CN201358546Y

CN201358546Y - Prefabricated hollow superposed beam

Info

Publication number: CN201358546Y
Application number: CNU2009200836408U
Authority: CN
Inventors: 刘馨裕
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-09
Filing date: 2009-02-09
Publication date: 2009-12-09
Anticipated expiration: 2019-02-09

Abstract

The utility model relates to a prefabricated hollow superposed beam, belonging to the technical field of building units. A through hole (1) is arranged in the center of the cross section of a beam body (2), and a vertical fiber (4) connected with an erection steel bar (7) is arranged at the upper part of the beam body (2), wherein the erection steel bar (7) is arranged in the beam body (2). By reducing the self weight of the beam body (2), the compression zone of the beam is moved to a board, so that the beam height is greatly increased, the inner space of building structure is not occupied, the overall rigidity of cast-in-situ structure is high, and the suitability for building change is strong; the construction speed for structure assembling is fast, thereby greatly improving the bearing capacity and the structural integrity of the beam; in addition, the beam is suitable for house building with frame structure and high-rise building.

Description

A kind of precast hollow superposed beam

Technical field

The utility model relates to a kind of precast beam, specifically a kind of precast hollow superposed beam.Belong to the concrete prefabricated element technical field,

Background technology

At present, along with improving constantly of people's living standard, personalized design again, top grade and luxurious are also more and more emphasized in house decoration, adapt therewith, and be the frame construction of trend also to the building structure form to create the flexibility and changeability elastic space.The form that frame construction exists mainly is cast-in-situ steel reinforced concrete frame construction, assembling frame structure, and wherein the assembling frame structure mostly is steel work.Because assembling concrete structural element joint adopts " steel bench " formula more, steel using amount is very big, and easily oxidation and form stress and concentrate, and weakens globality.Cast-in-place frame construction good integrity, still, setting up and removing of template and supporting rod not only needs a large amount of artificial, material, but also extremely consuming time.Remove the template recruitment consuming time outside, concrete flexural member such as beam be from being poured onto the fully stressed time effect that also has, and needs indwelling technology interval.Cast-in-place flexural member all is solid because execution conditions and structural restriction, except that super-huge bridge make box, beam in the building construction and plate substantially all are solid.In theory, flexural member is upper portion pressurized on the cross section, the bottom tension, it is idle basically that its middle part is also referred to as the natural axis part, but also increased deadweight, therefore, people usually make and cut down this part invalid concrete in various manners to alleviate deadweight to improve load-carrying ability in the large span rod member.The common simultaneously anti-bending strength that adopts the mode that increases deck-molding to improve beam, but the increase of deck-molding can take the usage space of building structure inside, also influences attractive in appearance.

Summary of the invention

The purpose of this utility model is bigger at invalid deadweight in the existing beam, and deck-molding is subjected to structural limitations, is difficult to defective and deficiencies such as increase, and a kind of precast hollow superposed beam is provided.Its lifting volume is little, simple in structure, easy to assembly, effective, and helps local reinforcement and final grouting to improve integral rigidity.

To achieve these goals, the technical scheme that the utility model is taked is: a kind of precast hollow superposed beam, by reinforcing bar and concrete prefabricated forming, the kernel of section of described beam body is provided with through hole, and the top of described beam body is provided with the vertical fiber that is connected with beam body inner bay stud.

Described through hole is circular hole or the waist circular port that is provided with along beam height degree direction, and the sectional area of described through hole is the long-pending 1/3-2/3 of beam body section.

Described vertical fiber is quadrangle reinforced steel bar ring or the Reinforced hook that is distributed on beam body length direction, or is the spirality stirrup of arranging along beam body length direction, and the height of vertical fiber is more than or equal to the height that is held on precast plate on the beam body.

The top of described beam end of body is provided with negative bending moment rib, one end of negative bending moment rib is connected with the bearing rod of beam body inside, the other end contacts with the top of vertical fiber and stretches out the beam end of body along the length direction of beam body, and bearing rod and main muscle on the described beam body also stretch out the beam end of body.

By technique scheme, the beneficial effects of the utility model are:

1. beam body of the present utility model adopts hollow-core construction, has alleviated the deadweight of beam body member to greatest extent, thereby has improved the load-carrying ability of building.

