Lifting appliance for large-scale GRP (glass reinforced plastic) pipeline

Abstract

The utility model relates to the technical field of large-scale GRP (glass reinforced plastic) pipeline hoisting, in particular to a hoisting tool for a large-scale GRP pipeline, which comprises a main beam, a lifting lug is arranged at the top of the main beam, at least two hoisting points are arranged at the bottom of the main beam, the distance between two adjacent hoisting points is 3.5-4.5 m, stiffening ribs are arranged at the positions of the main beam corresponding to the hoisting points, and the stiffening ribs are connected with the main beam. The thickness of each stiffening rib ranges from 14 mm to 16 mm. The lifting appliance is specially designed for the large-diameter GRP pipeline, the characteristics of the size, the weight and the brittleness of the large pipeline are fully considered, a more appropriate lifting scheme can be provided for the pipeline, and the problem that the large pipeline is prone to being damaged when traditional lifting equipment faces the large pipeline is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to large -scale GRP pipeline hoisting technology field especially relates to a hoist for large -scale GRP pipeline. BACKGROUND

[0002] GRP pipeline (glass steel pipe is also called polyester glass steel pipe) has excellent corrosion resistance, light weight, long service life and other advantages, and is widely used in petroleum, chemical industry, water treatment and other fields.

[0003] Large -scale GRP pipeline (diameter is greater than or equal to 3000mm, self -weight is greater than or equal to 20 tons) needs to use caterpillar to hoist when moving in the field, and the existing hoist for pipeline hoisting mostly uses steel wire rope to wind around the pipeline, uses the crane to be directly connected with the steel wire rope, but large -scale GRP pipeline has the characteristics of large size, heavy weight, long length, certain brittleness, and the conventional hoisting method is difficult to guarantee the balance of GRP pipeline during hoisting, and the pipe wall of GRP pipeline is easily damaged, causes the pipe wall to break, crack, bend or pipe wall delamination, and the protection of large -scale GRP pipeline is poor, and the hoisting success rate is low, and the construction cost is increased inappropriately, and the damaged GRP pipeline needs to be replaced or repaired in the factory, and the construction efficiency is low. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the conventional pipeline hoist hoist large -scale GRP pipeline and easily causing the damage of GRP pipeline, increases the insufficient of construction cost, provides a hoist for large -scale GRP pipeline, ensures the stable aerial posture when hoisting the pipeline, makes the whole construction process more safe and reliable.

[0005] In the first aspect, the utility model provides a hoist for large -scale GRP pipeline, including the main girder, the top of main girder is provided with the lifting lug, the bottom of main girder is provided with at least two lifting points, and the spacing of adjacent two lifting points is 3.5m-4.5m, and the position corresponding to main girder and lifting point is provided with stiffening rib, and the thickness of stiffening rib is 14mm-16mm.

[0006] The utility model provides a hoist of large -scale GRP pipeline, the main beam plays the role of the balanced beam, and the lifting point under the main beam can be connected with the GRP pipeline through the nylon sling, can effectively prevent the unstable phenomenon such as pipeline tilting, shaking when hoisting, ensure the stability and safety of hoisting, and the design of multiple lifting points can evenly distribute the stress in the hoisting process, avoid stress concentration, thereby significantly reduce the pipe wall damage, crack or bending phenomenon caused by local excessive stress in the hoisting process of GRP pipeline. The design of multiple lifting points greatly improves the stability of the hoisting process, ensures that hoisting is more stable and safe, and the main beam is provided with stiffening ribs at the position corresponding to the lifting point, which enhances the overall structural strength of the hoist. This stiffening design can effectively bear the gravity of large -scale GRP pipeline and the dynamic load during hoisting, prevent the deformation or failure of the hoist due to overload, and further improve the safety and reliability of hoisting, the hoist is specially designed for large -diameter GRP pipeline, fully considers the size, weight and brittle characteristics of large -scale pipeline, can provide more suitable hoisting scheme for such pipeline, and solve the damage problem that the traditional hoisting equipment is prone to when facing large -scale pipeline.

[0007] Preferably, the number of said lifting lugs is one, said lifting lug is located in the middle of said main beam, and the side wall of said lifting lug is provided with at least four lug reinforcing plates with said main beam, and the thickness of said lug reinforcing plates is 14-16mm.

