A tensioning and pasting device for prestressed carbon fiber cloth patches and its use method

Abstract

The present invention belongs to the field of building structure engineering and discloses a prestressed carbon fiber cloth patch tensioning and pasting device and its use method. The device includes a fixing assembly, an anchor tensioning assembly, and a pushing assembly. The fixing assembly includes two reaction plates and a guide rod. The reaction plates are each provided with a U-shaped plate, and the guide rod is threaded with a nut. The pushing assembly includes a jack and a support block. The anchor tensioning assembly includes two anchoring frames, two first anchoring plates, and two sliding bearings. The two first anchoring plates are fixed between the two anchoring frames by bolts. The two first anchoring plates are respectively in conflict with two sliding bearings. The two sliding bearings are placed between two U-shaped plates on the same side. The outer sleeves of the two sliding bearings are connected to carbon fiber cloth. The present invention solves the problem that existing prestressed carbon fiber tensioning devices are only suitable for large-scale tensioning of carbon fiber materials. It is suitable for local areas using patch-type carbon fiber cloth for prestressing and pasting.

Description

Technical Field

[0001] The present invention relates to the field of building structure engineering, and in particular to a tensioning and pasting device for a prestressed carbon fiber cloth patch and a use method thereof. Background Art

[0002] Although China achieved remarkable structural success early on, its development remained largely limited to iron buildings. It wasn't until the late 19th century that my country began to adopt modern steel structures. Subsequently, the application of steel structures has significantly expanded, with significant increases in both quantity and quality. By the early 21st century, steel structures had become widespread and steadily developed in my country, with steel structures widely used in buildings, railways, bridges, and residential buildings. Tens of thousands of steel structure companies of all sizes now operate, and the world's most advanced steel fabrication equipment is readily available. With the widespread use of steel structures, challenges have arisen. Common carbon fiber reinforcement methods for steel structures include prestressed and non-prestressed methods. Prestressed methods require larger anchors and are therefore generally used for large-scale beam reinforcement. Non-prestressed carbon fiber reinforcement can be applied to steel plates in a patch-like manner, but the lack of prestressing results in less effective fatigue reinforcement, and the carbon fiber's strength cannot be fully utilized.

[0003] Carbon fiber cloth has the properties of light weight, high strength, low creep, low density, thin thickness, low thermal expansion coefficient and good acid and alkali corrosion resistance. It is widely used in various structural repair and reinforcement in bridges, buildings and other projects. Among them, carbon fiber cloth reinforcement is divided into non-prestressed reinforcement and prestressed reinforcement. Non-prestressed reinforcement mainly uses adhesive to stick carbon fiber cloth to the position of the structure to be reinforced to carry out reinforcement; prestressed reinforcement is based on non-prestressed reinforcement. It uses a tensioning device to apply target prestress to the carbon fiber cloth, and then uses anchoring and pasting processes to treat the position of the structure to be reinforced, so as to achieve the purpose of reinforcing the structure. Compared with non-prestressed reinforcement, prestressed reinforcement can better give full play to the high strength of carbon fiber cloth, greatly improve the utilization rate of carbon plate, save materials and resources, and achieve significant reinforcement effect, greatly increasing the firmness of the structure, improving its bearing capacity and improving its bending resistance.

[0004] The use of prestressed carbon fiber cloth for gluing and reinforcing structures requires the use of a prestressed carbon fiber tensioning device. However, existing prestressed carbon fiber cloth tensioning devices are mainly suitable for large and medium-sized structures and are generally not adjustable. The tensioning device is complex and bulky, difficult to operate, often requires a wide area for operation, and requires a powerful anchoring device. Therefore, the existing tensioning device is mainly aimed at improving the overall mechanical properties of large structures and is suitable for large-scale tensioning of carbon fiber materials. However, 1) the prestressed carbon fiber cloth required for local gluing and reinforcement is small in size, the carbon fiber gluing area is small, and the carbon fiber tensioning tonnage is small. Without suitable prestressed carbon fiber cloth, the use of large-scale carbon fiber tensioning devices will cause a great waste of resources. 2) Steel structures often use stiffening ribs, tie bars, tie plates and other components to improve stability. The structural structure is complex. When gluing and reinforcing cracks or damage in local structural details, the construction operation space is very limited. The existing carbon fiber cloth tensioning device is difficult to meet the needs of local reinforcement within the limited operating space. 3) Traditional carbon fiber sheet tensioning methods result in significant prestress loss when tensioning short-bundle carbon fiber sheets, making it difficult to accurately determine effective prestress. The quality and efficiency of adhesive reinforcement work need to be improved. 4) The morphology and location of damage or cracks in local structural details of steel structures are random and diverse. The tensioning and bonding of prestressed carbon fiber sheeting must meet the reinforcement requirements of these various situations. This places high demands on the portability, operability, and adaptability of the carbon fiber tensioning and bonding device to the reinforcement site. Summary of the Invention

