Foundation prefabricated part construction quality safety management and control system

Abstract

The invention relates to the technical field of caisson foundation prefabricated part sinking construction control, in particular to a foundation prefabricated part construction quality safety management and control system which comprises a drilling grouting control unit, a foundation grooving control unit, a caisson sinking control unit, a caisson construction safety analysis unit and a database. Wherein the drilling grouting control unit, the foundation grooving control unit, the caisson sinking control unit and the caisson construction safety analysis unit are all in bidirectional signal connection with the database. According to the system, in the lowering construction process of the large caisson prefabricated part, the foundation ground supporting stability and the perpendicularity of the caisson foundation prefabricated part in the lowering process of the caisson foundation prefabricated part are controlled through the drilling grouting control unit, the foundation grooving control unit and the caisson sinking control unit; it is effectively guaranteed that the caisson foundation prefabricated part meets the requirement in the construction process, meanwhile, the stability of the caisson foundation prefabricated part after construction can be guaranteed, and excessive settlement and inclined settlement are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of caisson foundation prefabricated component sinking construction control, and in particular to a foundation prefabricated component construction quality safety control system. Background Art

[0002] Constructing the foundation of a fixed building by sinking a caisson is a common form of engineering construction. During the construction of the foundation of a fixed building, the caisson foundation is also an indispensable basic component in the construction.

[0003] With the continuous development of prefabrication technology, caisson foundation prefabricated parts are also becoming popular. When constructing the lower structure foundation of an underground structure, it is generally necessary to cooperate with the sinking of the caisson to form a reinforced concrete structure trough chamber at the bottom of the caisson foundation prefabricated part. The caisson body of the caisson foundation prefabricated part sinks to a specified depth under its own weight and the upper load, and then the bottom sealing construction is carried out.

[0004] In the prior art, a multifunctional caisson foundation structure burial depth control method similar to that described in the patent document with patent publication number CN110607799B and IPC classification number E02D23 / 00 is usually used to control the burial depth of the caisson foundation prefabricated parts during the construction process to achieve the purpose of monitoring the construction quality. However, this construction control method has the following problems in the construction of large caisson foundation prefabricated parts: First, monitoring the construction effect by simply relying on the control of the burial depth is one-sided. This method ignores the foundation bearing state behind the caisson, the balance of the internal groove and the caisson. Secondly, the existing construction control only supervises the construction process and controls the overall installation position of the caisson foundation prefabricated parts, but does not monitor and control the sinking stability and settlement stability of the caisson foundation prefabricated parts. However, during the caisson construction process, the construction environment is usually located in the underground foundation stratum, and the pressure environment it needs to withstand is different from that of the ground construction. Its safety is an important factor. Therefore, the existing control method for ground component construction is not suitable for the construction control of caisson foundation prefabricated parts.

[0005] To this end, the present invention optimizes and designs the problems existing in the construction process of target caisson foundation prefabricated parts in the underground foundation construction process in the prior art, and hereby proposes a new system for completing safety management and control of the construction quality of target caisson foundation prefabricated parts in the fixed building industry, so as to better solve the problems existing in the prior art. Summary of the invention

[0006] In order to solve one of the above-mentioned technical problems, the technical solution adopted by the present invention is: a foundation prefabricated component construction quality and safety control system, the system includes a drilling and grouting control unit, a foundation trenching control unit, a caisson sinking control unit, a caisson construction safety analysis unit, and a database; wherein the drilling and grouting control unit, the foundation trenching control unit, the caisson sinking control unit, and the caisson construction safety analysis unit all realize two-way signal connection with the database.

[0007] In any of the above schemes, it is preferred that the drilling and grouting control unit is used to control the mixing drill to drill a hole into the ground foundation and obtain drilling-related parameter information in real time, and control the grouting pump to complete grouting according to the drilling-related parameter information and obtain grouting-related parameter information in real time.

[0008] Foundation trenching control unit: used to obtain relevant parameter information during the trenching process below the foundation ground and control the trenching process.

[0009] Caisson sinking control unit: used to obtain relevant parameter information of the caisson foundation prefabricated parts and its dynamic parameter information during the sinking process.

[0010] Caisson construction safety analysis unit: used to integrate all parameter information obtained from the database and analyze and determine the current construction quality and safety of caisson foundation prefabricated parts.

[0011] Database: used to obtain all parameter information of each unit in the system and realize data sharing among the units.

[0012] In any of the above schemes, preferably, the drilling-related parameter information in the drilling and grouting control unit includes the number of foundation holes, elevation depth, and the average load stress corresponding to the mixing drill during the drilling of each foundation hole. ; Grouting related parameter information includes grouting volume , grouting speed, and grouting pressure.

[0013] In any of the above schemes, it is preferred that the control process of the drilling grouting control unit includes: obtaining drilling design parameters, controlling the mixing drill to drill N foundation holes along the ground foundation according to the drilling design parameters and forming a circle of pile foundation area according to the bottom contour of the caisson foundation prefabricated parts, controlling the bottom of each foundation borehole to extend downward to the elevation depth, and completing the wall protection operation on the inner wall of each foundation borehole.

