Crushing agent for underwater foundation pile and using method thereof

Abstract

The invention relates to the field of crushing agents, and provides a crushing agent for an underwater foundation pile and a use method of the crushing agent in order to solve the problem that the crushing capacity is seriously influenced by a water body when an existing crushing agent is applied to the underwater foundation pile of a silt-laden water area, and the crushing agent for the underwater foundation pile comprises a component A and a component B in parts by weight, the component A is prepared from 90 to 100 parts of overburnt lime, 10 to 20 parts of a hardening agent, 0.1 to 0.3 part of a water reducing agent, 3 to 5 parts of a retarder, 1 to 2 parts of a thickening agent and 1 to 2 parts of a flocculating agent; and the component B comprises 15-25 parts of a dispersing agent. By means of the double-component crushing agent, the influence of silt in crushing holes on the crushing effect is reduced, and meanwhile the crushing capacity can be suitable for a conventional underwater foundation pile; in addition, the desilting capacity of a pasty slurry system is improved through the composition and proportion of the components; and through the arrangement of the inclined holes and the cooperation of the crushing agent, the influence of the sand on the crushing agent system in the sand discharging process is further reduced.

Description

Technical Field

[0001] The present invention relates to the field of crushing agents, and in particular to a crushing agent for underwater pile foundations and a method for using the same. Background Art

[0002] A crushing agent is a chemical substance used to crush hard materials such as rocks and concrete. It produces expansion pressure through chemical reactions, thereby achieving the crushing effect. Compared with traditional blasting methods, the use of crushing agents has the advantages of safety, environmental protection, and easy operation. It is especially suitable for fine operations in the fields of urban building demolition, mining, tunnel construction, etc. or occasions with strict restrictions on noise and vibration. The main components of crushing agents usually include aluminum powder, calcium oxide, sodium hydroxide, etc. After mixing, these components can absorb moisture in the air to react chemically, generate a large amount of gas and expand in volume, generate strong internal pressure, and eventually cause the rock or concrete to break.

[0003] When dismantling a bridge across a water area, it is necessary to dismantle its underwater foundation piles. Common methods for dismantling underwater foundation piles include cutting, hydraulic breaker hammers, and blasting, which are either large projects with high noise or have a large impact on the water body. The patent with publication number CN105837107B discloses an underwater static crushing agent and its preparation method, which introduces static crushing technology into underwater engineering projects and solves the technical problem that static crushing agents cannot directly statically crush concrete projects in water. However, when it is used in water bodies with a lot of sediment, when the paste slurry formed by the crushing agent is poured into the water cannon hole, the paste slurry may be dispersed, affecting the crushing effect. Summary of the invention

[0004] The object of the present invention is to provide a breaker for underwater foundation piles, so as to solve the problem that the breaking ability of the existing breaker is seriously affected by the water body when it is applied to underwater foundation piles in silty waters.

[0005] The present invention also aims to provide a method for using a breaker, which realizes the crushing operation of underwater foundation piles through the coordination of hole arrangement and the breaker.

[0006] The embodiments of the present invention are implemented by the following technical solutions:

[0007] A breaker for underwater foundation piles, comprising, by weight: component A and component B;

[0008] The component A comprises: 90-100 parts of burnt lime, 10-20 parts of hardener, 0.1-0.3 parts of water reducer, 3-5 parts of retarder, 1-2 parts of thickener and 1-2 parts of flocculant;

[0009] The component B comprises: 15-25 parts of dispersant.

[0010] If the water body has a high sediment content, after drilling the underwater foundation pile, the hole may contain sediment. At this time, when the conventional paste crusher is poured into the crushing hole, it may be dispersed under the cooperation of the pouring force and the obstruction of sediment, and the sediment is difficult to be completely discharged from the hole, affecting the final crushing effect. Even if the paste crusher is bagged and placed in the crushing hole to avoid its dispersion during placement, the sand discharge effect of the bagged crusher is lower, and most of the sediment will be pressed at the bottom of the crushing hole, seriously affecting the crushing effect of the crusher. After the bag is crushed, it may also affect the reaction process of the crusher. If too much sediment remains in the crushing hole, it will affect the stress transfer in the axial and radial directions of the hole during the expansion of the crusher. Since the space inside the crushing hole is less affected by the flow velocity and flow direction of the water flow, the sediment is easy to sink to the bottom, and after sinking to the bottom, it has a greater impact on the axial stress transfer of the crusher. Due to the presence of silt, the crushing agent does not directly squeeze the surrounding hard concrete piles when expanding, but first squeezes the silt that can be deformed to a certain extent, and then transmits stress through the silt, increasing the crushing time. In addition, the silt is mostly weathered rock and soil under the water flow, and its structural strength is mostly lower than the surrounding concrete piles, which will further affect the crushing effect of the crushing agent. In response to the above problems, the applicant hopes to conceive a crushing agent that is not affected by silt, so that the range of water bodies in which it can be applied is increased.

