A high-admixture accelerator cement paste preparation system and a grouting method

Abstract

The application discloses a high-doped accelerator cement neat paste preparation system and a grouting method, and relates to the field of cement preparation systems, which comprises a high-speed paste preparation machine and an automatic recorder, wherein one end of the high-speed paste preparation machine is connected with a raw material station for feeding; a first paste supply pump is arranged at a discharge port of the high-speed paste preparation machine; the first paste supply pump is connected with a first paste storage barrel through a first paste feeding pipe; the first paste storage barrel is connected with a first grouting pump through a pipeline at an outlet end; the first grouting pump is connected with a first paste feeding branch pipe at an outlet end; the first paste feeding branch pipe is connected with a paste feeding main pipe and a second paste feeding branch pipe through a three-way valve; the paste feeding main pipe is connected with a sleeve valve pipe; the second paste feeding branch pipe is connected with an outlet end of a second grouting pump; an inlet end of the second grouting pump is connected with an outlet end of a second paste storage barrel through a pipeline; an inlet end of the second paste storage barrel is connected with a second paste supply pump through a second paste feeding pipe; and the second paste supply pump is connected with water glass at an inlet end. The two sets of grouting systems are used for realizing online mixing, so that the cement can be quickly coagulated, and the grouting effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of municipal engineering technology, specifically relating to a cement paste preparation system with high admixture of accelerator and a grouting preparation method. Background Technology

[0002] Currently, municipal roads are increasingly prone to subsidence and collapse due to factors such as groundwater erosion, long-term disrepair of underground pipe networks leading to leakage and erosion of the foundation, and the presence of cavities in the subgrade. Conventional solutions include open-cut replacement or grouting to fill the eroded areas. However, open-cut replacement is time-consuming, requires a large area, and is costly, making it unsuitable for repairing main roads with high traffic volume. Grouting, on the other hand, suffers from poor grouting results due to the long setting time, which can lead to grout diffusion and blockages in surrounding pipe trenches. Furthermore, grouting is ineffective in areas with high groundwater levels, failing to achieve precise repair results. Therefore, it is necessary to design a cement grout preparation system with high accelerator content and a grouting method to address these issues. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a cement paste preparation system and grouting method with high admixture of quick-setting agent. This solution solves the problems of existing grouting technology, which suffers from long grout setting time, resulting in increased grout diffusion range and blockage in surrounding pipe trenches, poor grouting effect in areas with high groundwater levels, and difficulty in achieving precise repair. This solution has the feature of online mixing through two grouting systems, thereby achieving rapid setting and improving grouting effect.

[0004] To achieve the above design, the technical solution adopted by the present invention is as follows: a cement paste preparation system with high admixture of accelerator, comprising a high-speed paste mixer and an automatic recorder. One end of the high-speed paste mixer is connected to a raw material station for feeding. A first slurry pump is provided at the discharge port of the high-speed paste mixer. The first slurry pump is connected to a first slurry storage tank through a first slurry delivery pipe. The outlet end of the first slurry storage tank is connected to a first grouting pump through a pipeline. The outlet end of the first grouting pump is connected to a first slurry inlet branch pipe. The first slurry inlet branch pipe is connected to a main slurry inlet pipe and a second slurry inlet branch pipe through a three-way valve. The main slurry inlet pipe is connected to a sleeve valve pipe. The second slurry inlet branch pipe is connected to the outlet end of a second grouting pump. The inlet end of the second grouting pump is connected to the outlet end of the second slurry storage tank through a pipeline. The inlet end of the second slurry storage tank is connected to the second slurry pump through a second slurry delivery pipe. The inlet end of the second slurry pump is connected to water glass.

[0005] Preferably, a first density sensor and a first grout flow sensor are connected to the pipeline between the first grout storage tank and the first grouting pump, and the first density sensor and the first grout flow sensor are electrically connected to the automatic recorder.

[0006] Preferably, a first pressure gauge and a first pressure sensor are connected between the first slurry inlet branch pipe and the three-way valve, and the first pressure sensor is electrically connected to the automatic recorder.

[0007] Preferably, a control valve is provided at the front end of the second slurry inlet branch pipe.

[0008] Preferably, a second pressure gauge and a second pressure sensor are connected between the second grout inlet branch pipe and the second grouting pump, and the second pressure sensor is electrically connected to the automatic recorder.

[0009] Preferably, a second density sensor and a second grout flow sensor are connected to the pipeline between the second grouting pump and the second grout storage tank, and the second density sensor and the second grout flow sensor are electrically connected to the automatic recorder.

[0010] Preferably, both the first grouting pump and the second grouting pump are equipped with a speed controller.

