Test device for simulating anti-seepage grouting of underground diaphragm wall joint of subway foundation pit
By designing a test device that simulates the underground continuous wall joints of the subway foundation pit, the problem of water leakage at the underground continuous wall joints during subway foundation pit construction is solved, and the effect of selecting economical and practical grouting water stop materials is achieved, which significantly improves the durability of the structure.
Patent Information
- Application Number
- CN202422163157.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-04
AI Technical Summary
During the construction of subway foundation pits, water leakage is prone to occur at the joints of the underground continuous walls, resulting in water seepage in the underground structure and affecting the durability of the structure. It is difficult for the existing technology to choose economical and practical grouting water stop materials in the case of small leakage.
A test device that simulates the anti-seepage grouting of the joints of the underground continuous wall of the subway foundation pit is designed, including model boxes, foundation pit soil, underground continuous wall, hydraulic simulation components, grouting components, etc. By simulating the stress situation of the underground continuous wall and the water pressure situation at the joint, suitable grouting water stop materials are selected.
The device can more realistically simulate the stress situation of the underground continuous wall and the seepage at the joints, and select economical and practical grouting water stop materials, which significantly improves the use effect of grouting liquid.
Smart Images
Figure CN223037726U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of foundation pit engineering, and particularly relates to a test device for simulating anti-seepage grouting of the joints of diaphragm walls in subway foundation pits. Background Technique
[0002] Foundation pit engineering refers to the underground space excavated for the construction of building foundations during building construction. In recent years, the development of urban underground space in China has been in full swing, and the construction scale of urban underground channels, subways, etc. has been increasing. Underground transportation has become an important part of urban public transportation. However, with the construction of various underground transportation facilities, the complexity of the underground space has gradually increased. Subway stations are often located in areas with large passenger flows in the city. If engineering accidents occur, extremely serious consequences will be caused. Therefore, the construction of subway foundation pits has extremely high requirements for safety.
[0003] The retaining structure of subway station foundation pits often adopts diaphragm walls, which have good functions of water interception, leakage prevention, load bearing and water blocking. However, due to the construction of diaphragm walls in divided slots, it is not easy to ensure the concrete pouring quality at the construction joints of the slots, and the joints of the diaphragm walls are prone to water leakage after the foundation pit is excavated, which may cause water seepage in the underground structure and affect the durability of the structure.
[0004] After leakage occurs, it is usually to control the water leakage of the diaphragm wall by injecting water-stop materials and driving water-stop piles. However, driving water-stop piles has a greater impact on the structure and the surrounding environment, and it is often selected only after a sudden gush occurs. Therefore, how to select an economical and practical grouting water-stop material when there is a small leakage at the joints of the diaphragm wall is a technical problem to be solved urgently. Content of the Utility Model
[0005] The utility model provides a test device for simulating anti-seepage grouting of the joints of diaphragm walls in subway foundation pits, aiming to solve the problems raised in the above background technique.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] An experimental device for simulating the anti-seepage grouting of the diaphragm wall joint in the subway foundation pit, including a model box and foundation pit soil, and the foundation pit soil is arranged inside the model box. A diaphragm wall is arranged at the central position inside the model box, and both sides and the bottom of the diaphragm wall are in contact with the foundation pit soil. A diaphragm wall joint is arranged on the diaphragm wall. A water pressure simulation component is arranged inside the foundation pit soil. The water pressure simulation component includes a water pressure simulation chamber and a plurality of bolts, and the water pressure simulation chamber is fixed to the diaphragm wall joint by four bolts. A water pressure monitoring hole and a water inlet hole are opened on the water pressure simulation chamber. A water inlet pipe is embedded in the water inlet hole, and one end of the water inlet pipe penetrates through the model box. A water pump is movably arranged on one side of the model box, and the output end of the water pump is fixedly connected to the water inlet pipe. A water pressure monitoring hole is opened on the water pressure simulation chamber, and water pressure sensors are fixedly installed inside the water pressure monitoring hole and on the water inlet pipe. A grouting component is arranged on the other side of the diaphragm wall.
[0008] Further, an expansion rubber strip is fixedly connected to the inner edge position of the water pressure simulation chamber.
