A flat warehouse double-layer roof lower layer board hoisting mold structure and a construction method thereof

Abstract

This invention relates to the field of suspended formwork technology, specifically to a suspended formwork structure for the lower slab of a double-layered roof in a flat warehouse, and its construction method. The suspended formwork structure includes multiple tie rods and multiple templates. The upper end of each tie rod has a connecting part for connecting to the roof truss of the flat warehouse. The lower end of each tie rod has a sheath and a support ring. The sheath is detachably fitted over the tie rod, and the support ring is detachably fitted over the lower end of the tie rod. The upper end of the support ring has a stepped hole, and the lower end of the sheath is detachably inserted into the large-diameter end of the stepped hole. The large-diameter end of the stepped hole has a sealing ring that seals the gap between the side wall of the stepped hole and the outer wall of the sheath, with the upper end of the sealing ring protruding from the support ring. A through-hole is provided in the middle of the template, and the sheath passes through the through-hole. The lower side of the template abuts against the upper surface of the support ring, allowing for quick removal of the tie rods and ensuring the sealing of the lower slab. The construction method is based on the aforementioned suspended formwork structure for the lower slab of a double-layered roof in a flat warehouse.

Description

Technical Field

[0001] This invention relates to the field of suspended formwork technology, specifically to a suspended formwork structure for the lower slab of a double-layer roof in a flat warehouse and its construction method. Background Technology

[0002] To improve grain storage, fully cast-in-place double-layer self-ventilated roof flat warehouses have emerged. The lower layer of the roof is a flat slab, while the upper layer is shaped like a quadratic parabolic arch or other types of structure, creating a ventilated space between the upper and lower slabs. These warehouses offer excellent sealing, insulation, and waterproofing. However, due to the large span and area of ​​these flat warehouses, the lower layer is typically constructed using a full-span scaffolding system. While this ensures a high degree of flatness, it requires a massive amount of scaffolding material, has a low turnover rate, and demands high standards for scaffolding erection, resulting in limited construction space and low efficiency. If a conventional suspended formwork structure is used on the steel roof truss, a large number of standard tie bolts are required. After pouring, extensive cutting is necessary, and the exposed tie rods must be sealed. This not only increases labor intensity but also makes it difficult to guarantee the airtightness of the lower layer when sealing the tie rods later. Summary of the Invention

[0003] To address the technical problem of ensuring the sealing of the lower slab after pouring the existing double-layer roof formwork for flat warehouses, this invention provides a formwork structure and construction method for the lower slab of a double-layer roof for flat warehouses. After the lower slab is poured, the formwork can not only be quickly removed, but also the holes left after the removal of the formwork can be quickly sealed, thereby ensuring the sealing of the lower slab.

[0004] This invention is achieved through the following technical solution:

[0005] In a first aspect, the present invention provides a suspended formwork structure for the lower layer of a double-layer roof of a flat warehouse, comprising multiple tie rods and multiple templates; the upper end of each tie rod is provided with a hook-up part for hooking with the roof truss of the flat warehouse; the lower end of each tie rod is provided with a sheath and a support ring, the sheath being detachably fitted over the tie rod, and the support ring being detachably fitted over the lower end of the tie rod; the upper end of the support ring is provided with a stepped hole, and the lower end of the sheath is detachably inserted into the large-diameter end of the stepped hole; the large-diameter end of the stepped hole is provided with a sealing ring, the sealing ring being able to seal the gap between the side wall of the stepped hole and the outer wall of the sheath, and the upper end of the sealing ring protruding from the support ring; the middle of each template is provided with a through-rib hole, the sheath passing through the through-rib hole, and the lower side of the template abutting against the upper end face of the support ring.

[0006] The suspended formwork structure for the lower slab of a double-layer roof of a flat warehouse provided by this invention has a hanging part at the upper end of the suspension rod. It can be hung on the roof truss of the flat warehouse through the hanging part, so that the suspension rod is vertically hung on the roof truss. The lower end of the suspension rod is provided with a sheath and a support ring. The sheath is sleeved on the outside of the suspension rod, and the support ring is detachably sleeved on the lower end of the suspension rod. At the same time, a through hole is provided in the middle of the formwork, so that the sheath can be inserted into the through hole. At this time, by connecting the support ring to the lower end of the suspension rod, the lower side of the formwork can be abutted against the upper end of the support ring, so that the formwork can be suspended under the roof truss without the need to support the formwork frame, thus avoiding the occupation of the scaffolding for a long time.

