String net rack lifting construction process adopting optical fiber smart cable

Abstract

The invention discloses a string net rack lifting construction process adopting an optical fiber smart cable, which comprises the following steps: S1, checking calculation: firstly, carrying out whole-process construction simulation checking calculation on a net rack lifting process according to the structural form characteristics of a lifting net rack and the arrangement condition of a prestressed inhaul cable; s2, according to the construction simulation checking calculation result in the step S1, a net rack is assembled, and an optical fiber intelligent cable and a corresponding tensioning tool are installed in the net rack; and S3, pre-tensioning is conducted, specifically, according to the construction simulation checking calculation result in the step S1, a tensioning tool arranged in the partition net rack is adjusted, and the net rack has a certain pre-tensioning force before being lifted. According to the method, the deformation condition of the net rack is optimized by adjusting the tensioning classification and the tensioning insertion time of the inhaul cables, the stress ratio over-limit number of components is reduced, the rod piece replacement cost and the construction period investment are reduced, and in the actual lifting process, the stress changes of all positions of the net rack can be monitored, and the construction risk can be predicted in advance.

Description

Technical Field

[0001] The present invention relates to the technical field of grid construction, and in particular to a construction process for lifting a grid using optical fiber smart cables. Background Art

[0002] In recent years, with the continuous innovation of construction technology, traditional architectural design has paid more and more attention to structural modeling and architectural appearance effects while meeting functionality. Especially for projects such as airports and station buildings, the roof structure is also relatively complex, with many characteristics such as large span, high clearance, irregular space, complex modeling, and tight construction period. Conventional construction methods have low efficiency and high construction difficulty. As a self-balancing force system, the string structure can enhance the overall rigidity of the structure by applying prestress in advance, and unload in advance with the help of the prestressed structure, which is conducive to the interlaced construction of various disciplines and shortens the construction period.

[0003] In the prior art, there are many deformation and internal force redistribution steps in the lifting and unloading construction stages of the grid, and the stress state of the grid in the lifting stage is inconsistent with the design state. Because the lifting points in the lifting state are often less than the design support points, and the stress is relatively concentrated, the internal force of some rods exceeds the design value. In order to ensure that the on-site construction is highly fitted with the construction stress conditions at each stage in the construction simulation verification without changing the design structure, reduce the structural construction deformation, and ensure the safety and reliability of the lifting construction, a tensioned grid lifting construction process using optical fiber smart cables is proposed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned deficiencies and to provide a construction process for lifting a tensioned grid using optical fiber smart cables, thereby improving the safety and reliability of grid construction and reducing costs and construction risks.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a construction process for lifting a string-type grid frame using optical fiber smart cables, the string-type grid frame lifting construction process comprising the following steps:

[0006] S1. Verification: First, according to the structural characteristics of the lifting grid and the arrangement of the prestressed cables, the whole process of grid lifting is simulated and verified:

[0007] S2, assembling, according to the construction simulation verification results in step S1, assembling the grid, and installing the optical fiber smart cable and the corresponding tensioning tooling in the grid;

[0008] S3, pre-tensioning, according to the construction simulation verification results in step S1, the tensioning tooling set in the adjustment partition grid is set to make the grid have a certain pre-tensioning force before lifting;

[0009] S4, lifting, lift the grid to the designed elevation, measure the deformation of both ends of the closing section rods by 3D scanning equipment, and then after the installation of the supplementary rods is completed, remove the optical fiber smart cable and tensioning tooling, and the construction is completed.

[0010] Furthermore, in the step S2 of assembling the grid, the grid assembly includes the following steps:

[0011] S201, clearing the site below the grid installation point and setting up a support frame in the site;

[0012] S202, assembling and welding the partition grid according to the deformation and arching requirements;

[0013] S203, installing lifting equipment at the grid installation point.

[0014] Furthermore, the optical fiber smart cable includes a steel cable, and the steel cable is used to be set in the grid through a tensioning tool according to the construction simulation verification result in step S1.

[0015] Furthermore, a CFRP sensing rib is provided at the axis of the steel cable, and a monitoring optical fiber is provided inside the CFRP sensing rib;

[0016] The optical fiber smart cable also includes a monitoring device, which is connected to the monitoring optical fiber signal to detect changes in the actual value of the steel cable tension.

[0017] Furthermore, the monitoring device is a fiber grating regulator.

