A UHPC assembled precast staircase structure and its construction method

Abstract

This application relates to a UHPC prefabricated assembled staircase structure, which includes an upper steel staircase beam, a lower steel staircase beam and a number of precast unit steps. The upper steel staircase beam is installed on the upper supporting platform, the lower steel staircase beam is installed on the lower supporting platform, both the upper steel staircase beam and the lower steel staircase beam are provided with staircase beam grooves for placing the precast unit steps, both the upper steel staircase beam and the lower steel staircase beam are provided with fixing components for fixing the precast unit steps in the staircase beam grooves, and the precast unit steps are further provided with connecting components for fixing the next precast unit step. This application has the effect of making the assembled staircase more convenient during construction and installation.

Description

Technical Field

[0001] This application relates to the technical field of prefabricated buildings, and particularly relates to a UHPC prefabricated staircase structure and its construction method. Background Art

[0002] A prefabricated building refers to a building in which a large amount of on-site work in the traditional construction method is transferred to a factory. Building components and fittings, such as floor slabs, wall panels, staircases, balconies, etc., are processed and manufactured in the factory and transported to the construction site of the building, and are assembled and installed on-site through reliable connection methods. Prefabricated buildings mainly include precast prefabricated concrete structures, steel structures, modern timber structures, etc. Because of their standardized design, factory production, assembly construction, information management, and intelligent application, they are representatives of modern industrial production methods.

[0003] Currently, when constructing the staircase of a prefabricated building, it is necessary to build the support platforms for each floor slab at the construction location, install the steel staircase beams on the support platforms of adjacent floors respectively, and then use a tower crane to hoist the prefabricated staircase to the designated position, so that the two ends of the prefabricated staircase are respectively clamped into the beam grooves of the steel staircase beams on the support platforms of adjacent floors, and the two ends of the prefabricated staircase are respectively fixed to the steel staircase beams to complete the construction of the prefabricated staircase.

[0004] However, the existing prefabricated staircase is large in volume and heavy in weight, and a sufficiently large construction space needs to be reserved when hoisting the prefabricated staircase, which is very inconvenient when hoisting the prefabricated staircase. Summary of the Invention

[0005] In order to solve the problem of inconvenient hoisting of the prefabricated staircase, this application provides a UHPC prefabricated staircase structure and its construction method.

[0006] In a first aspect, a UHPC prefabricated staircase structure provided by this application adopts the following technical solution:

[0007] A UHPC prefabricated staircase structure includes an upper steel staircase beam, a lower steel staircase beam, and several precast unit steps. The upper steel staircase beam is installed on the upper support platform, the lower steel staircase beam is installed on the lower support platform, both the upper steel staircase beam and the lower steel staircase beam are provided with beam grooves for placing the precast unit steps, both the upper steel staircase beam and the lower steel staircase beam are provided with fixing components for fixing the precast unit steps in the beam grooves, and the precast unit steps are further provided with connecting components for fixing the next precast unit step.

[0008] By adopting the above technical solution, when constructing the stairs of the prefabricated building, the upper steel ladder beam and the lower steel ladder beam are respectively installed on the upper and lower supporting platforms, and several prefabricated unit steps are transported to the construction site, one of the prefabricated unit steps is placed in the ladder beam groove of the lower steel ladder beam, and the prefabricated unit step is fixed by the fixing component, and then the prefabricated unit steps are assembled and fixed in sequence by the connecting components. When the prefabricated unit step of the uppermost layer is placed in the ladder beam groove of the upper steel ladder beam, the prefabricated unit step of the uppermost layer is fixed in the ladder beam groove of the upper steel ladder beam by the fixing component, and the construction of the prefabricated staircase is completed; the prefabricated staircase is split into several prefabricated unit steps, and the prefabricated unit steps can be transported to the site for installation in batches by the construction elevator, which removes the limitation of tower crane lifting and makes the prefabricated staircase more convenient during construction and installation.

[0009] Optionally, it also includes a support beam, which is used to be fixed on the upper supporting platform, a sliding groove is provided on the support beam along the length direction of the support beam, a slider is slidingly arranged in the sliding groove, a first fixing part is provided on the support beam for preventing the slider from sliding, a mounting frame is provided on the slider for sliding along the horizontal direction, and the sliding direction of the mounting frame is perpendicular to the length direction of the support beam, a second fixing part is provided on the mounting frame for preventing the slider from sliding, and the upper steel ladder beam is arranged on the mounting frame.

[0010] By adopting the above technical solution, the upper steel ladder beam is prone to position deviation during installation. By pushing the slider to slide on the support beam, the upper steel ladder beam is driven to move left and right. By driving the mounting frame to slide on the slider, the upper steel ladder beam is driven to move forward and backward, thereby adjusting the horizontal position of the upper steel ladder beam, making it easier for the prefabricated unit steps to be connected to the upper steel ladder beam.

[0011] Optionally, a mounting groove is provided on the mounting frame in a vertical direction, the upper steel ladder beam is slidably arranged in the mounting groove in a vertical direction, and a lifting component for lifting the upper steel ladder beam is provided on the mounting frame.

