Modularized reconfigurable ecological pile steel formwork system and multi-pile-type construction method

Abstract

The invention discloses a modularized reconfigurable ecological pile steel formwork system and a multi-pile-type construction method. The modularized reconfigurable ecological pile steel formwork system comprises a reaction frame, connecting accessories, steel formwork modules and replaceable components. The counter-force frame is formed by connecting profile steel through bolts, ribbed plates and limiting pieces are arranged on the profile steel, and prestress penetrating holes are formed in the two ends of the counter-force frame. The connecting fitting is a U-shaped bolt; the steel template module comprises a base, a bottom die, a side die, a pile end steel template and a pile tip steel template; each side die is composed of a U-shaped steel plate, an arc-shaped steel plate and a rib plate. The pile end steel formworks comprise the first pile end steel formwork and the second pile end steel formwork. The base is formed by welding square steel tubes and channel steel; the bottom die is hinged with the side die through a hinge; the replaceable component comprises a bottom die cover plate, a first pile end steel template and a second pile end steel template. Wherein the bottom die cover plate covers the bottom die and is used for producing a common sheet pile; the pile end steel template I is used for producing a prestressed sheet pile; the second pile end steel formwork is used for producing common sheet piles. The device is simple in structure and very 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 a modular reconfigurable ecological pile steel template system and a multi-pile construction method. 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 due to its effective ability to improve 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. However, existing technologies present the following major challenges:

[0003] On the one hand, during the prestressed pre-tensioning construction process, it is necessary to rely on the tensioning pedestal to provide reaction support. The tensioning pedestal is mostly a fixed structure (such as pier-type pedestal, trough-type pedestal, etc.), which is fixed and installed through a rigid connection with the ground; when used for off-site production of sheet piles, this type of fixed pedestal has the problems of high construction cost, long construction period and lack of flexibility.

[0004] On the other hand, due to the special-shaped structures unique to ecological sheet piles (such as concave and convex tongue and groove, vegetation channels, etc.), the molding accuracy of existing templates is poor, resulting in the sheet pile splicing sealing and ecological functions being difficult to meet engineering design requirements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, a modular reconfigurable ecological pile steel formwork system and a multi-pile type construction method are provided, which have a simple structure and are very convenient to install and disassemble.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a modular reconfigurable ecological pile steel formwork system, including a reaction frame, connecting accessories, a steel formwork module and replaceable components; the reaction frame is composed of steel sections connected by bolts, and the steel sections are provided with ribbed plates and limiters, and prestressed through-holes are opened at both ends of the reaction frame; the connecting accessories are U-shaped pins, including U-shaped pin 1 and U-shaped pin 2; the steel formwork module includes a base, a bottom formwork, a side formwork, a pile end steel formwork and a pile tip steel formwork; the side formwork is composed of a U-shaped steel plate, a curved steel plate and a rib plate; the side formwork includes side formwork 1 and side formwork 2; The pile end steel formwork includes pile end steel formwork 1 and pile end steel formwork 2; the base is formed by welding square steel tubes and channel steels; the bottom formwork and side formwork are hinged by hinges; the pile tip steel formwork is connected to the side formwork by U-shaped pin 1; the upper part of the pile end steel formwork is connected to the side formwork by U-shaped pin 2, and the lower part is inserted into the double-jointed channel steel of the base through the lower hanging plate; the replaceable component includes a bottom formwork cover plate, pile end steel formwork 1 and pile end steel formwork 2; wherein, the bottom formwork cover plate is covered on the bottom formwork for producing ordinary sheet piles; the pile end steel formwork 1 is used to produce prestressed sheet piles; the pile end steel formwork 2 is used to produce ordinary sheet piles.

[0007] In order to solve the technical problems that the reaction frame is subjected to huge reaction force during prestressing, the web is prone to local buckling or shear deformation, and the non-equidistant arrangement may lead to uneven stress distribution and reduce the overall stability, the present invention further specifically stipulates that, in the above technical solution, several of the ribbed plates are arranged at equal intervals on the web of the steel section. The equidistant arrangement of the ribbed plates makes the force on the web of the reaction frame uniform, significantly improves the shear bearing capacity and anti-buckling capacity; avoids weld cracking or bolt loosening caused by local stress concentration, and extends the service life of the reaction frame; simplifies the manufacturing process, standardizes positioning, and reduces processing costs.

