An internal wall bracing device and method for shrinkable positioning assembly

Abstract

This invention discloses an internal wall support device and method for retractable positioning assembly. The support device includes a cylindrical main body with a hollow cylindrical mounting frame on its exterior. The mounting frame is coaxial with the main body, and its surface is uniformly provided with multiple axial hollow grooves. A movable block is slidably connected to each hollow groove. The side of the movable block away from the hollow groove is hinged to one end of a small rod, and the other end of the small rod is hinged to a sheet-like support structure. Adjacent sheet-like support structures overlap to form a ring-shaped support surface. The position of the small rod near the sheet-like support structure is hinged to one end of a tie rod, and the other end of the tie rod passes through the hollow groove and is then hinged to a push-pull ring. The push-pull ring is sleeved on the main body and can move axially relative to the main body. This invention is compact, has an adjustable diameter, sufficient support strength, is easy to demold, and produces smooth hole walls after demolding, thus improving the quality of precast beams.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated component preparation technology, and relates to an internal wall support device and method for retractable positioning assembly. Background Technology

[0002] Precast beams with openings are commonly used in large-scale construction projects. The support of these openings during the pouring process is a seemingly minor issue that is easily overlooked. Traditional methods are often used for support, but these are uneconomical and can sometimes cause damage. For example, plastic or steel pipes are used for opening support during concrete pouring. Figure 1 As shown; however, during the final demolding, the molds inside the holes are often difficult to remove due to the hardening of the concrete, requiring construction workers to spend time on this task. The molds inside the holes need to be removed in one direction, unlike other external wall support formwork which is easier to dismantle, so even applying a release agent does not guarantee easy removal. On-site construction workers typically pull the molds out forcefully or remove them before the concrete hardens, which damages the strength and integrity of the components. When the internal molds cannot be removed, the precast components cannot be used, resulting in significant waste of manpower and resources and impacting the construction progress.

[0003] Existing support structures and demolding methods are not conducive to dismantling and cannot be applied to holes that vary within a certain range. When the dimensions are different, construction workers need to find steel pipes of suitable size for internal support, and they cannot be reused. Dismantling may also result in damage due to forceful pulling. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an internal wall support device for retractable positioning assembly. It is compact, has an adjustable diameter, sufficient support strength, is easy to demold, and produces smooth and flat hole walls after demolding, thereby improving the quality of precast beams and solving the problems existing in the prior art.

[0005] Another object of the present invention is to provide a support method for an internal wall support device for retractable positioning assembly.

[0006] The technical solution adopted in this invention is an internal wall support device for retractable positioning assembly, comprising a cylindrical main body, a hollow cylindrical mounting frame on the outside of the main body, the mounting frame being coaxial with the main body, and multiple axial hollow grooves evenly distributed on the surface of the mounting frame, with a movable block slidably connected to each hollow groove, the side of the movable block away from the hollow groove being hinged to one end of a small rod, the other end of the small rod being hinged to a plate-like support structure, adjacent plate-like support structures overlapping each other to form a ring-shaped support surface; the position of the small rod near the plate-like support structure is hinged to one end of a pull rod, the other end of the pull rod passing through the hollow groove and then hinged to a push-pull ring; the push-pull ring is sleeved on the main body and can move axially relative to the main body.

[0007] Furthermore, when the push-pull ring moves outward axially relative to the main body, it drives the small rod to move outward near the plate-shaped support structure via the pull rod. The small rod rotates around the hinge axis relative to the moving block. The hinge axis is tangent to the arc surface of the mounting frame. The rotation surface of the small rod passes through the axis of the main body, causing the plate-shaped support structure to contract radially along the main body while moving outward.

[0008] Furthermore, each of the movable blocks is hinged to two ends along the main body axis with small rods. When the diameter of the annular support surface is at its maximum, the sheet-like support structure, the two small rods, and the movable block form a rectangle. When the diameter of the annular support surface decreases, the sheet-like support structure, the two small rods, and the movable block form a parallelogram, and the overlapping part between the sheet-like support structures gradually increases.

