Front support type grouting steel pipe positioning and arranging construction method in building support construction system based on BIM (Building Information Modeling) technology

Abstract

The invention discloses a front support type grouting steel pipe positioning and arranging construction method in a building support construction system based on a BIM technology. A foundation building component model and a front support steel pipe model are assembled; after mold closing is completed, the conflict positions of the front supporting steel pipes and the foundation building components and the conflict position condition between the front supporting steel pipes can be found, and according to a collision check result, positioning arrangement of the conflict positions of the front supporting steel pipes is optimized and adjusted to form an optimized BIM three-dimensional model; and the front supporting steel pipes are horizontally moved or the tail parts of the front supporting steel pipes are rotationally adjusted at a small angle to avoid the positions of structural beams, frame columns, pile foundations, bearing platforms or other front supporting steel pipes, so that the interference phenomenon of the front supporting steel pipes is avoided. By means of the construction method, the problem of collision in arrangement of the front supporting steel pipes is solved, the cost of construction measures is reduced, the construction quality and the structural stability are improved, and convenience is provided for follow-up construction operation.

Description

Technical Field

[0001] The present invention relates to a construction support construction system, in particular to a construction method for positioning and arranging front strut grouting steel pipes in a building support construction system based on BIM technology. Background Art

[0002] During the construction of the Wuhu South Station Science and Technology Park project, the construction of a deep foundation pit project is involved. At the node intersection, there will be a certain intersection between the arrangement of the front strut grouting steel pipes and the pile caps and pile foundations. There are problems with the construction progress being blocked in this complex node area. For the construction safety, structural stability, and convenience of subsequent construction operations, it is necessary to stagger the basic building components such as pile caps, pile foundations, structural beams, and frame columns. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a construction method for positioning and arranging front strut grouting steel pipes in a building support construction system based on BIM technology in view of the above-mentioned deficiencies of the prior art. This construction method for positioning and arranging front strut grouting steel pipes in a building support construction system based on BIM technology solves the problem of collision in the arrangement of front strut steel pipes, reduces a large amount of measure costs, improves the construction quality, and also improves the structural stability and the convenience of subsequent construction operations.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a construction method for positioning and arranging front strut grouting steel pipes in a building support construction system based on BIM technology, including the following steps: S1: Based on the existing design drawings, carefully read the drawings, conduct secondary detailed design of the basic building components, and at the same time use Revit software to establish a BIM three-dimensional model to realize the visualization of pile foundations, pile caps, raft plates, structural beams, frame columns, and double-row piles; after the design unit conducts detailed design of the front strut steel pipe drawings, use tekla steel structure software to establish a BIM three-dimensional model of the front strut steel pipe; S2: Use the axis for precise positioning, and combine the basic building component model with the front strut steel pipe model; after the combination of models is completed, it can be found the conflict positions between the front strut steel pipes and the basic building components, as well as the conflict positions between the front strut steel pipes; S3: According to the collision inspection results, optimize and adjust the positioning and arrangement of the conflict positions of the front strut steel pipes to form an optimized BIM three-dimensional model; horizontally move the front strut steel pipes or rotate the tails at a small angle to avoid the positions of structural beams, frame columns, pile foundations, pile caps, or other front strut steel pipes, and ensure that there is no interference between the front strut steel pipes; Among them, S3 further includes the following steps: S31. The front strut steel pipe conflicts with the structural beam and frame column. With the upper support point remaining stationary, it is adjusted by a small-angle rotation at the tail position to avoid the structural beam and frame column, allowing the front strut steel pipe to pass through the raft base surface; S32. The front strut steel pipe conflicts with the pile cap. The front strut steel pipe moves horizontally along the double-row piles to adjust its position and avoid the pile cap, positioning it on the raft to prevent conflict with the pile cap; S33. The front strut steel pipe conflicts with the adjacent front strut steel pipe. By moving the lower support point of the front strut steel pipe on one side of the horizontal short side, the horizontal and vertical angles are adjusted to prevent the front strut steel pipes from intersecting each other; S4: For the deepened BIM 3D model of the foundation building components and the BIM 3D model of the front strut steel pipe; use Revit software to issue the deepened design drawings and generate a detailed construction plan for the positioning and arrangement of the front strut steel pipe; the construction plan accurately simulates the quantity, size, installation sequence, and positioning and arrangement position of the front strut steel pipe; after the drawings are deepened, they are submitted to the structural design institute for review. After the review is correct, the written procedures are completed; at the same time, the deepened BIM 3D model is submitted to the steel structure manufacturer, and the manufacturer can directly realize the production scheduling of the components based on the BIM 3D model, and complete the hole setting during the production process to avoid inaccurate positioning caused by secondary hole opening or damage to the steel section members; S5: Based on the deepened BIM 3D model, a 3D lightweight model is exported. The 3D lightweight model can be directly displayed on the mobile terminal, facilitating on-site operators to check at any time; at the same time, use Revit software to produce 3D animations to demonstrate the specific process of the combined formwork construction of the foundation building components and the front strut steel pipe, and conduct 3D visualization technical disclosure to the operators, enabling the operators to more intuitively understand the specific construction method of the front strut steel pipe, ensuring construction efficiency and construction quality; S6: After all components are transported from the processing plant to the construction site and hoisted, after the operators complete the fixing of the front strut steel pipe and pass the self-inspection, they report to the project department for acceptance; the full-time quality inspectors of the project department can use the 3D lightweight model for intuitive comparison to conduct the acceptance of the front strut steel pipe nodes and improve the acceptance efficiency.

