CN116516793A - Construction method of asymmetric cantilever beam of cable-stayed bridge - Google Patents
Construction method of asymmetric cantilever beam of cable-stayed bridge Download PDFInfo
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- CN116516793A CN116516793A CN202310615905.9A CN202310615905A CN116516793A CN 116516793 A CN116516793 A CN 116516793A CN 202310615905 A CN202310615905 A CN 202310615905A CN 116516793 A CN116516793 A CN 116516793A
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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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
- E01D21/10—Cantilevered erection
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Abstract
The invention relates to a construction method of an asymmetric cantilever beam of a cable-stayed bridge, which comprises the following steps: constructing a midspan 0# block and a side span 0# block on the tower column; a bracket based on a tower column is respectively provided with a midspan 1# block and a side span 1# block; a bridge deck crane is arranged on the midspan 1# block, and a guy rope hanging basket is arranged on the side span 1# block; assembling the middle span by using the bridge deck crane until the middle span is folded, and realizing balance weight by using a balance weight type pulling and pressing auxiliary pier at the side of the side span; and assembling the side span by using the guy rope hanging basket until the side span is folded, and realizing balance weight by using an unbalanced weight module at the side of the middle span. After the installation of the 1# blocks of the side span and the middle span is completed, a guy rope hanging basket is installed on the side of the side span, and a bridge deck crane is installed on the side of the middle span, so that each block of the side span main beam and the middle span main beam can be simultaneously constructed and stay ropes can be simultaneously installed, the stress of the stay ropes on the corresponding blocks is ensured to be the same, and the stability and the line type of the bridge are ensured in the construction process of the cable-stayed bridge and after the construction process of the cable-stayed bridge.
Description
The application is a divisional application of patent application 'construction method and system of asymmetric cantilever beam of cable-stayed bridge', the application date of the original application is 2020-12-31, the application number is 2020116322424, and the publication number is CN 112695607A.
Technical Field
The invention relates to the technical field of bridges, in particular to a construction method of an asymmetric cantilever beam of a cable-stayed bridge.
Background
At present, the conventional concrete girder construction mode generally carries out concrete pouring by erecting a high support of a floor steel pipe, and adopts a bridge deck crane to hoist the steel girder. However, the construction of the floor steel pipe bracket consumes extremely materials and construction time, however, the risk factors are more and the potential risks are large during the construction, dismantling, pre-pressing loading, concrete cast-in-situ and beam storage of the steel pipe high bracket; the steel pipe high support has large wind-receiving area, wide occupied water area range and risk of 'ship collision', if the steel pipe high support is in typhoons and multiple places, the steel pipe high support can be influenced by uncertain factors such as typhoons, and the safety risk is high during construction; the cast-in-situ bracket of the steel pipe consumes materials and construction period, and the working load of high-altitude welding is also larger. In addition, in the simultaneous construction process of the double-cantilever bridge, the side span adopts a concrete pouring girder, the middle span adopts a steel girder, so that the girders on two sides of the tower column are unbalanced in stress, the construction difficulty is high, and the line type and the quality of the bridge after construction cannot be ensured.
Disclosure of Invention
In order to solve the technical problems, in particular to the problems that in the simultaneous construction process of a double-cantilever bridge, a side span adopts a concrete pouring girder, a middle span adopts a steel girder, so that the girders on two sides of a tower column are unbalanced in stress, the construction difficulty is high, and the line type and the quality of the bridge after construction are not guaranteed, the following technical scheme is specifically provided:
the construction method of the asymmetric cantilever beam of the cable-stayed bridge provided by the embodiment of the application comprises the following steps:
respectively erecting a midspan 1# block and a side span 1# block;
a bridge deck crane is arranged on the midspan 1# block, and a guy rope hanging basket is arranged on the side span 1# block;
the auxiliary pier closest to the cable tower is configured as a counterweight type pulling and pressing auxiliary pier;
and when the side span main beam is prolonged to the counterweight type pulling and pressing auxiliary pier, fixedly connecting the side span main beam with the counterweight type pulling and pressing auxiliary pier.
