CN110485661B

CN110485661B - Connecting structure of prefabricated staircase

Info

Publication number: CN110485661B
Application number: CN201810814201.3A
Authority: CN
Inventors: 李藏柱
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-07-23
Filing date: 2018-07-23
Publication date: 2022-12-16
Anticipated expiration: 2038-07-23
Also published as: CN110485661A

Abstract

The invention discloses a prefabricated staircase and a connecting structure thereof, which have the technical scheme that the prefabricated staircase comprises a staircase module, wherein the upper end and the lower end of the staircase module along the length direction are respectively and fixedly connected with a reinforcing steel bar, the end part of the connecting reinforcing steel bar extending out of the staircase module is provided with an expanding head, and the outer diameter of the expanding head is larger than that of the connecting reinforcing steel bar. The connecting structure further comprises a rest platform plate, platform connecting ribs are fixed on the side face, opposite to the stair module, of the rest platform plate, the end portions, extending out of the rest platform plate, of the platform connecting ribs are provided with expansion heads, the outer diameters of the expansion heads are larger than the outer diameters of the platform connecting ribs, the platform connecting ribs are connected with the connecting ribs through sleeves, mounting holes matched with the expansion heads are formed in the sleeves, and a first post-pouring belt is arranged between the stair module and the rest platform plate. This prefabricated staircase adopts sleeve and other components to be connected, simple to operate, and the whole shock resistance of structure after the installation is accomplished is good moreover.

Description

Connecting structure of prefabricated staircase

Technical Field

The invention relates to the field of assembly type buildings, in particular to a prefabricated staircase and a connecting structure thereof.

Background

In the existing fabricated building, the used concrete prefabricated stairs can be divided into two types, one type is end parallel and level, the prefabricated stairs with exposed reinforcing steel bars are not arranged, and the other type is the prefabricated stairs with two ends provided with extending reinforcing steel bars. When the first type of prefabricated staircase is installed, two ends of the first type of prefabricated staircase are respectively lapped on the platform beam, and the first type of prefabricated staircase is sometimes connected with the platform beam through the up-down oppositely-penetrating bolts. The stairs are only lapped, so that the shock resistance is poor; even if the bolt is used for connection, the bolt is limited in number and is easily damaged by shearing force, so that the defect of poor shock resistance is also existed. When the second type of prefabricated stairway is installed, reinforcing steel bars extending out of the end heads are welded with reinforcing steel bars of a cast-in-place wall body or a cast-in-place stair rest platform plate, the structure is good in shock resistance, but the welding workload is large, and the construction efficiency is low.

Disclosure of Invention

The invention aims to provide a prefabricated staircase which is convenient to install and has good overall shock resistance after the prefabricated staircase is installed.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a prefabricated staircase, includes the stair module, and the stair module is along length direction's upper and lower both ends difference fixed connection reinforcing bar, and the tip that connecting reinforcement stretches out the stair module is provided with the enlarged footing, and the external diameter of enlarged footing is greater than connecting reinforcement's external diameter.

Through above technical scheme, stair module and other pre-buried components that have the enlarged footing reinforcing bar adopt muffjoint, and the welding is more convenient than the telescopic installation, and overlap joint or bolted connection are more firm compared in this connection moreover, and the shock resistance is better.

Furthermore, the connecting steel bars are arranged in the stair module in a through-length mode or partially embedded mode.

Furthermore, prestressed reinforcements are embedded in the stair modules along the length direction.

Furthermore, the end part of the prestressed reinforcement extending out of the stair module is provided with an expansion head, and the outer diameter of the expansion head is larger than that of the prestressed reinforcement.

Through the technical scheme, the connecting reinforcing steel bars can utilize the reinforcing steel bar net rack in the stair module, and thicker reinforcing steel bars can be embedded at two ends independently, so that the applicability is stronger; the prestressed steel bars enhance the bending resistance of the prefabricated staircase and save the using amount of the steel bars; the prestressed reinforcement expansion head is connected with the expansion heads of the embedded reinforcements of other components by the sleeve, so that the connection reliability is further improved.