[0014] Real-time acquisition of the mean load stress of the nth foundation hole during the drilling process of the mixing drill , where n=1,2...N.

[0015] By analyzing the formula Get the original stratum bearing capacity deviation coefficient of the pile foundation area ;in, It is the mean value of load stress of the n+1th foundation hole during the drilling process of the mixing drill.

[0016] Determine the grouting strategy based on the deviation coefficient of the original stratum bearing capacity: When the formation is fractured, grouting should be performed into each foundation borehole to improve the uniform bearing capacity of the formation. When grouting is carried out directly into the foundation holes, it is recommended to choose to grout directly into the foundation holes.

[0017] Control the grouting speed and pressure, and obtain the grouting volume value in the current nth foundation borehole in real time , where n=1,2...N.

[0018] By analyzing the formula Get the percentage of grouting leakage in the pile foundation area ;in, is the theoretical total grouting volume.

[0019] When the percentage of grouting leakage If it meets the requirements, the bearing capacity of the stratum in the pile foundation area after the current grouting meets the requirements. Wait for the grouting to dry completely and continue the subsequent foundation trenching operation.

[0020] Otherwise, it is judged that there is excessive leakage in the stratum of the pile foundation area after the current grouting, and at least one row of foundation piles must be added on the outer ground foundation of the caisson foundation prefabricated parts to be hoisted in subsequently. The depth of each foundation pile is the elevation depth to prevent soil and sand loss during excavation.

[0021] In any of the above schemes, preferably, the control process of the foundation trenching control unit includes: controlling the excavator to dig a trench downward on the foundation ground in the pile foundation area surrounded by the foundation boreholes after grouting.

[0022] During the trenching process, the excavator is controlled to dig the trench in a spiral from the center to the surrounding area, and gradually dig the trench to the required depth.

[0023] After digging the trench to the required depth, level the vertical trench walls on all sides and maintain the verticality between adjacent trench walls.

[0024] Control the leveling machine to level the groove bottom. After leveling, control the laser scanner to obtain the flatness of the groove bottom and maintain the verticality with the groove walls around it. After meeting the standards, the groove bottom leveling operation is completed.

[0025] After the trench bottom is leveled, a ring beam for guidance is set up on the leveled foundation ground around the trench, and verticality measuring instruments are installed on the four sides of the top of the ring beam, waiting for the caisson foundation prefabricated parts to be hoisted in.

[0026] In any of the above schemes, preferably, the control process of the caisson sinking control unit includes: controlling the crane to lift the caisson foundation prefabricated component into the top of the trench, and manually assisting in straightening during the sinking process.

[0027] Control the crane to lower the caisson foundation prefabricated parts and make them sink to the bottom of the trench under the guidance of the ring beam.

[0028] The inclination angles of the four sides of the caisson foundation prefabricated parts are obtained by the verticality measuring instrument and recorded as .

[0029] according to Numerical judgment of the inclination direction of the current caisson foundation prefabricated component.

[0030] Control the long-arm excavator to continue excavating the earth at the bottom of the trench. Each excavation is 2m long, 0.5m deep and 1m wide. When a width of 5m-6m is reserved around the bottom of the trench, switch to a small excavator to continue excavating.

[0031] After each excavation, let it stand for 3-5 minutes, and then obtain the inclination angles of the vertical surfaces around the caisson foundation prefabricated parts again, and record them as .

[0032] Through the following analysis formulas , , , The inclination angle change values ​​of each facade around the caisson foundation prefabricated component are obtained respectively.

[0033] The tilt return rate of the caisson foundation prefabricated component is determined based on the obtained tilt angle change values, and the remaining excavation times are predicted and excavation is continued.

[0034] After excavation to the preset elevation, determine whether the verticality of the current caisson foundation prefabricated parts meets the standards.

[0035] When the verticality meets the standard, the sinking operation of the current caisson foundation prefabricated components is completed.

[0036] In any of the above schemes, it is preferred that after the sinking operation of the current caisson foundation prefabricated component is completed, the crane is controlled to adjust the uniformity of the height difference of the caisson foundation prefabricated component by piling loads on the four corners of the top of the caisson foundation prefabricated component and leaving it stationary.

[0037] In any of the above schemes, preferably, the construction control process of the caisson construction safety analysis unit includes: obtaining the pile load and the change of the pile load at the top four corners of the caisson foundation prefabricated component during the static process.

[0038] When the pile load reaches the set requirement, keep it still and observe the caisson settlement once every 24 hours. m, where m=1,2...M; m is the number of the current observation, and M is the total number of observations.

[0039] By analyzing the formula Obtain the coefficient of variation of caisson settlement rate.

[0040] By observing the coefficient of variation of the settlement rate of each caisson, the settlement stability of the current caisson foundation prefabricated parts under the action of the heap load is determined.

