CN113216515A - Prefabricated assembled concrete-filled steel tube composite column and building thereof - Google Patents

Abstract

The invention provides a prefabricated steel tube concrete composite column and a building thereof, wherein the composite column comprises a steel tube, a tube filled concrete column, a tube external concrete layer and a steel reinforcement framework; the steel pipe is internally provided with the concrete filled column which is formed by filling and pouring during prefabrication; the outer concrete layer of the pipe is wrapped outside the steel pipe; the steel bar framework is embedded in the concrete layer outside the pipe; and two ends of the steel pipe are respectively provided with a connecting structure. The invention has the advantages of good stress performance, good quality of factory prefabricated components, high construction efficiency, simple and convenient connection, good corrosion and fire resistance, strong durability, wide application range, good economy and the like, and has good application prospect in steel structure engineering.

Description

Prefabricated assembled concrete-filled steel tube composite column and building thereof

Technical Field

The invention relates to the technical field of buildings, in particular to a prefabricated concrete-filled steel tube composite column and a building thereof.

Background

The steel pipe concrete superposed column is a superposed component with steel pipe concrete arranged in the middle of the section of the steel pipe concrete column, and forms a structural system which is independently developed in China. Compared with reinforced concrete and steel reinforced concrete (also called steel reinforced concrete) columns, the steel reinforced concrete column has better compression resistance and seismic resistance. The steel pipe concrete composite column comprises: high-strength concrete is poured in the steel tube, so that the compressive strength of the concrete in the steel tube is greatly improved under the constraint action of the steel tube, and brittle failure cannot occur; the steel pipe concrete is positioned in the middle of the section, so that the advantage of high bearing capacity of the high-strength concrete can be fully exerted, the section size of the column is reduced, and the using space of a building is enlarged; the ductility and the energy consumption capability are strong, and the stress performance is good; the concrete outside the steel pipe can play the advantages of fire resistance and the like.

The steel pipe concrete superposed column has a plurality of advantages, but the field steel bar binding and template building workload is large, and the labor intensity is high; the concrete pouring is wet, so that the construction waste is much; the pouring quality of the concrete is not easy to ensure; the defects and shortcomings of long construction period and the like cannot meet the development requirements of energetically promoting assembly type buildings and saving energy and protecting environment in the current country.

Disclosure of Invention

The invention aims to provide a prefabricated concrete-filled steel tube composite column and a building thereof, which aim to solve at least one technical problem in the prior art.

In order to solve the technical problem, the invention provides a prefabricated assembled concrete-filled steel tube composite column, which comprises: the steel tube, the concrete filled column in the tube, the concrete layer outside the tube and the steel reinforcement framework;

the steel pipe is internally provided with the concrete filled column which is formed by filling and pouring during prefabrication; the outer concrete layer of the pipe is wrapped outside the steel pipe;

the steel bar framework is embedded in the concrete layer outside the pipe;

and two ends of the steel pipe are respectively provided with a connecting structure.

Further, the concrete filled column in the pipe is formed by pouring self-compacting concrete; the outer concrete layer is made of common strength concrete, and the concrete is labeled from C35 to C50.

Further, the steel pipe is a circular steel pipe, a rectangular steel pipe or a polygonal steel pipe.

Further, the framework of steel reinforcement includes: column longitudinal bars and stirrup sets; the column longitudinal ribs are distributed along the length direction of the steel pipe (the column longitudinal ribs are generally parallel to the steel pipe); and the multiple groups of stirrup groups are arranged at intervals in the length direction of the steel pipe and are used for hooping the longitudinal bars of the column so as to fix the longitudinal bar positions of the column and restrain the deformation of the longitudinal bars of the column.

Further, each of the stirrup sets comprises: a column stirrup and a plurality of additional stirrups; and two ends of the additional stirrup are connected with the column stirrup, and the column longitudinal bar is clamped by the additional stirrup and the column stirrup.

Furthermore, a plurality of column longitudinal ribs are arranged at intervals in the circumferential direction of the steel pipe; preferably, the column longitudinal ribs are arranged at the corners of the superposed column; so as to avoid the bracket and the column connecting flange which extend outwards from the column.

Further, the additional stirrup is shaped like a Chinese character 'ji'.

Further, the length of the steel pipe (namely the superposed column) is several times of the height of the building layer. Namely, 1-5 layers of prefabricated steel pipe concrete composite columns are adopted as a prefabricated unit; can be used for center posts, side posts and corner posts.