[0008] In order to solve the technical problems that the pile end steel formwork is prone to horizontal displacement under the side pressure of concrete, resulting in pile size deviation or leakage, and the technical problem that the traditional welding fixing method hinders the rapid replacement of the formwork, the present invention further specifically defines that, in the above technical solution, the double-piece channel steel of the base forms a guide groove for the insertion of the lower hanging plate, and the depth and width of the guide groove are set to allow the lower hanging plate to be smoothly inserted and limit its horizontal displacement. The guide groove provides precise positioning to ensure that the pile end formwork is vertically aligned with the base, thereby improving the geometric accuracy of the pile; the horizontal displacement constraint effectively resists the impact force of pouring and prevents mold expansion; the plug-in disassembly function is retained to maintain the reconfigurability of the system.

[0009] The present invention also provides a multi-pile type construction method based on a modular reconfigurable ecological pile steel formwork system, comprising the following steps: Step 1, assembling a reaction frame by bolts and placing it on a flat ground; Step 2, installing the base and side formwork of the steel formwork module by means of the limiting pieces on the reaction frame; Step 3, applying an isolation agent on the inner contact surface of the steel formwork module, wherein the contact surface includes the inner surface of the bottom formwork, the side formwork, the pile end steel formwork and the pile tip steel formwork; Step 4, opening the hinge to unfold the side formwork and tying the steel bars; Step 5, closing the formwork and locking the side formwork and the pile tip steel formwork by means of a U-shaped pin one, and locking the side formwork and the pile end steel formwork by means of a U-shaped pin two; Step 6, pouring concrete in layers and vibrating the concrete; Step 7, removing the formwork after the concrete is cured to the design strength.

[0010] Since if the steel bars are tied first and the prestressed bars are passed through later, technical problems such as deformation of the steel bar skeleton or entanglement of the prestressed bars may easily occur; and the tensioning operation space is limited, which affects the accuracy of tensioning force control. Therefore, the present invention further specifically stipulates that in the above technical solution, when producing prestressed sheet piles, before step 4, the following steps are performed: the prestressed steel strands are passed through the prestressed channels of the pile tip steel formwork and the pile end steel formwork, and tensioned to the set value; in step 7, the following steps are added: when the concrete strength reaches a specific strength range, the prestressed bars are symmetrically tensioned, the excess prestressed steel strands are cut off, and the exposed ends of the prestressed bars and the holes in the end faces of the concrete pile body are sealed to ensure that the prestressed bars pass through the channels in a straight line to avoid tensioning friction losses; an unobstructed operating space is provided for the tensioning equipment to ensure the accuracy of the tensioning value; the steel bars are tied after tensioning to avoid disturbing the tensioned bars.

[0011] Since ordinary piles do not require prestressed channels, retaining the holes will cause concrete to flow in, waste materials and affect the strength of the pile end; the bottom formwork is directly exposed and prone to wear, reducing the number of reuses; therefore, the present invention further specifically stipulates that in the above technical solution, when producing ordinary sheet piles, after step 2, the following steps are performed: covering the bottom formwork cover plate on the bottom formwork, and sealing the prestressed channels of the pile end steel formwork 2; in step 7, add: when the concrete strength reaches specific requirements, directly remove the formwork, seal the channels to avoid concrete leakage, and ensure the integrity of the pile end; the bottom formwork cover plate protects the bottom formwork surface and extends the life of key components; production line switching is achieved through simple covering or blocking, highlighting the reconfigurable advantage.

[0012] Since vibration touching the prestressed tendons may cause damage to the protective layer and cause rust hazards; directly vibrating the formwork may cause the bolts to loosen or the hinges to deform. Therefore, the present invention further specifically stipulates that in the above technical solution, in step 6, the vibration is carried out using an inserted vibrator, and the vibrator does not contact the prestressed steel strands or the formwork, thereby protecting the prestressed tendon anti-corrosion layer and ensuring the durability of the pile body; maintaining the accuracy of the formwork connectors to avoid an increase in the assembly gap due to vibration.

