Method for preparing a grouting material from shield muck

Abstract

The present application relates to the technical field of shield muck, and discloses a preparation method of shield muck forming grouting material, which comprises main material, grouting agent and additive agent, and the proportion of the main material, the grouting agent and the additive agent is (60-90):(10-30):(0.05-0.3) according to the component mass ratio; the main material comprises mud slurry formed by shield muck and sand material; the grouting agent comprises Portland cement, sulphoaluminate cement, mineral powder, gypsum, fly ash and stone powder; and the additive agent comprises water reducing agent and retarder; the mud slurry and the sand material are firstly stirred and mixed to form the main material, then the grouting agent and the additive agent are added into the main material, and the main material, the grouting agent and the additive agent are stirred and mixed uniformly to form the grouting material. In this way, the grouting material can be injected into the pipe wall interval between the pipe segment and the soil body, a solid structure with certain strength is generated, the adhesion and stability of the pipe segment and the surrounding soil body are improved, the stability of the tunnel structure is enhanced, water infiltration is prevented, and the disposal problem of shield muck is solved.

Description

Preparation method of grouting material for shield tunneling excavation Technical Field

[0001] This invention patent relates to the technical field of shield tunneling excavation soil, and more specifically, to a method for preparing grouting materials from shield tunneling excavation soil. Background Technology

[0002] In recent years, urban subway construction projects in my country have shown a rapid development trend. Currently, the main construction method for subways is the shield tunneling method, which has the advantages of not affecting ground and waterway traffic and effectively reducing noise pollution to the surrounding area. However, with the widespread application of the shield tunneling method, a large amount of excavated soil is discharged during the process, but this mud-like excavated soil is difficult to transport directly.

[0003] Currently, the common method in existing technologies is to wash out the medium and coarse sand from the tunnel boring machine (TBM) slurry and then press and filter the slurry into mud cakes for off-site transportation. However, off-site transportation of slurry leads to a series of increased engineering and economic costs, such as manpower and material resources, and urban dumping sites are mostly saturated. Therefore, the need to find other ways to dispose of TBM slag has become very urgent. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing grouting materials from tunnel boring machine (TBM) excavation, aiming to solve the problem of TBM excavation disposal in the prior art.

[0005] This invention is implemented as follows: a method for preparing grouting material from shield tunnel excavation soil includes a main material, a grouting agent, and an admixture. The ratio of the main material, grouting agent, and admixture by mass is (60~90):(10~30):(0.05~0.3). The main material includes mud and sand formed from shield tunnel excavation soil. The grouting agent includes ordinary silicate cement, sulfoaluminate cement, mineral powder, gypsum, fly ash, and stone powder. The admixture includes a water-reducing agent and a retarder.

[0006] The mud and sand are first stirred and mixed to form the main material. Then, grouting agent and additives are added to the main material and stirred and mixed evenly to form the grouting material.

[0007] Optionally, in the main materials, the ratio of mud to sand is (4~9):(1~6) by mass.

[0008] Optionally, the apparent density of the main material is not less than 1700 kg / m³. 3 .

[0009] Optionally, according to the component mass ratio, the grouting agent includes 10 to 40 parts of ordinary Portland cement, 1 to 15 parts of sulfoaluminate cement, 30 to 80 parts of mineral powder, 10 to 30 parts of gypsum, 1 to 30 parts of fly ash, and 1 to 10 parts of stone powder.

[0010] Optionally, the ordinary silicate cement is P•O42.5 grade cement, the sulfoaluminate cement has a grade greater than 425, the mineral powder is S95 mineral powder or S105 mineral powder, the fly ash is Class II F fly ash, the gypsum is desulfurized gypsum or anhydrite or hemihydrate gypsum, the fineness of the gypsum is not less than 270 mesh, and the stone powder is building stone powder or natural stone powder.

[0011] Optionally, the ratio of the water-reducing agent to the retarder is (6~9):(1~4) according to the component mass ratio.

[0012] Optionally, the water-reducing agent is a polycarboxylate high-efficiency water-reducing agent, a naphthalene-based high-efficiency water-reducing agent, or a melamine high-efficiency water-reducing agent.

[0013] Optionally, the retarder is sucrose, sodium gluconate, or sodium hexametaphosphate.

[0014] Optionally, a mixer is provided, the mixer including a chamber having a cavity, the cavity having a partition dividing it into a dust collection cavity and a mixing cavity, the dust collection cavity being located above the partition and the mixing cavity being located below the partition;

[0015] The partition has a through-hole, and an upper filter screen is installed in the through-hole; an exhaust pipe is provided outside the dust collection chamber, the inner end of the exhaust pipe is connected to the dust collection chamber, an exhaust fan is provided in the middle of the exhaust pipe, and an exhaust port is formed at the outer end of the exhaust pipe.