[0007] Therefore, during the hoisting process, it is only necessary to attach the hoisting rods, lift / pull the formwork, and connect the support rings after passing the lower end of the hoisting rods through the formwork. The installation of the formwork is simple and convenient, which can significantly improve the erection efficiency of the lower slab formwork of the double-layer roof of the flat warehouse.

[0008] The support ring has a stepped hole at its upper end, and the lower end of the sheath is detachably inserted into the large-diameter end of the stepped hole. A sealing ring is installed at the large-diameter end of the stepped hole to seal the gap between the side wall of the stepped hole and the outer wall of the sheath, preventing concrete mortar from seeping between the support ring and the sheath, thus avoiding leakage and hindering the disassembly of the support ring. Simultaneously, the upper end of the sealing ring protrudes from the support ring, and the gap between the support ring and the template is sealed by pressing the sealing ring down, thereby preventing mortar leakage between the support ring and the template.

[0009] Furthermore, since both the sheath and the support ring are detachably connected to the tie rods, after the lower slab of the double-layer roof of the flat warehouse reaches the set structural strength, the support ring can be removed first, allowing the formwork to be dismantled and the tie rods to be pulled out from the sheath. No steel bars are exposed outside the lower slab of the double-layer roof of the flat warehouse, eliminating the need to cut steel bars, thus improving work efficiency and the construction environment. The sheath is embedded in the lower slab of the double-layer roof of the flat warehouse; simply sealing the inner hole of the sheath with a sealant ensures the airtightness of the lower slab of the double-layer roof of the flat warehouse. Compared to protecting cut steel bars, the construction process is simple and highly efficient.

[0010] In summary, the suspended formwork structure for the lower slab of a double-layer roof in a flat warehouse provided by this invention is simple and convenient to install, which can significantly improve the erection efficiency of the lower slab formwork for a double-layer roof in a flat warehouse. After the lower slab is poured, the tie bars can be quickly removed, and there are no exposed steel bars outside the lower slab of the double-layer roof in the flat warehouse. There is no need to cut the steel bars, which can improve work efficiency and improve the construction environment. Moreover, it can quickly seal the holes left after the tie bars are removed, thereby ensuring the airtightness of the lower slab.

[0011] In an optional embodiment, a turnbuckle is provided between the tie rod and the hanging part; the upper end of the turnbuckle is screwed to the hanging part, and the lower end of the turnbuckle is screwed to the upper end of the tie rod. By rotating the turnbuckle, the distance between the tie rod and the hanging part can be adjusted. This facilitates the adjustment of the template height and ensures the coplanarity of multiple templates, resulting in a high degree of flatness in the lower layer of the double-layer roof of the flat warehouse, thus preventing the lower layer of the double-layer roof of the flat warehouse from exerting lateral forces on the walls of the flat warehouse.

[0012] In an optional embodiment, a pin hole is provided at the lower end of the tie rod, and the pin hole extends radially along the tie rod; a limiting pin is movably inserted in the pin hole, both ends of the limiting pin can protrude from the tie rod, and the upper side of the limiting pin abuts against the lower side of the support ring. Through the cooperation of the limiting pin and the pin hole, the support ring can be quickly restricted to the lower end of the tie rod, and the support ring can also be quickly removed from the tie rod.

[0013] In an optional embodiment, the pin hole is an elongated hole along the length of the tie rod, so that the limiting pin can be flipped in the length direction of the pin hole, ensuring that the limiting pin has sufficient contact area with the template and avoiding damage to the template by the limiting pin during pouring.

[0014] In an optional embodiment, the sheath includes an upper sleeve and a lower sleeve, with a flexible ring disposed between the upper and lower sleeves; the upper end of the flexible ring is fixedly connected to the lower end of the upper sleeve, and the lower end of the flexible ring is fixedly connected to the upper end of the lower sleeve; the outer diameter of the flexible ring is greater than or equal to the outer diameter of the upper or lower sleeve, the inner diameter of the flexible ring is smaller than the inner diameter of the upper or lower sleeve, and the inner diameter of the flexible ring is greater than the outer diameter of the tie rod, so as to seal the through hole of the sheath by squeezing the flexible ring, and at the same time, squeezing the flexible ring makes the concrete outside the flexible ring sheath fit tightly, thereby sealing the gap between the sheath and the concrete, avoiding the existence of gas flow channels between the concrete and the side wall of the sheath due to concrete shrinkage, and further ensuring the sealing of the lower plate.

[0015] In an optional embodiment, a matching circular tightening part is also included. The outer diameter of the tightening part is smaller than the inner diameter of the upper sleeve and the lower sleeve, the outer diameter of the tightening part is larger than the inner diameter of the flexible ring, and the tightening part can be locked inside the flexible ring to compress the flexible ring through the tightening part.

