New type manufacturing process of steel-concrete composite pipe

Abstract

The new manufacturing process of the steel-concrete composite pipe comprises the following steps: processing and manufacturing thin steel plates and two channel steels according to the design size; horizontally arranging two thin steel plates in a rectangular shape and corresponding to each other in up and down directions, and fixing the interval of the two thin steel plates; vertically drilling a plurality of bolted tendons into the two thin steel plates, and fastening and connecting the two thin steel plates by the bolted tendons; horizontally pushing the two channel steels into left and right openings of the two thin steel plates; welding the thin steel plates and the contacted channel steels; installing a rectangular cylindrical steel wire mesh on the outside of the rectangular tubular structure; and pouring concrete on the outside of the rectangular steel pipe structure. The existing steel-concrete composite pipe is improved, the pull connection effect between the two thin steel plates is improved, it is ensured that the thin steel plates do not expand outward when pouring the internal concrete, the strength of the channel steel is improved, the smooth butt joint between the channel steel and the two thin steel plates is more convenient, the length of the bolted nails is prolonged, and the integrated performance of the connection between the internal and external concrete is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fabricated building, and particularly relates to a novel manufacturing process of a steel-concrete composite pipe. BACKGROUND

[0002] At present, the steel-concrete composite pipe used in the fabricated building has been applied in engineering, and the existing steel-concrete composite pipe still has the following problems in actual engineering.

[0003] 1. When the pipe is manufactured in the factory, a plurality of through holes are first punched on the two thin steel plates, and then the tie bars are inserted into the corresponding through holes between the two thin steel plates, and the tie bars are threadedly connected with the through holes. When the rectangular cavity between the two thin steel plates is cast in situ, the two thin steel plates are often expanded outward due to the vibration of the vibrating rod, which causes cracks in the outer concrete of the prefabricated wall, thereby affecting the construction quality of the wall.

[0004] 2. A vertical channel steel is arranged on the left and right sides of the two steel plates, and the openings of the two channel steels are arranged opposite to each other. When the channel steel is moved to the left and right openings of the two thin steel plates during the manufacturing in the factory, the channel steel sides will be correspondingly pressed against the edges of the thin steel plates, thereby affecting the smooth pushing of the channel steel into the interior of the two thin steel plates.

[0005] 3. The tie bars on the outer side of the channel steel are welded on the channel steel, which affects the connection strength of the tie bars and the reliability of the outer concrete. SUMMARY

[0006] The present application provides a novel manufacturing process of a steel-concrete composite pipe, which has high connection strength between the two thin steel plates, is easy to install the channel steel, and greatly improves the connection strength of the tie bars connected with the channel steel, the strength and stability of the outer concrete.

[0007] To solve the above technical problems, the present application adopts the following technical scheme: a novel manufacturing process of a steel-concrete composite pipe, comprising the following steps,

[0008] (1) The thin steel plates and the two channel steels are processed and manufactured according to the design size. The thin steel plates are rectangular, the length of the channel steel is equal to that of the thin steel plate, and a plurality of tie bars are arranged on the bottom plate of the channel steel along the length direction;

[0009] (2) The two rectangular thin steel plates are arranged horizontally and correspondingly up and down, and the distance between the two thin steel plates is fixed;

[0010] (3) A plurality of tie bars are vertically drilled into the two thin steel plates, and the tie bars tightly connect the two thin steel plates;

[0011] (4) One of the front and rear channel steels is horizontally pushed to the left opening of the two thin steel plates, and the other of the front and rear channel steels is horizontally pushed to the right opening of the two thin steel plates.

[0012] (5) weld the left side of the thin steel plate to the left channel steel and the right side of the thin steel plate to the right channel steel to form a rectangular tubular structure with open front and back ends;

[0013] (6) install a rectangular wire mesh on the outside of the rectangular tubular structure, and the tie bars and the tie rods are fixedly connected to the wire mesh;

[0014] (7) pour concrete on the outside of the rectangular steel pipe structure, and the wire mesh is embedded in the outside concrete.

