Underground diaphragm wall retaining wall mud film detection test device under unfavorable geological conditions

Abstract

The utility model provides an underground diaphragm wall retaining wall mud film detection test device under unfavorable geological conditions. The device comprises a rack; the multi-layer soil body model box is arranged at the lower part of the rack, and at least two soil body model boxes in the multi-layer soil body model box are different in soil texture; one end of the grooving simulation part is inserted into the bottom of the multi-layer soil body model box; the lifting component is arranged at the top of the rack, is connected with the grooving simulation component and is used for driving the grooving simulation component to lift; and each grouting pump is internally provided with slurry with different proportions, each layer of soil body model box is connected with one grouting pump through a grouting pipe, and the number of the grouting pumps is smaller than the number of layers of the multi-layer type soil body model box. According to the utility model, the multi-layer soil body model box and the plurality of slurry grouting pumps with different proportions are arranged, so that the quality of slurry under various unfavorable geological conditions or the quality of a mud film formed by various types of slurry and a soil body can be detected at the same time, and the film forming quality of the slurry and whether the slurry can become a screening standard of the mud film can be accurately grasped.

Description

Technical Field

[0001] The utility model relates to a testing device for detecting the quality of slurry and mud film of underground continuous wall trenching, in particular to a testing device capable of realizing rapid detection of the quality of slurry and mud film of underground continuous wall trenching under adverse geological conditions. Background Art

[0002] Underground diaphragm walls have the advantages of low vibration during construction, small footprint, high rigidity, good integrity, and adaptability to a variety of geological conditions. Therefore, they are widely used in the construction of deep foundation pits for subway tunnels. Examples include the Elbe River Tunnel No. 4 in Germany, the Slender West Lake Tunnel in Yangzhou, the Qianjiang Tunnel in Hangzhou, the Yellow River Tunnel through the middle route of the South-to-North Water Diversion Project, and the Nanjing Yangtze River Tunnel. During the trenching process for underground diaphragm walls, appropriate slurry is injected into the trench walls to balance the water and soil pressure on both sides of the trench walls and ensure the stability of the trench wall soil during the trenching process. In addition, the retaining wall slurry plays the role of retaining the wall, carrying slag, cooling, and lubricating during the underground diaphragm wall trenching process. Therefore, slurry retaining wall trenching construction has become the most important trenching method.

[0003] However, under adverse geological conditions, the slurry's wall protection performance will be significantly reduced, making it difficult for the slurry to form a dense, stable mud film with the surrounding soil, leading to accidents such as instability and collapse of the excavation trench wall. For example, in gravel formations, the soil has a high coarse particle content and high permeability, making it very easy for the slurry to filter out of the formation and difficult to form a mud film on the trench wall surface. As a result, the mud pressure is unable to withstand the soil-water pressure of the soil on both sides of the trench wall. In calcareous cemented formations, the underground continuous wall trenching time can be extended to 5 to 7 days. The mud performance gradually deteriorates over time, and even severe segregation may occur. It is difficult for the soil on both sides of the trench wall to form a film with the mud, which in turn causes the trench wall to collapse, which is extremely detrimental to the underground continuous wall trenching construction safety and the surrounding environment.

[0004] Therefore, how to carry out tests to quickly detect the quality of the mud film formed by the mud and the trench wall soil under various adverse geological conditions and various mud ratios has become an urgent problem to be solved in the construction of underground continuous walls in poor strata, and it has direct practical significance for actual tunnel projects and subway deep foundation pit projects. Utility Model Content

[0005] In order to solve the defects in the prior art, the present invention proposes a device for detecting and testing the slurry film of underground continuous wall under adverse geological conditions. The scheme is as follows:

[0006] A test device for detecting mud film of underground continuous wall protection under adverse geological conditions includes: a frame; a multi-layer soil model box, which is arranged at the lower part of the frame, and the soil quality of at least two soil model boxes in the multi-layer soil model boxes is different; a troughing simulation component, one end of the troughing simulation component is inserted into the multi-layer soil model box; a lifting component, which is arranged at the top of the frame and is connected to the troughing simulation component and is used to drive the troughing simulation component to rise and fall; a plurality of grouting pumps, each grouting pump is provided with mud of different proportions, each layer of the soil model box is connected to one of the grouting pumps through a grouting pipe, and the number of the grouting pumps is less than the number of layers of the multi-layer soil model box.

