A device and method for installing a limit stop block in a grouting sleeve for connecting steel bars

Abstract

The present invention discloses an installation device and method for a limit stopper in a grouting sleeve for connecting steel bars, comprising a base, a fixed pressure rod arranged on the base, a grouting sleeve sleeved outside the fixed pressure rod, a limit stopper obliquely placed in the grouting sleeve, a movable pressure rod placed on the limit stopper, a pressure device is arranged above the movable pressure rod, wherein the length of the limit stopper is greater than the inner diameter of the grouting sleeve. The pressure device applies pressure to the movable pressure rod so that the steel bar limit stopper forms an interference fit with the inner diameter of the grouting sleeve, thereby realizing the mechanical positioning of the steel bar in the grouting sleeve and playing a one-way positioning role when the prefabricated end is installed in the factory. The present invention avoids drilling and tapping on the surface of the grouting sleeve by pressing the limit stopper, thereby ensuring the integrity and sealing of the grouting sleeve; the limit stopper and the grouting sleeve have an interference fit to ensure stability, and the installation process of the limit stopper saves time and effort, thereby improving production efficiency.

Description

Technical Field

[0001] The invention belongs to the field of construction industry, and in particular relates to a device and method for installing a limit stopper in a grouting sleeve for connecting steel bars. Background Art

[0002] As an important component for connecting steel bars during on-site construction, the grouting sleeve for steel bar connection is a part that connects the threaded steel bars in adjacent reinforced concrete building components. With the development of prefabricated buildings, its application has become more and more mature. The grouting sleeve solves the problem of inconvenient connection of prefabricated on-site steel bars. The use of the grouting sleeve makes on-site assembly construction in the construction industry possible, greatly improving the efficiency of construction and saving time, manpower and site costs.

[0003] Patent CN201910952627.X discloses a pre-grouting full grouting sleeve structure and construction method, including a slurry barrel, a grouting hole is provided on the barrel wall of the slurry barrel, barrel mouth seals are respectively provided at the barrel mouths of both ends of the slurry barrel, and a grouting mouth seal is provided at the overflow mouth of the grouting hole, and the grouting material is filled in the slurry barrel. However, there is no limit structure in the middle of the grouting sleeve, and the center limit of the grouting sleeve is directly related to the insertion depth of the steel bar whether in the prefabricated component factory or in the assembly at the construction site, thereby affecting the reliability of the sleeve connection. Therefore, the center limit of the grouting sleeve plays a pivotal role in the use process.

[0004] At present, the center limit of the machined grouting sleeve mainly adopts the method of tapping the center of the sleeve, screwing in a screw or opening a through hole to insert a limit block. For example, Chinese patent CN110524189A discloses a method for making a grouting sleeve, which includes the following steps: Step 1: Cutting a steel pipe by a sawing machine to obtain a sleeve body; Step 2: Pressing a groove on the outer tube wall of the sleeve body by a crimping machine; Step 3: Cone the two end ports of the sleeve body by a hydraulic double-head or single-head shrinking machine; Step 4: Drilling the sleeve body by a drilling machine and a mold to obtain a grouting hole and a grouting hole located near the two ends of the sleeve body, and a middle hole located in the middle of the sleeve body; Step 5: Tapping the grouting hole, the grouting hole and the middle hole by a tapping machine; Step 6: Using a pneumatic wrench to install the grouting part, the grouting part and the middle limit screw at the grouting hole, the grouting hole and the middle hole respectively; Step 7: Removing impurities on the inner and outer walls of the grouting sleeve by a shot blasting machine. However, drilling holes and tapping on the side wall of the sleeve will destroy the structure of the sleeve and reduce the sealing performance of the steel bar connection; the thread is easily damaged, resulting in the loss of the sleeve and the screw; and the processing method is complicated, which increases the manpower and time costs and leads to low efficiency. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a device and method for installing a limit stop block in a grouting sleeve for steel bar connection, so that the integrity and sealing of the grouting sleeve will not be destroyed, the limit stop block can be installed stably, has good positioning strength, and the installation process saves time and effort.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A mounting device for a limit stop block in a grouting sleeve for steel bar connection comprises a base, a fixed pressure rod arranged on the base, a grouting sleeve sleeved on the outside of the fixed pressure rod, a limit stop block obliquely placed in the grouting sleeve, a movable pressure rod inserted into the grouting sleeve and the movable pressure rod placed on the limit stop block, a pressure device is arranged above the movable pressure rod, wherein the length of the limit stop block is greater than the inner diameter of the grouting sleeve.

