A method for using a precast beam overall launching device

Abstract

This invention relates to a method of using a precast beam integral tensioning device. The precast beam integral tensioning device includes: a U-shaped pad on the side of the steel beam and a movable U-shaped pad; one end of the U-shaped pad on the side of the steel beam has a positioning groove, and the end of the movable U-shaped pad facing the U-shaped pad on the side of the steel beam is connected to a positioning strip, the movable U-shaped pad being connected to the positioning groove of the U-shaped pad on the side of the steel beam through the positioning strip; a hydraulic jack is connected inside the groove of the U-shaped pad on the side of the steel beam; a lifting lug is connected to the back of the movable U-shaped pad; the method of use includes: step S1, assembling the tensioning device and placing the tensioning device; step S2, placing the hydraulic jack; step S3, activating the hydraulic jack to hold the pressure column; step S4, removing the movable U-shaped pad and controlling the hydraulic jack to retract; step S5, removing the hydraulic jack. This invention has high control precision and convenient and quick extension and retraction.

Description

Technical Field

[0001] This invention relates to a method of using a precast beam integral tensioning device. Background Technology

[0002] Prestressed precast beams using the pre-tensioning method have the advantages of short construction period and less maintenance, and have been widely used in waterway and bridge projects, especially wharf projects, both domestically and internationally.

[0003] Prestressed precast beams are typically fabricated using reinforced concrete frame-type prestressed precast platforms, and multiple beams can be produced simultaneously on a single platform.

[0004] Currently, the commonly used tension release processes for prestressed steel bars are: the overall tension release process using jacks and the sand box tension release process. The sand box tension release process suffers from drawbacks, including the heavy weight of the sand boxes, difficulty in simultaneous unloading, slow sand release and filling, uneven tension release, and low levels of automation. The overall tension release process using jacks requires specialized large-tonnage jacks or the prolonged use of jacks during tensioning and release. Furthermore, the long-term occupation of jacks on each production line prevents rapid turnover, necessitating the purchase of a large number of jacks, resulting in significant costs. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing methods by providing a method for using a precast beam integral tensioning device, which has high control precision and convenient and quick extension and retraction.

[0006] The technical solution to achieve the above objective is: a method for using a precast beam integral tensioning device, the precast beam integral tensioning device comprising: a steel beam side U-shaped pad and a movable U-shaped pad;

[0007] One end of the U-shaped pad on the steel beam side has a positioning groove. A positioning strip is connected to the end of the movable U-shaped pad facing the steel beam side U-shaped pad. The movable U-shaped pad is connected to the positioning groove on the steel beam side U-shaped pad via the positioning strip. A hydraulic jack is connected inside the groove of the steel beam side U-shaped pad. A lifting lug is connected to the back of the movable U-shaped pad. The method of use includes:

[0008] Step S1: Assemble and place the tension release device;

[0009] Step S2: Place the hydraulic jack;

[0010] Step S3: Activate the hydraulic jack to hold the pressure column in place;

[0011] Step S4: Remove the movable U-shaped pad and control the hydraulic jack to retract;

[0012] Step S5: Remove the hydraulic jack.

[0013] Preferably, step S1, assembling the tension release device and placing the tension release device, includes:

[0014] Step S11: Connect the movable U-shaped pad to the positioning groove of the U-shaped pad on the side of the steel beam through the positioning strip;

[0015] Step S12: Assemble the U-shaped pads into a whole and place them between the movable steel beam and the pressure column; so that the U-shaped pads on the steel beam side are connected to the movable steel beam, and the movable U-shaped pads are connected to the pressure column.

[0016] Preferably, step S2, placing the hydraulic jack, includes:

[0017] Step S21: Place the hydraulic jack in the U-shaped pad groove on the side of the steel beam, so that the fixed end of the hydraulic jack faces the movable steel beam and the telescopic end faces the pressure column.

[0018] Preferably, step S3, activating the hydraulic jack to hold the pressure column, includes:

[0019] Step S31: Activate the hydraulic jack to extend the oil inlet piston rod, allowing the hydraulic jack to bear the full support load and creating a micro-gap between the movable U-shaped pad and the pressure column.

[0020] Preferably, step S4, removing the movable U-shaped pad and controlling the hydraulic jack to retract, includes:

[0021] Step S41: Use lifting equipment to remove the movable U-shaped pad upwards through the lifting lugs;

[0022] Step S42: Start the hydraulic jack and control the piston rod to slowly retract, so as to release the tension as a whole until the tension is completed.

[0023] Preferably, step S5, removing the hydraulic jack, includes:

[0024] Step S51: After the tension is released, control the hydraulic jack to continue retracting until the stroke returns to zero, then remove the jack for reuse.

