Structural system and construction method of inclined tower cable-stayed S-shaped bridge deck pedestrian bridge

Abstract

The present invention discloses a structural system for a cable-stayed, S-shaped pedestrian bridge with an inclined tower and a construction method thereof. The system comprises a foundation, a main tower, and a main body. The main body comprises an S-shaped steel box girder. The foundation comprises abutments and pile foundations, embedded main tower components, and a cap. The main tower components and cap are provided with a main tower pile foundation at the bottom. The main tower comprises a main tower, embedded anchor components, and an anchor platform. The anchor pile foundation is provided at the bottom of the embedded anchor components and the anchor platform. Back cables are provided between the embedded anchor components and the anchor platform and the top of the adjacent main tower. Front cables are provided between the side of the main tower facing away from the back cables and the S-shaped steel box girder. The present invention effectively solves the overall technical difficulties of this type of bridge deck, which is complex and suffers complex forces. Furthermore, the construction method is economical, practical, resource-saving, and affordable for this type of bridge installation.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a structural system of an inclined-tower, cable-stayed S-shaped bridge deck pedestrian bridge and a construction method thereof. Background Art

[0002] In the era of rapid development of construction engineering, bridges not only have to bear the main function of transportation, but their landscape role is also playing an increasingly important role. In order to make the bridge beautiful in shape and graceful in lines, the bridge shape is becoming more and more diversified, and the structural stress is becoming more and more complex. A tower structure system is adopted, but the inclined tower form is rarely used. During construction, the inclined tower needs to generate excessive internal stress and accurate positioning during construction. In addition, it is necessary to solve the working strength and stability of the bridge deck when the system is formed. Finally, the most reasonable way is used during tensioning to ensure that the stress of the bridge cable meets the requirements. Summary of the Invention

[0003] In order to solve the shortcomings of the existing technology, the present invention provides a tilted tower cable-stayed S-shaped bridge deck pedestrian bridge structure system and its construction method, which effectively solves the overall technical difficulties of complex bridge deck and complex force of this type of bridge. At the same time, the construction method is economical and practical for the installation of this type of bridge, saves resources, and is economical and affordable.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] According to the present invention, a structural system of an inclined tower and cable-stayed S-shaped bridge deck pedestrian bridge comprises, from bottom to top, a foundation part, a main tower part and a main body part;

[0006] The main body includes: an S-shaped steel box beam;

[0007] The foundation part includes: abutments and pile foundations supported at both ends of the S-shaped steel box girder, main tower embedded parts and caps located at two concave parts of the S-shaped steel box girder, and main tower pile foundations are provided at the bottom of the main tower embedded parts and caps;

[0008] The main tower portion includes: a main tower with its bottom fixed to the main tower embedded part and the pedestal and its top inclined toward the S-shaped steel box girder, an anchor embedded part and an anchor platform located at the abutment and the pile foundation and respectively located on the same side of the S-shaped steel box girder as the adjacent main tower, an anchor pile foundation provided at the bottom of the anchor embedded part and the anchor platform, a back cable provided between the anchor embedded part and the anchor platform and the top of the adjacent main tower, and a front cable provided between the side of the main tower facing away from the back cable and the S-shaped steel box girder;

[0009] It also includes a lattice column for positioning the main tower. The lattice column is temporarily fixed on the S-shaped steel box girder at a position corresponding to the downward projection of the top of the main tower before the main tower is hoisted.

[0010] A column top tooling is provided on the top of the disc-locked lattice column, and the column top tooling includes a horizontal transverse distribution beam welded and fixed to the top of the disc-locked lattice column and arc-shaped steel plates welded and fixed on the horizontal transverse distribution beam and corresponding to both sides of the main tower upper segment.

[0011] Furthermore, there are multiple front cables, which are symmetrically arranged on both sides of the S-shaped steel box girder in groups of two, and several groups of front cables are evenly spaced along the length direction of the S-shaped steel box girder.

[0012] Furthermore, counterweights are provided at both ends of the S-shaped steel box girder.

[0013] Furthermore, the S-shaped steel box girder is hoisted in sections.

