Large-span reticulated shell structure construction method

Abstract

The invention provides a construction method for a large-span reticulated shell structure. The construction method comprises the steps that a prefabricated middle section reticulated shell, a first side span reticulated shell and a second side span reticulated shell are hoisted to corresponding preset positions, wherein the first side span reticulated shell and the second side span reticulated shell are located on the two sides of the middle section reticulated shell; the two sides of the middle section reticulated shell are in butt joint and connected with the first side span reticulated shell and the second side span reticulated shell correspondingly; the middle section reticulated shell, the first side span reticulated shell and the second side span reticulated shell are synchronously and preliminarily unloaded; and the middle section reticulated shell, the first side span reticulated shell and the second side span reticulated shell are precisely unloaded in a staged mode, inspection is conducted, and therefore construction of the large-span reticulated shell structure is completed. According to the construction method of the large-span reticulated shell structure, the problems that an existing unloading method of the large-span reticulated shell structure is low in precision and has safety risks can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and more specifically, to a construction method of a large-span lattice shell structure. Background Art

[0002] The grid shell roof is referred to as the grid shell structure. The grid shell structure is a mesh shell structure, a lattice shell, or a curved grid structure. The grid shell structure has the advantages of both the flat grid structure and the thin shell structure, with simple construction and construction methods, beautiful shape, and reasonable force. The grid shell structure is composed of a large number of small units in triangles or other shapes, and is usually used in buildings that require beautiful appearance and large-span space coverage, such as stadium domes, large exhibition halls, theaters, etc.

[0003] With the development of construction technology, large-span lattice shell structures (generally composed of multiple lattice shell structure segments) have been widely used in large public buildings such as gymnasiums and exhibition halls due to their unique shape, good mechanical performance and space utilization. However, during the installation of such structures, especially in the stage of segmented hoisting and connecting in the air, how to safely and efficiently achieve unloading (unloading) has become a technical problem in construction.

[0004] Traditional unloading methods for large-span lattice shell structures often make it difficult to accurately control the synchronization of the unloading amount of each hanging point and the structural deformation of the entire large-span lattice shell structure, which poses a safety risk and may even cause the installation of the entire large-span lattice shell structure to fail.

[0005] Based on this, there is an urgent need for a solution that can effectively improve the construction safety and construction accuracy of large-span lattice shell structures. Summary of the invention

[0006] In view of the above problems, an object of the present invention is to provide a large-span lattice shell structure construction method to solve the problems of low precision and safety risks in the existing unloading methods of large-span lattice shell structures.

[0007] The invention provides a large-span lattice shell structure construction method, the construction method comprising:

[0008] The prefabricated middle section grid shell and the first side span grid shell and the second side span grid shell on both sides of the middle section grid shell are hoisted to corresponding preset positions respectively;

[0009] The two sides of the middle section lattice shell are respectively butted and connected with the first side span lattice shell and the second side span lattice shell;

[0010] Performing preliminary synchronous unloading on the middle section lattice shell, the first side span lattice shell and the second side span lattice shell;

[0011] The middle section lattice shell, the first side span lattice shell and the second side span lattice shell are accurately unloaded in stages and inspected to complete the construction of the large-span lattice shell structure.

[0012] In addition, a preferred solution is that in the process of hoisting the prefabricated middle section grid shell and the first side span grid shell and the second side span grid shell on both sides of the middle section grid shell to the corresponding preset positions respectively,

[0013] The middle section lattice shell, the first side span lattice shell and the second side span lattice shell are all hoisted by at least two cranes; and,

[0014] The models and magnifications of the cranes hoisting the middle section lattice shell are the same, the models and magnifications of the cranes hoisting the first side span lattice shell are the same, and the models and magnifications of the cranes hoisting the second side span lattice shell are the same.

[0015] In addition, a preferred solution is that the synchronous preliminary unloading of the middle section lattice shell, the first side span lattice shell and the second side span lattice shell includes:

[0016] Perform the first synchronous unloading of each crane;

[0017] Monitoring the change in the hoisting weight of each crane during the first synchronous unloading process;

[0018] By adjusting the hook positions of the corresponding cranes, the lifting weight change values ​​of the cranes lifting the middle section grid shell during the first synchronous unloading process are made to converge, and the lifting weight change values ​​of the cranes lifting the first side span grid shell during the first synchronous unloading process are made to converge, and the lifting weight change values ​​of the cranes lifting the second side span grid shell during the first synchronous unloading process are made to converge.

[0019] In addition, a preferred solution is that the synchronous preliminary unloading of the middle section lattice shell, the first side span lattice shell and the second side span lattice shell further includes:

[0020] Monitoring the deflection change value of the first side span lattice shell during the first synchronous unloading process and the deflection change value of the second side span lattice shell during the first synchronous unloading process;

[0021] By adjusting the hook positions of the corresponding cranes, the deflection change value of the first side span lattice shell during the first synchronous unloading process is made to be similar to the deflection change value of the second side span lattice shell during the first synchronous unloading process.

