cemented crushed stone pile body, and the underwater self-protection self-compaction cement paste is bonded between adjacent crushed stones so as to keep the original pore structure of the crushed stone;
and after the cemented gravel pile body at the bottom is formed, repeating the processes of the step S3 and the step S4, so that the structured cemented gravel pile comprises a plurality of sections of cemented gravel pile bodies along the depth direction.
2. A structured cemented gravel pile obtained by the construction method of claim 1, which is formed in a pile hole, wherein the structured cemented gravel pile comprises:
a crushed stone pile body;
the pile body of the cemented gravel is formed by adhering part of the pile body of the gravel to an underwater self-protection self-compaction cement paste, and the underwater self-protection self-compaction cement paste is adhered between adjacent gravels to keep the original pore structure of the gravel;
the structured cemented gravel pile comprises a plurality of sections of cemented gravel pile bodies in the depth direction, the particle size of gravel for forming the cemented gravel pile bodies is 30-50mm, the expansion degree of the underwater self-protection self-compacting cement clean slurry is 220-300 mm, and the time of a V-shaped funnel is 1.5-2.5 s; the structured cemented gravel pile is used for sea reclamation projects.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810185860.5A CN108411889B (en) | 2018-03-07 | 2018-03-07 | Structured cemented gravel pile and construction method thereof |
| PCT/CN2019/071856 WO2019169956A1 (en) | 2018-03-07 | 2019-01-16 | Structured cemented gravel pile and construction method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810185860.5A CN108411889B (en) | 2018-03-07 | 2018-03-07 | Structured cemented gravel pile and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108411889A CN108411889A (en) | 2018-08-17 |
| CN108411889B true CN108411889B (en) | 2021-02-05 |
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| CN108411889B (en) * | 2018-03-07 | 2021-02-05 | 清华大学 | Structured cemented gravel pile and construction method thereof |
| CN109485316B (en) * | 2019-01-18 | 2020-11-10 | 清华大学 | Pouring type cementing granule and preparation method thereof |
| CN110820772A (en) * | 2019-11-21 | 2020-02-21 | 中国长江三峡集团有限公司 | Bulk accumulation body side slope slide-resistant pile and structured cementing combined reinforcing method and construction process |
| CN112227344A (en) * | 2020-10-11 | 2021-01-15 | 福建新华夏建工有限公司 | Soft foundation reinforcement construction method with good reinforcement effect |
| CN112922019A (en) * | 2021-03-08 | 2021-06-08 | 中国长江三峡集团有限公司 | Single-pile foundation for reinforcing soft soil foundation by offshore wind power vibroflotation cemented pile and construction method |
| CN112922018B (en) * | 2021-03-08 | 2022-07-12 | 中国长江三峡集团有限公司 | Construction method of gravity foundation of offshore wind power cemented gravel pile reinforced soft soil foundation |
| WO2022037707A1 (en) * | 2021-03-08 | 2022-02-24 | 中国长江三峡集团有限公司 | Monopile foundation using cemented vibroflotation pile to reinforce soft soil foundation for use in offshore wind power generation, and construction method |
| CN113585224A (en) * | 2021-08-03 | 2021-11-02 | 河北地质大学 | Immersed tube reinforcement gravel pile construction method for reinforcing soft foundation |
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| DE102005001227A1 (en) * | 2005-01-10 | 2006-07-20 | Keller Grundbau Gmbh | Method for improving a foundation in the ground comprises inserting columns having a lower bound section made from mortar or cement and an upper bound section made from ballast |
| CN101781888B (en) * | 2010-02-01 | 2012-01-04 | 河海大学 | Vibration sinking tube compacted gravel-concrete combined pile and construction method thereof |
| CN102071679B (en) * | 2010-12-29 | 2012-07-04 | 西安建筑科技大学 | Method for consolidating existing building foundation |
| CN102155009A (en) * | 2011-05-23 | 2011-08-17 | 中铁二院工程集团有限责任公司 | Crushed rock pile used for strengthening extremely soft soil foundation and construction method thereof |
| CN103452093A (en) * | 2013-08-30 | 2013-12-18 | 山东大学 | Compound foundation formed by serial connection of water-permeable concrete pile and gravel pile and foundation treatment method |
| CN103556639B (en) * | 2013-10-09 | 2015-05-27 | 清华大学 | Construction method for underwater non-dispersible cement-based self-compaction material |
| CN105330217A (en) * | 2015-11-24 | 2016-02-17 | 扬州康龙环保工程有限公司 | Preparation method of novel high-strength self-compacting concrete |
| CN206818560U (en) * | 2016-12-30 | 2017-12-29 | 清华大学 | A kind of self-compaction cement paste rheology testing device |
| CN107700435B (en) * | 2017-09-30 | 2019-11-22 | 清华大学 | The cementing rock-fill dams of rock-fill concrete core-wall and its construction method |
| CN108411889B (en) * | 2018-03-07 | 2021-02-05 | 清华大学 | Structured cemented gravel pile and construction method thereof |
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