A forming device and method for producing precast concrete stairs

Abstract

The application belongs to the technical field of concrete stair production, and particularly relates to a forming device and method for producing prefabricated concrete stairs, wherein the device comprises: a base, a forming groove being fixedly arranged in the middle of the base, a sliding assembly, a pressing assembly being slidingly arranged at the middle of the sliding assembly and used for mold forming of the prefabricated concrete stairs, a hinge assembly being arranged at the upper end of the pressing assembly, a fixed support, a lifting assembly being arranged at the middle of the fixed support, and a transmission assembly being arranged at the right end of the lifting assembly and used for driving the lifting assembly to rotate. Through the design of the composite pulley, a groove is arranged at the lower end surface of the composite pulley, so that the horizontal rotating relationship between the circular ring groove and the annular positioning frame is ensured, and the annular positioning frame limits the movement freedom of the circular ring groove in the horizontal direction. The stable and reliable power transmission is ensured, the self-locking property of the screw transmission is ensured, the resetting rebound of the entire device caused by the tension of the concrete leakage at the mold forming end is avoided, and the yield is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of concrete stair production, and particularly relates to a forming device and method for producing prefabricated concrete stairs. BACKGROUND

[0002] The prefabricated stair in the factory production uses a template that can be reused, and the operation procedure is simplified. The prefabricated stair is similar to a flow line in industrial production, is skilled in operation, and greatly shortens the production period. The prefabricated stair uses a fixed template in production, effectively avoids quality defects such as inconsistent step heights, inconsistent bottom elevations of ladder sections, unsatisfied thickness of a steel bar protective layer, crooked, uneven and disordered drip bars, and uneven surface, and is widely applied in prefabricated buildings due to high quality standards and few quality defects.

[0003] A patent with a publication number CN112663882A discloses a light and thin beam type prefabricated stair of super high performance concrete and a forming process thereof. The prefabricated stair includes steps, platforms and inclined beams. The prefabricated stair is made of super high performance concrete. The number of steps is freely combinable. The selected number of steps is connected with the platforms through cast-in-place inclined beams. The prefabricated stair has a simple structure, and a design scheme of an assemblable step is provided. The problem of inflexible adjustment of a template volume of a traditional prefabricated stair is solved. The cross-sectional size of a stair part is reduced to reduce the self weight and cost under the premise of meeting the stair bearing capacity and normal use conditions by using the super high strength, super high toughness and super high durability of super high performance concrete.

[0004] In the preparation of the prefabricated stair, the existing technology often causes forming size errors of the prefabricated part due to the difficulty in ensuring the constant position of the mold when the mold is fixed, thereby increasing the rejection rate. Therefore, it is necessary to design a forming device that can not only be suitable for different stair size specifications, but also ensure the stability of the entire forming device during concrete forming. SUMMARY

[0005] The present application aims to provide a forming device and method for producing prefabricated concrete stairs to solve the problems in the background art. To achieve the above-mentioned purpose, the following technical solutions are provided: a forming device and method for producing prefabricated concrete stairs, wherein the device includes:

[0006] The base is provided with a shaped groove in the middle, a sliding assembly is fixedly arranged on the upper end surface of the base, a pressing assembly is slidably arranged on the middle of the sliding assembly, and the pressing assembly is used for mold forming of the prefabricated concrete stair; the upper end of the pressing assembly is provided with a hinged assembly; a fixed support is fixedly arranged on the upper end surface of the base, a lifting assembly is arranged on the middle of the fixed support, and the hinged assembly is fixedly arranged on the lower end of the lifting assembly; the right end of the lifting assembly is provided with a transmission assembly for driving the lifting assembly to rotate.

[0007] In the technical solution, first, according to the step specifications of the prefabricated concrete stair, a mold of appropriate size is selected, and then the vertical inner mold is embedded and installed in the pressing assembly clamping groove; the transmission assembly is started, the motor drives the belt transmission, and the lifting assembly is driven by the threaded transmission, so that the vertical position of the lifting assembly is lifted and the hinged assembly is lifted; when the hinged assembly is lifted, the pressing assembly is slid out from the sliding assembly under the action of the hinged assembly, until the distance between the two pressing assemblies meets the thickness of the prefabricated stair, the motor is turned off, and the concrete is poured into the mold composed of the pressing assembly and the bottom surface of the shaped groove, and the prefabricated concrete stair is formed after the concrete is solidified.

