WO2023213068A1 - Hoisting method for entire large diameter variable circular cross section steel bar segment - Google Patents
Hoisting method for entire large diameter variable circular cross section steel bar segment Download PDFInfo
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- WO2023213068A1 WO2023213068A1 PCT/CN2022/131890 CN2022131890W WO2023213068A1 WO 2023213068 A1 WO2023213068 A1 WO 2023213068A1 CN 2022131890 W CN2022131890 W CN 2022131890W WO 2023213068 A1 WO2023213068 A1 WO 2023213068A1
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- steel bar
- bar segments
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- steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 160
- 239000010959 steel Substances 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000003032 molecular docking Methods 0.000 claims description 17
- 230000002787 reinforcement Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
Definitions
- This application relates to the field of bridge construction, and in particular to a method for integrally hoisting large-diameter rounded-section steel bar segments.
- the hoisting of large-diameter steel bar segments requires controlling the deformation amplitude of the steel bar after lifting. It is easier to control the deformation degree of steel bar segments with a centrally symmetrical cross-section through existing technology, but for large-diameter steel bar segments with a non-centrally symmetrical cross-sectional shape It is difficult to control the deformation of steel bar segments after lifting, mainly because the deformation characteristics and deformation amount of steel bar segments with larger diameters and non-center symmetrical cross-sectional shapes when hoisted as a whole are different from the conventional situation.
- the purpose of this application is to at least partially improve the shortcomings of the existing technology and provide an easy-to-operate and effective method for integrally hoisting large-diameter rounded cross-section steel bar segments.
- An overall hoisting method for large-diameter rounded-section steel bar segments which includes the following steps:
- the binding of steel bar segments according to a preset rounded cross-sectional profile includes:
- the steel bar segments include a stiff frame, most of the main bars and stirrups connecting the main bars.
- the hanging points are configured to be non-coplanar to adapt to the deformation of the steel bar segments.
- the hanging points are arranged on the main ribs.
- the spreader includes a coplanar upper structure and a non-coplanar lower structure.
- the lower structure includes a number of movable hangers suspended below the upper structure.
- the movable hangers correspond to the hanging points.
- the movable hanger is connected to the upper structure through an adjustable connecting piece for adjusting the height and plane position of the movable hanger.
- the first unloading of the spreader includes: unloading a load of 60% to 85% of the total load.
- the method of this application makes reasonable use of the shape and deformation characteristics of the large-diameter rounded cross-section steel bar segments. First, connect the main bars of the arc segments with smaller deformation, and then unload most of the stress on the main hook, allowing the steel bar segments to Restore the shape, and then connect the main bars at the straight line section with large deformation. In this way, there is no need to take other deformation measures to reduce the overall hoisting of the steel segment, such as adding reinforcing rings or increasing the stiffness of the rigid frame to increase the overall hoisting. Weight measures, saving materials and speeding up the connection of steel bars.
- the method of this application uses prefabricated positioning tooth plates to tie steel bar segments, which can accurately control the steel bar segments with variable cross-sections, reduce human errors, and improve construction quality.
- the spreader used in the method of this application has a double-layer structure.
- the upper structure is stable and the lower structure is adjustable. It can adapt to the calculated deformation of the cross section of the steel bar section to accurately determine the position and height of the lifting point. The adjustment effectively improves the overall lifting deformation of large-diameter rounded-section steel bar segments.
- Figure 1 is a schematic cross-sectional view of a steel bar segment applicable to the embodiment of the present application.
- Figure 2 is a schematic top structural view of an embodiment of the adjustable disc-shaped spreader of the present application.
- Figure 3 is a schematic side structural view of an embodiment of the adjustable disc-shaped spreader of the present application.
- Figure 4 is a schematic structural diagram of the movable hanger in the embodiment of the present application.
- Figure 5 is a schematic side structural view of Figure 4.
- Figure 6 is a schematic structural diagram of the first movable hanger of the present application.
- Figure 7 is a schematic structural diagram of the second movable hanger of the present application.
- Figure 8 is a physical diagram of the positioning tooth plate of this application.
- Figure 9 is an on-site view of the aerial suspension state of the large-diameter rounded-section steel bar segments of this application being hoisted as a whole.
- the cross-section of a cable tower in a certain bridge project changes from a circular cross-section to a circular cross-section and then back to a circular cross-section from bottom to top, and the overall radial size of the cable tower changes from large to small and then to large, so the different characteristics of the cable tower
- the assembly height corresponds to the size and shape of the different steel bar segments.
- the deformation of the overall hoisting of the rounded cross-section steel bar segments is particularly prominent, which is mainly reflected in the large flexibility of a single steel bar. Due to the large diameter of the spliced steel cage, the overall stiffness of the steel bar segments cannot be significantly improved by forming a three-dimensional structure.
- Reinforcement, and the rounded cross-section steel bar segment has an arc segment curve and an arc-shaped top and bottom plane.
- the arc segment After lifting the steel bar segment as a whole without setting up additional reinforcing structures, the arc segment
- the deformation amplitude of the top and bottom openings increases, which increases the difficulty of docking the upper and lower steel bar segments after the overall hoisting. Therefore, this application designs an overall hoisting method and an adjustable disc-shaped hoist 2 for use in view of the deformation of large-diameter rounded-section steel bar segments. This application is suitable for the overall hoisting process of large-diameter rounded-section steel bar segments.
- the "large diameter” referred to in the embodiment of the present application refers to the situation where the widest point of the steel bar section cross-section reaches more than 9m, and "rounding" means that the steel bar section cross-section includes a circular part.
- the steel segment section includes two arc segments and two straight line segments connecting the end points of different arc segments.
- the steel bar segment 1 shown in Figure 1 is a hollow structure, so the main bars of the steel bar segment 1 are configured as an outer ring structure 1a and an inner ring structure 1b.
- this application provides an adjustable disc-shaped spreader 2, including a main load-bearing rod 21, a connecting rod 22, a distribution beam 23 and a movable hanger 24. details as follows:
- the main load-bearing rods 21 extend radially based on the center point, and each of the main load-bearing rods 21 is distributed in a disc shape on the same plane; the contact rod 22 connects the adjacent main load-bearing rods 21.
- the main load-bearing rod 21 and the contact rod 22 are connected by welding to form a non-detachable stable structure.
- the main load-bearing rods 21 are evenly distributed on the plane, and several contact rods 22 are arranged from the edge of the main load-bearing rod 21 to the center point.
- the radial spacing of each contact rod 22 is the same.
- the adjustable disc-shaped spreader 2 of the present application is provided with eight main load-bearing rods 21, and four contact rods 22 are provided between each two main load-bearing rods 21.
- the connecting rod 22 intersects at the same point on the main load-bearing rod 21.
- the main load-bearing rod 21 and the connecting rod 22 form a uniform spider web-like structure, or a uniform disk-like structure.
- the lifting points directly connected to the lifting equipment, according to the force are distributed on the main load-bearing rod 21, and the spreader 2 of the present application and the lifting equipment are connected through wire ropes (as shown in Figure 9).
- the radial length of the main load-bearing rod 21 needs to cover the largest and widest steel bar segment. Assuming that the rounded cross-section steel bar segment 1 is the largest steel bar segment, the main load-bearing rod 21 needs to cover the largest and widest steel bar segment.
- the length of 21 should be greater than the longest distance from the aforementioned center point (also the center point of steel bar segment 1) to the arc segment of steel bar segment 1.
- the radial spacing of the connecting rods 22 is suitable so that the inner ring structure 1b and the outer ring structure 1a fall under the projection of the spacing respectively, so as to avoid blocking the position where the main bar is provided in the steel bar segment 1 and affecting the subsequent setting of the movable hanger 24.
