CN112854177A - Sea-facies mud layer reinforcing treatment method - Google Patents
Sea-facies mud layer reinforcing treatment method Download PDFInfo
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- CN112854177A CN112854177A CN202110047301.XA CN202110047301A CN112854177A CN 112854177 A CN112854177 A CN 112854177A CN 202110047301 A CN202110047301 A CN 202110047301A CN 112854177 A CN112854177 A CN 112854177A
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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
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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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Abstract
The invention discloses a sea phase mud layer reinforcement treatment method, which comprises the following steps: carrying out field leveling and excavation work on the surface of the marine facies mud layer to be subjected to foundation reinforcement; determining the arrangement space of the hollow PHC tubular piles according to engineering design requirements, and drilling pile holes by adopting a down-the-hole drill; adopting a static pile press to inject the hollow PHC pipe pile into the pile hole; and pouring solid waste crushed materials with the particle size of less than 50mm into the hollow PHC tubular pile, finally covering the pile top of the tubular pile by using a reinforced concrete cover plate, and covering a plain concrete cushion layer on the upper part of the tubular pile. The method not only has low reinforcement cost, but also can realize the reduction and the resource of the urban solid wastes.
Description
Technical Field
The invention belongs to the technical field of stratum reinforcement, and particularly relates to a sea phase mud layer reinforcement treatment method.
Background
In coastal beach areas, formations mainly comprising marine-phase silt soil layers are common, and soil bodies of the formations have the characteristics of large porosity, low shear strength, low bearing capacity and the like. In the reinforcement treatment of this kind of stickness sandy soil matter weak stratum, what apply in a large number is the compound foundation treatment technique of tubular pile, through bury precast concrete tubular pile in the ground, can restrict the mobile of secret soil layer and slide on the one hand, extrude the closely knit degree and the bearing capacity that soft soil layer improved the foundation soil, on the other hand can with the even transmission of upper portion load in the stratum that deep bearing capacity is strong. In recent years, engineers at home and abroad develop a great deal of research on the treatment of the tubular pile foundation and apply the technology to a plurality of engineering practices, thereby obtaining good engineering effect.
The Chinese iron harbour navigation bureau is used for carrying out foundation treatment on a silt layer with the average thickness of 25m in urban road engineering of a Hongwan logistics park in the Zhuhai horizontal organ area by applying prestressed high-strength concrete pipe piles, and a good effect is obtained. Aiming at the characteristic of liquefaction of the foundation in the river-cover area in China, a large amount of PHC (prestressed high-strength concrete) pipe pile foundation treatment technology is used, pile guide holes are drilled by adopting a spiral drilling operation method, and the standard penetration number is 50-75. The stress characteristics of the pile body are analyzed, so that the reasonable use of the pipe pile technology greatly improves the bearing capacity of the foundation, and the safety of the building is effectively guaranteed.
The application research of the tubular pile processing technology of the soft foundation is combined, and the application of the tubular pile processing technology is proved to improve the bearing capacity of the foundation to a certain extent, so that the tubular pile processing technology is a good choice for reinforcing the common soft stratum. However, for thick sludge soil layers with serious liquefaction, the effect of improving the bearing capacity of the foundation by adopting the conventional tubular pile soft foundation treatment technology is not obvious. Meanwhile, in order to achieve a certain reinforcing effect, the pipe diameter of the pile foundation is increased, the distance between the pipe piles is correspondingly reduced, the cost of pouring concrete is increased, and the cost of foundation treatment is obviously increased as a result.
Disclosure of Invention
The invention mainly aims to provide a marine facies mud layer reinforcement treatment method which is low in reinforcement cost and can reduce and recycle urban solid wastes.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for reinforcing a marine mud layer comprises the following steps:
s1: carrying out field leveling and excavation work on the surface of the marine facies mud layer to be subjected to foundation reinforcement;
s2: determining the arrangement space of the hollow PHC tubular piles according to engineering design requirements, and drilling pile holes by adopting a down-the-hole drill;
s3: adopting a static pile press to inject the hollow PHC pipe pile into the pile hole;
s4: and pouring solid waste crushed materials with the particle size smaller than 50mm into the hollow PHC tubular pile, finally covering the pile top of the tubular pile by using a reinforced concrete cover plate, and covering a plain concrete cushion layer at the upper part to connect all the hollow PHC tubular piles into a whole.
