Folding construction method for a limited-space cylindrical latticed shell

Abstract

The application discloses a kind of restricted space cylindrical latticed shell folding construction methods, it is related to restricted space cylindrical latticed shell folding construction technical field, technical scheme is, by jacking up " after being reduced overall latticed shell structure " through restricted space to initial installation height, after not being limited by space, again by the way of stepped jacking, each folding part latticed shell is sent to design height layer by layer, and " unfolding " is carried out.The beneficial effects of the application are: compared with high-altitude bulk method, the safety of workers high-altitude operation is reduced, and the safety of personnel construction is improved;By folding, the work site required by the latticed shell structure can be reduced, meeting the requirements of restricted space construction;The latticed shell structure unit division has no fixed mode, and the corresponding folding method is also different, and the construction flexibility is good.

Description

Technical Field

[0001] This invention relates to the field of confined space cylindrical reticulated shell folding construction technology, and particularly to a confined space cylindrical reticulated shell folding construction method. Background Technology

[0002] Grid shell structures are spatial grid structures composed of rods arranged according to certain rules. They are characterized by high stiffness, small deformation, and structural stability, making them an ideal choice for large-span spatial structures. Currently, commonly used construction methods for grid shell structures include high-altitude assembly, sliding, integral hoisting, jacking, and lifting methods.

[0003] However, due to limitations in on-site construction conditions or overlapping procedures, existing construction methods have some limitations under certain conditions. On the one hand, the site space is limited and does not meet the conditions for overall installation; on the other hand, there are many unsafe factors for workers working at heights.

[0004] The main problems with existing technologies are as follows:

[0005] Risks of working at height: Traditional construction methods for reticulated shell structures, such as the high-altitude bulk assembly method, require workers to operate at heights, which increases safety risks.

[0006] Site limitations: For construction sites with limited space, such as those with limited space below, the overall hoisting or sliding method may not be feasible, as these methods require a large site space to complete the assembly and movement of the structure.

[0007] Construction efficiency: Construction in a confined space may result in reduced efficiency due to overlapping work processes and site limitations.

[0008] Structural stability: Improper handling during the removal of some members or the installation of temporary hinges may affect the stability of the grid shell structure.

[0009] The present invention aims to solve these problems and improve the safety and efficiency of construction. Summary of the Invention

[0010] In order to achieve the above-mentioned objectives and address the above-mentioned technical problems, the present invention provides a method for constructing a confined space cylindrical reticulated shell by folding.

[0011] The technical solution includes the following steps:

[0012] S1. Division of reticulated shell structure units

[0013] Based on the characteristics of the reticulated shell, the reticulated shell structure is divided into several identical reticulated shell structure units.

[0014] To ensure that the reticulated shell structure units are as symmetrical and regular as possible, so as to facilitate uniform stress distribution in the later stage, the geometry must also be considered, and it must be foldable. For example, if it is curved or has a certain curvature, it may not be able to be bent.

[0015] S2, folding and assembly of reticulated shell structure

[0016] The reticulated shell structural units are folded in several segments along the radial direction of the reticulated shell to reduce the span and projected area of ​​the reticulated shell structure.

[0017] Each reticulated shell structural unit is folded into several folded segments;

[0018] After folding, the span and projected area of ​​the reticulated shell structure are greatly reduced, thus meeting the overall lifting requirements in a confined space.

[0019] S3, Temporary support and fixation of the reticulated shell structure

[0020] Adjacent folded segments of rods are temporarily fixed by tie rods, and the connection point between the tie rod and the two rods, as well as the hinge point between the two rods, form the three vertices of a triangle;

[0021] Since the folding sections are achieved by hinges or by removing some of the rods, the folding sections are a movable system and need to be fixed by a certain number of tie rods to prevent the structure from becoming unstable during subsequent jacking operations.

[0022] S4, First Overall Lifting

[0023] The jacking point is set, and the selection of the jacking point is based on the innermost side closest to the center of the shell as the first stage jacking point, and then continues outward as the second stage jacking point, the third stage jacking point, and so on.

