Shield construction simulation device for high-viscosity layer based on a foam agent

Abstract

Shield construction simulation device for a high-viscosity layer based on a foaming agent, characterized in that the device comprises a foaming agent preparation unit (1), a slag soil improvement tank (2), a simulated cutting head unit (3), and a slag discharge unit (4); wherein the foaming agent preparation unit (1) is connected to the slag soil improvement tank (2) via a liquid supply line (5); the simulated cutting head unit (3) is arranged at the bottom of the slag soil improvement tank (2); and the slag discharge unit (4) is arranged at an outlet of the simulated cutting head unit (3).

Description

Technical FieldThe invention relates to the technical field of schict sign construction simulation and relates in particular to a sign construction simulation device for a highly viscous layer based on a foaming agent.Prior ArtShield construction technology is widely used as an important means of developing urban underground rooms in the construction of urban subway, drainage systems, underground piping and other infrastructures because it only slightly affects urban traffic and environment. However, in the case of shield construction in high viscosity sedimentary brick material there are still many technical challenges which considerably impair the construction speed and construction safety. The high viscosity sediment brick layer has strong cohesion and low permeability, which makes disposal of the slag bottom considerably more difficult. In such formations, the high viscosity slag bottom tends to stick to the cutting head of the shield machine, which complicates disposal of the slag and increases build resistance. Moreover, after the mixing of the bottom and water, a sludge cake frequently arises, which not only reinforces the adhesion of the slag bottom, but can also cause a series of safety problems such as the blockage of the slag discharge system or the blockage of the shield machine and so forth. Due to the difficult ground conveyance in highly viscous layers, higher shear forces and higher energy consumption are often required during construction, which further increases the construction costs and risks. Therefore, the problem to be solved is urgent, as can be simulated effectively by laboratory tests of the mining process in the high viscosity sedimentary brick layer material in order to improve the efficiency and safety of mining.By reducing the surface tension of water and mixing with air to produce a large number of stable foam, the foaming agent can significantly reduce the internal friction angle and adhesion of the slag floor, thereby significantly improving the flowability of the slag floor, reducing the torque and working pressure at the cutting head of the shield machine, and improving the efficiency of the shield operation. The foam lubrication can also effectively reduce the permeability of the slag bottom, prevent the phenomenon of "water leakage", and thus reduce the disturbances of the shield machine. Moreover, the foam may also form a buffer layer in the bottom container, improve compressibility of the slag bottom, support stability of the mining front, reduce pressure fluctuations at the working surface, contribute to regulating the bottom pressure, and ensure smooth propulsion of the shield machine. Although the use of foaming agents in shield construction in the high-viscosity layer has been confirmed theoretically and experimentally, there is still no testing device which can accurately simulate the entire shield construction process in the high-viscosity layer. Existing test equipment can only simulate the function of the foaming agent or local construction environments. Therefore, it is difficult to evaluate the actual performance of foaming agents under various geological conditions. Therefore, there is an urgent need for a signboard simulation apparatus for a high viscosity layer that integrates the use of foaming agent, signboard machine propulsion, slag bottom flowability, and other multifactors to provide a more accurate test basis and technical support for signboard construction in a high viscosity layer.Summary of the Utility ModelIn view of the deficiencies existing in the prior art, the utility model provides a shield simulation apparatus for a highly viscous layer based on a foaming agent, and solves the problem that existing shield simulation test devices cannot simulate the propulsion in the highly viscous layer under the promoting action of a foaming agent.To achieve the above object, the utility model uses the following technical solution.A foaming agent-based high viscosity layer sign construction simulating apparatus includes a foaming agent preparing unit, a slag soil improving tank, a simulated cutting head unit, and a slag discharge unit; the foaming agent preparing unit is connected to the slag soil improving tank via