A 3D printing nozzle for printing emergency horizontal barrier for contaminated sites

Abstract

The present invention discloses a 3D printing nozzle for printing an emergency horizontal barrier for a contaminated site. A reinforcing wire assembly and a reinforcing net assembly are installed on the nozzle housing. During the printing process of the horizontal barrier strip, reinforcing nets and reinforcing wires can be laid on the top and sides of the printing tape to form a composite barrier, improve the molding quality of the barrier, effectively control the migration of pollutants or block the exposure pathway of pollutants, and achieve efficient emergency disposal of sudden soil environmental pollution events. The 3D printing nozzle includes a nozzle housing, a discharge molding port located at the bottom of the nozzle housing, a reinforcing wire assembly and a reinforcing net assembly located outside the nozzle housing; the reinforcing wire assembly is connected to one side of the nozzle housing, and the reinforcing net assembly is connected to the front of the nozzle housing; when working, the discharge molding port flows out the printing tape constituting the horizontal barrier.

Description

Technical Field

[0001] The present invention belongs to the field of construction of structures in contaminated sites, and in particular, relates to a 3D printing nozzle for printing emergency horizontal barrier of contaminated sites. Background Art

[0002] The emergency response to sudden environmental pollution incidents is an international problem. Sudden environmental pollution incidents are characterized by uncertainty and concentrated discharge of pollutants in a short period of time. If not controlled in time, they will have a bad impact on environmental media such as surface soil, groundwater, and atmosphere, as well as surrounding humans, vegetation, and organisms. Cutting off and controlling the pollution source and preventing the spread of pollution are effective methods for dealing with sudden soil pollution.

[0003] Traditional compacted clay requires heavy equipment to compact; after the soil-geomembrane composite horizontal barrier is laid, the emergency disposal machinery and equipment have poor traffic capacity. Therefore, the existing technology is difficult to meet the emergency disposal needs of sudden environmental pollution incidents. The construction of fast-forming, high-toughness barrier materials through 3D printing technology can effectively overcome the disadvantages of traditional barrier materials. However, compared with the 3D printing technology in the field of traditional construction, the barrier of contaminated sites not only pays attention to the strength of the wall, but also pays more attention to the performance of the barrier in blocking pollutants. Compared with the vertical wall of the 3D printed building, the horizontal barrier is thin, but the number of horizontal strips is large, so there are a large number of splicing cold seams. The bonding strength of the cold seams between these printed strips is small, so it has little effect on the strength of the barrier. However, during the solidification of the material, dehydration cracking produces pores, cracks and other advantageous channels, which significantly reduces its ability to block pollutants. Therefore, how to avoid the generation of splicing cold seams and control the dehydration cracking of the barrier has become a technical problem in this field. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a 3D printing nozzle is provided for printing emergency horizontal barrier barriers for contaminated sites, which can simultaneously lay reinforcing nets and reinforcing wires on the top and sides of the printing tape during the printing process of the horizontal barrier strips to form a composite barrier, effectively control the cracking of the printed barrier, improve the barrier performance, and meet the emergency control needs of sudden environmental pollution.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] A 3D printing nozzle for printing an emergency horizontal barrier for a contaminated site, comprising a nozzle housing, a discharge molding port located at the bottom end of the nozzle housing, a reinforcing wire assembly and a reinforcing net assembly located outside the nozzle housing; the reinforcing wire assembly is connected to a side surface of the nozzle housing, and the reinforcing net assembly is connected to the front surface of the nozzle housing; when in operation, a printing tape constituting a horizontal barrier flows out of the discharge molding port, and the printing tape is made of a printing material, and the printing material is composed of aggregate and gel material.

[0007] As a preferred example, the reinforcement wire assembly includes a reinforcement wire storage unit, a reinforcement wire guide wheel group and a reinforcement wire fixture, the reinforcement wire storage unit and the reinforcement wire guide wheel group are respectively fixedly connected to one side of the nozzle shell, and the reinforcement wire guide wheel group is located below the reinforcement wire storage unit; the reinforcement wire fixture is fixedly connected to the discharge molding port through the reinforcement wire fixture bracket, and the reinforcement wire fixture is located below the reinforcement wire guide wheel group; the reinforcement wire fixture is used to store and pop out the reinforcement wire fixing rivets; the reinforcement wire storage unit includes a reinforcement wire storage box and a reinforcement wire reel, the reinforcement wire storage box is fixedly connected to one side of the nozzle shell, the reinforcement wire reel is fixedly connected in the inner cavity of the reinforcement wire storage box, and the reinforcement wire reel is used to wind the reinforcement wire.

[0008] As a preferred example, the reinforcement wire fixer includes a reinforcement wire fixer shell, a first pneumatic thruster installed on the outside of the reinforcement wire fixer shell, and a first fixed rivet supporter installed in the inner cavity of the reinforcement wire fixer shell; the front end bottom surface of the reinforcement wire fixer shell is provided with a rivet outlet, and the front end top surface of the reinforcement wire fixer shell is provided with an opening; the bottom end of the first pneumatic thruster is provided with a first ejector pin, the first ejector pin is opposite to the opening, and the opening is opposite to the rivet outlet; when in use, the reinforcement wire fixing rivet is located in the inner cavity of the reinforcement wire fixer shell, and the first fixed rivet supporter applies pressure to the reinforcement wire fixing rivet, so that the reinforcement wire fixing rivet has a tendency to move toward the front end of the reinforcement wire fixer shell; the height of the reinforcement wire fixing rivet is 1 / 2 to 4 / 5 of the thickness of a single printing tape, and the length of the reinforcement wire fixing rivet is 1 / 3 to 4 / 5 of the width of a single printing tape.

