Hollow prefabricated component and forming method thereof

Abstract

The present invention belongs to the technical field of prefabricated components for construction, and relates to a hollow prefabricated component and a forming method thereof. The present invention comprises the following steps: step A, inserting a core mold into a steel cage and fixing the core mold inside the steel cage to form a core mold steel cage, step B, moving the core mold steel cage into a mold groove of a pile mold and fixing it, step C, pouring concrete into the mold groove and vibrating it, and forming a primary prefabricated component after curing, and step D, removing the pile mold from the surface of the primary prefabricated component, and then removing the core mold inside the primary prefabricated component to obtain a hollow prefabricated component. The present invention has a simple manufacturing process, saves the centrifuge equipment, and can prefabricate hollow prefabricated piles without a centrifugal process.

Description

Technical Field

[0001] The invention belongs to the technical field of prefabricated components for buildings and relates to a hollow prefabricated component and a molding method thereof. Background Art

[0002] Reinforced concrete precast piles are prefabricated in a prefabricated component processing plant, and after being cured and reaching the designed strength, they are transported to the construction site, driven into the soil with a pile driver, and then the cap beam (slab) foundation is poured on the top of the pile. When the cap foundation is met, the original solid precast piles are made into hollow piles. Since the area where the steel bars are arranged is still covered with concrete, the overall bearing capacity will not be reduced due to the hollowness. Therefore, compared with solid piles of the same diameter, hollow piles, on the one hand, ensure the bearing capacity requirements, and on the other hand, save a lot of concrete. At present, they have been widely used in engineering practice.

[0003] The current hollow pile forming method generally adopts centrifugal process, cast-in-place process and other methods. The centrifugal process is a hollow cylindrical slender concrete prefabricated component. The concrete material needs to be placed in a mold and then centrifuged on a centrifuge. The hollow structure can only be circular and cannot be customized according to actual needs. The cast-in-place process needs to be used on the construction site, resulting in a long construction time, and it is also easily restricted by the construction environment, affecting the progress of the construction. Summary of the invention

[0004] The object of the present invention is to provide a hollow prefabricated component and a forming method thereof in view of the above problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for forming a hollow prefabricated component comprises the following steps:

[0007] Step A, inserting a core mold into the steel cage and fixing the core mold inside the steel cage to form a core mold steel cage,

[0008] Step B, move the core mold steel cage into the mold groove of the pile mold and fix it,

[0009] Step C, pouring concrete into the mold, vibrating it, and curing it to form a primary prefabricated component,

[0010] Step D, removing the pile mold from the surface of the primary prefabricated component, and then removing the core mold inside the primary prefabricated component to obtain a hollow prefabricated component.

[0011] In the above-mentioned hollow prefabricated component forming method, in step A, tensioning components are connected to both ends of the steel cage to fix the core mold inside the steel cage. In step B, after the core mold steel cage is fixed in the mold groove, the steel cage is tensioned.

[0012] In the above-mentioned hollow prefabricated component forming method, the core mold includes a hollow tube 1. In step D, after the pile mold is removed from the surface of the primary prefabricated component, the hollow tube 1 is pulled out from the interior of the primary prefabricated component to obtain a hollow prefabricated component.

[0013] In the above-mentioned hollow prefabricated component forming method, the core mold includes a hollow tube 1 and an air bag 2 placed inside the hollow tube 1. In step B, when the core mold steel cage is moved to the mold groove of the pile mold and fixed, the air bag 2 is inflated to fill the inside of the hollow tube 1. In step D, when the pile mold is removed from the surface of the primary prefabricated component, the air bag 2 is deflated and pulled out of the hollow tube 1, and the hollow tube 1 is retained in the primary prefabricated component to obtain a hollow prefabricated component.

[0014] In the above-mentioned hollow prefabricated component forming method, the core mold includes an air bag 2 and a plurality of steel plates 3 , and the plurality of steel plates 3 surround the air bag 2 .

