PCCP (prestressed concrete cylinder pipe) vibration-free concrete vacuum pouring forming device and method

Abstract

The invention relates to the technical field of water conservancy projects, in particular to a PCCP vibration-free concrete vacuum pouring forming device and method.The pouring mold comprises a pouring outer mold, a steel cylinder and a pouring inner mold which are sequentially arranged from outside to inside in a sleeving mode, and a pouring top mold is arranged at the top of the pouring outer mold and the top of the pouring inner mold; an outer core cavity and an inner core cavity are respectively formed by gaps between the steel cylinder and the pouring outer mold and between the steel cylinder and the pouring inner mold; the vacuum mechanism comprises an outer core vacuum assembly and an inner core vacuum assembly, the outer core vacuum assembly is connected with the pouring outer mold, and the inner core vacuum assembly is connected with the pouring inner mold; the pumping mechanism comprises a pumping assembly, an outer core material distributing pipe and an inner core material distributing pipe, wherein the outer core material distributing pipe and the inner core material distributing pipe are connected with the pumping assembly, and the outer core material distributing pipe and the inner core material distributing pipe communicate with the outer core cavity and the inner core cavity correspondingly. By means of the method, the quality defects such as air holes, honeycombs, pitted surfaces and water waves on the surface of the formed PCCP concrete pipe core can be effectively overcome, and meanwhile the phenomenon that aggregate in the top area of the pipe core sinks due to vibration can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, and in particular to a PCCP vibration-free concrete vacuum casting molding device and method. Background Art

[0002] Prestressed concrete cylinder pipe (PCCP) is a composite pipe that combines high-strength steel wire, concrete and steel plate. It has the characteristics of high working pressure, corrosion resistance and earthquake resistance. PCCP is welded into a cylinder by thin steel plate and socket joint steel ring, and then concrete is poured inside and outside the cylinder to make a pipe core. After curing, the annular prestressed steel wire is wound on the surface of the pipe core, and finally a mortar protective layer is sprayed. PCCP has the advantages of both steel pipe and prestressed concrete pipe, can withstand high soil cover and high working pressure, and has the characteristics of good joint sealing, corrosion resistance, long service life, good earthquake resistance, easy installation, low operating cost and good anti-seepage performance.

[0003] At present, PCCP is the main pipe type in long-distance, cross-basin water diversion and regulation projects. The concrete pipe core of PCCP is made by vertical casting and vibration molding. After the pipe core is formed, it is easy to have quality defects such as pores, honeycombs, rough surfaces, and water marks, which not only affect the quality of concrete production, but also greatly affect the appearance quality of the pipeline. In addition, the pouring height of the pipe core concrete is usually not less than 5m. Due to the use of vibration molding, the top of the pipe core will have problems such as aggregate sinking and a large slurry layer thickness, which can easily cause cracks in the concrete at the end of the concrete pipe core. Summary of the invention

[0004] The present invention aims to solve the problems that defects are easy to appear on the wall surface of the PCCP concrete pipe core formed by the prior art and that aggregates in the top area are easy to sink. A PCCP vibration-free concrete vacuum casting molding device and method are provided. Vibration-free concrete is adopted, which can effectively avoid the appearance of quality defects such as pores, honeycombs, rough surfaces, water marks, etc. on the surface of the PCCP concrete pipe core after forming. At the same time, the phenomenon of aggregates in the top area of ​​the pipe core sinking due to vibration can be avoided, thereby improving the casting quality of the PCCP concrete pipe core and improving the construction efficiency.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is: a PCCP vibration-free concrete vacuum casting and forming device, comprising a casting mold, a vacuum mechanism and a pumping mechanism, the casting mold comprising a casting outer mold, a steel cylinder and a casting inner mold which are sequentially arranged from the outside to the inside, a casting top mold is arranged on the top of the casting outer mold and the casting inner mold, and the gap between the steel cylinder and the casting outer mold and the casting inner mold respectively constitutes an outer core cavity and an inner core cavity, and the casting mold is formed by the cooperation of the casting outer mold, the casting inner mold and the casting top mold to cast and form the PCCP concrete pipe core; the vibration-free concrete can be pumped into the outer core cavity and the inner core cavity by the pumping mechanism, and the vacuum mechanism can extract the air in the outer core cavity and the inner core cavity to form a negative pressure vacuum cavity, thereby avoiding the appearance of quality defects such as pores, honeycombs, rough surfaces, water marks, etc. on the surface of the PCCP concrete pipe core after its formation.

[0006] The vacuum mechanism includes an outer core vacuum component and an inner core vacuum component. The outer core vacuum component is connected to the casting outer mold, and the inner core vacuum component is connected to the casting inner mold. The outer core vacuum component can extract air from the outer core cavity to form a negative pressure vacuum cavity in the outer core cavity, and the inner core vacuum component can extract air from the inner core cavity to form a negative pressure vacuum cavity in the inner core cavity, so that the vibration-free concrete is pumped into the outer core cavity and the inner core cavity under the action of negative pressure.