[0015] The tie rod in step (1) is a trapezoidal threaded rod, the channel steel is provided with a left-right through hole, the trapezoidal threaded rod passes through the hole and is threadedly connected to the hole, the inner end of the trapezoidal threaded rod extends into the rectangular steel pipe structure and is threadedly connected with an inner nut, the outer end of the trapezoidal threaded rod is threadedly connected with an outer nut, and the outer nut is connected to the wire mesh by welding. First, insert the tie rod into the hole on the channel steel and spot weld it, then screw the inner nut and outer nut on the two ends of the tie rod.

[0016] The tie bar in step (3) is a drilled conical screw rod, which is vertically drilled into two thin steel plates and is threadedly connected to the two thin steel plates. The drilled conical screw rod includes a rod portion and a head portion larger than the maximum outer diameter of the rod portion. The heads of adjacent two drilled conical screw rods are located on the front side and the back side of the rectangular steel pipe structure, respectively.

[0017] The rod portion is fixedly connected to the head portion at one end, and from the other end of the rod portion to the head portion, it is in sequence a drill bit, a conical flanging segment, a threaded tapping segment, a smooth rod segment, and a straight threaded connection segment. The wire mesh is fixedly connected to the drill bit of each drilled conical screw rod by welding.

[0018] The major diameter of the drill bit is equal to the minor diameter of the conical flanging segment, and the thread minor diameter of the threaded tapping segment is equal to the major diameter of the conical flanging segment. The diameter of the smooth rod segment is less than or equal to the thread minor diameter of the threaded tapping segment. The thread major diameter of the straight threaded connection segment is greater than the thread major diameter of the threaded tapping segment. The straight threaded connection segment and the threaded tapping segment of the same drilled conical screw rod are threadedly connected to the front and back two thin steel plates, respectively.

[0019] In step (3), the rotating drilling device clamps the head of the drilling conical screw rod and drives the rod to rotate, and the rotating drilling device is arranged below the lower thin steel plate and above the upper thin steel plate, and the two sets of rotating drilling devices operate simultaneously, wherein the rotating drilling device above clamps the drilling conical screw rod to drill and tap the two thin steel plates from top to bottom, and the specific process is as follows: the drill bit at the lower end of the rod drills the upper thin steel plate first, then the conical flanging segment extrudes the hole wall of the drilled small hole downward, so that the hole wall is turned downward from the lower surface of the upper thin steel plate, the length of the hole is greater than the thickness of the thin steel plate, after the conical flanging segment turns the hole to extend the length of the hole, the thread tapping segment enters the hole (referred to as extruding silk), extrudes the internal thread of the hole wall, until the upper end of the thread tapping segment passes through the lower end of the hole, then the smooth rod segment passes through the hole with the extruded internal thread, and finally the lower end of the straight thread connection segment starts to screw into the hole with the internal thread, at the same time, the drill bit moves downward to drill the lower thin steel plate, then the conical flanging segment extrudes the hole wall of the drilled small hole of the lower thin steel plate downward, so that the hole wall is turned downward from the lower surface of the lower thin steel plate, the length of the hole is greater than the thickness of the thin steel plate, after the conical flanging segment turns the hole to extend the length of the hole, the thread tapping segment enters the hole, until the distance between the upper end of the head and the upper surface of the upper thin steel plate is equal to the distance between the lower end of the drill bit and the lower surface of the lower thin steel plate, and the drilling is stopped, at this time, the thread tapping segment is threadedly connected with the lower thin steel plate, and the straight thread connection segment is threadedly connected with the upper thin steel plate.

[0020] In step (1), when the channel steel is processed, the open side of the channel steel is relatively bent to form a guide necking structure; in step (4), when the channel steel moves to the open side of the two thin steel plates, the guide necking structure first enters the inside of the two thin steel plates and guides the whole channel steel to smoothly enter the inside of the open side of the two thin steel plates.