[0009] Furthermore, each of the sheet-like support structures includes a crescent-shaped rigid solid sheet and an arc-shaped flexible sandwich sheet composed of two layers of solid sheets, with the rigid solid sheet and the flexible sandwich sheet distributed at intervals. When the annular support surface needs to contract radially along the main body, the rigid solid sheet gradually enters the sandwich layer of the flexible sandwich sheet. When the annular support surface needs to extend radially along the main body, the rigid solid sheet gradually exits the sandwich layer of the flexible sandwich sheet. When the radial extension reaches its maximum, the sharp hooks at the ends of the rigid solid sheet and the flexible sandwich sheet cooperate with each other to restrict the rigid solid sheet from completely exiting.

[0010] Furthermore, the thickness of the rigid solid sheet is 1-3 mm; the elastic modulus of the flexible sandwich sheet is 172-206 GPa, and the thickness is 1-3 mm.

[0011] Furthermore, the main body surface is provided with two rows of scale lines along the axial direction, which correspond to the diameter of the annular support surface and the depth of the hole, respectively.

[0012] Furthermore, the main body has axially extending overlapping cylinders at both ends, the bottom of which is supported by a bracket, and the bottom of the bracket is equipped with a height-adjustable horizontal saddle-shaped tripod for fixing the two ends of the device.

[0013] Furthermore, when the push-pull ring is pushed to a certain position, it is fixed by a locking buckle to restrict its movement.

[0014] Furthermore, the axis of the main body is collinear with the center line of the hole.

[0015] A method for supporting an internal wall support device for retractable positioning assembly includes the following steps:

[0016] S1, Place the device into the hole and fix it in place, so that the axis of the main body is collinear with the center line of the hole;

[0017] S2, Move the push-pull ring; when the ring wall support surface reaches the required hole size, fix the push-pull ring; then pour concrete.

[0018] S3, when dismantling the mold, release the fixing of the push-pull ring, move the push-pull ring, the ring wall support surface retracts inward, and remove the device from the hole.

[0019] The beneficial effects of this invention are:

[0020] 1. This invention provides a retractable and positionable inner wall support for precast beam openings. It utilizes thin steel sheets wound into a ring to form a ring-shaped support, effectively supporting the opening. Each steel sheet overlaps tightly, providing sufficient strength and excellent support. Connected to the outermost members by internal and external rods, the outermost ring can be effectively contracted. After the concrete hardens, it contracts inward, allowing the device to be easily removed from the inside. This solves the problem of demolding small-diameter inner walls (applicable range 80mm-120mm) and ensuring a smooth inner wall after demolding, significantly improving the precast quality of the precast beam openings.

[0021] 2. This invention can adapt to different apertures and is easy to disassemble; it is compact and does not take up much space; the internal components cooperate with each other, making it easy to manufacture, low in cost, energy-saving and environmentally friendly; and after one batch of supports is used up, it can be reused in the next batch of prefabricated components, making it reusable. Combined with engineering practice, it has high practical value.

[0022] 3. This invention has a positioning and measurement function. During manufacturing, it can accurately measure the diameter and length of the hole, providing actual measurement data for subsequent construction. After assembly, small supports are provided at both ends to ensure accurate positioning. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 It is a prefabrication drawing of a precast beam with holes.

[0025] Figure 2 This is a schematic diagram of the structure of a precast beam with holes in an embodiment of the present invention.

[0026] Figure 3 This is a structural schematic diagram of an embodiment of the present invention.

[0027] Figure 4 This is a structural schematic diagram from another perspective of an embodiment of the present invention.

[0028] Figure 5a This is a cross-sectional view of an embodiment of the present invention.

[0029] Figure 5b yes Figure 5a A schematic diagram of the push-pull ring after it has moved outward.

