Ecological sheet pile steel formwork system and construction method thereof

Abstract

The invention discloses an ecological pile steel formwork system and a construction method thereof. The ecological pile steel formwork system comprises a foundation module, a base, a pile body end plate and a pile head end plate. The basic module comprises a bottom die, a side die and a hinge, the bottom die and the side die are connected through the hinge, and a convex template is arranged on the bottom die; the base comprises a square steel tube, single-spliced channel steel and double-spliced channel steel, and the square steel tube, the single-spliced channel steel and the double-spliced channel steel are connected through welding; the pile body end plate comprises at least one of a steel template with a pile tip and a steel template without the pile tip; the pile head end plate comprises a pile head steel template and an ecological hole steel template, and the ecological hole steel template is arranged on the pile head steel template; wherein the basic module and the base are fixed through welding; the foundation module, the pile body end plates and the pile head end plates are transversely connected through U-shaped bolts; lower hanging steel plates are arranged on the lower portion of the pile body end plate and the lower portion of the pile head end plate and inserted into the double-spliced channel steel of the base to be positioned. The device is simple in structure and convenient to mount and dismount.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological sheet pile production, in particular to an ecological sheet pile steel formwork system and a construction method thereof. Background Art

[0002] Ecological sheet piles, combining structural strength with ecological benefits, are widely used in river management, slope protection, and other fields. Currently, prestressed pretensioning has become the primary production process for ecological sheet piles, effectively improving their crack resistance. In this process, the design of the steel formwork directly impacts the dimensional accuracy of the sheet piles, the efficiency of prestress transfer, and the quality of the ecological structure.

[0003] In the existing technology, traditional steel formwork has the following main problems: on the one hand, the length of the existing steel formwork is fixed, and one length of pile corresponds to one steel formwork, which increases the production cost; on the other hand, for the concave and convex tongue and groove, vegetation channels and other structures unique to ecological sheet piles, the molding accuracy of the existing formwork is insufficient, and it is difficult to meet the project's requirements for the sealing and ecological function of the sheet pile splicing; at the same time, traditional steel formwork mostly adopts a bolt-fastened disassembly and assembly structure, and the disassembly and assembly time of a single set of formwork is too long, which cannot meet the needs of large-scale construction and is also prone to causing molding defects of the ecological sheet piles. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, an ecological sheet pile steel formwork system and a construction method thereof are provided, which have a simple structure and are easy to install and disassemble.

[0005] The technical solution adopted by the present invention is: an ecological pile steel formwork system, comprising a foundation module, a base, a pile body end plate and a pile head end plate; the foundation module comprises a bottom formwork, a side formwork and a hinge, the bottom formwork and the side formwork are connected by the hinge, and a convex formwork is provided on the bottom formwork; the base comprises a square steel tube, a single-piece channel steel and a double-piece channel steel, and the square steel tube, the single-piece channel steel and the double-piece channel steel are connected by welding; the pile body end plate comprises at least one of a steel formwork with a pile tip and a steel formwork without a pile tip; the pile head end plate comprises a pile head steel formwork and an ecological hole steel formwork, and the ecological hole steel formwork is arranged on the pile head steel formwork; wherein, the foundation module is fixed to the base by welding; the foundation module, the pile body end plate and the pile head end plate are horizontally connected by a U-shaped pin; a lower hanging steel plate is provided at the lower part of the pile body end plate and the pile head end plate, and the lower hanging steel plate is inserted into the double-piece channel steel of the base for positioning;

[0006] The ecological pile steel formwork system further comprises a standard module, the standard module comprises a bottom die, a side die, a hinge and a limiting plate, the bottom die and the side die are connected through the hinge, the limiting plate is arranged at the bottom of the side die, and the length of the standard module is adjustable; the standard module is placed on the base through the limiting plate at the bottom thereof; the standard module, the base module and the pile end plate are transversely connected through U-shaped bolts.

