Fabricated concrete stair capable of being installed in shear resistance mode and construction method of fabricated concrete stair

Abstract

The invention discloses an assembly type concrete stair capable of being installed in a shear resistance mode and a construction method thereof, belongs to the field of constructional engineering, and particularly relates to a preparation and construction installation method of prefabricated concrete stair sections. According to the prefabricated concrete stair section and the concrete stair beam, through cooperation of the steel pipes, the hollow holes, the connecting steel bars, the key grooves and the post-pouring concrete, after the post-pouring concrete reaches the design strength, the prefabricated concrete stair section and the concrete stair beam are fixedly connected, and the steel pipes and the post-pouring concrete jointly play a horizontal shear resisting role; compared with a conventional method, the shear strength of the mounting node can be remarkably improved, and the shear bearing capacity of the two connecting and mounting nodes at the upper end can meet the requirement under the condition that two connecting nodes at the lower end are omitted when a conventional prefabricated concrete stair section is mounted; compared with four connection points at the upper end and the lower end in the prior art, two connection points are reduced, the production and installation construction efficiency of the prefabricated concrete stair section can be improved, and the construction cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of construction engineering, and particularly relates to a preparation and construction installation method for precast concrete stair segments. Background Art

[0002] At present, in order to ensure the horizontal shear resistance of the installation joints of precast concrete stair segments under seismic loads, most of the installation joints of precast concrete stair segments adopt a four-point installation form, as shown in the national building standard design atlas "Precast Reinforced Concrete Plate Stairs" 15G367-1. However, there are no regulatory requirements for the shear resistance of the installation joints of precast concrete stair segments in engineering construction standards.

[0003] The specification of the invention patent application CN111267215A discloses a multi-purpose hole tool and application method for precast concrete stair segments. Only four multi-purpose hole tools are provided for the precast concrete stair segments, which are multi-functional, used for demolding during the preparation stage of the precast concrete stair segments, for hoisting during the transportation and installation of the precast concrete stair segments, for the bottom installation and fixation of the support system, significantly improving the safety and stability of the support system for installing precast concrete stairs, and also for the installation connection between the precast concrete stair segments and their supports, with convenient and reliable connection. Compared with the conventional method, two demolding hooks and four installation nails are saved. However, four installation joints are still required, with low efficiency, and the horizontal shear resistance of the installation joints under seismic loads is not improved.

[0004] The large number of installation joints of precast concrete stair segments will, to a certain extent, reduce the installation efficiency of precast concrete stair segments and drive up the construction cost. If the number of installation joints is reduced, the installation efficiency of precast concrete stair segments can be improved and the construction cost can be reduced. However, in order to ensure the safety of precast concrete stair segments under seismic loads, it is necessary to ensure that the horizontal shear resistance of the installation joints of precast concrete stair segments under seismic loads has sufficient redundancy.

[0005] Therefore, it is necessary to find a technical solution that can reduce the number of installation joints of precast concrete stair segments while improving the horizontal shear resistance of the installation joints of precast concrete stair segments under seismic loads. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: to provide a technical solution for the problems existing in the background art.

[0007] An assembled concrete stair with shear resistance installation, characterized in that: it includes a precast concrete stair segment and a concrete stair beam;

[0008] The precast concrete stair section includes a precast stair section, end beams and hollow holes; an end beam is integrally formed at the upper end of the precast stair section; hollow holes are provided on the end beam; the hollow holes penetrate the end beam from top to bottom, and the number of the hollow holes is two;

[0009] The concrete stair beam includes a stair beam, side ear projections of the beam and connecting steel bars; the stair beam is a reinforced concrete stair beam, and side ear projections of the beam are integrally formed on one side surface of the stair beam, and the position and length of the side ear projections of the beam are matched with the length of the end beam; connecting steel bars are provided on the side ear projections of the beam; the connecting steel bars are L-shaped, and the lower section of the connecting steel bars is arranged inside the side ear projections of the beam;

[0010] The end beam is arranged on the side ear projections of the beam, and a connecting kit is arranged between the end beam and the side ear projections of the beam; the upper section of the connecting steel bars protrudes through the top surface of the side ear projections of the beam and enters the inner cavity of the hollow hole through the connecting kit, and post-cast concrete is arranged in both the hollow hole and the connecting kit, and post-cast concrete is arranged on the contact surface between the end beam and the side ear projections of the beam;

[0011] The connecting kit includes a steel pipe and key grooves.

