A foundation pit construction whole-process working condition recording method based on a BIM model

Abstract

A kind of whole-process working condition recording method of foundation pit construction based on BIM model, comprising the following steps: establishing foundation pit BIM model, coding each related component;Earthwork is finely layered and block cut and coded according to construction plan;BIM model is uploaded to server after engine light weight processing, and is accessed by system calling relevant interface;Working condition input based on BIM model;The input working condition data is stored in system database, and system working condition query, calculation and analysis are provided.The present application overcomes the shortcomings of the prior art, and accurately records the complex working condition data of the main construction stage of the whole-process foundation pit construction by using the three-dimensional information of the foundation pit contained in the BIM model component, and realizes the whole-process management of the foundation pit construction.By coding the related components of the whole-process foundation pit construction, only one BIM model needs to be created, which can be applied to the working condition input of the whole-process foundation pit construction.Through the fine recording of the whole-process foundation pit construction working condition, it can be applied to the risk early warning analysis and construction efficiency analysis of foundation pit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit informatization construction, in particular to a foundation pit construction whole-process working condition recording method based on a BIM model. BACKGROUND

[0002] In the process of foundation pit construction, the foundation pit construction working condition has a great influence on project progress management and foundation pit safety control, therefore, how to accurately and efficiently record the foundation pit construction working condition is particularly important.

[0003] The foundation pit construction working condition recording has experienced the following three stages of development:

[0004] 1. Paper recording stage: In this stage, paper reports and documents (such as construction plan paper approval report, actual earthwork excavation single, etc.) are used to record the foundation pit construction working condition. Since the foundation pit construction working condition contains complex information such as specific position, shape, and volume, manual reporting generally often needs to combine cross-section drawings of each direction and more textual descriptions to record the foundation pit construction working condition. The disadvantage of this stage is that the working condition recording is not informationized, and the paper recording is difficult to consult and analyze.

[0005] 2. Manual input information stage of text, quantity, and two-dimensional pictures With the development of foundation pit engineering informatization, the common construction process is standardized to some extent, manual input of text description and quantity information, uploading of pictures and video data, and input of construction working condition in the form of forms, pictures, and videos into the information system. According to the query, this stage uses GIS technology to assist in recording the construction working condition in the form of GIS maps. The disadvantages of this stage are: 1) the form needs a lot of manual input; 2) most of the input is unstructured data such as text, pictures, and videos, which is only suitable for inquiry and difficult to further apply; 3) the GIS map also only contains two-dimensional information, and the complex three-dimensional information contained in the foundation pit working condition cannot be reflected.

[0006] 3. BIM application exploration stage: The application of BIM technology in the field of foundation pit construction working condition recording is currently in the exploratory stage in China. By searching for the keywords such as "foundation pit construction working condition" in the patent system, only two patents in the substantive examination stage (CN_111651823, CN_112699442_A) are found, which both need to establish multiple BIM models to calculate the earthwork excavation volume or earthwork excavation efficiency through the comparison between the models.

[0007] In summary, there is currently no method for recording the whole-process fine working condition of foundation pit construction based on a single BIM model. SUMMARY

[0008] In view of the deficiencies of the prior art, the present application provides a BIM model-based whole-process working condition recording method for foundation pit construction, which overcomes the deficiencies of the prior art, accurately records the complex working condition data of the main construction stages of the whole-process foundation pit construction by using the three-dimensional information of the BIM model components, and realizes whole-process management of the foundation pit construction.

[0009] To achieve the above object, the present application is implemented by the following technical solutions:

[0010] A BIM model-based whole-process working condition recording method for foundation pit construction, comprising the following steps:

[0011] Step S1: Establish a foundation pit BIM model, encode the enclosure, dewatering well, monitoring point, earthwork, support and structural plate; finely divide the earthwork into layers and blocks according to the construction plan and encode them;

[0012] Step S2: upload the BIM model established in step S1 to the server after engine lightweight processing, and access it by calling the relevant interface of the system;

[0013] Step S3: input the construction working conditions of the enclosure, dewatering well and monitoring point based on the BIM model;

[0014] Step S4: input the working conditions of earthwork excavation and support erection in the foundation pit excavation stage;

[0015] Step S5: input the working conditions of the structural plate and dismantling support construction;

[0016] Step S6: store the input working condition data in the system database and provide system working condition query, calculation and analysis.

