A test device for pre-soaking settlement observation in loess areas

Abstract

The utility model discloses a test device of loess area pre -soaking water settlement observation, include: spliced measuring rod, spliced measuring rod is provided with several groups, and several groups spliced measuring rod are sequentially spliced and form long pole through connecting component, and be provided with sealing element between adjacent spliced measuring rod, isolation pipe cover, isolation pipe cover is vertically inserted in the default hole of monitoring point, and is fixed through sandstone, and spliced measuring rod is inserted in isolation pipe cover, and is provided with interval between the inner wall of isolation pipe cover and spliced measuring rod outer wall, monitoring mechanism, and monitoring mechanism includes support frame and level, and level is installed at support frame top, wherein, be provided with scale line on spliced measuring rod. The utility model improves the stability, the leakproofness, the corrosion resistance and the observation accuracy of loess area pre -soaking water settlement observation's test device, can better satisfy the engineering demand.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering monitoring technology, and in particular to a test device for observing pre-immersion settlement in loess areas. Background Technology

[0002] Large-scale engineering projects in loess regions (especially collapsible loess regions) often face complex engineering geological conditions. As a commonly used foundation type, the accuracy of the design and construction parameters of bored piles directly affects the safety and economy of the project. However, due to the special properties of collapsible loess, such as its self-weight collapsibility and uneven settlement, traditional design and construction methods often struggle to accurately obtain relevant parameters, such as the characteristic values ​​and control indicators of the vertical, horizontal, and tensile bearing capacity of a single pile.

[0003] Existing technologies for monitoring pre-immersion settlement in pile foundation engineering in collapsible loess areas mainly include two methods: one is surface settlement monitoring (shallow marker method), which is mainly used to monitor the total settlement of the surface or shallow soil. The observation range is generally limited to the deformation of shallow soil within 1.5 meters, and it cannot measure the layered collapsibility of deeper soil. The other is the layered settlement method (deep marker method), which involves burying settlement markers (such as magnetic rings) at different depths in the borehole and measuring the compression of each soil layer using a settlement meter or inclinometer. Although it can monitor deep layers, it has drawbacks such as high cost, susceptibility to groundwater corrosion, poor adaptability to field environments, and difficulty in calibration after installation. In addition, traditional monitoring devices are in direct contact with the surrounding soil, and friction interference leads to a deep settlement data transmission efficiency of less than 30%, resulting in serious distortion. Under special conditions of immersion testing (such as large-scale soil softening and disturbance during the construction of seepage holes), existing technologies face problems such as instability of the reference system and high risk of borehole wall collapse. These bottlenecks together result in a lack of deep stratified settlement data in collapsible loess areas, which restricts the accuracy of pile foundation bearing capacity design and engineering safety.

[0004] Based on the above-mentioned technical problems, this utility model provides an experimental device for observing pre-immersion water settlement in loess areas. Utility Model Content

[0005] The purpose of this invention is to provide an experimental device for observing pre-immersion settlement in loess areas, in order to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides an experimental device for observing pre-immersion water settlement in loess areas, comprising:

[0007] A modular measuring rod is provided, wherein several groups of modular measuring rods are provided, and the several groups of modular measuring rods are sequentially spliced ​​together by connecting components to form a long rod, and a sealing element is provided between adjacent modular measuring rods;

[0008] An isolation sleeve is vertically inserted into a pre-set hole at the monitoring point and fixed with sand and gravel. A long rod is inserted into the isolation sleeve, and a gap is provided between the inner wall of the isolation sleeve and the outer wall of the spliced ​​measuring rod.

[0009] The monitoring mechanism includes a support frame and a level instrument, the level instrument is installed on the top of the support frame, and the level instrument is arranged correspondingly to the spliced ​​measuring rod;

[0010] The spliced ​​measuring rod is equipped with scale lines.

[0011] According to the experimental device for pre-immersion water settlement observation in loess areas provided by this utility model, the connecting component includes a connecting rod, with threaded rods fixed at both ends of the connecting rod. The two ends of the spliced ​​measuring rod are respectively provided with mounting grooves, which are coaxially arranged with the spliced ​​measuring rod. A threaded hole is provided at the center of the mounting groove, and the threaded rods at both ends of the connecting rod are respectively threaded into the threaded grooves of the adjacent spliced ​​measuring rods.

[0012] According to the experimental device for pre-immersion water settlement observation in loess areas provided by this utility model, the spiral directions of the threaded grooves on adjacent spliced ​​measuring rods are opposite.

