Steel-concrete combined prefabricated step plate unit and mounting structure

Abstract

The utility model relates to a steel-concrete combination prefabricated step plate unit and installation structure, the step plate unit includes concrete step, pre-embedded steel rib, screw rod and adjusting nut, the concrete step is flat plate structure, one end of pre-embedded steel rib is embedded in the concrete step, the exposed end of pre-embedded steel rib is provided with a hole, the screw rod passes through the hole, and the screw rod passes through the adjusting nut. Adjusting nuts are respectively sleeved on the screw on two sides of the pre-embedded steel rib, and a fixing hole is arranged on the end face of the screw. When the step plate unit is installed, fixing mechanisms are arranged at the two ends of the bottom of the concrete step respectively, each fixing mechanism comprises a step beam bearing steel plate, a conversion base located at the top of the step beam bearing steel plate and a screw sleeve located at the top of the conversion base, and a perforated baffle is vertically arranged at the front end of the concrete step and fixed to a screw through a screw. And the screws at the two ends of the concrete step are supported and limited by the screw sleeves in the fixing mechanisms at the two ends respectively. The utility model has the advantages of light weight, low cost, low requirement on installation accuracy and easiness in production.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated stairs, in particular to a steel-concrete combined precast tread plate unit and an installation structure thereof. Background Technique

[0002] In the field of prefabricated buildings, the adoption of prefabricated stairs helps to improve the construction speed. The treads of prefabricated stairs in the prior art usually adopt L-shaped precast concrete treads. Bolts are pre-embedded at the bottom of the stair treads in advance, and the installation of the stair treads is completed by connecting the pre-embedded bolts with the steel plates protruding from the side of the stair beam. This stair installation structure requires a high installation accuracy, and the installation accuracy is completely guaranteed by the accuracy of the pre-embedded bolts and the welding accuracy, without much installation adjustment amount, and the production and installation deviations cannot be digested. Moreover, the precast concrete treads need to be reinforced with steel bars in two directions, so that the minimum thickness of the stair treads cannot be less than 80 mm, and the weight of a single stair tread exceeds 100 kg. It is very difficult for manpower to operate this structural design without installation machinery. Even if UHPC (ultra-high performance concrete) materials are used to replace ordinary concrete to reduce the thickness of the tread structure, the cost is too high and it is not suitable for mass production applications. Content of the Utility Model

[0003] The utility model firstly discloses a steel-concrete combined precast tread plate unit, which uses a relatively thin flat plate as the stair tread, can reduce the production difficulty of the tread and the weight of the tread.

[0004] In order to achieve the above object, the technical solution adopted by the utility model is as follows:

[0005] A steel-concrete combined precast tread plate unit includes a concrete tread, pre-embedded steel ribs, screw rods and adjusting nuts. The concrete tread is of a flat plate structure. One end of the pre-embedded steel rib is embedded inside the concrete tread. The exposed end of the pre-embedded steel rib is provided with a hole, and a screw rod is inserted into the hole. Adjusting nuts are respectively sleeved on both sides of the pre-embedded steel rib on the screw rod, and fixing holes are opened on the end face of the screw rod.

[0006] Further, the concrete tread is cast with high-strength concrete above C60.

[0007] Further, two rows of pre-embedded steel ribs are arranged along the width direction inside the concrete tread. One end of the precast steel rib embedded inside the concrete tread is welded with a tensile support foot. At least two holes are spaced along the length direction of the concrete tread on each row of precast steel ribs. The two rows of precast steel ribs are symmetrically arranged, and the corresponding holes of the two rows of precast steel ribs are connected through screw rods.

[0008] Further, anti-slip grooves are provided on the top surface of the concrete tread.

[0009] Further, the screw rod is a full-thread screw rod.

[0010] The present utility model also discloses the installation structure of the above steel-concrete composite precast step plate unit, including fixing mechanisms located at both ends of the steel-concrete composite precast step plate unit, the steel-concrete composite precast step plate unit, and a perforated baffle. The fixing mechanism includes a beam supporting steel plate fixed on the ladder beam, a conversion base fixed on the beam supporting steel plate, and a screw sleeve limited to the top of the conversion base. The perforated baffle is perpendicular to the concrete step and is fixed at the fixing hole of the screw by screws. The screws at both ends of the concrete step are respectively supported and limited by the screw sleeves in the fixing mechanisms at both ends.