- the main load-bearing rod 21 and the connecting rod 22 can be made of I-beam steel, and the specific model should be determined according to the load requirements.
- the distribution beam 23 is fixed above the connecting rod 22 and spans at least two of the connecting rods 22 .
- the distribution beam 23 and the contact rod 22 are connected in the form of bolts, that is, the connection between the distribution beam 23 and the contact rod 22 is detachable.
- the distribution beam 23 can be configured as needed, and the distribution beam 23 can be increased where the load is greater. configuration, or reduce the configuration at a place where the load is small, or adjust the specific connection position of the distribution beam 23, which is not limited to the position shown in the figure.
- the length of the distribution beam 23 should cover the top of the inner ring structure 1b and the outer ring structure 1a.
- the distribution beam 23 is horizontal Three continuous connecting rods 22 are spanned.
- the distribution beam 23 is preferably made of I-beam steel, and the specific model should be determined according to the load requirements.
- the movable hanger 24 is sleeved on the main load-bearing rod 21 and/or the distribution beam 23 , and is suspended below the main load-bearing rod 21 .
- the movable hanger 24 includes a steel pipe 241 for casing steel bars, a clamp 244 for clamping a single steel bar, a lifting eye 243 extending from the steel pipe 241, and a sleeve.
- Rope loops 245 provided on the main load-bearing rod 21 and/or the distribution beam 23, and adjustable connectors 246 connecting the rope loops 245 and lifting lugs 243.
- the steel pipe 241 body is provided with positioning holes 2411 for steel bars to penetrate.
- Each steel pipe 241 may have more than one positioning hole 2411, preferably two or three.
- the spacing of the positioning holes 2411 on the same steel pipe 241 is adapted.
- the size of the positioning holes 2411 should also be adapted to the type of steel bars of the structure that needs to be hoisted.
- the steel bars that penetrate the positioning holes 2411 are essentially the main bars of the steel bar segment 1.
- the steel pipe 241 is a square steel pipe, thereby providing a top plane to abut against the taper sleeve clamp to increase the stress-bearing area.
- the taper sleeve clamp includes a taper sleeve and a clip that are nested with each other, and a gasket packed between the taper sleeve and the square steel pipe.
- the embodiment of the present application provides two types of movable hangers.
- the main difference is that the number of steel pipes 241 is different.
- the first movable hanger 24a shown in Figure 6 contains two or more steel pipes 241; Each steel pipe 241 is arranged in parallel according to a preset spacing, and a pair of support steel plates 242 is provided to intersect with the steel pipe 241. At this time, at least a pair of lifting lugs 243 extend from the support steel plate 242, and a pair of lifting lugs 243 can pass through.
- the adjusting connector 246 is connected to a rope ring 245 to realize the installation with the main load-bearing rod 21 or the distribution beam 23 .
- the first movable hanger 24a of this embodiment is provided with three steel pipes 241.
- Each steel pipe 241 is provided with three positioning holes 2411.
- a pair of support steel plates 242 are connected at both ends of the steel pipe 241.
- the support steel plates 242 are provided with two For the lifting lugs 243, the hole axes of the two pairs of lifting lugs 243 are parallel to the axis of the steel pipe 241, so the first movable hanger 24a uses two rope rings 245 correspondingly.
- the first movable hanger 24a simultaneously clamps nine main bars. These nine main bars form a hanging point and are mainly used in the outer ring structure 1a of the steel bar segment 1 in this embodiment.
- the second movable hanger 24b shown in Figure 7 contains one of the steel pipes 241. At this time, a pair of lifting lugs 243 are provided extending from the body of the steel pipe 241. The pair of lifting lugs 243 are connected to each other through an adjustable connector 246. The rope loop 245 can be connected to the main load-bearing rod 21 or the distribution beam 23 .
- the steel pipe 241 of the second movable hanger 24b of this embodiment has three positioning holes 2411.
- a pair of lifting lugs 243 extend from the middle of the steel pipe 241 body.
- the hole axes of the pair of lifting lugs 243 are parallel to the axis of the steel pipe 241.
- the second movable hanger 24b uses a rope ring 245 correspondingly.
- the second movable hanger 24b simultaneously clamps three main bars. These three main bars form a hanging point and are mainly used in the inner ring structure 1b of the steel bar segment 1 in this embodiment.
- the rope ring 245 is directly sleeved on the main load-bearing rod 21 or the distribution beam 23.
- the position of the rope ring 245 is set with a limiting groove 25 to prevent the rope ring 245 from sliding and shifting.
- a pair of steel bar heads can be temporarily fixed on the top surface of the main load-bearing rod 21 or the distribution beam 23 to form the limiting groove 25 .
- the position where the rope loop 245 is set is provided with a protective structure that disperses pressure and buffers.
- One possible implementation is to lay wooden boards 26 on the sides of the main load-bearing rod 21 and the distribution beam 23, and the wooden boards 26 pass through the main load-bearing rod 21 or The tie rod 27 of the distribution beam 23 body is fixed.
- the main load-bearing rod 21 and the distribution beam 23 are made of I-beam, the wooden board 26 and the beam body cannot fit firmly, so the space between the wooden board 26 and the beam body is filled with square wood 28.
- rubber 29 is sleeved on the upper and lower end surfaces of the main load-bearing rod 21 and the distribution beam 23. A 2cm thick rubber skin can be used.
- the wooden board 26 and the rubber 29 fully protect the surfaces of the main load-bearing rod 21 and the distribution beam 23, preventing the tension and friction generated by the rope ring 245 during the hoisting process from adversely affecting the main load-bearing rod 21 and the distribution beam 23.
- the loss of The wooden board 26 and the rubber skin are easy to replace, saving costs.
- the rope loop 245 of the present application can be made of steel wire rope, and the length of the rope loop 245 should be adjusted according to the height of the hanging point.
- the adjustable connector of this application adopts a flower basket screw, a hand chain hoist, or other connecting devices that can adjust the length of the body longitudinally.
- the rope loop 245 can be used with the adjustable connector to easily adjust the height of the lifting point.
- the length of the rope loop 245 can be selected and the installation length of the adjustable connector can be set.
- only adjusting the adjustable connector can realize instant adjustment of the height of the lifting point or the force balance of the lifting point to control the lifting posture of the steel bar segment 1.
- the adjustable disc-shaped spreader 2 of the present application has a double-layer structure: an upper structure composed of a main load-bearing rod 21, a connecting rod 22 and a distribution beam 23, and a lower structure composed of a movable hanger 24.
- the upper structure is stable, and the lower structure is adjustable, which can adapt to the calculated deformation of each cross section of steel segment 1 to accurately adjust the position and height of the lifting point, effectively improving the deformation of the overall lifting of large diameter rounded section steel segments.
- the upper structure is stable, and the lower structure is adjustable, which can adapt to the calculated deformation of each cross section of steel segment 1 to accurately adjust the position and height of the lifting point, effectively improving the deformation of the overall lifting of large diameter rounded section steel segments. Condition.
- adjustable disc-shaped spreader 2 is used to realize the overall hoisting of large-diameter rounded cross-section steel bar segments.
- the specific method is as follows:
- the lashing of steel bar segments is usually arranged at the lashing platform.
- a prefabricated positioning tooth plate (as shown in Figure 8) is placed.
- the positioning tooth plate is CNC cut to conform to each steel bar section. Requirements for the joint between the top and bottom of the section, especially the requirements for the inclination of the main reinforcement when binding.
- the positioning tooth plate defines the spacing and inclination angle at the bottom of each main bar through each positioning hole to accurately match the top of the butt steel segment.
- the steel bar segments that are bound at the binding platform include the rigid skeleton, most of the main bars and the stirrups connecting the main bars. If necessary, some tie bars are also included. The remaining small amount of steel bars are placed on the binding platform. Install in situ after alignment connection.
