A prefabricated drainage system for highways

Abstract

This utility model discloses a prefabricated drainage facility for highways, belonging to the field of highway engineering technology. The facility includes prefabricated drainage components such as rectangular side ditches for road cut covers, rectangular drainage ditches for embankments, trapezoidal drainage ditches for embankments, step-type rapid flow channels, and platform intercepting ditches. Each component is assembled from standardized prefabricated segments in a factory. Adjacent prefabricated segments are joined using nested overlaps, tongue-and-groove overlaps, or concave-convex nested overlaps, with 1cm thick rubber waterstops installed along the joints. The sidewalls of the prefabricated segments are equipped with pre-embedded lifting bolts, and the segment length can be selected from 0.5m, 1.0m, 1.5m, or 2.0m according to the on-site lifting capacity. This utility model solves the problems of long construction cycles and difficult quality control in traditional cast-in-place drainage facilities, as well as the uneven splicing and insufficient joint seepage prevention performance of existing prefabricated facilities. It achieves controllable construction quality, shortened construction period, improved joint seepage prevention performance, and enhanced structural durability, making it suitable for various drainage scenarios on highways.

Description

Technical Field

[0001] This utility model belongs to the field of highway engineering technology, specifically relating to a prefabricated drainage facility for highways that adopts a prefabricated assembly structure. Background Technology

[0002] Highway drainage facilities are a key component in ensuring the safety of road structures and traffic performance. They mainly include roadbed ditches, embankment drainage ditches, slope intercepting ditches, steps, and rapid flow channels. Their function is to promptly remove water accumulated on the road surface and slopes, preventing rainwater from eroding and damaging the roadbed and slopes.

[0003] Currently, the construction methods for highway drainage facilities are mainly divided into two categories: cast-in-place concrete construction and precast assembly construction. Traditional rectangular and trapezoidal side ditches and drainage ditches are mostly constructed using cast-in-place concrete. This method requires on-site formwork, pouring, and curing, which results in a long construction period and significant impact on the surrounding environment. Especially in road reconstruction and expansion projects, the extended construction time significantly increases the difficulty of maintaining traffic flow. At the same time, controlling the thickness of the ditch paving in cast-in-place construction is difficult, and quality defects such as honeycomb and pitting are prone to occur due to problems with the pouring process, affecting the durability of the drainage facilities.

[0004] While existing prefabricated assembly construction methods have shortened on-site construction time to some extent, they generally suffer from splicing quality problems: prefabricated components are not spliced ​​evenly, easily resulting in misalignment; the water-sealing performance at the joints is poor, allowing rainwater to easily seep into the joints, leading to foundation erosion, component hollowing and deformation, and making it difficult to effectively control construction quality. Therefore, there is an urgent need for a drainage facility structure that can solve the problems of difficult construction quality control, long construction period, and insufficient joint seepage prevention performance. Utility Model Content

[0005] In view of this, the purpose of this utility model is to overcome the shortcomings of the existing related technologies and provide a prefabricated assembly structure for highways to solve the problems of long construction cycle and difficult quality control of traditional cast-in-place drainage facilities, as well as the problems of uneven splicing and poor joint sealing of prefabricated drainage facilities, which can easily lead to scouring, hollowing and deformation. The goal is to achieve controllable construction quality, shortened construction period, improved joint seepage prevention performance and enhanced structural durability of drainage facilities.

[0006] To achieve the above objectives, this utility model provides a prefabricated drainage facility for highways, including at least one prefabricated drainage component, which is assembled from several prefabricated segments; a splicing structure and a water-stopping device are provided between adjacent prefabricated segments, the splicing structure is a nested overlap or a tongue-and-groove overlap, and the water-stopping device is a rubber water-stopping strip arranged along the length of the joint; and pre-embedded lifting bolts are provided on the side wall of each prefabricated segment.

[0007] Furthermore, the prefabricated drainage components include rectangular side ditches of road cut covers or rectangular drainage ditches of embankments, and the prefabricated segments of the rectangular side ditches of road cut covers and rectangular drainage ditches of embankments are all U-shaped structures; adjacent U-shaped prefabricated segments are nested and overlapped, with an overlap length of 5cm; the rubber waterstop strip is installed along the inner joint of the U-shaped structure and has a thickness of 1cm.

