A structure for improving the anchorage performance of the arch foot of a trussed steel tube concrete arch bridge

Abstract

The present invention discloses a structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge, which belongs to the field of steel tube concrete arch bridges, and includes an anchor box, wherein a plurality of main arch steel tubes are inserted through the anchor box, and a plurality of reinforcing ribs are arranged on the outer side of each main arch steel tube, wherein the reinforcing ribs are arranged by passing through the anchor box, an annular cover plate is arranged on the upper side of the anchor box, wherein the annular cover plate is sleeved on the outer side of the main arch steel tube, an internal threaded pipe is arranged on the lower side of the annular cover plate, wherein the internal threaded pipe is rotatably mounted on the top plate of the anchor box through a limiting slip ring, an external threaded pipe is fixed on the bottom wall of the annular cover plate, wherein the external threaded pipe is threadedly mounted with the internal threaded pipe, and a plurality of sleeves are also fixed on the bottom wall of the anchor box. The arch foot anchoring structure of the arch bridge of this scheme can realize the stable anchoring of the arch foot, and the structural form is simpler, and it is safe and stable after anchoring, and the connection points in the anchor box can avoid being corroded by air and rainwater, and it is safe and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of steel tube concrete arch bridges, and in particular to a structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge. Background Art

[0002] Steel tube concrete is a type of steel-concrete composite structure. Steel tube concrete arch bridges are made by filling steel tubes with concrete. The radial constraints of the steel tubes limit the expansion of the compressed concrete, making the concrete in a three-dimensional compression state, thereby significantly improving the compressive strength of the concrete. At the same time, the steel tubes have the functions of longitudinal main reinforcement and transverse hoop, and can also be used as construction templates to facilitate concrete pouring. During the construction process, the steel tubes can be used as rigid load-bearing skeletons. The welding work is simple and the hoisting weight is light, which can simplify the construction process and shorten the construction period.

[0003] After searching, Chinese patent number CN 103643634 B discloses an arch foot anchoring structure of a steel tube concrete arch bridge, including an anchor box, a flange located outside the anchor box, and a stiffening plate connecting the anchor box and the flange. The main arch rib steel pipe of the arch bridge passes through the flange and the anchor box top plate in sequence and enters the anchor box. The stiffening plate is connected to the outer wall of the main arch rib steel pipe.

[0004] The arch foot anchoring structure in the prior art has the following disadvantages: the structure of the anchoring structure is relatively complex and cumbersome, and the connection points between the flange on the upper side of the anchor box and the main arch steel pipe, prestressed tendons and anchor bolts are exposed to the air, and a separate sealing cover needs to be set for sealing; at the same time, the flange and the top plate of the anchor box are also connected by a stiffening plate, and the stiffening plate and the sealing cover cooperate with each other to ensure the stability of the flange and the anchor box and the main arch steel pipe, which increases the structural cost. In addition, a PBL shear key is set in the anchor box to increase the shear resistance, but it cannot increase the overall anchoring strength of the anchoring structure. Therefore, the existing anchoring structure needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to solve the defects in the prior art and to propose a structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge, comprising an anchor box, wherein a plurality of main arch steel tubes are inserted through the anchor box, and a plurality of reinforcing ribs are arranged on the outer side of each main arch steel tube, the reinforcing ribs are arranged by passing through the anchor box, an annular cover plate is arranged on the upper side of the anchor box, the annular cover plate is sleeved on the outer side of the main arch steel tube, an internally threaded tube is arranged on the lower side of the annular cover plate, the internally threaded tube is rotatably mounted on the top plate of the anchor box through a limiting slip ring, an externally threaded tube is fixed on the bottom wall of the annular cover plate, the externally threaded tube and the internally threaded tube are threadedly mounted, a plurality of sleeves are also fixed on the bottom wall of the anchor box, and the sleeves are all located on the inner side of the externally threaded tube, the top end of the reinforcing rib extends into the sleeve, a flange is also fixed to the interior of the anchor box through a support rod, and the flange is sleeved on the outer side of the main arch steel tube and the reinforcing ribs.

[0008] Furthermore, four main arch steel pipes are inserted through the anchor box, and six reinforcing ribs are arranged on the outer side of each main arch steel pipe.