- the aforementioned adjustable disc-shaped hanger 2 is used to set lifting points on the steel bar segments according to the predicted deformation of the large-diameter rounded cross-section. Specifically, the position of the connecting movable hanger 24 is determined at the steel bar segment.
- the first movable hanger 24a with a larger number of permanently fixed main bars is evenly fixed on the outer ring structure 1a of the steel bar segment, and the second movable hanger 24b with a smaller number of one-time fixed main bars is evenly fixed on the inner ring structure of the steel bar segment. 1b.
- the relative height of each movable hanger 24 needs to be adjusted adaptively, which is mainly determined by the length of the rope loop 245 and the length of the adjustable connector.
- the bottom opening of the current steel bar segment should be docked and connected with the top opening of the bottom steel bar segment, that is, the main bar connection of the upper and lower steel bar segments should be completed.
- the steel bar segments are hoisted in place and first connected to the first main bar 11 of the circular arc segment whose deformation is controlled to be small during hoisting. Then the lifting equipment unloads most of the hoisting weight.
- the unloaded load can be 60% to 85% of the total load, that is, part of the weight of the actual steel segment is transferred from the lifting equipment to the constructed segment.
- the overall hoisting method of large-diameter rounded-section steel bar segments in this application utilizes an adjustable disc-shaped spreader, and rationally utilizes the shape and deformation characteristics of large-diameter rounded-section steel bar segments.
- the deformation is connected first. After connecting the main bars in the smaller arc section, unloading most of the stress on the main hook, let the steel bar sections recover their shape, and then connect the main bars in the straight line section where the deformation is large. In this way, there is no need to take other steps to reduce the steel bar sections.
- Deformation measures for the overall hoisting of the section such as adding reinforcing rings or increasing the stiffness of the rigid frame, are measures to increase the overall hoisting weight, save materials and speed up the connection of steel bars.
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Abstract
A hoisting method for an entire large diameter variable circular cross section steel bar segment (1), where an adjustable disc-shaped lifting tool (2) is utilized, and shape and deformation characteristics of the large-diameter variable circular cross section steel bar segment (1) are sensibly taken into account; first, arced section main steel bars having lower deformation are connected, and after most of the stress of a main lifting hook is unloaded, the form of the steel bar segment (1) is restored, and then connection to main steels bars having greater linear section deformation is performed. By this means, no other measures for reducing deformation when hoisting the entire steel bar segment (1) are necessary, material is saved, and the speed of connecting steel bars is increased.
Description
本申请涉及桥梁建设领域,尤其涉及一种大直径变圆截面钢筋节段钢筋整体吊装方法。This application relates to the field of bridge construction, and in particular to a method for integrally hoisting large-diameter rounded-section steel bar segments.
大直径钢筋节段的吊装需要控制起吊之后钢筋的变形幅度,横截面为中心对称的钢筋节段较容易通过现有技术控制变形程度,但是对于直径较大、且横截面形状为非中心对称的钢筋节段起吊后的变形控制较难,主要由于直径较大、且横截面形状为非中心对称的钢筋节段在整体吊装时的变形特征与变形量与常规情况有所不同,目前已有的钢筋节段整体吊装工艺中没有针对直径9-18m规格大直径变圆(椭圆)截面塔(墩)身节段钢筋整体吊装方法及对应的专用吊具,如果按照常规的施工方式在钢筋节段设置内撑结构或加强圈支撑,由于钢筋节段截面尺寸较大,变形改善效果差,造成钢筋保护层合格率低,且增加了吊装总重量,使得钢筋节段间对接难度大,影响施工效率。The hoisting of large-diameter steel bar segments requires controlling the deformation amplitude of the steel bar after lifting. It is easier to control the deformation degree of steel bar segments with a centrally symmetrical cross-section through existing technology, but for large-diameter steel bar segments with a non-centrally symmetrical cross-sectional shape It is difficult to control the deformation of steel bar segments after lifting, mainly because the deformation characteristics and deformation amount of steel bar segments with larger diameters and non-center symmetrical cross-sectional shapes when hoisted as a whole are different from the conventional situation. Currently, the existing In the overall hoisting process of steel bar segments, there is no overall hoisting method and corresponding special hoisting tools for large diameter rounded (elliptical) cross-section tower (pier) body segments with a diameter of 9-18m. If the steel bar segments are installed according to conventional construction methods, When setting up internal bracing structures or reinforcing ring supports, due to the large cross-section size of the steel bar segments, the deformation improvement effect is poor, resulting in a low pass rate of the steel bar protective layer, and the total hoisting weight is increased, making the connection between steel bar segments difficult and affecting the construction efficiency. .
发明内容Contents of the invention
本申请的目的是,至少部分改善现有技术的不足,提供一种操作简便,效果显著的大直径变圆截面钢筋节段钢筋整体吊装方法。The purpose of this application is to at least partially improve the shortcomings of the existing technology and provide an easy-to-operate and effective method for integrally hoisting large-diameter rounded cross-section steel bar segments.
为达到以上技术目的,本申请采用的技术方案如下:In order to achieve the above technical objectives, the technical solutions adopted in this application are as follows:
一种大直径变圆截面钢筋节段钢筋整体吊装方法,其包括如下步骤:An overall hoisting method for large-diameter rounded-section steel bar segments, which includes the following steps:
按照预设的变圆截面轮廓绑扎钢筋节段;Bind the steel bar segments according to the preset rounded cross-section profile;
根据所述钢筋节段起吊后的变形情况设置吊点和连接对应的吊具;Set lifting points and connect corresponding lifting devices according to the deformation of the steel bar segments after lifting;
利用所述吊具整体吊装所述钢筋节段到对接位置;Use the hoisting device to hoist the steel bar segments as a whole to the docking position;
对接圆弧段处的第一主筋之后,对所述吊具进行第一次卸载;After docking the first main bar at the arc section, unload the spreader for the first time;
对接直线段处的第二主筋之后,撤离所述吊具。After docking the second main reinforcement at the straight section, evacuate the spreader.
优选地,所述按照预设的变圆截面轮廓绑扎钢筋节段,包括:Preferably, the binding of steel bar segments according to a preset rounded cross-sectional profile includes:
根据钢筋节段顶口和底口的对接要求预制定位齿板;Pre-positioning tooth plates according to the docking requirements of the top and bottom openings of the steel bar segments;
利用所述定位齿板绑扎所述钢筋节段;Use the positioning tooth plate to tie the steel bar segments;
其中,所述钢筋节段包括劲性骨架、大部分主筋和连接主筋的箍筋。Wherein, the steel bar segments include a stiff frame, most of the main bars and stirrups connecting the main bars.
进一步地,撤离所述吊具之后,完成剩余钢筋的绑扎。Further, after the spreader is evacuated, the binding of the remaining steel bars is completed.
可选择地,所述吊点适应所述钢筋节段变形情况配置为不共面。Optionally, the hanging points are configured to be non-coplanar to adapt to the deformation of the steel bar segments.
进一步可选择地,所述吊点设置在主筋上。Further optionally, the hanging points are arranged on the main ribs.
一种可能的实施方式中,所述吊具包括共面的上层结构和不共面的下层结构,所述下层结构包括若干悬吊在所述上层结构下方的活动吊架,所述活动吊架与所述吊点一一对应。In a possible implementation, the spreader includes a coplanar upper structure and a non-coplanar lower structure. The lower structure includes a number of movable hangers suspended below the upper structure. The movable hangers correspond to the hanging points.
可选择地,所述活动吊架通过可调节连接件与所述上层结构套设连接,用于调整所述活动吊架的高度和平面位置。Optionally, the movable hanger is connected to the upper structure through an adjustable connecting piece for adjusting the height and plane position of the movable hanger.
