Foundation pit stand column top end elevation control device and method

Abstract

The invention discloses a foundation pit stand column top end elevation control device and method, and relates to the technical field of foundation pit engineering. The foundation pit stand column top end elevation control device comprises a height adjusting assembly which is used for being arranged on a steel latticed column and dividing the steel latticed column into an upper-layer steel latticed column and a lower-layer steel latticed column so that the elevation of the upper-layer steel latticed column can be adjusted through the height adjusting assembly; the control assembly is electrically connected with the height adjusting assembly, and the control assembly is used for controlling the height adjusting assembly; the monitoring assembly is used for monitoring the elevation of the upper-layer steel latticed column; the numerical control terminal is electrically connected with the control assembly and electrically connected with the monitoring assembly. The numerical control terminal sends a signal to the control assembly, and the control assembly controls the height adjusting assembly to reduce the elevation of the upper-layer steel latticed column until the monitored elevation recovers to the initial value, so that the control device can reduce the shearing force of the joint of the supporting cross beam and the stand column when the bottom of the foundation pit bulges.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit engineering, and particularly relates to a device and method for controlling the elevation of the top of a foundation pit column. Background Art

[0002] As the basic support for the development of underground space, the construction process of deep foundation pit engineering is full of uncertainties, complexities and concealments. In addition, the construction environment is limited and vulnerable to the influence of surrounding factors, which significantly increases the engineering difficulty.

[0003] In deep and large foundation pit projects, the uplift phenomenon at the bottom of the foundation pit is a problem that cannot be ignored. The degree of uplift is affected by multiple factors such as the size of the foundation pit, the excavation depth and the geological conditions, and may show a diverse distribution, such as a large amount of uplift in the center and a small amount of uplift near the retaining pile, or vice versa. To address this challenge, deep and large foundation pits often adopt a reinforced concrete internal support structure, and columns are set at the intersection points of the transverse support beams to enhance stability; among them, the columns usually adopt the form of steel lattice columns plus concrete column piles, and the bottom end of the steel lattice column penetrates into the internal part of the concrete column pile to adapt to the shape change of the foundation pit and meet the high requirements of the surrounding environment at the same time.

[0004] However, when the bottom of the foundation pit undergoes uplift, the columns will be lifted to different degrees due to different degrees of uplift, which directly leads to a sharp increase in the shear force at the connection node between the support beam and the column; in extreme cases, the support beam may be damaged due to excessive shear force, which may further cause overall instability and seriously threaten the construction safety. Summary of the Invention

[0005] Aiming at the defects existing in the prior art, the technical problem solved by the present invention is: how to reduce the shear force at the connection node between the support beam and the column when the bottom of the foundation pit undergoes uplift.

[0006] To achieve the above object, in a first aspect, the device for controlling the elevation of the top of a foundation pit column provided by the present invention includes: A height adjustment component, which is used to be arranged on the steel lattice column and divides the steel lattice column into an upper steel lattice column and a lower steel lattice column. The upper steel lattice column is located at the top of the height adjustment component, and the lower steel lattice column is located at the bottom of the height adjustment component; A control component, which is electrically connected to the height adjustment component, and the control component is used to control the height adjustment component; A monitoring component, which is used to monitor the elevation of the upper steel lattice column; A numerical control terminal, which is electrically connected to the control component and electrically connected to the monitoring component, so as to realize obtaining the data collected by the monitoring component through the numerical control terminal and sending the collected data to the control component.

[0007] By adopting the above technical solution, the elevation of the upper steel lattice column, that is, the elevation of the top of the column, is monitored in real time by the monitoring component, and the collected monitoring results are sent to the numerical control terminal. During the process of excavating the foundation pit, when the bottom of the foundation pit bulges, some of the collected monitoring results will change, indicating that some columns are lifted. At this time, the shear force at the joint between the support cross beam and the column increases. Therefore, the numerical control terminal sends a signal to the control component, and the control component controls the height adjustment component to reduce the elevation of the upper steel lattice column until the monitored elevation returns to the initial value. Therefore, this control device can reduce the shear force at the joint between the support cross beam and the column when the bottom of the foundation pit bulges.

[0008] In one embodiment, the height adjustment component includes a base, a lifting member, and a driving member. The base is used to be arranged at the top of the lower steel lattice column. The lifting member is arranged on the top of the base and is used to be located at the bottom end of the upper steel lattice column. The driving member is electrically connected to the control component to realize the driving member driving the lifting member to rise or fall.

[0009] By adopting the above technical solution, it is convenient to arrange the height adjustment component between the top of the lower steel lattice column and the bottom end of the upper steel lattice column. By the rising and falling of the lifting member, the elevation of the upper steel lattice column is driven to change.