Specifically, the hollow PHC tubular pile is prepared from the following components in parts by weight: cementing materials, fine aggregates, coarse aggregates, reinforcing steel bars, additives, water which is 1: 1.25-1.45: 2.85-3.05: 0.46-0.50: 0.0053-0.0058: 0.30 to 0.32.
In particular, the cementing material adopts Portland cement with the strength grade not less than 42.5.
Specifically, the fine aggregate is fine river sand or desalinated sea sand with the specific surface area of 640-720m 2/kg.
Specifically, the coarse aggregate is solid waste crushed materials with the grain size of 5-25mm in continuous gradation.
Specifically, the steel bar is a spiral groove steel bar for prestressed concrete, and the tensile strength of the spiral groove steel bar is greater than 1420 Mpa.
Specifically, the concrete strength grade of the reinforced concrete cover plate is not less than C25, the thickness of the reinforcing steel bar protective layer is 50-75mm, and the concrete strength grade of the plain concrete cushion layer is C15.
Specifically, the pile hole is a vertical hole which forms an angle of 90 degrees with the ground surface, the hole depth ensures that the hollow PHC pipe pile enters a bearing stratum and is not less than 2m, and the hole diameter is 300-700 mm.
Specifically, when the ground leveling and excavation work is carried out on the marine facies mud layer surface on which foundation stabilization is to be carried out, 1m of sandy soil is filled in the upper part of the marine facies mud layer surface, and the height difference of the leveled ground is not more than 300 mm.
Specifically, hollow PHC tubular pile is formed by the concatenation of multistage festival stake, every festival the fixed steel pipe that is equipped with in bottom of festival stake, the steel pipe side sets up a plurality of pterygoid laminas, and the bottom is equipped with the tube coupling end plate, adopts tube coupling end plate welded connection when upper and lower festival stake concatenation becomes whole stake, and joint connection intensity is not less than tubular pile body intensity.
Specifically, a concrete filling core is filled in a cavity at the top of the tubular pile, and solid waste filling materials are isolated from the concrete filling core by a round isolation steel plate.
Compared with the prior art, the invention has the beneficial effects that:
1. the solid waste materials generated in the urban development process are recycled and are respectively used as the coarse aggregate of the concrete body of the PHC tubular pile and the filling body in the central cavity after being crushed in a grading way, so that the conversion of the solid waste into resource and harmless treatment is effectively promoted, the problem of the source of the coarse aggregate materials involved in the tubular pile soft foundation treatment engineering is solved to a certain extent, and the direct engineering cost is reduced.
2. By adding solid waste crushing materials into the concrete body of the tubular pile, the bearing capacity and the bending resistance of the single pile are obviously improved. According to the design requirement of road foundation reinforcement, the diameter of tubular piles can be effectively reduced on the one hand, and the distance between the tubular piles can be increased on the other hand, so that the reinforcement capability of the tubular piles on marine-facies silt soil layers is guaranteed, and the arrangement number of the tubular piles is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a PHC pile layout provided in an embodiment of the present invention;
fig. 2 is a schematic sectional view of a partial tubular pile provided in an embodiment of the present invention;
fig. 3 is a schematic view illustrating a connection between the PHC pile and the cover plate according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a pile tip structure provided in an embodiment of the present invention;
the reference signs are: 1. a top soil layer; 2. a sea phase sludge layer; 3. a sand layer in the contained pressure water; 4. a sandy soil cushion layer; 5. PHC tubular pile; 6. a reinforced concrete cover plate; 7. pile body concrete; 8. solid waste crushed material; 9. a spiral grooved steel bar; 10. a wing plate; 11. a tube-section end plate; 12. a steel pipe; 13. isolating the steel plate; 14. filling concrete into a core; 15. and (4) a plain concrete cushion layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a method for reinforcing a marine mud layer comprises the following steps:
