A quick-mounting and dismounting custom safety net

Abstract

The application discloses a kind of fast hanging and removing customized safety flat net, including a, safety flat net unit division;B, safety flat net unit grouping is set;C, safety flat net unit group is sorted and grouped according to width;D, numbered flat net unit is sorted and grouped according to length;E, safety flat net unit is customized;F, hang safety flat net unit, the width, length and quantity of safety flat net unit that the application can directly obtain need customization, when using, it is saved that " splicing " this intermediate link, the width and length of safety flat net are grouped and merged by width and length to safety flat net, so that the kind of width and length of safety flat net can be reduced, so that the stacking, identification and use of safety flat net can be facilitated, the hanging and removing efficiency of safety flat net can be greatly improved, construction progress is accelerated, and construction cost can also be greatly saved.

Description

Technical Field

[0001] The present invention relates to a customized safety flat net that can be quickly hung and dismantled. Background Art

[0002] Safety nets are flexible, protective nets installed beneath high-altitude construction sites to prevent accidents caused by falling people or objects. Made of braided ropes, safety nets are crucial for mitigating safety accidents during high-altitude construction.

[0003] There are two ways to purchase safety nets. Most safety net purchase plans are unified and smaller-sized safety nets, such as Figure 5 As shown, the common size is about 3 to 6 meters. For large-space projects such as large-span steel structure factories and large-span trusses, small-sized safety nets are spliced ​​together to form a large-sized safety net to meet the requirements of the protection unit. This "splicing" method requires a lot of manpower and time costs; another way is to purchase according to the size of the actual protection unit. However, in actual projects, the size of the protection unit is often different, and sometimes the size of the protection unit varies greatly. Purchasing according to the size of each protection unit requires purchasing a lot of safety nets of different sizes and categories, which increases the procurement cost on the one hand and the storage cost on the other hand. In addition, the subsequent turnover will increase the difficulty of turnover due to too many types. Summary of the Invention

[0004] The present invention solves the deficiencies of the prior art and provides a customized safety net that can be quickly hung and dismantled, which greatly improves the efficiency of hanging and dismantling the safety net, speeds up the construction progress, and saves construction costs.

[0005] To achieve the above purpose, the present invention first proposes a customized safety flat net that can be quickly hung and dismantled, which specifically includes the following steps:

[0006] a. Division of safety network units:

[0007] According to the design drawings, the area where the safety net needs to be hung is divided into multiple rectangular safety net units;

[0008] b. Security network unit grouping and setting:

[0009] The safety net units are numbered, and the safety net units with the same length and width are numbered with the same number. All the safety net units form n numbered net unit groups. Let the number of safety net units in the i-th numbered net unit group be M. i , suppose the width of the numbered flat grid unit group is BB i , length is LL i, i=1, 2, 3……n;

[0010] c. Safety flat net unit groups are sorted and grouped according to width:

[0011] Set the maximum width of the numbered flat mesh unit group to Max(BB), and compare Max(BB) with the width BB of other numbered flat mesh unit groups. i By comparing and calculating one by one through formula (1),

[0012]

[0013] The numbered flat network unit group whose calculation results satisfy formula (1) is taken as A j Group, the numbered flat network unit group whose calculation results do not meet formula (1) is regarded as group B; repeat step c for the numbered flat network unit groups in group B until all the numbered flat network unit groups are evenly divided into one A j Within a group, j is the number of times step c is repeated, j = 0, 1, 2, 3, ...;

[0014] d. Numbering flat network units are sorted and grouped by length:

[0015] Each A j The maximum length of the flat network unit group within the group is set to Max(LL), and Max(LL) is connected to the same A j The length LL of other numbered flat network unit groups in the group i By comparing and calculating one by one through formula (2),

[0016]

[0017] The numbered flat grid unit whose calculation result satisfies formula (2) is taken as A j A k Group, the numbered flat network units whose calculation results do not meet formula (1) are group B; repeat step d for the numbered flat network units in group B until all the numbered flat network unit groups are evenly divided into one A j A k Within a group, k is the number of times step e is repeated, k = 0, 1, 2, 3, ...;