[0007] The pumping mechanism includes a pumping component and an outer core distribution pipe and an inner core distribution pipe connected to the pumping component. The outer core distribution pipe and the inner core distribution pipe are respectively connected to the outer core cavity and the inner core cavity. Through the action of the outer core distribution pipe and the inner core distribution pipe, the pumping component pumps the vibration-free concrete into the outer core cavity and the inner core cavity respectively.

[0008] Furthermore, the bottom of the casting top mold is provided with clamping rings corresponding to the casting outer mold, steel cylinder and casting inner mold respectively, the bottom of the clamping ring is provided with a clamping groove, the inside of the clamping ring is inlaid with a sealing ring, and the casting top mold is clamped on the casting outer mold, steel cylinder and casting inner mold through the clamping groove. The purpose of installing the casting top mold to the top of the casting outer mold, steel cylinder and casting inner mold is achieved through the clamping groove at the bottom of the clamping ring, wherein the sealing ring plays a sealing role to improve the overall airtightness of the casting mold.

[0009] Furthermore, the outer core vacuum assembly and the inner core vacuum assembly both include a vacuum pump, a vacuum pipe and a transparent tube. The two ends of the vacuum pipe are respectively connected to the transparent tube and the suction end of the vacuum pump, and the transparent tube is connected to the discharge transparent tube. The vacuum pipe is provided with a valve 1, the connection between the vacuum pipe and the transparent tube is provided with a valve 2, and the discharge transparent tube is provided with a valve 3. The vacuum pump extracts the air in the inner core cavity and the outer core cavity through the transparent tube and the vacuum pipe. The transparent tube also controls and determines the height of the non-vibration concrete pouring. The discharge transparent tube can prevent the non-vibration concrete from flowing back into the vacuum pump during vacuuming, and is also convenient for cleaning the non-vibration concrete that enters the transparent tube.

[0010] Furthermore, one end of the transparent tube of the outer core vacuum assembly is connected to the outer core cavity, and one end of the transparent tube of the inner core vacuum assembly is connected to the inner core cavity. The air in the outer core cavity is extracted through the vacuum pump and the transparent tube of the outer core vacuum assembly, and the air in the inner core cavity is extracted through the vacuum pump and the transparent tube of the inner core vacuum assembly.

[0011] Furthermore, the pumping assembly includes a pumping device, a pumping pipe and a material distribution plate. One end of the pumping pipe is connected to the discharge end of the pumping device and the other end is connected to the material distribution plate. A pumping pipe valve is provided on the pumping pipe. An outer core discharge port and an inner core discharge port are provided in a ring shape on the material distribution plate. The material distribution plate serves to distribute vibration-free concrete. The vibration-free concrete pumped into the pumping pipe can be transported to the outer core cavity and the inner core cavity respectively by using the outer core discharge port and the inner core discharge port on the material distribution plate.

[0012] Furthermore, the casting top mold is provided with an outer core feed port and an inner core feed port in a ring shape; the two ends of the outer core distribution pipe are respectively connected to the pump pipe and the outer core cavity through the outer core discharge port and the outer core feed port, and the two ends of the inner core distribution pipe are respectively connected to the pump pipe and the inner core cavity through the inner core discharge port and the inner core feed port; the connection between the outer core distribution pipe and the inner core distribution pipe and the distribution plate is provided with a discharge valve, and the diameter of the outer core distribution pipe is greater than the diameter of the inner core distribution pipe. The discharge valve plays the role of opening and closing the outer core distribution pipe or the inner core distribution pipe, and the pouring height difference of the vibration-free concrete in the outer core cavity and the inner core cavity can be controlled by adjusting the diameter of the outer core distribution pipe and the inner core distribution pipe.

[0013] Furthermore, a plurality of outer mold overflow components are annularly arranged on the outer side of the upper portion of the casting outer mold, and the outer mold overflow components include an outer mold overflow pipe and an outer mold sealing valve. The outer mold overflow pipe is connected to the outer core cavity, and the outer mold sealing valve is arranged on the outer mold overflow pipe. An outer mold overflow port is opened at the position of the outer mold overflow pipe corresponding to the upper portion of the casting outer mold, and the pouring height of the vibration-free concrete in the outer core cavity can be controlled and determined through the action of the outer mold overflow component.

[0014] Furthermore, a plurality of inner mold overflow components are annularly arranged on the inner side of the upper portion of the casting inner mold, the inner mold overflow components include an inner mold overflow pipe and an inner mold sealing valve, the inner mold overflow pipe is communicated with the inner core cavity, the inner mold sealing valve is arranged on the inner mold overflow pipe, and an inner mold overflow port is opened at the position of the inner mold overflow pipe corresponding to the upper portion of the casting inner mold, and the pouring height of the vibration-free concrete in the inner core cavity can be controlled and determined through the action of the inner mold overflow component.

[0015] A molding method based on the above-mentioned PCCP vibration-free concrete vacuum casting molding device includes the following steps: Step 1: Select the size of the outer core distribution pipe and the inner core distribution pipe according to the cavity sizes of the outer core cavity and the inner core cavity to ensure that the casting of the outer core cavity and the inner core cavity is completed at the same time.

