A construction technology of broken line prestressed concrete I-beam

Abstract

The present application relates to a construction process for a folded-line prestressed concrete I-beam, and relates to the technical field of prestressed concrete engineering. The process includes a pre-tensioning preparation step, a prestressed steel bar laying step, a pre-tensioning protection step, a steel bar tensioning step, a concrete beam forming step, a steel bar cutting preparation step, and a tensioning step. In the pre-tensioning preparation step, a steel bar cutting device is installed, and the steel bar cutting device includes a cover, a lifting mechanism, a triggering and starting mechanism, and a cutting mechanism. In the pre-tensioning protection step, a telescopic protective cover is provided, and the telescopic protective cover can adaptively expand and contract as the positions of the fixed beam and the movable beam change, so that the prestressed steel bar segment between the fixed beam and the movable beam is always within the telescopic protective cover. The present application has the effect of improving the problems of high risk, low cutting efficiency, and high labor intensity during construction.

Description

Technical Field

[0001] The present application relates to the technical field of prestressed concrete engineering, and in particular to a construction process for a broken-line prestressed concrete I-beam. Background Art

[0002] Currently, pre-tensioning construction technology has been applied in railway bridge construction. Pre-tensioned prestressed concrete is easy to prefabricate in factories and has gained recognition and widespread adoption for its advantages, including a short construction period, simple process, material savings, easily guaranteed construction quality, minimal maintenance, and excellent durability. Pre-tensioning involves stretching prestressed tendons before pouring the concrete component. These tendons are temporarily anchored to a pedestal or steel formwork using a clamp before pouring the component concrete. Once the tendons reach a certain strength (approximately 75%), the tendons are relaxed and severed. This allows the tendons to elastically retract, creating a pre-compressive stress within the concrete due to the bond between the concrete and the tendons.

[0003] Regarding the above-mentioned related technologies, the inventors believe that at present, when tensioning or cutting steel bars, the steel bars may be subjected to excessive stress and break, which makes the tensioning method more dangerous; and when cutting, multiple tensioning bars need to be cut in this way, which has low cutting efficiency and high labor intensity. Summary of the Invention

[0004] In order to improve the problems of high risk, low cutting efficiency and high labor intensity during construction, the purpose of this application is to provide a broken line pre-tensioned prestressed concrete I-beam construction process.

[0005] The present application provides a construction process for a broken-line prestressed concrete I-beam using the following technical solutions:

[0006] A construction process for a broken-line prestressed concrete I-beam, characterized by comprising the following steps:

[0007] Preparation steps before tensioning: Place the pedestal, hydraulic jack, fixed beam and movable beam in the designated position;

[0008] Steps for laying prestressed steel bars: Put the clamp on the prestressed steel bars, and insert the prestressed steel bars one by one through the hole of the movable beam and out of the hole of the fixed beam on the other side. Then use the tool to lock the clamp so that the two ends of the prestressed steel bars are fixed between the fixed beam and the movable beam respectively;

[0009] Protection steps before steel bar tensioning: a telescopic protective cover is set between the fixed beam and the movable beam. The telescopic protective cover can adapt to the change of the position of the fixed beam and the movable beam, so that the prestressed steel bar section between the fixed beam and the movable beam is always in the telescopic protective cover;

[0010] Steel bar tensioning steps: Use a hydraulic jack to tension the prestressed steel bars. The hydraulic jack is installed on the fixed beam. One end of the hydraulic jack piston rod is against the movable beam to extend the piston rod of the hydraulic jack.

[0011] Steps for forming the concrete I-beam: tie non-prestressed steel bars to the prestressed steel bars between the pedestals, support the concrete formwork on the non-prestressed steel bars, and pour concrete in the concrete formwork;

[0012] Preparation steps for cutting steel bars: A steel bar cutting device is installed on a pedestal directly above the concrete formwork, the steel bar cutting device comprising a cover, a lifting mechanism, a triggering and starting mechanism, and a cutting mechanism; the cover is used to shield the prestressed steel bars between the pedestals; the lifting mechanism is installed on the cover, the triggering and starting mechanism is installed on the lifting mechanism, and the cutting mechanism is installed on the triggering and starting mechanism; the lifting mechanism is used to drive the cutting mechanism to move vertically within the cover; the triggering and starting mechanism is used to automatically start the cutting mechanism when the lifting mechanism descends, so as to approach the prestressed steel bars and cut the prestressed steel bars between the pedestals, and automatically shut down the cutting mechanism and move away from the prestressed steel bars when the lifting mechanism ascends;

[0013] Tensioning steps: After the concrete is formed, the concrete formwork is removed, and then the prestressed steel bars between the pedestals are cut by the steel bar cutting device, and the cutting is shielded by a cover.

[0014] By adopting the above technical solution, during the process of tensioning the steel bars, the telescopic protective cover can adaptively expand and contract as the hydraulic jack is extended, that is, the prestressed steel bar segment between the movable crossbeam and the fixed crossbeam can be always covered, thereby covering the prestressed steel bar segment during the tensioning process, and separating the prestressed steel bar segment from the outside world when the prestressed steel bar segment suddenly breaks, thereby preventing the broken prestressed steel bar segment from injuring nearby workers; when the prestressed steel bar is cut, the cover can cover the formed concrete block and part of the prestressed steel bar beam, and the cutting mechanism can automatically cut the prestressed steel bar in the process of approaching the prestressed steel bar under the drive of the trigger starting mechanism, and does not require workers to actively approach the prestressed steel bar segment, thereby reducing the labor intensity of workers, and also to a certain extent avoiding the situation where workers approach the prestressed steel bar and cause it to break and hit the workers.