[0009] As a preferred example, the reinforcement line includes a strip body and an anti-slip line, the anti-slip line is perpendicular to the axis of the strip body, and the length of the anti-slip line is 3 to 6 times the maximum particle size of the aggregate in the printing material; there are N anti-slip lines, which are arranged in groups, and each group of anti-slip lines includes 4 to 8 anti-slip lines, and the anti-slip lines are evenly distributed along the axial direction of the strip body; the spacing between adjacent anti-slip lines is 1 / 4 to 2 / 3 of the width of the printing tape; in each group of anti-slip lines, the anti-slip lines are evenly distributed along the circumference of the strip body, the angles between adjacent anti-slip lines are equal, and the reinforcement line is three-dimensional.

[0010] As a preferred example, the reinforcing net assembly includes a reinforcing net storage unit, a reinforcing net guide wheel group and a reinforcing net fixture, the reinforcing net storage unit and the reinforcing net guide wheel group are respectively fixedly connected to the front side of the nozzle housing, and the reinforcing net guide wheel group is located below the reinforcing net storage unit; the reinforcing net fixture is fixedly connected to the discharge molding port through a reinforcing net fixture bracket, and the reinforcing net fixture is located below the reinforcing net guide wheel group; the reinforcing net fixture is used to store and pop out the reinforcing net fixing rivets; the reinforcing net storage unit includes a reinforcing net storage box and a reinforcing net reel, the reinforcing net storage box is fixedly connected to the front side of the nozzle housing, the reinforcing net reel is fixedly connected in the inner cavity of the reinforcing net storage box, and the reinforcing net reel is used to wind the reinforcing net.

[0011] As a preferred example, the reinforcement mesh is woven from reinforcement wires.

[0012] As a preferred example, the reinforcing mesh fixer includes a reinforcing mesh fixer shell, a second pneumatic thruster installed on the outside of the reinforcing mesh fixer shell, and a second fixed rivet supporter installed in the inner cavity of the reinforcing mesh fixer shell; the front end bottom surface of the reinforcing mesh fixer shell is provided with a rivet outlet, and the front end top surface of the reinforcing mesh fixer shell is provided with an opening; the bottom end of the second pneumatic thruster is provided with a second ejector pin, the second ejector pin is opposite to the opening, and the opening is opposite to the rivet outlet; when in use, the reinforcing mesh fixing rivet is located in the inner cavity of the reinforcing mesh fixer shell, and the second fixed rivet supporter applies pressure to the reinforcing mesh fixing rivet, so that the reinforcing mesh fixing rivet has a tendency to move toward the front end of the reinforcing mesh fixer shell; the height of the reinforcing mesh fixing rivet is 4 / 5 to 1 of the thickness of a single printing tape, and the length is 1 / 2 to 4 / 5 of the width of a single printing tape.

[0013] As a preferred example, the 3D printing nozzle further includes a volatile organic compound detector, which is fixedly connected to the outer wall of the nozzle housing, and is used to measure the concentration of volatile organic compounds in the soil surface atmosphere.

[0014] As a preferred example, the output pressure p1 of the first pneumatic thruster (10232) in the reinforcing wire fixture (1023) is calculated according to formula (1):

[0015] p1=a1-b1×f Formula (1)

[0016] In the formula, a1 represents the output pressure of the first pneumatic thruster corresponding to the destruction of the printing tape, and the value range of a1 is 1.5-2.0MPa; b1 represents the parameters related to the rivets for fixing the reinforcement line, and the value range of b1 is 0.003-0.004MPa / mm; f represents the fluidity of the barrier material, unit: mm.

[0017] As a preferred example, the output pressure p2 of the first pneumatic thruster in the reinforcing net fixture (1033) is calculated according to formula (2):

[0018] p2=a2-b2×fFormula (2)

[0019] Wherein, a2 represents the output pressure of the second pneumatic thruster corresponding to the destruction of the printing tape, and the value range of a2 is 1.5-2.0MPa; b2 represents the parameters related to the rivets for fixing the reinforcing mesh, and the value range of b2 is 0.003-0.004MPa / mm; f represents the fluidity of the barrier material, unit: mm.

[0020] Compared with the prior art, the 3D printing nozzle for printing emergency horizontal barrier for contaminated sites in the embodiment of the present invention can simultaneously lay out reinforcing nets and reinforcing wires on the top and sides of the printing tape during the printing process of the horizontal barrier strip, forming a composite barrier, effectively controlling the cracking of the printed barrier, improving the barrier performance, and meeting the emergency control needs of sudden environmental pollution. The printing nozzle includes a nozzle housing, a discharge molding port located at the bottom of the nozzle housing, a reinforcing wire assembly and a reinforcing net assembly located outside the nozzle housing; the reinforcing wire assembly is connected to one side of the nozzle housing, and the reinforcing net assembly is connected to the front of the nozzle housing; when working, the discharge molding port flows out a printing tape constituting a horizontal barrier, and the printing tape is made of printing material. The printing nozzle can simultaneously realize the laying of reinforcing wires between the same layer of printing tapes and the laying of reinforcing nets between layers of printing tapes during the printing process of the barrier. The reinforcing wire and reinforcing net effectively increase the bonding strength between the interface of the new and old printing tapes and reduce the formation of advantageous channels for the migration of pollutants; through the physical adsorption, chemical bonding and mechanical interlocking between the interface of the reinforcing wire and the printing slurry, a composite structure is formed, thereby reducing the development of voids and cracks during the hardening and dehydration process of the material. The reinforcing net can also effectively improve the flow state of the material after printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 (a) is a front view of an embodiment of the present invention;

[0022] Figure 1 (b) is a side view of an embodiment of the present invention;

[0023] Figure 2 (a) is a front view of a reinforcing wire storage unit according to an embodiment of the present invention;

[0024] Figure 2 (b) is a side view of the reinforcing wire storage unit according to an embodiment of the present invention;