[0009] It can be seen that in the above technical solution, the expansion rubber strip swells when it meets water and is used for water stop and sealing.
[0010] Further, the water inlet pipe is a component made of PVC material.
[0011] It can be seen that in the above technical solution, it has good chemical resistance, corrosion resistance and certain strength.
[0012] Further, the diaphragm wall joint is specifically a socket pipe joint.
[0013] Further, the grouting component includes a sleeve, a grouting pipe and a piston. The bottom end of the sleeve is inserted into the foundation pit soil. The bottom end of the grouting pipe penetrates through the sleeve and is fixedly connected to the piston, and a plurality of discharge ports are opened on one side of the sleeve close to the diaphragm wall.
[0014] Further, the top end of the sleeve is fixedly communicated with a main grouting device, and grouting liquid is arranged inside the main grouting device.
[0015] Further, a reaction frame is arranged on one side of the model box away from the water pump. Four support columns are arranged on the side of the reaction frame close to the model box, and one ends of the four support columns all penetrate through the model box and are in contact with the diaphragm wall.
[0016] It can be seen that in the above technical solution, it is convenient to extrude the diaphragm wall.
[0017] Further, an upper loading object is movably arranged on the top of the foundation pit soil, and the upper loading object is located on the side of the diaphragm wall close to the water pump.
[0018] It can be seen that in the above technical solution, it is convenient to apply pressure to the foundation pit soil mass.
[0019] The present utility model has the following advantages:
[0020] 1. By arranging a model box, a foundation pit soil mass, a diaphragm wall, a water pressure simulation component, a water pressure sensor, a water inlet pipe, a water pump, a grouting component and a grouting equipment main body, the present utility model can relatively truly simulate the stress situation of the diaphragm wall and the water seepage situation at the joint under a certain water pressure, so as to select a more economical and practical grouting water-stop material, and has a good use effect;
[0021] 2. By moving the grouting pipe upward, the present utility model can drive the piston to move in the sleeve, and the grouting liquid is discharged through one of the discharge ports. By adjusting the position of the piston in the sleeve, the grouting liquid is discharged from different discharge ports, so as to adjust the discharge height of the grouting liquid. The structure is simple and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.
[0023] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions that the present utility model can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.
[0024] Figure 1 It is a schematic diagram of the overall structure of the present utility model.
[0025] Figure 2 It is a top view of a partial structure of the present utility model.
[0026] Figure 3 It is a schematic diagram of the assembly structure of the diaphragm wall and the water pressure simulation component of the present utility model.
[0027] Figure 4 It is a partial structure sectional view of the grouting component of the present utility model.
[0028] In the figure: 1, model box; 2, foundation pit soil mass; 3, diaphragm wall; 4, water pressure simulation component; 401, water pressure simulation chamber; 402, water pressure monitoring hole; 403, water inlet hole; 404, bolt; 5, water pressure sensor; 6, water inlet pipe; 7, water pump; 8, grouting component; 801, sleeve; 802, grouting pipe; 803, piston; 804, discharge port; 9, main body of grouting equipment; 10, support column; 11, reaction frame; 12, upper load; 13, diaphragm wall joint. Specific implementation mode
[0029] The following specific embodiments illustrate the implementation modes of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.
[0030] Refer to the attached drawings of the specification Figures 1-4 , an experimental device for simulating the anti-seepage grouting of the diaphragm wall joint in a subway foundation pit, including a model box 1 and a foundation pit soil mass 2, and the foundation pit soil mass 2 is arranged inside the model box 1. A diaphragm wall 3 is arranged at the central position inside the model box 1, and both the two sides and the bottom of the diaphragm wall 3 are in contact with the foundation pit soil mass 2. A diaphragm wall joint 13 is arranged on the diaphragm wall 3. A water pressure simulation component 4 is arranged inside the foundation pit soil mass 2. The water pressure simulation component 4 includes a water pressure simulation chamber 401 and a plurality of bolts 404, and the water pressure simulation chamber 401 is fixed to the diaphragm wall joint 13 by four bolts 404. A water pressure monitoring hole 402 and a water inlet hole 403 are opened on the water pressure simulation chamber 401. A water inlet pipe 6 is embedded inside the water inlet hole 403, and one end of the water inlet pipe 6 penetrates through the model box 1. A water pump 7 is movably arranged on one side of the model box 1, and the output end of the water pump 7 is fixedly connected to the water inlet pipe 6. A water pressure monitoring hole 402 is opened on the water pressure simulation chamber 401, and water pressure sensors 5 are fixedly installed inside the water pressure monitoring hole 402 and on the water inlet pipe 6. A grouting component 8 is arranged on the other side of the diaphragm wall 3.
