CN216238084U - High-strength prestress system suitable for railway bridge - Google Patents

Abstract

The utility model relates to a high-strength prestress system suitable for a railway bridge, which comprises a prestress steel strand, a first cast-forming anchor backing plate, a second cast-forming anchor backing plate, a first anchor plate, a second anchor plate, a first clamping piece, a second clamping piece, a first spiral rib and a second spiral rib, wherein the first cast-forming anchor backing plate, the first anchor plate and the first clamping piece anchor one end of the prestress steel strand, the second cast-forming anchor backing plate, the second anchor plate and the second clamping piece anchor the other end of the prestress steel strand, the first spiral rib is coaxially arranged at the periphery of the first cast-forming anchor backing plate, and the second spiral rib is coaxially arranged at the periphery of the second cast-forming anchor backing plate. The utility model has high fatigue resistance, is increased to more than 100MPa from the national common stress amplitude of 80MPa, and is suitable for the internal and external prestress of the railway bridge. The prestressed steel strand can be prefabricated into a bundle in a factory and installed by penetrating the whole bundle on site; or weaving into bundles on site and mounting the whole bundle in a penetrating manner; or a mode of splitting, threading and installing and the like.

Description

High-strength prestress system suitable for railway bridge

Technical Field

The utility model relates to the field of a prestress system, in particular to a high-strength prestress system suitable for a railway bridge.

Background

At present, with the continuous promotion of bridge construction at home and abroad, the requirement on the bridge per se is higher and higher. On the premise of meeting the traffic requirement to the maximum extent, the use amount of engineering materials such as concrete, steel and the like is required to be reduced so as to achieve the purposes of reducing the construction cost, reducing the energy consumption and the like.

Meanwhile, for example, in China, with the continuous progress of infrastructure, roads are more and more dense, and lines with different traffic demands are overlapped in a crossed manner, such as crossing high-speed railway lines, overhead lines in cities and the like. When the routes are overlapped, strict requirements are provided for the bridge span, and the span of a part of viaduct bridges must be designed to be larger due to the limitation of construction conditions so as to meet the passing requirements of vehicles and ships under the bridges.

In the existing bridge, a prestressed system mainly aiming at reducing the section size of a member and increasing the span of the bridge cannot meet the engineering requirements slowly. The steel strand is used as the most common prestressed tendon in a prestressed system, is widely applied at home and abroad, and has the common specification of 1860MPa grade steel strands with the thickness of 1x 7-15.20 mm. There is a need for a high strength steel strand and a corresponding prestressing system to meet the existing engineering requirements.

Disclosure of Invention

The utility model aims to solve the problem that a high-strength prestressed steel strand and a matched anchoring system thereof are blank in the prior art, and provides a high-strength prestressed system suitable for a railway bridge.

The utility model provides a high-strength prestress system applicable to a railway bridge, which comprises a prestress strand, a first cast-forming anchor backing plate, a second cast-forming anchor backing plate, a first anchor plate, a second anchor plate, a first clamping piece, a second clamping piece, a first spiral rib and a second spiral rib, wherein the first cast-forming anchor backing plate, the first anchor plate and the first clamping piece anchor one end of the prestress strand, the second cast-forming anchor backing plate, the second anchor plate and the second clamping piece anchor the other end of the prestress strand, the first spiral rib is coaxially arranged at the periphery of the first cast-forming anchor backing plate, and the second spiral rib is coaxially arranged at the periphery of the second cast-forming anchor backing plate; the first cast anchor backing plate comprises a first end plate and a first cylinder, the first end plate and the first cylinder are coaxially arranged, the first end plate is arranged at one end of the first cylinder, the radial interface of the first end plate is circular, the diameter of the section of the first end plate is larger than or equal to the diameter of the contact position of the first cylinder and the first end plate, at least three column bases are arranged on the inner side of the maximum diameter of one surface, connected with the first cylinder, of the first end plate, the column bases are wedge-shaped, and the upper surfaces of the column bases are perpendicular to the axis; the first cylinder comprises a first cylinder body, a first reinforcing ring rib and a second reinforcing ring rib, the first cylinder body is of a cylindrical structure, the outer side surface of the first cylinder body is provided with the first reinforcing ring rib and the second reinforcing ring rib, the first reinforcing ring rib is arranged on the inner side of the cylinder opening at the free end of the first cylinder body in the axial direction, and the second reinforcing ring rib is arranged between the first reinforcing ring rib and the first end plate; the second cast anchor backing plate comprises a second end plate and a second cylinder, the second end plate and the second cylinder are coaxially arranged, the second end plate is arranged at one end of the second cylinder, the radial interface of the second end plate is circular, the diameter of the section of the second end plate is larger than or equal to the diameter of the contact position of the second cylinder and the second end plate, at least three column bases are arranged on the inner side of the maximum diameter of one surface, connected with the second cylinder, of the second end plate, the column bases are wedge-shaped, and the upper surfaces of the column bases are perpendicular to the axis; the second barrel comprises a second barrel body, a third reinforcing ring rib and a fourth reinforcing ring rib, the second barrel body is of a cylindrical structure, the third reinforcing ring rib and the fourth reinforcing ring rib are arranged on the outer side face of the second barrel body, the third reinforcing ring rib is arranged on the inner side of the axis direction of the free end barrel opening of the second barrel body, and the fourth reinforcing ring rib is arranged between the third reinforcing ring rib and the second end plate.