[0009] Furthermore, the annular cover plate is provided with a sleeve hole, and is sleeved on the outer side of the main arch steel pipe through the sleeve hole.

[0010] Furthermore, four flanges are provided inside the anchor box, and each flange is fixed to the inner top wall of the anchor box through four support rods.

[0011] Furthermore, a sealing ring is fixed on the bottom wall of the annular cover plate, and the sealing ring is located outside the external threaded tube and corresponds to the top end of the internal threaded tube.

[0012] Furthermore, the bottom end of the internally threaded tube is folded inwards, the top end of the limiting slip ring is folded outwards, and the bottom end of the internally threaded tube is slidably mounted with the top end of the limiting slip ring via a ball.

[0013] Furthermore, the sealing ring is made of rubber.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The anchor box and the arch foot end of the main arch steel pipe are anchored by installing and fixing the internal and external threaded pipes and cooperating with the flange in the anchor box and the main arch steel pipe.

[0016] 2. After installation, the internal threaded pipe and the external threaded pipe can be sealed by a sealing ring to prevent air and rainwater from corroding the connection between the main arch steel pipe and the anchor box. The structure is simpler, safer and more stable.

[0017] In summary, the arch foot anchoring structure of the arch bridge of this scheme can achieve stable anchoring of the arch foot, the structural form is simpler, and it is safe and stable after anchoring. The connection points in the anchor box can avoid being corroded by air and rainwater, and are safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of a structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge proposed by the present invention;

[0020] Figure 2 A schematic diagram of the internal structure of a structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge proposed by the present invention;

[0021] Figure 3 A top view of a structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge proposed by the present invention;

[0022] Figure 4 A bottom view of a structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge proposed by the present invention;

[0023] Figure 5 The invention proposes a structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge. Figure 2 A magnified view of the structure of part a;

[0024] Figure 6 It is a schematic diagram of the bottom surface of the annular cover plate and the externally threaded tube in the present invention.

[0025] In the figure: 1 anchor box, 2 main arch steel pipe, 3 annular cover plate, 4 internal threaded pipe, 5 sealing ring, 6 reinforcing ribs, 7 flange, 8 support rod, 9 external threaded pipe, 10 limit slip ring, 11 casing, 12 sleeve hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Reference Figure 1-6A structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge includes an anchor box 1, a plurality of main arch steel tubes 2 are inserted through the anchor box 1, and a plurality of reinforcing ribs 6 are provided on the outer side of each main arch steel tube 2. The reinforcing ribs 6 are provided by passing through the anchor box 1. In this embodiment, four main arch steel tubes 2 are inserted through the anchor box 1, and six reinforcing ribs 6 are provided on the outer side of each main arch steel tube 2.

[0029] An annular cover plate 3 is provided on the upper side of the anchor box 1 , and the annular cover plate 3 is sleeved on the outer side of the main arch steel pipe 2 . The annular cover plate 3 is provided with a sleeve hole 12 , and is sleeved on the outer side of the main arch steel pipe 2 through the sleeve hole 12 .

[0030] An internal threaded tube 4 is provided on the lower side of the annular cover plate 3, and the internal threaded tube 4 is rotatably mounted on the top plate of the anchor box 1 through a limit slip ring 10. The bottom end of the internal threaded tube 4 is folded inward, and the top end of the limit slip ring 10 is folded outward. The bottom end of the internal threaded tube 4 is slidably mounted through a ball bearing and the top end of the limit slip ring 10. An external threaded tube 9 is fixed on the bottom wall of the annular cover plate 3, and the external threaded tube 9 is threadedly mounted on the internal threaded tube 4.

[0031] A plurality of sleeves 11 are also fixed on the bottom wall of the anchor box 1, and the sleeves 11 are all located inside the external threaded tube 9, and the top of the reinforcing rib 6 extends into the sleeve 11. A flange 7 is also fixed inside the anchor box 1 through a support rod 8, and the flange 7 is sleeved on the outside of the main arch steel pipe 2 and the reinforcing rib 6. In this embodiment, four flanges 7 are provided inside the anchor box 1, and each flange 7 is fixed to the inner top wall of the anchor box 1 through four support rods 8.

