Pretensioned I-beam intelligent tensioning pedestal and its construction method

Abstract

The present invention discloses a pre-tensioning method for an I-beam intelligent tensioning pedestal and its construction method. By the combined use of a first deflector and a second deflector, the adjustment of different prestressed cable angles and the simultaneous production of multiple beams are realized. Finally, by setting up a tensioning device, the combination of a magnetic flux sensor, a stress and strain sensor, a rangefinder, an intelligent jack and a controller ensures the safety and quality of tensioning in real time during the tensioning process, realizes the dual control of stress and displacement during the tensioning process, and realizes the intelligent control of the tensioning process. The present invention solves the problem that the existing beam-making pedestal for pre-tensioning I-beams has high requirements for its bottom foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly to an intelligent tensioning pedestal for pretensioned I-beams and a construction method thereof. Background Art

[0002] Pretensioning construction means that before pouring a concrete member, the prestressing tendon is tensioned and temporarily anchored on the beam-making pedestal, and then the concrete member is poured. When the concrete reaches a certain strength and there is sufficient bond between the prestressing tendon and the concrete, the prestress is released. The prestressing tendon elastically retracts, and by virtue of the bond between the concrete and the prestressing tendon, a precompressive stress is generated on the concrete. Pretensioning can eliminate procedures such as reserving ducts and grouting, and the prestress is evenly distributed, and the durability of the beam body is good.

[0003] Pretensioned beams have the advantages of simple construction, short manufacturing cycle, material saving, and convenient factory prefabrication. They can also eliminate anchorages, corrugated pipes, etc. in post-tensioning, avoid problems such as insufficient grouting volume and blockage of grouting holes in post-tensioning, which affect the structural bearing capacity and durability, and save expensive anchorages.

[0004] In view of the above advantages of pretensioning, pretensioned I-beams have been widely used in bridge engineering in recent years. However, pretensioning construction also has some inevitable problems and defects. The production of pretensioned I-beams generally requires equipment such as tensioning pedestals, reaction walls, jacks, and clamps. Among them, the tensioning pedestal is the most important equipment for the production of pretensioned I-beams. Due to the large weight of the precast beam, the bearing capacity requirement of the foundation at the bottom of the tensioning pedestal is high, and a large amount of cost is required for the foundation treatment of the bottom of the beam-making pedestal. Secondly, the pedestal of the pretensioned I-beam is mostly suitable for the tensioning production of straight prestressing tendons, and its applicability to non-linear and broken-line prestressing tendons is poor. In addition, since the prestress applied to the pretensioned I-beam is large, and all of this prestress is borne by the tensioning pedestal before tension release, the size of the tensioning pedestal for the pretensioned I-beam is large, and the workload of removing the pedestal after the I-beam is manufactured is large, resulting in a reduction in construction efficiency and an increase in construction cost.

[0005] The information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] In order to overcome the defects existing in the prior art, there is provided an intelligent tensioning pedestal for pretensioned I-beams and a construction method thereof to solve the problem that the existing beam-making pedestal for pretensioned I-beams has high requirements for the foundation at its bottom.

[0007] To achieve the above object, a smart tensioning pedestal for pretensioned I-beams is provided. The prestressing cables of the pretensioned I-beams include straight cables and bent cables. The smart tensioning pedestal for pretensioned I-beams is characterized in that it comprises:

[0008] A table board laid on the foundation. A first deflector through which the middle part of the bent cable passes is adjustably installed at the middle position of the table board. Second deflectors through which the two ends of the bent cable pass are respectively installed at the two ends of the table board;

[0009] Two support frames installed at the opposite ends of the table board. The support frame comprises an anchoring member vertically arranged on multiple foundations and fitting against the end of the table board, a support member arranged in the same direction as the table board, and a steel belt. One end of the support member is supported on the side of the anchoring member away from the table board. Multiple anti-pulling piles are buried in the foundation. The steel belt is tied between the other end of the support member and the upper part of the anchoring member. Multiple anti-pulling piles are buried in the foundation along the length direction of the table board. The anchoring member, the support member, and the middle part of the table board are respectively connected to the anti-pulling piles. Through holes are respectively formed in the upper and lower parts of the anchoring member, and force-transferring steel bars are movably inserted into the through holes;

