CN217812010U - Prefabricated staircase connection structure - Google Patents

Abstract

The utility model discloses a prefabricated staircase connecting structure, the two ends of the prefabricated staircase are provided with platform sections, and the platform sections are provided with platform grooves; the superposed ladder beam comprises a concave superposed bottom beam and a cast-in-place connecting section, the top surface of the concave superposed bottom beam is provided with a bottom beam groove, the cast-in-place connecting section is positioned in the platform groove and the bottom beam groove, and the concave superposed bottom beam and the cast-in-place connecting section and the platform section of the prefabricated staircase form a ladder beam whole body to play a supporting function; the connecting node has excellent comprehensive performance and good safety and reliability, is convenient for the installation of the precast concrete stairs, and improves the assembly level and the efficiency of the building structure; the cast-in-place structure is converted into a prefabricated component single body, so that the prefabricated component single body is convenient to process in a component factory; t-shaped steel plate embedded parts can be adopted, so that the workload of concrete cast-in-place wet operation is reduced, and the connecting work difficulty is reduced; and the T-shaped steel plate embedded part is more suitable for factory standardized production, and is favorable for quality control of the prefabricated part.

Description

Prefabricated staircase connection structure

Technical Field

The utility model relates to an assembly type structure connects technical field, specifically is a prefabricated staircase connection structure.

Background

In recent years, the application of the fabricated concrete structure in the field of house construction is wider, and the construction quality and the construction efficiency are effectively improved; materials are saved, energy is saved, emission is reduced, environment is protected, labor force is saved, and labor conditions are improved; the construction period is shortened, the winter construction is convenient, and the like, so that the method plays a main role in building industrialization in China.

In the fabricated concrete member, the vertical connection of the precast concrete stairway is one of the key technologies. The connecting node of the precast concrete component is a weak link of the prefabricated concrete structure, the ladder beam in the precast concrete stair component is a key for connection, the mature and reliable node connecting technology is a key for ensuring the integrity and the safety of the prefabricated concrete structure, and the superior precast concrete component connecting technology has the characteristics of safe and reliable connection, simple and easy production, transportation and construction and low cost, and is a development direction for high-efficiency connection of the precast concrete components.

The connected mode that is commonly used to the assembled concrete stair at present stage is bolted connection, and bolted connection has the construction conveniently, and the extensive advantage of range of application, but bolted connection need move the ladder roof beam rethread of original structural design to change into L type ladder roof beam, changed original structural design, increased the width and the risk of toppling of ladder roof beam. And when the bolt hinged joint was in the conflagration, the bolt directly exposed in high temperature air easily, led to warp and lose bearing capacity, and then caused the accident.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a prefabricated staircase connection structure, it combines superimposed structure to connect the principle and water worker's method after with, makes its comprehensive properties good.

The utility model discloses a prefabricated staircase connection structure, including prefabricated staircase and coincide ladder beam, prefabricated staircase sets up the platform section, and the platform section sets up the platform recess; the superposed ladder beam comprises a concave superposed bottom beam and a cast-in-place connecting section, the concave superposed bottom beam is provided with a bottom beam groove, the cast-in-place connecting section is positioned in the platform groove and the bottom beam groove, and the concave superposed bottom beam and the cast-in-place connecting section form a ladder beam whole with the platform section of the prefabricated staircase.

Furthermore, the concave superposed bottom beam and the cast-in-place connecting section form a ladder beam whole body with the platform section of the prefabricated staircase through a T-shaped steel plate, and the T-shaped steel plate comprises wing plates on two transverse sides and vertical webs which are connected.

More closely, T shaped steel board includes first T shaped steel board and second T shaped steel board, and first T shaped steel board is positive T type, and second T shaped steel board is the type of falling T, and the web of the two is connected and all is connected with cast-in-place linkage segment, and the pterygoid lamina and the platform section of first T shaped steel board are connected, and the pterygoid lamina and the concave type coincide floorbar of second T shaped steel board are connected.

Furthermore, a longitudinal structure steel bar and a stirrup are arranged in the concave type superposed bottom beam, and the stirrup is hooped on the outer side of the longitudinal structure steel bar.

Furthermore, a transverse joint is arranged between the concave superposed bottom beam and the bottom of the platform section of the prefabricated staircase, cement mortar is filled in the transverse joint, and cement mortar is filled in the bottom beam groove and the platform groove.