进一步地,所述对所述吊具进行第一次卸载,包括:卸载荷载为总荷载的60%~85%。Further, the first unloading of the spreader includes: unloading a load of 60% to 85% of the total load.
与现有技术相比较,本申请具有如下优势:Compared with the existing technology, this application has the following advantages:
(1)本申请的方法,合理利用了大直径变圆截面钢筋节段形状和变形特点,先连接变形较小圆弧段主筋连接后,卸载主吊钩大部分受力之后,让钢筋节段恢复形态,再进行直线段变形较大处主筋连接,通过这种方式,无需另外采取其余减小钢筋节段整体吊装的变形措施,如增加加强圈或加大劲性骨架的刚度等增加整体吊装重量的措施,节约材料且加快钢筋连接速度。(1) The method of this application makes reasonable use of the shape and deformation characteristics of the large-diameter rounded cross-section steel bar segments. First, connect the main bars of the arc segments with smaller deformation, and then unload most of the stress on the main hook, allowing the steel bar segments to Restore the shape, and then connect the main bars at the straight line section with large deformation. In this way, there is no need to take other deformation measures to reduce the overall hoisting of the steel segment, such as adding reinforcing rings or increasing the stiffness of the rigid frame to increase the overall hoisting. Weight measures, saving materials and speeding up the connection of steel bars.
(2)本申请的方法,利用预制的定位齿板绑扎钢筋节段,能够对变截面的钢筋节段进行精确控制,减少人为误差,提高施工质量。(2) The method of this application uses prefabricated positioning tooth plates to tie steel bar segments, which can accurately control the steel bar segments with variable cross-sections, reduce human errors, and improve construction quality.
(3)本申请的方法中所使用的吊具具有双层结构,上层结构稳定,下层结构可调,可适应钢筋节段横截面各处的计算变形量进行吊点位置和吊点高度的精确调整,有效改善了大直径变圆截面钢筋节段整体起吊的变形情况。(3) The spreader used in the method of this application has a double-layer structure. The upper structure is stable and the lower structure is adjustable. It can adapt to the calculated deformation of the cross section of the steel bar section to accurately determine the position and height of the lifting point. The adjustment effectively improves the overall lifting deformation of large-diameter rounded-section steel bar segments.
图1为本申请实施例所适用的钢筋节段截面示意图。Figure 1 is a schematic cross-sectional view of a steel bar segment applicable to the embodiment of the present application.
图2为本申请的可调节的盘状吊具的实施例俯视结构示意图。Figure 2 is a schematic top structural view of an embodiment of the adjustable disc-shaped spreader of the present application.
图3为本申请的可调节的盘状吊具的实施例侧视结构示意图。Figure 3 is a schematic side structural view of an embodiment of the adjustable disc-shaped spreader of the present application.
图4为本申请的实施例中的活动吊架结构示意图。Figure 4 is a schematic structural diagram of the movable hanger in the embodiment of the present application.
图5为图4的侧视结构示意图。Figure 5 is a schematic side structural view of Figure 4.
图6为本申请的第一活动吊架的结构示意图。Figure 6 is a schematic structural diagram of the first movable hanger of the present application.
图7为本申请的第二活动吊架的结构示意图。Figure 7 is a schematic structural diagram of the second movable hanger of the present application.
图8为本申请的定位齿板的实物图。Figure 8 is a physical diagram of the positioning tooth plate of this application.
图9为本申请的大直径变圆截面钢筋节段整体吊装的空中悬吊状态现场图。Figure 9 is an on-site view of the aerial suspension state of the large-diameter rounded-section steel bar segments of this application being hoisted as a whole.
以下结合附图和具体实施方式对本申请作进一步详细描述。The present application will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
某桥梁工程的索塔的截面从下至上由圆截面变化为变圆截面,再变化为圆截面,并且该索塔的径向总体尺寸是由大变小再变大,因此该索塔的不同拼装高度对应不同的钢筋节段的尺寸和形状。其中,变圆截面的钢筋节段整体吊装的变形情况尤其突出,主要体现在单根钢筋柔性大,所拼接形成的钢筋笼由于直径大,钢筋节段的整体刚度难以通过形成立体结构得到明显的加强,并且该变圆截面的钢筋节段存在圆弧段的曲线和圆弧状的顶口底口平面,在不设置额外的加强结构的情况下对钢筋节段整体起吊之后其圆弧段处的顶口和底口的变形幅度增加,增加了整体吊装之后上下钢筋节段的对接难度。因此,本申请针对大直径变圆截面钢筋节段的变形情况,设计了整体吊装方法,以及设计可调节的盘状吊具2进行使用。本申请适用大直径变圆截面钢筋节段的整体吊装工艺。The cross-section of a cable tower in a certain bridge project changes from a circular cross-section to a circular cross-section and then back to a circular cross-section from bottom to top, and the overall radial size of the cable tower changes from large to small and then to large, so the different characteristics of the cable tower The assembly height corresponds to the size and shape of the different steel bar segments. Among them, the deformation of the overall hoisting of the rounded cross-section steel bar segments is particularly prominent, which is mainly reflected in the large flexibility of a single steel bar. Due to the large diameter of the spliced steel cage, the overall stiffness of the steel bar segments cannot be significantly improved by forming a three-dimensional structure. Reinforcement, and the rounded cross-section steel bar segment has an arc segment curve and an arc-shaped top and bottom plane. After lifting the steel bar segment as a whole without setting up additional reinforcing structures, the arc segment The deformation amplitude of the top and bottom openings increases, which increases the difficulty of docking the upper and lower steel bar segments after the overall hoisting. Therefore, this application designs an overall hoisting method and an adjustable disc-shaped hoist 2 for use in view of the deformation of large-diameter rounded-section steel bar segments. This application is suitable for the overall hoisting process of large-diameter rounded-section steel bar segments.
参考图1,本申请实施例所指的“大直径”指钢筋节段截面的最宽处达到9m以上的情况,“变圆”指钢筋节段截面包括圆形的部分,本申请实施例的钢筋节段截面包括两段圆弧段和连接不同的圆弧段端点的两段直线段。如图1所示的钢筋节段1为空心结构,因此该钢筋节段1的主筋配置为外圈结构1a和 内圈结构1b。Referring to Figure 1, the "large diameter" referred to in the embodiment of the present application refers to the situation where the widest point of the steel bar section cross-section reaches more than 9m, and "rounding" means that the steel bar section cross-section includes a circular part. The steel segment section includes two arc segments and two straight line segments connecting the end points of different arc segments. The steel bar segment 1 shown in Figure 1 is a hollow structure, so the main bars of the steel bar segment 1 are configured as an outer ring structure 1a and an inner ring structure 1b.
