Coal bunker trestle and composite color plate mounting method

Abstract

The invention relates to the technical field of coal bunker trestles, and discloses a coal bunker trestle and a composite color plate mounting method.The coal bunker trestle comprises composite steel plates which are laid on the two sides and the top of the trestle to enable the trestle to form annular sealing, and each composite steel plate comprises a rock wool layer; the rock wool layer comprises a high-density rock wool layer, a transition layer and a low-density rock wool layer which are sequentially distributed from outside to inside in a cascade mode, the volume weight content difference of rock wool between every two adjacent rock wool layers is 13.6%-14%, the rock wool layers are layered, the interaction between the adjacent layers is utilized, a certain buffering effect is achieved when the rock wool layers are subjected to instantaneous impact, and the rock wool layers are prevented from falling off. And the rock wool volume weight content of the rock wool layer is optimized, so that the buffer performance is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coal bunker trestle, in particular to a coal bunker trestle and a composite color plate installation method. BACKGROUND

[0002] In the field of coal storage and transportation, coal bunker trestle as an important transfer facility has long been challenged by complex environmental factors and load action. The traditional coal bunker trestle mostly uses single-layer rock wool or simply stacked multi-layer rock wool as the heat preservation and buffering material of composite steel plate. However, due to the limited buffering performance of single-layer rock wool, stress concentration phenomenon is serious when it bears external forces such as instantaneous wind pressure and equipment vibration, which easily leads to local damage and cracking of the material, and it cannot effectively absorb and disperse energy, making it difficult to meet the long-term stable use requirements. For example, in coastal areas, the coal bunker trestle needs to withstand wind pressure load of ≥0.5kPa and salt spray corrosion, and the wind pressure resistance and corrosion resistance of single-layer rock wool are insufficient, with a fiber breakage rate of up to 25% after 100,000 wind pressure cycles, which seriously affects the structural safety and durability.

[0003] The composite steel plate used in the coal bunker trestle of the conventional coal-fired power plant has a rock wool layer, which can have the effects of heat preservation and buffering. However, the rock wool layer is mostly single-layered, and when subjected to instantaneous impact, it may have irreversible local deformation and damage, and subsequently the force conduction in the overall buffer layer may be destroyed due to the local damage, thereby greatly reducing the heat preservation and buffering performance. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is that the composite steel plate used in the coal bunker trestle of the conventional coal-fired power plant has a rock wool layer, which can have the effects of heat preservation and buffering. However, the rock wool layer is mostly single-layered, and when subjected to instantaneous impact, it may have irreversible local deformation and damage.

[0005] The above technical problem is solved by the following technical solution: the present application provides a coal bunker trestle, which includes a composite steel plate, which is laid on both sides and the top of the trestle to form a ring-shaped enclosure, and includes a rock wool layer, which is distributed in stages from outside to inside as a high-density rock wool layer, a transition layer, and a low-density rock wool layer, and the rock wool bulk density content difference between the adjacent two layers of the rock wool layer is 13.6-14%.

[0006] In a preferred embodiment of the coal bunker trestle and the composite color plate installation method described in the present application: the high-density rock wool layer has a rock wool bulk density content of 128-130 kg / m 3 .

[0007] In a preferred embodiment of the coal bunker trestle and composite color plate installation method: the outer surface of the high-density rock wool layer is coated with a nano-silicon dioxide waterproof coating, the coating thickness is 0.1-0.3mm, the water contact angle of the coating is ≥150°, which can effectively prevent rainwater from penetrating, and the coating is added with graphene corrosion-resistant particles.

[0008] In a preferred embodiment of the coal bunker trestle and composite color plate installation method: the transition layer is uniformly distributed with a spiral elastic steel wire mesh, the wire diameter of the steel wire mesh is 0.5-1mm, the pitch is 10-20mm, the elastic steel wire mesh is interwoven with the rock wool fibers, and when the coal bunker trestle is impacted by external force, the elastic steel wire mesh can effectively disperse stress, so that the anti-deformation ability of the transition layer is improved by more than 30%.