Optionally, the erecting the midspan 1# block and the side span 1# block respectively includes:
installing a side span 0# block and a middle span 0# block on the top of a tower column, and temporarily solidifying the side span 0# block and the middle span 0# block with the tower column respectively;
installing a side span 1# block connected with the side span 0# block on the side span side of the tower column, and simultaneously installing a middle span 1# block connected with the middle span 0# block on the middle span side of the tower column.
Optionally, after the bridge deck crane is installed on the midspan 1# block, the method comprises the following steps:
and installing a midspan No. 2 block through the bridge deck crane, and simultaneously installing an unbalanced weight module on the midspan side.
Optionally, after the bridge deck crane is installed on the midspan 1# block, the method comprises the following steps:
and installing the midspan section through the bridge deck crane until the midspan section is folded.
Optionally, the bridge deck crane comprises any one of a portal bridge deck crane and a mast type full-rotation crane.
Optionally, the guy wire basket comprises: the long-platform guy rope hanging basket, the short-platform composite guy rope hanging basket and the stock rod piece assembly guy rope hanging basket are any one of the steel-grade welding guy rope hanging baskets.
Optionally, the side span main beam extends to the front of the counterweight type pulling and pressing auxiliary pier, and comprises:
installing a concrete bearing platform on the pile foundation, and installing a pile load weight module on the bearing platform;
and mounting the pier body on the pile-load ballast anchor block.
Optionally, the side span main beam extends to the counterweight type tension and compression auxiliary pier, and the counterweight type tension and compression auxiliary pier comprises:
advancing the guy rope hanging basket along the construction advancing direction of the side span;
and hoisting the steel capping beam on the pier body to form the counterweight type pull-press auxiliary pier, wherein the pier body is connected with the steel capping beam in an anchoring manner.
The embodiment of the application provides a construction system of asymmetric cantilever beam of cable-stayed bridge, include:
the bridge deck crane is arranged on the midspan main beam and is used for hoisting the midspan section;
the guy rope hanging basket is arranged on the side span main beam and is used for installing the side span main beam steel structure and carrying out concrete pouring on the side span main beam steel structure;
the counterweight type pulling and pressing auxiliary pier is arranged on the side of the side span main beam and used for supporting the side span main beam; or to balance the tension experienced by the side span main beams.
Optionally, the guy rope hanging basket is installed on the side span 1# block after the side span 1# block is constructed, and the bridge deck crane is installed on the midspan 1# block after the midspan 1# block is constructed.
Optionally, the tower further comprises a bracket, wherein the bracket is mounted on the side of the side span of the tower column and used for pouring the side span 1# block.
Optionally, the device further comprises a floating crane for hoisting the midspan No. 1 block and an unbalanced weight module arranged on the midspan main beam.
Optionally, the counterweight type pulling and pressing auxiliary pier comprises: pile foundation, set up in the cushion cap on the pile foundation, set up in pile load weight module on the cushion cap, set up in pier shaft on the pile load weight module, and anchor in steel bent cap on the pier shaft, pile load weight module with the size of cushion cap is unanimous.
Optionally, an anchoring device for anchoring the girder of the bridge is arranged on the steel capping beam.
Optionally, the pier body adopts 4 first steel pipe stands to constitute, the pier body with still be provided with the second steel pipe stand between the steel bent cap, and the second steel pipe stand with first steel pipe stand is connected.
Optionally, the anchor connecting device in the cushion cap, be provided with on the pile ballast module the through-hole that first steel pipe stand passed, first steel pipe stand pass the through-hole with connecting device's one end is connected, connecting device's the other end with steel pile casing in the pile foundation is connected.
Compared with the prior art, the invention has the following beneficial effects:
according to the construction method of the asymmetric cantilever beam of the cable-stayed bridge, which is provided by the embodiment of the application, the midspan 1# block and the side span 1# block are respectively erected; a bridge deck crane is arranged on the midspan 1# block, and a guy rope hanging basket is arranged on the side span 1# block; the auxiliary pier closest to the cable tower is configured as a counterweight type pulling and pressing auxiliary pier; and when the side span main beam is prolonged to the counterweight type pulling and pressing auxiliary pier, fixedly connecting the side span main beam with the counterweight type pulling and pressing auxiliary pier. After the installation of the 1# blocks of the side span and the middle span is completed, a guy cable hanging basket is installed on the side of the side span, and a bridge deck crane is installed on the side of the middle span, so that each block of the side span main beam and the middle span main beam can be constructed simultaneously, the construction efficiency is improved, and simultaneously, stay cables of the cable-stayed bridge can be installed on corresponding blocks of the side span main beam and the middle span main beam simultaneously, so that the stress of the stay cables on the corresponding blocks is the same, and the stability and the line type of the bridge in the construction process and after the construction of the cable-stayed bridge are ensured. Meanwhile, the counterweight type pulling and pressing auxiliary pier ensures that the corresponding side span and middle span joint blocks can be smoothly constructed.