Furthermore, a unfilled corner is reserved in the prefabricated staircase, the floor cast-in-place rest platform is provided with steps, the unfilled corner is matched and lapped at the steps, a gap is formed between the side surface of the unfilled corner and the side surface of the steps of the floor cast-in-place rest platform, and a waterproof sealing layer is arranged in the gap.

Furthermore, waterproof structures are paved at the bottoms of the unfilled corners.

Further, the waterproof blocking layer comprises one or two or all three of a filled polyphenyl layer, a PE rod, an injection blocking glue layer.

Furthermore, the cross section of the cast-in-place connecting section is cross-shaped, the middle transverse part of the cast-in-place connecting section forms a platform plate, the upper part of the cast-in-place connecting section is positioned in the platform groove, and the lower part of the cast-in-place connecting section is positioned in the bottom beam groove.

Still further, the waterproof structure includes an oil felt layer or/and a cement mortar leveling layer.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a prefabricated staircase connection structure, its connected node comprehensive properties is good, and fail safe nature is good, and the prefabricated concrete stair's of being convenient for installation improves building structure's level of assembling.

2. The utility model discloses a prefabricated staircase connection structure, its cast-in-place structure turns into the prefabricated component monomer and is convenient for the processing of component factory.

3. The prefabricated staircase connecting structure of the utility model can adopt T-shaped steel plate embedded parts, thereby not only reducing the workload of concrete cast-in-place wet operation, but also reducing the difficulty of connecting work; and the T-shaped steel plate embedded part is more suitable for factory standardized production, and is favorable for quality control of the prefabricated part.

Drawings

Fig. 1 is a schematic view of a single structure of a prefabricated staircase according to an embodiment of the present invention;

fig. 2 is a schematic sectional view of the prefabricated staircase according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a T-shaped steel plate according to an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of the prefabricated staircase portion of FIG. 1;

FIG. 5 is a schematic cross-sectional view of the overlapping sill portion of FIG. 1;

FIG. 6 is an enlarged view of a portion A of FIG. 2;

fig. 7 is a partially enlarged view of fig. 2 at B.

In the figure: 1-1 is a first T-shaped steel plate, 1-2 is a first rib penetrating hole, 2-1 is a second T-shaped steel plate, 2-2 is a second rib penetrating hole, 3 is a prefabricated staircase, 301 is a platform section, 302 is a platform groove, 303 is a unfilled corner, 304 is a linoleum layer, 305 is a cement mortar leveling layer, 306 is a filled polystyrene layer, 307 is a filled PE rod, 308 is an injected plugging glue layer, 4 is a concave laminated bottom beam, 401 is a cast-in-place connecting section, 402 is a bottom beam groove, 5 is a first longitudinal stressed fixed steel bar, 6 is a second longitudinal stressed fixed steel bar, 7 is a stirrup, 8 is a longitudinal structural steel bar, 9 is cement mortar, 10 is a longitudinal connecting steel bar and 11 is a floor cast-in-place rest platform.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Example 1

Referring to fig. 1, the prefabricated staircase connection structure comprises a prefabricated staircase 3 and a superposed staircase beam, wherein the prefabricated staircase 3 is provided with a platform section 301, and the platform section 301 is provided with a platform groove 302; referring to fig. 2, the overlapped ladder beam comprises a concave overlapped bottom beam 4 and a cast-in-place connecting section 401, the concave overlapped bottom beam 4 is provided with a bottom beam groove 402, the cast-in-place connecting section 401 is positioned in the platform groove 302 and the bottom beam groove 402, and the concave overlapped bottom beam 4 and the cast-in-place connecting section 401 and the platform section 301 of the prefabricated staircase 3 form a ladder beam whole.

