Prestressing tensioning device and prestressing tensioning method

Abstract

This application relates to a prestressing tensioning device and method, belonging to the field of prestressing tensioning technology. The prestressing tensioning device includes a support member and a jack. The support member has a through cavity along its own axis for threading steel strands. The jack has a connector and a tensioning member arranged opposite to each other. The connector is detachably connected to the support member. The steel strands are sequentially threaded through the connector and the tensioning member. The tensioning member clamps the end of the steel strand and can controllably extend and retract. This application avoids the problem of difficult prestressing tensioning construction when the steel strand is too long, improving construction efficiency.

Description

Technical Field

[0001] This application relates to the field of prestressing tensioning technology, and in particular to a prestressing tensioning device and a prestressing tensioning method. Background Technology

[0002] Prestressing refers to the stress applied to a structure before it bears service loads. Its core principle is to actively utilize the recoil capacity of high-strength materials (such as steel strands) to pre-apply compressive stress to materials like concrete, which have high compressive strength but low tensile strength. When the structure generates tensile stress under external loads, this pre-applied compressive stress can completely or partially offset the tensile stress, thereby significantly improving the crack resistance, stiffness, and load-bearing capacity of the components.

[0003] In offshore floating wind power and other fields, the number of prestressed steel strands in a single prestressed duct can reach 20-30 or more. After passing through the anchor, the space between the steel strands is very limited, and the single tensioning jack has a certain volume. Furthermore, because the steel strands have limited curvature and require a long reserved length, the prestressing tensioning construction is difficult and the construction efficiency is significantly reduced. Summary of the Invention

[0004] Therefore, it is necessary to provide a prestressing tensioning device and method to address the problem of difficulties in prestressing tensioning construction caused by the large number of steel strands.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a prestressing tensioning device for prestressing multi-strand steel strands, comprising:

[0007] The support member has a through cavity along its own axis, the through cavity being used to pass through the steel strand;

[0008] The jack has a connector and a tensioning member arranged opposite to each other. The connector and the support member are detachably connected. The steel strand is passed through the connector and the tensioning member in sequence. The tensioning member clamps the end of the steel strand and can be controlled to extend and retract.

[0009] In one embodiment of the first aspect, the connector includes a body, a sliding sleeve, and a ball bearing. The body has a receiving cavity along the axial direction and a mounting hole on its periphery. The ball bearing is installed in the mounting hole. The sliding sleeve is slidably sleeved on the outside of the body. The support member has a groove at one end near the jack. After the support member passes through the receiving cavity, the ball bearing can be controlled to embed into the groove.

[0010] In one embodiment of the first aspect, a limiting portion is provided inside the end of the main body away from the support member, and the support member abuts against the limiting portion after passing through the receiving cavity.

[0011] In one embodiment of the first aspect, the connector further includes an elastic element disposed between the sliding sleeve and the body.

[0012] In one embodiment of the first aspect, the prestressed tensioning device further includes an anchor, the anchor having a plurality of channels through which a steel strand is threaded, and the end of the support member away from the jack abuts against the anchor.

[0013] In one embodiment of the first aspect, the support member has a widened portion at one end near the anchor, the widened portion protruding radially along the support member.

[0014] In one embodiment of the first aspect, the support member is provided with multiple members, and each support member is provided with a corresponding steel strand, and the jack is connected to each support member through the connector.

[0015] In one embodiment of the first aspect, the inner diameter Ф1 of the cavity is greater than the outer diameter Ф2 of the steel strand, and satisfies: Ф2+0.1mm≤Ф1≤Ф2+0.5mm.

[0016] Secondly, embodiments of this application also provide a prestressing tensioning method, applied to the prestressing tensioning device described in any embodiment, the prestressing tensioning method comprising:

[0017] The anchorage is fixed to the building structure, and each steel strand is led out from the hole of the anchorage;

[0018] The support is sleeved on the outside of the steel strand and abuts against the anchor.

[0019] The jack engages with the support member and drives the tensioning member to stretch the end of the steel strand.

[0020] In one embodiment of the second aspect, the prestressing tensioning method further includes:

[0021] The multiple support members are respectively connected to a corresponding strand of steel wire, and the jack is simultaneously engaged with each of the support members to tension all the steel wires at once.

