Net rack coal shed extending and reinforcing structure and construction method thereof

Abstract

The invention discloses a net rack coal shed extending and reinforcing structure and a construction method thereof. The net rack coal shed extending and reinforcing structure comprises an original net rack, a newly-built net rack and a reinforcing truss. The original net rack is an upper chord supporting net rack or a lower chord supporting net rack; the newly-built net rack is an upper chord supporting net rack or a lower chord supporting net rack corresponding to the original net rack; the reinforcing truss is arranged between an original net rack and a newly-built net rack and comprises a truss foundation, a truss upper chord member, a truss lower chord member and a truss web member. The truss upper chord member or the truss lower chord member is anchored on the truss foundation; and two ends of the truss web member are respectively welded or bolted and fixed with the upper chord of the truss, the original net rack, the upper chord of the newly-built net rack, the lower chord of the truss, the original net rack and the lower chord of the newly-built net rack. The original net rack and the newly-built net rack are connected through the reinforcing truss, the original net rack and the newly-built net rack are the same in structural form, the reinforcing truss is used for prolonging and reinforcing the original net rack, the original net rack does not need to be dismantled and rebuilt for a steel structure net rack transformation project, and economic benefits are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure net rack, more particularly to a net rack coal shed extension reinforcing structure and a construction method thereof. BACKGROUND

[0002] In recent years, although the development and utilization of new energy sources have been increasing, the energy structure of the power industry is still dominated by thermal power generation, and the coal-fired power plant is the main part of the thermal power plant. The coal storage yard of the coal-fired power plant is mostly a bucket wheel machine strip open coal storage yard, which causes serious environmental pollution around the power plant. Although certain dust control measures have been taken, there are still many uncontrollable factors, and the pollution problem cannot be fundamentally solved. Especially with the implementation of the environmental air quality standard and the urban air quality index PM2.5 requirement, the environmental protection problem faced by the coal storage yard of the coal-fired power plant is becoming more and more severe. According to the development trend and measures of environmental protection, the full-closed form of the open coal storage yard is the inevitable result of development.

[0003] The strip full-closed coal storage yard (referred to as strip coal shed) is widely used in coal-fired power plants because it fully adapts to the bucket wheel machine site and does not need to replace large coal yard mechanical equipment. However, due to the characteristics of large land occupation, low land utilization rate, limited automation level of coal yard operation, and high engineering cost, the construction party faces not small operating pressure and management difficulty, so some coal-fired power plants only fully close part of the coal storage yard, and then fully close the remaining open coal storage yard when the operation is improved. When fully closing again, due to the factors of natural weather conditions, natural environmental erosion, structural safety, bearing capacity, service life, etc., the original closed coal shed is usually completely demolished and re-planned and constructed, resulting in serious waste of resources.

[0004] Therefore, how to provide a strip coal shed extension reinforcing structure which is practical, cost-controllable, safe and reliable, and economic and environmentally friendly is a problem that needs to be solved by those skilled in the art. SUMMARY

[0005] Therefore, the present application provides a net rack coal shed extension reinforcing structure and a construction method thereof, which strengthens the connection between the original net rack and the newly-built net rack through the reinforcing truss, without the need to demolish and rebuild the original net rack, thereby providing a practical, cost-controllable, safe and reliable, and economic and environmentally friendly construction scheme for the steel structure net rack reconstruction, and having certain economic, environmental and social benefits, and being worthy of wide application and promotion.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A net rack coal shed extension reinforcing structure, comprising an original net rack, a newly-built net rack and a reinforcing truss.

[0008] The original net rack is an upper chord support net rack or a lower chord support net rack; the newly-built net rack is an upper chord support net rack or a lower chord support net rack corresponding to the original net rack;

[0009] The reinforcing truss is arranged between the original net rack and the newly-built net rack; the reinforcing truss comprises a truss base, a truss upper chord, a truss lower chord and a truss web; the truss upper chord or the truss lower chord is anchored on the truss base; the two ends of the truss web are respectively welded or bolted to the truss upper chord and the upper chords of the original net rack and the newly-built net rack and the truss lower chord and the lower chords of the original net rack and the newly-built net rack.