[0011] The applicant first hopes to improve the layout of the crushing holes and the injection position of the crushing agent to achieve the crushing agent pushing the sediment from the bottom of the sediment to be discharged from the upper hole. However, the conventional crushing agent is still easily dispersed by the sediment during the sand discharge process, which makes it difficult to achieve a good sand discharge effect and causes waste of crushing agent. The applicant has made improvements to the components and proportions of the conventional crushing agent mentioned above.

[0012] As the main component of the crushing agent, burnt lime slowly expands in volume after reacting with water, squeezing the surrounding foundation piles, thereby gradually crushing the concrete of the foundation piles. The hardener can increase the strength of the expansion system, increase the expansion pressure, and thus increase the crushing rate. The water reducer can reduce the water content of the expansion system, especially to avoid excessive increase in water content and reduction of expansion stress under the influence of water accumulation in the crushing hole when the crushing agent is poured. In addition, the water reducer can also increase the curing strength of the system, thereby increasing the crushing effect. The retarder can adjust the reaction speed of the system to prevent too fast curing. The thickener can improve the fluidity and stability of the crushing agent.

[0013] In order to avoid the situation that when pouring the paste slurry formed by the mixture of crushing agent and water, the stability of the paste slurry system is difficult to effectively push the silt out of the crushing hole, and the silt may even be mixed into the slurry system. Therefore, the applicant considers whether it is possible to increase the density or viscosity of the system without affecting the crushing effect. However, when the viscosity is excessively increased, the pressure required for pouring will increase sharply. Therefore, this case adds a dispersant system layered with it on the premise of the aforementioned paste slurry system. The dispersant is first injected into the crushing hole, so that part of the accumulated silt is dispersed and evenly suspended in the water in the crushing hole, thereby reducing the power demand of the subsequent paste slurry system to push the silt out, reducing the viscosity required for the paste slurry system, and then pouring the paste slurry system so that the water above it brings out the suspended silt. After adding the dispersant, the amount of thickener used in the present invention is relatively reduced. In order to reduce the mixing between the paste slurry system and the dispersant system in the perfusion device during perfusion and achieve stable stratification, the present invention also adds a flocculant, so that the substances in the paste slurry system are bridged by long-chain polymers to form prepolymers, and the whole is flocculent. At the same time, after the dispersant increases the viscosity of the system, the amount of thickener used can be further reduced.

[0014] The hardener can be silicate cement; the water reducer can be lignin sulfonate, naphthalene-based high-efficiency water reducer, melamine-based high-efficiency water reducer, aminosulfonate-based high-efficiency water reducer, fatty acid-based high-efficiency water reducer and polycarboxylate-based high-efficiency water reducer, and preferably, lignin sulfonate water reducer is used; the retarder can be tartaric acid, citric acid and methyl cellulose; the thickener can be cellulose, acrylate and polyurethane, and preferably, acrylate is used; the dispersant can be polycarboxylate polymer, fatty acid salt and sodium polyacrylate, and the flocculant can be cellulose, polyacrylamide and hydroxystyrene copolymer, and the like.

[0015] It should be noted that the flocculant cannot be excessive and needs to fully react in the paste slurry system to avoid the sand in the water falling back into the paste slurry system when it is used. Therefore, the control ability of the flocculant on the reaction of the crusher will be relatively reduced due to the reduction in the amount of addition, and the amount of the retarder used will be appropriately increased.

[0016] In addition, it was found during the test that the ratio parameters of the components must ensure good sand discharge performance, and the crushing performance cannot be maximized. However, the cross-sectional area of ​​the underwater foundation pile is basically about 6 square meters. The crushing capacity of the crushing agent provided by the present invention is set based on the underwater foundation pile, so that even if the ratio is not taken to achieve the maximum crushing capacity, it is still sufficiently applicable and can also ensure sand discharge performance. While ensuring the sand discharge performance, the applicant hopes that the crushing capacity of the crushing agent is as high as possible.

