阅读说明：本技术 可控导裂缝的大直径料仓及大直径料仓的裂缝控导方法 (Large-diameter bin capable of controlling crack guiding and crack guiding method of large-diameter bin ) 是由 赵顺波 陈震 杨亚彬 付振岐 李晓克 于 2020-04-17 设计创作，主要内容包括：本发明公开一种可控导裂缝的大直径料仓及大直径料仓的裂缝控导方法,该大直径料仓包括料仓,料仓的仓壁为钢筋混凝土结构,钢筋混凝土结构内嵌设钢筋笼,所述钢筋笼由竖向钢筋和环向钢筋Ⅰ固定而成,在环向钢筋Ⅰ上套设有套管,套管的两端为密封结构,钢筋笼及套管嵌设在混凝土仓壁内。本发明通过在钢筋笼的环向钢筋Ⅰ的指定位置处安放套管,使得这一段钢筋与混凝土变为无粘结,使这一段的连接相对弱化。让裂缝主要发生在套管安放的位置,从而实现对裂缝产生位置的有效控制。本发明构造简单,受力明确,施工方便,可以有效控制裂缝产生的位置,便于后期维护与裂缝的修补工作,有效提高其使用年限。(The invention discloses a large-diameter bin capable of controlling crack guiding and a crack control method of the large-diameter bin. The sleeve is arranged at the specified position of the circumferential steel bar I of the steel bar cage, so that the section of steel bar and concrete are not bonded, and the connection of the section of steel bar and concrete is relatively weakened. The cracks are mainly generated at the positions where the sleeves are placed, so that the effective control of the crack generation positions is realized. The invention has simple structure, definite stress and convenient construction, can effectively control the position of the crack, is convenient for later maintenance and repair work of the crack, and effectively improves the service life of the crack.)

1. The utility model provides a cracked major diameter feed bin is led in controllable, includes the feed bin, and the bulkhead of feed bin is reinforced concrete structure, and the embedded steel reinforcement cage of establishing of reinforced concrete structure, its characterized in that: the steel reinforcement cage is formed by vertical steel bar and the I fixed hoop steel bar, and the cover is equipped with the sleeve pipe on hoop steel bar I, and sheathed tube both ends are seal structure, and steel reinforcement cage and sleeve pipe inlay establish in the concrete bulkhead.

2. The controlled crack initiation large-diameter silo according to claim 1, wherein: buttress columns are arranged outside the wall of the silo, and sleeves are sleeved on the circumferential reinforcing steel bars I corresponding to the two adjacent buttress columns.

3. The controlled crack initiation large-diameter silo according to claim 1 or 2, characterized in that: the sleeve is a plastic bellows.

4. The controlled crack initiation large-diameter silo according to claim 1, wherein: the positions of the sleeves on the upper and lower adjacent circumferential steel bars I are consistent in the vertical direction.

5. The controlled crack initiation large-diameter silo according to claim 1, wherein: the bin wall is arranged on the base bearing platform, the two sides of the joint of the bin wall and the base bearing platform are respectively provided with an outer reinforcing armpit and an inner reinforcing armpit, and the bin wall, the base bearing platform, the outer reinforcing armpit and the inner reinforcing armpit are integrally cast and formed.

6. The controlled crack initiation large-diameter silo according to claim 1, wherein: the cross sections of the outer reinforcing armpit and the inner reinforcing armpit are triangular.

7. The controlled crack initiation large-diameter silo according to claim 1, wherein: the outer reinforced armpit and the inner reinforced armpit are both of reinforced concrete structures, each reinforced concrete structure comprises concrete and reinforcing steel bars embedded in the concrete, each reinforcing steel bar comprises an oblique reinforcing steel bar and a circumferential reinforcing steel bar II, and two ends of each oblique reinforcing steel bar respectively extend into the bin wall and the base bearing platform.

8. The controlled crack initiation large-diameter silo according to claim 6, characterized in that: the oblique reinforcing steel bars of the outer reinforcing armpit and the inner reinforcing armpit are fixed in the cabin wall in a crossed manner; the cross parts of the circumferential reinforcing steel bars II of the outer reinforcing armpit and the inner reinforcing armpit and the oblique reinforcing steel bars are connected or welded through binding.

9. The controlled crack initiation large-diameter silo according to claim 1, wherein: the length of the sleeve is 30cm, one sleeve is arranged every 2.5-3.5m, the sleeves are fixed on the circumferential steel bar I, and two ends of each sleeve are fixed in a sealing mode.

