Construction method suitable for string latticed shell double-layer composite structure with elastic hanger

Abstract

The invention discloses a construction method suitable for a string latticed shell double-layer composite structure with an elastic hanger, construction is performed layer by layer from bottom to top, and the ubiquitous precision and quality problems existing in the construction process of the string latticed shell double-layer composite structure with the elastic hanger are solved. According to the construction method, the absolute value of an installation error is reduced in a pre-deviation mode, the influence of construction deformation is counteracted, fine control over errors and deformation in the construction process is achieved, and the precision of structural construction forming is remarkably improved; structural tensioning process control is adopted, pre-deflection is not needed in the tensioning process of the supporting rod, construction is convenient and fast, the deflection phenomenon of the supporting rod can be avoided, and the tensioning forming effect is good; the spring system is installed along with the supporting rod but lagged in connection, secondary hoisting is avoided, the high-altitude operation amount is reduced, the operation difficulty is lowered, and construction is convenient and fast; the construction sequence is reasonable, the stress state and the design state of the formed structure are good in consistency, additional internal force is avoided, and the construction quality is easy to guarantee.

Description

Technical Field

[0001] The invention relates to the field of building steel structure construction, and in particular to a construction method of a double-layer composite structure of a tensioned lattice shell with elastic suspension. Background Art

[0002] The tensioned lattice shell structure has a self-balancing force mechanism and excellent spanning performance. In recent years, it has been widely used in the field of large-span spatial structures. With the further increase in demands for building functions and aesthetic effects, a system has emerged that uses a spring system to suspend a large-span sandwich structure under the tensioned lattice shell structure. The lower structure utilizes the suspension effect of the upper tensioned lattice shell to avoid setting up a supporting system, providing a large space for the building while significantly reducing the amount of steel used.

[0003] The upper and lower double-layer structures of this type of system are subjected to coordinated forces and affect each other, but the string-type lattice shell, spring system and lower-layer hanging structure are all sensitive to deformation and force. Under the design state, the projections of the string-type lattice shell nodes, struts, spring system and lower-layer structure nodes should overlap, and the struts and spring system should only bear the axial force. However, during the construction process, the relatively independent installation of the double-layer structure before the spring system is connected will produce relative errors. The shape change during the tensioning forming process of the string-type lattice shell is generally large, which will lead to problems such as strut shape deviation, seriously affecting the installation accuracy, and then causing the strut and spring system to be installed non-vertically. This situation will not only affect the appearance of the building, but also change the stress state of the structure, which will lead to construction defects of the structure and cause safety risks. Therefore, for this type of structural system, it is of great engineering significance to design a construction method that can effectively reduce construction errors, improve the installation accuracy of struts and spring systems, and facilitate construction, reduce construction defects, and make the structural forming state conform to the design concept. It is a problem that technicians in the relevant technical field need to solve urgently. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method suitable for such a structural system, so as to solve the common problems of accuracy and quality in the construction process of a double-layer composite structure of a tensioned lattice shell with elastic suspension. The method can realize the refined control of errors in the construction process, effectively improve the accuracy of structural installation, have strong feasibility, and the construction process does not change the designed stress state of the structure, reduce construction defects, and ensure the molding effect of the structure.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A construction method for a double-layer composite structure of a tensioned lattice shell with elastic suspension, which is constructed layer by layer from bottom to top, and the specific steps are as follows:

[0006] (1) Set up the temporary support system required for the installation of the lower structure;

[0007] (2) Calculate the construction deformation of the lower structure and determine the pre-deflection value ΔX through simulation analysis of the entire construction process 下 , ΔY 下 , ΔZ 下 , according to the pre-bias value and the design coordinates (X, Y, Z) of the lower structure 下 ) calculate the assembly coordinates (X+ΔX 下 , Y+ΔY 下 , Z 下 +ΔZ 下 ), and then the lower structure is assembled through hoisting and other construction processes, and the assembly error of the lower structure is measured to be ΔX' 下 , ΔY' 下 , ΔZ' 下 ;

