CN106193643A - A kind of Prestressed CFRP plate stretching and anchoring device of reinforcing steel beam and combination beam - Google Patents
A kind of Prestressed CFRP plate stretching and anchoring device of reinforcing steel beam and combination beam Download PDFInfo
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- CN106193643A CN106193643A CN201610573744.1A CN201610573744A CN106193643A CN 106193643 A CN106193643 A CN 106193643A CN 201610573744 A CN201610573744 A CN 201610573744A CN 106193643 A CN106193643 A CN 106193643A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
- E04G2023/0262—Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off
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Abstract
本发明公开了一种加固钢梁及组合梁的预应力CFRP板张拉锚固装置，包括定位钢角、张拉钢角、锁紧螺母、导向螺杆、调节螺母、离合钢槽、穿心式千斤顶、定位挡板、钢角支座、高强螺栓。张拉钢角和钢角支座内部带有楔形夹片，利用摩擦力实现对CFRP板的夹持，安全、可靠、耐久，不依赖结构胶和化学锚栓。定位钢角、张拉钢角和钢角支座设有三角形加劲肋，以提高装置的强度和局部稳定性。千斤顶位于张拉装置的外侧，大幅减小了张拉施工纵向空间，并在张拉完成后可以很方便地拆除。本发明所提供的装置构造简单、力流明晰、施工便捷，充分发挥纤维材料的高强性能，拓展了预应力CFPR板加固技术的应用领域，可广泛应用于桥梁钢结构及组合结构加固工程。
The invention discloses a prestressed CFRP plate tensioning and anchoring device for reinforcing steel beams and composite beams, including positioning steel angles, tensioning steel angles, locking nuts, guide screws, adjusting nuts, clutch steel grooves, and through-hole jacks , positioning baffle, steel angle support, high-strength bolts. The tension steel angle and the steel angle support have wedge-shaped clips inside, which use friction to clamp the CFRP plate, which is safe, reliable and durable, and does not rely on structural adhesives and chemical anchors. The positioning steel angle, tension steel angle and steel angle support are equipped with triangular stiffeners to improve the strength and local stability of the device. The jack is located on the outside of the tensioning device, which greatly reduces the longitudinal space of the tensioning construction, and can be easily removed after the tensioning is completed. The device provided by the invention has simple structure, clear force flow, convenient construction, fully exerts the high-strength performance of fiber materials, expands the application field of prestressed CFPR plate reinforcement technology, and can be widely used in bridge steel structure and composite structure reinforcement projects.
Description
技术领域technical field
本发明属于桥梁钢结构及组合结构加固领域，涉及一种新型预应力CFRP板张拉锚固装置，尤其适用于工字形钢板梁桥和钢箱梁桥的加固设计和施工。The invention belongs to the field of bridge steel structure and composite structure reinforcement, and relates to a novel prestressed CFRP plate tension anchoring device, which is especially suitable for the reinforcement design and construction of I-shaped steel plate girder bridges and steel box girder bridges.
背景技术Background technique
碳纤维片材(Laminate)分为碳纤维布(Sheet)和碳纤维板(Plate)。由于碳纤维布加固量小且质量性能不稳定，逐渐被碳纤维板所取代。将“体外预应力技术”与“粘贴纤维复合材料加固技术”相结合，可以充分发挥材料的高强特性、有效延缓结构开裂、避免过早发生剥离破坏。由于设计理念的改进，该方法己成为国内纤维加固技术的主流。目前，该方法的适用对象尚局限于混凝土结构，相应的张拉、锚固装置也仅适用混凝土结构。Carbon fiber sheet (Laminate) is divided into carbon fiber cloth (Sheet) and carbon fiber plate (Plate). Due to the small amount of carbon fiber cloth reinforcement and unstable quality performance, it is gradually replaced by carbon fiber sheets. The combination of "external prestressing technology" and "adhesive fiber composite material reinforcement technology" can give full play to the high-strength properties of the material, effectively delay structural cracking, and avoid premature peeling damage. Due to the improvement of the design concept, this method has become the mainstream of domestic fiber reinforcement technology. At present, the applicable objects of this method are still limited to concrete structures, and the corresponding tensioning and anchoring devices are only applicable to concrete structures.
