Temperature self-adaptive tower beam longitudinal constraint construction method based on CFRP cable

Abstract

The invention provides a temperature self-adaption tower beam longitudinal constraint construction method based on a CFRP cable, and belongs to the technical field of temperature self-adaption tower beam longitudinal constraint construction methods based on the CFRP cable. Comprising a main tower, main tower cross beam anchoring structure assemblies are arranged at the front end and the rear end, close to the left side edge and the right side edge, of the bottom surface of the main tower correspondingly, and a steel beam midspan CFRP cable anchoring structure assembly is arranged on one side of each main tower cross beam anchoring structure assembly. A 25T truck crane is arranged on a railway surface below a main tower, the truck crane is mainly used for hoisting coiled CFRP cables to a cable releasing disc and assisting in hoisting a cable body, a CFRP horizontal inhaul cable beam bottom supporting frame A and a CFRP horizontal inhaul cable beam bottom supporting frame B to be welded in a factory in the cable releasing process, and longitudinal beams and an aluminum grating plate platform are installed through a steel structure scaffold platform. Firstly, a truck crane hoists a rail longitudinal beam to a mounting platform, then drags the rail longitudinal beam to the position under a design position and lifts the rail longitudinal beam to the design position through a chain block, and a welding platform truck is matched with a mounting longitudinal beam bolt for mounting.

Description

Technical Field

[0001] The invention relates to the technical field of a temperature-adaptive tower-beam longitudinal restraint construction method based on CFRP cables, and in particular to a temperature-adaptive tower-beam longitudinal restraint construction method based on CFRP cables. Background Art

[0002] At present, with the advancement of science and technology, the span of bridges is constantly being updated. Long-span bridges have large spans and heavy loads. Under the action of wind load, temperature load, and live load, the main beam will produce a large end displacement, and the main tower will produce a large bending moment. Appropriate technical solutions need to be adopted to improve the end displacement of the beam and the bending moment of the main tower. If we follow the traditional approach, the tower-beam generally adopts a damping constraint solution, a limit constraint solution, and an elastic cable constraint solution.

[0003] However, the large displacement along the bridge has an adverse effect on bridge deck driving, and also brings challenges to the design of bearings, beam end telescopic systems, and track telescopic adjusters, and cannot improve the stress on the main tower. In addition, the limit system has a large reaction moment, which makes the structural design difficult. The impact between the limit system and the main beam also has an adverse effect on bridge deck driving. By using the temperature-adaptive tower-beam longitudinal restraint system (TARS), CFRP horizontal cables are set between the crossbeam under the main tower and the mid-span of the steel beam of the main channel bridge to change the horizontal load transmission path, reduce the bending moment at the bottom of the tower, and reduce the foundation scale. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a temperature-adaptive tower-beam longitudinal constraint construction method based on CFRP cables, which solves the problems of large reaction torque of the limit system, difficult structural design, impact between the limit system and the main beam, and adverse effects on bridge deck driving.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A temperature-adaptive tower-beam longitudinal constraint construction method based on CFRP cables comprises a main tower, wherein the main tower cross beam anchoring structure components are respectively arranged at the front and rear ends of the bottom surface of the main tower near the left and right edges, and a steel beam mid-span CFRP cable anchoring structure component is arranged on one side of each of the main tower cross beam anchoring structure components, and a plurality of support structure components A and support structure components B are arranged in an array at the left and right edges of the bottom surface of the main tower, and a mid-span anchoring end component is arranged between every two of the support structure components A and the support structure components B, and all the CFRP horizontal cables are passed through the main tower beam anchorage structure assembly, the steel beam mid-span CFRP cable anchorage structure assembly, the support structure assembly A, the support structure assembly B and the mid-span anchorage end assembly. The whole bridge has a common CFRP cable, one root is arranged on the main tower side, and one root is arranged on the upstream and downstream sides. The CFRP horizontal cable is anchored in the side anchor box in the middle of the main beam span and tensioned at the main tower beam. The side anchor box in the middle of the main beam span uses a steel anchor box. The main tower beam uses a TAS cable anchor tooth block with a steel-concrete hybrid structure. The CFRP cable uses a -Φmm finished cable, and the reinforcement material used is mm carbon fiber reinforcement.

[0009] Preferably, the main tower beam anchoring structure assembly comprises a tensioning end anchor cup, a side of the tensioning end anchor cup is provided with a plurality of through holes in an array, and an anchor plate is provided inside each of the through holes.

[0010] Preferably, the outer side of each anchor plate is covered with a back cover, the center of the outer surface of the tension end anchor cup is wrapped with an anchor ring, and the other side of the tension end anchor cup is provided with a plurality of CFRP cables in an arranged manner.

