CN113323299A

CN113323299A - Prefabricated steel construction stair of assembly type structure

Info

Publication number: CN113323299A
Application number: CN202110646824.6A
Authority: CN
Inventors: 宋锦来
Original assignee: Wuhan Nuoyixin Decoration Engineering Co ltd
Current assignee: Wuhan Nuoyixin Decoration Engineering Co ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2021-08-31

Abstract

The invention provides an assembly type building prefabricated steel structure stair which comprises ladder beams, supporting units and stair boards, wherein the ladder beams are symmetrically arranged, and the stair boards are arranged on the opposite sides of the ladder beams at equal intervals through the supporting units; the present invention can solve the following problems: firstly, when the traditional steel structure stair is assembled, most of the stair treads are lifted to the side wall of the stair beam by workers, and then the stair treads and the stair beam are fixed, and the workers lift the stair treads for a long time, so that the stair treads are easy to fatigue, and the mounting precision of the stair treads is influenced; two, present steel construction stair are when the assembly, and the majority is with the bracing piece beading of handrail on the ladder roof beam, and then at bracing piece upper end welded connection post, consequently can't dismantle the bracing piece, can only disposable to the extravagant cost, and can't consolidate between the bracing piece and handle, consequently influence the result of use in later stage.

Description

Prefabricated steel construction stair of assembly type structure

Technical Field

The invention relates to the technical field of steel structure stairs, in particular to an assembly type prefabricated steel structure stair for a building.

Background

With the development of building technology, the prefabricated steel structure building has been widely used, and has the characteristics of light dead weight, low foundation cost, fast construction, less construction pollution, good earthquake resistance, recycling, economy, environmental protection and the like, and in view of the characteristics, the prefabricated steel structure is often used for the production of the steel structure stairs, the steel structure stairs are mainly characterized by few pivots, high bearing capacity, multiple shapes, high technical content, difficult influence of the structures such as the upright posts and the floor, firmness and firmness, and after the general steel structure stairs are manufactured, the stair plates and the stair beams need to be assembled and fixed according to the use requirements, and then put into use the steel construction stair that the assembly was accomplished, and need ensure the installation accuracy between stair board and the ladder beam to its assembly to ensure the result of use in later stage.

However, the following problems exist when the steel structure stair is assembled at present: firstly, when the traditional steel structure stair is assembled, most of the stair treads are lifted to the side wall of the stair beam by workers, and then the stair treads and the stair beam are fixed, and the workers lift the stair treads for a long time, so that the stair treads are easy to fatigue, and the mounting precision of the stair treads is influenced;

two, present steel construction stair are when the assembly, and the majority is with the bracing piece beading of handrail on the ladder roof beam, and then at bracing piece upper end welded connection post, consequently can't dismantle the bracing piece, can only disposable to the extravagant cost, and can't consolidate between the bracing piece and handle, consequently influence the result of use in later stage.

Disclosure of Invention

First, technical problem to be solved

The prefabricated steel structure stair for the fabricated building can solve the problems pointed out in the background art.

Second, technical scheme

In order to achieve the above purposes, the invention adopts the following technical scheme that the prefabricated steel structure stair for the fabricated building comprises ladder beams, supporting units and stair boards, wherein the ladder beams are symmetrically arranged, slots are formed in the upper ends of the ladder beams at equal intervals, positioning slots are symmetrically formed in the lower sides of the slots, and the stair boards are installed on the opposite sides of the ladder beams at equal intervals through the supporting units, wherein:

the support unit includes L type fixed plate, locating hole, screw, bracing piece, spliced pole, spacing subassembly, joint subassembly and reinforcement assembly, wherein: the L-shaped fixing plate is fixedly installed on the opposite side of the ladder beam at equal intervals, the stair plate is installed at the upper end of the L-shaped fixing plate, positioning holes are respectively formed in the horizontal section and the vertical section of the L-shaped fixing plate at equal intervals, screws are inserted into the positioning holes, the supporting rods are arranged in the slots, T-shaped sliding grooves are formed in the middle of the supporting rods in a downward extending mode, clamping grooves are symmetrically formed in the lower sides of the T-shaped sliding grooves, limiting sliding grooves are formed in the lower ends of the clamping grooves, limiting assemblies are arranged in the T-shaped sliding grooves, connecting columns are installed at the upper ends of the supporting rods through clamping assemblies, and reinforcing assemblies are installed between the adjacent supporting rods; workers place the stair boards on the L-shaped fixing plate, so that the horizontal sections of the stair boards are attached to the vertical sections of the L-shaped fixing plate, the vertical sections of the stair boards are attached to the horizontal sections of the L-shaped fixing plate, and then the worker adjusts the placing position of the stair boards according to the processing requirement, thereby improving the installation precision of the stair boards, after the adjustment is finished, the worker fixes the stair boards on the L-shaped fixing plate through screws, so as to fix the stair tread, the L-shaped fixing plate can support the stair tread during the period, thereby enhancing the use strength of the stair tread and prolonging the service life of the stair tread, further, workers carry out secondary welding and fixing on the joint of the L-shaped fixing plate and the stair tread, thereby enhancing the fixing effect, and then fix the bracing piece on the ladder roof beam through spacing subassembly, and can fix bracing piece and spliced pole through the joint subassembly, and then consolidate fixedly to the spliced pole through consolidating the subassembly.

As a preferred technical scheme of the present invention, the limiting component includes a T-shaped rod, a return spring, a push rod, a moving block, a baffle, a telescopic spring and a limiting block, wherein: the T-shaped rod is arranged in the T-shaped chute in a sliding manner, the lower end of the T-shaped rod is provided with a return spring arranged at the lower end of the T-shaped chute, push rods are hinged along the lower side of the T-shaped rod in a bilateral symmetry manner, the other end of each push rod is hinged with a moving block arranged in the limiting chute in a sliding manner, the baffle is arranged in the positioning groove in a sliding manner through a telescopic spring, and the other end of the baffle is provided with a limiting block extending into the T-shaped chute; a worker inserts the supporting rod into the slot, the lower end of the supporting rod extrudes the limiting blocks towards two sides during the insertion, the worker continuously presses the supporting rod downwards at the moment, and when the clamping groove moves to the limiting blocks, the limiting blocks are inserted into the clamping groove under the action of the telescopic spring matched with the baffle, so that the supporting rod is limited and fixed, and the operation is convenient; when the supporting rod needs to be disassembled, a worker presses the T-shaped rod to enable the T-shaped rod to swing the push rods on the two sides outwards at the same time, and further enable the push rods to push the moving block outwards, so that the moving block pushes the limiting blocks towards the two sides, the limiting blocks are separated from the clamping grooves and are contracted into the positioning grooves, the limiting effect on the supporting rod is eliminated, the supporting rod is convenient to disassemble, and the structure is simple; after the disassembly is finished, the T-shaped rod is upwards retracted and reset under the action of the reset spring, and the T-shaped rod drives the moving block to retract and reset through the push rod in the period.

As a preferred technical scheme of the invention, the lower end of the connecting column is provided with fixing grooves matched with the supporting rods at equal intervals, and the upper ends of the fixing grooves are symmetrically provided with locking grooves.

As a preferred technical scheme of the invention, the clamping assembly comprises a convex chute, a supporting spring, a linkage plate and a locking block, wherein: the convex sliding grooves are symmetrically formed in one side, away from the slot, of the supporting rod, supporting springs are installed in the convex sliding grooves, linkage plates which are arranged in the convex sliding grooves in a sliding mode are installed at the other ends of the supporting springs, and locking blocks matched with the locking grooves are installed on one sides, away from the supporting springs, of the linkage plates; when the workman installed the spliced pole on the bracing piece, made the bracing piece insert to the fixed slot in for the latch segment contracts to protruding type spout under the extrusion of fixed slot in, the workman continues to press the bracing piece downwards this moment, and when the latch segment was located locking groove department, the latch segment inserted to locking inslot under the effect of supporting spring cooperation linkage board, thereby carries out multistage spacing fixed to the spliced pole, and can strengthen fixed effect.

