CN115233719A - Large-area foundation reinforcement method and reinforcement system - Google Patents
Large-area foundation reinforcement method and reinforcement system Download PDFInfo
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- CN115233719A CN115233719A CN202210782887.9A CN202210782887A CN115233719A CN 115233719 A CN115233719 A CN 115233719A CN 202210782887 A CN202210782887 A CN 202210782887A CN 115233719 A CN115233719 A CN 115233719A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000002787 reinforcement Effects 0.000 title claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 222
- 239000010959 steel Substances 0.000 claims abstract description 222
- 238000005520 cutting process Methods 0.000 claims abstract description 38
- 230000007246 mechanism Effects 0.000 claims abstract description 38
- 239000002689 soil Substances 0.000 claims abstract description 33
- 238000005553 drilling Methods 0.000 claims abstract description 24
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 13
- 230000006641 stabilisation Effects 0.000 claims abstract description 9
- 238000011105 stabilization Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 28
- 230000003014 reinforcing effect Effects 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000011282 treatment Methods 0.000 abstract description 13
- 238000005452 bending Methods 0.000 description 10
- 239000011440 grout Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 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
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002002 slurry 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
- 230000033228 biological regulation Effects 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- 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
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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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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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
- E02D5/24—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 stabilization method and a large-area foundation stabilization system, relates to the technical field of geotechnical engineering, solves the problem that the existing foundation treatment method is not suitable for urban foundation stabilization, improves the safety of foundation stabilization, and adopts the following specific scheme: drilling by using drilling equipment, distributing holes around the foundation to be treated, and enabling the hole bottom to penetrate through the weak subnatal layer; inserting a prefabricated special-shaped steel pipe into the drill hole; cutting the soil body between two adjacent special-shaped steel pipes by using a cutting mechanism; cleaning the cut gap, and inserting a bent steel plate; binding reinforcing steel bars of the raft foundation after adjacent special-shaped steel pipes are connected into a ring sequentially through the bent edge steel plates, and welding the reinforcing steel bars on the bent edges of the tops of the steel plates; cleaning the inner part of the special-shaped steel pipe, and pouring the raft plate, the special-shaped steel pipe and the bent edge steel plate to form a closed whole; and (4) performing high-pressure splitting grouting on grouting holes reserved on the raft plates.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a large-area foundation reinforcement method and a reinforcement 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 large-area deep and soft foundations are encountered, the selection of a foundation treatment mode has key value and effect on construction projects. The inventor finds that when the foundation reinforcement treatment is carried out on the soft city area, an appropriate foundation treatment method needs to be selected according to local conditions. For example, the foundation is limited by the surrounding structures, underground pipelines and other environments, and is not suitable to be treated by adopting tamping methods such as dynamic compaction and the like; the grouting reinforcement is difficult to control in practical engineering application because the good diffusion performance and the stability of the grout are ensured, and the grout cannot be taken away by underground water or run off along soil body cracks.
When foundation design is carried out on a large structure, raft foundations are often adopted for the conditions that building loads are large and foundation bearing capacity is relatively weak. The integrated foundation has good integrity and can better resist the uneven settlement of the foundation.
Therefore, when aiming at large-area soft foundation, a method for reinforcing the large-area foundation is urgently needed, and foundation treatment and foundation are combined to play a role together so as to achieve the optimal treatment effect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a large-area foundation reinforcement method and a reinforcement system, and solves the problem that the existing foundation treatment method is not suitable for urban foundation reinforcement.
In order to realize the purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a method for reinforcing a large-area foundation, which comprises the following specific processes:
drilling by using drilling equipment, distributing holes around the foundation to be treated, and enabling the hole bottom to penetrate through the weak subjacent layer;
inserting a prefabricated special-shaped steel pipe into the drill hole;
cutting the soil body between two adjacent special-shaped steel pipes by using a cutting mechanism;
cleaning the cut gap, and inserting a bent steel plate;
binding reinforcing steel bars of the raft foundation after adjacent special-shaped steel pipes are connected into a ring through the bent edge steel plates in sequence, and welding the reinforcing steel bars on the bent edges of the tops of the steel plates;
cleaning holes in the special-shaped steel pipes, and pouring the raft plate, the special-shaped steel pipes and the bent edge steel plates to form a closed whole body by the raft plate, the special-shaped steel pipes and the bent edge steel plates;
and (4) performing high-pressure splitting grouting on grouting holes reserved on the raft plates.