[0011] Preferably, the mid-span anchor end assembly comprises two mounting plate rows, and a plurality of cable mounting tubes are arranged and penetrated between the two mounting plate rows.

[0012] Preferably, each of the cable installation tubes is provided with support rods on the left and right sides respectively, and each of the cable installation tubes is provided with installation holes on the front and rear ends respectively.

[0013] Preferably, the support structure assembly A includes a support structure body A, a plurality of rubber rollers A are arranged in an array on the interior of the support structure body A near the top surface, arc-shaped aluminum grilles A are respectively provided on the left and right sides of the support structure body A, and an aluminum grille plate A is provided on the bottom of the support structure body A.

[0014] Preferably, a plurality of CFRP finished cables A are arranged inside the supporting structure body A, a plurality of longitudinal beams A are arranged through the bottom of the aluminum grating plate A, and M bolts A are respectively penetrated through the left and right sides of the center of the bottom surface of each longitudinal beam A.

[0015] Preferably, the support structure assembly B includes a support structure body B, a plurality of rubber rollers B are arranged in an array on the interior of the support structure body B near the top surface, arc-shaped aluminum grilles B are respectively provided on the left and right sides of the support structure body B, and an aluminum grille plate B is provided on the bottom of the support structure body B.

[0016] Preferably, a plurality of CFRP finished cables B are arranged inside the supporting structure body B, a plurality of longitudinal beams B are arranged through the bottom of the aluminum grating plate B, and M bolts B are respectively penetrated on the left and right sides of the center of the bottom surface of each longitudinal beam B.

[0017] A temperature-adaptive tower-beam longitudinal constraint construction method based on CFRP cables comprises the following steps:

[0018] Step 1: Anchor the CFRP horizontal cable with an anchor box below the E node in the middle of the main beam, set the steel-concrete structure TARS cable anchor block for tensioning and anchoring at the main tower crossbeam position, and set the support frame A and support frame B structure support for the CFRP cable between the tensioning end and the anchoring end;

[0019] Step 2: The TARS cable anchor block at the end of the beam adopts a steel-concrete structure with a total cross-sectional size of .m×.m×.m in the horizontal direction and .m in the height. The lower part is a steel box reinforced concrete and the upper part is a steel box structure with a total steel volume of .t. In addition, a root JL prestressed coarse steel bar with a standard strength of f is set on the large mileage side of the anchor block. pk =Mpa, E =. × Mpa, the controlled tension stress under the anchor is Mpa, the elongation per linear meter is. mm, single-end tensioning is adopted, and the prestressed coarse steel bars and CFRP cables are tensioned synchronously;

[0020] Step 3: The CFRP horizontal cable beam bottom support structure is provided by setting support frame A and support frame B with a spacing of .m and .m. Support frame A is provided with a rubber roller, and a longitudinal beam and an aluminum grille plate protection platform are provided under the support frame;

[0021] Step 4: Set up an anchorage structure at the E node on the mid-span side of the main beam of the CFRP horizontal cable beam for CFRP cable anchorage. The size of the anchorage structure is .m in the horizontal direction × .m in the longitudinal direction × .m in the height.

[0022] Step 5: After the Z-segment steel beams on the mid-span side of the main channel bridge are erected, the CFRP cables are installed. After the main span of the main channel bridge steel beams is closed, the CFRP cables are tensioned and anchored according to monitoring instructions.

[0023] Step 6. During on-site construction, install the steel structure of the TARS cable anchoring tooth block at the end of the beam in advance, install the longitudinal beam and steel grating plate under the support frame, and start the CFRP horizontal cable threading construction after the Z-segment steel beam is erected. The cable threading winch is fixed on the lower bridge deck of the ZZ inter-segment steel beam, and the cable tray is arranged in the middle of the lower bridge deck of the ZZ inter-segment steel beam. The winch wire rope passes through the CFRP cable support structure at the bottom of the steel beam through the steering pulley, and after connecting the anchor cup, the CFRP cable is slowly pulled to the designed position. The tensioning construction will be completed at an appropriate time according to the monitoring instructions.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] In the above scheme, a 25T truck crane is set up on the railway surface below the main tower. The main function of the truck crane is to hoist the coiled CFRP cable to the cable drum and assist in lifting the cable body during the cable extension process. The bottom support frame A and support frame B of the CFRP horizontal cable beam are welded in the factory. The longitudinal beam and aluminum grating plate platform below the support frame are installed using a steel structure scaffolding platform. First, the truck crane hoists the track longitudinal beam to the installation platform, and then drags it to the bottom of the designed position. It is lifted to the designed position by a fall chain, and the welding platform car cooperates to install the longitudinal beam bolts. The aluminum grating plate is installed simultaneously during the installation process to complete the installation of the CFRP cable support platform. The temperature-adaptive tower beam longitudinal constraint system is used to set the CFRP horizontal cable between the lower crossbeam of the main tower and the mid-span of the steel beam of the main channel bridge to change the horizontal load transmission path, reduce the bending moment at the bottom of the tower, and reduce the foundation scale.