[0022] Compared to related technologies, the beneficial effects of this application are as follows: This application provides a prestressed tensioning device and a prestressed tensioning method. The prestressed tensioning device includes a support member and a jack. Steel strands are threaded through the support member, which has a certain length, allowing the jack to be connected to the end of the support member furthest from the building structure. In this case, the jack is located at the tail end of the steel strand, facilitating its installation and avoiding the problem of difficulty in prestressed tensioning construction caused by the need to install the jack between multiple strands when the steel strand is too long, thus improving construction efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a prestressed tensioning structure in related technologies;

[0025] Figure 2 This is a schematic diagram of the prestressed tensioning device in some embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the jack structure in some embodiments of this application;

[0027] Figure 4 The following are schematic diagrams of the structure of the support member in some embodiments of this application;

[0028] Figure 5 This is a schematic diagram of the connection structure between the support member and the jack in some embodiments of this application. Figure 1 ;

[0029] Figure 6 This is a schematic diagram of the connection structure between the support member and the jack in some embodiments of this application. Figure 2 ;

[0030] Figure 7 This is a schematic diagram of the anchorage structure in some embodiments of this application;

[0031] Figure 8 for Figure 4 The diagram shows an enlarged view of part A.

[0032] Figure 9 This is a flowchart illustrating the prestressing tensioning method in some embodiments of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 110a, jack; 200, steel strand;

[0035] 100. Prestressed tensioning device; 110. Jack; 111. Connector; 1111. Main body; 1112. Sliding sleeve; 1113. Ball bearing; 1114. Elastic element; 1115. Limiting part; 1116. Fitting part; 112. Tensioning element; 120. Supporting element; 121. Through cavity; 122. Groove; 130. Anchor; 131. Channel. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms 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 this application 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 this application.

[0038] Furthermore, where the term "and / or" appears, "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. Where the terms "first" and "second" appear, these terms are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0042] See Figure 1 As shown, in related technologies, such as offshore floating wind power, the number of prestressed steel strands in a single prestressed duct can reach 20-30 or more. After passing through the anchor, the space between the steel strands is very limited. Therefore, when prestressing a single steel strand, it is necessary to pass it through a jack. However, the jack has a certain volume, and because the steel strand has limited curvature and requires a relatively long allowance (generally 1-1.5m), the installation space for the jack is limited, making it difficult to install properly. This leads to difficulties in prestressing construction and a significant reduction in construction efficiency.

[0043] See Figure 2As shown, to improve the above-mentioned problems, an embodiment of this application provides a prestressing tensioning device 100 for prestressing multi-strand steel strands. The prestressing tensioning device 100 includes a support member 120 and a jack 110. The jack 110 is connected to one end of a support rod. The steel strands pass through the support member 120 and the jack 110 in sequence, so that the prestressing of the steel strands is performed by the jack 110. Due to the setting of the support rod, the force-bearing point of the jack 110 is moved backward, which facilitates the placement of the jack 110.

[0044] like Figure 3 and Figure 4 As shown, the support member 120 has a through cavity 121 along its own axis, which is used to pass through the steel strand. The jack 110 has a connector 111 and a tensioning member 112 arranged opposite to each other. The connector 111 is detachably connected to the support member 120. The steel strand passes through the connector 111 and the tensioning member 112 in sequence. The tensioning member 112 clamps the end of the steel strand and can be controlled to extend and retract.

[0045] For example, the support member 120 is a hollow tubular structure with an internal cavity 121 to accommodate the insertion of multiple steel strands, which can be inserted side-by-side within the cavity 121. Thus, during prestressing tensioning of the steel strands, after the steel strands pass through the support member 120, the support member 120 is pressed against the exposed portion of the steel strands within the building structure. Then, a jack 110 is installed at the end of the support member 120 furthest from the building structure, shifting the load-bearing point of the jack 110 from the exposed portion of the building structure to the connection point between the support member 120 and the jack 110. It is understandable that with multiple steel strands, the opening space of the steel strands is larger when the opening angle is the same. Therefore, by using the support member 120, this application effectively moves the connection process, which requires ample operating space, to a more spacious rear area, thus alleviating the difficulty of tensioning construction and improving construction efficiency.

