CN114457833B - Pile foundation structure capable of being reinforced on coral sand and method - Google Patents
Pile foundation structure capable of being reinforced on coral sand and method Download PDFInfo
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- CN114457833B CN114457833B CN202210157971.1A CN202210157971A CN114457833B CN 114457833 B CN114457833 B CN 114457833B CN 202210157971 A CN202210157971 A CN 202210157971A CN 114457833 B CN114457833 B CN 114457833B
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- 239000004576 sand Substances 0.000 title claims abstract description 43
- 235000014653 Carica parviflora Nutrition 0.000 title claims abstract description 41
- 241000243321 Cnidaria Species 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 94
- 239000010959 steel Substances 0.000 claims abstract description 94
- 238000010276 construction Methods 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims abstract description 7
- 239000004568 cement Substances 0.000 claims description 54
- 238000005086 pumping Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 abstract description 3
- 238000007569 slipcasting Methods 0.000 description 12
- 230000003014 reinforcing effect Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/08—Removing obstacles
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- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a pile foundation structure and a method capable of being reinforced on coral sand.A central reserved pipe system for grouting or sucking slurry from the center of a steel pipe pile body is arranged at the central part of the steel pipe pile body; the central reserved pipe system is communicated with the pile bottom of the steel pipe pile main body so as to realize grouting to the pile bottom; and a side grouting pipe system for grouting or sucking slurry outside the steel pipe pile body is arranged in the steel pipe pile body. This pile foundation structure easy operation just is convenient for develop implementation experiment, makes weak soil fast and is firm, reaches the standard that can be under construction, can solve the subsidence of pile foundation and building, is favorable to the superstructure firm, can improve the stability of pile foundation through the combination of the frictional force in every aspect of pile foundation, combines the advantage of friction pile and end bearing stake, reduces the subsidence.
Description
Technical Field
The invention belongs to the technical field of coral sand geological pile foundation, and particularly relates to a pile foundation structure capable of being reinforced on coral sand and a method.
Background
In recent years, economic and social developments make people pay more and more attention to the quality of the building on the basis of pursuing the service performance of the building, and with the increasing of high-rise buildings, the requirements on the building foundation are also higher and higher, so that pile foundation is also developed greatly. However, in practical construction, there are still many technical problems to be solved, because shallow stratum is soft, bearing capacity is lower, natural foundation deformation is large, therefore, the load is larger, the requirement on the pile foundation is more strict for buildings with strict deformation requirement, general pile foundations are easy to subside under soft foundations such as coral sand, the pile foundations are abandoned after collapse due to the unaware of underground soil, waste is caused, the pile foundations are not easy to reutilize, and re-punch, expensive cost is required, the follow-up work is not facilitated, the method of firm pile foundations is single, the treatment of various conditions is not facilitated, the single grouting method is not beneficial to solving the problems in various conditions, the grouting method of the same pile foundations is different, the result is not beneficial to the stability of the pile foundations, the phenomenon that the pile foundations are unstable under the soft foundations is caused by the proportion of the expanded cement, the degree of the coral sand is influenced by the proportion, the coral sand is not damaged due to the too large proportion, the pile foundations are not easy to be beneficial to the compaction of the coral sand around the pile foundations, the pile foundations are easy to be damaged due to the inclination and the sedimentation of the general pile foundations are easy to be damaged, the pile foundations are also limited, the reinforcement is easy to be damaged due to the high bearing capacity, and the reinforcement is too much is easy to cause.
Disclosure of Invention
In order to solve the technical problems, the invention provides the pile foundation structure and the method which can be reinforced on coral sand, the pile foundation structure is simple to operate and convenient to carry out experiments, soft soil is fast and firm, the standards which can be constructed can be reached, settlement of pile foundations and buildings can be solved, upper-layer building stability is facilitated, stability of pile foundations can be improved through combination of friction force on all aspects of pile foundations, advantages of friction piles and end bearing piles are combined, settlement is reduced, and the pile foundation structure has the purposes of reducing cost, facilitating smooth injection of slurry, fast construction, improving engineering efficiency, facilitating subsequent engineering and further improving construction.
