Prestress anchoring device and concrete structure construction method

Abstract

The invention relates to the technical field of concrete construction, and discloses a prestressed anchoring device and a concrete structure construction method.The prestressed anchoring device comprises a pre-buried part, a fixing part and a tensioning part; wherein the pre-buried part is pre-buried in the bottom layer concrete part, and positioning rods extending out of the bottom layer concrete part are formed at the two ends of the pre-buried part; the fixed part is fixedly connected to the positioning rod at one end, a self-locking anchorage device is fixedly arranged on the fixed part, and the self-locking anchorage device comprises a fixed frame, a first cloth rolling shaft and a second cloth rolling shaft, and the first cloth rolling shaft and the second cloth rolling shaft are arranged on the fixed frame in parallel; the tensioning part is fixedly connected to the positioning rod at the other end, the self-locking anchorage device is arranged on the tensioning part, and a fixing frame of the self-locking anchorage device is connected with a tensioning rod of the tensioning part. When the prestressed anchoring device is used for constructing a concrete structure, the carbon fiber cloth and the carbon fiber gridding cloth can be fixed so that the carbon fiber cloth and the carbon fiber gridding cloth can be tensioned, and the concrete structure which is not prone to warping and cracking is obtained.

Description

Technical Field

[0001] This invention relates to the field of concrete construction technology, specifically to a prestressed anchoring device and a method for constructing concrete structures. Background Technology

[0002] Cracking in colored concrete pavements used in theme parks not only poses safety risks but also negatively impacts the visitor experience. Due to temperature and humidity differences between day and night, the pavement repeatedly warps and buckles, creating fatigue stress. Uneven foundation settlement can also cause the bottom of the pavement to become hollow, leading to self-weight stress. When the sum of fatigue stress, self-weight stress, and other destructive stresses exceeds the pavement's inherent stress, cracks will form, severely affecting its performance. Therefore, prestressed reinforcement to prevent cracking in colored concrete pavements is crucial.

[0003] A Chinese patent (publication number: CN214459755U) discloses a prestressed anchoring device for concrete bridges. It includes a rectangular frame, a fixing part, a tensioning part, and carbon fiber cloth. Waist-shaped through holes are opened on both sides of the rectangular frame, and the tensioning part is slidably installed along the length of the rectangular frame. The fixing part is anchored to the bridge construction surface. Both the fixing and tensioning parts include clamping components, which include a cloth-clamping shaft and a fixing base. The fixing base clamps the spliced ​​cloth-clamping shaft and restricts the circumferential rotation of the two cloth-clamping shafts. The tensioning part also includes a tensioning top plate, with jacks installed between the tensioning top plate and the inner side of the rectangular frame. The jacks push the tensioning top plate, which in turn moves the clamping components of the tensioning part along the length of the rectangular frame, tensioning the carbon fiber cloth into position. Anchor bolts are tightened through the anchor holes, anchoring the clamping components of the tensioning part to the bridge construction surface. This effectively solves the problems of complex structure, cumbersome construction, difficulty in guaranteeing the tensile strength of the carbon fiber cloth, and low construction efficiency of existing carbon fiber cloth tensioning anchors. However, this product has the following drawbacks:

[0004] 1. This product can only be used for prestressing carbon fiber cloth, not carbon fiber mesh cloth; 2. The direction of the carbon fiber cloth in the tensioning section of this product is not on the same horizontal line as the direction of prestressing force, so the resulting eccentric moment can only be balanced by the rectangular frame, and cannot be tensioned by the tensioning section alone; 3. This product can only be used for prestressed reinforcement of concrete bridges, not for prestressed reinforcement of concrete slabs; 4. After the tensioning section of this product is wrapped with carbon fiber cloth, the installation with the rectangular frame is complicated; 5. The rectangular frame of this product is large and not easy to move and install. Summary of the Invention

[0005] The present invention was made to solve the above-mentioned technical problems. One of its objectives is to provide a prestressed anchoring device that can fix carbon fiber cloth and carbon fiber mesh cloth so as to tension them.