[0008] With this structure, the lifting lug is located in the middle of the main beam, so that the overall hoist can realize symmetrical distribution of stress during hoisting. By setting a single lifting lug in the middle of the main beam, the left and right sides of the main beam can balance the weight of the pipeline, reducing the problems of tilting, shaking and other problems caused by uneven stress, ensuring the stability and safety of the hoisting process. Especially when hoisting longer and heavier GRP pipelines, this design of a single lifting lug in the middle helps to optimize the hoisting center of gravity and prevent accidental tipping or imbalance; by providing at least four lug reinforcing plates with a thickness of 14-16mm, the strength of the lug connection with the main beam is effectively enhanced. The lug bears a huge tension during hoisting, especially during the hoisting of large GRP pipelines, and the concentration of stress points may cause stress concentration at the lug connection with the main beam. The reinforcing plate can effectively disperse the stress at the lug, reduce the risk of fatigue and damage of the local structure, and prolong the service life of the hoist.

[0009] Preferably, at least two auxiliary ears are further provided on the top of the main beam, and the auxiliary ears are symmetrically arranged on both sides of the lifting lug.

[0010] By symmetrically arranging the auxiliary ears on both sides of the main beam, single lifting lug or multiple lifting lugs can be flexibly selected for hoisting according to different working conditions and site requirements. When the hoisting object is particularly heavy or requires higher stability, the auxiliary ear can be used together with the main lifting lug to realize multi-point hoisting, further disperse the load pressure, and ensure that the hoisting of the pipeline is more stable.

[0011] Preferably, the number of lifting lugs is two, the distance between adjacent two lifting lugs is 7m-9m, the number of lifting points is four, the distance between adjacent two lifting points is 3.5m-4.5m, the lifting lugs are uniformly distributed on the main beam, and the lifting points are uniformly distributed on the main beam.

[0012] With this structural arrangement, by uniformly distributing two lifting lugs and four lifting points on the main beam, the stress of the entire lifting device is more uniform, reducing the risk of a single lifting lug or lifting point bearing excessive load. When hoisting a large GRP pipeline, the distribution of lifting lugs and lifting points can reasonably disperse the weight of the pipeline, reduce the possibility of excessive local stress, and ensure the structural stability of the lifting device and the pipeline during hoisting. Especially when the GRP pipeline is long and heavy, the distribution of multiple lifting lugs and lifting points can effectively control the bending moment during hoisting, reducing the risk of deformation and damage to the pipeline.

[0013] Preferably, it further comprises a reinforcing plate, the reinforcing plate is welded with the main beam, and the reinforcing plate is symmetrically distributed on both sides of the main beam along the width direction of the main beam.

[0014] With this structural arrangement, the design of the reinforcing plate can significantly enhance the bending and torsional resistance of the main beam by being symmetrically distributed on both sides of the main beam. When hoisting a large GRP pipeline, the main beam will bear bending stress and torsional moment from different directions. The addition of the reinforcing plate effectively improves the overall stiffness of the main beam, reducing the degree of deformation of the main beam under stress, ensuring the structural strength and stability of the lifting device under high load. This makes the lifting device less likely to produce permanent deformation during long-term use, prolonging the service life of the lifting device.

[0015] Preferably, the length of the reinforcing plate is 7m-9m, and the thickness of the reinforcing plate is 14mm-16mm.

[0016] With this structural arrangement, the longer length of the reinforcing plate covers most of the area of the main beam, effectively enhancing the stability of the overall structure. The thickness of the lengthened plate significantly improves the bending and torsional resistance of the reinforcing plate. The reinforcing plate designed in this way can better withstand the bending moment and torsional moment generated during hoisting, reducing the risk of deformation caused by uneven stress.

[0017] Preferably, the reinforcing plate is located between adjacent two lifting lugs.

[0018] With this structural arrangement, deformation caused by local stress can be effectively resisted, the overall stress balance of the main beam is improved, and the risk of deformation of the main beam during loading is reduced.

[0019] Preferably, a nylon sling is further included, two ends of the nylon sling are connected with the same lifting point, and the width of the nylon sling is 40cm-60cm.

