Through-type steel pipe concrete arch bridge

Abstract

The utility model discloses a kind of through steel pipe concrete arch bridges, and the left and right sides along the length direction of arch bridge are respectively provided with several hangers, the hanger is used to connect arch body and deck, the hanger is steel cable hanger, short hanger near arch bridge arch foot position uses left and right parallel double short hanger group, and double short hanger group unilateral is at least two groups, the rest long hanger uses single hanger, compared to the hanger reinforcing structure lacking arch foot hanger, the present application designs at least two pairs of double hanger groups of front and rear interval near arch foot, greatly reduce the possibility of short hanger fracture near arch foot position, the utility model has double hanger system, structural stability is strong and the like advantages.

Description

Technical Field

[0001] This utility model belongs to the field of arch bridge technology, specifically relating to a bottom-bearing steel-concrete composite arch bridge. Background Technology

[0002] like Figure 1 As shown, in a through-type steel-concrete composite arch bridge, the suspender connects the upper arch body (a) to the lower bridge deck (b). Its main function is to suspend the bridge deck system and transfer the load of the bridge deck system within the main span to the main arch ring. Through-type steel-concrete composite arch bridges generally use flexible suspenders. As one of the most important load-bearing components in the support system of through-type steel-concrete composite arch bridges, suspenders are absent in traditional arch bridges. Once defects or damage occur, even if the arch ribs remain intact, it will still cause damage to the bridge deck system, thus rendering the entire bridge unusable. Suspensions, especially short ones, have unclear stress distribution. Suspensions in through-type steel-concrete composite arch bridges are generally vertically installed, bearing only axial tensile force. The upper end of the suspender is fixed to the arch body (a), and the lower end is anchored to the bridge deck (b). When the temperature changes, the upper end of the suspender displaces along the arch back curve, and the lower end displaces horizontally along the arch chord. Misalignment inevitably occurs at the upper and lower ends, resulting in additional stress at the fixed points due to local deflection. Therefore, short hangers are more prone to breakage, and the adverse effects of a short hanger breakage at the arch foot are far greater than those of a long hanger elsewhere. However, in order to save costs, the systems and anchoring structures of long and short hangers are currently the same, which means that the short hangers at the arch foot are usually set as a single unit, just like the long hangers, thus lacking a reinforcement structure for the arch foot hangers. Utility Model Content

[0003] The present invention aims to provide a bottom-bearing steel-concrete composite arch bridge, which enhances the structural strength of the arch foot hangers and solves the problem that the lack of hanger reinforcement for the arch foot hangers leads to a significant impact on the structural strength of the bridge if a short hanger breaks.

[0004] Therefore, the technical solution adopted by this utility model is as follows: a bottom-bearing steel-concrete arch bridge, wherein a number of hangers are respectively set on the left and right sides along the length of the arch bridge. The hangers are used to connect the arch body and the bridge deck. The hangers are steel cable hangers. The short hangers near the arch foot of the arch bridge adopt a double short hanger group with the left and right sides arranged side by side, and there are at least two groups of double short hangers on each side. The remaining long hangers adopt single hangers.

[0005] As a preferred embodiment of the above scheme, the bottom end of the short suspender is anchored to the steel crossbeam of the bridge deck via corresponding anchor plates. The lower part of the anchor plate has an installation notch for engaging with the web of the steel crossbeam and is fixed to the steel crossbeam by welding. Stiffening plate assemblies are symmetrically welded to the left and right sides and front and back of the anchor plate. The stiffening plate assemblies have a contact surface with the steel crossbeam and are welded thereto. The upper part of the anchor plate has an anchoring notch, and a sleeve limiting device for the bottom end of the short suspender to pass vertically through is installed from top to bottom within the anchoring notch. The components include anchor plates for fixing and tensioning short suspension rod bottom anchors. The sleeve limiting assembly includes an upper sleeve, a connecting plate, and a lower sleeve from top to bottom. The anchor plate is horizontally welded to the lower end of the lower sleeve. A drainage groove is provided on the upper surface of the anchor plate. The stiffening plate assembly includes an upper stiffening plate and a lower stiffening plate. The top of the upper stiffening plate is welded to the bottom surface of the connecting plate, and the bottom end is welded to the top surface of the steel crossbeam top plate. The top of the lower stiffening plate is welded to the bottom surface of the steel crossbeam top plate, and the outer edge of the bottom end is chamfered.

