Shield tunnel synchronous grouting groutability test device

Abstract

The utility model discloses a shield tunnel synchronous grouting groutability test device which comprises an air compressor, the air compressor is connected with an air cylinder through a slurry air pressure pipeline, the slurry air pressure pipeline is fixedly installed with an inlet of the air cylinder, a piston capable of sliding left and right is arranged in the air cylinder, and the piston is connected with the air cylinder. A grouting pipeline is fixedly mounted at an outlet of the air cylinder; and a pressure gauge I and a pressure gauge II are mounted on the grouting pipeline. The device combines the characteristics of synchronous grouting construction, quantitatively measures the fluidity of the slurry based on the flowing pressure difference of the slurry, not only solves the problem that the slurry with the fluidity greater than 30cm cannot be tested by a jumping table method, but also considers the friction between the slurry and the pipe wall, so that the test result is closer to the actual situation on site, and the test result is more accurate. And a test basis is provided for optimization of the fluidity of the slurry.

Description

Technical Field

[0001] The utility model relates to the technical field of test devices, in particular to a shield tunnel synchronous grouting injectability test device. Background Art

[0002] Synchronous grouting is a grouting construction technology that requires the grouting slurry to have good fluidity, so that the slurry can be evenly grouted under a reasonable grouting pressure without segregation or bleeding. In addition, the synchronous grouting technology can also ensure that the shield tail gap can be filled with slurry in a timely, uniform and dense manner, thereby improving the grouting effect. Therefore, in order to facilitate the smooth progress of the grouting operation, it is necessary to effectively reduce the probability of grouting problems such as pipe blockage and excessive pipeline pressure. Among them, the fluidity index is the key indicator to characterize the construction performance of the grouting slurry.

[0003] At present, the fluidity test method of synchronous grouting cement mortar is generally carried out in accordance with GBT2419-2005 "Method for Determination of Fluidity of Cement Mortar", that is, the test is carried out using the jumping table method. However, the flow morphology of the test slurry is quite different from the flow morphology of the slurry in the actual project, and the friction between the slurry and the pipe wall is not considered. At the same time, when the test is carried out using the jumping table method, when the fluidity of the slurry is greater than 30cm, the test cannot be carried out. Therefore, based on the characteristics of synchronous grouting construction, a test device for quantitatively testing the fluidity of synchronous grouting slurry is designed. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and a shield tunnel synchronous grouting injectability test device is proposed. It combines the construction characteristics of synchronous grouting and quantitatively measures the fluidity of the slurry based on the slurry flow pressure difference. It not only solves the problem that the jumping table method cannot test the slurry with a fluidity greater than 30cm, but also takes into account the friction between the slurry and the pipe wall. The test result is closer to the actual situation on site, which provides an experimental basis for the optimization of the slurry fluidity.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A shield tunnel synchronous grouting injectability test device comprises an air compressor, the air compressor is connected to a cylinder via a slurry air pressure pipeline, the slurry air pressure pipeline is fixedly installed with an inlet of the cylinder, a piston that can slide left and right is arranged inside the cylinder, and a grouting pipeline is fixedly installed at the outlet of the cylinder;

[0007] The grouting pipeline is installed with a pressure gauge 1 and a pressure gauge 2.

[0008] Preferably, a slurry stop valve for controlling and regulating the slurry flow is installed on the grouting pipeline.

[0009] Preferably, a pressure regulating valve is installed on the slurry air pressure pipeline for maintaining the pipeline pressure to work stably within a set range.

[0010] Preferably, the base of the cylinder is detachable and connected by threaded connection.

[0011] Preferably, the pressure gauge 1 and the pressure gauge 2 are arranged sequentially from left to right and are separated by a distance of 1 m.

[0012] Preferably, the cylinder and the base are sealed by a sealing ring.

[0013] The utility model has the following beneficial effects:

[0014] 1. The shield tunnel synchronous grouting injectability test device effectively solves the problem that the existing commonly used synchronous grouting slurry fluidity test method - the jumping table method cannot test slurry with fluidity greater than 30cm. The device ensures that the fluidity of various injectable slurries can be accurately measured and has a wide range of applications. At the same time, the device also provides a test basis for the optimization of slurry fluidity;

[0015] 2. The shield tunnel synchronous grouting injectability test device tests the fluidity of the slurry based on the front and rear pressure difference of the slurry flowing through the pipeline. Therefore, the influence of the friction between the slurry and the pipe wall on the fluidity is considered during the test process. The slurry test environment is closer to the actual construction environment. Therefore, the test results will be closer to the actual situation on site. Therefore, the device has high engineering practical value.