[0030] Figure 6 This is a schematic diagram of the connection between the thin rod and the small rod in an embodiment of the present invention.

[0031] Figure 7 This is an assembly diagram of the steel sheet in a contracted state in an embodiment of the present invention.

[0032] Figure 8 This is an assembly diagram of the steel sheet in the open state in an embodiment of the present invention.

[0033] Figure 9 This is a detailed view of the steel sheet in an embodiment of the present invention.

[0034] Figure 10 This is a schematic diagram of the latch structure in an embodiment of the present invention.

[0035] Figure 11 This is a schematic diagram of the tripod structure in an embodiment of the present invention.

[0036] Figure 12 This is a schematic diagram of the steel sheet structure in an embodiment of the present invention.

[0037] Figure 13 This is a schematic diagram of the scale in an embodiment of the present invention.

[0038] In the diagram, 1. Precast beam, 2. Hole, 3. Sheet support structure, 4. Track, 5. Small rod, 6. Push-pull ring, 7. Tie rod, 8. Pulley, 9. Hollow groove, 10. Rigid solid sheet, 11. Flexible sandwich sheet, 12. Hook, 13. Screw, 14. Lock, 15. Bracket, 16. Height adjustment structure, 17. Scale line, 18. Tripod, 19. Moving block, 20. Mounting bracket, 21. Level tube. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1,

[0041] An internal wall support device for retractable positioning assembly, such as Figure 3-4As shown, it includes a cylindrical main body, and a hollow cylindrical mounting frame 20 is provided on the outside of the main body. The mounting frame 20 is coaxial with the main body. The surface of the mounting frame 20 is evenly provided with 12 axial hollow grooves 9. A moving block 19 is slidably connected to each hollow groove 9. The side of the moving block 19 away from the hollow groove 9 is hinged to one end of a small rod 5. The other end of the small rod 5 is hinged to a plate-shaped support structure 3. The connection between the small rod 5 and the plate-shaped support structure 3 is a hinge. Specifically, the small rod 5 is connected to the plate-shaped support structure 3 through a hinge block. The small rod 5 is hinged to the hinge block, and the hinge block is fixedly connected to the plate-shaped support structure 3.

[0042] The small rod 5 and the movable block 19 are hinged and can rotate around an axis. They can move but cannot be extended or shortened. However, they can be replaced with longer or shorter rods by disassembly. The movement of the small rod 5, the plate-shaped support structure 3, and the movable block 19 can be simplified to the movement of a parallelogram mechanism. The small rod 5 is driven by the pull rod 7, and the plate-shaped support structure 3 connected to it also moves accordingly.

[0043] Adjacent sheet-like support structures 3 overlap to form a ring-wall support surface; the small rod 5 is hinged to one end of the tie rod 7 near the sheet-like support structure 3, and the other end of the tie rod 7 passes through the hollow groove 9 and is then hinged to the push-pull ring 6; the push-pull ring 6 is sleeved on the main body and can move axially relative to the main body, and the number and position of the tie rod 7 correspond to the hollow groove 9.

[0044] The end of the mounting bracket 20 furthest from the push-pull ring 6 is fixedly connected to the main body. The radial force of the plate-shaped support structure 3 is mainly transmitted to the main body through the pull rod 7, and some force is transmitted to the mounting bracket 20 through the small rod 5. These forces are relatively small, and the mounting bracket 20 only needs a certain thickness to provide support. The axial dimension of the mounting bracket 20 is 25cm. If it is too long, the pushing and pulling of the push-pull ring 6 will be restricted, which will affect the length of the main body and make the instrument too bulky.

