CN105926457A - Method for mounting steel box girders in main tower area of cable-stayed bridge and auxiliary girder erection crane base - Google Patents
Method for mounting steel box girders in main tower area of cable-stayed bridge and auxiliary girder erection crane base Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及大桥施工方法，尤其是涉及一种斜拉桥主塔区钢箱梁安装新方法及辅助用架梁吊机底座。The invention relates to a bridge construction method, in particular to a new method for installing a steel box girder in the main tower area of a cable-stayed bridge and an auxiliary girder erecting crane base.
背景技术Background technique
近年来，我国经济和社会快速发展，铁路、公路等基础设施建设日新月异，跨越江河湖海的大跨度钢箱梁斜拉桥掀起了建设高潮。修建跨越江河湖海的大跨度斜拉桥，受水文地质条件等的影响，施工难度极大。利用现有技术架设跨越江河湖海的大跨度斜拉桥，需要的投入大、风险高。In recent years, my country's economy and society have developed rapidly, and infrastructure construction such as railways and highways has changed with each passing day. The long-span steel box girder cable-stayed bridges spanning rivers, lakes and seas have set off a construction climax. The construction of long-span cable-stayed bridges across rivers, lakes and seas is extremely difficult due to the influence of hydrogeological conditions. Using existing technology to erect long-span cable-stayed bridges across rivers, lakes and seas requires a large investment and high risks.
目前，钢箱梁斜拉桥修建的过程一般如下：先安装主塔区钢箱梁，再在主塔区钢箱梁的顶面安装桥面架梁吊机，然后以主塔为中心，向两侧对称悬臂架设钢箱梁。其中，最关键的是主塔区钢箱梁及桥面架梁吊机的安装。At present, the construction process of steel box girder cable-stayed bridges is generally as follows: first install the steel box girder in the main tower area, and then install the deck girder crane on the top surface of the steel box girder in the main tower area, and then use the main tower as the center to Steel box girders are erected with symmetrical cantilevers on both sides. Among them, the most critical is the installation of the steel box girder in the main tower area and the bridge deck girder crane.
1、大江大河上的斜拉桥主塔区钢箱梁通常采用浮吊架设：利用大型浮吊及辅助滑移措施安装主塔横梁顶钢箱梁节段；利用浮吊架设主跨侧第一个钢箱梁节段，并与横梁顶钢箱梁节段连接；利用浮吊架设边跨侧第一个钢箱梁节段，并与横梁顶钢箱梁节段连接，至此，主塔区钢箱梁(一般3个节段)架设完成；1. Steel box girders in the main tower area of cable-stayed bridges on large rivers are usually erected by floating cranes: use large-scale floating cranes and auxiliary sliding measures to install steel box girder sections on the top of the main tower beams; The first steel box girder section is connected with the steel box girder section at the top of the cross beam; the first steel box girder section at the side span side is set up with a floating hanger and connected with the steel box girder section at the top of the cross beam. So far, the main tower area The erection of steel box girder (generally 3 sections) is completed;
2、在主塔区钢箱梁顶面对称拼装两台桥面架梁吊机。2. Symmetrically assemble two deck girder cranes on the top surface of the steel box girder in the main tower area.
该架设方案存在以下限制：1、主塔区钢箱梁节段的吊装以及架梁吊机的拼装受到浮吊吊高的限制。在岸坡陡峻的峡谷河流地区，桥面与河床的高差非常大，常常超过100米，基本上没有浮吊的吊高能满足钢箱梁架设以及架梁吊机拼装的需要；2、有些地区，受通航条件等的限制，大型浮吊难以到达桥位。例如在长江上游地区，受三峡船闸的限制，大型浮吊难以通过船闸到达桥位。而在沿海某些滩涂地区，水深难以满足大型浮吊吃水深度条件。The erection scheme has the following limitations: 1. The hoisting of steel box girder segments in the main tower area and the assembly of girder cranes are limited by the height of the floating crane. In canyon and river areas with steep bank slopes, the height difference between the bridge deck and the river bed is very large, often exceeding 100 meters. Basically, there is no floating crane with a lifting height that can meet the needs of steel box girder erection and girder crane assembly; 2. In some areas , due to the limitation of navigation conditions, etc., it is difficult for large floating cranes to reach the bridge position. For example, in the upper reaches of the Yangtze River, due to the restrictions of the Three Gorges ship lock, it is difficult for large floating cranes to pass through the ship lock to reach the bridge position. However, in some tidal flat areas along the coast, the water depth is difficult to meet the draft conditions of large floating cranes.