As a further implementation mode, the high-pressure splitting grouting is carried out after the integral casting construction of the raft, the special-shaped steel pipe and the bent edge steel plate is completed, and multiple times of grouting can be carried out in the later stage.
As a further implementation manner, the special-shaped steel pipes inserted into the drill holes need to have the tops of all the special-shaped steel pipes flush, and every two connectors on the adjacent special-shaped steel pipes are aligned.
As a further implementation mode, the cutting mechanism carries out cutting treatment on the soil body between the adjacent special-shaped steel pipes along a straight line between the connecting ports of the two adjacent special-shaped steel pipes.
As a further implementation mode, two ends of the flanging steel plate are respectively inserted into the special-shaped steel pipes adjacent to the flanging steel plate, and the insertion length is not less than 15cm.
As a further implementation manner, the upper parts and the lower parts of the top bent edges of the two oppositely arranged special-shaped steel pipes are connected through reinforcing steel bars.
As a further implementation mode, the edge bending steel plate can be replaced by an underground continuous wall.
In a second aspect, the present invention provides a large area foundation stabilization system, including:
the enclosing mechanism is composed of a plurality of bent edge steel plates, special-shaped steel pipes and a raft plate, the special-shaped steel pipes are arranged around the foundation to be treated at intervals, two adjacent special-shaped steel pipes are connected through one bent steel plate, and the raft plate is fixedly arranged at the top of the bent edge steel plates;
the drilling mechanism is drilling machine 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 crawler, the transmission assembly consists of a main transmission wheel and an auxiliary transmission wheel, the steel crawler is arranged around the main transmission wheel and the auxiliary transmission wheel, and a plurality of inverted teeth are arranged on the steel crawler;
the grouting mechanism is grouting equipment and is used for grouting of special-shaped steel pipes and raft plates and high-pressure splitting grouting.
As a further implementation manner, a middle steel plate is fixedly arranged inside the special-shaped steel pipe, two ends of the middle steel plate are fixedly connected with the inner wall of the special-shaped steel pipe, two connectors are arranged on the side wall of the special-shaped steel pipe along the length direction of the special-shaped steel pipe, and the two connectors are oppositely arranged on two sides of the middle steel plate.
As further implementation, the crimp steel plate is the plate structure of all other trilateral processing of all buckling except the bottom, and the angle of buckling the limit is 90, and special-shaped steel pipe is stretched out at the top of crimp steel plate, and the length of stretching out is the same with the raft plate thickness.
The beneficial effects of the invention are as follows:
(1) The invention has small excavation amount, effectively utilizes the current soil, avoids waste caused by changing and filling earthwork and reduces the expense of spoil transportation; the special-shaped steel pipe, the flanging steel plate and the raft are used for enclosing around the foundation to be treated to form the closed enclosure mechanism, so that the leakage problem of slurry during high-pressure fracturing grouting is effectively reduced, the special-shaped steel pipe and the raft are particularly suitable for soil bodies with large permeability coefficients such as sandy soil, carbon emission is reduced, pollution to soil bodies around the reinforced foundation is reduced, and the fracturing grouting reinforcement is more effective.
(2) The invention greatly enlarges the contact area between the steel plate and the concrete, and ensures the connection stability and the connection strength between the bent steel plate and the special-shaped steel pipe after casting; the crimp treatment at the top of the crimp steel plate enlarges the contact area between the crimp steel plate and the reinforcing steel bars of the raft plate, and ensures the connection strength between the raft plate and the special-shaped steel sheet pile.