[0013] According to the experimental device for pre-immersion water settlement observation in loess areas provided by this utility model, the sealing element includes a sealing gasket, the sealing gasket has a through hole in the center, the sealing gasket is disposed between adjacent spliced ​​measuring rods, and abuts against the end of the spliced ​​measuring rod.

[0014] According to the experimental device for pre-immersion water settlement observation in loess areas provided by this utility model, the outer wall of the spliced ​​measuring rod is coated with an anti-rust layer.

[0015] According to the experimental device for pre-immersion water settlement observation in loess areas provided by this utility model, the length of the long rod formed by splicing several spliced ​​measuring rods is a, and the distance between the bottom of the preset hole of the monitoring point and the ground is b, where 2m≥ab≥1.5m.

[0016] The present invention discloses the following technical effects:

[0017] 1) By setting up spliced ​​measuring rods and scale lines, the settlement of the soil can be accurately observed, which improves the accuracy and reliability of the observation.

[0018] 2) The isolation sleeve effectively protects the spliced ​​measuring rod, avoids direct contact between it and the soil, reduces soil corrosion and wear on the measuring rod, and extends the service life of the device.

[0019] 3) The device can be adjusted and optimized according to different engineering geological conditions and test requirements, and has strong adaptability and flexibility.

[0020] 4) By accurately observing the settlement of the soil, accurate parameters and control indicators are provided for the design and construction of bored piles, which helps to improve the safety and economy of the project. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the experimental device for observing pre-immersion water settlement in loess areas according to this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the connecting component of this utility model.

[0024] The components include: 1. Spliced ​​measuring rod; 2. Isolation sleeve; 3. Support frame; 4. Level instrument; 5. Scale lines; 6. Connecting rod; 7. Sealing gasket. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figure 1-2 This utility model provides an experimental device for observing pre-immersion water settlement in loess areas, comprising:

[0028] The splicing measuring rod 1 is provided in several groups. The several groups of splicing measuring rods 1 are sequentially spliced ​​together by connecting components to form a long rod. A sealing element is provided between adjacent splicing measuring rods 1.

[0029] Isolation sleeve 2 is vertically inserted into the preset hole of the monitoring point and fixed with sand and gravel. The spliced ​​measuring rod 1 is inserted into the isolation sleeve 2, and there is a gap between the inner wall of the isolation sleeve 2 and the outer wall of the spliced ​​measuring rod 1.

[0030] The monitoring mechanism includes a support frame 3 and a level 4. The level 4 is installed on the top of the support frame 3 and is arranged correspondingly to the spliced ​​measuring rod 1.

[0031] Among them, the spliced ​​measuring rod 1 is equipped with scale lines 5.

[0032] When this utility model is in operation,

[0033] Monitoring points are set up, radiating outwards from the center of the immersion pit along the axis. Pre-set holes are drilled at the monitoring points, and the depths of the monitoring points are all different, generally decreasing gradually from the center outwards. The settlement of each soil layer is the settlement difference between adjacent monitoring points.

[0034] The isolation sleeve 2 is vertically inserted into the preset hole and fixed with materials such as sand and gravel to ensure the stability and verticality of the isolation sleeve 2.

[0035] A gap must be left between the inner wall of the isolation sleeve 2 and the outer wall of the spliced ​​measuring rod 1 to be inserted later, so that the measuring rod can sink freely.

[0036] Several sets of spliced ​​measuring rods 1 are sequentially spliced ​​together to form a long rod through connecting components, and sealing elements are set between adjacent measuring rods to ensure tightness and watertightness of the connection.

[0037] A scale line 5 is set on the spliced ​​measuring rod 1 for subsequent observation of settlement.

[0038] Insert the assembled long rod into the isolation sleeve 2, ensuring that the long rod can be inserted vertically and stably into the hole.

[0039] A level instrument 4 is installed on the top of the support frame 3. The level instrument 4 is arranged in correspondence with the spliced ​​measuring rod 1 so that a level line can be emitted to the spliced ​​measuring rod 1. The level line and the scale line 5 on the spliced ​​measuring rod 1 correspond to represent the current depth. The settlement is calculated by using the difference between the current depth and the initial depth.

[0040] The scheme is further optimized. The connecting component includes a connecting rod 6, with threaded rods fixed at both ends of the connecting rod 6. The two ends of the spliced ​​measuring rod 1 are respectively provided with mounting grooves. The mounting grooves are coaxially arranged with the spliced ​​measuring rod 1. A threaded hole is provided at the center of the mounting groove. The threaded rods at both ends of the connecting rod 6 are respectively threaded into the threaded grooves of the adjacent spliced ​​measuring rod 1.

