CN115718188A - Shield muck improvement comprehensive evaluation test device and method - Google Patents

Abstract

The invention discloses a shield muck improvement comprehensive evaluation test device and a shield muck improvement comprehensive evaluation test method, which comprise the following steps: a support portion; the permeability testing part is arranged on the supporting part and is communicated with the gas supply part; an earth pressure loading part disposed on the supporting part and used for applying pressure to the permeability testing part; the cutter head shearing driving part is arranged in the permeability testing part, one part of the cutter head shearing driving part is used for stirring the sample in the permeability testing part, and the other part of the cutter head shearing driving part is arranged on the supporting part; the propelling part is arranged on the supporting part and is used for driving the permeability testing part to move up and down; and the modifier injection part is connected with the cutter head shearing driving part and inputs a modifier to the permeability testing part through the cutter head shearing driving part. The invention can simulate the actual stress state of the tunnel face and the muck in the soil bin in the actual construction process, and better ensures the reliability of the model test.

Description

A comprehensive evaluation test device and method for shield muck improvement

technical field

The invention relates to the field of test equipment for evaluating shield-tunnel slag modifiers, in particular to the technology of using shield model tests to reflect the migration state and mechanical properties of slag during shield-tunnel construction, and specifically relates to a Comprehensive evaluation test device and method for shield muck improvement.

Background technique

The muck improvement technology is one of the key technologies to ensure the smooth progress of the earth pressure balance shield tunneling. The shield model test can reflect the migration state and mechanical properties of the muck during the shield tunneling process to a large extent, and then guide the site construction.

At present, some existing earth pressure balance shield indoor model test systems and devices have problems such as large errors, simple structures, and low sample utilization, which make the relevant test devices unable to restore the actual working conditions well.

For example, the Chinese Invention Patent Publication No. CN106124364A discloses a test method and device for measuring the plasticity of shield-tunnel slag-soil improvement mixture, which includes: horizontally pushing the rocker arm to drive the driving shaft to rotate, and the stirring blade installed on the driving shaft to push the soil The muck-soil mixture in the bin flows, and the flow of the muck-soil mixture in the soil bin exerts a force on the stirring blade installed on the inner side of the outer disk to make the outer disk rotate; according to the law of energy conservation, energy consumption occurs when the mixture in the soil bin flows , and the mass of the outer disk is large, when the driving shaft and the outer disk rotate at a uniform angular velocity, there will be an angular velocity difference between the two; using the relationship curve between the ratio of the angular velocity difference to the angular velocity of the driving shaft and the rotational torque of the driving shaft, the force can be quantitatively analyzed The correlation between the role of the slag soil improvement mixture and the plastic fluidity, which requires high measurement accuracy and durability of related components.

For example, the Chinese Invention Patent Publication No. is CN106669505A, a kind of slag soil improvement experimental stirring device, which includes a stirring motor, a motor fixing frame, a transmission shaft, a stirring cutter head, a stirring bucket, a supporting screw, a lifting screw, a stirring support, a cart, Positioning block, frequency conversion control cabinet and torque sensor; the stirring motor is connected with the frequency conversion control cabinet; the motor fixing frame is fixed on the stirring support, the stirring motor is fixedly connected with the motor fixing frame, the output shaft of the stirring motor is connected with the transmission shaft, and the transmission shaft It is connected with the torque sensor, and the torque sensor is connected with the stirring cutterhead; there is a mixing bucket under the mixing cutterhead, and the mixing bucket is clamped on the trolley through the positioning block, and the trolley is connected to the upper part of the stirring bracket through the lifting screw and the supporting screw. connected. Compared with the effect of the actual shield cutter head cutting muck, it has been greatly simplified, which cannot reflect the actual construction status well.

For example, the Chinese Invention Patent Publication No. CN105952461A is a test device and method for simulating soil improvement in earth pressure balance shield construction, including a pressurization system, a test soil bin, a cutterhead system, a cutterhead drive system and a screw excavation system. During the test, the air compressor is used to pressurize the mud tank, and the mud in the tank is pressed into the elastic liquid bag; the pressure is applied to the soil through the high-pressure mud, which can simulate the trapezoidal load on the actual engineering cutter head. The process of cutting muck by the shield cutter head is simulated in real terms, and a pressure environment consistent with the actual project is formed in the shield soil chamber to ensure the reliability of the simulation to the greatest extent. However, the method of setting the additive inlet and water inlet at a fixed position cannot simulate the improvement effect of the modifier on tool wear and dregs on the face when the modifier is injected from the cutter head injection port during the actual construction process.

In view of this, the present invention is proposed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a comprehensive evaluation test device and control method for shield dreg improvement, which can ensure the reliability of the model test.

