CN108947448B

CN108947448B - Flexible hole filling material for fabricated stairway and preparation method thereof

Info

Publication number: CN108947448B
Application number: CN201810805497.2A
Authority: CN
Inventors: 张守峰; 姚远; 刘克; 朱炳寅
Original assignee: China Architecture Design and Research Group Co Ltd
Current assignee: China Architecture Design and Research Group Co Ltd
Priority date: 2018-07-20
Filing date: 2018-07-20
Publication date: 2021-10-15
Anticipated expiration: 2038-07-20
Also published as: CN108947448A

Abstract

The invention discloses a flexible hole filling material for an assembled stair and a preparation method thereof, the assembled stair and an installation method thereof, belongs to the technical field of assembled buildings, and solves the problems that hole filling materials at two ends of a stair section plate of the assembled stair in the prior art are high in strength and cannot generate large deformation. The raw materials of the material comprise the following components in percentage by weight: 6-12% of anionic emulsion, 0.2-0.4% of defoaming agent, 30-50% of cementing material, 40-60% of graded sand, 0.1-0.2% of water reducing agent, 0.1-0.2% of setting time regulator, 0.1-0.2% of anti-settling regulator, 5-10% of steel fiber and the balance of water. The assembled stair comprises a plurality of stair section plates which are connected up and down, a stair beam and a bracket are arranged at the joint of two adjacent stair section plates, and two ends of each stair section plate are fixedly connected with the bracket through connecting devices; the connecting device comprises a bolt, an elastic pouring piece sleeved on the upper part of the bolt and a nut fixedly connected with the upper end of the bolt, wherein the elastic pouring piece is dumbbell-shaped and is made of the materials.

Description

Flexible hole filling material for fabricated stairway and preparation method thereof

Technical Field

The invention relates to an assembly type building, in particular to a flexible hole filling material for an assembly type stair and a preparation method thereof, and the assembly type stair and an installation method thereof.

Background

The assembled stair is an assembled part formed by vertically connecting a plurality of stair section plates, has the characteristics of high construction speed, convenience in operation, high appearance quality and the like, and can meet the requirements of green buildings on high efficiency, high quality, low cost and low energy consumption.

In the prior art, a common connection mode of the fabricated stairway is that circular holes or square holes are reserved at two ends of a stair section plate respectively and are filled with common grouting materials (the strength is generally not less than 80 MPa). Because both ends of the stair section plate are filled with high-strength grouting material, large deformation can not be generated basically, and under the action of horizontal force (such as earthquake or wind load), when the main body structure generates lateral deformation, the stair can generate a diagonal bracing effect, and the main body structure of the building (particularly beam columns at the stairwell) is adversely affected. In addition, in case the bolt of connecting the bench board breaks under the effect of shear force, the bench board can lose the restraint, takes place to fall, has great potential safety hazard, can't play the effect of stair as sparse "safety island".

In the second connection mode, as shown in fig. 1, round holes or square holes are reserved at two ends of the bench plate, one end of the bench plate is filled with common grouting material, and the other end of the bench plate is a cavity. Although the inclined strut effect of the staircase along the staircase running direction can be eliminated, under the action of seismic force (inertia force) vertical to the staircase running direction, the bolt in the lower end cavity is easy to shear and damage under the action of earthquake impact force, and the seismic force is only borne by the bolt 1 at the upper end, as shown in figure 1, the eccentric action of the inertia force of the staircase section plate on the bolt at the upper end can generate larger torsional moment, so that the bolt 1 is dangerous to break, and the safety hazard is generated.

Disclosure of Invention

In view of the above analysis, the present invention aims to provide a flexible hole-filling material for an assembled stair, a preparation method thereof, an assembled stair and an installation method thereof, and solves the problems that the hole-filling material at two ends of a stair flight plate of the assembled stair in the prior art has high strength and cannot generate large deformation.

The purpose of the invention is mainly realized by the following technical scheme:

on one hand, the invention provides a flexible hole filling material for an assembled stair, which comprises the following raw materials in percentage by weight: 6-12% of anionic emulsion, 0.2-0.4% of defoaming agent, 30-50% of cementing material, 40-60% of graded sand, 0.1-0.2% of water reducing agent, 0.1-0.2% of setting time regulator, 0.1-0.2% of anti-settling regulator, 5-10% of steel fiber and the balance of water.

