CN212358852U - Novel concrete combination post - Google Patents
Novel concrete combination post Download PDFInfo
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- CN212358852U CN212358852U CN202020455851.6U CN202020455851U CN212358852U CN 212358852 U CN212358852 U CN 212358852U CN 202020455851 U CN202020455851 U CN 202020455851U CN 212358852 U CN212358852 U CN 212358852U
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Abstract
The utility model discloses a novel concrete combination post. The novel concrete combined column is divided into an inner layer and an outer layer, the outer layer is made of ultra-high performance concrete (1), the inner layer is made of common concrete or recycled concrete (2), and a reinforcement cage consisting of longitudinal reinforcements (3) and stirrups (4) is arranged in the inner layer of reinforced concrete. The utility model discloses a transverse connection reinforcing bar (5) and other connected modes combine outer ultra high performance concrete and inlayer reinforced concrete effectively, establish a neotype concrete combination post that has ultra high durability, and have good atress performance and wholeness. The novel concrete composite column is convenient in preparation process, and can be widely applied to various severe conditions and used as a main bearing member. The inner layer uses common concrete or recycled concrete, thereby avoiding excessive use of ultra-high performance concrete and reducing cost.
Description
Technical Field
The utility model belongs to the technical field of building material, in particular to novel concrete combination post and construction method thereof.
Background
In the construction of houses and bridges, reinforced concrete columns are generally used as load-bearing elements. The strength, porosity, high temperature resistance, weathering corrosion resistance and other properties of the materials used for the bearing column can have great influence on the performance of the whole structure. At present, the reinforced concrete column mainly has the following defects: 1. self-weight. The gravity density of the reinforced concrete is about 25kN/m3And is heavier than both masonry and wood. Although less heavy than steel, the cross-sectional dimensions of the structure are large, and thus its own weight far exceeds the weight of a steel structure of the same span or height. 2. The crack resistance is poor. The tensile strength of concrete is very low, and therefore, ordinary reinforced concrete structures often work with cracks. Although the presence of cracks does not necessarily mean that the structure is damaged, it affects the durability and aesthetics of the structure. When the number of cracks is large and the width of the cracks is wide, an unsafe feeling is also brought to people. 3. The durability is poor. The concrete column at the seaside is corroded by seawater and sea humid air for a long time, the reinforced concrete is corroded, and the corrosion resistance and the safety are reduced sharply.
In the current engineering construction, the reinforced concrete column still adopts the traditional process, the time and the labor are consumed, the later maintenance cost is relatively high, the common concrete is directly exposed in the air after the form removal, and due to the influences of concrete shrinkage, concrete materials and proportion, improper construction site measures, uneven settlement of a structure foundation, acid, alkali, salt and the like in the surrounding environment of the climate, the problems of cracks, corrosion and the like can be caused on the surface of the concrete, the uncertain factors for constructing the bearing capacity are increased, so that the mechanical property, the durability and the bearing capacity of the concrete support column can not reach the expected effect, and the normal use function of the engineering is seriously influenced. The later maintenance difficulty is big, and the expense is high to need supervise at any time and maintain, manpower and materials all invest considerably, the service life also needs to improve.
In recent years, people improve the structure of the reinforced concrete column, and various combined structure forms appear, but all have shortcomings. The composite structure mainly comprises FRP (fiber reinforced plastic) constraint concrete and steel pipe concrete, which can effectively improve the strength and ductility of a reinforced concrete column, but the defects are still obvious. The defects of the two combined structures are mainly expressed as follows: 1. both of the two are the combination of concrete and other materials, peeling is easy to occur at the combination position, the durability is reduced, and the construction and the later maintenance are relatively difficult; 2. both of these processes are relatively complex. The steel pipe concrete construction comprises the complicated steps of cleaning a steel pipe column, installing a guide pipe, ultrasonically detecting concrete in the pipe column and the like, the FRP constraint concrete also comprises the complex processes of cement surface treatment, priming coating, deposition coating and the like, and compared with the defects, the defects can be avoided by using the ultrahigh-performance concrete.
With the increasing requirements on building technology and buildings, novel building materials are gradually produced, and since the appearance of ultra-high performance concrete, the ultra-high performance concrete draws wide attention at home and abroad, and a plurality of researches are also carried out on how to better apply the ultra-high performance concrete to building construction.
Ultra-High Performance Concrete (UHPC) was first developed in the 90 s of the 20 th century by the company Bouygues, france, and its excellence was mainly shown in the following areas: ultrahigh mechanical property; ultra-high durability; excellent wear resistance and antiknock performance.