[0018] Furthermore, in step S3, after the optical fiber smart cable is tensioned, a monitoring device is used to detect the actual value of the tension applied to the optical fiber smart cable, and timely adjustments are made based on the difference between the actual value and the theoretical calculation.

[0019] Furthermore, the lifting equipment is a hydraulic lifting device, the lifting equipment is in multiple groups, and the lifting points are distributed on the grid according to the construction simulation verification result in step S1.

[0020] Furthermore, in step S4, before the grid is lifted to the designed elevation, the grid is first lifted off the ground by a lifting device and kept still for five minutes, and the tension change of the optical fiber smart cable in the off-the-ground state is monitored by a monitoring device, and compared and adjusted with the theoretical calculated difference.

[0021] The beneficial effects of the present invention are embodied in:

[0022] The present invention adds cables that can provide prestress, that is, optical fiber smart cables, during the calculation process of the grid lifting construction. By adjusting the cable tensioning classification and tensioning insertion time, the deformation of the grid is optimized and the number of component stress ratio exceeding the limit is reduced, thereby reducing the cost of replacing rods and the investment in construction period. In addition, during the actual lifting process, the stress changes at various parts of the grid can be monitored, the construction risks can be predicted in advance, and whether the grid has stress damage during the construction process can be monitored to improve the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a process flow chart of the present invention;

[0024] Figure 2 This is a verification model diagram of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-2 The present invention discloses a construction process for lifting a string-type grid frame using an optical fiber smart cable, and the construction process for lifting a string-type grid frame includes the following steps:

[0027] S1. Verification: First, according to the structural characteristics of the lifting grid and the arrangement of the prestressed cables, the whole process of grid lifting is simulated and verified:

[0028] S2, assembling, according to the construction simulation verification results in step S1, assembling the grid, and installing the optical fiber smart cable and the corresponding tensioning tooling in the grid;

[0029] S3, pre-tensioning, according to the construction simulation verification results in step S1, the tensioning tooling set in the adjustment partition grid is set to make the grid have a certain pre-tensioning force before lifting;

[0030] S4, lifting, lift the grid to the designed elevation, measure the deformation of both ends of the closing section rods by 3D scanning equipment, and then after the installation of the supplementary rods is completed, remove the optical fiber smart cable and tensioning tooling, and the construction is completed.

[0031] The above construction process is mainly to avoid that after the grid is assembled, it is affected by gravity on the ground, it is affected by the tension and gravity of the lifting point during lifting, and it is affected by the supporting force of the supporting point after installation, resulting in different stress distribution inside the grid. In order to ensure normal installation, rods need to be set in the grid before the construction is completed, and these rods need to be removed after the installation is completed, resulting in high construction costs and complicated processes.

[0032] Compared with the traditional lifting construction process, the construction process disclosed in the present application adds cables that can provide prestress, that is, optical fiber smart cables, during the calculation process of the grid lifting construction. By adjusting the cable tensioning classification and tensioning insertion time, the deformation of the grid is optimized and the number of component stress ratio exceeding the limit is reduced, thereby reducing the cost of replacing rods and the construction period investment. In addition, during the actual lifting process, the stress changes at various parts of the grid can be monitored to predict construction risks in advance. It can also be monitored whether the grid has hidden stress damage during the construction process to improve the construction quality.

[0033] It should be noted that, in the step S2 of assembling the grid, the grid assembly includes the following steps:

[0034] S201, clearing the site below the grid installation point and setting up a support frame in the site;

[0035] S202, assembling and welding the partition grid according to the deformation and arching requirements;

[0036] S203, installing lifting equipment at the grid installation point.

[0037] In the above steps, the grid structure can be assembled in strips and units on the supporting frame to better and more reliably obtain the corresponding grid to meet the construction requirements.

[0038] It should be noted that the optical fiber smart cable includes a steel cable, which is arranged in the grid through a tensioning tool according to the construction simulation verification result in step S1. Figure 2 As shown, the corresponding force model can be calculated according to different implementation situations, and the optical fiber smart cable can be set according to the feedback data.

[0039] It is easy to imagine that a CFRP sensing rib (composite sensing rib) is arranged at the axis of the steel cable, and a monitoring optical fiber is arranged inside the CFRP sensing rib;

[0040] The optical fiber smart cable also includes a monitoring device, which is connected to the monitoring optical fiber signal to detect changes in the actual value of the steel cable tension.

[0041] The above-mentioned structural setting makes it possible to obtain actual values ​​during the installation and lifting process through monitoring equipment, so as to facilitate flexible adjustments at the construction site.