The construction system of the asymmetric cantilever beam of the cable-stayed bridge is characterized in that a bridge deck crane is arranged on the midspan main beam and used for hoisting midspan sections; the guy rope hanging basket is arranged on the side span main beam and is used for installing the side span main beam steel structure and carrying out concrete pouring on the side span main beam concrete structure; the counterweight type pulling and pressing auxiliary pier is arranged on the side of the side span main beam and used for supporting the side span main beam; or the tension counterweight type tension-compression auxiliary pier used for balancing the side span main beam ensures the stress balance in the construction process of the asymmetric double cantilever beam of the cable-stayed bridge, thereby ensuring the stability in the construction process of the asymmetric double cantilever, ensuring the smooth proceeding of bridge construction and ensuring the construction efficiency.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic flow chart of a construction method of an asymmetric cantilever beam of a cable-stayed bridge;
FIG. 2 is a schematic diagram of a construction system for asymmetric cantilever beams of a cable-stayed bridge according to the present invention;
fig. 3 is a schematic structural view of a counterweight type tension-compression auxiliary pier in the construction system of the asymmetric cantilever beam of the cable-stayed bridge.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, but do not preclude the presence or addition of one or more other features, integers, steps, operations.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The construction method for the asymmetric cantilever beam of the cable-stayed bridge provided by the embodiment of the application, as shown in fig. 1, comprises the following steps: s110, S120, S130, S140.
S110: and respectively erecting a midspan 1# block and a side span 1# block.
Optionally, erecting a midspan 1# block and a side span 1# block respectively, including:
installing an edge span 0# block and a middle span 0# block on the top of the tower column, and temporarily solidifying the edge span 0# block and the middle span 0# block with the tower column respectively.
Installing a side span 1# block connected with the side span 0# block on the side span side of the tower column, and simultaneously installing a middle span 1# block connected with the middle span 0# block on the middle span side of the tower column.
In an embodiment provided herein, a construction system for asymmetric cantilever beams of a cable-stayed bridge, as shown in fig. 2, includes: bridge deck crane 13 is mounted on the midspan main beam for lifting and mounting the steel structural midspan main beam sections in place. 14 guy wire hanging basket, install on the side span girder, be convenient for install the side span girder concrete structure on the basis of guy wire hanging basket 14 to the side span girder steel structure is concreted on the basis of guy wire hanging basket 4, so as to form side span girder section. The counterweight type pulling and pressing auxiliary piers 15 are arranged on the side of the side span main beam and are used for supporting the side span main beam; or the bridge is used for balancing the tension born by the side span main beam, so that the bridge construction is smoothly carried out and the novel bridge can be ensured. The unbalanced weight module is arranged on the main beam of the middle span, when the stress on the side of the side span is large or moment is large, the unbalanced weight module arranged on the middle span can increase the gravity and moment of the middle span, and further balance the unbalanced stress of the side span cantilevers and the middle span cantilevers on two sides of the tower column 12, the tower column 12 is a cable-stayed bridge cable tower lower tower pier structure, serves as a fulcrum and a connection point for construction of the side span and the middle span cantilevers, and constructs the side span main beam and the middle span main beam to two sides along the bridge respectively. As shown in fig. 2, the side span comprises an auxiliary pier 16 and a side span transition pier 17, so as to improve the stability of the side span main beam in the side span side construction process.
