CN115233719B - Large-area foundation reinforcement method and system - Google Patents
Large-area foundation reinforcement method and system Download PDFInfo
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- CN115233719B CN115233719B CN202210782887.9A CN202210782887A CN115233719B CN 115233719 B CN115233719 B CN 115233719B CN 202210782887 A CN202210782887 A CN 202210782887A CN 115233719 B CN115233719 B CN 115233719B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000002787 reinforcement Effects 0.000 title abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 229
- 239000010959 steel Substances 0.000 claims abstract description 229
- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 238000005520 cutting process Methods 0.000 claims abstract description 37
- 239000002689 soil Substances 0.000 claims abstract description 35
- 238000005553 drilling Methods 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 26
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 8
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims 1
- 238000011282 treatment Methods 0.000 abstract description 15
- 238000005452 bending Methods 0.000 description 8
- 239000002002 slurry Substances 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 5
- 239000011440 grout Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009527 percussion Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011369 optimal treatment Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000002435 tendon Anatomy 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
- E02D27/01—Flat foundations
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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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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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
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
-
- 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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
-
- 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
- E02D5/24—Prefabricated piles
- E02D5/32—Prefabricated piles with arrangements for setting or assisting in setting in position by fluid jets
Abstract
The invention discloses a large-area foundation reinforcement method and a large-area foundation reinforcement system, relates to the technical field of geotechnical engineering, solves the problem that the existing foundation treatment method is not suitable for urban foundation reinforcement, improves the safety of foundation reinforcement, and adopts the following specific scheme: drilling by using drilling equipment, distributing holes around the foundation to be treated, and allowing the bottoms of the holes to pass through the weak lower lying layer; inserting a prefabricated special-shaped steel pipe into the drilled hole; cutting soil between two adjacent special-shaped steel pipes by using a cutting mechanism; cleaning the cut gaps, and inserting a bent edge steel plate; after adjacent special-shaped steel pipes are connected into a ring through a bent edge steel plate in sequence, binding raft foundation steel bars, and welding the steel bars on the top bent edge of the steel plate; cleaning holes in the special-shaped steel pipes, and pouring the raft, the special-shaped steel pipes and the bent edge steel plates to form a closed whole; and carrying out high-pressure splitting grouting on the grouting holes reserved on the raft.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a large-area foundation reinforcing method and system.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In geotechnical engineering, when encountering a large-area deep soft foundation, the selection of a foundation treatment mode has key value and effect on construction projects. The inventors have found that it is necessary to select an appropriate foundation treatment method according to local conditions when performing foundation stabilization treatment in urban soft areas. For example, the foundation is limited by surrounding structures, underground pipelines and other environments, and is not suitable to be treated by adopting a tamping method such as dynamic compaction and the like; grouting reinforcement ensures good diffusion performance and stability of the slurry, and cannot be taken away by groundwater or run off along soil cracks, so that the slurry is difficult to control in practical engineering application.
When a foundation is designed for a large-scale structure, a raft foundation is often adopted under the conditions of larger building load and relatively weaker foundation bearing capacity. The foundation anti-sedimentation device has good integrity and can better resist uneven settlement of the foundation.
Therefore, in the case of a large-area soft foundation, there is a need for a method for reinforcing a large-area foundation, which combines foundation treatment with a foundation to achieve an optimal treatment effect.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a large-area foundation reinforcement method and a large-area foundation reinforcement system, and solves the problem that the existing foundation treatment method is not suitable for urban foundation reinforcement.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, the present invention provides a method for reinforcing a large-area foundation, which specifically comprises the following steps:
drilling by using drilling equipment, distributing holes around the foundation to be treated, and allowing the bottoms of the holes to pass through the weak lower lying layer;
inserting a prefabricated special-shaped steel pipe into the drilled hole;
cutting soil between two adjacent special-shaped steel pipes by using a cutting mechanism;
cleaning the cut gaps, and inserting a bent edge steel plate;
after adjacent special-shaped steel pipes are connected into a ring through a bent edge steel plate in sequence, binding raft foundation steel bars, and welding the steel bars on the top bent edge of the steel plate;
cleaning holes in the special-shaped steel pipes, and pouring the raft, the special-shaped steel pipes and the bent edge steel plates to form a closed whole;
and carrying out high-pressure splitting grouting on the grouting holes reserved on the raft.
