Connection joint for steel sleeve grouting

Abstract

The utility model discloses a connecting joint for steel sleeve grouting, including the grouting pipe with grouting channel and the pressure -sustaining pipe with the storage grout channel, the grouting channel has the feed port for the grouting equipment outlet grout end intercommunication, and the discharge port for the steel sleeve grouting hole intercommunication, the feed port is controlled and opens and closes, the storage grout channel has the pressure -sustaining cabin that the volume is controlled and increases or reduces, the pressure -sustaining cabin is connected to the grouting channel, and the pressure -sustaining cabin is applied and has the pre -stress that makes its volume relatively reduces, can strengthen grouting reliability and effectiveness, overcome the defect that steel sleeve grouting grouting material is not full.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and specifically to a connection joint for grouting of steel bar sleeves. Background Technology

[0002] Grouting connection technology for reinforcing bars has been widely used in prefabricated buildings. This technology involves injecting a high-strength, non-shrink grout mixture into ribbed reinforcing bars and grooved or textured metal sleeves. After the grout hardens, a tight interlocking structure forms between the grout, the transverse ribs of the reinforcing bars, and the inner wall of the sleeve, creating a composite connection of mechanical interlocking and chemical bonding, thus achieving a reliable connection of the reinforcing bars. However, in actual construction, defects such as incomplete or insufficient grouting due to grout leakage and backflow frequently occur. These problems can seriously affect the mechanical properties of the connectors and reduce the overall stability of the structure.

[0003] Currently, the main approach is to strengthen process management, such as recording and archiving the entire grouting process. However, it is still impossible to effectively control the outflow of grout during the removal of the grouting pipe from the precast component, nor can it be known in real time whether the grout is full inside the grouting section. Later, the fullness of the grouting of the sleeve can only be detected by X-ray and endoscopy methods to determine whether it meets the requirements of relevant specifications. However, due to its concealed construction and component integration, it is difficult to find a way to remedy the situation once the grouting quality is found to be substandard. Generally, the component is cut off or removed, the connecting steel bars are retained, and a new component is reinstalled and grouting is carried out, resulting in low construction efficiency.

[0004] Therefore, to solve the above problems, a connection joint for grouting of steel bar sleeves is needed to enhance the reliability and effectiveness of grouting and overcome the defect of incomplete grouting material in steel bar sleeve grouting. Utility Model Content

[0005] In view of this, the purpose of this utility model is to overcome the defects in the prior art and provide a connection joint for grouting of steel bar sleeves, which can enhance the reliability and effectiveness of grouting and overcome the defect of incomplete grouting material in steel bar sleeve grouting.

[0006] The present invention relates to a connecting joint for grouting of reinforcing bar sleeves, comprising a grouting pipe having a grouting channel and a pressure-holding pipe having a grout storage channel; the grouting channel has an inlet for connecting to the grout outlet of the grouting equipment and an outlet for connecting to the grouting hole of the reinforcing bar sleeve, the inlet being controlled to open and close, and the outlet being controlled to open and close.

[0007] The slurry storage channel has a pressure-holding chamber whose volume is controlled to increase or decrease. The pressure-holding chamber is connected to the grouting channel and is subjected to prestress that relatively reduces its volume.

[0008] Furthermore, the outlet of the grouting pipe used to connect the grouting hole of the reinforcing bar sleeve is provided with a rubber plug. The rubber plug has a built-in channel connecting the grouting hole of the reinforcing bar sleeve and the outlet. The rubber plug is sleeved on the end of the grouting pipe 1 and is tapered with a smaller front end and a larger rear end.

[0009] Furthermore, the slurry storage channel is equipped with a pressure stabilizing component that divides the slurry storage channel into a pressure-holding chamber and a power chamber. The pressure stabilizing component is driven to move within the slurry storage channel so that the volume of the pressure-holding chamber can be controlled to increase or decrease.

[0010] Furthermore, a seal is provided between the pressure stabilizing component and the slurry storage channel to seal and separate the pressure holding chamber and the power chamber.

[0011] Furthermore, along the movement path of the pressure stabilizer within the slurry storage channel, the pressure-holding pipe is equipped with an observation window for monitoring the position of the pressure stabilizer within the slurry storage channel.

[0012] Furthermore, along the movement path of the pressure stabilizer within the slurry storage channel, the observation window has pressure markings for indicating the pressure inside the pressure chamber.

[0013] Furthermore, the slurry storage channel is a straight channel, and the pressure stabilizing component is built into the slurry storage channel to divide the slurry storage channel into a pressure-holding chamber and a power chamber. The power chamber is equipped with an elastic component that applies prestress to the pressure stabilizing component.