firstly, mechanically excavating a foundation surface comprising a sand layer 3 in pressure water below an upper surface soil layer 1, a middle marine phase sludge layer 2 and a sludge layer, and filling a sandy soil cushion layer 4 with the thickness of 1m on the surface of the foundation;
step two, leveling the sand-gravel soil cushion layer 4, wherein the height difference of the leveled ground is not more than 300 mm;
thirdly, taking the leveled site as a construction site for soft foundation treatment of the PHC tubular pile 5, estimating the main consolidation settlement by adopting the compression modulus Es, and determining the diameter of the PHC tubular pile 5 for reinforcing the marine phase sludge layer 2 to be 300-500mm according to engineering design and quality requirements, wherein the pile spacing can be properly increased to be 3.5-4.0m compared with the conventional PHC tubular pile 5;
drilling pile holes on a construction working surface by using a down-the-hole drill according to the pipe pile arrangement parameters determined in the step three, wherein the pile holes are vertical holes vertical to the horizontal plane, and the hole depth ensures that the PHC pipe piles 5 enter a sand layer 3 containing pressure bearing water and is not less than 2 m;
step five, preparing the PHC tubular pile 5 by taking a cementing material, aggregate, reinforcing steel bars, a concrete admixture and water as main components based on the following steps: cementing materials, fine aggregates, coarse aggregates, reinforcing steel bars, additives, water which is 1: 1.25-1.45: 2.85-3.05: 0.46-0.50: 0.0053-0.0058: preparing a hollow PHC tubular pile 5 according to the mass ratio of 0.30-0.32;
wherein: the cementing material can adopt Portland cement with the strength grade not less than 42.5; the fine aggregate can adopt fine river sand with the specific surface area of 640-720m2/kg or desalinated sea sand; the coarse aggregate can be solid waste crushed material 8 with the grain size of 5-25mm in continuous gradation; the steel bar can adopt a spiral groove steel bar 9 for prestressed concrete, and the tensile strength of the spiral groove steel bar is more than 1420 MPa; the concrete admixture can adopt conventional well-known admixture; the requirement of the concrete mixing water meets the regulation of JGJ 63.
And step six, performing a bending test on the prepared hollow PHC tubular pile 5 by adopting a simply supported beam symmetric loading device, and performing a uniaxial compression test on the compressive strength of the concrete.
And step seven, a static pile press is adopted to inject the hollow PHC tubular pile 5 meeting the design requirements in the step six into the pile hole in the step two.
Pouring solid waste crushed materials 8 with the particle size smaller than 50mm into the hollow PHC tubular pile 5, finally covering the top of the tubular pile by using a reinforced concrete cover plate 6, and covering a plain concrete cushion layer with the thickness of 400mm on the upper part to connect all the hollow PHC tubular piles into a whole.
The cover plate concrete strength grade is not less than C25, the thickness of the steel bar protection layer is 50-75mm, the cushion layer concrete strength grade is C15, the hollow PHC tubular pile is formed by splicing multiple sections of piles, a steel pipe is fixedly arranged at the bottom of each section of pile, a plurality of wing plates are arranged on the side edge of the steel pipe, a pipe section end plate is arranged at the bottom end of the steel pipe, the upper section of pile and the lower section of pile are welded and connected into a whole pile, and the joint connection strength is not less than the pile body strength of the tubular pile.
The present invention will be further described in detail with reference to specific operation examples:
the soft soil foundation treatment of a road in a certain coastal region shows that the thickness of a surface soil layer 1 is 0.5-1.2m, the revealing depth of a sea phase sludge layer 2 is 15-41.5m, the distribution is wide and uneven, and a sand layer 3 containing pressure-bearing water is arranged below the sludge layer. According to design requirements, the road does not have large settlement and uneven settlement within the service life, and the maximum settlement value within 15 years of the service life is less than 50 cm.