[0026] The steps of CFRP cable deployment are as follows: fix the 7.5T winch used for CFRP cable installation on the lower bridge deck in the middle of the Z45 segment steel beam, set rubber pads to wrap the corners above the support structure B, protect the cable body PE sheath during cable deployment, set square wood above the platform plate and the aluminum grille plate and wrap it with rubber pads, place the cable tray at the Z41-Z42 inter-segment steel beam position on the railway surface below the No. 1 inclined cable on the side span, and set an L-shaped roller above the railway surface material connection platform to protect the cable body during cable deployment. The construction personnel put the 7.5T winch steel below the main tower on the railway surface. The wire rope is pulled to the CFRP cable operating platform at the bottom of the beam through the steering pulley. Then the construction workers continue to pull the wire rope to the anchor position in the middle of the span along the operating platform. After the wire rope is pulled to the steel anchor box on the middle span side, a steering pulley is set up. The wire rope passes through the steering pulley, and the construction workers pull the wire rope toward the main tower again. When it is pulled near the main tower, it continues to be pulled until it reaches the placement position of the CFRP cable drum. A lifting point is set at the bottom of the steel beam at the support structure B position closest to the main tower. The lifting point consists of a wire rope and a soft lifting belt. Its main function is to control the direction of the cable extension and prevent damage to the cable body.

[0027] In summary, the present invention has the advantages of arranging CFRP horizontal cables between the lower cross beam of the main tower and the mid-span of the steel beam of the main channel bridge, changing the force transmission path of the horizontal load, reducing the bending moment at the bottom of the tower, and reducing the foundation scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the temperature-adaptive tower-beam longitudinal restraint device based on CFRP cables;

[0029] Figure 2 This is a schematic diagram of the structure of the mid-span anchor end assembly;

[0030] Figure 3 A schematic diagram of the three-dimensional structure of the main tower crossbeam anchoring structure assembly;

[0031] Figure 4 It is a schematic diagram of the structural plane of the main tower cross beam anchoring structure assembly;

[0032] Figure 5 It is a schematic diagram of the three-dimensional structure of the support structure component A and the support structure component B;

[0033] Figure 6 It is a schematic diagram of the structural plane of the supporting structure component A;

[0034] Figure 7 It is a schematic diagram of the structural plane of the supporting structure component B;

[0035] Figure 8 It is a schematic diagram of the structural plane of the CFRP cable anchoring structure assembly in the mid-span of the steel beam;

[0036] Fig. 9 It is a schematic diagram of the CFRP cable steel-concrete anchor tooth block structure;

[0037] Fig.10 Installation layout drawing of CFRP longitudinal beam;

[0038] Fig.11 This is a schematic diagram of the installation of the longitudinal beam of the CFRP cable support structure;

[0039] Fig.12 This is a schematic diagram for comparing temperature-adaptive tower-beam longitudinal restraint devices;

[0040] Fig.13 It is a comparative plan view of the temperature-adaptive tower-beam longitudinal restraint device;

[0041] Fig.14 This is a plan view of the restraint device.

[0042] [reference numerals]

[0043] 1. Main tower; 2. Main tower crossbeam anchoring structure assembly; 201. Tension end anchor cup; 202. Anchor plate; 203. Rear cover; 204. Anchor ring; 205. CFRP cable; 206. Through hole; 3. CFRP cable anchoring structure assembly in the middle of the steel beam; 4. Support structure assembly A; 401. Support structure body A; 402. Rubber roller A; 403. Curved aluminum grille A; 404. CFRP finished cable A; 405. Longitudinal beam A; 406. M1 4 bolts A; 407, aluminum grille plate A; 5, supporting structure assembly B; 501, supporting structure body B; 502, rubber roller B; 503, curved aluminum grille B; 504, CFRP finished cable B; 505, longitudinal beam B; 506, M14 bolt B; 507, aluminum grille plate B; 6, mid-span anchor end assembly; 601, installation plate; 602, cable installation tube; 603, support rod; 604, installation hole; 7, CFRP horizontal cable.