发明内容Contents of the invention
本发明的目的是提供一种斜拉桥主塔区钢箱梁安装方法,该方法在桥面与河床高差非常大的情况下，不受浮吊吊高限制。The object of the present invention is to provide a steel box girder installation method in the main tower area of a cable-stayed bridge, which is not limited by the height of the floating crane when the height difference between the bridge deck and the river bed is very large.
本发明的另一目的是提供上述斜拉桥主塔区钢箱梁安装方法的辅助用架梁吊机底座。Another object of the present invention is to provide an auxiliary girder-erecting crane base for the installation method of the steel box girder in the main tower area of the above-mentioned cable-stayed bridge.
如上构思，本发明的技术方案是：一种斜拉桥主塔区钢箱梁安装方法，其特征在于：包括如下步骤：Conceived as above, the technical solution of the present invention is: a method for installing a steel box girder in the main tower area of a cable-stayed bridge, characterized in that it includes the following steps:
一种斜拉桥主塔区钢箱梁安装方法，施工步骤如下：A method for installing a steel box girder in the main tower area of a cable-stayed bridge, the construction steps are as follows:
①第一台变幅式架梁吊机安装：利用墩旁塔吊，在主塔墩旁拼装主塔区钢箱梁的支承托架，在支承托架顶部固装滑道梁；在滑道梁上拼装架梁吊机底座，并将其与滑道梁固接；在架梁吊机底座上拼装第一台变幅式架梁吊机，并将其锚固在架梁吊机底座上；①Installation of the first luffing beam crane: use the tower crane next to the pier to assemble the supporting bracket of the steel box girder in the main tower area next to the main tower pier, and fix the slideway beam on the top of the support bracket; Assemble the base of the beam erecting crane and fix it with the slideway beam; assemble the first luffing beam erecting crane on the base of the beam erecting crane and anchor it to the base of the beam erecting crane;
②主塔区第一个钢箱梁节段的吊装及滑移：利用已拼装好的第一台变幅式架梁吊机吊装主塔区第一个钢箱梁节段，并与架梁吊机底座连接牢固，然后将架梁吊机底座、第一个钢箱梁节段及第一台变幅式架梁吊机整体纵移至设计位置，使得支承托架前端露出吊装主塔区第二个钢箱梁节段的位置；② Hoisting and sliding of the first steel box girder section in the main tower area: use the assembled first luffing beam erecting crane to hoist the first steel box girder section in the main tower area, and The base of the crane is firmly connected, and then the base of the beam erecting crane, the first steel box girder segment and the first luffing beam erecting crane are moved longitudinally to the design position, so that the front end of the support bracket is exposed to the hoisting main tower area The location of the second steel box girder segment;
③主塔区第二个钢箱梁节段的吊装：第一台变幅式架梁吊机走行至第一个钢箱梁节段前端，利用第一台变幅式架梁吊机吊装主塔区第二个钢箱梁节段，并与第一个钢箱梁节段连接；③ Hoisting of the second steel box girder section in the main tower area: the first luffing girder crane travels to the front end of the first steel box girder section, and the first luffing girder crane is used to hoist the main The second steel box girder section in the tower area and connected with the first steel box girder section;
④拆除架梁吊机底座：将第一台变幅式架梁吊机、架梁吊机底座、第一个钢箱梁节段及第二个钢箱梁节段整体纵移至设计位置，第一台变幅式架梁吊机走行至第二个钢箱梁节段前端，利用墩旁塔吊拆除架梁吊机底座；④ Remove the base of the beam erecting crane: move the first luffing beam erecting crane, the base of the beam erecting crane, the first steel box girder section and the second steel box girder section longitudinally to the design position, The first luffing girder crane travels to the front end of the second steel box girder section, and the base of the girder crane is removed by the tower crane next to the pier;
