Shield tunnel synchronous grouting pressure injection test device

Abstract

The utility model discloses a shield tunnel synchronous grouting pressure-injection test device, which relates to the technical field of grouting tests, and comprises a test soil box used for filling soil to simulate a stratum; the grouting plate is arranged in the test soil box in a drawable mode, a gap used for being filled with grout can be formed in the soil body after the grouting plate is drawn out, a grouting barrel communicated with the grouting plate is arranged on the side face of the grouting plate, a frame body is arranged outside the grouting barrel, and the frame body is located on one side of the test soil box; and the monitoring system is used for monitoring parameters in the grouting process and comprises a pressure monitoring unit arranged in the test soil box and an electronic scale located at the bottom of the grouting barrel. And the real-time and accurate monitoring of the pressure change distribution of the upper soil body and the slurry pressure of the slurry outlet is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to grouting test technical field, concretely to a kind of shield tunnel synchronous grouting pressure injection test device. BACKGROUND

[0002] In the shield tunnel construction process, synchronous grouting is a crucial link, and its purpose is to fill the building gap between the shield tail and segment immediately after the shield tail is out of the shield machine, to prevent ground subsidence and control the tunnel floating. The liquidity of grouting material is a key factor affecting the grouting effect, which is directly related to whether the slurry can fully fill the gap and its pressure distribution on the ground.

[0003] Currently, consistency meter is generally used to test the liquidity of grouting material in engineering. However, this method has obvious defects: first, the test results are greatly affected by human operation, have strong randomness and poor repeatability; second, the index measured by consistency meter has no direct relationship with the actual flow resistance of slurry in grouting pipeline, and cannot reflect the pressure loss of slurry in pipeline transportation. It is this pressure loss that determines the actual pressure at the slurry outlet of the shield tail under the same grouting pump pressure, and further affects the fullness of grouting and the extrusion effect on the ground. The existing test methods often cannot monitor the slurry pressure change at key positions and the stress response of the upper soil body in the grouting process in real time, especially for the soil pressure redistribution phenomenon caused by soil arching effect during the extraction of grouting plate, and lack effective observation means.

[0004] Therefore, the utility model provides a kind of shield tunnel synchronous grouting pressure injection test device. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of shield tunnel synchronous grouting pressure injection test device to solve the problems raised in the above background technology. To achieve the above purpose, the utility model provides the following technical scheme: a kind of shield tunnel synchronous grouting pressure injection test device, including test soil box, for filling soil to simulate ground formation;Grouting plate, which is arranged in the test soil box in a pullable manner, can form a gap for filling slurry in the soil after being pulled out, the side surface of the grouting plate is provided with a grouting barrel in communication with it, the outside of the grouting barrel is provided with a frame, and the frame is located on one side of the test soil box;Monitoring system for monitoring parameters in the grouting process, including pressure monitoring unit arranged in the test soil box and electronic scale located at the bottom of the grouting barrel.

[0006] Preferably, the pressure monitoring unit is a water bag soil pressure gauge, which includes a pressure sensing water bag and an electronic pressure gauge electrically connected thereto.

[0007] Preferably, the water bag soil pressure gauge is arranged above the grouting plate, for monitoring the soil pressure change distribution of the upper soil body during the extraction of the grouting plate and the grouting process.

[0008] Preferably, the water bag soil pressure gauge is arranged at the end of the grouting plate to monitor the grout pressure of the grouting outlet in real time.

[0009] Preferably, the end of the grouting plate is provided with a connecting frame, and the side of the connecting frame is provided with a screw rod penetrating through the frame body and being threadedly connected with the frame body.

[0010] Preferably, the side of the test soil box is provided with a magnetic bar, the upper portion of the grouting plate is provided with a magnetic portion, the bottom end of the magnetic bar has a magnetic force attracting the magnetic portion, and the end of the grouting plate is coincided with the inner wall of the test soil box in the state that the bottom end of the magnetic bar is located inside the magnetic portion.

[0011] Preferably, the wall body of the grouting plate is provided with a plurality of equidistantly distributed through holes, the inside of the grouting plate is provided with a toothed strip, the protruding area of the toothed strip shields the through holes, the end of the toothed strip is provided with a connecting plate, and the side of the connecting plate is provided with an electric push rod.

[0012] The utility model at least has the following beneficial effects:

[0013] In the utility model, the actual stratum environment is simulated through the test soil box, and the pullable grouting plate structure is matched, so that the formation process of the grouting gap can be accurately controlled, and the grouting scene in the shield tunnel construction can be effectively restored. The communication design of the grouting plate and the grouting barrel is combined with the stable support of the frame body, so that the continuity and stability of the grout delivery are ensured. The monitoring system adopts the water bag soil pressure gauge as the core monitoring element, realizes the real-time and accurate monitoring on the pressure change distribution of the upper soil body and the grout pressure of the grouting outlet through the double monitoring points arranged above the grouting plate and at the end of the grouting outlet. The threaded connection design of the connecting frame and the screw rod is combined with the magnetic attraction structure of the magnetic bar and the magnetic portion, so that the stability of the pulling process of the grouting plate is ensured, and the accurate alignment of the grouting plate and the inner wall of the test soil box is realized. The combination design of the through holes of the grouting plate wall body and the toothed strip is combined with the electric push rod driving the toothed strip to move to adjust the opening degree of the through holes, so that the outflow speed and distribution range of the grout are flexibly controlled, and the flexibility and controllability of the grouting test are further improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a whole structure schematic view of the utility model;

