Telescopic formwork

Abstract

The utility model relates to the technical field of formwork erection, and provides a telescopic formwork which comprises a plurality of vertical rods, a plurality of transverse rods, a plurality of inner inserting rods and a plurality of connecting plates. A plurality of vertical rods are arranged at intervals, a plurality of cross rods are arranged between every two adjacent vertical rods, a plurality of cross rods are also arranged outside the two outermost vertical rods of the formwork, and the cross rods are detachably connected with the vertical rods; inner insertion rods are inserted into at least one ends of the at least two vertical rods respectively, and the inner insertion rods can stretch out and draw back in the corresponding vertical rods; the connecting plates are arranged on the periphery of the mold frame, the connecting plates located on the upper side and the lower side of the mold frame are connected to the ends of the inner inserting rods or the ends of the vertical rods, and the connecting plates located on the left side and the right side of the mold frame are connected to the ends of the transverse rods on the corresponding sides. The overall height of the formwork can be adjusted, the formwork can adapt to building components of different heights or building layer heights, material consumption is reduced, the single formwork does not need to be disassembled as a whole, overall carrying and mounting can be achieved, and the erecting efficiency of the formwork is high.

Description

Technical Field

[0001] The present application relates to the technical field of formwork erection, and further to a retractable formwork. Background Art

[0002] At present, the non-removal formwork does not require a complex support system, and the formwork does not need to be removed, which greatly simplifies the construction process, improves work efficiency, and reduces construction costs. The existing formwork that supports the non-removal formwork needs to install secondary and primary slats when setting up, and the installation process of primary and secondary slats is cumbersome and time-consuming, and the efficiency is not high. In addition, in order to match the building module requirements, the primary and secondary slats need to be cut on site, which increases material consumption, reduces the reusability of materials, and further reduces the efficiency of formwork erection.

[0003] Therefore, there is an urgent need in the market for a formwork that can not only improve the efficiency of formwork erection, reduce material consumption, but also adjust the height to adapt to building components or building storey heights of different heights. Utility Model Content

[0004] In order to solve the above problems, the present application provides a retractable formwork with ingenious design and simple structure. The overall height of the formwork is adjustable, which can adapt to building components or building storeys of different heights, reduces material consumption, and a single formwork does not need to be disassembled as a whole, and can be transported and installed as a whole. The formwork erection efficiency is high. The technical solutions adopted in the present application are as follows:

[0005] A telescopic mold frame comprises: a plurality of vertical rods, a plurality of horizontal rods, a plurality of inner insert rods and a plurality of connecting plates;

[0006] A plurality of the vertical bars are arranged at intervals, a plurality of the cross bars are arranged between two adjacent vertical bars, and a plurality of the cross bars are also arranged outside the two outermost vertical bars of the mold frame, and the cross bars are detachably connected to the vertical bars;

[0007] At least one end of at least two of the vertical rods is respectively provided with the inner rod, and the inner rod can be extended and retracted in the corresponding vertical rod;

[0008] Several connecting plates are respectively arranged around the mold frame. The connecting plates located on the upper and lower sides of the mold frame are connected to the ends of the inner insert rods or the ends of the vertical rods. The connecting plates located on the left and right sides of the mold frame are connected to the ends of the cross rods on the corresponding sides.

[0009] In this application, a single formwork can be pre-assembled as a whole and can be transported as a whole to the next work surface. The single formwork does not need to be disassembled as a whole, and the formwork erection efficiency is high. By extending and retracting the inner rod in the vertical rod, the overall height of the formwork can be adjusted to adapt to building components or building floor heights of different heights, thereby reducing material consumption.

[0010] In some embodiments, the vertical rod and the inner rod are respectively provided with through holes spaced apart in the vertical direction, the through holes of the inner rod correspond to part of the through holes of the vertical rod, and the through holes are used for passing the tension screws.

[0011] By setting the through holes on the vertical rod and the inserted rod, compared to setting the through holes on the cross rod, the vertical spacing between two adjacent through holes can be smaller than the spacing between two adjacent cross rods, that is, the through holes can be denser to meet the spacing requirements or density requirements for the tension screws.