[0016] Step 2: Connect the two ends of the outer core distribution pipe to the pump pipe and the outer core cavity respectively, and connect the two ends of the inner core distribution pipe to the pump pipe and the inner core cavity respectively.

[0017] Step 3: Open the vacuum pump, valve one and valve two of the outer core vacuum assembly and the inner core vacuum assembly at the same time, and extract the air from the outer core cavity and the inner core cavity to form a negative pressure vacuum cavity.

[0018] Step 4: Open the pumping equipment, the pump pipe valve and the discharge valve, and use the pumping equipment to transport the prepared vibration-free concrete to the outer core distribution pipe and the inner core distribution pipe through the pump pipe and the distribution plate, and pour the outer core cavity and the inner core cavity at the same time. Continuously draw the vacuum during the pouring of the outer core cavity and the inner core cavity.

[0019] Step 5: When non-vibration concrete is observed to flow out of the outer mold overflow pipe, the inner mold overflow pipe and the transparent tube, close the pumping equipment, the pump pipe valve and the discharge valve, as well as the vacuum pump, valve one and valve two of the outer core vacuum assembly and the inner core vacuum assembly; and open the outer mold sealing valve and the inner mold sealing valve.

[0020] Step 6: Disconnect the outer core vacuum assembly and the inner core vacuum assembly from the casting mold, and then clean the transparent tubes of the outer core vacuum assembly and the inner core vacuum assembly and the vibration-free concrete in the transparent discharge tube to complete the PCCP concrete pipe core casting work.

[0021] The present invention creates a vacuum negative pressure environment inside the casting mold before pouring the vibration-free concrete, so that the vibration-free concrete is pumped into the casting mold under the action of negative pressure, which can fundamentally eliminate the external quality defects such as surface pores, honeycombs, rough surfaces, water marks, etc. generated after the traditional vibration-type concrete is formed, solves the problem of aggregate sinking in the top area of ​​the PCCP concrete pipe core caused by vibration, improves the casting quality of the PCCP concrete pipe core, and improves the on-site construction efficiency.

[0022] Through the above technical solution, the beneficial effects of the present invention are: The present invention adopts vibration-free concrete to replace traditional vibrating concrete for casting the PCCP concrete pipe core. During the casting of the PCCP concrete pipe core, there is no need to vibrate the concrete, which can effectively avoid the appearance of quality defects such as pores, honeycombs, rough surfaces, water marks, etc. on the surface of the PCCP concrete pipe core after it is formed, and can also avoid the phenomenon of aggregate sinking in the top area of ​​the pipe core due to vibration; at the same time, before casting, a vacuum negative pressure environment is created inside the casting mold, so that the vibration-free concrete is pumped into the casting mold under the action of negative pressure, which can further avoid the appearance of quality defects on the pipe wall surface after the PCCP concrete pipe core is formed.

[0023] The present invention can respectively extract the air in the outer core cavity and the inner core cavity through the outer core vacuum component and the inner core vacuum component, so that the outer core cavity and the inner core cavity form a negative pressure vacuum cavity, creating a vacuum negative pressure casting environment, so that the vibration-free concrete can enter the outer core cavity and the inner core cavity respectively according to its own weight under the negative pressure environment, thereby achieving the effect of avoiding quality defects on the surface of the pipe wall after the PCCP concrete pipe core is formed.

[0024] The present invention pumps vibration-free concrete into the outer core cavity and the inner core cavity through a pumping mechanism, wherein a distribution plate plays a role in distributing the vibration-free concrete, and the outer core discharge port and the inner core discharge port on the distribution plate can be used to respectively transport the vibration-free concrete pumped into a pump pipe to the outer core distribution pipe and the inner core distribution pipe, thereby achieving the purpose of pumping the vibration-free concrete into the outer core cavity and the inner core cavity; wherein the casting height difference of the vibration-free concrete in the outer core cavity and the inner core cavity can be controlled by adjusting the diameters of the outer core distribution pipe and the inner core distribution pipe.

[0025] The outer mold overflow component of the present invention can control and determine the pouring height of the vibration-free concrete in the outer core cavity. When the vibration-free concrete poured in the outer core cavity reaches the overflow port of the outer mold, the vibration-free concrete can overflow to the overflow pipe of the outer mold for discharge; the inner mold overflow component can control and determine the pouring height of the vibration-free concrete in the inner core cavity. When the vibration-free concrete poured in the inner core cavity reaches the overflow port of the inner mold, the vibration-free concrete can overflow to the overflow pipe of the inner mold for discharge; thereby achieving the effect of controlling and determining the pouring height of the vibration-free concrete in the outer core cavity and the inner core cavity.

