CN115341449A - Leaning tower cable-stayed S-shaped bridge surface pedestrian bridge structure system and construction method thereof - Google Patents

Abstract

The invention discloses an inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system and a construction method thereof, wherein the system comprises a foundation part, a main tower part and a main body part; the main body part includes: s-shaped steel box girders; the base portion includes: the main tower embedded part and the bottom of the bearing platform are provided with a main tower pile foundation; the main tower section includes: the anchor pile foundation is arranged at the bottom of the anchor embedded part and the anchor platform, a back cable is arranged between the anchor embedded part and the anchor platform and the top of the main tower close to the anchor platform, and a front cable is arranged between one side of the main tower back to the back cable and the S-shaped steel box girder. The invention effectively solves the overall technical problems of complex bridge deck and complex stress, and the construction method is economical and practical, saves resources and is economical and practical for the bridge installation.

Description

Leaning tower cable-stayed S-shaped bridge surface pedestrian bridge structure system and construction method thereof

Technical Field

The invention relates to the technical field of building construction, in particular to an inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system and a construction method thereof.

Background

In the era of rapid development of building engineering, bridges not only have main functions of traffic but also play more and more important roles in landscape, in order to make the bridges attractive in appearance and beautiful in lines and make the bridge shapes more and more diversified, the structural stress is more and more complex, a tower type structure system is adopted, but an inclined tower form is used less, when in construction, overlarge internal stress is generated in the inclined tower construction process and the positioning is accurate, in addition, the working condition strength and stability of the bridge deck when the system is formed need to be solved, and finally, the most reasonable mode is adopted to ensure that the stress of bridge cables meets the requirements during tensioning.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a leaning tower cable-stayed S-shaped bridge surface pedestrian bridge structure system and a construction method thereof, which effectively solve the overall technical problems of complex bridge surface and complex stress of the type of bridge, and meanwhile, the construction method is economical and practical in installation, saves resources and is economical and practical for the bridge.

The purpose of the invention is realized by the following technical scheme:

the leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structure system comprises a base part, a main tower part and a main body part from bottom to top respectively;

the main body portion includes: s-shaped steel box girders;

the base portion includes: the main tower comprises an abutment and pile foundations supported at two ends of the S-shaped steel box girder, and main tower embedded parts and a bearing platform positioned at two concave parts of the S-shaped steel box girder, wherein the main tower pile foundations are arranged at the bottoms of the main tower embedded parts and the bearing platform;

the main tower section includes: the bottom is fixed in the king-tower buries piece and cushion cap and top to the king-tower of S shaped steel box girder orientation slope, be located abutment and pile foundation department just are located with the king-tower that closes on respectively the anchoring of S shaped steel box girder homonymy buries piece and anchor platform, the anchoring is buried the piece and the anchor platform bottom is equipped with the anchoring pile foundation, the anchoring is buried and is equipped with the back of the body cable between piece and the anchor platform and the king-tower top that closes on, the king-tower is back of the body to one side of back of the body cable with be equipped with the fore-guy cable between the S shaped steel box girder.

Furthermore, the quantity of front guy cable is the multichannel, and two liang are drawn for a set of symmetry and establish the both sides of S shaped steel box girder, and a plurality of groups the front guy cable is followed the equidistant distribution of length direction of S shaped steel box girder.

Furthermore, counterweights are further arranged at two ends of the S-shaped steel box girder.

And further, completing sectional hoisting of the S-shaped steel box girder.

And furthermore, the device also comprises a disc buckling lattice column for positioning the main tower, wherein the disc buckling lattice column is temporarily fixed on the S-shaped steel box girder at a position corresponding to the downward orthographic projection of the top end of the main tower before the main tower is hoisted.

Further, the top of dish knot lattice column sets up the capital frock, the capital frock includes welded fastening the horizontal distribution roof beam and the welded fastening of dish knot lattice column top are in on the horizontal distribution roof beam and correspond the arc steel sheet of main tower upper segment both sides.

A construction method of the leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structural system comprises the following steps:

constructing to finish the main tower pile foundation, the main tower embedded parts and bearing platforms, the anchoring pile foundation, the anchoring embedded parts and anchor platforms, the bridge abutment and the pile foundation;

constructing an S-shaped steel box girder to finish an S-shaped bridge deck;

constructing a disc buckling lattice column on the S-shaped steel box girder, wherein the disc buckling lattice column is temporarily fixed at a position corresponding to the downward orthographic projection of the top end of the main tower on the S-shaped steel box girder;

integrally hoisting a main tower on site, wherein the bottom of the main tower is fixedly connected with a main body embedded part and a bearing platform, and the top of the main tower is positioned at the top of the disc buckling lattice column;

and installing a front inhaul cable and a back cable, and dismantling the temporarily fixed disc buckle lattice column.