[0007] Furthermore, the soil model box is a box structure with an open top, including a bottom plate and four connected side plates, and the side plates are made of transparent material; two long slots are opened on the bottom plate located between the two layers of soil model boxes, and flexible strips are fixed on the long slots, and a straight notch is opened in the center of the flexible strip for the end of the trough simulation component to pass through.

[0008] The side panels can be made of transparent acrylic panels or transparent organic glass, and the side panels are connected to the bottom panel by gluing or bolting.

[0009] The flexible strip can be a rubber strip or a silicone strip, and the rubber strip or the silicone strip can be fixed to the bottom plate by riveting or bonding and cover the long slot.

[0010] Furthermore, the multi-layer soil model box is configured as a three-layer stacked soil model box, wherein the soil in the two adjacent soil model boxes located at the upper part is different; the grouting pumps are configured as two, wherein one grouting pump is connected to the two soil model boxes at the upper part through two grouting pipes respectively, and the other grouting pump is connected to the soil model box located at the lower part.

[0011] Furthermore, the grooving simulation component includes a connecting portion, a mounting plate, and two parallel grooving plates from top to bottom, wherein the connecting portion is connected to the mounting plate, the mounting plate is connected to the two grooving plates, and the mounting plate is vertically arranged to the grooving plates.

[0012] Furthermore, the connection between the connecting portion and the mounting plate is a threaded connection, and the connection between the mounting plate and the two slotted plates is a plug-in connection.

[0013] Furthermore, the connecting part is configured as a ring, a connecting rod extends from the bottom of the ring, an external thread is provided on the surface of the connecting rod, a threaded hole is provided on the mounting plate, the connecting rod is threadedly connected to the mounting plate, a first fixed block is welded to the lower part of the mounting plate, a groove or protrusion is provided on the first fixed block, a second fixed block is welded to the top of the grooved plate, and a protrusion or groove is provided on the second fixed block that matches the groove or protrusion of the first fixed block.

[0014] The connecting rod can also be welded and fixed to the mounting plate; the mounting plate and the first fixing block can also be connected by bolts; the grooved plate and the second fixing block can also be connected by bolts.

[0015] Furthermore, the frame includes a base, a column, and a top plate; the lifting components include an electric hoist lift and a guide bracket, the electric hoist lift is installed on the top plate, the guide bracket includes an outer column wrapped around the outside of the column, I-beams are welded between the outer columns, and a mounting plate is connected to the I-beam, and bolt holes are provided on the column and the outer column.

[0016] A positioning groove can also be provided on the base to facilitate placement of the multi-layer soil model box in a designated position.

[0017] Both the upright column and the outer column can be made of square steel, and the length of the outer column is shorter than that of the upright column.

[0018] The guide bracket plays a guiding role and is used to enable the grooving simulation component to be lifted up and down stably.

[0019] When the electric hoist is working, it drives the trough simulation components and the guide bracket to rise and fall synchronously. When they are lifted to the appropriate position, the column and the outer column are fixed by bolts, and the electric hoist is turned off to save electricity.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] The utility model provides a multi-layer soil model box and several grouting pumps with different mud ratios, and can simultaneously detect the quality of mud or mud films formed by multiple muds and soil under various adverse geological conditions, and can accurately grasp the film-forming quality of the mud and whether it can become a screening standard for mud films. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a test device according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the three-section soil model box structure of an embodiment of the present utility model.

[0024] Figure 3 This is a schematic diagram of the bottom plate structure between adjacent soil model boxes according to an embodiment of the present utility model.

[0025] Figure 4 This is a schematic structural diagram of a grooving simulation component according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic structural diagram of the connection between the mounting plate and the grooving plate according to one embodiment of the present invention.

[0027] Figure 6 This is a structural diagram of the connection between a frame and a lifting component in one embodiment of the utility model.

[0028] In the above figures:

[0029] 1. Frame; 11. Base; 12. Column; 13. Top plate; 2. Three-layer soil model box; 21. Side plate; 22. Bottom plate; 23. Flexible strip; 231. Linear notch; 3. Grooving simulation component; 31. Connecting part; 32. Mounting plate; 33. Grooving plate; 34. First fixed block; 35. Second fixed block; 4. Lifting component; 41. Electric hoist lift; 42. Guide bracket; 421. Outer cylinder; 422. I-beam; 423. Bolt hole; 5. Grouting pump; 6. Grouting pipe. DETAILED DESCRIPTION

[0030] To facilitate those skilled in the art to understand the present invention, specific implementations of the present invention are described below with reference to the accompanying drawings.