[0025] Figure 3 (a) is a schematic diagram of the structure of a reinforcement line in an embodiment of the present invention;

[0026] Figure 3 (b) is a schematic cross-sectional view of a reinforcement line in an embodiment of the present invention;

[0027] Figure 4 (a) is a schematic diagram of the structure of another reinforcement line in an embodiment of the present invention;

[0028] Figure 4 (b) is a schematic cross-sectional view of another reinforcement line in an embodiment of the present invention;

[0029] Figure 5 is a schematic structural diagram of a reinforcing wire fixer in an embodiment of the present invention;

[0030] Figure 6 (a) is a side view of a reinforcement net storage unit in an embodiment of the present invention;

[0031] Figure 6 (b) is a front view of the reinforcing net storage unit in an embodiment of the present invention;

[0032] Figure 7 is a schematic structural diagram of a reinforcing net fixer in an embodiment of the present invention;

[0033] Figure 8 is a schematic diagram of the structure of a reinforcement net in an embodiment of the present invention;

[0034] Fig. 9 (a) is a front view of the structure of the print head when only the reinforcement line laying function is turned on in the embodiment of the present invention;

[0035] Fig. 9 (b) is a structural side view of the print head when only the reinforcement line laying function is turned on in the embodiment of the present invention;

[0036] Fig.10 (a) is a structural side view of the print head when only the reinforcement mesh laying function is turned on in the embodiment of the present invention;

[0037] Fig.10 (b) is a front view of the structure of the print head when only the reinforcement mesh laying function is turned on in the embodiment of the present invention;

[0038] Fig.11 This is a structural diagram of the print head when the reinforcement line and reinforcement net laying functions are enabled at the same time in the embodiment of the present invention;

[0039] Fig.12 (a) is a front view of a printed barrier according to an embodiment of the present invention;

[0040] Fig.12 (b) Fig.12 (a) Top view of section A-A';

[0041] Fig.12 (c) Fig.12 (a) Top view of section B-B';

[0042] Fig.13 (a) is a diagram showing the shape of the reinforcement line fixing rivet in an embodiment of the present invention;

[0043] Fig.13 (b) is a diagram showing the shape of the rivets used to fix the reinforcing mesh in an embodiment of the present invention.

[0044] The figure includes: a discharge molding port 1, a volatile organic compound detector 101, a reinforcing wire storage unit 1021, a reinforcing wire storage box 10211, a reinforcing wire reel 10212, a reinforcing wire 10213, a first cutter 10214, a strip body 102131, an anti-slip wire 102132, a reinforcing wire guide wheel assembly 1022, a reinforcing wire fixer 1023, a reinforcing wire fixing rivet 10231, a first pneumatic thruster 10232, a first ejector pin 102321, a first Fixed rivet support 10233, reinforcing wire fixer bracket 1024, reinforcing net storage unit 1031, reinforcing net storage box 10311, reinforcing net reel 10312, reinforcing net 10313, second tool 10314, reinforcing net guide wheel assembly 1032, reinforcing net fixer 1033, reinforcing net fixing rivet 10331, second pneumatic thruster 10332, second fixed rivet support 10333, reinforcing net fixer bracket 1034, printing tape 2. DETAILED DESCRIPTION

[0045] The technical solution of the present invention is described in detail below. The experimental methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0046] like Figure 1 (a) and Figure 1 As shown in (b), a 3D printing nozzle for printing an emergency horizontal barrier for a contaminated site according to an embodiment of the present invention comprises a nozzle housing, a discharge molding port 1 located at the bottom of the nozzle housing, and a reinforcing wire assembly and a reinforcing mesh assembly located outside the nozzle housing. The reinforcing wire assembly is connected to one side of the nozzle housing. The reinforcing mesh assembly is connected to the front of the nozzle housing. The discharge molding port 1 flows out a printing tape 2 constituting a horizontal barrier, and the printing tape 2 is made of a printing material, and the printing material is composed of aggregate and gel material.

[0047] The 3D printing nozzle of the above embodiment discharges the printing tape 2 through the discharge molding port 1. The printing tape 2 is in the shape of a strip, and has a top surface, a bottom surface, and four side surfaces: front, rear, left, and right. The front length of the printing tape 2 is greater than the left length. The front length of the printing tape 2 is equal to the rear length. The left length of the printing tape 2 is equal to the right length. The reinforcing wire assembly is connected to one side of the nozzle housing. When working, as Fig. 9 (a) and Fig. 9 As shown in (b), while the printing tape 2 flows out of the material outlet 1, the reinforcing wire assembly outputs the reinforcing wire, which is located on the side of the printing tape 2 and is at least partially embedded in the printing tape 2. The reinforcing wire is connected to the printing tape 2. Fig.10 (a) and Fig.10 As shown in (b), the reinforcing net assembly is connected to the front of the nozzle housing. When the printing tape 2 flows out from the discharge molding port 1, the printing tape 2 gradually becomes horizontal, and the surface of the nozzle housing opposite to the top surface of the printing tape 2 is the front of the nozzle housing. When working, while the printing tape 2 flows out of the discharge molding port 1, the reinforcing net assembly outputs the reinforcing net, which is located on the top surface of the printing tape 2 and is at least partially embedded in the printing tape 2. The reinforcing net is connected to the printing tape 2. As shown in FIG. Fig.11 As shown, when working, while the printing tape 2 flows out of the material forming port 1, the reinforcing wire is connected to the side of the printing tape 2, and the reinforcing net is connected to the top surface of the printing tape 2. Fig.12 (a) Fig.12 (b) and Fig.12 As shown in (c), the reinforcing net 10313 is connected to the top surface of the printing tape 2 through the reinforcing net fixing rivet 10331; the reinforcing wire 10213 is connected to one side of the printing tape 2 through the reinforcing wire fixing rivet 10231. In this way, the reinforcing wire is set on one side of the printing tape 2. Through the adsorption effect of the reinforcing wire 10213 and the printing material, the deposition of the printing slurry between the interface of the new printing tape and the interface of the old printing tape is promoted, and the vacant area formed by the air wrapped between the interface of the new and old printing tapes is reduced, thereby effectively increasing the bonding strength between the interface of the new and old printing tapes and reducing the formation of the advantageous channel for the migration of pollutants. The new printing tape and the old printing tape are two adjacent printing tapes, and the old printing tape is printed before the new printing tape. In addition, under the synergistic effect of the reinforcement line 10213 and its anti-slip line, the printing slurry at the contact interface of two adjacent printing belts forms a composite structure through the physical adsorption, chemical bonding and mechanical interlocking between the interface of the reinforcement line 10213 and the printing slurry. The effect of the anti-slip line and the slurry significantly improves the density of the transition zone of the interface between the two adjacent printing belts, thereby reducing the development of voids and the formation of cracks during the hardening and water loss process of the material.

