CN114436614A

CN114436614A - Static crushing agent, preparation method thereof and crushing method

Info

Publication number: CN114436614A
Application number: CN202210192045.8A
Authority: CN
Inventors: 徐可; 纪宪坤; 王丙垒; 闵强; 周清松; 赵娟
Original assignee: Wuhan Sanyuan Speical Building Materials Co Ltd
Current assignee: Wuhan Sanyuan Speical Building Materials Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-05-06
Anticipated expiration: 2042-02-28
Also published as: CN114436614B

Abstract

The invention discloses a static crushing agent, a preparation method thereof and a crushing method, and belongs to the technical field of expanding agents. A static crushing agent comprises the following raw materials in percentage by mass: 90-94.5% of calcium oxide clinker, 5-9.5% of gypsum, 0.1-0.3% of powder water reducer and 0.3-0.5% of organic retarder; the calcium oxide clinker is prepared by calcining a mixed raw material consisting of 94-97 parts by weight of limestone, 3-5 parts by weight of sulfuric acid residue and 0.5-1 part by weight of fluorite powder at a high temperature. The static crushing agent has the advantages of large static crushing force, orifice prevention, short crushing time, high hole filling safety and the like.

Description

Static crushing agent, preparation method thereof and crushing method

Technical Field

The invention belongs to the technical field of expanding agents, and particularly relates to a static crushing agent, and a preparation method and a crushing method thereof.

Background

At present, urban construction rises rapidly, and from the viewpoint of effectively utilizing urban land, dismantling old and new construction and rebuilding engineering are basic guidelines for construction. Because such projects are often carried out in places with dense population and concentrated buildings, no noise, no vibration, no flying stones and other public hazards are required in the construction process, the safety of nearby residents is not endangered, and the traditional construction method for blasting or large-scale mechanical demolition is often difficult to meet the requirements. Meanwhile, in the stone mining industry, the traditional explosive blasting method is adopted, the cracking direction of the stone is difficult to control, the cutting surface is irregular, hidden cracks exist, and the yield is low. In addition, in some special construction sites, due to the restriction of various conditions and reasons, explosive blasting methods are not suitable, such as: the explosion-proof requirement of densely populated districts, mine underground roadway construction and chemical plant construction is high, the explosive blasting method cannot be adopted, and because the explosive is limited by many conditions, static crushing materials and construction technology are often adopted for static demolition.

The static crushing method is that holes are drilled on a crushed body, a static crushing agent slurry which is uniformly mixed with water according to a certain proportion is injected into the holes to be kept still, and when expansion pressure generated by the volume expansion of the static crushing agent slurry acts on the hole wall along with the progress of hydration reaction, the circumferential tensile stress is generated on the periphery of the drilled holes, so that the crushed body is cracked along the arrangement direction of the drilled holes, and the crushed body is cracked to achieve the purpose of crushing; the method has the advantages of easy control of the explosive force, no vibration, no flying stone, no noise and no gas generation in the crushing process, and no adverse effect on other parts of the crushed object.