Aiming at the connection of the traditional prefabricated staircase 3 and the superposed ladder beams, the rectangular superposed ladder beams are moved for a distance in the direction far away from the platform section 301 of the prefabricated staircase 3, and the rectangular superposed ladder beams are changed into L-shaped ladder beams, so that the width of the ladder beams is increased, the space between staircases is reduced, the collision risk is increased, the lateral bending moment and the torque of the superposed ladder beams are easily overlarge, and the overturning risk of the superposed ladder beams is increased; in addition, when the traditional prefabricated staircase 3 is hinged with the bolts of the superposed ladder beams in a fire, the bolts are easily and directly exposed in high-temperature air, so that the deformation and the loss of the bearing capacity are caused, and further accidents and other problems are caused; the prefabricated staircase connection structure of this embodiment, based on the simple and easy needs of precast concrete stair structure safety and actual construction, through utilizing superimposed structure, need not to change superimposed ladder beam position, structure and size, is concave type superimposed sill 4 and the cast-in-place linkage segment 401 of rectangle with the superimposed ladder beam split of rectangle to platform section 301 with prefabricated staircase 3 connects into whole, and the effect is born to the superimposed ladder beam structure of exerting jointly.

The prefabricated staircase connection structure of this embodiment for the pre-buried bolted connection structure of traditional coincide ladder beam, can save processes such as template is strutted, the reinforcing bar is helped, concrete placement, reduces the site operation, improves the efficiency of construction.

Wherein can be, prefabricated staircase 3 is prefabricated reinforced concrete stair. The cross section of the superposed ladder beam is rectangular. Referring to fig. 3, the land groove 302 is a rectangular groove. Referring to fig. 4, the sill groove 402 is a rectangular groove.

Referring to fig. 6, in other embodiments, the cast-in-place connector section 401 is cross-shaped in cross-section with a central transverse portion forming a platform plate.

In other embodiments, cast-in-place connector 401 is positioned with an upper portion within platform recess 302 and a lower portion within sill recess 402.

In some embodiments, the concave laminated bottom beam 4 and the cast-in-place connecting section 401 are integrated with the platform section 301 of the prefabricated staircase 3 by a T-shaped steel plate, which includes a wing plate and a vertical web plate connected at both lateral sides, as shown in fig. 3.

Referring to fig. 6, in some embodiments, the T-shaped steel plate includes a first T-shaped steel plate 1-1 and a second T-shaped steel plate 2-1, the first T-shaped steel plate 1-1 is a positive T-shape, the second T-shaped steel plate 2-1 is an inverted T-shape, webs of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 are connected and both connected to a cast-in-place connecting section 401, a wing plate of the first T-shaped steel plate 1-1 is connected to a platform section 301, and a wing plate of the second T-shaped steel plate 2-1 is connected to a concave laminated bottom beam 4.

The prefabricated staircase connection structure of this embodiment splits the coincide ladder beam of rectangle into concave type coincide floorbar 4 and the cast-in-place linkage segment 401 of rectangle to pass through first T shaped steel board 1-1 and second T shaped steel board 2-1 with the platform section 301 of prefabricated staircase 3 and connect into an entirety, exert the coincide ladder beam structure jointly and bear the weight of the effect.

In other embodiments, the concave overlapping sill beam 4 height H1= overlapping ladder beam height-180 mm.

In other embodiments, the height H3 of the cast-in-place connecting section 401 = the height H4 of the concave laminated bottom beam 4+ the height H5 of the platform groove 302 is more than or equal to 180mm. Namely H3= H4+ H5 ≧ 180mm.

Referring to fig. 5, in other embodiments, the sill groove 402 width L1=0.6 x concave laminated sill 4 width L.

In other embodiments, the sill recess 402 is located at the central axis of the female overlapping sill 4.

In other embodiments, the width L2=0.2 x the width L of the concave laminated sill 4 on both sides of the sill recess 402.

Referring to fig. 4, in other embodiments, a first T-shaped steel plate 1-1 is pre-embedded in the central axis of the platform groove 302.

Referring to fig. 3, in other embodiments, a first rib penetrating hole 1-2 is reserved in a wing plate of a first T-shaped steel plate 1-1, and referring to fig. 4, a first longitudinal stressed fixing steel bar 5 is arranged in a platform section 301 of a prefabricated staircase 3, and the first longitudinal stressed fixing steel bar 5 penetrates into the first rib penetrating hole 1-2.

In other embodiments, the first longitudinally forced fixation bar 5 is located within the top of the platform section 301.

Referring to FIG. 2, in other embodiments, the sill recess 402 is located directly below the platform recess 302.

In other embodiments, the sill groove 402 and the landing groove 302 are correspondingly sized equally.