[0012] The steel pipe is arranged at the inner bottom of the hollow hole, and the bottom end of the steel pipe extends out of the bottom surface of the end beam; the key grooves are arranged at the top of the side ear projections of the beam, and the key grooves are grooves; the upper section of the connecting steel bars is vertically arranged at the central position of the key grooves, the number of the key grooves is two, and the positions of the key grooves are matched with the positions of the hollow holes.

[0013] The steel pipe is arranged on the side ear projections of the beam, the upper section of the connecting steel bars is arranged inside the steel pipe, the lower sections of both the steel pipe and the connecting steel bars are arranged in the side ear projections of the beam, and the center of the steel pipe corresponds to the center of the hollow hole; the key grooves are arranged on the bottom surface of the end beam, and the key grooves are grooves, and the positions of the key grooves are matched with the hollow holes.

[0014] A construction method for a shear-resistant assembled concrete stair is used to construct the shear-resistant assembled concrete stair as described above, and is characterized in that: it includes the following steps, and the following steps are carried out sequentially:

[0015] Step 1: Prepare the precast concrete stair section

[0016] Prepare the precast concrete stair section;

[0017] Step 2: Prepare the concrete stair beam

[0018] Prepare the concrete stair beam;

[0019] Step 3: Install the precast concrete stair section

[0020] After completing Step 1 and Step 2, carry out the connection and installation of the precast concrete stair section and the concrete stair beam:

[0021] S1: Pour post-cast concrete fully on the ear projections on the beam side;

[0022] S2: Install the precast stair section, place the bottom surface of the end beam at the upper end of the precast stair section on the post-cast concrete poured on the ear projections on the beam side, and insert the upper section of the connecting steel bars into the hollow holes correspondingly;

[0023] S3: Pour post-cast concrete from the top of the hollow holes and vibrate it until it is dense, and make the top surface of the post-cast concrete flush with the top surface of the end beam;

[0024] S4: Level the top surface of the post-cast concrete. After the post-cast concrete reaches the designed strength, the precast concrete stair section is fixedly connected to the concrete stair beam, and the installation construction of the precast concrete stair section is completed; through the combined connection action of steel pipes, connecting steel bars, key grooves and post-cast concrete, the precast concrete stair section and the concrete stair beam are connected to form an assembled concrete stair with shear resistance installation.

[0025] The steel pipe is arranged at the bottom inside the hollow hole, and the bottom end of the steel pipe extends out of the bottom surface of the end beam; the key groove is arranged at the top of the ear projection on the beam side, and the key groove is a groove; the upper section of the connecting steel bar is vertically arranged at the central position of the key groove, the number of the key grooves is two, and the positions of the key grooves are matched with the positions of the hollow holes; the method includes the following steps, and the following steps are carried out sequentially:

[0026] Step 1. Prepare the precast concrete stair section

[0027] Prepare the precast concrete stair section;

[0028] Step 2. Prepare the concrete stair beam

[0029] Prepare the concrete stair beam;

[0030] Step 3. Install the precast concrete stair section

[0031] After completing Step 1 and Step 2, carry out the connection and installation of the precast concrete stair section and the concrete stair beam:

[0032] S1: Pour post-cast concrete in the key grooves and on the ear projections on the beam side;