[0005] Furthermore, step S6 also includes: S61: Excavate the trench and measure and set out the lines; S62: Position the drill rig; S63: Drill holes and pilot holes; S64: Move the drill rig; S65: Hoist and position the excavator and manipulator; S66: Position the pile driver and drive the front strut steel pipe; S67: Weld the top of the steel pipe for continuous construction; S68: Fill with gravel; S69: Grout the front support steel pipe to form a grouted front support steel pipe.

[0006] Furthermore, in step S62, the drilling rig should be stable. Before insertion, lay out the position according to the three-dimensional lightweight model and make marks for positioning; the positioning error should be less than 50 mm, the hole inclination error should be less than 5°, and the construction should be carried out strictly according to the designed pile length.

[0007] Furthermore, in step S63, the hole forming of the front support steel pipe adopts the vibration insertion method. Determine whether to pre-drill according to the soil layer conditions of the site; or directly use the manipulator to vibrate it into the designed pile length: the single-section length is controlled at 6 - 12 m in combination with the site conditions.

[0008] Furthermore, for the pre-drilling construction: Use a pre-drilling rig to pre-drill to the designed required depth, and then use a manipulator to hydrostatically press the front support at the pre-drilled hole position to make the front support reach the designed bearing stratum, and the bearing stratum meets the design requirements and enters the moderately weathered rock by no less than 50 cm.

[0009] Furthermore, for the trial hole forming: Before the construction of the foundation pit support structure, conduct a trial hole forming for the front support steel pipe. Select the construction machinery and technology according to the trial hole forming to ensure that the front support steel pipe sinks into the hard soil layer and the moderately weathered limestone bearing stratum.

[0010] Furthermore, in step S65, for the angle correction: Lift and place the front support steel pipe corresponding to the drilled and pre-drilled hole, and perform angle correction on it.

[0011] Furthermore, in steps S66 - S67, after the pile driver is in place and the angle is measured, drive the first section of the steel pipe until the top of the steel pipe is 1 m higher than the trench; during the driving process of the steel pipe, measure and correct the inclination angle, and make sure to be accurate, uniform, and stable during the lowering process; lift the second section of the steel pipe by the manipulator and butt-joint it with the first section of the steel pipe. After the jointing is completed, complete the welding construction at the top of the steel pipe; drive the second section of the steel pipe to complete the piling process.