The static crushing agent is a material for crushing brittle medium by using material expansion force, and can be widely applied to rock and concrete crushing. For example, chinese patent CN110357559A discloses a safe static breaker for coal mine, which is prepared by the following method: adding water into the coarse whiting powder and the additive, uniformly mixing, and then baking to obtain a medicinal cake; the content of the heavy calcium powder is 85 to 95 percent; the additive is SiO₂、Fe₂O₃、Al₂O₃(ii) a Grinding the medicinal cake into powder, and packaging the powder into a column to obtain the safe static crushing agent for coal mines. But the coarse whiting powder has extremely high hydration reaction rate, no gelling activity, easy punching after hole filling, no concentrated annular expansion force and the like. For example, Chinese patent CN103788922A discloses a static crushing methodThe agent comprises the following components in percentage by weight: 90-94% of paraffin, 1-5% of heat-conducting substances and 3-5% of expansion reinforcing agents. The static crushing agent is prepared by adding a heat-conducting substance and an expansion reinforcing agent into a molten phase-change substance, and performing the working procedures of mixing, uniformly stirring, cooling, solidifying, crushing and the like. Still like chinese patent CN111039598A discloses a preparation method of static breaker, with spinning system nanofiber web composition such as organic macromolecular substance, improve crushing effect, with multiple metal powder blend, promote the storage effect to hydrogen with imitative nanoliposome etc. cooperation, the burst of accessible hydrogen improves crushing strength and effect during subsequent application to combine the popped material of multiple water, form the supplementary inflation crushing effect of different levels: however, the components of the static crushing agent are mainly organic materials, so that the production cost is high, and the defects that the self strength of the organic materials is high and the hoop expansion stress is not easy to concentrate after expansion are generated exist. Chinese patent CN110885222A discloses a high-efficiency silent cracking agent and its production method, which adopts expanded clinker: 85-95 parts of a solvent; sulphoaluminate cement clinker: 5-15 parts of a solvent; retarder: 0.1-0.4 part; alkali water agent: 0.1-0.7 part of a crushing agent product. Solves the problems that the prior product has lower working efficiency, shows that the early hydration reaction of the crushing agent is fast in temperature rise, the strength of the stone is low, the spraying hole is easy to generate, or the expansion stress is slow to increase, so that the crushing time is long, and the like, and also reduces the calcining temperature by adjusting the mineral components of the clinker of the expanding agent. However, the calcining temperature of the crushing agent is high, the calcium oxide liquid phase is required to be wrapped at a high temperature, the calcining rotating speed is slow, the aim of full calcining is fulfilled, the loss of a calcining kiln body is large, and the heat consumption is high.

Based on the current situation, a static crushing product which is large in annular expansion pressure, moderate in expansion reaction, not easy to punch and low in production cost, and an application method which is simple, convenient and efficient are urgently needed to be found.

Disclosure of Invention

In view of the defects of the prior art, one of the purposes of the invention is to provide a static crushing agent which has the advantages of large static crushing force, orifice prevention, short crushing time, high hole filling safety and the like.

In order to achieve the purpose, the specific technical scheme of the invention is as follows:

a static crushing agent comprises the following raw materials in percentage by mass: 90-94.5% of calcium oxide clinker, 5-9.5% of gypsum, 0.1-0.3% of powder water reducer and 0.3-0.5% of organic retarder;

the calcium oxide clinker is prepared by calcining a mixed raw material consisting of 94-97 parts by weight of limestone, 3-5 parts by weight of sulfuric acid residue and 0.5-1 part by weight of fluorite powder at high temperature; the fineness of the residue of the 0.08mm square-hole sieve of the calcium oxide clinker is less than or equal to 10 percent.

The static crushing agent of the invention is mainly calcined calcium oxide clinker wrapped by a certain iron phase, and the ore phase of the calcium oxide clinker contains a certain amount of C₂S and C₃S, etc. C₂S and C₃S has hydration gelling activity and can effectively prevent punching. A double-coagulation regulating material is formed by mixing a proper amount of gypsum and an organic retarder, and the gypsum and the organic retarder act together to regulate the coagulation time of the calcium oxide clinker; meanwhile, the reaction time of material expansion can be adjusted by combining the fineness of the clinker, and the flow state of a filling hole of the static crushing agent added with water is adjusted by the powder water reducing agent. The fluorite powder has the functions of reducing the liquid-phase melting point, so that the calcination temperature is reduced, the liquid-phase viscosity of the clinker during calcination can be increased, the iron element in the raw material is promoted to be melted to form liquid-phase wrapped calcium oxide clinker, the wrapping of the clinker is more sufficient and balanced, the reaction rate of the clinker is controlled, the ineffective expansion of the calcium oxide in the plastic stage during the reaction with water is reduced, and the effective expansion energy of the clinker is improved. Under the combined action of all the components, the static crushing agent has the advantages of large static crushing force, orifice spraying prevention, short crushing time, high hole filling safety and the like.

