CN110565676A - Cantilever type tower crane foundation structure and construction method thereof - Google Patents
Cantilever type tower crane foundation structure and construction method thereof Download PDFInfo
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- CN110565676A CN110565676A CN201910707100.0A CN201910707100A CN110565676A CN 110565676 A CN110565676 A CN 110565676A CN 201910707100 A CN201910707100 A CN 201910707100A CN 110565676 A CN110565676 A CN 110565676A
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- 238000010276 construction Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 152
- 239000010959 steel Substances 0.000 claims abstract description 152
- 239000004567 concrete Substances 0.000 claims description 37
- 238000012946 outsourcing Methods 0.000 claims description 31
- 230000002787 reinforcement Effects 0.000 claims description 24
- 238000003466 welding Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 6
- 238000005452 bending Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004035 construction material Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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Abstract
本发明提供了一种悬臂式塔吊基础结构及其施工方法，本发明利用型钢作为悬臂牛腿结构，将塔吊安装位置由钢筋混凝土范围内延伸至钢筋混凝土范围之外，用以平衡塔吊传递至基础上的弯矩与剪力，解决塔吊基础平面位置受限且周边不满足独立基础设置的问题；利用预应力钢筋作为锚固结构主要受力构件，通过施加预拉力将型钢牛腿与承台之间实现摩擦型连接；采用钢筋混凝土结构作为保护结构，用以降低外力撞击型钢牛腿的影响和保护免受环境影响导致的腐蚀；该结构降低塔吊基础设置难度，在有限的工作条件下最大限度的减小塔吊基础构造尺寸，减小塔吊与附着物的间距、简化塔吊附墙结构，实用性强。
The invention provides a cantilever tower crane foundation structure and its construction method. The invention uses section steel as the cantilever corbel structure, and extends the installation position of the tower crane from within the range of reinforced concrete to outside the range of reinforced concrete to balance the transmission of the tower crane to the foundation. The bending moment and shear force on the ground solve the problem that the plane position of the tower crane foundation is limited and the surrounding area does not meet the requirements of independent foundation settings; the prestressed steel bar is used as the main force-bearing member of the anchorage structure, and the gap between the steel corbel and the cap is fixed by applying pretension Realize frictional connection; use reinforced concrete structure as protective structure to reduce the impact of external force on the steel corbel and protect from corrosion caused by environmental influences; this structure reduces the difficulty of setting up the foundation of the tower crane and maximizes the Reduce the size of the foundation structure of the tower crane, reduce the distance between the tower crane and the attachment, simplify the structure of the tower crane attached to the wall, and have strong practicability.
Description
技术领域technical field
本发明涉及塔吊安装施工领域，特别是一种适用于水上及受环境限制区域的悬臂式塔吊基础结构及其施工方法。The invention relates to the field of tower crane installation and construction, in particular to a cantilever type tower crane foundation structure and a construction method suitable for water and restricted areas.
背景技术Background technique
塔吊是建筑工地上最常用的一种起重设备 又名“塔式起机”，用来吊施工用的钢筋、木楞、混凝土、钢管等施工的原材料。塔吊是工地上一种必不可少的设备。Tower crane is the most commonly used lifting equipment on construction sites, also known as "tower crane", which is used to lift construction materials such as steel bars, corrugated wood, concrete, and steel pipes. Tower crane is an indispensable equipment on the construction site.
