Method for testing impact damage rate of repaired area of release structure

Abstract

The invention discloses a method for testing the impact damage rate of a repaired area of a release structure, and the method specifically comprises the steps: repairing the to-be-repaired area of the release structure, installing a flow velocity measuring instrument, opening a gate for water drainage, and obtaining the average water flow impact speed v under the water flow impact time t and the sunken volume V2 of the to-be-repaired area, establishing a relation curve between the water flow impact time t and the recess volume V2; preparing a plurality of repairing mortar-concrete test blocks, and dividing the repairing mortar-concrete test blocks into two groups; performing a falling ball impact test on one group of repairing mortar-concrete test blocks by adopting a falling ball impact test device, measuring the compressive strength of the other group of repairing mortar-concrete test blocks, calculating the average value f of the compressive strength of the group, calculating the impact damage rate a, and establishing a relation curve between the impact damage rate a and the recess volume V1; and obtaining the impact damage rate a and the water flow impact time t when the recess volume V1 is equal to the recess volume V2, and calculating the impact damage rate b. The impact damage rate tested by the method is accurate in result and easy to operate.

Description

Technical Field

[0001] The present invention belongs to the technical field of water conservancy engineering, and particularly relates to a method for testing the impact damage rate in the repair area of a water discharge structure. Background Art

[0002] In the field of water conservancy engineering, the safety and stability of water discharge structures are of crucial importance. These structures are exposed to complex and variable water flow environments for a long time, and their surface and internal structures are easily subjected to physical effects such as water flow scouring and erosion, resulting in performance degradation or even structural damage. In order to maintain the normal operation of water discharge structures, timely and effective repair work is particularly important.

[0003] During the repair process, the performance evaluation of repair materials is one of the key links. Traditional performance evaluation methods mainly rely on simulation tests under laboratory conditions, and key indicators such as the impact damage rate of repair materials are tested by simulating specific environmental conditions. However, these methods often have difficulty in fully simulating the complex impact conditions under actual water flow environments, resulting in certain differences between the test results and the actual application situations. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for testing the impact damage rate in the repair area of a water discharge structure, which solves the problem of low accuracy of test results of existing methods.

[0005] The technical solution adopted by the present invention is a method for testing the impact damage rate in the repair area of a water discharge structure, and the specific steps are as follows: Step 1, repair the area to be repaired of the water discharge structure and install a flow velocity measuring instrument, open the sluice to discharge water, and obtain the average water flow impact velocity t under the water flow impact time v and the depression volume V2 of the area to be repaired, and establish a relationship curve between the water flow impact time t and the depression volume V2; Step 2, prepare several repair mortar-concrete test blocks and divide them into two groups; Step 3, conduct a drop ball impact test on a group of repair mortar-concrete test blocks using a drop ball impact test device, measure the compressive strength of the other group of repair mortar-concrete test blocks and calculate the average value of the compressive strength of this group f and calculate the impact damage rate a and establish the impact damage rate a and the relationship curve with the depression volume V1; Step 4, obtain the impact damage rate a when the depression volume V1 is equal to the depression volume V2 and the water flow impact time t, and calculate the impact damage rate b .

[0006] The characteristics of the present invention also lie in that In Step 1, obtain the water flow impact time. t The process of obtaining the depression volume V2 of the area to be repaired under the following conditions is as follows: When the set water flow impact time t is reached, close the sluice gate. After there is no water impacting the area to be repaired, use a 3D scanner to scan the area to be repaired to obtain a 3D model of the area to be repaired. Calculate the depression volume V2 of the area to be repaired based on the shape and size of the depression in the 3D model. After the scanning is completed, open the sluice gate to drain the water for measuring the depression volume V2 of the area to be repaired under different water flow impact times t.

[0007] The process of preparing a single repair mortar-concrete test block in Step 1 is as follows: Apply lubricating oil on the side walls and bottom plate of the mold. Then pour the concrete slurry into the mold until it reaches half of the mold volume and stop. Cover the top of the concrete slurry with a middle plate. After the concrete slurry starts to set, remove the middle plate. After roughening the top of the concrete, pour mortar on the top of the concrete until the mold overflows. After the pouring is completed, put the whole into a standard curing room for curing until the age and then demold. The demolded test block is then put into the standard curing room for curing to obtain the repair mortar-concrete test block.