In order to solve the problems of the technologies described above, the present invention adopts the basic idea of technical solution to be:

A comprehensive evaluation test device for shield muck improvement, including:

support part;

The permeability testing part is arranged on the support part, and the permeability testing part communicates with the air supply part;

an earth pressure loading part, arranged on the support part, and used to apply pressure to the permeability testing part;

The cutterhead shearing driving part is arranged in the permeability testing part, and is used to stir the sample in the permeability testing part, and the other part is arranged on the supporting part;

The propulsion part is arranged on the support part and is used to drive the permeability test part to move up and down;

The modifier injection part is connected with the cutterhead shearing driving part, and inputs the modifier into the permeability testing part through the cutterhead shearing driving part.

In a preferred embodiment of any of the above schemes, the permeability testing unit includes:

The soil tank simulation part is used to store the slag and the amendment, wherein the soil tank simulation part includes a No. 1 steel cylinder and a No. 2 steel cylinder, and the No. 1 steel cylinder is provided with a first earth pressure sensor, and the No. 1 steel cylinder communicates with the No. 2 steel cylinder, and both the No. 1 steel cylinder and the No. 2 steel cylinder are provided with an outer wire water inlet and an outer wire water outlet, and the outer wire The water inlet and the water outlet of the outer wire are connected with the air supply device, and the second earth pressure sensor is arranged in the No. 2 steel cylinder;

A sealing connecting piece is connected to the bottom of the No. 2 steel cylinder, and a third earth pressure sensor is arranged in the sealing connecting piece.

In a preferred embodiment of any of the above schemes, the cutting drive part of the cutter head includes:

A variable frequency drive motor is arranged on the support part;

A dynamic torque sensor, the input end of which is connected to the output end of the variable frequency drive motor;

A steering connector, the input end of which is connected to the output end of the steering connector;

a dowel rod, the input end of which is connected to the output end of the steering connector;

The cutter head is connected to the dowel bar in the middle and is arranged in the No. 2 steel cylinder;

The cutter is connected with the cutter head through the cutter holder.

In a preferred embodiment of any of the above schemes, the cutter head is a spoke structure, the spoke width is 1 cm, the angle between adjacent spokes is 60 degrees, and a plurality of cutters are arranged on each of the spokes.

In a preferred embodiment of any of the above schemes, the cutting drive part of the cutter head further includes:

The improvement agent injection port is arranged on the cutter head, and the inside of the cutter head is a cavity, which communicates with the improvement agent injection port, wherein, the inside of the dowel bar is a cavity, which is connected to the The cavity inside is connected;

A high-pressure pipe, one end communicates with the cavity of the dowel bar, and the other end communicates with the modifier delivery and generating device, wherein there are two high-pressure pipes;

The improver reservoir communicates with the improver delivery and generation device through the high-pressure pipe.

In a preferred embodiment of any of the above schemes, the support part includes:

base;

The steel plate is fixed by the propulsion support reaction force, and is connected with the base through the bracket;

There are a plurality of push-stop round rods, one end of each push-stop round rod is connected to the push support reaction force fixed steel plate;

The counterforce horizontal frame structure is supported, and the two ends are respectively connected with the other ends of the two pushing and limiting round rods.

In a preferred embodiment of any of the above schemes, the propulsion part includes:

The push base steel plate is arranged on the push limit round rod, and can slide up and down relative to the push limit round rod;

A second hydraulic jack, one end of which is connected to the steel plate of the propulsion base;

The propulsion pressure sensor is arranged at the other end of the second hydraulic jack and is connected with the reaction force horizontal frame structure.

In a preferred embodiment of any of the above schemes, the earth pressure loading part includes:

A flanged steel plate is arranged on the No. 1 steel cylinder;

There are multiple reaction shafts, one end is connected to the flange connecting steel plate, and the other end is connected to the reaction steel plate;

A first hydraulic jack, one end is connected to the middle part of the reaction force steel plate, and the other end is connected to the loading pressure sensor;

The barrel-shaped pressure piece is slidably arranged in the No. 1 steel cylinder and the No. 2 steel cylinder, and the loading pressure sensor is set in the middle of the barrel-type pressure piece, so as to realize the pressure on the first hydraulic jack. Under the pressure, the barrel-shaped pressing part is driven to move up and down by the loading pressure sensor.

In a preferred embodiment of any of the above solutions, there are two second hydraulic jacks arranged symmetrically.

