A high pier large span cap beam attachment bracket device and construction method thereof

Abstract

The present invention relates to a high-pier large-span cap beam attached support device and a construction method thereof, belonging to the technical field of bridge construction, comprising two support bodies, the two support bodies are respectively arranged in the space between two adjacent columns of the three columns of the three-column portal pier, the support body comprises four measuring devices, the four measuring devices are respectively arranged at the two ends of the two support bodies; it also comprises an auxiliary measuring device, the auxiliary measuring device is electrically connected to a control module, the four measuring devices are used to send signals to the auxiliary measuring devices, the auxiliary measuring device is used to receive signals sent by the four measuring devices, the auxiliary measuring device is used to judge whether the four measuring devices and itself are in a plane, and send the judgment result to the control module; it has high horizontality and good cap beam supporting effect.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a high-pier large-span cap beam attachment type bracket device and a construction method thereof. Background Art

[0002] In the construction of some bridges, cap beam construction is a necessary step. The cap beam is set on the top of two piers to strengthen the overall structural strength of several vertically arranged piers. The general method of the cap beam construction process is to build parallel longitudinal supports next to the columns after the construction of the bridge piers is completed, and the cap beam is erected on the top of the longitudinal supports to complete the support for the cap beam construction.

[0003] However, in the process of using the above construction method for construction, since it is necessary to build a columnar support of the same height as the column, the workload is large and the safety is low. For this reason, Chinese patent CN105648911B discloses a concrete attached prestressed truss support for cast-in-place beams, cap beams and tie beams for bridge construction, including two concrete piers; also including two upper embedded components, two lower embedded components, two tripod components, a lower chord component and a longitudinal connecting component; one end of the two upper embedded components is respectively embedded in the upper part of the two concrete piers, one end of the two lower embedded components is respectively embedded in the lower part of the two concrete piers, the other ends of the two upper embedded components are respectively connected to the two tripod components, the other ends of the two lower embedded components are respectively connected to the two tripod components, both ends of a lower chord component are connected to the two tripod components, and both ends of a longitudinal connecting component are connected to the two tripod components. Parts are connected; it shortens the construction period by adopting the process of ground assembly, bolt connection, and overall lifting, and is easy to operate, has low safety risks and short time consumption; however, in some cases, the shape of the bridge pier will change. For example, during the construction process, when the target position of the bridge pier crosses underground oil and gas pipeline facilities, the bridge pier needs to be changed from a split hollow pier to a three-column gantry pier to avoid the oil and gas pipeline. At this time, the cap beam needs to be set on the three columns of the three-column gantry pier, the span is increased, and the embedded bracket needs to be set between the three columns at the same time. In the above structure, it is mainly used for structures with two columns such as split hollow piers. Compared with the case of being set on two columns, when it is set on three or more columns, higher requirements are put forward for the horizontality of the embedded bracket. For this reason, a high-pier and large-span cap beam attached bracket device with high horizontality and good cap beam support effect is required, as well as a construction method thereof. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a high-pier and large-span cap beam attached bracket device and a construction method thereof, which has the characteristics of high horizontality and good cap beam supporting effect.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A high pier large span cap beam attachment bracket device comprises two bracket bodies, the two bracket bodies are respectively arranged in the space between two adjacent columns of three columns of a three-column portal pier, the bracket body comprises four measuring devices, the four measuring devices are respectively arranged at both ends of the two bracket bodies;

[0007] It also includes an auxiliary measuring device, which is electrically connected to the control module. The four measuring devices are used to send signals to the auxiliary measuring device, and the auxiliary measuring device is used to receive the signals sent by the four measuring devices. The auxiliary measuring device is used to determine whether the four measuring devices are in the same plane as itself, and send the determination result to the control module.

[0008] As a preferred technical solution of the present invention, it also includes several external measuring devices electrically connected to the control module, several of the external measuring devices are set on the remaining piers, and the several external measuring devices are used to measure the height difference between themselves and the auxiliary measuring devices, and upload it to the control module. The control module determines whether the height difference between the external measuring device and the measuring device is greater than a threshold, and issues an alarm when the judgment result is yes.