[0010] The beneficial effects of the technical scheme of the present application are that the original net rack and the newly-built net rack are connected by the reinforcing truss, the structural forms of the original net rack and the newly-built net rack are the same, the original net rack is extended and reinforced by the reinforcing truss, and for the steel structure net rack reconstruction project, the original net rack does not need to be removed and reconstructed, thereby greatly improving the economic benefits.

[0011] Preferably, the number of the truss upper chords is two, the number of the truss lower chords is one, and the number of the truss webs is multiple; the two ends of the multiple truss webs are respectively welded or bolted to the rod walls of the two truss upper chords and the truss lower chord to form a triangular upper chord reinforcing truss.

[0012] Preferably, the number of the truss upper chords is one, the number of the truss lower chords is two, and the number of the truss webs is multiple; the two ends of the multiple truss webs are respectively welded or bolted to the rod walls of the truss upper chord and the two truss lower chords to form a triangular lower chord reinforcing truss.

[0013] Preferably, a stiffened plate is welded between the outer wall of the truss web and the outer wall of the truss upper chord or the truss lower chord.

[0014] Preferably, the thickness of the stiffened plate is not less than 1 cm.

[0015] Preferably, the top of the original net rack, the newly-built net rack and the reinforcing truss is fixed with a color steel plate.

[0016] Preferably, a connecting web is fixed between the upper chord and the lower chord.

[0017] Preferably, the truss base comprises a pile foundation, a bearing platform, a connecting column and a retaining wall which are sequentially anchored from top to bottom.

[0018] Preferably, the net rack base of the newly-built net rack and the truss base are the same in structure as the net rack base of the original net rack.

[0019] The application further provides a method for prolonging and reinforcing a net rack coal shed, which adopts the net rack coal shed prolonging and reinforcing structure in the technical scheme and comprises the following steps:

[0020] S1, removing the outermost gable foundation and auxiliary structure of the original net rack and retaining the net rack foundation of the original net rack;

[0021] S2, constructing a truss foundation between the net rack foundation of the original net rack and the newly-built net rack;

[0022] S3, constructing the reinforcing truss and the newly-built net rack, and installing the upper chord, the lower chord and the web of the truss;

[0023] S4, removing at least two bays of the original net rack close to the reinforcing truss and rebuilding the removed net rack, wherein the rebuilt net rack has the same shape and size as the original net rack;

[0024] S5, connecting the reinforcing truss with the newly-built net rack and the rebuilt net rack.

[0025] According to the technical scheme, compared with the prior art, the application provides a net rack coal shed prolonging and reinforcing structure and a construction method thereof, the original net rack and the newly-built net rack are connected through the reinforcing truss, the original net rack does not need to be removed and rebuilt, the bearing requirement after prolonging and reinforcing is met, a feasible, controllable, safe, reliable, economical and environmentally-friendly construction scheme is provided for the steel structure net rack reconstruction, and the application has certain economic, environmental and social benefits, and is worth being widely applied and promoted. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0027] Figure 1 A plan view of the net rack coal shed prolonging and reinforcing structure provided by the application is shown in the figure;

[0028] Figure 2 A cross-sectional view of the original net rack provided by the application is shown in the figure;

[0029] Figure 3 A cross-sectional view of the reinforcing truss provided by the application is shown in the figure;

[0030] Figure 4 A schematic view of the reinforcing truss joint provided by the application is shown in the figure.

[0031] Wherein, 1-original net rack; 11-net rack; 2-newly-built net rack; 3-strengthened truss; 31-truss foundation; 32-upper chord of truss; 33-lower chord of truss; 34-web member of truss; 35-stiffener; 4-color steel plate; 5-net rack foundation; 6-upper chord; 7-lower chord; 8-connecting web member. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0033] Embodiment 1