[0008] (3) Set up the temporary support system required for the installation of the upper string-type lattice shell structure;

[0009] (4) Calculate the construction deformation of the upper lattice shell through simulation analysis of the entire construction process and determine the pre-bias value ΔX 上 , ΔY 上 , ΔZ 上 , according to the pre-bias value and the design coordinates (X, Y, Z) of the string-type lattice shell 上 ) calculate the assembly coordinates (X+ΔX 上 , Y+ΔY 上 , Z 上 +ΔZ 上 ), and then the assembly of the string-type lattice shell (excluding the cable system and the struts) is completed through hoisting and other construction processes. The assembly error of the string-type lattice shell is measured to be ΔX' 上 , ΔY' 上 , ΔZ' 上 ;

[0010] (5) Taking the center point A of the lower structure hanging node as the reference point and projecting upward vertically, the projection point B falls within the range of the upper string lattice shell node. The theoretical pre-bias values ​​of point B in the horizontal direction are calculated to be After pre-deflection according to this value, point C is obtained. The strut is installed with point C as the control point, and then the cable system is installed;

[0011] (6) The upper layer of the string-type lattice shell is tensioned by using a symmetrical graded tensioning process at both ends of the cable. During the process, the shape change ΔX of the string-type lattice shell is monitored and recorded. 上1 , ΔY 上1 , ΔZ 上1 ;

[0012] (7) Unload the temporary support system of the upper string-lattice shell structure, and monitor and record the shape change ΔX of the string-lattice shell during the process. 上2 , ΔY 上2 , ΔZ上2 ;

[0013] (8) Install the spring system. The double-layer structure is connected through the spring system. During this process, the structure does not undergo obvious shape changes.

[0014] (9) Unload the temporary support system of the lower structure. During the process, the configuration changes of the double-layer structure are monitored and recorded as ΔX 上3 , ΔY 上3 , ΔZ 上3 and ΔX 下1 , ΔY 下1 , ΔZ 下1 ;

[0015] (10) The construction is completed by installing auxiliary structures and applying service loads. During the process, the configuration changes of the double-layer structure are monitored and recorded as ΔX 上4 , ΔY 上4 , ΔZ 上4 and ΔX 下2 , ΔY 下2 , ΔZ 下2 .

[0016] Furthermore, the relationship between the pre-deflection value of the lower structure in the above construction method and the deformation during the construction process is: Without considering the assembly error, the forming coordinate values ​​of the lower structure are consistent with the design coordinates when the construction is completed.

[0017] Furthermore, the relationship between the pre-deflection value of the string-type lattice shell structure and the deformation during the construction process in the above construction method is: Without considering the assembly error, the forming coordinate values ​​of the tensioned lattice shell structure are consistent with the design coordinates when the construction is completed.

[0018] Furthermore, in the above construction method, the upper layer of the tensioned lattice shell and the lower layer of the structure are not limited to being assembled by hoisting technology, and different technologies such as lifting may also be applicable depending on the construction conditions.

[0019] Furthermore, in the above construction method, the support rod and the string lattice shell are connected by a pin shaft, and the pin shaft ear plate is not assembled at the same time as the string lattice shell, but is installed together with the support rod, and the ear plate determines the installation position through the control point C. When the construction is completed, the horizontal installation error between the support rod and the string lattice shell and the relative error between the support rod and the lower structure hanging node are The relative assembly error between the double-layer structures is neutralized by adjusting the installation position of the support rods, thereby reducing the absolute value of the error.

[0020] Furthermore, in the above construction method, the spring system is installed together with the support rod on the ground, and is put into place at high altitude with the support rod but is not connected to the hanging node of the lower structure, which can avoid the secondary lifting of the spring system and reduce the amount of high-altitude work.