As a preferred technical solution of the present invention, the reinforcing component includes a reinforcing rod, a connecting groove, a positioning plate, and a bidirectional screw, wherein: a reinforcing rod is fixedly arranged between every two adjacent supporting rods, connecting grooves are formed in the sides, away from the supporting rods, of the reinforcing rods, threaded holes are formed in the sides, away from the supporting rods, of the connecting grooves, a positioning plate is rotationally arranged in the connecting grooves, and two-way screws matched with the threaded holes are jointly connected to the sides, away from the supporting rods, of the positioning plate; through rotating the two-way screw rod, make two-way screw rod cooperation screw hole drive the anchor strut synchronous phase to each other removal or synchronous reverse movement of both sides, can consolidate according to the bracing piece of different intervals and handle to adaptability can be improved.

As a preferred technical scheme of the invention, the stair plates are L-shaped structures, and reinforcing irons are respectively and fixedly installed at the joints of the horizontal sections and the vertical sections of the stair plates and the L-shaped fixing plates; the use strength of the stair boards can be enhanced through the reinforcing iron, so that the fixing effect between the stair boards and the L-shaped fixing plates can be improved.

As a preferable technical scheme of the invention, the lower end of the T-shaped rod is of a triangular structure which is convenient for extruding the limiting block to two sides.

As a preferred technical scheme of the invention, the limiting block is a structure which is convenient to be matched with the T-shaped rod and gradually inclines to one side of the T-shaped rod from top to bottom; when pressing down T type pole, can extrude the stopper to both sides through the slope structure to can avoid the stopper to appear interfering, and convenient operation.

Third, beneficial effect

1. The assembly of the steel structure stair is greatly improved, and the problem that when one or the traditional steel structure stair is assembled, most of stair treads are lifted to the side wall of the stair beam by workers, so that the stair treads and the stair beam are fixed, and the stair treads are easy to fatigue after being lifted for a long time by the workers, so that the stair treads are easy to shift, and the installation accuracy of the stair treads is influenced can be solved; two, present steel construction stair are when the assembly, and the majority is with the bracing piece beading of handrail on the ladder roof beam, and then at bracing piece upper end welded connection post, consequently can't dismantle the bracing piece, can only disposable to the extravagant cost, and can't consolidate between the bracing piece and handle, consequently influence the result of use "scheduling problem in later stage.

2. The support unit is arranged, the stair plates can be supported through the L-shaped fixing plate, and then workers can adjust the placing positions of the stair plates according to the processing requirements, so that the calibration of the workers is facilitated, the stair plates can be prevented from deviating, and the mounting accuracy of the stair plates is improved.

3. The limiting assembly is inserted into the slot through the supporting rod, the limiting blocks are extruded towards two sides by the lower end of the supporting rod, and when the clamping groove moves to the limiting blocks, the limiting blocks are inserted into the clamping groove under the action of the telescopic spring matched with the baffle plate, so that the supporting rod is limited and fixed.

4. According to the clamping assembly provided by the invention, when the connecting column is arranged on the supporting rod, the supporting rod can be inserted into the fixing groove, so that the locking block can be contracted into the convex sliding groove under the extrusion of the fixing groove, the supporting rod is continuously pressed downwards at the moment, and when the locking block is positioned at the locking groove, the locking block is inserted into the locking groove under the action of the supporting spring matched with the linkage plate, so that the connecting column is subjected to multi-stage limiting fixing, the fixing effect can be enhanced, and the later use effect is improved.

5. According to the reinforcing assembly provided by the invention, the reinforcing rods on two sides can be driven by the bidirectional screw rods to synchronously move in opposite directions or synchronously move in opposite directions by rotating the bidirectional screw rods in cooperation with the threaded holes, so that the reinforcing treatment can be carried out according to the supporting rods with different intervals, and the adaptability can be improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic bottom perspective view of the present invention.