The specific implementation steps are as follows:
step one, as shown in figure 1, mechanically excavating a surface soil layer 1 with the upper part of 0.5-1.2m in thickness and filling a sand-stone soil cushion layer 4 with the thickness of 1 m;
step two, leveling the sandy soil cushion layer 4, wherein the height difference of the leveled ground is not more than 200 mm;
thirdly, taking the leveled field as a construction field for soft foundation treatment of the PHC tubular pile 5, estimating the main consolidation settlement by adopting the compression modulus Es, and determining the diameter of the PHC tubular pile 5 for reinforcing the marine phase sludge layer 2 to be 400mm and the pile spacing to be 4.0m according to engineering design and quality requirements;
drilling pile holes on a construction working surface by using a down-the-hole drill according to the pipe pile arrangement parameters determined in the step three, wherein the pile holes are vertical holes vertical to the horizontal plane, the hole depth ensures that the PHC pipe pile 5 enters a sand layer 3 containing pressure bearing water and is not less than 2m, and the pile hole depth is 28 m;
step five, preparing the PHC tubular pile 5 by taking a cementing material, aggregate, reinforcing steel bars, a concrete admixture and water as main components based on the following steps: cementing materials, fine aggregates, coarse aggregates, reinforcing steel bars, additives, water which is 1: 1.30: 2.9: 0.50: 0.0055: preparing a hollow PHC tubular pile 5 according to the mass ratio of 0.31;
step six, preparing the PHC tubular pile 5 by using a cementing material which is Portland cement with the strength grade not less than 42.5; the fine aggregate is desalted sea sand with the specific surface area of 680m 2/kg; the coarse aggregate is solid waste crushed material 8 with the grain size of 5-25mm in continuous gradation; the steel bar is a spiral groove steel bar 9 for prestressed concrete, and the tensile strength of the spiral groove steel bar is greater than 1420 MPa; the concrete admixture has the characteristics of reinforcement, water absorption, corrosion resistance and the like; the concrete-stirring water is selected from tap water of industrial sites satisfying the specification of JGJ 63.
And seventhly, performing a bending resistance test on the prepared hollow PHC tubular pile by adopting a simply supported beam symmetric loading device after 5-day maintenance for 28 days, and performing a uniaxial compression test on the compressive strength of the pile body concrete 7.
Eighthly, pouring a reinforced concrete cover plate 6 with the size of 2m multiplied by 0.4m for the hollow PHC tubular pile 5, wherein the strength grade of the cover plate concrete is not less than C25, the thickness of the reinforcing steel bar protective layer is 50mm, and the strength grade of the cushion concrete is C15;
and step nine, reinforcing the pile holes with the hole depth of 28m by adopting a splicing mode of the PHC tubular piles 5. The bottom of the pile tip is provided with an A-shaped pipe joint end plate 11 and a steel pipe 12 with the diameter of 10mm, the side edge of the pile tip is provided with four wing plates 10 with the diameter of 10mm, the upper pile section and the lower pile section are welded and connected by the pipe joint end plate 11 when being spliced into a whole pile, and the joint connection strength is not less than the pile body strength of the pipe pile.
Step ten, a static pile press is adopted to inject the hollow PHC tubular pile 5 meeting the design requirement in the step ten into the pile hole in the step two.
Eleventh, pouring solid waste crushed materials 8 with the particle size smaller than 50mm into the hollow PHC tubular pile 5 which is penetrated into the pile hole in the ninth step, finally connecting the reinforced concrete cover plate in the eighth step with the PHC tube in the step 3, filling concrete filling cores 14 into the cavity at the top of the tubular pile, isolating the solid waste filling materials 8 and the concrete filling cores 14 by round isolation steel plates 13, and covering the top of the tubular pile with a 400mm thick C15 plain concrete cushion layer 15 which is formed in the eleventh step after the connection is finished. Table 1 shows the comparison of the bearing capacity value of the foundation after the invention is adopted with the bearing capacity value data of the common pile.
TABLE 1
Compared with the characteristic value of a common pile, the characteristic value of the horizontal bearing capacity of the PHC tubular pile adopting the method is averagely improved by 27.27%, and the standard value of the extreme side resistance is improved by 35.03%.
The method for reinforcing the marine-facies sludge layer provided by the embodiment of the application has the following advantages:
1. the solid waste materials generated in the urban development process are recycled and are respectively used as the coarse aggregate of the concrete body of the PHC tubular pile and the filling body in the central cavity after being crushed in a grading way, so that the conversion of the solid waste into resource and harmless treatment is effectively promoted, the problem of the source of the coarse aggregate materials involved in the tubular pile soft foundation treatment engineering is solved to a certain extent, and the direct engineering cost is reduced.
2. By adding solid waste crushing materials 8 into the concrete body of the tubular pile, the bearing capacity and the bending resistance of the single pile are obviously improved. According to the design requirement of road foundation reinforcement, the diameter of tubular piles can be effectively reduced on the one hand, and the distance between the tubular piles can be increased on the other hand, so that the reinforcement capability of the tubular piles on marine-facies silt soil layers is guaranteed, and the arrangement number of the tubular piles is reduced.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A method for reinforcing a marine mud layer is characterized by comprising the following steps:
s1: carrying out field leveling and excavation work on the surface of the marine facies mud layer to be subjected to foundation reinforcement;
s2: determining the arrangement space of the hollow PHC tubular piles according to engineering design requirements, and drilling pile holes by adopting a down-the-hole drill;
s3: adopting a static pile press to inject the hollow PHC pipe pile into the pile hole;
s4: and pouring solid waste crushed materials with the particle size smaller than 50mm into the hollow PHC tubular pile, finally covering the pile top of the tubular pile by using a reinforced concrete cover plate, and covering a plain concrete cushion layer at the upper part to connect all the hollow PHC tubular piles into a whole.
