Non-fine concrete water filter pipe based on 3D printing and preparation method of non-fine concrete water filter pipe

Abstract

The invention discloses a non-fine concrete water filter pipe based on 3D printing and a preparation method thereof.The water filter pipe comprises a plurality of pipe bodies which are connected with one another and are of a hollow cylinder structure, rabbets are formed in connectors of the upper ends and the lower ends of the pipe bodies, every two adjacent pipe bodies are connected with one another through the rabbets, and the connectors of the pipe bodies are wrapped with dense meshes. The water filter pipe is prepared through the 3D printing technology, and the non-fine concrete water filter pipe manufactured through the preparation method can accurately describe the basic characteristics of pipe body samples such as the pipe body size, the connector shape and the porosity.

Description

Technical Field

[0001] The invention belongs to the field of building materials and relates to a concrete water filter pipe, in particular to a sandless concrete water filter pipe based on 3D printing and a preparation method thereof. Background Art

[0002] The main function of the precipitation well filter pipe is to let in water, and it can also filter some impurities to prevent soil or rock particles around the well wall from flowing into the well and blocking the well pipe. It also has the function of supporting and protecting the well wall. The manufacturing process of traditional concrete filter pipes is complicated and costly. The shape of the upper and lower pipe interfaces is difficult to manufacture, which easily leads to large gaps at the interfaces, causing soil particles to be lost and impurities to flow into the pipe.

[0003] 3D printing technology is a type of rapid prototyping technology, also known as additive manufacturing technology. It is based on digital models and uses adhesive materials to construct objects by stacking and accumulating layer by layer. It is considered to be a landmark technology of the "Third Industrial Revolution". Compared with traditional grinding and cutting processes, 3D printing technology has the advantage of saving materials. Using 3D printing technology to print concrete avoids the use of templates and a lot of manpower, saving time and labor costs. However, 3D printing concrete has high requirements for materials. Since large-size coarse aggregates are prone to cause material discontinuity or block the printing machine, it is currently only applicable to small-size fine aggregate mortar, which makes 3D printing of conventional concrete more difficult. Therefore, how to use 3D to print a drainage well filter pipe has become a major problem for technicians in this field. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a sandless concrete water filter pipe based on 3D printing and a preparation method thereof. The 3D printing technology is used to accurately control the various parameters of the water filter pipe and realize low-cost production of high-quality water filter pipes.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] The present invention first proposes a sandless concrete water filter pipe based on 3D printing, comprising a plurality of interconnected sections of a hollow cylindrical pipe body, wherein tongues and grooves are arranged at the interfaces of the upper and lower ends of the pipe body, and two adjacent sections of the pipe body are interconnected through the tongues and grooves, and a dense mesh is wrapped at the interface of the pipe body.

[0007] Furthermore, the pipe body of the sandless concrete water filter pipe located at the coarse-grained stratum is wrapped with a dense mesh.

[0008] Furthermore, the above-mentioned dense mesh is 60 meshes.

[0009] Based on the above sandless concrete water filter pipe, the present invention also proposes a method for preparing the water filter pipe, comprising the following steps:

[0010] Step 1), establishing a three-dimensional digital structure model of the water filter pipe, and then slicing it and importing it into a 3D printer;

[0011] Step 2), cement, aggregate, mortar lubricant, water, foaming agent and high-strength gypsum are weighed in proportion and mixed evenly to form printing raw materials; the components of the raw materials are mixed according to the following mass proportions:

[0012] 1.0-1.2 parts of cement, 1.0-1.2 parts of aggregate, 0.004-0.005 parts of mortar lubricant, 0.32-0.35 parts of water, 0.001 parts of foaming agent, 0.20-0.25 parts of gypsum;

[0013] Step 3), sending the printing raw materials mixed evenly in step 2) to a concrete extruder and waiting for printing;

[0014] Step 4), the printing material is squeezed into the print head by the extruder, and then the print head starts printing the first layer according to the set printing parameters;

[0015] Step 5), after the first layer is printed, the print head is lifted up by 25 mm, and the second layer of the original paste is printed. The printing parameters are the same as the first layer, and the printing is repeated upward until the 1 / 2 height of the tube body is printed, and the printing is paused and the first part is left to harden and form;

[0016] Step 6), when the hardening molding of step 5) is completed, continue to repeat the printing process of step 5 until the tube body is printed, and wait for hardening molding;

[0017] Step 7), printing a tongue and groove on the tube body printed in step 6), and waiting for hardening and forming;

[0018] Step 8), the pipe body printed in step 7) is covered with cloth and watered and cured at room temperature for 7 days to form a finished pipe section of a sand concrete water filter pipe.

