WO2014146366A1 - 预应力筋用夹片式锚具 - Google Patents

预应力筋用夹片式锚具 Download PDF

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Publication number
WO2014146366A1
WO2014146366A1 PCT/CN2013/077847 CN2013077847W WO2014146366A1 WO 2014146366 A1 WO2014146366 A1 WO 2014146366A1 CN 2013077847 W CN2013077847 W CN 2013077847W WO 2014146366 A1 WO2014146366 A1 WO 2014146366A1
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Prior art keywords
anchor
metal
clip
hole
ring
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PCT/CN2013/077847
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English (en)
French (fr)
Inventor
周建明
陆晓明
徐高巍
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苏州市能工基础工程有限责任公司
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Application filed by 苏州市能工基础工程有限责任公司 filed Critical 苏州市能工基础工程有限责任公司
Priority to CN201390000151.6U priority Critical patent/CN204491599U/zh
Publication of WO2014146366A1 publication Critical patent/WO2014146366A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads

Definitions

  • the invention relates to an anchoring tool which can conveniently realize recovery of various prestressed tendons, and belongs to the technical field of basic engineering structural components.
  • Prestressed tendons such as steel bars, steel strands or steel wires
  • the above-mentioned prestressing tendons as the main stressed members are used to maintain their tensile forces and Pulling forces are transmitted to anchoring devices in concrete or geotechnical.
  • These anchoring devices are collectively referred to as anchors for prestressed tendons.
  • the anchors for prestressed tendons mainly include four types of anchors: grip, support, taper and clip.
  • the clip anchors are often used for tensioning prestressed steel strands.
  • Prestressed tendons are usually used in a single use and are left in the concrete or geotechnical layer after use (the length can reach 20-30 meters). In this way, not only waste of materials, but also obstacles to the construction of adjacent buildings. In a considerable number of engineering examples, adjacent buildings have to take special construction measures in the subsequent construction due to the influence of steel bars, steel strands or steel wires, which greatly increases the difficulty and cost of handling underground obstacles during development.
  • the inner cavity of the anchor head outside the cone is filled with a heat generating agent and an igniter; when the igniter ignites the heat generating agent, the steel strand or the steel wire can be heated to above 1000 degrees Celsius, thereby making the viscous material soft and brittle and The strand or the steel wire is broken when it is pulled, and the steel strand or the steel wire is easily pulled out.
  • a heat generating agent and an igniter when the igniter ignites the heat generating agent, the steel strand or the steel wire can be heated to above 1000 degrees Celsius, thereby making the viscous material soft and brittle and The strand or the steel wire is broken when it is pulled, and the steel strand or the steel wire is easily pulled out.
  • 2008-88772A in which the outer surface of the end of the steel strand used in the device is covered with a viscous synthetic resin sleeve and fixed on the fixing seat, The viscous material fixes the steel strand on the ground, and a high-frequency induction coil is arranged along the length of the steel strand outside the synthetic resin sleeve. When the high-frequency induction coil is energized, an eddy current is generated in the steel strand to heat the viscous material, thereby weakening the viscosity. The adhesion of the material to the strand, which in turn makes it easier to pull out the strand or wire.
  • the technical problem solved by the invention is to propose a clip-type anchoring tool which can really realize the recovery of the prestressed tendons in the actual prestressed concrete structure or geotechnical engineering structure.
  • the technical solution proposed by the present invention is: a clip anchor for prestressing tendons, embedded in concrete or geotechnical for fixing prestressing tendons, the anchoring device comprising a metal anchor ring and embedded a metal clip sleeved in an anchor hole of the metal anchor ring, the metal clip having a substantially circular truncated shape, the middle of the metal clip forming a threaded through hole for inserting the prestressing tendon;
  • the inner wall of the hole is closely attached with a bush made of a fusible material, and the center of the bush is formed with a truncated-shaped through hole matching the outer shape of the metal clip, and the metal clip is inserted into the circle a mesa-shaped through hole in close contact with the bushing, an outer wall of the metal anchor ring is wrapped with an electric heating ring, and the electric heating ring is connected with a wire leading to the outside of the concrete or the rock;
  • One end of the prestressing tendon is clamped by the
  • a modification of the above technical solution is that when one end of the prestressing tendon is inserted into the threaded through hole and clamped by the metal clip, the outer surface of the metal clip and the inner surface of the truncated through hole Form an interference fit.
