Centrifugal concrete pile mold and flatbed vehicle for placing the mold

Abstract

A centrifugal concrete pile mold, comprising a mold body (1) formed by a lower mold (11) and an upper mold (12), and a mold bolt assembly (2) for connecting the lower mold (11) and the upper mold (12), wherein a front support plate (3a) and a rear support plate (3b) are respectively fixed to the front end face (1a) and the rear end face (1b) of the mold body (1); the front support plate (3a) and the rear support plate (3b) have an annular wedge-shaped surface (33) at the periphery of the end faces that fit the mold body (1). It is a centrifugal concrete pile mold that can realize precise positioning of the mold, and provides the possibility of placing the mold lifting line and the centrifuge on the same axis, which is beneficial to optimizing the centrifugal concrete pile production line. The present invention also relates to a flatbed truck used in conjunction with the above-mentioned mold.

Description

Technical Field

[0001] The invention relates to a centrifugal concrete pile mould and a flatbed vehicle for placing the mould. Background Art

[0002] Pre-tensioned prestressed centrifugal concrete piles are an important pile foundation material in my country and belong to the technical field of concrete products. Their factory production can be traced back to the 1960s. In the 1980s, with the good situation of reform and opening up, they gradually developed. As a heavy prefabricated component, its main processes are cutting steel bars to a fixed length, forming steel bars into cages, installing end plates, placing steel cages with end plates into bottom molds, cleaning upper molds and bottom molds, applying isolation agents, concrete mixing, laying, mold closing, tensioning, centrifugal forming, steam curing, demolding and other processes. In order to realize the factory production of centrifugal prefabricated piles, we need to arrange each process according to production efficiency and safety to form a reasonable assembly line. Since the day when centrifugal piles were invented, the design of the assembly line has always been a key consideration for professionals in the industry. It is also an important part of the production process of centrifugal concrete piles. Whether the assembly line is reasonable is related to product quality, production safety, production efficiency, and labor intensity of the labor force. Now it is also related to energy saving, environmental protection, and whether it has the basis of automation and intelligent production.

[0003] There are two main types of flow in centrifugal concrete piles in my country: one is longitudinal flow, see P30 of Prestressed Concrete Piles by Ruan Qinan; a 55m PHC pipe pile production plant disclosed in patent application number 200710036609.4. The other is transverse flow, which is divided into single-span reciprocating transverse flow, such as Concrete Piles and Cement Products by Zou Wengang, 2012, No. 8, page 32; and a precast concrete pile production method disclosed in patent application number 201010604071.4; and a new type of efficient, energy-saving and environmentally friendly centrifugal concrete pile manufacturing system disclosed in patent application number 200910186075.2. And multi-span circulating transverse flow, such as Concrete Piles and Cement Products by Yan Zhilong, 2006, No. 5, page 21. The aforementioned documents not only disclose the single-span and multi-span circulating transverse flow commonly used in my country today, but also disclose the assembly line layout based on the current level of South Korea and Japan. In my country, longitudinal flow is mainly used in the production of centrifugal piles with a length greater than 30 meters and a diameter greater than φ600mm. Because it is within a one-span workshop, the flow between each process is unclear and cranes are prone to bumping into each other when going back and forth, so it is limited to the production of long piles. (Because if long piles are produced with transverse flow, the width of the workshop is very wide, which is not realistic in production). As for the production of centrifugal piles below 30 meters, transverse flow is usually used. There are single-span workshop production methods and multi-span workshop circulation production lines. In the layout of these transverse flow lines, the same crane has to carry more than several different types of workpieces, and multiple cranes are set up in a one-span workshop. There are avoidance conflicts when the cranes carry different workpieces.