In one possible design, the anionic emulsion is one or at least two of acrylic emulsion, styrene and acrylate copolymer emulsion and silicone resin emulsion mixed in any proportion.

In one possible design, the cementing material is one or at least two of portland cement, aluminate cement, semi-hydrated gypsum and anhydrous gypsum mixed in any proportion.

In one possible design, the defoaming agent is one or at least two of vegetable oil, polyether defoaming agent, modified fatty acid and alkoxy compound defoaming agent, special wax and mineral oil defoaming agent which are mixed in any proportion; the water reducing agent is one or two of melamine water reducing agent and polycarboxylate water reducing agent which are mixed in any proportion; the setting time regulator is one or the mixture of at least two of citric acid, tartaric acid, lithium carbonate and lithium sulfate in any proportion; the anti-settling regulator is one or a mixture of hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether in any proportion.

In one possible design, the graded sand is one or at least two of machine sand, river sand and tailing sand mixed in any proportion; the diameter of the steel fiber is 0.1-0.5 mm, and the length is 10-15 mm.

On the other hand, the invention also provides a preparation method of the flexible hole filling material, which is used for preparing the flexible hole filling material and comprises the following steps:

step 1: mixing the anionic emulsion, the defoaming agent and water, and uniformly stirring to obtain a polymer matrix solution;

step 2: mixing the cementing material, the graded sand, the water reducing agent, the setting time regulator, the anti-settling regulator and the steel fiber, and uniformly stirring to obtain powder;

and step 3: and adding the powder into the polymer matrix solution, and stirring to obtain flowable slurry to obtain the flexible hole-filling material.

In a possible design, in the step 3, the powder is added into the polymer matrix solution at a speed of 80-120 g/s, and the stirring time is 4-6 min.

In another aspect, the invention further provides an assembled stair, which comprises a plurality of ladder section plates which are connected up and down, wherein a ladder beam and a bracket are arranged at the joint of two adjacent ladder section plates, the lower end surface of the ladder beam is connected with the fixed beam at the upper end surface of the bracket, the bracket protrudes out of the side surface of the ladder beam, and two ends of the ladder section plates are respectively lapped on the part of the adjacent bracket, which protrudes out of the ladder beam, and are fixedly connected with the bracket through a connecting device; the connecting device comprises a bolt, an elastic pouring piece sleeved on the upper part of the bolt and a nut fixedly connected with the upper end of the bolt, the lower part of the bolt is positioned in the bracket, and the upper part of the bolt, the elastic pouring piece and the nut are positioned in the bench board; the elastic pouring piece is in a dumbbell shape and is made of the flexible pouring hole material.

In one possible design, the elastic infusion member includes a middle portion and end portions at both ends of the middle portion, the middle portion is in the shape of a right cylinder, and the diameter of the end portions is gradually increased in a direction away from the middle portion.

In another aspect, the present invention further provides a method for installing an assembled staircase, the method comprising the following steps:

step 1: pouring the ladder beam and the bracket, and fixing the lower part of the bolt in the bracket when pouring the bracket;

step 2: after the ladder beam and the bracket reach the designed strength, hoisting the ladder section plate to a target position, and inserting the upper part of the bolt into a pouring hole of the ladder section plate;

and step 3: injecting an elastic filling material into the filling hole, and forming an elastic filling piece after the elastic filling material is shaped;

and 4, step 4: screwing a nut at the upper end of the bolt, and filling the filling hole;

and 5: and (5) repeating the steps 2 to 4 until the connection of all the stair section plates and the bracket is completed, and completing the installation of the assembled stair.