In order to achieve the technical characteristics, the aim of the invention is realized in the following way: the utility model provides a pile foundation structure that can strengthen on coral sand, it includes the steel-pipe pile main part, the central part of steel-pipe pile main part is provided with the central reservation pipe system that is used for from the central slip casting of steel-pipe pile main part or suction mud;
the central reserved pipe system is communicated with the pile bottom of the steel pipe pile main body so as to realize grouting to the pile bottom;
and a side grouting pipe system for grouting or sucking slurry outside the steel pipe pile body is arranged in the steel pipe pile body.
The central reserved pipe system adopts a sectional type central grouting system, the sectional type central grouting system comprises a first central pipe positioned at the central part of the upper part of the steel pipe pile main body, a bottom plugging plate is fixed at the bottom end of the first central pipe, a plurality of bottom plate communication holes are processed on the bottom plugging plate, and a second central pipe and a plurality of circles of central inclined pipes which are obliquely arranged are fixed at the bottom end of the bottom plugging plate and are communicated with the corresponding bottom plate communication holes; the second central pipe and the central inclined pipe are communicated with the bottom end of the steel pipe pile body.
The central reservation pipe system adopts an integrated multi-branch type central grouting system, and the integrated multi-branch type central grouting system comprises a plurality of rings of third central pipes positioned inside the steel pipe pile body, and all the third central pipes are arranged along the length direction of the steel pipe pile body and penetrate through the whole steel pipe pile body.
And a plurality of first reinforcing steel hoops are fixedly connected between the top and the bottom of the third central pipe by welding.
The top and the bottom of the third central pipes are fixedly connected by adopting a connecting plate, and through holes communicated with the third central pipes are formed in the connecting plate.
The side grouting pipe system adopts a combined side grouting system, the combined side grouting system comprises a plurality of side main pipes penetrating through the whole steel pipe pile main body, a plurality of short inclined pipes are communicated with the side main pipes, and the short inclined pipes are communicated with the outer sides of the steel pipe pile main bodies.
The side grouting pipe system adopts an integrated side grouting system, the integrated side grouting system comprises a plurality of circles of long inclined pipes which are arranged at different inclined angles, the top ends of the long inclined pipes are communicated with the top end surface of the steel pipe pile main body, and the bottom ends of the long inclined pipes are communicated with the outer side surface of the steel pipe pile main body; the top ends of the long inclined pipes positioned at the same circumference position are fixedly connected through a second reinforcing steel bar hoop.
The central reservation pipe system and the side grouting pipe system adopt communicated grouting systems, the communicated grouting systems comprise a fourth central pipe arranged at the central part of the steel pipe pile body, one end of the fourth central pipe is communicated with the fourth central pipe, and the other end of the fourth central pipe is communicated with the outer side of the steel pipe pile body.
The sectional type central grouting system and the integrated multi-branch type central grouting system of the central reserved pipe system are combined with the combined type side grouting system and the integrated type side grouting system of the side grouting pipe system.