[0012] In some embodiments, the spacing between the perforations is 100 mm to correspond to the basic module.

[0013] At present, the value of the basic modulus is stipulated to be 100mm, which means that the building height or component size generally changes in multiples of 100mm. The spacing of the penetration holes is consistent with the basic modulus, so that the inserted rod can be extended and retracted in the vertical rod with a stroke of multiples of 100mm. While ensuring the penetration of the tension screw, it can also adapt to building components or building heights of different heights. Compared with the spacing of 50mm for the penetration holes, the spacing of 100mm for the penetration holes can reduce the number of penetration holes, save the cost of opening penetration holes, and avoid excessive weakening of the strength of the vertical rod.

[0014] In some embodiments, all the inner rods are respectively inserted into the same end of the corresponding vertical rods, and the end of the vertical rods not provided with the inner rods is provided with the connecting plate. The inner rods are provided on only one side of the upper side and the lower side of the mold frame, which can save the installation time and height adjustment time of the inner rods compared to providing the inner rods on both the upper and lower sides of the mold frame.

[0015] In some embodiments, all of the inner insertion rods are respectively inserted into the upper ends of the corresponding vertical rods.

[0016] In some embodiments, the connecting plate is fixed to the corresponding cross bar, the vertical bar and the inner rod by countersunk bolts;

[0017] The connecting plates are provided with connecting holes, the connecting holes of the connecting plates on the upper and lower sides of the mold frame correspond to each other, and the connecting holes of the connecting plates on the left and right sides of the mold frame correspond to each other.

[0018] By fixing the connection plate with countersunk bolts, the surface of the connection plate can be made flat and free of protrusions; and by setting connection holes, multiple formwork frames can be spliced. When multiple formwork frames are spliced, the connection plates adjacent to the left and right or the top and bottom can be connected and fit together by inserting connection components such as pins or bolts in the connection holes.

[0019] In some embodiments, both ends of the connecting plate disposed at the end of the vertical rod where the inner rod is not disposed are connected to corresponding ends of the connecting plates on the left and right sides of the mold frame through angle pieces, respectively.

[0020] The ends of the two intersecting connecting plates are fixed together by corner fittings, which improves the overall strength and stability of the formwork and also enables the non-disassembly formwork to be evenly stressed.

[0021] In some embodiments, the vertical rod, the horizontal rod, and the inner rod are all made of aluminum profiles, which are high in strength, light in weight, not prone to corrosion, durable, and easy to produce and process.

[0022] In some embodiments, the cross bar and the inner insert bar are of the same model. The cross bar and the inner insert bar are made of the same model of aluminum profiles, which can reduce the number of specifications of the rods in the mold frame.

[0023] In some embodiments, the vertical rod, the horizontal rod and the connecting plate are flush with one side corresponding to the inner side of the mold frame, and the vertical rod, the horizontal rod and the connecting plate are flush with one side corresponding to the outer side of the mold frame.

[0024] The vertical bars, horizontal bars and connecting plates are flush with each other on the side corresponding to the inner side of the formwork, and the vertical bars, horizontal bars and connecting plates are flush with each other on the side corresponding to the outer side of the formwork. This makes it unnecessary to consider which side of the formwork is the inner or outer side when erecting the formwork, thereby improving the installation efficiency of the formwork. At the same time, this allows the vertical bars, horizontal bars and connecting plates to be in contact with the non-dismantling formwork, so that the non-dismantling formwork is evenly stressed, thereby improving the casting quality.

[0025] The retractable mold frame provided in the present application has at least one of the following beneficial effects:

[0026] 1. The present application provides a retractable formwork, in which a single formwork can be pre-assembled as a whole and can be carried as a whole to the next work surface. The single formwork does not need to be disassembled as a whole, and the formwork erection efficiency is high. By retracting the inner rod in the vertical rod, the overall height of the formwork can be adjusted, which can adapt to building components or building storeys of different heights, thereby reducing material consumption.