[0015] Optionally, the telescopic protective cover includes a fixed cover body and a movable cover body, the fixed cover body is detachably connected to the ground, the movable cover body is detachably connected to the movable crossbeam, and the movable cover body is slidably arranged on the fixed cover body.

[0016] By adopting the above technical solution, after the fixed cover body is detachably connected to the ground, only the movable cover body will move with the movement of the movable crossbeam. At this time, the telescopic protective cover can be normally expanded or contracted, so that the prestressed steel bars can always be covered during the process of tensioning the prestressed steel bars.

[0017] Optionally, a sliding bar is provided on the side wall of the movable cover along the length direction of the prestressed steel bar, and a sliding groove is provided on the inner side wall of the fixed cover, and the sliding bar is slidably provided in the sliding groove.

[0018] By adopting the above technical solution, the arrangement of the sliding strip and the sliding groove can guide the movement of the movable cover, so that the movable cover can move stably as the hydraulic jack is ejected.

[0019] Optionally, the lifting mechanism includes a cylinder and a base plate, the cylinder is vertically mounted on the cover, the piston rod of the cylinder passes through the top wall of the cover and extends vertically downward, the base plate is horizontally mounted on the end of the piston rod of the cylinder, and the trigger starting mechanism is mounted on the base plate; after the base plate contacts the formed concrete and continues to move downward, the trigger starting mechanism drives the cutting mechanism to operate.

[0020] By adopting the above technical solution, the cylinder is started, so that the piston rod of the cylinder extends vertically downward, which can drive the bottom plate to extend vertically downward and approach the formed concrete, and then the cutting mechanism can be brought close to the prestressed steel bars, so as to achieve the effect of automatically starting the cutting mechanism to cut the prestressed steel bars after the cutting mechanism approaches the prestressed steel bars.

[0021] Optionally, the trigger starting mechanism includes a transmission conversion channel, a resistance component and a power switching component; the transmission conversion channel is provided with one on each side of the base plate, the resistance component is installed between the base plate and the transmission conversion channel, the power switching component is installed in the transmission conversion channel, and the cutting mechanism is installed on the power switching component; the resistance component is used to pre-contact the formed concrete when the base plate moves vertically downward, thereby driving the power switching component to move in the transmission conversion channel, and the power switching component is used to drive the cutting mechanism to operate and drive the cutting mechanism to move vertically downward during the displacement in the transmission conversion channel.

[0022] By adopting the above technical solution, after the base plate moves downward, the resistance component will pre-contact the formed concrete. Here, the resistance component will drive the power switching component to displace in the transmission conversion channel during the process of resisting the concrete. The power switching component in displacement can drive the cutting mechanism to operate and move the cutting mechanism vertically downward, so that when the base plate moves vertically downward and approaches the prestressed steel bars, the cutting mechanism will automatically operate and also approach the prestressed steel bars.

[0023] Optionally, the transmission conversion channel includes a transverse channel and a vertical channel, the transverse channel is horizontally arranged on the side of the bottom plate, the vertical channel is connected to the end of the transverse channel away from the bottom plate and extends vertically downward, the transverse channel is open at one end close to the vertical channel, and both ends of the vertical channel are open;

[0024] The power switching assembly includes a horizontal sliding plate, a vertical pushed plate, a first spring, a first conductive plate, a second conductive plate, and a battery; the horizontal sliding plate is slidably arranged in the transverse channel, the vertical pushed plate is slidably arranged in the vertical channel, the first spring is arranged in the vertical channel and always has a tendency to push the vertical pushed plate vertically upward, the elastic pushing force of the first spring is greater than the sum of the gravity of the vertical pushed plate and the weight of the cutting mechanism, the first conductive plate is covered on the upper plate surface of the horizontal sliding plate and is electrically connected to the cutting mechanism, the second conductive plate is arranged above the port of the transverse channel away from the bottom plate, and the battery is mounted on the bottom plate and electrically connected to the second conductive plate;

[0025] The interference assembly includes an interference plate and a vertical push plate. The interior of the bottom plate is hollow and the lower end is open. The interference plate is vertically slidably arranged in the bottom plate. A connecting port is opened on the bottom plate for connecting the interior of the bottom plate with the interior of the transverse channel. A through-opening is opened on the upper wall of the bottom plate. The vertical push plate and the through-opening are vertically opposite to each other.

[0026] An inclined pushing surface is provided at the upper end of the vertical pushing plate, and a first inclined pushing surface is provided at one end of the horizontal pushing plate close to the vertical pushing plate, and the first inclined pushing surface slides in contact with the inclined pushing surface; a second inclined pushing surface is provided at one end of the horizontal pushing plate close to the vertical channel, and an inclined pushed surface is provided at the upper end of the vertical pushed plate, and the second inclined pushing surface slides in contact with the inclined pushed surface; after the end of the horizontal pushing plate away from the bottom plate passes through the port of the horizontal channel, the first conductive plate is in contact with the second conductive plate.