The utility model relates to a high-strength prestress system applicable to a railway bridge, which is characterized in that the strength of a prestress steel strand is any one of the following: 1960 MPa-2060 MPa, 2000 MPa-2100 MPa, 2100 MPa-2200 MPa, 2200 MPa-2300 MPa, 2300 MPa-2400 MPa or 2400 MPa-2500 MPa.

The utility model relates to a high-strength prestress system applicable to a railway bridge, which is characterized in that as an optimal mode, a first clamping piece is arranged inside a first anchor plate, a first anchor backing plate is arranged at the end part of the bridge, and the first anchor plate is closely attached to the first anchor backing plate through anchoring prestress steel strands; the first anchor plate comprises a first anchor plate body and at least one first taper hole, the first anchor plate body is a pie-shaped cylinder, the first taper hole penetrates through two end faces of the cylinder, and the axis of the first taper hole is parallel to the axis of the first anchor plate body; the first taper hole comprises a first outer surface taper hole and a first inner surface taper hole, the first outer surface taper hole and the first inner surface taper hole are coaxially arranged and are connected at the head, and the first outer surface taper hole is used for installing the first clamping piece.

The utility model relates to a high-strength prestress system applicable to a railway bridge, which is characterized in that as an optimal mode, a second clamping piece is arranged inside a second anchor plate, a second anchor backing plate is arranged at the end part of the bridge, and the second anchor plate is closely attached to the second anchor backing plate through anchoring prestress steel strands; the second anchor plate comprises a second anchor plate body and at least one second taper hole, the second anchor plate body is a pie-shaped cylinder, the second taper hole penetrates through two end faces of the cylinder, and the axis of the second taper hole is parallel to the axis of the second anchor plate body; the second taper hole comprises a second outer surface taper hole and a second inner surface taper hole, the second outer surface taper hole and the second inner surface taper hole are coaxially arranged and are connected at the head, and the second outer surface taper hole is used for installing the second clamping piece.

The utility model relates to a high-strength prestress system applicable to a railway bridge, which is characterized in that as a preferred mode, a first clamping piece comprises a first clamping piece body and two first deformation grooves with the same size, the first clamping piece body is of a hollow conical structure formed by axially splicing two sections, a through hole is formed in the center of the first clamping piece body, the through hole is coaxial with a cone, the maximum diameter of the through hole is smaller than or equal to the minimum diameter of the cone, the two first deformation grooves are respectively and correspondingly arranged at the lower bottoms of the two sections of the cone, the direction of the first deformation grooves is parallel to the axis of the cone, and the two first deformation grooves are symmetrically arranged by taking the axis as a symmetry axis.

The utility model relates to a high-strength prestress system applicable to a railway bridge, which is characterized in that as a preferred mode, a second clamping piece comprises a second clamping piece body and two second deformation grooves with the same size, the second clamping piece body is of a hollow conical structure formed by axially splicing two sections, a through hole is formed in the center of the second clamping piece body, the through hole is coaxial with a cone, the maximum diameter of the through hole is smaller than or equal to the minimum diameter of the cone, the two second deformation grooves are respectively and correspondingly arranged at the lower bottoms of the two sections of the cone, the directions of the second deformation grooves are parallel to the axis of the cone, and the two second deformation grooves are symmetrically arranged by taking the axis as a symmetry axis.

