CN112554055B - Rapid construction method for cable-stayed bridge cable tower structural system - Google Patents
Rapid construction method for cable-stayed bridge cable tower structural system Download PDFInfo
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- CN112554055B CN112554055B CN202011074616.5A CN202011074616A CN112554055B CN 112554055 B CN112554055 B CN 112554055B CN 202011074616 A CN202011074616 A CN 202011074616A CN 112554055 B CN112554055 B CN 112554055B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a quick construction method for a cable-stayed bridge cable tower structure system, and relates to the technical field of bridge construction. The quick construction method of the cable-stayed bridge cable tower structure system comprises the following steps: step 1, constructing a tower column base section; step 2, assembling tower column sections and steel cross beams among the tower column sections; step 3, installing stay cables on the steel cross beams outside the tower columns; step 4, constructing corresponding main beam sections based on the installed stay cables; and (5) repeating the steps 2-4 until the tower column capping and the main beam are completely constructed. In the embodiment of the invention, the transverse connection between the tower column sections is established between each section of the tower column section through the steel cross beam, the structural stability of the cable-stayed bridge tower is improved, the tower column side of the stay cable can be anchored on the steel cross beam, the structural stability requirement in the tower column construction process is reduced, the construction of the stay cable and the corresponding main beam section can be started in the tower column construction process, the simultaneous construction of the tower column, the stay cable and the main beam is realized, the construction time is greatly shortened, and the working efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a quick construction method of a cable-stayed bridge cable tower structure system.
Background
With the rapid development of road traffic, the demand for large-span and larger-span bridges is increasing, and cable-stayed bridges are regarded as an important bridge type of the large-span bridges, and the cable-tower anchoring areas of important stressed structures of the cable-stayed bridges are also concerned. The cable tower anchoring area is a structure which uniformly transmits the local concentrated force of the stay cable to the lower part of the cable tower.
The common cable-stayed bridge cable tower forms comprise a single-column type, a double-column type, an A type, an inverted Y type, a door type, a vase type, a diamond type, a pagoda type and the like, and 1-2 cross beams are not arranged or arranged on an upper tower column section. The existing stay cable tower end anchoring modes include the following modes: the anchoring areas are all inside the tower column in the modes of prestressed beam anchoring, cross anchoring and steel anchor box anchoring, and because the tower end is anchored inside the tower column, the cable tower is usually constructed firstly, and after the cable tower of the cable-stayed bridge is constructed and capped, the cable tower is a stable structure, and then the installation of the stay cable and the construction of the corresponding main beam section are started, namely the cable tower and the main beam are constructed separately.
Under different cable tower structures, anchor mode, the construction process difference mainly concentrates on last pylon cable tower anchor district section, and from last pylon construction beginning, cable-stay bridge main part construction process is as shown in figure 1, and main part construction process mainly includes: step a, lifting a climbing frame, and splicing a tower column stiff framework; step b, binding steel bars and installing a stay cable sleeve; c, positioning the sleeve; d, mounting the prestressed pipeline and the steel bundle; step e, installing the template in place; f, pouring and curing concrete; step g, applying prestress and grouting (if the steel anchor beam and the steel anchor box are in the form of steel anchor beams and steel anchor boxes, mounting steel cross beams and steel boxes); step h, repeating the steps to carry out next section construction until the cable tower is capped; and i, mounting the stay cable and constructing the corresponding main beam.
Therefore, the stay cable in the prior art is mainly anchored in the cable tower column, the upper tower column section tower column is weak in transverse connection and poor in structural stability, construction of the stay cable and the main beam can be performed only after the cable tower construction is completed, the construction time is long, and the efficiency is low; and if the prestressed anchoring mode is adopted, the positioning accuracy of the stay cable is greatly influenced.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for quickly constructing a cable-stayed bridge cable-tower structure system, so as to solve the problems of weak transverse connection, poor structural stability, long construction time, low efficiency, etc. of upper tower column sections of cable-stayed bridges in the prior art.
In some illustrative embodiments, the method for rapidly constructing a cable-stayed bridge cable tower structure system is applied to a double-column cable tower structure system, and comprises the following steps: step 1, constructing a tower column base section; step 2, assembling tower column sections and steel cross beams among the tower column sections; step 3, installing stay cables on the steel cross beams outside the tower columns; step 4, constructing corresponding main beam sections based on the installed stay cables; and 5, repeating the steps 2-4 until the capping of the tower column and the construction of the main beam are completed.