[0014] A construction method for the above-mentioned inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system comprises the following steps:

[0015] The construction of the main tower pile foundation, main tower embedded parts and bearing platform, anchor pile foundation, anchor embedded parts and anchor platform, bridge abutment and pile foundation has been completed;

[0016] Construct S-shaped steel box girders and complete the S-shaped bridge deck;

[0017] Constructing a lattice column on the S-shaped steel box girder, wherein the lattice column is temporarily fixed on the S-shaped steel box girder at a position corresponding to the downward projection of the top of the main tower;

[0018] The main tower is hoisted as a whole on site, the bottom of the main tower is connected and fixed with the main embedded parts and the base, and the top of the main tower is positioned on the top of the lattice column;

[0019] Install the front stays and back stays, and remove the temporarily fixed disc-and-hook lattice columns.

[0020] The construction method according to claim 1 is characterized in that it also includes: using finite element analysis software Midas Civil to establish a calculation model for main tower installation, S-shaped steel box girder installation, front cable and back cable tensioning, and analyzing the model stability and structural stress performance.

[0021] Furthermore, the main tower pile foundation and the anchor pile foundation adopt steel pipe piles. During the construction of the steel pipe piles, the spacing between the steel pipe piles is determined by calculating the cut-off force and facilitating the processing of the cut-off length.

[0022] Furthermore, before constructing the S-shaped steel box girder, multiple temporary support systems are set up at intervals corresponding to the length direction of the S-shaped steel box girder. The temporary support system includes a double H-shaped steel crossing the bottom of the S-shaped steel box girder and steel pipe piles supported at both ends of the bottom of the double H-shaped steel. Temporary supports are set on the double H-shaped steel. The temporary supports and the bottom of the S-shaped steel box girder are padded with steel plate pads when there is a gap.

[0023] The positive progress effect of the present invention is:

[0024] The inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structural system and construction method of the present invention effectively solve the overall technical problems of complex bridge deck and complex force of this type of bridge. At the same time, the construction method is economical and practical for the installation of this type of bridge, saves resources, and is economical and affordable. In addition, the support measures, simulation methods and tensioning sequence adopted in the construction method are reasonable and appropriate, and the construction process is easy to control. Therefore, it can be widely used in structural systems of the same type. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a rendering of the structural architecture of a tilted-tower, cable-stayed S-shaped bridge deck pedestrian bridge proposed by the present invention.

[0027] Figure 2 This is a schematic structural diagram of the elevation view of the structural system of a tilted tower, cable-stayed S-shaped bridge deck pedestrian bridge proposed by the present invention.

[0028] Figure 3 This is a schematic structural diagram of the plan view of the structural system of a tilted tower cable-stayed S-shaped bridge deck pedestrian bridge proposed by the present invention.

[0029] Figures 4-6 Schematic diagram of steel pipe pile support method.

[0030] Figure 7 This is a schematic diagram of the erection of the interlocking lattice column.

[0031] Figure 8 Schematic diagram of the top details of the interlocking lattice column.

[0032] Figure 9 and Figure 10 This is a schematic diagram of the support method of the lattice column, where: Figure 9 The main tower is shown. Figure 10 The main tower is not shown.

[0033] The corresponding relationship between the names of the numbers in the accompanying drawings is as follows:

[0034] 1-steel box girder, 2-main tower, 3-front cable, 4-back cable, 5-anchor embedded parts and anchor platform, 6-main tower embedded parts and pedestal, 7-main tower pile foundation, 8-anchor pile foundation, 9-abutment and pile foundation, 10-disc-lattice column, 11-guy rope, 12-horizontal transverse distribution beam, 13-shaped arc-shaped steel plate, 14-contact surface rubber pad, 15-main tower upper segment, 16-steel pipe pile, 17-head plate, 18-double H-shaped steel, 19-triangular stiffening plate, 20-temporary support. DETAILED DESCRIPTION

[0035] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0036] See also Figures 1 to 6 A double steel tube inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system includes a steel box girder 1, a main tower 2, a front cable 3, a back cable 4, anchor embedded parts and anchor platform 5, main tower embedded parts and pedestal 6, main tower pile foundation 7, anchor pile foundation 8, abutment and pile foundation 9.