[0046] For example, the building structure in this application embodiment can be an offshore floating wind power station. The connector 111 and the tensioning member 112 are disposed opposite to each other at both ends of the jack 110. The connector 111 is used to connect and fix with the support member 120. The steel strand passes through the support member 120, the connector 111 and the tensioning member 112 in sequence. The tensioning member 112 has a clamping device to fix the steel strand.

[0047] Understandably, the jack 110 connects to the hydraulic system to extend and retract the cylinder. The tensioning member 112 is fixed to the cylinder, thus clamping the steel strand for tensioning during the extension of the cylinder, completing the prestressing tensioning operation.

[0048] Continue reading Figure 5 and Figure 6As shown, in some embodiments, the connector 111 includes a main body 1111, a sliding sleeve 1112, and a ball bearing 1113. The main body 1111 has a receiving cavity along the axial direction, and a mounting hole is provided on the periphery of the main body 1111. The ball bearing 1113 is installed in the mounting hole, and the sliding sleeve 1112 is slidably sleeved on the outside of the main body 1111. The support member 120 has a groove 122 at one end near the jack 110. After the support member 120 passes through the receiving cavity, the ball bearing 1113 can be controlled to be embedded in the groove 122.

[0049] For example, the main body 1111 has a cylindrical structure and a receiving cavity is formed along its axial direction. The inner diameter of the receiving cavity is adapted to the outer diameter of the support member 120 so that the support member 120 can be inserted into the receiving cavity. The circumferential side of the main body 1111 is provided with a mounting hole, which penetrates the side wall of the main body 1111 radially and is connected to the receiving cavity.

[0050] Understandably, there can be multiple mounting holes, evenly distributed around the circumference of the body 1111, for example, three, four, or six, to improve connection stability. The diameter of the mounting hole near the receiving cavity is smaller than the diameter of the ball 1113 to prevent the ball 1113 from falling completely into the receiving cavity.

[0051] The ball bearing 1113 is installed in the mounting hole, and a portion of the spherical surface of the ball bearing 1113 protrudes from the end of the mounting hole near the receiving cavity. The sliding sleeve 1112 has a cylindrical structure and is slidably sleeved on the outside of the main body 1111. The inner wall of the sliding sleeve 1112 is slidably engaged with the outer wall of the main body 1111. The inner wall of the sliding sleeve 1112 is provided with a mating part 1116, which protrudes towards the side near the main body 1111, so that when the mating part 1116 moves above the ball bearing 1113, it presses the ball bearing 1113 into the mounting hole.

[0052] The support member 120 has a groove 122 at one end near the jack 110, and the groove 122 is opened along the circumference of the support member 120. Understandably, the cross-sectional shape of the groove 122 can be arc-shaped, V-shaped or rectangular, to adapt to the spherical surface of the ball 1113.

[0053] During assembly, the support member 120 is inserted into the receiving cavity. When the groove 122 on the support member 120 moves to the position corresponding to the mounting hole, the sliding sleeve 1112 slides, causing the mating part 1116 to move to the position corresponding to the mounting hole. At this time, the mating part 1116 pushes the ball 1113, causing the ball 1113 to embed into the groove 122, thereby achieving a quick locking connection between the connector 111 and the support member 120.

[0054] When disassembly is required, the sliding sleeve 1112 is slid in the reverse direction, causing the mating part 1116 to move away from the mounting hole. At this time, there is a gap between the sliding sleeve 1112 and the main body 1111, providing clearance for the ball 1113. The ball 1113 can move outward under the pressure of the support member 120 and disengage from the groove 122, thereby releasing the locking state and realizing the rapid separation of the connector 111 and the support member 120.

[0055] In some embodiments, a limiting portion 1115 is provided inside the end of the main body 1111 away from the support member 120, and the support member 120 abuts against the limiting portion 1115 after passing through the receiving cavity.