[0012] By adopting the above technical solution, the upper steel ladder beam is driven to rise and fall by the jacking component, and the position of the upper steel ladder beam in the vertical direction is adjusted, thereby further improving the convenience of connecting the prefabricated unit steps with the upper steel ladder beam.

[0013] Optionally, the jacking assembly includes a jacking bolt and a screw sleeve, the jacking bolt is rotatably set on the upper steel ladder beam, and the axial direction of the jacking bolt is parallel to the sliding direction of the upper steel ladder beam, the screw sleeve is fixedly set in the installation groove, and the screw sleeve is parallel to the axial direction of the jacking screw, and the jacking screw is passed through the screw sleeve and is threadedly connected to the screw sleeve.

[0014] By adopting the above technical solution, the jacking screw can be driven to move axially in the screw sleeve by rotating the jacking screw, and the upper steel ladder beam can be driven to move up and down.

[0015] Optionally, a grouting bag is arranged in the installation groove, and a grouting pipe is fixedly arranged on the installation frame. The grouting pipe is communicated with the grouting bag.

[0016] By adopting the above technical solution, after the precast unit step of the prefabricated staircase is docked with the upper steel staircase beam, cement mortar is injected into the grouting bag through the grouting pipe. After the cement mortar solidifies, the upper steel staircase beam is supported by the cement mortar, increasing the stability of the structure of the prefabricated staircase.

[0017] Optionally, the connection assembly includes a connection frame, a first bolt and a second bolt. The precast unit step includes a horizontal section and a vertical section. The horizontal section and the vertical section are integrally formed. At least two of the first bolts are fixedly arranged on the bottom wall of the horizontal section. The second bolt is fixedly arranged on the side wall of the vertical section away from the horizontal section. Nuts are threadedly connected to both the first bolt and the second bolt;

[0018] The connection frame is in a Z shape and includes a lower horizontal section, an upper horizontal section and a longitudinal section. The lower horizontal section is used to abut against the bottom wall of the horizontal section of the lower precast unit step. The longitudinal section is used to abut against the side wall of the vertical section of the lower precast unit step away from the horizontal section. The upper horizontal section is used to abut against the bottom wall of the horizontal section of the upper precast unit step. First through holes for the first bolts to pass through are formed in both the lower horizontal section and the upper horizontal section. A second through hole for the second bolt to pass through is formed in the longitudinal section.

[0019] By adopting the above technical solution, the connection frame is placed at the joint of two adjacent precast unit steps, so that the lower horizontal section of the connection frame abuts against the bottom wall of the horizontal section of the lower precast unit step, the longitudinal section of the connection frame abuts against the side wall of the vertical section of the lower precast unit step away from the horizontal section, the upper horizontal section of the connection frame abuts against the bottom wall of the horizontal section of the upper precast unit step, and the first bolts on the horizontal sections of the upper and lower precast unit steps are respectively inserted into the first through holes in the lower horizontal section and the upper horizontal section, and the second bolt on the vertical section of the lower precast unit step is inserted into the second through hole in the longitudinal section. Then nuts are respectively sleeved on the first bolt and the second bolt and tightened to complete the connection and fixation of two adjacent precast unit steps.

[0020] Optionally, a rib plate is arranged between the upper horizontal section and the longitudinal section.

[0021] By adopting the above technical solution, the upper horizontal section of the connection frame mainly bears the load from the upper precast unit step, and the rib plate increases the stability of the joint between the upper horizontal section and the longitudinal section.

[0022] Optionally, the fixing component includes a pressure strip and a third fixing member. Plugging holes for inserting first bolts are formed in the bottom walls of the ladder beam grooves. Guide grooves communicating with the installation grooves are formed in the two side walls of the ladder beam grooves. The two sides of the pressure strip are respectively slidably arranged in the two guide grooves. The pressure strip is used to press against the top wall of the horizontal section, and the third fixing member is used to prevent the pressure strip from sliding in the guide groove.

[0023] By adopting the above technical solution, since there are at least two first bolts arranged on the horizontal section, when the precast unit step is placed in the ladder beam groove, the first bolts on the horizontal section that do not participate in the installation of the connecting frame are inserted into the plugging holes, thereby preventing the precast unit step from horizontally moving in the ladder beam groove. After that, by sliding the pressure strip, the pressure strip is pressed against the top wall of the horizontal section, and the third fixing member is used to prevent the pressure strip from sliding in the guide groove, thereby preventing the precast unit step from longitudinally sliding in the ladder beam groove, so as to fix the precast unit step in the ladder beam groove of the upper steel ladder beam or the lower steel ladder beam.

[0024] In a second aspect, the present application provides a construction method for a UHPC assembled precast staircase structure, adopting the following technical solution:

[0025] A construction method for a UHPC assembled precast staircase structure includes the following steps:

[0026] S1. Install the lower steel ladder beam on the lower supporting platform and fix the support beam on the upper supporting platform.

