CN102140850B - Frame with floors of composite grid structure and construction method thereof - Google Patents

Abstract

The present invention relates to a frame and a construction method using a combined grid structure as a floor slab, and belongs to the building frame structure in the field of civil engineering structures. The grid floor is connected, and the composite grid floor is installed layer by layer in the space surrounded by frame columns and frame beams; the composite grid floor is formed by installing the reinforced concrete slab and the web and bottom chord of the grid. The web is located between the reinforced concrete slab and the lower chord, and the four adjacent reinforced concrete slabs are fixedly connected by connecting plates at diagonal positions, the web and the connecting plate are welded, and the web and the lower chord are connected by hollow ball joints. The invention can give full play to the strength advantages of two different materials: concrete under compression and steel under tension, and realize self-supporting, high rigidity and good stability in the construction stage.

Description

The Frame and Construction Method of the Floor Slab Using the Composite Grid Structure

technical field

The invention relates to a house frame structure in the field of civil engineering structures, in particular to a frame using a combined grid structure as a floor slab and a construction method thereof.

Background technique

Most of the floors of houses built with reinforced concrete frames or prestressed concrete frames are reinforced concrete structures. During the construction process of adding floors to existing houses, the original houses cannot bear the self-weight and pressure from the top of the new building structure. Due to the high construction load, it is difficult to guarantee the safety and normal use of the original building during the construction process of building additional floors; for high-rise or super high-rise buildings with concrete giant frame structures, due to the high cost of formwork and support, it has not yet been realized to build the giant structure first, and then Use each megastructure layer as the construction site to build substructures, so that the substructures in each megastructure layer can be built in parallel.

Contents of the invention

The object of the present invention is to provide a frame and its construction method using a combined network frame structure as a floor slab, which is used to solve the problem of using a conventional frame to ensure the safety and security of the original house in the construction process during the construction of an existing house. In normal use and not yet realized, first build the megastructure, and then use each megastructure layer as the construction site to build substructures, so as to go hand in hand with the problem of building substructures in each megastructure layer.

The technical solution adopted by the present invention to solve the technical problem is: the frame made of the combined grid structure is composed of frame columns, frame side beams, and combined grid floor slabs, and the combined grid floor is installed layer by layer. In the space enclosed by frame columns and frame side beams; the combined grid floor is formed by installing the reinforced concrete slab and the web and lower chord of the grid. The web is located between the reinforced concrete slab and the lower chord, and the adjacent four The reinforced concrete slabs are fixedly connected by connecting plates at opposite corners, the webs are welded to the connecting plates, and the webs and lower chords are connected by hollow ball joints; the joints between the frame columns and the composite grid floor are divided into upper and lower The one-piece trough-shaped connector is inserted and welded outside the frame column. There is an arc-shaped groove on the lower edge of the two surfaces corresponding to the upper connecting split, and the lower edge of the other surface of the upper connecting split has a Horizontal connecting plate; there is an arc groove on the upper edge of the corresponding two faces of the lower connecting split body, and there is a horizontal connecting plate on the upper edge of the other face of the lower connecting split body, the connecting plate and the frame column Stiffeners are installed between them; the joint between the frame side beam and the composite grid floor is composed of two connecting pieces that are buckled and welded outside the frame side beam. The connecting piece has connecting ears, and the two connecting pieces pass bolts at the connecting ears. Fixed, the web bar and the connecting ear are welded together.

In the above scheme, prestressed tendons are arranged on the network frame.

In the above scheme, the frame columns adopt square steel pipe concrete columns, and the frame edge beams adopt round steel pipe concrete beams.

In the above scheme, the prestressed tendons are prestressed tendons with two supporting points and three broken lines. The prestressed tendons with two supporting points and three broken lines are formed by penetrating steel bars into steel pipes. The steel pipes are in the shape of trapezoidal grooves with a horizontal bottom. Two steel pipe support members, the two ends of the prestressed tendons are respectively anchored on the frame columns, and each steel pipe support member is fixed together with the lower chord node on it.