[0005] The present invention aims to provide a prestressed carbon fiber cloth patch tensioning and pasting device to solve the problem that the existing prestressed carbon fiber tensioning device is only suitable for large-scale tensioning of carbon fiber materials.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a tensioning and pasting device for a prestressed carbon fiber cloth patch, comprising a fixing component, an anchoring and tensioning component, and a pushing component;

[0007] The fixing assembly includes two reaction plates and guide rods passing through the two reaction plates, each reaction plate is provided with two U-shaped plates spaced apart, both ends of each guide rod are provided with threads, and each end of the guide rod is threadedly connected to two nuts;

[0008] The pushing assembly includes a jack and a support block connected to the jack, the jack abuts against any reaction plate, and the support block abuts against the other reaction plate;

[0009] The anchoring and tensioning assembly includes two anchoring frames, two first anchoring plates and two sliding bearings. The two anchoring frames are symmetrically arranged between the two reaction plates. The two first anchoring plates are fixed between the two anchoring frames by bolts. The two first anchoring plates are respectively in contact with the two sliding bearings. The two sliding bearings are placed between the two U-shaped plates on the same side. The outer sleeves of the two sliding bearings are connected with carbon fiber cloth.

[0010] Furthermore, the carbon fiber cloth is overlapped end to end to form a ring shape, and the overlapping area of ​​the carbon fiber cloth is coated with an adhesive layer.

[0011] Furthermore, a load pressure sensor is provided between each jack and the corresponding reaction plate.

[0012] Through the above settings, the effective tensioning force of the annular prestressed carbon fiber cloth during the tensioning process can be accurately obtained, thereby improving the bonding reinforcement quality of the prestressed carbon fiber cloth.

[0013] Furthermore, each of the jacks is provided with a pad, and each of the pads is slidably connected to the corresponding jack.

[0014] Through the above arrangement, the height of the jack is increased, so that the jack acts on the center of the support block, which is convenient for force bearing. At the same time, the pressure sensor is kept behind the jack, which can more accurately measure the applied pressure.

[0015] Furthermore, the method of using the stretching and pasting device is as follows:

[0016] S1. Annular prestressed carbon fiber cloth processing:

[0017] Apply adhesive layer on both ends of the carbon fiber cloth and overlap and stick them into a ring shape. After the adhesive is cured, a ring-shaped carbon fiber cloth is formed.

[0018] S2. Assembly of carbon fiber cloth stretching and pasting components:

[0019] Cover the two sliding bearings of the anchor tensioning assembly with carbon fiber cloth, place the two sliding bearings in the corresponding U-shaped plates, and then install the push assembly between the two reaction plates;

[0020] S3. Tensioning of carbon fiber cloth:

[0021] Use a jack to slowly apply prestress, and use the support block to drive the reaction plate to gradually move in the opposite direction, thereby applying prestress in the carbon fiber cloth;

[0022] S4. Installation of anchoring and tensioning components:

[0023] After applying prestress, two first anchor plates are added to the carbon fiber cloth and fixed to the anchoring frame by bolts. At this time, the two first anchor plates are respectively in contact with the corresponding sliding bearings, and then the push assembly is removed;

[0024] S5. Applying adhesive layer and pasting carbon fiber cloth:

[0025] Apply adhesive layer to the overlap of carbon fiber cloth and stick it to the position that needs to be reinforced in carbon plate or steel plate;

[0026] S6. Maintenance and cutting of prestressed carbon fiber cloth:

[0027] After the adhesive layer solidifies, it is cured for five days as required. The non-adhesive part of the carbon fiber cloth is cut off and the anchor tensioning component is removed to complete the tensioning and bonding of the prestressed carbon fiber cloth.

