Method for compounding and using grouting material suitable for fully prefabricated bridge connection

Abstract

The present invention relates to the technical field of grouting materials. Provided is a method for compounding and using a grouting material suitable for fully prefabricated bridge connection. The method comprises the steps of raw material preparation, dry mixture preparation, solution preparation, grouting material preparation, grouting material storage, component mounting, grouting construction, etc. The present invention uses a quick-hardening grouting material, which has a short setting time and can quickly reach design strength, thereby greatly shortening the construction period and improving the construction efficiency.

Description

Grouting material compounding and using method suitable for full assembly type bridge connection TECHNICAL FIELD

[0001] The present application relates to the technical field of grouting material, and particularly relates to a grouting material compounding and using method suitable for full assembly type bridge connection. BACKGROUND

[0002] In the field of civil engineering, bridge construction is an important engineering project, and the quality of bridge connection directly affects the overall stability and safety of the bridge. Traditional bridge connection methods usually use welding or bolt connection, but these methods have long construction periods, have a large impact on the environment, and may not meet the requirements in some special situations (such as earthquakes). In the field of building materials, grouting material is a commonly used connecting material that can connect different building components together through grouting, and has the advantages of simple construction, high connection strength, and good durability. However, the setting time of ordinary grouting material is relatively long, generally requiring several hours or even several days, which cannot meet the requirements in some emergency situations (such as emergency repair after an earthquake). In the field of chemical engineering, fast-hardening grouting material is a new type of grouting material, which has the characteristics of short setting time and can quickly reach the design strength, thereby shortening the construction period and improving the construction efficiency. However, the preparation and application technology of fast-hardening grouting material is not mature enough, and its performance needs to be further optimized. SUMMARY

[0003] In view of the above prior art, the present application provides a grouting material compounding and using method suitable for full assembly type bridge connection.

[0004] The grouting material compounding and using method suitable for full assembly type bridge connection provided by the present application comprises the following steps:

[0005] Step 1: raw material preparation: prepare cement, mineral admixture, quartz sand, and expanding agent, and the mass ratio of each raw material is: cement: mineral admixture: quartz sand: expanding agent = 1:0.2:1.5:0.08;

[0006] Step 2: dry mixture preparation: mix the cement, mineral admixture, quartz sand, and expanding agent, and stir at a speed of 60 r / min for 10 min to obtain a dry mixture;

[0007] Step 3: solution material preparation: stir the mixed water, water reducing agent, and defoaming agent according to a mass ratio of 1:0.01:0.005 to form a solution material;

[0008] Step 4: preparation of grouting material: the dry mixture is mixed with the solution material to obtain a mixture by stirring at a speed of 60 r / min for 10 min, and the chopped steel fiber is added to the mixture at a mass ratio of 0.05:1, and the stirring is continued for 2 min to obtain the grouting material;

[0009] Step 5: storage of grouting material: when the grouting material is stored, it is kept dry, ventilated and sun-protected;

[0010] Step 6: component installation: before the component installation, the grouting sleeve is fixed on the mold, and the grouting sleeve is reliably sealed;

[0011] Step 7: grouting construction: when the grouting construction is carried out, the environmental temperature is between 5℃ and 40℃, the grouting material is first loaded into a pressure tank, then an air compressor is started to deliver air from an air pipe to the pressure tank containing the grouting material, so that the pressure of the pressure tank increases, and the grouting material in the pressure tank is pressed out under the action of the internal pressure and enters the grouting sleeve through the conduit.

[0012] Preferably, in step 1, the cement is selected from P•O42.5 grade ordinary portland cement.

[0013] Preferably, in step 1, the mineral admixture is selected from S95 grade slag powder.

[0014] Preferably, in step 1, the quartz sand is selected from 70-140 mesh continuous gradation.

[0015] Preferably, in step 1, the expansive agent is selected from calcium sulphoaluminate type expansive agent.

[0016] Preferably, in step 7, when the vertical steel sleeve is grouted by using the communicating cavity, the pressure grouting method is used to inject from the grouting hole at the bottom of the grouting sleeve, and the grouting hole is sealed in time after the grouting material flows out from other grouting holes and the grouting hole of the component.

