Formwork support device for building deformation joint

Abstract

The utility model relates to the field of building construction technology, specifically disclose a kind of formwork device at building deformation joint, including support unit and drive unit, the support unit includes: first support plate and second support plate, the first support plate and second support plate are mutually parallel and symmetrically arranged;Groove, the groove is provided with multiple, and respectively set up in the outside of the first support plate and second support plate, the device is driven tightly by groove clamping and top bolt, so that device can be realized stable anchoring without complex external support in narrow space, ensure that formwork stress is uniform, effectively prevent the expansion mode and the leakage of serum;Meanwhile, the screw rod adjusting mechanism based on thread self-locking makes device can reliably maintain set spacing after pouring, and can quickly contract when formwork is removed so as to be integrally extracted, realize the convenient installation, stable reinforcement and efficient turnover in narrow space, significantly improve the construction quality and efficiency at deformation joint.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a formwork support device for building expansion joints. Background Technology

[0002] Traditional expansion joint construction typically employs a phased construction procedure. First, one side of the expansion joint is formwork erected and poured. After pouring, the other side is then reinforced with formwork and poured. During formwork erection, holes are typically drilled in advance according to the locations of the tie bolt holes. Square timber is used on the outside of the formwork at the expansion joint to install vertical and horizontal back bracing. The tie bolts pass through the holes in the formwork and back bracing, and are tightened using nuts and washers.

[0003] In existing technologies, such as those disclosed in patent document CN214195533U, there exists an adjustable template system for the construction of small-sized expansion joints. This system mainly consists of a screw with positive and negative threaded sections, a mating nut, hinged tension plates, and steel templates serving as the forming surface. Vertical multi-segment splicing is achieved through connecting sleeves. Its working principle involves rotating the screw to drive the tension nut to move, which in turn opens and closes a scissor mechanism composed of tension plates, thereby adjusting the spacing between the steel templates on both sides. This solution is primarily applied to the construction of narrow expansion joints in vertical structures such as shear walls, aiming to solve the problem of setting up and dismantling templates in confined spaces.

[0004] However, this existing technical solution still has significant limitations in practical applications: its main support structure relies on steel formwork and multiple sets of hinged connecting rods, resulting in a large overall weight. On-site installation often requires the assistance of lifting equipment such as tower cranes, leading to insufficient operational flexibility and high requirements for construction sites and conditions. The system's method of fixing the formwork is inadequate—either relying solely on the friction between the steel formwork and the concrete surface, which easily leads to slippage during pouring and vibration, affecting the molding quality; or still requiring additional tie rods to penetrate the structural wall for connection, which not only necessitates pre-embedding sleeves in the reinforcing steel, affecting structural integrity, but also increases the complexity of assembly and disassembly and reliance on manual operation. The system has many components, requiring on-site assembly through methods such as hinged ear plates and connecting sleeves, rather than being an integrated whole tool, resulting in cumbersome assembly and disassembly procedures and low turnover efficiency. The aforementioned device focuses on wall construction; its structural adaptability and operational convenience are still lacking for supporting and quickly positioning expansion joints in horizontal components such as beams. These shortcomings restrict its widespread application in modern building construction that pursues high efficiency, high quality, and reusability. Utility Model Content

[0005] The purpose of this utility model is to provide a formwork support device for building expansion joints, so as to solve the problems of the prior art mentioned in the background art, such as the equipment being bulky and dependent on lifting equipment, the formwork being not firmly fixed and easy to slip or requiring destructive tensioning, the on-site assembly being cumbersome and inefficient, and the difficulty in applying it to horizontal components such as beams.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a formwork support device for building expansion joints, comprising a support unit and a drive unit. The support unit includes: a first support plate and a second support plate, the first and second support plates being parallel and symmetrically arranged; a groove, wherein multiple grooves are provided and respectively opened on the outer sides of the first and second support plates, the grooves being used to engage and fix square timber; through holes, wherein several through holes are arranged in pairs on two of the first and second support plates, and each through hole has a threaded post rotatably connected to the first and second support plates, one end of the threaded post being tightened against the inner wall of the first and second support plates by a nut; a first telescopic arm and a second telescopic arm, one end of two of the first and second telescopic arms being cross-hinged by two through pins, and the other end being rotatably sleeved on the outer side of the threaded post.