[0018] e. Customize the safety flat net unit:

[0019] Find each A j A k The length and width of the group meet the requirements of the largest numbered flat mesh unit group, and the length and width of this numbered flat mesh unit group are used as the length and width of each A j A k Custom sizes of safety flat net units are available for each A j A k The number of all numbered flat network unit groups in the group Mi Add up and get each A j A k The total number of safety network units in the group M 总 , determine each A according to the design and construction progress j A k The number of areas that need to be constructed simultaneously in the group is q. 总 Set an estimated purchase value of s for the quantity, compare q and s, and the quantity of safety flat net units customized in each group of numbered flat net units is the larger value of q and s;

[0020] f. Install safety flat net unit.

[0021] In this embodiment, in step b, when numbering the safety net units, for the convenience of counting, all the safety net units are first arranged in order of width from largest to smallest.

[0022] In this embodiment, in step e, the estimated purchase value s=(1 / 4-1 / 3)M 总 .

[0023] In this embodiment, in step f, when installing the safety net unit, hooks are welded to the inner side of the lower portion of the steel beam, and the safety net is directly hung on the hooks, with the spacing between adjacent hooks no greater than 750 mm. Because traditional safety nets are secured to the structure via tethers, the number of tether nodes is very large, with a single factory building having up to thousands of such tether nodes, resulting in a high level of repetitive work. The tethering operation requires workers to raise both hands, which can easily tire them. Each tethering operation takes approximately one minute, resulting in low efficiency in both installing and removing the safety net.

[0024] Using the above method, hooks are welded on the inner side of the lower part of the steel beam. The spacing between the hooks is no more than 750 mm and they are evenly arranged around the direction of the safety net. The safety net is directly hung on the hooks without the need for tying. The hanging and removal work only requires one-handed operation by the worker, and the hanging and removal actions of each node only take about 10 seconds. "Hanging" takes much less time than "tying", so the efficiency of directly hanging the safety net on the hooks is much higher than fixing the safety net with ropes, thus saving a lot of construction time and costs.

[0025] In this embodiment, in step f, before hanging the customized safety net unit, the customized safety net unit is compared with the size of the corresponding construction area, and the length and / or width of the customized safety net unit is folded according to the size of the construction area, so that the size of the folded customized safety net unit matches the size of the construction area, and then the folded customized safety net unit is hung. Since the size of each safety net unit is customized, only one customized safety net is needed during the hanging work of each safety net unit, and there is no need to replace the safety net in the middle, and the hanging and removal efficiency of the safety net is higher, which can greatly save the construction period and cost.

[0026] By using the above method, the width, length and number of the safety net unit that needs to be customized can be directly obtained, and the intermediate link of "splicing" is saved during use; by grouping and merging the width and length of the safety net, the number and types of the customized safety net units can be greatly reduced, which facilitates the stacking, identification and use of the safety net, and enhances the versatility of the safety net; by welding a hook on the inner side of the lower part of the steel beam, the safety net unit can be directly hung on the hook, which is more efficient than the existing method of fixing the safety net unit by a tether; and since only one size of the customized safety net unit is used during the hanging process of each group of safety net units, there is no need to replace the safety net unit in the middle, and mechanical continuous operation is adopted, which can greatly improve the hanging and removal efficiency of the safety net unit and speed up the construction progress; and based on the customized size of the safety net unit, the grouping and merging of the customized safety net unit can be facilitated, so that the turnover use between different engineering projects and different factories can be facilitated. In summary, by using the above method, the hanging and removal efficiency of the safety net can be greatly improved, the construction progress can be accelerated, and the construction cost can be greatly saved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the plan layout of the 1# factory of the present application.

[0028] Figure 2 is the cross-sectional view at 1-1 in the present application. Figure 1

[0029] Figure 3 is the plan layout of the 2# factory of the present application.

[0030] Figure 4 is the cross-sectional view at 2-2 in the present application. Figure 2

[0031] Figure 5 is the process diagram of splicing a large size safety net from small size safety nets in the prior art. ​​

[0032] Figure 6 It is a structural schematic diagram of the customized safety flat net unit of the present invention.