[0004] The molds that have been fed and prestressed need to be lifted horizontally to the centrifuge by a crane. The process of the mold on the assembly line is to move the mold from one operation point to another by a crane. When it is running between two spans of the factory, it is mainly transported by a trolley, that is, the mold is lifted onto the trolley by a crane. When it arrives at the other span of the factory, it is lifted from the trolley to the work site. There are many control processes, and the centrifuge and the trolley transportation line are not on the same axis, so they must be misplaced, resulting in an increase in space. With the additional increase in space, it will also cause unreasonable and difficult layouts of other related processes. For example, the length of the workshop must be lengthened, and the corresponding other workshop processes related to the workshop must also be adjusted, making the entire process layout not compact, and also increasing the workload of the crane in the span of the factory and causing conflicts between the work of multiple cranes. This causes an imbalance in the production capacity of the processes in the multi-span factory, and some operations have waiting phenomena, which is not convenient for the automation and intelligence of the centrifuge process. All of these seriously restrict the production of centrifugal concrete piles to develop in the direction of automation and intelligence. In order to place the mold lifting line on the same axis as the centrifuge, the mold must be placed accurately, that is, the length direction of the mold should be on the extension line of the length direction of the centrifuge after placement.

[0005] To this end, how to facilitate the precise positioning of the mold, how to quickly and conveniently pour out the muddy water remaining in the centrifugal concrete pile after centrifugation, and how to achieve efficient steaming and rapid mold closing are all important factors in realizing the development of centrifugal concrete pile production towards automation and intelligence. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a centrifugal concrete pile mold that can realize precise positioning of the mold closing in response to the above-mentioned existing technical status, so as to make it possible to place the mold lifting line and the centrifuge on the same axis, which is conducive to optimizing the centrifugal concrete pile production line.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a centrifugal concrete pile mold, including a mold body formed by a lower half mold and an upper half mold, and a mold bolt assembly for connecting the lower half mold and the upper half mold; a front support plate and a rear support plate are respectively fixed on the front end face and the rear end face of the mold body; it is characterized in that: the periphery of the end faces of the front support plate and the rear support plate that are in contact with the mold body has an annular wedge-shaped surface.

[0008] As a further improvement, the rear support plate is directly fixed to the end plate on one side of the steel cage in the mold body by connecting screws, and the rear support plate is attached to the rear end surface of the mold body; the front support plate is connected to the end plate on the other side of the steel cage in the mold body by a tensioning assembly. This mold structure hides the main components of the tensioning device in the mold body, effectively shortening the length of the mold tensioning production line.

[0009] Further improvement, the above-mentioned tensioning assembly includes a first tensioning plate, a clamp, and a second tensioning plate. The first tensioning plate is fixed to the end plate on one side of the steel cage, and the second tensioning plate is located in the mold body. Annular grooves are provided on the circumferential surfaces of the first tensioning plate and the second tensioning plate. The clamp is inserted into the annular grooves on the first tensioning plate and the second tensioning plate to connect the two. The outer end surface of the second tensioning plate has a tensioning wire rod extending outward. After the tensioning wire rod passes through the front support plate, it is locked on the front support plate by a locking nut threaded on the tensioning wire rod. A steam channel is provided on the tensioning wire rod that runs through it axially, and a steam inlet hole is provided on the first tensioning plate. Steam can enter the inner cavity of the centrifugal concrete pile located in the mold body after centrifugal forming through the steam channel and the steam inlet hole in sequence.

[0010] The aforementioned steam channel is suitable for steam curing centrifugal concrete piles. During steam curing, the opening on the rear support plate is plugged with a plug, and then the pipe joint of the gas source is connected to the tensioning wire rod. The steam passes through the steam channel on the tensioning wire rod and the steam inlet hole on the first tensioning plate in turn and enters the inner cavity of the centrifugal concrete pile, thereby completing the steam curing. The steam used in this steam curing method directly steams the centrifugal concrete pile, which has high steam curing efficiency and can effectively reduce the waste of steam. The mold does not need to be opened during the steam curing process. Compared with the traditional steam curing method of directly lifting the pile out to the steam curing pool, the centrifugal concrete pile is prevented from being damaged during the lifting process before steam curing. Moreover, the design of setting the steam channel on the tensioning wire rod is very clever. First, the tensioning wire rod is an independent small component, which is conducive to processing the steam curing channel on it. The tensioning wire rod itself has threads, which is convenient for connecting the steam pipe joint. Of course, it is also possible to directly drill holes on the side wall of the mold body, but the processing is convenient, and the empty space on the mold body will cause the concrete to flow out during the centrifugal process.