[0010] In one embodiment, the lifting member includes a guide post and a lifting platform. A plurality of guide posts are vertically arranged on the base. A plurality of sliding holes are formed on the lifting platform. The guide posts correspond to the sliding holes one by one, and the guide posts pass through the sliding holes to realize the movement of the lifting platform along the arrangement direction of the guide posts. The top surface of the lifting platform abuts against the bottom end of the upper steel lattice column, and the end of the guide post far away from the base is used to be arranged inside the limit guide hole of the upper steel lattice column.

[0011] By adopting the above technical solution, the guide post can not only improve the stability of the fixation between the height adjustment component and the lattice column, but also play a guiding role for the lifting of the lifting platform, thereby improving the stability and accuracy of the change of the elevation of the upper steel lattice column.

[0012] In one embodiment, the driving member includes a cylinder and a fixed seat. The cylinder is fixed to the top of the lower steel lattice column through the fixed seat. A first telescopic rod is arranged on the cylinder. One end of the first telescopic rod is connected to the cylinder, and the other end of the first telescopic rod abuts against the bottom surface of the lifting platform. The cylinder is electrically connected to the control component.

[0013] By adopting the above technical solution, when the height adjustment component needs to work, the cylinder is controlled by the control component, and the first telescopic rod of the cylinder extends or contracts to change the distance that the first telescopic rod extends from the cylinder, so as to make the lifting platform rise or fall. Therefore, the above design facilitates the adjustment of the elevation of the upper steel lattice column.

[0014] In one embodiment, a plurality of positioning holes are formed along the direction of the guiding column, and a locking assembly is arranged on the lifting table. The plurality of positioning holes are selectively connected to the locking assembly to realize the movement and fixation of the lifting table on the guiding column.

[0015] By adopting the above technical solution, it is convenient for the lifting table to move and be fixed on the guiding column, ensuring the smoothness of the lifting table during the moving state and the stability during the static state, and avoiding the lowering of the lifting table caused by the weight, thereby causing adjustment errors.

[0016] In one embodiment, the locking assembly includes an installation groove, a bidirectional hydraulic cylinder and a movable hole. The installation groove is formed on the top surface of the lifting table. The end of the installation groove faces the same direction as the opening direction of the positioning hole, and movable holes are formed at both ends of the installation groove. One end of the movable hole is communicated with the installation groove, and the other end of the movable hole is communicated with the positioning hole. The bidirectional hydraulic cylinder is arranged inside the installation groove, and the second telescopic rods at both ends of the bidirectional hydraulic cylinder are movably arranged inside the movable hole to realize the clamping and separation of the second telescopic rods and the positioning holes.

[0017] By adopting the above technical solution, the bidirectional hydraulic cylinder can be directly controlled by the control component. The second telescopic rods at the ends of the bidirectional hydraulic cylinder extend and retract inside the movable hole. Since the movable hole is communicated with the positioning hole and the end of the installation groove faces the same direction as the opening direction of the positioning hole, the second telescopic rods can be clamped and separated from the positioning holes.

[0018] In one embodiment, a pressure sensor is arranged on the top surface of the lifting table, and the pressure sensor is electrically connected to the numerical control terminal to realize the monitoring of the pressure of the upper steel lattice column on the lifting table.

[0019] By adopting the above technical solution, the stress condition and adjustment stability of the upper steel lattice column during the construction process can be monitored.

[0020] In one embodiment, the monitoring component includes a GPS elevation measuring instrument, a tensile stress sensor and a signal collector. The GPS elevation measuring instrument and the tensile stress sensor are both used to be arranged on the top surface of the uppermost support beam and directly above the center line of the upper steel lattice column. The GPS elevation measuring instrument is wirelessly connected to the numerical control terminal, the tensile stress sensor is electrically connected to the signal collector, and the signal collector is electrically connected to the numerical control terminal.

[0021] By adopting the above technical solution, the elevation of the upper steel lattice column is monitored by the GPS elevation measuring instrument, whether there is tensile stress on the top surface of the uppermost support beam is monitored by the tensile stress sensor, and the monitoring results are judged by the two data at the same time, thereby improving the accuracy of the monitoring results.

[0022] In one embodiment, the monitoring component further includes a GPS calibration device to improve the elevation measurement accuracy of the GPS altimeter.

[0023] By adopting the above technical solution, traditional GPS measurement devices can only measure elevation change data at the level of "m". If the elevation measurement consists of two GPS measurement devices, one installed on the object to be measured and the other installed at a fixed point for assistance, the GPS device installed on the object to be measured can achieve the measurement of elevation changes at the level of "cm", thereby further improving the accuracy of the monitoring results.