Referring to fig. 5, in other embodiments, the second T-shaped steel plate 2-1 is pre-buried in the central axis of the concave composite bottom beam 4, the longitudinal structural steel bar 8 and the stirrups 7 are arranged in the concave composite bottom beam 4, the stirrups 7 are hooped outside the longitudinal structural steel bar 8, and the number of the second T-shaped steel plate 2-1 and the stirrups 7 is at least two, and the two are arranged at intervals.

In other embodiments, the longitudinal construction rebar 8 is placed within the top of the concave laminated bottom beam 4.

In other embodiments, the stirrup 7 is a rectangular ring. And a round chamfer is arranged at the angular position of the stirrup 7. The number of the longitudinal construction steel bars 8 is at least four, and the longitudinal construction steel bars are distributed in a rectangular shape.

In other embodiments, a second rib penetrating hole 2-2 is reserved in a wing plate of the second T-shaped steel plate 2-1, a second longitudinal stressed fixed steel bar 6 is arranged in the concave type superposed bottom beam 4, and the second longitudinal stressed fixed steel bar 6 penetrates into the second rib penetrating hole 2-2.

In other embodiments, the second longitudinal load-bearing reinforcing bar 6 is located within the bottom of the concave composite bottom beam 4.

In other embodiments, the first and second T-shaped steel plates 1-1 and 2-1 are equal in number.

In other embodiments, at least three first fixing through rib holes 1-2 are reserved at the transverse central axis of the wing plate of the first T-shaped steel plate 1-1, and at least three second fixing through rib holes 2-2 are reserved at the transverse central axis of the wing plate of the second T-shaped steel plate 2-1.

In other embodiments, the inner diameter of the first fixing reinforcing bar penetrating hole 1-2 is larger than the outer diameter of the first longitudinal force-bearing fixing reinforcing bar 5, and the inner diameter of the second fixing reinforcing bar penetrating hole 2-2 is larger than the outer diameter of the second longitudinal force-bearing fixing reinforcing bar 6.

Referring to fig. 3, in other embodiments, the depths of the first fixing through-rib holes 1-2 and the second fixing through-rib holes 2-2 on the wing plates of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 are greater than or equal to the width L of the concave type overlapped bottom beam 4, and the depths of the first fixing through-rib holes 1-2 and the second fixing through-rib holes 2-2 are greater than or equal to 15 x the outer diameter of the longitudinal connecting steel bar 10.

Left flank transverse width = right flank transverse width =2 × web transverse width.

Referring to fig. 6, in other embodiments, a first fixing bar penetrating hole 1-2 is formed in a web of a first T-shaped steel plate 1-1, a second fixing bar penetrating hole 2-2 is formed in a web of a second T-shaped steel plate 2-1, and longitudinal connecting bars 10 are penetrated into the first fixing bar penetrating hole 1-2 and the second fixing bar penetrating hole 2-2 of the webs of the first T-shaped steel plate and the second T-shaped steel plate together.

In other embodiments, at least two first fixing through rib holes 1-2 are reserved on the web plate of the first T-shaped steel plate 1-1, and at least two second fixing through rib holes 2-2 are reserved on the web plate of the second T-shaped steel plate 2-1.

In other embodiments, the inner diameters of the first fixing penetration hole 1-2 and the second fixing penetration hole 2-2 on the web of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 are larger than the outer diameter of the longitudinal connecting bar 10.

In other embodiments, the depth =0.2 of the first and second fixing penetration holes 1-2 and 2-2 in the web of the first and second T-shaped steel plates 1-1 and 2-1 is not less than 3 × the outer diameter of the longitudinal connecting bar 10.

In other embodiments, the outer diameter of the longitudinal connecting reinforcement 10 is greater than or equal to the outer diameter of the second longitudinal forced fixation reinforcement 6.

In other embodiments, the thickness of the first T-shaped steel plate 1-1 = the thickness of the second T-shaped steel plate 2-1 ≧ the outer diameter of the stirrup 7.

In other embodiments, the first and second T-shaped steel plates 1-1 and 2-1 have a material and strength rating equal to that of the stirrup 7.

In other embodiments, concrete pads are placed on the projections on either side of the sill groove 402. The thickness of the concrete pad may be 20mm.