[0006] Another objective of this invention is to provide a concrete structure construction method that utilizes the aforementioned prestressed anchoring device to obtain a concrete structure that is less prone to warping and cracking.

[0007] According to one embodiment of the present invention, a prestressed anchoring device is provided, comprising an embedded part, a fixing part, and a tensioning part; wherein the embedded part is embedded in a bottom concrete layer, and positioning rods extending beyond the bottom concrete layer are formed at both ends; the fixing part is fixedly connected to the positioning rod at one end, and a self-locking anchor is fixedly disposed thereon, the self-locking anchor comprising a fixing frame and a first and a second fabric roll shaft arranged parallel thereon; the tensioning part is fixedly connected to the positioning rod at the other end, and the self-locking anchor is disposed thereon, the fixing frame of the self-locking anchor being connected to the tensioning rod of the tensioning part.

[0008] In one embodiment, the two ends of the first roll shaft are fixedly or slidably mounted on the fixed frame; the two ends of the second roll shaft are fixedly or slidably mounted on the fixed frame.

[0009] In one embodiment, the fixing frame has a through hole through which the tension rod can pass, and the through hole is in the same plane as the upper or lower side of the first roll shaft and the second roll shaft.

[0010] In one embodiment, the middle part of the first roll and the second roll are flat, and the front and rear ends are curved.

[0011] As one embodiment, the pre-embedded part includes: two positioning embedded plates, respectively disposed at both ends of the bottom concrete part; several steel bars, both ends of which are fixedly connected to the positioning embedded plates; wherein the lower end of the positioning rod is fixedly connected to the positioning embedded plate, and the upper end of the positioning rod is formed with external threads.

[0012] In one embodiment, the fixing part includes a first bracket bolted to the positioning rod, and the first bracket is provided with a connecting rod that is fixedly connected to the self-locking anchor.

[0013] In one embodiment, the tensioning section includes: a second bracket bolted to the positioning rod, on which the tensioning rod is threaded; a reaction plate fixedly connected to the end of the tensioning rod away from the self-locking anchor; a fixing nut threadedly connected to the tensioning rod and located on the side of the second bracket away from the self-locking anchor; and a jack with its two ends connected to the second bracket and the reaction plate, respectively.

[0014] In one embodiment, the jack, tension rod, and connecting rod are in the same plane, and are in the same plane as the upper or lower side of the first and second fabric roll shafts.

[0015] As one implementation, a pressure sensor is also provided between the jack and the reaction plate.

[0016] According to one embodiment of the present invention, a method for constructing a concrete structure is provided, employing the prestressed anchoring device as described above. The concrete structure includes a bottom concrete section and a top concrete section. The construction method includes: setting the embedded part during the construction of the bottom concrete section, with connecting steel bars and the positioning rod reserved on the upper end face of the bottom concrete section; after the bottom concrete section reaches a preset strength, installing the fixing part and the tensioning part on the positioning rod; after fully impregnating the prestressed fabric with epoxy resin, before the resin solidifies, wrapping the two ends with the self-locking anchors for self-locking, and moving the self-locking anchors of the tensioning part to make the prestressed fabric horizontal; after the resin on the prestressed fabric solidifies, tensioning the tensioning part to make the prestressed fabric reach a preset stress, and then fixing the self-locking anchors of the tensioning part; constructing the top concrete section at the prestressed fabric location, and after the top concrete section reaches a preset strength, removing the fixing part and the tensioning part.