(3) The method for treating the large-area soft foundation can select and use the special-shaped steel pipe or the underground continuous wall according to the requirement of the 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 soil layers are cut, the cut soil bodies can be directly taken 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 incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit 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 diagram 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 flanged steel plate and raft reinforcing steel bars according to one or more embodiments of the present invention;
FIG. 4 is a schematic top view of a profiled steel pipe according to one or more embodiments of the present invention;
FIG. 5 is a schematic diagram 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 to show the position of each part, and the schematic diagram is only used for illustration;
1, bending a steel plate; 2. a special-shaped steel pipe; 3. concrete; 4. a transmission assembly; 5. a steel track; 6. upper layer steel bars; 7. lower layer steel bar; 8. an intermediate steel plate; 9. a spiral cutting head; 10. a support frame; 11. an engine; 12. and a balancing weight.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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 a city, the foundation to be treated is limited by construction conditions such as peripheral and underground pipelines, and the peripheral and underground pipelines are easily damaged by the dynamic compaction treatment method; the invention provides a large-area foundation reinforcing method and a large-area foundation reinforcing system, aiming at solving the technical problems that the large-scale replacement and filling treatment is limited in depth and easy to generate post-construction settlement, so that the existing foundation treatment method is not suitable for reinforcing 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, excavating foundation and arranging piles
Geological detection is required before foundation excavation and pile arrangement, and a geological detection result and a field construction area provide data basis for parameter design of subsequent foundation excavation and pile arrangement;
after the design is finished, drilling holes by using drilling equipment according to design requirements, distributing the holes around the foundation to be treated, and enabling the hole bottom to penetrate through the weak subnatal layer.
The drill hole can be drilled by using a percussion drill, a rotary drill, a sleeve drill, a rotary drilling rig and other types of drilling rigs.
It can be understood that the type of the drilling machine is selected according to the actual geological conditions of the construction site, for example, the softer stratum is formed by using an impact drilling machine, the harder stratum or a gravel layer, backfill soil and other more complicated geological conditions are formed by using a rotary drilling machine, and the like, and the specific type of the drilling machine is not limited too much here.
S2, mounting of special-shaped steel pipe 2
After piling is finished, inserting the prefabricated special-shaped steel pipes 2 into the drill holes, so that the tops of all the special-shaped steel pipes 2 are flush, and connecting ports on the adjacent special-shaped steel pipes 2 are aligned pairwise;
the special-shaped steel pipe 2 is of a specially-made steel pipe structure, the middle steel plate 8 is fixedly arranged inside the special-shaped steel pipe 2, the length of the middle steel plate 8 is the same as that of the special-shaped steel pipe 2, two connectors are arranged on the side wall of the special-shaped steel pipe 2 along the length direction of the special-shaped steel pipe, and the two connectors are respectively located on one side of the middle steel plate 8 and used for connecting two adjacent special-shaped steel pipes 2.
S3, cutting treatment
And (3) cutting the soil body between the two adjacent special-shaped steel pipes 2 by using a cutting mechanism.
Specifically, the cutting mechanism consists of a transmission assembly 4 and a steel crawler belt 5 with inverted teeth, soil bodies can be cut and excavated by the inverted teeth, and in practical application, the cutting mechanism performs cutting treatment on the soil bodies between the adjacent special-shaped steel pipes 2 along a straight line between the connectors of the two adjacent special-shaped steel pipes 2, so that the connectors of the two adjacent special-shaped steel pipes 2 are connected through the bent edge steel plate 1.
It is understood that the cutting depth of the cutting means is determined according to the insertion depth of the bent steel plate 1, and is not limited thereto.
S4, mounting of the edge bending steel plate 1
Inserting a bent steel plate 1 into a gap cut by the cutting mechanism, bending the rest three sides of the bent steel plate 1 except the bottom, wherein the bending angle is 90 degrees, the bending angle is not less than 5cm, respectively inserting two ends of the bent steel plate 1 into the special-shaped steel pipes 2 adjacent to the bent steel plate, and the inserting length is not less than 15cm.