[0012] Furthermore, step S69 includes the preparation of cement slurry and the regulation of the slurry injection speed: Build a slurry mixing construction platform at the construction site, build a cement warehouse near the construction platform, and configure the slurry before starting the machine; the cement for the mixing pile is P.O42.5 grade ordinary Portland cement, which is required to be fresh, dry, and free of caking. The water-cement ratio is 0.50 - 0.60, the grouting pressure is 1.5 - 2.5 Mpa, the grouting speed is 40 - 60 L / min, and the grouting volume for each pile is 4 t.

[0013] Further, step S69 includes grouting in sequence: The grouting sequence adopts the construction method of skipping one and separating one. The grouting process uses the grouting method with the end of the pipe mouth sealed. After the steel pipe rod body is sunk in place, gravel is filled and grouting follows. The three - time grouting process is adopted: the first grouting volume is 60% of the designed grouting volume, and the second and third grouting volumes are 20% of the designed grouting volume respectively. The interval time between each grouting is 1.5 - 2.5 hours.

[0014] The present invention has the following beneficial effects: 1) Combine the basic building component model with the front - support steel pipe model; after the combination of the models is completed, it can be found the conflict positions between the front - support steel pipes and the basic building components, as well as the conflict positions between the front - support steel pipes. According to the collision inspection results, optimize and adjust the positioning arrangement of the conflict positions of the front - support steel pipes to form an optimized BIM three - dimensional model; horizontally move the front - support steel pipes or rotate the tails at a small angle to avoid the positions of structural beams, frame columns, pile foundations, pile caps or other front - support steel pipes, ensuring that there is no interference between the front - support steel pipes. Through the construction method of the present invention, not only the problem of collision in the arrangement of the front - support steel pipes is solved, the construction measure cost is reduced, but also the construction quality and structural stability are improved, providing convenience for subsequent construction operations.

[0015] 2) Based on the deepened BIM three - dimensional model, export a three - dimensional lightweight model. The three - dimensional lightweight model can be directly displayed on mobile devices such as mobile phones, which is convenient for on - site operators to check at any time; at the same time, use Revit software to produce three - dimensional animations to demonstrate the specific process of the combined construction of the basic building components and the front - support steel pipes, and conduct three - dimensional visualization technical disclosure to the operators, enabling the operators to more intuitively understand the specific construction method of the front - support steel pipes, ensuring the construction efficiency and construction quality. Moreover, use the three - dimensional lightweight model for on - site monitoring and node acceptance to ensure the accuracy and safety during the construction process and improve the acceptance efficiency.

[0016] 3) Grout the front - support steel pipes to form front - support grouted steel pipes, which can better adapt to complex geological conditions, and the steel pipe grouting construction process can significantly improve the construction efficiency and enhance the reinforcement effect. Description of the Drawings

[0017] Figure 1 is the optimized positioning arrangement BIM model diagram of the front - support grouted steel pipe in a building support construction system based on BIM technology of the present invention.

[0018] Figure 2 is the construction procedure of the basic building components construction and the front - support steel pipe positioning arrangement in a building support construction system based on BIM technology of the present invention.

[0019] Among them: 1. Pile foundation; 2. Pile cap; 3. Structural beam; 4. Front - support steel pipe; 5. Frame column; 6. Raft slab; 7. Front - support steel pipe with collision; 8. Double - row piles. Detailed implementation manners

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred implementation manners.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not indicate the importance of the components, so it cannot be understood as a limitation to the present invention. The specific dimensions adopted in this embodiment are only for illustrating the technical solution by way of example and do not limit the protection scope of the present invention.

[0022] As Figure 1-2 shown, a construction method for positioning and arranging front support grouting steel pipes in a building support construction system based on BIM technology includes the following steps: S1: On the basis of the existing design drawings, carefully read the drawings, conduct secondary detailed design on the basic building components, and at the same time use Revit software to establish a BIM three-dimensional model to realize the visualization of pile foundations, bearing platforms, raft plates, structural beams, frame columns, and double-row piles; after the design unit conducts detailed design on the front support steel pipe drawings, use tekla steel structure software to establish a BIM three-dimensional model of the front support steel pipe.

