CN114837455A - Reconstruction method of subsided hydraulic structure - Google Patents
Reconstruction method of subsided hydraulic structure Download PDFInfo
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- CN114837455A CN114837455A CN202210649859.XA CN202210649859A CN114837455A CN 114837455 A CN114837455 A CN 114837455A CN 202210649859 A CN202210649859 A CN 202210649859A CN 114837455 A CN114837455 A CN 114837455A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/06—Separating, lifting, removing of buildings; Making a new sub-structure
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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
- E02D15/06—Placing concrete under water
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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
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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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
- E02D27/32—Foundations for special purposes
- E02D27/48—Foundations inserted underneath existing buildings or constructions
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Abstract
The invention provides a method for rebuilding a sunken hydraulic structure, which comprises the following steps: step 1, underwater exploration; 2. treating a field; step 3, building a construction platform; step 4, designing a pile foundation scheme; step 5, implementing pile foundation construction according to the pile foundation scheme provided in the step 4; the pile foundation penetrates through the sunk building and is integrated with the sunk building; the pile foundation comprises a first stage pile foundation and a second stage pile foundation; step 6, forming a foundation surface: cleaning the top of the sunk building, leveling the underwater self-leveling concrete to form a plane, and establishing a foundation plane on the top of the sunk building by combining a pile foundation and an upper load; the whole process of the invention avoids the key steps of the traditional methods such as large-scale cofferdam construction, deep foundation pit construction, demolition and the like, changes the sunk building into a favorable foundation, realizes breakthrough and overcomes the defects of the common traditional scheme.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a reconstruction method of a sunken hydraulic structure.
Background
The foundation reinforcement is needed to ensure the safety and the usability of the project due to the defects of the foundation of the building, and the original building needs to be dismantled for reconstruction under severe conditions. The foundation defects are more, the foundation is collapsible and expansive, the original building foundation does not fall on a better bearing stratum, or the soil body is washed by water flow, and the silty-fine sand geology is damaged by infiltration.
The foundation collapsible loess of the building is not fully filled and treated in the construction period, water molecules are wedged among soil particles due to the factors of pipeline leakage, change of the ground water level at the periphery and the like in the operation period, the connection thin film is damaged, salts are gradually dissolved, meanwhile, the water film is thickened, the shear strength of the soil is rapidly reduced, the soil body structure is gradually damaged under the action of the self-weight pressure of the soil and the additional pressure of the building, the foundation is collapsed due to the compaction of a framework, and the uneven sinking of the upper building is caused. The expansive soil is a clay component, mainly comprises hydrophilic mineral substances such as montmorillonite, illite, kaolinite and the like, has larger water absorption expansion, water loss shrinkage performance and strength attenuation performance, and is easy to cause uneven settlement of upper buildings and form cracks. A common disposal method is to cut off a water source, avoid continuously influencing a soil body, adopt means such as foundation grouting for reinforcement and the like, and enable the building to be normally used after foundation reinforcement measures are taken.
Aiming at unfavorable geological conditions such as collapsible loess and the like, a pile foundation is adopted for newly-built projects of buildings and roads in advance, and the upper load is born by the pile foundation. Aiming at unfavorable geology such as collapsible loess, a seepage-stopping wall is adopted to stop a water source, so that ground settlement damage is prevented.
When a building sinking accident occurs, the following problems occur:
1. because the soil body of the foundation is soft and empty, and a permeation channel exists, the surrounding buildings have risks, such as the foundation with local defects after sinking as shown in figure 1;
2. the building needs to be rebuilt, the bearing capacity of the foundation is weak, the risk that the original sunk building is difficult to demolish and reinforce is large, a cofferdam, a supporting and seepage-proofing system needs to be built firstly in the conventional method, the investment is large, and the period is long.
