A modified sulfur concrete pipe welded by electric heat and a manufacturing method thereof

Abstract

The present invention discloses a modified sulfur concrete pipe with electric heat fusion and a manufacturing method thereof. The modified sulfur concrete pipe with electric heat fusion comprises a plurality of pipe fittings which are sequentially plugged in. One end of each pipe fitting is a tapered socket and the other end is a tapered socket. The tapered socket of the first pipe fitting is sleeved with the tapered socket of the second pipe fitting. An electric heating wire is arranged around the outer circumference of the tapered socket. The electric heating wire generates heat after being energized to hot-melt and fix the front and rear pipe fittings together. The pipe fitting is made of the following modified sulfur concrete formula material by a heating casting molding method. The modified sulfur concrete formula comprises the following raw materials in mass parts: 15%-24% of modified sulfur, 12%-21% of filler, 46%-55% of stone, and 18%-27% of sand. Due to the electric heat fusion connection method adopted, the modified sulfur concrete pipe body material of the present invention has a simple and reliable connection method, good sealing performance, and can greatly improve the construction efficiency compared with ordinary concrete pipe body materials.

Description

Technical Field

[0001] The invention relates to a pipe used in municipal engineering. Background Art

[0002] In municipal engineering and construction engineering, pipe body materials are an indispensable material. According to the source of materials, commonly used building pipe body materials can be divided into metal, plastic and concrete pipe body materials. Metal pipe body materials are easily corroded during long-term use, rust and scale appear, leakage and blockage occur, and they are easy to affect human health, which seriously restricts their application and development. Plastic pipe body materials have the advantages of light weight, smooth pipe wall, high chemical inertness and long life, and have been fully developed and applied. However, they also have defects such as poor mechanical properties, insufficient rigidity, flammability and heat resistance. Compared with plastic pipe body materials, concrete has the advantages of good quality, low cost, high inherent strength and high safety factor, and is widely used in urban underground pipeline systems. However, due to the poor sealing of the interface of concrete pipe body materials, its application is limited. For example, "Ministry of Construction Announcement No. 218" and "Su Jianke (2000) No. 351" restrict and prohibit flat-mouthed and tongue-and-groove concrete pipe body materials.

[0003] The quality of the pipe material connection method in the project is directly related to the transportation effect and service life of the pipeline network. Electric hot melt connection is an important method for connecting pipe materials. It can heat the electric heating wire embedded in the inner surface of the electric melting pipe by energizing it, so that the inner surface of the pipe fitting and the outer surface of the pipe material are melted respectively, and the purpose of welding is achieved after cooling to the required time. The electric hot melt connection method has very good connection performance and can connect pipe materials of different shapes, sizes and materials, so as to achieve the purpose of reducing weight, saving materials and optimizing resources. At the same time, the structural rigidity and integrity of the interface are large, and it is easy to ensure air tightness and water tightness, which is particularly suitable for high-strength and high-rigidity hollow structures (such as pipelines, etc.). However, the main materials that can be connected by electric hot melt are plastics and some metal pipe materials. Conventional concrete pipe materials can only be melted under strong acid due to their high melting point (>1000℃), making it difficult to connect in this way.

[0004] Modified sulfur concrete is a thermoplastic building material that uses modified sulfur instead of cement as a cementitious material. After heating to a certain temperature (about 140°C), the modified sulfur is melted, and then mixed with seasonings and aggregates. It solidifies and cools as the modified sulfur solidifies to form a thermoplastic building material. Compared with ordinary silicate concrete, it has greater compressive strength, tensile strength and elastic modulus. Modified sulfur concrete also has the advantages of good corrosion resistance, very low water absorption, impermeability, and can be melted and recycled repeatedly. In particular, due to the advantages of low melting point (about 120°C) and fast setting of modified sulfur concrete, it has great application potential in electric hot melt pipe body materials, but there are no relevant literature patents reported so far. Summary of the invention

[0005] In order to overcome the problem of poor sealing performance of interfaces of current concrete pipe materials, the present invention provides an electric hot-melt pipe fitting prepared by using modified sulfur concrete.