[0017] Preferably, the earthwork block division in step S1 is: vertically divide the soil layer with 100-300mm reserved under each layer of support as the boundary line; divide the plane soil body of each layer of soil with the support as the boundary reference.

[0018] Preferably, the working condition input of the enclosure, dewatering well and monitoring point in step S3 comprises:

[0019] Each working condition on the BIM model is displayed with an agreed attribute state before the construction is completed; after the construction is completed, select the corresponding component number by clicking the component on the BIM model, input the construction date, then the system displays the change of the component attribute state on the model, and the number and date are stored in the system database, i.e. the working condition input is completed;

[0020] Or each individual case number to table form single or batch selection, instead of the model on the components; from the list of component number and input construction date, the relevant components on the BIM model state from the original display to display, component number and date stored in the system database, complete the working condition input.

[0021] Preferably, the step S6, the system working condition query, calculation and analysis includes earth excavation efficiency calculation and analysis and steel support statistical analysis.

[0022] Preferably, the earth excavation efficiency calculation and analysis method comprises the following steps:

[0023] Step S601: calculate the average daily earthwork efficiency of the current layer, if there are multiple layers excavated simultaneously, then calculate the earthwork efficiency of different layers respectively;

[0024] Step S602: calculate the historical statistics of similar excavation efficiency; calculate the mean and variance of the historical data of the current layer excavation efficiency according to the layer, and calculate the mean and variance of the overall excavation efficiency of the whole foundation pit;

[0025] Step S603: compare the current excavation efficiency of the foundation pit with the historical statistical data.

[0026] Preferably, in step S601, the method for calculating the average daily earthwork efficiency of the current layer, if there are multiple layers excavated simultaneously, then calculate the earthwork efficiency of different layers respectively, is as follows:

[0027] The earthwork efficiency of each layer = the total earthwork volume of the layer / (the last day of earthwork date of the layer - the first day of earthwork date of the layer + 1)

[0028] The total earthwork efficiency of each foundation pit partition = the total earthwork volume of the foundation pit / (the last day of earthwork date of the foundation pit - the first day of earthwork date of the foundation pit + 1).

[0029] The application provides a BIM model-based whole-process working condition recording method for foundation pit construction. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the application or the prior art, the drawings needed to be used in the prior art description will be briefly introduced as follows.

[0031] Figure 1 The whole-process working condition recording method flowchart of the application;

[0032] Figure 2 The foundation pit plane earthwork division schematic diagram in the application;

[0033] Figure 3 The foundation pit earthwork division profile in the application;

[0034] Figure 4 The BIM model earthwork selection schematic diagram in the application;

[0035] Figure 5 The cushion and bottom plate division schematic diagram of the application;

[0036] Figure 6 The average value statistical diagram of each layer excavation efficiency of a foundation pit system in a soft soil area in the fourth embodiment of the application;

[0037] Figure 7 The excavation efficiency analysis explanatory diagram of a foundation pit in the fourth embodiment of the application;

[0038] Figure 8 The current foundation pit layer 7 earth excavation detail diagram in the fourth embodiment of the application;

[0039] Figure 9 The excavation efficiency comparison diagram of each foundation pit layer 7 in the fourth embodiment of the application. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the present application will be clearly and completely described below in combination with the drawings in the present application.

[0041] Embodiment one, as shown, a BIM model-based foundation pit construction full-process working condition recording method, comprising the following steps: Figures 1 to 5

[0042] Step S1: Establishing a foundation pit BIM model, coding the enclosure, dewatering well, monitoring point, earthwork, support and structural plate; the earthwork is finely divided into layers and blocks according to the construction plan and coded;

[0043] In this step, for the earthwork, the foundation pit BIM model should be reasonably divided into blocks according to the construction plan: according to the construction plan, the vertical soil layer is divided with 100-300 mm reserved under each layer of support as the boundary line; generally, the plane soil body of each layer is divided with the support as the boundary reference, if the support is far away or there is no support, the earthwork plane block division standard can be determined according to the specific construction scheme. When the construction plan is adjusted, the soil body block division should be adjusted in time.