Preferably, the vertical lifting weight of the calcium oxide clinker is 1400-1500 g/L, and the content of f-CaO is 68-75 wt%.

Preferably, the organic retarder comprises at least one of sodium gluconate, tartaric acid, salicylic acid, triethanolamine or methylcellulose.

Another object of the present invention is to provide a method for preparing the static breaker, comprising the steps of:

s1, mixing and grinding the limestone, the sulfuric acid slag and the fluorite powder, and sieving by using a 0.08mm square-hole sieve to obtain a mixed raw material;

s2, pre-decomposing the mixed raw material obtained in the step S1, wherein the initial pre-decomposition temperature is 450 ℃, the post-stage pre-decomposition temperature is increased by 100 ℃, the final-stage pre-decomposition temperature is 850 ℃, and the pre-decomposition time of each stage is 20-30 min;

s3, calcining the raw material pre-decomposed in the step S2 at high temperature of 1250 +/-50 ℃ to obtain calcium oxide clinker;

and S4, grinding and sieving the calcium oxide clinker obtained in the step S3, mixing the ground calcium oxide clinker with the gypsum, the powder water reducing agent and the organic retarder, and mixing to obtain the static breaking agent.

In the preparation method of the crushing agent, ground mixed raw materials are pre-decomposed, and the pre-decomposition has the function of decomposing calcium carbonate in the raw materials in advance, so that the raw materials are decomposed layer by layer, the production efficiency of the calcium oxide clinker is improved, the high-temperature calcination time of the raw materials in a rotary kiln is reduced, the quality of the calcium oxide clinker is improved, and the productivity and the yield are improved simultaneously.

Still another object of the present invention is to provide a static crushing method using the static crushing agent, comprising the steps of:

p1, designing holes;

p2, drilling holes on the object to be crushed according to the hole distribution design;

p3, mixing the static crushing agent with water, and filling the mixture of the static crushing agent and the water into the drill hole;

and P4, after the hole filling is finished for 5-24 hours, removing the crushed body to finish the static crushing when the cracking seam width of the concrete is more than or equal to 1 mm.

Preferably, in the step P3, the mass ratio of the water to the static cracking agent is (0.26-0.30): 1.

Preferably, when the object to be crushed is unreinforced concrete, the static crushing method comprises the following steps: layering or blocking and crushing;

when the object to be crushed is reinforced concrete, the static crushing method comprises the following steps: arranging holes on the inner layer close to the steel bars, wherein the hole distance is 15-25 mm, firstly, expanding and cracking the concrete protective layer, cutting off the horizontal steel bars after exposing the steel bars, and drilling and crushing in the middle after eliminating the restraint of stirrups;

when the object to be crushed is a reinforced concrete flat plate structure, the static crushing method comprises the following steps: drilling an auxiliary hole in the center of the plate, and filling the static crushing agent into the auxiliary hole to crush the auxiliary hole into a V-shaped free surface; then drilling an inclined hole of 60 degrees, filling the static crushing agent, and sequentially crushing layer by layer; the purpose of drilling the 60-degree inclined hole is to enlarge the area of a free surface, form a larger space for containing the static crushing agent and improve the crushing effect.

When the object to be crushed is a reinforced concrete column, the static crushing method comprises the following steps: drilling a vertical hole at the top of the column, drilling uniformly distributed oblique holes at the column body part, and filling the static crushing agent into the vertical hole and the oblique holes for crushing;

when the thickness of the object to be crushed is more than 1m, the static crushing method comprises the following steps: drilling a horizontal hole 2-3 cm below a planned crushing surface, pouring the static crushing agent to perform pre-cracking, drilling a vertical hole at the top of the static crushing agent, and pouring the static crushing agent to perform comprehensive crushing.

Different crushing methods are used for different main bodies to be crushed, so that the crushed main bodies can be effectively cracked, the crushing rate is improved, and the crushing time is shortened.