[0024] During the initial overall jacking, the folded mesh shell is jacked up to the initial installation height above the support column using the jacking device, according to the jacking point setting.

[0025] S5, Multi-step staged lifting and top hoisting

[0026] 1) After the initial overall jacking reaches the initial installation height, the first-stage jacking point will no longer participate in the jacking during the second jacking, and the second-stage jacking point will be jacked.

[0027] 2) During the jacking process, lifting points are simultaneously applied to the upper part to bear part of the weight of the shell, reduce the jacking resistance, and stabilize the structure.

[0028] S6, Achieve design height for support and fixation.

[0029] Once the reticulated shell structure reaches the designed height, i.e., the folded reticulated shell is fully unfolded, temporary supports are applied for fixation and connection to the main structure is made.

[0030] S7. Form a complete structural system.

[0031] In step S1, several of the reticulated shell structural units are centrally symmetrically distributed about the center of the reticulated shell.

[0032] In step S2, all folding segments are completed by hinges between members or by removing some members. The members are then hinged to become rigid nodes or filler members.

[0033] In step S4, the lifting points of the same position of the folded segments that are equidistant from the center of the shell are on the same horizontal plane in the radial direction.

[0034] In step S5, if there are other lifting points in the folded segments according to the grid shell structure unit division in step S1, then repeat the principle of this step and lift them in stages according to height until they are fully unfolded.

[0035] In step S7, the missing members removed in step S2 are replaced or the hinged connections between members are converted into rigid connections to form a complete structural system.

[0036] The folding and assembly of a grid shell involves dividing the structure into structural units and folding and assembling the grid shell structure by removing some members or setting hinges.

[0037] Temporary support and fixation of the reticulated shell is a temporary support and reinforcement measure taken after the folding and assembly is completed to prevent the subsequent lifting structure from becoming unstable.

[0038] The first overall jacking is to lift the structure to the initial installation height of the column surface after the grid shell is folded and assembled.

[0039] Multi-step staged jacking and hoisting involves stopping the jacking of the first section of the space frame after the structure reaches the initial installation height of the column surface, and then jacking the second section and the rest of the space shell. At the same time, lifting points are set at the top to assist in jacking and stabilize the structure. After reaching the installation height of the second section, the jacking of the second section stops, and the third section and the rest of the space shell are then jacked, and so on, depending on the number of folds, until the design height is reached.

[0040] Once the design height is reached, the structure is supported and fixed, missing members are added, or hinged points are converted into rigid nodes to form a complete grid shell structure system.

[0041] Based on the case study of the folding, unfolding, and lifting construction of the dry coal shed shell structure at Yahekou Power Plant in Nanyang, Henan, this invention transforms the entire shell structure into a foldable, variable mechanism that can be assembled on the ground by removing some of the shell structure members or setting temporary hinges, thereby meeting the overall construction requirements of confined spaces.

[0042] However, it should be noted that this case only satisfies the requirement of folding and unfolding the reticulated shell structure. In terms of lateral space, the lateral spacing of the reticulated shell structure is not reduced after folding. For example: Figure 1 The width of the reticulated shells a and b does not change after folding, so they are not suitable for reticulated shell structures with limited space at the bottom.

[0043] Therefore, the present invention aims to develop a method for further reducing the span of a mesh shell structure within a confined space by using the principle of folding mesh, thereby meeting the overall construction requirements.

[0044] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: This solution provides a method for constructing a folded reticulated shell in a confined space, which is suitable for the construction of reticulated shell structures with large spans and long column spacings. The reticulated shell structure is constructed as a whole by folding and splicing in the lower confined space. The "reduced overall reticulated shell structure" is lifted through the confined space to the initial installation height by jacking. After the space is no longer restricted, the folded reticulated shell parts are then sent to the design height layer by layer by jacking in a step-by-step manner for "unfolding". This method can reduce the span of the reticulated shell structure without increasing the lateral spacing, making it more suitable for construction in confined spaces.

