Permanent and temporary combined concrete precast slab bottom die device

Abstract

The utility model relates to the technical field of construction equipment, in particular to a permanent and temporary combined concrete precast slab bottom die device which comprises two rectangular precast slabs, four hanging rings are installed on each precast slab, each precast slab is formed by pouring two layers of reinforcing meshes through concrete, and the precast slabs are hoisted to supporting chamfers on the inner wall of a pier body through hoisting equipment. A diaphragm plate is poured on the pier body, and the prefabricated plate, the pier body and the diaphragm plate form an integral stress structure. According to the permanent and temporary combined concrete precast slab bottom die device, the precast slab serves as the bottom die, after construction of the transverse partition plate is completed, complex dismantling operation through a manhole is not needed, and permanent and temporary combination of the bottom die is achieved. In other words, the prefabricated slab plays a role of a formwork in the construction process and becomes a part of a bridge structure after construction is completed, and material waste is avoided. Due to the fact that the prefabricated slabs are hoisted to the supporting chamfers on the inner wall of the pier body through hoisting equipment, constructors do not need to enter manholes to conduct dismantling operation, and potential safety hazards in the construction process are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of construction equipment technology, and more specifically, to a permanent and temporary concrete precast slab bottom formwork device. Background Technology

[0002] In bridge engineering substructures, high piers are often used when encountering significant elevation differences, especially hollow piers exceeding 40 meters in height. A transverse diaphragm is typically installed inside the hollow pier at a height of 15-20 meters to enhance structural stability. The design unit usually includes a manhole in the diaphragm, primarily to allow for the removal of the diaphragm's formwork after construction.

[0003] However, in actual construction, the bottom formwork of the diaphragm is usually assembled from large pieces of formwork, which presents the following problems:

[0004] Removal difficulties: Due to the large size of the template blocks, it is difficult to remove the bottom template through the reserved manhole.

[0005] Safety hazards: Construction workers need to enter the manhole to carry out demolition work, which is not only difficult to operate, but also poses a great safety hazard.

[0006] Therefore, in most cases, after the diaphragm construction is completed, the bottom formwork is not removed but left inside the pier. This practice not only wastes materials but may also affect the overall structure and aesthetics of the bridge. Utility Model Content

[0007] The purpose of this utility model is to provide a permanent and temporary concrete precast slab bottom formwork device to solve the problem mentioned in the background art that, due to the large size of the formwork blocks, it is difficult to remove the bottom formwork through the reserved manhole, and construction personnel need to enter the manhole to carry out the removal work, which is not only difficult to operate, but also poses a great safety hazard.

[0008] To achieve the above objectives, this utility model provides a permanent and temporary combined precast concrete slab bottom formwork device, comprising two rectangular precast slabs, each precast slab being equipped with four lifting rings. The precast slab is formed by pouring concrete through two layers of steel mesh. The precast slab is hoisted onto the supporting chamfer of the inner wall of the pier by a lifting device. A transverse diaphragm is poured on the pier body. The precast slab, the pier body, and the transverse diaphragm form an integral load-bearing structure.

[0009] Preferably, the precast slab has dimensions of 1m in length, 1.05m in width, and 0.2m in thickness.

[0010] Preferably, the lifting rings are located on the four sides of the precast slab.

[0011] Preferably, the steel mesh is composed of a combination of main bars and distribution bars, wherein the main bars are made of φ12 steel bars and the distribution bars are made of φ8 steel bars.

[0012] Preferably, the lifting ring is embedded in the concrete of the precast slab.

[0013] Preferably, after the prefabricated panels are assembled, an inlet and outlet are provided in the middle of the overall structure.

[0014] Preferably, the diaphragm is formed by pouring concrete with a single layer of steel mesh.

[0015] Preferably, the support chamfer is formed by pouring reinforced concrete.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] In this permanent-temporary combined precast concrete slab bottom formwork device, the precast slab serves as the bottom formwork. After the diaphragm construction is completed, there is no need for complex dismantling operations through manholes, thus achieving a permanent-temporary combination of the bottom formwork. That is, the precast slab acts as a template during construction and becomes part of the bridge structure after construction, avoiding material waste.