[0006] In order to achieve the above purpose, the present invention designs an electrothermal fusion modified sulfur concrete pipe, which includes a plurality of sequentially plugged pipes, characterized in that one end of each pipe is a tapered socket and the other end is a tapered spigot, the tapered socket of the front pipe is sleeved with the tapered spigot of the rear pipe, an electric heating wire is arranged around the outer circumference of the tapered spigot, and the electric heating wire generates heat after being energized to heat-melt and fix the front and rear pipes together, and the pipe is made of the following modified sulfur concrete formula materials through heating and casting molding method,

[0007] The modified sulfur concrete formula includes the following raw materials by mass: modified sulfur 15%-24%, filler 12%-21%, stone 46%-55%, sand 18%-27%.

[0008] Specifically, the modified sulfur is formed by sulfur and waste rubber powder, the mass percentage of the waste rubber powder in the modified sulfur is 35%-42%. The average particle size of the waste rubber powder is not greater than 5mm.

[0009] Specifically, the filler is one or more of quartz powder, mineral powder, cement powder, and the specific surface area of ​​the filler is not less than 300m 2 / kg.

[0010] Preferably, the stone is granite coarse aggregate.

[0011] Specifically, the sand is one or more of river sand, quartz sand, and machine-made sand.

[0012] Preferably, the outer wall of the tapered socket and the inner wall of the tapered insert are respectively wrapped with a steel ring to prevent the material from overheating, softening and deforming.

[0013] Preferably, the electric heating wire is spirally wound and provided with a connector for connecting to a power source.

[0014] Specifically, the pipe fitting is prepared by the following steps:

[0015] S 1 : Add sulfur and waste rubber powder into the pot together, heat them to the melting temperature of 135-146℃, and keep them warm for 30 minutes to ensure complete melting;

[0016] S 2 : Add the corresponding preheated filler into the molten modified sulfur and continue heating and stirring;

[0017] S 3 : Add the preheated stone and sand into the mixture of modified sulfur and filler, and heat and stir until it is uniform and semi-fluid;

[0018] S 4 : The heated mixture is injected into the mold through a pump, and after the temperature is cooled, the mold is demoulded to obtain the modified sulfur concrete pipe fittings;

[0019] S 5 : An electric heating wire is built at the conical socket of the obtained modified sulfur concrete pipe fitting.

[0020] Another object of the present invention is to provide a method for preparing the modified sulfur concrete pipe by electrothermal welding.

[0021] In order to achieve this purpose, the present invention adopts the following technical solutions:

[0022] A method for preparing a modified sulfur concrete pipe by electrothermal welding as described above, wherein the material formula of the modified sulfur concrete pipe used comprises the following raw materials by weight: 15%-24% modified sulfur, 12%-21% filler, 46%-55% stone, and 18%-27% sand, and is implemented according to the following manufacturing steps:

[0023] S 1 : Add sulfur and waste rubber powder into the pot together, heat them to the melting temperature of 135-146℃, and keep them warm for 30 minutes to ensure complete melting;

[0024] S 2 : Add the corresponding preheated filler into the molten modified sulfur and continue heating and stirring;

[0025] S 3 : Add the preheated stone and sand into the mixture of modified sulfur and filler, and heat and stir until it is uniform and semi-fluid;

[0026] S 4 : The heated mixture is injected into the mold through a pump, and after the temperature is cooled, the mold is demoulded to obtain the modified sulfur concrete pipe fittings;

[0027] S 5 : An electric heating wire is built at the conical socket of the obtained modified sulfur concrete pipe fitting.

[0028] Compared with the prior art, the advantages of the present invention are:

[0029] 1. The modified sulfur concrete pipe material of the present invention is superior to ordinary concrete and plastic pipe materials in mechanical properties, such as compressive strength, tensile strength and elastic modulus.

[0030] 2. The modified sulfur concrete pipe material of the present invention adopts an electric hot-melt connection method, which is simple and reliable, has good sealing performance, and can greatly improve construction efficiency compared with ordinary concrete pipe materials. Since the conical socket end of the pipe material and the conical socket end of the connected pipe material are integrated, the conical socket of the pipe material will not fall off in the case of terrain settlement changes, preventing leakage and collapse accidents caused by foundation settlement deformation, and having high safety.

