Swivel construction method of continuous beam bridge based on novel spherical hinge

Abstract

The invention relates to a swivel construction method of a continuous beam bridge based on a novel spherical hinge, and belongs to the technical field of bridge construction. S1, main pier construction; s2, lower spherical hinge pouring is conducted, specifically, a lower spherical hinge supporting formwork is arranged on the top face of the main pier, then concrete is poured into the supporting formwork, and after pouring is completed, a spherical mold is arranged on the top face of a lower spherical hinge in a pressing mode; s3, a rotating ball is installed, after pouring of the lower spherical hinge is completed, the spherical mold is dismantled, a containing groove is formed in the position of the spherical mold, and the rotating ball is installed in the containing groove; s4, secondary concrete pouring of the lower spherical hinge is conducted, specifically, a spherical mold with the same size as the rotating ball is placed around the rotating ball, the rotating ball is sleeved with the spherical mold, secondary concrete pouring is conducted, and the lower spherical hinge is formed; s5, pouring an upper spherical hinge; s6, bridge construction; s7, dismantling the temporary section steel; s8, rotating is conducted; the problems that the construction efficiency is low and potential safety hazards are increased due to the fact that friction force of upper and lower rotating discs is too large during construction of an existing continuous beam rotating method are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a rotation construction method of a continuous beam bridge based on a novel ball joint. Background Art

[0002] Bridge construction often needs to cross existing railways, highways, canyons and other places. Due to the restrictions of transportation or the inability to carry out construction work above these places, the prefabrication of the beam must be used for construction. At present, the construction of this type of bridge mainly adopts the beam push or rotation construction method. The beam push construction is divided into two types: horizontal push and vertical push. Both methods require the construction of temporary piers and temporary slideways. The lower part of the beam is placed on a special slider, which is connected to the tensioning jack on the opposite side through a wire rope. During the push construction, the beam is slowly moved to the position of the beam by traction by the jack. This method is difficult to construct and time-consuming and labor-intensive. Another method is to adopt the rotation construction method, that is, the bridge is made on one side of the railway or highway, and the bridge is rotated into place by a rotation device. The rotation method can better avoid the impact on other lines of transportation, overcome the difficulties of erecting large-span bridges in high mountain canyons, deep and fast water or rivers with frequent ship navigation, especially for the construction of urban overpasses and railway overpasses with busy transportation. Its advantages are more obvious.

[0003] The continuous beam rotation construction method requires the use of a ball joint, which is generally assembled from an upper and lower turntable. When the continuous beam rotates, the upper and lower turntables rotate relative to each other, which will generate a large friction force, resulting in the need for operators to provide a large traction force through traction equipment, which in turn increases the construction safety risk and reduces the efficiency of the rotation construction. The existing construction method generally uses a method of setting friction-reducing materials between the upper and lower turntables during the continuous beam rotation casting process to reduce friction. However, this method is not only time-consuming and labor-intensive, but also has an ineffective effect in reducing friction. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a rotation construction method for a continuous beam bridge based on a new ball joint, which solves the problem of excessive friction between the upper and lower turntables during construction of the existing continuous beam rotation method, resulting in low construction efficiency and increased safety hazards.

[0005] The purpose of the present invention can be achieved by the following technical solution: A rotation construction method of a continuous beam bridge based on a new type of ball joint comprises the following steps:

[0006] S1: Construction of the main pier, pouring the inverted support feet, anchor legs and temporary steel on the top of the main pier;

[0007] S2: Casting of the lower ball joint: setting the lower ball joint support formwork on the top surface of the main pier, and then pouring concrete on the support formwork. After the pouring is completed, press and set the spherical mold on the top surface of the lower ball joint;

[0008] S3: Install the rotating sphere. After the lower spherical joint is cast, remove the spherical mold, form a receiving groove at the position of the spherical mold, and install the rotating sphere in the receiving groove;

[0009] S4: Secondary concrete pouring of the lower spherical joint: a spherical mold with the same size as the rotating sphere is placed around the rotating sphere, the rotating sphere is fitted, and concrete is poured for the second time to form the lower spherical joint;