[0045] like Figures 5a-5b and Figure 6 As shown, a pulley 8 is installed on the side of the movable block 19 near the hollow groove 9. The movable block 19 is slidably connected to the track 4 on the opposite side of the port of the hollow groove 9 through the pulley 8. When the push-pull ring 6 moves, the 12 connecting rods 7 connected to it also move together. During the movement, the inclination of the connecting rods 7 will change, thereby causing the whole to deform. When the push-pull ring 6 moves outward, it drives the connecting rods 7 to move outward, which in turn drives the two small rods 5 connected to the thin steel sheet to move. The plate-shaped support structure 3, the two small rods 5 and the movable block 19 form a parallelogram, which causes the plate-shaped support structure 3 to shrink radially along the main body and move outward at the same time. The overlapping parts between the various plate-shaped support structures 3 also increase. Due to the close contact, it is similar to forming a support wall.

[0046] The angle between the pull rod 7 and the axis of the main body is determined according to the opening diameter, and is within 6°-12°. Because the push-pull ring 6 is connected to other rods, it will not exceed this range; otherwise, the device will deform and its performance will be reduced.

[0047] Based on the position of the push-pull ring 6, the opening and closing size can be calculated, or the diameter reading of the ring wall support surface can be read from the scale on the other side of the main body. The depth of hole 2 can be read directly from the scale on the main body of the device. The scale lines 17 corresponding to the diameter reading and the depth of hole 2 are distributed in two rows; Figure 13 This corresponds to a portion of the hole 2 depth readings.

[0048] like Figure 11 As shown, the main body has axially extending overlapping cylinders at both ends. The bottom of the overlapping cylinders is supported by a bracket 15. A height-adjustable horizontal saddle-shaped tripod 18 is installed at the bottom of the bracket 15 to fix the two ends of the device. Specifically, the height of the bracket 15 is adjusted by a height adjustment structure 16, which includes multiple elastic protrusions of different heights. The tripod 18 includes two parts that can be interlocked. The elastic protrusions of different heights are provided in the interlocking part of the upper part of the tripod 18, and the elastic protrusions pass through the through holes provided in the lower part of the tripod 18.

[0049] After opening to a certain size, to prevent loosening during maintenance, when the push-pull ring 6 is pushed to a certain position, it is fixed by the locking buckle 14; the locking buckle 14 is generally hung on the overlapping cylinder, and when the push-pull ring needs to be fixed, tightening the bolts will secure the device. Specifically, such as Figure 10 As shown, two semi-circular fasteners are used, with one end of each fastener hinged together and the other end fixed by screws 13. When the push-pull ring 6 is pushed to a certain position, the semi-circular ring is fastened and fixed by screws 13, so that the whole structure no longer changes.

[0050] After the concrete has hardened, remove the device, open the latch 14, and slowly pull the tie rod 7 outward, causing the internal small rod 5 to retract. This achieves easy demolding, resulting in a precast beam 1 with holes 2; unlike ordinary methods, it does not require tapping the mold for demolding.

[0051] The upper surface of the overlapping cylinder has a level tube 21 with a water column, which can test whether the device is on a straight line. When the testing device is on a straight line, the water column in the level tube 21 will fall in a section in the middle of the level tube 21, making the axis of the main body collinear with the center line of the hole 2. The straight line direction is the direction of the line connecting the central axes of the main body, which must be parallel to the center line of the hole 2. This ensures that the hole 2 is not uneven and avoids deviation.