[0011] Preferably, the above-mentioned method for preparing and grouting cement paste with high admixture of accelerator includes the following steps:

[0012] S1, Prepare raw materials to prepare reagent #1 and reagent #2 respectively:

[0013] Reagent #1 was prepared into a cement paste using P.O42.5 ordinary Portland cement at a water-cement ratio of 1:1, with a paste specific gravity of 1.50; Reagent #1 was stored in the first storage tank.

[0014] Reagent #2 is water glass with a modulus of 3.1-3.4 and a Baume degree of 400Be, and a slurry specific gravity of 1.38. It is mixed with reagent #1 and reagent #2 at a weight ratio of 1:1 to form a high-admixture accelerator cement paste with an initial setting time of only 45 seconds. Reagent #2 is stored in a second slurry storage tank.

[0015] S2, preparation by mixing:

[0016] The volume ratio was calculated by converting the mass ratio to volume ratio using a 1:1 ratio. Based on the specific gravity of slurry of reagent #1 to reagent #2 (1.50:1.38), the volume ratio was calculated to be 1.38:1.50. Two preparation systems were formed by the first and second grouting pumps to supply materials separately. The flow rates of reagent #1 and reagent #2 were adjusted by the speed controller on the grouting pumps according to the parameters of the automatic flow recorder, so that the flow rate ratio was controlled at 1.38:1.50.

[0017] S3, through the single-liquid plug at the orifice of the grouting hole, reagent #1 and reagent #2 are mixed at the orifice, and the mixture is pressed into the reinforced foundation through the sleeve valve tube;

[0018] S4, grouting is performed inside the hole through the sleeve valve pipe.

[0019] The beneficial effects of the above-mentioned high-admixture accelerator cement paste preparation system and grouting method are as follows:

[0020] This system achieves online mixing by setting up two grouting systems, thereby achieving rapid setting and improving the grouting effect. It solves the problems of existing grouting technology, such as long grout setting time leading to increased grout diffusion and blockage in surrounding pipe trenches, poor grouting effect in areas with high groundwater levels, and difficulty in achieving precise repair. It has the advantages of easy maintenance, easy construction, fast construction, wide application range, energy saving and environmental protection. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the sleeve valve tube in Embodiment 2 of the present invention;

[0023] The attached diagram is labeled as follows: high-speed pulping machine 1, raw material station 11, sleeve valve pipe 12, second pulp delivery pipe 13, second pulp supply pump 14, water glass 15, control valve 16, first pulp supply pump 21, first pulp delivery pipe 22, first pulp storage tank 23, first grouting pump 24, first pulp inlet branch pipe 25, three-way valve 26, main pulp inlet pipe 27, second pulp inlet branch pipe 28, second grouting pump 29, second pulp storage tank 30, first density sensor 31, first pulp inlet flow sensor 32, first pressure gauge 33, first pressure sensor 34, second pressure gauge 35, second pressure sensor 36, second density sensor 37, second pulp inlet flow sensor 38, and automatic recorder 4. Detailed Implementation

[0024] Example 1:

[0025] like Figure 1 A cement paste preparation system with high admixture of accelerator includes a high-speed paste mixer and an automatic recorder. One end of the high-speed paste mixer is connected to a raw material station for feeding. A first slurry pump is installed at the discharge port of the high-speed paste mixer. The first slurry pump is connected to a first slurry storage tank through a first slurry delivery pipe. The outlet end of the first slurry storage tank is connected to a first grouting pump through a pipeline. The outlet end of the first grouting pump is connected to a first slurry inlet branch pipe. The first slurry inlet branch pipe is connected to a main slurry inlet pipe and a second slurry inlet branch pipe through a three-way valve. The main slurry inlet pipe is connected to a sleeve valve pipe. The second slurry inlet branch pipe is connected to the outlet end of a second grouting pump. The inlet end of the second grouting pump is connected to the outlet end of the second slurry storage tank through a pipeline. The inlet end of the second slurry storage tank is connected to the second slurry pump through a second slurry delivery pipe. The inlet end of the second slurry pump is connected to water glass.

[0026] Preferably, a first density sensor and a first grout flow sensor are connected to the pipeline between the first grout storage tank and the first grouting pump, and the first density sensor and the first grout flow sensor are electrically connected to the automatic recorder.

[0027] Preferably, a first pressure gauge and a first pressure sensor are connected between the first slurry inlet branch pipe and the three-way valve, and the first pressure sensor is electrically connected to the automatic recorder.

[0028] Preferably, a control valve is provided at the front end of the second slurry inlet branch pipe.

[0029] Preferably, a second pressure gauge and a second pressure sensor are connected between the second grout inlet branch pipe and the second grouting pump, and the second pressure sensor is electrically connected to the automatic recorder.