[0017] Preferably, the retarder is methyl cellulose, and the flocculant is hydroxystyrene copolymer.

[0018] During the test, it was found that when a retarder is not used, since the present invention uses a retarder, the retarder will form a thin film on the surface of overburned lime or cement particles, etc., which acts as a hydration shield to control its reaction rate. Therefore, it is necessary to consider the binding ability of the film with the long-chain molecules in the flocculant, thereby ensuring that the prepolymer formed by flocculation has good sand removal performance. In order for the flocculant to better bridge with the aforementioned coated particles, the film and the flocculant need to have more mutually coordinated active sites. Therefore, the selection of the retarder and the flocculant will affect the maximum force that the paste slurry system can exert on the sediment. After the applicant realized it, it was found that when the retarder is methyl cellulose and the flocculant is hydroxystyrene copolymer, the crushing agent has good crushing ability and sand removal effect. In addition, methyl cellulose itself also has a certain thickening effect, which can further reduce the amount of thickener used.

[0019] Preferably, the dispersant comprises fatty acid salt and acrylate copolymer; the mass ratio of fatty acid salt to acrylate copolymer is 1:2-7:9; and the molecular weight of acrylate copolymer is 2500-4500.

[0020] In addition to dispersing the sand and stably suspending it in the water in the hole, the dispersant in the present invention also needs to be stably stratified with the paste slurry system and dispersed in the water relatively quickly. Therefore, the present invention selects a dispersant that meets the above conditions. At the same time, it is also necessary to consider that the fatty acid salt is not easy to be too high to avoid affecting the acrylate copolymer. In the experiment of the present invention, the acrylate copolymer adopts FLOWLEN GW-1500 of Japan Kyoeisha. Since the molecular weight of the high molecular weight polymer in the dispersant is not unique, the present invention defines the range of the molecular weight of the polymer in the dispersant system.

[0021] A method for using a breaker for underwater foundation piles, comprising:

[0022] S100, drilling a foundation pile: drilling a vertical hole in the vertical direction of the foundation pile; drilling an oblique hole in an oblique downward direction from the side wall of the foundation pile; the oblique hole is connected to the bottom end of the vertical hole;

[0023] S200, pouring: After stirring the water in the vertical hole, pour component B from the inclined hole through the pouring device, and then seal the upper opening of the vertical hole; after 15-30 minutes, release the upper opening of the vertical hole, and pour the paste slurry prepared by component A from the inclined hole through the pouring device until its upper slurry surface reaches the upper opening of the vertical hole;

[0024] S300, plugging the vertical hole and the inclined hole openings;

[0025] Preparation of paste slurry: By weight, 80-100 parts of component A and 20-30 parts of water are mixed and reacted to obtain a paste slurry system.

[0026] The present invention improves the conventional drilling method by adding an inclined hole connected to the bottom of the vertical hole, and then injecting a dispersant through the inclined hole so that the silt in the hole is stably suspended in the water in the hole, and then injecting a paste slurry through the inclined hole. The paste slurry and the aforementioned water body are in a stratified state, and as the paste slurry increases, the aforementioned water body is gradually discharged from the upper mouth of the vertical hole, and the silt suspended in the water body is also discharged together with the aforementioned water body. In order to reduce the time for the dispersant to be dispersed, the present invention first disperses and lifts up the aggregated or sunk silt again through disturbance by stirring before injecting the dispersant. When the injection device absorbs the crushing agent system, it can first absorb the paste slurry and then absorb the dispersant. Since the two can be stably stratified, the same injection device can be used for the injection operation.

[0027] Preferably, the method for preparing the paste slurry comprises:

[0028] D100, mixing the burnt lime, hardener, water reducer, and retarder in component A with water, and reacting for 10-15 minutes to obtain a prefabricated slurry;

[0029] D200, mixing the pre-made slurry with the flocculant in component A, reacting for 15-20 minutes, to obtain the second slurry;

[0030] D300, mix the second slurry with the thickener in component A, and after 15-25 minutes, obtain a paste slurry.

[0031] The addition of water reducer at D100 can reduce the combination of free water in D200 with the active sites of flocculant, and the flocculant can be combined with the coated overburned lime or hardener to form a prepolymer with better sand removal performance by combining with the powder. After the overburned lime and hardener are treated on the surface, they are reacted with the flocculant to avoid the premature addition of the flocculant affecting the surface treatment effect, thereby affecting the expansion rate control. Since flocculants and thickeners are mostly high molecular compounds, such as cellulose, they can be used separately to avoid affecting the sand removal performance of the final prepolymer.

