WO2013062244A1 - Method for constructing a bobsleigh course using a high-performance wet-type shotcrete composition - Google Patents

Method for constructing a bobsleigh course using a high-performance wet-type shotcrete composition Download PDF

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Publication number
WO2013062244A1
WO2013062244A1 PCT/KR2012/007787 KR2012007787W WO2013062244A1 WO 2013062244 A1 WO2013062244 A1 WO 2013062244A1 KR 2012007787 W KR2012007787 W KR 2012007787W WO 2013062244 A1 WO2013062244 A1 WO 2013062244A1
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Prior art keywords
shotcrete
wet
weight
composition
shotcrete composition
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PCT/KR2012/007787
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French (fr)
Korean (ko)
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윤경구
김용곤
최성용
김성권
신현길
Original Assignee
강원대학교산학협력단
대상이앤씨 주식회사
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Priority to CN201280053092.9A priority Critical patent/CN103906552B/en
Publication of WO2013062244A1 publication Critical patent/WO2013062244A1/en

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04—Lining with building materials
    • E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
    • A63B71/02—Games or sports accessories not covered in groups A63B1/00 - A63B69/00 for large-room or outdoor sporting games
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C19/00—Design or layout of playing courts, rinks, bowling greens or areas for water-skiing; Covers therefor
    • A63C19/10—Ice-skating or roller-skating rinks; Slopes or trails for skiing, ski-jumping or tobogganing

Definitions

  • the present invention is a construction method of the bobsled stadium using a high performance wet shotcrete composition, more specifically, by using a high performance wet shotcrete composition containing silica fume and AE agent prior to pouring excessive pumping performance (pumpability) is increased and poured
  • the present invention relates to a method for constructing a bobsled arena through a high performance wet shotcrete composition having high workability, high strength, and high durability, such as a decrease in air volume and an increase in shotability.
  • Wet shotcrete is a concept that is distinguished from dry shotcrete. It refers to concrete that adds water to the injector when water is mixed and supplies it to the sprayer by increasing the spraying speed by applying air from the nozzle. Air pressure type, screw and piston pump It is roughly classified as a press method. 1 is a block diagram showing the production process and construction method of the conventional wet shotcrete.
  • Wet shotcrete has the advantage of easy quality control and less rebound and dust generation than dry shotcrete because it sprays the pre-mixed material at a constant mixing ratio.
  • construction volume is larger than dry shotcrete, which is suitable for mass construction.
  • the equipment is large and constrained by the materials used, and the transfer distance is shorter than dry shotcrete.
  • Shotcrete used in Korea is mainly used for slope stabilization of tunnels and underground spaces as a primary support material, and is used only for suppressing initial deformation and is not used as a main structural material. It is also used for the maintenance of all structures.
  • the second point is about poor quality control.
  • the shotcrete used in Korea is 21MPa, which is the quality standard, and the quality is low. Therefore, the shotcrete used in Korea currently serves only as the primary support material, and the concrete (tunnel: lining) can be overlaid to secure long-term strength and durability. As a result, the initial construction is mainly designed to prevent deformation, and thus, the efforts and recognition for the high performance of shotcrete are insufficient.
  • high performance concrete is defined as high strength and high durability of concrete, but in case of wet shotcrete, high workability should be added to high performance. Accordingly, in recent years, studies on high strength and high durability as well as high workability (pumping performance, rebound rate, pasting performance) have been actively conducted at home and abroad for the purpose of improving the performance of wet shotcrete.
  • Wet shotcrete consists of a process of transferring material through a hose by a pump and a process of spraying it onto an object (object structure) .At this time, the material transfers well due to the characteristics of the material and ensures high yield stress and viscosity that does not flow down during shotcrete placement. shall. In other words, it is necessary to have a material with excellent sticking performance when pouring shotcrete while securing fluidity with excellent pumping performance.
  • the track of the bobsled stadium composed of the change curve is a representative structure that is difficult to construct the panel formwork, and requires the resistance of the sea and watertightness.
  • the present invention has been proposed to solve the above-mentioned conventional problems
  • the object of the present invention is that the present invention has been proposed to solve the above-mentioned conventional problems
  • the object of the present invention is that of shotcrete It is to provide a construction method of the bobsled stadium through the high performance wet shotcrete composition with improved construction properties, and does not easily deteriorate and cracks for a long time compared to the existing concrete, and has enhanced compressive strength.
  • Still another object of the present invention is to provide a construction method of a bobsled arena, which can improve performance by preventing safety accidents during a game through a high performance wet shotcrete composition capable of preventing damage caused by freezing and impact.
  • the construction method of the bobsled arena using the high performance wet shotcrete composition of the present invention is fixed to the support to support the curved side of the wire mesh form formed perforations, a plurality of cooling pipes on the curved side, the bottom and the front end of the wire mesh formwork Arranged in the longitudinal direction, in order to enhance the adhesion and binding force of the wet shotcrete composition, the reinforcing bar is disposed in a lattice so as to cover the cooling pipe, and the curved maintenance pipe for maintaining a curve on the upper surface of the rebar is fixed Forming step to install spaced apart at intervals, manufacturing a wet shotcrete composition, the shotcrete step of laying the wet shotcrete composition on the curved side and the bottom of the wire mesh formwork, using a screed tool to perform a curved cotton wool
  • Finishing step comprising a wet curing step of wet curing by spraying on the surface of the roughly curved surface and the bottom portion, the wet shotcrete composition, 80 ⁇ 85% by volume of shotcrete and 15 to 20% by volume of air % Is blended, the shotcrete before the formulation is based on 100% by weight of shotcrete before mixing 18 ⁇ 28% by weight of coarse aggregate, 40 ⁇ 50% by weight of aggregate, 12 ⁇ 22% by weight of cement, 3 ⁇ 13% by weight of water , 1.4 to 2.4 wt% silica fume, 1.6 to 2.6 wt% expander, 0.01 to 0.1 wt% high-performance fluidizing agent comprises 0.0001 to 0.01 wt% of AE agent, the AE agent is 0.0 to 100 parts by weight of the cement 027 to 0.005 parts by weight.
  • the present invention has the effect of increasing the construction properties of the shotcrete and bobsled stadium through the high-performance wet shotcrete composition with high compressive strength that does not easily deteriorate and cracks for a long time compared to conventional concrete.
  • silica fume, an expansion material and AE agent are included to provide a high performance wet shotcrete composition with high strength and high durability, which has excellent pumping performance, reduces rebound during pouring, improves sticking performance after placing shotcrete, and does not cause shrinkage cracking during the hydration reaction.
  • a high performance wet shotcrete composition with high strength and high durability which has excellent pumping performance, reduces rebound during pouring, improves sticking performance after placing shotcrete, and does not cause shrinkage cracking during the hydration reaction.
  • FIG. 2 is a partial cutaway perspective view of a bobsled stadium according to the present invention.
  • FIG. 3 is a sectional view of a bobsled stadium according to the present invention.
  • Figure 4 is a cross-sectional view showing a state of the mold manufacturing step according to the present invention.
  • FIG. 5 is a cross-sectional view showing a state of the shotcrete installation step according to the present invention.
  • Figure 6 is a cross-sectional view showing a state of the first surface finishing step according to the present invention.
  • Figure 7 is a cross-sectional view showing the state of the second surface finishing step and the wet curing step according to the present invention.
  • Figure 1 is a flow chart of the bobsled stadium construction method of the present invention
  • Figures 2 and 3 are partial cutaway perspective view and cross-sectional view showing the bobsled stadium construction completed in accordance with the present invention.
  • the construction method of the bobsled stadium using the high-performance wet shotcrete composition of the present invention includes a mold fabrication step, a shotcrete laying step, a first surface finishing step, a second surface finishing step, and a wet curing step.
  • Figure 4 is a cross-sectional view showing a state of the mold manufacturing step according to the present invention.
  • the mold 270 manufacturing step for manufacturing the track 200 of the bobsled stadium is fixed to the wire formwork (Stay Form) 272, the cooling pipe 274 is disposed, the reinforcing bars 276 to the adhesiveness And strengthening the binding force, and is divided into the step of installing the curve maintaining pipe (278).
  • Fixing the wire mesh formwork 272 is fixed to the support 100 so that the mesh mesh member 270 is attached to the rebars formed in the longitudinal and horizontal direction so that the wire mesh formwork 270 having the wire mesh is curved to support the curved side portion 240.
  • the wire mesh formwork 272 should maintain a curved shape when the equipment for installing the wet shotcrete composition is poured at a high pressure, and the material should be easy to manufacture. In addition, between the wire mesh of the wire mesh formwork 272 to maintain a gap in which the wet shotcrete composition can be stagnant, and after installation, the wire mesh formwork 272 is integrated with the wet shotcrete composition.
  • Arranging the cooling pipe 274 is a plurality of cooling pipes 274 on the curved side portion 220, the bottom portion 240 and the tip portion 260 of the wire mesh formwork 272 in the longitudinal direction of the track 200 of the bobsled stadium To place.
  • Enhancing the adhesion and binding force is to arrange and secure the reinforcing bar 276 in a lattice so that the cooling pipe 274 is covered in order to enhance the adhesion and binding force of the wet shotcrete composition.
  • Wire meshes may be used instead of the reinforcing bars, or steel bars and wire meshes may be used together.
