Split bolt for accelerating initial setting of concrete and using method

Abstract

The invention provides a split bolt for accelerating initial setting of concrete and a using method. The split bolt comprises a middle connecting sleeve, and a connecting part is connected to the end of the middle connecting sleeve; a supporting clamping sleeve is installed on the middle connecting sleeve and located between the two connecting parts, a ring sleeve is coaxially installed in the middle connecting sleeve, and a supporting part is connected between the ring sleeve and the middle connecting sleeve; and a low-temperature molten material is filled between the inner wall of the middle connecting sleeve and the outer wall of the ring sleeve and in the ring sleeve. According to the split bolt, the space between the inner wall of the middle connecting sleeve and the outer wall of the ring sleeve and the interior of the ring sleeve are filled with the low-temperature molten materials, the middle connecting sleeve is fixed between the two oppositely-arranged formworks through the connecting part, and when heat energy is generated in the initial setting process of concrete, the heat energy can be absorbed through the solid low-temperature molten materials; the initial setting speed of the concrete is accelerated.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a tension bolt for accelerating the initial setting of concrete and a use method thereof. Background Art

[0002] In building construction, some building main bodies, beams, panels and other building units are all made of concrete, that is, the mold is formed by building a template, and in the process of building the mold, in order to ensure the stability of the connection between the two parallel templates, tension bolts are used between the two relative templates to fix them, that is, a connecting rod is inserted into the corresponding holes on the two relative templates, and the mountain-shaped components are used to fix the outside of the template to complete the fixation of the mold; then concrete is poured into the mold and left to solidify for a certain period of time to form building components. Since the setting speed of concrete has a key impact on the quality and progress of the project; especially in the high temperature environment in summer, during the concrete pouring process, the ambient temperature is too high. This leads to problems such as rapid evaporation of concrete water and abnormal hydration reaction, which prolongs the initial setting time of concrete and makes it prone to quality defects such as plastic shrinkage cracks. It also affects the continuity and overall efficiency of construction. Although there are some measures to regulate the temperature of concrete, such as using cooling water pipes to cool down, there are problems such as complex construction, high cost and difficulty in flexible adjustment. The tension bolts, as important components for fixing concrete formwork, only play the role of fixing the formwork and have a relatively single function. Therefore, it is necessary to develop a new type of tension bolt that can regulate the temperature of concrete while maintaining the stability and reusability of its own structure, thereby solving the problem of slow initial setting of concrete during construction and improving the quality and efficiency of building construction. Summary of the Invention

[0003] In order to solve the problem that the existing tension bolts can only fix the formwork and cannot accelerate the solidification of concrete, the present invention provides a tension bolt for accelerating the initial setting of concrete and a method for using the same.

[0004] To achieve the above object, the present invention provides the following technical solutions: The present invention provides a tension bolt for accelerating the initial setting of concrete, comprising a middle connecting sleeve, wherein the end of the middle connecting sleeve is connected to a connecting portion; A supporting sleeve is installed on the middle connecting sleeve between the two connecting parts, a ring sleeve is coaxially installed in the middle connecting sleeve, and a supporting part is connected between the ring sleeve and the middle connecting sleeve; The space between the inner wall of the middle connecting sleeve and the outer wall of the annular sleeve and the interior of the annular sleeve are filled with low-temperature molten material.

[0005] Preferably, the support portion includes a plurality of connecting ribs, which are arranged at equal intervals around the circumference of the ring sleeve, one end of the connecting rib is fixed to the outer wall of the ring sleeve, and the other end of the connecting rib is fixed to the inner wall of the middle connecting sleeve, and the connecting ribs are arranged along the length direction of the middle connecting sleeve, and a first through hole is provided on the connecting rib.

[0006] Preferably, a second through hole is provided on the ring sleeve, and the second through hole connects the interior of the ring sleeve with the interior of the middle connecting sleeve.

[0007] Preferably, an engaging platform is provided on the outer wall of the middle connecting sleeve along its length direction.