[0020] With the structural arrangement, the width of the nylon sling is wider, which can provide a larger contact area, thereby significantly enhancing the carrying capacity.

[0021] Preferably, a lifting ring is further included, the lifting ring is connected with the lifting lug through a sling, and the thickness of the lifting lug and the lifting point is 33mm-36mm.

[0022] With the structural arrangement, the larger thickness of the lifting lug and the lifting point makes the connecting part have higher strength and durability.

[0023] Preferably, the angle between the sling and the main beam is 50°-70°.

[0024] With the structural arrangement, the angle between the sling and the main beam is specially designed, and the suitable angle can enhance the stability of the main beam.

[0025] Compared with the prior art, the utility model has the advantages that:

[0026] 1. The lifting device for large GRP pipeline provided by the utility model has the main beam to play the role of a balance beam, and the lifting point under the main beam can be connected with the GRP pipeline through a nylon sling, which can effectively prevent the pipeline from tilting, shaking and other unstable phenomena during lifting, and ensure the stability and safety of lifting.

[0027] 2. The lifting appliance for large GRP pipes provided by the utility model can evenly distribute the stress in the lifting process by adopting the multi-lifting-point design, avoids stress concentration, and thus significantly reduces the pipe wall damage, cracks or bending phenomenon caused by excessive local stress during the lifting process of the GRP pipe. The multi-lifting-point design greatly improves the stability of the lifting process, and ensures that the lifting is more stable and safe;

[0028] 3. The lifting appliance for large GRP pipes provided by the utility model is provided with stiffening ribs at the positions corresponding to the lifting points on the main beam, and the overall structural strength of the lifting appliance is enhanced. The stiffening design can effectively bear the gravity of the large GRP pipe and the dynamic load during lifting, prevents the deformation or failure of the lifting appliance due to overload, and further improves the safety and reliability of lifting;

[0029] 4. The lifting appliance is specially designed for large-diameter GRP pipes, fully considers the size, weight and brittle characteristics of the large pipe, can provide a more suitable lifting scheme for such pipes, and solves the damage problem that is prone to occur when the traditional lifting equipment faces large pipes. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The lifting appliance structure schematic diagram for large GRP pipes provided for the embodiment 1;

[0031] Figure 2 The lifting appliance structure schematic diagram for large GRP pipes provided for the embodiment 2;

[0032] Figure 3 The lifting appliance front view for large GRP pipes provided for the embodiment 3;

[0033] Figure 4 It is the main beam strength checking diagram;

[0034] Figure 5 It is the main beam deflection checking diagram;

[0035] Figure 6 It is the lifting lug strength checking diagram.

[0036] Markings in the drawing:

[0037] 1 - main beam, 11 - lifting lug, 12 - lifting point, 13 - stiffening rib, 14 - lifting lug reinforcing plate, 15 - auxiliary lug, 16 - reinforcing plate, 2 - nylon sling, 3 - lifting ring, 4 - sling. DETAILED DESCRIPTION

[0038] The utility model will be described in further detail in combination with specific embodiments. However, this should not be understood as limiting the scope of the above-mentioned subject matter of the utility model to the following embodiments. Any technology realized based on the content of the utility model belongs to the scope of the utility model.

[0039] In the description of the embodiments of the present application, the terms of orientation or position relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are based on the orientation or position relationship shown in the drawings or the orientation or position relationship when the product / device / apparatus of the present application is usually used. These terms of orientation or position relationship are only for the convenience of describing the present application or simplifying the description of the embodiments, and for the convenience of the technicians to quickly understand the scheme, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, the terms "horizontal", "vertical", "suspension", "parallel", etc. do not mean that the corresponding device / component / element must be absolutely horizontal or vertical or suspended or parallel, but can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to understand that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "suspension", "parallel", etc. and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present application.

[0041] In addition, the terms "first", "second", "third", etc. in the description of the present application are only used to distinguish the same or similar components, and should not be understood as emphasizing or implying the relative importance of the specific components.

[0042] In addition, in the description of the embodiments of the present application, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9, etc. in any case, or even more than 9.