[0014] Furthermore, the slurry storage channel has an end cap at the end with the power compartment, and the elastic element is limited between the pressure stabilizing element and the end cap.

[0015] Furthermore, the end cap is provided with a balance hole.

[0016] Furthermore, a blocking part is provided at the interface position between the pressure-holding chamber and the grouting channel.

[0017] This solution also discloses a grouting method for rebar sleeves based on the aforementioned connection joint for rebar sleeve grouting, including the following steps:

[0018] S1. After the steel bar sleeve is installed on the precast foundation, the grout outlet end of the grouting equipment is connected to the grouting hole located at the bottom of the steel bar sleeve through the grouting pipe with grouting channel;

[0019] S2. Start the grouting equipment to grout the inside of the steel reinforcement sleeve;

[0020] S3. After grouting is completed, seal the vent hole at the top of the steel sleeve and close the outlet of the grouting pipe;

[0021] S4. Continue grouting the pressure holding chamber until the pressure stabilizer is located in the predetermined position in the grout storage channel. Indicate the pressure in the pressure holding chamber by the pressure markings.

[0022] S5. Shut down the grouting equipment and close the inlet of the grouting pipe;

[0023] S6. Open the outlet of the grouting pipe to connect the grouting channel with the steel sleeve, and apply prestress to the pressure stabilizing component;

[0024] S7. Monitor the pressure markings indicated by the voltage regulator;

[0025] If the indicated pressure value drops to the preset warning value, repeat steps S2 to S6 to fill the steel sleeve with grout.

[0026] S8. After the concrete has cured, remove the connection joint used for grouting the steel reinforcement sleeve.

[0027] The beneficial effects of this utility model are as follows: The connection joint for grouting of steel bar sleeves disclosed in this utility model can directly obtain the grout pressure value in the grouting sleeve of the PC component through the pressure value indicated by the pressure stabilizer, thereby judging the fullness of the grouting material in the steel bar sleeve. It can transform the fullness of the grouting material from qualitative analysis to quantitative analysis, thereby ensuring the construction quality. Moreover, if the grouting is not full or dense, the automatic compensation mechanism can replenish the grouting sleeve in time. In particular, if the pressure is lower than the warning value, the outside can actively replenish the grout in time to prevent the above-mentioned defects. This solution can save grout, and the construction is simple and more environmentally friendly. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a schematic cross-sectional view of the structure of this utility model;

[0031] Figure 3 This is a schematic diagram of the connection joint for grouting of steel bar sleeves according to this utility model. Detailed Implementation

[0032] Figures 1-3As shown in the figure, the connecting joint for grouting of the reinforcing bar sleeve in this embodiment includes a grouting pipe 1 with a grouting channel and a pressure-holding pipe 2 with a grout storage channel. The grouting channel has an inlet 21 for connecting to the grout outlet of the grouting equipment and an outlet 22 for connecting to the grouting hole of the reinforcing bar sleeve. The inlet 21 is controlled to open and close. The grout storage channel has a pressure-holding chamber 11 whose volume is controlled to increase or decrease. The pressure-holding chamber 11 is connected to the grouting channel and is subjected to prestress that relatively reduces its volume. In use, the grouting pipe 1 connects the grout outlet of the grouting equipment to the grouting hole located at the bottom of the rebar sleeve through the grouting channel. Grout is also injected into the grouting channel and the pressure-holding chamber 11, and the pressure-holding chamber 11 is prestressed to maintain the pressure of the grout in the rebar sleeve. During the grouting of the rebar sleeve, the inlet 21 connected to the grout outlet of the grouting equipment is opened. After the grouting of the rebar sleeve is completed, the pressure-holding grouting continues. The volume of the pressure-holding chamber 11 increases due to the continuous injection of grout into it. In this state, the pressure-holding chamber 11 has a certain initial pre-pressure. By closing the inlet 21 connected to the grout outlet of the grouting equipment, the pressure of the pressure-holding chamber 11 with a certain pressure is balanced with the grout pressure in the rebar sleeve. This effectively controls the outflow of grout in the rebar sleeve, enhances the reliability and effectiveness of the rebar sleeve grouting, reduces problems such as incomplete or non-dense grouting caused by grout leakage and backflow, and overcomes the defect of incomplete grouting in the rebar sleeve grouting.