a liquid supply line; the simulated cutting head unit is disposed at the bottom of the slag soil improving tank; and the slag discharge unit is disposed at an outlet of the simulated cutting head unit.In this solution, the foaming agent preparation unit generates the foaming agent and transfers the foaming agent to the slag bottom improving tank via the liquid supply pipe. The foaming agent and the slag floor improve the mixing of the slag floor in the tank, whereby the internal friction angle and the adhesion of the slag floor are reduced, the flowability is improved and thus the slag floor is modified. The simulated cutting head unit is used to dug the slag floor and simulate the shield process. The excavation of the slag floor is achieved by the cooperation of the foaming agent, which offers the experimental basis and technical support for the use of a foaming agent in the shield construction of a highly viscous layer.Furthermore, the foaming agent preparation unit comprises a gas supply system and a foaming device, wherein the gas supply system is connected to the liquid supply line via a gas line; the foaming device is connected to the liquid supply line via a foaming line.In this solution, a gas supply system generates a gas, a foaming device generates a foaming agent, the gas and the foaming agent are mixed in the liquid supply pipe, and the gas carries the foaming agent to the slag bottom improving tank.Further, the slag bottom improving tank includes a slag bottom tank, and the liquid supply pipe is connected to a side wall of the slag bottom tank; a stirrer having a stirring shaft penetrating inside the slag bottom tank and connected to a stirring slurry is disposed on the top of the slag bottom tank; and a slag bottom transfer pipe is connected to the bottom of the slag bottom tank.In this solution, the agitator is started, the agitator drives the agitating slurry to rotate, the slag floor and the foaming agent are agitated during the rotation, and the two substances are completely put into communication and mixed, so that the foaming agent can effectively improve the slag floor.Further, the simulated cutting head unit includes a disk case body, wherein the top of the disk case body is provided with an opening connected to the bottom of the slag bottom transfer line; a drive shaft is disposed inside the disk case body; a plurality of blades are disposed around the drive shaft; an end portion of the drive shaft comes out of a side wall of the disk case body and is transmission-connected to a drive motor via a first timing belt unit; and a slag bottom discharge duct is disposed at the bottom of the disk case body.In this solution, the drive motor may drive the rotation of the drive shaft, and the blade on the drive shaft follows the rotation of the drive shaft. The slag floor flowing out of the slag floor transfer line is cut by the rotation to simulate the shield advancement process. The excavated slag floor is discharged through the slag floor discharge channel.Further, the slag discharge unit comprises a conveyor belt, wherein both ends of the conveyor belt are rolled up on two rollers, and an end portion of one of the rollers is in a transmission connection via a second synchronous belt unit with the drive motor in driving coupling; and the conveyor belt is arranged below the simulated cutting head unit.In this solution, the conveyor belt can laterally transport away the discharged slag floor without impairing the continuity of the simulation device.Further, the slag discharge unit comprises two bases, the two bases respectively supporting the two ends of the two rolls and rotatably connected to the rolls; and a side baffle is disposed on the top of each of the two bases.Furthermore, a gas regulating valve is arranged on the gas line.Further, the foaming device is a foaming machine, and the foaming machine is internally filled with polyurethane and water.Further, the gas supply system is a nitrogen tank.The utility model has the following advantageous effects.In a foaming agent-based high viscosity layer sign construction simulating apparatus provided in the utility model, nitrogen gas is supplied through a nitrogen tank, and the nitrogen gas carries the foaming agent generated by the foaming machine and is transported to the slag bottom improving tank, and the slag bottom is modified in the slag bottom improving tank to reduce the internal friction angle and adhesion of the slag bottom and improve the flowability of the slag bottom. The improved slag floor falls into the disk housing body and the blade rotates on the drive shaft to cut the slag floor and simulate the shield advancement process. With the aid of the foaming agent, the digging of the slag floor is achieved and the remarkable effect of the foaming agent on improving the properties of the slag floor is verified, which provides an experimental basis and technical support for the application of foaming agents in the mining of a high viscosity layer.Brief Description of the DrawingsFIG. 