Medium-depth foundation pit supporting assembly construction method based on BIM technology and supporting assembly

Abstract

The invention relates to the technical field of foundation pit supporting equipment, and discloses a medium-depth foundation pit supporting assembly construction method based on the BIM technology and a supporting assembly.The supporting assembly comprises base plates arranged on the two opposite sides of the side wall of a foundation pit, a plurality of sets of drainage holes formed in the base plates at preset installation intervals, a plurality of fixing rods, fixing pieces and at least two anchor rods; the fixing rod comprises a first rod body and a second rod body which are connected in a sliding mode in the axis direction of the fixing rod, the two opposite ends of the fixing rod are connected with the base plate, and locking pieces are arranged at the two adjacent ends to reversely lock the fixing rod when the fixing rod is stretched. According to the supporting assembly, in the construction process, compared with a previous construction mode that profile steel is adopted for positioning and mounting, the damage degree to the pit wall of the foundation pit is reduced, the mounting position of each base plate can be adjusted at will in the construction process so as to be matched with a base of the foundation pit for positioning and mounting, and the construction efficiency is improved. And secondary trepanning processing does not need to be carried out on the substrate, so that the construction difficulty and the construction cost are obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support equipment, and in particular to a method for constructing a medium-deep foundation pit support component based on BIM technology and a support component. Background Art

[0002] At present, when supporting and reinforcing the side of the foundation pit, the installation spacing of the steel section is usually set according to the size specifications of the base plate, and one side of the steel section is embedded into the pit wall of the foundation pit based on the installation spacing to form a fixed position. The base plate is then installed on the other side of the steel section and fixed with bolts to complete the support of the pit wall. Finally, diagonal braces are installed to reinforce the base plate.

[0003] However, when installing the steel section, auxiliary tools are needed to embed it into the pit wall of the foundation pit, which not only increases the construction difficulty, but also the installation position cannot be adjusted at will; if the installation holes of two adjacent steel sections are not on the same axis, the installation holes on the base plate cannot be aligned with the bolt holes on the surface of the steel section, resulting in the base plate being unable to be fixed, and it is often necessary to drill holes in the base plate a second time, which reduces the construction efficiency and increases the construction cost. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method for constructing a medium-deep foundation pit support component and a support component based on BIM technology to solve the technical problems mentioned in the prior art.

[0005] The method for constructing a medium-deep foundation pit support component based on BIM technology is characterized by comprising the following steps:

[0006] Acquire measured data of the foundation pit site, construct a three-dimensional foundation pit model according to the measured data, analyze the soil structure of the foundation pit site to obtain soil structure data, and configure the soil structure model of the three-dimensional foundation pit model based on the soil structure data;

[0007] Read the flow section division data and earthwork calculation recorded during the foundation pit construction, and simulate the earthwork excavation based on the soil structure model according to the divided flow sections to obtain the deformation data of the soil structure caused by the earthwork excavation;

[0008] Performing secondary correction on the three-dimensional foundation pit model based on the soil structure model according to the deformation data to obtain a foundation pit simulation model;

[0009] Using soil structure data to simulate the construction of the support structure of the foundation pit simulation model according to the designated water flow section to obtain preliminary simulation data, laying out the support structure model in the foundation pit simulation model according to the preliminary simulation data, and configuring the support structure model based on the corresponding configuration of the support structure model;

[0010] Performing a structural collision check on the supporting structure model in the foundation pit simulation model to obtain collision points among the supporting structure model, the foundation pit simulation model and the supporting structure model, and judging the rationality of the supporting structure model and the supporting structure model based on the spacing between the collision points to determine the layout data of the supporting structure model and the supporting structure model;

[0011] The layout data is used to guide the installation of medium and deep foundation pit support components on site.

[0012] Furthermore, the benchmark data for the survey of the medium-deep foundation pit is determined, and the elevation points or contour lines obtained through survey in the medium-deep foundation pit based on the benchmark data are used as the actual measured data of the foundation pit site.

[0013] Furthermore, the three-dimensional foundation pit model is divided into several flow sections according to the flow section division data, and the three-dimensional scanning data of the foundation pit excavation side at the foundation pit site in each flow section is obtained, and the three-dimensional scanning data of each flow section is encoded as the basic input of the soil structure model. By constructing a neural network model with multiple convolution channels, the soil structure is trained and analyzed to obtain the corresponding soil structure characteristics, and the soil structure characteristics are extracted to obtain the structure prediction model; the flow section division data and earthwork calculation recorded during the foundation pit construction are read, and a closed isosurface is generated for the structure prediction model to form a soil layer solid block, and the soil structure model is generated with the soil layer solid block as the benchmark.

[0014] Furthermore, the method of obtaining deformation data of soil structure deformation caused by earth excavation through earth excavation simulation includes:

[0015] Read the flow section division data recorded during the foundation pit construction, and divide the medium-deep foundation pit into several flow sections;

[0016] At least one of the water flow sections is selected as the monitoring section, and a number of displacement sensors are successively arranged outward along the edge of the excavation surface of the medium-deep foundation pit, and the displacement and strain data of the adjacent retaining wall structure during soil excavation are collected through the displacement sensors;

[0017] According to the displacement and strain data, the finite element analysis model is used to generate the deformation form of the foundation pit and the deformation value of the critical area;

[0018] The pit deformation morphology is obtained, the morphological features of the pit deformation morphology are extracted, and a deformation prediction model is generated based on the deformation value of the critical area corresponding to each morphological feature. The deformation prediction model is used to predict other flow sections in the medium-deep foundation pit to obtain the deformation data of the entire soil structure model.