[0017] Based on the above description and practice, the prestressed anchoring device of this invention uses a self-locking anchor. Two parallel fabric rollers are set in the fixing frame. During use, the prestressed fabric is sequentially wound around these two rollers. When the prestressed fabric is tensioned, the friction between the inner and outer layers of fabric on the rollers, as well as the friction between the fabric and the rollers, secures the prestressed fabric. Traditional clamping fabric clamps can form sufficient contact area with the carbon fiber fabric during operation, but not with the carbon fiber mesh fabric. Directly clamping and fixing the carbon fiber mesh fabric can easily cause it to break. However, the prestressed anchoring device of this invention uses the friction between the fabric layers and between the fabric and the rollers to secure the fabric, preventing breakage. This prestressed anchoring device allows for the placement of prestressed fabric such as carbon fiber mesh fabric within concrete slabs during construction, thereby increasing the strength of the concrete slab and preventing warping and cracking during use. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a prestressed anchoring device according to one embodiment of the present invention.

[0019] Figure 2 This is a top view of a prestressed anchoring device according to one embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of a self-locking anchor involved in one embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of two self-locking anchors involved in a one embodiment of the present invention during the tensioning of fabric.

[0022] Figure 5 for Figure 4 A schematic diagram of the AA section.

[0023] Figure 6 This is a detailed illustration of the self-locking anchor, the second bracket, and the reaction plate involved in one embodiment of the present invention.

[0024] Figure 7a and Figure 7b This is a three-dimensional structural diagram of the pre-embedded part in the prestressed anchoring device according to one embodiment of the present invention, viewed from two different perspectives.

[0025] Figure 7c This is a schematic diagram of the pre-embedded part of the prestressed anchoring device in one embodiment of the present invention after it has been installed in the bottom concrete part.

[0026] Figure 8 This is a schematic diagram of a prestressed anchoring device involved in one embodiment of the present invention during the tensioning of prestressed fabric.

[0027] Figure 9 This is a schematic diagram of a prestressed anchoring device involved in the construction of the top layer of concrete in one embodiment of the present invention.

[0028] Figure 10 This is a schematic diagram of the setup of strain gauges for testing prestressed concrete structure construction methods according to one embodiment of the present invention.

[0029] Figure 11 This is a schematic diagram illustrating the testing of concrete structure warpage in a concrete structure construction method according to one embodiment of the present invention.

[0030] The attached figures are labeled as follows:

[0031] 1. Prestressed anchoring device; 101. First roll of fabric shaft; 102. Second roll of fabric shaft; 103. Fixing frame; 2. Second support; 3. Reaction plate; 4. Steel bar; 5. Positioning embedded plate; 6. Positioning rod; 7. Connecting rod; 8. Fixing nut; 9. Jack; 10. Pressure sensor; 11. Tensioning part; 12. Fixing part; 13. Embedded part; 14. Extension direction of prestressed fabric; 15. Extension direction of tension rod; 16. Top layer concrete part; 17. Bottom layer concrete part; 18. Connecting steel bar; 19. Prestressed fabric; 20. Tension rod; 21. First support. Detailed Implementation

[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0033] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0034] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] According to one embodiment of the present invention, a prestressed anchoring device is provided, please refer to... Figures 1 to 9 The prestressed anchoring device includes a pre-embedded part 13, a fixing part 12, and a tensioning part 11.

[0036] The pre-embedded part 13 is embedded in the bottom concrete part 17, and positioning rods 6 extending out of the bottom concrete part 17 are formed at both ends. The fixed part 12 is fixedly connected to the positioning rod 6 at one end, and a self-locking anchor 1 is fixedly installed thereon. The tensioning part 11 is fixedly connected to the positioning rod 6 at the other end, and a self-locking anchor 1 is installed thereon.

[0037] The self-locking anchor 1 includes a fixing frame 103, a first fabric roll 101, and a second fabric roll 102. Both ends of the first fabric roll 101 are connected to the fixing frame 103, and both ends of the second fabric roll 102 are connected to the fixing frame 103 and are arranged parallel to the first fabric roll 101. The self-locking anchor 1 of the tensioning section 11 is connected to the tensioning rod 20. Specifically, the tensioning rod 20 is connected to the fixing frame 103. Movement of the tensioning rod 20 can move the self-locking anchor 1, thereby tensioning the prestressed fabric 19 between the two self-locking anchors 1.