[0008] Preferably, a pressure relief groove is provided on the outer wall of the middle connecting sleeve, and a mounting column is provided in the pressure relief groove. A pressure relief flap and a torsion spring are rotatably connected to the mounting column, one side of the torsion spring is fixed on the inner wall of the pressure relief flap, and the other side of the torsion spring is fixed on the inner wall of the pressure relief groove.

[0009] Preferably, a waterproof cloth is provided on the outer wall of the supporting sleeve, and a heat conducting groove is provided on the inner wall of the supporting sleeve, and one end of the heat conducting groove passes through the outer wall of the supporting sleeve.

[0010] Preferably, a PVC layer is provided on the outer wall of the supporting sleeve, and a through groove with a width of 1 mm to 3 mm is provided on the PVC layer.

[0011] Preferably, the connecting portion comprises a threaded barrel, a limiting plate is provided on the inner side of the threaded barrel, the threaded barrel is mounted on the middle connecting sleeve, and one end surface of the limiting plate is in contact with the end surface of the middle connecting sleeve; The limiting plate is provided with an overflow hole, and the overflow hole connects the interior of the threaded cylinder with the interior of the annular sleeve.

[0012] Preferably, the connecting part includes a first connecting head and a second connecting head, the first connecting head is fixed to one end head of the middle connecting sleeve, and a first limiting ring is provided in the first connecting head at the position of the end head of the middle connecting sleeve, a mounting hole is provided on one end face of the second connecting head, the mounting hole is fixedly connected to the other end head of the middle connecting sleeve, a connecting column is provided on the other end face of the second connecting head, a conical sleeve is slidably connected to the connecting column, and the connecting column is used to connect a quick-release head.

[0013] The present invention provides a method for using a tension bolt for accelerating the initial setting of concrete. The method comprises the following steps: The middle connecting sleeve is inserted between two templates installed opposite to each other, with one end of the middle connecting sleeve located in a connecting hole opened on one of the templates, and the other end of the middle connecting sleeve located in a corresponding connecting hole opened on the other template; Install the connecting part at the end of the middle connecting sleeve, install the fixing parts on the outer wall of the template on the connecting part, and complete the installation of the tension bolts; When pouring concrete, the tension bolts are buried in the concrete. During the initial setting of the concrete, heat energy is generated by the cement hydration reaction, the transfer of ambient temperature, and the heat generated during the mixing process. The heat energy is transferred to the interior of the middle connecting sleeve through the supporting sleeve. The low-temperature molten material filled between the inner wall of the middle connecting sleeve and the outer wall of the annular sleeve and inside the annular sleeve absorbs the heat energy and melts, thereby accelerating the initial setting of the concrete. After the initial setting of the concrete is completed, first remove the fixings and the connection parts, then take out the end of the middle connecting sleeve exposed on the outside of the formwork, and fill the supporting sleeve with a filler with a thermal insulation effect.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention proposes a tension bolt for accelerating the initial setting of concrete. In this tension bolt, low-temperature molten material is filled between the inner wall of the middle connecting sleeve and the outer wall of the annular sleeve and inside the annular sleeve. The middle connecting sleeve is fixed between two relatively arranged templates through a connecting part. When the heat energy generated during the initial setting of the concrete is absorbed by the solid low-temperature molten material, the initial setting speed of the concrete is accelerated and converted into liquid low-temperature molten material. A part of the liquid low-temperature molten material flows out to between the outer wall of the middle connecting sleeve and the inner wall of the supporting sleeve, and plays a lubricating role between the outer wall of the middle connecting sleeve and the inner wall of the supporting sleeve, so that the middle connecting sleeve can be quickly separated from the supporting sleeve during the disassembly process, reducing the work intensity of the staff. A part of the liquid low-temperature molten material flows into the connecting part for collection for reuse.