  • the inner wall of the anchor hole is formed with a ring groove, and the bushing fills the ring groove.
  • the anchor hole is formed inwardly at an inner wall of one end of the small diameter of the truncated-shaped through-hole, and the central through-hole of the boss is smaller than the minimum outer diameter of the metal clip. path.
  • a third preferred variation of the above technical solution is that the metal anchor ring is provided with a protective cover at one end of the metal clip entering the anchor hole, and the outer surface of the wire is provided with a retaining wire tube communicating with the protective cover, the wire After being coiled inside the protective cover, it is transported to the outside of the concrete or rock through the retaining pipe.
  • the anchor hole is formed on the inner wall of one end of the metal clip that enters the anchor hole, and has a symmetric protrusion and a notch.
  • the upper surface of the boss is a curved surface; and the protrusion is buckled in a wedge shape whose thickness gradually increases from the outside to the inside.
  • the fusible material of the bushing is epoxy resin, plastic, wax or nylon, and the outer end surface of the prestressing tending end of the metal anchor ring is provided with a pressing plate; the anchor hole is a single Or more than two.
  • the bushing presses the metal clip
  • the sheet is clamped to the prestressing tendon; especially when the metal clip and the bushing further form an interference fit, the clamping force of the bushing pressing metal clip on the prestressing tendon is larger, fully satisfying the prestressing tendon and the clip
  • the anchoring performance requirements between the sheets; and limited by the size of the metal anchor ring, the bushings are smaller in size and can be better enclosed within the anchor holes of the metal anchor ring, making the bushing easier to achieve an approximation.
  • the full confining pressure state reduces the amount of deformation of the bushing when the prestressing tendon is pulled, thereby increasing the ultimate tensile force of the entire anchor and the prestressing tendon.
  • the electric heating ring Since the electric heating ring is wrapped around the outer wall of the metal anchor ring, when the need for recycling, the electric heating ring can be heated by the electric current of the wire. Because the bushing is small in size, the heat can be quickly and effectively transmitted through the metal anchor ring. The bushing is softened or melted, so that the prestressing tendons are smoothly extracted and recovered from the metal clip.
  • the bushing Since the annular groove is formed in the inner wall of the anchor hole, the bushing is filled with the ring groove, so that the metal clip has sufficient space for separation when the bushing is heated and softened or melted, thereby further ensuring the prestressing tendon from the metal. The recovery is smoothly taken out of the clip.
  • the metal clip 3 can be prevented from withdrawing from the inlet end of the metal anchor ring 1.
  • the clip anchor type anchoring rod for prestressing tendons of the present invention can realize the rapid and convenient recovery of the prestressing tendons in practical engineering while ensuring that the prestressing tendons have great tensile strength.
  • Fig. 1 is a cross-sectional structural view showing a clip type anchor for a prestressed tendon according to a first embodiment.
  • Figure 2 is a plan view of Figure 1.
  • Fig. 3 is a cross-sectional structural view showing the clip anchor of the prestressed tendon of the first embodiment when the prestressing tendon is attached.
  • FIG. 4 is a cross-sectional structural view of the metal anchor ring and metal clip combination exploded in FIG. 1.
  • Figure 5 is a cross-sectional structural view of the metal anchor ring exploded in Figure 1.
  • Fig. 6 is a cross-sectional structural view showing the clip anchor of the prestressed tendon of the first embodiment after being energized and heated.
  • Fig. 7 is a partial cross-sectional structural view showing the practical application of the clip anchor of the prestressed tendon in concrete or geotechnical soil according to the first embodiment.
  • Fig. 8 is a partial cross-sectional structural view showing a clip type anchor for a prestressed tendon of the second embodiment.
  • Fig. 9 is a partial cross-sectional structural view showing a clip type anchor for a prestressed tendon of the third embodiment.
  • Fig. 10 is a cross-sectional structural view showing a clip type anchor for a prestressed tendon of the fourth embodiment.
  • the clip anchor type anchor for the prestressing tendon of the present embodiment is generally embedded in concrete or rock for fixing the prestressing tendon.
