CN105507169A - Tensioning and anchoring device for reinforcing reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and reinforcing method - Google Patents
Tensioning and anchoring device for reinforcing reinforced concrete bridge through prestress FRP(fiber reinforced plastic) cloth and reinforcing method Download PDFInfo
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- CN105507169A CN105507169A CN201610028018.1A CN201610028018A CN105507169A CN 105507169 A CN105507169 A CN 105507169A CN 201610028018 A CN201610028018 A CN 201610028018A CN 105507169 A CN105507169 A CN 105507169A
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- 239000004744 fabric Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 19
- 238000004873 anchoring Methods 0.000 title claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 title claims 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 title 1
- 239000011151 fibre-reinforced plastic Substances 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000000712 assembly Effects 0.000 claims abstract description 7
- 238000000429 assembly Methods 0.000 claims abstract description 7
- 239000003822 epoxy resin Substances 0.000 claims description 14
- 229920000647 polyepoxide Polymers 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims 1
- 238000001879 gelation Methods 0.000 claims 1
- 239000003292 glue Substances 0.000 claims 1
- 238000010030 laminating Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 239000004567 concrete Substances 0.000 description 3
- 229920006335 epoxy glue Polymers 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 208000032170 Congenital Abnormalities Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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Abstract
一种预应力FRP布加固钢筋混凝土桥梁的张拉锚固定装置及加固方法，它涉及一种张拉锚固定装置及加固方法，具体涉及一种预应力FRP布加固钢筋混凝土桥梁的张拉锚固定装置及加固方法。本发明为了解决现有粘贴FRP布加固桥梁方法导致FRP布的应力水平降低，不能有效发挥其强度高的优势，导致桥梁加固效果较差的问题。本发明包括FRP布、预应力张拉台座、两个张拉组件、两个三角支架、两个锚固组件和两个钢滚轴，两个三角支架并排设置在预应力张拉台座的上表面上，每个三角支架的上端分别安装一个钢滚轴，每个三角支架的下端分别设置一个所述张拉组件，FRP布的两端分别与两个所述锚固组件连接，每个所述锚固组件分别绕过一个钢滚轴与相对应的一个所述张拉组件连接。属于路桥建设领域。
A tension anchor fixing device and reinforcement method for a reinforced concrete bridge reinforced with prestressed FRP cloth, which relates to a tension anchor fixing device and a reinforcement method, in particular to a tension anchor fixing device for a reinforced concrete bridge reinforced with prestressed FRP cloth Devices and reinforcement methods. The present invention aims to solve the problem that the stress level of the FRP cloth is lowered due to the reduction of the stress level of the FRP cloth by the existing method of pasting the FRP cloth to strengthen the bridge, and the advantage of its high strength cannot be effectively brought into play, resulting in poor bridge reinforcement effect. The invention includes FRP cloth, prestressed tensioning pedestal, two tensioning components, two triangular brackets, two anchoring components and two steel rollers, and the two triangular brackets are arranged side by side on the upper surface of the prestressed tensioning pedestal , a steel roller is respectively installed on the upper end of each triangular bracket, and one said tensioning assembly is respectively arranged on the lower end of each triangular bracket, and the two ends of the FRP cloth are respectively connected with two said anchoring assemblies, and each said anchoring assembly respectively bypassing a steel roller and connecting with a corresponding tensioning assembly. It belongs to the field of road and bridge construction.
Description
技术领域technical field
本发明涉及一种张拉锚固定装置及加固方法，具体涉及一种预应力FRP布加固钢筋混凝土桥梁的张拉锚固定装置及加固方法，属于路桥建设领域。The invention relates to a tension anchor fixing device and a reinforcement method, in particular to a tension anchor fixing device and a reinforcement method for a reinforced concrete bridge reinforced with prestressed FRP cloth, and belongs to the field of road and bridge construction.