2. The marine mud layer reinforcement treatment method according to claim 1, wherein the hollow PHC tubular pile is prepared from the following components in parts by weight: cementing materials, fine aggregates, coarse aggregates, reinforcing steel bars, additives, water which is 1: 1.25-1.45: 2.85-3.05: 0.46-0.50: 0.0053-0.0058: 0.30 to 0.32.
3. The method for consolidating marine mud layer according to claim 2, wherein said cementitious material is Portland cement having a strength grade of not less than 42.5.
4. The sea phase mud layer reinforcement treatment method according to claim 2, characterized in that the fine aggregate is fine river sand or desalinated sea sand with a specific surface area of 640-720m 2/kg.
5. The sea mud layer reinforcement treatment method according to claim 2, wherein the coarse aggregate is solid waste crushed materials with a continuous grading of 5-25mm in particle size.
6. The method for reinforcing the marine facies mud layer of claim 2 wherein the steel reinforcement is a spiral groove steel bar for prestressed concrete having a tensile strength greater than 1420 MPa.
7. The marine facies mud layer reinforcement treatment method of any one of claims 1 to 6, wherein the concrete strength grade of the reinforced concrete cover plate is not less than C25, the thickness of the reinforcing steel bar protective layer is 50-75mm, and the concrete strength grade of the plain concrete cushion layer is C15.
8. The marine mud layer reinforcement method as claimed in any one of claims 1 to 6, wherein the pile hole is a vertical hole having an angle of 90 ° with the ground surface, and the hole depth ensures that the hollow PHC pipe pile enters the bearing stratum with an aperture of 300-700mm and a depth of 2 m.
9. The marine vessel mud layer reinforcement processing method as claimed in any one of claims 1 to 6, wherein when carrying out site leveling and excavation work on the marine vessel mud layer surface to be subjected to foundation reinforcement, 1m of sandy soil is filled in the upper part and the height difference of the leveled surface is not more than 300 mm.
10. The marine facies mud layer strengthening treatment method according to any one of claims 1 to 6, wherein the hollow PHC tubular pile is formed by splicing a plurality of sections of piles, a steel pipe is fixedly arranged at the bottom of each section of pile, a plurality of wing plates are arranged on the side edge of the steel pipe, a pipe section end plate is arranged at the bottom end of the steel pipe, the upper section of pile and the lower section of pile are welded together by adopting the pipe section end plates when being spliced into a whole pile, and the joint connection strength is not less than the pile body strength of the tubular pile.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1621626A (en) * | 2004-12-28 | 2005-06-01 | 王继忠 | Construction method for concrete pile |
| CN103641400A (en) * | 2013-11-25 | 2014-03-19 | 江苏东浦管桩有限公司 | Energy-saving low-carbon method for producing tubular pile |
| CN109487837A (en) * | 2018-11-15 | 2019-03-19 | 广东固易特种工程有限公司 | A kind of inclination of pile for prestressed pipe is rectified a deviation back positive construction method |
| CN210238178U (en) * | 2019-06-26 | 2020-04-03 | 西安公路研究院 | Siltation soil reinforcing and treating device |
-
2021
- 2021-01-14 CN CN202110047301.XA patent/CN112854177A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1621626A (en) * | 2004-12-28 | 2005-06-01 | 王继忠 | Construction method for concrete pile |
| CN103641400A (en) * | 2013-11-25 | 2014-03-19 | 江苏东浦管桩有限公司 | Energy-saving low-carbon method for producing tubular pile |
| CN109487837A (en) * | 2018-11-15 | 2019-03-19 | 广东固易特种工程有限公司 | A kind of inclination of pile for prestressed pipe is rectified a deviation back positive construction method |
| CN210238178U (en) * | 2019-06-26 | 2020-04-03 | 西安公路研究院 | Siltation soil reinforcing and treating device |
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