[0016] The mixing chamber is provided with a longitudinally arranged mixing shaft, and the mixing shaft is provided with multiple mixing blades; the outer periphery of the mixing chamber is provided with multiple feed inlets, the feed inlets are connected to the mixing chamber, and the inner sidewall of the mixing chamber is provided with an inclined feed baffle, the upper end of the feed baffle is located above the feed inlet and is hinged to the inner sidewall of the mixing chamber, and the lower end of the feed baffle extends to the bottom of the feed inlet;

[0017] When the feeding plate is in its natural state, there is a lower end gap between the lower end of the feeding plate and the inner sidewall of the mixing chamber, and the feeding port is in the open state; the main material, grouting agent and additives are added into the mixing chamber through the feeding port, and the mixing is carried out by rotating the mixing shaft, and the main material, grouting agent and additives are mixed to form grouting material;

[0018] During the process of the stirring shaft rotating and stirring the grouting material, the feeding swing plate is subjected to radial impact from the grouting material, and the lower end of the feeding swing plate swings toward the inner wall of the stirring chamber to reduce the gap at the lower end.

[0019] During the process of the stirring shaft rotating and stirring the grouting material, the exhaust fan is started, and the internal air in the stirring chamber is drawn out through the exhaust pipe. The internal air is filtered through the upper filter screen and then discharged to the outside through the exhaust pipe. External air enters the stirring chamber through the lower end spacer.

[0020] Optionally, the two sides of the feeding baffle plate are respectively provided with side walls protruding towards the inner wall of the mixing chamber, and the lower end of the feeding baffle plate extends downward to form an outer inclined wall. Along the top-to-bottom direction, the outer inclined wall is arranged inclined towards the inner wall of the mixing chamber.

[0021] When the feeding plate is in its natural state, there is a side gap between the side wall and the inner wall of the mixing chamber, and the lower gap is formed between the outer inclined wall and the inner wall of the mixing chamber. During the process of the mixing shaft rotating and mixing the grouting material, the side wall abuts against the inner wall of the mixing chamber, and the outer inclined wall swings toward the inner wall of the mixing chamber, reducing the lower gap.

[0022] Compared with the prior art, the grouting method for forming grouting material from shield tunneling excavation provided by the present invention mixes the mud and sand formed from shield tunneling excavation with grouting extruders and additives to form grouting material. The grouting material can be injected into the gap between the tunnel segments and the soil to generate a solid structure with a certain strength, improve the bonding force and stability between the tunnel segments and the surrounding soil, enhance the stability of the tunnel structure, prevent water infiltration, and also solve the problem of shield tunneling excavation disposal. Attached Figure Description

[0023] Figure 1 is a cross-sectional schematic diagram of the hopper body provided by the present invention;

[0024] Figure 2 is a cross-sectional schematic diagram of the feeding tray provided by the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0027] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] Referring to Figures 1-2, a preferred embodiment of the present invention is provided.

[0029] The present invention provides a method for preparing grouting material from shield tunnel excavation, comprising main materials, grouting agent and admixtures, wherein the ratio of main materials, grouting agent and admixtures by mass is (60~90):(10~30):(0.05~0.3); the main materials include mud and sand formed from shield tunnel excavation, the grouting agent includes ordinary silicate cement, sulfoaluminate cement, mineral powder, gypsum, fly ash and stone powder, and the admixtures include water-reducing agent and retarder;

[0030] The mud and sand are first mixed to form the main material. Then, grouting agent and additives are added to the main material and mixed evenly to form the grouting material.

[0031] The above-mentioned method for mixing and grouting grouting materials formed from shield tunneling excavation soil mixes mud and sand with grouting extruders and additives to form grouting materials. The grouting materials can be injected into the gaps between the tunnel segments and the soil to generate a solid structure of a certain strength, improve the bonding force and stability between the tunnel segments and the surrounding soil, enhance the stability of the tunnel structure, prevent water infiltration, and solve the problem of shield tunneling excavation soil disposal.

[0032] Specifically, in the main materials, the ratio of mud to sand is (4~9):(1~6) according to the mass ratio.

[0033] Specifically, the apparent density of the main material shall not be less than 1700 kg / m³. 3 .

[0034] Specifically, according to the component mass ratio, the grouting agent includes 10 to 40 parts of ordinary Portland cement, 1 to 15 parts of sulfoaluminate cement, 30 to 80 parts of mineral powder, 10 to 30 parts of gypsum, 1 to 30 parts of fly ash, and 1 to 10 parts of stone powder.