Furthermore, the concrete layer outside the pipe is provided with a post-cast section (i.e. non-prefabricated, cast-in-place during building construction) at one end or two ends of the steel pipe (i.e. a superposed column).

Further, the bottom of steel pipe is fixed and is provided with the column base bottom plate, is provided with the bolt hole that is used for being connected with the basis on the column base bottom plate. The end part of the steel pipe in the column is provided with a column base bottom plate, a bolt hole is reserved in the steel pipe, and the column base bottom plate is connected with the foundation through a column base bolt; the column longitudinal bars and the foundation joint bars are mechanically connected through reinforcing steel bars; the prefabricated steel tube concrete composite column is provided with a post-cast section at the column base, and after the steel tube in the column is connected with the column longitudinal bar, the post-cast concrete is poured by supporting a formwork to complete the concrete pouring outside the post-cast section of the prefabricated column.

Furthermore, one end or two ends of the steel pipe are provided with connecting flanges for fixedly connecting two adjacent superposed columns.

When the columns are vertically spliced, reserving a concrete post-pouring section at the butt joint part of the superposed columns, arranging a flange at the end part of a steel pipe in each column, and arranging stiffening ribs at intervals along the annular direction of the flange; the steel pipes in the upper and lower section columns are connected through high-strength bolts and flanges, and longitudinal bars at four corners of the columns are mechanically connected through steel bars; and after the steel pipes in the columns are connected with the longitudinal ribs at four corners of the columns, erecting a formwork and pouring concrete outside the steel pipes to complete column-column butt joint.

Further, still include overhanging bracket, overhanging bracket with steel pipe is fixed (preferred welding mode) is connected for be connected with the girder steel. Specifically, the outrigger bracket is divided into two types of a pillar top and a pillar.

Furthermore, a partition plate for sealing an inner hole of the steel pipe is arranged at the top of the steel pipe, and a hole with the diameter not less than 120mm is formed in the middle of the partition plate and used for pouring concrete; air holes with the aperture not less than 20mm are formed in the periphery of the partition plate, so that the air holes are used for ventilation during concrete pouring, and the concrete in the steel pipe is guaranteed to be poured compactly.

Further, the column longitudinal ribs are column inner angle steels. More preferably, it is an equilateral angle steel. So as to be convenient for vertically splicing the upper and lower section superposed columns. The outer concrete layer is provided with a post-cast section at one end or two ends of the steel pipe (namely the superposed column) in the column; a connecting hole is reserved on the exposed part of the post-cast section of the post inner angle steel; when two adjacent sections of superposed columns are butted, the inner angle steels of the columns butted up and down are fixedly connected by utilizing the connecting angle steels and the bolts.

For the butt joint of the post of ordinary reinforcing bar form, utilize angle connector to strengthen the connection position, the angle connector in the post is connected more firmly, and intensity is higher, and efficiency is higher.

In addition, the application also discloses a building adopting the prefabricated steel tube concrete composite column, which further comprises a steel beam and a floor system; the two ends of the steel beam are connected to the steel pipe through the outwards extending brackets;

the floor comprises a concrete precast slab and an existing structural layer; the steel beam comprises an upper flange, a lower flange and a web plate; the end part of the concrete precast slab comprises a lap joint part which is lapped on the lower flange; the existing structural layer is laid above the concrete precast slab, and the upper flange is embedded in the existing structural layer.

Furthermore, the concrete precast slab is provided with a notch for lapping and accommodating the steel beam lower flange below the lapping part, and the height of the notch is greater than the thickness of the lower flange and is used for coating the lower flange in the height direction. I.e. the thickness or height of the overlapping parts is smaller than the thickness or height of the non-overlapping parts.

Furthermore, the steel beam is an unequal flange steel beam, and the lower flange is 40-100 mm wider than the upper flange, so that the concrete precast slab can be placed conveniently.

Furthermore, holes are formed in the web plate at intervals and used for penetrating through the perforated steel bars and the ground heating layer pipeline, concrete on two sides of the web plate is communicated, and structural integrity is improved.

Preferably, the perforated steel bars penetrate through the holes of the web plates of the steel beams and are placed on the top of the concrete precast slab, and the placing length of the top of the concrete precast slab is larger than the lapping length of the bottom steel bars of the concrete precast slab, so that the force transmission of the bottom steel bars of the concrete slab and the joint work of the steel beams and the concrete slabs on two sides are realized.

Furthermore, the steel beam is an equal-flange steel beam, and the upper flange is provided with a notch, so that the lap joint part is inserted between the upper flange and the lower flange from outside through the notch and finally lapped on the lower flange.