[0009] As a preferred technical solution of the present invention, it also includes a temperature sensor electrically connected to the control module, wherein the temperature sensor is used to measure the ambient temperature near the three-column portal pier and upload it to the control module, wherein the control module increases the threshold when the temperature data exceeds a reference value, and lowers the threshold when the temperature data is lower than a reference value.

[0010] As a preferred technical solution of the present invention, any one of the bracket bodies includes an arch bracket, and the two arch brackets are respectively arranged in the space between two adjacent columns of the three columns of the three-column portal pier, and the arch bracket is lowered to form an arch portion, and a stress rod is arranged at the bottom end of the arch portion, and the stress rod is used to apply opposite pulling forces to both sides of the bottom end of the arch portion.

[0011] As a preferred technical solution of the present invention, the three-column portal pier includes columns numbered a, b and c, the columns numbered a, b and c are arranged in sequence, the distance between the column a and the column b is e1, the distance between the column b and the column c is e2, the stress of the stress rod of the arch support arranged between the column a and the column b is F1, and the stress of the stress rod of the arch support arranged between the column b and the column c is F2;

[0012] Among them, F1=e2 / (e1+e2)×F0, F2=e1 / (e1+e2)×F0, and F0 is a pre-calculated reference constant.

[0013] As a preferred technical solution of the present invention, it also includes a center column inclination measuring device, which is used to measure the inclination angle d of the b column toward the a column, the stress of the stress rod of the arch support arranged between the a column and the b column is F1×A1, and the stress of the stress rod of the arch support arranged between the b column and the c column is F2×A2;

[0014] Among them, A1=1+(90-d) / 90, A2=1-(90-d) / 90.

[0015] The present invention also provides a construction method of a high pier large span cap beam attachment bracket device, comprising the following steps:

[0016] Step 1: Set up the steel structure of several columns of the three-column portal pier, and set up several bracket bodies at predetermined positions;

[0017] Step 2: The measuring device is used to measure the height difference with the other two measuring devices and upload the height difference data to the control module. The control module determines whether the height difference is greater than a threshold value. When the judgment result is yes, an alarm is issued, and the operator adjusts the height of the bracket body until the judgment result is no;

[0018] Step 3: Cast several columns and fix several bracket bodies on the columns.

[0019] The beneficial effects of the present invention are:

[0020] (1) By setting up four measuring instruments and one auxiliary measuring instrument to detect the horizontality and height consistency of the two bracket bodies, the measurement accuracy of the three-column portal pier cap beam construction is improved;

[0021] (2) By setting a temperature sensor and then adjusting the threshold through the temperature sensor, when the temperature is high and the probability of false alarm caused by thermal expansion and contraction is higher, the alarm sensitivity is reduced, thereby reducing the probability of false alarm; when the temperature is low and the probability of false alarm caused by thermal expansion and contraction is lower, the alarm sensitivity is increased, thereby improving the measurement accuracy;

[0022] (3) By setting stress rods in the arched part of the support body, the stress is increased when the span is large and reduced when the span is small, thus adjusting the stress according to the span size and improving the support level;

[0023] (4) By setting up a middle column inclination measuring device to measure the inclination angle d of column b toward column a, the matching degree between the stress of the stress rod of the bracket body and the actual situation is improved, the stability of the bracket body and the column is improved, and the supporting effect of the cap beam is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the cap beam of the present invention when it is not installed;

[0027] Figure 3 This is a schematic diagram of the structure of one of the bracket bodies.

[0028] Description of main component symbols:

[0029] In the figure: 1, cap beam; 2, column; 21, column a; 22, column b; 23, column c; 3, bracket body; 31, measuring device; 32, arch bracket; 33, stress rod. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0031] See also Figure 1-3 , an attached bracket device for a high pier and a large span cap beam 1 and a construction method thereof, comprising a bracket body 3, wherein the bracket body 3 is arranged on a three-column portal pier;

[0032] Specifically, the three-column gantry pier comprises at least three columns 2, and a cap beam 1 connecting the three columns 2, and the axis lines of the three columns 2 are in the same plane;

