A reusable formwork system and construction method for precast concrete tower

Abstract

The present invention provides a reusable formwork system and construction method for a precast concrete tower, comprising an inner formwork keel, an outer formwork keel, a bottom formwork, an inner formwork modified moon pressure plate and an outer formwork modified moon pressure plate, the outer formwork keel is arranged at the outer periphery of the inner formwork keel and the two are fixedly connected, the outer side of the inner formwork keel is fixedly provided with an inner formwork panel, the inner side of the outer formwork keel is fixedly provided with an outer formwork panel, the bottom formwork is arranged between the inner formwork panel and the outer formwork panel, and the inner formwork panel, the outer formwork panel and the bottom formwork form a casting space; the inner formwork modified moon pressure plate is arranged between the inner formwork keel and the inner formwork panel, and the outer formwork modified moon pressure plate is arranged between the outer formwork keel and the outer formwork panel. The present invention enables a set of formworks to be used for prefabrication of multiple ring segments of different sizes, thereby shortening the formwork customization period, improving the formwork use efficiency, and saving formwork costs.

Description

Technical Field

[0001] The invention belongs to the technical field of tower construction, and in particular relates to a reusable template system and a construction method for a precast concrete tower. Background Art

[0002] As the capacity of onshore wind turbines increases, the common steel towers are now adapted to the trend of higher hub installation heights. When the hub height exceeds 120m, the steel tower diameter is limited by the width limit of road transportation and the tower thickness is limited by the rolling process, making it very difficult to increase the stiffness. In recent years, production accidents caused by insufficient steel tower stiffness have occurred repeatedly. Concrete-steel hybrid towers are currently an effective solution to solve the problem of insufficient steel tower stiffness, increase hub height, and thus increase the capacity of single units. There are successful cases both at home and abroad.

[0003] Hybrid towers are generally made by replacing the steel tower with a diameter greater than 4.5m with precast concrete. The concrete section is composed of several precast rings, each of which is composed of several ring segments. The ring segments are generally precast in the factory, transported to the site, assembled into rings, and then hoisted and installed into a tower.

[0004] However, since the concrete tower tube needs to be cast in sections, each section requires a formwork. Therefore, a large number of formworks are prefabricated in the factory, a large amount of steel is used and the corresponding prefabrication time is long. Especially for projects with tight schedule requirements, it is impossible to complete them within the required schedule. Summary of the invention

[0005] The purpose of the present invention is to provide a reusable formwork system for a precast concrete tower, so as to overcome the above-mentioned technical problems existing in the prior art.

[0006] Another object of the present invention is to provide a construction method for a precast concrete tower in an onshore wind farm, which can greatly shorten the construction period.

[0007] To this end, the technical solution provided by the present invention is as follows:

[0008] A reusable formwork system for a precast concrete tower, comprising an inner formwork keel, an outer formwork keel, a bottom formwork, an inner formwork modified moon plate and an outer formwork modified moon plate, wherein the outer formwork keel is arranged at the outer periphery of the inner formwork keel and the two are fixedly connected, an inner formwork panel is fixedly arranged on the outer side of the inner formwork keel, an outer formwork panel is fixedly arranged on the inner side of the outer formwork keel, the bottom formwork is arranged between the inner formwork panel and the outer formwork panel, and the inner formwork panel, the outer formwork panel and the bottom formwork form a casting space;

[0009] The inner mold modified moon pressure plate is arranged between the inner mold keel and the inner mold panel, and the outer mold modified moon pressure plate is arranged between the outer mold keel and the outer mold panel. The inner mold modified moon pressure plate and the outer mold modified moon pressure plate both include a series of size moon pressure plates.

[0010] The outer mold modified moon pressure plate is thin in the middle and thick on both sides, and the outer arc radius is equal to the inner diameter of the outer mold panel.

[0011] The inner mold modified moon pressure plate is thick in the middle and thin on both sides, and the inner arc radius is equal to the outer diameter of the inner mold panel.

[0012] The inner panel and the outer panel are both two-layer panels, the inner panel is composed of a plurality of strip panels laid longitudinally, and the outer panel is laid transversely, and the inner panel and the outer panel are fixedly connected.

[0013] The inner mold keel and the outer mold keel are both composed of a plurality of horizontal arc steel plates and vertical steel sections, and the vertical steel sections are fixed between the horizontal arc steel plates.

[0014] The outer mold keel and the inner mold keel are connected by tension bolts.

