Rapid design method for supporting structure of bearing platform foundation pit

Abstract

The invention discloses a rapid design method for a bearing platform foundation pit supporting structure. The rapid design method comprises the following steps that a bearing platform pile foundation object in a bridge structure is established through a BIM system; a bearing platform pile foundation object is selected, a supporting facade arrangement object group, a supporting plane arrangement object group, a supporting structure facade detail drawing object and a supporting structure design management object are established, so that a BIM model of bearing platform foundation pit supporting structure design is rapidly constructed, and design schemes of supporting piles and an inner supporting structure of a supporting structure are conveniently expressed. And the calculation of the strength, rigidity and stability of the two-dimensional / three-dimensional structure of the supporting structure is conveniently completed, so that a design detail drawing and an engineering quantity table of the supporting structure are obtained. According to the method, simplification, standardization and high efficiency of bridge bearing platform supporting structure design are achieved, and the method can be suitable for supporting pile types such as steel sheet piles, profile steel piles, lock catch steel pipe piles and concrete piles and can also be suitable for design of similar foundation pits of other buildings.

Description

Technical Field

[0001] The invention relates to a construction method of a bridge project, in particular to a rapid design method for a foundation pit support structure of a cap. Background Art

[0002] In bridge construction, a large number of foundation pits are involved, which accounts for a large economic volume in bridge construction. The corresponding digital technology for foundation pit support structure design is an important part of the overall technical system of bridge construction digitalization. At present, although the foundation pit support structure of the foundation can be completed with the assistance of some software tools, from the perspective of key design processes such as scheme comparison, structural calculation, drawing, and engineering quantity calculation, the current software tools are still difficult to collaboratively complete the key design process of the foundation pit support structure design of the foundation. The information flow of each design link is poor, which limits the full exploration of the design efficiency of the support structure.

[0003] BIM (Building Information Modeling) technology is a technology for building and applying models that uses graphics as a carrier and can load or associate a large amount of relevant engineering information. This technology is a key technology in the field of digital technology in intelligent bridge construction technology.

[0004] CN119337486A discloses a rapid design method for a beam-column bracket based on a functional graphic object. The method first establishes a basic graphic object in an interactive drawing system; then, by establishing a longitudinal arrangement object group and a transverse arrangement object group of the beam-column bracket, the longitudinal arrangement scheme and the transverse arrangement scheme of the steel pipe column are modified, thereby establishing a rod finite element calculation model to calculate the maximum number of required main load-bearing beams; by dividing the main beam reference section into equal load areas, a plane layout diagram including large beams, small beams and main load-bearing beams, a plane layout diagram of the steel pipe column foot plane and the concrete strip foundation plane, etc. are established; by establishing a rod finite element calculation model for the designed beam-column bracket, the mechanical calculation result of the beam-column bracket is calculated, and finally a table of engineering quantities of the beam-column bracket design scheme is formed. This rapid design method for a beam-column bracket can quickly realize the scheme design and mechanical calculation of the beam-column bracket by creating and operating a two-dimensional functional graphic object, and quickly obtain construction details and engineering quantities.

[0005] However, since the foundation pit support structure and the beam-column support belong to different structural systems, have different design features, and express the design features completely differently, it is not possible to use or refer to the rapid design method of the beam-column support to quickly design and calculate the foundation pit support structure. Therefore, in the existing bridge construction digital technology, there is still a lack of support for the design, calculation, quantity calculation, and output of the foundation pit support structure of the bridge foundation. Figure 1 Integrated solution. Summary of the invention

[0006] The purpose of the present invention is to provide a rapid design method for a foundation pit supporting structure of a bridge pedestal, so as to overcome the shortcomings of the prior art and realize the integration of design, calculation, quantity calculation and drawing of the foundation pit supporting structure of a bridge pedestal.

[0007] The object of the present invention is achieved in that: A rapid design method for a foundation pit support structure comprises the following steps: S1. Based on the design data of the bridge structure, use the BIM system to establish the pile foundation object in the bridge structure.

[0008] S2. Given the static distance from the edge of the cap plane and the inner edge of the support pile plane to the edge of the cap, establish the support facade layout object group, support plane layout object group, support facade layout detail object and support structure design management object through the cap pile foundation object.

[0009] S3. By modifying the attribute information of the support structure design management object, or by editing the objects in the support facade layout object group, a support facade layout object group that meets the on-site hydrogeological requirements is obtained; according to the number of internal supporting facades, an equal number of support plane layout object groups are obtained by copying or deleting.

[0010] S4. By setting the static spacing from the inner edge of the support pile plane to the edge of the foundation plane, a support plane layout object group that meets the static spacing requirements is obtained.