[0011] The traditional way of dumping muddy water is to use a crane to lift the pile, and then tilt the pile to complete the dumping. The crane is inconvenient to control and the operation is time-consuming. In order to facilitate the dumping of the muddy water remaining in the concrete pile after centrifugation, a further improvement is made. The above-mentioned rear support plate is provided with a drainage hole for connecting the inner cavity of the centrifugal concrete pile located in the mold body after centrifugal molding and the outside world. The outer arc wall of the lower mold is provided with two groups of support components arranged at intervals along the length direction of the mold. Each group of the support components includes two support rods arranged symmetrically on the left and right, and each support rod protrudes laterally from the lower mold. The dumping is very convenient with this structure. It only needs to set a push-up mechanism such as a hydraulic cylinder that cooperates with the support rod on both sides of the centrifuge. When dumping, the push-up mechanism pushes the support rod in the mold away from the rear support plate to tilt the entire mold. The residual muddy water is dumped out through the drainage hole on the rear support plate. The entire operation process does not require a crane, which is convenient and time-saving, and has low operating costs.

[0012] As a further improvement, the mold is provided with a positioning lug which is radially protruding and exposed on the circumference of the mold body, and a positioning groove is formed on the positioning lug to form a positioning match with the mold positioning block on the mold placement surface. Through the positioning of the positioning groove and the mold positioning block on the mold placement surface, the lower mold is ensured to be positioned accurately on the mold placement surface, which is conducive to the accurate position of the upper mold and the lower mold, and at the same time plays a guiding role, facilitating the closing operation of the upper mold.

[0013] As an improvement, the positioning groove is in a flared shape with a diameter gradually expanding from the inside to the outside. The flared shape with a diameter gradually expanding from the inside to the outside facilitates the mold positioning block to gradually enter the positioning groove, and can also eliminate the gap between the positioning groove and the mold positioning block, ensuring that the mold is firmly positioned on the mold placement surface. Preferably, the positioning groove has a trapezoidal shape.

[0014] Preferably, the positioning lugs may be multiple and spaced apart on the outer peripheral wall of the lower mold. In this way, the lower mold can be positioned when it is placed on a flatbed truck, and then the front support plate and the rear support plate are installed. The lower mold can be positioned without fixing the front support plate and the rear support plate on the lower mold plate, and the assembly is more user-friendly.

[0015] Of course, the positioning lugs are arranged on the circumferential surfaces of the front support plate and the rear support plate, and the front support plate and the rear support plate are provided with limiting structures respectively between the front and rear surfaces of the upper mold. When closing the upper mold, the guiding effect of the limiting structures facilitates the accurate closing position of the upper mold and the lower mold, and also plays a guiding role, further facilitating the closing operation of the upper mold.

[0016] Preferably, the above-mentioned limiting structure includes limiting grooves arranged on the peripheral surfaces of the front support plate and the rear support plate, and the front end surface and the rear end surface of the upper half mold are provided with axially protruding limiting pins for forming a snap fit with the limiting grooves. Through the cooperation of the limiting pins and the limiting grooves, the positions of the front support plate and the rear support plate relative to the mold body are accurately positioned. If the limiting pins and the limiting grooves cannot match, it means that the positions of the front support plate and the rear support plate relative to the mold body are incorrect.

[0017] Further improvement, the front support plate and the rear support plate have two positioning lugs respectively, the two positioning lugs on the front support plate and the two positioning lugs on the rear support plate are symmetrically arranged along the center of their respective corresponding support plates, and the two limit grooves are respectively located at the bottom of the positioning groove and connected to the positioning groove. The limit groove and the positioning groove are located on the same axis, and the number of grooves on the support plate is reduced as much as possible. In addition, the limit groove is located at the bottom of the positioning groove and is connected, so that the positioning pin is hidden under the positioning groove, which will not affect the coordination between the positioning groove and the mold positioning block. The use of the support plate on the symmetrically arranged positioning lugs does not have directionality, and is more convenient to use.

[0018] Preferably, the opening of one of the two positioning grooves located on the front support plate and the rear support plate faces and is vertically aligned with the mold placement surface.