[0015] In the above-mentioned hollow prefabricated component forming method, the airbag 2 is covered with a rubber sleeve 2a, and the plurality of steel plates 3 surround the rubber sleeve 2a. The cross section of the steel plates 3 is arc-shaped or L-shaped.

[0016] In the above-mentioned hollow prefabricated component forming method, the core mold includes an outer shaping sleeve 4 and an airbag component 5 placed in the outer shaping sleeve 4. When the airbag component 5 is inflated, the outer shaping sleeve 4 is stretched open under the action of the airbag component 5. When the airbag component 5 is deflated, the outer shaping sleeve 4 shrinks inward due to the disappearance of the action of the airbag component 5.

[0017] In the above-mentioned hollow prefabricated component forming method, the airbag assembly 5 includes an airbag 2 and a plurality of shaping plates 6 , and the plurality of shaping plates 6 surround the airbag 2 .

[0018] In the above-mentioned hollow prefabricated component forming method, when the airbag 2 is inflated, the outer wall of the shaping plate 6 is tightly connected to the inner wall of the outer shaping sleeve 4, and the inner wall of the shaping plate 6 is in close contact with the outer wall of the airbag 2.

[0019] In the above-mentioned hollow prefabricated component forming method, the outer wall of the shaping plate 6 is L-shaped or arc-shaped, and a cushion strip 7 is also provided on the inner wall of the shaping plate 6. When the airbag 2 is inflated, the inner wall of the cushion strip 7 is in close contact with the outer wall of the airbag.

[0020] In the above-mentioned hollow prefabricated component forming method, the airbag assembly 5 includes a plurality of airbags 2 and an inner positioning tube 8. The plurality of airbags 2 surround the outside of the inner positioning tube 8. When the airbags 2 are inflated, the plurality of airbags 2 are in close contact with the inner wall of the outer shaping sleeve 4 and the outer wall of the inner positioning tube 8 at the same time, thereby expanding the outer shaping sleeve 4. When the airbags 2 are deflated, the outer shaping sleeve 4 contracts inward.

[0021] In the above-mentioned hollow prefabricated component forming method, there are at least three air bags which are evenly spaced and arranged around the inner positioning tube 8.

[0022] In the above-mentioned hollow prefabricated component forming method, there are four airbags, and four support plates 9 are evenly spaced on the outer wall of the inner positioning tube 8, and an airbag 2 is provided between every two adjacent support plates 9.

[0023] In the above-mentioned hollow prefabricated component forming method, the core mold includes a frame-shaped mold structure 10 with an opening at the lower end, and two mold movable plates 11 that can close the opening of the mold structure are hinged at the bottom of the mold structure 10. When the two mold movable plates 11 close the bottom of the mold structure 10, the two mold movable plates 11 can move closer to each other under the action of external force, thereby pulling the two sides of the mold structure 10 inward.

[0024] In the above-mentioned hollow prefabricated component forming method, the mold core includes at least two forming frames 12, and a wedge block 13 is hinged between every two adjacent forming frames 12. The wedge block 13 is connected to a telescopic mechanism 14 that can push the wedge block 13 to reciprocate in a straight line. When the wedge block 13 moves outward, the forming frame 12 is in close contact with the wedge block 13 to form a closed frame structure. When the wedge block 13 moves inward, the wedge block 13 is separated from the forming frame 12.

[0025] A hollow prefabricated component is manufactured according to the above-mentioned hollow prefabricated component molding method.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] 1. The manufacturing process is simple, eliminating the need for centrifuge equipment, and hollow prefabricated piles can be prefabricated without the centrifugal process.

[0028] 2. Hollow prefabricated piles with circular, rectangular or other shapes in the hollow part can be produced according to actual needs.

[0029] 3. The core mold structure is reasonably designed, low cost, and suitable for promotion and application.

[0030] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of placing the steel cage of the present invention into the mold groove.

[0032] Figure 2 yes Figure 1 Schematic diagram of the other direction.

[0033] Figure 3 It is a structural schematic diagram of the core mold of the present invention.

