A leakage-proof slurry counter-pulling rod

Abstract

The utility model discloses a kind of anti-leakage slip to pull rod, it is related to the technical field of assembled building mould accessory, to solve the gap between traditional pull rod and mould hole, resulting in concrete pouring leakage, cause the quality defect of the water loss of concrete forming surface around hole, sandification, depression etc.,;The pull rod includes screw rod and the pull rod body of sleeve joint in screw rod outside, screw rod is used to connect inner mould and outer mould, pull rod body is passed through the mounting hole of outer mould, screw rod end is passed through the through hole of inner mould and is threadedly connected with the fixed nut of inner mould inside;Sealing mechanism and limiting mechanism are equipped outside pull rod body, sealing mechanism is used to block mounting hole and through hole, limiting mechanism is used to limit the position of outer mould.The utility model realizes gap efficient plugging by double sealing structure, avoid leakage problem, while guarantee the fixed distance between inner mould and outer mould, concrete is once formed without repair, hole is neat and beautiful, adapt to the use demand of MIC module etc. assembled building mould.

Description

Technical Field

[0001] This utility model relates to the technical field of prefabricated building mold accessories, and more specifically, to a grout-proof tie rod. Background Technology

[0002] With the rapid development of industrialized construction, prefabricated concrete structures have been widely used in urban residential construction due to their advantages such as environmentally friendly construction and short construction cycle. MIC modules, as prefabricated building components with higher integration, have become an important development direction in the construction field. During the construction of MIC module molds, in order to resist the large pressure borne by the inner and outer molds during concrete pouring and to prevent mold bulging, tie rods need to be installed on the molds to hold the inner and outer molds in place.

[0003] However, when using traditional tie rods, they need to pass through holes made on the outer side of the inner and outer molds. Inevitably, gaps will exist between the tie rod and the holes. These gaps are prone to grout leakage during concrete vibration, resulting in quality defects such as water loss, sanding, depressions, and color differences on the concrete forming surface around the holes. This affects the appearance quality and structural stability of building components, and additional manpower and resources are required for repairs, increasing construction costs and time. Therefore, there is an urgent need for a technical solution that can efficiently seal the gaps between the tie rod and the mold holes to solve the grout leakage problem. Utility Model Content

[0004] This invention aims to solve the problem that gaps exist between the traditional tie rod and the mold hole, causing grout leakage during concrete pouring and resulting in quality defects such as water loss, sanding, and depressions on the concrete forming surface around the hole.

[0005] To address the aforementioned problems, this utility model provides a leak-proof tie rod, comprising a screw and a tie rod body sleeved on the outside of the screw and moving with the screw, used to connect an inner mold and an outer mold. The outer mold has an installation hole, through which the tie rod body passes. The inner mold has a through hole, through which the end of the screw passes. A fixing nut is fixed inside the inner mold, and the screw is threadedly connected to the fixing nut. A sealing mechanism and a limiting mechanism are provided on the outside of the tie rod body. The sealing mechanism is used to seal the installation hole and the through hole, and the limiting mechanism is used to limit the position of the outer mold.

[0006] The anti-leakage grout tie rod provided by this utility model has the following beneficial effects compared with the prior art: To address the problem of gaps between traditional tie rods and mold holes, leading to grout leakage during concrete pouring and quality defects such as water loss, sanding, and depressions on the concrete surface around the holes, the tie rod installation method involves passing the tie rod body and screw together through the mounting hole on the outer mold. Simultaneously, the end of the screw is passed through the through hole on the inner mold, and the screw is rotated so that its threaded end connects to the fixing nut inside the inner mold. As the screw rotates, the tie rod body moves along with it until the end of the tie rod body closest to the inner mold is in contact with the outer side of the inner mold. At this point, the limiting mechanism on the outside of the tie rod body also restricts the outer mold to a suitable position, ensuring that the distance between the inner and outer molds maintains a fixed wall thickness. Furthermore, the sealing mechanism on the outside of the tie rod body can seal the mounting hole of the outer mold and the through hole of the inner mold, effectively preventing water loss, sanding, and depressions on the concrete surface around these holes during concrete pouring, resulting in better performance.