[0027] By adopting the above technical solution, when the bottom plate moves vertically downward, the resistance plate inside the bottom plate will be pre-attached to the formed concrete surface. As the bottom plate continues to move downward, the resistance plate will be blocked by the formed concrete surface and will move upward inside the bottom plate, thereby pushing the vertical push plate to move from bottom to top, allowing the inclined push surface to abut against the first inclined push surface, and continue to move to push the entire horizontal push plate to one side. At this time, the upper end of the vertical push plate will pass through the through-hole, so that the vertical push plate occupies part of the position of the horizontal push plate in the horizontal channel; at this time, let the horizontal push plate One end of the plate with the second inclined sliding surface passes through one end port of the transverse channel, and pushes the end of the vertical pushed plate with the inclined pushed surface vertically downward, thereby allowing the cutting mechanism to move vertically downward and approach the prestressed steel bar; and as the end of the horizontal sliding plate with the second inclined sliding surface passes through one end port of the transverse channel, the first conductive plate and the second conductive plate are fitted together, and the power of the battery will be supplied to the cutting mechanism, allowing the cutting mechanism to operate and then cut the prestressed steel bar, ultimately achieving the effect of allowing the cutting mechanism to automatically approach the prestressed steel bar and automatically cut it.

[0028] Optionally, the lower opening edge of the bottom plate is provided with an anti-slip convex edge, and the upper edge of the contact plate is provided with a contact convex edge, and the anti-slip convex edge and the contact convex edge are opposite to each other in the vertical direction.

[0029] By adopting the above technical solution, the provision of the anti-slip convex edge and the resisting convex edge can allow the resisting plate to slide vertically stably in the bottom plate without being easily separated.

[0030] Optionally, the cutting mechanism includes a grinding wheel cutter, and multiple grinding wheel cutters are horizontally arranged along the length direction of the vertical pushed plate. Multiple vertical strip holes are opened on the side wall of the vertical channel, and the vertical strip holes are used for the cutting end of the grinding wheel cutter to pass through the vertical channel.

[0031] By adopting the above technical solution, the arrangement of the vertical strip holes can allow the abrasive cutter to stably move along with the vertical pushed plate, so that the cutting end of the abrasive cutter can normally cut the prestressed steel bars.

[0032] Optionally, the surfaces of the inclined pushing surface, the first inclined sliding surface, the second inclined sliding surface and the inclined pushed surface are all covered with polytetrafluoroethylene.

[0033] By adopting the above technical solution, polytetrafluoroethylene has the characteristics of high temperature resistance and its friction coefficient is extremely low, so in addition to being able to act as a lubricant, after being coated with polytetrafluoroethylene, the surfaces of the inclined pushing surface, the first inclined pushing surface, the second inclined pushing surface and the inclined pushed surface can be made smoother, thereby facilitating pushing.

[0034] Optionally, adjustable brackets are provided on all four sides of the cover.

[0035] By adopting the above technical solution, the provision of the adjustable bracket can facilitate adaptive adjustment of the vertical height of the cover.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. During the tensioning process of the steel bars, the telescopic protective cover can adaptively expand and contract as the hydraulic jack extends, that is, it can always cover the prestressed steel bar segment between the movable crossbeam and the fixed crossbeam, thereby covering the prestressed steel bar segment during the tensioning process. When the prestressed steel bar segment suddenly breaks, it can isolate the prestressed steel bar segment from the outside world, preventing the broken prestressed steel bar segment from injuring nearby workers; when the prestressed steel bars are cut, the cover can cover the formed concrete blocks and part of the prestressed steel bar beam, and the cutting mechanism can automatically cut the prestressed steel bar in the process of approaching the prestressed steel bar under the drive of the trigger starting mechanism, without the need for workers to actively approach the prestressed steel bar segment, thereby reducing the labor intensity of workers and, to a certain extent, avoiding the situation where workers are close to the prestressed steel bar and are hit by the breaking of the prestressed steel bar;

[0038] When the bottom plate moves downward vertically, the resistance plate in the bottom plate will be pre-fitted to the formed concrete surface. As the bottom plate continues to move downward, the resistance plate will be blocked by the formed concrete surface and will move upward in the bottom plate, thereby pushing the vertical pushing plate from bottom to top through the connecting port into the transverse channel, so that the inclined pushing surface abuts the first inclined pushing surface, and continues to move to push the entire horizontal pushing plate to one side, so that the vertical pushing plate occupies part of the position of the horizontal pushing plate in the transverse channel; at this time, the end of the horizontal pushing plate provided with the second inclined pushing surface is passed through one end port of the transverse channel, and the end of the vertical pushed plate with the inclined pushed surface is pushed vertically downward, thereby allowing the cutting mechanism to move vertically downward and approach the prestressed steel bar; and as the end of the horizontal pushing plate provided with the second inclined pushing surface passes through one end port of the transverse channel, the first conductive plate and the second conductive plate are fitted together, and the electric energy of the battery will be supplied to the cutting mechanism, allowing the cutting mechanism to operate and then cut the prestressed steel bar, and finally achieving the effect of allowing the cutting mechanism to automatically approach the prestressed steel bar and automatically cut;

[0039] 3. After the fixed cover is detachably connected to the ground, only the movable cover will move with the movement of the movable crossbeam. At this time, the telescopic protective cover can be normally expanded or contracted, so that the prestressed steel bars can always be covered during the process of tensioning the prestressed steel bars. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the construction structure of an embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the construction structure after the telescopic protective cover is installed in an embodiment of the present application;

[0042] Figure 3 This is a schematic structural diagram of a telescopic protective cover according to an embodiment of the present application;

[0043] Figure 4 This is a partial cross-sectional view of an embodiment of the present application for illustrating a steel bar cutting device;

[0044] Figure 5 yes Figure 4 Enlarged view of part A in .