[0016] In an alternative embodiment, the tightening portion has a necked structure along the axial direction of the sheath to ensure the stability of the tightening portion within the flexible ring.

[0017] In an optional embodiment, the tightening part is made of polytetrafluoroethylene to reduce the resistance when pressing the tightening part into the flexible ring.

[0018] In an optional embodiment, both the upper sleeve and the lower sleeve are PVC plastic pipes to facilitate the processing of the sheath and ensure its economic efficiency.

[0019] Secondly, the present invention provides a construction method for a suspended formwork structure for the lower slab of a double-layer roof in a barn, based on the aforementioned suspended formwork structure for the lower slab of a double-layer roof in a barn, comprising the following steps:

[0020] S10. Based on the dimensions of the flat warehouse and the spacing of the steel frame of the flat warehouse roof, erect a truss on the top of the flat warehouse.

[0021] S20. The sheath is fitted onto the lower end of the tie rod, and the sheath is fixed to the tie rod by squeezing the flexible ring in the middle of the sheath.

[0022] S30. Hang the tie rods on the corresponding positions of the truss through the hanging parts;

[0023] S40. Lift or pull the template to move it to the bottom of the frame at the top of the flat warehouse, and pass it through the reinforcing bar hole through the lower end of the corresponding sheath.

[0024] S50. Connect the support ring to the lower end of the tie rod, so that the lower end of the sheath is inserted into the middle of the support ring;

[0025] S60. Release the template so that the lower side of the template abuts against the upper end face of the support ring;

[0026] S70. Adjust the length of the corresponding tie rods according to the height of the lower slab of the flat warehouse and the coplanarity of the multiple templates, and complete the erection of the casting mold cavity for the lower slab of the flat warehouse.

[0027] S80. When the structural strength of the lower layer of the flat warehouse reaches the set value, the support ring is removed from the lower end of the tie rod, and the tie rod is pulled upward to remove the tie rod from the sheath.

[0028] S90. Push the tightening part into the sheath and engage it with the center of the flexible ring to seal the through hole of the sheath.

[0029] The present invention provides a construction method for the suspended formwork structure of the lower layer slab of a flat warehouse. First, according to the size of the flat warehouse and the spacing of the steel frame of the flat warehouse roof, a truss is erected on the top of the flat warehouse. Then, a sheath is fitted onto the lower end of the tie rod. The sheath is fixed to the tie rod by squeezing the flexible ring in the middle of the sheath through the tie rod. The tie rod is hung on the corresponding position of the truss through the hanging part. Then, the template is lifted or pulled to move the template to the bottom of the frame at the top of the flat warehouse. The template passes through the through hole of the tie rod through the lower end of the corresponding sheath. Then, the support ring is connected to the lower end of the tie rod, so that the lower end of the sheath is inserted into the middle of the support ring. Then, the template is released so that the lower side of the template abuts against the upper surface of the support ring. Finally, according to the height of the lower layer slab of the flat warehouse and the coplanarity of multiple templates, the length of the corresponding tie rod is adjusted to complete the erection of the casting mold cavity for the lower layer slab of the flat warehouse.

[0030] During the hoisting process, it is only necessary to attach the hoisting rods, lift / pull the formwork, and connect the support rings after passing the lower end of the hoisting rods through the formwork. The formwork installation is simple and convenient, which can significantly improve the erection efficiency of the lower slab formwork of the double-layer roof of the flat warehouse.

[0031] When the structural strength of the lower slab of the flat warehouse reaches the set value, the support ring is removed from the lower end of the tie rod, and the tie rod is pulled upwards and extracted from the sheath. No steel bars are exposed outside the lower slab of the double-layer roof of the flat warehouse, eliminating the need to cut steel bars, thus improving work efficiency and the construction environment. Finally, the expansion joint is pushed into the sheath and engaged in the middle of the flexible ring to seal the through hole of the sheath. Compared to protecting cut steel bars, this construction process is simple and highly efficient.

[0032] Therefore, the construction method for the suspended formwork structure of the lower layer slab of the double-layer roof of the flat warehouse provided by the present invention is simple and convenient to install, which can significantly improve the erection efficiency of the lower layer slab formwork of the double-layer roof of the flat warehouse. After the lower layer slab is poured, not only can the tie bars be quickly removed, but there are no exposed steel bars outside the lower layer slab of the double-layer roof of the flat warehouse, and there is no need to cut the steel bars, which can improve the work efficiency and improve the construction environment. Moreover, it can quickly seal the holes left after the tie bars are removed, thereby ensuring the airtightness of the lower layer slab.