The construction method of the pile foundation structure on the coral sand comprises the following steps:
step 1, preparing materials: preparing steel pipes, steel bars and steel plate materials required for preparing a central reserved pipe system and a side grouting pipe system, and preparing expansion cement paste and cement paste required for subsequent pouring;
step 2, supporting a die: selecting and making a specific combined structural form of a central reserved pipe system and a side grouting pipe system, and forming a skeleton structure of the steel pipe pile main body after combination;
step 3, pile body pouring of the steel pipe pile main body: pouring cement in the die of the steel pipe pile main body in the step 2, compacting the cement, and taking care that in the cement pouring process, the pipe orifice parts of the central reserved pipe system and the side grouting pipe system are plugged by a cover plate to prevent the cement from blocking the pipeline;
and 4, pile hole construction of the coral sand foundation: performing pile hole construction on the coral sand foundation by using an impact pile machine, vertically driving the poured steel pipe pile body into the pile hole by using a ramming machine, filling up gaps of the pile foundation by using soil, and filling up the gaps of the pile foundation firmly;
step 5, extracting scraps: pumping out mud permeated into the central reserved pipe system and the side grouting pipe system by adopting a sand pumping machine, checking whether pumping out is finished, checking whether blocking is caused, and compacting the bottom;
step 6, grouting the bottom of the pile foundation: injecting expansion cement with small proportion into the steel pipe of the central reserved pipe system close to the center of the circle by using the grouting pipe, then injecting expansion cement with large proportion into the steel pipe outside the center of the circle, increasing the proportion of the expansion cement, compacting the expansion cement, and forming a bottom expansion area;
step7, side grouting: injecting expansion cement with different proportions into the steel pipes with different heights on the side surfaces through a side surface grouting pipe system by using a grouting pipe through symmetrical grouting, wherein the proportion of the expansion cement is larger as the expansion cement is closer to the top, and filling the pipeline completely;
step8, repeating Step7, and so on, performing the next grouting, fully filling the side grouting pipe system, and compacting the side grouting pipe system; forming a side expansion region on the outer side of the steel pipe pile body;
step9: backfilling: the remaining gaps are filled and compacted continuously.
The invention has the following beneficial effects:
1. the pile foundation structure can reduce cost, is simple to operate and convenient to carry out experiments, quickly enables soft soil to be firm, achieves the standard of construction, can solve the problem of settlement of pile foundations and buildings, is favorable for stabilizing an upper layer building, can improve the stability of the pile foundations through the combination of friction force on all aspects of the pile foundations, combines the advantages of friction piles and end bearing piles, reduces settlement, has the purposes of reducing cost, facilitating smooth injection of slurry and quick construction, improves the efficiency of engineering, is favorable for the following engineering, further improves the construction, increases the bottom area, reduces the bottom pressure intensity, reduces the settlement, enhances the bearing property and stability of the pile foundations and reduces the cost.
2. The coral sand around the pile foundation is compacted but not broken through the expansion cement with different proportions to form a whole, the firmness of the pile foundation is improved, different blocks can be produced around the pile foundation with different heights to achieve the effect of reinforcing the pile foundation, different grouting modes can be adopted according to different geological conditions under different conditions, different grouting environments are adapted, the time is reduced, the working efficiency is improved, the bearing capacity and the shearing resistance of the steel bar can be improved to a certain extent by replacing the steel bar by the steel tube, the stability of the pile foundation is improved, and the settlement of the pile foundation is reduced.
3. Make the coral sand around the pile foundation through to diversified slip casting more durable, can take different slip casting modes in the construction environment of difference, adapt to multiple different construction environment, convenient and fast more has improved the efficiency of construction, also the ratio of accessible adjustment expansion cement, and then improve the stability of pile foundation, reach the purpose of not squeezing broken coral sand, reduce the waste of pile foundation, can ratio different expansion cement through the slip casting pipe, make the coral sand form crowded close and not crowded broken piece thing, reach the whole balanced and steady state of pile foundation.
4. The pile foundation structure of the invention leaves space for grouting, is convenient for injecting expansion cement slurry, so that the bottom is stressed at a plurality of positions, coral sand at the bottom is squeezed, the bearing capacity of the pile foundation is improved, different blocks are convenient to form at all positions of the bottom, and the bearing capacity is improved; through reserving the space of side slip casting, be favorable to side many places atress, improve side frictional force, the pipeline is connected with the steel pipe, the stability of the slip casting pipe of increase side can pour into the expansion cement paste of different proportions of co-altitude in proper order.