[0033] S2: Install the precast stair section, place the bottom surface of the end beam at the upper end of the precast stair section on the post-cast concrete poured in the key grooves and on the ear projections on the beam side, and insert the bottom end of the steel pipe into the post-cast concrete poured in the key grooves, and insert the upper section of the connecting steel bars into the hollow holes correspondingly;

[0034] S3: Fill the hollow holes and the steel pipes with post-cast concrete until they are full, and make the top surface of the post-cast concrete flush with the top surface of the end beam;

[0035] S4: Level the top surface of the cast-in-place concrete. After the cast-in-place concrete reaches the design strength, fixedly connect the precast concrete stair section with the concrete stair beam. The installation construction of the precast concrete stair section is completed, and an assembled concrete stair with shear resistance installation is obtained.

[0036] The steel pipe is arranged on the ear projection on the side of the beam. The upper section of the connecting steel bar is arranged inside the steel pipe. The lower sections of the steel pipe and the connecting steel bar are both arranged in the ear projection on the side of the beam, and the center of the steel pipe corresponds to the center of the hollow hole. The keyway is arranged on the bottom surface of the end beam, and the keyway is a groove, and the position of the keyway cooperates with the hollow hole. The method includes the following steps, and the following steps are carried out sequentially:

[0037] Step 1: Prepare the precast concrete stair section

[0038] Prepare the precast concrete stair section;

[0039] Step 2: Prepare the concrete stair beam

[0040] Prepare the concrete stair beam;

[0041] Step 3: Install the precast concrete stair section

[0042] After completing Step 1 and Step 2, carry out the connection and installation of the precast concrete stair section and the concrete stair beam:

[0043] S1: Lay the cast-in-place concrete on the ear projection on the side of the beam;

[0044] S2: Install the precast stair section, place the bottom surface of the end beam at the upper end of the precast stair section on the cast-in-place concrete laid on the ear projection on the side of the beam, insert the top end of the steel pipe into the keyway, and correspondingly insert the upper section of the connecting steel bar into the hollow hole;

[0045] S3: Fill the keyway, the upper section inside the steel pipe and the hollow hole with cast-in-place concrete, and make the top surface of the cast-in-place concrete flush with the top surface of the end beam;

[0046] S4: Level the top surface of the cast-in-place concrete. After the cast-in-place concrete reaches the design strength, fixedly connect the precast concrete stair section with the concrete stair beam. The installation construction of the precast concrete stair section is completed, and an assembled concrete stair with shear resistance installation is obtained.

[0047] Through the above design solution, a precast concrete staircase with shear-resistant installation and a construction method are obtained. Through the cooperation of steel pipes, hollow holes, connecting steel bars and key grooves with the post-cast concrete, after the post-cast concrete reaches the design strength, the precast concrete staircase section and the concrete staircase beam form a fixed connection. The steel pipe and the post-cast concrete jointly play a horizontal shear-resistant role. Compared with the traditional situation without steel pipes inserted into the key grooves, the shear-resistant performance of the horizontal section at the position of the top surface of the ear on the beam side at the upper installation node of the precast concrete staircase section is significantly improved; only two connection points are set at the upper end of the precast concrete staircase section, which is two less than the total of four connection points at the upper and lower ends in the traditional case. It can improve the production and installation construction efficiency of the precast concrete staircase section and reduce the construction cost while meeting the shear-resistant performance of the installation node of the precast concrete staircase section. The improvement of this method for the precast concrete staircase section and its installation construction is easy to complete and is suitable for application and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a top plan view schematic diagram of the upper end part of the precast concrete staircase section in the present invention;

[0049] Figure 2 It is a sectional schematic diagram of the upper end part of the precast concrete staircase section in the present invention Figure 1 ;

[0050] Figure 3 It is a top plan view schematic diagram of the concrete staircase beam in the present invention Figure 1 ;

[0051] Figure 4 It is a sectional schematic diagram of the concrete staircase beam in the present invention Figure 1 ;

[0052] Figure 5 It is a plan view schematic diagram after the installation of the upper end part of the precast concrete staircase section in the present invention is completed;

[0053] Figure 6 It is a sectional schematic diagram of the installation node after the installation of the upper end part of the precast concrete staircase section in the present invention is completed Figure 1 .

