CN216787590U - Prestressed concrete truss superimposed sheet - Google Patents

Abstract

The application discloses prestressed concrete truss superimposed sheet relates to the technical field of construction, has improved the relatively poor problem of pouring effect when pouring from pipe both ends towards the cavity, and it includes truss and concrete slab, the bottom of truss is buried underground inside concrete slab, the truss includes the chord member, set up the sprue gate that supplies the stopping to pour into on the chord member, the inside cavity that supplies the stopping to fill that has of chord member, the sprue gate communicates with each other with the cavity. This application can make things convenient for constructor to pour into a mould to the inside of upper chord cavity, improves the pouring effect of pouring in the upper chord cavity to improve the structural strength of upper chord, shorten prestressed concrete truss superimposed sheet's preparation time limit for a project.

Description

Prestressed concrete truss superimposed sheet

Technical Field

The application relates to the technical field of building construction, in particular to a prestressed concrete truss composite slab.

Background

In recent years, a large number of concrete truss composite slabs are used in the construction industry, and the product can reduce wet operation steps and the using amount of construction templates and scaffolds in the construction process, reduce labor consumption, reduce construction difficulty and improve construction efficiency.

Chinese patent application publication No. CN105756252A discloses a prestressed concrete truss composite slab, which comprises a concrete bottom plate, a truss is arranged on the concrete bottom plate, the truss comprises an upper chord, and the upper chord is a cylindrical steel pipe. And filling materials are poured into the inner cavity of the steel pipe of the upper chord. The first prestressed reinforcement of the truss is pre-embedded in the hard filler, and the length direction of the first prestressed reinforcement of the truss is parallel to the length direction of the upper chord.

In the above mentioned patent, the outer diameter of the steel pipe of the upper chord is 45mm, the wall thickness of the steel pipe is 12mm, the prestressed steel bar with the diameter of 5.6mm is penetrated into the cavity of the steel pipe, and the filling material is poured into the cavity. In the process that the filling material is poured into the cavity from two sides of the steel pipe, two sides of the steel pipe need to be simultaneously plugged to prevent slurry leakage, and due to the fact that the prestressed steel bars penetrate through the cavity, two sides of the steel pipe are generally not tightly plugged, and slurry leakage is easy to occur. In addition, the filling materials in the cavity are easy to be not compact by pouring from two sides of the steel pipe into the cavity, so that gaps are easy to exist in the cavity, the bond stress between the prestressed steel bars and the surrounding filling materials is poor, the pouring is difficult to guarantee even if micro-expansion high-strength mortar is used, and the due effect of the laminated slab can not be achieved after the prestressed steel bars are subjected to prestress.

SUMMERY OF THE UTILITY MODEL

The application provides a prestressed concrete truss superimposed sheet for improving the problem that the casting effect is relatively poor when pouring from pipe both ends in towards the cavity.

The application provides a prestressed concrete truss superimposed sheet adopts following technical scheme:

the utility model provides a prestressed concrete truss superimposed sheet, includes truss and concrete slab, the bottom of truss is buried underground inside concrete slab, the truss includes the upper chord, set up the sprue gate that supplies the stopping to pour into on the upper chord, the inside cavity that supplies the stopping to fill that has of upper chord, the sprue gate communicates with each other with the cavity.

Through adopting above-mentioned technical scheme, the sprue gate has been seted up at the upper chord top, can make things convenient for the staff to pour into a mould the stopping in the upper chord cavity, and the pouring stopping can improve the structural strength of upper chord, pour into a mould from the sprue gate and can make things convenient for the staff to carry out the shutoff leak protection at the both ends of upper chord, and can improve the pouring effect, make the stopping after the pouring more closely knit, reduce the probability in space appears in the stopping after the pouring, can also make things convenient for the staff to decide whether need pour into a mould the stopping in the cavity according to the atress condition of upper chord simultaneously.

Optionally, a first prestressed reinforcement for improving the structural strength of the upper chord member penetrates through the cavity.

Through adopting above-mentioned technical scheme, have stronger bond stress between first prestressing steel and the filler, can further improve the structural strength of upper chord, can also make things convenient for the staff to wear to establish first prestressing steel according to the atress condition decision of upper chord in the cavity simultaneously.

Optionally, the top chord has all extended the web member towards both sides, the web member extends towards the direction that is close to concrete slab, just lean out when the web member downwardly extending, the one end that the top chord was kept away from to the web member is buried underground in concrete slab, a plurality of second prestressing steel that are used for improving concrete slab structural strength have been buried underground in concrete slab, the web member is connected with second prestressing steel.