In the above scheme, the prestressed tendons are double-broken line prestressed tendons, and the double-broken line prestressed tendons are formed by anchoring the two ends of the steel bars on the frame columns after passing through the bottom of the positioning support. The positioning support has an arc-shaped base, and the bottom surface of the base A through groove runs through it, and symmetrically arranged oblique steel pipes are welded on the upper end of the base, and the oblique steel pipes are fixed together with the nodes of the lower chord.

In the above scheme, the prestressed tendons are prestressed tendons with three support points and four broken lines. The prestressed tendons with three support points and four broken lines are formed by anchoring the two ends of the steel bar to the frame column after passing through the bottom of the positioning support. The positioning support has an arc shape The bottom surface of the base runs through a through groove, and the upper end of the base is welded with symmetrically arranged oblique steel pipes. Steel tube support members are fixed between the steel bars and the lower chord nodes.

Beneficial effect:

1) The achievable span is large;

The floor slab of the present invention adopts a composite grid structure, which is a three-dimensional force-bearing space structure, and the rods intersecting in space support each other, organically combining the force-bearing rods and the supporting rods.

2) The force is reasonable;

The combined grid structure is under compression on the upper part and tension on the lower part, which can give full play to the strength advantages of two different materials, concrete under compression and steel under tension.

3) economy;

Due to the overall space effect of the grid frame, it has high rigidity, good stability, is not very sensitive to local structural defects, and has the ability to bear forces in all directions. Compared with ordinary steel grid frames with the same span, its steel consumption can be saved by 15%. ~25%.

4) The combined grid frame can combine the bearing function and maintenance function of the structure into one.

The reinforced concrete slab can not only be combined with the grid structure to bear various loads on the floor, realize self-supporting during the construction stage, but also can be used as an ordinary slab for maintenance.

Description of drawings:

Fig. 1 is the structural representation of the first embodiment of the present invention;

Fig. 2 is a plan view of the first embodiment of the present invention;

Fig. 3 is the schematic diagram of reinforced concrete slab and web bar connection structure among the present invention;

Fig. 4 is the sectional view of reinforced concrete slab and web bar connecting knot among the present invention;

5 is a schematic structural view of a second embodiment of the present invention;

Fig. 6 is the structural representation of the first embodiment of prestressed tendons in the present invention;

Figure 7 is an enlarged view of the prestressed tendon in Figure 6;

Fig. 8 is the structural representation of the second embodiment of prestressed tendons in the present invention;

Fig. 9 is the structural representation of the third embodiment of prestressed tendons in the present invention;

Figure 10 is an enlarged view of the positioning support in Figure 9;

Figure 11 is a side view of the positioning support in Figure 10;

Fig. 12 is the schematic diagram of the set-up superstructure system built in the present invention;

Fig. 13 is the side elevation view of the connection node between grid frame and column in the present invention;

Fig. 14 is a schematic diagram of the connector in Fig. 13;

Figure 15 is a top view of the connector in Figure 13;

Fig. 16 is the plan view of the connecting nodes between grid frame and column in the present invention;

Fig. 17 is a three-dimensional view of the connection node between grid frame and beam of the present invention;

Fig. 18 is a sectional view of A-A in Fig. 2 .

1 Frame column 2 Frame side beam 3 Composite grid floor 4 Reinforced concrete slab 5 Web bar 6 Bottom chord 7 Connecting plate 8 Prestressed tendon 9 Steel pipe support member 10 Positioning support 11 Connecting piece 12 Connecting plate 13 Connecting piece 14 Connecting ear 15 Substructure 16 bolts 17 stiffeners

Detailed ways:

Below in conjunction with accompanying drawing, the present invention will be further described:

