Intelligent control device and method for rapid and continuous beam falling of midspan steel beam

Abstract

The invention discloses an intelligent control device and method for rapid and continuous beam falling of a midspan steel beam, and relates to the technical field of engineering construction assistance. Comprising a rhombic truss and hydraulic lifting equipment, and the hydraulic lifting equipment is arranged on a front upper cross beam of the rhombic truss. The safety of a permanent structure in the bridge construction process and after the bridge is formed can be guaranteed, the construction speed is increased, and the method is more universal.

Description

Technical Field

[0001] The present invention relates to the field of engineering construction auxiliary technology, and in particular to an intelligent control device and method for rapid and continuous beam dropping of a mid-span steel beam. background

[0003] The span of domestic bridges is getting bigger and bigger. When the bridge type is a suspension bridge or a cable-stayed bridge, the superstructure is usually designed as a multi-span continuous steel truss beam, a box truss combined beam and other structural forms. During the cantilever assembly of the steel beam, it is necessary to ensure that the center line of the steel beam is consistent with the center line of the line, and to ensure that the relative relationship between the various sections of the steel beam is accurate, so that the steel beam can be erected and connected smoothly. In order to improve the measurement accuracy of the linear monitoring data of the steel beam and increase the comparability of the monitoring data of each section, the layout of the control points used for linear measurement is particularly important.

[0004] At present, the linear measurement control points in the process of cantilever assembly of steel beams in China mostly use the method of direct observation by setting up stations at shore control points. This method selects the control point near the main pier of the main bridge construction control network to set up the total station, and then looks back at other control points on the same bank or the control points on the opposite bank to directly observe the prism of the steel beam monitoring point. When the steel beam is erected to a certain length, the top surface of the lower chord and the top surface of the upper chord of the steel beam are relatively high, and the beam surface is wide. At this time, the monitoring point cannot be directly observed. It is necessary to transfer the station to the top surface of the lower chord or upper chord of the steel beam for observation. The disadvantages of this method are: ① Because the main piers of cable-stayed bridges or suspension bridges are usually far away from the shore, the measurement accuracy of this total station polar coordinate method is greatly affected by the external environment, and the measurement accuracy cannot be guaranteed; ② Although the main bridge control network has been re-measured regularly, the two main piers are observed respectively by using the control points on both sides of the bank, there are still the disadvantages of inconsistent measurement benchmarks and poor comparability of monitoring data.

[0005] Therefore, it is an urgent problem for technical personnel in this field to propose an intelligent control device and method for rapid and continuous beam dropping of mid-span steel beams to solve the problems of the inability to guarantee measurement accuracy and inconsistent measurement standards in the prior art. Summary of the invention

[0006] In view of this, the present invention provides an intelligent control device and method for rapid and continuous beam dropping of mid-span steel beams, which can achieve a high stability and balanced effect.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] The invention discloses an intelligent control device for rapidly and continuously dropping a mid-span steel beam, comprising a diamond truss and a hydraulic lifting device, wherein the hydraulic lifting device is arranged at the front upper cross beam of the diamond truss.

[0009] The above-mentioned device, optionally, the hydraulic lifting equipment includes a lifting jack, a hydraulic pump station and a lifting sling.

[0010] An intelligent control method for rapidly and continuously dropping a mid-span steel beam comprises the following steps:

[0011] S1. Set up signal nodes and sensors in the pier area to obtain pier main beam data;

[0012] S2, numbering the signal nodes and numbering the bridge pier areas according to the nodes;

[0013] S3, construct a simulation model based on the bridge pier and main beam data to obtain predicted monitoring data, and compare it with the actual data;

[0014] S4. If the comparison data does not exceed the threshold range, the crane is controlled to move and drop the beam. If it exceeds the threshold range, an alarm signal is issued.

[0015] In the above method, optionally, setting the pier area in S1 includes: constructing and installing a bracket according to the deadweight of the beam, setting bracket settlement observation sections at 1 / 4 span, 1 / 2 span, 3 / 4 span and front and rear supports along each span, and setting 3 observation points symmetrically along the transverse direction of each observation section as signal nodes.

[0016] The above method is optional, and the observation point measurement includes measuring the settlement height by using a hanging ruler method, pre-pressing by using a sand bag and a water tank to obtain the actual settlement value, and obtaining the support reaction force by using a lifting jack.

[0017] The above method can optionally construct a simulation model based on BIM technology to obtain theoretical settlement values ​​and theoretical support reaction forces.

