CN107130611B - Design and construction method of flexible composite anti-seepage assembled recoverable round-section row pile supporting structure - Google Patents

Design and construction method of flexible composite anti-seepage assembled recoverable round-section row pile supporting structure Download PDF

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CN107130611B
CN107130611B CN201710396035.5A CN201710396035A CN107130611B CN 107130611 B CN107130611 B CN 107130611B CN 201710396035 A CN201710396035 A CN 201710396035A CN 107130611 B CN107130611 B CN 107130611B
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pile
row
steel
construction
round
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CN107130611A (en
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王复明
潘艳辉
赵鹏
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Zhengzhou Anyuan Engineering Technology Co Ltd
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Zhengzhou Anyuan Engineering Technology Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D11/00Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes

Abstract

The invention relates to a design and construction method of a flexible composite anti-seepage fabricated recoverable round-section row pile supporting structure, which comprises the following steps: firstly, constructing round section row piles; (II) mounting the steel crown beam; thirdly, mounting a steel panel and grouting the steel panel; sequentially carrying out vertical layered and segmented excavation, (V) repeating the steps (III) and (IV), and constructing to the designed depth; and (VI) after the supporting structure finishes the use function, the recovery work can be carried out in steps along with the backfilling of the foundation pit. The flexible composite anti-seepage fabricated recoverable round-section row pile supporting structure system constructed by the invention has the advantages of safety, reliability, rapid construction, advanced technology, recoverability and reutilization, superior comprehensive economic and environmental-friendly indexes and the like, provides a novel method which is advanced in technology, safe, reliable, capable of efficiently recovering and reusing, superior in economic and environmental-friendly indexes for excavation supporting of projects such as foundation pits, side slopes, subway station ports, municipal pipelines and the like, and has considerable development and application prospects.

Description

Design and construction method of flexible composite anti-seepage assembled recoverable round-section row pile supporting structure
Technical Field
The invention belongs to the technical field of excavation and support of basic facilities such as civil engineering, water conservancy, mines, municipal administration and the like, and particularly relates to a design and construction method of a flexible composite anti-seepage fabricated recoverable circular-section row pile support structure for excavation construction of various side slopes, foundation pits, municipal pipelines and other projects.
Background
Since the establishment of new China, the construction of infrastructures in civil engineering, water conservancy, mines, municipal works and the like in China draws attention. In the process of underground space development and utilization, mineral resource exploitation and the like, when complex geological conditions are met, slope support or foundation pit support measures are often needed to be adopted so as to ensure the safety and stability of the underground engineering construction process and the surrounding environment in the process. With the development of geotechnical engineering technology, mechanical and civil engineering materials and the like, slope support and foundation pit support technology is effectively developed, and accordingly, support structure systems such as soil nailing walls, composite soil nailing walls, underground continuous walls, row pile supports, pile anchor supports and the like which take traditional building materials such as sand stones, cement, reinforcing steel bars, concrete and the like as structural bodies appear. Meanwhile, in order to control the influence of underground water on the supporting structure and the underground engineering construction, a waterproof curtain needs to be arranged in a supporting system or precipitation measures need to be taken as an auxiliary consideration. Particularly, under the conditions that the underground water level is high, the side wall soil layer is soft and easy to disturb, the side wall seepage prevention and underground water control measures must be considered in the foundation pit support. In contrast, the water stopping method can ensure the safety of peripheral buildings, structures and adjacent underground pipelines, and in many cases, accidents such as peripheral ground surface cracks induced by the creep deformation of the side wall soil body and uneven settlement of the buildings are caused. Theoretically, enough safety measures are taken, and the safety of the side slope or the foundation pit under any demand state can be ensured. However, from the essence of foundation pit support, the measures of temporary retaining, reinforcing, protecting and underground water controlling are adopted as the safety of the construction of the underground main body structure and the surrounding environment is protected, the deeper the foundation pit is, the more complicated the surrounding environment is, the higher the construction cost of the foundation pit engineering is, and more importantly, the service life of the foundation pit is generally not more than 2 years, and the foundation pit is abandoned or forcibly dismantled after the construction of the underground main body structure is finished. It follows that the cost of foundation pit engineering is very expensive compared to main body engineering. Even if a few foundation pits at the present stage adopt the design of integrating the supporting structure with the main structure of the underground engineering, the construction efficiency of the subsequent foundation engineering is reduced, the labor cost is greatly increased, and the potential risk of leakage of the subsequent construction joints is also very high.