In some optional embodiments, the assembling the tower sections and the steel beams between the tower sections in the step 2 specifically includes: step 21, splicing the tower column stiff frameworks of the tower column sections; step 22, hoisting the steel cross beam between the tower column stiff frameworks; step 23, assembling and pouring a template on the tower column stiff skeleton to form a concrete forming cavity of the tower column section; and 24, pouring and maintaining concrete in the concrete forming cavity.
In some optional embodiments, before hoisting the steel beam between the tower column stiff frameworks, the method further comprises: and a bracket for bearing the steel beam is arranged between the tower column stiff frameworks.
In some optional embodiments, after the construction of step 2 is completed, the assembly of the next tower section and the steel beam between the tower sections is started synchronously.
In some optional embodiments, the steel beam is processed at a factory, or the steel beam and the stay cable anchoring components thereon are integrally processed at the factory.
In some optional embodiments, after the installation of at least 2 steel beams is completed, the stay cables are installed on the steel beams outside the tower column.
In some optional embodiments, at least one pair of stay cables is installed on each steel beam.
In some optional embodiments, the steel beams are spaced apart in the vertical direction.
The invention also aims to provide a cable-stayed bridge cable tower structure system to solve the problems that the upper tower column section of a cable-stayed bridge in the prior art is weak in transverse connection, poor in structural stability and the like.
In some illustrative embodiments, the cable-stayed bridge, applied to a double-column type cable tower structure system, comprises: a tower column; the steel cross beam is arranged between the tower columns; the main beam is arranged below the steel cross beam and extends along the horizontal linear direction; constructing a stay cable in a mechanical relationship between the tower column and the main beam; and one end of the stay cable positioned at the side of the tower column is fixed on the corresponding steel cross beam.
In some optional embodiments, the tower comprises: the tower column comprises a tower column base section and at least 2 tower column sections assembled on the tower column base section in sequence; at least 1 steel beam is arranged between each tower column segment; the main beam is divided into main beam sections corresponding to the number of the steel cross beams; and each steel cross beam is connected with the corresponding main beam section through at least one pair of stay cables.
Compared with the prior art, the invention has the following advantages:
in the embodiment of the invention, the transverse connection between the tower column sections is established between each section of the tower column base section of the cable-stayed bridge through the steel cross beam, so that the structural stability of the cable-stayed bridge tower is improved, and the tower column side of the stay cable can be anchored on the steel cross beam with stable structure through the design, so that the structural stability requirement in the tower column construction process is reduced, the complete top sealing of the tower column is not needed, the construction of the stay cable and the corresponding main beam section can be started in the tower column construction process, the synchronous construction of the tower column, the stay cable and the main beam can be realized, the construction time is greatly shortened, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of cable-stayed bridge construction in the prior art;
FIG. 2 is a flow chart of a method for rapidly constructing a cable-stayed bridge pylon structural system according to an embodiment of the invention;
FIG. 3 is an elevation view of a cable-stayed bridge pylon structural system according to an embodiment of the invention;
FIG. 4 is a side view of a tower in an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along plane 1-1 of a tower in an embodiment of the present invention;
FIG. 6 is a schematic view of a cable-stayed bridge pylon structural system according to an embodiment of the present invention;
FIG. 7 is a flow chart of the assembly of a tower section and a steel beam in an embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
Description of terms:
anchoring outside the tower: the stay cable tower end is anchored and positioned at the outer side of the non-tower column body;
a steel beam: the cable-stayed bridge tower is a steel structure beam which is transversely arranged between two tower limbs of the upper tower column section of the cable-stayed bridge tower;
stay cable anchor assembly: a rigid structure for fixing the stay cable is arranged at the side of the tower;
the cable-stayed bridge in the embodiment of the invention aims at a double-column cable tower structure system, so that the tower column base section and each tower column segment in the embodiment of the invention are in a bilateral symmetry structure, namely the tower column base section comprises a left tower column base section and a right tower column base section, and each tower column segment also comprises a left tower column segment and a right tower column segment which are assembled by upward splicing the left tower column base section and the right tower column base section.
It should be noted that the technical features in the embodiments of the present invention may be combined with each other without conflict.