[0010] A tensioning device, which includes an upper anchor beam, a lower anchor beam, a magnetic flux sensor installed on the prestressing cable, a stress-strain sensor installed on the steel belt, a rangefinder for collecting the displacements of the upper anchor beam and the lower anchor beam, a tensioning jack, and a controller. The upper anchor beam is installed at the end of the bent cable and connected to one end of the force-transferring steel bar in the through hole in the upper part of the anchoring member. The lower anchor beam is installed at the end of the straight cable and connected to one end of the force-transferring steel bar in the through hole in the lower part of the anchoring member. The tensioning jack is installed on the side of the anchoring member away from the table board and connected to the other end of the force-transferring steel bar. The controller is connected to the magnetic flux sensor, the stress-strain sensor, the rangefinder, and the tensioning jack.

[0011] Further, each anti-pulling pile includes two steel pipe piles arranged side by side, and the two steel pipe piles support the opposite sides of the anchoring member, the support member, and the table board.

[0012] Further, the first deflector is adjustably installed on the table board through an adjusting bracket. The adjusting bracket comprises:

[0013] A base plate laid on the table board. Ear plates extending downward are formed at the opposite ends of the base plate, and the ear plates are connected to the two steel pipe piles of one anti-pulling pile;

[0014] Two side plates are oppositely arranged and vertically provided on the base plate. Clamping members are respectively installed on the opposite sides of the two side plates. A support rod is clamped between the two clamping members. The support rod is arranged at an angle with the table plate. The first steering device is installed at the upper end of the support rod. The lower end of the support rod extends below the two clamping members. A pressing member is installed at the lower end of the support rod. A wedge block is interposed between the pressing member and the clamping member.

[0015] Further, the support rod is a screw rod. A threaded hole is formed in the pressing member, and the pressing member is screwed to the lower end of the support rod.

[0016] Further, the first steering device is coaxially arranged with the support rod. On the opposite sides of the first steering device, a plurality of reaction force pressing rods are respectively connected at intervals along the length direction of the first steering device. The middle part of the folding cable passes through between two adjacent reaction force pressing rods.

[0017] Further, the lower part of the anchoring member slides on the upper end of an uplift resistance pile.

[0018] Further, one end of the support member is placed on the upper end of an uplift resistance pile. A pressing beam is arranged at one end of the support member. The two ends of the pressing beam are respectively tied to the upper end of the uplift resistance pile through tie rods.

[0019] Further, a plurality of through holes are formed inside the second steering device. A fixed shaft is detachably installed in the through holes. A steering wheel is rotatably sleeved on the fixed shaft. A limiting groove is formed on the circumferential surface of the steering wheel. The end of the folding cable is movably passed through the through holes. The steering wheel supports the folding cable, and the folding cable is movably received in the limiting groove.

[0020] The present invention provides a construction method for a pre-tensioned I-beam intelligent tensioning pedestal, including the following steps:

[0021] Lay a bottom mold on the table plate;

[0022] Pass the middle part of the folding cable through the first steering device, pass the two ends of the folding cable through the second steering device respectively, and install the two ends of the folding cable on the upper anchor beam of the tensioning device;

[0023] Install the two ends of the straight cable on the lower anchor beam of the tensioning device at the two ends of the table plate respectively;

[0024] The magnetic flux sensor collects the first stress of the prestressed cable, the stress-strain sensor collects the second stress of the steel strip of the support member, and the rangefinder collects the displacements of the upper anchor beam and the lower anchor beam;

[0025] The controller obtains the first stress, the second stress, and the displacement, and activates the tensioning jack to tension the folded cable and the straight cable in stages, so that the first stress of the prestressed cable conforms to a preset stress value.