[0042] It should be noted that the monitoring device is a fiber grating regulator.

[0043] In step S3 described in the present application, after the optical fiber smart cable is tensioned, the monitoring equipment is used to detect the actual value of the tension on the optical fiber smart cable, and timely adjust it according to the difference between the actual value and the theoretical calculation value, such as Figure 1 As shown, when it is detected that the actual value of the tension applied to the optical fiber smart cable is different from the theoretical calculated value, the tension applied to the optical fiber smart cable can be adjusted through the tensioning tooling to meet the model standard.

[0044] It should be added that the lifting equipment is a hydraulic lifting device, the lifting equipment is in multiple groups, and its lifting points are distributed on the grid according to the construction simulation verification results in step S1.

[0045] Finally, in step S4, before the grid is lifted to the designed elevation, the grid is first lifted off the ground by a lifting device, the height from the ground can be 30-80 cm, and it is kept still for five minutes. The tension change of the optical fiber smart cable in the off-the-ground state is monitored by a monitoring device, and compared and adjusted with the theoretical calculated difference.

[0046] In the above steps, when the grid is off the ground and stationary, the tension change of the fiber optic smart cable installed on the grid is significantly different from the theoretical value, and the difference exceeds the threshold range, the grid can be put back on the ground and the corresponding fiber optic smart cable can be adjusted to ensure that the tension it receives is balanced during the installation and lifting process to meet the safety construction standards.

[0047] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] In addition, "plurality" means two or more.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction process for lifting a string-type grid frame using optical fiber smart cables, characterized in that: The string grid lifting construction process includes the following steps: S1. Verification: First, according to the structural characteristics of the lifting grid and the arrangement of the prestressed cables, the whole process of grid lifting is simulated and verified: S2, assembling, according to the construction simulation verification results in step S1, assembling the grid, and installing the optical fiber smart cable and the corresponding tensioning tooling in the grid; S3, pre-tensioning, according to the construction simulation verification results in step S1, the tensioning tooling set in the adjustment partition grid is set to make the grid have a certain pre-tensioning force before lifting; S4, lifting, lift the grid to the designed elevation, measure the deformation of both ends of the closing section rods by 3D scanning equipment, and then after the installation of the supplementary rods is completed, remove the optical fiber smart cable and tensioning tooling, and the construction is completed.

2. According to claim 1, a construction process for lifting a string-type grid using optical fiber smart cables is characterized in that: In the step S2, the grid assembly includes the following steps: S201, clearing the site below the grid installation point and setting up a support frame in the site; S202, assembling and welding the partition grid according to the deformation and arching requirements; S203, installing lifting equipment at the grid installation point.

3. According to claim 1, a construction process for lifting a string grid using optical fiber smart cables is characterized in that: The optical fiber smart cable includes a steel cable, and the steel cable is used to be set in the grid through a tensioning tool according to the construction simulation verification result in step S1.

4. According to claim 3, a construction process for lifting a string-type grid frame using optical fiber smart cables is characterized in that: A CFRP sensing rib is arranged at the axis of the steel cable, and a monitoring optical fiber is arranged inside the CFRP sensing rib; The optical fiber smart cable also includes a monitoring device, which is connected to the monitoring optical fiber signal to detect changes in the actual value of the steel cable tension.

5. According to claim 4, a construction process for lifting a string-type grid frame using optical fiber smart cables is characterized in that: The monitoring device is a fiber grating regulator.

6. According to claim 5, a construction process for lifting a string-type grid frame using optical fiber smart cables is characterized in that: In step S3, after the optical fiber smart cable is tensioned, the monitoring equipment is used to detect the actual value of the tension applied to the optical fiber smart cable, and timely adjustments are made based on the difference between the actual value and the theoretical calculation value.

7. According to claim 2, a construction process for lifting a string-type grid using optical fiber smart cables is characterized in that: The lifting equipment is a hydraulic lifting device, and the number of the lifting equipment is multiple groups, and the lifting points are distributed on the grid according to the construction simulation verification results in step S1.

8. According to claim 6, a construction process for lifting a string-type grid frame using optical fiber smart cables, characterized in that: In step S4, before the grid is lifted to the designed elevation, the grid is first lifted off the ground by a lifting device and kept still for five minutes. The tension change of the optical fiber smart cable in the off-the-ground state is monitored by a monitoring device, and compared and adjusted with the theoretical calculated difference.

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