[0019] The second technical problem to be solved by the present invention is to provide a flatbed vehicle for use in conjunction with the above-mentioned centrifugal concrete pile mould.

[0020] A flatbed truck for placing the centrifugal concrete pile mold, comprising a flatbed constrained on a guide rail and capable of rolling and sliding along the guide rail, characterized in that the top surface of the flatbed constitutes the mold placing surface, and at least two mold positioning blocks located on the axis and spaced apart from each other are fixed on the flatbed, and the mold positioning blocks match the positioning grooves.

[0021] As a further improvement, the top surface of the above-mentioned flat plate is also provided with two mold limiting rails arranged at intervals on the left and right and arranged along the length direction of the flat plate, and the mold positioning block is located between the two mold limiting rails. The mold limiting rails play an auxiliary positioning role for the mold body on the left and right sides of the mold body, and assist the mold body to roll on the flat plate.

[0022] Compared with the prior art, the advantages of the present invention are: the front support plate and the rear support plate are used to tension the steel cage in the mold. Since the support plate is pre-fitted with the end face of the lower mold, after the connection is completed, the upper mold is closed. Due to the existence of the annular wedge surface, a guiding slope is formed, which is conducive to guiding the upper mold to be placed between the two support plates, which not only facilitates mold closing, but also ensures the position accuracy of the upper mold for mold closing; finally, the mold body is accurately positioned, which provides the possibility of placing the mold lifting line and the centrifuge on the same axis, which is conducive to optimizing the centrifugal concrete pile production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the first embodiment of the centrifugal concrete pile mold of the present invention;

[0024] Figure 2 A cross-sectional view of a first embodiment of a centrifugal concrete pile mold of the present invention;

[0025] Figure 3 It is a three-dimensional exploded view of the first embodiment of the centrifugal concrete pile mold of the present invention;

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the first embodiment of the centrifugal concrete pile mold of the present invention when the upper half mold is not in the mold closing state;

[0027] Figure 5 It is a three-dimensional structural schematic diagram of a second embodiment of the centrifugal concrete pile mold of the present invention;

[0028] Figure 6 A cross-sectional view of a second embodiment of a centrifugal concrete pile mold of the present invention;

[0029] Figure 7 It is a three-dimensional exploded view of the first embodiment of the centrifugal concrete pile mold of the present invention;

[0030] Figure 8 This is a schematic diagram of the three-dimensional structure of the first embodiment of the centrifugal concrete pile mold of the present invention when the upper half mold is not in the mold closing state;

[0031] Fig. 9 A top view of an embodiment of a flatbed vehicle of the present invention;

[0032] Fig.10 It is a schematic diagram of the three-dimensional structure of the mold positioning block in the embodiment of the flatbed vehicle of the present invention;

[0033] Fig.11 It is a schematic diagram of the working principle of the flatbed vehicle and the first embodiment of the mold used in conjunction with each other in the present invention;

[0034] Fig.12 This is a schematic diagram of the working principle of the second embodiment of the flatbed truck and the mold used in conjunction with each other according to the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings.

[0036] like Figures 1 to 4 FIG. 1 is a first embodiment of the centrifugal concrete pile mold of the present invention.

[0037] A centrifugal concrete pile mold includes a mold body 1 formed by a lower mold half 11 and an upper mold half 12, and a mold bolt assembly 2 for connecting the lower mold half 11 and the upper mold half 12. A front support plate 3a and a rear support plate 3b are respectively fixed to the front end face 1a and the rear end face 1b of the mold body 1; the periphery of the end faces of the front support plate 3a and the rear support plate 3b that are in contact with the mold body 1 has an annular wedge surface 33.

[0038] The mold is provided with a positioning lug 31 which is radially protruding and exposed on the circumference of the mold body 1. The positioning lug 31 is provided with a positioning groove 311 for forming a positioning match with the mold positioning block 5 on the mold placement surface 93. The positioning groove 311 is in an expanded shape with a diameter gradually expanding from the inside to the outside, and the shape of the positioning groove 311 is a trapezoid.

[0039] In this embodiment, there are multiple positioning lugs 31 which are arranged at intervals on the outer peripheral wall of the lower mold 11.