[0034] The embodiment of the present application discloses a net rack coal shed extension and reinforcement structure, which comprises an original net rack 1, a newly-built net rack 2 and a strengthened truss 3; the original net rack 1 is an upper chord support net rack or a lower chord support net rack; the newly-built net rack 2 is an upper chord support net rack or a lower chord support net rack corresponding to the original net rack 1; the strengthened truss 3 is arranged between the original net rack 1 and the newly-built net rack 2; the strengthened truss 3 comprises a truss foundation 31, a truss upper chord 32, a truss lower chord 33 and a truss web member 34; the truss upper chord 32 or the truss lower chord 33 is anchored on the truss foundation 31; when the original net rack 1 is an upper chord support net rack, the number of the truss upper chord 32 is two, the number of the truss lower chord 33 is one, and the number of the truss web member 34 is a plurality of, and the two ends of the plurality of truss web members 34 are respectively welded or bolted to the wall of the two truss upper chords 32 and the truss lower chord 33 to form a triangular upper chord strengthened truss; when the original net rack 1 is a lower chord support net rack, the number of the truss upper chord 32 is one, the number of the truss lower chord 33 is two, and the number of the truss web member 34 is a plurality of, and the two ends of the plurality of truss web members 34 are respectively welded or bolted to the wall of the truss upper chord 32 and the two truss lower chords 33 to form a triangular lower chord strengthened truss; when the strengthened truss 3 connects the original net rack 1 and the newly-built net rack 2, the two ends of the truss web member 34 are respectively welded or bolted to the truss upper chord 32 and the upper chord 6 of the original net rack 1 and the newly-built net rack 2 and the truss lower chord 33 and the lower chord 7 of the original net rack 1 and the newly-built net rack 2 to form an integral stable net rack extension and reinforcement structure. The connecting web member 8 is fixed between the upper chord 6 and the lower chord 7.

[0035] In order to further optimize the above technical solutions and improve the overall stiffness and carrying capacity of the strengthened truss, the stiffener 35 is welded between the outer wall of the truss web member 34 and the outer wall of the truss upper chord 32 or the truss lower chord 33; the thickness of the stiffener 35 is not less than 1 cm.

[0036] In the embodiment, the top of the original grid 1, the newly-built grid 2 and the reinforced truss 3 is fixed with a color steel plate 4. The outer surface of the original grid 1, the newly-built grid 2 and the reinforced truss 3 is covered by the color steel plate 4.

[0037] As shown in Figure 2 The grid is a top chord support bolt ball double-layer grid structure form, the top chord ball head is fixed with a purlin support, a plurality of purlin supports are fixed with purlin strips, and the color steel plate is fixed on the purlin strips by self-tapping screws. In addition, the top chord ball head is also used to connect the reinforced truss and the grid. For the top chord support form, the truss top chord rod is bolted or welded with the top chord ball head of the original grid and the newly-built grid, so that the reinforced truss and the original grid and the newly-built grid are connected as a whole. In order to ensure the overall bearing capacity of the grid extension and reinforcement, at least two sets of grids near the reinforced truss position of the original grid need to be removed and rebuilt when connecting the reinforced truss. The rebuilt grid has the same structure as the two sets of removed grids.

[0038] In order to further optimize the above technical solution and ensure the overall consistency of the grid extension and reinforcement structure, the grid foundation 5 and the truss foundation 31 of the newly-built grid 2 are the same as the grid foundation 5 of the original grid 1.

[0039] In other specific embodiments, the truss foundation 31 includes a pile foundation, a bearing platform, a connecting column and a retaining wall which are sequentially anchored from top to bottom.

[0040] In order to further optimize the above technical solution, facilitate the maintenance and maintenance of the grid, longitudinal horse tracks are provided on the original grid and the newly-built grid.

[0041] Embodiment 2

[0042] According to the grid coal shed extension and reinforcement method of the embodiment, a grid coal shed extension and reinforcement structure in embodiment 1 is used, and a certain thermal power plant reconstruction project is taken as an example. According to different stress modes, the double-layer grid structure building is divided into a top chord support structure form grid and a bottom chord support structure form grid. According to different node connection modes, the grid structure building can be divided into a bolt ball grid, a welded ball grid and a hybrid connection grid. The embodiment is described by taking the top chord support bolt ball double-layer grid as an example, and the technical solutions of the welded ball grid and the hybrid connection grid are the same as those of the bolt ball grid.

[0043] The certain thermal power plant has four-stage projects, a total of 18 open bucket wheel machine coal storage yards, which are reconstructed in four batches.