[0026] The present invention can also respectively control and determine the pouring height of the vibration-free concrete in the outer core cavity and the inner core cavity through the transparent tubes of the outer core vacuum component and the inner core vacuum component. The discharge transparent tube can prevent the vibration-free concrete from flowing back into the vacuum pump during vacuuming. The vibration-free concrete entering the transparent tube can enter the discharge transparent tube, thereby preventing the vibration-free concrete from reaching the vacuum pump through the vacuum pipeline. At the same time, the discharge transparent tube also facilitates the cleaning of the vibration-free concrete entering the transparent tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a PCCP vibration-free concrete vacuum casting and molding device of the present invention; Figure 2 The present invention Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle; Figure 3 It is a structural schematic diagram of a casting outer mold and a casting inner mold of the present invention; Figure 4 It is a structural schematic diagram of the pouring top form of the present invention.

[0028] The numbers in the accompanying drawings are: 1 is a pumping equipment, 2 is a pumping pipe, 3 is a pumping pipe valve, 4 is a material distribution plate, 5 is an outer core material distribution pipe, 6 is an inner core material distribution pipe, 7 is a casting outer mold, 8 is a casting inner mold, 9 is a steel cylinder, 10 is an outer core cavity, 11 is an inner core cavity, 12 is an outer mold overflow port, 13 is an outer mold overflow pipe, 14 is an outer mold sealing valve, 15 is an inner mold overflow port, 16 is an inner mold overflow pipe, 17 is an inner mold sealing valve, 18 is a casting top mold, 19 is an outer core feed port, 20 is an inner core feed port, 21 is a clamping ring, 22 is a sealing ring, 23 is a vacuum pump, 24 is a vacuum pipeline, 25 is a valve one, 26 is a valve two, 27 is a transparent tube, and 28 is a discharge transparent tube. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments: In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "horizontal", "vertical" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] like Figure 1 to Figure 4As shown, a PCCP vibration-free concrete vacuum casting and molding device includes a casting mold, a vacuum mechanism and a pumping mechanism. The casting mold includes a casting outer mold 7, a steel cylinder 9 and a casting inner mold 8 which are sequentially arranged from the outside to the inside. A casting top mold 18 is arranged on the top of the casting outer mold 7 and the casting inner mold 8. The gaps between the steel cylinder 9 and the casting outer mold 7 and the casting inner mold 8 respectively constitute an outer core cavity 10 and an inner core cavity 11. In this embodiment, the casting outer mold 7 is a cylindrical structure with a sealed lower end and an open upper end, wherein the diameter of the casting outer mold 7 is greater than the diameter of the steel cylinder 9, the diameter of the steel cylinder 9 is greater than the diameter of the casting inner mold 8, the steel cylinder 9 is located between the casting inner mold 8 and the casting outer mold 7, and the outer core cavity 10 and the inner core cavity 11 are formed by the action of the steel cylinder 9. The casting outer mold 7, the casting inner mold 8 and the casting top mold 18 cooperate with each other to form a casting mold for casting the PCCP concrete pipe core; before pouring the vibration-free concrete into the casting mold, it can be The vacuum mechanism extracts the air in the casting mold to create a vacuum negative pressure environment inside the casting mold, so as to avoid quality defects on the wall surface of the PCCP concrete pipe core after the PCCP concrete pipe core is formed; wherein the effect of pumping the vibration-free concrete into the outer core cavity 10 and the inner core cavity 11 is achieved by the pumping mechanism, wherein the vibration-free concrete is made of ordinary Portland cement, fly ash, mineral powder, sand and gravel aggregate and high-performance water reducing agent, and fiber reinforcement materials can also be added as needed, and the vibration-free concrete is mixed with a forced concrete mixer.

[0031] The vacuum mechanism includes an outer core vacuum component and an inner core vacuum component, the outer core vacuum component is connected to the casting outer mold 7, and the inner core vacuum component is connected to the casting inner mold 8. In this embodiment, the air in the outer core cavity 10 and the inner core cavity 11 is extracted by the outer core vacuum component and the inner core vacuum component respectively, so that the outer core cavity 10 and the inner core cavity 11 form negative pressure vacuum cavities respectively, creating a vacuum negative pressure casting environment, so that the vibration-free concrete enters the outer core cavity 10 and the inner core cavity 11 respectively according to its own weight under the negative pressure environment.

[0032] The pumping mechanism includes a pumping assembly and an outer core material distribution pipe 5 and an inner core material distribution pipe 6 connected to the pumping assembly, and the outer core material distribution pipe 5 and the inner core material distribution pipe 6 are respectively connected to the outer core cavity 10 and the inner core cavity 11. In this embodiment, the number of the outer core material distribution pipe 5 and the inner core material distribution pipe 6 are both three, and the vibration-free concrete is pumped into the outer core material distribution pipe 5 and the inner core material distribution pipe 6 through the pumping assembly, and the vibration-free concrete is poured into the outer core cavity 10 and the inner core cavity 11 at the same time.

[0033] The bottom of the casting top mold 18 is provided with clamping rings 21 corresponding to the casting outer mold 7, steel cylinder 9 and casting inner mold 8 respectively, and the bottom of the clamping ring 21 is provided with a clamping groove, and the inside of the clamping ring 21 is inlaid with a sealing ring 22, and the casting top mold 18 is clamped on the casting outer mold 7, steel cylinder 9 and casting inner mold 8 through the clamping groove. In this embodiment, the number of the clamping rings 21 at the bottom of the casting top mold 18 is three, and the diameters of the three clamping rings 21 are different, wherein the casting top mold 18 is clamped on the top of the casting outer mold 7, steel cylinder 9 and casting inner mold 8 through the clamping groove on the clamping ring 21, and the sealing ring 22 plays a role in sealing the connection between the casting top mold 18 and the casting outer mold 7, steel cylinder 9 and casting inner mold 18, thereby improving the airtightness of the casting mold, so as to facilitate vacuuming the casting mold.