When the foundation of a hydraulic retaining or earth retaining building has the seepage-proofing requirement, if the seepage slope falls greatly, piping and soil flow phenomena occur, so that the foundation of the building is subjected to seepage damage, a large amount of soil is lost, the upper building is seriously settled, and the water retaining and earth retaining effects of the building are lost. Generally, a water retaining building needs to be constructed in a dry land by adopting a cofferdam under the requirements of construction conditions, equipment and the like. The cofferdam construction needs river cutting, water in the cofferdam is pumped, the cofferdam needs to pay attention to stability, seepage prevention safety, large investment, long time period and great influence on river flood and water transportation. The original sunk building is dismantled, and the safety of the peripheral building is greatly influenced.
Because the building settlement caused by the diseases is quite serious, the original building does not have the use function, and the conventional foundation treatment method cannot solve the problems. How to repair the sinking engineering water retaining building to meet the original function relates to the problems of continuous danger of cofferdams and surrounding buildings, investment, construction period and the like. In view of the above problems, solutions can generally be proposed: building a gravity cofferdam or a steel sheet pile or a steel pipe pile cofferdam at the periphery of the collapsed building, and repairing the water retaining and soil retaining building (wing wall); after the cofferdam is built, the original sunk building is broken, the demolished object is transported away, the rammed foundation is backfilled, the bottom plate of the building is built, and the upper building is built. When the cofferdam is built, a large construction platform or a backfill platform is generally required to be built, a plurality of reinforced concrete piles are constructed to form the semi-arc cofferdam, the construction period is long, and the investment is large.
The prior art, in order to restore the upper buildings, has the following premises, which are also disadvantages:
1. the construction of a cofferdam or a supporting structure is required to be completed firstly, and the construction of the cofferdam or the supporting structure is a difficult problem, for example, a riverbed around a lock has reinforced concrete or common concrete bottom protection, and simultaneously has the requirement of sailing, and the sailing can be influenced in the construction process; the river bed bottom protection is damaged in the construction process, the river channel can be scoured under the influence of ship traveling waves, and the safety of main engineering is not facilitated. The cofferdam or the supporting structure is built, so that the economic cost is high, the technical difficulty is high, and the time period is long;
2. then, the original building needs to be dismantled, the process of breaking the building under deeper water influences the safety of the surrounding buildings, and the original fragile stability is broken;
3. a large amount of construction waste is formed after being broken, and the original structure cannot be exerted;
4. huge gaps are formed after the construction, and potential safety hazards of deep foundation pits, cofferdam support and seepage prevention are large;
5. materials need to be used for backfilling in the pit, and if the soil is completely backfilled, rolling is difficult due to narrow space; if the concrete is completely backfilled, the cost is higher.
Therefore, for similar water retaining buildings, such as a water lock and the restoration construction after the wing walls of a ship lock sink, a simpler and effective design scheme is needed, on one hand, a cofferdam is not needed to be arranged, the original sunk building is not disturbed, and the corresponding functions of water retaining and soil retaining buildings and the like can be restored.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a method for rebuilding a sunken hydraulic structure, which overcomes the defects of the prior art, avoids the key steps of traditional methods such as cofferdam and demolition in the whole process, changes the sunken structure into a favorable foundation, realizes breakthrough and overcomes the defects of the common traditional scheme.
The technical scheme is as follows: the invention relates to a reconstruction method of a sunk hydraulic structure, which comprises the following steps:
step 1, underwater exploration: detecting and checking to know the elevation and plane position of each control point of the sunk building and the condition of the bottom of the building;
step 2, site treatment: removing impurities, keeping the existing sunk building, eliminating piping and soil flow factors, and strengthening the peripheral foundation by adopting compaction grouting to enhance the settlement deformation observation of the peripheral building;
step 3, building a construction platform: designing a construction platform according to the load in the construction period, and building the construction platform according to the design scheme;
in addition, the construction platform can also be as follows: the construction method is still a column, beam and plate structure platform, the backfill in the area is increased, the backfill does not make the requirement on the bearing capacity, and only serves as the condition that the pile body is poured to a higher position during the construction of the pile body; backfilling, rolling and hardening on the submerged hydraulic structure to ensure that the bearing capacity meets the construction requirement. The backfill is a simpler method, but is subject to the problems of slope release and range expansion, and the completed case does not meet the requirements of a simple backfill scheme due to the problem of navigation channels. According to the scheme, after pile construction is completed, upper backfill is cleaned, and then base plane leveling work is carried out to rebuild the building.
step 5, implementing pile foundation construction according to the pile foundation scheme provided in the step 4; the pile foundation penetrates through the sunken building and forms a whole with the sunken building; the pile foundation comprises a first stage pile foundation and a second stage pile foundation;
step 6, forming a foundation surface: and cleaning the top of the sunk building, leveling the underwater concrete to form a plane, and establishing a new foundation plane G on the top of the sunk building by combining the pile foundation and the upper load.