[0019] Furthermore, in the above step 1), Sketchup software is used to build a water filter pipe model, and the upper and lower pipe interfaces are made into tongues and grooves, which are then exported as STL format files. The STL format files are then imported into Cura slicing software to slice the model with a slice thickness of 25 mm. After slicing, the model is exported as a G-Code file and imported into a concrete 3D printer.

[0020] Furthermore, in step 2), the cement is silicate cement; the aggregate is gravel; the mortar lubricant is sodium lauryl sulfate and cellulose; the foaming agent is animal fat foaming agent; and the gypsum is high-strength gypsum.

[0021] Furthermore, the particle size of the above-mentioned aggregate is 2-4 mm; and the high-strength gypsum is α high-strength gypsum.

[0022] Furthermore, in the above step 7, the tongue and groove at the upper end of the tube body is printed first, and after hardening and forming, the tube body is inverted and the tongue and groove at the lower end is printed.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The preparation method of the sandless concrete water filter pipe based on 3D printing of the present invention can accurately control the various dimensional parameters and interface shapes of the concrete water filter pipe. The preparation method is simple, low-cost, environmentally friendly, and sound-absorbing and noise-reducing, avoiding the shortcomings of the traditional method such as poor economy and environmental pollution. At the same time, the indoor test is easy to operate, highly repeatable, the sample characteristics are relatively similar, and the structure is reliable.

[0025] (2) The present invention utilizes 3D printing technology to improve the degree of automation in the production of sandless concrete water filter pipes, saving time and labor costs, and at the same time avoiding the problems of material discontinuity and printer clogging caused by the use of large-size coarse aggregates.

[0026] (3) The sandless concrete water filter pipe obtained by the method of the present invention can not only allow water to enter, but also prevent the particles of soil or rock around the well wall from flowing into the well, causing defects such as clogging of the filter holes, short service life or low water filtration efficiency, and at the same time it also supports and protects the well wall so that the pumping holes can be used normally. The basic characteristics of the water filter pipe, such as wall thickness, height, interface shape and porosity, can be controlled, thus providing a new method for making concrete water filter pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flowchart of the preparation method of the present invention;

[0028] Figure 2 The three-dimensional model diagram established in Sketchup modeling software, where (a) is a schematic diagram of the lower tongue and groove, and (b) is a schematic diagram of the upper tongue and groove;

[0029] Figure 3 This is a slice image from Cura software. DETAILED DESCRIPTION

[0030] The sandless concrete water filter pipe based on 3D printing of the present invention comprises a plurality of interconnected hollow cylindrical pipe bodies, wherein the upper and lower end interfaces of the pipe body are provided with a tongue and groove, and two adjacent pipe bodies are interconnected through the tongue and groove, and a dense mesh is wrapped at the pipe body interface. The sandless concrete water filter pipe is wrapped with a dense mesh on the pipe body located at the coarse-grained stratum. The dense mesh is most preferably a 60-mesh dense mesh.

[0031] In order to make the advantages of the present invention more prominent, the purpose and technical solution more clear, the present invention is described in detail below with reference to the accompanying drawings and embodiments. However, the embodiments described here are only used to explain the present invention and should not be regarded as limiting the scope of the present invention.

[0032] The following is a detailed description of the method for making a sandless concrete water filter pipe according to the present invention in conjunction with the accompanying drawings. According to experimental research, the porosity of the water filter pipe is at least 20%, and the effective porosity is about 50% of the porosity of the water inlet surface of the water filter pipe, achieving the water inlet effect. The upper and lower pipe interfaces of the water filter pipe are made into a tongue-and-groove shape, which can better meet the function of preventing the loss of soil particles.