[0007] In order to solve the problem of how to realize fast and accurate positioning and connection between modules and avoid the low efficiency and mispositioning of traditional bolt connection, the U-shaped bolt in the technical scheme comprises a first U-shaped bolt for connecting the side die and a second U-shaped bolt for connecting the base, and a positioning bolt hole is arranged on the side die and matched with the first U-shaped bolt. Through the special bolt (the first U-shaped bolt connects the side die, and the second U-shaped bolt connects the base) and the positioning bolt hole, modular accurate assembly is realized, the construction efficiency is improved, meanwhile, the separate type bolt design prevents misoperation and ensures the stability of the connection between the base and the side die.

[0008] In order to optimize the structure of the side die to balance the strength, weight and cost, and at the same time adapt to the curved surface modeling requirement of the ecological pile, the side die in the technical scheme is composed of a U-shaped steel plate, a ribbed plate and an arc-shaped steel plate; wherein the U-shaped steel plate and the ribbed plate are made of Q355 steel plates with a thickness of 4-6 mm, the arc-shaped steel plate is made of Q245 steel plates with a thickness of 5-7 mm, and the spacing between the ribbed plates is 900-1100 mm. The U-shaped steel plate provides main support, the arc-shaped steel plate meets the curved surface forming, the ribbed plate enhances the anti-deformation capacity, the key stress position is made of high-strength Q355 steel plate, and the non-key curved surface is made of low-cost Q245 steel plate, so that lightweight and cost control are realized.

[0009] In order to realize the selection of the standard base channel steel to reduce the procurement and maintenance cost, the single-punched channel steel in the base is a 5# channel steel, and the double-punched channel steel is a 5# channel steel in the technical scheme. The single-punched channel steel and the double-punched channel steel in the base are uniformly made of 5# channel steel, which simplifies the supply chain management and improves the interchangeability of parts, meanwhile, the double-punched channel steel enhances the bearing capacity of the base and ensures the overall stability of the formwork system.

[0010] In order to improve the durability of the bottom die and control the manufacturing cost, the bottom die in the technical scheme is made of Q355 steel plates with a thickness of 4-6 mm and is sheared and formed. The Q355 steel plate with shearing and forming has high strength and forming precision, can resist concrete impact deformation and significantly prolong the service life.

[0011] To adapt to the prestressed construction process and avoid damage to the end plate structure due to subsequent drilling, the present invention further specifically stipulates that in the above technical solution, prestressed tendon holes are provided on both the pile body end plate and the pile head end plate. By pre-installing the prestressed tendon holes, the tensioning process is ensured to be formed in one step, thus ensuring the structural integrity and positioning accuracy of the end plate.

[0012] To flexibly accommodate varying pile length requirements and reduce non-standard customization costs, the present invention further specifies that, in the above technical solution, the standard modules include 1m and 2m lengths. Providing 1m and 2m standardized modules, through combination, can meet any pile length design, significantly reducing inventory and production costs.

[0013] To address the issue of demolding damage caused by concrete adhering to the formwork, the present invention further specifically provides that, in the above technical solution, the inner surface of the eco-pile steel formwork system is coated with a release agent layer. This release agent layer forms a physical barrier, ensuring a smooth surface after demolding, reducing repair steps and improving yield.

[0014] To avoid quality risks such as leakage and misalignment of assembled end plates, the present invention further specifies that, in the above technical solution, both the pile body end plate and the pile head end plate utilize an integrally formed steel formwork. This integrally formed steel formwork eliminates joints, ensures geometric accuracy and sealing of the end plates, and enhances the strength of the pile body end.

[0015] In order to achieve efficient and standardized construction and ensure the quality of prestressed piles, the present invention also provides a construction method of an ecological pile steel formwork system, wherein the formwork system is configured to be suitable for prestressed construction using a pre-tensioning method, and comprises the following steps:

[0016] Step 1, template assembly: Place the basic module and base on the production line, select the pile end plate with or without pile tip, and the pile head end plate, insert the lower hanging steel plate into the double-jointed channel steel of the base and fix it. According to the design pile length requirements, connect the standard module behind the basic module. The basic module and the standard module are placed on the base through the limit plate at the bottom, and are connected and positioned horizontally by U-shaped pins. The upper part of the pile end plate is connected to the adjacent basic module or standard module through the U-shaped pin, and the upper part of the pile head end plate is connected to the adjacent basic module through the U-shaped pin. The lower part of the pile end plate or the pile head end plate is inserted into the double-jointed channel steel of the base;

