CN220579781U - Improved prestress anchoring assembly - Google Patents

Abstract

The utility model discloses an improved prestress anchoring assembly, which belongs to the technical field of anchoring assemblies for highways and railways, and comprises an anchoring nut, an anchoring base plate and one or more prestress steel bars, wherein the key improvement is that the lower end surface of the anchoring nut is processed into a spherical table shape, is matched with a spherical countersunk through hole arranged on the anchoring base plate, and forms spherical contact excessive fit; the prestress between the fastening nut and the anchoring backing plate is always maintained, and the prestress steel bar is perpendicular to the anchoring backing plate and concentric with the anchoring nut; the uniform stress, verticality and concentricity indexes of the anchoring nut, the anchoring base plate and the prestress steel bar are guaranteed, the engineering quality and precision are improved, and the use safety is greatly improved.

Description

Improved prestress anchoring assembly

Technical Field

The utility model relates to the technical field of accurate positioning construction of a highway and railway heavy-load continuous beam and vertical prestressed reinforcement by means of reserved holes, in particular to an improved prestressed anchoring assembly.

Background

The prestressing technique is applied to reinforced concrete structures, i.e. the reinforcement is stretched by applying a prestressing force in advance before an external load is applied to the concrete element. When the concrete member is overloaded by tensile stress, the prestress generated in the early hardening process of the concrete greatly increases the loading capacity of the member, and when the concrete is under the action of overload tensile stress, the failure time of the concrete member can be prolonged.

The patent application number 202122119477, X discloses a prestress anchoring assembly, which aims to solve the problem that construction errors are easy to occur when an anchoring backing plate in a reinforced cement prefabricated member is installed, so that a prestress steel bar deflects vertically to a section, additional internal stress is directly induced, uneven stress on the section is caused, and stress point concentration and fatigue failure acceleration are affected. The lower section surface of the anchoring nut is processed into a conical surface, and the arrangement of the prestressed concrete structure in the road and railway blueprints is relatively dense, so that the space reserved for the anchor holes for the prestressed tendons is relatively small, and the requirements on the size of unbonded prestressed steel bars and components thereof and the size of the anchor holes are also increased, so that the design of an improved prestressed anchoring component is very necessary.

Disclosure of Invention

The utility model provides an improved design of a prestress anchoring component for solving the technical problems.

The technical scheme of the utility model is as follows: an improved prestress anchoring assembly comprises an anchoring base plate and one or more prestress steel bars fixed on the anchoring base plate by means of anchoring nuts, wherein by means of the cooperation of spherical end faces of the anchoring nuts in the assembly and spherical countersunk head guide through holes arranged in the anchoring base plate, self-adaptive adjustment is completed in the prestress application process, uniform stress, verticality and concentricity indexes of the anchoring nuts, the anchoring base plate and the prestress steel bars are guaranteed, spherical contact can be guaranteed no matter what angle the steel bars form with the anchoring base plate, and engineering quality and precision in the prestress application process are facilitated.

Furthermore, the upper end face of the anchor nut is provided with a matched anchor baffle, and the prestress steel rod penetrates through the anchor baffle and the anchor backing plate and locks the anchor baffle on the upper end face of the anchor nut by means of the anchor backup nut.

Further, a spiral rib is sleeved on the prestress steel bar, and the prestress steel bar is perpendicular to the anchoring backing plate and concentric with the anchoring nut.

Furthermore, the prestress anchoring component is arranged in the anchor cavity, and a punch-formed cavity sleeve is arranged in the anchor cavity.

Further, the anchoring backing plate is welded and fixed on the hole sleeve so as to fix the prestress anchoring component in the concrete structure.

Further, the arc surface part of the ball hole on the anchoring base plate takes off the arc of the semicircular part.

Furthermore, the lower part of the spherical countersunk head guide through hole on the anchoring base plate is a cylindrical hole perpendicular to the anchoring base plate, a chamfer is arranged at the junction of the spherical surface part and the cylindrical surface part, and the chamfer radius is 2-5mm. When the pressure of the component is increased, the edge part is most likely to generate stress concentration to cause tearing, so the chamfer is arranged to reduce the stress concentration and strengthen the strength of the assembly.

Further, a lower locating plate in a U shape is arranged below the anchoring base plate, through holes which are concentric with the spherical countersunk head guide through holes and are matched in number are formed in the lower locating plate, the prestress steel bar penetrates through the matched through holes and the spherical countersunk head guide through holes and is connected with the anchoring nut, and spiral ribs are sleeved on the prestress steel bar in the lower locating plate.

Further, the spiral ribs are welded and fixed below the anchoring backing plate.

Further, the contact surfaces among the prestress steel bar, the anchoring nut and the anchoring backing plate are all metal surfaces, and a layer of friction material is arranged between the anchoring nut and the anchoring backing plate.