2. beam body of the present utility model adopts vertical fiber to generate synergistic effect, and the pressure zone of beam is moved to the plate face, makes deck-molding obtain bigger raising, and does not take the inner space of building structure, and except comprehensive cast-in-place structural integral rigidity height, the compliance that building is changed is strong; Outside the fast whole advantages of package assembly speed of application, also improved the load-carrying ability and the structural integrity of beam greatly.

3. prefabricated overlapped hollow beam of the present utility model and precast plate, because of the modularization design of its member and the member production of standard, be convenient to the application of common shake molding technology thereof, the internal friction power that greatly reduces water/binder ratio and utilize highly dense solidity to produce has improved the intensity before the concrete initial set, thereby made things convenient for the tissue of streamline, make things convenient for the concrete at beam natural axis position to cut down, improved load-carrying ability to alleviate deadweight; Because of having improved concrete compactness, and reach the purpose that increases the service life.Beam, the post member of modularization design can adapt to any architectural image, thereby reach the purpose of enriching construction landscape.Because standardization, the seriation of member are designed to the batch production building and have paved road, and batch production production provides convenience to the raising of quality and control, created condition for exempting from decorative architecture, thereby reduced building costs in a large number, shorten the construction period, save constructional materials.The beam of hollow and plate provide good space for again all kinds of steel pipe buried in advance.

4. the utility model is suitable for the assembled on site and the cast of precast beam and precast plate, can guarantee the reliability that beam is connected with precast plate, effectively avoids joint and weld seam exposed oxidation weakening local strength to cause stress to concentrate and the structure damage of generation.Bearing capacity is big, node bonding strength height, and dependable performance, the on-site concrete consumption is less, the efficiency of construction height.

5. the utility model is convenient to the cast-in-place beam and slab structure of making good integrity, is suitable for the building construction of frame construction, also is suitable for highrise building.

Description of drawings

Fig. 1 is the structural representation of the utility model precast hollow superposed beam and precast plate 3 cast-in-place constructions;

Fig. 2 is the structural representation of the utility model precast hollow superposed beam;

Fig. 3 is the another kind of structural representation of the utility model precast hollow superposed beam.

Among the figure: through hole 1, beam body 2, precast plate 3, vertical fiber 4, dowel 5, plate veil sheet muscle 6, bearing rod 7, cast-in-situ concrete layer 8, main muscle 9, negative bending moment rib 10, stirrup 11.

The specific embodiment

The utility model is described in further detail below in conjunction with description of drawings and the specific embodiment:

Referring to Fig. 1, Fig. 2, Fig. 3, a kind of precast hollow superposed beam of the present utility model, by reinforcing bar and concrete prefabricated forming, the kernel of section of described beam body 2 is provided with through hole 1, and the top of described beam body 2 is provided with the vertical fiber 4 that is connected with beam body 2 inner bay studs 7.

Described through hole 1 is circular hole or the waist circular port that is provided with along beam body 2 short transverses, and to reduce the entity space at beam body 2 natural axis positions as much as possible, the sectional area of common described through hole 1 is the 1/3-2/3 of beam body 2 sectional areas.Through hole 1 on the described beam body 2 can alleviate deadweight to greatest extent and improve load-carrying ability and reduce the inactive material ratio.

As Fig. 1, shown in Figure 3, described vertical fiber 4 is for being distributed on the quadrangle reinforced steel bar ring or the Reinforced hook of beam body 2 length directions, or as Fig. 1, shown in Figure 2, be the spirality stirrup of arranging along beam body 2 length directions, the height of vertical fiber 4 is more than or equal to the height that is held on precast plate 3 on the beam body 2.As shown in Figure 1, described vertical fiber 4 can effectively transmit stress, make vertical fiber 4 tops after plane on the beam body 2 of pressure zone when making rises to assembling, as its cross section calculated height of Fig. 1 also beam body 2 Level Changes when making is height behind the beam body 2 height+beam bodies 2 upper pouring concrete of assembling after cast-in-place, thereby prolonged the interior arm of force widely, improved the moment of flexure value.