The construction method according to claim 1, further comprising: and (3) establishing a main tower installation model, an S-shaped steel box girder installation model and a front cable and back cable tensioning calculation model by adopting finite element analysis software Midas Civil, and analyzing the stability and the structural stress performance of the models.

Furthermore, the main tower pile foundation and the anchoring pile foundation are steel pipe piles, and in the process of constructing the steel pipe piles, the distance between the steel pipe piles is determined by calculating the truncation stress and facilitating the processing of the truncation length.

Further, before S shaped steel case roof beam is under construction, still including the length direction who corresponds S shaped steel case roof beam, the interval sets up many places temporary support system, temporary support system including crossing the double pin H shaped steel of S shaped steel case roof beam below and support in the steel-pipe pile at double pin H shaped steel bottom both ends, be provided with temporary support on the double pin H shaped steel, the temporary support carries out the chock with the steel sheet cushion when S shaped steel case beam bottom of the beam adoption has the space.

The positive progress effects of the invention are as follows:

the invention relates to a leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structure system and a construction method thereof, which effectively solve the overall technical problems of complex bridge deck and complex stress, and meanwhile, the construction method is economical and practical in installation, resource-saving and economical and practical aiming at the bridge, and the leaning frame measures, the simulation method and the tensioning sequence adopted in the construction method are reasonable and appropriate, and the construction process is easy to control, so that the leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structure system can be widely applied to the same type of structure systems.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a structural effect diagram of a pedestrian bridge structure system with an inclined tower cable-stayed S-shaped bridge deck according to the invention.

Fig. 2 is a schematic structural view of an elevation of a leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structural system provided by the invention.

Fig. 3 is a schematic structural plan view of a pedestrian bridge structure system with an inclined tower cable-stayed S-shaped bridge deck according to the present invention.

Fig. 4 to 6 are schematic diagrams illustrating a supporting method of the steel pipe pile.

Fig. 7 is a schematic view of the erection of the disc buckle lattice column.

Fig. 8 is a detailed view of the top of the coiled lattice column.

Fig. 9 and 10 are schematic views of the support practice of the disc-buckled lattice column, wherein fig. 9 shows the main tower and fig. 10 does not show the main tower.

The numerical designations in the drawings correspond to the following names:

1-steel box girder, 2-main tower, 3-front guy cable, 4-back cable, 5-anchoring embedded part and anchor platform, 6-main tower embedded part and bearing platform, 7-main tower pile foundation, 8-anchoring pile foundation, 9-bridge platform and pile foundation, 10-disc buckling lattice column, 11-cable wind rope, 12-horizontal transverse distribution beam, 13-shaped arc steel plate, 14-contact surface rubber pad, 15-main tower upper segment, 16-steel pipe pile, 17-end sealing plate, 18-double-splicing H-shaped steel, 19-triangular stiffening plate and 20-temporary support.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, and is not intended to limit the present invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1 to 6, a pedestrian bridge structure system with double-steel-pipe leaning tower and cable-stayed S-shaped bridge deck comprises a steel box girder 1, a main tower 2, a front guy cable 3, a back cable 4, an anchoring embedded part and anchor platform 5, a main tower embedded part and bearing platform 6, a main tower pile foundation 7, an anchoring pile foundation 8, and a bridge platform and pile foundation 9.

According to the double-steel-pipe leaning tower cable-stayed bridge of the structural system, a bridge main body adopts a steel box girder 1 and is respectively a foundation part, a main tower part and a main body part from bottom to top; wherein:

the main body part includes: s-shaped steel box girder 1;

the base portion includes: the main tower comprises an abutment and pile foundation 9 supported at two ends of an S-shaped steel box girder 1, main tower embedded parts and a bearing platform 6 positioned in S-shaped concave parts at two positions of the S-shaped steel box girder 1, wherein a main tower pile foundation 7 is arranged at the bottom of each main tower embedded part and the corresponding bearing platform 6;

the main tower section includes: the bottom is fixed in main tower and buries piece and cushion cap 6 and top to the main tower 2 of 1 direction slope of S shaped steel case roof beam, be located abutment and pile foundation 9 department and be located anchoring with the main tower 2 that closes on respectively and bury piece and anchor platform 5 of 1 homonymy of S shaped steel case roof beam, anchoring buries piece and anchor platform 5 bottom and is equipped with anchoring pile foundation 8, anchoring buries and is equipped with back of the body cable 4 between 5 and the main tower 2 tops that close on of piece and anchor platform, be equipped with fore-guy cable 3 between the one side of main tower 2 back to back of the body cable 4 and S shaped steel case roof beam 1.