The compressive strength of the existing ultra-high performance concrete can reach 200MPa to 800MPa, the highest tensile strength can reach 200MPa, and the elastic modulus is between 40GPa and 60 GPa. The fracture toughness of the UHPC doped with the superfine steel fiber is as high as 40000J/m2, which is 250 times of that of common concrete and can be compared favorably with metal aluminum. The ratio of the bending strength to the self weight of the prestressed ultra-high performance concrete beam is close to that of a steel beam. UHPC has very little porosity and therefore very good resistance to chloride ion penetration and freezing. 1/25 whose chloride ion permeability is that of high strength concrete; after 300 rapid freeze-thaw cycles, the samples were not damaged and the durability factor was as high as 100%.
Because the development period of the ultra-high performance concrete is short, the technology is new, and the price is expensive, about 4000-00 yuan per ton and about 500 yuan per ton of common commercial concrete can be seen, the price of the ultra-high performance concrete is about 10-30 times of that of the common concrete, and therefore, if the reinforced concrete column completely uses the ultra-high performance concrete, the cost is very high, and the economic requirement is difficult to meet.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem lie in: to the dead weight that exists in the above-mentioned concrete column big, anti crack resistance can be poor, the poor scheduling problem of durability, the utility model provides a can alleviate effective dead weight, improve anti crack resistance can, promote durability, the good and convenient to construct novel concrete combination post of wholeness.
To achieve the above object, the present invention provides a solution: the utility model provides a novel concrete combination post, includes ultra high performance concrete (1), arranges wire net or steel fibre net in ultra high performance concrete (1), ordinary concrete or recycled concrete (2), arranges the steel reinforcement cage of being assembled into by indulging muscle (3) and stirrup (4) in ordinary concrete or recycled concrete (2) in, and the connected mode between ultra high performance concrete (1) and ordinary concrete or recycled concrete (2) has: and after the transverse connecting steel bars (5) lapped on the steel reinforcement cage and the common concrete or the recycled concrete (2) are poured and maintained, roughening the outer wall, smearing an interface agent, and spraying punctiform cement mortar on the outer wall of the common concrete or the recycled concrete (2), wherein one part of the connecting steel bars are arranged in the ultra-high performance concrete (1), and the other part of the connecting steel bars are arranged in the common concrete or the recycled concrete (2).
Furthermore, the ultra-high performance concrete (1) has ultra-high durability and ultra-high mechanical property, and the compressive strength is more than 150 MPa.
Further, the common concrete or recycled concrete (2) outer wall roughening method comprises an artificial roughening method and a mechanical roughening method.
Furthermore, the interface agent coated on the outer wall of the common concrete or the recycled concrete (2) comprises a dry powder type interface agent and an emulsion type interface agent.
Furthermore, the reinforcement cage in the common concrete or the recycled concrete (2) comprises stirrups (4) and longitudinal reinforcements (3) which are uniformly arranged along the stirrups.
Further, the transverse connecting steel bars (5) comprise engineering common steel bars with various strength models.
The application has the advantages that:
one, the utility model discloses effectively utilized the durability of ultra high performance concrete superelevation:
1) has ultrahigh chlorine ion permeability resistance. Because the diffusion coefficient of chloride ions of the ultra-high performance concrete is very low and is only 10% -30% of that of common concrete, the outer layer of the ultra-high performance concrete can well protect the inner layer of reinforced concrete.
2) The lower capillary porosity of the ultra-high performance concrete makes harmful media difficult to invade into the concrete, the total porosity is reduced by about 40 percent compared with the common concrete, and the inner layer reinforced concrete is effectively protected.
3) Experiments show that the ultrahigh-performance concrete has good carbonization resistance. The outer ultra-high performance concrete is used as a protective layer, so that the corrosion of the steel bars can be effectively inhibited, and the service life of the concrete is prolonged.
4) Has excellent antifreezing performance. Under the condition of not doping an air entraining agent, the ultra-high performance concrete can still meet the requirement of frost resistance of the concrete in cold regions.
Two, the utility model discloses effectively utilized the mechanical properties of ultra-high performance concrete superelevation:
1) the compressive strength of the ultra-high performance concrete can reach 200-800MPa, the breaking strength can reach 70-150MPa, the stress performance is far better than that of common concrete, and the stress performance of the integral concrete combination column is improved.
2) The ultrahigh-performance concrete has good crack resistance, the outer layer of the ultrahigh-performance concrete has good tensile performance, and cracks of the concrete structure are reduced, so that the concrete structure is safer and more attractive.
3) The ultra-high performance concrete is utilized, and the anti-fatigue capability of the concrete combined column is effectively improved.
4) The ultra-high performance concrete is used, the strength requirement is met, and meanwhile, the volume of the concrete structure is reduced to a certain extent, so that the self weight of the concrete structure is reduced.
And the ultrahigh-performance concrete is similar to the common concrete in composition material, and is tightly bonded by using the connection methods of an interface agent, roughening, transverse connecting reinforcing steel bars and the like, so that the ultrahigh-performance concrete is strong in integrity and not easy to peel.