[0008] The volume of each repair mortar-concrete test block is 100mm×100mm×100mm, the volume of the mortar part is 100mm×100mm×50mm, and the volume of the concrete part is 100mm×100mm×50mm.

[0009] The mold includes a square bottom plate, and side plates are connected to the four sides of the square bottom plate, and adjacent side plates are connected to each other.

[0010] In Step 3, the ball-drop impact test device includes a base, a specimen holder is arranged on the base, one end of the base is connected with a telescopic support, the top of the telescopic support is connected with one end of an L-shaped cross beam, the other end of the L-shaped cross beam is inserted into a spool, a rope is wound around the spool, one end of the rope is connected with the spool, the other end of the rope is connected with a steel ball, the steel ball corresponds to the position of the specimen holder, a hand crank is arranged on the side wall of the spool away from the L-shaped cross beam, an L-shaped safety lock is rotatably connected to the L-shaped cross beam through a pin shaft, a stop block is arranged at one end of the pin shaft away from the L-shaped cross beam, and a plurality of small cross beams are arranged on the side wall of the spool close to the L-shaped cross beam along its circumferential direction, and the safety lock cooperates with the small cross beams.

[0011] The specific process of Step 3 is as follows: Step 3.1, conduct a ball-drop impact test on one group of repair mortar-concrete test blocks; The specific process is as follows: Put the repair mortar-concrete test block into the specimen holder, rotate the hand crank to drive the spool to rotate and wind the rope onto the spool to adjust the falling height of the steel ball. When the falling height makes the speed of the steel ball reaching the surface of the repair mortar-concrete test block the same as the average water flow impact speed obtained in Step 1 vWhen they are equal, stop turning the hand crank, engage the safety lock with the small crossbeam to fix the position of the spool. When conducting the formal test, open the safety lock, and the steel ball drives the spool to rotate and release the rope, then the steel ball falls onto the upper surface of the repaired mortar-concrete specimen, impacting the repaired mortar-concrete specimen. After the impact, use the sand filling method to measure the sunken volume V1 of the surface of the repaired mortar-concrete specimen 4; Step 3.2, repeat Step 3.1, conduct multiple impacts on the surface of the repaired mortar-concrete specimen 4 until the sunken volume V1 of the surface reaches the preset value and then stop the impact; Step 3.3, after the impact, measure the compressive strength of the impacted repaired mortar-concrete specimen through a compressive strength test f 0 ; Step 3.4, measure the compressive strength of another group of repaired mortar-concrete specimens through a compressive strength test and calculate the average value of the compressive strength of this group f ; Step 3.5 According to the compressive strength obtained in Step 3.3 f 0 and the average value of the compressive strength obtained in Step 3.4 f , calculate the impact damage rate a ; Step 3.6, according to the impact damage rate obtained in Step 3.5 a and the sunken volume V1, establish the relationship curve between the impact damage rate a and the sunken volume V1.

[0012] In Step 3.5, the expression of the impact damage rate a is: .

[0013] In Step 4, the expression of the impact damage rate b is: .

[0014] The beneficial effects of the present invention are: (1) The test method for the impact damage rate in the repair area of the water discharge structure of the present invention tests the sunken volume of the specimen through the falling ball impact test device, establishes the relationship curve between the impact damage rate a and the sunken volume V1, is easy to operate, can complete the test quickly in the laboratory, and greatly improves the test effect; (2) The test method for the impact damage rate in the repair area of the water discharge structure of the present invention, through the impact damage rate aThe relationship curve between the impact damage rate and the depression volume V1, and the relationship curve between the water flow impact time t and the depression volume V2 are used to obtain the impact damage rate, which can intuitively obtain the test results with high accuracy and strong operability, and can quickly obtain the impact damage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the repaired mortar-concrete specimen in the method of the present invention; Figure 2 It is a schematic structural diagram of the mold in the method of the present invention; Figure 3 It is a schematic structural diagram of the drop ball impact test device in the method of the present invention; Figure 4 It is a schematic structural diagram of the spool in the method of the present invention; Figure 5 It is the relationship curve between the water flow impact time t and the depression volume V2 in Example 6 of the present invention; Figure 6 It is the impact damage rate in Example 6 of the present invention a The relationship curve with the depression volume V1.