  • Installing the curved maintenance pipe (normative frame) 278 installs the curved maintenance pipe 278 spaced at regular intervals to maintain the curve on the upper surface of the rebar 276.
  • the curve maintaining pipe 278 is a device for constructing the change curve inside the bobsled stadium track 200 should be easy to assemble the curve processing, and also should not be deformed by the high pressure of the equipment to install the wet shotcrete composition, It should be easy to remove the curved surface after the first surface finishing step to be described later.
  • FIG. 5 is a cross-sectional view showing a state of the shotcrete laying step according to the present invention.
  • the wet shotcrete composition is installed by attaching the wet shotcrete composition to the bottom portion, the curved side portion, and the front end portion, and then, when the wet shotcrete composition is laid, the foreign substance generated by the rebounding is removed.
  • the shotcrete is poured in the order of the curved side and the tip portion after the bottom casting, and in the case of the casting joint (construction joint), the foreign material that is rebound must be removed and then poured.
  • the nozzle When pouring, the nozzle should always be kept perpendicular to the spraying surface, maintain the proper spraying distance and spraying pressure, and spray the sprayed to the desired thickness within the range that the installed wet shotcrete composition will not flow down. You need to spray it repeatedly.
  • the surface with the rebar 276 should be kept to a minimum coating thickness of at least 25 mm, and when carried out where the cooling pipe 274 and the reinforcing bar 276 are installed, they should be sprayed so as not to form voids between the respective components, If the temperature is below 5 ° C, no laying should be done.
  • the laid wet shotcrete composition penetrates the curved side portion 220, the bottom portion 240, and the tip portion 260 of the wire mesh formwork 272 to the rear of the wire mesh formwork 272 to be integrated with the wire mesh formwork 272. It is made of shotcrete 280.
  • FIG. 6 is a cross-sectional view showing a state of the first surface finishing step according to the present invention.
  • the curved surface is grabbed by cutting and moving in the vertical direction of the bobsled stadium track 200 using a long screed tool, and then the curved pipe 278 is removed.
  • the plastering finish is performed by hand.
  • FIG. 7 is a cross-sectional view showing a state of the secondary surface finishing step and the wet curing step according to the present invention.
  • the second surface finishing step is a blush bar (Broom) to facilitate the adhesion of the ice to make the surface of the curved side portion 220, the bottom portion 240 and the tip portion 260 finished with the plastering on the track of the stadium Texture Finish) to rough the surface while moving in the vertical direction of the bobsled stadium track 200.
  • a blush bar Broom
  • the wet curing step is sprayed on the surface of the roughly surface-treated curved side portion 220, the bottom portion 240 and the tip portion 260 to minimize the protection from being adversely affected by drying, temperature change, load, impact, etc. After curing for 7 days or more, it is wet curing and completed construction.
  • the curing period may be further extended.
  • the ice is formed on the surface of the bobsled track 200, the bobsled stadium is completed.
  • the wet shotcrete composition according to the construction method of the present invention bobsled stadium is composed of 80 to 85% by volume of shotcrete and 15 to 20% by volume of air before blending, the shotcrete before blending based on 100% by weight of shotcrete before blending Coarse aggregate 18 ⁇ 28 wt%, fine aggregate 40 ⁇ 50 wt%, cement 12 ⁇ 22 wt%, water 3 ⁇ 13 wt%, silica fume 1.4 ⁇ 2.4 wt%, expander 1.6 ⁇ 2.6 wt%, high performance fluidizing agent 0.01 ⁇ 0.1 It comprises 0.0001 ⁇ 0.01% by weight of the weight percent AE agent, the AE agent is 0.0027 to 0.005 parts by weight based on 100 parts by weight of the cement.
  • the coarse aggregate in the shotcrete before mixing is less than 10mm in diameter, preferably 18 to 28% by weight, and 23.9% by weight, in order to reduce rebound during construction of landscape structures using the wet shotcrete composition of the present invention. More preferred.
  • the fine aggregate is preferably mixed at 40 to 50% by weight, more preferably 45.3% by weight for pumping and sticking performance.
  • the cement is usually preferably mixed at 12-22% by weight with Portland cement, more preferably 17.9% by weight.
  • Water-binder ratio (W / B) is a ratio used to express the amount of water to the unit binder, it is preferable to lower the value to have a value of 40% in order to prepare a wet shotcrete composition excellent in pumping performance and adhesion performance.
  • the binder means that the aggregate can be bonded in the concrete mixture, and in general, cement is representative, and in addition, the mixed material may be referred to as a binder when the mixed material acts as an adhesive by hydration reaction.
  • cement, silica fume and an expanding material are included in the binder.
  • the amount of unit required for the hydration in shotcrete is 15-25% of water-cement ratio, but the reason for maintaining water-cement ratio of 55 ⁇ 60% is that it is necessary to secure fluidity.
  • a high performance fluidizing agent described below is used together.
  • the silica fume is intended to increase the pumping performance and the pumping performance of the wet shotcrete composition.
  • the bobsled stadium is constructed using the wet shotcrete composition containing the silica fume, the watertightness and durability are excellent.
  • Silver is preferably mixed at 1.4 to 2.4% by weight, more preferably 1.9% by weight.
  • the present invention can compensate for shrinkage after pouring when using an expansion material (Calcium Sulfoaluminate, CSA) and also prevent cracking due to shrinkage, and for this purpose, the expansion material is preferably mixed at 1.6 to 2.6% by weight, More preferably, it is 2.2% by weight.
  • an expansion material Calcium Sulfoaluminate, CSA
  • the high performance fluidizing agent is preferably mixed at 0.01 to 0.1% by weight in order to secure the fluidity of the wet shotcrete, more preferably 0.05% by weight, and in the present invention, it is most preferable to use a polycarboxylic acid system.
  • the reason for using the polycarboxylic acid system is that the slump loss phenomenon of reading the fluidity occurs over time, the conventional naphtharene-based slump loss phenomenon increases with time, so that the change of slump after concrete mixing Although there is a problem that appears, using a polycarboxylic acid system can reduce the slump loss phenomenon and has the advantage of ensuring workability up to shotcrete work after concrete mixing.
  • the AE agent air entraining agent
  • air entraining agent is preferably mixed at 0.0001 to 0.01% by weight, more preferably 0.0005% by weight, and based on cement, it is mixed at 0.0027 to 0.005 parts by weight based on 100 parts by weight of the cement.
  • the initial excess air volume is secured to the shotcrete and the fluidity increases as the air acts as a bearing, and when the shotcrete adheres to the pouring surface at the same time as the shotcrete is placed, the air volume decreases rapidly and flows as the fluidity decreases. Bonding performance is increased by increasing yield value. It also has the effect of reducing the rebound rate during pouring.
  • Conventional concretes contain AE agent to increase the durability index (freeze-melting resistance) to secure 3 ⁇ 6% by volume of air.However, shotcrete used in Korea does not require high durability, so AE agent is included. There is no shotcrete material. In addition, the shotcrete has a problem in that the amount of air decreases due to the high-pressure injection due to the nature of the construction method, thereby reducing the amount of entrained air.
  • the amount of air according to the present invention has a feature of having 15 to 20% by volume before pouring, and 3 to 6% by volume after pouring, compared to the amount of air contained in conventional shotcrete.
  • the wet shotcrete composition comprising the above materials is preferably constructed immediately after production in the field using a mobile mixer equipment.
  • Table 1 is a compounding table showing the preferred blending ratio of the examples of the wet shotcrete composition according to the present invention.
  • the unit binder including the cement, the silica fume, and the expanding material of the shotcrete before blending may have a value of 440 to 480 kg / m 3 for the pumping performance and the sticking performance of the wet shotcrete composition. It is more preferable that it is kg / m ⁇ 3>.
  • the Gmax means the maximum dimension of the coarse aggregate, the maximum dimension of 10mm aggregate is made of aggregates of 10mm inner pack.
  • the S / a means the aggregate aggregate rate, the total aggregate volume used when producing 1000L (1m3) of concrete is a, and the aggregate aggregate volume is S.
  • each material is divided by density and calculated by volume to calculate the volume ratio that can produce 1000l (1m3), and then convert it to weight and convert the compounding ratio to the weight ratio of the material used for 1m3 production.
  • Table 2 shows the strength characteristics, workability and durability of the bobsled stadium constructed using the wet shotcrete composition according to the formulation table of Table 1.
  • the bobsled stadium according to the present invention has excellent compressive strength, adhesion strength and crack resistance, excellent workability and sufficient air volume, excellent freeze-thawing resistance, surface peeling resistance and waterproof performance. Able to know.
  • the present invention improves the construction of shotcrete, does not easily deteriorate and cracks for a long time compared to existing concrete, and has the effect of constructing bobsled stadiums through high-performance wet shotcrete composition with improved compressive strength, silica fume, expanded material and AE. It can be used to build a bobsled arena through high performance wet shotcrete composition with high pumping performance, rebound decreases during pouring, improved sticking performance after placing shotcrete, and high strength and high durability that does not cause shrinkage cracking during the hydration reaction. It has an effect.