In the second aspect, a comprehensive evaluation test method for improvement of shield dregs is applied to the comprehensive evaluation test device for improvement of shield dregs. The test method includes the following steps:

Step 1: Weigh and record the quality of a single tool, install the tool on the specific position of the spoke of the cutter head, insert the dowel bar from the circular opening at the bottom center of the second steel cylinder, and connect one end of the dowel bar through the coupling Fixed with the steering connector;

Step 2: Adjust the upper and lower positions of the propulsion base steel plate so that the cutter head is initially located at the bottom of the No. 2 steel cylinder, and adjust the position and top stroke of the second hydraulic jack so that the top of the second hydraulic jack is in contact with the propulsion base steel plate;

Step 3: Fill the No. 1 steel cylinder and the No. 2 steel cylinder with samples, and compact them layer by layer. Install the barrel-shaped pressure part and the first hydraulic jack in sequence, adjust the pressure of the first hydraulic jack and observe the first soil The pressure sensor, the second earth pressure sensor and the third earth pressure sensor read to the preset earth pressure value;

Step 4: Turn on the cutterhead shear drive unit, data acquisition instrument, and data analysis equipment to record and observe the changes in the dynamic torque sensor in real time;

Step 5: When the reading of the dynamic torque sensor is relatively stable, adjust the pressure and flow rate of the pressure stabilizing valve according to the type of soil modifier set according to the experiment expectation, and then open the modifier injection valve;

Step 6: Increase the pressure of the second hydraulic jack on the steel plate of the propulsion base according to the propulsion speed and thrust under the required simulation conditions, observe and use data analysis equipment to record in real time the propulsion pressure sensor and the first earth pressure sensor during the propulsion process , the second earth pressure sensor, the third earth pressure sensor and the fluctuation of the cutter head torque;

Step 7: The permeability test is carried out at the same time as step 6. After adjusting the pressure stabilizing valve to the set pressure, open the valve of the air supply device in the permeability test section, and record the flow values of the four seepage outlets per minute;

Step 8: After the cutter head reaches the limited position, the modified sample under the dosage and ratio of the single improver is finished, and the cutter on the cutter head is removed, weighed and recorded. After saving all the experimental data of a single time, further adjustments can be made Improver type, dosage or ratio, repeat the experiment according to step 1 to step 7;

Step 9: After the sample group to be tested is completed, the data of the sensor can be viewed in real time through the PC terminal, and the optimal parameters of the modifier for the specific muck sample can be selected, or the test results of different samples can be comprehensively analyzed to obtain The regular characteristics of shield tunneling parameters under different working conditions and modifiers guide engineering practice under specific working conditions.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

Utilize the first hydraulic jack to load and apply pressure to the soil with the help of the internal force of the structure, which can realize the relative movement and shearing of the cutterhead in the pressurized soil, and can simulate the operation of the face and the dregs in the soil bin during the actual construction process. The actual stress state better guarantees the reliability of the model test.

It can realize the improvement effect simulation of various modifier parameters such as foam modifier, mud, polymer, etc. According to the injection method of the shield machine modifier, the spokes on the cutter head are provided with modifier outlets, and the hollow connection shaft is used to connect the The muck modifier is injected into the dregs from the cutter head panel, which can more realistically simulate the dynamic improvement process of muck during shield tunneling.

The device integrates functions such as soil improvement evaluation under pressure, soil permeability test, and tool wear evaluation. Under the permeability, evaluate the abrasiveness of the muck on the tool.

The present invention can simultaneously obtain the dynamic changes of shield excavation data such as propulsion force, propulsion speed, soil pressure of soil bin, cutter head torque and cutter wear degree, etc. Special test equipment for design optimization of tunneling parameters and test standards for performance evaluation of muck soil improvement.

The test device proposed by the present invention has the advantages of various functions, simple structure, quick operation, and low test cost. The type and parameter selection of dregs modifiers used in the construction of lower earth pressure balance shield provide the necessary preliminary laboratory test data reference.

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. Hereinafter, some specific embodiments of the present application will be described in detail with reference to the accompanying drawings in an exemplary rather than restrictive manner. The same reference numerals in the drawings indicate the same or similar parts or parts, and those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

Fig. 1 is an exploded diagram of a comprehensive evaluation test device for shield tunneling muck soil improvement according to the present invention.

Fig. 2 is a structural schematic diagram of the comprehensive evaluation test device for shield tunneling muck improvement of the present invention.

Fig. 3 is a schematic diagram of soil pressure loading of the comprehensive evaluation test device for shield tunneling muck soil improvement according to the present invention.

Fig. 4 is a front view of No. 1 steel cylinder and No. 2 steel cylinder of the shield tunneling muck improvement comprehensive evaluation test device of the present invention.

Fig. 5 is a schematic diagram of the simulation part of the soil chamber of the comprehensive evaluation test device for shield tunneling muck soil improvement of the present invention.

Fig. 6 is a schematic diagram of the permeability test section of the comprehensive evaluation test device for shield tunneling muck soil improvement according to the present invention.

Fig. 7 is a schematic diagram of the cutter head of the comprehensive evaluation test device for shield tunneling muck soil improvement of the present invention.

