CN109159280B - Ready-to-install high-temperature ablation-resistant prefabricated member for launching station diversion trench and construction method of fire-resistant protective layer - Google Patents
Ready-to-install high-temperature ablation-resistant prefabricated member for launching station diversion trench and construction method of fire-resistant protective layer Download PDFInfo
- Publication number
- CN109159280B CN109159280B CN201810938489.5A CN201810938489A CN109159280B CN 109159280 B CN109159280 B CN 109159280B CN 201810938489 A CN201810938489 A CN 201810938489A CN 109159280 B CN109159280 B CN 109159280B
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- Prior art keywords
- diversion trench
- refractory
- steel bar
- prefabricated member
- reinforcing
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- 238000002679 ablation Methods 0.000 title claims abstract description 35
- 238000010276 construction Methods 0.000 title claims abstract description 21
- 230000009970 fire resistant effect Effects 0.000 title claims description 6
- 239000011241 protective layer Substances 0.000 title abstract description 5
- 238000009271 trench method Methods 0.000 title description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 20
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000011065 in-situ storage Methods 0.000 claims description 17
- 239000010426 asphalt Substances 0.000 claims description 8
- 239000003973 paint Substances 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 4
- 230000010354 integration Effects 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims 5
- 239000010410 layer Substances 0.000 abstract description 29
- 238000005266 casting Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009417 prefabrication Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41F—APPARATUS FOR LAUNCHING PROJECTILES OR MISSILES FROM BARRELS, e.g. CANNONS; LAUNCHERS FOR ROCKETS OR TORPEDOES; HARPOON GUNS
- F41F3/00—Rocket or torpedo launchers
- F41F3/04—Rocket or torpedo launchers for rockets
Abstract
The invention discloses a ready-to-assemble high-temperature ablation-resistant prefabricated member for a diversion trench of a transmitting station and a construction method of a fireproof protective layer. The prefabricated part comprises a high-temperature ablation resistant main body (1) prepared from refractory castable, wherein the main body is provided with a vacancy structure (2) and an upper layer of steel bar mesh (3) and a lower layer of steel bar mesh; the reinforcing mesh (3) consists of crisscrossed reinforcing bars which are embedded in the refractory castable and extend out of the refractory castable; the vacancy structure (2) is positioned between the upper layer of reinforcing steel bar mesh (3) and the lower layer of reinforcing steel bar mesh and consists of a groove (4) formed by vacancies in refractory castable. And arranging a prefabricated part at a certain position in the diversion trench, and casting a refractory castable around the prefabricated part to complete the structurally integrated refractory protection layer. The prefabricated member has the advantages of strong maintainability, strong environmental adaptability, long service life and the like in the construction of the diversion trench.
Description
Technical Field
The invention belongs to the technical field of civil construction, in particular to a rocket launching station diversion trench construction technology, and particularly relates to an instant high-temperature ablation resistant prefabricated member for a launching station diversion trench and a refractory protection layer construction method.
Technical Field
The main function of the launching station diversion trench is to discharge the high-temperature high-flow velocity tail flame generated by the ignition of the booster during rocket launching according to the design direction, thereby ensuring the normal work of the rocket engine and eliminating the damage to surrounding facilities. At present, most of the main structures of the diversion trenches are reinforced concrete, and the working layer is a cast-in-situ refractory reinforced concrete protective layer for resisting high-temperature thermal shock during rocket launching.
The transmitting station diversion trench is formed by casting on site all the time, and most of the used materials are high-aluminum castable and are put into use after being naturally cured after casting. This structure has better integrity but suffers from a number of problems in use, mainly including:
the maintainability is poor: the cast-in-situ integrated structure with the reinforcing mesh is adopted by the diversion trench of the transmitting station, so that the damage speed difference of all parts is very large in use, for example, the direct current section, particularly the direct current spraying area, is flushed by high-temperature strong air flow, the damage speed is maximum, and the flat current section is basically not damaged due to the structural protective design, so that the local parts with serious damage are necessary to be maintained after being used for a plurality of times. The existing integral cast-in-situ structure has good integrity, but cannot be removed and maintained locally.
Poor environmental adaptability: the construction environment of the refractory castable belongs to the open air environment, and the construction performance and technical indexes of the castable are greatly influenced by environmental factors such as temperature, humidity and the like, and although the construction performance of the castable can be corrected by the technology of adding additives, the construction performance of the castable is difficult to reach the technical indexes in the standard detection environment, so that the service performance of the castable cannot be ensured to the maximum extent.