[0026] The beneficial effect of the present invention lies in that the pre-tensioning I-beam intelligent tensioning pedestal of the present invention forms a new force transmission structure of the pre-tensioning I-beam intelligent tensioning pedestal by setting components such as a second deflector, an upper anchor beam, a lower anchor beam, an anchoring member, a steel belt for traction, an uplift pile, and a support member, realizing the force system conversion between the prestressed cable and the pre-tensioning I-beam intelligent tensioning pedestal and the simultaneous production of multiple beams, that is, converting the form in which the prestress of the traditional beam manufacturing is borne by the beam manufacturing pedestal in the form of axial pressure into decomposing the prestressed tendon into vertical tension and horizontal axial pressure, with the vertical tension borne by the uplift pile and the horizontal axial pressure composed of the beam manufacturing pedestal.

[0027] The pre-tensioning I-beam intelligent tensioning pedestal of the present invention realizes the adjustment of different prestressed cable angles and the simultaneous production of multiple beams through the combined use of a first deflector (permanent deflector) and a second deflector (temporary deflector). Finally, by setting a tensioning device, the combination of a magnetic flux sensor (obtaining the stress of the prestressed cable), a stress-strain sensor (obtaining the stress of the steel belt), a rangefinder (obtaining the tensioning moving displacement), an intelligent jack (realizing tensioning), and a controller ensures the tensioning safety and quality in real time during the tensioning process, realizes the dual control of stress and displacement during the tensioning process, and realizes the intelligent control of the tensioning process.

[0028] The pre-tensioning I-beam intelligent tensioning pedestal of the present invention not only realizes the deflection of different prestressed cables and the adjustment of their deflection angles, but also decomposes the huge prestress of the prestressed cable, realizes the light weight of the tensioning pedestal, and thus can greatly reduce the size of the beam manufacturing pedestal, saving the construction period and construction cost. The uplift pile set in the pre-tensioning I-beam intelligent tensioning pedestal of the present invention not only plays a huge role in bearing the vertical component force of the prestressed cable, but also plays a huge role in improving the foundation bearing capacity of the platform slab, thus saving the cost of foundation treatment under the beam manufacturing pedestal. Description of the Drawings

[0029] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent:

[0030] Figure 1 It is a schematic structural diagram of the pre-tensioning I-beam intelligent tensioning pedestal according to an embodiment of the present invention.

[0031] Figure 2 is Figure 1 The cross-sectional view at A-A in

[0032] Figure 3 is Figure 1The sectional view taken along line B-B in [].

[0033] Figure 4 is Figure 1 The sectional view taken along line C-C in [].

[0034] Figure 5 is Figure 1 The sectional view taken along line D-D in [].

[0035] Figure 6 is Figure 1 The sectional view taken along line E-E in [].

[0036] Figure 7 The structural schematic diagram of the support frame according to the embodiment of the present invention.

[0037] Figure 8 The side view of the anchor according to the embodiment of the present invention.

[0038] Figure 9 The sectional view of the anchor according to the embodiment of the present invention.

[0039] Figure 10 The structural schematic diagram of the second steering gear according to the embodiment of the present invention.

[0040] Figure 11 The internal structural schematic diagram of the second steering gear according to the embodiment of the present invention.

[0041] Figure 12 The structural schematic diagram of the first steering gear according to the embodiment of the present invention.

[0042] Figure 13 The structural schematic diagram of the adjusting bracket according to the embodiment of the present invention.

[0043] Figure 14 The top view of the clamping member according to the embodiment of the present invention.

[0044] Figure 15 The structural schematic diagram of the tensioning device according to the embodiment of the present invention. Detailed implementation manners

[0045] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for the sake of description, only the parts related to the invention are shown in the drawings.

[0046] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0047] Refer to Figure 1 and Figure 5As shown, prestressed cables are embedded within the pretensioned I-beam 7. These cables consist of straight cables 5 and folded cables 6. The straight cables run the entire length of the pretensioned I-beam 7, while the folded cables are embedded in the middle of the pretensioned I-beam 7 and extend along its length. The ends of the folded cables are angled upward and outward. The prestressed cables in the pretensioned I-beam 7 are tensioned in stages using the pretensioning method.

[0048] Refer to Figures 1 to 15 As shown, the present invention provides a pre-tensioned I-beam intelligent tensioning pedestal, comprising: a pedestal 1, a support frame 2, anti-pullout piles 3, and a tensioning device 4.