[0030] Preferably, a second density sensor and a second grout flow sensor are connected to the pipeline between the second grouting pump and the second grout storage tank, and the second density sensor and the second grout flow sensor are electrically connected to the automatic recorder.

[0031] Preferably, both the first grouting pump and the second grouting pump are equipped with a speed controller.

[0032] Example 2:

[0033] like Figure 2 As shown, the above-mentioned method for preparing and grouting a high-accelerator cement paste preparation system includes the following steps:

[0034] S1, Prepare raw materials to prepare reagent #1 and reagent #2 respectively:

[0035] Reagent #1 was prepared into a cement paste using P.O42.5 ordinary Portland cement at a water-cement ratio of 1:1, with a paste specific gravity of 1.50; Reagent #1 was stored in the first storage tank.

[0036] Reagent #2 is water glass with a modulus of 3.1-3.4 and a Baume degree of 400Be, and a slurry specific gravity of 1.38. It is mixed with reagent #1 and reagent #2 at a weight ratio of 1:1 to form a high-admixture accelerator cement paste with an initial setting time of only 45 seconds. Reagent #2 is stored in a second slurry storage tank.

[0037] S2, preparation by mixing:

[0038] The volume ratio was calculated by converting the mass ratio to volume ratio using a 1:1 ratio. Based on the specific gravity of slurry of reagent #1 to reagent #2 (1.50:1.38), the volume ratio was calculated to be 1.38:1.50. Two preparation systems were formed by the first and second grouting pumps to supply materials separately. The flow rates of reagent #1 and reagent #2 were adjusted by the speed controller on the grouting pumps according to the parameters of the automatic flow recorder, so that the flow rate ratio was controlled at 1.38:1.50.

[0039] S3, through the single-liquid plug at the orifice of the grouting hole, reagent #1 and reagent #2 are mixed at the orifice, and the mixture is pressed into the reinforced foundation through the sleeve valve tube;

[0040] S4, grouting is performed inside the hole through the sleeve valve pipe.

[0041] Furthermore, the structure of the sleeve valve tube is as follows: Figure 2 As shown, it consists of two parts: a perforated pipe with injection holes inside the grouting section and a solid pipe above the grouting section; a set of injection holes are opened at equal intervals on the perforated pipe, and the injection holes are arranged in a quincunx pattern, with a 5-8cm long rubber sleeve valve wrapped around the outer surface.

[0042] Example 3:

[0043] In practice, the construction process is as follows:

[0044] Step 1: Drill holes at 1.5m x 1.5m intervals at the subsidence location, with a hole depth of 6m and a hole diameter of 90mm. Pour casing material into the holes. Then insert a 50mm diameter sleeve valve pipe and seal the hole opening with grout.

[0045] Step 2: At the pulping station, P.O42.5 ordinary Portland cement is selected and cement paste is prepared at a water-cement ratio of 1:1. The paste is injected into the No.1 double-layer storage tank through the No.1 grouting pump. The No.1 density sensor is installed in the No.1 double-layer storage tank to check the specific gravity of the paste. The cement paste with a specific gravity of 1.50 is sent into the No.1 grouting pump. The No.1 grout flow sensor installed in the No.1 grouting pipe is used to monitor the grout flow rate. Simultaneously, water glass is injected into the No.2 double-layer storage tank through the No.2 grouting pump. The No.2 density sensor is installed in the No.2 double-layer storage tank to check the specific gravity of the paste. The water glass with a specific gravity of 1.38 is sent into the No.2 grouting pump. The No.2 grout flow sensor installed in the No.2 grouting pipe is used to monitor the grout flow rate.

[0046] Step 3: Install a 1# 3-way connector at the end of the 1# grouting branch pipe connected to the 1# grouting pump, and install a 2# 3-way connector at the end of the 2# grouting branch pipe connected to the 2# grouting pump. Connect the 1# and 2# 3-way connectors in parallel through the 1# control valve. Connect the outlet of the 2# 3-way connector to the 2# control valve for observing the water glass grout discharge and venting. Connect the main grouting pipe and insert the sleeve valve pipe at the outlet of the 1# 3-way connector.

[0047] Step 4: Before grouting, first close control valve #1 and open control valve #2. Then open grouting pumps #1 and #2. Control the flow ratio of grouting branch pipe #1 to grouting branch pipe #2 at 1.38:1.50 using the grout flow sensor and the speed controller installed on the grouting pump. Then close control valve #2 and open control valve #1. High-admixture accelerator cement slurry will be formed in the grouting main pipe at the outlet of the #1 3-way connector.