Through adopting above-mentioned technical scheme, can improve the joint strength between upper chord and the concrete slab, improve concrete slab's self structural strength simultaneously.

Optionally, the pouring gate is located at an end of the upper chord remote from the slab.

By adopting the technical scheme, the concrete slab and the upper chord member can be simultaneously poured, and the manufacturing period of the prestressed concrete truss composite slab is shortened.

Optionally, the upper chord is made of a steel pipe, the pouring gate is provided with a plurality of pouring gates, the plurality of pouring gates are arranged in the middle of the upper chord, and the plurality of pouring gates are distributed at intervals along the axial direction of the upper chord.

Through adopting above-mentioned technical scheme, the steel pipe is convenient for draw materials, and the position of sprue gate is convenient for pour into a mould, and does not interfere the shutoff leak protection at upper chord both ends when pouring into a mould.

Optionally, the upper chord is made of half-cut steel pipes and then spliced.

By adopting the technical scheme, the steel pipe automatically forms the sprue gate after half cutting, the sprue gate does not need to be additionally arranged, and the using amount of the steel pipe can be reduced.

Optionally, the upper chord is made of angle steel.

Through adopting above-mentioned technical scheme, the angle steel is convenient for draw materials, and the opening of angle steel itself is the sprue gate promptly, need not to set up in addition, has shortened the time of upper chord processing, has reduced the processing cost of upper chord simultaneously.

Optionally, the upper chord is made of channel steel.

Through adopting above-mentioned technical scheme, the channel-section steel is convenient for draw materials with the angle steel equally, and self takes the sprue gate, can shorten the time of upper chord processing and reduce the processing cost of upper chord, can also improve the firm effect of peripheral stopping to first prestressing steel in addition, improves the bond stress between first prestressing steel and the peripheral stopping simultaneously.

In summary, the present application includes at least one of the following benefits:

1. the filler is poured into the cavity of the upper chord member through the pouring gate, so that the pouring of workers can be facilitated, the workers can conveniently plug the two ends of the upper chord member at the same time, the filler is more compact in the cavity, the occurrence of gaps is reduced, the bond stress between the first prestressed reinforcement and the peripheral filler is improved, and the pouring quality in the cavity of the upper chord member is improved;

2. the concrete slab and the cavity of the upper chord member are simultaneously cast and molded, so that the manufacturing period of the prestressed concrete truss composite slab can be shortened, and simultaneously, prestress is simultaneously applied to two ends of the first prestressed reinforcement and the second prestressed reinforcements, so that the integral stress is more balanced, the problem that the other side is cracked due to single-side tensioning of the bottom of the plate is solved, and the integral quality of the plate is improved;

3. the upper chord member can select whether to pour the filling material and whether to wear to establish the first prestressed reinforcement according to the stress condition, so that the manufacturing process of the prestressed concrete truss composite slab is more flexible, and the construction work time is more reasonable.

Drawings

FIG. 1 is a cross-sectional view of a composite panel according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of an embodiment of the present application in which the upper chord is formed as a circular tube;

FIG. 3 is a cross-sectional view of an embodiment of the present application in which the upper chord is formed as a semi-circular tube;

FIG. 4 is a cross-sectional view of an upper chord of an embodiment of the present application when formed of angle steel;

FIG. 5 is a cross-sectional view of an embodiment of the present application in which the top chord is formed from channel steel;

fig. 6 is a cross-sectional view of the upper chord of the present embodiment without the first pre-stressing tendons inserted therein;

FIG. 7 is a cross-sectional view of the upper chord of the present embodiment without the first pre-stressed steel bars nor the filler material being inserted therein;

FIG. 8 is a cross-sectional view of an embodiment of the present application with the top chord gate facing down.

Description of reference numerals: 1. a truss; 11. an upper chord; 111. a cavity; 112. a pouring gate; 12. a web member; 13. a first prestressed reinforcement; 2. a concrete slab; 3. a steel bar structure; 31. a second prestressed reinforcement; 32. a second transverse reinforcement bar; 33. a first transverse reinforcement bar; 4. and (3) a filling material.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses prestressed concrete truss superimposed sheet.

Referring to fig. 1, the prestressed concrete truss composite slab includes a truss 1 and a concrete slab 2, and the bottom of the truss 1 is buried in the concrete slab 2 to connect the truss 1 with the concrete slab 2.