[0013] Since ecological piles are often used in hydraulic environments, insufficient maintenance can easily lead to temperature cracks; traditional watering maintenance is inefficient and relies on manual labor. The present invention further specifically stipulates that in the above technical solution, in step 7, the concrete maintenance is natural maintenance: after pouring is completed, it is covered with a moisture-retaining film, and when the maintenance period reaches a set number of days and the temperature is lower than the set threshold, it is covered with insulation material; the moisture-retaining film and the low-temperature insulation solution inhibit water evaporation and temperature stress, and improve crack resistance.

[0014] The present invention further specifically defines that, in the above technical solution, in step 7, the concrete curing is steam curing, and steam curing accelerates demoulding and improves the turnover rate of the production line.

[0015] If the end formwork is removed first, the pile body will be easily damaged without lateral support; there will be shrinkage stress after the prestressed pile is released, and disorderly formwork removal may cause corner collapse. Therefore, the present invention further specifically stipulates that in the above technical solution, in step 7, the order of formwork removal is: first remove the U-shaped pin 1 and U-shaped pin 2 on the side formwork, and then remove the pile end steel formwork and the pile tip steel formwork. After the side formwork is removed, the concrete shrinkage stress is released to avoid the end formwork from getting stuck; the integrity of the pile body edges and corners is protected, and the repair cost is reduced; and the structure state of the prestressed pile after the stress is released is adapted.

[0016] The beneficial effects of the present invention are as follows: a modular reconfigurable ecological pile steel formwork system and a multi-pile construction method of the present invention specifically include the following advantages:

[0017] 1. The combination of reaction frame and different steel formwork modules enables fast installation and high flexibility;

[0018] 2. The reaction frame is combined with different steel formwork modules. By adding bottom formwork cover plates, end plates and other components to the steel formwork modules, different ecological sheet pile products can be produced;

[0019] 3. 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;

[0020] 4. The side formwork and the bottom formwork are connected by hinges, and the side formwork and the side formwork and the 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.

[0021] 5. In the steel formwork module, the bottom formwork and the side formwork are connected by hinges: when the hinges are open, it is convenient to tie the steel bars; when the hinges are closed, concrete pouring can be carried out. This design makes it easier for workers to tie the steel bars, facilitates demoulding, and can be reused multiple times.

[0022] 6. Prestressed perforations are opened in the reaction frame, which can be used for prestressed tension or non-tension, to produce prestressed ecological sheet piles and ordinary sheet piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 Schematic diagram of the construction of prestressed sheet piles in the present invention;

[0025] Figure 2 It is a schematic structural diagram of the prestressed sheet pile in the present invention;

[0026] Figure 3 This is a schematic diagram of the construction of ordinary sheet piles in the present invention;

[0027] Figure 4 It is a schematic structural diagram of a common sheet pile in the present invention;

[0028] Figure 5 It is a structural schematic diagram of the reaction frame in the present invention;

[0029] Figure 6 It is a structural schematic diagram of the base in the present invention;

[0030] Figure 7 It is a structural schematic diagram of the side mold 1 in the present invention;

[0031] Figure 8 yes Figure 7 Schematic diagram of the decomposition structure;

[0032] Figure 9 It is a structural diagram of the side mold 2 in the present invention;

[0033] Figure 10 yes Figure 9 Schematic diagram of the decomposition structure;

[0034] Figure 11 This is a schematic structural diagram of a pile end steel formwork for producing prestressed sheet piles in the present invention;

[0035] Figure 12 This is a schematic structural diagram of the second pile end steel formwork for producing ordinary sheet piles in the present invention;

[0036] Figure 13 It is a structural diagram of the pile tip steel template in the present invention;

[0037] Figure 14 It is a structural schematic diagram of the bottom mold of the present invention;

[0038] Figure 15 This is a schematic diagram of the bottom mold cover plate covering the bottom mold in the present invention. Figure 1 ;

[0039] Figure 16 This is a schematic diagram of the bottom mold cover plate covering the bottom mold in the present invention. Figure 2 .