Referring to fig. 6, in some embodiments, the concave laminated bottom beam 4 and the bottom of the platform section 301 of the prefabricated staircase 3 have a transverse seam with a thickness of 20mm, cement mortar 9 is filled in the transverse seam, and cement mortar 9 is filled in the bottom beam groove 402 and the platform groove 302.

Referring to fig. 2, in some embodiments, a unfilled corner 303 is reserved in the prefabricated staircase 3, the floor slab cast-in-place rest platform 11 is provided with steps, the unfilled corner 303 is in matched lap joint with the steps, a gap is formed between the side surface of the unfilled corner 303 and the side surface of the step of the floor slab cast-in-place rest platform 11, the width of the gap can be 20mm, and a waterproof blocking layer is arranged in the gap to realize node connection.

In other embodiments, the unfilled corners 303 are square. The unfilled corner 303 is arranged at the lower end of the prefabricated staircase 3.

Referring to fig. 7, in other embodiments, a waterproof structure is laid at the bottom of the unfilled corner 303. The waterproof structure includes a layer of felt 304. The waterproof structure may also include a cement mortar screed 305.

In other embodiments, the side length of the unfilled corner 303 = h1+ h2, where h1 is the thickness from the bottom of the corresponding cast-in-place connecting section 401 platform board to the bottom edge of the unfilled corner 303, h1 is greater than or equal to the thickness/2 of the cast-in-place connecting section 401 platform board, h2 is the thickness of the waterproof structure, and h2 may be 20mm.

In other embodiments, the total thickness of the platform sections 302 of the prefabricated staircase 3= h1+ h2+ h3+ h4, h3 is the thickness from the top of the platform slab of the corresponding connected cast-in-place connecting section 401 to the top of the waterproof structure, and h4 is the thickness of the surface layer of the platform slab of the cast-in-place connecting section 401.

In other embodiments, the waterproof containment layer includes a filled polystyrene layer 306. The waterproof containment layer may also include a slip-in PE rod 307. The waterproof sealant layer can also include an injection sealant layer 308.

The embodiment of the utility model provides a prefabricated staircase connection structure can be through the construction of following step:

the method comprises the following steps: splitting the precast concrete stair component;

the construction drawing of the building structure and the structural load are comprehensively considered, the cast-in-place reinforced concrete stairway is split and deeply designed according to the design rule of the prefabricated concrete structure, a deep design drawing of the prefabricated structure (as shown in figure 2) is drawn, the plane construction drawing of each prefabricated concrete stairway component and each ladder beam is determined, the cast-in-place structure is converted into a prefabricated component single body, and the cast-in-place structure is convenient to process in a component factory.

Step two: determining the relevant attributes of the concave laminated bottom beam 4;

the height H1 of the concave superposed bottom beam 4 = the height of the superposed ladder beam-180 mm.

The height H3 of the cast-in-place connecting section 401 = the height H4 of the concave superposed bottom beam 4+ the height H5 of the platform groove 302 is more than or equal to 180mm. Namely H3= H4+ H5 ≧ 180mm.

Sill recess 402 width L1=0.6 x concave laminated sill 4 width L.

The sill recess 402 is located at the central axis of the female composite sill 4.

The width L2=0.2 × of the convex portion on both sides of the bottom beam groove 402 is the width L of the concave type composite bottom beam 4.

Step three: determining a precast concrete stair connection node;

the 3 components of prefabricated staircase comprise the terrace segment 301 at bench and both ends, and for traditional prefabricated staircase, the precast concrete stair component of this embodiment has prefabricated a part stair landing slab and has regarded as terrace segment 301, has reduced wet operation construction work such as on-the-spot template is strutted, the reinforcing bar is pricked, concrete placement, has improved the efficiency of construction. And (3) reserving rectangular platform grooves 302 with corresponding equal sizes on the platform sections 302 of the prefabricated staircase 3 components corresponding to the positions of the reserved rectangular bottom beam grooves 402 of the concave superposed bottom beams 4 in the second step.

The first T-shaped steel plate 1-1 is pre-buried in the central axis of the platform groove 302. Reserving a first rib penetrating hole 1-2 in a wing plate of a first T-shaped steel plate 1-1, arranging a first longitudinal stressed fixed steel bar 5 in a platform section 301 of the prefabricated staircase 3, and penetrating the first longitudinal stressed fixed steel bar 5 into the first rib penetrating hole 1-2.