[0044] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0045] The following is a detailed description of a temperature-adaptive tower beam longitudinal constraint construction method based on CFRP cables provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0046] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0047] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0048] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0049] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0050] like Figure 1-Figure 4As shown, an embodiment of the present invention provides a temperature-adaptive tower-beam longitudinal constraint construction method based on CFRP cables, comprising a main tower 1, wherein main tower cross beam anchoring structure components 2 are respectively arranged at the front and rear ends of the bottom surface of the main tower 1 near the left and right edges, and a steel beam mid-span CFRP cable anchoring structure component 3 is arranged on one side of each main tower cross beam anchoring structure component 2, and a plurality of support structure components A4 and support structure components B5 are arranged in an arranged form at the left and right edges of the bottom surface of the main tower 1, and a mid-span anchoring end component 6 is arranged between every two support structure components A4 and support structure components B5, and CFRP horizontal cables 7 are passed through all the main tower cross beam anchoring structure components 2, the steel beam mid-span CFRP cable anchoring structure components 3, the support structure components A4, the support structure components B5 and the mid-span anchoring end components 6. There are 28 CFRP cables in the whole bridge, 14 of which are arranged on the main tower side and 7 on the upstream and downstream sides respectively. The CFRP horizontal cables are anchored by the main beam mid-span side anchor boxes. The main beam is tensioned, the side anchor box in the middle of the main beam is a steel anchor box, the TAS cable anchor tooth block of the steel-concrete hybrid structure is used at the main tower beam, the CFRP cable uses a 127-Φ7mm finished cable, and the reinforcement material used is a 7mm carbon fiber reinforcement. The main tower beam anchor structure component 2 includes a tensioning end anchor cup 201, and one side of the tensioning end anchor cup 201 is arranged with a plurality of through holes 206, each through hole 206 is provided with an anchor plate 202 inside, and the outer side of each anchor plate 202 is covered with a back cover 20 3. An anchor ring 204 is wrapped at the center of the outer surface of the tension end anchor cup 201, and a plurality of CFRP cables 205 are arranged on the other side of the tension end anchor cup 201. The mid-span anchor end assembly 6 includes two mounting plates 601, and a plurality of cable mounting tubes 602 are arranged between the two mounting plates 601. Support rods 603 are respectively provided on the left and right sides of each cable mounting tube 602, and mounting holes 604 are respectively opened at the front and rear ends of each cable mounting tube 602.

[0051] The installation by traction at the fixed end is divided into the following steps:

[0052] Step 1: When the fixed-end anchor cup is pulled to the vicinity of the mid-span steel anchor box, the construction workers set up a fall chain at the bottom of the steel beam on one side of the anchor pad. The fall chain passes through the anchor cup nut and then passes through the cable guide tube to connect with the fixed-end anchor cup.

[0053] Step 2: Construction workers use the fall chain to pull the fixed-end anchor cup so that it can pass smoothly through the steel anchor box cable guide.

[0054] Step 3: When the anchor cup is completely inserted into the cable guide tube, the construction workers install a protective device at the cable guide tube opening and use a fall chain to lift the cable body at the cable guide tube position to prevent the cable guide tube opening from scratching the cable body.

[0055] Step 4: Install the fixed end anchor cup nut to the designed position, and the fixed end traction installation is completed.

[0056] The installation by pulling the tension end is divided into the following steps:

[0057] Step 1: After the fixed end anchor cup is installed in place, use a 7.5T winch to start the traction installation of the tensioning end.

[0058] Step 2: Slowly start the winch and extend the cable in the same way as the fixed end until the anchor cup at the tensioning end is pulled to the anchor position near the main tower.

[0059] Step 3: The construction workers use the fall chain to pull the anchor cup at the tensioning end out of the anchor pad, install the anchor cup nut to the flat cap, and wait for tensioning.

[0060] like Figure 5-Figure 9 As shown, in this embodiment, the support structure assembly A4 includes a support structure body A401, a plurality of rubber rollers A402 are arranged in an array on the inner side of the support structure body A401 near the top surface, an arc-shaped aluminum grille A403 is respectively arranged on the left and right sides of the support structure body A401, an aluminum grille plate A407 is arranged at the bottom of the support structure body A401, a plurality of CFRP finished cables A404 are arranged in an array on the inner side of the support structure body A401, a plurality of longitudinal beams A405 are arranged through the bottom of the aluminum grille plate A407, and an M14 bolt is respectively penetrated at the left and right sides of the center of the bottom surface of each longitudinal beam A405. A406, the supporting structure assembly B5 includes a supporting structure body B501, a plurality of rubber rollers B502 are arranged in an array on the inner side of the supporting structure body B501 close to the top surface, arc-shaped aluminum grilles B503 are respectively arranged on the left and right sides of the supporting structure body B501, an aluminum grille plate B507 is arranged on the bottom of the supporting structure body B501, a plurality of CFRP finished cables B504 are arranged in an array on the inner side of the supporting structure body B501, a plurality of longitudinal beams B505 are arranged through the bottom of the aluminum grille plate B507, and an M14 bolt B506 is respectively penetrated through the left and right sides of the center of the bottom surface of each longitudinal beam B505.

