CN202092933U - Earth pressure cabin model device for earth improvement test in earth pressure balance shield construction - Google Patents

Abstract

The utility model relates to an earth pressure cabin model device for an earth improvement test in earth pressure balance shield construction. The earth pressure cabin model device comprises an earth cabin and a spiral earth remover, wherein the earth cabin is a sealed container with the upper part opened, an earth cabin lid is arranged at the upper opening, earth sample is pressurized through a lifting jack, and a stirring rod is arranged in the earth cabin; and the spiral earth remover is connected to the bottom of the earth cabin and can remove earth in the earth cabin, the inclined angle of the earth remover varies within 20DEG-40DEG, and an earth remover port is formed at the upper part of the earth remover. The earth pressure cabin model device can simulate the true condition in the earth cabin during shield tunneling, and monitor the variation of earth pressure in both the earth cabin and the spiral earth remover, as well as the torque of the spiral earth remover in the test process, so as to comprehensively evaluate the performance of improved earth; the inclined angle of the spiral earth remover is changed for surveying the influence on the earth pressure in a shield machine caused by the spiral earth remover; and the earth removing quantity of the spiral earth remover can be measured conveniently for surveying the earth removing efficiency of the spiral earth remover, so as to provide reference for the optimization of shield construction parameters.

Description

An earth ballast cabin model device for earth pressure balance shield construction soil improvement test

technical field

The utility model relates to a soil ballast model test device for an earth pressure balance shield construction soil improvement test. The device can simulate the construction process of an earth pressure balance shield and evaluate the force transmission performance, permeability and fluidity of soil samples. It is suitable for the research and application of the improved soil performance evaluation test in the construction of the earth pressure balance shield machine, and belongs to the simulated tunnel excavation test mechanical device.

Background technique

Earth pressure balance shield construction is a construction method of underground excavation. The construction process is as follows: the soil in front of the shield is excavated by the cutter head and enters the soil cabin, and the muck in the soil cabin is fully mixed to meet the needs of shield tunneling construction. In the state of plastic fluidity, a pressure gradient is formed in the screw earthmover to maintain the pressure of the soil chamber, and it can be discharged smoothly to realize continuous excavation. It can be seen that the performance of the soil inside the shield machine plays a decisive role in its smooth and efficient construction. However, as the scope of soil layers for shield tunneling construction continues to expand, the excavated soil layers often fail to meet the requirements of shield tunneling construction. The plastic fluidity of the soil has caused many construction problems. Moreover, the improvement of soil during on-site construction is determined by on-site exploration or engineering experience, and there is no corresponding evaluation method for the performance of improved soil. Model test is recognized as a test method that can comprehensively evaluate the performance of improved soil. Existing model tests can simulate the shield construction process, and simply reflect the state changes of the improved soil, such as the soil pressure of the improved soil in the screw mover, the shear strength, and the change law of the screw mover torque. However, there are few studies on the pressure distribution and pressure transfer of the soil in the soil chamber, and the real situation of the soil in the soil chamber in shield tunneling cannot be simulated well. The local ballast model device can simulate the shield construction process, and better reflect the state changes of soil samples during shield construction, such as the stirring of the soil in the soil chamber, and the study of soil pressure changes in the improved soil in the soil chamber and the screw dumper Law; compare the soil improvement effects of different additives, comprehensively evaluate the performance of the improved soil, and provide a basis for optimizing the ratio of additives. It is a relatively reliable indoor test device for evaluating the performance of the improved soil. Also do not see the experimental device that has patent report and can realize this function at present.

Utility model content

The utility model proposes a soil ballast model test for an earth pressure balance shield construction soil improvement test, and the device mainly includes a soil cabin system and a spiral soil removal device system. This device can simulate shield tunneling construction. By changing the inclination angle of the screw earthmover and related operating parameters, it can study the change process of the pressure state of the improved soil in the shield machine and the torque of the screw earthmover, comprehensively evaluate the performance of the improved soil, and optimize the soil quality. The overall improved additive ratio scheme improves the construction of the shield machine in poor soil layers.

In order to achieve the above object, the utility model adopts the following technical solutions.