5. The center of the bottom is formed into a broad end through a central reserved pipe system, so that an end bearing pile is formed, the bearing capacity of the bottom is increased, the sedimentation of a pile foundation is reduced, the overall stability is improved, the stability of the pile foundation is improved, the compactness of the bottom is improved, the stress of the bottom is uniform, and the supporting force of the bottom is improved; the coral sand on the side is squeezed by the side grouting pipe system, the side forms blocks, different stresses at different heights are different, the stress at the same height is uniform, the stability of the pile foundation is improved, and the conditions of high stress below the pile foundation and low stress above the pile foundation are formed.
6. By adopting the steel pipe pile to replace the steel bars of the foundation, the compactness of the foundation is enhanced, the strength of the pile foundation is enhanced, the support force is stronger, the compression resistance degree of the steel bars is enhanced, the resistance of the pile foundation is enhanced, the bearing capacity of the pile foundation is enhanced, and the cost of the foundation is reduced.
7. The speed of distributing different expansion cements is improved, the expansion cements with different proportions can be rapidly injected, the grouting pipe is injected with the expansion cement with the same proportion at one time, the operation is convenient, and the improvement of the working efficiency is facilitated.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a top view of the overall device of the present invention.
FIG. 2 shows a pile foundation structure of a combination of a segmented center grouting system and a combined side grouting system according to the present invention.
Fig. 3 is a system configuration of the lower structure of the sectional type center grouting system of fig. 2 according to the present invention.
FIG. 4 shows a pile foundation structure of the combination of the segmented center grouting system and the integrated side grouting system of the present invention.
Fig. 5 shows a pile foundation structure of the combination of the integrated manifold-type central grouting system and the integrated side grouting system of the present invention.
Fig. 6 is a top view of the integrated manifold-type central grouting system of fig. 5 using a connection plate as a connection structure according to the present invention.
FIG. 7 shows a pile foundation structure of the communication type grouting system of the present invention.
Fig. 8 is a diagram showing the overall construction of the pile foundation structure of fig. 4 after grouting in accordance with the present invention.
In the figure: a steel pipe pile main body 1, a central reserved pipe system 2, a side grouting pipe system 3, a side expansion area 4 and a bottom expansion area 5;
a first central tube 201, a bottom plugging plate 202, a bottom plate communication hole 203, a central inclined tube 204, a second central tube 205, a third central tube 206, a first reinforcing steel bar hoop 207, a fourth central tube 208, and a connecting plate 209;
side main pipe 301, short inclined pipe 302, second reinforcing steel hoop 303, long inclined pipe 304.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1 to 8, a pile foundation structure which can be reinforced on coral sand comprises a steel pipe pile body 1, wherein a central reserved pipe system 2 for grouting or pumping slurry from the center of the steel pipe pile body 1 is arranged at the central part of the steel pipe pile body 1; the central reserved pipe system 2 is communicated with the pile bottom of the steel pipe pile main body 1 so as to realize grouting to the pile bottom; the inside of the steel pipe pile body 1 is provided with a side grouting pipe system 3 for grouting or sucking mud outside the steel pipe pile body 1. Through adopting foretell pile foundation structure, reserve the pile foundation of pipe system 2 and side slip casting pipe system 3 through reserving the center, leave the space of slip casting for the pile foundation, be convenient for follow-up slip casting, the coral sand of direct bottom, be convenient for slip casting injection to bottom coral sand and take out coral sand, can make the bottom pour into the expansion cement of different proportions into. The bottom is settled and firm, and friction piles are formed on the side surfaces, so that the settlement of pile foundations is reduced. It is mainly applied to coral sand foundation.
