CN115726468A - Modular assembly type steel structure system - Google Patents

Abstract

The invention particularly relates to a modularized assembly type steel structure system which comprises a steel structure module and a connecting assembly. Wherein, the steel construction module includes frame box and a plurality of short anti side force assembly of striding, and the frame box includes four top module roof beams, four bottom module roof beams and four module posts. The short span lateral force resisting assembly comprises two connecting plates arranged at intervals in the height direction and a short span structure arranged between the two connecting plates, one of the two connecting plates is slidably connected with the bottom module beam, and the other of the two connecting plates is slidably connected with the top module beam. The connecting assembly is used for connecting two adjacent steel structure modules. According to the modular assembly type steel structure system, the short-span lateral force resisting assembly is movably arranged between the bottom module beam and the top module beam, so that the lateral rigidity resistance of the stacked box module structure is improved, meanwhile, the requirements of design, later-stage reconstruction and reconstruction after dismantling are met, and the recycling of a steel structure module is realized.

Description

Modular assembly type steel structure system

Technical Field

The invention belongs to the technical field of steel structures, and particularly relates to a modularized assembly type steel structure system.

Background

Steel structures are steel products such as steel plates, section steel, steel pipes, and wire ropes; the structure is in a heavy-load, high-rise, large-span and light structure form formed by welding, riveting, bolts and the like. The steel structure is widely applied to industries such as house buildings, large bridges, ships and the like because of light dead weight and simple and convenient construction. With the application and development of large-scale, factory and assembly of bridge steel structures; large steel structural preforms are becoming more common.

The modularized steel structure has high prefabrication degree, high construction speed and no water and dust on site, and thus, the modularized steel structure has great popularization value. At present, the modularized steel structure is generally divided into a stacked box module structure, a stacked box-lateral force resisting structure, and the like, wherein the stacked box module structure is a structural system formed by stacking box type steel structure modules.

However, the connection between the box-type steel structure modules is generally realized by adopting connecting plate bolts or bolt type connection, the connection rigidity is weaker, the lateral stiffness of the stacked box module structure is smaller, the stacked box module structure is only suitable for a low-layer structure, the large-span support is arranged in the modules to improve the lateral stiffness, and the large-span support is difficult to flexibly arrange and cannot move along with the reconstruction requirement after later-stage transformation and disassembly, so that the cyclic utilization of the stacked box module structure is ensured.

Disclosure of Invention

The invention aims to at least solve the problems that the side-resisting rigidity of the existing stack module structure is low and the stack module structure cannot be recycled. The purpose is realized by the following technical scheme:

a first aspect of the present invention provides a modular assembly steel structural system comprising:

the steel structure module comprises a frame box body and a plurality of short-span lateral force resisting components; the frame box body comprises four top module beams, four bottom module beams and four module columns; the short span lateral force resisting assembly comprises two connecting plates arranged at intervals in the height direction and a short span structure arranged between the two connecting plates, wherein one of the two connecting plates is slidably connected with the bottom module beam, and the other one of the two connecting plates is slidably connected with the top module beam;

and the connecting assembly is used for connecting two adjacent steel structure modules.

The modular assembly type steel structure system comprises the steel structure module and the connecting assembly, the short-span lateral force resisting assembly with the two connecting plates and the short-span structure can be guaranteed to have good structural rigidity, and the short-span lateral force resisting assemblies are arranged between the bottom module beam and the top module beam, so that the lateral rigidity of the steel structure module can be effectively improved, and the lateral rigidity of the stacked box module structure can be improved. Simultaneously, with the movably setting of short-span anti lateral force subassembly between bottom module roof beam and top module roof beam, not only can adjust steel structural module's anti lateral stiffness according to actual installation condition, also can rebuild the back and rebuild the demand and adjust in the later stage, but realized steel structural module's cyclic utilization, help constructing the recoverable building of low carbon.

In addition, the modular assembly type steel structure system according to the invention can also have the following additional technical characteristics:

in some embodiments of the present invention, a pillar is further disposed between the two connecting plates, and the short span structure is fixedly connected to the pillar.

In some embodiments of the invention, the top module beam and the top module beam are each provided with two fixed plates arranged at intervals, and the connecting plate is provided with a sliding plate movably inserted between the two fixed plates.

In some embodiments of the present invention, the fixed plate and the sliding plate are both provided with a limiting hole, and the fixed plate and the sliding plate are fixedly connected through a limiting member capable of penetrating through the limiting hole.

In some embodiments of the present invention, the short span structure is a short span support structure, the short span support structure comprises a plurality of support rods, and the support rods are disposed between two of the connection plates.