[0008] The specific method of installing the limit stopper in the middle of the grouting sleeve using the device is as follows: the grouting sleeve is sleeved on the fixed pressure rod, and the height of the fixed pressure rod limits the position of the limit stopper. Then, the limit stopper whose length is greater than the inner diameter of the grouting sleeve is placed obliquely into the grouting sleeve, and then the movable pressure rod is placed above the limit stopper, and a vertical downward pressure is applied to the movable pressure rod through the pressure device above the movable pressure rod. The pressure is transmitted to the limit stopper, and the limit stopper is limited by the position of the fixed pressure rod in the grouting sleeve. Therefore, the limit stopper changes from tilt to horizontal under the action of external force. And under the extrusion of the limit stopper, the inner wall of the grouting sleeve will produce a certain deformation to form a groove for fixing the limit stopper, that is, the limit stopper and the grouting sleeve are connected in an interference fit.

[0009] Preferably, the length of the limit stopper is 1-2 mm larger than the inner diameter of the grouting sleeve. If the limit stopper is too long, it will exceed the deformation of the grouting sleeve and damage the grouting sleeve. If the limit stopper is too short, the limit stopper cannot be fixed and is easy to slide or fall off in the grouting sleeve.

[0010] Preferably, the upper end surface of the fixed pressure rod is detachably connected with a replaceable pressure head 1, and the lower end surface of the movable pressure rod is detachably connected with a replaceable pressure head 2. The lower end surface of the movable pressure rod and the upper end surface of the fixed pressure rod are both main stress points, which will be worn or damaged after long-term use. Therefore, the lower end surface of the movable pressure rod and the upper end surface of the fixed pressure rod are detachably connected with the replaceable pressure head 1 and the replaceable pressure head 2 respectively, which can be replaced regularly, thereby enhancing the service life of the fixed pressure rod and the movable pressure rod and saving replacement costs.

[0011] Preferably, the upper end surface of the fixed pressure rod is provided with a pin hole 1, and the lower end surface of the replaceable pressure head 1 is provided with a pin 1, and the pin hole 1 and the pin 1 are clearance-matched. The fixed pressure rod and the replaceable pressure head 1 are clearance-matched through the pin shaft, which is convenient for installation and disassembly.

[0012] Preferably, the lower end surface of the movable pressure rod is provided with a second pin hole, a neodymium magnet is provided in the second pin hole, and the upper end surface of the second replaceable pressure head is provided with a second pin, and the second pin hole and the second pin are clearance-matched and connected through the neodymium magnet. The movable pressure rod and the second replaceable pressure head are clearance-matched through the pin shaft, which is convenient for installation and disassembly. At the same time, the movable pressure rod and the second replaceable pressure head are also adsorbed and connected through the neodymium magnet. The strong magnetism of the neodymium magnet can prevent the second replaceable pressure head from separating from the movable pressure rod under the action of gravity, and does not affect the force transmission process when the upper pressure device applies pressure.

[0013] Preferably, the replaceable pressure head 1 and the replaceable pressure head 2 are made of alloy steel with a hardness greater than HRC55, and the fixed pressure rod and the movable pressure rod are made of carbon structural steel. The replaceable pressure head 1 and the replaceable pressure head 2 are the main stress points, so they have higher strength and hardness than the fixed pressure rod and the movable pressure rod, can meet the use requirements of high-intensity work, and have high reliability and long service life.