Furthermore, the number of the front inhaul cables 3 is multiple, every two front inhaul cables are symmetrically arranged on two sides of the S-shaped steel box girder 1 in a group, and the front inhaul cables 3 in the groups are distributed at equal intervals along the length direction of the S-shaped steel box girder 1.

Furthermore, the two ends of the S-shaped steel box girder 1 are also provided with counterweights, so that the whole bridge is more stable. And completing sectional hoisting of the S-shaped steel box girder 1.

Further, as shown in fig. 7 to 10, the people bridge structure system with the inclined tower cable-stayed S-shaped bridge deck further comprises a disc buckling lattice column 10 for positioning the main tower 2, wherein the disc buckling lattice column 10 is temporarily fixed on the S-shaped steel box girder 1 at a position corresponding to the downward orthographic projection of the top end of the main tower 2 before the main tower 2 is hoisted.

For better adjusting the component installation elevation, the top of the disc buckling lattice column 10 is provided with a column top tool, the column top tool mainly comprises a horizontal transverse distribution beam 12 (which can adopt an I-shaped steel beam) fixed at the top of the disc buckling lattice column 10 in a welding manner and customized arc-shaped steel plates 13 fixed on the horizontal transverse distribution beam 12 in a welding manner and corresponding to two sides of an upper section 15 of a main tower, the customized arc-shaped steel plates 13 can be made of Q345 steel, all parts are welded and fixed, the column top tool is welded and fixed with a lattice column base after being installed and positioned, and fillet welds meet relevant regulations of specifications, so that the requirements of three-level welds are met. Preferably, the customized arc-shaped steel plates 13 on both sides are padded with rubber at the contact surface with the upper section 15 of the main tower to protect the tower wall.

Preferably, the main tower 2 is made of double steel pipes, and concrete is poured into the steel pipes after the steel pipes are installed, so that the main tower is formed. Before the main tower 2 is installed, finite element analysis software Midas Civil simulation calculation is carried out to determine the deflection and stress conditions of the main tower 2 after installation. Adopt main tower 2 integral hoisting mode during the installation of main tower 2, set buckle lattice column 10 and put in the plane position and the elevation point of shelving the point through accurate measurement lofting earlier before arranging to set buckle lattice column 10, and the rethread capital frock platform carries out position and elevation control, carries out the process with analog computation in the installation and rechecks.

The invention also provides a construction method of the leaning tower cable-stayed S-shaped bridge surface pedestrian bridge structure system, which mainly comprises the following steps:

the first step is as follows: referring to fig. 1, the construction of the bridge substructure is completed, which mainly comprises a main tower pile foundation 7, a main tower embedded part and bearing platform 6, an anchoring pile foundation 8, an anchoring embedded part and anchor platform 5, and a bridge abutment and pile foundation 9; during construction, the position accuracy of the main tower and the anchoring embedded part is particularly noticed.

The second step is that: referring to fig. 4-6, accomplish the interim support system construction of aquatic, correspond the length direction of S shaped steel case roof beam, the interval sets up the interim support system in many places, interim support system is including crossing the double-pin H shaped steel 18 of S shaped steel case roof beam below and supporting in the steel-pipe pile 16 at the 18 bottom both ends of double-pin H shaped steel, the interim support system steel sheet pile 16 of aquatic need be located the outer 1m of bridge floor girder, the later stage of being convenient for is extracted, the aquatic sets up 4 rows of support systems, the aquatic support system need be according to the atress condition calculation confirm the steel-pipe pile depth of driving into, the girder size, the bracing sets up etc.

For stable and the elevation control of bridge floor girder installation, set up two temporary support 20 at interim support system, steel box girder installation strict control bridge floor is main, and temporary support 20 all adopts welded fastening with support system girder, steel box girder, and the steel sheet cushion blocks are filled up and are ensured to level when adopting to have the space at the bottom of temporary support 20 and steel box girder.