[0043] In addition, in the description of the technical scheme of the present application, unless otherwise specified / limited / limited, the terms "set", "install", "connect", "connect", "set", "lay", "arrange" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, which can be welding, riveting, bolting, screwing, etc. The connection means commonly used in the art. This connection can be mechanical connection, or electrical connection or communication connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements.

[0044] Embodiment 1

[0045] As Figure 1 shown, the present embodiment provides a sling for large GRP pipes, which is suitable for hoisting large GRP pipes with a diameter ≥ 3000 mm and a self weight ≥ 20 tons.

[0046] Specifically, the sling for large GRP pipes provided by the present embodiment includes a main beam 1, which can use an I-beam. The top of the main beam 1 is provided with an ear 11. As Figure 1 shown, the number of ears 11 in the present embodiment is one. The ear 11 is located in the middle of the main beam 1, and the side wall of the ear 11 and the side wall of the main beam 1 are provided with at least four ear reinforcing plates 14, which have a thickness of 14-16 mm. Specifically, as Figure 1 shown, along the width direction of the main beam 1, two ear reinforcing plates 14 can be arranged on the left and right sides of the position where the main beam 1 is provided with the ear 11.

[0047] The ear 11 is located in the middle of the main beam 1, so that the overall sling can realize symmetrical distribution of stress during hoisting. By arranging a single ear 11 in the middle of the main beam 1, the left and right sides of the main beam 1 can balance the weight of the pipe, reducing problems such as tilting and shaking caused by uneven stress, and ensuring the stability and safety of the hoisting process. Especially when hoisting long and heavy GRP pipes, the design of a single ear 11 in the middle helps to optimize the hoisting center of gravity and prevent accidental tilting or imbalance. By arranging at least four ear reinforcing plates 14 with a thickness of 14-16 mm, the strength of the connection between the ear 11 and the main beam 1 is effectively enhanced. The ear 11 bears a huge tensile force during hoisting, especially during the hoisting of large GRP pipes, and the concentration of stress points may cause stress concentration at the connection between the ear 11 and the main beam 1. The reinforcing plate 16 can effectively disperse the stress at the ear 11, reduce the fatigue and damage risk of the local structure, and prolong the service life of the sling.

[0048] At least two lifting points 12 are arranged at the bottom of the main beam 1, and the distance between adjacent two lifting points 12 is 3.5-4.5 m, for example Figure 1 only two lifting points 12 are arranged, and the distance d between the two lifting points 12 can be 3.5 m, 4 m or 4.5 m. The position corresponding to the lifting point 12 of the main beam 1 is provided with a stiffening rib 13, and the thickness of the stiffening rib 13 is 14-16 mm, for example, the thickness of a single stiffening rib 13 can be 14 mm, 15 mm or 16 mm. Specifically, for example Figure 1 shown, along the width direction of the main beam 1, two stiffening ribs 13 can be arranged on the left and right sides of the position where the main beam 1 is provided with the lifting point 12.

[0049] Further, the top of the main beam 1 is also provided with at least two auxiliary ears 15, which are symmetrically arranged on both sides of the lifting lug 11. For example, as shown in Figure 1 , one auxiliary ear 15 is arranged on each side of the lifting lug 11. In use, the lifting lug 11 can be connected with the hook of the crawler crane through a sling, and the lifting point is connected with the GRP pipeline through a nylon belt. If further strengthening of the lifting stability is required, the auxiliary ear 15 can also be connected with the hook of the crawler crane through a sling. With this arrangement, single lifting lug 11 or lifting lug 11 + auxiliary ear 15 can be flexibly selected for lifting according to different working conditions and site requirements. When the lifting object is particularly heavy or higher stability is required, the auxiliary ear 15 can be used together with the main lifting lug 11 to achieve multi-point lifting, further dispersing the load pressure and ensuring the pipeline to be lifted more stably.

[0050] The lifting device for large GRP pipelines provided in the embodiment has the main beam 1 serving as a balance beam, and the lifting points 12 below the main beam 1 can be connected with the GRP pipeline through a nylon sling, which can effectively prevent the pipeline from tilting, shaking and other unstable phenomena during lifting, and ensure the stability and safety of lifting.