[0018] Since the precast slabs are hoisted onto the chamfered supports on the inner wall of the pier using lifting equipment, construction workers do not need to enter the manhole for dismantling operations, which greatly reduces safety hazards during construction and improves construction safety.

[0019] Precast slabs are manufactured in the factory, and on-site installation only requires lifting equipment, simplifying the construction process and improving efficiency. At the same time, the standardized production of precast slabs ensures consistent construction quality.

[0020] The precast slabs, piers, and diaphragms form an integrated load-bearing structure, enhancing the stability of the bridge structure. The two-layer steel mesh design within the precast slabs, as well as the use of reinforced steel bars in the concrete for the chamfered supports, further improve the structure's load-bearing capacity and seismic performance.

[0021] The dimensions and steel reinforcement specifications of the precast slabs can be adjusted according to actual engineering needs, making them highly adaptable. This invention's proposed permanent-temporary combined precast concrete slab bottom formwork device can be applied in areas with significant elevation differences or in other bridge structures requiring diaphragms. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0024] Figure 3 This is one of the schematic diagrams illustrating the use of this utility model;

[0025] Figure 4 This is the second schematic diagram of the use of this utility model;

[0026] The meanings of the labels in the diagram are as follows:

[0027] 1. Precast slab; 11. Inlet / outlet; 12. Steel mesh; 121. Main reinforcement; 122. Distribution reinforcement; 2. Lifting ring; 3. Pier body; 4. Support chamfer; 41. Reinforcing steel; 5. Diaphragm. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] This utility model provides a bottom formwork device for a permanent-temporary combined precast concrete slab, such as... Figures 1-4 As shown, the structure comprises two rectangular precast slabs 1, each with four lifting rings 2. The precast slabs 1 are formed by pouring concrete over two layers of steel mesh 12. The precast slabs 1 are hoisted onto the chamfered support 4 on the inner wall of the pier 3 using lifting equipment. A transverse diaphragm 5 is then poured onto the pier 3. The precast slabs 1, pier 3, and transverse diaphragms 5 form an integral load-bearing structure. The use of two rectangular precast slabs 1 and the installation of four lifting rings 2 on each slab facilitates the hoisting and positioning of the precast slabs. The two layers of steel mesh 12, poured with concrete, ensure the structural strength and stability of the precast slabs. Once the precast slabs 1 are hoisted onto the chamfered support 4 on the inner wall of the pier 3, they, along with the pier 3 and transverse diaphragms 5, form an integral load-bearing structure, enhancing the overall load-bearing capacity and stability of the bridge. This device not only simplifies the construction process and improves construction efficiency, but also achieves a permanent and temporary combination of bottom formwork, avoiding the problems of difficult removal and material waste associated with traditional bottom formwork, and has significant technical advantages and application value.

[0030] In this embodiment, the precast slab has dimensions of 1m in length, 1.05m in width, and 0.2m in thickness. Specifically, precast slab 1 has dimensions of 1m in length, 1.05m in width, and 0.2m in thickness. This dimensional design ensures sufficient strength for the precast slab while facilitating transportation and installation, thus improving construction efficiency.

[0031] Specifically, the lifting rings 2 are located on the four sides of the precast slab 1. This design ensures that the precast slab is subjected to uniform force during hoisting, making it easy to control and improving the safety and stability of the hoisting process.

[0032] Furthermore, the reinforcing mesh 12 is composed of several main bars 121 and distribution bars 122. The main bars 121 are made of φ12 steel bars, and the distribution bars 122 are made of φ8 steel bars. This combination method ensures the structural strength of the precast slab, optimizes the use of reinforcing steel, and reduces costs.

[0033] Furthermore, the lifting ring 2 is embedded in the concrete of the precast slab 1. This design integrates the lifting ring with the precast slab, enhancing the ring's stability and improving safety during the lifting process.

[0034] Furthermore, after the precast slabs 1 are assembled, an entrance / exit 11 is provided in the middle of the overall structure. This design facilitates the entry and exit of construction personnel and improves the convenience of construction.