[0033] Figure 7 This invention Figure 1 Cross-sectional view at point 3-3.

[0034] In the attached figure, 1. safety net unit; 2. steel beam; 3. hook; 4. steel column. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] like Figures 1 to 7 As shown, the present invention provides a customized safety flat net that can be quickly hung and removed.

[0038] A project generally includes multiple factory buildings. In this embodiment, a project including two factory buildings is used as an example for explanation.

[0039] like Figure 1 、 2 The figure shows the 1# plant. Figure 3 、 4 Shown is the 2# factory building.

[0040] This method has the following six key points:

[0041] 1. Division method of safety flat network unit:

[0042] For a factory building, first divide the factory building into multiple safety net units 1 that need to be protected by safety nets according to the design drawings, such as Figure 1 , 1# plant is divided into 1#, 2#, 3#, 4#, 5#, 6# six safety network units 1, such as Figure 3 The 2# factory building is divided into six safety network units: 7#, 8#, 9#, 10#, 11#, and 12#.

[0043] 2. Preliminary determination of the width and length of the customized safety net:

[0044] Based on the division results of the safety net unit 1, the width, length, and corresponding number of units to be protected are counted, thereby preliminarily determining the width, length, and corresponding number of the customized safety net. The width of the unit to be protected is the preliminary width of the safety net, and the length of the unit to be protected is the preliminary length of the safety net. The specific counting method is described below. The width, projected length, and oblique length of the unit to be protected are shown in the following table, which preliminarily determines the width and length of the customized safety net.

[0045] Table 1: Preliminary determination of the width and length of the customized safety net

[0046]

[0047] Note: The length of the unit to be protected is the oblique length along the inclination direction of the beam. The inclination is determined according to the actual project. The projected length of the unit to be protected is the projection of the oblique length on the horizontal plane. The oblique length and the projected length correspond one to one.

[0048] 3. Customize the grouping and merging method of the width and length of the safety flat net:

[0049] Since a project generally includes multiple factory buildings, the width and length of the safety net units in different factory buildings are often different. Through the preliminary list in steps 1 and 2, the safety net sizes are grouped and merged. Through this step 3, it can be prevented that there are many different widths (such as B1, B2, B3, B4, B5, B6 in Table 1) and projection lengths (such as L1, L3, L5, L7 in Table 1) in the prefabricated safety nets, which will result in too many safety net size specifications, inconvenience in storage and marking, inconvenience for workers to find, and time-consuming and labor-intensive.

[0050] (1) Take each row of data as a whole and sort by the width of the safety grid:

[0051] In Table 1, each row represents the relevant data of a unit. Taking "each row of data" as a whole, the preliminary width of the safety net is sorted from large to small. The other data in the row are adjusted accordingly with the sorting of the width. That is, after the preliminary width is sorted, it must be ensured that each row is the complete data of a unit.

[0052] For the sorted row data, we number them starting from 1 and write them in Table 2. For the sake of convenience, the initial width and initial projection length of the safety net in Table 2 are generally represented by symbols. The safety net units with the same length and width are numbered the same. Let the number of safety nets in row i be M. i .

[0053] Table 2: Data after sorting the preliminary dimensions of safety nets

[0054]

[0055]

[0056] (2) Grouping the width of the safety net:

[0057] The preliminary width of the safety net in Table 2 above has been arranged in descending order, with each row of data corresponding to a safety net unit, and each row of data being sorted and numbered as a whole.

[0058] The preliminary width of the safety net in the i-th row is BB i As a reference data, the preliminary width of the safety net in the i+1-th row is BB n Compare them, i = 1, 2, …, 11, and calculate all rows in Table 2 in turn, when the following condition is met:

[0059]

[0060] The n-th row of data and the i-th row of data are preliminarily grouped, and if not, they are grouped again. When grouping according to the above formula, the grouped data no longer participates in subsequent comparison and grouping until all data are grouped into a group.

[0061] Note: This step is only a preliminary grouping, and the final grouping still needs to be subdivided based on the projection length of the safety net on the basis of this preliminary grouping, see Step (3).

