Disassembly-free assembly type formwork for deformation joint construction

Abstract

The utility model discloses a disassembly-free assembly type formwork for deformation joint construction, the disassembly-free assembly type formwork is formed by welding a plurality of sections of rectangular steel reinforcement framework units end to end, and each steel reinforcement framework unit mainly comprises a rectangular steel reinforcement framework, a polyethylene foam plate, a fast and easy closing net and a rubber water stop belt, the rubber waterstop is horizontally laid between the upper steel reinforcement framework and the lower steel reinforcement framework, the polyethylene foam board is laid in a rectangular inner frame of the steel reinforcement framework, and the fast and easy closing-up nets are welded to the left side and the right side of the steel reinforcement framework. Compared with the prior art, in the concrete pouring construction process of the deformation joint, the quality problems that the forming quality of the deformation joint is poor, the appearance is not attractive and the like due to the fact that a building method deviates due to impact force brought by concrete pouring can be effectively solved; by the adoption of the device, rapid concrete construction can be achieved, operation can be conducted without waiting for the intermittent time of the construction joint technology, and the construction period is shortened.

Description

Technical Field

[0001] The utility model relates to the field of construction engineering, in particular to a demounting-free assembled formwork for construction of deformation joints. Background Art

[0002] In the traditional construction process of deformation joints, for relatively small deformation joints, a foam board is generally stuffed at the deformation joint in advance as a formwork. However, due to the limitations of the material itself, this technology cannot be applied to deformation joints of ultra-long, ultra-thick, and large-volume concrete, because the foam board cannot be effectively fixed, and the foam board cannot withstand the impact force and lateral pressure generated during concrete pouring. At the same time, the foam board also cannot withstand the vibration force generated by the concrete vibrator.

[0003] Therefore, the existing method is to use wooden formwork + skip-joint method for construction. The skip-joint method has a significant effect on reducing cracks in ultra-long, ultra-thick, and ultra-thin large-volume concrete. The skip-joint method divides the concrete floor into multiple bins, usually four bins. First, pour the two diagonal bins. After the concrete in the two bins solidifies to a certain strength, remove the wooden formwork, and then pour the concrete bins on the other two diagonals. Since the wooden formwork needs to be removed, the four bins cannot be poured simultaneously, resulting in a long construction period, which cannot meet the on-site working surface and project construction period, and is uneconomical for this project and the labor cost will also increase.

[0004] During the construction of the raft deformation joint of a certain sewage treatment plant by our company, if we want to ensure meeting the design requirements, we can only construct one side of the raft first. After the concrete strength reaches the design strength requirements, remove the formwork and then construct the other side of the raft. Although the quality can be guaranteed in this way, it does not meet the construction period requirements. If we want to ensure the construction period requirements, we can only directly use extruded polystyrene board as the formwork and pour concrete directly on both sides of the extruded polystyrene board. Although the construction period can be met in this way, the quality cannot meet the requirements. The above two construction technologies cannot meet the construction period and quality requirements of this project. Therefore, through research, the utility model provides a demounting-free assembled formwork for deformation joints and a construction method, which can solve the adverse effects of the construction period and quality at the same time. Summary of the Utility Model

[0005] The utility model provides a demounting-free assembled formwork for construction of deformation joints, which solves the above problems.

[0006] To achieve the above object, the technical solution adopted by the utility model is: a demountable prefabricated formwork for construction joints, including the demountable prefabricated formwork, which is formed by welding multiple rectangular steel bar framework units end to end. The steel bar framework unit is mainly composed of a rectangular steel bar framework, a polyethylene foam board, a quick installation closing net and a rubber waterstop. The steel bar framework is divided into an upper steel bar framework and a lower steel bar framework. The rubber waterstop is horizontally laid between the upper steel bar framework and the lower steel bar framework. The polyethylene foam board is laid in the rectangular inner frame of the steel bar framework, and the four sides of the polyethylene foam board are tied and fixed to the steel bar framework. The quick installation closing net is welded to the left and right sides of the steel bar framework and is closely attached to the two side surfaces of the polyethylene foam board.

[0007] Preferably, the upper steel bar framework and the lower steel bar framework have the same shape and are both welded by two horizontal steel bars and three vertical steel bars. The horizontal steel bars are arranged horizontally and parallel, and the vertical steel bars are all vertically welded between the two horizontal steel bars, with two of them welded at both ends of the horizontal steel bars and one welded in the middle of the horizontal steel bars.