[0019] Furthermore, the collision points between the foundation pit simulation model and the supporting structure model are used as a basis for determining the rationality of the supporting structure model and the supporting structure model, with the number of points with a spacing of less than 20 mm being less than or equal to 3.

[0020] The present invention further provides a medium-deep foundation pit support assembly, which is designed by using the above-mentioned medium-deep foundation pit support assembly construction method based on BIM technology, and comprises:

[0021] Base plate models are arranged on opposite sides of the side walls of the foundation pit in the foundation pit simulation model;

[0022] The drainage capacity of the side of the base plate model adjacent to the soil structure model is simulated based on the measured data and soil structure data of the foundation pit site corresponding to the foundation pit simulation model, and the drainage capacity data is calculated;

[0023] According to the drainage capacity data, a plurality of drainage hole units are provided on the substrate model along a preset installation spacing;

[0024] A support structure model is arranged between the relative base plate models in the foundation pit simulation model, and the support structure model includes:

[0025] A plurality of fixed rod assemblies, wherein the fixed rod assemblies include a first rod unit and a second rod unit that are slidably connected along the axial direction thereof, the opposite ends of the first rod unit and the second rod unit are respectively extended to be connected to the base plate model located on the opposite sides of the side wall of the foundation pit model, and the adjacent ends of the first rod unit and the second rod unit are provided with locking member assemblies, and the locking member assemblies are used to reversely lock the fixed rod assembly when it is stretched;

[0026] A fixing component assembly is disposed between two adjacent groups of the base plate models, and is used to drive the two adjacent groups of the base plate models to move in opposite directions to fit closely with the opposite sides of the side walls of the foundation pit model, and to stretch the fixing rod assembly to synchronously fix the base plate models;

[0027] At least two anchor rod assemblies, the interior of the anchor rod assembly is a hollow structure, and a filling unit is arranged in the anchor rod assembly, a plurality of groups of water inlet hole units are opened on the outer periphery of the anchor rod assembly, one end of the anchor rod assembly is extended to the surrounding area with an end unit, and the end of the anchor rod assembly close to the end unit is opened with a drainage hole unit, the end of the anchor rod assembly away from the end unit passes through the drainage hole unit and is inserted into the side wall of the foundation pit model, the anchor rod assembly is used to fix and limit the installation position of the base plate model and collect water in the soil around the foundation pit model into the anchor rod assembly through the water inlet hole unit and discharge it from the drainage hole unit.

[0028] Furthermore, each two fixing rod assemblies between two adjacent groups of substrate models are provided with a group of fixing member assemblies, and the fixing member assemblies include:

[0029] A first connecting plate unit, two opposite sides of which extend to connect with the outer peripheries of the first rod body units of the two fixing rod assemblies;

[0030] A second connecting plate unit, two opposite sides of which extend to connect with the outer peripheries of the second rod body units of the two fixing rod assemblies;

[0031] A driving member assembly connects the first connecting plate unit and the second connecting plate unit to drive the first connecting plate unit and the second connecting plate unit to move in opposite directions to achieve stretching or contraction of the fixing rod assembly.

[0032] Furthermore, the driving member includes a screw unit, the outer periphery of which is threadedly connected to any one of the first connecting plate unit and the second connecting plate unit, one end of which extends to be rotatably connected to the remaining one of the first connecting plate unit and the second connecting plate unit, and the other end extends to a side away from the rotating part of the screw unit and is provided with a control unit, and the control unit is used to control the rotation of the screw unit to adjust the distance between the first connecting plate unit and the second connecting plate unit.

[0033] Furthermore, the locking member assembly comprises:

[0034] A rack unit, arranged at one end of the first rod unit;

[0035] A slide unit is provided at one end of the second rod unit and is slidably connected to the rack unit;

[0036] A pawl unit is arranged on one side of the opening of the slide slot unit, one end of which is rotatably mounted on the end of the second rod unit through a torsion spring, and the other end is engaged with the rack unit, so as to lock the fixed rod assembly when the first rod unit and the second rod unit are close to each other.

[0037] Furthermore, two adjacent groups of the substrate models are plug-connected;

[0038] A slot unit is provided on the edge side of one group of the base plate models, and a side of the slot unit close to the fixing component assembly has a guide port unit opened toward both sides;

[0039] Another group of the base plate models is provided with a cylindrical plug-in unit toward the edge of the slot unit. The position of the plug-in unit is adapted to the slot unit, and the axial direction of the plug-in unit is perpendicular to the opening direction of the guide port unit.

[0040] The present invention can not only effectively simulate the deformation data of the foundation pit simulation model caused by the construction process through modeling, but also reasonably arrange the support structure model according to the construction simulation to enhance the scientificity and rationality of the construction.