[0045] The reticulated shell structure can be divided into units according to the principles of symmetry and regularity, but there is no fixed form, and it is highly flexible.

[0046] Based on the divided structural units, the grid shell structure can be folded and installed as a whole by hinges or by removing certain members, which can greatly reduce the working area and thus meet the requirements for construction in confined spaces.

[0047] Depending on the height of the reticulated shell structure, a combination of "upward pulling and downward lifting" is adopted. That is, the lower part is lifted in stages at different heights according to the folding of the reticulated shell, while the upper part is assisted in folding and unfolding the reticulated shell by setting up lifting points.

[0048] Compared with methods such as high-altitude bulk assembly, folding and assembling the reticulated shell structure on the ground greatly reduces the need for high-altitude operations, reduces the number of workers working at heights, and improves the safety of construction personnel.

[0049] Ground assembly can reduce on-site construction time, improve construction efficiency, and also facilitate construction management and quality control;

[0050] Folding can reduce the construction work area required for the grid shell structure, thus meeting the requirements for construction in confined spaces.

[0051] There is no fixed pattern for dividing the reticulated shell structure into units, and the corresponding folding methods are also different, which allows for good construction flexibility. Attached Figure Description

[0052] Figure 1The construction principle of folding and unfolding the shell structure of the dry coal shed at Yahekou Power Plant in Nanyang, Henan Province.

[0053] Figure 2 This is a diagram illustrating the construction effect of folding the mesh shell according to an embodiment of the present invention.

[0054] Figure 3 This is a schematic diagram of the staged lifting process in an embodiment of the present invention.

[0055] Figure 4 This is a top view of the reticulated shell structure and a schematic diagram of the structural unit division according to an embodiment of the present invention.

[0056] Figure 5 This is a diagram showing the assembled and completed mesh shell structure according to an embodiment of the present invention.

[0057] Figure 6 This is a schematic diagram of the temporary support and fixing measures in an embodiment of the present invention.

[0058] Figure 7 This is a diagram showing the distribution of the lifting points of the folded mesh shell in an embodiment of the present invention.

[0059] Figure 8 This is a schematic diagram of the first overall lifting of the folded mesh shell according to an embodiment of the present invention.

[0060] Figure 9 This is a schematic diagram of the second stage of partial jacking and surrounding hoisting in an embodiment of the present invention.

[0061] Figure 10 This is a schematic diagram of the staged lifting mechanism in an embodiment of the present invention.

[0062] Figure 11 This is a flowchart of the construction steps in an embodiment of the present invention.

[0063] The attached diagram is labeled as follows: 1. Reticulated shell structural unit; 2. Folded segment; 3. Rod; 4. Tie rod; 5. Lifting device; 6. Support column; 7. Lifting point;

[0064] • Indicates the peak point, This indicates a horizontal connection. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0066] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0068] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0069] Example 1

[0070] See Figures 1 to 11 This invention provides a method for constructing a confined space cylindrical reticulated shell by folding, comprising the following steps:

[0071] S1. Division of reticulated shell structure units

[0072] Based on the condition of the reticulated shell, the reticulated shell structure unit 1 is divided into several identical reticulated shell structure units 1.

[0073] To ensure that the reticulated shell structure unit 1 is as symmetrical and regular as possible, so as to facilitate uniform stress distribution in the later stage, the geometry must also be considered, and it must be foldable. For example, if it is curved or has a certain curvature, it may not be able to be bent.

[0074] Dividing the reticulated shell structure into multiple identical units can simplify construction and design.

[0075] Symmetrical and regular unit structures exhibit uniform stress distribution and good stability.

[0076] S2, folding and assembly of reticulated shell structure

[0077] The reticulated shell structure unit 1 is folded in several segments along the radial direction of the reticulated shell to reduce the span and projected area of ​​the reticulated shell structure.

[0078] Each reticulated shell structural unit 1 is folded into several folded segments 2;

[0079] After folding, the span and projected area of ​​the reticulated shell structure are greatly reduced, thus meeting the overall lifting requirements in a confined space.

