CN109950853B - Heat-preserving weight-increasing cover plate for railway engineering - Google Patents
Heat-preserving weight-increasing cover plate for railway engineering Download PDFInfo
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- CN109950853B CN109950853B CN201910363220.3A CN201910363220A CN109950853B CN 109950853 B CN109950853 B CN 109950853B CN 201910363220 A CN201910363220 A CN 201910363220A CN 109950853 B CN109950853 B CN 109950853B
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 75
- 230000001965 increasing effect Effects 0.000 claims abstract description 27
- 238000004321 preservation Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003733 fiber-reinforced composite Substances 0.000 claims abstract description 6
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 6
- 239000004567 concrete Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 238000007723 die pressing method Methods 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 230000004584 weight gain Effects 0.000 claims description 3
- 235000019786 weight gain Nutrition 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 16
- 239000010410 layer Substances 0.000 description 57
- 238000009413 insulation Methods 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 8
- 239000011150 reinforced concrete Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
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- 238000005260 corrosion Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 206010023230 Joint stiffness Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a heat-insulating weight-increasing cover plate for railway engineering, wherein a reinforcing rib net is formed by protruding reinforcing ribs which are fixedly connected to the bottom of a panel and criss-cross; the bottom of the reinforcing rib net is provided with a mounting groove, a connecting nut is embedded in the crossing joint of the reinforcing ribs in the mounting groove, and the weight increasing layer and the heat insulating layer are sequentially positioned in the mounting groove from top to bottom; the backboard, the heat preservation layer and the weight increasing layer are respectively provided with bolt holes corresponding to the connecting nuts, the connecting bolts penetrate through the threaded holes to be in threaded connection with the connecting nuts, and the mounting groove is blocked through the backboard; according to the invention, the panel, the reinforcing ribs and the backboard are formed by adopting graphene fiber reinforced composite materials through a high-temperature and high-pressure mould pressing process, so that higher structural strength is ensured, the heat preservation layer and the weight increasing layer can realize the double effects of heat preservation and weight increasing, and the cover plate has the functions of heat preservation and self stability enhancement while having larger carrying capacity.
Description
Technical Field
The invention relates to the technical field of railway engineering, in particular to a heat-insulating weight-increasing cover plate for railway engineering.
Background
In recent years, high-speed railways in China rapidly develop, and a large number of branch railways, inter-city railways and subway lines are planned and built on the basis of the built large number of high-speed railway lines, so that the new trend of railway construction is about to be raised.
On both sides of the railway tunnel, a cable groove for cable laying and a groove for drainage are provided. In order to protect the cable, a cover plate is arranged on the cable trough, and meanwhile, in order to ensure smoothness of the trough and avoid sundries entering the trough, a cover plate is also arranged on the trough.
At present, a cable trough cover plate of a railway prestressed concrete box beam is used as a pavement step plate, and a precast reinforced concrete slab, a precast RPC (reactive powder concrete) slab or a precast inorganic composite concrete slab is usually adopted. The concrete T-shaped beam pavement step plate mainly adopts precast reinforced concrete plates or steel plates, and the precast reinforced concrete plates are easy to crack, open tendons, carbonize and the like, and have the defects of large weight, easy damage, poor heat preservation performance, poor sealing performance, poor integrity and the like.
The steel plate is easy to rust, the prefabricated RPC plate and the prefabricated inorganic composite concrete plate have high requirements on the manufacturing process, and the problems of insufficient strength, cracking or deformation and the like can occur when the quality is poor. In a word, the cable trough cover plate made of traditional materials is easy to deteriorate, the durability is poor, the weight of the traditional cover plate body is heavy, the periodic inspection, maintenance and repair are inconvenient, the cost of work management is high, and when the cover plate is problematic, the influence of blocking a tunnel groove, unsmooth drainage, personal injury, engineering mechanical damage and the like can be caused, so that secondary disasters such as foundation subsidence, ballast ice, influence on operation and the like are caused.
Meanwhile, on one hand, the railway engineering cover plate is generally of a reinforced concrete single-layer integrated structure, and the heat preservation effect cannot be achieved. However, the Chinese operators are wide, and various completely different climates and use conditions exist, so that the requirements on the heat preservation function of the cover plate are different, and the cover plate in a cold use environment is required to have the heat preservation function;
On the other hand, the existing railway has higher train running speed, when the train with higher speed passes through, a stronger negative pressure space is formed near the track, and the existence of the negative pressure environment often affects objects around the track, so that the dead weight of the cover plate also has certain requirements, and the cover plate for railway engineering is required to have certain dead weight so as to resist the negative pressure attractive force generated when the train with high speed passes through.