申请号为200910252181.6的发明专利涉及“一种采用预应力碳纤维板加固梁的方法及装置”，该方法有以下特点：1.其锚固装置是平板锚具，需要大量高强螺栓进行锚固装置的固定和碳纤维板的夹持，而钢结构的特点决定了不宜在其表面过多开孔；2.其张拉装置是对碳纤维板横向张拉，须在跨中增设锚固点，且在锚固点位置存在较大的竖向集中荷载，对被加固梁的局部受力不利；3.碳纤维板呈折线形布置，将会减小桥梁净空，且预应力水平越高净空损失量越大。The invention patent with the application number 200910252181.6 relates to "a method and device for strengthening beams with prestressed carbon fiber plates". The carbon fiber plate is clamped, and the characteristics of the steel structure determine that it is not suitable to open too many holes on its surface; 2. The tensioning device is to stretch the carbon fiber plate horizontally, and an anchor point must be added in the mid-span, and there is an anchor point at the anchor point. Larger vertical concentrated loads are unfavorable to the local stress of the reinforced beams; 3. The carbon fiber boards are arranged in a broken line, which will reduce the clearance of the bridge, and the higher the prestress level, the greater the clearance loss.
申请号为201410826947.8的发明专利申请涉及“一种预应力碳纤维板张拉装置及其用于预应力碳纤维板张拉的方法”，该方法有以下特点：1.锚具安装过程中，要求在混凝土表面切割挖槽，并使碳纤维板粘贴在结构表面，形成有黏结加固，该项技术不适用于加固钢梁或组合梁；2.通过螺纹杆传力，工具挡板带动张拉挡板产生位移，千斤顶和张拉端支座位于两侧挡板之间，致使张拉端施工空间较大；3.该装置的各个部件多为长方体，用钢量较大。The invention patent application with the application number 201410826947.8 relates to "a tensioning device for prestressed carbon fiber panels and its method for tensioning prestressed carbon fiber panels". The surface is cut and grooved, and the carbon fiber plate is pasted on the surface of the structure to form a bonded reinforcement. This technology is not suitable for strengthening steel beams or composite beams; 2. Through the threaded rod, the force is transmitted, and the tool baffle drives the tension baffle to generate displacement , The jack and the tension end support are located between the baffles on both sides, resulting in a larger construction space at the tension end; 3. The various parts of the device are mostly cuboids, and the amount of steel used is relatively large.
发明内容Contents of the invention
发明目的：本发明的目的在于提供一种加固钢梁及组合梁的预应力CFRP板张拉锚固装置，同时解决以下技术问题：1.锚具与CFRP板的连接方式不依赖结构胶和化学锚栓，以避免传统胶粘式锚具的耐久性问题和开孔钢板的应力集中问题；2.张拉、锚固装置主要由薄壁钢板构成，处于以受压为主的复杂应力状态，需保证局部稳定；3.优化各个部件的外形尺寸，以减小张拉实施空间、降低锚具生产成本。Purpose of the invention: the purpose of the present invention is to provide a prestressed CFRP plate tension anchoring device for reinforcing steel beams and composite beams, and solve the following technical problems at the same time: 1. The connection mode between the anchorage and the CFRP plate does not rely on structural glue and chemical anchors bolts to avoid the durability problems of traditional adhesive anchors and the stress concentration problems of perforated steel plates; Local stability; 3. Optimize the external dimensions of each component to reduce the space for tensioning and reduce the production cost of anchorage.
技术方案：为解决上述技术问题，本发明提供一种加固钢梁及组合梁的预应力CFRP板张拉锚固装置，包括预应力CFRP板张拉装置和锚固装置，所述张拉装置包括定位钢角、张拉钢角、锁紧螺母、导向螺杆、调节螺母、离合钢槽、穿心式千斤顶、定位挡板、楔形夹片和高强螺栓，所述锚固装置包括钢角支座、楔形夹片和高强螺栓。Technical solution: In order to solve the above technical problems, the present invention provides a prestressed CFRP plate tensioning and anchoring device for reinforcing steel beams and composite beams, including a prestressed CFRP plate tensioning device and an anchoring device, and the tensioning device includes positioning steel Angle, tension steel angle, lock nut, lead screw, adjusting nut, clutch steel channel, through-hole jack, positioning baffle, wedge-shaped clip and high-strength bolt, the anchoring device includes steel angle support, wedge-shaped clip and high-strength bolts.