Further, a reinforcing steel bar net rack is embedded in the stair module.

Furthermore, the steel bar net rack comprises an upper steel bar net and a lower steel bar net which is arranged in parallel and opposite to the upper steel bar net, and a supporting steel bar net is connected between the upper steel bar net and the lower steel bar net.

Furthermore, the stair modules are internally provided with a plurality of hollow holes along the length direction in a through mode.

Through the technical scheme, the reinforcing steel bar net rack structure has good compression resistance and bending resistance, so that the types of reinforcing steel bars used by the reinforcing steel bar net rack can be reduced, the reinforcing steel bars in the stair module are reduced, materials are saved, and the dead weight is reduced; the arrangement of the hollow holes can also reduce the dead weight.

Furthermore, connecting ribs are embedded in at least one side surface of the stair module in the width direction.

Furthermore, the connecting bars are pre-embedded U-shaped steel bars, and the open ends of the U-shaped steel bars are pre-embedded into the stair modules.

Through above technical scheme, the splice bar of side stretches into in being located the wall structure of stair module side, makes stair and wall body form wholly, improves the shock resistance.

Furthermore, embedded parts are arranged at the upper end part and the lower end part of the stair module along the length direction of the stair module.

Further, the embedded parts comprise embedded steel plates and/or embedded angle irons and/or embedded bolt sleeves.

Through above technical scheme, during the installation, utilize connecting plate and bolt to be connected stair module and other members, support the reinforcement temporarily.

Further, a landing board is also included, the landing board being located at an end of the stair module; rest platform board and stair module integrated into one piece, the connecting reinforcement link up the rest platform board to stretch out from the terminal surface of rest platform board.

Through the technical scheme, the rest platform plate and the stair module are integrally formed, so that the process of casting the rest platform plate in situ is reduced, and the connection integrity of the rest platform plate and the stair module is better; in addition, the extended connecting steel bar with the expanded head can be connected with other components by the sleeve, and a structure with better shock resistance is formed.

A second object of the present invention is to provide a connecting structure of a prefabricated staircase, which effectively connects the prefabricated staircase with an end wall to form a building structure with better shock resistance. The technical purpose of the invention is realized by the following technical scheme: a connecting structure of a prefabricated staircase comprises an end wall body and the prefabricated staircase fixedly connected with a rest platform plate; at least one end of the upper end part and the lower end part of the prefabricated staircase along the length direction of the prefabricated staircase is connected with the end wall, and a second post-pouring belt is reserved at the position where the end wall is connected with the prefabricated staircase.

Further, set up the second reinforcing mat in the second post-cast strip, the second reinforcing mat includes a plurality of logical long reinforcing bars, leads to long reinforcing bar periphery hoop and establishes a plurality of stirrups.

Through the technical scheme, after the connecting steel bars extend into the second post-pouring strip, the connecting steel bars are not easy to pull out due to the arrangement of the enlarged heads, so that the overall shock resistance is improved; the second reinforcing net is arranged to strengthen the limitation on the enlarged head, and the shock resistance is further improved.

A third object of the present invention is to provide a connecting structure of a prefabricated staircase, which effectively connects the prefabricated staircase with a landing slab to form a building structure with better shock resistance. The technical purpose of the invention is realized by the following technical scheme: a connecting structure of a prefabricated staircase comprises the prefabricated staircase and a rest platform plate; the stair module comprises a stair module and is characterized in that a platform connecting rib is fixed on the side face, opposite to the stair module, of the rest platform plate, an expanded head is arranged at the end portion, extending out of the rest platform plate, of the platform connecting rib, the outer diameter of the expanded head is larger than that of the platform connecting rib, the platform connecting rib is connected with the connecting rib through a sleeve, a mounting hole matched with the expanded head is formed in the sleeve, and a first post-pouring belt is arranged between the stair module and the rest platform plate.