[0015] Furthermore, the supporting part of the tension bolt is a plurality of connecting ribs, which divide the position between the outer wall of the ring sleeve and the inner wall of the middle connecting sleeve into a plurality of second chambers to ensure the strength between the middle connecting sleeve and the ring sleeve, thereby making the tension bolt have sufficiently large rigidity.

[0016] Furthermore, an engaging platform is provided on the outer wall of the middle connecting sleeve in the tension bolt, and the supporting sleeve can be quickly mounted on the middle connecting sleeve through the engaging section. At the same time, when the concrete has completed initial setting and the middle connecting sleeve is rotated in the supporting sleeve, the supporting sleeve is deformed on the oblique side of the engaging platform, which makes it easy to remove the middle connecting sleeve, thereby reducing the workload of the staff in disassembling the middle connecting sleeve.

[0017] Furthermore, a pressure relief groove is provided on the outer wall of the middle connecting sleeve in this tension bolt, and a pressure relief flap and a torsion spring are installed in the pressure relief groove. When the low-temperature molten material expands in volume during the liquefaction process, the partially liquefied low-temperature molten material pushes the pressure relief flap and the pressure relief groove, so that part of the liquid low-temperature molten material is filled between the support sleeve and the outer wall of the middle connecting sleeve, causing the support sleeve to expand slightly outward to reduce the friction between the support sleeve and the middle connecting sleeve, thereby facilitating the separation of the middle connecting sleeve and the support sleeve, so that the middle connecting sleeve can be quickly removed from the concrete.

[0018] Furthermore, in this tension bolt, a waterproof cloth is provided on the outer wall of the supporting sleeve. The waterproof cloth ensures that the position of the supporting sleeve in the concrete remains unchanged during the removal of the middle connecting sleeve, thereby increasing the stability of the connection between the supporting sleeve and the concrete.

[0019] Furthermore, in this tension bolt, a third chamber is separated by a limit plate in the threaded barrel to collect the liquid low-temperature molten material. At the same time, it effectively releases the pressure generated by the low-temperature molten material during the liquefaction process, saves low-temperature molten material resources, and reduces the manufacturing cost of the tension bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 2 A schematic structural diagram of the upper middle connecting section of a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 3 A schematic front view of the upper middle connecting section of a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 4 A schematic front cross-sectional view of the connection between the upper middle connecting section and the connecting portion of a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 5 A schematic side view of the upper middle connecting section of a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 6 A schematic diagram of a partial cross-section of the upper middle connecting section of a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 7 A schematic cross-sectional view of a tension bolt for accelerating the initial setting of concrete provided by the present invention when in use; Figure 8 A schematic diagram of the connection between the pressure relief flap and the middle connecting section of a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 9 This is a schematic diagram of one embodiment of a supporting sleeve in a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 10 This is a second schematic diagram of an embodiment of a supporting sleeve in a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 11 This is a schematic diagram of another embodiment of a supporting sleeve in a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 12 This is a second schematic diagram of another embodiment of a supporting sleeve in a tension bolt for accelerating the initial setting of concrete provided by the present invention; Figure 13 A schematic diagram of a three-dimensional structure of a connection between a tension bolt and a connecting portion for accelerating the initial setting of concrete provided by the present invention; Figure 14 A schematic front cross-sectional view of a connection between a tension bolt and a connecting portion for accelerating the initial setting of concrete provided by the present invention; Figure 15 A schematic diagram of conventional installation of a tension bolt for accelerating initial setting of concrete provided by the present invention; In the accompanying drawings: 1. Support sleeve; 2. Fitting platform; 3. Connecting cylinder; 4. Pressure relief flap; 5. Pressure relief groove; 6. Ring sleeve; 7. Connecting rib; 8. Middle connecting sleeve; 9. First through hole; 10. Second through hole; 11. Third cavity; 12. Limiting plate; 13. Overflow hole; 14. First cavity; 15. Second cavity; 16. Waterproof cloth; 17. Organic glue; 18. Torsion spring; 19. First connector; 20. Second connector; 21. Heat conduction groove. DETAILED DESCRIPTION