[0080] S3, Temporary support and fixation of the reticulated shell structure

[0081] The rods 3 of adjacent folded segments 2 are temporarily fixed by tie rods 4. The connection point between tie rod 4 and the two rods 3, as well as the hinge point between the two rods 3, form the three vertices of a triangle.

[0082] Since folding section 2 is achieved by hinges or the removal of some rods, folding section 2 is a movable system and needs to be fixed by a certain number of tie rods to prevent structural instability during subsequent jacking operations.

[0083] By fixing adjacent folded segments together with tie rods, the overall stiffness and stability of the reticulated shell structure can be improved.

[0084] The triangular structure has good stability and can prevent the grid shell structure from tilting or deforming during the jacking process;

[0085] S4, First Overall Lifting

[0086] Set up 7. The selection of 7 is based on the innermost part of the center of the shell as the first stage jacking point, and then continues outward as the second stage jacking point, the third stage jacking point, and so on.

[0087] During the initial overall lifting, the folded mesh shell is lifted to the initial installation height above the support column 6 using the lifting device 5, according to the lifting point 7. As shown in the figure, · indicates the lifting point. This indicates a horizontal connection, which serves a stabilizing function;

[0088] S5, Multi-step staged lifting and top hoisting

[0089] 1. After the initial overall jacking reaches the initial installation height, the first-stage jacking points will no longer participate in the second jacking; instead, the second-stage jacking points will be used for jacking. Figure 7 As shown in the vertex distribution, the inner circle vertices no longer rise, while the outer vertices undergo a second stage of rising.

[0090] 2. During the jacking process, lifting points are simultaneously applied to the upper part to bear part of the weight of the mesh shell, reduce the jacking resistance, and stabilize the structure.

[0091] Multi-step staged jacking can lift the grid shell structure to a specified height in stages, avoiding excessive deformation of the grid shell structure during the jacking process;

[0092] The lifting points can bear part of the weight of the reticulated shell, reduce the lifting resistance, and play a role in stabilizing the structure;

[0093] S6, Achieve design height for support and fixation.

[0094] Once the reticulated shell structure reaches its designed height, the folded reticulated shell is fully unfolded and secured with temporary supports to connect it to the main structure. This ensures that the reticulated shell structure can operate stably after reaching its designed height. Through support and fixation, the load of the reticulated shell structure can be transferred to the main structure, and displacement or deformation of the reticulated shell structure can be prevented.

[0095] Apply temporary supports: Temporary supports are installed around the perimeter of the grid shell structure to support its weight. These temporary supports can take the form of brackets, columns, etc.

[0096] Connection to the main structure: Connect the grid shell structure to the main structure, making the grid shell structure an integral part of the main structure. Connection methods can include welding, bolting, etc.

[0097] S7. Form a complete structural system.

[0098] In step S1, several reticulated shell structural units 1 are centrally symmetrically distributed about the center of the reticulated shell.

[0099] In step S2, all folded segments 2 are completed by hinges between members or by removing some members. Subsequently, the members are hinged to become rigid nodes or filler members.

[0100] In step S4, in the radial direction, the lifting points 7 of the same position of the folded segments 2, which are equidistant from the center of the shell, are on the same horizontal plane.

[0101] In step S5, if there are other lifting points in folded segment 2 according to the division of the shell structure unit in step S1, then repeat the principle of this step and lift in stages according to height until it is fully unfolded.

[0102] In step S7, the missing members removed in step S2 are replaced or the hinged connections between members are converted into rigid connections to form a complete structural system.

[0103] like Figure 2 As shown, the projected area of ​​the mesh shell shows that folding it can reduce the working area required for construction, thus meeting the needs of confined space operations.

[0104] like Figure 3As shown, after the reticulated shell is folded, it is lifted in stages according to the height of each section and the setting of the top. The top is assisted by hoisting, which can share part of the weight and achieve the purpose of stabilizing the structure.

[0105] The folding and assembly of a grid shell involves dividing the structure into structural units and folding and assembling the grid shell structure by removing some members or setting hinges.