所述定位钢角包括第一水平钢板和第一竖向钢板，所述第一竖向钢板与第一水平钢板之间设有直角三角形加劲肋，所述水平钢板上具有螺栓孔，所述第一竖向钢板上具有用于穿过导向螺杆的第一圆形孔道。所述定位钢角是横向分离布置的两块，每块第一竖向钢板上具有一个第一圆形孔道。The positioning steel angle includes a first horizontal steel plate and a first vertical steel plate, a right-angled triangle stiffener is provided between the first vertical steel plate and the first horizontal steel plate, bolt holes are provided on the horizontal steel plate, and the first A vertical steel plate has a first circular hole for passing the lead screw. The positioning steel angles are two pieces separated horizontally, and each first vertical steel plate has a first circular hole.
所述张拉钢角包括第二水平钢板和第二竖向钢板，所述第二竖向钢板与第二水平钢板之间设有直角三角形加劲肋，所述水平钢板与被加固梁滑动配合，可沿纵向自由移动，所述第二竖向钢板上具有用于穿过导向螺杆的第二圆形孔道。所述张拉钢角是横向整体布置的一块，所述第二圆形孔道的数量是两个。所述定位钢角和张拉钢角上均具有通槽，所述通槽与楔形夹片组成夹持式锚具。The tension steel angle includes a second horizontal steel plate and a second vertical steel plate, a right-angled triangle stiffener is provided between the second vertical steel plate and the second horizontal steel plate, and the horizontal steel plate is slidingly fitted with the reinforced beam, It can move freely along the longitudinal direction, and the second vertical steel plate has a second circular hole for passing through the lead screw. The tension steel angle is one piece arranged horizontally as a whole, and the number of the second circular tunnels is two. Both the positioning steel angle and the tensioning steel angle have through grooves, and the through grooves and wedge-shaped clips form clamping anchors.
具体地，所述的锁紧螺母是六角形螺母，位于导向螺杆的两端，分别锁死定位钢角和定位挡板。Specifically, the lock nut is a hexagonal nut, which is located at both ends of the lead screw and locks the positioning steel angle and the positioning baffle respectively.
具体地，所述导向螺杆是细长圆柱体，穿过定位钢角、张拉钢角、离合钢槽、穿心式千斤顶和定位挡板，所述定位钢角、离合钢槽和定位挡板所在区段的导向螺杆表面带外螺纹。Specifically, the guide screw is a slender cylinder, passing through the positioning steel angle, the tension steel angle, the clutch steel channel, the through-hole jack and the positioning baffle, and the positioning steel angle, the clutch steel channel and the positioning baffle are The lead screw surface of the section is externally threaded.
具体地，所述调节螺母是六角形螺母，位于离合钢槽内部。Specifically, the adjusting nut is a hexagonal nut located inside the clutch steel groove.
具体地，所述离合钢槽由板钢、槽钢两部分构成，二者依靠纵向顶推力结合，中间的圆形孔道用于穿过导向螺杆。Specifically, the clutch steel channel is composed of plate steel and channel steel, the two parts are combined by longitudinal thrust, and the circular hole in the middle is used to pass through the lead screw.
具体地，所述穿心式千斤顶采用一对小型液压千斤顶，位于离合钢槽与定位挡板之间。Specifically, the through-hole jack adopts a pair of small hydraulic jacks, which are located between the clutch steel channel and the positioning baffle.
具体地，所述定位挡板是带孔方形钢板，中间的圆形孔道用于穿过导向螺杆。Specifically, the positioning baffle is a square steel plate with holes, and the middle circular hole is used to pass through the lead screw.
具体地，所述楔形夹片是夹持在CFRP板上下表面的两块楔形体，张拉钢角和钢角支座上通槽作为穿设楔形体的楔形槽，楔形夹片的内表面涂抹有金刚砂；楔形夹片利用摩擦力实现对CFRP板的夹持。Specifically, the wedge-shaped clips are two wedge-shaped bodies clamped on the upper and lower surfaces of the CFRP plate, the tension steel angle and the through groove on the steel angle support are used as wedge-shaped grooves for piercing the wedge-shaped body, and the inner surface of the wedge-shaped clip is coated with There is emery; the wedge clip uses friction to clamp the CFRP plate.
具体地，所述钢角支座采用蛙式构造，通过高强螺栓与被加固梁连接，竖向钢板与水平钢板之间设有三角形加劲肋；所述钢角支座上具有用于安装楔形夹片的通槽。Specifically, the steel angle support adopts a frog-type structure, and is connected to the reinforced beam through high-strength bolts, and a triangular stiffener is provided between the vertical steel plate and the horizontal steel plate; Slots for slices.