[0027] S2. Transport a plurality of precast unit steps to the construction site, place one of the precast unit steps in the ladder beam groove of the lower steel ladder beam, fix the precast unit step through the fixing component, and then sequentially assemble and fix the precast unit steps through the connecting component.

[0028] S3. When the topmost precast unit step is butted against the upper steel ladder beam, by pushing the slider to slide on the support beam, drive the upper steel ladder beam to move left and right, by driving the mounting frame to slide on the slider, drive the upper steel ladder beam to move back and forth, and prevent the slider from sliding through the first fixing member, prevent the relative sliding between the slider and the mounting frame through the second fixing member, adjust the horizontal position of the upper steel ladder beam, drive the upper steel ladder beam to lift and lower through the jacking component, adjust the position of the upper steel ladder beam in the vertical direction, so as to place the precast unit step in the ladder beam groove of the upper steel ladder beam, and then fix the topmost precast unit step in the ladder beam groove of the upper steel ladder beam through the fixing component.

[0029] S4. Inject cement mortar into the grouting bag through the grouting pipe. After the cement mortar solidifies, support the upper steel ladder beam through the cement mortar to complete the construction of the assembled staircase.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. When constructing the stairs of prefabricated buildings, install the upper steel ladder beam and the lower steel ladder beam on the supporting platforms of the upper and lower floors respectively. Transport several precast unit steps to the construction site, place one of the precast unit steps in the ladder beam groove of the lower steel ladder beam, and fix the precast unit step through the fixing component. Then, sequentially assemble and fix the precast unit steps through the connecting component. When the topmost precast unit step is placed in the ladder beam groove of the upper steel ladder beam, fix the topmost precast unit step in the ladder beam groove of the upper steel ladder beam through the fixing component to complete the construction of the prefabricated stairs; split the prefabricated stairs into several precast unit steps, and the precast unit steps can be transported to the site for installation in batches by the construction elevator, removing the limitation of tower crane hoisting and making the construction and installation of the prefabricated stairs more convenient;

[0032] 2. When installing the upper steel ladder beam, deviation in position is likely to occur. By pushing the slider to slide on the support beam, drive the upper steel ladder beam to move left and right. By driving the mounting frame to slide on the slider, drive the upper steel ladder beam to move back and forth, thereby adjusting the horizontal position of the upper steel ladder beam to facilitate the docking of the precast unit step with the upper steel ladder beam;

[0033] 3. Place the connecting frame at the joint of two adjacent precast unit steps, make the lower cross section of the connecting frame abut against the bottom wall of the horizontal section of the lower precast unit step, the longitudinal section of the connecting frame abut against the side wall of the vertical section of the lower precast unit step far from the horizontal section, the upper cross section of the connecting frame abut against the bottom wall of the horizontal section of the upper precast unit step, and make the first bolts on the horizontal sections of the upper and lower precast unit steps respectively insert into the first through holes on the lower cross section and the upper cross section, and make the second bolts on the vertical section of the lower precast unit step insert into the second through holes on the longitudinal section. Then, put nuts on the first bolts and the second bolts respectively and tighten them to complete the connection and fixation of two adjacent precast unit steps. Description of the Drawings

[0034] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0035] Figure 2 is the exploded view of the partial structure of the embodiment of the present application, mainly used to express the installation structure of the upper steel ladder beam;

[0036] Figure 3 is the exploded view of the structure of the embodiment of the present application, mainly used to express the installation relationship between the mounting frame and the upper steel ladder beam;

[0037] Figure 4 is the partial structural schematic diagram of the embodiment of the present application, mainly used to express the structural schematic diagram of the connecting component;

[0038] Figure 5It is a partial structural schematic diagram of an embodiment of the present application, mainly used to express the installation relationship between the precast unit step and the lower steel ladder beam.

[0039] Explanation of reference numerals: 1, lower steel ladder beam; 2, support beam; 21, chute; 22, slider; 23, support rod; 24, first fixing member; 25, first kidney-shaped groove; 3, mounting frame; 31, T-shaped groove; 32, second fixing member; 33, second kidney-shaped groove; 34, mounting groove; 35, guiding cylinder; 36, grouting bag; 37, grouting pipe; 4, upper steel ladder beam; 41, guiding rod; 52, vertical section; 5, precast unit step; 51, horizontal section; 6, fixing assembly; 61, pressing strip; 62, third fixing member; 7, connecting assembly; 71, connecting frame; 711, lower horizontal section; 712, upper horizontal section; 713, longitudinal section; 72, first bolt; 73, second bolt; 8, jacking assembly; 81, jacking bolt; 82, screw sleeve. Detailed implementation manners

[0040] The following will Figures 1-5 further elaborate on the present application in detail.