[0011] Furthermore, the beam supporting steel plate is of an L-shaped structure. The vertical plate of the beam supporting steel plate is fixedly connected to the ladder beam. Fixing holes are opened at both ends of the horizontal plate of the beam supporting steel plate, and a strip-shaped hole is opened between the two fixing holes at both ends. Strip-shaped holes are opened at both ends of the conversion base, and a fixing hole is opened between the two strip-shaped holes at both ends. Limiting plates are arranged at intervals on the top of the conversion base. The limiting plates are perpendicular to the conversion base. A screw sleeve with an open top is arranged between the two limiting plates. The limiting plates clamp the screw sleeve. The conversion base is placed on the top of the horizontal plate of the beam supporting steel plate, and the conversion base and the horizontal plate of the beam supporting steel plate are fixedly connected by fixing bolts. The adjusting bolt passes through the strip-shaped hole on the horizontal plate of the beam supporting steel plate and the fixing hole on the conversion base in sequence to support the bottom of the screw sleeve.

[0012] Furthermore, the contact surface between the screw sleeve and the screw is an arc surface.

[0013] Furthermore, the perforated baffle is an aluminum plate.

[0014] Furthermore, the horizontal plate and the vertical plate of the beam supporting steel plate are connected by a stiffening plate.

[0015] The concrete step in the precast step plate unit designed by the present utility model is a flat plate, which is easier to process than the L-shaped plate in the prior art and helps to reduce the production difficulty. The concrete step is a thin plate cast with high-strength concrete of about C60, with low cost, small thickness, and the weight of a single step can be reduced by more than 50% compared with the structure in the prior art. The present utility model utilizes the designed concrete step and the embedded steel ribs to form a combined stress state to jointly bear the load. The installation method of the precast step plate unit given by the present utility model realizes the adjustment of three-way positions, can digest the installation error to the greatest extent, and can reduce the high requirements for installation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic side structure diagram of the precast step plate unit in the embodiment;

[0017] Figure 2 It is a schematic front structure diagram of the precast step plate unit in the embodiment;

[0018] Figure 3 Schematic diagram of the side mounting structure of the precast step plate unit in the embodiment;

[0019] Figure 4 Schematic diagram of the front mounting structure of the precast step plate unit in the embodiment;

[0020] Figure 5 is Figure 4 partial enlarged view in;

[0021] Figure 6 is Figure 4 top view of;

[0022] Figure 7 Schematic diagram of the combined installation of the steps of the stair flight in the embodiment.

[0023] Explanation of the reference numerals in the drawings:

[0024] 1. Concrete step; 2. Embedded steel rib; 3. Screw rod; 4. Adjusting nut; 5. Fixing hole; 6. Anti-slip groove; 7. Stair beam supporting steel plate; 8. Conversion base; 9. Fixing bolt; 10. Perforated baffle; 11. Screw; 12. Adjusting bolt; 13. Limiting plate; 14. Screw rod sleeve; 15. Stiffening plate. Specific implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] This embodiment first discloses a steel-concrete composite precast step plate unit, the structure of which is as shown in Figure 1 and Figure 2 , and it is mainly composed of a precast concrete step 1, an embedded steel rib 2, a fully threaded screw rod 3 and an adjusting nut 4. Among them, the concrete step 1 is cast from high-strength concrete of C60 or above, which saves more cost compared with using UHPC material. The concrete step 1 is a flat plate structure, which is easier to process and manufacture. The embedded steel rib 2 is cut from a steel plate, and a tensile support foot is welded perpendicular to the steel plate at one end thereof. The tensile support foot end of the embedded steel rib 2 is buried inside the concrete pedal 1 during pouring, and the remaining part is exposed, and a hole is respectively opened at both ends and the middle of the steel plate at the exposed end. As shown in Figure 1With the shown direction as a reference, in this embodiment, two embedded steel ribs 2 are arranged at intervals on the left and right, and the two embedded steel ribs 2 are symmetrically arranged. The length of the exposed end of each embedded steel rib 2 is slightly less than the length of the concrete step 1. A screw 3 is respectively arranged in each group of corresponding holes between the two embedded steel ribs 2 on the left and right, and the corresponding holes of the two embedded steel ribs 2 are connected by the screw 3. Both ends of the screw 3 penetrate through the embedded steel ribs 2. An adjusting nut 4 is sleeved on both sides of each embedded steel rib on the screw 3. A fixing hole 5 is opened at the end of the exposed screw 3, and threads are arranged on the inner wall of the fixing hole 5. The top surface of the above-mentioned concrete step 1 serves as the stepping surface of the staircase. In order to prevent slipping during stepping, anti-slip grooves 6 are also provided on the top surface of the concrete step 1 in this embodiment.