[0051] The multi-lifting point design (the distance between the lifting points 12 is 3.5-4.5m) can evenly distribute the stress during lifting, avoiding stress concentration, thereby significantly reducing the damage, cracks or bending of the pipe wall of the GRP pipeline caused by excessive local stress during lifting. The multi-lifting point design greatly improves the stability of the lifting process, ensuring that the lifting is more stable and safe.

[0052] The main beam 1 is provided with stiffening ribs 13 at positions corresponding to the lifting points 12, enhancing the overall structural strength of the lifting device. This stiffening design can effectively withstand the gravity of the large GRP pipeline and the dynamic load during lifting, preventing the lifting device from deforming or failing due to overloading, and further improving the safety and reliability of lifting.

[0053] The lifting device is specially designed for large-diameter GRP pipelines, fully considering the size, weight and brittle characteristics of large pipelines, and can provide a more suitable lifting scheme for such pipelines, solving the damage problem that the traditional lifting equipment easily encounters when facing large pipelines

[0054] Embodiment 2

[0055] As shown in Figure 2 , different from embodiment 1, the lifting device for large GRP pipelines provided in the embodiment has two lifting lugs 11, and the distance between the adjacent two lifting lugs 11 is 7-9m (for example Figure 2 , the length of the distance D between the two lifting lugs 11 can be 7m, 8m or 9m), and the number of lifting points 12 is four, and the distance between the adjacent two lifting points 12 is 3.5-4.5m (for example Figure 2The length of the distance d between two adjacent lifting points 12 can be 3.5 meters, 4 meters, 4.5 meters, the lifting lugs 11 are evenly distributed on the main beam 1, and the lifting points 12 are evenly distributed on the main beam 1. Specifically, for example Figure 2 As shown, the two lifting lugs 11 are equidistant from the end of the main beam 1 closest to them, i.e. the lifting lugs 11 are evenly distributed on the main beam 1; the number of lifting points 12 is four, for example Figure 2 As shown, the distance d between the lifting points 12 is equal, and the first lifting point 12 and the last lifting point 12 are equidistant from the end of the main beam 1 closest to them, i.e. the lifting points 12 are evenly distributed on the main beam 1.

[0056] With this structural arrangement, by evenly distributing two lifting lugs 11 and four lifting points 12 on the main beam 1, the force on the entire lifting device is more uniform, reducing the risk of a single lifting lug 11 or lifting point 12 bearing excessive load. When hoisting large GRP pipes, the distribution of lifting lugs 11 and lifting points 12 can reasonably distribute the weight of the pipe, reducing the likelihood of excessive local stress, and ensuring the structural stability of the lifting device and the pipe during hoisting. Especially when the GRP pipe is long and heavy, the distribution of multiple lifting lugs 11 and lifting points 12 can effectively control the bending moment during hoisting, reducing the risk of deformation and damage to the pipe.

[0057] Further, the lifting device for large GRP pipes also includes a reinforcing plate 16, which is welded to the main beam 1, as shown in Figure 2 As shown, the reinforcing plate 16 can be symmetrically distributed on both sides of the main beam 1 along the width direction of the main beam 1.

[0058] With this structural arrangement, the design of the reinforcing plate 16 can significantly enhance the bending and torsional resistance of the main beam 1 by being symmetrically distributed on both sides of the main beam 1. When hoisting large GRP pipes, the main beam 1 will be subjected to bending stress and torsional moment from different directions. The addition of the reinforcing plate 16 effectively improves the overall stiffness of the main beam 1, reducing the degree of deformation of the main beam 1 when under stress, ensuring the structural strength and stability of the lifting device under high load. This makes the lifting device less likely to produce permanent deformation during long-term use, prolonging the service life of the lifting device.

[0059] Further, the length of the reinforcing plate 16 can be 7m-9m (for example Figure 2 The length L of the reinforcing plate 16 can be 7 meters, 8 meters, 9 meters, and the thickness of the reinforcing plate 16 is 14mm-16mm, for example, it can be 14mm, 15mm, 16mm.