[0041] When the specified loading time is reached, if the coefficient of variation of the caisson settlement rate is less than the standard value, the current caisson foundation prefabricated parts are in a safe and stable state; otherwise, the current caisson foundation prefabricated parts have excessive settlement.

[0042] If the caisson foundation prefabricated components have excessive settlement, at least one row of foundation piles shall be constructed outside the caisson foundation prefabricated components.

[0043] After the construction of the front row of foundation piles is completed, continue to repeatedly observe the coefficient of variation of the settlement rate of each caisson until the coefficient of variation of the settlement rate of the caisson is less than the specification value.

[0044] In any of the above schemes, it is preferred that, after determining that the current caisson foundation prefabricated component is in a safe and stable state, the bottom of the box bottom inside the caisson foundation prefabricated component is controlled to be backfilled with sand and gravel foundation and rolled to level it.

[0045] Tie up the steel frame at the bottom of the box, go through each node of the steel frame and ensure that they are all welded or tied into place.

[0046] Control the pouring equipment to pour concrete into the steel frame and keep vibrating.

[0047] After pouring is completed, control the small leveling machine to go down and complete the leveling.

[0048] During the leveling process, laser scanning is used to obtain all the pits on the concrete surface of the bottom of the box, and the top-view projection area of ​​the i-th pit is recorded as ; Wherein, i represents the number of the pit, i=1,2...I.

[0049] By analyzing the formula Get the pit occupancy rate of the concrete surface at the bottom of the box ;in, is the total area of ​​the concrete surface at the bottom of the box.

[0050] If the pit occupies a certain proportion on the concrete surface of the bottom of the box When the depth is less than the set threshold and the maximum depth of each pit is less than the specified depth, the current concrete surface leveling meets the requirements; otherwise, continue leveling and re-measure until the concrete surface leveling of the bottom of the box meets the requirements and the leveling work is completed. At this time, the bottom sealing construction of the box is completed.

[0051] Compared with the prior art, the present invention has the following beneficial effects: 1. During the lowering construction of large caisson prefabricated parts, this system relies on the drilling and grouting control unit, the foundation trenching control unit, and the caisson sinking control unit to control the foundation ground support stability and the verticality of the caisson foundation prefabricated parts during the lowering process, effectively ensuring that the caisson foundation prefabricated parts meet the requirements during the construction process, and at the same time ensuring the stability of the caisson foundation prefabricated parts after construction to avoid excessive settlement and tilt settlement.

[0052] 2. In the process of controlling the caisson foundation prefabricated parts, this system adopts a multi-factor control method. In the process of current foundation drilling, it relies on real-time monitoring and analysis of the drilling load to obtain the strength analysis of the current stratum. At the same time, it cooperates with the calculation and analysis of the grouting volume and leakage volume in the grouting drilling process to analyze the subsequent bearing and supporting effect of the current stratum. The subsequent construction strategy is determined according to the drilling and grouting analysis, which effectively improves the safety and rationality of the entire construction process.

[0053] 3. The caisson foundation prefabricated parts are initially sunk into place. The spiral excavation method is used in conjunction with the real-time monitoring of the verticality of the four sides of the caisson foundation prefabricated parts. This can effectively determine the standardization of the sinking of the caisson foundation prefabricated parts, effectively adjust the excavation position and speed according to the monitoring results, and effectively ensure the verticality of the caisson foundation prefabricated parts during construction and ensure the sinking effect.

[0054] 4. After the caisson foundation prefabricated parts are sunk into place, the method of stacking load and leaving them to stand is used to effectively ensure the analysis and calculation of the settlement rate of the entire caisson foundation prefabricated parts within the specified observation period, effectively obtain the coefficient of variation of the caisson settlement rate, and after judgment, make the caisson foundation prefabricated parts in a safe and stable state, ensuring their effective bearing on the fixed buildings on the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the specific embodiments of the present invention, the following will briefly introduce the drawings required for the specific embodiments. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, each element or component is not necessarily drawn according to the actual scale.

[0056] Figure 1 It is a schematic diagram of the connection relationship of each unit of the present invention.

[0057] Figure 2 It is a schematic diagram of the top view of the structure of the caisson foundation prefabricated component of the present invention.

[0058] Figure 3 It is a vertical cross-sectional view of the caisson foundation prefabricated component of the present invention.

[0059] In the figure, 1. caisson foundation prefabricated parts; 2. trench bottom; 3. foundation ground; 4. foundation drilling; 5. grouting; 6. pile load; 7. ring beam; 8. foundation piles. DETAILED DESCRIPTION

[0060] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-Figure 3 as shown in .

[0061] A foundation prefabricated component construction quality safety control system, the system includes a drilling and grouting control unit, a foundation trenching control unit, a caisson sinking control unit, a caisson construction safety analysis unit, and a database; wherein the drilling and grouting control unit, the foundation trenching control unit, the caisson sinking control unit, and the caisson construction safety analysis unit all realize bidirectional signal connection with the database.

