CN114837455B - Method for reconstructing sunken hydraulic building - Google Patents
Method for reconstructing sunken hydraulic building Download PDFInfo
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- CN114837455B CN114837455B CN202210649859.XA CN202210649859A CN114837455B CN 114837455 B CN114837455 B CN 114837455B CN 202210649859 A CN202210649859 A CN 202210649859A CN 114837455 B CN114837455 B CN 114837455B
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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 reconstructing a sunken hydraulic building, which comprises the following steps: step 1, underwater exploration; 2. performing field treatment; 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 subsidence building and is integrated with the subsidence building; the pile foundations comprise a first-stage pile foundation and a second-stage pile foundation; step 6, forming a building base surface: cleaning the top of a subsidence building, leveling underwater self-leveling concrete to form a plane, and building a building surface on the top of the subsidence building by combining pile foundations and upper loads; 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 sinking building into a favorable foundation, realizes breakthrough and overcomes the defects of the general traditional scheme.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a method for reconstructing a sunken hydraulic building.
Background
The building needs to be reinforced to ensure engineering safety and usability due to the defect of the foundation, and the original building needs to be dismantled for reconstruction under serious conditions. The defect of the foundation is more, the foundation is collapsible and swelled, the foundation of the original building is not on a good bearing layer, or the soil body is flushed by water flow, and the fine sand geology is damaged by infiltration.
The collapsible loess of building foundation is not fully replaced in the construction period, is handled, receives factors such as pipeline water leakage, peripheral groundwater level change and the like in the operation period, causes water molecules to wedge between soil particles, destroys the connection film, gradually dissolves salt, simultaneously the water film is thickened, the shear strength of soil rapidly decreases, under the dead weight pressure of soil and the additional pressure of building, the soil body structure gradually destroys, and the skeleton squeezes tightly to cause the foundation to collapse, causes the uneven subsidence of superstructure. The expansive soil is a clay component, is mainly composed of hydrophilic minerals such as montmorillonite, illite, kaolinite and the like, has larger water-absorbing expansion, water-loss shrinkage performance and strength attenuation, and is easy to cause uneven settlement of an upper building and structure a plurality of cracks. The common disposal method is to cut off the water source, avoid the continuous influence on the soil body, strengthen by adopting means such as foundation grouting, and the like, and the building can be normally used after the foundation strengthening measures.
Aiming at unfavorable geological conditions such as collapsible loess, and the like, pile foundation treatment is adopted in advance for new projects of buildings and roads, and the upper load is borne by the pile foundation. Aiming at unfavorable geology such as collapsible loess, the water source is cut off by adopting a seepage-cutting wall, so that the ground is prevented from being subsided and damaged.
When a building subsidence accident occurs, the following problems occur:
1. because the soil body of the foundation is soft and hollow, and permeation channels exist, 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 built, the foundation bearing capacity is weak, the risk of dismantling and reinforcing the original subsidence building is high, the cofferdam, the support and the seepage prevention system are required to be built firstly by the conventional method, the investment is high, and the period is long.
When seepage prevention requirements exist on hydraulic water retaining or soil retaining building foundations, if seepage gradient is large, piping and soil flowing phenomena occur, so that the building foundations are damaged in a seepage manner, soil mass is largely lost, and the upper building is seriously settled, so that the functions of water retaining, soil retaining and the like of the building are lost. The general water retaining building is required to be constructed in dry land by adopting a cofferdam under the requirements of construction conditions, equipment and the like. The construction of the cofferdam needs to cut off the river, drain the water in the cofferdam, and the cofferdam needs to be stable, seepage-proof and safe, and has large investment, long time period and great influence on river flood and water transportation. The original subsidence building is removed, and the safety influence on surrounding buildings is great.
The settlement of the building caused by the diseases is quite serious, the original building has no use function, and the conventional foundation treatment method can not solve the problems. How to repair the engineering water retaining building after sinking meets the original functions, and relates to the problems of continuous danger emergence, investment, construction period and the like of cofferdams and surrounding buildings. For the above problems, solutions can generally be proposed: constructing gravity cofferdam, steel sheet piles and steel pipe pile cofferdam around the collapsed building, and repairing the water retaining and soil retaining building (wing wall); after the cofferdam is built, the original subsided building is broken, the demolished building is carried away, the foundation is rammed by backfilling, the building bottom plate is built, and the upper building is built. When the cofferdam is constructed, a large-scale construction platform or a backfilling platform is generally required to be constructed, a plurality of reinforced concrete piles are constructed to form a semicircular arc cofferdam, the construction period is long, and the investment is large.