  • the anchor includes a metal anchor ring 1 and is nested in
  • the metal clip 3 in the anchor hole 2 of the metal anchor ring 1 has a substantially truncated cone shape.
  • the inner wall of the anchor hole 2 is closely attached with a bushing 4 made of a fusible material, and the center of the bushing 4 is formed with a truncated-shaped through hole 5 matching the outer shape of the metal clip 3, and the metal clip 3 is inserted into the truncated cone shape.
  • the through hole 5 is in close contact with the bushing 4, and a threaded through hole 6 is formed in the middle of the metal clip 3.
  • the outer wall of the metal anchor ring 1 is wrapped with an electric heating ring 7, and the electric heating ring 7 is connected with a wire 8 leading to the outside of concrete or rock.
  • a wire conduit 9 is provided on the outside of the wire 8 for isolating the wire 8 from the rock or concrete.
  • the fusible material of the bushing 4 may be epoxy resin, plastic, wax or nylon.
  • the clip anchor of the prestressing tendon of the present embodiment is inserted into the threaded through hole 6 of the metal clip 3 (not shown) when the prestressing tendon 10 is inserted.
  • the inner portion is clamped by the metal clip 3, and the outer surface of the metal clip 3 at this time forms an interference fit with the inner surface of the truncated-shaped through hole 5 of the bushing 4.
  • the prestressing tendons 10 are provided with the sheath tube 11, and when one end of the prestressing tendon 10 is inserted into the threaded through hole 6, the pressing plate 12 is disposed on the outer end surface of the leading end of the prestressing tendon 10 of the metal anchor ring 1.
  • the prestressing tendon of the present embodiment is tested in the practical application of the clip anchor, and the tensile strength of the prestressing tendon 10 and the metal clip 3 (combined) can reach 26 tons.
  • the inner wall of the anchor hole 2 of the metal anchor ring 1 is formed with a ring groove 13.
  • the bushing 4 is fitted into the anchor hole 2 to fill the ring groove 13.
  • the inner wall of the anchor hole 2 located at one end of the small diameter of the truncated-shaped through hole 5 is formed with the boss 15 inwardly.
  • the center through hole diameter d2 of the boss 15 is smaller than the minimum outer diameter d1 of the metal clip 3. .
  • the position of the metal clip 3 can be better limited when the prestressing tendon 10 is subjected to a tensile force.
  • the ring groove and the boss 15 can also be removed, and the anchor hole 2 is a through hole.
  • Fig. 7 reflects the practical application of the clip anchor of the prestressed tendon of the present embodiment in concrete or geotechnical 100, and the lead 8 exposed outside the concrete or rock is finally connected to the external low voltage safety power source 14.
  • the clip anchor of the prestressing tendon of this embodiment is basically the same as that of the first embodiment, except that, as shown in FIG. 8, the metal anchor ring 1 is provided at one end of the metal clip 3 entering the anchor hole 2.
  • the cover 18, the wire 8 connected to the electric heating ring 7, is coiled inside the protective cover 18 and then conveyed to the outside of concrete or rock through a retaining pipe 9 communicating with the protective cover 18. This prevents the wire 8 from being broken due to the displacement of the anchor.
  • the clip anchor of the prestressing tendon of this embodiment is basically the same as that of the first embodiment, except that, as shown in FIG. 9, the anchor hole 2 is formed on the inner wall of one end of the metal clip 3 entering the anchor hole 2. Symmetrical protrusions are inverted 16 and notched 17. Thus, after the metal clip 3 enters the anchor hole 2 of the metal anchor ring 1, the metal clip 3 can be prevented from being withdrawn from the inlet end of the metal anchor ring 1.
  • the protruding undercut 16 has a wedge shape whose thickness gradually increases from the outside to the inside.
  • the shape of the protruding undercut 16 can be various; and in the present embodiment, the upper surface of the boss 15 is curved from the plane of the second embodiment.
  • a variation conceivable in the present embodiment is that a pair of symmetrical projection inverted buckles 16 are formed at the inlet end of the metal anchor ring 1, i.e., the notch 17 is changed into a wedge-shaped projection inverted.