[0022] In addition, a preferred solution is that the staged precise unloading of the middle section lattice shell, the first side span lattice shell and the second side span lattice shell comprises:

[0023] Prioritize unloading of the middle section lattice shell;

[0024] Coordinated unloading of the first side span lattice shell and the second side span lattice shell;

[0025] The two steps of preferentially unloading the middle section lattice shell and collaboratively unloading the first side span lattice shell and the second side span lattice shell are repeated until the unloading of the middle section lattice shell, the first side span lattice shell and the second side span lattice shell is completed.

[0026] In addition, a preferred solution is that the step of preferentially unloading the middle section lattice shell includes:

[0027] The cranes hoisting the intermediate section of the lattice shell are subjected to a second synchronous unloading, and the remaining cranes are not operated;

[0028] Monitor the change value of the hoisting weight of each crane during the second synchronous unloading process; and adjust the hook position of the corresponding crane so that the change value of the hoisting weight of each crane hoisting the middle section grid shell during the second synchronous unloading process converges, and the change value of the hoisting weight of each crane hoisting the first side span grid shell during the second synchronous unloading process converges, and the change value of the hoisting weight of each crane hoisting the second side span grid shell during the second synchronous unloading process converges;

[0029] Monitor the deflection change value of the first side span grid shell during the second synchronous unloading process and the deflection change value of the second side span grid shell during the second synchronous unloading process; and adjust the hook position of the corresponding crane to make the deflection change value of the first side span grid shell during the second synchronous unloading process converge with the deflection change value of the second side span grid shell during the second synchronous unloading process.

[0030] In addition, a preferred solution is that the coordinated unloading of the first side span lattice shell and the second side span lattice shell includes:

[0031] Perform the third synchronous unloading on each crane hoisting the first side span lattice shell and each crane hoisting the second side span lattice shell, and the remaining cranes do not move;

[0032] Monitor the change value of the hoisting weight of each crane during the third synchronous unloading process; and adjust the hook position of the corresponding crane so that the change value of the hoisting weight of each crane hoisting the middle section grid shell during the third synchronous unloading process converges, and the change value of the hoisting weight of each crane hoisting the first side span grid shell during the third synchronous unloading process converges, and the change value of the hoisting weight of each crane hoisting the second side span grid shell during the third synchronous unloading process converges;

[0033] Monitor the deflection change value of the first side span grid shell during the third synchronous unloading process and the deflection change value of the second side span grid shell during the third synchronous unloading process; and adjust the hook position of the corresponding crane to make the deflection change value of the first side span grid shell during the third synchronous unloading process and the deflection change value of the second side span grid shell during the third synchronous unloading process converge.

[0034] In addition, a preferred solution is that the deflection change value of the first side span lattice shell is the deflection change value of the first side span lattice shell close to one end of the middle section lattice shell;

[0035] The deflection change value of the second side span lattice shell is the deflection change value of the second side span lattice shell close to one end of the middle section lattice shell.

[0036] In addition, a preferred solution is that the prefabricated middle section grid shell and the first side span grid shell and the second side span grid shell on both sides of the middle section grid shell are hoisted to corresponding preset positions respectively, including:

[0037] Determine the hoisting position, main arm elevation angle and hoisting point position of each crane of the middle section lattice shell according to the weight, size and hoisting requirements of the middle section lattice shell;

[0038] Determine the hoisting position, main arm elevation angle and hoisting point position of each crane of the first side span lattice shell according to the weight, size and hoisting requirements of the first side span lattice shell;

[0039] The hoisting position, main arm elevation angle and hoisting point position of each crane of the second side span lattice shell are determined according to the weight, size and hoisting requirements of the second side span lattice shell.

[0040] In addition, a preferred solution is to connect the two sides of the middle section lattice shell to the first side span lattice shell and the second side span lattice shell respectively by butting and patching rods.

[0041] Compared with the prior art, the large-span lattice shell structure construction method according to the present invention has the following advantages:

[0042] Beneficial effects:

[0043] The large-span lattice shell structure construction method provided by the present invention can effectively control the structural deformation of the large-span lattice shell structure during the unloading process and reduce safety risks by real-time monitoring and adjusting the unloading amount of each crane and the deflection change value of each section of the lattice shell; in addition, accurate unloading can be achieved through the collaborative operation of multiple machines to ensure the stability and synchronization of the unloading process; in addition, the unloading process of the large-span lattice shell structure can be simplified, manual intervention can be reduced, and construction efficiency can be improved.