[0011] S5. Set the cross-sectional specifications and layout attribute information of the braces and diagonal braces on the inner support plane objects in each support plane layout object group to obtain the required inner support plane objects.

[0012] S6. According to the support facade arrangement object group obtained in step S3 and the internal support plane object obtained in step S5, the internal support structure in the support structure is structurally calculated, and then the overall stability, embedded stability and mechanical calculation of the foundation pit support and anti-uplift of the foundation pit support are respectively performed.

[0013] S7. Repeat steps S4-S6 until mechanical calculation results that meet technical specifications are obtained and a calculation report is generated.

[0014] S8. According to the support facade layout object group and each support plane layout object group, set the backfill parameters of concrete or soil, and establish the support facade layout detail objects corresponding to each working condition from the installation of the internal support structure step by step to the entire demolition process.

[0015] S9. In each support plane layout object group, respectively set the corbel support layout information, angle brace layout information, ring beam reinforcement rib layout information and adjustment joint layout information of braces and diagonal braces, and establish the design details of the ring beam, brace and diagonal brace in each internal support structure; and according to the support elevation layout object group and each support plane layout object group, establish the engineering number drawing quantity table of the internal support structure and support piles.

[0016] Furthermore, the present invention further comprises the following steps: S10. Supplement local details to the design details of the ring beam, brace and diagonal brace of each internal supporting structure to complete the design details of the foundation pit support structure.

[0017] Furthermore, in step S5, when the required internal support plane object cannot be obtained by setting the attribute information or by modifying the attribute information, the internal support plane object is first decomposed into independent rod objects including ring beams, braces and diagonal braces, and then the required rod objects including ring beams, braces and diagonal braces are established by drawing and editing the rod objects. Finally, the established rod objects are combined and forcibly converted into the required internal support plane object.

[0018] The present invention is implemented by creating and operating functional graphic objects. Functional graphic objects have the following basic characteristics: 1. Functional graphic objects are two-dimensional geometric graphic objects in the graphics system, similar to block objects in AutoCAD, which can be selected, moved, copied, enlarged, reduced and other geometric operations. However, they are different in that they require customized engineering attribute information and professional functions for functional objects. The operation interface of functional graphic objects can be activated by the mouse, and the relevant attribute information or parameter information of the functional graphic objects and some operation buttons for realizing professional functions are displayed on the operation interface. By clicking the relevant button operations, the professional functions of the functional graphic objects can be realized, and the corresponding operations are the professional operations of the functional graphic objects. Therefore, functional graphic objects are also an information model in the graphics system.

[0019] 2. Functional graphic objects can be obtained through parameterization and forced conversion methods. For simple functional graphic objects, they can be realized through parameterization methods, that is, the required functional graphic objects can be created by entering several parameters. For complex functional graphic objects, forced conversion methods can be used to realize them.

[0020] 3. The forced conversion method is a basic method for converting a geometric object into a functional graphic object with engineering attributes and professional functions. The basic steps of the forced conversion method are: first draw a geometric object using the interactive geometric drawing and editing method; then load or associate the relevant engineering data in the graphic data of the geometric object through mouse operation, and provide corresponding professional functions.

[0021] 4. The functional graphic object itself is a kind of graphic data, which contains data reflecting its geometric shape and data reflecting its engineering characteristics. It can be identified and extracted to perform corresponding engineering calculations.

[0022] The present invention belongs to a method for editing the properties of a functional graphic object. For an established functional graphic object, the property information of the functional graphic object can be set through its operation interface to obtain the required functional graphic object and display status.

[0023] The present invention quickly constructs a key BIM model for the design of a foundation pit support structure by establishing functional graphic objects such as a support facade layout object group, a support plane layout object group, and a support structure facade detail object in a graphic system, conveniently expresses the design scheme of the support piles and the internal support structure of the support structure, quickly completes the strength, stiffness and stability calculations of the two-dimensional / three-dimensional structure of the support structure, and the relevant stability calculations required by the specifications, quickly obtains the design details and engineering quantity table of the foundation pit support structure of the foundation, realizes the simplification, standardization and high efficiency of the design of the bridge foundation pit support structure, is beneficial to the refined management and control of bridge engineering construction projects, and is beneficial to the potential tapping and efficiency improvement of construction companies.

[0024] The present invention adopts BIM technology to conveniently express the design scheme of supporting piles and internal supporting structures of the supporting structure by establishing functional graphic objects such as supporting facade layout object group, supporting plane layout object group and supporting structure facade detail object in the graphic system, and complete the strength, stiffness and stability calculation of the two-dimensional / three-dimensional structure of the supporting structure, as well as the relevant stability calculation required by the specification, and quickly obtain the design details and engineering quantity table of the supporting structure, so as to simplify, standardize and efficiently design the supporting structure of the bridge pedestal, and facilitate the refined management and control of bridge engineering construction projects and the potential tapping and efficiency improvement of construction enterprises.