[0041] An embodiment of the present application discloses a UHPC assembled precast staircase structure. Referring to Figure 1 , it includes a lower steel ladder beam 1 fixedly arranged on the lower support platform, a support beam 2 fixedly arranged on the upper support platform, a mounting frame 3 slidably arranged on the support beam 2, an upper steel ladder beam 4 slidably arranged vertically on the mounting frame 3, and a plurality of precast unit steps 5. Ladder beam grooves are provided on both the upper steel ladder beam 4 and the lower steel ladder beam 1, and fixing assemblies 6 for fixing the precast unit steps 5 are provided on both the upper steel ladder beam 4 and the lower steel ladder beam 1. A connecting assembly 7 for fixing the next precast unit step 5 is further provided on the precast unit step 5.

[0042] Referring to Figure 1 , 2 , two support beams 2 are provided. The lower steel ladder beam 1 and the two support beams 2 are fixed by bolts or directly welded to the support platform. When installing the lower steel ladder beam 1 and the support beam 2, it is necessary to ensure that the length directions of the lower steel ladder beam 1 and the support beam 2 are horizontal. The two support beams 2 are on the same horizontal plane, and the length directions of the two support beams 2 are parallel to the length direction of the lower steel ladder beam 1.

[0043] Referring to Figure 2, chute grooves 21 are provided along the length direction of the top walls of the two support beams 2. Two sliders 22 are respectively and slidably arranged in the chute grooves 21 of the two support beams 2. The sliders 22 on the two support beams 2 correspond to each other one by one. A support rod 23 is fixedly arranged on the two corresponding sliders 22 together. The length direction of the support rod 23 is horizontal and perpendicular to the length direction of the support beam 2, and the length directions of the two support rods 23 are parallel. The cross section of the support rod 23 is T-shaped. Two T-shaped grooves 31 adapted to the support rod 23 are provided on the mounting frame 3. The two ends of the two T-shaped grooves 31 penetrate through the side walls of the mounting frame 3, and the two support rods 23 are respectively used for inserting into the two T-shaped grooves 31 of the mounting frame 3.

[0044] Refer to Figure 2 , the slider 22 is detachably arranged in the chute groove 21 of the support beam 2. A first fixing member 24 for preventing the slider 22 from sliding is arranged on the support beam 2. The first fixing member 24 includes a first tightening bolt. First kidney-shaped grooves 25 communicating with the chute groove 21 are provided along the length direction of the side walls of the two support beams 2. First threaded holes adapted to the first tightening bolt are provided on the side walls of each slider 22. When the slider 22 is placed in the chute groove 21, the positions of the first threaded holes and the first kidney-shaped grooves 25 correspond to each other.

[0045] Refer to Figure 2 , a second fixing member 32 for preventing the slider 22 from sliding is arranged on the mounting frame 3. The second fixing member 32 includes a second tightening bolt. Two second kidney-shaped grooves 33 are respectively provided on the two side walls of the mounting frame 3. One of the second kidney-shaped grooves 33 communicates with one of the T-shaped grooves 31, and the other second kidney-shaped groove 33 communicates with the other T-shaped groove 31. A second threaded hole adapted to the second tightening bolt is provided on the side wall of the support rod 23. After the support rod 23 is inserted into the two T-shaped grooves 31 on the mounting frame 3, the positions of the second kidney-shaped grooves 33 and the second threaded holes correspond to each other.

[0046] After the support beam 2 is installed and fixed, the two support rods 23 are erected on the two support beams 2, and the two sliders 22 on the support rods 23 are respectively and slidably arranged in the chute grooves 21 of the two support beams 2. The first tightening bolt is inserted into the first threaded hole. Then the mounting frame 3 is erected on the two support rods 23, and the two support rods 23 are respectively inserted into the two T-shaped grooves 31 of the mounting frame 3. The second tightening bolt is inserted into the second threaded hole. By pushing the slider 22 to slide on the support beam 2, the upper steel ladder beam 4 is driven to move left and right. By driving the mounting frame 3 to slide on the support rod 23, the upper steel ladder beam 4 is driven to move back and forth, so as to adjust the horizontal position of the upper steel ladder beam 4, which is convenient for the precast unit steps 5 to be butted with the upper steel ladder beam 4. After the position of the mounting frame 3 is adjusted, by tightening the first tightening bolt and the second tightening bolt, the mounting frame 3 can be fixed on the support beam 2.

[0047] Refer to Figure 2 、3 , an installation groove 34 is vertically formed on the mounting frame 3, the upper steel ladder beam 4 is slidably arranged in the installation groove 34 in the vertical direction, two guide cylinders 35 are fixedly arranged on the bottom wall of the installation groove 34, the axial directions of the two guide cylinders 35 are vertical, two guide rods 41 are fixedly arranged on the bottom wall of the upper steel ladder beam 4, the length directions of the two guide rods 41 are vertical and correspond to the two guide cylinders 35 one by one, and the two guide rods 41 are respectively slidably inserted into the corresponding guide cylinders 35.