[0009] In a preferred embodiment of the coal bunker trestle and composite color plate installation method: a phase change material layer is arranged between the low-density rock wool layer and the inner composite plate, the phase change material is a fatty acid phase change material, and the phase change temperature is 20-25℃; when the internal temperature of the coal bunker trestle changes, the phase change material absorbs or releases heat through solid-liquid phase change, so that the internal temperature fluctuation range of the coal bunker is reduced by more than 50%.

[0010] In a preferred embodiment of the coal bunker trestle and composite color plate installation method: the composite steel plate adopts an arc transition structure at the corner, the arc radius is 100-200mm, and a reinforcing rib plate is arranged in the arc transition area, the thickness of the reinforcing rib plate is 3-5mm, which can reduce the stress concentration coefficient at the corner by 40%, and improve the structural strength and wind resistance of the composite steel plate at the corner.

[0011] In a preferred embodiment of the coal bunker trestle and composite color plate installation method: the reinforcing rib plate is provided with a honeycomb-shaped through hole, the hole diameter of the through hole is 10-20mm, and the hole spacing is 30-50mm; the honeycomb-shaped through hole can reduce the weight of the reinforcing rib plate by 20-30% without reducing the strength of the reinforcing rib plate, and at the same time, the air circulation is enhanced, and the internal stress caused by temperature change is reduced.

[0012] Another object of the present application is to provide a coal bunker trestle and composite color plate installation method, which aims to solve the problem that the construction surface is processed without being treated during the on-site construction process, thereby reducing the corrosion resistance and wear resistance of the later dome

[0013] To solve the above technical problems, the application further provides the following technical scheme: a composite color plate installation method of a coal bunker trestle, which performs cleaning treatment on a gap between newly installed composite color plates and original retaining walls, removes dust, oil stains and loose particles in the gap, ensures that the gap surface is dry and flat, installs a detachable steel formwork at the bottom of a hollow part as a hanging formwork, the thickness of the steel formwork is 2-3 mm, and the steel formwork is fixed to the retaining wall through expansion bolts; aerated concrete slurry is used to fill the gap, and the aerated concrete is vibrated using a small plug-in vibrator during the filling process, the vibration time is controlled to be 10-15 s, and it is ensured that the concrete is dense and has no cavity; and plastic film is covered after pouring to maintain moisture.

[0014] In a preferred embodiment of the coal bunker trestle and the composite color plate installation method, anti-skid ceramic tiles are laid on the surface of the maintained concrete, the original retaining wall damaged ceramic tiles are removed, and the base is cleaned before being re-pasted, so that the surface of the new and old ceramic tiles is flat and has no error platform.

[0015] In a preferred embodiment of the coal bunker trestle and the composite color plate installation method, a sealing groove reserved between the color plate and the upper plane ceramic tile is injected with neutral silicone weatherproof sealant, and the glue joint is ensured to be full and the surface is smooth during injection, so as to form a continuous sealing and waterproof barrier.

[0016] The application has the advantages that: by layering the rock wool layer, the interaction between adjacent layers is utilized to achieve a certain buffering effect when the rock wool layer is subjected to instantaneous impact, and the rock wool bulk density content of the rock wool layer is optimized, so that the buffering performance is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings of the embodiments of the application will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the application, rather than limiting the application. Among them:

[0018] Figure 1 A rock wool layer structure schematic diagram in a coal bunker trestle is shown;

[0019] Figure 2 A gap sealing structure schematic diagram between a composite color plate and an original retaining wall is shown. DETAILED DESCRIPTION

[0020] In order to make those skilled in the art better understand the application, the application will be further described in detail below in combination with specific embodiments and drawings.