⑤主塔区第三个钢箱梁节段吊装及主塔区钢箱梁整体滑移就位：利用第一台变幅式架梁吊机吊装主塔区第三个钢箱梁节段，并与第二个钢箱梁节段连接，然后将三个钢箱梁节段连同架梁吊机整体滑移就位，精确调整主塔区钢箱梁位置并与主塔临时固结；⑤ Hoisting of the third steel box girder section in the main tower area and the overall sliding of the steel box girder in the main tower area: use the first luffing beam erecting crane to hoist the third steel box girder section in the main tower area, And connect with the second steel box girder section, then slide the three steel box girder sections together with the girder crane into place, precisely adjust the position of the steel box girder in the main tower area and temporarily consolidate with the main tower;
⑥第二台变幅式架梁吊机拼装：主塔区钢箱梁架设完毕后，第一台变幅式架梁吊机走行至第三个钢箱梁节段前端，利用墩旁塔吊在第一个钢箱梁节段顶面拼装第二台变幅式架梁吊机，然后对称挂设第一对斜拉索，进入对称悬臂架设阶段。⑥Assembly of the second luffing beam erecting crane: After the erection of the steel box girder in the main tower area, the first luffing beam erecting crane travels to the front end of the third steel box girder section, and uses the tower crane beside the pier to The second luffing girder crane is assembled on the top of the first steel box girder segment, and then the first pair of stay cables is hung symmetrically, entering the stage of symmetrical cantilever erection.
上述辅助用架梁吊机底座，包括两根主纵梁、两根横梁、底部锚固装置和架梁吊机锚座；其中：两根主纵梁平行布置，支承在支撑托架顶端滑道梁上的滑块上，且通过底部锚固装置固定；两根主纵梁的平面位置与钢箱梁的腹板对应；两根主纵梁的前、后两端连接有两根横梁，分别与架梁吊机前后支点相对应，与主纵梁一起形成架梁吊机底座的主体框架；架梁吊机通过固装在主纵梁上的架梁吊机锚座与主纵梁固定。The base of the above-mentioned auxiliary girder erecting crane includes two main longitudinal beams, two cross beams, bottom anchoring devices and anchors of the girder erecting crane; wherein: the two main longitudinal beams are arranged in parallel, supported on the top slideway beam of the supporting bracket and fixed by the bottom anchoring device; the plane position of the two main longitudinal beams corresponds to the web plate of the steel box girder; two beams are connected to the front and rear ends of the two main longitudinal beams, respectively The front and rear fulcrums of the beam crane correspond to each other, and together with the main longitudinal beam, form the main frame of the base of the beam erecting crane; the beam erecting crane is fixed to the main longitudinal beam through the beam erecting crane anchor seat fixed on the main longitudinal beam.
上述架梁吊机底座及第一台变幅式架梁吊机在支承托架上的安装位置，应比支承托架前端至少缩回2/3L，其中L为主塔区第一个钢箱梁节段长度。The base of the above-mentioned girder erecting crane and the installation position of the first luffing girder erecting crane on the supporting bracket should be retracted at least 2/3L than the front end of the supporting bracket, where L is the first steel box in the main tower area Beam segment length.
上述两根主纵梁之间连接有用于形成稳定结构的平面连接系。A planar connection system for forming a stable structure is connected between the above two main longitudinal beams.
上述主纵梁高度与钢箱梁高度相同。The height of the above-mentioned main longitudinal girder is the same as that of the steel box girder.
上述主纵梁与横梁及平面连接系之间均采用螺栓连接。Bolts are used to connect the above-mentioned main longitudinal beams to the beams and the plane connection system.
上述主纵梁采用焊接“工”字形结构，其腹板厚度与钢箱梁的腹板厚度相同，翼缘板为厚度大于24mm的钢板。The above-mentioned main longitudinal beam adopts a welded "I"-shaped structure, and its web thickness is the same as that of the steel box girder, and the flange plate is a steel plate with a thickness greater than 24mm.
