CN201943259U

CN201943259U - Casing reinforced concrete column

Info

Publication number: CN201943259U
Application number: CN2011200588710U
Authority: CN
Inventors: 单波; 肖岩; 龚建清
Original assignee: Hunan University
Current assignee: Hunan University
Priority date: 2011-03-09
Filing date: 2011-03-09
Publication date: 2011-08-24
Anticipated expiration: 2021-03-09

Abstract

The utility model discloses a casing reinforced concrete column, which is characterized in that a casing (1) of the reinforced concrete column (2) is a prefabricated active powder concrete casing. The utility model has the characteristics of convenient construction, low cost, high axial bearing capacity, good earthquake resistance, outstanding fire resistance, excellent durability and the like, and simultaneously, resources and energy are saved, so that the requirements of sustainable development can be met.

Description

A kind of sleeve pipe reinforced concrete post

Technical field

The utility model is mainly concerned with the building structure field in the civil engineering, refers in particular to a kind of sleeve pipe reinforced concrete post that structural column uses of doing.

Background technology

Progress and sustainable development of economy along with society, the modern architecture industry is also more and more higher to the requirement of constructional materials and building structure, material and structure must be able to adapt to the modern project structure to stride greatly, towering, heavy duty development and satisfy the demand of bearing abominable environment for use and durability, meet modern construction technology industrial requirement, and have high weight capacity, good deformability, performance/expense ratio that fire resistance is good and good.In 30 years, the appearance of advanced composite material (ACM) and combining structure and development have greatly promoted the development of builing industry in the past.Wherein, high performance concrete and concrete filled steel tube are the most representative undoubtedly.

In the future that can estimate, cement concrete will remain topmost constructional materials, can not be substituted.From this angle, the sustainable development of builing industry and concrete performance and durability are closely related.Just concrete must satisfy development of social economy with the material consumption and the ambient influnence of minimum.In this respect, the development of ultra-high performance concrete is undoubtedly most promising solution.

RPC is a kind of novel concrete based composites with superelevation compressive strength, high-durability and high tenacity.RPC has two grade of compressive strength of 200MPa or 800MPa as the novel ultra-high performance concrete of a class, and flexural strength has effectively overcome the high fragility of high performance concrete, the performance brilliance at 30～60MPa.Wherein, the RPC technology and the ordinary concrete of 200MPa strength grade are similar, and application prospect is extensive.

RPC has superhigh intensity, the durability of excellence and good ductility and energy dissipation capacity.These excellent performances make RPC member and structure have very high intensity/from anharmonic ratio, outstanding durability and good seismic resistance.As a kind of High Technique Concrete, at present, the principal element that hinders the RPC extensive application has two: first is that the folk prescription material cost is higher.The cement consumption of RPC is big, also needs simultaneously to mix high efficiency water reducing agent and steel fibre etc., has increased material cost; Another is that member need carry out thermal curing.The high activity of RPC material must be under certain curing temperature could be fast, give full play to, studies show that, RPC maintenance 48h in 90 ℃ hot water, its compressive strength rate standard curing 28d improves more than 30%.Therefore, under existence conditions, RPC should be a mode with prefabricated units in field of civil engineering, form combined member with other materials, give full play to the compressive property of its superelevation and good ductility, can consider in reasonably position replacement steel use, thereby the intensity/expense that embodies RPC compares advantage.

With the steel core concrete column is the confined concrete structure of representative, in nearly in the past 50 years, has obtained further investigation and extensive use.Steel core concrete column is at the steel duct fill concrete, forms the steel-concrete coupled column.The basic principle of this coupled column is to utilize steel pipe to provide lateral restraint to the core space concrete, makes concrete be in the stress state of three dimension stress, thereby improves the ability of its compressive strength and compressive strain.In addition, inner concrete of filling provides supporting role for steel pipe, has strengthened the geometrical stability of steel pipe walls, has changed the unstability mode of steel pipe, has improved the supporting capacity of steel pipe, and simultaneously, inner concrete existence can improve the fire endurance of steel pipe.And in construction, steel pipe is convenient to construction as building the concrete template of core space.

At present, steel core concrete column is coming with some shortcomings aspect performance and the use, and is higher as the tube material price, the processing request height; The steel core concrete column fire resistance is relatively poor, need take other measures to improve the anti-fiery limit; Steel pipe and concrete material characteristic difference are big, cause steel pipe and concrete come to nothing etc. easily.In addition, steel core concrete column in use needs to carry out periodic maintenance, has increased use cost.Therefore, develop a kind of new casing reinforced concrete post for being badly in need of.