[0054] Figure 7 It is a bottom plan view schematic diagram of the upper end part of the precast concrete staircase section in the present invention;

[0055] Figure 8 It is a sectional schematic diagram of the upper end part of the precast concrete staircase section in the present invention Figure 2 ;

[0056] Figure 9 It is a top plan view schematic diagram of the concrete staircase beam in the present invention Figure 2 ;

[0057] Figure 10 Schematic cross-section of the concrete stair beam in the present invention Figure 2 ;

[0058] Figure 11 Schematic cross-section of the installation joint after the upper end of the precast concrete stair section is installed in the present invention Figure 2 。

[0059] In the figure, 1 - precast stair section, 2 - end beam, 3 - hollow hole, 4 - steel pipe, 5 - stair beam, 6 - ear on the side of the beam, 7 - keyway, 8 - connecting steel bar, 9 - post-cast concrete. Specific embodiments

[0060] The present application will be further described in conjunction with the accompanying drawings:

[0061] Embodiment 1

[0062] An assembled concrete stair with shear-resistant installation, characterized in that it includes a precast concrete stair section and a concrete stair beam;

[0063] The precast concrete stair section includes a precast stair section 1, an end beam 2 and a hollow hole 3; an end beam 2 is integrally formed at the upper end of the precast stair section 1; a hollow hole 3 is provided on the end beam 2; the hollow hole 3 runs through the end beam 2 from top to bottom, and the number of the hollow holes 3 is two;

[0064] The concrete stair beam includes a stair beam 5, an ear on the side of the beam 6 and a connecting steel bar 8; the stair beam 5 is a reinforced concrete stair beam, and an ear on the side of the beam 6 is integrally formed on one side of the stair beam 5, and the position and length of the ear on the side of the beam 6 are matched with the length of the end beam 2; a connecting steel bar 8 is provided on the ear on the side of the beam 6; the connecting steel bar 8 is L-shaped and is respectively an upper section and a lower section, and the lower section of the connecting steel bar 8 is arranged inside the ear on the side of the beam 6;

[0065] The end beam 2 is arranged on the ear on the side of the beam 6, and a connecting kit is arranged between the end beam 2 and the ear on the side of the beam 6; the upper section of the connecting steel bar 8 protrudes from the top surface of the ear on the side of the beam 6 and passes through the connecting kit into the inner cavity of the hollow hole 3, and post-cast concrete 9 is arranged in both the hollow hole 3 and the connecting kit, and post-cast concrete 9 is arranged on the contact surface between the end beam 2 and the ear on the side of the beam 6;

[0066] The connecting kit includes a steel pipe 4 and a keyway 7.

[0067] A construction method of an assembled concrete stair with shear-resistant installation, used for constructing the above-mentioned assembled concrete stair with shear-resistant installation, characterized in that it includes the following steps, and the following steps are carried out in sequence:

[0068] Step 1. Prepare the precast concrete stair section

[0069] Fabricate the precast concrete stair section;

[0070] Step Two: Fabricate the concrete stair beam

[0071] Fabricate the concrete stair beam;

[0072] Step Three: Install the precast concrete stair section

[0073] After completing Step One and Step Two, conduct the connection and installation between the precast concrete stair section and the concrete stair beam:

[0074] S1: Fully spread the post-cast concrete 9 on the ear 6 on the side of the beam;

[0075] S2: Install the precast stair section 1, place the bottom surface of the end beam 2 at the upper end of the precast stair section 1 on the post-cast concrete 9 laid on the ear 6 on the side of the beam, and correspondingly insert the upper section of the connecting steel bar 8 into the hollow hole 3;

[0076] S3: Pour the post-cast concrete 9 from the top of the hollow hole 3 and vibrate it until it is dense, and the top surface of the post-cast concrete 9 is flush with the top surface of the end beam 2;

[0077] S4: Level the top surface of the post-cast concrete 9. After the post-cast concrete 9 reaches the designed strength, the precast concrete stair section and the concrete stair beam are fixedly connected, and the installation construction of the precast concrete stair section is completed; through the combined connection actions of the steel pipe 4, the connecting steel bar 8, the keyway 7 and the post-cast concrete 9, the precast concrete stair section and the concrete stair beam are connected to form an assembled concrete stair with shear-resistant installation.

