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You are here: 159Ʊ > Technical Literature > Product Description > How can CNC bridge tensioning systems be sold? @ 新闻

桥梁数控张拉系统哪有数控张拉系统哪卖@新闻 Title How to sell CNC tensioning system for bridges

发布时间:2020/1/12 阅读次数:20次>>进入该公司展台 Provided by: Anhui Lianta Shengtong Machinery Manufacturing Co., Ltd. Release time: 1/12/2020 Read times: 20 times

How to sell bridge CNC tensioning system
Application area : Intelligent tensioning system Working principle: Pre-stressed intelligent tensioning system uses pre-stress as the control index, elongation error as the calibration index, and collects the working pressure and steel strand of each tensioning device (jack) through sensing. Elongation (including retraction) and other data, and real-time transmission of the data to the computer for analysis and judgment, while the tensioning equipment (pump station) receives system instructions, real-time variable-frequency motor operating parameters, so as to achieve high-precision real-time regulation of the oil pump motor Speed to control the tension and loading speed. The system also sends instructions from the computer according to a preset program to control each mechanical action of each device synchronously to complete the entire tensioning process automatically.
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During tensioning, the oil pipes and control cables must be straight, and they must not be twisted and rolled to prevent the oil pipes and cables from being torn. Also, after the problem occurs, the time should be to press the oil pump stop button on the control cabinet panel. If it is ignored, it may cause damage. The oil pipe is broken, and the oil pump must be stopped and inspected immediately if it is not operating normally. You cannot turn the screw at will under pressure. Smart tensioning equipment is used as a bridge instrument by many construction teams. It can be seen both in bridge construction and highway construction today. Xiaobian introduces you to the use of intelligent tensioning equipment. I hope to help everyone more Learn about smart tensioning equipment. To ensure the jack components, the jack is equipped with a valve nipple during the return stroke. When the valve is operated improperly and overpressured, the valve disc is broken, and the oil discharge pressure drops to protect it. At this time, the nipple that can be replaced by the bypass of the nozzle is continued to be used.
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How to sell CNC tensioning system for bridges @ 新 新 技术 Improve the quality of the project According to the person in charge of the Tonghuang Expressway Project, according to the requirements of the construction design, the Tonghuang Expressway uses four-top synchronous symmetry in the tensioning construction. La Zhang. In traditional construction, prestressed tensioning relies on manual operation, it is difficult to achieve precise synchronization, and it is impossible to achieve four-top synchronized tensioning, and the tensioning data is completely recorded manually, which leaves a huge space for humans. Once the tension is not in place, the bearing capacity and service life of the beam structure will be damaged, leading to the need to strengthen and maintain the bridge in advance. The most serious consequence is that the bridge will collapse and bring huge hidden dangers to the lives and property of the people.
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Application case : In today's bridge and road construction, prestressed construction is widely used. Among them, the key process-tensioning, the quality of the construction will directly affect the durability of the structure, but the traditional tensioning construction is purely construction. The manual operation is based on experience, and the error rate is very high, which cannot guarantee the prestressed construction quality. Many bridges were forced to be reinforced in advance due to unqualified prestressed construction, which caused serious or even sudden collapse, causing huge loss of life and property to the society. Due to the high precision and stability of the intelligent system, the intelligent tensioning technology can completely eliminate human interference and effectively ensure the quality of prestressed tensioning construction. It is an advanced technology in the field of domestic prestressed tensioning. Mechanical equipment factory direct sales of intelligent tensioning equipment, intelligent grouting equipment, pre-stressed intelligent tensioning system, high-frequency vibrator and other intelligent tensioning / pulping equipment, complete specifications, reliable quality, welcome to buy!
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The power supply system should have a reliable grounding system to avoid injury due to leakage. 2. Inspection of oil pumps For newly purchased oil pumps, or before commissioning after long-term storage, inspection should be performed in accordance with "Prestressed Electric Oil Pumps" JG / T319 to prevent malfunctions during use and affect construction progress. No-load operation: After the oil circuit and circuit are connected, the oil quantity should be checked before starting, and it must not be lower than the specified offline. The valve is in the open position. After starting at no load, observe that the motor rotates smoothly without large vibration and noise. After normal operation, check the no-load measurement. The three averages must not be lower than 95% of the theoretical design value and not higher than 110% of the theoretical flow rate. After the no-load inspection is qualified, the oil drain port can be blocked, and the full-load inspection can be performed. Raise to the nominal pressure for 2 minutes, and observe whether there is leakage and the needle movement. Advantages of the intelligent tensioning device: The main pump and the auxiliary pump of the intelligent tensioning device use a wireless connection interval of no more than 200M. The auxiliary pump will transfer the displacement and pressure signals to the main pump. Today, the most commonly used instruments for calibrating smart tensioning equipment are pressure testing machines. Due to the needs of the testing machine itself, the working piston of the jack was first partially ejected without contact with the pressure plate of the press, and then the jack was stopped. Automatic operation, then start the press, apply pressure to the surface of the jack piston to tighten the piston to increase the pressure, up to the predetermined maximum pressure value. It can be seen that in this kind of calibration operation, the lack of a jack that should be operated automatically is in a forced operation situation. During calibration, the rotation direction of the jack piston is inconsistent with the actual tension operation. This will inevitably cause some errors due to the internal friction of the jack, the transmission loss of the oil pipe and the output connection of the oil pump and pressure gauge. In addition, the punctual jacks are placed vertically instead of horizontally during normal field operations, which also brings errors. When the same jack is under different operating conditions, the direction of friction between the piston and the inner wall of the cylinder is different. It is used in conjunction with the same pressure gauge. The pressure is the same under two different operating conditions, but the external practical force is different.
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Shelf life : Reduced structural risks such as cracking, underwinding, and damage to the bridge caused by the lack or excess of prestressing force, which helps to ensure structural safety, improve durability, extend bridge life, and reduce maintenance and repair costs. 2. The NC tensioning equipment system has completed synchronous and symmetrical tensioning, which eliminates the hazards caused by the distortion of the structure due to the asynchronous symmetrical tensioning. 3. After actively controlling the tensioning process, the loss of prestress during the tensioning process is greatly reduced to ensure that the effective prestress meets the planning requirements. 4. The CNC tensioning equipment system has completed the effective handling, monitoring and error correction of the entire tensioning process. Proactively generate reports to eliminate data. Network monitoring and data archiving were implemented for the construction unit, quality supervision part and owner unit. Strengths: 1. Ultra-high pressure active hydraulic valve group: The advanced electronic control valve group in the hydraulic system is selected to increase reliability and sensitivity. 2. Programmatic control skills: The intelligent tension detection software completes the programmatic control of the hydraulic system startup, oil inlet, oil return, flow, pressure relief, and suspension, and the entire tensioning process is completed automatically.

