Fabricated extended foundation formwork and construction method

Abstract

The invention belongs to the technical field of electric power foundation construction, and discloses an assembly type extended foundation formwork and a construction method.The assembly type extended foundation formwork comprises a pedestal, a main component formwork is installed on the pedestal, the main component formwork comprises a plurality of first formworks, and the first formworks are detachably connected; the bottom end of the first template is rotatably connected with the second templates, and the second templates are detachably connected; the bottom end of the second template is rotationally connected with the third templates, and the third templates are spliced and connected; the auxiliary component templates are placed on the two sides of the main component template, and each auxiliary component template comprises four side templates; a plurality of side holes are uniformly formed in the third template facing the side templates and are used for extending out of U-shaped ribs of the main component; corresponding side holes are formed in the side formworks facing the third formwork and used for extending out of the U-shaped ribs of the auxiliary component. A positioning template is installed between the main component template and the auxiliary component template, the positioning template is also provided with a plurality of through grooves which correspond to the side holes and are provided with openings in the bottom faces, and the width of the side holes is larger than that of the through grooves. The construction efficiency and the repeated utilization rate of the formwork can be improved.

Description

Technical Field

[0001] This invention belongs to the field of power foundation construction technology, specifically relating to a prefabricated extended foundation template and construction method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Independent spread foundations are used in power foundation construction, such as the foundations of transmission line towers (usually four tower legs, with one foundation under each leg). When constructing power foundations on mountains, prefabricated spread foundations are often chosen due to transportation difficulties or unpredictable weather, thus saving construction time.

[0004] Prefabricated extended foundations also face transportation difficulties due to their weight or size. To solve this technical problem, the prior art discloses a prefabricated slab foundation, which is composed of three prefabricated components arranged horizontally and spliced ​​together. Each prefabricated component has a groove template on the opposite side, and the prefabricated components are connected by cast-in-place.

[0005] The above solution has the following drawbacks: In the above scheme, the three prefabricated components are fixedly connected to the groove templates on opposite sides. During factory prefabrication, the groove templates must be re-equipped each time, and then the groove templates are reassembled with the other templates. This results in material waste, greatly restricts the circulation of templates, and slows down the efficiency of prefabrication construction. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a prefabricated extended foundation template and construction method, which can solve the technical problems of material waste and slow efficiency caused by reassembling the groove template each time in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In the first aspect, a prefabricated extended foundation template is provided, including a pedestal on which a main component template and a secondary component template are detachably installed; The main component template includes multiple first templates that are detachably connected to each other; the bottom of the first templates is rotatably connected to the second templates that are detachably connected to each other; the bottom of the second templates is rotatably connected to the third templates that are spliced ​​together; the secondary component templates are placed on both sides of the main component templates and include four side templates. Several side holes are evenly opened on the third template facing the side template for the main component U-shaped reinforcement to extend out; corresponding side holes are also opened on the side template facing the third template for the secondary component U-shaped reinforcement to extend out. A positioning template is installed between the main component template and the secondary component template. The positioning template also has multiple through slots with bottom openings corresponding to the side holes. The width of the side holes is greater than the width of the through slots.

[0008] Preferably, the width of the through groove is equal to the sum of the diameters of the U-shaped ribs of the main component and the U-shaped ribs of the secondary component.

[0009] Preferably, multiple sets of first positioning grooves are provided on the pedestal, the end of the third template coincides with the inner side of the corresponding first positioning groove, and the first positioning plate is inserted into the first positioning groove.

[0010] Preferably, the pedestal also has multiple sets of second positioning grooves on both sides of the first positioning groove, the end of the side template coincides with the inner side of the corresponding second positioning groove, and the second positioning plate is inserted into the second positioning groove.

[0011] Preferably, the two side templates of the secondary component template have the same length as the third template, and the horizontal line connecting the first positioning groove and the second positioning groove, which are distributed along the length direction of the platform, is parallel to the length direction of the platform.