[0049] Platform 1 is laid on the foundation. The foundation is compacted first. The platform serves as the base formwork for the pre-tensioned I-beam. The base formwork consists of I-beam distribution beams laid on platform 1 according to design requirements. Channel steel is installed on the distribution beams as longitudinal distribution beams. A 6mm-thick composite stainless steel panel is installed on the longitudinal distribution beams to serve as the base formwork for the pre-tensioned I-beams.

[0050] The middle position of the table top 1 is adjustably mounted with a first diverter 11 for passing the middle portion of the folding wire 6. The two ends of the table top 1 are respectively mounted with second diverters 12 for passing the two ends of the folding wire 6.

[0051] The first diverter is a permanent diverter that is later embedded in the pre-tensioned I-beam. The second diverter is set at both ends of the platform and is set outside the pre-tensioned I-beam. It serves as a temporary diverter that can be used in turnaround construction.

[0052] Two support frames 2 are installed at opposite ends of the table 1. The support frame 2 includes an anchor 21 erected on multiple foundations and attached to the end of the table 1, a support 22 and a steel belt 23 arranged in the same direction as the table 1. One end of the support 22 is supported on the side of the anchor 21 away from the table 1. A plurality of pull-out piles 3 are buried in the foundation. The steel belt 23 is tied between the other end of the support 22 and the upper part of the anchor 21. A plurality of pull-out piles 3 are buried in the foundation along the length direction of the table 1. The anchor 21, the support 22 and the middle part of the table 1 are respectively connected to the pull-out piles 3. The upper and lower parts of the anchor 21 are respectively provided with through holes. A force-transmitting steel rod can be movably inserted into the through hole.

[0053] The tensioning device 4 includes an upper anchor beam 41, a lower anchor beam 42, a magnetic flux sensor 43 installed on the prestressed cable, a stress-strain sensor 44 installed on the steel strip 23, a rangefinder 45 for collecting the displacements of the upper anchor beam 41 and the lower anchor beam 42, a tensioning jack 46, and a controller 47. The upper anchor beam 41 is installed at the end of the folded cable 6 and connected to one end of a force-transferring steel bar in a perforation in the upper part of the anchoring member 21. The lower anchor beam 42 is installed at the end of the straight cable 5 and connected to one end of a force-transferring steel bar in a perforation in the lower part of the anchoring member 21. The tensioning jack 46 is installed on one side of the anchoring member 21 away from the platen 1 and connected to the other end of the force-transferring steel bar. The controller 47 is connected to the magnetic flux sensor 43, the stress-strain sensor 44, the rangefinder 45, and the tensioning jack 46.

[0054] During tensioning, the controller controls the tensioning jack to perform staged tensioning to 20%, 40%, 50%, 80%, and 100% of the designed tensile force. During the tensioning process, the controller automatically and real-time reads the cable force of each prestressed cable (including the straight cable and the folded cable) through the magnetic flux sensor, automatically and real-time reads the stress of the steel strip through the stress sensor, the rangefinder automatically collects the displacements of the upper anchor beam and the lower anchor beam, and compares the above measured values with the designed values in real time. When the error between the designed value and the actual value is within ±5%, the controller determines it to be normal and controls the tensioning jack to continue tensioning at the set speed; when the error between the designed value and the actual value is between 5% and 10%, the controller controls the tensioning jack to slow down the tensioning speed to 50% of the designed value, and the controller determines and prompts an abnormality; when the error between the designed value and the actual value is between 5% and 10%, the controller controls the tensioning jack to stop tensioning, and the controller determines and prompts an inspection.

[0055] After tensioning is completed, both the tensile force and the tensioning displacement meet the design requirements, and the error is within the designed allowable range, realizing the dual control of the tensile force and the tensioning displacement. Through the controller, both the safety control of the tensioning process and the dual control of the tensile force and the tensioning displacement of the prestressed cable are realized, ensuring the construction quality and realizing the function of intelligent tensioning.