本发明同时提供上述张拉装置的使用方法，包括以下步骤：The present invention simultaneously provides a method for using the tensioning device, comprising the following steps:
步骤1，利用高强螺栓将张拉装置和锚固装置分别安装在被加固梁的两端；Step 1, using high-strength bolts to install the tensioning device and the anchoring device at both ends of the reinforced beam;
步骤2，利用楔形夹片将CFRP板的两端夹持在张拉钢角和钢角支座上；Step 2, using wedge-shaped clips to clamp both ends of the CFRP plate on the tensioned steel angle and the steel angle support;
步骤3，利用穿心式千斤顶拉动导向螺杆，对CFRP板进行同步对称张拉；步骤4，当达到目标预应力后，通过旋紧调节螺母，定位钢角的夹持力从定位挡板传递到张拉钢角上；Step 3, use the through-hole jack to pull the guide screw, and perform synchronous and symmetrical tension on the CFRP plate; Step 4, when the target prestress is reached, by tightening the adjusting nut, the clamping force of the positioning steel angle is transferred from the positioning baffle to the On tensioned steel angle;
步骤5，穿心式千斤顶停止供油，纵向顶推力释放，离合钢槽内部挤压力消失，板钢和槽钢接触面分离；Step 5, the oil supply of the through-hole jack is stopped, the longitudinal jacking force is released, the internal extrusion force of the clutch steel channel disappears, and the contact surface of the plate steel and the channel steel is separated;
步骤6，将穿心式千斤顶从被加固梁上拆除。Step 6, remove the through jack from the reinforced beam.
有益效果：由于采用上述技术方案，与现有技术相比，本发明具有以下特点和有益效果：Beneficial effects: Due to the adoption of the above technical solution, compared with the prior art, the present invention has the following characteristics and beneficial effects:
1.解决了传统预应力CFRP板锚具在钢梁及钢-混凝土组合梁上的锚固问题，拓展了预应力CFRP板加固技术的应用领域；1. Solve the anchoring problem of traditional prestressed CFRP plate anchors on steel beams and steel-concrete composite beams, and expand the application field of prestressed CFRP plate reinforcement technology;
2.锚具与CFRP板之间的连接方式采用夹片式楔形锚，不依赖结构胶和化学锚栓，避免了传统胶粘式锚具的耐久性问题和开孔钢板的应力集中问题；2. The connection between the anchorage and the CFRP plate adopts a clip-type wedge anchor, which does not rely on structural adhesives and chemical anchors, avoiding the durability problems of traditional adhesive anchorages and the stress concentration problems of perforated steel plates;
3.锚具受力原理以机械夹持为主，锚固效率高、质量性能稳定，可充分发挥CFRP板的高强特性；3. The force principle of the anchor is mainly mechanical clamping, with high anchoring efficiency and stable quality and performance, which can give full play to the high-strength characteristics of CFRP plates;
4.钢角支座、定位钢角与被加固梁之间的连接方式采用高强螺栓，避免了采用焊接方法带来的疲劳隐患，高强螺栓数量精简、分布合理，避免薄壁钢板局部失稳；4. High-strength bolts are used for the connection between the steel angle support, the positioning steel angle and the reinforced beam, which avoids the fatigue hazard caused by the welding method. The number of high-strength bolts is reduced and the distribution is reasonable to avoid local instability of the thin-walled steel plate;
5.张拉、锚固装置的构造较多地运用了三角形加劲肋，以提高结构的承载力和稳定性，避免竖向钢板在强大预加力下发生弯曲；5. The structure of the tensioning and anchoring devices mostly uses triangular stiffeners to improve the bearing capacity and stability of the structure and avoid bending of the vertical steel plate under strong pre-stressing force;
6.千斤顶的顶推力不是直接作用在定位钢角上，而是通过导向螺杆作用在定位挡板上，力流的改变使得定位钢角与张拉钢角之间的距离大幅缩短；6. The jacking force of the jack does not directly act on the positioning steel angle, but acts on the positioning baffle through the guide screw. The change of force flow makes the distance between the positioning steel angle and the tensioning steel angle greatly shortened;
7.离合钢槽的存在使得锚固完成之后可以很方便地将千斤顶从张拉装置上拆除；7. The existence of the clutch steel channel makes it easy to remove the jack from the tensioning device after the anchoring is completed;
8.通过对张拉、锚固装置各个部件的外形尺寸进行优化，达到改善受力、降低造价的效果。8. By optimizing the external dimensions of each component of the tensioning and anchoring device, the effect of improving the force and reducing the cost is achieved.