[0006] The anchor plate structure is designed according to strength requirements to ensure multiple welds between the anchor plate and the steel beam, thereby ensuring the stable installation of the anchor plate and the steel beam. The upper surface of the anchor plate is provided with a drainage groove to prevent water from corroding the weld over a long period of time and affecting the structural stability.

[0007] The sleeve limiting assembly is used to ensure that the anchor at the bottom of the boom passes vertically, ensuring the verticality of the boom. The anchor plate is welded to the bottom of the sleeve limiting assembly and is used to fix and tension the boom anchor. The structure is interlocked and reasonably designed to strengthen the anchoring structure and ensure the anchoring effect.

[0008] A further preferred embodiment is that the drainage trough is a semi-circular arc-shaped trough with a diameter of 10mm to 12mm, which is reasonably designed and facilitates water diversion.

[0009] More preferably, the anchoring notch has an overall "convex" shape with an open top. The connecting plate has welding notches on the front and rear sides for inserting the anchor plate, thus fixing it to the narrow end of the anchoring notch. The wide end of the anchoring notch has semi-circular grooves at the front and rear. The structure is reasonably designed to avoid collision between the bottom anchor of the jack and the anchor plate. The semi-circular grooves can also help to hook and lift the jack during transportation.

[0010] A further preferred embodiment is that the top of the anchor plate is tapered inward to form a conical structure, and the top is symmetrically provided with lifting holes at the front and back. Widening cylinders are installed on the left and right sides of the lifting holes to facilitate handling, lifting and lowering. The anchor plate and the lower sleeve are welded by fillet welding, which ensures a firm weld.

[0011] The beneficial effects of this utility model are as follows: Compared with the suspension rod reinforcement structure that lacks arch foot suspension rods, this application designs at least two pairs of double suspension rod groups with front and rear intervals near the arch foot, which greatly reduces the possibility of short suspension rods breaking near the arch foot. This utility model has the advantages of double suspension rod system and strong structural stability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a steel-concrete composite arch bridge with a lower deck.

[0013] Figure 2 This utility model is shown in the schematic diagram of the transverse bridge structure installed on the steel crossbeam.

[0014] Figure 3 This is a schematic diagram of the anchor plate along the bridge direction.

[0015] Figure 4 This is a schematic diagram of the main structure of the anchor plate. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0017] Combination Figure 1 — Figure 4 As shown, a type of under-deck steel-concrete composite arch bridge has several suspenders installed on the left and right sides along the length of the arch bridge. The suspenders are used to connect the arch body a and the bridge deck b, and the suspenders are steel cable suspenders c.

[0018] The short hangers 2 near the arch foot of the arch bridge are made up of two short hanger groups arranged side by side, with at least two groups on each side. The remaining long hangers are made up of single hangers.

[0019] The bottom end of the short suspender 2 is anchored to the steel crossbeam 1 of the bridge deck through corresponding anchor plates 3.

[0020] The lower part of the anchor plate 3 is provided with an installation notch 31 for inserting into the web of the steel crossbeam 1, and is fixed to the steel crossbeam 1 by welding.

[0021] An anchoring notch 32 is provided on the upper part of the anchor plate 3.

[0022] The anchoring notch 32 has a convex shape with an opening at the top.

[0023] The top of the wide end of the anchoring notch 32 is provided with semi-circular grooves 321 at the front and back.

[0024] An anchor plate 34 for fixing and tensioning the bottom anchor 21 of the short rod 2 is installed from top to bottom in the anchoring notch 32.

[0025] The connecting plate 34 has welding notches on both the front and rear sides for inserting into the anchor plate 3, thereby fixing it to the narrow end of the anchoring notch 32.

[0026] The sleeve limiting assembly 33 consists of an upper sleeve 331, a connecting plate 332, and a lower sleeve 333, arranged from top to bottom.

[0027] The anchor plate 34 is horizontally welded to the bottom end of the lower sleeve 333.

[0028] The anchor plate 34 and the lower sleeve 333 are preferably welded by fillet welding.

[0029] The upper surface of the anchor plate 34 is provided with a drainage groove 341, which is preferably a semi-circular arc groove with a diameter of 10mm to 12mm.

[0030] The anchor plate 3 has stiffening plate components 35 welded symmetrically on the left and right sides and front and back.