  • the clip type anchor for the prestressed tendon of the present embodiment is a porous form which evolves on the basis that the anchor hole 2 of the first embodiment is a single hole form, and each of the anchor holes 2 has the same mating structure as the metal clip 3 and the like. As shown in FIG. 10, the only difference is that the metal anchor ring 1 includes a plurality of anchor holes 2, so that a plurality of prestressing tendons can be clamped and fixed.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Insertion Pins And Rivets (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)

Abstract

一种预应力筋用夹片式锚具，属于基础工程结构构件技术领域。该锚具包括金属锚环（1）和嵌套在金属锚环（1）的锚孔（2）内的圆台形金属夹片（3），金属夹片（3）的中间形成螺纹通孔（6）；锚孔（2）内壁紧贴设有可熔衬套（4），衬套（4）的中心形成有与金属夹片（3）相匹配的圆台形通孔（5），金属夹片（3）插入圆台形通孔（5）内与衬套（4）紧贴，金属锚环（1）外壁裹贴有电加热环（7），电加热环（7）上连接有通往混凝土或岩土外面的导线（8）；当预应力筋（10）插入螺纹通孔（6）时被金属夹片（3）夹紧；当导线（8）通电时，电加热环（7）产生热量加热金属锚环（1）使衬套（4）软化或熔化。该锚具通过金属锚环（1）与金属夹片（3）之间设置可熔衬套（4）来压迫金属夹片（3）夹紧预应力筋（10），在保证预应力筋（10）具有很大抗拉强度的同时，实现了快速方便地回收预应力筋（10）。

Description

预应力筋用夹片式锚具
本发明涉及一种可方便实现各种预应力筋回收的锚具，属于基础工程结构构件技术领域。
在现有预应力混凝土结构或岩土工程结构中广泛使用预应力筋（如钢筋、钢绞线或钢丝等），上述作为主要受力构件的预应力筋都要用到可以保持其拉力并将拉力传递到混凝土或岩土中的锚固装置，这种锚固装置统称为预应力筋用锚具。预应力筋用锚具主要有握裹式、支承式、锥塞式和夹片式四类锚具，其中夹片式锚具常用于张拉预应力钢绞线。
预应力筋通常都是一次性使用，且使用完后均遗留在混凝土或岩土层中（其长度可达到20-30米）。这样一来，不仅浪费材料，还对邻近建筑物施工形成障碍。在相当多的工程实例中，邻近建筑物在后续的施工中因为钢筋、钢绞线或钢丝的影响，不得不采取特殊的施工措施，大大增加了开发时处理地下障碍物的难度和费用。
据申请人了解，现有夹片式锚具已有几种方便回收的技术。如：1）日本国专利JP4143312A所公开的一种可拆除锚的方法，在该方法中提到在钢绞线或钢丝外表面粘附粘性材料，圆锥夹住钢绞线或钢丝外表面，在圆锥外面的锚头内腔中填充有发热剂和点火器；当点火器点火引燃发热剂时，即可将钢绞线或钢丝加热到1000摄氏度以上，从而使粘性材料变软而脆并在钢绞线或钢丝受拉时产生断裂，进而容易拉出钢绞线或钢丝。2）日本国专利JP2008-88772A所公开的一种通过高频感应电流加热拆除锚杆的装置，该装置中使用的钢绞线末端外表面覆盖粘性的合成树脂套并固定在固定座上，通过粘性材料将钢绞线固定在地面，在合成树脂套外沿钢绞线长度方向设有高频感应线圈，当高频感应线圈通电后在钢绞线产生涡电流加热粘性材料，从而消弱粘性材料对钢绞线的粘力，进而容易拉出钢绞线或钢丝。