In conjunction with Fig. 1, shown in Fig. 2, this frame that makes floor slab with combined network frame structure is formed by frame column 1, frame side beam 2, combined network frame floor 3 connections, and the present invention adopts reinforced concrete plate to replace general steel network frame The upper chord, thus forming a composite structure in which the steel structure and the reinforced concrete structure work together, is a composite structure in which the slab system, the beam system and the rod system are jointly stressed; the composite grid floor 3 is installed on the frame layer by layer In the space enclosed by column 1 and frame side beam 2; frame column 1 is connected to composite grid floor 3 through nodes, frame side beam 2 is connected to composite grid floor 3 through nodes, frame column 1 adopts square steel pipe concrete column, frame Side beam 2 adopts circular steel pipe concrete beam. The combined grid frame has high rigidity and light weight, and is suitable for building large-span floor structures with large loads, such as warehouses, factories, department stores, exhibition halls, etc. In addition, the self-supporting structure of the construction stage can be realized in the building and adding layers, and the construction load can be avoided to be transmitted to the original building.

The combined grid floor 3 is formed by installing the reinforced concrete slab 4, the web 5 and the lower chord 6 of the grid. The web 5 is located between the reinforced concrete slab 4 and the lower chord 6. The reinforced concrete slab 4 in this embodiment It is a reinforced concrete slab with ribs, as shown in Fig. 3 and Fig. 4, the four adjacent reinforced concrete slabs 4 are fixedly connected through the connecting plate 7 at the diagonal, and the web bar 5 is welded to the connecting plate 7; the web bar 5 is connected with the lower chord 6 through a hollow spherical joint. The combined grid floor slab has the advantages of simple structure, light weight and strong load-bearing capacity.

Fig. 5 is a structural schematic diagram of the second embodiment of the present invention. The difference between the frame of the floor slab with the combined grid structure and that shown in Fig. 1 is that the grid frame of the frame of the floor slab is made of the combined grid structure Prestressed tendons 8 are arranged on the top, and the prestressed tendons 8 are double broken line prestressed tendons. Referring to Fig. 8, this kind of double-broken prestressed tendon 8 is formed by anchoring the two ends of the steel bar on the frame column 1 after passing through the bottom of the positioning support 10. The positioning support 10 has an arc-shaped base, and the bottom surface of the base runs through There is an upward through groove, and the steel bar sinks into the through groove, which can realize the positioning of the steel bar. The upper end of the base is welded with symmetrically arranged inclined steel pipes, and the inclined steel pipes are fixed together with the 6 nodes of the lower chord. The layout of double broken line prestressed tendons is simple, the span can be realized is large, and the loss of prestress is small. The prestress generated on the structure is concentrated in the mid-span where the internal force is relatively large, which is beneficial to reduce or offset the concentrated external load in the mid-span of the structure. effect.

The prestressed tendons shown in Figure 6 are prestressed tendons with two supporting points and three broken lines. Two steel pipe support members 9 are welded at the upper end of the bottom, and the two ends of the prestressed tendons 8 are respectively anchored on the frame column 1, and each steel pipe support member 9 is fixed together with the lower chord 6 nodes on it. The three-fold line prestressed tendons are arranged simply, the achievable span is large, and the loss of prestress is small. The pre-stress generated on the structure is concentrated near the mid-span where the internal force is relatively large, which is beneficial to reduce or offset many places near the mid-span of the structure. Concentrated external loads.

The prestressed tendons shown in Fig. 9 are prestressed tendons with three supporting points and four broken lines, and the prestressed tendons with three supporting points and four broken lines are anchored on the frame column 1 after passing through the bottom of the positioning support 10 by the steel bars, and are formed in conjunction with Fig. 10 and Fig. As shown in 11, the positioning support 10 has an arc-shaped base, the bottom surface of the base runs through an upward through groove, and the upper end of the base is welded with symmetrically arranged oblique steel pipes, and the oblique steel pipes and the 6 nodes of the lower chord are fixed together, and the positioning support 10 is respectively provided with a steel pipe support member 9 between the two ends anchored by the steel bar, and each steel pipe support member 9 is fixed between the steel bar and the 6 nodes of the lower chord. The arrangement of prestressed tendons with three support points and four broken lines is close to parabola, which can realize large span and small loss of prestress, and the prestress generated on the structure is close to uniform force, which is beneficial to reduce or offset the structure's self-weight and uniform external load. role.