Specifically, the special-shaped steel pipes 2 are provided with connectors which can be used for inserting the bent steel plates 2, in the inserting process, the two ends of the bottoms of the bent steel plates 2 are respectively aligned with and inserted into the connectors on the adjacent special-shaped steel pipes 2, the inserting length is not less than 15cm, namely, the two adjacent special-shaped steel pipes 2 are connected through the bent steel plate 1.
The bending processing of the two sides of the bending steel plate 1 greatly enlarges the contact area of the bending steel plate 1 and the concrete 3, and ensures the connection stability and the connection strength of the bending steel plate 1 and the special-shaped steel pipe 2 after the subsequent casting is finished.
S5, binding steel bars
After 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 reinforcing steel bars of the basic raft, welding the reinforcing steel bars on the bent edge steel plates 1, making reserved joint bars connected with the top structure, and arranging a plurality of grouting holes at intervals.
It will be appreciated that the spacing between the grout holes is determined according to the actual design requirements and is not overly limited herein.
Specifically, the upper portion of the top crimp of the two opposite arranged special-shaped steel pipes 2 is connected through the upper layer steel bars 6, the lower portion of the top crimp of the two opposite arranged special-shaped steel pipes 2 is connected through the lower layer steel bars 7, and after all the special-shaped steel pipes 2 are connected through the steel bars, binding of the basic raft plate 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 reinforcing steel bar, and effectively improves the installation stability of the reinforcing steel bar.
In other embodiments, when the requirement on the bearing capacity of the foundation is higher, the special-shaped steel pipes 2 cannot meet the requirement at the moment, the special-shaped steel pipes 2 can be replaced by underground continuous walls, the underground continuous walls can be formed by meshing high-pressure jet grouting piles or concrete piles, the special-shaped steel pipes can be selected according to actual requirements, and excessive limitation is not performed.
S6, casting reinforcement
And cleaning the inner part of the special-shaped steel pipe 2, and pouring the foundation raft and the special-shaped steel pipe 2 to enable the foundation raft, the special-shaped steel pipe 2 and the bent steel plate 1 to be a closed whole.
S7, reinforcing the foundation
And (4) performing high-pressure splitting grouting on grouting holes reserved on the raft plates to reinforce the foundation to be treated.
In the grouting process, additional pressure stress is applied to the surrounding stratum by the grout at the outlet of a grouting hole, so that a soil body is sheared and cracked, the grout splits from a place with low soil body strength to a place with high strength along the crack, and the grout splitting into the soil body forms a network or a framework for reinforcing the soil body.
The closed structure formed by enclosing the curved steel plate 1, the special-shaped steel pipe 2 and the raft can limit the soil in the closed structure, so that the phenomenon of sinking caused by displacement of the soil in the high-pressure splitting slurry discharging process is avoided; meanwhile, the influence of the grout on the soil body on the periphery of the reinforced foundation during high-pressure splitting grouting is reduced, and the enclosing mechanism is used for converting the weight of the soil body outside the enclosing mechanism into the lateral thrust on the enclosing mechanism so as to offset the thrust of the grout on the enclosing mechanism during high-pressure splitting grouting, so that the safety coefficient of the enclosing mechanism is greatly improved.
It should be noted that the high-pressure splitting grouting needs to be performed after the upper structure (the structure formed after the raft, the special-shaped steel pipe and the bent steel plate are integrally cast) is constructed, so that the high-pressure splitting grouting method is suitable for higher pressure and avoids uplift of the raft.
And high-pressure splitting grouting can be carried out for multiple times in the later period so as to control the settlement within a minimum range.
Example 2
In another exemplary embodiment of the present invention, as shown in fig. 1 to 5, a large area foundation reinforcing system is provided, which includes an enclosure mechanism, the enclosure mechanism is composed of a steel plate 1 and a plurality of special-shaped steel pipes 2, the plurality of special-shaped steel pipes 2 are arranged around the foundation to be treated according to a set distance, and two adjacent special-shaped steel pipes 2 are connected through a bent steel plate 1.