[0016] In the figure, 1. Mortar part, 2. Concrete part, 3. Specimen fixator, 4. Repaired mortar-concrete test block, 5. Telescopic support, 6. Steel ball, 7. Hand crank, 8. Safety lock, 9. Bottom plate, 10. Side plate, 11. Middle plate, 12. Rope, 13. Base, 14. L-shaped cross beam, 15. Spool, 16. Pin shaft, 17. Stopper, 18. Small cross beam. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0018] Example 1 The method for testing the impact damage rate of the repaired area of the water discharge structure of the present invention specifically comprises the following steps: Step 1, repair the area to be repaired of the water discharge structure and install a flow velocity measuring instrument, open the sluice to discharge water, and the flow velocity measuring instrument collects the water flow impact velocity in real time to obtain the water flow impact time t The average water flow impact velocity v and the depression volume V2 of the area to be repaired, and establish the relationship curve between the water flow impact time t and the depression volume V2; Step 2, prepare several repaired mortar-concrete test blocks 4 and divide them into two groups; Step 3, perform a drop ball impact test on a group of repaired mortar-concrete test blocks 4 using a drop ball impact test device, measure the compressive strength of the other group of repaired mortar-concrete test blocks 4 and calculate the average value of the compressive strength of this group f , calculate the impact damage ratea and establish the relationship curve between the impact damage rate a and the dent volume V1; Step 4, obtain the impact damage rate when the dent volume V1 is equal to the dent volume V2 a and the water flow impact time t, and calculate the impact damage rate b ; The impact damage rate b is expressed as: .

[0019] Example 2 Based on Example 1, in Step 1, the process of obtaining the dent volume V2 of the area to be repaired at the water flow impact time t is as follows: When the set water flow impact time t is reached, close the gate. After there is no water impact on the area to be repaired, use a 3D scanner to scan the area to be repaired to obtain a 3D model of the area to be repaired. Calculate the dent volume V2 of the area to be repaired according to the shape and size of the dent in the 3D model. After the scanning is completed, open the gate to drain the water for measuring the dent volume V2 of the area to be repaired at different water flow impact times t.

[0020] Among them, the model of the 3D scanner is Trimble TX8, which performs excellently in terms of measurement speed, range, and measurement accuracy, and can provide high-quality data results for the measurement of the dam dent; it is based on laser ranging and angle measurement, and generates the 3D coordinates of the target object through precise calculation, and finally can form a detailed 3D model.

[0021] Calculating the dent volume V2 through the 3D model is an existing technology in this field.

[0022] Example 3 Based on Example 2, in Step 2, the process of preparing a single repair mortar-concrete test block 4 is as follows: Apply lubricating oil on the side wall and bottom plate of the mold, then pour the concrete slurry into the mold until it reaches half of the mold volume and stop. Cover the middle plate 11 on the top of the concrete slurry. After the concrete slurry starts to set, remove the middle plate 11. After roughening the top of the concrete, pour mortar on the top of the concrete until the mold overflows. After the pouring is completed, put the whole into the standard curing room for curing until the age, then demold, and then put the demolded test block into the standard curing room for curing to obtain the repair mortar-concrete test block 4.

[0023] Among them, the temperature of the standard curing room is 20±3°C, and the relative humidity is not less than 90%; Such as Figure 1As shown, the volume of each repair mortar-concrete specimen 4 is 100 mm × 100 mm × 100 mm. Each repair mortar-concrete specimen 4 successively includes a concrete part 2 and a mortar part 1 from bottom to top. The volume of the mortar part 1 is 100 mm × 100 mm × 50 mm, and the volume of the concrete part 2 is 100 mm × 100 mm × 50 mm.