[0044] In order to achieve the above and related purposes, one or more aspects of the present invention include features that will be described in detail later and are particularly pointed out in the claims. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all of these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0046] Figure 1 A top view of a large-span lattice shell structure provided by an embodiment of the present invention during construction;

[0047] Figure 2 A front view of a large-span lattice shell structure provided by an embodiment of the present invention during construction;

[0048] Figure 3 A partial enlarged view of the main view of the large-span lattice shell structure provided by an embodiment of the present invention during construction;

[0049] Figure 4 A construction flow chart of the large-span lattice shell structure provided by the present invention;

[0050] Reference numerals: first side span lattice shell W1, middle section lattice shell W2, second side span lattice shell W3, upper chord 11, lower chord 12, web member 13, upper chord ball 14, lower chord ball 15, support 16, embedded upper chord 171, embedded lower chord 172, embedded web member 173, concrete column 2, steel wire rope 3, ground 4;

[0051] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0052] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0053] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Figure 1 The top view of the long-span lattice shell structure provided by the embodiment of the present invention during construction is shown. Figure 2 The main structure of the large-span lattice shell structure provided by the embodiment of the present invention during construction is shown. Figure 3 The main view of the partially enlarged structure of the connection position between shell segments of the long-span lattice shell structure provided by an embodiment of the present invention during construction is shown.

[0055] It should be noted that before introducing the specific steps of the large-span lattice shell structure construction method provided by the present invention in detail, it is necessary to first briefly introduce the large-span lattice shell structure; Figure 1 and 2 It can be seen that the large-span grid shell structure provided by the present invention can be divided into three sections during construction, namely, a middle section grid shell in the middle position and a first side span grid shell and a second side span grid shell on both sides of the middle section grid shell, wherein the ends of the first side span grid shell and the second side span grid shell that are away from each other need to be connected to the fixed support 16 on the concrete column 2 embedded in the ground 4 first, and the ends of the first side span grid shell and the second side span grid shell that are close to each other are respectively connected to the two ends of the middle section grid shell.

[0056] Further, by Figure 3 It can be seen that each section of the large-span lattice shell structure includes a plurality of upper chord balls 14 (bolt balls) and a plurality of lower chord balls 15 (bolt balls), an upper chord rod 11 is connected between adjacent upper chord balls 14, a lower chord rod 12 is connected between adjacent lower chord balls 15, a web rod 13 is connected between adjacent upper chord balls 14 and lower chord balls 15, and the upper chord balls 14, the lower chord balls 15, the upper chord rod 11, the lower chord rod 12 and the web rod 13 together constitute each section of the large-span lattice shell structure.

[0057] The construction method of the large-span lattice shell structure provided by the present invention is described in detail below. Figure 4 The construction process of the large-span lattice shell structure provided by the present invention is shown. Figures 1 to 4 It can be seen that the large-span lattice shell structure construction method provided by the present invention mainly includes the following construction methods:

[0058] S110: hoisting the prefabricated middle section grid shell W2 and the first side span grid shell W1 and the second side span grid shell W3 on both sides of the middle section grid shell W2 to corresponding preset positions respectively;

[0059] S120: docking and connecting the two sides of the middle section lattice shell W2 with the first side span lattice shell W1 and the second side span lattice shell W3 respectively;

[0060] S130: performing synchronous preliminary unloading of the middle section lattice shell W2, the first side span lattice shell W1 and the second side span lattice shell W3;

[0061] S140: The middle section lattice shell W2, the first side span lattice shell W1 and the second side span lattice shell W3 are accurately unloaded in stages and inspected to complete the construction of the large-span lattice shell structure.

[0062] Specifically, in the process of hoisting the prefabricated middle section grid shell W2 and the first side span grid shell W1 and the second side span grid shell W3 on both sides of the middle section grid shell W2 to the corresponding preset positions, the middle section grid shell W2, the first side span grid shell W1 and the second side span grid shell W3 are hoisted by multiple (at least two) cranes, and the cranes use hooks and wire ropes 3 to realize the hoisting of each section of the grid shell; and, in order to ensure accurate control of the unloading amount of each crane, the model and magnification of each crane hoisting the middle section grid shell W2 need to be set to the same, the model and magnification of each crane hoisting the first side span grid shell W1 need to be set to the same, and the model and magnification of each crane hoisting the second side span grid shell W3 need to be set to the same.

[0063] Furthermore, the middle section grid shell W2, the first side span grid shell W1 and the second side span grid shell W3 are synchronously preliminarily unloaded, including:

[0064] Perform the first synchronous unloading of each crane;

[0065] Monitor the change in hoisting weight of each crane during the first synchronous unloading process;

[0066] By adjusting the hook positions of the corresponding cranes, the lifting weight change values ​​of the cranes lifting the middle section lattice shell W2 during the first synchronous unloading process are made to converge, and the lifting weight change values ​​of the cranes lifting the first side span lattice shell W1 during the first synchronous unloading process are made to converge, and the lifting weight change values ​​of the cranes lifting the second side span lattice shell W3 during the first synchronous unloading process are made to converge;

[0067] Monitor the deflection change value of the first side span lattice shell W1 during the first synchronous unloading process and the deflection change value of the second side span lattice shell W3 during the first synchronous unloading process;

[0068] By adjusting the hook positions of the corresponding cranes, the deflection change value of the first side span lattice shell W1 during the first synchronous unloading process is made to be similar to the deflection change value of the second side span lattice shell W3 during the first synchronous unloading process.