[0045] In the figure, 1. pedestal; 2. hydraulic jack; 3. fixed crossbeam; 4. movable crossbeam; 5. telescopic protective cover; 51. fixed cover body; 511. sliding groove; 52. movable cover body; 521. sliding bar; 6. steel bar cutting device; 7. cover; 71. adjustable bracket; 8. lifting mechanism; 81. cylinder; 82. bottom plate; 821. connecting port; 822. anti-slip convex edge; 823. through-hole; 9. trigger start mechanism; 91. transmission conversion channel; 911. transverse channel; 912. Vertical channel; 9121. Vertical bar hole; 92. Interference assembly; 921. Interference plate; 9211. Interference convex edge; 922. Vertical push plate; 9221. Inclined push surface; 93. Power switching assembly; 931. Horizontal push plate; 9311. First inclined push surface; 9312. Second inclined push surface; 932. Vertical pushed plate; 9321. Inclined pushed surface; 933. First spring; 934. First conductive plate; 935. Second conductive plate; 936. Battery; 10. Cutting mechanism; 101. Abrasive cutter. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1 -Attached Figure 5 , further details of this application are given.

[0047] A construction technology of prestressed concrete I-beam with broken line, referring to Figure 1 、 2 , including the following steps:

[0048] Preparation steps before tensioning: Place the pedestal 1, hydraulic jack 2, fixed beam 3 and movable beam 4 in the designated positions. The pedestal 1 is installed between the two fixed beams 3, with the length direction of the pedestal 1 perpendicular to the length direction of the fixed beams 3. The movable beam 4 is placed on one side of one of the fixed beams 3, with the length direction of the movable beam 4 parallel to the length direction of the fixed beams 3. Multiple holes are opened on both the fixed beams 3 and the movable beams 4.

[0049] Steps for laying prestressed steel bars: Put the clamp on the prestressed steel bars, and insert the prestressed steel bars one by one through the hole of the movable crossbeam 4 and out of the hole of the fixed crossbeam 3 on the other side. Then, lock the clamp with a tool so that the two ends of the prestressed steel bars are fixed between the fixed crossbeam 3 and the movable crossbeam 4 respectively;

[0050] The protective steps before steel bar tensioning: a telescopic protective cover 5 is set between the fixed crossbeam 3 and the movable crossbeam 4, and the telescopic protective cover 5 can adaptively expand and contract as the positions of the fixed crossbeam 3 and the movable crossbeam 4 change, so that the prestressed steel bar section between the fixed crossbeam 3 and the movable crossbeam 4 is always in the telescopic protective cover 5; the telescopic protective cover 5 includes a fixed cover body 51 and a movable cover body 52, the fixed cover body 51 is detachably connected to the ground, that is, the end of the fixed cover body 51 close to the ground is provided with a floor, and a plurality of anchor bolts are passed through the floor, and the floor is fastened to the current ground by the anchor bolts; the movable cover body 52 is detachably connected to the movable crossbeam 4, that is, a flange is provided at one end of the movable cover body 52, the flange is fitted on the movable crossbeam 4, and a tightening bolt is threadedly passed between the flange and the movable crossbeam 4, and the movable cover body 52 is slidably set on the fixed cover body 51; combined with Figure 3 A sliding bar 521 is provided on the side wall of the movable cover 52 along the length direction of the prestressed steel bar, and a sliding groove 511 is provided on the inner side wall of the fixed cover 51. The sliding bar 521 is slidably provided in the sliding groove 511. The cross-sectional shape of the sliding bar 521 and the sliding groove 511 are both rectangular. In other embodiments, they may also be T-shaped or dovetail-shaped.

[0051] Steel bar tensioning steps: Use hydraulic jack 2 to tension prestressed steel bars. Hydraulic jack 2 is installed on fixed beam 3. One end of the piston rod of hydraulic jack 2 abuts against movable beam 4. Let the piston rod of hydraulic jack 2 extend.

[0052] Concrete beam forming steps: tying non-prestressed steel bars to the prestressed steel bars between the pedestals 1, supporting a prestressed concrete formwork on the non-prestressed steel bars, and pouring concrete in the concrete formwork;

[0053] Preparation steps for cutting steel bars: a steel bar cutting device 6 is installed on the pedestal 1 directly above the concrete formwork. The steel bar cutting device 6 includes a cover 7, a lifting mechanism 8, a triggering and starting mechanism 9, and a cutting mechanism 10. The cover 7 is used to shield the prestressed steel bars between the pedestals 1. The lifting mechanism 8 is installed on the cover 7, the triggering and starting mechanism 9 is installed on the lifting mechanism 8, and the cutting mechanism 10 is installed on the triggering and starting mechanism 9. The lifting mechanism 8 is used to drive the cutting mechanism 10 to move vertically in the cover 7. The triggering and starting mechanism 9 is used to automatically start the cutting mechanism 10 when the lifting mechanism 8 descends, thereby cutting the prestressed steel bars between the pedestals 1, and automatically shut down the cutting mechanism 10 and move away from the prestressed steel bars when the lifting mechanism 8 ascends.