[0024] Second, the method for controlling the elevation of the top of the foundation pit column provided by the present invention includes the following steps: Provide the elevation control device for the top of the foundation pit column as described above; Set a preset elevation A and a tensile stress alarm value C; Collect the elevation data B of the upper steel lattice column at each measuring point and the tensile stress D on the top surface of the uppermost support beam; Judge whether the absolute value of the difference between B and A exceeds the threshold; If the absolute value of the difference between B and A exceeds the threshold, when the difference between B and A is positive, the upper steel lattice column is lowered through the height adjustment component until the lowered elevation value is equal to the difference, and the height adjustment component stops working; when the difference between B and A is negative, the upper steel lattice column is raised through the height adjustment component until the raised elevation value is equal to the difference, and the height adjustment component stops working; otherwise, the height adjustment component always stops working; Judge whether D exceeds C; If D exceeds C, the alarm is turned on, manual review is carried out, and the elevation of the upper steel lattice column is adjusted through the height adjustment component until the alarm is turned off, and then judge again whether the absolute value of the difference between B and A exceeds the threshold; otherwise, directly judge again whether the absolute value of the difference between B and A exceeds the threshold; Repeat the above steps until the foundation pit construction is completed.

[0025] By adopting the above technical solution, the elevation of the upper steel lattice column, that is, the elevation of the top of the column, is monitored in real time through the monitoring component, and the collected monitoring results are sent to the numerical control terminal. During the process of excavating the foundation pit, when the bottom of the foundation pit bulges, some of the collected monitoring results will change, indicating that some columns are lifted. At this time, the shear force at the connection node between the support beam and the column increases. Therefore, the numerical control terminal sends a signal to the control component, and the control component controls the height adjustment component to lower the elevation of the upper steel lattice column until the monitored elevation returns to the initial value. Therefore, this control device can reduce the shear force at the connection node between the support beam and the column when the bottom of the foundation pit bulges.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The elevation of the upper steel lattice column, i.e., the elevation of the top of the column, is monitored in real time by the monitoring component, and the collected monitoring results are sent to the numerical control terminal. During the excavation of the foundation pit, when the bottom of the foundation pit bulges, some of the collected monitoring results will change, indicating that some columns are lifted. At this time, the shear force at the intersection node of the support beam and the column increases. Therefore, the numerical control terminal sends a signal to the control component, and the control component controls the height adjustment component to reduce the elevation of the upper steel lattice column until the monitored elevation returns to the initial value. Therefore, this control device can reduce the shear force at the intersection node of the support beam and the column when the bottom of the foundation pit bulges; 2. Through the design of the guide column and the locking component, the stability of the fixation between the height adjustment component and the steel lattice column can be improved by the guide column, and it also plays a guiding role in the lifting of the lifting platform. At the same time, the locking component can be locked and separated from the positioning hole on the guide column, thus ensuring the smoothness of the lifting platform during the moving state and the stability during the stationary state; 3. Through the design of the monitoring component, including a GPS elevation measuring instrument, a tensile stress sensor, a signal collector, and a GPS calibration device, the accuracy of the monitoring results is improved, so as to perform more accurate adjustment, and thus further reduce the shear force at the intersection node of the support beam and the column. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the elevation control device for the top of the foundation pit column in the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the column in the embodiment of the present invention; Figure 3 For Figure 2 The enlarged view of part A; Figure 4 It is a schematic structural diagram of the height adjustment component in the embodiment of the present invention; Figure 5 It is a flowchart of the elevation control method for the top of the foundation pit column in the embodiment of the present invention.

[0028] In the figure: 1 - height adjustment component, 101 - base, 102 - lifting platform, 103 - guide column, 104 - sliding hole, 105 - cylinder, 106 - fixed seat, 107 - positioning groove, 108 - positioning hole, 109 - locking component, 1091 - moving hole, 1092 - installation groove, 1093 - double - acting hydraulic cylinder, 1010 - pressure sensor, 2 - upper steel lattice column, 201 - limit guide hole, 3 - lower steel lattice column, 4 - concrete column pile, 5 - control component, 6 - monitoring component, 601 - signal collector, 602 - GPS elevation measuring instrument, 603 - tensile stress sensor, 7 - numerical control terminal, 8 - GPS calibration device, 9 - support beam. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0030] The top elevation control device of the foundation pit column in the embodiment of the present invention is shown in FIG. Figure 1 , 2 As shown, the elevation control device for the top of the foundation pit column includes a height adjustment component 1, which is used to be set on the steel lattice column, and divides the steel lattice column into an upper steel lattice column 2 and a lower steel lattice column 3, the upper steel lattice column 2 is located at the top of the height adjustment component 1, and the lower steel lattice column 3 is located at the bottom of the height adjustment component 1, so as to adjust the elevation of the upper steel lattice column 2 by the height adjustment component 1; a control component 5, which is electrically connected to the height adjustment component 1 and is used to control the height adjustment component 1; a monitoring component 6, which is used to monitor the elevation of the upper steel lattice column 2; a numerical control terminal 7, which is electrically connected to the control component 5 and to the monitoring component 6, so as to obtain data collected by the monitoring component 6 through the numerical control terminal 7, and send the collected data to the control component 5.