Fig. 3 is a front cross-sectional view of the present invention.

Fig. 4 is a front sectional view of the ladder beam of the present invention.

Fig. 5 is a partial enlarged view of fig. 1 a of the present invention.

Fig. 6 is a partial enlarged view of the present invention at B of fig. 3.

Fig. 7 is a partial structural schematic view of the spacing assembly of the present invention.

Fig. 8 is a partial enlarged view of the invention at Y of fig. 7.

Figure 9 is a cut-away view of the stop assembly of the present invention.

Fig. 10 is a partial enlarged view of the invention at C of fig. 3.

Fig. 11 is a partial structural schematic view of a reinforcement assembly of the present invention.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

As shown in fig. 1 to 11, the prefabricated steel structure staircase for assembly type buildings comprises ladder beams 1, supporting units 2 and stair plates 3, wherein the ladder beams 1 are symmetrically arranged, slots 11 are formed in the upper ends of the ladder beams 1 at equal intervals, positioning grooves 12 are symmetrically formed in the lower sides of the slots 11, the stair plates 3 are arranged on the opposite sides of the ladder beams 1 at equal intervals through the supporting units 2, the stair plates 3 are of L-shaped structures, and reinforcing irons 31 are respectively and fixedly arranged at the connection positions of the horizontal sections and the vertical sections of the stair plates 3 and an L-shaped fixing plate 21; the use strength of the stair boards 3 can be enhanced through the reinforcing iron 31, so that the fixing effect between the stair boards 3 and the L-shaped fixing plate 21 can be improved, wherein:

the supporting unit 2 comprises an L-shaped fixing plate 21, a positioning hole 22, a screw 23, a supporting rod 24, a connecting column 25, a limiting component 26, a clamping component 27 and a reinforcing component 28, wherein: the L-shaped fixing plate 21 is fixedly installed on the opposite side of the ladder beam 1 at equal intervals, the stair plate 3 is installed at the upper end of the L-shaped fixing plate 21, the horizontal section and the vertical section of the L-shaped fixing plate 21 are respectively provided with positioning holes 22 at equal intervals, screws 23 are inserted into the positioning holes 22, the supporting rod 24 is arranged in the slot 11, the middle of the supporting rod 24 extends downwards to be provided with a T-shaped sliding groove 241, the lower side of the T-shaped sliding groove 241 is symmetrically provided with clamping grooves 242, the lower end of the clamping groove 242 is provided with a limiting sliding groove 243, the limiting assembly 26 is arranged in the T-shaped sliding groove 241, the upper ends of the supporting rods 24 are jointly provided with connecting columns 25 through clamping assemblies 27, the lower ends of the connecting columns 25 are provided with fixing grooves 251 matched with the supporting rods 24 at equal intervals, and the upper ends of the fixing grooves 251 are symmetrically provided with locking grooves 252; a reinforcing component 28 is arranged between the adjacent support rods 24;

when the working is carried out, a worker places the stair boards 3 on the L-shaped fixed plate 21, so that the horizontal sections of the stair boards 3 are attached to the vertical sections of the L-shaped fixed plate 21, the vertical sections of the stair boards 3 are attached to the horizontal sections of the L-shaped fixed plate 21, and then the worker adjusts the placing position of the stair boards 3 according to the processing requirement, thereby improving the installation precision of the stair boards 3, after the adjustment is finished, the worker fixes the stair boards 3 on the L-shaped fixing plate 21 through the screws 23, so as to fix the stair tread 3, the L-shaped fixing plate 21 can support the stair tread 3 during the period, so as to strengthen the use strength of the stair tread 3, prolong the service life of the stair tread 3, and then fix bracing piece 24 on ladder beam 1 through spacing subassembly 26, and can fix bracing piece 24 and spliced pole 25 through joint subassembly 27, and then consolidate fixedly to spliced pole 25 through consolidating subassembly 28.