[0021] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0024] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] The present invention proposes a tension bolt for accelerating the initial setting of concrete, such as Figures 1 to 12As shown, it includes a middle connecting sleeve 8, and the ends of the left and right ends of the middle connecting sleeve 8 are connected with connecting parts. The connecting parts are coaxially arranged with the middle connecting sleeve 8, and the connecting parts are used to connect the templates. The middle connecting sleeve 8 is fixed between the two opposite templates to achieve the connection of the templates; a supporting sleeve 1 is installed between the two connecting parts on the middle connecting sleeve 8. The cross-section of the supporting sleeve 1 perpendicular to its axial direction is arc-shaped, and it has a certain elasticity. A ring sleeve 6 is coaxially installed in the middle connecting sleeve 8. The middle connecting sleeve The end of 8 is flush with the end of the ring sleeve 6, and a support portion is connected between the ring sleeve 6 and the middle connecting sleeve 8, and the space between the inner wall of the middle connecting sleeve 8 and the outer wall of the ring sleeve 6 is divided into multiple second cavities 15 by the support portion, and the internal space of the ring sleeve 6 is defined as the first cavity 14, and the space between the inner wall of the middle connecting sleeve 8 and the outer wall of the ring sleeve 6 and the interior of the ring sleeve 6 are filled with low-temperature melting material, that is, the first cavity 14 and the second cavity 15 are filled with low-temperature melting material, and are in solid state. When the tension bolts are installed between two relatively set formworks and concrete is poured between the formworks, the concrete buries the support sleeve 1. During the initial setting of the concrete, heat energy composed of cement hydration reaction, ambient temperature transfer and heat generated during the stirring process will be generated. The heat energy is transferred to the inside of the middle connecting sleeve 8, and the low-temperature melting material liquefies after absorbing the heat energy, thereby promoting the solidification of the concrete and accelerating the initial setting speed of the concrete; in this embodiment, the low-temperature melting material is low-melting point paraffin; in this embodiment, the low-melting point paraffin is filled in the middle connecting sleeve 8. The filling method is as follows: the middle connecting sleeve 8 is placed upright, one end of the middle connecting sleeve 8 is placed against the ground or work surface, and liquid low-melting-point paraffin is poured into the first cavity 14 and the second cavity 15 at the top. The middle connecting sleeve 8 is then moved to a temperature-controlled environment and the temperature is lowered to allow the low-melting-point paraffin to solidify and shrink in volume. During the solidification process of the low-melting-point paraffin, liquid low-melting-point paraffin is poured in at an appropriate time. When the low-melting-point paraffin becomes solid and is directly flush with the top surface of the middle connecting sleeve 8, the low-melting-point paraffin filling is completed. After the middle connecting sleeve 8 is filled with low-melting-point paraffin, it should be completely removed and stored in a low-temperature storage box.

[0028] like Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, the support portion includes a plurality of connecting ribs 7, which are arranged at equal intervals around the circumference of the ring sleeve 6, dividing the space between the inner wall of the middle connecting sleeve 8 and the outer wall of the ring sleeve 6 into a plurality of second cavities 15. In this embodiment, four connecting ribs 7 are provided, one end of the connecting rib 7 is fixed on the outer wall of the ring sleeve 6, and the other end of the connecting rib 7 is fixed on the inner wall of the middle connecting sleeve 8, and the connecting ribs 7 are arranged along the length direction of the middle connecting sleeve 8. The length of the connecting rib 7 is the same as the length of the middle connecting sleeve 8, and a plurality of first through holes 9 are provided on the outer wall of each connecting rib 7. The plurality of first through holes 9 are arranged in a row at equal intervals along the length direction of the connecting rib 7. The two second cavities 15 on both sides of the same connecting rib 7 are connected through the first through holes 9, so as to facilitate the filling of the second cavity 15 with low-temperature molten material, reduce the manufacturing difficulty and manufacturing cost of the tension bolt, and at the same time, facilitate the flow of liquefied low-temperature molten material, and then discharge the liquefied low-temperature molten material.