[0069] It should be noted that, during the first synchronous unloading process of each crane, by ensuring that the change values ​​of the hoisting weight of each crane in the same grid shell segment are almost the same, and ensuring that the deflection change values ​​of the first side span grid shell W1 and the second side span grid shell W3 are almost the same, the structural deformation of each grid segment in the entire synchronous initial unloading process can be effectively controlled to reduce safety risks.

[0070] More specifically, the precise unloading of the middle section lattice shell W2, the first side span lattice shell W1 and the second side span lattice shell W3 in stages includes:

[0071] Prioritize unloading of the middle section lattice shell W2;

[0072] Coordinated unloading of the first side span lattice shell W1 and the second side span lattice shell W3;

[0073] The two steps of preferentially unloading the middle section lattice shell W2 and collaboratively unloading the first side span lattice shell W1 and the second side span lattice shell W3 are repeated until the unloading of the middle section lattice shell W2, the first side span lattice shell W1 and the second side span lattice shell W3 is completed.

[0074] Among them, the middle section lattice shell W2 is unloaded first, including:

[0075] The cranes hoisting the middle section of the lattice shell W2 are unloaded synchronously for the second time, and the other cranes are not moved;

[0076] Monitor the change value of the hoisting weight of each crane during the second synchronous unloading process; and adjust the hook position of the corresponding crane to make the change value of the hoisting weight of each crane hoisting the middle section grid shell W2 during the second synchronous unloading process converge, and make the change value of the hoisting weight of each crane hoisting the first side span grid shell W1 during the second synchronous unloading process converge, and make the change value of the hoisting weight of each crane hoisting the second side span grid shell W3 during the second synchronous unloading process converge;

[0077] Monitor the deflection change value of the first side span lattice shell W1 during the second synchronous unloading process and the deflection change value of the second side span lattice shell W3 during the second synchronous unloading process; and adjust the hook position of the corresponding crane to make the deflection change value of the first side span lattice shell W1 during the second synchronous unloading process converge with the deflection change value of the second side span lattice shell W3 during the second synchronous unloading process.

[0078] In addition, the first side span lattice shell W1 and the second side span lattice shell W3 are collaboratively unloaded, including:

[0079] The cranes hoisting the first side span lattice shell W1 and the cranes hoisting the second side span lattice shell W3 are unloaded synchronously for the third time, and the other cranes are not moved;

[0080] Monitor the change value of the hoisting weight of each crane during the third synchronous unloading process; and adjust the hook position of the corresponding crane to make the change value of the hoisting weight of each crane hoisting the middle section grid shell W2 during the third synchronous unloading process converge, and make the change value of the hoisting weight of each crane hoisting the first side span grid shell W1 during the third synchronous unloading process converge, and make the change value of the hoisting weight of each crane hoisting the second side span grid shell W3 during the third synchronous unloading process converge;

[0081] Monitor the deflection change value of the first side span lattice shell W1 during the third synchronous unloading process and the deflection change value of the second side span lattice shell W3 during the third synchronous unloading process; and adjust the hook position of the corresponding crane to make the deflection change value of the first side span lattice shell W1 during the third synchronous unloading process converge with the deflection change value of the second side span lattice shell W3 during the third synchronous unloading process.

[0082] It should be noted that, in order to ensure that the deflection change value of the lattice shell segment can accurately represent the degree of structural change of the lattice shell segment, the deflection change value of the first side span lattice shell W1 is taken from the deflection change value of the first side span lattice shell W1 at one end close to the middle section lattice shell W2, and the deflection change value of the second side span lattice shell W3 is taken from the deflection change value of the second side span lattice shell W3 at one end close to the middle section lattice shell W2.

[0083] In addition, in order to realize the initialization of the crane of each lattice shell segment, the prefabricated middle section lattice shell W2 and the first side span lattice shell W1 and the second side span lattice shell W3 on both sides of the middle section lattice shell W2 are hoisted to the corresponding preset positions respectively, further comprising:

[0084] According to the weight, size and hoisting requirements of the middle section lattice shell W2, determine the hoisting position, main arm elevation angle and hoisting point position of each crane of the middle section lattice shell W2;

[0085] Determine the hoisting position, main arm elevation angle and hoisting point position of each crane of the first side span lattice shell W1 according to the weight, size and hoisting requirements of the first side span lattice shell W1;

[0086] The hoisting positions, main arm elevation angles and hoisting point positions of each crane of the second side span lattice shell W3 are determined according to the weight, size and hoisting requirements of the second side span lattice shell W3.