1 is a structural schematic front view of a shield construction simulating apparatus for a high viscosity layer based on a foaming agent according to the invention; FIG. 2 is a structural schematic rear view of a shield construction simulating apparatus for a high viscosity layer based on a foaming agent according to the invention.Description of the Reference Numerals:1, Foaming agent preparation unit; 11, gas supply system; 12, foaming device; 13, gas pipe; 14, foaming pipe; 15, gas regulating valve; 2, slag bottom improving tank; 21, slag bottom tank; 22, agitator; 23, agitating slurry; 24, slag bottom transfer pipe; 3, simulated cutting head unit; 31, disk case body; 32, drive shaft; 33, drive motor; 34, slag bottom discharge pipe; 35, blade; 36, first timing belt unit; 4, slag discharge unit; 41, conveyor belt; 42, roller; 43, second timing belt unit; 44, pedestal; 45, side baffle; 5, liquid supply pipe.Detailed DescriptionThe utility model is explained in more detail below with reference to the attached drawings and the detailed description.Although exemplary embodiments of the utility model are described above for clarity by those skilled in the art, it should be understood that the utility model is not limited to this detailed description and that various changes that will be apparent to those skilled in the art may be made without departing from the spirit and scope of the utility model as defined by the appended claims.All inventions and embodiments that make use of the concept of the invention fall within the scope of the invention.Embodiment 1As shown in FIGS. 1 and 2, the present embodiment provides a shield construction simulating apparatus for a highly viscous layer based on a foaming agent.The sign construction simulation device can simulate a scenario of tunnel propulsion in the highly viscous layer with the aid of a foaming agent. It comprises in particular:a foaming agent preparation unit 1, a slag soil improving tank 2, a simulated cutting head unit 3, and a slag discharge unit 4;wherein the foaming agent preparation unit 1 is for generating foaming agent; the foaming agent preparation unit 1 is connected to the slag soil improvement tank 2 via a liquid supply line 5, and the liquid supply line 5 can transport the foaming agent to the slag soil improvement tank 2; a simulated cutting head unit 3 is arranged at the bottom of the slag soil improvement tank 2, and the simulated cutting head unit 3 is for digging the slag soil and simulating a shield advancement process; and a slag discharge unit 4 is arranged at the outlet of the simulated cutting head unit 3.The foaming agent preparation unit 1 includes a gas supply system 11 and a foaming device 12. The gas pipe 13 is provided with a gas regulating valve 15. The foam generating device 12 is connected to the liquid supply line 5 via a foam line 14. The gas supply system 11 generates gas, and the foaming agent is generated from the foaming device 12, and the gas and the foaming agent are mixed in the liquid supply pipe 5, and the gas carries the foaming agent to the slag bottom improving tank 2.In the present embodiment, the foaming device 12 is a foaming machine, and the type of the foaming machine is tf-4A; the foaming machine is internally filled with polyurethane and water; and the gas supply system 11 is a nitrogen tank. The foaming device and the nitrogen tank may be disposed in the same housing to facilitate transportation.The slag bottom improving tank 2 includes a slag bottom tank 21, an agitator 22, an agitation slurry 23, and a slag bottom transfer line 24.The liquid supply pipe 5 is connected to a side wall of the slag bottom tank 21. A filling opening is disposed at the top of the slag bottom tank 21. An agitator 22 is disposed at the top of the slag bottom tank 21, and an agitator shaft of the agitator 22 penetrates the inside of the slag bottom tank 21 and is connected to the agitating slurry 23; and a slag bottom transfer pipe 24 is connected to the bottom of the slag bottom tank 21. The agitator 22 is started, the agitator 22 drives the agitating slurry 23 to rotate, the slag floor and foaming agent are agitated during the rotation, and the two substances are completely contacted and mixed to ensure that the foaming agent can effectively improve the slag floor.The simulated cutting head unit 3 includes a disk case body 31, a drive shaft 32, and a blade 35. A drive shaft 32 is disposed inside the disc case body 31. A plurality of blades 35 are disposed around the drive shaft 32. An end portion of the drive shaft 32 protrudes from a side wall of the pulley case body 31 and is in transmission communication with the drive motor 33 via a first timing belt unit 36. A slag bottom discharge channel 34 is arranged at the bottom of the disc housing body 31. The drive motor 33 may drive the