[0038] The function of the fixing frame 103 is to arrange the two fabric rolls in parallel to ensure that the fabric can be securely wound onto the rolls. Therefore, in this embodiment, the fixing frame 103 only includes two opposing rods. In other embodiments, other structures, such as a plate connecting the two rods, can be added to improve the structural strength of the fixing frame 103.

[0039] This prestressed anchoring device can be applied during the construction of prestressed concrete structures, which incorporate prestressed fabric 19, such as carbon fiber cloth or carbon fiber mesh, to improve the strength of the concrete structure and prevent warping and cracking during use. The prestressed anchoring device is used to tension the prestressed fabric 19 before pouring concrete.

[0040] When constructing a prestressed concrete structure using this prestressed anchoring device, the concrete structure needs to be divided into two parts: a bottom concrete part 17 and a top concrete part 16. The bottom concrete part 17 is used to embed the pre-embedded part 13 of the device, and the top concrete part 16 is used to accommodate the prestressed cloth 19. Several connecting steel bars 18 are provided between the two concrete structures to achieve effective transfer of prestress and improve the bonding strength between the two.

[0041] When using this prestressed anchoring device, the pre-embedded part 13 is first embedded in the bottom concrete part 17. The positioning rods 6 at both ends extend outside the bottom concrete part 17, respectively used to set the fixing part 12 and the tensioning part 11. The self-locking anchor 1 of the fixing part 12 is in a fixed state, and the self-locking anchor 1 of the tensioning part 11 can move laterally during the tensioning process, thereby tensioning the prestressed fabric between the two self-locking anchors 1 to generate prestress. Then, a formwork can be erected around the prestressed fabric 19 and concrete can be poured to form the top concrete part 16 with prestress. Through this prestressed anchoring device, prestressed fabric such as carbon fiber mesh can be set inside the concrete floor during construction, thereby improving the strength of the concrete slab and preventing warping and cracking during use. Furthermore, the prestressed fabric will not be clamped and broken during construction.

[0042] like Figure 4 and Figure 5 As shown, two self-locking anchors 1 are used to fix and tension the strip of fabric. One end of the fabric is cross-wound around the first roll 101 and the second roll 102. The second roll 102 at the inner end has only one layer of fabric on its outer periphery, while the first roll 101 at the outer end has two layers of fabric. When the two self-locking anchors 1 are pulled to both sides, the fabric is fixed by the friction between the inner and outer layers of fabric on the fabric shaft and the friction between the fabric and the fabric shaft. This method of fixing the fabric by friction is less likely to cause fabric breakage compared to clamping methods, and therefore can be used to tension fabrics with sparse fiber distribution, such as carbon fiber mesh.

[0043] In this embodiment, both ends of the first fabric roll 101 are fixedly connected to the fixing frame 103, and both ends of the second fabric roll 102 are fixedly connected to the fixing frame 103, which can stably fix the ends of the fabric during use. In other embodiments, either or both of the two fabric rolls can be slidably connected to the fixing frame 103, so that the distance between the two fabric rolls can be adjusted when winding the fabric, making it easier to wind the fabric onto the two fabric rolls.

[0044] As one implementation, the fixing frame 103 has a through hole through which the tensioning rod can pass. The through hole is in the same plane as the upper or lower side of the first roll of fabric 101 and the second roll of fabric 102. When the two self-locking anchors 1 are stretched by the tensioning rod to gradually tighten the fabric, the tension force is in the same plane as the extension direction of the fabric, and there will be no eccentric torque, ensuring that the tensioning process can be carried out smoothly.

[0045] As one implementation, the middle part of the first roll 101 and the second roll 102 is flat, and the front and rear ends are curved. The fabric can have a large contact area when wrapped around the two rolls, which can improve the friction during tensioning, and the fabric is not easy to break in the anchor.

