CN213946871U - Core mould and concrete prefabricated hollow component forming structure adopting same - Google Patents

Abstract

The utility model relates to a precast concrete is mandrel for hollow component, including the mandrel body, the mandrel body includes the steel mould and sets up the flexible membrane cover of round outside the steel mould periphery, and the longitudinal length of flexible membrane cover and steel mould equals, the steel mould is hollow structure's pipe fitting, is equipped with the drag hook on its one end, and flexible membrane cover is rolled up curved messenger both sides limit overlap joint by a flexible membrane and is formed. The core mould body of the utility model is divided into two independent parts of an internal steel mould and an external flexible membrane sleeve, and the existence of the external flexible membrane sleeve avoids the defect that the conventional internal steel mould can not be drawn out due to the existence of concrete bonding force; the concrete prefabricated hollow component forming structure of the core mould is adopted, the quality of a finished product is improved, and the application range of the concrete prefabricated hollow component in an assembly type building is enlarged.

Description

Core mould and concrete prefabricated hollow component forming structure adopting same

Technical Field

The utility model belongs to the technical field of the precast concrete hollow component technique and specifically relates to a core mould and adopt the precast concrete hollow component shaping structure of this core mould and belongs to civil engineering construction field.

Background

In the casting process of the common prefabricated components in the civil engineering construction field, such as the precast concrete hollow slab, the slab beam, the box beam and the like, an inflatable rubber core mold is often used. The inflatable rubber core mold is easy to shift and float in the pouring process, the in-place fixation in the mold plate is complicated, the production efficiency is low, and the inflatable rubber is easy to age and deform.

The common steel pipe core mold has high strength and rigidity, can be directly fixed on the end molds at two ends, is convenient to take in place and cannot shift, and can be drawn out to form a hole after pouring. However, the conventional steel pipe core mold is only suitable for the prefabricated hollow slab with the aperture smaller than 100mm, and the prefabricated slab with the aperture larger than 100mm is difficult to draw the steel pipe core mold: firstly, before the initial setting of the concrete, the strength is not enough, and the early core pulling causes the concrete to collapse easily, thereby influencing the quality of the finished member product; secondly, after the concrete is finally set, the strength is enough, and the core die cannot be pulled out due to the existing adhesive force between the concrete and the core die caused by the late core pulling.

Therefore, the large-hole hollow precast slabs on the market are mainly produced by a pushing and extruding forming machine, and the defects of the production mode are as follows: the forming machine walks linearly, prestressed reinforcements in the hollow slab cannot be arranged in a broken line manner, and transverse reinforcements cannot be placed; the forming machine continuously spreads concrete on the long-line pedestal, and cannot reserve the beard ribs at the plate ends. These product defects bring great limitations to the application of precast slabs, resulting in the small amount of such precast concrete hollow members currently on the market.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a technical problem who solves is: overcomes the defects in the prior art and provides a core mould for a concrete prefabricated hollow component.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a precast concrete is mandrel for hollow component, includes the mandrel body, the mandrel body includes the steel mould and sets up the flexible membrane cover of round outside the steel mould periphery, the longitudinal length of flexible membrane cover and steel mould equals, the steel mould is hollow structure's pipe fitting, is equipped with the drag hook on its one end, flexible membrane cover is rolled up by a flexible membrane and is bent messenger both sides limit overlap joint and form.

The utility model discloses a mandrel body falls into two independent parts of inside steel mould and outside flexible membrane cover, and the existence of outside flexible membrane cover has just avoided the shortcoming that conventional inside steel mould can't be taken out because of the existence of concrete adhesion.

Further defined, the flexible membrane sleeve has a closed cell structure comprised of a plurality of mutually independent gas bubbles.

The flexible membrane sleeve has a closed-cell structure, so that the flexible membrane sleeve cannot be adhered to the outer wall of the steel membrane, the friction force between the steel mould and the flexible membrane sleeve is reduced, and dirt and dust are not easily adhered to the inner side wall of the flexible membrane sleeve.

Further, the outer wall of the steel die is coated with an oil layer. Further reducing the friction between the steel die and the flexible film sleeve.

In order to facilitate the installation and the connection firmness of the draw hook, the draw hook is further limited, the draw hook is U-shaped, and two ends of the draw hook extend into the steel die and are welded and connected with the inner wall of the steel die.

For the convenience of operation, the lap joint of the flexible film sleeve is further defined to be bonded by glue or double-sided adhesive tape or adhesive tape paper.