A soil ballast model device for earth pressure balance shield construction soil improvement test, characterized in that the device includes a soil tank, a soil tank cover, a soil tank jack, a stirring rod, a stirring motor, a soil tank bracket, a concrete base, Screw soil mover, screw soil mover motor, screw rotating device, screw soil mover support jack, sensor; of which:

The soil cabin 5 is a closed container with an upper opening, and the bottom is fixed on the concrete base 7; the support 1 above the soil cabin is provided with a beam, and the center of the beam is installed with a soil cabin jack 2 that expands vertically downwards, and the jack is connected to the soil hatch cover 3. There is a sealing water-stop strip around the hatch; the inside of the soil cabin 5 is provided with a stirring rod 4, and the stirring rod 4 is fixed on a fixed plate 17, and the fixed plate 17 is close to the inner wall of the soil cabin 5, crosses the inside of the soil cabin 5, and The transmission shaft 15 is connected to the stirring motor 6 outside the soil cabin 5; the lower part of one side of the soil cabin 5 is connected to the screw soil removal device 8 through the screw soil removal device rotating device 9; The outer rotating spherical shell 21 and the flange 19 are composed; the inner rotating spherical shell 22 forms an integral structure with the outer rotating spherical shell 19 through stainless steel balls 20; Be fixed on the soil cabin 5 by flange 19; screw rod 14 is arranged inside the screw soil remover 8, and is provided with a soil discharge port 12 near the end of the screw soil remover 8, and the end of the screw rod 14 is connected to the screw soil remover motor 11, and the screw soil remover 8 and The screw mover motor 11 is connected together, the screw mover 8 and the screw mover motor 11 are fixed on the screw mover support 13 through the screw mover support jack 10;

The sensor includes an earth pressure sensor, a displacement sensor 32 and a torque sensor 37; one end of the displacement sensor 32 is fixed on the upper surface of the soil hatch 3, and the other end is fixed on the support 1; No less than 4 soil bulkhead earth pressure sensors 34 are arranged at equal intervals on the bulkhead, soil hopper bottom plate earth pressure sensors 36 are arranged at the center of the soil hopper bottom plate, and no less than 3 earth mover earth pressure sensors 35 are arranged at equal intervals on the screw earthmover 8 ; Torque sensor 37 is set at the end of screw earthmover 8 .

The utility model has the following advantages:

The utility model can simulate the real situation of the soil in the soil cabin during shield excavation, monitor in detail the pressure state change process of the soil cabin and the soil sample in the spiral soil removal device during the excavation process, and comprehensively evaluate the performance of the improved soil; by changing the spiral soil removal device The inclination angle is used to study its influence on the earth pressure in the shield machine; it is convenient to measure the excavation volume of the screw earthmover, and to study the excavation efficiency of the spiral earthmover for soil samples, so as to provide reference for optimizing the construction parameters of the shield tunneling machine.

Description of drawings

Fig. 1 is the structural representation of the soil ballast model device of a kind of earth pressure balance shield construction soil improvement test of the utility model;

Fig. 2 is the schematic diagram of the soil tank stirring device in the utility model;

Fig. 3 is the schematic diagram of the rotation device of the spiral earthmover in the utility model;

Fig. 4 is the structural representation of spiral earthmover in the utility model;

Fig. 5 is a structural schematic diagram of the transmission device of the screw earthmover in the utility model;

Fig. 6 is a distribution diagram of sensors in the utility model.

In the figure: 1. Soil tank support, 2. Soil tank jack, 3. Soil tank cover, 4. Stirring rod, 5. Soil tank, 6. Stirring motor, 7. Concrete base, 8. Spiral soil remover, 9. Spiral Earthmover rotating device, 10, screw earthmover support jack, 11, screw earthmover motor, 12, soil discharge port, 13, screw earthmover support, 14, screw rod, 15, drive shaft, 16, bolt, 17, Circular fixed plate, 18, pulley sealing device, 19, flange, 20, stainless steel ball, 21, outer rotating spherical shell, 22, inner rotating spherical shell, 23, bolt hole, 24, inner shaft of screw earth mover, 25, Spiral soil mover outer cylinder, 26, screw blade, 27, bolt, 28, screw excavator fixing device, 29, pulley sealing device, 30, steel pipe, 31, transmission shaft, 32, displacement gauge, 33, soil pressure of soil hatch cover Pressure gauge, 34, soil bulkhead earth pressure manometer, 35, screw soil mover earth pressure sensor, 36 soil bilge bottom plate earth pressure sensor, 37, torque sensor.

Detailed ways

Below in conjunction with accompanying drawing 1～Fig. 6 the utility model is described in further detail.