[0040] The limiting structure includes limiting grooves 32 arranged on the circumference of the front support plate 3a and the rear support plate 3b, and the front and rear surfaces of the upper mold 12 are provided with axially protruding limiting pins 13 for forming a snap fit with the limiting grooves 32. There are two positioning lugs 31 on the front support plate 3a and the rear support plate 3b respectively, and the two positioning lugs 31 on the front support plate 3a and the two positioning lugs 31 on the rear support plate 3b are both symmetrically arranged along the center of their respective corresponding support plates, and the limiting grooves 32 have two bottoms located at the bottom of the positioning grooves 311 and connected to the positioning grooves 311. Among the two positioning grooves 311 on the front support plate 3a and the rear support plate 3b, the opening of one of the positioning grooves 311 faces and is vertically aligned with the mold placement surface 93.

[0041] The rear support plate 3b is directly fixed to the end plate 4 on one side of the steel cage in the mold body 1 by connecting screws, and the rear support plate 3b is attached to the rear end surface of the mold body 1; the front support plate 3a is connected to the end plate 4 on the other side of the steel cage in the mold body 1 by a tensioning assembly.

[0042] The tensioning assembly includes a first tensioning plate 6a, a clamp 7, and a second tensioning plate 6b. The first tensioning plate 6a is fixed on the end plate 4 on one side of the steel cage, and the second tensioning plate 6b is located in the mold body 1. An annular groove 61 is provided on the circumferential surface of the first tensioning plate 6a and the second tensioning plate 6b. The clamp 7 is inserted into the annular groove 61 on the first tensioning plate 6a and the second tensioning plate 6b to connect the two. The clamp 7 is formed by the upper and lower halves. The center of the outer end surface of the second tensioning plate 6b has a tensioning wire rod 8 extending outward. After the tensioning wire rod 8 passes through the front support plate 3a, it is locked on the front support plate 3a by a locking nut 14 threadedly connected to the tensioning wire rod 8. The tensioning wire rod 8 is provided with a steam channel 81 that runs through it in the axial direction. The first tensioning plate 6a is provided with a steam inlet hole 62. Steam can enter the inner cavity 101 of the centrifugal concrete pile 10 located in the mold body 1 after centrifugal forming through the steam channel 81 and the steam inlet hole 62 in sequence.

[0043] The rear support plate 3b is provided with a drainage hole 34 for connecting the inner cavity 101 of the centrifugal concrete pile 10 located in the mold body 1 after centrifugal forming with the outside world. The outer arc-shaped wall of the lower mold 12 is provided with two groups of support components arranged at intervals along the length direction of the mold. Each group of the support components includes two support rods 15 symmetrically arranged on the left and right, and each support rod 15 protrudes laterally from the lower mold 11.

[0044] like Figures 5 to 8 FIG. 2 shows a second embodiment of the centrifugal concrete pile mold of the present invention.

[0045] The difference between this embodiment and the first embodiment is that the positioning lugs 31 are arranged on the circumferential surfaces of the front support plate 3a and the rear support plate 3b, and limiting structures are provided between the front support plate 3a and the rear support plate 3b and the front end face 1a and the rear end face 1b of the upper half mold 12 respectively.

[0046] like Figures 9-10 Shown is an embodiment of a flatbed vehicle of the present invention.

[0047] A flatbed vehicle is provided for placing the centrifugal concrete pile mold as described in the first embodiment, including a flatbed 9 constrained on a guide rail 91 and capable of rolling and sliding along the guide rail 91, the top surface of the flatbed 9 constituting the mold placing surface 93, a plurality of mold positioning blocks 5 located on the axis and spaced apart from each other are fixed on the flatbed 9, and the mold positioning blocks 5 match the positioning grooves 311. Two mold limiting steel rails 92 spaced apart from each other and arranged along the length direction of the flatbed 9 are also provided on the top surface of the flatbed 9, and the mold positioning block 5 is located between the two mold limiting steel rails 92.

[0048] like Fig.11 , which is a diagram of the use status of the flatbed cart in cooperation with the first embodiment of the mold.