[0007] In one feasible implementation, the drive unit includes: a screw, which is movably connected to one of the through pins; and a connecting shaft, which is fixedly connected to another through pin and has an internal thread on its inner wall that mates with the external thread of the screw.

[0008] In one feasible implementation, the driving unit further includes a driving handle, and one end of the screw has an operating hole through which the driving handle passes. The driving handle and the operating hole are interlocked to drive the screw to rotate.

[0009] In one feasible implementation, a template positioning structure is also included, the template positioning structure comprising: a fixing plate, wherein a plurality of fixing plates are respectively fixedly disposed at the ends of the first support plate and the second support plate; and a tightening bolt, wherein a plurality of tightening bolts are respectively threadedly connected to a plurality of fixing plates, and one end of each bolt faces the groove.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This device forms an initial position through a support plate with a groove and a square timber inserted therein. The telescopic arm assembly is driven by a screw to synchronously and precisely adjust the distance between the two support plates to closely adapt to expansion joints of different widths. After adjustment, the engagement of the groove of the support plate and the square timber provides the main friction fixation, while the tightening bolts threaded to the fixed sealing plate can be further screwed in to actively tighten the square timber from the side, thereby applying additional clamping force on the basis of the groove engagement, forming a rigid overall constraint. The dual fixing mechanism (groove engagement and active tightening of the tightening bolts) enables the device to achieve stable anchoring in a narrow space without complex external support, ensuring uniform stress on the template and effectively preventing formwork bulging and grout leakage. At the same time, the screw adjustment mechanism based on the threaded self-locking allows the device to reliably maintain the set spacing after pouring and can be quickly retracted for overall extraction during demolding, realizing convenient installation, stable reinforcement and efficient turnover in a narrow space, significantly improving the construction quality and efficiency at the expansion joint. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 This is a schematic diagram of the tightening bolt of this utility model; Figure 3 This is a front view of the present invention.

[0012] In the figure: 1. First support plate, 2. Second support plate, 3. Groove, 4. Tightening bolt, 5. Threaded post, 6. Screw, 7. Connecting shaft, 8. First telescopic arm, 9. Second telescopic arm, 10. Through pin, 11. Drive handle, 12. Operating hole, 13. Fixed sealing plate. Detailed Implementation

[0013] 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.

[0014] Please see Figures 1 to 3This utility model provides a technical solution for a formwork support device at a building expansion joint, comprising a support unit and a drive unit. The support unit includes: a first support plate 1, a second support plate 2, a groove 3, a through hole, a first telescopic arm 8, and a second telescopic arm 9. The first support plate 1 and the second support plate 2 are parallel to each other and symmetrically arranged. Multiple grooves 3 are provided and are respectively opened on the outer side of the first support plate 1 and the second support plate 2. The grooves 3 are used to engage and fix square timber. Several through holes are arranged in pairs and are respectively opened on the two first support plates 1 and the second support plate 2. Each through hole is provided with a threaded post 5 rotatably connected to the first support plate 1 and the second support plate 2. One end of the threaded post 5 is tightened against the inner wall of the first support plate 1 and the second support plate 2 by a nut. One end of the two first telescopic arms 8 and the second telescopic arms 9 are cross-hinged by two through pins 10, and the other end is rotatably sleeved on the outer side of the threaded post 5.