[0012] Preferably, multiple limiting steel wire ropes are connected between the first template and the second template.

[0013] Preferably, the rotational connections between the first template and the second template, and between the second template and the third template, are achieved through multiple evenly distributed hinges.

[0014] Preferably, locking side plates are fixedly connected to the outer surfaces of the side ends of the first template and the second template. Several locking bolt holes are opened on the locking side plates, and a set angle is formed between the locking side plates and the first template or the second template.

[0015] Preferably, the outer sides of the main component U-shaped ribs and the secondary component U-shaped ribs of the exposed template are wrapped with a thin film for protection.

[0016] Secondly, a construction method for the aforementioned prefabricated extended foundation formwork is provided, the specific steps of which include: Select the main component template, secondary component template, and positioning template with the specified dimensions according to the extended foundation specifications; After the main component's reinforcing cage is tied, the third formwork is installed on the outside of the main component's reinforcing cage, so that the main component's U-shaped bars pass through the side holes of the third formwork and connect with the main component's reinforcing cage; the second formwork is flipped upwards and multiple second formworks are connected together, then the first formwork is flipped upwards and multiple first formworks are connected together; When tying the main component's reinforcing cage, install the secondary component's formwork and tie the secondary component's reinforcing cage, so that the secondary component's U-shaped bars pass through the side holes of the side formwork and connect with the secondary component's reinforcing cage; Wrap the U-shaped reinforcement extending from the template with film and install the positioning template, then pour concrete; After curing, remove the positioning template and positioning plate, then remove the side template without side holes, move the side template with side holes to the main component template, lift away the secondary component, and then remove the side template with side holes. Then remove the first template, the second template, and the third template in sequence.

[0017] Compared with the prior art, the advantages and positive effects of this invention are: This invention features pre-drilled side holes on the opposite sides of the main component template and the secondary component template, allowing U-shaped reinforcing bars to pass through the template. During pouring, the side holes are sealed by positioning templates. Furthermore, the design of the through-groove width being smaller than the side hole width facilitates smoother removal of the side templates or the third template. This overcomes the problem in existing technologies where the grooved template is fixedly connected to the precast component, requiring new grooved templates for each formwork erection, thus improving construction efficiency and template reuse rate. Additionally, in the main component template, the first template is flipped relative to the second template, and the second template is flipped relative to the third template. This allows the entire main component template to be folded flat for storage or unfolded directly for installation, improving template installation efficiency. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1 This is a front view of a prefabricated extended foundation template without the positioning template installed, according to Embodiment 1 or Embodiment 2 of the present invention; Figure 2 This is a top view of a prefabricated extended foundation template without the installation of the positioning template in Embodiment 1 or Embodiment 2 of the present invention; Figure 3 This is a front view of the main component template of Embodiment 1 or Embodiment 2 of the present invention; Figure 4 This is a front view of the sub-component template of Embodiment 1 or Embodiment 2 of the present invention; Figure 5 This is a side view of a sub-template of the main component template in Embodiment 1 or Embodiment 2 of the present invention; Figure 6 This is a front view of the positioning template of Embodiment 1 or Embodiment 2 of the present invention; In the picture: 1. Platform; 11. First positioning groove; 12. Second positioning groove; 2. Main component template; 21. First template; 22. Second template; 23. Third template; 231. Side hole; 24. Main component U-shaped rib; 25. Limiting wire rope; 26. Locking side plate; 27. Hinge; 3. Secondary component template; 31. Side template; 32. Secondary component U-shaped rib; 4. Positioning template; 41. Through groove; 5. First positioning plate; 6. Second positioning plate; 7. Lifting assembly. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] The present invention will now be described in detail with reference to the accompanying drawings.