上述公开的可实现预应力筋回收的锚具，由于结构复杂和不易加工和施工，因此只存在理论上的意义，在实际工程中实现的难度较大。
本发明解决的技术问题是：提出一种可在实际预应力混凝土结构或岩土工程结构中，真正方便实现预应力筋回收的夹片式锚具。
为了解决上述技术问题，本发明提出的技术方案是：一种预应力筋用夹片式锚具，埋设于混凝土或岩土中用于固定预应力筋，所述锚具包括金属锚环和嵌套在金属锚环的锚孔内的金属夹片，所述金属夹片的外形基本呈圆台形，所述金属夹片的中间形成用于插入所述预应力筋的螺纹通孔；所述锚孔的内壁紧贴设有由可熔材料制成的衬套，所述衬套的中心形成有与所述金属夹片的外形相匹配的圆台形通孔，所述金属夹片插入所述圆台形通孔内并与所述衬套紧贴，所述金属锚环的外壁裹贴有电加热环，所述电加热环上连接有通往所述混凝土或岩土外面的导线；当所述预应力筋的一端插入所述螺纹通孔时被金属夹片夹紧；当所述导线通电时，所述电加热环产生热量加热金属锚环使所述衬套软化或熔化。
上述技术方案的一个完善是，当所述预应力筋的一端插入到所述螺纹通孔内被金属夹片夹紧时，所述金属夹片的外表面与所述圆台形通孔的内表面形成过盈配合。
作为上述技术方案的第一个优选变化是，所述锚孔的内壁制有环槽，所述衬套填满所述环槽。
作为上述技术方案的第二个优选变化是，所述锚孔位于所述圆台形通孔小径的一端的内壁向内形成凸台，所述凸台的中心通孔孔径小于金属夹片的最小外径。
作为上述技术方案的第三个优选变化是，所述金属锚环位于金属夹片进入锚孔的一端设有保护罩，所述导线的外面设有与保护罩连通的护线管，所述导线在保护罩内盘绕后通过护线管输送到混凝土或岩土外面。
作为上述技术方案的第四个优选变化是，所述锚孔位于金属夹片进入锚孔的一端内壁上制有对称的突起倒扣和缺口。
作为上述技术方案的第五个优选变化是，所述凸台的上表面是曲面；所述突起倒扣呈厚度由外到内逐渐增大的楔形。
作为上述技术方案的进一步完善是，所述衬套的可熔材料是环氧树脂、塑料、蜡或尼龙，所述金属锚环的预应力筋进入端的外端面设置压板；所述锚孔是单个或二个以上。
本发明的上述技术方案运用中与现有技术相比具有下列优点：
1、由于在金属锚环的锚孔内壁紧贴设有由可熔材料制成的衬套，当将预应力筋的一端插入到金属夹片中心的螺纹通孔内时，衬套压迫金属夹片对预应力筋夹紧；尤其是在金属夹片与衬套进一步形成过盈配合时，衬套压迫金属夹片对预应力筋形成的夹紧力就更大，完全满足预应力筋与夹片之间的锚固性能要求；而且受限于金属锚环的大小，衬套尺寸较小，可以在金属锚环的锚孔内更好地被封闭，从而使衬套更容易达到一种近似“全围压”状态，减少衬套在预应力筋受拉时产生的变形量，进而提高整个锚具和预应力筋组合后的极限拉力。
2、由于在金属锚环的外壁裹贴有电加热环，因此当需要回收时，可利用导线通电使电加热环发热，由于衬套尺寸较小，因此经金属锚环传热后可以迅速有效地将衬套软化或熔化，从而实现预应力筋从金属夹片中顺利抽出回收。
3、由于在锚孔的内壁制有环槽，让衬套填满环槽，因此在衬套被加热软化或熔化时使金属夹片有足够的空间进行分离，从而进一步确保预应力筋从金属夹片中顺利抽出回收。
4、由于在环槽一端的金属锚环的内壁向内形成凸台并使凸台的中心通孔孔径小于金属夹片的最小外径，可以在预应力筋受到拉力时更好地限制金属夹片3的位置。
5、由于在金属锚环的进口端内壁上制有对称的突起倒扣和缺口，可以防止金属夹片3从金属锚环1的进口端退出。
总之，基于以上优点，本发明的预应力筋用夹片式锚具在保证预应力筋具有很大抗拉强度的同时，真正实现了在实际工程中快速方便地回收预应力筋。
下面结合附图对本发明的预应力筋用夹片式锚具作进一步说明。
图1是实施例一的预应力筋用夹片式锚具的剖面结构图。
图2是图1的俯视图。