[0034] Figure 4 It is a structural schematic diagram of the core mold of the present invention.

[0035] Figure 5 It is a structural schematic diagram of another core mold of the present invention.

[0036] Figure 6 It is a structural schematic diagram of another core mold of the present invention.

[0037] Figure 7 It is a structural schematic diagram of another core mold of the present invention.

[0038] Figure 8 It is a structural schematic diagram of another core mold of the present invention.

[0039] Fig. 9 It is a structural schematic diagram of another core mold of the present invention.

[0040] Fig.10 It is a structural schematic diagram of another core mold of the present invention.

[0041] Fig.11 It is a schematic diagram of the end of a reinforcement cage without end plates.

[0042] Fig.12 This is a schematic diagram of the end of the reinforcement cage with end plates.

[0043] Fig.13 It is a schematic diagram of a reinforcement cage without end plates.

[0044] Fig.14 It is a structural schematic diagram of another core mold of the present invention.

[0045] In the figure: hollow tube 1 airbag 2 rubber sleeve 2a steel plate 3 outer shaping sleeve 4 airbag assembly 5 shaping plate 6 cushion strip 7 inner positioning tube 8 support plate 9 mold structure 10 mold movable plate 11 shaping frame 12 wedge block 13 telescopic mechanism 14. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0047] Example 1

[0048] The present invention provides a method for forming a hollow prefabricated component, comprising the following steps:

[0049] Step A, inserting a core mold into the steel cage and fixing the core mold inside the steel cage to form a core mold steel cage, connecting tensioning components at both ends of the steel cage to fix the core mold inside the steel cage;

[0050] The method for making a steel cage is an existing technology, which is to first cut the steel bars into steel ends, weave the steel cage with a cage weaving machine, and then Figure 11-13 As shown, tensioning nuts 102, connecting nuts 103 or tensioning end plates 104 are put on both ends of the steel cage 101, and then the steel piers at both ends of the steel cage are processed with a pier machine. The steel cage with end plates is usually connected to the tensioning end plates, and the steel cage without end plates is usually connected to the tensioning nuts and connecting nuts.

[0051] Specifically, the shape of the steel cage is determined according to the hollow prefabricated component to be manufactured. For example, if the cross-section of the hollow prefabricated component is a rectangular structure, the cross-section of the steel cage is also generally a rectangular structure to adapt to its manufacturing requirements, and there is an axially extending hollow cavity in the middle of the steel cage.

[0052] Before the steel cage is moved into the mold groove, a core mold approximately the same length as the steel cage needs to be inserted into the hollow cavity of the steel cage, and then a tensioning assembly is installed at both ends of the steel cage. The tensioning machine for tensioning the steel cage is an existing technology. Specifically, the tensioning plate in the tensioning assembly is installed on the steel cage, and the steel cage has a connecting piece accessory. The connecting piece accessory is a tensioning nut, a connecting nut or a tensioning end plate as described above. The tensioning plate is provided with a mounting hole, and the tensioning plate can be connected to the connecting piece accessory on the steel cage through the mounting hole.

[0053] Before installing the tensioning assembly, corner guards can be installed at the ends of the steel cage. The corner guards can be installed at one end or at both ends of the steel cage according to needs.

[0054] According to a preferred embodiment, before inserting the core mold into the hollow cavity of the steel cage, a cylindrical object is first placed at the end of the steel cage, and the cylindrical object can slide and move with the core mold into the hollow cavity of the steel cage as the core mold is inserted, until the core mold is inserted into a preset position; the cylindrical object can be one or more, as long as it is convenient for the core mold to be inserted into the steel cage, the cylindrical object not only facilitates the insertion of the core mold into the hollow cavity of the steel cage, but also supports the core mold, and other hard objects can also be used to replace the cylindrical object after the core mold is inserted into the predetermined position; for example, the cylindrical object can be a steel pipe, and the diameter of the steel pipe is smaller than the width of the hollow cavity of the steel cage;