参考图2和图3,本申请提供了一种可调节的盘状吊具2,包括主承重杆21、联系杆22、分配梁23以及活动吊架24。具体如下:Referring to Figures 2 and 3, this application provides an adjustable disc-shaped spreader 2, including a main load-bearing rod 21, a connecting rod 22, a distribution beam 23 and a movable hanger 24. details as follows:
所述主承重杆21,基于中心点径向延伸,各个所述主承重杆21在同一平面上以盘状形式分布;所述联系杆22,连接所述相邻的主承重杆21。主承重杆21和联系杆22以焊接形式连接形成不可拆卸的稳定结构。优选地,主承重杆21在平面上均匀分布,联系杆22从主承重杆21的边缘向中心点配置若干条,优选地,各条联系杆22的径向间距相同。在一种可能的实施方式中,本申请的可调节的盘状吊具2设置八条主承重杆21,每两条主承重杆21之间设置四条联系杆22,距离中心点相同的相邻的联系杆22在主承重杆21上相交于同一点,主承重杆21和联系杆22形成均匀的蛛网状结构,或者说形成均匀的盘状结构,与起吊设备直接连接的吊点,按照受力平衡的要求分散设置在主承重杆21上,通过钢丝绳连接本申请的吊具2和起吊设备(如图9所示)。适应于前述钢筋节段1的整体吊装,主承重杆21的径向长度需要覆盖到最大最宽的钢筋节段,假设变圆截面的钢筋节段1为尺寸最大的钢筋节段,主承重杆21的长度应当大于从前述中心点(也是钢筋节段1的中心点)到钢筋节段1圆弧段的最长距离。联系杆22的径向间距适宜使得内圈结构1b和外圈结构1a分别落入该间距的投影之下,避免在钢筋节段1设有主筋的位置造成遮挡,影响后续活动吊架24的设置。进一步地,主承重杆21和联系杆22可以选用工字钢进行加工制造,具体的型号应当根据荷载要求确定。The main load-bearing rods 21 extend radially based on the center point, and each of the main load-bearing rods 21 is distributed in a disc shape on the same plane; the contact rod 22 connects the adjacent main load-bearing rods 21. The main load-bearing rod 21 and the contact rod 22 are connected by welding to form a non-detachable stable structure. Preferably, the main load-bearing rods 21 are evenly distributed on the plane, and several contact rods 22 are arranged from the edge of the main load-bearing rod 21 to the center point. Preferably, the radial spacing of each contact rod 22 is the same. In a possible implementation, the adjustable disc-shaped spreader 2 of the present application is provided with eight main load-bearing rods 21, and four contact rods 22 are provided between each two main load-bearing rods 21. The adjacent ones with the same distance from the center point The connecting rod 22 intersects at the same point on the main load-bearing rod 21. The main load-bearing rod 21 and the connecting rod 22 form a uniform spider web-like structure, or a uniform disk-like structure. The lifting points directly connected to the lifting equipment, according to the force The balance requirements are distributed on the main load-bearing rod 21, and the spreader 2 of the present application and the lifting equipment are connected through wire ropes (as shown in Figure 9). To adapt to the overall hoisting of the aforementioned steel bar segment 1, the radial length of the main load-bearing rod 21 needs to cover the largest and widest steel bar segment. Assuming that the rounded cross-section steel bar segment 1 is the largest steel bar segment, the main load-bearing rod 21 needs to cover the largest and widest steel bar segment. The length of 21 should be greater than the longest distance from the aforementioned center point (also the center point of steel bar segment 1) to the arc segment of steel bar segment 1. The radial spacing of the connecting rods 22 is suitable so that the inner ring structure 1b and the outer ring structure 1a fall under the projection of the spacing respectively, so as to avoid blocking the position where the main bar is provided in the steel bar segment 1 and affecting the subsequent setting of the movable hanger 24. . Furthermore, the main load-bearing rod 21 and the connecting rod 22 can be made of I-beam steel, and the specific model should be determined according to the load requirements.
所述分配梁23,固定在所述联系杆22上方,横跨至少两条所述联系杆22。分配梁23与联系杆22之间以螺栓形式进行连接,即分配梁23与联系杆22之间的连接是可拆卸的,使用时,分配梁23可以根据需要进行配置,在荷载较大处增加配置,或者在荷载较小处减少配置,也可以调整分配梁23具体的连接位置,不限于图示的位置。在本实施例中,适应于钢筋节段1所具有的内圈结构1b和外圈结构1a,分配梁23的长度应当覆盖内圈结构1b和外圈结构1a的上方,此时分配梁23横跨连续的三条联系杆22,对应地,支承着分配梁23的联系杆22,特别是支承着套设有活动吊架24的分配梁23的联系杆22,在支承处要进行结构加强,例如是设置加劲板。分配梁23优选选用工字钢进行加工制造,具体型号应当根据荷载要求确定。The distribution beam 23 is fixed above the connecting rod 22 and spans at least two of the connecting rods 22 . The distribution beam 23 and the contact rod 22 are connected in the form of bolts, that is, the connection between the distribution beam 23 and the contact rod 22 is detachable. When in use, the distribution beam 23 can be configured as needed, and the distribution beam 23 can be increased where the load is greater. configuration, or reduce the configuration at a place where the load is small, or adjust the specific connection position of the distribution beam 23, which is not limited to the position shown in the figure. In this embodiment, adapted to the inner ring structure 1b and outer ring structure 1a of the steel bar segment 1, the length of the distribution beam 23 should cover the top of the inner ring structure 1b and the outer ring structure 1a. At this time, the distribution beam 23 is horizontal Three continuous connecting rods 22 are spanned. Correspondingly, the connecting rods 22 that support the distribution beam 23, especially the connecting rods 22 that support the distribution beam 23 with a movable hanger 24, need to be structurally reinforced at the supporting locations, such as It is to set up the stiffening plate. The distribution beam 23 is preferably made of I-beam steel, and the specific model should be determined according to the load requirements.
所述活动吊架24,套设在所述主承重杆21和/或所述分配梁23上,并悬吊于所述主承重杆21下方。具体地,如图4~7所示,所述活动吊架24包括用于套设钢筋的钢管241、用于夹持单条钢筋的夹具244、从所述钢管241延伸出的吊耳243、套设在主承重杆21和/或所述分配梁23上的绳环245,以及连接所述绳环245和吊耳243的可调连接件246。The movable hanger 24 is sleeved on the main load-bearing rod 21 and/or the distribution beam 23 , and is suspended below the main load-bearing rod 21 . Specifically, as shown in Figures 4 to 7, the movable hanger 24 includes a steel pipe 241 for casing steel bars, a clamp 244 for clamping a single steel bar, a lifting eye 243 extending from the steel pipe 241, and a sleeve. Rope loops 245 provided on the main load-bearing rod 21 and/or the distribution beam 23, and adjustable connectors 246 connecting the rope loops 245 and lifting lugs 243.
所述钢管241本体开设供钢筋贯穿的定位孔2411,每条钢管241所开设的定位孔2411可以多于一个,优选是两个或三个,同一条钢管241上的定位孔2411的间距适配于需要吊装的结构的钢筋间距,该定位孔2411的尺寸也应当适配于需要吊装的结构的钢筋型号。在本申请的吊具中,贯穿所述定位孔2411 的钢筋实质上是钢筋节段1的主筋,主筋贯穿钢管241之后,利用锥套夹具夹持每条主筋的顶端,使得锥套夹具抵靠钢管241从而成为一个钢筋节段1的吊点。优选地,所述钢管241采用方钢管,由此提供了顶部的平面与锥套夹具相抵靠,以增加受力面积。所述锥套夹具包括相互套设的锥套和夹片,以及填塞在锥套和方钢管之间的垫片。The steel pipe 241 body is provided with positioning holes 2411 for steel bars to penetrate. Each steel pipe 241 may have more than one positioning hole 2411, preferably two or three. The spacing of the positioning holes 2411 on the same steel pipe 241 is adapted. Regarding the spacing of the steel bars of the structure that needs to be hoisted, the size of the positioning holes 2411 should also be adapted to the type of steel bars of the structure that needs to be hoisted. In the spreader of the present application, the steel bars that penetrate the positioning holes 2411 are essentially the main bars of the steel bar segment 1. After the main bars penetrate the steel pipe 241, the top of each main bar is clamped by a drogue clamp, so that the drogue clamp is against The steel pipe 241 thus becomes a lifting point for the steel bar segment 1 . Preferably, the steel pipe 241 is a square steel pipe, thereby providing a top plane to abut against the taper sleeve clamp to increase the stress-bearing area. The taper sleeve clamp includes a taper sleeve and a clip that are nested with each other, and a gasket packed between the taper sleeve and the square steel pipe.