[0054] Post-tensioning step: After the concrete is formed, the concrete formwork is removed, and then the prestressed steel bars between the pedestals 1 are cut by the steel bar cutting device 6, and the covering cover 7 is used to shield them during cutting.

[0055] Combine Figure 1 、 2 Adjustable brackets 71 are installed around the cover 7, and the adjustable brackets 71 can be telescopically adjusted in the vertical direction, that is, the position of the cover 7 in the vertical direction can be adaptively adjusted through the adjustable brackets 71, so that the cover 7 can cover the shaped concrete blocks and part of the prestressed steel bar segments between the two fixed beams 3. The adjustable brackets 71 are existing products that are commonly available on the market, and their specific structure will not be described here.

[0056] Reference Figure 4 The lifting mechanism 8 includes a cylinder 81 and a base plate 82. A plurality of cylinders 81 are provided on the top of the cover 7. The plurality of cylinders 81 operate synchronously. The cylinder body of the cylinder 81 is vertically installed on the top of the cover 7, and the piston rod of the cylinder 81 extends vertically downward to the inside of the cover 7. The end of the piston rod of the cylinder 81 is connected to the upper plate surface of the base plate 82 by bolts. The position of the base plate 82 is directly above the formed concrete; the trigger starting mechanism 9 is installed on the base plate 82. The trigger starting mechanism 9 is used to drive the cutting mechanism 10 to move downward and operate synchronously when the base plate 82 contacts the formed concrete and continues to move downward.

[0057] Start the cylinder 81 so that the piston rod of the cylinder 81 extends vertically downward, which can drive the bottom plate 82 to extend vertically downward and approach the formed concrete, and then the cutting mechanism 10 can be brought close to the prestressed steel bars, so as to achieve the effect of automatically starting the cutting mechanism 10 to cut the prestressed steel bars after the cutting mechanism 10 approaches the prestressed steel bars.

[0058] Combine Figure 4 、 5Specifically, the trigger starting mechanism 9 includes a transmission conversion channel 91, a resistance component 92 and a power switching component 93; the transmission conversion channel 91 is provided with one on each side of the base plate 82, the resistance component 92 is installed between the base plate 82 and the transmission conversion channel 91, the power switching component 93 is installed in the transmission conversion channel 91, and the cutting mechanism 10 is installed on the power switching component 93; the resistance component 92 is used to pre-contact the formed concrete when the base plate 82 moves vertically downward, thereby driving the power switching component 93 to move in the transmission conversion channel 91, and the power switching component 93 is used to drive the cutting mechanism 10 to operate and drive the cutting mechanism 10 to move vertically downward during the displacement process in the transmission conversion channel 91.

[0059] After the bottom plate 82 moves downward, the resistance component 92 will contact the formed concrete in advance. Here, the resistance component 92 will drive the power switching component 93 to move in the transmission conversion channel 91 during the process of resisting the concrete. The displacing power switching component 93 can drive the cutting mechanism 10 to operate and move the cutting mechanism 10 vertically downward, so that when the bottom plate 82 moves vertically downward and approaches the prestressed steel bars, the cutting mechanism 10 will automatically run and also approach the prestressed steel bars.

[0060] like Figure 4 、 5 As shown, the transmission conversion channel 91 includes a transverse channel 911 and a vertical channel 912. The transverse channel 911 is connected to the interior of the vertical channel 912, and when viewed from the front, the cross-section formed by the transverse channel 911 and the vertical channel 912 is in an inverted L shape; the transverse channel 911 is horizontally installed on the upper surface of the bottom plate 82 near the side, and one end of the transverse channel 911 extends horizontally to the outside of the bottom plate 82; the vertical channel 912 is installed on the lower side of the end of the transverse channel 911 away from the bottom plate 82, and the vertical channel 912 is vertically arranged; in this embodiment, the transverse channel 911 is connected to the bottom plate 82. Figure 5 Taking the transmission conversion channel 91 on the left as an example, the left end of the horizontal channel 911 is open, the upper and lower ends of the vertical channel 912 are both open, and the upper wall of the horizontal channel 911 near the opening at the left end of the horizontal channel 911 is also open (the opening here is on the same vertical line as the upper end of the vertical channel 912); a through opening 823 is provided on the upper wall surface of the bottom plate near the right end wall of the horizontal channel 911, and a connecting opening 821 is provided on the side wall surface. The connecting opening 821 connects the horizontal channel 911 with the interior of the bottom plate 82.