[0017] Step 2: Apply the isolation agent: Apply the isolation agent evenly on the inner side of the ecological pile steel formwork system;

[0018] Step 3: Prestressed tendon installation and tensioning: Pass the prestressed tendons through the prestressed tendon holes on the pile end plate and the pile head end plate, and use tensioning equipment to tension the prestressed tendons to the specified design value;

[0019] Step 4: Rebar Binding: Open the side formwork through the hinges to expose the binding space, and bind the steel bar skeleton inside the side formwork according to the design requirements;

[0020] Step 5: Closing the formwork and reinforcing: After the reinforcement skeleton is tied, close the side formwork with hinges and insert U-shaped pins horizontally to connect the side formwork with the side formwork, and the side formwork with the pile end plate or the pile head end plate;

[0021] Step 6: Concrete pouring and vibration: Use a pump or bucket to pour concrete in layers from one end of the eco-pile steel formwork system to the other end. Use an inserted vibrator to vibrate and compact it, avoiding touching the prestressed tendons or the eco-pile steel formwork system.

[0022] Step 7, concrete curing: Cover with a moisture-retaining film, the curing period is ≥ 14 days, cover with a quilt for insulation when the temperature is below 5°C, and use steam to accelerate curing when the construction period is tight;

[0023] Step 8: Prestressing and end treatment: After the concrete strength reaches 75% to 80% of the design value, loosen the pedestal beam and use a jack to slowly and symmetrically release the prestressed tendons from the middle to both ends to prevent the pile from cracking. After release, remove the excess prestressed tendons and seal the concrete at the ends.

[0024] Step 9: Dismantle the mold: first remove the side mold, then remove the end mold;

[0025] Step 10: Quality inspection and repair: Check the appearance and size of the pile, repair surface defects with high-strength mortar, and stack the finished products after passing the inspection.

[0026] Fast and precise assembly is achieved through the interlocking positioning of the lower steel plate and double-jointed channel steel, and the horizontal connection using U-shaped latches. Symmetrical and slow tensioning prevents cracking, and a strength threshold of 75% to 80% ensures structural safety. The side formwork hinge design exposes space for tying, improving the efficiency of rebar skeleton construction. Steam curing shortens construction time.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. By decomposing the steel formwork into basic formwork and standard formwork, the traditional integral formwork can be replaced. A single set of formwork can produce sheet piles of different lengths, such as 3-10m, reducing mold costs by 60% and eliminating the need for customized full-length formwork.

[0029] Second, the use of assembled steel formwork has controllable dimensions, the pile body is formed in one piece, the forming precision is high, and the product quality is high;

[0030] 3. The side formwork and the bottom formwork are connected by hinges, and the side formwork and the side formwork, the side formwork and the pile end plate, and the side formwork and the pile head end plate are connected by positioning pins. The disassembly and assembly time of a single set of formwork is short, which greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic diagram of the basic module construction;

[0033] Figure 2 This is the basic module mold closing diagram Figure 1 ;

[0034] Figure 3 This is the basic module mold closing diagram Figure 2 ;

[0035] Figure 4 It is the construction diagram of basic module and standard module;

[0036] Figure 5 This is the schematic diagram of the basic module and standard module mold closing Figure 1 ;

[0037] Figure 6 This is the schematic diagram of the basic module and standard module mold closing Figure 2 ;

[0038] Figure 7 It is a structural diagram of the basic module;

[0039] Figure 8 It is a structural diagram of the base;

[0040] Figure 9 Schematic diagram of the structure of the basic module and the base assembly;

[0041] Figure 10 This is a schematic diagram of the pile end plate structure with pile tip;

[0042] Figure 11 This is a schematic diagram of the pile end plate structure without the pile tip;

[0043] Figure 12 It is a structural diagram of the pile head end plate;

[0044] Figure 13 This is the structural diagram of the side form in the basic module Figure 1 ;

[0045] Figure 14 yes Figure 13 Schematic diagram of the decomposition structure;

[0046] Figure 15 This is the structural diagram of the side form in the basic moduleFigure 2 ;

[0047] Figure 16 yes Figure 15 Schematic diagram of the decomposition structure;

[0048] Figure 17 It is a structural diagram of the bottom mold in the basic module;

[0049] Figure 18 It is a structural diagram of the standard module;

[0050] Figure 19 This is a partial structural diagram of the standard module;

[0051] Figure 20 This is the structural diagram of the side mold in the standard module Figure 1 ;

[0052] Figure 21 yes Figure 20 Schematic diagram of the decomposition structure;

[0053] Figure 22 This is the structural diagram of the side mold in the standard module Figure 2 ;

[0054] Figure 23 yes Figure 22 Schematic diagram of the decomposition structure.