[0052] In some embodiments, such as Figure 12As shown, the adjacent sheet-like support structure 3 is a thin steel sheet similar to a tile. The thin steel sheets overlap and are tightly connected like tiles, featuring detachability and assembly. The sheet-like support structure 3 includes a crescent-shaped, arc-shaped, closed steel sheet with a certain thickness and strength (rigid solid sheet 10) and an arc-shaped steel sheet layer (flexible sandwich sheet 11) composed of a double-layer solid sheet with slight flexibility (elastic modulus 172-206 GPa, Poisson's ratio 0.3). The double-layer solid sheets are parallel to each other and fixedly connected in the middle, without affecting the insertion of the rigid solid sheet 10. The rigid solid sheet 10 and the flexible sandwich sheet 11 are distributed alternately; when the device retracts, the rigid solid sheet 10 slowly enters the sandwich of the flexible sandwich sheet 11; when the device opens to its maximum limit, the ends of both types of steel sheets will have sharp hooks 12, such as... Figure 8-9 As shown. The functions of the hook 12 are: first, to restrict the rigid solid piece 10 from sliding out of the flexible sandwich piece 11; and second, to prevent concrete from entering through very fine gaps, thus ensuring excellent support performance of the device. This hook 12 is relatively small compared to the rigid solid piece 10 and the flexible sandwich piece 11 (the hook 12 is 1mm long and has a 45° inclination angle), and will not affect the flatness of the connection. The thickness of the flexible sandwich piece 11 ranges from 1-3mm, exceeding the highest elastic modulus range. It has high material stiffness, is not easily deformed, and is more brittle, requiring a larger force to be applied during extension, but this brittleness can lead to failure. If the minimum elastic modulus is not reached, it is easily deformed. The thickness of the rigid solid piece 10 ranges from 1-3mm, has a smooth surface, is free of cracks and bubbles, has good weldability, and possesses sufficient support strength.

[0053] According to the above dimensions, the diameter of the annular support surface varies from 80mm to 120mm in this embodiment of the invention. Larger, more detailed components (small rods 5 and plate-like support structures 3) can also be disassembled and replaced to increase the required diameter (120-160mm).

[0054] When the sheet-like support structure 3 contracts radially along the main body and moves outward, the diameter of the annular support surface decreases. During this process, the curvature / radius of the support surface changes, but the radius of each rigid solid sheet 10 or flexible sandwich sheet 11 (sheet-like support structure 3) remains fixed. The number of sheet-like support structures 3 and their specific structure in this embodiment of the invention can overcome the above problems. 12-16 sheet-like support structures 3 are set. If the number of sheet-like support structures 3 is too small, the size of each solid sheet increases, and the strength and support effect will decrease. If the number is too large, it is uneconomical.

[0055] The overall size of this invention is small, with a cleverly designed internal structure. The connections between the components fit together perfectly, and the arc shape provides the strongest compressive strength, dispersing the pressure from the concrete. This is supported by overlapping arc-shaped steel plates, and the force on these plates is transmitted to the main body through the rods. Simultaneously, the push-pull ring is secured with a locking mechanism, providing double protection and ensuring both diameter adjustment and sufficient support strength. Tests have shown that the device of this invention significantly increases the support strength. Furthermore, while the flatness of concrete structures poured using conventional methods is 5-8mm, this invention reduces the flatness to within 5mm. The number of air bubbles and cracks in the pore walls of the formed concrete is reduced by 50%, resulting in a significant improvement in quality.

[0056] An embodiment of the present invention provides a support method for an internal wall support device for retractable positioning assembly:

[0057] S1, place the device into the hole 2, set up the supports on both sides to fix the device, and balance the water column in the level tube 21.

[0058] S2, move the push-pull ring 6, when the ring wall support surface reaches the required size of the hole 2, then fix it with the lock 14; then pour concrete.

[0059] S3, when disassembling the mold, open the latch 14, move the push-pull ring 6, the ring wall support surface retracts inward, and remove the device from the hole 2, obtaining as shown. Figure 2 The precast beam shown.

[0060] The application scenario of this invention is the support of precast beams 1 with holes 2 or other components that require openings. The cross-section of the holes 2 is circular, which has strong applicability, reduces material consumption, and allows for recycling.

[0061] The above description is merely a preferred 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 are included within the scope of protection of the present invention.