As a further implementation mode, the high-pressure splitting grouting is performed after the integral casting construction of the raft, the special-shaped steel pipes and the bent edge steel plates is completed, and the grouting can be performed for multiple times in the later period.
As a further implementation manner, the special-shaped steel pipes inserted into the drill holes are required to be flush at the tops of all the special-shaped steel pipes, and the connection ports on the adjacent special-shaped steel pipes are aligned in pairs.
As a further implementation mode, the cutting mechanism cuts soil between adjacent special-shaped steel pipes along a straight line between two adjacent special-shaped steel pipe connectors.
As a further implementation mode, two ends of the bent edge steel plate are respectively inserted into the special-shaped steel pipes adjacent to the bent edge steel plate, and the insertion length is not less than 15cm.
As a further implementation mode, the upper part and the lower part of the top bent edge of the two opposite special-shaped steel pipes are connected through steel bars.
As a further implementation, the bent edge steel plate may be replaced with a diaphragm wall.
In a second aspect, the present invention provides a large-area foundation stabilization system comprising:
the retaining mechanism consists of a bent steel plate, a plurality of special-shaped steel pipes and a raft, wherein the special-shaped steel pipes are arranged at intervals around the foundation to be treated, two adjacent special-shaped steel pipes are connected through a bent steel plate, and the raft is fixedly arranged at the top of the bent steel plate;
the drilling mechanism is drilling equipment and is used for drilling the periphery of the foundation to be treated;
the cutting mechanism consists of a transmission assembly and a steel track, wherein the transmission assembly consists of a main transmission wheel and an auxiliary transmission wheel, the steel track is arranged around the main transmission wheel and the auxiliary transmission wheel, and a plurality of inverted teeth are arranged on the steel track;
the grouting mechanism is grouting equipment and is used for grouting special-shaped steel pipes and raft boards and high-pressure splitting grouting.
As a further implementation mode, the inside of special-shaped steel pipe is fixedly provided with the middle steel plate, both ends of the middle steel plate are fixedly connected with the inner wall of the special-shaped steel pipe, two connecting ports are formed in the side wall of the special-shaped steel pipe along the length direction of the side wall of the special-shaped steel pipe, and the two connecting ports are oppositely arranged on two sides of the middle steel plate.
As a further implementation mode, the bent edge steel plate is of a plate structure with three edges being bent except the bottom, the angle of the bent edge is 90 degrees, the top of the bent edge steel plate extends out of the special-shaped steel tube, and the extending length is the same as the thickness of the raft.
The beneficial effects of the invention are as follows:
(1) The invention has small excavation amount, effectively utilizes the current soil, avoids the waste caused by the replacement of the filling soil and reduces the cost of waste soil transportation; the special-shaped steel pipes, the bent edge steel plates and the raft plates are used for enclosing the periphery of the foundation to be treated to form a closed enclosing mechanism, so that the leakage problem of slurry in high-pressure splitting grouting is effectively reduced, the method is particularly suitable for soil bodies with larger permeability coefficients such as sandy soil, carbon emission is reduced, pollution to soil bodies around the reinforced foundation is reduced, and splitting grouting reinforcement is more effective.
(2) According to the invention, the bending treatment on the two sides of the bent steel plate greatly expands the contact area between the bent steel plate and concrete, and ensures the connection stability and connection strength of the bent steel plate and the special-shaped steel pipe after casting; and the bending treatment of the top of the bent steel plate enlarges the contact area between the bent steel plate and the raft steel bar and ensures the connection strength of the raft and the special-shaped steel sheet pile.