Fig. 8 is a schematic diagram of the cutterhead shearing driving part of the comprehensive evaluation test device for shield tunneling muck soil improvement according to the present invention.

Fig. 9 is a schematic diagram of the propelling part of the comprehensive evaluation test device for shield tunneling muck soil improvement according to the present invention.

Fig. 10 is a schematic diagram of the improvement agent injection part of the comprehensive evaluation test device for shield tunneling muck soil improvement of the present invention.

Fig. 11 is a schematic flow chart of the comprehensive evaluation test method for shield tunneling muck soil improvement according to the present invention.

In the figure: reaction force steel plate 1, reaction force shaft 2, first hydraulic jack 3, flange connection steel plate 4, loading pressure sensor 5, barrel-shaped pressure part 6, No. 1 steel cylinder 7, outer wire water inlet 8, Outlet of outer wire 9, No. 2 steel cylinder 10, supporting reaction force horizontal frame structure 11, propulsion pressure sensor 12, second hydraulic jack 13, cutter head 14, sealing connector 15, propulsion limit round rod 16, propulsion base Steel plate 17, dowel bar 18, propulsion support reaction force fixed steel plate 19, steering connector 20, bracket 21, dynamic torque sensor 22, variable frequency drive motor 23, base 24, tool holder 25, modifier injection port 26, tool 27 , Improver reservoir 28, high pressure pipe 29, improver delivery and generation device 30, first earth pressure sensor 31, second earth pressure sensor 32, third earth pressure sensor 33.

It should be noted that these drawings and text descriptions are not intended to limit the concept scope of the present invention in any way, but illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should therefore not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

The following embodiments of the present application take the shield tunneling muck improvement comprehensive evaluation test device and its control method as an example to describe the scheme of the present application in detail, but this embodiment cannot limit the protection scope of the present application.

Example

As shown in Figures 1 to 11, the present invention provides a comprehensive evaluation test device for shield dreg improvement, including:

support part;

The permeability testing part is arranged on the support part, and the permeability testing part communicates with the air supply part;

an earth pressure loading part, arranged on the support part, and used to apply pressure to the permeability testing part;

The cutterhead shearing driving part is arranged in the permeability testing part, and is used to stir the sample in the permeability testing part, and the other part is arranged on the supporting part;

The propulsion part is arranged on the support part and is used to drive the permeability test part to move up and down;

The modifier injection part is connected with the cutterhead shearing driving part, and inputs the modifier into the permeability testing part through the cutterhead shearing driving part.

In the shield dregs improvement comprehensive evaluation test device described in the embodiment of the present invention, the earth pressure loading part is used to load the soil body, and the internal force of the structure is used to exert pressure on the soil body, so that the cutting drive part of the cutterhead can realize the The relative movement and shearing in the middle can simulate the actual stress state of the face and the muck in the soil bin during the actual construction process, which can better ensure the reliability of the model test. The device integrates the dregs under pressure Improvement evaluation, slag permeability test, tool wear evaluation and other functions can realize the slag improvement evaluation of different types of slag at the same time, test the permeability of slag under shearing, and evaluate the impact of slag on tools Abrasiveness, the present invention can simultaneously obtain the dynamic changes of shield tunneling data such as propulsion force, propulsion speed, soil pressure of soil bin, cutterhead torque and tool wear degree, etc. The design and optimization of shield excavation parameters and the test standard for performance evaluation of dregs and other aspects of special test equipment. The test device proposed by the present invention has the advantages of multiple functions, simple structure, quick operation, and low test cost. The test process can be compared A comprehensive and systematic evaluation of the comprehensive improvement effect of shield tunneling muck in the actual construction process can provide the necessary preliminary laboratory test data reference for the selection of the type and parameters of the muck modifier for earth pressure balance shield tunneling under different working conditions.

As shown in Figures 1 to 11, the permeability testing section includes:

The soil tank simulation part is used to store slag and improver, wherein, the soil tank simulation part includes No. 1 steel cylinder 7 and No. 2 steel cylinder 10, and No. 1 steel cylinder 7 is provided with No. An earth pressure sensor 31, and the No. 1 steel cylinder 7 communicates with the No. 2 steel cylinder 10, and the No. 1 steel cylinder 7 and the No. 2 steel cylinder 10 are all provided with an outer wire water inlet 8 and an outer The wire water outlet 9, and the outer wire water inlet 8 and the outer wire water outlet 9 are in communication with the air supply device, and the second steel cylinder 10 is provided with a second earth pressure sensor 32;

The sealing connector 15 is connected to the bottom of the No. 2 steel cylinder 10 , and a third earth pressure sensor 33 is arranged in the sealing connector 15 .