[0106] Temporary support and fixation of the reticulated shell is a temporary support and reinforcement measure taken after the folding and assembly is completed to prevent the subsequent lifting structure from becoming unstable.

[0107] The first overall jacking is to lift the structure to the initial installation height of the column surface after the grid shell is folded and assembled.

[0108] Multi-step staged jacking and hoisting involves stopping the jacking of the first section of the space frame after the structure reaches the initial installation height of the column surface, and then jacking the second section and the rest of the space shell. At the same time, lifting points are set at the top to assist in jacking and stabilize the structure. After reaching the installation height of the second section, the jacking of the second section stops, and the third section and the rest of the space shell are then jacked, and so on, depending on the number of folds, until the design height is reached.

[0109] Once the design height is reached, the structure is supported and fixed, missing members are added, or hinged points are converted into rigid nodes to form a complete grid shell structure system.

[0110] The present invention relates to a method for constructing a folded cylindrical reticulated shell in a confined space. The main principle is as follows: the reticulated shell structure is constructed as a whole by folding and splicing in the lower confined space. The "reduced overall reticulated shell structure" is lifted through the confined space to the initial installation height by jacking. After the space is no longer restricted, the folded reticulated shell parts are then lifted layer by layer to the design height by step-by-step jacking for "unfolding".

[0111] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for constructing a confined space cylindrical reticulated shell by folding, characterized in that, Includes the following steps: S1. Division of reticulated shell structure units The reticulated shell structure unit (1) is divided according to the reticulated shell situation, and the reticulated shell is divided into several identical reticulated shell structure units (1); S2, folding and assembly of reticulated shell structure The reticulated shell structure unit (1) is folded in several segments along the radial direction of the reticulated shell to reduce the span and projected area of ​​the reticulated shell structure. Each shell structure unit (1) is folded into several folded segments (2); S3, Temporary support and fixation of the reticulated shell structure The members (3) of adjacent folded segments (2) are temporarily fixed by tie rods (4). The connection point of tie rod (4) with the two members (3) and the hinge point between the two members (3) form the three vertices of a triangle. S4, First Overall Lifting Set up the lifting point (7). The selection of the lifting point (7) is to take the innermost side closest to the center of the shell as the first stage lifting point, and continue outwards as the second stage lifting point, the third stage lifting point, and so on. During the initial overall lifting, the folded mesh shell is lifted to the initial installation height above the support column (6) by the lifting device (5) according to the lifting point (7). S5, Multi-step staged lifting and top hoisting 1) After the initial overall jacking reaches the initial installation height, the first-stage jacking point will no longer participate in the jacking during the second jacking, and the second-stage jacking point will be jacked. 2) During jacking, lifting points are simultaneously applied to the upper part; S6, Achieve design height for support and fixation. Once the reticulated shell structure reaches the designed height, i.e., the folded reticulated shell is fully unfolded, temporary supports are applied for fixation and connection to the main structure is made. S7. Form a complete structural system.

2. The confined space cylindrical reticulated shell folding construction method according to claim 1, characterized in that, In step S1, several of the reticulated shell structural units (1) are centrally symmetrical about the center of the reticulated shell.

3. The confined space cylindrical reticulated shell folding construction method according to claim 1, characterized in that, In step S2, all folded segments (2) are completed by hinges between members or by removing some members. The members are then hinged to become rigid nodes or filler members.

4. The confined space cylindrical reticulated shell folding construction method according to claim 1, characterized in that, In step S4, the lifting points (7) of the same position of the folded segments (2) that are equidistant from the center of the shell are on the same horizontal plane.

5. The confined space cylindrical reticulated shell folding construction method according to claim 1, characterized in that, In step S5, if there are other lifting points in the folded segment (2) according to the division of the shell structure unit in step S1, then repeat the principle of this step and lift in stages according to height until fully unfolded.

6. The confined space cylindrical reticulated shell folding construction method according to claim 1, characterized in that, In step S7, the missing members removed in step S2 are replaced or the hinged connections between members are converted into rigid connections to form a complete structural system.

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