In the construction process of the cable-stayed bridge, firstly, a side span 0# block and a middle span 0# block are required to be constructed on a tower column, so that the construction of other sections of the side span main beam and the middle span main beam is convenient to carry out on the basis. In order to ensure that the stability and the bridge line type of the side span main beam and the side span main beam can be kept in the construction process of other sections of the side span main beam and the middle span main beam, after the construction of the side span 0# block and the middle span 0# block is finished, the side span main beam and the side span main beam are respectively and temporarily solidified with a tower column. In the construction process of the 0# block, the steel structure of the side span 0# block is firstly installed, and then the midspan 0# block is hoisted to the top of the tower column for installation. The 0# block of the midspan is a steel-concrete combined section, the steel-concrete combined section adopts a pre-pouring method, after concrete is solidified, the steel-concrete combined section is hoisted to the top of a tower column through a floating crane for installation, the steel-concrete combined section is connected with the 0# block steel structure of the frame, and then the 0# block steel structure of the frame is subjected to concrete pouring.
After the installation of the side span 0# block and the middle span 0# block is completed on the top of the tower column, installing brackets on the side span side of the tower column along the bridge direction, pouring concrete to the steel structure of the side span 1# block through the brackets after the installation of the steel structure of the side span 1# block is completed, and obtaining the side span 1# block after the concrete strength is qualified. Meanwhile, the floating crane is used for hoisting the midspan 1# block and the midspan 0# block, the side span main beam section and the midspan main beam section are constructed simultaneously, and the construction efficiency of the whole bridge is improved. It should be noted that, in the embodiment provided in the application, before the hoisting of the midspan girder Liang Duanzai, the pre-assembled midspan girder segment needs to be hoisted in place for installation, so that the construction efficiency of the midspan segment is improved.
In order to ensure the line shape of the girder of the bridge, the bridge is not easy to deform when being subjected to external force, and the prestressed steel bundles of each segment are required to be tensioned after the construction of each segment is completed. Therefore, after the construction of the midspan 1# block and the side span 1# block is completed, the prestressed steel bundles are tensioned, and stay cables are installed on the midspan 1# block and the side span 1# block, so that the stability of the midspan 1# block and the side span 1# block after the construction is completed is ensured.
S120: and a bridge deck crane is arranged on the midspan 1# block, and a guy rope hanging basket is arranged on the side span 1# block.
Optionally, after installing the bridge deck crane on the midspan 1# block, the method comprises:
the midspan 2# block is installed through the bridge deck crane, and meanwhile the unbalanced weight module is installed on the side of the midspan.
Optionally, after installing the bridge deck crane on the midspan 1# block, the method comprises:
and installing the midspan sections through the bridge deck crane until the midspan sections are folded.
After the construction of the stay ropes for construction of the midspan 1# block and the side span 1# block is completed, in order to improve the construction efficiency of a bridge, a stay rope hanging basket is installed on the side span 1# block, and a bridge deck crane is installed on the midspan 1# block so that the side span main beam and the midspan main beam can be installed simultaneously, and further the construction efficiency is improved. Wherein, guy rope hanging basket includes: a long platform guy rope hanging basket, a short platform compound guy rope hanging basket, a stock rod piece assembly guy rope hanging basket and any one of steel grade welding guy rope hanging baskets; the bridge deck crane comprises any one of a door type bridge deck crane and a mast type full-rotation crane. After the installation of the guy rope hanging basket is completed, the side span 2# block steel structure is installed on the basis of the guy rope hanging basket, concrete pouring is carried out on the side span 2# block steel structure on the basis of the guy rope hanging basket, after the concrete is solidified, the strength of the concrete is qualified, the side span 2# block is formed, and in the pouring process of the side span 2# block, the middle span 2# block is hoisted in place and installed, so that the construction efficiency is improved. As before, to ensure the linearity of the bridge, after the installation of the side span 2# block and the midspan 2# block is completed, the prestressed steel bundles of the side span 2# block and the midspan 2# block are tensioned. Meanwhile, an unbalanced weight module is arranged on the side of the midspan and used for balancing the gravity of main beams at two sides of the tower column, namely balancing the force between the side-span cantilever and the midspan cantilever, so that bridge construction can be continued, and the line type of the bridge is consistent with the design line type.
In order to complete the installation of the whole side span 2# block and the whole midspan 2# block, after the prestressed steel bundles of the side span 2# block and the midspan 2# block are tensioned, stay cables are installed on the side span 2# block and the midspan 2# block and tensioned, so that the stability and construction safety of the side span 2# block and the midspan 2# block are ensured.