[0062] To illustrate the principle, after calculating the data in Table 2 according to the above formula, the following grouping results are obtained, the first 6 rows are preliminarily grouped into a group as shown in Table 3, and the 7th to 12th rows are preliminarily grouped into a group as shown in Table 4.

[0063] Table 3: Grouped data 1 after preliminary grouping of safety net

[0064]

[0065] The first 6 rows are grouped into the first group, and the width of the safety net in this group is the same, and the width of the safety net is taken as the maximum value of the preliminary width of the safety net from the first row to the sixth row.

[0066] The maximum width of the safety net in the first group = Max(BB i ) i = 1, …, 6

[0067] Table 4: Grouped data 2 after preliminary grouping of safety net

[0068]

[0069]

[0070] The 7th to 12th rows are divided into the second group. The width of the safety nets in this group is the same. The width of the safety net is the maximum value of the initial width of the safety nets from the 7th to 12th rows.

[0071] The maximum width of the second group of safety nets = Max(BB i )i=7,……12

[0072] The drooping height H of the safety net refers to the vertical height difference between the mid-span position of the safety net and the positions at both ends. Figure 2 The following table shows the corresponding droop height H1 when the safety net width is B1. When safety nets of different widths are grouped, each group only needs to purchase a safety net with the largest width. Figure 2 The safety net is installed in Figure 4 When in the middle, the corresponding drooping height is H2, and the difference in width does not affect the drooping height H.

[0073] (3) Group the lengths of the safety nets:

[0074] For Table 3, the initial projection length LL of the safety net in row i is i As a reference data, the initial projection length LL of the i+1th row of safety net n For comparison, let i = 1, ..., 5, and calculate all rows in Table 3 in turn. When the following is satisfied:

[0075]

[0076] The data in row n and row i are finally grouped together. If the condition is not met, grouping is repeated. When grouping is performed according to the above formula, the grouped data will no longer participate in subsequent comparisons and groupings until all data are grouped together.

[0077] To illustrate the principle, the data in Table 3 are calculated according to the formula, and the following results are obtained. Rows 1 to 3 are finally divided into Group 1 as shown in Table 5, and rows 4 to 6 are finally divided into Group 2 as shown in Table 6.

[0078] Table 5: Final grouping data of the security network 1

[0079]

[0080] The 1st to 3rd rows are finally divided into the 1st group. The length of the safety nets in this group is the same, and the projected length of the safety nets is the maximum value of the lengths from the 1st to 3rd rows.

[0081] The maximum length of the first group of safety nets = Max(LL i )i=1,……3

[0082] Table 6: Final grouping data of the security network 2

[0083]

[0084] The 4th to 6th rows are finally divided into the second group. The length of the safety nets in this group is the same, and the projected length of the safety nets is the maximum value of the lengths from the 4th to 6th rows.

[0085] The maximum length of the second group of safety nets = Max(LL i )i=4,……6

[0086] For Table 4, the initial projection length LL of the safety net in row i is i As a reference data, the initial projection length LL of the i+1th row of safety net n For comparison, i=7, 8, ..., 11, and all rows in Table 4 are calculated in sequence. When the following is satisfied:

[0087]

[0088] The data in row n and row i are finally grouped together. If the condition is not met, grouping is repeated. When grouping is performed according to the above formula, the grouped data will no longer participate in subsequent comparisons and groupings until all data are grouped together.

[0089] To illustrate the principle, the data in Table 4 are calculated according to the formula, and the following results are obtained. Rows 7 to 9 are finally divided into the third group as shown in Table 7, and rows 10 to 12 are finally divided into the fourth group as shown in Table 8.

[0090] Table 7: Final grouping data of the security network 3

[0091]

[0092] The 7th to 9th rows are finally divided into the third group. The length of the safety nets in this group is the same, and the projected length of the safety nets is the maximum value of the lengths from the 7th to 9th rows.

[0093] The maximum length of the third group of safety flat nets = Max(LL i )i=7,……9

[0094] Table 8: Final grouping data of the security network 4

[0095]

[0096] The 10th to 12th rows are finally divided into the 4th group. The length of the safety nets in this group is the same, and the projected length of the safety nets is the maximum value of the lengths from the 10th to 12th rows.