[0015] Figure 2 It is another angle schematic view of the whole structure of the utility model;

[0016] Figure 3 It is a structure sectional view of the grouting plate and the test soil box in the utility model;

[0017] Figure 4 It is the utility model Figure 3 A region structure enlarged view in the utility model;

[0018] Figure 5 The structure of the grouting plate is shown in the sectional view of the utility model.

[0019] In the figure: 1 - test soil box; 2 - grouting plate; 3 - grouting barrel; 4 - frame; 5 - electronic scale; 6 - water bag soil pressure gauge; 7 - connecting frame; 8 - screw rod; 9 - magnetic bar; 10 - magnetic part; 11 - through hole; 12 - toothed strip; 13 - connecting plate; 14 - electric push rod. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0021] Please refer to Figures 1-5 The utility model provides a kind of technical scheme: a synchronous grouting pressure injection test device for shield tunnel, including test soil box 1, for filling soil to simulate stratum;Grouting plate 2, it is set in test soil box 1 with pullable, after its extraction, it can form a gap for filling slurry in soil, the side of grouting plate 2 is equipped with grouting barrel 3 with its mutual intercommunication, the inside of grouting plate 2 is hollow structure, staff controls slurry in grouting barrel 3 to enter grouting plate 2 by air pump, the outside of grouting barrel 3 is equipped with frame 4, grouting barrel 3 is placed in frame 4 interior and can be taken, frame 4 is located at the side of test soil box 1;

[0022] Monitoring system, for monitoring parameter in grouting process, it includes pressure monitoring unit being arranged in test soil box 1 and electronic scale 5 being located at the bottom of grouting barrel 3, the bottom of electronic scale 5 is fixedly connected with frame 4, electronic scale 5 can monitor the residual weight of slurry in grouting barrel 3 in real time, to facilitate subsequent grouting test data collection.

[0023] The end of grouting plate 2 is equipped with connecting frame 7 and is fixedly connected with it, the side of connecting frame 7 is equipped with screw rod 8 and is rotatably connected with it, screw rod 8 passes through frame 4 and is screw-connected with it, staff can make grouting plate 2 displace in test soil box 1 by rotating screw rod 8.The side of test soil box 1 is equipped with magnetic bar 9 and is slidably connected with it, the top of grouting plate 2 is equipped with magnetic part 10, the bottom end of magnetic bar 9 and magnetic part 10 have mutual attractive magnetic force, under the condition that the bottom end of magnetic bar 9 is located inside magnetic part 10, the end of grouting plate 2 coincides with the inner wall of test soil box 1,

[0024] This design ensures that the grouting plate 2 can tightly fit the inner wall of the test soil box 1 in the grouting test state, preventing the soil from occupying too much or too little space in the test soil box 1, and ensuring the accuracy of the test data. At the same time, the cooperation of the magnetic bar 9 and the magnetic part 10 also provides stability for the grouting plate 2 during the test process, avoiding the displacement of the grouting plate 2 caused by external vibration or human operation.

[0025] The wall of the grouting plate 2 is provided with a plurality of equidistantly distributed through holes 11, and the inside of the grouting plate 2 is provided with a toothed strip 12. The protruding area of the toothed strip 12 shields the through holes 11. The end of the toothed strip 12 is provided with a connecting plate 13 and is fixedly connected therewith. The side surface of the connecting plate 13 is provided with an electric push rod 14 and is fixedly connected therewith. The end of the electric push rod 14 is fixedly connected with the inner wall of the grouting plate 2. During the grouting test process, the staff can control the extension and retraction of the electric push rod 14 to drive the toothed strip 12 to move, thereby adjusting the opening degree of the through holes 11. When a larger grouting flow is needed, the electric push rod 14 is controlled to retract, so that the protruding area of the toothed strip 12 reduces the shielding of the through holes 11, allowing more grout to enter the gap between the soil. When a smaller grouting flow or fine grouting operation is needed, the electric push rod 14 is controlled to extend, increasing the shielding area of the toothed strip 12 to the through holes 11, limiting the passing amount of grout. This design makes the grouting process more flexible and controllable, and can accurately adjust the flow and range of grouting according to different test requirements and stratum conditions, improving the effect and accuracy of the grouting test. At the same time, through the pressure monitoring unit and the electronic scale 5 in the monitoring system, key parameters such as pressure change and residual weight of grout during grouting can be obtained in real time, providing strong data support for further analysis of grouting effect and optimization of grouting process.

[0026] The pressure monitoring unit is a water bag soil pressure gauge 6, which includes a pressure sensing water bag and an electronic pressure gauge electrically connected thereto.