The limiting assembly 26 comprises a T-shaped rod 261, a return spring 262, a push rod 263, a moving block 264, a baffle 265, a telescopic spring 266 and a limiting block 267, wherein: the T-shaped rod 261 is slidably arranged in the T-shaped sliding groove 241, and the lower end of the T-shaped rod 261 is of a triangular structure which is convenient for extruding the limiting block 267 to two sides; the lower end of the T-shaped rod 261 is provided with a return spring 262 arranged at the lower end of the T-shaped chute 241, push rods 263 are hinged along the lower side of the T-shaped rod 261 in a bilateral symmetry manner, the other end of the push rod 263 is hinged with a moving block 264 arranged in a limiting chute 243 in a sliding manner, the baffle 265 is arranged in the positioning groove 12 in a sliding manner through an expansion spring 266, the other end of the baffle 265 is provided with a limiting block 267 extending into the T-shaped chute 241, and the limiting block 267 is of a structure which is convenient for being matched with the T-shaped rod 261 and gradually inclines towards one side of the T-shaped rod 261 from top to bottom;

during specific work, a worker inserts the support rod 24 into the slot 11, the lower end of the support rod 24 extrudes the limit block 267 to two sides, at the moment, the worker continuously presses the support rod 24 downwards, and when the clamping groove 242 moves to the limit block 267, the limit block 267 is inserted into the clamping groove 242 under the action of the telescopic spring 266 matched with the baffle 265, so that the support rod 24 is limited and fixed, and the operation is convenient; when the support rod 24 needs to be detached, a worker presses the T-shaped rod 261, and when the T-shaped rod 261 is pressed downwards, the limit block 267 can be pressed towards two sides through the inclined structure, so that the limit block 267 can be prevented from being interfered, and the operation is convenient; the T-shaped rod 261 can swing the push rods 263 at the two sides outwards at the same time, and the push rods 263 can push the moving block 264 outwards, so that the moving block 264 can push the limit blocks 267 to the two sides, the limit blocks 267 can be separated from the clamping grooves 242, and the limit blocks can be retracted into the positioning grooves 12, and the limit effect on the support rod 24 can be eliminated, so that the support rod 24 can be conveniently detached, and the structure is simple; after the disassembly is completed, the T-shaped rod 261 retracts upwards to be reset under the action of the return spring 262, and the T-shaped rod 261 drives the moving block 264 to retract to be reset through the push rod 263.

The clamping assembly 27 comprises a convex sliding groove 271, a supporting spring 272, a linkage plate 273 and a locking block 274, wherein: the convex sliding groove 271 is symmetrically arranged on one side of the support rod 24 away from the slot 11, a support spring 272 is arranged in the convex sliding groove 271, the other end of the support spring 272 is provided with a linkage plate 273 which is slidably arranged in the convex sliding groove 271, and a locking block 274 which is matched with the locking groove 252 is arranged on one side of the linkage plate 273 away from the support spring 272; when the worker installs the connecting column 25 on the supporting rod 24, the supporting rod 24 is inserted into the fixing groove 251, the locking block 274 contracts into the convex sliding groove 271 under the extrusion of the fixing groove 251, the worker presses the supporting rod 24 downwards at the moment, when the locking block 274 is located at the locking groove 252, the locking block 274 is inserted into the locking groove 252 under the effect of the supporting spring 272 matched with the linkage plate 273, the connecting column 25 is subjected to multi-stage limiting fixing, and the fixing effect can be enhanced.