[0034] The outer core vacuum assembly and the inner core vacuum assembly both include a vacuum pump 23, a vacuum pipe 24 and a transparent tube 27; the two ends of the vacuum pipe 24 are respectively connected to the transparent tube 27 and the suction end of the vacuum pump 23; the transparent tube 27 is connected to a discharge transparent tube 28; a valve 1 25 is provided on the vacuum pipe 24; a valve 2 26 is provided at the connection between the vacuum pipe 24 and the transparent tube 27; and a valve 3 is provided on the discharge transparent tube 28. In this embodiment, through the action of the transparent tube 27 and the vacuum pipe 24, the vacuum pump 23 can perform vacuum operation on the outer core cavity 10 and the inner core cavity 11. At the same time, the transparent tube 27 can also be used to control and determine the pouring height of the vibration-free concrete in the outer core cavity 10 and the inner core cavity 11. When the vibration-free concrete overflows in the transparent tube 27, that is, the height of the vibration-free concrete poured in the outer core cavity 10 and the inner core cavity 11 has reached the required height, the pouring of the vibration-free concrete into the outer core cavity 10 and the inner core cavity 11 is stopped.

[0035] One end of the transparent tube 27 of the outer core vacuum assembly is connected to the outer core cavity 10, and one end of the transparent tube 27 of the inner core vacuum assembly is connected to the inner core cavity 11. In this embodiment, the outer core cavity 10 is evacuated by the action of the vacuum pump 23 of the outer core vacuum assembly and the transparent tube 27 is connected with the vacuum pipe 24 and the outer core cavity 10; the inner core cavity 11 is evacuated by the action of the vacuum pump 23 of the inner core vacuum assembly and the transparent tube 27 is connected with the vacuum pipe 24 and the inner core cavity 11.

[0036] The pumping assembly includes a pumping device 1, a pumping pipe 2 and a distribution plate 4. One end of the pumping pipe 2 is connected to the discharge end of the pumping device 1, and the other end is connected to the distribution plate 4. A pumping pipe valve 3 is provided on the pumping pipe 2; and an outer core discharge port and an inner core discharge port are provided in a ring shape on the distribution plate 4. In this embodiment, the pumping device 1 adopts a concrete pump truck, and the concrete pump truck is used to pump vibration-free concrete into the casting mold. The pumping pipe valve 3 plays the role of opening and closing the pumping pipe 2. The number of the outer core discharge port and the inner core discharge port on the distribution plate 4 are both three. When the pumping device 1 is turned on, the pumping device 1 can pump the vibration-free concrete into the pumping pipe 2, and then the vibration-free concrete is distributed by the distribution plate 4, and the vibration-free concrete is discharged from the outer core discharge port and the inner core discharge port.

[0037] The casting top mold 18 is provided with an outer core feed port 19 and an inner core feed port 20 in a ring shape; the two ends of the outer core distribution pipe 5 are connected with the pumping pipe 2 and the outer core cavity 10 through the outer core discharge port and the outer core feed port 19 respectively, and the two ends of the inner core distribution pipe 6 are connected with the pumping pipe 2 and the inner core cavity 11 through the inner core discharge port and the inner core feed port 20 respectively; the connection between the outer core distribution pipe 5 and the inner core distribution pipe 6 and the distribution plate 4 is provided with a discharge valve, and the diameter of the outer core distribution pipe 5 is larger than the diameter of the inner core distribution pipe 6. In the present embodiment, there are three outer core feed ports 19 and three inner core feed ports 20 on the casting top mold 18, wherein the diameter of the outer core feed port 19 is larger than the diameter of the inner core feed port 20, and the discharge valve serves to open and close the outer core distribution pipe 5 and the inner core distribution pipe 6; the vibration-free concrete discharged from the outer core outlet is transported to the outer core cavity 10 by the outer core distribution pipe 5 through the outer core feed port 19, and the vibration-free concrete discharged from the inner core outlet is transported to the inner core cavity 11 by the inner core distribution pipe 6 through the inner core feed port 20; wherein the casting height difference of the vibration-free concrete in the outer core cavity 10 and the inner core cavity 11 can also be controlled by adjusting the diameters of the outer core distribution pipe 5 and the inner core distribution pipe 6, the purpose of which is to avoid excessive difference in the height of the vibration-free concrete in the outer core cavity 10 and the inner core cavity 11.