[0046] As one implementation method, such as Figure 7a and Figure 7b As shown, the embedded part 13 includes two positioning plates 5, several steel bars 4, and positioning rods 6. The two positioning plates 5 are respectively positioned at both ends of the bottom concrete part 17. The steel bars 4 are positioned between the two positioning plates 5, with both ends fixedly connected to the positioning plates 5. Only one steel bar 4 is shown in the figure; in practical applications, the number of steel bars 4 can be adjusted according to the width of the bottom concrete part 17 to ensure that the embedded part 13 remains secure during tensioning. The lower end of the positioning rod 6 is bolted to the positioning plates 5 at both ends, and the upper end extends to the outside of the bottom concrete part 17 with external threads for easy connection to the fixing part 12 and the tensioning part 11. The steel bars 4 effectively reduce the warping of the bottom concrete part 17.

[0047] As one implementation method, such as Figure 1 As shown, the fixing part 12 also includes a first bracket 21 bolted to the positioning rod 6. The first bracket 21 is provided with a connecting rod 7 that is fixedly connected to the self-locking anchor 1. The connecting rod 7 can be a threaded rod, with its two ends passing through the self-locking anchor 1 and the first bracket 21 respectively. The self-locking anchor 1 and the first bracket 21 can then be firmly connected together by bolts, which also facilitates the assembly of the fixing part 12.

[0048] As one implementation method, such as Figure 1 , Figure 2 and Figure 6 As shown, the tensioning section 11 also includes a second support 2, tension rods 20, a reaction plate 3, a fixing nut 8, and a jack 9. The second support 2 has a similar structure to the first support 21 and is used to connect to the positioning rod 6, for example, by bolting it to the positioning rod 6 at the other end. Two tension rods 20 are inserted into the second support 2, one end connected to the self-locking anchor 1, and the other end equipped with the reaction plate 3. The fixing nut 8 is threaded onto the tension rod 20 and located on the side of the second support 2 away from the self-locking anchor 1, used to fix the tension rod 20 to the second support 2 after tensioning is complete. Figure 1 As shown, the tension rod 20 is a threaded rod, with both ends passing through the self-locking anchor 1 and the reaction plate 3, and each end is equipped with a nut. The jack 9 has its two ends abutting against the second support 2 and the reaction plate 3, respectively. When the jack 9 applies force, it pushes the reaction plate 3 towards... Figure 1 When the left end moves, it can subsequently drive the self-locking anchor 1 of the tensioning part 11 to move to the left end, so that the prestressed cloth between the two self-locking anchors 1 is in a prestressed state.

[0049] Furthermore, a pressure sensor 10 is installed between the jack 9 and the reaction plate 3 to monitor the magnitude of the tension force in real time.

[0050] In one implementation, the jack 9, tension rod 20, and connecting rod 7 are all in the same plane, and also in the same plane as the upper or lower sides of the first roll of fabric 101 and the second roll of fabric 102. Therefore, during tensioning, the tensioning force is in the same plane as the tension rod 20, connecting rod 7, and prestressed fabric, and no eccentric moment occurs during the entire process, ensuring that the construction process can be completed smoothly and quickly.