上述横梁采用焊接“工”字形结构，其腹板采用厚度大于16mm的钢板，翼缘板采用厚度大于24mm的钢板。The above-mentioned beam adopts a welded "I"-shaped structure, its web plate adopts a steel plate with a thickness greater than 16mm, and the flange plate adopts a steel plate with a thickness greater than 24mm.
上述平面连接系构件采用焊接H型钢。The components of the above-mentioned planar connection system adopt welded H-shaped steel.
本发明的斜拉桥主塔区钢箱梁的架设步骤共分为：第一台变幅式架梁吊机安装；主塔区第一个钢箱梁节段吊装及滑移；主塔区第二个钢箱梁节段吊装；拆除架梁吊机底座；主塔区第三个钢箱梁节段吊装及主塔区钢箱梁整体滑移就位；第二台变幅式架梁吊机拼装六个步骤。该斜拉桥主塔区钢箱梁的架设方法尤其适用于桥面与水面高差较大、常规浮吊吊装方案难以实施的情况，具有不受浮吊吊高的限制，不受浮吊航行条件限制的优点，而且方法简单、新颖，设备投入少，具有较好的经济效益和社会效益。The erection steps of the steel box girder in the main tower area of the cable-stayed bridge of the present invention are divided into: the installation of the first luffing type girder crane; the hoisting and sliding of the first steel box girder section in the main tower area; the main tower area Hoisting of the second steel box girder segment; removal of the girder crane base; hoisting of the third steel box girder segment in the main tower area and the overall sliding of the steel box girder in the main tower area; the second luffing type girder There are six steps in crane assembly. The erection method of the steel box girder in the main tower area of the cable-stayed bridge is especially suitable for the situation where the height difference between the bridge deck and the water surface is large and the conventional floating crane hoisting scheme is difficult to implement. The advantages of limited conditions, and the method is simple, novel, less investment in equipment, and has good economic and social benefits.
附图说明Description of drawings
图1为本发明的结构布置示意图；Fig. 1 is the structural layout schematic diagram of the present invention;
图2为本发明的第一个架设步骤的示意图；Fig. 2 is the schematic diagram of the first erection step of the present invention;
图3为本发明的第二个架设步骤的示意图；Fig. 3 is the schematic diagram of the second erection step of the present invention;
图4为本发明的第三个架设步骤的示意图；Fig. 4 is the schematic diagram of the third erection step of the present invention;
图5为本发明的第四个架设步骤的示意图；Fig. 5 is the schematic diagram of the 4th erection step of the present invention;
图6为本发明的第五个架设步骤的示意图；Fig. 6 is the schematic diagram of the fifth erection step of the present invention;
图7为本发明的第六个架设步骤的示意图；Fig. 7 is the schematic diagram of the sixth erection step of the present invention;
图8为辅助用架梁吊机底座的结构示意图；Fig. 8 is a schematic structural view of the base of the auxiliary beam erecting crane;
图9为图8的A-A向示意图；Fig. 9 is a schematic diagram of A-A direction of Fig. 8;
图10为图8的B-B向示意图。FIG. 10 is a schematic view along the B-B direction of FIG. 8 .
具体实施方式detailed description
下面结合实施例并对照附图对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the embodiments and with reference to the accompanying drawings.