[0078] Example Two

[0079] An assembled concrete stair with shear-resistant installation, characterized in that it includes a precast concrete stair section and a concrete stair beam;

[0080] The precast concrete stair section includes a precast stair section 1, an end beam 2 and a hollow hole 3; the upper end of the precast stair section 1 is integrally formed with an end beam 2; the end beam 2 is provided with a hollow hole 3; the hollow hole 3 runs through the end beam 2 from top to bottom, and the number of the hollow holes 3 is two;

[0081] The concrete stair beam includes a stair beam 5, an ear 6 on the side of the beam and a connecting steel bar 8; the stair beam 5 is a reinforced concrete stair beam, and an ear 6 on the side of the beam is integrally formed on one side of the stair beam 5, and the position and length of the ear 6 on the side of the beam are matched with the length of the end beam 2; the ear 6 on the side of the beam is provided with a connecting steel bar 8; the connecting steel bar 8 is L-shaped, and the lower section of the connecting steel bar 8 is arranged inside the ear 6 on the side of the beam;

[0082] The end beam 2 is arranged on the beam side lug 6, and a connecting kit is arranged between the end beam 2 and the beam side lug 6; the upper section of the connecting steel bar 8 protrudes through the top surface of the beam side lug 6 and enters the inner cavity of the hollow hole 3 through the connecting kit, and post-cast concrete 9 is arranged in both the hollow hole 3 and the connecting kit, and post-cast concrete 9 is arranged on the contact surface between the end beam 2 and the beam side lug 6;

[0083] The connecting kit includes a steel pipe 4 and a keyway 7; the steel pipe 4 is arranged at the inner bottom of the hollow hole 3, and the bottom end of the steel pipe 4 extends out of the bottom surface of the end beam 2; the keyway 7 is arranged at the top of the beam side lug 6, and the keyway 7 is a groove; the upper section of the connecting steel bar 8 is vertically arranged at the center position of the keyway 7, the number of the keyways 7 is two, and the positions of the keyways 7 are matched with the positions of the hollow holes 3.

[0084] A construction method for a precast concrete staircase with shear resistance installation, which is used to construct the precast concrete staircase with shear resistance installation as described above, is characterized in that: it includes the following steps, and the following steps are carried out in sequence:

[0085] Step 1: Prepare the precast concrete staircase section

[0086] Prepare the precast concrete staircase section;

[0087] Step 2: Prepare the concrete staircase beam

[0088] Prepare the concrete staircase beam;

[0089] Step 3: Install the precast concrete staircase section

[0090] After completing Step 1 and Step 2, carry out the connection and installation of the precast concrete staircase section and the concrete staircase beam:

[0091] S1: Lay post-cast concrete 9 in the keyway 7 and on the beam side lug 6;

[0092] S2: Install the precast staircase section 1, place the bottom surface of the end beam 2 at the upper end of the precast staircase section 1 on the post-cast concrete 9 laid in the keyway 7 and on the beam side lug 6, wherein the bottom end of the steel pipe 4 is inserted into the post-cast concrete 9 laid in the keyway 7, and the upper section of the connecting steel bar 8 is correspondingly inserted into the hollow hole 3;

[0093] S3: Fill the hollow hole 3 and the steel pipe 4 with post-cast concrete 9 until the top surface of the post-cast concrete 9 is flush with the top surface of the end beam 2;

[0094] S4: Level the top surface of the post-cast concrete 9. After the post-cast concrete 9 reaches the designed strength, the precast concrete staircase section and the concrete staircase beam are fixedly connected, and the installation construction of the precast concrete staircase section is completed, obtaining a precast concrete staircase with shear resistance installation.