[0033] The beneficial effects of this invention are:

[0034] 1. The suspended formwork structure for the lower layer of the double-layer roof of a flat warehouse provided by the present invention has a hanging part at the upper end of the suspension rod. It can be hung on the roof truss of the flat warehouse through the hanging part, and the suspension rod is vertically hung on the roof truss. The lower end of the suspension rod is provided with a protective sleeve and a support ring. The protective sleeve is fitted outside the suspension rod, and the support ring is detachably fitted on the lower end of the suspension rod. At the same time, a through hole is provided in the middle of the formwork, and the protective sleeve can be inserted into the through hole. At this time, by connecting the support ring to the lower end of the suspension rod, the lower side of the formwork can be abutted against the upper end of the support ring, thereby suspending the formwork under the roof truss without the need to support the formwork frame, thus avoiding the occupation of the scaffolding for a long time.

[0035] 2. The suspended formwork structure for the lower layer of the double-layer roof of a flat warehouse provided by the present invention only requires the connection of the suspension tie rod, the lifting / pulling of the formwork, and the connection of the support ring after the lower end of the suspension tie rod passes through the formwork. The installation of the formwork is simple and convenient, which can significantly improve the erection efficiency of the lower layer formwork for the double-layer roof of a flat warehouse.

[0036] 3. The formwork structure for the lower layer of a double-layer roof in a flat warehouse provided by this invention features a detachable connection between the sheath and the support ring and the tie rods. After the lower layer of the double-layer roof reaches the set structural strength, the support rings can be removed first, allowing the formwork to be dismantled and the tie rods to be pulled out from the sheath. No steel bars are exposed outside the lower layer of the double-layer roof, eliminating the need to cut steel bars, thus improving work efficiency and the construction environment. The sheath is embedded in the lower layer of the double-layer roof, and the sealing of the lower layer can be ensured simply by sealing the inner hole of the sheath with a sealing element. Compared to protecting cut steel bars, this construction process is simple and highly efficient.

[0037] 4. The present invention provides a construction method for the suspended formwork structure of the lower layer slab of a double-layer roof in a flat warehouse. Based on the aforementioned suspended formwork structure of the lower layer slab of a double-layer roof in a flat warehouse, it eliminates the need for formwork support, avoids prolonged occupation of scaffolding, and simplifies and facilitates formwork installation. This significantly improves the erection efficiency of the lower layer slab formwork for the double-layer roof in a flat warehouse. No steel bars are exposed outside the lower layer slab of the double-layer roof in a flat warehouse, eliminating the need for steel bar cutting. This improves work efficiency and the construction environment. Furthermore, the sealing performance of the lower layer slab of the double-layer roof in a flat warehouse can be ensured simply by sealing the inner hole of the sealing sleeve. It features simple construction process, high construction efficiency, and high sealing performance of the lower layer slab. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. The dimensions of the corresponding parts and the proportions between the parts in the particular drawings are only for easier understanding of the technical solutions and differ from the actual dimensions and proportions used.

[0039] In the attached diagram:

[0040] Figure 1 This is a schematic diagram of the suspended formwork structure of the lower layer of the double-layer roof of the flat warehouse according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the sheath after it is inserted into the tightening part according to an embodiment of the present invention.

[0042] The attached diagram shows the markings and corresponding component names:

[0043] Tie rod, 1a-pin hole, 2-template, 3-hanging part, 4-protective sleeve, 4a-upper sleeve body, 4b-lower sleeve body, 4c-flexible ring, 5-support ring, 6-sealing ring, 7-turnbuckle nut, 8-limiting pin, 9-tightening part. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] In the description of the embodiments of this application, the terms "center," "upper," "lower," "left," "right," "vertical," "longitudinal," "lateral," "horizontal," "inner," "outer," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. At the same time, unless otherwise expressly specified and limited, the terms "set," "open," "installed," "connected," and "linked" should be interpreted broadly. Example

[0047] Combination Figure 1This embodiment provides a suspended formwork structure for the lower layer of a double-layer roof of a flat warehouse, including multiple tie rods 1 and multiple templates 2. The upper end of each tie rod 1 is provided with a connecting part 3, which is used to connect with the roof truss of the flat warehouse. The lower end of each tie rod 1 is provided with a sheath 4 and a support ring 5. The sheath 4 is detachably fitted over the tie rod 1, and the support ring 5 is detachably fitted over the lower end of the tie rod 1. The upper end of the support ring 5 is provided with a stepped hole, and the lower end of the sheath 4 is detachably inserted into the large-diameter end of the stepped hole. The large-diameter end of the stepped hole is provided with a sealing ring 6, which seals the gap between the side wall of the stepped hole and the outer wall of the sheath 4, and the upper end of the sealing ring 6 protrudes from the support ring 5. A through-rib hole is provided in the middle of each template 2, and the sheath 4 passes through the through-rib hole, with the lower side of the template 2 abutting against the upper surface of the support ring 5.