[0097] The maximum length of the fourth group of safety flat net = Max(LLi )i=10,……12

[0098] Through the above analysis, the width of the customized safety net in groups 1-4 is Max(BB i ), the length is Max(LL i ).

[0099] For example: Figure 2 The left side is a safety net with an oblique length of L2. Figure 2 The dotted box on the right is the unit to be protected with an oblique length of L4, L2>L4. When the safety net with an oblique length of L2 is hung at the position of the unit to be protected with an oblique length of L4, it is only necessary to fold the excess length L0 of the safety net to meet L4.

[0100] After the above three steps (1) to (3), the width and length of the safety flat network in this case after grouping and merging are only 4 groups.

[0101] 4. Design and layout of hanging points for safety nets:

[0102] Traditional safety nets are fixed to the structure with ropes. However, due to the large number of rope nodes, there can be thousands of such rope nodes in a factory building, which leads to a lot of repetitive work. The rope-tying action requires workers to raise both hands to operate, which makes them easily tired. In addition, each rope-tying action takes about 1 minute, so the efficiency of hanging and removing the safety net is low.

[0103] like Figure 7 As shown, in this method, hooks 3 are welded on the inner side of the lower part of the steel beam. The spacing between the hooks 3 is no more than 750 mm and they are evenly arranged around the direction of the safety net arrangement. The safety net is directly hung on the hooks without the need for a tying operation. The hanging and removal work only requires one-handed operation by the worker, and the hanging and removal actions of each node only take about 10 seconds. "Hanging" takes much less time than "tying", so the efficiency of directly hanging the safety net on the hooks is much higher than that of fixing the safety net with a tying rope, thereby saving a lot of construction time and costs.

[0104] 5. How to quickly install and remove customized safety nets:

[0105] like Figure 2As shown in the figure, when the safety net is hung, two straight-arm aerial work vehicles (or articulated-arm aerial work vehicles) are used as mechanical equipment for workers to climb up and operate when hanging and removing the safety net. The workers on the two straight-arm aerial work vehicles (or articulated-arm aerial work vehicles) respectively hold one end of the safety net and hang or remove it synchronously along the hanging direction. There are two workers on each straight-arm aerial work vehicle (or articulated-arm aerial work vehicle), one of whom is responsible for holding the safety net, and the other is responsible for hanging the safety net as shown in the figure. Figure 7 After each hanging, workers on two straight-arm aerial work vehicles (or articulated-arm aerial work vehicles) drive the straight-arm vehicles in the direction of the hook to the next hanging point. The construction workers use the same method to hang the safety net until all the safety net hanging points are hung.

[0106] Since the size of the safety net units in each group is the same, if the construction progress permits, only one customized safety net can be set up during the installation or removal of each group of safety net units, which can be folded to adapt to different protection areas. In this way, there is no need to replace the safety net in the middle, and a straight-arm aerial work vehicle (or curved-arm aerial work vehicle) is used for mechanized continuous operation, which greatly improves the efficiency of hanging and removing the net, and can greatly save construction time and costs.

[0107] 6. Methods to improve the turnover rate of customized security flat network:

[0108] Based on the customized size of the safety net and the grouping and merging of the customized safety net sizes, the types of width and length sizes of the safety net are greatly reduced, thereby improving the versatility of the safety net and enhancing the adaptability of the safety net when used in different factories.

[0109] As shown in Tables 5, 6, 7, and 8, the original 12 sizes of safety nets have been grouped and merged to only 4 sizes, which greatly reduces the size types of safety nets and improves the versatility of safety nets. The following table shows the width, projected length, and quantity of safety nets after grouping and merging.

[0110] Table 9: Security flat network grouping after merging

[0111]

[0112] Due to the high risk of working at height, the safety net must be fully hung. According to conventional practice, the purchase quantity of the safety net must also be purchased according to the full hanging quantity. However, since multiple factories in a project are not necessarily constructed at the same time, the construction progress requirements of each factory are not necessarily the same, and the units that need to be protected during the construction of each layer of the structure can be constructed at staggered times to achieve turnover use and thus save the purchase quantity of safety nets.