[0035] Specifically, ordinary Portland cement is P•O42.5 grade cement, sulfoaluminate cement has a grade greater than 425, mineral powder is S95 mineral powder or S105 mineral powder, fly ash is grade II F fly ash, gypsum is desulfurized gypsum or anhydrite or hemihydrate gypsum with a fineness of not less than 270 mesh, and stone powder is building stone powder or natural stone powder.

[0036] According to the component mass ratio, the ratio of water-reducing agent to retarder is (6~9):(1~4).

[0037] In a preferred embodiment, the water-reducing agent is a polycarboxylate high-efficiency water-reducing agent, a naphthalene-based high-efficiency water-reducing agent, or a melamine high-efficiency water-reducing agent.

[0038] Specifically, the retarder is sucrose, sodium gluconate, or sodium hexametaphosphate.

[0039] In this embodiment, a mixer is provided, which includes a chamber 100, a chamber cavity in which a partition 110 is provided, the partition 110 dividing the chamber cavity into a dust collection chamber 101 and a mixing chamber 102, the dust collection chamber 101 being located above the partition 110 and the mixing chamber 102 being located below the partition 110.

[0040] The partition 110 has a through-hole, and an upper filter screen 111 is installed in the through-hole; the dust collection chamber 101 is provided with an exhaust pipe 200 outside, the inner end of the exhaust pipe 200 is connected to the dust collection chamber 101, the exhaust fan 210 is provided in the middle of the exhaust pipe 200, and the outer end of the exhaust pipe 200 forms an exhaust port.

[0041] The mixing chamber 102 is provided with a longitudinally arranged mixing shaft 120, and a plurality of mixing blades 121 are provided on the mixing shaft 120. A plurality of feed inlets 103 are provided on the outer periphery of the mixing chamber 102, and the feed inlets 103 are connected to the mixing chamber 102. An inclined feed baffle 130 is provided on the inner side wall of the mixing chamber 102. The upper end of the feed baffle 130 is located above the feed inlet 103 and is hinged to the inner side wall of the mixing chamber 102. The lower end of the feed baffle 130 extends to the bottom of the feed inlet 103.

[0042] When the feeding plate 130 is in its natural state, there is a lower end gap between the lower end of the feeding plate 130 and the inner side wall of the mixing chamber 102, and the feeding port 103 is in the open state; the main material, grouting agent and additives are added into the mixing chamber 102 through the feeding port 103, and the mixing is carried out by the rotation of the mixing shaft 120, and the main material, grouting agent and additives are mixed to form grouting material;

[0043] During the process of rotating and mixing the grouting material, the feeding baffle 130 is subjected to radial impact from the grouting material. The lower end of the feeding baffle 130 swings toward the inner wall of the mixing chamber 102 to reduce the gap at the lower end.

[0044] During the rotation of the mixing shaft 120 and the mixing of the grouting material, the exhaust fan 210 is activated, drawing in internal air from the mixing chamber 102 through the exhaust pipe 200. This internal air is filtered through the upper filter screen 111 and then discharged to the outside through the exhaust pipe 200. External air enters the mixing chamber 102 through the lower end gap. In this way, the exhaust pipe 200 draws small, lightweight dust particles from the mixing chamber 102 through the upper filter screen 111 to the dust collection chamber 101, and then discharges them through the exhaust port, improving the quality of the grouting material and resulting in a stronger solidified mass.

[0045] The two sides of the feeding plate 130 are respectively provided with side walls 131 protruding towards the inner wall of the mixing chamber 102. The lower end of the feeding plate 130 extends downward to form an outer inclined wall 132. Along the direction from top to bottom, the outer inclined wall 132 is arranged inclined towards the inner wall of the mixing chamber 102.