[0018] It can be seen from the above technical solution that, compared with the prior art, the present invention provides an intelligent control device and method for rapid and continuous beam dropping of mid-span steel beams, which has the following beneficial effects: 1) first compare the theoretical monitoring data obtained by simulation with the actual test data to promptly discover whether large deviations occur during the construction process; 2) realize prompt warning or emergency processing to ensure the safety of the bridge construction process and the permanent structure after the bridge is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 This is a diagram of an intelligent control device for rapidly and continuously dropping a mid-span steel beam disclosed in the present invention;

[0021] Figure 2The present invention discloses a flow chart of an intelligent control method for rapidly and continuously dropping mid-span steel beams. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0024] Reference Figure 1 As shown, the present invention discloses an intelligent control device for rapidly and continuously dropping a mid-span steel beam, comprising a diamond truss and a hydraulic lifting device, wherein the hydraulic lifting device is arranged at the front upper cross beam of the diamond truss.

[0025] Furthermore, the hydraulic lifting equipment includes a lifting jack, a hydraulic pump station and a lifting sling.

[0026] Specifically, after the steel beam is pushed into place, each crane is connected into a whole by two diamond trusses through a transverse mechanism. LSD2000 hydraulic lifting equipment is set at the front upper crossbeam of each diamond truss, which consists of 4 LSD2000-300F lifting jacks, 2 LSDB35X2 hydraulic pump stations and 4 lifting slings. The lifting steel strand specification adopts 12-φj15.2mm steel strand with a tensile strength of 1860Mpa. The centralized control method is adopted, and the main console can control 4 lifting jacks and 2 hydraulic pump stations to perform beam dropping operations.

[0027] Reference Figure 2 As shown, the present invention discloses an intelligent control method for rapid and continuous beam dropping of a mid-span steel beam, comprising the following steps:

[0028] S1. Set up signal nodes and sensors in the pier area to obtain pier main beam data;

[0029] S2, numbering the signal nodes and numbering the bridge pier areas according to the nodes;

[0030] S3, construct a simulation model based on the bridge pier and main beam data to obtain predicted monitoring data, and compare it with the actual data;

[0031] S4. If the comparison data does not exceed the threshold range, the crane is controlled to move and drop the beam. If it exceeds the threshold range, an alarm signal is issued.

[0032] Furthermore, setting up the pier area in S1 includes: constructing and installing a bracket according to the deadweight of the beam body, setting bracket settlement observation sections at 1 / 4 span, 1 / 2 span, 3 / 4 span and front and rear support points along each span, and setting 3 observation points symmetrically along the transverse direction of each observation section as signal nodes.

[0033] Specifically, according to the deadweight of the steel beam, there are 5 rows of steel piles in the longitudinal direction of a single span, with an interval of 4m, and 5 steel piles in the transverse direction. Each steel pile is 6 to 8m long. The height adjustment is mainly adjusted by steel piles with a length of 0.25 to 2m. Both ends of the steel piles have flange structures for connection. The steel piles are connected longitudinally and transversely with steel pipe scissor braces to enhance the overall stability.

[0034] Longitudinal and transverse beams (combined sections) are placed directly on the steel piles, and transverse strips are placed on the longitudinal beams with an interval of 30 cm. The transverse strips are arranged in long (14m) and short (6.5m) intervals. φ22 holes are drilled at both ends of the short transverse strip, and the side formwork lateral limiters are installed, and the bottom formwork is placed on the transverse strips.

[0035] After the steel piles are connected according to different lengths, they are installed in place by crane, and then the longitudinal and transverse inclined supports are connected. After the box girder is poured, when the strength reaches the design requirements, the initial tensioning begins. After the tensioning is completed, the jack at the bottom of the lower distribution beam can be used to make the bracket and the bottom formwork fall uniformly and separate from the beam. After separation, the jack is locked, the bottom formwork is pulled out, the longitudinal and transverse beam system is dismantled, and the bracket erection is completed.

[0036] Furthermore, the foundation settlement was measured at the observation point using the hanging ruler method.

[0037] Specifically, an iron nail is driven into the bottom of the bottom formwork of the box beam at the observation point, and a steel tape measure is hung on the iron nail for observation during measurement. In addition, corresponding to the support settlement observation section, a foundation settlement observation point is also set on the foundation concrete surface after foundation treatment to measure the foundation settlement during the preloading process.

[0038] Furthermore, the measured settlement values ​​include pre-loading using a method combining sandbags and water tanks. The sandbag stacking thickness and the water tank height are calculated based on a ballast weight of 120% of the box girder weight. During construction, the sandbags are first stacked to the designed height, and then a rubber water tank is placed on top of the sandbags and water is pumped into it until the water tank is full.