[0008] Furthermore, the rectangular side ditch of the road cut cover plate also includes a prefabricated cover plate, which is erected on top of the U-shaped prefabricated segment. The prefabricated cover plate is provided with a drainage outlet, the size of which is adjustable.

[0009] Furthermore, the prefabricated drainage component includes a trapezoidal drainage ditch for the embankment. The prefabricated segment of the trapezoidal drainage ditch is a three-section structure, including a bottom prefabricated block and two symmetrically arranged side prefabricated blocks. The splicing structure between the bottom prefabricated block and the side prefabricated blocks is a tongue-and-groove joint, and a cement mortar grout layer with a thickness of 1 to 2 cm is provided at the joint. The rubber waterstop strip is installed along the inner side of the tongue-and-groove joint and has a thickness of 1 cm. The top surface of the side prefabricated block is provided with a corner platform.

[0010] Furthermore, the prefabricated drainage component includes a step-and-flow channel, the prefabricated segment of which is a longitudinal unit structure, each longitudinal unit structure containing two steps and having water-retaining sidewalls on both sides; the top and bottom of the step-and-flow channel are provided with separate platform prefabricated segments; adjacent longitudinal unit structures and longitudinal unit structures and platform prefabricated segments are connected by a concave-convex nested overlap, with an overlap width of 5cm; every four longitudinal unit structures are provided with a longitudinal unit with an ear wall, the ear wall protruding from the water-retaining sidewall; the rubber waterstop strip is installed along the inner side of the concave-convex overlap joint, with a thickness of 1cm.

[0011] Furthermore, the prefabricated drainage component includes a platform intercepting ditch, which is adapted to fill sections, earth excavation sections, or rock excavation sections; the splicing structure between the prefabricated segments of the platform intercepting ditch is a tongue and groove joint, and the joint is provided with a cement mortar grout layer and a rubber waterstop strip, and the splicing method is consistent with that of the embankment trapezoidal drainage ditch.

[0012] Furthermore, the length of the prefabricated segment is 0.5m, 1.0m, 1.5m or 2.0m, which can be selected according to the on-site hoisting capacity.

[0013] The present invention, by adopting the above technical solution, has at least the following beneficial effects:

[0014] In this utility model, all drainage components are produced using standardized prefabricated segments in the factory, which avoids the problems of difficult control of paving thickness and easy occurrence of honeycomb and pitted surfaces in traditional cast-in-place construction. The construction quality is more controllable, and only assembly work is required on site, which greatly shortens the construction cycle. It is especially suitable for renovation and expansion projects and can effectively reduce traffic pressure.

[0015] In this invention, adjacent precast segments are connected by optimized splicing structures such as nested overlap, tongue and groove overlap, or concave-convex nested overlap. Combined with the elastic sealing effect of a 1cm thick rubber waterstop strip, this not only solves the problem of uneven splicing and misalignment in existing precast construction, but also enhances the water sealing and seepage prevention performance of the joints, preventing rainwater from seeping into the joints and causing foundation erosion, component hollowing and deformation, and significantly improving the integrity and durability of the drainage facilities.

[0016] In this utility model, the precast segment sidewalls are equipped with pre-embedded hoisting bolts to facilitate on-site hoisting operations, and the segment length can be selected from 0.5m, 1.0m, 1.5m or 2.0m according to the hoisting capacity to adapt to different construction scenarios; at the same time, the trapezoidal drainage ditch side precast blocks are equipped with corner platforms, steps that also serve as rapid flow channels, and additional ear wall units, etc., which further enhance the structural stability and erosion resistance, and improve the practical performance and landscape effect of the drainage facilities. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the prefabricated side ditch with cover plate in Embodiment 2;

[0019] Figure 2 This is a longitudinal section view of the prefabricated drainage ditch in Example 2;

[0020] Figure 3 This is a schematic diagram of the prefabricated rectangular drainage ditch in Embodiment 3.