[0040] The numbers in the figure are:

[0041] a. Reaction frame; b. Prestressed sheet pile; c. Ordinary sheet pile;

[0042] 1. Steel section; 2. Ribbed plate; 3. Limiting piece; 4. Prestressed perforation; 5. Bolt; 6. Pile tip steel formwork; 7. Square steel tube; 8. U-shaped pin (1); 9. Side formwork (1); 10. U-shaped pin (2); 11. Pile end steel formwork (1); 12. Side formwork (2); 13. Channel steel; 15. Bottom formwork cover; 16. Pile end steel formwork (2); 17. Prestressed steel strand; 18. Lower plug plate; 19. Eco-hole steel formwork (1); 20. Hinge; 21. Bottom formwork; 22. Eco-hole steel formwork (2); 121. U-shaped steel plate; 122. Curved steel plate; 123. Rib plate. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] See Figure 1-16 The present invention provides a modular reconfigurable ecological pile steel formwork system, which is combined with different steel formworks through a reaction frame a. First, by changing some steel components in the steel formwork, such as the bottom formwork steel plate, the pile end steel formwork, etc., and second, whether to perform tensioning of the prestressed steel strand 17, different ecological sheet piles can be produced.

[0045] The modular reconfigurable ecological pile steel formwork system includes a reaction frame a, connecting accessories, steel formwork modules and replaceable components. The steel formwork modules are installed through the limiter 3 in the reaction frame a.

[0046] Among them, the reaction frame a is composed of steel sections 1 connected by bolts 5, and the steel sections 1 are provided with ribbed plates 2 and limiters 3, and prestressed through-holes 4 are opened at both ends of the reaction frame a. Specifically, the reaction frame a is connected by bolts 5 using steel sections 1, and the steel sections 1 are locally provided with ribbed plates 2 to enhance the local or overall mechanical properties of the structure, improve its bearing capacity, rigidity and stability, and prevent the components from becoming unstable or damaged due to excessive local force or excessive deformation. Preferably, the model of the steel section 1 of the reaction frame a is 400×400×13×21. More specifically, the reaction frame a is composed of four steel sections 1 connected by bolts 5 to form a U-shaped structure; two of the relatively distributed steel sections 1 have their webs arranged horizontally; and the other two relatively distributed steel sections 1 have their webs arranged vertically.

[0047] The connecting accessories are U-shaped latches, including a U-shaped latch 1 8 and a U-shaped latch 2 10 .

[0048] The steel formwork module includes a base, a bottom formwork 21, a side formwork, a pile end steel formwork and a pile tip steel formwork 6. The side formwork includes a side formwork 1 9 and a side formwork 2 12. The pile end steel formwork includes a pile end steel formwork 1 11 and a pile end steel formwork 2 16. The base is formed by welding a square steel tube 7 to a channel steel 13. The bottom formwork 21 and the side formwork are hinged by a hinge 20. The pile tip steel formwork 6 is connected to the side formwork by a U-shaped latch 1 8. The upper part of the pile end steel formwork is connected to the side formwork by a U-shaped latch 2 10, and the lower part is inserted into the double-jointed channel steel 13 of the base through the lower hanging plate 18. Preferably, the double-jointed channel steel 13 of the base forms a guide groove for inserting the lower hanging plate 18, and the depth and width of the guide groove are set to allow the lower hanging plate 18 to be smoothly inserted and limit its horizontal displacement. Preferably, the depth of the guide groove is greater than 1 / 2 of the height of the lower hanging plate 18, and the width is 0.5-1 mm larger than the thickness of the lower hanging plate 18.

[0049] Specifically, the steel formwork module is composed of a base, a bottom formwork 21, a side formwork, a pile end steel formwork, and a pile tip steel formwork 6. The base is composed of a square steel tube 7 and a channel steel 13. The square steel tube 7 is connected to the channel steel 13 by welding. The bottom formwork 21 is connected to the side formwork by a hinge 20. The pile tip steel formwork 6 is connected to the side formwork by a U-shaped pin 18. The upper part of the pile end steel formwork is connected to the side formwork by a U-shaped pin 2 10, and the lower part is inserted into the double-jointed channel steel 13 of the base through the steel formwork lower hanging plate 18. The side formwork in the ecological pile steel formwork module is composed of a U-shaped steel plate 121, an arc-shaped steel plate 122, and a rib plate 123. Specifically,

[0050] The side mold 9 is composed of a U-shaped steel plate 121, a curved steel plate 122 and a plurality of ribs 123. The ribs 123 are welded and fixed on the outer curved surface of the curved steel plate 122 at equal intervals. The curved steel plate 122 with the ribs 123 fixed thereon is welded and fixed as a whole on the inner bottom of the U-shaped steel plate 121.