The beneficial effects of the utility model are as follows: (1) The prestress anchoring assembly comprises a prestress steel rod, an anchoring nut and an anchoring backing plate. The spherical lower end surface of the anchor nut is matched with a spherical countersunk head guide through hole arranged in the anchor backing plate to form spherical contact, so that the position of the anchor nut can be adaptively adjusted to adapt to the angle change of the prestress steel rod. Meanwhile, the spherical countersunk head guide through holes arranged in the anchoring backing plate can ensure that the prestress steel bar is perpendicular to the anchoring backing plate in the anchoring process and concentric with the anchoring nut, so that uniform stress is ensured. (2) The chamfer is arranged at the lower edge of the counter bore of the anchoring backing plate, so that stress concentration at the junction of the spherical surface and the cylindrical surface can be reduced, and the probability of failure caused by stress concentration is reduced.

The following table is a stress analysis comparison table of the junction of the through holes of the anchoring base plate when the effective contact areas are similar when the lower end surface of the anchoring nut is a spherical surface and a V surface respectively:

the stress analysis is based on a drawing model, and can be known in the summary: the numerical values of the spherical structure anchor backing plate are superior to those of the V-surface structure anchor backing plate in comparison with the stress, displacement and strain, and the spherical structure design has obvious progress effect in comprehensive comparison.

Drawings

Fig. 1 is a schematic structural view of a first embodiment of the improved pre-stressed anchor assembly of the present utility model.

Fig. 2 is a left side view of a first embodiment of the improved pre-stressed anchor assembly of the present utility model.

Fig. 3 is a schematic structural view of a second embodiment of the improved pre-stressed anchor assembly of the present utility model.

Fig. 4 is a graph comparing performance of the anchor nut with spherical and v-faces, respectively, of the lower end face.

In the drawing, 100 parts of an anchoring backing plate, 110 parts of a spherical countersunk head guide through hole, 120 parts of an anchoring nut, 200 parts of an anchoring baffle, 210 parts of an anchoring backup nut, 300 parts of a prestress steel rod, 310 parts of a spiral rib, 400 parts of an anchor hole, 410 parts of a hole mouth sleeve, 500 parts of a lower positioning plate, 510 parts of a through hole.

Detailed Description

Referring to fig. 1-3, the present utility model provides a prestressed anchorage assembly, comprising an anchorage backing plate 100 and one or more prestressed steel rods 300 disposed on the anchorage backing plate 100 by means of anchorage nuts 120, the key being that: the bottom of the anchor nut 120 is spherical, a spherical countersunk head guide through hole 110 matched with the bottom of the anchor nut 120 is arranged on the anchor backing plate 100, and the spherical countersunk head guide through hole (110) is a cambered surface of a spherical lower semicircle part.

The anchor nut 120 and the anchor pad 100 form a spherical contact so that the anchor nut 120 can adaptively adjust the position to accommodate the angular variation of the pre-stressed steel rod 300. Meanwhile, the spherical countersunk head guide through holes 110 arranged in the anchor backing plate 100 can ensure that the prestress steel bars 300 are perpendicular to the anchor backing plate 100 and concentric with the anchor nuts 120 in the anchoring process, so that uniform stress is ensured.

The anchor pad 100 and other parts requiring perforation include, but are not limited to, three holes, and may be single hole, double hole, or multi-hole depending on the actual needs.

Embodiment one: referring to fig. 1-2, the pre-stressed anchor assembly is disposed within the anchor pocket 400 and cooperates with a stamped pocket sleeve 410. The pocket sleeve 410 may be welded and stretch-formed. The prestress steel rod 300 passes through the anchoring baffle 200 and the anchoring pad 100, the anchoring pad 100 is welded and fixed on the pocket sleeve 410, continuous fracture caused by radial tearing of the edge part of the spherical through hole of the pad is prevented, safety is ensured, and stability and durability of the anchoring pad 100 are enhanced. The lower part of the spherical countersunk head guide through hole 110 on the anchoring base plate 100 is a cylindrical hole perpendicular to the anchoring base plate 100, and a chamfer is arranged at the junction of the spherical surface part and the cylindrical surface part. When the pressure of the component is increased, the edge part is most likely to generate stress concentration to cause tearing, so the chamfer is arranged to reduce the stress concentration and strengthen the strength of the assembly. The spiral ribs 310 are sleeved on the prestress steel bar 300, and the prestress steel bar 300 is perpendicular to the anchoring base plate 100 and concentric with the anchoring nut 120.