一种斜拉桥主塔区钢箱梁安装方法，施工步骤如下：A method for installing a steel box girder in the main tower area of a cable-stayed bridge, the construction steps are as follows:
1、第一台变幅式架梁吊机6安装：利用墩旁塔吊，在主塔墩1旁拼装主塔区钢箱梁的支承托架2，在支承托架2顶安装滑道梁3并连接牢固；在滑道梁3上拼装架梁吊机底座4，并通过锚固装置5将架梁吊机底座4与滑道梁3连接牢固；在架梁吊机底座4上拼装第一台变幅式架梁吊机6，并通过架梁吊机锚座7锚固在架梁吊机底座4上；1. Installation of the first luffing beam crane 6: use the tower crane next to the pier to assemble the supporting bracket 2 of the steel box girder in the main tower area next to the main tower pier 1, and install the slideway beam 3 on the top of the supporting bracket 2 and connect firmly; assemble the beam crane base 4 on the slideway beam 3, and connect the beam crane base 4 and the slideway beam 3 firmly through the anchor device 5; assemble the first beam crane base 4 on the beam crane base 4 The luffing beam erecting crane 6 is anchored on the beam erecting crane base 4 through the beam erecting crane anchor seat 7;
架梁吊机底座4及第一台变幅式架梁吊机6在支承托架2上的安装位置，应比支承托架2前端至少缩回2/3L(L为主塔区第一个钢箱梁节段8的长度)，使得主塔区第一个钢箱梁节段8安装后，架梁吊机底座4、第一台变幅式架梁吊机6及第一个钢箱梁节段8的整体重心位于支承托架2范围以内，保证钢箱梁节段8的倾覆稳定性；The installation position of the base 4 of the beam erecting crane and the first luffing beam erecting crane 6 on the support bracket 2 shall be at least 2/3L retracted from the front end of the support bracket 2 (L is the first one in the main tower area). steel box girder section 8), so that after the installation of the first steel box girder section 8 in the main tower area, the girder erecting crane base 4, the first luffing beam erecting crane 6 and the first steel box The overall center of gravity of the beam segment 8 is located within the range of the support bracket 2, ensuring the overturning stability of the steel box girder segment 8;
2、主塔区第一个钢箱梁节段8的吊装及滑移：利用已拼装好的第一台变幅式架梁吊机6吊装主塔区第一个钢箱梁节段8，并与架梁吊机底座4连接牢固，然后将架梁吊机底座4、第一个钢箱梁节段8及第一台变幅式架梁吊机6整体纵移至设计位置，使得支承托架2前端露出吊装主塔区第二个钢箱梁节段9的位置；2. Hoisting and sliding of the first steel box girder section 8 in the main tower area: use the assembled first luffing beam erecting crane 6 to hoist the first steel box girder section 8 in the main tower area, And firmly connected with the base 4 of the beam erecting crane, and then move the base 4 of the beam erecting crane, the first steel box girder segment 8 and the first luffing beam erecting crane 6 to the design position as a whole, so that the supporting The front end of the bracket 2 exposes the position of the second steel box girder segment 9 in the hoisting main tower area;
3、主塔区第二个钢箱梁节段9的吊装：第一台变幅式架梁吊机6走行至第一个钢箱梁节段8前端，利用第一台变幅式架梁吊机6吊装主塔区第二个钢箱梁节段9，并与第一个钢箱梁节段8连接；3. Hoisting of the second steel box girder section 9 in the main tower area: the first luffing beam erecting crane 6 travels to the front end of the first steel box girder section 8, and the first luffing beam erecting machine is used The crane 6 lifts the second steel box girder segment 9 in the main tower area and connects it with the first steel box girder segment 8;
4、拆除架梁吊机底座4：将第一台变幅式架梁吊机6、架梁吊机底座4、第一个钢箱梁节段8及第二个钢箱梁节段9整体纵移至设计位置，第一台变幅式架梁吊机6走行至第二个钢箱梁节段9前端，利用墩旁塔吊拆除架梁吊机底座4；4. Remove the girder erecting crane base 4: integrate the first luffing beam erecting crane 6, the girder erecting crane base 4, the first steel box girder segment 8 and the second steel box girder segment 9 Move longitudinally to the design position, the first luffing beam erecting crane 6 travels to the front end of the second steel box girder segment 9, and use the tower crane next to the pier to remove the beam erecting crane base 4;
5、主塔区第三个钢箱梁节段10吊装及主塔区钢箱梁整体滑移就位：利用第一台变幅式架梁吊机6吊装主塔区第三个钢箱梁节段10，并与第二个钢箱梁节段9连接，然后将三个钢箱梁节段8、9、10连同第一台变幅式架梁吊机6整体滑移就位，精确调整主塔区钢箱梁位置并与主塔1临时固结；5. Hoisting of the third steel box girder section 10 in the main tower area and the overall sliding position of the steel box girder in the main tower area: use the first luffing beam erecting crane 6 to hoist the third steel box girder in the main tower area segment 10, and is connected with the second steel box girder segment 9, and then the three steel box girder segments 8, 9, 10 together with the first luffing beam crane 6 are slid into place as a whole, precisely Adjust the position of the steel box girder in the main tower area and temporarily consolidate it with the main tower 1;
6、第二台变幅式架梁吊机11拼装：主塔区钢箱梁架设完毕后，第一台变幅式架梁吊机6走行至第三个钢箱梁节段10前端，利用墩旁塔吊在第一个钢箱梁节段8顶面拼装第二台变幅式架梁吊机11，然后对称挂设第一对斜拉索12，进入对称悬臂架设阶段。6. Assembly of the second luffing beam erecting crane 11: After the steel box girder in the main tower area is erected, the first luffing beam erecting crane 6 travels to the front end of the third steel box girder section 10, and uses The tower crane next to the pier assembles the second luffing beam erecting crane 11 on the top surface of the first steel box girder segment 8, and then hangs the first pair of stay cables 12 symmetrically, entering the stage of symmetrical cantilever erection.