[0027] 2. The present application provides a retractable mold frame, in which the through holes are arranged on the vertical rods and the inner rods. Compared with the through holes being arranged on the cross rods, the vertical spacing between two vertically adjacent through holes can be smaller than the spacing between two vertically adjacent cross rods, that is, the through holes can be arranged more densely to meet the spacing requirement or density requirement of the tension screws;

[0028] 3. The present application provides a retractable formwork, the basic modulus of which is currently specified as 100mm, that is, the building height or component size generally changes in multiples of 100mm, and the spacing of the through holes is consistent with the basic modulus, so that the inner rod can be retracted in the vertical rod with a stroke of multiples of 100mm, while ensuring the insertion of the tension screw rod, it can also adapt to building components or building heights of different heights; compared with the spacing of the through holes of 50mm, the spacing of the through holes of 100mm can reduce the number of through holes, save the cost of opening the through holes, and avoid excessive weakening of the strength of the vertical rod;

[0029] 4. The present application provides a retractable mold frame, in which the inner rod is only arranged on one side of the upper side and the lower side of the mold frame. Compared with the case in which the inner rod is arranged on both the upper and lower sides of the mold frame, the installation time of the inner rod and the height adjustment time of the inner rod can be saved;

[0030] 5. The present application provides a retractable formwork, which uses countersunk bolts to fix the connecting plates, so that the surface of the connecting plates can be flat and free of protrusions; and by setting connecting holes, multiple formworks can be spliced. When multiple formworks are spliced, the connecting plates adjacent to the left and right or the upper and lower parts can be connected and fit together by inserting connecting components such as pins or bolts in the connecting holes;

[0031] 6. The present application provides a retractable formwork, which uses corner pieces to fix the ends of two intersecting connecting plates together, thereby improving the overall strength and stability of the formwork, and also enables the non-disassembly formwork to be evenly stressed;

[0032] 7. The present application provides a retractable formwork, wherein the aluminum profile has high strength, light weight, is not prone to corrosion, is durable, and is easy to produce and process;

[0033] 8. The present application provides a retractable formwork, wherein the crossbar and the inner insert rod adopt the same type of aluminum profile, which can reduce the number of specifications of the rods in the formwork;

[0034] 9. The present application provides a retractable formwork, in which the vertical bars, horizontal bars and connecting plates are flush with the side corresponding to the inner side of the formwork, and the vertical bars, horizontal bars and connecting plates are flush with the side corresponding to the outer side of the formwork. This makes it unnecessary to consider which side of the formwork is the inner or outer side when erecting the formwork, thereby improving the installation efficiency of the formwork. At the same time, this allows the vertical bars, horizontal bars and connecting plates to be in contact with the non-dismantling formwork, so that the non-dismantling formwork is evenly stressed, thereby improving the casting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following will further explain the above characteristics, technical features, advantages and implementation methods of a retractable formwork in a clear and understandable manner with reference to the accompanying drawings:

[0036] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0037] Figure 2 yes Figure 1 A magnified view of part A;

[0038] Figure 3 yes Figure 1 A magnified view of part B;

[0039] Figure 4 is a schematic diagram of a cross section of a vertical rod in an embodiment of the present application;

[0040] Figure 5 is a schematic diagram of a cross section of a cross bar / inserted rod in an embodiment of the present application;

[0041] Figure 6 This is the state in which the inner rod is inserted into the vertical rod in the embodiment of the present application;

[0042] Figure 7 is a schematic structural diagram of a vertical rod including a first section and a second section in an embodiment of the present application;

[0043] Figure 8 yes Figure 7 An exploded schematic diagram of an embodiment;

[0044] Fig. 9 It is a cross section of the first section, the second section and the inner insertion rod in the embodiment of the present application.

[0045] Description of Figure Numbers:

[0046] Vertical rod 1, horizontal rod 2, inner rod 3, connecting plate 4, through hole 5, countersunk bolt 6, connecting hole 7, angle piece 8, hexagon socket bolt 9, T-nut 10, built-in connecting piece 11, elastic nut 12, T-bolt 13, fixing wrench 14, cavity 15, groove 16, first section 17, second section 18, slot 19, connecting piece 20. DETAILED DESCRIPTION

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0048] In order to simplify the drawings, only the parts related to the present application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0049] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0050] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] refer to Figure 1-Figure 6 , the present application provides a retractable formwork, comprising: a plurality of vertical rods 1, a plurality of horizontal rods 2, a plurality of inner insert rods 3 and a plurality of connecting plates 4;