[0023] Among them, the basic building components include pile foundation 1, bearing platform 2, raft plate 6, structural beam 3, frame column 5, and double-row pile 8. The BIM three-dimensional model conducts visual and accurate simulation on the design of the basic building components.

[0024] The bearing platform is flush with the raft plate to form a basic foundation surface; the pile foundations are evenly buried at the bottom end of the bearing platform; the structural beams and frame columns are arranged on the basic foundation surface according to the design requirements; the double-row piles are arranged on the periphery of the basic foundation surface according to the design requirements.

[0025] S2: Use the axis for precise positioning, and combine the basic building component model with the front support steel pipe model; after the combination is completed, it can be found the conflict positions between the front support steel pipe and the basic building components, as well as the conflict positions between the front support steel pipes.

[0026] Among them, combining the basic building component model with the front support steel pipe model means adding the BIM three-dimensional model of the front support steel pipe into the BIM three-dimensional model of the basic building components; the lower part of the front support steel pipe penetrates through the raft plate base surface to form a lower fulcrum; the upper part supports and leans against the double-row piles to form an upper fulcrum.

[0027] Furthermore, based on the BIM three-dimensional model three-dimensional visualization technology, using the collision detection function, simulate and determine the conflict positions between the front support steel pipes and the basic building components, as well as the conflict positions between the front support steel pipes.

[0028] S3: According to the collision inspection results, as Figure 2 shown, there are front support steel pipes 7 with collisions in the front support steel pipes 4. Optimize and adjust the positioning arrangement of the conflict positions of the front support steel pipes to form an optimized BIM three-dimensional model; horizontally move the front support steel pipes or rotate the tail at a small angle to avoid the positions of structural beams, frame columns, pile foundations, pile caps or other front support steel pipes, ensuring that there is no interference between the front support steel pipes.

[0029] Among them, S3 also includes the following steps: S31: When there is a conflict between the front support steel pipe and the structural beam or frame column, with the upper support point remaining stationary, adjust by rotating the tail at a small angle to avoid the structural beam and frame column, and let the front support steel pipe pass through the raft base surface.

[0030] Specifically, during the construction process, when facing the thorny problem of the conflict between the front support steel pipe and the structural beam or frame column, to ensure the smooth progress of the construction and the overall stability of the structure, it is required that the upper support point position (the connection position with the double-row piles) remains relatively stationary. By rotating the tail of the front support steel pipe at a small angle, gradually change the specific position of the tail in space, so that the path of the front support steel pipe avoids the obstacles of the structural beam and frame column, and finally enables the front support steel pipe to pass through the raft base surface smoothly.

[0031] S32: When there is a conflict between the front support steel pipe and the pile cap, move the front support steel pipe horizontally along the double-row piles, adjust the position to avoid the pile cap and locate it on the raft, avoiding the conflict between the front support steel pipe and the pile cap position.

[0032] Specifically, at the construction site, there is a situation where the front support steel pipe conflicts with the pile cap. The front support steel pipe moves horizontally along the double-row piles, and the position of the front support steel pipe is carefully adjusted by precisely horizontally moving the front support steel pipe. During the adjustment process, pay attention to the position of the pile cap to ensure that the front support steel pipe can accurately avoid the pile cap area and finally pass through the raft base surface smoothly. This operation not only effectively avoids the situation of the front support steel pipe overlapping with the pile cap position, but also ensures the force uniformity and stability of the entire structure.

[0033] S33: When there is a conflict between the front support steel pipe and the adjacent front support steel pipe, move the lower support point position of the front support steel pipe on the horizontal short side, adjust the horizontal angle and vertical angle to avoid the front support steel pipes from intersecting each other.

[0034] During the construction process, there may also be a special situation where there is a position conflict between the front support steel pipes and adjacent front support steel pipes. First, determine the adjustment target as the position of the lower fulcrum of the front support steel pipe: precisely move it on one side of the horizontal short side to gradually change the position of the lower fulcrum; at the same time, adjust the horizontal and vertical angles of the front support steel pipe according to the actual situation on site to avoid the problem of the front support steel pipes intersecting with each other, ensuring the reasonable layout and smooth operation of the entire front support steel pipe system.