Further, step 5 specifically includes the following steps:
step 5-1, applying a casing to a designed bottom elevation by using full-rotation full-casing equipment, cleaning sediment at the bottom of the casing, placing a reinforcement cage, pouring common underwater concrete by using a guide pipe, and lifting the casing to a first section surface while pouring to form a first-stage pile foundation, wherein the first section surface is a contact surface between the bottom surface of the disturbed soil body at the bottom of the sinking pit and the casing; the first section is at least 3m from the bottom elevation.
Step 5-2, continuously lifting the sleeve upwards and pouring high-grade high-fluidity concrete to form a second-stage pile foundation, wherein the first-stage pile foundation and the second-stage pile foundation are integrated; and continuously filling high-grade concrete in the overlapped part of the second stage pile foundation and the sunk building, and filling the cavity of the sunk building by the high-grade concrete.
And 5-3, filling the high-grade concrete into the defect position between the sunk building and the bottom of the sinking pit simultaneously while performing the step 5-2, and automatically filling and compacting.
Further, step 6 specifically includes: and after the pile foundation and the bottom of the building are filled, cleaning the top surface of the sinking building position, and leveling the top surface by using the underwater undispersed self-leveling concrete so as to form a foundation surface for recovering the engineering.
Further, the process flow of the full-rotation full casing comprises the following steps:
s1: manufacturing a construction platform according to the design of the step 2;
s2: measuring and placing points;
s3: positioning a full-slewing drilling machine: according to the measurement lofting, positioning a mechanical base, mounting the drilling machine on a base after the mechanical base is positioned, and adjusting an adjusting oil cylinder at the bottom of the drilling machine to enable a mechanical bottom plate to be in a horizontal state;
s4: installing a sleeve:
s5: drilling and checking;
s6: manufacturing and installing a reinforcement cage and a detection pipe;
s7: installation conduit and hopper
S8: pouring underwater concrete;
s9: detecting the pile foundation by adopting an ultrasonic detection method;
s10: and (5) finishing and clearing the field.
Further, the design of the construction platform in the step 1 is specifically as follows: the construction platform consists of steel pipe piles and steel reinforced concrete composite beam slabs; the number of the steel pipe piles, the soil penetration depth, the specification of the section steel, the type of the reinforcing steel bars and the arrangement type are comprehensively determined according to the pile diameter of the building to be repaired and the selected full casing equipment.
Further, the common underwater concrete is underwater concrete with the reference number of C30; the high-grade concrete is underwater non-dispersive self-leveling fine aggregate concrete, the grade is C30, and the concrete can be added with reinforcing mesh sheets to improve the integrity of the structure.
Further, in the step 5-2, in the casing pipe lifting process, concrete in the casing pipe is guaranteed to be at least 2m, and pile breaking is prevented.
Has the advantages that: compared with the prior art, the invention has the advantages that: (1) after the sunk building is repaired, the effects of retaining water and soil and preventing ship collision are achieved on the one hand during the operation period, and the appearance is kept consistent with the original structure; on the other hand, in the construction period, the seepage-proofing safety and the supporting safety in the construction period are improved;
(2) the invention keeps the original building, takes the sunken building as an enlarged deep-buried foundation for restoration construction, and designs a large-scale construction platform for preventing the sunken building from disturbance, thereby not only meeting the construction load, but also being a backfill platform, and being a tubular pile, a steel structure and a steel-concrete combined platform which are separated from the original building;
(3) the invention introduces a large-scale hole-forming pile-forming new process, namely full-rotation full-casing equipment, so that a pile body can penetrate through a complex and hard reinforced concrete structure, the requirement of the engineering progress quality construction period is improved, and the reliability of the bearing capacity and the seepage-proofing capacity of a foundation and the quality of an underwater foundation surface leveling layer are improved by introducing underwater undispersed concrete and self-leveling concrete in the aspect of materials;
(4) the reconstruction method avoids the key steps of the traditional methods such as large cofferdam and demolition in the whole process, changes the sunk building into a favorable foundation, realizes breakthrough and overcomes the defects of the common traditional scheme.