[0031] It can be seen that the present invention divides the steel lattice columns into upper steel lattice columns 2 and lower steel lattice columns 3, and sets a height adjustment component 1 between the upper steel lattice columns 2 and the lower steel lattice columns 3. The bottom of the lower steel lattice column 3 is inserted into the concrete column pile 4, and the elevation of the upper steel lattice column 2, that is, the elevation of the top of the column is monitored in real time by the monitoring component 6, and the collected monitoring results are sent to the numerical control terminal 7. During the excavation of the foundation pit, when the bottom of the foundation pit bulges, some of the collected monitoring results will change, indicating that some columns are lifted up. At this time, the shear force at the intersection of the supporting beam and the column increases. Therefore, the numerical control terminal 7 sends a signal to the control component 5, and the control component 5 controls the height adjustment component 1 to reduce the elevation of the upper steel lattice column 2 until the monitored elevation returns to the initial value. Therefore, the control device can reduce the shear force at the intersection of the supporting beam and the column when the bottom of the foundation pit bulges.

[0032] It should be noted that the preliminary construction process of foundation pit excavation is as follows: Drill holes at preset points. After the holes are formed, concrete column piles are poured at the bottom of the holes. Before the concrete column piles are completely solidified, the height adjustment component 1, the upper steel lattice column 2 and the lower steel lattice column 3 are assembled on the ground, and the height adjustment component 1 is electrically connected to the control component 5. The assembled structure is inserted into the top of the unsolidified concrete column pile and wait for the concrete column pile to be completely solidified. Among them, the diameter of the hole needs to be larger than the width of the height adjustment component 1 to avoid affecting the operation of the height adjustment component 1.

[0033] Preferably, see Figure 2 , 3As shown in the figure, a specific structure of the height adjustment component 1 is provided: The height adjustment component 1 includes a base 101, a lifting member, and a driving member. The base 101 is used to be arranged at the top of the lower steel lattice column 3. The lifting member is arranged on the top of the base 101 and is used to be located at the bottom end of the upper steel lattice column 2. The driving member is electrically connected to the control component 5 to realize the driving member driving the lifting member to rise or fall.

[0034] Specifically, after the concrete column pile 4 and the lower steel lattice column 3 are installed inside the borehole of the foundation pit, the base 101 of the height adjustment component 1 is fixed to the top of the lower steel lattice column 3. The driving member drives the lifting member to work, and the lifting member drives the upper steel lattice column 2 at its top to move. Therefore, the above design facilitates the arrangement of the height adjustment component 1 between the top of the lower steel lattice column 3 and the bottom end of the upper steel lattice column 2. By the rise and fall of the lifting member, the elevation of the upper steel lattice column 2 is driven to change.

[0035] Further, referring to Figure 3 、 4 As shown in the figure, a specific structure of the lifting member is provided: The lifting member includes a guide post 103 and a lifting platform 102. A plurality of guide posts 103 are vertically arranged on the base 101. A plurality of sliding holes 104 are formed on the lifting platform 102. The guide posts 103 correspond to the sliding holes 104 one by one, and the guide posts 103 penetrate through the sliding holes 104 to realize the movement of the lifting platform 102 along the arrangement direction of the guide posts 103. The top surface of the lifting platform 102 abuts against the bottom end of the upper steel lattice column 2. The end of the guide post 103 away from the base 101 is used to be arranged inside the limit guide hole 201 of the upper steel lattice column 2.

[0036] Specifically, a vertical guide post 103 is installed at each of the four corners of the base 101. One end of the guide post 103 is fixedly connected to the top surface of the base 101, or this end of the guide post 103 penetrates through the base 101 and is fixedly connected to the top of the lower steel lattice column 3. Sliding holes 104 are respectively formed at the four corners of the lifting platform 102. The guide posts 103 correspond to the sliding holes 104 one by one, and the guide posts 103 pass through the corresponding sliding holes 104. The lifting platform 102 can rise or fall along the guide posts 103. Since the top surface of the lifting platform 102 abuts against the bottom end of the upper steel lattice column 2, the movement of the lifting platform 102 can drive the upper steel lattice column 2 to move, thereby adjusting the elevation of the upper steel lattice column 2. The other end of the guide post 103 penetrates through the limit guide hole 201 of the upper steel lattice column 2 to prevent the inclination and falling off of the guide post 103. The guide post 103 can not only improve the stability of the fixation between the height adjustment component 1 and the steel lattice column, but also play a guiding role for the lifting of the lifting platform 102, thereby improving the stability and accuracy of the elevation change of the upper steel lattice column 2.

[0037] Further, refer to Figure 4 as shown, a specific structure of the driving member is provided: The driving member includes a cylinder 105 and a fixing base 106. The cylinder 105 is fixed to the top end of the lower steel lattice column 3 through the fixing base 106. A first telescopic rod is arranged on the cylinder 105. One end of the first telescopic rod is connected to the cylinder 105, and the other end of the first telescopic rod abuts against the bottom surface of the lifting platform 102. The cylinder 105 is electrically connected to the control component 5.