[0033] After the columns 2 are set, it is necessary to set up the cap beam 1 so that the cap beam 1 is connected to the three columns 2. At this time, it is necessary to first set up the steel frame structure of the cap beam 1, and then pour concrete on the basis of the steel frame structure. In order to maintain the steel frame structure on the top of the three columns 2, it is necessary to set up a bracket. In this embodiment, each bracket body 3 includes an arch bracket 32, and three parallel columns 2 form two inter-column spaces. Two arch brackets 32 are respectively arranged in the two inter-column spaces, so that each arch bracket 32 ​​spans two brackets, and each bracket is arranged on the top of the corresponding two columns 2;

[0034] Each arch support 32 includes two attachment parts and a spanning part arranged between the attachment parts. Before each column 2 is cast, the two attachment parts of the arch support 32 are firstly arranged in the column 2. The arrangement position of the attachment parts ensures that after the column 2 is cast, the part where the attachment parts are connected with the spanning part is extended out. After the column 2 is cast, the spanning part is arranged between the two attachment parts. At this time, each arch support 32 constitutes an arch support 32 spanning two adjacent columns 2, and the two arch supports 32 constitute a support platform for supporting the steel structure of the cap beam 1.

[0035] When in use, during the construction of the cap beam 1, the steel structure of the cap beam 1 is placed on top of the two arched brackets 32. The two arched brackets 32 keep the steel structure in its original position, which is convenient for the subsequent pouring process of the cap beam 1.

[0036] In the above process, since the steel structure of the cap beam 1 needs to be set on two arch supports 32, when the arch supports 32 are not level with the ground, the steel structure of the cap beam 1 thereon will not be level with the ground, which will cause the cap beam 1 to deflect. In order to ensure the horizontality of the embedded support, the support body 3 includes four measuring devices 31;

[0037] It also includes an auxiliary measuring device 31, which is electrically connected to the control module. The four measuring devices 31 are used to send signals to the auxiliary measuring device 31, and the auxiliary measuring device 31 is used to receive signals sent by the four measuring devices 31. The auxiliary measurement is used to determine whether the four measuring devices 31 are in the same plane as itself, and send the determination result to the control module.

[0038] Specifically, a surface perpendicular to the ground and including the intersection of the axes of the three columns 2 is a reference surface. Each measuring device 31 includes a laser transmitter extending perpendicular to the reference surface. The emission direction of the laser transmitter is parallel to the upper part of the bracket body 3. At the same time, for the four measuring devices 31, the distances of the extension perpendicular to the reference surface are different. The extension distances of the four measuring devices 31 are 15 cm, 20 cm, 25 cm and 30 cm respectively. At this time, the emission directions of the laser transmitters of the four measuring devices 31 are consistent with the directions of their respective bracket bodies 3, and the four laser transmitters can simultaneously emit lasers in the direction parallel to the reference surface without being blocked. The auxiliary measuring device 31 includes a receiver. The auxiliary measuring device 31 is used to capture the laser emitted by the laser transmitter and determine its emission direction. The height of the auxiliary measuring device 31 is consistent with the height of the measuring device 31 when the bracket body 3 is in the theoretical position. The four measuring devices 31 are configured to emit lasers to the left side of the three-column gantry pier. The auxiliary measuring device 31 is configured to emit lasers to the left side of the three-column gantry pier.

[0039] When the arch support 32 is set, four corresponding measuring devices 31 are set at the same time, and an auxiliary measuring device 31 is set at the same time. The four measuring devices 31 emit lasers. When the support body 3 tilts, the laser of at least one measuring device 31 is driven to emit in a direction deviating from the theoretical direction. At this time, the auxiliary measuring device 31 cannot detect the laser of this measuring device 31, and then judge whether the laser is emitted from the theoretical direction;

[0040] At the same time, when there are two bracket bodies 3 that are both tilted but at different heights, the auxiliary measuring device 31 determines whether the four measuring devices 31 of the two bracket bodies 3 are at the same height by judging the laser injection point. If the judgment result is no, the auxiliary measuring device 31 sends a signal to the control module, and the control module sends an alarm at this time;

[0041] Compared with the general hollow pier with two columns 2, in this solution, it is possible to determine whether the two brackets are at the same height by determining the laser entry point of the measuring device 31, thereby preventing the situation where the two brackets are not at the same height but the measuring device 31 fails to detect it, further improving the measurement accuracy;

[0042] By setting four measuring devices 31 and one auxiliary measuring device 31 to detect the horizontality and height consistency of the two bracket bodies 3, the measurement accuracy of the construction of the three-column portal pier cap beam 1 is improved.