(3) The method for treating the large-area soft foundation can select the special-shaped steel pipe or the underground diaphragm wall according to the requirement of actual foundation bearing capacity, and greatly improves the application range of the method.
(4) The steel track of the cutting mechanism is provided with the inverted teeth, the inclined direction of the inverted teeth faces the rotating direction of the steel track, and when a soil layer is cut, the cut soil body can be directly carried out by the inverted teeth, so that manual soil digging is avoided, and the working efficiency is greatly improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic plan view of a large area foundation stabilization system according to one or more embodiments of the present invention;
FIG. 2 is a schematic structural view of a cutting mechanism according to one or more embodiments of the present disclosure;
FIG. 3 is a schematic view of a connection structure of a piping plate and raft tendons according to one or more embodiments of the present invention;
fig. 4 is a schematic top view of a profiled steel tube in accordance with one or more embodiments of the invention;
FIG. 5 is a schematic view of another type of cutting mechanism according to one or more embodiments of the present disclosure;
in the figure: the mutual spacing or size is exaggerated for showing the positions of all parts, and the schematic drawings are used only for illustration;
wherein, 1, a bent edge steel plate; 2. a special-shaped steel pipe; 3. concrete; 4. a transmission assembly; 5. a steel track; 6. an upper layer of reinforcing steel bars; 7. lower layer steel bars; 8. an intermediate steel plate; 9. a helical cutting head; 10. a support frame; 11. an engine; 12. and (5) balancing weights.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As described in the background art, in cities, foundations to be treated are limited by construction conditions such as surrounding and underground pipelines, and the like, and the surrounding and underground pipelines and the like are easily damaged by a dynamic compaction treatment method; the invention provides a large-area foundation reinforcement method and system, which aims to solve the technical problems that the large-scale replacement treatment depth is limited, post-construction settlement is easy to occur, and the existing foundation treatment method is not suitable for the reinforcement of urban foundations.
Example 1
In a typical embodiment of the present invention, a method for reinforcing a large-area foundation is provided, which comprises the following specific steps:
s1, foundation excavation and pile distribution
Geological detection is needed before foundation excavation and pile distribution are carried out, and a geological detection result and a site construction area provide data basis for subsequent foundation excavation and pile distribution parameter design;
after the design is completed, drilling is carried out by using drilling equipment according to the design requirement, holes are distributed around the foundation to be treated, and the bottoms of the holes penetrate through the weak lower lying layer.
The drill holes can be drilled by using a percussion drill, a rotary drill, a casing drill, a rotary drilling machine and other types of drills.
It will be appreciated that the type of drilling machine is selected based on the actual geological conditions of the construction site, for example, a relatively soft formation may be a percussion drill hole, a relatively hard formation or gravel layer, backfill, and the like, a rotary drill hole may be used, and the specific type of drilling machine is not limited in this regard.
S2, mounting of special-shaped steel pipes 2
After piling is completed, inserting prefabricated special-shaped steel pipes 2 into the drilled holes, so that the tops of all the special-shaped steel pipes 2 are level, and connecting ports on adjacent special-shaped steel pipes 2 are aligned pairwise;
the special-shaped steel pipe 2 is of a special steel pipe structure, an intermediate steel plate 8 is fixedly arranged in the special-shaped steel pipe 2, the length of the intermediate steel plate 8 is identical to that of the special-shaped steel pipe 2, two connecting ports are formed in the side wall of the special-shaped steel pipe 2 along the length direction of the special-shaped steel pipe, and the two connecting ports are respectively located on one side of the intermediate steel plate 8 and are used for connecting two adjacent special-shaped steel pipes 2.
S3, cutting treatment
And cutting soil between two adjacent special-shaped steel pipes 2 by using a cutting mechanism.