[0032] Preferably, the aperture of the vertical hole is consistent with that of the inclined hole, and the outer wall of the injection end of the injection device abuts against the inner wall of the inclined hole; when the paste slurry is injected, the thickness of the paste slurry layer in the injection device decreases by 2-4 cm per second.

[0033] In order to ensure that the paste slurry does not mix with the water in the hole due to the high injection speed, affecting the subsequent crushing effect, the injection speed needs to be controlled. Under the condition of ensuring stratification, the highest possible injection speed should be selected. The receiving area in the injection device is a regular column to control the injection speed.

[0034] Exemplarily, when the injection device is an injection device, the injection speed can be controlled by controlling the extension speed of the piston rod.

[0035] Preferably, when the dispersant is poured, the thickness of the dispersant layer in the pouring device decreases by 4-8 cm per second.

[0036] In order to avoid mixing of the paste slurry and the dispersant in the injection device, the speed of injecting the dispersant should not be too fast. However, the density of the conventional dispersant system is greater than the water in the hole, so the injection speed can be relatively increased.

[0037] Preferably, the opening of the inclined hole is a threaded hole, and the outer wall of the filling port of the filling device is provided with an external thread matching the threaded hole.

[0038] After the dispersant is poured, it takes a certain amount of time before the paste slurry can be poured. At this time, both the vertical holes and the inclined holes need to be sealed. Cement bags can be used to seal the vertical holes, and the inclined holes can be directly sealed using a pouring device. After the dispersant takes effect, the paste slurry can be poured directly through the same pouring device, which makes the operation simpler.

[0039] The injection device can adopt a syringe structure, and the movement of the piston part is driven by a cylinder and the stroke is controlled.

[0040] Preferably, the vertical holes are arranged in a ring shape, with a ring radius of 30-40 cm, a hole diameter of 32-45 mm, and a hole spacing of 25-40 cm.

[0041] The annular radius is based on the distance from the center of the hole cross section to the center of the annular circle. According to the crushing capacity of the crushing agent of the present invention, a reasonable hole layout is performed. In addition, the inclination of the inclined hole can be selected to be 45 degrees to 75 degrees. Due to the existence of the inclined hole, the foundation pile will be subjected to expansion stress in both horizontal and vertical directions during the crushing process, the crushing effect is also better, and the crushing time is shortened.

[0042] The present invention has at least the following beneficial effects:

[0043] The present invention reduces the influence of sediment in the crushing hole on the crushing effect through the dual-component crushing agent, and the crushing capacity is suitable for conventional underwater pile foundations; in addition, the sand discharge capacity of the paste slurry system is increased through the component composition and ratio; through the arrangement of inclined holes and the coordination of crushing agents, the influence of sand on the crushing agent system during the sand discharge process is further reduced. DETAILED DESCRIPTION

[0044] In order to make the purpose, method scheme and advantages of the embodiments of the present invention clearer, the method scheme in the embodiments of the present invention is clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0045] Embodiment 1: A breaker for underwater pile foundations comprises, in parts by weight: component A and component B; component A comprises: 90 parts of burnt lime, 15 parts of Portland cement, 0.2 parts of calcium lignin sulfonate, 4.5 parts of methyl cellulose, 1 part of acrylate and 1.5 parts of hydroxystyrene copolymer; component B comprises: 20 parts of dispersant; the dispersant comprises sodium fatty acid and acrylate copolymer; the mass ratio of fatty acid salt to acrylate copolymer is 1:2; the molecular weight of acrylate copolymer is 2500-4500.

[0046] Embodiment 2: A breaker for underwater pile foundations, comprising, in parts by weight: component A and component B; component A comprises: 90 parts of burnt lime, 15 parts of Portland cement, 0.2 parts of calcium lignin sulfonate, 4.5 parts of methyl cellulose, 1 part of acrylate and 1.5 parts of hydroxystyrene copolymer; component B comprises: 20 parts of dispersant; the dispersant comprises sodium fatty acid and acrylate copolymer; the mass ratio of fatty acid salt to acrylate copolymer is 7:9; the molecular weight of acrylate copolymer is 2500-4500.