The top of the anchor baffle 200 is provided with an anchor backup nut 210, and the anchor backup nut 210 is matched with the prestressed tendons through threads to lock the anchor baffle 200 on the upper end face of the anchor nut 120 for vertical positioning, so that the prestressed tendons are vertical to the anchor baffle 200 and the anchor backing plate 100. The pre-stress steel rod 300 passes through the anchor baffle 200 and the anchor pad 100, and the anchor backup nut 210 locks the anchor baffle 200 to the upper end surface of the anchor nut 120. The anchor baffle 200 adopts an lengthened anchor baffle, and two ends of the anchor baffle 200 are completely contacted with the anchor concave 400 to horizontally position, so that the condition that tensioning and anchoring are difficult due to the fact that the anchor concave 400 is not standardized in construction is prevented.

The installation process of this embodiment is as follows: after the prestress steel bar anchoring assembly is installed, the anchoring baffle is placed on the prestress steel bar, the anchoring backup nut is screwed by workers to lock the anchoring baffle, and then the whole body is poured and vibrated. When the self-adaptive locking device is removed, the anchoring baffle and the anchoring backup nut are removed, the anchoring nut is locked by the tensioning device, the anchoring baffle and the anchoring backup nut are installed, and the locking self-adaptive positioning is realized by limiting and fixing the anchoring hole and the anchoring baffle.

Referring to fig. 2, in this embodiment, a U-shaped lower positioning plate 500 is disposed below the anchor pad 100, through holes 510 concentric with the tapered guiding holes and having a number matching with that of the tapered guiding holes are disposed on the lower positioning plate 500, the prestressed steel rod 300 passes through the matched through holes 510 and the tapered guiding holes 110 and is connected with the anchor nut 120, the prestressed steel rod 300 in the lower positioning plate 500 is sleeved with a spiral rib 310, and the spiral rib 310 is welded and fixed below the anchor pad 100.

The contact surfaces among the prestress steel bar 300, the anchor nut 120 and the anchor backing plate 100 are all metal surfaces, and a layer of friction material is arranged between the anchor nut 120 and the anchor backing plate 100.

Claims (9)

1. An improved prestressed anchorage assembly comprising an anchorage backing plate (100), one or more prestressed steel bars (300) fixed to the anchorage backing plate (100) by means of anchorage nuts (120), characterized in that: the lower end face of the anchoring nut (120) is processed into a spherical shape and is matched with a spherical countersunk head guide through hole (110) arranged on the anchoring base plate (100), and self-adaptive adjustment is completed in the process of applying prestress so as to maintain uniform stress, verticality and concentricity indexes of the anchoring nut (120), the anchoring base plate (100) and the prestress steel rod (300).

2. The improved pre-stressed anchor assembly of claim 1, wherein: the spherical countersunk head guide through hole (110) is a cambered surface of a lower semicircle part of the sphere.

3. The improved pre-stressed anchor assembly of claim 1, wherein: the upper end face of the anchor nut (120) is provided with a matched anchor baffle (200), a prestress steel rod (300) penetrates through the anchor baffle (200) and the anchor backing plate (100), and meanwhile the anchor backup nut (210) locks the anchor baffle (200) on the upper end face of the anchor nut (120).

4. An improved pre-stressed anchor assembly as recited in claim 3, wherein: the prestress steel bar (300) is sleeved with a spiral rib (310), and the prestress steel bar (300) is perpendicular to the anchoring base plate (100) and concentric with the anchoring nut (120).

5. An improved pre-stressed anchor assembly as recited in claim 3, wherein: the lower part of the spherical countersunk head guide through hole (110) on the anchoring base plate (100) is a cylindrical hole perpendicular to the anchoring base plate (100), and the junction of the spherical surface part and the cylindrical surface part is provided with a chamfer.

6. The improved pre-stressed anchor assembly of any of claims 1-5, wherein: the prestress anchoring component is arranged in the anchor hole (400) and is matched with a formed hole sleeve (410), and the prestress steel bar (300) is sleeved with a spiral rib (310).

7. The improved pre-stressed anchor assembly of claim 6, wherein: wherein the anchor pad (100) is welded to the pocket sleeve (410) to secure the prestressed anchor assembly in the concrete structure.

8. An improved pre-stressed anchor assembly as recited in claim 3, wherein: the lower U-shaped locating plate (500) is arranged below the anchoring base plate (100), through holes (510) which are concentric with the spherical countersunk head guide through holes (110) and are matched in number are arranged on the U-shaped lower locating plate (500), and the prestress steel rod (300) penetrates through the through holes (510) and the spherical countersunk head guide through holes (110) and is connected with the anchoring nuts (120).

9. The pre-stressed anchor assembly of claim 1, wherein: the contact surfaces among the prestress steel bar (300), the anchor nut (120) and the anchor backing plate (100) are all metal surfaces, and a layer of friction material is arranged between the anchor nut (120) and the anchor backing plate (100).