[0031] 3. The melting point of the modified sulfur concrete pipe material of the present invention (~120°C) is lower than that of the currently commonly used plastic pipe material (~200°C). Therefore, the thermal work required in the electric hot melt connection process is lower, which greatly reduces the energy consumption. The electric hot melt modified sulfur concrete pipe material of the present invention can be widely used in the fields of urban drainage, electricity, petrochemical, coal mine ventilation, etc.

[0032] 4. The socket and the spigot of the present invention are tapered, which can well ensure that the pipe sections are spliced ​​and fit each other, and has a strong ability to eliminate errors generated in the manufacturing process.

[0033] 5. The outer wall of the socket and the inside of the plug of the present invention are provided with steel rings, which can prevent the material from being partially softened and deformed due to improper heating control. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural diagram of the appearance of the modified sulfur concrete pipe welded by electric heat according to the present invention.

[0035] Figure 2 It is a cross-sectional view of the modified sulfur concrete pipe welded by electric heat according to the present invention.

[0036] Figure 3 It is an external schematic diagram of the splicing of modified sulfur concrete pipes welded by electric heat welding according to the present invention.

[0037] Figure 4 It is a cross-sectional view of the splicing of modified sulfur concrete pipes welded by electric heat welding of the present invention.

[0038] Among them, pipe fittings 1, socket 2, plug 3, electric heating wire 4, electrode joint 5, socket outer wall steel plate lining 6, plug inner wall steel plate lining 7, special power adapter 8 DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0040] Example 1

[0041] A modified sulfur concrete pipe welded by electric heat welding, such as Figure 1 to Figure 4 As shown, it includes several sections of pipe fittings that are plugged in sequentially. One end of each section of pipe fitting is a tapered socket and the other end is a tapered plug. The tapered socket of the previous section of pipe fitting is sleeved with the tapered plug of the next section of pipe fitting. The outer circumference of the tapered plug is provided with multiple turns of electric heating wire 4, which is spirally wound and provided with an electrode connector for connecting to a power source. The electric heating wire generates heat after power is turned on, so that the inner and outer walls of the front and rear pipe fittings are hot-melted and fixed together. The outer wall of the tapered socket and the inner wall of the tapered plug are respectively wrapped with a circle of steel plate lining to prevent the material from overheating, softening and deforming.

[0042] The formula materials of the pipe fittings are (by mass): modified sulfur 15%, cement powder 14%, granite coarse aggregate 51%, river sand 20%;

[0043] The modified sulfur formula materials are (by mass): 38% of waste rubber powder and 62% of sulfur;

[0044] The pipe fitting is prepared by the following steps:

[0045] S 1 : Add sulfur and waste rubber powder into the pot together, heat them to the melting temperature of 135-146℃, and keep them warm for 30 minutes to ensure complete melting;

[0046] S 2 : Add the corresponding preheated cement filler into the molten modified sulfur and continue heating and stirring;

[0047] S 3 : Add the preheated granite and river sand into the mixture of modified sulfur and cement filler, and heat and stir until it is uniform and semi-fluid;

[0048] S 4 : The heated mixture is injected into the mold through a pump, cooled at room temperature for 1 hour, and then demoulded to obtain modified sulfur concrete pipe fittings;

[0049] S 5 : An electric heating wire is built at the conical socket of the obtained modified sulfur concrete pipe fitting.

[0050] As shown in the figure, when connecting the pipe materials, you only need to insert the tapered socket of the pipe fitting into the tapered socket of the adjacent pipe material. After power is turned on, the metal coil heats up to connect the adjacent pipe materials to form a sealed connection.

[0051] The compressive strength of this modified sulfur concrete pipe is 62.3MPa and the flexural strength is 11.9MPa.

[0052] Embodiment 2

[0053] The pipe structure in this example is the same as that in the first embodiment.

[0054] The formula materials of the pipe fittings are (by mass): modified sulfur 17%, mineral powder 14%, granite coarse aggregate 50%, machine-made sand 19%;

[0055] The modified sulfur formula materials are (by mass): 40% of waste rubber powder and 60% of sulfur;

[0056] The pipe fitting preparation steps are the same as in Example 1.

[0057] The compressive strength of this modified sulfur concrete pipe is 61.1MPa and the flexural strength is 12.5MPa.