[0038] Specifically, the cylinder 105 is fixed to the top end of the lower steel lattice column 3 through the fixing base 106 and a bolt assembly. A fixing plate can be installed at the top end of the lower steel lattice column 3 to enhance the stability of the installation of the cylinder 105. The first telescopic rod of the cylinder 105 is vertically arranged at the top of the cylinder 105. The end of the first telescopic rod away from the cylinder 105 abuts against the bottom surface of the lifting platform 102. When the height adjustment component 1 needs to work, the cylinder 105 is controlled by the control component 5, and the first telescopic rod of the cylinder 105 extends or contracts to change the distance that the first telescopic rod extends from the cylinder 105, so as to raise or lower the lifting platform 102. Therefore, the above design facilitates the adjustment of the elevation of the upper steel lattice column 2. To maintain the stability of the top push of the first telescopic rod on the lifting platform 102, the first telescopic rod can be arranged directly below the center point of the lifting platform 102, or multiple cylinders 105 and first telescopic rods can be arranged to push multiple points on the top surface of the lifting platform 102 at the same time.

[0039] Preferably, refer to Figure 4 as shown, a plurality of positioning holes 108 are formed in the guiding column 103 along its arrangement direction. A locking component 109 is arranged on the lifting platform 102. One of the plurality of positioning holes 108 is selectively connected to the locking component 109 to realize the movement and fixation of the lifting platform 102 on the guiding column 103.

[0040] Specifically, a vertical positioning groove 107 is formed in the guiding column 103, and a plurality of positioning holes 108 are formed in the vertical direction in the positioning groove 107. The distance between two adjacent positioning holes 108 can be the same or different, and the specific spacing can be designed according to actual needs. A locking component 109 that can match the positioning holes 108 is arranged on the lifting platform 102. When it is required to fix the lifting platform 102, the locking component 109 is locked with one or more of the positioning holes 108. When it is required to move the lifting platform 102 on the guiding column 103, the locking component 109 is separated from the positioning holes 108. It is convenient for the lifting platform 102 to move and be fixed on the guiding column 103, ensuring the smoothness of the lifting platform 102 during the moving state and the stability during the static state, and avoiding the lowering of the lifting platform 102 due to the weight, thus causing adjustment errors.

[0041] Further, refer to Figure 4As shown in the figure, a specific structure of the locking assembly 109 is provided: The locking assembly 109 includes an installation groove 1092, a double-acting hydraulic cylinder 1093, and a movable hole 1091. The installation groove 1092 is opened on the top surface of the lifting platform 102. The end of the installation groove 1092 faces the same direction as the opening direction of the positioning hole 108. Both ends of the installation groove 1092 are provided with movable holes 1091. One end of the movable hole 1091 communicates with the installation groove 1092, and the other end of the movable hole 1091 communicates with the positioning hole 108. The double-acting hydraulic cylinder 1093 is arranged inside the installation groove 1092, and the second telescopic rods at both ends of the double-acting hydraulic cylinder 1093 are movably arranged inside the movable hole 1091 to realize the clamping and separation of the second telescopic rod and the positioning hole 108.

[0042] Specifically, two installation grooves 1092 are opened on the top surface of the lifting platform 102. The ends of the installation grooves 1092 are arranged opposite to the openings of the positioning holes 108, that is, guide columns 103 are arranged at both ends of the installation grooves 1092. One end of the installation groove 1092 is arranged opposite to the opening of the positioning hole 108 of one of the guide columns 103, and the other end of the installation groove 1092 is arranged opposite to the opening of the positioning hole 108 of the other guide column 103. Movable holes 1091 are opened on the inner walls at the ends of the installation grooves 1092. One end of the movable hole 1091 communicates with the installation groove 1092, and the other end of the movable hole 1091 communicates with the positioning hole 108. A double-acting hydraulic cylinder 1093 is fixed inside each installation groove 1092, and the second telescopic rods at both ends of the double-acting hydraulic cylinder 1093 are movably arranged inside the movable holes 1091. The double-acting hydraulic cylinder 1093 can be directly controlled by the control assembly 5. The second telescopic rods at the ends of the double-acting hydraulic cylinder 1093 extend and retract inside the movable holes 1091. Since the movable holes 1091 communicate with the positioning holes 108 and the end of the installation groove 1092 faces the same direction as the opening direction of the positioning hole 108, the second telescopic rod can be clamped and separated from the positioning hole 108.

[0043] Preferably, as shown in Figure 4 the figure, a pressure sensor 1010 is arranged on the top surface of the lifting platform 102, and the pressure sensor 1010 is electrically connected to the numerical control terminal 7 to monitor the pressure of the upper steel lattice column 2 on the lifting platform 102.