[0021] Furthermore, in the above construction method, a symmetrical graded tensioning method is adopted at both ends of the cable when tensioning the string-type lattice shell structure. No pre-biasing is required during the tensioning process of the strut. During the graded tensioning process, the tensioning stroke at both ends of the cable is adjusted in real time according to the verticality observation results of the strut. If the strut deflects to one side, it means that the tensioning stroke in the deflection direction of the strut is too large and the tensioning should be temporarily suspended. The tensioning stroke on the other side is too small and the tensioning should be continued until the deflection of the strut is restored and both sides continue to be tensioned simultaneously.

[0022] Furthermore, in the above construction method, the upper-layer string-tensioned lattice shell structure should unload the temporary support system after tensioning is completed, then connect the spring system, and finally unload the temporary support system of the lower structure. Under this construction sequence, the spring system is prevented from being stressed in advance, and after the spring is connected, it only bears the vertical load transmitted from the lower structure, which is more in line with the designed stress state. It also avoids the tensioning construction deformation of the string-tensioned lattice shell when the spring is connected in advance, which causes the lower structure to generate additional internal forces during construction, affecting the structural safety.

[0023] In summary, the present invention has the following beneficial effects:

[0024] (1) This construction method reduces the absolute value of the installation error by pre-biasing, offsets the influence of construction deformation, realizes the refined control of error and deformation during the construction process, and significantly improves the accuracy of structural construction;

[0025] (2) This construction method adopts structural tensioning process control, and no pre-biasing is required during the tensioning process of the struts. The construction is convenient and the deflection of the struts can be avoided, and the tensioning forming effect is good;

[0026] (3) The spring system is installed together with the support rod but connected later, which avoids secondary lifting, reduces the amount of high-altitude work and reduces the difficulty of work, facilitating construction;

[0027] (4) The construction sequence is reasonable, the stress state of the structure after forming is consistent with the design state, avoiding the generation of additional internal forces, and the construction quality is easy to ensure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional schematic diagram of the structure of an embodiment of the present invention;

[0029] Figure 2 It is a schematic cross-sectional view of the structure of an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the structural construction process of an embodiment of the present invention;

[0031] Figure 4 A three-dimensional schematic diagram of the connection node between the lower lattice shell and the spring system in an embodiment of the present invention;

[0032] Figure 5 A three-dimensional schematic diagram of the upper layer of the lattice shell node in an embodiment of the present invention;

[0033] Figure 6 It is a bottom view of the node of the upper layer of the string-type lattice shell in the embodiment of the present invention;

[0034] Figure 7 It is a three-dimensional schematic diagram of the bottom node of the support rod and the connection node of the spring system in an embodiment of the present invention.

[0035] In the figure: 1. Tension-string lattice shell; 2. Structural column; 3. Strut; 4. Cable system; 5. Spring system; 6. Lower lattice shell; 7. Concrete beam; 8. Temporary support system for lower lattice shell; 9. Temporary support system for tension-string lattice shell; 10. Hanging node of lower lattice shell; 11. Tension-string lattice shell node; 12. Node at the bottom end of strut. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-7 The construction method of the present invention applicable to the double-layer composite structure of the tensioned lattice shell with elastic suspension is further described in detail.

[0037] like Figure 1 and Figure 2 As shown, the present invention is directed to a double-layer composite structure system of a string-type lattice shell with elastic suspension, which mainly comprises a string-type lattice shell 1, a structural column 2, a strut 3, a cable system 4, a spring system 5 and a lower-layer lattice shell 6; the string-type lattice shell 1 forms a self-balanced force system through the strut 3 and the cable system 4 and is supported by the structural column 2 to form a stable structure; the lower-layer lattice shell 6 is supported on a concrete beam 7 at its periphery and is suspended under the strut node of the string-type lattice shell 1 through the spring system 5, and cooperates with the upper-layer string-type lattice shell 1 to form a double-layer composite structure;

[0038] A construction method for a double-layer composite structure of a tensioned lattice shell with elastic suspension, comprising the following steps:

[0039] 1. If Figure 3 As shown, firstly, a temporary support system 8 required for the installation of the lower layer of grid shell 6 is set up;

[0040] 2. The total construction deformation of the lower lattice shell 6 is calculated by simulating and analyzing the entire construction process. The absolute value of the total construction deformation in each direction is the pre-bias value ΔX 下 , ΔY 下 , ΔZ 下 The pre-bias direction is opposite to the total deformation direction of the construction. According to the pre-bias value and the design coordinates (X, Y, Z) of the lower lattice shell 6 下 ) calculate the assembly coordinates (X+ΔX 下 , Y+ΔY 下 , Z 下 +ΔZ 下), the assembly of the lower lattice shell 6 is completed by the segmented lifting process according to the assembly coordinates, and the assembly error of the lower lattice shell 6 is measured to be ΔX' 下 , ΔY' 下 , ΔZ' 下 ;

[0041] 3. Erection of a temporary support system 9 required for installation of the upper string-type lattice shell 1;

[0042] 4. The total construction deformation of the upper string-type lattice shell 1 is calculated by simulating and analyzing the entire construction process. Similarly, the absolute value of the total construction deformation in each direction is the pre-bias value ΔX 上 , ΔY 上 , ΔZ 上 The pre-bias direction is opposite to the total deformation direction during construction. According to the pre-bias value and the design coordinates (X, Y, Z) of the tension-string lattice shell 1, 上 ) calculate the assembly coordinates (X+ΔX 上 , Y+ΔY 上 , Z 上 +ΔZ 上 ), the assembly of the string-type lattice shell 1 (excluding the cable system 4 and the strut 3) is completed by the segmented lifting process according to the assembly coordinates, and the assembly error of the string-type lattice shell 1 is measured to be ΔX' 上 , ΔY' 上 , ΔZ' 上 ;

[0043] 5. If Figures 4 to 6 , the center point A of the lower lattice shell hanging node 10 is used as the reference point to project vertically upward to obtain the projection point B which falls within the range of the upper string lattice shell node 11 (when there is assembly error and installation pre-bias, point B does not coincide with the center point O of the string lattice shell grounding 11). According to the difference between the relative assembly error and the installation pre-bias value of the string lattice shell 1 and the lower lattice shell 6, the installation control point of the strut 3 is also pre-biased in the horizontal direction. Taking point B as the reference, the horizontal pre-bias values ​​are respectively The pre-bias direction is from point B to the center point O of the tension string lattice node 11. After pre-biasing according to this value, point C is obtained, and the strut 3 is installed with point C as the control point.

[0044] like Figure 7 As shown, the bottom node 12 of the strut 3 is pre-connected with the spring system 5 on the ground, and the spring system 5 can be put in place together with the strut 3 when installing it, but the spring system 5 must not be connected to the lower layer lattice shell hanging node 10 at this time. Thereafter, the cable system 4 is installed and pre-tightened.

[0045] 6. Use the symmetrical graded tensioning process at both ends of the cable to tension the upper layer of the string-type lattice shell 1. During the graded tensioning process, adjust the tensioning stroke at both ends of the cable in real time according to the verticality observation results of the struts. If the struts deflect to one side, the tensioning stroke in the direction of the strut deflection is too large and the tensioning should be temporarily suspended. If the tensioning stroke on the other side is too small, the tensioning should be continued until the strut deflection is restored and both sides continue to tension at the same time. Monitor and record the shape change ΔX of the string-type lattice shell 1 during the process 上1 , ΔY 上1 , ΔZ 上1 ;

[0046] 7. Unload the temporary support system 9 of the upper string-type lattice shell 1, and monitor and record the position change ΔX of the string-type lattice shell 1 during the process. 上2 , ΔY 上2 , ΔZ 上2 ;

[0047] 8. Connect the spring system 5 to the hanging node 10 of the lower lattice shell 6. During this process, the structure does not undergo obvious configuration changes;