[0041] A foundation pit simulation model is constructed, and the support structure construction simulation is performed on the foundation pit simulation model according to the designated flow section based on the soil structure data to obtain preliminary simulation data. The support structure model is laid out in the foundation pit simulation model according to the preliminary simulation data, and a support structure model is configured based on the corresponding configuration of the support structure model; a structural collision check is performed on the support structure model in the foundation pit simulation model to obtain the collision points between the support structure model, the foundation pit simulation model and the support structure model, and the rationality of the support structure model and the support structure model is determined based on the distance between the collision points to determine the layout data of the support structure model and the support structure model; the layout data is used to guide the installation of medium and deep foundation pit support components on site.

[0042] Under the guidance of the present invention, the support component model not only reduces the degree of damage to the foundation pit wall during the construction process compared with the previous construction method of using steel sections for positioning and installation, but also the installation position of each group of base plate models can be adjusted at will during the construction process to match the base of the foundation pit model for positioning and installation, and there is no need to perform secondary hole drilling on the base plate, which significantly reduces the construction difficulty and construction cost. At the same time, the support component model has retractable adjustment and automatic locking functions, which can be adaptively adjusted according to the width of the foundation pit, and during the adjustment process, there is no need to use any auxiliary facilities to reversely fix it after stretching to prevent shrinkage, which can improve construction efficiency and has low use cost; at the same time, by setting the anchor rod assembly, not only the installation position of the base plate model can be fixed and limited, but also the groundwater in the soil around the foundation pit model can be discharged to maintain the soil environment around the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A method flow chart of a method for constructing a medium-deep foundation pit support assembly of the present invention;

[0044] Figure 2 It is a schematic flow chart of a method for obtaining deformation data of soil structure deformation caused by earth excavation through earth excavation simulation in the present invention;

[0045] Figure 3 It is a structural schematic diagram of a medium-deep foundation pit support assembly of the present invention;

[0046] Figure 4 For the present invention Figure 3 Schematic diagram of the structure under construction;

[0047] Figure 5 For the present invention Figure 3 A schematic diagram of the structure of the base plate and the anchor rod;

[0048] Figure 6 For the present invention Figure 5 Schematic diagram of the internal structure of the anchor rod;

[0049] Figure 7 For the present invention Figure 3 Explosion diagram of the middle fixed rod;

[0050] In the figure: 1, base plate, 2, drain hole, 3, fixing rod, 4, first rod body, 5, second rod body, 6, fixing piece, 7, locking piece, 8, anchor rod, 9, water inlet hole, 10, drain hole, 11, end, 12, fine sand layer, 13, filter layer, 14, first connecting plate, 15, second connecting plate, 16, screw rod, 17, control piece, 18, rack, 19, slide groove, 20, pawl, 21, positioning hole, 22, fastening nut, 23, slot, 24, guide port, 25, plug block. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Example 1

[0053] The method for constructing a medium-deep foundation pit support component based on BIM technology is characterized by comprising the following steps:

[0054] Acquire measured data of the foundation pit site, construct a three-dimensional foundation pit model according to the measured data, analyze the soil structure of the foundation pit site to obtain soil structure data, and configure the soil structure model of the three-dimensional foundation pit model based on the soil structure data;

[0055] Read the flow section division data and earthwork calculation recorded during the foundation pit construction, and simulate the earthwork excavation based on the soil structure model according to the divided flow sections to obtain the deformation data of the soil structure caused by the earthwork excavation;

[0056] Performing secondary correction on the three-dimensional foundation pit model based on the soil structure model according to the deformation data to obtain a foundation pit simulation model;

[0057] Using soil structure data to simulate the construction of the support structure of the foundation pit simulation model according to the designated water flow section to obtain preliminary simulation data, laying out the support structure model in the foundation pit simulation model according to the preliminary simulation data, and configuring the support structure model based on the corresponding configuration of the support structure model;

[0058] Performing a structural collision check on the supporting structure model in the foundation pit simulation model to obtain collision points among the supporting structure model, the foundation pit simulation model and the supporting structure model, and judging the rationality of the supporting structure model and the supporting structure model based on the spacing between the collision points to determine the layout data of the supporting structure model and the supporting structure model;

[0059] The layout data is used to guide the installation of medium and deep foundation pit support components on site.

[0060] Furthermore, the benchmark data for the survey of the medium-deep foundation pit is determined, and the elevation points or contour lines obtained through survey in the medium-deep foundation pit based on the benchmark data are used as the actual measured data of the foundation pit site.

[0061] Furthermore, the three-dimensional foundation pit model is divided into several flow sections according to the flow section division data, and the three-dimensional scanning data of the foundation pit excavation side at the foundation pit site in each flow section is obtained, and the three-dimensional scanning data of each flow section is encoded as the basic input of the soil structure model. By constructing a neural network model with multiple convolution channels, the soil structure is trained and analyzed to obtain the corresponding soil structure characteristics, and the soil structure characteristics are extracted to obtain the structure prediction model; the flow section division data and earthwork calculation recorded during the foundation pit construction are read, and a closed isosurface is generated for the structure prediction model to form a soil layer solid block, and the soil structure model is generated with the soil layer solid block as the benchmark.