为保证塔吊的平稳安全，塔吊被安装于塔吊基础上，塔吊基础通常由较大尺寸的混凝土承台构成，现有塔吊基础多是在工地现场制作，制作工期长，而且制作的塔吊基础多不能重复使用，使用完毕后需要拆除，螺柱很难拆除，易存在安全问题。且目前空间受限的桥墩承台上无法直接安设塔吊基础，塔吊基础需要设置于水中钢管桩、钢围堰或扩大基础上，导致塔吊基础在设置时，存在以下不足：In order to ensure the stability and safety of the tower crane, the tower crane is installed on the foundation of the tower crane. The foundation of the tower crane is usually composed of a large-sized concrete cap. Most of the existing tower crane foundations are made on site, and the production period is long. It is reused and needs to be removed after use, and the studs are difficult to remove, which is prone to safety problems. Moreover, tower crane foundations cannot be installed directly on pier caps with limited space at present. Tower crane foundations need to be installed on steel pipe piles in water, steel cofferdams or enlarged foundations, resulting in the following deficiencies in the installation of tower crane foundations:
1)需要大型起重设备在承台旁插拔水中钢管桩，施工干扰大，需要将大量的钢管桩插打至泥土中，施工材料多，另外设置独立钢管桩基础时塔吊可能因为钢管的不均匀沉降而倾斜，影响安全使用，且独立基础可能会使塔吊附墙过长；塔吊设置在承台上时会占用过多的空间；1) Large-scale lifting equipment is required to insert and pull out the steel pipe piles in the water next to the cap, and the construction interference is large. A large number of steel pipe piles need to be inserted into the soil, and there are many construction materials. In addition, when setting up independent steel pipe pile foundations, the tower crane may be The uneven settlement of the steel pipes will incline, which will affect the safe use, and the independent foundation may make the wall attached to the tower crane too long; when the tower crane is installed on the cap, it will take up too much space;
2)设置在围堰上的塔吊基础，只适用于双壁钢围堰，且需将围堰与承台固定连接，在塔吊拆除前，围堰体系不能拆除，影响承台附属结构的安装，施工周期长；2) The tower crane foundation installed on the cofferdam is only applicable to the double-wall steel cofferdam, and the cofferdam must be fixedly connected to the cap. Long construction period;
3)扩大基础仅适用于地质情况较好的陆地桥梁，基础由大量的钢筋和混凝土组成，材料用量大，占用桥梁外的空间，增加施工用地，增加施工成本。3) Expanding the foundation is only suitable for land bridges with good geological conditions. The foundation is composed of a large number of steel bars and concrete, and the amount of materials is large, which occupies the space outside the bridge, increases the construction land, and increases the construction cost.
发明内容Contents of the invention
本发明的目的是提供一种悬臂式塔吊基础结构及其施工方法，其目的一是解决塔吊基础平面位置受限且周边不满足独立基础设置的问题；目的二是降低塔吊基础设置难度。The purpose of the present invention is to provide a cantilever tower crane foundation structure and its construction method. The first purpose is to solve the problem that the plane position of the tower crane foundation is limited and the surrounding area does not satisfy the independent foundation setting; the second purpose is to reduce the difficulty of tower crane foundation setting.
为解决上述技术问题，本发明提供了一种悬臂式塔吊基础结构，至少包括承台、型钢牛腿和塔吊预埋基础，所述承台的侧面设有多个预埋钢板，所述型钢牛腿设有两组，每组型钢牛腿独立承载塔吊预埋基础的两个地脚，每组型钢牛腿的一端固设于承台上，型钢牛腿的另一端悬空设置，所述型钢牛腿固定于承台的一端采用预应力钢筋反压；型钢牛腿悬空的另一端与所述预埋钢板连接。In order to solve the above technical problems, the present invention provides a cantilever type tower crane foundation structure, which at least includes a cap, a shaped steel bracket and a pre-embedded foundation of the tower crane, the side of the cap is provided with a plurality of embedded steel plates, and the shaped steel There are two sets of legs, and each set of shaped steel corbels independently bears the two feet of the pre-buried foundation of the tower crane. One end of the leg fixed to the cap is back-pressed by prestressed steel bars; the other end of the steel corbel suspended in the air is connected to the embedded steel plate.
进一步地，所述型钢牛腿由水平撑和斜撑构成，并与所述预埋钢板焊接为一整体。Further, the section steel corbel is composed of horizontal braces and diagonal braces, and is welded with the embedded steel plate as a whole.
进一步地，所述水平撑的一端固设于承台上，水平撑的另一端悬空，且所述水平撑的内部设有多个竖向的加劲板一；所述斜撑的一端与水平撑悬空的一端连接，斜撑的另一端与预埋钢板连接，且所述水平撑与斜撑的连接处设有加劲板二。Further, one end of the horizontal brace is fixed on the bearing platform, the other end of the horizontal brace is suspended, and a plurality of vertical stiffening plates are provided inside the horizontal brace; one end of the diagonal brace is connected to the horizontal brace One end suspended in the air is connected, the other end of the diagonal brace is connected with the embedded steel plate, and the connection between the horizontal brace and the diagonal brace is provided with a second stiffening plate.