The pre-stressed intelligent tensioning device is controlled by a computer to simultaneously and simultaneously lift multiple jacks. During the tensioning process, the sensor collects pressure values and displacement values in real-time monitoring and feedback to the computer to automatically calculate the elongation and check the elongation. Synchronized control with tensioning, with intelligent, reliable and accurate construction. The prefabricated box girder concrete has reached 85% hardness. After 7 days, the tensile steel strand can be constructed. The quality inspection of the steel strand before use should meet the design specifications and requirements. The displacement of the auxiliary pump of the pre-stressed intelligent tensioning equipment, the pressure signal is transmitted to the main pump, and the signal processing of the main pump will be transmitted to the industrial computer. The industrial computer will use the programmable logic controller to operate the auxiliary pump. The two play a complementary role. In this way, the oil output, oil return and stop of the jack are controlled. The main pump wirelessly transmits the on-site tensile parameters to the industrial computer for monitoring and automatically stores the tension records in the construction history. The results of the tensioning are automatically reported during the tensioning process. The tension and elongation curves are automatically uploaded, and the tensioning results are automatically uploaded when the tensioning is completed. The beam field management computer simultaneously reports the tensioning process curve and the results of the initiation to the superior information monitoring center via the network for inspection and review. Intelligent tensioning equipment construction preparation before tensioning 1. The matching calibration of jacks and pressure sensors is carried out in strict accordance with the specifications for 6 months. 2. Carry out dry running test rotation of the approach equipment to ensure that all equipment can work normally, check the limit plate, tool anchor, etc., and ensure that the tools are all intact. 3. Do a good job of the inspection and submission of anchors and clips, and ensure that the frequency of the outsourcing inspection of anchors, clips and other qualified materials must meet the requirements of the JTG / TF50-2011 specification. 4. Check whether the stretched working length of the stranded wire meets the construction requirements, check whether the stranded wire has rust, oil stains and other factors that affect the tensioning to ensure that the stranded wire is qualified. 5.Clean the concrete and rubbish at the tension slot and the anchor pad, check whether the grouting hole of the anchor pad is blocked, and check whether the concrete behind the anchor pad is loose and incomplete, to prevent the tension from appearing after tension. The phenomenon that the anchor plate is trapped in the lumps appears.