[0061] Combine Figure 4 、 5The power switching assembly 93 includes a horizontal push plate 931, a vertical pushed plate 932, a first spring 933, a first conductive plate 934, a second conductive plate 935 and a battery 936; the horizontal push plate 931 is slidably inserted in the horizontal channel 911, and a second inclined push surface 9312 is provided at one end of the horizontal push plate 931 close to the vertical channel 912, and the surface of the second inclined push surface 9312 is inclined downward toward the vertical channel 912; the horizontal push plate 931 is provided at one end close to the bottom plate 82 with a second inclined push surface 9312, and the surface of the second inclined push surface 9312 is inclined downward toward the vertical channel 912. The top of the vertical channel 912 is tilted downward toward the connecting port 821; the vertical pushed plate 932 is slidably inserted in the vertical channel 912, and the upper end of the vertical pushed plate 932 is provided with an inclined pushed surface 9321, the inclined pushed surface 9321 and the second inclined sliding surface 9312 have the same inclination angle, and in the natural state, the inclined pushed surface 9321 and the first inclined pushed surface 9321 are in a fit state; protruding channels communicating with the interior of the vertical channel 912 are provided on the two end walls of the vertical channel 912, and extension plates are provided on the side walls of the vertical pushed plate 932, which extend into the protruding channel, and the first elastic One end of the spring 933 is connected to the lower end wall of the protruding channel, and the other end is connected to the plate surface of the extension plate. The first spring 933 always has a tendency to push the vertically pushed plate 932 vertically upward, and the elastic pushing force of the first spring 933 is greater than the sum of the gravity of the vertically pushed plate 932 and the weight of the cutting mechanism 10; similarly, a protruding channel connected to the interior of the transverse channel 911 is also provided on the upper end wall of the transverse channel 911, and an extension plate is also provided on the side of the horizontal push plate 931, which extends into the protruding channel on the transverse channel 911. A second spring is provided between the extension plate 931 and the protruding channel, and the second spring makes the horizontal push plate 931 always have a tendency to move horizontally toward the side close to the bottom plate 82; the first conductive plate 934 is covered on the upper plate surface of the horizontal push plate 931 and is electrically connected to the cutting mechanism 10, and the second conductive plate 935 is horizontally arranged above the port of the transverse channel 911 away from the bottom plate 82, and the battery 936 is installed on the bottom plate 82 and is electrically connected to the second conductive plate 935, that is, as long as the first conductive plate 934 extends out of the port of the transverse channel 911, it can be in a fit state with the second conductive plate 935.

[0062] Combine Figure 4 、 5The resistance component 92 includes a resistance plate 921 and a vertical push plate 922; the interior of the bottom plate 82 is hollow and the lower end is open, and an anti-slip convex edge 822 is provided on the circumferential edge of the lower end opening of the bottom plate 82. The resistance plate 921 is vertically slidably set in the bottom plate 82, and a resistance convex edge 9211 is provided on the upper end edge of the resistance plate 921. The resistance convex edge 9211 is used to interfere with the anti-slip convex edge 822 to prevent the resistance plate 921 from detaching from the bottom plate 82. The vertical push plate 922 is vertically arranged on the upper plate surface of the resistance plate 921, and an inclined push surface 9221 is arranged at the upper end of the vertical push plate 922. The inclination angle of the inclined push surface 9221 is consistent with the inclination angle of the first inclined sliding surface 9311, and the inclined push surface 9221 and the first inclined sliding surface 9311 are in contact with each other in a natural state. The upper end of the vertical push plate 922 is vertically opposite to the through-opening 823.

[0063] Combine Figure 4 、 5 The cutting mechanism 10 includes an abrasive cutter 101, and a plurality of abrasive cutters 101 are horizontally arranged along the length direction of the vertical pushed plate 932. A plurality of vertical strip holes 9121 are opened on the side wall of the vertical channel 912, and the vertical strip holes 9121 are used for the cutting end of the abrasive cutter 101 to pass through the vertical channel 912; the first conductive plate 934 is electrically connected to the abrasive cutter 101 through a spring wire; in order to protect the abrasive cutter 101 when idle, a transparent protective cover is provided on the outer wall of the vertical channel 912 and above the top of the vertical strip holes 9121. The transparent protective cover can provide preliminary protection for the abrasive cutter 101 and prevent staff from accidentally touching it.

[0064] When the bottom plate 82 moves vertically downward, the contact plate 921 inside the bottom plate 82 will be pre-attached to the formed concrete surface. As the bottom plate 82 continues to move downward, the contact plate 921 is blocked by the formed concrete surface and moves upward inside the bottom plate 82, thereby pushing the vertical push plate 922 to move from bottom to top, so that the inclined push surface 9221 abuts against the first inclined push surface 9311, and continues to move until it passes through the through hole 823 and pushes the entire horizontal push plate 931 to one side, so that the vertical push plate 922 occupies part of the position of the horizontal push plate 931 in the horizontal channel 911; at this time, the horizontal push plate 931 is provided with a second inclined push surface 9312 One end of the horizontal push plate 931 passes through one end port of the transverse channel 911, and pushes the end of the vertical pushed plate 932 with the inclined pushed surface 9321 vertically downward, thereby allowing the abrasive cutter 101 to move vertically downward and approach the prestressed steel bar; and as the end of the horizontal push plate 931 with the second inclined push surface 9312 passes through one end port of the transverse channel 911, the first conductive plate 934 and the second conductive plate 935 are fitted together, and the electric energy of the battery 936 will be supplied to the abrasive cutter 101, allowing the abrasive cutter 101 to start running and then cut the prestressed steel bar, ultimately achieving the effect of allowing the abrasive cutter 101 to automatically approach the prestressed steel bar and automatically cut it.

