A piston-type grouting sleeve suitable for prefabricated concrete components and its use method

Abstract

The present invention relates to the field of prefabricated buildings and is a piston-type grouting sleeve suitable for concrete precast components and a method of use. The piston-type grouting sleeve is arranged at the connecting end of the concrete precast component. The piston-type grouting sleeve includes a sleeve placed in the concrete precast component, a first plug is connected to the first end of the sleeve, a second plug is connected to the second end of the sleeve, and a grouting hole and a slurry outlet hole are provided on the sleeve between the first plug and the second plug; the piston is installed in the sleeve, the piston is located between the grouting hole and the slurry outlet on the side close to the grouting hole, and the grouting hole is located between the piston and the first plug; the first end of the connecting steel bar is connected to the piston, a through hole is provided in the middle of the second plug, and the second end of the connecting steel bar is inserted into the through hole of the second plug; the first plug is connected to the force-bearing connecting steel bar in the concrete precast component. It solves a series of problems caused by reserved exposed steel bars during production, transportation, and hoisting, and avoids on-site wet operations.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated buildings, and in particular to a piston-type grouting sleeve suitable for prefabricated concrete components and a method of use. Background Art

[0002] Prefabricated concrete structures account for the majority of prefabricated buildings, and precast concrete components are an important component of prefabricated concrete structures. Currently, there are two types of connection methods between precast concrete components: dry connection and wet connection. The wet connection method requires pouring concrete to connect the precast concrete components into a whole during construction. This involves a lot of wet work on the construction site, which not only reduces construction efficiency and poor site environmental quality, but also increases carbon emissions on the construction site, which does not meet energy-saving and environmental protection requirements. Therefore, the wet connection method cannot fully leverage the advantages of prefabricated buildings. The dry connection method requires rebar to be reserved at the edges of the precast concrete components during factory prefabrication. During construction, the precast concrete components are connected into a whole using conventional grouting sleeves. However, because these reserved rebars are exposed outside the precast concrete components, they are often bent, deformed, and rusted due to poor protection during production, transportation, stacking, and hoisting. This can lead to problems such as misalignment between the reserved rebar and the conventional grouting sleeves during installation of the precast concrete components, seriously affecting assembly construction efficiency.

[0003] Therefore, it is crucial to solve the technical problems of high mold costs and low production efficiency caused by reserved exposed steel bars, and the inaccurate insertion of reserved steel bars into conventional grouting sleeves after bending, deformation, and rust during lifting and installation, which makes it difficult to install concrete prefabricated components smoothly and has low assembly construction efficiency. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned problems, and thus provides a piston-type grouting sleeve suitable for concrete precast components and a method of use. The piston-type grouting sleeve replaces the exposed reserved steel bars of the concrete precast components, so that there are no exposed reserved steel bars on each surface, thereby solving a series of problems caused by the exposed reserved steel bars of the concrete precast components, such as high mold cost, low production efficiency, and unchanged lifting. It also solves the problem that the reserved steel bars cannot be accurately inserted into the conventional grouting sleeve after bending, deformation, and rusting, thereby ensuring the smooth installation of the concrete precast components and improving the assembly construction efficiency.

[0005] The present invention solves the above problems by adopting the following technical solutions:

[0006] A piston grouting sleeve suitable for concrete precast components, the piston grouting sleeve is arranged at the connection end of the concrete precast component, the piston grouting sleeve comprises a sleeve, a piston and a connecting steel bar, the sleeve is placed in the concrete precast component, the outer side of the second end of the sleeve is flush with the end surface of the connection end of the concrete precast component, the sleeve is a cylindrical structure, a first plug is connected to the first end of the sleeve, and a second plug is connected to the second end of the sleeve, a grouting hole and a grouting hole are provided on the sleeve between the first plug and the second plug, the grouting hole is close to the first plug, and the grouting hole is close to the second plug. The grouting hole and the slurry outlet hole both extend outward from the concrete precast component; the piston is slidably installed in the sleeve, and the piston is located between the grouting hole and the slurry outlet hole on the side close to the grouting hole, and the grouting hole is located between the piston and the first plug; the connecting steel bar is placed inside the sleeve, and the first end of the connecting steel bar is connected to the piston, and a through hole is provided in the middle of the second plug, and the second end of the connecting steel bar is inserted into the through hole of the second plug; the first plug is connected to the stress-bearing steel bar in the concrete precast component; when grouting material is poured into the sleeve, the grouting material will push the piston to move toward the second end of the sleeve, thereby causing the connecting steel bar to extend out of the sleeve.