The prior art, in order to restore the superstructure, has the following preconditions, also being a drawback:
1. the construction of the cofferdam or the supporting structure is firstly completed, and the construction of the cofferdam or the supporting structure is a difficult problem, for example, the river bed around the ship lock is provided with reinforced concrete or common concrete bottom protection, and meanwhile, the ship running requirement is met, and the ship running is influenced in the construction process; the river bed bottom protection is damaged in construction, and is influenced by ship travelling waves, so that the river channel can be flushed, and the safety of main engineering is not facilitated. Constructing a cofferdam or a supporting structure, and has high economic cost, large technical difficulty and long time period;
2. then, the original building needs to be dismantled, and the process of breaking the building under deeper water influences the safety of surrounding buildings, thereby breaking the original fragile stability;
3. after being broken, a large amount of construction waste is formed, and the original structure cannot be acted;
4. the huge gap formed after the breaking is large in potential safety hazard of deep foundation pit, cofferdam support and seepage prevention;
5. the pit needs to be backfilled by using materials, and if soil is completely backfilled, the pit is difficult to roll due to narrow space; if the concrete is completely backfilled, the cost is high.
Therefore, for the restoration construction of similar water retaining buildings, such as water locks and ship lock wing walls after sinking, a simpler and effective design scheme is needed, on one hand, a cofferdam is not needed to be arranged, the original sinking building is not disturbed, and the functions of water retaining and soil retaining buildings and the like can be restored.
Disclosure of Invention
The invention aims to: the invention aims to provide a method for reconstructing a sunken hydraulic building aiming at the defects of the prior art, the key steps of the traditional methods such as cofferdam and dismantling are avoided in the whole process, the sunken building is changed into an advantageous foundation, breakthrough is realized, and the defects of the general traditional scheme are overcome.
The technical scheme is as follows: the invention relates to a method for reconstructing a sunken hydraulic building, which comprises the following steps:
step 1, underwater exploration: exploring and checking to know the elevation and plane position of each control point of the sinking building and the bottom of the building is empty;
step 2, field treatment: removing sundries, reserving the existing subsidence building, eliminating piping and soil flowing factors, reinforcing peripheral foundations by adopting compaction grouting, and reinforcing the observation of the subsidence deformation of the peripheral building;
step 3, constructing 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: the backfill is still a column, beam and plate structure platform, and the backfill does not have bearing capacity requirement and is only used as a condition that the pile body is poured to a higher position during pile body construction; backfilling on the submerged hydraulic building, rolling and hardening to ensure that the bearing capacity meets the construction requirement. Backfilling is a simpler method, but is subject to the problems of slope releasing and range expanding, and the completed case does not meet the requirements of a simple backfilling scheme due to the problems related to the channel. According to the scheme, after the pile waiting construction is completed, the upper backfill soil is cleaned, and then the leveling work of the building base surface is carried out to reconstruct 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 subsidence building and is integrated with the subsidence building; the pile foundations comprise a first-stage pile foundation and a second-stage pile foundation;
step 6, forming a building base surface: the top of the subsidence building is cleaned, underwater concrete is leveled to form a plane, and a new building base surface is established at the top of the subsidence building by combining pile foundations and upper loads.
Further, the step 5 specifically includes the following steps:
step 5-1, applying the sleeve to the designed bottom elevation by utilizing full-rotation full-sleeve equipment, cleaning sediment at the bottom of the sleeve, placing a reinforcement cage, pouring ordinary underwater concrete by using a guide pipe, and lifting the sleeve to a first cut-off surface while pouring to form a pile foundation of a first stage, wherein the first cut-off surface is a contact surface between the bottom surface of a disturbed soil body at the bottom of a sinking pit and the sleeve; the first cut-off surface is at least 3m from the bottom elevation.
Step 5-2, continuously lifting the sleeve and simultaneously 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 pile foundation and the subsidence building in the second stage, and filling the cavity of the subsidence building with the high-grade concrete.
