CN103343593A - Prestressed tendon anchorage device capable of being freely regulated and controlled at high precision - Google Patents
Prestressed tendon anchorage device capable of being freely regulated and controlled at high precision Download PDFInfo
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- 238000004873 anchoring Methods 0.000 abstract description 5
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Abstract
本发明公开了一种高精度自由调控的预应力筋锚具，该锚具集预应力筋张拉、高精度调节、放张等功能于一体，最适用于单根中、短束钢绞线张拉锚固、预应力的精确调控以及钢绞线的放张。本发明由基座、推力球轴承、带大伞齿轮的空心螺柱、小伞齿轮、螺帽式锚杯和夹片组成。无需千斤顶即可实现对钢绞线有效工作应力的精确调节和控制。该装置避免了预应力筋应力调整过程中千斤顶的使用，不仅节约了张拉成本，而且操作简单、安全性强、锚固精度高，在预预应力筋张拉及应力大小的调控方面有广泛的应用价值。
The present invention discloses a high-precision freely adjustable prestressed tendon anchor, which integrates the functions of prestressed tendon tensioning, high-precision adjustment, and tensioning release, and is most suitable for tensioning and anchoring of single medium and short strands of steel strands, precise regulation of prestress, and tensioning release of steel strands. The present invention consists of a base, a thrust ball bearing, a hollow stud with a large bevel gear, a small bevel gear, a nut-type anchor cup, and a clip. Accurate regulation and control of the effective working stress of the steel strand can be achieved without a jack. The device avoids the use of a jack in the process of adjusting the stress of the prestressed tendon, which not only saves the tensioning cost, but also is simple to operate, highly safe, and has high anchoring accuracy. It has a wide range of application value in the tensioning of prestressed tendons and the regulation of stress size.
Description
技术领域technical field
本发明涉及一种高精度自由调控的预应力筋锚具The invention relates to a high-precision free-adjustable prestressed tendon anchor
背景技术Background technique
在后张预应力筋构件的施工中，不可避免的涉及到短预应力筋的张拉和放张，传统的张拉工艺下，由于锚具压缩回弹引起的预应力损失相当严重，造成误差，影响到试验结论的获取。近年来出现了一些减少这种预应力损失的锚具，比如，在传统锚杯外加设支撑螺母，通过二次补张拉重新拉出预应力筋第一次锚固过程中回缩的位移，然后旋进支撑螺母至顶板以保持补张拉后的应力水平；也有装置设计直接在回缩位移中插入带缺口垫片，以防止预应力筋回缩。然而，现有的二次张拉锚具都有其缺点，其二次张拉过程必须借助液压千斤顶进行加载，不仅其应力难以高精度控制，而且工序复杂；此外，必须在一定的超张拉状况下才能放张，危险性极高。In the construction of post-tensioned prestressed tendons, it inevitably involves the tensioning and releasing of short prestressed tendons. Under the traditional tensioning process, the prestress loss caused by the compression and springback of the anchorage is quite serious, resulting in errors , affecting the acquisition of experimental conclusions. In recent years, some anchors have appeared to reduce this prestress loss. For example, a support nut is added outside the traditional anchor cup, and the retraction displacement of the prestressed tendon during the first anchoring process is re-drawn through secondary tensioning, and then Screw in the support nut to the top plate to maintain the stress level after the supplementary tension; there are also devices designed to insert notched gaskets directly in the retraction displacement to prevent the retraction of the prestressed tendons. However, the existing secondary tensioning anchors have their disadvantages. The secondary tensioning process must be loaded with the help of hydraulic jacks. Not only the stress is difficult to control with high precision, but also the process is complicated; It can only be released under certain conditions, which is extremely dangerous.