[0095] Example 3

[0096] An assembled concrete staircase with shear-resistant installation, characterized in that it comprises a precast concrete staircase section and a concrete staircase beam;

[0097] The precast concrete staircase section includes a precast staircase section 1, an end beam 2 and hollow holes 3; an end beam 2 is integrally formed at the upper end of the precast staircase section 1; hollow holes 3 are provided on the end beam 2; the hollow holes 3 penetrate the end beam 2 from top to bottom, and the number of the hollow holes 3 is two;

[0098] The concrete staircase beam includes a staircase beam 5, a beam-side ear 6 and connecting steel bars 8; the staircase beam 5 is a reinforced concrete staircase beam, and a beam-side ear 6 is integrally formed on one side of the staircase beam 5, and the position and length of the beam-side ear 6 are matched with the length of the end beam 2; connecting steel bars 8 are provided on the beam-side ear 6; the connecting steel bars 8 are L-shaped, and the lower section of the connecting steel bars 8 is arranged inside the beam-side ear 6;

[0099] The end beam 2 is arranged on the beam-side ear 6, and a connecting kit is arranged between the end beam 2 and the beam-side ear 6; the upper section of the connecting steel bar 8 protrudes from the top surface of the beam-side ear 6 and passes through the connecting kit into the inner cavity of the hollow hole 3, and post-cast concrete 9 is arranged in both the hollow hole 3 and the connecting kit, and post-cast concrete 9 is arranged on the contact surface between the end beam 2 and the beam-side ear 6;

[0100] The connecting kit includes a steel pipe 4 and a keyway 7; the steel pipe 4 is arranged on the beam-side ear 6, the upper section of the connecting steel bar 8 is arranged inside the steel pipe 4, both the steel pipe 4 and the lower section of the connecting steel bar 8 are arranged in the beam-side ear 6, and the center of the steel pipe 4 corresponds to the center of the hollow hole 3; the keyway 7 is arranged on the bottom surface of the end beam 2, and the keyway 7 is a groove, and the position of the keyway 7 is matched with the hollow hole 3.

[0101] A construction method for an assembled concrete staircase with shear-resistant installation, used for constructing the above-mentioned assembled concrete staircase with shear-resistant installation, characterized in that it includes the following steps, and the following steps are carried out in sequence:

[0102] Step 1: Prepare the precast concrete staircase section

[0103] Prepare the precast concrete staircase section;

[0104] Step 2: Prepare the concrete staircase beam

[0105] Prepare the concrete staircase beam;

[0106] Step 3: Install the precast concrete staircase section

[0107] After completing Step 1 and Step 2, the connection and installation of the precast concrete stair section and the concrete stair beam are carried out:

[0108] S1: Pour the post-cast concrete 9 on the ear 6 on the side of the beam;

[0109] S2: Install the precast stair section 1, place the bottom surface of the end beam 2 at the upper end of the precast stair section 1 on the post-cast concrete 9 poured on the ear 6 on the side of the beam, insert the top end of the steel pipe 4 into the keyway 7, and correspondingly insert the upper section of the connecting steel bar 8 into the hollow hole 3;

[0110] S3: Fill the keyway 7, the upper section inside the steel pipe 4 and the hollow hole 3 with the post-cast concrete 9 until it is solid, and the top surface of the post-cast concrete 9 is flush with the top surface of the end beam 2;

[0111] S4: Level the top surface of the post-cast concrete 9. After the post-cast concrete 9 reaches the design strength, the precast concrete stair section is fixedly connected to the concrete stair beam, and the installation construction of the precast concrete stair section is completed, obtaining an assembled concrete stair with shear-resistant installation.