Through above technical scheme, prefabricated stair and for the rest platform board muffjoint, not only construction convenience, firm in connection moreover, whole shock resistance is good.

The fourth purpose of the invention is to provide a connecting structure of the prefabricated staircase, which is used for connecting the prefabricated staircase with the side wall body and has good overall shock resistance. The technical purpose of the invention is realized by the following technical scheme: the utility model provides a connection structure of prefabricated staircase, includes side wall body and prefabricated staircase, and prefabricated staircase links to each other with the side wall body along at least one side of its width direction's both sides, and the third post-cast strip is reserved with prefabricated staircase junction to the side wall body, and the splice bar stretches into inside the third post-cast strip.

Further, set up the third reinforcing mesh in the third post-cast strip, the third reinforcing mesh includes a plurality of logical long reinforcing bars, leads to long reinforcing bar periphery hoop and establishes a plurality of stirrups.

Through above technical scheme, the third post-cast strip is connected the side wall body and prefabricated staircase into whole for prefabricated staircase is connected except connecting at its both ends, also carries out effective connection with building wall at the side, makes building structure wholeness, shock resistance better.

In conclusion, the invention has the following beneficial effects:

1. the prefabricated staircase and the surrounding components are connected by the sleeves, so that the prefabricated staircase is more convenient to weld compared with the prefabricated staircase and is firmer in lap joint or bolt connection and better in shock resistance;

2. the prefabricated staircase is effectively connected with the end wall body, the side end wall body and the rest platform, so that the staircase and other components form a whole, and the integral shock resistance of the building is improved;

3. the intensity of prefabricated stair has been strengthened in setting up of reinforcing bar rack and prestressing steel, reduces the reinforcing bar quantity moreover.

Drawings

FIG. 1 is a schematic structural view of a prefabricated staircase with embedded connecting steel bars;

FIG. 2 is a schematic structural view of a prefabricated staircase with connecting steel bars arranged in full length;

FIG. 3 is a schematic view of the stair module in telescoping engagement with the landing deck;

FIG. 4 is a schematic view of the connection structure of the stair module provided with embedded parts and the rest platform plate;

FIG. 5 is a schematic structural view of a stair module with U-shaped reinforcing bars arranged on the side faces;

FIG. 6 is a schematic view of the connection of the stair module with the side wall;

FIG. 7 is a schematic view of the stair module in elevation in conjunction with a side wall;

FIG. 8 is a schematic view of the structure of the stair module with both sides connected to the side wall;

fig. 9 is a schematic view of the connection structure of the prefabricated staircase and the end wall body formed by integrating the rest platform plate and the staircase module;

FIG. 10 is a schematic structural view of a stair module provided with a single layer of pre-stressed steel bars;

FIG. 11 is a schematic structural view of a stair module provided with a double-layer prestressed reinforcement;

fig. 12 is a schematic view of a modular structure of a stair provided with a rebar grid;

FIG. 13 isbase:Sub>A cross-sectional view A-A of FIG. 12;

fig. 14 is a schematic view of a stair module structure provided with hollow holes;

FIG. 15 is a schematic view of the structure of the cylinder in the necking type steel bar connecting sleeve;

FIG. 16 is a schematic end view of the throat;

FIG. 17 is a schematic view of the sleeve and connecting reinforcement being mated;

FIG. 18 is a schematic view showing the connection relationship between the sleeve and the prefabricated member;

FIG. 19 is a schematic structural view of a split cartridge;

FIG. 20 is a schematic view showing the connection relationship between the split type cylinder and the prefabricated part;

FIG. 21 is a schematic view of the structure of the cartridge type sleeve extending outwardly;

fig. 22 is a schematic view of the assembly of the out-projecting bayonet sleeve and connecting bars.

