Reinforcing and lifting method for multi-truss structure

Abstract

The invention discloses a reinforcing and lifting method for a multi-truss truss structure, which comprises the following steps: designing an X-direction reinforcing truss for reinforcing and connecting single trusses in a Y-direction multi-truss truss according to a design drawing of the multi-truss truss structure, deepening the design drawing of the multi-truss structure according to the shape, the size and the mounting position of the X-direction reinforcing truss to form a design drawing of a combined truss structure spliced with the X-direction reinforcing truss; the X-direction reinforcing truss and the multi-truss truss structure are assembled together to form a combined truss structure according to the deepened design drawing; a lifting point is arranged on the combined truss structure; and the combined truss structure is lifted to the installation position of the multi-truss truss structure, and after welding is completed, the reinforcing truss is dismantled. According to the method, the single trusses are connected together in a reinforcing mode through the reinforcing trusses, the overall stability of the single trusses during lifting is improved, and therefore the overall lifting in-position of the multi-truss structure can be smoothly achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a reinforcement and lifting method for a multi-truss structure. Background Art

[0002] During steel structure construction, the use of large trusses as a whole is often required due to various stringent construction conditions. The hoisted trusses are connected to an external stabilizing frame, and for reasons of hoisting accuracy and safety during subsequent component installation, secondary beams perpendicular to the trusses are often hoisted simultaneously to save construction time.

[0003] During the overall truss lifting process, multiple trusses are connected and secured using transverse connecting steel beams between them, or by installing tie rods at the nodes of the multiple trusses, connected to the truss' stable positions. These two methods have proven to be safe and effective lifting and reinforcement methods in engineering practice. However, when there are trusses in all vertical directions, and the length of the pullout significantly affects the lifting and installation accuracy, synchronization control accuracy, and measurement errors, lifting multiple trusses into place is time-consuming and labor-intensive, increasing on-site construction time and costs, and positioning accuracy cannot be guaranteed. Summary of the Invention

[0004] In response to the above-mentioned problems, the present invention discloses a reinforcement and lifting method for a multi-truss structure to overcome the problem in the prior art that it is time-consuming and labor-intensive to lift multiple trusses into place when there are trusses in all vertical directions and the length of the lifting has a great influence on the lifting installation accuracy, synchronization control accuracy and measurement error.

[0005] A reinforcement and lifting method for a multi-span truss structure is applied to the reinforcement and lifting of a multi-span truss structure without an X-direction connecting beam. The multi-span truss structure includes a first X-direction truss, a second X-direction truss, a Y-direction multi-span truss, and a Y-direction connecting beam. Each single truss of the Y-direction multi-span truss includes a first end and a second end disposed opposite the first end. The first end of each single truss of the Y-direction multi-span truss is fixed to the first X-direction truss. The first X-direction truss and the second X-direction truss are fixedly connected together via the Y-direction connecting beam. The method comprises the following steps:

[0006] Step S1: Designing an X-direction reinforcement truss for reinforcing and connecting each single truss in the Y-direction multi-truss according to the design drawings of the multi-truss structure, wherein the connection between the X-direction reinforcement truss and each single truss is arranged adjacent to the second end of the single truss; wherein the shape, size, and installation position of the X-direction reinforcement truss are determined according to the design drawings of the multi-truss structure, and the design drawings of the multi-truss structure are deepened according to the shape, size, and installation position of the reinforcement truss to form a design drawing of a combined truss structure spliced ​​with the X-direction reinforcement truss;

[0007] Step S2: assembling the X-direction reinforcement truss and the multiple truss structures together to form a combined truss structure according to the refined design drawing;

[0008] Step S3: Setting a hanging point at the free end of each truss in the combined truss structure;

[0009] Step S4: using the lifting points to lift the combined truss structure to the installation position of the multiple truss structures, and after the multiple truss structures are welded to the surrounding structures, the reinforcement trusses are removed.

[0010] In some embodiments, the distance between the connection point between the X-direction reinforcement truss and the single truss and the second end of the single truss is 1 to 2 meters.

[0011] In some embodiments, the Y-direction connecting beam is an I-beam.