[0046] When the feeding plate 130 is in its natural state, there is a lateral gap between the side wall 131 and the inner wall of the mixing chamber 102, and a lower gap is formed between the outer inclined wall 132 and the inner wall of the mixing chamber 102. During the rotation of the mixing shaft 120 to mix the grouting material, the side wall 131 abuts against the inner wall of the mixing chamber 102, and the outer inclined wall 132 swings toward the inner wall of the mixing chamber 102, reducing the lower gap. In this way, during the feeding stage, the grout is fed quickly through the lower gap, and during the mixing process, uniform mixing is ensured by reducing the lower gap.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing grouting material from shield tunnel excavation, characterized in that, The material comprises a main material, a grouting agent, and admixtures. The ratio of the main material, grouting agent, and admixtures by mass is (60~90):(10~30):(0.05~0.3). The main material includes slurry formed from tunnel boring machine excavation and sand. The grouting agent includes ordinary silicate cement, sulfoaluminate cement, mineral powder, gypsum, fly ash, and stone powder. The admixtures include water-reducing agents and retarders. The slurry and sand are first mixed to form the main material. Then, the grouting agent and admixtures are added to the main material, and the main material, grouting agent, and admixtures are mixed evenly to form the grouting material. A mixer is provided, comprising a chamber with a cavity. A partition divides the cavity into a dust collection chamber and a mixing chamber. The dust collection chamber is located above the partition, and the mixing chamber is located below it. The partition has a through-hole with an upper filter screen. An exhaust pipe is provided outside the dust collection chamber, its inner end connecting to the chamber. An exhaust fan is located in the middle of the pipe, and its outer end forms an exhaust port. A longitudinally arranged mixing shaft with multiple mixing blades is provided in the mixing chamber. Multiple feed inlets are located on the outer periphery of the mixing chamber, connecting to it. An inclined feed vane is located on the inner wall of the mixing chamber, its upper end positioned above the feed inlets and hinged to the inner wall of the mixing chamber. The lower end extends below the feed inlet; when the feed plate is in its natural state, there is a lower end gap between the lower end of the feed plate and the inner wall of the mixing chamber, and the feed inlet is in the open state; the main material, grouting agent, and additives are added into the mixing chamber through the feed inlet, and stirred by the rotation of the stirring shaft, the main material, grouting agent, and additives are stirred and mixed to form grouting material; during the rotation of the stirring shaft to stir the grouting material, the feed plate is subjected to radial impact of the grouting material, and the lower end of the feed plate swings toward the inner wall of the mixing chamber to reduce the lower end gap; during the rotation of the stirring shaft to stir the grouting material, the exhaust fan is started, and the internal air in the mixing chamber is drawn out through the exhaust pipe. The internal air is filtered through the upper filter screen and discharged to the outside through the exhaust pipe, and the external air enters the mixing chamber through the lower end gap.

2. The method for preparing grouting material from shield tunneling excavation soil as described in claim 1, characterized in that, In the main materials, the ratio of mud to sand is (4~9):(1~6) by mass.

3. The method for preparing grouting material from shield tunneling excavation soil as described in claim 1, characterized in that, The apparent density of the main material is not less than 1700 kg / m³. 3 .

4. The method for preparing grouting material from shield tunneling excavation soil as described in claim 1, characterized in that, According to the component mass ratio, the grouting agent includes 10 to 40 parts of ordinary silicate cement, 1 to 15 parts of sulfoaluminate cement, 30 to 80 parts of mineral powder, 10 to 30 parts of gypsum, 1 to 30 parts of fly ash, and 1 to 10 parts of stone powder.

5. The method for preparing grouting material from shield tunneling excavation soil as described in claim 1, characterized in that, The ordinary silicate cement is P•O42.5 grade cement, the grade of the sulfoaluminate cement is greater than 425, the mineral powder is S95 mineral powder or S105 mineral powder, the fly ash is Class II F fly ash, the gypsum is desulfurized gypsum or anhydrite or hemihydrate gypsum, the fineness of the gypsum is not less than 270 mesh, and the stone powder is building stone powder or natural stone powder.

6. The method for preparing grouting material from shield tunneling excavation soil as described in claim 1, characterized in that, According to the component mass ratio, the ratio of the water-reducing agent and the retarder is (6~9):(1~4).

7. The method for preparing grouting material from shield tunneling excavation soil as described in claim 1, characterized in that, The water-reducing agent is a polycarboxylate high-efficiency water-reducing agent, a naphthalene-based high-efficiency water-reducing agent, or a melamine high-efficiency water-reducing agent.

8. The method for preparing grouting material from shield tunneling excavation soil as described in claim 1, characterized in that, The retarder is sucrose, sodium gluconate, or sodium hexametaphosphate.

9. The method for preparing grouting material for shield tunneling excavation as described in any one of claims 1 to 8, characterized in that, The feeding baffle plate has sidewalls protruding from both sides toward the inner wall of the mixing chamber. The lower end of the feeding baffle plate extends downward to form an outer inclined wall. Along the top-to-bottom direction, the outer inclined wall is inclined toward the inner wall of the mixing chamber. When the feeding baffle plate is in its natural state, there is a side gap between the sidewall and the inner wall of the mixing chamber, and the lower gap is formed between the outer inclined wall and the inner wall of the mixing chamber. During the process of the mixing shaft rotating and mixing the grouting material, the sidewall abuts against the inner wall of the mixing chamber, and the outer inclined wall swings toward the inner wall of the mixing chamber, reducing the lower gap.

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