[0035] S4: For the BIM three-dimensional model of the deepened basic building components and the BIM three-dimensional model of the front support steel pipes; use Revit software to issue the deepened design drawings and generate a detailed construction plan for the positioning and arrangement of the front support steel pipes; the construction plan accurately simulates the quantity, size, installation sequence, and positioning and arrangement positions of the front support steel pipes; after the drawings are deepened, submit them to the structural design institute for review. After the review is correct, complete the written procedures; at the same time, hand over the deepened BIM three-dimensional model to the steel structure manufacturer, and the manufacturer can directly realize the production scheduling of the components based on the BIM three-dimensional model, and complete the hole setting during the production process to avoid inaccurate positioning caused by secondary hole opening or damage to the steel section members.

[0036] Among them, according to the optimized BIM three-dimensional model, generate a detailed construction plan for the positioning and arrangement of the front support steel pipes; the deepened design drawings can detail the quantity, size, installation sequence, and positioning and arrangement positions of the front support steel pipes; the front support steel pipe size includes two parameters: length and diameter.

[0037] S5: Based on the deepened BIM three-dimensional model, export a three-dimensional lightweight model, which can be directly displayed on mobile devices such as mobile phones, facilitating on-site operators to check at any time; at the same time, use Revit software to produce three-dimensional animations to demonstrate the specific process of the combined formwork construction of the basic building components and the front support steel pipes, and conduct three-dimensional visualization technical disclosure to the operators, enabling the operators to more intuitively understand the specific construction method of the front support steel pipes, ensuring construction efficiency and construction quality.

[0038] S6: After each part of the components are transported from the processing plant to the construction site and hoisted, after the front support steel pipes arrive at the site and the operators pass the self-inspection, report to the project department for acceptance; the full-time quality inspectors of the project department can use the three-dimensional lightweight model for intuitive comparison to conduct the acceptance of the front support steel pipe nodes, greatly improving the acceptance efficiency.

[0039] Specifically, use the three-dimensional lightweight model for on-site monitoring and node acceptance to ensure accuracy and safety during the construction process and improve the acceptance efficiency.

[0040] In one of the embodiments, further, before the operators fix the front support steel pipes, it also includes the construction of the basic building components and the construction of the positioning and arrangement of the front support steel pipes, which can specifically refer to steps S61~S69.

[0041] Before construction, first level the site, weld the casing pipe, weld the pile tip, and tie the bladder bag.

[0042] S61: Excavate the trench and measure and set out the lines.

[0043] In this step, the construction working face must meet the requirements of flatness and strength to ensure the stability and safety of equipment construction. Preferably, lay steel plates on the construction working face.

[0044] Furthermore, the construction working face must meet the requirements for the walking of the plugging and unplugging machine, and must meet the requirements for the plugging and unplugging machine to lift the steel pipe in terms of space.

[0045] S62: Position the drilling rig.

[0046] In this step, uniformly command the drilling rig to be positioned. Before positioning the drilling rig, check the surrounding conditions, promptly remove obstacles. After the drilling rig is positioned, check and confirm the positioning of the front support steel pipe, and promptly correct it.

[0047] Furthermore, the drilling rig should be stable. Before insertion, determine the position according to the three-dimensional lightweight model and set marks for positioning; the positioning error is less than 50 mm, the hole inclination error is less than 5°, and construct strictly according to the designed pile length.

[0048] S63: Drill holes and pilot holes.

[0049] In this step, the front support steel pipe is formed into a hole by the vibration method. Determine whether to drill a pilot hole according to the soil layer conditions of the site; or directly use the manipulator to vibrate it into the designed pile length: the single-section length should be controlled at 6 - 12 m in combination with the site conditions.