10. A crack control method for a large-diameter storage bin is characterized by comprising the following steps: crack control is performed by using a large straight bin capable of controlling crack control according to any one of claims 1-9.

Technical Field

The invention belongs to the technical field of storage, and particularly relates to a crack control and guide technology for a large-diameter reinforced concrete silo.

Background

With the rapid development of economy in China and the continuous expansion of industrial production scale, reinforced concrete silos are widely applied in more and more fields. The large-diameter silo has the advantages of large storage capacity, small occupied area, simple construction process and the like, and is widely applied to the industries of mineral transportation, grain storage and the like. The stress performance and deformation characteristics of the silo wall of the large-diameter silo structure under the action of storage load and temperature are very complex, and particularly the silo wall is subjected to great circumferential tension under the actions of outside air temperature change, illumination radiation, storage horizontal pressure and the like for a long time, so that the silo wall is damaged in different degrees, even the silo body is broken, and the durability and the service life of silo engineering are directly influenced.

The cracks of the silo are divided into construction-period cracks and service-period cracks according to the generation time. The cracks in the construction period are concrete cracks caused by the fact that the volume is relatively reduced due to hydration reaction in the initial setting or hardening process of the concrete, namely the concrete cracks caused by self-contraction deformation.

The concrete material parameters are shown in the table 1-1, and the values of the physical and mechanical parameters of the steel bars and the concrete are shown in the table 1-2.

TABLE 1-1 concrete Material parameter Table

TABLE 1-2 values of physical and mechanical parameters of steel, soil and concrete

And (4) checking calculation of crack development in the construction period.

According to the experimental study of the relevant scholars on the concrete under the standard curing condition, a calculation formula of the concrete based on the hydration degree and the self-shrinkage of the concrete in different ages is deduced, namely

In the formula (I), the compound is shown in the specification,

is the deformation based on the hydration degree and the curing age of the concrete;

is the final deformation value;

equivalent age hydration;a、bis a constant.

And taking the silo between a certain section of buttress column as a research object, and investigating the crack development conditions of different curing ages in the silo curing process. In the calculation of concrete shrinkage deformation, take，The calculation results are shown in the figure.

Development process

By comparing the hydration temperatures of the inner surface and the outer surface of the silo, the self-contraction deformation of the inner surface and the outer surface of the silo structure can be found to have obvious difference. The early concrete has high hydration degree, so that a large amount of heat is generated in the structure, the temperature is high, the crack development is fast, the temperature reaches the maximum at the age of about 20d, a small amount of heat is still released along with the increase of the maintenance age, and the influence of the structure deformation is small.

And the silo is difficult to guarantee that its inside storage is evenly distributed in the use, and the heat conductivity of concrete itself is poor in addition, makes the structure be in different temperature states inside and outside. Therefore, no effective method for controlling the cracks of the large-diameter silo is available at present.

The check calculation is carried out on service life cracks.

Generally, most internal stacking varieties are coal, and the lateral pressure coefficient of the coal to the bin wall is 0.46; volume weight of coal gamma =10kN/m³. The effect graph of full-bin coal piling in the circular stockyard is shown in figure 8,

FIG. 8 is a diagram of the effect of coal piling in a full bunker in a circular stockyard

And the computing result precision is effectively ensured by adopting the universal finite element analysis software ABAQUS with the international leading level. The silo between a certain section of buttress column is selected as a research object, the stress peak value of the silo wall is shown in a table 2-1, and the concrete stress cloud is shown in a table 8.

TABLE 2-1 Bin wall concrete stress Peak Table (MPa)

FIG. 8 is a cloud of circumferential stress of the wall of the bin

As can be seen from table 2-1 and fig. 9 and 10, the stress value of the silo lower part is much greater than that of the silo upper part, and the stress value is also a position where cracks are easily generated.

Disclosure of Invention

Although it is not practical to completely eliminate cracks of the large-diameter reinforced concrete silo, corresponding technical measures are taken according to specific conditions to prevent structural damage and effectively control the generation position of the cracks, so that the cracks can be controlled at a specific certain position of the silo, observation and repair of the cracks in the service life are facilitated, and the realization is still realized.

The invention aims to provide a large-diameter storage bin capable of controlling crack guiding, wherein a sleeve is arranged at a specified position of a circumferential steel bar I of a steel bar cage, so that the section of the steel bar and concrete are not bonded, and the connection of the section of the steel bar and the concrete is relatively weakened. The cracks are mainly generated at the positions where the sleeves are placed, so that the effective control of the crack generation positions is realized.