图3是实施例一的预应力筋用夹片式锚具在安装预应力筋时的剖面结构图。
图4是图1中分解的金属锚环和金属夹片组合的剖面结构图。
图5图1中分解的金属锚环的剖面结构图。
图6是实施例一的预应力筋用夹片式锚具在通电加热后的剖面结构图。
图7是实施例一的预应力筋用夹片式锚具在混凝土或岩土中实际应用的局部剖面结构图。
图8是实施例二的预应力筋用夹片式锚具的局部剖面结构图。
图9是实施例三的预应力筋用夹片式锚具的局部剖面结构图。
图10是实施例四的预应力筋用夹片式锚具的剖面结构图。
实施例一
本实施例的预应力筋用夹片式锚具，一般埋设于混凝土或岩土中用于固定预应力筋，如图1、图2所示，该锚具包括金属锚环1和嵌套在金属锚环1的锚孔2内的金属夹片3，金属夹片3的外形基本呈圆台形。锚孔2的内壁紧贴设有由可熔材料制成的衬套4，衬套4的中心形成有与金属夹片3的外形相匹配的圆台形通孔5，金属夹片3插入圆台形通孔5内并与衬套4紧贴，金属夹片3的中间形成有螺纹通孔6。金属锚环1的外壁裹贴有电加热环7，电加热环7上连接有通往混凝土或岩土外面的导线8。导线8的外面设有护线管9，用于将导线8与岩土体或混凝土隔离。衬套4的可熔材料可以采用环氧树脂、塑料、蜡或尼龙。
如图3所示，本实施例的预应力筋用夹片式锚具在实际施工应用时，当预应力筋10的一端插入到金属夹片3的螺纹通孔6（图上未示出）内时被金属夹片3夹紧，此时金属夹片3的外表面与衬套4的圆台形通孔5的内表面形成过盈配合。通常预应力筋10都是带有护套管11的，而且当预应力筋10一端插入到螺纹通孔6后，会在金属锚环1的预应力筋10进入端的外端面设置压板12。本实施例的预应力筋用夹片式锚具实际应用中经测试，预应力筋10以及金属夹片3（组合后的）的抗拉强度可以达到26吨。
如图4和图5所示，金属锚环1的锚孔2的内壁制有环槽13。如图3所示，衬套4安装到锚孔2内后填满环槽13。如图4和图5所示，位于圆台形通孔5小径的一端的锚孔2的内壁向内形成凸台15，凸台15的中心通孔孔径d2小于金属夹片3的最小外径d1。这样，可以在预应力筋10受到拉力时更好地限制金属夹片3的位置。当然，容易想到的是，环槽和凸台15也可以去掉，锚孔2是一个直通孔。
如图6所示，当导线8通电时，电加热环7产生热量加热金属锚环1使衬套4软化或熔化。当拉动预应力筋10时，软化或熔化后的衬套4从金属锚环1的锚孔2挤出或漏出，环槽13内被腾空，此时金属夹片3失去约束并向两侧分离移动到环槽13内，金属夹片3分离后螺纹通孔6变大，预应力筋10即可顺利地被拉出。
图7反映了本实施例的预应力筋用夹片式锚具在混凝土或岩土100中实际应用的情况，露出混凝土或岩土外面的导线8最终接到外部低压安全电源14上。
实施例二
本实施例的预应力筋用夹片式锚具与实施例一基本相同，所不同的是，如图8所示，在金属锚环1位于金属夹片3进入锚孔2的一端设有保护罩18，电加热环7上连接的导线8在保护罩18内盘绕后通过与保护罩18连通的护线管9输送到混凝土或岩土外面。这样防止因为锚具的位移而拉断导线8。
实施例三
本实施例的预应力筋用夹片式锚具与实施例一基本相同，所不同的是，如图9所示，在锚孔2位于金属夹片3进入锚孔2的一端内壁上制有对称的突起倒扣16和缺口17。这样，在金属夹片3进入金属锚环1的锚孔2后，可以防止金属夹片3从金属锚环1的进口端退出。
本实施例中，突起倒扣16呈厚度由外到内逐渐增大的楔形。
当然，突起倒扣16的形状可以多种多样；而且在本实施例中，凸台15的上表面由实施例二的平面变成曲面。
此外，本实施例可以想到的变化是，在金属锚环1的进口端制有一对对称的突起倒扣16，即将缺口17改变成楔形突起倒扣。
实施例四
本实施例的预应力筋用夹片式锚具是在实施例一的锚孔2为单孔形式基础上演变的多孔形式，每个锚孔2与金属夹片3等零件的配合结构相同。如图10所示，所不同的仅是：金属锚环1含有多个锚孔2，从而可以对多根预应力筋进行夹持固定。