[0024] As Figure 2 shown, the mold includes a square bottom plate 9, and side plates 10 are connected to the four sides of the square bottom plate 9. Adjacent side plates 10 are connected to each other.

[0025] Example 4 Based on Example 3, in step 3, as Figure 3 and Figure 4 shown, the drop-weight impact test device includes a base 13. A specimen holder 3 is arranged on the base 13. One end of the base 13 is connected with a telescopic bracket 5. The top of the telescopic bracket 5 is connected with one end of an L-shaped cross beam 14. The other end of the L-shaped cross beam 14 is inserted into a spool 15. A rope 12 is wound around the spool 15. One end of the rope 12 is connected with the spool 15, and the other end of the rope 12 is connected with a steel ball 6. The steel ball 6 corresponds to the position of the specimen holder 3. A hand crank 7 is arranged on the side wall of the spool 15 away from the L-shaped cross beam 14. An L-shaped safety lock 8 is rotatably connected to the L-shaped cross beam 14 through a pin shaft 16 (that is, the side wall of the L-shaped cross beam 14 is connected with one end of the pin shaft 16, and the L-shaped safety lock 8 is rotatably connected to the pin shaft 16). A stop block 17 is arranged at one end of the pin shaft 16 away from the L-shaped cross beam 14. A plurality of small cross beams 18 are arranged on the side wall of the spool 15 close to the L-shaped cross beam 14 and along its circumferential direction. The safety lock 8 cooperates with the small cross beams 18.

[0026] Example 5 Based on Example 4, the specific process of step 3 is as follows: Step 3.1, conduct a drop-weight impact test on one group of repair mortar-concrete specimens 4; The specific process is as follows: Place the repair mortar-concrete specimen 4 into the specimen holder 3, rotate the hand crank 7 to drive the spool 15 to rotate and wind the rope 12 onto the spool 15 to adjust the falling height of the steel ball 6. When the falling height makes the speed of the steel ball 6 reaching the surface of the repair mortar-concrete specimen 4 equal to v the average water flow impact speed obtained in step 1, stop rotating the hand crank 7, engage the safety lock 8 with the small cross beams 18 to fix the position of the spool 15. When conducting the formal test, open the safety lock 8, and the steel ball 6 drives the spool 15 to rotate and release the rope 12, then the steel ball 6 falls onto the upper surface of the repair mortar-concrete specimen 4 to impact the repair mortar-concrete specimen 4. After the impact, use the sand filling method to measure the depression volume V1 of the surface of the repair mortar-concrete specimen 4; Step 3.2: Repeat Step 3.1 to impact the surface of the repaired mortar-concrete specimen 4 multiple times until the surface depression volume V1 reaches the preset value, then stop the impact; Step 3.3: After the impact is completed, measure the compressive strength of the impacted repaired mortar-concrete specimen 4 through a compressive strength test f 0 ; Step 3.4: Measure the compressive strength of another group of repaired mortar-concrete specimens 4 through a compressive strength test and calculate the average value of the compressive strength of this group f ; Step 3.5: According to the compressive strength obtained in Step 3.3 f 0 and the average value of the compressive strength obtained in Step 3.4 f , calculate the impact damage rate a ; ; Step 3.5: According to the impact damage rate obtained in Step 3.5 a and the depression volume V1, establish a relationship curve between the impact damage rate a and the depression volume V1.