The second T-shaped steel plate 2-1 is pre-buried in the central axis of the concave superposed bottom beam 4, a longitudinal construction steel bar 8 and stirrups 7 are arranged in the concave superposed bottom beam 4, the stirrups 7 are hooped outside the longitudinal construction steel bar 8, and the number of the second T-shaped steel plate 2-1 and the stirrups 7 is at least two and the two are arranged at intervals.

And reserving a second rib penetrating hole 2-2 on a wing plate of a second T-shaped steel plate 2-1, arranging a second longitudinal stressed fixed steel bar 6 in the concave superposed bottom beam 4, and penetrating the second longitudinal stressed fixed steel bar 6 into the second rib penetrating hole 2-2. The first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 are equal in number.

Three first fixed rib penetrating holes 1-2 are reserved at the transverse central axis of the wing plate of the first T-shaped steel plate 1-1, and three second fixed rib penetrating holes 2-2 are reserved at the transverse central axis of the wing plate of the second T-shaped steel plate 2-1.

A first fixed bar penetrating hole 1-2 is formed in a web plate of a first T-shaped steel plate 1-1, a second fixed bar penetrating hole 2-2 is formed in a web plate of a second T-shaped steel plate 2-1, and longitudinal connecting steel bars 10 penetrate into the first fixed bar penetrating hole 1-2 and the second fixed bar penetrating hole 2-2 in the web plates of the first T-shaped steel plate and the second T-shaped steel plate together.

Reserving two first fixed reinforcement penetrating holes 1-2 on a web plate of the first T-shaped steel plate 1-1, and reserving two second fixed reinforcement penetrating holes 2-2 on a web plate of the second T-shaped steel plate 2-1.

The precast stair 3 is reserved with the unfilled corner 303, the floor cast-in-place rest platform 11 is provided with steps, the unfilled corner 303 is in matched lap joint at the steps, a gap is formed between the side surface of the unfilled corner 303 and the side surface of the steps of the floor cast-in-place rest platform 11, the width of the gap can be 20mm, and a waterproof sealing layer is arranged in the gap to realize node connection.

And laying a waterproof structure at the bottom of the unfilled corner 303. The waterproof structure includes a layer of felt 304. The waterproof structure may also include a cement mortar screed 305.

The side length of the unfilled corner 303 is = h1+ h2, wherein h1 is the thickness from the bottom of the corresponding cast-in-place connecting section 401 platform plate to the bottom edge of the unfilled corner 303, h1 is greater than or equal to the thickness/2 of the cast-in-place connecting section 401 platform plate, h2 is the thickness of a waterproof structure, and h2 can be 20mm.

So that the total thickness of the platform section 302 of the prefabricated staircase 3= h1+ h2+ h3+ h4, h3 is the thickness from the top of the corresponding connected cast-in-place connecting section 401 platform board to the top of the waterproof structure, and h4 is the surface layer thickness of the cast-in-place connecting section 401 platform board.

Step four: determining relevant attributes of the T-shaped steel plate embedded part;

the T-shaped steel plate comprises wing plates on two transverse sides and a vertical web plate which are connected.

The T-shaped steel plate comprises a first T-shaped steel plate 1-1 and a second T-shaped steel plate 2-1, the first T-shaped steel plate 1-1 is of a positive T shape, the second T-shaped steel plate 2-1 is of an inverted T shape, webs of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 are connected and are connected with a cast-in-place connecting section 401, a wing plate of the first T-shaped steel plate 1-1 is connected with a platform section 301, and a wing plate of the second T-shaped steel plate 2-1 is connected with a concave type overlapped bottom beam 4.

The inner diameter of the first fixed reinforcing bar penetrating hole 1-2 is larger than the outer diameter of the first longitudinal stress fixed reinforcing bar 5, and the inner diameter of the second fixed reinforcing bar penetrating hole 2-2 is larger than the outer diameter of the second longitudinal stress fixed reinforcing bar 6.

The inner diameters of the first fixing bar penetrating hole 1-2 and the second fixing bar penetrating hole 2-2 on the web plates of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 are larger than the outer diameter of the longitudinal connecting steel bar 10.

The depth =0.2 of the first fixing bar penetrating hole 1-2 and the second fixing bar penetrating hole 2-2 on the web plate of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 is more than or equal to 3 times of the outer diameter of the longitudinal connecting steel bar 10.