[0055] Step B, Combine Figure 1-Figure 2 As shown, the core mold steel cage is moved to the mold groove of the pile mold and fixed. After the core mold steel cage is fixed in the mold groove 105, the steel cage 101 is tensioned;

[0056] The tensioning process is performed by a tensioning machine, which is a prior art and will not be described in detail here. The tensioning assembly in this embodiment includes a tensioning plate, a tensioning rod and a connector, one end of the tensioning rod is connected to the tensioning plate, and the other end of the tensioning rod is connected to the connector or directly connected to the tensioning device, or another tensioning rod can be used with one end connected to the connector, and the other end of the tensioning rod is connected to the tensioning device, and the tensioning plate is directly pulled by the tensioning device to generate pre-tensioning force on the steel bars in the steel cage, or the tensioning device directly acts on the tensioning assembly to generate pre-tensioning force on the steel bars in the steel cage;

[0057] It should be noted that the core mold steel cage can be a single core mold steel cage, or multiple core mold steel cages can be connected by a connector to form a series core mold steel cage structure;

[0058] The connection of multiple core mold steel cages, specifically, after placing several core mold steel cages in the mold groove, each two adjacent tensioning components of the multiple core mold steel cages are connected by a connector, so that the multiple core mold steel cages form a series structure;

[0059] Step C, pouring concrete into the mold groove and vibrating it, and then curing it to form a primary prefabricated component. The vibration can be done by vibrating while spreading the concrete to make the concrete fully contact with the steel cage and compact it, or by inserting a vibrating rod into the concrete after spreading the concrete to vibrate it so that the concrete is fully contacted with the steel cage and the concrete is compacted;

[0060] Before curing, the concrete needs to be smoothed, which can be done manually or by using a smoothing machine or other equipment with smoothing function to smooth the uneven areas of the concrete surface;

[0061] When curing concrete, steam can be introduced into the bottom of the mold groove for curing, or steam can be introduced into the side mold of the mold groove, and the steam introduction time and corresponding temperature can be set; or it can be left to stand for curing;

[0062] Step D, removing the pile mold from the surface of the primary prefabricated component, and then removing the core mold inside the primary prefabricated component to obtain a hollow prefabricated component.

[0063] When demoulding the primary prefabricated component, the primary prefabricated component can be directly pulled out from the mold groove by using a lifting device, or the side mold can be directly removed; in order to facilitate demoulding, a mold release agent can be sprayed in the mold groove in advance;

[0064] If a lifting device is used for demoulding, a hanging assembly can be placed at different positions of the steel cage when the steel cage is implanted in the mold groove. After casting and forming, the hanging assembly and the primary prefabricated component form an integrated structure. The lifting device can pull the primary prefabricated component out of the mold groove through the hanging assembly.

[0065] If you want to remove the side mold directly, you can use a lifting device to lift the entire mold or mold groove and place it in the appropriate position, and then remove the side molds one by one.

[0066] After the primary prefabricated component is pulled out of the mold groove, the tensioning components on both sides thereof need to be removed together, and then the core mold is removed to form a hollow prefabricated component; if corner guards are installed at the ends of the steel cage before installing the tensioning components, the ends of the hollow prefabricated component after removing the core mold will contain corner guards, which may be 1 or 2. If there are 2 corner guards, they are located at both ends of the hollow prefabricated component respectively.

[0067] In this embodiment, if Fig.10 As shown, the core mold is a hollow steel pipe 100. To facilitate detachment, the outer surface of the steel pipe is wrapped with tape, and a hanging hole is provided inside the steel pipe for easy removal during demoulding. When using the core mold, the core mold is inserted into the steel cage 101 and positioned. After the primary prefabricated component is demoulded, a hook or other method that can be hung on the hanging hole of the core mold can be used, and then the core mold is pulled out using a tensioning device.