背景技术Background technique
钢筋混凝土桥梁通常会由于以下原因而导致使用功能以及极限承载能力的不足，这些因素包括：第一、设计上的先天缺陷；第二、使用荷载的增加；第三、因碰撞以及腐蚀造成的结构损伤而导致的承载能力降低。为了保持这些功能退化的桥梁结构的正常使用，需要对这类桥梁结构进行加固以提高其使用性能。Reinforced concrete bridges usually have insufficient functions and ultimate bearing capacity due to the following reasons. These factors include: first, congenital defects in design; second, increase in service load; third, structural damage caused by collision and corrosion Reduced load-carrying capacity due to damage. In order to maintain the normal use of these degraded bridge structures, it is necessary to strengthen such bridge structures to improve their performance.
纤维增强树脂基复合材料FRP具有比重小、强度高、耐腐蚀、几何形状易于制作的优点，成为一种理想的桥梁加固材料，近年来在桥梁加固中得到了广泛的研究和工程应用。粘贴FRP布是最常使用的一种桥梁加固方式，由于粘贴FRP布是一种被动加固方式，汽车等活载产生的应变增量有限，在破坏阶段，FRP布的应力水平降低，因此不能有效地发挥FRP强度高的优势，加固效果一般。Fiber-reinforced resin-based composite material FRP has the advantages of small specific gravity, high strength, corrosion resistance, and easy-to-fabricate geometry, and has become an ideal bridge reinforcement material. It has been widely studied and applied in bridge reinforcement in recent years. Pasting FRP cloth is the most commonly used bridge reinforcement method. Since pasting FRP cloth is a passive reinforcement method, the strain increment caused by live loads such as automobiles is limited. In the failure stage, the stress level of FRP cloth decreases, so it cannot be effective The advantages of high strength of FRP are fully utilized, and the reinforcement effect is average.
为此，发展一种预应力FRP布主动加固技术是提高FRP布加固效果的有效手段，即在粘贴之前，采用一套张拉设备对FRP布进行张拉，使之在高应力状态下粘贴，待粘贴完成后放张，从而对加固梁体施加预应力，进而大大提高桥梁抗弯承载力加固效果。实验研究已经证实，通过在桥梁的底部水平张拉FRP布不仅可以提高抗弯强度，而且可以提高抗剪强度。预应力FRP布同时也提高了梁的使用性能，在使用荷载作用下，减小了裂缝宽度和梁的变形，并且延迟了主梁弯曲屈服的发生。而实现这一加固技术的关键是一套能够应用于实际工程的FRP布张拉锚固装置。For this reason, the development of a prestressed FRP cloth active reinforcement technology is an effective means to improve the reinforcement effect of FRP cloth, that is, before pasting, a set of tensioning equipment is used to stretch the FRP cloth so that it can be pasted under high stress. After the pasting is completed, it is released to apply prestress to the reinforced beam body, thereby greatly improving the reinforcement effect of the bridge's flexural bearing capacity. Experimental studies have confirmed that not only the flexural strength but also the shear strength can be enhanced by horizontally stretching the FRP fabric at the bottom of the bridge. The prestressed FRP cloth also improves the service performance of the beam, reduces the crack width and the deformation of the beam under the load, and delays the occurrence of bending yield of the main beam. The key to realizing this reinforcement technology is a set of FRP fabric tensioning anchorage devices that can be applied to practical projects.
发明内容Contents of the invention
本发明为解决现有粘贴FRP布加固桥梁方法导致FRP布的应力水平降低，不能有效发挥其强度高的优势，导致桥梁加固效果较差的问题，进而提出一种预应力FRP布加固钢筋混凝土桥梁的张拉锚固定装置及加固方法。The present invention solves the problem that the stress level of FRP cloth is lowered due to the existing method of pasting FRP cloth to strengthen the bridge, and the advantage of its high strength cannot be effectively brought into play, resulting in poor bridge reinforcement effect, and further proposes a prestressed FRP cloth to strengthen the reinforced concrete bridge Tension anchor fixing device and reinforcement method.