[0031] like Figure 1 As shown, the utility model proposes an underground continuous wall protection mud film detection test device under adverse geological conditions, including a frame 1, a multi-layer soil model box, a trenching simulation component 3, a lifting component 4 and a plurality of grouting pumps 5.

[0032] The specific number of layers of the multi-layer soil model box can be selected and set according to the specific unfavorable geological soil to be tested. In this embodiment, Figure 2 As shown, a three-layer soil model box 2 is used as an example. From top to bottom, the soil properties of the first and second layers of the soil model box are different. The soil model box of the third layer can be the same as or different from the first and second layers. For example, the soil model boxes of the first and third layers simulate the soil properties of water-rich sand layers, and the soil model box of the second layer simulates the soil properties of calcareous cemented strata.

[0033] Accordingly, two grouting pumps 5 are provided, each containing slurry of different proportions. For purposes of distinction, the two grouting pumps 5 are designated as the first grouting pump and the second grouting pump. The first grouting pump is connected to the first and second soil model boxes via grouting pipes 6, respectively, to test the slurry diffusion mechanism and the quality of the mud film formed under different geological strata. The second grouting pump is connected to the third soil model box via grouting pipes 6 to compare the mud film quality of the first soil model box with different proportions under the same stratum conditions.

[0034] like Figure 2 、 3As shown, specifically, the soil model box is a box structure with an open top, including a bottom plate 22 and four connected side plates 21, and the side plates 21 are transparent material plates. Two long slots are provided on the bottom plate 22 located between the two layers of soil model boxes, and a flexible strip 23 is fixedly set on the long slots. A straight notch 231 is provided in the center of the flexible strip 23 to prevent the leakage of slurry during the grouting process when one end of the trough simulation component 3 passes through. It should be noted that when the trough simulation component 3 moves upward, a small amount of mud will seep out from the straight notch 231, but the amount of seepage is small. For this test, it will not affect the test results and can be ignored.

[0035] The side panels 21 can be made of a transparent acrylic panel or transparent organic glass, and the side panels 21 are connected to the bottom panel 22 by gluing or fixing with bolts.

[0036] The flexible strip 23 can be a rubber strip or a silicone strip, which can be fixed on the bottom plate 22 by riveting or bonding and covers the long slot.

[0037] like Figure 4 As shown, the troughing simulation component 3 includes, from top to bottom, a connecting portion 31, a mounting plate 32, and two parallel troughing plates 33. The connecting portion 31 is connected to the mounting plate 32, which is connected to the two troughing plates 33. The mounting plate 32 is arranged perpendicular to the troughing plates 33. The troughing plates 33 need to be inserted into the bottom of the multi-layer soil model box.

[0038] In this embodiment, the connecting portion 31 is a collar, the bottom of the collar extends out of a connecting rod, the surface of the connecting rod is provided with an external thread, a threaded hole is provided on the mounting plate 32, the connecting rod is threadedly connected to the mounting plate 32, the lower part of the mounting plate 32 is welded with a first fixing block 34, the first fixing block 34 is provided with a groove or protrusion, the top of the grooved plate 33 is welded with a second fixing block 35, the second fixing block 35 is provided with a protrusion or groove that matches the groove or protrusion of the first fixing block 34, refer to Figure 5 .

[0039] The connecting rod can also be welded and fixed to the mounting plate 32; the mounting plate 32 and the first fixing block 34 can also be connected by bolts; the grooved plate 33 and the second fixing block 35 can also be connected by bolts.

[0040] like Figure 6 As shown, the frame 1 comprises a base 11, columns 12, crossbeams, and a top plate 13, which are fixedly connected to form a rectangular frame structure. The columns 12 are constructed from square steel, the crossbeams from channel steel, and both the top plate 13 and the base 11 are constructed from thick metal plates. To facilitate positioning of the multi-layer soil model box, positioning slots may be provided on the base 11.

[0041] The lifting component 4 includes an electric hoist lift 41 and a guide bracket 42. The electric hoist lift 41 is installed on the top plate 13, and the hook of the electric hoist lift 41 hooks the connecting part 31, thereby synchronously driving the grooving plate 33 to move upward, simulating the grooving process during construction.

[0042] The guide bracket 42 plays a guiding role, and is used to enable the grooving simulation component 3 to be stably raised and lowered.

[0043] The guide bracket 42 includes an outer column 421 wrapped around the exterior of the column 12. An I-beam 422 is welded to the outer column 421. The I-beam 422 is connected to the mounting plate 32. Bolt holes 423 are provided in both the column 12 and the outer column 421. In this embodiment, the outer column 421 is made of square steel and is shorter than the length of the column 12.