[0021] Figure 4 This is a longitudinal section view of the prefabricated drainage ditch in Example 3;

[0022] Figure 5 This is a schematic diagram of the application scenario in Example 4;

[0023] Figure 6 This is a schematic diagram of the structure of Embodiment 4;

[0024] Figure 7This is a schematic diagram of the side prefabricated block in Embodiment 4;

[0025] Figure 8 This is a schematic diagram of the bottom precast block in Embodiment 4;

[0026] Figure 9 This is a schematic diagram of the integrated step passage and rapid flow drainage functions in Embodiment 4;

[0027] Figure 10 This is a schematic diagram of the main body of the rapid flow channel in Embodiment 4;

[0028] Figure 11 This is a schematic diagram of type A in embodiment five;

[0029] Figure 12 This is a schematic diagram of type B in Example 5;

[0030] Figure 13 This is a schematic diagram of type C in Example 5.

[0031] In the diagram: 21. U-shaped concrete segment; 22. Rubber waterstop strip; 23. Precast concrete cover plate; 24. Reserved drainage outlet; 31. U-shaped precast segment; 32. Rubber waterstop strip; 33. Sand cushion layer; 34. Anti-corrosion and seepage-proof PE membrane; 41. Bottom precast block; 42. Side precast block; 43. Cement mortar bedding layer; 44. Rubber waterstop strip; 51. Longitudinal precast unit; 52. Water-retaining sidewall; 53. Rubber waterstop strip. Detailed Implementation

[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims.

[0033] Example 1

[0034] This embodiment provides a prefabricated drainage facility for highways, including at least one prefabricated drainage component, which is assembled from several prefabricated segments; a splicing structure and a water-stopping device are provided between adjacent prefabricated segments, the splicing structure is a nested overlap or a tongue-and-groove overlap, and the water-stopping device is a rubber water-stopping strip arranged along the length of the joint; pre-embedded lifting bolts are provided on the side wall of the prefabricated segment.

[0035] In one embodiment, the prefabricated drainage components in this embodiment include rectangular side ditches of road cut covers or rectangular drainage ditches of embankments. The prefabricated segments of the rectangular side ditches of road cut covers and rectangular drainage ditches of embankments are all U-shaped structures. The adjacent U-shaped prefabricated segments are nested and overlapped with an overlap length of 5cm. The rubber waterstop strip is installed along the inner joint of the U-shaped structure and has a thickness of 1cm.

[0036] As one implementation method, the rectangular side ditch of the road cut cover plate in this embodiment also includes a prefabricated cover plate, which is erected on top of the U-shaped prefabricated segment. The prefabricated cover plate is provided with a drainage outlet, the size of which is adjustable.

[0037] In one embodiment, the prefabricated drainage component in this embodiment includes a trapezoidal drainage ditch of the embankment. The prefabricated segment of the trapezoidal drainage ditch is a three-section structure, including a bottom prefabricated block and two symmetrically arranged side prefabricated blocks. The splicing structure between the bottom prefabricated block and the side prefabricated blocks is a tongue and groove joint, and a cement mortar grout layer with a thickness of 1 to 2 cm is provided at the joint. The rubber waterstop strip is installed along the inner side of the tongue and groove joint and has a thickness of 1 cm. The top surface of the side prefabricated block is provided with a corner platform.

[0038] In one embodiment, the prefabricated drainage component in this embodiment includes a step-and-flow channel. The prefabricated segments of the step-and-flow channel are longitudinal unit structures, each of which includes two steps and has water-retaining sidewalls on both sides. The top and bottom of the step-and-flow channel are provided with separate platform prefabricated segments. Adjacent longitudinal unit structures and longitudinal unit structures and platform prefabricated segments are connected by a concave-convex nested overlap with an overlap width of 5cm. Every four longitudinal unit structures, there is a longitudinal unit with an ear wall that protrudes from the water-retaining sidewalls. The rubber waterstop strip is installed along the inner side of the concave-convex overlap joint and has a thickness of 1cm.

[0039] As one implementation method, the prefabricated drainage component in this embodiment includes a platform intercepting ditch, which is adapted to fill sections, soil excavation sections, or rock excavation sections; the splicing structure between the prefabricated segments of the platform intercepting ditch is a tongue and groove joint, and the joint is provided with a cement mortar grout layer and a rubber waterstop strip, and the splicing method is consistent with that of the embankment trapezoidal drainage ditch.