[0060] With this structure, the long length (7-9 meters) of the reinforcing plate 16 covers most of the area of the main beam 1, effectively enhancing the stability of the overall structure. The thickness of the long plate (14-16 mm) significantly improves the bending and torsional resistance of the reinforcing plate 16. The reinforcing plate 16 designed in this way can better withstand the bending moment and torsional moment generated during hoisting, reducing the risk of deformation caused by uneven stress.

[0061] Further, as shown in Figure 2 The reinforcing plate 16 is located between two adjacent lifting lugs 11. That is, the reinforcing plate 16 is installed at the position corresponding to the lifting lug 11 on the main beam 1, which can effectively resist deformation caused by local stress, improve the overall stress balance of the main beam 1, and reduce the risk of deformation of the main beam 1 during loading.

[0062] Embodiment 3

[0063] On the basis of embodiment 2, the lifting device for large GRP pipes provided in this embodiment further comprises a nylon sling 2, both ends of which are connected to the same lifting point 12. The width of the nylon sling 2 is 40-60 cm, for example, it can be 40 cm, 45 cm, 50 cm, 55 cm, or 60 cm. For example Figure 3 As shown in the figure, four lifting points 12 are provided on the same main beam 1, and each lifting point 12 is provided with a nylon sling 2. The width of the nylon sling 2 is wide, which can provide a larger contact area, thereby significantly enhancing its carrying capacity. The wide sling can better disperse the load, reduce the concentrated pressure on the pipe, and reduce the risk of pipe damage caused by local overload, especially suitable for hoisting large GRP pipes; the flexibility of the nylon material allows the sling to effectively absorb and disperse impact forces when in contact with the pipe, reducing the risk of friction and scratching the surface of the pipe. Compared with hard lifting devices such as steel wire ropes, the nylon sling 2 provides stronger protection for the pipe during hoisting, reducing the likelihood of damage to the pipe during hoisting.

[0064] Further, the lifting device for large GRP pipes further comprises a lifting ring 3, which is connected to the lifting lug 11 through a sling 4. The thickness of the lifting lug 11 and the lifting point 12 is 33-36 mm, for example, 33 mm, 34 mm, 35 mm, or 36 mm; the angle α between the sling 4 and the main beam 1 is 50-70°. As shown in Figure 3As shown, the greater thickness of the lifting lug 11 and the lifting point 12 gives the connection part greater strength and durability. This design can withstand greater lifting loads, reduce the risk of damage caused by stress concentration during the lifting process, and thus improve the overall reliability of the sling; the lifting ring 3 is connected to the lifting lug 11 through the sling 4, which can provide additional stability during the lifting process. The design of the lifting ring 3 makes the force on the sling 4 more uniform. The angle between the sling 4 and the main beam 1 is specially designed, and a suitable angle can enhance the stability of the main beam 1. An angle that is too small may cause excessive tension in the sling 4, while an angle that is too large may affect the balance of the lifting. The 50°-70° design can provide good stability during the lifting process, ensure the stability of the pipeline during the lifting process, and reduce the risk of tilting and swinging.

[0065] Midas finite element analysis software was used to verify the lifting fixture for large GRP pipes provided in this embodiment. The main beam 1 is constructed of 12-meter-long H-shaped steel, also known as I-beam (S355JR+AR); the reinforcement plate 16 is constructed of 15-mm-thick Q345 steel; and the lifting lugs 11 and lifting points 12 are both constructed of 350-mm-long, 165-mm-high, and 35-mm-thick Q345 steel.

[0066] The dead load is the dead weight of the sling used for large GRP pipes (15.8KN) + the weight of the GRP pipes (230KN); the strength design load combination is 1.2×1.4×dead load, and the allowable design load combination is 1.2×dead load, where 1.2 is the dynamic load factor.