[0044] Specifically, during the lifting process, the pressure sensor 1010 installed on the lifting platform 102 monitors its working state and stress conditions in real time; when an abnormal situation is detected, such as when the monitored pressure exceeds the preset range, the cylinder 105 will automatically stop working and send an alarm signal to ensure construction safety; when the monitored pressure is lower than the preset range, the cylinder 105 will automatically stop working, and it is necessary to check whether the pushing of the lifting platform 102 against the upper steel lattice column 2 is normal.

[0045] Preferably, the monitoring component 6 includes a GPS altimeter 602, a tensile stress sensor 603, and a signal collector 601. The GPS altimeter 602 and the tensile stress sensor 603 are both configured to be disposed on the top surface of the uppermost support beam 9 and directly above the center line of the upper steel lattice column 2. The GPS altimeter 602 is wirelessly connected to the numerical control terminal 7, the tensile stress sensor 603 is electrically connected to the signal collector 601, and the signal collector 601 is electrically connected to the numerical control terminal 7.

[0046] Furthermore, the monitoring component 6 further includes a GPS calibration device 8 to improve the elevation measurement accuracy of the GPS altimeter 602.

[0047] Specifically, the GPS calibration altimeter is accurately installed at a fixed position outside the foundation pit to ensure that it can receive stable and accurate GPS signals; the GPS calibration altimeter is connected to the terminal controller and the GPS altimeter 602 wirelessly, and this wireless connection can be achieved through wireless communication technologies such as Wi-Fi, Zigbee, or LoRa; before the excavation of the foundation pit and the construction of the support structure begin, the GPS calibration altimeter is used to perform an initial calibration on the GPS altimeter 602, and the purpose of this step is to ensure that the GPS altimeter 602 has achieved high precision before starting the monitoring; during the excavation of the foundation pit and the construction of the support structure, as well as in the subsequent monitoring phase, the GPS calibration altimeter will regularly calibrate the GPS altimeter 602 to compensate for measurement errors that may be caused by environmental changes (such as temperature changes, atmospheric condition changes, etc.); the GPS altimeter 602 will continuously collect data on the deformation of the foundation pit and wirelessly transmit these data to the terminal controller; at the same time, the GPS calibration altimeter will also transmit the GPS signal data (for calibration) it receives to the terminal controller; after receiving the data, the terminal controller will use the built-in software algorithm to calibrate and analyze the data collected by the GPS altimeter 602, and the purpose of this step is to extract useful deformation information from the original data and eliminate errors caused by various factors; these processing steps are aimed at improving the accuracy and reliability of the data for more precise measurement and decision-making; The elevation of the upper steel lattice column 2 is monitored by the GPS altimeter 602, and whether there is tensile stress on the top surface of the uppermost support beam 9 is monitored by the tensile stress sensor 603. The monitoring results are judged by these two data simultaneously, thereby improving the accuracy of the monitoring results.

[0048] It should be noted that traditional GPS measurement devices can only measure elevation change data at the level of "m". If the elevation measurement consists of two GPS measurement devices, one installed on the object to be measured and the other installed at a fixed point for assistance, the GPS device installed on the object to be measured can achieve elevation change measurement at the "cm" level, thereby further improving the accuracy of the monitoring results.

[0049] The method for controlling the elevation of the top of the foundation pit column in the embodiment of the present invention, as shown in Figure 5 the following steps are included: Provide an elevation control device for the top of the foundation pit column; According to the construction requirements and calculations, set the preset elevation A and the tensile stress alarm value C; Collect the elevation data B of the upper steel lattice column 2 at each measuring point through the GPS elevation measuring instrument 602, collect the tensile stress D on the top surface of the uppermost support beam 9 at each measuring point through the tensile stress sensor 603, and send the collected data to the numerical control terminal 7; Judge whether the absolute value of the difference between B and A exceeds the threshold value, where the threshold value is the measurement redundancy of the elevation, and the threshold value can be designed according to the construction requirements; If the absolute value of the difference between B and A exceeds the threshold value, when the difference between B and A is positive, lower the upper steel lattice column 2 through the height adjustment component 1 until the lowered elevation value is equal to the difference, and the height adjustment component 1 stops working; when the difference between B and A is negative, raise the upper steel lattice column 2 through the height adjustment component 1 until the raised elevation value is equal to the difference, and the height adjustment component 1 stops working; otherwise, the height adjustment component 1 always stops working; Judge whether D exceeds C; If D exceeds C, the alarm is turned on, manual verification is carried out, and the elevation of the upper steel lattice column 2 is adjusted through the height adjustment component 1 until the alarm is turned off, and then judge again whether the absolute value of the difference between B and A exceeds the threshold value; otherwise, directly judge again whether the absolute value of the difference between B and A exceeds the threshold value; Repeat the above steps until the foundation pit construction is completed.

