Folding inner mold of precast concrete mold

Abstract

The utility model provides a folding inner mold of a precast concrete mold, which is used for forming a cavity of precast concrete and comprises an inner mold frame and an air bag. The inner mold frame comprises a plurality of mold plates, the adjacent mold plates are hinged, the multiple mold plates form a polygonal outline, an air bag is arranged in the polygonal outline, and the inflated air bag makes contact with part of hinge points or the mold plates and is used for deforming the polygonal outline into a cavity outline; the folding inner mold is formed by hinging the plurality of steel templates, so that the forming precision is high, the rigidity is strong, and the defects that the mold core floats upwards and the thickness of a component is not uniform are avoided; the isolation layer is arranged on the outer side of the inner mold frame, the inner mold frame is prevented from making direct contact with concrete, the steel formwork is not affected by the adsorption force of the concrete, and automatic demolding can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of building material production, in particular to a folding inner mold of a prefabricated concrete mold. Background Art

[0002] Hollow prefabricated components generally require the use of molds, which generally include inner molds and outer molds. The cavity formed by the combination of the inner mold and the outer mold constitutes the casting cavity of the hollow prefabricated component. At present, airbag-shaped inner molds are usually used for production. The airbag mold core is easier to float than the steel mold, and the surface should expand outward after inflation, making the original plane convex. If the tire mesh wire (or tire mesh cloth) of the airbag is unevenly distributed, or the rubber wall thickness is uneven, it is easy to cause partial bulging after the airbag is inflated. In addition, the floating of the rubber core mold will cause uneven thickness of the prefabricated beams and plates. The top plate of the prefabricated beam (plate) is the load-bearing plate for the vehicle load on the bridge deck. If the thickness is uneven, it will affect the life of the bridge and even the travel safety of the vehicle; in addition, the airbag is in direct contact with the concrete, and the demoulding time needs to be strictly controlled, otherwise it will cause tearing and damage to the surface of the airbag; the airbag is in the high temperature and high humidity environment required for the steam curing of prefabricated components for a long time, and the material is easy to age, and the reuse rate is low compared to the steel inner mold. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a foldable inner mold of a precast concrete mold. The inner mold frame is formed by a plurality of mutually hinged mold plates. The inner mold frame has high molding precision and strong rigidity. An isolation layer is provided on the outer side of the inner mold frame to prevent the inner mold frame from directly contacting the concrete, so that the inner mold frame is not affected by the adsorption force of the concrete during demoulding. The airbag is placed on the inner side of the mold frame, and the airbag will not contact the concrete, and will not cause surface tearing, etc. The reuse rate and service life can be guaranteed.

[0004] The utility model achieves the above technical purpose through the following technical means.

[0005] A folding inner mold of a precast concrete mold, used for forming a cavity of precast concrete, comprises an inner mold frame and an air bag;

[0006] The inner mold frame includes a plurality of templates, adjacent templates are hinged, and the plurality of templates form a polygonal outline. An airbag is arranged in the polygonal outline. The inflated airbag contacts part of the hinge points or the templates to deform the polygonal outline into a cavity outline.

[0007] Furthermore, a reset device is provided at the hinge between adjacent templates to generate a pre-tightening force for the contraction and reset of the inner mold frame.

[0008] Furthermore, the reset device is a torsion spring, which generates a pre-torque between adjacent templates, and utilizes the pre-torque to shrink the inner mold frame.

[0009] Furthermore, an isolation layer is provided on the surface of the template of the polygonal profile, for isolating the concrete from the polygonal profile.

[0010] Furthermore, each hinge point is provided with a limiting device, which is used to form the polygonal contour into a cavity contour by limiting the rotation angle of the adjacent templates.

[0011] Furthermore, the limiting device is a limiting block, and each hinge point is provided with at least one limiting block for limiting the rotation angle of the adjacent templates.

[0012] Furthermore, the limiting device includes a plurality of inner templates, adjacent hinge points are connected by inner templates, the plurality of inner templates constitute a polygonal inner contour located inside the polygonal contour, the inner template of the polygonal inner contour shares a hinge point with the template of the polygonal contour, and the polygonal inner contour is used to limit the rotation angle of the template of the polygonal contour.

[0013] Furthermore, the inflated airbag deforms the polygonal outline into a triangular cavity outline; each side of the triangular cavity outline is composed of two mutually hinged templates; the triangular cavity outline includes a vertex hinge point and an edge hinge point; the vertex hinge point is located at the vertex of the triangular cavity outline, and the edge hinge point is located at the edge of the triangular cavity outline; the airbag during the expansion process contacts the edge hinge point.