Drawings
FIG. 1 is a schematic of the process of the present invention;
FIG. 2 is a schematic view of a pile foundation of the present invention;
in fig. 1, a is a first stage pile foundation, B is a second stage pile foundation, C is an integral pile foundation, D is a building, E is a water level, F is a foundation with a local defect after sinking, G is a foundation surface formed by upper backfill, H is an adjacent building, and I is a pile bottom elevation.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example 1
The method for rebuilding the sunken hydraulic structure shown in fig. 1 comprises the following steps:
step 1, underwater exploration: and (4) detecting and checking to know the elevation and plane position of each control point of the sunk building and the condition of the bottom of the building, wherein the height and plane position of each control point are detected by the height detection and checking device.
Step 2, site treatment: the method is characterized by removing impurities, keeping the existing sunk building, eliminating piping and soil flowing factors, and strengthening the peripheral foundation by adopting compaction grouting to enhance the settlement and deformation observation of the peripheral building.
The construction platform is specifically designed as follows: the construction platform consists of steel pipe piles and steel reinforced concrete composite beam slabs; the number of the steel pipe piles, the soil penetration depth, the specification of the section steel, the type of the reinforcing steel bars and the arrangement type are comprehensively determined according to the pile diameter of the building to be repaired and the selected full casing equipment.
Step 3, building a construction platform: and designing a construction platform according to the load in the construction period, and building the construction platform according to the design scheme.
Step 5, implementing pile foundation construction according to the pile foundation scheme provided in the step 3; the pile foundation penetrates through the sunken building and forms a whole with the sunken building; the pile foundation comprises a first stage pile foundation and a second stage pile foundation.
The step 5 specifically comprises the following steps:
step 5-1, applying a casing to a designed bottom elevation by using full-rotation full-casing equipment, cleaning sediments at the bottom of the casing, placing a reinforcement cage, pouring common underwater concrete by using a guide pipe, and lifting the casing to a first section surface while pouring to form a first-stage pile foundation A, wherein the first section surface is a contact surface between the bottom surface of a disturbed soil body at the bottom of a sinking pit and the casing; the first section is at least 3m from the bottom elevation.
Step 5-2, continuously lifting the sleeve upwards and pouring high-grade concrete simultaneously to form a second-stage pile foundation B, wherein the first-stage pile foundation and the second-stage pile foundation are an integral pile foundation C; and continuously filling high-grade concrete in the overlapped part of the second stage pile foundation and the sunk building, and filling the cavity of the sunk building by the high-grade concrete.
The common underwater concrete is underwater concrete with the label C30; the high-grade concrete is underwater non-dispersive self-leveling fine aggregate concrete and is marked as C30; in the process of lifting the sleeve, the concrete in the sleeve is ensured to be at least 2m, and pile breakage is prevented.
And 5-3, filling the high-grade concrete into the defect position between the sunk building and the bottom of the sinking pit simultaneously while performing the step 5-2, and automatically filling and compacting.
Step 6, forming a foundation surface: and cleaning the top of the sunk building, leveling the underwater concrete to form a plane, and establishing a new foundation plane G on the top of the sunk building by combining the pile foundation and the upper load.