[0021] By adopting the technical scheme, the application has the following technical effects:

[0022] 1. The bolted reinforcement uses a drilling conical screw rod, and the drilling and the threading process are combined by using the above-mentioned rotating drilling and nailing connection mode to connect the two thin steel plates, that is, drilling, hole turning, extruding silk and thread connection are performed in sequence, so that the operation process is simplified, the construction operation is more convenient and fast, the length of the thread connection is extended by hole turning, and the reliability of the connection between the thin steel plates and the bolted reinforcement is greatly improved. Half of the number of drilling conical screw rods drill from top to bottom, and the other half of the number of drilling conical screw rods drill from bottom to top, so that the pulling force of the thread connection of the two thin steel plates with the drilling conical screw rods is balanced. The thread tapping segment has the function of tapping (extruding silk), and both the straight thread connection segment have the function of threadedly connecting with the drilled hole and pulling the two thin steel plates.

[0023] 2. The steel wire mesh is welded with the drill bit of each drilling conical screw rod and the outer nut at the outer end of the bolt, without binding, so as to improve the reliability of the fixed connection.

[0024] 3. In the factory, when the steel concrete composite pipe is made, two thin steel plates are connected into one through a plurality of bolted tendons, and then two channel steels are installed between the left and right sides of the two thin steel plates. In order to facilitate the open side of the channel steel to move into the two thin steel plates, and to avoid the pressure on the thin steel plate, the open side of the channel steel is provided with a guide and necking structure. This not only ensures the smooth assembly of the channel steel within the allowable error range, but also improves the strength of the channel steel itself.

[0025] 4. The bolt is lengthened, the inner end is inserted into the rectangular steel pipe structure, and the inner nut is arranged. After the concrete is poured in the rectangular steel pipe structure, the inner nut can improve the axial anchoring effect, so that the external concrete has good stability and reliability. The bolt uses a trapezoidal threaded rod, and the concrete can enter the trapezoidal threaded groove of the trapezoidal threaded rod during pouring, further improving the anchoring effect.

[0026] 5. The present application can use two channel steels arranged on the left and right sides; or one side can be provided with a channel steel, and the other side can be provided with an H-shaped steel. H-shaped steels can also be arranged on both sides to replace the channel steels. When the structure for connecting the T-shaped node is needed, it can be arranged in the middle between the two thin steel plates, and when the structure for connecting the L-shaped node is needed, it can be arranged on the left side or the right side between the two thin steel plates, replacing the corresponding side channel steel.

[0027] In summary, the present application improves the existing steel concrete composite pipe, improves the pull connection effect between the two thin steel plates, ensures that the thin steel plate does not expand during pouring of the internal concrete, improves the strength of the channel steel, facilitates smooth butt joint between the channel steel and the two thin steel plates, prolongs the length of the bolt, and improves the connection and integration performance of the internal and external concrete. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of a steel concrete composite pipe made by the present application;

[0029] Figure 2 is Figure 1 an enlarged view of A in FIG. 1;

[0030] Figure 3 is Figure 1 an enlarged view of B in FIG. 1;

[0031] Figure 4 is Figure 1 an enlarged view of the bolted tendon in FIG. 1. DETAILED DESCRIPTION

[0032] As shown in FIG. 1, the novel manufacturing process of the steel concrete composite pipe of the present application comprises the following steps, Figures 1-4

[0033] ​(1) According to the design size, process and manufacture thin steel plate 2 and two channel steels 1, the thin steel plate 2 is rectangular, the length of the channel steel 1 and the thin steel plate 2 is equal, and a plurality of bolt nails 4 are arranged on the bottom plate of the channel steel 1 along the length direction;

[0034] (2) Two rectangular thin steel plates 2 are arranged horizontally and correspond to each other up and down, and the interval of the two thin steel plates 2 is fixed;

[0035] (3) A plurality of bolted tendons 3 are vertically drilled into the two thin steel plates 2, and the bolted tendons 3 tightly connect the two thin steel plates 2;

[0036] (4) One channel steel 1 arranged in front and back is horizontally pushed to the left side opening of the two thin steel plates 2, and another channel steel 1 arranged in front and back is horizontally pushed to the right side opening of the two thin steel plates 2;

[0037] (5) The left side of the thin steel plate 2 is welded with the left side channel steel 1, and the right side of the thin steel plate 2 is welded with the right side channel steel 1, to form a rectangular tubular structure with openings at both ends;

[0038] (6) A rectangular cylindrical steel wire mesh 5 is installed outside the rectangular tubular structure, and the outer ends of the bolted tendons 3 and the bolt nails 4 are fixedly connected with the steel wire mesh 5;

[0039] (7) The outside of the rectangular steel pipe structure is poured with concrete, and the steel wire mesh 5 is pre-buried in the external concrete 6.