[0062] Furthermore, the method of obtaining deformation data of soil structure deformation caused by earth excavation through earth excavation simulation includes:

[0063] Read the flow section division data recorded during the foundation pit construction, and divide the medium-deep foundation pit into several flow sections;

[0064] At least one of the water flow sections is selected as the monitoring section, and a number of displacement sensors are successively arranged outward along the edge of the excavation surface of the medium-deep foundation pit, and the displacement and strain data of the adjacent retaining wall structure during soil excavation are collected through the displacement sensors;

[0065] According to the displacement and strain data, the finite element analysis model is used to generate the deformation form of the foundation pit and the deformation value of the critical area;

[0066] The pit deformation morphology is obtained, the morphological features of the pit deformation morphology are extracted, and a deformation prediction model is generated based on the deformation value of the critical area corresponding to each morphological feature. The deformation prediction model is used to predict other flow sections in the medium-deep foundation pit to obtain the deformation data of the entire soil structure model.

[0067] Furthermore, the collision points between the foundation pit simulation model and the supporting structure model are used as a basis for determining the rationality of the supporting structure model and the supporting structure model, with the number of points with a spacing of less than 20 mm being less than or equal to 3.

[0068] The present invention further provides a medium-deep foundation pit support assembly, which is designed by using the above-mentioned medium-deep foundation pit support assembly construction method based on BIM technology, and comprises:

[0069] Base plate models are arranged on opposite sides of the side walls of the foundation pit in the foundation pit simulation model;

[0070] The drainage capacity of the side of the base plate model adjacent to the soil structure model is simulated based on the measured data and soil structure data of the foundation pit site corresponding to the foundation pit simulation model, and the drainage capacity data is calculated;

[0071] According to the drainage capacity data, a plurality of drainage hole units are provided on the substrate model along a preset installation spacing;

[0072] A support structure model is arranged between the relative base plate models in the foundation pit simulation model, and the support structure model includes:

[0073] A plurality of fixed rod assemblies, wherein the fixed rod assemblies include a first rod unit and a second rod unit that are slidably connected along the axial direction thereof, the opposite ends of the first rod unit and the second rod unit are respectively extended to be connected to the base plate model located on the opposite sides of the side wall of the foundation pit model, and the adjacent ends of the first rod unit and the second rod unit are provided with locking member assemblies, and the locking member assemblies are used to reversely lock the fixed rod assembly when it is stretched;

[0074] A fixing component assembly is disposed between two adjacent groups of the base plate models, and is used to drive the two adjacent groups of the base plate models to move in opposite directions to fit closely with the opposite sides of the side walls of the foundation pit model, and to stretch the fixing rod assembly to synchronously fix the base plate models;

[0075] At least two anchor rod assemblies, the interior of the anchor rod assembly is a hollow structure, and a filling unit is arranged in the anchor rod assembly, a plurality of groups of water inlet hole units are opened on the outer periphery of the anchor rod assembly, one end of the anchor rod assembly is extended to the surrounding area with an end unit, and the end of the anchor rod assembly close to the end unit is opened with a drainage hole unit, the end of the anchor rod assembly away from the end unit passes through the drainage hole unit and is inserted into the side wall of the foundation pit model, the anchor rod assembly is used to fix and limit the installation position of the base plate model and collect water in the soil around the foundation pit model into the anchor rod assembly through the water inlet hole unit and discharge it from the drainage hole unit.

[0076] Furthermore, each two fixing rod assemblies between two adjacent groups of substrate models are provided with a group of fixing member assemblies, and the fixing member assemblies include:

[0077] A first connecting plate unit, two opposite sides of which extend to connect with the outer peripheries of the first rod body units of the two fixing rod assemblies;

[0078] A second connecting plate unit, two opposite sides of which extend to connect with the outer peripheries of the second rod body units of the two fixing rod assemblies;

[0079] A driving member assembly connects the first connecting plate unit and the second connecting plate unit to drive the first connecting plate unit and the second connecting plate unit to move in opposite directions to achieve stretching or contraction of the fixing rod assembly.

[0080] Furthermore, the driving member includes a screw unit, the outer periphery of which is threadedly connected to any one of the first connecting plate unit and the second connecting plate unit, one end of which extends to be rotatably connected to the remaining one of the first connecting plate unit and the second connecting plate unit, and the other end extends to a side away from the rotating part of the screw unit and is provided with a control unit, and the control unit is used to control the rotation of the screw unit to adjust the distance between the first connecting plate unit and the second connecting plate unit.

[0081] Furthermore, the locking member assembly comprises:

[0082] A rack unit, arranged at one end of the first rod unit;

[0083] A slide unit is provided at one end of the second rod unit and is slidably connected to the rack unit;

[0084] A pawl unit is arranged on one side of the opening of the slide slot unit, one end of which is rotatably mounted on the end of the second rod unit through a torsion spring, and the other end is engaged with the rack unit, so as to lock the fixed rod assembly when the first rod unit and the second rod unit are close to each other.

[0085] Furthermore, two adjacent groups of the substrate models are plug-connected;

[0086] A slot unit is provided on the edge side of one group of the base plate models, and a side of the slot unit close to the fixing component assembly has a guide port unit opened toward both sides;

[0087] Another group of the base plate models is provided with a cylindrical plug-in unit toward the edge of the slot unit. The position of the plug-in unit is adapted to the slot unit, and the axial direction of the plug-in unit is perpendicular to the opening direction of the guide port unit.