[0061] The steps of pulling the cable body are as follows: open the outer packaging of the CFRP horizontal cable, remove the anchor cup nut at the fixed end, place the anchor cup nut in advance at the anchor position of the fixed end of the CFRP cable on the mid-span side, install a pulling plate at the rear end of the anchor cup at the fixed end, connect the 7.5T winch wire rope arranged in advance to the pulling plate, lift the cable body to a straight angle by the truck crane, start the winch for pulling, pass the L-shaped roller above the railway surface receiving platform, enter the bottom of the beam, and use the lifting belt and clamp (5-ton U-shaped clamp) to hang the cable body on the wire rope fixed in advance under the steel beam (during the pulling process, a dedicated person observes the cable body, and uses the truck crane to adjust the cable body angle in time to avoid contact with hard materials and cause PE Sheath damage), continue to pull to the support structure B position closest to the main tower where the fixed end anchor cup is located, the construction personnel use the fall chain to assist in adjusting the height and angle of the anchor cup so that it can pass through support structure B smoothly, and continue to pull. When the fixed end anchor cup is about to pass through support structure A and support structure B, the construction personnel lift the anchor cup and adjust the anchor cup angle so that the anchor cup can pass through support structure A and support structure B smoothly. After the fixed end anchor cup passes through the support structure, the rear cable body is manually lifted, square wood is used for padding under the cable body, and rubber pads are wrapped on the square wood to protect the PE sheath of the cable body, and the pulling is continued. When the cable body on the cable drum is 4-5m, the pulling is stopped. Then, a lifting point is set on the cable body near the tensioning end anchor cup, and the lifting point is lifted by a car crane to lift the remaining cable body out of the air. Start the winch to continue pulling. When the tensioning end anchor cup is pulled to the railway surface receiving platform, the truck crane will lift the anchor cup to the bottom of the receiving platform. When the anchor cup is hung on the steel wire rope fixed in advance under the steel beam, the truck crane lifting point will be released and the 7.5T winch will continue to be started for pulling. When the fixed end anchor cup is pulled to the vicinity of the anchor point of the steel anchor box in the mid-span, stop pulling.

[0062] like Figure 1-Figure 11 As shown, in this embodiment, the TARS cable steel-concrete structure is used to anchor the tooth block. The lower 0.98m steel box-reinforced concrete part has been constructed, and the remaining upper 1.428m steel box structure has not been installed and is temporarily placed on the crossbeam surface. The steel box structure part of the TARS cable steel-concrete structure anchoring tooth block is limited by the installation height space. The jack + slideway is used to move it horizontally to the designed position, and then the splicing plate is installed, and the M30 high-strength bolts are tightened. The bottom support frame A and support frame B of the CFRP horizontal cable beam are welded in the factory. The remaining 64 longitudinal beams and all aluminum grating plates need to be installed on site due to untimely installation in the factory. The longitudinal beam and aluminum grating plate platform under the support frame are installed using a steel structure scaffolding platform. First, the track longitudinal beam is hoisted to the installation platform by a car crane, and then dragged to the bottom of the design position, and lifted to the design position by a fall chain. The welding platform car cooperates to install the longitudinal beam bolts. The aluminum grating plate is installed simultaneously during the installation process to complete the installation of the CFRP cable support platform.

[0063] The steps for laying out the CFRP cables are as follows: fix the 7.5T winch used for installing the CFRP cables on the lower bridge deck in the middle of the Z45 segment steel beam, set rubber pads to wrap the corners above the supporting structure B, protect the cable body with a PE sheath during the cable laying process, set square wood above the platform plate and the aluminum grating plate and wrap them with rubber pads, place the cable tray at the Z41-Z42 inter-segment steel beam position on the railway surface below the No. 1 inclined cable on the side span, and set an L-shaped roller above the railway surface material receiving platform to protect the cable body during the cable laying process. The construction personnel pull the 7.5T winch wire rope below the main tower of the railway surface to the CFRP cable operating platform at the bottom of the beam through the steering pulley, and then the construction personnel continue to pull the wire rope to the mid-span anchor position along the operating platform. After the wire rope is pulled to the steel anchor box on the middle span side, a steering pulley is set up, and the wire rope passes through the steering pulley. The construction personnel pull the wire rope toward the main tower again. When it is pulled near the main tower, it continues to be pulled until it reaches the placement position of the CFRP cable drum. A lifting point is set at the bottom of the steel beam at the position of the supporting structure B closest to the main tower. The lifting point is composed of a wire rope and a soft lifting belt. Its main function is to control the direction of the cable extension and prevent damage to the cable body. The steering pulley is fixed to the base of the railway bridge guardrail with a steering ear plate, and the steering pulley is fixed to the ventilation hole on the inner side of the tower limb with a wire rope and a steel section. The steering pulley is fixed to the lower crossbeam of the main tower with 4 M20 expansion bolts and anchor plates. The steering pulley is fixed by welding a steering ear plate on the bottom surface of the steel beam.