[0040] The bolt nail 4 in step (1) is a trapezoidal threaded rod, a through hole is formed on the channel steel 1, the trapezoidal threaded rod passes through the through hole and is threadedly connected with the through hole, the inner end of the trapezoidal threaded rod extends into the inside of the rectangular steel pipe structure and is threadedly connected with an inner nut 15, the outer end of the trapezoidal threaded rod is threadedly connected with an outer nut 16, and the outer nut 16 is connected with the steel wire mesh 5 by welding to form an integral body; first, the bolt nail 4 is inserted into the through hole on the channel steel 1 and is fixed by spot welding, and then the inner nut 15 and the outer nut 16 are respectively screwed on the two ends of the bolt nail 4.

[0041] The bolted tendon 3 in step (3) is a drilled conical wire screw rod, the drilled conical wire screw rod is vertically drilled into the two thin steel plates 2 and is threadedly connected with the two thin steel plates 2, the drilled conical wire screw rod includes a rod part and a head part 7 larger than the maximum outer diameter of the rod part, and the head parts 7 of adjacent two drilled conical wire screw rods are located at the front side and the rear side of the rectangular steel pipe structure respectively.

[0042] The rod part is fixedly connected with the head part 7 at one end, and from the other end of the rod part to the head part 7, they are in sequence a drill bit 8, a conical flange segment 9, a threaded tapping segment 10, a smooth rod segment 11 and a straight thread connection segment 12; the steel wire mesh 5 is fixedly connected with the drill bit 8 of each drilled conical wire screw rod by welding.

[0043] The big end diameter of the drill bit 8 is equal to the small end diameter of the conical flanging section 9, the small thread diameter of the thread tapping section 10 is equal to the big end diameter of the conical flanging section 9; the diameter of the smooth rod section 11 is less than or equal to the small thread diameter of the thread tapping section 10; the big thread diameter of the straight thread connecting section 12 is greater than the big thread diameter of the thread tapping section 10; the straight thread connecting section 12 and the thread tapping section 10 of the same drill conical screw rod are respectively thread-connected with the front and rear two thin steel plates 2.

[0044] In step (3), the rotating drilling device clamps the head 7 of the drill conical screw rod to drive the rod part to rotate, and the rotating drilling device is provided with a set below the lower thin steel plate 2 and above the upper thin steel plate 2, and the two sets of rotating drilling devices operate simultaneously, wherein the rotating drilling device above clamps the drill conical screw rod to drill and tap the two thin steel plates 2 from top to bottom, and the specific process is as follows: the drill bit 8 at the lower end of the rod part drills the upper thin steel plate 2 first, then the conical flanging section 9 extrudes the hole wall of the drilled small hole downward to make the hole wall turn downward to the lower surface of the upper thin steel plate 2, the length of the hole is greater than the thickness of the thin steel plate 2, after the conical flanging section 9 turns the hole to extend the length of the hole, the thread tapping section 10 enters the hole (referred to as extruding thread), extrudes the inner thread of the hole wall, until the upper end of the thread tapping section 10 passes through the lower end of the hole, then the smooth rod section 11 passes through the hole with the extruded inner thread, and finally the lower end of the straight thread connecting section 12 starts to be screwed into the hole with the inner thread, at the same time, the drill bit 8 moves downward to drill the lower thin steel plate 2, then the conical flanging section 9 extrudes the hole wall of the drilled small hole of the lower thin steel plate 2 downward to make the hole wall turn downward to the lower surface of the lower thin steel plate 2, the length of the hole is greater than the thickness of the thin steel plate 2, after the conical flanging section 9 turns the hole to extend the length of the hole, the thread tapping section 10 enters the hole, until the distance between the upper end of the head 7 and the upper surface of the upper thin steel plate 2 is equal to the distance between the lower end of the drill bit 8 and the lower surface of the lower thin steel plate 2, and the drilling is stopped, at this time, the thread tapping section 10 is thread-connected with the lower thin steel plate 2, and the straight thread connecting section 12 is thread-connected with the upper thin steel plate 2.