The concrete slab 2 is a plate-shaped structure, the concrete slab 2 is internally provided with a reinforced bar structure 3, and the concrete slab 2 is cast in a special concrete mould. After the bottom of the truss 1 is connected with a steel bar structure 3 inside a concrete slab 2, filling materials 4 are poured into a concrete mold to form the concrete slab 2.

Referring to fig. 1 and 2, the truss 1 includes an upper chord 11, a first prestressed reinforcement 13, and a web member 12, wherein a cavity 111 for the first prestressed reinforcement 13 to pass through penetrates through the upper chord 11 along the length direction thereof. After the first prestressed reinforcement 13 passes through the cavity 111 of the upper chord 11, the filler 4 is poured into the cavity 111 to position the first prestressed reinforcement 13 in the cavity 111.

Two web members 12 are provided with altogether, and two web members 12 set up respectively in the both sides of upper chord 11, and two web members 12 keep away from the one end of upper chord 11 and are connected with concrete slab 2 inside steel bar structure 3, and lean out when two web members 12 extend towards being close to concrete slab 2 inside steel bar structure 3, and two web members 12 set up for upper chord 11 symmetry. In this embodiment, the web member 12 and the reinforcing structure 3 inside the concrete slab 2 are both steel structures, and therefore, the connection method thereof is preferably welding.

The upper chord 11 is provided with a pouring port 112 for the filling material 4 to be poured into the cavity 111, and after the first prestressed reinforcement 13 passes through the cavity 111, the two sides of the cavity 111 are sealed at the two ends of the upper chord 11 so that the filling material 4 can be poured from the pouring port 112. Because the first prestressed reinforcement 13 penetrates through the cavity 111, the sealing performance for plugging the two ends of the upper chord 11 is inevitably poor, so that the filler 4 is injected into the cavity 111 from a position close to the middle of the upper chord 11 through the pouring port 112 during pouring, filling and pouring, the filler 4 flows towards the two ends of the upper chord 11 along the cavity 111, and the filler 4 is filled into the two ends of the upper chord 11 at the same time, so that the leakage of the filler 4 can be reduced as much as possible.

In order to make the pouring inside the cavity 111 of the upper chord 11 more convenient and faster and to reduce the processing cost, the upper chord 11 can be made of materials commonly used in different construction sites.

Referring to fig. 1 and 2, the upper chord 11 may be made of a circular tube. Two web members 12 are connected with the both ends of upper chord 11 radial direction respectively, and a plurality of pouring gates 112 of being convenient for the pouring are seted up along its self length direction to the one end that reinforcing bar structure 3 was kept away from to upper chord 11, for making things convenient for constructor in the pipe upper shed, and pouring gate 112 is preferred round mouth. The round pipe is a common metal material in building construction, is convenient to obtain and is convenient to process.

Referring to fig. 1 and 3, on the basis of the above, the upper chord 11 can also be made in a material-saving manner, and a round pipe is also selected, and after the round pipe is cut in half, two sections of semi-round pipes are aligned and connected end to form a new upper chord 11. After the upper chord 11 is manufactured, the two web members 12 are respectively connected with the bottom of the upper chord 11 near the two sides. Compared with the method, the method has the advantages that the manufacturing materials of the upper chord 11 are fully utilized, the processing is simple, the pouring gate 112 is greatly enlarged, the constructor can pour the filling material 4 from any position in the length direction of the upper chord 11, the constructor can conveniently observe the filling condition of the filling material 4 in the cavity 111, and the pouring process inside the cavity 111 of the upper chord 11 can be easier and more convenient.

Referring to fig. 1 and 4, in addition, the upper chord 11 can also be made of angle steel, and the angle steel has the advantage of being used without other processing compared with round steel. The opening on the angle steel is upward and automatically used as a pouring gate 112, and the two web members 12 are respectively connected with two end faces of the angle steel, which are far away from the opening. The upper chord 11 made of the angle steel is similar to the upper chord 11 made of the semicircular pipe, the pouring gate 112 is also enlarged, so that the filler 4 can be conveniently poured into the cavity 111 of the upper chord 11 by constructors, and the angle steel is also a common metal material in building construction.