[0022] Example 1 This embodiment discloses a prefabricated extended foundation template, such as... Figure 1 , Figure 6 As shown, the system includes a base 1, on which a main component template 2 and a secondary component template 3 are detachably mounted. A positioning template 4 is installed between the main component template 2 and the secondary component template 3. In this embodiment, the base 1 provides a stable reference surface for the installation of the main component template 2, the secondary component template 3, and the positioning template 4.

[0023] Main component formwork 2 is the formwork used for pouring the main load-bearing part of the extended foundation (hereinafter referred to as "main component"), such as... Figure 1 , Figure 5 As shown, the main component template 2 is composed of multiple sub-templates for easy storage. Specifically, the main component template 2 includes four first templates 21, which are detachably connected to form a column template; the bottom end of the first template 21 is rotatably connected to the second template 22, which are detachably connected to each other; the bottom end of the second template 22 is rotatably connected to the third template 23, which are assembled together.

[0024] Understandably, the main component template 2 is divided into four groups: the first template 21, the second template 22, and the third template 23. Each group of templates can be disassembled and connected, and can be folded for storage.

[0025] like Figure 1 , Figure 2 As shown, secondary component templates 3 are placed on both sides of the main component template 2. The secondary component templates 3 are templates used for pouring the auxiliary part of the extended foundation (hereinafter referred to as "secondary component"). The secondary component template 3 includes four side templates 31, which enclose the pouring space of the secondary component.

[0026] like Figure 1 , Figure 3 , Figure 4 As shown, several side holes 231 are evenly opened along the length of the third template 23 facing the secondary component template 3 of the main component template 2, for the main component U-shaped reinforcement 24 to extend out; the secondary component template 3 also has side holes 231 of corresponding number, spacing and position on its side template 31 facing the main component template 2, for the secondary component U-shaped reinforcement 32 to extend out. It can be understood that this design can allow the secondary component U-shaped reinforcement 32 to be cast integrally into the secondary component, or the main component U-shaped reinforcement 24 to be cast integrally into the main component. After being transported to the construction site, the main component and the secondary component are placed in the designed position, and then the main component U-shaped reinforcement 24 and the secondary component U-shaped reinforcement 32 are tied together, the post-cast strip template is erected, and wet connection is performed on the construction site.

[0027] It should be noted that side holes 231 are opened on one side of the main component template 2 or the secondary component template 3 for the main component U-shaped ribs 24 or the secondary component U-shaped ribs 32 to pass through. Although this allows the main component U-shaped ribs 24 to connect with the main component, or the secondary component U-shaped ribs 32 to the secondary component, the installation of the main component U-shaped ribs 24 or the secondary component U-shaped ribs 32 will lead to difficulties in demolding.

[0028] In this regard, such as Figure 1 , Figure 6 As shown, in this embodiment, a positioning template 4 is installed between the main component template 2 and the secondary component template 3. The thickness of the positioning template 4 is equal to the thickness of the reserved post-pouring strip. Figure 6 As shown, the positioning template 4 also has multiple through slots 41 corresponding to the position and number of the side holes 231. In this embodiment, the bottom surface of the through slots 41 is open, and when the positioning template 4 is inserted from top to bottom between the main component template 2 and the secondary component template 3, the through slots 41 can wrap around the main component U-shaped rib 24 and the secondary component U-shaped rib 32 from top to bottom.

[0029] It should be noted that in this embodiment, when the positioning template 4 is installed between the main component template 2 and the secondary component template 3, it can block the side hole 231, so that the flowing cement slurry can only fill the space of the through groove 41.