[0027] Example 6 The method for testing the impact damage rate in the repaired area of the water discharge structure of the present invention is specifically as follows: Step 1: Repair the area to be repaired of the water discharge structure and install a flow velocity measuring instrument. Open the sluice to discharge water, and the flow velocity measuring instrument collects the water flow impact velocity in real time and calculates the average water flow impact velocity t under the water flow impact time v . In this example, the average water flow impact velocity v is 10 m / s, and measure the depression volume V2 of the area to be repaired under different water flow impact times t (as shown in Table 1), and establish a relationship curve between the water flow impact time t and the depression volume V2 as Figure 5 shown; The process of measuring the depression volume V2 of the area to be repaired under the water flow impact time t is as follows: When the set water flow impact time t is reached, close the sluice gate. After there is no water impact on the area to be repaired, use a 3D scanner to scan the area to be repaired to obtain a 3D model of the area to be repaired, and calculate the depression volume V2 of the area to be repaired according to the shape and size of the depression in the 3D model. After the scanning is completed, open the sluice gate to discharge water to measure the depression volume V2 of the area to be repaired under different water flow impact times t, that is, the sluice gate needs to be closed each time the depression volume V2 of the area to be repaired is measured; Table 1

[0028] Step 2: Prepare several repair mortar-concrete specimens 4 and divide them into two groups. The process of preparing a single repair mortar-concrete specimen 4 is as follows: Apply lubricating oil on the side walls and bottom plate of the mold, then pour concrete slurry into the mold until it reaches half of the mold volume and stop. Cover the top of the concrete slurry with the middle plate 11. After the concrete slurry begins to set, remove the middle plate 11. After roughening the top of the concrete, pour mortar on the top of the concrete until the mold overflows. After pouring, place the whole in a standard curing room for curing until the age of the specimen, then demold. The demolded specimen is then placed in a standard curing room for further curing to obtain the repair mortar-concrete specimen 4. The temperature of the standard curing room is 20 ± 3°C, and the relative humidity is not less than 90%. The volume of each repair mortar-concrete specimen 4 is 100mm × 100mm × 100mm. Each repair mortar-concrete specimen 4 includes a concrete part 2 and a mortar part 1 from bottom to top. The volume of the mortar part 1 is 100mm × 100mm × 50mm, and the volume of the concrete part 2 is 100mm × 100mm × 50mm. In this embodiment, the repair mortar-concrete specimen 4 prepared has a mortar part 1 made of polyurethane repair mortar and a concrete part 2 made of C30 concrete, which is the repair mortar-concrete specimen 5. Among them, the polyurethane repair mortar is composed of a vegetable oil-modified polyether polyol aqueous dispersion, an active isocyanate group functional group substance, an inorganic active aggregate, and a color paste. The mass ratio of the vegetable oil-modified polyether polyol aqueous dispersion, the active isocyanate group functional group substance, the inorganic active aggregate, and the color paste is 0.71:1.09:9.5:0.5. Among them, the C30 concrete is composed of the following substances: cement 402 kg / m 3 、crushed stone 1130 kg / m 3 、sand 664 kg / m 3 、water 205 kg / m 3 ; Step 3: Conduct a falling ball impact test on one group of repair mortar-concrete specimens 4 using a falling ball impact test device, measure the compressive strength of the other group of repair mortar-concrete specimens 4 and calculate the average value of the compressive strength of this group, f calculate the impact damage rate a and establish a relationship curve between the impact damage rate a and the depression volume V1; The specific process is as follows: Step 3.1: Conduct a falling ball impact test on one group of repair mortar-concrete specimens 4. The specific process is as follows: Place the repair mortar-concrete test block 4 into the specimen fixture 3, rotate the hand crank 7 to drive the spool 15 to rotate and wind the rope 12 onto the spool 15. Adjust the falling height of the steel ball 6 to 5.1 m. At this falling height, the speed of the steel ball 6 reaching the surface of the repair mortar-concrete test block 4 is equal to the average water flow impact speed obtained in step 1 v which is 10 m / s. At this time, stop rotating the hand crank 7, engage the safety lock 8 with the small crossbeam 18 to fix the position of the spool 15. When the formal test is carried out, open the safety lock 8, and the steel ball 6 drives the spool 15 to rotate and release the rope 12. Then the steel ball 6 falls onto the upper surface of the repair mortar-concrete test block 4 to impact the surface of the repair mortar-concrete test block 4. After the impact, use the sand replacement method to measure the depression volume V1 of the surface of the repair mortar-concrete test block 4; Step 3.2, Repeat step 3.1 to impact the surface of the repair mortar-concrete test block 4 multiple times until the surface depression volume V1 reaches the preset value and then stop the impact; In this embodiment, the preset value of the depression volume V1 is shown in Table 2; Step 3.3, After the impact, measure the compressive strength of the repair mortar-concrete test block 4 after the impact through a compressive strength test f 0 ; In this embodiment, the number of repair mortar-concrete test blocks 4 used for the drop ball impact test is 7; Step 3.4, Measure the compressive strength of another group of repair mortar-concrete test blocks 4 through a compressive strength test and calculate the average value of the compressive strength of this group f , in this embodiment f = 41 MPa; In this embodiment, the number of another group of repair mortar-concrete test blocks 4 is 1; Step 3.5 According to the compressive strength obtained in step 3.3 f 0 and the average value of the compressive strength obtained in step 3.4 f , calculate the impact damage rate a ; ; The specific test data is shown in Table 2: Table 2