[0015] The inner panel is fixedly connected to the inner mold keel or the outer mold keel, and the outer panel is fixed to the inner layer panel by nailing.

[0016] A construction method for a precast concrete tower of an onshore wind farm adopts a reusable formwork system of a precast concrete tower, and concrete is poured on each concrete tower section in a sequence from bottom to top, wherein each adjacent m tower sections share a set of inner formwork keels and outer formwork keels, and after the pouring construction of the first tower section is completed, the formwork is removed, and the inner formwork keel and the outer formwork keel are respectively modified by an inner formwork modification moon pressure plate and an outer formwork modification moon pressure plate, so that the sizes of the outer formwork panel and the inner formwork panel are respectively consistent with the outer wall radius and the inner wall radius of the second tower section, and after the modification is completed, the second tower section is poured, and then the formwork is removed, and the inner formwork modification moon pressure plate and the outer formwork modification moon pressure plate are again modified to make the formed formwork consistent with the size of the third tower section, and after the modification is completed, the third tower section is finally poured, and after the modification is sequentially modified, the pouring of m tower sections is completed.

[0017] When the inner mold keel is modified by the inner mold modified moon pressure plate, the inner mold panel is first removed, and then inner mold modified moon pressure plates of different sizes are welded layer by layer on the outside of the inner mold keel, so that the inner arc radius of the innermost inner mold modified moon pressure plate is consistent with the outer arc radius of the inner mold keel, and the difference between the outer arc radius of the outermost inner mold modified moon pressure plate and the thickness of the inner mold panel is the inner wall radius of the tower section.

[0018] The beneficial effects of the present invention are:

[0019] The reusable formwork system for the precast concrete tower provided by the present invention modifies the inner form keel and the outer form keel respectively by modifying the inner form with a moon pressure plate and the outer form with a moon pressure plate, so that the sizes of the outer form panel and the inner form panel are respectively consistent with the outer wall radius and the inner wall radius of the construction tower section, so that a set of formwork can be used for prefabrication of multiple ring segments of different sizes, thereby shortening the formwork customization period, improving the use efficiency of the formwork, and saving the formwork cost.

[0020] The following will provide a further detailed description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present invention;

[0022] Figure 2 is a plan view of an embodiment of the present invention;

[0023] Figure 3 This is the schematic diagram of the inner mold modified moon pressure plate modified inner mold keel arc plate;

[0024] Figure 4 This is the schematic diagram of the outer mold modified into a moon pressure plate and then modified into an outer mold keel arc plate.

[0025] In the figure: 1. Inner mold keel; 2. Outer mold keel; 3. Tension bolts; 4. Bottom template; 101. Horizontal arc plate of inner mold keel; 102. Vertical steel of inner mold keel; 103. Inner mold panel; 104. Inner mold modified crescent plate; 201. Horizontal arc plate of outer mold keel; 202. Vertical steel of outer mold keel; 203. Outer mold panel; 204. Outer mold modified crescent plate. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] The exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0028] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0029] Embodiment 1:

[0030] The present embodiment provides a reusable formwork system for a precast concrete tower, comprising an inner formwork keel 1, an outer formwork keel 2, a bottom formwork 4, an inner formwork modified crescent plate 104 and an outer formwork modified crescent plate 204, wherein the outer formwork keel 2 is arranged at the outer periphery of the inner formwork keel 1 and the two are fixedly connected, an inner formwork panel 103 is fixedly arranged on the outer side of the inner formwork keel 1, an outer formwork panel 203 is fixedly arranged on the inner side of the outer formwork keel 2, the bottom formwork 4 is arranged between the inner formwork panel 103 and the outer formwork panel 203, and the inner formwork panel 103, the outer formwork panel 203 and the bottom formwork 4 form a casting space;

[0031] The inner mold modified crescent plate 104 is arranged between the inner mold keel 1 and the inner mold panel 103, and the outer mold modified crescent plate 204 is arranged between the outer mold keel 2 and the outer mold panel 203. The inner mold modified crescent plate 104 and the outer mold modified crescent plate 204 both include a series of size crescent plates.

[0032] Usage process:

[0033] The number of ring sections n is determined according to the size of the precast concrete tower, and the number of templates to be prefabricated is calculated based on the use of one set of templates per m (m not less than 2) ring sections. If the number is less than one set, it will be calculated as one set. The inner formwork keel 1 and the outer formwork keel 2 are pre-assembled and welded in the factory and anti-corrosion treatment is performed.