[0062] This system forms a local shared network with the database by combining the relevant parameters obtained by each unit, which can ensure the efficiency and speed of each unit in acquiring data, and effectively ensure the sharing of data within the entire system during the construction control process.

[0063] In any of the above schemes, it is preferred that the drilling and grouting control unit is used to control the mixing drill to drill a hole into the ground foundation and obtain drilling-related parameter information in real time, and control the grouting pump to complete grouting according to the drilling-related parameter information and obtain grouting-related parameter information in real time.

[0064] It should be noted that the drilling and grouting control unit can control the foundation drilling and the grouting process after drilling, effectively ensuring that the bearing characteristics of the initial ground foundation are obtained through the acquisition and analysis of drilling parameters, and at the same time, feedback on the grouting effect is obtained based on the analysis of parameter changes during the grouting process, effectively ensuring the effective support effect of the current ground foundation.

[0065] Foundation trenching control unit: used to obtain relevant parameter information during the trenching process below the foundation ground and control the trenching process.

[0066] Controlling the depth and speed of trenching during the foundation trenching process can effectively ensure the stability of the ground strata after trenching and ensure the stability when sinking the caisson foundation prefabricated parts.

[0067] Caisson sinking control unit: used to obtain relevant parameter information of the caisson foundation prefabricated parts and its dynamic parameter information during the sinking process.

[0068] Caisson construction safety analysis unit: used to integrate all parameter information obtained from the database and analyze and determine the current construction quality and safety of caisson foundation prefabricated parts.

[0069] Database: used to obtain all parameter information of each unit in the system and realize data sharing among the units.

[0070] In any of the above schemes, preferably, the drilling-related parameter information in the drilling and grouting control unit includes the number of foundation holes, elevation depth, and the average load stress corresponding to the mixing drill during the drilling of each foundation hole. ; Grouting related parameter information includes grouting volume , grouting speed, and grouting pressure.

[0071] It should be noted that the drilling and grouting control unit calculates the number of foundation holes, elevation depth, and load stress average. , grouting volume The multi-factor control of grouting speed and grouting pressure can effectively ensure the improvement of the bearing capacity of the ground foundation during the drilling grouting control process.

[0072] In any of the above schemes, it is preferred that the control process of the drilling grouting control unit includes: obtaining drilling design parameters, controlling the mixing drill to drill N foundation holes along the ground foundation according to the drilling design parameters and forming a circle of pile foundation area according to the bottom contour of the caisson foundation prefabricated parts, controlling the bottom of each foundation borehole to extend downward to the elevation depth, and completing the wall protection operation on the inner wall of each foundation borehole.

[0073] It should be noted that the drilling and grouting control unit can pre-enclose the pile foundation area on the periphery of the caisson foundation prefabricated parts by drilling N foundation boreholes when controlling the drilling, and control the inner wall of the foundation borehole to complete the wall protection operation to reduce grouting leakage during subsequent grouting operations.

[0074] Preferably, the mean value of the load stress of the nth basic borehole during the drilling process of the mixing drill is obtained in real time. , where n=1,2...N; by analyzing the formula Get the original stratum bearing capacity deviation coefficient of the pile foundation area ;in, It is the mean value of load stress of the n+1th foundation hole during the drilling process of the mixing drill.

[0075] It should be noted that the mean value of the load stress in each foundation borehole is obtained by calculating the change of each load stress during the drilling process, and the original formation bearing capacity deviation coefficient is obtained by the change of the sum of the deviations of the mean load stress changes in each group of adjacent foundation boreholes. , through the original formation bearing capacity deviation coefficient It can objectively analyze the bearing capacity of the current stratum. After comparing it with the geological survey results, it can be used for the subsequent grouting operation to mix the slurry, control the grouting pressure and water content, and ensure that the slurry can better play a bearing effect after grouting and effectively enhance the bearing strength of the stratum.

[0076] Preferably, the grouting strategy is determined according to the deviation coefficient of the original stratum bearing capacity: When the formation is fractured, grouting should be performed into each foundation borehole to improve the uniform bearing capacity of the formation. When grouting is carried out directly into the foundation holes, it is recommended to choose to grout directly into the foundation holes.

[0077] It should be noted that: according to the results of the original stratum bearing capacity deviation coefficient, when it is initially judged that the stratum bearing capacity is low, in order to avoid sand and soil loss during subsequent excavation, the primary fracturing and then grouting method is adopted in advance to realize grouting in each foundation borehole of the current stratum to form a grouting reinforcement group, which effectively ensures the stability of the entire stratum area after grouting.

[0078] Preferably, the grouting speed and grouting pressure are controlled, and the grouting volume value in the current nth foundation borehole is obtained in real time. , where n=1,2...N.

[0079] Preferably, by analyzing the formula Get the percentage of grouting leakage in the pile foundation area ;in, is the theoretical total grouting volume.