Abstract

The present invention relates to a method for constructing a bobsleigh course using a high-performance wet-type shotcrete composition, and more particularly, to a method of constructing a bobsleigh course that uses a high-performance wet-type shotcrete composition which includes silica fumes and AE material, and which has increased pumpability prior to being deposited due to the presence of a superabundant amount of air, and increased shootability after being deposited since the amount of air present is decreased, thus imparting high constructability, high strength, and high durability to the composition. To this end, the method comprises: a framework-forming step of fixing a wire-mesh formwork, positioning a cooling pipe, strengthening adherence and holding strength, and installing a curvature-maintaining pipe; a shotcrete-laying step of laying the shotcrete composition; a first surface-finishing step of setting a curved surface and performing finishing using plastering; a second surface-finishing step of performing a rough surface finishing; and a wet curing step of performing wet curing.

Description

고성능 습식 숏크리트 조성물을 이용한 봅슬레이 경기장의 시공방법Construction method of bobsled stadium using high performance wet shotcrete composition
본 발명은 고성능 습식 숏크리트 조성물을 이용한 봅슬레이 경기장의 시공방법으로서, 더욱 상세하게는 실리카퓸과 AE제가 포함된 고성능 습식 숏크리트 조성물을 이용하여 타설 전에는 과다한 공기량이 확보되어 펌핑성능(Pumpability)이 증대되고 타설 후에는 공기량이 감소되어 붙임성능(Shotability)이 증대되는 등 고시공성, 고강도 및 고내구성을 가지는 고성능 습식 숏크리트 조성물을 통해 봅슬레이 경기장을 시공하는 방법에 관한 것이다.The present invention is a construction method of the bobsled stadium using a high performance wet shotcrete composition, more specifically, by using a high performance wet shotcrete composition containing silica fume and AE agent prior to pouring excessive pumping performance (pumpability) is increased and poured The present invention relates to a method for constructing a bobsled arena through a high performance wet shotcrete composition having high workability, high strength, and high durability, such as a decrease in air volume and an increase in shotability.
습식 숏크리트란, 건식 숏크리트와 구분되는 개념으로서, 재료의 혼합 시 물을 첨가하여 분사장치에 공급하고, 노즐에서 공기를 가하여 분사속도를 증가시켜 뿜어 붙이는 콘크리트를 말하며, 에어 압송식, 스크류 및 피스톤 펌프 압송식 공법으로 대별된다. 도 1은 종래 습식 숏크리트의 생산과정 및 시공방법을 나타낸 구성도이다.Wet shotcrete is a concept that is distinguished from dry shotcrete. It refers to concrete that adds water to the injector when water is mixed and supplies it to the sprayer by increasing the spraying speed by applying air from the nozzle. Air pressure type, screw and piston pump It is roughly classified as a press method. 1 is a block diagram showing the production process and construction method of the conventional wet shotcrete.
이 방법은 약 50년 전부터 사용되어 왔으며, 1970~1980년대에 그 장비와 재료의 개발이 특히 활발히 이루어졌다(ACI 506R-05).This method has been in use for about 50 years, and the development of the equipment and materials was particularly active in the 1970s and 1980s (ACI 506R-05).
습식 숏크리트는 일정한 배합비에 의해 미리 배합된 재료를 뿜어 붙이기 때문에, 건식 숏크리트에 비해 품질관리가 용이하며, 리바운드 및 분진이 적게 발생하는 장점이 있다.Wet shotcrete has the advantage of easy quality control and less rebound and dust generation than dry shotcrete because it sprays the pre-mixed material at a constant mixing ratio.
또한 시공량도 건식 숏크리트에 비해 커서 대량 공사에 적합하다.In addition, the construction volume is larger than dry shotcrete, which is suitable for mass construction.
반면에 장비가 대형이며 사용재료의 제약을 받는다는 점, 이송거리가 건식 숏크리트에 비해 짧다는 단점이 있다.On the other hand, the equipment is large and constrained by the materials used, and the transfer distance is shorter than dry shotcrete.
최근에는 구조물 및 유지보수용 습식 숏크리트 개발과 함께 장비의 용량 및 크기의 축소화와 작은 직경의 호스 적용을 위한 연구도 진행되고 있다.Recently, with the development of wet shotcrete for structure and maintenance, the research for the reduction of equipment capacity and size and the application of small diameter hoses are also in progress.
그런데, 종래의 습식 숏크리트의 성능을 증대하여 다양한 용도로 사용할 수 있도록 하기 위한 습식 숏크리트 조성물에 대한 연구의 필요성이 부각되어 왔으며, 그 이유는 다음과 같다.However, the necessity of research on the wet shotcrete composition for increasing the performance of the conventional wet shotcrete to be used in various applications has been highlighted, and the reason is as follows.
첫 번째로 국내에서 사용되는 숏크리트의 사용범위가 국한되어 있다는 점이다.First, the range of shotcrete used in Korea is limited.
국내에서 사용되는 숏크리트는 1차 지보재로 터널 및 지하공간 사면안정에 주로 사용되고, 초기 변형 억제용으로만 사용하고 있으며, 주구조재로 사용하지 않고 있으나, 최근 국외에서는 숏크리트가 주구조재인 터널 무라이닝 공법(싱글쉘 공법), 구조물의 주 구조물재료, 모든 구조물의 유지보수용으로도 사용되고 있다.Shotcrete used in Korea is mainly used for slope stabilization of tunnels and underground spaces as a primary support material, and is used only for suppressing initial deformation and is not used as a main structural material. It is also used for the maintenance of all structures.
이로 인하여 국내에서도 싱글쉘 공법과, 구조물 시공과 유지보수 등에 숏크리트 공법이 적용되는 것에 관심이 확대되고 있다. 즉 숏크리트의 고강도, 고내구성 및 고시공성을 위해 재료의 개발이 점차 요구되고 있는 실정이다.For this reason, the interest in the application of the shotcrete method to the single-shell method, construction and maintenance of the structure in Korea is increasing. That is, the development of materials is increasingly required for high strength, high durability, and high workability of shotcrete.
두 번째로 품질관리의 불량에 대한 점이다.The second point is about poor quality control.
국내에서 사용되는 숏크리트는 품질기준인 압축강도가 21MPa으로서 품질이 낮아서 국내에서 사용되는 숏크리트는 현재 1차 지보재 역할만하고 그 위에 콘크리트(터널: 라이닝)의 덧씌우기가 되어 장기강도 및 내구성 확보가 필요하지 않게 됨에 따라 초기에 변형을 막기 위한 초기강도 위주로 설계 시공되고 있고, 이로 인하여 숏크리트의 고성능화를 위한 노력 및 인식이 매우 부족하다.The shotcrete used in Korea is 21MPa, which is the quality standard, and the quality is low. Therefore, the shotcrete used in Korea currently serves only as the primary support material, and the concrete (tunnel: lining) can be overlaid to secure long-term strength and durability. As a result, the initial construction is mainly designed to prevent deformation, and thus, the efforts and recognition for the high performance of shotcrete are insufficient.
세 번째로 고성능 숏크리트의 개발 필요성이 부각되고 있다.Third, the need for developing high performance shotcrete is highlighted.
일반적으로 고성능 콘크리트의 정의는 콘크리트의 고강도화, 고내구성화로 정의되지만, 습식 숏크리트 경우 고성능화에 고시공성이 더해져야 한다. 이에 따라 최근에는 습식 숏크리트의 고성능화를 위해 고강도, 고내구성뿐만 아니라 고시공성(펌핑성능, 리바운드율, 붙임성능)에 대한 연구가 국내외적으로 활발히 이루어지고 있다.Generally, high performance concrete is defined as high strength and high durability of concrete, but in case of wet shotcrete, high workability should be added to high performance. Accordingly, in recent years, studies on high strength and high durability as well as high workability (pumping performance, rebound rate, pasting performance) have been actively conducted at home and abroad for the purpose of improving the performance of wet shotcrete.
습식 숏크리트는 펌프에 의해 재료가 호스를 통해 이송되는 과정과 대상물(대상구조물)에 뿜어 붙이는 과정으로 이루어지고, 이때 재료의 특성상 재료이송이 잘 되면서 숏크리트 타설시 흘러내리지 않는 높은 항복응력과 점성을 확보하여야 한다. 즉 펌핑성능이 우수한 유동성을 확보한 상태에서 숏크리트의 타설시 붙임성능이 우수한 재료가 필요하게 된다.Wet shotcrete consists of a process of transferring material through a hose by a pump and a process of spraying it onto an object (object structure) .At this time, the material transfers well due to the characteristics of the material and ensures high yield stress and viscosity that does not flow down during shotcrete placement. shall. In other words, it is necessary to have a material with excellent sticking performance when pouring shotcrete while securing fluidity with excellent pumping performance.
한편 종래의 콘크리트 패널 거푸집 시공방법으로 곡면이나 사면을 시공할 경우, 양생 후에 콘크리트 구조물이 견고하지 못하여 외부의 충격에 의해 파손이 쉽게 되는 문제점이 있고, 내구성이 떨어지는 경우 곡면의 표면이 불균형하여 안전사고가 우려되는 문제점이 있었다.On the other hand, when constructing curved surfaces or slopes using conventional concrete panel formwork, there is a problem that concrete structures are not firm after curing and are easily damaged by external impacts. There was a problem of concern.
특히 변화곡선으로 이루어진 봅슬레이 경기장의 트랙은 패널 거푸집의 시공이 어렵고, 동해저항성 및 수밀성이 요구되는 대표적인 구조물이다.In particular, the track of the bobsled stadium composed of the change curve is a representative structure that is difficult to construct the panel formwork, and requires the resistance of the sea and watertightness.