Further, the reinforcing rib plate is used for covering the notch and reinforcing the notch; and after the concrete precast slab is installed, covering the reinforced rib plate on the opening, and fixedly connecting two ends of the reinforced rib plate with two side edges of the opening of the upper flange through bolts.

The upper flange and the lower flange of the equal-flange steel beam clamp the lap joint part from the upper direction and the lower direction, so that the upper limit and the lower limit of the lap joint part are realized, and the anti-seismic performance of the structure is greatly improved. Simultaneously for unequal flange girder steel, girder steel bearing capacity promotes greatly.

Further, the existing structural layer comprises a light filling layer and a cast-in-place concrete layer from bottom to top in sequence, and the light filling layer is made of light filling materials.

The light filling layer is used for improving the structural strength and rigidity of the floor system, enhancing the sound insulation performance of the floor system, improving the use comfort and matching different steel beam heights.

The light filling material can be selected from rock wool boards, EPC extruded polystyrene boards, foam concrete, foamed polyurethane and other light materials, is filled between the precast concrete board and the cast-in-place concrete surface layer, and is used for reducing the self weight of the floor slab and improving the heat insulation performance and the sound insulation performance of the floor slab.

Further, the steel bar connecting device also comprises a steel bar connecting sleeve and a prefabricated connecting key; the plurality of steel bar connecting sleeves are preset in the concrete precast slab, and connecting holes are reserved on the top surface of the concrete precast slab by the steel bar connecting sleeves;

the prefabricated connecting keys comprise shear steel bars and concrete prefabricated blocks; the concrete precast block is embedded in the light filling layer, the middle part of the shear steel bar is embedded in the concrete precast block, and the lower end of the shear steel bar extends out of the concrete precast block and the bottom of the light filling layer and is screwed into the connecting hole of the steel bar connecting sleeve; the upper ends of the shear steel bars extend out of the tops of the concrete precast blocks and the light filling layer and extend into the in-situ poured concrete layer.

Preferably, a steel bar anchoring plate is arranged at the upper end of the shear steel bar; and/or a steel bar anchoring plate is arranged at the bottom of the steel bar connecting sleeve. The reinforcing steel bar anchoring plate is used for increasing connection, and reliable force transmission is achieved.

Preferably, the lower end of the shear steel bar is provided with a steel bar straight thread matched with the connecting hole of the steel bar connecting sleeve.

The prefabricated connecting keys are used for connecting the concrete prefabricated slab and the cast-in-place concrete layer, so that the concrete prefabricated slab, the light filling layer and the cast-in-place concrete layer are mixed into a whole, and stress transfer and combined work of the concrete prefabricated slab, the light filling layer and the cast-in-place concrete layer are achieved.

Preferably, the shear reinforcement has a diameter of not less than 12 mm.

Furthermore, the steel bar connecting sleeves are arranged on the concrete precast slab in a matrix manner, and the distance is 400-1500 mm.

Further, the existing structural layer further comprises a lower heat insulation layer, a ground heating layer, an upper heat insulation layer and a building surface layer which are sequentially arranged above the existing cast concrete layer. And a heating pipeline is arranged in the ground heating layer and is used for indoor heating in northern areas in winter. The ground heating layer is arranged on the upper side of the cast-in-place concrete layer and is positioned in the height range of the steel beam web plate; and when the heating pipeline in the ground heating layer meets the steel beam, the heating pipeline penetrates through the steel beam web plate through the hole. The heat preservation layers are arranged above and below the ground heating layer, so that heat loss of the ground heating layer is avoided, and the heating efficiency is improved. And a building surface layer is arranged on the top of the ground heating layer, and the building surface layer manufacturing method is given by a building design manufacturing method. The building surface course is 25-100 mm higher than the upper flange.