[0088] The present invention can not only effectively simulate the deformation data of the foundation pit simulation model caused by the construction process through modeling, but also reasonably arrange the support structure model according to the construction simulation to enhance the scientificity and rationality of the construction.

[0089] A foundation pit simulation model is constructed, and the support structure construction simulation is performed on the foundation pit simulation model according to the designated flow section based on the soil structure data to obtain preliminary simulation data. The support structure model is laid out in the foundation pit simulation model according to the preliminary simulation data, and a support structure model is configured based on the corresponding configuration of the support structure model; a structural collision check is performed on the support structure model in the foundation pit simulation model to obtain the collision points between the support structure model, the foundation pit simulation model and the support structure model, and the rationality of the support structure model and the support structure model is determined based on the distance between the collision points to determine the layout data of the support structure model and the support structure model; the layout data is used to guide the installation of medium and deep foundation pit support components on site.

[0090] Under the guidance of the present invention, the support component model not only reduces the degree of damage to the foundation pit wall during the construction process compared with the previous construction method of using steel sections for positioning and installation, but also the installation position of each group of base plate models can be adjusted at will during the construction process to match the base of the foundation pit model for positioning and installation, and there is no need to perform secondary hole drilling on the base plate, which significantly reduces the construction difficulty and construction cost. At the same time, the support component model has retractable adjustment and automatic locking functions, which can be adaptively adjusted according to the width of the foundation pit, and during the adjustment process, there is no need to use any auxiliary facilities to reversely fix it after stretching to prevent shrinkage, which can improve construction efficiency and has low use cost; at the same time, by setting the anchor rod assembly, not only the installation position of the base plate model can be fixed and limited, but also the groundwater in the soil around the foundation pit model can be discharged to maintain the soil environment around the foundation pit.

[0091] Example 2

[0092] Example 2 is based on Example 1 as a guide to design and install medium-deep foundation pit support components during on-site construction.

[0093] See also Figure 5 As shown, the present invention provides a medium-deep foundation pit support assembly, which includes a base plate 1 arranged on opposite sides of the foundation pit side wall, a plurality of drainage holes 2 opened on the base plate 1 along a preset installation interval, a plurality of fixing rods 3, a fixing member 6 and at least two anchor rods 8, wherein the fixing rod 3 includes a first rod body 4 and a second rod body 5 slidably connected along its axial direction, and the opposite ends of the first rod body 4 and the second rod body 5 are respectively extended to be connected with the base plate 1 located on opposite sides of the foundation pit side wall, and the adjacent ends of the first rod body 4 and the second rod body 5 are provided with a locking member 7, and the locking member 7 is used to reversely lock the fixing rod 3 when it is stretched, so as to be fixed on the base plate 1 During the installation process, when the base 1 is gradually moved closer to the side wall of the foundation pit, the fixing rod 3 is automatically locked by the locking member 7. The fixing rod 3 has a telescopic function, but there is no need to use any auxiliary facilities to fix it in the reverse direction after stretching it to prevent it from retracting, which can improve the construction efficiency and has low cost. The fixing member 6 is arranged between two adjacent groups of base plates 1. The fixing member 6 is used to drive the two adjacent groups of base plates 1 to move in opposite directions until they are tightly fitted with the opposite sides of the side wall of the foundation pit, and to stretch the fixing rod 3 to synchronously fix the base plates 1, so as to facilitate the application of pre-tightening force to the base plates 1 to prevent the existence of an installation gap between the base plates 1 and the side wall of the foundation pit, which helps to enhance the support effect. Figure 6As shown, the interior of the anchor rod 8 is a hollow structure, and a filler is arranged inside the anchor rod 8. The filler can avoid soil loss when discharging groundwater and maintain the soil environment around the foundation pit; a plurality of groups of water inlet holes 9 are opened on the outer periphery of the anchor rod 8, and an end 11 is extended to the surroundings at one end of the anchor rod 8, so that the operator can use auxiliary tools such as a hammer to nail the anchor rod 8 into the side wall of the foundation pit to fix and limit the base plate 1, and at the same time facilitate the subsequent disassembly and replacement of the anchor rod 8, which can reduce labor intensity to prevent the soil from being too hard and causing the anchor rod 8 to be unable to be manually inserted; and a drainage hole 10 is opened at the end of the anchor rod 8 close to the end 11, and the end of the anchor rod 8 away from the end 11 passes through the drainage hole 2 and is inserted into the side wall of the foundation pit. The anchor rod 8 is used to fix and limit the installation position of the base plate 1 and collect water in the soil around the foundation pit through the water inlet holes 9 into the anchor rod 8 and discharge it from the drainage hole 10.

[0094] In the above, if Figure 6 As shown, when the workers build the support assembly around the foundation pit, they first pre-select the corresponding number of base plates 1, fixing rods 3, fixing parts 6 and anchor rods 8 according to the depth and length of the foundation pit, and splice the base plates 1, fixing rods 3 and fixing parts 6 into an integrated structure at the construction site based on the width of the foundation pit to obtain multiple sets of integrated support modules with adjustable widths. Then, the bottom of the foundation pit is leveled to install several sets of integrated support modules at the bottom of the foundation pit to complete the overall positioning construction of the support assembly. During the construction process, the base plate 1 is fixed to the side wall of the foundation pit by the anchor rods 8 to prevent the base plate 1 from The remaining integrated support modules can be assembled from the bottom of the foundation pit upwards in sequence after being dislocated. Compared with the previous construction method of using steel sections for positioning and installation, this support assembly not only reduces the degree of damage to the pit wall, but also allows the installation position of each group of base plates 1 to be adjusted at will during the construction process to match the base of the foundation pit for positioning and installation, and there is no need to perform secondary hole drilling on the base plate 1, which significantly reduces the construction difficulty and construction cost. At the same time, the support assembly has an automatic locking function, and there is no need to use locking structures such as nuts for fixing, thereby improving construction efficiency.