[0037] This structural system is a double steel tube inclined tower cable-stayed bridge. The main body of the bridge adopts a steel box girder 1, which consists of the foundation part, the main tower part and the main body part from bottom to top. Among them:

[0038] The main part includes: S-shaped steel box girder 1;

[0039] The foundation part includes: abutments and pile foundations 9 supported at both ends of the S-shaped steel box girder 1, main tower embedded parts and caps 6 located at two inner S-shaped concave parts of the S-shaped steel box girder 1, and main tower pile foundations 7 at the bottom of the main tower embedded parts and caps 6;

[0040] The main tower part includes: a main tower 2 whose bottom is fixed to the main tower embedded parts and the pedestal 6 and whose top is inclined toward the S-shaped steel box girder 1, anchor embedded parts and anchor platforms 5 located at the abutments and pile foundations 9 and are located on the same side of the S-shaped steel box girder 1 as the adjacent main tower 2, an anchor pile foundation 8 is provided at the bottom of the anchor embedded parts and the anchor platform 5, a back cable 4 is provided between the anchor embedded parts and the anchor platform 5 and the top of the adjacent main tower 2, and a front cable 3 is provided between the side of the main tower 2 facing away from the back cable 4 and the S-shaped steel box girder 1.

[0041] Furthermore, there are multiple front cables 3 , which are symmetrically arranged on both sides of the S-shaped steel box girder 1 in groups of two, and several groups of front cables 3 are evenly spaced along the length direction of the S-shaped steel box girder 1 .

[0042] Furthermore, counterweights are installed at both ends of the S-shaped steel box girder 1 to make the bridge more stable. The S-shaped steel box girder 1 was hoisted in sections.

[0043] Furthermore, with Figures 7-10 As shown, the inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system also includes a disc-shaped lattice column 10 for positioning the main tower 2. Before the main tower 2 is hoisted, the disc-shaped lattice column 10 is temporarily fixed on the S-shaped steel box girder 1 at a position corresponding to the downward projection of the top of the main tower 2.

[0044] In order to better adjust the installation elevation of the components, a column top tooling is set at the top of the buckle lattice column 10. The column top tooling mainly includes a horizontal transverse distribution beam 12 (I-beam can be used) welded and fixed on the top of the buckle lattice column 10, and a customized curved steel plate 13 welded and fixed on the horizontal transverse distribution beam 12 and corresponding to both sides of the main tower upper segment 15. The material of the customized curved steel plate 13 can be Q345 steel. All parts are welded and fixed. After the column top tooling is installed and positioned, it is welded and fixed to the lattice column base. The fillet welds should meet the relevant provisions of the specifications and meet the requirements of the third-level welds. Preferably, the customized curved steel plates 13 on both sides are padded with rubber on the contact surface with the main tower upper segment 15 to protect the tower wall.

[0045] Preferably, main tower 2 utilizes double steel pipes. After the steel pipes are installed, concrete is poured into the pipes to form the main tower. Before installation, finite element analysis software Midas Civil performs simulation calculations to determine the offset and stress conditions of main tower 2 after installation. Main tower 2 is hoisted integrally during installation. Prior to placement of the interlocking lattice columns 10, the planar position and elevation of the mounting points are precisely measured and laid out onto the interlocking lattice columns 10. Position and elevation control is then performed using a tooling platform at the top of the columns. During installation, the process is verified against the simulation calculations.

[0046] The present invention also provides a construction method for the above-mentioned inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system, which mainly includes the following steps:

[0047] Step 1: Reference Figure 1 , complete the construction of the bridge substructure, mainly including the construction of the main tower pile foundation 7, main tower embedded parts and pedestal 6, anchor pile foundation 8, anchor embedded parts and anchor platform 5, abutment and pile foundation 9; during construction, pay special attention to the accuracy of the position of the main tower and anchor embedded parts.

[0048] Step 2: Read Figures 4-6 , complete the construction of the temporary support system in the water, and set up multiple temporary support systems at intervals corresponding to the length direction of the S-shaped steel box girder. The temporary support system includes a double H-shaped steel 18 that passes across the bottom of the S-shaped steel box girder and steel pipe piles 16 supported at both ends of the bottom of the double H-shaped steel 18. The steel sheet piles 16 of the temporary support system in the water need to be located 1m outside the main beam of the bridge deck to facilitate later removal. Four rows of support systems are set up in the water. The underwater support system needs to calculate and determine the depth of the steel pipe piles, the size of the main beam, the setting of the diagonal braces, etc. according to the stress conditions.