Fig. 12 is a schematic diagram of the superstructure system of building and adding floors built by the present invention; in the construction process of building and adding superstructures of existing houses, firstly, the present invention is used to construct the giant structure, and then each giant structure layer is used as the construction site for construction Substructures 15, so as to go hand in hand to build substructures 15 in each megastructure layer. Save the cost of materials and construction costs for templates and supports, and shorten the construction period.

As shown in Figure 13 and Figure 16, the joints between the frame column 1 and the combined grid floor 3 are formed by inserting and welding the upper and lower split groove connectors 11 outside the frame column 1, and the upper connection is separated from each other. There is an arc-shaped groove on the lower edge of the corresponding two surfaces, and there is a boss on the lower edge of the other surface connected to the upper part, that is, the lower edge of the surface where the frame column 1 and the composite grid floor 3 are connected has a The boss has a horizontal connecting plate 12; the upper edge of the corresponding two faces of the lower connecting split body has an arc groove respectively, and the upper edge of the other face of the lower connecting split body has a groove , there is a horizontal connecting plate 12 outward at the edge of the bottom surface of the groove, and a stiffener 17 is installed between the connecting plate 12 and the frame column 1; the upper and lower connecting parts are installed at the intersection of the frame column 1 and the frame side beam 2 At the same time, the frame side beam 2 is buckled in the upper and lower arc-shaped grooves, and at the same time, the boss of the upper connecting split extends into the groove of the lower connecting split, and two horizontal connecting plates 12 are fixed on the together. Groove connectors are shown in Figure 14 and Figure 15. This connector can be manufactured in the factory first and installed on site. When installing, first install the upper connector, then install the lower connector, and then connect the two connectors through bolts 16. Or fixed, because the upper connecting piece can be buckled on the frame edge beam 2, so need not support it, just can directly carry out the installation of the lower connecting piece, more convenient.

As shown in Fig. 17 and Fig. 18, the joint between the frame side beam 2 and the combined grid floor 3 is composed of two connecting pieces 13 that are buckled and welded outside the frame side beam 2. The connecting piece 13 has connecting ears 14, The two connecting parts 13 are fixedly connected by bolts 16 at the connecting ears 14, and the web bar 5 and the connecting ears 14 are welded together.

The construction method of the present invention is as follows: first build frame columns 1, build frame side beams 2 between frame columns 1 to form a building frame, install the joints at the joints between frame columns 1 and composite grid floor slabs, frame side beams 2 and combined The nodes at the joints of the grid floor 3 are welded to the webs 5 at the above nodes, and then the lower chord nodes and the lower chords 6 are connected in sequence to form a grid, and finally the reinforced concrete slab 4 is installed on the grid through the connecting plate, Thereby finish the installation of the combined network frame floor 3 of the bottom, so install other floor slabs successively until the frame construction is completed.

The reinforced concrete slab of the invention can be combined with the grid structure to bear various loads on the floor, and can realize self-supporting in the construction stage.

