Grouting system for post-tensioning of concrete beams

Abstract

This invention provides a grouting system for post-tensioning of prestressed concrete beams, solving the problem of local voids easily occurring after grouting of prestressing ducts. The invention includes a concrete structure with pre-set, left-right perforated prestressing ducts. Anchor plates are installed at both ends of the prestressing ducts, with a grouting hole at the center of each anchor plate. The left anchor plate is sealed and fixedly connected to one end of a grouting pipe, which is equipped with a first electronic flow meter and a first valve. The other end of the grouting pipe is connected to the outlet of a concrete pump. Several pressure sensors are equidistantly spaced along the length of the prestressing duct. The right anchor plate is fixedly connected to one end of a grout discharge pipe, which is equipped with a second electronic flow meter and a second valve. The first and second electronic flow meters and pressure sensors are all communicatively connected to a controller, which has a display screen and is connected to the concrete pump control system.

Description

Technical Field

[0001] This utility model relates to the field of concrete grouting construction technology, and in particular to a grouting system for post-tensioning of prestressed concrete beams. Background Technology

[0002] In the engineering application of post-tensioned prestressed concrete structures, grouting of prestressing ducts prevents corrosion of prestressing tendons, fills the gaps between the prestressing tendons and the ducts, and forms a unified whole between the prestressing tendons and concrete, ensuring the durability of the structure during use. However, during manual grouting, due to inaccurate control of grouting pressure and poor air venting in the ducts, local voids can easily occur within the prestressing ducts, resulting in incomplete grouting and affecting structural performance. Utility Model Content

[0003] To address the problem of local voids that easily occur after grouting of prestressed ducts in the prior art, this utility model proposes a grouting system for post-tensioning of prestressed concrete beams.

[0004] The technical solution of this utility model is: a grouting system for post-tensioning of prestressed concrete beams, including a concrete structure, the interior of which is pre-set with left and right through prestressing ducts, and anchor plates are provided at both ends of the prestressing ducts. Tensioning bars are tensioned and fixed between the two anchor plates. A grouting hole with left and right through is provided at the center of the anchor plate. The left anchor plate is sealed and fixedly connected to one end of the grouting pipe. The grouting pipe is connected to the grouting hole. A first electronic flow meter and a first valve are provided on the grouting pipe. The other end of the grouting pipe is connected to the outlet of a concrete pump. The inlet of the concrete pump is connected to the grout storage device pipeline.

[0005] Several pressure sensors are arranged at equal intervals along the length of the prestressed duct.

[0006] The anchor plate on the right side is fixedly connected to one end of the grout discharge pipe, and the grout discharge pipe is connected to the grouting hole. The grout discharge pipe is equipped with a second electronic flow meter and a second valve.

[0007] The first electronic flow meter, the second electronic flow meter, and the pressure sensor are all connected to the controller. The controller is equipped with a display screen and is connected to the concrete pump control system.

[0008] Preferably, a rope passing through a prestressed duct is fixedly connected between the left and right anchor plates. The rope is in a tensioned state, and the pressure sensor is fixedly tied to the rope.

[0009] Preferably, the grouting holes of the anchor plate protrude inward locally near the prestressing ducts to form an annular retaining ring;

[0010] The grouting hole is equipped with a detachable annular stop, which abuts against the side of the retaining ring away from the prestressed duct.

[0011] The annular stop includes an inner ring and an outer ring arranged coaxially, and a connecting rod is fixedly connected between the inner ring and the outer ring. The inner ring, the outer ring and the connecting rod form a through hole structure that communicates with the grouting hole.

[0012] The end of the rope is fixed inside the inner ring by anchoring clips.

[0013] Preferably, a first branch pipe is connected to the grouting pipe, and the connection node between the first branch pipe and the grouting pipe is located between the first electronic flow meter and the anchor plate on the left.

[0014] The first branch pipe is equipped with a third valve, and the end of the first branch pipe away from the grouting pipe is connected to the water supply device.

[0015] Preferably, a second branch pipe is connected to the first branch pipe, a fourth valve is provided on the second branch pipe, the end of the second branch pipe away from the first branch pipe is connected to the air supply device, and the second branch pipe is located between the third valve and the grouting pipe.

[0016] Preferably, a third branch pipe is provided on the first branch pipe, and a fifth valve is provided on the third branch pipe. The third branch pipe is located between the second branch pipe and the grouting pipe.

[0017] An electronic pressure gauge is installed on the first branch pipe. The electronic pressure gauge is connected to the controller and is located between the third branch pipe and the grouting pipe.

[0018] A seventh valve is installed on the first branch pipe between the electronic pressure gauge and the grouting pipe.