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

the prefabricated concrete-filled steel tube composite column and the building thereof have the advantages of good stress performance, good quality of factory prefabricated components, high construction efficiency, simplicity and convenience in connection, good corrosion resistance and fire resistance, strong durability, wide application range, good economical efficiency and the like, and have good application prospects in steel structure engineering.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a prefabricated concrete filled steel tube composite column provided in embodiment 1 of the present invention;

FIG. 2 is a schematic view of the construction of the additional stirrup shown in FIG. 1;

FIG. 3 is a schematic view showing a column shoe connecting structure of a composite column according to example 1;

FIG. 4 is a schematic structural view of a pillar panel in accordance with embodiment 1;

FIG. 5 is a schematic view showing the structure of the column in example 1 when butted;

FIG. 6 is a partially enlarged view showing the butt joint of the pillars in embodiment 1;

fig. 7 is a schematic structural view of the connection between the superposed columns and the steel beams in embodiment 1;

FIG. 8 is a schematic structural view of a top partition of a steel pipe of a laminated column in example 1;

fig. 9 is a schematic structural diagram of a prefabricated concrete filled steel tube composite column provided in embodiment 2 of the present invention;

FIG. 10 is a schematic view showing the structure of the column in accordance with example 2;

fig. 11 is a schematic structural view of a floor deck of a floor-supported steel-concrete composite flat beam floor structure according to embodiment 3 of the present invention;

fig. 12 is a schematic structural view of a floor structure provided with a lightweight filling layer in embodiment 3;

FIG. 13 is a schematic structural view of the preformed bond key of FIG. 12;

FIG. 14 is a schematic structural view of a reinforcing bar coupling sleeve in a concrete precast slab;

FIG. 15 is a schematic diagram of matrix arrangement of reinforcing steel bar connecting sleeves on a concrete slab;

FIG. 16 is a schematic diagram of matrix arrangement of prefabricated connecting keys in a light filling layer;

FIG. 17 is a schematic structural view of the combination of steel beams and concrete precast slabs in example 4 of the present invention;

FIG. 18 is a side view of a steel beam of example 4 of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, the present embodiment provides a prefabricated concrete filled steel tube composite column 100 including: a steel pipe 110, a concrete filled column 120 inside the pipe, a concrete layer 130 outside the pipe and a steel reinforcement framework; a pipe filling concrete column 120 formed by filling and pouring during prefabrication is arranged in the steel pipe 110; the outer concrete layer 130 is wrapped outside the steel pipe 110; the steel reinforcement framework is embedded in the concrete layer 130 outside the pipe; the steel pipe 110 has connection structures at both ends thereof for connection with a foundation, a steel beam, or a column.

The tube-in-tube concrete column 120 is cast from self-compacting concrete; the outer concrete layer 130 is made of common strength concrete, and the concrete is labeled from C35 to C50. The steel pipe 110 is a circular steel pipe, a rectangular steel pipe, or a polygonal steel pipe.

The steel reinforcement skeleton includes: column longitudinal ribs 140 and stirrup sets 150; the column longitudinal ribs 140 are arranged along the length direction of the steel pipe 110, and the column longitudinal ribs 140 are substantially parallel to the steel pipe 110; the plurality of stirrup sets 150 are arranged at intervals in the length direction of the steel pipe 110 and are used for hooping the column longitudinal ribs 140 so as to fix the positions of the column longitudinal ribs 140 and restrain the deformation of the column longitudinal ribs 140. Each stirrup group 150 comprises: a column stirrup 151 and a plurality of additional stirrups 152; the two ends of the additional stirrup 152 are connected with the column stirrup 151, and the column longitudinal bar 140 is clamped by the additional stirrup 152 and the column stirrup 151. A plurality of column longitudinal ribs 140 are arranged at intervals in the circumferential direction of the steel pipe 110; preferably, the column longitudinal ribs 140 are disposed at the corners of the laminated column 100 so as to avoid overhanging corbels and connecting flanges.

As shown in fig. 2, the additional stirrup 152 is n-shaped, hooks are provided at both ends, and a connecting pin or the like which is engaged with the hooks is provided at the corner of the column stirrup 151, whereby the additional stirrup can be quickly laid.

Wherein the length of the steel pipe 110 is several times of the height of the building layer. Namely, the prefabricated assembly type steel pipe concrete composite column 100 adopts 2-3 layers as a prefabricated unit; can be used for center posts, side posts and corner posts.

The concrete layer 130 outside the pipe is reserved with a post-cast section at one end or two ends of the steel pipe 110 and extending out of the bracket and the connecting flange, the steel pipe 110 is exposed at the post-cast section, the on-site installation is convenient, and the post-cast section is cast in place by using a mold after the installation or the connection with the component.

As shown in fig. 3, a column base plate 111 is fixedly provided at the bottom of the steel pipe 110, and as shown in fig. 4, a bolt hole for connecting with a column base anchor bolt 210 of the foundation 200 is provided in the column base plate 111. The column longitudinal bars 140 and the foundation joint bars can be mechanically connected through reinforcing steel bars; the post-cast section 131 is arranged at the column foot position of the outer concrete layer 130, and after the steel tube 110 in the column is connected with the column longitudinal ribs 140, the post-cast concrete is poured by formwork erection to finish the pouring of the outer concrete layer 130 of the outer column pipe of the post-cast section 131 of the prefabricated column.