[0056] Pour and vibrate the concrete of the I-beam, and perform curing. After reaching the strength required by the design, unscrew the pressing member of the wedge block, remove the wedge block, and the U-shaped clamping block, then use a cutting machine to cut the prestressed cable of the I-beam along the support rod to realize the relaxation of the prestressed cable of the I-beam, and then loosen the prestressed cable connector and clean the residual section connected to the connector after the prestressed cable is cut. Use a crane to lift the prefabricated I-beam to the beam storage area.

[0057] As a preferred embodiment, refer to Figure 1 、 Figure 12 、 Figure 13 and Figure 14 , the first deflector 11 is installed on the platen 1 in a position-adjustable manner through the adjusting bracket 13.

[0058] The adjusting bracket 13 includes: a base plate 131 and side plates 132.

[0059] The base plate 131 is laid on the table plate 1. Ear plates 136 are formed by downward extension of opposite ends of the base plate 131. The ear plates 136 are connected to two steel pipe piles of an uplift pile 3.

[0060] The two side plates 132 are arranged oppositely. The side plates 132 are erected on the base plate 131. Clamping members 133 are respectively installed on opposite sides of the two side plates 132. A support rod 134 is clamped between the two clamping members 133. The support rod 134 is arranged at an angle with the table plate 1. The first steering device 11 is installed at the upper end of the support rod 134. The lower end of the support rod 134 extends below the two clamping members 133. A pressing member is installed at the lower end of the support rod 134. A wedge block 135 is interposed between the pressing member and the clamping member 133.

[0061] In this embodiment, the foundation under the table plate is first tamped, then 10 cm of recycled mixture is laid to level the foundation, then a precast concrete slab foundation is laid at the designed position, and then the formwork is supported at the designed position to pour the concrete of the table plate. After the concrete of the table plate is poured and reaches the designed strength, the base plate connects the poured table plate with the uplift pile driven into the soil through the ear plates to provide uplift force for the I-beam precast pedestal.

[0062] Preferably, each uplift pile 3 includes two steel pipe piles arranged side by side. The two steel pipe piles are supported on opposite sides of the anchoring member 21, the supporting member 22, and the table plate 1.

[0063] Continue to refer to Figure 13 As shown, the support rod 134 is a screw rod. The pressing member is provided with a threaded hole. The pressing member is screwed onto the lower end of the support rod 134. In this embodiment, the pressing member is a nut.

[0064] Refer to Figure 14 , notches are formed on opposite sides of the clamping member, so that the clamping member is integrally U-shaped. The side plate is provided with a threaded hole, and a jacking screw rod is screwed in the threaded hole of the side plate. The jacking screw rod is connected to the clamping member. In this embodiment, a support plate is connected to the top of the side plate. The support plate is provided with a strip-shaped through hole. The support rod is movably inserted through the strip-shaped through hole of the support plate.

[0065] Continue to refer to Figure 11 and Figure 12 , the first steering device 11 is coaxially arranged with the support rod 134. A plurality of reaction pressure rods 111 arranged at intervals along the length direction of the first steering device 11 are respectively connected to opposite sides of the first steering device 11. The middle part of the folding wire 6 is inserted between two adjacent reaction pressure rods 111.

[0066] Refer to Figures 1 to 3As shown, the lower part of the anchor 21 slides on the upper end of an uplift pile 3.

[0067] Combined with Figure 8 and Figure 9 As shown, the anchor is a steel box. There is concrete in the pipe pile inside the steel box. A casing is buried in the steel box to form a first channel for the steel rod to pass through and a second channel for the steel strip to pass through.

[0068] Refer to Figure 2 and Figure 7 , one end of the support 22 is placed on the upper end of an uplift pile 3. A pressing beam 221 is arranged at one end of the support 22. Both ends of the pressing beam 221 are respectively tied to the upper end of an uplift pile 3 through tie rods 222.

[0069] Refer to Figure 4 , Figure 10 and Figure 11 As shown, a plurality of through holes are formed inside the second deflector 12. A fixed shaft 121 is detachably installed in the through holes. A deflector wheel 122 is rotatably sleeved on the fixed shaft 121. A limiting groove is formed on the circumferential surface of the deflector wheel 122. The end of the folding cable 6 is movably passed through the through holes. The deflector wheel 122 supports the folding cable 6. The folding cable 6 is movably received in the limiting groove.