[0080] Preferably, when the grouting leakage percentage If it meets the requirements, the bearing capacity of the stratum in the pile foundation area after the current grouting meets the requirements. Wait for the grouting to dry completely and continue the subsequent foundation trenching operation.

[0081] Otherwise, it is judged that there is excessive leakage in the stratum of the pile foundation area after the current grouting, and at least one row of foundation piles must be added on the outer ground foundation of the caisson foundation prefabricated parts to be hoisted in subsequently. The depth of each foundation pile is the elevation depth to prevent soil and sand loss during excavation.

[0082] It should be noted that the percentage of grouting leakage in the pile foundation area is controlled and calculated. It can effectively obtain the leakage of slurry during the entire grouting process and effectively judge whether there is excessive leakage. When there is excessive leakage on one side, it relies on adding rows of foundation piles on the outer ground foundation to achieve peripheral sealing and reinforcement, ensure the blocking of the inner leakage path, and further enhance the stratum strength on the current side.

[0083] In any of the above schemes, it is preferred that the control process of the foundation trenching control unit includes: controlling the excavator to dig a trench downward on the foundation ground in the pile foundation area surrounded by the foundation drill holes after grouting, and during the trenching process, controlling the excavator to dig a trench in a spiral manner from the center to the surrounding areas, and gradually digging the trench to the required depth.

[0084] It should be noted that the use of a spiral excavation method from the center to the surroundings can avoid soil collapse caused by direct excavation at the four corners, effectively ensure the protection of the soil layer around the internal blade feet of the caisson foundation prefabricated parts, and improve safety during excavation.

[0085] Preferably, after digging the groove to the required depth, the vertical groove walls on all sides are leveled and the verticality between adjacent groove walls is maintained; the leveling machine is controlled to level the groove bottom, and after leveling, the laser scanner is controlled to obtain the flatness of the groove bottom and maintain the verticality with the groove walls on all sides. The groove bottom leveling operation is completed after meeting the standards.

[0086] Leveling the trench bottom and controlling the verticality of the surrounding trench walls can better ensure the stability of the entire trench and ensure that the caisson foundation prefabricated parts are placed horizontally when sinking them.

[0087] Preferably, after the trench bottom leveling operation is completed, a ring beam for guiding is set up on the leveled foundation ground around the trench, and verticality measuring instruments are installed on the four sides of the top of the ring beam, waiting for the caisson foundation prefabricated parts to be hoisted in.

[0088] It should be noted that fixing the ring beam on the ground can ensure that it plays a circumferential limiting and guiding role when the caisson foundation prefabricated parts are sinking, avoiding excessive inclination of the caisson foundation prefabricated parts, while enabling it to move within a smaller range to avoid sinking and getting stuck.

[0089] In any of the above schemes, it is preferred that the control process of the caisson sinking control unit includes: controlling the crane to hoist the caisson foundation prefabricated parts into the top of the trench, and manually assisting in straightening them during the sinking process; controlling the crane to lower the caisson foundation prefabricated parts and sink them to the bottom of the trench under the guidance of the ring beam.

[0090] Preferably, the inclination angles of the four sides of the caisson foundation prefabricated component are obtained by a verticality measuring instrument and recorded as ;according to Numerical judgment of the inclination direction of the current caisson foundation prefabricated component.

[0091] Real-time monitoring and measurement of the inclination angles of each facade of the caisson foundation prefabricated components can effectively control the current sinking of the caisson foundation prefabricated components, ensure their smooth sinking, avoid tilting at excessive angles, and reduce the difficulty of construction corrections.

[0092] Preferably, the long-arm excavator is controlled to continue excavating the earth at the bottom of the trench, with each excavation length of 2m, depth of 0.5m and width of 1m. When a width of 5m-6m is reserved around the bottom of the trench, a small excavator is lowered to continue excavation.

[0093] It should be noted that when excavating the cutting edge of the caisson foundation prefabricated parts near the bottom of the trench, the use of a small excavator to continue excavating can avoid damage to the box body caused by accidental contact with the box body. At the same time, it can ensure more precise construction and reduce the vibration loss of edge sand and soil caused by excessive excavation.

[0094] Preferably, after each excavation is completed, the excavation is left to stand for 3-5 minutes, and the inclination angles of the vertical surfaces around the caisson foundation prefabricated parts are obtained again and recorded in sequence as ; Through the following analysis formulas , , , The inclination angle change values ​​of each facade around the caisson foundation prefabricated component are obtained respectively.

[0095] The tilt return rate of the caisson foundation prefabricated component is determined based on the obtained tilt angle change values, and the remaining excavation times are predicted and excavation is continued.

[0096] After each excavation is completed, the change in the inclination angle of each facade of the caisson foundation prefabricated component after this excavation is obtained according to the analytical formula. After comprehensive analysis, the inclination return rate of the entire caisson foundation prefabricated component can be seen, so as to predict and judge the number of excavations required when the caisson foundation prefabricated component is completely returned to the correct position, thereby judging the remaining excavation construction volume.