As shown in fig. 5 to 6, one or both ends of the steel pipe 110 are provided with a connection flange 112 for fixing connection between two adjacent composite columns 100. When the columns are vertically spliced, a concrete post-pouring section 131 is reserved at the butt joint part of the superposed column 100, a flange plate is arranged at the end part of the steel pipe 110 in the column, and stiffening ribs 113 are arranged at intervals along the annular direction of the connecting flange 112; the upper and lower section column inner steel pipes 110 are flange-connected by high-strength bolts, and the column longitudinal bars 140 at the four corners of the column are reinforcing steel bars and are mechanically connected by reinforcing steel bar connecting sleeves 142; after the steel pipe 110 in the column is connected with the column longitudinal ribs 140 at four corners, the post-cast section 131 on the outer side of the steel pipe 110 is cast by a formwork, and then the column-column butt joint connection is completed.

As shown in fig. 7, an overhanging bracket 160 is further included, and the overhanging bracket 160 is fixedly (preferably welded) connected with the steel pipe 110 for connecting with the steel beam 20. Specifically, the outrigger bracket 160 is divided into two types of a column top and a column. When connected, the steel beam 20 is butted against the outrigger bracket 160 and fixed by the connecting plate 162 and the reinforcing bolt 163.

The concrete layer 130 outside the pipe leaves a post-cast section at the position of the extending bracket 160, the extending bracket 160 can be welded on the steel pipe in advance, or the extending bracket 160 is welded and fixed on the steel pipe 110 at the post-cast section according to the height of the layer on site, a hoop hole 161 is reserved on the extending bracket 160, after the extending bracket is connected and fixed with the steel beam, the column hoop 151 penetrates through the hoop hole 161 and is sleeved outside the steel pipe, and then the post-cast section is cast by using a mold. Therefore, the overhung bracket 160 can uniformly transmit part of load to the external concrete layer 130 through the column stirrups 151, the mechanical property of the superposed column is better, the external concrete layer 130 is not easy to crack, and the service life is longer.

The top of the steel pipe 110 is provided with a partition plate 170 for sealing the inner hole of the steel pipe 110, as shown in fig. 8, the middle of the partition plate is provided with a pouring hole 171 with the diameter not less than 120mm for pouring concrete; air holes 172 with the aperture not less than 20mm are formed in the periphery of the partition plate and used for ventilation during concrete pouring so as to ensure that concrete in the steel pipe is poured compactly.

In practice, one of the methods of making and using a hybrid column comprises the steps of:

1) processing steel structure parts of the prefabricated components in a steel structure processing factory, and processing steel structure parts such as a steel pipe in the column, a bracket extending outwards in the middle of the column or a column end connecting flange to form a whole;

2) and (4) transporting the processed steel structure component to a prefabricated part processing factory, and processing a concrete prefabricated part.

3) And placing the steel structure component on a concrete table formwork, binding steel bars, erecting a side formwork, pouring concrete and maintaining to form the prefabricated assembly type concrete-filled steel tube composite column member.

4) After the prefabricated steel tube concrete composite column component is transported to a construction site, construction is carried out from bottom to top, the column base is fixed in sequence and is connected with the steel beam through the bracket extending out of the column, after the bracket in the middle of the column is connected with the steel beam, concrete in the steel tube is poured at the column top, and construction of the prefabricated steel tube concrete composite column is completed through vibration.

5) And hoisting the next section of prefabricated assembled concrete filled steel tube composite column component, connecting the component with the constructed concrete filled steel tube composite column, connecting the steel tubes in the column through flanges, connecting longitudinal bars of the column through reinforcing steel bars mechanically, and connecting and fixing the steel tubes and pouring concrete outside the steel tubes in the bottom connecting area through a formwork. And (5) sequentially constructing upwards to finish the construction of the prefabricated concrete-filled steel tube composite column.

The prefabricated steel tube concrete composite column and the connection structure and the construction method thereof have the following performance advantages:

1) the bearing performance is good, the anti-seismic performance is strong, the column section is small, and the durability is strong. The steel tube concrete composite column inherits the advantages of the steel tube concrete composite column and has the advantages of being good in stress performance, strong in anti-seismic performance, small in column section, strong in durability and the like.