[0012] In some embodiments, in step S2:

[0013] Assembling to form the first X-direction truss and the second X-direction truss;

[0014] After the lower chords of each single truss in the Y-direction multi-truss are connected to the lower chords of the first X-direction truss, the lower chords of the X-direction reinforcement trusses are detachably fixed to the lower chords of each single truss;

[0015] After the upper chords of each single truss in the Y-direction multi-truss are connected to the upper chord of the first X-direction truss, the upper chords of the X-direction reinforcement truss are detachably fixed to the upper chords of each single truss;

[0016] After the web members of each single truss in the Y-direction multi-truss are assembled in place, the connection of each Y-direction connecting beam with the upper chord of the first X-direction truss, the second X-direction truss and the X-direction reinforcement truss is completed;

[0017] The installation of the web members of the X-direction reinforcement truss is completed.

[0018] In some embodiments, the web members of the X-direction reinforcement trusses include diagonal web members and straight web members.

[0019] In some embodiments, in step S4, the specific steps of removing the reinforcement truss are:

[0020] Remove the upper chord, web and lower chord of the reinforcement truss in sequence.

[0021] In some embodiments, the lower chord of the X-direction reinforcement truss is fixed to the lower chord of each single truss by bolts;

[0022] Fixing the upper chord of the X-direction reinforcement truss to the upper chord of each single truss by bolts;

[0023] The web members of the X-direction reinforcement trusses are installed by means of bolts.

[0024] In some embodiments, the Y-direction multi-truss is a three-truss.

[0025] Compared with the prior art, the above invention has at least one of the following advantages or beneficial effects:

[0026] The present invention discloses a reinforcement and lifting method for a multi-span truss structure. When the steel structure is lifted as a whole, the multi-span trusses are reinforced by constraining the degree of freedom of their ends. That is, during the ground assembly stage of the main structure trusses, the reinforcement trusses are used to detachably reinforce and connect the single trusses together. The reinforcement trusses are a rotatable reinforcement measure, which increases the overall stability when the single trusses are lifted, and can effectively reduce the multi-directional swing instability caused by the truss cantilever during the lifting process, thereby smoothly achieving the overall lifting and positioning of the multi-span truss structure, shortening the overall lifting and positioning time of the steel structure, and improving the overall construction efficiency. It can also be expanded for use to solve the problem that the secondary beams connecting multiple single trusses are weak and insufficient to meet the requirements of overall lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention and its features, configurations, and advantages will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings. Like reference numerals indicate like parts throughout the drawings. The drawings are not necessarily drawn to scale, emphasis being placed on illustrating the subject matter of the present invention.

[0028] Figure 1 A top view of the ground assembly of multiple truss structures and X-direction reinforcement trusses in an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Cross-section at AA in the middle;

[0030] Figure 3 A schematic diagram of the combined truss structure being lifted into place and the X-direction reinforcement trusses being removed in an embodiment of the present invention;

[0031] Among them, 1. X-direction reinforcement truss; 1-1. Lower chord of X-direction reinforcement truss; 1-2. Upper chord of X-direction reinforcement truss; 1-3. Diagonal web of X-direction reinforcement truss; 1-4. Straight web of X-direction reinforcement truss; 2. Single truss 1; 2-1. Lower chord of single truss 1; 2-2. Upper chord of single truss 1; 2-3. Web of single truss 1; 3. Single truss 2; 3-1. Lower chord of single truss 2; 3-2. Upper chord of single truss 2; 3-3. Web of single truss 2; 4. Single truss three; 4-1. Lower chord of single truss three; 4-2. Upper chord of single truss three; 4-3. Web member of single truss three; 5. Y-direction connecting beam; 6. First X-direction truss; 7. Second X-direction truss. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0033] like Figures 1 to 3 As shown, this embodiment discloses a reinforcement and lifting method for a multi-span truss structure, which is described below by taking a three-span truss structure as an example; the method is applied to the reinforcement and lifting of a three-span truss structure without an X-direction connecting beam, the three-span truss structure includes a first X-direction truss 6, a second X-direction truss 7, three Y-direction trusses (the three Y-direction trusses include a single truss 1 2, a single truss 2 3 and a single truss 3 4) and a Y-direction connecting beam 5, and each single truss of the three Y-direction trusses is The three Y-direction trusses include a first end and a second end opposite to the first end. The first end of each single truss of the three Y-direction trusses is fixed to the first X-direction truss 6. The first X-direction truss 6 and the second X-direction truss 7 are fixedly connected together by a Y-direction connecting beam 5. The second X-direction truss 7 may be provided with one or more (only one is shown in the figure). It should be noted that the X-direction and the Y-direction in this embodiment generally refer to two mutually perpendicular directions. Specifically, the method includes the following steps:

[0034] Step S1: According to the design drawings of the three-truss structure, an X-direction reinforcement truss 1 is designed for reinforcing and connecting each single truss in the Y-direction three trusses (respectively, single truss 1 2, single truss 2 3 and single truss 3 4), and the connection between the X-direction reinforcement truss 1 and each single truss is arranged adjacent to the second end of the single truss; wherein, the shape, size and installation position of the X-direction reinforcement truss 1 are determined according to the design drawings of the three-truss structure, and the design drawings of the three-truss structure are deepened according to the shape, size and installation position of the reinforcement truss to form a design drawing of a combined truss structure spliced ​​with the X-direction reinforcement truss 1.

[0035] Specifically, the distance between the connection between the X-direction reinforcement truss 1 and each single truss and the second end of each single truss is 1 to 2 meters, and the X-direction reinforcement truss 1 and each single truss are designed to be vertically connected.

[0036] Step S2: according to the refined design drawing, the X-direction reinforcement truss 1 and the three truss structures are assembled together to form a combined truss structure.

[0037] Specifically, such as Figure 1 and 2 In the structure shown, in step S2: first, the first X-direction truss 6 and the second X-direction truss 7 are assembled; then, after the lower chords of each single truss in the Y-direction multi-truss are connected to the lower chord of the first X-direction truss 6, the lower chord of the X-direction reinforcement truss 1 is fixed to the lower chord of each single truss by bolts (that is, after the lower chord 2-1 of the single truss 1, the lower chord 3-1 of the single truss 2, and the lower chord 4-1 of the single truss 3 are assembled in place, the lower chord 1-1 of the X-direction reinforcement truss is installed in place by bolts); then, after the upper chords of each single truss in the Y-direction multi-truss are connected to the upper chord of the first X-direction truss 6, the upper chord of the X-direction reinforcement truss 1 is fixed to the upper chord of each single truss by bolts (That is, after the upper chord 2-2 of single truss one, the upper chord 3-2 of single truss two and the upper chord 4-2 of single truss three are assembled in place, the upper chord 1-2 of the X-direction reinforcement truss is installed in place by bolts); then after the web members of each single truss in the three Y-direction trusses are assembled in place (that is, after the web members 2-3 of single truss one, the web members 3-3 of single truss two and the web members 4-3 of single truss three are assembled in place), the connection of each Y-direction connecting beam 5 with the first X-direction truss 6, the second X-direction truss 7 and the upper chord of the X-direction reinforcement truss 1 is completed; thereafter, the installation of the web members of the X-direction reinforcement truss 1 is completed by bolts, wherein the web members of the X-direction reinforcement truss 1 include the diagonal web members 1-3 of the X-direction reinforcement truss and the straight web members 1-4 of the X-direction reinforcement truss.

[0038] Step S3: Setting a lifting point at the free end of each truss in the combined truss structure. The free ends of each truss in the combined truss structure include the second end of single truss 1 2 , the second end of single truss 2 3 , the second end of single truss 3 4 , both ends of the first X-direction truss 6 , and both ends of the second X-direction truss 7 , thereby ensuring more stable subsequent lifting.

[0039] Step S4: Use the lifting points to lift the combined truss structure to the installation position of the three truss structures, and after the three truss structures are welded to the surrounding structures, remove the reinforcement trusses. Figure 3 The structure shown.

[0040] It should be noted that during the lifting process of the combined truss structure, the stability of the X-direction reinforcement truss 1 must be observed at all times.

[0041] The specific steps for dismantling the reinforcement truss are as follows: dismantling the upper chord, web and lower chord of the reinforcement truss in sequence. Since the fixing methods thereof are all bolted, the dismantling is facilitated.

[0042] In an embodiment of the present invention, the Y-direction connecting beam 5 is an I-beam.