[0015] It should be noted that during construction, the outer side of the template on both sides of the expansion joint is not shown in the diagram. The vertical square timber backing is installed according to conventional procedures. The device is vertically placed into the expansion joint, aligning the grooves on the first support plate 1 and the second support plate 2 and engaging the square timber backing. The grooves 3 on the outer sides of the first support plate 1 and the second support plate 2 are also aligned and initially engaged with the square timber on the outer side of the template. Since the first telescopic arm 8 and the second telescopic arm 9 are cross-hinged through two through pins 10, when the user controls the screw 6 to rotate, the linear displacement output by the screw 6 acts on the connecting shaft 7. Through threaded engagement with the connecting shaft 7, the through pin 10 connected to the connecting shaft 7 moves to the other through pin 10, causing the first telescopic arm 8 and the second telescopic arm 9 to rotate about the threaded post 3. Simultaneously, the first telescopic arm 8 and the second telescopic arm 9 generate… The rotational force is directly transmitted to the threaded post 5, which is rotatably fitted onto it. After being subjected to force, the threaded post 5 rotates in the through holes opened on the first support plate 1 and the second support plate 2. Since the threaded post 5 and the through hole are rotatably connected, and one end of the threaded post 5 is tightened against the side wall of the support plate by a nut to limit its axial movement, the rotation of the threaded post 5 will be converted into parallel and symmetrical opposite or back-to-back movement between the first support plate 1 and the second support plate 2, thereby realizing stepless adjustment of the formwork spacing. When the spacing is adjusted to match the width of the expansion joint, the groove 3 on the outside of the support plate will be tightly engaged with the square timber to form a stable support interface that relies on friction to self-lock, thereby completing the fixation of the templates on both sides.

[0016] The threaded post 5 has a dual function: it passes through the through holes on the first support plate 1 and the second support plate 2 and is locked at one end by a nut, thereby detachably fixing the telescopic arm assembly to the first support plate 1 and the second support plate 2; the threaded post 5 serves as a rotating shaft, providing rotational support for the ends of the first telescopic arm 8 and the second telescopic arm 9.

[0017] In some examples, the drive unit further includes a screw 6 and a connecting shaft 7. The screw 6 is movably connected to one of the through pins 10; the connecting shaft 7 is fixedly connected to the other through pin 10, and its inner wall is provided with an internal thread that mates with the external thread of the screw 6. When an external rotational drive is applied to the screw 6, the external thread of the screw 6 meshes with the internal thread on the inner wall of the connecting shaft 7, causing the screw 6 to rotate. The rotational motion of the screw 6 is directly converted into a relative linear displacement between the screw 6 and the connecting shaft 7 along their axial direction. This axial relative displacement is then synchronously transmitted to the first telescopic arm 8 and the second telescopic arm 9, thereby driving the first support plate 1 and the second support plate 2 to open or close. Through the self-locking characteristic of the screw 6's thread itself, the current relative position can be automatically locked after the drive stops, ensuring that the support spacing remains stable when subjected to external loads.

[0018] In some examples, the drive unit further includes a drive handle 11. One end of the screw 6 has an operating hole 12 through which the drive handle 11 passes. The drive handle 11 and the operating hole 12 are interlocked to drive the screw 6 to rotate. The drive handle 11, as an external manual operating component, is inserted into the operating hole 12 at the end of the screw 6. By applying rotational force, the drive handle 11 drives the screw 6 to rotate around its own axis. The rotation of the screw 6 is converted into an axial linear displacement relative to the connecting shaft 7 through engagement with the internal thread of the connecting shaft 7. This linear displacement is transmitted to the telescopic arm assembly through the movable connection point between the screw 6 and the through pin 10, thereby driving the support plate to complete the spacing adjustment.