[0032] A sealing ring 5 is fixed on the bottom wall of the annular cover plate 3. The sealing ring 5 is located outside the external threaded tube 9 and corresponds to the top end of the internal threaded tube 4. The sealing ring 5 is made of rubber.

[0033] The working principle and use process of the present invention are as follows: the anchor box 1 and the arch seat are cast and fixed, the main arch steel pipe 2 is inserted into the anchor box 1, the main arch steel pipe 2 is sleeved with an annular cover plate 3, the lower side of the annular cover plate 3 is provided with an internal threaded pipe 4, an external threaded pipe 9 is fixed on the bottom wall of the annular cover plate 3, the external threaded pipe 9 and the internal threaded pipe 4 are threadedly installed, and after installation, the top end of the internal threaded pipe 4 squeezes the sealing ring 5 to form a seal.

[0034] A flange 7 is placed on the main arch steel pipe 2 and the reinforcing ribs 6 inside the anchor box 1 , and the flange 7 is fixed to the inner wall of the anchor box 1 through a support rod 8 , and the main arch steel pipe 2 and the reinforcing ribs 6 are fixed to the flange 7 by welding.

[0035] Figure 1 The two main arch steel pipes 2 on the left side are under tension, while the two main arch steel pipes 2 on the right side are under compression. They are fixed by the installation of the internal threaded pipe 4 and the external threaded pipe 9, and fixed with the flange 7 in the anchor box 1 and the main arch steel pipe 2 to achieve the anchoring of the anchor box 1 and the arch foot end of the main arch steel pipe 2.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge, comprising an anchor box (1), characterized in that: A plurality of main arch steel pipes (2) are inserted through the anchor box (1), and a plurality of reinforcing ribs (6) are provided on the outer side of each main arch steel pipe (2), and the reinforcing ribs (6) are provided by penetrating the anchor box (1). An annular cover plate (3) is provided on the upper side of the anchor box (1), and the annular cover plate (3) is sleeved on the outer side of the main arch steel pipe (2). An internally threaded pipe (4) is provided on the lower side of the annular cover plate (3), and the internally threaded pipe (4) is rotatably mounted on the top plate of the anchor box (1) through a limiting slip ring (10). An externally threaded tube (9) is fixed on the bottom wall of the annular cover plate (3), and the externally threaded tube (9) is threadedly installed with the internally threaded tube (4). A plurality of sleeves (11) are also fixed on the bottom wall of the anchor box (1), and the sleeves (11) are all located on the inner side of the externally threaded tube (9). The top end of the reinforcing rib (6) extends into the sleeve (11). A flange (7) is also fixed inside the anchor box (1) via a support rod (8), and the flange (7) is sleeved on the outer sides of the main arch steel tube (2) and the reinforcing rib (6).

2. The structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge according to claim 1, characterized in that: Four main arch steel pipes (2) are inserted through the anchor box (1), and six reinforcing ribs (6) are arranged on the outer side of each main arch steel pipe (2).

3. The structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge according to claim 1, characterized in that: The annular cover plate (3) is provided with a sleeve hole (12), and is sleeved on the outer side of the main arch steel pipe (2) through the sleeve hole (12).

4. A structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge according to claim 1 or 2, characterized in that: Four flanges (7) are arranged inside the anchor box (1), and each flange (7) is fixed to the inner top wall of the anchor box (1) via four support rods (8).

5. The structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge according to claim 1, characterized in that: A sealing ring (5) is fixed on the bottom wall of the annular cover plate (3), and the sealing ring (5) is located outside the external threaded tube (9) and corresponds to the top end of the internal threaded tube (4).

6. The structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge according to claim 1, characterized in that: The bottom end of the internally threaded tube (4) is folded inwards, and the top end of the limiting slip ring (10) is folded outwards. The bottom end of the internally threaded tube (4) is slidably mounted on the top end of the limiting slip ring (10) via a ball.

7. The structure for improving the anchoring performance of the arch foot of a trussed steel tube concrete arch bridge according to claim 5, characterized in that: The sealing ring (5) is made of rubber.

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