In some embodiments of the present invention, the short span support structure is one of a K-type, a W-type, a cross-type, a Z-type, and a monoclinic type.

In some embodiments of the invention, the short span structure is a short span steel plate wall structure comprising a steel plate connected to two of the connection plates.

In some embodiments of the present invention, the steel plate is provided with a plurality of stiffening ribs spaced apart in a height direction.

In some embodiments of the invention, the connection assembly comprises:

the auxiliary piece is arranged on a connecting node between two adjacent steel structure modules;

and the connecting piece is used for connecting the auxiliary piece and the steel structure module.

In some embodiments of the present invention, the top module beam, the bottom module beam and the module post are each provided with a plurality of fixing holes; the auxiliary member includes:

the connecting column can be inserted into the module column of the steel structure module and is provided with a plurality of first mounting holes;

the transverse connecting plate is arranged on the connecting column, and a plurality of second mounting holes are formed in the transverse connecting plate;

the connecting piece passes through the fixing hole and the first mounting hole, or the fixing hole and the second mounting hole are connected with the two steel structure modules.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:

fig. 1 is a schematic structural diagram of a steel structural module according to an embodiment of the present invention;

FIG. 2 is a schematic view of the installation of a short span lateral force resisting assembly according to an embodiment of the present invention;

FIG. 3 is another schematic structural view of the steel structural module according to the embodiment of the present invention;

FIG. 4 is a schematic view of an installation of the connection assembly according to an embodiment of the present invention;

FIG. 5 is a schematic view of one of the auxiliary members according to the embodiment of the present invention;

FIG. 6 is a plan view of a building structure using a modular assembly steel structural system according to an embodiment of the present invention;

FIG. 7 is a schematic comparison of the displacement angle between X-directional levels for the first building structure and the second building structure according to an embodiment of the present invention;

FIG. 8 is a schematic comparison of the displacement angle between Y-directional levels for the first building structure and the second building structure according to an embodiment of the present invention;

the reference symbols in the drawings denote the following:

1. a frame box body; 11. a top module beam; 12. a modular column; 13. a bottom module beam;

2. a short span side force resisting assembly; 21. a pillar; 22. a connecting plate; 23. a support bar; 24. a steel plate; 25. a stiffening rib;

3. a fixing plate; 31. a limiting hole;

4. a sliding plate;

5. a limiting member;

6. a connecting assembly;

7. an auxiliary member; 71. connecting columns; 72. a transverse connection plate; 73. a first mounting hole; 74. a second mounting hole;

8. a connecting member.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "in 8230 \8230; below" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 to 6, according to an embodiment of the present invention, there is provided a modular assembly type steel structural system, which includes a steel structural module and a connection assembly 6 in an overall design.

Wherein, the steel structure module includes frame box 1 and a plurality of short anti side force component 2 of striding. The frame box 1 comprises four top module beams 11, four bottom module beams 13 and four module columns 12. The short span lateral force resisting assembly comprises two connecting plates 22 arranged at intervals in the height direction and a short span structure arranged between the two connecting plates 22, wherein one of the two connecting plates 22 is slidably connected with the bottom module beam 13, and the other of the two connecting plates 22 is slidably connected with the top module beam 11. The connecting assembly 6 is used for connecting two adjacent steel structure modules.

According to the modular assembly type steel structure system, the short-span lateral force resisting assemblies 2 with the two connecting plates 22 and the short-span structure are arranged, so that the short-span lateral force resisting assemblies 2 can be guaranteed to have good structural rigidity, and the short-span lateral force resisting assemblies 2 are arranged between the bottom module beam 13 and the top module beam 11, so that the lateral rigidity of a steel structure module can be effectively improved, and the lateral rigidity of a stacked box module structure is improved. Simultaneously, with the movably setting of short-span anti lateral force subassembly 2 between bottom module roof beam 13 and top module roof beam 11, not only can adjust the anti lateral stiffness of steel construction module according to actual installation condition, also can rebuild the demand and adjust after later stage transformation and demolition, but realized steel construction module's cyclic utilization, help constructing the recoverable building of low carbon.

Specifically, the frame box 1 is formed by splicing at least four top module beams 11, four bottom module beams 13 and four module columns 12. Wherein, top module roof beam 11 and bottom module roof beam 13 are two long roof beams and two short beams, and along direction of height, the long roof beam of top module roof beam 11 and the long roof beam of bottom module roof beam 13 correspond the setting, and the short roof beam of top module roof beam 11 and the short beam of bottom module roof beam 13 correspond the setting to make above-mentioned frame box 1 be the cuboid structure. The short span side force resisting assembly 2 is disposed between the top module beam 11 and the bottom module beam 13.

