Multi-section soft soil stratum deep foundation pit space positioning method

Abstract

The invention relates to a multi-section soft soil stratum deep foundation pit space positioning method. Comprising the following steps: S1, establishing a three-dimensional solid model of a foundation pit; s2, a sectioning surface is set for sectioning the three-dimensional solid model; s3, layered excavation coordinates are extracted; s4, collecting excavation data of each layer: according to the elevation design of layered excavation, repeating the steps S2 and S3, and completing three-dimensional entity model sectioning of a plurality of layered excavation planes and layered excavation coordinate extraction work; and then uniformly extracting and collecting coordinate data of each layer to guide site construction as a space positioning basis in a foundation pit excavation process. According to the method, layered excavation of the deep foundation pits with multiple section depths under the soft soil foundation is accurately positioned, slope ratio and plane position construction control in the foundation pit excavation supporting process is facilitated, and the stability in the foundation pit construction process is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation pit construction, and in particular relates to a spatial positioning method for a deep foundation pit in a multi-section soft soil stratum. Background Art

[0002] With the development of society, a wide variety of building and structure structures have emerged. These structures, depending on their functional requirements, involve a variety of cross-sectional depths. Consequently, the same foundation pit project requires multiple excavation depths based on the structural form. For foundation pits with multiple excavation depths located on soft soil and lacking gentle slope conditions, strict control of the layered excavation slope ratios and precise calculation of the spatial coordinates and elevations of each layer are required. Strict adherence to the excavation process ensures overall stability during the excavation.

[0003] In the existing deep foundation pit excavation construction in soft soil strata, the ability to guarantee the process parameters of the excavation construction is poor, and it is difficult to ensure the overall stability during the excavation process. Summary of the Invention

[0004] The purpose of the present invention is to provide a spatial positioning method for deep foundation pits in multi-section soft soil layers, which can accurately locate the deep foundation pits of various section depths under the soft soil foundation by layered excavation, which is beneficial to the slope ratio and plane position control during the foundation pit excavation and support process, and ensure the stability during the foundation pit construction process.

[0005] The technical solution adopted by the present invention is: a spatial positioning method for a deep foundation pit in a soft soil layer with multiple sections, comprising the following steps: step S1, establishing a three-dimensional solid model of the foundation pit: according to the data given in the foundation pit design file, using three-dimensional drawing software to establish a three-dimensional solid model of the foundation pit, and the spatial position in the three-dimensional solid model matches the design file; step S2, setting a cutting plane to cut the three-dimensional solid model: designing a layered excavation plane and setting a cutting plane of the three-dimensional solid model of the foundation pit under the layered excavation plane, using the cutting command of the three-dimensional drawing software to cut the three-dimensional solid model of the foundation pit using the cutting plane to form a lower entity and an upper entity The three-dimensional solid model is divided into two parts; step S3, layered excavation coordinate extraction: use the coordinate annotation function of the three-dimensional drawing software to extract the layered coordinates of the foundation pit plane, linearly mark the foundation pit layer boundary line in the lower entity, and combine the foundation pit layer elevation to obtain the spatial three-dimensional data under the layered excavation thickness; step S4, collection of excavation data of each layer: according to the elevation design of the layered excavation, repeat steps S2 and S3 to complete the three-dimensional solid model sectioning and layered excavation coordinate extraction of multiple layered excavation planes; then the coordinate data of each layer are uniformly extracted and collected to guide on-site construction and serve as the basis for spatial positioning during the foundation pit excavation process.

[0006] Preferably, in step S1, the data includes foundation pit excavation depth design data, plane position coordinate data, foundation pit slope ratio data, and foundation pit partition position data.

[0007] Preferably, in step S2, the elevation of the layered excavation is determined according to the layered excavation thickness setting of the foundation pit special construction plan and the working condition setting data in the foundation pit stability calculation book, and a plurality of layered excavation planes are obtained.

[0008] The advantages and positive effects of the present invention are:

[0009] The present invention provides a spatial positioning method for deep foundation pits in soft soil strata with multiple sections. The method is a method that performs spatial positioning design based on three-dimensional drawing software before foundation pit excavation construction, and extracts and collects data through spatial positioning design to guide on-site construction. For relatively complex deep foundation pits, by establishing a foundation pit excavation entity model, the actual spatial shape of the foundation pit after excavation can be intuitively displayed. By adopting the method of sectioning and extraction on the three-dimensional entity model to obtain the layered excavation coordinates, it is not only convenient to operate but also more accurate than the conventional two-dimensional linear offset data calculation method (which will produce cumulative errors). It can provide a reliable basis for determining the spatial position of the layered excavation of the foundation pit and ensure the overall stability during the foundation pit excavation and support process.

[0010] On the other hand, the present invention accurately positions the layered excavation of deep foundation pits of various cross-section depths under the soft soil foundation, which is not only beneficial to the slope ratio and plane position control during the foundation pit excavation and support process, and ensures the safety during the foundation pit construction process, but also relies on the three-dimensional solid model of the foundation pit to accurately calculate the foundation pit excavation, backfill volume and foundation pit support area, which serves as a reliable basis for engineering measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of step S1 of the present invention;

[0012] Figure 2 is a schematic diagram of step S2 of the present invention;

[0013] Figure 3 is a schematic diagram of step S3 of the present invention;

[0014] Figure 4 is a schematic diagram of step S4 of the present invention;

[0015] In the figure, 1. 3D entity model; 2. Cutting plane; 3. Lower entity; 4. Upper entity; 5. Foundation pit layer boundary line; 6. Foundation pit plane layer coordinates; 7. Coordinate data of each layer. DETAILED DESCRIPTION

[0016] In order to further understand the content, features and effects of the present invention, the following embodiments are given to illustrate in detail.