[0070] The present invention provides a construction method for a pre-tensioned I-beam intelligent tensioning pedestal, including the following steps:

[0071] S1: Lay a bottom mold on the table board 1.

[0072] S2: Pass the middle part of the folding cable 6 through the first deflector 11, pass the two ends of the folding cable 6 through the second deflector 12 respectively, and install the two ends of the folding cable 6 on the upper anchor beam 41 of the tensioning device 4.

[0073] S3: Install the two ends of the straight cable 5 on the lower anchor beam 42 of the tensioning device 4 at the two ends of the table board 1 respectively.

[0074] S4: The magnetic flux sensor 43 collects the first stress of the prestressed cable, the stress-strain sensor 44 collects the second stress of the steel strip 23 of the support 22, and the rangefinder 45 collects the displacements of the upper anchor beam 41 and the lower anchor beam 42.

[0075] S5: The controller 47 obtains the first stress, the second stress and the displacements, and activates the tensioning jack 46 to tension the folding cable 6 and the straight cable 5 in stages, so that the first stress of the prestressed cable conforms to the preset stress value.

[0076] The intelligent tensioning pedestal for pretensioned I-beams of the present invention realizes the conversion of the prestressing cable in the pretensioned I-beam from a straight line to a broken line by setting a first deflector. Secondly, by setting components such as a second deflector, an upper anchor beam, a lower anchor beam, an anchor, a steel strip for traction, an uplift pile, and a support member, a new force transmission structure of the intelligent tensioning pedestal for pretensioned I-beams is formed, realizing the force system conversion between the prestressing cable and the intelligent tensioning pedestal for pretensioned I-beams and the simultaneous production of multiple beams. That is, the traditional form in which the prestress for beam manufacturing is borne by the beam manufacturing pedestal in the form of axial pressure is converted into decomposing the prestressing tendon into vertical tension and horizontal axial pressure, with the vertical tension borne by the uplift pile and the horizontal axial pressure composed of the beam manufacturing pedestal.

[0077] The intelligent tensioning pedestal for pretensioned I-beams of the present invention realizes the adjustment of different prestressing cable angles and the simultaneous production of multiple beams through the combined use of a first deflector (permanent deflector) and a second deflector (temporary deflector). Finally, by setting a tensioning device, the combination of a magnetic flux sensor (acquiring the stress of the prestressing cable), a stress-strain sensor (acquiring the stress of the steel strip), a rangefinder (acquiring the tensioning moving displacement), an intelligent jack (realizing tensioning), and a controller ensures the tensioning safety and quality in real time during the tensioning process, realizes the dual control of stress and displacement during the tensioning process, and realizes the intelligent control of the tensioning process.

[0078] The intelligent tensioning pedestal for pretensioned I-beams of the present invention not only realizes the deflection of different prestressing cables and the adjustment of their deflection angles, but also decomposes the huge prestress of the prestressing cable, realizing the light weight of the tensioning pedestal. As a result, the size of the beam manufacturing pedestal can be greatly reduced, saving the construction period and construction cost. The uplift pile set in the intelligent tensioning pedestal for pretensioned I-beams of the present invention not only bears the vertical component force of the prestressing cable, but also plays a huge role in improving the bearing capacity of the foundation of the slab, thus saving the cost of foundation treatment under the beam manufacturing pedestal.