The object of the invention is achieved in the following way:

the utility model provides a cracked major diameter feed bin is led in controllable, includes the feed bin, and the bulkhead of feed bin is reinforced concrete structure, and the embedded steel reinforcement cage of establishing of reinforced concrete structure, the steel reinforcement cage is formed by vertical reinforcing bar and I fixed hoop reinforcing bar, and the cover is equipped with the sleeve pipe on hoop reinforcing bar I, and the sheathed tube both ends are seal structure, and steel reinforcement cage and sleeve pipe inlay and establish in the concrete bulkhead.

According to the large-diameter bin with the controllable guide cracks, the plurality of buttress columns are arranged outside the bin wall, and sleeves are sleeved on the circumferential reinforcing steel bars I corresponding to the two adjacent buttress columns.

The controllable crack guide large-diameter storage bin is characterized in that the sleeve is a plastic corrugated pipe.

According to the large-diameter bin with the controllable crack guide, the positions of the plastic corrugated pipes on the upper and lower adjacent circumferential reinforcing steel bars I are consistent in the vertical direction.

Above-mentioned fissured major diameter feed bin is led in controllable, the bulkhead sets up on the base cushion cap, the bulkhead sets up outer enhancement armpit and interior enhancement armpit respectively with the both sides of base cushion cap junction, bulkhead, base cushion cap, outer enhancement armpit and interior enhancement armpit are the shaping of pouring as an organic whole.

According to the large-diameter bin with the controllable crack guide, the sections of the outer reinforcing armpit and the inner reinforcing armpit are triangular.

Above-mentioned fissured major diameter feed bin is led in controllable, strengthen the armpit outward and strengthen the armpit in with and be reinforced concrete structure, reinforced concrete structure includes the concrete and inlays the reinforcing bar of establishing in the concrete, and the reinforcing bar includes slant reinforcing bar and hoop reinforcing bar II, and the both ends of slant reinforcing bar stretch into respectively in the bulkhead and the base cushion cap in.

In the large-diameter bin with the controllable crack, the oblique reinforcing steel bars of the outer reinforcing armpit and the inner reinforcing armpit are fixed in the bin wall in a crossed manner.

Above-mentioned controllable big diameter feed bin that leads crack, the hoop reinforcing bar II and the slant reinforcing bar cross section of outer enhancement armpit and interior enhancement armpit pass through binding connection or welding.

According to the large-diameter storage bin with the controllable crack guide function, the length of each sleeve is 30cm, each sleeve is arranged at intervals of 2.5-3.5m, each sleeve is fixed on the corresponding annular steel bar I, and two ends of each sleeve are fixed in a sealing mode.

Above-mentioned controllable cracked major diameter feed bin of leading, the bulkhead top is provided with the top ring beam, is provided with prefabricated pile foundation below the base cushion cap, prefabricated pile foundation, base cushion cap, bulkhead and outer reinforcement armpit and interior reinforcement armpit structure of pouring as an organic whole.

A crack control and guide method for a large-diameter bin adopts the large straight bin with the controllable crack to control and guide the crack.

By adopting the technical scheme, the invention has the beneficial effects that:

the sleeve is arranged at the specified position of the circumferential steel bar I of the steel bar cage, so that the section of steel bar and concrete are not bonded, and the connection of the section of steel bar and concrete is relatively weakened. The cracks are mainly generated at the positions where the sleeves are placed, so that the effective control of the crack generation positions is realized.

The invention has simple structure, definite stress and convenient construction, can effectively control the position of the crack, is convenient for later maintenance and repair work of the crack, and effectively improves the service life of the crack.

Drawings

Figure 1 is a cross-sectional view of the present invention.

FIG. 2 is a longitudinal cross-sectional view of the wall of the inventive silo.

Fig. 3 is an enlarged view of the area a in fig. 2.

FIG. 4 is a schematic diagram of the fracture zone configuration after use in accordance with the present invention.

Fig. 5 is a schematic structural view of the reinforcement cage and the sleeve of the present invention.

Fig. 6 is a diagram of the development process of the temperature of the concrete inside and outside the storage bin in the prior art.

Fig. 7 is a diagram of the development process of self-contraction of concrete inside and outside a storage bin in the prior art.

FIG. 8 is a concrete stress cloud diagram after coal piling in a full bunker in the existing circular stockyard.

FIG. 9 illustrates a circumferential stress cloud under the existing silo wall conditions.

FIG. 10 is a diagram of two circumferential stress clouds in the wall of a conventional silo.