[0068] Example 2

[0069] This embodiment provides a method for forming a hollow prefabricated component, which is basically the same as the steps and working process of Embodiment 1, except that:

[0070] In this embodiment, if Fig.14 As shown, the core mold includes a hollow tube 1 and an air bag 2 placed inside the hollow tube 1. In step B, when the core mold steel cage is moved to the mold groove of the pile mold and fixed, the air bag 2 is inflated to fill the inside of the hollow tube 1. In step D, when the pile mold is removed from the surface of the primary prefabricated component, the air bag 2 is deflated and pulled out of the hollow tube 1, and the hollow tube 1 is retained in the primary prefabricated component to obtain a hollow prefabricated component.

[0071] It should be noted that the hollow tube in this embodiment can be a metal tube or a plastic tube. The metal tube can be a cast iron tube, a wrought iron tube, a steel tube, a sheet iron tube, etc. The plastic tube can be a PVC tube, a PPR tube, a PC tube, etc. Technical personnel in this field can select the hollow tube according to actual needs.

[0072] In step B, the airbag supports the hollow tube, and in step D, when the airbag is deflated, the airbag shrinks and is easily pulled out of the hollow tube to achieve demoulding.

[0073] Example 3

[0074] This embodiment provides a method for forming a hollow prefabricated component, which is basically the same as the steps and working process of Embodiment 1, except that:

[0075] In this embodiment, if Figure 4As shown, the core mold includes an airbag 2 and a plurality of steel plates 3. The plurality of steel plates 3 surround the airbag 2. When the airbag 2 is inflated, the airbag supports the steel plates 3. The plurality of steel plates 3 are enclosed to form a hollow structure.

[0076] The cross section of the steel plate 3 is an arc or L-shape. When the cross section of the steel plate 3 is an arc, several steel plates 3 are enclosed to form a hollow cylinder. Sealing strips, such as rubber strips, silicone strips, etc., are filled between adjacent steel plates 3 to seal the gap. When the mold is removed, the sealing strip is squeezed and deformed, and also plays a buffering role, which facilitates the extraction of the steel plate during step D. The sealing strip can be retained in the primary prefabricated component or peeled off from the primary prefabricated component. After the airbag 2 is deflated, it can be directly extracted from the steel plate 3.

[0077] When the cross section of the steel plate 3 is L-shaped, a plurality of steel plates 3 are enclosed to form a hollow rectangular structure. Similarly, sealing strips are filled between adjacent steel plates 3 .

[0078] In a preferred embodiment, the airbag 2 is covered with a rubber sleeve 2a, and the plurality of steel plates 3 surround the rubber sleeve 2a.

[0079] The role of the rubber sleeve 2a is to protect the airbag and prevent the airbag from wear and tear. It also plays a role in shaping, such as a rubber sleeve with a rectangular cross section, a round or oval rubber sleeve, etc. When the airbag is inflated, the rubber sleeve is subjected to force and then transmitted to the steel plate, so that the steel plate is positioned and extended in the shape of the rubber sleeve, thereby forming a hollow cavity. After the airbag is deflated, the airbag and the rubber sleeve shrink at the same time, and the airbag is pulled out of the steel plate, and then the steel plate is pulled out of the primary prefabricated component.

[0080] The rubber sleeve can also be replaced by other similar elastic materials, such as a silicone sleeve. The steel plate can also be replaced by other hard objects of similar materials, such as a PVC plate.

[0081] Example 4

[0082] This embodiment provides a method for forming a hollow prefabricated component, which is basically the same as the steps and working process of Embodiment 1, except that:

[0083] like Figure 3 As shown, the core mold includes an outer shaping sleeve 4 and an airbag assembly 5 placed in the outer shaping sleeve 4. When the airbag assembly 5 is inflated, the outer shaping sleeve 4 is stretched open under the force of the airbag assembly 5. When the airbag assembly 5 is deflated, the outer shaping sleeve 4 is affected by the disappearance of the force of the airbag assembly 5 and shrinks inward.