Referring to fig. 1 and 5, similar to angle steel, channel steel is also suitable for manufacturing the upper chord 11, and channel steel is also common in building construction, and can be directly used without additional processing. The opening of channel-section steel is up, and two web members 12 are connected with the both sides of channel-section steel respectively, and pouring gate 112 enlarges on the upper chord 11 that the channel-section steel was made equally, makes things convenient for constructor to pour into a mould inside upper chord 11 cavity 111. Compared with the upper chord 11 made of angle steel, the upper chord 11 made of channel steel has the advantages that the cavity 111 of the channel steel can contain more fillers 4, the thickness of the fillers 4 on the periphery of the first prestressed steel bar 13 is increased, the bond stress between the first prestressed steel bar 13 and the fillers 4 on the periphery can be improved, and meanwhile, the overall structural strength of the upper chord 11 can be improved.

In other embodiments, the upper chord 11 may be made of other materials, and for convenience of description, the upper chord 11 made of angle steel is preferably illustrated in the following figures.

Referring to fig. 1 and 4, when the concrete slab 2 is poured, the pouring in the cavity 111 of the upper chord 11 can be simultaneously carried out, and the upper layer and the lower layer are not needed to be poured, so that the construction period of the composite slab is saved.

Referring to fig. 1, steel bar structure 3 includes a plurality of second prestressed reinforcement 31 and a plurality of horizontal reinforcing bar, and a plurality of second prestressed reinforcement 31 all are on a parallel with first prestressed reinforcement 13 setting, and a plurality of second prestressed reinforcement 31 along the equidistant distribution of horizontal direction. The second prestressed reinforcement 31 has the greatest influence on the structural strength of the concrete slab 2 after being manufactured, so that in the process of pouring the filler 4 into the reinforced structure 3 to form the concrete slab 2, a reinforcement tensioning machine is required to apply tension to both ends of the second prestressed reinforcements 31 along the axial direction thereof.

Similarly, the first prestressed reinforcement 13 in the upper chord 11 also needs to be pulled by a reinforcement tensioning machine, when the concrete slab 2 and the cavity 111 of the upper chord 11 are poured simultaneously, the two ends of the first prestressed reinforcement 13 and the second prestressed reinforcement 31 are also pulled by the reinforcement tensioning machine simultaneously, so that the tension of the reinforcement tensioning machine on the superposed slab is more balanced, and the problem that the other side is cracked due to the unilateral tensioning of the reinforcement tensioning machine on the first prestressed reinforcement 13 or the second prestressed reinforcement 31 is avoided.

The plurality of transverse steel bars are horizontally arranged and are perpendicular to the second prestressed steel bars 31, and the plurality of transverse steel bars are connected with the plurality of second prestressed steel bars 31 in a spot welding mode. The transverse reinforcement includes first transverse reinforcement 33 and second transverse reinforcement 32, and first transverse reinforcement 33 sets up in the one side that the upper chord 11 was kept away from to second prestressed reinforcement 31, and second transverse reinforcement 32 sets up in the one side that second prestressed reinforcement 31 is close to upper chord 11.

Referring to fig. 1, the web member 12 has a wave-shaped structure extending in the longitudinal direction of the upper chord 11, and waves and the like are periodically distributed on the web member 12. One end of the web member 12 close to the steel bar structure 3 is a bending position of the wave structure, and the first transverse steel bars 33 are respectively connected with one ends of the web member 12 close to the upper chord 11 at a plurality of bending positions. A plurality of second transverse reinforcement 32 are close to the both ends of second prestressing steel 31 respectively, and a plurality of first transverse reinforcement 33 and a plurality of second transverse reinforcement 32 cooperation, when pressing from both sides tight location with second prestressing steel 31, second prestressing steel 31 is difficult to take place bending deformation in the vertical direction, has improved the holistic structural strength of concrete slab 2.

When the concrete slab 2 and the cavity 111 of the upper chord 11 are poured, the two ends of the first prestressed reinforcement 13 and the two ends of the second prestressed reinforcement 31 are respectively located at the two sides of the outer part of the upper chord 11 and the two sides of the concrete mold, and after the pouring is finished, the two ends of the first prestressed reinforcement 13 and the two ends of the second prestressed reinforcement 31 exposed outside are cut off by a constructor.