[0097] After excavation to the preset elevation, determine whether the verticality of the current caisson foundation prefabricated components meets the standard; when the verticality meets the standard, complete the sinking operation of the current caisson foundation prefabricated components.

[0098] In any of the above schemes, it is preferred that after the sinking operation of the current caisson foundation prefabricated component is completed, the crane is controlled to adjust the uniformity of the height difference of the caisson foundation prefabricated component by piling loads on the four corners of the top of the caisson foundation prefabricated component and leaving it stationary.

[0099] Stacking the load and leaving it to stand can effectively ensure balanced loading at four points of the caisson foundation prefabricated parts, ensure that the caisson foundation prefabricated parts are pressed downward as a whole and complete the control of the entire balanced ballasting process.

[0100] In any of the above schemes, preferably, the construction control process of the caisson construction safety analysis unit includes: obtaining the pile load and the change of the pile load at the top four corners of the caisson foundation prefabricated component during the static process.

[0101] Preferably, when the heap load reaches the set requirement, keep it still and observe the caisson settlement once every 24 hours. m , where m=1,2...M; m is the number of the current observation, and M is the total number of observations; by analyzing the formula The coefficient of variation of caisson settlement rate is obtained; where, represents the caisson settlement at the m+1th observation, represents the caisson settlement at the mth observation, represents the settlement of the caisson at the m-1th observation.

[0102] It should be noted that: by calculating and analyzing the difference between the change rates of two adjacent caisson settlements, the caisson settlement rate variation coefficient can be analyzed and determined, and by observing the caisson settlement rate variation coefficient multiple times, the change in the sinking rate of the current caisson foundation prefabricated parts under the loaded static state can be seen. Therefore, when compared with the design specifications, it is possible to effectively judge and analyze whether the current caisson foundation prefabricated parts are in an excessive settlement state and to judge the settlement stability of the current caisson foundation prefabricated parts.

[0103] Preferably, the settlement stability of the current caisson foundation prefabricated component under the action of the heap load is determined by observing the coefficient of variation of the settlement rate of each caisson.

[0104] When the specified loading time is reached, if the coefficient of variation of the caisson settlement rate is less than the standard value, the current caisson foundation prefabricated parts are in a safe and stable state; otherwise, the current caisson foundation prefabricated parts have excessive settlement.

[0105] If the caisson foundation prefabricated components have excessive settlement, at least one row of foundation piles shall be constructed outside the caisson foundation prefabricated components.

[0106] It should be noted that continuing to construct rows of foundation piles can continue to expand and enhance the bearing capacity of the surrounding strata, effectively reduce the continued settlement of the caisson foundation prefabricated parts, improve the stability of the caisson foundation prefabricated parts, disperse the sinking load to the surroundings, and better ensure the safety and stability of the caisson foundation prefabricated parts after construction.

[0107] After the construction of the front row of foundation piles is completed, continue to repeatedly observe the coefficient of variation of the settlement rate of each caisson until the coefficient of variation of the settlement rate of the caisson is less than the specification value.

[0108] In any of the above schemes, it is preferred that, after determining that the current caisson foundation prefabricated component is in a safe and stable state, the bottom of the box bottom inside the caisson foundation prefabricated component is controlled to be backfilled with a sand and gravel foundation and rolled to level it.

[0109] Tie up the steel frame at the bottom of the box, traverse each node of the steel frame and ensure that they are all welded or tied in place; control the pouring equipment to pour concrete into the steel frame and keep vibrating; after pouring is completed, control the small leveling machine to go down and complete the leveling.

[0110] The method of pouring concrete and maintaining vibration can ensure that the concrete slurry quickly enters the internal space where the concrete is poured and vibrated, and the pouring effect is ensured by controlling the leveling of a small leveling machine.

[0111] During the leveling process, laser scanning is used to obtain all the pits on the concrete surface of the bottom of the box, and the top-view projection area of ​​the i-th pit is recorded as ; Where i represents the number of the pit, i=1,2...I; By analyzing the formula Get the pit occupancy rate of the concrete surface at the bottom of the box ;in, is the total area of ​​the concrete surface at the bottom of the box.

[0112] During the leveling process of the bottom concrete surface, the pit occupancy rate of the bottom concrete surface can be obtained by controlling and calculating the number and depth of the surface pits. , which can more objectively reflect the current leveling effect, relying on the pit occupancy rate of the concrete surface at the bottom of the box Comparison with existing design standard leveling requirements can better judge the current leveling quality.

[0113] If the pit occupies a certain proportion on the concrete surface of the bottom of the box When the depth is less than the set threshold and the maximum depth of each pit is less than the specified depth, the current concrete surface leveling meets the requirements; otherwise, continue leveling and re-measure until the concrete surface leveling of the bottom of the box meets the requirements and the leveling work is completed. At this time, the bottom sealing construction of the box is completed.