[0055] The numbers in the figure are:

[0056] a. Foundation module; b. Base; c. Pile end plate; d. Pile head end plate; e. Standard module;

[0057] 1. Steel formwork with pile tip; 2. Positioning pin hole; 3. Square steel tube; 4. First U-shaped pin; 5. Side formwork; 6. Single-piece channel steel; 7. Prestressed tendon perforation; 8. Pile head steel formwork; 9. Eco-hole steel formwork; 10. Steel formwork without pile tip; 11. Bottom formwork; 12. Hinge; 13. Limit plate; 14. Double-piece channel steel; 15. Second U-shaped pin; 16. Lower hanging steel plate; 17. Convex formwork

[0058] 51. U-shaped steel plate; 52. Ribbed plate; 53. Curved steel plate. DETAILED DESCRIPTION

[0059] The embodiments of the present invention are described in detail below. The embodiments are implemented based on the technical solutions of the present invention, and detailed implementation methods and specific operating processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0060] See Figures 1-23 The present invention provides an ecological pile steel formwork system, comprising a foundation module a, a base b, a pile body end plate c and a pile head end plate d.

[0061] See Figure 7 The basic module a includes a bottom mold 11, side molds 5, and hinges 12. The bottom mold 11 and the side molds 5 are connected by the hinges 12. A male mold plate 17 is provided on the bottom mold 11. Specifically, there are two side molds 5, which are connected to both sides of the bottom mold 11 by the hinges 12. The male mold plate 17 is provided in the axial direction of the upper surface of the bottom mold 11 and close to one end of the bottom mold 11.

[0062] See Figure 8 The base b includes square steel tubes 3, single-piece channel steels 6, and double-piece channel steels 14, which are connected by welding. Specifically, the base b includes four square steel tubes 3, two single-piece channel steels 6, and two double-piece channel steels 14. The two single-piece channel steels 6 and the two double-piece channel steels 14 are arranged in parallel on the same plane. The two double-piece channel steels 14 are located outside the two single-piece channel steels 6. The four square steel tubes 3 are mounted on the two single-piece channel steels 6 and the two double-piece channel steels 14. The square steel tubes 3 are perpendicular to the single-piece channel steels 6, the square steel tubes 3 are perpendicular to the double-piece channel steels 14, and every two square steel tubes 3 are adjacent to the end of the channel steel.

[0063] Preferably, the size of the square steel tube 3 is 100×50×4 mm.

[0064] See Figure 10 and Figure 11 The pile end plate c includes at least one of a steel template with a pile tip 1 and a steel template without a pile tip 10.

[0065] See Figure 12 The pile head end plate d includes a pile head steel template 8 and an eco-hole steel template 9, and the eco-hole steel template 9 is arranged on the pile head steel template 8. Specifically, when the pile head end plate d is connected to the foundation module a, the eco-hole steel template 9 is located close to the foundation module a, and the pile head steel template 8 is located away from the foundation module a.

[0066] The basic module a and the base b are fixed by welding.

[0067] The foundation module a, the pile body end plate c and the pile head end plate d are connected transversely by U-shaped pins.

[0068] See Figure 10 、 Figure 11 and Figure 12 A lower hanging steel plate 16 is provided at the lower part of the pile body end plate c and the pile head end plate d, and the lower hanging steel plate 16 is inserted into the double-piece channel steel 14 of the base b for positioning.

[0069] Of course, the ecological pile steel formwork system can also include standard modules e.

[0070] See Figure 18The standard module e includes a base mold 11, side molds 5, hinges 12, and limit plates 13. The base mold 11 and side molds 5 are connected by hinges 12. The limit plates 13 are set at the bottom of the side molds 5. The standard module e is adjustable in length. Specifically, there are two side molds 5, which are connected to both sides of the base mold 11 by hinges 12.