[0113] Install safety nets in different workshops of different engineering projects (such as Figure 1 、 3 The specific turnover method is as follows:

[0114] Figure 1 This is the floor plan of the 1# plant. Figure 3 This is the floor plan of Building 2. According to the data in Table 9, if the turnover of safety nets is not considered, the total number of safety nets to be purchased is:

[0115] M1+M2+M3+M4+M5+M 6+ M7+M8+M 9+ M 10 +M 11 +M 12 ,

[0116] When considering the turnover of safety nets, we assume that the total construction period for the roofs of factory buildings 1# and 2# is 3 months. The number of safety nets required for the roofs under construction at the same time each month is:

[0117] 1 / 3(M1+M2+M3+M4+M5+M 6+ M7+M8+M 9+ M 10 +M 11 +M 12 ),

[0118] When considering the turnover of the safety net, after the construction of the current month is completed, the safety net will be turned over to the next month for continued use. The turnover rate of the safety net is 66.66%. The purchase quantity of the safety net is:

[0119] 1 / 3(M1+M2+M3+M4+M5+M 6+ M7+M8+M 9+ M 10 +M 11 +M 12 ),

[0120] In fact, it is not common for all factory buildings to be constructed at the same time in the same project. The construction progress of different factory buildings is often separated by a period of time, so the actual turnover rate of safety nets will be higher. Technical personnel are required to determine the purchase quantity of safety nets according to the above method.

[0121] In summary, a method for quickly hanging and dismantling customized safety nets can save more than 66.66% of safety net materials, save more than 70% of the total cost of hanging and dismantling safety nets, and improve the efficiency of hanging and dismantling safety nets by more than 70%.

[0122] Example:

[0123] The above method is explained below based on actual case data.

[0124] 1. Division method of safety flat network unit:

[0125] As attached Figure 1 As shown in the figure, there are 4 rows of steel columns along the beam span direction of the factory building, with 3 steel columns in each row, and a total of 4 rows of steel beams. The area enclosed by steel column 2 and steel beam 4 is the unit that needs to be protected. Figure 1 , 1# plant is divided into 1#, 2#, 3#, 4#, 5#, and 6# units to be protected, such as Figure 3 , the 2# factory building is divided into 7#, 8#, 9#, 10#, 11#, and 12# protection units.

[0126] For the case where the steel beam is inclined, such as Figure 1 , the projection length of the unit to be protected is L1, and the oblique length of the unit to be protected is L2.

[0127] 2. Preliminary determination of the width and length of the customized safety net

[0128] like Figure 5 This is a schematic diagram of the splicing of the safety flat net when the customized safety flat net technology is not used. For the 1# unit to be protected in the 1# plant (such as Figure 1 As shown), the width is 8.7m, the projected length is 28m, the safety flat net purchased on the market is 3m wide and 6m long. Figure 5 The arrangement requires 15 small-sized safety nets (3m wide and 6m long) to be spliced ​​into a large safety net with a width of 9m and a projected length of 30m. There are a total of 3m×3×4 horizontal splicing seams = 36m, and a total of 6m×5×2 vertical splicing seams = 60m. Obviously, it takes a lot of time and cost to splice these seams.

[0129] To avoid the above problems, the width and length of the safety net units that need to be protected in the statistical drawings can be used to directly customize the width and length of the safety net, as shown in the table below.

[0130] Table 10: Preliminary determination of the width and length of the customized safety net (unit: mm)

[0131]

[0132]

[0133] 3. Customize the grouping and merging method of the width and length of the security flat network

[0134] (1) Take each row of data as a whole and sort it by the width of the security grid

[0135] In Table 10, each row represents the relevant data for a unit. Taking each row of data as a whole, sort the preliminary widths of the safety nets from largest to smallest. Data such as the preliminary projection lengths of the safety nets are sorted along with the widths to ensure that each row represents a complete set of data for each unit. The sorted rows of data are numbered starting with 1 and recorded in the table below.