[0051] Taking prestressed fabric 19 as a carbon fiber mesh as an example, the method of using this prestressed anchoring device is explained. First, the embedded part 13 is set in the bottom concrete part 17. Then, the carbon fiber mesh is impregnated with adhesive. Before the adhesive dries, the self-locking anchor 1 is wrapped around it. The specific wrapping method is as follows: Figure 3As shown. After the self-locking anchors 1 at both ends are wrapped with carbon fiber mesh, they are placed on the bottom concrete section 17. The fixing part 12 and the tensioning part 11 are respectively connected to the positioning rods 6 at both ends. The first bracket 21 and the second bracket 2 of the fixing part 12 and the tensioning part 11 are bolted to the positioning rods 6, and their positions are consistent vertically. The direction in which the carbon fiber mesh extends after being wrapped around the self-locking anchor 1 is aligned with the center line passing through the tensioning rod 20. The jack 9 pushes the reaction plate 3 to move. The reaction plate 3 drives the self-locking anchor 1 of the tensioning part 11 through the tensioning rod 20. The self-locking anchor 1 drives the carbon fiber mesh to be tensioned along its length. The pressure sensor 10 is used to observe the value until the carbon fiber mesh is tensioned to the correct position. The fixing nut 8 behind the second bracket 2 is tightened, and the jack 9 is depressurized. At this time, the fixing nut 8 can restrict the self-locking anchor 1 from moving to the initial position. After the upper concrete structure is poured and reaches its strength, the fixing nut 8 behind the second support 2 is loosened, the carbon fiber mesh cloth that is exposed outside the concrete is cut off, and the self-locking anchor 1, the fixing part 12 and the tensioning part 11 and other components are removed for reuse.

[0052] This prestressed anchoring device can prestress not only carbon fiber cloth but also carbon fiber mesh cloth, minimizing the risk of breakage at the fixed points during tensioning. During tensioning, the extension direction of the carbon fiber cloth at the tensioning end is aligned with the direction of prestressing force, eliminating the need for additional devices to balance eccentric moments; the tensioning end is consistent with the fixed end. Furthermore, this device can be used not only for prestressed reinforcement of concrete slabs but also for prestressed reinforcement of bridges. The device is simple to construct, requires no additional fixing frame, is small in size, highly feasible, widely applicable, and easy to operate, significantly improving work efficiency.

[0053] According to one embodiment of the present invention, a method for constructing a concrete structure is provided, employing the prestressed anchoring device described above, wherein the concrete structure includes a bottom concrete portion and a top concrete portion. The method for constructing the concrete structure includes the following steps:

[0054] Step S1: When constructing the bottom concrete part 17, a pre-embedded part 13 is set up, and a connecting steel bar 18 and a positioning rod 6 are reserved on the upper end face of the bottom concrete part 17.

[0055] Specifically, after leveling the base layer, a layer of polyethylene plastic film is laid, and then... Figure 1 After the pre-embedded part 13 enclosed by the dashed line is assembled, it is placed on a polyethylene plastic film. Concrete formwork is erected around the pre-embedded part 13, and the bottom concrete part 17 is poured, as shown in Figure 7. The connecting steel bar 18 and the positioning rod 6 are exposed for a certain length.

[0056] Step S2: After the bottom concrete part 17 reaches the preset strength, install the fixing part 12 and the tensioning part 11 on the positioning rod 6.

[0057] Specifically, after the bottom concrete section has been aged for 7 days, the first support and the second support 2 are installed on the bottom concrete section 17. The self-locking anchor 1 in the fixed section 12 is installed on the first support through the connecting rod 7. The self-locking anchor 1 of the tensioning section 11 is installed on the second support 2 through the tensioning rod 20. Then, the reaction plate 3 and the jack 9 are installed at the other end of the tensioning rod 20.

[0058] Step S3: After the prestressed cloth 19 is fully impregnated with epoxy resin, before the resin has solidified, the two ends are wrapped with self-locking anchors 1 for self-locking. Move the self-locking anchors 1 of the tensioning part 11 to make the prestressed cloth 19 horizontal.

[0059] Specifically, carbon fiber mesh fabric is cut to the same length as the gap between the two rolls of fabric of the self-locking anchor 1. After being fully impregnated with epoxy resin, the two ends are wrapped around the self-locking anchor 1 before the resin hardens to achieve self-locking. This ensures that the length after self-locking can be placed between the two first supports and the second support 2, while leaving a certain tensioning distance. The tension rod 20 is moved to bring the carbon fiber mesh fabric to a horizontal position. Three nuts are used to fix the tension rod 20 at each end, and the nuts are tightened with a wrench.