[0040] As one implementation method, the length of the prefabricated segment in this embodiment is 0.5m, 1.0m, 1.5m or 2.0m, which can be selected according to the on-site hoisting capacity.

[0041] This embodiment utilizes prefabricated segments of various drainage components, such as factory-standardized prefabricated road cut cover rectangular side ditches, embankment rectangular drainage ditches, embankment trapezoidal drainage ditches, step-type rapid flow channels, and platform intercepting ditches. These segments are combined with splicing structures using nested overlaps, tongue-and-groove overlaps, or concave-convex nested overlaps (concave-convex nested overlaps are a specific structural form of nested overlaps). Furthermore, the elastic sealing design of rubber waterstops and the inclusion of pre-embedded lifting bolts facilitate on-site hoisting and allow for flexible selection of segment lengths. This achieves precise control over the construction quality of drainage facilities, effectively shortens the on-site construction period, significantly improves the seepage prevention performance of joints and the overall structural integrity, and ensures the stable and durable operation of drainage facilities in various highway scenarios.

[0042] Example 2: Prefabrication scheme for rectangular side ditches with road cut covers

[0043] 1) The U-shaped prefabrication of the integral side ditch eliminates longitudinal joints and enhances its overall integrity;

[0044] 2) A nested overlapping method is adopted in the horizontal direction with an overlap length of 5cm to ensure that there is no uneven settlement in the horizontal direction and to avoid misalignment;

[0045] 3) The joint sealant is installed along the U-shape of the paving using rubber waterstop strips, which have a certain degree of elasticity and can prevent the sealant from falling off due to thermal expansion and contraction.

[0046] 4) The prefabrication length of a single segment can be set to 0.5m, 1.0m, 1.5m, and 2.0m, depending on the actual hoisting capacity and site conditions. Pre-embedded bolts are installed on both sides of the drainage ditch for easy hoisting.

[0047] 5) The cover plate is a traditional prefabricated slab, and the drainage capacity can be adjusted by adjusting the size of the drain outlet on the cover plate.

[0048] like Figure 1 Schematic diagram of prefabricated side ditch with cover plate; as shown Figure 2 Longitudinal section view of prefabricated drainage ditch;

[0049] This embodiment is designed for drainage needs in roadbed areas, and the core structural details are as follows:

[0050] U-shaped prefabricated segmental structure: The main body of the side ditch adopts U-shaped concrete segments 21 prefabricated in the factory, with no longitudinal joints and strong integrity; the inner side wall of the U-shaped segment is pre-embedded with hoisting bolts (not shown in the figure), with a spacing of 1.5m, which facilitates on-site hoisting and positioning.

[0051] Horizontal splicing design: adjacent U-shaped segments adopt nested overlap, and the overlap length is strictly controlled to 5cm; the inner side of the joint is fully covered with 1cm thick rubber waterstop strip 22 along the U-shaped outline to compensate for thermal expansion and contraction deformation.

[0052] Precast cover plate and drainage design: A precast concrete cover plate 23 is erected on the top of the U-shaped segment, and a drainage outlet 24 is reserved between the cover plates. The size of the drainage outlet can be adjusted according to the water volume to ensure that the surface water is discharged into the side ditch in an orderly manner.

[0053] Example 3: Prefabrication scheme for rectangular drainage ditches on embankments

[0054] 1) The U-shaped prefabrication of the integral side ditch eliminates longitudinal joints and enhances its overall integrity;

[0055] 2) A nested overlapping method is adopted in the horizontal direction with an overlap length of 5cm to ensure that there is no uneven settlement in the horizontal direction and to avoid misalignment;

[0056] 3) The joint sealant is installed along the U-shape of the paving using rubber waterstop strips, which have a certain degree of elasticity and can prevent the sealant from falling off due to thermal expansion and contraction.

[0057] 4) The prefabrication length of a single segment can be set to 0.5m, 1.0m, 1.5m, and 2.0m, depending on the actual hoisting capacity and site conditions. Pre-embedded bolts are installed on both sides of the drainage ditch for easy hoisting.