[0048] Refer to Figure 3 , a jacking assembly 8 for jacking up the upper steel ladder beam 4 is arranged on the mounting frame 3. The jacking assembly 8 includes a jacking bolt 81 and a screw sleeve 82. An installation hole is vertically formed on the bottom wall of the ladder beam groove, and a countersunk head groove communicating with the installation hole is also formed on the bottom wall of the ladder beam groove. The jacking screw rod is inserted through the installation hole and is rotatably connected with the upper steel ladder beam 4. An annular block is fixedly arranged on the side wall of the jacking screw rod, an annular groove is formed on the side wall of the installation hole, and the annular block is rotatably arranged in the annular groove. The head of the jacking screw rod is located in the countersunk head groove. The screw sleeve 82 is fixedly arranged in the installation groove 34, and the screw sleeve 82 is parallel to the axial direction of the jacking screw rod. The jacking screw rod is inserted through the screw sleeve 82 and is in threaded connection with the screw sleeve 82; by rotating the jacking screw rod, the jacking screw rod can be driven to move axially in the screw sleeve 82, and the upper steel ladder beam 4 can be driven to move up and down, so as to adjust the position of the upper steel ladder beam 4 in the vertical direction, and further improve the convenience when the precast unit step 5 is butted with the upper steel ladder beam 4.

[0049] Refer to Figure 2 , 3 , a grouting bag 36 is arranged in the installation groove 34, a grouting pipe 37 is fixedly arranged on the mounting frame 3, the grouting pipe 37 is communicated with the grouting bag 36, and the grouting bag 36 is made of PVC transparent plastic material; after the precast unit step 5 of the assembled staircase is butted with the upper steel ladder beam 4, cement mortar is injected into the grouting bag 36 through the grouting pipe 37. After the cement mortar solidifies, the upper steel ladder beam 4 is supported by the cement mortar, so as to increase the stability of the assembled staircase structure.

[0050] Refer to Figure 4 , the cross section of the precast unit step 5 is L-shaped, and an L-shaped steel plate is embedded in the precast unit step 5. The precast unit step 5 includes a horizontal section 51 and a vertical section 52, the horizontal section 51 and the vertical section 52 are integrally formed. The connecting assembly 7 includes a connecting frame 71, a first bolt 72 and a second bolt 73. Four first bolts 72 are fixedly arranged on the bottom wall of the horizontal section 51, one end of the first bolt 72 is embedded in the horizontal section 51 and is welded to the steel plate, two second bolts 73 are fixedly arranged on the side wall of the vertical section 52 far away from the horizontal section 51, one end of the two second bolts 73 is embedded in the vertical section 52 and is welded to the steel plate, and nuts are threadedly connected to both the first bolt 72 and the second bolt 73.

[0051] Refer toFigure 4 The connecting frame 71 is Z-shaped. The connecting frame 71 includes a lower horizontal section 711, an upper horizontal section 712 and a vertical section 713. The lower horizontal section 711 is used to abut against the bottom wall of the horizontal section 51 of the lower precast unit step 5. The vertical section 713 is used to abut against the side wall of the vertical section 52 of the lower precast unit step 5 away from the horizontal section 51. The upper horizontal section 712 is used to abut against the bottom wall of the horizontal section 51 of the upper precast unit step 5. Two first through holes for the first bolts 72 to pass through are provided on both the lower horizontal section 711 and the upper horizontal section 712. Two second through holes for the second bolts 73 to pass through are provided on the vertical section 713. A rib plate is provided between the upper horizontal section 712 and the vertical section 713.

[0052] Place the connecting frame 71 at the joint of two adjacent precast unit steps 5, so that the lower horizontal section 711 of the connecting frame 71 abuts against the bottom wall of the horizontal section 51 of the lower precast unit step 5, the vertical section 713 of the connecting frame 71 abuts against the side wall of the vertical section 52 of the lower precast unit step 5 away from the horizontal section 51, the upper horizontal section 712 of the connecting frame 71 abuts against the bottom wall of the horizontal section 51 of the upper precast unit step 5, and two of the first bolts 72 on the horizontal sections 51 of the upper and lower precast unit steps 5 are respectively inserted into the corresponding two first through holes on the lower horizontal section 711 and the upper horizontal section 712, and the two second bolts 73 on the vertical section 52 of the lower precast unit step 5 are inserted into the two second through holes on the vertical section 713. Then, nuts are respectively sleeved on the first bolts 72 and the second bolts 73 and tightened to complete the connection and fixation of two adjacent precast unit steps 5.

[0053] Refer to Figure 2 、 5 The fixing assembly 6 includes a pressing strip 61 and a third fixing member 62. Plugging holes for two first bolts 72 to be inserted are provided on the bottom walls of the upper steel ladder beam 4 and the upper ladder beam groove of the lower steel ladder beam 1. Guide grooves communicating with the installation groove 34 are provided on both side walls of the ladder beam groove along the vertical direction. Both sides of the pressing strip 61 are slidably arranged in the two guide grooves. The pressing strip 61 is used to press against the top wall of the horizontal section 51. When the uppermost precast unit step 5 is installed and spliced with the upper steel ladder beam 4, the second bolts 73 on the vertical section 52 can be cut off first, or during pre-production in the factory, the second bolts 73 are not pre-embedded on the vertical section 52 of one of the precast unit steps 5.