[0044] The first-stage project installs two 600 MW subcritical coal-fired units, and the coal storage yard covers an area of 422 m x 280 m (length x width), and is equipped with three bucket wheel stacker-reclaimers. The first batch of the fully-enclosed reconstruction project includes the construction of No. 1 coal shed (128 m x 86 m x 39 m) (length x width x height), No. 2 coal shed (260 m x 80 m x 35 m) (length x width x height), and No. 3 coal shed (260 m x 86 m x 39 m) (length x width x height). The coal sheds are all of the upper chord support bolt ball double-layer net rack structure type. The subsequent extension and reconstruction project (the third batch) includes the extension and reconstruction of the original No. 2 coal shed (180 m x 80 m x 35 m) (length x width x height) and the original No. 3 coal shed (180 m x 86 m x 39 m) (length x width x height).

[0045] The second-stage project installs three 600 MW critical coal-fired units, and the coal storage yard covers an area of 422 m x 280 m (length x width), and is equipped with three bucket wheel stacker-reclaimers. The second batch of the fully-enclosed reconstruction project of the second-stage project was implemented in 2019, and includes the extension and reconstruction of the original No. 5 steel structure dry coal shed (150 m x 94 m x 40 m) (length x width x height) by 200 m, the construction of No. 1 gas membrane coal shed (350 m x 80 m x 35 m) (length x width x height), and No. 2 gas membrane coal shed (350 m x 80 m x 35 m) (length x width x height).

[0046] The third-stage project installs two 1,000 MW ultra-supercritical coal-fired units, and the coal storage yard covers an area of 390 m x 218 m (length x width), and is equipped with two bucket wheel stacker-reclaimers. The first batch of the fully-enclosed reconstruction project of the third-stage project includes the construction of No. 7 coal shed (245 m x 101 m x 43 m) (length x width x height) and No. 8 coal shed (245 m x 101 m x 43 m) (length x width x height). The coal sheds are all of the upper chord support bolt ball double-layer net rack structure type. The subsequent extension and reconstruction project (the third batch) includes the extension and reconstruction of the original No. 7 coal shed (145 m x 101 m x 43 m) (length x width x height) and the original No. 8 coal shed (145 m x 101 m x 43 m) (length x width x height).

[0047] The fourth batch of full-closed transformation project includes the extension transformation of the original No. 1 coal shed and the construction of No. 9 strip-shaped coal shed. The original No. 1 coal shed (128m x 86m x 39m) is reinforced and extended (312m x 86m x 39m) (length x width x height), and No. 9 coal shed (445m x 110m x 45m) is newly built (length x width x height). Among them, the size of the extended and transformed original No. 1 coal shed is (440m x 86m x 39m) (length x width x height).

[0048] The full-closed coal shed of the grid structure mainly consists of the civil engineering part, the steel structure part and the auxiliary system. The civil engineering part mainly consists of piles, pile caps, connecting columns, gables, gates and safety fire passages. The steel structure part mainly consists of upper chords, lower chords, web members, ladders and transverse and longitudinal horse tracks, ventilation devices, purlins and enclosure structures (lighting belts, color steel plates, compression strips, etc.). The auxiliary system includes lighting systems, lightning protection grounding systems, dust suppression systems, safety monitoring systems, fire fighting systems, etc. The auxiliary system is usually arranged on the longitudinal horse track or the retaining wall for convenient maintenance and repair.

[0049] The full-closed coal shed consists of the original No. 1 coal shed (128m in length) and the extension transformation project (312m in length). The original No. 1 coal shed is a double-layer grid structure with upper chord support bolted ball, and the extension transformation project still adopts the double-layer grid structure with upper chord support bolted ball, with the same size as the original coal shed.

[0050] According to the results obtained from relevant engineering examples and relevant data queries, the conventional method for the extension transformation of the original No. 1 coal shed is to "demolish the original coal shed with a length of 128m, and newly design and build a new coal shed with a length of 440m". After model wind tunnel test verification, numerical simulation wind tunnel test review and professional design, a new extension and reinforcement technical transformation method for the extension transformation of the original No. 1 coal shed is proposed, including the following steps:

[0051] S1, demolish the gable foundation and auxiliary structure of the outermost side of the original grid 1 (original No. 1 coal shed), and retain the grid foundation 5 of the original grid 1;

[0052] S2, construct a truss foundation 31 between the grid foundation of the original grid 1 and the newly built grid 2 (extension transformation project); the truss foundation 31 is connected with the outermost grid foundation of the original grid 1

[0053] S3, construct the reinforced truss 3 and the newly built grid 2; install the truss upper chord 32, the truss lower chord 33 and the truss web member 34;

[0054] S4, at least two bays of the original net rack 1 close to the side of the reinforced truss 3 are removed and rebuilt, the rebuilt net rack is the same as the original net rack 1 in shape and size;

[0055] S5, the reinforced truss 3 is connected with the newly built net rack 2 and the rebuilt net rack.