[0060] Step S4: After the adhesive on the prestressed cloth 19 has solidified, tension the tensioning part 11 so that the prestressed cloth 19 reaches the preset stress, and then fix the self-locking anchor 1 of the tensioning part 11.

[0061] Specifically, after the epoxy resin dries, pressure is applied to jack 9, which pushes the reaction plate 3 to move. The reaction plate 3, through the tension rod 20, drives the self-locking anchor 1 of the tensioning part 11. The self-locking anchor 1 drives the carbon fiber mesh cloth to be tensioned along its length. The pressure sensor 10 is used to monitor the pressure. When the force reaches the preset value, pressure is stopped, and the fixing nut 8 behind the second bracket 2 at the tensioning end is tightened to lock the force. The pressure on jack 9 is then released, and jack 9 and the force sensor are removed.

[0062] Step S5: Construct the top layer concrete portion 16 at the prestressed fabric 19. After the top layer concrete portion 16 reaches the preset strength, remove the fixing portion 12 and the tensioning portion 11.

[0063] Specifically, a concrete formwork is erected between the two self-locking anchors 1 on the left and right, and the top layer of concrete 16 is poured, as follows: Figure 9As shown. After a 7-day curing period, use a wrench to loosen the fixing nut 8 behind the second support 2 to relieve the force, thereby forming prestress inside the top concrete section 16. Cut off the exposed carbon fiber mesh on the outside of the concrete with an angle grinder, and remove the self-locking anchor 1, the first support, the second support 2, the reaction plate 3, the tension rod 20, etc., for reuse.

[0064] As one implementation method, in this concrete structure construction method, the carbon fiber mesh is also tested. After the carbon fiber mesh is impregnated with epoxy resin and dried, three strain gauges are attached to the left, center, and right sides of the middle section of the carbon fiber mesh and the two ends adjacent to the self-locking anchor, respectively. Figure 10 As shown, this method is used to detect the uniformity of stress distribution and stress hysteresis at various points on the carbon fiber mesh during prestressing tensioning. It also monitors the reduction in strain of the fiber mesh at the moment of stress release. After the upper layer of concrete is poured, the stress at each point is continuously monitored, and the prestress loss over time is observed to determine the actual force applied to the carbon fiber mesh. It should be noted that after the strain gauges are attached to the surface of the carbon fiber mesh, insulating adhesive is applied to the surface of the strain gauges to isolate them from external influences. Therefore, the subsequent pouring process will not affect the strain gauges. The strain gauges themselves are very small, serving only a monitoring function, and their impact on the concrete itself is negligible.

[0065] As one implementation method, the warping changes of the bottom and top concrete sections are also monitored in this concrete structure construction method. Before tensioning the carbon fiber mesh, an infrared laser level is used to mark a horizontal line on the side of the bottom concrete section, and the distances from the top of the slab to the two ends and the middle horizontal line are recorded as L0, L1, and L2, respectively. During the tensioning process of the carbon fiber mesh, the distances at three different times during the tensioning process are continuously measured as L... 00 L 11 L 22 The warping of the bottom concrete part is calculated by the following formula (1), so the warping value of the bottom concrete part at different times can be obtained.

[0066] After the upper layer of concrete was poured and reached the specified curing time, an infrared laser level was used to mark a horizontal line on the side of the upper concrete slab. The distances from the top of the slab to the two ends and the middle horizontal line were recorded as L3, L4, and L5, respectively. During the process of unloading the carbon fiber mesh, the distances at three different times were continuously measured as L. 33 L 44 L 55 The warpage of the upper concrete slab is calculated using the following formula (2). By recording the changes in the flatness of the entire concrete structure caused by prestress, the warpage value of the top concrete part at different times can be obtained.