[0025] The invention has good adaptability and can adapt to supporting pile types such as steel sheet piles, steel piles, locking steel pipe piles, concrete piles, etc. It can also be adapted to the design of supporting structures similar to foundation pits of other buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1These are the three views of the pile foundation object; (a) is the main view, (b) is the top view, and (c) is the left view.

[0027] Figure 2 It is a schematic diagram of the support facade arrangement object group.

[0028] Figure 3 It is a schematic diagram of the support plane layout object group.

[0029] Figure 4 It is a schematic diagram of the support facade layout detail object.

[0030] Figure 5 It is a schematic diagram of the support structure design management objects.

[0031] Figure 6 It is a schematic diagram of the foundation pit soil layer object.

[0032] Figure 7 It is a schematic diagram of a fully uniformly distributed load object.

[0033] Figure 8 It is a schematic diagram of a strip uniformly distributed load object.

[0034] Fig. 9 It is a schematic diagram of a rectangular uniformly distributed load object.

[0035] Fig.10 It is a schematic diagram of a water level mark object.

[0036] Fig.11 It is a schematic diagram of the internal support plane object.

[0037] Fig.12 It is a design detail drawing of the inner support plane object with inner support plane, corbel plane and support pile plane.

[0038] Fig.13 It is a design detail drawing of the internal support plane object with rib plane and ribbed plane.

[0039] Fig.14 It is a structural schematic diagram of various planar rods of the internal support structure.

[0040] Fig.15 are structural schematic diagrams of various joints; among them, (a) is the structural schematic diagram of the first type of bracing joint; (b) is the structural schematic diagram of the second type of bracing joint; (c) is the structural schematic diagram of the diagonal bracing joint; (d) is the structural schematic diagram of a bracing joint assembled from multiple joints; (e) is the structural schematic diagram of a diagonal bracing joint assembled from multiple joints.

[0041] Fig.16 It is a structural diagram of the inner supporting corbel.

[0042] Fig.17 It is a schematic diagram of the structure of the rod; among them, (a) is the elevation view of the rod; (b) is the plan view of the rod; and (c) is the cross-sectional view of the rod.

[0043] In the figure: G is the support pile elevation object; S is the internal support elevation object; C is the pedestal elevation object; D is the bottom concrete elevation object; Q1 is the full uniform load; Q2 is the rectangular uniform load; Q3 is the strip uniform load; W is the water level mark object; H is the foundation pit soil layer elevation object; Gp is ​​the support pile plane object group; T1 is the pedestal plane object; WL is the internal support plane object; L is the boundary line between the active area and the passive area; d is the foundation pit soil layer elevation object; Dis is the boundary line distance; QL is the ring beam; DC is the brace; XC is the diagonal brace; NT is the corbel plane; JT is the joint plane; JB is the reinforcing rib. DETAILED DESCRIPTION

[0044] Two points: 1. In the process of using functional graphic objects to handle road and bridge construction technology, the representations of the various structural components involved in the graphic interface are all called "XX objects"; such as: "cap pile foundation object", "foundation pit soil layer object", "internal support plane object", "support facade layout detail object" and so on.

[0045] 2. The "preset interface" mentioned in the present invention refers to the preset operation interface in the graphic system or the operation interface of the functional graphic object.

[0046] The present invention also involves the following multiple professional terms, including cap pile foundation object, foundation pit soil layer elevation object, full uniform load object, strip uniform load object, rectangular uniform load object, water level mark object, support pile elevation object, support pile plane object, inner support elevation object, inner support plane object, support structure design management object, bottom cover concrete object, joint object, inner support corbel object, rod object and cap foundation pit elevation detail object. These professional terms are explained as follows: 1. The pile foundation object is a two-dimensional functional graphic object with the following basic features: 1. The cap pile foundation object is a functional graphic object composed of a plan view, an elevation view and a left view, and has attribute information such as the cap pile foundation name, cap height, and view display status.

[0047] 2. One method to establish a cap pile foundation model is to use a parametric method to construct a cap pile foundation object; another method is to first draw the geometric figure of the cap pile foundation plane, merge it into a whole figure, and then convert it into a cap pile foundation object, and then modify its attribute information on the preset interface to obtain the required cap pile foundation object.