Further, the central reservation pipe system 2 adopts a sectional type central grouting system, the sectional type central grouting system comprises a first central pipe 201 positioned at the central part of the upper part of the steel pipe pile main body 1, the bottom end of the first central pipe 201 is fixed with a bottom plugging plate 202, a plurality of bottom plate communication holes 203 are processed on the bottom plugging plate 202, and a second central pipe 205 and a plurality of circles of central inclined pipes 204 which are obliquely arranged are fixed at the positions of the bottom end of the bottom plugging plate 202 and communicated with the corresponding bottom plate communication holes 203; the second center pipe 205 and the center inclined pipe 204 communicate with the bottom end of the steel pipe pile body 1. Through adopting the central slip casting system of sectional type its aim at to make bottom everywhere atress, form the end-bearing stake, the atress of increase bottom makes the bottom form the piece, increases the holding power of bottom to the pile foundation, improves the stability of pile foundation, forms the piece of equidimension and then constitutes a whole, reduces the subsidence of pile foundation.
Further, the central reservation pipe system 2 adopts an integrated multi-branch type central grouting system, and the integrated multi-branch type central grouting system comprises a plurality of third central pipes 206 positioned inside the steel pipe pile body 1, and all the third central pipes 206 are arranged along the length direction of the steel pipe pile body 1 and penetrate through the whole steel pipe pile body 1. The method aims at conveniently reserving a hollow pile foundation, leaving grouting space for the pile foundation, facilitating subsequent grouting, directly connecting coral sand at the bottom, facilitating grouting injection to the bottom coral sand and extraction of the coral sand, and enabling the bottom to be injected with expansion cement with different proportions.
Further, the top and bottom ends of the third central tubes 206 are fixedly connected by welding with a plurality of first hoops 207. The connection of the third center tube 206 can be achieved by the first reinforcing bar hoop 207 described above.
Further, the top and bottom ends of the third central tubes 206 are fixedly connected by a connecting plate 209, and through holes for communicating with the third central tubes 206 are formed in the connecting plate 209.
Further, through adopting the steel pipe, its aim at can replace the reinforcing bar, forms more hard reinforcing bar, improves the bearing capacity of pile foundation, improves the shearing resistance and the bearing capacity of reinforcing bar, improves the stability of pile foundation, provides the space for transportation expansion cement, provides the slip casting space.
Further, the side grouting pipe system 3 adopts a combined side grouting system, and the combined side grouting system comprises a plurality of side main pipes 301 penetrating through the whole steel pipe pile body 1, a plurality of short inclined pipes 302 are communicated on the side main pipes 301, and the short inclined pipes 302 are communicated with the outer side of the steel pipe pile body 1. The side grouting pipe system 3 is used for casting the side of the pile foundation to form a block, so that surrounding coral sand is integrated, compacted but not broken, the friction force of the side is increased, a friction pile is formed, the sedimentation of the side is reduced, and the stability of the pile foundation is improved.
Further, the side grouting pipe system 3 adopts an integrated side grouting system, the integrated side grouting system comprises a plurality of circles of long inclined pipes 304 which are arranged at different inclined angles, the top ends of the long inclined pipes 304 are communicated with the top end surface of the steel pipe pile main body 1, and the bottom ends of the long inclined pipes 304 are communicated with the outer side surface of the steel pipe pile main body 1; the top ends of the long inclined pipes 304 located at the same circumferential position are fixedly connected by a second reinforcing bar hoop 303.
Further, the central reservation pipe system 2 and the side grouting pipe system 3 adopt a communicated grouting system, the communicated grouting system comprises a fourth central pipe 208 arranged at the central part of the steel pipe pile main body 1, one end of the fourth central pipe 208 is communicated with the fourth central pipe 208, and the other end is communicated with the outer side of the steel pipe pile main body 1.
Further, the sectional type center grouting system and the integrated manifold type center grouting system of the center reservation pipe system 2 are used in combination with the combined type side grouting system and the integrated type side grouting system of the side grouting pipe system 3.
Further, by adopting the expansion cement with different proportions, the purpose of the expansion cement is that the expandable cement with different proportions can enable different positions to bear different forces to form different blocks, different positions are stressed differently, the friction force between the bottom and the side is increased, and the bearing property of the pile foundation is improved.