[0033] In this embodiment, the outlet 22 is controlled to open and close to further enhance grouting stability. Specifically, the outlet 22 is opened during grouting, and after the grouting of the rebar sleeve is completed, the outlet 22 can be closed. Grouting continues to be applied to the pressure-holding chamber 11 until the preset pressure target is reached. Then, the inlet 21 is closed while the outlet 22 is opened, forming a pressure-holding structure that connects the rebar sleeve and the pressure-holding chamber 11. This reduces the impact of pressure fluctuations during pipe pulling of the grouting equipment on the grout pressure inside the rebar sleeve, while maintaining a certain pressure inside the rebar sleeve, thus improving the fullness and density of the grouting inside the rebar sleeve.

[0034] In this embodiment, a pressure stabilizing component 13 is provided within the slurry storage channel, dividing the channel into a pressure-holding chamber 11 and a power chamber 12. The pressure stabilizing component 13 is driven to shift within the slurry storage channel, thereby controlling the increase or decrease in the volume of the pressure-holding chamber 11. A sealing element is provided between the pressure stabilizing component 13 and the slurry storage channel to seal and separate the pressure-holding chamber 11 and the power chamber 12. That is, the pressure stabilizing component 13 is dynamically sealed within the slurry storage channel. The installation of the pressure stabilizing component 13 further improves the reliability of controlling the volume of the pressure-holding chamber 11, further simplifies the structure of the connection joint used for rebar sleeve grouting, reduces operational difficulty, enhances the versatility of this solution, and facilitates its widespread application in building construction.

[0035] In this embodiment, along the movement path of the pressure stabilizer 13 within the slurry storage channel, the pressure-holding pipe 2 is provided with an observation window for monitoring the position of the pressure stabilizer 13 within the slurry storage channel. The observation window has pressure markings 14 indicating the pressure inside the pressure-holding chamber 11, with each marking indicating a corresponding pressure value. By observing the position of the pressure stabilizer 13 at the corresponding pressure marking 14 on the observation window, the pressure holding pressure within the rebar sleeve can be monitored more intuitively. Furthermore, this mechanical tool, compared to electrically controlled monitoring methods, reduces application costs and operational difficulty, simplifies the device structure, facilitates worker operation, and the absence of electricity ensures construction safety and facilitates recycling and reuse.

[0036] In this embodiment, the slurry storage channel is a straight channel, and the pressure stabilizing component 13 is built into the slurry storage channel to divide the slurry storage channel into a pressure-holding chamber 11 and a power chamber 12. The power chamber 12 is provided with an elastic component 15 that applies prestress to the pressure stabilizing component 13. The end of the slurry storage channel with the power chamber 12 is provided with an end cap 16, and the elastic component 15 is limited between the pressure stabilizing component 13 and the end cap 16. The end cap 16 is provided with a balance hole 17.

[0037] In this embodiment, the pressure-holding pipe 2 is a straight tube with a certain light transmittance, which eliminates the need for opening a window and setting a transparent partition, saving processes and simplifying the structure. It also does not affect the dynamic sealing conditions of the pressure stabilizing component 13 during use, thus improving the effectiveness of tool use. The light transmittance of the pressure-holding pipe 2 exceeds 70%, which can be achieved by any of the existing acrylic pipes, rigid PVC pipes, or other materials. This solution uses an acrylic pipe, which will not be elaborated here. Of course, the pressure-holding pipe 2 can also be a pipe structure with an opening window. The purpose of this solution can also be achieved by setting a transparent plate to block the window, which will not be elaborated here.

[0038] In this embodiment, pressure markings 14 are engraved on the outer wall of the pressure-holding pipe 2 at corresponding locations along its length. This allows for real-time indication of the pressure inside the pressure-holding chamber 11 based on the location of the pressure stabilizer 13. The pressure markings 14 also include warning values. During the pressure-holding process of the rebar sleeve, when the pressure stabilizer 13 moves to the warning value within the pressure-holding pipe 2, grout is promptly added to the inside of the rebar sleeve. This solution obtains pressure data through direct observation. An alarm device can also be installed to monitor the internal pressure of the pressure-holding chamber 11, providing a warning when the pressure inside the pressure-holding chamber 11 reaches the alarm level. Further details are omitted here.

[0039] In this embodiment, the pressure stabilizing component 13 is built into the pressure holding tube 2 to form a piston structure. The pressure stabilizing component 13 is preferably made of elastic rubber. When it is installed in the pressure holding tube 2, it is interference-fitted with the pressure holding chamber 11 to form a sealed environment, which can eliminate the need for a seal and reduce the manufacturing cost of the tool. Of course, the seal can also be arranged between the pressure stabilizing component 13 and the pressure holding tube 2 according to the corresponding application environment to further increase the sealing capacity, which will not be elaborated here.