发明内容Contents of the invention
为了解决上述技术问题，本发明专利的技术方案是，一种高精度自由调控的预应力筋锚具，包括中空的基座、推力球轴承、底部设有大伞齿轮的空心螺柱、小伞齿轮、螺帽式锚杯和夹片，所述的基座支撑于混凝土构件表面，基座底板中央开孔以供预应力筋穿过，基座顶板中央开孔以供螺帽式锚杯穿过，基座的侧壁上开孔以供小伞齿轮的转轴穿过，所述的空心螺柱底部的大伞齿轮的底部通过推力球轴承与基座连接，所述的小伞齿轮设置在基座的侧壁上且小伞齿轮的转轴通过基座侧壁上的开孔伸出至基座外，小伞齿轮与大伞齿轮啮合以带动大伞齿轮转动，所述的螺帽式锚杯内部下缘内壁上设置有内螺纹，内部上缘开有锥形空腔，螺帽式锚杯通过内螺纹与带大伞齿轮的空心螺柱连接，所述的夹片设置于锚杯锥形空腔内用以将钢绞线锚固于螺帽式锚杯。In order to solve the above technical problems, the technical solution of the patent of the present invention is a high-precision free-adjustable prestressed tendon anchor, including a hollow base, a thrust ball bearing, a hollow stud with a large bevel gear at the bottom, a small umbrella Gears, nut-type anchor cups and clips. The base is supported on the surface of the concrete member. Through the hole on the side wall of the base for the rotating shaft of the small bevel gear to pass through, the bottom of the large bevel gear at the bottom of the hollow stud is connected with the base through a thrust ball bearing, and the small bevel gear is arranged on On the side wall of the base and the rotating shaft of the small bevel gear protrudes out of the base through the opening on the side wall of the base, the small bevel gear meshes with the large bevel gear to drive the large bevel gear to rotate, the nut type anchor There is an internal thread on the inner wall of the lower edge of the cup, and a tapered cavity is opened on the inner upper edge. The nut type anchor cup is connected with the hollow stud with a large bevel gear through the internal thread, and the clip is set on the anchor cup cone. It is used to anchor the steel strand to the nut-type anchor cup in the hollow-shaped cavity.
所述的一种高精度自由调控的预应力筋锚具，所述的基座为中空的圆柱体腔，顶板开口为正六边形，所述的螺帽式锚杯外部为正六边形且与基座顶板开口相匹配以穿过基座顶板。The high-precision freely adjustable prestressed tendon anchor, the base is a hollow cylindrical cavity, the opening of the top plate is a regular hexagon, and the outside of the nut-type anchor cup is a regular hexagon and is in line with the base. The seat roof opening matches to pass through the base roof.
所述的一种高精度自由调控的预应力筋锚具，所述的小伞齿轮的转轴为六边形以便于用扳手拧转。In the above-mentioned high-precision free-adjustable prestressed tendon anchorage, the rotating shaft of the small bevel gear is hexagonal so that it can be twisted with a wrench.
本发明专利的技术效果在于，无需借助千斤顶，直接通过扳手拧转小伞齿轮，即可进行预应力筋张拉、应力调节以及放张。大小伞齿轮的转换设置，便于应力的调节，能达到控制应力误差少于0.5%的效果，大大提高的锚固精度，保证了试验要求。无需超张拉，在原有应力水平下，通过扳手拧转小伞齿轮，即可对以张拉预应力筋进行放张。操作方便、精度高、经济实惠，可广泛应用于实验室单根中、短束预应力筋锚固。The technical effect of the patent of the present invention is that the tensioning, stress adjustment and release of the prestressed tendons can be carried out by directly twisting the small bevel gear with a wrench without the help of a jack. The conversion setting of large and small bevel gears is convenient for stress adjustment, and can achieve the effect of controlling the stress error of less than 0.5%, greatly improving the anchoring accuracy, and ensuring the test requirements. Without over-tensioning, under the original stress level, the prestressed tendons can be stretched by turning the small bevel gear with a wrench. It is easy to operate, high in precision, and economical, and can be widely used in the anchorage of single medium and short bundle prestressed tendons in laboratories.
下面结合附图对本发明专利作进一步说明。Below in conjunction with accompanying drawing, patent of the present invention is described further.
附图说明Description of drawings
图1为本发明专利的结构示意图；Fig. 1 is the structural representation of patent of the present invention;
图2为本发明专利的剖面图；Fig. 2 is the sectional view of patent of the present invention;
其中1为混凝土、2为基座、3为推力球轴承、4为带大伞齿轮的空心螺柱、5为小伞齿轮、6为螺帽式锚杯、7为夹片、8为钢绞线。Among them, 1 is concrete, 2 is base, 3 is thrust ball bearing, 4 is hollow stud with large bevel gear, 5 is small bevel gear, 6 is nut type anchor cup, 7 is clip, 8 is steel strand Wire.