In order to ensure the connection firmness of the flexible film sleeve, the overlapping length of the flexible film sleeve is further limited to be 10-20 mm.

Further, the flexible film is made of EPE pearl cotton foamed film or PE bubble film, and the thickness of the flexible film is 1-5 mm. The EPE pearl cotton foamed film or the PE bubble film has the characteristics of water resistance, moisture resistance, shock resistance, good plasticity, strong toughness and the like.

The internal steel die is further limited according to the shape requirement of the component core hole, and the steel die is a round tube, a flat round tube, an oval tube or a square tube.

The utility model discloses another technical problem who solves is: overcomes the defects in the prior art and provides a concrete prefabricated hollow member.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides an adopt precast concrete hollow component shaping structure of mandrel in above-mentioned scheme, includes die block, side forms, upper end mould and lower extreme mould, the die block is close to both sides limit department and is equipped with a side forms respectively, and the both ends head of die block is equipped with the lower extreme mould, the mandrel body is placed on the lower extreme mould, the upper end mould has been placed to the top of mandrel body, and the pouring has the concrete in the region that mandrel body outside is enclosed by die block, both sides mould and upper and lower extreme mould, by supreme reinforcing bar and the steel strand wires of length direction of presetting in proper order down in the concrete of being close to die block department, and the length of steel strand wires is greater than the length of die block.

After concrete is poured, due to the existence of the flexible film sleeve, water and moisture can be prevented, the concrete is separated from the internal steel die, and the concrete is prevented from being adsorbed and bonded on the steel die; in the process of the concrete drying shrinkage, the excessive bond stress of the concrete to the internal steel die is avoided by depending on the plasticity of the flexible film sleeve; the friction force between the internal steel die and the concrete member is ensured to be small, so that the internal steel die is convenient to draw out; the finished product quality of the concrete prefabricated hollow component is ensured, and the application range of the concrete prefabricated hollow component in the fabricated building is enlarged.

The utility model has the advantages that: the core mould body of the utility model is divided into two independent parts of an internal steel mould and an external flexible membrane sleeve, and the existence of the external flexible membrane sleeve avoids the defect that the conventional internal steel mould can not be drawn out due to the existence of concrete bonding force; the concrete prefabricated hollow component formed by adopting the forming structure of the core mould has the advantages that the quality of a finished product is improved, and the application range of the concrete prefabricated hollow component in an assembly type building is enlarged.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic structural view of the core mold of the present invention.

Fig. 2 is a sectional view in the direction a-a of fig. 1.

Fig. 3 is the schematic structural diagram of the hollow member forming structure for concrete prefabrication of the utility model.

Fig. 4 is a side view of the concrete prefabricated hollow member after molding of fig. 3.

Fig. 5 is a plan view of the concrete precast hollow member after molding of fig. 3.

In the figure: 1. the steel wire drawing die comprises a core die body, 11 steel dies, 12 flexible film sleeves, 13 drag hooks, 2 bottom dies, 3 side dies, 4 upper end dies, 5 lower end dies, 6 steel bars and 7 steel strands.

Detailed Description

The invention will now be further described with reference to the accompanying drawings. The drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1 and 2, a core mold for a concrete prefabricated hollow member comprises a core mold body 1, wherein the core mold body 1 comprises a steel mold 11 and a circle of flexible film sleeve 12 arranged outside the periphery of the steel mold 11, the width of the flexible film sleeve 12 is 20mm larger than the periphery of the steel mold, two side edges are lapped by 10mm through bending of a flexible film, the flexible film sleeve is sleeved on the steel mold 11, the longitudinal lengths of the steel film 11 and the flexible film sleeve 12 are equal, the steel mold 11 is a hollow pipe fitting, one end of the steel mold is provided with a draw hook 13, the flexible film sleeve 12 has a closed hole structure, and the closed hole structure is formed by a plurality of mutually independent bubbles.

In the embodiment, the flexible film is made of an EPE pearl cotton foamed film or a PE bubble film, and has the characteristics of water resistance, moisture resistance, shock resistance, good plasticity, strong toughness and the like; the thickness of the flexible film sleeve is 1-5 mm, and the strength of the flexible film sleeve is guaranteed.