除了上面所述的本发明解决的技术问题、构成技术方案的技术特征以及由这些技术方案的技术特征所带来的优点外，本发明的一种加固钢梁及组合梁的预应力CFRP板张拉锚固装置所能解决的其他技术问题、技术方案中包含的其他技术特征以及这些技术特征带来的优点，将结合附图做出进一步详细的说明。In addition to the above-mentioned technical problems solved by the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of these technical solutions, the prestressed CFRP sheet tensioning of a reinforced steel beam and a composite beam of the present invention Other technical problems that can be solved by the pulling anchor device, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings.
附图说明Description of drawings
图1是本发明实施例中张拉锚固装置与被加固梁的整体结构示意图；Fig. 1 is a schematic diagram of the overall structure of a tension anchoring device and a reinforced beam in an embodiment of the present invention;
图2是图1的仰视图；Fig. 2 is the bottom view of Fig. 1;
图3是图1的结构简图；Fig. 3 is a schematic structural diagram of Fig. 1;
图4是图1中定位钢角的结构示意图；Fig. 4 is the structural representation of positioning steel angle in Fig. 1;
图5是图1中张拉钢角的结构示意图；Fig. 5 is the structural representation of tension steel angle in Fig. 1;
图6是图1中钢角支座的结构示意图；Fig. 6 is a schematic structural view of the steel angle support in Fig. 1;
图7是图1中离合钢槽的结构示意图；Fig. 7 is a schematic structural view of the clutch steel channel in Fig. 1;
图8是图7的装配图；Fig. 8 is the assembly drawing of Fig. 7;
图中，1被加固梁，2定位钢角，3张拉钢角，4锁紧螺母，5导向螺杆，6调节螺母，7离合钢槽，7-1板钢，7-2槽钢，8穿心式千斤顶，9定位挡板，10碳纤维板，11钢角支座，12高强螺栓。In the figure, 1 beam to be reinforced, 2 positioning steel angle, 3 tension steel angle, 4 lock nut, 5 guide screw, 6 adjusting nut, 7 clutch steel channel, 7-1 plate steel, 7-2 channel steel, 8 Through-hole jack, 9 positioning baffles, 10 carbon fiber plates, 11 steel angle supports, 12 high-strength bolts.
具体实施方式detailed description
实施例：Example:
本实施例的一种加固钢梁及钢-混凝土组合梁的预应力CFRP板张拉锚固装置如图1、图2和图3所示，包括定位钢角2、张拉钢角3、锁紧螺母4、导向螺杆5、调节螺母6、离合钢槽7、穿心式千斤顶8、定位挡板9、钢角支座11、高强螺栓12。楔形夹片分别位于张拉钢角3和钢角支座11的内部，嵌固其中形成整体。A prestressed CFRP plate tension anchoring device for reinforced steel beams and steel-concrete composite beams of this embodiment is shown in Figure 1, Figure 2 and Figure 3, including a positioning steel angle 2, a tensioning steel angle 3, and a lock nut 4 , Lead screw rod 5, adjusting nut 6, clutch steel channel 7, through-heart jack 8, positioning baffle 9, steel angle support 11, high-strength bolt 12. The wedge-shaped clips are respectively located inside the tension steel angle 3 and the steel angle support 11, and are embedded in them to form a whole.
张拉装置、锚固装置的固定分别由定位钢角2、钢角支座11实现，二者通过高强螺栓12与被加固梁1连接。定位钢角2在横向是分离式的，以便于夹持和安装，需沿两侧对称布置。张拉钢角3在横向是整体式的，可保证碳纤维板10在张拉过程中做同步位移。张拉钢角3与被加固梁1下翼缘的接触面光滑，在预加力下可沿纵向移动，在张拉完成后将纵向自由度锁死。The fixing of the tensioning device and the anchoring device is respectively realized by the positioning steel angle 2 and the steel angle support 11, and the two are connected with the beam 1 to be reinforced by high-strength bolts 12. The positioning steel angle 2 is separated in the transverse direction, so as to facilitate clamping and installation, and it needs to be arranged symmetrically along both sides. The tensioning steel angle 3 is integral in the transverse direction, which can ensure that the carbon fiber plate 10 is displaced synchronously during the tensioning process. The contact surface between the tensioned steel angle 3 and the lower flange of the reinforced beam 1 is smooth, and can move longitudinally under pre-stressing, and lock the longitudinal degree of freedom after the tensioning is completed.