[0017] Preferably, in step 7, when the horizontal steel sleeve is connected, the grouting operation is carried out by using the pressure grouting method to inject from the grouting hole of the grouting sleeve, and the grouting is stopped when the grouting material at the connecting pipe or connecting head of the grouting hole and the grouting hole of the grouting sleeve is higher than the highest point of the outer surface of the grouting sleeve, and the grouting hole and the grouting hole are sealed.

[0018] The cement, mineral admixture, quartz sand, expansive agent and other raw materials in specific proportions are used in the application, the rheological, mechanical and expansion properties of the grouting material are optimized by the orthogonal experiment method, and the final optimized mixing ratio is obtained, so that the setting time of the grouting material is shortened, and the connection strength and durability are improved.

[0019] In order to realize the accurate regulation of the performance of the grouting material, the present application adopts an innovative method, that is, the proportion of cement, mineral admixture, quartz sand and expansive agent and other raw materials is optimized through orthogonal experiment. In the orthogonal experiment, multiple factors and levels are selected, through the comparative analysis of multiple groups of experiments, a specific raw material ratio is found, that is, cement: mineral admixture: quartz sand: expansive agent = 1:0.2:1.5:0.08, which can significantly improve the rheological property of the grouting material, so that it has better workability in the construction process.

[0020] In addition, the mechanical properties of the grouting material are also optimized through orthogonal experiment. By adjusting the proportion of raw materials, the compressive strength and flexural strength of the grouting material are successfully improved, so that it can meet the higher requirements of engineering application. At the same time, the influence of different raw material proportions on the expansion performance of the grouting material is also studied, and the micro-expansion of the grouting material is realized by controlling the amount of expansive agent, which helps to improve the connection strength of the grouting material and the concrete structure.

[0021] It is worth noting that the present application also studies the influence of different raw material proportions on the setting time of the grouting material through orthogonal experiment. By optimizing the raw material ratio, the setting time of the grouting material is successfully shortened, so that it is more efficient in the construction process. This innovative research result not only improves the connection strength and durability of the grouting material, but also improves the construction efficiency.

[0022] In addition, the present application adopts a special compounding process, first, the cement, mineral admixture, quartz sand, expansive agent are put into the stirring pot to stir to obtain the dry mixture of the grouting material, at the same time, the mixing water, water reducing agent and defoaming agent are stirred to form a solution, then the two are mixed, continuously stirred, finally 1 min continuously adds the chopped steel fiber to obtain the fast hardening type grouting material. This compounding process can effectively reduce the dust generated in the preparation process of the grouting material, and has little influence on the environment and human health.

[0023] In order to improve the preparation efficiency and environmental performance of the grouting material, an innovative compounding process is developed. First, the dry raw materials such as cement, mineral admixture, quartz sand and expansive agent are put into a special stirring pot for sufficient stirring to form a dry mixture. The key of this step is to adopt high-precision stirring technology to ensure the uniform mixing of raw materials. At the same time, a defoaming agent solution is specially designed, which is mixed by mixing water, water reducing agent and defoaming agent. The addition of this defoaming agent solution can significantly reduce the dust generated in the preparation process of the grouting material, thereby reducing the harm to the environment and human health.

[0024] Next, the dry mixture is mixed with the defoaming agent solution, ensuring the two materials are fully combined by continuous stirring. During this process, high-efficiency stirring technology is used to ensure the uniformity and stability of the mixture. Finally, chopped steel fibers are continuously added during the last minute of stirring, which not only enhances the mechanical properties of the grouting material but also improves its durability and crack resistance.

[0025] Through this innovative compounding process, the invention successfully realizes the green preparation of grouting material, significantly reducing dust pollution, while improving the performance of grouting material. This research result provides an environmentally friendly and efficient new way for the industrial production and application of grouting material.

[0026] In addition, during the construction process, the invention adopts specific storage, installation and grouting construction procedures to ensure the quality and performance of the grouting material, while also improving construction efficiency and reducing construction costs. For example, when storing the grouting material, it should be dried, ventilated and protected from the sun to prevent moisture absorption and performance changes. Before installing the component, the grouting sleeve is fixed to the mold through rubber rings, screws and other fixing devices, and the grouting sleeve is reliably sealed. During grouting construction, the ambient temperature should meet certain requirements, and a full-time testing personnel should be responsible for on-site supervision and timely formation of construction inspection records.