Compared with the prior art, the invention has the following beneficial effects:

a) the flexible hole filling material for the fabricated stairway provided by the invention adopts industrial-grade medicines and industrial water as raw materials, and can be produced at normal temperature and normal pressure. The flexible hole-filling material can be used for anchoring connection of prefabricated concrete slab stair end nodes in frame cylinder structures of assembled frame structures and frame shear wall structures, is added with water and stirred uniformly to form fluid slurry, and can be used for pouring.

b) The flexible hole-filling material provided by the invention is adopted to replace the traditional common grouting material, so that the mechanical model of the connection between the stair section plate and the bracket of the assembled stair is between the fixed hinged support and the sliding hinged support, and the flexible hole-filling material has certain toughness and deformability due to the lower strength than the common grouting material, and can deform without losing the bearing capacity under the reciprocating extrusion action, thereby improving the bearing capacity of the whole assembled stair. Meanwhile, when an earthquake occurs, the anti-seismic stair can effectively release the effect of the inclined strut on the stair section plate under the action of horizontal force, weaken the adverse effect of the stair on the main body structure, effectively resist the seismic force perpendicular to the stair running direction, and completely meet the defense level of 'small earthquake damage prevention, medium earthquake repairable and large earthquake fall prevention' in China.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.

FIG. 1 is a force analysis diagram of a second attachment mode of a prefabricated staircase according to the prior art;

FIG. 2 is a schematic view of the assembled stair attachment apparatus of the present invention;

FIG. 3 is a schematic view of one form of the resilient filling of the fabricated stair attachment device of the present invention;

FIG. 4 is a schematic view of another form of the resilient infusion member of the fabricated stair attachment device of the present invention;

FIG. 5 is a schematic view of the connection of the stair flight panels to the lower corbels of the fabricated stairway according to the present invention;

FIG. 6 is a schematic view of the attachment of the flight panels to the upper corbel of the fabricated stairway according to the present invention;

FIG. 7 is a schematic structural view of the fabricated stairway according to the present invention;

fig. 8 is a force analysis diagram of a flight plate in the fabricated stairway according to the present invention.

Reference numerals:

1-a bolt; 2-elastic pouring; 201-middle part; 202-end; 3-a nut; 4-a bench plate; 5-ladder beam; 6-leveling layer; 7-bracket.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.

On one hand, the invention provides a flexible hole filling material for an assembled stair, which comprises the following raw materials in percentage by weight: 6-12% of modified anionic emulsion, 0.2-0.4% of defoaming agent, 30-50% of cementing material, 40-60% of graded sand, 0.1-0.2% of water reducing agent, 0.1-0.2% of setting time regulator, 0.1-0.2% of anti-settling regulator, 5-10% of steel fiber and the balance of water.

Compared with the prior art, the flexible hole filling material for the fabricated stairway provided by the invention adopts industrial-grade medicines and industrial water as raw materials, and can be produced at normal temperature and normal pressure. The flexible hole-filling material can be used for anchoring connection of prefabricated concrete slab stair end nodes in frame cylinder structures of assembled frame structures and frame shear wall structures, is added with water and stirred uniformly to form fluid slurry, and can be used for pouring.

In addition, adopt above-mentioned flexible hole-grouting material to replace traditional ordinary grout material for the mechanical model of being connected between the bench board of assembled stair and the bracket is between fixed hinged support and slip hinged support, because the intensity of flexible hole-grouting material is low for ordinary grout material, has certain toughness and deformability, under reciprocal squeezing action, flexible hole-grouting material can take place to warp and not lose the bearing capacity, thereby can improve the whole power that can bear of assembled stair. Meanwhile, when an earthquake occurs, the anti-seismic stair can effectively release the effect of the inclined strut on the stair section plate under the action of horizontal force, weaken the adverse effect of the stair on the main body structure, effectively resist the seismic force perpendicular to the stair running direction, and completely meet the defense level of 'small earthquake damage prevention, medium earthquake repairable and large earthquake fall prevention' in China.

Illustratively, the modified anionic emulsion is one or at least two of acrylic emulsion, styrene and acrylate copolymer emulsion and silicone resin emulsion mixed in any proportion.

The modified defoaming agent is one or a mixture of at least two of vegetable oil, polyether defoaming agent, modified fatty acid and alkoxy compound defoaming agent, special wax and mineral oil defoaming agent in any proportion.

The cementing material is one or the mixture of at least two of Portland cement, aluminate cement, semi-hydrated gypsum and anhydrous gypsum in any proportion.

The graded sand is one or mixture of at least two of machine-made sand, river sand and tailing sand in any proportion.

The water reducing agent is one or two of melamine water reducing agent and polycarboxylate water reducing agent which are mixed in any proportion.

The setting time regulator is one or at least two of citric acid, tartaric acid, lithium carbonate and lithium sulfate mixed in any proportion.