[0008] Preferably, the steel bar frameworks are all made of grade III steel with a diameter of 28mm and are waste steel bars on site.

[0009] Preferably, the polyethylene foam board is rectangular and matches the shape of the rectangular inner frame of the steel bar framework.

[0010] Preferably, a binding point is made every 500mm around the polyethylene foam board and it is tied and fixed to the steel bar framework with iron wire. A welding point is made every 500mm for the quick installation closing net and it is welded and fixed to the steel bar framework. The welding points and the binding points are arranged in a staggered manner.

[0011] Compared with the prior art, the advantages of the utility model are as follows:

[0012] (1) The utility model designs a demountable prefabricated formwork, which can effectively avoid the quality problems such as the deviation of building practices caused by the impact force during the concrete pouring construction of the construction joint, resulting in poor forming quality of the construction joint and unbeautiful appearance. Under the premise of ensuring the quality and appearance requirements, it can also save the construction period of concrete pouring and the construction period of subsequent building practices. Using this device can realize the rapid construction of concrete and can carry out operations without waiting for the technical intermittent time of the construction joint, thus saving the construction period.

[0013] (2) By introducing the technical concept of prefabricated green and low-carbon, using the on-site steel bar waste can reduce the steel bar loss rate of this project and reduce the input cost.

[0014] (3) The non-dismantling prefabricated formwork is designed to be miniaturized and modularized. The upper steel bar framework, rubber waterstop, and lower steel bar framework are installed independently and can be placed separately during the process of laying raft slab steel bars and pouring concrete, greatly reducing the installation difficulty.

[0015] (4) The steel bar framework can increase the stability of the formwork, bear the lateral pressure brought by the concrete pouring on both sides well, and improve the overall quality.

[0016] (5) Through the design of the polyethylene foam board, the concrete on both sides of the deformation joint can be separated. Its chemical properties are stable and not easily corroded. It can be used as a buffer material in the deformation joint without demolition. After being reinforced by the steel bar framework, it can be applied to the construction of deformation joints of extra-long, extra-thick, and large-volume concrete.

[0017] (6) Through the design of the easy-to-close mesh, it can block the concrete and at the same time disperse the lateral pressure brought by the pouring concrete, making the force more uniform and reliable. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the steel bar framework unit of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the steel bar framework of the present utility model;

[0020] Figure 3 is an assembly schematic diagram of the non-dismantling prefabricated formwork of the present utility model;

[0021] Figure 4 is a schematic structural diagram of the non-dismantling prefabricated formwork of the present utility model in the deformation joint of concrete.

[0022] In the figure: 1. Steel bar framework; 11. Transverse steel bars; 12. Longitudinal steel bars; 2. Polyethylene foam board; 3. Rubber waterstop; 4. Easy-to-close mesh; 5. Closed-cell foam board; 6. Concrete; 7. Deformation joint. Detailed Embodiment

[0023] The present utility model will be further described below.

[0024] Embodiment: A non-dismantling prefabricated formwork for the construction of deformation joints, see Figures 1 to 4, including a non-dismantling prefabricated formwork, which is formed by welding the ends of multiple rectangular steel bar framework units end to end. The steel bar framework unit mainly consists of a rectangular steel bar framework 1, a polyethylene foam board 2, a quick-installing closing net 4, and a rubber water stop 3. The steel bar framework 1 is divided into an upper steel bar framework 1 and a lower steel bar framework 1. The rubber water stop 3 is horizontally laid between the upper steel bar framework 1 and the lower steel bar framework 1. The polyethylene foam board 2 is laid within the rectangular inner frame of the steel bar framework 1, and the four sides of the polyethylene foam board 2 are tied and fixed to the steel bar framework 1. The quick-installing closing net 4 is welded to the left and right sides of the steel bar framework 1 and is closely attached to both side surfaces of the polyethylene foam board 2.

[0025] The overall stability of the formwork is improved by the steel bar framework 1, and good support strength is provided for the polyethylene foam board 2, avoiding problems such as the deviation of building practices and poor forming quality of the deformation joint 7 caused by the impact force during the pouring of concrete 6.