[0087] In addition, in order to realize the connection between the two sides of the middle section lattice shell W2 and the first side span lattice shell W1 and the second side span lattice shell W3 respectively, the two sides of the middle section lattice shell W2 can be connected with the first side span lattice shell W1 and the second side span lattice shell W3 respectively through prefabricated docking and patching rods.

[0088] In order to more clearly understand the entire construction process of the large-span lattice shell structure construction method provided by the present invention, the steps of the large-span lattice shell structure construction method provided by the present invention are further explained below by taking six cranes as an example.

[0089] like Figures 1 to 3 As shown, the six cranes are the first crane, the second crane, the third crane, the fourth crane, the fifth crane and the sixth crane; they are respectively denoted as D1, D2, D3, D4, D5 and D6, wherein D1 and D2 are arranged on both sides of the first side span grid shell W1 for hoisting the first side span grid shell W1; D3 and D4 are arranged on the same side of the middle section grid shell W2 for hoisting the middle section grid shell W2, and D5 and D6 are arranged on both sides of the second side span grid shell W3 for hoisting the second side span grid shell W3; the two cranes of each section grid shell are required to have the same model and ratio, and can ensure that the requirements of hoisting and unloading are met.

[0090] In addition, it should be noted that when each crane is hoisting, its cab energy instrument can directly display the lifting load (respectively recorded as F1, F2, F3, F4, F5, F6), and the weight of each section of the lattice shell structure (respectively recorded as G1, G2, G3) is calculated by the sum of the hoisting weights of the corresponding cranes, that is, during the hoisting process, since the first side span lattice shell W1 and the second side span lattice shell W3 are both lifted by the crane, and neither of them interacts with the support, nor with the middle section lattice shell W2 takes effect, therefore, at this time, G1=F1+F2, G2=F3+F4, G3=F5+F6 exist, thereby realizing the calculation of the weight of each section of the lattice shell; thereafter, a detailed lifting plan can be formulated according to the weight, size and lifting requirements of each section of the lattice shell structure (W1, W2, W3); that is, determine the lifting position and main arm elevation angle of each crane and the center of the hook directly above the lifting point position to ensure that the lattice shell structure can be lifted smoothly and safely during the lifting process.

[0091] In addition, it should be noted that deformation monitoring points are arranged at key positions of each section of the grid shell structure (in the actual construction process, the deformation monitoring point of the first side span grid shell W1 is taken at its end close to the middle section grid shell W2, the deformation monitoring point of the second side span grid shell W3 is taken at its end close to the middle section grid shell W2, and the deformation monitoring point of the middle section grid shell W2 is in the middle position) for real-time monitoring of the spatial position changes of each section of the grid shell structure during the unloading process; wherein, the necessary measuring tools and instruments that need to be prepared include: such as hanging disc ruler, displacement sensor, total station reflection sheet, strain gauge, etc.; through these tools and instruments, the spatial position changes of each deformation monitoring point are realized, which can be represented by the deflection change value of each deformation monitoring point, and the deflection value of each section of the grid shell is represented by f1, f2, and f3, respectively.

[0092] After each section of the gridshell structure is hoisted to the preset position by the corresponding crane, the connection between each section of the gridshell structure can be realized in the air, that is, the first side span gridshell W1 and the second side span gridshell W3 are respectively connected to the two sides of the middle section gridshell W2. Specifically, the first side span gridshell is lifted by two cranes D1 and D2, and the second side span gridshell W3 is lifted by two cranes D5 and D6; the middle section gridshell W2 is lifted to the sky by two cranes D3 and D4, and then the middle section gridshell W2 is connected to the first side span gridshell W1 and the second side span gridshell W3 on both sides in the air.

[0093] It should be noted that, in the process of connecting the first side span lattice shell W1 and the second side span lattice shell W3, it is necessary to use a butt-jointed patching member, which includes a patching upper chord member 171, a patching lower chord member 172, and a patching web member 173; wherein the patching upper chord member 171 is used to connect the upper chord ball of the first side span lattice shell W1 or the second side span lattice shell W3 with the upper chord ball of the middle section lattice shell W2, the patching lower chord member 172 is used to connect the lower chord ball of the first side span lattice shell W1 or the second side span lattice shell W3 with the lower chord ball of the middle section lattice shell W2, and the patching web member 173 is used to connect the lower chord ball of the first side span lattice shell W1 or the second side span lattice shell W3 with the lower chord ball of the middle section lattice shell W2. 3 is used to connect the upper chord ball of the first side span lattice shell W1 or the second side span lattice shell W3 with the lower chord ball of the middle section lattice shell W2, or the embedded web bar 173 is used to connect the lower chord ball of the first side span lattice shell W1 or the second side span lattice shell W3 with the upper chord ball of the middle section lattice shell W2; in this way, a complete structural force system can be formed to achieve the stable connection between the first side span lattice shell W1 and the second side span lattice shell W3 and the middle section lattice shell W2 respectively. After the connection of each section of the lattice shell structure is completed, a comprehensive inspection is carried out to ensure that all connection points are firm and reliable without looseness.