[0058] Embodiment 3

[0059] The pipe structure in this example is the same as that in the first embodiment.

[0060] The formula materials of the pipe fittings are (by mass): 16% modified sulfur, 13% quartz powder, 50% granite coarse aggregate, and 21% quartz sand.

[0061] The modified sulfur formula materials are (by mass): 42% of waste rubber powder and 58% of sulfur;

[0062] The pipe fitting preparation steps are the same as in Example 1.

[0063] The compressive strength of this modified sulfur concrete pipe reaches 63.4MPa and the flexural strength reaches 10.3MPa.

Claims

1. An electrothermal-welded modified sulfur concrete pipe, comprising a plurality of pipes connected in sequence, characterized in that: One end of each pipe fitting is a tapered socket and the other end is a tapered plug. The tapered socket of the front pipe fitting is sleeved with the tapered plug of the rear pipe fitting. An electric heating wire is arranged around the outer circumference of the tapered plug. The electric heating wire generates heat after being energized to hot-melt and fix the front and rear pipe fittings together. The pipe fitting is made of the following modified sulfur concrete formula by heating and casting. The modified sulfur concrete formula includes the following raw materials in parts by mass: 15%-24% modified sulfur, 12%-21% filler, 46%-55% stone, and 18%-27% sand. The modified sulfur is formed by sulfur and waste rubber powder, the mass percentage of the waste rubber powder in the modified sulfur is 35%-42%, and the average particle size of the waste rubber powder is not greater than 5mm.

2. The modified sulfur concrete pipe welded by electric heat welding according to claim 1 is characterized in that: The filler is one or more of quartz powder, mineral powder, cement powder, and the specific surface area of ​​the filler is not less than 300m 2 / kg.

3. The modified sulfur concrete pipe welded by electric heat welding according to claim 1 is characterized in that: The stone material is granite coarse aggregate.

4. The modified sulfur concrete pipe welded by electric heat welding according to claim 1 is characterized in that: The sand is one or more of river sand, quartz sand and machine-made sand.

5. The electrothermal fusion modified sulfur concrete pipe according to claim 1, characterized in that: The outer wall of the tapered socket and the inner wall of the tapered plug are respectively wrapped with a steel ring to prevent the material from being overheated, softened and deformed.

6. The electrothermal fusion modified sulfur concrete pipe according to claim 1, characterized in that: The electric heating wire is spirally wound and provided with a connector for connecting to a power source.

7. The modified sulfur concrete pipe welded by electric heat welding according to claim 1 is characterized in that: The pipe fitting is prepared by the following steps: S1: Add sulfur and waste rubber powder into the pot together, heat them to the melting temperature of 135-146℃, and keep them warm for 30 minutes to ensure that they are completely melted; S2: adding the corresponding preheated filler into the molten modified sulfur, and continue heating and stirring; S3: Add the preheated stone and sand into the mixture of modified sulfur and filler, and heat and stir until it is uniform and semi-fluid; S4: injecting the heated mixture into the mold through a pump, and after the temperature is cooled, demoulding to obtain modified sulfur concrete pipe fittings; S5: Building an electric heating wire at the conical socket of the obtained modified sulfur concrete pipe.

8. A method for preparing an electrothermal-fused modified sulfur concrete pipe as claimed in any one of claims 1 to 6, characterized in that The material formula of the modified sulfur concrete pipe includes the following raw materials by mass: modified sulfur 15%-24%, filler 12%-21%, stone 46%-55%, sand 18%-27%, and is implemented according to the following manufacturing steps: S1: Add sulfur and waste rubber powder into a pot together, heat them to a melting temperature of 135-146°C, and keep them warm for 30 minutes to ensure complete melting; S2: adding the corresponding preheated filler into the molten modified sulfur, and continue heating and stirring; S3: Add the preheated stone and sand into the mixture of modified sulfur and filler, and heat and stir until it is uniform and semi-fluid; S4: injecting the heated mixture into the mold through a pump, and after the temperature is cooled, demoulding to obtain modified sulfur concrete pipe fittings; S5: Building an electric heating wire at the conical socket of the obtained modified sulfur concrete pipe.

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