[0056] For example, the limiting part 1115 protrudes from the inner wall of the receiving cavity. When the support member 120 passes through the receiving cavity, the end of the support member 120 near the jack 110 can abut against the limiting part 1115 to limit the axial position of the support member 120 relative to the main body 1111, ensuring that the groove 122 is accurately aligned with the mounting hole.

[0057] Understandably, the limiting portion 1115 can be integrally formed with the main body 1111, for example, by machining an annular boss onto the inner wall of the receiving cavity. The surface of the limiting portion 1115 facing the support member 120 can be configured as a flat abutment surface, perpendicular to the axial direction of the main body 1111, to provide stable axial support. In other embodiments, the abutment surface can also be configured as a conical or spherical surface to adapt to the corresponding shape of the end of the support member 120, achieving a self-centering effect.

[0058] Furthermore, a buffer layer may be provided on the side of the limiting part 1115 facing the support member 120. The buffer layer may be made of elastic materials such as rubber, polyurethane, or nylon. When the support member 120 abuts against the limiting part 1115, the buffer layer can absorb impact loads, prevent damage caused by rigid contact, and at the same time provide a certain preload to eliminate axial clearance.

[0059] In some embodiments, the limiting portion 1115 may be a plurality of protrusions spaced apart circumferentially along the receiving cavity, such as three or four protrusions, with one end of each protrusion facing the center of the receiving cavity located in the same plane perpendicular to the axis, together forming a limiting support for the end of the support member 120. This segmented structure can reduce weight and facilitate processing and assembly.

[0060] Understandably, when the support member 120 abuts against the limiting part 1115, the end face of the support member 120 and the limiting part 1115 may be in surface contact or line contact. To ensure the reliability of the abutment, the end of the support member 120 near the jack 110 may be provided with an abutment plane or abutment groove that is compatible with the limiting part 1115.

[0061] Furthermore, the limiting part 1115 can also have a sealing function. A sealing ring can be embedded in its outer periphery. When the support member 120 is inserted, the sealing ring can seal the gap between the outer wall of the support member 120 and the inner wall of the receiving cavity, preventing dust, moisture and other impurities from entering the receiving cavity and protecting the mating surfaces of the ball 1113 and the groove 122.

[0062] In some embodiments, the connector 111 further includes an elastic element 1114, which is disposed between the sliding sleeve 1112 and the body 1111.

[0063] Understandably, the elastic element 1114 is a compression spring, sleeved on the outer side of the main body 1111, with one end abutting against a boss on the outer wall of the main body 1111 and the other end abutting against the inner wall of the sliding sleeve 1112. Under the elastic force of the elastic element 1114, the sliding sleeve 1112 is held in a position where the mating part 1116 is opposite to the mounting hole, ensuring that the ball 1113 always tends to be embedded in the groove 122, preventing accidental loosening.

[0064] Furthermore, the outer wall of the sliding sleeve 1112 may also be provided with anti-slip texture or operating handle to facilitate the operator's grip and sliding operation.

[0065] In some embodiments, the inner wall of the mounting hole may also be fitted with an elastic sealing ring, which is interference-fitted with the ball 1113. This not only prevents the ball 1113 from falling out of the mounting hole, but also allows the ball 1113 to be smoothly embedded into the groove 122 under the pushing of the sliding sleeve 1112.

[0066] Continue reading Figure 7 As shown, in some embodiments, the prestressed tensioning device 100 further includes an anchor 130, which has a plurality of channels 131, each channel 131 having a corresponding steel strand threaded through it, and the end of the support member 120 away from the jack 110 abuts against the anchor 130.

[0067] For example, the anchor 130 is pre-embedded or installed on the building structure to ultimately anchor the tensioned steel strands. The anchor 130 has multiple holes 131, each corresponding to a single strand of steel strand. During construction, the end of the support member 120 furthest from the jack 110 abuts against the anchor 130. By setting the anchor 130 and having it abut against the support member 120, a complete "anchoring-reaction-tensioning" force transmission path is formed. Specifically, the tension force generated by the jack 110 is transmitted through the support member 120 to the anchor 130, which is then fixed to the building structure, and the anchor 130 further distributes this force throughout the building structure. Meanwhile, the multiple holes 131 on the anchor 130 provide independent paths for the multiple steel strands, ensuring that each steel strand can pass through the support 120 independently and orderly and be clamped by the tensioning element 112 of the jack 110, laying the foundation for the synchronous or step-by-step tensioning of multiple steel strands. This structural design cleverly utilizes the existing anchor 130 on the building structure as a stress point, eliminating the need for additional complex reaction frames for the tensioning device, simplifying the equipment structure and reducing construction costs.