[0048] After the reinforcing net is set on the top surface of the printing belt 2, in addition to having the same effect as the reinforcing line 10213 in improving the cohesion of the interface between adjacent printing belts, reducing the empty area, and increasing the strength and barrier performance of the barrier, it can also effectively improve the flow state of the material after printing. Especially for the situation where the ground of the site is undulating (slope greater than 30°), the change in slope will cause significant changes in the thickness of each layer of the printing barrier at different positions, thereby causing the barrier performance of the barrier as a whole to decrease and the weak points for organic matter to penetrate to increase. By directly setting the reinforcing net on two adjacent printing belts, the lateral flow of the printed material under the action of gravity after printing is effectively suppressed, making the thickness of the barrier more uniform.

[0049] Preferably, Figure 2 (a) and Figure 2 As shown in (b), the reinforcing wire assembly includes a reinforcing wire storage unit 1021, a reinforcing wire guide wheel group 1022 and a reinforcing wire fixture 1023. The reinforcing wire storage unit 1021 and the reinforcing wire guide wheel group 1022 are respectively fixedly connected to one side of the nozzle housing, and the reinforcing wire guide wheel group 1022 is located below the reinforcing wire storage unit 1021. The reinforcing wire fixture 1023 is fixedly connected to the discharge molding port 1 through the reinforcing wire fixture bracket 1024, and the reinforcing wire fixture 1023 is located below the reinforcing wire guide wheel group 1022. The reinforcing wire fixture 1023 is used to store and eject the reinforcing wire fixing rivet 10231. The reinforcing wire storage unit 1021 includes a reinforcing wire storage box 10211 and a reinforcing wire reel 10212. The reinforcing wire storage box 10211 is fixedly connected to one side of the nozzle housing. The reinforcing wire reel 10212 is fixedly connected to the inner cavity of the reinforcing wire storage box 10211. The reinforcing wire reel 10212 is used to wind the reinforcing wire 10213. Fig.13 As shown in (a), the reinforcement line fixing rivet 10231 is in the shape of a U-shaped with one end open.

[0050] In the above preferred example, the reinforcing wire 10213 is wound on the reinforcing wire reel 10212. An opening is provided on the reinforcing wire storage box 10211, and the reinforcing wire 10213 can pass through the opening and move out of the reinforcing wire storage box 10211. During operation, the reinforcing wire guide wheel group 1022 is started, and the reinforcing wire guide wheel group 1022 drives the reinforcing wire to move out from the reinforcing wire storage unit 1021. When the reinforcing wire moves to the discharge molding port 1, the reinforcing wire fixer 1023 shoots out the reinforcing wire fixing rivet 10231. The reinforcing wire fixing rivet 10231 fixes the reinforcing wire on one side of the printing belt 2. The reinforcing wire guide wheel group 1022 includes at least two reinforcing wire guide wheels, which are not coaxially arranged. The reinforcing wire moves from above the reinforcing wire guide wheel located upstream and moves from below the reinforcing wire guide wheel located downstream. Through the action of the reinforcing wire guide wheel located downstream, the reinforcing wire is close to the side of the printing belt 2.

[0051] Preferably, a first cutter 10214 is provided below the opening of the reinforcement line storage unit 1021, and the first cutter 10214 is connected to a side surface of the nozzle housing. When it is not necessary to set a reinforcement line on the side surface of the printing tape 2, or after setting a reinforcement line on the side surface of a printing tape 2, the first cutter 10214 is used to cut the reinforcement line.

[0052] Preferably, Figure 5 As shown, the reinforcing wire fixer 1023 includes a reinforcing wire fixer shell, a first pneumatic thruster 10232 installed on the outside of the reinforcing wire fixer shell, and a first fixed rivet supporter 10233 installed in the inner cavity of the reinforcing wire fixer shell; the front end bottom surface of the reinforcing wire fixer shell is provided with a rivet outlet, and the front end top surface of the reinforcing wire fixer shell is provided with an opening; the bottom end of the first pneumatic thruster 10232 is provided with a first ejector pin 102321, the first ejector pin 102321 is opposite to the opening, and the opening is opposite to the rivet outlet; when in use, the reinforcing wire fixing rivet 10231 is located in the inner cavity of the reinforcing wire fixer shell, and the first fixed rivet supporter 10233 applies pressure to the reinforcing wire fixing rivet 10231, so that the reinforcing wire fixing rivet 10231 has a tendency to move toward the front end of the reinforcing wire fixer shell. The height H1 of the reinforcement line fixing rivet 10231 is 1 / 2 to 4 / 5 of the thickness of a single printing tape 2 , and the length L1 of the reinforcement line fixing rivet 10231 is 1 / 3 to 4 / 5 of the width of a single printing tape 2 .