[0008] In any of the above technical solutions, further, the lifting assembly comprises:

[0009] A through hole is fixedly arranged in the middle of the fixed support, an annular positioning frame is fixedly arranged on the upper end surface of the fixed support, a composite pulley is rotatably arranged on the upper end of the annular positioning frame, a circular ring groove is fixedly arranged on the lower end surface of the composite pulley, the annular positioning frame can be rotatably embedded in the circular ring groove, a screw hole is fixedly arranged in the middle of the composite pulley, a threaded rod is threadedly connected in the screw hole, and the screw hole and the threaded rod are coaxial; and the threaded rod is threadedly connected in the screw hole.

[0010] In the technical solution, the composite pulley is designed, the lower end surface of the composite pulley is slotted, the annular positioning frame can be embedded in the circular ring groove, and the annular positioning frame limits the movement freedom of the circular ring groove in the horizontal direction in addition to the horizontal rotation relationship between the circular ring groove and the annular positioning frame; in this way, when the screw hole and the threaded rod are threadedly transmitted, the resistance of the threaded rod is always vertically downward, the annular positioning frame can tightly abut against the upper groove surface of the circular ring groove, and the composite pulley cannot be separated from the annular positioning frame due to mechanical vibration during transmission; the power transmission is stable and reliable, and the stability of the entire device is improved; the threaded transmission itself has self-locking property, avoiding the reset rebound of the entire device caused by the tension of the concrete leakage of the pressing assembly at the mold forming end, and improving the yield.

[0011] In any of the above technical solutions, further, the transmission assembly comprises:

[0012] L plate, fixedly arranged on the right end of the upper end surface of the fixed support, the L plate is fixedly provided with a motor, the lower end rotating end of the motor is fixedly provided with a driving pulley, the driving pulley is sleeved with a belt, the other end of the belt is sleeved on a composite pulley, and the composite pulley is used for driving the composite pulley to rotate.

[0013] In the technical solution, the driving pulley and the composite pulley are driven through the belt transmission when the motor drives the driving pulley to rotate, and when the rotating load of the end of the composite pulley is too large, the belt slips during transmission, so that the motor can be effectively protected from overload, and the safety hazard of the motor burning out due to overload during operation is avoided.

[0014] In any of the above technical solutions, further, the sliding assembly comprises:

[0015] The fixed support is provided with a horizontal sliding hole in the upper end, a sliding rod is slidably arranged in the horizontal sliding hole, a side vertical fixed table is slidably arranged in the middle part of the sliding rod, a fixed hole is fixedly arranged on the right vertical surface of the side vertical fixed table, a hanging pin is fixedly arranged on the upper end surface of the side vertical fixed table, and the lower end surface of the side vertical fixed table always abuts against the lower end surface of the forming groove and can keep sliding.

[0016] Specifically, the pressing assembly comprises:

[0017] The right angle forming plates are embedded in the hanging pins, the vertical surfaces of the right angle forming plates are right-angled and parallel, respectively, the front and rear surfaces of the forming groove are provided with the partition plates, and the right angle forming plates and the two partition plates form the prefabricated forming mold of the concrete.

[0018] In the technical solution, the horizontal sliding hole and the sliding rod are arranged, a plurality of sliding rods are designed, the stability of the sliding assembly during horizontal sliding is ensured, the pressing assemblies connected to the two ends of the sliding assembly slide out in opposite directions, and thus the size of the prefabricated concrete stair is automatically adjusted.

[0019] In any of the above technical solutions, further, the hinged assembly comprises:

[0020] The connecting block is fixedly arranged on the upper end of the side vertical fixed table, a cylindrical pin is fixedly connected to the connecting block, and a swing rod is hingedly arranged on the cylindrical pin; the other end of the swing rod is hingedly provided with a hinged boss, a moving platform is fixedly arranged in the middle part of the hinged boss, and the upper end surface of the moving platform is fixedly connected to the lower end of the lifting assembly.