上述架梁吊机底座4由主纵梁4-1、横梁4-3、底部锚固装置5、平面连接系4-4、架梁吊机锚座7组成。其中：两根主纵梁4-1支承在滑道梁3顶面的滑块4-2上，并通过底部锚固装置5固定在支承托架2顶端的滑道梁3上；两根主纵梁4-1平行布置，其平面位置与钢箱梁的腹板13对应，主纵梁4-1高度与钢箱梁高度相同，使得架梁吊机6可以从架梁吊机底座4上平顺走行至钢箱梁顶面；两根主纵梁4-1的前后两端布置有两根横梁4-3，分别与架梁吊机6的前后支点相对应，与主纵梁4-1一起形成架梁吊机底座4的主体框架；两根主纵梁4-1之间还设置有用于形成稳定结构的平面连接系4-4；在主纵梁4-1顶面设置有架梁吊机锚座7，用于锚固架梁吊机6。The beam-erecting crane base 4 is composed of a main longitudinal beam 4-1, a crossbeam 4-3, a bottom anchoring device 5, a plane connecting system 4-4, and a beam-erecting crane anchor seat 7. Among them: two main longitudinal beams 4-1 are supported on the slider 4-2 on the top surface of the slideway beam 3, and are fixed on the slideway beam 3 at the top of the support bracket 2 through the bottom anchoring device 5; The beam 4-1 is arranged in parallel, and its plane position corresponds to the web plate 13 of the steel box girder. Walk to the top surface of the steel box girder; two beams 4-3 are arranged at the front and rear ends of the two main longitudinal beams 4-1, respectively corresponding to the front and rear fulcrums of the beam erecting crane 6, together with the main longitudinal beams 4-1 Form the main frame of the base 4 of the beam erecting crane; a plane connection system 4-4 for forming a stable structure is also arranged between the two main longitudinal beams 4-1; a beam erecting crane is arranged on the top surface of the main longitudinal beams 4-1 Machine anchor seat 7 is used for anchoring beam crane 6.
主纵梁与横梁及平面连接系之间均采用螺栓连接，以便于拆装，并形成稳定结构；主纵梁采用焊接“工”字形结构，其腹板厚度与钢箱梁的腹板13厚度相同，翼缘板为厚度24mm以上钢板；横梁采用焊接“工”字形结构，其腹板采用厚度16mm以上钢板，翼缘板采用厚度24mm以上钢板；平面连接系4-4的构件采用焊接H型钢。Bolts are used to connect the main longitudinal girder with the cross beam and the plane connection system, so as to facilitate disassembly and assembly, and form a stable structure; The same, the flange plate is a steel plate with a thickness of 24mm or more; the beam adopts a welded "I"-shaped structure, its web plate is made of a steel plate with a thickness of 16mm or more, and the flange plate is made of a steel plate with a thickness of 24mm or more; the components of the plane connection system 4-4 are welded H-shaped steel .
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