[0065] The implementation principle of the embodiment of the present application is as follows: first, adjust the adjustable bracket 71 so that the cover 7 is above the formed concrete and the bottom plate 82 is directly above the formed concrete, then start the cylinder 81, let the piston rod of the cylinder 81 extend vertically downward, and drive the bottom plate 82 to gradually approach the formed concrete surface; at this time, the resistance plate 921 inside the bottom plate 82 will contact the formed concrete in advance, and will be pressed by the formed concrete and move upward inside the bottom plate 82, at this time, the vertical push plate 922 will push the horizontal push plate 931 to move, and the horizontal push plate 931 will push the vertical pushed plate 932 to move, and finally convert it into the vertical downward movement of the abrasive cutter 101, at this time the abrasive cutter 101 will When the first conductive plate 934 and the second conductive plate 935 are in contact with each other, the power is turned on and the prestressed steel bars on both sides of the formed concrete are cut normally at the same time. After the cutting is completed, the bottom plate 82 is lifted by the cylinder 81, and the resistance plate 921 moves downward in the bottom plate 82 under the action of gravity. The vertical pushing plate 922 no longer pushes the horizontal pushing plate 931. The horizontal pushing plate 931 returns to its original position under the rebound action of the second spring, and the vertical pushed plate 932 moves vertically upward under the rebound action of the first spring 933, thereby driving the abrasive wheel cutter 101 to move vertically upward. At this time, the first conductive plate 934 and the second conductive plate 935 are separated, and the abrasive wheel cutter 101 is automatically turned off, thereby realizing the function of automatically resetting and shutting down the running equipment.

[0066] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A construction process for a folded line prestressed concrete I-beam, characterized in that: The following steps are involved: Preparatory steps before tensioning: placing the pedestal (1), hydraulic jack (2), fixed beam (3) and movable beam (4) in designated positions; The steps of laying prestressed steel bars are as follows: a clamp is put on the prestressed steel bars, and the prestressed steel bars are passed through the hole of the movable crossbeam (4) one by one, and passed out from the hole of the fixed crossbeam (3) on the other side, and then the clamp is locked by a tool so that the two ends of the prestressed steel bars are respectively fixed between the fixed crossbeam (3) and the movable crossbeam (4); The steel bar pre-tensioning protection step includes: arranging a telescopic protective cover (5) between the fixed crossbeam (3) and the movable crossbeam (4); the telescopic protective cover (5) can adaptively expand and contract as the positions of the fixed crossbeam (3) and the movable crossbeam (4) change, so that the prestressed steel bar section between the fixed crossbeam (3) and the movable crossbeam (4) is always within the telescopic protective cover (5); Steel bar tensioning steps: using a hydraulic jack (2) to tension the prestressed steel bar, the hydraulic jack (2) is installed on the fixed beam (3), one end of the piston rod of the hydraulic jack (2) is abutted against the movable beam (4), and the piston rod of the hydraulic jack (2) is extended; The concrete I-beam forming steps include: tying non-prestressed steel bars to the prestressed steel bars between the pedestals (1), supporting a concrete formwork on the non-prestressed steel bars, and pouring concrete in the concrete formwork; Preparation steps for cutting steel bars: a steel bar cutting device (6) is installed on the pedestal (1) directly above the concrete formwork, the steel bar cutting device (6) comprising a cover (7), a lifting mechanism (8), a triggering and starting mechanism (9) and a cutting mechanism (10); the cover (7) is used to shield the prestressed steel bars between the pedestals (1); the lifting mechanism (8) is installed on the cover (7), the triggering and starting mechanism (9) is installed on the lifting mechanism (8), and the cutting mechanism (10) is installed on the triggering and starting mechanism (9); the lifting mechanism (8) is used to drive the cutting mechanism (10) to move in the vertical direction inside the cover (7); the triggering and starting mechanism (9) is used to automatically start the cutting mechanism (10) when the lifting mechanism (8) descends to approach the prestressed steel bars so as to cut the prestressed steel bars between the pedestals (1), and automatically close the cutting mechanism (10) when the lifting mechanism (8) ascends and moves away from the prestressed steel bars; Laying down step: After the concrete is formed, the concrete formwork is removed, and then the prestressed steel bars between the pedestals (1) are cut by the steel bar cutting device (6), and the covering cover (7) is used to shield the cutting process; The lifting mechanism (8) includes a cylinder (81) and a bottom plate (82), wherein the cylinder (81) is vertically mounted on the cover (7), and the piston rod of the cylinder (81) extends vertically downward after passing through the top wall of the cover (7), and the bottom plate (82) is horizontally mounted on the end of the piston rod of the cylinder (81), and the triggering and starting mechanism (9) is mounted on the bottom plate (82); after the bottom plate (82) contacts the formed concrete and continues to move downward, the triggering and starting mechanism (9) drives the cutting mechanism (10) to operate; The trigger start mechanism (9) comprises a transmission conversion channel (91), a resistance component (92) and a power switching component (93); the transmission conversion channel (91) is provided with one on each side of the base plate (82); the resistance component (92) is installed between the base plate (82) and the transmission conversion channel (91); the power switching component (93) is installed in the transmission conversion channel (91); and the cutting mechanism (10) is installed on the power switching component (93); the resistance component (92) is used to pre-contact the formed concrete when the base plate (82) moves vertically downward, thereby driving the power switching component (93) to move in the transmission conversion channel (91); the power switching component (93) is used to drive the cutting mechanism (10) to operate and drive the cutting mechanism (10) to move vertically downward during the displacement in the transmission conversion channel (91).