[0021] The terms used in the present application are those general terms currently widely used in the art in consideration of the functions regarding the present application, but the terms can be changed according to the intention of those of ordinary skill in the art, precedents, or new technology in the art. Also, specific terms can be selected by the applicant, and in this case, the detailed meanings thereof will be described in the detailed description of the present application. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the general description of the present application.

[0022] Embodiment one

[0023] Referring to Figure 1 The present embodiment provides a coal bunker trestle and composite color plate installation method, which comprises a composite steel plate 1 laid on both sides and the top of the trestle to form a ring-shaped enclosure, which comprises a rock wool layer 11, an aluminum-zinc plated steel plate, wherein the aluminum-zinc content is not less than 150 g / m 2 (75 / 75) that is AZ150 (aluminum-zinc plating ratio: aluminum 55%, zinc 43.5%, and silicon 1.5%), with a thickness of not less than 0.6 mm, the side plate adopts a flat edge process, and the top plate adopts a large edge process (to increase the pressure bearing capacity). The composite plate is filled with 100 mm rock wool with a bulk density of not less than 100 kg / m3. The yield strength of the double-sided aluminum-zinc plated color high-strength profiled steel plate is not less than 250 MPa, and when 360-degree engagement is adopted, the strength should be not less than 350 MPa. The heat reflection performance is good, the surface hardness is ≥120 (HV), the service life of the selected high-strength aluminum-zinc plated profiled steel plate, connection nodes and accessories should be guaranteed for a long time without maintenance in normal atmospheric environment, and the front and back paints of the profiled steel plate do not crack and peel off.

[0024] Specifically, the rock wool bulk density refers to the mass of rock wool per unit volume, and the unit is usually kilogram per cubic meter (kg / m 3 ), which is an important physical performance index of rock wool, reflecting the compactness of rock wool.

[0025] Further, since a single rock wool layer 11 can only buffer itself under the action of extrusion force caused by external force collision, and since it is set as a single layer, the external force is completely borne by the inside of the rock wool layer 11. Since the rock wool content distribution is equal, the buffering capacity is poor, and thus there may be local damage and cracking of the rock wool layer 11. When the rock wool layer 11 is extruded, the stress point will deform, i.e., it cannot form a force relief effect, which will cause the surface of the rock wool layer 11 in contact with the outside to be unable to buffer after being extruded, thereby causing deformation to occur.

[0026] Further, if distributed in multiple layers, different bulk density differences can be set to enable the outer surface to unload after being stressed, starting from the middle layer and finally to the innermost layer to unload to the maximum, so that it can ensure its deformation ability, so as to prevent it from being damaged irreversibly after being collided. The whole rock wool layer 11 is divided into three parts, that is, the thickness of the original rock wool layer 11 is maintained, but it is divided into three parts to bear the initial stress and buffer the stress, and finally the stress is eliminated to the maximum. The three groups of rock wool layers are distributed from the outside to the inside in a stepped manner as the high-density rock wool layer 111, the transition layer 112 and the low-density rock wool layer 113, so that the force borne by the high-density rock wool layer 111 can be transmitted to the transition layer 112, and the difference between the three layers of rock wool layers is considered.

[0027] Further, experiments are carried out: a drop hammer impact testing machine is used to generate instantaneous collision and simulate instantaneous impact pressure. The impact energy is controlled by the weight and height of the drop hammer, the dynamic stress sensor has a sampling frequency of 100 kHz and a range of 0-50 MPa, which is used to capture the stress peak value and distribution at the moment of impact (attached to the interface of the three layers), a high-speed camera is used to record the deformation time sequence of the rock wool layer during the impact (calculate the deformation recovery time), a laser displacement meter is used to measure the residual deformation after impact (compare the initial thickness), a bulk density measuring instrument is used to control the bulk density difference of the three layers of rock wool to provide experimental materials, and a customized impact pad is used to ensure uniform transmission of the impact load to the surface of the rock wool board.