[0027] When the steel-concrete composite precast step plate unit with the above structure is installed, its structure is as Figures 3 to 6 shown. A fixing mechanism is respectively arranged at both ends of the bottom of the precast step plate unit, and each fixing mechanism is used to fixedly support the corresponding screw 3 at the bottom of the concrete step 1. Among them, the fixing mechanism is mainly composed of a ladder beam supporting steel plate 7, a conversion base 8, a screw sleeve 14 and fasteners such as bolts.

[0028] As Figure 5 shown, the cross-section of the ladder beam supporting steel plate 7 is an L-shaped structure. The ladder beam supporting steel plate 7 is divided into a vertical plate and a horizontal plate. Its vertical plate is welded and fixed to the ladder beam of the staircase. Fixing holes are opened at both ends of the horizontal plate of the ladder beam supporting steel plate 7, and a strip-shaped hole is opened between the two fixing holes at both ends. The length direction of the strip-shaped hole is the same as the length direction of the concrete step 1. The conversion base 8 is a flat plate. Strip-shaped holes are opened at both ends of the conversion base 8, and a fixing hole is opened between the two strip-shaped holes at both ends. The strip-shaped holes of the conversion base 8 correspond to the fixing holes on the horizontal plate of the ladder beam supporting steel plate 7, and the fixing hole of the conversion base 8 corresponds to the strip-shaped hole of the horizontal plate of the ladder beam supporting steel plate 7. Limiting plates 13 are arranged at intervals on the top of the conversion base 8. The limiting plates 13 are perpendicular to and relatively fixed to the conversion base 8. A screw sleeve 14 is arranged between the two limiting plates 13, and the screw sleeve 14 is clamped and limited by the two limiting plates 13 at both ends. The screw sleeve 14 has an open top and a U-shaped cross-section, and the screw sleeve 14 is used to support and limit the screw 3. Therefore, the contact surface between the screw sleeve 14 and the screw 3 is an arc surface. The conversion base 8 is placed on the top of the horizontal plate of the ladder beam supporting steel plate 7. The strip-shaped holes at both ends of the conversion base 8 and the fixing holes at both ends of the horizontal plate of the ladder beam supporting steel plate 7 are fixedly connected by fixing bolts 9. An adjusting bolt 12 is sequentially passed through the strip-shaped hole on the horizontal plate of the ladder beam supporting steel plate 7 and the fixing hole on the conversion base 8, so that the top of the adjusting bolt 12 supports the bottom of the screw sleeve 14.

[0029] According to the above-given structure, the fixed installation of the precast step plate unit can be completed. After installing multiple groups of precast step plate units in the same installation method as above, it can form as Figure 7For the combined structure shown, in order to strengthen the support strength between the horizontal plate and the vertical plate of the ladder beam supporting steel plate 7, a stiffening plate 15 can also be provided between the horizontal plate and the vertical plate. In the formed tread plate combined structure, in order to block the gap between adjacent precast tread plate units, in this embodiment, an aluminum perforated baffle 10 is also provided on the side of each precast tread plate unit. The length of the perforated baffle 10 can be the same as the length of the concrete tread 1. Corresponding holes are opened on the perforated baffle 10, and the perforated baffle 10 is fixedly installed at the fixing hole at the end of the screw rod 3 with screws 11 and limit nuts.