[0050] It can be seen from this that in the present invention, the steel lattice column is divided into an upper steel lattice column and a lower steel lattice column, and a height adjustment component is arranged between the upper steel lattice column and the lower steel lattice column. The bottom of the lower steel lattice column is inserted into the concrete column pile. The elevation of the upper steel lattice column, that is, the elevation of the top of the column, is monitored in real time by the monitoring component, and the collected monitoring results are sent to the numerical control terminal. During the process of excavating the foundation pit, when the bottom of the foundation pit bulges, some of the collected monitoring results will change, indicating that some columns are lifted. At this time, the shear force at the joint between the support cross beam and the column increases. Therefore, the numerical control terminal sends a signal to the control component, and the control component controls the height adjustment component to lower the elevation of the upper steel lattice column until the monitored elevation returns to the initial value. Therefore, this control device can reduce the shear force at the joint between the support cross beam and the column when the bottom of the foundation pit bulges.

[0051] Preferably, the GPS elevation measuring instruments and tensile stress sensors installed at each measuring point collect data according to a preset collection frequency; the GPS elevation measuring instruments transmit the elevation data to the numerical control terminal in real time through a wireless method (such as Wi-Fi, Zigbee, LoRa, etc.); the tensile stress sensors transmit the tensile stress data to the numerical control terminal in real time through a wired method (such as RS, CAN bus, etc.); the terminal controller maintains a data reception status table to record the timestamp of the most recent data reception at each measuring point; by setting a predetermined time threshold for judging whether the data reception times out, this time threshold is usually based on the cycle of data collection and transmission and takes into account a certain amount of redundant time to ensure that false alarms will not occur during network delays or short-term equipment failures; the numerical control terminal regularly checks the data reception status table, and marks the monitoring points where data has not been received for more than the predetermined time threshold as a fault status; when a fault status is detected, the numerical control terminal immediately issues a fault warning, and the warning information can include the identification of the faulty measuring point, the time of the fault occurrence, and the possible fault type (such as communication fault, equipment fault, etc.); by introducing the fault self-checking function, not only the normal data collection and transmission are realized, but also the reliability and stability of the system are enhanced. When a fault occurs, the system can detect it in time and issue a warning, which is convenient for the operator to quickly locate and solve the fault, ensuring the continuity and accuracy of the elevation control process of the foundation pit column top.

[0052] Preferably, on the above basis, a data storage device is designed, including a data receiving interface, a data storage unit, a data analysis engine, a data access interface, etc.; the data receiving interface is used to receive real-time data from each measuring point, including elevation data, tensile stress data, etc.; the data storage unit is responsible for storing the received data into the database according to a predetermined format and rules; the data analysis engine is used to preprocess, analyze and generate reports on the stored data; the data access interface provides operations such as querying, modifying and deleting the stored data; according to the data storage requirements, a reasonable database structure is designed, including table structure, index, relationship, etc.; a suitable database management system (DBMS) is selected, such as MySQL, PostgreSQL or SQLite, etc., to meet the performance requirements of data storage and access; the received data is preprocessed, including data cleaning, format conversion and outlier monitoring, etc., to improve the data quality; by storing the preprocessed data into the database, including information such as elevation data, tensile stress data, adjustment amount and adjustment time, etc.; ensure that each data of each measuring point has a unique identifier for subsequent data query and analysis; regularly update and maintain the database, including data backup, data cleaning and data migration, etc.; monitor the running state of the database, and timely discover and solve potential problems, such as data loss, data corruption or performance degradation, etc.; use the data analysis engine to deeply analyze the stored data, including trend analysis, correlation analysis and anomaly monitoring, etc.; through analysis, identify the key problems and potential risks in the elevation adjustment process, and provide a basis for subsequent adjustment and optimization.

[0053] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A device for controlling the elevation of the top of a foundation pit column, characterized in that, It includes: A height adjustment component (1) for being arranged on a steel lattice column and separating the steel lattice column into an upper steel lattice column (2) and a lower steel lattice column (3). The upper steel lattice column (2) is located at the top of the height adjustment component (1), and the lower steel lattice column (3) is located at the bottom of the height adjustment component (1); A control component (5) electrically connected to the height adjustment component (1), and the control component (5) is used to control the height adjustment component (1); A monitoring component (6) for monitoring the elevation of the upper steel lattice column (2); A numerical control terminal (7) electrically connected to the control component (5) and electrically connected to the monitoring component (6) to realize obtaining the data collected by the monitoring component (6) through the numerical control terminal (7) and sending the collected data to the control component (5).

2. The elevation control device for the top of the foundation pit column according to claim 1, characterized in that: The height adjustment component (1) includes a base (101), a lifting member and a driving member. The base (101) is used to be arranged at the top of the lower steel lattice column (3). The lifting member is arranged on the top of the base (101) and is used to be located at the bottom end of the upper steel lattice column (2). The driving member is electrically connected to the control component (5) to realize the driving member driving the lifting member to rise or fall.