In the figure, 1, a stair module; 11. connecting reinforcing steel bars; 110. a head is expanded; 12. pre-stressing the steel bars; 14. a steel bar net rack; 141. a steel bar net is arranged; 142. laying a reinforcing mesh; 143. supporting the reinforcing mesh; 15. a hollow bore; 16. u-shaped steel bars; 17. embedding angle iron; 19. connecting steel plates; 2. a sleeve; 3. a rest platform plate; 31. platform connecting ribs; 32. a first post-cast strip; 4. an end wall body; 41. a second post-cast strip; 5. a side wall body; 51. prefabricating a wallboard; 52. prefabricating a wallboard downwards; 53. a third post-pouring belt; 6. a barrel; 61. necking; 611. a transition conical surface; 62. grouting holes; 63. a connecting plate; 631. a through hole; 65. a clamping block; 651. a clamping hole; 66. a spring plate; 7. and (6) prefabricating a floor slab.

Detailed Description

The present invention will be described in further detail with reference to examples.

The utility model provides a prefabricated staircase, as shown in fig. 1, includes stair module 1, and stair module 1 is along length direction's upper and lower both ends respectively fixed connection reinforcing bar 11, and the tip that connecting bar 11 stretches out stair module 1 is provided with enlarged head 110, and enlarged head 110's external diameter is greater than connecting bar 11's external diameter. The connecting bars 11 may also be partially pre-buried in the stair module 1, or as shown in fig. 2, the connecting bars 11 may be disposed throughout the length of the stair module 1.

As shown in fig. 3, the prefabricated staircase further comprises a rest platform plate 3, the side face of the rest platform plate 3 opposite to the staircase module 1 is provided with a fixed platform connecting rib 31, the end part of the platform connecting rib 31 extending out of the rest platform plate 3 is provided with an expansion head 110, and the outer diameter of the expansion head 110 is larger than that of the platform connecting rib 31. The platform connecting bar 31 is connected to the connecting bar 11 by using a sleeve 2, and the sleeve 2 is provided with a mounting hole matched with the enlarged head 110 (the structure of the sleeve 2 and the detailed connection mode are described in the last paragraph). A first post-cast strip 32 is arranged between the stair module 1 and the landing slab 3.

The construction process comprises the following steps: firstly, mounting the stair module 1 and the rest platform plate 3 in place and temporarily supporting the stair module, and sleeving the sleeve 2 on the platform connecting rib 31 and the enlarged head 110 of the connecting reinforcing steel bar 11; pouring the concrete of the first post-pouring belt 32, enabling the concrete slurry to flow into the sleeve 2 from the openings at the two ends of the sleeve 2 and fill the sleeve 2, and enabling the stair module 1 and the rest platform plate 3 to be connected after the concrete slurry is solidified.

Because the installation of sleeve 2 is compared the welding more convenient, so improved the efficiency of construction of whole stair, overlap joint or bolted connection are more firm in this connection moreover, and the shock resistance is better.

During the installation, stair module 1 and rest platform board 3 all need carry out interim support, in order to strengthen the temporary connection between the two, as shown in fig. 4, stair module 1 and rest platform board 3 interconnect's tip sets up the built-in fitting. The embedded part can be an embedded steel plate, an embedded angle iron 17 or an embedded bolt sleeve. When the device is installed, the two are connected by a connecting steel plate 19. The connecting steel plate 19 can be welded with the embedded angle iron 17, and can also be connected by bolts.

The second embodiment:

the side of the existing staircase in the width direction is generally abutted against the wall surface and is not effectively connected. This embodiment introduces a connection structure of prefabricated staircase, can realize the effective connection of stair module 1 and side and wall body, improves the wholeness of stair and wall body. The stair module 1 is embedded with a connecting rib along at least one side surface of the width direction, the connecting rib can be a straight rib with an enlarged head 110, or a U-shaped steel bar 16 shown in fig. 5, and the opening end of the U-shaped steel bar 16 is embedded into the stair module 1. As shown in fig. 6 and 7, the side wall 5 is a prefabricated wall panel, which includes an upper prefabricated wall panel 51 and a lower prefabricated wall panel 52, a third post-cast strip 53 is disposed therebetween, and the u-shaped reinforcing bars 16 extend into the third post-cast strip 53. Set up the third reinforcing mesh in the third post-cast strip 53, the third reinforcing mesh includes a plurality of logical long reinforcing bars, and a plurality of stirrups are hooped to logical long reinforcing bar periphery. Preferably, the full length rebar penetrates into the U-shaped rebar 16.