[0094] After the connection between the sections of the grid shell structure is achieved in the air, preliminary unloading can be performed; specifically, the synchronous preliminary unloading of the middle section grid shell W2, the first side span grid shell W1 and the second side span grid shell W3 includes:

[0095] Perform the first synchronous unloading of the first crane, the second crane, the third crane, the fourth crane, the fifth crane and the sixth crane (the unloading weight is preset to be 0.5 to 1.0 ton, and there will be deviations in the actual operation process);

[0096] Monitor the lifting weight change values ​​of the first crane, the second crane, the third crane, the fourth crane, the fifth crane and the sixth crane during the first synchronous unloading process, and record them as: ΔF1, ΔF2, ΔF3, ΔF4, ΔF5, ΔF6;

[0097] Correction is performed by adjusting the upper and lower positions of the hooks of the corresponding cranes so that |ΔF1-ΔF2|≤maximum difference of primary unloading amount, |ΔF3-ΔF4|≤maximum difference of primary unloading amount, |ΔF5-ΔF6|≤maximum difference of primary unloading amount (for example, 1.0 ton); that is: make the lifting weight change values ​​of each crane hoisting the middle section gridshell W2 in the first synchronous unloading process converge, and make the lifting weight change values ​​of each crane hoisting the first side span gridshell W1 in the first synchronous unloading process converge, and make the lifting weight change values ​​of each crane hoisting the second side span gridshell W3 in the first synchronous unloading process converge, and ensure that ΔF1 is close to ΔF2, ΔF3 is close to ΔF4, and ΔF5 is close to ΔF6 as much as possible;

[0098] Monitor the deflection changes of the first side span lattice shell W1, the second side span lattice shell W3 and the middle section lattice shell W2 during the first synchronous unloading process, which are recorded as Δf1, Δf2 and Δf3 respectively;

[0099] Correction is performed by adjusting the upper and lower positions of the corresponding crane hooks so that |Δf1-Δf3| ≤ the maximum difference in primary deflection (for example, 5 cm), that is, the deflection change value of the first side span lattice shell W1 during the first synchronous unloading process is made similar to the deflection change value of the second side span lattice shell W3 during the first synchronous unloading process, ensuring that Δf1 is as close to Δf3 as possible.

[0100] After the middle section grid shell W2, the first side span grid shell W1 and the second side span grid shell W3 are preliminarily unloaded synchronously, the middle section grid shell W2, the first side span grid shell W1 and the second side span grid shell W3 are accurately unloaded in stages. The accurate unloading in stages includes:

[0101] Prioritize unloading of the middle section lattice shell W2;

[0102] Coordinated unloading of the first side span lattice shell W1 and the second side span lattice shell W3;

[0103] The two steps of preferentially unloading the middle section lattice shell W2 and collaboratively unloading the first side span lattice shell W1 and the second side span lattice shell W3 are repeated until the unloading of the middle section lattice shell W2, the first side span lattice shell W1 and the second side span lattice shell W3 is completed.

[0104] Specifically, the middle section lattice shell W2 is preferentially unloaded, including:

[0105] First, the third crane and the fourth crane are unloaded synchronously for the second time (the unloading weight is scheduled to be 1 to 2 tons, and there will be deviations in the actual operation process);

[0106] Monitor the changes in the hoisting weight of the first crane, the second crane, the third crane, the fourth crane, the fifth crane and the sixth crane during the second synchronous unloading process, which are recorded as: ΔF1', ΔF2', ΔF3', ΔF4', ΔF5', ΔF6' respectively;

[0107] Correction is performed by adjusting the upper and lower positions of the hooks of the corresponding cranes so that |ΔF1'-ΔF2'|≤the maximum difference of the secondary unloading amount (for example, 1 ton), |ΔF3'-ΔF4'|≤the maximum difference of the secondary unloading amount, and |ΔF5'-ΔF6'|≤the maximum difference of the secondary unloading amount; that is, the lifting weight change values ​​of the cranes hoisting the middle section gridshell W2 during the second synchronous unloading process are made similar, and the lifting weight change values ​​of the cranes hoisting the first side span gridshell W1 during the second synchronous unloading process are made similar, and the lifting weight change values ​​of the cranes hoisting the second side span gridshell W3 during the second synchronous unloading process are made similar, and ΔF1' is as close to ΔF2' as possible, ΔF3' is as close to ΔF4' as possible, and ΔF5' is as close to ΔF6' as possible;

[0108] Monitor the deflection changes of the first side span lattice shell W1, the second side span lattice shell W3 and the middle section lattice shell W2 during the second synchronous unloading process, and record them as Δf1', Δf2' and Δf3' respectively; and adjust the corresponding crane hooks to make |Δf1'-Δf3'| ≤ the maximum difference of the secondary deflection (for example, 5 cm), that is, make the deflection change value of the first side span lattice shell W1 during the second synchronous unloading process converge with the deflection change value of the second side span lattice shell W3 during the second synchronous unloading process, and ensure that Δf1' is as close to Δf3' as possible.