In order to further reduce the friction between the steel die 11 and the flexible film sleeve 12, an oil layer is coated on the outer wall of the steel die 11. The draw hook 13 is U-shaped, and two ends of the draw hook extend into the steel die 11 and are welded with the inner wall of the steel die 11. The overlapping portion (I in fig. 2) of the flexible film sleeve 12 is bonded by glue, or may be bonded by double-sided tape or adhesive tape paper. Preferably the flexible film sleeve 12 has an overlap length of 10 mm.

The steel die 11 can be a circular tube, a flat circular tube, an elliptical tube or a square tube according to the shape requirement of the core hole of the component, and can also be made into other structures.

As shown in fig. 3, a structure for forming a concrete prefabricated hollow member using the core mold in the above embodiment includes a bottom mold 2, side molds 3, an upper end mold 4 and a lower end mold 5, the side molds 3 are respectively disposed at positions of the bottom mold 2 near two side edges, the lower end mold 5 is disposed at two ends of the bottom mold 2, the core mold body 1 is placed on the lower end mold 5, the upper end mold 4 is placed above the core mold body 1, concrete is poured into an area surrounded by the bottom mold 2, the two side molds 3, the upper end mold 4 and the lower end mold 5 outside the core mold body 1, a steel bar 6 in a width direction and a steel strand 7 in a length direction are sequentially pre-disposed in the concrete near the bottom mold 2 from bottom to top, and the length of the steel strand 7 is greater than the length of the bottom mold 2.

The steps of adopting the molding structure to mold the concrete prefabricated hollow component are as follows: the bottom die 2 is put in place, 2 side dies 3 are placed, the lower end die 5 is placed, the core die body 1 is hoisted and placed in the lower end die 5 in place, the upper end die 4 is placed, all the die plates are locked, and the core die body 1 is ensured to be fixed; pouring concrete; according to different apertures, when the concrete reaches 0.2-0.6 times of the design strength, pulling the core mold body 1 to separate the inner steel mold 11 from the flexible film sleeve 12, and leaving the flexible film sleeve 12 in the concrete member; and when the strength of the concrete reaches 0.8 times of the designed strength, releasing the steel stranded wires 7, removing all the templates, hoisting the precast concrete member, and demolding, as shown in fig. 4 and 5.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable people skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (9)

1. The utility model provides a precast concrete is mandrel for hollow component, includes the mandrel body, its characterized in that: the core mould body comprises a steel mould and a circle of flexible membrane sleeve arranged outside the periphery of the steel mould, the longitudinal length of the flexible membrane sleeve is equal to that of the steel mould, the steel mould is a pipe fitting with a hollow structure, a drag hook is arranged at one end of the steel mould, and the flexible membrane sleeve is formed by rolling and bending a flexible membrane to enable two side edges to be lapped.

2. The core mold for a concrete precast hollow member according to claim 1, characterized in that: the flexible membrane has a closed cell structure comprised of a plurality of mutually independent bubbles.

3. The core mold for a concrete precast hollow member according to claim 1, characterized in that: and an oil layer is coated on the outer wall of the steel die.

4. The core mold for a concrete precast hollow member according to claim 1, characterized in that: the draw hook is U-shaped, and two ends of the draw hook extend into the steel mould and are welded with the inner wall of the steel mould.

5. The core mold for a concrete precast hollow member according to claim 1, characterized in that: the lap joint of the flexible film sleeve is bonded by glue or double-sided adhesive tape or adhesive tape paper.

6. The core mold for a concrete precast hollow member according to claim 5, characterized in that: the lapping length of the flexible film sleeve is 10-20 mm.

7. The core mold for a concrete precast hollow member according to claim 1, characterized in that: the flexible film is made of EPE pearl cotton foamed film or PE bubble film, and the thickness of the flexible film is 1-5 mm.

8. The core mold for a concrete precast hollow member according to claim 1, characterized in that: the steel die is a round tube, a flat round tube, an elliptical tube or a square tube.

9. A concrete prefabricated hollow member molding structure using the core mold according to claim 1, wherein: including die block, side forms, upper end mould and lower extreme mould, the die block is close to both sides limit department and is equipped with a side forms respectively, and the both ends head of die block is equipped with the lower extreme mould, the mandrel body is placed on the lower extreme mould, the upper end mould has been placed to the top of mandrel body, and the pouring has the concrete in the region that mandrel body outside is enclosed by die block, both sides mould and upper and lower extreme mould, by supreme reinforcing bar and the steel strand wires of length direction of presetting width direction in proper order down in the concrete that is close to die block department, and the length of steel strand wires is greater than the length of die block.

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