[0007] Furthermore, a limiting steel bar is provided between the piston and the first plug, one end of the limiting steel bar is connected to the first end of the connecting steel bar, and the other end of the limiting steel bar abuts against the inner side surface of the first plug.

[0008] Furthermore, rubber plugs are provided on the grouting holes and the slurry outlet holes to seal the grouting holes and the slurry outlet holes.

[0009] Furthermore, a plastic film is provided on the outer side of the second plug to seal the through hole on the second plug.

[0010] Furthermore, the slurry outlet hole and the inner side of the second plug are arranged at a distance, and the distance between the slurry outlet hole and the second plug is consistent with the thickness of the piston.

[0011] Furthermore, a groove is provided on the outer surface of the sleeve which is symmetrical with respect to the axis of the sleeve.

[0012] Furthermore, internal threads are provided in the first and second ends of the sleeve, external threads are provided on the outer surfaces of the first plug and the second plug, and the first plug and the second plug are installed in the first and second ends of the sleeve through a threaded structure; an internal thread is provided in the middle of the first plug, and the internal thread is threadedly connected to the end of the stressed steel bar.

[0013] Furthermore, the diameter of the piston is adapted to the inner diameter of the sleeve, and a threaded hole is provided in the middle of the piston for threaded connection with the connecting steel bar.

[0014] Furthermore, a circular hole is provided in the middle of the second plug, the diameter of which is 1-2 mm larger than the diameter of the connecting steel bar.

[0015] A method for using a piston-type grouting sleeve suitable for a precast concrete component comprises the following steps:

[0016] S1. Produce precast concrete components with piston-type grouting sleeves in the factory and transport them to the construction site;

[0017] S2. Hoist the precast concrete component into place, align the piston-type grouting sleeve on the precast concrete component with the conventional grouting sleeve on the first component, and lay a sealing rubber pad between the precast concrete component and the first component;

[0018] S3, inject grouting material into the conventional grouting sleeve until the grouting material in the conventional grouting sleeve overflows from the grouting hole;

[0019] S4. Inject grouting material into the piston-type grouting sleeve on the precast concrete component. Pushed by the grouting material, the piston moves outward, thereby causing the connecting steel bar to extend out of the precast concrete component and enter the conventional grouting sleeve.

[0020] S5. When the piston moves to the second plug, the grouting material overflows from the slurry outlet of the piston grouting sleeve, and the grouting is completed. At the same time, the piston moves to the second end of the piston grouting sleeve, and the connecting steel bar can be completely inserted into the conventional grouting sleeve to realize the connection between the precast concrete component and the first component.

[0021] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features:

[0022] 1. The present invention uses a piston-type grouting sleeve as an intermediate connecting component between the stressed steel bars in the precast concrete component and the conventional grouting sleeves in other precast concrete components, thereby replacing the exposed reserved steel bars of the precast concrete component. In addition, the precast concrete component with the piston-type grouting sleeve has no exposed reserved steel bars on all sides, thereby solving a series of problems caused by the exposed reserved steel bars of the precast concrete component, such as high mold cost, low production efficiency, and unchanged lifting, and can effectively improve the production efficiency and shipping efficiency of the precast concrete components; solves the problem of misalignment between the reserved steel bars and the conventional grouting sleeves due to bending, deformation, and rust, ensures the smooth installation of the precast concrete components, improves the assembly construction efficiency, and effectively improves the work efficiency throughout the entire cycle of the prefabricated concrete building structure, with significant economic benefits.