In the comprehensive evaluation test device for the improvement of shield dregs described in the embodiment of the present invention, the No. 1 steel cylinder 7 and the No. 2 steel cylinder 10 have the same structure, both of which are barrel-shaped structures with openings at the upper and lower ends. The size is 15cm in diameter, 15cm in height, and 5mm in thickness, and the material is stainless steel. The upper and lower ends of No. 1 steel cylinder 7 and No. 2 steel cylinder 10 are respectively provided with flange connecting plates with an outer diameter of 20 cm, an inner diameter of 15 cm, and a thickness of 1 cm. , the two steel cylinders are bolted through four 10mm round holes reserved on the flange connecting plate, the lower end of the No. A first earth pressure sensor 31 is arranged inside the cylinder 7, a second earth pressure sensor 32 is arranged inside the No. 2 steel cylinder 10, a third earth pressure sensor 33 is arranged inside the sealing connector 15, and the The No. 1 steel cylinder 7 and the No. 2 steel cylinder 10 are filled with samples, and compacted layer by layer. The barrel-shaped pressure member 6 and the first hydraulic jack 3 are installed in sequence, and the pressure of the first hydraulic jack 3 is adjusted. Observe that the first earth pressure sensor 31 , the second earth pressure sensor 32 and the third earth pressure sensor 33 count up to the preset earth pressure value.

As shown in Figures 1 to 11, the cutter head shearing driving part includes:

A variable frequency drive motor 23 is arranged on the support portion;

A dynamic torque sensor 22, the input end is connected with the output end of the variable frequency drive motor 23;

A steering connector 20, the input end is connected to the output end of the steering connector 20;

The dowel rod 18, the input end is connected to the output end of the steering connector 20;

The cutter head 14 is connected to the dowel bar 18 in the middle, and is arranged in the No. 2 steel cylinder 10;

Cutter 27 is connected with described cutterhead 14 by cutter holder 25, and described cutterhead 14 is a spoke structure, and spoke width is 1cm, and adjacent spoke included angle is 60 degree, and all are set on each described spoke 27 knives.

In the comprehensive evaluation test device for shield dreg improvement described in the embodiment of the present invention, the cutter head is placed in the No. 2 steel cylinder 10 during the experiment, and the cutter head is a spoke structure with a spoke width of 1 cm. The included angle of the spokes is 60 degrees, and the spokes are provided with cutter holders 25, cutters 27 and modifier injection ports 26, and the cutter head 14 and the dowel 18 are connected by means of embedded groove structures and flanges. The cutter 27 is a square shape, which can increase the friction between it and the filler when in use.

As shown in Figures 1 to 11, the cutterhead shearing driving part further includes:

The improver injection port 26 is arranged on the cutter head 14, the inside of the cutter head 14 is a cavity, and communicates with the improver injection port 26, wherein the dowel bar 18 is a cavity, and communicate with the cavity in the cutter head 14;

One end of the high-pressure pipe 29 communicates with the cavity of the dowel rod 18, and the other end communicates with the improver delivery and generating device 30, wherein there are two high-pressure pipes 29;

The modifier reservoir 28 communicates with the modifier delivery and generation device 30 through the high-pressure pipe 29 .

In the comprehensive evaluation test device for shield tunneling muck improvement described in the embodiment of the present invention, the improver in the middle of the improver storage 28 is transferred to the cavity in the dowel 18 through the improver delivery and generation device 30 through the high-pressure pipe 29 body, and then transferred from the cavity in the dowel bar 18 to the cavity on the cutter head 14, thereby spraying from the modifier injection port 26, the shown modifier reservoir 28, the dowel bar 18 The central hole structure is connected to the 6mm high-pressure pipe 29 with a quick-connect air pipe joint. The modifier delivery and generating device 30 can provide a pressure of 0-8 bar to deliver the modifier to the modifier injection port on the spoke of the cutterhead to realize the soil storage system. The medium dregs are mixed with the modifier, which can be an aqueous solution of common shield dreg improvement materials such as foam agents, bentonite, and polymers, which can realize various improvements such as foam modifiers, mud, and polymers. According to the improvement effect simulation of the agent parameters, according to the injection method of the shield machine improver, the spokes on the cutter head are provided with the improver outlet, and the muck improver is injected into the muck from the cutter head panel in the form of a hollow connecting shaft, which can be more realistic. The dynamic improvement process of dregs in the simulated shield excavation process, wherein, the improvement agent injection port 26 has multiple, and uniform distribution, in the embodiment of the present invention, preferably, the variable frequency drive motor 23 can realize positive turn and reverse, and the high-pressure pipe 29 is a flexible pipe, and a sufficient amount is reserved, therefore, the dowel rod 18 rotates during the experiment, and the high-pressure pipe 29 can be wound around the periphery of the dowel rod 18, But it will not affect normal use.