[0044] Step S2: uploading the BIM model established in step S1 to the server after engine lightweight processing, and calling the related interface by the system;

[0045] Step S3: inputting the construction working condition of the enclosure, dewatering well and monitoring point based on the BIM model;

[0046] Among them, there are two optional ways for the enclosure working condition input: the operator inputs the number of the diaphragm wall on the BIM model, the construction date on the system, changes the state attribute (color, transparency, visibility, etc.) of the diaphragm wall on the BIM model displayed on the system through system application processing, changes it to a dark gray color close to the actual color (the color before and after construction can also be set according to other agreed colors), indicating that the diaphragm wall has completed the construction, and the diaphragm wall number and date are stored in the system database. In addition, for other types of enclosure such as work pile and cast-in-place pile, the form of recording working condition based on BIM model is similar to the above-mentioned diaphragm wall method, and in actual application, multiple piles can be numbered and input in groups;

[0047] For the dewatering well construction working condition input: the operator selects the dewatering well component on the model or directly selects the dewatering well number through the form on the system, and inputs the construction completion date at the same time, the corresponding dewatering well on the system BIM model changes the display state attribute, and the construction dewatering well number and date are stored in the system database.

[0048] ​For the input of monitoring point construction condition: after the installation of the monitoring point is completed, the operator selects the monitoring point on the BIM model or directly inputs the relevant monitoring point number through the form, and at the same time inputs the construction completion date, the construction monitoring point number and date are stored into the system database, and the corresponding monitoring point on the system BIM model is displayed in different construction states with different state attributes. (The color of the monitoring point selected on the model can be set to be semi-transparent before construction and a predetermined color after construction; in the case of form selection, the monitoring point is changed from hidden to displayed).

[0049] Step S4: earthwork excavation, support erection condition input in foundation pit excavation stage;

[0050] Among them, during the construction process of foundation pit earthwork excavation, the operator selects the earth block completed on the same day according to the actual construction condition on the BIM model of the system, and at the same time inputs the excavation date, and the state attribute of the relevant earth block on the system is changed from display to hidden (indicating that the excavation is completed), and the number of the earthwork constructed on the same day on the BIM model is stored in the system database. Thus, the earthwork excavation condition record is completed.

[0051] In addition, since the erection of steel support is generally carried out on the same day after the relevant soil is excavated, after setting the association between steel support and soil, the erection time of steel support can be automatically set according to the condition of the associated earthwork, that is, when the earthwork associated with the steel support is set to have been excavated on the system, the state of the steel support is automatically changed from hidden to displayed, and the number and date are stored in the system, and the steel support is automatically set to have been erected, thereby completing the steel support erection condition record.

[0052] Step S5: structure plate, support removal construction condition input;

[0053] Among them, there are two ways to input the construction condition of the structure plate: one is that the structure plate is originally displayed in the foundation pit in a semi-transparent state, and the structure plate and the construction completion date are selected, and after the construction, the color, transparency and other states of the structure plate on the model are changed, and the number and construction completion date of the structure plate are stored in the system, and the structure plate is displayed to have completed the construction. Another way is that the structure plate is initially set to be hidden on the model of the system, and the number of the structure plate is input into the system in the form of a table in advance, and the operator selects the structure plate number and the construction date, and after input, the structure plate is displayed on the foundation pit model, and the number and construction date are stored in the system.

[0054] During the support removal process of the foundation pit, the support removal date and support number (selected by selecting the support on the model or by selecting the number) are selected on the system, and after input, the support removal time is recorded. The relevant support is hidden on the BIM model, and the number and date are stored in the system, thereby completing the support removal condition record.

[0055] Step S6: store the input working condition data into the system database, and provide system working condition query, calculation and analysis.

[0056] The application realizes accurate recording of complex working condition data of main construction stages (enclosure, dewatering well construction, monitoring point layout, earthwork excavation, support erection and removal, structure plate pouring) of the whole process of foundation pit construction by constructing the three-dimensional information of the foundation pit based on the BIM model components, and realizes the whole process management of the foundation pit construction; by pre-planning and coding the related components of the whole process of foundation pit construction according to certain standards, only one BIM model needs to be created before project application, and the model does not need to be frequently rebuilt, so that it can be applied to the working condition input of the whole process of foundation pit construction. And by selecting components on the model or selecting component codes in table form in batches, and selecting time, the working condition recording can be completed, without manually inputting a large amount of text and data.

