Pre-tensioning method plate girder forming die
By using a split design of the left and right inner molds and a linkage mechanism, combined with a combined power system of a crane and a winch, the problems of high resistance and high energy consumption in the traditional inner mold demolding process are solved, achieving efficient and low-damage inner mold demolding, improving production efficiency and reducing costs.
Patent Information
- Application Number
- CN202520636486.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-03-17
- Estimated Expiration
- 2035-04-07
AI Technical Summary
In the process of demolding the inner mold of traditional pre-tensioned slab beam forming mold, there are problems such as high demolding resistance, high energy consumption, and easy damage to the finished product.
The design adopts a split design with a left inner mold and a right inner mold, combined with a linkage mechanism and an auxiliary demolding device. The linkage mechanism supports and contracts between the inner molds, and the combined power system of the gantry crane and the winch is used to demold the inner molds synchronously, reducing friction and frictional resistance.
It improves demolding efficiency, reduces damage to finished products, lowers energy consumption, increases production efficiency, and saves costs.
Smart Images
Figure CN223998692U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the inner circular mold of the pre-tensioned plate beam forming mold and its demolding treatment technology, specifically to a pre-tensioned plate beam forming mold. Background Technology
[0002] In the production of precast concrete slab beams, the pre-tensioning process is widely used due to its high efficiency and economy. Pre-tensioning slab beam forming machines typically consist of an axially horizontally positioned outer mold and an inner mold placed inside it. Concrete is poured between the inner and outer molds to form the beam. After the concrete has formed, demolding the inner mold becomes a crucial step in slab beam production. Traditional demolding methods mainly rely on power mechanisms such as winches to directly pull the inner mold. However, due to the significant sliding friction between the inner steel mold and the formed concrete, relying solely on power mechanisms often results in high demolding resistance, high energy consumption, and potential damage to the finished slab beam, affecting production efficiency and product quality. Summary of the Invention
[0003] This utility model proposes a pre-tensioned slab beam forming mold. The inner mold adopts a split design with a left inner mold and a right inner mold. The contact surface of the left inner mold and the right inner mold is a slope. The left inner mold is composed of a first inner mold and a second inner mold, and the right inner mold is composed of a third inner mold and a fourth inner mold. The mold is supported and contracted between the first inner mold and the second inner mold and between the third inner mold and the fourth inner mold through a linkage mechanism (first support component and second support component). This can improve the demolding efficiency and reduce the damage to the formed concrete during demolding, thereby improving production efficiency and reducing damage to the finished product.
[0004] The technical solution disclosed in this utility model is as follows: A pre-tensioned plate beam forming mold includes an outer mold and an inner mold. The inner mold includes a left inner mold and a right inner mold. The left inner mold and the right inner mold together form a circular inner mold. The left inner mold includes a first inner mold and a second inner mold. In the circumferential direction, one end of the first inner mold and the second inner mold are hinged, and the other end is connected through a first support component. The right inner mold includes a third inner mold and a fourth inner mold. In the circumferential direction, one end of the third inner mold and the fourth inner mold are hinged, and the other end is connected through a second support component. When the inner mold is demolded, the first support component or the second support component is pulled by a demolding device to demold.
[0005] Based on the above scheme, as a preferred embodiment, the first inner mold and the second inner mold are hinged together by a plurality of first hinges. A first fixing plate is fixedly installed on the inner wall of the first inner mold. One end of the first connecting arm is rotatably connected to the first fixing plate, and the other end is rotatably connected to the first pivot. A second fixing plate is fixedly installed on the inner wall of the second inner mold. One end of the second connecting arm is rotatably connected to the second fixing plate, and the other end is rotatably connected to the pivot. A first channel steel is also rotatably connected to the pivot. The second connecting arm is located between the first channel steel and the first connecting arm. A ring buckle is fixedly installed at the end of the first channel steel.
[0006] The right inner mold includes a third inner mold and a fourth inner mold. The third inner mold and the fourth inner mold are hinged together by several hinges. A third fixing plate is fixedly installed on the inner wall of the third inner mold. One end of the third connecting arm is rotatably connected to the third fixing plate, and the other end is rotatably connected to the second pivot. A fourth fixing plate is fixedly installed on the inner wall of the fourth inner mold. One end of the fourth connecting arm is rotatably connected to the fourth fixing plate, and the other end is rotatably connected to the second pivot. A second channel steel is also rotatably connected to the second pivot. The third connecting arm is located between the second channel steel and the fourth connecting arm. The end of the second channel steel is fixedly installed with the aforementioned ring buckle.