[0014] Furthermore, the cavity profile is a right triangle, the side hinge point of one hypotenuse is located at the midpoint of the hypotenuse of the right triangle, and the side hinge points of the two straight sides are close to the right angle.

[0015] Furthermore, arc transitions are provided at corners of the inner mold frame.

[0016] The beneficial effects of the utility model are:

[0017] 1. The folding inner mold of the precast concrete mold described in the utility model adopts a folding inner mold frame composed of a plurality of hinged steel molds, which has high molding accuracy and strong rigidity, and will not have defects such as floating of the mold core and uneven thickness of the components.

[0018] 2. The foldable inner mold of the precast concrete mold described in the utility model is provided with an air bag in the foldable inner mold frame, and the expansion of the inner mold frame is achieved by controlling the expansion of the air bag, thereby realizing mold loading and demoulding operations, and has a simple structure and is easy to install and use.

[0019] 3. The foldable inner mold of the precast concrete mold described in the utility model is simple to manufacture and has low cost by providing a circular airbag. The airbag is built into the foldable inner mold frame and does not directly contact the concrete. It has a high reuse rate and a long service life.

[0020] 4. The foldable inner mold of the precast concrete mold described in the utility model is provided with an isolation layer on the outer side of the inner mold frame, so that the inner mold frame does not directly contact with the concrete and is not affected by the adsorption force of the concrete during demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the utility model. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the folded inner mold of the triangular single mold plate of the utility model in a contracted state;

[0023] Figure 2 This is a schematic diagram of the triangular single template in the utility model with the inner mold folded and extended;

[0024] Figure 3 This is a schematic diagram of the folded inner mold of the triangular double mold plate of the utility model in a contracted state;

[0025] Figure 4 This is a schematic diagram of the triangular double-template plate folding inner mold extension state of the utility model;

[0026] In the figure:

[0027] 1-inner mold frame, 2-template, 3-airbag, 4-inner template. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] A folding inner mold of a precast concrete mold is used to form a cavity of precast concrete, including an inner mold frame 1 and an air bag 3. The inner mold frame 1 includes a plurality of templates 2, which are hinged between adjacent templates 2, and the plurality of templates 2 form a polygonal outline. An air bag 3 is arranged in the polygonal outline. The inflated air bag 3 contacts part of the hinge point or the template 2. As the air bag 3 inflates, the force acting on the hinge point or the template 2 becomes greater and greater, and the polygonal outline gradually transforms into a cavity outline. The template 2 is a steel template. The folding inner mold formed by the steel template and the hinge seat has high molding accuracy and strong rigidity, and will not have defects such as core floating and uneven component thickness. The inner mold frame 1 adopts arc transition connection at the corners to effectively avoid the occurrence of problems during the working process. In order to prevent the inner mold or the outer mold from being damaged due to collision, each of the hinge points is provided with at least one limiting device, which is a limiting block. During the inflation process of the airbag 3, the inner mold frame 1 gradually expands outward into a cavity shape. When the inner mold frame 1 expands into a cavity shape, the limiting device restricts the template 2 from rotating, and the inner mold frame 1 maintains the current molding shape; a reset device is also provided at the hinge of the adjacent templates 2, and the reset device is a torsion spring, which generates a pre-torque between the adjacent templates 2, and utilizes the pre-torque to shrink the inner mold frame 1; when demolding, the airbag 3 shrinks, the supporting force on the inner mold frame 1 is reduced, and under the action of the deadweight of the template 2 and the pre-torque generated by the torsion spring, the inner mold frame 1 shrinks and resets.