The reinforcing assembly 28 includes a reinforcing rod 281, a connecting groove 282, a positioning plate 283 and a bidirectional screw 284, wherein: a reinforcing rod 281 is fixedly arranged between every two adjacent supporting rods 24, a connecting groove 282 is formed in one side, away from the supporting rod 24, of the reinforcing rod 281, threaded holes are formed in one side, away from the supporting rod 24, of the connecting groove 282, a positioning plate 283 is rotationally arranged in the connecting groove 282, and two-way screws 284 matched with the threaded holes are jointly connected to one side, away from the supporting rod 24, of the positioning plate 283; during specific work, a worker rotates the two-way screw 284, so that the two-way screw 284 is matched with the threaded hole to drive the reinforcing rods 281 on two sides to synchronously move in opposite directions or synchronously move in opposite directions, and reinforcement treatment can be performed according to the supporting rods 24 at different intervals, so that the adaptability can be improved.

During operation

The first step is as follows: a worker places the stair boards 3 on the L-shaped fixing plate 21, so that the horizontal sections of the stair boards 3 are attached to the vertical sections of the L-shaped fixing plate 21, the vertical sections of the stair boards 3 are attached to the horizontal sections of the L-shaped fixing plate 21, the worker adjusts the placement positions of the stair boards 3 according to the processing requirements, the mounting precision of the stair boards 3 can be improved, after the adjustment is completed, the worker fixes the stair boards 3 on the L-shaped fixing plate 21 through the screws 23 to fix the stair boards 3, the L-shaped fixing plate 21 can support the stair boards 3 during the adjustment, the service strength of the stair boards 3 is enhanced, the service life of the stair boards 3 is prolonged, and the worker performs secondary welding and fixing on the joints of the L-shaped fixing plate 21 and the stair boards 3, so that the fixing effect is enhanced;

the second step is that: a worker inserts the support rod 24 into the slot 11, the lower end of the support rod 24 presses the limit block 267 to two sides, the worker presses the support rod 24 downwards, and when the clamping groove 242 moves to the limit block 267, the limit block 267 is inserted into the clamping groove 242 under the action of the telescopic spring 266 and the baffle 265, so that the support rod 24 is limited and fixed, and the operation is convenient;

the third step: when a worker installs the connecting column 25 on the supporting rod 24, the supporting rod 24 is inserted into the fixing groove 251, the locking block 274 is contracted into the convex sliding groove 271 under the extrusion of the fixing groove 251, at the moment, the worker continuously presses the supporting rod 24 downwards, and when the locking block 274 is positioned at the locking groove 252, the locking block 274 is inserted into the locking groove 252 under the action of the supporting spring 272 matched with the linkage plate 273, so that the connecting column 25 is subjected to multi-stage limiting fixing, and the fixing effect can be enhanced;

the fourth step: workers rotate the two-way screw 284 to enable the two-way screw 284 to be matched with the threaded hole to drive the reinforcing rods 281 on two sides to synchronously move in opposite directions or synchronously move in opposite directions, and reinforcing treatment can be carried out according to the supporting rods 24 with different intervals, so that the adaptability can be improved;

the fifth step: when the supporting rod 24 needs to be detached, a worker presses the T-shaped rod 261, when the T-shaped rod 261 is pressed downwards, the limiting block 267 can be extruded towards two sides through the inclined structure, so that interference of the limiting block 267 can be avoided, the operation is convenient, the T-shaped rod 261 can enable the push rods 263 on two sides to swing towards the outer side simultaneously, the push rods 263 enable the moving block 264 to push the moving block 264 towards the outer side, the moving block 264 enables the limiting block 267 to push towards two sides, the limiting block 267 is enabled to be separated from the clamping groove 242, the limiting block 267 is enabled to be retracted into the positioning groove 12, the limiting effect on the supporting rod 24 is eliminated, and the supporting rod 24 is detached conveniently.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides an assembled building prefabricated steel structure stair, includes terraced roof beam (1), support element (2) and stair tread (3), its characterized in that: ladder roof beam (1) symmetry sets up, and slot (11) have been seted up to ladder roof beam (1) upper end equidistant, and constant head tank (12) have been seted up to slot (11) downside symmetry, and equidistant installation in ladder roof beam (1) opposite side is passed through supporting element (2) in stair board (3), wherein:

support element (2) include L type fixed plate (21), locating hole (22), screw (23), bracing piece (24), spliced pole (25), spacing subassembly (26), joint subassembly (27) and reinforcement subassembly (28), wherein: l type fixed plate (21) equidistant fixed mounting is in terraced roof beam (1) opposite side, stair board (3) are installed to L type fixed plate (21) upper end, locating hole (22) have been seted up to the horizontal segment and the vertical section of L type fixed plate (21) equidistant respectively, screw (23) are pegged graft in locating hole (22), bracing piece (24) set up in slot (11), T type spout (241) have been seted up to bracing piece (24) middle part downwardly extending, chucking groove (242) have been seted up to T type spout (241) downside symmetry, spacing spout (243) have been seted up to chucking groove (242) lower extreme, spacing subassembly (26) set up in T type spout (241), and bracing piece (24) upper end installs spliced pole (25) jointly through joint subassembly (27), install between adjacent bracing piece (24) and consolidate subassembly (28).

2. The prefabricated steel structure stair of fabricated building of claim 1, wherein: spacing subassembly (26) include T type pole (261), reset spring (262), push rod (263), movable block (264), baffle (265), expanding spring (266) and stopper (267), wherein: t type pole (261) slide and set up in T type spout (241), reset spring (262) of setting at T type spout (241) lower extreme are installed to T type pole (261) lower extreme, it has push rod (263) to articulate along T type pole (261) downside bilateral symmetry, the push rod (263) other end articulates there is movable block (264) that slides and set up in spacing spout (243), baffle (265) slide through expanding spring (266) and set up in constant head tank (12), and baffle (265) other end is installed and is extended to stopper (267) in T type spout (241).

3. The prefabricated steel structure stair of fabricated building of claim 1, wherein: the lower end of the connecting column (25) is provided with fixing grooves (251) which are matched with the supporting rod (24) at equal intervals, and the upper ends of the fixing grooves (251) are symmetrically provided with locking grooves (252).

4. The prefabricated steel structure stair of fabricated building of claim 3, wherein: the clamping assembly (27) comprises a convex sliding groove (271), a supporting spring (272), a linkage plate (273) and a locking block (274), wherein: the supporting rod (24) is symmetrically arranged on one side, away from the slot (11), of the convex sliding groove (271), the supporting spring (272) is installed in the convex sliding groove (271), the other end of the supporting spring (272) is provided with the linkage plate (273) which is slidably arranged in the convex sliding groove (271), and the linkage plate (273) is far away from one side, away from the supporting spring (272), of the linkage plate (273) and is provided with the locking block (274) matched with the locking groove (252).

5. The prefabricated steel structure stair of fabricated building of claim 1, wherein: the reinforcing component (28) comprises a reinforcing rod (281), a connecting groove (282), a positioning plate (283) and a bidirectional screw (284), wherein: adjacent equal fixed mounting has reinforcing bar (281) between bracing piece (24), and reinforcing bar (281) keep away from bracing piece (24) one side and have all seted up spread groove (282), and spread groove (282) keep away from bracing piece (24) one side and have all seted up the screw hole, and spread groove (282) internal rotation is provided with locating plate (283), and locating plate (283) keep away from bracing piece (24) one side and be connected with two-way screw rod (284) with screw hole matched with jointly.

6. The prefabricated steel structure stair of fabricated building of claim 1, wherein: the stair plates (3) are of L-shaped structures, and reinforcing irons (31) are fixedly installed at the joints of the horizontal sections and the vertical sections of the stair plates (3) and the L-shaped fixing plates (21) respectively.

7. The prefabricated steel structure stair of fabricated building of claim 2, wherein: the lower end of the T-shaped rod (261) is of a triangular structure which is convenient for extruding the limiting block (267) towards two sides.

8. The prefabricated steel structure stair of fabricated building of claim 7, wherein: the limiting block (267) is of a structure which is convenient to match with the T-shaped rod (261) and gradually inclines to one side of the T-shaped rod (261) from top to bottom.