[0019] Preferably, a fourth branch pipe is connected to the slurry discharge pipe. The fourth branch pipe is located between the second valve and the anchor plate on the right side, and a seventh valve is provided on the fourth branch pipe.

[0020] Preferably, the end of the slurry discharge pipe is provided with a first collection trough, and the end of the fourth branch pipe is provided with a second collection trough.

[0021] Preferably, the first valve, second valve, third valve, fourth valve, fifth valve, sixth valve, and seventh valve are all solenoid valves and are connected to the controller for control.

[0022] The advantages of this utility model are as follows: During grouting, the controller automatically detects whether the flow difference between the second and first electronic flow meters is within the preset range of concrete flow difference, and detects whether the pressure in the prestressed duct meets the preset pressure value in the controller through pressure sensors at various nodes. If it is less than the preset range of concrete flow difference and pressure value, the second valve is automatically closed, and the concrete pump pressurizes and pumps into the prestressed duct to achieve precise control of grouting pressure and avoid local voids in the prestressed duct caused by insufficient grouting. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the main structure of Example 1;

[0025] Figure 2 for Figure 1 Enlarged view of the structure at point A in the image;

[0026] Figure 3 for Figure 2 A schematic diagram of the structure of the annular stop in the middle from the left viewing angle;

[0027] In the diagram, 1. Concrete structure, 2. Prestressed duct, 3. Anchor plate, 281. Retaining ring, 4. Grouting pipe, 5. First electronic flow meter, 6. First valve, 7. Concrete pump, 8. Grout storage tank, 9. Mixing device, 10. Grout discharge pipe, 11. Second electronic flow meter, 12. Second valve, 13. First collection tank, 14. First branch pipe, 15. Water supply device, 16. Third valve, 17. Air supply device, 18. Fourth valve, 19. Fifth valve, 20. Electronic pressure gauge, 21. Annular retaining element, 2101. Inner ring, 2102. Outer ring, 2103. Connecting rod, 22. Rope, 23. Pressure sensor, 24. Anchoring clamp, 25. Sixth valve, 26. Second collection tank, 27. Tensioning bar, 28. Seventh valve. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1: Grouting system for post-tensioning of prestressed concrete beams, such as Figure 1As shown, the structure includes a concrete structure 1, which has pre-set prestressed ducts 2 that are open to both sides. Anchor plates 3 are installed at both ends of the prestressed ducts 2, and tension bars 27 are tensioned and fixed between the two anchor plates 3. A grouting hole with open sides is located at the center of the anchor plate 3. The left anchor plate 3 is sealed and fixedly connected to one end of a grouting pipe 4, which communicates with the grouting hole. A first electronic flow meter 5 and a first valve 6 are installed on the grouting pipe 4. The other end of the grouting pipe 4 is connected to the outlet of a concrete pump 7, and the inlet of the concrete pump 7 is connected to a grout storage device pipeline. The grout storage device can be a combination of a grout storage tank 8 and a mixing device 9, or it can be supplied by a concrete mixer truck.

[0030] A rope 22, threaded within a prestressed duct 2, is fixedly connected between the two anchor plates 3 on the left and right sides. The rope 22 is under tension, and several pressure sensors 23, evenly spaced, are fixed to the rope 22. Specifically, as shown... Figure 2 As shown, the grouting holes of the anchor plate 3 near the prestressed duct 2 protrude inward to form an annular retaining ring 301. Figure 3 As shown, a detachable annular stop 21 is provided in the grouting hole. The annular stop 21 abuts against the side of the retaining ring 301 away from the prestressed duct 2. The annular stop 21 includes an inner ring 2101 and an outer ring 2102 arranged coaxially. A connecting rod 2103 is fixedly connected between the inner ring 2101 and the outer ring 2102. A through hole structure communicating with the grouting hole is formed between the inner ring 2101, the outer ring 2102 and the connecting rod 2103. The end of the rope 22 is fixed in the inner ring 2101 by an anchoring clip 24.

[0031] The anchor plate 3 on the right side is fixedly connected to one end of the grout discharge pipe 10, and the grout discharge pipe 10 is connected to the grouting hole. The grout discharge pipe 10 is equipped with a second electronic flow meter 11 and a second valve 12. The first electronic flow meter 5, the second electronic flow meter 11, and the pressure sensor 23 are all connected to the controller. The controller is equipped with a display screen and is connected to the concrete pump 7 for control.

[0032] To enable water washing of the prestressed duct 2 and remove debris, in this embodiment, a first branch pipe 14 is connected to the grouting pipe 4. The connection point between the first branch pipe 14 and the grouting pipe 4 is located between the first electronic flow meter 5 and the anchor plate 3 on the left. A third valve 16 is provided on the first branch pipe 14, and the end of the first branch pipe 14 away from the grouting pipe 4 is connected to a water supply device 15. The water supply device 15 can be a water storage tank and a water pump, or it can be a municipal water pipe and a booster pump, so that the water entering the first branch pipe 14 is high-pressure water, improving the cleaning effect.