Detailed Description

As shown in fig. 1 to 3, controllable crack major diameter feed bin that leads, including the feed bin, the bulkhead 1 of feed bin is reinforced concrete structure, the embedded steel reinforcement cage of establishing of reinforced concrete structure, the steel reinforcement cage is formed by vertical reinforcement 9 and the fixed I10 of hoop reinforcing bar, and the cover is equipped with sleeve pipe 11 on hoop reinforcing bar I, and sheathed tube both ends are seal structure, and steel reinforcement cage and sleeve pipe inlay establish in the concrete bulkhead.

A plurality of buttress columns 4 are arranged outside the wall of the silo, and sleeves are sleeved on the circumferential reinforcing steel bars I corresponding to two adjacent buttress columns.

The sleeve of the present invention is a plastic corrugated tube. The plastic corrugated pipe is fixed and the two ends of the plastic corrugated pipe are sealed when the vertical steel bars and the annular steel bars of the steel reinforcement cage are bound by I, so that the plastic corrugated pipe is prevented from moving and concrete grout can not flow in during grouting. In this way, direct contact of the steel reinforcement with the concrete is avoided. The good plasticity of the plastic corrugated pipe is utilized, so that the cracks are intensively generated at the position where the plastic corrugated pipe is arranged.

The positions of the plastic corrugated pipes on the upper and lower adjacent annular reinforcing steel bars I are consistent in the vertical direction. The positions of the plastic corrugated pipes of the whole structure are consistent up and down. The crack that makes the concrete can develop along plastic corrugated pipe's position, and the cracked observation of later stage of being convenient for is done the cracked maintenance work of feed bin at construction and later stage operation in-process, guarantees the normal operation of feed bin.

The bin wall is arranged on a base bearing platform 2, an outer reinforcing armpit 5 and an inner reinforcing armpit 6 are respectively arranged on two sides of the connection part of the bin wall and the base bearing platform, and a top ring beam 12 is arranged at the top of the bin wall. The prefabricated pile foundation is arranged below the base bearing platform, and the prefabricated pile foundation 3, the base bearing platform 2, the bin wall 1, the outer reinforcing armpit 5 and the inner reinforcing armpit 6 are of an integral pouring structure.

The bin wall, the base bearing platform, the outer reinforcing armpit and the inner reinforcing armpit are of an integrally cast structure, so that the overall strength is greatly improved.

According to the large-diameter storage bin with the controllable crack, the sections of the outer reinforcing armpit and the inner reinforcing armpit are triangular, the outer reinforcing armpit and the inner reinforcing armpit are both of reinforced concrete structures, each reinforced concrete structure comprises concrete and reinforcing steel bars embedded in the concrete, each reinforcing steel bar comprises an oblique reinforcing steel bar 7 and a circumferential reinforcing steel bar II 8, two ends of each oblique reinforcing steel bar respectively extend into the bin wall and the base bearing platform, and the oblique reinforcing steel bars and the circumferential reinforcing steel bars II are uniformly arranged inside and outside the bin wall. The oblique reinforcing steel bars of the outer reinforcing armpit and the inner reinforcing armpit are fixed in the cabin wall in a crossed mode. The cross parts of the circumferential reinforcing steel bars II of the outer reinforcing armpit and the inner reinforcing armpit and the oblique reinforcing steel bars are connected or welded through binding.

According to the large-diameter storage bin with the controllable crack, during experiments, the length of the sleeve is 30cm, one sleeve is arranged every 2.5-3.5m, the sleeves are fixed on the annular steel bar I, and two ends of each sleeve are fixed in a sealing mode.

A crack control and guide method for a large-diameter storage bin comprises the following specific steps: before the reinforcing steel bars are bound, plastic corrugated pipes are sleeved on the circumferential reinforcing steel bars I between the buttress columns 4, the length of each corrugated pipe is 30cm, and the corrugated pipes are arranged every 3m or so. The sleeve is fixed during steel bar binding, and two ends of the sleeve are sealed, so that the sleeve is prevented from moving and concrete slurry is prevented from flowing in during grouting. In this way, direct contact of the steel reinforcement with the concrete 13 is avoided. The good plasticity of the plastic corrugated pipe is utilized, so that the cracks are intensively generated at the position where the sleeve is arranged.

In addition, the position of the sleeve in the whole structure should be consistent up and down. The crack of the concrete can be developed along the position of the sleeve, so that the crack can be observed in the later period conveniently, the maintenance work of the crack of the silo is well done in the construction and later period operation processes, and the normal operation of the silo is ensured.

The invention has simple structure, definite stress and convenient construction, can effectively control the position of the crack, is convenient for later maintenance and repair work of the crack, and effectively improves the service life of the crack.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicability of the patent.