[0032] Figure 1 and Figure 2 The triangular single template folded inner mold shown in FIG. 1 is in the initial state of the triangular inner mold. Figure 1 As shown in the figure, AE, EB, BF, FC, CD and DA are six templates 2 constituting the inner mold, and the connection mode between adjacent templates 2 is hinged; template AE and template EB are hinged to form the AB side of the triangle, template BF and template FC are hinged to form the BC side of the triangle, template CD and template DA are hinged to form the CA side of the triangle, and the triangular inner mold in the initial state is in a contracted state, ∠AEB, ∠BFC and ∠ADC are all obtuse angles; the airbag 3 is continuously inflated, and the airbag 3 gradually expands. The surface of the inflated airbag 3 contacts the hinge points D, E, and F and provides support force to the hinge points D, E, and F to gradually open the mold frame 1 outward, so that the inner mold frame 1 expands outward to form a plane. The inner mold frame 1 after molding is as shown in Figure 2As shown, ∠AEB, ∠BFC and ∠ADC are all straight angles, and the AB side, BC side and AC side are all straight sides. Limiting devices are provided at the hinge points D, E and F. Taking the hinge point E as an example, the airbag 3 supports the hinge point E to support the template AE and the template BE outward. When the template AE and the template BE form a straight AB side, under the action of the limiting device provided at the hinge point E, even if the airbag 3 is continuously inflated, the airbag 3 cannot make the hinge point E continue to support the AB side of the inner mold frame 1 outward. Similarly, when the template AD and the template DC form the hypotenuse AC of the triangle, and the template BF and the template FC form the vertical BC side, the limiting devices located at the hinge point F and the hinge point D will keep the BC side and the AC side in a straight state, and cannot continue to expand outward.

[0033] In addition, a reset device is provided between adjacent hinge points of adjacent templates 2. In the utility model, the reset device is a torsion spring. During the expansion process of the inner mold frame 1, the airbag 3 overcomes the preload force of the reset device so that the reset device is continuously stretched. When the inner mold frame 1 is fully expanded and formed, a casting cavity is formed between the inner mold frame 1 and the outer mold, and concrete is filled into the casting cavity. When the cast concrete component reaches the strength requirement, demolding is performed to discharge the gas in the airbag 3, gradually reduce the internal pressure of the airbag 3, shrink the airbag 3, and gradually reduce the support force of the hinge points D, E, and F by the airbag 3. The inner mold frame 1 shrinks and resets under the action of its own gravity and the preload force generated by the reset device, gradually shrinks to the initial state, and completes demolding.

[0034] In actual use, when casting prefabricated components, when the mold adopts the above-mentioned inner mold, the inner mold frame 1 and the outer mold form a casting cavity for the prefabricated component, and the airbag 3 is located on the inner side of the inner mold frame 1 to support the inner mold frame 1 to expand to the required inner mold size. Compared with the traditional inner mold that only uses airbags, the inner mold frame 1 made of a rigid mold plate ensures the rigid support of the inner mold, which can prevent the center offset and uncontrollable deformation of the airbag 3, thereby making the material of the cavity between the inner mold and the outer mold more uniform, ensuring the uniformity of the inner wall thickness distribution of the prefabricated component, improving the load resistance of the prefabricated component, and greatly improving the production quality of the prefabricated component; The bag 3 is located on the inner side of the mold frame 1, which effectively avoids the phenomenon of direct contact between the concrete slurry and the bag 3, minimizes the wear of the bag 3, and extends the service life of the bag 3. In addition, a plastic film is arranged outside the inner mold frame 1 as an isolation layer, so that the inner mold frame 1 does not directly contact with the concrete, and is not affected by the adsorption force of the concrete during demoulding. After the precast concrete component reaches the strength requirement, the bag 3 shrinks, and the inner mold frame 1 loses the support of the bag 3. Under the action of the preload force of the reset device, the inner mold frame 1 shrinks to the initial state, and the inner mold frame 1 is automatically separated from the concrete component, which is more convenient for demoulding.

[0035] The inner mold frame 1 can also be a contour of other shapes composed of a number of templates 2. Similar to the above-mentioned inner mold frame 1, adjacent templates 2 are hinged, and a reset device is provided between the hinge points of adjacent templates 2. The reset device is a torsion spring. The initial state of the torsion spring is a contracted state. In the initial state, each side of the inner mold frame 1 contracts toward the inside of the contour. An airbag 3 is provided inside the inner mold frame 1. The airbag 3 can expand and contract radially. The expanded airbag 3 contacts part of the hinge seat or template 2. During the continuous expansion of the airbag 3, the airbag 3 gradually expands the inner mold frame 1, so that the inner mold frame 1 is deformed into a cavity contour. A limiting device is provided at each of the hinge points. When the adjacent templates of the inner mold frame 1 are extended to the straight edge under the support of the airbag 3, the polygonal mold frame cannot be closed under the action of the limiting device. Continue to expand. During the expansion process of the airbag 3, the hinge point or template 2 in contact with the airbag 3 is supported by the airbag 3 more and more, and the reset device is gradually stretched until all sides of the polygonal mold frame are expanded into straight sides; when the polygonal mold frame is formed, concrete is injected into the casting cavity formed by the inner mold frame 1 and the outer mold. After the strength of the precast concrete component reaches the requirement, it is demoulded and the gas in the airbag 3 is discharged. During the exhaust process, the internal pressure of the airbag 3 is reduced, and the support force of the airbag 3 on the hinge point or template 2 in contact with the airbag 3 is gradually reduced. The reset device gradually shrinks under the action of the preload force, so that the polygonal mold frame gradually shrinks and returns to the initial contracted state, thereby realizing demoulding; in addition, a plastic film is also provided on the outside of the template 2 constituting the polygonal mold frame as an isolation layer to isolate the concrete from the polygonal contour.