[0054] Refer to Figure 5 The third fixing member 62 includes a third bolt. Fixed plates are fixedly provided on both sides of the pressing strip 61. Third through holes for the third bolt to pass through are provided on both fixed plates. Third threaded holes adapted to the third bolt are provided on both side walls of the ladder beam groove. When the pressing strip 61 abuts against the top wall of the horizontal section 51, the third through holes are aligned with the third threaded holes.

[0055] When each precast unit step 5 is assembled, two first bolts 72 on the horizontal sections 51 of the two precast unit steps 5 at the outermost sides do not participate in the installation of the connecting frame 71. Moreover, the two precast unit steps 5 at the outermost sides need to be placed in the beam grooves of the upper steel ladder beam 4 and the lower steel ladder beam 1 respectively. When the precast unit step 5 is placed into the beam groove, the two first bolts 72 on the horizontal section 51 that do not participate in the installation of the connecting frame 71 are inserted into the two insertion holes, thereby effectively preventing the precast unit step 5 from horizontally moving in the beam groove. After that, through the sliding pressing strip 61, the pressing strip 61 is pressed against the top wall of the horizontal section 51, and then the third bolt is passed through the third through hole and inserted into the third threaded hole, thereby preventing the precast unit step 5 from longitudinally sliding in the beam groove, and thus fixing the precast unit step 5 in the beam groove of the upper steel ladder beam 4 or the lower steel ladder beam 1.

[0056] The implementation principle of the UHPC assembled precast staircase structure in an embodiment of the present application is as follows: When constructing the staircase of an assembled building, the lower steel ladder beam 1 is fixedly installed on the lower support platform by bolts, two support beams 2 are fixedly installed on the upper support platform by bolts, two support rods 23 are erected on the two support beams 2, and the two sliders 22 on the support rods 23 are respectively slidably arranged in the sliding grooves 21 of the two support beams 2. The first tension bolt is inserted into the first threaded hole, and then the mounting frame 3 is erected on the two support rods 23, and the two support rods 23 are respectively inserted into the two T-shaped grooves 31 of the mounting frame 3. The second tension bolt is inserted into the second threaded hole.

[0057] A number of precast unit steps 5 are transported to the construction site. One of the precast unit steps 5 is placed in the beam groove of the lower steel ladder beam 1, and the two first bolts 72 on the side of the horizontal section 51 of the precast unit step 5 are respectively inserted into the two insertion holes on the lower steel ladder beam 1. After that, the pressing strip 61 on the lower steel ladder beam 1 is slid, so that the pressing strip 61 presses against the top wall of the horizontal section 51, and then the third bolt is passed through the third through hole and inserted into the third threaded hole, thereby fixing the precast unit step 5 in the beam groove of the lower steel ladder beam 1.

[0058] Assemble another precast unit step 5 above the already installed precast unit step 5. Place the connecting frame 71 at the connection of two adjacent precast unit steps 5, such that the lower cross-section 711 of the connecting frame 71 abuts against the bottom wall of the horizontal section 51 of the lower precast unit step 5, the longitudinal section 713 of the connecting frame 71 abuts against the side wall of the vertical section 52 of the lower precast unit step 5 that is away from the horizontal section 51, and the upper cross-section 712 of the connecting frame 71 abuts against the bottom wall of the horizontal section 51 of the upper precast unit step. Then, insert two of the first bolts 72 on the horizontal sections 51 of the upper and lower precast unit steps 5 respectively into the corresponding two first through-holes on the lower cross-section 711 and the upper cross-section 712, and insert the two second bolts 73 on the vertical section 52 of the lower precast unit step 5 into the two second through-holes on the longitudinal section 713. After that, put nuts on the first bolts 72 and the second bolts 73 respectively and tighten them to complete the connection and fixation of two adjacent precast unit steps 5. Then, repeat the above steps to assemble the remaining precast unit steps 5.

[0059] When the topmost precast unit step 5 is docked with the upper steel ladder beam 4, push the slider 22 to slide on the support beam 2, driving the upper steel ladder beam 4 to move left and right. By driving the mounting frame 3 to slide on the support rod 23, drive the upper steel ladder beam 4 to move back and forth to adjust the horizontal position of the upper steel ladder beam 4. When the position of the mounting frame 3 is adjusted, fix the mounting frame 3 on the support beam 2 by tightening the first tension bolt and the second tension bolt. By rotating the jacking screw rod, drive the jacking screw rod to move axially in the screw sleeve 82 and drive the upper steel ladder beam 4 to move up and down to adjust the position of the upper steel ladder beam 4 in the vertical direction.

[0060] When the topmost precast unit step 5 is placed in the ladder beam groove of the upper steel ladder beam 4, then fix the topmost precast unit step 5 in the ladder beam groove of the upper steel ladder beam 4 through the fixing component 6. Inject cement mortar into the grouting bag 36 through the grouting pipe 37. After the cement mortar solidifies, support the upper steel ladder beam 4 through the cement mortar to complete the construction of the prefabricated staircase; disassemble the prefabricated staircase into several precast unit steps 5, and the precast unit steps 5 can be transported to the site for installation in batches by a construction elevator, which removes the limitation of tower crane hoisting and makes the construction and installation of the prefabricated staircase more convenient.