Example 2:
the construction method of the pile foundation structure on the coral sand comprises the following steps:
step 1, preparing materials: preparing steel pipes, steel bars and steel plate materials required for preparing the central reserved pipe system 2 and the side grouting pipe system 3, and preparing expansion cement paste and cement paste required for subsequent pouring;
step 2, supporting a die: selecting and making a specific combined structural form of the central reserved pipe system 2 and the side grouting pipe system 3, and forming a skeleton structure of the steel pipe pile main body 1 after combination;
step 3, pile body pouring of the steel pipe pile main body 1: pouring cement in the die of the steel pipe pile main body 1 in the step 2, compacting the cement, and taking care that in the cement pouring process, the pipe orifice parts of the central reserved pipe system 2 and the side grouting pipe system 3 are plugged by a cover plate to prevent the cement from blocking a pipeline;
and 4, pile hole construction of the coral sand foundation: performing pile hole construction on the coral sand foundation by using an impact pile machine, vertically driving the poured steel pipe pile body 1 into the pile hole by using a ramming machine, filling up gaps of the pile foundation by using soil, and filling up the gaps of the pile foundation firmly;
step 5, extracting scraps: pumping out mud permeated into the central reserved pipe system 2 and the side grouting pipe system 3 by adopting a sand pumping machine, checking whether pumping out is finished, checking whether blocking is caused, and compacting the bottom;
step 6, grouting the bottom of the pile foundation: injecting expansion cement with small proportion into the steel pipe close to the center of the central reserved pipe system 2 by using a grouting pipe, then injecting expansion cement with large proportion into the steel pipe outside the center of the center, increasing the proportion of the expansion cement, compacting the expansion cement, and forming a bottom expansion zone 5;
step7, side grouting: injecting expansion cement with different proportions into the steel pipes with different heights on the side surfaces through the side surface grouting pipe system 3 by using a grouting pipe through symmetrical grouting, wherein the proportion of the expansion cement is larger as the expansion cement is closer to the top, and filling the pipeline completely;
step8, repeating Step7, and so on, performing the next grouting, filling the side grouting pipe system 3 completely, and compacting the side grouting pipe system; and forming a side expansion zone 4 on the outer side of the steel pipe pile body 1;
step9: backfilling: the remaining gaps are filled and compacted continuously.
Claims (7)
1. The construction method of the pile foundation structure capable of being reinforced on coral sand comprises a steel pipe pile body (1), wherein a central reserved pipe system (2) for grouting or sucking slurry from the center of the steel pipe pile body (1) is arranged at the central part of the steel pipe pile body (1);
the central reserved pipe system (2) is communicated with the pile bottom of the steel pipe pile main body (1) so as to realize grouting to the pile bottom;
a side grouting pipe system (3) for grouting or sucking slurry outside the steel pipe pile body (1) is arranged inside the steel pipe pile body (1);
the construction method is characterized by comprising the following steps of:
step 1, preparing materials: preparing steel pipes, steel bars and steel plate materials required for preparing a central reserved pipe system (2) and a side grouting pipe system (3), and preparing expansion cement paste and cement paste required for subsequent pouring;
step 2, supporting a die: a specific combined structure form of the central reserved pipe system (2) and the side grouting pipe system (3) is selected and formulated, and a skeleton structure of the steel pipe pile main body (1) is formed after the combination;
step 3, pile body pouring of the steel pipe pile main body (1): pouring cement in the die of the steel pipe pile main body (1) in the step 2, compacting the cement, and blocking the pipe orifice parts of the central reserved pipe system (2) and the side grouting pipe system (3) by adopting a cover plate in the cement pouring process to prevent the cement from blocking a pipeline;
and 4, pile hole construction of the coral sand foundation: performing pile hole construction on the coral sand foundation by using an impact pile machine, vertically driving the poured steel pipe pile body (1) into the pile hole by using a ramming machine, filling up gaps of the pile foundation by using soil, and filling up the gaps of the pile foundation firmly;
step 5, extracting scraps: pumping out mud permeated into the central reserved pipe system (2) and the side grouting pipe system (3) by adopting a sand pumping machine, checking whether the pumping out is finished, checking whether the pumping out is blocked or not, and compacting the bottom;
step 6, grouting the bottom of the pile foundation: injecting small-proportion expansion cement into the steel pipe close to the center of the center reservation pipe system (2) by using a grouting pipe, injecting large-proportion expansion cement into the steel pipe outside the center of the center, increasing the proportion of the expansion cement, compacting the expansion cement, and forming a bottom expansion area (5);
step7, side grouting: injecting expansion cement with different proportions into the steel pipes with different height positions on the side surfaces through a side surface grouting pipe system (3) by using a grouting pipe through symmetrical grouting, wherein the proportion of the expansion cement is larger as the expansion cement is closer to the top, and filling the pipeline completely;
step8, repeating the step7, and so on, performing the next grouting, fully filling the side grouting pipe system (3), and compacting the side grouting pipe system; and forming a side expansion zone (4) on the outer side of the steel pipe pile body (1);
step9: backfilling: the remaining gaps are filled and compacted continuously.