[0050] In one of the embodiments, furthermore, for the pilot hole construction: use a pilot hole drilling rig to pre-drill to the designed depth, and then use a manipulator to hydrostatically press the front support at the pre-drilled hole position to make the front support reach the designed bearing stratum, and the bearing stratum meets the design requirements and enters the moderately weathered rock by no less than 50 cm. The direction and angle of the pilot hole are controlled by the mechanical equipment operator and the commander to ensure that the design requirements are met.

[0051] In one of the embodiments, furthermore, for the trial hole formation: conduct a trial hole formation for the front support steel pipe before the construction of the foundation pit support structure, select the construction mechanical equipment and technology according to the trial hole formation, and ensure that the front support steel pipe sinks into the hard soil layer and the moderately weathered limestone bearing stratum.

[0052] S64: Move the drilling rig.

[0053] Furthermore, move the drilling rig to the positioning position of another front support steel pipe.

[0054] S65: Hoist and position the excavator and the manipulator.

[0055] This step includes: processing the steel pipe diagonal braces for temporary support and positioning the steel pipe diagonal braces.

[0056] This step also includes: transportation of the front support steel pipes: the excavator transports the front support steel pipes. During the transportation process of the front support steel pipes, pay attention to safety and protect the air bags well.

[0057] This step also includes: angle correction: hoist and position the front support steel pipe corresponding to the drilled hole and pilot hole, and perform angle correction on it. Specifically, the hoisting is realized by a manipulator. The manipulator picks up the end of the front support steel pipe and vertically places it into the trench. When necessary, the excavator can be used to cooperate to hold the other end and assist the manipulator to adjust the steel pipe to the hole position and correct its angle.

[0058] S66: Position the pile driver and drive the front support steel pipe.

[0059] Furthermore, after the pile driver is positioned and the angle is measured, drive the first section of the steel pipe until the top of the steel pipe is about 1 m higher than the trench.

[0060] Furthermore, during the process of driving the steel pipe, measure and correct the inclination angle. During the lowering process, it is necessary to ensure accuracy, uniform speed, and smoothness.

[0061] S67: Weld the top of the steel pipe for construction.

[0062] Specifically, the manipulator picks up the second section of the steel pipe and docks and joints it with the first section of the steel pipe. After the jointing of the piles is completed, complete the welding construction at the top of the steel pipe; drive the second section of the steel pipe to complete the piling process.

[0063] Specifically, it also includes: moving the pile driver to the next pile and repeating steps S66 - S67 until the driving of the last pile is completed.

[0064] Furthermore, the measures for dealing with karst when the front support steel pipe encounters karst are also included in steps S66 - S67: when the front support steel pipe encounters karst, it should be lengthened specifically so that the front support enters the filling in the karst cave, and then continue to press the pile until the steel pipe continues to be pressed for more than 5 minutes and the settlement deformation is less than 20 cm, then stop pressing the pile and feedback for design review to ensure its bearing capacity and the safety of the support structure.

[0065] S68: Fill with gravel.

[0066] S69: Grout the front support steel pipe to form a front support type grouted steel pipe.

[0067] Specifically, grouting the front support steel pipe to form a front support type grouted steel pipe can better adapt to complex geological conditions, and the construction technology of grouting the steel pipe can significantly improve the construction efficiency and enhance the reinforcement effect. 1) Preparation of cement slurry and regulation of the slurry injection speed for injection.

[0068] Specifically, a slurry mixing construction platform is built at the construction site, a cement warehouse is built near the construction platform, and the slurry is configured before starting the machine; the cement for the mixing piles is P.O42.5 ordinary Portland cement, which is required to be fresh, dry, and free of caking. The water-cement ratio is 0.50 - 0.60 (which can be adjusted appropriately according to the site conditions), the grouting pressure is 1.5 - 2.5 Mpa, the grouting speed is 40 - 60 L / min, and the grouting volume for each pile is 4t.

[0069] 2) Grout in sequence.