[0034] This embodiment takes the first three ring segments as an example to describe the use process of the template system: First, before the construction of the first ring segment, the inner mold panel 103 is fixed on the outer side of the inner mold keel 1 to form an inner mold, and the outer mold panel 203 is fixed on the inner side of the outer mold keel 2 to form an outer mold, and a mold release agent is applied to the surface respectively, and then assembled with the bottom template 4 to form a template, such as Figure 1 , Figure 2 As shown, finally concrete is poured to complete the construction of the first ring section.

[0035] After the construction of the first ring segment is completed, the mold is removed, the inner mold and the outer mold are separated, and the outer mold keel 2 and the inner mold keel 1 are modified respectively. When modifying, the inner mold template is first removed, and then according to the size of the second ring segment, the size of the inner mold keel 1 is adjusted by using several sizes of inner mold modified crescent plates 104 corresponding to the size. After the size is adjusted, several inner mold modified crescent plates 104 are welded to the outer arc of the inner mold keel 1 at a time, and finally the inner mold template is fixed on the outermost inner mold modified crescent plate 104; after the template modification is completed, it can be used for the prefabrication of the second ring segment.

[0036] Among them, the inner arc radius of the first inner mold modified crescent plate 104 is consistent with the outer arc radius of the inner mold keel 1, and the difference between the outer arc radius of the outermost inner mold modified crescent plate 104 and the thickness of the inner mold panel 103 is the inner wall radius of the tower section.

[0037] If m is less than 3, the next set of templates is used to construct the third ring segment. If it is not less than 3, the above process is repeated and the templates are modified again for the prefabrication of the third ring segment.

[0038] The reusable formwork system for the precast concrete tower provided by the present invention modifies the inner form keel 1 and the outer form keel 2 respectively by modifying the inner form 104 and the outer form 204, so that the sizes of the outer form panel 203 and the inner form panel 103 are respectively consistent with the outer wall radius and the inner wall radius of the construction tower section, so that a set of formwork can be used for prefabrication of multiple ring segments of different sizes, thereby shortening the formwork customization period, improving the use efficiency of the formwork, and saving the formwork cost.

[0039] Embodiment 2:

[0040] Based on Example 1, this example provides a reusable formwork system for a precast concrete tower, wherein the outer formwork modified crescent plate 204 is thin in the middle and thick on both sides, and the outer arc radius is equal to the inner diameter of the outer formwork panel 203.

[0041] like Figure 4 As shown, when the outer mold keel 2 is modified, an outer mold modified crescent plate 204 needs to be welded on the inner side of the arc of the outer mold keel 2. The outer mold modified crescent plate 204 is thin in the middle and thick on both sides. The outer arc radius of the outer mold modified crescent plate 204 is consistent with the inner arc radius of the original outer mold keel 2. After welding the outer mold modified crescent plate 204, the inner arc radius of the outer mold template minus the thickness of the outer mold panel 203 is the outer wall radius of the corresponding position of the prefabricated ring segment. After the welding of the outer mold modified crescent plate 204 is completed, the excess parts at both ends of the outer mold keel 2 need to be cut off.

[0042] Embodiment 3:

[0043] Based on Example 1, this example provides a reusable formwork system for a precast concrete tower, wherein the inner mold modified crescent plate 104 is thick in the middle and thin on both sides, and the inner arc radius is equal to the outer diameter of the inner mold panel 103.

[0044] like Figure 3 As shown, when modifying the inner mold keel 1, it is necessary to weld the inner mold modified crescent plate 104 on the outer side of the inner mold keel 1 arc. The inner mold modified crescent plate 104 is thick in the middle and thin on both sides. The inner arc radius of the inner mold modified crescent plate 104 is consistent with the outer arc radius of the original inner mold keel 1. After welding the inner mold modified crescent plate 104, the outer arc radius of the inner mold template minus the thickness of the inner mold panel 103 is the inner wall radius of the corresponding position of the prefabricated ring segment. After the welding of the inner mold modified crescent plate 104 is completed, the redundant parts at both ends of the inner mold keel 1 need to be cut off. After the modification of the inner mold modified crescent plate 104 and the outer mold modified crescent plate 204, the wall thickness of the tower gradually increases from bottom to top.