[0061] The embodiment of the present application also discloses a construction method for a UHPC prefabricated staircase structure, including the following steps:

[0062] S1. Fix the lower steel ladder beam 1 on the lower supporting platform with bolts, and fix the two supporting beams 2 on the upper supporting platform with bolts. Ensure that the length directions of the lower steel ladder beam 1 and the supporting beams 2 are horizontal. The two supporting beams 2 are on the same horizontal plane, and the length directions of the two supporting beams 2 are parallel to the length direction of the lower steel ladder beam 1. Place the two support rods 23 on the two supporting beams 2, and make the two sliders 22 on the support rods 23 slide in the chutes 21 of the two supporting beams 2 respectively. Insert the first tension bolt into the first threaded hole, then place the mounting frame 3 on the two support rods 23, and make the two support rods 23 insert into the two T-shaped grooves 31 of the mounting frame 3 respectively. Insert the second tension bolt into the second threaded hole;

[0063] S2. Transport several precast unit steps 5 to the construction site. Place one of the precast unit steps 5 in the ladder beam groove of the lower steel ladder beam 1, and make the two first bolts 72 on the side of the horizontal section 51 of the precast unit step 5 insert into the two insertion holes on the lower steel ladder beam 1 respectively. Then, slide the pressing strip 61 on the lower steel ladder beam 1 to make the pressing strip 61 press the top wall of the horizontal section 51, and then insert the third bolt through the third through hole and into the third threaded hole, so as to fix the precast unit step 5 in the ladder beam groove of the lower steel ladder beam 1. Assemble another precast unit step 5 above the precast unit step 5 that has been installed. Place the connecting frame 71 at the joint of two adjacent precast unit steps 5, make the lower cross section 711 of the connecting frame 71 abut against the bottom wall of the horizontal section 51 of the lower precast unit step 5, the longitudinal section 713 of the connecting frame 71 abut against the side wall of the vertical section 52 of the lower precast unit step 5 away from the horizontal section 51, and the upper cross section 712 of the connecting frame 71 abut against the bottom wall of the horizontal section 51 of the upper precast unit step. Make two of the first bolts 72 on the horizontal sections 51 of the upper and lower precast unit steps 5 insert into the corresponding two first through holes on the lower cross section 711 and the upper cross section 712 respectively, and make the two second bolts 73 on the vertical section 52 of the lower precast unit step 5 insert into the two second through holes on the longitudinal section 713. Then, put nuts on the first bolts 72 and the second bolts 73 respectively and tighten them to complete the connection and fixation of two adjacent precast unit steps 5. Then, repeat the above steps to assemble the remaining precast unit steps 5;

[0064] S3. When the precast unit step 5 at the top layer is butted with the upper steel ladder beam 4, push the slider 22 to slide on the support beam 2, drive the upper steel ladder beam 4 to move left and right, drive the upper steel ladder beam 4 to move back and forth by driving the mounting frame 3 to slide on the support rod 23, and adjust the horizontal position of the upper steel ladder beam 4. After the position of the mounting frame 3 is adjusted, fix the mounting frame 3 on the support beam 2 by tightening the first tension bolt and the second tension bolt. By rotating the jacking screw rod, drive the jacking screw rod to move axially in the screw sleeve 82, and drive the upper steel ladder beam 4 to move up and down to adjust the position of the upper steel ladder beam 4 in the vertical direction. After the precast unit step 5 at the top layer is placed in the ladder beam groove of the upper steel ladder beam 4, fix the precast unit step 5 at the top layer in the ladder beam groove of the upper steel ladder beam 4 through the fixing component 6;

[0065] S4. Inject cement mortar into the grouting bag 36 through the grouting pipe 37. After the cement mortar solidifies, support the upper steel ladder beam 4 with the cement mortar to complete the construction of the prefabricated staircase.

