Building expansion joint outer formwork system

Abstract

An outer formwork system of a building expansion joint comprises two outer formworks arranged on the two side faces of the building expansion joint in parallel. Baffles are arranged on the upper portion and the lower portion of the outer side face of the outer formwork in the length direction, a plurality of nut seats are evenly arranged on the outer side face of each baffle, through holes are formed in the positions, corresponding to the nut seats, of the baffles, lead screws are arranged between the corresponding through holes and the nut seats in a sleeved mode, the inner ends of the lead screws extend out of the inner formwork, and tightening nuts are arranged on the extending portions of the inner ends of the lead screws. A plurality of detachable transverse rods are connected between the upper end faces of the two outer formworks at equal intervals. The upper ends of the outer formworks on the two side faces of the expansion joint in the formwork system are connected through the detachable cross rods, after lower-layer construction is completed and the lead screws are pulled out, the two outer formworks can be integrally lifted upwards to the upper layer through the detachable cross rods, the construction procedure is simplified, the workload is reduced, and the construction quality and efficiency of the expansion joint can be improved.

Description

Technical Field

[0001] The utility model relates to the field of building templates, in particular to an outer template system for building expansion joints. Background Art

[0002] Expansion joints are a common design element in construction projects. They are primarily used to address the expansion and contraction of buildings due to temperature fluctuations, wind, earthquakes, and other factors. Expansion joints are typically placed at predicted deformation points in the building structure to reduce cracks and damage caused by deformation while maintaining the building's structural integrity and safety. In architectural design, the proper placement of expansion joints can effectively reduce damage caused by thermal expansion and contraction, as well as other factors, and is a key measure to ensure the long-term stability and durability of buildings.

[0003] The space for expansion joints in buildings is relatively small, so during the pouring construction process, there is a problem that there is not enough space for the external formwork to install, making it difficult to install. Moreover, after the construction of the lower expansion joint of a multi-story building is completed, the external formwork needs to be disassembled and removed as a whole, and then transferred to the expansion joint position of the upper floor for reassembly and fixation. Repeated disassembly and assembly as well as upward transfer result in a cumbersome construction process and a large workload, which restricts the construction efficiency of the contraction joint. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes an outer formwork system for a building expansion joint.

[0005] The technical solution of the utility model is: a building expansion joint outer formwork system, comprising two outer formworks arranged parallel to each other on two side surfaces of the building expansion joint, and the two outer formworks are symmetrically arranged; baffles are provided on the upper and lower parts of the outer side surfaces of the outer formworks in a square shape along their lengths, and the upper and lower baffles are arranged parallel to each other, and a plurality of nut seats are evenly provided on the outer side surfaces of the baffles, and through holes are provided at positions corresponding to the baffles and the nut seats, and a screw rod is fitted between the corresponding through holes and the nut seats, and the screw rod can be selected as a water-stop screw rod, and the screw rod can slide freely in the through hole, and the inner end of the screw rod extends from the inner formwork, and a tightening nut is provided on the protruding part of the inner end of the screw rod; a plurality of detachable cross bars are connected at equal intervals between the upper end surfaces of the two outer formworks.

[0006] Preferably, the outer template includes several aluminum plates connected to each other, and docking plates are provided on the edges of the aluminum plates. Docking holes are provided on the docking plates, and pins are inserted between the docking holes. The outer ends of the pins are provided with limiting holes, and limiting pins are inserted into the limiting holes.

[0007] Preferably, the outer side surface of the aluminum plate body is provided with reinforcing ribs in a grid shape, both ends of the reinforcing ribs extend to the edge of the aluminum plate body, and the reinforcing ribs cover the outer side surface of the aluminum plate body.

[0008] Preferably, plugs are provided at both ends of the detachable cross bar along the radial direction. The plugs are welded and fixed at both ends of the detachable cross bar to ensure the overall stability. The plugs at both ends are inserted into the docking holes of the docking plates at the upper ends of the outer formworks on both sides in a matching manner, and a limiting block is provided at the lower end of the plug.

[0009] Preferably, the limiting block is a limiting nut connected to the plug by a thread or a pin piece inserted into a pin hole provided on the plug. A thread is provided at the lower part of the plug, and the limiting nut is connected to the plug by the thread.

[0010] Preferably, the baffle is a channel steel plate, which is fixedly connected to the outer side of the outer formwork. The bottom surface of the channel steel plate is welded and fixed to the outer formwork, and the nut seat is arranged in the groove of the channel steel plate.

[0011] Preferably, the nut seat includes a square seat body and a nut body integrally connected to the center of the square seat body. A through hole communicating with the nut body is provided at the center of the square seat body, and the size of the square seat body matches the size of the groove of the channel steel plate.

[0012] Preferably, a backing plate is installed between the nut at the inner end of the screw rod and the inner formwork. A round hole is provided at the center of the backing plate, and the screw rod passes through the round hole.

[0013] The beneficial technical effects of the present utility model are as follows:

[0014] (1) The nut seat of the present utility model is connected to the outer formwork as an integral structure through the channel steel plate. During use, the screw rod can be screwed out from the nut seat of the outer formwork or inserted into the nut seat of the outer formwork in the building body, and the disassembly or installation and fixation of the outer formwork can be simply and efficiently realized.

[0015] (2) The upper ends of the outer formworks on both sides of the expansion joint of the present utility model are connected to each other through the detachable cross bar. After the lower layer construction is completed and the screw rod is withdrawn, the two outer formworks can be lifted upward as a whole to the upper layer through the detachable cross bar, which simplifies the construction process, reduces the workload, and is conducive to improving the construction quality and efficiency of the expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present utility model in the use state;

[0017] Figure 2 is a top view structural schematic diagram of the present utility model in the use state;

[0018] Figure 3 is Figure 2 the sectional structural schematic diagram taken along the A-A direction of

[0019] Figure 4 is Figure 3 the partial enlarged view of

[0020] Figure 5 yes Figure 2 BB-direction cross-sectional structural diagram;

[0021] Figure 6 It is a structural schematic diagram of the utility model in which the lower layer construction is completed and lifted upward to proceed to the next layer construction.

[0022] In the figure, 11. Building body, 12. Aluminum plate body, 121. Docking plate, 122. Docking hole, 123. Reinforcement rib, 13. Inner template, 14. Nut seat, 141. Square seat body, 142. Nut body, 15. Screw, 151. Tightening nut, 16. Removable cross bar, 161. Plug, 162. Limit nut, 17. Channel steel plate. DETAILED DESCRIPTION

[0023] Example 1, see the attached Figures 1-3 A building expansion joint outer formwork system includes two outer formworks arranged parallel to each other on both sides of the building expansion joint. The upper and lower outer sides of the outer formworks are both provided with baffles along their lengths. The baffles serve as top pressure plates for the outer formworks and are also used to reinforce the outer formworks. Several nut seats 14 are evenly arranged on the outer side surfaces of the baffles. Through holes are provided at positions corresponding to the baffles and the nut seats. A screw rod 15 is set between the corresponding through holes and the nut seats 14. The inner end of the screw rod extends from the inner formwork 13, and a tightening nut 151 is provided at the protruding part of the inner end of the screw rod 15. When the formwork system is in use, the construction workers can screw the screw rod 15 inside the building body 11 to pull it out of the nut seat 14 of the outer formwork, or insert it into the nut seat 14 of the outer formwork, and lock the screw rod 15 at the inner end by tightening the nut 151, so as to simply and efficiently realize the disassembly or installation of the outer formwork.

[0024] The outer template includes several aluminum plates 12 connected to each other. The edges of the aluminum plates are provided with docking plates 121, and docking holes 122 are provided on the docking plates. Pins are inserted between the docking holes to fix the aluminum plates 12 into one body.

[0025] The outer surface of the aluminum plate 12 is provided with a grid-like reinforcement rib 123. The reinforcement rib 123 covers the outer surface of the aluminum plate 12. The grid-like reinforcement rib 123 improves the deformation resistance of the aluminum plate 12, thereby resisting the pressure generated by pouring concrete and ensuring the pouring quality. A backing plate is installed between the nut at the inner end of the screw rod 15 and the inner formwork 13 to protect the inner formwork 13.

[0026] Example 2, see the attached Figure 3 、 5, this embodiment is basically the same as the first embodiment, except that the baffle is a channel steel plate 17. The two side plates of the channel steel plate are designed with relatively small height dimensions to avoid occupying a large expansion joint space. The channel steel plate 17 is fixedly connected to the outer side of the outer formwork. The nut seat 14 is arranged in the groove of the channel steel plate 17. The nut seat 14 includes a square seat body 141 and a nut body 142 integrally connected to the center of the square seat body 141. The nut seat 14 has relatively high structural strength and stability and can withstand a large pulling force of the lead screw 15. The size of the square seat body 141 matches the size of the groove of the channel steel plate 17.

[0027] The channel steel plate 17 of this embodiment can clamp the square seat body 141 to provide a limit for the nut seat 14. When the lead screw 15 is screwed, the screwing force of the lead screw will not drive the nut seat 14 to rotate continuously, ensuring the tightening force and pulling force of the lead screw 15 and improving the firmness of the installation of the outer formwork.

[0028] Embodiment Three, see the attached drawings of the specification Figures 2-4 , this embodiment is basically the same as the first embodiment, except that a number of detachable crossbars 16 are connected at equal intervals between the upper end faces of the two outer formworks. The equally spaced detachable crossbars fixedly connect the two side outer formworks into one body. The detachable crossbar 16 serves as a hanging bar for the overall lifting of the outer formwork system. Plug heads 161 are provided at both ends of the detachable crossbar 16 in the radial direction. The plug heads are welded and fixed to the detachable crossbar 16 as a whole. The plug heads 161 at both ends are inserted into the docking holes 122 of the docking plates 121 at the upper ends of the two side outer formworks. A limit block is provided at the lower end of the plug head. The limit block is a limit nut 162 connected to the plug head 161 by a thread or a pin piece inserted into the pin hole provided on the plug head 161. A limit block is formed at the lower end of the plug head through the limit nut 162 or the pin piece.

[0029] When the outer formwork system in this embodiment is lifted upward at the expansion joint for upper-layer construction, first connect the lifting hook of the crane to the detachable crossbar 16 between the two side outer formworks. Then, the construction workers sequentially loosen each tightening nut 151 inside the building body 11, screw the lead screw 15 to separate its outer end from the nut seat 14 on the side of the outer formwork, and sequentially pull out each lead screw 15. The outer formwork is separated from the wall of the expansion joint and is in a free state. Then, the outer formwork system is lifted upward to the construction position of the expansion joint on the upper layer through the detachable crossbar 16. This formwork system can simplify the construction process, reduce the construction workload, and improve the construction quality of the expansion joint at the same time.

Claims

1. A formwork system for building expansion joints, characterized in that: It includes two outer templates with the two side faces on both sides of the building expansion joint arranged parallel to each other; baffles are provided along the length direction on the upper and lower parts of the outer side faces of the outer templates, several nut seats are evenly arranged on the outer side faces of the baffles, through holes are provided at the positions corresponding to the nut seats on the baffles, screw rods are sleeved between the corresponding through holes and the nut seats, the inner ends of the screw rods extend out from the inner templates, and tightening nuts are provided on the extending parts of the inner ends of the screw rods; several detachable cross bars are connected at equal intervals between the upper end faces of the two outer templates.

2. The external formwork system for building expansion joints according to claim 1, characterized in that: The outer template mentioned above includes several interconnected aluminum plate bodies, butt plates are provided at the edge parts around the aluminum plate bodies, and butt holes are provided on the butt plates.

3. The external formwork system for building expansion joints according to claim 2, characterized in that: Reinforcing rib plates are arranged in a grid shape on the outer side face of the aluminum plate body, and the reinforcing rib plates cover the outer side face of the aluminum plate body.

4. A formwork system for building expansion joints according to claim 2, characterized in that: Plugs are provided along the radial direction at both ends of the detachable cross bar, the plugs at both ends are inserted into the butt holes of the butt plates at the upper ends of the outer templates on both sides in a matching manner, and limit blocks are provided at the lower ends of the plugs.

5. The external formwork system for building expansion joints according to claim 4, characterized in that: The limit block is a limit nut connected to the plug by a thread or a pin piece inserted into a pin hole provided on the plug.

6. The external formwork system for building expansion joints according to claim 1, characterized in that: The baffle is a channel steel plate, the channel steel plate is fixedly connected to the outer side face of the outer template, and the nut seat is arranged in the groove body of the channel steel plate.

7. The external formwork system for building expansion joints according to claim 6, characterized in that: The nut seat includes a square seat body and a nut body integrally connected to the center part of the square seat body, and the size of the square seat body matches the size of the groove body of the channel steel plate.

8. A formwork system for building expansion joints according to claim 1, characterized in that: A backing plate is installed between the nut at the inner end of the screw rod and the inner template.

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