[0023] 2. The present invention can achieve seamless installation between precast concrete components during assembly. The construction site only needs to grout the sleeves inside the precast concrete components, and there is no need to reserve space for pouring concrete on site, thereby realizing "dry connection" of precast concrete components, greatly reducing wet pouring operations, achieving "four savings and one environmental protection", improving the environmental quality of the construction site, reducing carbon emissions at the construction site, and having significant environmental and social benefits.

[0024] 3. The present invention has a wide range of applications and can realize "dry connection" in various prefabricated reinforced concrete structural systems such as prefabricated reinforced concrete shear wall structures and prefabricated reinforced concrete frame structures. In addition, the force transmission path is simple, the force mechanism is simple, and the force transmission is reliable.

[0025] 4. It solves the problems of high mold production cost, low component production efficiency, inconvenient transportation and hoisting caused by the exposed reserved steel bars of traditional precast concrete components. It can also avoid on-site pouring of connection nodes, reduce on-site pouring wet operations, reduce formwork projects, and improve the construction site environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a prefabricated concrete component with a piston-type grouting sleeve according to the present invention;

[0027] Figure 2 It is a structural schematic diagram of the piston-type grouting sleeve of the present invention;

[0028] Figure 3 This is a schematic diagram of the concrete prefabricated component installation structure with a piston-type grouting sleeve of the present invention. Figure 1 ;

[0029] Figure 4 yes Figure 3 Schematic diagram of the DD surface structure;

[0030] Figure 5 This is a schematic diagram of the concrete prefabricated component installation structure with a piston-type grouting sleeve of the present invention. Figure 2 ;

[0031] In the figure: 1. Sleeve; 2. Piston; 3. Connecting steel bar; 4. Precast concrete component; 5. First plug; 6. Second plug; 7. Grouting hole; 8. Grouting hole; 9. Stretching steel bar; 10. Limiting steel bar; 11. Plastic film; 12. Notch; 15. Conventional grouting sleeve; 16. Sealing pad. DETAILED DESCRIPTION

[0032] The following description of the embodiments will help the public better understand the present invention, but the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solutions of the present invention. Any changes to the definitions of components or technical features and / or formal rather than substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solutions of the present invention.

[0033] See also Figures 1 to 5 As shown, the technical solution of the present invention is as follows:

[0034] A piston grouting sleeve suitable for concrete precast components, the piston grouting sleeve is arranged at the connecting end of the concrete precast component 4, the piston grouting sleeve includes a sleeve 1, a piston 2 and a connecting steel bar 3, the sleeve 1 is made of seamless steel pipe, the inner wall of the sleeve 1 is smooth, the piston 2 is made of round steel, the connecting steel bar 3 should meet the anchoring length and meet the relevant requirements of "Grouting Sleeve for Steel Bar Connection" JG / T 398, the diameter of the connecting steel bar 3 is one level larger than the stressed steel bar 9, the difference between the inner diameter of the sleeve 1 and the nominal diameter of the connecting steel bar 3 is not less than 15mm, the length of the sleeve 1 is greater than the length of the connecting steel bar 3, the sleeve 1 is placed in the concrete precast component 4, the outer side of the second end of the sleeve 1 is flush with the end face of the connecting end of the concrete precast component 4, the sleeve 1 is a cylindrical structure, a first plug 5 is connected to the first end of the sleeve 1, and a second plug 6 is connected to the second end of the sleeve 1, and the first plug 5 and the second plug 6 are both made of round steel. A grouting hole 7 and a slurry outlet hole 8 are provided on the sleeve 1 between the first plug 5 and the second plug 6. The grouting hole 7 is close to the first plug 5, and the edge of the grouting hole 7 is close to the first plug 5. The diameter of the grouting hole 7 is not greater than 8 mm. The slurry outlet hole 8 is close to the second plug 6. The diameter of the slurry outlet hole 8 is not greater than 5 mm. The grouting hole 7 and the slurry outlet hole 8 both extend outward from the precast concrete component 4; the piston 2 is slidably installed in the sleeve 1, and the piston 2 is located between the grouting hole 7 and the slurry outlet hole 8 on one side close to the grouting hole 7. 7 is located between the piston 2 and the first plug 5; the connecting steel bar 3 is placed inside the sleeve 1, the first end of the connecting steel bar 3 is connected to the piston 2, and a through hole is provided in the middle of the second plug 6. The inner diameter of the through hole is 1mm-2mm larger than the diameter of the connecting steel bar 3, which is conducive to the smooth extension of the connecting steel bar 3 from the through hole. The second end of the connecting steel bar 3 is inserted into the through hole of the second plug 6; the first plug 5 is connected to the stress-bearing steel bar 9 in the concrete prefabricated component 4; when the grouting material is poured into the sleeve 1, the grouting material will push the piston 2 toward the sleeve 1. The second end moves, thereby making the connecting steel bar 3 extend out of the sleeve 1, and the connecting steel bar 3 transmits internal force through the second plug 6, the sleeve 1 and the grouting material, so the inner wall of the sleeve 1 does not need to be provided with a shear groove; the sleeve 1 transmits the axial tension of the stressed steel bar 9 through the piston 2 and the second plug 6 to resist pressure, and the sleeve 1 transmits the axial pressure of the stressed steel bar 9 through the piston 2 and the grouting material injected into the sleeve 1 or the overlapping of the connecting steel bar 3 and the sleeve 1. The inner diameter of the sleeve 1 and the strength of the grouting material are designed according to the axial pressure, so the force transmission path of the sleeve 1 is simple, clear and reliable.