[0057] In addition, the whole process of foundation pit construction working condition can be recorded in detail, and the recorded working conditions have rich structured data information (contained in the BIM model information) such as excavation depth, area, shape of different areas, topological relationship between excavation surface and enclosure, support, monitoring point, structure plate and other components, which can be applied to foundation pit risk early warning analysis, construction efficiency analysis, etc.

[0058] Example two, implementation example of BIM model-based foundation pit earthwork excavation working condition recording

[0059] Step S01: BIM model earthwork division and modeling

[0060] The plane view and sectional view of the earthwork of a certain foundation pit are shown in Figure 2 , Figure 3 The earthwork is divided into 6 layers, each layer has 12 blocks, a total of 72 blocks of earth.

[0061] The Revit is used according to the size Figure 2 , 3 to establish a foundation pit BIM model with 6 layers and 12 blocks of earthwork in each layer. The earthwork plane is divided according to the support as the boundary, and the earthwork thickness is calculated by reserving a certain size downward from the edge below the support position as shown. Figure 2 Figure 3

[0062] The cut earth blocks are established on the foundation pit BIM model according to the above size.

[0063] Step S02: after the BIM model is completed, it is uploaded to the server after lightweight processing by the BIM engine, and the system calls related interfaces for access.

[0064] Step S03: the user of the foundation pit construction stage selects the input working condition of the earthwork that has been excavated in the system adding working condition interface, such as Figure 4 ​​As shown, select a piece of earthwork (a piece of earthwork with darker color) on the BIM model, multiple selection at a time, select the date, select the confirmation input button, and the relevant earthwork excavation conditions can be input. After input, the system automatically completes the calculation and storage of the earthwork excavation amount on the same day.

[0065] As shown, Figure 4 When the earthwork is completed, the relevant support is displayed on the system interface, and the support number and date are recorded in the system database, thereby realizing the automatic support operation.

[0066] The manual selection of the support adding process adopts the form of a table, the support is numbered and grouped by layers in advance, the support numbers of different layers are selected on the support adding interface, the construction date is selected, and after confirmation, the selected numbers of the support are displayed on the model, and the support numbers are stored in the database according to the date, thereby realizing the support condition input.

[0067] Example three, a base pit cushion and bottom plate construction condition recording implementation example based on a BIM model:

[0068] Step S11: The base pit bottom plate is divided into blocks according to the actual construction plan.

[0069] The following Figure 5 is a base pit bottom plate division schematic diagram. The cushion is divided and the bottom plate is consistent. The bottom plate 1-bottom plate 4 is numbered and defined as “DB_1”-“DB_4” in this example, and the corresponding cushion number is defined as “DC_1”-“DC_4”.

[0070] Step S12: The cushion or bottom plate number and construction completion date are input on the system, the corresponding cushion or bottom plate in the base pit model on the system is changed from hidden to displayed, the cushion or bottom plate number and date are stored in the system, and the condition input is completed.

[0071] The cushion has another automatic condition input method: after each earthwork excavation input, the system checks whether the corresponding earthwork of the cushion has been completed, if yes, the number of the cushion is assigned to complete the construction on the date, the cushion is changed from hidden to displayed on the system model, and the number and date are stored in the system.

[0072] Example four, as shown, Figures 6-9 The application also discloses a soil excavation efficiency calculation and analysis method and a steel support statistical analysis method.

[0073] The soil excavation efficiency calculation and analysis method comprises the following steps:

[0074] Step S601: Calculate the average daily excavation efficiency of the current layer, if there are multiple layers excavated at the same time, calculate the excavation efficiency of different layers respectively;

[0075] Since there are sometimes multilayer excavation at the same time, the single-layer excavation speed and the overall excavation speed are counted respectively:

[0076] The efficiency of each layer of earthwork = the total volume of earthwork of this layer / (the last day of earthwork of this layer - the first day of earthwork of this layer + 1)

[0077] The overall earthwork efficiency of each excavation area = the total volume of earthwork of this excavation area / (the last day of earthwork of this excavation area - the first day of earthwork of this excavation area + 1).

[0078] Step S602: Calculate the historical statistics of the same type of excavation efficiency; the mean and variance of the historical data of the current layer excavation efficiency calculated by layer, and the mean and variance of the overall excavation efficiency calculated by the overall excavation area.