[0038] The upper outer side of the casting outer mold 7 is annularly provided with a plurality of outer mold overflow components, the outer mold overflow components include an outer mold overflow pipe 13 and an outer mold sealing valve 14, the outer mold overflow pipe 13 is connected to the outer core cavity 10, the outer mold sealing valve 14 is arranged on the outer mold overflow pipe 13, and an outer mold overflow port 12 is opened at the position of the outer mold overflow pipe 13 corresponding to the upper part of the casting outer mold 7. In this embodiment, the outer mold overflow assembly and the outer core vacuum assembly are on the same horizontal line. There are eleven outer mold overflow assemblies, which are evenly spaced and installed on the casting outer mold 7. The outer mold overflow pipe 13 is made of transparent material. Its purpose is to facilitate observation of whether there is vibration-free concrete overflowing in the outer mold overflow pipe 13. The outer mold sealing valve 14 plays the role of opening and closing the outer mold overflow pipe 13; the outer mold overflow assembly can control and determine the pouring height of the vibration-free concrete in the outer core cavity 10. When the vibration-free concrete poured in the outer core cavity 10 overflows into the outer mold overflow pipe 13 through the outer mold overflow port 12, the pouring of vibration-free concrete in the outer core cavity 10 is stopped.

[0039] The upper inner side of the casting inner mold 8 is provided with a plurality of inner mold overflow components in a ring shape, and the inner mold overflow components include an inner mold overflow pipe 16 and an inner mold sealing valve 17. The inner mold overflow pipe 16 is connected to the inner core cavity 11, and the inner mold sealing valve 17 is arranged on the inner mold overflow pipe 16. An inner mold overflow port 15 is opened at the position of the inner mold overflow pipe 16 corresponding to the upper part of the casting inner mold 8. In this embodiment, the inner mold overflow assembly and the inner core vacuum assembly are on the same horizontal line. There are three inner mold overflow assemblies, which are evenly spaced and installed on the casting inner mold 8. The inner mold overflow pipe 16 is made of a transparent material. The purpose is to observe whether there is vibration-free concrete overflowing from the inner mold overflow pipe 16. The inner mold sealing valve 17 plays the role of opening and closing the inner mold overflow pipe 16. The inner mold overflow assembly can control and determine the pouring height of the vibration-free concrete in the inner core cavity 11. When the vibration-free concrete poured in the inner core cavity 11 overflows into the inner mold overflow pipe 16 through the inner mold overflow port 15, the pouring of the vibration-free concrete in the inner core cavity 11 is stopped.

[0040] A molding method based on the above-mentioned PCCP vibration-free concrete vacuum casting molding device includes the following steps: Step 1: Select the size of the outer core dividing tube 5 and the inner core dividing tube 6 according to the cavity sizes of the outer core cavity 10 and the inner core cavity 11 to ensure that the pouring of the outer core cavity 10 and the inner core cavity 11 is completed at the same time, and control the pouring height difference of the vibration-free concrete in the outer core cavity 10 and the inner core cavity 11 by adjusting the diameters of the outer core dividing tube 5 and the inner core dividing tube 6 to avoid excessive difference in the height of the vibration-free concrete in the outer core cavity 10 and the inner core cavity 11.

[0041] Step 2: Connect the two ends of the outer core distribution pipe 5 to the pumping pipe 2 and the outer core cavity 10 respectively, and connect the two ends of the inner core distribution pipe 6 to the pumping pipe 2 and the inner core cavity 11 respectively. The two ends of the outer core distribution pipe 5 are respectively connected to the outer core discharge port of the distribution tray 4 and the outer core feed port 19 of the casting top mold 18; the two ends of the inner core distribution pipe 6 are respectively connected to the inner core discharge port of the distribution tray 4 and the inner core feed port 20 of the casting top mold 18.

[0042] Step 3: Open the vacuum pump 23, valve one 25 and valve two 26 of the outer core vacuum assembly and the inner core vacuum assembly at the same time, and extract the air from the outer core cavity 10 and the inner core cavity 11 to form a negative pressure vacuum cavity; before using the outer core vacuum assembly and the inner core vacuum assembly to evacuate the outer core cavity 10 and the inner core cavity 11, it is necessary to check the sealing of the connection between the casting top mold 18 and the casting outer mold 7, the casting inner mold 8 and the steel cylinder 9, as well as the sealing of the connection between each pipeline and the casting mold, wherein each pipeline and the casting mold are installed with sealing gaskets.

[0043] Step 4: Open the pumping equipment 1, the pump pipe valve 3 and the discharge valve, and transport the prepared vibration-free concrete to the outer core distribution pipe 5 and the inner core distribution pipe 6 through the pumping equipment 1 through the pump pipe 2 and the distribution plate 4, and pour the outer core cavity 10 and the inner core cavity 11 at the same time. During the pouring of the outer core cavity 10 and the inner core cavity 11, the vacuum is continuously drawn. During the continuous vacuum drawing of the outer core cavity 10 and the inner core cavity 11, the vibration-free concrete that enters the transparent tube 27 can enter the transparent discharge tube 28 to prevent the vibration-free concrete from flowing back into the vacuum pump 23.