[0030] It should be noted that in this embodiment, the centerline of the side hole 231 coincides with the centerline of the through groove 41, but the width of the side hole 231 is greater than the width of the through groove 41. The ingenuity of this design lies in the fact that when pouring the main component template 2 or the secondary component template 3, cement slurry may flow out from the side hole 231, but since the width of the through groove 41 is less than the width of the side hole 231, the cement slurry can only flow out from the through groove 41 to cover the exposed main component U-shaped reinforcement 24 and secondary component U-shaped reinforcement 32. When the curing is completed and the formwork is removed, first tap the main component U-shaped rib 24 and the secondary component U-shaped rib 32 to separate them. Then, remove the other side formwork 31 of the secondary component formwork 3. Move the side formwork 31 facing the main component formwork 2 towards the main component formwork 2. Since the width of the side hole 231 is greater than the width of the through groove 41, the side formwork 31 can easily slide on the main component U-shaped rib 24 and the secondary component U-shaped rib 32. Then, lift the secondary component away and remove the side formwork 31 with the side hole 231. Finally, remove the main component formwork 2.

[0031] If the width of the through groove 41 is the same as the width of the side hole 231, during formwork removal, there may be issues such as the cement residue on the outer surfaces of the main component U-shaped reinforcement 24 and the secondary component U-shaped reinforcement 32 being too thick, making separation difficult. Alternatively, the cement residue on the outer surfaces of the main component U-shaped reinforcement 24 and the secondary component U-shaped reinforcement 32 may be too thick, making it difficult to remove the side formwork 31 or the third formwork 23 from the main component U-shaped reinforcement 24 and the secondary component U-shaped reinforcement 32. It should be noted that several lifting points are pre-embedded on the top surfaces of both the main component and the secondary component, allowing them to be lifted after formwork removal.

[0032] This embodiment features side holes pre-drilled on the opposite sides of the main component template and the secondary component template, allowing U-shaped reinforcing bars to pass through the template. During pouring, the side holes are sealed by positioning templates. Furthermore, the design of the through-groove width being smaller than the side hole width facilitates smoother removal of the side templates or the third template. This overcomes the problem in existing technologies where the grooved template is fixedly connected to the precast components, requiring new grooved templates for each formwork erection. This improves construction efficiency and template reuse rate.

[0033] In this embodiment, the width of the through groove 41 is equal to the sum of the diameters of the main component U-shaped rib 24 and the secondary component U-shaped rib 32. By controlling the size of the through groove 41, the volume of cement slurry flowing out is reduced.

[0034] like Figure 1 , Figure 3 As shown, multiple sets of first positioning slots 11 are formed on the base 1, each set including four first positioning slots 11, which together form a rectangle; the rectangle formed by each set of first positioning slots 11 corresponds to the bottom surface of a main component with a set area. It can be understood that the corresponding main component template 2 is selected according to the expansion base of the set area, that is, the third template 23 of the set length is selected.

[0035] like Figure 1, Figure 3 As shown, the third template 23 is installed perpendicular to the base 1, and the end of the third template 23 coincides with the inner side of the first positioning groove 11 of the corresponding group. The first positioning plate 5 is inserted into the first positioning groove 11. The function of the first positioning plate 5 is to prevent the third template 23 from moving outward and causing the template to burst when concrete is poured into the main component template 2.

[0036] It is understood that the second template 22 is a trapezoidal template, with the top of the second template 22 having the same dimensions as the bottom of the first template 21, and the bottom of the second template 22 having the same length as the third template 23. In this embodiment, the bottom cross-section of the main component is square. When the height of the trapezoid is equal to the difference between the length of the third template 23 and the length of the first template 21, the second template 22 is parallel to the pedestal 1. When the height of the trapezoid is greater than the difference between the length of the third template 23 and the length of the first template 21, the formed main component is as follows: Figure 1 The slope structure shown.

[0037] like Figure 1 , Figure 4 As shown, the base 1 also has multiple sets of second positioning slots 12 on both sides of the first positioning slot 11. Similar to the first positioning slot 11, each set of second positioning slots 12 includes four slots, and the four second positioning slots 12 combine to form a rectangle. Each rectangle formed by the set of second positioning slots 12 corresponds to the bottom surface of a sub-component with a predetermined area. For example... Figure 1 , Figure 4 As shown, the side formwork 31 is installed perpendicular to the base 1, and the end of the side formwork 31 coincides with the inner side of the corresponding second positioning groove 12. The second positioning plate 6 is inserted into the second positioning groove 12. The function of the second positioning plate 6 is to prevent the side formwork 31 from moving outward and causing the formwork to burst when concrete is poured into the sub-component formwork 3.