And fourthly, the ultrahigh-performance concrete is reasonably used, so that the excessive use of the ultrahigh-performance concrete is avoided while the performances of the concrete column are improved, the consumption of the concrete is reduced, and the economic benefit is remarkable.
To sum up, the utility model discloses because its good durability can lie in the wide use under the various natural condition, and the atress performance is good, and the structure wholly combines closely, and economic benefits is showing, and the application prospect is wide.
Drawings
Figure 1 is an axial view of the effect of the present invention
FIG. 2 is a cross-sectional view of the present invention
FIG. 3 is an axonometric view of the construction template of the utility model
FIG. 4 and FIG. 5 show the steel bar effect diagram of the construction process
FIG. 6 is an isometric view of the inner layer reinforced concrete of the present invention
Wherein, 1-ultra high performance concrete, 2-common concrete or recycled concrete, 3-longitudinal bar, 4-stirrup, 5-transverse connecting bar, 6-interface, 7-inner jointed board, 8-outer jointed board, 9-column hoop, 10-cleaning hole, 11-wood frame, 12-cover board, 13-tension bolt, 14-jointed strip
Detailed Description
The following description of the present invention is made by way of specific examples.
Example 1:
referring to fig. 1 and 2, a novel concrete composite column comprises a reinforcement cage assembled by longitudinal bars (3) and stirrups (4), transverse connecting reinforcements (5) are lapped on the reinforcement cage according to the design, the transverse connecting reinforcements (5) exceeding the inner common concrete part are adjusted to be vertical according to fig. 4, the reinforcements are placed in a wood formwork for pouring and building common concrete or recycled concrete (2), maintenance and formwork removal are carried out, the longitudinal parts of the connecting reinforcements are adjusted to be horizontal again according to fig. 5, and finally, the novel concrete composite column is formed by spraying ultrahigh-performance concrete (1).
The novel concrete combined column construction method sequentially comprises the following steps of:
(a) preparation work: transporting the ultra-high performance concrete (1), the common concrete or the recycled concrete (2) to a pouring place; and cleaning a construction site, well performing drainage work, and arranging a construction machine in place.
(b) Assembling the steel bars: as shown in fig. 4, a reinforcement cage is assembled by 8 longitudinal bars (3) with 12mm diameter and 10 stirrups (4) with 8mm diameter, each stirrup is square, the side length is 250mm, the distance is 200mm, 8 transverse connecting reinforcements (5) with 6mm diameter and 50mm length are uniformly arranged along the length and width direction of the reinforcement cage, and the transverse connecting reinforcements are uniformly arranged at 400mm intervals along the height.
(c) And (3) formwork support: referring to fig. 3, the wooden form is installed according to the designed inner layer concrete size, two inner jointed boards (7) of the form are clamped between two outer jointed boards (8), wooden, steel or steel column hoops (9) are arranged outside the jointed boards, and cleaning holes are arranged at the bottom of the jointed boards.
(d) Arranging ribs: referring to fig. 4, fig. 5, the transverse connecting bars (5) having a length of 25mm beyond the inner concrete portion are adjusted to the longitudinal direction, and the entire bars are placed in the form and fixed.
(e) Manufacturing an inner layer of the combined column: pouring cement mortar or cement paste with the thickness of 50mm and the same components as the mortar in the poured concrete at the bottom of the column, then pouring common concrete or recycled concrete (2) with corresponding strength, vibrating, performing standard maintenance for 28 days, removing the template, as shown in figure 5, readjusting 25mm longitudinal parts of each connecting steel bar to be transverse so that the connecting steel bars extend out of the outer wall of the inner layer concrete, and as shown in figure 6, smearing an interface agent on the outer wall.
(f) Manufacturing an outer layer of the combined column: the method is characterized in that a sprayed concrete construction mode is adopted, the ultra-high performance concrete (1) is fed into a concrete wet spraying machine, a low-lying part is approximately filled and leveled during spraying, then layering is carried out sequentially from bottom to top, spraying is carried out in a reciprocating mode until the thickness reaches 50mm, after the sprayed concrete is finally set for 2 hours, curing is carried out in time by using a curing liquid, and the curing time is 15 days.
Example 2:
the utility model discloses in, the selection of inlayer ordinary concrete in outer ultra high performance concrete connected mode can be different according to concrete construction conditions, and this embodiment just provides a more simple and convenient construction mode that need not the transverse connection reinforcing bar:
(g) preparation work: transporting the ultra-high performance concrete (1), the common concrete or the recycled concrete (2) to a pouring place; and cleaning a construction site, well performing drainage work, and arranging a construction machine in place.