[0058] like Figure 3 This is a schematic diagram of a prefabricated rectangular drainage ditch; for example... Figure 4 This is a longitudinal section view of a prefabricated drainage ditch;

[0059] This embodiment is applicable to embankment slope drainage. The structural design is optimized in conjunction with the rectangular side ditch of the road cut cover. Supplementary explanations are as follows:

[0060] U-shaped segment adaptability: The main body of the drainage ditch is a U-shaped prefabricated segment 31. The cross-sectional dimensions are adjusted according to the embankment height. It is continuously assembled longitudinally without joints, and the side walls are also equipped with pre-embedded hoisting bolts (not shown in the figure).

[0061] Splicing and seepage prevention reinforcement: Adjacent segments adopt the same nested overlap as in Example 2, with an overlap length of 5cm. A 1cm thick rubber waterstop strip 32 is installed on the inner side of the joint; a 10cm sand cushion layer 33 and a 1.5mm thick anti-corrosion and seepage prevention PE membrane 34 are laid at the bottom to form a double waterproof system.

[0062] Example 4: Prefabrication scheme for trapezoidal drainage ditches on embankments

[0063] 1) The horizontal three-section design is set with tongue and groove joints. Cement mortar is used for the base. First, the bottom precast block is installed. After the joint is grouted for 1 to 2 cm, the precast blocks are laid on both sides.

[0064] 2) Install rubber waterstop strips in the transverse gaps between the front and rear precast slabs.

[0065] 3) Corner platforms are set on the top surface of the paved sides to reduce the erosion and hollowing of the back of the slab by rainwater.

[0066] like Figures 5 to 8 As shown, this embodiment is designed for the gentle slope area of ​​the embankment and adopts a three-section assembly structure. Further details are as follows:

[0067] The drainage ditch is composed of three precast blocks: the bottom precast block 41 and the two symmetrical side precast blocks 42. All of them are produced in a factory with standardized production and the dimensional error is controlled within ±2mm.

[0068] Tongue and groove joint splicing process: The bottom precast block and the side precast block are connected by tongue and groove joint. A 1 to 2 cm thick cement mortar base layer 43 is first laid at the joint, and then the side precast block is installed. A 1 cm thick rubber waterstop strip 44 is installed on the inside of the transverse joint to block the path of rainwater infiltration.

[0069] Anti-erosion details: A 15cm wide corner platform is set on the top surface of the precast blocks on the side. The platform is inclined 4% towards the inside of the ditch to reduce the direct erosion of the soil behind the ditch wall by rainwater.

[0070] Example 5: Prefabricated Scheme for Stepped Flow Channel

[0071] 1) Longitudinal segmental design, with two steps forming a unit, each unit having water-retaining sidewalls on both sides, and the top and bottom platforms of the steps being separate segments.

[0072] 2) To increase the anti-slip force of the steps, an ear wall unit is added every 4 units.

[0073] 3) The units are joined by a concave-convex nesting joint to improve the overall integrity, with an overlap width of 5cm.

[0074] 4) The joints are designed with rubber waterstop strips, which can effectively buffer stress concentration between units while sealing water.

[0075] like Figure 9 and Figure 10 As shown, this embodiment integrates the functions of step passage and rapid flow drainage, and the structural design is as follows:

[0076] Longitudinal unit division: The main body of the rapid flow channel is divided into longitudinal prefabricated units 51 according to "two steps as one unit". Each unit has a water-retaining sidewall 52 with a height of 20cm on both sides; separate platform prefabricated segments are set at the top and bottom of the steps, which are smoothly connected to the main unit.

[0077] Anti-sliding and integrity enhancement: Adjacent units and units and platform segments adopt concave-convex nested overlap with an overlap width of 5cm; every 4 standard units, an additional unit with an ear wall is added, the ear wall protruding 10cm from the water-retaining side wall and embedded in the slope soil.

[0078] Joint sealing design: A 1cm thick rubber waterstop strip 53 is installed on the inside of all lap joints to ensure water sealing effect and buffer stress concentration between units.