The outer diameter of the longitudinal connecting steel bar 10 is larger than or equal to the outer diameter of the second longitudinal stress fixing steel bar 6.

The thickness of the first T-shaped steel plate 1-1 = the thickness of the second T-shaped steel plate 2-1 is larger than or equal to the outer diameter of the stirrup 7.

The material and strength grade of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 is equal to that of the stirrup 7.

Step five: pouring and prefabricating the precast concrete member;

and determining the size and the position of a platform groove 302 and a square unfilled corner 303 reserved in the platform section 301 and the information of the pre-buried position, the size, the model and the like of the first T-shaped steel plate 1-1 according to the detail processing drawing of the prefabricated staircase 3 component. And determining the size and the position of the reserved rectangular bottom beam groove 402, the pre-buried position, the size, the model and other information of the second T-shaped steel plate 2-1 according to the processing detailed drawing of the concave superposed bottom beam 4. Arranging a prefabricated staircase 3 component and a steel reinforcement framework of a concave superposed bottom beam 4, wherein a first longitudinal stressed fixed steel bar 5 of the prefabricated staircase 3 and a second longitudinal stressed fixed steel bar 6 at the bottom of the concave superposed bottom beam 4 respectively penetrate into a first fixed through-rib hole 1-2 and a second fixed through-rib hole 2-2, and binding connection is carried out, so that the first longitudinal stressed fixed steel bar 5 of the prefabricated staircase 3 and the second longitudinal stressed fixed steel bar 6 at the bottom of the concave superposed bottom beam 4 respectively form an effective whole with the first fixed through-rib hole 1-2 and the second fixed through-rib hole 2-2. And then assembling the prefabricated staircase 3 component and the die of the concave superposed bottom beam 4, and pouring the concrete of the prefabricated component.

Step six: maintaining and demolding the precast concrete member;

and (3) performing steam curing on the poured prefabricated staircase 3 component and the concave superposed bottom beam 4 component, respectively removing the foam protection components at the exposed parts of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 in time after the concrete is initially set, and performing anti-corrosion treatment on the foam protection components. And after maintenance is finished, removing the moulds of the prefabricated staircase 3 component and the concave superposed bottom beam 4 component, checking the surfaces and the sizes of the prefabricated staircase 3 component and the concave superposed bottom beam 4 component, the integrity of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 embedded parts, the reserved rectangular bottom beam groove 402 and the integrity of the square unfilled corner 303, installing protective facilities, and then sequentially transporting all the prefabricated concrete components to the site according to a transportation scheme.

Step seven: hoisting construction installation of precast concrete member

And after the member enters the field, the size, integrity and damage are checked again, and the exposed parts of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 and the reinforcing steel bars are straightened, so that the first fixing rib penetrating holes 1-2 and the second fixing rib penetrating holes 2-2 of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 web plates of the prefabricated staircase 3 member and the concave type superposed bottom beam 4 member are accurately aligned.

