CN108930332B - Construction method for fire-resistant concrete protective layer on top of direct-current section of W-shaped diversion trench at launching station - Google Patents

Construction method for fire-resistant concrete protective layer on top of direct-current section of W-shaped diversion trench at launching station Download PDF

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Publication number
CN108930332B
CN108930332B CN201810938591.5A CN201810938591A CN108930332B CN 108930332 B CN108930332 B CN 108930332B CN 201810938591 A CN201810938591 A CN 201810938591A CN 108930332 B CN108930332 B CN 108930332B
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current section
concrete
protective layer
template
direct
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CN108930332A (en
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李博平
邓智平
王坤
王兆肖
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No63926 Unit Of Pla
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No63926 Unit Of Pla
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/16Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

The invention discloses a construction method of a refractory concrete protective layer at the top of a direct-current section of a W-shaped diversion trench at a launching station, which combines formwork pouring and scraper scraping, and comprises the following steps: and (3) supporting a mold for two times at the arc top part, pouring to the maximum elevation, and then finishing the surface molding by using a specially-made arc scraper. The method can save the manufacturing and the erection of the top arc-shaped template, simplify the construction process and shorten the construction time; and do not have the restriction of top arc template, can make full use of equipment of vibrating such as vibrating rod vibrate the concrete mixture, make the concrete more closely knit, improve and pour the quality.