[0051] The side mold 2 12 is composed of a U-shaped steel plate 121, a curved steel plate 122 and a plurality of ribs 123. The plurality of ribs 123 are welded and fixed on the inner curved surface of the curved steel plate 122 at equal intervals. The curved steel plate 122 with the plurality of ribs 123 fixed thereon is welded and fixed as a whole on the outer bottom of the U-shaped steel plate 121.

[0052] Further, specifically, the base is composed of several single-piece channel steels 13, several double-piece channel steels 13 and several square steel pipes 7. The several single-piece channel steels 13 and several double-piece channel steels 13 are distributed at intervals, and the several square steel pipes 7 are vertically welded and fixed on the upper surfaces of the several single-piece channel steels 13 and several double-piece channel steels 13.

[0053] Preferably, the U-shaped steel plates 121 and ribs 123 are made of Q355 steel with a thickness of 5 mm, the curved steel plates 122 are made of Q245 steel with a thickness of 6 mm, and the spacing between the ribs 123 is 1000 mm. The square steel tubes 7 in the base are 100 × 50 × 4 mm, and the channel steel 13 in the base is 5#. The bottom mold 21 is made of Q355 steel plate with a thickness of 5 mm, which is cut and folded.

[0054] The replaceable components include a bottom formwork cover plate 15 , a pile end steel formwork 1 11 and a pile end steel formwork 2 16 .

[0055] The bottom mold cover plate 15 covers the bottom mold 21 for producing ordinary sheet piles c.

[0056] Pile end steel formwork 11 is used to produce prestressed sheet piles b.

[0057] Pile end steel formwork 216 is used to produce ordinary sheet pile c.

[0058] Preferably, a plurality of ribbed plates 2 are arranged at equal intervals on the web of the section steel 1 .

[0059] Preferably, the steel section 1 is an H-shaped steel section.

[0060] The ecological pile steel formwork system of the present invention also includes an ecological hole steel formwork 19 and an ecological hole steel formwork 22. The ecological hole steel formwork 19 is arranged on the pile end steel formwork 11, and the ecological hole steel formwork 22 is arranged on the bottom formwork 21.

[0061] The present invention also provides a multi-pile type construction method based on a modular reconfigurable ecological pile steel formwork system, comprising the following steps:

[0062] Step 1: Assemble the reaction frame a with bolts 5 and place it on a flat surface.

[0063] Step 2: Install the base and side formwork of the steel formwork module through the limiter 3 on the reaction frame a.

[0064] Step 3: Apply a release agent to the inner contact surface of the steel formwork module, which includes the inner surfaces of the bottom formwork 21, the side formwork, the pile end steel formwork and the pile tip steel formwork 6.

[0065] Step 4: Open hinge 20, unfold the side formwork, and tie the steel bars.

[0066] Step 5: Close the mold and lock the side mold and the pile tip steel template 6 through the U-shaped pin 1 8, and lock the side mold and the pile end steel template through the U-shaped pin 2 10.

[0067] Step 6: pour concrete in layers and vibrate; preferably, an insert vibrator is used for vibration, and the vibrator does not contact the prestressed steel strand 17 or the formwork. Specifically, the vibrator maintains a distance of not less than 50 mm from the prestressed steel strand 17.

[0068] Step 7: After the concrete has cured to its designed strength, the formwork is removed. Preferably, the concrete is naturally cured. After pouring, a moisture-retaining film is applied. When the curing period reaches a set number of days (≥14 days) and the temperature falls below a set threshold of 5°C, insulation material is applied. Steam curing is used for concrete curing. The order for removing the formwork is as follows: first, remove the U-shaped latch 1 8 and U-shaped latch 2 10 on the side formwork, then remove the pile end steel formwork and pile tip steel formwork 6.

[0069] Among them, when producing prestressed sheet piles b, before step 4, the following steps are performed: the prestressed steel strand 17 is passed through the prestressed channels of the pile tip steel formwork 6 and the pile end steel formwork 11, and is tensioned to the set value; in step 7, the following steps are added: when the concrete strength reaches 75% to 80% of the specific strength range, the prestressed tendons are symmetrically tensioned, the excess prestressed steel strands 17 are cut off, and the exposed ends of the prestressed tendons and the end holes of the concrete pile body are sealed.

[0070] When producing ordinary sheet piles c, after step 2, the following steps are performed: covering the bottom formwork cover plate 15 on the bottom formwork 21 and sealing the prestressed duct of the pile end steel formwork 2 16; and adding in step 7: when the concrete strength reaches the specific requirement ≥ 70%, directly remove the formwork.