[0053] In the reinforcing wire fixer 1023 of the above embodiment, in the inner cavity of the reinforcing wire fixer housing, the first fixing rivet supporter 10233 applies pressure to the reinforcing wire fixing rivet 10231, so that the reinforcing wire fixing rivet 10231 has a tendency to move toward the front end of the reinforcing wire fixer housing. The first pneumatic thruster 10232 is connected to the pressure pump. Under the action of the pressure pump, the first pneumatic thruster 10232 reciprocates, thereby driving the first ejector pin 102321 to reciprocate up and down. Each time it moves, the first ejector pin 102321 can push down a reinforcing wire fixing rivet 10231 that is closest to the front end of the reinforcing wire fixer 1023. Under the inertia of the reinforcing wire fixing rivet 10231 after being pushed out, the reinforcing wire fixing rivet 10231 rushes toward the reinforcing wire and fixes the reinforcing wire to the side of the printing tape 2. By adjusting the output pressure of the first pneumatic thruster 10232, the thrust of the first ejector pin 102321 can be adjusted, thereby optimizing the energy carried by the reinforcing wire fixing rivet 10231 after being pushed out.

[0054] Preferably, Figure 3 (a) and Figure 3As shown in (b), the reinforcing line 10213 includes a strip body 102131 and an anti-skid line 102132. The anti-skid line 102132 is perpendicular to the axis of the strip body 102131, and the length of the anti-skid line 102132 is 3 to 6 times the maximum particle size of the aggregate in the printed material. Usually, the printed material is composed of aggregate and gel material. By reasonably setting the length of the anti-skid line 102132 on the reinforcing line 10213, the mechanical interlocking effect between the anti-skid line 102132 and the aggregate in the barrier can be adjusted to increase the mechanical properties of the composite structure. The stress borne on the reinforcing line 10213 is transferred to the hardened slurry through the anti-skid line 102132, reducing the number and size of cracks and internal microcracks in the barrier, and improving the continuity of the barrier. During the stress process, the anti-skid line 102132 and the reinforcing line 10213 change the stress field of the hardened slurry, and the expansion of cracks is prevented or delayed by the bridging effect of the anti-skid line 102132, thereby improving the toughness of the barrier under the external load during the emergency treatment process. If the length of the anti-skid line 102132 is too long, agglomerates will be formed and cavities will be generated in the barrier; if the length of the anti-skid line 102132 is too short, effective friction cannot be formed, and the mechanical interlocking effect is not obvious.

[0055] There are N anti-skid lines 102132, which are arranged in groups. Each group of anti-skid lines 102132 includes 4 to 8 anti-skid lines, and the anti-skid lines 102132 are evenly distributed along the axial direction of the strip body 102131. The spacing between adjacent anti-skid lines 102132 is 1 / 4 to 2 / 3 of the width of the printing tape 2. This can effectively adjust the friction between the anti-skid lines 102132 in the barrier and the aggregate in the printing slurry under the action of external loads, prevent or delay the expansion of cracks, and improve the mechanical and pollution barrier properties of the barrier.

[0056] In each set of anti-skid lines, the anti-skid lines 102132 are evenly distributed along the circumference of the strip body 102131, the angles between adjacent anti-skid lines 102132 are equal, and the reinforcement lines are three-dimensional. This can ensure that the anti-skid lines 102132 are evenly distributed in two adjacent printing strips, and effectively prevent the anti-skid lines 102132 from just adhering to the middle of two adjacent printing strips without being embedded in the printing material.

[0057] like Figure 4 (a) and Figure 4 As shown in (b), the strip body 102131 is straight. This prevents the strip body 102131 from being stacked between two adjacent printing strips 2, thereby forming a favorable channel for the migration of pollutants such as holes and cavities; through the straight strip body 102131, under the action of slight tension, prestress is generated, and tensile stress is generated during the hardening and forming process of the barrier, thereby improving the mechanical properties of the barrier; in addition, the use amount of the strip body 102131 can be reduced.

[0058] In each set of anti-skid lines, the connection points between the anti-skid lines 102132 and the strip body 102131 are located at different positions in the anti-skid lines 102132. A three-dimensional anchor body is formed at the interface position of two adjacent printing strips 2, which enhances the mechanical interlocking effect between the interface of the strip body 102131 and the anti-skid lines 102132 and the printing slurry, thereby improving the service performance of the barrier. The strip body 102131 and the anti-skid lines 102132 work together. The anti-slip line 102132 can enhance the bonding strength and interface area between the reinforcement line and the printing paste. Under the synergistic action of the strip body 102131 and the anti-slip line 102132, the printing paste at the contact interface of two adjacent printing tapes forms a composite structure through the physical adsorption, chemical bonding and mechanical interlocking between the interface between the strip body 102131 and the anti-slip line 102132 and the printing paste, thereby increasing the internal stress of the barrier barrier caused by water loss and cracking during maintenance, the mechanical strength under external loads during service, and the pollution barrier performance.

[0059] Preferably, Figure 6 (a) and Figure 6 As shown in (b), the reinforcing net assembly includes a reinforcing net storage unit 1031, a reinforcing net guide wheel group 1032 and a reinforcing net fixer 1033. The reinforcing net storage unit 1031 and the reinforcing net guide wheel group 1032 are respectively fixedly connected to the front of the nozzle housing, and the reinforcing net guide wheel group 1032 is located below the reinforcing net storage unit 1031. The reinforcing net fixer 1033 is fixedly connected to the discharge molding port 1 through the reinforcing net fixer bracket 1034, and the reinforcing net fixer 1033 is located below the reinforcing net guide wheel group 1032. The reinforcing net fixer 1033 is used to store and eject the reinforcing net fixing rivets 10331. The reinforcing net storage unit 1031 includes a reinforcing net storage box 10311 and a reinforcing net reel 10312. The reinforcing net storage box 10311 is fixedly connected to the front of the nozzle housing, and the reinforcing net reel 10312 is fixedly connected to the inner cavity of the reinforcing net storage box 10311. The reinforcing net reel 10312 is used to wind the reinforcing net 10313. Fig.13 As shown in (b), the reinforcing mesh fixing rivet 10331 is in the shape of a U-shaped with an open bottom.