[0007] Furthermore, a stop block is fixedly installed at the end of the screw away from the inner mold, and the outer diameter of the stop block is larger than the inner diameter of the pull rod body.

[0008] Furthermore, the sealing mechanism includes a grooved plate fixedly installed on the outer wall of the pull rod body, wherein an elastic rubber strip is provided in the groove of the grooved plate, and the thickness of the elastic rubber strip is greater than the groove depth of the grooved plate.

[0009] Furthermore, an annular groove is provided at one end of the pull rod body near the inner mold, and a sealing ring is provided in the annular groove, the thickness of which is greater than the depth of the annular groove.

[0010] Furthermore, when the pull rod is installed in place, the elastic rubber strip is tightly fitted to the inner side of the outer mold, and the sealing rubber ring is tightly fitted to the outer side of the inner mold.

[0011] Furthermore, the limiting mechanism includes a limiting plate fixedly installed on the outer wall of the tie rod, a reinforcing rib plate fixedly installed on the inner side of the outer mold, and a channel steel fixedly installed on the outer side of the reinforcing rib plate. When the tie rod is installed in place, the limiting plate and the channel steel are in contact.

[0012] Furthermore, the outer diameter of the portion of the tie rod located between the inner and outer molds gradually decreases from the outer mold towards the inner mold.

[0013] Furthermore, the elastic rubber strip and the sealing ring are made of rubber, and the cross-section of the elastic rubber strip and the sealing ring is rectangular or circular.

[0014] Furthermore, the fixing nut is fixed to the inner mold by welding, and the axis of the fixing nut coincides with the axis of the through hole of the inner mold.

[0015] Furthermore, the stop block is integrally formed with the screw or fixed by a threaded connection, and the cross-section of the stop block is circular or regular hexagonal. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a grout-proof tie rod according to an embodiment of the present utility model; Figure 2 for Figure 1 Enlarged structural diagram at point A in the diagram; Figure 3 This is a schematic diagram of the screw and tie rod body in an anti-leakage tie rod according to an embodiment of the present utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Inner mold; 2. Outer mold; 3. Screw; 4. Tie rod body; 5. Sealing mechanism; 51. Groove plate; 52. Elastic rubber strip; 53. Sealing ring; 6. Stop block; 7. Fixing nut; 8. Limiting mechanism; 81. Reinforcing rib plate; 82. Channel steel; 83. Limiting plate. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", 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. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0023] See Figures 1-3An embodiment of the present invention provides a grout-proof tie rod, comprising a screw 3 and a tie rod body 4 sleeved on the outside of the screw 3 and moving together with the screw 3, for connecting an inner mold 1 and an outer mold 2. The outer mold 2 has an installation hole, through which the tie rod body 4 passes. The inner mold 1 has a through hole, through which the end of the screw 3 passes. A fixing nut 7 is fixed inside the inner mold 1, and the screw 3 is threadedly connected to the fixing nut 7. A sealing mechanism 5 and a limiting mechanism 8 are provided on the outside of the tie rod body 4. The sealing mechanism 5 is used to seal the installation hole and the through hole, and the limiting mechanism 8 is used to limit the position of the outer mold 2.

[0024] In this embodiment, to address the problem of gaps between the traditional tie rod and the mold hole, which leads to grout leakage during concrete pouring and causes quality defects such as water loss, sanding, and depressions on the concrete forming surface around the hole, the tie rod body 4 and the screw rod 3 are inserted together through the mounting hole on the outer mold 2 during installation. Simultaneously, the end of the screw rod 3 is inserted through the through hole on the inner mold 1, and the screw rod 3 is rotated so that the end of the screw rod 3 is threaded into the fixing nut 7 inside the inner mold 1. As the screw rod 3 rotates and moves, the tie rod body 4 also moves accordingly. They move together until the end of the tie rod 4 near the inner mold 1 is in contact with the outer side of the inner mold 1. At this time, the limiting mechanism 8 on the outer side of the tie rod 4 also just restricts the outer mold 2 to a suitable position, ensuring that the distance between the inner mold 1 and the outer mold 2 maintains a fixed wall thickness. At the same time, the sealing mechanism 5 set on the outer side of the tie rod 4 can seal the installation hole of the outer mold 2 and the through hole of the inner mold 1, effectively preventing water loss, sanding and depressions and other quality defects in the concrete forming surface around these holes during concrete pouring, resulting in better performance.