[0049] like Fig.12 , which is a diagram of the use of the flatbed car in conjunction with the second embodiment of the mold

[0050] The working principle and process of the centrifugal concrete pile mold embodiment are as follows

[0051] The steel cage is placed in the lower mold 11, and the lower mold 11 is placed on the top surface of the flat plate 9. The rear support plate 3b is fixed to the end plate 4 on the rear side of the steel cage in the lower mold 11 by bolts, and the rear support plate 3b is in contact with the rear end surface of the lower mold 11; the first tensioning plate 6a is fixed to the end plate 4 on the front side of the steel cage by bolts, and the second tensioning plate 6b is located in the mold body 1. The clamp 7 is inserted into the annular groove 61 on the first tensioning plate 6a and the second tensioning plate 6b to connect the two. The tensioning wire rod 8 at the rear end of the second tensioning plate 6b passes through the front support plate 3a. At the same time, it is necessary to ensure that the mold positioning block 5 on the mold placement surface 93 is inserted into the positioning groove 311 with the opening facing downward, and then tighten the locking nut 14 to ensure that the front support plate 3a is in close contact with the front end surface of the lower mold 11, and the rear support plate 3b is in close contact with the rear end surface of the lower mold 11; then perform the tensioning operation and the grouting operation; after the operation is completed, close the upper mold 12, and under the guiding cooperation of the wedge surface 33, finally achieve precise positioning of the mold body 1, so as to provide the possibility of placing the mold lifting line and the centrifuge on the same axis, which is conducive to optimizing the centrifugal concrete pile production line.

[0052] Specifically, the mold body 1 after mold closing is lifted onto the centrifuge through the lifting pile equipment to complete the centrifugation. After centrifugation, the support rod 15 in the mold away from the rear support plate 3b is pushed by the push-up mechanism always on the centrifuge to tilt the entire mold, and the residual mud water is poured out through the drainage hole 34 on the rear support plate 3b. The entire operation process does not require a crane, the operation is convenient and time-saving, and the operation cost is low.

[0053] Then the completed mold body 1 containing the centrifugal concrete pile 10 is hoisted into the steam curing tank.

[0054] The setting of the above-mentioned steam channel 81 is suitable for steam-curing centrifugal concrete piles. During steam-curing, the drainage hole 34 on the rear support plate 3b is blocked with a plug, and then the pipe joint of the air source is connected to the tensioning wire rod 8. The steam passes through the steam channel 81 on the tensioning wire rod 8 and the steam inlet hole 62 on the first tensioning plate 6a in turn and enters the inner cavity 101 of the centrifugal concrete pile 10, thereby completing the steam-curing. The steam used in this steam-curing method directly steam-cures the centrifugal concrete pile, has high steam-curing efficiency, and can effectively reduce the waste of steam. The mold does not need to be opened during the steam-curing process. Compared with the traditional steam-curing method of directly hoisting the pile into the steam-curing tank, the centrifugal concrete pile is prevented from being damaged during the hoisting process before steam-curing.

[0055] It should be noted that in the description of the present embodiment, the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. The terms "install", "connect", 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 direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A centrifugal concrete pile mold, comprising a mold body (1) formed by a lower mold (11) and an upper mold (12), and a mold bolt assembly (2) for connecting the lower mold (11) and the upper mold (12), wherein a front support plate (3a) and a rear support plate (3b) are respectively fixed on the front end surface (1a) and the rear end surface (1b) of the mold body (1); characterized in that: The peripheries of the end surfaces of the front support plate (3a) and the rear support plate (3b) that are in contact with the mold body (1) have an annular wedge-shaped surface (33); The rear support plate (3b) is directly fixed to the end plate (4) on one side of the steel cage in the mold body (1) by means of connecting screws, and the rear support plate (3b) is attached to the rear end surface of the mold body (1); the front support plate (3a) is connected to the end plate (4) on the other side of the steel cage in the mold body (1) by means of a tensioning assembly; The tensioning assembly comprises a first tensioning plate (6a), a clamp (7), and a second tensioning plate (6b). The first tensioning plate (6a) is fixed on the end plate (4) on one side of the steel cage, and the second tensioning plate (6b) is located in the mold body (1). Annular grooves (61) are provided on the peripheral surfaces of the first tensioning plate (6a) and the second tensioning plate (6b). The clamp (7) connects the first tensioning plate (6a) and the second tensioning plate (6b) by being inserted into the annular grooves (61) on the first tensioning plate (6a) and the second tensioning plate (6b). The outer end surface of the second tensioning plate (6b) has a tensioning wire rod (8) extending outward. After the tensioning wire rod (8) passes through the front support plate (3a), it is locked on the front support plate (3a) through a locking nut (14) threadedly connected to the tensioning wire rod (8).