[0070] Specifically, the grouting sequence adopts the construction method of skipping one and spacing one. The grouting process should adopt the end-sealed grouting at the pipe orifice. After the steel pipe rod body is sunk in place, gravel is filled and followed by grouting. The three-time grouting process is adopted: the first grouting volume is 60% of the designed grouting volume, and the second and third grouting volumes are 20% of the designed grouting volume respectively. The interval time between each grouting is 1.5 - 2.5 hours.

[0071] Furthermore, a grouting section is set at the end of the front strut steel pipe. The bottom end of the front strut steel pipe is sealed, and slurry outlet holes are arranged in a plum blossom shape at intervals of 30 cm at the end. The hole diameter is 8 - 10 mm, and angle iron barbs are arranged outside the slurry outlet holes for protection.

[0072] 3) Detection and test requirements.

[0073] Among them, it includes the static load test.

[0074] The static load test of the steel pipe grouting pile should be carried out to determine the bearing capacity of a single pile. The requirements for the static load test are as follows: a. The number of each group of basic tests shall not be less than 1% of the engineering grouting steel pipes, and shall not be less than 3 roots.

[0075] b. The static load test can be carried out only after 14 days of the casting of the ring beam when the strength of the ring beam reaches 80% of the design value and 21 days after the completion of the grouting steel pipes.

[0076] c. Loading direction and loading volume: Load along the axial direction of the front strut grouting steel pipe. The designed maximum loading volume is 1050 kN (for 28m long steel pipe) / 1100 kN (for 33m long steel pipe).

[0077] d. The loading should be carried out in multiple levels and should adopt equal incremental loading step by step. The graded load should preferably be 1 / 10 of the maximum loading volume. The first loading volume can be taken as 2 times of the graded loading; when the top settlement rate reaches the relatively stable standard, the next level of load can be applied; unload equally step by step, and the unloading should be carried out in grades. Each level of unloading volume is taken as 2 times of the graded load during loading.

[0078] e. The deformation is controlled by the total settlement of 30 mm - 50 mm.

[0079] Among them, it also includes the layout of monitoring points.

[0080] The monitoring points for the axial force of the front strut grouting steel pipes shall be arranged at 10% of the total number of steel pipes, and not less than 3. The positions of each monitoring point in the vertical direction should be kept consistent, and they shall be arranged by grooving before excavation in the vicinity of the range 1 meter below the ring beam; the axial force of the front strut grouting steel pipes is monitored by using strain gauges or strain sheets to monitor the strain; the sensors buried at each section shall be 4 and symmetrically distributed.

[0081] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0082] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A construction method for positioning and arranging front - support grouting steel pipes in a building support construction system based on BIM technology, characterized in that: S1: Based on the design drawings, conduct secondary detailed design of the basic building components; use Revit software to establish a BIM three - dimensional model to realize the visualization of pile foundations, caissons, raft slabs, structural beams, frame columns, and double - row piles; use tekla steel structure software to establish a BIM three - dimensional model of the front - support steel pipes. S2: Combine the models to determine the conflict positions between the front - support steel pipes and the basic building components as well as between the front - support steel pipes. S3: According to the collision inspection results, optimize and adjust the positioning and arrangement of the conflict positions to form an optimized BIM three - dimensional model. S31: When the front - support steel pipes conflict with structural beams and frame columns, with the upper support points remaining stationary, adjust by small - angle rotation at the tail position to avoid the structural beams and frame columns and pass through from the raft base surface. S32: When the front - support steel pipes conflict with caissons, the front - support steel pipes move horizontally along the double - row piles to adjust the position and avoid the caissons and be positioned on the raft. S33: When there are conflicts between the front - support steel pipes, move the lower support point positions of the front - support steel pipes on one side of the horizontal short side to adjust the horizontal and vertical angles to avoid the front - support steel pipes from intersecting each other. S4: Generate a detailed construction plan for the positioning and arrangement of the front - support steel pipes, complete the fixation of the front - support steel pipes, and grout the front - support steel pipes to form front - support grouting steel pipes.