[0064] like Figure 12-14 As shown, Fig.12 The supporting structure component A4 in Fig.13 The supporting structure A in the Fig.12 The support structure component B5 in Fig.13 The supporting structure B in the Fig.12 CFRP horizontal cables 7 and Fig.13 The CFRP cable in the tensioning end is matched. When the fixed end anchor cup is installed in place, the 7.5T winch is used to start the tensioning end traction installation. The winch is slowly started, and the cable extension method is the same as the fixed end until the tensioning end anchor cup is pulled to the anchor position near the main tower. The construction personnel use the fall chain to pull the tensioning end anchor cup out of the anchor pad, install the anchor cup nut to the flat cap, and wait for the tensioning end to be pulled out.

[0065] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0066] A temperature-adaptive tower-beam longitudinal restraint construction method based on CFRP cables, when used, comprises the following steps;

[0067] Step 1: Anchor the CFRP horizontal cable with an anchor box below the E86 node in the middle of the main beam, set a steel-concrete structure TARS cable anchor block for tensioning and anchoring at the main tower crossbeam position, and set support frame A and support frame B structural support for the CFRP cable between the tensioning end and the anchoring end;

[0068] Step 2: The TARS cable anchor block at the end of the beam adopts a steel-concrete structure with a total cross-sectional size of 3.78m horizontally × 2.5m vertically × 2.408m in height. The lower 0.98m is a steel box reinforced concrete, and the upper 1.428m is a steel box structure. The total amount of steel used is 34.4t. In addition, 9 JL40 prestressed coarse steel bars with a standard strength of f are set on the large mileage side of the anchor block. pk =930Mpa, E = 2.0×10 5 Mpa, the controlled tension stress under the anchor is 500Mpa, the elongation per meter is 2.5mm, single-end tensioning is adopted, and the prestressed coarse steel bars and CFRP cables are tensioned synchronously;

[0069] Step 3: CFRP horizontal cable beam bottom support structure, set support frame A and support frame B, with a spacing of 8.4m and 11.2m, support frame A is equipped with rubber rollers, and longitudinal beams and aluminum grille plate protection platforms are set under the support frame;

[0070] Step 4: An anchor structure is set at the E86 node on the mid-span side of the CFRP horizontal cable beam for CFRP cable anchoring. The dimensions of the anchor structure are 3.62m in the horizontal direction × 2.86m in the vertical direction × 0.77m in the height.

[0071] Step 5: After the erection of the Z85-86 segment steel beam on the mid-span side of the main channel bridge steel beam is completed, the CFRP cable installation construction is carried out. After the main span of the main channel bridge steel beam is closed, the CFRP cable tensioning and anchoring construction is carried out according to the monitoring instructions.

[0072] Step 6. During on-site construction, install the steel structure of the TARS cable anchoring tooth block at the end of the beam in advance, install the longitudinal beam and steel grating plate under the support frame, and start the CFRP horizontal cable threading construction after the Z85-86 segment steel beam is erected. The cable threading winch is fixed on the lower bridge deck of the steel beam between Z46 and Z47, and the cable tray is arranged in the middle of the lower bridge deck between Z41 and Z42. The winch wire rope passes through the CFRP cable support structure at the bottom of the steel beam through the steering pulley, and the CFRP cable is slowly pulled to the designed position after connecting the anchor cup. The tensioning construction will be completed at an appropriate time according to the monitoring instructions.