The utility model content

The purpose of this utility model is to provide a kind of sleeve pipe reinforced concrete post, have easy construction, characteristics such as cost is low, axial bearing capacity is high, anti-seismic performance is good, fire resistance is outstanding, endurance quality excellence, economize on resources more and the energy simultaneously, meet the requirement of sustainable development.

Solution of the present utility model is a kind of sleeve pipe reinforced concrete post, and the sleeve pipe that it is characterized in that reinforced concrete post is prefabricated RPC sleeve pipe.Like this by adopting prefabricated RPC sleeve pipe and inner reinforced concrete post to form coupled column.In work progress, the RPC sleeve pipe is inner concrete template, also is the part of construction support system; After construction was finished, sleeve pipe and inner concrete were born axial load jointly, before RPC sleeve pipe cracking, sleeve pipe with for the core space concrete provides horizontal restrain, the shaping confined concrete.Under horizontal loads, the RPC sleeve pipe rely on that self material had than high-flexural strength and shear strength, can effectively improve anti-bending strength, shear behavior and the ductility of coupled column; In use; the RPC sleeve pipe can be inner concrete provides performance very excellent topping; make coupled column have outstanding durability and fire resistance, and the RPC sleeve pipe can reduce decoration cost directly as the outer decorative layer use of post.

The utility model and steel core concrete column relatively, the RPC casing string has the performance of self, as easy construction, cost is low, axial bearing capacity is high, anti-seismic performance is good, fire resistance is outstanding, endurance quality excellence etc.Remedied the defective of existing steel core concrete column in (, fire resistance higher and endurance quality deficiency etc.) aspect some key technologies as cost, given full play to the material property of RPC simultaneously, and overcome its cost problem of higher from performance/expense efficient aspect.

Described sleeve pipe reinforced concrete post is characterized in that described RPC inside pipe casing disposes longitudinal reinforcement and stirrup.In the loading process of coupled column, the stirrup of configuration can be the core space concrete in the sleeve pipe provides effective restraint stress, improves the shear behavior and the ductility of coupled column.The longitudinal reinforcement of configuration can effectively improve the workability of sleeve pipe and the anti-bending bearing capacity of coupled column in the sleeve pipe.

Described sleeve pipe reinforced concrete post is characterized in that the reinforcing bar of configuration in the described reinforced concrete post is longitudinal reinforcement and spiral stirrup.The longitudinal reinforcement that is disposed can improve the anti-bending bearing capacity and the resistance to compression bearing capacity of coupled column.The spiral stirrup that is disposed can further strengthen the concrete effect of restraint in internal core district, can effectively improve the bearing capacity and the ductility of coupled column.

Compared with prior art, advantage of the present utility model just is:

1. the RPC sleeve pipe can significantly improve the axial bearing capacity of coupled column.The compressive strength and the steel of RPC are approaching, and unit weight and ordinary concrete basically identical, therefore, the strength/weight of RPC is much higher than steel, is about 3 times of steel.The steel pipe deadweight that RPC sleeve pipe that 50mm is thick and 16mm are thick is basic identical, that is to say that difficulty of construction can not increase, and the axial bearing capacity that sleeve pipe itself provides can improve more than 200%, and therefore, RPC casing string axial bearing capacity is higher.

2. RPC casing string fire resistance excellence.The yield strength of structural iron and modulus of elasticity rise with temperature and descend, and when temperature surpassed 550 ℃, steel were lost most of strength and stiffness.Therefore, steel core concrete column is taked the outsourcing fireproof paint in design, and perhaps configuration is special in concrete considers that the measures such as reinforcing bar of anti-fire improve fire endurance, but these measures all can significantly improve cost.The RPC casing string has outstanding fire resistance, and the processing that need not to prevent fires has the cost advantage.

3. the cost of material is low for the RPC casing string.The RPC material cost is about 3500 yuan/m ³(volume content of steel fibers is 2%) amounted to into weight and is about 1400 yuan/ton.The price of steel is above 6000 yuan/ton, the strength/weight of considering RPC is about 3 times of steel, concerns from the intensity/cost of material, for same coupled column, the material cost of RPC sleeve pipe only be steel pipe 1/10 less than.