[0028] Compared with the existing technical solutions, the present invention has the following beneficial effects:

[0029] 1. This solution fully utilizes the high strength, thinness, softness and bendability of prestressed carbon fiber cloth. The carbon fiber cloth is pre-overlapped and pasted end to end to form a closed loop structure, constructing a self-tensioning system. This eliminates the need for complex anchoring components, simplifies the basic structure of this technical solution, and saves engineering material and equipment costs.

[0030] 2. This solution effectively maintains the pre-tensioning force in the annular carbon fiber cloth by adopting anchoring tensioning components, and enables the tensioning process and the bonding process of the carbon fiber cloth to be carried out simultaneously, and can be operated in different sites, which greatly improves the construction efficiency of prestressed tensioning, improves the tensioning quality, and ensures the construction progress.

[0031] 3. This solution uses a jack to push the support block to drive the reaction plate to move, thereby realizing the tensioning of the carbon fiber cloth. The tensioning force required for the carbon fiber cloth is directly provided by the jack. The force system is simple and clear. The pushing component has a simple structure, is easy to disassemble, occupies a small space, and requires a small operating space. The annular carbon fiber cloth can be prestressed on site and the prestressed carbon fiber cloth can be pasted indoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a front view of a tensioning and pasting device for a prestressed carbon fiber cloth patch according to the present invention;

[0033] Figure 2 Schematic diagram of the structure of the anchoring and tensioning assembly in this embodiment;

[0034] Figure 3 Schematic diagram of the structure of the push assembly in this embodiment;

[0035] Figure 4Schematic diagram of the structure of the fixing assembly in this embodiment;

[0036] Figure 5 Schematic diagram of the processing of annular carbon fiber cloth in this embodiment;

[0037] The names of the corresponding marks in the accompanying drawings are: fixing assembly 1, anchoring and tensioning assembly 2, pushing assembly 3, carbon fiber cloth 4, reaction plate 5, guide rod 6, U-shaped plate 7, nut 8, jack 9, support block 10, pad 11, anchor fixing frame 12, first anchor plate 13, sliding bearing 14, load pressure sensor 15, second anchor plate 16, bolt 17, adhesive layer 18. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0039] like Figures 1 to 5 As shown, a tensioning and pasting device for a prestressed carbon fiber cloth patch includes a fixing component 1, an anchoring and tensioning component 2 and a pushing component 3.

[0040] The fixing assembly 1 includes two reaction plates 5 and guide rods 6 extending through each end of the reaction plates 5. Each reaction plate 5 has a circular through-hole at each end for the guide rods 6 to pass through. Two spaced-apart U-shaped plates 7 are fixedly connected to the center of each reaction plate 5. Each guide rod 6 has threads on both ends, and two nuts 8 are threadedly connected to each end of the guide rod 6.

[0041] There are two jacking assemblies 3, which are symmetrically arranged on both sides of the two U-shaped plates 7. Each jacking assembly 3 includes a jack 9 and a support block 10 connected to the jack 9. The jack 9 is abutted against one reaction plate 5 through a load pressure sensor, and the support block 10 is abutted against the other reaction plate 5. Each jack 9 is slidably connected to a pad 11 fixedly connected to the reaction plate 5. The lower surfaces of the pad 11, the reaction plate 5, and the support block 10 are located on the same horizontal plane, which is more conducive to assembly, while reducing the space occupied by the device and making it easier to transport and carry.