Claims (1)

1. framework of making floor of the composite space truss structure; It is characterized in that: this framework of making floor of the composite space truss structure is connected and composed by frame column (1), framework side bar (2), composite space truss floor (3), and composite space truss floor (3) in layer is installed in the space that frame column (1) and framework side bar (2) surround; Composite space truss floor (3) is installed together and is formed by web member (5), the lower chord (6) of armored concrete slab (4) and rack; Web member (5) is positioned between armored concrete slab (4) and the lower chord (6); Be fixedly connected web member (5) and junction plate (7) welding between adjacent four armored concrete slabs (4) through junction plate (7) at the place, diagonal angle; Web member (5) is connected through hollow ball node with lower chord (6); Node between frame column (1) and the composite space truss floor (3) inserts and is welded on outside the frame column (1) by upper and lower split type channel-section connecting piece (11) and forms; The lower limb of corresponding two faces of the connection separated body on top respectively has a deep-slotted chip breaker, and the lower limb of an other face of the connection separated body on top has the junction plate (12) of level; The top edge of corresponding two faces of the connection separated body of bottom respectively has a deep-slotted chip breaker, and the top edge of an other face of the connection separated body of bottom has the junction plate (12) of level, between junction plate (12) and the frame column (1) stiffening rib (17) is installed; Node between framework side bar (2) and the composite space truss floor (3) is by make-up and be welded on outer two connectors (13) formation of framework side bar (2); Connector (13) has engaging lug (14); Two connectors (13) are located through bolt at engaging lug (14), and web member (5) welds together with engaging lug.

2, according to claim 1ly do the framework of floor, it is characterized in that: be furnished with presstressed reinforcing steel on the described rack with the composite space truss structure.

3, according to claim 2ly do the framework of floor with the composite space truss structure, it is characterized in that: described frame column (1) adopts the concrete filled square steel tube post, and framework side bar (2) adopts round steel pipe concrete beam.

4, the framework of making floor of the composite space truss structure according to claim 3; It is characterized in that: described presstressed reinforcing steel (8) is two strong point tri linear presstressed reinforcing steels; Two strong point tri linear presstressed reinforcing steels are penetrated in the steel pipe by reinforcing bar and form; Steel pipe is the dovetail groove shape, and the bottom of a level is arranged, and the upper end, bottom is welded with two steel pipe supporting members (9); The two ends of presstressed reinforcing steel are anchored at respectively on the frame column (1), and each steel pipe supporting member (9) and lower chord (6) node on it are fixed together.

5, the framework of making floor of the composite space truss structure according to claim 3; It is characterized in that: described presstressed reinforcing steel (8) is the dual slope presstressed reinforcing steel; The dual slope presstressed reinforcing steel passes two ends, positioning supporting part (10) bottom back by reinforcing bar and is anchored at frame column (1) and goes up and form, and positioning supporting part (10) has the base of a circular arc, and the bottom surface of base is penetrated with groove; The base upper end is welded with the oblique steel pipe of symmetric arrangement, and tiltedly steel pipe and lower chord node are fixed together.

6, the framework of making floor of the composite space truss structure according to claim 3; It is characterized in that: described presstressed reinforcing steel (8) is three strong points, four broken line steel bars; Three strong points, four broken line steel bars pass two ends, positioning supporting part (10) bottom back by reinforcing bar and are anchored at frame column (1) and go up and form; Positioning supporting part (10) has the base of a circular arc; The bottom surface of base is penetrated with groove, and the base upper end is welded with the oblique steel pipe of symmetric arrangement, and tiltedly steel pipe and lower chord (6) node are fixed together; One steel pipe supporting member (9) respectively is set between the two ends of positioning supporting part (10) and reinforcing bar anchoring, and each steel pipe supporting member (9) is fixed between presstressed reinforcing steel (8) and lower chord (6) node.

7, the described job practices of making the framework of floor of the composite space truss structure of a kind of claim 1; It is characterized in that: build frame column (1) earlier; Between frame column (1), build framework side bar (2) and form the building frame; The node of the node of installing frame trestle (1) and composite space truss floor (3) junction, framework side bar (2) and composite space truss floor (3) junction; Weld the web member (5) at above-mentioned node place, and then carry out the connection of lower-chord panel point, lower chord (6) successively and form rack, through junction plate (7) armored concrete slab (4) is installed on the rack at last; Thereby accomplish the installation of the composite space truss floor (3) of the bottom, other each floor plates are installed are so successively accomplished until frame construction.

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