[0048] 3. Select the cap pile foundation object, and by giving the cap plane and the static distance from the inner edge of the supporting pile plane to the cap edge, you can establish a support plane layout object group consisting of the inner support plane object, the cap pile foundation plane object and a series of supporting pile plane object groups, as well as a support facade layout object group consisting of the supporting pile facade object, foundation pit soil layer facade object, inner support facade object, cap facade object, water level mark object, full uniform load object, rectangular uniform load object, strip uniform load object and bottom concrete facade object; you can also establish support facade layout detail objects and support structure design management objects.

[0049] 2. The foundation pit soil layer elevation object is a two-dimensional functional graphic object with the following basic characteristics: 1. Figure 7 The d in the figure refers to the foundation pit soil layer elevation object. The foundation pit soil layer elevation object is also a symbol object, which is used to express the soil layer distribution and soil layer parameter information of the active and passive zones of the foundation pit soil layer. The graph shows the names of the soil layers in the active and passive zones, the soil layer boundary lines, the bulk density, cohesion, internal friction angle of each soil layer, and whether water and soil are calculated separately. It has attribute information such as ground elevation, foundation pit excavation depth, font display height, soil layer parameters in the active and passive zones, and soil layer slope parameters.

[0050] 2. The soil layer parameter information of the active zone and passive zone includes the name of each soil layer, soil layer thickness, soil layer bulk density, cohesion, internal friction angle, whether water and soil are calculated separately, floating bulk density, underwater internal friction angle, underwater cohesion, friction resistance with the anchor body, horizontal reaction force coefficient, proportional coefficient and other information.

[0051] 3. When the soil layer parameter information of the passive zone is empty, it means that the soil layer parameter information of the passive zone is consistent with the soil layer parameter information of the corresponding elevation position of the active zone.

[0052] 4. Soil layer slope parameters refer to the slope parameters of the ground in the active area, including the horizontal distance from the toe of the slope to the edge of the foundation pit, the slope height and the slope rate.

[0053] 5. In the preset interface, you can modify the attribute information of the foundation pit soil layer to obtain the required foundation pit soil layer object. The structure of the foundation pit soil layer object is as follows: Figure 6 shown.

[0054] 3. The uniformly distributed load object is a two-dimensional functional graphic object with the following basic characteristics: 1. The fully distributed uniform load object is arranged on the ground in the active area of ​​the foundation pit soil layer facade object, and its lower left endpoint is located at the boundary line of the foundation pit. It has attribute information such as uniform load value, load display height and font display height, which means that the foundation pit soil layer facade object bears a fully distributed uniform load in the active area. In the preset interface, you can change the size of the fully distributed uniform load by modifying the attribute information such as the load value. Figure 7 As shown, the fully uniformly distributed load object Q1 is arranged on the active area ground of the foundation pit soil layer facade object d.

[0055] 4. Strip uniform load object is a two-dimensional functional graphic object with the following basic characteristics: like Figure 8 As shown, the strip uniformly distributed load object Q2 is arranged on the active area of ​​the foundation pit soil layer elevation object d, and can be located at a certain position above the ground line or below the ground line of the active area. It has attribute information such as uniformly distributed load value, width of strip uniformly distributed load, load display height and font display height, which means that the foundation pit soil layer elevation object bears a strip uniformly distributed load in the active area. The attribute information of the strip uniformly distributed load object Q2 can be modified on the preset interface. Fig. 9 In the figure, the distance between the strip uniformly distributed load object Q2 and the foundation pit boundary line of the foundation pit soil layer elevation object d is Dis.

[0056] 5. The rectangular uniformly distributed load object is a two-dimensional functional graphic object with the following basic characteristics: like Fig. 9 As shown, the rectangular uniformly distributed load object Q3 is arranged on the active area of ​​the foundation pit soil layer elevation object d, and can be located at a certain position above the ground line or below the ground line of the active area. It has attribute information such as uniformly distributed load value, width and length of rectangular uniformly distributed load, load display height and font display height, which means that the foundation pit soil layer elevation object bears a rectangular uniformly distributed load in the active area. The attribute information of the rectangular uniformly distributed load object Q3 can be modified on the preset interface. Fig.10 In the figure, the distance between the rectangular uniformly distributed load object Q3 and the foundation pit boundary line of the foundation pit soil layer elevation object d is Dis.

[0057] 6. Water level mark object is a two-dimensional functional graphic object with the following basic features: like Fig.10 As shown in the figure, the water level mark object is a two-dimensional symbol object used to represent the water level elevation information of the active and passive areas of the foundation pit. When there is no water in the soil layer, the water level mark object needs to be deleted.