[0010] S5: Casting of the upper ball joint, casting the upper ball joint and connecting it with the lower ball joint to form a ball joint assembly;

[0011] S6: Bridge construction, install the turntable, beam bottom slide, rotating drum and tensioning platform at the bottom of the bridge, and cast the top of the temporary steel section at the bottom of the bridge;

[0012] S7: Remove the temporary steel, install a traction rope on the anchor leg, wrap it around the rotating drum and install it on the tensioning platform, connect the rotating drum with the ball joint assembly, and then remove the temporary steel;

[0013] S8: Rotation, pulling the traction cable through the tensioning platform, driving the turntable at the bottom of the bridge to rotate around the center of the ball joint assembly.

[0014] As a preferred technical solution of the present invention, in step S6, the beam bottom slide is an annular structure, which is arranged on the bottom surface of the bridge and wrapped around the outer wall surface of the turntable.

[0015] As a preferred technical solution of the present invention, in step S6, a plurality of rotating drums are provided and arranged in a ring shape around the center of the bottom of the bridge.

[0016] As a preferred technical solution of the present invention, in step S6, two tensioning platforms are provided, and the two tensioning platforms are symmetrically arranged around the center of the bottom of the bridge.

[0017] As a preferred technical solution of the present invention, two traction cables are provided, one end of the traction cable is fixedly mounted on the anchor leg, and the other end is mounted on a tensioning platform away from the anchor leg, and the traction cable surrounds half of the rotating drum on the main pier.

[0018] As a preferred technical solution of the present invention, the number of the anchoring legs is two and they are symmetrically arranged, and the projection angle between the position of one of the anchoring legs and the adjacent tensioning platform is ≤45°.

[0019] As a preferred technical solution of the present invention, the inverted support leg includes two support columns and a support plate arranged on the top surface of the support column, and the gap between the top surface of the support plate and the slideway at the bottom of the beam is 1-2 cm.

[0020] As a preferred technical solution of the present invention, the shape of the rotating sphere is spherical, and four fifths of the volume of the rotating sphere is located in the accommodating groove.

[0021] As a preferred technical solution of the present invention, the swivel ball joint also includes a positioning device, the central axis of the positioning device coincides with the central axis of the upper ball joint, and a positioning shaft is provided at the central axis of the lower ball joint, and the positioning shaft is rotatably connected to the positioning device at the central axis of the positioning device.

[0022] The beneficial effects of the present invention are as follows: in the process of completing the construction of the swivel through the ball joint assembly, and in the process of rotating the continuous beam, the rotation process of the upper ball joint is transmitted to the rotation of the rotating ball in the receiving groove, thereby weakening the original sliding friction between the upper and lower ball joints and turning it into the rotational friction of the rotating ball in the receiving groove. This change in friction properties can greatly reduce the friction between the upper and lower ball joints, and solves the problem of low construction efficiency and increased safety hazards caused by excessive friction between the upper and lower turntables during the construction of the existing continuous beam rotation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a flow chart of the construction method of the present invention;

[0025] Figure 2 This is a schematic diagram of the installation structure of the ball joint assembly of the present invention;

[0026] Figure 3 It is a schematic diagram of the rotating sphere structure of the present invention;

[0027] Main component symbols

[0028] In the figure: 1. Bridge; 2. Upper ball joint; 3. Lower ball joint; 4. Rotating sphere; 5. Positioning shaft; 6. Receiving groove. DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0030] See also Figure 1-Figure 3 This embodiment provides a rotation construction method of a continuous beam bridge based on a novel ball joint, comprising the following steps:

[0031] S1: Construction of the main pier, pouring the inverted support feet, anchor legs and temporary steel on the top of the main pier;

[0032] S2: Casting of the lower ball joint 3, setting the support formwork of the lower ball joint 3 on the top surface of the main pier, and then pouring concrete on the support formwork. After the pouring is completed, a spherical mold is pressed on the top surface of the lower ball joint 3;