[0039] Specifically, color strips are laid on the bottom formwork, and then sand bags are stacked in layers to the designed height. A rubber water tank is then placed on top and filled with water until the tank is full. The total loading weight of the sand bags and water tank is 1.2 times the weight of the box beam to eliminate foundation settlement and inelastic deformation of the support. Loading is carried out in stages to make the loading process as consistent as possible with the state of pouring concrete.

[0040] The sandbags must be weighed bag by bag, and the water tank must be filled to a strictly controlled degree of fullness according to the designed height (to reach the designed water tank height). Colored strips of cloth should be laid on the surface of the sandbags loaded onto the bracket to prevent the sandbags from absorbing water due to rainfall and causing changes in the loading weight, and accidental leakage of the water tank from causing the bottom template to be soaked and deformed.

[0041] Loading can be carried out in three levels. The first observation is carried out before loading begins, which serves as the zero point for settlement observation. The first loading simulates the load after the box girder bottom plate and web reinforcement are tied, and the steel strands and various formworks and reinforcement measures are installed. Observation is conducted again immediately after loading to obtain the foundation settlement and support deformation after the first load is applied. Observation is conducted again before the second load is applied. The second loading simulates the load after the bottom plate and web concrete are poured. Observation is conducted again immediately after loading to obtain the foundation settlement and support deformation after the second load is applied. Observation is conducted again before the third load is applied. The third loading simulates the load after the top plate concrete is poured. Observation is conducted again immediately after loading to obtain the foundation settlement and support deformation after the third load is applied.

[0042] After all loading is completed, observation work is carried out during the preloading time until the settlement becomes stable. Each level of loading and unloading should be measured and recorded in detail. After the preloading is completed and the unloading is completed, the template height is determined according to the foundation settlement observation record and the support deformation record. The pre-arch setting needs to wait until the foundation and support are observed to be stable before unloading step by step. The foundation settlement, elastic deformation and inelastic deformation are calculated based on the observation data before and after unloading, and the pre-arch setting is based on the elastic deformation of the foundation and support.

[0043] Furthermore, in addition to the steel box girder pushing slide, after replacing the formal support, the box girder is lifted up using the lifting jacks installed on each main bridge pier. The entire weight of the box girder is supported by the lifting jacks. According to the oil pressure value of the lifting jacks, the lifting force of each jack is calculated, and the measured support reaction force is obtained.

[0044] Furthermore, the actual measurement of prestress includes embedding vibrating wire strain gauges in several sections of the main beam, and monitoring is performed once when the concrete pouring of each beam section is completed and the prestressing is completed.

[0045] Furthermore, a simulation model is constructed based on BIM technology, and the generated predictive monitoring data includes theoretical settlement value, theoretical support reaction force and theoretical prestress.

[0046] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0047] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An intelligent control device for rapid and continuous beam drop of mid-span steel beams, characterized in that: It includes a diamond truss and a hydraulic lifting device. The hydraulic lifting device is arranged at the front upper cross beam of the diamond truss.

2. According to claim 1, the intelligent control device for rapid and continuous beam drop of mid-span steel beams is characterized in that: Hydraulic lifting equipment includes lifting jacks, hydraulic pump stations and lifting slings.

3. An intelligent control method for rapid and continuous beam drop of mid-span steel beams, characterized in that: The following steps are involved: S1. Set up signal nodes and sensors in the pier area to obtain pier main beam data; S2, numbering the signal nodes and numbering the bridge pier areas according to the nodes; S3, construct a simulation model based on the bridge pier and main beam data to obtain predicted monitoring data, and compare it with the actual data; S4. If the comparison data does not exceed the threshold range, the crane is controlled to move and drop the beam. If it exceeds the threshold range, an alarm signal is issued.

4. The intelligent control method for rapid and continuous beam drop of mid-span steel beams according to claim 3 is characterized in that: The pier area in S1 includes: building and installing brackets according to the deadweight of the beam, setting bracket settlement observation sections at 1 / 4 span, 1 / 2 span, 3 / 4 span and front and rear support points along each span, and setting 3 observation points symmetrically along the transverse direction of each observation section as signal nodes.

5. The intelligent control method for rapid and continuous beam drop of mid-span steel beams according to claim 3 is characterized in that: The observation point measurement includes measuring the settlement height with a hanging ruler method, pre-pressing with a combination of sandbags and water tanks to obtain the actual settlement value, and obtaining the support reaction force with a lifting jack.

6. The intelligent control method for rapid and continuous beam drop of mid-span steel beams according to claim 3 is characterized in that: A simulation model is constructed based on BIM technology to obtain theoretical settlement values ​​and theoretical support reactions.

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