[0041] To further optimize the design, the spiral directions of the threaded grooves on adjacent spliced ​​measuring rods 1 are opposite.

[0042] Connecting rod 6 serves as an intermediate component, with threaded rods fixed at both ends. The helical direction of these threaded rods is opposite to that of adjacent spliced ​​measuring rods 1. Each end of the spliced ​​measuring rod 1 has a mounting groove, with a threaded hole matching the threaded rod at the center of the groove. During splicing, the threaded rod at one end of connecting rod 6 is screwed into the threaded hole of one spliced ​​measuring rod 1, while the threaded rod at the other end is screwed into the threaded hole of an adjacent spliced ​​measuring rod 1, achieving a tight connection. This design not only ensures a stable connection between the spliced ​​measuring rods 1 but also facilitates subsequent disassembly and reassembly, improving the flexibility and adaptability of the device.

[0043] The design is further optimized so that the sealing element includes a sealing gasket 7, which has a through hole in the center. The sealing gasket 7 is placed between adjacent spliced ​​measuring rods 1 and abuts against the end of the spliced ​​measuring rod 1.

[0044] The sealing gasket 7 serves as a sealing element, with a through hole in the center to allow the spliced ​​measuring rod 1 to pass through. When splicing adjacent spliced ​​measuring rods 1, the sealing gasket 7 is placed between them and tightly abuts against the end of the spliced ​​measuring rod 1 to form a sealing layer. The sealing gasket 7 effectively prevents moisture, dirt, and other impurities from entering the interior of the spliced ​​measuring rod 1, protecting the internal structure from damage.

[0045] The design was further optimized by applying a rust-proof coating to the outer wall of the spliced ​​measuring rod 1.

[0046] A rust-preventive layer, such as rust-preventive paint or coating, is sprayed onto the outer wall of the spliced ​​measuring rod 1. This rust-preventive layer effectively isolates the metal surface of the measuring rod from air and moisture, preventing oxidation and rust. The specific type is selected based on actual needs.

[0047] To further optimize the scheme, the length of the long rod formed by splicing several spliced ​​measuring rods 1 is a, and the distance between the bottom of the preset hole of the monitoring point and the ground is b, 2m≥ab≥1.5m.

[0048] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An experimental device for observing pre-immersion water settlement in loess areas, characterized in that, include: A splicing measuring rod (1) is provided in several groups. The several groups of splicing measuring rods (1) are sequentially spliced ​​together by connecting components to form a long rod. A sealing element is provided between adjacent splicing measuring rods (1). An isolation sleeve (2) is vertically inserted into a preset hole at a monitoring point and fixed with sand and gravel. The spliced ​​measuring rod (1) is inserted into the isolation sleeve (2), and there is a gap between the inner wall of the isolation sleeve (2) and the outer wall of the spliced ​​measuring rod (1). The monitoring mechanism includes a support frame (3) and a level (4). The level (4) is installed on the top of the support frame (3) and is arranged correspondingly to the spliced ​​measuring rod (1). The spliced ​​measuring rod (1) is provided with scale lines (5).

2. The experimental device for observing pre-immersion water settlement in loess areas according to claim 1, characterized in that: The connecting assembly includes a connecting rod (6), with threaded rods fixed at both ends of the connecting rod (6). The two ends of the spliced ​​measuring rod (1) are respectively provided with mounting grooves. The mounting grooves are coaxially arranged with the spliced ​​measuring rod (1). A threaded hole is provided at the center of the mounting groove. The threaded rods at both ends of the connecting rod (6) are respectively threaded into the threaded grooves of the adjacent spliced ​​measuring rod (1).

3. The experimental device for pre-immersion water settlement observation in loess areas according to claim 2, characterized in that: The spiral directions of the threaded grooves on adjacent spliced ​​measuring rods (1) are opposite.

4. The experimental device for pre-immersion water settlement observation in loess areas according to claim 1, characterized in that: The sealing element includes a sealing gasket (7), which has a through hole in the center. The sealing gasket (7) is disposed between adjacent spliced ​​measuring rods (1) and abuts against the end of the spliced ​​measuring rod (1).

5. The experimental device for observing pre-immersion water settlement in loess areas according to claim 1, characterized in that: The outer wall of the spliced ​​measuring rod (1) is coated with an anti-rust layer.

6. The experimental device for observing pre-immersion water settlement in loess areas according to claim 1, characterized in that: The length of the long rod formed by splicing several of the spliced ​​measuring rods (1) is a, and the distance between the bottom of the preset hole of the monitoring point and the ground is b, 2m≥ab≥1.5m.

Images