[0084] Specifically, the airbag assembly 5 includes an airbag 2 and a plurality of shaping plates 6, which surround the airbag 2. When the airbag 2 is inflated, the outer wall of the shaping plate 6 is tightly connected to the inner wall of the outer shaping sleeve 4, and the inner wall of the shaping plate 6 is in close contact with the outer wall of the airbag 2. The shaping plate 6 plays a shaping role. If the shaping plate is stretched out by the airbag and becomes rectangular, the outer shaping sleeve 4 also becomes rectangular. The outer shaping sleeve 4 plays a sealing role to prevent the slurry from entering the interior of the airbag assembly 5, and also realizes the shaping role under the action of the shaping plate.

[0085] The outer shaping sleeve 4 is a cylindrical structure made of elastic and deformable material, and the material can be rubber or silicone.

[0086] Furthermore, the outer wall of the shaping plate 6 is L-shaped or arc-shaped, or can be straight-shaped. The shapes of several shaping plates 6 have the same function as in Example 3, and different shapes of hollow structures of prefabricated components are realized based on different shapes of the shaping plates 6.

[0087] This embodiment also provides a preferred solution, in which a pad strip 7 is provided on the inner wall of the shaping plate 6, and the pad strip 7 is fixedly connected to the shaping plate. When the airbag 2 is inflated, the inner wall of the pad strip 7 is in close contact with the outer wall of the airbag. The shape of the side of the pad strip 7 in contact with the airbag is adapted to the shape of the airbag when inflated, so that the force of the airbag expansion can be better transmitted to the shaping plate, so as to achieve the effect of rapid molding and molding according to a predetermined shape.

[0088] In this embodiment, after the airbag is deflated, the shaping plate 6 is disposed in the outer shaping sleeve 4 and will not adhere to the prefabricated component, and can be easily extracted from the prefabricated component. The outer shaping sleeve 4 can be left in the prefabricated component or extracted by external force. If it is to be extracted, a release agent can be applied to the outer surface of the outer shaping sleeve 4 in advance in step A, that is, before inserting the steel cage.

[0089] Example 5

[0090] This embodiment provides a method for forming a hollow prefabricated component, which is basically the same as the steps and working process of Embodiment 4, except that:

[0091] Combination Figure 6 As shown, the core mold includes an outer shaping sleeve 4 and an airbag assembly 5 placed in the outer shaping sleeve 4. When the airbag assembly 5 is inflated, the outer shaping sleeve 4 is stretched open under the force of the airbag assembly 5. When the airbag assembly 5 is deflated, the outer shaping sleeve 4 is affected by the disappearance of the force of the airbag assembly 5 and shrinks inward.

[0092] The airbag assembly 5 includes a plurality of airbags 2 and an inner positioning tube 8. The plurality of airbags 2 surround the outside of the inner positioning tube 8. When the airbags 2 are inflated, the plurality of airbags 2 are in close contact with the inner wall of the outer shaping sleeve 4 and the outer wall of the inner positioning tube 8 at the same time, thereby expanding the outer shaping sleeve 4. When the airbags 2 are deflated, the outer shaping sleeve 4 contracts inward.

[0093] In this embodiment, the function of the outer shaping sleeve 4 and the predetermined shape when inflated are the same as those in Example 4. When the airbag 2 is inflated, the outer shaping sleeve 4 is squeezed by the airbag to reach a preset shape, such as a rectangle, a circle or an ellipse, and the inner positioning tube 8 is used to position the airbag to prevent the airbag from being squeezed inward and deformed, thereby preventing the outer shaping sleeve 4 from reaching the predetermined shape.

[0094] There are at least three airbags evenly spaced around the inner positioning tube 8. It should be noted that the sizes of the airbags do not need to be uniform, and the airbags can be set according to actual needs. For example, the three airbags can be one large and two small, or one small and two large, and arranged in a triangular shape, matching the shape of the triangular outer shaping sleeve 4, so that a triangular hollow cavity is obtained inside the final prefabricated component.

[0095] The preferred solution, combined Figure 5 As shown, there are four airbags, and four support plates 9 are evenly spaced on the outer wall of the inner positioning tube 8. The support plates are made of hard material and are fixedly connected to the inner positioning tube. An airbag 2 is provided between every two adjacent support plates 9.