[0060] In the above preferred example, the reinforcing net 10313 is wound on the reinforcing net reel 10312. An opening is provided on the reinforcing net storage box 10311, and the reinforcing net 10313 can be moved out of the reinforcing net storage box 10311 through the opening. During operation, the reinforcing net guide wheel group 1032 is started, and the reinforcing net guide wheel group 1032 drives the reinforcing net to move out of the reinforcing net storage box 10311. When the reinforcing net moves to the discharge molding port 1, the reinforcing net fixer 1033 ejects the reinforcing net fixing rivet 10331. The reinforcing net fixing rivet 10331 fixes the reinforcing net on the top surface of the printing belt 2. The reinforcing net guide wheel group 1032 includes at least two reinforcing net guide wheels, which are not arranged on the same axis. The reinforcing net moves from above the reinforcing net guide wheel located upstream and from below the reinforcing net guide wheel located downstream. Through the action of the reinforcing net guide wheel located downstream, the reinforcing net is close to the top surface of the printing belt 2.

[0061] Preferably, a second cutter 10314 is provided below the opening of the reinforcing net storage box 10311, and the second cutter 10314 is connected to the nozzle housing. When it is not necessary to set a reinforcing net on the front of the printing tape 2, or after the reinforcing net is set on the top surface of a printing tape 2, the second cutter 10314 is used to cut the reinforcing net.

[0062] like Figure 8 As shown, the reinforcing mesh 10313 is woven from reinforcing wires. The mesh holes in the reinforcing mesh 10313 are square. Since the reinforcing wires are provided with anti-skid wires and are three-dimensional, the reinforcing mesh 10313 is also three-dimensional. This can ensure that the anti-skid wires on the reinforcing mesh 10313 are evenly distributed in the printing slurry of two adjacent printing layers, effectively avoiding the anti-skid wires only adhering to the middle of the two adjacent printing layers, but not being embedded in the printing material, so that the reinforcing mesh fails to reflect the optimal reinforcement effect on the service performance of the barrier.

[0063] Preferably, Figure 7As shown, the reinforcing mesh fixer 1033 and the reinforcing wire fixer 1023 have the same structure. The reinforcing mesh fixer 1033 includes a reinforcing mesh fixer housing, a second pneumatic thruster 10332 installed outside the reinforcing mesh fixer housing, and a second fixed rivet supporter 10333 installed in the inner cavity of the reinforcing mesh fixer housing; the front bottom surface of the reinforcing mesh fixer housing is provided with a rivet outlet, and the front top surface of the reinforcing mesh fixer housing is provided with an opening; the bottom end of the second pneumatic thruster 10332 is provided with a second ejector pin, the second ejector pin is opposite to the opening, and the opening is opposite to the rivet outlet. When in use, the reinforcing mesh fixing rivet 10331 is located in the inner cavity of the reinforcing mesh fixer housing, and the second fixed rivet supporter 10333 applies pressure to the reinforcing mesh fixing rivet 10331, so that the reinforcing mesh fixing rivet 10331 has a tendency to move toward the front end of the reinforcing mesh fixer housing. The reinforcing mesh fixing rivet 10331 and the reinforcing wire fixing rivet 10231 have the same structure but different sizes. The height H2 of the reinforcing mesh fixing rivet 10331 is 4 / 5 to 1 of the thickness of a single printing tape 2, and the length L2 of the reinforcing mesh fixing rivet 10331 is 1 / 2 to 4 / 5 of the width of a single printing tape 2. In this way, when the reinforcing mesh fixing rivet 10331 and the reinforcing wire fixing rivet 10231 do not penetrate the single printing tape 2, the reinforcing mesh and the reinforcing wire are effectively fixed.

[0064] In the reinforcing mesh fixer 1033 of the above embodiment, in the inner cavity of the reinforcing mesh fixer housing, the first fixing rivet supporter 10233 applies pressure to the reinforcing mesh fixing rivet 10331, so that the reinforcing mesh fixing rivet 10331 has a tendency to move toward the front end of the reinforcing mesh fixer housing. The first pneumatic thruster 10232 is connected to the pressure pump. Under the action of the pressure pump, the first pneumatic thruster 10232 reciprocates, thereby driving the first ejector pin 102321 to reciprocate up and down. Each time it moves, the first ejector pin 102321 can push down a reinforcing mesh fixing rivet 10331 that is closest to the front end of the reinforcing mesh fixer 1033. Under the inertia of the reinforcing mesh fixing rivet 10331 after being pushed out, the reinforcing mesh fixing rivet 10331 rushes toward the reinforcing mesh and fixes the reinforcing mesh on the top surface of the printing tape 2. By adjusting the output pressure of the first pneumatic thruster 10232, the thrust of the first ejector pin 102321 can be adjusted, thereby optimizing the energy carried by the reinforcing mesh fixing rivet after being pushed out.

[0065] Preferably, Figure 1As shown in (a), the 3D printing nozzle also includes a volatile organic compound detector 101. The volatile organic compound detector 101 is fixedly connected to the outer wall of the nozzle shell, and the volatile organic compound detector 101 is used to measure the concentration of volatile organic compounds in the atmosphere of the soil surface. Usually, after the barrier is printed, the concentration of volatile organic compounds in the atmosphere of the covered area will be significantly reduced. However, due to the low bearing capacity of the original stratum and the presence of vegetation, the barrier will collapse after printing and before hardening, causing the barrier to be damaged, so the barrier effect on volatile organic compounds disappears. In order to avoid this situation, after each barrier is printed, the concentration of volatile organic compounds in the atmosphere of the soil surface is measured with a volatile organic compound detector 101 to check whether there is a damaged area in the barrier. If there is a damaged area, a second printing construction is performed.