本发明为解决上述问题采取的技术方案是：本发明所述装置包括FRP布、预应力张拉台座、两个张拉组件、两个三角支架、两个锚固组件和两个钢滚轴，两个三角支架并排设置在预应力张拉台座的上表面上，每个三角支架的上端分别安装一个钢滚轴，每个三角支架的下端分别设置一个所述张拉组件，FRP布的两端分别与两个所述锚固组件连接，每个所述锚固组件分别绕过一个钢滚轴与相对应的一个所述张拉组件连接。The technical solution adopted by the present invention to solve the above problems is: the device of the present invention includes FRP cloth, prestressed tensioning pedestal, two tensioning components, two triangle brackets, two anchoring components and two steel rollers, two Three triangular brackets are arranged side by side on the upper surface of the prestressed tensioning pedestal, and a steel roller is respectively installed on the upper end of each triangular bracket, and one said tensioning assembly is respectively arranged at the lower end of each triangular bracket, and the two ends of the FRP cloth are respectively It is connected with two anchor assemblies, and each anchor assembly is respectively connected to a corresponding tension assembly by winding around a steel roller.
本发明所述方法的具体步骤如下：The concrete steps of method of the present invention are as follows:
步骤一、在FRP布上预浸环氧树脂，将预浸好的FRP布的端头缠绕在方形空心梁上，环氧树脂固化后将两个方形空心梁通过固定螺栓连接在一起组成锚固组件；Step 1. Pre-impregnate epoxy resin on the FRP cloth, wrap the end of the pre-impregnated FRP cloth on the square hollow beam, and after the epoxy resin is cured, connect the two square hollow beams together through fixing bolts to form an anchor assembly ;
步骤二、锚固组件绕过三角支架上端的钢滚轴与三角支架下端的张拉组件的第二螺纹锚杆连接；Step 2, the anchoring component bypasses the steel roller at the upper end of the triangular support and connects with the second threaded anchor rod of the tensioning component at the lower end of the triangular support;
步骤三、在预应力张拉台座的下表面与脚手架之间并排设置两个千斤顶；Step 3, two jacks are arranged side by side between the lower surface of the prestressed tensioning pedestal and the scaffold;
步骤四、启动张拉组件将FRP布张拉到要求的应力水平后，在FRP布上表面和钢筋混凝土梁下表面涂抹环氧树脂胶；Step 4. After starting the tensioning component to stretch the FRP cloth to the required stress level, apply epoxy glue on the upper surface of the FRP cloth and the lower surface of the reinforced concrete beam;
步骤五、启动两个千斤顶将预应力张拉台座升起，使FRP布与钢筋混凝土梁贴合；Step 5. Start two jacks to raise the prestressed tensioning pedestal, so that the FRP cloth and the reinforced concrete beam can be attached;
步骤六、用注射器或者针头向FRP布与钢筋混凝土梁贴合处注射环氧树脂以除去贴合层中的气泡；Step 6. Use a syringe or a needle to inject epoxy resin into the joint between the FRP cloth and the reinforced concrete beam to remove the air bubbles in the joint layer;
步骤七、环氧树脂固化后，将两个千斤顶撤除，从钢滚轴处将多余的FRP布剪除，完成加固。Step 7. After the epoxy resin is cured, remove the two jacks, and cut off the excess FRP cloth from the steel roller to complete the reinforcement.
本发明的有益效果是：1、本发明能有效地完成FRP布的张拉，实现预应力FRP布的加固目的。2、有效发挥FRP布强度高的优势，提高桥梁加固效果；3、本发明操作简便快捷，能有效提高桥梁加固效率。The beneficial effects of the present invention are as follows: 1. The present invention can effectively complete the stretching of the FRP cloth and realize the reinforcement purpose of the prestressed FRP cloth. 2. The advantages of high strength of FRP cloth can be effectively utilized to improve the effect of bridge reinforcement; 3. The invention is easy and quick to operate and can effectively improve the efficiency of bridge reinforcement.
附图说明Description of drawings
图1是本发明施工现场应用示意图，图2是锚固组件的结构示意图，图3是预应力张拉台的结构示意图，图4是张拉组件的结构示意图。Fig. 1 is a schematic diagram of the application of the present invention on a construction site, Fig. 2 is a schematic structural diagram of an anchoring assembly, Fig. 3 is a schematic structural diagram of a prestressed tensioning table, and Fig. 4 is a schematic structural diagram of a tensioning assembly.