[0031] Furthermore, an expansion rubber strip is fixedly connected to the inner edge position of the water pressure simulation chamber 401. The expansion rubber strip expands when encountering water and is used for water stop and sealing.
[0032] Furthermore, the water inlet pipe 6 is a component made of PVC material, which has good chemical resistance, corrosion resistance and certain strength.
[0033] Furthermore, the diaphragm wall joint 13 is specifically a socket pipe joint.
[0034] Further, the grouting assembly 8 includes a sleeve 801, a grouting pipe 802 and a piston 803. The bottom end of the sleeve 801 is inserted into the foundation pit soil mass 2, the bottom end of the grouting pipe 802 penetrates through the sleeve 801 and is fixedly connected to the piston 803, and a plurality of discharge ports 804 are formed on one side of the sleeve 801 close to the diaphragm wall 3. The top end of the sleeve 801 is fixedly communicated with a main grouting device 9, and a grouting liquid is arranged inside the main grouting device 9.
[0035] Further, a reaction frame 11 is arranged on one side of the model box 1 away from the water pump 7. Four support columns 10 are arranged on one side of the reaction frame 11 close to the model box 1. One ends of the four support columns 10 all penetrate through the model box 1 and are in contact with the diaphragm wall 3. An upper loading object 12 is movably arranged on the top of the foundation pit soil mass 2, and the upper loading object 12 is located on one side of the diaphragm wall 3 close to the water pump 7.
[0036] The using process of the utility model is as follows:
[0037] Step 1. Test device construction:
[0038] (1) Construct the model box 1 and reserve holes for the water inlet pipe 6 and four support columns 10;
[0039] (2) Prepare the diaphragm wall 3 and connect the water pressure simulation chamber 401 to the diaphragm wall joint 13 through a plurality of bolts 404;
[0040] (3) Put a part of the foundation pit soil mass 2 into the model box 1, then insert the diaphragm wall 3 into the middle of the model box 1. Install one of the water pressure sensors 5 and the water inlet pipe 6 on the water pressure monitoring hole 402 and the water inlet hole 403 respectively. Insert the sleeve 801 containing the high-pressure airbag into the foundation pit soil mass 2, then fill the remaining foundation pit soil mass 2. Press the four support columns 10 against the inner side of the foundation pit of the diaphragm wall 3 between the reaction frame 11. The upper loading object 12 is pressed above the foundation pit soil mass 2. It should be noted that the reaction frame 11 is fixed to the ground;
[0041] Step 2. Waterproof performance test of the diaphragm wall joint:
[0042] (1) Install the other water pressure sensor 5 on the water inlet pipe 6, then connect the water pump 7 to make the pressurized water body fill the water pressure simulation chamber 401;
[0043] (2) Gradually increase the water pressure, keep each level of water pressure unchanged for a period of time, record whether the reading of the water pressure sensor 5 in the model box 1 is stable. When water leakage occurs, record the water pressure values inside and outside the model box 1;
[0044] (3) Use an endoscope to observe the water leakage situation and location of the diaphragm wall joint 13;
[0045] Step 3: Testing the water-stop effect of the grouting liquid
[0046] (1) Turn off the water pump 7, take out the high-pressure airbag in the sleeve 801, install the grouting pipe 802 and the piston 803, and move the piston 803 according to the observed water seepage position, so as to control the grouting position;
[0047] (2) Connect the top end of the grouting pipe 802 to the main body 9 of the grouting equipment, set the type and quantity of the grouting liquid, and inject the grouting liquid into the model box 1 through the main body 9 of the grouting equipment. After the grouting is completed, let it stand for one day;
[0048] (3) Turn on the water pump 7, increase the water pressure of the seepage and leakage recorded before, record the time required for the diaphragm wall joint 13 to leak. If there is no leakage, continue to pressurize;
[0049] (4) Replace the type and quantity of the grouting liquid, repeat the above steps, and compare the water-stop time and effect of different grouting schemes.