Specifically, the cutting mechanism comprises transmission assembly 4 and steel track 5 that has the pawl, can utilize the pawl to cut the soil body to dig out, in practical application, cutting mechanism carries out cutting treatment to the soil body between the adjacent special-shaped steel pipe 2 along the straight line between the connector of two adjacent special-shaped steel pipe 2 to connect through bent steel sheet 1 between the connector of follow-up two adjacent special-shaped steel pipe 2.
It will be appreciated that the depth of cut of the cutting mechanism is determined by the depth of insertion of the beaded steel plate 1, without being limited thereto.
S4, mounting of the bent edge steel plate 1
The steel plate 1 with bent edge is inserted into the gap cut by the cutting mechanism, the three sides of the steel plate 1 with bent edge except the bottom are bent, the bending angle is 90 degrees, the bent edge is not less than 5cm, the two ends of the steel plate 1 with bent edge are respectively inserted into the special-shaped steel pipes 2 adjacent to the steel plate with the inserted length not less than 15cm.
Specifically, the special-shaped steel pipe 2 is provided with a connecting port, which can be used for inserting the bent edge steel plate 2, in the inserting process, two ends of the bottom of the bent edge steel plate 2 are aligned with and inserted into the connecting ports on the adjacent special-shaped steel pipes 2 respectively, and the inserting length is not less than 15cm, namely, two adjacent special-shaped steel pipes 2 are connected through one bent edge steel plate 1.
The bending treatment on the two sides of the bent steel plate 1 greatly expands the contact area between the bent steel plate 1 and the concrete 3, and ensures the connection stability and the connection strength of the bent steel plate 1 and the special-shaped steel pipe 2 after the follow-up casting is completed.
S5, binding reinforcing steel bars
After the adjacent special-shaped steel pipes 2 are connected into a ring through the bent edge steel plates 1 in sequence (as shown in figure 1), binding of foundation raft steel bars is carried out, the steel bars are welded on the bent edge steel plates 1, reserved dowel bars connected with the top structure are manufactured, and a plurality of grouting holes are arranged at intervals.
It will be appreciated that the spacing between the grouting holes is determined according to actual design requirements and is not subject to excessive limitation.
Specifically, the upper parts of the top bent edges of the two oppositely arranged special-shaped steel pipes 2 are connected through the upper layer steel bars 6, the lower parts of the top bent edges of the two oppositely arranged special-shaped steel pipes 2 are connected through the lower layer steel bars 7, and after all special-shaped steel pipes 2 are connected through the steel bars, binding of foundation raft steel bars is completed.
The arrangement of the bent edge at the top of the special-shaped steel pipe 2 greatly enlarges the contact area with the steel bar and effectively improves the installation stability of the steel bar.
In other embodiments, when the requirement on the basic bearing capacity is higher, the special-shaped steel pipe 2 cannot meet the requirement at this time, and then the special-shaped steel pipe 2 can be replaced by an underground continuous wall, the underground continuous wall can be formed by using high-pressure jet grouting piles or concrete piles in a meshed manner, and the special-shaped steel pipe can be specifically selected according to the actual requirement without excessive limitation.
S6, casting reinforcement
The inside of the special-shaped steel pipe 2 is cleaned, and the foundation raft and the special-shaped steel pipe 2 are poured, so that the foundation raft, the special-shaped steel pipe 2 and the bent edge steel plate 1 are formed into a closed whole.
S7, foundation reinforcement
And high-pressure splitting grouting is carried out on the grouting holes reserved on the raft so as to strengthen the foundation to be treated.
Specifically, a high-pressure grouting mode is adopted, cement or chemical grout and other reinforcing grout are injected into a soil layer to improve the property of the soil layer, in the grouting process, the grout at the outlet of a grouting hole applies additional compressive stress to the surrounding stratum, so that a soil body is sheared, the grout is split along the crack from a place with low strength to a place with high strength, and the grout split into the soil body forms a network or skeleton for reinforcing the soil body.