[0021] In the technical solution, the hinged assemblies hingedly connected to the two ends of the pressing assembly are driven to move up and down, the pressing assemblies are driven to approach and move away from each other, the displacement of the lifting assembly in the vertical direction is converted into the horizontal position displacement of the pressing assembly, and the opening and closing of the prefabricated concrete stair forming mold are realized.

[0022] A method of using a molding device for producing precast concrete stairs:

[0023] Step 1: First, select a right-angled molding plate of a specific size according to the specifications and dimensions of the precast concrete stair steps. Then, embed the right-angled molding plate into the slots of the hanging pins and fixing holes.

[0024] Step 2: Start the transmission assembly. The motor drives the drive pulley and the composite pulley to rotate. At this time, threaded transmission occurs between the composite pulley and the threaded rod, causing the threaded rod to move upward and drive the moving platform to move upward.

[0025] Step 3: When the lifting component moves the hinge component upward, the two swing arms swing upward and pull the side facade fixing platform, so that the two side facade fixing platforms move closer to each other.

[0026] Step 4: When the two pins are pulled closer to each other, the slide rod slides from the horizontal sliding hole until the distance between the two pins matches the thickness of the precast staircase. Then, stop the motor and pour concrete into the mold consisting of a right-angle forming plate, partition, and the bottom of the forming groove. After the concrete solidifies, the precast concrete staircase is formed.

[0027] The beneficial effects of this invention are as follows: By designing the composite pulley, a groove is cut into the lower end face of the composite pulley, allowing the annular positioning frame to be embedded in the circular groove. This ensures that, apart from a horizontal rotational relationship, the annular positioning frame restricts the horizontal movement freedom of the circular groove. Consequently, during the reverse thread transmission between the screw hole and the threaded rod, the resistance experienced by the threaded rod is always vertically downward, allowing the annular positioning frame to press firmly against the upper surface of the circular groove. Furthermore, mechanical vibrations during transmission will prevent the composite pulley from disengaging from the annular positioning frame. This ensures smooth and reliable power transmission and improves the overall stability of the device. Additionally, the threaded transmission itself has self-locking properties, preventing the entire device from springing back due to the tension released from the concrete at the mold forming end, thus improving the yield rate. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0029] Figure 2 In this invention Figure 1 Schematic diagram at point AA;

[0030] Figure 3 yes Figure 1 A magnified view of a portion of the image;

[0031] Figure 4 yes Figure 3 Diagram of section BB;

[0032] Figure 5 is a three-dimensional structural diagram of the lifting assembly in the present application.

[0033] In the figure, the reference signs are: 10, base; 11, forming groove; 12, partition; 20, sliding assembly; 21, fixed frame; 22, horizontal sliding hole; 23, sliding rod; 30, pressing assembly; 31, side vertical fixed table; 32, fixed hole; 33, hanging pin; 34, hanging frame; 35, right-angle forming plate; 40, hinged assembly; 41, joint block; 42, cylindrical pin; 43, swing lever; 44, moving platform; 45, hinged boss; 50, fixed support; 60, lifting assembly; 61, through hole; 62, threaded rod; 63, annular positioning frame; 64, composite pulley; 65, circular ring groove; 66, screw hole; 70, transmission assembly; 71, L plate; 72, motor; 73, driving pulley; 74, belt. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that the terms used herein are only intended to describe the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. The technology, methods and devices known to those skilled in the relevant art can not be discussed in detail, but should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0036] As Figure 1 shown, the present embodiment provides a forming device and method for producing prefabricated concrete stairs, wherein the device comprises:

[0037] The base 10, the middle part of the base 10 is fixedly provided with a shaped groove 11, the upper end surface of the base 10 is fixedly provided with a sliding assembly 20, the middle part of the sliding assembly 20 is slidably provided with a pressing assembly 30, the pressing assembly 30 is used for mold forming of the prefabricated concrete stair; the upper end of the pressing assembly 30 is provided with a hinged assembly 40; a fixed support 50 is fixedly arranged at the upper end surface of the base 10, the middle part of the fixed support 50 is provided with a lifting assembly 60, the hinged assembly 40 is fixedly arranged at the lower end of the lifting assembly 60; the right end of the lifting assembly 60 is provided with a transmission assembly 70, which is used for driving the lifting assembly 60 to rotate.