Compared with the prior art, the invention has the advantages that:

(1) according to the static crushing agent disclosed by the invention, the fluorite powder is used for promoting the iron element in the raw material to be melted to form the liquid-phase wrapped calcium oxide clinker, the gypsum and the organic retarder are used for adjusting the condensation time of the calcium oxide clinker, and the powder water reducing agent is used for adjusting the hole filling flowing state of the static crushing agent after water is added into the static crushing agent.

(2) According to the static crushing agent disclosed by the invention, the fluorite powder is introduced into the raw material, so that the calcining temperature can be reduced, the viscosity of a liquid phase of the clinker during calcining can be increased, the iron element in the raw material is promoted to be melted to form a liquid phase to wrap the calcium oxide clinker, and the hydration reaction time of the clinker is controlled, so that the ineffective expansion of the calcium oxide in a plastic stage during the reaction with water is reduced.

(3) In the preparation method of the static crushing agent, the calcium carbonate in the raw material is decomposed in advance through pre-decomposition, so that the production efficiency of the calcium oxide clinker is improved, the high-temperature calcination time of the raw material in a rotary kiln is shortened, the quality of the calcium oxide clinker is improved, and the productivity and the yield are improved.

(3) In the crushing method, different crushing methods are used for different main bodies to be crushed, so that the crushed main bodies can be effectively cracked, the crushing rate is improved, and the crushing time is shortened.

Drawings

FIG. 1 is a schematic diagram of a hole layout design for multiple rows of holes;

FIG. 2 is a schematic view of a hole arrangement of unreinforced concrete;

FIG. 3 is a schematic illustration of the borehole of FIG. 2 after cracking;

FIG. 4 is a schematic view showing the arrangement of holes for crushing the reinforced concrete protective layer;

FIG. 5 is a schematic view of the hole distribution of the crushed reinforced concrete;

FIG. 6 is a schematic view of a hole arrangement of a broken reinforced concrete slab structure;

FIG. 7 is a cross-sectional view of FIG. 6;

FIG. 8 is a schematic view showing the arrangement of holes for crushing reinforced concrete columns;

fig. 9 is a top view of fig. 8.

Wherein: 1. drilling; 2. reinforcing steel bars, 3 and auxiliary holes; 4. an inclined hole of 60 degrees; 5. a vertical hole; 6. and (4) an oblique hole.

Detailed Description

The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The sulfuric acid sludge in the following examples and comparative examples was obtained from Hubei Jingmen mineral products. The sulfur content of the gypsum is 35-46%, and the content of crystal water is 10-20%; the powder water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 20 percent; the organic retarder is sodium gluconate with sodium gluconate content higher than 80%, chloride content lower than 0.05%, and sulfate

Calculated) is less than 0.05 percent. The reduced matter is less than 0.5 percent, and the drying weight loss is less than 1.9 percent.

Example 1

The embodiment provides a static crushing agent, which comprises the following raw materials in percentage by mass: 90% of calcium oxide clinker, 9.5% of gypsum, 0.2% of powder water reducing agent and 0.3% of organic retarder;

the calcium oxide clinker is prepared by calcining a mixed raw material consisting of 96 parts by weight of limestone, 4 parts by weight of sulfuric acid residue and 0.6 part by weight of fluorite powder at high temperature; the fineness of the residue of the 0.08mm square-hole sieve of the calcium oxide clinker is 9 percent.

The preparation method of the static cracking agent of the embodiment comprises the following steps:

s1, mixing the limestone, the sulfuric acid slag and the fluorite powder, adding the mixture into a ball mill for grinding, and sieving the ground mixture through a 0.08mm square-hole sieve to obtain a mixed raw material with the residual fineness of 12%;

s2, lifting the mixed raw material obtained in the step S1 to a five-stage decomposing furnace by using a lifter for pre-decomposition, wherein the initial pre-decomposition temperature is 450 ℃, the pre-decomposition temperature of each stage is increased by 100 ℃, the pre-decomposition temperature of the last stage is 850 ℃, and the pre-decomposition time of each stage is 25 min;