[0058] 7. The support pile elevation object is a two-dimensional functional graphic object with the following basic features: 1. The support pile elevation object is a functional graphic object with a rectangular shape and a certain fill shape or color. It is a characteristic symbol used to represent the support pile structure in the foundation pit support structure of the cap. It has attribute information such as pile width, pile length, pile type, suitable construction technical specification type, pile material, pile specification, unit length weight, moment of inertia and section moment.

[0059] 2. The types of supporting piles include steel sheet piles, steel sections, locking steel pipe piles and reinforced concrete piles.

[0060] 3. Pile specifications are related to pile types: for steel sheet piles, the pile specifications are the model of the steel sheet pile, such as IV and VI steel sheet piles; for steel support piles, the pile specifications are the specifications of the steel, such as I45a steel; for locking steel pipe piles, the pile specifications are the diameter and wall thickness of the steel pipe, etc.

[0061] 4. On the preset interface, you can modify the attribute information of the support pile facade object to obtain the required support pile facade object.

[0062] 8. The support pile plane object is a two-dimensional functional graphic object with the following basic features: 1. The support pile plane object is a functional graphic object used to express the cross section of the support pile. The specific geometric shape is related to the pile type and pile specifications of the support pile.

[0063] 2. The support pile plane object is established based on the support pile elevation object. According to the internal support plane object and the support pile elevation object, several support pile plane objects constrained by the boundary of the internal support plane object can be established. These several support pile plane objects form a series, which becomes a series of support pile plane objects.

[0064] 3. Based on the existing support pile plane objects, the required support pile plane objects can be established and obtained through operations such as deletion, copying, and moving.

[0065] 9. The internal support facade object is a functional graphic object with the following basic characteristics: 1. The internal support elevation object is a characteristic symbol object expressed by a rectangle, which is used to indicate the elevation layout position of the internal support structure in the supporting structure. It has attribute information such as the height of the rectangle display, the width of the rectangle display, the color of the rectangle display, the name of the associated internal support plane object, and the corresponding elastic stiffness.

[0066] 2. Elastic stiffness represents the elastic stiffness of the inner support structure on the supporting piles, and the corresponding elastic stiffness can be calculated through the corresponding inner support plane object.

[0067] 3. There are multiple independent inner support facade objects in the support facade layout object group. You can create multiple inner support facade objects by moving, deleting, copying, etc. One inner support facade object represents an inner support structure. The top inner support facade object corresponds to the first inner support structure, and the lower ones correspond to the second inner support structure, the third inner support structure, and so on. Each inner support facade object is associated with the corresponding inner support plane object through the name of the inner support plane object.

[0068] 4. On the preset interface, you can modify the attribute information of the internal support facade object to obtain the required internal support facade object.

[0069] 10. The internal support plane object is a functional graphic object with the following basic characteristics: 1. The internal support plane object is a functional graphic object used to express the internal support structure in the foundation pit support structure; there are as many corresponding internal support plane objects as there are internal support facade objects.

[0070] 2. If Fig.11 As shown in the figure, the inner support plane object is a plane bar structure composed of a ring beam QL, a brace DC and a diagonal brace XC. The inner support plane object can be established by parameterization or by forced conversion.

[0071] 3. The attribute information of the internal support plane object established in a parametric way includes the name of the internal support plane object, the plane outer contour size of the internal support structure, the specifications of each plane rod in the internal support structure, the design information of the uniformly distributed load transmitted by the supporting piles and the ring beam ribs, the layout information of the position of the internal support bracket and the parametric design information used for the design of the internal support plane object, etc.

[0072] 4. To create an internal support plane object by forced conversion, first decompose the internal support plane object created by parametric method into corresponding Fig.14 The plane bar objects such as the ring beam QL, diagonal brace XC, and opposite brace DC shown in the figure are then subjected to geometric or professional operations on the diagonal brace and opposite brace to obtain the plane bar objects that express the inner support plane objects. After combining these plane bar objects, the corresponding inner support plane objects are obtained through forced transformation. The inner support plane objects obtained through forced transformation have attribute information such as the name and the uniformly distributed load transmitted by the supporting piles.

[0073] 5. According to the established internal support plane object, a finite element calculation model of the rod of the internal support structure can be established on the preset interface. The support reaction force borne by the internal support structure from the calculation of the support piles is given as a uniformly distributed load to perform mechanical calculations on the internal support structure, thereby obtaining an evaluation result of the strength, stiffness and stability of the internal support structure.

[0074] 6. On the preset interface, by setting the joint names of the braces and diagonal braces and the layout spacing of the inner support brackets on the ring beam, you can create Fig.12 Design detail of the inner support plane object with the inner support plane, corbel plane, and stake plane shown.