According to the high-strength prestress system applicable to the railway bridge, as an optimal mode, the through hole at the small-diameter position of the first clamping piece body is a first conical through hole which is enlarged from inside to outside; the angle of the first conical through hole is 0-20 degrees; the inner wall of the first conical through hole is provided with a screw thread; the diameter of the connecting position of the first outer surface taper hole and the first inner surface taper hole is the same, and the diameter of a circle at the connecting position of the first outer surface taper hole and the first inner surface taper hole is the minimum diameter of the first outer surface taper hole and the minimum diameter of the first inner surface taper hole; the angle matching difference between the first outer surface taper hole and the first clamping piece body is 10 'to 50'; a cylindrical through hole is arranged between the first outer surface taper hole and the first inner surface taper hole, and the diameter of the first cylindrical through hole is the same as the minimum diameter of the first outer surface taper hole and the minimum diameter of the first inner surface taper hole; a first clamping piece clamping groove is formed in the side face of the inner side of the maximum diameter of the first clamping piece body, and the first clamping piece clamping groove is an annular groove with the circle center on the first axis.

According to the high-strength prestress system applicable to the railway bridge, as an optimal mode, the through hole at the small-diameter position of the second clamping piece body is a second conical through hole which is enlarged from inside to outside; the angle of the second conical through hole is 0-20 degrees; the inner wall of the second conical through hole is provided with a screw thread; the diameter of the connecting position of the second outer surface taper hole and the second inner surface taper hole is the same, and the diameter of the circle at the connecting position of the second outer surface taper hole and the second inner surface taper hole is the minimum diameter of the second outer surface taper hole and the minimum diameter of the second inner surface taper hole; the angle fit difference between the second outer surface taper hole and the second clamping piece body is 10 'to 50'; a cylindrical through hole is arranged between the second outer surface taper hole and the second inner surface taper hole, and the diameter of the second cylindrical through hole is the same as the minimum diameter of the second outer surface taper hole and the minimum diameter of the second inner surface taper hole; a second clamping piece clamping groove is formed in the side face of the inner side of the maximum diameter of the second clamping piece body, and the second clamping piece clamping groove is an annular groove with the circle center on the second axis.

As an optimal mode, the first cast anchor backing plate and the second cast anchor backing plate can be made of cast steel, grey cast iron and nodular cast iron.

The utility model relates to a high-strength prestress system applicable to railway bridges, which is characterized in that a prestress steel strand is composed of a plurality of steel wires which are twisted with each other as an optimal mode, and the specific requirements of wire rods used for manufacturing the steel wires are as follows:

wire rod brand and chemical composition

Mechanical property of wire rod

Required sorbite content of wire rod

Delivery status	Minimum value of sorbite content
		Hot-rolled air-cooled wire rod and hot-rolled water-bath wire rod	87％
Hot-rolled heat-treated wire rod	90％

Wire rod net cementite and central martensite grade requirements

Grade of non-metallic inclusions in wire rod

The high-strength prestress system applicable to the railway bridge is used as an optimal mode, and the raw material strength and toughness performance indexes of the anchor plate of the steel strand of 2000MPa and below are not lower than the requirement of No. 45 steel in GB/T699, and the raw material strength and toughness performance indexes of the anchor plate of the steel strand of 2100MPa and above are not lower than the requirement of No. 40Cr steel in GB/T3077;

the anchor is suitable for the anchorage of the steel strand of 2000MPa grade and below, the anchor plate should be subjected to quenching and tempering heat treatment (quenching and high-temperature tempering), and the surface hardness of the anchor plate should be 20 HRC-30 HRC (225 HB-286 HB when the quality is cut); the clip is subjected to chemical heat treatment, and the surface hardness is 79 HRA-83 HRA;

the anchor is suitable for the anchorage of steel strands of 2100MPa grade and above, the anchor plate is subjected to quenching and tempering heat treatment (quenching and high-temperature tempering), and the surface hardness of the anchor plate is 26 HRC-36 HRC (257 HB-336 HB when the quality is cut); the clip should be chemically heat treated and the surface hardness should be 81 HRA-85 HRA.