[0026] The concrete 6 on both sides of the deformation joint 7 is separated by the polyethylene foam board 2. The polyethylene foam board 2 has stable chemical properties and is not easily corroded. It can be used as a buffer material in the deformation joint 7 and does not need to be removed. After being reinforced by the steel bar framework 1, it is applicable to the construction of deformation joints 7 for super-long, super-thick, and large-volume concrete 6.

[0027] The quick-installing closing net 4 plays a role in blocking the concrete 6, and at the same time, it can also disperse the lateral pressure brought by the pouring of concrete 6, making the force more uniform and reliable.

[0028] If the upper steel bar framework 1, the lower steel bar framework 1, and the rubber water stop 3 of the steel bar framework unit are fixed into a whole in advance, during the process of laying the raft slab steel bars, the whole steel bar framework unit needs to be embedded, and each section of the steel bar framework unit needs to be welded together in sequence. In this way, both handling and welding are very inconvenient, and the installation, laying, and fixing of the polyethylene foam board 2 and the quick-installing closing net 4 are also very troublesome, with low efficiency. Therefore, the present utility model has carried out modular design on the steel bar framework unit. The upper steel bar framework 1, the lower steel bar framework 1, and the rubber water stop 3 are not fixed to each other. Before construction, only the polyethylene foam board 2 and the quick-installing closing net 4 need to be fixed in the steel bar framework 1 in advance and placed aside for use. During the process of laying the raft slab steel bars, the lower steel bar framework 1, the rubber water stop 3, and the upper steel bar framework 1 are placed synchronously, and the lower steel bar framework 1, the rubber water stop 3, and the upper steel bar framework are installed and limited by the tied raft slab steel bars. As the tied height of the raft slab steel bars increases, the assembly of the steel bar framework unit is completed. The operation is very convenient, and after modular design, a single person can easily carry it, which is very convenient.

[0029] The upper steel bar framework 1 and the lower steel bar framework 1 have the same shape and are both welded by two horizontal steel bars 11 and three vertical steel bars 12. The horizontal steel bars 11 are arranged horizontally and parallel to each other. The vertical steel bars 12 are all vertically welded between the two horizontal steel bars 11, with two of them welded at both ends of the horizontal steel bar 11 and one welded in the middle of the horizontal steel bar 11. A stable support frame structure is formed by the horizontal steel bars 11 and the vertical steel bars 12, which can increase its stability and can better bear the lateral pressure brought by the pouring of the concrete 6 on both sides.

[0030] To ensure the stable support effect, the steel bar frameworks 1 are all made of grade III steel with a diameter of 28mm. The steel bar frameworks 1 are made by cutting the on-site waste steel bars, which can reduce the steel bar loss rate of this project and reduce the input cost.

[0031] The polyethylene foam board 2 is rectangular and matches the shape of the rectangular inner frame of the steel bar framework 1. To better connect the polyethylene foam board 2 with the steel bar framework 1 and prevent local fracture, a binding point is made every 500mm around the polyethylene foam board 2, and it is fixed to the steel bar framework 1 by wire binding.

[0032] To better connect the easy-to-close mesh 4 with the steel bar framework 1, a welding point is made every 500mm on the easy-to-close mesh 4, and it is welded and fixed to the steel bar framework 1. The welding points and the binding points are arranged in a staggered manner, which can further disperse the lateral pressure brought by the pouring of the concrete 6 and prevent the binding points of the polyethylene foam board 2 from breaking.

[0033] The specific construction and usage method of the present utility model is as follows:

[0034] Step S1: Cut the on-site waste steel bars into horizontal steel bars 11 and vertical steel bars 12, and weld the horizontal steel bars 11 and the vertical steel bars 12 into multiple rectangular steel bar frameworks 1. The horizontal steel bars 11 are all made of grade III steel with a diameter of 28mm. The length of the horizontal steel bars 11 is 3000mm, and the length of the vertical steel bars 12 is 272 or 44m, specifically determined according to the pouring height;

[0035] Step S2: Set the polyethylene foam board 2 inside the rectangular inner frame of the steel bar framework 1, and fix the polyethylene foam board 2 around it to the steel bar framework 1 by binding;

[0036] Step S3: Set the easy-to-close mesh 4 on the left and right sides of the steel bar framework 1, weld the easy-to-close mesh 4 to the steel bar framework 1, and place it for standby;