2) The prefabricated and high-quality components in the factory are obtained; the field assembly construction has small wet operation amount, energy conservation and environmental protection. The steel tube concrete composite column realizes the factory prefabrication and field assembly construction of the steel tube concrete composite column, the quality of factory prefabricated components is ensured, and the precision is greatly improved; the field wet operation amount is greatly reduced, and the environmental pollution and the generation of construction waste are greatly reduced.

3) The site operation process is few, and the efficiency of construction is high. This patent construction is simple and convenient, and the construction step is few, and is efficient, has avoided the on-the-spot formwork and the reinforcement work of traditional steel pipe concrete composite column, can improve on-the-spot operating efficiency greatly, saves construction period.

4) The hoisting is convenient, and the connection is simple and convenient. The concrete in the steel pipe is cast later on site, so that the weight of the prefabricated part is greatly reduced, and the on-site hoisting is convenient; the inner steel pipe in the prefabricated part is connected through the flange and the reinforcing steel bar is connected through machinery, so that the on-site connection is simple and convenient, and the efficiency is high.

5) Wide application range and good economic benefit. The method can be suitable for building types such as industrial plants, public buildings, steel structure houses and the like, and has wide application range; meanwhile, the structure has good durability and does not need maintenance in the service life; the combined action of the high-strength material and the steel-concrete is fully utilized, so that the structure has good stress performance and good economic benefit.

Example 2

This embodiment is substantially the same as embodiment 1 except that:

as shown in fig. 9, the column longitudinal rib 140 is a column inner angle steel 141. More preferably, the in-column angle 141 is an equilateral angle. So as to facilitate the vertical splicing of the upper and lower section superposed columns 100. As shown in fig. 10, the external concrete layer 130 is provided with a post-cast section 131 at one end or both ends of the in-column steel pipe 110 (i.e., the composite column 100); a connecting hole is reserved on the exposed part of the post-cast section of the post inner angle steel 141; when two adjacent sections of superposed columns 100 are butted, the steel pipes 110 are fixedly connected through the connecting flange 112; after the upper and lower inner angle bars 141 are butted, the upper and lower butted inner angle bars 141 are fixedly connected by the connecting angle 143 and the bolt.

The butt joint of the post with ordinary reinforcing bar form relatively utilizes angle connector to strengthen the connection position, and the angle connector in the post is connected more firmly, and intensity is higher, and efficiency is higher.

Example 3

The embodiment discloses a building adopting the prefabricated steel tube concrete composite column, which is shown in fig. 7 and 11 and comprises a steel beam 20 and a floor 10; the two ends of the steel beam 20 are connected to the steel pipe 110 through the brackets 160 extending outwards, and the steel beam 20 is hidden in the height range of the floor 10.

The floor 10 comprises a concrete precast slab 11 and a current structural layer; the steel beam 20 comprises an upper flange 22, a lower flange 21 and a web 23; the end of the concrete precast slab 11 includes an overlapping part 11a, the overlapping part 11a overlapping on the lower flange 21; the existing structural layer is laid above the concrete precast slab 11, and the upper flange 22 is embedded in the existing structural layer. The web plate 23 is provided with a through-bar hole 23a and a pipeline hole 23b at intervals, which are respectively used for penetrating through a through-bar and a pipeline of the ground heating layer 14, and the concrete on the two sides of the web plate 23 is communicated, thereby improving the structural integrity.

The existing structural layer is a structural layer laid or poured on site, and as shown in fig. 11, the existing structural layer includes: and a concrete layer 12, a lower insulating layer 13, a ground heating layer 14, an upper insulating layer 15 and a building surface layer 16 are cast. Wherein, the ground heating layer 14 is provided with a heating pipeline inside for indoor heating in winter in northern areas. The ground heating layer 14 is arranged on the upper side of the cast-in-place concrete layer and is positioned within the height range of the steel beam 20 web plate 23; when the heating pipeline in the ground heating layer 14 meets the steel beam 20, the pipeline hole 23b is formed along the web 23 of the steel beam 20 and penetrates through the pipeline hole.

The upper and lower heat preservation that is provided with of ground heating layer 14 avoids 14 heats in ground heating layer to scatter and disappear, improves heating efficiency. The top of the ground heating layer 14 is provided with a building surface layer 16, and the building surface layer 16 practice is given by the building design practice. The building facing 16 is about 25-100 mm higher than the upper flange 22.