[0027] A part of the water bag soil pressure gauge 6 is arranged above the grouting plate 2, for monitoring the soil pressure change distribution of the upper soil during the extraction of the grouting plate 2 and the grouting process. Another part of the water bag soil pressure gauge 6 is arranged at the grouting outlet position of the end of the grouting plate 2, for real-time monitoring of the grout pressure of the grouting outlet.

[0028] Working principle:

[0029] In the process of the shield tunnel synchronous grouting pressure injection test, the soil is filled into the test soil box 1 to simulate the stratum environment. Then, the grouting plate 2 is arranged in the test soil box 1 in a pullable manner, and the grouting plate 2 is ensured to be closely attached to the inner wall of the test soil box 1, so that the grouting plate 2 forms a gap for filling the slurry in the soil. In the grouting process, the worker controls the slurry in the grouting barrel 3 to enter the grouting plate 2 through the air pump, and drives the toothed strip 12 to move by controlling the extension and retraction of the electric push rod 14, so as to adjust the opening degree of the through hole 11, thereby accurately controlling the flow and range of grouting. When a larger grouting flow is required, the electric push rod 14 is controlled to retract, so as to reduce the shielding of the through hole 11 by the toothed strip 12; when a smaller grouting flow or fine grouting operation is required, the electric push rod 14 is controlled to extend, so as to increase the shielding area of the through hole 11 by the toothed strip 12.

[0030] At the same time, the monitoring system starts to work. The water bag soil pressure gauge 6 arranged in the test soil box 1 monitors the soil pressure change distribution of the upper soil in the process of pulling out the grouting plate 2 and grouting, and the slurry pressure at the slurry outlet position of the end of the grouting plate 2 in real time. The water bag soil pressure gauge 6 includes a pressure sensing water bag and an electronic pressure gauge electrically connected with the pressure sensing water bag, and can convert the pressure change into an electric signal for display and recording. The electronic scale 5 located at the bottom of the grouting barrel 3 monitors the residual weight of the slurry in the grouting barrel 3 in real time, so as to facilitate the subsequent collection of grouting test data.

[0031] Through the design, the shield tunnel synchronous grouting pressure injection test device can accurately obtain the key parameters in the grouting process in real time, and provides strong data support for analyzing the grouting effect and optimizing the grouting process. Meanwhile, the device also has the advantages of simple operation, flexible control and the like, and can meet the requirements of the grouting test under different test requirements and stratum conditions.

[0032] It should be noted that, in this text, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0033] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A shield tunnel synchronous grouting pressure injection test device, characterized in that, The utility model relates to a soil test box for simulating stratum, which comprises: a soil test box (1) for filling soil to simulate stratum; a grouting plate (2) arranged in the soil test box (1) and capable of being pulled out to form a gap in the soil for filling slurry, the grouting plate (2) being provided with grouting barrels (3) in communication with each other on the side surface thereof, the grouting barrels (3) being provided with a frame (4) on the outside thereof, and the frame (4) being arranged on one side of the soil test box (1); a monitoring system for monitoring parameters in the grouting process, which comprises a pressure monitoring unit arranged in the soil test box (1) and an electronic scale (5) arranged at the bottom of the grouting barrel (3); the soil test box (1) is provided with a magnetic bar (9) on the side surface thereof, the grouting plate (2) is provided with a magnetic part (10) above the grouting plate (2), the bottom end of the magnetic bar (9) and the magnetic part (10) have magnetic attraction to each other, and the end of the grouting plate (2) coincides with the inner wall of the soil test box (1) in the state that the bottom end of the magnetic bar (9) is located inside the magnetic part (10); the wall of the grouting plate (2) is provided with a plurality of equidistantly distributed through holes (11), the inside of the grouting plate (2) is provided with a toothed strip (12), the protruding area of the toothed strip (12) shields the through holes (11), the end of the toothed strip (12) is provided with a connecting plate (13), and the side surface of the connecting plate (13) is provided with an electric push rod (14).

2. The shield tunnel simultaneous grouting injection test device according to claim 1, characterized in that: The pressure monitoring unit is a water bag soil pressure gauge (6) comprising a pressure sensing water bag and an electronic pressure gauge electrically connected to the pressure sensing water bag.

3. The shield tunnel simultaneous grouting and jacking test device according to claim 2, characterized in that: The water bag soil pressure gauge (6) is arranged above the grouting plate (2) and used for monitoring the change in the soil pressure distribution of the upper soil during the pulling out of the grouting plate (2) and the grouting process.

4. The shield tunnel simultaneous grouting and jacking test device according to claim 2, characterized in that: The water bag soil pressure gauge (6) is arranged at the slurry outlet position of the end of the grouting plate (2) and used for monitoring the slurry pressure of the slurry outlet in real time.

5. The shield tunnel simultaneous grouting and jacking test device according to claim 2, characterized in that: The end of the grouting plate (2) is provided with a connecting frame (7), the side surface of the connecting frame (7) is provided with a screw rod (8), and the screw rod (8) penetrates through the frame (4) and is threadedly connected to the frame (4).

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