As shown in Figures 1 to 11, the support part includes:

base 24;

The propulsion counterforce fixed steel plate 19 is connected with the base 24 through the bracket 21;

There are multiple push-stop round rods 16, and one end of each push-stop round rod 16 is connected to the push support counter force fixed steel plate 19;

The two ends of the reaction force horizontal frame structure 11 are respectively connected with the other ends of the two pushing and limiting round rods 16 .

As shown in Figures 1 to 11, the propulsion part includes:

Propel the base steel plate 17, which is arranged on the said push limit round rod 16, and can slide up and down relative to said push limit round rod 16;

One end of the second hydraulic jack 13 is connected to the propulsion base steel plate 17, and two of the second hydraulic jacks 13 are symmetrically arranged;

The propulsion pressure sensor 12 is arranged at the other end of the second hydraulic jack 13 and is connected with the reaction force horizontal frame structure 11 .

In the comprehensive evaluation test device for the improvement of shield tunneling muck described in the embodiment of the present invention, the central part of the propulsion base steel plate 19 is reserved with a passage port for the dowel rod, and is provided with a passage port for the propulsion limit round rod around the center, and the passage port Some of them are equipped with ball bearing structure to realize the limit and fixation of the rods. The propulsion base steel plate 17 is connected with the No. 2 steel cylinder 10 by flanges, and pressure is applied to the counter force horizontal frame structure 11 through the hydraulic jack 8. The overall downward movement of the propulsion base steel plate provides a driving force for the relative upward movement of the cutter head 14 in the steel cylinder.

As shown in Figures 1 to 11, the earth pressure loading part includes:

The flanged steel plate 4 is arranged on the No. 1 steel cylinder 7;

There are multiple reaction shafts 2, one end is connected to the flange connection steel plate 4, and the other end is connected to the reaction steel plate 1;

The first hydraulic jack 3, one end is connected to the middle part of the reaction force steel plate 1, and the other end is connected to the loading pressure sensor 5;

The barrel-shaped pressing member 6 is slidably arranged in the No. 1 steel cylinder 7 and the No. 2 steel cylinder 10, and the loading pressure sensor 5 is arranged in the middle of the barrel-shaped pressing member 6, so as to achieve Under the pressure of the first hydraulic jack 3, the barrel-shaped pressing member 6 is driven to move up and down by the loading pressure sensor 5.

In the comprehensive evaluation test device for the improvement of shield dregs described in the embodiment of the present invention, the reaction force steel plate 1 is a stainless steel plate with a length of 800 mm, a width of 500 mm, and a thickness of 5 mm; the reaction force shaft 2 has a diameter of 20 mm and a length of 25 cm. The stainless steel cylindrical rod, with 5cm long M8 outer wires at both ends, the upper outer wire is used for the connection between the reaction force steel plate 1 and the reaction force shaft 2, and the lower end outer wire is used for flange connection between the steel plate 4 and the first The upper flange connection of the steel cylinder 7, the minimum height of the first hydraulic jack 3 is 30cm, the maximum height is 50cm, and the maximum design loading force is 40000N; the flange connection steel plate 4 has an outer diameter of 20cm, an inner diameter of 15cm, A ring structure with a thickness of 5mm; the outer diameter of the barrel-shaped pressurizing part 6 is 24 cm, the upper end is open and the lower end is closed, and the thickness of the steel part is 1 cm. During the experiment, the barrel-shaped pressurizing part 6 was placed in the one For the top of the muck sample in the steel cylinder 7, the first hydraulic jack 3 is placed in the barrel-shaped seal, the upper end is in contact with the reaction steel plate 4, and the loading pressure is provided by the first hydraulic jack 3 .

A comprehensive evaluation test method for improvement of shield dregs, which is applied to the comprehensive evaluation test device for improvement of shield dregs, and the test method includes the following steps:

Step 1: Weigh and record the quality of a single cutter 27, install the cutter 27 on the specific position of the spoke of the cutter head, insert the dowel 18 from the circular opening at the bottom center of the second steel cylinder 10, and connect the transmission through the coupling. One end of the force rod 18 is fixed to the steering connector 20;

Step 2: Adjust the upper and lower positions of the propulsion base steel plate 17 so that the initial position of the cutter head 14 is at the bottom of the No. 17 contacts;

Step 3: Fill samples into No. 1 steel cylinder 7 and No. 2 steel cylinder 10, and compact them layer by layer. Install the barrel-shaped pressure part 6 and the first hydraulic jack 3 in sequence, and adjust the first hydraulic jack 3 Pressure and observe the first earth pressure sensor 31, the second earth pressure sensor 32 and the third earth pressure sensor 33 counting up to the preset earth pressure value;

Step 4: Turn on the cutting drive unit of the cutter head, adjust the speed of the variable frequency drive motor 23 to 1-2r/min according to the experimental design, and turn on the data acquisition instrument and data analysis equipment to record and observe the change of the torque sensor display in real time;