[0112] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be covered by the protection scope of the present invention. At the same time, the content not detailedly described in this specification belongs to the prior art well-known to those skilled in the art.

Claims

1. A prefabricated concrete staircase with shear resistance installation, characterized by: Includes precast concrete stair flights and concrete stair beams; The prefabricated concrete staircase comprises a prefabricated staircase (1), an end beam (2) and a hollow hole (3); the upper end of the prefabricated staircase (1) is integrally formed with the end beam (2); the end beam (2) is provided with a hollow hole (3); the hollow hole (3) penetrates the end beam (2) from top to bottom, and the number of the hollow holes (3) is two; The concrete staircase beam comprises a staircase beam (5), a beam side lug (6) and a connecting steel bar (8); the staircase beam (5) is a reinforced concrete staircase beam, and a beam side lug (6) is integrally formed on one side of the staircase beam (5), and the position and length of the beam side lug (6) are matched with the length of the end beam (2); a connecting steel bar (8) is arranged on the beam side lug (6); the connecting steel bar (8) is L-shaped, and the lower section of the connecting steel bar (8) is arranged inside the beam side lug (6); The end beam (2) is arranged on the beam side lug (6), and a connection kit is arranged between the end beam (2) and the beam side lug (6); the upper section of the connecting steel bar (8) protrudes from the top surface of the beam side lug (6) and passes through the connection kit into the inner cavity of the hollow hole (3), and post-cast concrete (9) is arranged in the hollow hole (3) and the connection kit, and post-cast concrete (9) is arranged on the contact surface between the end beam (2) and the beam side lug (6); The connection kit comprises a steel pipe (4) and a keyway (7).

2. The shear-resistant assembled concrete staircase according to claim 1 is characterized by: The steel pipe (4) is arranged at the bottom of the hollow hole (3), and the bottom end of the steel pipe (4) extends out of the bottom surface of the end beam (2); the keyway (7) is arranged at the top of the beam side ear (6), and the keyway (7) is a groove; the upper section of the connecting steel bar (8) is vertically arranged at the center of the keyway (7), the number of the keyways (7) is two, and the position of the keyway (7) matches the position of the hollow hole (3).

3. The shear-resistant assembled concrete staircase according to claim 1 is characterized by: The steel pipe (4) is arranged on the beam side ear (6), the upper section of the connecting steel bar (8) is arranged in the steel pipe (4), the lower sections of the steel pipe (4) and the connecting steel bar (8) are both arranged in the beam side ear (6), and the center of the steel pipe (4) corresponds to the center of the hollow hole (3); the keyway (7) is arranged on the bottom surface of the end beam (2), and the keyway (7) is a groove, and the position of the keyway (7) matches the hollow hole (3).

4. A method for constructing a shear-resistant assembled concrete staircase, used to construct the shear-resistant assembled concrete staircase according to claim 1, characterized in that: The process includes the following steps, which are performed in sequence: Step 1: Prepare precast concrete staircase preparing the precast concrete staircase; Step 2: Prepare concrete stair beams preparing the concrete staircase beam; Step 3: Precast concrete staircase installation After completing step 1 and step 2, proceed with the installation of the connection between the precast concrete staircase sections and the concrete staircase beams: S1: Fully spread the post-cast concrete (9) on the beam side ears (6); S2: installing the prefabricated staircase section (1), placing the bottom surface of the end beam (2) at the upper end of the prefabricated staircase section (1) on the post-cast concrete (9) laid on the beam side ear (6), and inserting the upper section of the connecting steel bar (8) into the hollow hole (3); S3: pouring post-cast concrete (9) from the top of the hollow hole (3) and vibrating and compacting it, so that the top surface of the post-cast concrete (9) is flush with the top surface of the end beam (2); S4: Smoothing the top surface of the post-cast concrete (9), after the post-cast concrete (9) reaches the designed strength, the precast concrete staircase section is fixedly connected to the concrete staircase beam, and the installation construction of the precast concrete staircase section is completed; through the joint connection of the steel pipe (4), the connecting steel bar (8), the keyway (7) and the post-cast concrete (9), the precast concrete staircase section and the concrete staircase beam are connected to form a shear-resistant assembled concrete staircase.