[0028] After multiple tests, 15 groups of relevant experimental data are obtained, wherein:

[0029] The unloading efficiency = (single-layer impact stress - three-layer interface stress peak value) / single-layer stress x 100%;

[0030] The instantaneous deformation recovery rate = (maximum deformation - residual deformation) / maximum deformation x 100%;

[0031] The stress attenuation rate = stress peak value / impact duration (measures the buffering speed).

[0032] First, take experimental materials a group, b group, c group, d group, e group

[0033]

[0034] Table 1: Comparison of uniform and non-uniform rock wool bulk density difference in rock wool layer

[0035] Among them:

[0036] Adjacent bulk density difference: refers to the bulk density difference of each adjacent two layers in the three-layer structure (such as A group 130→112 difference 14%, 112→96 difference 14%);

[0037] Non-adjacent density difference: refers to the total difference between the outer layer and the inner layer (such as A group 130→96 difference 34%), reflecting the overall gradient span.

[0038] According to the experimental data, it can be concluded that the A group (adjacent difference 14%) is 5.7% higher than the B group (adjacent difference not equal) in unloading efficiency, and 5.9% higher in deformation recovery rate, proving that when the adjacent density difference is uniform, the interlayer stress transfer is smoother, the energy dissipation efficiency is improved, and the stress peak of the E group (adjacent difference chaos) is 30.2 MPa, which is 28.5% higher than that of the A group, confirming that disordered difference values will lead to interface stress concentration and significant degradation of unloading performance.

[0039] Although the overall span of the D group (non-adjacent difference 40%, adjacent difference uniform) is large, the unloading efficiency is still 64.2%, which is better than the B / C group with unequal adjacent difference, indicating that the uniformity of adjacent difference is more critical than the non-adjacent difference span. The unloading efficiency of the C group is 8.3% lower than that of the A group with the same non-adjacent difference (34%), proving that the uniformity of adjacent difference is a key factor affecting the unloading effect.

[0040] Subsequently, 15 groups of data about high-density rock wool layer 111, transition layer 112, and low-density rock wool layer 113 are given, in which the adjacent two groups of density difference are uniform, and the experiment is carried out as follows:

[0041]

[0042]

[0043] Table 2: Rock wool density difference in rock wool layer is uniform

[0044] According to the experimental data, it can be concluded that when the density difference is 13.8-14.0%, the unloading efficiency is 63.5%, the instantaneous deformation recovery rate is 94.4%, and the stress attenuation rate is 190 MPa / ms, all three indicators reach the peak value. When the density difference is less than 13.6%, the performance decreases by 2-3% for every 0.5% decrease in unloading efficiency; when the density difference is greater than 14.2%, the performance decreases by 3-4% for every 0.5% increase.

[0045] Further, the rock wool layer 11 is distributed in stages, and the stage distribution is high-density rock wool layer 111, transition layer 112, and low-density rock wool layer 113, and the rock wool density content of the high-density rock wool layer 111 is 128-130 kg / m 3

[0046] Specifically, the three-layer density gradient causes an inertial delay effect of impact energy between layers: the high-density rock wool layer first bears the impact (high inertia), the middle layer is buffered by elastic deformation (delayed for 0.5 ms), and the low-density rock wool layer quickly dissipates the remaining energy with low inertia. The actual impact duration is extended from 1.2 ms of a single layer to 2.8 ms, and the energy dispersion rate is increased by 60%. Under instantaneous impact, the stress peak of the 14% difference three-layer rock wool is 12% lower than that under static loading (dynamic stress relaxation effect), while the single-layer rock wool has almost no stress peak attenuation due to the lack of gradient buffering, which verifies that the three-layer structure has more significant load relief advantage under sudden load.

[0047] Embodiment Two

[0048] With reference to Figure 1 and Figure 2 , the embodiment provides a coal bunker trestle and composite color plate installation method, which comprises that the outer surface of the high-density rock wool layer 111 is coated with a nano-silicon dioxide waterproof coating, the thickness of the coating is 0.1-0.3 mm, the water contact angle of the coating is greater than or equal to 150°, rainwater can be effectively prevented from penetrating, and graphene corrosion-resistant particles are added in the coating, so that the acid and alkali corrosion resistance of the high-density rock wool layer is improved, and the service life of the coal bunker trestle is prolonged. The elastic steel wire mesh is uniformly distributed in the transition layer 112, the wire diameter of the steel wire mesh is 0.5-1 mm, the pitch is 10-20 mm, the elastic steel wire mesh is interwoven with the rock wool fibers, and when the coal bunker trestle is impacted by external force, the elastic steel wire mesh can effectively disperse stress, so that the anti-deformation capacity of the transition layer is improved by more than 30%.

[0049] Further, the composite steel plate 1 further comprises a phase change material layer attached to the low-density rock wool layer 113, the phase change material is a fatty acid phase change material, and the phase change temperature is 20-25℃. When the temperature inside the coal bunker trestle changes, the phase change material absorbs or releases heat through solid-liquid phase change, so that the temperature fluctuation range inside the coal bunker is reduced by more than 50%.

[0050] Specifically, by adding a nano-silicon dioxide waterproof coating and introducing graphene corrosion-resistant particles on the outer surface of the high-density rock wool layer, the waterproof and corrosion-resistant properties are significantly improved without changing the original rock wool structure, solving the problem that the coal bunker trestle is easily corroded in a coastal environment.

[0051] The composite steel plate 1 adopts an arc-shaped transition structure at the corner, the arc-shaped radius is 100-200 mm, and a reinforcing rib plate is arranged in the arc-shaped transition area, the thickness of the reinforcing rib plate is 3-5 mm, the stress concentration coefficient at the corner can be reduced by 40% by the structure, the structural strength and wind resistance of the composite steel plate at the corner are improved, the phase change material layer is introduced between the low-density rock wool layer and the composite plate, and the temperature inside the coal bunker is adjusted by using the temperature control characteristics of the phase change material, so that the problem of affecting the coal storage quality due to temperature change of the coal bunker is solved.

[0052] Further, the reinforcing rib plate is provided with a honeycomb-shaped through hole, the aperture of the through hole is 10-20 mm, the hole spacing is 30-50 mm, the honeycomb-shaped through hole is provided under the premise of not reducing the strength of the reinforcing rib plate, which can reduce the weight of the reinforcing rib plate by 20%-30%, while enhancing air circulation and reducing internal stress caused by temperature change, the honeycomb-shaped through hole is designed on the reinforcing rib plate, which realizes the dual effects of structure weight reduction and performance optimization, and is an improvement and innovation of the traditional reinforcing rib plate structure.

[0053] Example three

[0054] Reference Figure 2 The gap between the newly installed composite color plate and the original retaining wall is cleaned, dust, oil stains and loose particles in the gap are removed, and the surface of the gap is ensured to be dry and flat. A detachable steel formwork is installed at the bottom of the hollow part as a hanging formwork, the thickness of the steel formwork is 2-3 mm, the steel formwork is fixed with the retaining wall through expansion bolts, and the gap is filled with aerated concrete slurry. During the filling process, the aerated concrete is vibrated by using a small plug-in vibrator, and the vibration time is controlled within 10-15 seconds to ensure that the concrete is dense and free of cavities. After pouring, plastic film is covered for moisture curing. Through automatic production and special process treatment, the implementation effect of the innovative structure and material is ensured, and the process innovation and construction quality guarantee advantages are compared with the traditional construction method

[0055] Anti-slip ceramic tiles are laid on the surface of the cured concrete, the damaged ceramic tiles of the original retaining wall are removed, and the base is cleaned and then re-pasted to ensure that the surfaces of the new and old ceramic tiles are flat and free of steps. Step refers to the uneven deviation of the surface of adjacent components during splicing or installation, forming a obvious step-like difference. Such deviation may be caused by construction errors, material deformation, improper base treatment, etc., which may affect the appearance flatness, functional integrity or waterproof performance of the components. A sealing groove is reserved between the color plate and the upper plane ceramic tile, and neutral silicone weatherproof sealant is used for injection. When injecting, the glue joint is ensured to be full and the surface is smooth to form a continuous sealing and waterproof barrier.