[0079] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An intelligent tensioning pedestal for pretensioned I-beams. The prestressing cables of the pretensioned I-beams include straight cables and folded cables. It is characterized in that, The intelligent tensioning pedestal for pretensioned I-beams includes: A table board laid on the foundation. A first deflector through which the middle part of the folded cable passes is adjustably installed at the middle position of the table board, and second deflectors through which the two ends of the folded cable pass are respectively installed at the two ends of the table board; Two support frames installed at the opposite ends of the table board. The support frame includes an anchor fixed vertically on multiple foundations and fitting against the end of the table board, a support member arranged in the same direction as the table board, and a steel belt. One end of the support member is supported on the side of the anchor away from the table board. Multiple uplift piles are buried in the foundation. The steel belt is tied between the other end of the support member and the upper part of the anchor. Multiple uplift piles are buried in the foundation along the length direction of the table board. The anchor, the support member, and the middle part of the table board are respectively connected to the uplift piles. Through holes are respectively formed in the upper and lower parts of the anchor, and a force-transferring steel rod is movably inserted into the through holes; A tensioning device, including an upper anchor beam, a lower anchor beam, a magnetic flux sensor installed on the prestressing cable, a stress and strain sensor installed on the steel belt, a rangefinder for collecting the displacements of the upper anchor beam and the lower anchor beam, a tensioning jack, and a controller. The upper anchor beam is installed at the end of the folded cable and connected to one end of the force-transferring steel rod in the through hole in the upper part of the anchor. The lower anchor beam is installed at the end of the straight cable and connected to one end of the force-transferring steel rod in the through hole in the lower part of the anchor. The tensioning jack is installed on the side of the anchor away from the table board and connected to the other end of the force-transferring steel rod. The controller is connected to the magnetic flux sensor, the stress and strain sensor, the rangefinder, and the tensioning jack; Each uplift pile includes two steel pipe piles arranged side by side, and the two steel pipe piles support the opposite sides of the anchor, the support member, and the table board; The first deflector is adjustably installed on the table board through an adjusting bracket. The adjusting bracket includes: A base plate laid on the table board. Ear plates extending downward are formed at the opposite ends of the base plate, and the ear plates are connected to the two steel pipe piles of one uplift pile; Two side plates arranged oppositely. The side plates are vertically arranged on the base plate. Clamping members are respectively installed on the opposite sides of the two side plates. A support rod is clamped between the two clamping members. The support rod is arranged at an angle with the table board. The first deflector is installed at the upper end of the support rod. The lower end of the support rod extends below the two clamping members. A pressing member is installed at the lower end of the support rod. A wedge block is interposed between the pressing member and the clamping member.

2. The pre-tensioned I-beam intelligent tensioning pedestal according to claim 1, wherein, The support rod is a screw rod, and the pressing member is provided with a threaded hole and is screwed onto the lower end of the support rod.

3. The pre-tensioned I-beam intelligent tensioning pedestal according to claim 1, characterized in that, The first deflector is coaxially arranged with the support rod. Multiple reaction pressure bars are respectively connected to the opposite sides of the first deflector at intervals along the length direction of the first deflector. The middle part of the folded cable passes between two adjacent reaction pressure bars.

4. The pre-tensioned I-beam intelligent tensioning pedestal according to claim 1, wherein, The lower part of the anchor slides on the upper end of one uplift pile.

5. The intelligent tensioning pedestal for pretensioned I-beams according to claim 1, characterized in that, One end of the support member is placed on the upper end of an anti-pullout pile. A downward pressure beam is provided on one end of the support member. Both ends of the downward pressure beam are respectively connected to the upper end of the anti-pullout pile through a pull rod.

6. The pre-tensioned I-beam intelligent tensioning pedestal according to claim 1, characterized in that, A plurality of through holes are provided inside the second steering gear, a fixed shaft is detachably installed in the through hole, a steering wheel is rotatably mounted on the fixed shaft, a limiting groove is formed on the circumferential surface of the steering wheel, the end of the folding wire is movably passed through the through hole, the steering wheel is supported on the folding wire, and the folding wire is movably accommodated in the limiting groove.

7. A construction method for a pre-tensioned I-beam intelligent tensioning pedestal as described in any one of claims 1 to 6, characterized in that, The following steps are involved: Lay the base formwork on the tabletop; Passing the middle of the folding wire through the first diverter, passing both ends of the folding wire through the second diverter respectively, and installing both ends of the folding wire on the upper anchor beam of the tensioning device; Installing the two ends of the straight line to the lower anchor beams of the tensioning device at both ends of the platform respectively; The magnetic flux sensor collects the first stress of the prestressed cable, the stress and strain sensor collects the second stress of the steel belt of the support member, and the distance meter collects the displacement of the upper anchor beam and the lower anchor beam; The controller obtains the first stress, the second stress and the displacement, and activates the tensioning jacks to tension the bent cable and the straight cable in stages, so that the first stress of the prestressed cable meets a preset stress value.

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