Among the building materials generally adopted at present, the steel has better processing performance and superior mechanical property, and is widely applied to civil engineering. Meanwhile, the high polymer grouting technology is a foundation rapid reinforcing technology developed in the 70 s of the 20 th century. The technology achieves the purposes of reinforcing the foundation, filling and removing the void or lifting the settlement zone of the structure by injecting a high polymer material into the foundation and utilizing the characteristic that the volume of the high polymer material is rapidly expanded and solidified after chemical reaction. Based on the research on the mechanics and good machinable characteristics of steel and the characteristic research of a high polymer grouting technology, on the basis of the previous research of the team, the design and construction method of the flexible composite impermeable fabricated recoverable circular-section pile arranging supporting structure is invented on the basis of the applied patents with the numbers of 201310123667.6, 201610078440.8 and 201610077784.7, and by utilizing the characteristic that each direction of a symmetrical circular-section member is balanced in stress and has stronger corresponding deviation pressure, a brand-new supporting technology is provided for the excavation of projects such as foundation pits, side slopes, subway station mouths and municipal pipelines in the industries of civil engineering, water conservancy, mines, municipal administration and the like, and the flexible composite impermeable fabricated recoverable circular-section pile arranging supporting structure has the characteristics of high recovery value, reusability, standardized design and construction and the like. At present, no report related to a flexible composite anti-seepage assembly type recoverable round-section row pile supporting structure is seen in China.
Disclosure of Invention
The invention provides a design construction method of a flexible composite anti-seepage fabricated recoverable circular-section row pile supporting structure, aiming at development requirements of excavation supporting of projects such as foundation pits, side slopes, subway station mouths and municipal pipelines and defects of the existing supporting technology. The invention is based on the essence of foundation pit engineering, firstly provides a flexible composite design concept, introduces the ideas of mechanical precision manufacturing and field assembly standardized production into a foundation pit supporting structure system, and is researched and developed based on the soil pressure theory. In the construction process, the plane positioning and correcting platform is designed according to the size of the round-section row pile, the plane positioning and correcting platform just meets the requirement that the round-section row pile is introduced from the plane positioning and correcting platform and has a self-leveling function, the center preset by the plane positioning and correcting platform is superposed with the center of the round-section row pile, the construction requirement of the round-section row pile can be realized with high accuracy, the positioning accuracy of the round-section row pile is improved and controlled at the millimeter level, and meanwhile, the excellent mechanical and processing performances of steel, the rapid expansion and seepage prevention characteristics of high polymer materials and the accurate construction and installation process are fully exerted, and the design purpose of the invention is realized. The invention can be used for rapidly excavating and supporting projects such as foundation pits, side slopes, subway station openings, municipal pipelines and the like, after the use is finished, the cost of the foundation pit support can be greatly reduced by efficiently recovering the support structure, the mission of foundation pit engineering as a temporary safety measure is really realized and completed, and a novel method with advanced technology, safety, reliability and excellent economic indexes is provided for the excavation and support of the projects such as the foundation pits, the side slopes, the subway station openings, the municipal pipelines and the like.