[0049] In order to stabilize the installation process of the main beam of the bridge deck and control the elevation, two temporary supports 20 are set in the temporary support system. The installation of the steel box girder strictly controls the bridge deck as the main part. The temporary supports 20 and the main beam and steel box girder of the support system are fixed by welding. When there is a gap between the temporary support 20 and the bottom of the steel box girder, steel plate pads are used to fill it to ensure flatness.

[0050] The third step: construct S-shaped steel box girder to complete the S-shaped bridge deck. The entire bridge deck is a flexible structural system. Steel pipe piles are used to complete the support system construction. The spacing of steel pipe piles is determined by calculating the cut-off force and the cut-off length for easy processing. The construction of steel pipe piles must take into account the convenience of later extraction in order to save costs.

[0051] Among them, the steel box girder is divided into sections according to the length of the S-shaped steel box girder, and a crane is used to complete the lifting and installation of the steel box girder sections.

[0052] Step 4: construct the disc-shaped lattice column 10 on the S-shaped steel box girder 1, and temporarily fix the disc-shaped lattice column 10 on the S-shaped steel box girder 1 at a position corresponding to the downward projection of the top of the main tower 2.

[0053] Specifically, the construction of the lattice column includes: it is erected using 60-type lattice, adopting a 3-layer barrel-type structural system (diagonal bars are set at each step of each layer of the structural system), the first layer is erected into 900mm×900mm, the second layer is erected into 2700mm×2700mm, and it is erected at a step distance of 1500mm. Tie rods are set between layers, and ordinary steel pipes are used for tensioning when there are no standard rods. A 200mm×200mm steel plate is set at the bottom of the lattice column as a pad, and the steel pipes, pads and steel box girders are all welded.

[0054] Step 5: Cable wind rope construction, set φ19.5 cable wind rope 11 anchor at the four corners of the buckled lattice column 10, the upper part is set at the 2 / 3 position of the lattice column, and the lower part uses a basket fastener to fix the hanging point position. The basket fastener matches the cable wind rope 11. After the installation is completed, tighten the basket fastener. Figure 9 and Figure 10 shown.

[0055] Further reading Figure 8 In order to better adjust the installation elevation of the components, a column top tooling is set above the platform of the disc-shaped lattice column 10. It mainly consists of customized curved steel plates 13 on both sides and horizontal transverse distribution beams 12. All parts are welded and fixed. After the column top tooling is installed and positioned, it is welded and fixed to the lattice column base. The fillet welds should meet the relevant provisions of the specifications and reach the requirements of the third-level welds.

[0056] Further reading Figure 9 and Figure 10Before the main tower was installed, finite element analysis software Midas Civil was used for simulation calculations to determine the offset and stress conditions after installation. During the main tower installation, the main tower was hoisted as a whole. Before arranging the lattice columns, the plane positions and elevations of the mounting points were precisely measured and laid out. Position and elevation were then controlled using a tooling platform. During installation, the process was verified against the simulation calculations.

[0057] Step 6: hoist the main tower 2 as a whole on site, connect and fix the bottom of the main tower 2 with the main embedded parts and the base 6, and position the top of the main tower 2 on the top of the lattice column 10.

[0058] Step 7: Install the front cables 3 and back cables 4, and remove the temporarily fixed temporary support system and the lattice columns 10.

[0059] After the tower is completed, the tower bridge deck position is measured, the cable length is determined, the cable installation is completed, the cables are tensioned, and the temporary underwater support system is removed after the system conversion is completed.

[0060] After the main tower structure was installed, the bridge's 16 cables were tensioned symmetrically and synchronously using four sets of equipment. Finite element analysis software Midas Civil simulated the tensioning sequence and employed a step-by-step approach. Each cable was tensioned in four stages: preload, 30%, 60%, 90%, and 105%. Tension values at each point were verified every 1-2 minutes. Cable tension control was the primary focus, with elevation control serving as a supplement.

[0061] During the entire construction process, the finite element analysis software Midas Civil was used to establish calculation models for the installation of the inclined tower, panel installation, and cable tensioning, analyze its stability and structural stress performance, and adopt construction monitoring measures to ensure the overall safety of the construction.