具体实施方式detailed description
具体实施方式一：结合图1至图4说明本实施方式，本实施方式所述一种预应力FRP布加固钢筋混凝土桥梁的张拉锚固定装置包括FRP布1、预应力张拉台座2、两个张拉组件、两个三角支架3、两个锚固组件和两个钢滚轴4，两个三角支架3并排设置在预应力张拉台座2的上表面上，每个三角支架3的上端分别安装一个钢滚轴4，每个三角支架3的下端分别设置一个所述张拉组件，FRP布1的两端分别与两个所述锚固组件连接，每个所述锚固组件分别绕过一个钢滚轴4与相对应的一个所述张拉组件连接。Specific embodiment 1: This embodiment is described in conjunction with Fig. 1 to Fig. 4, a tension anchor fixing device of a prestressed FRP cloth reinforced reinforced concrete bridge described in this embodiment includes an FRP cloth 1, a prestressed tension pedestal 2, two A tensioning assembly, two triangular brackets 3, two anchoring assemblies and two steel rollers 4, the two triangular brackets 3 are arranged side by side on the upper surface of the prestressed tensioning pedestal 2, and the upper ends of each triangular bracket 3 are respectively A steel roller 4 is installed, and the lower end of each tripod 3 is respectively provided with a said tensioning assembly, and the two ends of the FRP cloth 1 are respectively connected with two said anchoring assemblies, and each said anchoring assembly bypasses a steel The rollers 4 are connected with a corresponding tensioning assembly.
具体实施方式二：结合图2说明本实施方式，本实施方式所述一种预应力FRP布加固钢筋混凝土桥梁的张拉锚固定装置的每个所述锚固组件由两个方形空心梁5和两个固定螺栓6组成，两个方形空心梁5通过两个固定螺栓6连接。FRP布1的端头缠绕在方形空心梁5上，且至少要达到两层缠绕。两个方形空心梁5组合固定后使FRP布正好位于两个方形空心梁5之间，这样有助于防止FRP布1脱开，确保能够有效的施加轴向预应力荷载。其它组成及连接关系与具体实施方式一相同。Embodiment 2: This embodiment is described in conjunction with FIG. 2 . Each of the anchor components of a tension anchor fixing device for a prestressed FRP cloth reinforced reinforced concrete bridge described in this embodiment consists of two square hollow beams 5 and two It consists of two fixing bolts 6, and two square hollow beams 5 are connected by two fixing bolts 6. The end of the FRP cloth 1 is wound on the square hollow beam 5, and at least two layers of winding are required. After the two square hollow beams 5 are combined and fixed, the FRP cloth is just located between the two square hollow beams 5, which helps to prevent the FRP cloth 1 from disengaging and ensures that the axial prestressing load can be effectively applied. Other components and connections are the same as those in the first embodiment.
具体实施方式三：结合图3和图4说明本实施方式，本实施方式所述一种预应力FRP布加固钢筋混凝土桥梁的张拉锚固定装置，其特征在于：每个所述张拉组件包括第一反力架7、第二反力架8、液压千斤顶9、压力传感器10、钢板11、反力梁12、多个第一螺纹锚杆13和多个第二螺纹锚杆14，第一反力架7、液压千斤顶9、压力传感器10、第二反力架8、钢板11、反力梁12由上至下依次设置，液压千斤顶9的上端与第一反力架7的下表面连接，液压千斤顶9的下端通过压力传感器10与第二反力架8连接，每个第一螺纹锚杆13由下至上依次穿过反力梁12、钢板11与第一反力架7连接，每个第二螺纹锚杆14由下至上依次穿过反力梁12、钢板11、第二反力架8、第一反力架7与所述锚固组件连接。Specific Embodiment Three: This embodiment is described in conjunction with Fig. 3 and Fig. 4. A tension anchor fixing device for a prestressed FRP sheet reinforced reinforced concrete bridge described in this embodiment is characterized in that: each of the tension components includes The first reaction force frame 7, the second reaction force frame 8, the hydraulic jack 9, the pressure sensor 10, the steel plate 11, the reaction force beam 12, a plurality of first threaded anchor rods 13 and a plurality of second threaded anchor rods 14, the first The reaction frame 7, the hydraulic jack 9, the pressure sensor 10, the second reaction frame 8, the steel plate 11, and the reaction beam 12 are arranged sequentially from top to bottom, and the upper end of the hydraulic jack 9 is connected to the lower surface of the first reaction frame 7 , the lower end of the hydraulic jack 9 is connected to the second reaction force frame 8 through the pressure sensor 10, and each first threaded anchor rod 13 passes through the reaction force beam 12, the steel plate 11 and is connected to the first reaction force frame 7 from bottom to top in sequence, each A second threaded anchor rod 14 passes through the reaction beam 12, the steel plate 11, the second reaction frame 8, and the first reaction frame 7 from bottom to top to connect with the anchor assembly.