[0038] In the technical solution, first, according to the step specifications of the prefabricated concrete stair, a mold of appropriate size is selected, and then the vertical inner mold is embedded and installed in the pressing assembly 30 clamping groove; the transmission assembly 70 is started, the motor drives the belt transmission, and the lifting assembly 60 is driven to move up by screw transmission, so that the vertical position of the lifting assembly 60 is lifted, and the hinged assembly 40 is lifted; when the hinged assembly 40 is lifted, under the action of the hinged assembly 40 pulling, at this time, the pressing assembly 30 slides out from the sliding assembly 20, until the distance between the two pressing assemblies 30 meets the thickness of the prefabricated stair, the motor is turned off and the concrete is poured into the mold composed of the pressing assembly 30 and the bottom surface of the shaped groove 11, until the concrete is solidified to complete the molding of the prefabricated concrete stair.

[0039] As shown in Figure 3 , 4 , 5, specifically, the lifting assembly 60 comprises:

[0040] The through hole 61 is fixedly arranged in the middle part of the fixed support 50, the upper end surface of the fixed support 50 is fixedly provided with an annular positioning frame 63, the upper end of the annular positioning frame 63 is rotatably provided with a composite pulley 64, the lower end surface of the composite pulley 64 is fixedly provided with a circular ring groove 65, the annular positioning frame 63 can be rotatably embedded in the circular ring groove 65, and the middle part of the composite pulley 64 is fixedly provided with a threaded hole 66, a threaded rod 62 is threadedly connected in the threaded hole 66, and the threaded hole 66 and the threaded rod 62 are coaxial; and the threaded rod 62 is threadedly connected in the threaded hole 66.

[0041] In the technical solution, the composite pulley 64 is designed, a circular ring groove 65 is formed at the lower end surface of the composite pulley 64, the annular positioning frame 63 can be embedded in the circular ring groove 65, and the annular positioning frame 63 limits the movement freedom of the circular ring groove 65 in the horizontal direction in addition to the horizontal rotation relationship between the circular ring groove 65 and the annular positioning frame 63. When the screw hole 66 and the threaded rod 62 are threadedly driven, the resistance to the threaded rod 62 is always vertically downward, the annular positioning frame 63 can tightly abut the groove surface of the circular ring groove 65, and the composite pulley 64 cannot be separated from the annular positioning frame 63 due to mechanical vibration during driving. The stability of the entire device is improved, and the self-locking property of the threaded driving avoids the reset rebound of the device caused by the tension of the concrete leakage of the mold forming end, and the yield is improved.

[0042] In a preferred embodiment of the present application,

[0043] As shown in Figure 3 , specifically, the transmission assembly 70 comprises:

[0044] The L-shaped plate 71 is fixedly arranged at the right end of the upper end surface of the fixed support 50, the motor 72 is fixedly arranged on the L-shaped plate 71, the driving pulley 73 is fixedly arranged at the lower end rotating end of the motor 72, the belt 74 is sleeved on the driving pulley 73, the other end of the belt 74 is sleeved on the composite pulley 64, and the composite pulley 64 is driven to rotate.

[0045] In the technical solution, the driving pulley 73 is driven to rotate by starting the motor 72, the transmission between the driving pulley 73 and the composite pulley 64 is achieved through the belt transmission, and when the rotating load of the composite pulley 64 is too large, the belt slips during transmission. At this time, the motor 72 can be effectively overloaded to avoid the safety hazard of the motor 72 being burned out due to overloading during operation.

[0046] In a preferred embodiment of the present application,

[0047] As shown in Figure 1 , 2 , specifically, the sliding assembly 20 comprises:

[0048] The fixed support 21 is fixedly arranged on the horizontal sliding hole 22, the sliding rod 23 is slidably arranged in the horizontal sliding hole 22, the side vertical surface fixed table 31 is slidably arranged at the middle portion of the sliding rod 23, the fixed hole 32 is fixedly arranged at the right vertical surface of the side vertical surface fixed table 31, the hanging pin 33 is fixedly arranged at the upper end surface of the side vertical surface fixed table 31, and the lower end surface of the side vertical surface fixed table 31 always abuts against the lower end groove surface of the forming groove 11 and can keep sliding.