[0033] S3: installing the rotating sphere 4. After the lower spherical joint 3 is cast, the spherical mold is removed, a receiving groove 6 is formed at the position of the spherical mold, and the rotating sphere 4 is installed in the receiving groove 6;

[0034] S4: Secondary concrete pouring of the lower spherical joint 3, placing a spherical mold of the same size as the rotating sphere 4 around the rotating sphere 4, fitting the rotating sphere 4, and pouring concrete for the second time to form the lower spherical joint 3;

[0035] S5: Casting the upper ball joint 2, casting the upper ball joint 2 and connecting it with the lower ball joint 3 to form a ball joint assembly;

[0036] S6: Construction of Bridge 1: Install the turntable, beam bottom slideway, rotating drum and tensioning platform at the bottom of Bridge 1, and cast the top of the temporary steel section at the bottom of Bridge 1;

[0037] S7: Remove the temporary steel, install a traction rope on the anchor leg, wrap it around the rotating drum and install it on the tensioning platform, connect the rotating drum with the ball joint assembly, and then remove the temporary steel;

[0038] S8: Rotation: pulling the traction cable through the tensioning platform to drive the turntable at the bottom of the bridge 1 to rotate around the center of the ball joint assembly.

[0039] By casting the lower ball joint 3 twice, the lower ball joint 3 is formed into a receiving groove 6 by setting a spherical mold during the second casting, and then the rotating ball 4 is installed in the receiving groove 6 to form the lower ball joint 3, and then the upper ball joint 2 forms a ball joint assembly with the lower ball joint 3 according to the normal construction method, and then the bridge 1 that needs to be rotated is connected to the ball joint assembly through a turntable, a beam bottom slide, a rotating drum and a tensioning platform. The ball joint assembly is used to complete the rotation construction process. In the process of rotating the continuous beam, the rotation process of the upper ball joint 2 is transmitted to the rotation of the rotating ball 4 in the receiving groove 6, thereby weakening the original sliding friction between the upper and lower ball joints 3 into the rotation friction of the rotating ball 4 in the receiving groove 6. This change in friction properties can greatly reduce the friction between the upper and lower ball joints 3, and solves the problem of excessive friction between the upper and lower turntables during the construction of the existing continuous beam rotation method, resulting in low construction efficiency and increased safety hazards.

[0040] In order to ensure that the bridge 1 can slide smoothly during the rotation process, in this embodiment, in step S6, the bottom beam slide is an annular structure, which is arranged on the bottom surface of the bridge 1 and wrapped around the outer wall surface of the turntable. The bottom beam slide is designed to be annular, so that it can be arranged around the outer wall surface of the turntable to form a continuous sliding path, so that the bridge 1 can slide smoothly when it rotates under the traction of the traction cable, so that the bridge 1 is both stable and efficient during the rotation process.

[0041] In order to improve the stability of the rotation of the bridge 1 and disperse the load during the rotation process, in one embodiment, in step S6, a plurality of rotating drums are provided and arranged in a ring shape around the bottom center of the bridge 1. Since the rotation of the bridge 1 is completed by the tensioning platform through the traction rope around the rotating drum during the rotation construction, the rotating drum is arranged in a ring shape around the bottom center of the bridge 1 to provide uniform support and rotational force, increase the stability of the bridge 1 during the rotation process, and prevent the bridge 1 from tilting or shaking during rotation. At the same time, the rotating drum can reduce the friction generated by the traction rope during the traction process, improve the traction effect, and thus improve the efficiency and safety of the rotation.

[0042] In order to ensure the stability and balance of the bridge 1 during the rotation process, in one embodiment, in step S6, two tensioning platforms are provided, and the two tensioning platforms are symmetrically arranged around the bottom center of the bridge 1. The two tensioning platforms can provide balanced traction during the rotation process. The two platforms work simultaneously to provide synchronous traction, thereby avoiding displacement or distortion of the bridge 1 caused by uneven traction force. In addition, symmetrical traction can reduce resistance during the rotation process and improve the efficiency and speed of the rotation.