rotation of the drive shaft 32, and the blade 35 on the drive shaft 32 follows the rotation of the drive shaft 32. The excavated slag bottom is discharged through the slag bottom discharge passage 34.The slag discharge unit 4 includes a conveyor belt 41 and two rollers 42. One end portion of one of the rollers 42 is in transmission communication with the drive motor 33 via a second timing belt unit 43. The conveyor belt 41 is arranged below the simulated cutting head unit 3. The conveyor belt can transport away the discharged slag floor laterally without impairing the continuity of the simulation system.The slag discharge unit 4 further comprises two bases 44. the two bases 44 respectively support the two ends of the two rolls 42 and are rotatably connected to the rolls 42. On the top side of each of the two bases 44 a side guide wall 45 is arranged.Embodiment 2This embodiment provides a shield simulation apparatus for a highly viscous layer based on foaming agent based on Embodiment 1, and provides a method for shield simulation for a highly viscous layer based on foaming agent in an eastern coastal region, the steps of the execution being as follows.S 1, corresponding to the geological conditions of the construction sector, the ratio of foaming agent to sample volume of the slag base is set to 1:25.S 2, the actually collected sample of the slag bottom is poured into a slag bottom improving tank 2, and the rotation speed of an adjustable agitator 22 disposed in the slag bottom improving tank 2 is 25 U / min; and the improvement process of the flowability, adhesiveness, and compressibility of the slag bottom by the foaming agent is simulated by uniformly mixing foam and slag bottom with agitation.S 3, the slag bottom in the slag bottom improving tank 2 enters the slag bottom discharge channel 34 after passing through the simulated cutting head unit 3; and the speed of the conveyor belt 41 is 7.5 m / min.Embodiment 3This embodiment provides a shield simulation apparatus for a highly viscous layer based on foaming agent based on Embodiment 1, and provides a method for shield simulation for a highly viscous layer based on foaming agent in a northern coastal region, the steps of the embodiments being as follows.S1, corresponding to the geological conditions of the construction sector, the ratio of a foaming agent to a sample volume of the slag base is set to 1:33.S 2, the actually collected sample of the slag bottom is poured into a slag bottom improving tank 2, and the rotation speed of an adjustable agitator 22 disposed in the slag bottom improving tank 2 is 40 U / min; and the improvement process of the flowability, adhesiveness, and compressibility of the slag bottom by the foaming agent is simulated by uniformly mixing foam and slag bottom with agitation.S 3, the slag bottom in the slag bottom improvement tank 2 enters the slag bottom discharge channel 34 after passing through the simulated cutting head unit 3; and the speed of the conveyor belt 41 is 6 m / min.It will be understood by those skilled in the art that the examples provided herein are intended to aid in the understanding of the principles of the invention and that the scope of the invention is not intended to be limited to the specific illustrations and examples. Based on the technical suggestion disclosed in the utility model, those skilled in the art can make various other specific modifications and combinations without departing from the spirit of the utility model, and these modifications and combinations still fall within the scope of the utility model.The utility model discloses a shield structural simulation apparatus for a high viscosity layer based on foaming agent, which falls within the technical field of shield structural layer simulation. The problem is solved that existing sign simulation test devices cannot simulate the propulsion in the highly viscous layer with the aid of a foaming agent. Specifically, it comprises a foaming agent preparation unit, a slag bottom improving tank and a simulated cutting head unit. The foaming agent preparation unit is connected to the slag bottom improving tank via a liquid supply line. A simulated cutting head unit is arranged at the bottom of the slag bottom improvement tank and a slag discharge unit is arranged at the outlet of the simulated cutting head unit. In the utility model, the foaming agent and the slag bottom improving tank improve the mixing of the residual bottom in the tank, decrease the internal friction angle and adhesion of the slag bottom, improve the flowability of the slag bottom, and thus modify the slag bottom. The simulated cutting head unit is used to trench the slag floor and simulate the shield process. The excavation of the slag floor is achieved by the cooperation of the foaming agent, which offers the experimental basis and technical support for the use of foaming agents in the shield construction of a highly viscous layer.