[0062] The present invention provides a double steel tube inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structural system and construction method, comprising the use of towers, anchors, S-shaped bridge deck, cable-stayed structure, counterweight measures and other structural forms, the towers adopt a double steel tube inclined tower + post-anchoring form, after the steel tube towers are installed, concrete is poured, and the anchoring adopts a pile + concrete anchoring structure; the S-shaped bridge deck, in order to achieve a beautiful line effect, has a relatively light overall design, adopts inclined towers and cable-stayed structure to ensure the overall stress stability of the bridge deck, and finally, counterweights are given to the two ends of the bridge head to make the bridge more stable as a whole.

[0063] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and the changes still fall within the scope of protection of the present invention.

Claims

1. A structural system of an inclined tower and cable-stayed S-shaped deck pedestrian bridge, characterized in that: From bottom to top, it includes the foundation part, the main tower part and the main body part; The main body includes: an S-shaped steel box beam; The foundation part includes: abutments and pile foundations supported at both ends of the S-shaped steel box girder, main tower embedded parts and caps located at two concave parts of the S-shaped steel box girder, and main tower pile foundations are provided at the bottom of the main tower embedded parts and caps; The main tower portion includes: a main tower with its bottom fixed to the main tower embedded part and the pedestal and its top inclined toward the S-shaped steel box girder, an anchor embedded part and an anchor platform located at the abutment and the pile foundation and respectively located on the same side of the S-shaped steel box girder as the adjacent main tower, an anchor pile foundation provided at the bottom of the anchor embedded part and the anchor platform, a back cable provided between the anchor embedded part and the anchor platform and the top of the adjacent main tower, and a front cable provided between the side of the main tower facing away from the back cable and the S-shaped steel box girder; It also includes a lattice column for positioning the main tower. The lattice column is temporarily fixed on the S-shaped steel box girder at a position corresponding to the downward projection of the top of the main tower before the main tower is hoisted. A column top tooling is provided on the top of the disc-locked lattice column, and the column top tooling includes a horizontal transverse distribution beam welded and fixed to the top of the disc-locked lattice column and arc-shaped steel plates welded and fixed on the horizontal transverse distribution beam and corresponding to both sides of the main tower upper segment.

2. The inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system according to claim 1 is characterized in that: There are multiple front cables, which are symmetrically arranged on both sides of the S-shaped steel box girder in groups of two, and several groups of front cables are evenly spaced along the length direction of the S-shaped steel box girder.

3. The inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system according to claim 1 is characterized in that: Counterweights are also provided at both ends of the S-shaped steel box beam.

4. The inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system according to claim 1 is characterized in that: The S-shaped steel box girder is hoisted in sections.

5. A construction method for the inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system according to any one of claims 1 to 4, characterized in that: Including steps: The construction of the main tower pile foundation, main tower embedded parts and bearing platform, anchor pile foundation, anchor embedded parts and anchor platform, bridge abutment and pile foundation has been completed; Construct S-shaped steel box girders and complete the S-shaped bridge deck; Constructing a lattice column on the S-shaped steel box girder, wherein the lattice column is temporarily fixed on the S-shaped steel box girder at a position corresponding to the downward projection of the top of the main tower; The main tower is hoisted as a whole on site, the bottom of the main tower is connected and fixed with the main embedded parts and the base, and the top of the main tower is positioned on the top of the lattice column; Install the front stays and back stays, and remove the temporarily fixed disc-and-hook lattice columns.

6. The construction method according to claim 5, characterized in that: It also includes: using the finite element analysis software Midas Civil to establish calculation models for main tower installation, S-shaped steel box girder installation, front cable and back cable tensioning, and analyzing the model stability and structural stress performance.

7. The construction method according to claim 5, characterized in that: The main tower pile foundation and anchor pile foundation adopt steel pipe piles. During the construction of the steel pipe piles, the spacing between the steel pipe piles is determined by calculating the cut-off force and facilitating the processing of the cut-off length.

8. The construction method according to claim 5, characterized in that: Before constructing the S-shaped steel box girder, multiple temporary support systems are set up at intervals along the length direction of the S-shaped steel box girder. The temporary support system includes a double H-shaped steel crossing the bottom of the S-shaped steel box girder and steel pipe piles supported at both ends of the bottom of the double H-shaped steel. Temporary supports are set on the double H-shaped steel. Steel plate pads are used to fill gaps between the temporary supports and the bottom of the S-shaped steel box girder.

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