[0037] Step S4: Lay the raft slab steel bars. When laying to a certain height, insert the steel bar cage 1 along the length direction of the deformation joint 7 as the lower steel bar cage 1. Weld and fix between adjacent lower steel bar cages 1. When the raft slab steel bars are laid to half of the height, lay the embedded rubber waterstop 3 above the deformation joint 7, and then continue to tie the raft slab steel bars. Insert the steel bar cage 1 again along the length direction of the deformation joint 7 as the upper steel bar cage 1. Weld and fix between adjacent upper steel bar cages 1, and then continue to tie the raft slab steel bars until the laying of the raft slab steel bars is completed. Since the steel bar cage 1 is miniaturized and modularized, the upper steel bar cage 1, the rubber waterstop 3, and the lower steel bar cage 1 are independently installed and can be placed separately during the pouring process of laying the raft slab steel bars. By using the deformation joint 7 formed by the laid raft slab steel bars, the clamping installation on both sides of the upper steel bar cage 1 and the lower steel bar cage 1 can be realized, and it can be installed synchronously with the installation progress of laying the raft slab steel bars, greatly reducing the installation difficulty. The whole formwork not only has good structural strength and good appearance, but also does not need to be demolished after pouring. Moreover, it can be poured simultaneously on both sides, enabling rapid construction of the concrete 6, and does not need to wait for the technical intermittent time of the construction joint, so the operation can be carried out, saving the construction period;

[0038] Step S5: After the laying of the raft slab steel bars is completed, pour the concrete 6 simultaneously on both sides of the deformation joint 7. When the pouring height is flush with the top of the upper steel bar cage 1, lay the 30-mm-thick closed-cell foam board 5 above the deformation joint 7 until, and then continue to pour until the final pouring height is flush with the upper surface of the closed-cell foam board 5. The closed-cell foam board 5 has an independent closed-cell bubble structure, and the honeycomb-like holes are evenly distributed on the surface. It is firmly and closely integrated with the cement binder. Placed on the surface of the deformation joint 7, it can naturally adapt to the expansion and contraction changes, enhancing the expansion waterstop effect;

[0039] Step S6: After the concrete 6 is completely solidified, the construction project is completed.

[0040] The above has introduced in detail a kind of demountable prefabricated formwork for deformation joint construction provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. It is possible to make changes and improvements to the present utility model without exceeding the concept and scope defined by the appended claims. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A demountable prefabricated formwork for construction of expansion joints, including a demountable prefabricated formwork, characterized in that: The non-dismantling prefabricated formwork is formed by welding the head and tail of multiple rectangular steel bar framework units. The steel bar framework unit is mainly composed of a rectangular steel bar framework, a polyethylene foam board, a quick-install closing net, and a rubber waterstop belt. The steel bar framework is divided into an upper steel bar framework and a lower steel bar framework. The rubber waterstop belt is horizontally laid between the upper steel bar framework and the lower steel bar framework. The polyethylene foam board is laid inside the rectangular inner frame of the steel bar framework, and the four sides of the polyethylene foam board are tied and fixed to the steel bar framework. The quick-install closing net is welded to the left and right sides of the steel bar framework and is closely attached to both side surfaces of the polyethylene foam board.

2. The prefabricated formwork for deformation joint construction according to claim 1, wherein: The upper steel bar framework and the lower steel bar framework have the same shape and are both formed by welding two horizontal steel bars and three vertical steel bars. The horizontal steel bars are arranged horizontally and parallel to each other. The vertical steel bars are all vertically welded between the two horizontal steel bars, with two of them welded at both ends of the horizontal steel bars and one welded in the middle of the horizontal steel bar.

3. The prefabricated formwork for deformation joint construction according to claim 2, wherein: All the steel bar frameworks are made of grade III steel with a diameter of 28mm and are waste steel bars on site.

4. The prefabricated formwork for deformation joint construction according to claim 1, characterized in that: The polyethylene foam board is rectangular and matches the shape of the rectangular inner frame of the steel bar framework.

5. The prefabricated formwork for deformation joint construction according to claim 1, wherein: At every 500mm along the four sides of the polyethylene foam board, there is a tying point, and it is tied and fixed to the steel bar framework with wire. At every 500mm on the quick-install closing net, there is a welding point, and it is welded and fixed to the steel bar framework. The welding points and the tying points are arranged in a staggered manner.

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