The process flow of the full-rotation full-casing pipe comprises the following steps:
s1: manufacturing a construction platform according to the design of the step 2;
s2: measuring and placing points;
s3: positioning a full-slewing drilling machine: according to the measurement lofting, positioning a mechanical base, mounting the drilling machine on a base after the mechanical base is positioned, and adjusting an adjusting oil cylinder at the bottom of the drilling machine to enable a mechanical bottom plate to be in a horizontal state;
s4: installing a sleeve:
s5: drilling and checking;
s6: manufacturing and installing a reinforcement cage and a detection pipe;
s7: installation conduit and hopper
S8: pouring underwater concrete;
s9: detecting the pile foundation by adopting an ultrasonic detection method;
s10: and (5) finishing and clearing the field.
The step 5 specifically comprises the following steps: and after the pile foundation and the building bottom are filled, cleaning the top surface of the sinking building position, and leveling the top surface by implementing the underwater non-dispersive self-leveling concrete, so that a newly-built base surface G of the recovery project is formed, wherein the newly-built base surface can be slightly lower than the water level E.
As shown in fig. 1, a steel pipe pile or the like may be used as the construction platform. Because the construction load of equipment such as full casing pipe full rotation is large, a construction platform independent of the sunk building is suitable to be constructed, and the construction safety is prevented from being influenced by the disturbance of the sunk building or the instability of the sunk building; the pile foundation completed earlier can be designed as a platform foundation for the subsequent construction of the pile foundation.
The common concrete pumping method is used for filling the non-dispersed self-leveling concrete under water into the bottom and the peripheral defects of the building as much as possible. The common concrete pumping method refers to directly casting concrete.
After the casing is applied to the designed bottom elevation by using full-rotation full casing equipment, the sediment at the bottom of the casing is cleaned, a reinforcement cage is put in, common underwater concrete is poured by using a guide pipe, and the casing is lifted at the same time. When the concrete is poured to be close to the bottom defect of the sunk building, the common underwater concrete is changed into the underwater non-dispersive self-leveling concrete, the characteristics of the underwater non-dispersive self-leveling concrete are fully exerted under the action of the self weight of the concrete and certain concrete column pressure, and a defect cavity caused by leakage and the like is reliably filled, so that the sunk building is reliably seated on the foundation and forms a pile foundation-bearing platform foundation with the pile foundation.
After the filling work of the pile foundation and the bottom of the building is finished, cleaning the top surface of the sinking building position, and leveling the top surface by implementing underwater non-dispersive self-leveling concrete to form a foundation plane of the restoration project; in addition, the shallow recovery project below the water level can be completed under the condition of the shallow small cofferdam.
Example 2
Take the construction of a ship lock on a certain multi-line as an example. The compound line ship lock is closer to the first line ship lock, the geological conditions are extremely complex, a foundation pit seepage prevention and support system bears the water head water pressure of nearly 15m, the seepage prevention system is broken, piping seepage damage is generated at the bottom of a 3# wing wall of the first line ship lock, river water is flushed into a compound line ship lock foundation pit through the bottom of the wing wall, a large amount of soil at the bottom of the 3# wing wall is brought into the compound line ship lock foundation pit, and finally the 3# wing wall is caused to nearly and completely sink below the water surface. The 3# wing wall is about 20m long, 10m wide, 25m high and sinks for more than 10 m. On one hand, the wing wall needs to be rebuilt, and simultaneously, a supporting and seepage-proofing system of the foundation pit needs to be recovered. How to recover the anti-seepage and supporting system of the wing wall and the foundation pit is a very big problem.
By applying the technical scheme mentioned in the embodiment 1, 6 piles with the diameter of 1200mm, the pile bottom elevation of-11 m, the pile top elevation of 30m and the pile length of 41m are designed, main reinforcements and stirrups are configured, and the piles are arranged in 2 rows and 3 columns.
A large amount of work needs to be implemented on the platform, which puts requirements on the platform: (1) the requirement of the range of a plane field needs to borrow a larger range; (2) in the construction process of the pile body, the whole sleeve is pressed down and pulled out, and the recommended design value of pulling force is 4000 kN; (3) a reliable platform is needed for underwater concrete construction and compaction grouting construction. Due to the funnel-shaped topography caused by the permeation channel, underwater guide pipe construction is needed, the underwater concrete quality is ensured, and the underwater concrete can be effectively extruded to the bottom and the side face of the wing wall.