[0049] Specifically, the pressing assembly 30 comprises:

[0050] The right-angled forming plate 35 has two upper ends embedded in the hanging pin 33, and the vertical upright surface of the right-angled forming plate 35 is right-angled and parallel, respectively, and the front and rear groove surfaces of the forming groove 11 are provided with the partition plate 12, and the right-angled forming plate 35 and the two partition plates 12 form a prefabricated forming mold for concrete.

[0051] In the technical solution, the horizontal sliding hole 22 and the sliding rod 23 are arranged, a plurality of sliding rods are designed, the stability of the sliding assembly 20 during horizontal sliding is ensured, the pressing assembly 30 connected to the two ends of the sliding assembly 20 slides out in opposition with the sliding assembly 20, and thus the size of the prefabricated concrete stair is automatically adjusted.

[0052] In a preferred embodiment of the present application,

[0053] As shown in Figure 1 , 2 , specifically, the hinged assembly 40 comprises:

[0054] The connecting block 41 is fixedly arranged at the upper end of the side upright surface fixed table 31, the cylindrical pin 42 is fixedly connected to the connecting block 41, and the swing rod 43 is hingedly arranged on the cylindrical pin 42; the other end of the swing rod 43 is hingedly arranged with the hinged boss 45, the moving platform 44 is fixedly arranged at the middle part of the hinged boss 45, and the upper end surface of the moving platform 44 is fixedly connected to the lower end of the lifting assembly 60.

[0055] In the technical solution, the hinged assembly 40 hinged to the two ends of the pressing assembly 30 is driven to move up and down, the pressing assembly 30 is driven to move close to each other and move away from each other, the displacement of the lifting assembly 60 in the vertical direction is converted into the horizontal position movement of the pressing assembly 30, and the opening and closing of the prefabricated concrete stair forming mold are realized.

[0056] A use method of a forming device for producing a prefabricated concrete stair:

[0057] Step one: first, select a right-angled forming plate 35 with a specific size according to the step size of the prefabricated concrete stair, then embed the right-angled forming plate 35 in the clamping groove of the hanging pin 33 and the fixed hole 32,

[0058] Step two: start the transmission assembly 70, drive the driving pulley 73 and the composite pulley 64 to rotate through the motor 72, at this time, the composite pulley 64 and the threaded rod 62 are in threaded transmission, so that the threaded rod 62 moves upward to drive the moving platform 44 to move upward;

[0059] Step three: when the lifting assembly 60 drives the hinged assembly 40 to move upwards, the two swing rods 43 swing upwards and pull the side vertical fixed tables 31, so that the two side vertical fixed tables 31 are close to each other;

[0060] Step four: when the two hanging pins 33 are pulled to be close to each other, the slide rod 23 slides from the horizontal slide hole 22 until the distance between the two hanging pins 33 meets the thickness of the prefabricated stair, the motor 72 is stopped, then the concrete is poured into the mold composed of the right-angle forming plate 35, the partition plate 12 and the bottom surface of the forming groove 11, and the prefabricated concrete stair is completed after the concrete is solidified.

[0061] The embodiments of the present application are described above in combination with the drawings, the embodiments and the features in the embodiments in the present application can be combined with each other without conflict, the present application is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative but not restrictive, the ordinary skilled in the art can make many forms without departing from the scope of the present application under the inspiration of the present application, which are all within the protection of the present application.