Claims

A shield construction simulating apparatus for a high viscosity layer based on foaming agent, characterized in thatthe apparatus comprises a foaming agent preparing unit (1), a slag soil improving tank (2), a simulated cutting head unit (3), and a slag discharge unit (4); wherein the foaming agent preparing unit (1) is connected to the slag soil improving tank (2) via a liquid supply line (5); the simulated cutting head unit (3) is disposed at the bottom of the slag soil improving tank (2); and the slag discharge unit (4) is disposed at an outlet of the simulated cutting head unit (3).The foaming agent-based high viscosity layer sign construction simulating apparatus according to claim 1, characterized in that the foaming agent preparing unit (1) comprises a gas supply system (11) and a foaming device (12), the gas supply system (11) being connected to the liquid supply pipe (5) via a gas pipe (13); and the foaming device (12) being connected to the liquid supply pipe (5) via a foaming pipe (14).The foaming agent-based high viscosity layer sign construction simulating apparatus according to claim 2, characterized in that the slag bottom improving tank (2) comprises a slag bottom tank (21), and the liquid supply pipe (5) is connected to a side wall of the slag bottom tank (21); an agitator (22) is disposed at the top of the slag bottom tank (21), and an agitator shaft of the agitator (22) penetrates the inside of the slag bottom tank (21) and is connected to an agitator slurry (23); and a slag bottom transfer pipe (24) is connected to the bottom of the slag bottom tank (21).The foaming agent-based high viscosity layer sign construction simulating apparatus according to claim 3, characterized in that the simulated cutting head unit (3) comprises a disk case body (31), wherein the top of the disk case body (31) is provided with an opening connected to the bottom of the slag bottom transfer pipe (24); a drive shaft (32) is disposed inside the disk case body (31); multiple blades (35) are disposed around the drive shaft (32); an end portion of the drive shaft (32) exits from a side wall of the disk case body (31) and is in transmission communication with a drive motor (33) via a first timing belt unit (36); and a slag bottom discharge duct (34) is disposed at the bottom of the disk case body (31).The shield structure simulating apparatus for highly viscous foaming agent-based layer according to claim 1, characterized in that the slag discharge unit (4) comprises a conveyor belt (41), both ends of the conveyor belt (41) are wound on two rollers (42), and an end portion of one of the rollers (42) is in transmission communication with the driving motor (33) via a second timing belt unit (43); and the conveyor belt (41) is disposed below the simulated cutting head unit (3).The shield type simulation apparatus for a foaming agent-based high viscosity layer according to claim 5, characterized in that the slag discharge unit (4) further comprises two bases (44), the two bases (44) respectively supporting the two ends of the two rollers (42) and rotatably connected to the rollers (42); and a side baffle (45) is disposed at the top of each of the two bases (44).The shield construction simulating apparatus for a highly viscous layer based on a foaming agent according to any one of claims 2 to 4, characterized in that a gas regulating valve (15) is disposed on the gas pipe (13).The shield construction simulating apparatus for a highly viscous layer based on a foaming agent according to any one of claims 2 to 4, characterized in that the foaming apparatus is a foaming machine internally filled with polyurethane and water.The shield construction simulating apparatus for a highly viscous layer based on a foaming agent according to any one of claims 2 to 4, characterized in that the gas supply system (11) is a nitrogen tank.

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