The utility model has the following beneficial effects:

(1) the circular end plate is adopted, so that the stress distribution is more uniform, and the advantages in the load transmission aspect are obviously improved;

(2) the two circumferential ribs on the conical cylinder can effectively increase the bonding effect between the high-strength anchor backing plate and the concrete and increase the load transferring effect of the anchor backing plate;

(3) the added supporting feet can not only enhance the strength of the whole structure of the anchor backing plate, but also effectively transmit the prestress load borne by the end plate part of the high-strength anchor backing plate to the lower part, thereby achieving the effect that the high-strength anchor backing plate can effectively transmit the prestress load transmitted by the anchorage device to the concrete uniformly while the strength of the high-strength anchor backing plate is enough to bear the prestress load transmitted by the anchorage device;

(4) the clamping piece is a two-petal conical clamping piece, and the deformation groove is arranged, so that the clamping piece has enough deformation capacity to release high stress brought by the anchor and the steel strand pair clamping piece when the stress is high, and the steel strand can be clamped more uniformly through self deformation;

(5) the inner hole at the small diameter part of the conical clamping piece is processed into a conical shape which is expanded from inside to outside, and the stress release cone which is added at the small diameter part of the clamping piece can ensure that the clamping piece can not be damaged due to the large stress brought to one side of the clamping piece by the deflection of a steel strand when the clamping piece is matched with an anchorage device and an anchor backing plate for use, and simultaneously ensure the static load anchoring efficiency coefficient and the fatigue performance of an anchoring system;

(6) the proper angle fit difference between the clamping piece and the anchor plate can provide enough anchoring force for the anchoring unit of the clamping piece of the anchor plate, and meanwhile, the internal shrinkage of the clamping piece under the condition of large load can be ensured not to exceed a specified range, and the prestress loss of an anchoring system is ensured to be optimal;

(7) the first release taper hole and the second release taper hole are connected through a straight hole, and the stress release taper hole added on the anchor plate can also reduce the shearing force of the anchorage device on the steel strand caused by the installation deflection of the steel strand, so that the damage of the shearing force on the steel strand caused by high stress and steel strand deflection in the use process of the high-strength steel strand is prevented;

(8) the steel strand with the strength of 1960 MPa-2060 MPa, 2000 MPa-2100 MPa, 2100 MPa-2200 MPa, 2200 MPa-2300 MPa, 2300 MPa-2400 MPa or 2400 MPa-2500 MPa is adopted, the fatigue resistance is high, the stress amplitude of 80MPa commonly used in China is increased to more than 100MPa, and the steel strand is suitable for the internal and external prestress of the railway bridge and meets the existing engineering requirements.

Drawings

FIG. 1 is a schematic view of a high strength pre-stressed system for railroad bridges;

FIG. 2 is a schematic view of a first cast anchor pad of a high strength pre-stressed system for railroad bridges;

FIG. 3 is a schematic view of a first cylinder of a high strength pre-stressed system for railroad bridges;

FIG. 4 is a schematic view of a second cast anchor pad adapted for a high strength pre-stressed system of railroad bridges;

FIG. 5 is a schematic view of a second cylinder of a high strength pre-stressed system for railroad bridges;

FIG. 6 is a schematic view of a first anchor plate of a high strength pre-stressed system for railroad bridges;

FIG. 7 is a schematic view of a first cone hole of a high strength pre-stressed system for railroad bridges;

FIG. 8 is a schematic view of a second anchor plate of a high strength pre-stressed system for railroad bridges;

FIG. 9 is a schematic view of a second taper hole of the high strength prestressing system for railroad bridges;

FIG. 10 is a schematic view of a first clip of a high strength pre-stressed system for railroad bridges;

fig. 11 is a schematic view of a second clip of a high strength pre-stressed system for railroad bridges.

Reference numerals:

1. pre-stressed steel strands; 2. a first cast anchor backing plate; 21. a first end plate; 22. a first cylinder; 221. a first barrel body; 222. a first stiffening ring rib; 223. a second stiffening ring rib; 3. second casting and forming the anchor backing plate; 31. a second end plate; 32. a second cylinder; 321. a second cylinder body; 322. a third stiffening ring rib; 323. a fourth stiffening ring rib; 4. a first anchor plate; 41. a first anchor pad body; 42. a first taper hole; 421. a first outer surface taper hole; 422. a first inner surface taper hole; 5. a second anchor plate; 51. a second anchor pad body; 52. a second taper hole; 521. a second outer surface taper hole; 522. a second inner surface taper hole; 6. a first clip piece; 61. a first clip body; 62. a first deformation groove; 7. a second clip; 71. a second clip body; 72. and a second deformation groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example 1