Description

Construction method for fire-resistant concrete protective layer on top of direct-current section of W-shaped diversion trench at launching station
Technical Field
The invention belongs to the technical field of civil engineering construction, particularly relates to a construction method of a diversion trench at a launching station, and particularly relates to a cast-in-place construction method of a refractory concrete protective layer at the top of a W-shaped diversion trench impact area.
Technical Field
The main function of the launching station diversion trench is to discharge high-temperature and high-flow-rate tail flame generated by the ignition of the booster during the launching of the rocket out of the tower or the tunnel according to the design direction, so as to prevent gas from backfiring or rushing to the ground facility, thereby ensuring the normal work of the rocket engine and eliminating the damage of the rocket engine to the surrounding facilities. The main structure of the current diversion trench is mostly reinforced concrete, and the working layer is a cast-in-place fire-resistant reinforced concrete protective layer for resisting high-temperature thermal shock during rocket launching. The launching station diversion trench is molded by on-site casting all the time, the used materials are mostly high-aluminum series casting materials, and the casting materials are put into use after being naturally cured after the casting is finished.
The W-shaped diversion trench is a diversion trench type adopted by an underground launching station, and the fireproof protective layer of the structure has better integrity by adopting a cast-in-place construction process. The direct current section is approximate to the joint part of two cylindrical surfaces, the lower part of each side of the direct current section is a cylindrical surface, the part close to the top is a plane, and the top is an arc surface, as shown in figure 1, the dotted line in the figure is a control line on the surface of the refractory concrete protective layer. The direct current section, especially the top direct injection area, is washed by high-temperature strong airflow, and the quality of the construction quality of the direct current section has important influence on the service performance and the service life of the diversion trench.
When the W-shaped diversion trench direct-current section circular arc top is cast in place, the W-shaped diversion trench direct-current section circular arc top is usually the last construction part of the direct-current section, the traditional formwork erecting and pouring process is complex, a formwork is not easy to erect, the concrete vibrating difficulty is high, the construction quality is influenced, and the phenomenon that the service life is shortened due to too fast ablation in the launching and using process is easily caused. A new construction method needs to be explored, the construction process is simplified while the top design radian and the concrete pouring quality are ensured, and the construction period is shortened.
Disclosure of Invention
The invention aims to provide a construction method combining formwork pouring and scraper scraping aiming at the construction of a fire-resistant concrete protective layer at the circular arc top of a direct-current section of a W-shaped diversion trench at a launching station. The purpose of the invention is realized by the following technical scheme:
the invention abandons the construction method that the top of the direct current section of the original diversion trench is completely poured by a supporting die, and adopts the construction process of combining the supporting die pouring and the scraping of the scraper blade for construction, namely: and (3) supporting a mold for two times at the arc top part, pouring to the maximum elevation, and then finishing the surface molding by using a specially-made arc scraper.
The construction method comprises the following specific construction steps:
1) erecting a straight template, wherein the top surface of the template is lower than the designed elevation of a refractory concrete protective layer at the top of the direct current section;
2) pouring refractory concrete to the top surface of the straight template, and performing primary pouring;
3) after the primary pouring surface is poured, 1-2 layers of rectangular wood are additionally arranged on the top surface of the straight template, so that the purpose of increasing the height of the template is achieved, and the top surface of the rectangular wood is higher than the designed elevation of a refractory concrete protective layer at the top of the direct-current section;
4) continuously pouring concrete to the top surface of the rectangular wood until the concrete surface is higher than the highest control point on the side wall to form a secondary pouring surface;
5) removing the added rectangular wood when the concrete is initially set;
6) manufacturing a scraper according to the design radian of a fireproof concrete protection layer at the top of the direct-current section, and cutting off the excess concrete at the top of the direct-current section along the top surface of the straight template by using the cambered surface of the scraper;
7) and after the cutting is finished, troweling the surface to obtain the arc-shaped top of the formed refractory concrete protective layer at the top of the direct current section.
Further, when the straight template is erected in the step 1), the top surface of the template is lower than the designed elevation of the refractory concrete protective layer at the top of the direct current section by 90-110 mm.
Further, after the rectangular wood is arranged in the step 3), the top surface of the rectangular wood is 10-50 mm higher than the designed elevation of the refractory concrete protective layer at the top of the direct current section.
The invention has the beneficial effects that:
the construction process combining formwork pouring and scraper scraping can be used for the construction of a fire-resistant concrete protective layer at the circular arc top of the direct-current section of the W-shaped diversion trench at the launching station, and has the following advantages:
1) the process is simple: as the manufacture and the erection of the top arc-shaped template are omitted, the construction process is greatly simplified, and the construction time is shortened.
2) The pouring quality is reliable: there is not the restriction of top arc template, can make full use of equipment of vibrating such as vibrating rod vibrate the concrete mixture, make the concrete more closely knit, improved and pour the quality.
Drawings
FIG. 1 is a schematic side projection view of a W-shaped guiding gutter;
FIG. 2 is a schematic view of the construction method (a-straight formwork erection);
FIG. 3 is a schematic view of the construction method steps (b-one concrete pour);
FIG. 4 is a schematic view of the construction method steps (c-setting rectangular lumber);
FIG. 5 is a schematic representation of the construction method steps (d-secondary concrete placement);
FIG. 6 is a schematic view of the construction method steps (e-initial setting of concrete);
FIG. 7 is a schematic view of the construction method steps (f-screed construction);
FIG. 8 is a schematic drawing of the construction process steps (g-top molding).
Reference numerals:
1. a direct current section; 2. a control line; 2-1, control point; 3. a straight template; 4. primary casting surface; 5. rectangular wood; 6. secondary pouring surface; 7. initial setting surface of concrete; 8. a portion to be cut; 9. a squeegee; 10. the arc-shaped fireproof concrete protective layer is arranged at the top of the direct current section.
Detailed Description
FIGS. 2 to 8 show the working process of the construction method of the refractory concrete protective layer on the top of the straight flow section of the W-shaped diversion trench at the launching station,
the method comprises the following specific steps:
1) as shown in fig. 2, a straight formwork 3 is erected, and the top surface of the formwork is lower than the designed elevation of the refractory concrete protective layer at the top of the direct current section 1.
2) As shown in fig. 3, refractory concrete is poured on the top surface of the straight formwork 3, and one pouring is performed.
3) As shown in fig. 4, after the primary pouring surface 4 is poured, one to two layers of rectangular wood 5 are additionally arranged on the top surface of the straight template 3, so that the purpose of increasing the height of the template is achieved, and the top surface of the rectangular wood 5 is slightly higher than the designed elevation of the refractory concrete protective layer on the top of the direct current section 1.
4) As shown in fig. 5, concrete is continuously poured to the top surface of the rectangular timber 5, the design elevation of the refractory concrete protective layer at the top of the direct current section 1 is marked on the concrete base surface of the side wall through the control line 2 and the control point 2-1 before, that is, the concrete surface at the moment is higher than the highest control point on the side wall, and a secondary pouring surface 6 is formed.
5) As shown in fig. 6, when the concrete is initially set, the added rectangular wood 5, i.e. the initial setting surface 7 of the concrete, is removed, the initial setting time is grasped, and the concrete cannot be obviously collapsed and deformed when the rectangular wood is removed, and has plasticity;
6) as shown in fig. 7, the scraper is made according to the designed radian of the refractory concrete protective layer at the top of the direct current section 1, and the excess concrete at the initial setting surface of the concrete at the top of the direct current section is cut off along the top surface of the straight template by using the cambered surface of the scraper.
7) After the cut-out is complete, the surface is smoothed with a trowel to obtain a shaped arcuate top, as shown in fig. 8.
In the present embodiment, there are the following points:
A. and marking a control line for designing the height of the refractory concrete protective layer of the direct-current section on the side wall, particularly marking the top height of the direct-current section.
B. And (3) processing and manufacturing a scraper, wherein the diameter of the cambered surface of the scraper is 460mm, and the maximum height of the cambered part is 150 mm.
C. And erecting a straight template, wherein the top surface of the template is lower than the designed elevation of the top of the direct current section by about 100 mm.
D. And conveying the refractory concrete mixture to the position near the direct current section, pouring concrete into the straight template, vibrating to be compact, and pouring the refractory concrete to the top surface of the straight template.
E. Clear up the concrete mixture of straight template top adhesion, then add respectively at top both sides and establish the rectangular wood, the rectangular wood is connected fixedly with straight template top surface or between the upper and lower layer rectangular wood with the iron nail, makes the rectangular wood top surface be higher than direct current section top design elevation 10~50 mm.