The closed structure formed by the bent edge steel plate 1, the special-shaped steel pipes 2 and the raft board can limit soil in the closed structure, and the phenomenon of sinking caused by soil displacement in the high-pressure splitting slurry discharging process is avoided; meanwhile, the influence of slurry on the soil body on the periphery of the reinforced foundation during high-pressure splitting grouting is reduced, and the weight of the soil body outside the enclosure is converted into the lateral thrust of the enclosure by using the enclosure so as to offset the thrust of the slurry on the enclosure during high-pressure splitting grouting, so that the safety coefficient of the enclosure is greatly improved.
It should be noted that the high-pressure split grouting needs to be performed after the construction of the upper structure (the structure formed after the integral casting of the raft, the special-shaped steel pipe and the bent edge steel plate is completed) is completed, so that the high-pressure split grouting is suitable for higher pressure and the bulge of the raft is avoided.
Multiple high-pressure split grouting can be performed in the later stage so as to control sedimentation within a very small range.
Example 2
In another exemplary embodiment of the present invention, as shown in fig. 1-5, a system for reinforcing a large-area foundation is provided, which comprises a containment mechanism, wherein the containment mechanism is composed of a bent steel plate 1 and a plurality of special-shaped steel pipes 2, the special-shaped steel pipes 2 are arranged around the foundation to be treated according to a set interval, and two adjacent special-shaped steel pipes 2 are connected through a bent steel plate 1.
The enclosure mechanism further comprises a raft, wherein steel bars of the raft are fixedly arranged on the bent edge steel plate 1 in a welding mode so as to realize the fixed connection of the raft and the special-shaped steel sheet pile, and grouting holes are reserved in the raft and used for high-pressure split grouting of a subsequent foundation.
Specifically, the special-shaped steel pipe 2 is of a special-shaped steel pipe structure, an intermediate steel plate 8 is fixedly arranged in the special-shaped steel pipe 2, two ends of the intermediate steel plate 8 are fixedly connected with the inner wall of the special-shaped steel pipe 2, the length of the intermediate steel plate 8 is the same as that of the special-shaped steel pipe 2, two connecting ports are formed in the side wall of the special-shaped steel pipe 2 along the length direction of the side wall, and the two connecting ports are oppositely arranged on two sides of the intermediate steel plate 8 and are used for connecting two adjacent special-shaped steel pipes 2.
The arrangement of the middle steel plate 8 ensures that the special-shaped steel pipe 2 can be integrally formed, and reduces the use complexity of the special-shaped steel pipe 2.
The bent edge steel plate 1 is a plate structure with three edges except the bottom being bent, the angle of the bent edge is 90 degrees, the top of the bent edge steel plate 1 extends out of the special-shaped steel tube 2, the extending length is the same as the thickness of the raft, the length of the bent edge steel plate 1 is determined according to the distance between two adjacent special-shaped steel tubes 2, and the two ends of the bent edge steel plate 1 can be inserted into the special-shaped steel tubes 2 adjacent to the bent edge steel plate to be not less than 15cm.
The bending steel plate 1 and the special-shaped steel pipe 2 are fixedly connected through concrete 3, and specifically, after the bending steel plate 1 is inserted into the special-shaped steel pipe 2, the bending steel plate 1 and the special-shaped steel pipe 2 are fixedly connected through casting concrete 3.
The bending treatment on the two sides of the bent steel plate 1 greatly expands the contact area between the bent steel plate 1 and the concrete 3, and ensures the connection stability and the connection strength of the bent steel plate 1 and the special-shaped steel pipe 2 after the follow-up casting is completed.
It will be appreciated that the strength designation of the concrete 3 is selected according to design requirements and is not intended to be limiting in any way.
The drilling machine is provided with a drilling mechanism for drilling the periphery of the foundation to be treated so as to realize the installation of the special-shaped steel pipe 2, wherein the drilling mechanism is existing drilling machine equipment, and the specific type is selected according to the actual geological condition.