The enclosure mechanism further comprises a raft plate, steel bars of the raft plate are fixedly arranged on the bent steel plate 1 in a welding mode so as to realize the fixed connection of the raft plate and the special-shaped steel sheet pile, and grouting holes are reserved in the raft plate and used for high-pressure splitting grouting of a subsequent foundation.
Specifically, the special-shaped steel pipe 2 is a specially-made steel pipe structure, the middle steel plate 8 is fixedly arranged inside the special-shaped steel pipe 2, two ends of the middle steel plate 8 are fixedly connected with the inner wall of the special-shaped steel pipe 2, the length of the middle steel plate 8 is the same as that of the special-shaped steel pipe 2, two connectors are arranged on the side wall of the special-shaped steel pipe 2 along the length direction of the side wall, and the two connectors are oppositely arranged on two sides of the middle steel plate 8 and 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 plate structure that the bent steel plate 1 was all buckled except that the bottom other trilateral and handled, the angle of buckling the limit is 90, and special-shaped steel pipe 2 is stretched out at the top of bent steel plate 1, and the length that stretches out is the same with the raft thickness, and the length of the steel plate 1 of buckling is confirmed according to the distance between two adjacent special-shaped steel pipe 2, as long as can guarantee with the both ends of bent steel plate 1 insert rather than the length in the adjacent special-shaped steel pipe 2 be not less than 15cm can.
Realize fixed connection through concrete 3 between the steel sheet 1 of buckling and the shaped steel pipe 2, it is concrete, after the steel sheet 1 of buckling inserts the shaped steel pipe 2, will buckle steel sheet 1 and carry out fixed connection with the shaped steel pipe 2 through casting concrete 3.
The contact area between the bent steel plate 1 and the concrete 3 is greatly enlarged by the bent processing on the two sides of the bent steel plate 1, and the connection stability and the connection strength of the bent steel plate 1 and the special-shaped steel pipe 2 are ensured after the subsequent casting is finished.
It will be appreciated that the strength designation of the concrete 3 is selected according to design requirements and is not overly restrictive.
The special-shaped steel pipe 2 is provided with a drilling mechanism for drilling holes on the periphery of a foundation to be treated so as to realize the installation of the special-shaped steel pipe, wherein the drilling mechanism is the existing drilling machine equipment, and the specific type is selected according to the actual geological condition.
The cutting mechanism is further arranged and comprises a transmission assembly 4 and a steel caterpillar 5, wherein the transmission assembly 4 comprises a main transmission wheel and an auxiliary transmission wheel, and the steel caterpillar 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 5.
Still be connected through the regulating spindle between final drive wheel and the accessory drive wheel, the regulating spindle can carry out the regulation of length according to the demand to adjust the interval between final drive wheel and the accessory drive wheel, and then guarantee steel track 5's rate of tension, the final drive wheel is connected with transmission equipment, drives steel track 5 and realizes rotating.
Be equipped with a plurality of pawl on the steel track 5, the incline direction of pawl is towards the direction of rotation of steel track 5, when cutting the soil layer, can utilize the pawl directly to take out the soil body of cutting, has avoided the manual work to draw out soil, has improved work efficiency greatly.
In other embodiments, the cutting mechanism may also be a spiral soil cutting structure, as shown in fig. 5, and is composed of a spiral cutting head 9, a transmission mechanism, a support frame 10, an engine 11, and a counterweight 12.
Wherein, the engine 11 is fixedly arranged on the upper part of the support frame 10, the spiral cutting head 9 is transversely arranged at the bottom of the support frame 10, the spiral cutting head 9 is rotatably connected with the support frame 10, and the engine 11 is in transmission connection with the spiral cutting head 9 through a transmission mechanism.
The transmission mechanism may be a transmission belt or the like, as long as the power of the engine 11 can be transmitted to the helical cutting head 9, without any limitation.
The spiral cutting head 9 transversely sets up, can be quick with the excision of the soil between two special-shaped steel pipes 2, improved the excision speed of soil greatly, improved the efficiency of construction.