具体实施方式Detailed ways
参见图1、图2，本发明包括基座、推力球轴承、带大伞齿轮的空心螺柱、小伞齿轮、螺帽式锚杯和夹片。基座支撑于混凝土构件表面，基座底板中央设孔供预应力筋穿过，带大伞齿轮的空心螺柱通过推力球轴承与基座连为一体，小伞齿轮设置在基座的侧边，可以带动大伞齿轮的转动，螺帽式锚杯通过内部螺纹与带大伞齿轮的空心螺柱连接，钢绞线通过夹片锚固于锚杯之上。螺帽式锚杯外部为正六边形，其大小能恰好穿过基座顶部预留的六边形开口。小伞齿轮设有较长转轴，转轴伸出基座侧边，伸出部分转轴为六边形，便于用扳手拧转。Referring to Fig. 1 and Fig. 2, the present invention comprises a base, a thrust ball bearing, a hollow stud with a large bevel gear, a small bevel gear, a nut type anchor cup and clips. The base is supported on the surface of the concrete component. A hole is set in the center of the bottom plate of the base for the passage of prestressed tendons. The hollow stud with a large bevel gear is connected with the base through a thrust ball bearing. The small bevel gear is set on the side of the base. , can drive the rotation of the large bevel gear, the nut-type anchor cup is connected with the hollow stud with the large bevel gear through the internal thread, and the steel strand is anchored on the anchor cup through the clip. The outside of the nut-type anchor cup is a regular hexagon, and its size can just pass through the reserved hexagonal opening on the top of the base. The small bevel gear is provided with a longer rotating shaft, and the rotating shaft stretches out from the side of the base, and the extended part of the rotating shaft is hexagonal, which is convenient to twist with a wrench.
基座底板直接支撑于混凝土构件表面，带大伞齿轮螺杆通过推力球轴承与基座连接，钢绞线通过基座底板和螺杆中部均留有空洞锚固于螺帽式锚杯上，用扳手拧转小伞齿轮，通过大伞齿轮带动空心螺杆的转动，由于锚杯式螺帽的转动被基座顶部的六边形开口限制，扳手拧动下小伞齿轮的转动只能导致锚杯缓慢的上移或者下降，从而达到对控制应力的精确调节。无需千斤顶即可进行预应力筋的张拉，预应力筋穿过锚杯后，将夹片用力敲紧，拧转小伞齿轮使锚杯上伸，夹片内楔夹紧实现预应力筋的张拉。放张时只要反向拧转小伞齿轮使螺帽下降即可。The bottom plate of the base is directly supported on the surface of the concrete component. The screw with a large bevel gear is connected to the base through a thrust ball bearing. Turn the small bevel gear to drive the rotation of the hollow screw through the large bevel gear. Since the rotation of the anchor cup nut is restricted by the hexagonal opening on the top of the base, the rotation of the small bevel gear when the wrench is turned can only cause the anchor cup to move slowly. Move up or down to achieve precise adjustment of the control stress. The prestressed tendon can be stretched without a jack. After the prestressed tendon passes through the anchor cup, the clip is firmly tapped, the small bevel gear is turned to make the anchor cup stretch upward, and the inner wedge of the clip is clamped to realize the tension of the prestressed tendon. La Zhang. When unwinding, just turn the small bevel gear in reverse to make the nut drop.
工作过程是：第一步，调节螺帽式锚杯使其靠近基座底板。第二部，穿过钢绞线，并将夹片敲紧。第三部，用扳手拧转小伞齿轮，通过大伞齿轮带动螺帽式锚杯的上移，夹片楔紧实现预应力筋的锚固。第三部，微调小伞齿轮进行控制应力的精确调控。第四部，用扳手拧转小伞齿轮，通过大伞齿轮带动螺帽式锚杯的下移，实现随预应力筋的放张。力的传递路径是：螺帽式锚杯—带大伞齿轮的空心螺杆—推力球轴承—基座底板—混凝土构件。The working process is: the first step, adjust the nut-type anchor cup to make it close to the base plate. The second step is to pass through the steel strand and tap the clip tightly. The third step is to turn the small bevel gear with a wrench, and the nut-type anchor cup is driven up by the large bevel gear, and the clip is wedged tightly to realize the anchoring of the prestressed tendons. The third step is to fine-tune the small bevel gear to control the precise regulation of the stress. The fourth step is to turn the small bevel gear with a wrench, and drive the nut-type anchor cup to move down through the large bevel gear to realize the release of the prestressed tendon. The transmission path of force is: nut-type anchor cup—hollow screw rod with large bevel gear—thrust ball bearing—base plate—concrete member.
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