The cast-in-place concrete layer 12 is internally provided with perforated steel bars 12a, the perforated steel bars 12a pass through the perforated steel bar holes 23a on the web plates 23 of the steel beams 20 and are placed at the top of the concrete precast slab 11, the placing length of the top of the concrete precast slab 11 is larger than the lapping length of the bottom steel bars of the concrete precast slab 11, and the concrete precast slab is used for realizing the force transmission of the bottom steel bars of the concrete slab and the joint work of the steel beams 20 and the concrete slabs at two sides.

In addition, the fireproof protection layer 30 is laid at the bottom of the lower flange 21; the fireproof protection layer is positioned in a groove formed by enclosing the lower flange 21 of the steel beam 20 and the concrete precast slabs 11 on two sides of the steel beam 20, consists of a fireproof coating 31 with the thickness of at least 15mm and a cement mortar 32 with the thickness of at least 5mm, and is used for providing the fireproof limit for not less than two hours. The fireproof protective layer is carried out after the construction of the building surface layer 16 of the floor 10 is finished, so that the cracking of the fireproof protective layer caused by the deformation of the steel beam 20 due to the post-loading can be avoided.

The concrete precast slab 11 is provided with a notch for overlapping and receiving the lower flange 21 of the steel beam 20 below the overlapping part 11a, and the height of the notch is greater than the thickness of the lower flange 21 for covering the lower flange 21 in the height direction. I.e., the thickness or height of the overlapping portion 11a is smaller than the thickness or height of the non-overlapping portion 11 a. Wherein, the gap is rectangular; the width of the gap is 25-55 mm; the height of the gap is the thickness of the lower flange 21 of the steel beam 20 plus 20-30 mm.

The concrete precast slab 11 is internally provided with slab bottom distribution steel bars 11b and anti-cracking steel bars 11 c; one part of the anti-cracking steel bar 11c is arranged on the upper side of the notch and in the overlapping part 11a of the concrete precast slab 11, and the other part of the anti-cracking steel bar 11c extends into the non-overlapping part of the concrete precast slab 11 and is used for preventing the overlapping part 11a from cracking.

The steel beam 20 in the embodiment is an unequal flange steel beam 20, and the lower flange 21 is wider than the upper flange 22 by 40-100 mm so as to be convenient for placing the concrete precast slab 11.

As shown in fig. 12, in the above technical solution, optionally, the existing structural layer may further include a light filling layer 17, and the light filling layer 17 is laid between the cast-in-place concrete layer 12 and the concrete precast slab 11, and is used to improve the structural strength and rigidity of the floor 10, enhance the sound insulation performance of the floor 10, improve the use comfort, and match different heights of the steel beam 20, i.e., to play a role of raising, so that the existing structural layer completely covers or wraps the steel beam 20, and has a light weight and a low cost.

The lightweight filling layer 17 is composed of a lightweight filling material. The light filling material can be selected from rock wool boards, EPC extruded polystyrene boards, foam concrete, foamed polyurethane and other light materials, is filled between the precast concrete board and the cast-in-place concrete surface layer, and is used for reducing the self weight of the floor slab and improving the heat insulation performance and the sound insulation performance of the floor slab.

Prefabricated connecting keys 40 are embedded in the light filling layer 17, as shown in fig. 13, the prefabricated connecting keys 40 comprise shear steel bars 42 and concrete prefabricated blocks 41; the concrete precast block is embedded in the light filling layer 17, the middle part of the shear steel bar 42 is embedded in the concrete precast block 41, and the lower end of the shear steel bar extends out of the concrete precast block and the bottom of the light filling layer 17 and is screwed into the steel bar connecting sleeve 50 in the concrete precast slab 11; the upper ends of the shear steel bars extend out of the top of the concrete precast block and the light filling layer 17 and extend into the cast-in-place concrete layer 12. A first steel bar anchoring plate 42a is fixedly arranged at the upper end of the shear steel bar; as shown in fig. 14, the bottom of the steel bar connecting sleeve 50 is provided with a second steel bar anchoring plate 51 for increasing the connection and realizing reliable force transmission.

Wherein, a plurality of steel bar connecting sleeves 50 are preset in the concrete precast slab 11, and the steel bar connecting sleeves 50 are provided with connecting holes (threaded holes) on the top surface of the concrete precast slab 11; the lower end of the shear reinforcement 42 is provided with a reinforcement straight thread adapted to the coupling hole of the reinforcement coupling sleeve 50.

As shown in fig. 15, the reinforcing bar connecting sleeves 50 are arranged on the concrete precast slab 11 in a matrix form with a distance of 400mm to 1500 mm. As shown in fig. 16, the preformed connection bonds 40 are also arranged in a matrix within the lightweight filler layer 17.