[0033] To enable high-pressure gas purging of the prestressed duct 2, a second branch pipe is connected to the first branch pipe 14. The second branch pipe is equipped with a fourth valve 18. The end of the second branch pipe away from the first branch pipe 14 is connected to the air supply device 17. The second branch pipe is located between the third valve 16 and the grouting pipe 4. In this embodiment, the air supply device 17 is an air compressor.

[0034] In order to further improve the grout density by using air pressure during grouting, in this embodiment, a third branch pipe is provided on the first branch pipe 14, and a fifth valve 19 is provided on the third branch pipe. The third branch pipe is located between the second branch pipe and the grouting pipe 4. An electronic pressure gauge 20 is provided on the first branch pipe 14, and the electronic pressure gauge 20 is communicatively connected to the controller. The electronic pressure gauge 20 is located between the third branch pipe and the grouting pipe 4. A seventh valve 28 is provided on the first branch pipe 14 between the electronic pressure gauge 20 and the grouting pipe 4.

[0035] In order to collect excess concrete slurry and water separately, such as Figure 1 As shown, a fourth branch pipe is connected to the slurry discharge pipe 10. The fourth branch pipe is located between the second valve 12 and the anchor plate 3 on the right side, and a seventh valve 28 is provided on the fourth branch pipe. A first collection trough 13 is provided at the end of the slurry discharge pipe 10, and a second collection trough 26 is provided at the end of the fourth branch pipe.

[0036] To facilitate automatic control of the entire system via a controller, in this embodiment, the first valve 6, the second valve 12, the third valve 16, the fourth valve 18, the fifth valve 19, the sixth valve 25, and the seventh valve 28 are all solenoid valves and are connected to the controller for control.

[0037] Working principle: Before grouting, the third valve 16, the seventh valve 28, and the sixth valve 25 are opened, the remaining valves are closed, the water supply device 15 is turned on, and high-pressure water is injected into the prestressed duct 2 to perform high-pressure cleaning of the prestressed duct 2. The wastewater after cleaning flows into the second collection tank 26 and is collected.

[0038] After the water washing is completed, turn off the water supply device 15, open the fourth valve 18, the seventh valve 28, and the sixth valve 25, close the remaining valves, and turn on the air supply device 17. The air supply device 17 injects high-pressure air into the prestressed duct 2 to clean the debris and water remaining in the prestressed duct 2. After cleaning, turn off the water supply device 15, the fourth valve 18, the seventh valve 28, and the sixth valve 25.

[0039] During grouting, the rope 27 with pressure sensor 23 attached is first tensioned and fixed in the prestressed duct 2 through anchoring clip 24 and annular stop 21.

[0040] Then, open the first valve 6 and the second valve 12, close the remaining valves, start the concrete pump 7, and pump the concrete slurry into the prestressed duct 2. After the concrete slurry flows through the second electronic flow meter 11, the controller automatically detects whether the flow difference between the second electronic flow meter 11 and the first electronic flow meter 5 is within the preset flow difference range of the concrete, and detects whether the pressure in the prestressed duct 2 meets the preset pressure value in the controller through the pressure sensors 23 at each node.

[0041] If the pressure is less than the preset difference range of the concrete flow rate and the preset pressure value, first close the first valve 6, the second valve 12, and the concrete pump 7, and open the air supply device 17, the fourth valve 18, and the seventh valve 28 to pressurize the air into the prestressed duct 2 to the preset pressure stabilization value in the controller. Stabilize the pressure for a period of time, close the air supply device 17 during the pressure stabilization, and monitor the pressure value and pressure change in real time through the electronic pressure gauge 20. If the pressure suddenly decreases, pressurize again through the air supply device 17 to the preset pressure stabilization value until the pressure stabilizes for a certain period of time without change. Then close the fourth valve 18, open the fifth valve 19 to release the pressure, and monitor the pressure in the pipeline in real time through the electronic pressure gauge 20 until the pressure in the electronic pressure gauge 20 equals atmospheric pressure and the pressure values ​​detected by the pressure sensors 23 at all points tend to be consistent. Then close the fifth valve 19.

[0042] Reopen the first valve 6, start the concrete pump 7, and pump the concrete slurry into the prestressed duct 2 again until the pressure in each prestressed duct 2 meets the preset pressure value in the controller. Then close the first valve 6 and the concrete pump 7, and the grouting is completed.