[0035] Furthermore, the diaphragm 5 is formed by pouring concrete with a single layer of steel mesh. This design not only ensures the structural strength of the diaphragm but also simplifies the construction process and improves construction efficiency.

[0036] Furthermore, the supporting chamfer 4 is formed by pouring concrete with reinforcing steel bars 41. This design enhances the load-bearing capacity of the supporting chamfer and improves the stability of the entire structure.

[0037] In use, the precast concrete slab bottom formwork device of this utility model, which combines permanent and temporary installations, firstly, the precast slab 1 is designed as a rectangle with dimensions of 1m in length, 1.05m in width, and 0.2m in thickness. This size design ensures sufficient strength of the precast slab while facilitating transportation and installation. The precast slab 1 is formed by pouring concrete through two layers of steel mesh 12. The steel mesh 12 is composed of several main bars 121 and distribution bars 122. The main bars 121 use φ12 steel bars, and the distribution bars 122 use φ8 steel bars. This combination method ensures the structural strength of the precast slab, optimizes the use of steel bars, and reduces costs. Lifting rings 2 are installed on the four sides of the precast slab 1 and are pre-embedded in the concrete. This design makes the lifting rings and the precast slab an integral part, enhancing the stability of the lifting rings and improving safety during the lifting process.

[0038] Using lifting equipment, the precast slab 1 is hoisted onto the chamfered support 4 on the inner wall of the pier 3 via lifting rings 2. The chamfered support 4 is formed by pouring concrete with reinforcing steel bars 41, which enhances its load-bearing capacity and ensures the stable installation of the precast slab 1. During the hoisting process, because the lifting rings 2 are located on the four sides of the precast slab 1, the precast slab is subjected to uniform stress, which is easy to control and improves the safety and stability of the hoisting.

[0039] Transverse diaphragms 5 are poured onto pier 3, and diaphragms 5 are formed by pouring concrete using a single layer of steel mesh. This design ensures the structural strength of the diaphragms while simplifying the construction process. The precast slab 1, together with pier 3 and diaphragms 5, forms an integral load-bearing structure, enhancing the overall load-bearing capacity and stability of the bridge.

[0040] After the precast slabs are assembled, an entrance / exit 11 is provided in the middle of the overall structure. This design facilitates the entry and exit of construction personnel and improves the convenience of construction.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A permanent and temporary combined precast concrete slab bottom formwork device, comprising two rectangular precast slabs (1), characterized in that: Each of the precast slabs (1) is equipped with four lifting rings (2). The precast slabs (1) are made of two layers of steel mesh (12) by concrete pouring. The precast slabs (1) are hoisted to the supporting chamfer (4) on the inner wall of the pier body (3) by lifting equipment. The diaphragm (5) is poured on the pier body (3). The precast slabs (1), the pier body (3), and the diaphragm (5) form an integral load-bearing structure.

2. The permanent-temporary combined precast concrete slab bottom formwork device according to claim 1, characterized in that: The precast slab has dimensions of 1m in length, 1.05m in width, and 0.2m in thickness.

3. The permanent-temporary combined precast concrete slab bottom formwork device according to claim 1, characterized in that: The lifting ring (2) is located on the four sides of the precast slab (1).

4. The permanent and temporary combined precast concrete slab bottom formwork device according to claim 1, characterized in that: The steel mesh (12) is composed of several main bars (121) and distribution bars (122). The main bars (121) are made of φ12mm steel bars, and the distribution bars (122) are made of φ8mm steel bars.

5. The permanent-temporary combined precast concrete slab bottom formwork device according to claim 1, characterized in that: The lifting ring (2) is embedded in the concrete of the precast slab (1).

6. The permanent-temporary combined precast concrete slab bottom formwork device according to claim 1, characterized in that: After the prefabricated slabs (1) are assembled, an inlet and outlet (11) is provided in the middle of the overall structure.

7. The permanent-temporary combined precast concrete slab bottom formwork device according to claim 1, characterized in that: The diaphragm (5) is formed by pouring concrete with a single layer of steel mesh.

8. The permanent-temporary combined precast concrete slab bottom formwork device according to claim 1, characterized in that: The supporting chamfer (4) is formed by pouring concrete with reinforcing steel bars (41).

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