[0066] Preferably, the output pressure p1 of the first pneumatic thruster 10232 in the reinforcing wire fixture 1023 is calculated according to formula (1):

[0067] p1=a1-b1×f Formula (1)

[0068] In the formula, a1 represents the output pressure of the first pneumatic thruster corresponding to the destruction of the printing tape, and the value range of a1 is 1.5-2.0MPa; b1 represents the parameters related to the rivets for fixing the reinforcement line, and the value range of b1 is 0.003-0.004MPa / mm; f represents the fluidity of the barrier material, unit: mm.

[0069] The output pressure p2 of the first pneumatic thruster in the reinforcing net fixture 1033 is calculated according to formula (2):

[0070] p2=a2-b2×fFormula (2)

[0071] Where a2 represents the output pressure of the second pneumatic thruster corresponding to the destruction of the printing tape, and the value range of a2 is 1.5-2.0-MPa; b2 represents the parameters related to the rivets for fixing the reinforcing mesh, and the value range of b2 is 0.003-0.004 MPa / mm; f represents the fluidity of the barrier material, unit: mm.

[0072] Compare the samples in the area near the cold seam of the 3D printed barrier and the barrier effects before and after setting the reinforcement wire and reinforcement net.

[0073] The thickness of sample 1 is 2 layers, with a reinforcement net set between the two layers, and each layer is provided with 2 printing tapes, and reinforcement lines are set between the printing tapes. The width of the printing tape is 30cm, the length is 10m, and the thickness is 10cm. Every 10 meters of reinforcement line 2 is provided with 125 groups of anti-slip lines, each group of anti-slip lines includes 4 anti-slip lines, and the length of each anti-slip line is 1cm (5 times the maximum particle size of 2mm of aggregate in the printing material). The grid side length of the reinforcement net is 9cm (0.3 times the width of the printing tape). A sampling hole is set between two adjacent printing tapes on the same layer, and the sampling hole runs through the upper and lower layers for sampling. The first sample obtained by sampling is a cylindrical sample with a diameter of 20cm and a height of 20cm.

[0074] Sample 2 is the same as Sample 1, but no reinforcing mesh is provided between the two layers, and no reinforcing wire is provided between the printing strips. Sampling is performed at the same sampling position as Sample 1 to obtain a second sample of the same size.

[0075] The permeability coefficient of the cold joint area of ​​the barrier of the above two samples was tested with reference to the "Test Code for Cement and Cement Concrete for Highway Engineering" (JTG 3420-2020). The test results are: the permeability coefficient of the first sample is 2.71×10 - 7 cm / s, and the permeability coefficient of the second sample is 6.05×10 -6 cm / s. Therefore, after setting the reinforcement wire and reinforcement net, the pollution barrier performance of the cold seam area of ​​the 3D printed barrier is significantly improved, and the permeability coefficient is reduced by more than one order of magnitude.

[0076] The present invention effectively controls the migration of pollutants or blocks the exposure pathway of pollutants through the toughening effect of the reinforcing wires made of fibers arranged between the printing strips and the toughening effect of the reinforcing nets made of fibers arranged between the printing layers, thereby achieving efficient emergency disposal of sudden soil environmental pollution incidents.

[0077] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments, and the descriptions in the above specific embodiments and the specification are only for further illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed for protection.

Claims

1. A 3D printing nozzle for printing emergency horizontal barrier for contaminated sites, characterized in that: The invention comprises a nozzle housing, a discharge molding port (1) located at the bottom end of the nozzle housing, and a reinforcing wire assembly and a reinforcing net assembly located outside the nozzle housing; the reinforcing wire assembly is connected to a side surface of the nozzle housing, and the reinforcing net assembly is connected to the front surface of the nozzle housing; when in operation, the discharge molding port (1) flows out a printing tape (2) constituting a horizontal barrier, and during the printing process of the horizontal barrier strip, a reinforcing net and a reinforcing wire are simultaneously arranged on the top and side of the printing tape to form a composite barrier; the printing tape (2) is made of a printing material, and the printing material is composed of aggregate and gel material; The reinforcing wire assembly comprises a reinforcing wire storage unit (1021), a reinforcing wire guide wheel group (1022) and a reinforcing wire fixer (1023); the reinforcing wire storage unit (1021) and the reinforcing wire guide wheel group (1022) are respectively fixedly connected to a side surface of the nozzle housing, and the reinforcing wire guide wheel group (1022) is located below the reinforcing wire storage unit (1021); the reinforcing wire fixer (1023) is fixedly connected to the discharge molding port (1) via a reinforcing wire fixer bracket (1024), and the reinforcing wire fixer (1023) is located below the reinforcing wire guide wheel group (1022); the reinforcing wire fixer (1023) is used to store and eject the reinforcing wire fixing rivets (10231); The reinforcing wire storage unit (1021) comprises a reinforcing wire storage box (10211) and a reinforcing wire reel (10212); the reinforcing wire storage box (10211) is fixedly connected to a side surface of the nozzle housing; the reinforcing wire reel (10212) is fixedly connected to the inner cavity of the reinforcing wire storage box (10211); the reinforcing wire reel (10212) is used to wind the reinforcing wire (10213); The reinforcing wire fixer (1023) comprises a reinforcing wire fixer housing, a first pneumatic thruster (10232) installed outside the reinforcing wire fixer housing, and a first fixed rivet supporter (10233) installed in the inner cavity of the reinforcing wire fixer housing; the front end bottom surface of the reinforcing wire fixer housing is provided with a rivet outlet, and the front end top surface of the reinforcing wire fixer housing is provided with an opening; the bottom end of the first pneumatic thruster (10232) is provided with a first ejector pin (102321), the first ejector pin (102321) is opposite to the opening, and the opening is opposite to the rivet outlet; when in use, the reinforcing wire fixed rivet (10231) is located in the inner cavity of the reinforcing wire fixer housing, and the first fixed rivet supporter (10233) applies pressure to the reinforcing wire fixed rivet (10231), so that the reinforcing wire fixed rivet (10231) has a tendency to move toward the front end of the reinforcing wire fixer housing; The height of the reinforcement line fixing rivet (10231) is 1 / 2 to 4 / 5 of the thickness of a single printing tape (2), and the length of the reinforcement line fixing rivet (10231) is 1 / 3 to 4 / 5 of the width of a single printing tape (2).