The construction process is as follows: installing and fixing the lower prefabricated wall panel 52; installing the stair module 1, and enabling the U-shaped steel bars 16 to extend into the third post-cast strip 53; installing a third reinforcing mesh and installing a support member (which may be a short I-shaped steel or the like, not shown) for supporting upper prefabricated wall panel 51 on the upper surface of lower prefabricated wall panel 52; installing the prefabricated wall panel 51; and pouring the third post-cast strip 53.

Because the connecting ribs extend into the third post-pouring belt 53, the third post-pouring belt 53 is poured and solidified, and then the side end wall body 5 and the prefabricated staircase are connected into a whole. This structure has realized only both ends fixed connection with prefabricated staircase among the prior art, has become the connection of three direction to building overall structure's shock resistance has been improved greatly.

In order to facilitate the pouring of the third post-cast strip 53, a vertical hollow hole can be arranged in the upper prefabricated wall panel 51 to serve as a pouring channel of concrete.

As shown in fig. 8, when the staircase is not a revolving staircase but a straight staircase, U-shaped steel bars 16 are disposed on both sides of the staircase module 1, so that the staircase is connected to both walls on both sides.

In addition, the rest platform plate 3 can also be connected with the wall body by embedding U-shaped steel bars 16 on the side end surface according to the scheme.

Example three:

the difference from the first embodiment is that, as shown in fig. 9, the landing slab 3 is integrally formed with the stair module 1, and the connecting steel bars 11 penetrate through the landing slab 3 and extend out from the side of the landing slab 3. The enlarged head 110 of the connecting steel bar 11 extends into the end wall 4, and a second post-cast strip 41 is reserved at the connecting position of the end wall 4 and the prefabricated staircase.

The arrangement of the enlarged head 110 can effectively prevent the connecting steel bar 11 from being pulled out of the second post-cast strip 41, thereby improving the reliability of the connection between the stair and the wall. In order to further improve the reliability of connection, set up the second reinforcing mesh in the second post-cast strip 41, the second reinforcing mesh includes a plurality of logical long reinforcing bars, and logical long reinforcing bar periphery hoops and establishes a plurality of stirrups. The enlarged head 110 extends into the second reinforcing mesh, and the hooping wraps the concrete inside the enlarged head 110, so that the concrete is less prone to loose damage, the enlarged head 110 is wrapped by the concrete and firmer, and the shock resistance is further improved.

Further, referring to fig. 9, the reinforcing steel bars with the expanded heads 110 may also be embedded in the prefabricated floor slab 7 on the other side of the wall, and after the expanded heads 110 extend into the second post-cast strip 41, the expanded heads 110 of the prefabricated floor slab 7 are connected with the expanded heads 110 of the prefabricated staircase by using the sleeves 2 (the sleeves are not shown in the figure).

The connection node of the rest platform board 3 and the end wall 4 in this embodiment may also be applicable to the rest platform board 3 in the first embodiment.

Example four:

as shown in fig. 10, in order to increase the bending resistance of the prefabricated staircase in the length direction, prestressed reinforcements 12 can be embedded in the staircase module 1 in the length direction. The prestressed reinforcement 12 may be provided only in one layer at the bottom of the stair module 1, or may be provided in two layers as shown in fig. 11.

Further, as shown in fig. 10, an enlarged head 110 is provided at the end of the prestressed reinforcement 12 extending out of the stair module 1, and the outer diameter of the enlarged head 110 is larger than the outer diameter of the prestressed reinforcement 12. The prestressed reinforcement 12 provided with the enlarged head 110 can be connected with the sleeve 2 for reinforcement of the surrounding member by the sleeve 2 as well. Thereby better improving structural integrity.