Therefore, how to provide a heat-insulating weight-increasing cover plate for railway engineering with high structural strength, good heat-insulating performance and large dead weight is a problem to be solved by the person skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a heat-insulating weight-increasing cover plate for railway engineering, wherein a panel and a reinforcing rib are formed by adopting a graphene fiber reinforced composite material through a high-temperature and high-pressure die pressing process, so that higher structural strength is ensured, and the arranged heat-insulating layer can realize excellent heat-insulating effect, so that the cover plate has larger carrying capacity and heat-insulating function, and is suitable for low-temperature occasions; the weight-increasing layer can resist negative pressure attractive force generated when a high-speed train passes, keeps self stability, enables the cover plate to have larger carrying capacity and stronger self stability, and is suitable for being used in high-speed train building engineering occasions; when paving, two adjacent heat-insulating weight-increasing cover plates for railway engineering are connected in a step-type overlapping manner, so that the heat-insulating weight-increasing cover plate has good sealing performance.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A heat-insulating weight-increasing cover plate for railway engineering comprises a panel, a reinforcing rib net, a heat-insulating layer, a weight-increasing layer and a back plate; wherein, the reinforcing rib net is composed of protruding reinforcing ribs which are fixedly connected to the bottom of the panel and criss-cross; the bottom of the reinforcing rib positioned in the middle of the reinforcing rib net is provided with a mounting groove, a connecting nut is pre-buried at the crossing node of the reinforcing rib positioned in the mounting groove, and the weight-increasing layer and the heat-insulating layer are sequentially positioned in the mounting groove from top to bottom; the backboard, the heat preservation layer and the weight-increasing layer are respectively provided with a bolt hole corresponding to the connecting nut, the connecting bolts penetrate through the threaded holes to be in threaded connection with the connecting nuts, and the installation groove is blocked through the backboard.
According to the invention, the panel is fixedly connected with the reinforcing rib net, the overall structural strength is enhanced through the support of the reinforcing rib net on the panel, so that the cover plate has higher carrying capacity, and the mounting groove formed at the bottom of the reinforcing rib net can accommodate the heat-insulating layer with good heat-insulating effect and the weight-increasing layer with weight-increasing effect, so that the cover plate realizes heat insulation and weight-increasing functions under the condition that the overall thickness of the cover plate is not increased; connecting nuts are pre-buried in the crossing joint of the reinforcing ribs in the mounting groove, the backboard is fixed on the opening of the mounting groove through the threaded connection of the connecting nuts and the connecting bolts, the notch of the mounting groove is blocked, the heat-insulating layer and the weight-increasing layer can be lifted below the panel and the reinforcing rib net, the heat-insulating layer and the weight-increasing layer can be sealed, moisture and water are prevented from entering the mounting groove to affect the heat-insulating effect, and residues of the weight-increasing layer are prevented from leaking out through gaps to affect the weight-increasing effect.
Preferably, in the heat-insulating weight-increasing cover plate for railway engineering, one side edge of the panel extends to form a step-type lap joint public edge, and the other opposite side edge of the panel is inwards recessed to form a step-type lap joint female edge matched with the step-type lap joint public edge.
The beneficial effects of adopting above technical scheme are: when paving, can realize the overlap joint between the heat preservation weight gain apron for the adjacent railway engineering to have certain overlap joint leakproofness.
Preferably, in the heat-insulating weight-increasing cover plate for railway engineering, the back plate adopts a groove design with raised periphery, and the groove opening faces away from the heat-insulating layer.
The beneficial effects of adopting above technical scheme are: after the backboard is fixed through the connecting bolt, the protruding groove wall around the backboard can be closely attached to the inner wall of the mounting groove, the mounting groove where the heat preservation layer is located is sealed, moisture and water are prevented from entering the mounting groove to influence the heat preservation effect, and residues generated by friction or vibration and other conditions are prevented from leaking out through gaps in daily use of the weight increasing layer, so that the weight increasing effect is influenced.
Preferably, in the heat-insulating weight-increasing cover plate for railway engineering, grooves corresponding to the raised reinforcing ribs are formed in the weight-increasing layer, so that the weight-increasing layer can be embedded into the reinforcing rib net.
The beneficial effects of adopting above technical scheme are: the weight increasing layer part can be embedded into the reinforcing rib net, so that the grooving depth of the mounting groove is reduced, and the influence of grooving on the reinforcing rib net on the structural strength of the reinforcing rib net is reduced.