The technical scheme adopted by the invention is as follows:
a design construction method of a flexible composite anti-seepage fabricated recoverable round-section row pile supporting structure comprises the following steps of firstly prefabricating and processing required supporting members in a factory after completing design work according to related data, and then constructing the supporting structure, wherein the construction process specifically comprises the following steps:
the round section row pile construction comprises the following specific steps:
(1) processing the round-section row piles: according to the design calculation result, steel is prefabricated and processed into round section row piles in a factory, crown beam mounting fixing holes and hoisting holes for later recovery are processed at the corresponding positions of the tops and pile bodies of the round section row piles, and recovery steel cables penetrate through the crown beam mounting fixing holes and the hoisting holes; according to design requirements, the round-section row pile supporting structure adopts a single-row pile supporting structure or a double-row pile supporting structure;
(2) pile row pore-forming construction: in the appointed ground position, a pile machine is utilized to carry out the hole forming construction of the supporting row piles, and the hole forming precision, including the plane positioning precision and the pile hole vertical precision, is strictly controlled in the construction process;
(3) implanting the round-section row piles: accurately implanting the round-section row piles into the determined pile hole positions by using a crane and a plane positioning correction platform to meet the requirement of designed positioning accuracy; when a double-row pile supporting structure is adopted, the difference of the structures of the front row of piles and the rear row of piles is well controlled;
(4) backfilling the pile holes, namely backfilling the pile holes by adopting materials suitable for stratum requirements to ensure the stability of soil bodies around the round-section row piles, wherein the backfilling materials are low-grade concrete, gravels and high polymer materials;
(II) the concrete steps of the steel crown beam are as follows:
(1) processing the section steel crown beam: according to the shape and design of a foundation pit, punching treatment of a pile top section steel crown beam and a crown beam mounting hole is accurately processed, and a mechanical stretch bending processing technology is adopted as necessary to facilitate bolt connection of the section steel crown beam;
(2) splicing and mounting the section steel crown beam: after the single-row pile or double-row pile construction is finished and before a foundation pit is excavated, firstly, the elevation of the profile steel crown beam is controlled by a level gauge, then, the position of the profile steel crown beam is preliminarily fixed by a crane, and finally, the profile steel crown beam is fixedly connected with the top of the row pile by a high-strength bolt;
and (III) installing the steel panel, wherein the concrete construction steps are as follows:
(1) excavating earthwork in the foundation pit in a layered and segmented manner, controlling the excavation depth of each layer to be about 0.5m, cleaning up the soil body near pile arrangement or front arrangement by adopting a manual method, and performing layered and segmented construction;
(2) installing a steel panel on the side wall of the cleaned row pile, and specifically implementing the following steps:
a. processing a steel panel: firstly, determining the size of a steel panel according to the row pile spacing and the height suitable for manual operation, and cutting and punching the steel panel; if the steel panel is fixed by screws, the steel panel needs to be punched in advance; if a welding process is adopted, the welding part is subjected to rust removal and cleaning treatment before welding;
b. installing a steel panel: before installation, a level gauge is used for positioning and correcting the steel panel, then the steel panel is installed by adopting a screw connection or welding process according to design and construction requirements, and the steel panel is firmly fixed on the profile steel slope protection pile;
c. post grouting of the steel panel: in order to ensure that the steel panel is tightly combined with the side wall soil body to prevent the soil body on the pile side from creeping, a rapid expansion and hardening high polymer material is injected at the back of the steel panel to form a thin-layer high polymer laminated structure with certain strength and toughness, so that the overlarge deformation of the side wall soil body can be controlled, and the leakage of a joint can be prevented;
sequentially and vertically layering and sectionally excavating;
fifthly, repeating the third step and the fourth step, and constructing to the designed base elevation to finish the construction of the flexible composite anti-seepage fabricated recoverable circular-section row pile supporting structure;
after the supporting structure finishes the use function, along with the beginning of the backfilling work of the foundation pit, the work of the recovery stage can be carried out, and the specific recovery steps are as follows:
(1) along with the progress of the backfilling work of the foundation pit, firstly recovering the lower steel panel;
(2) backfilling and compacting layer by layer, and dismantling and recovering the steel panels at the corresponding positions layer by layer;
(3) dismantling and recovering the section steel crown beam at the top of the row pile;
(4) the crane is matched with a hydraulic jack to complete the pulling-out and the recovery of the round-section row piles.