[0071] The standard module e is placed on the base b via the limiting plate 13 at the bottom thereof.

[0072] The standard module e, the basic module a and the pile end plate c are connected transversely via U-shaped pins.

[0073] Specifically, the basic module a is connected to the standard module e via a U-shaped latch.

[0074] The upper part of the pile end plate c is connected to the basic module a or the standard module e through a U-shaped pin, and the lower part of the pile end plate c is inserted into the double-jointed channel steel 14 of the base b through the lower hanging steel plate 16.

[0075] The upper part of the pile head end plate d is connected to the basic module a through a U-shaped pin, and the lower part of the pile head end plate d is inserted into the double-jointed channel steel 14 of the base b through the lower hanging steel plate 16.

[0076] Specifically, the U-shaped latches include a first U-shaped latch 4 for connecting the side form 5 and a second U-shaped latch 15 for connecting the base b. The side form 5 is provided with a positioning latch hole 2 that mates with the first U-shaped latch 4. The dedicated latches (the first U-shaped latch 4 connecting the side form 5 and the second U-shaped latch 15 connecting the base b) and the positioning latch holes 2 enable modular and precise assembly, improving construction efficiency. Furthermore, the differentiated latch design prevents misoperation and ensures a stable connection between the base b and the side form 5.

[0077] Specifically, the side formwork 5 is composed of a composite assembly of U-shaped steel plates 51, ribbed plates 52, and curved steel plates 53. The U-shaped and ribbed plates 51 and 52 are made of Q355 steel plates with a thickness of 4 to 6 mm, while the curved plates 53 are made of Q245 steel plates with a thickness of 5 to 7 mm. The ribbed plates 52 are spaced 900 to 1100 mm apart. The U-shaped plates 51 provide support for the main structure, the curved plates 53 allow for curved surface forming, and the ribbed plates 52 enhance deformation resistance. High-strength Q355 steel plates are used in key stress-bearing areas, while low-cost Q245 steel plates are used for non-critical curved surfaces, achieving lightweight and cost-effectiveness.

[0078] See Figure 13 and Figure 14 The specific structure of the side mold 5 is: a number of ribbed plates 52 are welded and fixed on the inner arc surface of the arc-shaped steel plate 53 at equal intervals, and the arc-shaped steel plate 53 with a number of ribbed plates 52 is welded and fixed as a whole on the outer bottom of the U-shaped steel plate 51.

[0079] Or, see Figure 15and Figure 16 Another specific structural form of the side form 5 is: a plurality of ribbed plates 52 are welded and fixed at equal intervals to the outer curved surface of the curved steel plate 53, and the curved steel plate 53 with the ribbed plates 52 fixed thereto is integrally welded and fixed to the inner bottom of the U-shaped steel plate 51. Preferably, the thickness of the U-shaped steel plate 51 and the ribbed plates 52 is 5 mm, the thickness of the curved steel plate 53 is 6 mm, and the spacing between the ribbed plates 52 is 1000 mm.

[0080] Specifically, the single-piece channel steel 6 in base b is 5# channel steel, and the double-piece channel steel 14 is 5# channel steel. The use of 5# channel steel for both the single-piece channel steel 6 and the double-piece channel steel 14 in base b simplifies supply chain management and improves component interchangeability. At the same time, the double-piece channel steel 14 enhances the bearing capacity of base b, thereby ensuring the overall stability of the formwork system.

[0081] Specifically, the bottom mold 11 is made of Q355 steel plate with a thickness of 4 to 6 mm formed by shear folding. The Q355 steel plate formed by shear folding has high strength and forming precision, is resistant to concrete impact deformation, and significantly extends its service life.

[0082] Preferably, the thickness of the bottom mold 11 is 5 mm.

[0083] Specifically, both the pile body end plate c and the pile head end plate d are provided with prestressed tendon through-holes 7. By pre-setting the prestressed tendon through-holes 7, the tensioning process is ensured to be formed in one step, thus ensuring the structural integrity and positioning accuracy of the end plates.