The method is characterized in that 16 steel pipe piles are used as a platform foundation, the diameter of each pile is 530mm, the wall thickness of each pile is 10mm, ZAXIS-470H crawler-type hydraulic vibration hammering is adopted, the impact force is 96t, the hammering depth is actually based on the field, and the pile sinking stopping hammer needs to be continuously vibrated for 5 minutes at the last redressing stage and cannot enter the pile sinking stopping hammer. The height of the top of the steel pipe pile is 33.5m, each group of the steel pipe piles is two, and a HW 400X 400 section steel beam is arranged between the two piles and welded on the top of the pile. The main beams are arranged in a through length mode and are directly placed on the distribution cross beams, and the other connecting system steel beams are connected with the main beams in a welding mode at the same elevation. The beam is connected with the steel pipe pile to increase a triangular stiffening plate.
The full-casing full-slewing drilling machine is used for completing pile foundation construction, and the full-casing-rotating full-casing process is a novel process and can penetrate adverse geological conditions including rocks, reinforced concrete, karst caves and the like. Before the full-casing full-rotation process is applied, two problems of instability of a foundation, the defect of filling by combining an underwater undispersed self-leveling concrete process and the like in platform construction need to be solved, and finally the advantages of the pile foundation construction process of the full-casing full-rotation equipment can be fully utilized, the key process of the pile foundation construction of the engineering is solved, and a pile foundation-bearing platform foundation is formed.
By means of the design and construction of the scheme, the wing wall recovery work and the foundation pit seepage prevention and support system repair are completed, cofferdam engineering, dismantling engineering and the like of other schemes are avoided, the construction period is ensured, the investment is reduced, and the benefit is remarkable.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited to the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A reconstruction method of a sunk hydraulic structure is characterized by comprising the following steps:
step 1, underwater exploration: the elevation and the plane position of each control point of the subsidence building and the bottom emptying condition of the building are known;
step 2, site treatment: removing impurities, keeping the existing sunk building, eliminating piping and soil flow factors, and strengthening the peripheral foundation by adopting compaction grouting to enhance the settlement deformation observation of the peripheral building;
step 3, building a construction platform: designing a construction platform according to the load in the construction period, and building the construction platform according to the design scheme;
step 4, designing a pile foundation scheme: designing the quantity, diameter and distribution position of pile foundations according to geological conditions, the self weight and structural characteristics of the sunk building, and the structural load and structural characteristics of upper restoration construction;
step 5, implementing pile foundation construction according to the pile foundation scheme provided in the step 4; the pile foundation penetrates through the sunken building and forms a whole with the sunken building; the pile foundation comprises a first stage pile foundation and a second stage pile foundation;
step 6, forming a foundation surface: and cleaning the top of the sunk building, leveling the underwater concrete to form a plane, and establishing a new foundation plane G on the top of the sunk building by combining the pile foundation and the upper load.
2. A method of rebuilding a sunken hydraulic structure as claimed in claim 1, wherein: the step 5 specifically comprises the following steps:
step 5-1, constructing the casing to a designed bottom elevation by using full-rotation full-casing equipment, cleaning sediment at the bottom of the casing, placing a reinforcement cage, pouring common underwater concrete by using a guide pipe, and gradually lifting the casing to a first section surface while pouring to form a first-stage pile foundation, wherein the first section surface is defined as a contact surface between the bottom surface of the disturbed soil body at the bottom of the sink pit and the casing; the first section surface is not less than 3m away from the bottom elevation of the disturbed soil body;
step 5-2, continuously lifting the sleeve upwards and pouring high-grade high-fluidity non-dispersive concrete simultaneously to form a second-stage pile foundation, wherein the first-stage pile foundation and the second-stage pile foundation are integrated; continuously filling high-grade high-fluidity non-dispersive concrete into a part of the second-stage pile foundation overlapped with the sunk building, and filling a cavity of the sunk building by the high-grade concrete;
and 5-3, filling the high-grade high-fluidity non-dispersible concrete into the defect position between the sunk building and the sunk pit bottom simultaneously while performing the step 5-2, and automatically filling and compacting.