[0095] Furthermore, if Figure 6 The filler shown includes a fine sand layer 12 and a filter layer 13 arranged in sequence around the central axis direction of the anchor rod 8; the filter layer 13 is a hollow cylindrical structure, which is used to wrap the fine sand layer 12 and then fill it into the anchor rod 8 to prevent the fine sand layer 12 inside the anchor rod 8 from flowing out from the water inlet hole 9 or the drainage hole 10 during the transportation of the anchor rod 8, thereby ensuring the normal use of the anchor rod 8.

[0096] Furthermore, if Figure 3As shown, each two fixing rods 3 between two adjacent groups of base plates 1 are provided with a group of fixing members 6, and the fixing members 6 include a first connecting plate 14, a second connecting plate 15 and a driving member, and the opposite sides of the first connecting plate 14 extend to connect with the outer periphery of the first rod bodies 4 of the two fixing rods 3 respectively to reinforce the first rod bodies 4; the opposite sides of the second connecting plate 15 extend to connect with the outer periphery of the second rod bodies 5 of the two fixing rods 3 respectively to reinforce the second rod bodies 5; the driving member connects the first connecting plate 14 and the second connecting plate 15 to drive the first connecting plate 14 and the second connecting plate 15 to move in opposite directions to achieve stretching or contraction of the fixing rods 3. Specifically, the driving member includes a screw rod 16, the outer periphery of which is threadedly connected to any one of the first connecting plate 14 and the second connecting plate 15, one end of which extends to be rotatably connected to the remaining one of the first connecting plate 14 and the second connecting plate 15, and the other end extends to a side away from the rotating portion of the screw rod 16 and is provided with a control member 17. The control member 17 is used to control the rotation of the screw rod 16 to adjust the spacing between the first connecting plate 14 and the second connecting plate 15, so as to install the substrate 1 on the side wall of the foundation pit after the fixing rod 3 is stretched. The screw rod 16 is driven by the control member 17 to drive the first connecting plate 14 and the second connecting plate 15 to move toward the side away from each other, so as to press the substrate 1 against the side wall of the foundation pit, and at the same time stretch the fixing rod 3 to the maximum length in the current state, so as to install the substrate 1 in place with the help of external force to reduce labor intensity. Among them, the rotating part of the screw 16 is detachably connected to the first connecting plate 14 or the second connecting plate 15, so that the rotating part of the screw 16 can be removed before the substrate 1 approaches the foundation pit, so that the load of the control component 17 can be reduced when the screw 16 is driven to rotate, and when the substrate 1 is fixed to the side wall of the foundation pit by the anchor rod 8, the substrate 1 can be prevented from being subjected to the axial tension of the screw 16, and the substrate 1 can be ensured to move toward the side wall of the foundation pit under the thrust of the anchor rod 8. In this embodiment, the control component 17 is set as a handle or a motor. It should be noted that in order to improve the installation strength, a motor can be used to drive the screw 16 to rotate, such as Figure 4 As shown, the frame of the motor can be detachably mounted on the first connecting plate 14, so that after one group of substrates 1 is fixed in place, the motor can be removed to fix and install other substrates 1.

[0097] In the above, if Figure 3 As shown, the end of the screw rod 16 is rotatably connected to a polygonal positioning plate, and a slot matching the polygonal positioning plate is provided on one side of the second connecting plate 15 close to the screw rod 16. During use, the screw rod 16 and the second connecting plate 15 are positioned and installed by inserting the polygonal positioning plate into the slot.

[0098] In this embodiment, during the installation of each group of support components, one group of base plates 1 can be first fixed on the side wall of the foundation pit, and then the installation distance between the other group of base plates 1 and the side wall of the foundation pit can be adjusted.

[0099] Furthermore, if Figure 7 As shown, the locking member 7 includes a rack 18, a slide 19 and a pawl 20. The rack 18 is arranged at one end of the first rod 4; the slide 19 is opened at one end of the second rod 5 and is slidably connected with the rack 18; the pawl 20 is arranged on one side of the opening of the slide 19, one end of which is rotatably mounted on the end of the second rod 5 through a torsion spring, and the other end is meshed with the rack 18, and is used to lock the fixed rod 3 when the first rod 4 and the second rod 5 are close to each other. Specifically, in order to prevent the pawl 20 from being out of engagement with the second rack 18 due to the excessive output of the driving member, at least one set of torsion springs is arranged along the rotation axis of the pawl 20, so as to rotatably connect the rotation axis of the pawl 20 with the end of the second rod 5 through the torsion spring, thereby ensuring that the pawl 20 is always in engagement with the second rack 18 under the tensioning force of the torsion spring.