As shown in Figure 1, the soil tank 5 is a cuboid container with an upper opening, which has good sealing performance and can withstand a pressure of 0.3Mpa, and the bottom is fixed on the concrete base 7. Supports 1 are provided on both sides of the soil cabin 5, and a beam is arranged on the bracket 1 above the soil cabin 5, and a soil cabin jack 2 that expands vertically downwards is installed in the center of the beam. There is a sealing water-stop strip, the soil cabin jack 2 pressurizes the soil sample in the soil cabin 5 through the soil hatch cover 3, and the stroke of the soil cabin jack 2 can reach 800mm. The inside of the soil cabin 5 is provided with a stirring rod 4, the stirring rod 4 traverses the inside of the soil cabin 5, the stirring rod 4 is connected to the stirring motor 6 outside the soil cabin 5; the lower part of the soil cabin 5 has a circular opening, and the opening is connected to the spiral row The soil implement rotating device 9, the screw earth moving device rotating device 9 internally connects the screw soil removing device 8, and the inside of the screw soil removing device 8 is a screw rod 14, and the gap between the outer diameter of the screw rod 14 and the soil removing device 8 is about 5 mm, and is arranged near the end of the screw soil removing device 8. There is a circular soil discharge opening 12 with a diameter of 160mm. The end of the screw rod 14 is connected to the screw soil removal motor 11. The screw soil removal device 8 and the motor are connected together and fixed on the screw soil removal device support 13 through the screw soil removal device support jack 10. The inclination angle of the screw soil mover 8 can be changed by lifting the jack 10 of the screw soil mover support.

As shown in FIG. 2 , the soil tank stirring device is composed of a fixed plate 17 , a transmission shaft 15 and a stirring motor 6 . The stirring rod 4 is fixed on the fixed plate 17 with bolts, the transmission shaft 15 is fixed at the center of the plate 17 with bolts 16, the fixed plate 17 is close to the inner wall of the soil cabin 5, and the fixed plate 17 is stirred by the transmission shaft 15 and the outside of the soil cabin 5 The motor 6 is connected, and the transmission shaft 15 passes through the soil bulkhead and is provided with a pulley sealing device 18 .

As shown in FIG. 3 , the screw soil mover rotating device 9 is composed of a stainless steel ball 20 , an inner rotating spherical shell 22 , an outer rotating spherical shell 21 and a flange 19 . The inner rotating spherical shell 22 forms an integral structure with the outer rotating spherical shell 19 through stainless steel balls 20, and the inclination angle of the screw earthmover 8 can be changed by the rotation of the steel ball 20 between the inner rotating spherical shell 22 and the outer rotating spherical shell 21. . The inner rotating spherical shell 22 is connected with the starting end of the screw earthmover 8 , and the outer rotating spherical shell 21 fixes the screw earthmoving device 8 on the soil cabin 5 through the flange 19 .

As shown in FIG. 4 , the screw soil mover 8 is composed of a screw soil mover outer cylinder 25 , a screw rod 14 and a soil discharge port 12 . The outer cylinder 25 is a cylinder with a thickness of 10 mm, and the inside is a screw 14 parallel to the outer cylinder 25, and the gap between the outer cylinder 25 and the outer cylinder 25 is about 5 mm. Screw rod 14 is made up of screw rod inner shaft 24 and blade 25, and blade 25 is the steel plate that width is 40mm, and thickness is 10mm, and spiral welding is on the screw rod inner shaft 24. Near the end of the outer cylinder 25 there is an opening 12 with a diameter of 160mm, and there are two adjacent bolt holes 23 at the end of the inner shaft.

As shown in FIG. 5 , the screw earthmover transmission device is composed of bolt 27 , screw earthmover fixing device 28 , pulley sealing device 29 , steel pipe 30 , transmission shaft 31 and screw earthmover motor 11 . The screw excavator fixing device 28 is a cylinder with a central opening, and the diameter is the same as the diameter of the outer cylinder 25 and is fixed on the outer cylinder 25. The center of the screw excavator fixing device 28 passes through a steel pipe 30, and is sealed by a pulley sealing device 29. The steel pipe 30 The diameter is the same as the inner diameter of the inner shaft 24 of the screw earth mover. The left end of the steel pipe 30 goes deep into the inner shaft 24 for a certain distance and is fixed with the bolt 27. The other end of the steel pipe 30 is connected with the drive shaft 31 of the motor.