[0043] In order to ensure that the rotation construction of the bridge 1 can be completed accurately and smoothly, in one embodiment, two traction cables are provided, one end of the traction cable is fixedly mounted on the anchor leg, and the other end is mounted on a tensioning platform away from the anchor leg. The traction cable surrounds half of the rotating drum on the main pier. During the traction rotation process, the rotation angle of the bridge 1 is usually less than or equal to 90°. Therefore, in order to ensure that the bridge 1 can smoothly complete the rotation construction, it is necessary to ensure that the tensioning platform can pull the bridge 1 to a rotation angle greater than 90° during tensioning. Therefore, during the installation of the traction cable, the traction cable is connected to the tensioning platform, then surrounds at least half of the rotating drum and is connected to the anchor leg, thereby ensuring that the tensioning platform can ensure that the rotation angle of the bridge 1 is greater than 90° during the tensioning and rotation of the bridge 1, thereby ensuring that the bridge 1 can smoothly complete the rotation construction.

[0044] In order to ensure that the bridge 1 can rotate according to the predetermined trajectory and speed, in one embodiment, the number of anchor legs is two and they are symmetrically arranged. The position of one anchor leg and the projection angle of a tensioning platform adjacent to it are ≤45°. Since the tensioning platform is arranged on the bottom surface of the bridge 1, when the bridge 1 rotates, the tensioning platform is connected to the anchor legs after the traction cable is wrapped around the rotating drum. Therefore, when tensioning to complete the rotation, the anchor legs are used as support points. The two anchor legs are symmetrically arranged, which can ensure that the tensioning force of the two tensioning platforms can be balanced during tensioning, ensuring the rotation stability of the bridge 1. Since the traction cable is connected to the anchor legs, the tensioning platform is connected to the anchor legs. The legs are on the tensioning platform with a large distance between them, and the tensioning platform and the anchor legs are symmetrically arranged. Therefore, when the projected angle between the anchor leg and the adjacent tensioning platform is ≤45°, it means that the projected angle of the tensioning platform connected to the anchor leg is ≥135°, and the traction cable is connected to the anchor leg and the tensioning platform by wrapping around half of the rotating drum. Therefore, the traction cable is a large circle wrapped around the turntable to complete the connection. Therefore, the angle between the anchor leg and the connected tensioning platform should be ≤225°. Therefore, the longer the traction distance of the traction cable, the easier it is to control the traction accuracy. Therefore, the rotation construction of Bridge 1 can be successfully completed and the stability of Bridge 1 during the rotation process is guaranteed.

[0045] In order to ensure the safety of the bridge 1 during the rotation construction, in one embodiment, the inverted support leg includes two support columns and a support plate arranged on the top surface of the support column, and the gap between the top surface of the support plate and the slideway at the bottom of the beam is 1-2 cm. By setting the gap between the top surface of the support plate and the slideway at the bottom of the beam to 1-2 cm, the rotation of the bridge 1 will not be affected during the rotation construction, and the stable support effect can be improved when the bridge 1 is tilted during the rotation construction, thereby avoiding the bridge 1 from falling.

[0046] In order to, in one embodiment, the shape of the rotating ball 4 is spherical, and four-fifths of the volume of the rotating ball 4 is located in the accommodating groove 6. Since the upper ball joint 2 is rotatably connected to the lower ball joint 3 through the rotating ball 4, only a small part of the rotating ball 4 is leaked out of the surface of the lower ball joint 3 to connect with the upper ball joint 2. This ensures that the rotating ball 4 will not produce position deviation during the rotation process. At the same time, the volume of the rotating part is relatively large, which provides a more stable support for the rotating ball 4, and can more effectively disperse and withstand the force and torque from the rotating ball, thereby improving the load-bearing capacity of the entire upper ball joint 2 and the rotating ball 4 combination.