[0084] Specifically, the standard module e is available in 1m and 2m lengths, which can be combined to meet pile length requirements. Providing standardized 1m and 2m modules allows for any pile length design, significantly reducing inventory and production costs.

[0085] Specifically, the inner surface of the eco-pile steel formwork system is coated with a release agent layer, which is a water-based release agent. This layer forms a physical barrier, ensuring a smooth surface after demoulding, reducing repair steps and improving the yield rate.

[0086] Specifically, both the pile end plate c and the pile head end plate d utilize one-piece steel formwork. This eliminates joints, ensures geometric accuracy and sealing at the ends, and enhances pile end strength.

[0087] The present invention provides a construction method for an ecological pile steel formwork system. The formwork system is configured to be suitable for prestressed construction using the pre-tensioning method. The lower hanging steel plate 16 is positioned and inserted into the double-jointed channel steel 14, and the U-shaped pins are used for horizontal connection to achieve fast and accurate assembly. Symmetrical and slow tensioning prevents cracking, and a strength threshold of 75% to 80% ensures structural safety. The side formwork hinge design exposes the binding space, improving the efficiency of steel skeleton construction. Steam curing shortens the construction period. Specifically, the following steps are included:

[0088] Step 1, template assembly: Place the basic module a and the base b, place the basic module a and the base b on the production line, select the pile end plate c with or without pile tip, and the pile head end plate d, insert the lower hanging steel plate 16 into the double-jointed channel steel 14 of the base b and fix it, according to the design pile length requirements, connect the standard module e behind the basic module a, the basic module a and the standard module e are placed on the base b through the limiting plate 13 at the bottom, and are connected and positioned horizontally by U-shaped pins, the upper part of the pile end plate c is connected to the adjacent basic module a or standard module e by a U-shaped pin, the upper part of the pile head end plate d is connected to the adjacent basic module a by a U-shaped pin, and the lower part of the pile end plate c or the pile head end plate d is inserted into the double-jointed channel steel 14 of the base b;

[0089] Step 2: Apply the isolation agent: Apply the isolation agent evenly on the inner side of the ecological pile steel formwork system to prevent the concrete from sticking;

[0090] Step 3: Prestressed tendon installation and tensioning: Pass the prestressed tendons through the prestressed tendon holes 7 on the pile end plate c and the pile head end plate d, and use tensioning equipment to tension the prestressed tendons to the design specified value;

[0091] Step 4: Rebar Binding: Open the side form 5 through the hinge 12 to expose the binding space, and bind the steel skeleton in the side form 5 according to the design requirements;

[0092] Step 5, closing the mold and reinforcing: After the reinforcement skeleton is tied, close the side mold 5 by the hinge 12, and insert the U-shaped pin horizontally to connect the side mold 5 with the side mold 5, the side mold 5 with the pile end plate c or the pile head end plate d to prevent the formation of expansion mold when pouring concrete to form a pile; specifically, the basic module a and the standard module e, the standard module e and the standard module e, the pile body end plate c and the standard module e, and the pile head end plate d and the basic module a are also connected by U-shaped pins.

[0093] Step 6: Concrete pouring and vibration: Use a pump or bucket to pour concrete in layers from one end of the eco-pile steel formwork system to the other. Use an inserted vibrator to compact the concrete and avoid touching the prestressed reinforcement or the eco-pile steel formwork system. During the pouring process, check the deformation of the eco-pile steel formwork system and make timely adjustments and reinforcements to prevent leakage or formwork movement.

[0094] Step 7, concrete curing: Concrete curing can be done in the following two ways: I. Natural curing: After pouring, cover with a moisture-retaining film for a curing period of 14 days or more. When the temperature is below 5°C, use insulation measures (such as covering with a quilt); II. If the construction period is tight, use steam accelerated curing;

[0095] Step 8: Prestressing and end treatment: After the concrete strength reaches 75% to 80% of the design value, loosen the pedestal beam and use a jack to slowly and symmetrically tension the prestressed tendons from the middle to both ends to prevent the pile from cracking. After tensioning, remove the excess prestressed tendons and seal the concrete at the ends, such as applying anti-rust paint.