이에 본 발명은 상기와 같은 종래의 제반 문제점을 해결하기 위해 제안된 것으로, 본 발명의 목적은 이에 본 발명은 상기와 같은 종래의 제반 문제점을 해결하기 위해 제안된 것으로, 본 발명의 목적은 숏크리트의 시공성을 높이고 기존 콘크리트 비해 장기간 쉽게 열화 및 균열 발생되지 않으며 압축강도가 증진된 고성능 습식 숏크리트 조성물을 통해 봅슬레이 경기장의 시공방법을 제공하는 데에 있다.Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, the object of the present invention is that the present invention has been proposed to solve the above-mentioned conventional problems, the object of the present invention is that of shotcrete It is to provide a construction method of the bobsled stadium through the high performance wet shotcrete composition with improved construction properties, and does not easily deteriorate and cracks for a long time compared to the existing concrete, and has enhanced compressive strength.
본 발명의 다른 목적은 실리카퓸, 팽창재 및 AE제가 포함되어 펌핑성능이 우수하고 타설시 리바운드는 감소되며, 숏크리트 포설 후 붙임성능이 향상되고 수화반응과정에서 수축균열이 발생하지 않는 고강도 고내구성을 가지는 고성능 습식 숏크리트 조성물을 통해 봅슬레이 경기장의 시공방법을 제공하는 데에 있다.It is another object of the present invention to include silica fume, an expander and an AE agent, which has excellent pumping performance, reduces rebound during pouring, and improves the sticking performance after placing shotcrete and has high strength and high durability that does not cause shrinkage cracking during the hydration reaction. It is to provide a construction method of the bobsled stadium through a high performance wet shotcrete composition.
본 발명의 또 다른 목적은 동파 및 충격에 의한 파손을 방지할 수 있는 고성능 습식 숏크리트 조성물을 통해 경기 중에 안전사고를 방지하여 경기력을 향상시킬 수 있는 봅슬레이 경기장의 시공방법을 제공하는 데에 있다.Still another object of the present invention is to provide a construction method of a bobsled arena, which can improve performance by preventing safety accidents during a game through a high performance wet shotcrete composition capable of preventing damage caused by freezing and impact.
본 발명인 고성능 습식 숏크리트 조성물을 이용한 봅슬레이 경기장의 시공방법은 타공이 형성된 철망거푸집을 곡선형상인 곡선측부가 지지되도록 지지대에 고정시키고, 상기 철망거푸집의 곡선측부, 바닥부 및 선단부에 복수개의 쿨링파이프를 길이방향으로 배치하며, 습식 숏크리트 조성물의 부착성 및 결속력을 강화하기 위하여 상기 쿨링파이프가 덮히도록 철근을 격자형으로 배설하여 고정하고, 상기 철근의 상부면에 곡선을 유지시키기 위한 곡선유지 파이프를 일정 간격으로 이격되게 설치하는 형틀 제작단계, 습식 숏크리트 조성물을 제조하고, 상기 철망거푸집의 곡선측부 및 바닥부에 상기 습식 숏크리트 조성물을 포설하는 숏크리트 포설단계, 스크리드 도구를 이용하여 곡선 면잡기를 실시하고, 상기 곡선유지 파이프를 제거하여 상기 습식 숏크리트 조성물이 포설된 곡선측부 및 바닥부에 미장으로 마무리하는 1차 면마무리 단계, 상기 미장으로 마무리된 곡선측부, 바닥부 및 선단부의 표면을 얼음과의 부착이 용이하도록 거칠게 면처리하는 2차 면마무리 단계, 상기 거칠게 면처리된 곡선측부 및 바닥부의 표면에 살수하여 습윤양생을 하는 습윤양생단계가 포함되어 이루어지고, 상기 습식 숏크리트 조성물은, 배합전 숏크리트 80~85 부피%와 공기량 15~20 부피%가 배합되어 이루어지되, 상기 배합전 숏크리트는 배합전 숏크리트 100 중량%를 기준으로 하여 굵은골재 18~28 중량%, 잔골재 40~50 중량%, 시멘트 12~22 중량%, 물 3~13 중량%, 실리카퓸 1.4~2.4 중량%, 팽창재 1.6~2.6 중량%, 고성능 유동화제 0.01~0.1 중량% AE제 0.0001~0.01 중량%가 포함되어 이루어지고, 상기 AE제는 상기 시멘트 100 중량부에 대하여 0.0027~0.005 중량부이다.The construction method of the bobsled arena using the high performance wet shotcrete composition of the present invention is fixed to the support to support the curved side of the wire mesh form formed perforations, a plurality of cooling pipes on the curved side, the bottom and the front end of the wire mesh formwork Arranged in the longitudinal direction, in order to enhance the adhesion and binding force of the wet shotcrete composition, the reinforcing bar is disposed in a lattice so as to cover the cooling pipe, and the curved maintenance pipe for maintaining a curve on the upper surface of the rebar is fixed Forming step to install spaced apart at intervals, manufacturing a wet shotcrete composition, the shotcrete step of laying the wet shotcrete composition on the curved side and the bottom of the wire mesh formwork, using a screed tool to perform a curved cotton wool By removing the curved pipe A first surface finishing step of finishing plastering on the curved side and the bottom of the shotcrete composition, the second side of the surface of the curved side, the bottom and the tip of the plastering to roughen the surface to facilitate adhesion with ice. Finishing step, comprising a wet curing step of wet curing by spraying on the surface of the roughly curved surface and the bottom portion, the wet shotcrete composition, 80 ~ 85% by volume of shotcrete and 15 to 20% by volume of air % Is blended, the shotcrete before the formulation is based on 100% by weight of shotcrete before mixing 18 ~ 28% by weight of coarse aggregate, 40 ~ 50% by weight of aggregate, 12 ~ 22% by weight of cement, 3 ~ 13% by weight of water , 1.4 to 2.4 wt% silica fume, 1.6 to 2.6 wt% expander, 0.01 to 0.1 wt% high-performance fluidizing agent comprises 0.0001 to 0.01 wt% of AE agent, the AE agent is 0.0 to 100 parts by weight of the cement 027 to 0.005 parts by weight.
본 발명은 숏크리트의 시공성을 높이고 기존 콘크리트 비해 장기간 쉽게 열화 및 균열 발생되지 않으며 압축강도가 증진된 고성능 습식 숏크리트 조성물을 통해 봅슬레이 경기장을 시공할 수 있는 효과가 있다.The present invention has the effect of increasing the construction properties of the shotcrete and bobsled stadium through the high-performance wet shotcrete composition with high compressive strength that does not easily deteriorate and cracks for a long time compared to conventional concrete.
또한 실리카퓸, 팽창재 및 AE제가 포함되어 펌핑성능이 우수하고 타설시 리바운드는 감소되며, 숏크리트 포설 후 붙임성능이 향상되고 수화반응과정에서 수축균열이 발생하지 않는 고강도 고내구성을 가지는 고성능 습식 숏크리트 조성물을 통해 봅슬레이 경기장을 시공할 수 있는 효과가 있다.In addition, silica fume, an expansion material and AE agent are included to provide a high performance wet shotcrete composition with high strength and high durability, which has excellent pumping performance, reduces rebound during pouring, improves sticking performance after placing shotcrete, and does not cause shrinkage cracking during the hydration reaction. Through the bobsled arena can be constructed.
또한 동파 및 충격에 의한 파손을 방지할 수 있는 고성능 습식 숏크리트 조성물을 통해 경기 중에 안전사고를 방지하여 경기력을 향상시킬 수 있는 봅슬레이 경기장을 시공할 수 있는 효과가 있다.In addition, through the high-performance wet shotcrete composition that can prevent breakage due to freezing and impact has the effect of installing a bobsled arena that can improve the performance by preventing safety accidents during the game.
도 1는 본 발명의 흐름도.1 is a flow chart of the present invention.
도 2는 본 발명에 따른 봅슬레이 경기장의 부분절개 사시도.2 is a partial cutaway perspective view of a bobsled stadium according to the present invention;
도 3은 본 발명에 따른 봅슬레이 경기장의 단면도.3 is a sectional view of a bobsled stadium according to the present invention;
도 4는 본 발명에 따른 형틀 제작단계의 상태를 나타낸 단면도.Figure 4 is a cross-sectional view showing a state of the mold manufacturing step according to the present invention.
도 5는 본 발명에 따른 숏크리트 포설단계의 상태를 나타낸 단면도.5 is a cross-sectional view showing a state of the shotcrete installation step according to the present invention.
도 6은 본 발명에 따른 1차 면마무리 단계의 상태를 나타낸 단면도.Figure 6 is a cross-sectional view showing a state of the first surface finishing step according to the present invention.
도 7은 본 발명에 따른 2차 면마무리 단계 및 습윤양생단계의 상태를 나타낸 단면도.Figure 7 is a cross-sectional view showing the state of the second surface finishing step and the wet curing step according to the present invention.
*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
100 : 지지대 200 : 봅슬레이 트랙100: support 200: bobsled track
220 : 곡선측부 240 : 바닥부220: curved side 240: bottom
260 : 선단부 270 : 형틀260: tip 270: the mold
272 : 철망거푸집 274 : 쿨링파이프272: wire mesh formwork 274: cooling pipe
276 : 철근 278 : 곡선유지 파이프276: rebar 278: curved pipe
280 : 숏크리트280: shotcrete
본 발명인 고성능 습식 숏크리트 조성물을 이용한 봅슬레이 경기장의 시공방법을 상세히 설명하면 다음과 같다.Referring to the construction method of the bobsled stadium using the present invention high performance wet shotcrete composition as follows.