[0079] Example 6: Prefabricated Scheme for Platform Interception Ditch

[0080] Different assembly schemes are adopted for ditches depending on the slope conditions, and the splicing scheme is the same as that for trapezoidal drainage ditches.

[0081] This embodiment is adaptable to different slope environments, and its core design is as follows:

[0082] Scene-specific adaptation structure:

[0083] Type A, such as Figure 11 : Applicable to fill sections and earth excavation sections, the trench body has a shallow trapezoidal structure;

[0084] Type B, such as Figure 12 : Applicable to rock excavation sections, with trench depth increased to 50cm;

[0085] Type C, such as Figure 13 It is suitable for transition sections between rock excavation and filling, and adopts a variable cross-section design.

[0086] Splicing process: The prefabricated segments of the three types of intercepting ditches are spliced ​​with tongue and groove joints. A 1 to 2 cm cement mortar base layer and a 1 cm thick rubber waterstop strip are installed at the joints to ensure the reliability of seepage prevention under different geological conditions.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A highway modular drainage system, characterized by: It includes at least one prefabricated drainage component, which is assembled from several prefabricated segments; a splicing structure and a water-stopping device are provided between adjacent prefabricated segments, the splicing structure is a nested overlap or a tongue-and-groove overlap, and the water-stopping device is a rubber water-stopping strip arranged along the length of the joint; and pre-embedded lifting bolts are provided on the side wall of the prefabricated segment.

2. The highway modular drainage facility according to claim 1, characterized in that: The prefabricated drainage components include rectangular side ditches of road cut covers or rectangular drainage ditches of embankments. The prefabricated segments of the rectangular side ditches of road cut covers and rectangular drainage ditches of embankments are all U-shaped structures. The adjacent U-shaped prefabricated segments are nested and overlapped with an overlap length of 5cm. The rubber waterstop strip is installed along the inner joint of the U-shaped structure and has a thickness of 1cm.

3. The highway modular drainage facility according to claim 2, characterized in that: The rectangular side ditch of the road cut cover plate also includes a prefabricated cover plate, which is erected on top of the U-shaped prefabricated segment. The prefabricated cover plate is provided with a drainage outlet, the size of which is adjustable.

4. The highway modular drainage facility according to claim 1, characterized in that: The prefabricated drainage component includes a trapezoidal drainage ditch for the embankment. The prefabricated segment of the trapezoidal drainage ditch is a three-section structure, including a bottom prefabricated block and two symmetrically arranged side prefabricated blocks. The splicing structure between the bottom prefabricated block and the side prefabricated block is a tongue and groove joint, and a cement mortar grout layer with a thickness of 1 to 2 cm is provided at the joint. The rubber waterstop strip is installed along the inner side of the tongue and groove joint and has a thickness of 1 cm. The top surface of the side prefabricated block is provided with a corner platform.

5. The highway modular drainage facility according to claim 1, characterized in that: The prefabricated drainage component includes a step-and-flow channel, the prefabricated segments of which are longitudinal unit structures, each longitudinal unit structure containing two steps and water-retaining sidewalls on both sides; the top and bottom of the step-and-flow channel are provided with separate platform prefabricated segments; adjacent longitudinal unit structures and longitudinal unit structures and platform prefabricated segments are connected by a concave-convex nested overlap, with an overlap width of 5cm; every four longitudinal unit structures are provided with a longitudinal unit with an ear wall, the ear wall protruding from the water-retaining sidewalls; the rubber waterstop strip is installed along the inner side of the concave-convex overlap joint, with a thickness of 1cm.

6. The highway modular drainage facility of claim 1, wherein: The prefabricated drainage components include a platform intercepting ditch, which is suitable for fill sections, earth excavation sections, or rock excavation sections; the splicing structure between the prefabricated segments of the platform intercepting ditch is a tongue and groove joint, and the joint is provided with a cement mortar grout layer and a rubber waterstop strip, and the splicing method is consistent with that of the embankment trapezoidal drainage ditch.

7. The highway modular drainage facility according to any one of claims 1 to 6, characterized in that: The length of the prefabricated segments is 0.5m, 1.0m, 1.5m or 2.0m, which can be selected according to the on-site hoisting capacity.

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