5. A method for constructing a shear-resistant assembled concrete staircase according to claim 4, characterized in that: The steel pipe (4) is arranged at the bottom of the hollow hole (3), and the bottom end of the steel pipe (4) extends out of the bottom surface of the end beam (2); the keyway (7) is arranged at the top of the beam side ear (6), and the keyway (7) is a groove; the upper section of the connecting steel bar (8) is vertically arranged at the center of the keyway (7), the number of the keyways (7) is two, and the position of the keyway (7) matches the position of the hollow hole (3); the method comprises the following steps, And the following steps are performed in sequence: Step 1: Prepare precast concrete staircase preparing the precast concrete staircase; Step 2: Prepare concrete stair beams preparing the concrete staircase beam; Step 3: Precast concrete staircase installation After completing steps 1 and 2, proceed with the installation of the precast concrete staircase sections and concrete staircase beams: S1: Laying post-cast concrete (9) in the keyway (7) and on the beam side ears (6); S2: installing the prefabricated staircase section (1), placing the bottom surface of the end beam (2) at the upper end of the prefabricated staircase section (1) on the post-cast concrete (9) laid in the keyway (7) and on the beam side ears (6), wherein the bottom end of the steel pipe (4) is inserted into the post-cast concrete (9) laid in the keyway (7), and the upper section of the connecting steel bar (8) is correspondingly inserted into the hollow hole (3); S3: Fill the hollow hole (3) and the steel pipe (4) with post-cast concrete (9), and the top surface of the post-cast concrete (9) is flush with the top surface of the end beam (2); S4: Smoothing the top surface of the post-cast concrete (9), after the post-cast concrete (9) reaches the designed strength, the precast concrete staircase section is fixedly connected to the concrete staircase beam, and the installation construction of the precast concrete staircase section is completed to obtain a shear-resistant assembled concrete staircase.

6. A method for constructing a shear-resistant assembled concrete staircase according to claim 4, characterized in that: The steel pipe (4) is arranged on the beam side ear (6), the upper section of the connecting steel bar (8) is arranged in the steel pipe (4), the lower sections of the steel pipe (4) and the connecting steel bar (8) are both arranged in the beam side ear (6), and the center of the steel pipe (4) corresponds to the center of the hollow hole (3); the keyway (7) is arranged on the bottom surface of the end beam (2), and the keyway (7) is a groove, and the position of the keyway (7) matches the hollow hole (3); the method comprises the following steps, And the following steps are performed in sequence: Step 1: Prepare precast concrete staircase preparing the precast concrete staircase; Step 2: Prepare concrete stair beams preparing the concrete staircase beam; Step 3: Precast concrete staircase installation After completing steps 1 and 2, proceed with the installation of the precast concrete staircase sections and concrete staircase beams: S1: Laying post-cast concrete (9) on the beam side ears (6); S2: Install the prefabricated staircase section (1), place the bottom surface of the end beam (2) at the upper end of the prefabricated staircase section (1) on the post-cast concrete (9) laid on the beam side ear (6), insert the top end of the steel pipe (4) into the keyway (7), and insert the upper section of the connecting steel bar (8) into the corresponding hollow hole (3); S3: Fill the keyway (7), the upper section inside the steel pipe (4) and the hollow hole (3) with post-cast concrete (9), and the top surface of the post-cast concrete (9) is flush with the top surface of the end beam (2); S4: Smoothing the top surface of the post-cast concrete (9), after the post-cast concrete (9) reaches the designed strength, the precast concrete staircase section is fixedly connected to the concrete staircase beam, and the installation construction of the precast concrete staircase section is completed to obtain a shear-resistant assembled concrete staircase.

Images