As shown in fig. 1, a high strength prestressing force system who is adapted to railroad bridge, including prestressing steel strand 1, first cast forming anchor backing plate 2, second cast forming anchor backing plate 3, first anchor slab 4, second anchor slab 5, first clamping piece 6, second clamping piece 7, first spiral muscle 8 and second spiral muscle 9, first cast forming anchor backing plate 2, first anchor slab 4 and first clamping piece 6 anchor prestressing steel strand 1 one end, second cast forming anchor backing plate 3, the other end of second anchor slab 5 and second clamping piece 7 anchor prestressing steel strand 1, first spiral muscle 8 coaxial setting is in first cast forming anchor backing plate 2 periphery, second spiral muscle 9 coaxial setting is in second cast forming anchor backing plate 3 periphery. First clamping piece 6 sets up inside first anchor slab 4, and first cast molding anchor backing plate 2 sets up in the bridge tip, and first anchor slab 4 passes through anchor prestress wire 1 and pastes first cast molding anchor backing plate 2 closely. The second clamping piece 7 is arranged inside the second anchor plate 5, the second cast anchor backing plate 3 is arranged at the end part of the bridge, and the second anchor plate 5 is closely attached to the second cast anchor backing plate 3 through the anchoring prestressed steel strand 1. The strength of the prestressed steel strand 1 is any one of the following: 1960 MPa-2060 MPa, 2000 MPa-2100 MPa, 2100 MPa-2200 MPa, 2200 MPa-2300 MPa, 2300 MPa-2400 MPa or 2400 MPa-2500 MPa.

As shown in fig. 2, the first cast anchor backing plate 2 includes a first end plate 21 and a first cylinder 22, the first end plate 21 and the first cylinder 22 are coaxially disposed, the first end plate 21 is disposed at one end of the first cylinder 22, the radial interface of the first end plate 21 is circular, the diameter of the cross section of the first end plate 21 is greater than or equal to the diameter of the contact position between the first cylinder 22 and the first end plate 21, at least three column bases are disposed on the inner side of the maximum diameter of the first end plate 21, which is connected with one side of the first cylinder 22, the column bases are wedge-shaped, and the upper surface of the column bases is perpendicular to the axis.

As shown in fig. 3, the first cylinder 22 includes a first cylinder body 221, a first reinforcing ring rib 222 and a second reinforcing ring rib 223, the first cylinder body 221 is a cylinder structure, the outer side surface of the first cylinder body 221 is provided with the first reinforcing ring rib 222 and the second reinforcing ring rib 223, the first reinforcing ring rib 222 is arranged on the inner side of the cylinder opening axis direction at the free end of the first cylinder body 221, and the second reinforcing ring rib 223 is arranged between the first reinforcing ring rib 222 and the first end plate 21.

As shown in fig. 4, the second cast anchor backing plate 3 includes a second end plate 31 and a second cylinder 32, the second end plate 31 and the second cylinder 32 are coaxially disposed, the second end plate 31 is disposed at one end of the second cylinder 32, the radial interface of the second end plate 31 is circular, the diameter of the cross section of the second end plate 31 is greater than or equal to the diameter of the contact position between the second cylinder 32 and the second end plate 31, at least three column bases are disposed inside the maximum diameter of the second end plate 31 connected to one side of the second cylinder 32, the column bases are wedge-shaped, and the upper surface of the column bases is perpendicular to the axis.

As shown in fig. 5, the second cylinder 32 includes a second cylinder body 321, a third reinforcing ring rib 322 and a fourth reinforcing ring rib 323, the second cylinder body 321 is a cylindrical structure, the outer side of the second cylinder body 321 is provided with the third reinforcing ring rib 322 and the fourth reinforcing ring rib 323, the third reinforcing ring rib 322 is disposed on the inner side of the free end cylinder mouth axis direction of the second cylinder body 321, and the fourth reinforcing ring rib 323 is disposed between the third reinforcing ring rib 322 and the second end plate 31.

As shown in fig. 6, the first anchor plate 4 includes a first anchor plate body 41 and at least one first taper hole 42, the first anchor plate body 41 is a pie-shaped cylinder, and the first taper hole 42 penetrates through two end faces of the cylinder and has an axis parallel to an axis of the first anchor plate body 41.

As shown in fig. 7, the first taper hole 42 includes a first outer surface taper hole 421 and a first inner surface taper hole 422, the first outer surface taper hole 421 and the first inner surface taper hole 422 are coaxially disposed and are connected end to end, and the first outer surface taper hole 421 is used for installing the first clip 6.