In addition, a large number of force sensors embedded in the prestressed structure cannot be reused after construction, increasing the cost of the building. On the other hand, the data collection and processing in the construction process are completed by computer. Obviously, this has higher requirements for the quality of prestressed construction personnel. Prestressed digital intelligent tensioning equipment overcomes many problems existing in traditional prestressed construction technology, and has the following characteristics: ①High accuracy. It can guarantee the tensile accuracy in the range of 1%, which greatly improves the tensile accuracy compared with the conventional prestressed construction process. It can well ensure the design intent, and effectively avoid the engineering accident of the prestressed structure caused by the uncontrollable tensile tension and pretensioned tensile length. ② Efficiency. The tensioning process is digitalized, reducing the construction staff from 5 to 2. It can overcome the inefficient factors of manual operation and make the construction quick and easy. ③ Double synchronous control of prestressed tension can be realized. On-site monitoring of the effective tensile force on site shows that in a prestressed frame structure, periodic fluctuations in ambient temperature will cause changes in the effective prestress in the prestressed members, and the fluctuation of the effective prestress exceeds the allowable deviation value of 5% in the current code. There is a clear correlation between prestress and ambient temperature and concrete temperature. Therefore, the effect of temperature effects must be considered in the construction of prestressed intelligent tensioning equipment. There is a QR code posted on the web position of each T-beam in the project department. To understand the information, simply scan the QR code with intelligence, etc., T-beam beam number, beam length, beam type, horizontal and vertical slope, embedded steel plate, pouring Details such as time, pouring staff, tensioning and grouting can be seen at a glance. Selection and requirements of intelligent tensioning equipment: 1. The rated tonnage of the tensioning jack should be 1.5 times the tension and not less than 1.2 times. It must be performed before use. Correction, the correction coefficient must not be greater than 1.05. The validity period of the correction is one month and no more than 200 tensioning operations. The stroke of the tensioning jack should meet the requirements of the tensioning process; 2. The tensioning jack, pressure gauge, and oil pump should be calibrated, Supporting use. When an abnormal phenomenon occurs during use, it should be recalibrated. 3. The rated pressure of the oil pump should be 1.4 times the corresponding tension value. The fuel tank capacity should be 1.5 times the total oil delivery of the tension jack; 4. The pressure gauge should be anti-vibration, and the larger reading should be 1.5 to 2.0 times the corresponding pressure value of the tensile force. The accuracy should not be less than 1.0. It must be verified by the metrology department before the first use. It must be regularly verified when used. The validity period is one week. When using class 0.4, the validity period of the test can be one month. The main manifestations are: ① other burns and bruised steel strands such as welding slag during construction; ② the quality of the steel strand itself; ③ the pre-stress degree is greater than the design Prestressing degree; ④ the quality of the clips and the installation misalignment (tool anchor, work clip); ⑤ the friction of the curve segment is too large; 6 the limit plate is not matched (the limit is too large and too small).

The high-pressure oil pipe should be subjected to a comparative test before use, and those that are unqualified should not be used. Tension anchors should be used in conjunction with the machine. When the anchors enter the site, they should be inspected in batches without cracks, scars, and rust. Use; jacks and pressure gauges should be calibrated; bolts, nuts and iron wedges used must not have slip wires and cracks. Tensioning equipment should be used and managed by someone, and it should be maintained regularly and checked regularly. When the oil pump is started, the speed of oil inlet and return and the lifting of the pressure gauge pointer should be stable and uniform. The safety valve on the oil pump should be adjusted to a state where the maximum working oil pressure cannot be opened automatically. Safety valves should be sensitive and reliable. The installation of the oil pressure gauge must be tight and fully buckled. The high-pressure oil pipe used between the oil pump and the jack, as well as the joints of the oil circuit, must be complete and tight, the oil circuit is unobstructed, and it should be kept at the maximum working oil pressure for more than 5 minutes. Replace if damaged. Connection point between high-pressure oil pump and jack. Can set the target value of tensile force, target value of displacement check, holding time, etc. The tension is synchronized and balanced during tensioning. The pressure and displacement sensors collect data in time to simulate and convert the digital display of the tension value and the tensile length of the steel strand. The computer automatically calculates the elongation and timely checks whether the elongation error is within 6%. To achieve "double control" of stress and elongation, the continuous in-situ cast-in-situ box girder steel strands automatically reach the recorded value after the extension reaches the top. (Section 7.6.3 of the construction code for highway bridges and culverts stipulates that "When the prestressed tendons are tensioned using the stress control method, the elongation should be checked .... The deviation should be controlled within 6%.) Standard tensioning process: prestressing The system realizes the intelligent control of the prestressed tensioning program, which is not affected by man-made and environmental factors; the tensioning process elements such as the stopping point, loading rate, and holding time meet the requirements of the bridge design load construction specification, avoiding or greatly increasing the tensioning process Loss of prestressing.

Keywords: CNC tensioning system

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