3. A method of rebuilding a sunken hydraulic structure as claimed in claim 1, wherein: the step 6 specifically comprises the following steps: and after the pile foundation and the bottom of the building are filled, cleaning the top surface of the sinking building position, and leveling the top surface by using the underwater undispersed self-leveling concrete so as to form a foundation surface for recovering the engineering.
4. A method of rebuilding a sunken hydraulic structure as claimed in claim 1, wherein: the process flow of the full-rotation full casing comprises the following steps:
s1: manufacturing a construction platform according to the design of the step 2;
s2: measuring and placing points;
s3: positioning a full-slewing drilling machine: according to the measurement lofting, positioning a mechanical base, mounting the drilling machine on a base after the mechanical base is positioned, and adjusting an adjusting oil cylinder at the bottom of the drilling machine to enable a mechanical bottom plate to be in a horizontal state;
s4: installing a sleeve:
s5: drilling and checking;
s6: manufacturing and installing a reinforcement cage and a detection pipe;
s7: installing a guide pipe and a hopper;
s8: pouring underwater concrete;
s9: detecting the pile foundation by adopting an ultrasonic detection method;
s10: and (5) finishing and clearing the field.
5. The method for rebuilding a sunken hydraulic structure of claim 1, wherein: the construction platform in the step 2 is specifically designed as follows: the construction platform consists of a steel pipe pile and a steel reinforced concrete composite beam slab; the number of the steel pipe piles, the soil penetration depth, the specification of the section steel, the type of the reinforcing steel bars and the arrangement type are comprehensively determined according to the pile diameter of the building to be repaired and the selected full casing equipment.
6. A method of rebuilding a sunken hydraulic structure as claimed in claim 2, wherein: the common underwater concrete is underwater concrete with the label of C30; the high-grade concrete is underwater non-dispersive self-leveling fine aggregate concrete and is marked as C30.
7. A method of rebuilding a sunken hydraulic structure as claimed in claim 2, wherein: in the step 5-2, in the process of lifting the casing, the concrete in the casing is ensured to be at least 2m, and pile breakage is prevented.
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| CN112411574A (en) * | 2020-10-23 | 2021-02-26 | 浙江毕姆信息科技有限公司 | Old bridge pile position original site impact drill matched rotary drilling hole forming construction method |
| CN112554198A (en) * | 2020-11-04 | 2021-03-26 | 中建五局土木工程有限公司 | Construction method of deep foundation pit protection structure next to high-rise building |
| US20220145575A1 (en) * | 2019-08-09 | 2022-05-12 | Beijing Hengxiang Hongye Foundation Reinforcement Technology Co., Ltd. | High-rise building settling reinforcing and lifting correcting construction method |
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2022
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| CN1145439A (en) * | 1996-08-02 | 1997-03-19 | 丛蔼森 | Foundation supporting-changing method for grand building |
| CN103726673A (en) * | 2014-01-27 | 2014-04-16 | 龚金京 | Novel after-rooting composite pile foundation |
| CN104179204A (en) * | 2014-08-28 | 2014-12-03 | 山西钢铁建设（集团）有限公司 | Pile foundation underpinning method for building foundation adjacent to deep foundation pit |
| CN105220720A (en) * | 2015-10-20 | 2016-01-06 | 西安科技大学 | Building foundation, Collapsible Loess District reinforcing pile and pressing pile construction method thereof |
| US20220145575A1 (en) * | 2019-08-09 | 2022-05-12 | Beijing Hengxiang Hongye Foundation Reinforcement Technology Co., Ltd. | High-rise building settling reinforcing and lifting correcting construction method |
| CN112411574A (en) * | 2020-10-23 | 2021-02-26 | 浙江毕姆信息科技有限公司 | Old bridge pile position original site impact drill matched rotary drilling hole forming construction method |
| CN112554198A (en) * | 2020-11-04 | 2021-03-26 | 中建五局土木工程有限公司 | Construction method of deep foundation pit protection structure next to high-rise building |
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