[0014] Preferably, an annular groove is provided in the middle of the grouting sleeve, and a protrusion is formed on the inner surface of the grouting sleeve corresponding to the annular groove. An annular groove is processed in advance on the outer surface of the grouting sleeve corresponding to the installation position of the limit stopper, and a protrusion can be formed on the inner surface of the grouting sleeve corresponding to the annular groove through extrusion, which restricts the limit stopper and prevents the limit stopper from sliding or falling off, so that the limit stopper can achieve mechanical positioning of the steel bar in the grouting sleeve under the combined effect of interference fit and the protrusion.

[0015] Preferably, the upper end of the movable pressure rod is 30-50 mm higher than the upper end of the grouting sleeve, which is not only conducive to applying pressure on the upper part of the movable pressure rod, but also convenient for installing and removing the movable pressure rod.

[0016] Preferably, the fixed pressure rod is connected to the base by a pin, so as to facilitate the installation and removal of the fixed pressure rod and the base.

[0017] A method for using an installation device for a limit stop in a grouting sleeve for connecting steel bars, wherein the pressure device applies vertical downward pressure to the movable pressure rod, so that the limit stop changes from being inclined to being horizontal, and the limit stop is interference-fitted with the grouting sleeve.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The limit stopper is installed by a press-in method to avoid drilling and tapping on the surface of the grouting sleeve, thereby ensuring the integrity of the grouting sleeve and not damaging the integrity of the grouting sleeve. The middle part of the grouting sleeve will not be weakened by drilling, and the sealing performance of the grouting sleeve will not be affected.

[0020] (2) The limit stopper is interference fit with the inner wall of the grouting sleeve and is fixed by an annular pressure groove, which makes the fixation of the limit stopper more stable and avoids sliding or falling off of the limit stopper. The positioning strength is good, and the material of the limit stopper is excellent and has high hardness.

[0021] (3) A replaceable pressure head is detachably connected to the upper end surface of the fixed pressure rod and the lower end surface of the movable pressure rod. The pressure head can be replaced regularly, thereby enhancing the service life of the fixed pressure rod and the movable pressure rod and saving replacement costs. In addition, the replaceable pressure head has a higher hardness and can meet the use requirements of high-intensity work.

[0022] (4) The device makes the installation process of the limit stopper simple, fast, time-saving and labor-saving, and greatly improves production efficiency.

[0023] (5) The limit stopper is easy to install. There is no need for a series of processes such as drilling, tapping, and screwing into threads. The installation can be completed by clamping once, which saves processes and greatly reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view of the installation device of the limit stop block in the grouting sleeve for connecting steel bars in Example 1 of the present invention;

[0025] Figure 2 It is a cross-sectional view of the grouting sleeve after the limit stopper is installed in Example 1 of the present invention;

[0026] Figure 3 It is a top view of the grouting sleeve after the limit stopper is installed in Example 1 of the present invention;

[0027] Figure 4 It is a cross-sectional view of the installation device of the limit stop block in the grouting sleeve for connecting steel bars in Example 2 of the present invention;