本实施方式中的反力梁12是用钢板、栓钉铆接或栓接在一起，在反力梁12的端部的上表面各焊接一块符合厚度要求的钢板，用来固定支撑钢滚轴的三角支架3，通过调整第一反力架7和第二反力架8的位置，以满足液压千斤顶9的行程要求，通过液压千斤顶9加力以施加到需要的预应力水平，当达到要求的应力水平时，旋紧所有的螺母，保持应力水平稳定不变。其它组成及连接关系与具体实施方式一相同。The reaction beam 12 in this embodiment is riveted or bolted together with steel plates, studs, and a steel plate meeting the thickness requirements is welded on the upper surface of the end of the reaction beam 12 to fix and support the steel roller. The tripod 3 adjusts the positions of the first reaction frame 7 and the second reaction frame 8 to meet the stroke requirements of the hydraulic jack 9, and applies force to the required prestress level through the hydraulic jack 9. When the required When the stress level is reached, tighten all the nuts to keep the stress level constant. Other components and connections are the same as those in the first embodiment.
具体实施方式四：结合图1说明本实施方式，本实施方式所述一种预应力FRP布加固钢筋混凝土桥梁的方法是通过如下步骤实现的：Specific embodiment four: illustrate this embodiment in conjunction with Fig. 1, the method for a kind of prestressed FRP sheet reinforcement reinforced concrete bridge described in this embodiment is realized through the following steps:
步骤一、在FRP布1上预浸环氧树脂，将预浸好的FRP布1的端头缠绕在方形空心梁5上，环氧树脂固化后将两个方形空心梁5通过固定螺栓6连接在一起组成锚固组件；Step 1. Pre-impregnate the epoxy resin on the FRP cloth 1, wrap the end of the pre-impregnated FRP cloth 1 on the square hollow beam 5, and connect the two square hollow beams 5 through the fixing bolt 6 after the epoxy resin is cured together to form an anchor assembly;
步骤二、锚固组件绕过三角支架3上端的钢滚轴4与三角支架3下端的张拉组件的第二螺纹锚杆14连接；Step 2, the anchor assembly bypasses the steel roller 4 at the upper end of the tripod 3 and connects with the second threaded anchor rod 14 of the tensioning assembly at the lower end of the tripod 3;
步骤三、在预应力张拉台座2的下表面与脚手架15之间并排设置两个千斤顶16；Step 3, two jacks 16 are arranged side by side between the lower surface of the prestressed tensioning pedestal 2 and the scaffold 15;
步骤四、启动张拉组件将FRP布1张拉到要求的应力水平后，在FRP布1上表面和钢筋混凝土梁17下表面涂抹环氧树脂胶；Step 4: After starting the tensioning component and pulling the FRP cloth 1 to the required stress level, apply epoxy glue on the upper surface of the FRP cloth 1 and the lower surface of the reinforced concrete beam 17;
步骤五、启动两个千斤顶16将预应力张拉台座2升起，使FRP布1与钢筋混凝土梁17贴合；Step five, start two jacks 16 to raise the prestressed tensioning pedestal 2, so that the FRP cloth 1 and the reinforced concrete beam 17 fit together;
步骤六、用注射器或者针头向FRP布1与钢筋混凝土梁17贴合处注射环氧树脂以除去贴合层中的气泡；Step 6: Inject epoxy resin into the joint between the FRP cloth 1 and the reinforced concrete beam 17 with a syringe or a needle to remove air bubbles in the joint layer;
步骤七、环氧树脂固化后，将两个千斤顶16撤除，从钢滚轴4处将多余的FRP布1剪除，完成加固。Step 7. After the epoxy resin is cured, the two jacks 16 are removed, and the excess FRP cloth 1 is cut off from the steel roller 4 to complete the reinforcement.