[0030] The installation of the steel-concrete combined precast tread plate unit designed in this embodiment has a three-way adjustable function. With Figure 4 the direction shown as a reference, the position of the conversion base 8 can be moved left and right through the strip holes at both ends of the conversion base 8, so as to realize the left and right position adjustment of the precast tread plate unit. After the position adjustment is in place, the position can be locked and fixed with the fixing bolt 9. The front and back position adjustment of the precast tread plate unit can be realized by the four adjusting nuts 4 on the screw rod 3. For the adjustment in the height direction of the precast tread plate unit, the height of the screw sleeve 14 can be finely adjusted by moving the adjustment bolt 12 up or down. This three-way position adjustment can maximize the digestion of installation errors, so the requirement for installation accuracy is not so high.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precast steel-concrete composite step plate unit, characterized in that: It includes concrete steps, embedded steel ribs, screw rods and adjusting nuts. The concrete steps are of a flat plate structure. One end of the embedded steel rib is embedded inside the concrete steps. The exposed end of the embedded steel rib is perforated, and the screw rod passes through the hole. Adjusting nuts are sleeved on both sides of the embedded steel rib on the screw rod, and fixing holes are opened on the end face of the screw rod.

2. The precast steel-concrete composite step plate unit according to claim 1, characterized in that: The concrete steps are cast with high-strength concrete above C60.

3. A precast steel-concrete composite step plate unit according to claim 1, characterized in that: Two rows of embedded steel ribs are arranged in the width direction inside the concrete steps. One end of the precast steel rib embedded in the concrete steps is welded with a tensile support foot. At least two holes are spacedly opened along the length direction of the concrete steps on each row of precast steel ribs. The two rows of precast steel ribs are symmetrically arranged, and the corresponding holes of the two rows of precast steel ribs are connected through the screw rod.

4. A steel-concrete composite precast step slab unit according to claim 1, characterized in that: The top surface of the concrete steps is provided with anti-slip grooves.

5. A precast steel-concrete composite step plate unit according to claim 1, characterized in that: The screw rod is a full-thread screw rod.

6. The installation structure of the steel-concrete composite precast tread plate unit according to any one of claims 1-5, characterized in that: It includes fixing mechanisms at both ends of the steel-concrete composite precast step plate unit, the steel-concrete composite precast step plate unit and a perforated baffle. The fixing mechanism includes a beam support steel plate fixed on the ladder beam, a conversion base fixed on the beam support steel plate, and a screw rod sleeve limited on the top of the conversion base. The perforated baffle is perpendicular to the concrete steps and is fixed at the fixing hole of the screw rod by screws. The screw rods at both ends of the concrete steps are respectively supported and limited by the screw rod sleeves in the fixing mechanisms at both ends.

7. The mounting structure according to claim 6, characterized in that: The beam support steel plate is of an L-shaped structure. The vertical plate of the beam support steel plate is fixedly connected with the ladder beam. Fixing holes are opened at both ends of the horizontal plate of the beam support steel plate, and a strip-shaped hole is opened between the two fixing holes at both ends; strip-shaped holes are opened at both ends of the conversion base, and a fixing hole is opened between the two strip-shaped holes at both ends. Limiting plates are spacedly arranged on the top of the conversion base. The limiting plates are perpendicular to the conversion base. A screw rod sleeve with an open top is arranged between the two limiting plates. The limiting plates clamp the screw rod sleeve. The conversion base is placed on the top of the horizontal plate of the beam support steel plate, and the conversion base and the horizontal plate of the beam support steel plate are fixedly connected by fixing bolts. The adjusting bolt passes through the strip-shaped hole on the horizontal plate of the beam support steel plate and the fixing hole on the conversion base in sequence and then supports the bottom of the screw rod sleeve.

8. The installation structure according to claim 6, wherein: The contact surface between the screw rod sleeve and the screw rod is an arc surface.

9. The mounting structure according to claim 6, characterized in that: The perforated baffle is an aluminum plate.

10. The mounting structure according to claim 7, wherein: The horizontal plate and the vertical plate of the beam support steel plate are connected by a stiffening plate.

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