[0075] 7. On the preset interface, by setting the joint names of the braces and diagonal braces, the thickness, spacing and number of the reinforcing ribs of the ring beam, you can create Fig.13 Design detail of the braced plane object with rib plane and stiffened plane shown.

[0076] 11. The support structure design management object is a functional graphic object with the following basic characteristics: 1. The support structure design management object is a functional graphic object expressed by a rectangular frame, and is also a characteristic symbol object. Its rectangular frame contains the support plane layout object group, the support facade layout object group and the support facade layout detail object, which is used to realize the comprehensive management of the support structure design.

[0077] 2. The attribute information of the support structure design management object includes the attribute information of each component object in the support facade arrangement object group, such as the support pile elevation object, foundation pit soil layer elevation object, internal support elevation object, cap elevation object, water level mark object, full uniform load object, rectangular uniform load object, strip uniform load object and bottom concrete elevation object. These attribute information can be modified through the preset interface. The attribute information of the support structure design management object also includes the safety level used for the calculation of the foundation pit support structure, the relevant strip calculation width, the horizontal displacement of the pit bottom, etc., which are used to represent the basic information for realizing the calculation of the cap foundation pit support structure.

[0078] 3. According to the relevant foundation pit technical standards or technical specifications, the soil pressure in the active and passive areas of the support structure, embedded stability, anti-uplift stability, overall stability, underground seepage stability, support piles, internal support structure, soil reaction force and bottom concrete can be calculated on the preset interface, and a calculation book that meets the requirements of the specifications can be automatically generated.

[0079] 12. The back cover concrete object is a two-dimensional functional graphic object with the following basic characteristics: 1. The bottom concrete object is a characteristic symbol object expressed in a rectangular form, which is used to represent the bottom concrete of the foundation pit and has attribute information such as the thickness and grade of the bottom concrete.

[0080] 2. The thickness and grade of the bottom cover concrete can be modified on the preset interface to obtain the required bottom cover concrete object.

[0081] 13. The joint object is a two-dimensional functional graphic object with the following basic characteristics: 1. The joint object has attribute information such as the joint name, and is arranged at the end of the brace or diagonal brace in the inner support plane object. The brace or diagonal brace is welded to the ring beam through the joint object to form a whole.

[0082] 2. Draw the two-dimensional joint geometry first, merge it into a block object, and then convert it into a joint object. You can also build a parametric joint object and get the required joint object by setting parameters in the preset interface.

[0083] 3. First build different types of joint objects and store them in the system database. Then, on the preset interface, specify the joint name and modify it to obtain the required joint object.

[0084] 4. If Fig.15 As shown, the connector object has various displays, such as Fig.15 (a) and Fig.15 (b) shows two types of braced joints. Fig.15 (c) The diagonal brace joint shown, Fig.15 (d) A bracing joint composed of a plurality of joints, and Fig.15 (e) shows a diagonal brace joint composed of multiple joints.

[0085] 14. The internal support corbel object is a two-dimensional functional graphic object with the following basic features: 1. The internal support corbel object has attribute information such as the internal support corbel name.

[0086] 2. Draw the 2D internal support corbel geometry first, merge it into a block object, and then convert it into Fig.16 The inner support corbel object shown. A parametric inner support corbel object can also be constructed, and the required inner support corbel object can be obtained by setting parameters in the preset interface.

[0087] 3. First construct different types of internal support corbel objects and store them in the system database. On the preset interface, specify the internal support corbel name and modify it to obtain the required internal support corbel object.

[0088] 15. The rod object is a two-dimensional functional graphic object with the following basic characteristics: 1. The rod object is a functional graphic object used to represent steel components such as I-beams, channels, H-shaped steels, steel pipes, etc. It has attribute information such as rod number, rod name, rod type, rod specification, rod material, rod length, rod quantity, display status, etc. These attribute information can be modified through the preset interface to obtain the required rod object.

[0089] 2. Different types of rods need to be described using corresponding steel specifications, such as I40a, 2[36a, I20a, etc. When the rod is a steel pipe, its specifications are the diameter and wall thickness of the steel pipe.

[0090] 3. The display status of the bar object includes Fig.17 (a) The elevation of the bar shown, Fig.17 (b) The plane of the rod and Fig.17 (c) shows the three states of the bar cross section.

[0091] 4. Each member needs to define its corresponding member name. For example, in the inner support plane object, the member name of the ring beam is ring beam, the member name of the diagonal brace is diagonal brace, and the member name of the opposite brace is opposite brace.

[0092] 5. The rod object can be created by forced conversion, that is, first draw a straight line segment representing the centroid axis of the rod, then force it to be converted into a rod object, and then modify the corresponding attribute information through its preset interface to obtain the required rod object.