Still as shown in fig. 1, in the present embodiment, the short span lateral force resisting assembly 2 includes two connecting plates 22 and a short span structure, wherein the short span structure is connected to the two connecting plates 22, so that the short span lateral force resisting assembly 2 forms an integral structure, and the integral structure has better structural strength and can strengthen the structural strength of the steel structure module. Moreover, the two connecting plates 22 are arranged at intervals along the height direction, one of the two connecting plates 22 is slidably connected with the top module beam 11, the other of the two connecting plates 22 is slidably connected with the bottom module beam 13, and at this time, the two connecting plates 22 are the top end and the bottom end of the short span lateral force resisting assembly 2.

In some embodiments of the present invention, a pillar 21 is further connected between the two connecting plates 22, and the short span structure is fixedly connected to the pillar 21. Specifically, the pillars 21 are provided at the left and right ends of the two connection plates 22, respectively, to enable formation of a square structure in which a short span structure is provided inside the square structure and is connected to both the connection plates 22 and the pillars 21. At this time, the number of the pillars 21 is not limited to two, and for example, when the number is three or four, the short span structure and the pillars 21 are also fixedly connected.

Specifically, as shown in fig. 2, two fixed plates 3 are disposed at intervals on each of the top module beam 11 and the bottom module beam 13, and a sliding plate 4 is disposed on the connecting plate 22, and the sliding plate 4 is movably interposed between the two fixed plates 3. In this embodiment, the sliding plate is welded perpendicularly to the connecting plate. The two fixing plates 3 can be constructed into a sliding groove of the sliding plate 4 to form a limiting structure for limiting the short-span lateral force resisting assembly 2 to be separated from the top module beam 11 and the bottom module beam 13, and can also play a role in supporting the short-span lateral force resisting assembly 2, and in addition, the plate-shaped structure is also favorable for production and processing of the top module beam 11 and the bottom module beam 13.

In the present embodiment, both the fixed plate 3 and the sliding plate 4 have a stopper hole, and the fixed plate 3 and the sliding plate 4 are fixedly connected by a stopper 5 that can penetrate the stopper hole. Only the limiting hole 31 arranged on the fixing part 3 is marked in the drawing 2, and the structural form of matching the limiting hole with the limiting part 5 is adopted, so that the difficulty of production and manufacturing of the steel structure module can be effectively reduced, the assembly efficiency of the steel structure module is improved, and the production investment is reduced. In this embodiment, the limiting member 5 is a connecting bolt, which is simple in structure, mature in product, and capable of being directly assembled and used, and is beneficial to improving the installation efficiency of the short-span lateral force resisting assembly 2. Of course, the limiting member 5 may also adopt other connecting members 8 such as a positioning pin and the like for connecting the short span lateral force resisting assembly 2 and the frame box 1.

In some embodiments of the present invention, the short span structure is a short span support structure, wherein the short span support structure comprises a plurality of support bars 23, and the support bars 23 are disposed between two connecting plates 22. The support rod 23 is arranged to further improve the structural strength of the short-span lateral force resisting assembly 2, and meanwhile, the support rod 23 can be fixed on the two connecting plates 22 through welding, so that the assembly is convenient and fast. In the present embodiment, the support rod 23 and the pillar 21 are also fixed by welding.

Specifically, the short span support structure is one of a K-type, a W-type, a cross-type, a Z-type, and a monoclinic type. In this embodiment, the bearing structure is striden to the short time comprises a plurality of bracing pieces 23 through end to end connection, and the bearing structure is whole to be the W type strides to the short time, and the short top welding of striding the bearing structure is located the junction of top connecting plate 22 and pillar 21, the short top welding of striding the bearing structure is located the junction of below connecting plate 22 and pillar 21, the short both sides welding of striding the bearing structure is on pillar 21, so set up, not only be favorable to guaranteeing the short mounting effect of striding the bearing structure, also can effectively improve the short overall structure intensity of striding the bearing structure.

Here, it should be noted that, when the short span support structure adopts one of the K-type, the cross-type, the Z-type and the single-inclined type, the arrangement of the short span support structure refers to the arrangement of the overall W-type short span support structure, and the reinforcing effect of the various short span support structures on the short span lateral force resisting assembly 2 is the same or similar. Of course, the short span support structure is connected to the connecting plate 22, and the short span support structure is connected to the support post 21 by other means, such as bolts, but welding is most convenient.