3. The top elevation control device for the foundation pit column according to claim 2, wherein: The lifting member includes a guide post (103) and a lifting platform (102). A plurality of guide posts (103) are vertically arranged on the base (101). A plurality of sliding holes (104) are formed in the lifting platform (102). The guide posts (103) correspond to the sliding holes (104) one by one, and the guide posts (103) pass through the sliding holes (104) to realize the lifting platform (102) moving along the arrangement direction of the guide posts (103). The top surface of the lifting platform (102) abuts against the bottom end of the upper steel lattice column (2). The end of the guide post (103) away from the base (101) is used to be arranged inside the limit guide hole (201) of the upper steel lattice column (2).

4. The elevation control device for the top of the foundation pit column according to claim 3, wherein: The driving member includes a cylinder (105) and a fixing seat (106). The cylinder (105) is fixed to the top of the lower steel lattice column (3) through the fixing seat (106). A first telescopic rod is arranged on the cylinder (105). One end of the first telescopic rod is connected to the cylinder (105), and the other end of the first telescopic rod abuts against the bottom surface of the lifting platform (102). The cylinder (105) is electrically connected to the control component (5).

5. The elevation control device for the top of the foundation pit column according to claim 3, characterized in that: A plurality of positioning holes (108) are formed in the guide post (103) along its arrangement direction. A locking component (109) is arranged on the lifting platform (102). The plurality of positioning holes (108) are selectively connected to the locking component (109) to realize the movement and fixation of the lifting platform (102) on the guide post (103).

6. The elevation control device for the top of the foundation pit column according to claim 5, characterized in that: The locking assembly (109) includes an installation groove (1092), a double-acting hydraulic cylinder (1093), and a movable hole (1091). The installation groove (1092) is formed in the top surface of the lifting platform (102). The end orientation of the installation groove (1092) is the same as the opening direction of the positioning hole (108). Both ends of the installation groove (1092) are provided with movable holes (1091). One end of the movable hole (1091) communicates with the installation groove (1092), and the other end of the movable hole (1091) communicates with the positioning hole (108). The double-acting hydraulic cylinder (1093) is fixedly arranged inside the installation groove (1092), and the second telescopic rods at both ends of the double-acting hydraulic cylinder (1093) are movably arranged inside the movable hole (1091) to achieve the clamping and separation of the second telescopic rods from the positioning hole (108). The double-acting hydraulic cylinder (1093) is electrically connected to the control assembly (5).

7. The elevation control device for the top of the foundation pit column according to claim 3, wherein: A pressure sensor (1010) is arranged on the top surface of the lifting platform (102), and the pressure sensor (1010) is electrically connected to the numerical control terminal (7) to monitor the pressure of the upper steel lattice column (2) on the lifting platform (102).

8. The elevation control device for the top of the foundation pit column according to claim 1, characterized in that: The monitoring assembly (6) includes a GPS elevation measuring instrument (602), a tensile stress sensor (603), and a signal collector (601). The GPS elevation measuring instrument (602) and the tensile stress sensor (603) are both used to be arranged on the top surface of the uppermost support beam (9) and directly above the center line of the upper steel lattice column (2). The GPS elevation measuring instrument (602) is wirelessly signal-connected to the numerical control terminal (7). The tensile stress sensor (603) is electrically connected to the signal collector (601), and the signal collector (601) is electrically connected to the numerical control terminal (7).

9. The elevation control device for the top of the foundation pit column according to claim 8, wherein: The monitoring assembly (6) further includes a GPS calibration device (8) to improve the elevation measurement accuracy of the GPS elevation measuring instrument (602).

10. A method for controlling the elevation of the top of a foundation pit column, characterized in that, It includes the following steps: Provide the foundation pit column top elevation control device as described in any one of claims 1-9; Set a preset elevation A and a tensile stress alarm value C; Collect the elevation data B of the upper steel lattice column (2) at each measuring point and the tensile stress D on the top surface of the uppermost support beam (9); Judge whether the absolute value of the difference between B and A exceeds the threshold; If the absolute value of the difference between B and A exceeds the threshold, when the difference between B and A is positive, use the height adjustment assembly (1) to lower the upper steel lattice column (2) until the lowered elevation value is equal to the difference, and the height adjustment assembly (1) stops working; when the difference between B and A is negative, use the height adjustment assembly (1) to raise the upper steel lattice column (2) until the raised elevation value is equal to the difference, and the height adjustment assembly (1) stops working; otherwise, the height adjustment assembly (1) always stops working; Judge whether D exceeds C; If D exceeds C, the alarm is turned on, manual review is carried out, and the elevation of the upper steel lattice column (2) is adjusted through the height adjustment assembly (1) until the alarm is turned off, and then judge again whether the absolute value of the difference between B and A exceeds the threshold; otherwise, directly judge again whether the absolute value of the difference between B and A exceeds the threshold; Repeat the above steps until the foundation pit construction is completed.

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