In addition, the upper chord 11 has different states according to the stress condition of itself during specific construction, which is as follows:

referring to fig. 1 and 6, the first prestressed reinforcement 13 does not penetrate through the cavity 111 of the upper chord 11, so that the difficulty of pouring after the first prestressed reinforcement 13 penetrates through the cavity is reduced, the trouble of simultaneously applying prestress on the first prestressed reinforcement 13 and the second prestressed reinforcement 31 is also eliminated, and the manufacturing period of the prestressed concrete truss composite slab is shortened;

referring to fig. 1 and 7, the cavity 111 of the upper chord 11 can be provided with neither the first prestressed reinforcement 13 nor the filling material 4, so that the time for pouring the filling material 4 in the cavity 111 of the upper chord 11 is saved on the basis of the above state, and the manufacturing period of the prestressed concrete truss composite slab is further shortened;

referring to fig. 1 and 8, the connection direction of the upper chord 11 and the web members 12 may be adjusted, and depending on the force applied to the upper chord 11, the upper chord 11 may be connected to the web members 12 in a state where the gate 112 is located away from the concrete slab 2, or may be connected to the web members 12 in a state where the gate 112 is located close to the concrete slab 2.

The implementation principle of the prestressed concrete truss composite slab in the embodiment of the application is as follows:

firstly, an upper chord member 11 with a pouring port 112 is made of a proper material, then two web members 12 are connected with two sides of the upper chord member 11, then a plurality of second prestressed reinforcements 31 are placed in a concrete mold side by side, meanwhile, a first prestressed reinforcement 13 is arranged in a cavity 111 of the upper chord member 11 in a penetrating mode, then, a reinforcement tensioning machine is used for exerting tension on two ends of the first prestressed reinforcement 13 and the second prestressed reinforcement 31 to enable the first prestressed reinforcement 13 and the second prestressed reinforcement 31 to be tensioned and positioned, then a plurality of first transverse reinforcements 33 and a plurality of second transverse reinforcements 32 are placed in the concrete mold, a plurality of first transverse reinforcements 33 penetrate through a wave structure of the web members 12 and are connected with bending positions of the web members 12, then the plurality of first transverse reinforcements 33 and the plurality of second transverse reinforcements 32 are connected with the plurality of second prestressed reinforcements 31, then, a filling material truss 4 is poured into the concrete mold and the cavity 111 of the upper chord member 11 at the same time, and then, and a prestressed concrete stack can be made up Plywood;

the material selected by the upper chord 11, the position state of the upper chord 11 connected with the web member 12, whether the first prestressed reinforcement 13 is arranged in the cavity 111 of the upper chord 11 in a penetrating way, and whether the filling material 4 is poured in the cavity 111 of the upper chord 11 are all selected according to the stress condition of the filling material.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The prestressed concrete truss composite slab is characterized by comprising a truss (1) and a concrete slab (2), wherein the bottom of the truss (1) is embedded in the concrete slab (2), the truss (1) comprises an upper chord (11), a pouring gate (112) for filling a filling material (4) is formed in the upper chord (11), a cavity (111) for filling the filling material (4) is formed in the upper chord (11), and the pouring gate (112) is communicated with the cavity (111).

2. A prestressed concrete truss composite slab as claimed in claim 1, wherein said cavity (111) is penetrated with first prestressed reinforcements (13) for improving the structural strength of the upper chord (11).

3. A prestressed concrete truss composite slab according to claim 2 wherein said upper chord member (11) is extended with web members (12) toward both sides, said web members (12) are extended toward the direction close to the concrete slab (2), and said web members (12) are extended downward while being inclined outward, and the end of said web members (12) far from the upper chord member (11) is embedded in the concrete slab (2), and said concrete slab (2) is embedded with a plurality of second prestressed reinforcing bars (31) for improving the structural strength of the concrete slab (2), and said web members (12) are connected with the second prestressed reinforcing bars (31).

4. A prestressed concrete truss composite slab as claimed in claim 2 wherein said pouring opening (112) is located at the end of the upper chord (11) remote from the slab (2).

5. The prestressed concrete truss composite slab as claimed in claim 2, wherein said upper chord member (11) is made of steel pipe, said plurality of pouring openings (112) are provided, a plurality of pouring openings (112) are provided at the middle position of the upper chord member (11), and a plurality of pouring openings (112) are spaced along the axial direction of the upper chord member (11).

6. The prestressed concrete truss composite slab as claimed in claim 5, wherein said upper chord member (11) is made by half-cutting and splicing steel pipes.

7. A prestressed concrete truss composite according to claim 5 wherein said upper chord member (11) is made of angle steel.

8. A prestressed concrete truss composite according to claim 7 wherein said upper chord member (11) is made of channel steel.

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