[0136] Table 11: Data after sorting the preliminary dimensions of safety nets (unit: mm)

[0137]

[0138]

[0139] (2) Group the width of the safety net

[0140] The preliminary widths of the safety nets in Table 11 above have been arranged in descending order. Each row of data corresponds to a safety net unit, and each row of data is sorted and numbered as a whole.

[0141] Take the initial width BB of the safety net in row i i As a reference data, the initial width BB of the safety net in row i+1 n For comparison, i=1, 3, ..., 11, and all rows in Table 10 are calculated in sequence. When the following is satisfied:

[0142]

[0143] The data in the nth row and the data in the ith row are initially grouped together, otherwise they need to be grouped separately.

[0144]

[0145] The 1st to 12th rows are divided into a group. The width of the safety net in this group is the same. The width of the safety net is the maximum value of the widths from the 1st to 12th rows.

[0146] Width of safety net = Max(BBi) = 8700mm i = 1, ... 12

[0147] Table 12: Grouping data after preliminary grouping of safety flat net (unit: mm)

[0148]

[0149]

[0150] (3) Group the length of the safety net

[0151] The preliminary projection length LL of the i-th row of safety net in Table 12 i The preliminary projection length LL of the i-th + 1 row of safety net as reference data n Comparing with the above, i = 1, 3, …, 5, all rows in Table 11 are calculated in turn, and when the following condition is met:

[0152]

[0153] If the n-th row of data and the i-th row of data are finally grouped together, otherwise they need to be separately grouped.

[0154]

[0155] The first to twelfth rows are grouped together, and the length of the safety net in this group is the same. The length of the safety net is the maximum length from the first row to the twelfth row.

[0156] The length of the safety net = Max (LL i ) = 28000mm i = 1, …, 12

[0157] Table 13: Final grouping data of safety net (unit: mm)

[0158]

[0159]

[0160] After the above three steps (1) to (3), the width and length of the grouped and merged safety net in this case are only one group, i.e. the width of the safety net is 8700mm and the length is 28000mm.

[0161] As shown in the left side of Figure 2 , the projection length of the safety net is 28m, and as shown in the right side of Figure 2 , the dashed box in the right side is the protection unit with a projection length of 24m. When the safety net with a projection length of 28m is hung at the position of the protection unit with a projection length of 24m, the excess length of 4m of the safety net can be overlapped in the 24m area as shown in Figure 2 , i.e. 28m > 24m, the safety net meets the hanging and protection requirements, which is the reason for grouping the length.

[0162] 4. Hanging point design and arrangement method of safety net

[0163] As shown in Figure 6 , the hanging point of the safety net is arranged at the lower part of the beam. For H-shaped steel beam, a hook can be welded inside the lower part of the steel beam, and the safety net is directly hung on the hook.

[0164] As shown in Figure 1As shown in the 1# unit of the 1# factory building, hooks are arranged along the width and length of the safety net unit, and the spacing between the hooks is not more than 750mm and they are evenly arranged.

[0165] 5. How to quickly install and remove custom safety nets

[0166] like Figure 7 As shown, hooks are welded on the inner side of the lower part of the steel beam. The spacing between the hooks is no more than 750mm and they are evenly arranged around the direction of the safety net. The safety net is directly hung on the hooks without the need for a tying operation. The hanging and removal work only requires one-handed operation by the worker, and the hanging and removal action of each node takes only about 10 seconds. Therefore, the efficiency of directly hanging the safety net on the hook is much higher than that of fixing the safety net with a tying rope, thus saving a lot of construction time and cost.

[0167] 6. Methods to improve the turnover rate of customized security flat network

[0168] Based on the customized size of the safety net and the grouping and merging of the customized safety net sizes, the types of width and length sizes of the safety net are greatly reduced, thereby improving the versatility of the safety net and enhancing the adaptability of the safety net when used in different factories.

[0169] like Figure 1 、 3 As shown in the figure, when only the safety net is considered to be circulated between different factories within a project, the turnover rate of the safety net can be 67%. For example, for a 10,000 square meter factory, only about 3,300 square meters of safety net needs to be purchased, and the remaining 6,700 square meters of factory can be used through turnover.