[0035] A limiting steel bar 10 is arranged between the piston 2 and the first plug 5, one end of the limiting steel bar 10 is connected to the first end of the connecting steel bar 3, and the other end of the limiting steel bar 10 abuts against the inner side surface of the first plug 5; the setting of the above-mentioned limiting steel bar 10 can limit the piston 2 and prevent the piston 2 from blocking the grouting hole 7 during installation.

[0036] The grouting hole 7 and the slurry outlet hole 8 are both provided with rubber plugs for sealing the grouting hole 7 and the slurry outlet hole 8. The provision of the rubber plugs during the production process of the precast concrete component 4 can effectively prevent the concrete slurry from seeping into the interior of the sleeve 1.

[0037] A plastic film 11 is provided on the outer side of the second plug 6 to seal the through hole of the second plug 6 . The provision of the plastic film 11 during the production of the prefabricated concrete component 4 effectively prevents concrete slurry from seeping into the interior of the sleeve 1 .

[0038] The slurry outlet hole 8 and the inner side of the second plug 6 are arranged at a distance, and the distance between the slurry outlet hole 8 and the second plug 6 is consistent with the thickness of the piston 2; the above-mentioned structural setting can prevent the piston 2 from blocking the slurry outlet hole 8, thereby ensuring the smooth progress of the grouting construction.

[0039] The outer surface of the sleeve 1 is provided with a left-right symmetrical notch 12 centered on the axis of the sleeve 1. The notch 12 is 2 mm deep, 3 mm wide, and 1 / 4 of the circumference. The minimum wall thickness of the sleeve 1 is 3 mm. The provision of the above-mentioned notch 12 can increase the bond strength between the sleeve 1 and the concrete in the precast concrete component 4.

[0040] The first and second ends of the sleeve 1 are both provided with internal threads, and the outer surfaces of the first plug 5 and the second plug 6 are both provided with external threads throughout the length. The first plug 5 and the second plug 6 are both installed in the first and second ends of the sleeve 1 through a threaded structure; an internal thread is provided in the middle of the first plug 5, and the internal thread is threadedly connected to the end of the stressed steel bar 9; the structural setting of the above-mentioned sleeve 1 can achieve a stable connection with the first plug 5 and the second plug 6, and the setting of the internal thread on the first plug 5 can achieve a stable connection with the stressed steel bar 9.

[0041] The diameter of the piston 2 is adapted to the inner diameter of the sleeve 1. The diameter of the piston 2 is 1 mm smaller than the inner diameter of the sleeve 1. The outer surface of the piston 2 is smooth, which is conducive to the sliding of the piston 2 in the sleeve 1. A threaded hole is provided in the middle of the piston 2 for threaded connection with the connecting steel bar 3. The threaded hole can realize a stable connection between the piston 2 and the connecting steel bar 3.