[0038] like Figure 2 As shown, the two side templates 31 of the secondary component template 3 have the same length as the third template 23, ensuring that the secondary component can be aligned with the main component; as Figure 1 As shown, the horizontal line connecting the first positioning groove 11 and the second positioning groove 12, which are distributed along the length direction of the base 1, is parallel to the length direction of the base 1, ensuring that the main component template 2 and the secondary component template 3 are aligned during installation.

[0039] like Figure 1 , Figure 3 , Figure 4 As shown, the first positioning groove 11 and the second positioning groove 12 have the same size and are both L-shaped positioning grooves. The thickness of the first positioning plate 5 and the second positioning plate 6 is equal to the width of the first positioning groove 11 or the second positioning groove 12.

[0040] like Figure 1 , Figure 3 , Figure 4 As shown, the line connecting the right-angle point of the first positioning groove 11 and the right-angle point of the main component passes through the center of the main component; the line connecting the right-angle point of the second positioning groove 12 and the right-angle point of the sub-component passes through the center of the sub-component. This positioning method ensures the positioning and limiting of the main component template 2 and the sub-component template 3 on the pedestal 1. In this embodiment, the pedestal 1 is made of steel plate, and multiple sets of first positioning grooves 11 and second positioning grooves 12 are machined by milling.

[0041] Selecting different sizes of templates according to the basic specifications can improve the versatility and adaptability of the templates, enabling them to be flexibly applied to foundation construction projects of various sizes, thereby improving construction efficiency and reducing the amount of on-site adjustments.

[0042] like Figure 1 As shown, the top of the main component template 2 is connected to the hoisting assembly 7, which is rotatably connected to the top of the first template 21. The function of the hoisting assembly is to lift and rotate the second template 22 upwards into place after the third template 23 is installed in place, using hoisting equipment (such as a tower crane). The hoisting assembly 7 is a separate type, that is, the number is the same as that of the first template 21, and each first template 21 is rotatably connected to the top of one hoisting assembly 7.

[0043] like Figure 1 , Figure 3 As shown, multiple limiting steel wire ropes 25 are also connected between the first template 21 and the second template 22. The function of the limiting steel wire ropes 25 is to limit the relative position between the first template 21 and the second template 22 when the first template 21 is hoisted, so that when the first template 21 is perpendicular to the platform 1, the second template 22 maintains a set angle relative to the first template 21, which facilitates the installation of the second template 22 into place.

[0044] It should be noted that lifting rings (not shown in the figure) are also welded and fixed on the outer side of the side template 31 of the sub-component template 3, which are used to lift the side template 31 to the storage position.

[0045] like Figure 1 , Figure 5 As shown, in this embodiment, the rotational connections between the first template 21 and the hoisting assembly 7, between the first template 21 and the second template 22, and between the second template 22 and the third template 23 are all achieved through multiple evenly distributed hinges 27. The blades of the hinges 27 are respectively fixedly connected to the first template 21 and the hoisting assembly 7, or to the first template 21 and the second template 22, or to the second template 22 and the third template 23.