The anti-settling regulator is low viscosity modified cellulose ether, such as hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether, or their mixture at any ratio.

The steel fiber is 0.1-0.5 mm in diameter and 10-15 mm in length.

All of the above raw materials are industrial raw materials.

The water is urban domestic water or industrial water.

On the other hand, the invention also provides a preparation method of the flexible hole filling material for the fabricated stairway, which is used for preparing the flexible hole filling material for the fabricated stairway, and the preparation method comprises the following steps:

step 1: mixing the modified anionic emulsion, the defoaming agent and water, and uniformly stirring to obtain a polymer matrix solution;

step 2: mixing the cementing material, the graded sand, the water reducing agent, the setting time regulator, the anti-settling regulator and the steel fiber, and uniformly stirring by using a powder stirrer to obtain powder;

and step 3: slowly adding the powder into the polymer matrix solution at a speed of 80-120 g/s, and stirring for 4-6 min by using a high-speed dispersion machine to obtain flowable slurry, thereby preparing the flexible hole-filling material for the fabricated stairway.

The raw material compositions of the flexible hole-filling materials of the following examples 1 to 6 are shown in table 1, and the corresponding performance tests of the examples are shown in table 2.

Table 1 raw material composition of flexible hole-filling material of examples 1 to 6

Table 2 results of performance test of the flexible hole-filling materials of examples 1 to 6

Performance of	Flexible hole filling material	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6
								Degree of fluidity	Initial value	270	265	260	265	270	260
(mm)	Value of 30min	255	250	260	265	250	250
								Strength (28d)	Anti-folding	3.6	3.5	3.6	3.8	3.5	3.5
(MPA)	Pressure-resistant	9.3	9.6	9.5	9.9	9.8	9.5
								Value of deformation	(mm)	10.4	10.2	10.1	10.1	10.1	10.2

Tests show that the initial fluidity of the flexible hole filling material is 260-270 mm, the fluidity for 30min is 250-265 mm, the breaking strength for 28 days is 3.5-3.8 MPa, the compressive strength is 9.3-9.9 MPa, and the deformation value is 10.1-10.4 mm.

In another aspect, the present invention provides an assembled staircase, as shown in fig. 2 to 7, which comprises a plurality of ladder section boards 4 connected up and down, a ladder beam 5 and a bracket 7 are arranged at the joint of two adjacent ladder section boards 4, the lower end surface of the ladder beam 5 is connected with the upper end surface fixing beam of the bracket 7, the bracket 7 protrudes out of the side surface of the ladder beam 5, and the two ends of the ladder section boards 4 are respectively lapped on the part of the bracket 7 adjacent to the ladder beam and fixedly connected with the bracket 7 through a connecting device; the lower part of the bolt 1 is positioned in the bracket 7, and the upper part of the bolt 1, the elastic pouring piece 2 and the nut 3 are positioned in the ladder section plate 4; the connecting device comprises a bolt 1, an elastic pouring piece 2 sleeved on the upper portion of the bolt 1 and a nut 3 fixedly connected with the upper end of the bolt 1, wherein the elastic pouring piece 2 is dumbbell-shaped, and the elastic pouring piece 2 is made of the flexible hole filling material provided by the first embodiment.

It should be noted that the dumbbell shape is a cylindrical shape having a diameter larger at both ends than at the middle, that is, the elastic potting member 2 is a cylindrical shape having two large ends and a small middle.

When the assembled stair is used, the lower portion of the bolt 1 is inserted into a bracket of the assembled stair, a filling hole matched with the elastic filling piece 2 in shape is formed in the stair section plate 4 of the assembled stair, the upper portion of the bolt 1 is inserted into the filling hole, then the elastic filling material is filled into the filling hole to form the elastic filling piece 2, so that connection between the stair section plate 4 and the bracket is completed, and the assembled stair is formed after the plurality of stair section plates 4 are sequentially connected according to the method.

Compared with the prior art, in the assembled stair that this embodiment provided, the connecting device that the embodiment provided all was adopted at the upper and lower both ends of bench 4 is connected with bracket 7, and the intensity of elasticity pouring member 2 is compared in ordinary grout material lowly, has certain toughness and deformability, and under the reciprocal extrusion effect of bolt 1, elasticity pouring member 2 can take place to warp and does not lose the bearing capacity to can improve the whole power that can bear of connecting device. Meanwhile, when an earthquake occurs, the anti-seismic stair can effectively release the effect of the inclined strut on the stair section plate 4 under the action of horizontal force, weaken the adverse effect of the stair on the main body structure, effectively resist the seismic force perpendicular to the stair running direction, and completely meet the defense level of 'small earthquake damage prevention, medium earthquake repairable and large earthquake fall prevention' in China.