[0042] A circular hole is provided in the middle of the second plug 6 , the diameter of which is 1-2 mm larger than the diameter of the connecting steel bar 3 .

[0043] A method for using a piston-type grouting sleeve suitable for a precast concrete component comprises the following steps:

[0044] S1. Produce precast concrete components with piston-type grouting sleeves in the factory and transport them to the construction site;

[0045] S2. Hoist the precast concrete component into position, align the piston-type grouting sleeve on the precast concrete component with the conventional grouting sleeve 15 on the first component, and lay a sealing rubber pad 16 between the precast concrete component and the first component. The first component is a precast concrete component or a concrete component cast on site and reaching a certain strength.

[0046] S3, inject grouting material into the conventional grouting sleeve 15, when the grouting material in the conventional grouting sleeve 15 overflows from the grouting hole;

[0047] S4, injecting grouting material into the piston-type grouting sleeve on the precast concrete component, and under the push of the grouting material, the piston 2 moves outward, thereby causing the connecting steel bar 3 to pierce the sealing plastic film 11 and extend out of the precast concrete component into the conventional grouting sleeve 15;

[0048] S5. When the piston 2 moves to the second plug 6, the grouting material overflows from the slurry outlet 8 of the piston grouting sleeve, and the grouting is completed. At the same time, the piston 2 moves to the second end of the piston grouting sleeve, and the connecting steel bar 3 can be completely inserted into the conventional grouting sleeve 15, making the grouting material in the conventional grouting sleeve 15 more dense and full, thereby improving the density of the grouting material in the conventional grouting sleeve 15 and realizing the connection between the prefabricated concrete component and the first component.

[0049] The beneficial technical effects of the present invention are:

[0050] 1. The present invention uses a piston-type grouting sleeve as an intermediate connecting component between the stressed steel bars 9 in the precast concrete component 4 and the conventional grouting sleeves 15 in other precast concrete components, thereby replacing the exposed reserved steel bars of the precast concrete component 4. Moreover, the precast concrete component 4 with the piston-type grouting sleeve has no exposed reserved steel bars on all sides, thereby solving a series of problems caused by the exposed reserved steel bars of the precast concrete component 4, such as high mold cost, low production efficiency, and unchanged lifting, and can effectively improve the production efficiency and shipping efficiency of the precast concrete component 4; solves the problem of misalignment between the reserved steel bars and the conventional grouting sleeves 15 after bending, deformation, and rust, ensures the smooth installation of the precast concrete component 4, improves the assembly construction efficiency, and effectively improves the work efficiency throughout the entire cycle of the prefabricated concrete building structure, with significant economic benefits.

[0051] 2. The present invention can achieve seamless installation between precast concrete components 4 during assembly. The construction site only needs to grout the sleeve 1 inside the precast concrete component 4, and there is no need to reserve space for pouring concrete on site, thereby realizing the "dry connection" of the precast concrete components 4, greatly reducing the wet operation of pouring in situ, achieving "four savings and one environmental protection", improving the environmental quality of the construction site, reducing carbon emissions at the construction site, and having significant environmental and social benefits.

[0052] 3. The present invention has a wide range of applications and can realize "dry connection" in various prefabricated reinforced concrete structural systems such as prefabricated reinforced concrete shear wall structures and prefabricated reinforced concrete frame structures. In addition, the force transmission path is simple, the force mechanism is simple, and the force transmission is reliable.

[0053] 4. It solves the problems of high mold production cost, low component production efficiency, inconvenient transportation and hoisting caused by the exposed reserved steel bars of traditional precast concrete components. It can also avoid on-site pouring of connection nodes, reduce on-site pouring wet operations, reduce formwork projects, and improve the construction site environment.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made using the contents of the present invention specification and its drawings are included in the scope of the present invention.