Compared with the existing supporting technology, the invention has the following advantages:
(1) the fine essential characteristics that embody foundation ditch engineering of novel supporting construction's service function that this patent technique provided: safe and reliable, advanced technology and superior economic index. The foundation pit engineering is used as a temporary safety measure for ensuring the construction of an underground main body structure, safety and reliability are the primary factors, advanced technology and superior economic indexes are reliable standards for distinguishing and evaluating the quality of a supporting structure.
(2) The material has perfect performance, fully combines the mechanical and processing performance of steel, isotropy of a circular symmetrical structure and rapid expansion and seepage-proofing performance of a high polymer material, and has definite force transmission and stress mode and safe and reliable structure. The defect of weakening the local strength of the structure caused by the traditional support pile construction process is effectively overcome.
(3) The components are machined precisely and produced in a standardized mode. The steel circular cross section row pile, steel panel, pile top shaped steel crown beam in the excavation supporting structure system that this patent technique provided all adopt standardized production technology to carry out mechanical accuracy and process, simultaneously through the construction link to the accurate control of technology, with installation accuracy control at the millimeter level, when being convenient for install, also be convenient for retrieve reuse, therefore to a kind of problem, also realized standardized design and construction exactly.
(4) The construction is quick and the maintenance is not needed. The circular-section row piles, the steel panels, the pile top section steel crown beams and the like are produced in an industrial mode, continuous operation is conducted on the site according to the construction sequence, construction is rapid, and maintenance is not needed. The high polymer material has the strength, toughness and impermeability of about 90% within 15 minutes after reaction, and compared with the traditional supporting structure system, the construction period can be saved by more than 50% on the whole.
(5) The supporting structure provided by the patent can meet the foundation pit supporting design and construction tasks within a certain depth range and with different peripheral environments.
(6) The comprehensive economic and environmental protection benefits are more advantageous. Compared with the traditional supporting technology, the flexible composite anti-seepage recyclable supporting structure has the greatest characteristics that during construction, the pollution of slurry, dust, concrete and the like to the environment can be reduced, the use stage of the foundation pit is safe and reliable, meanwhile, the subsequent recycling value is high, the structure can be repeatedly used, and a large amount of construction period is saved.
Therefore, the design and construction method of the flexible composite anti-seepage fabricated recoverable circular-section row pile supporting structure has obvious advantages in the construction process of projects such as foundation pits, side slopes, subway station mouths and municipal pipeline excavation. Compared with the existing supporting technology, the design and construction method of the flexible composite anti-seepage assembly type recoverable round-section row pile supporting structure is a whole set of brand new technology and mainly shows that:
(1) the design concept of the brand-new supporting structure is as follows: in the foundation pit supporting structure, the flexible composite design concept is firstly provided from the essence of foundation pit engineering, the ideas of mechanical precise manufacturing and on-site assembly standardized production are introduced into a foundation pit supporting structure system, and the situation that the supporting structure of each project is independently designed and is abandoned after the using function is exerted is changed. The supporting structure adopts standardized design and construction, can adopt a solution mode for the same kind of problems, simplifies the design and construction process, can realize the efficient recovery and the reutilization of the supporting structure after the use function is exerted, and really embodies the essential characteristics of foundation pit engineering as a temporary safety measure.
(2) The stress division of the flexible composite anti-seepage fabricated recoverable round-section row pile supporting structure system is definite: the thin layer structure with good toughness formed by the high polymer material well plays a role of 'flexibility', fills and closes the rigidity difference between the supporting structure and the side wall soil body, enables the deformation of the row pile structure and the side wall soil body to be coordinated, and simultaneously plays roles in preventing seepage and controlling the lateral creep of the soil body; the row pile supporting structure plays a role of 'steel', soil pressure is born by the row piles and the pile top section steel crown beams through the steel panels, the structure stress is reasonable, and the mechanical properties of materials are fully played. The member bearing the soil pressure has the advantages of uniform material, isotropy, clear mechanical index and more reasonable and reliable structure.