s3, conveying the raw material pre-decomposed in the step S2 into a rotary kiln through a conveyor belt for high-temperature calcination, controlling the highest temperature in a kiln body calcination zone at 1250 ℃ and controlling the rotating speed of the rotary kiln at 3r/min to obtain calcium oxide clinker;

s4, adding the calcium oxide clinker obtained in the step S3 into a ball mill for grinding and sieving, wherein the fineness of the residue on a 0.08mm square-hole sieve is 9%; and adding the mixture, gypsum, a powder water reducing agent and an organic retarder into a mixer, mixing for 8min, adding the mixture into a dry powder mixer, mixing for 12min, and mixing to obtain the static breaking agent.

The cubic liter weight of the calcium oxide clinker in the embodiment is 1450g/L, and the content of f-CaO is 73%; the sulfur content of gypsum is 39%, and the content of crystal water is 15%; the powder water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 23%; the organic retarder is sodium gluconate with sodium gluconate content of 85%, chloride content of 0.02%, and sulfate content

Calculated) was 0.03%. The reduced product was 0.3%, and the loss on drying was 1.4%.

Example 2

Example 2 is essentially the same as example 1, except that: the static crushing agent of the embodiment comprises the following raw materials in percentage by mass: 94.5 percent of calcium oxide clinker, 5 percent of gypsum, 0.2 percent of powder water reducing agent and 0.3 percent of organic retarder.

Example 3

Example 3 is essentially the same as example 1, except that: the static crushing agent of the embodiment comprises the following raw materials in percentage by mass: 90% of calcium oxide clinker, 9.5% of gypsum, 0.1% of powder water reducing agent and 0.4% of organic retarder.

Comparative example 1

Comparative example 1 is substantially the same as example 1 except that the static breaking agent of this comparative example comprises the following raw materials in mass percent: 80% of calcium oxide clinker, 19.5% of gypsum, 0.2% of powder water reducing agent and 0.3% of organic retarder.

Comparative example 2

Comparative example 2 is substantially the same as example 1 except that the static breaking agent of this comparative example comprises the following raw materials in mass percent: 94.5 percent of calcium oxide clinker, 3 percent of gypsum, 0.1 percent of powder water reducing agent and 2.4 percent of organic retarder.

Comparative example 3

Comparative example 3 is substantially the same as example 1 except that the static breaking agent of this comparative example comprises the following raw materials in mass percent: 90% of calcium oxide clinker, 9.5% of gypsum and 0.5% of organic retarder.

That is, compared with example 1, the raw material of the static crusher of the present comparative example does not contain the powder water reducing agent.

Comparative example 4

Comparative example 4 is substantially the same as example 1 except that the calcium oxide clinker of this comparative example is obtained by high-temperature calcination of a mixed raw material composed of 96 parts by weight of limestone and 4 parts by weight of sulfuric acid residue; the fineness of the residue of the 0.08mm square-hole sieve of the calcium oxide clinker is 9 percent.

That is, in comparison with example 1, the mixed raw material of the static cracking agent of the present comparative example does not contain fluorite powder.

Comparative example 5

Comparative example 5 is substantially the same as example 1 except that the static crushing agent of this comparative example is prepared by omitting step S2 and the mixed raw meal is directly subjected to high-temperature calcination without preliminary decomposition treatment.

Test examples

The static breakers of the examples and comparative examples of the present invention were mixed with water at a water-to-material ratio of 0.28, and tested for setting time, fluidity and inflation pressure according to the regulations relating to JC506-2008, Silent breaker, and the test results are shown in Table 1.