[0071] Example 1

[0072] The construction method of the present invention for prestressed sheet pile b is as follows: the reaction frame a is connected by bolts 5 and placed on the flat ground; the steel formwork module is installed in the corresponding position through the limiter 3 of the reaction frame a; an isolation agent (such as a water-based release agent) is applied to the inner contact surface of the steel formwork module to prevent concrete from sticking; the prestressed tendons are passed through the prestressed tendon holes on the pile tip steel formwork 6 and the pile end steel formwork, and are tensioned to a specified value; the side formwork is opened by the hinge 20, and the steel bars are tied according to the design requirements; after the steel bars are tied, the mold is closed by the hinge 20, and the U-shaped pins are connected horizontally to prevent When pouring concrete into piles, an expansion form is formed, and the pile tip steel formwork 6 and the pile end steel formwork are connected to the side formwork with U-shaped pins; pumping or bucket pouring is adopted, and the concrete is poured in layers from one end of the formwork to the other end. An inserted vibrator is used for vibration to avoid touching the prestressed tendons or formwork; during the pouring process, the deformation of the formwork is checked, and timely adjustments and reinforcements are made to prevent leakage or formwork movement; concrete curing can be carried out as follows: when the construction period is ample, the concrete is naturally cured, and after pouring is completed, it is covered with a moisture-retaining film. The curing period is ≥14 days, and insulation measures (such as covering with quilts) are adopted when the temperature is below 5°C; when the construction period is tight, the concrete is steam cured. After the concrete strength reaches 75% to 80% of the design value, the prestressed tendons are slowly tensioned by jacks, and the tensioning sequence is symmetrical from the middle to both ends to avoid cracking of the pile body. After tensioning, the excess prestressed tendons are cut off and the end concrete is sealed (such as applying anti-rust paint); the side formwork is removed first, and then the end formwork, and collision with the pile body is avoided during removal; quality inspection is carried out, and high-strength mortar is used to repair external defects. After passing the inspection, the finished products are protected and stacked.

[0073] Example 2

[0074] The construction method of the present invention for ordinary sheet piles c is as follows: the reaction frame a is connected by bolts 5 and placed on the flat ground; the steel formwork module is installed in the corresponding position through the limiter 3 of the reaction frame a, and the bottom formwork cover 15 is covered on the bottom formwork; an isolation agent (such as a water-based release agent) is applied to the inner contact surface of the steel formwork module to prevent concrete from sticking; the prestressed reinforcement perforations are blocked, the side formwork is opened by hinges 20, and the steel bars are tied according to the design requirements; after the steel bars are tied, the formwork is closed by hinges 20, and the U-shaped pins are used to connect horizontally to prevent the formation of expansion molds when pouring concrete into piles. The pile tip steel formwork 6 and the pile end steel formwork are connected to the side formwork by U-shaped pins; pumping or bucket casting is adopted, and the concrete is poured from the formwork Pour in layers from one end to the other, and use an inserted vibrator to avoid touching the prestressed tendons or formwork; check the deformation of the formwork during pouring, and adjust and reinforce it in time to prevent leakage or formwork running; concrete curing can be adopted: when the construction period is ample, the concrete is naturally cured: after pouring, cover with a moisture-retaining film, and the curing period is ≥14 days. When the temperature is below 5°C, insulation measures (such as covering with a quilt) are adopted; when the construction period is tight, the concrete is steam-cured; after the concrete strength reaches more than 70% of the design value, the formwork is removed; remove the side formwork first, and then remove the end formwork, and avoid colliding with the pile body during removal; carry out quality inspection, and the repair of appearance defects requires high-strength mortar to fill and level. After passing the inspection, the finished product is protected and stacked.