(3) The construction standardization degree is high: the steel circular-section row piles, the steel face plates, the profile steel crown beams and the like in the flexible composite anti-seepage fabricated recoverable circular-section row pile supporting structure system can be machined precisely, the pile position precision of the most critical steel circular-section row piles in the supporting structure is improved to a millimeter level through the independently designed plane positioning correction platform on site, the standardized and rapid installation of various subsequent works is facilitated, and the later-stage recovery and the repeated use of the structure are facilitated.
(4) The side wall seepage-proofing effect of the side slope is obvious, and the pertinence is strong. In the excavation process of the foundation pit earthwork, through direct disclosure of the excavation process, a high polymer thin-layer structure with toughness and an anti-seepage water-retention function is formed by utilizing rapid expansion of a high polymer material between a side wall soil body and a structural system, and meanwhile, the high polymer material reinforces a weak part of the side wall soil body in the expansion process, so that a supporting structure is combined with the surrounding soil body relatively tightly, and no obvious weak link exists.
(5) The structure rate of recovery is high, reuse rate is high: most components of the flexible composite anti-seepage assembly type recoverable circular-section row pile supporting structure system are steel components produced in a standardized manner, so that the recovery rate is high, and the recovery value is high; meanwhile, the recovered supporting member can be recycled for multiple times in the subsequent same type of supporting projects.
In conclusion, the invention is obviously different from the prior supporting technology in aspects of the design concept, stress mechanism, standardized construction, side wall anti-seepage treatment effect, recycling value of a structural system and the like of the supporting structure, has the advantages of safety, reliability, rapid construction, advanced technology, recycling, superior economic index and the like, is successfully applied to foundation pit supporting engineering, and has considerable development and application prospects.
Drawings
FIG. 1 is a large sample diagram of a round section row pile processing node.
Figure 2 is a cross-sectional view of a round section row pile construction.
Fig. 3 is a sectional elevation view of the flexible composite impermeable round section row pile supporting structure.
FIG. 4 is a schematic view of a steel panel installation node.
Fig. 5 is a horizontal sectional view of the flexible composite impermeable round section row pile supporting structure.
Fig. 6 is an elevation view of the completed flexible composite impermeable round section row pile supporting structure.
Remarks to the attached drawings: 1-round section row pile, 2-crown beam installation fixing hole, 3-hoisting hole, 4-recovery steel cable, 5-ground, 6-pile hole, 7-rear pile, 8-backfill material, 9-section steel crown beam, 10-bolt, 11-steel panel, 12-screw, 13-high polymer material and 14-substrate.
Detailed Description
The invention will be further explained with reference to the drawings.
A design and construction method of a flexible composite anti-seepage fabricated recoverable round-section row pile supporting structure is characterized in that in the design of a foundation pit supporting structure, a design concept of constructing flexible composite is firstly provided from the essence of foundation pit engineering, ideas of mechanical precise manufacturing and on-site assembly standardized production are introduced, after design work is completed according to relevant data, required supporting components are prefabricated and processed in a factory, then on-site assembly construction and foundation pit backfilling of the supporting structure are carried out, the supporting structure is synchronously dismantled and recovered, and the supporting structure can be repeatedly used and designed and constructed. The construction process specifically comprises the following steps:
the round section row pile construction comprises the following specific steps:
(1) processing the round-section row pile 1: according to the design calculation result, steel is prefabricated and processed into the round section row piles in a factory, the crown beam mounting fixing holes 2 and the hoisting holes 3 for later recovery are processed at the corresponding positions of the tops and the pile bodies of the round section row piles, and the steel cables 4 are penetrated and recovered, as shown in figure 1. According to design requirements, the round-section row pile supporting structure can adopt a single-row pile supporting structure and also can adopt a double-row pile supporting structure.
(2) Pile row pore-forming construction: and (3) at the position 5 on the designated ground, utilizing a pile machine to carry out the pore-forming construction of supporting row piles, and strictly controlling the pore-forming precision in the construction process, wherein the pore-forming precision comprises the plane positioning precision and the pile hole vertical precision.