TABLE 1

From the above test experiment results, it can be seen that: each index of the static cracking agent of the embodiment 1-3 of the invention meets the requirement of type I products in a standard JC506-2008 'Silent cracking agent' on the superior products. The static breaker of example 2 is the most effective. As can be seen by comparing example 1 with comparative example 1, comparative example 1 decreases the amount of clinker of calcium oxide, and increases the amount of gypsum accordingly, resulting in an increase in setting time and a decrease in expansion pressure; comparing example 3 with comparative example 2, it can be seen that comparative example 2 reduces the dosage of gypsum and correspondingly increases the dosage of organic retarder, the dosage of organic retarder is too high, the reaction time of calcium oxide clinker is seriously inhibited, the setting time is remarkably prolonged, and the expansion pressure is remarkably reduced; as can be seen from the comparison of example 1 and comparative example 3, comparative example 3 lacks a water reducing agent, and the dosage of the organic retarder is correspondingly increased, so that the fluidity of the slurry is deteriorated, the filling property is reduced, the compactness of the slurry is reduced, the effective amount actually filled is reduced, and further the expansion pressure is reduced. As can be seen by comparing the example 1 with the comparative example 4, the comparative example 4 lacks fluorite powder, the liquid phase wrapping the calcium oxide clinker is reduced, the liquid phase wrapping of the clinker is insufficient, the calcium oxide clinker generates hydration reaction in the plastic stage, the setting time is advanced, and the expansion pressure is obviously reduced within 24 hours and 48 hours; as can be seen from comparison between example 1 and comparative example 5, the mixed raw material of comparative example 5 was directly calcined without undergoing the pre-decomposition treatment, and the limestone which had not undergone the pre-decomposition treatment was not sufficiently decomposed and was not favorable for forming a liquid phase, resulting in a high proportion of the undecomposed limestone remaining in the clinker, a decrease in the proportion of the produced clinker, and a significant decrease in the expansion pressure thereof.

Therefore, the dosage of each component of the static crushing agent can only effectively play a role within the scope of the invention, and the too high or too low of the static crushing agent has certain influence on the common performance of the static crushing agent and even mutual restriction, so that the reasonable dosage of the components of the actual product should be strictly controlled.

Example 4

The embodiment provides a static crushing method, wherein an object to be crushed is a concrete foundation bearing platform, the thickness of the object to be crushed is 1.5m, and the length and the width of the object to be crushed are both 2m, and the method comprises the following steps of:

and P1, hole distribution design, which comprises the following steps: (1) before crushing design, finding out an original design drawing, and finding that crushed objects have reinforcing steel bars, wherein the diameter of the reinforcing steel bars is 14mm, and the distance between the reinforcing steel bars is 200 mm; (2) determining a minimum resistance line W (the shortest distance from the center of the drill hole 1 to the nearest free surface), wherein the W is 25 cm; (3) determining the pitch and the row pitch b, wherein a is 30cm, and b is 18 cm; (4) determining the aperture phi of the drill hole 1, wherein the aperture phi is 30 mm; (5) determining the hole depth L of the drill hole 1, wherein the hole depth L is 1.4 m; (6) determining the direction of a drilling hole 1, wherein the drilling direction is mainly vertical; FIG. 1 is a schematic diagram of a multiple row hole layout design;

p3, mixing the static crushing agent of the example 2 with water, wherein the mass ratio of the water to the static crushing agent is 0.28; then pouring the mixture of the static crushing agent and water into the drill hole;

and P4, a first crack appears after the hole is filled for 5 hours, a plurality of small cracks which develop along the drilling direction appear after 8 hours, the cracks develop to the width of more than or equal to 10mm after 24 hours, and the concrete foundation can be statically dismantled through external equipment such as a pneumatic pick.