[0093] 6. The specification of a rod is information that describes its cross-sectional shape and geometric dimensions. For example, by giving the attribute information "I40a spacing is 40mm", it can be indicated that the specification of the rod is a double I40a I-beam with a cross-sectional static spacing of 40mm.

[0094] 16. Cap foundation pit elevation detail object is a two-dimensional functional graphic object with the following basic features: 1. The cap foundation pit elevation detail object is a view obtained by cutting the cap foundation pit in the longitudinal or transverse direction, which is used to indicate the state of the cap foundation pit support elevation arrangement. The cap foundation pit elevation detail object records the description of the foundation pit soil layer parameters, the elevation marks of the pile top, water level, the boundary line elevation of each soil layer, the cap bottom elevation, the bottom of the concrete soil cushion layer, the internal support elevation, the internal support corbel, the ring beam section, the soil backfill area, the concrete backfill area and other information.

[0095] 2. The foundation pit elevation detail object has attribute information such as soil backfill height, concrete backfill layer height, whether each construction condition is displayed, longitudinal or transverse section direction, etc. The installation of each internal support structure, excavation to the bottom of the foundation pit and pouring of the bottom concrete, soil backfill or concrete backfill, and removal of each internal support structure are collectively referred to as a condition. These attribute information can be modified on the preset interface, and the display status of the foundation pit elevation detail for different conditions can be established according to the support elevation layout object group.

[0096] The rapid design method of the foundation pit support structure of the present invention comprises the following steps: S1. Based on the design data of the bridge structure, use the 2D or 3D geometric modeling function of the BIM system to establish Figure 1 A cap pile object in a bridge structure shown.

[0097] S2. Given the static distance from the edge of the cap plane and the inner edge of the support pile plane to the edge of the cap, first create a support facade layout object group through the cap pile foundation object. Figure 2 As shown, the support facade arrangement object group includes support pile facade object G, foundation pit soil layer facade object H, internal support facade object S, pedestal facade object C, water level mark object W, full uniformly distributed load object Q1, rectangular uniformly distributed load object Q2, strip uniformly distributed load object Q3 and bottom concrete facade object D. Figure 2 The internal support facade object S in the figure includes three internal support structures, which are the first internal support structure, the second internal support structure and the third internal support structure from top to bottom.

[0098] Then, create a support plane layout object group through the pile foundation object. Figure 3 As shown, the support plane arrangement object group includes an inner support plane object WL, a cap pile foundation plane object T1 and a series of support pile plane objects Gp.

[0099] Finally, a support facade layout detail object and a support structure design management object are created through the cap pile foundation object.

[0100] like Figure 4 As shown, in the support elevation layout detail object, there are records and displays of foundation pit soil layer parameter marks, as well as elevation marks such as pile top, water level, elevation of each soil layer boundary line, elevation of pedestal bottom, bottom of concrete soil cushion layer, etc. There are also graphic marks of internal support contour, soil backfill, concrete backfill layer, etc.

[0101] like Figure 5 As shown, the supporting structure design management object records each component object in the supporting facade arrangement object group and its attribute information, and the corresponding supporting structure calculation can be performed.

[0102] The four parts of the support facade layout object group, support plane layout object group, support facade layout detail object and support structure design management object established in this step together constitute the initial foundation pit support structure design plan.

[0103] S3. According to the hydrogeological conditions of the construction site, by modifying the attribute information of the support structure design management object, or by editing the relevant objects in the support facade layout object group, a support facade layout object group that meets the hydrogeological requirements of the site can be obtained. According to the number of internal support facades in the support facade layout object group, an equal number of support plane layout object groups can be obtained by copying or deleting the editing method.

[0104] S4. For each support plane arrangement object group, a support plane arrangement object group that meets the static spacing requirement is obtained by setting a static spacing from the inner edge of the support pile plane to the edge of the foundation plane.

[0105] S5. Set the cross-sectional specifications and layout attribute information of the braces and diagonal braces on the inner support plane objects in each support plane layout object group to obtain the required inner support plane objects.

[0106] When the required internal support plane object cannot be obtained by setting the attribute information or modifying the attribute information, the internal support plane object can be decomposed into independent bar objects first; then the required bar objects can be established by drawing and editing; finally, the established bar objects can be merged and forcibly converted into the required internal support plane object. The bar objects here include ring beams, braces and diagonal braces.

[0107] S6. According to the support facade arrangement object group obtained in step S3 and the internal support plane object obtained in step S5, in accordance with the requirements of relevant technical specifications, a two-dimensional or three-dimensional structural calculation is performed on the internal support structure expressed by the support piles and the internal support plane object in the support structure to obtain structural calculation results of strength, stiffness and stability, etc. Then, mechanical calculations of the overall stability, embedded stability and anti-uplift of the foundation pit support are performed respectively.