[0096] Step 9, formwork removal: first remove the side formwork, then remove the end formwork, and avoid collision with the pile body during removal. Formwork removal strength requirements: I. When removing the side formwork 5, the concrete strength must be ≥15Mpa; II. When removing the bottom formwork 11, the pre-tensioning method needs to be removed after the prestressing is released;

[0097] Step 10: Quality inspection and repair: Check the appearance and size of the pile. Use high-strength mortar to repair or fill surface defects. After passing the inspection, the finished product will be protected and stacked.

[0098] The key innovations of the present invention are: ① The bottom formwork 11 and the side formwork 5 are connected by hinges 12: when the hinges 12 are open, it is convenient to tie the steel bars; when the hinges 12 are closed, concrete is poured; such a design can facilitate workers to tie the steel bars, and is also conducive to demoulding, and can be reused many times. ② The steel formwork is decomposed into a basic module a and a standard module e. The basic module a is a fixed module, and a convex formwork is attached to the bottom formwork 11. The standard module e is a movable module, and the length can be 1m / section, 2m / section, etc. There is no need to customize the entire length formwork. The standard module e and the basic module a are connected by positioning pins. By replacing the pile tip, ecological piles with pile heads can be made, and ecological piles without pile tips can also be produced.

[0099] An ecological sheet pile steel formwork system and a construction method thereof of the present invention include the following advantages: 1. By decomposing the steel formwork, it is divided into a basic formwork a and a standard formwork e, thereby replacing the traditional integral formwork, so that a single set of formwork can produce sheet piles of different lengths such as 3-10m, and the mold cost is reduced by 60%, and there is no need to customize the entire length formwork; 2. The use of assembled steel formwork has controllable dimensions, the pile body is integrally formed, the molding precision is high, and the product quality is high; 3. The side formwork 5 is connected to the bottom formwork 11 by a hinge 12, and the side formwork 5 and the side formwork 5, the side formwork 5 and the pile body end plate c, and the side formwork 5 and the pile head end plate d are connected by positioning pins. The disassembly and assembly time of a single set of formwork is short, which greatly improves production efficiency.

[0100] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An ecological pile steel formwork system, characterized by: It includes foundation module (a), base (b), pile end plate (c) and pile head end plate (d); The basic module (a) comprises a bottom mold (11), a side mold (5) and a hinge (12); the bottom mold (11) and the side mold (5) are connected via the hinge (12); a convex mold plate (17) is provided on the bottom mold (11); The base (b) comprises a square steel tube (3), a single-piece channel steel (6) and a double-piece channel steel (14), wherein the square steel tube (3), the single-piece channel steel (6) and the double-piece channel steel (14) are connected by welding; The pile end plate (c) includes at least one of a steel template with a pile tip (1) and a steel template without a pile tip (10); The pile head end plate (d) comprises a pile head steel template (8) and an ecological hole steel template (9), wherein the ecological hole steel template (9) is arranged on the pile head steel template (8); Wherein, the basic module (a) and the base (b) are fixed by welding; The basic module (a), the pile body end plate (c) and the pile head end plate (d) are connected transversely via U-shaped pins; A lower hanging steel plate (16) is provided at the lower part of the pile body end plate (c) and the pile head end plate (d), and the lower hanging steel plate (16) is inserted into the double-jointed channel steel (14) of the base (b) for positioning; The ecological pile steel formwork system also includes a standard module (e), The standard module (e) comprises a bottom mold (11), a side mold (5), a hinge (12) and a limit plate (13); the bottom mold (11) and the side mold (5) are connected via the hinge (12); the limit plate (13) is arranged at the bottom of the side mold (5); and the length of the standard module (e) is adjustable; The standard module (e) is placed on the base (b) via a limiting plate (13) at the bottom thereof; The standard module (e), the basic module (a) and the pile end plate (c) are connected transversely via U-shaped pins.

2. The ecological pile steel formwork system according to claim 1 is characterized by: The U-shaped latch comprises a first U-shaped latch (4) for connecting to the side mold (5) and a second U-shaped latch (15) for connecting to the base (b), and a positioning latch hole (2) is provided on the side mold (5) for matching with the first U-shaped latch (4).