2. The centrifugal concrete pile mold according to claim 1, characterized in that: The tensioning wire rod (8) is provided with a steam channel (81) extending axially therethrough, and the first tensioning plate (6a) is provided with a steam inlet hole (62), so that steam can sequentially pass through the steam channel (81) and the steam inlet hole (62) and then enter the inner cavity (101) of the centrifugal concrete pile (10) located in the mold body (1) after centrifugal molding.

3. The centrifugal concrete pile mold according to claim 1, characterized in that: The rear support plate (3b) is provided with a drainage hole (34) for connecting an inner cavity (101) of the centrifugal concrete pile (10) located in the mold body (1) after centrifugal forming with the outside world, and the outer arc-shaped wall of the lower mold (12) is provided with two groups of support components arranged at intervals along the length direction of the mold, each group of the support components includes two support rods (15) arranged symmetrically on the left and right, and each support rod (15) protrudes laterally from the lower mold (11).

4. The centrifugal concrete pile mold according to claim 1, characterized in that: The mold is provided with a radially protruding positioning lug (31) that is exposed on the circumference of the mold body (1), and the positioning lug (31) is provided with a positioning groove (311) for forming a positioning match with a mold positioning block (5) on the mold placement surface (93).

5. The centrifugal concrete pile mold according to claim 4, characterized in that: The positioning groove (311) is in an expanded shape with a diameter gradually increasing from the inside to the outside.

6. The centrifugal concrete pile mold according to claim 4, characterized in that: The positioning lugs (31) are arranged on the circumferential surfaces of the front support plate (3a) and the rear support plate (3b), and limiting structures are respectively provided between the front support plate (3a) and the rear support plate (3b) and the front end surface (1a) and the rear end surface (1b) of the upper half mold (12).

7. The centrifugal concrete pile mold according to claim 6, characterized in that: The limiting structure comprises limiting grooves (32) arranged on the circumferential surfaces of the front support plate (3a) and the rear support plate (3b), and the front end surface and the rear end surface of the upper half mold (12) are provided with axially protruding limiting pins (13) for forming a snap fit with the limiting grooves (32).

8. The centrifugal concrete pile mold according to claim 7, characterized in that: The front support plate (3a) and the rear support plate (3b) each have two positioning lugs (31), and the two positioning lugs (31) on the front support plate (3a) and the two positioning lugs (31) on the rear support plate (3b) are both symmetrically arranged along the center of their respective corresponding support plates, and the limiting grooves (32) have two positions respectively located at the bottom of the positioning groove (311) and connected to the positioning groove (311).

9. The centrifugal concrete pile mold according to claim 4, characterized in that: There are a plurality of positioning lugs (31) which are arranged on the outer peripheral wall of the lower mold (11).

10. A flatbed vehicle for placing the centrifugal concrete pile mold according to any one of claims 1 to 9, comprising a flatbed (9) constrained on a guide rail (91) and capable of rolling and sliding along the guide rail (91), characterized in that: The top surface of the flat plate (9) constitutes the mold placement surface (93), and at least two mold positioning blocks (5) located on the axis and spaced apart from each other are fixed on the flat plate (9), and the mold positioning blocks (5) match the positioning grooves (311).

11. The flatbed vehicle according to claim 10, characterized in that: The top surface of the flat plate (9) is also provided with two mold limiting steel rails (92) which are arranged at intervals on the left and right and are arranged along the length direction of the flat plate (9), and the mold positioning block (5) is located between the two mold limiting steel rails (92).

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