[0033] Example 1

[0034] The preparation method of the sandless concrete water filter pipe based on 3D printing in this embodiment (the specific flow chart is as follows Figure 1 As shown), comprising the following steps:

[0035] Step 1, determine the geometric model size of the water filter pipe: according to the experimental requirements, set the height of the sandless concrete water filter pipe to 95cm, the outer diameter to 46cm, the inner diameter to 38cm, and the wall thickness to 4cm. The present invention has specific requirements for the various dimensional parameters of the pipe body, which can be flexibly set according to the needs. Figure 2 (a) and Figure 2 (b) shows: Use Sketchup software to build a water filter pipe model, and make the upper and lower pipe interfaces as tongue and groove, and then export it to STL format;

[0036] Step 2, such as Figure 3 As shown: the established three-dimensional digital structure model is sliced: the STL format file is imported into the Cura slicing software to slice the model, and the slice thickness is 25mm. After slicing, it is output as a G-Code file for recognition by the concrete 3D printer;

[0037] Step 3, select the materials required for making the water filter pipe, namely: cement, aggregate, mortar lubricant, water, foaming agent, high-strength gypsum;

[0038] Specifically, according to the predetermined porosity requirement, the mass ratio of the cement, the aggregate, the mortar lubricant, water, the foaming agent and the high-strength gypsum is 1:1:0.005:0.32:0.001:0.2. Among them, the cement is silicate cement; the aggregate is stone with a particle size of 2-4 mm; the mortar lubricant is sodium dodecyl sulfate and cellulose; the foaming agent is an animal fat foaming agent; the high-strength gypsum is α high-strength gypsum;

[0039] Step 4, pouring the raw materials in step 3 into a concrete mixer and stirring until they are evenly mixed;

[0040] Specifically, first add aggregate, cement and high-strength gypsum into the hopper of the concrete mixer, stir the dry materials evenly, then add the foaming agent into the water and stir evenly, then add about 1 / 2 of the weight of water and mortar lubricant into the hopper and start stirring for 3 minutes, then observe the mixing situation, and finally slowly add the remaining water and continue stirring for 3-5 minutes, and turn off the mixer until the mixture is evenly mixed.

[0041] Step 5: Send the raw materials mixed evenly in step 4 to the concrete extruder and wait for printing

[0042] Step 6: The printing material is squeezed into the print head by the extruder, and the print head starts printing the first layer according to the computer instructions;

[0043] Step 7: Lift the print head 25mm upwards and start printing the second layer of concrete. The printing parameters are the same as the first layer.

[0044] Step 8, repeat step 7 several times until the height of the printed tube reaches 1 / 2, and wait for the first part to harden and form;

[0045] Step 9, repeat step 8 on the basis of the first part and wait for hardening and forming;

[0046] Step 10, print the tongue and groove on the main part and wait for hardening and forming.

[0047] Specifically, the nozzle diameter of the print head is 25 mm, the printing speed is 30 mm / s, and the minimum printing time for each layer is 3 min.

[0048] Specifically, the extrusion device starts to extrude the evenly mixed raw materials into the print head, and the print head starts to print the first layer according to the computer instructions. The printing path is a ring. When the concrete printed out of the first layer is connected end to end in a ring, the extrusion device is turned off to stop extrusion, the print head is lifted up by 20 mm, the extrusion device is turned on to continue extruding to the print head, and the second layer printing is started. Then, the above steps are repeated to print layer by layer from bottom to top until 1 / 2 height of the printed tube body is reached, and then the first part is hardened and formed; the above steps are repeated on the basis of the first part until the main part is printed, and then it is continued to wait for hardening and forming; the tongue and groove part is printed on the upper end of the main part, and it is inverted after hardening to reach sufficient strength, and the tongue and groove at the lower end of the tube body is printed, and it is continued to wait for hardening.

[0049] Step 11, cover the printed water filter pipe with cloth and water it and cure it at room temperature for 7 days.

[0050] Example 2

[0051] This embodiment includes the following steps:

[0052] Step 1), establish a three-dimensional digital structure model of the water filter pipe, and then slice it and import it into the 3D printer; specifically, use Sketchup software to establish the water filter pipe model, and make the upper and lower pipe interfaces as tongues and grooves, and then export it as an STL format file, and then import the STL format file into Cura slicing software to slice the model, with a slice thickness of 25 mm. After slicing, export it as a G-Code file and import it into the concrete 3D printer.