And 5-3, filling the high-grade concrete into the defect between the sinking building and the bottom of the sinking pit simultaneously while performing the step 5-2, and automatically filling and compacting.
Further, the step 6 specifically includes: after the pile foundation and the building bottom filling work are completed, the top surface of the sinking building position is cleaned, and self-leveling concrete leveling is carried out on the top surface underwater without dispersion, so that a building base surface of a recovery project is formed.
Further, the process flow of the full-rotation full sleeve is as follows:
s1: manufacturing a construction platform according to the design of the step 2;
s2: measuring the placement point;
s3: positioning the full-circle drilling machine: positioning a mechanical base according to the measurement lofting, and after the mechanical base is positioned, installing a drilling machine on the base, 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: and (3) mounting a sleeve:
s5: drilling and checking;
s6: manufacturing and installing a reinforcement cage and a detection tube;
s7: installation conduit and hopper
S8: pouring underwater concrete;
s9: detecting pile foundations by adopting an ultrasonic detection method;
s10: and (5) finishing a clearing house.
Further, the design of the construction platform in the step 1 is specifically as follows: the construction platform consists of a steel pipe pile and a steel reinforced concrete combined beam slab; the number of the steel pipe piles, the depth of the piles into the soil, the specification of the steel section, the type and the arrangement form of the steel bars are comprehensively determined according to calculation and the selected complete casing equipment of the building pile diameter to be repaired.
Further, the common underwater concrete is underwater concrete, and the reference number is C30; the high-grade concrete is underwater non-dispersive self-leveling fine stone concrete, the grade is C30, and the concrete can be added with reinforcing steel meshes to improve the structural integrity.
Further, in step 5-2, in the process of lifting the sleeve, the concrete in the sleeve is ensured to be at least 2m, and pile breakage is prevented.
The beneficial effects are that: compared with the prior art, the invention has the advantages that: (1) After the invention repairs the sinking building, on one hand, the invention has the effects of water blocking, soil retaining and ship collision prevention in the operation period, and keeps the consistent appearance with the original structure; on the other hand, in the construction period, the seepage-proof safety and the support safety in the construction period are improved;
(2) The invention reserves the original building, uses the sunk building as an enlarged embedded foundation to carry out restoration construction, prevents the sunk building from being disturbed, designs a large-scale construction platform, not only meets the construction load, but also can be a backfill platform, and can be a pipe pile, a steel structure and a steel-concrete combined platform separated from the original building;
(3) The invention introduces a large-scale pore-forming pile forming new process, namely full-rotation complete casing equipment, so that the pile body can pass through a complex and hard reinforced concrete structure, the quality and construction period requirements of engineering progress are improved, underwater non-dispersed concrete and self-leveling concrete introduced in terms of materials are improved, and the reliability of foundation bearing capacity and seepage-proofing capacity and the quality of an underwater building base surface leveling layer are improved;
(4) The reconstruction method avoids key steps of the traditional methods such as large cofferdam and dismantling in the whole process, changes the sinking building into an advantageous foundation, realizes breakthrough and overcomes the defects of the general traditional scheme.
Drawings
FIG. 1 is a schematic process diagram of the present invention;
FIG. 2 is a schematic diagram of a pile foundation according to 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 an upper backfill forming a building base surface, H is an adjacent building, and I is a pile bottom elevation.
Detailed Description
The technical scheme of the invention is described in detail below through the drawings, but the protection scope of the invention is not limited to the embodiments.
Example 1
A method of rebuilding a sunken hydraulic building as shown in fig. 1, comprising the steps of:
step 1, underwater exploration: and (5) exploring and checking to know the elevation and plane position of each control point of the sinking building and the bottom of the building is empty.
Step 2, field treatment: sundries are removed, the existing subsidence building is reserved, piping and soil flowing factors are eliminated, the periphery foundation is reinforced by compaction grouting, and the settlement deformation observation of the periphery building is enhanced.
The construction platform is specifically designed as follows: the construction platform consists of a steel pipe pile and a steel reinforced concrete combined beam slab; the number of the steel pipe piles, the depth of the piles into the soil, the specification of the steel section, the type and the arrangement form of the steel bars are comprehensively determined according to calculation and the selected complete casing equipment of the building pile diameter to be repaired.