The high temperature ablation resistance is poor: in-situ cast materials are generally not baked to obtain high strength and the cement addition is sufficiently increased, and too high a cement addition significantly reduces the refractoriness of the material, resulting in deterioration of the high temperature performance thereof. Compared with the baked refractory castable, the refractory castable which is not baked has lower bonding strength and poorer anti-scouring performance. In addition, when the direct current section is impacted by high-temperature air current, crystal water in cast-in-situ refractory concrete is gasified rapidly, so that the material bursts easily to damage the structure, the structure is damaged abnormally, and the service life does not meet the requirements.
Disclosure of Invention
The invention aims at providing a construction method of a ready-to-install high-temperature-ablation-resistant prefabricated member structure and a refractory protection layer of a diversion trench aiming at a part with larger damage speed of a diversion trench of an emission station, and the construction method is used for discarding the integral cast-in-situ structure of an original internally-arranged reinforcing steel bar net and adopting a way of combining the ready-to-install high-temperature-ablation-resistant prefabricated member with cast-in-situ, namely: the position with harsh use condition adopts a ready-to-assemble high temperature resistant ablation prefabricated member, and the structure integration is completed around the prefabricated member by adopting a cast-in-situ mode. Comprehensively considering the use environment and the requirements of the harsh parts of the diversion trench of the transmitting station, the adopted technical scheme is as follows from two aspects of structure and process:
the ready-to-install high-temperature ablation-resistant prefabricated member for the diversion trench of the launching station comprises a high-temperature ablation-resistant main body prepared from refractory castable, wherein the high-temperature ablation-resistant main body is provided with a vacancy structure and an upper layer of steel bar mesh and a lower layer of steel bar mesh; the steel bar net consists of crisscrossed steel bar rods which are embedded in the refractory castable and extend out of the refractory castable; the vacancy structure is positioned between the upper layer of reinforcing steel bar mesh and the lower layer of reinforcing steel bar mesh, and the vacancy structure is formed by regular grooves formed by vacancies in refractory castable.
Further, the void structure includes an upper layer of grooves and a lower layer of grooves.
Further, the cross section of the groove is trapezoid or triangle, and the edge of the cross section of the vacancy structure is continuous wave-folded line shape.
Further, the cross section of the groove is rectangular, and a T-shaped anchoring structure is arranged between the upper layer of groove and the lower layer of groove.
Further, the distance between the upper layer of reinforcing steel bar mesh and the lower layer of reinforcing steel bar mesh is 150mm, each reinforcing steel bar rod protrudes out of the side surface of the high-temperature ablation resistant main body by 150mm, and the diameter of each reinforcing steel bar rod is 12mm.
Further, the surface of the reinforcing bar is coated with asphalt paint, and the thickness of the asphalt paint is 0.5mm.
The construction method of the fire-resistant protection layer of the diversion trench of the launching station is characterized in that the prefabricated member is arranged at a certain position in the diversion trench, the fire-resistant castable is cast around the prefabricated member in a cast-in-place mode, the reinforcing steel mesh 3 of the prefabricated member is in butt joint with reinforcing steel bars of the diversion trench matrix around the prefabricated member, and the vacancy structure 2 in the prefabricated member is riveted and combined with the cast-in-place fire-resistant castable to complete the structural integration of the diversion trench.
Furthermore, the prefabricated member adopts a mode of pouring and prefabricating in a factory, and the concrete preparation method comprises the following steps: 1) manufacturing a mould according to a drawing, 2) arranging a reinforcing mesh in the mould, embedding a riveting structure corresponding to the required vacancy structure shape, 3) preparing refractory castable according to a technical scheme, 4) pouring, maintaining at a controlled temperature and baking, and simultaneously preparing a sample on line for detecting and judging technical indexes.
The invention has the beneficial effects that:
the ready-to-install high-temperature ablation resistant prefabricated member structure provided by the invention can be used for parts with larger damage speed, such as a direct spraying area in a launching station diversion trench, and then is combined with surrounding reinforcing steel bar meshes to cast in situ to form an integral fireproof protective layer, and has the following advantages:
1) The maintainability is strong: because the mounting position of the ready-to-install high temperature ablation resistant prefabricated member structure is definite and the prefabricated member structure is a whole, the prefabricated member can be locally removed and maintained after the service life is reached, and the structure and the strength of other parts are not damaged.