As shown in fig. 8, the second anchor plate 5 includes a second anchor plate body 51 and at least one second taper hole 52, the second anchor plate body 51 is a pie-shaped cylinder, and the second taper hole 52 penetrates through two end faces of the cylinder and has an axis parallel to the axis of the second anchor plate body 51.

As shown in fig. 9, the second taper hole 52 includes a second outer taper hole 521 and a second inner taper hole 522, the second outer taper hole 521 and the second inner taper hole 522 are coaxially disposed and connected end to end, the second outer taper hole 521 is used for installing the second clip 7

As shown in fig. 10, the first clip 6 includes a first clip body 61 and two first deformation grooves 62 with the same size, the first clip body 61 is a hollow cone with a through hole arranged at the center, the through hole is coaxial with the cone, the maximum diameter of the through hole is smaller than or equal to the minimum diameter of the cone, the two first deformation grooves 62 are respectively arranged at the bottom of the cone, the direction of the first deformation groove 62 is parallel to the cone axis, and the two first deformation grooves 62 are symmetrically arranged by taking the axis as the symmetry axis.

As shown in fig. 11, the second clip 7 includes a second clip body 71 and two second deformation grooves 72 with the same size, the second clip body 71 is a hollow cone with a through hole arranged at the center, the through hole is coaxial with the cone, the maximum diameter of the through hole is smaller than or equal to the minimum diameter of the cone, the two second deformation grooves 72 are respectively arranged at the bottom of the cone, the direction of the second deformation groove 72 is parallel to the cone axis, and the two second deformation grooves 72 are symmetrically arranged with the axis as the symmetry axis.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims (9)

1. A high strength prestressing force system who is adapted to railway bridge, its characterized in that: comprises prestressed steel strands (1), a first cast anchor backing plate (2), a second cast anchor backing plate (3), a first anchor plate (4), a second anchor plate (5), a first clamping piece (6), a second clamping piece (7), a first spiral rib (8) and a second spiral rib (9), the first cast anchor backing plate (2), the first anchor plate (4), the first clamping piece (6) and the first spiral rib (8) anchor one end of the prestressed steel strand (1), the second cast anchor backing plate (3), the second anchor plate (5), the second clamping piece (7) and the second spiral rib (9) anchor the other end of the prestressed steel strand (1), the first spiral rib (8) is coaxially arranged at the periphery of the first cast anchor backing plate (2), the second spiral ribs (9) are coaxially arranged on the periphery of the second cast anchor backing plate (3); the first cast anchor backing plate (2) comprises a first end plate (21) and a first cylinder (22), the first end plate (21) and the first cylinder (22) are coaxially arranged, the first end plate (21) is arranged at one end of the first cylinder (22), the radial interface of the first end plate (21) is circular, the diameter of the section of the first end plate (21) is larger than or equal to the diameter of the contact position of the first cylinder (22) and the first end plate (21), at least three column feet are arranged on the inner side of the maximum diameter of the surface, connected with the first cylinder (22), of the first end plate (21), the column feet are wedge-shaped, and the upper surface of each column foot is perpendicular to the axis; the first cylinder (22) comprises a first cylinder body (221), a first reinforcing ring rib (222) and a second reinforcing ring rib (223), the first cylinder body (221) is of a cylindrical structure, the first reinforcing ring rib (222) and the second reinforcing ring rib (223) are arranged on the outer side face of the first cylinder body (221), the first reinforcing ring rib (222) is arranged on the inner side of the cylinder opening of the free end of the first cylinder body (221), and the second reinforcing ring rib (223) is arranged between the first reinforcing ring rib (222) and the first end plate (21); the second cast anchor backing plate (3) comprises a second end plate (31) and a second cylinder (32), the second end plate (31) and the second cylinder (32) are coaxially arranged, the second end plate (31) is arranged at one end of the second cylinder (32), the radial interface of the second end plate (31) is circular, the diameter of the section of the second end plate (31) is larger than or equal to the diameter of the contact position of the second cylinder (32) and the second end plate (31), at least three column feet are arranged on the inner side of the maximum diameter of the surface, connected with the second cylinder (32), of the second end plate (31), the column feet are wedge-shaped, and the upper surfaces of the column feet are perpendicular to the axis; the second cylinder (32) comprises a second cylinder body (321), a third reinforcing ring rib (322) and a fourth reinforcing ring rib (323), the second cylinder body (321) is of a cylindrical structure, the third reinforcing ring rib (322) and the fourth reinforcing ring rib (323) are arranged on the outer side face of the second cylinder body (321), the third reinforcing ring rib (322) is arranged on the inner side of the axis direction of a free end cylinder opening of the second cylinder body (321), and the fourth reinforcing ring rib (323) is arranged between the third reinforcing ring rib (322) and the second end plate (31).