进一步地，所述预埋钢板包括锚固于承台内的埋入端和与所述埋入端固定连接、贴设于所述承台表面的连接端；所述连接端与型钢牛腿之间焊接连接。Further, the pre-embedded steel plate includes an embedded end anchored in the cap and a connecting end fixedly connected to the embedded end and attached to the surface of the cap; Solder connection.
优选地，所述型钢牛腿的外侧与预埋钢板的连接端之间设置有加劲板三。Preferably, a stiffening plate three is provided between the outer side of the shaped steel bracket and the connection end of the embedded steel plate.
进一步地，所述悬臂式塔吊基础结构还包括外包混凝土钢筋，所述外包混凝土钢筋包括多根横向钢筋和多根纵向钢筋，所述多根横向钢筋、多根纵向钢筋沿型钢牛腿四周纵横交错布置，形成截面呈直角梯形的钢筋骨架。Further, the foundation structure of the cantilever tower crane also includes outsourcing concrete reinforcement, and the outsourcing concrete reinforcement includes a plurality of transverse reinforcement and a plurality of longitudinal reinforcement, and the plurality of transverse reinforcement and the plurality of longitudinal reinforcement are criss-crossed along the perimeter of the shaped steel corbel. Arranged to form a steel skeleton with a right-angled trapezoidal cross-section.
进一步地，所述钢筋骨架内浇筑有外包混凝土，所述预埋钢板、型钢牛腿和预应力钢筋均包裹于所述外包混凝土中，塔吊预埋基础嵌入于外包混凝土内且其顶端露出于外包混凝土的顶面。Further, outsourcing concrete is poured into the reinforcement skeleton, and the embedded steel plate, section steel corbel and prestressed steel bar are all wrapped in the outsourcing concrete, and the pre-embedded foundation of the tower crane is embedded in the outsourcing concrete and its top is exposed to the outsourcing concrete. Concrete top.
优选地，每组型钢牛腿至少通过4根预应力钢筋固定于承台上。Preferably, each set of shaped steel corbels is fixed on the platform by at least 4 prestressed steel bars.
进一步地，所述塔吊预埋基础与型钢牛腿之间采用焊接连接。Further, the pre-embedded foundation of the tower crane and the section steel corbel are connected by welding.
进一步地，本发明还提供了一种悬臂式塔吊基础结构的施工方法，包括以下步骤，Further, the present invention also provides a construction method of a cantilever type tower crane foundation structure, comprising the following steps,
首先在承台施工过程中安装预埋钢板、预应力钢筋和部分外包混凝土钢筋，加工型钢牛腿，待承台施工完成后，安装型钢牛腿，并将型钢牛腿与预埋钢板采用焊接连接，将型钢牛腿与预应力钢筋之间采用螺母临时固定；Firstly, the embedded steel plate, prestressed steel bar and some outsourcing concrete steel bars are installed during the construction of the cap, and the steel corbel is processed. After the construction of the cap is completed, the profile steel corbel is installed, and the profile steel corbel and the pre-embedded steel plate are connected by welding. , temporarily fix the section steel corbel and the prestressed steel bar with nuts;
然后安装塔吊预埋基础，并将塔吊预埋基础与型钢牛腿采用焊接连接，施加预应力钢筋的预应力；Then install the pre-buried foundation of the tower crane, and connect the pre-buried foundation of the tower crane with the steel corbel by welding, and apply the prestress of the prestressed steel bar;
最后安装剩余外包混凝土钢筋，最后浇筑外包混凝土。Finally, the remaining outsourcing concrete reinforcement is installed, and the outsourcing concrete is finally poured.