2. A fold line prestressed concrete I-beam construction process according to claim 1, characterized in that: The telescopic protective cover (5) comprises a fixed cover body (51) and a movable cover body (52), wherein the fixed cover body (51) is detachably connected to the ground, the movable cover body (52) is detachably connected to the movable crossbeam (4), and the movable cover body (52) is slidably arranged on the fixed cover body (51).

3. The construction process of a broken line pre-tensioned prestressed concrete I-beam according to claim 2, characterized in that: A sliding bar (521) is provided on the side wall of the movable cover body (52) along the length direction of the prestressed steel bar, and a sliding groove (511) is provided on the inner side wall of the fixed cover body (51), and the sliding bar (521) is slidably provided in the sliding groove (511).

4. The construction process of a broken line prestressed concrete I-beam according to claim 1, characterized in that: The transmission conversion channel (91) includes a transverse channel (911) and a vertical channel (912), wherein the transverse channel (911) is horizontally arranged on the side of the bottom plate (82), and the vertical channel (912) is arranged to communicate with one end of the transverse channel (911) away from the bottom plate (82) and extends vertically downward, and the transverse channel (911) is opened at one end close to the vertical channel (912), and both ends of the vertical channel (912) are opened; The power switching assembly (93) includes a horizontal push plate (931), a vertical pushed plate (932), a first spring (933), a first conductive plate (934), a second conductive plate (935) and a battery (936); the horizontal push plate (931) is slidably arranged in the transverse channel (911), the vertical pushed plate (932) is slidably arranged in the vertical channel (912), the first spring (933) is arranged in the vertical channel (912) and always has the function of moving the vertical pushed plate (932) The first spring (933) has a tendency to push vertically upward, the elastic pushing force of the first spring (933) is greater than the sum of the gravity of the vertically pushed plate (932) and the weight of the cutting mechanism (10), the first conductive plate (934) is covered on the upper plate surface of the horizontal push plate (931) and is electrically connected to the cutting mechanism (10), the second conductive plate (935) is arranged above the port of the transverse channel (911) away from the bottom plate (82), and the battery (936) is installed on the bottom plate (82) and is electrically connected to the second conductive plate (935); The resisting assembly (92) includes a resisting plate (921) and a vertical pushing plate (922). The interior of the bottom plate (82) is hollow and the lower end is open. The resisting plate (921) is vertically slidably arranged in the bottom plate (82). The bottom plate (82) is provided with a connecting port (821) for connecting the interior of the bottom plate (82) with the interior of the transverse channel (911). A through port (823) is provided on the upper wall of the bottom plate (82). The vertical pushing plate (922) and the through port (823) are opposite to each other in the vertical direction. The upper end of the vertical pushing plate (922) is provided with an inclined pushing surface (9221), and the end of the horizontal pushing plate (931) close to the vertical pushing plate (922) is provided with a first inclined pushing surface (9311), and the first inclined pushing surface (9311) is in sliding contact with the inclined pushing surface (9221); the end of the horizontal pushing plate (931) close to the vertical channel (912) is provided with a second inclined pushing surface (9312), and the upper end of the vertical pushed plate (932) is provided with an inclined pushed surface (9321), and the second inclined pushing surface (9312) is in sliding contact with the inclined pushed surface (9321); after the end of the horizontal pushing plate (931) away from the bottom plate (82) passes through the port of the horizontal channel (911), the first conductive plate (934) is in contact with the second conductive plate (935).

5. The construction process of a folded-line prestressed concrete I-beam according to claim 4, characterized in that: The lower opening edge of the bottom plate (82) is provided with an anti-slip convex edge (822), and the upper edge of the contact plate (921) is provided with a contact convex edge (9211), and the anti-slip convex edge (822) and the contact convex edge (9211) are opposite to each other in the vertical direction.

6. The construction process of a folded-line prestressed concrete I-beam according to claim 4, characterized in that: The cutting mechanism (10) comprises a grinding wheel cutter (101), wherein a plurality of the grinding wheel cutters (101) are arranged horizontally along the length direction of the vertically pushed plate (932), and a plurality of vertical strip holes (9121) are provided on the side wall of the vertical channel (912), wherein the cutting end of the grinding wheel cutter (101) passes through the vertical channel (912).

7. The construction process of a folded-line prestressed concrete I-beam according to claim 4, characterized in that: The surfaces of the inclined pushing surface (9221), the first inclined sliding surface (9311), the second inclined sliding surface (9312), and the inclined pushed surface (9321) are all covered with polytetrafluoroethylene.

8. The construction process of a folded-line prestressed concrete I-beam according to claim 1, characterized in that: Adjustable brackets (71) are provided on all four sides of the covering cover (7).

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