[0042] The anchoring and tensioning assembly 2 includes two anchoring frames 12, two first anchoring plates 13, and two sliding bearings 14. The two anchoring frames 12 are symmetrically arranged between the two reaction plates 5. Each anchoring frame 12 has multiple threaded holes equidistantly spaced. The two first anchoring plates 13 are fixed between the two anchoring frames 12 by bolts 17. Each end of the two first anchoring plates 13 has an arc-shaped notch. Each first anchoring plate 13 contacts the corresponding sliding bearing 14 through the notch, and there is no clearance between the first anchoring plates 13 and the sliding bearings 14. Two second anchoring plates 16 also contact the two first anchoring plates 13. The two second anchoring plates 16 are fixed between the two anchoring frames 12 by bolts 17. The two sliding bearings 14 are placed between the two U-shaped plates 7 on the same side. The outer shells of the two sliding bearings 14 are connected with carbon fiber cloth 4. The carbon fiber cloth 4 is overlapped end to end to form a ring shape, and the overlapping area of ​​the carbon fiber cloth 4 is coated with an adhesive layer 18.

[0043] The method of using the tensioning and pasting device is as follows:

[0044] S1, Annular prestressed carbon fiber cloth 4 processing:

[0045] Apply adhesive layer 18 to both ends of the carbon fiber cloth 4 and overlap and glue them together to form a ring. After the adhesive layer 18 cures, the ring-shaped carbon fiber cloth 4 is formed. The overlapping length of the adhesive layer 18 applied to the two free ends of the carbon fiber cloth 4 should be calculated and determined based on the tensioning tonnage. The minimum length of the carbon fiber cloth 4 is twice the sum of the axis spacing of the sliding bearing 14, the circumference of the outer ring of the sliding bearing 14, and the overlap length. This step can be prefabricated indoors.

[0046] S2. Assembly of 4 carbon fiber cloth stretching and pasting components:

[0047] Slide the carbon fiber cloth 4 over the two sliding bearings 14 of the anchoring and tensioning assembly 2. The adhesive area of ​​the carbon fiber cloth 4 is located at the front of the assembly, while the adhesive layer 18 of the carbon fiber cloth 4 itself is located at the rear. The two sliding bearings 14 are then placed within their corresponding U-shaped plates 7, and the thrust assembly 3 is installed between the two reaction plates 5.

[0048] S3, tensioning of carbon fiber cloth 4:

[0049] Prestress is slowly applied using the jack 9, which gradually moves the reaction plate 5 in the opposite direction via the support block 10, thereby applying prestress to the carbon fiber cloth 4 and ultimately achieving the target tensioning stress. At the end of the tensioning of the carbon fiber cloth 4, the sliding bearing 14 is in close contact with the inner side of the annular carbon fiber cloth 4, and the anchor tensioning assembly 2 withstands the axial pressure and tangential friction of the annular prestressed carbon fiber cloth 4. In this embodiment, the required tensioning force for the carbon fiber cloth 4 is directly provided by the jack 9. Prestress losses during the tensioning of the carbon fiber cloth 4 should be considered, including elastic and plastic compression losses of the anchor tensioning assembly 2, as well as plastic deformation losses of the carbon fiber cloth 4 during the curing time of the adhesive layer 18.

[0050] S4. Installation of anchoring and tensioning assembly 2:

[0051] After prestressing, two first anchor plates 13 and two second anchor plates 16 are added to the carbon fiber cloth 4. Bolts 17 secure the two first anchor plates 13 and the two second anchor plates 16 to the anchoring frame 12. At this point, the two first anchor plates 13 contact their corresponding sliding bearings 14, maintaining the fixed shape of the anchoring and tensioning assembly 2 and thus maintaining the stress in the carbon fiber cloth 4. The thrust assembly 3 is then removed, and the effective prestress in the carbon fiber cloth 4 is calculated by reading the strain value of the strain sensor installed on the carbon fiber cloth 4.

[0052] S5. Apply the adhesive layer 18 and stick it to the carbon fiber cloth 4:

[0053] An adhesive layer 18 is applied to the front end of the carbon fiber cloth 4 and the cloth is attached to the position of the carbon plate or steel plate that needs to be reinforced.