[0068] For example, the anchor 130 can be a disc-shaped, square, or other irregularly shaped plate. Correspondingly, the end of the support member 120 can be provided with a matching square or irregularly shaped flange as an abutment surface. This shape fit can play a role in circumferential positioning, preventing the support member 120 from rotating during tensioning, and is especially suitable for occasions where it is necessary to control the torsional deformation of the steel strand.

[0069] Preferably, the anchorage 130 may have clamping units, such as clamping plates, inside its multiple channels 131 for anchoring the steel strands after tensioning. During prestressing tensioning, the steel strands first pass through the channels 131 and clamping units of the anchorage 130, then through the support member 120, and are finally clamped by the tensioning member 112 of the jack 110. After tensioning is complete, the clamping units automatically engage the steel strands, completing the anchoring. At this point, the jack 110 and support member 120 can be disassembled to tension the next bundle of steel strands.

[0070] Continue reading Figure 8 As shown, in some embodiments, the support member 120 has a widened portion at one end near the anchor 130, and the widened portion protrudes radially along the support member 120.

[0071] For example, by providing a widened section, the contact area between the support member 120 and the anchor 130 or the surface of the building can be effectively increased. During prestressing tensioning, the enormous tensile force generated by the jack 110 is transmitted to the anchor 130 and the building through the support member 120. If the contact area is too small, it may lead to excessively high local compressive stress, causing damage to the bearing surface of the anchor 130 or the building, or even causing safety hazards. The widened section is designed like a "foot," dispersing and transmitting the concentrated force, thereby protecting the structural integrity of the anchor 130 and the building, and ensuring the safety and reliability of the tensioning operation.

[0072] Understandably, the widened portion can be implemented in various structural forms. For example, the widened portion can be an annular pad sleeved and fixed to the end of the support member 120. This annular pad and the support member 120 can be fixed by welding, threaded connection, or integral molding. The annular pad has a simple structure, is easy to process, and can evenly distribute the axial pressure from the support member 120.

[0073] Furthermore, to accommodate different anchor sizes 130 or different construction conditions, the widening portion can also be an independent component detachably connected to the support 120. For example, the end of the support 120 is provided with external threads, while the widening portion is a ring nut with internal threads.

[0074] Alternatively, as another feasible approach, the widened portion can be an enlarged diameter structure formed by upsetting or forging the end of the support member 120 and integrated with the body of the support member 120. This integrated structure avoids the reliability issues of secondary connections, has higher structural strength and stability, and is particularly suitable for ultra-large and ultra-high pressure prestressing tensioning scenarios.

[0075] In some embodiments, the support member 120 is provided with multiple supports, and each support member 120 is provided with a corresponding steel strand. The jack 110 is connected to each support member 120 through the connector 111.

[0076] For example, in applications where multiple steel strands need to be tensioned independently or subjected to uniform force, the support member 120 is provided with multiple strands. Each support member 120 is provided with a corresponding steel strand, and the jack 110 is connected to each support member 120 through its connector 111.

[0077] By setting up multiple independent support members 120, independent support and force transmission for each strand of steel wire are achieved. This structural design of "one support member 120 for each strand of steel wire" has outstanding technical advantages. First, it ensures that the tensioning path of each strand of steel wire is completely independent and does not interfere with each other, avoiding the situation where uneven force on a single strand of steel wire affects each other through the integral support member 120, thereby significantly improving the synchronization accuracy and force uniformity of the tensioning of multiple strands of steel wire.

[0078] In some embodiments, the inner diameter Ф1 of the cavity 121 is greater than the outer diameter Ф2 of the steel strand, and satisfies: Ф2+0.1mm≤Ф1≤Ф2+0.5mm.