(h) Assembling the steel bars: 8 longitudinal bars (3) with the diameter of 12mm and 10 stirrups (4) with the diameter of 8mm are assembled into a reinforcement cage, the stirrups are square, the side length is 250mm, and the distance is 200 mm.
(i) And (3) formwork support: referring to fig. 3, the wooden form is installed according to the designed inner layer concrete size, two inner jointed boards (7) of the form are clamped between two outer jointed boards (8), wooden, steel or steel column hoops (9) are arranged outside the jointed boards, and cleaning holes are arranged at the bottom of the jointed boards.
(j) Manufacturing an inner layer of the combined column: placing the reinforcement cage in a template, pouring cement mortar or cement paste with the thickness of 50mm and the same components as the mortar in the poured concrete at the bottom of the column, then pouring common concrete or recycled concrete (2) with corresponding strength, vibrating, performing standard maintenance for 28 days, removing the template,
(k) interface treatment: and smearing an interface agent on the outer wall of the inner layer of reinforced concrete, and then irregularly spraying cement mortar to the outer wall to ensure that the outer wall of the concrete is covered with the dotted cement mortar.
(l) Manufacturing an outer layer of the combined column: the method is characterized in that a sprayed concrete construction mode is adopted, the ultra-high performance concrete (1) is fed into a concrete wet spraying machine, a low-lying part is approximately filled and leveled during spraying, then layering is carried out sequentially from bottom to top, spraying is carried out in a reciprocating mode until the thickness reaches 50mm, after the sprayed concrete is finally set for 2 hours, curing is carried out in time by using a curing liquid, and the curing time is 15 days.
The above drawings and embodiments are only for illustrating the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereto, and those skilled in the art should be able to make general changes and substitutions within the scope of the present invention.
Claims (6)
1. The utility model provides a novel concrete combination post which characterized in that: including ultra high performance concrete (1), ordinary concrete or recycled concrete (2), arrange the steel reinforcement cage of assembling by indulging muscle (3) and stirrup (4) in ordinary concrete or recycled concrete (2) in, the connected mode between outer concrete and the inner concrete has: and after the transverse connecting steel bars (5) lapped on the steel reinforcement cage and the common concrete or the recycled concrete (2) are poured and maintained, roughening the outer wall, smearing an interface agent, and spraying punctiform cement mortar on the outer wall of the common concrete or the recycled concrete (2), wherein one part of the connecting steel bars are arranged in the ultra-high performance concrete (1), and the other part of the connecting steel bars are arranged in the common concrete or the recycled concrete (2).
2. The new concrete composite post according to claim 1, characterized in that: the common concrete or the recycled concrete (2) is common concrete or recycled concrete with various strengths.
3. The new concrete composite post according to claim 1, characterized in that: the interface agent (6) coated on the outer wall of the common concrete or the recycled concrete (2) comprises a dry powder type interface agent and an emulsion type interface agent.
4. The new concrete composite post according to claim 1, characterized in that: the common concrete or recycled concrete (2) outer wall roughening method comprises an artificial roughening method and a mechanical roughening method.
5. The new concrete composite post according to claim 1, characterized in that: the transverse connecting steel bars (5) comprise engineering common steel bars with various strength models.
6. The new concrete composite post according to claim 1, characterized in that: the reinforcement cage arranged in the common concrete or the recycled concrete (2) comprises stirrups (4) and longitudinal reinforcements (3) uniformly arranged along the stirrups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020455851.6U CN212358852U (en) | 2020-04-01 | 2020-04-01 | Novel concrete combination post |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020455851.6U CN212358852U (en) | 2020-04-01 | 2020-04-01 | Novel concrete combination post |
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| CN212358852U true CN212358852U (en) | 2021-01-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113293930A (en) * | 2021-05-20 | 2021-08-24 | 武汉大学 | UHPC pipe restraint recycled concrete post externally pasted with FRP cloth |
| TWI743003B (en) * | 2021-02-24 | 2021-10-11 | 潤弘精密工程事業股份有限公司 | Rebar cage |
| CN113818334A (en) * | 2021-09-22 | 2021-12-21 | 湖南大学 | Prefabricated UHPC formwork core-filling concrete pier with framework and construction method thereof |
-
2020
- 2020-04-01 CN CN202020455851.6U patent/CN212358852U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI743003B (en) * | 2021-02-24 | 2021-10-11 | 潤弘精密工程事業股份有限公司 | Rebar cage |
| CN113293930A (en) * | 2021-05-20 | 2021-08-24 | 武汉大学 | UHPC pipe restraint recycled concrete post externally pasted with FRP cloth |
| CN113818334A (en) * | 2021-09-22 | 2021-12-21 | 湖南大学 | Prefabricated UHPC formwork core-filling concrete pier with framework and construction method thereof |
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