As shown in fig. 12 and 13, in order to improve the overall rigidity of the stair module 1, a reinforcing steel bar net rack 14 is embedded inside the stair module 1. The net rack 14 includes an upper net 141 and a lower net 142 opposite to and parallel to the upper net 141, and a support net 143 is connected between the upper net 141 and the lower net 142. The supporting reinforcing mesh 143 is a plurality of trusses arranged in parallel with each other, and the extending direction of the trusses is the same as the length direction of the stairs. Each truss is a continuous steel mesh sheet with a triangular structure, the top of the truss is welded with the upper steel mesh 141, and the bottom of the truss is welded with the lower steel mesh 142. Because the steel bar net rack 14 has the integral frame structure formed by mutually welding the rods, compared with the conventional reinforcement in the prior art, the steel bar net rack has good bending resistance and compression resistance, and the adopted steel bars can be small-diameter steel bars with the diameter of 4mm to 6mm, so that the strength of the prefabricated staircase can be enhanced, the self weight is reduced, and the materials are saved.

In order to reduce the weight of the staircase, as shown in fig. 14, a plurality of hollow holes 15 are arranged in the staircase module 1 along the length direction.

The sleeve structure and the connection method thereof are introduced as follows:

the sleeve 2 can adopt a necking type steel bar connecting sleeve and a clamping piece type sleeve which extends outwards.

Necking type steel bar connecting sleeve:

as shown in fig. 15, the necking steel bar connecting sleeve includes a cylinder 6 and necking openings 61 (the necking openings 61 are the mounting holes mentioned above) integrally connected to two ends of the cylinder 6, and the cylinder 6 is provided with a plurality of grouting holes 62 uniformly distributed, so that cement slurry can flow into the cylinder 6 conveniently; referring to fig. 16, the throat 61 is a circular throat, the inner wall of the throat 61 is a conical surface, and the larger end of the conical surface faces the inside of the cylinder 6; with reference to fig. 17, the connection structure of the necking steel bar connection sleeve is composed of a connection steel bar 11 and a cylinder 6, one end of the connection steel bar 11 is fixedly connected inside the prefabricated component in a pre-embedded manner, the other end of the connection steel bar is exposed outside the prefabricated component, and an end part far away from the prefabricated component is integrally connected with an expansion head 110, the radial size of the outer wall of the expansion head 110 is larger than that of the outer wall of the connection steel bar 11 and smaller than that of the inner wall of the necking 61, and the expansion head 110 can extend into the cylinder 6 from the necking 61.

As shown in fig. 18, after cement slurry flows into the cylinder 6 from the grouting holes 62 and the necks 61 at both ends and is solidified to form concrete, the enlarged head 110 may be fixed inside the cylinder 6, and the connecting bars 11 at both ends of the cylinder 6 may be restricted from moving in a direction away from each other to pull out the cylinder 6, thereby connecting the prefabricated members at both ends and improving the connection strength between the two prefabricated members. (in fig. 18, the rectangular block structure of the connecting steel bar 11 far from the end of the cylinder 6 is a schematic view of the stair module 1, the landing slab 3 or the prefabricated floor slab 7, and when the landing slab 3 is understood, the corresponding steel bar is the platform connecting steel bar 31).

One end of the enlarged head 110 close to the connecting steel bar 11 is in a circular truncated cone shape, and one end of the enlarged head 110 close to the precast slab 7 is smaller than the other end; for convenience of description, the conical surface of the reducing mouth 61 is defined as a transition conical surface 611, the reducing mouth 61 and the end of the cylinder 6 are integrally connected through the transition conical surface 611, after the connecting steel bar 11 receives a force in the direction of pulling out the cylinder 6, the circular table extrudes concrete, the concrete transmits the extrusion force (the direction indicated by the arrow F in fig. 18 is a schematic diagram of the direction of the force) to the transition conical surface 611, the reaction force generated by the transition conical surface 611 has a component force in the radial direction on the expansion head 110, and presses the expansion head 110 in the radial direction, so that the transition conical surface 611 can make the cylinder 6 and the concrete inside bear larger load, and improve the connection strength between the connecting steel bar 11 and the expansion head 110 and the cylinder 6.