The embodiment of the invention discloses a method for quickly constructing a cable-stayed bridge cable tower structure system, and particularly, as shown in fig. 2-6, fig. 2 is a flow chart of the method for quickly constructing the cable-stayed bridge cable tower structure system in the embodiment of the invention; FIG. 3 is an elevation view of a cable-stayed bridge pylon structural system according to an embodiment of the invention; FIG. 4 is a side view of a tower in an embodiment of the present invention; FIG. 5 is a cross-sectional view of a face 1-1 of a tower in an embodiment of the present invention; fig. 6 is a schematic diagram of bridge construction of a cable-stayed bridge pylon structural system according to the rapid construction method in the embodiment of the invention. The quick construction method of the cable-stayed bridge cable tower structure system is applied to a double-column cable tower structure system (not limited to a vase type and an inverted Y type), and comprises the following steps:
step S1, constructing a tower column base section;
the tower column base section in the embodiment of the invention is a structure serving as a cable tower bearing foundation, and at least one tower column section 13n can be constructed on the tower column base section; the lower column 11 or structure below the lower column 11 may be considered to comprise a pylon in some embodiments; in other embodiments, the lower column 11 and the middle column 12, or the structure below the middle column 12, which may be considered to include a pylon; in other embodiments, the structure can be considered as a structure below the maximum traffic limit height of the cable-stayed bridge; or the bridge is divided into the lower parts of the upper part and the lower part according to the design requirement.
Step S2, assembling the tower column sections 13n and the steel beams 20 between the tower column sections 13 n;
the tower column segment in the embodiment of the invention is a stressed structure used as a cable tower stay cable anchor and used for anchoring a main beam stay cable; a structure that may be considered to include a mid-tower and an upper tower of a pylon in some embodiments; in other embodiments may be considered to include the structure of the upper column of the pylon; in some embodiments, the structure can also be considered as a structure of the cable-stayed bridge above the maximum traffic limit; or the bridge is divided into the upper part and the lower part according to the design requirement. Taking fig. 4 as an example, the pylon segment 13a … … 13n belongs to the upper pylon 13.
The tower column sections are vertical longitudinal structures, the steel cross beams are horizontal transverse structures, the steel cross beams are erected between the tower column sections on the left side and the right side, and the mechanical connection of the tower column sections on the left side and the right side is enhanced through the steel cross beams, so that the overall structural strength and the stability of the tower column sections (including the steel cross beams) are improved.
Step S3, mounting stay cables 30 on the steel cross beam 20 outside the tower column 10;
the steel beam 20 is provided with a stay cable anchor assembly 50 inside, which is used for mounting and fixing the stay cable on the tower side. Preferably, the stay cable anchoring assembly is in the form of an anchoring plate, is reliably welded with the plate inside the steel beam, and can be integrally manufactured with the steel beam. The number of the stay cables anchored by each steel beam is determined according to the stress and deformation of the structure. And the beam end anchoring of the stay cable can be realized by selecting a common anchoring form according to the actual engineering condition.
Step S4, constructing the corresponding girder section 40 based on the stay cable 30 after installation;
and S5, repeating the steps S2-S4 until the tower column capping and the main beam are completely constructed.
In the embodiment of the invention, the transverse connection between the tower column sections is established between each section of the tower column base section of the cable-stayed bridge through the steel cross beam, so that the structural stability of the cable-stayed bridge tower is improved, and the tower column side of the stay cable can be anchored on the steel cross beam with stable structure through the design, so that the structural stability requirement in the tower column construction process is reduced, the complete top sealing of the tower column is not needed, the construction of the stay cable and the corresponding main beam section can be started in the tower column construction process, the synchronous construction of the tower column, the stay cable and the main beam can be realized, the construction time is greatly shortened, and the working efficiency is improved.
In addition, the stay cable tower end is anchored and moved to the outer side of the tower column, the cross section of the tower column is simplified, repeated mounting and dismounting of an inner side template are avoided, and standardized construction is facilitated.
In some optional embodiments, after the construction in step S2 is completed, the assembly of the next tower segment and the steel beam between the tower segments is started synchronously, i.e., step S5 is performed. When the construction of the step S2 in the steps S2-S4 for the tower column segment, the steel beam, the stay cable and the main beam segment is finished, the construction of the step S2 in the steps S2-S4 for the next tower column segment, the steel beam, the stay cable and the main beam segment can be started, so that the construction of other segments of the tower column can be continued while the construction of the main beam and the stay cable bridge is carried out, the construction period is obviously shortened, and the efficiency is improved.
In some embodiments, the tower column segments in the embodiments of the present invention refer to segments of the upper tower column that are equally spaced between the left and right tower columns, and therefore, the steel beams and the mounting and fixing structures thereof between each tower column segment are the same, which is beneficial to uniform overall stress of the tower column, repeated processing of standard components, and reduction of time and construction cost.