[0031] The stiffening plate assembly 35 has a contact surface with the steel crossbeam 1 and is welded.

[0032] The stiffening plate assembly 35 consists of an upper stiffening plate 351 and a lower stiffening plate 352.

[0033] The top of the stiffening plate 351 on the beam is welded to the bottom of the connecting plate 34, and the bottom is welded to the top of the top plate of the steel crossbeam 1.

[0034] The top of the stiffening plate 352 under the beam is welded to the bottom surface of the top plate of the steel crossbeam 1, and the bottom edge is chamfered.

[0035] The top of the anchor plate 3 is tapered inward to form a conical structure, and the top is symmetrically provided with lifting holes 36. Widening cylinders are installed on the left and right sides of the lifting holes 36.

[0036] First, the anchor plate 3 is processed in the factory. The sleeve limiting component 33 and the anchor plate 34 are welded to the designed position of the anchor plate 3. When the beam is constructed on site to the section with the hanger anchor, the two anchor plates 3 are hoisted to the corresponding position side by side so that the installation notch 31 is inserted into the web of the steel beam 1. Then, the stiffening plate component 35 and the top plate of the steel beam 1 are welded. Finally, corresponding to the two anchor plates 3, the bottom end of the short hanger 2 passes through the corresponding anchor plate 3, and the hanger tensioning end anchor is installed. The tensioning of the short hanger 2 is completed on the bridge deck using a light jack.

Claims

1. A type of under-deck steel-concrete composite arch bridge, wherein a plurality of suspenders are respectively arranged on the left and right sides along the length of the arch bridge, the suspenders being used to connect the arch body and the bridge deck, and the suspenders being steel cable suspenders, characterized in that: The short hangers (2) near the arch foot of the arch bridge are made of double short hanger groups arranged side by side, and there are at least two groups on each side of the double short hanger groups. The remaining long hangers are made of single hangers.

2. The under-deck steel-concrete composite arch bridge according to claim 1, characterized in that: The bottom end of the short suspender (2) is anchored to the steel crossbeam (1) of the bridge deck by corresponding anchor plates (3). The lower part of the anchor plate (3) is provided with an installation notch (31) for inserting into the web of the steel crossbeam (1) and is fixed to the steel crossbeam (1) by welding. The anchor plate (3) is symmetrically welded with stiffening plate assemblies (35) on the left and right sides and front and back. The stiffening plate assembly (35) has a contact surface with the steel crossbeam (1) and is welded. The upper part of the anchor plate (3) is provided with an anchoring notch (32). The anchoring notch (32) is installed from top to bottom with a sleeve limiting assembly (33) for the bottom end of the short suspender (2) to pass vertically through and an anchor (2) for fixing and tensioning the bottom end of the short suspender (2). 1) Anchor plate (34), the sleeve limiting assembly (33) includes an upper sleeve (331), a connecting plate (332), and a lower sleeve (333) from top to bottom. The anchor plate (34) is horizontally welded to the lower end of the lower sleeve (333). The upper surface of the anchor plate (34) is provided with a drainage groove (341). The stiffening plate assembly (35) includes an upper stiffening plate (351) and a lower stiffening plate (352). The top end of the upper stiffening plate (351) is welded to the bottom surface of the connecting plate (332), and the bottom end is welded to the top surface of the top plate of the steel beam (1). The top end of the lower stiffening plate (352) is welded to the bottom surface of the top plate of the steel beam (1), and the outer edge of the bottom end is provided with a chamfer.

3. A steel-concrete composite arch bridge with a lower deck as described in claim 2, characterized in that: The drainage trough (341) is a semi-circular arc-shaped trough with a diameter of 10mm to 12mm.

4. A steel-concrete composite arch bridge with a lower deck as described in claim 2, characterized in that: The anchoring notch (32) is a convex structure with an open top. The connecting plate (332) has welding notches on the front and rear sides for inserting the anchor plate (3), thereby fixing it to the narrow end of the anchoring notch (32). The top of the wide end of the anchoring notch (32) has semi-circular grooves (321).

5. A steel-concrete composite arch bridge with a lower deck as described in claim 2, characterized in that: The top of the anchor plate (3) is tapered inward to form a conical structure, and the top is symmetrically provided with lifting holes (36). Widening cylinders are installed on the left and right sides of the lifting holes (36). The anchor plate (34) and the lower sleeve (333) are welded by fillet welding.

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