[0029] like Figure 3 、 Figure 4 and Figure 6 As shown, a plurality of second through holes 10 are provided on the outer wall of the ring sleeve 6. The plurality of second through holes 10 are evenly arranged on the ring sleeve 6 between the two connecting ribs 7, connecting the interior of the ring sleeve 6 with the interior of the middle connecting sleeve 8, so that the liquefied low-temperature molten material enters the ring sleeve 6 through the second through holes 10 and flows out of the ring sleeve 6.

[0030] like Figures 1 to 6 As shown, a fitting platform 2 is provided on the outer wall of the middle connecting sleeve 8 along its length direction. The length of the fitting platform 2 is the same as that of the supporting sleeve 1. The supporting sleeve 1 can be quickly clamped on the outer side of the middle connecting sleeve 8 through the fitting platform 2. When the tension bolt is used, the fitting platform 2 is located at the bottom, so that after the middle connecting sleeve 8 is removed from the concrete, the supporting sleeve 1 can also support the concrete to prevent local collapse or settlement in the concrete; the cross-sectional shape of the fitting platform 2 is trapezoidal, that is, the upper edge size is larger than the lower edge size, and the transition area where the fitting platform 2 and the supporting sleeve 1 are clamped is filled with organic glue 17. The organic glue 17 adopts silicone sealant or glutinous rice glue. The organic glue 17 plays a lubricating role in the initial rotation of the fitting platform 2, and the organic glue 17 can also prevent concrete slurry from entering the gap between the fitting platform 2 and the supporting sleeve 1, avoiding the middle connecting sleeve 8 from being difficult to rotate and increasing the difficulty of removing the middle connecting sleeve 8 from the concrete.

[0031] like Figure 2 、 Figure 3 、 Figure 6 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 and Figure 12As shown, a plurality of pressure relief grooves 5 are provided on the inner wall of the middle connecting sleeve 8, and the plurality of pressure relief grooves 5 are located between the two connecting ribs 7 connected on the inner wall of the middle connecting sleeve 8, and the plurality of pressure relief grooves 5 are arranged at equal intervals between the two connecting ribs 7, and one end of the plurality of pressure relief grooves 5 passes through the outer wall of the middle connecting sleeve 8, and a mounting column is provided between the two opposite side walls in each pressure relief groove 5 at a position close to the end face of one side thereof, and a pressure relief flap 4 is rotatably connected to the mounting column, and a torsion spring 18 is also installed on the mounting column, and one side of the torsion spring 18 is fixed to the inner wall of the pressure relief flap 4, and the other side of the torsion spring 18 is fixed to the inner wall of the pressure relief groove 5, so that the pressure relief flap 4 is not When subjected to external force, it remains stable and seals the pressure relief groove 5. When the low-temperature molten material filled in the middle connecting sleeve 8 is liquefied, the volume of the low-temperature molten material expands, and the partially liquefied low-temperature molten material pushes the pressure relief flap 4 to rotate on the mounting column, so that the torsion spring 18 twists and opens the pressure relief groove 5. A portion of the low-temperature molten material (low-melting-point paraffin) overflows from the pressure relief groove 5 and fills between the outer wall of the supporting sleeve 1 and the middle connecting sleeve 8, causing the supporting sleeve 1 to expand slightly outward and reduce the friction between the supporting sleeve 1 and the middle connecting sleeve 8, thereby facilitating the separation of the middle connecting sleeve 8 from the supporting sleeve 1, so that the middle connecting sleeve 8 can be quickly removed from the concrete.

[0032] like Figure 9 and Figure 10 As shown, it is an embodiment of the support sleeve 1. A waterproof cloth 16 is provided on the outer wall of the support sleeve 1. The waterproof cloth 16 is bonded to the outer wall of the support sleeve 1 by glue. A heat conducting groove 21 is provided on the inner wall of the support sleeve 1. One end of the heat conducting groove 21 passes through the outer wall of the support sleeve 1. The heat conducting groove 21 can better transfer the heat energy generated by the initial setting of the concrete to the low-temperature molten material filled in the middle connecting sleeve 8. When the initial setting of the concrete is completed, the waterproof cloth 16 is also firmly bonded to the concrete slurry. When the middle connecting sleeve 8 is taken out, the support sleeve 1 is still fixed in the concrete through the bonding of the waterproof cloth 16 with the concrete.

[0033] like Figure 11 and Figure 12 As shown, another embodiment of the support sleeve 1 is provided. The support sleeve 1 is made of PVC material. A PVC layer is provided on the outer wall of the support sleeve 1. A through groove with a width of 1 mm to 3 mm is provided on the outer wall of the PVC layer. The through groove allows part of the concrete slurry to enter the PVC layer, thereby strengthening the bonding force between the support sleeve 1 and the concrete and ensuring the stability of the support sleeve 1 fixed in the concrete during the removal of the middle connecting sleeve 8.

[0034] like Figure 1 、 Figure 4 and Figure 15As shown, the connection portion includes a connecting tube 3, the inner wall and the outer wall of the connecting tube 3 are provided with threads, and a limiting plate 12 is provided on the inner side of the connecting tube 3. The limiting plate 12 is installed along the radial direction of the connecting tube 3, and the interior of the connecting tube 3 is divided into a mounting cavity and a third cavity 11 by the limiting plate 12. The position of the connecting tube 3 in the mounting cavity is installed on the end head of the middle connecting sleeve 8 through a thread. After the middle connecting sleeve 8 is installed between the two relatively set templates, a mountain-shaped piece is installed on the outer wall of the connecting tube 3 that fits the template, and a mountain-shaped nut is installed on the outer end head of the connecting tube 3; the limiting plate One side end face of 12 fits with the end face of the middle connecting sleeve 8; an overflow hole 13 is provided at the center position of the limiting plate 12 along the axial direction of the connecting cylinder 3, and the diameter of the first cavity 14 in the annulus 6 is not larger than the diameter of the overflow hole 13. The two end ports of the overflow hole 13 respectively pass through the end faces of both sides of the limiting plate 12. The overflow hole 13 connects the interior of the connecting cylinder 3 with the interior of the annulus 6, so that the liquefied low-temperature molten material in the annulus 6 is gathered into the third cavity 11 through the overflow hole 13, so as to facilitate reuse and release the pressure when the low-temperature molten material inside the middle connecting sleeve 8 melts.

[0035] Preferably, in order to make the tension bolt suitable for firing the gun, the connecting portion can be Figure 13 and Figure 14 In the structure shown, the connecting part includes a first connecting head 19 and a second connecting head 20. The first connecting head 19 is fixed to the left end head of the middle connecting sleeve 8, and a first limiting ring is provided in the first connecting head 19 at the position of the end head of the middle connecting sleeve 8. The outer end face of the first limiting ring is in contact with the end face of the middle connecting sleeve 8. A mounting hole is provided on the left end face of the second connecting head 20 along its axial direction. The right end head of the middle connecting sleeve 8 is fixedly connected in the mounting hole. A connecting column is provided on the other side end face of the second connecting head 20. A conical sleeve is slidably connected to the connecting column. The connecting column is used to connect a quick-release head. The quick-release head is an existing specific structure and will not be described here. The specific structure can refer to the fixing part proposed in a template quick connector.

[0036] The present invention provides a method for using a tension bolt for accelerating the initial setting of concrete. The method comprises the following steps: The components of the tension bolts are prefabricated in the factory and assembled into tension bolts; The middle connecting sleeve 8 is inserted between two relatively installed templates, with one end of the middle connecting sleeve 8 located in the connecting hole opened on one of the templates, and the other end of the middle connecting sleeve 8 located in the corresponding connecting hole opened on the other template; Install the connecting part on the end of the middle connecting sleeve 8, and install the fixing piece on the connecting part that fits on the outer wall of the template to complete the installation of the tension bolt; that is, install the connecting tube 3 on the two end heads of the middle connecting sleeve 8 through threads, install the mountain-shaped piece and the mountain-shaped nut at the position of the connecting tube 3 that fits on the outer end face of the template, and fix the tension bolt between the two oppositely arranged templates, or install the first connecting head 19 on one end head of the middle connecting sleeve 8, install the second connecting head 20 on the other end head of the middle connecting sleeve 8, install the quick-release head on the second connecting head 20 at the position that fits on the outer end face of the template, and install the nut on the first connecting head 19 at the position that fits on the outer end face of the template to complete the installation of the tension bolt; When pouring concrete, the tension bolts are buried in the concrete, that is, the concrete buries the support sleeve 1. During the initial setting of the concrete, heat energy composed of cement hydration reaction, ambient temperature transfer and heat generated during the mixing process is generated. The heat energy is transferred to the interior of the middle connecting sleeve 8 through the support sleeve 1 and the fitting platform 2. The low-temperature molten material filled between the inner wall of the middle connecting sleeve 8 and the outer wall of the annular sleeve 6 and inside the annular sleeve 6 absorbs the heat energy and melts. The initial setting of the concrete is accelerated by lowering the temperature of the concrete near the tension bolts. The liquid material formed by the low-temperature molten material flows into the third cavity 11 through the overflow hole 13, and the low-temperature molten material in the second cavity 15 absorbs the heat energy and melts. A part of it enters the interior of the annular sleeve 6 through the second through hole 10, and a part of it pushes the pressure relief flap 4 in the pressure relief groove 5 and enters between the inner wall of the support sleeve 1 and the outer wall of the middle connecting sleeve 8. After the initial setting of the concrete is completed, first remove the fixing parts and the connection parts, that is, remove the mountain-shaped parts, the mountain-shaped mother and the connecting tube 3, or remove the first connecting head 19, and then remove the middle connecting sleeve 8 from the concrete by clamping the exposed end of the middle connecting sleeve 8 outside the template, and fill the supporting sleeve 1 with a filler with a thermal insulation effect, such as asbestos.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0038] In addition, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for the purpose of illustrating the technical concept of the present invention and cannot be used to limit the scope of protection of the present invention. Any changes made based on the technical solution in accordance with the technical concept proposed by the present invention fall within the scope of protection of the claims of the present invention.

Claims

1. A tension bolt for accelerating the initial setting of concrete, characterized in that: It comprises a middle connecting sleeve (8), wherein the end of the middle connecting sleeve (8) is connected to a connecting portion; A supporting sleeve (1) is installed on the middle connecting sleeve (8) between the two connecting parts, a ring sleeve (6) is coaxially installed in the middle connecting sleeve (8), and a supporting part is connected between the ring sleeve (6) and the middle connecting sleeve (8); Low-temperature molten material is filled between the inner wall of the middle connecting sleeve (8) and the outer wall of the annular sleeve (6), and inside the annular sleeve (6).

2. A tension bolt for accelerating the initial setting of concrete according to claim 1, characterized in that: The support portion comprises a plurality of connecting ribs (7), the plurality of connecting ribs (7) being arranged at equal intervals around the circumference of the ring sleeve (6), one end of the connecting rib (7) being fixed to the outer wall of the ring sleeve (6), the other end of the connecting rib (7) being fixed to the inner wall of the middle connecting sleeve (8), and the connecting ribs (7) being arranged along the length direction of the middle connecting sleeve (8), and a first through hole (9) being provided on the connecting rib (7).

3. The tension bolt for accelerating the initial setting of concrete according to claim 2, characterized in that: The ring sleeve (6) is provided with a second through hole (10), and the second through hole (10) connects the interior of the ring sleeve (6) with the interior of the middle connecting sleeve (8).

4. The tension bolt for accelerating the initial setting of concrete according to claim 1, characterized in that: An engaging platform (2) is provided on the outer wall of the middle connecting sleeve (8) along its length direction.

5. The tension bolt for accelerating the initial setting of concrete according to claim 4, characterized in that: A pressure relief groove (5) is provided on the inner wall of the middle connecting sleeve (8), a mounting column is provided in the pressure relief groove (5), a pressure relief flap (4) is rotatably connected to the mounting column, and a torsion spring (18) is also installed on the mounting column, one side of the torsion spring (18) is fixed to the inner wall of the pressure relief flap (4), and the other side of the torsion spring (18) is fixed to the inner wall of the pressure relief groove (5).

6. The tension bolt for accelerating the initial setting of concrete according to claim 5, characterized in that: A waterproof cloth (16) is provided on the outer wall of the support sleeve (1), and a heat conduction groove (21) is provided on the inner wall of the support sleeve (1), with one end of the heat conduction groove (21) passing through the outer wall of the support sleeve (1).

7. The tension bolt for accelerating the initial setting of concrete according to claim 5, characterized in that: A PVC layer is provided on the outer wall of the supporting sleeve (1), and a through groove with a width of 1 mm to 3 mm is provided on the PVC layer.

8. The tension bolt for accelerating the initial setting of concrete according to claim 2, characterized in that: The connecting portion comprises a threaded barrel (3), a limiting plate (12) is provided on the inner side of the threaded barrel (3), the threaded barrel (3) is mounted on the middle connecting sleeve (8), and one end surface of the limiting plate (12) is in contact with the end surface of the middle connecting sleeve (8); An overflow hole (13) is provided on the limiting plate (12), and the overflow hole (13) connects the interior of the threaded barrel (3) with the interior of the annular sleeve (6).

9. The tension bolt for accelerating the initial setting of concrete according to claim 1, characterized in that: The connecting portion includes a first connecting head (19) and a second connecting head (20), wherein the first connecting head (19) is fixed to one end of the middle connecting sleeve (8), and a first limiting ring is provided in the first connecting head (19) at a position of the end of the middle connecting sleeve (8), a mounting hole is provided on one end face of the second connecting head (20), and the mounting hole is fixedly connected to the other end of the middle connecting sleeve (8), and a connecting column is provided on the other end face of the second connecting head (20), a conical sleeve is slidably connected to the connecting column, and the connecting column is used to connect the quick-release head.

10. A method for using a tension bolt for accelerating the initial setting of concrete, using the tension bolt for accelerating the initial setting of concrete according to any one of claims 1 to 9, characterized in that: The following steps are involved: The middle connecting sleeve (8) is inserted between two templates installed opposite to each other, and one end of the middle connecting sleeve (8) is located in a connecting hole opened on one of the templates, and the other end of the middle connecting sleeve (8) is located in a corresponding connecting hole opened on the other template; Install the connecting portion at the end of the middle connecting sleeve (8), and install the fixing piece on the outer wall of the template on the connecting portion to complete the installation of the tension bolts; Concrete is poured, and the tension bolts are buried in the concrete. During the initial setting of the concrete, heat energy is generated by the cement hydration reaction, the transfer of ambient temperature, and the heat generated during the mixing process. The heat energy is transferred to the interior of the middle connecting sleeve (8) through the supporting sleeve (1). The low-temperature molten material filled between the inner wall of the middle connecting sleeve (8) and the outer wall of the ring sleeve (6) and the interior of the ring sleeve (6) absorbs the heat energy and melts, thereby accelerating the initial setting of the concrete; After the initial setting of the concrete is completed, the fixing parts and the connection parts are first disassembled, and then the end of the middle connecting sleeve (8) exposed outside the template is taken out, and the supporting sleeve (1) is filled with a filler with a heat-insulating effect.

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