本申请的实施例提供了两种活动吊架,主要区别在于所组成的钢管241数量不同,如图6所示的第一活动吊架24a,含有两个或两个以上的所述钢管241;各个钢管241按照预设的间距平行排列,设置一对支垫钢板242与所述钢管241相交连接,此时,至少一对吊耳243从支垫钢板242延伸出,一对吊耳243通过可调连接件246连接一个绳环245,实现与主承重杆21或分配梁23的套设。本实施例的第一活动吊架24a设置了三个钢管241,每个钢管241开设三个定位孔2411,一对支垫钢板242连接在钢管241的两端,该支垫钢板242设置了两对吊耳243,两对吊耳243的孔轴线与钢管241的轴线平行,因此该第一活动吊架24a对应使用了两个绳环245。该第一活动吊架24a同时夹持了九条主筋,这九条主筋组成一个吊点,主要应用于本实施例的钢筋节段1的外圈结构1a中。The embodiment of the present application provides two types of movable hangers. The main difference is that the number of steel pipes 241 is different. The first movable hanger 24a shown in Figure 6 contains two or more steel pipes 241; Each steel pipe 241 is arranged in parallel according to a preset spacing, and a pair of support steel plates 242 is provided to intersect with the steel pipe 241. At this time, at least a pair of lifting lugs 243 extend from the support steel plate 242, and a pair of lifting lugs 243 can pass through. The adjusting connector 246 is connected to a rope ring 245 to realize the installation with the main load-bearing rod 21 or the distribution beam 23 . The first movable hanger 24a of this embodiment is provided with three steel pipes 241. Each steel pipe 241 is provided with three positioning holes 2411. A pair of support steel plates 242 are connected at both ends of the steel pipe 241. The support steel plates 242 are provided with two For the lifting lugs 243, the hole axes of the two pairs of lifting lugs 243 are parallel to the axis of the steel pipe 241, so the first movable hanger 24a uses two rope rings 245 correspondingly. The first movable hanger 24a simultaneously clamps nine main bars. These nine main bars form a hanging point and are mainly used in the outer ring structure 1a of the steel bar segment 1 in this embodiment.
如图7所示的第二活动吊架24b,含有一个所述钢管241,此时,设置一对吊耳243从钢管241本体延伸出,该一对吊耳243通过可调连接件246连接一个绳环245,实现与主承重杆21或分配梁23的套设。本实施例的第二活动吊架24b的钢管241开设了三个定位孔2411,一对吊耳243从钢管241本体的中部延伸出,该一对吊耳243的孔轴线与钢管241的轴线平行,因此该第二活动吊架24b对应使用了一个绳环245。该第二活动吊架24b同时夹持了三条主筋,这三条主筋组成一个吊点,主要应用于本实施例的钢筋节段1的内圈结构1b中。The second movable hanger 24b shown in Figure 7 contains one of the steel pipes 241. At this time, a pair of lifting lugs 243 are provided extending from the body of the steel pipe 241. The pair of lifting lugs 243 are connected to each other through an adjustable connector 246. The rope loop 245 can be connected to the main load-bearing rod 21 or the distribution beam 23 . The steel pipe 241 of the second movable hanger 24b of this embodiment has three positioning holes 2411. A pair of lifting lugs 243 extend from the middle of the steel pipe 241 body. The hole axes of the pair of lifting lugs 243 are parallel to the axis of the steel pipe 241. , so the second movable hanger 24b uses a rope ring 245 correspondingly. The second movable hanger 24b simultaneously clamps three main bars. These three main bars form a hanging point and are mainly used in the inner ring structure 1b of the steel bar segment 1 in this embodiment.
如图4和图5所示,所述绳环245直接套设在主承重杆21或分配梁23上,绳环245的套设位置设置限位槽25,防止绳环245发生滑动移位,可选择地,可以在主承重杆21或分配梁23的顶面临时固定一对钢筋头形成所述限位槽25。进一步地,绳环245的套设位置设置分散压力和缓冲的保护结构,一种可能的实施方式,在主承重杆21和分配梁23的侧面铺设木板26,木板26通过贯穿主承重杆21或分配梁23本体的拉杆27进行固定,当主承重杆21和分配梁23采用工字钢制造时,木板26和梁体不能稳固贴合,由此在木板26和梁体之间的空间填塞方木28,以实现对木板26的支持。进一步优选地,在主承重杆21和分配梁23的上下端面套设橡胶29,可以选用2cm厚的橡胶皮。木板26和橡胶29全方位保护了主承重杆21和分配梁23的表面,防止绳环245在吊装过程产生的拉力和摩擦力对主承重杆21和分配梁23造成不利影响,另外,损耗的木板26和橡胶皮易于更换,节约成本。As shown in Figures 4 and 5, the rope ring 245 is directly sleeved on the main load-bearing rod 21 or the distribution beam 23. The position of the rope ring 245 is set with a limiting groove 25 to prevent the rope ring 245 from sliding and shifting. Alternatively, a pair of steel bar heads can be temporarily fixed on the top surface of the main load-bearing rod 21 or the distribution beam 23 to form the limiting groove 25 . Further, the position where the rope loop 245 is set is provided with a protective structure that disperses pressure and buffers. One possible implementation is to lay wooden boards 26 on the sides of the main load-bearing rod 21 and the distribution beam 23, and the wooden boards 26 pass through the main load-bearing rod 21 or The tie rod 27 of the distribution beam 23 body is fixed. When the main load-bearing rod 21 and the distribution beam 23 are made of I-beam, the wooden board 26 and the beam body cannot fit firmly, so the space between the wooden board 26 and the beam body is filled with square wood 28. To achieve support for plank 26. Further preferably, rubber 29 is sleeved on the upper and lower end surfaces of the main load-bearing rod 21 and the distribution beam 23. A 2cm thick rubber skin can be used. The wooden board 26 and the rubber 29 fully protect the surfaces of the main load-bearing rod 21 and the distribution beam 23, preventing the tension and friction generated by the rope ring 245 during the hoisting process from adversely affecting the main load-bearing rod 21 and the distribution beam 23. In addition, the loss of The wooden board 26 and the rubber skin are easy to replace, saving costs.
本申请的绳环245可以使用钢丝绳制作,绳环245的长度应当根据吊点的设置高度进行调整。本申请的可调节连接件采用花篮螺杆或手拉葫芦,或者其他可以纵向调节本体长度的连接装置。绳环245配合可调节连接件可以方便调 整吊点的高度,在钢筋节段1起吊之前,可以选定绳环245的长度和设定可调节连接件的安装长度,在钢筋节段1起吊在空中之后和就位对接之时,仅调整可调节连接件可以实现对吊点高度或吊点的力平衡的即时调整,以用于控制钢筋节段1的吊装姿态。The rope loop 245 of the present application can be made of steel wire rope, and the length of the rope loop 245 should be adjusted according to the height of the hanging point. The adjustable connector of this application adopts a flower basket screw, a hand chain hoist, or other connecting devices that can adjust the length of the body longitudinally. The rope loop 245 can be used with the adjustable connector to easily adjust the height of the lifting point. Before lifting the steel bar segment 1, the length of the rope loop 245 can be selected and the installation length of the adjustable connector can be set. When the steel bar segment 1 is lifted, After being in the air and when docking in place, only adjusting the adjustable connector can realize instant adjustment of the height of the lifting point or the force balance of the lifting point to control the lifting posture of the steel bar segment 1.