[0096] In this embodiment, the airbags are positioned by the support plate 9 to achieve the effect of being independent of each other without interfering with each other, so that it is easier to obtain a rectangular hollow cavity. More preferably, the four airbags have the same shape and size.

[0097] Example 6

[0098] This embodiment provides a method for forming a hollow prefabricated component, which is basically the same as the steps and working process of Embodiment 1, except that:

[0099] like Fig. 9 As shown, the core mold includes a frame-shaped mold structure 10 with an opening at the lower end, and two mold movable plates 11 that can close the opening of the mold structure are hinged at the bottom of the mold structure 10. When the two mold movable plates 11 close the bottom of the mold structure 10, the two mold movable plates 11 can move closer to each other under the action of external force, thereby pulling the two sides of the mold structure 10 to move inward.

[0100] Specifically, nut sleeves are provided at both ends of the mold movable plate 11 , and the nut sleeves at the ends of the two mold movable plates 11 are located in corresponding positions, and the two mold movable plates 11 can be pulled closer together by bolts.

[0101] Furthermore, the two mold movable plates 11 are directly provided with elastic strips, such as made of materials such as silicone and rubber, which can achieve sealing and can also be squeezed and deformed during the bolt pulling process, so as to facilitate the deformation of the mold structure 10 and thus facilitate demoulding.

[0102] Example 7

[0103] This embodiment provides a method for forming a hollow prefabricated component, which is basically the same as the steps and working process of Embodiment 1, except that:

[0104] Combination Figure 7-Figure 8 As shown, the mold core includes at least two shaping frames 12, and a wedge block 13 is hinged between each two adjacent shaping frames 12. The wedge block 13 is connected to a telescopic mechanism 14 that can push the wedge block 13 to reciprocate along a straight line. When the wedge block 13 moves outward, the shaping frame 12 and the wedge block 13 are in close contact and thus combined into a closed frame structure. When the wedge block 13 moves inward, the wedge block 13 is separated from the shaping frame 12. When the wedge block moves outward, the shaping frame 12 and the wedge block 13 are enclosed to form a rectangular, circular or elliptical structure.

[0105] The telescopic mechanism 14 is a cylinder or an oil cylinder, and each wedge block 13 is connected to a cylinder or an oil cylinder, thereby pushing the wedge block 13 to reciprocate.

[0106] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the spirit of the present invention.

Claims

1. A method for forming a hollow prefabricated component, characterized in that: The following steps are involved: Step A, inserting a core mold into the steel cage and fixing the core mold inside the steel cage to form a core mold steel cage, Step B, move the core mold steel cage into the mold groove of the pile mold and fix it, Step C, pouring concrete into the mold, vibrating it, and curing it to form a primary prefabricated component, Step D, removing the pile mold from the surface of the primary prefabricated component, and then removing the core mold inside the primary prefabricated component to obtain a hollow prefabricated component.

2. The method for forming a hollow prefabricated component according to claim 1, characterized in that: In step A, tensioning components are connected at both ends of the steel cage to fix the core mold inside the steel cage. In step B, after the core mold steel cage is fixed in the mold groove, the steel cage is tensioned.

3. The method for forming a hollow prefabricated component according to claim 1, characterized in that: The core mold comprises a hollow tube (1). In step D, after the pile mold is removed from the surface of the primary prefabricated component, the hollow tube (1) is drawn out from the interior of the primary prefabricated component to obtain a hollow prefabricated component.

4. The method for forming a hollow prefabricated component according to claim 1, characterized in that: The core mold comprises a hollow tube (1) and an air bag (2) placed inside the hollow tube (1). In step B, after the core mold steel cage is moved into the mold groove of the pile mold and fixed, the air bag (2) is inflated to fill the inside of the hollow tube (1). In step D, after the pile mold is removed from the surface of the primary prefabricated component, the air bag (2) is deflated and pulled out of the hollow tube (1), and the hollow tube (1) is retained in the primary prefabricated component to obtain a hollow prefabricated component.