The cutting mechanism is further provided, and consists of a transmission assembly 4 and a steel caterpillar band 5, wherein the transmission assembly 4 consists of a main transmission wheel and an auxiliary transmission wheel, and the steel caterpillar band 5 is arranged around the main transmission wheel and the auxiliary transmission wheel, so that the main transmission wheel and the auxiliary transmission wheel are connected through the steel caterpillar band 5.
The main driving wheel and the auxiliary driving wheel are also connected through an adjusting shaft, the length of the adjusting shaft can be adjusted according to the requirement, so that the distance between the main driving wheel and the auxiliary driving wheel is adjusted, the tension of the steel caterpillar band 5 is further ensured, and the main driving wheel is connected with driving equipment to drive the steel caterpillar band 5 to rotate.
Be equipped with a plurality of back teeth on the steel track 5, the inclination of back teeth is towards the direction of rotation of steel track 5, when cutting the soil layer, can utilize the back teeth directly to take out the soil body of cutting, avoided artifical soil excavation, improved work efficiency greatly.
In other embodiments, the cutting mechanism may also be a spiral soil cutting structure, and as shown in fig. 5, the cutting mechanism is composed of a spiral cutting head 9, a transmission mechanism, a supporting frame 10, a motor 11 and a balancing weight 12.
The motor 11 is fixedly arranged on the upper portion of the supporting frame 10, the spiral cutting head 9 is transversely arranged at the bottom of the supporting frame 10, the spiral cutting head 9 is rotationally connected with the supporting frame 10, and the motor 11 is in transmission connection with the spiral cutting head 9 through a transmission mechanism.
The transmission mechanism may be a belt or the like as long as the power of the engine 11 can be transmitted to the screw head 9, and is not limited in this regard.
The spiral cutting head 9 is transversely arranged, so that soil between two special-shaped steel pipes 2 can be quickly cut off, the cutting speed of the soil is greatly improved, and the construction efficiency is improved.
The balancing weight 12 is fixedly arranged below the engine 11, the downward pressure of the cutting mechanism can be increased due to the arrangement of the balancing weight 12, and the spiral cutting head 9 can be ensured to be in contact with soil effectively, so that the soil cutting efficiency is ensured.
The grouting device is also provided with a grouting mechanism, and the grouting mechanism is existing grouting equipment and is used for grouting in the special-shaped steel pipe 2 and the raft and high-pressure splitting grouting work of the subsequent foundation.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A large-area foundation strengthening method is characterized by comprising the following specific steps:
drilling by using drilling equipment, distributing holes around the foundation to be treated, and allowing the bottoms of the holes to pass through the weak lower lying layer;
inserting a prefabricated special-shaped steel pipe into the drilled hole;
cutting soil between two adjacent special-shaped steel pipes by using a cutting mechanism;
cleaning the cut gaps, and inserting a bent edge steel plate;
after adjacent special-shaped steel pipes are connected into a ring through a bent edge steel plate in sequence, binding raft foundation steel bars, and welding the steel bars on the top bent edge of the steel plate;
cleaning holes in the special-shaped steel pipes, and pouring the raft, the special-shaped steel pipes and the bent edge steel plates to form a closed whole;
performing high-pressure splitting grouting on grouting holes reserved on the raft;
the inside of the special-shaped steel pipe is fixedly provided with a middle steel plate, two ends of the middle steel plate are fixedly connected with the inner wall of the special-shaped steel pipe, two connecting ports are formed in the side wall of the special-shaped steel pipe along the length direction of the side wall of the special-shaped steel pipe, and the two connecting ports are oppositely arranged on two sides of the middle steel plate;
the bent edge steel plate is of a plate structure with three edges except the bottom being bent, the angle of the bent edge is 90 degrees, the top of the bent edge steel plate extends out of the special-shaped steel tube, and the extending length is the same as the thickness of the raft.
2. The method for reinforcing a large-area foundation according to claim 1, wherein the high-pressure split grouting is performed after the integral casting construction of the raft, the special-shaped steel pipes and the bent edge steel plates is completed, and the grouting can be performed for a plurality of times in the later stage.