As shown in Figure 6, the sensors include earth pressure sensors, displacement sensors and torque sensors on the soil hatch cover, soil bulkhead, soil tank bottom plate and screw earth mover. One end of the displacement sensor 32 is fixed on the upper surface of the soil hatch cover 3, and the other end is fixed on the support 1, and the measuring range is 1000mm. The soil hatch cover soil pressure sensor 33 is arranged in the middle of the soil hatch 3 to measure the soil pressure on the upper part of the soil cabin 5, and no less than 4 soil bulkhead soil pressure sensors 34 are arranged at equal intervals on the soil bulkhead to measure the change of the soil pressure. Set soil tank bottom plate earth pressure sensors 36, and install no less than three soil mover earth pressure sensors 35 at equal intervals on the screw earth mover 8 to measure changes in earth pressure. %. A torque sensor 37 is arranged at the bottom of the screw earth mover 8 to measure the rotating speed and torque of the screw earth mover.

When in use, the operation steps are as follows: prepare a soil sample of about ^0.3m3 , raise the soil hatch cover 3, put the soil sample into the soil compartment 5, fill the soil compartment 5 with the soil sample, and start the soil compartment jack 2 pairs Pressurize the soil to the set pressure; start the stirring motor 6, rotate the stirring rod 4 in the soil cabin 5, set the rotational angular velocity to 5 rev/min, simulate the rotation of the cutter head, and fully stir the soil in the soil cabin 5; start the spiral row Earthen tool support jack 10, adjust the inclination angle of the screw soil remover 8; open the screw soil remover opening 12, start the screw soil remover motor 11, set the speed of the screw soil remover 8, and keep the soil cabin jack pressure 2 constant during the soil removal process , when the range of the soil cabin jack 2 reaches 600mm, close the screw earth mover motor 11, and clean up the muck in the soil cabin 5 and the screw earth mover 8.

Claims (1)

1. the soil pressure cabin model equipment of a soil body improvement test in construction of soil pressure balance shield, it is characterized in that: this device comprises native cabin, native hatchcover, native cabin lifting jack, stirring rod, stirring motor, native cabin support, concrete bed, spiral dumper, spiral dumper motor, helical rotation device, spiral dumper bearing lifting jack, sensor; Wherein:

Soil cabin (5) is the closed container of a upper opening, and the bottom is fixed on the concrete bed (7); The support (1) of top, soil cabin is established a crossbeam, and flexible vertically downward native cabin lifting jack (2) is installed at the crossbeam center, and lifting jack connects native hatchcover (3), has the hermetic seal bar around the native hatchcover; Inside, soil cabin (5) is provided with stirring rod (4), stirring rod (4) is fixed on the fixed head (17), fixed head (17) is close to the inwall of native cabin (5), crosses the inside of native cabin (5), and links to each other by the outside stirring motor (6) in transmission shaft (15) and native cabin (5); Soil cabin (5) one side lower parts connect spiral dumper (8) by spiral dumper wheelwork (9); Spiral dumper wheelwork (9) by steel ball (20), interior rotation spherical shell (22), rotate spherical shell (21) outward, flange (19) is formed; The interior spherical shell (22) that rotates constitutes an one-piece construction by stainless steel ball (20) and outer rotation spherical shell (19); The interior spherical shell (22) that rotates is connected with spiral dumper (8) initiating terminal, rotates spherical shell (21) outward and is fixed on the native cabin (5) by flange (19); Spiral dumper (8) inside is screw rod (14), terminal below near spiral dumper (8) is provided with soil-discharging port (12), the terminal spiral dumper motor (11) that connects of screw rod (14), spiral dumper (8) and spiral dumper motor (11) link together, and spiral dumper (8) and spiral dumper motor (11) are fixed on the spiral dumper bearing (13) by spiral dumper bearing lifting jack (10);

Sensor comprises soil pressure sensor, displacement transducer (32) and torque sensor (37); Displacement transducer (32) one ends are fixed on native hatchcover (3) upper surface, and the other end is fixed on the support (1); Native hatchcover soil pressure sensor (33) is set in the middle of the soil hatchcover (3), the setting of soil bulkhead equal intervals is no less than 4 native bulkhead soil pressure sensors (34), soil Ceiling center is provided with native Ceiling soil pressure sensor (36), and spiral dumper (8) equal intervals setting is no less than 3 dumper soil pressure sensors (35); Spiral dumper (8) end is provided with torque sensor (37).

Images