[0109] The first side span lattice shell W1 and the second side span lattice shell W3 are collaboratively unloaded, including:

[0110] Perform the third synchronous unloading of the first crane, the second crane, the fifth crane and the sixth crane (the unloading weight is scheduled to be 1 to 2 tons, and there will be deviations in the actual operation process);

[0111] Monitor the changes in the hoisting weight of the first crane, the second crane, the third crane, the fourth crane, the fifth crane and the sixth crane during the third synchronous unloading process, which are recorded as: ΔF1”, ΔF”, ΔF3”, ΔF4”, ΔF5”, ΔF6” respectively;

[0112] Correction is performed by adjusting the upper and lower positions of the hooks of the corresponding cranes to make |ΔF1”-ΔF2”|≤the maximum difference of the three-stage unloading amount (for example, 1 ton), |ΔF3”-ΔF4”|≤the maximum difference of the secondary unloading amount, and |ΔF5”-ΔF6”|≤the maximum difference of the three-stage unloading amount; that is, the lifting weight change values ​​of the cranes hoisting the middle section gridshell W2 in the third synchronous unloading process are made similar, and the lifting weight change values ​​of the cranes hoisting the first side span gridshell W1 in the third synchronous unloading process are made similar, and the lifting weight change values ​​of the cranes hoisting the second side span gridshell W3 in the third synchronous unloading process are made similar, and ΔF1” is as close to ΔF2” as possible, ΔF3” is close to ΔF4”, and ΔF5” is close to ΔF6”;

[0113] Monitor the deflection changes of the first side span lattice shell W1, the second side span lattice shell W3 and the middle section lattice shell W2 during the third synchronous unloading process, which are recorded as Δf1”, Δf2” and Δf3” respectively; and correct the deviation by adjusting the upper and lower positions of the corresponding crane hooks to make |Δf1”-Δf3”| ≤ the maximum difference of the three-level deflections (for example, 5 cm), that is, make the deflection change value of the first side span lattice shell W1 during the third synchronous unloading process converge with the deflection change value of the second side span lattice shell W3 during the third synchronous unloading process, and ensure that Δf1” is as close to Δf3” as possible.

[0114] Repeat the above steps of preferentially unloading the middle section grid shell W2 and the steps of coordinated unloading of the first side span grid shell W1 and the second side span grid shell W3, and perform cyclic unloading and deviation correction until the unloading of the entire large-span grid shell structure is completed; after the unloading of the entire large-span grid shell structure is completed, conduct a comprehensive inspection of the grid shell structure to ensure that there are no abnormalities in its stability and integrity; finally, organize the monitoring data during the unloading process and analyze the results.

[0115] As above Figures 1 to 4 The large-span lattice shell structure construction method according to the present invention is described by way of example. However, those skilled in the art should understand that various improvements can be made to the large-span lattice shell structure construction method proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A method for constructing a large-span lattice shell structure, characterized in that: The construction method comprises: Hoisting the prefabricated middle section grid shell and the first side span grid shell and the second side span grid shell on both sides of the middle section grid shell to corresponding preset positions respectively; The two sides of the middle section lattice shell are respectively docked and connected with the first side span lattice shell and the second side span lattice shell; Performing synchronous preliminary unloading on the middle section lattice shell, the first side span lattice shell, and the second side span lattice shell; The middle section lattice shell, the first side span lattice shell and the second side span lattice shell are accurately unloaded in stages and inspected to complete the construction of the long-span lattice shell structure.

2. The long-span lattice shell structure construction method according to claim 1, characterized in that: During the process of hoisting the prefabricated middle section grid shell and the first side span grid shell and the second side span grid shell on both sides of the middle section grid shell to the corresponding preset positions, The middle section lattice shell, the first side span lattice shell and the second side span lattice shell are all hoisted by at least two cranes; and, The models and magnifications of the cranes used to hoist the middle section lattice shell are the same, the models and magnifications of the cranes used to hoist the first side span lattice shell are the same, and the models and magnifications of the cranes used to hoist the second side span lattice shell are the same.