The prefabricated connecting key 40 is used for connecting the concrete precast slab 11 and the cast-in-place concrete layer, so that the concrete precast slab 11, the light filling layer 17 and the cast-in-place concrete layer are mixed into a whole, and stress transfer and the joint work of the three are realized. Preferably, the shear reinforcement is no less than 12mm in diameter.

Example 4

The structure of the present embodiment is substantially the same as that of embodiment 1, except that:

as shown in fig. 17, the steel beam 20 is an equal-flange steel beam 20, one or more slits 22b are formed in the upper flange 22, and the overlapping part 11a of the concrete precast slab 11 is inserted between the upper flange 22 and the lower flange 21 through the slits, then horizontally moved, sequentially arranged side by side, and finally overlapped on the lower flange 21.

As shown in fig. 18, a reinforcing rib plate 60 for covering and reinforcing the notch is further included; after the concrete precast slab 11 is installed, the openings are covered by the reinforcing rib plates, and two ends of the reinforcing rib plates are fixedly connected with two side edges of the openings of the upper flange 22 through bolts.

The upper flange 22 and the lower flange 21 of the equal-flange steel beam 20 clamp the lapping part 11a from the upper direction and the lower direction, so that the upper limit and the lower limit of the lapping part 11a are realized, and the seismic performance of the structure is greatly improved. Simultaneously for unequal flange girder steel 20, girder steel 20 bearing capacity promotes greatly.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a prefabricated assembled steel pipe concrete composite column which characterized in that includes: the steel tube, the concrete filled column in the tube, the concrete layer outside the tube and the steel reinforcement framework;

the steel pipe is internally provided with the concrete filled column which is formed by filling and pouring during prefabrication; the outer concrete layer of the pipe is wrapped outside the steel pipe;

the steel bar framework is embedded in the concrete layer outside the pipe;

and two ends of the steel pipe are respectively provided with a connecting structure.

2. The prefabricated assembled concrete-filled steel tube composite column according to claim 1, wherein the steel reinforcement cage comprises: column longitudinal bars and stirrup sets; the column longitudinal ribs are distributed along the length direction of the steel pipe; and the multiple groups of stirrup groups are arranged at intervals in the length direction of the steel pipe and are used for hooping the longitudinal bars of the column so as to fix the longitudinal bar positions of the column and restrain the deformation of the longitudinal bars of the column.

3. The prefabricated concrete-filled steel tube composite column according to claim 2, wherein each of the stirrup sets comprises: a column stirrup and a plurality of additional stirrups; and two ends of the additional stirrup are connected with the column stirrup, and the column longitudinal bar is clamped by the additional stirrup and the column stirrup.

4. The prefabricated concrete-filled steel tube composite column according to claim 2, wherein a plurality of column longitudinal bars are arranged at intervals in the circumferential direction of the steel tube; the column longitudinal ribs are arranged at the corners of the superposed column; so as to avoid the overhanging bracket and the connecting flange.

5. The prefabricated concrete-filled steel tube composite column according to claim 3, wherein the additional stirrups are n-shaped.

6. The prefabricated assembled concrete-filled steel tube composite column according to claim 1, wherein the steel tube has a length several times the building story height.

7. The prefabricated concrete-filled steel tube composite column according to claim 1, wherein the outer concrete layer is provided with a post-cast section at one or both ends of the steel tube.

8. The prefabricated steel tube concrete composite column as claimed in claim 1, wherein a column base plate is fixedly arranged at the bottom of the steel tube, and a bolt hole for connecting with a foundation is formed in the column base plate.

9. The prefabricated assembled concrete-filled steel tube composite column according to claim 1, wherein one end or two ends of the steel tube are provided with connecting flanges for fixed connection between two adjacent composite columns;

still include overhanging bracket, overhanging bracket with steel pipe fixed connection for be connected with the girder steel.

10. A building using the prefabricated concrete-filled steel tube composite column as recited in any one of claims 1 to 9, further comprising a steel beam and a floor slab; the two ends of the steel beam are connected to the steel pipe through the outwards extending brackets;

the floor comprises a concrete precast slab and an existing structural layer; the steel beam comprises an upper flange, a lower flange and a web plate; the end part of the concrete precast slab comprises a lap joint part which is lapped on the lower flange; the existing structural layer is laid above the concrete precast slab, and the upper flange is embedded in the existing structural layer.

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