[0067] Q = (L 22 -L2+L 00 -L0+L1-L 11 ) / twenty one)

[0068] Q = (L 33 -L3+L 55 -L5+L4-L 44 ) / twenty two)

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A prestressed anchoring device, characterized in that: It includes embedded part, fixed part and tensioning part; The embedded part is embedded in the bottom concrete part, and has positioning rods at both ends extending out of the bottom concrete part; The fixing part is fixedly connected to the positioning rod at one end, and a self-locking anchor is fixedly arranged on the fixing part, and the self-locking anchor comprises a fixing frame and a first cloth-winding shaft and a second cloth-winding shaft arranged in parallel thereon; The tensioning part is fixedly connected to the positioning rod at the other end, on which the self-locking anchor is arranged, and the fixing frame of the self-locking anchor is connected to the tensioning rod of the tensioning part.

2. The prestressed anchoring device according to claim 1, characterized in that: The two ends of the first cloth rolling shaft are fixed or slidably arranged on the fixing frame; The two ends of the second cloth rolling shaft are fixed or slidably arranged on the fixing frame.

3. The prestressed anchoring device according to claim 1, characterized in that: The fixing frame is formed with a through hole for the tensioning rod to pass through, and the through hole and the upper side surface or the lower side surface of the first cloth winding shaft and the second cloth winding shaft are in the same plane.

4. The prestressed anchoring device according to claim 1, characterized in that: The middle parts of the first cloth-winding shaft and the second cloth-winding shaft are flat, and the front and rear ends are arc surfaces.

5. The prestressed anchoring device according to claim 1, characterized in that: The embedded part comprises: Two positioning embedded plates are respectively arranged at the two ends of the bottom concrete part; A plurality of steel bars, both ends of which are fixedly connected to the positioning embedded plate; The lower end of the positioning rod is fixedly connected to the positioning embedded plate, and the upper end of the positioning rod is formed with an external thread.

6. The prestressed anchoring device according to claim 5, characterized in that: The fixing part comprises a first bracket connected to the positioning rod by bolts, and the first bracket is provided with a connecting rod fixedly connected to the self-locking anchor.

7. The prestressed anchoring device according to claim 6, characterized in that: The tensioning part comprises: A second bracket, bolted to the positioning rod, on which the tension rod is passed; A reaction plate, fixedly connected to an end of the tension rod away from the self-locking anchor; A fixing nut, threadedly connected to the tension rod, and located on a side of the second bracket away from the self-locking anchor; The jack has two ends connected to the second bracket and the reaction plate respectively.

8. The prestressed anchoring device according to claim 7, characterized in that: The jack, the tension rod and the connecting rod are in the same plane, and are in the same plane with the upper side surface or the lower side surface of the first cloth winding shaft and the second cloth winding shaft.

9. The prestressed anchoring device according to claim 8, characterized in that: A pressure sensor is also arranged between the jack and the reaction plate.

10. A method for constructing a concrete structure, using the prestressed anchoring device according to any one of claims 1 to 9, characterized in that: The concrete structure comprises a bottom concrete part and a top concrete part, and the construction method comprises: The embedded part is arranged during the construction of the bottom concrete part, and the upper end surface of the bottom concrete part is reserved for connecting the steel bars and the positioning rod; After the bottom concrete portion reaches a preset strength, the fixing portion and the tensioning portion are installed on the positioning rod; After the prestressed fabric is fully impregnated with epoxy resin glue, before the glue solidifies, the two ends are respectively wrapped with the self-locking anchors for self-locking, and the self-locking anchors of the tensioning part are moved to make the prestressed fabric in a horizontal state; After the glue on the prestressed fabric solidifies, the tensioning part is tensioned, and after the prestressed fabric reaches the preset stress, the self-locking anchor of the tensioning part is fixed; The top concrete part is constructed at the prestressed cloth, and after the top concrete part reaches a preset strength, the fixing part and the tensioning part are removed.

Images