[0073] The technical solution provided by the present invention is as follows: first, a 25T truck crane is arranged on the railway surface below the main tower. The main function of the truck crane is to hoist the coiled CFRP cable onto the cable tray and to assist in lifting the cable body during the cable extension process. The bottom support frame A and the support frame B of the CFRP horizontal cable beam are welded in the factory. The longitudinal beam and the aluminum grating plate platform below the support frame are installed using a steel structure scaffolding platform. First, the truck crane hoists the rail longitudinal beam to the installation platform, and then drags it to the bottom of the designed position, and uses a fall chain to lift it to the designed position. The welding platform car cooperates with the installation of the longitudinal beam bolts, and the aluminum grating plate is installed simultaneously during the installation process to complete the installation of the CFRP cable support platform. The temperature-adaptive tower beam longitudinal constraint system is used to set a CFRP horizontal cable between the lower crossbeam of the main tower and the middle span of the steel beam of the main channel bridge, so as to change the horizontal load transmission path, reduce the tower bottom bending moment, and reduce the foundation scale. Then, the CFRP cable is extended and arranged in the following steps: the 7.5T winch used for the installation of the CFRP cable is fixed on the lower bridge deck in the middle position of the Z45 segment steel beam, and the support structure is fixed on the support structure. Rubber pads were set at the corners above the structure B to protect the PE sheath of the cable body during the cable extension process. Square wood was set above the platform plate and the aluminum grille plate and wrapped with rubber pads. The cable tray was placed at the Z41-Z42 inter-section steel beam position of the railway surface below the No. 1 inclined cable on the side span side, and an L-shaped roller was set above the railway surface material receiving platform to protect the cable body during the cable extension process. The construction personnel pulled the 7.5T winch wire rope at the position below the main tower of the railway surface to the CFRP cable operating platform at the bottom of the beam through the steering pulley, and then the construction personnel The workers continue to pull the wire rope toward the anchorage position in the middle of the span along the operating platform. After the wire rope is pulled to the steel anchor box on the middle span side, a steering pulley is set up. The wire rope passes through the steering pulley, and the construction workers pull the wire rope toward the main tower again. When it is pulled near the main tower, it continues to be pulled until it reaches the CFRP cable drum placement position. A lifting point is set at the bottom of the steel beam at the support structure B position closest to the main tower. The lifting point consists of a wire rope and a soft lifting belt. Its main function is to control the direction of the cable extension and prevent damage to the cable body.

[0074] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A temperature-adaptive tower-beam longitudinal restraint structure based on CFRP cables, characterized in that: The invention comprises a main tower (1), wherein the main tower cross beam anchoring structure components (2) are respectively arranged at the front and rear ends of the bottom surface of the main tower (1) near the left and right edges, and a steel beam mid-span CFRP cable anchoring structure component (3) is arranged on one side of each main tower cross beam anchoring structure component (2); a plurality of support structure components A (4) and support structure components B (5) are respectively arranged in an array at the left and right edges of the bottom surface of the main tower (1), and a mid-span anchoring end component (6) is arranged between every two of the support structure components A (4) and the support structure components B (5); and a CFRP horizontal cable (7) is passed through between all the main tower cross beam anchoring structure components (2), the steel beam mid-span CFRP cable anchoring structure components (3), the support structure components A (4), the support structure components B (5) and the mid-span anchoring end component (6); The whole bridge has a total of 28 CFRP cables, 14 of which are arranged on the main tower side and 7 on the upstream and downstream sides respectively. The CFRP horizontal cables are anchored by side anchor boxes in the middle of the main beam span and tensioned at the cross beam of the main tower. Steel anchor boxes are used for the side anchor boxes in the middle of the main beam span. TAS cables with a steel-concrete hybrid structure are used for anchoring tooth blocks at the cross beam of the main tower. The CFRP cables are 127-Φ7mm finished cables, and the reinforcement material used is 7mm carbon fiber reinforcement.

2. The temperature-adaptive tower-beam longitudinal restraint device based on CFRP cables according to claim 1 is characterized in that: The main tower beam anchoring structure assembly (2) comprises a tensioning end anchor cup (201), one side of which is provided with a plurality of through holes (206) arranged in an array, and an anchor plate (202) is provided inside each of the through holes (206).

3. The temperature-adaptive tower-beam longitudinal restraint device based on CFRP cables according to claim 2 is characterized in that: The outer side of each anchor plate (202) is covered with a back cover (203), the center of the outer surface of the tension end anchor cup (201) is wrapped with an anchor ring (204), and the other side of the tension end anchor cup (201) is provided with a plurality of CFRP cables (205) in an arranged manner.

4. The temperature-adaptive tower-beam longitudinal restraint device based on CFRP cables according to claim 1 is characterized in that: The mid-span anchor end assembly (6) comprises two mounting plate rows (601), and a plurality of cable mounting tubes (602) are arranged and penetrated between the two mounting plate rows (601).

5. The temperature-adaptive tower-beam longitudinal restraint device based on CFRP cables according to claim 4 is characterized in that: Each of the cable installation tubes (602) is provided with support rods (603) on both sides thereof, and each of the cable installation tubes (602) is provided with installation holes (604) on both ends thereof.