After the installation of the side span 2# block and the middle span 2# block is completed, the guy rope hanging basket is moved forward, the forward moving direction of the guy rope hanging basket is the construction advancing direction along the bridge to the side span, and meanwhile, the bridge deck crane is correspondingly moved forward along the middle span construction advancing direction so as to ensure smooth construction of the side span and the middle span. In order to ensure the stress balance of the side span cantilever and the two sides of the middle span cantilever, the unbalanced weight module on the middle span is also moved forward along the construction advancing direction of the middle span.
S130: the auxiliary pier closest to the cable tower is configured as a counterweight type pulling and pressing auxiliary pier;
s140: when the side span main beam is prolonged to the counterweight type pulling and pressing auxiliary pier, the side span main beam is fixedly connected with the counterweight type pulling and pressing auxiliary pier.
Optionally, the side span main beam is extended to the front of the counterweight type pulling and pressing auxiliary pier, and comprises:
installing a concrete bearing platform on the pile foundation, and installing a pile load weight module on the bearing platform;
and mounting the pier body on the pile-loading ballast anchor block.
Optionally, the side span main beam is extended to a counterweight type tension and compression auxiliary pier, comprising:
advancing the guy rope hanging basket along the construction advancing direction of the side span;
and hoisting the steel capping beam on the pier body to form a counterweight type pull-press auxiliary pier, wherein the pier body is connected with the steel capping beam in an anchoring manner.
The auxiliary pier closest to the cable tower is configured as a balance weight type tension auxiliary pier, and the balance weight type tension auxiliary pier at the side of the side span can meet two working conditions of compression and tension. And under the condition that tension or pressure is applied to the bridge pier by the side span main girder, unbalanced stress on two sides of the main pier in the construction process of the asymmetric double-cantilever bridge is balanced. As shown in fig. 3, the counterweight type pull-press auxiliary pier comprises a pile foundation, a bearing platform 3 arranged on the pile foundation, a pile load weight module 4 arranged on the bearing platform 3, a pier body 7 arranged on the pile load weight module 4, and a steel capping beam 10 anchored on the pier body 7, wherein the pile load weight module 4 and the bearing platform 3 are consistent in size. According to the construction sequence of the pier, pile holes with preset lengths are drilled at preset positions, enough concrete can be poured in the pile holes, and the solidified concrete can ensure the stability of the whole pier.
Further, as the foundation at the upper part of the pile hole is soft, the pile hole wall is easy to collapse in the concrete pouring process, and the silt is also mixed into the concrete, so that the pile foundation is easy to form an interlayer, and the strength is not high. Accordingly, the steel pile casing 2 is lowered to a designed position along the inner wall of the pile hole, then concrete is poured into the pile hole along the steel pile casing 2, the cast-in-place pile 1 is formed after the concrete is solidified, the cast-in-place pile 1 and the steel pile casing 2 together form a pile foundation, the ratio of the length of the steel pile casing 2 sleeved on the cast-in-place pile 1 to the total length of the steel pile casing 2 is 23:63-5:7, and preferably the ratio of the length of the steel pile casing 2 sleeved on the cast-in-place pile 1 to the total length of the steel pile casing 2 is 3:10. The steel pile casing 2 isolates the silt from the concrete of the cast-in-place pile 1, the silt cannot sink into the cast-in-place pile 1, the integrity of pile holes is guaranteed, the formed pile foundation is better in stability and higher in strength, meanwhile, the pile holes are protected, and the silt cannot collapse. After pile foundation formation, a bearing platform 3, a pile load weight module 4, a pier body 7 and a steel capping beam 10 are installed in sequence.
In the application, as shown in fig. 3, the pile-loading weight module 4 is arranged between the bearing platform 3 and the pier body 7, when the counterweight type pulling-pressing auxiliary pier is pressed, the pile foundation can provide supporting force for the bridge girder, and the pile foundation cannot be in a subsidence state; when the auxiliary pier is pulled by the counterweight type pulling and pressing, the pile weight module 4 increases the weight of the pile foundation, so that the pile foundation cannot be under the action of the pier upper structure, a pulling working condition cannot occur, the whole pier can bear the pulling force generated by the unbalanced force applied to the pier, and the stability of the pile foundation can be further guaranteed. Accordingly, in order to ensure that when the pier is under tension, tension can be continuously and stably transmitted to the pier and the pile foundation is not under tension, in the embodiment provided by the application, the steel capping beam 10 is anchored on the pier body 7. In order to ensure that the stacking weight modules 4 can be stably located on the bearing platform 3, the stacking weight modules 4 have the same size as the bearing platform. For example, when the size of the base is 7×7×3.5m, the size of the stack weight module 4 is also 7×7×3.5m.