[0079] Step S603: Compare the current excavation efficiency of the excavation area with the historical statistical data.

[0080] As shown in Figure 6 , according to the data statistical analysis, the mean of one standard deviation range is 80%, and the deviation ±80% range is defined as the moderate excavation speed.

[0081] Regarding the excavation speed efficiency analysis rule: if it is within the deviation range of 80% of the recommended value (i.e. the range of 0.2 times and 1.8 times of the recommended value), it is considered that the current excavation efficiency is moderate; if the excavation speed is lower than 20% of the recommended value, it is considered that the excavation speed is slow; if the excavation speed is higher than 1.8 times of the recommended value, it is considered that the excavation speed is fast.

[0082] The current excavation efficiency of the excavation area is listed together with the historical data of other excavation areas, and is displayed in the form of column chart, line chart and other analysis graphics. As shown in Figures 7-9 .

[0083] The risk factors of the excavation area are various, and the common single-factor risk analysis cannot fully meet the requirements of risk early warning analysis. The geotechnical theory, actual geological conditions, surrounding environmental conditions, construction conditions, and construction experience should be combined to conduct comprehensive risk early warning analysis on multiple factors.

[0084] The working condition information recorded by the method is comprehensive and timely, and the earthwork position, soil layer depth, support erection condition, earthwork volume and other information contained in the working condition information can be provided to the related risk early warning system as input parameters for risk early warning analysis.

[0085] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for recording the entire construction process of a foundation pit based on a BIM model, characterized in that, Includes the following steps: Step S1: Establish a BIM model of the foundation pit and code the retaining wall, dewatering wells, monitoring points, earthwork, supports, and structural slabs; the earthwork is finely divided into layers and blocks according to the construction plan and coded accordingly. Step S2: After the BIM model established in step S1 is processed by the engine to be lightweight, it is uploaded to the server and accessed by the system through the relevant interface. Step S3: Input the construction conditions for the retaining structure, dewatering wells, and monitoring points based on the BIM model; Step S4: Input the earthwork excavation and support erection conditions during the foundation pit excavation stage; Step S5: Input the structural slab and support removal construction conditions; Step S6: Store the input operating condition data into the system database to provide system operating condition query, calculation and analysis; In step S3, the input of construction conditions for the retaining structure, dewatering wells, and monitoring points includes: Before construction is completed, each work condition is displayed in a pre-defined attribute state on the BIM model. After construction is completed, by clicking on the component on the BIM model, selecting the corresponding component number, and entering the construction date, the system will then display the change in the component attribute state on the model, and the number and date will be stored in the system database, thus completing the work condition input. Alternatively, you can select individual or batch work case numbers in a form instead of clicking on components on the model; after selecting the component number from the list and entering the construction date, the status of the relevant component on the BIM model will change from not being displayed to being displayed, and the component number and date will be stored in the system database, thus completing the work case input; In step S6, the system operating condition query, calculation and analysis include earthwork excavation efficiency calculation and analysis and steel support statistical analysis; The method for calculating and analyzing earthwork excavation efficiency includes the following steps: Step S601: Calculate the average daily excavation efficiency of the current layer. If multiple layers are excavated simultaneously, calculate the excavation efficiency of each layer separately. Step S602: Calculate the historical statistics of excavation efficiency for the same type; calculate the mean and variance of the historical data of the current layer's excavation efficiency by layer, and calculate the mean and variance of the overall excavation efficiency for the entire foundation pit; Step S603: Compare the current excavation efficiency of the foundation pit with historical statistical data; In step S601, the average daily excavation efficiency of the current layer is calculated. If multiple layers are excavated simultaneously, the methods for calculating the excavation efficiency of different layers are as follows: Earthwork efficiency for each layer = Total excavation volume of that layer / (Date of excavation on the last day of that layer - Date of excavation on the first day of that layer + 1) Overall excavation efficiency of each foundation pit zone = total excavation volume of the foundation pit / (last day of excavation for the foundation pit - first day of excavation for the foundation pit + 1).

2. The method for recording the entire construction process of a foundation pit based on a BIM model as described in claim 1, characterized in that: The earthwork segmentation in step S1 is as follows: vertical soil layer segmentation is performed with a 100-300mm margin reserved under each support as the dividing line; and planar soil segmentation is performed with the support as the boundary reference.

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