本发明的优点是：The advantages of the present invention are:
1.本发明利用型钢作为悬臂承载牛腿结构，将塔吊安装位置由钢筋混凝土范围内延伸至钢筋混凝土范围之外，用以平衡塔吊传递至基础上的弯矩与剪力，解决塔吊基础平面位置受限且周边不满足独立基础设置的问题；利用预应力钢筋作为锚固结构主要受力构件，通过施加预拉力将型钢牛腿与承台顶部之间实现摩擦型连接；采用钢筋混凝土结构作为保护结构，用以降低外力撞击型钢牛腿的影响和保护免受环境影响导致的腐蚀；采用本发明降低了塔吊基础设置难度，在有限的工作条件下最大限度的减小塔吊基础构造尺寸，减小塔吊与附着物的间距、简化塔吊附墙结构，实用性强。1. The present invention uses section steel as the cantilever bearing corbel structure, extends the installation position of the tower crane from within the range of reinforced concrete to outside the range of reinforced concrete, to balance the bending moment and shear force transmitted from the tower crane to the foundation, and solve the problem of the base plane position of the tower crane Restricted and the surrounding area does not meet the problem of independent foundation setting; use prestressed steel bars as the main force-bearing member of the anchorage structure, and realize frictional connection between the steel corbel and the top of the cap by applying pretension; use reinforced concrete structure as the protective structure , to reduce the impact of external force on the steel corbel and protect it from corrosion caused by environmental influences; the invention reduces the difficulty of setting up the foundation of the tower crane, minimizes the size of the foundation structure of the tower crane under limited working conditions, and reduces the size of the tower crane The distance between the tower crane and the attachment, the structure of the tower crane attached to the wall is simplified, and the practicability is strong.
为让本发明的上述内容能更明显易懂，下文特举优选实施例，并结合附图，作详细说明如下。In order to make the above-mentioned content of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail in conjunction with the accompanying drawings.
附图说明Description of drawings
下面结合附图和实施例对本发明进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
图1是悬臂式塔吊基础结构立面图；Fig. 1 is the elevation of cantilever type tower crane foundation structure;
图2是悬臂式塔吊基础结构平面图；Fig. 2 is a plan view of the foundation structure of the cantilevered tower crane;
图3是悬臂式塔吊基础结构中外包混凝土立面布置图。Fig. 3 is a layout diagram of the outsourcing concrete facade in the foundation structure of the cantilever tower crane.
附图标记说明：Explanation of reference signs:
1、承台；2、预埋钢板；2.1、埋入端；2.2、连接端；3、型钢牛腿；4、预应力钢筋；5、塔吊预埋基础；6、外包混凝土钢筋；6.1、横向钢筋；6.2、纵向钢筋；7、外包混凝土；8、加劲板一；9、加劲板二；10、加劲板三。1. Bearing platform; 2. Embedded steel plate; 2.1. Embedded end; 2.2. Connecting end; 3. Section steel corbel; 4. Prestressed reinforcement; 5. Tower crane embedded foundation; 6. Outsourcing concrete reinforcement; 6.1. Steel bar; 6.2, Longitudinal steel bar; 7, Outsourcing concrete; 8, Stiffened plate 1; 9, Stiffened plate 2; 10, Stiffened plate 3.
具体实施方式Detailed ways
以下由特定的具体实施例说明本发明的实施方式，本领域技术人员可由本说明书所揭示的内容轻易地了解本发明的其他优点及功效。The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.
需说明的是，在本发明中，图中的上、下、左、右即视为本说明书中所述的悬臂式塔吊基础结构的上、下、左、右。It should be noted that in the present invention, the upper, lower, left and right in the figure are regarded as the upper, lower, left and right of the cantilever tower crane infrastructure structure described in this specification.
现参考附图介绍本发明的示例性实施方式，然而,本发明可以用许多不同的形式来实施，并且不局限于此处描述的实施例，提供这些实施例是为了详尽地且完全地公开本发明，并且向所属技术领域的技术人员充分传达本发明的范围。对于表示在附图中的示例性实施方式中的术语并不是对本发明的限定。在附图中，相同的单元/元件使用相同的附图标记。Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units/elements are given the same reference numerals.