[0044] Step 5: When non-vibration concrete is observed to flow out of the outer mold overflow pipe 13, the inner mold overflow pipe 16 and the transparent tube 27, close the pumping equipment 1, the pump pipe valve 3 and the discharge valve, as well as the vacuum pump 23, valve one 25 and valve two 26 of the outer core vacuum assembly and the inner core vacuum assembly; and open the outer mold sealing valve 14 and the inner mold sealing valve 17.

[0045] Step 6: Release the connection between the outer core vacuum assembly and the inner core vacuum assembly and the casting mold, and then clean the vibration-free concrete in the transparent tube 27 of the outer core vacuum assembly and the inner core vacuum assembly and the discharge transparent tube 28 to complete the PCCP concrete pipe core casting work.

[0046] The working principle of the present invention is as follows: when pouring the PCCP concrete pipe core, first open the vacuum pump 23 of the outer core vacuum assembly and the inner core vacuum assembly, open valve 1 25 and valve 2 26, close valve 3 on the discharge transparent tube 28, extract the air in the outer core cavity 10 and the inner core cavity 11, so that the air in the outer core cavity 10 and the inner core cavity 11 forms a negative pressure vacuum cavity, creating a vacuum negative pressure pouring environment; then open the pumping equipment 1, the pump pipe valve 3 and the outer core distribution pipe 5 and the unloading valve on the inner core distribution pipe 6, the prepared vibration-free concrete is pumped into the pump pipe 2 through the pumping equipment 1, and then the vibration-free concrete is distributed by the distribution plate 4, and the vibration-free concrete is discharged from the outer core discharge port and the inner core discharge port. The vibration-free concrete discharged from the outer core discharge port is transported to the outer core cavity 10 by the outer core distribution pipe 5 through the outer core feed port 19, and the vibration-free concrete discharged from the inner core discharge port is transported to the inner core cavity 11 by the inner core distribution pipe 6 through the inner core feed port 20.

[0047] While pouring the vibration-free concrete into the outer core cavity 10 and the inner core cavity 11, the outer core cavity 10 and the inner core cavity 11 are continuously evacuated, wherein the vibration-free concrete entering the transparent tube 27 enters the discharging transparent tube 28 to prevent the vibration-free concrete from flowing back into the vacuum pump 23; when it is observed that the vibration-free concrete flows out of the outer mold overflow pipe 13, the inner mold overflow pipe 16 and the transparent tube 27, the pumping equipment 1, the pump pipe valve 3 and the discharge valve, as well as the vacuum pump 23, valve one 25 and valve two 26 of the outer core vacuum component and the inner core vacuum component are closed; and the outer mold sealing valve 14 and the inner mold sealing valve 17 are opened, and the vibration-free concrete in the outer core cavity 10 overflows through the outer mold overflow port 12 to the outer mold overflow pipe 13 for discharge, and the vibration-free concrete in the inner core cavity 11 overflows through the inner mold overflow port 15 to the inner mold overflow pipe 16 for discharge. Then the vacuum mechanism is removed, and the vibration-free concrete in the transparent tube 27 of the outer core vacuum assembly and the inner core vacuum assembly and the discharging transparent tube 28 is cleaned to complete the PCCP concrete pipe core pouring work.

[0048] The embodiments described above are only preferred embodiments of the invention and are not intended to limit the scope of implementation of the invention. Therefore, any equivalent changes or modifications made according to the technical solutions described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A PCCP vibration-free concrete vacuum casting and molding device, characterized in that: The invention comprises a casting mold, a vacuum mechanism and a pumping mechanism, wherein the casting mold comprises a casting outer mold (7), a steel cylinder (9) and a casting inner mold (8) which are sequentially sleeved from the outside to the inside, a casting top mold (18) is arranged on the top of the casting outer mold (7) and the casting inner mold (8), and the gaps between the steel cylinder (9) and the casting outer mold (7) and the casting inner mold (8) respectively form an outer core cavity (10) and an inner core cavity (11); The vacuum mechanism comprises an outer core vacuum component and an inner core vacuum component, the outer core vacuum component is connected to the casting outer mold (7), and the inner core vacuum component is connected to the casting inner mold (8); The pumping mechanism comprises a pumping assembly and an outer core distribution pipe (5) and an inner core distribution pipe (6) connected to the pumping assembly, wherein the outer core distribution pipe (5) and the inner core distribution pipe (6) are respectively connected to the outer core cavity (10) and the inner core cavity (11).

2. A PCCP vibration-free concrete vacuum casting and forming device according to claim 1, characterized in that: The bottom of the casting top mold (18) is provided with clamping rings (21) corresponding to the casting outer mold (7), the steel cylinder (9) and the casting inner mold (8) respectively, and the bottom of the clamping ring (21) is provided with a clamping groove, and the inside of the clamping ring (21) is embedded with a sealing ring (22), and the casting top mold (18) is clamped on the casting outer mold (7), the steel cylinder (9) and the casting inner mold (8) through the clamping groove.