[0025] The mounting hole has a diameter 0.3-0.5mm larger than the outer diameter of the corresponding tie rod 4, which facilitates the passage of the tie rod 4 and provides extrusion space for the sealing mechanism 5. The tie rod 4 passes through the mounting hole, and the through hole on the inner mold 1, which is adapted to the screw 3, has a diameter 0.2-0.3mm larger than the outer diameter of the screw 3, ensuring that the screw 3 passes through smoothly. The end of the screw 3 passes through the through hole, and the axis of the fixing nut 7, which is fixedly installed on the inner side of the inner mold 1, coincides with the axis of the through hole, with a coaxiality error of no more than 0.1mm. This ensures that the screw 3 can be accurately threaded into the fixing nut 7, avoiding installation jamming or uneven force due to eccentricity, and achieving reliable fixing of the screw 3 and the inner mold 1.

[0026] Optional, please refer to Figure 1 and Figure 3 A stop block 6 is fixedly installed at the end of the screw 3 away from the inner mold 1, and the outer diameter of the stop block 6 is larger than the inner diameter of the pull rod body 4.

[0027] In this embodiment, the outer diameter of the stop block 6 is 2-5mm larger than the inner diameter of the pull rod body 4. When the screw 3 rotates and moves toward the fixing nut 7, the stop block 6 can stably push the pull rod body 4 to move synchronously until the end of the pull rod body 4 near the inner mold 1 is in contact with the outer side of the inner mold 1, providing basic support for the compression sealing of the sealing mechanism 5.

[0028] Optional, please refer to Figure 1 , Figure 2 and Figure 3 The sealing mechanism 5 includes a grooved plate 51 fixedly installed on the outer wall of the pull rod body 4. An elastic rubber strip 52 is provided in the groove of the grooved plate 51. The thickness of the elastic rubber strip 52 is greater than the groove depth of the grooved plate 51. An annular groove is opened at one end of the pull rod body 4 near the inner mold 1. A sealing rubber ring 53 is provided in the annular groove. The thickness of the sealing rubber ring 53 is greater than the groove depth of the annular groove. When the pull rod is installed in place, the elastic rubber strip 52 is tightly fitted to the inner side of the outer mold 2, and the sealing rubber ring 53 is tightly fitted to the outer side of the inner mold 1. The elastic rubber strip 52 and the sealing rubber ring 53 are made of rubber, and the cross-section of the elastic rubber strip 52 and the sealing rubber ring 53 is rectangular or circular.

[0029] In this embodiment, a sealing mechanism 5 is provided on the outer side of the pull rod body 4 to seal the mounting hole of the outer mold 2 and the through hole of the inner mold 1, forming a double sealing structure. The sealing mechanism 5 includes a grooved plate 51 fixedly installed on the outer wall of the pull rod body 4. The grooved plate 51 is fixed to the pull rod body 4 by welding or integral molding to ensure structural stability. The groove width of the grooved plate 51 is 10-15mm and the groove depth is 3-5mm. An elastic rubber strip 52 is provided in the groove. The elastic rubber strip 52 is made of nitrile rubber or natural rubber. It has good elasticity and resistance to concrete erosion. Its thickness is 1-2mm greater than the groove depth of the groove plate 51. For example, when the groove depth is 4mm, the thickness of the rubber strip is set to 5-6mm to ensure that the rubber strip can be fully compressed and fill the gap after installation. At the same time, the width of the annular groove is 8-12mm and the groove depth is 2-4mm. A sealing rubber ring 53 is provided in the annular groove. The sealing rubber ring 53 is made of the same material as the elastic rubber strip 52, and its thickness is 1-1.5mm greater than the groove depth. For example, when the groove depth is 3mm, the thickness of the rubber ring is set to 4-4.5mm. When the tie rod is installed in place, the elastic rubber strip 52 is in contact with the inner side of the outer mold 2 and is subjected to 20%-30% compression. The sealing rubber ring 53 is in contact with the outer side of the inner mold 1 and is subjected to compression. Through elastic deformation, the compression completely fills the gap between the tie rod and the mold hole, preventing concrete slurry penetration and water loss.