[0047] Embodiment 3: A breaker for underwater pile foundations, comprising, in parts by weight: component A and component B; component A comprises: 90 parts of burnt lime, 15 parts of Portland cement, 0.2 parts of calcium lignin sulfonate, 4.5 parts of methyl cellulose, 1 part of acrylate and 1.5 parts of hydroxystyrene copolymer; component B comprises: 20 parts of dispersant; the dispersant comprises sodium fatty acid and acrylate copolymer; the mass ratio of fatty acid salt to acrylate copolymer is 4:7; the molecular weight of acrylate copolymer is 2500-4500.

[0048] Embodiment 4: A breaker for underwater pile foundations, comprising, in parts by weight: component A and component B; component A comprises: 95 parts of burnt lime, 20 parts of Portland cement, 0.3 parts of calcium lignin sulfonate, 5 parts of methyl cellulose, 2 parts of acrylate and 2 parts of hydroxystyrene copolymer; component B comprises: 25 parts of dispersant; the dispersant comprises sodium fatty acid and acrylate copolymer; the mass ratio of fatty acid salt to acrylate copolymer is 4:7; the molecular weight of acrylate copolymer is 2500-4500.

[0049] Example 5: A breaker for underwater pile foundations, comprising, in parts by weight: component A and component B; component A comprises: 100 parts of burnt lime, 10 parts of Portland cement, 0.1 parts of calcium lignin sulfonate, 3 parts of methyl cellulose, 1.5 parts of acrylate and 1 part of hydroxystyrene copolymer; component B comprises: 15 parts of dispersant; the dispersant comprises sodium fatty acid and acrylate copolymer; the mass ratio of fatty acid salt to acrylate copolymer is 4:7; the molecular weight of acrylate copolymer is 2500-4500.

[0050] Comparative Example 1: A breaker for underwater foundation piles, comprising, by weight: component A and component B; component A comprises: 95 parts of burnt lime, 20 parts of Portland cement, 0.3 parts of calcium lignin sulfonate, 5 parts of methyl cellulose, 2 parts of acrylate and 2 parts of hydroxystyrene copolymer; component B comprises: 25 parts of acrylate copolymer; the molecular weight of the acrylate copolymer is 2500-4500.

[0051] Comparative Example 2: A breaker for underwater foundation piles, comprising, in parts by weight: component A and component B; the component A comprises: 95 parts of burnt lime, 20 parts of Portland cement, 0.3 parts of calcium lignin sulfonate, 5 parts of methyl cellulose, 2 parts of acrylate and 2 parts of hydroxystyrene copolymer; the component B comprises: 25 parts of sodium fatty acid.

[0052] Comparative Example 3: A breaker for underwater foundation piles, comprising, in parts by weight: component A and component B; the component A comprises: 95 parts of burnt lime, 20 parts of Portland cement, 0.3 parts of calcium lignin sulfonate, 5 parts of methyl cellulose, 2 parts of acrylate and 2 parts of hydroxystyrene copolymer; the component B comprises: 25 parts of a dispersant; the dispersant comprises sodium fatty acid and an acrylate copolymer; the mass ratio of the fatty acid salt to the acrylate copolymer is 1:1; the molecular weight of the acrylate copolymer is 2500-4500.

[0053] Comparative Example 4: A breaker for underwater foundation piles, comprising, in parts by weight: component A and component B; component A comprises: 95 parts of burnt lime, 20 parts of Portland cement, 0.3 parts of calcium lignin sulfonate, 5 parts of methyl cellulose, 0.3 parts of acrylate and 2 parts of hydroxystyrene copolymer; component B comprises: 25 parts of dispersant; the dispersant comprises sodium fatty acid and acrylate copolymer; the mass ratio of fatty acid salt to acrylate copolymer is 4:7; the molecular weight of acrylate copolymer is 2500-4500.

[0054] Comparative Example 5: A breaker for underwater foundation piles, comprising, in parts by weight: component A and component B; the component A comprises: 95 parts of burnt lime, 20 parts of Portland cement, 0.3 parts of calcium lignin sulfonate, 5 parts of methyl cellulose, and 2 parts of acrylate; the component B comprises: 25 parts of a dispersant; the dispersant comprises sodium fatty acid and an acrylate copolymer; the mass ratio of the fatty acid salt to the acrylate copolymer is 4:7; the molecular weight of the acrylate copolymer is 2500-4500.