[0100] Furthermore, the fixing rod 3 is detachably connected to the base plate 1, which is convenient for replacing fixing rods 3 or base plates 1 of different sizes according to construction conditions, and replacing damaged fixing rods 3 or base plates 1, which can save construction costs. Specifically, the base plate 1 is provided with a plurality of positioning holes 21 for the ends of the fixing rods 3 to pass through, and the ends of the fixing rods 3 are connected to the fastening nuts 22 through the positioning holes 21; the fastening nuts 22 are embedded in the positioning holes 21, and the length of the fixing rods 3 can be appropriately adjusted to enhance the adaptability of the fixing rods 3.

[0101] In the above, if Figure 3 , Figure 5 and Figure 7 As shown, the shape and size of the positioning hole 21 are respectively adapted to the shape and size of the fastening nut 22, so that after the fastening nut 22 is installed in the positioning hole 21, the end of the fixing rod 3 is screwed into the fastening nut 22 by rotating the fixing rod 3, thereby realizing the assembly of the fixing rod 3 and the substrate 1. In this embodiment, the four corners of the substrate 1 are respectively provided with fixing rods 3. When the side wall of the foundation pit is uneven, the spacing between the corners of the substrate 1 can be adjusted by rotating the fixing rod 3 to fine-tune the installation spacing of the substrate 1, thereby ensuring that the substrate 1 is effectively in contact with the side wall of the foundation pit. It should be noted that the direction selection design of the spiral lines at both ends of the fixing rod 3 is the same, so as to ensure that when the fixing rod 3 is rotated, the fastening nuts 22 on both sides thereof can be screwed into the fixing rod 3 in opposite directions.

[0102] Furthermore, if Figure 3As shown, two adjacent groups of substrates 1 are plug-connected; a slot 23 is provided on the edge of one group of substrates 1, and a guide opening 24 is provided on the side of the slot 23 close to the fixing member 6; a cylindrical plug block 25 is provided on the edge of the other group of substrates 1 facing the slot 23, and the position of the plug block 25 is adapted to the slot 23, and the axial direction of the plug block 25 is perpendicular to the opening direction of the guide opening 24. It is convenient to position and install the two adjacent groups of substrates 1 to eliminate installation errors; at the same time, it is also possible to assemble multiple integrated support modules in the foundation pit into a support assembly of an integrated structure, so as to subdivide the support assembly into multiple splicing modules for on-site splicing and assembly, which can not only reduce transportation costs, but also be applicable to supporting foundation pits of different sizes, thereby improving the applicability of the support assembly.

Claims

1. A method for constructing medium-deep foundation pit support components based on BIM technology, characterized in that: The steps include: Acquire measured data of the foundation pit site, construct a three-dimensional foundation pit model according to the measured data, analyze the soil structure of the foundation pit site to obtain soil structure data, and configure the soil structure model of the three-dimensional foundation pit model based on the soil structure data; Read the flow section division data and earthwork calculation recorded during the foundation pit construction, and simulate the earthwork excavation based on the soil structure model according to the divided flow sections to obtain the deformation data of the soil structure caused by the earthwork excavation; Performing secondary correction on the three-dimensional foundation pit model based on the soil structure model according to the deformation data to obtain a foundation pit simulation model; Using soil structure data to simulate the construction of the support structure of the foundation pit simulation model according to the designated water flow section to obtain preliminary simulation data, laying out the support structure model in the foundation pit simulation model according to the preliminary simulation data, and configuring the support structure model based on the corresponding configuration of the support structure model; Performing a structural collision check on the supporting structure model in the foundation pit simulation model to obtain collision points among the supporting structure model, the foundation pit simulation model and the supporting structure model, and judging the rationality of the supporting structure model and the supporting structure model based on the spacing between the collision points to determine the layout data of the supporting structure model and the supporting structure model; The layout data is used to guide the installation of medium and deep foundation pit support components on site.

2. The method for constructing a medium-deep foundation pit support assembly based on BIM technology according to claim 1 is characterized in that: The benchmark data for the medium-deep foundation pit survey is determined, and the elevation points or contour lines obtained through survey in the medium-deep foundation pit based on the benchmark data are used as the actual measured data of the foundation pit site.

3. The method for constructing a medium-deep foundation pit support assembly based on BIM technology according to claim 1, characterized in that: The three-dimensional foundation pit model is divided into several flow sections according to the flow section division data, and the three-dimensional scanning data of the foundation pit excavation side at the foundation pit site in each flow section is obtained. The three-dimensional scanning data of each flow section is encoded as the basic input of the soil structure model. By constructing a neural network model with multiple convolution channels, the soil structure is trained and analyzed to obtain the corresponding soil structure characteristics, and the soil structure characteristics are extracted to obtain the structure prediction model; the flow section division data and earthwork calculation recorded during the foundation pit construction are read, and a closed isosurface is generated for the structure prediction model to form a soil layer solid block, and the soil structure model is generated with the soil layer solid block as the benchmark.