[0043] Since in this scenario, the three-column gantry pier is temporarily modified from the partitioned hollow pier, the bridge includes several partitioned hollow piers as other piers in addition to the above three-gate piers. In order to further improve the measurement accuracy and prevent the cap beam 1 from being unable to remain in the same horizontal plane with the cap beams 1 of the other piers, it also includes several external measuring devices 31 electrically connected to the control module. Several of the external measuring devices 31 are arranged on the other piers. The several external measuring devices 31 are used to measure the height difference between themselves and the auxiliary measuring devices 31, and upload it to the control module. The control module determines the external measuring devices 31. Whether the height difference with the measuring device 31 is greater than the threshold value, when the judgment result is yes, an alarm is issued and the external measuring device 31 is communicated with the control module. When in use, the control module judges the height difference between the auxiliary measuring device 31 and the external measuring device 31, and judges the height difference between the four measuring devices 31 and the auxiliary measuring device 31, judges whether the four measuring devices 31 and the external measuring device 31 are in the same plane, and then judges whether the bracket body 3 and the remaining piers are in the same plane. At this time, the external measuring device 31 serves as a reference for the control module to judge the horizontality and height consistency of the three measuring devices 31.

[0044] In the above process, in the cast column 2 where the four measuring devices 31 are located, when the temperature changes more drastically, there is a probability that the bracket body 3 is correctly set, but the column 2 where the four measuring devices 31 are located undergoes thermal expansion and contraction. At this time, there is a probability that the heights of the four measuring devices 31 are inconsistent, causing the control module to issue a false alarm. At this time, it is necessary to appropriately reduce the alarm sensitivity, that is, to increase the threshold. For this purpose, a temperature sensor electrically connected to the control module is also included. The temperature sensor is used to measure the ambient temperature near the three-column gantry pier and upload it to the control module. The control module increases the threshold when the temperature data exceeds the reference value, and reduces the threshold when the temperature data is lower than the reference value.

[0045] Specifically, when the temperature data exceeds the reference value, it means that the column 2 has a greater probability of thermal expansion and contraction to a greater extent. At this time, the threshold value needs to be increased so that the height difference is less likely to exceed the threshold value to trigger an alarm, thereby causing a false alarm. At this time, the control module increases the threshold value; similarly, when the temperature data is lower than the reference value, it means that the column 2 has a lower probability of thermal expansion and contraction to a greater extent. At this time, the threshold value needs to be lowered so as to increase the sensitivity of the height difference alarm. At this time, the control module lowers the threshold value;

[0046] By setting a temperature sensor and then adjusting the threshold through the temperature sensor, when the temperature is high and the probability of false alarm caused by thermal expansion and contraction is higher, the alarm sensitivity is reduced, thereby reducing the probability of false alarm; when the temperature is low and the probability of false alarm caused by thermal expansion and contraction is lower, the alarm sensitivity is increased, thereby improving the measurement accuracy.

[0047] For each bracket body 3, an arch portion is formed below any arch bracket 32, and a stress rod 33 is provided at the bottom end of the arch portion. The stress rod 33 is used to apply opposite pulling forces to both sides of the bottom end of the arch portion;

[0048] Specifically, each bracket body 3 includes an arch after being set up, the upper part of the arch is a plane for supporting the metal frame, the arch itself forms a gap, and the stress rod 33 is used to connect the lower part of the bracket body 3 on both sides of the arch gap. At this time, the stress rod 33 makes the corresponding bracket body 3 slightly arched. When the metal frame of the cap beam 1 is placed above the bracket body 3, the bulge of the bracket body 3 is offset by the gravity of the metal frame, and the stress rod 33 improves the supporting capacity of the bracket body 3.