[0025] Preferably, a fixing buckle is provided in the mating surface between the U-shaped pad on the steel beam side and the movable U-shaped pad to fix the movable U-shaped pad.

[0026] Preferably, when the steel beam-side U-shaped pad and the movable U-shaped pad are assembled, the opening of the steel beam-side U-shaped pad faces upward, and the opening of the movable U-shaped pad faces downward.

[0027] The beneficial effects of this invention are as follows: In the method of using this precast beam overall tension release device, during the prestressing tendon holding and anchoring stage, a combination of one movable U-shaped pad and one fixed U-shaped pad on the side of the steel beam is used as a transition support to replace the sand box holding the load. During the tension release stage, a hydraulic jack is used to replace the U-shaped pad assembly. The overall tension release is achieved by utilizing the telescopic function of the hydraulic jack, thereby fully leveraging the advantages of the hydraulic jack, which can synchronously control telescopic movement, has high control precision, is convenient and quick to telescopic, and has a high degree of automation.

[0028] The extension and retraction of hydraulic jacks can be achieved by operating the hydraulic system, while sand box processes can only be operated manually. Moreover, the sand boxes themselves are bulky, resulting in slow sand release and filling. After using this device, the level of mechanization and automation of the production process is improved, manpower is reduced, the labor intensity of workers is reduced, and work efficiency is improved. This helps to save labor costs, improve production efficiency, and generate economic benefits.

[0029] During the prestressed tendon holding and anchoring stage, a combination of movable U-shaped pads and steel beam side-fixed U-shaped pads is used as a transition support to achieve the load holding function. During this stage, the jacks can be removed from the production line and reused for other production lines, which is highly flexible. Only one set of equipment is needed to complete the operation of multiple production lines, and the investment cost is relatively low. Attached Figure Description

[0030] Figure 1 This is a flowchart illustrating the usage method of the precast beam integral tensioning device of the present invention;

[0031] Figure 2 This is a detailed flowchart of step S1 of the present invention;

[0032] Figure 3 This is a detailed flowchart of step S2 of the present invention;

[0033] Figure 4 This is a detailed flowchart of step S3 of the present invention;

[0034] Figure 5 This is a detailed flowchart of step S4 of the present invention;

[0035] Figure 6 This is a detailed flowchart of step S5 of the present invention;

[0036] Figure 7 This is a schematic diagram of the precast beam integral tensioning device of the present invention;

[0037] Figure 8 This is a schematic diagram showing the disassembled precast beam integral tensioning device of the present invention;

[0038] Figure 9 This is a schematic diagram illustrating the installation and use of the precast beam integral tensioning device of the present invention;

[0039] Figure 10 This is a detailed diagram of the connection position between the U-shaped pad on the steel beam side and the movable U-shaped pad of the present invention;

[0040] Figure 11 This is a detailed connection diagram of the precast beam integral tensioning device of the present invention;

[0041] Figure 12 This is a detailed diagram showing the connection between the hydraulic jack and the movable U-shaped pad of the present invention;

[0042] Figure 13 This is a schematic diagram of the removal of the movable U-shaped pad of the present invention;

[0043] Figure 14 This is a schematic diagram of the retraction of the hydraulic jack of the present invention.

[0044] In the diagram: 1. Steel beam side U-shaped pad; 2. Movable U-shaped pad; 3. Hydraulic jack; 4. Positioning groove; 5. Positioning strip; 6. Lifting lug; 7. Movable steel beam; 8. Pressure column; 9. Prestressed tendon. Detailed Implementation

[0045] The technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] The invention will now be further described with reference to the accompanying drawings.

[0047] like Figure 1-14 As shown, a method for using a precast beam integral tensioning device is described. The precast beam integral tensioning device includes: a steel beam side U-shaped pad 1 and a movable U-shaped pad 2; one end of the steel beam side U-shaped pad 1 is provided with a positioning groove 4, and the end of the movable U-shaped pad 2 facing the steel beam side U-shaped pad 1 is connected to a positioning strip 5, and the movable U-shaped pad 2 is connected to the positioning groove 4 of the steel beam side U-shaped pad 1 through the positioning strip 5; a hydraulic jack 3 is connected inside the groove of the steel beam side U-shaped pad 1; a lifting lug 6 is connected to the back of the movable U-shaped pad 2; a movable steel beam 7 is connected to the end of the steel beam side U-shaped pad 1 away from the movable U-shaped pad 2, and a pressure column 8 is connected to the end of the movable U-shaped pad 2 away from the steel beam side U-shaped pad 1; multiple prestressing tendons 9 pass through the pressure column 8 and the movable steel beam 7.