5. The method for forming a hollow prefabricated component according to claim 1, characterized in that: The core mold comprises an airbag (2) and a plurality of steel plates (3), wherein the plurality of steel plates (3) surround the airbag (2).

6. The method for forming a hollow prefabricated component according to claim 5, characterized in that: The outer cover of the airbag (2) is provided with a rubber cover (2a), and the plurality of steel plates (3) surround the rubber cover (2a). The cross section of the steel plates (3) is arc-shaped or L-shaped.

7. The method for forming a hollow prefabricated component according to claim 1, characterized in that: The core mold comprises an outer shaping sleeve (4) and an airbag assembly (5) placed in the outer shaping sleeve (4). When the airbag assembly (5) is inflated, the outer shaping sleeve (4) is stretched open under the action of the airbag assembly (5). When the airbag assembly (5) is deflated, the outer shaping sleeve (4) contracts inwardly due to the disappearance of the action of the airbag assembly (5).

8. The method for forming a hollow prefabricated component according to claim 7, characterized in that: The airbag assembly (5) comprises an airbag (2) and a plurality of shaping plates (6), wherein the plurality of shaping plates (6) surround the airbag (2).

9. The method for forming a hollow prefabricated component according to claim 8, characterized in that: When the airbag (2) is inflated, the outer wall of the shaping plate (6) is tightly connected to the inner wall of the outer shaping sleeve (4), and the inner wall of the shaping plate (6) is in tight contact with the outer wall of the airbag (2).

10. The method for forming a hollow prefabricated component according to claim 9, characterized in that: The outer wall of the shaping plate (6) is L-shaped or arc-shaped, and a cushion strip (7) is also provided on the inner wall of the shaping plate (6). When the airbag (2) is inflated, the inner wall of the cushion strip (7) is in close contact with the outer wall of the airbag.

11. The method for forming a hollow prefabricated component according to claim 7, characterized in that: The airbag assembly (5) comprises a plurality of airbags (2) and an inner positioning tube (8). The plurality of airbags (2) surround the outside of the inner positioning tube (8). When the airbags (2) are inflated, the plurality of airbags (2) are in close contact with the inner wall of the outer shaping sleeve (4) and the outer wall of the inner positioning tube (8) at the same time, thereby expanding the outer shaping sleeve (4). When the airbags (2) are deflated, the outer shaping sleeve (4) contracts inwardly.

12. The method for forming a hollow prefabricated component according to claim 11, characterized in that: There are at least three air bags which are evenly spaced and arranged around the inner positioning tube (8).

13. The method for forming a hollow prefabricated component according to claim 12, characterized in that: There are four airbags, and four support plates (9) are evenly spaced apart on the outer wall of the inner positioning tube (8), and an airbag (2) is arranged between every two adjacent support plates (9).

14. The method for forming a hollow prefabricated component according to claim 1, characterized in that: The core mold comprises a frame-shaped mold structure (10) having an opening at the lower end, and two mold movable plates (11) capable of closing the mold structure opening are hinged at the bottom of the mold structure (10). When the two mold movable plates (11) close the bottom of the mold structure (10), the two mold movable plates (11) can move closer to each other under the action of an external force, thereby pulling the two sides of the mold structure (10) to move inward.

15. The method for forming a hollow prefabricated component according to claim 1, characterized in that: The mold core comprises at least two shaping frames (12), a wedge block (13) is hinged between every two adjacent shaping frames (12), and the wedge block (13) is connected to a telescopic mechanism (14) capable of pushing the wedge block (13) to reciprocate along a straight line. When the wedge block (13) moves outward, the shaping frame (12) and the wedge block (13) are in close contact with each other to form a closed frame structure, and when the wedge block (13) moves inward, the wedge block (13) is separated from the shaping frame (12).

16. A hollow prefabricated component made according to the method for forming a hollow prefabricated component according to any one of claims 1 to 15.

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