[0036] like Figure 3 and Figure 4 The triangular double-template folding inner mold shown in the figure has a plurality of inner templates 4 added to the triangular single-template folding inner mold, and the adjacent inner templates 4 are hinged, and the plurality of inner templates 4 constitute a triangular inner contour located inside the triangular contour, and the inner templates 4 of the triangular inner contour share a hinge point with the template 2 of the triangular contour, and the inner templates 4 constituting the triangular inner contour play a limiting role, and are used to limit the rotation angle of the template 2 of the triangular contour, and when the outer contour of the triangle is deformed into a cavity contour, the inner template 4 limits the template 2 from rotating, and the inner mold frame 1 maintains the current cavity contour.

[0037] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0038] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the protection scope of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A folding inner mold of a precast concrete mold, used for forming a cavity of precast concrete, characterized in that: It comprises an inner mold frame (1) and an air bag (3); The inner mold frame (1) comprises a plurality of mold plates (2), adjacent mold plates (2) are hinged, and the plurality of mold plates (2) form a polygonal outline. An air bag (3) is provided in the polygonal outline. The expanded air bag (3) contacts part of the hinge points or the mold plates (2) to deform the polygonal outline into a cavity outline.

2. The foldable inner mold of the precast concrete mold according to claim 1 is characterized in that: A resetting device is arranged at the hinge between adjacent templates (2) to generate a pre-tightening force for the contraction and resetting of the inner mold frame (1).

3. The foldable inner mold of the precast concrete mold according to claim 2 is characterized in that: The reset device is a torsion spring, which generates a pre-torque between adjacent templates (2), and utilizes the pre-torque to shrink the inner mold frame (1).

4. The foldable inner mold of the precast concrete mold according to claim 2 is characterized in that: An isolation layer is provided on the surface of the template (2) with the polygonal profile, for isolating the concrete from the polygonal profile.

5. The foldable inner mold of the precast concrete mold according to claim 1 is characterized in that: Each hinge point is provided with a limiting device, which is used to shape the polygonal contour into a cavity contour by limiting the rotation angle of the adjacent template (2).

6. The foldable inner mold of the precast concrete mold according to claim 5, characterized in that: The limiting device is a limiting block, and each hinge point is provided with at least one limiting block for limiting the rotation angle of the adjacent template (2).

7. The foldable inner mold of the precast concrete mold according to claim 5, characterized in that: The limiting device comprises a plurality of inner templates (4), adjacent hinge points are connected by the inner templates (4), the plurality of inner templates (4) form a polygonal inner contour located inside the polygonal contour, the inner template (4) of the polygonal inner contour shares a hinge point with the template (2) of the polygonal contour, and the polygonal inner contour is used to limit the rotation angle of the template (2) of the polygonal contour.

8. The foldable inner mold of the precast concrete mold according to claim 1, characterized in that: The inflated airbag (3) deforms the polygonal outline into a triangular cavity outline; each side of the triangular cavity outline is composed of two mutually hinged templates (2); the triangular cavity outline includes a vertex hinge point and an edge hinge point; the vertex hinge point is located at the vertex of the triangular cavity outline, and the edge hinge point is located at the edge of the triangular cavity outline; the airbag (3) during the expansion process contacts the edge hinge point.

9. The foldable inner mold of the precast concrete mold according to claim 8, characterized in that: The cavity profile is a right triangle, the side hinge point of one hypotenuse is located at the midpoint of the hypotenuse of the right triangle, and the side hinge points of the two straight sides are close to the right angle.

10. The foldable inner mold of the precast concrete mold according to claim 1, characterized in that: The inner mold frame (1) is provided with an arc transition at a corner.

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