Preferably, in the heat-insulating weight-increasing cover plate for railway engineering, the heat-insulating layer is a heat-insulating plate made of polyurethane rigid foam heat-insulating materials, and has a good heat-insulating effect.
Preferably, in the heat-insulating weight-increasing cover plate for railway engineering, the weight-increasing layer is made by solidifying concrete, so that the heat-insulating weight-increasing cover plate has a good weight-increasing effect and is low in cost.
Preferably, in the heat-insulating weight-increasing cover plate for railway engineering, the reinforcing ribs are reinforcing ribs perpendicular to the panel, and the reinforcing ribs which are crisscrossed are perpendicular to each other.
The beneficial effects of adopting above technical scheme are: the structural strength of the reinforcing rib net and the panel is enhanced.
Preferably, in the heat-insulating weight-increasing cover plate for railway engineering, 9 groups of connecting bolts and connecting nuts are arranged in a matching manner and are uniformly distributed on the back plate and the reinforcing rib net respectively, so that the heat-insulating layer and the back plate are uniformly stressed and stably connected.
Preferably, in the heat-insulating weight-increasing cover plate for railway engineering, the connecting bolt is a stainless steel bolt, and the connecting nut is a stainless steel nut, so that corrosion is prevented.
Preferably, in the heat-insulating weight-increasing cover plate for railway engineering, the reinforcing rib net and the panel are of an integrated structure and have strong mechanical properties, and the reinforcing rib net, the panel and the back panel are all integrally manufactured by adopting graphene fiber reinforced composite materials through a high-temperature high-pressure die pressing process.
Compared with the prior art, the invention discloses the heat-insulating weight-increasing cover plate for railway engineering, wherein the panel is fixedly connected with the reinforcing rib net, the panel is forcefully supported by the reinforcing rib net, the reinforcing ribs are reinforcing rib plates perpendicular to the panel, and the reinforcing rib plates crisscrossed vertically and horizontally are mutually perpendicular, so that the integral structural strength of the reinforcing rib net and the panel is enhanced, and the cover plate has higher carrying capacity; the mounting groove arranged at the bottom of the reinforcing rib net can accommodate a heat-insulating layer with good heat-insulating effect and a weight-increasing layer with weight-increasing effect, so that the cover plate realizes heat insulation and weight-increasing functions under the condition that the whole thickness of the cover plate is not increased, and the weight-increasing layer is provided with grooves corresponding to the raised reinforcing ribs, so that the weight-increasing layer can be partially embedded into the reinforcing rib net, the grooving depth of the mounting groove is reduced, and the influence of grooving on the reinforcing rib net on the structural strength of the reinforcing rib net is reduced;
The connecting nuts are pre-buried at the crossing joint of the reinforcing ribs in the mounting groove, the backboard is fixed on the opening of the mounting groove through the spiro union of the connecting nuts and the connecting bolts, the notch of the mounting groove is blocked, the heat insulation layer and the weight increasing layer can be lifted below the panel and the reinforcing rib net, the heat insulation layer and the weight increasing layer can be sealed, the backboard adopts a peripheral protruding groove type design, the groove opening faces away from the heat insulation layer, after the backboard is fixed through the connecting bolts, the peripheral protruding groove walls of the backboard can be tightly attached to the inner wall of the mounting groove, the mounting groove where the heat insulation layer and the weight increasing layer are located is sealed, moisture and water are prevented from entering the mounting groove to influence the heat insulation effect, and residues generated by friction or vibration and the like in daily use are prevented from leaking out through the gaps to influence the weight increasing effect.
One side of the panel extends to form a step-type lap joint public edge, the other opposite side of the panel is inwards sunken to form a step-type lap joint female edge matched with the step-type lap joint public edge, and when paving, lap joint between the heat-insulating weight-increasing cover plates for adjacent railway engineering can be realized, and certain lap joint tightness is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a side view of the present invention;
FIG. 4 is a bottom view of the present invention;
FIG. 5 is a cross-sectional view of the present invention;
Fig. 6 is an assembled view of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a heat-insulating weight-increasing cover plate for railway engineering, which is characterized in that a panel and reinforcing ribs are formed by adopting graphene fiber reinforced composite materials through a high-temperature and high-pressure die pressing process, so that higher structural strength is ensured, and an arranged heat-insulating layer can realize an excellent heat-insulating effect, so that the cover plate has a larger carrying capacity and a heat-insulating function, and is suitable for low-temperature occasions; when paving, two adjacent heat-insulating weight-increasing cover plates for railway engineering are connected in a step-type overlapping manner, so that the heat-insulating weight-increasing cover plate has good sealing performance.
With reference to fig. 1-6, the embodiment of the invention discloses a heat-insulating weight-increasing cover plate for railway engineering, which comprises a face plate 1, a reinforcing rib net 2, a heat-insulating layer 3, a weight-increasing layer 6 and a back plate 4; wherein, the reinforcing rib net 2 is composed of protruding reinforcing ribs which are fixedly connected to the bottom of the panel 1 and criss-cross; the bottom of the reinforcing rib positioned in the middle of the reinforcing rib net 2 is provided with a mounting groove, a connecting nut is pre-embedded at the crossing joint of the reinforcing ribs positioned in the mounting groove, and the weight increasing layer 6 and the heat insulating layer 3 are sequentially positioned in the mounting groove from top to bottom; the backboard 4, the heat preservation layer 3 and the weight increasing layer 6 are respectively provided with bolt holes corresponding to the connecting nuts, the connecting bolts 5 penetrate through the threaded holes to be in threaded connection with the connecting nuts, and the mounting groove is blocked through the backboard 4.
In order to further optimize the technical scheme, one side edge of the panel 1 extends to form a step-type lap joint public edge, and the other opposite side edge of the panel 1 is inwards recessed to form a step-type lap joint female edge matched with the step-type lap joint public edge.
The beneficial effects of adopting above technical scheme are: when paving, can realize the overlap joint between the heat preservation weight gain apron for the adjacent railway engineering to have certain overlap joint leakproofness.
In order to further optimize the technical scheme, the back plate 4 adopts a groove type design with raised periphery, and the opening of the groove faces away from the heat insulation layer 3.
The beneficial effects of adopting above technical scheme are: after the backboard 4 is fixed through the connecting bolt 5, the protruding groove walls around the backboard 4 can be tightly attached to the inner wall of the mounting groove, the mounting groove where the heat preservation layer 3 is located is sealed, moisture and water are prevented from entering the mounting groove to influence the heat preservation effect, and residues generated by friction or vibration and the like in daily use of the weight increasing layer 6 are prevented from leaking out through gaps to influence the weight increasing effect.
In order to further optimize the technical scheme, grooves corresponding to the raised reinforcing ribs are formed in the weight layer 6, so that the weight layer 6 can be partially embedded into the reinforcing rib net 2.
The beneficial effects of adopting above technical scheme are: the weight increasing layer 6 can be partially embedded into the reinforcing rib net 2, so that the grooving depth of the mounting groove is reduced, and the influence of grooving on the reinforcing rib net 2 on the structural strength of the reinforcing rib net is reduced.
In order to further optimize the technical scheme, the heat insulation layer 3 is a heat insulation plate made of polyurethane rigid foam heat insulation materials, and has good heat insulation effect.
In order to further optimize the technical scheme, the weight increasing layer 6 is manufactured by adopting concrete after solidification, so that the weight increasing layer has good weight increasing effect and is low in cost.
In order to further optimize the technical scheme, the reinforcing ribs are reinforcing ribs perpendicular to the panel 1, and the criss-cross reinforcing ribs are perpendicular to each other.
The beneficial effects of adopting above technical scheme are: the structural strength of the reinforcing rib net 2 and the panel 1 is enhanced.
In order to further optimize the technical scheme, the connecting bolts 5 and the connecting nuts are provided with 9 groups in a matched mode, and are respectively and uniformly distributed on the back plate 4 and the reinforcing rib net 2, so that the heat preservation layer 3 and the back plate 4 are uniformly stressed and stably connected.
In order to further optimize the technical scheme, the connecting bolt 5 is a stainless steel bolt, the connecting nut is a stainless steel nut, and corrosion is prevented.
In order to further optimize the technical scheme, the reinforcing rib net 2 and the panel 1 are of an integrated structure, and have strong mechanical properties, and the reinforcing rib net 2, the panel 1 and the back panel 4 are all integrally manufactured by adopting graphene fiber reinforced composite materials through a high-temperature high-pressure and high-pressure process.