[0114] From the above, it can be seen that the foundation prefabricated parts construction quality and safety control system of the present invention relies on the drilling and grouting control unit, the foundation trenching control unit, and the caisson sinking control unit to control the foundation ground support stability and the verticality of the caisson foundation prefabricated parts during the lowering construction of large caisson prefabricated parts, effectively ensuring that the caisson foundation prefabricated parts meet the requirements during the construction process, and at the same time ensuring the stability of the caisson foundation prefabricated parts after construction, avoiding excessive settlement and tilt settlement; the caisson foundation prefabricated parts are initially sunk into place, and the spiral excavation method is used in conjunction with the real-time monitoring of the verticality of the four sides of the caisson foundation prefabricated parts, which can effectively judge the sinking standardization of the caisson foundation prefabricated parts, effectively adjust the excavation position and speed according to the monitoring results, effectively ensure the verticality of the caisson foundation prefabricated parts during construction, and ensure the sinking effect. The foundation prefabricated construction quality and safety management system adopts a multi-factor control method in the process of controlling the caisson foundation prefabricated parts. In the current foundation drilling process, it relies on real-time monitoring and analysis of the drilling load to obtain the strength analysis of the current stratum. At the same time, it cooperates with the calculation of the grouting volume and leakage in the grouting drilling process to analyze the subsequent bearing and support effect of the current stratum. According to the drilling and grouting analysis, the subsequent construction strategy is determined to effectively improve the safety and rationality of the entire construction process; after the caisson foundation prefabricated parts are sunk into place, the method of stacking loads and standing still is adopted to effectively ensure the analysis and calculation of the settlement rate of the entire caisson foundation prefabricated parts within the specified observation period, and effectively obtain the coefficient of change of the caisson settlement rate. After the judgment, the caisson foundation prefabricated parts are in a safe and stable state, ensuring their effective bearing on the fixed buildings on the ground.

[0115] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the protection scope of the present invention.

[0116] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A foundation prefabricated parts construction quality safety control system, characterized by: The system includes: Drilling grouting control unit: used to control the mixing drill to drill holes into the ground foundation and obtain drilling related parameter information in real time, and control the grouting pump to complete grouting according to the drilling related parameter information, and obtain grouting related parameter information in real time; Foundation trenching control unit: used to obtain relevant parameter information during trenching under the foundation ground and control the trenching process; Caisson sinking control unit: used to obtain relevant parameter information of caisson foundation prefabricated parts and dynamic parameter information during the sinking process; Caisson construction safety analysis unit: used to integrate all parameter information obtained from the database and analyze and determine the current caisson foundation prefabricated parts construction quality safety; Database: used to obtain all parameter information of each unit in the system and realize data sharing among the units.

2. A basic prefabricated component construction quality safety control system according to claim 1, characterized in that: The drilling-related parameter information in the drilling and grouting control unit includes the number of foundation holes, elevation depth, and the average load stress corresponding to the mixing drill during the drilling of each foundation hole. ; Grouting related parameter information includes grouting volume , grouting speed, and grouting pressure.

3. A basic prefabricated component construction quality safety control system according to claim 2, characterized in that: The control process of the drilling grouting control unit includes: Obtain drilling design parameters, control the mixing drill to drill N foundation holes along the ground foundation according to the drilling design parameters and make it surround a circle of pile foundation area according to the bottom contour of the caisson foundation prefabricated parts, control the bottom of each foundation hole to extend downward to the elevation depth, and complete the wall protection operation on the inner wall of each foundation hole; Real-time acquisition of the mean load stress of the nth foundation hole during the drilling process of the mixing drill , where n=1,2...N; By analyzing the formula Get the original stratum bearing capacity deviation coefficient of the pile foundation area ;in, is the mean value of load stress of the n+1th foundation hole during the drilling process of the mixing drill; Determine the grouting strategy based on the deviation coefficient of the original stratum bearing capacity: When the formation is fractured, grouting should be performed into each foundation borehole to improve the uniform bearing capacity of the formation. When grouting is carried out directly into the holes of each foundation; Control the grouting speed and pressure, and obtain the grouting volume value in the current nth foundation borehole in real time , where n=1,2...N; By analyzing the formula Get the percentage of grouting leakage in the pile foundation area ;in, is the theoretical total grouting volume; When the percentage of grouting leakage If it meets the requirements, the bearing capacity of the stratum in the pile foundation area after the current grouting meets the requirements, and the subsequent foundation trenching operation can be continued after the grouting is completely dried; Otherwise, it is judged that there is excessive leakage in the stratum of the pile foundation area after the current grouting, and at least one row of foundation piles must be added on the outer ground foundation of the caisson foundation prefabricated parts to be hoisted in subsequently. The depth of each foundation pile is the elevation depth to prevent soil and sand loss during excavation.