[0043] Example 2: Grouting system for post-tensioning of prestressed concrete beams. This example differs from Example 1 in that the rope 22, annular stop 21, and anchoring clamp 24 are no longer installed. The pressure sensor 23 is pre-fixed to the inner wall of the prestressing duct 2. Other structures are the same as in Example 1.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A grouting system for post-tensioning of a concrete beam, comprising a concrete structure (1), a left-right through prestressed duct (2) being pre-set in the concrete structure (1), an anchoring plate (3) being arranged at each of the left and right ports of the prestressed duct (2), and a tensioning tendon (27) being fixedly tensioned between the two anchoring plates (3), characterized in that: The anchor plate (3) has a grouting hole that is open to the left and right at the center. The anchor plate (3) on the left side is sealed and fixed to one end of the grouting pipe (4). The grouting pipe (4) is connected to the grouting hole. The grouting pipe (4) is equipped with a first electronic flow meter (5) and a first valve (6). The other end of the grouting pipe (4) is connected to the outlet of the concrete pump (7). The inlet of the concrete pump (7) is connected to the grout storage device pipeline. Several pressure sensors (23) are provided at equal intervals along the length of the prestressed duct (2); The anchor plate (3) on the right side is fixedly connected to one end of the grout discharge pipe (10), and the grout discharge pipe (10) is connected to the grouting hole. The grout discharge pipe (10) is equipped with a second electronic flow meter (11) and a second valve (12). The first electronic flow meter (5), the second electronic flow meter (11), and the pressure sensor (23) are all connected to the controller. The controller is equipped with a display screen and is connected to the concrete pump (7) for control.

2. The grouting system for post-tensioning of prestressed concrete beams as described in claim 1, characterized in that: A rope (22) is fixedly connected between the two anchor plates (3) on the left and right sides and passes through the prestressed duct (2). The rope (22) is in a tensioned state, and the pressure sensor (23) is fixedly tied to the rope (22).

3. The grouting system for post-tensioning of prestressed concrete beams as described in claim 2, characterized in that: The grouting hole of the anchor plate (3) near the prestressed duct (2) protrudes inward to form an annular retaining ring (301); A detachable annular stop (21) is provided inside the grouting hole, and the annular stop (21) abuts against the side of the retaining ring (301) away from the prestressed duct (2); The annular stop (21) includes an inner ring (2101) and an outer ring (2102) arranged coaxially. A connecting rod (2103) is fixedly connected between the inner ring (2101) and the outer ring (2102). A through hole structure communicating with the grouting hole is formed between the inner ring (2101), the outer ring (2102) and the connecting rod (2103). The end of the rope (22) is fixed in the inner ring (2101) by the anchoring clip (24).

4. The grouting system for post-tensioning of prestressed concrete beams as described in claim 1, characterized in that: The grouting pipe (4) is connected to a first branch pipe (14), and the connection node between the first branch pipe (14) and the grouting pipe (4) is located between the first electronic flow meter (5) and the anchor plate (3) on the left. The first branch pipe (14) is equipped with a third valve (16), and the end of the first branch pipe (14) away from the grouting pipe (4) is connected to the water supply device (15).

5. The grouting system for post-tensioning of prestressed concrete beams as described in claim 4, characterized in that: The first branch pipe (14) is connected to the second branch pipe, and the second branch pipe is equipped with the fourth valve (18). The end of the second branch pipe away from the first branch pipe (14) is connected to the air supply device (17). The second branch pipe is located between the third valve (16) and the grouting pipe (4).

6. The grouting system for post-tensioning of prestressed concrete beams as described in claim 5, characterized in that: The first branch pipe (14) is provided with a third branch pipe, and the third branch pipe is provided with a fifth valve (19). The third branch pipe is located between the second branch pipe and the grouting pipe (4). An electronic pressure gauge (20) is installed on the first branch pipe (14). The electronic pressure gauge (20) is connected to the controller and is located between the third branch pipe and the grouting pipe (4). A seventh valve (28) is provided on the first branch pipe (14) between the electronic pressure gauge (20) and the grouting pipe (4).

7. The grouting system for post-tensioning of prestressed concrete beams as described in claim 6, characterized in that: A fourth branch pipe is connected to the slurry discharge pipe (10). The fourth branch pipe is located between the second valve (12) and the anchor plate (3) on the right side. A seventh valve (28) is provided on the fourth branch pipe.

8. The grouting system for post-tensioning of prestressed concrete beams as described in claim 7, characterized in that: The end of the slurry discharge pipe (10) is provided with a first collection trough (13), and the end of the fourth branch pipe is provided with a second collection trough (26).

9. The grouting system for post-tensioning of prestressed concrete beams as described in claim 7 or 8, characterized in that: The first valve (6), the second valve (12), the third valve (16), the fourth valve (18), the fifth valve (19), the sixth valve (25), the seventh valve (28), and the seventh valve (28) are all solenoid valves and are connected to the controller.

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