由此可知,本申请的可调节的盘状吊具2具有双层结构:由主承重杆21、联系杆22和分配梁23组成的上层结构,以及由活动吊架24组成的下层结构。上层结构稳定,下层结构可调,可适应钢筋节段1横截面各处的计算变形量进行吊点位置和吊点高度的精确调整,有效改善了大直径变圆截面钢筋节段整体起吊的变形情况。It can be seen from this that the adjustable disc-shaped spreader 2 of the present application has a double-layer structure: an upper structure composed of a main load-bearing rod 21, a connecting rod 22 and a distribution beam 23, and a lower structure composed of a movable hanger 24. The upper structure is stable, and the lower structure is adjustable, which can adapt to the calculated deformation of each cross section of steel segment 1 to accurately adjust the position and height of the lifting point, effectively improving the deformation of the overall lifting of large diameter rounded section steel segments. Condition.
进一步地,利用所述可调节的盘状吊具2实现大直径变圆截面钢筋节段钢筋整体吊装,具体方法如下:Further, the adjustable disc-shaped spreader 2 is used to realize the overall hoisting of large-diameter rounded cross-section steel bar segments. The specific method is as follows:
S1,按照预设的变圆截面轮廓绑扎钢筋节段。S1, tie the steel bar segments according to the preset rounded cross-section profile.
钢筋节段的绑扎通常配置于绑扎平台处,绑扎平台的钢筋节段底口定位处,放置预制的定位齿板(如图8所示),该定位齿板采用数控切割,以符合各个钢筋节段顶口和底口的对接要求,特别是绑扎时主筋的倾斜度要求。该定位齿板通过各个定位孔限定每条主筋底口处的间距和倾斜角度,以精确匹配对接钢筋节段的顶口。利用所述定位齿板绑扎所述钢筋节段,在绑扎平台处完成绑扎的钢筋节段包括劲性骨架、大部分主筋和连接主筋的箍筋,必要时还包括部分拉筋,剩余少量钢筋在对位连接之后进行原位安装。The lashing of steel bar segments is usually arranged at the lashing platform. At the bottom position of the steel bar segment of the lashing platform, a prefabricated positioning tooth plate (as shown in Figure 8) is placed. The positioning tooth plate is CNC cut to conform to each steel bar section. Requirements for the joint between the top and bottom of the section, especially the requirements for the inclination of the main reinforcement when binding. The positioning tooth plate defines the spacing and inclination angle at the bottom of each main bar through each positioning hole to accurately match the top of the butt steel segment. Use the positioning tooth plate to bind the steel bar segments. The steel bar segments that are bound at the binding platform include the rigid skeleton, most of the main bars and the stirrups connecting the main bars. If necessary, some tie bars are also included. The remaining small amount of steel bars are placed on the binding platform. Install in situ after alignment connection.
S2,根据所述钢筋节段起吊后的变形情况设置吊点和连接对应的吊具。S2: Set the lifting point and connect the corresponding lifting device according to the deformation of the steel bar segment after lifting.
本实施例的大直径变圆截面钢筋节段,通过计算可知按照常规方式起吊,其自重会导致其圆弧段的第一主筋11变形量增加,且变形情况也与常规情况有所不同,因此需要增加圆弧段的吊装稳固度,控制起吊之后的变形量,其中一种控制方式是增加吊点,可选择的另一种控制方式是增加单个吊点的提吊面积。另外针对本申请实施例的主筋密集的外圈结构1a,也需要设置更密集的拉力以控制变形量。因此,利用前述的可调节的盘状吊具2,针对大直径变圆截面的预测的变形情况对钢筋节段设置吊点,具体是在钢筋节段确定连接活动吊架24的位置,利用一次性固定主筋数量较多的第一活动吊架24a均匀固定在钢筋节段的外圈结构1a,利用一次性固定主筋数量较少的第二活动吊架24b均匀固定在钢筋节段的内圈结构1b,各个活动吊架24的相对高度需进行适应性调整,主要通过绳环245的长度和可调节连接件的长度确定,因此在大部分情况下所有吊点不共面。然而,本领域技术人员应当理解,利用本申请的可调节的盘状吊具2起吊圆形截面(或其他中心对称形状截面)的钢筋节段时,应当按照吊装要求设置吊点,此时的各个吊点可以是共面的。Calculation shows that when the large-diameter rounded cross-section steel bar segment of this embodiment is lifted in a conventional manner, its own weight will cause an increase in the deformation of the first main bar 11 of the circular arc segment, and the deformation situation is also different from the conventional situation. Therefore, It is necessary to increase the lifting stability of the arc segment and control the deformation after lifting. One of the control methods is to increase the lifting points. Another optional control method is to increase the lifting area of a single lifting point. In addition, for the outer ring structure 1a with dense main ribs in the embodiment of the present application, it is also necessary to set a denser tensile force to control the amount of deformation. Therefore, the aforementioned adjustable disc-shaped hanger 2 is used to set lifting points on the steel bar segments according to the predicted deformation of the large-diameter rounded cross-section. Specifically, the position of the connecting movable hanger 24 is determined at the steel bar segment. The first movable hanger 24a with a larger number of permanently fixed main bars is evenly fixed on the outer ring structure 1a of the steel bar segment, and the second movable hanger 24b with a smaller number of one-time fixed main bars is evenly fixed on the inner ring structure of the steel bar segment. 1b. The relative height of each movable hanger 24 needs to be adjusted adaptively, which is mainly determined by the length of the rope loop 245 and the length of the adjustable connector. Therefore, in most cases, all hanging points are not coplanar. However, those skilled in the art should understand that when using the adjustable disc-shaped spreader 2 of the present application to lift steel bar segments with circular cross-sections (or other centrally symmetrical cross-sections), the lifting points should be set according to the lifting requirements. At this time, The individual lifting points can be coplanar.
S3,利用所述吊具整体吊装所述钢筋节段到对接位置;S3, use the hoisting device to hoist the steel bar segments as a whole to the docking position;
钢筋节段整体起吊前进行空中吊装姿态调平,即将钢筋节段提离绑扎平台约10cm高度,观测钢筋节段倾斜度,此时利用可调节连接件进行调平,具体是可以采用花篮螺杆配合手拉葫芦将钢筋节段调平。初步调平完毕继续提升钢筋节段,采用逐步提升和平移的方式将钢筋节段提升到对接位置的上方,以进 行对位连接的准备。实际上该钢筋节段在空中时,并不能保证完全不变形,但是后续可以利用其可控的变形情况完成对接。Before hoisting the steel bar segment as a whole, perform aerial lifting posture leveling. That is, lift the steel bar segment about 10cm away from the binding platform and observe the inclination of the steel bar segment. At this time, use adjustable connectors for leveling. Specifically, you can use a flower basket screw to match A hand chain hoist levels the rebar segments. After the initial leveling is completed, continue to lift the steel bar segments, and use gradual lifting and translation to lift the steel bar segments above the docking position to prepare for the alignment connection. In fact, the steel bar segment is not guaranteed to be completely deformed when it is in the air, but its controllable deformation can be used to complete the docking later.
S4,对接圆弧段处的第一主筋11之后,对所述吊具进行第一次卸载;对接直线段处的第二主筋12之后,撤离所述吊具。S4, after docking the first main reinforcement 11 at the arc section, unload the spreader for the first time; after docking the second main reinforcement 12 at the straight section, evacuate the spreader.