In the embodiment that this application provided, supplementary pier is pressed in counter weight formula pulling is applied to the construction of asymmetric cantilever beam, and in the supplementary pier place one side is pressed in counter weight formula pulling, adopts to hang basket installation bridge girder, because hang the basket and have certain size. In the construction process of the counterweight type pier, as shown in fig. 3, the steel cap beam 10 is firstly installed on the pier body 7, or the pier body 7 is constructed too high, so that the movement of the hanging basket can be influenced. Therefore, in the embodiment that this application provided, pier shaft 7 adopts four first steel pipe stands to constitute, has guaranteed the convenience of pier shaft 7 installation under the intensity of guaranteeing the pier shaft. In order to enable the steel cap beam 10 to be firmly connected with the pier body 7, a second steel pipe column 9 is arranged between the steel cap beam 10 and the pier body 7, so that the height of the pier is guaranteed to be consistent with the design height, and then the steel cap beam is connected with the girder of the bridge through an anchoring device 11, and the line type of the bridge can be guaranteed. The second steel pipe column 9 and the steel cap beam 10 are pre-assembled before being hoisted.
For example, if the counterweight type tension-compression auxiliary pier is disposed below the side span 8# block, the installation of the side span 8# block and the installation of the stay cable are performed at the cable hanging basket after the hanging basket moves forward through the position above the counterweight type tension-compression auxiliary pier. After the installation of the midspan 8# block and the installation of the stay cable are completed through the bridge deck crane, and the guy cable hanging basket moves forwards along the construction advancing direction of the side span and moves to the position above the counterweight type pulling and pressing auxiliary pier, the pre-assembled second steel pipe column 9 and the steel cap beam 10 are hoisted above the first steel pipe column together and put down together, so that the second steel pipe column 9 can be sleeved in the first steel pipe column, the second steel pipe column 9 is connected with the first steel pipe column, and when the counterweight type pulling and pressing auxiliary pier is pulled, the pulling force can be stably transmitted to the pier body 7 (the first steel pipe column) through the second steel pipe column 9.
In order to ensure the stability between the first steel pipe column and the second steel pipe column, a diagonal bracing 8 and a parallel connection are further arranged between the first steel pipe column and the second steel pipe column respectively, an annular stiffening rib 6 is arranged on the first steel pipe column, and concrete 5 filled in the position of the annular stiffening rib 6 is arranged in the first steel pipe column. The length ratio of the second steel pipe stand column sleeved in the first steel pipe stand column to the length ratio of the second steel pipe stand column exposed between the steel cap beam and the first steel pipe stand column is 1:5-2:5, preferably, the length ratio of the second steel pipe stand column sleeved in the first steel pipe stand column to the length ratio of the second steel pipe stand column exposed between the steel cap beam and the first steel pipe stand column is 3:10, and when the height requirement of the whole pier body is met, the second steel pipe stand column and the first steel pipe stand column are further enabled to have a larger contact area, and the stability of the second steel pipe stand column 9 and the steel cap beam 10 is further improved.
In order to ensure that the stress on two sides of the tower column can reach balance in the main beam construction process, the main beam and the pier are required to be firmly connected, so that the stress borne by the main beam can be continuously and stably transmitted to the counterweight type tension-compression auxiliary pier. Thus, as shown in fig. 3, an anchor 11 for anchoring a girder of a bridge is installed on the steel cap girder 10. Wherein, the anchoring device 11 comprises from the steel bent cap upwards in order: steel backing plate, concrete leveling block and tetrafluoro slide plate. Further, in order to ensure the stability of the connection, the steel stranded wires connecting the main girder and the steel capping beam together are also included. The steel backing plate, the concrete leveling block and the tetrafluoro slide plate enable two sides of the main girder to be in contact with the counterweight type pulling and pressing auxiliary bridge pier, so that the line type of the main girder of the bridge is ensured. After the girders on two sides of the main pier of the bridge are constructed to the preset sections, construction consolidation is formed between the girders on one side and the balance weight type tension auxiliary pier, and the normal construction of the girders is ensured by balancing the pressure or the tension applied to the girders on the side where the balance weight type tension auxiliary pier is located.