In addition, among the above-mentioned connecting device of assembled stair, the shape of elasticity pouring member 2 is dumbbell shape, and the upper portion diameter of elasticity pouring member 2 is great, can be convenient for install fixation nut 3, and under the effect of normal use stage or little load, nut 3 has the fixed action to bench 4. The diameter of the lower part of the elastic pouring piece is larger, so that the bolt can be promoted to be bent and deformed under larger deformation, and the shearing damage of the bolt 1 is avoided.

Particularly, when the number of earthquake levels is small, the elastic pouring piece 2 can deform to adapt to small earthquake displacement along the stair running direction of the stair, so that the diagonal bracing acting force of the stair under the action of an earthquake can be effectively released; along the running direction of the vertical stair, the inertial force of the stair sections generated by the out-of-plane earthquake is small, and the plurality of connecting devices can uniformly bear the earthquake force. When the earthquake stage number is larger, along the stair running direction of the stair, on one hand, the dumbbell-shaped elastic infusion piece 2 can enable the bolt 1 to be easily bent and deformed, so that the bolt 1 is prevented from being sheared and damaged, on the other hand, the local part of the elastic infusion piece 2 is crushed by the bolt 1, so that energy is consumed, and the inclined strut effect of the stair section under large earthquake deformation can be released to a certain degree; in the direction perpendicular to the running direction of the stairs, the plurality of connection devices uniformly bear the seismic force, and as shown in fig. 8, the connection devices have a certain restoring force due to the action of the elastic injection member 2.

Specifically, the dumbbell-shaped elastic infusion member 2 may include a middle portion 201 and end portions 202 at both ends of the middle portion 201, the middle portion 201 may be in a right cylindrical shape, the diameter of the end portions 202 is gradually increased in a direction away from the middle portion 201, and as can be seen from fig. 3 to 4, an angle between an outer circumferential surface (or a tangent to the outer circumferential surface) of one end of the end portion 202 away from the middle portion 201 and a horizontal direction is greater than 90 °. It will be appreciated that corresponding central and end holes are provided in the flight 4. Illustratively, the diameter of the middle portion 201 may be 50mm to 55mm, the diameter of the end portion 202 near the middle portion 201 may be the same as the diameter of the middle portion 201, and the diameter of the end portion 202 far from the middle portion 201 may be 60mm to 70 mm. In the connection process of the connecting device of the assembled stair, the diameter of the end part 202 positioned above is gradually enlarged, so that the nut 3 can be conveniently connected with the bolt 1; the diameter of the middle part of the elastic pouring piece 2 is not less than 50mm, so as to meet the requirements of site construction and installation; the diameter of the end portion 202 located below is gradually enlarged, a large enough deformation space can be reserved for the bolt 1, under large deformation, the bolt 1 can be further guided to be subjected to bending deformation under large deformation of the main body structure, and shearing damage of the bolt 1 is avoided.

Illustratively, the shape of the end 202 may be of two types: in one form, the cross-section of the end 202 along the axis may be trapezoidal in shape, as shown in FIG. 3; in another shape, the outer peripheral surface of the end portion 202 is a cambered surface, that is, the cross section of the end portion along the axial direction includes a first edge, a second edge, a third edge and a fourth edge, the first edge and the second edge are parallel to each other, one end of the first edge is connected with one end of the second edge through the third edge, the other end of the first edge is connected with the other end of the second edge through the fourth edge, the first edge and the second edge are straight lines, and the third edge and the fourth edge are concave arcs, as shown in fig. 4.