[0066] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A UHPC prefabricated precast staircase structure, characterized in that: It includes an upper steel ladder beam (4), a lower steel ladder beam (1) and a number of precast unit steps (5). The upper steel ladder beam (4) is installed on the upper support platform, the lower steel ladder beam (1) is installed on the lower support platform. Both the upper steel ladder beam (4) and the lower steel ladder beam (1) are provided with ladder beam grooves for placing the precast unit steps (5). Both the upper steel ladder beam (4) and the lower steel ladder beam (1) are provided with fixing components (6) for fixing the precast unit steps (5) in the ladder beam grooves. The precast unit steps (5) are also provided with connecting components (7) for fixing the next precast unit step (5). The connecting component (7) includes a connecting frame (71), a first bolt (72) and a second bolt (73). The precast unit step (5) includes a horizontal section (51) and a vertical section (52). The horizontal section (51) and the vertical section (52) are integrally formed. At least two of the first bolts (72) are fixedly arranged on the bottom wall of the horizontal section (51). The second bolt (73) is fixedly arranged on the side wall of the vertical section (52) away from the horizontal section (51). Nuts are threadedly connected to both the first bolt (72) and the second bolt (73). The connecting frame (71) is Z-shaped. The connecting frame (71) includes a lower cross section (711), an upper cross section (712) and a longitudinal section (713). The lower cross section (711) is used to abut against the bottom wall of the horizontal section (51) of the lower precast unit step (5). The longitudinal section (713) is used to abut against the side wall of the vertical section (52) of the lower precast unit step (5) away from the horizontal section (51). The upper cross section (712) is used to abut against the bottom wall of the horizontal section (51) of the upper precast unit step (5). First through holes for the first bolt (72) to pass through are provided on both the lower cross section (711) and the upper cross section (712). A second through hole for the second bolt (73) to pass through is provided on the longitudinal section (713). The fixing component (6) includes a pressing strip (61) and a third fixing member (62). Plugging holes for the first bolt (72) to be inserted are provided on the bottom walls of the ladder beam grooves. Guide grooves communicating with the installation grooves (34) are provided on both side walls of the ladder beam grooves. Both sides of the pressing strip (61) are slidably arranged in the two guide grooves respectively. The pressing strip (61) is used to press the top wall of the horizontal section (51). The third fixing member (62) is used to prevent the pressing strip (61) from sliding in the guide groove.

2. The UHPC prefabricated staircase structure according to claim 1, characterized in that: The invention also includes a support beam (2), wherein the support beam (2) is used to be fixed on the upper support platform, a slide groove (21) is provided on the support beam (2) along the length direction of the support beam (2), a slider (22) is slidably provided in the slide groove (21), a first fixing member (24) for preventing the slider (22) from sliding is provided on the support beam (2), a mounting frame (3) is slidably provided on the slider (22) along the horizontal direction, and the sliding direction of the mounting frame (3) is perpendicular to the length direction of the support beam (2), a second fixing member (32) for preventing the slider (22) from sliding is provided on the mounting frame (3), and the upper steel ladder beam (4) is provided on the mounting frame (3).

3. The UHPC prefabricated staircase structure according to claim 2, characterized in that: The mounting frame (3) is provided with a mounting groove (34) in a vertical direction, the upper steel ladder beam (4) is slidably arranged in the mounting groove (34) in the vertical direction, and the mounting frame (3) is provided with a lifting assembly (8) for lifting the upper steel ladder beam (4).

4. The UHPC assembled precast staircase structure according to claim 3, characterized in that: The jacking assembly (8) includes a jacking bolt (81) and a screw sleeve (82), wherein the jacking bolt (81) is rotatably arranged on the upper steel ladder beam (4), and the axial direction of the jacking bolt (81) is parallel to the sliding direction of the upper steel ladder beam (4), and the screw sleeve (82) is fixedly arranged in the installation groove (34), and the screw sleeve (82) is parallel to the axial direction of the jacking screw, and the jacking screw is passed through the screw sleeve (82) and is threadedly connected to the screw sleeve (82).

5. The UHPC assembled precast staircase structure according to claim 3, wherein: A grouting bag (36) is provided in the installation groove (34), and a grouting pipe (37) is fixedly provided on the installation frame (3), and the grouting pipe (37) is communicated with the grouting bag (36).

6. The UHPC prefabricated precast staircase structure according to claim 1, characterized in that: A rib is provided between the upper transverse section (712) and the longitudinal section (713).

7. The construction method of a UHPC assembled precast staircase structure according to claim 5, characterized in that, The following steps are involved: S1. Install the lower steel ladder beam (1) on the lower support platform and fix the support beam (2) on the upper support platform; S2, transporting a plurality of prefabricated unit steps (5) to the construction site, placing one of the prefabricated unit steps (5) in the ladder beam groove of the lower steel ladder beam (1), fixing the prefabricated unit step (5) by means of a fixing assembly (6), and then sequentially assembling and fixing the prefabricated unit steps (5) by means of a connecting assembly (7); S3. When the uppermost prefabricated unit step (5) is docked with the upper steel ladder beam (4), the upper steel ladder beam (4) is driven to move left and right by pushing the slider (22) to slide on the support beam (2), and the upper steel ladder beam (4) is driven to move forward and backward by driving the mounting frame (3) to slide on the slider (22). The slider (22) is prevented from sliding by the first fixing member (24), and the slider (22) and the mounting frame (3) are prevented from sliding relative to each other by the second fixing member (32). The horizontal position of the upper steel ladder beam (4) is adjusted, and the upper steel ladder beam (4) is driven to rise and fall by the jacking assembly (8). The vertical position of the upper steel ladder beam (4) is adjusted, so that the prefabricated unit step (5) is placed in the ladder beam groove of the upper steel ladder beam (4), and the uppermost prefabricated unit step (5) is fixed in the ladder beam groove of the upper steel ladder beam (4) by the fixing assembly (6); S4. Inject cement mortar into the grouting bag (36) through the grouting pipe (37). After the cement mortar solidifies, support the upper steel ladder beam (4) with the cement mortar to complete the construction of the prefabricated staircase.

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