[0050] In summary, the utility model can more realistically simulate the stress situation of the diaphragm wall and the water seepage situation at the joint under a certain water pressure, so as to select a more economical and practical grouting water-stop material, and has a good use effect.
[0051] The content not described in detail in the specification belongs to the prior art well-known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited. Conventional equipment can be used. In this technical solution, since the electrical control components not mentioned belong to the prior art, they are not shown in the figure and will not be described here.
[0052] The above are only the preferred embodiments of the utility model and are not intended to limit the utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A test device for simulating anti-seepage grouting of underground continuous wall joints in a subway foundation pit, comprising a model box (1) and foundation pit soil (2), wherein the foundation pit soil (2) is arranged inside the model box (1), and is characterized in that: An underground continuous wall (3) is arranged at the center position of the interior of the model box (1), and both sides and the bottom of the underground continuous wall (3) are in contact with the foundation pit soil (2). A ground-connected wall joint (13) is arranged on the underground continuous wall (3). A water pressure simulation component (4) is arranged inside the foundation pit soil (2). The water pressure simulation component (4) comprises a water pressure simulation chamber (401) and a plurality of bolts (404). The water pressure simulation chamber (401) is fixed to the ground-connected wall joint (13) by four bolts (404). A water pressure simulation chamber (401) is provided with a water pressure A monitoring hole (402) and a water inlet hole (403), a water inlet pipe (6) is embedded in the water inlet hole (403), and one end of the water inlet pipe (6) passes through the model box (1), a water pump (7) is movably arranged on one side of the model box (1), and the output end of the water pump (7) is fixedly connected to the water inlet pipe (6), a water pressure monitoring hole (402) is opened on the water pressure simulation chamber (401), and a water pressure sensor (5) is fixedly installed inside the water pressure monitoring hole (402) and on the water inlet pipe (6), and a grouting assembly (8) is arranged on the other side of the underground continuous wall (3).
2. The test device for simulating anti-seepage grouting of underground continuous wall joints in a subway foundation pit as claimed in claim 1, characterized in that: An expansion rubber strip is fixedly connected to the inner edge of the water pressure simulation chamber (401).
3. The test device for simulating anti-seepage grouting of underground continuous wall joints in a subway foundation pit as claimed in claim 1, characterized in that: The water inlet pipe (6) is a PVC material component.
4. The test device for simulating anti-seepage grouting of underground continuous wall joints in a subway foundation pit as claimed in claim 1, characterized in that: The ground-to-wall joint (13) is specifically a locking pipe joint.
5. The test device for simulating anti-seepage grouting of underground continuous wall joints in a subway foundation pit as claimed in claim 1, characterized in that: The grouting assembly (8) comprises a sleeve (801), a grouting pipe (802) and a piston (803); the bottom end of the sleeve (801) is inserted into the interior of the foundation pit soil (2); the bottom end of the grouting pipe (802) passes through the sleeve (801) and is fixedly connected to the piston (803); and a plurality of discharge ports (804) are provided on one side of the sleeve (801) close to the underground continuous wall (3).
6. The test device for simulating anti-seepage grouting of underground continuous wall joints in a subway foundation pit as claimed in claim 5, characterized in that: The top end of the sleeve (801) is fixedly connected to a grouting equipment body (9), and grouting liquid is arranged inside the grouting equipment body (9).
7. The test device for simulating anti-seepage grouting of underground continuous wall joints in a subway foundation pit as claimed in claim 1, characterized in that: A reaction frame (11) is provided on the side of the model box (1) away from the water pump (7), and four support columns (10) are provided on the side of the reaction frame (11) close to the model box (1), and one end of each of the four support columns (10) passes through the model box (1) and contacts the underground continuous wall (3).
8. The test device for simulating anti-seepage grouting of underground continuous wall joints in a subway foundation pit as claimed in claim 1, characterized in that: An upper loading object (12) is movably provided on the top of the foundation pit soil body (2), and the upper loading object (12) is located on a side of the underground continuous wall (3) close to the water pump (7).