When the sleeve is used for pouring concrete, concrete slurry enters the barrel 6 to complete connection of the connecting reinforcing steel bars 11, and compared with welding, the sleeve does not need an independent welding machine, is convenient to operate and saves cost. In addition, because the scheme is that pressure transmission is relied on, connection is flexible connection, and compared with welding, the connection node has a certain moving space under the earthquake action, is not easy to damage, and has better earthquake resistance.

The shape of the necking 61 can be circular, square, long strip, oval and other shapes, and the cross section of the enlarged head 110 is matched with the shape of the necking 61. In order to effectively transmit the pressure of the enlarged head 110 to the cylinder 6 through the concrete, the size of the necking opening 61 is larger than that of the enlarged head 110 by 1 to 5mm, preferably 2 to 3mm.

As shown in fig. 19 and 20, the cylinder 6 has a split structure and can be split into two halves in the axial direction. The equal fixedly connected with connecting plate 63 in one end outside surface that two halves barrel 6 are close to each other all has seted up through-hole 631 on the connecting plate 63, and two halves barrel 6 are the butt joint amalgamation back each other, and through-hole 631 on the connecting plate 63 can align each other, and the accessible inserts bolt spare such as round pin or bolt simultaneously in two through-holes 631 that align each other, carries out the pin joint to two connecting plates 63, restricts two halves barrel 6 and separates each other towards the direction of keeping away from each other.

When the distance between the two prefabricated components is relatively small, referring to fig. 3, for example, when the width of the first post-cast strip 31 is relatively narrow, the distance between the connecting steel bar 11 and the end face of the platform connecting steel bar 31 is relatively small, the cylinder 6 can be split into two halves, one half of the cylinder 6 is sleeved on one of the connecting steel bar 11, the other half of the cylinder 6 is sleeved on the connecting steel bar 11, and finally the two halves of the cylinder 6 slide along the axial direction of the connecting steel bar 11 and in the direction of approaching each other, so that the through holes 631 on the connecting plates 63 are aligned with each other, and the two halves of the cylinder 6 are spliced together by inserting the bolt pieces into the through holes 631. The split sleeve facilitates rapid installation of the sleeve in narrow environments.

Stretch into fastener formula sleeve outward:

as shown in fig. 21 and 22, the external-inserted clip-type sleeve includes a barrel 6, a clip block 65, and a spring plate 66, wherein both ends of the barrel 6 are provided with clip holes 651 for the clip block 65 to be inserted, and the barrel 6 is provided with a grouting hole 62. One end of the elastic sheet 66 is fixedly connected with the outer side surface of the cylinder body 6, and the other end of the elastic sheet 66 is fixedly connected with one end of the clamping block 65, which is positioned at the outer side of the cylinder body 6.

One end of the connecting steel bar 11 is fixedly connected with an enlarged head 110, the radial dimension of the enlarged head 110 is larger than that of the connecting steel bar 11, and the enlarged head 110 can be inserted into the cylinder 6 from the port of the cylinder 6. In the inserting process, the expansion head 110 pushes the clamping block 65 to move towards the direction far away from the central axis of the cylinder body 6, the elastic sheet 66 is driven to deform elastically, after the expansion head 110 passes over the clamping block 65, the elastic sheet 66 gradually recovers to deform and is inserted into the cylinder body 6 to reset, and the expansion head 110 is limited to extract the cylinder body 6.

When the post-cast strip around the cylinder 6 is used for pouring concrete, cement slurry can flow into the cylinder 6 from the two ports of the cylinder 6 and the grouting holes 62, solid concrete is formed after the cement slurry is solidified, and the connecting steel bars 11 are fixed inside the cylinder 6, so that the connection of the two connecting steel bars 11 is realized.