(3) Implanting the round-section row piles: the circular-section row piles are accurately implanted into the determined pile hole 6 position by using a crane and an independently designed plane positioning correction platform, and the designed positioning precision requirement is met. When a double-row pile supporting structure is adopted, the structural difference of the front row of piles 1 and the rear piles 7 is well controlled.
(4) And (3) backfilling the pile holes, namely backfilling the pile holes by adopting materials suitable for stratum requirements to ensure the stability of the soil body around the round-section row piles, wherein the backfilling materials 8 can be low-grade concrete, gravel, high polymer materials and the like, as shown in figure 2.
(II) the concrete steps of the steel crown beam are as follows:
(1) processing the section steel crown beam 9: according to the shape and design of the foundation pit, the pile top section steel crown beam and the punching treatment of the mounting hole of the crown beam are accurately processed, and a mechanical stretch bending processing technology is adopted as necessary to facilitate the connection of the section steel crown beam by the bolt 10.
(2) Splicing and mounting the section steel crown beam: after the single-row pile or double-row pile construction is finished and before the foundation pit is excavated, firstly, the elevation of the profile steel crown beam is controlled by a level gauge, then, the position of the profile steel crown beam is preliminarily fixed by a crane, and finally, the profile steel crown beam is fixedly connected with the top of the row pile by a high-strength bolt, as shown in fig. 3.
And (III) installing the steel panel 11, wherein the concrete construction steps are as follows:
(1) and excavating earthwork in the foundation pit in a layered and segmented manner, controlling the excavation depth of each layer to be about 0.5m, cleaning soil bodies near pile arrangement or front arrangement by adopting a manual method, and performing layered and segmented construction.
(2) Installing a steel panel on the side wall of the cleaned row pile, and specifically implementing the following steps:
a. processing a steel panel: firstly, the size of the steel panel is determined according to the row pile spacing and the height suitable for manual operation, and the steel panel is cut and punched. If the screw 12 is adopted to fix the steel panel, the steel panel needs to be punched in advance; if the welding process is adopted, the welding part is subjected to rust removal and cleaning treatment before welding.
b. Installing a steel panel: before installation, the steel panel is positioned and corrected by adopting the level gauge, then the steel panel is installed by adopting a screw connection or welding process according to the design and construction requirements, and the steel panel is firmly fixed on the profile steel slope protection pile, as shown in figure 4.
c. Post grouting of the steel panel: in order to ensure that the steel panel is tightly combined with the side wall soil body to prevent the soil body on the pile side from creeping, a rapid expansion hardening high polymer material 13 is injected into the back of the steel panel to form a thin layer high polymer layered structure with certain strength and toughness, so that the overlarge deformation of the side wall soil body can be controlled, and the seam leakage can be prevented, as shown in fig. 5.
Sequentially and vertically layering and sectionally excavating;
and (V) repeating the steps (III) and (IV), and constructing to the designed base 14 elevation, namely completing the construction of the flexible composite impermeable fabricated recoverable circular-section row pile supporting structure, as shown in figure 6.
After the supporting structure finishes the use function, along with the beginning of the backfilling work of the foundation pit, the work of the recovery stage can be carried out, and the specific recovery steps are as follows:
(1) as the foundation pit backfilling work progresses, the lower steel panel 13 is first recovered.
(2) Backfilling layer by layer, compacting, and removing layer by layer to recover the steel panels at the corresponding positions.
(3) And dismantling and recovering the profile steel crown beam 9 at the top of the row pile.
(4) The crane is matched with a hydraulic jack to complete the extraction and recovery of the round-section row piles 1.
It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.