[0046] In some embodiments, multiple sleeves (not shown in the figure) are fixedly connected to the bottom outer surface of the hoisting assembly 7, the first template 21, and the second template 22, and multiple sleeve rods (not shown in the figure) that mate with the sleeves are fixedly connected to the top outer surface of the first template, the second template, and the third template. The sleeve rods are inserted into the sleeves to achieve rotatable and detachable connections. Specifically, the inner wall of the sleeve is smooth, and the sleeve is made of steel or aluminum alloy and fixed to the bottom outer surface of the hoisting assembly or the first template or the second template by welding. The sleeve rods are two coaxial solid rods with different diameters. The solid rod with the larger diameter is welded and fixed to the top outer surface of the first template, the second template, or the third template, and the solid rod with the smaller diameter is inserted into the sleeve. It should be noted that a limiting hole perpendicular to the axis of the solid rod is opened at the end of the solid rod with the smaller diameter away from the solid rod with the larger diameter. The length of the solid rod with the smaller diameter is greater than the length of the sleeve. After the solid rod with the smaller diameter passes through the sleeve, a locking pin is inserted into the limiting hole.

[0047] like Figure 1 , Figure 3 As shown, locking side plates 26 are fixedly connected to the outer surfaces of the side ends of the first template 21 and the second template 22. Several locking bolt holes are provided on the locking side plates 26. After adjacent first templates 21 are joined together, the locking bolt holes are aligned, and locking bolts are passed through to connect the first templates 21. The second templates 22 are connected and fixed in the same way. The locking side plates 26 close the gap between the first templates 21 and the second template 22, preventing either the first template 21 or the second template 22 from being pushed open during concrete pouring.

[0048] In this embodiment, the locking side plate 26 can be fixedly connected to the outer side surface of the first template 21 or the second template 22 by welding. Figure 1 As shown, the locking side plate 26 forms an angle with the first template 21 or the second template 22, and the angle is set to 135°. This facilitates the connection between adjacent first templates 21 or second templates 22 when splicing the first template 21 or the second template 22.

[0049] In this embodiment, the length of the positioning template 4 is equal to the length of the third template 23, such as... Figure 6 As shown, multiple lifting rings are also fixedly connected to the top of the positioning template 4 to facilitate lifting. After the main component template 2 and the secondary component template 3 are installed, the positioning template 4 is lifted and inserted between the main component template 2 and the secondary component template 3. After the concrete curing is completed, the positioning template 4 is lifted out.

[0050] In this embodiment, both the main and secondary U-shaped reinforcing bars of the exposed formwork are wrapped with a protective film. This film serves to ensure that the cement slurry coats the outside of the film during pouring, keeping the surfaces of the main and secondary U-shaped reinforcing bars clean. Before pouring the post-pouring strip, the cement slurry is removed and the film is then peeled off, which facilitates good bonding between the reinforcing bars and concrete, ensuring the reliability and durability of the structural connection. The film can be made of polymer materials such as polyethylene or PVC.

[0051] Example 2 This embodiment discloses a construction method for a prefabricated extended foundation formwork, which applies a prefabricated extended foundation formwork disclosed in Embodiment 1. The specific steps include: Based on the extended foundation specifications, select the main component template 2, secondary component template 3, and positioning template 4 with the specified dimensions; After the main component reinforcement cage is tied, the main component formwork 2 is installed. The third formwork 23 is installed on the outside of the main component reinforcement cage, so that the main component U-shaped reinforcement passes through the side hole 231 of the third formwork 23 and is tied or welded to the main component reinforcement cage. The second formwork 22 is flipped upward into place and multiple second formworks 22 are connected. Then the first formwork 21 is flipped upward and multiple first formworks 21 are connected. When binding the main component steel cage, install the secondary component formwork 3 and bind the secondary component steel cage, so that the secondary component U-shaped bar passes through the side hole 231 of the side formwork 31 and is bound or welded to the secondary component steel cage. Wrap film around all the U-shaped ribs extending from the template, and install positioning template 4 between the main component template 2 and the secondary component template 3; then pour concrete into the main component template 2 and the secondary component template 3; After the maintenance is completed, first remove the positioning template and the first positioning plate and the second positioning plate, then remove the side templates of the secondary component template 3 that do not have side holes, move the side templates with side holes to the main component template 2, lift away the secondary component, and then remove the side templates with side holes. Then remove the first template, the second template, and the third template in sequence.