Step 3, constructing a construction platform: according to the load in the construction period, a construction platform is designed, and the construction platform is built 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 subsidence building and is integrated with the subsidence building; the pile foundations comprise a first-stage pile foundation and a second-stage pile foundation.
The step 5 specifically comprises the following steps:
step 5-1, applying the sleeve to the designed bottom elevation by utilizing full-rotation full-sleeve equipment, cleaning sediment at the bottom of the sleeve, placing a reinforcement cage, pouring ordinary underwater concrete by using a guide pipe, and lifting the sleeve to a first cut-off surface while pouring to form a first-stage pile foundation A, wherein the first cut-off surface is a contact surface between the bottom surface of a disturbed soil body at the bottom of a sinking pit and the sleeve; the first cut-off surface is at least 3m from the bottom elevation.
Step 5-2, continuously lifting the sleeve and simultaneously pouring high-grade concrete 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 pile foundation and the subsidence building in the second stage, and filling the cavity of the subsidence building with the high-grade concrete.
The common underwater concrete is underwater concrete, and the reference number is C30; the high-grade concrete is underwater non-dispersive self-leveling fine stone concrete, and the grade is C30; in the process of lifting the sleeve, the concrete in the sleeve is ensured to be at least 2m, and the pile breaking is prevented.
And 5-3, filling the high-grade concrete into the defect between the sinking building and the bottom of the sinking pit simultaneously while performing the step 5-2, and automatically filling and compacting.
Step 6, forming a building base surface: the top of the subsidence building is cleaned, underwater concrete is leveled to form a plane, and a new building base surface is established at the top of the subsidence building by combining pile foundations and upper loads.
The process flow of the full-rotation full sleeve is as follows:
s1: manufacturing a construction platform according to the design of the step 2;
s2: measuring the placement point;
s3: positioning the full-circle drilling machine: positioning a mechanical base according to the measurement lofting, and after the mechanical base is positioned, installing a drilling machine on the base, 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: and (3) mounting a sleeve:
s5: drilling and checking;
s6: manufacturing and installing a reinforcement cage and a detection tube;
s7: installation conduit and hopper
S8: pouring underwater concrete;
s9: detecting pile foundations by adopting an ultrasonic detection method;
s10: and (5) finishing a clearing house.
The step 5 is specifically as follows: after the pile foundation and the building bottom filling work are completed, the top surface of the sinking building position is cleaned, and self-leveling concrete leveling is carried out on the top surface underwater without dispersion, so that a new base surface of a recovery project is formed, and the new base surface can be slightly lower than the water level E.
As shown in fig. 1, the construction platform may be a steel pipe pile or the like. Because the equipment such as full sleeve full rotation and the like has larger construction load, construction platforms independent of the subsidence building are preferably constructed, so that disturbance to the subsidence building is avoided, or the construction safety is influenced by the instability of the subsidence building; the finished pile foundation can be designed into a platform foundation for the subsequent construction of the pile foundation.
And filling the underwater undispersed self-leveling concrete into the bottom and peripheral defects of the building as much as possible by using a common concrete pumping method. The common concrete pumping method refers to directly pouring concrete.
After the sleeve is applied to the designed bottom elevation by using the full-rotation full-sleeve device, sediment at the bottom of the sleeve is cleaned, a reinforcement cage is arranged, and the common underwater concrete is poured by using a guide pipe, and meanwhile, the sleeve is lifted. When the concrete is poured near the defect at the bottom of the subsidence building, the common underwater concrete is changed into the underwater non-dispersion self-leveling concrete, the characteristics of the underwater non-dispersion self-leveling concrete are fully exerted under the action of the dead weight of the concrete and the pressure of a certain concrete column, and the defect cavity caused by leakage and the like is reliably filled, so that the subsidence building is reliably positioned on a foundation and forms a pile foundation-bearing platform foundation with a pile foundation.
After the filling work of the pile foundation and the building bottom is completed, cleaning the top surface of a sinking building site, and leveling the self-leveling concrete without dispersing the top surface underwater to form a building base surface of a recovery project; in addition, the shallow recovery engineering below the water level can be completed under the condition of the shallow small cofferdam.