[0028] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0029] In the figure: 1. base; 2. fixed pressure rod; 3. replaceable pressure head 1; 4. grouting sleeve; 41. grouting hole; 42. grouting hole; 5. limit block; 6. movable pressure rod; 7. replaceable pressure head 2; 8. pressure device; 9. neodymium magnet; 10. annular pressure groove. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] As attached Figure 1-3 The present embodiment provides an installation device for a limit stopper in a grouting sleeve for connecting steel bars, comprising a base 1, a fixed pressure rod 2 connected to the base 1 by a pin shaft, a pin hole 1 being provided on the upper end surface of the fixed pressure rod 2, and a pin 1 being provided on the lower end surface of a replaceable pressure head 3, wherein the fixed pressure rod 2 and the replaceable pressure head 3 are connected by a pin shaft clearance fit to facilitate the installation and removal of the replaceable pressure head 3. A grouting sleeve 4 is sleeved on the outer side of the fixed pressure rod 2 to fix the grouting sleeve 4, and then a limit stopper 5 having a length 1 mm larger than the inner diameter of the grouting sleeve 4 is placed obliquely in the grouting sleeve 4, and then a movable pressure rod 6 is inserted into the grouting sleeve 4 and the movable pressure rod 6 is placed on the limit stopper 5. The upper end of the installed movable pressure rod 6 is 30 mm higher than the upper end of the grouting sleeve 4, which is convenient for the subsequent removal of the movable pressure rod 6, and the lower end surface of the movable pressure rod 6 is provided with two pin holes, and the upper end surface of the replaceable pressure head 2 7 is provided with two pins. The movable pressure rod 6 and the replaceable pressure head 2 7 are connected by the clearance fit of the pin shaft to facilitate the installation and removal of the replaceable pressure head 2 7. A pressure device 8 is provided above the movable pressure rod 6, and the pressure device 8 is a hydraulic press.

[0033] The grouting sleeve 4 includes a grouting hole 41 arranged at the bottom and a grouting hole 42 arranged at the top, and the material of the grouting sleeve 4 is 45# steel, and its elastic modulus is 210Gpa. At the same time, the material of the fixed pressure rod 2 and the movable pressure rod 6 is also 45# steel, and its hardness after heat treatment is HRC53, the tensile strength is 600MPa, and the yield strength is 355Mpa, while the material of the replaceable pressure head 1 3, the replaceable pressure head 2 7 and the limit stopper 5 is 42CrMo4 after quenching and tempering, and its hardness is HRC60, the tensile strength is 1080Mpa, and the yield strength is 930Mpa.

[0034] The specific installation process of the limit stopper 5 is as follows: the pressure device 8 applies a vertical downward pressure to the movable pressure rod 6, and the pressure is transmitted to the replaceable pressure head 7 and the limit stopper 5 in turn. The limit stopper 5 is limited by the position of the fixed pressure rod 2 in the grouting sleeve 4, so the limit stopper 5 changes from tilting to horizontal under the action of external force. When installing the limit stopper 5, since the grouting sleeve 4 has a certain elasticity and ductility, the limit stopper 5 squeezes the grouting sleeve 4 so that the inner wall of the grouting sleeve 4 is deformed to form a groove for fixing the limit stopper 5. The limit stopper 5 forms an interference fit with the grouting sleeve 4 to prevent the limit stopper 5 from sliding or falling off. Then take out the movable pressure rod 6, and remove the grouting sleeve 4 from the fixed pressure rod 2, and the installation of the limit stopper 5 in the grouting sleeve 4 is completed. One-way positioning can be achieved when the steel bars are inserted into the prefabricated end during factory installation. Subsequently, the steel bars are inserted into the two ends of the grouting sleeve 4 and limited by the limit block 5, thereby limiting the insertion depth of the steel bars and ensuring the reliability of the grouting sleeve connection. Then, grout is poured into the grouting sleeve 4 through the grouting hole 41 for fixing.

[0035] Example 2

[0036] As attached Figure 4-5 As shown, the difference between this embodiment and embodiment 1 is that: (1) a neodymium magnet 9 is provided in the pin hole 2 of the movable pressure rod 6, and the neodymium magnet 9 can absorb the replaceable pressure head 2 7 to prevent the replaceable pressure head 2 7 from falling off from the movable pressure rod 6 under the action of gravity, and the neodymium magnet 9 will not affect the transmission of force when the hydraulic press applies pressure; (2) in the early stage of processing the grouting sleeve 4, an annular groove 10 is pressed out in advance on the outer surface of the grouting sleeve corresponding to the installation position of the limit stopper. Through the extrusion effect, a protrusion is formed on the inner surface of the grouting sleeve 4 corresponding to the annular groove 10. The protrusion can be used to fix the limit stopper 5 to prevent the limit stopper 5 from sliding or falling off, so that the limit stopper 5 can achieve mechanical positioning of the steel bar in the grouting sleeve under the combined action of interference fit and the protrusion; (3) the length of the limit stopper 5 is 2 mm larger than the inner diameter of the grouting sleeve 4.