[0007] Based on the above scheme, as a preferred embodiment, the demolding device includes a power mechanism for pulling out the inner mold and an auxiliary demolding device that applies an upward force to the inner mold during the process of pulling out the inner mold, the auxiliary demolding device moving synchronously with the inner mold.
[0008] Based on the above scheme, as a preferred option, the power mechanism is a winch, and the wire rope of the winch is connected to the ring buckle on the first channel steel or the second channel steel through a connecting buckle.
[0009] Based on the above scheme, as a preferred option, the ring buckle is a U-shaped steel, with both ends of the U-shaped steel fixed to the corresponding first channel steel and second channel steel, and the connecting buckle is a U-shaped rod, with both ends of the U-shaped rod being detachably fixedly connected by a connecting rod.
[0010] Based on the above scheme, as a preferred option, the wire rope and the connecting buckle are connected by a ring buckle.
[0011] Based on the above scheme, as a preferred option, the auxiliary demolding device is a crane installed at the top of the workshop, with the crane's hook connected to the front end of the left or right inner mold.
[0012] Based on the above scheme, as a preferred option, the front end faces of the left inner mold and the right inner mold have holes, and the hooks are hooked into the holes.
[0013] Based on the above scheme, as a preferred option, several reinforcing plates are fixedly installed on the inner walls of both the first inner mold and the second inner mold.
[0014] Based on the above scheme, as a preferred option, the contact surfaces of the left inner mold and the right inner mold are sloped surfaces.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] The circular inner mold adopts a split design with a left inner mold and a right inner mold, and the contact surface of the left inner mold and the right inner mold is a slope. The left inner mold is composed of a first inner mold and a second inner mold, and the right inner mold is composed of a third inner mold and a fourth inner mold. The linkage mechanism (first support component and second support component) provides support and contraction between the first inner mold and the second inner mold, as well as between the third inner mold and the fourth inner mold, which can improve the demolding efficiency and reduce the damage to the molded concrete during demolding.
[0017] By applying an upward force to the inner mold through the auxiliary demolding device, the sliding friction can be reduced. The auxiliary demolding device moves synchronously with the inner mold, ensuring that an upward force is always applied to the inner mold during the pulling-out process, reducing friction and making it easier for the winch to pull out the inner mold.
[0018] The reduced friction between the inner mold and the formed concrete product during the process prevents damage to the product.
[0019] Using a crane to hold the front end of the inner mold can prevent it from hitting the ground during the pulling-out process and thus avoid damage.
[0020] The overhead crane is an essential tool for the normal operation of the workshop, eliminating the need for additional auxiliary equipment for demolding and saving costs. Attached Figure Description
[0021] Figure 1 This is a system block diagram of the present invention;
[0022] Figure 2 This is a schematic diagram of the circular inner mold of this utility model;
[0023] Figure 3 This is a diagram of the internal structure of the circular inner mold in this utility model;
[0024] Figure 4 This is a structural diagram of the fixing buckle;
[0025] Figure 5 This is a schematic diagram of the ring buckle structure;
[0026] Figure 6 This is a schematic diagram showing the connection between the buckle and the wire rope. Detailed Implementation
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.
[0028] like Figure 1-6As shown, a pre-tensioned slab beam forming mold includes an outer mold 26, an end plate 27, and an inner mold. There are two outer molds and two end plates. The inner mold is supported by a support frame (stallion) on the base plate. The two outer molds are located on both sides of the inner mold and are fixedly connected to the two end plates at both ends. The two ends of the inner mold pass through the end plates and are sealed to the end plates. The end plates are sealed to the two outer molds and the base plate.
[0029] The inner mold includes a left inner mold and a right inner mold. The left inner mold and the right inner mold together form a circular inner mold. The left inner mold includes a first inner mold 1 and a second inner mold 2. In the circumferential direction, one end of the first inner mold and the second inner mold are hinged together, and the other end is connected through a first support component. The right inner mold includes a third inner mold 3 and a fourth inner mold 4. In the circumferential direction, one end of the third inner mold and the fourth inner mold are hinged together, and the other end is connected through a second support component. When the inner mold is demolded, the first support component or the second support component is pulled by a demolding device to demold.
[0030] The first inner mold and the second inner mold are hinged together by several first hinges 5. The first support assembly includes a first fixed plate 6, a first connecting arm 7, a first pivot 8, a second connecting arm 9, and a second fixed plate 10. The first fixed plate is fixedly installed on the inner wall of the first inner mold. One end of the first connecting arm is rotatably connected to the first fixed plate, and the other end is rotatably connected to the first pivot. The second fixed plate is fixedly installed on the inner wall of the second inner mold. One end of the second connecting arm is rotatably connected to the second fixed plate, and the other end is rotatably connected to the pivot. A first channel steel 11 is also rotatably connected to the pivot. The second connecting arm is located between the first channel steel and the first connecting arm. A ring buckle is fixedly installed at the end of the first channel steel.