[0045] In step (1), when the channel steel 1 is processed, the open side of the channel steel 1 is relatively bent to form a guide necking structure 13; in step (4), when the channel steel 1 moves to the open side of the two thin steel plates 2, the guide necking structure 13 first enters the inside of the two thin steel plates 2 and guides the whole channel steel 1 to smoothly enter the inside of the open side of the two thin steel plates 2.

[0046] The present application has the following technical effects:

[0047] 1. The tie rod 3 uses a drilled taper threaded rod. This rotary drilling and nailing method connects the two thin steel plates 2, combining the drilling and tie rod insertion processes into one step: drilling, then turning the hole, then extruding the thread, and finally threading. This simplifies the operation and makes construction more convenient and faster. Extending the threaded connection length by turning the hole greatly improves the reliability of the connection between the thin steel plate 2 and the tie rod 3. Half of the drilled taper threaded rods drill from top to bottom, and the other half drill from bottom to top, ensuring a balanced tension force between the two thin steel plates 2 and the threaded connection of the drilled taper threaded rods. The threaded tapping section 10 has a tapping (extruding) function, and both it and the straight thread connection section 12 serve to connect to the drilled hole and tie the two thin steel plates 2.

[0048] 2. The wire mesh 5 is welded to the drill bit 8 of each drilling tapered screw and the outer nut 16 at the outer end of the stud 4, without the need for binding, which improves the reliability of the fixed connection.

[0049] 3. When manufacturing steel-concrete composite pipes in the factory, two thin steel plates 2 are connected into one piece by several tie rods 3. Then, two channel steels 1 are installed between the left and right sides of the two thin steel plates 2. In order to facilitate the movement of the open side of the channel steel 1 between the two thin steel plates 2 and avoid pressure on the thin steel plates 2, a guide narrowing structure 13 is set on the open side of the channel steel 1. This not only ensures the smooth assembly of the channel steel 1 within the allowable error range, but also improves the strength of the channel steel 1 itself.

[0050] 4. The stud 4 is lengthened, with its inner end extending into the rectangular steel tube structure, and an inner nut 15 is installed. After concrete is poured inside the rectangular steel tube structure, the inner nut 15 can improve the axial anchoring effect, giving the outer concrete 6 good stability and reliability. The stud 4 adopts a trapezoidal threaded rod, which allows the concrete to enter the trapezoidal thread groove during pouring, further improving the anchoring effect.

[0051] 5. This invention can employ two channel steels 1 arranged opposite each other on the left and right; alternatively, a channel steel 1 can be arranged on one side and an H-beam on the other. Alternatively, H-beams can be arranged on both sides to replace the channel steel 1. When a structure for connecting T-shaped nodes is required, it can be arranged in the middle between two thin steel plates 2. When a structure for connecting L-shaped nodes is required, it can be arranged on the left or right side between two thin steel plates 2, replacing the channel steel 1 on the corresponding side.