[0053] A plurality of vertical rods 1 are arranged at intervals, a plurality of cross rods 2 are arranged between two adjacent vertical rods 1, a plurality of cross rods 2 are also arranged outside the two outermost vertical rods 1 of the mold frame, and the cross rods 2 are detachably connected to the vertical rods 1; an inner rod 3 is respectively inserted into at least one end of at least two vertical rods 1, and the inner rod 3 can be extended and retracted in the corresponding vertical rod 1; a plurality of connecting plates 4 are respectively arranged around the mold frame, the connecting plates 4 located on the upper and lower sides of the mold frame are connected to the end of the inner rod 3 or the end of the vertical rod 1, and the connecting plates 4 located on the left and right sides of the mold frame are connected to the end of the cross rod 2 on the corresponding side.

[0054] In this embodiment, a single formwork can be pre-assembled as a whole and can be transported as a whole to the next work surface. The single formwork does not need to be disassembled as a whole, and the formwork erection efficiency is high. By extending and retracting the inner rod 3 in the vertical rod 1, the overall height of the formwork can be adjusted to adapt to building components or building storeys of different heights, thereby reducing material consumption.

[0055] refer to Figure 1-Figure 3In one embodiment, the vertical rod 1 and the inner rod 3 are respectively provided with through holes 5 at intervals along the vertical direction, and the through holes 5 of the inner rod 3 correspond to some of the through holes 5 of the vertical rod 1, and the through holes 5 are used for the through-holes of the tension screws.

[0056] It can be understood that by setting the through holes 5 on the vertical rod 1 and the inserted rod 3, relative to setting the through holes 5 on the cross rod 2, the vertical spacing between two adjacent through holes 5 can be smaller than the spacing between two adjacent cross rods 2, that is, the through holes 5 can be denser to meet the spacing requirements or density requirements for setting the tension screws.

[0057] In one embodiment, the spacing of the through holes 5 is 100 mm so as to correspond to the basic module.

[0058] It is worth noting that the value of the basic modulus is specified to be 100mm, that is, the building storey height or component size generally changes in multiples of 100mm, and the spacing of the through holes 5 is consistent with the basic modulus, so that the inserted rod 3 can be extended and retracted in the vertical rod 1 with a stroke of multiples of 100mm, while ensuring the penetration of the tension screws, it can also adapt to building components or building storey heights of different heights; relative to the spacing of the through holes 5 of 50mm, the spacing of the through holes 5 of 100mm can reduce the number of the through holes 5, save the cost of opening the through holes 5, and avoid excessive weakening of the strength of the vertical rod 1.

[0059] refer to Figure 1 In one embodiment, all the inner rods 3 are respectively inserted into the same end of the corresponding vertical rods 1, and the end of the vertical rod 1 without the inner rod 3 is provided with a connecting plate 4. It can be understood that, by only providing the inner rod 3 on one side of the upper side and the lower side of the mold frame, compared with providing the inner rod 3 on both the upper and lower sides of the mold frame, the installation time of the inner rod 3 and the height adjustment time of the inner rod 3 can be saved.

[0060] refer to Figure 1 In one embodiment, all the inner rods 3 are inserted into the upper ends of the corresponding vertical rods 1. It is worth noting that the inner rods 3 are inserted into the upper ends of the vertical rods 1. When the telescopic length of the inner rods 3 needs to be adjusted, it is only necessary to screw the fixing wrench 14 and loosen the T-bolt 13 to adjust the telescopic length of the inner rods 3, which is convenient and quick; if the inner rods 3 are inserted into the lower ends of the vertical rods 1, the inner rods 3 bear the gravity of the vertical rods 1 and other components. When adjusting the telescopic length of the inner rods 3, the vertical rods 1 need to be lifted up or supported, which is not convenient for adjusting the telescopic length of the inner rods 3;

[0061] refer to Figure 1-Figure 3In one embodiment, the connecting plate 4 is fixed to the corresponding cross bar 2, vertical bar 1 and inner rod 3 by countersunk bolts 6 (or flat machine bolts); the connecting plate 4 is provided with connecting holes 7, and the connecting holes 7 of the connecting plates 4 on the upper and lower sides of the mold frame correspond to each other, and the connecting holes 7 of the connecting plates 4 on the left and right sides of the mold frame correspond to each other.