The third step: s shaped steel case roof beam is under construction, accomplishes S type bridge floor, and the bridge floor is whole to be the flexible construction system, adopts the steel-pipe pile to accomplish the support system construction, cuts the atress through the calculation and is convenient for process and cuts length and confirm the steel-pipe pile interval, and the steel-pipe pile construction must compromise the later stage and extract the convenience to practice thrift the cost.

And the steel box girder is segmented according to the length of the S-shaped steel box girder, and the steel box girder is hoisted and installed in a segmented mode by adopting a crane.

The fourth step: and constructing a coiling and buckling lattice column 10 on the S-shaped steel box girder 1, and temporarily fixing the coiling and buckling lattice column 10 on the S-shaped steel box girder 1 at a position corresponding to the downward orthographic projection of the top end of the main tower 2.

Specifically, the construction of the disc buckling lattice column comprises the following steps: adopt 60 type dish to detain to set up and form, adopt 3 layers of barrel type structural system (every step of structural system all sets up the down tube), 900mm x 900mm is set up into to the first layer, 2700mm x 2700mm is set up into to the second layer, set up according to 1500mm step, set up the pull rod between the layer, no standard member adopts ordinary steel pipe to draw and connects, dish detains lattice column bottom and sets up 200mm x 200mm steel sheet as the cushion, steel pipe, cushion, steel box girder all adopt the welding.

The fifth step: and (3) cable wind rope construction, namely arranging phi 19.5 cable wind ropes 11 at four corners of a coiled and buckled lattice column 10 for anchoring, arranging the upper parts of the cable wind ropes at 2/3 positions of the lattice column, fixing hanging point positions at the lower parts of the cable wind ropes by using basket fasteners, matching the basket fasteners with the cable wind ropes 11, and screwing the basket fasteners after installation is finished, as shown in fig. 9 and 10.

Further referring to fig. 8, in order to better adjust the installation elevation of the component, a column top tool is arranged above the platform of the disc buckling lattice column 10, the column top tool mainly comprises an arc-shaped steel plate 13 with two customized sides and a horizontal transverse distribution beam 12, all parts are welded and fixed, the column top tool is welded and fixed with a lattice column base after being installed and positioned, and a fillet weld shall meet relevant regulations of the specification and meet the requirements of a three-level weld.

With further reference to fig. 9 and 10, before the main tower is installed, finite element analysis software Midas Civil simulation calculations are performed to determine the deflection and stress conditions after the main tower is installed. The main tower installation, main tower integral hoisting mode, lattice column arrange earlier through accurate measurement lofting will shelve the plane position and the high point of elevation put in to lattice column before, and the rethread frock platform carries out position and elevation control, carries out the process with analog computation in the installation and rechecks.

And a sixth step: the main tower 2 is integrally hoisted on site, the bottom of the main tower 2 is fixedly connected with the main body embedded part and the bearing platform 6, and the top of the main tower 2 is positioned at the top of the disc buckle lattice column 10.

The seventh step: installing a front guy cable 3 and a back guy cable 4, and removing a temporary support system and a disc buckle lattice column 10 which are temporarily fixed.

And after the tower is completed, measuring the bridge surface position of the tower, determining the length of the stay cable, completing the installation of the stay cable, tensioning the stay cable, and dismantling the temporary support system in the water after completing the system conversion.

Specifically, after the installation of the tower body is completed, 16 inhaul cables are counted in a full bridge mode, 4 sets of equipment are symmetrically and synchronously tensioned, the tensioning is simulated and calculated through finite element analysis software Midas Civil, the tensioning is simulated sequentially, the tensioning is gradually carried out, and each inhaul cable is tensioned and divided into four stages: pre-tightening- >30% - >60% - >90% - >105%, and verifying the tension value of each point at an interval of 1-2 min. The cable force control is primary, and the elevation control is secondary.

In the whole construction process, finite element analysis software Midas Civil is adopted to establish a leaning tower installation, panel installation and cable tension calculation model, the stability and the structural stress performance of the leaning tower installation, the construction monitoring measures are adopted, and the safety of the whole construction is ensured.

The invention provides a double-steel-pipe leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structure system and a construction method, which comprises the following steps of adopting the structural forms of a tower, anchoring, an S-shaped bridge deck, a cable-stayed structure, a counterweight measure and the like, wherein the tower adopts the form of double-steel-pipe leaning tower plus rear anchoring, the steel pipe tower is poured and coagulated after being installed, and the anchoring adopts a pile plus concrete anchoring structure; the S-shaped bridge deck is light in overall design for achieving the line graceful effect, inclined towers are adopted for inclined pulling, the whole stress stability of the bridge deck is guaranteed, and at last, the balance weights are given to the two end parts of the bridge head of the bridge, so that the whole bridge is more stable.