[0056] The embodiment has the characteristics of full sealing, safety, environmental protection, unchanged appearance, less resource waste, good economic benefit, controllable and mature technical route, and certain investment income, environmental benefit and social benefit.

[0057] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0058] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A structure for extending and reinforcing a grid-frame coal shed, characterized in that, It includes the existing space frame (1), the newly built space frame (2), and the reinforced truss (3); The original space frame (1) is an upper chord supported space frame or a lower chord supported space frame; the newly built space frame (2) is an upper chord supported space frame or a lower chord supported space frame corresponding to the original space frame (1); The reinforcing truss (3) is placed between the original space frame (1) and the newly built space frame (2); the reinforcing truss (3) includes a truss foundation (31), a truss upper chord (32), a truss lower chord (33) and a truss web member (34); the truss upper chord (32) or the truss lower chord (33) is anchored to the truss foundation (31); the two ends of the truss web member (34) are respectively welded or bolted to the truss upper chord (32) and the upper chord (6) of the original space frame (1) and the newly built space frame (2), and the truss lower chord (33) and the lower chord (7) of the original space frame (1) and the newly built space frame (2).

2. The grid-frame coal shed extension and reinforcement structure according to claim 1, characterized in that, The truss has two upper chord members (32), one lower chord member (33), and multiple web members (34). The two ends of the multiple web members (34) are welded or bolted to the walls of the two upper chord members (32) and the lower chord member (33) to form a triangular upper chord reinforced truss.

3. The grid-frame coal shed extension and reinforcement structure according to claim 1, characterized in that, The truss has one upper chord (32), two lower chords (33), and multiple web members (34). The two ends of the multiple web members (34) are respectively welded or bolted to the upper chord (32) and the two lower chords (33) to form a triangular lower chord reinforced truss.

4. A grid-frame coal shed extension and reinforcement structure according to claim 2 or 3, characterized in that, A stiffening plate (35) is welded between the outer wall of the truss web member (34) and the outer wall of the truss upper chord member (32) or the truss lower chord member (33).

5. The grid-frame coal shed extension and reinforcement structure according to claim 4, characterized in that, The thickness of the stiffening plate (35) is not less than 1 cm.

6. The grid-frame coal shed extension and reinforcement structure according to claim 1, characterized in that, The top of the original space frame (1), the newly built space frame (2) and the reinforcing truss (3) are fixed with color steel plates (4).

7. The grid-frame coal shed extension and reinforcement structure according to claim 1, characterized in that, A connecting web member (8) is fixed between the upper chord (6) and the lower chord (7).

8. The grid-frame coal shed extension and reinforcement structure according to claim 1, characterized in that, The truss foundation (31) includes piles, pile caps, connecting columns and retaining walls anchored sequentially from top to bottom.

9. The grid-frame coal shed extension and reinforcement structure according to claim 8, characterized in that, The structure of the new space frame (2) foundation (5) and the truss foundation (31) are the same as that of the original space frame (1) foundation (5).

10. A method for extending and reinforcing a grid-frame coal shed, characterized in that, The method of using a grid-frame coal shed extension and reinforcement structure according to any one of claims 1 to 9 includes the following steps: S1. Remove the outermost gable foundation and auxiliary structure of the original space frame (1), and retain the space frame foundation (5) of the original space frame (1); S2. Construct a truss foundation (31) between the existing space frame (1) and the new space frame (2); S3, Construction of reinforced truss (3) and new space frame (2); Installation of truss upper chord (32), truss lower chord (33) and truss web members (34); S4. Remove at least two space frames (11) on the side of the original space frame (1) closest to the reinforcing truss (3) and rebuild them. The rebuilt space frame shall have the same shape and size as the original space frame (1). S5. The reinforced truss (3) is connected to the newly built space frame (2) and the reconstructed space frame.

Images