2. A method of constructing a pile foundation structure reinforced on coral sand as defined in claim 1, wherein: the central reserved pipe system (2) adopts a sectional type central grouting system, the sectional type central grouting system comprises a first central pipe (201) positioned at the central part of the upper part of the steel pipe pile main body (1), a bottom plugging plate (202) is fixed at the bottom end of the first central pipe (201), a plurality of bottom plate communication holes (203) are processed on the bottom plugging plate (202), and a second central pipe (205) and a plurality of circles of central inclined pipes (204) which are obliquely arranged are fixed at the positions of the bottom end of the bottom plugging plate (202) and communicated with the corresponding bottom plate communication holes (203); the second central pipe (205) and the central inclined pipe (204) are communicated with the bottom end of the steel pipe pile body (1).
3. A method of constructing a pile foundation structure reinforced on coral sand as defined in claim 1, wherein: the central reservation pipe system (2) adopts an integrated multi-branch type central grouting system, and the integrated multi-branch type central grouting system comprises a plurality of rings of third central pipes (206) positioned inside the steel pipe pile body (1), and all the third central pipes (206) are arranged along the length direction of the steel pipe pile body (1) and penetrate through the whole steel pipe pile body (1).
4. A method of constructing a pile foundation structure reinforced on coral sand as defined in claim 3, wherein: the top and the bottom ends of the third central pipes (206) are fixedly connected by adopting a plurality of circles of first steel bar hoops (207) in a welding way.
5. A method of constructing a pile foundation structure reinforced on coral sand as defined in claim 3, wherein: the top and the bottom of the third central tubes (206) are fixedly connected by adopting a connecting plate (209), and through holes communicated with the third central tubes (206) are formed in the connecting plate (209).
6. A method of constructing a pile foundation structure reinforced on coral sand as defined in claim 1, wherein: the side grouting pipe system (3) adopts a combined side grouting system, the combined side grouting system comprises a plurality of side main pipes (301) penetrating through the whole steel pipe pile body (1), a plurality of short inclined pipes (302) are communicated on the side main pipes (301), and the short inclined pipes (302) are communicated with the outer sides of the steel pipe pile body (1).
7. A method of constructing a pile foundation structure reinforced on coral sand as defined in claim 1, wherein: the side grouting pipe system (3) adopts an integrated side grouting system, the integrated side grouting system comprises a plurality of circles of long inclined pipes (304) which are arranged at different inclined angles, the top ends of the long inclined pipes (304) are communicated with the top end surface of the steel pipe pile main body (1), and the bottom ends of the long inclined pipes (304) are communicated with the outer side surface of the steel pipe pile main body (1); the top ends of the long inclined pipes (304) positioned at the same circumference position are fixedly connected through a second reinforcing steel bar hoop (303).
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| CN114457833A (en) | 2022-05-10 |
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