[0048] Step 5: Insert the main grouting pipe into the sleeve valve pipe. Through the double-layer piston-type grout stop plug in the sleeve valve pipe, achieve precise grouting in sections of 0.5m each. Through the fast-setting grout with an initial setting time of only 45 seconds, the soft soil foundation is quickly reinforced.

[0049] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The embodiments and features described in these embodiments can be arbitrarily combined without conflict. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for preparing and grouting a cement paste preparation system with high admixture of accelerator, the system comprising a high-speed paste mixer (1) and an automatic recorder (4), one end of the high-speed paste mixer (1) being connected to a raw material station (11) for feeding; characterized in that: The high-speed pulping machine (1) is equipped with a first pulp supply pump (21) at its discharge port. The first pulp supply pump (21) is connected to the first pulp storage tank (23) via a first pulp delivery pipe (22). The outlet end of the first pulp storage tank (23) is connected to the first grouting pump (24) via a pipeline. The outlet end of the first grouting pump (24) is connected to a first inlet branch pipe (25). The first inlet branch pipe (25) is connected to the main inlet pipe (27) and the second inlet branch pipe (28) via a three-way valve (26). The main inlet pipe (27) is connected to the first inlet branch pipe (28). 7) Connected to the sleeve valve pipe (12); the second grout inlet branch pipe (28) is connected to the outlet end of the second grouting pump (29), and the inlet end of the second grouting pump (29) is connected to the outlet end of the second grout storage tank (30) through a pipeline; the inlet end of the second grout storage tank (30) is connected to the second grout supply pump (14) through the second grout delivery pipe (13), and the inlet end of the second grout supply pump (14) is connected to the water glass (15); both the first grouting pump (24) and the second grouting pump (29) are equipped with speed controllers; The method includes the following steps: S1, Prepare raw materials to prepare reagent #1 and reagent #2 respectively: Reagent #1 is prepared into cement paste using P.O42.5 ordinary silicate cement at a water-cement ratio of 1:1, with a paste specific gravity of 1.50; Reagent #1 is stored in the first storage tank (23); The No. 2 reagent is water glass with a modulus of 3.1 to 3.4 and a Baume degree of 400Be, and the slurry specific gravity is 1.

38. The No. 1 reagent and the No. 2 reagent are mixed in a weight ratio of 1:1 to form a high-admixture accelerator cement paste with an initial setting time of only 45 seconds. The No. 2 reagent is stored in the second slurry storage tank (30). S2, preparation by mixing: The volume ratio was calculated by converting the mass ratio to 1:

1. Based on the specific gravity of slurry of reagent #1 to reagent #2 of 1.50:1.38, the volume ratio was calculated to be 1.38:1.

50. Two preparation systems were formed by the first grouting pump (24) and the second grouting pump (29) to supply materials respectively. According to the parameters of the automatic flow recorder (4), the flow rates of reagent #1 and reagent #2 were adjusted by the speed controller of the grouting pump to control the flow rate ratio at 1.38:1.

50. S3, through the single liquid blocker set at the orifice of the grouting hole, the No. 1 reagent and the No. 2 reagent are mixed at the orifice, and the mixture is pressed into the reinforced foundation through the sleeve valve tube (12); S4, grouting is performed inside the hole through the sleeve valve tube (12).

2. The method for preparing and grouting a cement paste preparation system with high admixture of accelerator according to claim 1, characterized in that: A first density sensor (31) and a first grout flow sensor (32) are connected on the pipeline between the first grout storage tank (23) and the first grout pump (24). The first density sensor (31) and the first grout flow sensor (32) are electrically connected to the automatic recorder (4).

3. The method for preparing and grouting a cement paste preparation system with high admixture accelerator as described in claim 1, characterized in that: A first pressure gauge (33) and a first pressure sensor (34) are connected between the first slurry inlet branch pipe (25) and the three-way valve (26). The first pressure sensor (34) is electrically connected to the automatic recorder (4).

4. The method for preparing and grouting a cement paste preparation system with high admixture of accelerator according to claim 1, characterized in that: A control valve (16) is provided at the front end of the second slurry inlet branch pipe (28).

5. The method for preparing and grouting a cement paste preparation system with high admixture of accelerator according to claim 1, characterized in that: A second pressure gauge (35) and a second pressure sensor (36) are connected between the second grout inlet branch pipe (28) and the second grouting pump (29). The second pressure sensor (36) is electrically connected to the automatic recorder (4).

6. The method for preparing and grouting a cement paste preparation system with high admixture of accelerator according to claim 1, characterized in that: A second density sensor (37) and a second grout flow sensor (38) are connected on the pipeline between the second grouting pump (29) and the second grout storage tank (30). The second density sensor (37) and the second grout flow sensor (38) are electrically connected to the automatic recorder (4).

Images