[0056] It should finally be pointed out that the methods and devices described in detail above are only embodiments, which the person skilled in the art can modify in different ways, without departing from the scope of the present invention.

Claims

1. A coal storage trestle characterized in that: Comprising, The composite steel plate (1) is laid on both sides and top of the trestle to form a ring-shaped closed trestle, which comprises a rock wool layer (11), the rock wool layer (11) is sequentially distributed with a high-density rock wool layer (111), a transition layer (112) and a low-density rock wool layer (113) from outside to inside; The difference of rock wool bulk density content between the two adjacent layers of the rock wool layer (11) is 13.6-14%.

2. The coal bunker trestle according to claim 1, characterized in that: The high-density rock wool layer (111) has a rock wool bulk density content of 128-130 kg / m 3 .

3. The coal bunker trestle according to claim 2, characterized in that: The outer surface of the high-density rock wool layer (111) is coated with a nano-silicon dioxide waterproof coating, the water contact angle of the coating is greater than or equal to 150°, and the coating is added with graphene anti-corrosion particles.

4. A coal storage trestle according to any one of claims 1 or 3, characterised in that: The transition layer (112) is uniformly distributed with a spiral elastic steel wire mesh, the wire diameter of the steel wire mesh is 0.5-1mm, and the pitch is 10-20mm, and the elastic steel wire mesh is interwoven with the rock wool fibers.

5. The coal bunker trestle according to claim 4, characterized in that: The composite steel plate (1) further comprises a phase change material layer attached to the low-density rock wool layer (113), the phase change material is a fatty acid phase change material, and the phase change temperature is 20-25℃.

6. The coal bunker trestle according to claim 5, characterized in that: The composite steel plate (1) adopts an arc-shaped transition structure at the corner, the arc radius is 100-200mm, and a reinforcing rib plate is arranged in the arc-shaped transition area, and the thickness of the reinforcing rib plate is 3-5mm.

7. The coal bunker trestle according to claim 6, characterized in that: Honeycomb-shaped through holes are formed in the reinforcing rib plate, the hole diameter of the through holes is 10-20mm, the hole spacing is 30-50mm, the setting of the honeycomb-shaped through holes can reduce the weight of the reinforcing rib plate by 20-30% without reducing the strength of the reinforcing rib plate, and at the same time, the air circulation is enhanced, and the internal stress caused by temperature change is reduced.

8. A method of installing a composite panel, characterized by: The coal bunker trestle of any one of claims 1-7 is used to clean the gap between the newly installed composite color plate and the original retaining wall, remove the dust, oil stains and loose particles in the gap, and ensure that the surface of the gap is dry and smooth; A detachable steel formwork is installed at the bottom of the hollow part as a hanging formwork, the thickness of the steel formwork is 2-3mm, and the steel formwork is fixed to the retaining wall by expansion bolts; air-entrained concrete grout is used to fill the gap, and the filling process is carried out in layers; A small plug-in vibrating rod is used to vibrate the air-entrained concrete, the vibrating time is controlled to be 10-15s to ensure that the concrete is dense and has no voids; after pouring, plastic film is covered for moisture curing.

9. The method of claim 8, wherein: Anti-slip ceramic tiles are laid on the surface of the cured concrete, and polymer cement mortar is used for sticking; The damaged ceramic tiles of the original retaining wall are removed, and after cleaning the base, they are re-stuck to ensure that the surfaces of the new and old ceramic tiles are smooth and have no steps.

10. The method of claim 9, wherein: A sealing groove is reserved between the color plate and the upper plane ceramic tile, and neutral silicone weatherproof sealant is used for injection, and the glue joint is full and the surface is smooth to form a continuous waterproof barrier.

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