[0040] In this embodiment, a blocking part 18 is provided at the interface position of the pressure holding chamber 11 connecting to the grouting channel to prevent the pressure stabilizing component 13 from detaching from the pressure holding pipe 2, thereby improving the reliability of this tool. In this solution, the blocking part 18 is a ring shape that blocks the interface between the pressure holding chamber 11 and the grouting channel. In this solution, the blocking part 18 is directly formed on the pressure holding pipe 2. In actual application, it can also be set on the pressure holding pipe 2 as an accessory, which will not be described in detail here.

[0041] In this embodiment, the elastic element 15 is a spring, and the preload provided by the spring corresponds to the pressure value inside the pressure chamber 11. This solution also includes a detachable end cap 16 connected to the pressure-holding pipe 2. The end cap 16, together with the pressure stabilizing element 13, limits the spring to the power chamber 12. The detachable connection in this solution is a threaded connection. It has the feature of replacing parts and the connection is reliable. Of course, this position can be set with a corresponding connection method according to the requirements, such as a pin-fitting limiting method or a flip-cover design limiting method, etc., which will not be elaborated here.

[0042] In this embodiment, the end cap 16 is provided with a balance hole 17 to facilitate the reliable displacement of the pressure stabilizing component 13 in the slurry storage channel and reduce displacement resistance.

[0043] In another embodiment, the balance hole 17 of the end cap 16 is provided with a pressure holding cavity that connects to the power compartment 12. The pressure holding cavity has a certain extensibility and reset capability. During the process of the pressure stabilizing component 13 being lifted by the slurry, the extensibility of the pressure holding cavity increases its internal volume, and due to its reset capability, it forms pressure on the pressure stabilizing component 13. The auxiliary elastic component 15 applies pressure to the pressure stabilizing component 13. Preferably, the end cap 16 is provided with a rubber sheet that resembles a balloon to form the above structure.

[0044] In this embodiment, the pressure-holding pipe 2 and the grouting pipe 1 are integrally formed and form a "T" shape after being connected. The pressure-holding pipe 2 is connected to the middle of the grouting pipe 1. In actual use, the pressure-holding pipe 2 and the grouting pipe 1 can also be separate structures, which can be assembled into a whole using existing connection methods, such as connecting the intermediate pipes, bonding, or using sealant for interference fit. These will not be elaborated here.

[0045] In this embodiment, the inlet 21 of the grouting pipe 1, which is used to connect the grout outlet end of the grouting equipment, is a tapered opening with a larger rear end and a smaller front end, and has built-in threads. The inlet 21 also has a built-in sealing gasket, which is adapted to the tapered surface structure of the grout outlet end of the grouting equipment to prevent grout leakage. Any kind of check valve 23 in the prior art is set at the small diameter end of the inlet 21 to ensure that the grout does not flow back in reverse and to ensure the internal pressure of the grouting. This will not be elaborated further here.

[0046] In this embodiment, the outlet 22 of the grouting pipe 1, which is used to connect the grouting hole of the rebar sleeve, is provided with a rubber plug 25. The rubber plug 25 has a built-in channel connecting the grouting hole of the rebar sleeve and the outlet 22. The rubber plug 25 is sleeved on the end of the grouting pipe 1 and is tapered with a smaller front end and a larger rear end to fit the diameter of the grouting hole of the rebar sleeve and prevent grout leakage. Any of the prior art shut-off valves 24 is provided at the outlet 22 to control the opening and closing of the outlet 22 and realize the on / off of grouting. Further details are omitted here.

[0047] This solution also discloses a grouting method for rebar sleeves based on the aforementioned connection joint for rebar sleeve grouting, including the following steps:

[0048] S1. After the steel bar sleeve 001 is installed on the precast foundation 002, the grout outlet end of the grouting equipment is connected to the grouting hole located at the bottom of the steel bar sleeve through the grouting pipe 1 with grouting channel.

[0049] S2. Start the grouting equipment to grout inside the steel sleeve 001;

[0050] S3. After grouting is completed, seal the vent 003 at the top of the rebar sleeve 001 and close the outlet 22 of the grouting pipe 1; so as to stabilize the pressure inside the rebar sleeve 001 and prevent the impact of subsequent pipe pulling pressure fluctuations on the internal pressure.

[0051] S4. Continue grouting the pressure holding chamber 11 until the pressure stabilizing component 13 is located in the predetermined position in the grout storage channel. The pressure inside the pressure holding chamber 11 is indicated by the pressure mark 14. In this state, the pressure inside the pressure holding chamber 11 indicated by the pressure stabilizing component 13 is generally greater than the specified grout pressure in the steel sleeve 001, so as to provide pre-pressure for the grout in the steel sleeve 001.