[0048] It is understood that the tie rod 1 can be a fixed-length steel bar component or an adjustable-length assembly, both of which can be manufactured in the workshop as needed. In this embodiment, a turnbuckle nut 7 is provided between the tie rod 1 and the connecting part 3; the upper end of the turnbuckle nut 7 is screwed to the connecting part 3, and the lower end of the turnbuckle nut 7 is screwed to the upper end of the tie rod 1. By rotating the turnbuckle nut 7, the distance between the tie rod 1 and the connecting part 3 can be adjusted. On the one hand, this facilitates the adjustment of the height of the template 2; on the other hand, it ensures the coplanarity of multiple templates 2, so that the lower layer of the double-layer roof of the flat warehouse has a high degree of flatness, avoiding the lower layer of the double-layer roof of the flat warehouse from exerting lateral forces on the walls of the flat warehouse.

[0049] The connection between the support ring 5 and the tie rod 1 can be achieved through methods such as nut connection, pin connection, or snap-fit / ring connection. In this embodiment, the lower end of the tie rod 1 is provided with a pin hole 1a, which extends radially along the tie rod 1. A limiting pin 8 is movably inserted into the pin hole 1a, with both ends of the limiting pin 8 protruding from the tie rod 1. The upper side of the limiting pin 8 abuts against the lower side of the support ring 5. Through the cooperation of the limiting pin 8 and the pin hole 1a, the support ring 5 can be quickly restricted to the lower end of the tie rod 1, and the support ring 5 can also be quickly removed from the tie rod 1.

[0050] Preferably, the pin hole 1a is an elongated hole along the length of the tie rod 1, so that the limiting pin 8 can be rotated along the length of the pin hole 1a, ensuring that the limiting pin 8 has sufficient contact area with the template 2, and preventing the limiting pin 8 from damaging the template 2 during pouring.

[0051] In addition, to facilitate sealing the inner hole of the sheath 4, in this embodiment, the sheath 4 includes an upper sleeve 4a and a lower sleeve 4b, with a flexible ring 4c provided between the upper sleeve 4a and the lower sleeve 4b; the upper end of the flexible ring 4c is fixedly connected to the lower end of the upper sleeve 4a, and the lower end of the flexible ring 4c is fixedly connected to the upper end of the lower sleeve 4b; the outer diameter of the flexible ring 4c is greater than or equal to the outer diameter of the upper sleeve 4a or the lower sleeve 4b, the inner diameter of the flexible ring 4c is smaller than the inner diameter of the upper sleeve 4a or the lower sleeve 4b, and the inner diameter of the flexible ring 4c is larger than the outer diameter of the tie rod, so as to seal the through hole of the sheath 4 by squeezing the flexible ring 4c, and at the same time, squeezing the flexible ring 4c makes the concrete outside the sheath 4 tightly adhere to the flexible ring 4c, thereby sealing the gap between the sheath 4 and the concrete, avoiding the gas flow channel between the concrete and the side wall of the sheath 4 due to the shrinkage of the concrete, and further ensuring the sealing of the lower plate.

[0052] Typically, both the upper sleeve 4a and the lower sleeve 4b are PVC plastic pipes to facilitate the processing of the sheath 4 and ensure its economic efficiency. The connection between the upper sleeve 4a, the lower sleeve 4b, and the flexible ring 4c can be achieved through snap-fitting, bonding, welding, or other methods.

[0053] Combination Figure 2 This embodiment also includes a matching circular tightening part 9. The outer diameter of the tightening part 9 is smaller than the inner diameter of the upper sleeve 4a and the lower sleeve 4b. The outer diameter of the tightening part 9 is larger than the inner diameter of the flexible ring 4c. The tightening part 9 can be locked inside the flexible ring 4c so as to squeeze the flexible ring 4c through the tightening part 9.

[0054] Furthermore, along the axial direction of the sheath 4, the tightening part 9 has a constricted structure to ensure the stability of the tightening part 9 within the flexible ring 4c.

[0055] Optionally, the material of the tightening part 9 is polytetrafluoroethylene (PTFE), so as to utilize the self-lubricating properties of PTFE to reduce the resistance when pressing the tightening part 9 into the flexible ring 4c.

[0056] The formwork structure for the lower slab of the double-layer roof of the flat warehouse provided in this embodiment is connected to the roof truss of the flat warehouse through the hanging part 3 during construction. The tie rod 1 is vertically hung on the roof truss. The lower end of the tie rod 1 is provided with a protective sleeve 4 and a support ring 5. The protective sleeve 4 is fitted outside the tie rod 1, and the support ring 5 is detachably fitted on the lower end of the tie rod 1. At the same time, the middle of the formwork 2 is provided with a through hole, and the protective sleeve 4 can be inserted into the through hole. At this time, by connecting the support ring 5 to the lower end of the tie rod 1, the lower side of the formwork 2 can be abutted against the upper end of the support ring 5, thereby suspending the formwork 2 under the roof truss without the need to support the formwork frame, thus avoiding the occupation of the scaffolding for a long time.

[0057] Therefore, during the hoisting process, it is only necessary to attach the hoisting rod 1, lift / pull the template 2, and connect the support ring 5 after passing the lower end of the hoisting rod 1 through the template 2. The installation of the template 2 is simple and convenient, which can significantly improve the erection efficiency of the template 2 of the lower layer of the double-layer roof of the flat warehouse.

[0058] The support ring 5 has a stepped hole at its upper end, and the lower end of the sheath 4 is detachably inserted into the large-diameter end of the stepped hole. A sealing ring 6 is provided at the large-diameter end of the stepped hole to seal the gap between the side wall of the stepped hole and the outer wall of the sheath 4, preventing concrete mortar from seeping between the support ring 5 and the sheath 4, thus avoiding leakage and hindering the disassembly of the support ring 5. Simultaneously, the upper end of the sealing ring 6 protrudes from the support ring 5, and the gap between the support ring 5 and the template 2 is sealed by pressing down on the sealing ring 6, thereby preventing mortar leakage between the support ring 5 and the template 2.

[0059] Furthermore, since both the sheath 4 and the support ring 5 are detachably connected to the tie rod 1, after the lower layer of the double-layer roof of the flat warehouse reaches the set structural strength, the support ring 5 can be removed first, allowing the formwork 2 to be dismantled and the tie rod 1 to be pulled out from the sheath 4. No steel bars are exposed outside the lower layer of the double-layer roof of the flat warehouse, eliminating the need to cut steel bars, thus improving work efficiency and the construction environment. The sheath 4 is embedded in the lower layer of the double-layer roof of the flat warehouse; simply sealing the inner hole of the sheath 4 with a sealant ensures the airtightness of the lower layer of the double-layer roof of the flat warehouse. Compared to protecting cut steel bars, the construction process is simple and efficient.

[0060] In summary, the formwork structure for the lower slab of the double-layer roof of the flat warehouse provided in this embodiment is simple and convenient to install, which can significantly improve the erection efficiency of the formwork 2 for the lower slab of the double-layer roof of the flat warehouse. After the lower slab is poured, the tie rods 1 can be quickly removed, and no steel bars are exposed outside the lower slab of the double-layer roof of the flat warehouse. There is no need to cut the steel bars, which can improve work efficiency and improve the construction environment. Moreover, the holes left after the tie rods 1 are removed can be quickly sealed, thereby ensuring the airtightness of the lower slab. Example

[0061] Combination Figure 1 This embodiment provides a construction method for a suspended formwork structure of the lower slab of a double-layer roof in a flat warehouse. Based on the suspended formwork structure of the lower slab of a double-layer roof in a flat warehouse described in Embodiment 1, the method includes the following steps:

[0062] S10. Based on the dimensions of the flat warehouse and the spacing of the steel frame of the flat warehouse roof, erect a truss on the top of the flat warehouse.

[0063] S20. The sheath 4 is fitted onto the lower end of the tie rod 1, and the sheath 4 is fixed to the tie rod by the tie rod 1 pressing the flexible ring 4c in the middle of the sheath 4.

[0064] S30. The tie rod 1 is hung on the corresponding position of the truss through the hanging part 3.

[0065] S40. Lift or pull up the template 2, move the template 2 to the bottom of the frame at the top of the flat warehouse, and pass it through the reinforcing bar hole through the lower end of the corresponding protective sleeve 4.

[0066] It is understandable that when erecting formwork 2, it can be hoisted using lifting equipment, such as tower cranes, overhead cranes, or hoists, to place formwork 2 in the designated position, or it can be lifted using lifting equipment, such as scissor lift platforms or lifting trucks. During lifting, multiple formwork 2 sections can be lifted at once, thus improving the efficiency of formwork 2 erection.

[0067] S50. Connect the support ring 5 to the lower end of the tie rod 1, so that the lower end of the sheath 4 is inserted into the middle of the support ring 5.

[0068] S60. Release the template 2 so that the lower side of the template 2 abuts against the upper surface of the support ring 5.

[0069] S70. Based on the height of the lower slab of the flat warehouse and the coplanarity of the multiple templates 2, adjust the length of the corresponding tie rods 1, and complete the erection of the casting mold cavity for the lower slab of the flat warehouse.

[0070] S80. When the structural strength of the lower layer of the flat warehouse reaches the set value, the support ring 5 is removed from the lower end of the tie rod 1, and the tie rod 1 is pulled upward to extract the tie rod 1 from the sheath 4.

[0071] S90. Push the tightening part 9 into the sheath 4 and engage it in the middle of the flexible ring 4c to seal the through hole of the sheath 4.

[0072] In other words, the construction method of the suspended formwork structure for the lower layer of the double-layer roof of the flat warehouse provided in this embodiment firstly involves erecting a truss on the top of the flat warehouse according to the size of the flat warehouse and the spacing of the steel frame of the flat warehouse roof. Then, the sheath 4 is fitted onto the lower end of the tie rod 1. The sheath 4 is fixed to the tie rod by squeezing the flexible ring 4c in the middle of the sheath 4 through the tie rod 1. The tie rod 1 is hung on the corresponding position of the truss through the hanging part 3. Then, the template 2 is lifted or pulled to move the template 2 to the bottom of the frame at the top of the flat warehouse. The template 2 passes through the through hole of the corresponding sheath 4 at the lower end. The support ring 5 is then connected to the lower end of the tie rod 1 so that the lower end of the sheath 4 is inserted into the middle of the support ring 5. Then, the template 2 is released so that the lower side of the template 2 abuts against the upper surface of the support ring 5. Finally, the length of the corresponding tie rod 1 is adjusted according to the height of the lower layer of the flat warehouse and the coplanarity of multiple templates 2, thus completing the erection of the casting mold cavity for the lower layer of the flat warehouse.

[0073] During the hoisting process, it is only necessary to attach the hoisting rod 1, lift / pull the template 2, and connect the support ring 5 after passing the lower end of the hoisting rod 1 through the template 2. The installation of the template 2 is simple and convenient, which can significantly improve the erection efficiency of the template 2 of the lower layer of the double-layer roof of the flat warehouse.

[0074] When the structural strength of the lower slab of the flat warehouse reaches the set value, the support ring 5 is removed from the lower end of the tie rod 1, and the tie rod 1 is pulled upwards and pulled out of the sheath 4. No steel bars are exposed outside the lower slab of the double-layer roof of the flat warehouse, eliminating the need to cut steel bars, thus improving work efficiency and the construction environment. Finally, the tightening part 9 is pushed into the sheath 4 and engaged in the middle of the flexible ring 4c to seal the through hole of the sheath 4. Compared to protecting the cut steel bars, this construction process is simple and highly efficient.

[0075] Therefore, the construction method for the suspended formwork structure of the lower layer slab of the double-layer roof of the flat warehouse provided in this embodiment is simple and convenient to install, which can significantly improve the erection efficiency of the formwork 2 of the lower layer slab of the double-layer roof of the flat warehouse. After the lower layer slab is poured, not only can the tie rod 1 be quickly removed, but there is no exposed steel bar outside the lower layer slab of the double-layer roof of the flat warehouse, and there is no need to cut the steel bar, which can improve the work efficiency and improve the construction environment. Moreover, it can quickly seal the holes left after the tie rod 1 is removed, thereby ensuring the airtightness of the lower layer slab.

[0076] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A suspended formwork structure for the lower slab of a double-layered roof in a flat warehouse, characterized in that, Includes multiple tie rods (1) and multiple formwork (2); The upper end of the tie rod (1) is provided with a hook part (3), which is used to hook with the roof truss of the flat warehouse; The lower end of the tie rod (1) is provided with a sleeve (4) and a support ring (5). The sleeve (4) is detachably sleeved on the tie rod (1), and the support ring (5) is detachably sleeved on the lower end of the tie rod (1). The upper end of the support ring (5) is provided with a stepped hole, and the lower end of the sheath (4) is detachably inserted into the large diameter end of the stepped hole. A sealing ring (6) is provided at the large diameter end of the stepped hole. The sealing ring (6) can seal the gap between the side wall of the stepped hole and the outer wall of the sheath (4), and the upper end of the sealing ring (6) protrudes from the support ring (5). The template (2) is provided with a through hole in the middle, the sheath (4) is inserted into the through hole, and the lower side of the template (2) abuts against the upper end face of the support ring (5). The sheath (4) includes an upper sleeve (4a) and a lower sleeve (4b), and a flexible ring (4c) is provided between the upper sleeve (4a) and the lower sleeve (4b). The upper end of the flexible ring (4c) is fixedly connected to the lower end of the upper sleeve (4a), and the lower end of the flexible ring (4c) is fixedly connected to the upper end of the lower sleeve (4b). The outer diameter of the flexible ring (4c) is greater than or equal to the outer diameter of the upper sleeve (4a) or the lower sleeve (4b), the inner diameter of the flexible ring (4c) is smaller than the inner diameter of the upper sleeve (4a) or the lower sleeve (4b), and the inner diameter of the flexible ring (4c) is greater than the outer diameter of the tie rod. It also includes a matching circular expansion part (9), the outer diameter of which is smaller than the inner diameter of the upper sleeve (4a) and the lower sleeve (4b), the outer diameter of which is larger than the inner diameter of the flexible ring (4c), and the expansion part (9) can be locked inside the flexible ring (4c).

2. The suspended formwork structure for the lower slab of the double-layer roof of a flat warehouse according to claim 1, characterized in that, A basket nut (7) is provided between the tie rod (1) and the hanging part (3). The upper end of the basket nut (7) is screwed to the hanging part (3), and the lower end of the basket nut (7) is screwed to the upper end of the suspension rod (1). The distance between the suspension rod (1) and the hanging part (3) can be adjusted by rotating the basket nut (7).

3. The formwork structure for the lower slab of the double-layer roof of a flat warehouse according to claim 2, characterized in that, The lower end of the tie rod (1) is provided with a pin hole (1a), which extends radially along the tie rod (1); A limiting pin (8) is movably inserted into the pin hole (1a). Both ends of the limiting pin (8) can protrude from the tie rod (1), and the upper side of the limiting pin (8) abuts against the lower side of the support ring (5).

4. The suspended formwork structure for the lower slab of the double-layer roof of a flat warehouse according to claim 3, characterized in that, Along the length of the tie rod (1), the pin hole (1a) is an elongated hole.

5. The suspended formwork structure for the lower slab of the double-layer roof of a flat warehouse according to claim 1, characterized in that, Along the axial direction of the sheath (4), the tightening part (9) has a constricted structure.

6. The suspended formwork structure for the lower slab of the double-layer roof of a flat warehouse according to claim 1, characterized in that, The material of the expansion part (9) is polytetrafluoroethylene.

7. The suspended formwork structure for the lower slab of the double-layer roof of a flat warehouse according to claim 1, characterized in that, Both the upper sleeve (4a) and the lower sleeve (4b) are PVC plastic pipes.

8. A construction method for a suspended formwork structure for the lower slab of a double-layered roof in a barn, based on the suspended formwork structure for the lower slab of a double-layered roof in a barn as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S10. Based on the dimensions of the flat warehouse and the spacing of the steel frame of the flat warehouse roof, erect a truss on the top of the flat warehouse. S20. The sheath (4) is fitted onto the lower end of the tie rod (1), and the sheath (4) is fixed to the tie rod by the tie rod (1) pressing the flexible ring (4c) in the middle of the sheath (4); S30. Hang the tie rod (1) on the corresponding position of the truss through the hanging part (3); S40. Lift or pull up the template (2) to move the template (2) to the bottom of the frame at the top of the flat warehouse and pass through the reinforcing bar hole through the lower end of the corresponding sleeve (4); S50. Connect the support ring (5) to the lower end of the tie rod (1) so that the lower end of the sheath (4) is inserted into the middle of the support ring (5); S60. Release the template (2) so that the lower side of the template (2) abuts against the upper surface of the support ring (5); S70. Based on the height of the lower floor of the flat warehouse and the coplanarity of the multiple templates (2), adjust the length of the corresponding tie rods (1) and complete the erection of the casting mold cavity for the lower floor of the flat warehouse. S80. When the structural strength of the lower layer of the flat warehouse reaches the set value, the support ring (5) is removed from the lower end of the tie rod (1), and the tie rod (1) is pulled upward to pull the tie rod (1) out of the sheath (4). S90. Push the tightening part (9) into the sheath (4) and engage it in the middle of the flexible ring (4c) to seal the through hole of the sheath (4).

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