[0075] 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. A modular reconfigurable ecological pile steel formwork system, characterized by: It includes a reaction frame (a), connecting accessories, steel formwork modules and replaceable components; The reaction frame (a) is composed of steel sections (1) connected by bolts (5), and the steel sections (1) are provided with ribbed plates (2) and position limiting members (3), and both ends of the reaction frame (a) are provided with prestressed through holes (4); The connecting fitting is a U-shaped latch, comprising a U-shaped latch 1 (8) and a U-shaped latch 2 (10); The steel formwork module comprises a base, a bottom formwork (21), a side formwork, a pile end steel formwork and a pile tip steel formwork (6); The side mold is composed of a U-shaped steel plate (121), an arc-shaped steel plate (122) and a rib plate (123); The side mold includes a side mold 1 (9) and a side mold 2 (12); The pile end steel formwork comprises a pile end steel formwork 1 (11) and a pile end steel formwork 2 (16); The base is formed by welding a square steel tube (7) and a channel steel (13); The bottom mold (21) and the side mold are hinged via hinges (20); The pile tip steel template (6) is connected to the side template via a U-shaped latch (8); The upper part of the pile end steel template is connected to the side template through U-shaped pin 2 (10), and the lower part is inserted into the double-jointed channel steel (13) of the base through the lower hanging plate (18); The replaceable components include a bottom formwork cover plate (15), a pile end steel formwork 1 (11) and a pile end steel formwork 2 (16); wherein the bottom mold cover plate (15) is covered on the bottom mold (21) for producing ordinary sheet piles (c); The pile end steel formwork 1 (11) is used to produce prestressed sheet piles (b); The second pile end steel formwork (16) is used to produce ordinary sheet piles (c).

2. The modular reconfigurable ecological pile steel formwork system according to claim 1 is characterized by: A plurality of ribbed plates (2) are arranged at equal intervals on the web of the section steel (1).

3. The modular reconfigurable ecological pile steel formwork system according to claim 1 is characterized by: The double-jointed channel steel (13) of the base forms a guide groove for inserting the lower hanging plate (18), and the depth and width of the guide groove are set to allow the lower hanging plate (18) to be smoothly inserted and limit its horizontal displacement.

4. A multi-pile construction method based on the modular reconfigurable ecological pile steel formwork system according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Assemble the reaction frame (a) with bolts (5) and place it on a flat surface; Step 2: Install the base and side formwork of the steel formwork module through the limiter (3) on the reaction frame (a); Step 3: Applying a release agent to the inner contact surface of the steel formwork module, wherein the contact surface includes the inner surface of the bottom formwork (21), the side formwork, the pile end steel formwork, and the pile tip steel formwork (6); Step 4: Open the hinge (20), unfold the side formwork, and tie the steel bars; Step 5: close the mold and lock the side mold and the pile tip steel mold (6) through the U-shaped latch 1 (8), and lock the side mold and the pile end steel mold through the U-shaped latch 2 (10); Step 6: Pour concrete in layers and vibrate; Step 7: Remove the formwork after the concrete has cured to the designed strength.

5. The multi-pile construction method according to claim 4, characterized in that: When producing prestressed sheet piles (b), Before step 4, the following steps are performed: passing the prestressed steel strand (17) through the prestressed holes of the pile tip steel template (6) and the pile end steel template (11), and tensioning the prestressed steel strand to a set value; Add in step 7: When the concrete strength reaches a specific strength range, the prestressed tendons are symmetrically stretched, the excess prestressed steel strands (17) are cut off, and the exposed ends of the prestressed tendons and the holes in the end faces of the concrete pile are sealed.

6. The multi-pile construction method according to claim 4, characterized in that: When producing ordinary sheet piles (c), After step 2, the following steps are performed: covering the bottom formwork cover plate (15) on the bottom formwork (21) and sealing the prestressed channel of the second pile end steel formwork (16); Added in step 7: When the concrete strength reaches the specific requirement, remove the formwork directly.

7. The multi-pile construction method according to claim 4, characterized in that: In step 6, the vibrating is performed using an inserted vibrator, and the vibrator does not contact the prestressed steel strands (17) or the formwork.

8. The multi-pile construction method according to claim 4, characterized in that: In step 7, the concrete curing is natural curing: after pouring is completed, it is covered with a moisture-retaining film, and when the curing period reaches a set number of days and the temperature is lower than a set threshold, it is covered with a thermal insulation material.

9. The multi-pile construction method according to claim 4, characterized in that: In step 7, the concrete curing is steam curing.

10. The multi-pile construction method according to claim 4, wherein: In step 7, the order of removing the formwork is: first remove the U-shaped latch 1 (8) and the U-shaped latch 2 (10) on the side formwork, and then remove the pile end steel formwork and the pile tip steel formwork (6).

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