如图4、图5和图6所示，定位钢角2、张拉钢角3与钢角支座11采用高强度合金钢精铸成型。定位钢角2与张拉钢角3的纵向距离根据预应力水平、材料伸长率确定。定位钢角2、张拉钢角3与钢角支座11均设有三角形加劲肋，以防止竖向钢板在强大预加力作用下发生弯曲。张拉钢角3、钢角支座11与碳纤维板10的接触面需经丙酮溶液清洗和喷气除尘。导向螺杆5的两端附近带外螺纹。定位钢角2、定位挡板9通过锁紧螺母4固定于导向螺杆5的两端。As shown in Fig. 4, Fig. 5 and Fig. 6, the positioning steel angle 2, the tensioning steel angle 3 and the steel angle support 11 are formed by precision casting of high-strength alloy steel. The longitudinal distance between the positioning steel angle 2 and the tensioning steel angle 3 is determined according to the prestress level and material elongation. The positioning steel angle 2, the tensioning steel angle 3 and the steel angle support 11 are all provided with triangular stiffeners to prevent the vertical steel plate from bending under the strong pre-stressing force. The contact surfaces of the tensioned steel angle 3, the steel angle support 11 and the carbon fiber plate 10 need to be cleaned with acetone solution and dedusted by air jet. Near the two ends of lead screw rod 5, there are external threads. The positioning steel angle 2 and the positioning baffle plate 9 are fixed on the two ends of the lead screw rod 5 through the lock nut 4 .
张拉钢角3、钢角支座11与碳纤维板10的连接均由楔形夹片实现。楔形夹片包括上下两片，分别楔入张拉钢角3、钢角支座11相互挤压共同受力。楔形夹片内表面涂抹金刚砂以提供足够的摩擦。The tension steel angle 3, the connection of the steel angle support 11 and the carbon fiber plate 10 are all realized by wedge clips. The wedge-shaped clip includes two upper and lower pieces, which are respectively wedged into the tension steel angle 3 and the steel angle support 11 to be squeezed together to bear force together. The inner surface of the wedge clip is coated with emery to provide sufficient friction.
如图7和图8所示，离合钢槽7由板钢7-1和槽钢7-2两部分构成，二者依靠纵向顶推力结合，当顶推力消失后接触面分离。调节螺母位于离合钢槽7内部，张拉过程中呈放松状态，张拉完成后再手工旋紧。As shown in Fig. 7 and Fig. 8, the clutch steel channel 7 is composed of plate steel 7-1 and channel steel 7-2. The adjusting nut is located inside the clutch steel channel 7, and is in a relaxed state during the tensioning process, and is manually tightened after the tensioning is completed.
本发明张拉结束阶段的主要步骤说明如下：The main steps of the stretching end stage of the present invention are described as follows:
当达到目标预应力后，通过旋紧调节螺母4，定位钢角2的夹持力从定位挡板9传递到张拉钢角3上。此后穿心式千斤顶8停止供油，纵向顶推力释放，离合钢槽7内部挤压力消失，板钢和槽钢接触面分离，即可很方便地将穿心式千斤顶8从被加固梁1上拆除。When the target prestress is reached, the clamping force of the positioning steel angle 2 is transferred from the positioning baffle 9 to the tensioning steel angle 3 by tightening the adjusting nut 4 . Thereafter, the oil supply of the through-type jack 8 is stopped, the longitudinal jacking force is released, the internal extrusion force of the clutch steel channel 7 disappears, and the contact surface of the plate steel and the channel steel is separated, so that the through-type jack 8 can be easily removed from the reinforced beam 1 removed.
应注意，实施例中的方案并非用以限制本发明的专利保护范围，凡未脱离本发明所为的等效实施或变更，均包含于本案的专利范围中。It should be noted that the schemes in the embodiments are not intended to limit the scope of patent protection of the present invention, and all equivalent implementations or changes that do not depart from the scope of the present invention are included in the patent scope of this case.
Claims (8)
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| CN114809704A (en) * | 2022-05-24 | 2022-07-29 | 重庆达力索缆科技有限公司 | Tightening type external prestress CFRP material reinforcing system and construction method |
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| CN116927515A (en) * | 2023-09-14 | 2023-10-24 | 北京市建筑工程研究院有限责任公司 | Auxiliary device for resisting accumulated fatigue fracture of steel beam and use method |
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| US12234661B1 (en) | 2023-12-26 | 2025-02-25 | Fujian University Of Technology | Automatic leveling carbon fiber reinforced polymer (CFRP) plate pre-stressing and tensioning devices for curved surface structures |
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