[0027] To ensure the quality and performance of the grouting material during the construction process, as well as to improve construction efficiency and reduce costs, the invention uses a series of innovative technical means. First, in terms of grouting material storage, a special storage container with drying and ventilation functions can be designed, and ultraviolet protection measures can be taken to prevent moisture absorption and performance degradation of the grouting material. This innovative storage method can ensure the stability of the grouting material and extend its service life.

[0028] Secondly, during the installation of the component, the grouting sleeve is designed to be integrated with the mold, and through special fixing methods, the stability and reliability of the grouting sleeve are ensured. A new grouting sleeve sealing technology has also been developed, effectively preventing grout leakage during grouting.

[0029] In terms of grouting construction, the invention proposes an environmental temperature control method to ensure that the construction environment is within an appropriate temperature range to ensure the performance of the grouting material and the construction effect. At the same time, a full-time testing personnel is responsible for on-site supervision to ensure that the entire grouting operation process is strictly controlled. In addition, intelligent grouting equipment is introduced innovatively to achieve accurate control of the grouting amount and automation of the construction process, greatly improving the construction efficiency.

[0030] In summary, this invention, through innovative storage, installation, and grouting processes, ensures the quality and performance of the grouting material while improving construction efficiency and reducing construction costs. These research findings provide strong technical support for the efficient and high-quality construction of grouting materials in engineering applications.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. This invention uses a fast-setting grout, which has a short setting time and can quickly reach the design strength, greatly shortening the construction cycle, improving construction efficiency, and meeting the needs of emergency situations (such as emergency repairs after an earthquake).

[0033] 2. During grouting construction, the present invention strictly controls environmental conditions such as temperature and humidity, ensuring the stability of the grouting material's performance and avoiding connection quality problems caused by environmental factors.

[0034] 3. In the grouting construction, the present invention uses the pressure grouting method, which can make the grouting material fill the grouting sleeve more evenly and improve the reliability of the connection.

[0035] 4. This invention strictly controls the use and management of grouting materials during grouting construction, avoiding the generation of a large amount of dust during the preparation of grouting materials and reducing the impact on the environment and human health. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments.

[0037] Example: A method for preparing and using grouting material suitable for connections in fully prefabricated bridges, comprising the following steps:

[0038] Step 1: Raw material preparation: Prepare cement, mineral admixtures, quartz sand, and expanding agent. The cement used is P•O42.5 grade ordinary Portland cement, the mineral admixture is S95 grade slag powder, the quartz sand is 70-140 mesh continuously graded, and the expanding agent is calcium sulfoaluminate expanding agent. The mass ratio of each raw material is: cement:mineral admixtures:quartz sand:expanding agent = 1:0.2:1.5:0.08;

[0039] Step 2: Dry Mix Preparation: Place cement, mineral admixtures, quartz sand, and expansion agent into a mixing pot and mix at 60 r / min for 10 min to obtain dry mix;

[0040] Step 3: Solution preparation: Mix water, water-reducing agent and defoamer at a mass ratio of 1:0.01:0.005 to form a solution;

[0041] Step 4: preparation of grouting material: the dry mixture is mixed with the solution material at a speed of 60 r / min for 10 min to obtain a mixture, and the chopped steel fiber is added to the mixture at a mass ratio of 0.05:1, and the stirring is continued for 2 min to obtain the grouting material;

[0042] Step 5: storage of grouting material: when the grouting material is stored, it is kept dry, ventilated, and sun-protected to prevent moisture absorption and performance change;

[0043] Step 6: component installation: before the component installation, the grouting sleeve is fixed on the mold, and the grouting sleeve is reliably sealed;

[0044] Step 7: grouting construction: during the grouting construction, the ambient temperature is 25℃, a full-time inspection personnel is responsible for the on-site supervision during the whole process of the grouting operation, and the construction inspection record is timely formed, the grouting material is first loaded into the pressure tank, then the air compressor is started to transmit the air from the air pipe to the pressure tank loaded with the grouting material, so that the pressure of the pressure tank is increased, the grouting material in the pressure tank is pressed out under the action of the internal pressure, and the grouting material is introduced into the grouting sleeve through the pipeline; when the vertical steel sleeve is grouted by using the communication cavity grouting, the pressure grouting method is used to inject from the grouting hole at the bottom of the grouting sleeve, and the grouting hole is timely sealed after the grouting material flows out from other grouting holes and the grouting hole of the component; when the horizontal steel sleeve is connected, the pressure grouting method is used to inject from the grouting hole of the grouting sleeve, and the grouting is stopped when the grouting material at the connecting pipe or the connecting head of the grouting hole and the grouting hole of the grouting sleeve is higher than the highest point of the outer surface of the grouting sleeve, and the grouting hole and the grouting hole are sealed.