하기에서 본 발명을 설명함에 있어 관련된 공지 기능 또는 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명을 생략할 것이다. 그리고 후술되는 용어들은 본 발명에서의 기능을 고려하여 정의된 용어들로서, 이는 사용자, 운용자의 의도 또는 판례 등에 따라 달라질 수 있으며, 이에 따라 각 용어의 의미는 본 명세서 전반에 걸친 내용을 토대로 해석되어야 할 것이다.In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or precedent of a user or an operator, and thus, the meaning of each term should be interpreted based on the contents throughout the present specification. will be.
먼저 도 1은 본 발명인 봅슬레이 경기장 시공방법의 흐름도이고, 도 2 및 도 3은 본 발명에 따라 시공이 완료된 봅슬레이 경기장을 나타낸 부분절개 사시도 및 단면도이다.First, Figure 1 is a flow chart of the bobsled stadium construction method of the present invention, Figures 2 and 3 are partial cutaway perspective view and cross-sectional view showing the bobsled stadium construction completed in accordance with the present invention.
본 발명인 고성능 습식 숏크리트 조성물을 이용한 봅슬레이 경기장의 시공방법은 형틀 제작단계, 숏크리트 포설단계, 1차 면마무리 단계, 2차 면마무리 단계, 습윤양생단계가 포함되어 이루어진다.The construction method of the bobsled stadium using the high-performance wet shotcrete composition of the present invention includes a mold fabrication step, a shotcrete laying step, a first surface finishing step, a second surface finishing step, and a wet curing step.
도 4는 본 발명에 따른 형틀 제작단계의 상태를 나타낸 단면도이다.Figure 4 is a cross-sectional view showing a state of the mold manufacturing step according to the present invention.
봅슬레이 경기장의 트랙(200)을 제작하기 위한 상기 형틀(270) 제작단계는 철망거푸집(Stay Form)(272)을 고정하고, 쿨링파이프(274)를 배치하고, 철근(276)을 배설하여 부착성 및 결속력을 강화시키고, 곡선유지 파이프(278)를 설치하는 단계로 나뉜다.The mold 270 manufacturing step for manufacturing the track 200 of the bobsled stadium is fixed to the wire formwork (Stay Form) 272, the cooling pipe 274 is disposed, the reinforcing bars 276 to the adhesiveness And strengthening the binding force, and is divided into the step of installing the curve maintaining pipe (278).
상기 철망거푸집(272)을 고정하는 것은 종횡 방향으로 형성된 철근 등에 메쉬망 부재가 부착되어 철망이 형성된 철망거푸집(270)을 곡선형상인 곡선측부(240)가 지지되도록 지지대(100)에 고정한다.Fixing the wire mesh formwork 272 is fixed to the support 100 so that the mesh mesh member 270 is attached to the rebars formed in the longitudinal and horizontal direction so that the wire mesh formwork 270 having the wire mesh is curved to support the curved side portion 240.
상기 철망거푸집(272)은 습식 숏크리트 조성물을 포설하는 장비가 고압으로 타설하였을 때 곡선형상을 유지해야하고, 제작이 용이한 재질이어야 한다. 또한 철망거푸집(272)의 철망 사이로 습식 숏크리트 조성물이 정체될 수 있는 간격을 유지해야하고, 포설 후에는 철망거푸집(272)이 습식 숏크리트 조성물과 일체화되는 것이다.The wire mesh formwork 272 should maintain a curved shape when the equipment for installing the wet shotcrete composition is poured at a high pressure, and the material should be easy to manufacture. In addition, between the wire mesh of the wire mesh formwork 272 to maintain a gap in which the wet shotcrete composition can be stagnant, and after installation, the wire mesh formwork 272 is integrated with the wet shotcrete composition.
상기 쿨링파이프(274)를 배치하는 것은 철망거푸집(272)의 곡선측부(220), 바닥부(240) 및 선단부(260)에 복수개의 쿨링파이프(274)를 봅슬레이 경기장의 트랙(200) 길이방향으로 배치한다.Arranging the cooling pipe 274 is a plurality of cooling pipes 274 on the curved side portion 220, the bottom portion 240 and the tip portion 260 of the wire mesh formwork 272 in the longitudinal direction of the track 200 of the bobsled stadium To place.
상기 부착성 및 결속력을 강화시키는 것은 습식 숏크리트 조성물의 부착성 및 결속력을 강화하기 위하여 쿨링파이프(274)가 덮히도록 철근(276)을 격자형으로 배설하여 고정한다. 상기 철근 대신에 와이어메쉬를 사용하거나, 철근과 와이어메쉬를 함께 사용할 수도 있다.Enhancing the adhesion and binding force is to arrange and secure the reinforcing bar 276 in a lattice so that the cooling pipe 274 is covered in order to enhance the adhesion and binding force of the wet shotcrete composition. Wire meshes may be used instead of the reinforcing bars, or steel bars and wire meshes may be used together.
상기 곡선유지 파이프(규준틀)(278)를 설치하는 것은 철근(276)의 상부면에 곡선을 유지시키기 위한 곡선유지 파이프(278)를 일정 간격으로 이격되게 설치한다.Installing the curved maintenance pipe (normative frame) 278 installs the curved maintenance pipe 278 spaced at regular intervals to maintain the curve on the upper surface of the rebar 276.
상기 곡선유지 파이프(278)는 봅슬레이 경기장 트랙(200) 내부의 변화곡선을 시공하기 위한 장치로 곡선 가공 조립이 용이하여야 하고, 또한 습식 숏크리트 조성물을 포설하는 장비의 고압에 의해 변형이 되지 않아야 하며, 후술하는 1차 면마무리 단계에서 곡선 면잡기 후 제거가 용이해야 한다.The curve maintaining pipe 278 is a device for constructing the change curve inside the bobsled stadium track 200 should be easy to assemble the curve processing, and also should not be deformed by the high pressure of the equipment to install the wet shotcrete composition, It should be easy to remove the curved surface after the first surface finishing step to be described later.
도 5는 본 발명에 따른 숏크리트 포설단계의 상태를 나타낸 단면도이다.5 is a cross-sectional view showing a state of the shotcrete laying step according to the present invention.
상기 숏크리트 포설단계는 바닥부, 곡선측부 및 선단부에 습식 숏크리트 조성물을 포설하여 부착시킨 다음에, 상기 습식 숏크리트 조성물을 포설할 때 리바운드되어 발생된 숏크리트 이물질을 제거한다.In the shotcrete laying step, the wet shotcrete composition is installed by attaching the wet shotcrete composition to the bottom portion, the curved side portion, and the front end portion, and then, when the wet shotcrete composition is laid, the foreign substance generated by the rebounding is removed.
상기 숏크리트 포설단계에서 타설면은 바닥부 타설 후에 곡선측부와 선단부의 순서대로 숏크리트를 타설하고, 타설이음(시공이음)이 발생된 경우에는 먼저 리바운드된 이물질을 제거한 다음에 타설해야 한다.In the shotcrete laying step, the shotcrete is poured in the order of the curved side and the tip portion after the bottom casting, and in the case of the casting joint (construction joint), the foreign material that is rebound must be removed and then poured.
타설시에 노즐은 항상 뿜어 붙이는 면에 수직이 되도록 유지되게 하고, 적절한 뿜어 붙이는 거리와 뿜는 압력을 유지하여야 하고, 포설된 습식 숏크리트 조성물이 흘러내리지 않는 범위의 적당한 두께로 뿜어 붙여 소정의 두께가 될 때까지 반복해서 뿜어 붙여야 한다.When pouring, the nozzle should always be kept perpendicular to the spraying surface, maintain the proper spraying distance and spraying pressure, and spray the sprayed to the desired thickness within the range that the installed wet shotcrete composition will not flow down. You need to spray it repeatedly.
철근(276)이 있는 면은 최소 피복두께를 최소 25mm로 유지해야 하고, 쿨링파이프(274) 및 철근(276)이 설치된 곳에 실시할 때는 각 구성의 사이에 공극이 생기지 않도록 뿜어 붙여야 하며, 비가 오거나 기온이 5℃ 이하인 경우에는 포설을 실시하지 않아야 한다.The surface with the rebar 276 should be kept to a minimum coating thickness of at least 25 mm, and when carried out where the cooling pipe 274 and the reinforcing bar 276 are installed, they should be sprayed so as not to form voids between the respective components, If the temperature is below 5 ° C, no laying should be done.
상기 포설된 습식 숏크리트 조성물은 철망거푸집(272)의 곡선측부(220), 바닥부(240) 및 선단부(260)에 스며들어 철망거푸집(272)의 뒤쪽까지 형성되어 철망거푸집(272)과 함께 일체화되어 숏크리트(280)로 이루어진다.The laid wet shotcrete composition penetrates the curved side portion 220, the bottom portion 240, and the tip portion 260 of the wire mesh formwork 272 to the rear of the wire mesh formwork 272 to be integrated with the wire mesh formwork 272. It is made of shotcrete 280.
도 6은 본 발명에 따른 1차 면마무리 단계의 상태를 나타낸 단면도이다.6 is a cross-sectional view showing a state of the first surface finishing step according to the present invention.