In order to further optimize the technical scheme, the weight of the weight increasing layer 3 is selected according to the actual use situation, a weight increasing layer with lighter weight is used for the occasion of the train speed of 200-300KM/h, a weight increasing layer with lighter weight is used for the occasion of the train speed of more than 300KM/h, and the weight of the weight increasing layer 3 is adjusted by adjusting the use amount of concrete when the weight increasing layer 3 is manufactured.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The heat-insulating weight-increasing cover plate for the railway engineering is characterized by comprising a panel, a reinforcing rib net, a heat-insulating layer, a weight-increasing layer and a back plate; wherein, the reinforcing rib net is composed of protruding reinforcing ribs which are fixedly connected to the bottom of the panel and criss-cross; the bottom of the reinforcing rib positioned in the middle of the reinforcing rib net is provided with a mounting groove, a connecting nut is pre-buried at the crossing node of the reinforcing rib positioned in the mounting groove, and the weight-increasing layer and the heat-insulating layer are sequentially positioned in the mounting groove from top to bottom; the back plate, the heat preservation layer and the weight increasing layer are respectively provided with bolt holes corresponding to the connecting nuts, the connecting bolts penetrate through the bolt holes to be in threaded connection with the connecting nuts, and the mounting groove is blocked through the back plate.
2. The heat-insulating and weight-increasing cover plate for railway engineering according to claim 1, wherein one side edge of the panel extends to form a step lap joint public edge, and the other opposite side edge of the panel is recessed inwards to form a step lap joint female edge matched with the step lap joint public edge.
3. The heat-insulating and weight-increasing cover plate for railway engineering according to claim 1, wherein the back plate is designed as a groove with raised periphery, and the opening of the groove faces away from the heat-insulating layer.
4. The heat-insulating and weight-increasing cover plate for railway engineering according to claim 1, wherein grooves corresponding to the raised reinforcing ribs are formed in the weight-increasing layer, so that the weight-increasing layer can be embedded into the reinforcing rib net.
5. The heat-insulating weight-increasing cover plate for railway engineering according to claim 1, wherein the heat-insulating layer is a heat-insulating plate made of polyurethane rigid foam heat-insulating materials.
6. The heat-insulating and weight-increasing cover plate for railway engineering according to claim 1, wherein the weight-increasing layer is made by solidifying concrete.
7. The heat-insulating and weight-increasing cover plate for railway engineering according to claim 1, wherein the reinforcing ribs are reinforcing rib plates perpendicular to the face plates, and the reinforcing rib plates which are crisscrossed are perpendicular to each other.
8. The heat-insulating weight-increasing cover plate for railway engineering according to claim 1, wherein 9 groups of connecting bolts and connecting nuts are arranged in a matched mode and are uniformly distributed on the back plate and the reinforcing rib net respectively.
9. The heat preservation and weight gain cover plate for railway engineering according to claim 8, wherein the connecting bolt is a stainless steel bolt, and the connecting nut is a stainless steel nut.
10. The heat-insulating weight-increasing cover plate for railway engineering according to claim 1, wherein the reinforcing rib net and the panel are of an integrated structure, and the reinforcing rib net, the panel and the back panel are all integrally manufactured by adopting graphene fiber reinforced composite materials through a high-temperature high-pressure die pressing process.
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| CN201910363220.3A CN109950853B (en) | 2019-04-30 | 2019-04-30 | Heat-preserving weight-increasing cover plate for railway engineering |
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| CN209608297U (en) * | 2019-04-30 | 2019-11-08 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of railway construction heat preservation weight gain cover board |
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| KR101277752B1 (en) * | 2011-01-28 | 2013-06-24 | 동국대학교 산학협력단 | Remodelling Construction Method by Inserting External Precast Concrete Wall Panel into the Internal Area of Beam-column Frame of Building and that Precast Concrete Panel |
| CN204491975U (en) * | 2015-03-13 | 2015-07-22 | 河北晶通建筑科技有限公司 | A kind of structure composite wallboard |
| CN206346325U (en) * | 2016-12-28 | 2017-07-21 | 广东涂耐可建筑涂料有限公司 | A kind of building thermal insulation material |
| CN206457993U (en) * | 2017-02-22 | 2017-09-01 | 程雅娴 | A kind of assembly concrete composite wallboard structure |
| CN109162373B (en) * | 2018-10-31 | 2023-12-19 | 山东方正绿色建筑产业有限公司 | Precast concrete sandwich insulation board and preparation method thereof |
| CN109440909B (en) * | 2018-12-25 | 2024-03-01 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Cover plate for railway tunnel and installation method thereof |
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| CN209608297U (en) * | 2019-04-30 | 2019-11-08 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of railway construction heat preservation weight gain cover board |
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