As shown in fig. 7, in the embodiment of the present invention, specifically, the assembling of the tower sections and the steel beams between the tower sections in step S2 specifically includes:
step S21, splicing the tower column stiff skeleton of the tower column segment;
specifically, the tower column stiff skeleton is of a steel bar structure and serves as a skeleton base body of the tower column segments, and the bracket for bearing the steel beam is mounted on the skeleton base body and is arranged on the inner sides of the left and right tower column segments.
Step S22, hoisting the steel beam between the tower column stiff frameworks;
in the step, the steel beam can be hung on the corbels on the inner sides of the left tower column section and the right tower column section, and binding and fixing are carried out; in some other embodiments, the tower column and the steel cross beam can be reliably connected through one or more of prestressed tendons, high-strength anchor rods, shear keys, shear nails and binding modes.
Step S23, assembling and pouring a template on the tower column stiff skeleton to form a concrete molding cavity of the tower column segment;
the concrete molding cavity is not limited to a square cavity structure or a square cavity structure.
And S24, pouring and curing the concrete in the concrete forming cavity.
In some optional embodiments, after the step S22 is completed, the steel beam between the tower column segments has stronger structural strength, so that the subsequent steps S3 and S4 can be performed, and the concrete pouring and the stay cable installation and anchoring of the tower column segments are simultaneously performed, thereby further reducing the construction period.
Preferably, the embodiment of the invention provides an installation method suitable for a large-tonnage steel beam, which comprises the following steps: a steel cross beam installation method of a large tower crane, a profile steel bracket, a three-way jack positioning system and a profile steel and steel wire rope soft and hard combined overturn prevention system is provided.
Firstly, embedding a bracket embedded part of a steel beam mounting bracket during concrete pouring of an upper tower column section; then installing a steel beam installation bracket, reasonably selecting a large-tonnage tower crane according to site construction conditions, and hoisting the steel beam upper tower according to the sequence of the first side section, the second middle section and the last side section; positioning by using a three-way positioning jack; splicing plates among the steel beam sections are screwed with the high bolts; and installing a steel cross beam high-strength anchor rod, pouring tower column concrete twice to connect the steel cross beam and the tower column into a whole, and finally tensioning the high-strength anchor rod to enable the tower column and the steel cross beam to be stressed cooperatively.
Wherein, the method implements a three-step control method of the installation precision of the steel beam, including prepressing, rough adjusting and fine adjusting:
And 2, when the steel beam section is hung on the steel beam bracket buttress for about 5cm in height, the steel beam section is assisted to be in place by constructors.
3, accurately positioning the steel beam sections in two steps from local to integral, accurately adjusting the space coordinates of the side sections by using a three-way jack after the first side section is hoisted in place, locking the side sections, sequentially hoisting the rest sections and locking the side sections for assembly, and installing temporary punching nails and temporary bolts for locking the sections; after the steel cross beam is integrally assembled, the three-way jack is integrally used for accurately positioning; through two-step accurate positioning, the installation accuracy of the steel beam is controlled within 2 mm. In the process of positioning by adopting the three-way jack, the screw jack is locally added for auxiliary positioning, so that the positioning speed of the steel beam section can be accelerated.
In some embodiments, the steel beam in the embodiments of the present invention may be fabricated on site, or may be fabricated in a factory. The steel cross beam in the embodiment of the invention is not required to be arranged in the tower column, so that the construction of the tower column section is relatively independent, and the influence of on-site manufacture on the construction of the tower column section can be reduced by prefabricating outside the field. Furthermore, the steel cross beam and the stay cable anchoring assembly on the steel cross beam are integrally processed and prefabricated in a factory.
In some embodiments, at least one pair of stay cable anchoring assemblies are mounted on the steel cross beams and used for anchoring at least one pair of stay cables.
In some embodiments, the steel beams are arranged at certain intervals in the vertical direction, namely, the steel beams are arranged at equal intervals, so that the uniformity of the overall stress of all tower column sections is improved, and the safety factor of a bridge system is improved.
Preferably, in the embodiment of the invention, after at least 2 steel cross beams are installed, the stay cables are installed on the steel cross beams outside the tower column. After the installation of the steel beam between the first tower column segment and the first tower column segment is completed, the installation of the steel beam between the second tower column segment and the second tower column segment is carried out, and then the construction of the stay cable and the corresponding main beam segment is carried out on the basis of the steel beam between the first tower column segment and the second tower column segment in sequence. In the embodiment, the installation of at least two steel cross beams is firstly completed, so that a more stable mechanical structure is established, and the anchoring of the stay cable and the construction of the main beam section are safer and more stable.