[0045] In the field of civil engineering, the fast-hardening grouting material can greatly improve the efficiency and quality of bridge connection, shorten the construction period, and improve the stability and safety of the bridge. In the field of building materials, the fast-hardening grouting material can provide a new connection method, which has the advantages of simple construction, high connection strength, good durability, etc., and can be widely used in the connection of various building structures. In the field of chemical engineering, the preparation and application technology of the fast-hardening grouting material can provide new ideas and methods for the development of this field. At the same time, due to the advantages of rapid setting, high strength, environmental protection, etc. of the fast-hardening grouting material, it has a broad application prospect in the fields of emergency repair, rapid construction, high environmental protection requirements, etc.

[0046] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent scheme using the content of the present application specification, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A method for compounding and using grout suitable for full-assembly bridge connection, characterized in that, It comprises the following steps: Step 1: raw material preparation: prepare cement, mineral admixture, quartz sand, expanding agent, and the mass ratio of each raw material is: cement: mineral admixture: quartz sand: expanding agent = 1:0.2:1.5:0.08; Step 2: dry mixture preparation: mix cement, mineral admixture, quartz sand and expanding agent, stir at a speed of 60r / min for 10min to obtain dry mixture; Step 3: solution preparation: mix water, water reducing agent and defoaming agent according to the mass ratio of 1:0.01:0.005 to form a solution; Step 4: grouting material preparation: mix the dry mixture with the solution, stir at a speed of 60r / min for 10min to obtain a mixture, add chopped steel fiber to the mixture according to the mass ratio of 0.05:1, continue to stir for 2min to obtain the grouting material; Step 5: grouting material storage: keep dry, ventilated and take sun protection measures when storing the grouting material; Step 6: component installation: before component installation, fix the grouting sleeve on the mold and reliably seal the grouting sleeve; Step 7: grouting construction: when the grouting construction is carried out, the environmental temperature is between 5℃-40℃, first put the grouting material into the pressure tank, then start the air compressor to send air from the air pipe to the pressure tank containing the grouting material, so that the pressure of the pressure tank increases, the grouting material in the pressure tank is pressed out under the action of internal pressure, and enters the grouting sleeve through the pipe.

2. The method of claim 1, wherein the method is used for the full assembly bridge connection. In step 1, the cement selected is P•O42.5 grade ordinary portland cement.

3. The method for compounding and using the grout material for the full assembled bridge connection according to claim 1 or 2, characterized in that, In step 1, the mineral admixture selected is S95 grade slag powder.

4. The method of claim 1 or 2, wherein the grout composition is used for the full- assembled bridge connection. In step 1, the quartz sand selected is 70-140 mesh continuous gradation.

5. The method of claim 1 or 2, wherein the grout composition is used for the full- assembled bridge connection. In step 1, the expanding agent selected is calcium sulphoaluminate type expanding agent.

6. The method of claim 1 or 2, wherein the grout composition is used for the full- assembled bridge connection. In step 7, when the vertical steel sleeve is grouted by communicating cavity, the pressure grouting method is used to inject from the grouting hole at the bottom of the grouting sleeve, and the grouting hole and the outlet hole are sealed in time after the grouting material flows out from other grouting holes of the component.

7. The method of claim 1 or 2, wherein the method is used for the full assembly bridge connection. In step 7, when the horizontal steel sleeve is connected, the grouting operation adopts the pressure grouting method to inject from the grouting hole of the grouting sleeve, and the grouting is stopped when the grouting material at the connecting pipe or connecting head of the grouting hole and outlet hole of the grouting sleeve is higher than the highest point of the outer surface of the grouting sleeve, and the grouting hole and outlet hole are sealed.