Example 2
Taking a complex line lock as an example. The distance between the double-line ship lock and the double-line ship lock is relatively short, geological conditions are extremely complex, a foundation pit seepage-proofing and supporting system bears water head pressure of approximately 15m, piping seepage damage is generated at the bottom of a 3# wing wall of the double-line ship lock due to the fact that the seepage-proofing system is broken, river water rushes into the foundation pit of the double-line ship lock through the bottom of the wing wall, a large amount of soil body at the bottom of the 3# wing wall is brought into the foundation pit of the double-line ship lock, and finally the 3# wing wall is approximately completely sunk below the water surface. The 3# wing wall is about 20m long, 10m wide and 25m high and sinks for more than 10 m. On the one hand, the wing wall needs to be built, and meanwhile, the supporting and seepage-proofing system of the foundation pit needs to be restored. How to recover the seepage-proofing and supporting system of the wing wall and the foundation pit is a very great difficulty.
By using the technical scheme in the embodiment 1, 6 piles with the diameter of 1200mm, the pile bottom height of-11 m, the pile top height of 30m and the pile length of 41m are designed, main reinforcements and stirrups are arranged, and the piles are arranged in 2 rows and 3 columns.
A large amount of work needs to be performed on the platform, which requires: (1) The requirement of the range of the plane field is that a larger range is needed; (2) In the pile body construction process, a whole sleeve pressing and pulling process exists, and the pulling force proposal design value is 4000kN; (3) The construction of underwater concrete and compaction grouting requires a reliable platform. Due to the funnel-shaped topography caused by the permeation channel, underwater conduit construction is needed, the quality of underwater concrete is ensured, and the underwater concrete can be effectively extruded to the bottom and the side surface of the wing wall.
16 steel pipe piles are used as a platform foundation, the diameter of each pile is 530mm, the wall thickness is 10mm, ZAXIS-470H crawler type hydraulic vibration hammering is adopted, the impact force is 96t, the hammering depth is based on the actual field, and the pile sinking stopping hammer is continuously vibrated for 5 minutes in the final repeated hammering stage and cannot enter the standard. The height of the steel pipe pile top is 33.5m, two steel pipe piles are arranged in each group, a HW 400X 400 steel beam is arranged between the two piles, and the steel pipe piles are welded on the pile top. The main beams are arranged in a through length mode, are directly placed on the distribution cross beams, and the rest of the connecting steel beams are welded and connected with the main beams at the same elevation. The cross beam is connected with the steel pipe pile to increase triangular stiffening plates.
The pile foundation construction is completed by using the full-sleeve full-rotation drilling machine, and the full-rotation full-sleeve process is a novel process capable of penetrating unfavorable geological conditions including rock, reinforced concrete, karst cave and the like. Before the full-sleeve full-rotation technology is applied, two problems of foundation instability, filling defects by combining an underwater non-dispersion self-leveling concrete technology and the like are solved in the platform construction, and finally, the advantages of the full-sleeve full-rotation equipment pile foundation construction technology can be fully utilized, the key working procedure pile foundation construction of engineering is solved, and a pile foundation-bearing platform foundation is formed.
By the design and construction of the scheme, the wing wall recovery work, foundation pit seepage prevention and supporting system repair are completed, cofferdam engineering, demolition engineering and the like of other schemes are avoided, the construction period is ensured, the investment is reduced, and the benefit is remarkable.