Claims (1)

1. A design and construction method of a flexible composite anti-seepage fabricated recoverable round-section row pile supporting structure is characterized by comprising the following steps:
the round section row pile construction comprises the following specific steps:
(1) processing the round-section row piles: according to the design calculation result, steel is prefabricated and processed into round section row piles in a factory, crown beam mounting fixing holes and hoisting holes for later recovery are processed at the corresponding positions of the tops and pile bodies of the round section row piles, and recovery steel cables penetrate through the crown beam mounting fixing holes and the hoisting holes; according to design requirements, the round-section row pile supporting structure adopts a single-row pile supporting structure or a double-row pile supporting structure;
(2) pile row pore-forming construction: in the appointed ground position, a pile machine is utilized to carry out the hole forming construction of the supporting row piles, and the hole forming precision, including the plane positioning precision and the pile hole vertical precision, is strictly controlled in the construction process;
(3) implanting the round-section row piles: accurately implanting the round-section row piles into the determined pile hole positions by using a crane and a plane positioning correction platform to meet the requirement of designed positioning accuracy; when a double-row pile supporting structure is adopted, the difference of the structures of the front row of piles and the rear row of piles is well controlled;
(4) backfilling the pile holes, namely backfilling the pile holes by adopting materials suitable for stratum requirements to ensure the stability of soil bodies around the round-section row piles, wherein the backfilling materials are low-grade concrete, gravels and high polymer materials;
(II) the concrete steps of the steel crown beam are as follows:
(1) processing the section steel crown beam: according to the shape and design of a foundation pit, punching treatment of a pile top section steel crown beam and a crown beam mounting hole is accurately processed, and a mechanical stretch bending processing technology is adopted as necessary to facilitate bolt connection of the section steel crown beam;
(2) splicing and mounting the section steel crown beam: after the single-row pile or double-row pile construction is finished and before a foundation pit is excavated, firstly, the elevation of the profile steel crown beam is controlled by a level gauge, then, the position of the profile steel crown beam is preliminarily fixed by a crane, and finally, the profile steel crown beam is fixedly connected with the top of the row pile by a high-strength bolt;
and (III) installing the steel panel, wherein the concrete construction steps are as follows:
(1) excavating earthwork in the foundation pit in a layered and segmented manner, controlling the excavation depth of each layer to be about 0.5m, cleaning up the soil body near pile arrangement or front arrangement by adopting a manual method, and performing layered and segmented construction;
(2) installing a steel panel on the side wall of the cleaned row pile, and specifically implementing the following steps:
a. processing a steel panel: firstly, determining the size of a steel panel according to the row pile spacing and the height suitable for manual operation, and cutting and punching the steel panel; if the steel panel is fixed by screws, the steel panel needs to be punched in advance; if a welding process is adopted, the welding part is subjected to rust removal and cleaning treatment before welding;
b. installing a steel panel: before installation, a level gauge is used for positioning and correcting the steel panel, then the steel panel is installed by adopting a screw connection or welding process according to design and construction requirements, and the steel panel is firmly fixed on the profile steel slope protection pile;
c. post grouting of the steel panel: in order to ensure that the steel panel is tightly combined with the side wall soil body to prevent the soil body on the pile side from creeping, a rapid expansion and hardening high polymer material is injected at the back of the steel panel to form a thin-layer high polymer laminated structure with certain strength and toughness, so that the overlarge deformation of the side wall soil body can be controlled, and the leakage of a joint can be prevented;
sequentially and vertically layering and sectionally excavating;
fifthly, repeating the third step and the fourth step, and constructing to the designed base elevation to finish the construction of the flexible composite anti-seepage fabricated recoverable circular-section row pile supporting structure;
after the supporting structure finishes the use function, along with the beginning of the backfilling work of the foundation pit, the work of the recovery stage can be carried out, and the specific recovery steps are as follows:
(1) along with the progress of the backfilling work of the foundation pit, firstly recovering the lower steel panel;
(2) backfilling and compacting layer by layer, and dismantling and recovering the steel panels at the corresponding positions layer by layer;
(3) dismantling and recovering the section steel crown beam at the top of the row pile;
(4) the crane is matched with a hydraulic jack to complete the pulling-out and the recovery of the round-section row piles.
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