[0045] Embodiment 4:

[0046] Based on Example 1, this example provides a reusable formwork system for a precast concrete tower, wherein the inner formwork panel 103 and the outer formwork panel 203 are both two-layer panels, the inner panel is composed of a plurality of longitudinally laid strip panels, and the outer panel is laid transversely, and the inner panel and the outer panel are fixedly connected.

[0047] Since the outer panel is a whole panel, the function of the inner panel is to support the outer panel laid transversely (i.e. in the circumferential direction).

[0048] Embodiment 5:

[0049] Based on Example 1, this example provides a reusable formwork system for a precast concrete tower, wherein the inner form keel 1 and the outer form keel 2 are both composed of a plurality of horizontal arc steel plates and vertical steel sections, and the vertical steel sections are fixed between the horizontal arc steel plates.

[0050] like Figure 2 As shown, the inner mold keel 1 is composed of an inner mold keel horizontal arc plate 101 and an inner mold keel vertical steel 102, and the outer mold keel 2 is composed of an outer mold keel horizontal arc plate 201 and an outer mold keel vertical steel 202. The inner mold keel 1 and the outer mold keel 2 can be assembled into two, three or four ring pieces. The inner mold keel 1 is fixed with a steel anchor, and the arc steel plate joint is firmly welded with steel bars.

[0051] The inner formwork keel horizontal arc plate 101 and the inner formwork keel vertical steel 102, the outer formwork keel horizontal arc plate 201 and the outer formwork keel vertical steel 202 are machined in a formwork processing plant, pre-assembled and welded in the factory, and anti-corrosion treated.

[0052] Embodiment 6:

[0053] On the basis of Example 1, this example provides a reusable formwork system for a precast concrete tower, wherein the inner formwork panels 103 and the outer formwork panels 203 are both provided with partitions or gaskets in sections.

[0054] The provision of partitions or gaskets can realize the segmented prefabrication of the ring segments.

[0055] Embodiment 7:

[0056] On the basis of Example 1, this example provides a reusable formwork system for a precast concrete tower, wherein the outer formwork keel 2 and the inner formwork keel 1 are connected by tension bolts 3 .

[0057] The outer formwork keel 2 and the inner formwork keel 1 are connected by tension bolts 3 to prevent the formwork from being squeezed and expanded during concrete pouring, thereby affecting the prefabrication pouring effect of the ring segment.

[0058] Embodiment 8:

[0059] On the basis of Example 4, this example provides a reusable formwork system for a precast concrete tower, wherein the inner panel is fixedly connected to the inner form keel 1 or the outer form keel 2, and the outer panel is fixed to the inner layer panel by nailing.

[0060] The inner panel is a strip panel, which can be tied to the inner mold keel 1 or the outer mold keel 2 by steel wire rope, and the outer panel is fixed to the inner panel by nails.

[0061] Embodiment 9:

[0062] The present embodiment provides a reusable formwork system for a precast concrete tower, including an inner form keel 1, an outer form keel 2, a bottom formwork 4, an inner form modified crescent plate 104 and an outer form modified crescent plate 204. An inner form panel 103 is fixedly arranged on the outer side of the inner form keel 1, an outer form panel 203 is fixedly arranged on the inner side of the outer form keel 2, and the bottom formwork 4 is arranged between the inner form panel 103 and the outer form panel 203, and the three form a concrete pouring space.

[0063] The outer mold keel 2 and the inner mold keel 1 are reinforced by tension bolts 3 and steel pipes. The outer mold keel 2 and the inner mold keel 1 are respectively equipped with an outer mold modified crescent plate 204 and an inner mold modified crescent plate 104, which are used to modify the outer mold keel 2 and the inner mold keel 1 after the prefabrication of a ring segment is completed to meet the prefabrication size requirements of the next ring segment. The bottom template 4 is an arc-shaped steel plate, and the bottom template 4 is cut with pre-buried holes for prestressed pipes according to the design, which are used to fix the pre-buried pipes.

[0064] Before installing the template, the template positioning line needs to be marked on the prefabricated pedestal, and the inner mold keel 1 needs to be placed on the square wood by a crane, aligned with the inner mold positioning line on the prefabricated pedestal, and the position of the inner mold keel 1 needs to be fixed with a steel anchor, and the arc steel plate joint needs to be welded firmly with steel bars. Then, the inner mold panel 103 is laid on the outside of the inner mold keel 1 to form the inner mold. The inner mold panel 103 uses two layers of plywood, and the inner panel is 20mm thick plywood, which is laid longitudinally and fixed with the inner mold keel 1 steel plate with steel wire, and then 10mm thick plywood is laid horizontally and fixed with the longitudinal plywood with nails, and then the surface of the inner mold panel 103 is brushed with a release agent.