[0037] Comparative Example 1

[0038] The difference between this comparative example and Example 2 is that the length of the limit stopper 5 is 3 mm larger than the inner diameter of the grouting sleeve 4. During the processing, the limit stopper 5 is too long, which exceeds the deformation of the grouting sleeve 4, resulting in the rupture of the grouting sleeve 4.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An installation device for a limit stopper in a grouting sleeve for connecting steel bars, characterized in that: The invention comprises a base (1), a fixed pressure rod (2) arranged on the base (1), a grouting sleeve (4) sleeved on the outside of the fixed pressure rod (2), a limit stopper (5) obliquely placed in the grouting sleeve (4), a movable pressure rod (6) inserted into the grouting sleeve (4) and the movable pressure rod (6) placed on the limit stopper (5), a pressure device (8) is provided above the movable pressure rod (6), wherein the length of the limit stopper (5) is greater than the inner diameter of the grouting sleeve (4); the upper end surface of the fixed pressure rod (2) is detachably connected to a replaceable pressure head 1 (3), the lower end surface of the movable pressure rod (6) is detachably connected to a replaceable pressure head 2 (7), and the fixed pressure rod (2) is connected to the base (1) by a pin shaft.

2. The installation device of the inner limit stopper of the grouting sleeve for steel bar connection according to claim 1 is characterized in that: The length of the limit stopper (5) is 1-2 mm greater than the inner diameter of the grouting sleeve (4).

3. The installation device of the inner limit stopper of the grouting sleeve for steel bar connection according to claim 1 is characterized in that: The upper end surface of the fixed pressure rod (2) is provided with a pin hole 1, and the lower end surface of the replaceable pressure head 1 (3) is provided with a pin 1, and the pin hole 1 and the pin 1 are clearance-matched.

4. The installation device of the inner limit stopper of the grouting sleeve for steel bar connection according to claim 1 is characterized in that: The lower end surface of the movable pressure rod (6) is provided with a second pin hole, in which a neodymium magnet (9) is arranged; the upper end surface of the second replaceable pressure head (7) is provided with a second pin, and the second pin hole and the second pin are clearance-matched and adsorbed and connected by the neodymium magnet (9).

5. The installation device of the inner limit stopper of the grouting sleeve for steel bar connection according to claim 1 is characterized in that: The material of the replaceable pressure head 1 (3) and the replaceable pressure head 2 (7) is alloy steel with a hardness greater than HRC55, and the material of the fixed pressure rod (2) and the movable pressure rod (6) is carbon structural steel.

6. The installation device of the inner limit stopper of the grouting sleeve for steel bar connection according to claim 1, characterized in that: An annular pressing groove (10) is provided in the middle of the grouting sleeve (4), and a protrusion is formed on the inner surface of the grouting sleeve (4) corresponding to the annular pressing groove (10).

7. The installation device of the inner limit stopper of the grouting sleeve for steel bar connection according to claim 1 is characterized in that: The upper end of the movable pressure rod (6) is 30-50 mm higher than the upper end of the grouting sleeve (4).

8. A method for using the installation device of the inner limit stopper of the grouting sleeve for connecting steel bars according to any one of claims 1 to 7, characterized in that: The pressure device (8) applies vertical downward pressure to the movable pressure rod (6), so that the limit stopper (5) changes from being inclined to being horizontal, and the limit stopper (5) and the grouting sleeve (4) are interference-fitted.

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