If before, after pile foundation construction is accomplished, then install the cushion cap above that, the cushion cap adopts concrete prefabrication to form, in counter weight formula pull-press auxiliary pier construction process, then can install the cushion cap on the pile foundation directly. As shown in fig. 3, in order to ensure that the pier body 7 has better stability, the pier body 7 is directly connected with the bearing platform 3, and the stacking load weight module 4 is provided with a through hole through which the first steel pipe column can pass, and the stacking load weight module 4 can be of a prefabricated concrete structure, a steel structure or the like. In the prefabrication process of the stacking and pressing weight module 4, the through hole is reserved on the stacking and pressing weight module 4 according to the size of the first steel pipe stand column and the installation position on the bearing platform, so that the first steel pipe stand column can penetrate through the through hole to be directly connected with the bearing platform 3 after the stacking and pressing weight module 4 is installed on the bearing platform 3. In other embodiments, after the connection between the first steel pipe upright post and the bearing platform is completed, the pile load weight module 4 is further installed on the bearing platform, so that the pile load weight module 4 can be better attached to the bearing platform 3, and the pile load weight module 4 can also generate a certain tensile force to the pier body 7, so that the tensile strength and stability of the pier body 7 are ensured.
As shown in fig. 3, in order to secure the connection stability of the pier shaft 7 with the cap 3, and the pile foundation can provide a stable support for the cap 3 continuously. When the cushion cap is prefabricated, anchor connection structure 11 in cushion cap 3, connection structure 11 one end is connected with first steel pipe stand, and the other end is connected with steel pile casing 2, and wherein connection structure 11 is provided with the stiffening plate with the one end that steel pile casing 2 is connected, and steel pile casing 2 is also provided with the stiffening plate with connection structure 11 connected one end, and the stiffening plate has increased steel pile casing 2 and connection structure 11 bearing rigidity and stability for steel pile casing 2 is difficult for taking place the deformation with connection structure 11.
In summary, the construction method and system for the asymmetric cantilever beam of the cable-stayed bridge provided by the application comprise the following steps of
The beneficial effects are that:
according to the construction method of the asymmetric cantilever beam of the cable-stayed bridge, which is provided by the embodiment of the application, the midspan 1# block and the side span 1# block are respectively erected; a bridge deck crane is arranged on the midspan 1# block, and a guy rope hanging basket is arranged on the side span 1# block; the auxiliary pier closest to the cable tower is configured as a counterweight type pulling and pressing auxiliary pier; and when the side span main beam is prolonged to the counterweight type pulling and pressing auxiliary pier, fixedly connecting the side span main beam with the counterweight type pulling and pressing auxiliary pier. After the installation of the 1# blocks of the side span and the middle span is completed, a guy cable hanging basket is installed on the side of the side span, and a bridge deck crane is installed on the side of the middle span, so that each block of the side span main beam and the middle span main beam can be constructed simultaneously, the construction efficiency is improved, and simultaneously, stay cables of the cable-stayed bridge can be installed on corresponding blocks of the side span main beam and the middle span main beam simultaneously, so that the stress of the stay cables on the corresponding blocks is the same, and the stability and the line type of the bridge in the construction process and after the construction of the cable-stayed bridge are ensured. Meanwhile, the counterweight type pulling and pressing auxiliary pier ensures that the corresponding side span and middle span joint blocks can be smoothly constructed.
The construction system of the asymmetric cantilever beam of the cable-stayed bridge is characterized in that a bridge deck crane is arranged on the midspan main beam and used for hoisting midspan sections; the guy rope hanging basket is arranged on the side span main beam and is used for installing the side span main beam steel structure and carrying out concrete pouring on the side span main beam concrete structure; the counterweight type pulling and pressing auxiliary pier is arranged on the side of the side span main beam and used for supporting the side span main beam; or the tension counterweight type tension-compression auxiliary pier used for balancing the side span main beam ensures the stress balance in the construction process of the asymmetric double cantilever beam of the cable-stayed bridge, thereby ensuring the stability in the construction process of the asymmetric double cantilever, ensuring the smooth proceeding of bridge construction and ensuring the construction efficiency.