[0031] The right inner mold includes a third inner mold and a fourth inner mold. The third inner mold and the fourth inner mold are hinged together by several second hinges 12. The second support assembly includes a third fixed plate 13, a third connecting arm 14, a second pivot 15, a fourth connecting arm 16, and a fourth fixed plate 17. The third fixed plate is fixedly installed on the inner wall of the third inner mold. One end of the third connecting arm is rotatably connected to the third fixed plate, and the other end is rotatably connected to the second pivot. The fourth fixed plate is fixedly installed on the inner wall of the fourth inner mold. One end of the fourth connecting arm is rotatably connected to the fourth fixed plate, and the other end is rotatably connected to the second pivot. A second channel steel 18 is also rotatably connected to the second pivot. The third connecting arm is located between the second channel steel and the fourth connecting arm. The end of the second channel steel is fixedly installed with the aforementioned ring buckle 25.
[0032] During concrete pouring, the first support component opens up the first inner mold and the second inner mold and supports the second inner mold, and the second support component opens up the third inner mold and the fourth inner mold and supports the fourth inner mold. The first inner mold, the second inner mold, the third inner mold and the fourth inner mold together form a circular inner mold.
[0033] The demolding device includes a power mechanism for pulling out the inner mold and an auxiliary demolding device that applies an upward force to the inner mold during the pulling out process. The auxiliary demolding device moves synchronously with the inner mold.
[0034] Specifically, the power mechanism is a winch, and the winch's wire rope 23 is connected to the ring buckle on the first or second channel steel via a connecting buckle.
[0035] The ring buckle is made of U-shaped steel, and the two ends of the U-shaped steel are fixed to the corresponding first channel steel and second channel steel. The connecting buckle is made of U-shaped rod, and the two ends of the U-shaped rod are detachably fixedly connected by connecting rod.
[0036] The auxiliary demolding device is a crane installed at the top of the workshop, with the crane's hook connected to the front end of the left or right inner mold.
[0037] During demolding, the left inner mold is larger than the right inner mold. Therefore, the right inner mold needs to be demolded first. The winch's wire rope is connected to the ring buckle of the second channel steel via a connecting buckle, pulling the second channel steel outward. As the second channel steel moves outward, the fourth inner mold remains stationary under gravity. The fourth inner mold disengages from the formed product and moves closer to the third inner mold. At this point, the area above the right inner mold is empty. The gantry crane moves to directly above the front end of the right inner mold, and its hook hooks into the hole at the front end of the right inner mold, lifting it upward. The winch and gantry crane move synchronously, pulling out the right inner mold, thus achieving demolding. The pulling-out action of the left inner mold is the same as that of the right inner mold. In the above process, the gantry crane applies an upward force to the inner mold (which can lift the front end of the right inner mold), reducing sliding friction. The synchronous movement of the gantry crane and the right inner mold ensures that an upward force is always applied to the right inner mold during the pulling-out process, facilitating the winch to pull out the inner mold. This results in low friction and low energy consumption.
[0038] The steel wire rope is connected to the connecting buckle by a ring-type connection.
[0039] The inner walls of the first, second, third, and fourth inner molds are all fixedly equipped with several reinforcing plates to improve the strength of the circular inner molds.
[0040] The contact surfaces of the left and right inner molds are sloped, and the sloped surfaces are made of strip steel.
[0041] The power mechanism can be any mechanism capable of linear motion, as long as it can pull the inner steel mold. In the scheme of this application, the power mechanism is specifically a winch. The wire rope of the winch is connected to the ring buckle through a connecting buckle. The connecting buckle is a U-shaped rod. The two ends of the U-shaped rod are detachably fixedly connected by a connecting rod, such as a high-strength bolt and nut fit, or an interference fit with a pin, etc.
[0042] The steel wire rope is connected to the connecting buckle by a ring-type connection.
[0043] After passing through the connecting buckle 24, one end of the wire rope is folded back and fixed with several fixing buckles. The fixing buckles include a base 20, a nut 21, and a U-shaped part 22 with threads on both ends. The U-shaped part is a rod. The base has two through holes. After the wire rope is joined together, it is placed on the base. After the U-shaped part passes through the through holes, it is locked and fixed with a nut.