[0043] In summary, the reinforcement and lifting method of a multi-truss structure disclosed in the present invention is mainly to set a reinforcement truss at a position near the cantilever end of each single truss to reinforce the cantilever end of each single truss into an integral lifting unit, thereby ensuring the overall stability of the truss when it is lifted, so that when the steel structure is lifted as a whole, the main structure truss can be reinforced in a manner that constrains the freedom of its end. Specifically, during the ground assembly stage of the main structure truss, an auxiliary X-axis reinforcement truss that can be used rotatably is set as a reinforcement measure to increase the overall stability when the main structure trusses are lifted, thereby smoothly realizing the overall lifting of the truss into place. The length of the reinforcement truss can automatically increase as the number of main structure trusses increases, the measures are less, and the structural composition is simple. At the same time, this type of reinforcement method has a wide range of applications, and is also applicable to the overall lifting of multiple trusses in certain special circumstances where individual trusses cannot be provided with lifting points.

[0044] Those skilled in the art should understand that they can implement variations by combining the prior art with the above embodiments, which will not be described in detail here. Such variations do not affect the essence of the present invention and will not be described in detail here.

[0045] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-mentioned disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A reinforcement and lifting method for a multi-span truss structure, applied to the reinforcement and lifting of a multi-span truss structure without an X-direction connecting beam, wherein the multi-span truss structure includes a first X-direction truss, a second X-direction truss, a Y-direction multi-span truss, and a Y-direction connecting beam, wherein each single truss of the Y-direction multi-span truss includes a first end and a second end arranged opposite to the first end, the first end of each single truss of the Y-direction multi-span truss is fixed to the first X-direction truss, and the first X-direction truss and the second X-direction truss are fixedly connected together by the Y-direction connecting beam, characterized in that: The method comprises the following steps: Step S1: Design an X-direction reinforcement truss according to the design drawing of the multi-span truss structure, which is used to reinforce and connect each single truss in the Y-direction multi-span truss, and the connection between the X-direction reinforcement truss and each single truss is arranged adjacent to the second end of the single truss; wherein the shape, size and installation position of the X-direction reinforcement truss are determined according to the design drawing of the multi-span truss structure, and the design drawing of the multi-span truss structure is deepened according to the shape, size and installation position of the reinforcement truss to form a design drawing of a combined truss structure spliced ​​with the X-direction reinforcement truss Step S2: assembling the X-direction reinforcement truss and the multiple truss structures together to form a combined truss structure according to the refined design drawing; Step S3: Setting a hanging point at the free end of each truss in the combined truss structure; Step S4: using the lifting points to lift the combined truss structure to the installation position of the multiple truss structures, and after the multiple truss structures are welded to the surrounding structures, the reinforcement trusses are removed.

2. The reinforcement and lifting method of multiple trusses according to claim 1, characterized in that: The distance between the connection point between the X-direction reinforcement truss and the single truss and the second end of the single truss is 1 to 2 meters.

3. The reinforcement and lifting method of multiple trusses according to claim 1, characterized in that: The Y-direction connecting beam is an I-beam.

4. The reinforcement and lifting method of multiple trusses according to claim 1, characterized in that: In step S2: Assembling to form the first X-direction truss and the second X-direction truss; After the lower chords of each single truss in the Y-direction multi-truss are connected to the lower chords of the first X-direction truss, the lower chords of the X-direction reinforcement trusses are detachably fixed to the lower chords of each single truss; After the upper chords of each single truss in the Y-direction multi-truss are connected to the upper chord of the first X-direction truss, the upper chords of the X-direction reinforcement truss are detachably fixed to the upper chords of each single truss; After the web members of each single truss in the Y-direction multi-truss are assembled in place, the connection between each Y-direction connecting beam and the upper chords of the first X-direction truss, the second X-direction truss and the X-direction reinforcement truss is completed; The installation of the web members of the X-direction reinforcement truss is completed.

5. The reinforcement and lifting method of multiple trusses according to claim 4, characterized in that: The web members of the X-direction reinforcement truss include diagonal web members and straight web members.

6. The reinforcement and lifting method of multiple trusses according to claim 4, characterized in that: In step S4, the specific steps of dismantling the reinforcement truss are: Remove the upper chord, web and lower chord of the reinforcement truss in sequence.

7. The reinforcement and lifting method for multiple trusses according to claim 4, characterized in that: Fixing the lower chord of the X-direction reinforcement truss to the lower chord of each single truss by bolts; Fixing the upper chord of the X-direction reinforcement truss to the upper chord of each single truss by bolts; The web members of the X-direction reinforcement trusses are installed by means of bolts.

8. The reinforcement and lifting method for multiple trusses according to claim 1, characterized in that: The Y-direction multi-span trusses are three-span trusses.

Images