4. the excellent in durability of RPC casing string, the operation and maintenance cost is low.RPC possesses high compact and high fluidity, makes the contact surface of itself and template have very high fineness.Simultaneously, extraneous hazardous medium is difficult to invade in the RPC, and the components such as colorant in the RPC also are difficult for outwards separating out, and can directly utilize the outer decorative layer of RPC sleeve pipe as coupled column, have cancelled the secondary decoration.In addition, the RPC sleeve pipe need not to consider the anti-corrosion problem, and its excellent endurance quality can significantly improve the life cycle of structure.

5. the ecological effect of RPC casing string is good.With 2009 be example, the specific energy consumption of China's cement and steel is respectively 95.08kg standard coal/ton and 590.08kg standard coal/ton, and unit product CO ₂The discharge value steel be 2 times of cement.The energy consumption of Unit Weight RPC and CO ₂Discharge value is respectively 1/18 and 1/6 of steel.In addition, mix industrial by-products such as silicon ash, flyash in the RPC in a large number.Therefore, the good environmental protection of RPC.

6. RPC casing string easy construction.In scantling scope commonly used, the deadweight difference of RPC sleeve pipe and steel pipe is little, the RPC sleeve pipe that is mixed with steel fibre or arrangement of reinforcement has good intensity and ductility, in producing, transport and constructing, do not have specific (special) requirements, can carry out according to the construction technology of steel core concrete column.In addition, RPC sleeve pipe and inner concrete all are cement-based materials, and deformation performance is basic identical, the problem that can effectively avoid sleeve pipe and inner concrete to come to nothing, and this is the concrete filled steel tube common quality defects encountered.

Description of drawings

Fig. 1 is the structural representation of the utility model RPC casing string;

Fig. 2 is a RPC casing string A-A schematic cross-section;

Fig. 3 is the application schematic diagram of RPC casing string 7.

Marginal data

1 is that prefabricated RPC sleeve pipe 2 is reinforced concrete post

3 is that longitudinal reinforcement 4 is stirrup in the RPC sleeve pipe in the RPC sleeve pipe

5 is that reinforced concrete post longitudinal reinforcement 6 is the reinforced concrete post spiral stirrup

7 is that RPC casing string 8 is reinforced concrete beam

The specific embodiment

The utility model as shown in drawings, the sleeve pipe that it is characterized in that reinforced concrete post 2 is prefabricated RPC sleeve pipe 1, as shown in Figure 1.Its feature is that also described RPC sleeve pipe 1 internal configurations has longitudinal reinforcement 3 and stirrup 4, as depicted in figs. 1 and 2.Its feature is that also the reinforcing bar of configuration in the described reinforced concrete post 2 is longitudinal reinforcement 5 and spiral stirrup 6, as depicted in figs. 1 and 2.During enforcement, at first, the reinforcing cage that colligation is made up of longitudinal reinforcement 3 in the RPC sleeve pipe and stirrup 4, and be placed in the mould of making prefabricated RPC sleeve pipe 1; Build the RPC for preparing, make prefabricated RPC sleeve pipe 1; Finish and build form removal after 1 day, and prefabricated RPC sleeve pipe 1 was placed in 90 ℃ the hot water maintenance 48 hours; Prefabricated RPC sleeve pipe 1 is transported to the job site, and hoisted in position; The template of 5 good reinforced concrete beams 8 of the longitudinal reinforcement 4 of assembling reinforcement concrete column 2 and spiral stirrup and floor in prefabricated sleeve pipe 1, the reinforcing bar of good beam of colligation and floor, concreting then, so just formed RPC casing string 7, members such as beam and floor have been formed simultaneously, as shown in Figure 3; Repeating step 4～6 again, progressively finish the construction of each story post and beam.

Claims

1. sleeve pipe reinforced concrete post, the sleeve pipe (1) that it is characterized in that reinforced concrete post (2) is prefabricated RPC sleeve pipe.

2. sleeve pipe reinforced concrete post according to claim 1 is characterized in that described RPC sleeve pipe (1) internal configurations has longitudinal reinforcement (3) and stirrup (4).

3. according to claim 1 or 2 described sleeve pipe reinforced concrete posts, it is characterized in that the reinforcing bar of configuration in the described reinforced concrete post (2) is longitudinal reinforcement (5) and spiral stirrup (6).