[0048] Usage instructions include:

[0049] Step S1: Assemble and place the tension release device;

[0050] Step S1, assemble the tension release device, including placing the tension release device:

[0051] Step S11: Connect the movable U-shaped pad 2 to the positioning groove 4 of the U-shaped pad 1 on the side of the steel beam via the positioning strip 5;

[0052] Step S12: Assemble the U-shaped pads into a whole and place them between the movable steel beam 7 and the pressure column 8; so that the U-shaped pad 1 on the steel beam side is connected to the movable steel beam 7, and the movable U-shaped pad 2 is connected to the pressure column 8. Fixing buckles are provided in the mating surfaces of the U-shaped pad 1 on the steel beam side and the movable U-shaped pad 2 to fix the movable U-shaped pad 2. When assembling the U-shaped pad 1 on the steel beam side and the movable U-shaped pad 2, the opening of the U-shaped pad 1 on the steel beam side faces upward, and the opening of the movable U-shaped pad 2 faces downward. During the tensioning and load-bearing anchoring stages, the U-shaped pad assembly acts as a support to bear the load. The movable U-shaped pad 2 and the U-shaped pad 1 on the steel beam side are joined by a tongue and groove joint. The opening of the U-shaped pad 1 on the steel beam side faces upward for easy installation and removal of the hydraulic jack 3, and the opening of the movable U-shaped pad 2 faces downward for easy installation and removal. The U-shaped pad assembly provides transitional support during the prestressing tensioning and load-bearing stages, and the movable U-shaped pads can be flexibly removed during the release stage.

[0053] Using U-shaped pads for load holding, the jacks can be removed and used on other production lines during production. Only one pair of jacks is needed to complete the tensioning operations of multiple tensioning production lines. The other two jacks can be controlled by an intelligent control system to maintain the overall tensioning synchronization and uniformity.

[0054] Step S2, place the hydraulic jack 3;

[0055] Step S2, placing the hydraulic jack 3 includes:

[0056] Step S21: Place the hydraulic jack 3 in the groove of the U-shaped pad 1 on the side of the steel beam, so that the fixed end of the hydraulic jack 3 faces the movable steel beam 7 and the telescopic end faces the pressure column 8.

[0057] Step S3: Activate hydraulic jack 3 to hold the pressure column 8;

[0058] Step S3, activating the hydraulic jack 3 to hold the pressure column 8 includes:

[0059] Step S31: Start the hydraulic jack 3 to extend the oil inlet piston rod, so that the hydraulic jack 3 bears the full support load and creates a micro gap between the movable U-shaped pad 2 and the pressure column 8.

[0060] Step S4: Remove the movable U-shaped pad 2 and control the hydraulic jack 3 to retract;

[0061] Step S4, removing the movable U-shaped pad 2 and controlling the hydraulic jack 3 to retract includes:

[0062] Step S41: Use lifting equipment to remove the movable U-shaped pad 2 upwards via the lifting lug 6;

[0063] Step S42: Start the hydraulic jack 3, control the piston rod to slowly retract, and release the tension as a whole until the tension is complete.

[0064] Step S5: Remove hydraulic jack 3.

[0065] Step S5, removing hydraulic jack 3 includes:

[0066] Step S51: After the tension is released, control the hydraulic jack 3 to continue retracting until the stroke returns to zero, then remove the jack for reuse.

[0067] The method of using this precast beam overall tension release device is as follows: during the prestressing tendon holding and anchoring stage, a combination of one movable U-shaped pad 2 and one fixed U-shaped pad 1 on the side of the steel beam is used as a transition support to replace the sand box for holding the load. During the tension release stage, a hydraulic jack 3 is used to replace the U-shaped pad assembly. The overall tension release is achieved by utilizing the telescopic function of the hydraulic jack 3, thereby giving full play to the advantages of the hydraulic jack, which can synchronously control the telescopic movement, has high control accuracy, is convenient and quick to telescopic, and has a high degree of automation.

[0068] Specifically, the sand box tensioning process requires manual filling and releasing of sand to achieve length variations, resulting in low precision. Furthermore, the shrinkage of the sand boxes on both sides of the steel beam during tensioning is manually controlled, making it impossible to maintain consistency. Uneven unloading can easily lead to uneven loading. In contrast, the extension and retraction of the hydraulic jacks are controlled by the tensioning system, resulting in synchronized actions, uniform unloading, and high precision, thus ensuring safety and quality.