3. The method of claim 1, wherein the profiled steel tubes inserted into the borehole are aligned such that the tops of all profiled steel tubes are flush, and the connection ports on adjacent profiled steel tubes are aligned in pairs.
4. The method for reinforcing a large-area foundation according to claim 1, wherein the cutting mechanism cuts soil between adjacent profiled steel pipes along a straight line between the connection ports of the adjacent profiled steel pipes.
5. The method of claim 1, wherein the two ends of the bent steel plate are respectively inserted into the profiled steel pipes adjacent thereto, and the insertion length is not less than 15cm.
6. The method of claim 1, wherein the upper and lower portions of the top flanges of the two adjacent profiled steel pipes are connected by reinforcing bars.
7. A large area foundation stabilization system for implementing the stabilization method of any one of claims 1 to 6, comprising:
the device comprises a retaining mechanism, a plurality of first retaining mechanisms and a second retaining mechanisms, wherein the retaining mechanism consists of a bent steel plate, special-shaped steel pipes and raft plates, the special-shaped steel pipes are arranged in a plurality of mode, the special-shaped steel pipes are arranged around a foundation to be treated at intervals, two adjacent special-shaped steel pipes are connected through the bent steel plate, and the raft plates are fixedly arranged at the top of the bent steel plate;
the drilling mechanism is drilling equipment and is used for drilling the periphery of the foundation to be treated;
the cutting mechanism consists of a transmission assembly and a steel track, wherein the transmission assembly consists of a main transmission wheel and an auxiliary transmission wheel, the steel track is arranged around the main transmission wheel and the auxiliary transmission wheel, and a plurality of inverted teeth are arranged on the steel track;
the grouting mechanism is grouting equipment and is used for grouting special-shaped steel pipes and raft boards and high-pressure splitting grouting.
Priority Applications (1)
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|---|---|---|---|---|
| CN2853905Y (en) * | 2005-07-06 | 2007-01-03 | 唐业清 | Foundation structure of anti-sink foundation |
| KR20100068597A (en) * | 2008-12-15 | 2010-06-24 | 유진지오 주식회사 | A shoring method using arch plate pile and h-pile |
| CN103388341A (en) * | 2013-07-29 | 2013-11-13 | 江苏翔森建设工程有限公司 | Large-sized piled raft foundation structure and construction method |
| CN103526770A (en) * | 2013-10-16 | 2014-01-22 | 鸿鑫建设集团有限公司 | High-impermeable anti-floating pile raft structure and construction method |
| CN216405528U (en) * | 2021-10-22 | 2022-04-29 | 陕西水利水电工程集团有限公司 | Soil slope cutting device |
| CN216515701U (en) * | 2021-12-13 | 2022-05-13 | 华蓝设计（集团）有限公司 | Miniature stake raft board combination foundation structure |
-
2022
- 2022-07-05 CN CN202210782887.9A patent/CN115233719B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2853905Y (en) * | 2005-07-06 | 2007-01-03 | 唐业清 | Foundation structure of anti-sink foundation |
| KR20100068597A (en) * | 2008-12-15 | 2010-06-24 | 유진지오 주식회사 | A shoring method using arch plate pile and h-pile |
| CN103388341A (en) * | 2013-07-29 | 2013-11-13 | 江苏翔森建设工程有限公司 | Large-sized piled raft foundation structure and construction method |
| CN103526770A (en) * | 2013-10-16 | 2014-01-22 | 鸿鑫建设集团有限公司 | High-impermeable anti-floating pile raft structure and construction method |
| CN216405528U (en) * | 2021-10-22 | 2022-04-29 | 陕西水利水电工程集团有限公司 | Soil slope cutting device |
| CN216515701U (en) * | 2021-12-13 | 2022-05-13 | 华蓝设计（集团）有限公司 | Miniature stake raft board combination foundation structure |
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| CN115233719A (en) | 2022-10-25 |
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