[0052] S5. Shut down the grouting equipment and close the inlet 21 of the grouting pipe 1;

[0053] S6. Open the outlet 22 of the grouting pipe 1 to connect the grouting channel with the steel sleeve 001, and apply prestress to the pressure stabilizer 13; if the grouting is not full or there is leakage, the prestress will fill the grout in the grouting pipe 1 into the steel sleeve, thereby enhancing the reliability and effectiveness of grouting and overcoming the defect of insufficient grouting material in the steel sleeve grouting.

[0054] S7, monitor the pressure mark 14 indicated by the voltage regulator 13;

[0055] If the indicated pressure value drops to the preset warning value, repeat steps S2 to S6 to fill the steel sleeve with grout.

[0056] S8. After the concrete has cured, remove the connection joint used for grouting the steel reinforcement sleeve.

[0057] This solution allows direct measurement of the grout pressure within the grouting sleeve of the PC component via the pressure value indicated by the pressure stabilizer 13. This enables the determination of the grout saturation within the steel reinforcement sleeve, transforming the qualitative analysis of grout saturation into a quantitative one, thereby ensuring construction quality. Furthermore, if the grouting is incomplete or not dense, an automatic compensation mechanism can promptly replenish the grout within the sleeve. In particular, if the pressure falls below the warning value, external grouting can be proactively replenished to prevent the aforementioned defects. This solution saves grout, is simple to construct, and is more environmentally friendly.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A connection joint for grouting reinforcing bar sleeves, characterized in that: It includes a grouting pipe with a grouting channel and a pressure-holding pipe with a grout storage channel; the grouting channel has an inlet for connecting to the grout outlet end of the grouting equipment and an outlet for connecting to the grouting hole of the reinforcing bar sleeve, the inlet being controlled to open and close, and the outlet being controlled to open and close. The slurry storage channel has a pressure-holding chamber whose volume is controlled to increase or decrease. The pressure-holding chamber is connected to the grouting channel and is subjected to prestress that relatively reduces its volume.

2. The connection joint for grouting reinforcing bar sleeves according to claim 1, characterized in that: The grouting pipe is equipped with a rubber plug at the outlet of the grouting hole of the reinforcing bar sleeve. The rubber plug has a built-in channel connecting the grouting hole of the reinforcing bar sleeve and the outlet. The rubber plug is sleeved on the end of the grouting pipe and is tapered with a smaller front end and a larger rear end.

3. The connection joint for grouting reinforcing bar sleeves according to claim 2, characterized in that: The slurry storage channel is equipped with a pressure stabilizing component that divides the slurry storage channel into a pressure-holding chamber and a power chamber. The pressure stabilizing component is driven to move within the slurry storage channel so that the volume of the pressure-holding chamber can be controlled to increase or decrease.

4. The connection joint for grouting of reinforcing bar sleeves according to claim 3, characterized in that: The pressure stabilizing component and the slurry storage channel are equipped with a seal to seal and separate the pressure holding chamber and the power chamber.

5. The connection joint for grouting of reinforcing bar sleeves according to claim 3, characterized in that: Along the movement path of the pressure stabilizer within the slurry storage channel, the pressure-maintaining pipe is equipped with an observation window for monitoring the position of the pressure stabilizer within the slurry storage channel.

6. The connection joint for grouting of reinforcing bar sleeves according to claim 5, characterized in that: Along the movement path of the pressure stabilizer within the slurry storage channel, the observation window has pressure markings for indicating the pressure inside the pressure chamber.

7. The connection joint for grouting reinforcing bar sleeves according to claim 6, characterized in that: The slurry storage channel is a straight channel. The pressure stabilizing component is built into the slurry storage channel, dividing the slurry storage channel into a pressure-holding chamber and a power chamber. The power chamber is equipped with an elastic component that applies prestress to the pressure stabilizing component.

8. The connection joint for grouting of reinforcing bar sleeves according to claim 7, characterized in that: The slurry storage channel has an end cap at the end of the power compartment, and the elastic element is limited between the pressure stabilizing element and the end cap.

9. The connection joint for grouting of reinforcing bar sleeves according to claim 8, characterized in that: The end cap has a balance hole.

10. The connection joint for grouting of reinforcing bar sleeves according to claim 1, characterized in that: A blocking part is provided at the interface position between the pressure-holding chamber and the grouting channel.

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