[0069] Specifically, the extension and retraction of the hydraulic jack 3 can be achieved by operating the hydraulic system, while the sand box process can only be operated manually, and the sand box itself is bulky, resulting in slow sand release and filling. After using this device, the level of mechanization and automation of the production process is improved, manpower is reduced, the labor intensity of workers is reduced, and work efficiency is improved, which is conducive to saving labor costs, improving production efficiency, and generating economic benefits.

[0070] Specifically, during the prestressed tendon load-bearing and anchoring stage, a combination of movable U-shaped pads and steel beam side-fixed U-shaped pads is used as transitional support to achieve the load-bearing function. During this stage, the jacks can be removed from the production line and reused for other production lines, which is highly flexible. Only one set of equipment is needed to complete the operation of multiple production lines, and the investment cost is relatively low.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of using a precast beam integral launching device, the precast beam integral launching device comprising: Steel beam side U-shaped pad (1) and movable U-shaped pad (2); A positioning groove (4) is provided at one end of the U-shaped pad (1) on the side of the steel beam. A positioning strip (5) is connected to the end of the movable U-shaped pad (2) facing the U-shaped pad (1) on the side of the steel beam. The movable U-shaped pad (2) is connected to the positioning groove (4) of the U-shaped pad (1) on the side of the steel beam through the positioning strip (5). A hydraulic jack (3) is connected in the groove of the U-shaped pad (1) on the side of the steel beam. A lifting lug (6) is connected to the back of the movable U-shaped pad (2). The end of the U-shaped pad (1) on the side of the steel beam away from the movable U-shaped pad (2) is connected to the movable steel beam (7), and the end of the movable U-shaped pad (2) away from the U-shaped pad (1) on the side of the steel beam is connected to the pressure column (8); multiple prestressed tendons (9) pass through the pressure column (8) and the movable steel beam (7); A fixing buckle is provided in the joint surface between the U-shaped pad (1) on the side of the steel beam and the movable U-shaped pad (2) to fix the movable U-shaped pad (2). When the steel beam side U-shaped pad (1) and the movable U-shaped pad (2) are assembled, the opening of the steel beam side U-shaped pad (1) faces upward, and the opening of the movable U-shaped pad (2) faces downward. Its characteristic is that the method of use includes: Step S1: Assemble and place the tension release device; Step S2, place the hydraulic jack (3); Step S3: Start the hydraulic jack (3) to hold the pressure column (8); Step S4: Remove the movable U-shaped pad (2) and control the hydraulic jack (3) to retract; Step S5, remove the hydraulic jack (3); Step S1, assembling the tension release device, includes placing the tension release device as follows: Step S11: Connect the movable U-shaped pad (2) to the positioning groove (4) of the U-shaped pad (1) on the side of the steel beam through the positioning strip (5); Step S12: The assembled U-shaped pads are placed between the movable steel beam (7) and the pressure column (8); the U-shaped pads (1) on the steel beam side are connected to the movable steel beam (7), and the movable U-shaped pads (2) are connected to the pressure column (8); during the tensioning and load-bearing anchoring stages, the U-shaped pad assembly serves as a support to bear the load; the movable U-shaped pads (2) and the U-shaped pads (1) on the steel beam side are connected by tongue and groove joints, with the opening of the U-shaped pads (1) facing upwards to facilitate the installation and removal of the hydraulic jack (3), and the opening of the movable U-shaped pads (2) facing downwards to facilitate its own installation and removal. The U-shaped pad assembly realizes the transition support during the prestressing tensioning and load-bearing stages, and the movable U-shaped pads can be flexibly removed during the release stage; Step S2, placing the hydraulic jack (3) includes: Step S21: Place the hydraulic jack (3) in the groove of the U-shaped pad (1) on the side of the steel beam, so that the fixed end of the hydraulic jack (3) faces the movable steel beam (7) and the telescopic end faces the pressure column (8). Step S3, activating the hydraulic jack (3) to hold the pressure column (8), includes: Step S31: Start the hydraulic jack (3) to extend the oil inlet piston rod, so that the hydraulic jack (3) bears the full support load and creates a micro gap between the movable U-shaped pad (2) and the pressure column (8); Step S4, removing the movable U-shaped pad (2) and controlling the hydraulic jack (3) to retract, includes: Step S41: Use lifting equipment to remove the movable U-shaped pad (2) upward through the lifting lug (6); Step S42: Start the hydraulic jack (3) and control the piston rod to slowly retract, so as to release the tension as a whole until the tension is completed; Step S5, removing the hydraulic jack (3), includes: Step S51: After the tension is released, control the hydraulic jack (3) to continue to retract until the stroke returns to zero, and then take out the jack for reuse.

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