In addition, it should be noted that the sleeve may adopt 4 inventions related to the sleeve filed by the applicant in 2018, no. 4/8, which are 201810306670.4, 201810307419.X, 201810307420.2 and 201810307967.2, respectively.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as required after reading the present specification, but all of them are protected by patent law within the scope of the present invention.

Claims

1. The utility model provides a connection structure of prefabricated staircase which characterized in that: the stair module comprises a stair module (1) and a necking type steel bar connecting sleeve, a rest platform plate (3), wherein the upper end and the lower end of the stair module (1) along the length direction are respectively fixedly connected with steel bars (11), the end part of each connecting steel bar (11) extending out of the stair module (1) is provided with an expansion head (110), the outer diameter of each expansion head (110) is larger than the outer diameter of each connecting steel bar (11), the side surface of the rest platform plate (3) opposite to the stair module (1) is fixedly provided with a platform connecting rib (31), the end part of each platform connecting rib (31) extending out of the rest platform plate (3) is provided with the expansion head (110), the outer diameter of each expansion head (110) is larger than the outer diameter of each platform connecting rib (31), each platform connecting rib (31) is connected with each connecting steel bar (11) through the necking type steel bar connecting sleeve (2), each necking type steel bar connecting sleeve (2) is provided with a mounting hole matched with each expansion head (110), a first rear pouring belt (32) is arranged between the stair module (1) and the rest platform plate (3), and the rest platform plate (3) do not extend to the upper side or the lower side of the first rear pouring belt;

necking type steel bar connecting sleeve, including barrel (6) and integrative connection in barrel (6) both ends throat (61) barrel (6) lateral wall on set up a plurality of evenly distributed's slip casting hole (62), be convenient for the grout to flow into inside barrel (6), barrel (6) have the components of a whole that can function independently structure, can be followed the axial split and be two halves, the one end outside surface that two halves barrel (6) are close to each other all fixedly connected with connecting plate (63), all seted up through-hole (631) on connecting plate (63), two halves barrel (6) are butt joint amalgamation each other after, through-hole (631) on connecting plate (63) can align each other, the accessible inserts bolt spare such as round pin or bolt simultaneously in two through-holes (631) that align each other;

the bottom of the end part of the stair module (1) connected with the rest platform plate (3) is provided with embedded angle iron, the two embedded angle irons are connected through a connecting steel plate, and the connecting steel plate is directly connected with the angle iron through bolts;

the connecting steel bars (11) utilize a steel bar net rack in the stair module, the steel bar net rack comprises an upper steel bar net and a lower steel bar net which is arranged in parallel and opposite to the upper steel bar net, the upper steel bar net and the lower steel bar net are connected and supported with the steel bar net, and a plurality of hollow holes are arranged in the stair module in a penetrating mode along the length direction of the stair module.

2. The connecting structure of the prefabricated staircase according to claim 1, wherein: the connecting steel bars (11) are arranged in the stair module (1) in a through-length mode or partially embedded mode.

3. The connecting structure of the prefabricated staircase according to claim 2, wherein: prestressed reinforcements (12) are embedded in the stair module (1) along the length direction.

4. The connection structure of the prefabricated staircase according to claim 3, wherein: the end part of the prestressed reinforcement (12) extending out of the stair module (1) is provided with an expansion head (110), and the outer diameter of the expansion head (110) is larger than that of the prestressed reinforcement (12).

5. The connecting structure of the prefabricated staircase according to claim 2, wherein: a reinforcing steel bar net rack (14) is embedded in the stair module (1).

6. The connection structure of the prefabricated staircase according to claim 5, wherein: the steel bar net rack (14) comprises an upper steel bar net (141) and a lower steel bar net (142) which is arranged opposite to the upper steel bar net (141) in parallel, and a supporting steel bar net (143) is connected between the upper steel bar net (141) and the lower steel bar net (142).