[0062] In this embodiment, the countersunk bolts 6 are used to fix the connection plates 4, so that the surface of the connection plates 4 can be flat and free of protrusions; and the connection holes 7 are provided so that multiple mold frames can be spliced. When multiple mold frames are spliced, the connection plates 4 adjacent to the left and right or the top and bottom can be connected and fit together by inserting connection components such as pins or bolts in the connection holes 7.

[0063] refer to Figure 1 , Figure 3 In one embodiment, the two ends of the connecting plate 4 provided at the end of the vertical rod 1 where the inner rod 3 is not provided are respectively connected to the corresponding ends of the connecting plates 4 on the left and right sides of the formwork through the angle pieces 8. It can be understood that the ends of the two intersecting connecting plates 4 are fixed together by the angle pieces 8, which improves the overall strength and overall stability of the formwork, and also enables the non-disassembly formwork to be evenly stressed.

[0064] In one embodiment, the vertical rod 1, the horizontal rod 2, and the inner rod 3 are all made of aluminum profiles. Aluminum profiles have high strength, light weight, are not easy to corrode, are durable, and are easy to produce and process. In other embodiments, the rods can be one or more of steel profiles, magnesium-aluminum alloy profiles, or stainless steel profiles.

[0065] refer to Figure 5 , Figure 6 In one embodiment, the cross bar 2 and the inner rod 3 are of the same type. It is understandable that the cross bar 2 and the inner rod 3 are made of the same type of aluminum profile, which can reduce the number of specifications of the rods in the mold frame.

[0066] In one embodiment, the vertical rod 1, the horizontal rod 2 and the connecting plate 4 are flush with one side corresponding to the inner side of the formwork, and the vertical rod 1, the horizontal rod 2 and the connecting plate 4 are flush with one side corresponding to the outer side of the formwork.

[0067] It is worth noting that the vertical rod 1, the horizontal rod 2 and the connecting plate 4 are flush with each other on the side corresponding to the inner side of the formwork, and the vertical rod 1, the horizontal rod 2 and the connecting plate 4 are also flush with each other on the side corresponding to the outer side of the formwork. This makes it unnecessary to consider which side of the formwork is the inner or outer side when erecting the formwork, thereby improving the installation efficiency of the formwork. At the same time, this allows the vertical rod 1, the horizontal rod 2 and the connecting plate 4 to all be in contact with the non-disassembly formwork, so that the non-disassembly formwork is evenly stressed, thereby improving the casting quality.

[0068] Combine the following Figure 1-Figure 6, introduce the connection method between the components in the mold frame. The cross bar 2 and the inserted rod 3 are both based on the QY-8-4040B profile, and the vertical bar 1 is based on the P8-SH4780 profile. When the vertical bar 1 is cross-connected or right-angled with the cross bar 2, the upper and lower grooves 16 at one end where the cross bar 2 is connected to the vertical bar 1 are provided with built-in connectors 11, and the grooves 16 of the cross bar 2 are provided with installation process holes, and the built-in connectors 11 are stuck in the installation process holes, and the built-in connectors 11 are provided with stepped holes, and the grooves 16 of the vertical bar 1 are provided with T-nuts 10 (which can also be elastic nuts 12, spring nuts, slider nuts, flange nuts, etc.), insert the hexagon socket bolts 9 (which can also be other types of bolts) into the stepped holes of the built-in connectors 11 and tighten them with the T-nuts 10, and the cross bar 2 can be connected to the vertical bar 1. When the inner rod 3 is connected to the vertical rod 1, the inner rod 3 is inserted into the cavity 15 of the vertical rod 1, and a through hole connected to the cavity 15 is opened in the groove 16 of the vertical rod 1, and a T-bolt 13 (or a cylindrical head bolt, etc.) is passed through the through hole, and an elastic nut 12 (or a T-nut 10, a spring nut, a slider nut, a flange nut, etc.) is provided in the groove 16 of the inner rod 3. The T-bolt 13 and the elastic nut 12 are tightened by using a fixing wrench 14 to fix the inner rod 3 and the vertical rod 1 relatively. After loosening the T-bolt 13 by using the fixing wrench 14, the telescopic length of the inner rod 3 can be adjusted to adjust the overall height of the template. The connection method between the cross bar 2 and the vertical rod 1 and the connection method between the inner rod 3 and the vertical rod 1 introduced above are all existing technologies, which are generally used in the connection between profiles and will not be repeated here.