[0067] like Figure 4 The following is a strength calculation diagram of main beam 1. From the calculation results, it can be seen that the strength of main beam 1 meets the strength requirements:

[0068] σ max =90.6MPa<[σ]=345MPa

[0069] like Figure 5 The figure shows the deflection calculation diagram of main beam 1. From the calculation results, it can be seen that the deflection of main beam 1 meets the deflection requirements:

[0070]

[0071] Welding verification is performed. Since the two lifting lugs 11 on the upper part of the main beam 1 bear a large force, the welds of the lifting lugs 11 are calculated according to the requirements of the "Standard for Design of Steel Structures" GB 50017-2017:

[0072]

[0073]

[0074]

[0075] σ f represents normal stress perpendicular to the length direction of the weld;

[0076] τ f represents shear stress along the length direction of the weld;

[0077] F z represents axial tension perpendicular to the length direction of the weld, taking 123 kN;

[0078] F x represents axial tension along the length direction of the weld, taking 71.01 kN;

[0079] h e represents the calculated thickness (mm) of the fillet weld, taking 3 mm;

[0080] β f represents the magnification coefficient, taking 1.0;

[0081] l w represents the calculated length (mm) of the fillet weld, taking 350 mm x 2 = 700 mm;

[0082] represents the strength design value (N / mm 2 ) of the fillet weld, taking 200 N / mm 2 ;

[0083] Through calculation,

[0084] It can be seen that the weld of the lifting lug 11 meets the requirements.

[0085] Since the force borne by the two lifting lugs 11 on the upper portion of the main beam 1 is large, Ansys Workbench is used to perform strength checking on the lifting lug 11, and all parameters are the same as those in the checking of the main beam 1, and the checking result is shown in Table 2. Figure 6

[0086] σ max = 162.93 MPa < [σ] = 345 MPa

[0087] It can be seen from the calculation result that the strength of the lifting lug 11 meets the requirements.

[0088] The overall checking result of the lifting device for large GRP pipes in this embodiment is shown in Table 1.

[0089] Table 1 Checking result statistical table

[0090]

[0091] ​The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sling for large GRP pipes, characterized in that: The invention comprises a main beam (1), wherein a lifting lug (11) is provided at the top of the main beam (1), at least two lifting points (12) are provided at the bottom of the main beam (1), the spacing between two adjacent lifting points (12) is 3.5m-4.5m, and stiffening ribs (13) are provided at positions of the main beam (1) corresponding to the lifting points (12), and the thickness of the stiffening ribs (13) is 14mm-16mm.

2. A sling for large GRP pipes according to claim 1, characterized in that: The number of the lifting lug (11) is one, the lifting lug (11) is located in the middle of the main beam (1), and at least four lifting lug reinforcement plates (14) are provided between the side wall of the lifting lug (11) and the side wall of the main beam (1), and the thickness of the lifting lug reinforcement plates (14) is 14 mm to 16 mm.

3. A sling for large GRP pipes according to claim 2, characterized in that: At least two auxiliary ears (15) are also provided on the top of the main beam (1), and the auxiliary ears (15) are symmetrically arranged on both sides of the lifting ear (11).

4. A hanger for large GRP pipes according to claim 1, characterized in that: The number of the lifting lugs (11) is two, and the distance between two adjacent lifting lugs (11) is 7m-9m. The number of the lifting points (12) is four, and the distance between two adjacent lifting points (12) is 3.5m-4.5m. The lifting lugs (11) are evenly distributed on the main beam (1), and the lifting points (12) are evenly distributed on the main beam (1).

5. A sling for large GRP pipes according to claim 4, characterized in that: It also includes a reinforcing plate (16), the reinforcing plate (16) being welded to the main beam (1), and the reinforcing plates (16) being symmetrically distributed on both sides of the main beam (1) along the width direction of the main beam (1).

6. A sling for large GRP pipes according to claim 5, characterized in that: The length of the reinforcing plate (16) is 7m-9m, and the thickness of the reinforcing plate (16) is 14mm-16mm.

7. A hanger for large GRP pipes according to claim 6, characterized in that: The reinforcing plate (16) is located between two adjacent lifting ears (11).

8. A hanger for large GRP pipes according to claim 4, characterized in that: It also includes a nylon sling (2), both ends of which are connected to the same sling point (12), and the width of the nylon sling (2) is 40 cm-60 cm.

9. A hanger for large GRP pipes according to claim 4, characterized in that: It also includes a lifting ring (3), which is connected to the lifting lug (11) via a sling (4), and the thickness of the lifting lug (11) and the lifting point (12) is 33 mm to 36 mm.

10. A hanger for large GRP pipes according to claim 9, characterized in that: The included angle between the sling (4) and the main beam (1) is 50°-70°.

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