Claims

1. A piston-type grouting sleeve suitable for precast concrete components, characterized by: The piston grouting sleeve is arranged at the connecting end of the concrete precast component, and the piston grouting sleeve includes a sleeve, a piston and a connecting steel bar, and the sleeve is placed in the concrete precast component, and the outer side of the second end of the sleeve is flush with the end surface of the connecting end of the concrete precast component. The sleeve has a cylindrical structure, and a first plug is connected to the first end of the sleeve, and a second plug is connected to the second end of the sleeve. A grouting hole and a slurry outlet hole are provided on the sleeve between the first plug and the second plug, and the grouting hole is close to the first plug, and the slurry outlet hole is close to the second plug, and the grouting hole and the slurry outlet hole both extend outward from the concrete precast component; the piston is slidably installed in the sleeve, and the piston is located between the grouting hole and the slurry outlet hole on one side close to the grouting hole, and the grouting hole is located between the piston and the first plug; the connecting steel bar is placed inside the sleeve, and the first end of the connecting steel bar and the movable The first and second ends of the sleeve are connected, and a through hole is provided in the middle of the second plug, and the second end of the connecting steel bar is inserted into the through hole of the second plug; the first plug is connected to the stress-bearing steel bar in the precast concrete component; when grouting material is poured into the sleeve, the grouting material will push the piston to move toward the second end of the sleeve, thereby causing the connecting steel bar to extend out of the sleeve; a limiting steel bar is provided between the piston and the first plug, one end of the limiting steel bar is connected to the first end of the connecting steel bar, and the other end of the limiting steel bar abuts against the inner side surface of the first plug, and the first and second ends of the sleeve are both provided with internal threads, and the outer surfaces of the first and second plugs are both provided with external threads throughout the length, and the first and second plugs are both installed in the first and second ends of the sleeve through a threaded structure; an internal thread is provided in the middle of the first plug, and the internal thread is threadedly connected to the end of the stress-bearing steel bar.

2. The piston-type grouting sleeve suitable for precast concrete components according to claim 1, characterized in that: The grouting hole and the slurry outlet hole are both provided with rubber plugs for sealing the grouting hole and the slurry outlet hole.

3. The piston-type grouting sleeve suitable for precast concrete components according to claim 1, characterized in that: A plastic film is provided on the outer side of the second plug to seal the through hole of the second plug.

4. The piston-type grouting sleeve suitable for precast concrete components according to claim 1, characterized in that: The slurry outlet hole and the inner side of the second plug are arranged at a distance, and the distance between the slurry outlet hole and the second plug is consistent with the thickness of the piston.

5. The piston-type grouting sleeve suitable for precast concrete components according to claim 1, characterized in that: The outer surface of the sleeve is provided with left-right symmetrical notches with the sleeve axis as the center.

6. The piston-type grouting sleeve suitable for precast concrete components according to claim 1, characterized in that: The diameter of the piston is matched with the inner diameter of the sleeve, and a threaded hole for threaded connection with the connecting steel bar is provided in the middle of the piston.

7. The piston-type grouting sleeve suitable for precast concrete components according to claim 1, characterized in that: A circular hole is provided in the middle of the second plug, the diameter of which is 1-2 mm larger than the diameter of the connecting steel bar.

8. A method for using a piston-type grouting sleeve suitable for precast concrete components according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Produce precast concrete components with piston-type grouting sleeves in the factory and transport them to the construction site; S2. Hoist the precast concrete component into place, align the piston-type grouting sleeve on the precast concrete component with the conventional grouting sleeve on the first component, and lay a sealing rubber pad between the precast concrete component and the first component; S3, inject grouting material into the conventional grouting sleeve until the grouting material in the conventional grouting sleeve overflows from the grouting hole; S4. Inject grouting material into the piston-type grouting sleeve on the precast concrete component. Pushed by the grouting material, the piston moves outward, thereby causing the connecting steel bar to extend out of the precast concrete component and enter the conventional grouting sleeve. S5. When the piston moves to the second plug, the grouting material overflows from the slurry outlet of the piston grouting sleeve, and the grouting is completed. At the same time, the piston moves to the second end of the piston grouting sleeve, and the connecting steel bar can be completely inserted into the conventional grouting sleeve to realize the connection between the precast concrete component and the first component.

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