[0044] It is preferable for the inner surface of the U-shaped part to be uneven to increase friction and facilitate locking.
[0045] For the auxiliary demolding device, it is necessary to apply an upward force to the inner mold. The upward force can be generated by lifting the inner mold from above or by pushing the inner mold from below. In the scheme of this application, the auxiliary demolding device is a crane installed on the top of the workshop.
[0046] The reason for using an overhead crane as an auxiliary demolding device is that it is an essential tool for the normal operation of the workshop, eliminating the need for additional auxiliary equipment and saving costs. Conversely, a lifting trolley could be used for support under the inner mold, but this would require additional trolleys in the workshop to complete the demolding work, increasing costs.
[0047] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. A pre-tensioning method plate girder forming mold comprising an outer mold, an inner mold, characterized in that, The inner mold comprises a left inner mold and a right inner mold, and the left inner mold and the right inner mold jointly form a circular inner mold. The left inner mold comprises a first inner mold and a second inner mold, and one end of the first inner mold and the second inner mold is hinged in the circumferential direction, and the other end is connected through a first support assembly. The right inner mold comprises a third inner mold and a fourth inner mold, and one end of the third inner mold and the fourth inner mold is hinged in the circumferential direction, and the other end is connected through a second support assembly. When the inner mold is demolded, the first support assembly or the second support assembly is pulled by the demolding device for demolding.
2. The pretensioner beam forming die of claim 1, wherein, The first inner mold and the second inner mold are hinged through a plurality of first hinges. The first support assembly comprises a first fixed plate, a first connecting arm, a first pivot, a second connecting arm and a second fixed plate. The inner wall of the first inner mold is fixedly installed with the first fixed plate. One end of the first connecting arm is rotatably connected to the first fixed plate, and the other end is rotatably connected to the first pivot. The inner wall of the second inner mold is fixedly installed with the second fixed plate. One end of the second connecting arm is rotatably connected to the second fixed plate, and the other end is rotatably connected to the pivot. A first channel steel is further rotatably connected to the pivot, and the second connecting arm is located between the first channel steel and the first connecting arm. The end of the first channel steel is fixedly installed with a ring-shaped buckle. The right inner mold comprises a third inner mold and a fourth inner mold, and the third inner mold and the fourth inner mold are hinged through a plurality of hinges. The second support assembly comprises a third fixed plate, a third connecting arm, a second pivot, a fourth connecting arm and a fourth fixed plate. The inner wall of the third inner mold is fixedly installed with the third fixed plate. One end of the third connecting arm is rotatably connected to the third fixed plate, and the other end is rotatably connected to the second pivot. The inner wall of the fourth inner mold is fixedly installed with the fourth fixed plate. One end of the fourth connecting arm is rotatably connected to the fourth fixed plate, and the other end is rotatably connected to the second pivot. A second channel steel is further rotatably connected to the second pivot, and the third connecting arm is located between the second channel steel and the fourth connecting arm. The end of the second channel steel is fixedly installed with the ring-shaped buckle.
3. The pretensioner beam forming die of claim 2, wherein, The demolding device comprises a power mechanism for pulling out the inner mold and an auxiliary demolding device for applying an upward force to the inner mold during the pulling out process. The auxiliary demolding device moves synchronously with the inner mold.
4. The pretensioner beam forming die of claim 3, wherein, The power mechanism is a winch, and the steel wire rope of the winch is connected to the ring-shaped buckle on the first channel steel or the second channel steel through a connecting buckle.
5. The pretensioner beam forming die of claim 4, wherein, The ring-shaped buckle is a U-shaped steel, and the two ends of the U-shaped steel are fixed on the corresponding first channel steel and second channel steel. The connecting buckle is a U-shaped rod, and the two ends of the U-shaped rod are fixedly connected through a connecting rod.
6. The pretensioner beam forming die of claim 3, wherein, The steel wire rope is connected to the connecting buckle in a looped manner.
7. The pretensioner beam forming die of claim 1, wherein, The auxiliary demolding device is a travelling crane arranged on the top of the workshop, and the hook of the travelling crane is connected to the front end of the left inner mold or the right inner mold.
8. The pretensioner beam forming die of claim 5, wherein, The front end surface of the left inner mold and the right inner mold has a hole, and the hook is hooked in the hole.
9. The pretensioner beam forming die of claim 2, wherein, The inner wall of the first inner mold and the second inner mold is fixedly installed with a plurality of rib plates.
10. The pretensioner beam forming die of claim 2, wherein, The contact surface of the left inner mold and the right inner mold is a slope.