Step 5: When the reading of the dynamic torque sensor 22 is relatively stable, open the modifier injection valve after regulating the pressure and flow rate of the pressure stabilizing valve according to the type and dosage parameters of the dregs modifier set according to the experiment expectation;

Step 6: Increase the pressure of the second hydraulic jack 13 on the steel plate 17 of the propulsion base according to the propulsion speed and thrust under the required simulated working conditions, observe and use data analysis equipment to record in real time the propulsion pressure sensor 12, the first Earth pressure sensor 31, the second earth pressure sensor 32, the third earth pressure sensor 33 and the fluctuation situation of cutter head torque;

Step 7: The permeability test is carried out at the same time as step 6. After adjusting the pressure regulator valve to the set pressure, open the air supply device in the permeability test department (including but not limited to air compressors, water storage tanks, and pressure regulator valves) valves, and record the flow values of the four seepage outlets per minute;

Step 8: After the cutter head 14 reaches the limited position, the improvement sample under the dosage and ratio of the single improver is finished, and the cutter 27 on the cutter head 14 is removed, weighed and recorded, and after saving all the experimental data of a single time, The type, amount or ratio of the improver can be further adjusted, and the experiment can be repeated according to steps 1 to 7;

Step 9: After the sample group to be tested is completed, the data of the sensor can be viewed in real time through the PC terminal, and the optimal parameters of the modifier for the specific muck sample can be optimized. Further, the thrust, Through comprehensive analysis of test results such as torque, tool wear, and slag permeability coefficient, the regular characteristics of shield tunneling parameters under different working conditions and modifiers can be obtained to guide engineering practice under specific working conditions.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims (10)