3. A PCCP vibration-free concrete vacuum casting and forming device according to claim 1, characterized in that: The outer core vacuum assembly and the inner core vacuum assembly both comprise a vacuum pump (23), a vacuum pipe (24) and a transparent tube (27); the two ends of the vacuum pipe (24) are respectively connected to the transparent tube (27) and the suction end of the vacuum pump (23); the transparent tube (27) is connected to a discharge transparent tube (28); a valve 1 (25) is provided on the vacuum pipe (24); a valve 2 (26) is provided at the connection between the vacuum pipe (24) and the transparent tube (27); and a valve 3 is provided on the discharge transparent tube (28).

4. A PCCP vibration-free concrete vacuum casting and forming device according to claim 3, characterized in that: One end of the transparent tube (27) of the outer core vacuum component is connected to the outer core cavity (10), and one end of the transparent tube (27) of the inner core vacuum component is connected to the inner core cavity (11).

5. A PCCP vibration-free concrete vacuum casting and forming device according to claim 1, characterized in that: The pumping assembly comprises a pumping device (1), a pumping pipe (2) and a material distribution plate (4); one end of the pumping pipe (2) is connected to the discharge end of the pumping device (1), and the other end is connected to the material distribution plate (4); a pumping pipe valve (3) is provided on the pumping pipe (2); and an outer core discharge port and an inner core discharge port are provided in an annular shape on the material distribution plate (4).

6. A PCCP vibration-free concrete vacuum casting and forming device according to claim 5, characterized in that: The casting top mold (18) is provided with an outer core feed port (19) and an inner core feed port (20) in a ring shape; the two ends of the outer core distribution pipe (5) are respectively connected to the pump pipe (2) and the outer core cavity (10) through the outer core discharge port and the outer core feed port (19); the two ends of the inner core distribution pipe (6) are respectively connected to the pump pipe (2) and the inner core cavity (11) through the inner core discharge port and the inner core feed port (20); the connection between the outer core distribution pipe (5) and the inner core distribution pipe (6) and the distribution plate (4) is provided with a discharge valve, and the diameter of the outer core distribution pipe (5) is larger than the diameter of the inner core distribution pipe (6).

7. A PCCP vibration-free concrete vacuum casting and forming device according to claim 1, characterized in that: A plurality of outer mold overflow components are arranged in an annular manner on the outer side of the upper portion of the casting outer mold (7), and the outer mold overflow components include an outer mold overflow pipe (13) and an outer mold sealing valve (14). The outer mold overflow pipe (13) is connected to the outer core cavity (10), and the outer mold sealing valve (14) is arranged on the outer mold overflow pipe (13). An outer mold overflow port (12) is provided at a position of the upper portion of the casting outer mold (7) corresponding to the outer mold overflow pipe (13).

8. A PCCP vibration-free concrete vacuum casting and forming device according to claim 1, characterized in that: A plurality of inner mold overflow components are arranged in an annular pattern on the inner side of the upper portion of the casting inner mold (8), the inner mold overflow components comprising an inner mold overflow pipe (16) and an inner mold sealing valve (17), the inner mold overflow pipe (16) being in communication with the inner core cavity (11), the inner mold sealing valve (17) being arranged on the inner mold overflow pipe (16), and an inner mold overflow port (15) being provided at a position of the upper portion of the casting inner mold (8) corresponding to the inner mold overflow pipe (16).

9. A molding method according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: selecting the sizes of the outer core distribution pipe (5) and the inner core distribution pipe (6) according to the sizes of the outer core cavity (10) and the inner core cavity (11) to ensure that the casting of the outer core cavity (10) and the inner core cavity (11) is completed at the same time; Step 2: connecting the two ends of the outer core distribution pipe (5) to the pump pipe (2) and the outer core cavity (10), and connecting the two ends of the inner core distribution pipe (6) to the pump pipe (2) and the inner core cavity (11); Step 3: Open the vacuum pump (23), valve 1 (25) and valve 2 (26) of the outer core vacuum assembly and the inner core vacuum assembly at the same time, and extract the air from the outer core cavity (10) and the inner core cavity (11) to form a negative pressure vacuum cavity; Step 4: Open the pumping equipment (1), the pumping pipe valve (3) and the discharge valve, and use the pumping equipment to transport the prepared vibration-free concrete through the pumping pipe (2) and the distribution plate (4) to the outer core distribution pipe (5) and the inner core distribution pipe (6), and simultaneously pour the outer core cavity (10) and the inner core cavity (11), and continue to draw a vacuum during the pouring of the outer core cavity (10) and the inner core cavity (11); Step 5: When non-vibration concrete is observed to flow out of the outer mold overflow pipe (13), the inner mold overflow pipe (16) and the transparent pipe (27), the pumping device (1), the pump pipe valve (3) and the discharge valve, as well as the vacuum pump (23), valve 1 (25) and valve 2 (26) of the outer core vacuum assembly and the inner core vacuum assembly are closed; and the outer mold sealing valve (14) and the inner mold sealing valve (17) are opened; Step 6: disconnect the outer core vacuum assembly and the inner core vacuum assembly from the casting mold, and then clean the vibration-free concrete in the transparent tube (27) of the outer core vacuum assembly and the inner core vacuum assembly and the discharge transparent tube (28), completing the PCCP concrete pipe core casting work.

Images