The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and these embodiments are still within the scope of the invention.

Claims (10)

1. An inclined tower cable-stayed S-shaped bridge deck pedestrian bridge structure system is characterized by comprising a base part, a main tower part and a main body part from bottom to top respectively;

the main body portion includes: s-shaped steel box girders;

the base portion includes: the main tower comprises an abutment and pile foundations supported at two ends of the S-shaped steel box girder, and main tower embedded parts and a bearing platform positioned at two concave parts of the S-shaped steel box girder, wherein the main tower pile foundations are arranged at the bottoms of the main tower embedded parts and the bearing platform;

the main tower section includes: the bottom is fixed in the king-tower buries piece and cushion cap and top to the king-tower of S shaped steel box girder orientation slope, be located abutment and pile foundation department just are located with the king-tower that closes on respectively the anchoring of S shaped steel box girder homonymy buries piece and anchor platform, the anchoring is buried the piece and the anchor platform bottom is equipped with the anchoring pile foundation, the anchoring is buried and is equipped with the back of the body cable between piece and the anchor platform and the king-tower top that closes on, the king-tower is back of the body to one side of back of the body cable with be equipped with the fore-guy cable between the S shaped steel box girder.

2. The leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structure system according to claim 1, wherein the number of the front cables is multiple, every two front cables form a group and are symmetrically arranged on two sides of the S-shaped steel box girder, and the groups of the front cables are distributed at equal intervals along the length direction of the S-shaped steel box girder.

3. The leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structural system according to claim 1, wherein counterweights are further arranged at two ends of the S-shaped steel box girder.

4. The leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structural system according to claim 1, wherein the S-shaped steel box girder is hoisted in sections.

5. The leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structure system according to claim 1, further comprising a disc buckling lattice column for positioning the main tower, wherein the disc buckling lattice column is temporarily fixed on the S-shaped steel box girder at a position corresponding to the downward orthographic projection of the top end of the main tower before the main tower is hoisted.

6. The leaning tower cable-stayed S-shaped bridge deck pedestrian bridge structure system according to claim 5, wherein a column top tool is arranged at the top of the disc buckling lattice column, and the column top tool comprises a horizontal transverse distribution beam welded and fixed at the top of the disc buckling lattice column and arc-shaped steel plates welded and fixed on the horizontal transverse distribution beam and corresponding to two sides of an upper section of a main tower.

7. A construction method of the leaning tower cable-stayed S-shaped bridge surface pedestrian bridge structure system according to any one of claims 1 to 6, which is characterized by comprising the following steps:

constructing to finish the main tower pile foundation, the main tower embedded parts and bearing platforms, the anchoring pile foundation, the anchoring embedded parts and anchor platforms, the bridge abutment and the pile foundation;

constructing an S-shaped steel box girder to finish an S-shaped bridge deck;

constructing a disc buckling lattice column on the S-shaped steel box girder, wherein the disc buckling lattice column is temporarily fixed at a position corresponding to downward orthographic projection of the top end of the main tower on the S-shaped steel box girder;

integrally hoisting a main tower on site, wherein the bottom of the main tower is fixedly connected with a main body embedded part and a bearing platform, and the top of the main tower is positioned at the top of the disc buckling lattice column;

and installing a front pull cable and a back cable, and removing the temporarily fixed disc buckle lattice column.

8. The construction method according to claim 1, further comprising: and (3) establishing a main tower installation model, an S-shaped steel box girder installation model and a front cable and back cable tensioning calculation model by adopting finite element analysis software Midas Civil, and analyzing the stability and the structural stress performance of the models.

9. The construction method according to claim 1, wherein the main tower pile foundation and the anchoring pile foundation are steel pipe piles, and the steel pipe pile spacing is determined by calculating the truncation stress and facilitating the processing of the truncation length in the process of constructing the steel pipe piles.

10. The construction method according to claim 1, wherein before the S-shaped steel box girder is constructed, a plurality of temporary supporting systems are arranged at intervals corresponding to the length direction of the S-shaped steel box girder, each temporary supporting system comprises double-spliced H-shaped steel crossing below the S-shaped steel box girder and steel pipe piles supported at two ends of the bottom of the double-spliced H-shaped steel, temporary supports are arranged on the double-spliced H-shaped steel, and the temporary supports and the bottom of the S-shaped steel box girder are plugged by steel plate pads when gaps exist.

Images