In order to avoid the defect of the lower end portion 202 during the forming process, the angle α between the outer peripheral surface of the end portion 202 and the outer peripheral surface of the middle portion 201 should be controlled to be between 150 ° and 170 °. That is, in the cross section along the axial direction of the elastic potting member 2, the angle between the side edge of the end portion 202 and the side edge of the middle portion 201 is α, which should be controlled to be between 150 ° and 170 °. Alternatively, it will be understood that the sides of the central portion 201 are parallel to the axis of the elastomeric pour 2 and the sides of the end portions 202 are offset counter-clockwise by 10 ° to 30 ° with respect to the sides of the central portion 201. This is because, during the formation of the elastic infusion member 2, the elastic infusion material flows through the end hole located above, the middle hole and the end hole located below in sequence, and due to the fluidity of the elastic infusion material and the middle portion 201 with a smaller diameter, the elastic infusion material may not flow to the corner of the end hole below, thereby forming a defect at this position and affecting the performance of the elastic infusion member 2. The included angle alpha between the outer peripheral surface of the end part 202 and the outer peripheral surface of the middle part 201 is controlled to be more than 150 degrees, so that the outer peripheral surface of the end part 202 is ensured to have smaller inclination relative to the outer peripheral surface of the middle part 201, and the outer peripheral surface can flow to the corner of the end part hole positioned at the lower part in the flowing process of the elastic perfusion material, thereby avoiding the formation of defects at the corner and ensuring the forming and performance of the elastic perfusion piece 2. However, an angle α between the outer peripheral surface of the end portion 202 and the outer peripheral surface of the middle portion 201 is larger than 170 °, which reduces a deformation space of the bolt 1, and causes bending deformation by large deformation of the main structure, thereby easily causing shear failure of the bolt 1.

Illustratively, the upper end of the bench board 4 is connected with the upper corbel 7 through two connecting devices, the lower end of the bench board 4 is connected with the lower corbel 7 through two connecting devices, and the connecting lines of the central points of the four connecting devices form a rectangle. The four connecting devices are uniformly distributed, and when earthquake force is received, the four connecting devices can deform simultaneously to release deformation generated by the earthquake force, so that the earthquake resistance of the fabricated stairway is improved.

Under the general condition, the planarization of the up end of bracket 7 is relatively poor, with bench board 4 direct overlap joint on bracket 7, can influence bench board 4's stability, consequently, be equipped with screed-coat 6 between the up end of bracket 7 and the lower terminal surface of bench board 4, the lower terminal surface of screed-coat 6 and the up end contact of bracket 7, the up end of screed-coat 6 and the lower terminal surface contact of bench board 4, exemplarily, this screed-coat 6 can be 18 ~ 22 mm's cement mortar layer. Because the roughness of screed-coat 6 is higher than the roughness of bracket 7, bench board 4 passes through 6 overlap joints of screed-coat on bracket 7, can guarantee bench board 4's stability, thereby prevents that the unevenness is pour to bracket 7 and influence the accuracy of bench board 4 and take one's place.

In order to avoid collision between the ladder section plates 4 and the ladder beams 5 when vibration occurs, a gap d should be formed between the ladder section plates 4 and the ladder beams 5, the gap d can be 30-50 mm, and the higher the intensity is, the higher the layer height is, the larger the value is. The numerical value can be selected according to displacement calculation, the principle that no collision occurs under the action of a large shock is taken as the principle, the gap is filled with a buffer material (for example, foamed polyurethane), a certain height difference is required between the top surface of the buffer material and the upper end surface of the ladder beam 5, the height difference is 18-22 mm, the height difference can be processed by adopting end face construction, smooth transition is realized, and the attractiveness of the construction surface can be ensured.

In another aspect, the present invention further provides a method for installing an assembled staircase, including the steps of:

step 2: after the ladder beam and the bracket reach the designed strength, a leveling layer with the thickness of 18 mm-22 mm is laid on the bracket, and 1:1 cement mortar is generally adopted for leveling;

and step 3: hoisting the bench plate to a target position, accurately positioning, controlling errors to meet the standard requirement, and inserting the upper part of a bolt into a pouring hole of the bench plate;

and 4, step 4: injecting an elastic filling material into the filling hole, and forming an elastic filling piece after the elastic filling material is shaped;

and 5: screwing a nut at the upper end of the bolt, and filling the filling hole;

step 6: a gap is reserved between the bench slab and the bench beam, the size of the gap is controlled to be 30-50 mm, a buffer material is filled in the gap, a certain height difference is required between the top surface of the buffer material and the upper end surface of the bench beam, usually 18-22 mm, the height difference can be processed by adopting end face construction, and the connection between the bench slab and the corbel is completed;

and 7: and (5) repeating the steps from 2 to 6 until the connection of all the stair section plates and the bracket is completed, and completing the installation of the assembled stair.