除非另有说明，此处使用的术语（包括科技术语）对所属技术领域的技术人员具有通常的理解含义。另外，可以理解的是，以通常使用的词典限定的术语，应当被理解为与其相关领域的语境具有一致的含义，而不应该被理解为理想化的或过于正式的意义。Unless otherwise stated, the terms (including scientific and technical terms) used herein have the meanings commonly understood by those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overly formal meanings.
实施方式一Implementation Mode 1
本发明提供的悬臂式塔吊基础结构，如图1、图2所示，至少包括承台1、型钢牛腿3和塔吊预埋基础5，所述承台1的侧面设有多个预埋钢板2，所述型钢牛腿3设有两组，每组型钢牛腿3独立承载塔吊预埋基础5的两个地脚，每组型钢牛腿3的一端固设于承台1上，型钢牛腿3的另一端悬空设置，所述型钢牛腿3固定于承台1的一端采用预应力钢筋4反压；型钢牛腿3悬空的另一端与所述预埋钢板2连接。The cantilever type tower crane foundation structure provided by the present invention, as shown in Figure 1 and Figure 2, at least includes a cap 1, a steel corbel 3 and a pre-embedded tower crane foundation 5, and the side of the cap 1 is provided with a plurality of pre-embedded steel plates 2. There are two groups of shaped steel corbels 3, each group of shaped steel corbels 3 independently bears the two feet of the pre-embedded foundation 5 of the tower crane, and one end of each group of shaped steel corbels 3 is fixed on the cap 1, and the shaped steel corbels 3 The other end of the leg 3 is suspended in the air, and one end of the shaped steel corbel 3 fixed to the platform 1 is counter-pressed by a prestressed steel bar 4;
本发明利用型钢作为悬臂牛腿结构，将塔吊安装位置由钢筋混凝土范围内延伸至钢筋混凝土范围之外，用以平衡塔吊传递至基础上的弯矩与剪力，解决塔吊基础平面位置受限且周边不满足独立基础设置的问题。In the present invention, steel is used as the cantilever corbel structure, and the installation position of the tower crane is extended from the range of reinforced concrete to outside the range of reinforced concrete, so as to balance the bending moment and shear force transmitted from the tower crane to the foundation, and solve the problem that the plane position of the tower crane foundation is limited and The surrounding does not meet the problem of independent infrastructure settings.
实施方式二Implementation Mode Two
本发明的实施方式二涉及一种悬臂式塔吊基础结构，如图1所示，它包括承台1、型钢牛腿3和塔吊预埋基础5，所述承台1的侧面设有多个预埋钢板2，所述型钢牛腿3设有两组，每组型钢牛腿3独立承载塔吊预埋基础5的两个地脚，进一步地，所述型钢牛腿3由水平撑和斜撑构成，并与所述预埋钢板2焊接为一整体，优选地所述水平撑的一端固设于承台1上，并采用预应力钢筋4反压；水平撑的另一端悬空，且所述水平撑的内部设有多个竖向的加劲板一8；所述斜撑的一端与水平撑悬空的一端连接，斜撑的另一端与预埋钢板2连接，且所述水平撑与斜撑的连接处设有加劲板二9。Embodiment 2 of the present invention relates to a cantilever tower crane foundation structure, as shown in Figure 1, it includes a cap 1, a steel corbel 3 and a tower crane pre-buried foundation 5, the side of the cap 1 is provided with a plurality of pre-buried Embedded steel plate 2, two groups of shaped steel corbels 3 are provided, and each group of shaped steel corbels 3 independently bears two foundation feet of the pre-embedded foundation 5 of the tower crane. Further, the shaped steel corbels 3 are composed of horizontal braces and diagonal braces , and welded with the pre-embedded steel plate 2 as a whole, preferably one end of the horizontal brace is fixed on the platform 1, and the prestressed steel bar 4 is used for back pressure; the other end of the horizontal brace is suspended, and the horizontal The inside of the brace is provided with a plurality of vertical stiffening plates-8; one end of the brace is connected to the suspended end of the horizontal brace, the other end of the brace is connected to the embedded steel plate 2, and the horizontal brace is connected to the The joint is provided with two stiffening plates 9.