本发明的张拉过程为：在组装完成张拉组件后，高度调整合适后，旋紧所有螺母，保持液压千斤顶上面的第一反力架始终不动，通过液压千斤顶加力，使得压力传感器下面的第二反力架向下移动，同时带动空心锚固梁向下移动，达到张拉FRP布的目的，记录压力传感器的读数，当达到吨位后，即刻旋紧反力梁下面的螺母，以保持应力水平稳定不变。当液压千斤顶到达最大行程时仍没有达到要求的张拉吨位，此时，首先同样旋紧反力梁底部螺母，以保持当前应力水平稳定不变，之后千斤顶回油，之后向上旋动第二反力架下方的螺母，抬升反力架及千斤顶组件，进行液压千斤顶的复位，完成之后旋紧螺母，再次通过液压千斤顶加力来张拉FRP布，如上所述，直到张拉吨位达到要求，旋紧反力梁底部螺母，完成张拉。The tensioning process of the present invention is as follows: after the tensioning assembly is assembled and the height is adjusted properly, all the nuts are tightened to keep the first reaction frame above the hydraulic jack still, and the force is applied through the hydraulic jack to make the pressure sensor under the pressure sensor The second reaction frame moves downward, and at the same time drives the hollow anchor beam to move downward to achieve the purpose of stretching the FRP cloth, record the readings of the pressure sensor, and when the tonnage is reached, immediately tighten the nut under the reaction beam to maintain Stress levels remain constant. When the hydraulic jack reaches the maximum stroke and still does not reach the required tensioning tonnage, at this time, first tighten the nut at the bottom of the reaction beam to keep the current stress level stable, then the jack returns oil, and then rotate the second reaction beam upwards. Lift the nut under the force frame, lift the reaction force frame and the jack assembly, and reset the hydraulic jack. After the completion, tighten the nut, and then use the hydraulic jack to force the FRP cloth again. As mentioned above, until the tensioning tonnage reaches the requirement, turn Tighten the nuts at the bottom of the reaction beam to complete the tension.
本发明的粘贴过程为：整个预应力布的顶升粘贴是由放置在反力梁下部的两台千斤顶完成，反力梁支撑在脚手架上。在FRP布被张拉到要求的应力水平后，在布和混凝土表面上涂抹环氧树脂胶，整个张拉台座被液压千斤顶顶起，以使FRP布与混凝土表面贴合。用注射器或者针头注射环氧树脂以除去贴合层中的气泡。环氧树脂固化以后，撤掉千斤顶，放松螺纹锚杆，预应力就传递到梁上。从滚轴处剪断多余的FRP布，这部分多余的非预应力布可以用环氧树脂粘贴在梁上。The pasting process of the present invention is as follows: the jacking and pasting of the whole prestressed cloth is completed by two jacks placed on the lower part of the reaction beam, and the reaction beam is supported on the scaffold. After the FRP cloth is stretched to the required stress level, epoxy glue is applied on the cloth and the concrete surface, and the entire tensioning pedestal is lifted by a hydraulic jack to make the FRP cloth and the concrete surface adhere. Inject epoxy with a syringe or needle to remove air bubbles in the bonded layer. After the epoxy has cured, the jacks are removed, the threaded anchors are loosened, and the prestress is transferred to the beam. Cut the excess FRP fabric from the rollers, this part of the excess non-prestressed fabric can be glued to the beam with epoxy resin.
以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明，任何熟悉本专业的技术人员，在不脱离本发明技术方案范围内，当可利用上述揭示的技术内容做出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案内容，依据本发明的技术实质，在本发明的精神和原则之内，对以上实施例所作的任何简单的修改、等同替换与改进等，均仍属于本发明技术方案的保护范围之内。The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but as long as they do not depart from the technical solution of the present invention, according to the technical content of the present invention Within the spirit and principles of the present invention, any simple modifications, equivalent replacements and improvements made to the above embodiments still fall within the scope of protection of the technical solutions of the present invention.
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