[0030] Optional, please refer to Figure 1 and Figure 3The limiting mechanism 8 includes a limiting plate 83 fixedly installed on the outer wall of the tie rod body 4, a reinforcing rib plate 81 fixedly installed on the inner side of the outer mold 2, and a channel steel 82 fixedly installed on the outer side of the reinforcing rib plate 81. When the tie rod is installed in place, the limiting plate 83 and the channel steel 82 are in contact.

[0031] In this embodiment, a limiting mechanism 8 is also provided on the outside of the pull rod body 4 to limit the outer mold 2 to a fixed position, ensuring that the distance between the inner mold 1 and the outer mold 2 conforms to the designed wall thickness (such as 100mm, 150mm, 200mm). (For common wall thicknesses), the limiting mechanism 8 includes a limiting plate 83 fixedly installed on the outer wall of the tie rod body 4. The limiting plate 83 is made of Q235 steel plate with a thickness of 6-8mm (balancing strength and lightweight). It is welded and fixed perpendicularly to the tie rod body 4, with a verticality error of no more than 0.5°. A reinforcing rib plate 81 is fixedly installed on the inner side of the outer mold 2. The reinforcing rib plate 81 is made of Q235 steel plate with a thickness of 5mm. It is fixed to the outer mold 2 by full welding, with a weld height of not less than 4mm. It is used to enhance the structural strength of the outer mold 2 and avoid local deformation of the outer mold 2 due to pouring pressure. A channel steel 82 is fixedly installed on the outer side of the reinforcing rib plate 81. The channel steel 82 is connected to the reinforcing rib plate 81 by bolts or full welding to ensure a stable connection. When the tie rod is installed in place, the gap between the contact surfaces of the limiting plate 83 and the channel steel 82 does not exceed 0.2mm. The position of the outer mold 2 is precisely limited by mechanical limiting to avoid changes in the distance between the inner and outer molds 2 due to the side pressure of concrete during the pouring process, thus ensuring uniform wall thickness.

[0032] Optionally, the outer diameter of the portion of the pull rod 4 located between the inner mold 1 and the outer mold 2 gradually decreases from the outer mold 2 toward the inner mold 1.

[0033] In this embodiment, the outer diameter of the portion of the tie rod 4 located between the inner mold 1 and the outer mold 2 gradually decreases from the outer mold 2 toward the inner mold 1, forming a conical surface. This tapered design facilitates the tie rod 4's smooth passage through the mounting hole of the outer mold 2 during installation and plays a crucial role in the disassembly stage: when the concrete strength of the MIC wall reaches 70% of the design strength (usually 24-48 hours after pouring), the tie rod 4 can be rotated. Because the contact between the conical surface and the concrete is an inclined plane, a radial force is generated during rotation, causing the tie rod 4 to gradually separate from the concrete wall. After rotating 2-3 times, the tie rod 4 can be easily pulled out of the wall. The screw 3 can be removed from the fixing nut 7 by rotating in the opposite direction, achieving complete recycling of the tie rod. The reuse rate can reach over 80%, significantly reducing construction costs.

[0034] Optional, please refer to Figure 1 , Figure 2 and Figure 3The fixing nut 7 is fixed to the inner mold 1 by welding. The axis of the fixing nut 7 coincides with the axis of the through hole of the inner mold 1. The stop block 6 is integrally formed with the screw 3 or fixed by threaded connection. The cross-section of the stop block 6 is circular or regular hexagonal.

[0035] In this embodiment, the fixing nut 7 and the inner mold 1 are fixed by full welding, and the weld seam surrounds the outer circumference of the nut to ensure that the nut will not rotate due to the torque when the screw 3 is screwed in; if the stop block 6 and the screw 3 are integrally formed (such as hot forging), the overall structural strength can be improved, which is suitable for high-pressure casting scenarios; if a threaded connection is used, it is convenient to replace the stop block 6 separately after it is damaged, which is more flexible. If the cross-section of the stop block 6 is circular, the diameter is 3-4mm larger than the inner diameter of the pull rod body 4; if it is a regular hexagon, the distance between opposite sides is 2-3mm larger than the inner diameter of the pull rod body 4, which is convenient for wrench clamping operation and ensures that the force is even when pushing the pull rod body 4.

[0036] Although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A grout-proof tie rod, comprising a screw (3) and a tie rod body (4) sleeved on the outside of the screw (3) and moving together with the screw (3), for connecting an inner mold (1) and an outer mold (2), characterized in that, The outer mold (2) has an installation hole, the tie rod (4) passes through the installation hole, the inner mold (1) has a through hole, the end of the screw (3) passes through the through hole, a fixing nut (7) is fixed inside the inner mold (1), the screw (3) is threadedly connected to the fixing nut (7), a sealing mechanism (5) and a limiting mechanism (8) are provided on the outside of the tie rod (4), the sealing mechanism (5) is used to block the installation hole and the through hole, and the limiting mechanism (8) is used to limit the position of the outer mold (2).

2. The anti-leakage grout tie rod according to claim 1, characterized in that, A stop block (6) is fixedly installed at the end of the screw (3) away from the inner mold (1), and the outer diameter of the stop block (6) is larger than the inner diameter of the pull rod body (4).

3. The anti-leakage grout tie rod according to claim 1, characterized in that, The sealing mechanism (5) includes a grooved plate (51) fixedly installed on the outer wall of the pull rod body (4). An elastic rubber strip (52) is provided in the groove of the grooved plate (51). The thickness of the elastic rubber strip (52) is greater than the groove depth of the grooved plate (51).

4. A grout-proof tie rod according to claim 3, characterized in that, The pull rod body (4) has an annular groove at one end near the inner mold (1), and a sealing ring (53) is provided in the annular groove. The thickness of the sealing ring (53) is greater than the groove depth.

5. A grout-proof tie rod according to claim 4, characterized in that, When the pull rod is installed in place, the elastic rubber strip (52) is tightly fitted to the inner side of the outer mold (2), and the sealing rubber ring (53) is tightly fitted to the outer side of the inner mold (1).

6. A grout-proof tie rod according to claim 1, characterized in that, The limiting mechanism (8) includes a limiting plate (83) fixedly installed on the outer wall of the tie rod body (4), a reinforcing rib plate (81) fixedly installed on the inner side of the outer mold (2), and a channel steel (82) fixedly installed on the outer side of the reinforcing rib plate (81). When the tie rod is installed in place, the limiting plate (83) and the channel steel (82) are in contact.

7. A grout-proof tie rod according to claim 1, characterized in that, The outer diameter of the part of the tie rod (4) located between the inner mold (1) and the outer mold (2) gradually decreases from the outer mold (2) toward the inner mold (1).

8. A grout-proof tie rod according to claim 4, characterized in that, The elastic rubber strip (52) and the sealing ring (53) are made of rubber, and the cross-section of the elastic rubber strip (52) and the sealing ring (53) is rectangular or circular.

9. A grout-proof tie rod according to claim 1, characterized in that, The fixing nut (7) is fixed to the inner mold (1) by welding, and the axis of the fixing nut (7) coincides with the axis of the through hole of the inner mold (1).

10. A grout-proof tie rod according to claim 2, characterized in that, The stop block (6) is integrally formed with the screw (3) or fixed by a threaded connection, and the cross-section of the stop block (6) is circular or regular hexagonal.

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