[0079] For example, by controlling the gap between the inner diameter Ф1 of the cavity 121 and the outer diameter Ф2 of the steel strand to between 0.1mm and 0.5mm, multiple technical benefits are achieved. First, if the gap is too small, jamming can easily occur when threading the steel strand, especially in actual working conditions where the steel strand itself may have slight bending, twisting, or surface debris, leading to difficulties in threading and seriously affecting construction efficiency. Second, if the gap is too large, the radial movement space of the steel strand within the cavity 121 will be too large. During prestressing tensioning, especially at the initial loading of the jack 110 or the moment when the steel strand is subjected to force and swings, an excessively large gap will cause the steel strand to deviate significantly from or sway within the cavity 121, causing the tension force direction to deviate from the axis of the cavity 121, generating a harmful lateral component force. This will not only exacerbate the friction and wear between the steel strand and the end of the support member 120, but may also affect the precise control of the tension force and the final anchoring quality. Therefore, controlling the gap to 0.1 mm to 0.5 mm not only provides the necessary tolerance space for the smooth installation of the steel strand, but also effectively constrains its radial displacement during the tensioning process, ensuring the accuracy of the force direction and the stability of the process.

[0080] Continue reading Figure 9 As shown, this application embodiment also provides a prestressing tensioning method, applied to the prestressing tensioning device 100 in any embodiment. The prestressing tensioning method includes:

[0081] S10, the anchor 130 is fixed to the building body, and each steel strand is led out from the hole 131 of the anchor 130.

[0082] Specifically, the anchor 130 is fixed at a predetermined position on the building structure where prestressing construction is required. The anchor 130 has multiple channels 131 through which each strand of steel wire is led out and extends to the length to be tensioned. At this time, the ends of the steel wires are in a free state, ready to be connected to the subsequent tensioning equipment.

[0083] Understandably, the fixing method of anchor 130 depends on the specific type of project. For example, for concrete structures, anchor 130 is typically embedded in the formwork before concrete pouring, connected and fixed to the reinforcing steel frame. Once the concrete reaches its design strength, it becomes part of the building structure. Its duct 131 communicates with the pre-reserved corrugated pipe duct 131, and the steel strand can be inserted before or after concrete pouring. For steel structures, anchor 130 can be fixed to the tensioning end support of the steel structure by welding or high-strength bolts.

[0084] S20, the support member 120 is sleeved on the outside of the steel strand and abuts against the anchor 130.

[0085] Specifically, after the steel strand has been led out from the anchor 130, a support member 120 is used. The support member 120 is fitted onto the outside of the steel strand and moved along the steel strand toward the anchor 130 until one end of the support member 120 is pressed against the anchor 130. At this time, the cavity 121 of the support member 120 accommodates the steel strand to pass through, and the support member 120 itself serves as a force transmission medium connecting the building structure and the subsequent jack 110.

[0086] Furthermore, if multiple support members 120 are provided, each support member 120 needs to be fitted onto the corresponding single-strand steel wire leading from each hole 131 of the anchor 130, and the end of each support member 120 needs to be pressed against the peripheral area of ​​the corresponding hole 131 on the anchor 130. If the end of the support member 120 near the anchor 130 is provided with a widened portion, then in this step, the widened portion directly contacts the surface of the anchor 130 to achieve more stable contact and stress dispersion.

[0087] S30, the jack 110 is engaged with the support 120 and drives the tensioning member 112 to stretch the end of the steel strand.

[0088] Specifically, after the support member 120 is installed in place, the jack 110 is moved to the working position. The connector 111 of the jack 110 is then connected and fixed to the end of the support member 120 furthest from the anchor 130. Simultaneously, the position of the jack 110 is adjusted so that the end of the steel strand exiting the cavity 121 of the support member 120 can pass sequentially through the connector 111 of the jack 110, ultimately extending into and reaching the clamping position of the tensioning member 112. Then, the tensioning member 112 is driven, causing its internal clamping device to activate and securely clamp the end of the steel strand.

[0089] After completing the above connections and clamping, the hydraulic system connected to jack 110 (not shown in the figure) can be started. The cylinder of jack 110 is extended, causing the tensioning member 112 fixed to the cylinder and the end of the steel strand it clamps to move together, thereby applying the set prestress to the steel strand. During tensioning, the tension force and the elongation of the steel strand must be monitored in real time until the designed tension control stress is reached.