2. The construction method for positioning and arranging the front support grouting steel pipes in the building support construction system based on BIM technology according to claim 1, characterized in that: For the front - support steel pipes to be grouted to form front - support grouting steel pipes, the following steps are also included: S41: Excavate trenches and measure and set out lines. S42: Position the drilling rig. S43: Drill holes and pilot holes. S44: Move the drilling rig. S45: Hoist and position the excavator and manipulator. S46: Position the pile driver and drive the front - support steel pipes. S47: Weld the top of the steel pipes for construction connection. S48: Fill with stones.

3. The construction method for positioning and arranging front strut grouting steel pipes in the building support construction system based on BIM technology according to claim 2, wherein: In step S42, the drilling rig should be stable. Before insertion, determine the position according to the three - dimensional lightweight model for setting out lines and make marks for positioning; the positioning error is less than 50 mm, the hole inclination error is less than 5°, and the construction is carried out strictly according to the designed pile length.

4. The construction method for positioning and arranging the front strut grouting steel pipes in the building support construction system based on BIM technology according to claim 2, characterized in that: In step S43, the hole formation of the front - support steel pipes adopts the vibration - insertion method. Determine whether to pilot - hole according to the site soil layer conditions; or directly use the manipulator to vibrate - insert to the designed pile length: the single - section length is controlled at 6 - 12 m in combination with the site conditions.

5. The construction method for positioning and arranging the front support grouting steel pipes in the building support construction system based on BIM technology according to claim 4, characterized in that: Pre - pilot - hole construction: Use a pilot - hole drilling rig to pre - drill to the designed depth, and then use the manipulator to static - press the front - support at the pre - drilled hole position to make the front - support reach the designed bearing layer, and the bearing layer meets the design requirements and enters the moderately weathered rock by no less than 50 cm.

6. The construction method for positioning and arranging front-support grouting steel pipes in the building support construction system based on BIM technology according to claim 5, characterized in that: Trial hole formation: Before the construction of the foundation pit support structure, conduct trial hole formation for the front - support steel pipes, select the construction machinery and technology according to the trial hole formation to ensure that the front - support steel pipes sink into the hard soil layer and the moderately weathered limestone bearing layer.

7. The construction method for positioning and arranging the front-support grouting steel pipes in the building support construction system based on BIM technology according to claim 2, wherein: In step S45, angle correction: Hoist and position the front - support steel pipes corresponding to the drilled and pilot - hole areas and conduct angle correction on them.

8. The construction method for positioning and arranging front-support grouting steel pipes in the building support construction system based on BIM technology according to claim 2, characterized in that: In steps S46 - S47, after the pile driver is in place and the angle is measured, the first section of the steel pipe is driven until the top of the steel pipe is 1 m higher than the trench; during the driving of the steel pipe, the inclination angle is measured and corrected, and it must be accurate, uniform, and stable during the lowering process; the second section of the steel pipe is lifted by the manipulator and butt - jointed with the first section of the steel pipe. After the pile - jointing is completed, the welding connection construction at the top of the steel pipe is completed; the second section of the steel pipe is driven to complete the piling process.

9. The construction method for positioning and arranging the front strut grouting steel pipes in the building support construction system based on BIM technology according to claim 1, characterized in that: Based on the optimized BIM 3D model, the Revit software is used to issue the detailed design drawings and generate a detailed construction plan for the positioning and arrangement of the front - support steel pipes; the construction plan accurately simulates the quantity, size, installation sequence, and positioning and arrangement positions of the front - support steel pipes; it is reviewed and handed over to the manufacturer for production scheduling. The manufacturer directly realizes the production scheduling of components based on the BIM 3D model, and the holes are left during the production process to avoid inaccurate positioning caused by secondary hole - opening or damage to the profiled steel components.

10. The construction method for positioning and arranging the front strut grouting steel pipes in the building support construction system based on BIM technology according to claim 1, characterized in that: Based on the optimized BIM 3D model, a 3D lightweight model is exported; at the same time, the Revit software is used to produce a 3D animation to demonstrate the specific process of the combined formwork construction of the basic building components and the front - support steel pipes, and a 3D visualization technical disclosure is given to the operators.

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