[0054] S6, Prestressed carbon fiber cloth 4 maintenance and cutting:

[0055] After the adhesive layer 18 is cured, it is cured for five days as required, the non-adhesive portion of the carbon fiber cloth 4 is cut off, and the anchoring and tensioning assembly 2 is removed to complete the tensioning and bonding of the prestressed carbon fiber cloth 4.

[0056] In practical applications, a ring-shaped carbon fiber cloth 4 can be fabricated indoors, then prestressed using a push assembly 3 and a fixing assembly 1. A load pressure sensor determines whether the target tensile stress has been reached. The anchoring and tensioning assembly 2 then maintains the tensile stress in the carbon fiber cloth 4. This tensioning and pasting device can repeatedly tension the carbon fiber cloth 4. The prestressed carbon fiber cloth 4 can then be directly used at the construction site for bonding and reinforcing local structures.

[0057] The above is only an embodiment of the present invention, and common knowledge such as the specific technical solutions or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A tensioning and pasting device for prestressed carbon fiber cloth patches, characterized by: It includes fixing components, anchoring and tensioning components and jacking components; The fixing assembly includes two reaction plates and guide rods passing through the two reaction plates, each reaction plate is provided with two U-shaped plates spaced apart, both ends of each guide rod are provided with threads, and each end of the guide rod is threadedly connected to two nuts; The pushing assembly includes a jack and a support block connected to the jack, the jack abuts against any reaction plate, and the support block abuts against the other reaction plate; The anchoring and tensioning assembly includes two anchoring frames, two first anchoring plates and two sliding bearings. The two anchoring frames are symmetrically arranged between the two reaction plates. The two first anchoring plates are fixed between the two anchoring frames by bolts. The two first anchoring plates are respectively in conflict with the two sliding bearings. The two sliding bearings are placed between the two U-shaped plates on the same side. The outer sleeves of the two sliding bearings are connected with carbon fiber cloth. Two second anchoring plates are also in conflict between the two first anchoring plates.

2. The tensioning and pasting device for a prestressed carbon fiber cloth patch according to claim 1, characterized in that: The carbon fiber cloth is overlapped end to end to form a ring shape, and the overlapping area of ​​the carbon fiber cloth is coated with an adhesive layer.

3. The tensioning and pasting device for a prestressed carbon fiber cloth patch according to claim 1, characterized in that: A load pressure sensor is provided between each jack and the corresponding reaction plate.

4. The prestressed carbon fiber cloth patch tensioning and pasting device according to claim 1, characterized in that: Each of the jacks is provided with a pad, and each of the pads is slidably connected to the corresponding jack.

5. A tensioning and pasting device for a prestressed carbon fiber cloth patch according to any one of claims 1 to 4, characterized in that: The method of using the stretching and pasting device is as follows: S1. Annular prestressed carbon fiber cloth processing: Apply adhesive layer on both ends of the carbon fiber cloth and overlap and stick them into a ring shape. After the adhesive is cured, a ring-shaped carbon fiber cloth is formed. S2. Assembly of carbon fiber cloth tensioning and pasting components: Cover the two sliding bearings of the anchor tensioning assembly with carbon fiber cloth, place the two sliding bearings in the corresponding U-shaped plates, and then install the push assembly between the two reaction plates; S3. Tensioning of carbon fiber cloth: Use a jack to slowly apply prestress, and use the support block to drive the reaction plate to gradually move in the opposite direction, thereby applying prestress in the carbon fiber cloth; S4. Installation of anchoring and tensioning components: After applying prestress, two first anchor plates are added to the carbon fiber cloth and fixed to the anchoring frame by bolts. At this time, the two first anchor plates are respectively in contact with the corresponding sliding bearings, and then the push assembly is removed; S5. Applying adhesive layer and pasting carbon fiber cloth: Apply adhesive layer to the overlap of carbon fiber cloth and stick it to the position that needs to be reinforced in carbon plate or steel plate; S6. Maintenance and cutting of prestressed carbon fiber cloth: After the adhesive layer solidifies, it is cured for five days as required. The non-adhesive part of the carbon fiber cloth is cut off and the anchor tensioning component is removed to complete the tensioning and bonding of the prestressed carbon fiber cloth.

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