[0029] Step 3.6, According to the impact damage rate obtained in step 3.5 a and the depression volume V1, establish a relationship curve of the impact damage rate Figure 6 as shown a between the impact damage rate and the depression volume V1; Step 4, According to the impact damage ratea Find the impact damage rate corresponding to the water flow impact time \(t\) when the depression volume \(V1\) is equal to the depression volume \(V2\) from the relationship curve between the impact damage rate and the depression volume \(V1\) and the relationship curve between the water flow impact time \(t\) and the depression volume \(V2\). a Calculate the impact damage rate corresponding to the water flow impact time \(t\). b , ; If the impact damage rate \(a\) of the repaired area with the water flow impact time \(t = 148d\) of the water discharge structure is measured to be \(0.461\), then the impact damage rate \(b=0.461 / 148 = 0.0031\).

Claims

1. A method for testing the impact damage rate of a water discharge structure repair area, characterized in that: The specific steps are as follows: Step 1: Repair the area to be repaired of the water discharge structure and install a flow velocity meter, open the gate to discharge water, and obtain the water flow impact time. t Average water impact velocity under v and the depression volume V2 of the area to be repaired, and establish a relationship curve between the water flow impact time t and the depression volume V2; Step 2, preparing a number of repair mortar-concrete test blocks (4), divided into two groups; Step 3, using a falling ball impact test device to perform a falling ball impact test on a group of repair mortar-concrete test blocks (4), measuring the compressive strength of another group of repair mortar-concrete test blocks (4) and calculating the average compressive strength of the group f , calculate the impact damage rate a And establish the impact damage rate a Relationship curve with the concave volume V1; Step 4: Obtain the impact damage rate when the concave volume V1 is equal to the concave volume V2 a and water flow impact time t, calculate the impact damage rate b .

2. The method for testing the impact damage rate of the repair area of ​​a water discharge structure according to claim 1, characterized in that: In step 1, obtain the water flow impact time t The process of measuring the sunken volume V2 of the area to be repaired under different water flow impact times t is as follows: when the set water flow impact time t is reached, the gate is closed, and after there is no water impacting the area to be repaired, a three-dimensional scanner is used to scan the area to be repaired to obtain a three-dimensional model of the area to be repaired, and the sunken volume V2 of the area to be repaired is calculated according to the shape and size of the sunken in the three-dimensional model. After the scanning is completed, the gate is opened to release water to measure the sunken volume V2 of the area to be repaired under different water flow impact times t.

3. The method for testing the impact damage rate of the repair area of ​​a water discharge structure according to claim 1, characterized in that: The process of preparing a single repair mortar-concrete test block (4) in step 2 is as follows: applying lubricating oil on the side wall and bottom plate of the mold, pouring concrete slurry into the mold until it reaches half the volume of the mold, covering the top of the concrete slurry with a middle plate (11), removing the middle plate (11) after the concrete slurry is initially set, roughening the top of the concrete, pouring mortar on the top of the concrete until the mold is full, and after pouring is completed, placing the entire block in a standard curing room for curing to a certain age before demoulding. The demoulding block is then placed in a standard curing room for curing to obtain a repair mortar-concrete test block (4).