1. A comprehensive evaluation test device for shield muck improvement, characterized in that it comprises: support part; The permeability testing part is arranged on the support part, and the permeability testing part communicates with the air supply part; an earth pressure loading part, arranged on the support part, and used to apply pressure to the permeability testing part; The cutterhead shearing driving part is arranged in the permeability testing part, and is used to stir the sample in the permeability testing part, and the other part is arranged on the supporting part; The propulsion part is arranged on the support part and is used to drive the permeability test part to move up and down; The modifier injection part is connected with the cutterhead shearing driving part, and inputs the modifier into the permeability testing part through the cutterhead shearing driving part. 2. The comprehensive evaluation test device for shield dregs improvement according to claim 1, characterized in that, the permeability testing section includes: The soil tank simulation part is used to store the slag and the modifier, wherein, the soil tank simulation part includes No. 1 steel cylinder (7) and No. 2 steel cylinder (10), and the No. 1 steel cylinder ( 7) A first earth pressure sensor (31) is arranged inside, and the No. 1 steel cylinder (7) communicates with the No. 2 steel cylinder (10), and the No. 1 steel cylinder (7) and the No. 2 steel cylinder The cylinder (10) is provided with an outer wire water inlet (8) and an outer wire water outlet (9), and the outer wire water inlet (8) and the outer wire water outlet (9) are communicated with the air supply device, so The No. 2 steel cylinder (10) is provided with a second earth pressure sensor (32); The sealing connector (15) is connected to the bottom of the No. 2 steel cylinder (10), and a third earth pressure sensor (33) is arranged in the sealing connector (15). 3. The comprehensive evaluation test device for shield dregs improvement according to claim 2, characterized in that, the cutterhead shearing driving part comprises: A variable frequency drive motor (23), arranged on the support portion; A dynamic torque sensor (22), the input end of which is connected to the output end of the variable frequency drive motor (23); A steering connector (20), the input end of which is connected to the output end of the steering connector (20); The dowel rod (18), the input end is connected with the output end of the steering connector (20); The cutter head (14), the middle part is connected with the dowel bar (18), and is arranged in the No. 2 steel cylinder (10); The cutter (27) is connected with the cutter head (14) through a cutter holder (25). 4. shield dreg improvement comprehensive evaluation test device according to claim 3, is characterized in that, described cutter head (14) is a spoke structure, and spoke width is 1cm, and the angle between adjacent spokes is 60 degrees, and A plurality of knives (27) are arranged on each of the spokes. 5. The comprehensive evaluation test device for shield tunneling dregs improvement according to claim 4, characterized in that, the cutter head shear drive part further comprises: The improving agent injection port (26) is arranged on the cutter head (14), and the inside of the cutter head (14) is a cavity, which communicates with the improving agent injection port (26), wherein the force transmission There is a cavity in the rod (18), and communicates with the cavity in the cutter head (14); One end of the high-pressure pipe (29) communicates with the cavity of the dowel rod (18), and the other end communicates with the improver delivery and generating device (30), wherein there are two high-pressure pipes (29); The improver reservoir (28) communicates with the improver delivery and generation device (30) through the high-pressure pipe (29). 6. The comprehensive evaluation test device for shield dregs improvement according to claim 5, characterized in that, the support part comprises: Base (24); Propel the counterforce and fix the steel plate (19), which is connected with the base (24) through the bracket (21); There are multiple push-stop round rods (16), one end of each push-stop round rod (16) is connected to the push support counterforce fixed steel plate (19); The counterforce horizontal frame structure (11) is supported, and the two ends are respectively connected with the other ends of the two advancing limit round rods (16). 7. The comprehensive evaluation test device for shield dreg improvement according to claim 6, characterized in that, the propulsion part includes: Propelling the base steel plate (17), which is arranged on the said propelling limiting round bar (16), and can slide up and down relative to said propelling limiting round bar (16); The second hydraulic jack (13), one end is connected with the said propulsion base steel plate (17); The propulsion pressure sensor (12) is arranged at the other end of the second hydraulic jack (13) and is connected with the reaction force horizontal frame structure (11). 8. The comprehensive evaluation test device for shield muck improvement according to claim 7, characterized in that the earth pressure loading part comprises: The flanged steel plate (4) is arranged on the No. 1 steel cylinder (7); There are multiple reaction force shafts (2), one end of which is connected to the flange connection steel plate (4), and the other end is connected to the reaction force steel plate (1); The first hydraulic jack (3), one end is connected with the middle part of the reaction force steel plate (1), and the other end is connected with the loading pressure sensor (5); Barrel-shaped pressurizing part (6), which is slidably arranged in the No. 1 steel cylinder (7) and No. 2 steel cylinder (10), and the loading pressure sensor (5) is arranged in the barrel-shaped pressurizing The middle part of the member (6), so that under the pressure of the first hydraulic jack (3), the loading pressure sensor (5) drives the barrel-shaped pressing member (6) to move up and down. 9. The comprehensive evaluation test device for shield tunneling muck improvement according to claim 8, characterized in that, two second hydraulic jacks (13) are arranged symmetrically. 10. A comprehensive evaluation test method for shield dreg improvement, characterized in that it is applied to the comprehensive evaluation test device for shield dreg improvement according to any one of claims 1 to 9, and the test method includes The following steps: Step 1: Weigh and record the quality of a single cutter (27), install the cutter (27) at a specific position on the spoke of the cutter head, and insert the dowel (18) from the circular opening at the bottom center of the second steel cylinder (10) , and fix one end of the dowel bar (18) to the steering connector (20) through a coupling; Step 2: Adjust the upper and lower positions of the propulsion base steel plate (17), so that the initial position of the cutterhead (14) is at the bottom of the No. The top of the hydraulic jack (13) is in contact with the propulsion base steel plate (17); Step 3: Fill the samples into the No. 1 steel cylinder (7) and the No. 2 steel cylinder (10), and compact them layer by layer. The barrel-shaped pressure member (6) and the first hydraulic jack (3) are sequentially Install, adjust the pressure of the first hydraulic jack (3) and observe the readings of the first earth pressure sensor (31), the second earth pressure sensor (32) and the third earth pressure sensor (33) to the preset earth pressure value; Step 4: Turn on the cutter head shear drive unit, data acquisition instrument, and data analysis equipment to record and observe the changes in the dynamic torque sensor (22) in real time; Step 5: When the reading of the dynamic torque sensor (22) is relatively stable, open the modifier injection valve after adjusting the pressure and flow rate of the pressure stabilizing valve according to the type of dregs modifier set according to the experiment expectation, and the dosage parameters; Step 6: Increase the pressure of the second hydraulic jack (13) on the steel plate (17) of the propulsion base according to the propulsion speed and thrust under the required simulated working conditions, observe and use the data analysis equipment to record the propulsion pressure sensor in real time during the propulsion process (12), the fluctuation situation of the first earth pressure sensor (31), the second earth pressure sensor (32), the third earth pressure sensor (33) and cutter head torque; Step 7: The permeability test is carried out at the same time as step 6. After adjusting the pressure stabilizing valve to the set pressure, open the valve of the air supply device in the permeability test section, and record the flow values of the four seepage outlets per minute; Step 8: After the cutter head (14) reaches the limited position, the improvement sample under the dosage and ratio of the single improver is finished, and the cutter (27) on the cutter head (14) is removed, weighed, recorded, and saved for a single time. After all the experimental data, you can further adjust the type, amount or ratio of the improver, and repeat the experiment according to steps 1 to 7; Step 9: After the sample group to be tested is completed, the data of the sensor can be viewed in real time through the PC terminal, and the optimal parameters of the modifier for the specific muck sample can be selected, or the test results of different samples can be comprehensively analyzed to obtain The regular characteristics of shield tunneling parameters under different working conditions and modifiers guide engineering practice under specific working conditions.

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