[0016] The utility model combines the characteristics of synchronous grouting construction and quantitatively measures the fluidity of the slurry based on the slurry flow pressure difference. It not only solves the problem that the jumping table method cannot test slurry with a fluidity greater than 30 cm, but also takes into account the friction between the slurry and the pipe wall. The test results are closer to the actual situation on site, providing an experimental basis for the optimization of slurry fluidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model provides a schematic structural diagram of a shield tunnel synchronous grouting injectability test device.

[0018] In the figure: 1 air compressor, 2 pressure regulating valve, 3 piston, 4 cylinder, 5 slurry stop valve, 6 pressure gauge 1, 7 pressure gauge 2. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] Reference Figure 1 , a shield tunnel synchronous grouting injectability test device, comprising an air compressor 1, the air compressor 1 is connected to a cylinder 4 through a slurry air pressure pipeline, the base of the cylinder 4 is detachable, convenient for pouring slurry, and is connected by a threaded connection. The cylinder 4 and the base are sealed by a sealing ring to ensure the air tightness of the cylinder 4, the slurry air pressure pipeline is installed with a pressure regulating valve 2 for maintaining the pipeline pressure within a set range, the slurry air pressure pipeline is fixedly installed with the inlet of the cylinder 4, the cylinder 4 is provided with a piston 3 that can slide left and right, and the outlet of the cylinder 4 is fixedly installed with a grouting pipeline;

[0022] Pressure gauge 1 6 and pressure gauge 2 7 are installed on the grouting pipeline. Pressure gauge 1 6 and pressure gauge 2 7 are arranged from left to right in sequence and are separated by a distance of 1m. A slurry stop valve 5 for controlling and adjusting the slurry flow is installed on the grouting pipeline and is located at the left end of pressure gauge 1 6.

[0023] Working principle:

[0024] In the test, the air compressor 1 provides air pressure to the piston 3, and the piston 3 squeezes the slurry in the cylinder 4 to flow out. The slurry passes through the pressure gauge 1 6 and the pressure gauge 2 7 in turn. The pressure gauge 1 6 tests the pressure of the inflowing slurry, and the pressure gauge 2 7 tests the pressure of the outflowing slurry.

[0025] The specific test steps are as follows:

[0026] 1. Remove the base of cylinder 4, pour the prepared slurry into cylinder 4, and close and tighten the base to ensure the airtightness of cylinder 4;

[0027] 2. After the slurry air pressure pipeline and the grouting pipeline are connected respectively, turn on the air compressor 1 and adjust the air pressure regulating valve 2 step by step so that the slurry can slowly pass through the pressure gauge 1 6 and the pressure gauge 2 7;

[0028] 3. After the readings of pressure gauge 1 6 and pressure gauge 2 7 are stable, read the readings P1 of pressure gauge 1 6 and P2 of pressure gauge 2 7. The slurry fluidity test index is characterized by the pressure difference per unit stroke, and the calculation formula is as follows:

[0029]

[0030] Where: ΔP—pressure difference per unit stroke of slurry (kPa·m -1 );

[0031] P1—Reading of pressure gauge 6 (kPa);

[0032] P2—Reading of pressure gauge 27 (kPa);

[0033] L—The distance of slurry passing through pressure gauge 1 6 and pressure gauge 2 7 (mm).

[0034] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A shield tunnel synchronous grouting injectability test device, comprising an air compressor (1), characterized in that: The air compressor (1) is connected to a cylinder (4) via a slurry air pressure pipeline, the slurry air pressure pipeline is fixedly installed at the inlet of the cylinder (4), a piston (3) that can slide left and right is arranged inside the cylinder (4), and a grouting pipeline is fixedly installed at the outlet of the cylinder (4); The grouting pipeline is installed with a pressure gauge 1 (6) and a pressure gauge 2 (7).

2. A shield tunnel synchronous grouting injectability test device according to claim 1, characterized in that: A slurry stop valve (5) for controlling and regulating the slurry flow rate is installed on the grouting pipeline.

3. A shield tunnel synchronous grouting injectability test device according to claim 1, characterized in that: The slurry gas pressure pipeline is installed with a pressure regulating valve (2) for maintaining the pipeline pressure within a set range and working stably.

4. A shield tunnel synchronous grouting injectability test device according to claim 1, characterized in that: The base of the cylinder (4) is detachable and connected by means of a threaded connection.

5. The shield tunnel synchronous grouting injectability test device according to claim 1, characterized in that: The pressure gauge 1 (6) and the pressure gauge 2 (7) are arranged in sequence from left to right and are separated by a distance of 1 m.

6. A shield tunnel synchronous grouting injectability test device according to claim 4, characterized in that: The cylinder (4) and the base are sealed by a sealing ring.

Images