Testing device for simulating influence of controllable rainfall on foundation pit

Abstract

The utility model relates to a test device for simulating the influence of controllable rainfall on a foundation pit. The test device comprises a foundation pit model box body device (1), a filling soil body (2), a row type rainfall pipeline (3), a spraying shower head (4) and a rainfall controller (5), the foundation pit model box body device (1) is a cuboid box body with an upward opening, and the interior of the foundation pit model box body device (1) is filled with the soil body (2). And the row type rainfall pipeline (3), the spraying shower head (4) and the rainfall controller (5) are positioned at the upper part of the box body device to jointly form a rainfall system. The device provided by the utility model can simulate the influence of rainfall on the foundation pit, can control rainfall with different intensities through the rainfall controller while ensuring uniform rainfall, and can eliminate the scouring of initial water pressure brought by the nozzle on the surface soil body of the model.

Description

Technical Field

[0001] The utility model belongs to the field of urban building foundation pits, and particularly relates to a test device for simulating the influence of controllable rainfall on a foundation pit. Background Art

[0002] Foundation pits are a common, comprehensive system engineering process used in the construction of high-rise buildings, subway stations, and bridges. Simple foundation pit construction has existed since ancient times, primarily involving simple timber pile enclosures and slope reduction. Since the 20th century, a large number of underground engineering projects have emerged around the world, bringing with them an increasing number of challenges and placing increasingly stringent demands on foundation pit engineering.

[0003] At present, the scale of infrastructure construction in my country is getting larger and larger, and foundation pit projects are developing towards super-large and super-deep directions. At the same time, the geological and environmental conditions are more complex, and the requirements for deformation control are more stringent. The safety issues of foundation pits are becoming more prominent and urgent. Accurate and stable analysis and the use of correct support methods and construction techniques are crucial to the success of foundation pit projects.

[0004] The instability of foundation pits is often closely linked to rainfall. Therefore, a test device that simulates the effects of controlled rainfall on foundation pits is needed to study the impact of different rainfall conditions on foundation pit stability. Currently available physical test models for foundation pits cannot accurately control rainfall intensity and also ignore the impact of the initial water pressure applied by the sprinklers on the surface soil of the foundation pit. Summary of the Invention

[0005] The purpose of this utility model is to provide a test device that simulates the effects of controlled rainfall on foundation pits, thereby simulating the effects of different rainfall conditions on building foundation pits. This device addresses the problems of existing foundation pit physical test model devices by enabling controlled rainfall and eliminating the influence of initial water pressure from sprinklers.

[0006] To achieve the above purpose, a test device for simulating the influence of controlled rainfall on foundation pit is provided, comprising:

[0007] Test box: The foundation pit model box device (1) and the filling soil (2) are used to build a proportionally reduced foundation pit model, and the row-type rainfall pipes (3) and the spray showers (4) are located above the box device to simulate rainfall.

[0008] Rainfall controller (5): The rainfall controller (5) is composed of a timer (6), a water-blocking steel plate (7) and an injection pressure hole (8). The time value of rainfall is input into the timer (6), and the timer (6) can control the opening and closing degree and time of the water-blocking steel plate (7), thereby controlling the rainfall time in the device; at the same time, an external water pump is connected through the injection pressure hole (8) to provide the device with the required water pressure.

[0009] Using the above-mentioned test device for simulating the effect of controlled rainfall on foundation pits, the test method includes the following steps:

[0010] S1: Determine the foundation pit model;

[0011] S2: Simulated rainfall.

[0012] Furthermore, the step S1 specifically includes:

[0013] a. Reduce the foundation pit in proportion according to engineering examples;

[0014] b. Fill, compact, and excavate the device, and assemble the device according to rainfall requirements.

[0015] Furthermore, the step S2 specifically includes:

[0016] a. Determine rainfall parameters based on rainfall conditions at the foundation pit location;

[0017] b. Input and control the rainfall time and rainfall intensity through the rainfall controller to start simulating rainfall.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The water outlet of the spray shower (4) is facing away from the interior of the box, that is, spraying water upwards, so as to eliminate the scouring effect of the initial water pressure brought by the nozzle on the surface soil of the model.

[0020] 2. Using parallel rainfall pipes (3) can achieve uniform rainfall.

[0021] 3. The rainfall controller (5) can accurately control the rainfall time and adjust the water pressure and rainfall amount according to demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the specific implementation methods or device descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a structural diagram of the device of the present utility model;

[0024] Figure 2 This is a schematic diagram of a row-type rainfall pipe;

[0025] Figure 3 Schematic diagram of the rain gauge controller. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the accompanying drawings.

[0027] As attached Figure 1 , attached Figure 2 , attached Figure 3 A test device for simulating the influence of controllable rainfall on a foundation pit, the device comprising a foundation pit model box device (1), a filling soil (2), a row-type rainfall pipe (3), a spray shower (4), and a rainfall controller (5); the foundation pit model box device (1) is a rectangular box with an upward opening, and the interior of the box is filled with the filling soil (2); the row-type rainfall pipe (3), the spray shower (4), and the rainfall controller (5) are located on the upper part of the box device, and together constitute a rainfall system.

[0028] As attached Figure 1 The foundation pit model box device (1) is a rectangular box with an opening facing upward, and a steel bar is welded at the bottom to increase the strength of the box. The filling soil (2) is located inside the box. Above the box are row-type rainfall pipes (3) and spray showers (4), and the rainfall controller is located outside the box device.

[0029] As attached Figure 2 The spray showers (4) are evenly distributed on the row-type rainfall pipes (3), with the spray openings facing upwards and the right side connected to the rainfall controller (5) through the water inlet pipe.

[0030] As attached Figure 3 The rainfall controller (5) is composed of a timer (6), a water-blocking steel plate (7) and an injection pressure hole (8). The rainfall time value is input into the timer (6), and the timer (6) can control the opening and closing degree and time of the water-blocking steel plate (7), thereby controlling the rainfall time in the device; at the same time, an external water pump is connected through the injection pressure hole (8) to provide the device with the required water pressure.

[0031] After the foundation pit is filled, compacted, excavated and the relevant rainfall parameters are determined, rainfall simulation can be started to study the impact of different rainfall conditions on the building foundation pit.

Claims

1. A test device for simulating the effect of controlled rainfall on foundation pits, characterized in that: include: The foundation pit model box device (1), filling soil (2), row-type rainfall pipes (3), spray showers (4), and a rainfall controller (5); the foundation pit model box device (1) is a rectangular box with an upward opening, the interior of which is filled with filling soil (2), and a foundation pit space is reserved; the row-type rainfall pipes (3), spray showers (4), and the rainfall controller (5) are located on the upper part of the box device, and together constitute a rainfall system.

2. The test device for simulating the effect of controlled rainfall on a foundation pit according to claim 1, characterized in that: The row-type rainfall pipe (3) is located at the top of the box device, and spray showers (4) are evenly distributed along the pipe. At the same time, the water outlet of the spray shower (4) faces away from the inside of the box, that is, sprays water upward, so as to eliminate the scouring effect of the initial water pressure brought by the sprinkler head on the surface soil of the model.

3. The test device for simulating the effect of controlled rainfall on a foundation pit according to claim 1, characterized in that: The rainfall controller (5) is composed of a timer (6), a water-blocking steel plate (7) and an injection pressure hole (8). By inputting the rainfall time value into the timer (6), the timer (6) can control the opening and closing degree and time of the water-blocking steel plate (7), thereby controlling the rainfall time in the device; at the same time, an external water pump is connected through the injection pressure hole (8) to provide the device with the required water pressure.

Images