[0017] See Figures 1 to 4 The spatial positioning method of a multi-section soft soil deep foundation pit of the present invention comprises the following steps:

[0018] Step S1, establishing a three-dimensional solid model of the foundation pit: according to the data given in the foundation pit design file, a three-dimensional solid model 1 of the foundation pit is established using three-dimensional drawing software, and the spatial position in the three-dimensional solid model 1 matches the design file.

[0019] In this step S1, the data includes the foundation pit excavation depth design data, plane position coordinate data, foundation pit slope ratio data and foundation pit partition position data. These data are recorded in the project construction plan file, that is, the foundation pit design file. The above data are imported into the 3D drawing software to form the following: Figure 1 The three-dimensional solid model 1 shown in the figure can be regarded as a virtual mapping of the real foundation pit.

[0020] Step S2, set the cutting plane to cut the three-dimensional solid model: design a layered excavation plane and set the cutting plane 2 of the three-dimensional solid model 1 under the layered excavation plane, and use the cutting command of the three-dimensional drawing software to cut the three-dimensional solid model 1 using the cutting plane 2 to form two parts: the lower entity 3 and the upper entity 4.

[0021] In this step S2, the elevation of the layered excavation is determined according to the layered excavation thickness setting of the foundation pit special construction plan and the working condition setting data in the foundation pit stability calculation book, and multiple layered excavation planes are obtained, thereby obtaining multiple cutting planes 2. The relative position relationship between the cutting plane 2, the lower entity 3 and the upper entity 4 is shown in FIG. Figure 2 As shown in .

[0022] Step S3, layered excavation coordinate extraction: Use the coordinate annotation function of the three-dimensional drawing software to extract the foundation pit plane layer coordinates 6, linearly annotate the foundation pit layer boundary line 5 in the lower entity 3, and combine the foundation pit layer elevation to obtain the spatial three-dimensional data under the layered excavation thickness.

[0023] like Figure 3 As shown in , after cutting with the cutting plane 2, the foundation pit stratification boundary line 5 can be seen on the surface of the lower entity 3. The foundation pit stratification boundary line 5 is the intersection contour line of the horizontal cutting plane 2 and the three-dimensional entity model 1. The foundation pit plane stratification coordinates 6 are extracted from the key nodes on the aforementioned intersection contour line, that is, the foundation pit stratification boundary line 5.

[0024] Step S4, collection of excavation data for each layer: according to the elevation design of the layered excavation, repeat steps S2 and S3 to complete the three-dimensional solid model sectioning and layered excavation coordinate extraction of multiple layered excavation planes, that is, complete the linear marking of the layered boundary lines 5 of each foundation pit layer, and extract multiple sets of foundation pit plane layered coordinates 6; then, the coordinate data 7 of each layer (composed of multiple sets of foundation pit plane layered coordinates 6) are uniformly extracted and collected to guide on-site construction and serve as the basis for spatial positioning during the foundation pit excavation process.

[0025] like Figure 4 As shown in , in the spatial positioning file finally formed for guiding foundation pit excavation construction, the coordinate data 7 of each layer can be marked with a variety of different colors. In the figure, a series of black coordinate values ​​are used as the foundation pit plane layered coordinates 6 of the foundation pit top, a series of green coordinate values ​​are used as the foundation pit plane layered coordinates 6 of the first layer bottom, a series of dark blue coordinate values ​​are used as the foundation pit plane layered coordinates 6 of the second layer bottom, a series of light blue coordinate values ​​are used as the foundation pit plane layered coordinates 6 of the third layer bottom, a series of pink coordinate values ​​are used as the foundation pit plane layered coordinates 6 of the fourth layer bottom, and a series of red coordinate values ​​are used as the foundation pit plane layered coordinates 6 of the fifth layer bottom...

Claims

1. A spatial positioning method for deep foundation pits in multi-section soft soil layers, characterized by: The following steps are included: Step S1, establishing a three-dimensional solid model of the foundation pit: according to the data given in the foundation pit design file, a three-dimensional solid model of the foundation pit is established using a three-dimensional drawing software, and the spatial position in the three-dimensional solid model matches the design file; Step S2, setting a cutting plane to cut the three-dimensional solid model: designing a layered excavation plane and setting a cutting plane of the three-dimensional solid model of the foundation pit under the layered excavation plane, and using a cutting command of a three-dimensional drawing software to cut the three-dimensional solid model of the foundation pit into two parts of a lower entity and an upper entity using the cutting plane; Step S3, extracting layered excavation coordinates: using the coordinate annotation function of the three-dimensional drawing software to extract the layered coordinates of the foundation pit plane, linearly annotating the layered boundary lines of the foundation pit in the lower entity, and combining the layered elevation of the foundation pit to obtain the spatial three-dimensional data under the layered excavation thickness; Step S4, collection of excavation data for each layer: according to the elevation design of the layered excavation, repeat steps S2 and S3 to complete the 3D solid model sectioning and layered excavation coordinate extraction of multiple layered excavation planes; then, the coordinate data of each layer are uniformly extracted and collected to guide on-site construction and serve as the basis for spatial positioning during the foundation pit excavation process.

2. The spatial positioning method for deep foundation pit in multi-section soft soil stratum according to claim 1, characterized in that: In step S1, the data includes foundation pit excavation depth design data, plane position coordinate data, foundation pit slope ratio data and foundation pit partition position data.

3. The spatial positioning method for deep foundation pit in multi-section soft soil stratum according to claim 2, characterized in that: In step S2, the elevation of the layered excavation is determined according to the layered excavation thickness setting of the foundation pit special construction plan and the working condition setting data in the foundation pit stability calculation book, and a plurality of layered excavation planes are obtained.

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