3. The long-span lattice shell structure construction method according to claim 2, characterized in that: The synchronous preliminary unloading of the middle section lattice shell, the first side span lattice shell and the second side span lattice shell includes: Perform the first synchronous unloading of each crane; monitoring the change in hoisting weight of each crane during the first synchronous unloading process; By adjusting the hook positions of the corresponding cranes, the lifting weight change values ​​of the cranes lifting the middle section grid shell during the first synchronous unloading process are made to converge, and the lifting weight change values ​​of the cranes lifting the first side span grid shell during the first synchronous unloading process are made to converge, and at the same time, the lifting weight change values ​​of the cranes lifting the second side span grid shell during the first synchronous unloading process are made to converge.

4. The long-span lattice shell structure construction method according to claim 3, characterized in that: The synchronous preliminary unloading of the middle section lattice shell, the first side span lattice shell and the second side span lattice shell further includes: monitoring a deflection change value of the first side span lattice shell during the first synchronous unloading process and a deflection change value of the second side span lattice shell during the first synchronous unloading process; By adjusting the hook positions of the corresponding cranes, the deflection change value of the first side span lattice shell during the first synchronous unloading process is made to converge with the deflection change value of the second side span lattice shell during the first synchronous unloading process.

5. The long-span lattice shell structure construction method according to claim 4, characterized in that: The precise unloading of the middle section lattice shell, the first side span lattice shell and the second side span lattice shell in stages includes: Prioritizing unloading of the middle section lattice shell; Coordinated unloading of the first side span lattice shell and the second side span lattice shell; The two steps of preferentially unloading the middle section lattice shell and collaboratively unloading the first side span lattice shell and the second side span lattice shell are repeated until the unloading of the middle section lattice shell, the first side span lattice shell and the second side span lattice shell is completed.

6. The long-span lattice shell structure construction method according to claim 5, characterized in that: The prioritizing unloading of the middle section lattice shell includes: Perform a second synchronous unloading on each crane hoisting the middle section of the lattice shell, and the remaining cranes are not operated; Monitor the change in the hoisting weight of each crane during the second synchronous unloading process; and adjust the hook positions of the corresponding cranes so that the change in the hoisting weight of each crane hoisting the middle section lattice shell during the second synchronous unloading process converges, and the change in the hoisting weight of each crane hoisting the first side span lattice shell during the second synchronous unloading process converges, and at the same time, the change in the hoisting weight of each crane hoisting the second side span lattice shell during the second synchronous unloading process converges; Monitor the deflection change value of the first side span grid shell during the second synchronous unloading process and the deflection change value of the second side span grid shell during the second synchronous unloading process; and adjust the hook position of the corresponding crane to make the deflection change value of the first side span grid shell during the second synchronous unloading process and the deflection change value of the second side span grid shell during the second synchronous unloading process converge.

7. The long-span lattice shell structure construction method according to claim 6, characterized in that: The collaborative unloading of the first side span lattice shell and the second side span lattice shell includes: Perform a third synchronous unloading of the cranes hoisting the first side span lattice shell and the cranes hoisting the second side span lattice shell, while the remaining cranes remain inactive; Monitor the change in the hoisting weight of each crane during the third synchronous unloading process; and adjust the hook positions of the corresponding cranes so that the change in the hoisting weight of each crane hoisting the middle section lattice shell during the third synchronous unloading process converges, the change in the hoisting weight of each crane hoisting the first side span lattice shell during the third synchronous unloading process converges, and the change in the hoisting weight of each crane hoisting the second side span lattice shell during the third synchronous unloading process converges; Monitor the deflection change value of the first side span grid shell during the third synchronous unloading process and the deflection change value of the second side span grid shell during the third synchronous unloading process; and adjust the hook position of the corresponding crane to make the deflection change value of the first side span grid shell during the third synchronous unloading process and the deflection change value of the second side span grid shell during the third synchronous unloading process converge.

8. The long-span lattice shell structure construction method according to claim 7, characterized in that: The deflection change value of the first side span lattice shell is the deflection change value of the first side span lattice shell close to one end of the middle section lattice shell; The deflection change value of the second side span lattice shell is the deflection change value of the second side span lattice shell close to one end of the middle section lattice shell.

9. The long-span lattice shell structure construction method according to any one of claims 2 to 8, characterized in that: The method of hoisting the prefabricated middle section lattice shell and the first side span lattice shell and the second side span lattice shell on both sides of the middle section lattice shell to corresponding preset positions includes: Determine the hoisting position, main arm elevation angle and hoisting point position of each crane of the middle section lattice shell according to the weight, size and hoisting requirements of the middle section lattice shell; Determine the hoisting position, main arm elevation angle, and hoisting point position of each crane of the first side span lattice shell according to the weight, size, and hoisting requirements of the first side span lattice shell; The hoisting position, main arm elevation angle and hoisting point position of each crane of the second side span lattice shell are determined according to the weight, size and hoisting requirements of the second side span lattice shell.

10. The long-span lattice shell structure construction method according to claim 9, characterized in that: The two sides of the middle section lattice shell are respectively connected to the first side span lattice shell and the second side span lattice shell by butting and patching rods.

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