Specifically, the method for quickly constructing a cable-stayed bridge cable tower structure system in the embodiment of the invention is applied to a double-column cable tower structure system, and comprises the following steps:
step 101, analyzing a target bridge to be constructed, dividing a cable tower of the target bridge into a tower column base section and a plurality of tower column sections, and dividing a main beam of the target bridge into a plurality of main beam sections; establishing a one-to-one corresponding relation between each tower column section and the main beam section according to the construction sequence;
102, constructing a tower column base section;
103, assembling a first tower column section and a steel cross beam between the first tower column sections on the tower column base section;
103, assembling a second tower column section and a steel cross beam between the second tower column sections on the first tower column section;
step 104, sequentially installing at least one pair of stay cables on the steel cross beams between the first tower column sections and the second tower column sections respectively;
105, constructing corresponding main beam sections based on stay cables arranged between the first tower column sections and between the second tower column sections;
after step S103 is completed, the two-section synchronous construction of the tower column cross beam and the cable main beam section can be started, the construction of the next tower column section and the steel cross beam between the tower column sections can be started after the construction of the previous tower column section and the steel cross beam between the tower column sections is completed, and the installation of the corresponding stay cable and the construction of the main beam section can be started after the construction of the steel cross beam between the tower column section and the tower column sections is completed until the capping of the tower column and the construction of the main beam are completed.
The embodiment of the invention also discloses a cable-stayed bridge cable tower structure system, which can be constructed by the cable-stayed bridge cable tower structure system rapid construction method, in particular, the cable-stayed bridge cable tower structure system is applied to a double-column cable tower structure system and comprises the following steps: a tower column; the steel cross beam is arranged between the tower columns; the main beam is arranged below the steel cross beam and extends along the horizontal linear direction; constructing a stay cable in a mechanical relationship between the tower column and the main beam; and one end of the stay cable positioned at the side of the tower column is fixed on the corresponding steel cross beam.
In some optional embodiments, the tower comprises: the tower column comprises a tower column base section and at least 2 tower column sections assembled on the tower column base section in sequence; at least 1 steel beam is arranged between each tower column segment; the main beam is divided into main beam sections corresponding to the number of the steel cross beams; and each steel cross beam is connected with the corresponding main beam section through at least one pair of stay cables.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (5)
1. A cable-stayed bridge cable tower structure system rapid construction method is characterized by being applied to a double-column cable tower structure system and comprising the following steps:
step 1, constructing a tower column base section;
step 2, assembling tower column sections and steel cross beams among the tower column sections;
step 3, installing at least one pair of stay cables on the steel cross beam outside the tower column;
step 4, constructing corresponding main beam sections based on the installed stay cables;
step 5, repeating the steps 2-4 until the capping of the tower column and the construction of the main beam are completed;
after the installation of at least 2 steel cross beams is completed, stay cables are installed on the steel cross beams outside the tower column;
the step 2 comprises the following steps:
step 21, splicing the tower column stiff frameworks of the tower column sections;
step 22, hoisting the steel cross beam between the tower column stiff frameworks;
step 23, assembling and pouring a template on the tower column stiff skeleton to form a concrete forming cavity of the tower column section;
24, pouring and maintaining concrete in the concrete forming cavity;
after the construction in the step 22 is completed, the step 3 is started to be implemented; after the construction in the step 24 is finished, synchronously starting the assembly of the next tower column section and the steel cross beam between the tower column sections;
hoisting the steel beam between the tower column stiff frameworks in the step 22, and specifically comprises the following steps: and hoisting the steel beam upper tower according to the sequence of the first edge section, the second middle section and the last edge section.
2. The method for rapidly constructing a cable-stayed bridge cable tower structure system according to claim 1, wherein before the steel beam is hoisted between the tower column stiff skeletons, the method further comprises the following steps: and a bracket for bearing the steel beam is arranged between the tower column stiff frameworks.
3. The method for rapidly constructing a cable-stayed bridge cable tower structure system according to claim 1, wherein the steel cross beam is processed and manufactured in a factory, or the steel cross beam and the stay cable anchoring components thereon are integrally processed and manufactured in a factory.
4. A method for constructing a cable-stayed bridge cable tower structure system according to claim 1, wherein at least one pair of stay cables is installed on each of the steel cross members.
5. The method for rapidly constructing a cable-stayed bridge cable tower structural system according to claim 1, wherein the steel cross beams are spaced apart from each other at a constant interval in the vertical direction.
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