Claims (2)

1. The utility model provides a launch station "W" type guiding gutter direct current section top refractory concrete inoxidizing coating construction method, the direct current section is located "W" type guiding gutter middle part, designs refractory concrete inoxidizing coating elevation before the construction to draw control line and control point on side wall concrete base face according to design elevation, its characterized in that: the construction method comprises the following specific construction steps:
1) erecting a straight template, wherein the top surface of the template is lower than the designed elevation of a refractory concrete protective layer at the top of the direct current section;
2) pouring refractory concrete to the top surface of the straight template, and performing primary pouring;
3) after the primary pouring surface is poured, 1-2 layers of rectangular wood are additionally arranged on the top surface of the straight template, so that the purpose of increasing the height of the template is achieved, and the top surface of the rectangular wood is higher than the designed elevation of a refractory concrete protective layer at the top of the direct-current section; after the middle-long square timber is arranged, the top surface of the long square timber is 10-50 mm higher than the designed elevation of the refractory concrete protective layer at the top of the direct current section;
4) continuously pouring concrete to the top surface of the rectangular wood until the concrete surface is higher than the highest control point on the side wall to form a secondary pouring surface;
5) removing the added rectangular wood when the concrete is initially set;
6) manufacturing a scraper according to the design radian of a fireproof concrete protection layer at the top of the direct-current section, and cutting off the excess concrete at the top of the direct-current section along the top surface of the straight template by using the cambered surface of the scraper;
7) and after the cutting is finished, troweling the surface to obtain the arc-shaped top of the formed refractory concrete protective layer at the top of the direct current section.
2. The construction method according to claim 1, characterized in that: when the straight template is erected in the step 1), the top surface of the template is lower than the designed elevation of the refractory concrete protective layer at the top of the direct current section by 90-110 mm.
CN201810938591.5A 2018-08-17 2018-08-17 Construction method for fire-resistant concrete protective layer on top of direct-current section of W-shaped diversion trench at launching station Expired - Fee Related CN108930332B (en)

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CN111562189B (en) * 2020-05-31 2022-06-28 太原理工大学 Ultrahigh-temperature gas jet erosion test device for diversion trench material

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RU2299411C1 (en) * 2005-12-23 2007-05-20 Федеральное Государственное унитарное предприятие "Государственное научно-производственное предприятие "Сплав" Test bed for simulation of missile jamming in launching tube
CN101475381A (en) * 2008-01-04 2009-07-08 郑州登峰熔料有限公司 Diversion trench high-strength low ablation rate castable concrete for launching rocket

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