Aiming at different main bodies to be crushed, different crushing methods are used, and the method comprises the following specific steps:

when the main body to be crushed is unreinforced concrete, the static crushing method comprises the following steps: layering or blocking and crushing (as shown in figures 2-3); fig. 2 is a schematic diagram of hole arrangement of unreinforced concrete, which is a schematic diagram of hole arrangement of layered crushing, small crushing and layered crushing from left to right in sequence, and fig. 3 is a schematic diagram of a cracked drill hole 1 in fig. 2;

when the main body to be crushed is reinforced concrete, the static crushing method comprises the following steps: arranging holes on the inner layer close to the steel bars 2, wherein the hole distance is 15-25 mm, firstly, expanding and cracking the concrete protective layer, cutting off the horizontal steel bars after the steel bars 2 are exposed, and drilling and crushing in the middle after the stirrup is removed (as shown in figures 4-5); d in fig. 4 represents a protective layer;

when the main body to be crushed is a reinforced concrete flat plate structure, the static crushing method comprises the following steps: drilling an auxiliary hole 3 in the center of the plate, filling the static crushing agent, and crushing the plate into a V-shaped free surface; then drilling an inclined hole 4 with the angle of 60 degrees, and pouring the static crushing agent, and sequentially crushing layer by layer (as shown in figures 6-7); the effect of boring the inclined hole is to form bigger free surface, forms bigger space and holds static breaker, improves crushing efficiency.

When the main body to be crushed is a reinforced concrete column, the static crushing method comprises the following steps: if a free surface exists at the top end of the column, drilling a vertical hole 5 at the top of the column, drilling uniformly distributed oblique holes 6 at the column body part, and filling the static crushing agent into the vertical hole 5 and the oblique holes 6 for crushing; if the top end of the column has no free surface, drilling uniformly distributed oblique holes 6 on the same side surface of the column body part, and filling the static crushing agent into the oblique holes 6 for crushing (as shown in figures 8-9);

when the thickness of the main body to be crushed is more than 1m, the static crushing method comprises the following steps: drilling a horizontal hole 2-3 cm below a planned crushing surface, pouring the static crushing agent to perform pre-cracking, drilling a vertical hole at the top of the static crushing agent, and pouring the static crushing agent to perform comprehensive crushing.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The static crushing agent is characterized by comprising the following raw materials in percentage by mass: 90-94.5% of calcium oxide clinker, 5-9.5% of gypsum, 0.1-0.3% of powder water reducer and 0.3-0.5% of organic retarder;

the calcium oxide clinker is prepared by calcining a mixed raw material consisting of 94-97 parts by weight of limestone, 3-5 parts by weight of sulfuric acid residue and 0.5-1 part by weight of fluorite powder at a high temperature.

2. The static crusher as claimed in claim 1, wherein the fineness of 0.08mm square mesh screen of the calcium oxide clinker is less than or equal to 10%.

3. The static crusher as claimed in claim 1, wherein the clinker has a weight per liter of 1400 to 1500g/L and a f-CaO content of 68 to 75 wt%.

4. The static crusher of claim 1 wherein the organic retarder comprises at least one of sodium gluconate, tartaric acid, salicylic acid, triethanolamine or methylcellulose.

5. A method for preparing a static crusher as claimed in any of claims 1 to 4, characterized in that it comprises the following steps:

6. A static crushing method using the static crusher as claimed in any one of claims 1 to 4, characterized by comprising the steps of:

p1, designing holes;

p3, mixing the static crushing agent with water, and then filling the mixture of the static crushing agent and the water into the drill hole;

7. The static crushing method of claim 6, wherein in the step P3, the mass ratio of the water to the static crushing agent is (0.26-0.30): 1.

8. The static crushing method of claim 6,

when the object to be crushed is unreinforced concrete, the static crushing method comprises the following steps: layering or blocking and crushing;

when the object to be crushed is reinforced concrete, the static crushing method comprises the following steps: arranging holes on the inner layer close to the steel bars, wherein the hole distance is 15-25 mm, firstly, expanding and cracking the concrete protective layer, cutting off the horizontal steel bars after the steel bars are exposed, and drilling and crushing in the middle after the restraint of the stirrups is relieved;

when the object to be crushed is a reinforced concrete flat plate structure, the static crushing method comprises the following steps: drilling an auxiliary hole in the center of the plate, and filling the static crushing agent into the auxiliary hole to crush the auxiliary hole into a V-shaped free surface; then drilling an inclined hole of 60 degrees, filling the static crushing agent, and sequentially crushing layer by layer;