[0047] In order to ensure the accuracy of the bridge 1 during the rotation process, in one embodiment, the swivel ball joint also includes a positioning device, and the central axis of the positioning device coincides with the central axis of the upper ball joint 2. A positioning shaft 5 is provided at the central axis of the lower ball joint 3. The positioning shaft 5 is rotatably connected to the above-mentioned positioning device at the central axis of the positioning device. The positioning shaft 5 is connected to the positioning device, and the central axis of the positioning device coincides with the central axis of the upper ball joint 2. Therefore, the rotation center of the positioning device and the rotation center of the upper ball joint 2 are the same point. In this way, it can be ensured that the rotation of the entire swivel ball joint system is symmetrical and uniform. At the same time, the positioning device provides positioning and limiting functions to ensure the accuracy and stability of the rotational motion and avoid positioning errors during the rotation construction of the bridge 1.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A rotation construction method for a continuous beam bridge based on a new type of ball joint, characterized in that: The following steps are involved: S1: Construction of the main pier, pouring the inverted support feet, anchor legs and temporary steel on the top of the main pier; S2: Casting of the lower ball joint: setting the lower ball joint support formwork on the top surface of the main pier, and then pouring concrete on the support formwork. After the pouring is completed, press and set the spherical mold on the top surface of the lower ball joint; S3: Install the rotating sphere. After the lower spherical joint is cast, remove the spherical mold, form a receiving groove at the position of the spherical mold, and install the rotating sphere in the receiving groove; S4: Secondary concrete pouring of the lower spherical joint: a spherical mold with the same size as the rotating sphere is placed around the rotating sphere, the rotating sphere is fitted, and concrete is poured for the second time to form the lower spherical joint; S5: Casting of the upper ball joint, casting the upper ball joint and connecting it with the lower ball joint to form a ball joint assembly; S6: Bridge construction, install the turntable, beam bottom slide, rotating drum and tensioning platform at the bottom of the bridge, and cast the top of the temporary steel section at the bottom of the bridge; S7: Remove the temporary steel, install a traction rope on the anchor leg, wrap it around the rotating drum and install it on the tensioning platform, connect the rotating drum with the ball joint assembly, and then remove the temporary steel; S8: Rotation, pulling the traction cable through the tensioning platform, driving the turntable at the bottom of the bridge to rotate around the center of the ball joint assembly.

2. The rotation construction method of a continuous beam bridge based on a novel ball joint according to claim 1 is characterized in that: In step S6, the beam bottom slideway is a ring-shaped structure, which is arranged on the bottom surface of the bridge and is wound around the outer wall surface of the turntable.

3. The rotation construction method of a continuous beam bridge based on a novel ball joint according to claim 1 is characterized in that: In step S6, a plurality of rotating drums are provided and arranged in a ring shape around the center of the bottom of the bridge.

4. The rotation construction method of a continuous beam bridge based on a novel ball joint according to claim 1 is characterized in that: In step S6, two tensioning platforms are provided, and the two tensioning platforms are symmetrically arranged around the center of the bottom of the bridge.

5. The rotation construction method of a continuous beam bridge based on a novel ball joint according to claim 4 is characterized in that: Two traction cables are provided, one end of which is fixedly mounted on the anchoring leg, and the other end is mounted on a tensioning platform away from the anchoring leg. The traction cables surround half of the rotating drum on the main pier.

6. The rotation construction method of a continuous beam bridge based on a novel ball joint according to claim 4 is characterized in that: The number of the anchoring legs is two and they are symmetrically arranged, and the projection angle between the position of one of the anchoring legs and the adjacent tensioning platform is ≤45°.

7. The rotation construction method of a continuous beam bridge based on a novel ball joint according to claim 1 is characterized in that: The inverted support leg comprises two support columns and a support plate arranged on the top surface of the support column, and the gap between the top surface of the support plate and the slideway at the bottom of the beam is 1-2 cm.

8. The rotation construction method of a continuous beam bridge based on a novel ball joint according to claim 1 is characterized in that: The shape of the rotating sphere is spherical, and four fifths of the volume of the rotating sphere is located in the accommodating groove.

9. The rotation construction method of a continuous beam bridge based on a novel ball joint according to claim 8 is characterized in that: The swivel ball joint also includes a positioning device, the center axis of the positioning device coincides with the center axis of the upper ball joint, and a positioning shaft is provided at the center axis of the lower ball joint, and the positioning shaft is rotatably connected to the positioning device at the center axis of the positioning device.

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