[0052] This embodiment does not impose any limitation on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A novel manufacturing process for steel-concrete composite pipes, characterized by: The method comprises the following steps: (1) according to the design size, processing thin steel plate and two channel steels, the thin steel plate is rectangular, the length of the channel steel and the thin steel plate is equal, and a plurality of bolt nails are arranged on the bottom plate of the channel steel along the length direction; (2) horizontally arranging two rectangular thin steel plates and corresponding them up and down, and fixing the distance between the two thin steel plates; (3) vertically drilling a plurality of bolt bars into the two thin steel plates, and fastening and connecting the two thin steel plates by the bolt bars; (4) horizontally pushing a front and back arranged channel steel to the left opening of the two thin steel plates, and horizontally pushing another front and back arranged channel steel to the right opening of the two thin steel plates; (5) welding the left side of the thin steel plate with the left side of the channel steel, and welding the right side of the thin steel plate with the right side of the channel steel, to form a rectangular tubular structure with open front and back ends; (6) installing a rectangular cylindrical steel wire mesh outside the rectangular tubular structure, and fixing the outer ends of the bolt bars and the bolt nails with the steel wire mesh; (7) pouring concrete outside the rectangular tubular structure, and embedding the steel wire mesh in the external concrete; The bolt bar in step (3) is a drilling conical wire screw, which is vertically drilled into the two thin steel plates and is threadedly connected with the two thin steel plates, and the drilling conical wire screw comprises a rod part and a head part larger than the maximum outer diameter of the rod part, and the heads of adjacent two drilling conical wire screws are located on the upper side and the lower side of the rectangular tubular structure respectively; One end of the rod part is fixedly connected with the head part, and the rod part sequentially comprises a drill bit, a conical flanging section, a threaded tapping section, a smooth rod section and a straight thread connecting section from the other end to the head part; the steel wire mesh is fixedly connected with the drill bit of each drilling conical wire screw by welding; The large end diameter of the drill bit is equal to the small end diameter of the conical flanging section, and the thread small diameter of the threaded tapping section is equal to the large end diameter of the conical flanging section; the diameter of the smooth rod section is less than or equal to the thread small diameter of the threaded tapping section; the thread large diameter of the straight thread connecting section is greater than the thread large diameter of the threaded tapping section; the straight thread connecting section and the threaded tapping section of the same drilling conical wire screw are threadedly connected with the upper and lower two thin steel plates respectively. In step (3), the rotating drilling device clamps the head of the drilling conical screw rod and drives the rod part to rotate. The rotating drilling device is arranged below the lower thin steel plate and above the upper thin steel plate. The two sets of rotating drilling devices operate simultaneously. The specific process of drilling and tapping of the upper thin steel plate by the rotating drilling device from top to bottom is as follows: the drill bit at the lower end of the rod part drills the upper thin steel plate first, then the conical flanging segment extrudes the hole wall of the drilled small hole downward, so that the hole wall is turned downward from the lower surface of the upper thin steel plate. The length of the hole is greater than the thickness of the thin steel plate. After the conical flanging segment extends the length of the hole, the thread tapping segment enters the hole to extrude the internal thread of the hole wall until the upper end of the thread tapping segment passes through the lower end of the hole. Then the smooth rod segment passes through the hole with extruded internal thread. Finally, the lower end of the straight thread connection segment starts to screw into the internal thread hole. At the same time, the drill bit moves downward to drill the lower thin steel plate. Then the conical flanging segment extrudes the hole wall of the drilled small hole of the lower thin steel plate downward, so that the hole wall is turned downward from the lower surface of the lower thin steel plate. The length of the hole is greater than the thickness of the thin steel plate. After the conical flanging segment extends the length of the hole, the thread tapping segment enters the hole until the distance between the upper end of the head and the upper surface of the upper thin steel plate is equal to the distance between the lower end of the drill bit and the lower surface of the lower thin steel plate. Stop drilling. At this time, the thread tapping segment is screw connected with the lower thin steel plate, and the straight thread connection segment is screw connected with the upper thin steel plate.

2. The new fabrication process of steel concrete composite pipe according to claim 1, characterized in that: The stud in step (1) adopts a trapezoidal threaded rod. The channel steel is provided with a left-right through hole. The trapezoidal threaded rod passes through the hole and is screw connected with the hole. The inner end of the trapezoidal threaded rod extends into the rectangular tubular structure and is screw connected with an inner nut. The outer end of the trapezoidal threaded rod is screw connected with an outer nut. The outer nut and the steel wire mesh are connected by welding.

3. The new fabrication process of steel concrete composite pipe according to claim 1, characterized in that: In step (1), when the channel steel is processed, the open side of the channel steel is relatively bent to form a guide necking structure. In step (4), when the channel steel moves to the open side of the two thin steel plates, the guide necking structure first enters the inside of the two thin steel plates and guides the whole channel steel to smoothly enter the inside of the open side of the two thin steel plates.

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