Firstly, measurement and setting-out are carried out, the mounting position of the concave type superposed bottom beam 4 component is determined, then the component is hoisted in place, and supporting and fixing are completed. And (3) finishing the installation work of one group (each group can be two) of concave superposed bottom beam 4 components, namely starting the hanging installation work of the corresponding prefabricated staircase 3 components. Firstly, concrete cushion blocks with the thickness of 20mm are placed on the upper parts of the protrusions on the two sides of the concave laminated bottom beam 4 component, and a layer of felt layer 304 and a cement mortar leveling layer 305 are paved on the bottoms of the corresponding unfilled corner 303 parts of the platform sections 301 of the floor cast-in-place rest platform plate 11 and the prefabricated staircase 3 component to form a waterproof structure, so that the waterproof effect is enhanced, and the total thickness of the waterproof structure is h2. And strip-shaped steel cushion blocks with the thickness of 20mm are arranged on the side surfaces of the unfilled corners 303, so that the distance between the floor slab cast-in-place resting platform plate 11 and the edge of the prefabricated staircase 3 component platform plate is 20mm. Then, hanging and installing the prefabricated staircase 3 component at a specified position, ensuring that the first fixing through-rib holes 1-2 and the second fixing through-rib holes 2-2 of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 web plate of the prefabricated staircase 3 component and the concave superposed bottom beam 4 component are accurately aligned, penetrating the longitudinal connecting steel bar 10 into the first fixing through-rib holes 1-2 and the second fixing through-rib holes 2-2 of the first T-shaped steel plate 1-1 and the second T-shaped steel plate 2-1 web plate, and binding and fixing two ends. The length of the longitudinal connecting steel bar 10 is equal to that of the concave superposed bottom beam 4, a transverse seam with the thickness of 20mm between the upper protruding parts of two sides of the concave superposed bottom beam 4 and the bottom of the platform section 301 of the prefabricated staircase 3 component is sealed, and then high-strength cement mortar 9 is poured into the platform groove 302 and the bottom beam groove 402 of the prefabricated staircase 3 component and the concave superposed bottom beam 4 component. And (3) taking out the strip-shaped steel cushion blocks arranged on the side surfaces of the slab cast-in-place rest platform plate 11, the prefabricated staircase 3 component platform section 301 and the corresponding unfilled corner 303 part, sequentially filling polyphenyl from bottom to top, stuffing a PE rod, and finally injecting glue for blocking, so that the bottom vertical side seam sequentially forms a polyphenyl filling layer 306, a PE rod 307 and a blocking glue 308 from top to bottom, and the node connection is completed.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A prefabricated staircase connecting structure comprises a prefabricated staircase and a superposed ladder beam, wherein the prefabricated staircase is provided with a platform section, and is characterized in that the platform section is provided with a platform groove; the superposed ladder beam comprises a concave superposed bottom beam and a cast-in-place connecting section, the concave superposed bottom beam is provided with a bottom beam groove, the cast-in-place connecting section is positioned in the platform groove and the bottom beam groove, and the concave superposed bottom beam, the cast-in-place connecting section and the platform section of the prefabricated staircase form a ladder beam whole.

2. The prefabricated staircase connecting structure as claimed in claim 1, wherein said concave folding bottom beams and said cast-in-place connecting sections are integrated with the platform section of the prefabricated staircase into a ladder beam by means of T-shaped steel plates, said T-shaped steel plates comprising wing plates and vertical webs connected to both lateral sides.

3. The prefabricated staircase connection structure of claim 2, wherein said T-shaped steel plate comprises a first T-shaped steel plate and a second T-shaped steel plate, said first T-shaped steel plate is a positive T-shape, said second T-shaped steel plate is an inverted T-shape, said webs of said first T-shaped steel plate and said second T-shaped steel plate are connected and connected to said cast-in-place connecting section, said wing of said first T-shaped steel plate is connected to said platform section, and said wing of said second T-shaped steel plate is connected to said concave laminated bottom beam.

4. A prefabricated staircase connection structure as defined in claim 3, characterised in that longitudinal construction bars and stirrups are arranged in said concave overlapping bottom beams, said stirrups being hooped outside said longitudinal construction bars.

5. The prefabricated staircase connection structure as claimed in claim 1, wherein a transverse joint is formed between the concave laminated bottom sill and the bottom of the landing section of the prefabricated staircase, cement mortar is filled in the transverse joint, and cement mortar is filled in the bottom sill groove and the landing groove.

6. The prefabricated staircase connection structure as claimed in any one of the claims 1 to 5, wherein a unfilled corner is reserved for the prefabricated staircase, a step is arranged on the cast-in-place floor rest platform, the unfilled corner is in fit and lap joint with the step, a gap is arranged between the side surface of the unfilled corner and the side surface of the step of the cast-in-place floor rest platform, and a waterproof sealing layer is arranged in the gap.

7. The prefabricated staircase connection structure as defined in claim 6, wherein said bottom of said unfilled corner is provided with a waterproof structure.

8. The prefabricated staircase connection structure of claim 6, wherein the waterproof sealant layer comprises one or both or all three of a filled polystyrene layer, a plug in PE rod, an injection sealant layer.

9. A prefabricated staircase connection structure as defined in any of claims 1-5, wherein said cast-in-place connection section is cross-shaped in cross-section with a central transverse portion forming a landing slab, said cast-in-place connection section having an upper portion located in said landing recess and a lower portion located in said sill recess.

10. The prefabricated staircase connection structure of claim 7, wherein the waterproof structure comprises a felt layer or/and a cement mortar leveling layer.

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