2. The high-strength prestressed system for railroad bridges of claim 1, wherein: the strength of the prestressed steel strand (1) is any one of the following: 1960 MPa-2060 MPa, 2000 MPa-2100 MPa, 2100 MPa-2200 MPa, 2200 MPa-2300 MPa, 2300 MPa-2400 MPa or 2400 MPa-2500 MPa.

3. The high-strength prestressed system for railroad bridges of claim 1, wherein: the first clamping piece (6) is arranged inside the first anchor plate (4), the first anchor backing plate is arranged at the end part of the bridge, and the first anchor plate (4) is closely attached to the first anchor backing plate through anchoring the prestressed steel strand (1); the first anchor plate (4) comprises a first anchor plate body (41) and at least one first taper hole (42), the first anchor plate body (41) is a pie-shaped cylinder, the first taper hole (42) penetrates through two end faces of the cylinder, and the axis of the first taper hole is parallel to the axis of the first anchor plate body (41); the first taper hole (42) comprises a first outer surface taper hole (421) and a first inner surface taper hole (422), the first outer surface taper hole (421) and the first inner surface taper hole (422) are coaxially arranged and are connected in an initial position, and the first outer surface taper hole (421) is used for installing the first clamping piece (6).

4. The high-strength prestressed system for railroad bridges of claim 1, wherein: the second clamping piece (7) is arranged inside the second anchor plate (5), the second anchor backing plate is arranged at the end part of the bridge, and the second anchor plate (5) is closely attached to the second anchor backing plate through anchoring the prestressed steel strand (1); the second anchor plate (5) comprises a second anchor plate body (51) and at least one second taper hole (52), the second anchor plate body (51) is a pie-shaped cylinder, the second taper hole (52) penetrates through two end faces of the cylinder, and the axis of the second taper hole is parallel to the axis of the second anchor plate body (51); the second taper hole (52) comprises a second outer surface taper hole (521) and a second inner surface taper hole (522), the second outer surface taper hole (521) and the second inner surface taper hole (522) are coaxially arranged and are connected in an initial position, and the second outer surface taper hole (521) is used for installing the second clamping piece (7).

5. The high-strength prestressed system for railroad bridges of claim 3, wherein: the first clamping piece (6) comprises a first clamping piece body (61) and two first deformation grooves (62) with the same size, the first clamping piece body (61) is a hollow conical structure formed by axially splicing two sections, a through hole is formed in the center of the first clamping piece body, the through hole is coaxial with the cone, the maximum diameter of the through hole is smaller than or equal to the minimum diameter of the cone, the two first deformation grooves (62) are correspondingly arranged at the lower bottom positions of the two conical sections, the direction of the first deformation grooves (62) is parallel to the axis of the cone, and the two first deformation grooves (62) are symmetrically arranged by taking the axis as a symmetry axis; the through hole at the small-diameter position of the first clamping piece body (61) is a first conical through hole which is enlarged from inside to outside; the angle of the first conical through hole is 0-20 degrees; the inner wall of the first conical through hole is provided with a screw thread; the diameters of the connecting positions of the first outer surface taper hole (421) and the first inner surface taper hole (422) are the same, and the diameter of a circle at the connecting position of the first outer surface taper hole (421) and the first inner surface taper hole (422) is the minimum diameter of the first outer surface taper hole (421) and the minimum diameter of the first inner surface taper hole (422); the angle fit difference between the first outer surface taper hole (421) and the first clamping piece body (61) is 10 'to 50'; a cylindrical through hole is arranged between the first outer surface taper hole (421) and the first inner surface taper hole (422), and the diameter of the cylindrical through hole is the same as the minimum diameter of the first outer surface taper hole (421) and the minimum diameter of the first inner surface taper hole (422); a first clamping piece clamping groove is formed in the side face of the inner side of the maximum diameter of the first clamping piece body (61), and the first clamping piece clamping groove is an annular groove with the circle center on the axis.