进一步地，所述预埋钢板2包括锚固于承台1内的埋入端2.1和与所述埋入端2.1固定连接、贴设于所述承台1表面的连接端2.2；所述连接端2.2与型钢牛腿3之间焊接连接。Further, the pre-embedded steel plate 2 includes an embedded end 2.1 anchored in the platform 1 and a connection end 2.2 fixedly connected to the embedded end 2.1 and attached to the surface of the platform 1; the connection end 2.2 Welded connection with section steel corbel 3.
采用预埋钢板锚固于承台内，为型钢牛腿提供了坚实的附着基础，进一步地，在型钢牛腿3的外侧与预埋钢板2的连接端2.2之间设置有加劲板三10，从而使预埋钢板与型钢牛腿之间的连接稳固。The pre-embedded steel plate is used to anchor in the cap, providing a solid attachment foundation for the section steel corbel. Further, a stiffening plate 3 10 is provided between the outer side of the section steel corbel 3 and the connection end 2.2 of the pre-embedded steel plate 2, so that Make the connection between the embedded steel plate and the section steel corbel stable.
实施方式三Implementation Mode Three
本发明的实施方式三涉及一种悬臂式塔吊基础结构，它包括承台1、型钢牛腿3和塔吊预埋基础5，所述承台1的侧面设有多个预埋钢板2，所述型钢牛腿3设有两组，每组型钢牛腿3独立承载塔吊预埋基础5的两个地脚，每组型钢牛腿3的一端固设于承台1上，型钢牛腿3的另一端悬空设置，所述型钢牛腿3悬空的一端与所述预埋钢板2连接；型钢牛腿3固定于承台1的另一端采用预应力钢筋4反压，如图2所示，进一步地，每组型钢牛腿3至少通过4根预应力钢筋4固定于承台1上，所述预应力钢筋4优选Φ32精压螺纹钢，利用预应力钢筋作为锚固结构主要受力构件，通过施加预拉力将型钢牛腿与承台（混凝土）之间实现摩擦型连接。Embodiment 3 of the present invention relates to a cantilevered tower crane foundation structure, which includes a cap 1, a section steel corbel 3 and a pre-embedded tower crane foundation 5, the side of the cap 1 is provided with a plurality of pre-embedded steel plates 2, the There are two sets of shaped steel corbels 3, each set of shaped steel corbels 3 independently bears the two feet of the pre-buried foundation 5 of the tower crane, one end of each set of shaped steel corbels 3 is fixed on the cap 1, and the other end of the shaped steel corbels 3 One end is suspended in the air, and one end of the section steel corbel 3 suspended in the air is connected to the embedded steel plate 2; the other end of the section steel corbel 3 fixed on the platform 1 adopts prestressed steel bars 4 to counterpress, as shown in Figure 2, further Each set of steel corbels 3 is fixed on the platform 1 through at least four prestressed steel bars 4, the prestressed steel bars 4 are preferably Φ32 precision-pressed threaded steel, and the prestressed steel bars are used as the main force-bearing members of the anchoring structure. The tensile force realizes frictional connection between the steel corbel and the cap (concrete).
进一步地，如图3所示，所述悬臂式塔吊基础结构还包括外包混凝土钢筋6，所述外包混凝土钢筋6包括多根横向钢筋6.1和多根纵向钢筋6.2，所述多根横向钢筋6.1、多根纵向钢筋6.2沿型钢牛腿3轮廓/四周纵横交错布置，形成截面呈直角梯形的钢筋骨架，所述钢筋骨架内浇筑有外包混凝土7， 所述预埋钢板2、型钢牛腿3和预应力钢筋4均包裹于所述外包混凝土7中，塔吊预埋基础5嵌入于外包混凝土7内且其顶端露出于外包混凝土7的顶面。外包混凝土主要作用是防止塔吊基础受到撞击。Further, as shown in Fig. 3, the cantilever tower crane foundation structure also includes outsourcing concrete reinforcement 6, and the outsourcing concrete reinforcement 6 includes a plurality of transverse reinforcement bars 6.1 and a plurality of longitudinal reinforcement bars 6.2, and the plurality of transverse reinforcement bars 6.1, A plurality of longitudinal steel bars 6.2 are arranged criss-cross along the profile/surroundings of the shaped steel corbel 3 to form a steel bar skeleton with a right-angled trapezoidal cross-section. Outsourcing concrete 7 is poured into the steel bar skeleton. The stress steel bars 4 are all wrapped in the outsourcing concrete 7 , the tower crane pre-embedded foundation 5 is embedded in the outsourcing concrete 7 and its top is exposed on the top surface of the outsourcing concrete 7 . The main function of the outsourcing concrete is to prevent the foundation of the tower crane from being impacted.