2) The environmental adaptability is strong: because the prefabricated member is prepared in a professional refractory material factory environment, the temperature and humidity in the prefabrication process are controllable, and the performance index of the refractory castable can be tested through the inspection in the production process so as to judge whether the refractory castable is qualified or not.
3) The service life is long: compared with the integral cast-in-situ process, the factory prefabrication is added with the baking process, so that the strength of the material is greatly improved, the excellent high-temperature ablation resistance is realized, and the service life is greatly prolonged.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional structure of a ready-to-install high temperature ablation resistant preform;
FIG. 2 is a top view of a ready-to-install refractory ablation preform;
FIG. 3 is a side view of a ready-to-install refractory ablation preform (example 1);
FIG. 4 is a front view of a ready-to-package refractory ablation preform (example 1);
FIG. 5 is a cross-sectional view of a ready-to-install refractory ablation preform (A-A, example 1);
FIG. 6 is a side view of a ready-to-package refractory ablation preform (example 2);
FIG. 7 is a front view of a ready-to-package refractory ablation preform (example 2);
FIG. 8 is a cross-sectional view of a ready-to-install refractory ablation preform (A-A, example 2).
Description of the drawings:
1. a high temperature ablation resistant body prepared from refractory castable; 2. a vacancy structure; 3. a reinforcing mesh; 4. a groove; 5. t-shaped anchoring structure.
Detailed Description
Example 1
As shown in fig. 1-5, an instant high temperature ablation resistant prefabricated member for a diversion trench of an emission station comprises a high temperature ablation resistant main body 1 prepared from refractory castable, wherein the high temperature ablation resistant main body is provided with a vacancy structure 2 and an upper layer of steel bar mesh 3 and a lower layer of steel bar mesh 3; the steel bar net 3 consists of steel bar rods which are embedded in the refractory castable and extend out of the refractory castable and are crisscrossed vertically and horizontally; the vacancy structure 2 is positioned between the upper layer of steel bar mesh 3 and the lower layer of steel bar mesh 3, and the vacancy structure 2 is composed of regular grooves 4 formed by vacancies in refractory castable. The vacancy structure 2 comprises an upper layer of grooves 4 and a lower layer of grooves 4, the cross section of each groove 4 is trapezoid or triangle, and the edge of the cross section of the vacancy structure 2 is continuous corrugated.
The distance between the upper layer of reinforcing mesh 3 and the lower layer of reinforcing mesh 3 is 150mm, each reinforcing bar protrudes out of the side surface of the high-temperature ablation resistant main body 1 by 150mm, and the diameter of each reinforcing bar is 12mm. And the surface of the reinforcing bar is coated with asphalt paint, and the thickness of the asphalt paint is 0.5mm.
Example 2
This example is identical to example 1 except that the change is made at the void structure.
As shown in fig. 6-8, the cross section of the groove 4 is rectangular, and a T-shaped anchoring structure is arranged between the upper and lower layers of grooves.
Example 3
The prefabricated member in the embodiment 1 or 2 is set in certain position in the diversion trench, the fireproof casting material is cast in situ around the prefabricated member, the reinforcing steel net 3 of the prefabricated member is butt jointed with the reinforcing steel bars of the diversion trench matrix around the prefabricated member, and the vacancy structure 2 in the prefabricated member is riveted and combined with the cast-in-situ fireproof casting material to complete the diversion trench structure integration.
The prefabricated member adopts a mode of pouring and prefabricating in a factory, and the concrete preparation method comprises the following steps: 1) manufacturing a mould according to a drawing, 2) arranging a reinforcing mesh in the mould, embedding a riveting structure corresponding to the required vacancy structure shape, 3) preparing refractory castable according to a technical scheme, 4) pouring, maintaining at a controlled temperature and baking, and simultaneously preparing a sample on line for detecting and judging technical indexes.
The prefabricated member is applied to a direct spraying area of a diversion trench of a certain transmitting station, the damaged thickness is lower than 2mm after being subjected to one-time high-temperature high-speed air flow spraying, and is far lower than 16mm of the cast-in-situ refractory castable, the damage rate is reduced by about 87.5%, and the expected service life is prolonged by several times.
Unlike integral cast-in-situ refractory castable, the refractory castable in the prefabricated member structure adopts a factory casting prefabrication mode, and a temperature and humidity controllable curing and baking process is added. The construction process is changed, so that the material performance is greatly improved, for example, the refractoriness can be improved by more than 100 ℃, the compressive strength can be improved by 70% -100%, the ablation rate is reduced by 30%, the better high-temperature ablation resistance is shown, and the service life is greatly prolonged.