[0049] In the above process, when the three-column gantry pier needs to avoid the underground oil and gas pipeline, the three columns 2 of the three-column gantry pier have different spacings, and the bracket spans set between two columns 2 with different spacings are different. The bracket bodies 3 with different spans are subjected to different forces when bearing the metal frame of the cap beam 1. When the span is large and the moment of force on the middle part of the bracket body 3 is large, it is necessary to increase the stress of the stress rod 33 on the bracket body 3 accordingly. When the moment of force is small, it is necessary to reduce the stress of the stress rod 33 on the bracket body 3 accordingly.

[0050] To this end, specifically, a three-column gantry pier is provided including columns 2 numbered a, b and c, the columns 2 numbered a, b and c are arranged in sequence, the distance between the a column 21 and the b column 22 is e1, the distance between the column 2b and the c column 23 is e2, the stress of the stress rod 33 of the arch bracket 32 ​​arranged between the a column 21 and the b column 22 is F1, and the stress of the stress rod 33 of the arch bracket 32 ​​arranged between the b column 22 and the c column 23 is F2;

[0051] Among them, F1=e2 / (e1+e2)×F0, F2=e1 / (e1+e2)×F0, F0 is a pre-calculated reference constant;

[0052] When b is greater than a, it means that the span e2 of the arch support 32 between the b column 22 and the c column 23 is larger, and the value of F1=e2 / (e1+e2)×F0 is larger at this time, so when the span is larger, the stress on the corresponding support body 3 is increased;

[0053] By arranging the stress rod 33 at the arched part of the support body 3, the stress is increased when the span is large and the stress is reduced when the span is small, thereby adjusting the stress according to the span size and improving the support level.

[0054] During the above construction process, there is a probability that the central column 2 will deviate. When the central column 2 deviates toward other columns 2, there is a probability that the space between the columns 2 will deviate from the theoretical value. At this time, it is necessary to further adjust the stress of the bracket body 3. For example, when the central column 2 numbered b deviates toward the a column 21, the b column 22 squeezes the space between the a column 21 and the b column 22. At this time, the b column 22 and the a column 21 replace the stress rod 33 to play a role in partially compressing the two ends of the bracket body 3. At this time, it is necessary to correspondingly reduce the stress of the stress rod 33 of the arch bracket 32 ​​between the a column 21 and the b column 22. At the same time, due to the increase in the distance between the b column 22 and the c column 23, it is necessary to appropriately increase the tension of the stress rod 33 of the bracket body 3 between the b column 22 and the c column 23 on the arch bracket 32. By tightening the two ends of the arch bracket 32, the b column is tightened in the direction away from the a column 21 to ensure that the b column 22 will not continue to deviate toward the a column 21.

[0055] In order to achieve the above stress adjustment, a center column inclination measuring device 31 is further included. The center column inclination measuring device 31 is used to measure the inclination angle d of the b column 22 toward the a column 21. The stress of the stress rod 33 of the arch bracket 32 ​​arranged between the a column 21 and the b column 22 is F1×A1, and the stress of the stress rod 33 of the arch bracket 32 ​​arranged between the b column 22 and the c column 23 is F2×A2.

[0056] Among them, A1=1+(90-d) / 90, A2=1-(90-d) / 90;

[0057] When the value of d is large, exceeding 90, it means that the a column 21 is deflected toward the b column 22. At this time, it is necessary to reduce the stress of the stress rod 33 of the arch bracket 32 ​​between the a column 21 and the b column 22, and increase the stress of the stress rod 33 of the arch bracket 32 ​​between the b column 22 and the c column 23. At this time, the value of A1=1+(90-d) / 90 is less than 1, and the value of A2=1-(90-d) / 90 is greater than 1. When the stress of the stress rod 33 of the arch bracket 32 ​​set between the a column 21 and the b column 22 is F1×A1, the stress reduction is completed, and when the stress of the stress rod 33 of the arch bracket 32 ​​set between the b column 22 and the c column 23 is F2×A2, the stress increase is completed.