Compared with the prior art, the installation method of the fabricated stairway provided by the invention has the beneficial effects basically the same as those of the fabricated stairway, and the detailed description is omitted here.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims

1. A flexible hole filling material for an assembled stair is characterized by comprising the following raw materials in percentage by weight: 6-12% of anionic emulsion, 0.2-0.4% of defoaming agent, 30-50% of cementing material, 40-60% of graded sand, 0.1-0.2% of water reducing agent, 0.1-0.2% of setting time regulator, 0.1-0.2% of anti-settling regulator, 5-10% of steel fiber and the balance of water;

the flexible hole filling material is adopted to manufacture an elastic filling piece, and the shape of the elastic filling piece is dumbbell-shaped;

the initial fluidity of the flexible hole filling material is 260-270 mm, the fluidity in 30min is 250-265 mm, the breaking strength in 28 days is 3.5-3.8 MPa, the compressive strength is 9.3-9.9 MPa, and the deformation value is 10.1-10.4 mm;

the flexible hole filling material is used for anchoring and connecting the end node of the precast concrete slab type stair.

2. The flexible hole filling material for the fabricated stairway as claimed in claim 1, wherein the anionic emulsion is one or a mixture of at least two of acrylic emulsion, styrene and acrylate copolymer emulsion and silicone emulsion in any proportion.

3. The flexible hole-filling material for the fabricated stairway as claimed in claim 1, wherein the cementing material is one or a mixture of at least two of portland cement, aluminate cement, semi-hydrated gypsum and anhydrous gypsum in any proportion.

4. The flexible hole filling material for the fabricated stairway as claimed in claim 1, wherein the defoaming agent is one or a mixture of at least two of vegetable oil, polyether defoaming agent, modified fatty acid and alkoxy compound defoaming agent, special wax and mineral oil defoaming agent in any proportion;

the water reducing agent is one or two of a melamine water reducing agent and a polycarboxylic acid water reducing agent which are mixed in any proportion;

the setting time regulator is one or the mixture of at least two of citric acid, tartaric acid, lithium carbonate and lithium sulfate in any proportion;

the anti-settling regulator is one or a mixture of hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether in any proportion.

5. The flexible hole-filling material for the fabricated stairway as claimed in claim 1, wherein the graded sand is one or a mixture of at least two of machine sand, river sand and tailings sand in any proportion;

the diameter of the steel fiber is 0.1-0.5 mm, and the length of the steel fiber is 10-15 mm.

6. A method for preparing a flexible hole filling material, which is used for preparing the flexible hole filling material as claimed in claims 1 to 5, and comprises the following steps:

7. The preparation method of the flexible hole filling material according to claim 6, wherein in the step 3, the powder is added into the polymer matrix solution at a speed of 80-120 g/s, and the stirring time is 4-6 min.

8. The assembled stair is characterized by comprising a plurality of ladder section plates which are connected up and down, wherein a ladder beam and a bracket are arranged at the joint of two adjacent ladder section plates, the lower end surface of the ladder beam is connected with a fixed beam at the upper end surface of the bracket, the bracket protrudes out of the side surface of the ladder beam, and the two ends of each ladder section plate are respectively lapped on the part, adjacent to the ladder section plate, of the bracket, protruding out of the ladder beam and are fixedly connected with the bracket through a connecting device;

the connecting device comprises a bolt, an elastic pouring piece sleeved on the upper part of the bolt and a nut fixedly connected with the upper end of the bolt, the lower part of the bolt is positioned in the bracket, and the upper part of the bolt, the elastic pouring piece and the nut are positioned in the bench board;

the elastic pouring piece is in a dumbbell shape and is made of the flexible hole pouring material according to any one of claims 1 to 5.

9. The fabricated staircase of claim 8, wherein the elastomeric pourer comprises a middle portion and end portions at opposite ends of the middle portion, the middle portion being shaped as a right cylinder, the end portions increasing in diameter in a direction away from the middle portion.

10. A method of installing a fabricated staircase according to claim 8 or 9, the method comprising the steps of: