CN106437034A - Steel tube and semi-prefabricated semi-cast-in-place construction waste recycled concrete combined column and preparation method thereof - Google Patents

Abstract

The invention discloses a combined column of steel pipe and semi-prefabricated and semi-cast-in-situ construction waste recycled concrete and a preparation method thereof. It consists of cast-in-place recycled aggregate concrete, with stiffening ribs on the inside of the steel pipe, concentrically placing a recycled block concrete core column in the cavity of the steel pipe, and pouring recycled bone between the steel pipe and the recycled block concrete prefabricated core column feed concrete. The composite column of the steel pipe and the semi-prefabricated and semi-in-situ cast-in-place recycled concrete is convenient to manufacture as a whole, has high economic benefits, improves the bearing capacity of the structure, improves its deformation performance, and increases the ductility of the component. The design of the steel pipe with stiffeners can make the steel pipe and the recycled aggregate concrete more tightly bonded, and improve the integrity of the steel pipe recycled concrete composite column. The invention is suitable for structures such as heavy loads, industrial workshops, high-rise buildings and large spans.

Description

A steel pipe and semi-prefabricated semi-in-situ construction waste recycled concrete composite column and its preparation method

technical field

The invention belongs to the technical field of civil engineering, and in particular relates to a method for preparing a steel pipe concrete column in which construction waste recycled concrete is used as a filling material.

technical background

Among urban waste, construction waste accounts for 30% to 40% of the total waste. In the future, as urban construction progresses from extensional development to connotative large-scale old city renovation, the amount of construction waste generated in my country will continue to grow. In the face of increasingly severe environmental pollution, increasingly tense land supply, and increasingly depleted mineral resources, a huge amount of construction waste is bound to aggravate the contradiction between people, the environment, and resources, and affect the coordinated development of the urban ecological environment. The comprehensive utilization of construction waste is urgent.

According to statistics, the construction waste generated in my country every year, the total amount of waste concrete alone reaches more than 120 million tons. The waste concrete in the construction waste is crushed and used as recycled aggregates to manufacture components in the building structure, which can solve the problem of shortage of natural aggregate resources, realize the regeneration and recycling of concrete, and achieve sustainable development.

At present, the construction of super high-rise buildings in domestic cities is developing rapidly. As a new composite structure, steel tube concrete has been widely used in super high-rise building structures. It is mainly a compression member with axial compression and small force eccentricity, and is widely used in frame structures (such as factory buildings and high-rise buildings). The steel pipe recycled concrete composite column involved in the present invention combines the advantages of the maturity of traditional steel pipe concrete technology and the large amount of construction waste in my country, and is made into a composite column with stiffening ribs on the pipe wall, which better improves the steel pipe concrete. The overall performance, mechanical performance and construction performance of the column have many advantages such as low cost, simple construction, short construction period, and good protection of the ecological environment.

Contents of the invention

In order to solve the above technical problems, the present invention provides an energy-saving, environment-friendly, high-strength composite column of steel pipes and semi-prefabricated, semi-cast-in-situ construction waste recycled concrete. It is composed of steel pipe, recycled block concrete prefabricated core column and cast-in-situ recycled aggregate concrete. The gap between the steel pipe and the recycled block concrete prefabricated core column is poured with construction waste recycled aggregate concrete, thereby preparing a steel pipe and semi-prefabricated semi-in-situ Pouring construction waste recycled concrete composite columns.

In order to solve the above problems and realize the above requirements, the present invention adopts the following technical solution: a composite column of steel pipe and semi-prefabricated semi-in-situ construction waste recycled concrete, including steel pipe, recycled block concrete prefabricated core column, steel pipe and recycled block Sandwich between concrete prefabricated core columns.

1. The column skeleton is made of steel pipe. The length, width and height of the steel pipe body are selected according to the actual construction requirements; the length, width and height of the internal recycled block concrete prefabricated core column are selected according to the actual construction requirements.

2. There are stiffening ribs at a certain distance on the steel pipe. The stiffeners are evenly distributed around the pipe, with a spacing of 10cm and a vertical interval of 15cm.

3. At the top of the prefabricated core column of recycled block concrete, a prism groove with an inner depth of 30cm is opened. The upper surface of the prism groove is a square with a side length of 20cm, and the bottom surface is a square with a side length of 15cm. At the bottom of the concrete prefabricated core column, a 25cm-high cube protrusion is made, and the side length of the cube is 10cm, so that the upper column joint protrusion and the lower column joint groove can be butted up and down, and the joint is fixed with cement mortar to form a whole.

4. The interlayer between the steel pipe and the recycled block concrete prefabricated core column is poured with recycled aggregate concrete.

5. The construction technology of prefabricated core column of recycled block concrete: the forming formwork is made in a flat way, and the hoisting hook is pre-buried in advance, and the waste concrete block is fully watered and moistened in advance. When pouring, put pre-wetted waste concrete blocks in the formwork, and then add new concrete. The weight ratio of recycled block concrete to new concrete is optimal between 2:1-4:1. The blocks used for recycled block concrete are the waste concrete blocks after the old buildings, structures, roads, bridges or dams are removed and the protective layer and all or part of the steel bars are removed. The size of the blocks used in recycled block concrete should be selected according to the actual design requirements, and should not be too large or too small. New concrete is poured between the blocks to ensure the integrity of the structure.

Advantages of the present invention:

1. The present invention is applicable to the mixed structure of steel and concrete, and the recycled block coagulation prefabricated core column is industrially produced, with high strength, good corrosion resistance and durability, and convenient construction.

2. The design of steel pipe with stiffening ribs on the surface can increase the bonding force between steel pipe and concrete interface when pouring recycled aggregate concrete, significantly improve the ultimate bearing capacity, deformation capacity and ductility of components, and effectively prevent steel pipe and concrete The interface is hollowed out, and the restraint of the steel pipe on the core concrete can be improved to maintain better stability and ensure the strength of the structure.

3. Recycled concrete from construction waste is used to replace ordinary concrete. It is green, energy-saving, light, high-strength and durable, and greatly reduces costs.

4. The grooves and convex structures at the upper and lower ends of the recycled block concrete prefabricated core column can be connected to each other, and can be widely used in high-rise buildings, making the construction engineering convenient and stylized.

5. The use of recycled block concrete as the prefabricated core column greatly simplifies the crushing, screening, purification and other treatment processes during recycling of waste concrete, saves a lot of manpower, time and energy, and can realize efficient recycling of construction waste. In addition, the choice of block concrete can achieve a good structural integrity. Greatly improve the strength of the column.

Description of drawings:

Fig. 1 is a top view of a steel pipe with a square section and a recycled block concrete prefabricated core column with a circular section.

In the figure: 1—steel pipe; 2—cast-in-situ recycled aggregate concrete; 3—prefabricated core column of recycled block concrete; 4—stiffener.

Fig. 2 is a top view of a circular cross-section steel pipe and a circular cross-section recycled block concrete prefabricated core column.

Fig. 3 is a top view of a circular cross-section steel pipe and a square cross-section recycled block concrete prefabricated core column.

Fig. 4 is a top view of a square-section steel pipe and a square-section recycled block concrete prefabricated core column.

Fig. 5 is a side view of a composite column of steel pipe and semi-prefabricated and semi-cast-in-situ construction waste recycled concrete.

In the figure: 3—regenerated block concrete prefabricated core column; 5—protrusion; 6—groove.

detailed description

The present invention will be further described below in conjunction with accompanying drawings 1-5 of the description.

As shown in the figure, the embodiment of the present invention describes a composite column of steel pipe and semi-prefabricated semi-cast-in-situ construction waste recycled concrete. It is composed of aggregate concrete 2 and prefabricated core column 3 of recycled block concrete. The internal regenerated block concrete prefabricated core column 3 is made by formwork, the inside of the steel pipe 1 has stiffeners 4, and the recycled block concrete prefabricated core column 3 and the steel pipe 1 are placed concentrically. The present invention replaces traditional reinforced concrete columns with a steel pipe and semi-prefabricated, semi-cast-in-place construction waste recycled concrete composite column. The steel pipe and semi-prefabricated, semi-cast-in-situ construction waste recycled concrete composite column of the present invention is convenient to manufacture as a whole and has high economic benefits, and can Effectively improve the bearing capacity of the structure and improve its deformation performance, increase the ductility of components. Among them, the design of the steel pipe 1 with the stiffener 4 can make the steel pipe and the recycled aggregate concrete better in bonding performance, and improve the integrity of the composite column.

Example 1:

1. Select a steel plate with a suitable size and a suitable strength grade, and continuously roll the stiffener 4 on it. The height of the stiffener 4 is suitable, which is 1/4 of the radius difference between the steel pipe 1 and the prefabricated core column 3 of recycled block concrete. The steel plate of the stiffener 4 is bent and welded to form a steel pipe 1 with a difference d between the inner diameter of the cavity and the inner diameter of the prefabricated recycled block concrete column greater than 10 cm.

2. Make the formwork in a flat way, and pre-buy the hoisting hooks in advance when making the recycled block concrete prefabricated core column 3, and fully water the waste concrete block to moisten it. When pouring, put the pre-wetted waste concrete blocks in the formwork, and then add new concrete, the weight ratio is 2:1.

3. A prism body groove 6 with an inner depth of 30cm is opened at the top of the recycled block concrete prefabricated core column 3. The top surface of the prism body groove 6 is a square with a side length of 20 cm, and the bottom surface is a square with a side length of 15 cm. The bottom end of the regenerated block concrete prefabricated core column 3 is made a cube protrusion 5 with an outward protrusion of 25 cm, and the side length of the cube is 10 cm.

4. During installation, transport the prefabricated recycled block concrete core column to the construction site, firstly fully water and moisten it, first use the crane to fix the surface-wetted recycled block concrete segment through the hoisting hook, Install the steel pipe 1 concentrically again.

5. Pour recycled aggregate concrete 2 into the interlayer part of the steel pipe 1 and the prefabricated core column 3 of recycled block concrete, and insert a vibrating rod to fully vibrate until the space inside the steel pipe 1 is filled, cured until hardened, and finally in the steel pipe 1 The surface is plastered with mortar, and after it is solidified, steel pipes and semi-prefabricated and semi-cast-in-situ construction waste recycled concrete composite columns are obtained.

Example 2:

1. Select a steel plate with a suitable size and a suitable strength grade, and continuously roll the stiffener 4 on it. The height of the stiffener 4 is suitable, which is 1/4 of the radius difference between the steel pipe 1 and the prefabricated core column 3 of recycled block concrete. The steel plate of the stiffener 4 is bent and welded to form a steel pipe 1 with a difference d between the inner diameter of the cavity and the radius of the prefabricated recycled block concrete column greater than 10 cm.

2. Make the formwork in a flat way, and pre-buy the hoisting hooks in advance when making the recycled block concrete prefabricated core column 3, and fully water the waste concrete block to moisten it. When pouring, put the pre-wetted waste concrete blocks in the formwork, and then add new concrete, the weight ratio is 3:1.

3. A prism groove 6 with an inner depth of 30cm is opened on the top of the prefabricated core column 3 of recycled block concrete. The bottom end of the regenerated block concrete prefabricated core column 3 is made a cube protrusion 5 with an outward protrusion of 25 cm, and the side length of the cube is 10 cm.

4. When installing, transport the prefabricated recycled block concrete core column to the construction site, firstly water and wet it fully, first use a crane to fix the surface-wetted recycled concrete segment through the hoisting hook, and then concentrically Install steel pipe 1.

5. Pour recycled aggregate concrete 2 into the interlayer part of the steel pipe 1 and the prefabricated core column 3 of recycled block concrete, and insert a vibrating rod to fully vibrate until the space inside the steel pipe 1 is filled, cured until hardened, and finally in the steel pipe 1 The surface is plastered with mortar, and after it is solidified, steel pipes and semi-prefabricated and semi-cast-in-situ construction waste recycled concrete composite columns are obtained.