[0052] In this embodiment, the main component formwork can be folded and stored after being removed; after the main and secondary components are transported to the site, they are assembled. At the assembly site, the outer concrete of the U-shaped steel bars is knocked off, the film is torn off, and the post-pouring strip is poured.

[0053] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A fabricated spread foundation template, characterized by, The pedestal is detachably installed with a main component template and a secondary component template; The main component template comprises a plurality of first templates which are detachably connected with each other; the bottom end of the first template is rotatably connected with a second template, and the second templates are detachably connected with each other; the bottom end of the second template is rotatably connected with a third template, and the third templates are detachably connected with each other; the secondary component template is placed on both sides of the main component template, and the secondary component template comprises four side templates; A plurality of side holes are uniformly arranged on the third template facing the side templates, and are used for extending the main component U-shaped rib; The side templates facing the third template are also provided with corresponding side holes for extending the secondary component U-shaped rib; the main component template and the secondary component template are installed with a positioning template, and a plurality of through grooves with a bottom opening corresponding to the side holes are arranged on the positioning template, and the width of the side hole is greater than the width of the through groove.

2. A fabricated spread footing template as claimed in claim 1, wherein, The width of the through groove is equal to the diameter of the main component U-shaped rib and the secondary component U-shaped rib.

3. A fabricated spread footing template according to claim 1, wherein, A plurality of first positioning grooves are arranged on the pedestal, and the end of the third template is coincided with the inner side of the corresponding first positioning groove; and a first positioning plate is inserted into the first positioning groove.

4. A fabricated spread footing template as claimed in claim 3, wherein, A plurality of second positioning grooves are also arranged on the pedestal on both sides of the first positioning groove, and the end of the side template is coincided with the inner side of the corresponding second positioning groove; and a second positioning plate is inserted into the second positioning groove.

5. A fabricated spread footing template as claimed in claim 4, wherein, The length of the two side templates of the secondary component template is consistent with the length of the third template, and the horizontal line of the first positioning groove and the second positioning groove distributed along the length direction of the pedestal is parallel to the length direction of the pedestal.

6. A fabricated spread footing template according to claim 1, wherein, A plurality of limiting steel wire ropes are also connected between the first template and the second template.

7. A fabricated spread footing template according to claim 1, wherein, The rotatable connection between the first template and the hoisting assembly, the first template and the second template, and the second template and the third template is realized through a plurality of evenly distributed hinges.

8. A fabricated spread footing template according to claim 1, wherein, The side end outer surface of the first template and the second template is fixedly connected with a locking side plate, a plurality of locking bolt holes are arranged on the locking side plate, and a set angle is formed between the locking side plate and the first template or the second template.

9. A fabricated spread footing template according to claim 1, wherein, The main component U-shaped rib and the secondary component U-shaped rib exposed outside the template are wrapped with a film for protection.

10. A method of constructing a fabricated extended foundation template as claimed in any one of claims 1 to 9, wherein, The specific steps include: According to the extended basic specification, the main component template, the secondary component template and the positioning template with a set size are selected; After the main component reinforcement cage is completed, the main component template is installed, the third template is installed outside the main component reinforcement cage, the main component U-shaped rib is connected with the main component reinforcement cage through the side hole of the third template, the second template is turned up, a plurality of second templates are butted, the first template is turned up, and a plurality of first templates are butted; When the main component reinforcement cage is bound, the secondary component template is installed, the secondary component reinforcement cage is bound, the secondary component U-shaped rib is connected with the secondary component reinforcement cage through the side hole of the side template, the U-shaped rib extending out of the template is wrapped with a film, and the positioning template is installed, and then the concrete is poured; After maintenance, the positioning template and the positioning plate are removed, the side template without the side hole is removed, the side template with the side hole is moved to the main component template, the secondary component is lifted away, the side template with the side hole is removed, and then the first template, the second template and the third template are sequentially removed. ​

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