2. The 3D printing nozzle according to claim 1, characterized in that: The reinforcement line (10213) comprises a strip-shaped body (102131) and an anti-slip line (102132), wherein the anti-slip line (102132) is perpendicular to the axis of the strip-shaped body (102131), and the length of the anti-slip line (102132) is 3 to 6 times the maximum particle size of the aggregate in the printing material; There are N anti-slip lines (102132) arranged in groups, each group of anti-slip lines includes 4 to 8 anti-slip lines (102132), and the anti-slip lines (102132) are evenly distributed along the axial direction of the strip body (102131); the spacing between adjacent anti-slip lines (102132) is 1 / 4 to 2 / 3 of the width of the printing tape (2); In each group of anti-skid lines, the anti-skid lines (102132) are evenly distributed along the circumference of the strip-shaped body (102131), the angles between adjacent anti-skid lines (102132) are equal, and the reinforcement lines are three-dimensional.

3. The 3D printing nozzle according to claim 2, characterized in that: The reinforcing net assembly comprises a reinforcing net storage unit (1031), a reinforcing net guide wheel group (1032) and a reinforcing net fixer (1033); the reinforcing net storage unit (1031) and the reinforcing net guide wheel group (1032) are respectively fixedly connected to the front side of the nozzle housing, and the reinforcing net guide wheel group (1032) is located below the reinforcing net storage unit (1031); the reinforcing net fixer (1033) is fixedly connected to the discharge molding port (1) via a reinforcing net fixer bracket (1034), and the reinforcing net fixer (1033) is located below the reinforcing net guide wheel group (1032); the reinforcing net fixer (1033) is used to store and eject the reinforcing net fixing rivets (10331); The reinforcing net storage unit (1031) comprises a reinforcing net storage box (10311) and a reinforcing net reel (10312); the reinforcing net storage box (10311) is fixedly connected to the front of the nozzle housing; the reinforcing net reel (10312) is fixedly connected to the inner cavity of the reinforcing net storage box (10311); and the reinforcing net reel (10312) is used to wind up the reinforcing net (10313).

4. The 3D printing nozzle according to claim 3, characterized in that: The reinforcing mesh (10313) is woven from reinforcing wires.

5. The 3D printing nozzle according to claim 3, characterized in that: The reinforcing mesh fixer (1033) comprises a reinforcing mesh fixer shell, a second pneumatic thruster (10332) installed outside the reinforcing mesh fixer shell, and a second fixed rivet supporter (10333) installed in the inner cavity of the reinforcing mesh fixer shell; the front end bottom surface of the reinforcing mesh fixer shell is provided with a rivet outlet, and the front end top surface of the reinforcing mesh fixer shell is provided with an opening; the bottom end of the second pneumatic thruster (10332) is provided with a second ejector pin, the second ejector pin is opposite to the opening, and the opening is opposite to the rivet outlet; when in use, the reinforcing mesh fixing rivet is located in the inner cavity of the reinforcing mesh fixer shell, and the second fixed rivet supporter (10333) applies pressure to the reinforcing mesh fixing rivet, so that the reinforcing mesh fixing rivet has a tendency to move toward the front end of the reinforcing mesh fixer shell; The height of the reinforcing mesh fixing rivet (10331) is 4 / 5 to 1 of the thickness of a single printing tape (2), and the length of the reinforcing mesh fixing rivet (10331) is 1 / 2 to 4 / 5 of the width of a single printing tape (2).

6. The 3D printing nozzle according to claim 1, characterized in that: It also comprises a volatile organic matter detector (101), wherein the volatile organic matter detector (101) is fixedly connected to the outer wall of the nozzle housing, and the volatile organic matter detector (101) is used to measure the concentration of volatile organic matter in the atmosphere of the soil surface layer.

7. The 3D printing nozzle according to claim 1, characterized in that: The first pneumatic thruster (10232) in the reinforcing wire fixture (1023) outputs a pressure p 1 , calculated according to formula (1): Formula (1) In the formula, a 1 represents the output pressure of the first pneumatic thruster corresponding to the time when the printing tape is damaged. a 1The value range is 1.5~2.0MPa; b 1 represents the parameters related to the reinforcement line fixing rivets, b 1The value range is 0.003~0.004MPa / mm; f Indicates the fluidity of the barrier material, unit: mm.

8. The 3D printing nozzle according to claim 5, characterized in that: The output pressure of the second pneumatic thruster in the reinforcing net fixer (1033) p 2. Calculate according to formula (2): Formula (2) In the formula, a 2 represents the output pressure of the second pneumatic thruster corresponding to the damage of the printing tape. a 2The value range is 1.5~2.0MPa; b 2 represents the parameters related to the rivets for fixing the reinforcement mesh. b 2The value range is 0.003~0.004MPa / mm; f Indicates the fluidity of the barrier material, unit: mm.

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