As another possible embodiment, the short span structure is a short span steel plate wall structure, and the short span steel plate wall structure includes a steel plate 24 connected to two connecting plates 22. As shown in fig. 3, the use of the steel plate 24 for connection also has the effect of improving the structural strength of the short span lateral force resisting assembly 2, and also contributes to improving the applicability of the short span lateral force resisting assembly 2, so that the constructor can select a short span steel plate wall structure or a short span support structure according to actual requirements.

Specifically, a plurality of stiffeners 25 are provided at intervals on the steel plate 24 in the height direction. The steel plate 24 may be partially or completely connected to the connecting plates 22, in this embodiment, the steel plate 24 is fixed to the two connecting plates 22 by welding, and is completely connected to the connecting plates 22, and at this time, the steel plate 24 is also fixedly connected to the strut 21, and the specific connection manner may refer to the fixing manner of the supporting rod 23 or other fixing manners, so as to ensure that the steel plate 24 can strengthen the lateral force resistance of the short span lateral force resistance assembly 2. In order to further improve the reinforcing effect of the short span steel plate wall structure, a plurality of stiffening ribs 25 are further arranged on the steel plate 24, and as shown in fig. 3, the stiffening ribs 25 are distributed on the steel plate 24 at intervals and are fixedly connected with the support column 21, so that the buckling of the steel plate 24 can be prevented, and the lateral resistance of the short span steel plate wall structure is further improved.

In some embodiments of the invention, the above-mentioned connection assembly 6 comprises an auxiliary element 7 and a connection element 8. Wherein, the auxiliary member 7 is arranged on the connection node between two adjacent steel structure modules. The connecting plate 22 is used for connecting the auxiliary 7 and the steel structural module. As shown in fig. 4, on the splicing surface of the steel structure module, the joint of the top module beam 11 and the top module beam 11, or the joint of the top module beam 11 and the module column 12, or the joint of the bottom module beam 13 and the bottom module beam 13, or the joint of the bottom module beam 13 and the module column 12 are all connection points. When two adjacent steel structure modules are spliced, the two connecting points which are close to each other form the connecting node. Meanwhile, the auxiliary member 7 is arranged on the connecting node, and is fixedly connected with the two steel structure modules through the connecting member 8, so that the two steel structure modules are connected.

Specifically, the auxiliary member 7 includes a connecting column 71 and a cross plate 72. The connecting column 71 can be inserted into the module column 12 of the steel structure module, and the cross plate 72 is arranged on the connecting column 71 and is perpendicular to the connecting column 71. As shown in fig. 5, the auxiliary member 7 is disposed between two steel structure modules, and for convenience of description, in the height direction, the steel structure module located below is referred to as a first steel structure module, the steel structure module located above is referred to as a second steel structure module, the cross plate 72 is disposed between the top module beam 11 of the first steel structure module and the bottom module beam 13 of the second steel structure module, and in the horizontal direction, the cross plate 72 may be simultaneously overlapped on the top module beam 11 or the bottom module beam 13 of two adjacent steel structure modules. Fig. 5 shows only one of the structures of the auxiliary member 7.

In the present embodiment, the top module beam 11 and the bottom module beam 13 of the steel structure module are both provided with a plurality of fixing holes, not shown in the figure, a plurality of first mounting holes 73 are provided on the connecting column 71, and a plurality of second mounting holes 74 are provided on the cross plate 72. As also shown in fig. 4 and 5, when the connecting member 8 is used to connect two steel structure modules in the horizontal direction, the connecting member 8 needs to pass through the fixing hole and the second mounting hole 74, and at this time, the connecting member 8 is a general bolt. When connecting piece 8 is used for connecting two steel construction modules on the direction of height, connecting piece 8 need wear through fixed orifices and first mounting hole 73, and this moment, for the convenience of installation is fixed, what connecting piece 8 adopted is to wearing the bolt. In addition, other connecting structures can be additionally arranged on the steel structure module, for example, a vertical connecting plate perpendicular to the transverse connecting plate is additionally arranged on the connecting column 71, so that the connecting effect of the steel structure module in the horizontal direction is further improved.

It should be noted that the connecting assembly 6 may also adopt other structural forms so as to satisfy the requirement of fixedly connecting two adjacent steel structure modules. However, the connecting assembly 6 according to the present embodiment has a simple structure, is easy to manufacture, and has a good fixing effect. As shown in fig. 6, in the horizontal direction, the steel structure modules in this embodiment can be spliced by using the structure shown in the figure, and at this time, the steel structure modules can be spliced and assembled by the connecting assembly 6 without being combined with other lateral force resisting members.