상기 1차 면마무리 단계는 길이가 긴 스크리드(screed) 도구를 이용하여 봅슬레이 경기장 트랙(200)의 상하 방향으로 움직이면서 깎아내는 방법으로 곡선 면잡기를 실시하고, 곡선유지 파이프(278)를 제거한 다음에, 습식 숏크리트 조성물이 포설된 곡선측부(220), 바닥부(240) 및 선단부(260)에 손미장으로 미장 마무리를 한다.In the first surface finishing step, the curved surface is grabbed by cutting and moving in the vertical direction of the bobsled stadium track 200 using a long screed tool, and then the curved pipe 278 is removed. On the curved side part 220, the bottom part 240, and the tip end part 260 in which the wet shotcrete composition was installed, the plastering finish is performed by hand.
도 7은 본 발명에 따른 2차 면마무리 단계 및 습윤양생단계의 상태를 나타낸 단면도이다.7 is a cross-sectional view showing a state of the secondary surface finishing step and the wet curing step according to the present invention.
상기 2차 면마무리 단계는 상기 미장으로 마무리된 곡선측부(220), 바닥부(240) 및 선단부(260)의 표면을 경기장의 트랙에 빙상을 만들기 위한 얼음과의 부착이 용이하도록 블러쉬막대(Broom Texture Finish)를 사용하여 봅슬레이 경기장 트랙(200)의 상하 방향으로 움직이면서 거칠게 면처리한다.The second surface finishing step is a blush bar (Broom) to facilitate the adhesion of the ice to make the surface of the curved side portion 220, the bottom portion 240 and the tip portion 260 finished with the plastering on the track of the stadium Texture Finish) to rough the surface while moving in the vertical direction of the bobsled stadium track 200.
상기 습윤양생단계는 상기 거칠게 면처리된 곡선측부(220), 바닥부(240) 및 선단부(260)의 표면에 살수하여 건조, 온도변화, 하중, 충격 등의 나쁜 영향을 받지 않도록 보호하기 위하여 최소 7일 이상 양생하는 것으로 습윤양생을 하고 시공을 완료한다.The wet curing step is sprayed on the surface of the roughly surface-treated curved side portion 220, the bottom portion 240 and the tip portion 260 to minimize the protection from being adversely affected by drying, temperature change, load, impact, etc. After curing for 7 days or more, it is wet curing and completed construction.
상기 습윤양생단계에서 대기온도가 0℃ 이하인 경우에는 양생기간을 더 연장할 수 있다.If the atmospheric temperature is 0 ° C. or less in the wet curing step, the curing period may be further extended.
시공이 완료되면 봅슬레이 트랙(200)의 표면에 얼음을 형성시켜 봅슬레이 경기장이 완성된다.When the construction is completed, the ice is formed on the surface of the bobsled track 200, the bobsled stadium is completed.
본 발명인 봅슬레이 경기장의 시공방법에 따른 상기 습식 숏크리트 조성물은 배합전 숏크리트 80~85 부피%와 공기량 15~20 부피%가 배합되어 이루어지되, 상기 배합전 숏크리트는 배합전 숏크리트 100 중량%를 기준으로 하여 굵은골재 18~28 중량%, 잔골재 40~50 중량%, 시멘트 12~22 중량%, 물 3~13 중량%, 실리카퓸 1.4~2.4 중량%, 팽창재 1.6~2.6 중량%, 고성능 유동화제 0.01~0.1 중량% AE제 0.0001~0.01 중량%가 포함되어 이루어지고, 상기 AE제는 상기 시멘트 100 중량부에 대하여 0.0027~0.005 중량부이다.The wet shotcrete composition according to the construction method of the present invention bobsled stadium is composed of 80 to 85% by volume of shotcrete and 15 to 20% by volume of air before blending, the shotcrete before blending based on 100% by weight of shotcrete before blending Coarse aggregate 18 ~ 28 wt%, fine aggregate 40 ~ 50 wt%, cement 12 ~ 22 wt%, water 3 ~ 13 wt%, silica fume 1.4 ~ 2.4 wt%, expander 1.6 ~ 2.6 wt%, high performance fluidizing agent 0.01 ~ 0.1 It comprises 0.0001 ~ 0.01% by weight of the weight percent AE agent, the AE agent is 0.0027 to 0.005 parts by weight based on 100 parts by weight of the cement.
상기 배합전 숏크리트에서 상기 굵은골재는 본 발명인 습식 숏크리트 조성물을 이용하여 경관 구조물의 시공시 리바운드를 줄이기 위하여 지름은 10㎜ 이하이고, 18~28 중량%로 혼합되는 것이 바람직하며, 23.9 중량%인 것이 더욱 바람직하다.The coarse aggregate in the shotcrete before mixing is less than 10mm in diameter, preferably 18 to 28% by weight, and 23.9% by weight, in order to reduce rebound during construction of landscape structures using the wet shotcrete composition of the present invention. More preferred.
상기 잔골재는 펌핑성능과 붙임성능을 위해 40~50 중량%로 혼합되는 것이 바람직하고, 45.3 중량%인 것이 더욱 바람직하다.The fine aggregate is preferably mixed at 40 to 50% by weight, more preferably 45.3% by weight for pumping and sticking performance.
상기 시멘트는 보통 포틀랜드 시멘트로 12~22 중량%로 혼합되는 것이 바람직하고, 17.9 중량%인 것이 더욱 바람직하다.The cement is usually preferably mixed at 12-22% by weight with Portland cement, more preferably 17.9% by weight.
물-바인더비(W/B)는 단위결합재에 대한 물의 양을 표현하고자 사용되는 비율로서, 펌핑성능과 붙임성능이 우수한 습식 숏크리트 조성물을 제조하기 위하여 40%인 값을 갖도록 낮추는 것이 바람직하다.Water-binder ratio (W / B) is a ratio used to express the amount of water to the unit binder, it is preferable to lower the value to have a value of 40% in order to prepare a wet shotcrete composition excellent in pumping performance and adhesion performance.
이때 상기 바인더는 콘크리트 배합에서 골재를 접착할 수 있는 것을 뜻하며, 일반적으로 시멘트가 대표적이고, 그 외에 혼화재료가 수화반응하여 접착제로서 역할을 할 경우 상기 혼화재료도 바인더라고 할 수 있다.In this case, the binder means that the aggregate can be bonded in the concrete mixture, and in general, cement is representative, and in addition, the mixed material may be referred to as a binder when the mixed material acts as an adhesive by hydration reaction.
본 발명에 따른 상기 습식 숏크리트 조성물은 시멘트, 실리카퓸 및 팽창재가 바인더에 포함된다. In the wet shotcrete composition according to the present invention, cement, silica fume and an expanding material are included in the binder.
숏크리트에서 수화반응을 위해 필요한 단위수량은 물-시멘트비가 15~25%이지만, 일반적으로 물-시멘트비를 55~60%로 유지하는 이유는 유동성을 확보해야 하기 때문이다. 그러나, 본 발명에 따른 습식 숏크리트 조성물을 제조하기 위해서는 물-바인더비를 40%로 낮추는 것이 필요하고, 이를 위하여 후술하는 고성능 유동화제를 같이 사용한다.The amount of unit required for the hydration in shotcrete is 15-25% of water-cement ratio, but the reason for maintaining water-cement ratio of 55 ~ 60% is that it is necessary to secure fluidity. However, in order to prepare the wet shotcrete composition according to the present invention, it is necessary to lower the water-binder ratio to 40%, and for this purpose, a high performance fluidizing agent described below is used together.
상기 실리카퓸은 습식 숏크리트 조성물의 펌핑성능 및 뿜칠성능을 증대시키기 위한 것으로, 상기 실리카퓸이 포함된 습식 숏크리트 조성물을 이용하여 봅슬레이 경기장을 시공하게 되면 수밀성과 내구성이 우수하게 되며, 이를 위하여 상기 실리카퓸은 1.4~2.4 중량%로 혼합되는 것이 바람직하고, 1.9 중량%인 것이 더욱 바람직하다.The silica fume is intended to increase the pumping performance and the pumping performance of the wet shotcrete composition. When the bobsled stadium is constructed using the wet shotcrete composition containing the silica fume, the watertightness and durability are excellent. Silver is preferably mixed at 1.4 to 2.4% by weight, more preferably 1.9% by weight.
단위 시멘트량이 높은 습식 숏크리트의 배합은 자기수축 및 건조수축이 발생할 우려가 크기 때문에 양생시 수분증발의 억제와 수축저감이 필요하고, 이를 위하여 현장조건에 따라 양생은 습윤양생 및 피막양생(양생제)등을 하고 있으나, 대부분이 기건상태에서 양생을 하기 때문에 수분증발에 따른 수축균열이 발생하게 된다.Since the mixing of wet shotcrete with a high unit cement content is likely to cause self-shrinkage and dry shrinkage, it is necessary to suppress moisture evaporation and reduce shrinkage during curing. Although most of them are cured in the air condition, shrinkage cracks occur due to evaporation of water.
본 발명은 팽창재(Calcium Sulfoaluminate, CSA)를 사용하게 되면 타설 후 수축되는 것을 보상할 수 있고 또한 수축으로 인한 균열을 막을 수 있으며, 이를 위해 상기 팽창재는 1.6~2.6 중량%로 혼합되는 것이 바람직하고, 2.2 중량%인 것이 더욱 바람직하다.The present invention can compensate for shrinkage after pouring when using an expansion material (Calcium Sulfoaluminate, CSA) and also prevent cracking due to shrinkage, and for this purpose, the expansion material is preferably mixed at 1.6 to 2.6% by weight, More preferably, it is 2.2% by weight.