The foregoing is only a partial embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations should and are intended to be comprehended within the scope of the present invention.
Claims (9)
1. The construction method of the asymmetric cantilever beam of the cable-stayed bridge is characterized by comprising the following steps of:
constructing a midspan 0# block and a side span 0# block on the tower column;
a bracket based on a tower column is respectively provided with a midspan 1# block and a side span 1# block;
a bridge deck crane is arranged on the midspan 1# block, and a guy rope hanging basket is arranged on the side span 1# block;
assembling the middle span by using the bridge deck crane until the middle span is folded, and realizing balance weight by using a balance weight type pulling and pressing auxiliary pier at the side of the side span;
and assembling the side span by using the guy rope hanging basket until the side span is folded, and realizing balance weight by using an unbalanced weight module at the side of the middle span.
2. The method of claim 1, wherein the midspan 0# block is a reinforced concrete joint section and the side span 0# block is a steel structure with concrete poured inside.
3. The method of claim 2, wherein constructing midspan 0# blocks and side span 0# blocks on the tower comprises:
installing a side span 0# block steel structure on the tower column;
hoisting a prefabricated midspan 0# block to a tower column and connecting the prefabricated midspan 0# block with a side span 0# block steel structure;
and (5) carrying out concrete pouring on the side span 0# block steel structure.
4. The method of claim 1, wherein the weighted pull and press auxiliary pier comprises: pile foundation, pile cap set up on the said pile foundation, pile load weight module set up on the said pile cap, set up in pile load weight module pier shaft, and anchor steel capping beam on the said pier shaft; the pier body adopts 4 first steel pipe stands to constitute, the pier body with still be provided with the second steel pipe stand between the steel bent cap, and the second steel pipe stand with first steel pipe stand is connected.
5. The method of claim 4, wherein the installing of the weight type pull and press auxiliary pier comprises:
installing pile foundations, bearing platforms, pile load weight modules and first steel pipe stand columns;
the guy rope hanging basket moves forwards along the construction advancing direction of the side span;
after moving through the position above the counterweight type pulling and pressing auxiliary pier, hoisting the pre-assembled second steel pipe upright post and the steel cap beam above the first steel pipe upright post;
connecting the second steel pipe column with the first steel pipe column;
and anchoring the steel bent cap with the side span.
6. The method of claim 5, wherein connecting the second steel pipe column with the first steel pipe column comprises sleeving the second steel pipe column in the first steel pipe column, wherein the ratio of the length of the second steel pipe column sleeved in the first steel pipe column to the length of the second steel pipe column exposed between the steel cap beam and the first steel pipe column is 1:5-2:5.
7. The method of claim 5, wherein the steps of installing the pile foundation, the cap, the pile weight module, and the first steel pipe column are performed in synchronization with the step of advancing the guy wire basket along the direction of travel of the side span construction.
8. The method of claim 1, wherein the step of assembling the midspan with the bridge deck crane until the midspan is closed is synchronized with the step of assembling the side span with the guy wire cradle until the side span is closed.
9. The method of claim 1, wherein the bridge deck crane comprises any one of a portal bridge deck crane, a mast full swing crane; the guy rope hanging basket comprises: the long-platform guy rope hanging basket, the short-platform composite guy rope hanging basket and the stock rod piece assembly guy rope hanging basket are any one of the steel-grade welding guy rope hanging baskets.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310615905.9A CN116516793A (en) | 2020-12-31 | 2020-12-31 | Construction method of asymmetric cantilever beam of cable-stayed bridge |
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| CN202310615905.9A CN116516793A (en) | 2020-12-31 | 2020-12-31 | Construction method of asymmetric cantilever beam of cable-stayed bridge |
| CN202011632242.4A CN112695607A (en) | 2020-12-31 | 2020-12-31 | Construction method and system for asymmetric cantilever beam of cable-stayed bridge |
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