[0053] Step 2), cement, aggregate, mortar lubricant, water, foaming agent and high-strength gypsum are weighed in proportion and mixed evenly to form printing raw materials; the components of the raw materials are mixed according to the following mass proportions:

[0054] 1.2 parts of cement, 1.2 parts of aggregate, 0.004 parts of mortar lubricant, 0.35 parts of water, 0.001 parts of foaming agent, and 0.25 parts of gypsum.

[0055] The above cement is silicate cement; the aggregate is stone; the mortar lubricant is sodium dodecyl sulfate and cellulose; the foaming agent is animal fat foaming agent; the gypsum is high-strength gypsum. The particle size of the aggregate is 2-4mm; the high-strength gypsum is α high-strength gypsum.

[0056] Step 3), sending the printing raw materials mixed evenly in step 2) to a concrete extruder and waiting for printing;

[0057] Step 4), the printing material is squeezed into the print head by the extruder, and then the print head starts printing the first layer according to the set printing parameters;

[0058] Step 5), after the first layer is printed, the print head is lifted up by 25 mm, and the second layer of the original paste is printed. The printing parameters are the same as the first layer, and the printing is repeated upward until the 1 / 2 height of the tube body is printed, and the printing is paused and the first part is left to harden and form;

[0059] Step 6), when the hardening molding of step 5) is completed, continue to repeat the printing process of step 5 until the tube body is printed, and wait for hardening molding;

[0060] Step 7), printing the tongue and groove on the tube body printed in step 6), and waiting for hardening and forming. In this step, the tongue and groove on the upper end of the tube body are first printed, and after hardening and forming, the tube body is turned upside down and the tongue and groove on the lower end are printed.

[0061] Step 8), the pipe body printed in step 7) is covered with cloth and watered and cured at room temperature for 7 days to form a finished pipe section of a sand concrete water filter pipe.

[0062] Example 3

[0063] This embodiment includes the following steps:

[0064] Step 1), establish a three-dimensional digital structure model of the water filter pipe, and then slice it and import it into the 3D printer; specifically, use Sketchup software to establish the water filter pipe model, and make the upper and lower pipe interfaces as tongues and grooves, and then export it as an STL format file, and then import the STL format file into Cura slicing software to slice the model, with a slice thickness of 25 mm. After slicing, export it as a G-Code file and import it into the concrete 3D printer.

[0065] Step 2), cement, aggregate, mortar lubricant, water, foaming agent and high-strength gypsum are weighed in proportion and mixed evenly to form printing raw materials; the components of the raw materials are mixed according to the following mass proportions:

[0066] 1.1 parts of cement, 1.1 parts of aggregate, 0.0045 parts of mortar lubricant, 0.33 parts of water, 0.001 parts of foaming agent, and 0.22 parts of gypsum.

[0067] The above cement is silicate cement; the aggregate is stone; the mortar lubricant is sodium dodecyl sulfate and cellulose; the foaming agent is animal fat foaming agent; the gypsum is high-strength gypsum. The particle size of the aggregate is 2-4mm; the high-strength gypsum is α high-strength gypsum.

[0068] Step 3), sending the printing raw materials mixed evenly in step 2) to a concrete extruder and waiting for printing;

[0069] Step 4), the printing material is squeezed into the print head by the extruder, and then the print head starts printing the first layer according to the set printing parameters;

[0070] Step 5), after the first layer is printed, the print head is lifted up by 25 mm, and the second layer of the original paste is printed. The printing parameters are the same as the first layer, and the printing is repeated upward until the 1 / 2 height of the tube body is printed, and the printing is paused and the first part is left to harden and form;

[0071] Step 6), when the hardening molding of step 5) is completed, continue to repeat the printing process of step 5 until the tube body is printed, and wait for hardening molding;

[0072] Step 7), printing the tongue and groove on the tube body printed in step 6), and waiting for hardening and forming. In this step, the tongue and groove on the upper end of the tube body are first printed, and after hardening and forming, the tube body is turned upside down and the tongue and groove on the lower end are printed.