Claims

1. A molding device for producing precast concrete stairs, characterized in that, include: A base (10) is provided with a forming groove (11) fixed in the middle of the base (10). A sliding component (20) is fixedly provided on the upper end face of the base (10). A pressing component (30) is slidably provided in the middle of the sliding component (20). The pressing component (30) is used for mold forming of precast concrete stairs. A hinge component (40) is provided at the upper end of the pressing component (30). A fixed bracket (50) is fixedly provided on the upper end face of the base (10). A lifting component (60) is provided in the middle of the fixed bracket (50). The hinge component (40) is fixedly provided at the lower end of the lifting component (60). A transmission component (70) is provided at the right end of the lifting component (60) for driving the lifting component (60) to rotate. The lifting component (60) includes: A through hole (61) is fixedly opened in the middle of the fixed bracket (50). An annular positioning frame (63) is fixedly provided on the upper end face of the fixed bracket (50). A composite pulley (64) is rotatably provided on the upper end of the annular positioning frame (63). A circular annular groove (65) is fixedly provided on the lower end face of the composite pulley (64). The annular positioning frame (63) can be rotatably embedded in the circular annular groove (65). A screw hole (66) is fixedly provided in the middle of the composite pulley (64). A threaded rod (62) is threadedly connected in the screw hole (66). The screw hole (66) and the threaded rod (62) are coaxial. The threaded rod (62) is threadedly connected in the screw hole (66). The transmission assembly (70) includes: L-plate (71) is fixedly installed on the right end of the upper surface of the fixed bracket (50). A motor (72) is fixedly installed on L-plate (71). A drive pulley (73) is fixedly installed at the lower rotating end of the motor (72). A belt (74) is sleeved on the drive pulley (73). The other end of the belt (74) is sleeved on the composite pulley (64) for driving the composite pulley (64) to rotate.

2. The molding device for producing precast concrete stairs according to claim 1, characterized in that, The sliding component (20) includes: A fixed frame (21) is provided with a horizontal sliding hole (22) fixed on the upper part of the fixed frame (21). A sliding rod (23) is slidably provided in the horizontal sliding hole (22). A side-mounted fixed platform (31) is slidably provided in the middle of the sliding rod (23). A fixed hole (32) is fixedly provided on the right side of the side-mounted fixed platform (31). A hanging pin (33) is fixedly provided on the upper end face of the side-mounted fixed platform (31). The lower end face of the side-mounted fixed platform (31) is always in contact with the lower end groove surface of the forming groove (11) and can maintain close sliding.

3. The molding device for producing precast concrete stairs according to claim 2, characterized in that, The pressing assembly (30) further includes: Two right-angle forming plates (35) are provided, and the upper end of the right-angle forming plate (35) is embedded in the hanging pin (33). The vertical surfaces of the right-angle forming plate (35) are respectively right-angled and parallel. The front and rear groove surfaces of the forming groove (11) are provided with partitions (12). The right-angle forming plate (35) and the two partitions (12) constitute a precast forming mold for concrete.

4. The molding device for producing precast concrete stairs according to claim 3, characterized in that, The hinge assembly (40) includes: A connecting block (41) is fixedly installed on the upper end of the side facade fixing platform (31). A cylindrical pin (42) is fixedly connected to the connecting block (41). A swing rod (43) is hinged to the cylindrical pin (42). A hinge boss (45) is hinged to the other end of the swing rod (43). A moving platform (44) is fixedly installed in the middle of the hinge boss (45), and the upper end face of the moving platform (44) is fixedly connected to the lower end of the lifting assembly (60).

5. A method of using the molding apparatus for producing precast concrete stairs as described in any one of claims 1-4, characterized in that: Step 1: First, select a right-angle forming plate (35) of a specific size according to the step size of the precast concrete staircase. Then, embed the right-angle forming plate (35) into the slots of the hanging pin (33) and the fixing hole (32). Step 2: Start the transmission assembly (70). Drive the drive pulley (73) and the composite pulley (64) to rotate through the motor (72). At this time, the composite pulley (64) and the threaded rod (62) will have a threaded transmission, which will cause the threaded rod (62) to move upward and drive the moving platform (44) to move upward. Step 3: When the lifting component (60) drives the hinge component (40) to move upward, the two swing rods (43) swing upward and pull the side facade fixing platform (31), so that the two side facade fixing platforms (31) move closer to each other; Step 4: When the two pins (33) are pulled closer to each other, the slide bar (23) slides from the horizontal sliding hole (22) until the distance between the two pins (33) meets the thickness of the precast staircase. Then, the motor (72) is stopped, and concrete is poured into the mold composed of the right-angle forming plate (35), the partition (12) and the bottom surface of the forming groove (11). The precast concrete staircase is formed after the concrete solidifies.

Images