Claims

1. An internal wall bracing device for shrinkable positioning assembly, characterised in that, The system includes a cylindrical main body, with a hollow cylindrical mounting frame (20) on the outside of the main body. The mounting frame (20) is coaxial with the main body. The surface of the mounting frame (20) is evenly provided with multiple axial hollow grooves (9). A movable block (19) is slidably connected to each hollow groove (9). The side of the movable block (19) away from the hollow groove (9) is hinged to one end of a small rod (5). The other end of the small rod (5) is hinged to a plate-shaped support structure (3). Adjacent plate-shaped support structures (3) overlap each other to form a ring wall support surface. The position of the small rod (5) near the plate-shaped support structure (3) is hinged to one end of a pull rod (7). The other end of the pull rod (7) passes through the hollow groove (9) and is then hinged to a push-pull ring (6). The push-pull ring (6) is sleeved on the main body and can move axially relative to the main body. Each of the sheet-like support structures (3) includes a crescent-shaped rigid solid sheet (10) and an arc-shaped flexible sandwich sheet (11) composed of two solid sheets. The rigid solid sheet (10) and the flexible sandwich sheet (11) are distributed at intervals. When the annular support surface needs to shrink radially along the main body, the rigid solid sheet (10) gradually enters the sandwich of the flexible sandwich sheet (11). When the annular support surface needs to extend radially along the main body, the rigid solid sheet (10) gradually exits the sandwich of the flexible sandwich sheet (11). When the radial extension reaches its maximum, the hooks (12) at the ends of the rigid solid sheet (10) and the flexible sandwich sheet (11) cooperate with each other to restrict the rigid solid sheet (10) from completely exiting. The thickness of the rigid solid sheet (10) is 1-3 mm; the elastic modulus of the flexible sandwich sheet (11) is 172-206 GPa and the thickness is 1-3 mm. The main body surface is provided with two rows of scale lines (17) along the axial direction, which correspond to the diameter of the annular support surface and the depth of the hole (2), respectively; When the push-pull ring (6) is pushed to a certain position, the push-pull ring (6) is fixed by the latch (14) to restrict the movement of the push-pull ring (6).

2. The internal wall support device for retractable positioning assembly according to claim 1, characterized in that, When the push-pull ring (6) moves outward relative to the axial direction of the main body, the pull rod (7) drives the small rod (5) to move outward close to the plate-shaped support structure (3). The small rod (5) rotates around the hinge axis relative to the moving block (19). The hinge axis is tangent to the arc surface of the mounting frame (20). The rotation surface of the small rod (5) passes through the axis of the main body, causing the plate-shaped support structure (3) to contract radially along the main body and move outward at the same time.

3. The internal wall support device for retractable positioning assembly according to claim 1, characterized in that, Each of the movable blocks (19) is hinged with small rods (5) at both ends along the main axis. When the diameter of the annular support surface is at its maximum, the sheet support structure (3), the two small rods (5) and the movable block (19) form a rectangle. When the diameter of the annular support surface decreases, the sheet support structure (3), the two small rods (5) and the movable block (19) form a parallelogram, and the overlapping part between the sheet support structures (3) gradually increases.

4. The internal wall support device for retractable positioning assembly according to claim 1, characterized in that, The main body has axially extending overlapping cylinders at both ends. The bottom of the overlapping cylinders is supported by a bracket (15). The bottom of the bracket (15) is equipped with a height-adjustable horizontal saddle-shaped tripod (18) for fixing the two ends of the device.

5. The internal wall support device for retractable positioning assembly according to claim 1, characterized in that, The axis of the main body is collinear with the center line of the hole (2).

6. The support method for an internal wall support device for retractable positioning assembly as described in claim 1, characterized in that, Includes the following steps: S1, Place the device into the hole (2) and fix it so that the axis of the main body is collinear with the center line of the hole (2); S2, move the push-pull ring (6), when the ring wall support surface reaches the required size of the hole (2), fix the push-pull ring (6); and pour concrete. S3, when dismantling the mold, release the fixing of the push-pull ring (6), move the push-pull ring (6), the ring wall support surface retracts inward, and take the device out of the hole (2).

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