상기 고성능 유동화제는 습식 숏크리트의 유동성 확보를 위해 0.01~0.1 중량%로 혼합되는 것이 바람직하고, 0.05 중량%인 것이 더욱 바람직하며, 본 발명에서는 폴리카본산계를 사용하는 것이 가장 우수한 효과를 나타낸다.The high performance fluidizing agent is preferably mixed at 0.01 to 0.1% by weight in order to secure the fluidity of the wet shotcrete, more preferably 0.05% by weight, and in the present invention, it is most preferable to use a polycarboxylic acid system.
상기 폴리카본산계를 사용하는 이유는 시간의 흐름에 따라 유동성을 읽어버리는 슬럼프 로스 현상이 발생하게 되는데, 종래의 나프타렌 계열은 시간에 따라 슬럼프 로스 현상이 커지게 되어 콘크리트 배합 후 슬럼프의 변화게 크게 나타나는 문제가 있지만, 폴리카본산계를 사용하게 되면 슬럼프 로스 현상을 줄일 수 있고 콘크리트 배합 후에 숏크리트 작업까지 작업성을 확보할 수 있는 장점이 있다.The reason for using the polycarboxylic acid system is that the slump loss phenomenon of reading the fluidity occurs over time, the conventional naphtharene-based slump loss phenomenon increases with time, so that the change of slump after concrete mixing Although there is a problem that appears, using a polycarboxylic acid system can reduce the slump loss phenomenon and has the advantage of ensuring workability up to shotcrete work after concrete mixing.
상기 AE제(공기연행제)는 0.0001~0.01 중량%로 혼합되는 것이 바람직하고, 0.0005 중량%인 것이 더욱 바람직하며, 시멘트를 기준으로 하면 상기 시멘트 100 중량부에 대하여 0.0027~0.005 중량부로 혼합된다.The AE agent (air entraining agent) is preferably mixed at 0.0001 to 0.01% by weight, more preferably 0.0005% by weight, and based on cement, it is mixed at 0.0027 to 0.005 parts by weight based on 100 parts by weight of the cement.
AE제를 사용하게 되면 숏크리트에 초기 과다공기량이 확보되어 공기들이 베어링 역할을 함에 따라 유동성이 증가하게 되고, 숏크리트의 타설과 동시에 타설면에 숏크리트가 붙으면 공기량이 급감소하게 되어 유동성이 감소함에 따라 흘러내리는 항복치의 증대로 붙임성능이 증대된다. 또한 타설시 리바운드율이 감소하게 되는 효과도 갖게 된다.When AE agent is used, the initial excess air volume is secured to the shotcrete and the fluidity increases as the air acts as a bearing, and when the shotcrete adheres to the pouring surface at the same time as the shotcrete is placed, the air volume decreases rapidly and flows as the fluidity decreases. Bonding performance is increased by increasing yield value. It also has the effect of reducing the rebound rate during pouring.
종래의 일반적인 콘크리트는 내구성 지수(동결융해저항성)를 높이기 위해 AE제를 혼입하여 공기량을 3~6 부피% 정도로 확보하기도 하지만, 국내에서 사용되는 숏크리트는 사용범위가 고내구성을 요하지 않기 때문에 AE제가 포함된 숏크리트 재료가 전무한 실정이다. 또한 숏크리트는 시공 방법의 특성상 고압분사를 하게 됨에 따라 공기량이 감소하게 되고, 이로 인하여 연행공기량이 감소하게 되는 문제점이 있었다.Conventional concretes contain AE agent to increase the durability index (freeze-melting resistance) to secure 3 ~ 6% by volume of air.However, shotcrete used in Korea does not require high durability, so AE agent is included. There is no shotcrete material. In addition, the shotcrete has a problem in that the amount of air decreases due to the high-pressure injection due to the nature of the construction method, thereby reducing the amount of entrained air.
본 발명에 따른 공기량은 종래 숏크리트에 포함된 공기량에 비해 타설하기 전에는 15~20 부피%를 갖고, 타설 후에도 3~6 부피%를 갖는 특징이 있다.The amount of air according to the present invention has a feature of having 15 to 20% by volume before pouring, and 3 to 6% by volume after pouring, compared to the amount of air contained in conventional shotcrete.
상기의 재료들이 포함되어 이루어진 습식 숏크리트 조성물은 이동식 믹서 장비를 이용하여 현장에서 생산 후 바로 시공하는 것이 바람직하다.The wet shotcrete composition comprising the above materials is preferably constructed immediately after production in the field using a mobile mixer equipment.
현장에서 생산 후 바로 시공하게 되면, 시공의 효율성이 증대되고 고품질을 일정하게 유지할 수 있는 장점이 있다.If the construction immediately after production in the field, there is an advantage that can increase the efficiency of the construction and maintain a constant high quality.
이하 본 발명인 습식 숏크리트 조성물의 효과를 알아보기 위한 시험 결과에 대하여 설명한다.Hereinafter, the test results for determining the effects of the present invention wet shotcrete composition will be described.
표 1
Gmax(mm) Slump(mm) Air(%) W/B(%) S/a(%) Unit Weight (kg/㎥)
굵은골재 잔골재 시멘트 물 실리카퓸 팽창제 고성능유동화재 AE제
10 80±30 숏팅전15~20 40 65 500 950 374 184 40 46 0.1~1.5 0.01~0.02
숏팅후3~6
Table 1
Gmax (mm) Slump (mm) Air (%) W / B (%) S / a (%) Unit Weight (kg / ㎥)
Coarse aggregate Fine aggregate cement water Silica fume Inflator High Performance Liquid Fire AE
10 80 ± 30 15-20 before shorting 40 65 500 950 374 184 40 46 0.1-1.5 0.01 ~ 0.02
3 ~ 6 after shorting
표 1은 본 발명에 따른 습식 숏크리트 조성물의 실시예인 바람직한 배합비율을 나타낸 배합표이다.Table 1 is a compounding table showing the preferred blending ratio of the examples of the wet shotcrete composition according to the present invention.
상기 배합표에서 상기 배합전 숏크리트의 상기 시멘트, 상기 실리카퓸 및 상기 팽창재가 포함되어 이루어진 단위 결합재는 습식 숏크리트 조성물의 펌핑성능과 붙임성능을 위해 440~480㎏/㎥인 값을 갖는 것이 바람직하고, 460㎏/㎥인 것이 더욱 바람직하다.In the compounding table, the unit binder including the cement, the silica fume, and the expanding material of the shotcrete before blending may have a value of 440 to 480 kg / m 3 for the pumping performance and the sticking performance of the wet shotcrete composition. It is more preferable that it is kg / m <3>.
상기 Gmax는 굵은골재의 최대치수를 뜻하고, 최대치수 10㎜ 골재는 10㎜ 안 팍의 골재가 포함되어 이루어진다.The Gmax means the maximum dimension of the coarse aggregate, the maximum dimension of 10mm aggregate is made of aggregates of 10mm inner pack.
상기 S/a는 잔골재율을 뜻하는 것으로, 콘크리트 1000ℓ(1㎥)를 생산할 때 사용되는 전체 골재 체적이 a이고, 잔골재 체적이 S이다.The S / a means the aggregate aggregate rate, the total aggregate volume used when producing 1000L (1㎥) of concrete is a, and the aggregate aggregate volume is S.
국내 콘크리트(숏크리트) 배합설계에서는 각 재료를 밀도로 나누고 체적으로 계산하여 1000ℓ(1㎥)를 생산할 수 있는 체적비를 계산한 뒤에 이를 다시 중량으로 환산하여 1㎥ 생산시 사용되는 재료의 중량비로 배합비를 결정한다.In domestic concrete (shotcrete) mixing design, each material is divided by density and calculated by volume to calculate the volume ratio that can produce 1000ℓ (1㎥), and then convert it to weight and convert the compounding ratio to the weight ratio of the material used for 1㎥ production. Decide
표 2
구분 품질목표 시험결과 특성
강도특성 28일 압축강도 35MPa 이상 49MPa 압축강도 우수
부착강도 1.4MPa 이상 2.0MPa 부착강도 우수
휨강도 4.5MPa 이상 6.1MPa 균열저항성 우수
작업성 슬럼프 범위 6~10cm 8cm 작업성 및 공기량 확보
공기량 범위 3~6% 4%
내구성 동결융해저항성 90% 이상 91 동결융해저항성 우수
표면박리저항성 1등급 1등급 표면박리저항성 우수
염소이온투과저항성 100쿨롱 이하 906쿨롱 방수성능 발휘
TABLE 2
division Quality goal Test result characteristic
Strength characteristics 28 days compressive strength 35 MPa or more 49 MPa Excellent compressive strength
Adhesion strength 1.4 MPa or more 2.0 MPa Excellent adhesion strength
Flexural strength 4.5 MPa or more 6.1 MPa Excellent crack resistance
Workability Slump range 6 ~ 10cm 8 cm Workability and air volume
Air volume range 3-6% 4%
durability Freeze thaw resistance over 90 91 Excellent freeze-thawing resistance
Surface Peeling Resistance Grade 1 Grade 1 Excellent surface peeling resistance
Chlorine Ion Permeation Resistance 100 coulombs or less 906 coulomb Waterproof performance
표 2는 표 1의 배합표에 의한 습식 숏크리트 조성물을 이용하여 시공한 봅슬레이 경기장의 강도특성, 작업성 및 내구성을 나타내었다.Table 2 shows the strength characteristics, workability and durability of the bobsled stadium constructed using the wet shotcrete composition according to the formulation table of Table 1.