4. A basic prefabricated component construction quality safety control system according to claim 3, characterized in that: The control process of the basic trenching control unit includes: Control the excavator to dig a groove downwards on the foundation ground in the pile foundation area surrounded by the foundation holes after grouting; During the trenching process, the excavator is controlled to dig the trench spirally from the center to the surroundings, and gradually dig the trench to the required depth; After the trench is dug to the required depth, the vertical trench walls are leveled and the verticality between adjacent trench walls is maintained; Control the leveling machine to level the bottom of the groove. After leveling, control the laser scanner to obtain the flatness of the bottom of the groove and maintain the verticality with the groove wall around it. After reaching the standard, the bottom of the groove is leveled. After the trench bottom is leveled, a ring beam for guidance is set up on the leveled foundation ground around the trench, and verticality measuring instruments are installed on the four sides of the top of the ring beam, waiting for the caisson foundation prefabricated parts to be hoisted in.

5. A basic prefabricated component construction quality safety control system according to claim 4, characterized in that: The control process of the caisson sinking control unit includes: Control the crane to hoist the caisson foundation prefabricated parts to the top of the trench, and use manual assistance to straighten them during the sinking process; Control the crane to lower the caisson foundation prefabricated parts and make them sink to the bottom of the trench under the guidance of the ring beam; The inclination angles of the four sides of the caisson foundation prefabricated parts are obtained by the verticality measuring instrument and recorded as ; according to Numerical determination of the inclination direction of the current caisson foundation prefabricated component; Control the long-arm excavator to continue excavating the earth at the bottom of the trench. Each excavation is 2m long, 0.5m deep and 1m wide. When a width of 5m-6m is reserved around the bottom of the trench, switch to a small excavator to continue excavating. After each excavation, let it stand for 3-5 minutes, and then obtain the inclination angles of the vertical surfaces around the caisson foundation prefabricated parts again, and record them as ; Through the following analysis formulas , , , Obtain the inclination angle change values ​​of each facade around the caisson foundation prefabricated component respectively; According to the obtained values ​​of the change of each inclination angle, the inclination return rate of the caisson foundation prefabricated component is judged, and then the remaining excavation times are predicted and the excavation is continued; After excavation to the preset elevation, determine whether the verticality of the current caisson foundation prefabricated parts meets the standard; When the verticality meets the standard, the sinking operation of the current caisson foundation prefabricated components is completed.

6. A basic prefabricated component construction quality safety control system according to claim 5, characterized in that: After the sinking operation of the current caisson foundation prefabricated parts is completed, the crane is controlled to adjust the uniformity of the height difference of the caisson foundation prefabricated parts by stacking loads on the four corners of the top of the caisson foundation prefabricated parts and leaving them stationary.

7. A basic prefabricated component construction quality safety control system according to claim 6, characterized in that: The construction control process of the caisson construction safety analysis unit includes: Obtain the heap load and the change of the heap load at the top four corners of the caisson foundation prefabricated parts during the static process; When the pile load reaches the set requirement, keep it still and observe the caisson settlement once every 24 hours. m , where m=1,2...M; m is the number of the current observation, and M is the total number of observations; By analyzing the formula The coefficient of variation of caisson settlement rate is obtained; where, represents the caisson settlement at the m+1th observation, represents the caisson settlement at the mth observation, represents the settlement of the caisson at the m-1th observation; By observing the coefficient of change of settlement rate of each caisson, the settlement stability of the current caisson foundation prefabricated parts under the action of heap load is determined; When the specified loading time is reached, if the coefficient of variation of the caisson settlement rate is less than the standard value, the current caisson foundation prefabricated parts are in a safe and stable state; otherwise, the current caisson foundation prefabricated parts have excessive settlement; If the caisson foundation prefabricated parts have excessive settlement, at least one row of foundation piles shall be constructed outside the caisson foundation prefabricated parts; After the construction of the front row of foundation piles is completed, continue to repeatedly observe the coefficient of variation of the settlement rate of each caisson until the coefficient of variation of the settlement rate of the caisson is less than the specification value.

8. A basic prefabricated component construction quality safety control system according to claim 7, characterized in that: When it is determined that the current caisson foundation prefabricated part is in a safe and stable state, the sand and gravel foundation is backfilled at the bottom of the box inside the caisson foundation prefabricated part and rolled to level it; Tie the steel bar frame at the bottom of the box, go through each node of the steel bar frame and ensure that all of them are welded or tied in place; Control the pouring equipment to pour concrete into the steel frame and keep vibrating; After pouring is completed, control the small leveling machine to go down and complete the leveling; During the leveling process, laser scanning is used to obtain all the pits on the concrete surface of the bottom of the box, and the top-view projection area of ​​the i-th pit is recorded as ; Wherein, i represents the number of the pit, i=1,2...I; By analyzing the formula Get the pit occupancy rate of the concrete surface at the bottom of the box ;in, is the total area of ​​the concrete surface at the bottom of the box; If the pit occupies a certain proportion on the concrete surface of the bottom of the box When it is less than the set threshold and the maximum depth of each pit is less than the specified depth, the current concrete surface leveling meets the requirements; Otherwise, continue leveling and re-measure until the concrete surface of the bottom of the box is leveled to meet the requirements. At this time, the bottom sealing construction of the box is completed.

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