[0055] Preparation method 1: The preparation method of the paste slurry includes:

[0056] D100, the burnt lime, hardener, water reducer and retarder in component A are mixed with water, and reacted for 15 minutes to obtain a prefabricated slurry system; water accounts for 30wt% of the prefabricated slurry;

[0057] D200, mixing the pre-made slurry with the flocculant in component A, reacting for 15 minutes, and obtaining the second slurry;

[0058] D300, mix the second slurry with the thickener in component A, and after 20 minutes, obtain a paste slurry.

[0059] Preparation method of dispersant solution: dissolve component B in water to obtain a dispersant solution, and the mass ratio of water to component B is 4:9.

[0060] Preparation method 2: The preparation method of the paste slurry includes: mixing all the components in component A with water to obtain a paste slurry; the water accounts for 30wt% of the prefabricated slurry.

[0061] Preparation method of dispersant solution: dissolve component B in water to obtain a dispersant solution, and the mass ratio of water to component B is 4:9.

[0062] Test 1: Using the crushing agent components of Examples 1-5 and Comparative Examples 1-5, a paste slurry and a dispersant solution were prepared by using the configuration methods 1 and 2, respectively, and the sand removal performance of the crushing agent was tested. The sand removal performance simulation test experimental steps are as follows:

[0063] (1) Make cylindrical concrete simulated foundation piles with a radius of 5 cm and a height of 25 cm;

[0064] (2) Drill a vertical hole and an inclined hole in the center of the simulated concrete foundation pile. The length of the vertical hole is 20 cm, the inclination angle of the inclined hole is 45 degrees, and the diameter of the vertical hole and the inclined hole are both 2 cm;

[0065] (3) Fill the bored hole of the foundation pile with sandy river water and let it stand for 20 minutes;

[0066] (4) Use a syringe to first draw 0.7L of paste slurry, then draw 80ml of dispersant solution. After stirring the water in the vertical hole at a speed of 1r / s for 20s, use a syringe to first inject the dispersant solution into the borehole through the inclined hole. After 20min, continue to inject the paste slurry into the borehole until its upper slurry surface reaches the vertical hole mouth. During the sand discharge process of the paste slurry, collect the discharged river water, filter it, dry it, and measure the weight of the sediment A; after the sand discharge is completed, wash the paste slurry in the borehole with clean water, filter it, dry it, and measure the weight of the sediment B; calculate the sand discharge performance After measuring each group of tests 5 times, the average value is taken. The test results are shown in Table 1 (Method 1 refers to preparation method 1, and Method 2 refers to preparation method 2).

[0067] Table 1

[0068]

[0069]

[0070] It can be seen from the test results that after using the crushing agent components provided in Examples 1-5 of the present invention and the preparation method of the components in Example 6, the crushing agent of the present invention has good sand removal performance, and the sand removal performance using the component ratio in Example 4 is the best.

[0071] It can be seen from the test results of the preparation method 1 and the preparation method 2 that the sand discharge performance is better after adopting the segmented preparation method provided by the present invention.

[0072] From the comparison between Comparative Examples 1-2 and Example 4, it can be seen that when the dispersant adopts a single component, the dispersion effect decreases, resulting in a decrease in the sand removal effect.

[0073] From the comparison between Comparative Example 3 and Example 4, it can be seen that when the fatty acid salt is excessive, the dispersing effect of the dispersant is reduced.

[0074] From the comparison between Comparative Example 4 and Example 4, it can be seen that even if a flocculant is used, a sufficient amount of thickener needs to be added to ensure the sand discharge performance.

[0075] From the comparison between Comparative Example 5 and Example 4, it can be seen that the addition of flocculant can greatly improve the sand removal performance of the crushing agent.

[0076] Test 2: The crushing agent components of Examples 1-5 and Comparative Examples 1-4 were used to prepare paste slurries using configuration methods 1 and 2, respectively, and the crushing performance of the crushing agent was tested. The crushing performance was tested in accordance with the relevant provisions of JC506-2008 "Silent Crusher" for setting time (min) and expansion pressure (MPa). The test temperature was 35°C. The test results of configuration method 1 are shown in Table 2, and the test results of configuration method 2 are shown in Table 3. Each group of tests was tested 5 times and the average value was taken.

[0077] Table 2

[0078]

[0079] Table 3

[0080]

[0081] From the test results of Examples 3-5 in Table 1, it can be seen that the crushing agents provided by the embodiments of the present invention have good crushing performance. Among them, the crushing agents provided by Examples 4-5 reached the superior grade, and the crushing agent provided by Example 3 reached the qualified grade.