[0069] refer to Figure 7-Figure 9 In one embodiment, the vertical rod 1 includes a first section 17 and a second section 18. The first section 17 and the second section 18 are aluminum profiles of different types. A slot 19 is provided at the adjacent ends of the first section 17 and the second section 18. The first section 17 and the second section 18 are connected by a dumbbell-shaped connector 20 inserted into the slot 19. The first section 17 has a cavity 15, and the inner rod 3 is suitable for telescoping in the cavity 15. The cross section of the second section 18 is not completely hollow, but has a core. The inner rod 3 cannot telescope in the second section 18. The cross-sectional strength of the second section 18 is greater than that of the first section 17, which is conducive to improving the compressive stability of the vertical rod 1, and thus improving the overall stability of the entire formwork.

[0070] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A retractable formwork, characterized in that: include: A plurality of vertical rods, a plurality of horizontal rods, a plurality of inner rods and a plurality of connecting plates; A plurality of the vertical bars are arranged at intervals, a plurality of the cross bars are arranged between two adjacent vertical bars, and a plurality of the cross bars are also arranged outside the two outermost vertical bars of the mold frame, and the cross bars are detachably connected to the vertical bars; At least one end of at least two of the vertical rods is respectively provided with the inner rod, and the inner rod can be extended and retracted in the corresponding vertical rod; Several connecting plates are respectively arranged around the mold frame. The connecting plates located on the upper and lower sides of the mold frame are connected to the ends of the inner insert rods or the ends of the vertical rods. The connecting plates located on the left and right sides of the mold frame are connected to the ends of the cross rods on the corresponding sides.

2. A retractable formwork according to claim 1, characterized in that: The vertical rod and the inner rod are respectively provided with through holes at intervals along the vertical direction. The through holes of the inner rod correspond to part of the through holes of the vertical rod, and the through holes are used for the through-holes of the tensioning screws.

3. A retractable formwork according to claim 2, characterized in that: The spacing between the perforated holes is 100 mm so as to correspond to the basic module.

4. A retractable formwork according to claim 1, characterized in that: All the inner insertion rods are respectively inserted into the same end of the corresponding vertical rods, and the connecting plate is provided at one end of the vertical rod where the inner insertion rod is not provided.

5. A retractable formwork according to claim 4, characterized in that: All the inner insertion rods are respectively inserted into the upper ends of the corresponding vertical rods.

6. A retractable formwork according to claim 4, characterized in that: The connecting plate is fixed to the corresponding cross bar, the vertical bar and the inner rod by countersunk bolts; The connecting plates are provided with connecting holes, the connecting holes of the connecting plates on the upper and lower sides of the mold frame correspond to each other, and the connecting holes of the connecting plates on the left and right sides of the mold frame correspond to each other.

7. A retractable formwork according to claim 4, characterized in that: The two ends of the connecting plate arranged at the end of the vertical rod where the inner insert rod is not arranged are respectively connected to the corresponding ends of the connecting plates on the left and right sides of the mold frame through angle pieces.

8. A retractable formwork according to any one of claims 1 to 7, characterized in that: The vertical rod, the horizontal rod and the inner rod are all made of aluminum profiles.

9. A retractable formwork according to claim 8, characterized in that: The cross bar and the inner inserting rod are of the same model.

10. A retractable formwork according to claim 8, characterized in that: The vertical rod, the horizontal rod and the connecting plate are flush with one side corresponding to the inner side of the mold frame, and the vertical rod, the horizontal rod and the connecting plate are flush with one side corresponding to the outer side of the mold frame.

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