[0048] 9. Unload the temporary support system 8 of the lower lattice shell. At this time, the spring system 5 begins to bear force. During the process, the position changes of the string lattice shell 1 and the lower lattice shell 6 are monitored and recorded as ΔX 上3 , ΔY 上3 , ΔZ 上3 and ΔX 下1 , ΔY 下1 , ΔZ 下1 ;

[0049] 10. Install the roof panels and other auxiliary structures, and the construction is completed. During the process, the position changes of the string lattice shell 1 and the lower lattice shell 6 are monitored and recorded as ΔX 上4 , ΔY 上4 , ΔZ 上4 and ΔX 下2 , ΔY 下2 , ΔZ 下2 .

[0050] When the construction is completed, the total construction deformation of the string lattice shell 1 and the lower lattice shell 6 and the corresponding pre-bias value offset each other. Without considering the assembly error, the string lattice shell 1 and the lower lattice shell 6 just reach the design coordinate position. At this time, the projection positions of the connection nodes of the string lattice shell 1, the strut 3, the spring system 5 and the lower lattice shell 6 coincide, which meets the design position and force requirements. If the assembly error is considered, the deviation between the string lattice shell 1 and the lower lattice shell 6 and the design position is the assembly error. Without the influence of construction deformation, the horizontal installation error between the strut 3 and the string lattice shell 1 and the horizontal installation error between the strut 3 and the lower lattice shell 6 are both It is the average value of the relative assembly error between the tensioned lattice shell 1 and the lower lattice shell 6, which further reduces the extreme error value, improves the installation accuracy, and can also better ensure the structural forming effect and stress state.

[0051] The above description is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiment. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0052] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should also be regarded as within the scope of protection of the present invention.

Claims

1. A construction method for a double-layer composite structure of a tensioned lattice shell with elastic suspension, which is constructed layer by layer from bottom to top, characterized in that , the specific steps are as follows: (1) Set up the temporary support system required for the installation of the lower structure; (2) Calculate the construction deformation of the lower structure and determine the pre-deflection value ΔX through simulation analysis of the entire construction process 下 , ΔY 下 , ΔZ 下 , according to the pre-bias value and the design coordinates (X, Y, Z) of the lower structure 下 ) calculate the assembly coordinates (X+ΔX 下 , Y+ΔY 下 , Z 下 +ΔZ 下 ), and then the lower structure is assembled through hoisting and other construction processes, and the assembly error of the lower structure is measured to be ΔX' 下 , ΔY' 下 , ΔZ' 下 ; (3) Set up the temporary support system required for the installation of the upper string-type lattice shell structure; (4) Calculate the construction deformation of the upper lattice shell through simulation analysis of the entire construction process and determine the pre-bias value ΔX 上 , ΔY 上 , ΔZ 上 , according to the pre-bias value and the design coordinates (X, Y, Z) of the string-type lattice shell 上 ) calculate the assembly coordinates (X+ΔX 上 , Y+ΔY 上 , Z 上 +ΔZ 上 ), and then the assembly of the string-type lattice shell (excluding the cable system and the struts) is completed through hoisting and other construction processes. The assembly error of the string-type lattice shell is measured to be ΔX' 上 , ΔY' 上 , ΔZ' 上 ; (5) Taking the center point A of the lower structure hanging node as the reference point and projecting upward vertically, the projection point B falls within the range of the upper string lattice shell node. The theoretical pre-bias values ​​of point B in the horizontal direction are calculated to be After pre-deflection according to this value, point C is obtained. The strut is installed with point C as the control point, and then the cable system is installed; (6) The upper layer of the string-type lattice shell is tensioned by using a symmetrical graded tensioning process at both ends of the cable. During the process, the shape change ΔX of the string-type lattice shell is monitored and recorded. 上1 , ΔY 上1 , ΔZ 上1 ; (7) Unload the temporary support system of the upper string-lattice shell structure, and monitor and record the shape change ΔX of the string-lattice shell during the process. 上2 , ΔY 上2 , ΔZ 上2 ; (8) Install the spring system. The double-layer structure is connected through the spring system. During this process, the structure does not undergo obvious shape changes. (9) Unload the temporary support system of the lower structure. During the process, the configuration changes of the double-layer structure are monitored and recorded as ΔX 上3 , ΔY 上3 , ΔZ 上3 and ΔX 下1 , ΔY 下1 , ΔZ 下1 ; (10) The construction is completed by installing auxiliary structures and applying service loads. During the process, the configuration changes of the double-layer structure are monitored and recorded as ΔX 上4 , ΔY 上4 , ΔZ 上4 and ΔX 下2 , ΔY 下2 , ΔZ 下2 .