[0058] Similarly, when the value of d is small, less than 90, it means that the a column 21 is deflected toward the c column 23. At this time, it is necessary to increase the stress of the stress rod 33 of the arch bracket 32 ​​between the a column 21 and the b column 22 accordingly, and reduce the stress of the stress rod 33 of the arch bracket 32 ​​between the b column 22 and the c column 23. At this time, the value of A1=1+(90-d) / 90 is greater than 1, and the value of A2=1-(90-d) / 90 is less than 1. When the stress of the stress rod 33 of the arch bracket 32 ​​arranged between the a column 21 and the b column 22 is F1×A1, the stress is increased, and when the stress of the stress rod 33 of the arch bracket 32 ​​arranged between the b column 22 and the c column 23 is F2×A2, the stress is reduced.

[0059] By setting a center column inclination measuring device 31 to measure the inclination angle d of the b column 22 toward the a column 21, the matching degree between the stress of the stress rod 33 of the bracket body 3 and the actual situation is improved, the stability of the bracket body 3 and the column 2 is improved, and the supporting effect of the cap beam 1 is further improved.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high pier and large span cap beam attachment bracket device, characterized in that: It comprises two bracket bodies, the two bracket bodies are respectively arranged in the space between two adjacent columns of the three columns of the three-column portal frame pier, and the bracket body comprises four measuring devices, the four measuring devices are respectively arranged at the two ends of the two bracket bodies; It also includes an auxiliary measuring device, the auxiliary measuring device is electrically connected to the control module, the four measuring devices are used to send signals to the auxiliary measuring device, the auxiliary measuring device is used to receive the signals sent by the four measuring devices, the auxiliary measuring device is used to determine whether the four measuring devices and itself are in a plane, and send the determination result to the control module; Any of the bracket bodies comprises an arch bracket, and the two arch brackets are respectively arranged in the space between two adjacent columns of the three columns of the three-column portal frame pier, and the arch bracket is lowered to form an arch portion, and a stress rod is arranged at the bottom end of the arch portion, and the stress rod is used to apply opposite pulling forces to both sides of the bottom end of the arch portion; The three-column gantry pier includes columns numbered a, b and c, the columns numbered a, b and c are arranged in sequence, the distance between the column a and the column b is e1, the distance between the column b and the column c is e2, the stress of the stress rod of the arch support arranged between the column a and the column b is F1, and the stress of the stress rod of the arch support arranged between the column b and the column c is F2; Among them, F1=e2 / (e1+e2)×F0, F2=e1 / (e1+e2)×F0, F0 is a pre-calculated reference constant; It also includes a center column inclination measuring device, which is used to measure the inclination angle d of the b column toward the a column, the stress of the stress rod of the arch support arranged between the a column and the b column is F1×A1, and the stress of the stress rod of the arch support arranged between the b column and the c column is F2×A2; Among them, A1=1+(90-d) / 90, A2=1-(90-d) / 90.

2. The high pier large span cap beam attachment bracket device according to claim 1, characterized in that: It also includes several external measuring devices electrically connected to the control module. Several of the external measuring devices are set on the remaining bridge piers. The several external measuring devices are used to measure the height difference between themselves and the auxiliary measuring devices, and upload the height difference to the control module. The control module determines whether the height difference between the external measuring device and the measuring device is greater than a threshold value, and issues an alarm when the judgment result is yes.

3. The high pier large span cap beam attachment bracket device according to claim 2 is characterized in that: It also includes a temperature sensor electrically connected to the control module, which is used to measure the ambient temperature near the three-column portal pier and upload it to the control module. The control module increases the threshold when the temperature data exceeds the reference value, and reduces the threshold when the temperature data is lower than the reference value.

4. A construction method of a high pier large-span cap beam attachment bracket device, applicable to a high pier large-span cap beam attachment bracket device according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Set up the steel structure of several columns of the three-column portal pier, and set up several bracket bodies at predetermined positions; Step 2: The measuring device is used to measure the height difference with the other two measuring devices and upload the height difference data to the control module. The control module determines whether the height difference is greater than a threshold value. When the judgment result is yes, an alarm is issued, and the operator adjusts the height of the bracket body until the judgment result is no; Step 3: Cast several columns and fix several bracket bodies on the columns.

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