[0170] When considering the safety net's rotation between different factories in two projects, the safety net's turnover rate can reach 84%.

[0171] When considering that the safety net is used in rotation among more projects, the turnover rate will be higher, which will save more material costs and construction costs of the safety net.

[0172] In summary, a method for quickly hanging and dismantling customized safety nets can save more than 67% of safety net materials, save more than 70% of the total cost of hanging and dismantling safety nets, and improve the efficiency of hanging and dismantling safety nets by more than 70%.

[0173] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A custom safety net that can be quickly installed and removed, characterized by: The specific steps include: a. Division of safety network units: According to the design drawings, the area where the safety net needs to be hung is divided into multiple rectangular safety net units; b. Security network unit grouping and setting: The safety net units are numbered, and the safety net units with the same length and width are numbered with the same number. All the safety net units form n numbered net unit groups. Let the number of safety net units in the i-th numbered net unit group be M. i , suppose the width of the numbered flat grid unit group is BB i , length is LL i , i=1, 2, 3...n; c. Safety flat net unit groups are sorted and grouped according to width: Set the width BB of the i-th flat mesh unit group i As a reference data, the width BB of the i+1th flat mesh unit group i+1 Compare with the reference data and compare all numbered flat network unit groups in turn; （1）； The numbered flat network unit group whose calculation results satisfy formula (1) is taken as A j Group, the numbered flat network unit group whose calculation results do not meet formula (1) is regarded as group B; repeat step c for the numbered flat network unit groups in group B until all the numbered flat network unit groups are evenly divided into one A. j Within a group, j is the number of times step c is repeated, j = 0, 1, 2, 3, ...; d. Numbered flat network units are sorted and grouped by length: Each A j The length LL of the i-th row of the flat network unit group within the group i As a reference data, the initial projection length LL of the i+1th row of safety net i+1 Compare with the reference data and compare all numbered flat network unit groups in the group in turn; （2）； The numbered flat grid unit whose calculation result satisfies formula (2) is taken as A j A k Group, the numbered flat network units whose calculation results do not satisfy formula (2) are group C; repeat step d for the numbered flat network units in group C until all the numbered flat network unit groups are evenly divided into one A j A k Within a group, k is the number of times step e is repeated, k = 0, 1, 2, 3, ...; e. Customize the safety flat net unit: Find each A j A k The length and width of the group meet the requirements of the largest numbered flat mesh unit group, and the length and width of this numbered flat mesh unit group are used as the length and width of each A j A k Custom sizes of safety flat net units are available for each A j A k The number of all numbered flat network unit groups in the group M i Add up and get each A j A k The total number of safety network units in the group M 总 , determine each A according to the design and construction progress j A k The number of areas that need to be constructed simultaneously in the group is q. 总 Set an estimated purchase value of s for the quantity, compare q and s, and the quantity of safety flat net units customized in each group of numbered flat net units is the larger value of q and s; f. Install safety net unit.

2. The customized safety net that can be quickly hung and removed according to claim 1 is characterized by: In step b, when numbering the safety net units, for the convenience of counting, all the safety net units are first arranged in order of width from largest to smallest.

3. The customized safety net that can be quickly hung and removed according to claim 1 is characterized by: In step e, the estimated purchase value s = (1 / 4 to 1 / 3) M 总 .

4. The customized safety net that can be quickly hung and removed according to claim 1 is characterized by: In step f, when hanging the safety net unit, a hook is welded on the inner side of the lower part of the steel beam, and the safety net is directly hung on the hook.

5. The customized safety net that can be quickly hung and removed according to claim 4 is characterized by: The distance between adjacent hooks shall not exceed 750mm.

6. The customized safety net that can be quickly hung and removed according to claim 4 is characterized by: In step f, before hanging the customized safety net unit, compare the customized safety net unit with the corresponding construction area size, and fold the length and / or width of the customized safety net unit according to the size of the construction area so that the size of the folded customized safety net unit matches the size of the construction area, and then hang the folded customized safety net unit.

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