In order to measure the lateral force resistance of the modular assembly type steel structure system according to the present embodiment, a building structure formed by implementing the steel structure modules according to the present invention is referred to as a first building structure and a building structure formed by using the existing steel structure modules is referred to as a second building structure for convenience of description, by comparing the building structure formed by implementing the steel structure modules according to the present invention with the building structure formed by using the existing steel structure modules under the same conditions. Wherein, the second building structure is 17 layers of modularization steel construction that are located 8 degrees seismic fortification intensity. Meanwhile, the X-direction and the Y-direction of the building structure are directions indicated by arrows.

In the embodiment, the interlayer displacement angles of the first building structure and the second building structure are compared, the interlayer displacement angle refers to the ratio delta u/h of the maximum horizontal displacement between the floors to the floor height under the action of wind load or a multi-encounter earthquake standard value calculated by an elastic method, and the delta u/h of the ith floor refers to the maximum value of the displacement difference delta Ui = Ui-Ui-1 between the ith floor and the i-1 th floor at each floor plane. The method is used for ensuring the rigidity of the high-rise structure, and is a macro control index for the section size and the rigidity size of the member.

As can be known from data acquisition, the interlayer displacement angle of the first building structure is 1/576, and the design requirements are met. And as shown in fig. 7 and 8, wherein the solid line is the detection data of the first building structure, and the dotted line is the detection data of the second building structure. By comparison, the first building structure is superior to the second building structure in the comparison of the X-direction interlayer displacement angle, and as shown in fig. 8, the first building structure is superior to the second building structure at a lower floor in the comparison of the Y-direction interlayer displacement angle. And the Y-direction interlayer displacement angle of the first building structure is more the same than that of the second building structure along with the increase of the floor height.

Therefore, the modular assembly type steel structure system has good lateral force resistance, high field installation speed, no water, dust and noise, can be applied to multi-story and high-rise buildings, does not need to be combined with a lateral force resistance structure such as a core barrel with low field installation speed, and can greatly improve the installation speed of the multi-story and high-rise buildings and improve the field environment. Meanwhile, the short-span lateral force resisting assembly 2 can move along with the design requirement, later-stage reconstruction requirement after reconstruction, cyclic utilization of the modules is guaranteed, and low-carbon recyclable buildings are really realized.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A modular assembly steel structural system, comprising:

the steel structure module comprises a frame box body and a plurality of short span lateral force resisting assemblies; the frame box body comprises four top module beams, four bottom module beams and four module columns; the short-span lateral force resisting assembly comprises two connecting plates arranged at intervals in the height direction and a short-span structure arranged between the two connecting plates, wherein one of the two connecting plates is slidably connected with the bottom module beam, and the other of the two connecting plates is slidably connected with the top module beam;

and the connecting assembly is used for connecting two adjacent steel structure modules.

2. The modular fabricated steel structural system of claim 1, wherein a strut is further disposed between the two connecting plates, and the short span structure is fixedly connected to the strut.

3. The modular assembled steel structural system of claim 1, wherein said top module beam and said top module beam are each provided with two spaced apart fixed plates, said connecting plates being provided with a sliding plate movably interposed between said two fixed plates.

4. The modular assembly steel structure system of claim 3, wherein the fixed plate and the sliding plate are both provided with a limiting hole, and the fixed plate and the sliding plate are fixedly connected through a limiting member capable of penetrating through the limiting hole.

5. The modular fabricated steel structural system of claim 1, wherein the short span structure is a short span support structure comprising a plurality of support bars disposed between two of the connecting plates.

6. The modular fabricated steel structural system of claim 5, wherein the short span support structure is one of a K-type, W-type, cross-type, Z-type, and monoclinic type.

7. The modular fabricated steel structural system of claim 1, wherein said short span structure is a short span steel panel wall structure comprising steel panels connected to two of said connecting panels.

8. The modular assembly steel structural system of claim 7, wherein the steel plate is provided with a plurality of stiffeners at intervals in a height direction.

9. The modular fabricated steel structural system of claim 1, wherein the connection assembly comprises:

the auxiliary piece is arranged on a connecting node between two adjacent steel structure modules;

and the connecting piece is used for connecting the auxiliary piece and the steel structure module.

10. The modular assembly steel structural system of claim 9, wherein a plurality of fastening holes are formed in each of the top module beam, the bottom module beam and the module column; the auxiliary member includes:

the connecting column can be inserted into the module column of the steel structure module and is provided with a plurality of first mounting holes;

the transverse connecting plate is arranged on the connecting column and provided with a plurality of second mounting holes;

the connecting piece passes through the fixing hole and the first mounting hole, or the fixing hole and the second mounting hole are connected with the two steel structure modules.

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