[0019] In some examples, the template positioning structure further includes: a fixed sealing plate 13 and a tightening bolt 4, wherein a plurality of fixed sealing plates 13 are respectively fixedly disposed at the ends of the first support plate 1 and the second support plate 2; a plurality of tightening bolts 4 are respectively threadedly connected to a plurality of fixed sealing plates 13, and one end of each bolt faces the groove 3. The fixed sealing plate 13 is fixed to the end of the support plate, providing a stable support and installation platform for the tightening bolt 4. After the first support plate 1 and the second support plate 2 are initially inserted into the square timber through the groove 3 and the spacing is adjusted, the tightening bolt 4 can be further tightened. One end of the bolt pushes forward and tightly abuts against the side of the square timber, thereby providing additional normal pressure, increasing friction, and forming a double insurance to prevent relative slippage between the device and the square timber during concrete pouring and vibration. The operator uses a tool to tighten the tightening bolt 4 threaded on the fixed sealing plate 13. Driven by the thread, the bolt moves straight along its axis towards the groove 3. One end of the tightening bolt 4 then gradually abuts against and presses into the surface of the square timber that has been inserted into the groove 3. The axial pressure applied continuously generates additional friction and lateral constraint, thereby achieving secondary reinforcement and precise positioning of the square timber based on the engagement of the groove 3, ultimately ensuring that the formwork does not shift or loosen during the pouring process.

[0020] The detailed working process of this device is as follows: The device is vertically inserted into the expansion joint of the pre-installed square timber back brace, causing the grooves 3 on the outer sides of the first support plate 1 and the second support plate 2 to engage with the square timber. Then, the drive handle 11 is inserted into the operating hole 12 at the end of the screw 6 and rotated. The drive handle 11 drives the screw 6 to rotate. Since the screw 6 is threadedly engaged with the connecting shaft 7, and the connecting shaft 7 is fixedly connected to the through pin 10, the rotation of the screw 6 is converted into axial movement relative to the through pin 10. The through pin 10 forces the cross-hinged first telescopic arm 8 and the second telescopic arm 9 to open and close. The swinging of the first telescopic arm 8 and the second telescopic arm 9 drives the connecting threaded post 5, which is fixedly connected to its end, to move, thereby changing the axial distance between the two connecting threaded posts 5. Since the first support plate 1 and the second support plate 2 are sleeved on the connecting threaded post 5 through smooth through holes and can slide axially, they are forcibly driven, achieving precise adjustment of the distance between the first support plate 1 and the second support plate 2 on both sides. After adjustment to the required width, the groove 3 engages tightly with the square timber. To further reinforce the structure, tighten the top bolt 4 in the template positioning structure so that one end presses against the side of the square timber, forming a double fixation.

[0021] In the description of this utility model, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," and "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. At the same time, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "fixed installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction relationship between two elements. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A formwork support device for building expansion joints, characterized in that, It includes a support unit and a drive unit, wherein the support unit includes: The first support plate (1) and the second support plate (2) are parallel to each other and symmetrically arranged. The groove (3) is provided in multiple ways and is respectively opened on the outside of the first support plate (1) and the second support plate (2). The groove (3) is used to engage and fix with the square timber. Through holes, a number of through holes are arranged in pairs and are respectively opened on the two first support plates (1) and the second support plate (2). Each through hole is provided with a threaded post (5) rotatably connected to the first support plate (1) and the second support plate (2). One end of the threaded post (5) is pressed against the inner wall of the first support plate (1) and the second support plate (2) by a nut. The first telescopic arm (8) and the second telescopic arm (9) are connected at one end by two through pins (10) and the other end is rotatably sleeved on the outside of the threaded column (5).

2. The formwork support device for building expansion joints according to claim 1, characterized in that: The driving unit includes: Screw (6), said screw (6) being movably connected to one of the through pins (10); The connecting shaft (7) is fixedly connected to another through pin (10), and its inner wall is provided with an internal thread that mates with the external thread of the screw (6).

3. The formwork support device for building expansion joints according to claim 2, characterized in that: The drive unit also includes a drive handle (11), and one end of the screw (6) is provided with an operation hole (12) through which the drive handle (11) passes. The drive handle (11) and the operation hole (12) are connected to each other to drive the screw (6) to rotate.

4. The formwork support device for building expansion joints according to claim 3, characterized in that: It also includes a template positioning structure, which includes: Fixed sealing plates (13), a plurality of the fixed sealing plates (13) are respectively fixedly disposed at the ends of the first support plate (1) and the second support plate (2); Tightening bolts (4), a plurality of the tightening bolts (4) are respectively threaded onto a plurality of the fixing plates (13), and one end of each plate faces the groove (3).

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