6. The high-strength prestressed system for railroad bridges of claim 4, wherein: the second clamping piece (7) comprises a second clamping piece body (71) and two second deformation grooves (72) with the same size, the second clamping piece body (71) is a hollow conical structure formed by axially splicing two sections, a through hole is formed in the center of the second clamping piece body, the through hole is coaxial with the cone, the maximum diameter of the through hole is smaller than or equal to the minimum diameter of the cone, the two second deformation grooves (72) are correspondingly arranged at the lower bottom positions of the two conical sections, the direction of the second deformation grooves (72) is parallel to the axis of the cone, the two second deformation grooves (72) are symmetrically arranged by taking the axis as a symmetry axis, and the through hole in the small-diameter position of the second clamping piece body (71) is a second conical through hole which is enlarged from inside to outside; the angle of the second conical through hole is 0-20 degrees; the inner wall of the second conical through hole is provided with a screw thread; the through hole at the small-diameter position of the second clamping piece body (71) is a second conical through hole which is enlarged from inside to outside; the angle of the second conical through hole is 0-20 degrees; the inner wall of the second conical through hole is provided with a screw thread; the diameters of the connecting positions of the second outer surface taper hole (521) and the second inner surface taper hole (522) are the same, and the diameter of a circle at the connecting position of the second outer surface taper hole (521) and the second inner surface taper hole (522) is the minimum diameter of the second outer surface taper hole (521) and the minimum diameter of the second inner surface taper hole (522); the angle fit difference between the second outer surface taper hole (521) and the second clip body (71) is 10 'to 50'; a cylindrical through hole is formed between the second outer surface taper hole (521) and the second inner surface taper hole (522), and the diameter of the cylindrical through hole is the same as the minimum diameter of the second outer surface taper hole (521) and the minimum diameter of the second inner surface taper hole (522); a second clamping piece clamping groove is formed in the side face of the inner side of the maximum diameter of the second clamping piece body (71), and the second clamping piece clamping groove is an annular groove with the circle center on the axis.

7. The high-strength prestressed system for railroad bridges of claim 1, wherein: the first cast-forming anchor backing plate (2) and the second cast-forming anchor backing plate (3) are made of cast steel, grey cast iron or nodular cast iron.

8. The high-strength prestressed system for railroad bridges of claim 2, wherein: when the first anchor plate (4) and the second anchor plate (5) are suitable for the prestressed steel strand (1) of 2000MPa and below, the strength and toughness performance indexes of the used raw materials are not lower than the requirement of No. 45 steel in GB/T699;

when the first anchor plate (4) and the second anchor plate (5) are suitable for the 2100 MPa-grade or above prestressed steel strand (1), the strength and toughness performance indexes of the used raw materials are not lower than the requirements of 40Cr steel in GB/T3077;

when the first anchor plate (4) and the second anchor plate (5) are suitable for the prestressed steel strand (1) with the pressure of 2000MPa and below, quenching and high-temperature tempering are carried out, the surface hardness of the first anchor plate (4) and the second anchor plate (5) is 20 HRC-30 HRC, and the mass cutting time is 225 HB-286 HB; when the first clamping piece (6) and the second clamping piece (7) are suitable for the prestressed steel strand (1) of 2000MPa and below, chemical heat treatment is carried out, and the surface hardness is 79 HRA-83 HRA;

when the first anchor plate (4) and the second anchor plate (5) are adapted to the prestressed steel strand (1) with the pressure of 2100MPa and above, quenching and high-temperature tempering are carried out, the surface hardness is 26 HRC-36 HRC, and the quality is 257 HB-336 HB when the quality is cut; the first clamping piece (6) and the second clamping piece (7) are subjected to chemical heat treatment, and the surface hardness is 81 HRA-85 HRA;

the prestressed steel strand (1) can be installed by prefabricated finished product bundles in a factory and whole bundle penetration in a field; or weaving into bundles on site and mounting the whole bundle in a penetrating manner; or a mode of splitting, threading and installing and the like.

9. A high strength pre-stressed system according to claim 1, wherein: the inner holes of the small diameter parts of the first clamping piece (6) and the second clamping piece (7) are processed into conical shapes which are expanded from inside to outside, the position, corresponding to the small diameter end of the first clamping piece (6), of the first anchor plate (4) is provided with a stress release cone of 0-20 degrees, and the position, corresponding to the small diameter end of the second clamping piece (7), of the second anchor plate (5) is provided with a stress release cone of 0-20 degrees.

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