[0073] Step 8), the pipe body printed in step 7) is covered with cloth and watered and cured at room temperature for 7 days to form a finished pipe section of a sand concrete water filter pipe.

[0074] In the preparation method of the sandless concrete water filter pipe based on 3D printing of the present invention, a water filter pipe with a certain porosity, size and interface shape is produced according to the demand, and the water filter pipe sample obtained by the 3D printing technology is applied to various urban construction studies. According to specific experimental requirements, the water filter pipes with different sizes, different interface shapes and different porosities can be produced quickly, simply, time-savingly and accurately by relying on the automation of 3D printing equipment, which provides a new idea for studying the water filter pipe of the precipitation well.

[0075] Although the present invention has been described in detail with general descriptions and specific embodiments in this specification,

[0076] However, based on the present invention, anyone familiar with the technology can make some modifications or improvements to the above embodiments without violating the spirit and scope of the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention should still be covered by the claims of the present invention.

Claims

1. A sandless concrete water filter pipe based on 3D printing, characterized in that: It comprises a plurality of interconnected hollow cylindrical tubes, wherein the upper and lower end interfaces of the tube are provided with tongues and grooves, two adjacent tubes are interconnected through the tongues and grooves, and a dense mesh is wrapped at the interface of the tube.

2. The sandless concrete water filter pipe based on 3D printing according to claim 1 is characterized in that: The pipe body of the sandless concrete water filter pipe located at the coarse-grained stratum is wrapped with a dense mesh.

3. The sandless concrete water filter pipe based on 3D printing according to claim 1 or 2, characterized in that: The dense mesh is 60 meshes.

4. A method for preparing a sandless concrete water filter pipe based on 3D printing according to claim 1, characterized in that: The following steps are involved: Step 1), establishing a three-dimensional digital structure model of the water filter pipe, and then slicing it and importing it into a 3D printer; Step 2), cement, aggregate, mortar lubricant, water, foaming agent and high-strength gypsum are weighed in proportion and mixed evenly to form printing raw materials; The components of the raw materials are mixed according to the following mass proportions: 1.0-1.2 parts of cement, 1.0-1.2 parts of aggregate, 0.004-0.005 parts of mortar lubricant, 0.32-0.35 parts of water, 0.001 parts of foaming agent, 0.20-0.25 parts of gypsum; Step 3), sending the printing raw materials mixed evenly in step 2) to a concrete extruder and waiting for printing; Step 4), the printing material is squeezed into the print head by the extruder, and then the print head starts printing the first layer according to the set printing parameters; Step 5), after the first layer is printed, the print head is lifted up by 25 mm, and the second layer of the original paste is printed. The printing parameters are the same as the first layer, and the printing is repeated upward until the 1 / 2 height of the tube body is printed, and the printing is paused and the first part is left to harden and form; Step 6), when the hardening molding of step 5) is completed, continue to repeat the printing process of step 5 until the tube body is printed, and wait for hardening molding; Step 7), printing a tongue and groove on the tube body printed in step 6), and waiting for hardening and forming; Step 8), the pipe body printed in step 7) is covered with cloth and watered and cured at room temperature for 7 days to form a finished pipe section of a sand concrete water filter pipe.

5. The preparation method according to claim 4, characterized in that: In step 1), Sketchup software was used to build a water filter pipe model, and the upper and lower pipe interfaces were made into tongues and grooves, which were then exported as STL format files. The STL format files were then imported into Cura slicing software to slice the model with a slice thickness of 25 mm. After slicing, the model was exported as a G-Code file and imported into a concrete 3D printer.

6. The preparation method according to claim 4, characterized in that: In step 2), the cement is silicate cement; the aggregate is gravel; the mortar lubricant is sodium lauryl sulfate and cellulose; the foaming agent is animal fat foaming agent; and the gypsum is high-strength gypsum.

7. The preparation method according to claim 6, characterized in that: The particle size of the aggregate is 2-4 mm; the high-strength gypsum is α high-strength gypsum.

8. The preparation method according to claim 4, characterized in that: In step 7), the tongue and groove at the upper end of the tube body are printed first, and after hardening and forming, the tube body is turned upside down and the tongue and groove at the lower end are printed.

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