The fixed balancing weight 12 that is equipped with in below of engine 11, the setting of balancing weight 12 can increase the decurrent pressure of cutting mechanism, guarantees that spiral cutting head 9 can be effectual and soil contact to guarantee the efficiency of soil cutting.
The grouting mechanism is an existing grouting device and is used for grouting of the inside of the special-shaped steel pipe 2 and the raft and subsequent high-pressure split grouting of the foundation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A large-area foundation reinforcement method is characterized by comprising the following specific processes:
drilling by using drilling equipment, distributing holes around the foundation to be treated, and enabling the hole bottom to penetrate through the weak subnatal layer;
inserting a prefabricated special-shaped steel pipe into the drill hole;
cutting the soil body between two adjacent special-shaped steel pipes by using a cutting mechanism;
cleaning the cut gap, and inserting the bent steel plate;
binding reinforcing steel bars of the raft foundation after adjacent special-shaped steel pipes are connected into a ring sequentially through the bent edge steel plates, and welding the reinforcing steel bars on the bent edges of the tops of the steel plates;
cleaning the inner part of the special-shaped steel pipe, and pouring the raft plate, the special-shaped steel pipe and the bent edge steel plate to form a closed whole;
and (4) performing high-pressure splitting grouting on grouting holes reserved on the raft plates.
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 pipe and the flanged steel plate is completed, and multiple times of grouting can be performed in the later period.
3. The method for reinforcing the large-area foundation according to claim 1, wherein the deformed steel pipes inserted into the drilled holes are required to be flush with the tops of all the deformed steel pipes, and the connecting ports on the adjacent deformed steel pipes are aligned in pairs.
4. The method for reinforcing the large-area foundation according to claim 1, wherein the cutting mechanism cuts the soil body between the adjacent special-shaped steel pipes along the straight line between the connecting ports of the two adjacent special-shaped steel pipes.
5. A large-area foundation reinforcing method according to claim 1, wherein both ends of said bent steel plate are inserted into the deformed steel pipes adjacent thereto, respectively, with an insertion length of not less than 15cm.
6. A method for reinforcing a large area foundation according to claim 1, wherein the upper and lower portions of the top flanges of the two opposite deformed steel pipes are connected by reinforcing bars.
7. A method for reinforcing a large area foundation according to claim 1, wherein the bent steel plate is replaced with a diaphragm wall.
8. A large area foundation stabilization system, comprising:
the enclosure mechanism is composed of a plurality of bent edge steel plates, special-shaped steel pipes and a raft plate, the special-shaped steel pipes are arranged on the periphery of the foundation to be treated at intervals, two adjacent special-shaped steel pipes are connected through a bent steel plate, and the raft plate is fixedly arranged at the top of the bent edge steel plates;
the drilling mechanism is drilling machine 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 crawler belt, the transmission assembly consists of a main transmission wheel and an auxiliary transmission wheel, the steel crawler belt is arranged around the main transmission wheel and the auxiliary transmission wheel, and a plurality of inverted teeth are arranged on the steel crawler belt;
the grouting mechanism is grouting equipment and is used for grouting of special-shaped steel pipes and raft plates and high-pressure splitting grouting.
9. The large-area foundation stabilization system according to claim 8, wherein an intermediate steel plate is fixedly arranged inside the special-shaped steel pipe, both ends of the intermediate steel plate are fixedly connected with the inner wall of the special-shaped steel pipe, two connectors are arranged on the side wall of the special-shaped steel pipe along the length direction of the special-shaped steel pipe, and the two connectors are oppositely arranged on both sides of the intermediate steel plate.
10. The large area foundation stabilization system according to claim 8, wherein the bent steel plate is a plate structure with three bent sides except the bottom, the angle of the bent side is 90 °, the top of the bent steel plate extends out of the steel tube with the same length as the thickness of the raft plate.
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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 |
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2022
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| 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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| CN115233719B (en) | 2023-11-24 |
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