4. The method for constructing a medium-deep foundation pit support assembly based on BIM technology according to claim 1, characterized in that: Methods for obtaining deformation data of soil structure deformation caused by earth excavation through earth excavation simulation include: Read the flow section division data recorded during the foundation pit construction, and divide the medium-deep foundation pit into several flow sections; At least one of the water flow sections is selected as the monitoring section, and a number of displacement sensors are successively arranged outward along the edge of the excavation surface of the medium-deep foundation pit, and the displacement and strain data of the adjacent retaining wall structure during soil excavation are collected through the displacement sensors; According to the displacement and strain data, the finite element analysis model is used to generate the deformation form of the foundation pit and the deformation value of the critical area; The pit deformation morphology is obtained, the morphological features of the pit deformation morphology are extracted, and a deformation prediction model is generated based on the deformation value of the critical area corresponding to each morphological feature. The deformation prediction model is used to predict other flow sections in the medium-deep foundation pit to obtain the deformation data of the entire soil structure model.

5. The method for constructing a medium-deep foundation pit support assembly based on BIM technology according to claim 1, characterized in that: The collision points between the foundation pit simulation model and the supporting structure model are less than or equal to 3 points with a spacing of less than 20 mm, which are used as the basis for judging the rationality of the supporting structure model and the supporting structure model.

6. A medium-deep foundation pit support assembly, designed by using the medium-deep foundation pit support assembly construction method based on BIM technology according to claims 1-5, characterized in that: include: Base plate models are arranged on opposite sides of the side walls of the foundation pit in the foundation pit simulation model; The drainage capacity of the side of the base plate model adjacent to the soil structure model is simulated based on the measured data and soil structure data of the foundation pit site corresponding to the foundation pit simulation model, and the drainage capacity data is calculated; According to the drainage capacity data, a plurality of drainage hole units are provided on the substrate model along a preset installation spacing; A support structure model is arranged between the relative base plate models in the foundation pit simulation model, and the support structure model includes: A plurality of fixed rod assemblies, wherein the fixed rod assemblies include a first rod unit and a second rod unit that are slidably connected along the axial direction thereof, the opposite ends of the first rod unit and the second rod unit are respectively extended to be connected to the base plate model located on the opposite sides of the side wall of the foundation pit model, and the adjacent ends of the first rod unit and the second rod unit are provided with locking member assemblies, and the locking member assemblies are used to reversely lock the fixed rod assembly when it is stretched; A fixing component assembly is disposed between two adjacent groups of the base plate models, and is used to drive the two adjacent groups of the base plate models to move in opposite directions to fit closely with the opposite sides of the side walls of the foundation pit model, and to stretch the fixing rod assembly to synchronously fix the base plate models; At least two anchor rod assemblies, the interior of the anchor rod assembly is a hollow structure, and a filling unit is arranged in the anchor rod assembly, a plurality of groups of water inlet hole units are opened on the outer periphery of the anchor rod assembly, one end of the anchor rod assembly is extended to the surrounding area with an end unit, and the end of the anchor rod assembly close to the end unit is opened with a drainage hole unit, the end of the anchor rod assembly away from the end unit passes through the drainage hole unit and is inserted into the side wall of the foundation pit model, the anchor rod assembly is used to fix and limit the installation position of the base plate model and collect water in the soil around the foundation pit model into the anchor rod assembly through the water inlet hole unit and discharge it from the drainage hole unit.

7. A medium-deep foundation pit support assembly according to claim 1, characterized in that: Each two fixing rod assemblies between two adjacent groups of substrate models are provided with a group of fixing member assemblies, and the fixing member assemblies include: A first connecting plate unit, two opposite sides of which extend to connect with the outer peripheries of the first rod body units of the two fixing rod assemblies; A second connecting plate unit, two opposite sides of which extend to connect with the outer peripheries of the second rod body units of the two fixing rod assemblies; A driving member assembly connects the first connecting plate unit and the second connecting plate unit to drive the first connecting plate unit and the second connecting plate unit to move in opposite directions to achieve stretching or contraction of the fixing rod assembly.

8. A medium-deep foundation pit support assembly according to claim 7, characterized in that: The driving member includes a screw unit, the outer periphery of which is threadedly connected to any one of the first connecting plate unit and the second connecting plate unit, one end of which extends to be rotatably connected to the remaining one of the first connecting plate unit and the second connecting plate unit, and the other end extends to a side away from the rotating part of the screw unit and is provided with a control unit, and the control unit is used to control the rotation of the screw unit to adjust the distance between the first connecting plate unit and the second connecting plate unit.

9. A medium-deep foundation pit support assembly according to claim 6, characterized in that: The locking member assembly comprises: A rack unit, arranged at one end of the first rod unit; A slide unit is provided at one end of the second rod unit and is slidably connected to the rack unit; A pawl unit is arranged on one side of the opening of the slide slot unit, one end of which is rotatably mounted on the end of the second rod unit through a torsion spring, and the other end is engaged with the rack unit, so as to lock the fixed rod assembly when the first rod unit and the second rod unit are close to each other.

10. A medium-deep foundation pit support assembly according to claim 6, characterized in that: Two adjacent groups of substrate models are plug-connected; A slot unit is provided on the edge side of one group of the base plate models, and a side of the slot unit close to the fixing component assembly has a guide port unit opened toward both sides; Another group of the base plate models is provided with a cylindrical plug-in unit toward the edge of the slot unit. The position of the plug-in unit is adapted to the slot unit, and the axial direction of the plug-in unit is perpendicular to the opening direction of the guide port unit.

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