4. The method for testing the impact damage rate of the repair area of ​​a water discharge structure according to claim 3, characterized in that: The volume of each repair mortar-concrete test block (4) is 100mm×100mm×100mm, the volume of the mortar part is 100mm×100mm×50mm, and the volume of the concrete part is 100mm×100mm×50mm.

5. The method for testing the impact damage rate of the repair area of ​​a water discharge structure according to claim 3, characterized in that: The mould comprises a square bottom plate (9), four sides of the square bottom plate (9) are connected to side plates (10), and adjacent side plates (10) are connected to each other.

6. The method for testing the impact damage rate of the repair area of ​​a water discharge structure according to claim 1, characterized in that: In step 3, the falling ball impact test device comprises a base (13), the base (13) is provided with a specimen holder (3), one end of the base (13) is connected to a telescopic bracket (5), the top of the telescopic bracket (5) is connected to one end of an L-shaped beam (14), the other end of the L-shaped beam (14) is inserted into a spool (15), a rope (12) is wound around the spool (15), one end of the rope (12) is connected to the spool (15), and the other end of the rope (12) is connected to the steel ball (6). The steel ball (6) corresponds to the position of the specimen holder (3); a hand crank (7) is arranged on the side wall of the spool (15) away from the L-shaped beam (14); an L-shaped safety lock (8) is rotatably connected to the L-shaped beam (14) via a pin (16); a stopper (17) is arranged at one end of the pin (16) away from the L-shaped beam (14); a plurality of small beams (18) are arranged on the side wall of the spool (15) close to the L-shaped beam (14) and along the circumference thereof; and the safety lock (8) cooperates with the small beams (18).

7. The method for testing the impact damage rate of the repair area of ​​a water discharge structure according to claim 6, characterized in that: The specific process of step 3 is: Step 3.1, performing a drop ball impact test on one group of repair mortar-concrete test blocks (4); The specific process is as follows: the repair mortar-concrete test block (4) is placed in the test piece holder (3), the hand crank (7) is turned to drive the spool (15) to rotate and wind the rope (12) onto the spool (15) to adjust the falling height of the steel ball (6), and when the falling height makes the speed of the steel ball (6) reaching the surface of the repair mortar-concrete test block (4) equal to the average water flow impact speed obtained in step 1 v When the values ​​of the two axes are equal, the hand crank (7) is stopped from rotating, and the safety lock (8) is engaged with the small crossbeam (18) to fix the position of the spool (15). When the formal test is performed, the safety lock (8) is opened, and the steel ball (6) drives the spool (15) to rotate to release the rope (12), so that the steel ball (6) falls to the upper surface of the repair mortar-concrete test block (4) and impacts the surface of the repair mortar-concrete test block (4). After the impact, the concave volume V1 on the surface of the repair mortar-concrete test block 4 is measured by the sand filling method; Step 3.2, repeating step 3.1, impacting the surface of the repair mortar-concrete test block 4 multiple times until the surface depression volume V1 reaches a preset value and then stopping the impact; Step 3.3: After the impact, the compressive strength of the repair mortar-concrete specimen (4) after the impact is measured by a compressive strength test. f 0; Step 3.4, using a compressive strength test to measure the compressive strength of another group of repair mortar-concrete test blocks (4) and calculate the average compressive strength of the group f ; Step 3.5 Compressive strength obtained according to step 3.3 f 0 and the average of the compressive strength obtained in step 3.4 f , calculate the impact damage rate a ; Step 3.6, according to the impact damage rate obtained in step 3.5 a and the dent volume V1, to establish the impact damage rate a Relationship curve with the concave volume V1.

8. The method for testing the impact damage rate of the repair area of ​​a water discharge structure according to claim 7, characterized in that: In step 3.5, the impact damage rate a The expression is: 。 9. The method for testing the impact damage rate of the repair area of ​​a water discharge structure according to claim 7, characterized in that: In step 4, the impact damage rate b The expression is: 。

Images