[0044] When the electric hoist lift 41 is working, it drives the trough simulation component 3 and the guide bracket 42 to rise and fall synchronously. When they are lifted to a suitable position, the column 12 and the outer column 421 are fixed by bolts, and the electric hoist lift 41 is closed, which can save electricity.

[0045] Working process of the test device:

[0046] When in use, the three-stage soil model box is placed on the base 11, and the electric hoist lift is used to drive the groove simulation component 3 to move upward to simulate the excavation of the soil. At the same time, the grouting pump 5 is turned on to inject grout into the groove of the soil model box, while digging and injecting grout. After moving to a predetermined height, the outer column 421 and the column 12 are fixed with bolts. At this time, the electric hoist lift 41 can be turned off to observe the diffusion mechanism of the mud under different soil layers, i.e., geological conditions, and the quality of the mud film obtained after contact with the soil under different mud ratios. The embodiment of the utility model can simultaneously detect the quality of the mud film formed by the mud and the soil under various adverse geological conditions, and can accurately grasp the film quality of the mud and whether it can become a screening standard for mud film.

[0047] The above-described embodiments of the present invention do not limit the scope of protection of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Underground continuous wall slurry film detection test device under adverse geological conditions, characterized by: include: Rack (1); A multi-layer soil model box is arranged at the lower part of the frame (1), wherein at least two layers of the multi-layer soil model box have different soil qualities; A troughing simulation component (3), one end of which is inserted into the bottom of the multi-layer soil model box; A lifting component (4) is arranged on the top of the frame (1) and is connected to the troughing simulation component (3), and is used to drive the troughing simulation component (3) to move up and down; A plurality of grouting pumps (5) are provided, each grouting pump (5) being provided with slurry of different proportions, each layer of the soil model box being connected to one of the grouting pumps (5) via a grouting pipe (6), and the number of the grouting pumps (5) is less than the number of layers of the multi-layer soil model box.

2. The test device according to claim 1, characterized in that The soil model box is a box structure with an open top, comprising a bottom plate (22) and four connected side plates (21), wherein the side plates (21) are transparent material plates; two long slots are provided on the bottom plate (22) between the two layers of soil model boxes, and flexible strips (23) are fixedly arranged on the long slots, and a linear notch (231) is provided in the center of the flexible strip (23) for the end of the trough simulation component (3) to pass through.

3. The test device according to claim 1, characterized in that The multi-layer soil model box is configured as a three-layer stacked soil model box, wherein the soil in the two adjacent soil model boxes at the upper portion is different; the number of grouting pumps (5) is two, wherein one grouting pump (5) is connected to the two soil model boxes at the upper portion through two grouting pipes (6), respectively, and the other grouting pump (5) is connected to the soil model box at the lower portion.

4. The test device according to claim 1, characterized in that The grooving simulation component (3) comprises, from top to bottom, a connecting portion (31), a mounting plate (32), and two parallel grooving plates (33), wherein the connecting portion (31) is connected to the mounting plate (32), the mounting plate (32) is connected to the two grooving plates (33), and the mounting plate (32) and the grooving plates (33) are arranged perpendicularly.

5. The test device according to claim 4, characterized in that The connection mode between the connecting portion (31) and the mounting plate (32) is a threaded connection, and the connection mode between the mounting plate (32) and the two grooved plates (33) is a plug-in connection.

6. The test device according to claim 5, characterized in that The connecting portion (31) is configured as a collar, a connecting rod extending from the bottom of the collar, an external thread being provided on the surface of the connecting rod, a threaded hole being provided on the mounting plate (32), the connecting rod being threadedly connected to the mounting plate (32), a first fixing block (34) being welded to the lower portion of the mounting plate (32), a groove or a protrusion being provided on the first fixing block (34), a second fixing block (35) being welded to the upper portion of the grooved plate (33), a protrusion or a groove being provided on the second fixing block (35) being matched with the groove or protrusion of the first fixing block (34).

7. The test device according to claim 4, characterized in that The frame (1) includes a base (11), a column (12) and a top plate (13); the lifting component (4) includes an electric hoist lift (41) and a guide bracket (42), wherein the electric hoist lift (41) is installed on the top plate (13); the guide bracket (42) includes an outer column (421) wrapped around the outside of the column (12); an I-beam (422) is welded between the outer columns (421); the I-beam (422) is connected to the mounting plate (32), and bolt holes (423) are provided on both the column (12) and the outer column (421).

Images