[0108] S7. When the mechanical calculation result of step S6 cannot meet the requirements of the technical specifications, steps S4-S6 are repeated until a mechanical calculation result that meets the requirements of the technical specifications is obtained, and a calculation report is automatically generated.

[0109] S8. According to the support facade layout object group and each support plane layout object group, set the concrete or soil backfill parameters related to the internal support structure demolition working condition, and establish the support facade layout detail objects corresponding to each working condition from the installation of the internal support structure step by step to the entire demolition process.

[0110] S9. In each support plane layout object group, respectively set the corbel support layout information, angle brace layout information, ring beam reinforcement rib layout information and adjustment joint layout information of braces and diagonal braces, and establish the design details of the ring beam, brace and diagonal brace in each internal support structure; and according to the support elevation layout object group and each support plane layout object group, establish the engineering number drawing quantity table of the internal support structure and support piles.

[0111] S10. If there are incomplete local details in the design details of the ring beam, brace and diagonal brace of each internal supporting structure, conventional drawing methods can be used to supplement the local details of the design details of the ring beam, brace and diagonal brace of each internal supporting structure, and the supplemented local details can be calculated to complete the required design details of the foundation pit support structure.

Claims

1. A rapid design method for a foundation pit support structure, characterized in that: The following steps are involved: S1. Based on the design data of the bridge structure, use the BIM system to establish the pile foundation object in the bridge structure; S2. Given the static distance from the edge of the cap plane and the inner edge of the support pile plane to the edge of the cap, establish the support facade layout object group, support plane layout object group, support facade layout detail drawing object and support structure design management object through the cap pile foundation object; S3. By modifying the attribute information of the support structure design management object, or by editing the objects in the support facade arrangement object group, a support facade arrangement object group that meets the on-site hydrogeological requirements is obtained; according to the number of internal support facades, an equal number of support plane arrangement object groups are obtained by copying or deleting; S4. By setting the static spacing from the inner edge of the support pile plane to the edge of the cap plane, a support plane arrangement object group that meets the static spacing requirement is obtained; S5. Setting the cross-sectional specifications and layout attribute information of the bracing and the diagonal bracing on the inner support plane object in each support plane layout object group to obtain the required inner support plane object; S6, according to the support facade arrangement object group obtained in step S3 and the inner support plane object obtained in step S5, the inner support structure in the support structure is structurally calculated, and then the overall stability, embedded stability and mechanical calculation of the anti-uplift of the foundation pit support are respectively performed; S7, repeating steps S4-S6 until a mechanical calculation result that meets the requirements of the technical specifications is obtained and a calculation report is generated; S8. According to the support facade layout object group and each support plane layout object group, set the backfill parameters of concrete or soil, and establish the support facade layout detail drawing object corresponding to each working condition from the installation of the inner support structure step by step to the whole process of demolition; S9. In each support plane layout object group, respectively set the corbel support layout information, angle brace layout information, ring beam reinforcement rib layout information and adjustment joint layout information of braces and diagonal braces, and establish the design details of the ring beam, brace and diagonal brace in each internal support structure; and according to the support elevation layout object group and each support plane layout object group, establish the engineering number drawing quantity table of the internal support structure and support piles.

2. The rapid design method for foundation pit support structure according to claim 1 is characterized in that: The following steps are also included: S10. Supplement local details to the design details of the ring beam, brace and diagonal brace of each internal supporting structure to complete the design details of the foundation pit support structure.

3. The rapid design method for foundation pit support structure of a cap according to claim 1 or 2 is characterized in that: The support facade arrangement object group includes support pile facade objects, foundation pit soil layer facade objects, internal support facade objects, pedestal facade objects, water level mark objects, full uniform load objects, rectangular uniform load objects, strip uniform load objects and bottom concrete facade objects.

4. The rapid design method for foundation pit support structure of a cap according to claim 1 or 2 is characterized in that: The support plane layout object group includes an inner support plane object, a cap pile foundation plane object and a series of support pile plane objects.

5. The rapid design method for foundation pit support structure of a cap according to claim 1 or 2 is characterized in that: In step S5, when the required inner support plane object cannot be obtained, the inner support plane object is first decomposed into independent rod objects, and then the required rod objects are established by drawing and editing, and the established rod objects are merged and forcibly converted into the required inner support plane object.

6. The rapid design method for foundation pit support structure of claim 5 is characterized in that: The rod objects include ring beams, braces and diagonal braces.

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