6. The temperature-adaptive tower-beam longitudinal restraint construction method based on CFRP cables according to claim 1 is characterized in that: The support structure assembly A (4) includes a support structure body A (401), wherein a plurality of rubber rollers A (402) are arranged in an array on the inner side of the support structure body A (401) near the top surface, and arc-shaped aluminum grilles A (403) are respectively arranged on the left and right sides of the support structure body A (401), and an aluminum grille plate A (407) is arranged at the bottom of the support structure body A (401).

7. The temperature-adaptive tower-beam longitudinal restraint construction method based on CFRP cables according to claim 6 is characterized in that: A plurality of CFRP finished cables A (404) are arranged in an array inside the supporting structure body A (401), and a plurality of longitudinal beams A (405) are arranged through the bottom of the aluminum grille plate A (407), and an M14 bolt A (406) is respectively penetrated on the left and right sides of the center of the bottom surface of each longitudinal beam A (405).

8. The temperature-adaptive tower-beam longitudinal restraint construction method based on CFRP cables according to claim 1 is characterized in that: The support structure assembly B (5) includes a support structure body B (501), wherein a plurality of rubber rollers B (502) are arranged in an array on the inner side of the support structure body B (501) near the top surface, arc-shaped aluminum grilles B (503) are respectively arranged on the left and right sides of the support structure body B (501), and an aluminum grille plate B (507) is arranged at the bottom of the support structure body B (501).

9. The temperature-adaptive tower-beam longitudinal restraint construction method based on CFRP cables according to claim 8 is characterized in that: The interior of the supporting structure body B (501) is provided with a plurality of CFRP finished cables B (504) in an arranged manner, and the bottom of the aluminum grille plate B (507) is penetrated by a plurality of longitudinal beams B (505) in an arranged manner, and each longitudinal beam B (505) is penetrated by an M14 bolt B (506) on the left and right sides of the center of the bottom surface.

10. The temperature-adaptive tower-beam longitudinal restraint construction method based on CFRP cables according to claim 1, characterized in that: The following steps are involved: Step 1: Anchor the CFRP horizontal cable with an anchor box below the E86 node in the middle of the main beam, set a steel-concrete structure TARS cable anchor block for tensioning and anchoring at the main tower crossbeam position, and set support frame A and support frame B structural support for the CFRP cable between the tensioning end and the anchoring end; Step 2: The TARS cable anchor block at the end of the beam adopts a steel-concrete structure with a total cross-sectional size of 3.78m horizontally × 2.5m vertically × 2.408m in height. The lower 0.98m is a steel box reinforced concrete, and the upper 1.428m is a steel box structure. The total amount of steel used is 34.4t. In addition, 9 JL40 prestressed coarse steel bars with a standard strength of f are set on the large mileage side of the anchor block. pk =930Mpa, E = 2.0×10 5 Mpa, the controlled tension stress under the anchor is 500Mpa, the elongation per meter is 2.5mm, single-end tensioning is adopted, and the prestressed coarse steel bars and CFRP cables are tensioned synchronously; Step 3: CFRP horizontal cable beam bottom support structure, set support frame A and support frame B, with a spacing of 8.4m and 11.2m, support frame A is equipped with rubber rollers, and longitudinal beams and aluminum grille plate protection platforms are set under the support frame; Step 4: An anchor structure is set at the E86 node on the mid-span side of the CFRP horizontal cable beam for CFRP cable anchoring. The dimensions of the anchor structure are 3.62m in the horizontal direction × 2.86m in the vertical direction × 0.77m in the height. Step 5: After the erection of the Z85-86 segment steel beam on the mid-span side of the main channel bridge steel beam is completed, the CFRP cable installation construction is carried out. After the main span of the main channel bridge steel beam is closed, the CFRP cable tensioning and anchoring construction is carried out according to the monitoring instructions. Step 6. During on-site construction, install the steel structure of the TARS cable anchoring tooth block at the end of the beam in advance, install the longitudinal beam and steel grating plate under the support frame, and start the CFRP horizontal cable threading construction after the Z85-86 segment steel beam is erected. The cable threading winch is fixed on the lower bridge deck of the steel beam between Z46 and Z47, and the cable tray is arranged in the middle of the lower bridge deck between Z41 and Z42. The winch wire rope passes through the CFRP cable support structure at the bottom of the steel beam through the steering pulley, and the CFRP cable is slowly pulled to the designed position after connecting the anchor cup. The tensioning construction will be completed at an appropriate time according to the monitoring instructions.

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