Example 3:

1. Select a steel plate with a suitable size and a suitable strength grade, and continuously roll the stiffener 4 on it. The height of the stiffener 4 is suitable, which is 1/4 of the radius difference between the steel pipe 1 and the prefabricated core column 3 of recycled block concrete. The steel plate of the stiffener 4 is bent and welded to form a steel pipe 1 with a difference d between the inner diameter of the cavity and the radius of the prefabricated recycled block concrete column greater than 10 cm.

2. Make the formwork in a flat way, and pre-buy the hoisting hooks in advance when making the recycled block concrete prefabricated core column 3, and fully water the waste concrete block to moisten it. When pouring, put the pre-wetted waste concrete blocks in the formwork, and then add new concrete, the weight ratio is 4:1.

3. A prism groove 6 with an inner depth of 30cm is opened on the top of the regenerated block concrete prefabricated core column 3. The top surface of the prism groove 6 is a square with a side length of 20cm, and the bottom surface is a square with a side length of 15cm. The block concrete prefabricated core column 3 bottom is made a cube protrusion 5 that protrudes 25cm, and the side length of the cube is 10cm.

4. During installation, transport the prefabricated recycled block concrete core column to the construction site, firstly fully water and moisten it, first use the crane to fix the surface-wetted recycled block concrete segment through the hoisting hook, Install the steel pipe 1 concentrically again.

5. Pour recycled aggregate concrete 2 into the interlayer part of the steel pipe 1 and the prefabricated core column 3 of recycled block concrete, and insert a vibrating rod to fully vibrate until the space inside the steel pipe 1 is filled, cured until hardened, and finally in the steel pipe 1 The surface is plastered with mortar, and after it is solidified, steel pipes and semi-prefabricated and semi-cast-in-situ construction waste recycled concrete composite columns are obtained.

In specific implementation, it is preferable that the stiffening ribs 4 on the steel pipe 1 can be in various forms, and the ends of the ribs can be square, triangular, trapezoidal or form a steel mesh.

The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention are all It should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims.

Claims (4)

1. a kind of steel pipe and half prefabricated half cast-in-place construction refuse regenerated concrete combination column：It is characterized in that, including steel pipe conduct Spinous process of the seventh cervical vertebra frame, the length and width of steel tube body and the high size suitable according to practice of construction requirement selection；Internal regeneration monolith is pre- The length and width of coremaking post and the high size suitable according to practice of construction requirement selection, steel pipe upper band ribbed stiffener at regular intervals, then A prismoid groove is opened on raw monolith prefabricated core column top, and regeneration monolith prefabricated core column bottom does one simultaneously Square is raised, and the interlayer between steel pipe and regeneration monolith prefabricated core column pours for regenerated aggregate concrete and forms.

2. a kind of steel pipe according to claim 1 and half prefabricated half cast-in-place construction refuse regenerated concrete combination column, it is special Levy and be, steel pipe is welded by the steel plate with ribbed stiffener, for the form of remaining silent, ribbed stiffener is distributed on the one side of steel plate, The inner side of steel plate, the ribbed stiffener on steel plate is continuous or interrupted.

3. a kind of steel pipe according to claim 1 and half prefabricated half cast-in-place construction refuse regenerated concrete combination column, it is special Levy and be, the ribbed stiffener length on steel plate is the 1/4 of the difference of regeneration monolith prefabricated core column and steel pipe radius, ribbed stiffener around The spacing in pipe direction is 10cm, and on vertical direction, the spacing of ribbed stiffener is 15cm.

4. a kind of steel pipe and half prefabricated half cast-in-place construction refuse regenerated concrete combination column preparation method it is characterised in that with The mode keeping flat makes forming panel, and shifts to an earlier date pre-buried lifting crotch well, in advance fully waste and old concrete block is poured water-wet, In forming panel, when pouring, throw in the waste and old concrete block of pre-wetting, add novel concrete, regenerate monolith With the weight of novel concrete than 2:1-4:Optimum between 1, it is recessed that a prismoid is opened on regeneration monolith prefabricated core column top Groove, regenerates monolith prefabricated core column bottom simultaneously and does a square projection, in upper prop section projection and hypomere post section groove Under be mutually butted, in junction, cement mortar is closed admittedly, is formed overall.