The top of described beam body 2 ends is provided with negative bending moment rib 10, one end of negative bending moment rib 10 is connected with the bearing rod 7 of beam body 2 inside, be generally welding, the other end contacts with the top of vertical fiber 4 and stretches out beam body 2 ends along the length direction of beam body 2, and bearing rod 7 on the described beam body 2 and main muscle 9 also stretch out beam body 2 ends.So that be connected when cast-in-place with the beam body 2 of cylinder and butt joint.

As Fig. 1, Fig. 2, shown in Figure 3, the rigidity requirement when bearing rod 7 only satisfies the member rotation gets final product, and 10 spans according to beam of negative bending moment rib change; 9 in the main muscle of beam body 2 is different because of the use moment of flexure; The diameter of beam body 2 inner stirrups 11 and spacing are determined by maximum shear.

The cast-in-situ construction method of the utility model precast hollow superposed beam and precast plate may further comprise the steps:

A. the both sides, plane are shelved precast plate 3 relatively on beam body 2, reserve poured joint between precast plate 3 and vertical fiber 4;

B. 3 joint fluid concretes of the precast plate on beam body 4, until burying vertical fiber 4, or above beam body 2 and precast plate 3 integrated poured concrete, shake is smash, and is floating, after maintenance is solidified, cast-in-situ beam slab.The layer of concrete of being poured into a mould 8 can adopt be higher than a grade strength of prefabricated component exempt to shake little swollen concrete.Described layer of concrete 8 also comprises on the beam body 4 concrete cast-in-place on the plane.In the cast-in-situ concrete process, concrete can laterally flow in the hollow hole of precast plate 3 ends, both sides, and this will stiffening girder body 2 and being connected of both sides precast plate 3.

In the described steps A: with main muscle relative on the beam body 2 both sides precast plates 39 mutual cross-lappings.Make the connection of two precast plates, 3 ends more firm.

In the described steps A: wear and tie up link bar 5 along the length direction of beam body 2 at the inner top of vertical fiber 4.To strengthen vertical connection at vertical fiber 4 tops.

In the described steps A: on the relative precast plate 3 in beam body 2 both sides, lay plate veil sheet muscle 6, the uniform reinforcing bar that passes vertical fiber 4 and beam body 2 tops that is provided with on the described plate veil sheet muscle 6.The diameter and the spacing of vertical fiber 4 and plate veil sheet muscle 6 are fixed, and only satisfy structure and require minimum steel ratio 0.2% in the scope of cross section, and therefore, the bar diameter of direction might not equate in length and breadth, should be reference object with the plate, calculate and determine diameter and spacing.Generally speaking, 3 millimeters of the longitudinal rib diameters of plate face steel mesh reinforcement 6,500 millimeters of spacings, 4 millimeters of horizontal bar diameters, 300 millimeters of spacings.3 millimeters of the diameters of vertical fiber 4,150 millimeters of spacings.

Claims

1. precast hollow superposed beam, by reinforcing bar and concrete prefabricated forming, it is characterized in that: the kernel of section of described beam body (2) is provided with through hole (1), and the top of described beam body (2) is provided with the vertical fiber (4) that is connected with beam body (2) inner bay stud (7).

2. a kind of precast hollow superposed beam according to claim 1 is characterized in that: described through hole (1) is circular hole or the waist circular port that is provided with along beam body (2) short transverse, and the sectional area of described through hole (1) is the 1/3-2/3 of beam body (2) sectional area.

3. a kind of precast hollow superposed beam according to claim 1, it is characterized in that: described vertical fiber (4) is for being distributed on the quadrangle reinforced steel bar ring or the Reinforced hook of beam body (2) length direction, or be the spirality stirrup of arranging along beam body (2) length direction, the height of vertical fiber (4) is gone up the height of precast plate (3) more than or equal to being held on beam body (2).

4. a kind of precast hollow superposed beam according to claim 1, it is characterized in that: the top of described beam body (2) end is provided with negative bending moment rib (10), one end of negative bending moment rib (10) is connected with the bearing rod (7) of beam body (2) inside, the other end contacts with the top of vertical fiber (4) and stretches out beam body (2) end along the length direction of beam body (2), and bearing rod (7) on the described beam body (2) and main muscle (9) also stretch out beam body (2) end.