2. The construction method for a double-layer composite structure of a tensioned lattice shell with elastic suspension according to claim 1 is characterized in that: The relationship between the pre-deflection value of the lower structure in the above construction method and the deformation during the construction process is: Without considering the assembly error, the forming coordinate values ​​of the lower structure are consistent with the design coordinates when the construction is completed.

3. The construction method for a double-layer composite structure of a tensioned lattice shell with elastic suspension according to claim 1, characterized in that: The relationship between the pre-deflection value of the string-type lattice shell structure and the deformation during the construction process in the above construction method is: Without considering the assembly error, the forming coordinate values ​​of the tensioned lattice shell structure are consistent with the design coordinates when the construction is completed.

4. The construction method for a double-layer composite structure of a tensioned lattice shell with elastic suspension according to claim 1, characterized in that: In the above construction method, the upper layer of the tensioned lattice shell and the lower layer of the structure are not limited to being assembled by hoisting technology, and different technologies such as lifting may also be applicable depending on the specific construction conditions.

5. The construction method for a double-layer composite structure of a tensioned lattice shell with elastic suspension according to claim 1, characterized in that: In the above construction method, the support rod and the string lattice shell are connected by a pin shaft. The pin shaft ear plate is not assembled at the same time as the string lattice shell, but is installed together with the support rod. The ear plate determines the installation position through the control point C. When the construction is completed, the horizontal installation error between the support rod and the string lattice shell and the relative error between the support rod and the lower structure hanging node are The relative assembly error between the double-layer structures is neutralized by adjusting the installation position of the support rods, thereby reducing the absolute value of the error.

6. The construction method for a double-layer composite structure of a tensioned lattice shell with elastic suspension according to claim 1, characterized in that: In the above construction method, the spring system is installed together with the support rod on the ground, and is put into place at high altitude with the support rod but is not connected to the hanging node of the lower structure, which can avoid the secondary lifting of the spring system and reduce the amount of high-altitude work.

7. The construction method for a double-layer composite structure of a tensioned lattice shell with elastic suspension according to claim 1, characterized in that: In the above construction method, a symmetrical graded tensioning method is adopted at both ends of the cable when tensioning the string-type lattice shell structure. No pre-bias is required during the tensioning process of the strut. During the graded tensioning process, the tensioning stroke at both ends of the cable is adjusted in real time according to the verticality observation results of the strut. If the strut deflects to one side, it means that the tensioning stroke in the deflection direction of the strut is too large and the tensioning should be temporarily suspended. The tensioning stroke on the other side is too small and the tensioning should be continued until the deflection of the strut is restored and both sides continue to be tensioned simultaneously.

8. The method according to claim 1, characterized in that: In the above construction method, the upper-layer string-tensioned lattice shell structure should unload the temporary support system after tensioning is completed, then connect the spring system, and finally unload the temporary support system of the lower structure. Under this construction sequence, the spring system is prevented from being stressed in advance. After the spring is connected, it only bears the vertical load transmitted from the lower structure, which is more in line with the designed stress state. It also avoids the tensioning construction deformation of the string-tensioned lattice shell when the spring is connected in advance, which causes the lower structure to generate additional internal forces during construction, affecting the structural safety.

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