对接时,应当将当前钢筋节段的底口与底节钢筋节段的顶口进行对接连接,即完成上、下钢筋节段主筋连接。大直径变圆截面钢筋节段安装时,钢筋节段吊装就位后先连接吊装时被控制变形幅度较小的圆弧段第一主筋11,然后起吊设备卸载大部分吊重,卸载荷载可以为总荷载的60%~85%,即实际钢筋节段的部分重量由起吊设备转移至已施工节段上,钢筋节段的支撑状态改变后,其整体形态恢复至更为接近实际连接状态,即吊装时被控制变形幅度较大的直线段处的第二主筋12由内倾或外张变形减小恢复至拼装状态,从而方便上、下钢筋节段连接。对接直线段处的第二主筋之后,撤离所述吊具。撤离所述吊具之后,完成该钢筋节段剩余钢筋的绑扎,由此完成钢筋节段的整体吊装工序。When docking, the bottom opening of the current steel bar segment should be docked and connected with the top opening of the bottom steel bar segment, that is, the main bar connection of the upper and lower steel bar segments should be completed. When installing large-diameter circular cross-section steel bar segments, the steel bar segments are hoisted in place and first connected to the first main bar 11 of the circular arc segment whose deformation is controlled to be small during hoisting. Then the lifting equipment unloads most of the hoisting weight. The unloaded load can be 60% to 85% of the total load, that is, part of the weight of the actual steel segment is transferred from the lifting equipment to the constructed segment. After the support state of the steel segment changes, its overall shape returns to a state closer to the actual connection, that is, The second main bar 12 at the straight line segment whose deformation is controlled to be large during hoisting is reduced from inward or outward deformation and returned to the assembled state, thereby facilitating the connection of the upper and lower steel bar segments. After docking the second main reinforcement at the straight section, evacuate the spreader. After the spreader is evacuated, the binding of the remaining steel bars of the steel bar segment is completed, thereby completing the overall hoisting process of the steel bar segment.
综上所述,本申请大直径变圆截面钢筋节段钢筋整体吊装方法,利用了可调节的盘状吊具,并且合理利用了大直径变圆截面钢筋节段形状和变形特点,先连接变形较小圆弧段主筋连接后,卸载主吊钩大部分受力之后,让钢筋节段恢复形态,再进行直线段变形较大处主筋连接,通过这种方式,无需另外采取其余减小钢筋节段整体吊装的变形措施,如增加加强圈或加大劲性骨架的刚度等增加整体吊装重量的措施,节约材料且加快钢筋连接速度。In summary, the overall hoisting method of large-diameter rounded-section steel bar segments in this application utilizes an adjustable disc-shaped spreader, and rationally utilizes the shape and deformation characteristics of large-diameter rounded-section steel bar segments. The deformation is connected first. After connecting the main bars in the smaller arc section, unloading most of the stress on the main hook, let the steel bar sections recover their shape, and then connect the main bars in the straight line section where the deformation is large. In this way, there is no need to take other steps to reduce the steel bar sections. Deformation measures for the overall hoisting of the section, such as adding reinforcing rings or increasing the stiffness of the rigid frame, are measures to increase the overall hoisting weight, save materials and speed up the connection of steel bars.
上述实施例为本申请较佳的实施方式,但并不仅仅受上述实施例的限制,其他的任何未背离本申请的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,均包含在本申请的保护范围之内。The above embodiments are preferred implementation modes of the present application, but they are not limited only by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present application shall be made. Equivalent replacement methods are all included in the protection scope of this application.
Claims (8)
- 一种大直径变圆截面钢筋节段钢筋整体吊装方法,其特征在于,其包括如下步骤:A method for integrally hoisting large-diameter rounded-section steel bar segments, which is characterized in that it includes the following steps:按照预设的变圆截面轮廓绑扎钢筋节段;Bind the steel bar segments according to the preset rounded cross-section profile;根据所述钢筋节段起吊后的变形情况设置吊点和连接对应的吊具;Set lifting points and connect corresponding lifting devices according to the deformation of the steel bar segments after lifting;利用所述吊具整体吊装所述钢筋节段到对接位置;Use the hoisting device to hoist the steel bar segments as a whole to the docking position;对接圆弧段处的第一主筋之后,对所述吊具进行第一次卸载;After docking the first main bar at the arc section, unload the spreader for the first time;对接直线段处的第二主筋之后,撤离所述吊具。After docking the second main reinforcement at the straight section, evacuate the spreader.
- 如权利要求1所述的方法,其特征在于,所述按照预设的变圆截面轮廓绑扎钢筋节段,包括:The method of claim 1, wherein tying steel bar segments according to a preset rounded cross-sectional profile includes:根据钢筋节段顶口和底口的对接要求预制定位齿板;Pre-positioning tooth plates according to the docking requirements of the top and bottom openings of the steel bar segments;利用所述定位齿板绑扎所述钢筋节段;Use the positioning tooth plate to tie the steel bar segments;其中,所述钢筋节段包括劲性骨架、大部分主筋和连接主筋的箍筋。Wherein, the steel bar segments include a stiff frame, most of the main bars and stirrups connecting the main bars.
- 如权利要求2所述的方法,其特征在于,撤离所述吊具之后,完成剩余钢筋的绑扎。The method according to claim 2, characterized in that after the spreader is evacuated, the binding of remaining steel bars is completed.
- 如权利要求1所述的方法,其特征在于,所述吊点适应所述钢筋节段变形情况配置为不共面。The method according to claim 1, characterized in that the hanging points are arranged non-coplanar to adapt to the deformation of the steel bar segments.
- 如权利要求4所述的方法,其特征在于,所述吊点设置在主筋上。The method according to claim 4, characterized in that the hanging points are arranged on main bars.
- 如权利要求4所述的方法,其特征在于,所述吊具包括共面的上层结构和不共面的下层结构,所述下层结构包括若干悬吊在所述上层结构下方的活动吊架,所述活动吊架与所述吊点一一对应。The method of claim 4, wherein the spreader includes a coplanar upper structure and a non-coplanar lower structure, and the lower structure includes a number of movable hangers suspended below the upper structure, The movable hanger corresponds to the hanging point one-to-one.
- 如权利要求6所述的方法,其特征在于,所述活动吊架通过可调节连接件与所述上层结构套设连接,用于调整所述活动吊架的高度和平面位置。The method according to claim 6, wherein the movable hanger is connected to the upper structure through an adjustable connector for adjusting the height and plane position of the movable hanger.
- 如权利要求1所述的方法,其特征在于,所述对所述吊具进行第一次卸载,包括:卸载荷载为总荷载的60%~85%。The method of claim 1, wherein unloading the spreader for the first time includes: unloading 60% to 85% of the total load.
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JP2004204545A (en) * | 2002-12-25 | 2004-07-22 | Nippon Steel Corp | Segment ring structure with different girder height of segment in segment ring |
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CN115215198A (en) * | 2022-07-29 | 2022-10-21 | 中交路桥建设有限公司 | Adjustable disc-shaped lifting appliance |
CN115215199A (en) * | 2022-07-29 | 2022-10-21 | 中交路桥建设有限公司 | Integral hoisting method for large-diameter variable-circular-section steel bar section steel bars |
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JP2004204545A (en) * | 2002-12-25 | 2004-07-22 | Nippon Steel Corp | Segment ring structure with different girder height of segment in segment ring |
CN105220619A (en) * | 2015-10-12 | 2016-01-06 | 中铁城建集团第二工程有限公司 | A kind of method of quick manufacture two-wire nose circle solid pier |
CN211846859U (en) * | 2019-12-31 | 2020-11-03 | 中交第三航务工程局有限公司江苏分公司 | Integral binding and hoisting device for cylindrical reinforcement cage |
CN113863286A (en) * | 2021-10-14 | 2021-12-31 | 中铁大桥局第七工程有限公司 | Installation device of variable cross-section major diameter overlength steel reinforcement cage |
CN115215198A (en) * | 2022-07-29 | 2022-10-21 | 中交路桥建设有限公司 | Adjustable disc-shaped lifting appliance |
CN115215199A (en) * | 2022-07-29 | 2022-10-21 | 中交路桥建设有限公司 | Integral hoisting method for large-diameter variable-circular-section steel bar section steel bars |
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