本发明的不局限于上述实施例所述的具体技术方案，上述实施例只为说明本发明的基本技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并加以实施，凡采用等同替换形成的技术方案均为本发明要求的保护范围。

Claims (10)

  1. 一种预应力筋用夹片式锚具，埋设于混凝土或岩土中用于固定预应力筋，所述锚具包括金属锚环和嵌套在金属锚环的锚孔内的金属夹片，所述金属夹片的外形基本呈圆台形，所述金属夹片的中间形成用于插入所述预应力筋的螺纹通孔；所述锚孔的内壁紧贴设有由可熔材料制成的衬套，所述衬套的中心形成有与所述金属夹片的外形相匹配的圆台形通孔，所述金属夹片插入所述圆台形通孔内并与所述衬套紧贴，所述金属锚环的外壁裹贴有电加热环，所述电加热环上连接有通往所述混凝土或岩土外面的导线；当所述预应力筋的一端插入所述螺纹通孔时被金属夹片夹紧；当所述导线通电时，所述电加热环产生热量加热金属锚环使所述衬套软化或熔化。
  2. 根据权利要求1所述预应力筋用夹片式锚具，其特征在于：当所述预应力筋的一端插入到所述螺纹通孔内被金属夹片夹紧时，所述金属夹片的外表面与所述圆台形通孔的内表面形成过盈配合。
  3. 根据权利要求1或2所述预应力筋用夹片式锚具，其特征在于：所述锚孔的内壁制有环槽，所述衬套填满所述环槽。
  4. 根据权利要求3所述预应力筋用夹片式锚具，其特征在于：所述金属锚环位于所述圆台形通孔小径的一端的内壁向内形成凸台，所述凸台的中心通孔孔径小于金属夹片的最小外径。
  5. 根据权利要求3所述预应力筋用夹片式锚具，其特征在于：所述金属锚环位于金属夹片进入锚孔的一端设有保护罩，所述导线的外面设有与保护罩连通的护线管，所述导线在保护罩内盘绕后通过护线管输送到混凝土或岩土外面。
  6. 根据权利要求1或2所述预应力筋用夹片式锚具，其特征在于：所述锚孔位于金属夹片进入锚孔的一端内壁上制有对称的突起倒扣和缺口。
  7. 根据权利要求4所述预应力筋用夹片式锚具，其特征在于：所述凸台的上表面是曲面。
  8. 根据权利要求6所述预应力筋用夹片式锚具，其特征在于：所述突起倒扣呈厚度由外到内逐渐增大的楔形。
  9. 根据权利要求1所述预应力筋用夹片式锚具，其特征在于：所述衬套的可熔材料是环氧树脂、塑料、蜡或尼龙，所述金属锚环的预应力筋进入端的外端面设置压板。
  10. 根据权利要求1所述预应力筋用夹片式锚具，其特征在于：所述锚孔是单个或二个以上。
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CN112031842A (zh) * 2020-08-28 2020-12-04 中国科学院武汉岩土力学研究所 一种一体化快速安装与退锚锚具
CN112031843A (zh) * 2020-08-28 2020-12-04 中国科学院武汉岩土力学研究所 一种双筒安装与退锚一体化锚具
CN112378555A (zh) * 2020-11-26 2021-02-19 华侨大学 智能锚具及其测试锚杆轴力的方法
CN113969576A (zh) * 2021-10-21 2022-01-25 中建三局集团有限公司 一种新型无粘结后张拉预应力抗拔桩结构
CN114592513B (zh) * 2022-03-14 2024-01-09 深圳市工勘岩土集团有限公司 便于补偿张拉的抓取式锚具结构
CN114592513A (zh) * 2022-03-14 2022-06-07 深圳市工勘岩土集团有限公司 便于补偿张拉的抓取式锚具结构
CN115897569A (zh) * 2022-11-29 2023-04-04 成都理工大学 一种基于镍钛记忆合金的可回收预应力锚索组件

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