상기 표 2를 통해 본 발명에 따른 봅슬레이 경기장의 압축강도, 부착강도 및 균열저항성이 우수한 것을 알 수 있고, 작업성이 뛰어나고 충분한 공기량이 확보되며, 동결융해저항성, 표면박리저항성 및 방수성능이 우수한 것을 알 수 있다.It can be seen from Table 2 that the bobsled stadium according to the present invention has excellent compressive strength, adhesion strength and crack resistance, excellent workability and sufficient air volume, excellent freeze-thawing resistance, surface peeling resistance and waterproof performance. Able to know.
이상과 같이 본 발명은 숏크리트의 시공성을 높이고 기존 콘크리트 비해 장기간 쉽게 열화 및 균열 발생되지 않으며 압축강도가 증진된 고성능 습식 숏크리트 조성물을 통해 봅슬레이 경기장을 시공할 수 있는 효과가 있고, 실리카퓸, 팽창재 및 AE제가 포함되어 펌핑성능이 우수하고 타설시 리바운드는 감소되며, 숏크리트 포설 후 붙임성능이 향상되고 수화반응과정에서 수축균열이 발생하지 않는 고강도 고내구성을 가지는 고성능 습식 숏크리트 조성물을 통해 봅슬레이 경기장을 시공할 수 있는 효과가 있다.As described above, the present invention improves the construction of shotcrete, does not easily deteriorate and cracks for a long time compared to existing concrete, and has the effect of constructing bobsled stadiums through high-performance wet shotcrete composition with improved compressive strength, silica fume, expanded material and AE. It can be used to build a bobsled arena through high performance wet shotcrete composition with high pumping performance, rebound decreases during pouring, improved sticking performance after placing shotcrete, and high strength and high durability that does not cause shrinkage cracking during the hydration reaction. It has an effect.
또한 동파 및 충격에 의한 파손을 방지할 수 있는 고성능 습식 숏크리트 조성물을 통해 경기 중에 안전사고를 방지하여 경기력을 향상시킬 수 있는 봅슬레이 경기장을 시공할 수 있는 효과가 있다.In addition, through the high-performance wet shotcrete composition that can prevent breakage due to freezing and impact has the effect of installing a bobsled arena that can improve the performance by preventing safety accidents during the game.
본 발명은 비록 한정된 실시예를 도면에 의해 설명되었으나, 본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정되어 해석되어서는 아니되며, 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다. 따라서, 본 명세서에 기재된 실시예와 도면에 도시된 구성은 본 발명의 일실시예에 불과할 뿐이고 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로, 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물과 변형예들이 있을 수 있음을 이해하여야 한다.Although the present invention has been described with reference to the drawings, the terms or words used in the specification and claims are not to be construed as being limited to the conventional or dictionary meanings, and meanings consistent with the technical spirit of the present invention. It must be interpreted as a concept. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one embodiment of the present invention and do not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be variations and variations.

Claims (4)

  1. 타공이 형성된 철망거푸집을 곡선형상인 곡선측부가 지지되도록 지지대에 고정시키고, 상기 철망거푸집의 곡선측부, 바닥부 및 선단부에 복수개의 쿨링파이프를 길이방향으로 배치하며, 습식 숏크리트 조성물의 부착성 및 결속력을 강화하기 위하여 상기 쿨링파이프가 덮히도록 철근을 격자형으로 배설하여 고정하고, 상기 철근의 상부면에 곡선을 유지시키기 위한 곡선유지 파이프를 일정 간격으로 이격되게 설치하는 형틀 제작단계,The perforated wire mesh die is fixed to the support to support the curved side of the curved shape, a plurality of cooling pipes are disposed in the longitudinal direction on the curved side, the bottom and the tip of the wire mesh die, and the adhesion and binding force of the wet shotcrete composition Forming step of installing the reinforcing bar in a grid shape so as to cover the cooling pipe to reinforce, and install the curved maintenance pipe spaced at regular intervals to maintain the curve on the upper surface of the rebar,
    습식 숏크리트 조성물을 제조하고, 상기 철망거푸집의 곡선측부 및 바닥부에 상기 습식 숏크리트 조성물을 포설하는 숏크리트 포설단계,Preparing a wet shotcrete composition, and installing the wet shotcrete composition on the curved side and the bottom of the wire mesh formwork;
    스크리드 도구를 이용하여 곡선 면잡기를 실시하고, 상기 곡선유지 파이프를 제거하여 상기 습식 숏크리트 조성물이 포설된 곡선측부 및 바닥부에 미장으로 마무리하는 1차 면마무리 단계,A first surface finishing step of performing a surface grading using a screed tool, and finishing the plastering on the curved side and the bottom of the wet shotcrete composition by removing the curved holding pipe,
    상기 거칠게 면처리된 곡선측부, 바닥부 및 선단부의 표면을 얼음과의 부착이 용이하도록 거칠게 면처리하는 2차 면마무리 단계,A second surface finishing step of roughly surface-treating the surface of the roughly curved surface portion, the bottom portion and the front end portion so as to easily adhere to the ice;
    상기 습식 숏크리트 조성물이 포설된 곡선측부 및 바닥부의 표면에 살수하여 습윤양생을 하는 습윤양생단계가 포함되어 이루어지고,The wet shotcrete composition is sprinkled on the surface of the curved side and the bottom of the installation, the wet curing step is made to include a wet curing,
    상기 습식 숏크리트 조성물은, 배합전 숏크리트 80~85 부피%와 공기량 15~20 부피%가 배합되어 이루어지되, 상기 배합전 숏크리트는 배합전 숏크리트 100 중량%를 기준으로 하여 굵은골재 18~28 중량%, 잔골재 40~50 중량%, 시멘트 12~22 중량%, 물 3~13 중량%, 실리카퓸 1.4~2.4 중량%, 팽창재 1.6~2.6 중량%, 고성능 유동화제 0.01~0.1 중량% AE제 0.0001~0.01 중량%가 포함되어 이루어지고, 상기 AE제는 상기 시멘트 100 중량부에 대하여 0.0027~0.005 중량부인 것을 특징으로 하는 고성능 습식 숏크리트 조성물을 이용한 봅슬레이 경기장의 시공방법. The wet shotcrete composition is composed of 80 to 85% by volume of shotcrete and 15 to 20% by volume of air before blending, the shotcrete before mixing is 18 to 28% by weight of coarse aggregate, based on 100% by weight of shotcrete before blending, Fine aggregate 40-50% by weight, cement 12-22% by weight, water 3-13% by weight, silica fume 1.4-2.4% by weight, expander 1.6-2.6% by weight, high performance fluidizing agent 0.01-0.1% by weight AE 0.0001-0.01 weight % Is included, and the AE agent is a construction method of the bobsleigh stadium using a high performance wet shotcrete composition, characterized in that 0.0027 ~ 0.005 parts by weight based on 100 parts by weight of the cement.
  2. 청구항 1에 있어서,The method according to claim 1,
    상기 숏크리트 포설단계 후 숏크리트 포설에 의해 리바운드로 발생된 숏크리트 이물질을 제거하는 숏크리트 이물질 제거단계가 더 포함되어 이루어지는 것을 특징으로 하는 고성능 습식 숏크리트 조성물을 이용한 봅슬레이 경기장의 시공방법.Construction method of bobsleigh stadium using a high performance wet shotcrete composition, characterized in that further comprising a shotcrete foreign matter removing step of removing the shotcrete foreign matter caused by the rebounding shotcrete after the shotcrete laying step.
  3. 청구항 1 에 있어서,The method according to claim 1,
    상기 배합전 숏크리트에서 상기 시멘트, 상기 실리카퓸 및 상기 팽창재가 포함되어 이루어지는 단위 결합재는 440~480㎏/㎥인 것을 특징으로 하는 고성능 습식 숏크리트 조성물을 이용한 봅슬레이 경기장의 시공방법.The unit binder comprising the cement, the silica fume and the expandable material in the shotcrete before mixing is 440 ~ 480 kg / ㎥ The method of construction of the bobsled stadium using the high performance wet shotcrete composition.
  4. 청구항 1에 있어서,The method according to claim 1,
    상기 숏크리트 포설단계에서, 상기 포설된 습식 숏크리트 조성물은 상기 철망거푸집의 바닥부, 곡선측부 및 선단부에 스며들어 상기 철망거푸집과 함께 일체화되어 이루어지는 것을 특징으로 하는 고성능 습식 숏크리트 조성물을 이용한 봅슬레이 경기장의 시공방법.In the shotcrete laying step, the installed wet shotcrete composition penetrates the bottom, the curved side and the tip of the iron mesh formwork is integrated with the iron mesh formwork construction method of bobsled stadium using the high performance wet shotcrete composition .
PCT/KR2012/007787 2011-10-28 2012-09-27 Method for constructing a bobsleigh course using a high-performance wet-type shotcrete composition WO2013062244A1 (en)

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