[0090] After the steel strand is tensioned to the predetermined position, pressure is maintained, and the clamping unit on the anchor 130 is operated to lock the steel strand, completing the permanent anchoring of the prestress onto the building structure. Then, the hydraulic cylinder of the jack 110 is controlled to depressurize and retract, while the clamping device of the tensioning member 112 is released, separating the jack 110 from the end of the steel strand. Finally, the connection between the jack 110 and the support member 120 is disassembled in sequence, and the support member 120 is removed from the steel strand. Thus, the prestressing tensioning operation of the steel strand is completed.

[0091] Furthermore, for tensioning multiple steel strands, this method can employ a simultaneous tensioning approach. During simultaneous tensioning of multiple strands, all support members 120 need to be installed in step S20. In step S30, the jack 110 is simultaneously connected to all support members 120 via its connector 111, and the tensioning components 112 of the jack 110 simultaneously clamp the ends of all steel strands, then tension them into place in one go. This method is more efficient and ensures uniform stress distribution across the multiple steel strands.

[0092] Through the detailed breakdown of the prestressed tensioning method and the description of various implementation methods above, it can be seen that this method closely relies on the unique structure of the aforementioned device, transforming the structural advantages of the device into operational convenience and reliability. The entire method flow is clear, and the steps are closely connected. It is applicable to single-strand tensioning and can also be easily extended to multi-strand simultaneous tensioning, exhibiting strong practicality and adaptability. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A prestressing tensioning device for prestressing multi-strand steel strands, characterized in that, include: The support member has a through cavity along its own axis, the through cavity being used to pass through the steel strand; The jack has a connector and a tensioning member arranged opposite to each other. The connector and the support member are detachably connected. The steel strand is passed through the connector and the tensioning member in sequence. The tensioning member clamps the end of the steel strand and can be controlled to extend and retract.

2. The prestressed tensioning device according to claim 1, characterized in that, The connector includes a main body, a sliding sleeve, and a ball bearing. The main body has a receiving cavity along the axial direction and a mounting hole on its periphery. The ball bearing is installed in the mounting hole. The sliding sleeve is slidably sleeved on the outside of the main body. The support member has a groove at one end near the jack. After the support member passes through the receiving cavity, the ball bearing can be controlled to embed into the groove.

3. The prestressed tensioning device according to claim 2, characterized in that, The main body has a limiting part inside at the end away from the support member, and the support member abuts against the limiting part after passing through the receiving cavity.

4. The prestressed tensioning device according to claim 2, characterized in that, The connector also includes an elastic element, which is disposed between the sliding sleeve and the main body.

5. The prestressed tensioning device according to claim 1, characterized in that, The prestressed tensioning device also includes an anchor, which has multiple channels, and each channel is connected to a steel strand. The end of the support member away from the jack abuts against the anchor.

6. The prestressed tensioning device according to claim 1, characterized in that, The support member has a widened portion at one end near the anchor, and the widened portion protrudes radially along the support member.

7. The prestressed tensioning device according to claim 1, characterized in that, The support member has multiple supports, and each support member has a corresponding steel strand threaded through it. The jack is connected to each support member through the connector.

8. The prestressed tensioning device according to claim 1, characterized in that, The inner diameter Ф1 of the cavity is greater than the outer diameter Ф2 of the steel strand, and satisfies: Ф2+0.1mm≤Ф1≤Ф2+0.5mm.

9. A prestressing tensioning method, characterized in that, The prestressing tensioning device applied to any one of claims 1 to 8, wherein the prestressing tensioning method comprises: The anchorage is fixed to the building structure, and each steel strand is led out from the hole of the anchorage; The support is sleeved on the outside of the steel strand and abuts against the anchor. The jack engages with the support member and drives the tensioning member to stretch the end of the steel strand.

10. The prestressing tensioning method according to claim 9, characterized in that, The prestressing tensioning method further includes: The multiple support members are respectively connected to a corresponding strand of steel wire, and the jack is simultaneously engaged with each of the support members to tension all the steel wires at once.

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