[0082] From the comparison of the test results of Examples 3-5 in Table 1 and Table 2, it can be seen that the paste slurry preparation method provided by the present invention can improve its crushing performance, especially the control of reaction speed, and avoid the occurrence of spray holes. When the component ratio in Example 3 is used in combination with the preparation method 2, the expansion pressure performance of the crushing agent does not meet the standard.

[0083] From the comparison between Comparative Example 4 and Example 4 in Tables 2 and 3, it can be seen that when the amount of thickener is reduced, the expansion pressure performance of the crushing agent decreases. The applicant speculates that the reduction in the amount of thickener affects the strength of the hardener after hydration.

[0084] From the comparison between Comparative Example 5 and Example 4 in Tables 2 and 3, it can be seen that the addition of flocculant can effectively control the reaction rate and increase the expansion pressure to a certain extent. The applicant speculates that the capture of solid particles by the long polymer chains in the flocculant has a certain anti-dispersion effect during the expansion process, making the structure of the expanded body more compact, thereby increasing the expansion pressure to a certain extent, especially the expansion pressure after 24 hours.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A breaker for underwater pile foundation, characterized in that: In parts by weight, it comprises: component A and component B; The component A comprises: 90-100 parts of burnt lime, 10-20 parts of hardener, 0.1-0.3 parts of water reducer, 3-5 parts of retarder, 1-2 parts of thickener and 1-2 parts of flocculant; The component B comprises: 15-25 parts of dispersant.

2. The crushing agent according to claim 1, characterized in that The retarder includes one or more of tartaric acid, citric acid and methyl cellulose; the flocculant includes one or more of cellulose, polyacrylamide and hydroxystyrene copolymer.

3. The crushing agent according to claim 2, characterized in that The retarder is methyl cellulose, and the flocculant is hydroxystyrene copolymer.

4. The crushing agent according to any one of claims 1 to 3, characterized in that The dispersant comprises fatty acid salt and acrylate copolymer; the mass ratio of fatty acid salt to acrylate copolymer is 1:2-7:9; the molecular weight of acrylate copolymer is 3000-4500.

5. A method for using the underwater pile foundation breaker according to any one of claims 1 to 4, characterized in that: include: S100, drilling a foundation pile: drilling a vertical hole in the vertical direction of the foundation pile; drilling an oblique hole in an oblique downward direction from the side wall of the foundation pile; the oblique hole is connected to the bottom end of the vertical hole; S200, pouring: After stirring the water in the vertical hole, pour component B from the inclined hole through the pouring device, and then seal the upper opening of the vertical hole; after 15-30 minutes, release the upper opening of the vertical hole, and pour the paste slurry prepared by component A from the inclined hole through the pouring device until its upper slurry surface reaches the upper opening of the vertical hole; S300, plugging the vertical hole and the inclined hole openings; Preparation of paste slurry: By weight, 80-100 parts of component A are mixed with 20-30 parts of water to obtain a paste slurry system.

6. The method of use according to claim 5, characterized in that: The preparation method of the paste slurry comprises: D100, mixing the burnt lime, hardener, water reducer and retarder in component A with water, and reacting for 10-15 minutes to obtain a prefabricated slurry; D200, mixing the pre-made slurry with the flocculant in component A, reacting for 15-20 minutes, to obtain the second slurry; D300, mix the second slurry with the thickener in component A, and after 15-25 minutes, obtain a paste slurry.

7. The method of use according to claim 5 or 6, characterized in that: The aperture of the vertical hole is consistent with that of the inclined hole, and the outer wall of the injection end of the injection device abuts against the inner wall of the inclined hole; when the paste slurry is injected, the thickness of the paste slurry layer in the injection device decreases by 2-4 cm per second.

8. The method of use according to claim 7, characterized in that: When the dispersant is poured, the thickness of the dispersant layer in the pouring device decreases by 4-8 cm per second.

9. The method of use according to claim 7, characterized in that: The opening of the inclined hole is a threaded hole, and the outer wall of the filling port of the filling device is provided with an external thread matched with the threaded hole.

10. The method of use according to claim 7, characterized in that: The vertical holes are arranged in a ring shape, with a ring radius of 30-40 cm, a hole diameter of 32-45 mm, and a hole spacing of 25-40 cm.

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