本发明采用钢筋混凝土结构作为保护结构，用以降低外力撞击型钢牛腿的影响和保护免受环境影响导致的腐蚀；该结构降低塔吊基础设置难度，在有限的工作条件下最大限度的减小塔吊基础构造尺寸，减小塔吊与附着物的间距、简化塔吊附墙结构实用性强，值得在今后施工中进一步推广。The invention adopts the reinforced concrete structure as the protective structure to reduce the impact of external force hitting the steel corbel and to protect from corrosion caused by environmental influences; this structure reduces the difficulty of setting up the foundation of the tower crane and minimizes the tower crane under limited working conditions. The size of the basic structure, reducing the distance between the tower crane and the attachment, and simplifying the structure of the tower crane attached to the wall are highly practical and worthy of further promotion in future construction.
实施方式四Implementation Mode Four
本发明的实施方式四涉及一种悬臂式塔吊基础结构的施工方法，包括以下步骤：首先在承台1施工过程中安装预埋钢板2、预应力钢筋4和部分外包混凝土钢筋，加工型钢牛腿3，待承台1施工完成后，安装型钢牛腿3，并将型钢牛腿3与预埋钢板2之间采用焊接连接，将型钢牛腿3与预应力钢筋4之间采用螺母临时固定；然后安装塔吊预埋基础5，并将塔吊预埋基础5与型钢牛腿3采用焊接连接，施加预应力钢筋4的预应力；最后安装剩余外包混凝土钢筋6，并浇筑外包混凝土7。其中所述预埋钢板2、型钢牛腿3、预应力钢筋4和外包混凝土钢筋6均在后场加工加工完成，实施时，运送至前场进行安装。Embodiment 4 of the present invention relates to a construction method of a cantilevered tower crane foundation structure, which includes the following steps: firstly, during the construction process of cap 1, pre-embedded steel plates 2, prestressed steel bars 4 and partially outsourced concrete steel bars are installed, and shaped steel corbels are processed. 3. After the construction of cap cap 1 is completed, the section steel corbel 3 is installed, and the section steel corbel 3 and the embedded steel plate 2 are connected by welding, and the section steel corbel 3 and the prestressed steel bar 4 are temporarily fixed with nuts; Then the pre-embedded foundation 5 of the tower crane is installed, and the pre-embedded foundation 5 of the tower crane is connected with the steel corbel 3 by welding, and the prestress of the prestressed steel bar 4 is applied; finally, the remaining outsourcing concrete steel bar 6 is installed, and the outsourcing concrete 7 is poured. Wherein, the pre-embedded steel plate 2, section steel corbel 3, prestressed steel bar 4 and outsourcing concrete steel bar 6 are all processed in the back field, and are transported to the front field for installation during implementation.
以上实施例没有具体描述的部分都属于本技术领域的公知部件和常用结构或常用手段，此处不再一一详细说明。Parts not specifically described in the above embodiments belong to well-known components and common structures or common means in the technical field, and will not be described in detail here.
以上结合附图实施例对本发明进行了详细说明，本领域中普通技术人员可根据上述说明对本发明做出种种变化例。因而，实施例中的某些细节不应构成对本发明的限定，本发明将以所附权利要求书界定的范围作为本发明的保护范围。The present invention has been described in detail above with reference to the embodiments of the accompanying drawings, and those skilled in the art can make various changes to the present invention according to the above description. Therefore, some details in the embodiments should not be construed as limiting the present invention, and the present invention will take the scope defined by the appended claims as the protection scope of the present invention.
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