[0065] Place the outer mold keel 2 on its back on the bracket, and lay the outer mold panel 203 on the inner side of the outer mold keel 2 to form an outer mold. The outer mold panel 203 uses two layers of plywood. The inner panel is 20mm thick plywood, which is laid longitudinally and fixed to the steel plate of the outer mold keel 2 with steel wire. Then, 10mm thick plywood is laid horizontally and fixed to the longitudinal plywood with nails. Then, the surface of the outer mold panel 203 is brushed with a release agent.

[0066] After the slab is laid, use a crane to lift the outer formwork to the prefabricated pedestal and close it with the inner formwork. Place the bottom formwork 4 according to the template positioning line. Note that the anchor cable pipe hole is aligned with the anchor cable pipe positioning line, and use a level to level the bottom formwork. Install the outer formwork keel 2 after installing the steel bar embedded parts. Put the outer formwork keel 2 close to the bottom formwork 4, and locate the top position through the center point of the well frame. After the position verification is completed, weld the arc plate of the outer formwork keel 2 with steel bars, and seal the joints with sealing strips to prevent leakage. The inner formwork keel 1 and the outer formwork keel 2 are reinforced by tension bolts 3 and steel pipes. Pour concrete after checking and accepting the formwork and embedded parts.

[0067] When removing the formwork after the concrete pouring is completed, first remove the tension bolts 3, cut off the steel bar anchors and the steel bars connecting the keel arc plate, carefully pry the inner and outer molds apart, then hoist the outer mold onto the bracket for modification, and hoist the inner mold onto the next prefabricated pedestal for modification. The outer mold is hoisted onto the bracket, the two layers of plywood are removed, the corresponding modified crescent plates are welded to the inner side of the keel arc plate, and the excess arc plates on both sides are cut off, and then the keel size is checked. After the verification is correct, the two layers of plywood are fixed to the keel. The method of modifying the inner mold is similar to that of the outer mold, except that the inner mold is modified on a prefabricated pedestal or a special template pedestal, and the inner mold modified crescent plates 104104 are welded to the outer side of the inner mold keel 1 arc plate. After the template modification is completed, it can be used for the prefabrication of the next ring segment.

[0068] Embodiment 10:

[0069] The present embodiment provides a construction method for a precast concrete tower of an onshore wind farm, which adopts a reusable formwork system of a precast concrete tower, and casts concrete on each concrete tower section in a bottom-up order, wherein each adjacent m tower sections share a set of inner form keels 1 and outer form keels 2, and after the casting construction of the first tower section is completed, the formwork is removed, and the inner form keel 1 and the outer form keel 2 are respectively modified by the inner form modified crescent plate 104 and the outer form modified crescent plate 204, so that the sizes of the outer form panel 203 and the inner form panel 103 are respectively consistent with the outer wall radius and the inner wall radius of the second tower section, after the modification is completed, the second tower section is cast, and then the formwork is removed, and the inner form modified crescent plate 104 and the outer form modified crescent plate 204 are modified again, so that the formed formwork is consistent with the size of the third tower section, and after the modification is completed, the third tower section is finally cast, and the casting of m tower sections is completed after the modification is sequentially completed.

[0070] This method was used to construct a hybrid tower in a certain project. The concrete tower section of the hybrid tower has 20 ring segments. According to conventional processes, 20 ring segment template keels need to be processed, and the steel consumption is about 250t. With this method, three adjacent ring segments share a set of template keels, and only 7 ring segment template keels, as well as some inner mold modified crescent plates 104 and outer mold modified crescent plates 204, need to be processed, and the steel consumption is about 90t, saving about 160t of steel.

[0071] It takes about 60 days to process 20 ring-segment formwork keels, and about 30 days to process 7 ring-segment formwork keels and the matching crescent arc strip plates, saving 30 days of construction time; the formwork modification extends the construction period by 6 days, saving an overall 24 days of construction time.