The prefabricated member is provided with the vacancy part, and the function of the prefabricated member is to improve the integrity of the prefabricated member and surrounding cast-in-situ refractory concrete, so that on one hand, a corrugated line structure or a clamping groove structure can be adopted to increase the bonding area, and on the other hand, an irregular bonding surface is designed, so that the prefabricated member is beneficial to releasing the thermal stress generated when the material is heated and the temperature rises in multiple directions.
The reinforcing mesh is to further improve the structural integrity of the refractory layer: the surface of the steel bar is coated with asphalt paint with the thickness of 0.5mm, and the asphalt paint is used for buffering the thermal expansion difference between the steel bar and the refractory material; the reinforcing mesh must be arranged according to the arrangement mode of the reinforcing bars for the cast-in-place concrete at the joint and the specific butt joint position.
Claims (6)
1. A fire-resistant protection layer construction method for a diversion trench of an emission station is characterized by comprising the following steps: arranging a prefabricated member for the diversion trench of the emission station for the high-temperature ablation resistance in a certain position of the diversion trench, and carrying out cast-in-situ refractory castable around the prefabricated member, wherein a reinforcing steel mesh (3) of the prefabricated member is in butt joint with reinforcing steel bars of a diversion trench matrix around the prefabricated member, and a vacancy structure (2) in the prefabricated member is riveted and combined with the cast-in-situ refractory castable to complete the structural integration of the diversion trench;
the prefabricated part comprises a high-temperature ablation resistant main body (1) prepared from refractory castable, wherein the high-temperature ablation resistant main body (1) is provided with a vacancy structure (2) and an upper layer of reinforcing steel bar mesh (3) and a lower layer of reinforcing steel bar mesh; the steel bar net (3) consists of steel bar rods which are embedded in the refractory castable and extend out of the refractory castable and are crisscrossed vertically and horizontally; the vacancy structure (2) is positioned between the upper layer of reinforcing steel bar mesh (3) and the lower layer of reinforcing steel bar mesh, and the vacancy structure (2) is formed by grooves (4) formed by vacancies in refractory castable.
2. The firing station diversion trench refractory protection layer construction method according to claim 1, wherein: the void structure (2) comprises an upper and a lower layer of grooves (4).
3. The firing station diversion trench refractory protection layer construction method according to claim 1, wherein: the cross section of the groove (4) is trapezoid or triangle, and the edge of the cross section of the vacancy structure (2) is continuous wave-folded line shape.
4. The firing station diversion trench refractory protection layer construction method according to claim 1, wherein: the cross section of the groove (4) is rectangular, and a T-shaped anchoring structure (5) is arranged between the upper layer of groove and the lower layer of groove.
5. The firing station diversion trench refractory protection layer construction method according to claim 1, wherein: the distance between the upper layer of reinforcing mesh (3) and the lower layer of reinforcing mesh (3) is 150mm, each reinforcing bar protrudes out of the side surface of the high-temperature ablation resistant main body (1) by 150mm, and the diameter of each reinforcing bar is 12mm.
6. The firing station diversion trench refractory protection layer construction method according to claim 1, wherein: and the surface of the reinforcing bar is coated with asphalt paint, and the thickness of the asphalt paint is 0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810938489.5A CN109159280B (en) | 2018-08-17 | 2018-08-17 | Ready-to-install high-temperature ablation-resistant prefabricated member for launching station diversion trench and construction method of fire-resistant protective layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810938489.5A CN109159280B (en) | 2018-08-17 | 2018-08-17 | Ready-to-install high-temperature ablation-resistant prefabricated member for launching station diversion trench and construction method of fire-resistant protective layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109159280A CN109159280A (en) | 2019-01-08 |
| CN109159280B true CN109159280B (en) | 2023-12-05 |
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| CN201810938489.5A Active CN109159280B (en) | 2018-08-17 | 2018-08-17 | Ready-to-install high-temperature ablation-resistant prefabricated member for launching station diversion trench and construction method of fire-resistant protective layer |
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| CN102477778B (en) * | 2010-11-25 | 2014-07-09 | 欧文斯科宁知识产权资产有限公司 | Prefabricated heat-retaining composite plate and assembly, prefabricating method and mould profile thereof as well as template and concrete slab comprising composite plate |
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| CN109159280A (en) | 2019-01-08 |
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