3. The ecological pile steel formwork system according to claim 1 is characterized by: The side formwork (5) is formed by composite splicing of a U-shaped steel plate (51), a ribbed plate (52) and a curved steel plate (53); wherein the U-shaped steel plate (51) and the ribbed plate (52) are made of Q355 steel plates with a thickness of 4 to 6 mm, the curved steel plate (53) is made of Q245 steel plates with a thickness of 5 to 7 mm, and the spacing between the ribbed plates (52) is 900 to 1100 mm.

4. The ecological pile steel formwork system according to claim 1 is characterized by: The single-piece channel steel (6) in the base (b) is a 5# channel steel, and the double-piece channel steel (14) is a 5# channel steel.

5. The ecological pile steel formwork system according to claim 1 is characterized by: The bottom mold (11) is formed by shearing and folding and is made of Q355 steel plate with a thickness of 4 to 6 mm.

6. The ecological pile steel formwork system according to claim 1 is characterized by: Prestressed tendon through-holes (7) are provided on both the pile body end plate (c) and the pile head end plate (d).

7. The ecological pile steel formwork system according to claim 1 is characterized by: The length specifications of the standard module (e) include 1m and 2m.

8. The ecological pile steel formwork system according to claim 1 is characterized by: The inner surface of the ecological pile steel formwork system is coated with an isolation agent layer.

9. The ecological pile steel formwork system according to claim 1 is characterized by: The pile body end plate (c) and the pile head end plate (d) both adopt an integrally formed steel formwork.

10. A construction method of the ecological pile steel formwork system according to any one of claims 1 to 9, characterized in that: The formwork system is configured to be suitable for prestressed construction using a pre-tensioning method, including the following steps: Step 1, template assembly: placing the basic module (a) and the base (b) on the production line, selecting the pile end plate (c) with or without a pile tip, and the pile head end plate (d), inserting the lower hanging steel plate (16) into the double-jointed channel steel (14) of the base (b) for fixation, connecting the standard module (e) behind the basic module (a) according to the design pile length requirement, the basic module (a) and the standard module (e) are placed on the base (b) through the limiting plate (13) at the bottom, and are horizontally connected and positioned by U-shaped pins, the upper part of the pile end plate (c) is connected to the adjacent basic module (a) or standard module (e) by the U-shaped pin, the upper part of the pile head end plate (d) is connected to the adjacent basic module (a) by the U-shaped pin, and the lower part of the pile end plate (c) or the pile head end plate (d) is inserted into the double-jointed channel steel (14) of the base (b); Step 2: Apply the isolation agent: Apply the isolation agent evenly on the inner side of the ecological pile steel formwork system; Step 3: Prestressed tendon installation and tensioning: Pass the prestressed tendons through the prestressed tendon holes (7) on the pile end plate (c) and the pile head end plate (d), and use tensioning equipment to tension the prestressed tendons to the design specified value; Step 4, steel bar binding: open the side form (5) through the hinge (12) to expose the binding space, and bind the steel bar skeleton in the side form (5) according to the design requirements; Step 5, closing the mold and reinforcing: After the reinforcement skeleton is tied, close the side mold (5) through the hinge (12), and insert the U-shaped pin horizontally to connect the side mold (5) with the side mold (5), the side mold (5) and the pile end plate (c) or the pile head end plate (d); Step 6: Concrete pouring and vibration: Use a pump or bucket to pour concrete in layers from one end of the eco-pile steel formwork system to the other end. Use an inserted vibrator to vibrate and compact it, avoiding touching the prestressed tendons or the eco-pile steel formwork system. Step 7, concrete curing: Cover with a moisture-retaining film, the curing period is ≥ 14 days, cover with a quilt for insulation when the temperature is below 5°C, and use steam to accelerate curing when the construction period is tight; Step 8: Prestressing and end treatment: After the concrete strength reaches 75% to 80% of the design value, loosen the pedestal beam and use a jack to slowly and symmetrically release the prestressed tendons from the middle to both ends to prevent the pile from cracking. After release, remove the excess prestressed tendons and seal the concrete at the ends. Step 9: Dismantle the mold: first remove the side mold, then remove the end mold; Step 10: Quality inspection and repair: Check the appearance and size of the pile, repair surface defects with high-strength mortar, and stack the finished products after passing the inspection.

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