[0072] Embodiment 11:

[0073] On the basis of Example 10, this embodiment provides a construction method for a precast concrete tower of an onshore wind farm. When the inner mold keel 1 is modified by the inner mold modified crescent plate 104, the inner mold panel 103 is first removed, and then the inner mold modified crescent plates 104 of different sizes are welded layer by layer on the outside of the inner mold keel 1, so that the inner arc radius of the innermost inner mold modified crescent plate 104 is consistent with the outer arc radius of the inner mold keel 1, and the difference between the outer arc radius of the outermost inner mold modified crescent plate 104 and the thickness of the inner mold panel 103 is the inner wall radius of the tower section.

[0074] This method enables a set of templates to prefabricate multiple ring segments, thereby shortening the template customization period and saving template costs.

[0075] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A reusable formwork system for a precast concrete tower, characterized in that: It includes an inner mold keel, an outer mold keel, a bottom template, an inner mold modified moon pressure plate and an outer mold modified moon pressure plate, the outer mold keel is arranged on the outer periphery of the inner mold keel and the two are fixedly connected, the outer side of the inner mold keel is fixedly provided with an inner mold panel to form an inner mold, the inner side of the outer mold keel is fixedly provided with an outer mold panel to form an outer mold, the inner mold and outer mold surfaces are both brushed with a surface release agent, the bottom template is arranged between the inner mold panel and the outer mold panel, and the inner mold panel, the outer mold panel and the bottom template form a casting space; The inner mold modified moon pressure plate is arranged between the inner mold keel and the inner mold panel, and the outer mold modified moon pressure plate is arranged between the outer mold keel and the outer mold panel. The inner mold modified moon pressure plate and the outer mold modified moon pressure plate both include a series of size moon pressure plates.

2. A reusable formwork system for a precast concrete tower according to claim 1, characterized in that: The outer mold modified moon pressure plate is thin in the middle and thick on both sides, and the outer arc radius is equal to the inner diameter of the outer mold panel.

3. The reusable formwork system for a precast concrete tower according to claim 1, characterized in that: The inner mold modified moon pressure plate is thick in the middle and thin on both sides, and the inner arc radius is equal to the outer diameter of the inner mold panel.

4. The reusable formwork system for a precast concrete tower according to claim 1, characterized in that: The inner panel and the outer panel are both two-layer panels, the inner panel is composed of a plurality of strip panels laid longitudinally, and the outer panel is laid transversely, and the inner panel and the outer panel are fixedly connected.

5. The reusable formwork system for a precast concrete tower according to claim 1, characterized in that: The inner mold keel and the outer mold keel are both composed of a plurality of horizontal arc steel plates and vertical steel sections, and the vertical steel sections are fixed between the horizontal arc steel plates.

6. The reusable formwork system for a precast concrete tower according to claim 1, characterized in that: The outer mold keel and the inner mold keel are connected by tension bolts.

7. The reusable formwork system for a precast concrete tower according to claim 4, characterized in that: The inner panel is fixedly connected to the inner mold keel or the outer mold keel, and the outer panel is fixed to the inner layer panel by nailing.

8. A construction method for a precast concrete tower of an onshore wind farm, using the reusable formwork system for a precast concrete tower according to any one of claims 1 to 7, characterized in that: Concrete is poured for each concrete tower section in order from bottom to top, wherein each adjacent m tower sections share a set of inner mold keels and outer mold keels. After the pouring construction of the first tower section is completed, the mold is removed, and the inner mold keel and the outer mold keel are modified respectively by means of the inner mold modified moon pressure plate and the outer mold modified moon pressure plate, so that the sizes of the outer mold panel and the inner mold panel are respectively consistent with the outer wall radius and the inner wall radius of the second tower section. After the modification is completed, the second tower section is poured, and then the mold is removed, and the inner mold is modified again by means of the inner mold modified moon pressure plate and the outer mold modified moon pressure plate, so that the formed template is consistent with the size of the third tower section. After the modification is completed, the third tower section is finally poured, and the casting of m tower sections is completed after the modification is sequentially completed.

9. The construction method of a prefabricated concrete tower for an onshore wind farm according to claim 8, characterized in that: When the inner mold keel is modified by the inner mold modified moon pressure plate, the inner mold panel is first removed, and then inner mold modified moon pressure plates of different sizes are welded layer by layer on the outside of the inner mold keel, so that the inner arc radius of the innermost inner mold modified moon pressure plate is consistent with the outer arc radius of the inner mold keel, and the difference between the outer arc radius of the outermost inner mold modified moon pressure plate and the thickness of the inner mold panel is the inner wall radius of the tower section.

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