As described above, although the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The method for reconstructing the sunken hydraulic building is characterized by comprising the following steps:
step 1, underwater exploration: knowing the elevation, the plane position and the bottom void condition of each control point of the sinking building;
step 2, field treatment: removing sundries, reserving the existing subsidence building, eliminating piping and soil flowing factors, reinforcing peripheral foundations by adopting compaction grouting, and reinforcing the observation of the subsidence deformation of the peripheral building;
step 3, constructing 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 number, diameter and distribution position of pile foundations according to geological conditions, dead weight and structural characteristics of a subsidence building and load and structural characteristics of an upper restoration construction structure;
step 5, implementing pile foundation construction according to the pile foundation scheme provided in the step 4; the pile foundation penetrates through the subsidence building and is integrated with the subsidence building; the pile foundations comprise a first-stage pile foundation and a second-stage pile foundation;
step 6, forming a building base surface: cleaning the top of a subsidence building, leveling underwater concrete to form a plane, and establishing a new building surface at the top of the subsidence building by combining pile foundations and upper loads;
the step 5 specifically comprises the following steps:
step 5-1, constructing a sleeve to a designed bottom elevation by utilizing full-rotation full-sleeve equipment, cleaning sediment at the bottom of the sleeve, placing a reinforcement cage, pouring ordinary underwater concrete by using a guide pipe, gradually lifting the sleeve to a first cut-off surface while pouring to form a pile foundation of a first stage, wherein the first cut-off surface is defined as a contact surface between the bottom surface of a disturbed soil body at the bottom of a sinking pit and the sleeve; the first cut surface is at least 3m away from the bottom elevation of the disturbance soil body;
step 5-2, continuously lifting the sleeve and simultaneously pouring high-grade high-fluidity undispersed concrete to form a second-stage pile foundation, wherein the first-stage pile foundation and the second-stage pile foundation are integrated; the pile foundation of the second stage is overlapped with the sinking building, high-grade high-fluidity undispersed concrete is continuously filled, and the cavity of the sinking building is filled by the high-grade concrete;
and 5-3, while the step 5-2 is carried out, filling the defect between the sinking building and the sinking pit bottom with the high-grade high-fluidity undispersed concrete, and automatically filling and compacting.
2. A method of rebuilding a sunken hydraulic building in accordance with claim 1, wherein: the step 6 specifically comprises the following steps: after the pile foundation and the building bottom filling work are completed, the top surface of the sinking building position is cleaned, and self-leveling concrete leveling is carried out on the top surface underwater without dispersion, so that a building base surface of a recovery project is formed.
3. A method of rebuilding a sunken hydraulic building in accordance with claim 1, wherein: the process flow of the full-rotation full sleeve comprises the following steps:
s1: manufacturing a construction platform according to the design of the step 3;
s2: measuring the placement point;
s3: positioning the full-circle drilling machine: positioning a mechanical base according to the measurement lofting, and after the mechanical base is positioned, installing a drilling machine on the base, 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: a mounting sleeve;
s5: drilling and checking;
s6: manufacturing and installing a reinforcement cage and a detection tube;
s7: installing a guide pipe and a hopper;
s8: pouring underwater concrete;
s9: detecting pile foundations by adopting an ultrasonic detection method;
s10: and (5) finishing a clearing house.
4. A method of rebuilding a sunken hydraulic building in accordance with claim 1, wherein: the design of the construction platform in the step 3 is specifically as follows: the construction platform consists of steel pipe piles and steel reinforced concrete composite beam plates; the number of the steel pipe piles, the depth of the piles into the soil, the specification of the section steel, the type and the arrangement form of the steel bars are comprehensively determined according to calculation according to the pile diameter of the building to be repaired and the selected complete casing equipment.
5. A method of rebuilding a sunken hydraulic building in accordance with claim 1, wherein: the common underwater concrete is underwater concrete, and the reference number is C30; the high-grade concrete is underwater non-dispersive self-leveling fine stone concrete, and the grade is C30.
6. A method of rebuilding a sunken hydraulic building in accordance with claim 1, wherein: in the step 5-2, in the process of lifting the sleeve, the concrete in the sleeve is ensured to be at least 2m, and the pile breaking is prevented.
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| CN1058312C (en) * | 1996-08-02 | 2000-11-08 | 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 |
| CN104179204B (en) * | 2014-08-28 | 2016-01-20 | 山西钢铁建设（集团）有限公司 | Building contiguous deep foundation ditch basis pile underpinning method |
| CN105220720B (en) * | 2015-10-20 | 2016-08-17 | 西安科技大学 | Collapsible Loess District building strengthening of foundation stake and pressing pile construction method thereof |
| CN112343106A (en) * | 2019-08-09 | 2021-02-09 | 北京恒祥宏业基础加固技术有限公司 | Construction method for settlement reinforcement, lifting and deviation correction of high-rise building |
| 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 |
| CN112554198B (en) * | 2020-11-04 | 2022-05-20 | 中建五局土木工程有限公司 | Construction method of deep foundation pit protection structure adjacent to high-rise building |
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